Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2002 Intel Corp. | |
6 | * Copyright (c) 2002 Nokia Corp. | |
7 | * | |
60c778b2 | 8 | * This is part of the SCTP Linux Kernel Implementation. |
1da177e4 LT |
9 | * |
10 | * These are the state functions for the state machine. | |
11 | * | |
60c778b2 | 12 | * This SCTP implementation is free software; |
1da177e4 LT |
13 | * you can redistribute it and/or modify it under the terms of |
14 | * the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
20 | * ************************ | |
21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
22 | * See the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
25 | * along with GNU CC; see the file COPYING. If not, see |
26 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
27 | * |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * Written or modified by: |
33 | * La Monte H.P. Yarroll <piggy@acm.org> | |
34 | * Karl Knutson <karl@athena.chicago.il.us> | |
35 | * Mathew Kotowsky <kotowsky@sctp.org> | |
36 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
37 | * Jon Grimm <jgrimm@us.ibm.com> | |
38 | * Hui Huang <hui.huang@nokia.com> | |
39 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
40 | * Daisy Chang <daisyc@us.ibm.com> | |
41 | * Ardelle Fan <ardelle.fan@intel.com> | |
42 | * Ryan Layer <rmlayer@us.ibm.com> | |
43 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
44 | */ |
45 | ||
145ce502 JP |
46 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
47 | ||
1da177e4 LT |
48 | #include <linux/types.h> |
49 | #include <linux/kernel.h> | |
50 | #include <linux/ip.h> | |
51 | #include <linux/ipv6.h> | |
52 | #include <linux/net.h> | |
53 | #include <linux/inet.h> | |
5a0e3ad6 | 54 | #include <linux/slab.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/inet_ecn.h> | |
57 | #include <linux/skbuff.h> | |
58 | #include <net/sctp/sctp.h> | |
59 | #include <net/sctp/sm.h> | |
60 | #include <net/sctp/structs.h> | |
61 | ||
172a1599 XL |
62 | static struct sctp_packet *sctp_abort_pkt_new( |
63 | struct net *net, | |
64 | const struct sctp_endpoint *ep, | |
65 | const struct sctp_association *asoc, | |
66 | struct sctp_chunk *chunk, | |
67 | const void *payload, size_t paylen); | |
1da177e4 LT |
68 | static int sctp_eat_data(const struct sctp_association *asoc, |
69 | struct sctp_chunk *chunk, | |
a85bbeb2 | 70 | struct sctp_cmd_seq *commands); |
172a1599 XL |
71 | static struct sctp_packet *sctp_ootb_pkt_new( |
72 | struct net *net, | |
73 | const struct sctp_association *asoc, | |
74 | const struct sctp_chunk *chunk); | |
24cb81a6 EB |
75 | static void sctp_send_stale_cookie_err(struct net *net, |
76 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
77 | const struct sctp_association *asoc, |
78 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 79 | struct sctp_cmd_seq *commands, |
1da177e4 | 80 | struct sctp_chunk *err_chunk); |
172a1599 XL |
81 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
82 | struct net *net, | |
83 | const struct sctp_endpoint *ep, | |
84 | const struct sctp_association *asoc, | |
85 | const union sctp_subtype type, | |
86 | void *arg, | |
87 | struct sctp_cmd_seq *commands); | |
88 | static enum sctp_disposition sctp_sf_shut_8_4_5( | |
89 | struct net *net, | |
90 | const struct sctp_endpoint *ep, | |
91 | const struct sctp_association *asoc, | |
92 | const union sctp_subtype type, | |
93 | void *arg, | |
94 | struct sctp_cmd_seq *commands); | |
95 | static enum sctp_disposition sctp_sf_tabort_8_4_8( | |
96 | struct net *net, | |
24cb81a6 | 97 | const struct sctp_endpoint *ep, |
ece25dfa | 98 | const struct sctp_association *asoc, |
bfc6f827 | 99 | const union sctp_subtype type, |
ece25dfa | 100 | void *arg, |
a85bbeb2 | 101 | struct sctp_cmd_seq *commands); |
1da177e4 LT |
102 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk); |
103 | ||
172a1599 XL |
104 | static enum sctp_disposition sctp_stop_t1_and_abort( |
105 | struct net *net, | |
106 | struct sctp_cmd_seq *commands, | |
107 | __be16 error, int sk_err, | |
108 | const struct sctp_association *asoc, | |
109 | struct sctp_transport *transport); | |
52c1da39 | 110 | |
172a1599 XL |
111 | static enum sctp_disposition sctp_sf_abort_violation( |
112 | struct net *net, | |
113 | const struct sctp_endpoint *ep, | |
114 | const struct sctp_association *asoc, | |
115 | void *arg, | |
116 | struct sctp_cmd_seq *commands, | |
117 | const __u8 *payload, | |
118 | const size_t paylen); | |
aecedeab | 119 | |
172a1599 XL |
120 | static enum sctp_disposition sctp_sf_violation_chunklen( |
121 | struct net *net, | |
122 | const struct sctp_endpoint *ep, | |
123 | const struct sctp_association *asoc, | |
124 | const union sctp_subtype type, | |
125 | void *arg, | |
126 | struct sctp_cmd_seq *commands); | |
1da177e4 | 127 | |
172a1599 XL |
128 | static enum sctp_disposition sctp_sf_violation_paramlen( |
129 | struct net *net, | |
130 | const struct sctp_endpoint *ep, | |
131 | const struct sctp_association *asoc, | |
132 | const union sctp_subtype type, | |
133 | void *arg, void *ext, | |
134 | struct sctp_cmd_seq *commands); | |
6f4c618d | 135 | |
172a1599 XL |
136 | static enum sctp_disposition sctp_sf_violation_ctsn( |
137 | struct net *net, | |
138 | const struct sctp_endpoint *ep, | |
139 | const struct sctp_association *asoc, | |
140 | const union sctp_subtype type, | |
141 | void *arg, | |
142 | struct sctp_cmd_seq *commands); | |
aecedeab | 143 | |
172a1599 XL |
144 | static enum sctp_disposition sctp_sf_violation_chunk( |
145 | struct net *net, | |
146 | const struct sctp_endpoint *ep, | |
147 | const struct sctp_association *asoc, | |
148 | const union sctp_subtype type, | |
149 | void *arg, | |
150 | struct sctp_cmd_seq *commands); | |
ece25dfa | 151 | |
4785c7ae | 152 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 153 | const struct sctp_association *asoc, |
172a1599 | 154 | struct sctp_chunk *chunk); |
bbd0d598 | 155 | |
172a1599 XL |
156 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
157 | struct net *net, | |
24cb81a6 | 158 | const struct sctp_endpoint *ep, |
75205f47 | 159 | const struct sctp_association *asoc, |
bfc6f827 | 160 | const union sctp_subtype type, |
75205f47 | 161 | void *arg, |
a85bbeb2 | 162 | struct sctp_cmd_seq *commands); |
75205f47 | 163 | |
1da177e4 LT |
164 | /* Small helper function that checks if the chunk length |
165 | * is of the appropriate length. The 'required_length' argument | |
166 | * is set to be the size of a specific chunk we are testing. | |
509e7a31 MRL |
167 | * Return Values: true = Valid length |
168 | * false = Invalid length | |
1da177e4 LT |
169 | * |
170 | */ | |
172a1599 XL |
171 | static inline bool sctp_chunk_length_valid(struct sctp_chunk *chunk, |
172 | __u16 required_length) | |
1da177e4 LT |
173 | { |
174 | __u16 chunk_length = ntohs(chunk->chunk_hdr->length); | |
175 | ||
26b87c78 DB |
176 | /* Previously already marked? */ |
177 | if (unlikely(chunk->pdiscard)) | |
509e7a31 | 178 | return false; |
1da177e4 | 179 | if (unlikely(chunk_length < required_length)) |
509e7a31 | 180 | return false; |
1da177e4 | 181 | |
509e7a31 | 182 | return true; |
1da177e4 LT |
183 | } |
184 | ||
185 | /********************************************************** | |
186 | * These are the state functions for handling chunk events. | |
187 | **********************************************************/ | |
188 | ||
189 | /* | |
190 | * Process the final SHUTDOWN COMPLETE. | |
191 | * | |
192 | * Section: 4 (C) (diagram), 9.2 | |
193 | * Upon reception of the SHUTDOWN COMPLETE chunk the endpoint will verify | |
194 | * that it is in SHUTDOWN-ACK-SENT state, if it is not the chunk should be | |
195 | * discarded. If the endpoint is in the SHUTDOWN-ACK-SENT state the endpoint | |
196 | * should stop the T2-shutdown timer and remove all knowledge of the | |
197 | * association (and thus the association enters the CLOSED state). | |
198 | * | |
047a2428 | 199 | * Verification Tag: 8.5.1(C), sctpimpguide 2.41. |
1da177e4 LT |
200 | * C) Rules for packet carrying SHUTDOWN COMPLETE: |
201 | * ... | |
047a2428 JF |
202 | * - The receiver of a SHUTDOWN COMPLETE shall accept the packet |
203 | * if the Verification Tag field of the packet matches its own tag and | |
204 | * the T bit is not set | |
205 | * OR | |
206 | * it is set to its peer's tag and the T bit is set in the Chunk | |
207 | * Flags. | |
208 | * Otherwise, the receiver MUST silently discard the packet | |
209 | * and take no further action. An endpoint MUST ignore the | |
210 | * SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state. | |
1da177e4 LT |
211 | * |
212 | * Inputs | |
213 | * (endpoint, asoc, chunk) | |
214 | * | |
215 | * Outputs | |
216 | * (asoc, reply_msg, msg_up, timers, counters) | |
217 | * | |
218 | * The return value is the disposition of the chunk. | |
219 | */ | |
172a1599 XL |
220 | enum sctp_disposition sctp_sf_do_4_C(struct net *net, |
221 | const struct sctp_endpoint *ep, | |
222 | const struct sctp_association *asoc, | |
223 | const union sctp_subtype type, | |
224 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
225 | { |
226 | struct sctp_chunk *chunk = arg; | |
227 | struct sctp_ulpevent *ev; | |
228 | ||
ece25dfa | 229 | if (!sctp_vtag_verify_either(chunk, asoc)) |
24cb81a6 | 230 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
ece25dfa | 231 | |
1da177e4 LT |
232 | /* RFC 2960 6.10 Bundling |
233 | * | |
234 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
235 | * SHUTDOWN COMPLETE with any other chunks. | |
236 | */ | |
237 | if (!chunk->singleton) | |
24cb81a6 | 238 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 239 | |
ece25dfa | 240 | /* Make sure that the SHUTDOWN_COMPLETE chunk has a valid length. */ |
922dbc5b | 241 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 242 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 243 | commands); |
1da177e4 LT |
244 | |
245 | /* RFC 2960 10.2 SCTP-to-ULP | |
246 | * | |
247 | * H) SHUTDOWN COMPLETE notification | |
248 | * | |
249 | * When SCTP completes the shutdown procedures (section 9.2) this | |
250 | * notification is passed to the upper layer. | |
251 | */ | |
252 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 253 | 0, 0, 0, NULL, GFP_ATOMIC); |
df7deeb5 VY |
254 | if (ev) |
255 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
d808ad9a | 256 | SCTP_ULPEVENT(ev)); |
1da177e4 LT |
257 | |
258 | /* Upon reception of the SHUTDOWN COMPLETE chunk the endpoint | |
259 | * will verify that it is in SHUTDOWN-ACK-SENT state, if it is | |
260 | * not the chunk should be discarded. If the endpoint is in | |
261 | * the SHUTDOWN-ACK-SENT state the endpoint should stop the | |
262 | * T2-shutdown timer and remove all knowledge of the | |
263 | * association (and thus the association enters the CLOSED | |
264 | * state). | |
265 | */ | |
266 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
267 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
268 | ||
269 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
270 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
271 | ||
272 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
273 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
274 | ||
b01a2407 EB |
275 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
276 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
277 | |
278 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
279 | ||
280 | return SCTP_DISPOSITION_DELETE_TCB; | |
1da177e4 LT |
281 | } |
282 | ||
283 | /* | |
284 | * Respond to a normal INIT chunk. | |
285 | * We are the side that is being asked for an association. | |
286 | * | |
287 | * Section: 5.1 Normal Establishment of an Association, B | |
288 | * B) "Z" shall respond immediately with an INIT ACK chunk. The | |
289 | * destination IP address of the INIT ACK MUST be set to the source | |
290 | * IP address of the INIT to which this INIT ACK is responding. In | |
291 | * the response, besides filling in other parameters, "Z" must set the | |
292 | * Verification Tag field to Tag_A, and also provide its own | |
293 | * Verification Tag (Tag_Z) in the Initiate Tag field. | |
294 | * | |
d808ad9a | 295 | * Verification Tag: Must be 0. |
1da177e4 LT |
296 | * |
297 | * Inputs | |
298 | * (endpoint, asoc, chunk) | |
299 | * | |
300 | * Outputs | |
301 | * (asoc, reply_msg, msg_up, timers, counters) | |
302 | * | |
303 | * The return value is the disposition of the chunk. | |
304 | */ | |
172a1599 XL |
305 | enum sctp_disposition sctp_sf_do_5_1B_init(struct net *net, |
306 | const struct sctp_endpoint *ep, | |
307 | const struct sctp_association *asoc, | |
308 | const union sctp_subtype type, | |
309 | void *arg, | |
310 | struct sctp_cmd_seq *commands) | |
1da177e4 | 311 | { |
62e6b7e4 XL |
312 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
313 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 314 | struct sctp_association *new_asoc; |
1da177e4 | 315 | struct sctp_packet *packet; |
1da177e4 LT |
316 | int len; |
317 | ||
318 | /* 6.10 Bundling | |
319 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
320 | * SHUTDOWN COMPLETE with any other chunks. | |
d808ad9a | 321 | * |
1da177e4 LT |
322 | * IG Section 2.11.2 |
323 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
324 | * enforce these rules by silently discarding an arriving packet | |
325 | * with an INIT chunk that is bundled with other chunks. | |
326 | */ | |
327 | if (!chunk->singleton) | |
24cb81a6 | 328 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
329 | |
330 | /* If the packet is an OOTB packet which is temporarily on the | |
331 | * control endpoint, respond with an ABORT. | |
332 | */ | |
2ce95503 | 333 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 334 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 335 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 336 | } |
1da177e4 | 337 | |
1da177e4 | 338 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification |
d808ad9a | 339 | * Tag. |
1da177e4 LT |
340 | */ |
341 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 342 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
343 | |
344 | /* Make sure that the INIT chunk has a valid length. | |
345 | * Normally, this would cause an ABORT with a Protocol Violation | |
346 | * error, but since we don't have an association, we'll | |
347 | * just discard the packet. | |
348 | */ | |
01a992be | 349 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 350 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 351 | |
bec9640b VY |
352 | /* If the INIT is coming toward a closing socket, we'll send back |
353 | * and ABORT. Essentially, this catches the race of INIT being | |
354 | * backloged to the socket at the same time as the user isses close(). | |
355 | * Since the socket and all its associations are going away, we | |
356 | * can treat this OOTB | |
357 | */ | |
358 | if (sctp_sstate(ep->base.sk, CLOSING)) | |
24cb81a6 | 359 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
bec9640b | 360 | |
1da177e4 LT |
361 | /* Verify the INIT chunk before processing it. */ |
362 | err_chunk = NULL; | |
b14878cc | 363 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 364 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
365 | &err_chunk)) { |
366 | /* This chunk contains fatal error. It is to be discarded. | |
367 | * Send an ABORT, with causes if there is any. | |
368 | */ | |
369 | if (err_chunk) { | |
24cb81a6 | 370 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 371 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 372 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 373 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 374 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
375 | |
376 | sctp_chunk_free(err_chunk); | |
377 | ||
378 | if (packet) { | |
379 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
380 | SCTP_PACKET(packet)); | |
b01a2407 | 381 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
382 | return SCTP_DISPOSITION_CONSUME; |
383 | } else { | |
384 | return SCTP_DISPOSITION_NOMEM; | |
385 | } | |
386 | } else { | |
24cb81a6 | 387 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
388 | commands); |
389 | } | |
390 | } | |
391 | ||
d808ad9a | 392 | /* Grab the INIT header. */ |
4ae70c08 | 393 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
394 | |
395 | /* Tag the variable length parameters. */ | |
4ae70c08 | 396 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
397 | |
398 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
399 | if (!new_asoc) | |
400 | goto nomem; | |
401 | ||
409b95af VY |
402 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
403 | sctp_scope(sctp_source(chunk)), | |
404 | GFP_ATOMIC) < 0) | |
405 | goto nomem_init; | |
406 | ||
1da177e4 | 407 | /* The call, sctp_process_init(), can fail on memory allocation. */ |
de6becdc | 408 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 409 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
1da177e4 LT |
410 | GFP_ATOMIC)) |
411 | goto nomem_init; | |
412 | ||
1da177e4 LT |
413 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ |
414 | ||
415 | /* If there are errors need to be reported for unknown parameters, | |
416 | * make sure to reserve enough room in the INIT ACK for them. | |
417 | */ | |
418 | len = 0; | |
419 | if (err_chunk) | |
420 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 421 | sizeof(struct sctp_chunkhdr); |
1da177e4 | 422 | |
1da177e4 LT |
423 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
424 | if (!repl) | |
df7deeb5 | 425 | goto nomem_init; |
1da177e4 LT |
426 | |
427 | /* If there are errors need to be reported for unknown parameters, | |
428 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
429 | * parameter. | |
430 | */ | |
431 | if (err_chunk) { | |
432 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
433 | * ERROR chunk generated by sctp_verify_init(). Since the | |
434 | * error cause code for "unknown parameter" and the | |
435 | * "Unrecognized parameter" type is the same, we can | |
436 | * construct the parameters in INIT ACK by copying the | |
437 | * ERROR causes over. | |
438 | */ | |
62e6b7e4 | 439 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 440 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 441 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
442 | /* Replace the cause code with the "Unrecognized parameter" |
443 | * parameter type. | |
444 | */ | |
445 | sctp_addto_chunk(repl, len, unk_param); | |
446 | sctp_chunk_free(err_chunk); | |
447 | } | |
448 | ||
df7deeb5 VY |
449 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); |
450 | ||
1da177e4 LT |
451 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
452 | ||
453 | /* | |
454 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
455 | * "Z" MUST NOT allocate any resources, nor keep any states for the | |
456 | * new association. Otherwise, "Z" will be vulnerable to resource | |
457 | * attacks. | |
458 | */ | |
459 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
460 | ||
461 | return SCTP_DISPOSITION_DELETE_TCB; | |
462 | ||
1da177e4 LT |
463 | nomem_init: |
464 | sctp_association_free(new_asoc); | |
465 | nomem: | |
df7deeb5 VY |
466 | if (err_chunk) |
467 | sctp_chunk_free(err_chunk); | |
1da177e4 LT |
468 | return SCTP_DISPOSITION_NOMEM; |
469 | } | |
470 | ||
471 | /* | |
472 | * Respond to a normal INIT ACK chunk. | |
473 | * We are the side that is initiating the association. | |
474 | * | |
475 | * Section: 5.1 Normal Establishment of an Association, C | |
476 | * C) Upon reception of the INIT ACK from "Z", "A" shall stop the T1-init | |
477 | * timer and leave COOKIE-WAIT state. "A" shall then send the State | |
478 | * Cookie received in the INIT ACK chunk in a COOKIE ECHO chunk, start | |
479 | * the T1-cookie timer, and enter the COOKIE-ECHOED state. | |
480 | * | |
481 | * Note: The COOKIE ECHO chunk can be bundled with any pending outbound | |
482 | * DATA chunks, but it MUST be the first chunk in the packet and | |
483 | * until the COOKIE ACK is returned the sender MUST NOT send any | |
484 | * other packets to the peer. | |
485 | * | |
486 | * Verification Tag: 3.3.3 | |
487 | * If the value of the Initiate Tag in a received INIT ACK chunk is | |
488 | * found to be 0, the receiver MUST treat it as an error and close the | |
489 | * association by transmitting an ABORT. | |
490 | * | |
491 | * Inputs | |
492 | * (endpoint, asoc, chunk) | |
493 | * | |
494 | * Outputs | |
495 | * (asoc, reply_msg, msg_up, timers, counters) | |
496 | * | |
497 | * The return value is the disposition of the chunk. | |
498 | */ | |
172a1599 XL |
499 | enum sctp_disposition sctp_sf_do_5_1C_ack(struct net *net, |
500 | const struct sctp_endpoint *ep, | |
501 | const struct sctp_association *asoc, | |
502 | const union sctp_subtype type, | |
503 | void *arg, | |
504 | struct sctp_cmd_seq *commands) | |
1da177e4 | 505 | { |
01a992be | 506 | struct sctp_init_chunk *initchunk; |
172a1599 | 507 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
508 | struct sctp_chunk *err_chunk; |
509 | struct sctp_packet *packet; | |
1da177e4 LT |
510 | |
511 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 512 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 513 | |
1da177e4 LT |
514 | /* 6.10 Bundling |
515 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
516 | * SHUTDOWN COMPLETE with any other chunks. | |
517 | */ | |
518 | if (!chunk->singleton) | |
24cb81a6 | 519 | return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands); |
1da177e4 | 520 | |
ece25dfa | 521 | /* Make sure that the INIT-ACK chunk has a valid length */ |
cb1844c4 | 522 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk))) |
24cb81a6 | 523 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 524 | commands); |
1da177e4 | 525 | /* Grab the INIT header. */ |
4ae70c08 | 526 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 | 527 | |
1da177e4 LT |
528 | /* Verify the INIT chunk before processing it. */ |
529 | err_chunk = NULL; | |
b14878cc | 530 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 531 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
532 | &err_chunk)) { |
533 | ||
2a493216 | 534 | enum sctp_error error = SCTP_ERROR_NO_RESOURCE; |
853f4b50 | 535 | |
1da177e4 | 536 | /* This chunk contains fatal error. It is to be discarded. |
d6701191 VY |
537 | * Send an ABORT, with causes. If there are no causes, |
538 | * then there wasn't enough memory. Just terminate | |
539 | * the association. | |
1da177e4 LT |
540 | */ |
541 | if (err_chunk) { | |
24cb81a6 | 542 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 543 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 544 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 545 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 546 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
547 | |
548 | sctp_chunk_free(err_chunk); | |
549 | ||
550 | if (packet) { | |
551 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
552 | SCTP_PACKET(packet)); | |
24cb81a6 | 553 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
8de8c873 | 554 | error = SCTP_ERROR_INV_PARAM; |
1da177e4 | 555 | } |
1da177e4 | 556 | } |
bbd0d598 VY |
557 | |
558 | /* SCTP-AUTH, Section 6.3: | |
559 | * It should be noted that if the receiver wants to tear | |
560 | * down an association in an authenticated way only, the | |
561 | * handling of malformed packets should not result in | |
562 | * tearing down the association. | |
563 | * | |
564 | * This means that if we only want to abort associations | |
565 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 566 | * can't destroy this association just because the packet |
bbd0d598 VY |
567 | * was malformed. |
568 | */ | |
569 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
24cb81a6 | 570 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 | 571 | |
24cb81a6 EB |
572 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
573 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, | |
8de8c873 | 574 | asoc, chunk->transport); |
1da177e4 LT |
575 | } |
576 | ||
577 | /* Tag the variable length parameters. Note that we never | |
578 | * convert the parameters in an INIT chunk. | |
579 | */ | |
4ae70c08 | 580 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 | 581 | |
01a992be | 582 | initchunk = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
583 | |
584 | sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT, | |
585 | SCTP_PEER_INIT(initchunk)); | |
586 | ||
3f7a87d2 FF |
587 | /* Reset init error count upon receipt of INIT-ACK. */ |
588 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); | |
589 | ||
1da177e4 LT |
590 | /* 5.1 C) "A" shall stop the T1-init timer and leave |
591 | * COOKIE-WAIT state. "A" shall then ... start the T1-cookie | |
592 | * timer, and enter the COOKIE-ECHOED state. | |
593 | */ | |
594 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
595 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
596 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
597 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
598 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
599 | SCTP_STATE(SCTP_STATE_COOKIE_ECHOED)); | |
600 | ||
730fc3d0 VY |
601 | /* SCTP-AUTH: genereate the assocition shared keys so that |
602 | * we can potentially signe the COOKIE-ECHO. | |
603 | */ | |
604 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_SHKEY, SCTP_NULL()); | |
605 | ||
1da177e4 LT |
606 | /* 5.1 C) "A" shall then send the State Cookie received in the |
607 | * INIT ACK chunk in a COOKIE ECHO chunk, ... | |
608 | */ | |
609 | /* If there is any errors to report, send the ERROR chunk generated | |
610 | * for unknown parameters as well. | |
611 | */ | |
612 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_COOKIE_ECHO, | |
613 | SCTP_CHUNK(err_chunk)); | |
614 | ||
615 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
616 | } |
617 | ||
3b54f1fd XL |
618 | static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, |
619 | const struct sctp_association *asoc) | |
620 | { | |
621 | struct sctp_chunk auth; | |
622 | ||
623 | if (!chunk->auth_chunk) | |
624 | return true; | |
625 | ||
626 | /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo | |
627 | * is supposed to be authenticated and we have to do delayed | |
628 | * authentication. We've just recreated the association using | |
629 | * the information in the cookie and now it's much easier to | |
630 | * do the authentication. | |
631 | */ | |
632 | ||
633 | /* Make sure that we and the peer are AUTH capable */ | |
634 | if (!net->sctp.auth_enable || !asoc->peer.auth_capable) | |
635 | return false; | |
636 | ||
637 | /* set-up our fake chunk so that we can process it */ | |
638 | auth.skb = chunk->auth_chunk; | |
639 | auth.asoc = chunk->asoc; | |
640 | auth.sctp_hdr = chunk->sctp_hdr; | |
641 | auth.chunk_hdr = (struct sctp_chunkhdr *) | |
642 | skb_push(chunk->auth_chunk, | |
643 | sizeof(struct sctp_chunkhdr)); | |
644 | skb_pull(chunk->auth_chunk, sizeof(struct sctp_chunkhdr)); | |
645 | auth.transport = chunk->transport; | |
646 | ||
647 | return sctp_sf_authenticate(asoc, &auth) == SCTP_IERROR_NO_ERROR; | |
648 | } | |
649 | ||
1da177e4 LT |
650 | /* |
651 | * Respond to a normal COOKIE ECHO chunk. | |
652 | * We are the side that is being asked for an association. | |
653 | * | |
654 | * Section: 5.1 Normal Establishment of an Association, D | |
655 | * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply | |
656 | * with a COOKIE ACK chunk after building a TCB and moving to | |
657 | * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with | |
658 | * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK | |
659 | * chunk MUST be the first chunk in the packet. | |
660 | * | |
661 | * IMPLEMENTATION NOTE: An implementation may choose to send the | |
662 | * Communication Up notification to the SCTP user upon reception | |
663 | * of a valid COOKIE ECHO chunk. | |
664 | * | |
665 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
666 | * D) Rules for packet carrying a COOKIE ECHO | |
667 | * | |
668 | * - When sending a COOKIE ECHO, the endpoint MUST use the value of the | |
669 | * Initial Tag received in the INIT ACK. | |
670 | * | |
671 | * - The receiver of a COOKIE ECHO follows the procedures in Section 5. | |
672 | * | |
673 | * Inputs | |
674 | * (endpoint, asoc, chunk) | |
675 | * | |
676 | * Outputs | |
677 | * (asoc, reply_msg, msg_up, timers, counters) | |
678 | * | |
679 | * The return value is the disposition of the chunk. | |
680 | */ | |
172a1599 XL |
681 | enum sctp_disposition sctp_sf_do_5_1D_ce(struct net *net, |
682 | const struct sctp_endpoint *ep, | |
683 | const struct sctp_association *asoc, | |
684 | const union sctp_subtype type, | |
685 | void *arg, | |
686 | struct sctp_cmd_seq *commands) | |
1da177e4 | 687 | { |
172a1599 | 688 | struct sctp_ulpevent *ev, *ai_ev = NULL; |
1da177e4 | 689 | struct sctp_association *new_asoc; |
01a992be | 690 | struct sctp_init_chunk *peer_init; |
172a1599 | 691 | struct sctp_chunk *chunk = arg; |
1da177e4 | 692 | struct sctp_chunk *err_chk_p; |
172a1599 | 693 | struct sctp_chunk *repl; |
609ee467 | 694 | struct sock *sk; |
172a1599 | 695 | int error = 0; |
1da177e4 LT |
696 | |
697 | /* If the packet is an OOTB packet which is temporarily on the | |
698 | * control endpoint, respond with an ABORT. | |
699 | */ | |
2ce95503 | 700 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { |
b01a2407 | 701 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
24cb81a6 | 702 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
8190f89d | 703 | } |
1da177e4 LT |
704 | |
705 | /* Make sure that the COOKIE_ECHO chunk has a valid length. | |
706 | * In this case, we check that we have enough for at least a | |
707 | * chunk header. More detailed verification is done | |
708 | * in sctp_unpack_cookie(). | |
709 | */ | |
922dbc5b | 710 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 711 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 712 | |
609ee467 VY |
713 | /* If the endpoint is not listening or if the number of associations |
714 | * on the TCP-style socket exceed the max backlog, respond with an | |
715 | * ABORT. | |
716 | */ | |
717 | sk = ep->base.sk; | |
718 | if (!sctp_sstate(sk, LISTENING) || | |
719 | (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) | |
24cb81a6 | 720 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
609ee467 | 721 | |
1da177e4 LT |
722 | /* "Decode" the chunk. We have no optional parameters so we |
723 | * are in good shape. | |
724 | */ | |
d808ad9a | 725 | chunk->subh.cookie_hdr = |
1da177e4 | 726 | (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 727 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 728 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 729 | goto nomem; |
1da177e4 LT |
730 | |
731 | /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint | |
732 | * "Z" will reply with a COOKIE ACK chunk after building a TCB | |
733 | * and moving to the ESTABLISHED state. | |
734 | */ | |
735 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
736 | &err_chk_p); | |
737 | ||
738 | /* FIXME: | |
739 | * If the re-build failed, what is the proper error path | |
740 | * from here? | |
741 | * | |
742 | * [We should abort the association. --piggy] | |
743 | */ | |
744 | if (!new_asoc) { | |
745 | /* FIXME: Several errors are possible. A bad cookie should | |
746 | * be silently discarded, but think about logging it too. | |
747 | */ | |
748 | switch (error) { | |
749 | case -SCTP_IERROR_NOMEM: | |
750 | goto nomem; | |
751 | ||
752 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 753 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 754 | err_chk_p); |
24cb81a6 | 755 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
756 | |
757 | case -SCTP_IERROR_BAD_SIG: | |
758 | default: | |
24cb81a6 | 759 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 760 | } |
1da177e4 LT |
761 | } |
762 | ||
1da177e4 | 763 | |
df7deeb5 VY |
764 | /* Delay state machine commands until later. |
765 | * | |
766 | * Re-build the bind address for the association is done in | |
1da177e4 LT |
767 | * the sctp_unpack_cookie() already. |
768 | */ | |
769 | /* This is a brand-new association, so these are not yet side | |
770 | * effects--it is safe to run them here. | |
771 | */ | |
772 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
773 | ||
de6becdc | 774 | if (!sctp_process_init(new_asoc, chunk, |
6a1e5f33 | 775 | &chunk->subh.cookie_hdr->c.peer_addr, |
1da177e4 LT |
776 | peer_init, GFP_ATOMIC)) |
777 | goto nomem_init; | |
778 | ||
730fc3d0 VY |
779 | /* SCTP-AUTH: Now that we've populate required fields in |
780 | * sctp_process_init, set up the assocaition shared keys as | |
781 | * necessary so that we can potentially authenticate the ACK | |
782 | */ | |
783 | error = sctp_auth_asoc_init_active_key(new_asoc, GFP_ATOMIC); | |
784 | if (error) | |
785 | goto nomem_init; | |
786 | ||
3b54f1fd XL |
787 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) { |
788 | sctp_association_free(new_asoc); | |
789 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
bbd0d598 VY |
790 | } |
791 | ||
1da177e4 LT |
792 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
793 | if (!repl) | |
df7deeb5 | 794 | goto nomem_init; |
1da177e4 LT |
795 | |
796 | /* RFC 2960 5.1 Normal Establishment of an Association | |
797 | * | |
798 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
799 | * send the Communication Up notification to the SCTP user | |
800 | * upon reception of a valid COOKIE ECHO chunk. | |
801 | */ | |
802 | ev = sctp_ulpevent_make_assoc_change(new_asoc, 0, SCTP_COMM_UP, 0, | |
803 | new_asoc->c.sinit_num_ostreams, | |
804 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 805 | NULL, GFP_ATOMIC); |
1da177e4 LT |
806 | if (!ev) |
807 | goto nomem_ev; | |
808 | ||
d808ad9a | 809 | /* Sockets API Draft Section 5.3.1.6 |
0f3fffd8 | 810 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 811 | * delivers this notification to inform the application that of the |
0f3fffd8 | 812 | * peers requested adaptation layer. |
1da177e4 | 813 | */ |
0f3fffd8 ISJ |
814 | if (new_asoc->peer.adaptation_ind) { |
815 | ai_ev = sctp_ulpevent_make_adaptation_indication(new_asoc, | |
1da177e4 | 816 | GFP_ATOMIC); |
df7deeb5 VY |
817 | if (!ai_ev) |
818 | goto nomem_aiev; | |
819 | } | |
820 | ||
821 | /* Add all the state machine commands now since we've created | |
822 | * everything. This way we don't introduce memory corruptions | |
823 | * during side-effect processing and correclty count established | |
824 | * associations. | |
825 | */ | |
826 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
827 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
828 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
829 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
830 | SCTP_INC_STATS(net, SCTP_MIB_PASSIVEESTABS); | |
df7deeb5 VY |
831 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
832 | ||
9f70f46b | 833 | if (new_asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
df7deeb5 VY |
834 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
835 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
836 | ||
df7deeb5 VY |
837 | /* This will send the COOKIE ACK */ |
838 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
839 | ||
840 | /* Queue the ASSOC_CHANGE event */ | |
841 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
842 | ||
843 | /* Send up the Adaptation Layer Indication event */ | |
844 | if (ai_ev) | |
1da177e4 | 845 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
df7deeb5 | 846 | SCTP_ULPEVENT(ai_ev)); |
1da177e4 LT |
847 | |
848 | return SCTP_DISPOSITION_CONSUME; | |
849 | ||
df7deeb5 VY |
850 | nomem_aiev: |
851 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
852 | nomem_ev: |
853 | sctp_chunk_free(repl); | |
1da177e4 LT |
854 | nomem_init: |
855 | sctp_association_free(new_asoc); | |
856 | nomem: | |
857 | return SCTP_DISPOSITION_NOMEM; | |
858 | } | |
859 | ||
860 | /* | |
861 | * Respond to a normal COOKIE ACK chunk. | |
b52effd2 | 862 | * We are the side that is asking for an association. |
1da177e4 LT |
863 | * |
864 | * RFC 2960 5.1 Normal Establishment of an Association | |
865 | * | |
866 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move from the | |
867 | * COOKIE-ECHOED state to the ESTABLISHED state, stopping the T1-cookie | |
868 | * timer. It may also notify its ULP about the successful | |
869 | * establishment of the association with a Communication Up | |
870 | * notification (see Section 10). | |
871 | * | |
872 | * Verification Tag: | |
873 | * Inputs | |
874 | * (endpoint, asoc, chunk) | |
875 | * | |
876 | * Outputs | |
877 | * (asoc, reply_msg, msg_up, timers, counters) | |
878 | * | |
879 | * The return value is the disposition of the chunk. | |
880 | */ | |
172a1599 XL |
881 | enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net, |
882 | const struct sctp_endpoint *ep, | |
883 | const struct sctp_association *asoc, | |
884 | const union sctp_subtype type, | |
885 | void *arg, | |
886 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
887 | { |
888 | struct sctp_chunk *chunk = arg; | |
889 | struct sctp_ulpevent *ev; | |
890 | ||
891 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 892 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
893 | |
894 | /* Verify that the chunk length for the COOKIE-ACK is OK. | |
895 | * If we don't do this, any bundled chunks may be junked. | |
896 | */ | |
922dbc5b | 897 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 898 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
899 | commands); |
900 | ||
901 | /* Reset init error count upon receipt of COOKIE-ACK, | |
902 | * to avoid problems with the managemement of this | |
903 | * counter in stale cookie situations when a transition back | |
904 | * from the COOKIE-ECHOED state to the COOKIE-WAIT | |
905 | * state is performed. | |
906 | */ | |
3f7a87d2 | 907 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL()); |
1da177e4 LT |
908 | |
909 | /* RFC 2960 5.1 Normal Establishment of an Association | |
910 | * | |
911 | * E) Upon reception of the COOKIE ACK, endpoint "A" will move | |
912 | * from the COOKIE-ECHOED state to the ESTABLISHED state, | |
913 | * stopping the T1-cookie timer. | |
914 | */ | |
915 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
916 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
917 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
918 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
b01a2407 EB |
919 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
920 | SCTP_INC_STATS(net, SCTP_MIB_ACTIVEESTABS); | |
1da177e4 | 921 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
9f70f46b | 922 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
923 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, |
924 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
1da177e4 LT |
925 | |
926 | /* It may also notify its ULP about the successful | |
927 | * establishment of the association with a Communication Up | |
928 | * notification (see Section 10). | |
929 | */ | |
930 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_UP, | |
931 | 0, asoc->c.sinit_num_ostreams, | |
932 | asoc->c.sinit_max_instreams, | |
a5a35e76 | 933 | NULL, GFP_ATOMIC); |
1da177e4 LT |
934 | |
935 | if (!ev) | |
936 | goto nomem; | |
937 | ||
938 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
939 | ||
940 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 941 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 942 | * delivers this notification to inform the application that of the |
0f3fffd8 | 943 | * peers requested adaptation layer. |
1da177e4 | 944 | */ |
0f3fffd8 ISJ |
945 | if (asoc->peer.adaptation_ind) { |
946 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1da177e4 LT |
947 | if (!ev) |
948 | goto nomem; | |
949 | ||
950 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
951 | SCTP_ULPEVENT(ev)); | |
952 | } | |
953 | ||
954 | return SCTP_DISPOSITION_CONSUME; | |
955 | nomem: | |
956 | return SCTP_DISPOSITION_NOMEM; | |
957 | } | |
958 | ||
959 | /* Generate and sendout a heartbeat packet. */ | |
172a1599 XL |
960 | static enum sctp_disposition sctp_sf_heartbeat( |
961 | const struct sctp_endpoint *ep, | |
962 | const struct sctp_association *asoc, | |
963 | const union sctp_subtype type, | |
964 | void *arg, | |
965 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
966 | { |
967 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
968 | struct sctp_chunk *reply; | |
1da177e4 LT |
969 | |
970 | /* Send a heartbeat to our peer. */ | |
92c73af5 | 971 | reply = sctp_make_heartbeat(asoc, transport); |
1da177e4 LT |
972 | if (!reply) |
973 | return SCTP_DISPOSITION_NOMEM; | |
974 | ||
975 | /* Set rto_pending indicating that an RTT measurement | |
976 | * is started with this heartbeat chunk. | |
977 | */ | |
978 | sctp_add_cmd_sf(commands, SCTP_CMD_RTO_PENDING, | |
979 | SCTP_TRANSPORT(transport)); | |
980 | ||
981 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
982 | return SCTP_DISPOSITION_CONSUME; | |
983 | } | |
984 | ||
985 | /* Generate a HEARTBEAT packet on the given transport. */ | |
172a1599 XL |
986 | enum sctp_disposition sctp_sf_sendbeat_8_3(struct net *net, |
987 | const struct sctp_endpoint *ep, | |
988 | const struct sctp_association *asoc, | |
989 | const union sctp_subtype type, | |
990 | void *arg, | |
991 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
992 | { |
993 | struct sctp_transport *transport = (struct sctp_transport *) arg; | |
994 | ||
b9f84786 | 995 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
996 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
997 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
998 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
999 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 1000 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
1001 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1002 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
1003 | return SCTP_DISPOSITION_DELETE_TCB; |
1004 | } | |
1005 | ||
1006 | /* Section 3.3.5. | |
1007 | * The Sender-specific Heartbeat Info field should normally include | |
1008 | * information about the sender's current time when this HEARTBEAT | |
1009 | * chunk is sent and the destination transport address to which this | |
1010 | * HEARTBEAT is sent (see Section 8.3). | |
1011 | */ | |
1012 | ||
52ccb8e9 | 1013 | if (transport->param_flags & SPP_HB_ENABLE) { |
1da177e4 LT |
1014 | if (SCTP_DISPOSITION_NOMEM == |
1015 | sctp_sf_heartbeat(ep, asoc, type, arg, | |
1016 | commands)) | |
1017 | return SCTP_DISPOSITION_NOMEM; | |
245cba7e | 1018 | |
1da177e4 LT |
1019 | /* Set transport error counter and association error counter |
1020 | * when sending heartbeat. | |
1021 | */ | |
7e99013a | 1022 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
1da177e4 LT |
1023 | SCTP_TRANSPORT(transport)); |
1024 | } | |
245cba7e VY |
1025 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_IDLE, |
1026 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
1027 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMER_UPDATE, |
1028 | SCTP_TRANSPORT(transport)); | |
1029 | ||
d808ad9a | 1030 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1031 | } |
1032 | ||
7b9438de | 1033 | /* resend asoc strreset_chunk. */ |
172a1599 XL |
1034 | enum sctp_disposition sctp_sf_send_reconf(struct net *net, |
1035 | const struct sctp_endpoint *ep, | |
1036 | const struct sctp_association *asoc, | |
1037 | const union sctp_subtype type, | |
1038 | void *arg, | |
1039 | struct sctp_cmd_seq *commands) | |
7b9438de XL |
1040 | { |
1041 | struct sctp_transport *transport = arg; | |
1042 | ||
1043 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
1044 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
1045 | SCTP_ERROR(ETIMEDOUT)); | |
1046 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
1047 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
1048 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
1049 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
1050 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1051 | return SCTP_DISPOSITION_DELETE_TCB; | |
1052 | } | |
1053 | ||
1054 | sctp_chunk_hold(asoc->strreset_chunk); | |
1055 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1056 | SCTP_CHUNK(asoc->strreset_chunk)); | |
1057 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
1058 | ||
1059 | return SCTP_DISPOSITION_CONSUME; | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * Process an heartbeat request. | |
1064 | * | |
1065 | * Section: 8.3 Path Heartbeat | |
1066 | * The receiver of the HEARTBEAT should immediately respond with a | |
1067 | * HEARTBEAT ACK that contains the Heartbeat Information field copied | |
1068 | * from the received HEARTBEAT chunk. | |
1069 | * | |
1070 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1071 | * When receiving an SCTP packet, the endpoint MUST ensure that the | |
1072 | * value in the Verification Tag field of the received SCTP packet | |
1073 | * matches its own Tag. If the received Verification Tag value does not | |
1074 | * match the receiver's own tag value, the receiver shall silently | |
1075 | * discard the packet and shall not process it any further except for | |
1076 | * those cases listed in Section 8.5.1 below. | |
1077 | * | |
1078 | * Inputs | |
1079 | * (endpoint, asoc, chunk) | |
1080 | * | |
1081 | * Outputs | |
1082 | * (asoc, reply_msg, msg_up, timers, counters) | |
1083 | * | |
1084 | * The return value is the disposition of the chunk. | |
1085 | */ | |
172a1599 XL |
1086 | enum sctp_disposition sctp_sf_beat_8_3(struct net *net, |
1087 | const struct sctp_endpoint *ep, | |
1088 | const struct sctp_association *asoc, | |
1089 | const union sctp_subtype type, | |
1090 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 1091 | { |
3c918704 | 1092 | struct sctp_paramhdr *param_hdr; |
1da177e4 LT |
1093 | struct sctp_chunk *chunk = arg; |
1094 | struct sctp_chunk *reply; | |
1095 | size_t paylen = 0; | |
1096 | ||
1097 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1098 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1099 | |
1100 | /* Make sure that the HEARTBEAT chunk has a valid length. */ | |
38c00f74 XL |
1101 | if (!sctp_chunk_length_valid(chunk, |
1102 | sizeof(struct sctp_heartbeat_chunk))) | |
24cb81a6 | 1103 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1104 | commands); |
1105 | ||
1106 | /* 8.3 The receiver of the HEARTBEAT should immediately | |
1107 | * respond with a HEARTBEAT ACK that contains the Heartbeat | |
1108 | * Information field copied from the received HEARTBEAT chunk. | |
1109 | */ | |
4d2dcdf4 | 1110 | chunk->subh.hb_hdr = (struct sctp_heartbeathdr *)chunk->skb->data; |
3c918704 | 1111 | param_hdr = (struct sctp_paramhdr *)chunk->subh.hb_hdr; |
922dbc5b | 1112 | paylen = ntohs(chunk->chunk_hdr->length) - sizeof(struct sctp_chunkhdr); |
06a31e2b TG |
1113 | |
1114 | if (ntohs(param_hdr->length) > paylen) | |
1115 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
1116 | param_hdr, commands); | |
1117 | ||
62b08083 SS |
1118 | if (!pskb_pull(chunk->skb, paylen)) |
1119 | goto nomem; | |
1da177e4 | 1120 | |
06a31e2b | 1121 | reply = sctp_make_heartbeat_ack(asoc, chunk, param_hdr, paylen); |
1da177e4 LT |
1122 | if (!reply) |
1123 | goto nomem; | |
1124 | ||
1125 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
1126 | return SCTP_DISPOSITION_CONSUME; | |
1127 | ||
1128 | nomem: | |
1129 | return SCTP_DISPOSITION_NOMEM; | |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Process the returning HEARTBEAT ACK. | |
1134 | * | |
1135 | * Section: 8.3 Path Heartbeat | |
1136 | * Upon the receipt of the HEARTBEAT ACK, the sender of the HEARTBEAT | |
1137 | * should clear the error counter of the destination transport | |
1138 | * address to which the HEARTBEAT was sent, and mark the destination | |
1139 | * transport address as active if it is not so marked. The endpoint may | |
1140 | * optionally report to the upper layer when an inactive destination | |
1141 | * address is marked as active due to the reception of the latest | |
1142 | * HEARTBEAT ACK. The receiver of the HEARTBEAT ACK must also | |
1143 | * clear the association overall error count as well (as defined | |
1144 | * in section 8.1). | |
1145 | * | |
1146 | * The receiver of the HEARTBEAT ACK should also perform an RTT | |
1147 | * measurement for that destination transport address using the time | |
1148 | * value carried in the HEARTBEAT ACK chunk. | |
1149 | * | |
1150 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
1151 | * | |
1152 | * Inputs | |
1153 | * (endpoint, asoc, chunk) | |
1154 | * | |
1155 | * Outputs | |
1156 | * (asoc, reply_msg, msg_up, timers, counters) | |
1157 | * | |
1158 | * The return value is the disposition of the chunk. | |
1159 | */ | |
172a1599 XL |
1160 | enum sctp_disposition sctp_sf_backbeat_8_3(struct net *net, |
1161 | const struct sctp_endpoint *ep, | |
1162 | const struct sctp_association *asoc, | |
1163 | const union sctp_subtype type, | |
1164 | void *arg, | |
1165 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1166 | { |
edf903f8 | 1167 | struct sctp_sender_hb_info *hbinfo; |
1da177e4 | 1168 | struct sctp_chunk *chunk = arg; |
1da177e4 | 1169 | struct sctp_transport *link; |
1da177e4 | 1170 | unsigned long max_interval; |
edf903f8 | 1171 | union sctp_addr from_addr; |
1da177e4 LT |
1172 | |
1173 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 1174 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1175 | |
1176 | /* Make sure that the HEARTBEAT-ACK chunk has a valid length. */ | |
922dbc5b | 1177 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr) + |
edf903f8 | 1178 | sizeof(*hbinfo))) |
24cb81a6 | 1179 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1180 | commands); |
1181 | ||
edf903f8 | 1182 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
a601266e | 1183 | /* Make sure that the length of the parameter is what we expect */ |
edf903f8 | 1184 | if (ntohs(hbinfo->param_hdr.length) != sizeof(*hbinfo)) |
a601266e | 1185 | return SCTP_DISPOSITION_DISCARD; |
a601266e | 1186 | |
1da177e4 | 1187 | from_addr = hbinfo->daddr; |
63de08f4 | 1188 | link = sctp_assoc_lookup_paddr(asoc, &from_addr); |
1da177e4 LT |
1189 | |
1190 | /* This should never happen, but lets log it if so. */ | |
3f7a87d2 FF |
1191 | if (unlikely(!link)) { |
1192 | if (from_addr.sa.sa_family == AF_INET6) { | |
e87cc472 JP |
1193 | net_warn_ratelimited("%s association %p could not find address %pI6\n", |
1194 | __func__, | |
1195 | asoc, | |
1196 | &from_addr.v6.sin6_addr); | |
3f7a87d2 | 1197 | } else { |
e87cc472 JP |
1198 | net_warn_ratelimited("%s association %p could not find address %pI4\n", |
1199 | __func__, | |
1200 | asoc, | |
1201 | &from_addr.v4.sin_addr.s_addr); | |
3f7a87d2 | 1202 | } |
1da177e4 LT |
1203 | return SCTP_DISPOSITION_DISCARD; |
1204 | } | |
1205 | ||
ad8fec17 SS |
1206 | /* Validate the 64-bit random nonce. */ |
1207 | if (hbinfo->hb_nonce != link->hb_nonce) | |
1208 | return SCTP_DISPOSITION_DISCARD; | |
1209 | ||
52ccb8e9 | 1210 | max_interval = link->hbinterval + link->rto; |
1da177e4 LT |
1211 | |
1212 | /* Check if the timestamp looks valid. */ | |
1213 | if (time_after(hbinfo->sent_at, jiffies) || | |
1214 | time_after(jiffies, hbinfo->sent_at + max_interval)) { | |
bb33381d DB |
1215 | pr_debug("%s: HEARTBEAT ACK with invalid timestamp received " |
1216 | "for transport:%p\n", __func__, link); | |
1217 | ||
1da177e4 LT |
1218 | return SCTP_DISPOSITION_DISCARD; |
1219 | } | |
1220 | ||
1221 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of | |
1222 | * the HEARTBEAT should clear the error counter of the | |
1223 | * destination transport address to which the HEARTBEAT was | |
1224 | * sent and mark the destination transport address as active if | |
1225 | * it is not so marked. | |
1226 | */ | |
1227 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_ON, SCTP_TRANSPORT(link)); | |
1228 | ||
1229 | return SCTP_DISPOSITION_CONSUME; | |
1230 | } | |
1231 | ||
1232 | /* Helper function to send out an abort for the restart | |
1233 | * condition. | |
1234 | */ | |
2ce95503 | 1235 | static int sctp_sf_send_restart_abort(struct net *net, union sctp_addr *ssa, |
1da177e4 | 1236 | struct sctp_chunk *init, |
a85bbeb2 | 1237 | struct sctp_cmd_seq *commands) |
1da177e4 | 1238 | { |
172a1599 | 1239 | struct sctp_af *af = sctp_get_af_specific(ssa->v4.sin_family); |
1da177e4 LT |
1240 | union sctp_addr_param *addrparm; |
1241 | struct sctp_errhdr *errhdr; | |
d8238d9d | 1242 | char buffer[sizeof(*errhdr) + sizeof(*addrparm)]; |
172a1599 XL |
1243 | struct sctp_endpoint *ep; |
1244 | struct sctp_packet *pkt; | |
1245 | int len; | |
1da177e4 LT |
1246 | |
1247 | /* Build the error on the stack. We are way to malloc crazy | |
1248 | * throughout the code today. | |
1249 | */ | |
1250 | errhdr = (struct sctp_errhdr *)buffer; | |
1251 | addrparm = (union sctp_addr_param *)errhdr->variable; | |
1252 | ||
1253 | /* Copy into a parm format. */ | |
1254 | len = af->to_addr_param(ssa, addrparm); | |
d8238d9d | 1255 | len += sizeof(*errhdr); |
1da177e4 LT |
1256 | |
1257 | errhdr->cause = SCTP_ERROR_RESTART; | |
1258 | errhdr->length = htons(len); | |
1259 | ||
1260 | /* Assign to the control socket. */ | |
2ce95503 | 1261 | ep = sctp_sk(net->sctp.ctl_sock)->ep; |
1da177e4 LT |
1262 | |
1263 | /* Association is NULL since this may be a restart attack and we | |
1264 | * want to send back the attacker's vtag. | |
1265 | */ | |
24cb81a6 | 1266 | pkt = sctp_abort_pkt_new(net, ep, NULL, init, errhdr, len); |
1da177e4 LT |
1267 | |
1268 | if (!pkt) | |
1269 | goto out; | |
1270 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, SCTP_PACKET(pkt)); | |
1271 | ||
b01a2407 | 1272 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1273 | |
1274 | /* Discard the rest of the inbound packet. */ | |
1275 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); | |
1276 | ||
1277 | out: | |
1278 | /* Even if there is no memory, treat as a failure so | |
1279 | * the packet will get dropped. | |
1280 | */ | |
1281 | return 0; | |
1282 | } | |
1283 | ||
123031c0 JP |
1284 | static bool list_has_sctp_addr(const struct list_head *list, |
1285 | union sctp_addr *ipaddr) | |
1286 | { | |
1287 | struct sctp_transport *addr; | |
1288 | ||
1289 | list_for_each_entry(addr, list, transports) { | |
1290 | if (sctp_cmp_addr_exact(ipaddr, &addr->ipaddr)) | |
1291 | return true; | |
1292 | } | |
1293 | ||
1294 | return false; | |
1295 | } | |
1da177e4 LT |
1296 | /* A restart is occurring, check to make sure no new addresses |
1297 | * are being added as we may be under a takeover attack. | |
1298 | */ | |
1299 | static int sctp_sf_check_restart_addrs(const struct sctp_association *new_asoc, | |
1300 | const struct sctp_association *asoc, | |
1301 | struct sctp_chunk *init, | |
a85bbeb2 | 1302 | struct sctp_cmd_seq *commands) |
1da177e4 | 1303 | { |
2ce95503 | 1304 | struct net *net = sock_net(new_asoc->base.sk); |
123031c0 JP |
1305 | struct sctp_transport *new_addr; |
1306 | int ret = 1; | |
1da177e4 | 1307 | |
123031c0 | 1308 | /* Implementor's Guide - Section 5.2.2 |
1da177e4 LT |
1309 | * ... |
1310 | * Before responding the endpoint MUST check to see if the | |
1311 | * unexpected INIT adds new addresses to the association. If new | |
1312 | * addresses are added to the association, the endpoint MUST respond | |
1313 | * with an ABORT.. | |
1314 | */ | |
1315 | ||
1316 | /* Search through all current addresses and make sure | |
1317 | * we aren't adding any new ones. | |
1318 | */ | |
9dbc15f0 | 1319 | list_for_each_entry(new_addr, &new_asoc->peer.transport_addr_list, |
123031c0 JP |
1320 | transports) { |
1321 | if (!list_has_sctp_addr(&asoc->peer.transport_addr_list, | |
1322 | &new_addr->ipaddr)) { | |
2ce95503 | 1323 | sctp_sf_send_restart_abort(net, &new_addr->ipaddr, init, |
123031c0 JP |
1324 | commands); |
1325 | ret = 0; | |
1da177e4 | 1326 | break; |
123031c0 | 1327 | } |
1da177e4 LT |
1328 | } |
1329 | ||
1330 | /* Return success if all addresses were found. */ | |
123031c0 | 1331 | return ret; |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | /* Populate the verification/tie tags based on overlapping INIT | |
1335 | * scenario. | |
1336 | * | |
1337 | * Note: Do not use in CLOSED or SHUTDOWN-ACK-SENT state. | |
1338 | */ | |
1339 | static void sctp_tietags_populate(struct sctp_association *new_asoc, | |
1340 | const struct sctp_association *asoc) | |
1341 | { | |
1342 | switch (asoc->state) { | |
1343 | ||
1344 | /* 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State */ | |
1345 | ||
1346 | case SCTP_STATE_COOKIE_WAIT: | |
1347 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1348 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1349 | new_asoc->c.peer_ttag = 0; | |
1350 | break; | |
1351 | ||
1352 | case SCTP_STATE_COOKIE_ECHOED: | |
1353 | new_asoc->c.my_vtag = asoc->c.my_vtag; | |
1354 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1355 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1356 | break; | |
1357 | ||
1358 | /* 5.2.2 Unexpected INIT in States Other than CLOSED, COOKIE-ECHOED, | |
1359 | * COOKIE-WAIT and SHUTDOWN-ACK-SENT | |
1360 | */ | |
1361 | default: | |
1362 | new_asoc->c.my_ttag = asoc->c.my_vtag; | |
1363 | new_asoc->c.peer_ttag = asoc->c.peer_vtag; | |
1364 | break; | |
3ff50b79 | 1365 | } |
1da177e4 LT |
1366 | |
1367 | /* Other parameters for the endpoint SHOULD be copied from the | |
1368 | * existing parameters of the association (e.g. number of | |
1369 | * outbound streams) into the INIT ACK and cookie. | |
1370 | */ | |
1371 | new_asoc->rwnd = asoc->rwnd; | |
1372 | new_asoc->c.sinit_num_ostreams = asoc->c.sinit_num_ostreams; | |
1373 | new_asoc->c.sinit_max_instreams = asoc->c.sinit_max_instreams; | |
1374 | new_asoc->c.initial_tsn = asoc->c.initial_tsn; | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * Compare vtag/tietag values to determine unexpected COOKIE-ECHO | |
1379 | * handling action. | |
1380 | * | |
1381 | * RFC 2960 5.2.4 Handle a COOKIE ECHO when a TCB exists. | |
1382 | * | |
1383 | * Returns value representing action to be taken. These action values | |
1384 | * correspond to Action/Description values in RFC 2960, Table 2. | |
1385 | */ | |
1386 | static char sctp_tietags_compare(struct sctp_association *new_asoc, | |
1387 | const struct sctp_association *asoc) | |
1388 | { | |
1389 | /* In this case, the peer may have restarted. */ | |
1390 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1391 | (asoc->c.peer_vtag != new_asoc->c.peer_vtag) && | |
1392 | (asoc->c.my_vtag == new_asoc->c.my_ttag) && | |
1393 | (asoc->c.peer_vtag == new_asoc->c.peer_ttag)) | |
1394 | return 'A'; | |
1395 | ||
1396 | /* Collision case B. */ | |
1397 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1398 | ((asoc->c.peer_vtag != new_asoc->c.peer_vtag) || | |
1399 | (0 == asoc->c.peer_vtag))) { | |
1400 | return 'B'; | |
1401 | } | |
1402 | ||
1403 | /* Collision case D. */ | |
1404 | if ((asoc->c.my_vtag == new_asoc->c.my_vtag) && | |
1405 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag)) | |
1406 | return 'D'; | |
1407 | ||
1408 | /* Collision case C. */ | |
1409 | if ((asoc->c.my_vtag != new_asoc->c.my_vtag) && | |
1410 | (asoc->c.peer_vtag == new_asoc->c.peer_vtag) && | |
1411 | (0 == new_asoc->c.my_ttag) && | |
1412 | (0 == new_asoc->c.peer_ttag)) | |
1413 | return 'C'; | |
1414 | ||
1415 | /* No match to any of the special cases; discard this packet. */ | |
1416 | return 'E'; | |
1417 | } | |
1418 | ||
1419 | /* Common helper routine for both duplicate and simulataneous INIT | |
1420 | * chunk handling. | |
1421 | */ | |
172a1599 XL |
1422 | static enum sctp_disposition sctp_sf_do_unexpected_init( |
1423 | struct net *net, | |
1424 | const struct sctp_endpoint *ep, | |
1425 | const struct sctp_association *asoc, | |
1426 | const union sctp_subtype type, | |
1427 | void *arg, | |
1428 | struct sctp_cmd_seq *commands) | |
1da177e4 | 1429 | { |
62e6b7e4 XL |
1430 | struct sctp_chunk *chunk = arg, *repl, *err_chunk; |
1431 | struct sctp_unrecognized_param *unk_param; | |
1da177e4 | 1432 | struct sctp_association *new_asoc; |
172a1599 | 1433 | enum sctp_disposition retval; |
1da177e4 | 1434 | struct sctp_packet *packet; |
1da177e4 LT |
1435 | int len; |
1436 | ||
1437 | /* 6.10 Bundling | |
1438 | * An endpoint MUST NOT bundle INIT, INIT ACK or | |
1439 | * SHUTDOWN COMPLETE with any other chunks. | |
1440 | * | |
1441 | * IG Section 2.11.2 | |
1442 | * Furthermore, we require that the receiver of an INIT chunk MUST | |
1443 | * enforce these rules by silently discarding an arriving packet | |
1444 | * with an INIT chunk that is bundled with other chunks. | |
1445 | */ | |
1446 | if (!chunk->singleton) | |
24cb81a6 | 1447 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1448 | |
1449 | /* 3.1 A packet containing an INIT chunk MUST have a zero Verification | |
d808ad9a | 1450 | * Tag. |
1da177e4 LT |
1451 | */ |
1452 | if (chunk->sctp_hdr->vtag != 0) | |
24cb81a6 | 1453 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1454 | |
1455 | /* Make sure that the INIT chunk has a valid length. | |
1456 | * In this case, we generate a protocol violation since we have | |
1457 | * an association established. | |
1458 | */ | |
01a992be | 1459 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_init_chunk))) |
24cb81a6 | 1460 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
1461 | commands); |
1462 | /* Grab the INIT header. */ | |
4ae70c08 | 1463 | chunk->subh.init_hdr = (struct sctp_inithdr *)chunk->skb->data; |
1da177e4 LT |
1464 | |
1465 | /* Tag the variable length parameters. */ | |
4ae70c08 | 1466 | chunk->param_hdr.v = skb_pull(chunk->skb, sizeof(struct sctp_inithdr)); |
1da177e4 LT |
1467 | |
1468 | /* Verify the INIT chunk before processing it. */ | |
1469 | err_chunk = NULL; | |
b14878cc | 1470 | if (!sctp_verify_init(net, ep, asoc, chunk->chunk_hdr->type, |
01a992be | 1471 | (struct sctp_init_chunk *)chunk->chunk_hdr, chunk, |
1da177e4 LT |
1472 | &err_chunk)) { |
1473 | /* This chunk contains fatal error. It is to be discarded. | |
1474 | * Send an ABORT, with causes if there is any. | |
1475 | */ | |
1476 | if (err_chunk) { | |
24cb81a6 | 1477 | packet = sctp_abort_pkt_new(net, ep, asoc, arg, |
1da177e4 | 1478 | (__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1479 | sizeof(struct sctp_chunkhdr), |
1da177e4 | 1480 | ntohs(err_chunk->chunk_hdr->length) - |
922dbc5b | 1481 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1482 | |
1483 | if (packet) { | |
1484 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
1485 | SCTP_PACKET(packet)); | |
24cb81a6 | 1486 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
1487 | retval = SCTP_DISPOSITION_CONSUME; |
1488 | } else { | |
1489 | retval = SCTP_DISPOSITION_NOMEM; | |
1490 | } | |
1491 | goto cleanup; | |
1492 | } else { | |
24cb81a6 | 1493 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, |
1da177e4 LT |
1494 | commands); |
1495 | } | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Other parameters for the endpoint SHOULD be copied from the | |
1500 | * existing parameters of the association (e.g. number of | |
1501 | * outbound streams) into the INIT ACK and cookie. | |
1502 | * FIXME: We are copying parameters from the endpoint not the | |
1503 | * association. | |
1504 | */ | |
1505 | new_asoc = sctp_make_temp_asoc(ep, chunk, GFP_ATOMIC); | |
1506 | if (!new_asoc) | |
1507 | goto nomem; | |
1508 | ||
409b95af VY |
1509 | if (sctp_assoc_set_bind_addr_from_ep(new_asoc, |
1510 | sctp_scope(sctp_source(chunk)), GFP_ATOMIC) < 0) | |
1511 | goto nomem; | |
1512 | ||
1da177e4 LT |
1513 | /* In the outbound INIT ACK the endpoint MUST copy its current |
1514 | * Verification Tag and Peers Verification tag into a reserved | |
1515 | * place (local tie-tag and per tie-tag) within the state cookie. | |
1516 | */ | |
de6becdc | 1517 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), |
01a992be | 1518 | (struct sctp_init_chunk *)chunk->chunk_hdr, |
df7deeb5 VY |
1519 | GFP_ATOMIC)) |
1520 | goto nomem; | |
1da177e4 LT |
1521 | |
1522 | /* Make sure no new addresses are being added during the | |
1523 | * restart. Do not do this check for COOKIE-WAIT state, | |
1524 | * since there are no peer addresses to check against. | |
1525 | * Upon return an ABORT will have been sent if needed. | |
1526 | */ | |
1527 | if (!sctp_state(asoc, COOKIE_WAIT)) { | |
1528 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, | |
1529 | commands)) { | |
1530 | retval = SCTP_DISPOSITION_CONSUME; | |
df7deeb5 | 1531 | goto nomem_retval; |
1da177e4 LT |
1532 | } |
1533 | } | |
1534 | ||
1535 | sctp_tietags_populate(new_asoc, asoc); | |
1536 | ||
1537 | /* B) "Z" shall respond immediately with an INIT ACK chunk. */ | |
1538 | ||
1539 | /* If there are errors need to be reported for unknown parameters, | |
1540 | * make sure to reserve enough room in the INIT ACK for them. | |
1541 | */ | |
1542 | len = 0; | |
1543 | if (err_chunk) { | |
1544 | len = ntohs(err_chunk->chunk_hdr->length) - | |
922dbc5b | 1545 | sizeof(struct sctp_chunkhdr); |
1da177e4 LT |
1546 | } |
1547 | ||
1da177e4 LT |
1548 | repl = sctp_make_init_ack(new_asoc, chunk, GFP_ATOMIC, len); |
1549 | if (!repl) | |
1550 | goto nomem; | |
1551 | ||
1552 | /* If there are errors need to be reported for unknown parameters, | |
1553 | * include them in the outgoing INIT ACK as "Unrecognized parameter" | |
1554 | * parameter. | |
1555 | */ | |
1556 | if (err_chunk) { | |
1557 | /* Get the "Unrecognized parameter" parameter(s) out of the | |
1558 | * ERROR chunk generated by sctp_verify_init(). Since the | |
1559 | * error cause code for "unknown parameter" and the | |
1560 | * "Unrecognized parameter" type is the same, we can | |
1561 | * construct the parameters in INIT ACK by copying the | |
1562 | * ERROR causes over. | |
1563 | */ | |
62e6b7e4 | 1564 | unk_param = (struct sctp_unrecognized_param *) |
1da177e4 | 1565 | ((__u8 *)(err_chunk->chunk_hdr) + |
922dbc5b | 1566 | sizeof(struct sctp_chunkhdr)); |
1da177e4 LT |
1567 | /* Replace the cause code with the "Unrecognized parameter" |
1568 | * parameter type. | |
1569 | */ | |
1570 | sctp_addto_chunk(repl, len, unk_param); | |
1571 | } | |
1572 | ||
1573 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(new_asoc)); | |
1574 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1575 | ||
1576 | /* | |
1577 | * Note: After sending out INIT ACK with the State Cookie parameter, | |
1578 | * "Z" MUST NOT allocate any resources for this new association. | |
1579 | * Otherwise, "Z" will be vulnerable to resource attacks. | |
1580 | */ | |
1581 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
1582 | retval = SCTP_DISPOSITION_CONSUME; | |
1583 | ||
df7deeb5 VY |
1584 | return retval; |
1585 | ||
1586 | nomem: | |
1587 | retval = SCTP_DISPOSITION_NOMEM; | |
1588 | nomem_retval: | |
1589 | if (new_asoc) | |
1590 | sctp_association_free(new_asoc); | |
1da177e4 LT |
1591 | cleanup: |
1592 | if (err_chunk) | |
1593 | sctp_chunk_free(err_chunk); | |
1594 | return retval; | |
1da177e4 LT |
1595 | } |
1596 | ||
1597 | /* | |
25985edc | 1598 | * Handle simultaneous INIT. |
1da177e4 LT |
1599 | * This means we started an INIT and then we got an INIT request from |
1600 | * our peer. | |
1601 | * | |
1602 | * Section: 5.2.1 INIT received in COOKIE-WAIT or COOKIE-ECHOED State (Item B) | |
1603 | * This usually indicates an initialization collision, i.e., each | |
1604 | * endpoint is attempting, at about the same time, to establish an | |
1605 | * association with the other endpoint. | |
1606 | * | |
1607 | * Upon receipt of an INIT in the COOKIE-WAIT or COOKIE-ECHOED state, an | |
1608 | * endpoint MUST respond with an INIT ACK using the same parameters it | |
1609 | * sent in its original INIT chunk (including its Verification Tag, | |
1610 | * unchanged). These original parameters are combined with those from the | |
1611 | * newly received INIT chunk. The endpoint shall also generate a State | |
1612 | * Cookie with the INIT ACK. The endpoint uses the parameters sent in its | |
1613 | * INIT to calculate the State Cookie. | |
1614 | * | |
1615 | * After that, the endpoint MUST NOT change its state, the T1-init | |
1616 | * timer shall be left running and the corresponding TCB MUST NOT be | |
1617 | * destroyed. The normal procedures for handling State Cookies when | |
1618 | * a TCB exists will resolve the duplicate INITs to a single association. | |
1619 | * | |
1620 | * For an endpoint that is in the COOKIE-ECHOED state it MUST populate | |
1621 | * its Tie-Tags with the Tag information of itself and its peer (see | |
1622 | * section 5.2.2 for a description of the Tie-Tags). | |
1623 | * | |
1624 | * Verification Tag: Not explicit, but an INIT can not have a valid | |
1625 | * verification tag, so we skip the check. | |
1626 | * | |
1627 | * Inputs | |
1628 | * (endpoint, asoc, chunk) | |
1629 | * | |
1630 | * Outputs | |
1631 | * (asoc, reply_msg, msg_up, timers, counters) | |
1632 | * | |
1633 | * The return value is the disposition of the chunk. | |
1634 | */ | |
172a1599 XL |
1635 | enum sctp_disposition sctp_sf_do_5_2_1_siminit( |
1636 | struct net *net, | |
1637 | const struct sctp_endpoint *ep, | |
1638 | const struct sctp_association *asoc, | |
1639 | const union sctp_subtype type, | |
1640 | void *arg, | |
1641 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
1642 | { |
1643 | /* Call helper to do the real work for both simulataneous and | |
1644 | * duplicate INIT chunk handling. | |
1645 | */ | |
24cb81a6 | 1646 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | /* | |
1650 | * Handle duplicated INIT messages. These are usually delayed | |
1651 | * restransmissions. | |
1652 | * | |
1653 | * Section: 5.2.2 Unexpected INIT in States Other than CLOSED, | |
1654 | * COOKIE-ECHOED and COOKIE-WAIT | |
1655 | * | |
1656 | * Unless otherwise stated, upon reception of an unexpected INIT for | |
1657 | * this association, the endpoint shall generate an INIT ACK with a | |
1658 | * State Cookie. In the outbound INIT ACK the endpoint MUST copy its | |
1659 | * current Verification Tag and peer's Verification Tag into a reserved | |
1660 | * place within the state cookie. We shall refer to these locations as | |
1661 | * the Peer's-Tie-Tag and the Local-Tie-Tag. The outbound SCTP packet | |
1662 | * containing this INIT ACK MUST carry a Verification Tag value equal to | |
1663 | * the Initiation Tag found in the unexpected INIT. And the INIT ACK | |
1664 | * MUST contain a new Initiation Tag (randomly generated see Section | |
1665 | * 5.3.1). Other parameters for the endpoint SHOULD be copied from the | |
1666 | * existing parameters of the association (e.g. number of outbound | |
1667 | * streams) into the INIT ACK and cookie. | |
1668 | * | |
1669 | * After sending out the INIT ACK, the endpoint shall take no further | |
1670 | * actions, i.e., the existing association, including its current state, | |
1671 | * and the corresponding TCB MUST NOT be changed. | |
1672 | * | |
1673 | * Note: Only when a TCB exists and the association is not in a COOKIE- | |
1674 | * WAIT state are the Tie-Tags populated. For a normal association INIT | |
1675 | * (i.e. the endpoint is in a COOKIE-WAIT state), the Tie-Tags MUST be | |
1676 | * set to 0 (indicating that no previous TCB existed). The INIT ACK and | |
1677 | * State Cookie are populated as specified in section 5.2.1. | |
1678 | * | |
1679 | * Verification Tag: Not specified, but an INIT has no way of knowing | |
1680 | * what the verification tag could be, so we ignore it. | |
1681 | * | |
1682 | * Inputs | |
1683 | * (endpoint, asoc, chunk) | |
1684 | * | |
1685 | * Outputs | |
1686 | * (asoc, reply_msg, msg_up, timers, counters) | |
1687 | * | |
1688 | * The return value is the disposition of the chunk. | |
1689 | */ | |
172a1599 XL |
1690 | enum sctp_disposition sctp_sf_do_5_2_2_dupinit( |
1691 | struct net *net, | |
24cb81a6 | 1692 | const struct sctp_endpoint *ep, |
1da177e4 | 1693 | const struct sctp_association *asoc, |
bfc6f827 | 1694 | const union sctp_subtype type, |
1da177e4 | 1695 | void *arg, |
a85bbeb2 | 1696 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
1697 | { |
1698 | /* Call helper to do the real work for both simulataneous and | |
1699 | * duplicate INIT chunk handling. | |
1700 | */ | |
24cb81a6 | 1701 | return sctp_sf_do_unexpected_init(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
1702 | } |
1703 | ||
1704 | ||
610ab73a VY |
1705 | /* |
1706 | * Unexpected INIT-ACK handler. | |
1707 | * | |
1708 | * Section 5.2.3 | |
1709 | * If an INIT ACK received by an endpoint in any state other than the | |
1710 | * COOKIE-WAIT state, the endpoint should discard the INIT ACK chunk. | |
1711 | * An unexpected INIT ACK usually indicates the processing of an old or | |
1712 | * duplicated INIT chunk. | |
1713 | */ | |
172a1599 XL |
1714 | enum sctp_disposition sctp_sf_do_5_2_3_initack( |
1715 | struct net *net, | |
1716 | const struct sctp_endpoint *ep, | |
1717 | const struct sctp_association *asoc, | |
1718 | const union sctp_subtype type, | |
1719 | void *arg, | |
1720 | struct sctp_cmd_seq *commands) | |
610ab73a VY |
1721 | { |
1722 | /* Per the above section, we'll discard the chunk if we have an | |
1723 | * endpoint. If this is an OOTB INIT-ACK, treat it as such. | |
1724 | */ | |
2ce95503 | 1725 | if (ep == sctp_sk(net->sctp.ctl_sock)->ep) |
24cb81a6 | 1726 | return sctp_sf_ootb(net, ep, asoc, type, arg, commands); |
610ab73a | 1727 | else |
24cb81a6 | 1728 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
610ab73a | 1729 | } |
1da177e4 LT |
1730 | |
1731 | /* Unexpected COOKIE-ECHO handler for peer restart (Table 2, action 'A') | |
1732 | * | |
1733 | * Section 5.2.4 | |
1734 | * A) In this case, the peer may have restarted. | |
1735 | */ | |
172a1599 XL |
1736 | static enum sctp_disposition sctp_sf_do_dupcook_a( |
1737 | struct net *net, | |
24cb81a6 | 1738 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1739 | const struct sctp_association *asoc, |
1740 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1741 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1742 | struct sctp_association *new_asoc) |
1743 | { | |
01a992be | 1744 | struct sctp_init_chunk *peer_init; |
172a1599 | 1745 | enum sctp_disposition disposition; |
1da177e4 LT |
1746 | struct sctp_ulpevent *ev; |
1747 | struct sctp_chunk *repl; | |
1748 | struct sctp_chunk *err; | |
1da177e4 LT |
1749 | |
1750 | /* new_asoc is a brand-new association, so these are not yet | |
1751 | * side effects--it is safe to run them here. | |
1752 | */ | |
1753 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
1754 | ||
de6becdc | 1755 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1756 | GFP_ATOMIC)) |
1757 | goto nomem; | |
1758 | ||
3b54f1fd XL |
1759 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1760 | return SCTP_DISPOSITION_DISCARD; | |
1761 | ||
1da177e4 LT |
1762 | /* Make sure no new addresses are being added during the |
1763 | * restart. Though this is a pretty complicated attack | |
1764 | * since you'd have to get inside the cookie. | |
1765 | */ | |
3b54f1fd | 1766 | if (!sctp_sf_check_restart_addrs(new_asoc, asoc, chunk, commands)) |
1da177e4 | 1767 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
1768 | |
1769 | /* If the endpoint is in the SHUTDOWN-ACK-SENT state and recognizes | |
1770 | * the peer has restarted (Action A), it MUST NOT setup a new | |
1771 | * association but instead resend the SHUTDOWN ACK and send an ERROR | |
1772 | * chunk with a "Cookie Received while Shutting Down" error cause to | |
1773 | * its peer. | |
1774 | */ | |
1775 | if (sctp_state(asoc, SHUTDOWN_ACK_SENT)) { | |
24cb81a6 | 1776 | disposition = sctp_sf_do_9_2_reshutack(net, ep, asoc, |
1da177e4 LT |
1777 | SCTP_ST_CHUNK(chunk->chunk_hdr->type), |
1778 | chunk, commands); | |
1779 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
1780 | goto nomem; | |
1781 | ||
1782 | err = sctp_make_op_error(asoc, chunk, | |
1783 | SCTP_ERROR_COOKIE_IN_SHUTDOWN, | |
6383cfb3 | 1784 | NULL, 0, 0); |
1da177e4 LT |
1785 | if (err) |
1786 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1787 | SCTP_CHUNK(err)); | |
1788 | ||
1789 | return SCTP_DISPOSITION_CONSUME; | |
1790 | } | |
1791 | ||
a000c01e WY |
1792 | /* For now, stop pending T3-rtx and SACK timers, fail any unsent/unacked |
1793 | * data. Consider the optional choice of resending of this data. | |
1da177e4 | 1794 | */ |
a000c01e WY |
1795 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); |
1796 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1797 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 LT |
1798 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_OUTQUEUE, SCTP_NULL()); |
1799 | ||
a000c01e WY |
1800 | /* Stop pending T4-rto timer, teardown ASCONF queue, ASCONF-ACK queue |
1801 | * and ASCONF-ACK cache. | |
1802 | */ | |
1803 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1804 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
1805 | sctp_add_cmd_sf(commands, SCTP_CMD_PURGE_ASCONF_QUEUE, SCTP_NULL()); | |
1806 | ||
1da177e4 LT |
1807 | repl = sctp_make_cookie_ack(new_asoc, chunk); |
1808 | if (!repl) | |
1809 | goto nomem; | |
1810 | ||
1da177e4 LT |
1811 | /* Report association restart to upper layer. */ |
1812 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_RESTART, 0, | |
1813 | new_asoc->c.sinit_num_ostreams, | |
1814 | new_asoc->c.sinit_max_instreams, | |
a5a35e76 | 1815 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1816 | if (!ev) |
1817 | goto nomem_ev; | |
1818 | ||
df7deeb5 VY |
1819 | /* Update the content of current association. */ |
1820 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1da177e4 | 1821 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
bdf6fa52 VY |
1822 | if (sctp_state(asoc, SHUTDOWN_PENDING) && |
1823 | (sctp_sstate(asoc->base.sk, CLOSING) || | |
1824 | sock_flag(asoc->base.sk, SOCK_DEAD))) { | |
1825 | /* if were currently in SHUTDOWN_PENDING, but the socket | |
1826 | * has been closed by user, don't transition to ESTABLISHED. | |
1827 | * Instead trigger SHUTDOWN bundled with COOKIE_ACK. | |
1828 | */ | |
1829 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1830 | return sctp_sf_do_9_2_start_shutdown(net, ep, asoc, | |
1831 | SCTP_ST_CHUNK(0), NULL, | |
1832 | commands); | |
1833 | } else { | |
1834 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1835 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
1836 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1837 | } | |
1da177e4 LT |
1838 | return SCTP_DISPOSITION_CONSUME; |
1839 | ||
1840 | nomem_ev: | |
1841 | sctp_chunk_free(repl); | |
1842 | nomem: | |
1843 | return SCTP_DISPOSITION_NOMEM; | |
1844 | } | |
1845 | ||
1846 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'B') | |
1847 | * | |
1848 | * Section 5.2.4 | |
1849 | * B) In this case, both sides may be attempting to start an association | |
1850 | * at about the same time but the peer endpoint started its INIT | |
1851 | * after responding to the local endpoint's INIT | |
1852 | */ | |
1853 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1854 | static enum sctp_disposition sctp_sf_do_dupcook_b( |
1855 | struct net *net, | |
24cb81a6 | 1856 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1857 | const struct sctp_association *asoc, |
1858 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1859 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1860 | struct sctp_association *new_asoc) |
1861 | { | |
01a992be | 1862 | struct sctp_init_chunk *peer_init; |
1da177e4 LT |
1863 | struct sctp_chunk *repl; |
1864 | ||
1865 | /* new_asoc is a brand-new association, so these are not yet | |
1866 | * side effects--it is safe to run them here. | |
1867 | */ | |
1868 | peer_init = &chunk->subh.cookie_hdr->c.peer_init[0]; | |
de6becdc | 1869 | if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init, |
1da177e4 LT |
1870 | GFP_ATOMIC)) |
1871 | goto nomem; | |
1872 | ||
3b54f1fd XL |
1873 | if (!sctp_auth_chunk_verify(net, chunk, new_asoc)) |
1874 | return SCTP_DISPOSITION_DISCARD; | |
1875 | ||
1da177e4 LT |
1876 | /* Update the content of current association. */ |
1877 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc)); | |
1878 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1879 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1880 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1881 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL()); |
1882 | ||
1883 | repl = sctp_make_cookie_ack(new_asoc, chunk); | |
1884 | if (!repl) | |
1885 | goto nomem; | |
1886 | ||
1887 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
1da177e4 LT |
1888 | |
1889 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1890 | * | |
1891 | * D) IMPLEMENTATION NOTE: An implementation may choose to | |
1892 | * send the Communication Up notification to the SCTP user | |
1893 | * upon reception of a valid COOKIE ECHO chunk. | |
07d93967 VY |
1894 | * |
1895 | * Sadly, this needs to be implemented as a side-effect, because | |
1896 | * we are not guaranteed to have set the association id of the real | |
1897 | * association and so these notifications need to be delayed until | |
1898 | * the association id is allocated. | |
1da177e4 | 1899 | */ |
1da177e4 | 1900 | |
07d93967 | 1901 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_CHANGE, SCTP_U8(SCTP_COMM_UP)); |
1da177e4 LT |
1902 | |
1903 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1904 | * When a peer sends a Adaptation Layer Indication parameter , SCTP |
1da177e4 | 1905 | * delivers this notification to inform the application that of the |
0f3fffd8 | 1906 | * peers requested adaptation layer. |
07d93967 VY |
1907 | * |
1908 | * This also needs to be done as a side effect for the same reason as | |
1909 | * above. | |
1da177e4 | 1910 | */ |
07d93967 VY |
1911 | if (asoc->peer.adaptation_ind) |
1912 | sctp_add_cmd_sf(commands, SCTP_CMD_ADAPTATION_IND, SCTP_NULL()); | |
1da177e4 LT |
1913 | |
1914 | return SCTP_DISPOSITION_CONSUME; | |
1915 | ||
1da177e4 LT |
1916 | nomem: |
1917 | return SCTP_DISPOSITION_NOMEM; | |
1918 | } | |
1919 | ||
1920 | /* Unexpected COOKIE-ECHO handler for setup collision (Table 2, action 'C') | |
1921 | * | |
1922 | * Section 5.2.4 | |
1923 | * C) In this case, the local endpoint's cookie has arrived late. | |
1924 | * Before it arrived, the local endpoint sent an INIT and received an | |
1925 | * INIT-ACK and finally sent a COOKIE ECHO with the peer's same tag | |
1926 | * but a new tag of its own. | |
1927 | */ | |
1928 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1929 | static enum sctp_disposition sctp_sf_do_dupcook_c( |
1930 | struct net *net, | |
24cb81a6 | 1931 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1932 | const struct sctp_association *asoc, |
1933 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1934 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1935 | struct sctp_association *new_asoc) |
1936 | { | |
1937 | /* The cookie should be silently discarded. | |
1938 | * The endpoint SHOULD NOT change states and should leave | |
1939 | * any timers running. | |
1940 | */ | |
1941 | return SCTP_DISPOSITION_DISCARD; | |
1942 | } | |
1943 | ||
1944 | /* Unexpected COOKIE-ECHO handler lost chunk (Table 2, action 'D') | |
1945 | * | |
1946 | * Section 5.2.4 | |
1947 | * | |
1948 | * D) When both local and remote tags match the endpoint should always | |
1949 | * enter the ESTABLISHED state, if it has not already done so. | |
1950 | */ | |
1951 | /* This case represents an initialization collision. */ | |
172a1599 XL |
1952 | static enum sctp_disposition sctp_sf_do_dupcook_d( |
1953 | struct net *net, | |
24cb81a6 | 1954 | const struct sctp_endpoint *ep, |
1da177e4 LT |
1955 | const struct sctp_association *asoc, |
1956 | struct sctp_chunk *chunk, | |
a85bbeb2 | 1957 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
1958 | struct sctp_association *new_asoc) |
1959 | { | |
df7deeb5 | 1960 | struct sctp_ulpevent *ev = NULL, *ai_ev = NULL; |
1da177e4 LT |
1961 | struct sctp_chunk *repl; |
1962 | ||
1963 | /* Clarification from Implementor's Guide: | |
1964 | * D) When both local and remote tags match the endpoint should | |
d808ad9a YH |
1965 | * enter the ESTABLISHED state, if it is in the COOKIE-ECHOED state. |
1966 | * It should stop any cookie timer that may be running and send | |
1967 | * a COOKIE ACK. | |
1da177e4 LT |
1968 | */ |
1969 | ||
3b54f1fd XL |
1970 | if (!sctp_auth_chunk_verify(net, chunk, asoc)) |
1971 | return SCTP_DISPOSITION_DISCARD; | |
1972 | ||
1da177e4 LT |
1973 | /* Don't accidentally move back into established state. */ |
1974 | if (asoc->state < SCTP_STATE_ESTABLISHED) { | |
1975 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
1976 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
1977 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
1978 | SCTP_STATE(SCTP_STATE_ESTABLISHED)); | |
24cb81a6 | 1979 | SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB); |
1da177e4 LT |
1980 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, |
1981 | SCTP_NULL()); | |
1982 | ||
1983 | /* RFC 2960 5.1 Normal Establishment of an Association | |
1984 | * | |
1985 | * D) IMPLEMENTATION NOTE: An implementation may choose | |
1986 | * to send the Communication Up notification to the | |
1987 | * SCTP user upon reception of a valid COOKIE | |
1988 | * ECHO chunk. | |
1989 | */ | |
df7deeb5 | 1990 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, |
1da177e4 | 1991 | SCTP_COMM_UP, 0, |
df7deeb5 VY |
1992 | asoc->c.sinit_num_ostreams, |
1993 | asoc->c.sinit_max_instreams, | |
9cbcbf4e | 1994 | NULL, GFP_ATOMIC); |
1da177e4 LT |
1995 | if (!ev) |
1996 | goto nomem; | |
1da177e4 LT |
1997 | |
1998 | /* Sockets API Draft Section 5.3.1.6 | |
0f3fffd8 | 1999 | * When a peer sends a Adaptation Layer Indication parameter, |
1da177e4 | 2000 | * SCTP delivers this notification to inform the application |
0f3fffd8 | 2001 | * that of the peers requested adaptation layer. |
1da177e4 | 2002 | */ |
0f3fffd8 ISJ |
2003 | if (asoc->peer.adaptation_ind) { |
2004 | ai_ev = sctp_ulpevent_make_adaptation_indication(asoc, | |
1da177e4 | 2005 | GFP_ATOMIC); |
df7deeb5 | 2006 | if (!ai_ev) |
1da177e4 LT |
2007 | goto nomem; |
2008 | ||
1da177e4 LT |
2009 | } |
2010 | } | |
1da177e4 | 2011 | |
bf2f3bae | 2012 | repl = sctp_make_cookie_ack(asoc, chunk); |
1da177e4 LT |
2013 | if (!repl) |
2014 | goto nomem; | |
2015 | ||
2e3216cd VY |
2016 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
2017 | ||
df7deeb5 VY |
2018 | if (ev) |
2019 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2020 | SCTP_ULPEVENT(ev)); | |
2021 | if (ai_ev) | |
2022 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
2023 | SCTP_ULPEVENT(ai_ev)); | |
2024 | ||
1da177e4 LT |
2025 | return SCTP_DISPOSITION_CONSUME; |
2026 | ||
2027 | nomem: | |
df7deeb5 VY |
2028 | if (ai_ev) |
2029 | sctp_ulpevent_free(ai_ev); | |
1da177e4 LT |
2030 | if (ev) |
2031 | sctp_ulpevent_free(ev); | |
2032 | return SCTP_DISPOSITION_NOMEM; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * Handle a duplicate COOKIE-ECHO. This usually means a cookie-carrying | |
2037 | * chunk was retransmitted and then delayed in the network. | |
2038 | * | |
2039 | * Section: 5.2.4 Handle a COOKIE ECHO when a TCB exists | |
2040 | * | |
2041 | * Verification Tag: None. Do cookie validation. | |
2042 | * | |
2043 | * Inputs | |
2044 | * (endpoint, asoc, chunk) | |
2045 | * | |
2046 | * Outputs | |
2047 | * (asoc, reply_msg, msg_up, timers, counters) | |
2048 | * | |
2049 | * The return value is the disposition of the chunk. | |
2050 | */ | |
172a1599 XL |
2051 | enum sctp_disposition sctp_sf_do_5_2_4_dupcook( |
2052 | struct net *net, | |
24cb81a6 | 2053 | const struct sctp_endpoint *ep, |
1da177e4 | 2054 | const struct sctp_association *asoc, |
bfc6f827 | 2055 | const union sctp_subtype type, |
1da177e4 | 2056 | void *arg, |
a85bbeb2 | 2057 | struct sctp_cmd_seq *commands) |
1da177e4 | 2058 | { |
1da177e4 | 2059 | struct sctp_association *new_asoc; |
172a1599 XL |
2060 | struct sctp_chunk *chunk = arg; |
2061 | enum sctp_disposition retval; | |
2062 | struct sctp_chunk *err_chk_p; | |
1da177e4 LT |
2063 | int error = 0; |
2064 | char action; | |
1da177e4 LT |
2065 | |
2066 | /* Make sure that the chunk has a valid length from the protocol | |
2067 | * perspective. In this case check to make sure we have at least | |
2068 | * enough for the chunk header. Cookie length verification is | |
2069 | * done later. | |
2070 | */ | |
922dbc5b | 2071 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2072 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2073 | commands); |
2074 | ||
2075 | /* "Decode" the chunk. We have no optional parameters so we | |
2076 | * are in good shape. | |
2077 | */ | |
d808ad9a | 2078 | chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; |
62b08083 | 2079 | if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - |
922dbc5b | 2080 | sizeof(struct sctp_chunkhdr))) |
62b08083 | 2081 | goto nomem; |
1da177e4 LT |
2082 | |
2083 | /* In RFC 2960 5.2.4 3, if both Verification Tags in the State Cookie | |
2084 | * of a duplicate COOKIE ECHO match the Verification Tags of the | |
2085 | * current association, consider the State Cookie valid even if | |
2086 | * the lifespan is exceeded. | |
2087 | */ | |
2088 | new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, | |
2089 | &err_chk_p); | |
2090 | ||
2091 | /* FIXME: | |
2092 | * If the re-build failed, what is the proper error path | |
2093 | * from here? | |
2094 | * | |
2095 | * [We should abort the association. --piggy] | |
2096 | */ | |
2097 | if (!new_asoc) { | |
2098 | /* FIXME: Several errors are possible. A bad cookie should | |
2099 | * be silently discarded, but think about logging it too. | |
2100 | */ | |
2101 | switch (error) { | |
2102 | case -SCTP_IERROR_NOMEM: | |
2103 | goto nomem; | |
2104 | ||
2105 | case -SCTP_IERROR_STALE_COOKIE: | |
24cb81a6 | 2106 | sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, |
1da177e4 | 2107 | err_chk_p); |
24cb81a6 | 2108 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2109 | case -SCTP_IERROR_BAD_SIG: |
2110 | default: | |
24cb81a6 | 2111 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3ff50b79 | 2112 | } |
1da177e4 LT |
2113 | } |
2114 | ||
7e062977 XL |
2115 | /* Set temp so that it won't be added into hashtable */ |
2116 | new_asoc->temp = 1; | |
2117 | ||
1da177e4 LT |
2118 | /* Compare the tie_tag in cookie with the verification tag of |
2119 | * current association. | |
2120 | */ | |
2121 | action = sctp_tietags_compare(new_asoc, asoc); | |
2122 | ||
2123 | switch (action) { | |
2124 | case 'A': /* Association restart. */ | |
24cb81a6 | 2125 | retval = sctp_sf_do_dupcook_a(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2126 | new_asoc); |
2127 | break; | |
2128 | ||
2129 | case 'B': /* Collision case B. */ | |
24cb81a6 | 2130 | retval = sctp_sf_do_dupcook_b(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2131 | new_asoc); |
2132 | break; | |
2133 | ||
2134 | case 'C': /* Collision case C. */ | |
24cb81a6 | 2135 | retval = sctp_sf_do_dupcook_c(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2136 | new_asoc); |
2137 | break; | |
2138 | ||
2139 | case 'D': /* Collision case D. */ | |
24cb81a6 | 2140 | retval = sctp_sf_do_dupcook_d(net, ep, asoc, chunk, commands, |
1da177e4 LT |
2141 | new_asoc); |
2142 | break; | |
2143 | ||
2144 | default: /* Discard packet for all others. */ | |
24cb81a6 | 2145 | retval = sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2146 | break; |
3ff50b79 | 2147 | } |
1da177e4 LT |
2148 | |
2149 | /* Delete the tempory new association. */ | |
f2815633 | 2150 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, SCTP_ASOC(new_asoc)); |
1da177e4 LT |
2151 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
2152 | ||
d5ccd496 MM |
2153 | /* Restore association pointer to provide SCTP command interpeter |
2154 | * with a valid context in case it needs to manipulate | |
2155 | * the queues */ | |
2156 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_ASOC, | |
2157 | SCTP_ASOC((struct sctp_association *)asoc)); | |
2158 | ||
1da177e4 LT |
2159 | return retval; |
2160 | ||
2161 | nomem: | |
2162 | return SCTP_DISPOSITION_NOMEM; | |
2163 | } | |
2164 | ||
2165 | /* | |
2166 | * Process an ABORT. (SHUTDOWN-PENDING state) | |
2167 | * | |
2168 | * See sctp_sf_do_9_1_abort(). | |
2169 | */ | |
172a1599 XL |
2170 | enum sctp_disposition sctp_sf_shutdown_pending_abort( |
2171 | struct net *net, | |
2172 | const struct sctp_endpoint *ep, | |
2173 | const struct sctp_association *asoc, | |
2174 | const union sctp_subtype type, | |
2175 | void *arg, | |
2176 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2177 | { |
2178 | struct sctp_chunk *chunk = arg; | |
2179 | ||
2180 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2181 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2182 | |
2183 | /* Make sure that the ABORT chunk has a valid length. | |
2184 | * Since this is an ABORT chunk, we have to discard it | |
2185 | * because of the following text: | |
2186 | * RFC 2960, Section 3.3.7 | |
2187 | * If an endpoint receives an ABORT with a format error or for an | |
2188 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2189 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2190 | * as we do not know its true length. So, to be safe, discard the |
2191 | * packet. | |
2192 | */ | |
441ae65a | 2193 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2194 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2195 | |
75205f47 VY |
2196 | /* ADD-IP: Special case for ABORT chunks |
2197 | * F4) One special consideration is that ABORT Chunks arriving | |
2198 | * destined to the IP address being deleted MUST be | |
2199 | * ignored (see Section 5.3.1 for further details). | |
2200 | */ | |
2201 | if (SCTP_ADDR_DEL == | |
2202 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2203 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2204 | |
24cb81a6 | 2205 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2206 | } |
2207 | ||
2208 | /* | |
2209 | * Process an ABORT. (SHUTDOWN-SENT state) | |
2210 | * | |
2211 | * See sctp_sf_do_9_1_abort(). | |
2212 | */ | |
172a1599 XL |
2213 | enum sctp_disposition sctp_sf_shutdown_sent_abort( |
2214 | struct net *net, | |
24cb81a6 | 2215 | const struct sctp_endpoint *ep, |
1da177e4 | 2216 | const struct sctp_association *asoc, |
bfc6f827 | 2217 | const union sctp_subtype type, |
1da177e4 | 2218 | void *arg, |
a85bbeb2 | 2219 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2220 | { |
2221 | struct sctp_chunk *chunk = arg; | |
2222 | ||
2223 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2224 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2225 | |
2226 | /* Make sure that the ABORT chunk has a valid length. | |
2227 | * Since this is an ABORT chunk, we have to discard it | |
2228 | * because of the following text: | |
2229 | * RFC 2960, Section 3.3.7 | |
2230 | * If an endpoint receives an ABORT with a format error or for an | |
2231 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2232 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2233 | * as we do not know its true length. So, to be safe, discard the |
2234 | * packet. | |
2235 | */ | |
441ae65a | 2236 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2237 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2238 | |
75205f47 VY |
2239 | /* ADD-IP: Special case for ABORT chunks |
2240 | * F4) One special consideration is that ABORT Chunks arriving | |
2241 | * destined to the IP address being deleted MUST be | |
2242 | * ignored (see Section 5.3.1 for further details). | |
2243 | */ | |
2244 | if (SCTP_ADDR_DEL == | |
2245 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2246 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2247 | |
1da177e4 LT |
2248 | /* Stop the T2-shutdown timer. */ |
2249 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2250 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2251 | ||
2252 | /* Stop the T5-shutdown guard timer. */ | |
2253 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2254 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
2255 | ||
24cb81a6 | 2256 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2257 | } |
2258 | ||
2259 | /* | |
2260 | * Process an ABORT. (SHUTDOWN-ACK-SENT state) | |
2261 | * | |
2262 | * See sctp_sf_do_9_1_abort(). | |
2263 | */ | |
172a1599 XL |
2264 | enum sctp_disposition sctp_sf_shutdown_ack_sent_abort( |
2265 | struct net *net, | |
2266 | const struct sctp_endpoint *ep, | |
2267 | const struct sctp_association *asoc, | |
2268 | const union sctp_subtype type, | |
2269 | void *arg, | |
2270 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2271 | { |
2272 | /* The same T2 timer, so we should be able to use | |
2273 | * common function with the SHUTDOWN-SENT state. | |
2274 | */ | |
24cb81a6 | 2275 | return sctp_sf_shutdown_sent_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2276 | } |
2277 | ||
2278 | /* | |
2279 | * Handle an Error received in COOKIE_ECHOED state. | |
2280 | * | |
2281 | * Only handle the error type of stale COOKIE Error, the other errors will | |
2282 | * be ignored. | |
2283 | * | |
2284 | * Inputs | |
2285 | * (endpoint, asoc, chunk) | |
2286 | * | |
2287 | * Outputs | |
2288 | * (asoc, reply_msg, msg_up, timers, counters) | |
2289 | * | |
2290 | * The return value is the disposition of the chunk. | |
2291 | */ | |
172a1599 XL |
2292 | enum sctp_disposition sctp_sf_cookie_echoed_err( |
2293 | struct net *net, | |
24cb81a6 | 2294 | const struct sctp_endpoint *ep, |
1da177e4 | 2295 | const struct sctp_association *asoc, |
bfc6f827 | 2296 | const union sctp_subtype type, |
1da177e4 | 2297 | void *arg, |
a85bbeb2 | 2298 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2299 | { |
2300 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 2301 | struct sctp_errhdr *err; |
1da177e4 LT |
2302 | |
2303 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2304 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2305 | |
2306 | /* Make sure that the ERROR chunk has a valid length. | |
2307 | * The parameter walking depends on this as well. | |
2308 | */ | |
87caeba7 | 2309 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 2310 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2311 | commands); |
2312 | ||
2313 | /* Process the error here */ | |
2314 | /* FUTURE FIXME: When PR-SCTP related and other optional | |
2315 | * parms are emitted, this will have to change to handle multiple | |
2316 | * errors. | |
2317 | */ | |
2318 | sctp_walk_errors(err, chunk->chunk_hdr) { | |
2319 | if (SCTP_ERROR_STALE_COOKIE == err->cause) | |
24cb81a6 | 2320 | return sctp_sf_do_5_2_6_stale(net, ep, asoc, type, |
1da177e4 LT |
2321 | arg, commands); |
2322 | } | |
2323 | ||
2324 | /* It is possible to have malformed error causes, and that | |
2325 | * will cause us to end the walk early. However, since | |
2326 | * we are discarding the packet, there should be no adverse | |
2327 | * affects. | |
2328 | */ | |
24cb81a6 | 2329 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2330 | } |
2331 | ||
2332 | /* | |
2333 | * Handle a Stale COOKIE Error | |
2334 | * | |
2335 | * Section: 5.2.6 Handle Stale COOKIE Error | |
2336 | * If the association is in the COOKIE-ECHOED state, the endpoint may elect | |
2337 | * one of the following three alternatives. | |
2338 | * ... | |
2339 | * 3) Send a new INIT chunk to the endpoint, adding a Cookie | |
2340 | * Preservative parameter requesting an extension to the lifetime of | |
2341 | * the State Cookie. When calculating the time extension, an | |
2342 | * implementation SHOULD use the RTT information measured based on the | |
2343 | * previous COOKIE ECHO / ERROR exchange, and should add no more | |
2344 | * than 1 second beyond the measured RTT, due to long State Cookie | |
2345 | * lifetimes making the endpoint more subject to a replay attack. | |
2346 | * | |
2347 | * Verification Tag: Not explicit, but safe to ignore. | |
2348 | * | |
2349 | * Inputs | |
2350 | * (endpoint, asoc, chunk) | |
2351 | * | |
2352 | * Outputs | |
2353 | * (asoc, reply_msg, msg_up, timers, counters) | |
2354 | * | |
2355 | * The return value is the disposition of the chunk. | |
2356 | */ | |
172a1599 XL |
2357 | static enum sctp_disposition sctp_sf_do_5_2_6_stale( |
2358 | struct net *net, | |
2359 | const struct sctp_endpoint *ep, | |
2360 | const struct sctp_association *asoc, | |
2361 | const union sctp_subtype type, | |
2362 | void *arg, | |
2363 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2364 | { |
3f7a87d2 | 2365 | int attempts = asoc->init_err_counter + 1; |
365ddb65 XL |
2366 | struct sctp_chunk *chunk = arg, *reply; |
2367 | struct sctp_cookie_preserve_param bht; | |
2368 | struct sctp_bind_addr *bp; | |
d8238d9d | 2369 | struct sctp_errhdr *err; |
365ddb65 | 2370 | u32 stale; |
1da177e4 | 2371 | |
81845c21 | 2372 | if (attempts > asoc->max_init_attempts) { |
8de8c873 SS |
2373 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
2374 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 2375 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 2376 | SCTP_PERR(SCTP_ERROR_STALE_COOKIE)); |
1da177e4 LT |
2377 | return SCTP_DISPOSITION_DELETE_TCB; |
2378 | } | |
2379 | ||
d8238d9d | 2380 | err = (struct sctp_errhdr *)(chunk->skb->data); |
1da177e4 LT |
2381 | |
2382 | /* When calculating the time extension, an implementation | |
2383 | * SHOULD use the RTT information measured based on the | |
2384 | * previous COOKIE ECHO / ERROR exchange, and should add no | |
2385 | * more than 1 second beyond the measured RTT, due to long | |
2386 | * State Cookie lifetimes making the endpoint more subject to | |
2387 | * a replay attack. | |
2388 | * Measure of Staleness's unit is usec. (1/1000000 sec) | |
2389 | * Suggested Cookie Life-span Increment's unit is msec. | |
2390 | * (1/1000 sec) | |
2391 | * In general, if you use the suggested cookie life, the value | |
2392 | * found in the field of measure of staleness should be doubled | |
2393 | * to give ample time to retransmit the new cookie and thus | |
2394 | * yield a higher probability of success on the reattempt. | |
2395 | */ | |
d8238d9d | 2396 | stale = ntohl(*(__be32 *)((u8 *)err + sizeof(*err))); |
1da177e4 LT |
2397 | stale = (stale * 2) / 1000; |
2398 | ||
2399 | bht.param_hdr.type = SCTP_PARAM_COOKIE_PRESERVATIVE; | |
2400 | bht.param_hdr.length = htons(sizeof(bht)); | |
2401 | bht.lifespan_increment = htonl(stale); | |
2402 | ||
2403 | /* Build that new INIT chunk. */ | |
2404 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; | |
2405 | reply = sctp_make_init(asoc, bp, GFP_ATOMIC, sizeof(bht)); | |
2406 | if (!reply) | |
2407 | goto nomem; | |
2408 | ||
2409 | sctp_addto_chunk(reply, sizeof(bht), &bht); | |
2410 | ||
2411 | /* Clear peer's init_tag cached in assoc as we are sending a new INIT */ | |
2412 | sctp_add_cmd_sf(commands, SCTP_CMD_CLEAR_INIT_TAG, SCTP_NULL()); | |
2413 | ||
2414 | /* Stop pending T3-rtx and heartbeat timers */ | |
2415 | sctp_add_cmd_sf(commands, SCTP_CMD_T3_RTX_TIMERS_STOP, SCTP_NULL()); | |
2416 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
2417 | ||
2418 | /* Delete non-primary peer ip addresses since we are transitioning | |
2419 | * back to the COOKIE-WAIT state | |
2420 | */ | |
2421 | sctp_add_cmd_sf(commands, SCTP_CMD_DEL_NON_PRIMARY, SCTP_NULL()); | |
2422 | ||
d808ad9a YH |
2423 | /* If we've sent any data bundled with COOKIE-ECHO we will need to |
2424 | * resend | |
1da177e4 | 2425 | */ |
b6157d8e | 2426 | sctp_add_cmd_sf(commands, SCTP_CMD_T1_RETRAN, |
1da177e4 LT |
2427 | SCTP_TRANSPORT(asoc->peer.primary_path)); |
2428 | ||
2429 | /* Cast away the const modifier, as we want to just | |
2430 | * rerun it through as a sideffect. | |
2431 | */ | |
3f7a87d2 | 2432 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL()); |
1da177e4 LT |
2433 | |
2434 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
2435 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
2436 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2437 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
2438 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
2439 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
2440 | ||
2441 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2442 | ||
2443 | return SCTP_DISPOSITION_CONSUME; | |
2444 | ||
2445 | nomem: | |
2446 | return SCTP_DISPOSITION_NOMEM; | |
2447 | } | |
2448 | ||
2449 | /* | |
2450 | * Process an ABORT. | |
2451 | * | |
2452 | * Section: 9.1 | |
2453 | * After checking the Verification Tag, the receiving endpoint shall | |
2454 | * remove the association from its record, and shall report the | |
2455 | * termination to its upper layer. | |
2456 | * | |
2457 | * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules | |
2458 | * B) Rules for packet carrying ABORT: | |
2459 | * | |
2460 | * - The endpoint shall always fill in the Verification Tag field of the | |
2461 | * outbound packet with the destination endpoint's tag value if it | |
2462 | * is known. | |
2463 | * | |
2464 | * - If the ABORT is sent in response to an OOTB packet, the endpoint | |
2465 | * MUST follow the procedure described in Section 8.4. | |
2466 | * | |
2467 | * - The receiver MUST accept the packet if the Verification Tag | |
2468 | * matches either its own tag, OR the tag of its peer. Otherwise, the | |
2469 | * receiver MUST silently discard the packet and take no further | |
2470 | * action. | |
2471 | * | |
2472 | * Inputs | |
2473 | * (endpoint, asoc, chunk) | |
2474 | * | |
2475 | * Outputs | |
2476 | * (asoc, reply_msg, msg_up, timers, counters) | |
2477 | * | |
2478 | * The return value is the disposition of the chunk. | |
2479 | */ | |
172a1599 XL |
2480 | enum sctp_disposition sctp_sf_do_9_1_abort( |
2481 | struct net *net, | |
24cb81a6 | 2482 | const struct sctp_endpoint *ep, |
1da177e4 | 2483 | const struct sctp_association *asoc, |
bfc6f827 | 2484 | const union sctp_subtype type, |
1da177e4 | 2485 | void *arg, |
a85bbeb2 | 2486 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
2487 | { |
2488 | struct sctp_chunk *chunk = arg; | |
1da177e4 LT |
2489 | |
2490 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2491 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2492 | |
2493 | /* Make sure that the ABORT chunk has a valid length. | |
2494 | * Since this is an ABORT chunk, we have to discard it | |
2495 | * because of the following text: | |
2496 | * RFC 2960, Section 3.3.7 | |
2497 | * If an endpoint receives an ABORT with a format error or for an | |
2498 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2499 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2500 | * as we do not know its true length. So, to be safe, discard the |
2501 | * packet. | |
2502 | */ | |
441ae65a | 2503 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2504 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2505 | |
75205f47 VY |
2506 | /* ADD-IP: Special case for ABORT chunks |
2507 | * F4) One special consideration is that ABORT Chunks arriving | |
2508 | * destined to the IP address being deleted MUST be | |
2509 | * ignored (see Section 5.3.1 for further details). | |
2510 | */ | |
2511 | if (SCTP_ADDR_DEL == | |
2512 | sctp_bind_addr_state(&asoc->base.bind_addr, &chunk->dest)) | |
24cb81a6 | 2513 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, commands); |
75205f47 | 2514 | |
24cb81a6 | 2515 | return __sctp_sf_do_9_1_abort(net, ep, asoc, type, arg, commands); |
75205f47 VY |
2516 | } |
2517 | ||
172a1599 XL |
2518 | static enum sctp_disposition __sctp_sf_do_9_1_abort( |
2519 | struct net *net, | |
24cb81a6 | 2520 | const struct sctp_endpoint *ep, |
75205f47 | 2521 | const struct sctp_association *asoc, |
bfc6f827 | 2522 | const union sctp_subtype type, |
75205f47 | 2523 | void *arg, |
a85bbeb2 | 2524 | struct sctp_cmd_seq *commands) |
75205f47 | 2525 | { |
172a1599 | 2526 | __be16 error = SCTP_ERROR_NO_ERROR; |
75205f47 | 2527 | struct sctp_chunk *chunk = arg; |
95c96174 | 2528 | unsigned int len; |
75205f47 | 2529 | |
1da177e4 LT |
2530 | /* See if we have an error cause code in the chunk. */ |
2531 | len = ntohs(chunk->chunk_hdr->length); | |
96ca468b | 2532 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) { |
d8238d9d | 2533 | struct sctp_errhdr *err; |
96ca468b | 2534 | |
96ca468b SW |
2535 | sctp_walk_errors(err, chunk->chunk_hdr); |
2536 | if ((void *)err != (void *)chunk->chunk_end) | |
d8238d9d XL |
2537 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
2538 | commands); | |
96ca468b | 2539 | |
d8238d9d | 2540 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
96ca468b | 2541 | } |
1da177e4 | 2542 | |
8de8c873 | 2543 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET)); |
d808ad9a | 2544 | /* ASSOC_FAILED will DELETE_TCB. */ |
5be291fe | 2545 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, SCTP_PERR(error)); |
b01a2407 EB |
2546 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
2547 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
2548 | |
2549 | return SCTP_DISPOSITION_ABORT; | |
2550 | } | |
2551 | ||
2552 | /* | |
2553 | * Process an ABORT. (COOKIE-WAIT state) | |
2554 | * | |
2555 | * See sctp_sf_do_9_1_abort() above. | |
2556 | */ | |
172a1599 XL |
2557 | enum sctp_disposition sctp_sf_cookie_wait_abort( |
2558 | struct net *net, | |
2559 | const struct sctp_endpoint *ep, | |
2560 | const struct sctp_association *asoc, | |
2561 | const union sctp_subtype type, | |
2562 | void *arg, | |
2563 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2564 | { |
172a1599 | 2565 | __be16 error = SCTP_ERROR_NO_ERROR; |
1da177e4 | 2566 | struct sctp_chunk *chunk = arg; |
95c96174 | 2567 | unsigned int len; |
1da177e4 LT |
2568 | |
2569 | if (!sctp_vtag_verify_either(chunk, asoc)) | |
24cb81a6 | 2570 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2571 | |
2572 | /* Make sure that the ABORT chunk has a valid length. | |
2573 | * Since this is an ABORT chunk, we have to discard it | |
2574 | * because of the following text: | |
2575 | * RFC 2960, Section 3.3.7 | |
2576 | * If an endpoint receives an ABORT with a format error or for an | |
2577 | * association that doesn't exist, it MUST silently discard it. | |
25985edc | 2578 | * Because the length is "invalid", we can't really discard just |
1da177e4 LT |
2579 | * as we do not know its true length. So, to be safe, discard the |
2580 | * packet. | |
2581 | */ | |
441ae65a | 2582 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_abort_chunk))) |
24cb81a6 | 2583 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2584 | |
2585 | /* See if we have an error cause code in the chunk. */ | |
2586 | len = ntohs(chunk->chunk_hdr->length); | |
2587 | if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) | |
d8238d9d | 2588 | error = ((struct sctp_errhdr *)chunk->skb->data)->cause; |
1da177e4 | 2589 | |
24cb81a6 | 2590 | return sctp_stop_t1_and_abort(net, commands, error, ECONNREFUSED, asoc, |
8de8c873 | 2591 | chunk->transport); |
1da177e4 LT |
2592 | } |
2593 | ||
2594 | /* | |
2595 | * Process an incoming ICMP as an ABORT. (COOKIE-WAIT state) | |
2596 | */ | |
172a1599 XL |
2597 | enum sctp_disposition sctp_sf_cookie_wait_icmp_abort( |
2598 | struct net *net, | |
24cb81a6 | 2599 | const struct sctp_endpoint *ep, |
1da177e4 | 2600 | const struct sctp_association *asoc, |
bfc6f827 | 2601 | const union sctp_subtype type, |
1da177e4 | 2602 | void *arg, |
a85bbeb2 | 2603 | struct sctp_cmd_seq *commands) |
1da177e4 | 2604 | { |
24cb81a6 | 2605 | return sctp_stop_t1_and_abort(net, commands, SCTP_ERROR_NO_ERROR, |
8de8c873 | 2606 | ENOPROTOOPT, asoc, |
3f7a87d2 | 2607 | (struct sctp_transport *)arg); |
1da177e4 LT |
2608 | } |
2609 | ||
2610 | /* | |
2611 | * Process an ABORT. (COOKIE-ECHOED state) | |
2612 | */ | |
172a1599 XL |
2613 | enum sctp_disposition sctp_sf_cookie_echoed_abort( |
2614 | struct net *net, | |
2615 | const struct sctp_endpoint *ep, | |
2616 | const struct sctp_association *asoc, | |
2617 | const union sctp_subtype type, | |
2618 | void *arg, | |
2619 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
2620 | { |
2621 | /* There is a single T1 timer, so we should be able to use | |
2622 | * common function with the COOKIE-WAIT state. | |
2623 | */ | |
24cb81a6 | 2624 | return sctp_sf_cookie_wait_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2625 | } |
2626 | ||
2627 | /* | |
2628 | * Stop T1 timer and abort association with "INIT failed". | |
2629 | * | |
2630 | * This is common code called by several sctp_sf_*_abort() functions above. | |
2631 | */ | |
172a1599 XL |
2632 | static enum sctp_disposition sctp_stop_t1_and_abort( |
2633 | struct net *net, | |
2634 | struct sctp_cmd_seq *commands, | |
2635 | __be16 error, int sk_err, | |
2636 | const struct sctp_association *asoc, | |
2637 | struct sctp_transport *transport) | |
1da177e4 | 2638 | { |
bb33381d DB |
2639 | pr_debug("%s: ABORT received (INIT)\n", __func__); |
2640 | ||
1da177e4 LT |
2641 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
2642 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
24cb81a6 | 2643 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
2644 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
2645 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
8de8c873 | 2646 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(sk_err)); |
1da177e4 LT |
2647 | /* CMD_INIT_FAILED will DELETE_TCB. */ |
2648 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 2649 | SCTP_PERR(error)); |
bb33381d | 2650 | |
3f7a87d2 | 2651 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
2652 | } |
2653 | ||
2654 | /* | |
2655 | * sctp_sf_do_9_2_shut | |
2656 | * | |
2657 | * Section: 9.2 | |
2658 | * Upon the reception of the SHUTDOWN, the peer endpoint shall | |
2659 | * - enter the SHUTDOWN-RECEIVED state, | |
2660 | * | |
2661 | * - stop accepting new data from its SCTP user | |
2662 | * | |
2663 | * - verify, by checking the Cumulative TSN Ack field of the chunk, | |
2664 | * that all its outstanding DATA chunks have been received by the | |
2665 | * SHUTDOWN sender. | |
2666 | * | |
2667 | * Once an endpoint as reached the SHUTDOWN-RECEIVED state it MUST NOT | |
2668 | * send a SHUTDOWN in response to a ULP request. And should discard | |
2669 | * subsequent SHUTDOWN chunks. | |
2670 | * | |
2671 | * If there are still outstanding DATA chunks left, the SHUTDOWN | |
2672 | * receiver shall continue to follow normal data transmission | |
2673 | * procedures defined in Section 6 until all outstanding DATA chunks | |
2674 | * are acknowledged; however, the SHUTDOWN receiver MUST NOT accept | |
2675 | * new data from its SCTP user. | |
2676 | * | |
2677 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2678 | * | |
2679 | * Inputs | |
2680 | * (endpoint, asoc, chunk) | |
2681 | * | |
2682 | * Outputs | |
2683 | * (asoc, reply_msg, msg_up, timers, counters) | |
2684 | * | |
2685 | * The return value is the disposition of the chunk. | |
2686 | */ | |
172a1599 XL |
2687 | enum sctp_disposition sctp_sf_do_9_2_shutdown( |
2688 | struct net *net, | |
2689 | const struct sctp_endpoint *ep, | |
2690 | const struct sctp_association *asoc, | |
2691 | const union sctp_subtype type, | |
2692 | void *arg, | |
2693 | struct sctp_cmd_seq *commands) | |
2694 | { | |
2695 | enum sctp_disposition disposition; | |
1da177e4 | 2696 | struct sctp_chunk *chunk = arg; |
e61e4055 | 2697 | struct sctp_shutdownhdr *sdh; |
1da177e4 | 2698 | struct sctp_ulpevent *ev; |
df10eec4 | 2699 | __u32 ctsn; |
1da177e4 LT |
2700 | |
2701 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2702 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
2703 | |
2704 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2705 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2706 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2707 | commands); |
2708 | ||
2709 | /* Convert the elaborate header. */ | |
e61e4055 XL |
2710 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
2711 | skb_pull(chunk->skb, sizeof(*sdh)); | |
1da177e4 | 2712 | chunk->subh.shutdown_hdr = sdh; |
df10eec4 WY |
2713 | ctsn = ntohl(sdh->cum_tsn_ack); |
2714 | ||
a2f36eec | 2715 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { |
bb33381d DB |
2716 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2717 | asoc->ctsn_ack_point); | |
2718 | ||
a2f36eec WY |
2719 | return SCTP_DISPOSITION_DISCARD; |
2720 | } | |
2721 | ||
df10eec4 WY |
2722 | /* If Cumulative TSN Ack beyond the max tsn currently |
2723 | * send, terminating the association and respond to the | |
2724 | * sender with an ABORT. | |
2725 | */ | |
2726 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 2727 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
1da177e4 | 2728 | |
eb0e0076 SS |
2729 | /* API 5.3.1.5 SCTP_SHUTDOWN_EVENT |
2730 | * When a peer sends a SHUTDOWN, SCTP delivers this notification to | |
2731 | * inform the application that it should cease sending data. | |
2732 | */ | |
2733 | ev = sctp_ulpevent_make_shutdown_event(asoc, 0, GFP_ATOMIC); | |
2734 | if (!ev) { | |
2735 | disposition = SCTP_DISPOSITION_NOMEM; | |
d808ad9a | 2736 | goto out; |
eb0e0076 SS |
2737 | } |
2738 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); | |
2739 | ||
1da177e4 LT |
2740 | /* Upon the reception of the SHUTDOWN, the peer endpoint shall |
2741 | * - enter the SHUTDOWN-RECEIVED state, | |
2742 | * - stop accepting new data from its SCTP user | |
2743 | * | |
2744 | * [This is implicit in the new state.] | |
2745 | */ | |
2746 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
2747 | SCTP_STATE(SCTP_STATE_SHUTDOWN_RECEIVED)); | |
2748 | disposition = SCTP_DISPOSITION_CONSUME; | |
2749 | ||
2750 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 2751 | disposition = sctp_sf_do_9_2_shutdown_ack(net, ep, asoc, type, |
1da177e4 LT |
2752 | arg, commands); |
2753 | } | |
2754 | ||
2755 | if (SCTP_DISPOSITION_NOMEM == disposition) | |
2756 | goto out; | |
2757 | ||
2758 | /* - verify, by checking the Cumulative TSN Ack field of the | |
2759 | * chunk, that all its outstanding DATA chunks have been | |
2760 | * received by the SHUTDOWN sender. | |
2761 | */ | |
2762 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2178eda8 | 2763 | SCTP_BE32(chunk->subh.shutdown_hdr->cum_tsn_ack)); |
1da177e4 | 2764 | |
1da177e4 LT |
2765 | out: |
2766 | return disposition; | |
2767 | } | |
2768 | ||
2e3f92da WY |
2769 | /* |
2770 | * sctp_sf_do_9_2_shut_ctsn | |
2771 | * | |
2772 | * Once an endpoint has reached the SHUTDOWN-RECEIVED state, | |
2773 | * it MUST NOT send a SHUTDOWN in response to a ULP request. | |
2774 | * The Cumulative TSN Ack of the received SHUTDOWN chunk | |
2775 | * MUST be processed. | |
2776 | */ | |
172a1599 XL |
2777 | enum sctp_disposition sctp_sf_do_9_2_shut_ctsn( |
2778 | struct net *net, | |
2779 | const struct sctp_endpoint *ep, | |
2780 | const struct sctp_association *asoc, | |
2781 | const union sctp_subtype type, | |
2782 | void *arg, | |
2783 | struct sctp_cmd_seq *commands) | |
2e3f92da WY |
2784 | { |
2785 | struct sctp_chunk *chunk = arg; | |
e61e4055 | 2786 | struct sctp_shutdownhdr *sdh; |
a2f36eec | 2787 | __u32 ctsn; |
2e3f92da WY |
2788 | |
2789 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2790 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2791 | |
2792 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 | 2793 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_shutdown_chunk))) |
24cb81a6 | 2794 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
2e3f92da WY |
2795 | commands); |
2796 | ||
e61e4055 | 2797 | sdh = (struct sctp_shutdownhdr *)chunk->skb->data; |
a2f36eec WY |
2798 | ctsn = ntohl(sdh->cum_tsn_ack); |
2799 | ||
2800 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
2801 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
2802 | asoc->ctsn_ack_point); | |
2803 | ||
a2f36eec WY |
2804 | return SCTP_DISPOSITION_DISCARD; |
2805 | } | |
2e3f92da WY |
2806 | |
2807 | /* If Cumulative TSN Ack beyond the max tsn currently | |
2808 | * send, terminating the association and respond to the | |
2809 | * sender with an ABORT. | |
2810 | */ | |
a2f36eec | 2811 | if (!TSN_lt(ctsn, asoc->next_tsn)) |
24cb81a6 | 2812 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
2e3f92da WY |
2813 | |
2814 | /* verify, by checking the Cumulative TSN Ack field of the | |
2815 | * chunk, that all its outstanding DATA chunks have been | |
2816 | * received by the SHUTDOWN sender. | |
2817 | */ | |
2818 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_CTSN, | |
2819 | SCTP_BE32(sdh->cum_tsn_ack)); | |
2820 | ||
2821 | return SCTP_DISPOSITION_CONSUME; | |
2822 | } | |
2823 | ||
1da177e4 LT |
2824 | /* RFC 2960 9.2 |
2825 | * If an endpoint is in SHUTDOWN-ACK-SENT state and receives an INIT chunk | |
2826 | * (e.g., if the SHUTDOWN COMPLETE was lost) with source and destination | |
2827 | * transport addresses (either in the IP addresses or in the INIT chunk) | |
2828 | * that belong to this association, it should discard the INIT chunk and | |
2829 | * retransmit the SHUTDOWN ACK chunk. | |
2830 | */ | |
172a1599 XL |
2831 | enum sctp_disposition sctp_sf_do_9_2_reshutack( |
2832 | struct net *net, | |
2833 | const struct sctp_endpoint *ep, | |
2834 | const struct sctp_association *asoc, | |
2835 | const union sctp_subtype type, | |
2836 | void *arg, | |
2837 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2838 | { |
172a1599 | 2839 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
2840 | struct sctp_chunk *reply; |
2841 | ||
ece25dfa | 2842 | /* Make sure that the chunk has a valid length */ |
922dbc5b | 2843 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 2844 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
2845 | commands); |
2846 | ||
1da177e4 LT |
2847 | /* Since we are not going to really process this INIT, there |
2848 | * is no point in verifying chunk boundries. Just generate | |
2849 | * the SHUTDOWN ACK. | |
2850 | */ | |
2851 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
2852 | if (NULL == reply) | |
2853 | goto nomem; | |
2854 | ||
2855 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
2856 | * the T2-SHUTDOWN timer. | |
2857 | */ | |
2858 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
2859 | ||
2860 | /* and restart the T2-shutdown timer. */ | |
2861 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
2862 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
2863 | ||
2864 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
2865 | ||
2866 | return SCTP_DISPOSITION_CONSUME; | |
2867 | nomem: | |
2868 | return SCTP_DISPOSITION_NOMEM; | |
2869 | } | |
2870 | ||
2871 | /* | |
2872 | * sctp_sf_do_ecn_cwr | |
2873 | * | |
2874 | * Section: Appendix A: Explicit Congestion Notification | |
2875 | * | |
2876 | * CWR: | |
2877 | * | |
2878 | * RFC 2481 details a specific bit for a sender to send in the header of | |
2879 | * its next outbound TCP segment to indicate to its peer that it has | |
2880 | * reduced its congestion window. This is termed the CWR bit. For | |
2881 | * SCTP the same indication is made by including the CWR chunk. | |
2882 | * This chunk contains one data element, i.e. the TSN number that | |
2883 | * was sent in the ECNE chunk. This element represents the lowest | |
2884 | * TSN number in the datagram that was originally marked with the | |
2885 | * CE bit. | |
2886 | * | |
2887 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2888 | * Inputs | |
2889 | * (endpoint, asoc, chunk) | |
2890 | * | |
2891 | * Outputs | |
2892 | * (asoc, reply_msg, msg_up, timers, counters) | |
2893 | * | |
2894 | * The return value is the disposition of the chunk. | |
2895 | */ | |
172a1599 XL |
2896 | enum sctp_disposition sctp_sf_do_ecn_cwr(struct net *net, |
2897 | const struct sctp_endpoint *ep, | |
2898 | const struct sctp_association *asoc, | |
2899 | const union sctp_subtype type, | |
2900 | void *arg, | |
2901 | struct sctp_cmd_seq *commands) | |
1da177e4 | 2902 | { |
1da177e4 | 2903 | struct sctp_chunk *chunk = arg; |
65f77105 | 2904 | struct sctp_cwrhdr *cwr; |
34bcca28 | 2905 | u32 lowest_tsn; |
1da177e4 LT |
2906 | |
2907 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2908 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2909 | |
b515fd27 | 2910 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2911 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 2912 | commands); |
d808ad9a | 2913 | |
65f77105 XL |
2914 | cwr = (struct sctp_cwrhdr *)chunk->skb->data; |
2915 | skb_pull(chunk->skb, sizeof(*cwr)); | |
1da177e4 | 2916 | |
34bcca28 | 2917 | lowest_tsn = ntohl(cwr->lowest_tsn); |
1da177e4 LT |
2918 | |
2919 | /* Does this CWR ack the last sent congestion notification? */ | |
34bcca28 | 2920 | if (TSN_lte(asoc->last_ecne_tsn, lowest_tsn)) { |
1da177e4 LT |
2921 | /* Stop sending ECNE. */ |
2922 | sctp_add_cmd_sf(commands, | |
2923 | SCTP_CMD_ECN_CWR, | |
34bcca28 | 2924 | SCTP_U32(lowest_tsn)); |
1da177e4 LT |
2925 | } |
2926 | return SCTP_DISPOSITION_CONSUME; | |
2927 | } | |
2928 | ||
2929 | /* | |
2930 | * sctp_sf_do_ecne | |
2931 | * | |
2932 | * Section: Appendix A: Explicit Congestion Notification | |
2933 | * | |
2934 | * ECN-Echo | |
2935 | * | |
2936 | * RFC 2481 details a specific bit for a receiver to send back in its | |
2937 | * TCP acknowledgements to notify the sender of the Congestion | |
2938 | * Experienced (CE) bit having arrived from the network. For SCTP this | |
2939 | * same indication is made by including the ECNE chunk. This chunk | |
2940 | * contains one data element, i.e. the lowest TSN associated with the IP | |
2941 | * datagram marked with the CE bit..... | |
2942 | * | |
2943 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2944 | * Inputs | |
2945 | * (endpoint, asoc, chunk) | |
2946 | * | |
2947 | * Outputs | |
2948 | * (asoc, reply_msg, msg_up, timers, counters) | |
2949 | * | |
2950 | * The return value is the disposition of the chunk. | |
2951 | */ | |
172a1599 XL |
2952 | enum sctp_disposition sctp_sf_do_ecne(struct net *net, |
2953 | const struct sctp_endpoint *ep, | |
2954 | const struct sctp_association *asoc, | |
2955 | const union sctp_subtype type, | |
2956 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 2957 | { |
1da177e4 | 2958 | struct sctp_chunk *chunk = arg; |
1fb6d83b | 2959 | struct sctp_ecnehdr *ecne; |
1da177e4 LT |
2960 | |
2961 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 2962 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 2963 | |
b515fd27 | 2964 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_ecne_chunk))) |
24cb81a6 | 2965 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
2966 | commands); |
2967 | ||
1fb6d83b XL |
2968 | ecne = (struct sctp_ecnehdr *)chunk->skb->data; |
2969 | skb_pull(chunk->skb, sizeof(*ecne)); | |
1da177e4 LT |
2970 | |
2971 | /* If this is a newer ECNE than the last CWR packet we sent out */ | |
2972 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_ECNE, | |
2973 | SCTP_U32(ntohl(ecne->lowest_tsn))); | |
2974 | ||
2975 | return SCTP_DISPOSITION_CONSUME; | |
2976 | } | |
2977 | ||
2978 | /* | |
2979 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
2980 | * | |
2981 | * The SCTP endpoint MUST always acknowledge the reception of each valid | |
2982 | * DATA chunk. | |
2983 | * | |
2984 | * The guidelines on delayed acknowledgement algorithm specified in | |
2985 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
2986 | * acknowledgement SHOULD be generated for at least every second packet | |
2987 | * (not every second DATA chunk) received, and SHOULD be generated within | |
2988 | * 200 ms of the arrival of any unacknowledged DATA chunk. In some | |
2989 | * situations it may be beneficial for an SCTP transmitter to be more | |
2990 | * conservative than the algorithms detailed in this document allow. | |
2991 | * However, an SCTP transmitter MUST NOT be more aggressive than the | |
2992 | * following algorithms allow. | |
2993 | * | |
2994 | * A SCTP receiver MUST NOT generate more than one SACK for every | |
2995 | * incoming packet, other than to update the offered window as the | |
2996 | * receiving application consumes new data. | |
2997 | * | |
2998 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
2999 | * | |
3000 | * Inputs | |
3001 | * (endpoint, asoc, chunk) | |
3002 | * | |
3003 | * Outputs | |
3004 | * (asoc, reply_msg, msg_up, timers, counters) | |
3005 | * | |
3006 | * The return value is the disposition of the chunk. | |
3007 | */ | |
172a1599 XL |
3008 | enum sctp_disposition sctp_sf_eat_data_6_2(struct net *net, |
3009 | const struct sctp_endpoint *ep, | |
3010 | const struct sctp_association *asoc, | |
3011 | const union sctp_subtype type, | |
3012 | void *arg, | |
3013 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3014 | { |
c488b770 | 3015 | union sctp_arg force = SCTP_NOFORCE(); |
1da177e4 LT |
3016 | struct sctp_chunk *chunk = arg; |
3017 | int error; | |
3018 | ||
3019 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3020 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3021 | SCTP_NULL()); | |
24cb81a6 | 3022 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3023 | } |
1da177e4 | 3024 | |
9f8d3147 | 3025 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_data_chunk))) |
24cb81a6 | 3026 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3027 | commands); |
3028 | ||
cb3f837b | 3029 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3030 | switch (error) { |
3031 | case SCTP_IERROR_NO_ERROR: | |
3032 | break; | |
3033 | case SCTP_IERROR_HIGH_TSN: | |
3034 | case SCTP_IERROR_BAD_STREAM: | |
24cb81a6 | 3035 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3036 | goto discard_noforce; |
3037 | case SCTP_IERROR_DUP_TSN: | |
3038 | case SCTP_IERROR_IGNORE_TSN: | |
24cb81a6 | 3039 | SCTP_INC_STATS(net, SCTP_MIB_IN_DATA_CHUNK_DISCARDS); |
1da177e4 LT |
3040 | goto discard_force; |
3041 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3042 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3043 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3044 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a XL |
3045 | (u8 *)chunk->subh.data_hdr, |
3046 | sizeof(struct sctp_datahdr)); | |
1da177e4 LT |
3047 | default: |
3048 | BUG(); | |
3049 | } | |
3050 | ||
6dc7694f WY |
3051 | if (chunk->chunk_hdr->flags & SCTP_DATA_SACK_IMM) |
3052 | force = SCTP_FORCE(); | |
3053 | ||
9f70f46b | 3054 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
3055 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
3056 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
3057 | } | |
3058 | ||
3059 | /* If this is the last chunk in a packet, we need to count it | |
3060 | * toward sack generation. Note that we need to SACK every | |
3061 | * OTHER packet containing data chunks, EVEN IF WE DISCARD | |
3062 | * THEM. We elect to NOT generate SACK's if the chunk fails | |
3063 | * the verification tag test. | |
3064 | * | |
3065 | * RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3066 | * | |
3067 | * The SCTP endpoint MUST always acknowledge the reception of | |
3068 | * each valid DATA chunk. | |
3069 | * | |
3070 | * The guidelines on delayed acknowledgement algorithm | |
3071 | * specified in Section 4.2 of [RFC2581] SHOULD be followed. | |
3072 | * Specifically, an acknowledgement SHOULD be generated for at | |
3073 | * least every second packet (not every second DATA chunk) | |
3074 | * received, and SHOULD be generated within 200 ms of the | |
3075 | * arrival of any unacknowledged DATA chunk. In some | |
3076 | * situations it may be beneficial for an SCTP transmitter to | |
3077 | * be more conservative than the algorithms detailed in this | |
3078 | * document allow. However, an SCTP transmitter MUST NOT be | |
3079 | * more aggressive than the following algorithms allow. | |
3080 | */ | |
52ccb8e9 | 3081 | if (chunk->end_of_packet) |
6dc7694f | 3082 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3083 | |
1da177e4 LT |
3084 | return SCTP_DISPOSITION_CONSUME; |
3085 | ||
3086 | discard_force: | |
3087 | /* RFC 2960 6.2 Acknowledgement on Reception of DATA Chunks | |
3088 | * | |
3089 | * When a packet arrives with duplicate DATA chunk(s) and with | |
3090 | * no new DATA chunk(s), the endpoint MUST immediately send a | |
3091 | * SACK with no delay. If a packet arrives with duplicate | |
3092 | * DATA chunk(s) bundled with new DATA chunks, the endpoint | |
3093 | * MAY immediately send a SACK. Normally receipt of duplicate | |
3094 | * DATA chunks will occur when the original SACK chunk was lost | |
3095 | * and the peer's RTO has expired. The duplicate TSN number(s) | |
3096 | * SHOULD be reported in the SACK as duplicate. | |
3097 | */ | |
3098 | /* In our case, we split the MAY SACK advice up whether or not | |
3099 | * the last chunk is a duplicate.' | |
3100 | */ | |
3101 | if (chunk->end_of_packet) | |
3102 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3103 | return SCTP_DISPOSITION_DISCARD; | |
3104 | ||
3105 | discard_noforce: | |
52ccb8e9 | 3106 | if (chunk->end_of_packet) |
6dc7694f | 3107 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, force); |
1da177e4 | 3108 | |
1da177e4 | 3109 | return SCTP_DISPOSITION_DISCARD; |
1da177e4 LT |
3110 | } |
3111 | ||
3112 | /* | |
3113 | * sctp_sf_eat_data_fast_4_4 | |
3114 | * | |
3115 | * Section: 4 (4) | |
3116 | * (4) In SHUTDOWN-SENT state the endpoint MUST acknowledge any received | |
3117 | * DATA chunks without delay. | |
3118 | * | |
3119 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3120 | * Inputs | |
3121 | * (endpoint, asoc, chunk) | |
3122 | * | |
3123 | * Outputs | |
3124 | * (asoc, reply_msg, msg_up, timers, counters) | |
3125 | * | |
3126 | * The return value is the disposition of the chunk. | |
3127 | */ | |
172a1599 XL |
3128 | enum sctp_disposition sctp_sf_eat_data_fast_4_4( |
3129 | struct net *net, | |
3130 | const struct sctp_endpoint *ep, | |
3131 | const struct sctp_association *asoc, | |
3132 | const union sctp_subtype type, | |
3133 | void *arg, | |
3134 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3135 | { |
3136 | struct sctp_chunk *chunk = arg; | |
3137 | int error; | |
3138 | ||
3139 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3140 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3141 | SCTP_NULL()); | |
24cb81a6 | 3142 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3143 | } |
3144 | ||
9f8d3147 | 3145 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_data_chunk))) |
24cb81a6 | 3146 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3147 | commands); |
3148 | ||
cb3f837b | 3149 | error = sctp_eat_data(asoc, chunk, commands); |
1da177e4 LT |
3150 | switch (error) { |
3151 | case SCTP_IERROR_NO_ERROR: | |
3152 | case SCTP_IERROR_HIGH_TSN: | |
3153 | case SCTP_IERROR_DUP_TSN: | |
3154 | case SCTP_IERROR_IGNORE_TSN: | |
3155 | case SCTP_IERROR_BAD_STREAM: | |
3156 | break; | |
3157 | case SCTP_IERROR_NO_DATA: | |
649621e3 | 3158 | return SCTP_DISPOSITION_ABORT; |
f1751c57 | 3159 | case SCTP_IERROR_PROTO_VIOLATION: |
24cb81a6 | 3160 | return sctp_sf_abort_violation(net, ep, asoc, chunk, commands, |
3583df1a XL |
3161 | (u8 *)chunk->subh.data_hdr, |
3162 | sizeof(struct sctp_datahdr)); | |
1da177e4 LT |
3163 | default: |
3164 | BUG(); | |
3165 | } | |
3166 | ||
3167 | /* Go a head and force a SACK, since we are shutting down. */ | |
3168 | ||
3169 | /* Implementor's Guide. | |
3170 | * | |
3171 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
3172 | * respond to each received packet containing one or more DATA chunk(s) | |
3173 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
3174 | */ | |
3175 | if (chunk->end_of_packet) { | |
3176 | /* We must delay the chunk creation since the cumulative | |
3177 | * TSN has not been updated yet. | |
3178 | */ | |
3179 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
3180 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
3181 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
3182 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3183 | } | |
3184 | ||
1da177e4 LT |
3185 | return SCTP_DISPOSITION_CONSUME; |
3186 | } | |
3187 | ||
3188 | /* | |
3189 | * Section: 6.2 Processing a Received SACK | |
3190 | * D) Any time a SACK arrives, the endpoint performs the following: | |
3191 | * | |
3192 | * i) If Cumulative TSN Ack is less than the Cumulative TSN Ack Point, | |
3193 | * then drop the SACK. Since Cumulative TSN Ack is monotonically | |
3194 | * increasing, a SACK whose Cumulative TSN Ack is less than the | |
3195 | * Cumulative TSN Ack Point indicates an out-of-order SACK. | |
3196 | * | |
3197 | * ii) Set rwnd equal to the newly received a_rwnd minus the number | |
3198 | * of bytes still outstanding after processing the Cumulative TSN Ack | |
3199 | * and the Gap Ack Blocks. | |
3200 | * | |
3201 | * iii) If the SACK is missing a TSN that was previously | |
3202 | * acknowledged via a Gap Ack Block (e.g., the data receiver | |
3203 | * reneged on the data), then mark the corresponding DATA chunk | |
3204 | * as available for retransmit: Mark it as missing for fast | |
3205 | * retransmit as described in Section 7.2.4 and if no retransmit | |
3206 | * timer is running for the destination address to which the DATA | |
3207 | * chunk was originally transmitted, then T3-rtx is started for | |
3208 | * that destination address. | |
3209 | * | |
3210 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3211 | * | |
3212 | * Inputs | |
3213 | * (endpoint, asoc, chunk) | |
3214 | * | |
3215 | * Outputs | |
3216 | * (asoc, reply_msg, msg_up, timers, counters) | |
3217 | * | |
3218 | * The return value is the disposition of the chunk. | |
3219 | */ | |
172a1599 XL |
3220 | enum sctp_disposition sctp_sf_eat_sack_6_2(struct net *net, |
3221 | const struct sctp_endpoint *ep, | |
3222 | const struct sctp_association *asoc, | |
3223 | const union sctp_subtype type, | |
3224 | void *arg, | |
3225 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3226 | { |
3227 | struct sctp_chunk *chunk = arg; | |
78731085 | 3228 | struct sctp_sackhdr *sackh; |
1da177e4 LT |
3229 | __u32 ctsn; |
3230 | ||
3231 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3232 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3233 | |
3234 | /* Make sure that the SACK chunk has a valid length. */ | |
d4d6c614 | 3235 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_sack_chunk))) |
24cb81a6 | 3236 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3237 | commands); |
3238 | ||
3239 | /* Pull the SACK chunk from the data buffer */ | |
3240 | sackh = sctp_sm_pull_sack(chunk); | |
3241 | /* Was this a bogus SACK? */ | |
3242 | if (!sackh) | |
24cb81a6 | 3243 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3244 | chunk->subh.sack_hdr = sackh; |
3245 | ctsn = ntohl(sackh->cum_tsn_ack); | |
3246 | ||
3247 | /* i) If Cumulative TSN Ack is less than the Cumulative TSN | |
3248 | * Ack Point, then drop the SACK. Since Cumulative TSN | |
3249 | * Ack is monotonically increasing, a SACK whose | |
3250 | * Cumulative TSN Ack is less than the Cumulative TSN Ack | |
3251 | * Point indicates an out-of-order SACK. | |
3252 | */ | |
3253 | if (TSN_lt(ctsn, asoc->ctsn_ack_point)) { | |
bb33381d DB |
3254 | pr_debug("%s: ctsn:%x, ctsn_ack_point:%x\n", __func__, ctsn, |
3255 | asoc->ctsn_ack_point); | |
3256 | ||
1da177e4 LT |
3257 | return SCTP_DISPOSITION_DISCARD; |
3258 | } | |
3259 | ||
aecedeab WY |
3260 | /* If Cumulative TSN Ack beyond the max tsn currently |
3261 | * send, terminating the association and respond to the | |
3262 | * sender with an ABORT. | |
3263 | */ | |
3264 | if (!TSN_lt(ctsn, asoc->next_tsn)) | |
24cb81a6 | 3265 | return sctp_sf_violation_ctsn(net, ep, asoc, type, arg, commands); |
aecedeab | 3266 | |
1da177e4 | 3267 | /* Return this SACK for further processing. */ |
edfee033 | 3268 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, SCTP_CHUNK(chunk)); |
1da177e4 LT |
3269 | |
3270 | /* Note: We do the rest of the work on the PROCESS_SACK | |
3271 | * sideeffect. | |
3272 | */ | |
3273 | return SCTP_DISPOSITION_CONSUME; | |
3274 | } | |
3275 | ||
3276 | /* | |
3277 | * Generate an ABORT in response to a packet. | |
3278 | * | |
047a2428 | 3279 | * Section: 8.4 Handle "Out of the blue" Packets, sctpimpguide 2.41 |
1da177e4 | 3280 | * |
047a2428 JF |
3281 | * 8) The receiver should respond to the sender of the OOTB packet with |
3282 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3283 | * MUST fill in the Verification Tag field of the outbound packet | |
3284 | * with the value found in the Verification Tag field of the OOTB | |
3285 | * packet and set the T-bit in the Chunk Flags to indicate that the | |
3286 | * Verification Tag is reflected. After sending this ABORT, the | |
3287 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3288 | * no further action. | |
1da177e4 LT |
3289 | * |
3290 | * Verification Tag: | |
3291 | * | |
3292 | * The return value is the disposition of the chunk. | |
3293 | */ | |
172a1599 XL |
3294 | static enum sctp_disposition sctp_sf_tabort_8_4_8( |
3295 | struct net *net, | |
24cb81a6 | 3296 | const struct sctp_endpoint *ep, |
1da177e4 | 3297 | const struct sctp_association *asoc, |
bfc6f827 | 3298 | const union sctp_subtype type, |
1da177e4 | 3299 | void *arg, |
a85bbeb2 | 3300 | struct sctp_cmd_seq *commands) |
1da177e4 LT |
3301 | { |
3302 | struct sctp_packet *packet = NULL; | |
3303 | struct sctp_chunk *chunk = arg; | |
3304 | struct sctp_chunk *abort; | |
3305 | ||
2ce95503 | 3306 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
eab59075 MRL |
3307 | if (!packet) |
3308 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3309 | |
eab59075 MRL |
3310 | /* Make an ABORT. The T bit will be set if the asoc |
3311 | * is NULL. | |
3312 | */ | |
3313 | abort = sctp_make_abort(asoc, chunk, 0); | |
3314 | if (!abort) { | |
3315 | sctp_ootb_pkt_free(packet); | |
3316 | return SCTP_DISPOSITION_NOMEM; | |
3317 | } | |
047a2428 | 3318 | |
eab59075 MRL |
3319 | /* Reflect vtag if T-Bit is set */ |
3320 | if (sctp_test_T_bit(abort)) | |
3321 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3322 | |
eab59075 MRL |
3323 | /* Set the skb to the belonging sock for accounting. */ |
3324 | abort->skb->sk = ep->base.sk; | |
1da177e4 | 3325 | |
eab59075 | 3326 | sctp_packet_append_chunk(packet, abort); |
1da177e4 | 3327 | |
eab59075 MRL |
3328 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3329 | SCTP_PACKET(packet)); | |
1da177e4 | 3330 | |
eab59075 | 3331 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3332 | |
eab59075 MRL |
3333 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
3334 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
3335 | } |
3336 | ||
3337 | /* | |
3338 | * Received an ERROR chunk from peer. Generate SCTP_REMOTE_ERROR | |
3339 | * event as ULP notification for each cause included in the chunk. | |
3340 | * | |
3341 | * API 5.3.1.3 - SCTP_REMOTE_ERROR | |
3342 | * | |
3343 | * The return value is the disposition of the chunk. | |
3344 | */ | |
172a1599 XL |
3345 | enum sctp_disposition sctp_sf_operr_notify(struct net *net, |
3346 | const struct sctp_endpoint *ep, | |
3347 | const struct sctp_association *asoc, | |
3348 | const union sctp_subtype type, | |
3349 | void *arg, | |
3350 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3351 | { |
3352 | struct sctp_chunk *chunk = arg; | |
d8238d9d | 3353 | struct sctp_errhdr *err; |
1da177e4 LT |
3354 | |
3355 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3356 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3357 | |
3358 | /* Make sure that the ERROR chunk has a valid length. */ | |
87caeba7 | 3359 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_operr_chunk))) |
24cb81a6 | 3360 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3361 | commands); |
8a00be1c SW |
3362 | sctp_walk_errors(err, chunk->chunk_hdr); |
3363 | if ((void *)err != (void *)chunk->chunk_end) | |
24cb81a6 | 3364 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
8a00be1c | 3365 | (void *)err, commands); |
1da177e4 | 3366 | |
3df26787 WY |
3367 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_OPERR, |
3368 | SCTP_CHUNK(chunk)); | |
1da177e4 | 3369 | |
1da177e4 | 3370 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
3371 | } |
3372 | ||
3373 | /* | |
3374 | * Process an inbound SHUTDOWN ACK. | |
3375 | * | |
3376 | * From Section 9.2: | |
3377 | * Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3378 | * stop the T2-shutdown timer, send a SHUTDOWN COMPLETE chunk to its | |
3379 | * peer, and remove all record of the association. | |
3380 | * | |
3381 | * The return value is the disposition. | |
3382 | */ | |
172a1599 XL |
3383 | enum sctp_disposition sctp_sf_do_9_2_final(struct net *net, |
3384 | const struct sctp_endpoint *ep, | |
3385 | const struct sctp_association *asoc, | |
3386 | const union sctp_subtype type, | |
3387 | void *arg, | |
3388 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3389 | { |
3390 | struct sctp_chunk *chunk = arg; | |
3391 | struct sctp_chunk *reply; | |
3392 | struct sctp_ulpevent *ev; | |
3393 | ||
3394 | if (!sctp_vtag_verify(chunk, asoc)) | |
24cb81a6 | 3395 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3396 | |
3397 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3398 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3399 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 | 3400 | commands); |
1da177e4 LT |
3401 | /* 10.2 H) SHUTDOWN COMPLETE notification |
3402 | * | |
3403 | * When SCTP completes the shutdown procedures (section 9.2) this | |
3404 | * notification is passed to the upper layer. | |
3405 | */ | |
3406 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_SHUTDOWN_COMP, | |
a5a35e76 | 3407 | 0, 0, 0, NULL, GFP_ATOMIC); |
1da177e4 LT |
3408 | if (!ev) |
3409 | goto nomem; | |
3410 | ||
df7deeb5 VY |
3411 | /* ...send a SHUTDOWN COMPLETE chunk to its peer, */ |
3412 | reply = sctp_make_shutdown_complete(asoc, chunk); | |
3413 | if (!reply) | |
3414 | goto nomem_chunk; | |
3415 | ||
3416 | /* Do all the commands now (after allocation), so that we | |
3417 | * have consistent state if memory allocation failes | |
3418 | */ | |
1da177e4 LT |
3419 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev)); |
3420 | ||
3421 | /* Upon the receipt of the SHUTDOWN ACK, the SHUTDOWN sender shall | |
3422 | * stop the T2-shutdown timer, | |
3423 | */ | |
3424 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3425 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
3426 | ||
3427 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3428 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
3429 | ||
1da177e4 LT |
3430 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
3431 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
b01a2407 EB |
3432 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
3433 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3434 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); |
3435 | ||
3436 | /* ...and remove all record of the association. */ | |
3437 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
3438 | return SCTP_DISPOSITION_DELETE_TCB; | |
3439 | ||
df7deeb5 VY |
3440 | nomem_chunk: |
3441 | sctp_ulpevent_free(ev); | |
1da177e4 LT |
3442 | nomem: |
3443 | return SCTP_DISPOSITION_NOMEM; | |
3444 | } | |
3445 | ||
3446 | /* | |
047a2428 JF |
3447 | * RFC 2960, 8.4 - Handle "Out of the blue" Packets, sctpimpguide 2.41. |
3448 | * | |
1da177e4 LT |
3449 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
3450 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. | |
3451 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3452 | * packet must fill in the Verification Tag field of the outbound | |
3453 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
047a2428 JF |
3454 | * set the T-bit in the Chunk Flags to indicate that the Verification |
3455 | * Tag is reflected. | |
1da177e4 LT |
3456 | * |
3457 | * 8) The receiver should respond to the sender of the OOTB packet with | |
3458 | * an ABORT. When sending the ABORT, the receiver of the OOTB packet | |
3459 | * MUST fill in the Verification Tag field of the outbound packet | |
3460 | * with the value found in the Verification Tag field of the OOTB | |
047a2428 JF |
3461 | * packet and set the T-bit in the Chunk Flags to indicate that the |
3462 | * Verification Tag is reflected. After sending this ABORT, the | |
3463 | * receiver of the OOTB packet shall discard the OOTB packet and take | |
3464 | * no further action. | |
1da177e4 | 3465 | */ |
172a1599 XL |
3466 | enum sctp_disposition sctp_sf_ootb(struct net *net, |
3467 | const struct sctp_endpoint *ep, | |
3468 | const struct sctp_association *asoc, | |
3469 | const union sctp_subtype type, | |
3470 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3471 | { |
3472 | struct sctp_chunk *chunk = arg; | |
3473 | struct sk_buff *skb = chunk->skb; | |
922dbc5b | 3474 | struct sctp_chunkhdr *ch; |
d8238d9d | 3475 | struct sctp_errhdr *err; |
85c5ed4e | 3476 | int ootb_cookie_ack = 0; |
172a1599 XL |
3477 | int ootb_shut_ack = 0; |
3478 | __u8 *ch_end; | |
1da177e4 | 3479 | |
b01a2407 | 3480 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
1da177e4 | 3481 | |
922dbc5b | 3482 | ch = (struct sctp_chunkhdr *)chunk->chunk_hdr; |
1da177e4 | 3483 | do { |
ece25dfa | 3484 | /* Report violation if the chunk is less then minimal */ |
922dbc5b | 3485 | if (ntohs(ch->length) < sizeof(*ch)) |
24cb81a6 | 3486 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa | 3487 | commands); |
1da177e4 | 3488 | |
bf911e98 MRL |
3489 | /* Report violation if chunk len overflows */ |
3490 | ch_end = ((__u8 *)ch) + SCTP_PAD4(ntohs(ch->length)); | |
3491 | if (ch_end > skb_tail_pointer(skb)) | |
3492 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3493 | commands); | |
3494 | ||
ece25dfa VY |
3495 | /* Now that we know we at least have a chunk header, |
3496 | * do things that are type appropriate. | |
3497 | */ | |
1da177e4 LT |
3498 | if (SCTP_CID_SHUTDOWN_ACK == ch->type) |
3499 | ootb_shut_ack = 1; | |
3500 | ||
3501 | /* RFC 2960, Section 3.3.7 | |
3502 | * Moreover, under any circumstances, an endpoint that | |
3503 | * receives an ABORT MUST NOT respond to that ABORT by | |
3504 | * sending an ABORT of its own. | |
3505 | */ | |
3506 | if (SCTP_CID_ABORT == ch->type) | |
24cb81a6 | 3507 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
d808ad9a | 3508 | |
85c5ed4e SW |
3509 | /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR |
3510 | * or a COOKIE ACK the SCTP Packet should be silently | |
3511 | * discarded. | |
3512 | */ | |
3513 | ||
3514 | if (SCTP_CID_COOKIE_ACK == ch->type) | |
3515 | ootb_cookie_ack = 1; | |
3516 | ||
3517 | if (SCTP_CID_ERROR == ch->type) { | |
3518 | sctp_walk_errors(err, ch) { | |
3519 | if (SCTP_ERROR_STALE_COOKIE == err->cause) { | |
3520 | ootb_cookie_ack = 1; | |
3521 | break; | |
3522 | } | |
3523 | } | |
3524 | } | |
3525 | ||
922dbc5b | 3526 | ch = (struct sctp_chunkhdr *)ch_end; |
27a884dc | 3527 | } while (ch_end < skb_tail_pointer(skb)); |
1da177e4 LT |
3528 | |
3529 | if (ootb_shut_ack) | |
24cb81a6 | 3530 | return sctp_sf_shut_8_4_5(net, ep, asoc, type, arg, commands); |
85c5ed4e | 3531 | else if (ootb_cookie_ack) |
24cb81a6 | 3532 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3533 | else |
24cb81a6 | 3534 | return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3535 | } |
3536 | ||
3537 | /* | |
3538 | * Handle an "Out of the blue" SHUTDOWN ACK. | |
3539 | * | |
047a2428 JF |
3540 | * Section: 8.4 5, sctpimpguide 2.41. |
3541 | * | |
1da177e4 | 3542 | * 5) If the packet contains a SHUTDOWN ACK chunk, the receiver should |
047a2428 JF |
3543 | * respond to the sender of the OOTB packet with a SHUTDOWN COMPLETE. |
3544 | * When sending the SHUTDOWN COMPLETE, the receiver of the OOTB | |
3545 | * packet must fill in the Verification Tag field of the outbound | |
3546 | * packet with the Verification Tag received in the SHUTDOWN ACK and | |
3547 | * set the T-bit in the Chunk Flags to indicate that the Verification | |
3548 | * Tag is reflected. | |
1da177e4 LT |
3549 | * |
3550 | * Inputs | |
3551 | * (endpoint, asoc, type, arg, commands) | |
3552 | * | |
3553 | * Outputs | |
172a1599 | 3554 | * (enum sctp_disposition) |
1da177e4 LT |
3555 | * |
3556 | * The return value is the disposition of the chunk. | |
3557 | */ | |
172a1599 XL |
3558 | static enum sctp_disposition sctp_sf_shut_8_4_5( |
3559 | struct net *net, | |
3560 | const struct sctp_endpoint *ep, | |
3561 | const struct sctp_association *asoc, | |
3562 | const union sctp_subtype type, | |
3563 | void *arg, | |
3564 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
3565 | { |
3566 | struct sctp_packet *packet = NULL; | |
3567 | struct sctp_chunk *chunk = arg; | |
3568 | struct sctp_chunk *shut; | |
3569 | ||
2ce95503 | 3570 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1ff01561 MRL |
3571 | if (!packet) |
3572 | return SCTP_DISPOSITION_NOMEM; | |
1da177e4 | 3573 | |
1ff01561 MRL |
3574 | /* Make an SHUTDOWN_COMPLETE. |
3575 | * The T bit will be set if the asoc is NULL. | |
3576 | */ | |
3577 | shut = sctp_make_shutdown_complete(asoc, chunk); | |
3578 | if (!shut) { | |
3579 | sctp_ootb_pkt_free(packet); | |
3580 | return SCTP_DISPOSITION_NOMEM; | |
3581 | } | |
047a2428 | 3582 | |
1ff01561 MRL |
3583 | /* Reflect vtag if T-Bit is set */ |
3584 | if (sctp_test_T_bit(shut)) | |
3585 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
1da177e4 | 3586 | |
1ff01561 MRL |
3587 | /* Set the skb to the belonging sock for accounting. */ |
3588 | shut->skb->sk = ep->base.sk; | |
1da177e4 | 3589 | |
1ff01561 | 3590 | sctp_packet_append_chunk(packet, shut); |
1da177e4 | 3591 | |
1ff01561 MRL |
3592 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, |
3593 | SCTP_PACKET(packet)); | |
1da177e4 | 3594 | |
1ff01561 | 3595 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 3596 | |
1ff01561 MRL |
3597 | /* If the chunk length is invalid, we don't want to process |
3598 | * the reset of the packet. | |
3599 | */ | |
922dbc5b | 3600 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3601 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 3602 | |
1ff01561 MRL |
3603 | /* We need to discard the rest of the packet to prevent |
3604 | * potential bomming attacks from additional bundled chunks. | |
3605 | * This is documented in SCTP Threats ID. | |
3606 | */ | |
3607 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
1da177e4 LT |
3608 | } |
3609 | ||
3610 | /* | |
3611 | * Handle SHUTDOWN ACK in COOKIE_ECHOED or COOKIE_WAIT state. | |
3612 | * | |
3613 | * Verification Tag: 8.5.1 E) Rules for packet carrying a SHUTDOWN ACK | |
3614 | * If the receiver is in COOKIE-ECHOED or COOKIE-WAIT state the | |
3615 | * procedures in section 8.4 SHOULD be followed, in other words it | |
3616 | * should be treated as an Out Of The Blue packet. | |
3617 | * [This means that we do NOT check the Verification Tag on these | |
3618 | * chunks. --piggy ] | |
3619 | * | |
3620 | */ | |
172a1599 XL |
3621 | enum sctp_disposition sctp_sf_do_8_5_1_E_sa(struct net *net, |
3622 | const struct sctp_endpoint *ep, | |
3623 | const struct sctp_association *asoc, | |
3624 | const union sctp_subtype type, | |
3625 | void *arg, | |
3626 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3627 | { |
ece25dfa VY |
3628 | struct sctp_chunk *chunk = arg; |
3629 | ||
3630 | /* Make sure that the SHUTDOWN_ACK chunk has a valid length. */ | |
922dbc5b | 3631 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 3632 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
3633 | commands); |
3634 | ||
1da177e4 LT |
3635 | /* Although we do have an association in this case, it corresponds |
3636 | * to a restarted association. So the packet is treated as an OOTB | |
3637 | * packet and the state function that handles OOTB SHUTDOWN_ACK is | |
3638 | * called with a NULL association. | |
3639 | */ | |
24cb81a6 | 3640 | SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); |
8190f89d | 3641 | |
24cb81a6 | 3642 | return sctp_sf_shut_8_4_5(net, ep, NULL, type, arg, commands); |
1da177e4 LT |
3643 | } |
3644 | ||
3645 | /* ADDIP Section 4.2 Upon reception of an ASCONF Chunk. */ | |
172a1599 XL |
3646 | enum sctp_disposition sctp_sf_do_asconf(struct net *net, |
3647 | const struct sctp_endpoint *ep, | |
3648 | const struct sctp_association *asoc, | |
3649 | const union sctp_subtype type, | |
3650 | void *arg, | |
3651 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3652 | { |
172a1599 XL |
3653 | struct sctp_paramhdr *err_param = NULL; |
3654 | struct sctp_chunk *asconf_ack = NULL; | |
3655 | struct sctp_chunk *chunk = arg; | |
3656 | struct sctp_addiphdr *hdr; | |
3657 | __u32 serial; | |
1da177e4 LT |
3658 | |
3659 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3660 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3661 | SCTP_NULL()); | |
24cb81a6 | 3662 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3663 | } |
3664 | ||
6afd2e83 VY |
3665 | /* ADD-IP: Section 4.1.1 |
3666 | * This chunk MUST be sent in an authenticated way by using | |
3667 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3668 | * is received unauthenticated it MUST be silently discarded as | |
3669 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3670 | */ | |
e1fc3b14 | 3671 | if (!net->sctp.addip_noauth && !chunk->auth) |
68d75469 XL |
3672 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3673 | commands); | |
6afd2e83 | 3674 | |
1da177e4 | 3675 | /* Make sure that the ASCONF ADDIP chunk has a valid length. */ |
68d75469 | 3676 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_addip_chunk))) |
24cb81a6 | 3677 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3678 | commands); |
3679 | ||
65205cc4 | 3680 | hdr = (struct sctp_addiphdr *)chunk->skb->data; |
1da177e4 LT |
3681 | serial = ntohl(hdr->serial); |
3682 | ||
6f4c618d | 3683 | /* Verify the ASCONF chunk before processing it. */ |
9de7922b | 3684 | if (!sctp_verify_asconf(asoc, chunk, true, &err_param)) |
24cb81a6 | 3685 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3686 | (void *)err_param, commands); |
6f4c618d | 3687 | |
a08de64d | 3688 | /* ADDIP 5.2 E1) Compare the value of the serial number to the value |
1da177e4 | 3689 | * the endpoint stored in a new association variable |
d808ad9a | 3690 | * 'Peer-Serial-Number'. |
1da177e4 LT |
3691 | */ |
3692 | if (serial == asoc->peer.addip_serial + 1) { | |
a08de64d VY |
3693 | /* If this is the first instance of ASCONF in the packet, |
3694 | * we can clean our old ASCONF-ACKs. | |
3695 | */ | |
3696 | if (!chunk->has_asconf) | |
3697 | sctp_assoc_clean_asconf_ack_cache(asoc); | |
3698 | ||
3699 | /* ADDIP 5.2 E4) When the Sequence Number matches the next one | |
3700 | * expected, process the ASCONF as described below and after | |
3701 | * processing the ASCONF Chunk, append an ASCONF-ACK Chunk to | |
3702 | * the response packet and cache a copy of it (in the event it | |
3703 | * later needs to be retransmitted). | |
3704 | * | |
3705 | * Essentially, do V1-V5. | |
1da177e4 LT |
3706 | */ |
3707 | asconf_ack = sctp_process_asconf((struct sctp_association *) | |
3708 | asoc, chunk); | |
3709 | if (!asconf_ack) | |
3710 | return SCTP_DISPOSITION_NOMEM; | |
a08de64d VY |
3711 | } else if (serial < asoc->peer.addip_serial + 1) { |
3712 | /* ADDIP 5.2 E2) | |
3713 | * If the value found in the Sequence Number is less than the | |
3714 | * ('Peer- Sequence-Number' + 1), simply skip to the next | |
3715 | * ASCONF, and include in the outbound response packet | |
3716 | * any previously cached ASCONF-ACK response that was | |
3717 | * sent and saved that matches the Sequence Number of the | |
3718 | * ASCONF. Note: It is possible that no cached ASCONF-ACK | |
3719 | * Chunk exists. This will occur when an older ASCONF | |
3720 | * arrives out of order. In such a case, the receiver | |
3721 | * should skip the ASCONF Chunk and not include ASCONF-ACK | |
3722 | * Chunk for that chunk. | |
1da177e4 | 3723 | */ |
a08de64d VY |
3724 | asconf_ack = sctp_assoc_lookup_asconf_ack(asoc, hdr->serial); |
3725 | if (!asconf_ack) | |
1da177e4 | 3726 | return SCTP_DISPOSITION_DISCARD; |
31b02e15 VY |
3727 | |
3728 | /* Reset the transport so that we select the correct one | |
3729 | * this time around. This is to make sure that we don't | |
3730 | * accidentally use a stale transport that's been removed. | |
3731 | */ | |
3732 | asconf_ack->transport = NULL; | |
1da177e4 | 3733 | } else { |
a08de64d | 3734 | /* ADDIP 5.2 E5) Otherwise, the ASCONF Chunk is discarded since |
1da177e4 | 3735 | * it must be either a stale packet or from an attacker. |
d808ad9a | 3736 | */ |
1da177e4 LT |
3737 | return SCTP_DISPOSITION_DISCARD; |
3738 | } | |
3739 | ||
a08de64d VY |
3740 | /* ADDIP 5.2 E6) The destination address of the SCTP packet |
3741 | * containing the ASCONF-ACK Chunks MUST be the source address of | |
3742 | * the SCTP packet that held the ASCONF Chunks. | |
3743 | * | |
3744 | * To do this properly, we'll set the destination address of the chunk | |
3745 | * and at the transmit time, will try look up the transport to use. | |
3746 | * Since ASCONFs may be bundled, the correct transport may not be | |
94e2bd68 | 3747 | * created until we process the entire packet, thus this workaround. |
1da177e4 | 3748 | */ |
a08de64d | 3749 | asconf_ack->dest = chunk->source; |
1da177e4 | 3750 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack)); |
6af29ccc | 3751 | if (asoc->new_transport) { |
f7010e61 | 3752 | sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands); |
6af29ccc MH |
3753 | ((struct sctp_association *)asoc)->new_transport = NULL; |
3754 | } | |
d808ad9a | 3755 | |
1da177e4 LT |
3756 | return SCTP_DISPOSITION_CONSUME; |
3757 | } | |
3758 | ||
3759 | /* | |
3760 | * ADDIP Section 4.3 General rules for address manipulation | |
3761 | * When building TLV parameters for the ASCONF Chunk that will add or | |
3762 | * delete IP addresses the D0 to D13 rules should be applied: | |
3763 | */ | |
172a1599 XL |
3764 | enum sctp_disposition sctp_sf_do_asconf_ack(struct net *net, |
3765 | const struct sctp_endpoint *ep, | |
3766 | const struct sctp_association *asoc, | |
3767 | const union sctp_subtype type, | |
3768 | void *arg, | |
3769 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3770 | { |
172a1599 XL |
3771 | struct sctp_chunk *last_asconf = asoc->addip_last_asconf; |
3772 | struct sctp_paramhdr *err_param = NULL; | |
3773 | struct sctp_chunk *asconf_ack = arg; | |
3774 | struct sctp_addiphdr *addip_hdr; | |
3775 | __u32 sent_serial, rcvd_serial; | |
3776 | struct sctp_chunk *abort; | |
1da177e4 LT |
3777 | |
3778 | if (!sctp_vtag_verify(asconf_ack, asoc)) { | |
3779 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3780 | SCTP_NULL()); | |
24cb81a6 | 3781 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3782 | } |
3783 | ||
6afd2e83 VY |
3784 | /* ADD-IP, Section 4.1.2: |
3785 | * This chunk MUST be sent in an authenticated way by using | |
3786 | * the mechanism defined in [I-D.ietf-tsvwg-sctp-auth]. If this chunk | |
3787 | * is received unauthenticated it MUST be silently discarded as | |
3788 | * described in [I-D.ietf-tsvwg-sctp-auth]. | |
3789 | */ | |
e1fc3b14 | 3790 | if (!net->sctp.addip_noauth && !asconf_ack->auth) |
68d75469 XL |
3791 | return sctp_sf_discard_chunk(net, ep, asoc, type, arg, |
3792 | commands); | |
6afd2e83 | 3793 | |
1da177e4 | 3794 | /* Make sure that the ADDIP chunk has a valid length. */ |
68d75469 XL |
3795 | if (!sctp_chunk_length_valid(asconf_ack, |
3796 | sizeof(struct sctp_addip_chunk))) | |
24cb81a6 | 3797 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3798 | commands); |
3799 | ||
65205cc4 | 3800 | addip_hdr = (struct sctp_addiphdr *)asconf_ack->skb->data; |
1da177e4 LT |
3801 | rcvd_serial = ntohl(addip_hdr->serial); |
3802 | ||
6f4c618d | 3803 | /* Verify the ASCONF-ACK chunk before processing it. */ |
9de7922b | 3804 | if (!sctp_verify_asconf(asoc, asconf_ack, false, &err_param)) |
24cb81a6 | 3805 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, |
ba016670 | 3806 | (void *)err_param, commands); |
6f4c618d | 3807 | |
1da177e4 | 3808 | if (last_asconf) { |
65205cc4 | 3809 | addip_hdr = (struct sctp_addiphdr *)last_asconf->subh.addip_hdr; |
1da177e4 LT |
3810 | sent_serial = ntohl(addip_hdr->serial); |
3811 | } else { | |
3812 | sent_serial = asoc->addip_serial - 1; | |
3813 | } | |
3814 | ||
3815 | /* D0) If an endpoint receives an ASCONF-ACK that is greater than or | |
3816 | * equal to the next serial number to be used but no ASCONF chunk is | |
3817 | * outstanding the endpoint MUST ABORT the association. Note that a | |
3818 | * sequence number is greater than if it is no more than 2^^31-1 | |
3819 | * larger than the current sequence number (using serial arithmetic). | |
3820 | */ | |
3821 | if (ADDIP_SERIAL_gte(rcvd_serial, sent_serial + 1) && | |
3822 | !(asoc->addip_last_asconf)) { | |
3823 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3824 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3825 | if (abort) { |
00f1c2df | 3826 | sctp_init_cause(abort, SCTP_ERROR_ASCONF_ACK, 0); |
1da177e4 LT |
3827 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3828 | SCTP_CHUNK(abort)); | |
3829 | } | |
3830 | /* We are going to ABORT, so we might as well stop | |
3831 | * processing the rest of the chunks in the packet. | |
3832 | */ | |
3833 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3834 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
cb3f837b | 3835 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3836 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3837 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3838 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3839 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3840 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3841 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3842 | return SCTP_DISPOSITION_ABORT; |
3843 | } | |
3844 | ||
3845 | if ((rcvd_serial == sent_serial) && asoc->addip_last_asconf) { | |
3846 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
3847 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
3848 | ||
3849 | if (!sctp_process_asconf_ack((struct sctp_association *)asoc, | |
c0786693 VY |
3850 | asconf_ack)) { |
3851 | /* Successfully processed ASCONF_ACK. We can | |
3852 | * release the next asconf if we have one. | |
3853 | */ | |
3854 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_NEXT_ASCONF, | |
3855 | SCTP_NULL()); | |
1da177e4 | 3856 | return SCTP_DISPOSITION_CONSUME; |
c0786693 | 3857 | } |
1da177e4 LT |
3858 | |
3859 | abort = sctp_make_abort(asoc, asconf_ack, | |
d8238d9d | 3860 | sizeof(struct sctp_errhdr)); |
1da177e4 | 3861 | if (abort) { |
00f1c2df | 3862 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); |
1da177e4 LT |
3863 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
3864 | SCTP_CHUNK(abort)); | |
3865 | } | |
3866 | /* We are going to ABORT, so we might as well stop | |
3867 | * processing the rest of the chunks in the packet. | |
3868 | */ | |
cb3f837b | 3869 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 | 3870 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
d808ad9a | 3871 | SCTP_ERROR(ECONNABORTED)); |
1da177e4 | 3872 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 3873 | SCTP_PERR(SCTP_ERROR_ASCONF_ACK)); |
b01a2407 EB |
3874 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
3875 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
3876 | return SCTP_DISPOSITION_ABORT; |
3877 | } | |
3878 | ||
3879 | return SCTP_DISPOSITION_DISCARD; | |
3880 | } | |
3881 | ||
2040d3d7 | 3882 | /* RE-CONFIG Section 5.2 Upon reception of an RECONF Chunk. */ |
172a1599 XL |
3883 | enum sctp_disposition sctp_sf_do_reconf(struct net *net, |
3884 | const struct sctp_endpoint *ep, | |
3885 | const struct sctp_association *asoc, | |
3886 | const union sctp_subtype type, | |
3887 | void *arg, | |
3888 | struct sctp_cmd_seq *commands) | |
2040d3d7 XL |
3889 | { |
3890 | struct sctp_paramhdr *err_param = NULL; | |
3891 | struct sctp_chunk *chunk = arg; | |
3892 | struct sctp_reconf_chunk *hdr; | |
3893 | union sctp_params param; | |
3894 | ||
3895 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3896 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3897 | SCTP_NULL()); | |
3898 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); | |
3899 | } | |
3900 | ||
3901 | /* Make sure that the RECONF chunk has a valid length. */ | |
3902 | if (!sctp_chunk_length_valid(chunk, sizeof(*hdr))) | |
3903 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, | |
3904 | commands); | |
3905 | ||
3906 | if (!sctp_verify_reconf(asoc, chunk, &err_param)) | |
3907 | return sctp_sf_violation_paramlen(net, ep, asoc, type, arg, | |
3908 | (void *)err_param, commands); | |
3909 | ||
3910 | hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; | |
3911 | sctp_walk_params(param, hdr, params) { | |
3912 | struct sctp_chunk *reply = NULL; | |
3913 | struct sctp_ulpevent *ev = NULL; | |
3914 | ||
3915 | if (param.p->type == SCTP_PARAM_RESET_OUT_REQUEST) | |
3916 | reply = sctp_process_strreset_outreq( | |
3917 | (struct sctp_association *)asoc, param, &ev); | |
3918 | else if (param.p->type == SCTP_PARAM_RESET_IN_REQUEST) | |
3919 | reply = sctp_process_strreset_inreq( | |
3920 | (struct sctp_association *)asoc, param, &ev); | |
692787ce XL |
3921 | else if (param.p->type == SCTP_PARAM_RESET_TSN_REQUEST) |
3922 | reply = sctp_process_strreset_tsnreq( | |
3923 | (struct sctp_association *)asoc, param, &ev); | |
50a41591 XL |
3924 | else if (param.p->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) |
3925 | reply = sctp_process_strreset_addstrm_out( | |
3926 | (struct sctp_association *)asoc, param, &ev); | |
c5c4ebb3 XL |
3927 | else if (param.p->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) |
3928 | reply = sctp_process_strreset_addstrm_in( | |
3929 | (struct sctp_association *)asoc, param, &ev); | |
11ae76e6 XL |
3930 | else if (param.p->type == SCTP_PARAM_RESET_RESPONSE) |
3931 | reply = sctp_process_strreset_resp( | |
3932 | (struct sctp_association *)asoc, param, &ev); | |
2040d3d7 XL |
3933 | |
3934 | if (ev) | |
3935 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
3936 | SCTP_ULPEVENT(ev)); | |
3937 | ||
3938 | if (reply) | |
3939 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
3940 | SCTP_CHUNK(reply)); | |
3941 | } | |
3942 | ||
3943 | return SCTP_DISPOSITION_CONSUME; | |
3944 | } | |
3945 | ||
1da177e4 LT |
3946 | /* |
3947 | * PR-SCTP Section 3.6 Receiver Side Implementation of PR-SCTP | |
3948 | * | |
3949 | * When a FORWARD TSN chunk arrives, the data receiver MUST first update | |
3950 | * its cumulative TSN point to the value carried in the FORWARD TSN | |
3951 | * chunk, and then MUST further advance its cumulative TSN point locally | |
3952 | * if possible. | |
3953 | * After the above processing, the data receiver MUST stop reporting any | |
3954 | * missing TSNs earlier than or equal to the new cumulative TSN point. | |
3955 | * | |
3956 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
3957 | * | |
3958 | * The return value is the disposition of the chunk. | |
3959 | */ | |
172a1599 XL |
3960 | enum sctp_disposition sctp_sf_eat_fwd_tsn(struct net *net, |
3961 | const struct sctp_endpoint *ep, | |
3962 | const struct sctp_association *asoc, | |
3963 | const union sctp_subtype type, | |
3964 | void *arg, | |
3965 | struct sctp_cmd_seq *commands) | |
1da177e4 | 3966 | { |
1da177e4 | 3967 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 3968 | struct sctp_chunk *chunk = arg; |
9fcb95a1 | 3969 | struct sctp_fwdtsn_skip *skip; |
1da177e4 LT |
3970 | __u16 len; |
3971 | __u32 tsn; | |
3972 | ||
3973 | if (!sctp_vtag_verify(chunk, asoc)) { | |
3974 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
3975 | SCTP_NULL()); | |
24cb81a6 | 3976 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
3977 | } |
3978 | ||
d15c9ede XL |
3979 | if (!asoc->peer.prsctp_capable) |
3980 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
3981 | ||
1da177e4 LT |
3982 | /* Make sure that the FORWARD_TSN chunk has valid length. */ |
3983 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk))) | |
24cb81a6 | 3984 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
3985 | commands); |
3986 | ||
3987 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
3988 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
3989 | len = ntohs(chunk->chunk_hdr->length); | |
3990 | len -= sizeof(struct sctp_chunkhdr); | |
3991 | skb_pull(chunk->skb, len); | |
3992 | ||
3993 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 3994 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
3995 | |
3996 | /* The TSN is too high--silently discard the chunk and count on it | |
3997 | * getting retransmitted later. | |
3998 | */ | |
3999 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4000 | goto discard_noforce; | |
4001 | ||
9fcb95a1 WY |
4002 | /* Silently discard the chunk if stream-id is not valid */ |
4003 | sctp_walk_fwdtsn(skip, chunk) { | |
cee360ab | 4004 | if (ntohs(skip->stream) >= asoc->stream.incnt) |
9fcb95a1 WY |
4005 | goto discard_noforce; |
4006 | } | |
4007 | ||
1da177e4 LT |
4008 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
4009 | if (len > sizeof(struct sctp_fwdtsn_hdr)) | |
d808ad9a | 4010 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4011 | SCTP_CHUNK(chunk)); |
d808ad9a | 4012 | |
1da177e4 | 4013 | /* Count this as receiving DATA. */ |
9f70f46b | 4014 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) { |
1da177e4 LT |
4015 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
4016 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
4017 | } | |
d808ad9a | 4018 | |
1da177e4 | 4019 | /* FIXME: For now send a SACK, but DATA processing may |
d808ad9a | 4020 | * send another. |
1da177e4 LT |
4021 | */ |
4022 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_NOFORCE()); | |
1da177e4 LT |
4023 | |
4024 | return SCTP_DISPOSITION_CONSUME; | |
4025 | ||
4026 | discard_noforce: | |
4027 | return SCTP_DISPOSITION_DISCARD; | |
4028 | } | |
4029 | ||
172a1599 XL |
4030 | enum sctp_disposition sctp_sf_eat_fwd_tsn_fast( |
4031 | struct net *net, | |
4032 | const struct sctp_endpoint *ep, | |
4033 | const struct sctp_association *asoc, | |
4034 | const union sctp_subtype type, | |
4035 | void *arg, | |
4036 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4037 | { |
1da177e4 | 4038 | struct sctp_fwdtsn_hdr *fwdtsn_hdr; |
172a1599 | 4039 | struct sctp_chunk *chunk = arg; |
9fcb95a1 | 4040 | struct sctp_fwdtsn_skip *skip; |
1da177e4 LT |
4041 | __u16 len; |
4042 | __u32 tsn; | |
4043 | ||
4044 | if (!sctp_vtag_verify(chunk, asoc)) { | |
4045 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4046 | SCTP_NULL()); | |
24cb81a6 | 4047 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4048 | } |
4049 | ||
d15c9ede XL |
4050 | if (!asoc->peer.prsctp_capable) |
4051 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); | |
4052 | ||
1da177e4 LT |
4053 | /* Make sure that the FORWARD_TSN chunk has a valid length. */ |
4054 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_fwdtsn_chunk))) | |
24cb81a6 | 4055 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4056 | commands); |
4057 | ||
4058 | fwdtsn_hdr = (struct sctp_fwdtsn_hdr *)chunk->skb->data; | |
4059 | chunk->subh.fwdtsn_hdr = fwdtsn_hdr; | |
4060 | len = ntohs(chunk->chunk_hdr->length); | |
4061 | len -= sizeof(struct sctp_chunkhdr); | |
4062 | skb_pull(chunk->skb, len); | |
4063 | ||
4064 | tsn = ntohl(fwdtsn_hdr->new_cum_tsn); | |
bb33381d | 4065 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
4066 | |
4067 | /* The TSN is too high--silently discard the chunk and count on it | |
4068 | * getting retransmitted later. | |
4069 | */ | |
4070 | if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) | |
4071 | goto gen_shutdown; | |
4072 | ||
9fcb95a1 WY |
4073 | /* Silently discard the chunk if stream-id is not valid */ |
4074 | sctp_walk_fwdtsn(skip, chunk) { | |
cee360ab | 4075 | if (ntohs(skip->stream) >= asoc->stream.incnt) |
9fcb95a1 WY |
4076 | goto gen_shutdown; |
4077 | } | |
4078 | ||
1da177e4 LT |
4079 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); |
4080 | if (len > sizeof(struct sctp_fwdtsn_hdr)) | |
d808ad9a | 4081 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |
1da177e4 | 4082 | SCTP_CHUNK(chunk)); |
d808ad9a | 4083 | |
1da177e4 LT |
4084 | /* Go a head and force a SACK, since we are shutting down. */ |
4085 | gen_shutdown: | |
4086 | /* Implementor's Guide. | |
4087 | * | |
4088 | * While in SHUTDOWN-SENT state, the SHUTDOWN sender MUST immediately | |
4089 | * respond to each received packet containing one or more DATA chunk(s) | |
4090 | * with a SACK, a SHUTDOWN chunk, and restart the T2-shutdown timer | |
4091 | */ | |
4092 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SHUTDOWN, SCTP_NULL()); | |
4093 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); | |
4094 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
4095 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
4096 | ||
d808ad9a | 4097 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4098 | } |
4099 | ||
bbd0d598 | 4100 | /* |
25985edc | 4101 | * SCTP-AUTH Section 6.3 Receiving authenticated chukns |
bbd0d598 VY |
4102 | * |
4103 | * The receiver MUST use the HMAC algorithm indicated in the HMAC | |
4104 | * Identifier field. If this algorithm was not specified by the | |
4105 | * receiver in the HMAC-ALGO parameter in the INIT or INIT-ACK chunk | |
4106 | * during association setup, the AUTH chunk and all chunks after it MUST | |
4107 | * be discarded and an ERROR chunk SHOULD be sent with the error cause | |
4108 | * defined in Section 4.1. | |
4109 | * | |
4110 | * If an endpoint with no shared key receives a Shared Key Identifier | |
4111 | * other than 0, it MUST silently discard all authenticated chunks. If | |
4112 | * the endpoint has at least one endpoint pair shared key for the peer, | |
4113 | * it MUST use the key specified by the Shared Key Identifier if a | |
4114 | * key has been configured for that Shared Key Identifier. If no | |
4115 | * endpoint pair shared key has been configured for that Shared Key | |
4116 | * Identifier, all authenticated chunks MUST be silently discarded. | |
4117 | * | |
4118 | * Verification Tag: 8.5 Verification Tag [Normal verification] | |
4119 | * | |
4120 | * The return value is the disposition of the chunk. | |
4121 | */ | |
4785c7ae | 4122 | static enum sctp_ierror sctp_sf_authenticate( |
172a1599 | 4123 | const struct sctp_association *asoc, |
172a1599 | 4124 | struct sctp_chunk *chunk) |
bbd0d598 VY |
4125 | { |
4126 | struct sctp_authhdr *auth_hdr; | |
172a1599 | 4127 | __u8 *save_digest, *digest; |
bbd0d598 VY |
4128 | struct sctp_hmac *hmac; |
4129 | unsigned int sig_len; | |
4130 | __u16 key_id; | |
bbd0d598 VY |
4131 | |
4132 | /* Pull in the auth header, so we can do some more verification */ | |
4133 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
4134 | chunk->subh.auth_hdr = auth_hdr; | |
bb96dec7 | 4135 | skb_pull(chunk->skb, sizeof(*auth_hdr)); |
bbd0d598 | 4136 | |
02582e9b | 4137 | /* Make sure that we support the HMAC algorithm from the auth |
bbd0d598 VY |
4138 | * chunk. |
4139 | */ | |
4140 | if (!sctp_auth_asoc_verify_hmac_id(asoc, auth_hdr->hmac_id)) | |
4141 | return SCTP_IERROR_AUTH_BAD_HMAC; | |
4142 | ||
4143 | /* Make sure that the provided shared key identifier has been | |
4144 | * configured | |
4145 | */ | |
4146 | key_id = ntohs(auth_hdr->shkey_id); | |
4147 | if (key_id != asoc->active_key_id && !sctp_auth_get_shkey(asoc, key_id)) | |
4148 | return SCTP_IERROR_AUTH_BAD_KEYID; | |
4149 | ||
4150 | ||
4151 | /* Make sure that the length of the signature matches what | |
4152 | * we expect. | |
4153 | */ | |
bb96dec7 XL |
4154 | sig_len = ntohs(chunk->chunk_hdr->length) - |
4155 | sizeof(struct sctp_auth_chunk); | |
bbd0d598 VY |
4156 | hmac = sctp_auth_get_hmac(ntohs(auth_hdr->hmac_id)); |
4157 | if (sig_len != hmac->hmac_len) | |
4158 | return SCTP_IERROR_PROTO_VIOLATION; | |
4159 | ||
4160 | /* Now that we've done validation checks, we can compute and | |
4161 | * verify the hmac. The steps involved are: | |
4162 | * 1. Save the digest from the chunk. | |
4163 | * 2. Zero out the digest in the chunk. | |
4164 | * 3. Compute the new digest | |
4165 | * 4. Compare saved and new digests. | |
4166 | */ | |
4167 | digest = auth_hdr->hmac; | |
4168 | skb_pull(chunk->skb, sig_len); | |
4169 | ||
4170 | save_digest = kmemdup(digest, sig_len, GFP_ATOMIC); | |
4171 | if (!save_digest) | |
4172 | goto nomem; | |
4173 | ||
4174 | memset(digest, 0, sig_len); | |
4175 | ||
4176 | sctp_auth_calculate_hmac(asoc, chunk->skb, | |
bb96dec7 XL |
4177 | (struct sctp_auth_chunk *)chunk->chunk_hdr, |
4178 | GFP_ATOMIC); | |
bbd0d598 VY |
4179 | |
4180 | /* Discard the packet if the digests do not match */ | |
4181 | if (memcmp(save_digest, digest, sig_len)) { | |
4182 | kfree(save_digest); | |
4183 | return SCTP_IERROR_BAD_SIG; | |
4184 | } | |
4185 | ||
4186 | kfree(save_digest); | |
4187 | chunk->auth = 1; | |
4188 | ||
4189 | return SCTP_IERROR_NO_ERROR; | |
4190 | nomem: | |
4191 | return SCTP_IERROR_NOMEM; | |
4192 | } | |
4193 | ||
172a1599 XL |
4194 | enum sctp_disposition sctp_sf_eat_auth(struct net *net, |
4195 | const struct sctp_endpoint *ep, | |
4196 | const struct sctp_association *asoc, | |
4197 | const union sctp_subtype type, | |
4198 | void *arg, struct sctp_cmd_seq *commands) | |
bbd0d598 | 4199 | { |
bbd0d598 | 4200 | struct sctp_chunk *chunk = arg; |
4785c7ae | 4201 | struct sctp_authhdr *auth_hdr; |
bbd0d598 | 4202 | struct sctp_chunk *err_chunk; |
4785c7ae | 4203 | enum sctp_ierror error; |
bbd0d598 | 4204 | |
d2f19fa1 WY |
4205 | /* Make sure that the peer has AUTH capable */ |
4206 | if (!asoc->peer.auth_capable) | |
24cb81a6 | 4207 | return sctp_sf_unk_chunk(net, ep, asoc, type, arg, commands); |
d2f19fa1 | 4208 | |
bbd0d598 VY |
4209 | if (!sctp_vtag_verify(chunk, asoc)) { |
4210 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_BAD_TAG, | |
4211 | SCTP_NULL()); | |
24cb81a6 | 4212 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
bbd0d598 VY |
4213 | } |
4214 | ||
4215 | /* Make sure that the AUTH chunk has valid length. */ | |
4216 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_auth_chunk))) | |
24cb81a6 | 4217 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
bbd0d598 VY |
4218 | commands); |
4219 | ||
4220 | auth_hdr = (struct sctp_authhdr *)chunk->skb->data; | |
3b54f1fd | 4221 | error = sctp_sf_authenticate(asoc, chunk); |
bbd0d598 | 4222 | switch (error) { |
7fd71b1e JP |
4223 | case SCTP_IERROR_AUTH_BAD_HMAC: |
4224 | /* Generate the ERROR chunk and discard the rest | |
4225 | * of the packet | |
4226 | */ | |
4227 | err_chunk = sctp_make_op_error(asoc, chunk, | |
4228 | SCTP_ERROR_UNSUP_HMAC, | |
4229 | &auth_hdr->hmac_id, | |
4230 | sizeof(__u16), 0); | |
4231 | if (err_chunk) { | |
4232 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4233 | SCTP_CHUNK(err_chunk)); | |
4234 | } | |
4235 | /* Fall Through */ | |
4236 | case SCTP_IERROR_AUTH_BAD_KEYID: | |
4237 | case SCTP_IERROR_BAD_SIG: | |
24cb81a6 | 4238 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
7fd71b1e JP |
4239 | |
4240 | case SCTP_IERROR_PROTO_VIOLATION: | |
24cb81a6 | 4241 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
7fd71b1e JP |
4242 | commands); |
4243 | ||
4244 | case SCTP_IERROR_NOMEM: | |
4245 | return SCTP_DISPOSITION_NOMEM; | |
4246 | ||
4247 | default: /* Prevent gcc warnings */ | |
4248 | break; | |
bbd0d598 VY |
4249 | } |
4250 | ||
65b07e5d VY |
4251 | if (asoc->active_key_id != ntohs(auth_hdr->shkey_id)) { |
4252 | struct sctp_ulpevent *ev; | |
4253 | ||
4254 | ev = sctp_ulpevent_make_authkey(asoc, ntohs(auth_hdr->shkey_id), | |
4255 | SCTP_AUTH_NEWKEY, GFP_ATOMIC); | |
4256 | ||
4257 | if (!ev) | |
4258 | return -ENOMEM; | |
4259 | ||
4260 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
4261 | SCTP_ULPEVENT(ev)); | |
4262 | } | |
4263 | ||
bbd0d598 VY |
4264 | return SCTP_DISPOSITION_CONSUME; |
4265 | } | |
4266 | ||
1da177e4 LT |
4267 | /* |
4268 | * Process an unknown chunk. | |
4269 | * | |
4270 | * Section: 3.2. Also, 2.1 in the implementor's guide. | |
4271 | * | |
4272 | * Chunk Types are encoded such that the highest-order two bits specify | |
4273 | * the action that must be taken if the processing endpoint does not | |
4274 | * recognize the Chunk Type. | |
4275 | * | |
4276 | * 00 - Stop processing this SCTP packet and discard it, do not process | |
4277 | * any further chunks within it. | |
4278 | * | |
4279 | * 01 - Stop processing this SCTP packet and discard it, do not process | |
4280 | * any further chunks within it, and report the unrecognized | |
4281 | * chunk in an 'Unrecognized Chunk Type'. | |
4282 | * | |
4283 | * 10 - Skip this chunk and continue processing. | |
4284 | * | |
4285 | * 11 - Skip this chunk and continue processing, but report in an ERROR | |
4286 | * Chunk using the 'Unrecognized Chunk Type' cause of error. | |
4287 | * | |
4288 | * The return value is the disposition of the chunk. | |
4289 | */ | |
172a1599 XL |
4290 | enum sctp_disposition sctp_sf_unk_chunk(struct net *net, |
4291 | const struct sctp_endpoint *ep, | |
4292 | const struct sctp_association *asoc, | |
4293 | const union sctp_subtype type, | |
4294 | void *arg, | |
4295 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4296 | { |
4297 | struct sctp_chunk *unk_chunk = arg; | |
4298 | struct sctp_chunk *err_chunk; | |
922dbc5b | 4299 | struct sctp_chunkhdr *hdr; |
1da177e4 | 4300 | |
bb33381d | 4301 | pr_debug("%s: processing unknown chunk id:%d\n", __func__, type.chunk); |
1da177e4 LT |
4302 | |
4303 | if (!sctp_vtag_verify(unk_chunk, asoc)) | |
24cb81a6 | 4304 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
4305 | |
4306 | /* Make sure that the chunk has a valid length. | |
4307 | * Since we don't know the chunk type, we use a general | |
4308 | * chunkhdr structure to make a comparison. | |
4309 | */ | |
922dbc5b | 4310 | if (!sctp_chunk_length_valid(unk_chunk, sizeof(*hdr))) |
24cb81a6 | 4311 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
1da177e4 LT |
4312 | commands); |
4313 | ||
4314 | switch (type.chunk & SCTP_CID_ACTION_MASK) { | |
4315 | case SCTP_CID_ACTION_DISCARD: | |
4316 | /* Discard the packet. */ | |
24cb81a6 | 4317 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4318 | case SCTP_CID_ACTION_DISCARD_ERR: |
1da177e4 LT |
4319 | /* Generate an ERROR chunk as response. */ |
4320 | hdr = unk_chunk->chunk_hdr; | |
4321 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4322 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4323 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4324 | 0); |
1da177e4 LT |
4325 | if (err_chunk) { |
4326 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4327 | SCTP_CHUNK(err_chunk)); | |
4328 | } | |
2e3216cd VY |
4329 | |
4330 | /* Discard the packet. */ | |
24cb81a6 | 4331 | sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); |
1da177e4 | 4332 | return SCTP_DISPOSITION_CONSUME; |
1da177e4 LT |
4333 | case SCTP_CID_ACTION_SKIP: |
4334 | /* Skip the chunk. */ | |
4335 | return SCTP_DISPOSITION_DISCARD; | |
1da177e4 LT |
4336 | case SCTP_CID_ACTION_SKIP_ERR: |
4337 | /* Generate an ERROR chunk as response. */ | |
4338 | hdr = unk_chunk->chunk_hdr; | |
4339 | err_chunk = sctp_make_op_error(asoc, unk_chunk, | |
4340 | SCTP_ERROR_UNKNOWN_CHUNK, hdr, | |
e2f036a9 | 4341 | SCTP_PAD4(ntohs(hdr->length)), |
6383cfb3 | 4342 | 0); |
1da177e4 LT |
4343 | if (err_chunk) { |
4344 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
4345 | SCTP_CHUNK(err_chunk)); | |
4346 | } | |
4347 | /* Skip the chunk. */ | |
4348 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
4349 | default: |
4350 | break; | |
4351 | } | |
4352 | ||
4353 | return SCTP_DISPOSITION_DISCARD; | |
4354 | } | |
4355 | ||
4356 | /* | |
4357 | * Discard the chunk. | |
4358 | * | |
4359 | * Section: 0.2, 5.2.3, 5.2.5, 5.2.6, 6.0, 8.4.6, 8.5.1c, 9.2 | |
4360 | * [Too numerous to mention...] | |
4361 | * Verification Tag: No verification needed. | |
4362 | * Inputs | |
4363 | * (endpoint, asoc, chunk) | |
4364 | * | |
4365 | * Outputs | |
4366 | * (asoc, reply_msg, msg_up, timers, counters) | |
4367 | * | |
4368 | * The return value is the disposition of the chunk. | |
4369 | */ | |
172a1599 XL |
4370 | enum sctp_disposition sctp_sf_discard_chunk(struct net *net, |
4371 | const struct sctp_endpoint *ep, | |
4372 | const struct sctp_association *asoc, | |
4373 | const union sctp_subtype type, | |
4374 | void *arg, | |
4375 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4376 | { |
ece25dfa VY |
4377 | struct sctp_chunk *chunk = arg; |
4378 | ||
4379 | /* Make sure that the chunk has a valid length. | |
4380 | * Since we don't know the chunk type, we use a general | |
4381 | * chunkhdr structure to make a comparison. | |
4382 | */ | |
922dbc5b | 4383 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4384 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4385 | commands); |
4386 | ||
bb33381d DB |
4387 | pr_debug("%s: chunk:%d is discarded\n", __func__, type.chunk); |
4388 | ||
1da177e4 LT |
4389 | return SCTP_DISPOSITION_DISCARD; |
4390 | } | |
4391 | ||
4392 | /* | |
4393 | * Discard the whole packet. | |
4394 | * | |
4395 | * Section: 8.4 2) | |
4396 | * | |
4397 | * 2) If the OOTB packet contains an ABORT chunk, the receiver MUST | |
4398 | * silently discard the OOTB packet and take no further action. | |
1da177e4 LT |
4399 | * |
4400 | * Verification Tag: No verification necessary | |
4401 | * | |
4402 | * Inputs | |
4403 | * (endpoint, asoc, chunk) | |
4404 | * | |
4405 | * Outputs | |
4406 | * (asoc, reply_msg, msg_up, timers, counters) | |
4407 | * | |
4408 | * The return value is the disposition of the chunk. | |
4409 | */ | |
172a1599 XL |
4410 | enum sctp_disposition sctp_sf_pdiscard(struct net *net, |
4411 | const struct sctp_endpoint *ep, | |
4412 | const struct sctp_association *asoc, | |
4413 | const union sctp_subtype type, | |
4414 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 | 4415 | { |
24cb81a6 | 4416 | SCTP_INC_STATS(net, SCTP_MIB_IN_PKT_DISCARDS); |
1da177e4 LT |
4417 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
4418 | ||
4419 | return SCTP_DISPOSITION_CONSUME; | |
4420 | } | |
4421 | ||
4422 | ||
4423 | /* | |
4424 | * The other end is violating protocol. | |
4425 | * | |
4426 | * Section: Not specified | |
4427 | * Verification Tag: Not specified | |
4428 | * Inputs | |
4429 | * (endpoint, asoc, chunk) | |
4430 | * | |
4431 | * Outputs | |
4432 | * (asoc, reply_msg, msg_up, timers, counters) | |
4433 | * | |
4434 | * We simply tag the chunk as a violation. The state machine will log | |
4435 | * the violation and continue. | |
4436 | */ | |
172a1599 XL |
4437 | enum sctp_disposition sctp_sf_violation(struct net *net, |
4438 | const struct sctp_endpoint *ep, | |
4439 | const struct sctp_association *asoc, | |
4440 | const union sctp_subtype type, | |
4441 | void *arg, | |
4442 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4443 | { |
ece25dfa VY |
4444 | struct sctp_chunk *chunk = arg; |
4445 | ||
4446 | /* Make sure that the chunk has a valid length. */ | |
922dbc5b | 4447 | if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_chunkhdr))) |
24cb81a6 | 4448 | return sctp_sf_violation_chunklen(net, ep, asoc, type, arg, |
ece25dfa VY |
4449 | commands); |
4450 | ||
1da177e4 LT |
4451 | return SCTP_DISPOSITION_VIOLATION; |
4452 | } | |
4453 | ||
1da177e4 | 4454 | /* |
aecedeab | 4455 | * Common function to handle a protocol violation. |
1da177e4 | 4456 | */ |
172a1599 XL |
4457 | static enum sctp_disposition sctp_sf_abort_violation( |
4458 | struct net *net, | |
4459 | const struct sctp_endpoint *ep, | |
4460 | const struct sctp_association *asoc, | |
4461 | void *arg, | |
4462 | struct sctp_cmd_seq *commands, | |
4463 | const __u8 *payload, | |
4464 | const size_t paylen) | |
1da177e4 | 4465 | { |
ece25dfa | 4466 | struct sctp_packet *packet = NULL; |
1da177e4 LT |
4467 | struct sctp_chunk *chunk = arg; |
4468 | struct sctp_chunk *abort = NULL; | |
1da177e4 | 4469 | |
bbd0d598 VY |
4470 | /* SCTP-AUTH, Section 6.3: |
4471 | * It should be noted that if the receiver wants to tear | |
4472 | * down an association in an authenticated way only, the | |
4473 | * handling of malformed packets should not result in | |
4474 | * tearing down the association. | |
4475 | * | |
4476 | * This means that if we only want to abort associations | |
4477 | * in an authenticated way (i.e AUTH+ABORT), then we | |
25985edc | 4478 | * can't destroy this association just because the packet |
bbd0d598 VY |
4479 | * was malformed. |
4480 | */ | |
4481 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) | |
4482 | goto discard; | |
4483 | ||
9abed245 JJ |
4484 | /* Make the abort chunk. */ |
4485 | abort = sctp_make_abort_violation(asoc, chunk, payload, paylen); | |
4486 | if (!abort) | |
4487 | goto nomem; | |
4488 | ||
ece25dfa | 4489 | if (asoc) { |
f4ad85ca GJ |
4490 | /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ |
4491 | if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && | |
4492 | !asoc->peer.i.init_tag) { | |
cb1844c4 | 4493 | struct sctp_initack_chunk *initack; |
f4ad85ca | 4494 | |
cb1844c4 XL |
4495 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
4496 | if (!sctp_chunk_length_valid(chunk, sizeof(*initack))) | |
f4ad85ca GJ |
4497 | abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; |
4498 | else { | |
4499 | unsigned int inittag; | |
4500 | ||
4501 | inittag = ntohl(initack->init_hdr.init_tag); | |
4502 | sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, | |
4503 | SCTP_U32(inittag)); | |
4504 | } | |
4505 | } | |
4506 | ||
ece25dfa | 4507 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); |
b01a2407 | 4508 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 | 4509 | |
ece25dfa VY |
4510 | if (asoc->state <= SCTP_STATE_COOKIE_ECHOED) { |
4511 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
4512 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4513 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4514 | SCTP_ERROR(ECONNREFUSED)); | |
4515 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
4516 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
4517 | } else { | |
4518 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4519 | SCTP_ERROR(ECONNABORTED)); | |
4520 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4521 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 | 4522 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
ece25dfa | 4523 | } |
1da177e4 | 4524 | } else { |
2ce95503 | 4525 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
ece25dfa VY |
4526 | |
4527 | if (!packet) | |
4528 | goto nomem_pkt; | |
4529 | ||
4530 | if (sctp_test_T_bit(abort)) | |
4531 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
4532 | ||
4533 | abort->skb->sk = ep->base.sk; | |
4534 | ||
4535 | sctp_packet_append_chunk(packet, abort); | |
4536 | ||
4537 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
4538 | SCTP_PACKET(packet)); | |
4539 | ||
b01a2407 | 4540 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
4541 | } |
4542 | ||
b01a2407 | 4543 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
d808ad9a | 4544 | |
56eb82bb | 4545 | discard: |
24cb81a6 | 4546 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
1da177e4 LT |
4547 | return SCTP_DISPOSITION_ABORT; |
4548 | ||
ece25dfa VY |
4549 | nomem_pkt: |
4550 | sctp_chunk_free(abort); | |
1da177e4 LT |
4551 | nomem: |
4552 | return SCTP_DISPOSITION_NOMEM; | |
4553 | } | |
4554 | ||
aecedeab WY |
4555 | /* |
4556 | * Handle a protocol violation when the chunk length is invalid. | |
025dfdaf | 4557 | * "Invalid" length is identified as smaller than the minimal length a |
aecedeab | 4558 | * given chunk can be. For example, a SACK chunk has invalid length |
d4d6c614 | 4559 | * if its length is set to be smaller than the size of struct sctp_sack_chunk. |
aecedeab WY |
4560 | * |
4561 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4562 | * error code. | |
4563 | * | |
4564 | * Section: Not specified | |
4565 | * Verification Tag: Nothing to do | |
4566 | * Inputs | |
4567 | * (endpoint, asoc, chunk) | |
4568 | * | |
4569 | * Outputs | |
4570 | * (reply_msg, msg_up, counters) | |
4571 | * | |
4572 | * Generate an ABORT chunk and terminate the association. | |
4573 | */ | |
172a1599 XL |
4574 | static enum sctp_disposition sctp_sf_violation_chunklen( |
4575 | struct net *net, | |
4576 | const struct sctp_endpoint *ep, | |
4577 | const struct sctp_association *asoc, | |
4578 | const union sctp_subtype type, | |
4579 | void *arg, | |
4580 | struct sctp_cmd_seq *commands) | |
aecedeab | 4581 | { |
cb3f837b | 4582 | static const char err_str[] = "The following chunk had invalid length:"; |
aecedeab | 4583 | |
24cb81a6 | 4584 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4585 | sizeof(err_str)); |
aecedeab WY |
4586 | } |
4587 | ||
6f4c618d WY |
4588 | /* |
4589 | * Handle a protocol violation when the parameter length is invalid. | |
33c7cfdb SW |
4590 | * If the length is smaller than the minimum length of a given parameter, |
4591 | * or accumulated length in multi parameters exceeds the end of the chunk, | |
4592 | * the length is considered as invalid. | |
6f4c618d | 4593 | */ |
172a1599 XL |
4594 | static enum sctp_disposition sctp_sf_violation_paramlen( |
4595 | struct net *net, | |
4596 | const struct sctp_endpoint *ep, | |
4597 | const struct sctp_association *asoc, | |
4598 | const union sctp_subtype type, | |
4599 | void *arg, void *ext, | |
4600 | struct sctp_cmd_seq *commands) | |
ba016670 | 4601 | { |
ba016670 WY |
4602 | struct sctp_paramhdr *param = ext; |
4603 | struct sctp_chunk *abort = NULL; | |
172a1599 | 4604 | struct sctp_chunk *chunk = arg; |
6f4c618d | 4605 | |
ba016670 WY |
4606 | if (sctp_auth_recv_cid(SCTP_CID_ABORT, asoc)) |
4607 | goto discard; | |
4608 | ||
4609 | /* Make the abort chunk. */ | |
4610 | abort = sctp_make_violation_paramlen(asoc, chunk, param); | |
4611 | if (!abort) | |
4612 | goto nomem; | |
4613 | ||
4614 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
b01a2407 | 4615 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
ba016670 WY |
4616 | |
4617 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
4618 | SCTP_ERROR(ECONNABORTED)); | |
4619 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
4620 | SCTP_PERR(SCTP_ERROR_PROTO_VIOLATION)); | |
b01a2407 EB |
4621 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); |
4622 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
ba016670 WY |
4623 | |
4624 | discard: | |
24cb81a6 | 4625 | sctp_sf_pdiscard(net, ep, asoc, SCTP_ST_CHUNK(0), arg, commands); |
ba016670 WY |
4626 | return SCTP_DISPOSITION_ABORT; |
4627 | nomem: | |
4628 | return SCTP_DISPOSITION_NOMEM; | |
6f4c618d WY |
4629 | } |
4630 | ||
aecedeab WY |
4631 | /* Handle a protocol violation when the peer trying to advance the |
4632 | * cumulative tsn ack to a point beyond the max tsn currently sent. | |
4633 | * | |
4634 | * We inform the other end by sending an ABORT with a Protocol Violation | |
4635 | * error code. | |
4636 | */ | |
172a1599 XL |
4637 | static enum sctp_disposition sctp_sf_violation_ctsn( |
4638 | struct net *net, | |
4639 | const struct sctp_endpoint *ep, | |
4640 | const struct sctp_association *asoc, | |
4641 | const union sctp_subtype type, | |
4642 | void *arg, | |
4643 | struct sctp_cmd_seq *commands) | |
aecedeab | 4644 | { |
cb3f837b | 4645 | static const char err_str[] = "The cumulative tsn ack beyond the max tsn currently sent:"; |
aecedeab | 4646 | |
24cb81a6 | 4647 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4648 | sizeof(err_str)); |
aecedeab WY |
4649 | } |
4650 | ||
ece25dfa | 4651 | /* Handle protocol violation of an invalid chunk bundling. For example, |
25985edc | 4652 | * when we have an association and we receive bundled INIT-ACK, or |
ece25dfa | 4653 | * SHUDOWN-COMPLETE, our peer is clearly violationg the "MUST NOT bundle" |
25985edc | 4654 | * statement from the specs. Additionally, there might be an attacker |
ece25dfa VY |
4655 | * on the path and we may not want to continue this communication. |
4656 | */ | |
172a1599 XL |
4657 | static enum sctp_disposition sctp_sf_violation_chunk( |
4658 | struct net *net, | |
4659 | const struct sctp_endpoint *ep, | |
4660 | const struct sctp_association *asoc, | |
4661 | const union sctp_subtype type, | |
4662 | void *arg, | |
4663 | struct sctp_cmd_seq *commands) | |
ece25dfa | 4664 | { |
cb3f837b | 4665 | static const char err_str[] = "The following chunk violates protocol:"; |
ece25dfa VY |
4666 | |
4667 | if (!asoc) | |
24cb81a6 | 4668 | return sctp_sf_violation(net, ep, asoc, type, arg, commands); |
ece25dfa | 4669 | |
24cb81a6 | 4670 | return sctp_sf_abort_violation(net, ep, asoc, arg, commands, err_str, |
172a1599 | 4671 | sizeof(err_str)); |
ece25dfa | 4672 | } |
1da177e4 LT |
4673 | /*************************************************************************** |
4674 | * These are the state functions for handling primitive (Section 10) events. | |
4675 | ***************************************************************************/ | |
4676 | /* | |
4677 | * sctp_sf_do_prm_asoc | |
4678 | * | |
4679 | * Section: 10.1 ULP-to-SCTP | |
4680 | * B) Associate | |
4681 | * | |
4682 | * Format: ASSOCIATE(local SCTP instance name, destination transport addr, | |
4683 | * outbound stream count) | |
4684 | * -> association id [,destination transport addr list] [,outbound stream | |
4685 | * count] | |
4686 | * | |
4687 | * This primitive allows the upper layer to initiate an association to a | |
4688 | * specific peer endpoint. | |
4689 | * | |
4690 | * The peer endpoint shall be specified by one of the transport addresses | |
4691 | * which defines the endpoint (see Section 1.4). If the local SCTP | |
4692 | * instance has not been initialized, the ASSOCIATE is considered an | |
4693 | * error. | |
4694 | * [This is not relevant for the kernel implementation since we do all | |
4695 | * initialization at boot time. It we hadn't initialized we wouldn't | |
4696 | * get anywhere near this code.] | |
4697 | * | |
4698 | * An association id, which is a local handle to the SCTP association, | |
4699 | * will be returned on successful establishment of the association. If | |
4700 | * SCTP is not able to open an SCTP association with the peer endpoint, | |
4701 | * an error is returned. | |
4702 | * [In the kernel implementation, the struct sctp_association needs to | |
4703 | * be created BEFORE causing this primitive to run.] | |
4704 | * | |
4705 | * Other association parameters may be returned, including the | |
4706 | * complete destination transport addresses of the peer as well as the | |
4707 | * outbound stream count of the local endpoint. One of the transport | |
4708 | * address from the returned destination addresses will be selected by | |
4709 | * the local endpoint as default primary path for sending SCTP packets | |
4710 | * to this peer. The returned "destination transport addr list" can | |
4711 | * be used by the ULP to change the default primary path or to force | |
4712 | * sending a packet to a specific transport address. [All of this | |
4713 | * stuff happens when the INIT ACK arrives. This is a NON-BLOCKING | |
4714 | * function.] | |
4715 | * | |
4716 | * Mandatory attributes: | |
4717 | * | |
4718 | * o local SCTP instance name - obtained from the INITIALIZE operation. | |
4719 | * [This is the argument asoc.] | |
4720 | * o destination transport addr - specified as one of the transport | |
4721 | * addresses of the peer endpoint with which the association is to be | |
4722 | * established. | |
4723 | * [This is asoc->peer.active_path.] | |
4724 | * o outbound stream count - the number of outbound streams the ULP | |
4725 | * would like to open towards this peer endpoint. | |
4726 | * [BUG: This is not currently implemented.] | |
4727 | * Optional attributes: | |
4728 | * | |
4729 | * None. | |
4730 | * | |
4731 | * The return value is a disposition. | |
4732 | */ | |
172a1599 XL |
4733 | enum sctp_disposition sctp_sf_do_prm_asoc(struct net *net, |
4734 | const struct sctp_endpoint *ep, | |
4735 | const struct sctp_association *asoc, | |
4736 | const union sctp_subtype type, | |
4737 | void *arg, | |
4738 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4739 | { |
26ac8e5f | 4740 | struct sctp_association *my_asoc; |
172a1599 | 4741 | struct sctp_chunk *repl; |
1da177e4 LT |
4742 | |
4743 | /* The comment below says that we enter COOKIE-WAIT AFTER | |
4744 | * sending the INIT, but that doesn't actually work in our | |
4745 | * implementation... | |
4746 | */ | |
4747 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4748 | SCTP_STATE(SCTP_STATE_COOKIE_WAIT)); | |
4749 | ||
4750 | /* RFC 2960 5.1 Normal Establishment of an Association | |
4751 | * | |
4752 | * A) "A" first sends an INIT chunk to "Z". In the INIT, "A" | |
4753 | * must provide its Verification Tag (Tag_A) in the Initiate | |
4754 | * Tag field. Tag_A SHOULD be a random number in the range of | |
4755 | * 1 to 4294967295 (see 5.3.1 for Tag value selection). ... | |
4756 | */ | |
4757 | ||
4758 | repl = sctp_make_init(asoc, &asoc->base.bind_addr, GFP_ATOMIC, 0); | |
4759 | if (!repl) | |
4760 | goto nomem; | |
4761 | ||
405426f6 DB |
4762 | /* Choose transport for INIT. */ |
4763 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
4764 | SCTP_CHUNK(repl)); | |
4765 | ||
1da177e4 LT |
4766 | /* Cast away the const modifier, as we want to just |
4767 | * rerun it through as a sideffect. | |
4768 | */ | |
ab38fb04 VY |
4769 | my_asoc = (struct sctp_association *)asoc; |
4770 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc)); | |
1da177e4 LT |
4771 | |
4772 | /* After sending the INIT, "A" starts the T1-init timer and | |
4773 | * enters the COOKIE-WAIT state. | |
4774 | */ | |
4775 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
4776 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
4777 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
4778 | return SCTP_DISPOSITION_CONSUME; | |
4779 | ||
4780 | nomem: | |
4781 | return SCTP_DISPOSITION_NOMEM; | |
4782 | } | |
4783 | ||
4784 | /* | |
4785 | * Process the SEND primitive. | |
4786 | * | |
4787 | * Section: 10.1 ULP-to-SCTP | |
4788 | * E) Send | |
4789 | * | |
4790 | * Format: SEND(association id, buffer address, byte count [,context] | |
4791 | * [,stream id] [,life time] [,destination transport address] | |
4792 | * [,unorder flag] [,no-bundle flag] [,payload protocol-id] ) | |
4793 | * -> result | |
4794 | * | |
4795 | * This is the main method to send user data via SCTP. | |
4796 | * | |
4797 | * Mandatory attributes: | |
4798 | * | |
4799 | * o association id - local handle to the SCTP association | |
4800 | * | |
4801 | * o buffer address - the location where the user message to be | |
4802 | * transmitted is stored; | |
4803 | * | |
4804 | * o byte count - The size of the user data in number of bytes; | |
4805 | * | |
4806 | * Optional attributes: | |
4807 | * | |
4808 | * o context - an optional 32 bit integer that will be carried in the | |
4809 | * sending failure notification to the ULP if the transportation of | |
4810 | * this User Message fails. | |
4811 | * | |
4812 | * o stream id - to indicate which stream to send the data on. If not | |
4813 | * specified, stream 0 will be used. | |
4814 | * | |
4815 | * o life time - specifies the life time of the user data. The user data | |
4816 | * will not be sent by SCTP after the life time expires. This | |
4817 | * parameter can be used to avoid efforts to transmit stale | |
4818 | * user messages. SCTP notifies the ULP if the data cannot be | |
4819 | * initiated to transport (i.e. sent to the destination via SCTP's | |
4820 | * send primitive) within the life time variable. However, the | |
4821 | * user data will be transmitted if SCTP has attempted to transmit a | |
4822 | * chunk before the life time expired. | |
4823 | * | |
4824 | * o destination transport address - specified as one of the destination | |
4825 | * transport addresses of the peer endpoint to which this packet | |
4826 | * should be sent. Whenever possible, SCTP should use this destination | |
4827 | * transport address for sending the packets, instead of the current | |
4828 | * primary path. | |
4829 | * | |
4830 | * o unorder flag - this flag, if present, indicates that the user | |
4831 | * would like the data delivered in an unordered fashion to the peer | |
4832 | * (i.e., the U flag is set to 1 on all DATA chunks carrying this | |
4833 | * message). | |
4834 | * | |
4835 | * o no-bundle flag - instructs SCTP not to bundle this user data with | |
4836 | * other outbound DATA chunks. SCTP MAY still bundle even when | |
4837 | * this flag is present, when faced with network congestion. | |
4838 | * | |
4839 | * o payload protocol-id - A 32 bit unsigned integer that is to be | |
4840 | * passed to the peer indicating the type of payload protocol data | |
4841 | * being transmitted. This value is passed as opaque data by SCTP. | |
4842 | * | |
4843 | * The return value is the disposition. | |
4844 | */ | |
172a1599 XL |
4845 | enum sctp_disposition sctp_sf_do_prm_send(struct net *net, |
4846 | const struct sctp_endpoint *ep, | |
4847 | const struct sctp_association *asoc, | |
4848 | const union sctp_subtype type, | |
4849 | void *arg, | |
4850 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4851 | { |
9c5c62be | 4852 | struct sctp_datamsg *msg = arg; |
1da177e4 | 4853 | |
9c5c62be | 4854 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_MSG, SCTP_DATAMSG(msg)); |
1da177e4 LT |
4855 | return SCTP_DISPOSITION_CONSUME; |
4856 | } | |
4857 | ||
4858 | /* | |
4859 | * Process the SHUTDOWN primitive. | |
4860 | * | |
4861 | * Section: 10.1: | |
4862 | * C) Shutdown | |
4863 | * | |
4864 | * Format: SHUTDOWN(association id) | |
4865 | * -> result | |
4866 | * | |
4867 | * Gracefully closes an association. Any locally queued user data | |
4868 | * will be delivered to the peer. The association will be terminated only | |
4869 | * after the peer acknowledges all the SCTP packets sent. A success code | |
4870 | * will be returned on successful termination of the association. If | |
4871 | * attempting to terminate the association results in a failure, an error | |
4872 | * code shall be returned. | |
4873 | * | |
4874 | * Mandatory attributes: | |
4875 | * | |
4876 | * o association id - local handle to the SCTP association | |
4877 | * | |
4878 | * Optional attributes: | |
4879 | * | |
4880 | * None. | |
4881 | * | |
4882 | * The return value is the disposition. | |
4883 | */ | |
172a1599 XL |
4884 | enum sctp_disposition sctp_sf_do_9_2_prm_shutdown( |
4885 | struct net *net, | |
4886 | const struct sctp_endpoint *ep, | |
4887 | const struct sctp_association *asoc, | |
4888 | const union sctp_subtype type, | |
4889 | void *arg, | |
4890 | struct sctp_cmd_seq *commands) | |
1da177e4 | 4891 | { |
172a1599 | 4892 | enum sctp_disposition disposition; |
1da177e4 LT |
4893 | |
4894 | /* From 9.2 Shutdown of an Association | |
4895 | * Upon receipt of the SHUTDOWN primitive from its upper | |
4896 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
4897 | * remains there until all outstanding data has been | |
4898 | * acknowledged by its peer. The endpoint accepts no new data | |
4899 | * from its upper layer, but retransmits data to the far end | |
4900 | * if necessary to fill gaps. | |
4901 | */ | |
4902 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
4903 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
4904 | ||
1da177e4 LT |
4905 | disposition = SCTP_DISPOSITION_CONSUME; |
4906 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 4907 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
4908 | arg, commands); |
4909 | } | |
172a1599 | 4910 | |
1da177e4 LT |
4911 | return disposition; |
4912 | } | |
4913 | ||
4914 | /* | |
4915 | * Process the ABORT primitive. | |
4916 | * | |
4917 | * Section: 10.1: | |
4918 | * C) Abort | |
4919 | * | |
4920 | * Format: Abort(association id [, cause code]) | |
4921 | * -> result | |
4922 | * | |
4923 | * Ungracefully closes an association. Any locally queued user data | |
4924 | * will be discarded and an ABORT chunk is sent to the peer. A success code | |
4925 | * will be returned on successful abortion of the association. If | |
4926 | * attempting to abort the association results in a failure, an error | |
4927 | * code shall be returned. | |
4928 | * | |
4929 | * Mandatory attributes: | |
4930 | * | |
4931 | * o association id - local handle to the SCTP association | |
4932 | * | |
4933 | * Optional attributes: | |
4934 | * | |
4935 | * o cause code - reason of the abort to be passed to the peer | |
4936 | * | |
4937 | * None. | |
4938 | * | |
4939 | * The return value is the disposition. | |
4940 | */ | |
172a1599 XL |
4941 | enum sctp_disposition sctp_sf_do_9_1_prm_abort( |
4942 | struct net *net, | |
4943 | const struct sctp_endpoint *ep, | |
4944 | const struct sctp_association *asoc, | |
4945 | const union sctp_subtype type, | |
4946 | void *arg, | |
4947 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4948 | { |
4949 | /* From 9.1 Abort of an Association | |
4950 | * Upon receipt of the ABORT primitive from its upper | |
4951 | * layer, the endpoint enters CLOSED state and | |
4952 | * discard all outstanding data has been | |
4953 | * acknowledged by its peer. The endpoint accepts no new data | |
4954 | * from its upper layer, but retransmits data to the far end | |
4955 | * if necessary to fill gaps. | |
4956 | */ | |
c164a9ba | 4957 | struct sctp_chunk *abort = arg; |
1da177e4 | 4958 | |
068d8bd3 XL |
4959 | if (abort) |
4960 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
4961 | |
4962 | /* Even if we can't send the ABORT due to low memory delete the | |
4963 | * TCB. This is a departure from our typical NOMEM handling. | |
4964 | */ | |
4965 | ||
8de8c873 SS |
4966 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
4967 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 LT |
4968 | /* Delete the established association. */ |
4969 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 4970 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 4971 | |
b01a2407 EB |
4972 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
4973 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 | 4974 | |
649621e3 | 4975 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
4976 | } |
4977 | ||
4978 | /* We tried an illegal operation on an association which is closed. */ | |
172a1599 XL |
4979 | enum sctp_disposition sctp_sf_error_closed(struct net *net, |
4980 | const struct sctp_endpoint *ep, | |
4981 | const struct sctp_association *asoc, | |
4982 | const union sctp_subtype type, | |
4983 | void *arg, | |
4984 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
4985 | { |
4986 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, SCTP_ERROR(-EINVAL)); | |
4987 | return SCTP_DISPOSITION_CONSUME; | |
4988 | } | |
4989 | ||
4990 | /* We tried an illegal operation on an association which is shutting | |
4991 | * down. | |
4992 | */ | |
172a1599 XL |
4993 | enum sctp_disposition sctp_sf_error_shutdown( |
4994 | struct net *net, | |
4995 | const struct sctp_endpoint *ep, | |
4996 | const struct sctp_association *asoc, | |
4997 | const union sctp_subtype type, | |
4998 | void *arg, | |
4999 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5000 | { |
5001 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_ERROR, | |
5002 | SCTP_ERROR(-ESHUTDOWN)); | |
5003 | return SCTP_DISPOSITION_CONSUME; | |
5004 | } | |
5005 | ||
5006 | /* | |
5007 | * sctp_cookie_wait_prm_shutdown | |
5008 | * | |
5009 | * Section: 4 Note: 2 | |
5010 | * Verification Tag: | |
5011 | * Inputs | |
5012 | * (endpoint, asoc) | |
5013 | * | |
5014 | * The RFC does not explicitly address this issue, but is the route through the | |
5015 | * state table when someone issues a shutdown while in COOKIE_WAIT state. | |
5016 | * | |
5017 | * Outputs | |
5018 | * (timers) | |
5019 | */ | |
172a1599 XL |
5020 | enum sctp_disposition sctp_sf_cookie_wait_prm_shutdown( |
5021 | struct net *net, | |
5022 | const struct sctp_endpoint *ep, | |
5023 | const struct sctp_association *asoc, | |
5024 | const union sctp_subtype type, | |
5025 | void *arg, | |
5026 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5027 | { |
5028 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5029 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5030 | ||
5031 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5032 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5033 | ||
b01a2407 | 5034 | SCTP_INC_STATS(net, SCTP_MIB_SHUTDOWNS); |
1da177e4 LT |
5035 | |
5036 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
5037 | ||
5038 | return SCTP_DISPOSITION_DELETE_TCB; | |
5039 | } | |
5040 | ||
5041 | /* | |
5042 | * sctp_cookie_echoed_prm_shutdown | |
5043 | * | |
5044 | * Section: 4 Note: 2 | |
5045 | * Verification Tag: | |
5046 | * Inputs | |
5047 | * (endpoint, asoc) | |
5048 | * | |
5049 | * The RFC does not explcitly address this issue, but is the route through the | |
5050 | * state table when someone issues a shutdown while in COOKIE_ECHOED state. | |
5051 | * | |
5052 | * Outputs | |
5053 | * (timers) | |
5054 | */ | |
172a1599 XL |
5055 | enum sctp_disposition sctp_sf_cookie_echoed_prm_shutdown( |
5056 | struct net *net, | |
5057 | const struct sctp_endpoint *ep, | |
5058 | const struct sctp_association *asoc, | |
5059 | const union sctp_subtype type, | |
5060 | void *arg, | |
5061 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5062 | { |
5063 | /* There is a single T1 timer, so we should be able to use | |
5064 | * common function with the COOKIE-WAIT state. | |
5065 | */ | |
24cb81a6 | 5066 | return sctp_sf_cookie_wait_prm_shutdown(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5067 | } |
5068 | ||
5069 | /* | |
5070 | * sctp_sf_cookie_wait_prm_abort | |
5071 | * | |
5072 | * Section: 4 Note: 2 | |
5073 | * Verification Tag: | |
5074 | * Inputs | |
5075 | * (endpoint, asoc) | |
5076 | * | |
5077 | * The RFC does not explicitly address this issue, but is the route through the | |
5078 | * state table when someone issues an abort while in COOKIE_WAIT state. | |
5079 | * | |
5080 | * Outputs | |
5081 | * (timers) | |
5082 | */ | |
172a1599 XL |
5083 | enum sctp_disposition sctp_sf_cookie_wait_prm_abort( |
5084 | struct net *net, | |
5085 | const struct sctp_endpoint *ep, | |
5086 | const struct sctp_association *asoc, | |
5087 | const union sctp_subtype type, | |
5088 | void *arg, | |
5089 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5090 | { |
c164a9ba | 5091 | struct sctp_chunk *abort = arg; |
1da177e4 LT |
5092 | |
5093 | /* Stop T1-init timer */ | |
5094 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5095 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1da177e4 | 5096 | |
068d8bd3 XL |
5097 | if (abort) |
5098 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
1da177e4 LT |
5099 | |
5100 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5101 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
5102 | ||
b01a2407 | 5103 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
1da177e4 LT |
5104 | |
5105 | /* Even if we can't send the ABORT due to low memory delete the | |
5106 | * TCB. This is a departure from our typical NOMEM handling. | |
5107 | */ | |
5108 | ||
8de8c873 SS |
5109 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5110 | SCTP_ERROR(ECONNREFUSED)); | |
1da177e4 LT |
5111 | /* Delete the established association. */ |
5112 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, | |
dc251b2b | 5113 | SCTP_PERR(SCTP_ERROR_USER_ABORT)); |
1da177e4 | 5114 | |
649621e3 | 5115 | return SCTP_DISPOSITION_ABORT; |
1da177e4 LT |
5116 | } |
5117 | ||
5118 | /* | |
5119 | * sctp_sf_cookie_echoed_prm_abort | |
5120 | * | |
5121 | * Section: 4 Note: 3 | |
5122 | * Verification Tag: | |
5123 | * Inputs | |
5124 | * (endpoint, asoc) | |
5125 | * | |
5126 | * The RFC does not explcitly address this issue, but is the route through the | |
5127 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5128 | * | |
5129 | * Outputs | |
5130 | * (timers) | |
5131 | */ | |
172a1599 XL |
5132 | enum sctp_disposition sctp_sf_cookie_echoed_prm_abort( |
5133 | struct net *net, | |
5134 | const struct sctp_endpoint *ep, | |
5135 | const struct sctp_association *asoc, | |
5136 | const union sctp_subtype type, | |
5137 | void *arg, | |
5138 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5139 | { |
5140 | /* There is a single T1 timer, so we should be able to use | |
5141 | * common function with the COOKIE-WAIT state. | |
5142 | */ | |
24cb81a6 | 5143 | return sctp_sf_cookie_wait_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5144 | } |
5145 | ||
5146 | /* | |
5147 | * sctp_sf_shutdown_pending_prm_abort | |
5148 | * | |
5149 | * Inputs | |
5150 | * (endpoint, asoc) | |
5151 | * | |
5152 | * The RFC does not explicitly address this issue, but is the route through the | |
5153 | * state table when someone issues an abort while in SHUTDOWN-PENDING state. | |
5154 | * | |
5155 | * Outputs | |
5156 | * (timers) | |
5157 | */ | |
172a1599 XL |
5158 | enum sctp_disposition sctp_sf_shutdown_pending_prm_abort( |
5159 | struct net *net, | |
5160 | const struct sctp_endpoint *ep, | |
5161 | const struct sctp_association *asoc, | |
5162 | const union sctp_subtype type, | |
5163 | void *arg, | |
5164 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5165 | { |
5166 | /* Stop the T5-shutdown guard timer. */ | |
5167 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5168 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5169 | ||
24cb81a6 | 5170 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5171 | } |
5172 | ||
5173 | /* | |
5174 | * sctp_sf_shutdown_sent_prm_abort | |
5175 | * | |
5176 | * Inputs | |
5177 | * (endpoint, asoc) | |
5178 | * | |
5179 | * The RFC does not explicitly address this issue, but is the route through the | |
5180 | * state table when someone issues an abort while in SHUTDOWN-SENT state. | |
5181 | * | |
5182 | * Outputs | |
5183 | * (timers) | |
5184 | */ | |
172a1599 XL |
5185 | enum sctp_disposition sctp_sf_shutdown_sent_prm_abort( |
5186 | struct net *net, | |
5187 | const struct sctp_endpoint *ep, | |
5188 | const struct sctp_association *asoc, | |
5189 | const union sctp_subtype type, | |
5190 | void *arg, | |
5191 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5192 | { |
5193 | /* Stop the T2-shutdown timer. */ | |
5194 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5195 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5196 | ||
5197 | /* Stop the T5-shutdown guard timer. */ | |
5198 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5199 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5200 | ||
24cb81a6 | 5201 | return sctp_sf_do_9_1_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5202 | } |
5203 | ||
5204 | /* | |
5205 | * sctp_sf_cookie_echoed_prm_abort | |
5206 | * | |
5207 | * Inputs | |
5208 | * (endpoint, asoc) | |
5209 | * | |
5210 | * The RFC does not explcitly address this issue, but is the route through the | |
5211 | * state table when someone issues an abort while in COOKIE_ECHOED state. | |
5212 | * | |
5213 | * Outputs | |
5214 | * (timers) | |
5215 | */ | |
172a1599 XL |
5216 | enum sctp_disposition sctp_sf_shutdown_ack_sent_prm_abort( |
5217 | struct net *net, | |
5218 | const struct sctp_endpoint *ep, | |
5219 | const struct sctp_association *asoc, | |
5220 | const union sctp_subtype type, | |
5221 | void *arg, | |
5222 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5223 | { |
5224 | /* The same T2 timer, so we should be able to use | |
5225 | * common function with the SHUTDOWN-SENT state. | |
5226 | */ | |
24cb81a6 | 5227 | return sctp_sf_shutdown_sent_prm_abort(net, ep, asoc, type, arg, commands); |
1da177e4 LT |
5228 | } |
5229 | ||
5230 | /* | |
5231 | * Process the REQUESTHEARTBEAT primitive | |
5232 | * | |
5233 | * 10.1 ULP-to-SCTP | |
5234 | * J) Request Heartbeat | |
5235 | * | |
5236 | * Format: REQUESTHEARTBEAT(association id, destination transport address) | |
5237 | * | |
5238 | * -> result | |
5239 | * | |
5240 | * Instructs the local endpoint to perform a HeartBeat on the specified | |
5241 | * destination transport address of the given association. The returned | |
5242 | * result should indicate whether the transmission of the HEARTBEAT | |
5243 | * chunk to the destination address is successful. | |
5244 | * | |
5245 | * Mandatory attributes: | |
5246 | * | |
5247 | * o association id - local handle to the SCTP association | |
5248 | * | |
5249 | * o destination transport address - the transport address of the | |
5250 | * association on which a heartbeat should be issued. | |
5251 | */ | |
172a1599 | 5252 | enum sctp_disposition sctp_sf_do_prm_requestheartbeat( |
24cb81a6 | 5253 | struct net *net, |
1da177e4 LT |
5254 | const struct sctp_endpoint *ep, |
5255 | const struct sctp_association *asoc, | |
bfc6f827 | 5256 | const union sctp_subtype type, |
1da177e4 | 5257 | void *arg, |
a85bbeb2 | 5258 | struct sctp_cmd_seq *commands) |
1da177e4 | 5259 | { |
fb78525a VY |
5260 | if (SCTP_DISPOSITION_NOMEM == sctp_sf_heartbeat(ep, asoc, type, |
5261 | (struct sctp_transport *)arg, commands)) | |
5262 | return SCTP_DISPOSITION_NOMEM; | |
5263 | ||
5264 | /* | |
5265 | * RFC 2960 (bis), section 8.3 | |
5266 | * | |
5267 | * D) Request an on-demand HEARTBEAT on a specific destination | |
5268 | * transport address of a given association. | |
5269 | * | |
5270 | * The endpoint should increment the respective error counter of | |
5271 | * the destination transport address each time a HEARTBEAT is sent | |
5272 | * to that address and not acknowledged within one RTO. | |
5273 | * | |
5274 | */ | |
7e99013a | 5275 | sctp_add_cmd_sf(commands, SCTP_CMD_TRANSPORT_HB_SENT, |
fb78525a VY |
5276 | SCTP_TRANSPORT(arg)); |
5277 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5278 | } |
5279 | ||
5280 | /* | |
5281 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
5282 | * When an endpoint has an ASCONF signaled change to be sent to the | |
5283 | * remote endpoint it should do A1 to A9 | |
5284 | */ | |
172a1599 XL |
5285 | enum sctp_disposition sctp_sf_do_prm_asconf(struct net *net, |
5286 | const struct sctp_endpoint *ep, | |
5287 | const struct sctp_association *asoc, | |
5288 | const union sctp_subtype type, | |
5289 | void *arg, | |
5290 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5291 | { |
5292 | struct sctp_chunk *chunk = arg; | |
5293 | ||
5294 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5295 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5296 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5297 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5298 | return SCTP_DISPOSITION_CONSUME; | |
5299 | } | |
5300 | ||
7a090b04 | 5301 | /* RE-CONFIG Section 5.1 RECONF Chunk Procedures */ |
172a1599 XL |
5302 | enum sctp_disposition sctp_sf_do_prm_reconf(struct net *net, |
5303 | const struct sctp_endpoint *ep, | |
5304 | const struct sctp_association *asoc, | |
5305 | const union sctp_subtype type, | |
5306 | void *arg, | |
5307 | struct sctp_cmd_seq *commands) | |
7a090b04 XL |
5308 | { |
5309 | struct sctp_chunk *chunk = arg; | |
5310 | ||
5311 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(chunk)); | |
5312 | return SCTP_DISPOSITION_CONSUME; | |
5313 | } | |
5314 | ||
1da177e4 LT |
5315 | /* |
5316 | * Ignore the primitive event | |
5317 | * | |
5318 | * The return value is the disposition of the primitive. | |
5319 | */ | |
172a1599 XL |
5320 | enum sctp_disposition sctp_sf_ignore_primitive( |
5321 | struct net *net, | |
5322 | const struct sctp_endpoint *ep, | |
5323 | const struct sctp_association *asoc, | |
5324 | const union sctp_subtype type, | |
5325 | void *arg, | |
5326 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5327 | { |
bb33381d DB |
5328 | pr_debug("%s: primitive type:%d is ignored\n", __func__, |
5329 | type.primitive); | |
5330 | ||
1da177e4 LT |
5331 | return SCTP_DISPOSITION_DISCARD; |
5332 | } | |
5333 | ||
5334 | /*************************************************************************** | |
5335 | * These are the state functions for the OTHER events. | |
5336 | ***************************************************************************/ | |
5337 | ||
e1cdd553 WY |
5338 | /* |
5339 | * When the SCTP stack has no more user data to send or retransmit, this | |
5340 | * notification is given to the user. Also, at the time when a user app | |
5341 | * subscribes to this event, if there is no data to be sent or | |
5342 | * retransmit, the stack will immediately send up this notification. | |
5343 | */ | |
172a1599 XL |
5344 | enum sctp_disposition sctp_sf_do_no_pending_tsn( |
5345 | struct net *net, | |
5346 | const struct sctp_endpoint *ep, | |
5347 | const struct sctp_association *asoc, | |
5348 | const union sctp_subtype type, | |
5349 | void *arg, | |
5350 | struct sctp_cmd_seq *commands) | |
e1cdd553 WY |
5351 | { |
5352 | struct sctp_ulpevent *event; | |
5353 | ||
5354 | event = sctp_ulpevent_make_sender_dry_event(asoc, GFP_ATOMIC); | |
5355 | if (!event) | |
5356 | return SCTP_DISPOSITION_NOMEM; | |
5357 | ||
5358 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(event)); | |
5359 | ||
5360 | return SCTP_DISPOSITION_CONSUME; | |
5361 | } | |
5362 | ||
1da177e4 LT |
5363 | /* |
5364 | * Start the shutdown negotiation. | |
5365 | * | |
5366 | * From Section 9.2: | |
5367 | * Once all its outstanding data has been acknowledged, the endpoint | |
5368 | * shall send a SHUTDOWN chunk to its peer including in the Cumulative | |
5369 | * TSN Ack field the last sequential TSN it has received from the peer. | |
5370 | * It shall then start the T2-shutdown timer and enter the SHUTDOWN-SENT | |
5371 | * state. If the timer expires, the endpoint must re-send the SHUTDOWN | |
5372 | * with the updated last sequential TSN received from its peer. | |
5373 | * | |
5374 | * The return value is the disposition. | |
5375 | */ | |
172a1599 XL |
5376 | enum sctp_disposition sctp_sf_do_9_2_start_shutdown( |
5377 | struct net *net, | |
5378 | const struct sctp_endpoint *ep, | |
5379 | const struct sctp_association *asoc, | |
5380 | const union sctp_subtype type, | |
5381 | void *arg, | |
5382 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5383 | { |
5384 | struct sctp_chunk *reply; | |
5385 | ||
5386 | /* Once all its outstanding data has been acknowledged, the | |
5387 | * endpoint shall send a SHUTDOWN chunk to its peer including | |
5388 | * in the Cumulative TSN Ack field the last sequential TSN it | |
5389 | * has received from the peer. | |
5390 | */ | |
5391 | reply = sctp_make_shutdown(asoc, NULL); | |
5392 | if (!reply) | |
5393 | goto nomem; | |
5394 | ||
5395 | /* Set the transport for the SHUTDOWN chunk and the timeout for the | |
5396 | * T2-shutdown timer. | |
5397 | */ | |
5398 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5399 | ||
5400 | /* It shall then start the T2-shutdown timer */ | |
5401 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START, | |
5402 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5403 | ||
536428a9 WY |
5404 | /* RFC 4960 Section 9.2 |
5405 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5406 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5407 | */ | |
f8d96052 | 5408 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
536428a9 WY |
5409 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); |
5410 | ||
9f70f46b | 5411 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5412 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5413 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5414 | ||
5415 | /* and enter the SHUTDOWN-SENT state. */ | |
5416 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5417 | SCTP_STATE(SCTP_STATE_SHUTDOWN_SENT)); | |
5418 | ||
5419 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5420 | * | |
5421 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5422 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5423 | */ |
5424 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5425 | ||
5426 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5427 | ||
5428 | return SCTP_DISPOSITION_CONSUME; | |
5429 | ||
5430 | nomem: | |
5431 | return SCTP_DISPOSITION_NOMEM; | |
5432 | } | |
5433 | ||
5434 | /* | |
5435 | * Generate a SHUTDOWN ACK now that everything is SACK'd. | |
5436 | * | |
5437 | * From Section 9.2: | |
5438 | * | |
5439 | * If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5440 | * shall send a SHUTDOWN ACK and start a T2-shutdown timer of its own, | |
5441 | * entering the SHUTDOWN-ACK-SENT state. If the timer expires, the | |
5442 | * endpoint must re-send the SHUTDOWN ACK. | |
5443 | * | |
5444 | * The return value is the disposition. | |
5445 | */ | |
172a1599 XL |
5446 | enum sctp_disposition sctp_sf_do_9_2_shutdown_ack( |
5447 | struct net *net, | |
5448 | const struct sctp_endpoint *ep, | |
5449 | const struct sctp_association *asoc, | |
5450 | const union sctp_subtype type, | |
5451 | void *arg, | |
5452 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5453 | { |
172a1599 | 5454 | struct sctp_chunk *chunk = arg; |
1da177e4 LT |
5455 | struct sctp_chunk *reply; |
5456 | ||
5457 | /* There are 2 ways of getting here: | |
5458 | * 1) called in response to a SHUTDOWN chunk | |
5459 | * 2) called when SCTP_EVENT_NO_PENDING_TSN event is issued. | |
5460 | * | |
5461 | * For the case (2), the arg parameter is set to NULL. We need | |
5462 | * to check that we have a chunk before accessing it's fields. | |
5463 | */ | |
5464 | if (chunk) { | |
5465 | if (!sctp_vtag_verify(chunk, asoc)) | |
ac23e681 XL |
5466 | return sctp_sf_pdiscard(net, ep, asoc, type, arg, |
5467 | commands); | |
1da177e4 LT |
5468 | |
5469 | /* Make sure that the SHUTDOWN chunk has a valid length. */ | |
ac23e681 XL |
5470 | if (!sctp_chunk_length_valid( |
5471 | chunk, sizeof(struct sctp_shutdown_chunk))) | |
5472 | return sctp_sf_violation_chunklen(net, ep, asoc, type, | |
5473 | arg, commands); | |
1da177e4 LT |
5474 | } |
5475 | ||
5476 | /* If it has no more outstanding DATA chunks, the SHUTDOWN receiver | |
5477 | * shall send a SHUTDOWN ACK ... | |
5478 | */ | |
5479 | reply = sctp_make_shutdown_ack(asoc, chunk); | |
5480 | if (!reply) | |
5481 | goto nomem; | |
5482 | ||
5483 | /* Set the transport for the SHUTDOWN ACK chunk and the timeout for | |
5484 | * the T2-shutdown timer. | |
5485 | */ | |
5486 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5487 | ||
5488 | /* and start/restart a T2-shutdown timer of its own, */ | |
5489 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5490 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5491 | ||
9f70f46b | 5492 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE]) |
1da177e4 LT |
5493 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
5494 | SCTP_TO(SCTP_EVENT_TIMEOUT_AUTOCLOSE)); | |
5495 | ||
5496 | /* Enter the SHUTDOWN-ACK-SENT state. */ | |
5497 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5498 | SCTP_STATE(SCTP_STATE_SHUTDOWN_ACK_SENT)); | |
5499 | ||
5500 | /* sctp-implguide 2.10 Issues with Heartbeating and failover | |
5501 | * | |
5502 | * HEARTBEAT ... is discontinued after sending either SHUTDOWN | |
d808ad9a | 5503 | * or SHUTDOWN-ACK. |
1da177e4 LT |
5504 | */ |
5505 | sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_STOP, SCTP_NULL()); | |
5506 | ||
5507 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5508 | ||
5509 | return SCTP_DISPOSITION_CONSUME; | |
5510 | ||
5511 | nomem: | |
5512 | return SCTP_DISPOSITION_NOMEM; | |
5513 | } | |
5514 | ||
5515 | /* | |
5516 | * Ignore the event defined as other | |
5517 | * | |
5518 | * The return value is the disposition of the event. | |
5519 | */ | |
172a1599 XL |
5520 | enum sctp_disposition sctp_sf_ignore_other(struct net *net, |
5521 | const struct sctp_endpoint *ep, | |
5522 | const struct sctp_association *asoc, | |
5523 | const union sctp_subtype type, | |
5524 | void *arg, | |
5525 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5526 | { |
bb33381d DB |
5527 | pr_debug("%s: the event other type:%d is ignored\n", |
5528 | __func__, type.other); | |
5529 | ||
1da177e4 LT |
5530 | return SCTP_DISPOSITION_DISCARD; |
5531 | } | |
5532 | ||
5533 | /************************************************************ | |
5534 | * These are the state functions for handling timeout events. | |
5535 | ************************************************************/ | |
5536 | ||
5537 | /* | |
5538 | * RTX Timeout | |
5539 | * | |
5540 | * Section: 6.3.3 Handle T3-rtx Expiration | |
5541 | * | |
5542 | * Whenever the retransmission timer T3-rtx expires for a destination | |
5543 | * address, do the following: | |
5544 | * [See below] | |
5545 | * | |
5546 | * The return value is the disposition of the chunk. | |
5547 | */ | |
172a1599 XL |
5548 | enum sctp_disposition sctp_sf_do_6_3_3_rtx(struct net *net, |
5549 | const struct sctp_endpoint *ep, | |
5550 | const struct sctp_association *asoc, | |
5551 | const union sctp_subtype type, | |
5552 | void *arg, | |
5553 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5554 | { |
5555 | struct sctp_transport *transport = arg; | |
5556 | ||
b01a2407 | 5557 | SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); |
ac0b0462 | 5558 | |
1da177e4 | 5559 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8a0d19c5 | 5560 | if (asoc->peer.zero_window_announced && |
5561 | asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { | |
f8d96052 TG |
5562 | /* |
5563 | * We are here likely because the receiver had its rwnd | |
5564 | * closed for a while and we have not been able to | |
5565 | * transmit the locally queued data within the maximum | |
5566 | * retransmission attempts limit. Start the T5 | |
5567 | * shutdown guard timer to give the receiver one last | |
5568 | * chance and some additional time to recover before | |
5569 | * aborting. | |
5570 | */ | |
5571 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_START_ONCE, | |
5572 | SCTP_TO(SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD)); | |
5573 | } else { | |
5574 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, | |
5575 | SCTP_ERROR(ETIMEDOUT)); | |
5576 | /* CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ | |
5577 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5578 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); | |
b01a2407 EB |
5579 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5580 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
f8d96052 TG |
5581 | return SCTP_DISPOSITION_DELETE_TCB; |
5582 | } | |
1da177e4 LT |
5583 | } |
5584 | ||
5585 | /* E1) For the destination address for which the timer | |
5586 | * expires, adjust its ssthresh with rules defined in Section | |
5587 | * 7.2.3 and set the cwnd <- MTU. | |
5588 | */ | |
5589 | ||
5590 | /* E2) For the destination address for which the timer | |
5591 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
5592 | * maximum value discussed in rule C7 above (RTO.max) may be | |
5593 | * used to provide an upper bound to this doubling operation. | |
5594 | */ | |
5595 | ||
5596 | /* E3) Determine how many of the earliest (i.e., lowest TSN) | |
5597 | * outstanding DATA chunks for the address for which the | |
5598 | * T3-rtx has expired will fit into a single packet, subject | |
5599 | * to the MTU constraint for the path corresponding to the | |
5600 | * destination transport address to which the retransmission | |
5601 | * is being sent (this may be different from the address for | |
5602 | * which the timer expires [see Section 6.4]). Call this | |
5603 | * value K. Bundle and retransmit those K DATA chunks in a | |
5604 | * single packet to the destination endpoint. | |
5605 | * | |
5606 | * Note: Any DATA chunks that were sent to the address for | |
5607 | * which the T3-rtx timer expired but did not fit in one MTU | |
5608 | * (rule E3 above), should be marked for retransmission and | |
5609 | * sent as soon as cwnd allows (normally when a SACK arrives). | |
5610 | */ | |
5611 | ||
1da177e4 LT |
5612 | /* Do some failure management (Section 8.2). */ |
5613 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); | |
5614 | ||
1845a579 VY |
5615 | /* NB: Rules E4 and F1 are implicit in R1. */ |
5616 | sctp_add_cmd_sf(commands, SCTP_CMD_RETRAN, SCTP_TRANSPORT(transport)); | |
5617 | ||
1da177e4 LT |
5618 | return SCTP_DISPOSITION_CONSUME; |
5619 | } | |
5620 | ||
5621 | /* | |
5622 | * Generate delayed SACK on timeout | |
5623 | * | |
5624 | * Section: 6.2 Acknowledgement on Reception of DATA Chunks | |
5625 | * | |
5626 | * The guidelines on delayed acknowledgement algorithm specified in | |
5627 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, an | |
5628 | * acknowledgement SHOULD be generated for at least every second packet | |
5629 | * (not every second DATA chunk) received, and SHOULD be generated | |
5630 | * within 200 ms of the arrival of any unacknowledged DATA chunk. In | |
5631 | * some situations it may be beneficial for an SCTP transmitter to be | |
5632 | * more conservative than the algorithms detailed in this document | |
5633 | * allow. However, an SCTP transmitter MUST NOT be more aggressive than | |
5634 | * the following algorithms allow. | |
5635 | */ | |
172a1599 XL |
5636 | enum sctp_disposition sctp_sf_do_6_2_sack(struct net *net, |
5637 | const struct sctp_endpoint *ep, | |
5638 | const struct sctp_association *asoc, | |
5639 | const union sctp_subtype type, | |
5640 | void *arg, | |
5641 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5642 | { |
b01a2407 | 5643 | SCTP_INC_STATS(net, SCTP_MIB_DELAY_SACK_EXPIREDS); |
1da177e4 LT |
5644 | sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE()); |
5645 | return SCTP_DISPOSITION_CONSUME; | |
5646 | } | |
5647 | ||
5648 | /* | |
3f7a87d2 | 5649 | * sctp_sf_t1_init_timer_expire |
1da177e4 LT |
5650 | * |
5651 | * Section: 4 Note: 2 | |
5652 | * Verification Tag: | |
5653 | * Inputs | |
5654 | * (endpoint, asoc) | |
5655 | * | |
5656 | * RFC 2960 Section 4 Notes | |
5657 | * 2) If the T1-init timer expires, the endpoint MUST retransmit INIT | |
5658 | * and re-start the T1-init timer without changing state. This MUST | |
5659 | * be repeated up to 'Max.Init.Retransmits' times. After that, the | |
5660 | * endpoint MUST abort the initialization process and report the | |
5661 | * error to SCTP user. | |
5662 | * | |
3f7a87d2 FF |
5663 | * Outputs |
5664 | * (timers, events) | |
5665 | * | |
5666 | */ | |
172a1599 XL |
5667 | enum sctp_disposition sctp_sf_t1_init_timer_expire( |
5668 | struct net *net, | |
5669 | const struct sctp_endpoint *ep, | |
5670 | const struct sctp_association *asoc, | |
5671 | const union sctp_subtype type, | |
5672 | void *arg, | |
5673 | struct sctp_cmd_seq *commands) | |
3f7a87d2 | 5674 | { |
172a1599 | 5675 | int attempts = asoc->init_err_counter + 1; |
3f7a87d2 FF |
5676 | struct sctp_chunk *repl = NULL; |
5677 | struct sctp_bind_addr *bp; | |
3f7a87d2 | 5678 | |
bb33381d DB |
5679 | pr_debug("%s: timer T1 expired (INIT)\n", __func__); |
5680 | ||
b01a2407 | 5681 | SCTP_INC_STATS(net, SCTP_MIB_T1_INIT_EXPIREDS); |
3f7a87d2 | 5682 | |
81845c21 | 5683 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 FF |
5684 | bp = (struct sctp_bind_addr *) &asoc->base.bind_addr; |
5685 | repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0); | |
5686 | if (!repl) | |
5687 | return SCTP_DISPOSITION_NOMEM; | |
5688 | ||
5689 | /* Choose transport for INIT. */ | |
5690 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, | |
5691 | SCTP_CHUNK(repl)); | |
5692 | ||
5693 | /* Issue a sideeffect to do the needed accounting. */ | |
5694 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART, | |
5695 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
5696 | ||
5697 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); | |
5698 | } else { | |
bb33381d DB |
5699 | pr_debug("%s: giving up on INIT, attempts:%d " |
5700 | "max_init_attempts:%d\n", __func__, attempts, | |
5701 | asoc->max_init_attempts); | |
5702 | ||
8de8c873 SS |
5703 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5704 | SCTP_ERROR(ETIMEDOUT)); | |
3f7a87d2 | 5705 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5706 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
3f7a87d2 FF |
5707 | return SCTP_DISPOSITION_DELETE_TCB; |
5708 | } | |
5709 | ||
5710 | return SCTP_DISPOSITION_CONSUME; | |
5711 | } | |
5712 | ||
5713 | /* | |
5714 | * sctp_sf_t1_cookie_timer_expire | |
5715 | * | |
5716 | * Section: 4 Note: 2 | |
5717 | * Verification Tag: | |
5718 | * Inputs | |
5719 | * (endpoint, asoc) | |
5720 | * | |
5721 | * RFC 2960 Section 4 Notes | |
5722 | * 3) If the T1-cookie timer expires, the endpoint MUST retransmit | |
1da177e4 LT |
5723 | * COOKIE ECHO and re-start the T1-cookie timer without changing |
5724 | * state. This MUST be repeated up to 'Max.Init.Retransmits' times. | |
5725 | * After that, the endpoint MUST abort the initialization process and | |
5726 | * report the error to SCTP user. | |
5727 | * | |
5728 | * Outputs | |
5729 | * (timers, events) | |
5730 | * | |
5731 | */ | |
172a1599 XL |
5732 | enum sctp_disposition sctp_sf_t1_cookie_timer_expire( |
5733 | struct net *net, | |
5734 | const struct sctp_endpoint *ep, | |
5735 | const struct sctp_association *asoc, | |
5736 | const union sctp_subtype type, | |
5737 | void *arg, | |
5738 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5739 | { |
3f7a87d2 | 5740 | int attempts = asoc->init_err_counter + 1; |
172a1599 | 5741 | struct sctp_chunk *repl = NULL; |
1da177e4 | 5742 | |
bb33381d DB |
5743 | pr_debug("%s: timer T1 expired (COOKIE-ECHO)\n", __func__); |
5744 | ||
b01a2407 | 5745 | SCTP_INC_STATS(net, SCTP_MIB_T1_COOKIE_EXPIREDS); |
1da177e4 | 5746 | |
81845c21 | 5747 | if (attempts <= asoc->max_init_attempts) { |
3f7a87d2 | 5748 | repl = sctp_make_cookie_echo(asoc, NULL); |
1da177e4 | 5749 | if (!repl) |
3f7a87d2 | 5750 | return SCTP_DISPOSITION_NOMEM; |
1da177e4 | 5751 | |
96cd0d3d VY |
5752 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT, |
5753 | SCTP_CHUNK(repl)); | |
1da177e4 | 5754 | /* Issue a sideeffect to do the needed accounting. */ |
3f7a87d2 FF |
5755 | sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART, |
5756 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); | |
5757 | ||
1da177e4 LT |
5758 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl)); |
5759 | } else { | |
8de8c873 SS |
5760 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5761 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5762 | sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED, |
dc251b2b | 5763 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 LT |
5764 | return SCTP_DISPOSITION_DELETE_TCB; |
5765 | } | |
5766 | ||
5767 | return SCTP_DISPOSITION_CONSUME; | |
1da177e4 LT |
5768 | } |
5769 | ||
5770 | /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN | |
5771 | * with the updated last sequential TSN received from its peer. | |
5772 | * | |
5773 | * An endpoint should limit the number of retransmissions of the | |
5774 | * SHUTDOWN chunk to the protocol parameter 'Association.Max.Retrans'. | |
5775 | * If this threshold is exceeded the endpoint should destroy the TCB and | |
5776 | * MUST report the peer endpoint unreachable to the upper layer (and | |
5777 | * thus the association enters the CLOSED state). The reception of any | |
5778 | * packet from its peer (i.e. as the peer sends all of its queued DATA | |
5779 | * chunks) should clear the endpoint's retransmission count and restart | |
5780 | * the T2-Shutdown timer, giving its peer ample opportunity to transmit | |
5781 | * all of its queued DATA chunks that have not yet been sent. | |
5782 | */ | |
172a1599 XL |
5783 | enum sctp_disposition sctp_sf_t2_timer_expire( |
5784 | struct net *net, | |
5785 | const struct sctp_endpoint *ep, | |
5786 | const struct sctp_association *asoc, | |
5787 | const union sctp_subtype type, | |
5788 | void *arg, | |
5789 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5790 | { |
5791 | struct sctp_chunk *reply = NULL; | |
5792 | ||
bb33381d DB |
5793 | pr_debug("%s: timer T2 expired\n", __func__); |
5794 | ||
b01a2407 | 5795 | SCTP_INC_STATS(net, SCTP_MIB_T2_SHUTDOWN_EXPIREDS); |
ac0b0462 | 5796 | |
58fbbed4 NH |
5797 | ((struct sctp_association *)asoc)->shutdown_retries++; |
5798 | ||
1da177e4 | 5799 | if (asoc->overall_error_count >= asoc->max_retrans) { |
8de8c873 SS |
5800 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5801 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 LT |
5802 | /* Note: CMD_ASSOC_FAILED calls CMD_DELETE_TCB. */ |
5803 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, | |
5be291fe | 5804 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5805 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5806 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5807 | return SCTP_DISPOSITION_DELETE_TCB; |
5808 | } | |
5809 | ||
5810 | switch (asoc->state) { | |
5811 | case SCTP_STATE_SHUTDOWN_SENT: | |
5812 | reply = sctp_make_shutdown(asoc, NULL); | |
5813 | break; | |
5814 | ||
5815 | case SCTP_STATE_SHUTDOWN_ACK_SENT: | |
5816 | reply = sctp_make_shutdown_ack(asoc, NULL); | |
5817 | break; | |
5818 | ||
5819 | default: | |
5820 | BUG(); | |
5821 | break; | |
3ff50b79 | 5822 | } |
1da177e4 LT |
5823 | |
5824 | if (!reply) | |
5825 | goto nomem; | |
5826 | ||
6345b199 WY |
5827 | /* Do some failure management (Section 8.2). |
5828 | * If we remove the transport an SHUTDOWN was last sent to, don't | |
5829 | * do failure management. | |
5830 | */ | |
5831 | if (asoc->shutdown_last_sent_to) | |
5832 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5833 | SCTP_TRANSPORT(asoc->shutdown_last_sent_to)); | |
1da177e4 LT |
5834 | |
5835 | /* Set the transport for the SHUTDOWN/ACK chunk and the timeout for | |
5836 | * the T2-shutdown timer. | |
5837 | */ | |
5838 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T2, SCTP_CHUNK(reply)); | |
5839 | ||
5840 | /* Restart the T2-shutdown timer. */ | |
5841 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5842 | SCTP_TO(SCTP_EVENT_TIMEOUT_T2_SHUTDOWN)); | |
5843 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
5844 | return SCTP_DISPOSITION_CONSUME; | |
5845 | ||
5846 | nomem: | |
5847 | return SCTP_DISPOSITION_NOMEM; | |
5848 | } | |
5849 | ||
5850 | /* | |
5851 | * ADDIP Section 4.1 ASCONF CHunk Procedures | |
5852 | * If the T4 RTO timer expires the endpoint should do B1 to B5 | |
5853 | */ | |
172a1599 XL |
5854 | enum sctp_disposition sctp_sf_t4_timer_expire( |
5855 | struct net *net, | |
5856 | const struct sctp_endpoint *ep, | |
5857 | const struct sctp_association *asoc, | |
5858 | const union sctp_subtype type, | |
5859 | void *arg, | |
5860 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5861 | { |
5862 | struct sctp_chunk *chunk = asoc->addip_last_asconf; | |
5863 | struct sctp_transport *transport = chunk->transport; | |
5864 | ||
b01a2407 | 5865 | SCTP_INC_STATS(net, SCTP_MIB_T4_RTO_EXPIREDS); |
ac0b0462 | 5866 | |
1da177e4 LT |
5867 | /* ADDIP 4.1 B1) Increment the error counters and perform path failure |
5868 | * detection on the appropriate destination address as defined in | |
5869 | * RFC2960 [5] section 8.1 and 8.2. | |
5870 | */ | |
10a43cea WY |
5871 | if (transport) |
5872 | sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, | |
5873 | SCTP_TRANSPORT(transport)); | |
1da177e4 LT |
5874 | |
5875 | /* Reconfig T4 timer and transport. */ | |
5876 | sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); | |
5877 | ||
5878 | /* ADDIP 4.1 B2) Increment the association error counters and perform | |
5879 | * endpoint failure detection on the association as defined in | |
5880 | * RFC2960 [5] section 8.1 and 8.2. | |
5881 | * association error counter is incremented in SCTP_CMD_STRIKE. | |
5882 | */ | |
5883 | if (asoc->overall_error_count >= asoc->max_retrans) { | |
5884 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
5885 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
8de8c873 SS |
5886 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5887 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5888 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5889 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
b01a2407 EB |
5890 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5891 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
5892 | return SCTP_DISPOSITION_ABORT; |
5893 | } | |
5894 | ||
5895 | /* ADDIP 4.1 B3) Back-off the destination address RTO value to which | |
5896 | * the ASCONF chunk was sent by doubling the RTO timer value. | |
5897 | * This is done in SCTP_CMD_STRIKE. | |
5898 | */ | |
5899 | ||
5900 | /* ADDIP 4.1 B4) Re-transmit the ASCONF Chunk last sent and if possible | |
5901 | * choose an alternate destination address (please refer to RFC2960 | |
5902 | * [5] section 6.4.1). An endpoint MUST NOT add new parameters to this | |
d808ad9a | 5903 | * chunk, it MUST be the same (including its serial number) as the last |
1da177e4 LT |
5904 | * ASCONF sent. |
5905 | */ | |
5906 | sctp_chunk_hold(asoc->addip_last_asconf); | |
5907 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
5908 | SCTP_CHUNK(asoc->addip_last_asconf)); | |
5909 | ||
5910 | /* ADDIP 4.1 B5) Restart the T-4 RTO timer. Note that if a different | |
5911 | * destination is selected, then the RTO used will be that of the new | |
5912 | * destination address. | |
5913 | */ | |
5914 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
5915 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); | |
5916 | ||
5917 | return SCTP_DISPOSITION_CONSUME; | |
5918 | } | |
5919 | ||
5920 | /* sctpimpguide-05 Section 2.12.2 | |
5921 | * The sender of the SHUTDOWN MAY also start an overall guard timer | |
5922 | * 'T5-shutdown-guard' to bound the overall time for shutdown sequence. | |
5923 | * At the expiration of this timer the sender SHOULD abort the association | |
5924 | * by sending an ABORT chunk. | |
5925 | */ | |
172a1599 XL |
5926 | enum sctp_disposition sctp_sf_t5_timer_expire( |
5927 | struct net *net, | |
5928 | const struct sctp_endpoint *ep, | |
5929 | const struct sctp_association *asoc, | |
5930 | const union sctp_subtype type, | |
5931 | void *arg, | |
5932 | struct sctp_cmd_seq *commands) | |
1da177e4 LT |
5933 | { |
5934 | struct sctp_chunk *reply = NULL; | |
5935 | ||
bb33381d DB |
5936 | pr_debug("%s: timer T5 expired\n", __func__); |
5937 | ||
b01a2407 | 5938 | SCTP_INC_STATS(net, SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS); |
1da177e4 LT |
5939 | |
5940 | reply = sctp_make_abort(asoc, NULL, 0); | |
5941 | if (!reply) | |
5942 | goto nomem; | |
5943 | ||
5944 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(reply)); | |
8de8c873 SS |
5945 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
5946 | SCTP_ERROR(ETIMEDOUT)); | |
1da177e4 | 5947 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 5948 | SCTP_PERR(SCTP_ERROR_NO_ERROR)); |
1da177e4 | 5949 | |
b01a2407 EB |
5950 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
5951 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
a1080a8b | 5952 | |
1da177e4 LT |
5953 | return SCTP_DISPOSITION_DELETE_TCB; |
5954 | nomem: | |
5955 | return SCTP_DISPOSITION_NOMEM; | |
5956 | } | |
5957 | ||
5958 | /* Handle expiration of AUTOCLOSE timer. When the autoclose timer expires, | |
5959 | * the association is automatically closed by starting the shutdown process. | |
5960 | * The work that needs to be done is same as when SHUTDOWN is initiated by | |
5961 | * the user. So this routine looks same as sctp_sf_do_9_2_prm_shutdown(). | |
5962 | */ | |
172a1599 XL |
5963 | enum sctp_disposition sctp_sf_autoclose_timer_expire( |
5964 | struct net *net, | |
5965 | const struct sctp_endpoint *ep, | |
5966 | const struct sctp_association *asoc, | |
5967 | const union sctp_subtype type, | |
5968 | void *arg, | |
5969 | struct sctp_cmd_seq *commands) | |
1da177e4 | 5970 | { |
172a1599 | 5971 | enum sctp_disposition disposition; |
1da177e4 | 5972 | |
b01a2407 | 5973 | SCTP_INC_STATS(net, SCTP_MIB_AUTOCLOSE_EXPIREDS); |
ac0b0462 | 5974 | |
1da177e4 LT |
5975 | /* From 9.2 Shutdown of an Association |
5976 | * Upon receipt of the SHUTDOWN primitive from its upper | |
5977 | * layer, the endpoint enters SHUTDOWN-PENDING state and | |
5978 | * remains there until all outstanding data has been | |
5979 | * acknowledged by its peer. The endpoint accepts no new data | |
5980 | * from its upper layer, but retransmits data to the far end | |
5981 | * if necessary to fill gaps. | |
5982 | */ | |
5983 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
5984 | SCTP_STATE(SCTP_STATE_SHUTDOWN_PENDING)); | |
5985 | ||
1da177e4 LT |
5986 | disposition = SCTP_DISPOSITION_CONSUME; |
5987 | if (sctp_outq_is_empty(&asoc->outqueue)) { | |
24cb81a6 | 5988 | disposition = sctp_sf_do_9_2_start_shutdown(net, ep, asoc, type, |
1da177e4 LT |
5989 | arg, commands); |
5990 | } | |
172a1599 | 5991 | |
1da177e4 LT |
5992 | return disposition; |
5993 | } | |
5994 | ||
5995 | /***************************************************************************** | |
5996 | * These are sa state functions which could apply to all types of events. | |
5997 | ****************************************************************************/ | |
5998 | ||
5999 | /* | |
6000 | * This table entry is not implemented. | |
6001 | * | |
6002 | * Inputs | |
6003 | * (endpoint, asoc, chunk) | |
6004 | * | |
6005 | * The return value is the disposition of the chunk. | |
6006 | */ | |
172a1599 XL |
6007 | enum sctp_disposition sctp_sf_not_impl(struct net *net, |
6008 | const struct sctp_endpoint *ep, | |
6009 | const struct sctp_association *asoc, | |
6010 | const union sctp_subtype type, | |
6011 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6012 | { |
6013 | return SCTP_DISPOSITION_NOT_IMPL; | |
6014 | } | |
6015 | ||
6016 | /* | |
6017 | * This table entry represents a bug. | |
6018 | * | |
6019 | * Inputs | |
6020 | * (endpoint, asoc, chunk) | |
6021 | * | |
6022 | * The return value is the disposition of the chunk. | |
6023 | */ | |
172a1599 XL |
6024 | enum sctp_disposition sctp_sf_bug(struct net *net, |
6025 | const struct sctp_endpoint *ep, | |
6026 | const struct sctp_association *asoc, | |
6027 | const union sctp_subtype type, | |
6028 | void *arg, struct sctp_cmd_seq *commands) | |
1da177e4 LT |
6029 | { |
6030 | return SCTP_DISPOSITION_BUG; | |
6031 | } | |
6032 | ||
6033 | /* | |
6034 | * This table entry represents the firing of a timer in the wrong state. | |
6035 | * Since timer deletion cannot be guaranteed a timer 'may' end up firing | |
6036 | * when the association is in the wrong state. This event should | |
6037 | * be ignored, so as to prevent any rearming of the timer. | |
6038 | * | |
6039 | * Inputs | |
6040 | * (endpoint, asoc, chunk) | |
6041 | * | |
6042 | * The return value is the disposition of the chunk. | |
6043 | */ | |
172a1599 XL |
6044 | enum sctp_disposition sctp_sf_timer_ignore(struct net *net, |
6045 | const struct sctp_endpoint *ep, | |
6046 | const struct sctp_association *asoc, | |
6047 | const union sctp_subtype type, | |
6048 | void *arg, | |
6049 | struct sctp_cmd_seq *commands) | |
1da177e4 | 6050 | { |
bb33381d DB |
6051 | pr_debug("%s: timer %d ignored\n", __func__, type.chunk); |
6052 | ||
1da177e4 LT |
6053 | return SCTP_DISPOSITION_CONSUME; |
6054 | } | |
6055 | ||
6056 | /******************************************************************** | |
6057 | * 2nd Level Abstractions | |
6058 | ********************************************************************/ | |
6059 | ||
6060 | /* Pull the SACK chunk based on the SACK header. */ | |
6061 | static struct sctp_sackhdr *sctp_sm_pull_sack(struct sctp_chunk *chunk) | |
6062 | { | |
6063 | struct sctp_sackhdr *sack; | |
172a1599 | 6064 | __u16 num_dup_tsns; |
1da177e4 LT |
6065 | unsigned int len; |
6066 | __u16 num_blocks; | |
1da177e4 LT |
6067 | |
6068 | /* Protect ourselves from reading too far into | |
6069 | * the skb from a bogus sender. | |
6070 | */ | |
6071 | sack = (struct sctp_sackhdr *) chunk->skb->data; | |
6072 | ||
6073 | num_blocks = ntohs(sack->num_gap_ack_blocks); | |
6074 | num_dup_tsns = ntohs(sack->num_dup_tsns); | |
6075 | len = sizeof(struct sctp_sackhdr); | |
6076 | len += (num_blocks + num_dup_tsns) * sizeof(__u32); | |
6077 | if (len > chunk->skb->len) | |
6078 | return NULL; | |
6079 | ||
6080 | skb_pull(chunk->skb, len); | |
6081 | ||
6082 | return sack; | |
6083 | } | |
6084 | ||
6085 | /* Create an ABORT packet to be sent as a response, with the specified | |
6086 | * error causes. | |
6087 | */ | |
172a1599 XL |
6088 | static struct sctp_packet *sctp_abort_pkt_new( |
6089 | struct net *net, | |
6090 | const struct sctp_endpoint *ep, | |
6091 | const struct sctp_association *asoc, | |
6092 | struct sctp_chunk *chunk, | |
6093 | const void *payload, size_t paylen) | |
1da177e4 LT |
6094 | { |
6095 | struct sctp_packet *packet; | |
6096 | struct sctp_chunk *abort; | |
6097 | ||
2ce95503 | 6098 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6099 | |
6100 | if (packet) { | |
6101 | /* Make an ABORT. | |
6102 | * The T bit will be set if the asoc is NULL. | |
6103 | */ | |
6104 | abort = sctp_make_abort(asoc, chunk, paylen); | |
6105 | if (!abort) { | |
6106 | sctp_ootb_pkt_free(packet); | |
6107 | return NULL; | |
6108 | } | |
047a2428 JF |
6109 | |
6110 | /* Reflect vtag if T-Bit is set */ | |
6111 | if (sctp_test_T_bit(abort)) | |
6112 | packet->vtag = ntohl(chunk->sctp_hdr->vtag); | |
6113 | ||
1da177e4 LT |
6114 | /* Add specified error causes, i.e., payload, to the |
6115 | * end of the chunk. | |
6116 | */ | |
6117 | sctp_addto_chunk(abort, paylen, payload); | |
6118 | ||
6119 | /* Set the skb to the belonging sock for accounting. */ | |
6120 | abort->skb->sk = ep->base.sk; | |
6121 | ||
6122 | sctp_packet_append_chunk(packet, abort); | |
6123 | ||
6124 | } | |
6125 | ||
6126 | return packet; | |
6127 | } | |
6128 | ||
6129 | /* Allocate a packet for responding in the OOTB conditions. */ | |
172a1599 XL |
6130 | static struct sctp_packet *sctp_ootb_pkt_new( |
6131 | struct net *net, | |
6132 | const struct sctp_association *asoc, | |
6133 | const struct sctp_chunk *chunk) | |
1da177e4 | 6134 | { |
1da177e4 | 6135 | struct sctp_transport *transport; |
172a1599 XL |
6136 | struct sctp_packet *packet; |
6137 | __u16 sport, dport; | |
1da177e4 LT |
6138 | __u32 vtag; |
6139 | ||
6140 | /* Get the source and destination port from the inbound packet. */ | |
6141 | sport = ntohs(chunk->sctp_hdr->dest); | |
6142 | dport = ntohs(chunk->sctp_hdr->source); | |
6143 | ||
6144 | /* The V-tag is going to be the same as the inbound packet if no | |
6145 | * association exists, otherwise, use the peer's vtag. | |
6146 | */ | |
6147 | if (asoc) { | |
02c4e12c WY |
6148 | /* Special case the INIT-ACK as there is no peer's vtag |
6149 | * yet. | |
6150 | */ | |
cb3f837b | 6151 | switch (chunk->chunk_hdr->type) { |
02c4e12c WY |
6152 | case SCTP_CID_INIT_ACK: |
6153 | { | |
cb1844c4 | 6154 | struct sctp_initack_chunk *initack; |
02c4e12c | 6155 | |
cb1844c4 | 6156 | initack = (struct sctp_initack_chunk *)chunk->chunk_hdr; |
02c4e12c WY |
6157 | vtag = ntohl(initack->init_hdr.init_tag); |
6158 | break; | |
6159 | } | |
6160 | default: | |
6161 | vtag = asoc->peer.i.init_tag; | |
6162 | break; | |
6163 | } | |
1da177e4 LT |
6164 | } else { |
6165 | /* Special case the INIT and stale COOKIE_ECHO as there is no | |
6166 | * vtag yet. | |
6167 | */ | |
cb3f837b | 6168 | switch (chunk->chunk_hdr->type) { |
1da177e4 LT |
6169 | case SCTP_CID_INIT: |
6170 | { | |
01a992be | 6171 | struct sctp_init_chunk *init; |
1da177e4 | 6172 | |
01a992be | 6173 | init = (struct sctp_init_chunk *)chunk->chunk_hdr; |
1da177e4 LT |
6174 | vtag = ntohl(init->init_hdr.init_tag); |
6175 | break; | |
6176 | } | |
d808ad9a | 6177 | default: |
1da177e4 LT |
6178 | vtag = ntohl(chunk->sctp_hdr->vtag); |
6179 | break; | |
6180 | } | |
6181 | } | |
6182 | ||
6183 | /* Make a transport for the bucket, Eliza... */ | |
89bf3450 | 6184 | transport = sctp_transport_new(net, sctp_source(chunk), GFP_ATOMIC); |
1da177e4 LT |
6185 | if (!transport) |
6186 | goto nomem; | |
6187 | ||
6188 | /* Cache a route for the transport with the chunk's destination as | |
6189 | * the source address. | |
6190 | */ | |
16b0a030 | 6191 | sctp_transport_route(transport, (union sctp_addr *)&chunk->dest, |
2ce95503 | 6192 | sctp_sk(net->sctp.ctl_sock)); |
1da177e4 | 6193 | |
66b91d2c MRL |
6194 | packet = &transport->packet; |
6195 | sctp_packet_init(packet, transport, sport, dport); | |
6196 | sctp_packet_config(packet, vtag, 0); | |
1da177e4 LT |
6197 | |
6198 | return packet; | |
6199 | ||
6200 | nomem: | |
6201 | return NULL; | |
6202 | } | |
6203 | ||
6204 | /* Free the packet allocated earlier for responding in the OOTB condition. */ | |
6205 | void sctp_ootb_pkt_free(struct sctp_packet *packet) | |
6206 | { | |
6207 | sctp_transport_free(packet->transport); | |
6208 | } | |
6209 | ||
6210 | /* Send a stale cookie error when a invalid COOKIE ECHO chunk is found */ | |
24cb81a6 EB |
6211 | static void sctp_send_stale_cookie_err(struct net *net, |
6212 | const struct sctp_endpoint *ep, | |
1da177e4 LT |
6213 | const struct sctp_association *asoc, |
6214 | const struct sctp_chunk *chunk, | |
a85bbeb2 | 6215 | struct sctp_cmd_seq *commands, |
1da177e4 LT |
6216 | struct sctp_chunk *err_chunk) |
6217 | { | |
6218 | struct sctp_packet *packet; | |
6219 | ||
6220 | if (err_chunk) { | |
2ce95503 | 6221 | packet = sctp_ootb_pkt_new(net, asoc, chunk); |
1da177e4 LT |
6222 | if (packet) { |
6223 | struct sctp_signed_cookie *cookie; | |
6224 | ||
6225 | /* Override the OOTB vtag from the cookie. */ | |
6226 | cookie = chunk->subh.cookie_hdr; | |
6227 | packet->vtag = cookie->c.peer_vtag; | |
d808ad9a | 6228 | |
1da177e4 LT |
6229 | /* Set the skb to the belonging sock for accounting. */ |
6230 | err_chunk->skb->sk = ep->base.sk; | |
6231 | sctp_packet_append_chunk(packet, err_chunk); | |
6232 | sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT, | |
6233 | SCTP_PACKET(packet)); | |
b01a2407 | 6234 | SCTP_INC_STATS(net, SCTP_MIB_OUTCTRLCHUNKS); |
1da177e4 LT |
6235 | } else |
6236 | sctp_chunk_free (err_chunk); | |
6237 | } | |
6238 | } | |
6239 | ||
6240 | ||
6241 | /* Process a data chunk */ | |
6242 | static int sctp_eat_data(const struct sctp_association *asoc, | |
6243 | struct sctp_chunk *chunk, | |
a85bbeb2 | 6244 | struct sctp_cmd_seq *commands) |
1da177e4 | 6245 | { |
7c3ceb4f | 6246 | struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map; |
049b3ff5 | 6247 | struct sock *sk = asoc->base.sk; |
24cb81a6 | 6248 | struct net *net = sock_net(sk); |
172a1599 XL |
6249 | struct sctp_datahdr *data_hdr; |
6250 | struct sctp_chunk *err; | |
6251 | enum sctp_verb deliver; | |
6252 | size_t datalen; | |
f1751c57 | 6253 | u8 ordered = 0; |
172a1599 XL |
6254 | u16 ssn, sid; |
6255 | __u32 tsn; | |
6256 | int tmp; | |
1da177e4 | 6257 | |
3583df1a XL |
6258 | data_hdr = (struct sctp_datahdr *)chunk->skb->data; |
6259 | chunk->subh.data_hdr = data_hdr; | |
6260 | skb_pull(chunk->skb, sizeof(*data_hdr)); | |
1da177e4 LT |
6261 | |
6262 | tsn = ntohl(data_hdr->tsn); | |
bb33381d | 6263 | pr_debug("%s: TSN 0x%x\n", __func__, tsn); |
1da177e4 LT |
6264 | |
6265 | /* ASSERT: Now skb->data is really the user data. */ | |
6266 | ||
6267 | /* Process ECN based congestion. | |
6268 | * | |
6269 | * Since the chunk structure is reused for all chunks within | |
6270 | * a packet, we use ecn_ce_done to track if we've already | |
6271 | * done CE processing for this packet. | |
6272 | * | |
6273 | * We need to do ECN processing even if we plan to discard the | |
6274 | * chunk later. | |
6275 | */ | |
6276 | ||
2d47fd12 | 6277 | if (asoc->peer.ecn_capable && !chunk->ecn_ce_done) { |
e7487c86 | 6278 | struct sctp_af *af = SCTP_INPUT_CB(chunk->skb)->af; |
1da177e4 LT |
6279 | chunk->ecn_ce_done = 1; |
6280 | ||
2d47fd12 | 6281 | if (af->is_ce(sctp_gso_headskb(chunk->skb))) { |
1da177e4 LT |
6282 | /* Do real work as sideffect. */ |
6283 | sctp_add_cmd_sf(commands, SCTP_CMD_ECN_CE, | |
6284 | SCTP_U32(tsn)); | |
6285 | } | |
6286 | } | |
6287 | ||
6288 | tmp = sctp_tsnmap_check(&asoc->peer.tsn_map, tsn); | |
6289 | if (tmp < 0) { | |
6290 | /* The TSN is too high--silently discard the chunk and | |
6291 | * count on it getting retransmitted later. | |
6292 | */ | |
196d6759 MB |
6293 | if (chunk->asoc) |
6294 | chunk->asoc->stats.outofseqtsns++; | |
1da177e4 LT |
6295 | return SCTP_IERROR_HIGH_TSN; |
6296 | } else if (tmp > 0) { | |
6297 | /* This is a duplicate. Record it. */ | |
6298 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_DUP, SCTP_U32(tsn)); | |
6299 | return SCTP_IERROR_DUP_TSN; | |
6300 | } | |
6301 | ||
6302 | /* This is a new TSN. */ | |
6303 | ||
6304 | /* Discard if there is no room in the receive window. | |
6305 | * Actually, allow a little bit of overflow (up to a MTU). | |
6306 | */ | |
6307 | datalen = ntohs(chunk->chunk_hdr->length); | |
9f8d3147 | 6308 | datalen -= sizeof(struct sctp_data_chunk); |
1da177e4 LT |
6309 | |
6310 | deliver = SCTP_CMD_CHUNK_ULP; | |
6311 | ||
6312 | /* Think about partial delivery. */ | |
6313 | if ((datalen >= asoc->rwnd) && (!asoc->ulpq.pd_mode)) { | |
6314 | ||
6315 | /* Even if we don't accept this chunk there is | |
6316 | * memory pressure. | |
6317 | */ | |
6318 | sctp_add_cmd_sf(commands, SCTP_CMD_PART_DELIVER, SCTP_NULL()); | |
6319 | } | |
6320 | ||
d808ad9a | 6321 | /* Spill over rwnd a little bit. Note: While allowed, this spill over |
1da177e4 LT |
6322 | * seems a bit troublesome in that frag_point varies based on |
6323 | * PMTU. In cases, such as loopback, this might be a rather | |
6324 | * large spill over. | |
4d93df0a | 6325 | */ |
362d5204 | 6326 | if ((!chunk->data_accepted) && (!asoc->rwnd || asoc->rwnd_over || |
4d93df0a | 6327 | (datalen > asoc->rwnd + asoc->frag_point))) { |
1da177e4 LT |
6328 | |
6329 | /* If this is the next TSN, consider reneging to make | |
6330 | * room. Note: Playing nice with a confused sender. A | |
6331 | * malicious sender can still eat up all our buffer | |
6332 | * space and in the future we may want to detect and | |
6333 | * do more drastic reneging. | |
6334 | */ | |
7c3ceb4f NH |
6335 | if (sctp_tsnmap_has_gap(map) && |
6336 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { | |
bb33381d | 6337 | pr_debug("%s: reneging for tsn:%u\n", __func__, tsn); |
1da177e4 LT |
6338 | deliver = SCTP_CMD_RENEGE; |
6339 | } else { | |
bb33381d DB |
6340 | pr_debug("%s: discard tsn:%u len:%zu, rwnd:%d\n", |
6341 | __func__, tsn, datalen, asoc->rwnd); | |
6342 | ||
1da177e4 LT |
6343 | return SCTP_IERROR_IGNORE_TSN; |
6344 | } | |
6345 | } | |
6346 | ||
4d93df0a NH |
6347 | /* |
6348 | * Also try to renege to limit our memory usage in the event that | |
6349 | * we are under memory pressure | |
3ab224be | 6350 | * If we can't renege, don't worry about it, the sk_rmem_schedule |
4d93df0a NH |
6351 | * in sctp_ulpevent_make_rcvmsg will drop the frame if we grow our |
6352 | * memory usage too much | |
6353 | */ | |
6354 | if (*sk->sk_prot_creator->memory_pressure) { | |
6355 | if (sctp_tsnmap_has_gap(map) && | |
f7010e61 | 6356 | (sctp_tsnmap_get_ctsn(map) + 1) == tsn) { |
bb33381d DB |
6357 | pr_debug("%s: under pressure, reneging for tsn:%u\n", |
6358 | __func__, tsn); | |
4d93df0a NH |
6359 | deliver = SCTP_CMD_RENEGE; |
6360 | } | |
6361 | } | |
6362 | ||
1da177e4 LT |
6363 | /* |
6364 | * Section 3.3.10.9 No User Data (9) | |
6365 | * | |
6366 | * Cause of error | |
6367 | * --------------- | |
6368 | * No User Data: This error cause is returned to the originator of a | |
6369 | * DATA chunk if a received DATA chunk has no user data. | |
6370 | */ | |
6371 | if (unlikely(0 == datalen)) { | |
6372 | err = sctp_make_abort_no_data(asoc, chunk, tsn); | |
6373 | if (err) { | |
6374 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6375 | SCTP_CHUNK(err)); | |
6376 | } | |
6377 | /* We are going to ABORT, so we might as well stop | |
6378 | * processing the rest of the chunks in the packet. | |
6379 | */ | |
cb3f837b | 6380 | sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL()); |
8de8c873 SS |
6381 | sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, |
6382 | SCTP_ERROR(ECONNABORTED)); | |
1da177e4 | 6383 | sctp_add_cmd_sf(commands, SCTP_CMD_ASSOC_FAILED, |
5be291fe | 6384 | SCTP_PERR(SCTP_ERROR_NO_DATA)); |
b01a2407 EB |
6385 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); |
6386 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
1da177e4 LT |
6387 | return SCTP_IERROR_NO_DATA; |
6388 | } | |
6389 | ||
9faa730f SS |
6390 | chunk->data_accepted = 1; |
6391 | ||
1da177e4 LT |
6392 | /* Note: Some chunks may get overcounted (if we drop) or overcounted |
6393 | * if we renege and the chunk arrives again. | |
6394 | */ | |
196d6759 | 6395 | if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
b01a2407 | 6396 | SCTP_INC_STATS(net, SCTP_MIB_INUNORDERCHUNKS); |
196d6759 MB |
6397 | if (chunk->asoc) |
6398 | chunk->asoc->stats.iuodchunks++; | |
6399 | } else { | |
b01a2407 | 6400 | SCTP_INC_STATS(net, SCTP_MIB_INORDERCHUNKS); |
196d6759 MB |
6401 | if (chunk->asoc) |
6402 | chunk->asoc->stats.iodchunks++; | |
f1751c57 VY |
6403 | ordered = 1; |
6404 | } | |
1da177e4 LT |
6405 | |
6406 | /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number | |
6407 | * | |
6408 | * If an endpoint receive a DATA chunk with an invalid stream | |
6409 | * identifier, it shall acknowledge the reception of the DATA chunk | |
6410 | * following the normal procedure, immediately send an ERROR chunk | |
6411 | * with cause set to "Invalid Stream Identifier" (See Section 3.3.10) | |
6412 | * and discard the DATA chunk. | |
6413 | */ | |
f1751c57 | 6414 | sid = ntohs(data_hdr->stream); |
cee360ab | 6415 | if (sid >= asoc->stream.incnt) { |
3888e9ef VY |
6416 | /* Mark tsn as received even though we drop it */ |
6417 | sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_TSN, SCTP_U32(tsn)); | |
6418 | ||
1da177e4 LT |
6419 | err = sctp_make_op_error(asoc, chunk, SCTP_ERROR_INV_STRM, |
6420 | &data_hdr->stream, | |
6383cfb3 VY |
6421 | sizeof(data_hdr->stream), |
6422 | sizeof(u16)); | |
1da177e4 LT |
6423 | if (err) |
6424 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
6425 | SCTP_CHUNK(err)); | |
6426 | return SCTP_IERROR_BAD_STREAM; | |
6427 | } | |
6428 | ||
f1751c57 VY |
6429 | /* Check to see if the SSN is possible for this TSN. |
6430 | * The biggest gap we can record is 4K wide. Since SSNs wrap | |
6431 | * at an unsigned short, there is no way that an SSN can | |
6432 | * wrap and for a valid TSN. We can simply check if the current | |
6433 | * SSN is smaller then the next expected one. If it is, it wrapped | |
6434 | * and is invalid. | |
6435 | */ | |
6436 | ssn = ntohs(data_hdr->ssn); | |
cee360ab | 6437 | if (ordered && SSN_lt(ssn, sctp_ssn_peek(&asoc->stream, in, sid))) |
f1751c57 | 6438 | return SCTP_IERROR_PROTO_VIOLATION; |
f1751c57 | 6439 | |
1da177e4 LT |
6440 | /* Send the data up to the user. Note: Schedule the |
6441 | * SCTP_CMD_CHUNK_ULP cmd before the SCTP_CMD_GEN_SACK, as the SACK | |
6442 | * chunk needs the updated rwnd. | |
6443 | */ | |
6444 | sctp_add_cmd_sf(commands, deliver, SCTP_CHUNK(chunk)); | |
6445 | ||
6446 | return SCTP_IERROR_NO_ERROR; | |
6447 | } |