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 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * | |
60c778b2 | 6 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
7 | * |
8 | * These functions work with the state functions in sctp_sm_statefuns.c | |
9 | * to implement that state operations. These functions implement the | |
10 | * steps which require modifying existing data structures. | |
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 | * Jon Grimm <jgrimm@austin.ibm.com> | |
36 | * Hui Huang <hui.huang@nokia.com> | |
37 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
38 | * Daisy Chang <daisyc@us.ibm.com> | |
39 | * Sridhar Samudrala <sri@us.ibm.com> | |
40 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
41 | */ |
42 | ||
145ce502 JP |
43 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
44 | ||
1da177e4 LT |
45 | #include <linux/skbuff.h> |
46 | #include <linux/types.h> | |
47 | #include <linux/socket.h> | |
48 | #include <linux/ip.h> | |
5a0e3ad6 | 49 | #include <linux/gfp.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | #include <net/sctp/sctp.h> | |
52 | #include <net/sctp/sm.h> | |
53 | ||
61f0eb07 | 54 | static int sctp_cmd_interpreter(enum sctp_event event_type, |
bfc6f827 | 55 | union sctp_subtype subtype, |
52106019 | 56 | enum sctp_state state, |
1da177e4 LT |
57 | struct sctp_endpoint *ep, |
58 | struct sctp_association *asoc, | |
59 | void *event_arg, | |
172a1599 | 60 | enum sctp_disposition status, |
a85bbeb2 | 61 | struct sctp_cmd_seq *commands, |
dd0fc66f | 62 | gfp_t gfp); |
bfc6f827 XL |
63 | static int sctp_side_effects(enum sctp_event event_type, |
64 | union sctp_subtype subtype, | |
52106019 | 65 | enum sctp_state state, |
1da177e4 | 66 | struct sctp_endpoint *ep, |
649621e3 | 67 | struct sctp_association **asoc, |
1da177e4 | 68 | void *event_arg, |
172a1599 | 69 | enum sctp_disposition status, |
a85bbeb2 | 70 | struct sctp_cmd_seq *commands, |
dd0fc66f | 71 | gfp_t gfp); |
1da177e4 LT |
72 | |
73 | /******************************************************************** | |
74 | * Helper functions | |
75 | ********************************************************************/ | |
76 | ||
77 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 78 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
79 | __u32 lowest_tsn) |
80 | { | |
81 | /* Save the TSN away for comparison when we receive CWR */ | |
82 | ||
83 | asoc->last_ecne_tsn = lowest_tsn; | |
84 | asoc->need_ecne = 1; | |
85 | } | |
86 | ||
87 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
88 | /* RFC 2960 Appendix A | |
89 | * | |
90 | * RFC 2481 details a specific bit for a sender to send in | |
91 | * the header of its next outbound TCP segment to indicate to | |
92 | * its peer that it has reduced its congestion window. This | |
93 | * is termed the CWR bit. For SCTP the same indication is made | |
94 | * by including the CWR chunk. This chunk contains one data | |
95 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
96 | * This element represents the lowest TSN number in the datagram | |
97 | * that was originally marked with the CE bit. | |
98 | */ | |
99 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
172a1599 XL |
100 | __u32 lowest_tsn, |
101 | struct sctp_chunk *chunk) | |
1da177e4 LT |
102 | { |
103 | struct sctp_chunk *repl; | |
104 | ||
105 | /* Our previously transmitted packet ran into some congestion | |
106 | * so we should take action by reducing cwnd and ssthresh | |
107 | * and then ACK our peer that we we've done so by | |
108 | * sending a CWR. | |
109 | */ | |
110 | ||
111 | /* First, try to determine if we want to actually lower | |
112 | * our cwnd variables. Only lower them if the ECNE looks more | |
113 | * recent than the last response. | |
114 | */ | |
115 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
116 | struct sctp_transport *transport; | |
117 | ||
118 | /* Find which transport's congestion variables | |
119 | * need to be adjusted. | |
120 | */ | |
121 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
122 | ||
123 | /* Update the congestion variables. */ | |
124 | if (transport) | |
125 | sctp_transport_lower_cwnd(transport, | |
126 | SCTP_LOWER_CWND_ECNE); | |
127 | asoc->last_cwr_tsn = lowest_tsn; | |
128 | } | |
129 | ||
130 | /* Always try to quiet the other end. In case of lost CWR, | |
131 | * resend last_cwr_tsn. | |
132 | */ | |
133 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
134 | ||
135 | /* If we run out of memory, it will look like a lost CWR. We'll | |
136 | * get back in sync eventually. | |
137 | */ | |
138 | return repl; | |
139 | } | |
140 | ||
141 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
142 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
143 | __u32 lowest_tsn) | |
144 | { | |
145 | /* Turn off ECNE getting auto-prepended to every outgoing | |
146 | * packet | |
147 | */ | |
148 | asoc->need_ecne = 0; | |
149 | } | |
150 | ||
151 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
152 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
a85bbeb2 | 153 | struct sctp_cmd_seq *commands) |
1da177e4 | 154 | { |
172a1599 | 155 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
156 | __u32 ctsn, max_tsn_seen; |
157 | struct sctp_chunk *sack; | |
158 | int error = 0; | |
159 | ||
d808ad9a | 160 | if (force || |
52ccb8e9 FF |
161 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
162 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
163 | asoc->peer.sack_needed = 1; |
164 | ||
165 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
166 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
167 | ||
168 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
169 | * | |
170 | * Ack State : This flag indicates if the next received packet | |
171 | * : is to be responded to with a SACK. ... | |
172 | * : When DATA chunks are out of order, SACK's | |
173 | * : are not delayed (see Section 6). | |
174 | * | |
175 | * [This is actually not mentioned in Section 6, but we | |
176 | * implement it here anyway. --piggy] | |
177 | */ | |
d808ad9a | 178 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
179 | asoc->peer.sack_needed = 1; |
180 | ||
181 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
182 | * | |
183 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
184 | * an acknowledgement SHOULD be generated for at least every | |
185 | * second packet (not every second DATA chunk) received, and | |
186 | * SHOULD be generated within 200 ms of the arrival of any | |
187 | * unacknowledged DATA chunk. ... | |
188 | */ | |
189 | if (!asoc->peer.sack_needed) { | |
d364d927 | 190 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
191 | |
192 | /* Set the SACK delay timeout based on the | |
193 | * SACK delay for the last transport | |
194 | * data was received from, or the default | |
195 | * for the association. | |
196 | */ | |
d364d927 WY |
197 | if (trans) { |
198 | /* We will need a SACK for the next packet. */ | |
199 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
200 | asoc->peer.sack_needed = 1; | |
201 | ||
d808ad9a | 202 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 203 | trans->sackdelay; |
d364d927 WY |
204 | } else { |
205 | /* We will need a SACK for the next packet. */ | |
206 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
207 | asoc->peer.sack_needed = 1; | |
208 | ||
d808ad9a | 209 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 210 | asoc->sackdelay; |
d364d927 | 211 | } |
52ccb8e9 FF |
212 | |
213 | /* Restart the SACK timer. */ | |
214 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
215 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 216 | } else { |
07b4d6a1 MRL |
217 | __u32 old_a_rwnd = asoc->a_rwnd; |
218 | ||
90f2f531 | 219 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 220 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
221 | if (!sack) { |
222 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 223 | goto nomem; |
07b4d6a1 | 224 | } |
1da177e4 LT |
225 | |
226 | asoc->peer.sack_needed = 0; | |
d364d927 | 227 | asoc->peer.sack_cnt = 0; |
1da177e4 | 228 | |
732ba35e | 229 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
230 | |
231 | /* Stop the SACK timer. */ | |
232 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
233 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
234 | } | |
52ccb8e9 | 235 | |
1da177e4 LT |
236 | return error; |
237 | nomem: | |
238 | error = -ENOMEM; | |
239 | return error; | |
240 | } | |
241 | ||
242 | /* When the T3-RTX timer expires, it calls this function to create the | |
243 | * relevant state machine event. | |
244 | */ | |
245 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
246 | { | |
1da177e4 LT |
247 | struct sctp_transport *transport = (struct sctp_transport *) peer; |
248 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
249 | struct sock *sk = asoc->base.sk; |
250 | struct net *net = sock_net(sk); | |
172a1599 | 251 | int error; |
1da177e4 LT |
252 | |
253 | /* Check whether a task is in the sock. */ | |
254 | ||
635682a1 KH |
255 | bh_lock_sock(sk); |
256 | if (sock_owned_by_user(sk)) { | |
bb33381d | 257 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
258 | |
259 | /* Try again later. */ | |
260 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
261 | sctp_transport_hold(transport); | |
262 | goto out_unlock; | |
263 | } | |
264 | ||
1da177e4 | 265 | /* Run through the state machine. */ |
55e26eb9 | 266 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
267 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
268 | asoc->state, | |
269 | asoc->ep, asoc, | |
270 | transport, GFP_ATOMIC); | |
271 | ||
272 | if (error) | |
635682a1 | 273 | sk->sk_err = -error; |
1da177e4 LT |
274 | |
275 | out_unlock: | |
635682a1 | 276 | bh_unlock_sock(sk); |
1da177e4 LT |
277 | sctp_transport_put(transport); |
278 | } | |
279 | ||
280 | /* This is a sa interface for producing timeout events. It works | |
281 | * for timeouts which use the association as their parameter. | |
282 | */ | |
283 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
19cd1592 | 284 | enum sctp_event_timeout timeout_type) |
1da177e4 | 285 | { |
635682a1 KH |
286 | struct sock *sk = asoc->base.sk; |
287 | struct net *net = sock_net(sk); | |
1da177e4 LT |
288 | int error = 0; |
289 | ||
635682a1 KH |
290 | bh_lock_sock(sk); |
291 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
292 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
293 | timeout_type); | |
1da177e4 LT |
294 | |
295 | /* Try again later. */ | |
296 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
297 | sctp_association_hold(asoc); | |
298 | goto out_unlock; | |
299 | } | |
300 | ||
301 | /* Is this association really dead and just waiting around for | |
302 | * the timer to let go of the reference? | |
303 | */ | |
304 | if (asoc->base.dead) | |
305 | goto out_unlock; | |
306 | ||
307 | /* Run through the state machine. */ | |
55e26eb9 | 308 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
309 | SCTP_ST_TIMEOUT(timeout_type), |
310 | asoc->state, asoc->ep, asoc, | |
311 | (void *)timeout_type, GFP_ATOMIC); | |
312 | ||
313 | if (error) | |
635682a1 | 314 | sk->sk_err = -error; |
1da177e4 LT |
315 | |
316 | out_unlock: | |
635682a1 | 317 | bh_unlock_sock(sk); |
1da177e4 LT |
318 | sctp_association_put(asoc); |
319 | } | |
320 | ||
321 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
322 | { | |
323 | struct sctp_association *asoc = (struct sctp_association *) data; | |
324 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
325 | } | |
326 | ||
327 | static void sctp_generate_t1_init_event(unsigned long data) | |
328 | { | |
329 | struct sctp_association *asoc = (struct sctp_association *) data; | |
330 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
331 | } | |
332 | ||
333 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
334 | { | |
335 | struct sctp_association *asoc = (struct sctp_association *) data; | |
336 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
337 | } | |
338 | ||
339 | static void sctp_generate_t4_rto_event(unsigned long data) | |
340 | { | |
341 | struct sctp_association *asoc = (struct sctp_association *) data; | |
342 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
343 | } | |
344 | ||
345 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
346 | { | |
d808ad9a YH |
347 | struct sctp_association *asoc = (struct sctp_association *)data; |
348 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
349 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
350 | ||
351 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
352 | ||
353 | static void sctp_generate_autoclose_event(unsigned long data) | |
354 | { | |
355 | struct sctp_association *asoc = (struct sctp_association *) data; | |
356 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
357 | } | |
358 | ||
359 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
360 | * sure that the transport is still valid. | |
361 | */ | |
362 | void sctp_generate_heartbeat_event(unsigned long data) | |
363 | { | |
1da177e4 LT |
364 | struct sctp_transport *transport = (struct sctp_transport *) data; |
365 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
366 | struct sock *sk = asoc->base.sk; |
367 | struct net *net = sock_net(sk); | |
ba6f5e33 | 368 | u32 elapsed, timeout; |
172a1599 | 369 | int error = 0; |
1da177e4 | 370 | |
635682a1 KH |
371 | bh_lock_sock(sk); |
372 | if (sock_owned_by_user(sk)) { | |
bb33381d | 373 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
374 | |
375 | /* Try again later. */ | |
376 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
377 | sctp_transport_hold(transport); | |
378 | goto out_unlock; | |
379 | } | |
380 | ||
ba6f5e33 MRL |
381 | /* Check if we should still send the heartbeat or reschedule */ |
382 | elapsed = jiffies - transport->last_time_sent; | |
383 | timeout = sctp_transport_timeout(transport); | |
384 | if (elapsed < timeout) { | |
385 | elapsed = timeout - elapsed; | |
386 | if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) | |
387 | sctp_transport_hold(transport); | |
388 | goto out_unlock; | |
389 | } | |
390 | ||
55e26eb9 | 391 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
392 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
393 | asoc->state, asoc->ep, asoc, | |
394 | transport, GFP_ATOMIC); | |
395 | ||
f05940e6 | 396 | if (error) |
635682a1 | 397 | sk->sk_err = -error; |
1da177e4 LT |
398 | |
399 | out_unlock: | |
635682a1 | 400 | bh_unlock_sock(sk); |
1da177e4 LT |
401 | sctp_transport_put(transport); |
402 | } | |
403 | ||
50b5d6ad VY |
404 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
405 | * the correct state machine transition that will close the association. | |
406 | */ | |
407 | void sctp_generate_proto_unreach_event(unsigned long data) | |
408 | { | |
172a1599 | 409 | struct sctp_transport *transport = (struct sctp_transport *)data; |
50b5d6ad | 410 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
411 | struct sock *sk = asoc->base.sk; |
412 | struct net *net = sock_net(sk); | |
cb3f837b | 413 | |
635682a1 KH |
414 | bh_lock_sock(sk); |
415 | if (sock_owned_by_user(sk)) { | |
bb33381d | 416 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
417 | |
418 | /* Try again later. */ | |
419 | if (!mod_timer(&transport->proto_unreach_timer, | |
420 | jiffies + (HZ/20))) | |
421 | sctp_association_hold(asoc); | |
422 | goto out_unlock; | |
423 | } | |
424 | ||
425 | /* Is this structure just waiting around for us to actually | |
426 | * get destroyed? | |
427 | */ | |
428 | if (asoc->base.dead) | |
429 | goto out_unlock; | |
430 | ||
55e26eb9 | 431 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
432 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
433 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
434 | ||
435 | out_unlock: | |
635682a1 | 436 | bh_unlock_sock(sk); |
50b5d6ad VY |
437 | sctp_association_put(asoc); |
438 | } | |
439 | ||
7b9438de XL |
440 | /* Handle the timeout of the RE-CONFIG timer. */ |
441 | void sctp_generate_reconf_event(unsigned long data) | |
442 | { | |
443 | struct sctp_transport *transport = (struct sctp_transport *)data; | |
444 | struct sctp_association *asoc = transport->asoc; | |
445 | struct sock *sk = asoc->base.sk; | |
446 | struct net *net = sock_net(sk); | |
447 | int error = 0; | |
448 | ||
449 | bh_lock_sock(sk); | |
450 | if (sock_owned_by_user(sk)) { | |
451 | pr_debug("%s: sock is busy\n", __func__); | |
452 | ||
453 | /* Try again later. */ | |
454 | if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20))) | |
455 | sctp_transport_hold(transport); | |
456 | goto out_unlock; | |
457 | } | |
458 | ||
459 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, | |
460 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF), | |
461 | asoc->state, asoc->ep, asoc, | |
462 | transport, GFP_ATOMIC); | |
463 | ||
464 | if (error) | |
465 | sk->sk_err = -error; | |
466 | ||
467 | out_unlock: | |
468 | bh_unlock_sock(sk); | |
469 | sctp_transport_put(transport); | |
470 | } | |
50b5d6ad | 471 | |
1da177e4 LT |
472 | /* Inject a SACK Timeout event into the state machine. */ |
473 | static void sctp_generate_sack_event(unsigned long data) | |
474 | { | |
172a1599 | 475 | struct sctp_association *asoc = (struct sctp_association *)data; |
1da177e4 LT |
476 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
477 | } | |
478 | ||
479 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
480 | NULL, | |
481 | sctp_generate_t1_cookie_event, | |
482 | sctp_generate_t1_init_event, | |
483 | sctp_generate_t2_shutdown_event, | |
484 | NULL, | |
485 | sctp_generate_t4_rto_event, | |
486 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 487 | NULL, |
7b9438de | 488 | NULL, |
1da177e4 LT |
489 | sctp_generate_sack_event, |
490 | sctp_generate_autoclose_event, | |
491 | }; | |
492 | ||
493 | ||
494 | /* RFC 2960 8.2 Path Failure Detection | |
495 | * | |
496 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
497 | * error counter for each of the destination transport addresses of the | |
498 | * peer endpoint. | |
499 | * | |
500 | * Each time the T3-rtx timer expires on any address, or when a | |
501 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
502 | * the error counter of that destination address will be incremented. | |
503 | * When the value in the error counter exceeds the protocol parameter | |
504 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
505 | * mark the destination transport address as inactive, and a | |
506 | * notification SHOULD be sent to the upper layer. | |
507 | * | |
508 | */ | |
a85bbeb2 | 509 | static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands, |
5aa93bcf | 510 | struct sctp_association *asoc, |
7e99013a VY |
511 | struct sctp_transport *transport, |
512 | int is_hb) | |
1da177e4 | 513 | { |
566178f8 ZY |
514 | struct net *net = sock_net(asoc->base.sk); |
515 | ||
1da177e4 LT |
516 | /* The check for association's overall error counter exceeding the |
517 | * threshold is done in the state function. | |
518 | */ | |
b9f84786 VY |
519 | /* We are here due to a timer expiration. If the timer was |
520 | * not a HEARTBEAT, then normal error tracking is done. | |
521 | * If the timer was a heartbeat, we only increment error counts | |
522 | * when we already have an outstanding HEARTBEAT that has not | |
523 | * been acknowledged. | |
25985edc | 524 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 525 | */ |
b9f84786 | 526 | if (!is_hb) { |
ad8fec17 | 527 | asoc->overall_error_count++; |
b9f84786 VY |
528 | if (transport->state != SCTP_INACTIVE) |
529 | transport->error_count++; | |
530 | } else if (transport->hb_sent) { | |
531 | if (transport->state != SCTP_UNCONFIRMED) | |
532 | asoc->overall_error_count++; | |
533 | if (transport->state != SCTP_INACTIVE) | |
534 | transport->error_count++; | |
535 | } | |
1da177e4 | 536 | |
5aa93bcf | 537 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 538 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
539 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
540 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 541 | */ |
566178f8 ZY |
542 | if (net->sctp.pf_enable && |
543 | (transport->state == SCTP_ACTIVE) && | |
5aa93bcf NH |
544 | (asoc->pf_retrans < transport->pathmaxrxt) && |
545 | (transport->error_count > asoc->pf_retrans)) { | |
546 | ||
547 | sctp_assoc_control_transport(asoc, transport, | |
548 | SCTP_TRANSPORT_PF, | |
549 | 0); | |
550 | ||
551 | /* Update the hb timer to resend a heartbeat every rto */ | |
ba6f5e33 | 552 | sctp_transport_reset_hb_timer(transport); |
5aa93bcf NH |
553 | } |
554 | ||
3f7a87d2 | 555 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 556 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
557 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
558 | __func__, asoc, &transport->ipaddr.sa); | |
559 | ||
1da177e4 LT |
560 | sctp_assoc_control_transport(asoc, transport, |
561 | SCTP_TRANSPORT_DOWN, | |
562 | SCTP_FAILED_THRESHOLD); | |
563 | } | |
564 | ||
565 | /* E2) For the destination address for which the timer | |
566 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
567 | * maximum value discussed in rule C7 above (RTO.max) may be | |
568 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
569 | * |
570 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 571 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 572 | * that indicates that we have an outstanding HB. |
1da177e4 | 573 | */ |
7e99013a | 574 | if (!is_hb || transport->hb_sent) { |
faee47cd | 575 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 576 | sctp_max_rto(asoc, transport); |
faee47cd | 577 | } |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Worker routine to handle INIT command failure. */ | |
a85bbeb2 | 581 | static void sctp_cmd_init_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 582 | struct sctp_association *asoc, |
95c96174 | 583 | unsigned int error) |
1da177e4 LT |
584 | { |
585 | struct sctp_ulpevent *event; | |
586 | ||
cb3f837b | 587 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 588 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
589 | GFP_ATOMIC); |
590 | ||
591 | if (event) | |
592 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
593 | SCTP_ULPEVENT(event)); | |
594 | ||
595 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
596 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
597 | ||
598 | /* SEND_FAILED sent later when cleaning up the association. */ | |
599 | asoc->outqueue.error = error; | |
600 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
601 | } | |
602 | ||
603 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
a85bbeb2 | 604 | static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 605 | struct sctp_association *asoc, |
61f0eb07 | 606 | enum sctp_event event_type, |
bfc6f827 | 607 | union sctp_subtype subtype, |
1da177e4 | 608 | struct sctp_chunk *chunk, |
95c96174 | 609 | unsigned int error) |
1da177e4 LT |
610 | { |
611 | struct sctp_ulpevent *event; | |
de4594a5 | 612 | struct sctp_chunk *abort; |
172a1599 | 613 | |
1da177e4 LT |
614 | /* Cancel any partial delivery in progress. */ |
615 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
616 | ||
a5a35e76 VY |
617 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
618 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
619 | (__u16)error, 0, 0, chunk, | |
620 | GFP_ATOMIC); | |
621 | else | |
622 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
623 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
624 | GFP_ATOMIC); |
625 | if (event) | |
626 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
627 | SCTP_ULPEVENT(event)); | |
628 | ||
de4594a5 NH |
629 | if (asoc->overall_error_count >= asoc->max_retrans) { |
630 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
631 | if (abort) | |
632 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
633 | SCTP_CHUNK(abort)); | |
634 | } | |
635 | ||
1da177e4 LT |
636 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
637 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
638 | ||
1da177e4 LT |
639 | /* SEND_FAILED sent later when cleaning up the association. */ |
640 | asoc->outqueue.error = error; | |
641 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
642 | } | |
643 | ||
644 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
645 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
646 | * since all other cases use "temporary" associations and can do all | |
647 | * their work in statefuns directly. | |
648 | */ | |
a85bbeb2 | 649 | static int sctp_cmd_process_init(struct sctp_cmd_seq *commands, |
1da177e4 LT |
650 | struct sctp_association *asoc, |
651 | struct sctp_chunk *chunk, | |
01a992be | 652 | struct sctp_init_chunk *peer_init, |
dd0fc66f | 653 | gfp_t gfp) |
1da177e4 LT |
654 | { |
655 | int error; | |
656 | ||
657 | /* We only process the init as a sideeffect in a single | |
658 | * case. This is when we process the INIT-ACK. If we | |
659 | * fail during INIT processing (due to malloc problems), | |
660 | * just return the error and stop processing the stack. | |
661 | */ | |
de6becdc | 662 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
663 | error = -ENOMEM; |
664 | else | |
665 | error = 0; | |
666 | ||
667 | return error; | |
668 | } | |
669 | ||
670 | /* Helper function to break out starting up of heartbeat timers. */ | |
a85bbeb2 | 671 | static void sctp_cmd_hb_timers_start(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
672 | struct sctp_association *asoc) |
673 | { | |
674 | struct sctp_transport *t; | |
1da177e4 LT |
675 | |
676 | /* Start a heartbeat timer for each transport on the association. | |
677 | * hold a reference on the transport to make sure none of | |
678 | * the needed data structures go away. | |
679 | */ | |
ba6f5e33 MRL |
680 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) |
681 | sctp_transport_reset_hb_timer(t); | |
1da177e4 LT |
682 | } |
683 | ||
a85bbeb2 | 684 | static void sctp_cmd_hb_timers_stop(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
685 | struct sctp_association *asoc) |
686 | { | |
687 | struct sctp_transport *t; | |
1da177e4 LT |
688 | |
689 | /* Stop all heartbeat timers. */ | |
690 | ||
9dbc15f0 RD |
691 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
692 | transports) { | |
1da177e4 LT |
693 | if (del_timer(&t->hb_timer)) |
694 | sctp_transport_put(t); | |
695 | } | |
696 | } | |
697 | ||
698 | /* Helper function to stop any pending T3-RTX timers */ | |
a85bbeb2 | 699 | static void sctp_cmd_t3_rtx_timers_stop(struct sctp_cmd_seq *cmds, |
d808ad9a | 700 | struct sctp_association *asoc) |
1da177e4 LT |
701 | { |
702 | struct sctp_transport *t; | |
1da177e4 | 703 | |
9dbc15f0 RD |
704 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
705 | transports) { | |
25cc4ae9 | 706 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 707 | sctp_transport_put(t); |
1da177e4 LT |
708 | } |
709 | } | |
710 | ||
711 | ||
1da177e4 | 712 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
a85bbeb2 | 713 | static void sctp_cmd_transport_on(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
714 | struct sctp_association *asoc, |
715 | struct sctp_transport *t, | |
716 | struct sctp_chunk *chunk) | |
717 | { | |
edf903f8 | 718 | struct sctp_sender_hb_info *hbinfo; |
34d2d89f | 719 | int was_unconfirmed = 0; |
1da177e4 LT |
720 | |
721 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
722 | * HEARTBEAT should clear the error counter of the destination | |
723 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
724 | */ |
725 | t->error_count = 0; | |
f8d96052 TG |
726 | |
727 | /* | |
728 | * Although RFC4960 specifies that the overall error count must | |
729 | * be cleared when a HEARTBEAT ACK is received, we make an | |
730 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
731 | * window shut forever, we may never be able to transmit our | |
732 | * outstanding data and rely on the retransmission limit be reached | |
733 | * to shutdown the association. | |
734 | */ | |
f648f807 | 735 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 736 | t->asoc->overall_error_count = 0; |
1da177e4 | 737 | |
faee47cd VY |
738 | /* Clear the hb_sent flag to signal that we had a good |
739 | * acknowledgement. | |
740 | */ | |
741 | t->hb_sent = 0; | |
742 | ||
1da177e4 LT |
743 | /* Mark the destination transport address as active if it is not so |
744 | * marked. | |
745 | */ | |
34d2d89f MH |
746 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
747 | was_unconfirmed = 1; | |
1da177e4 LT |
748 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
749 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 750 | } |
1da177e4 | 751 | |
5aa93bcf NH |
752 | if (t->state == SCTP_PF) |
753 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
754 | SCTP_HEARTBEAT_SUCCESS); | |
755 | ||
8c2f414a DB |
756 | /* HB-ACK was received for a the proper HB. Consider this |
757 | * forward progress. | |
758 | */ | |
759 | if (t->dst) | |
c86a773c | 760 | sctp_transport_dst_confirm(t); |
8c2f414a | 761 | |
1da177e4 LT |
762 | /* The receiver of the HEARTBEAT ACK should also perform an |
763 | * RTT measurement for that destination transport address | |
764 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
765 | * If the transport's rto_pending variable has been cleared, |
766 | * it was most likely due to a retransmit. However, we want | |
767 | * to re-enable it to properly update the rto. | |
1da177e4 | 768 | */ |
e533ca16 VY |
769 | if (t->rto_pending == 0) |
770 | t->rto_pending = 1; | |
771 | ||
edf903f8 | 772 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
1da177e4 | 773 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
ad8fec17 SS |
774 | |
775 | /* Update the heartbeat timer. */ | |
ba6f5e33 | 776 | sctp_transport_reset_hb_timer(t); |
34d2d89f MH |
777 | |
778 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
779 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
780 | } |
781 | ||
1da177e4 LT |
782 | |
783 | /* Helper function to process the process SACK command. */ | |
a85bbeb2 | 784 | static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds, |
1da177e4 | 785 | struct sctp_association *asoc, |
edfee033 | 786 | struct sctp_chunk *chunk) |
1da177e4 | 787 | { |
2e3216cd | 788 | int err = 0; |
1da177e4 | 789 | |
edfee033 | 790 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
791 | struct net *net = sock_net(asoc->base.sk); |
792 | ||
1da177e4 | 793 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 794 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
795 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
796 | asoc->state, asoc->ep, asoc, NULL, | |
797 | GFP_ATOMIC); | |
1da177e4 LT |
798 | } |
799 | ||
800 | return err; | |
801 | } | |
802 | ||
803 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
804 | * the transport for a shutdown chunk. | |
805 | */ | |
a85bbeb2 | 806 | static void sctp_cmd_setup_t2(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
807 | struct sctp_association *asoc, |
808 | struct sctp_chunk *chunk) | |
809 | { | |
810 | struct sctp_transport *t; | |
811 | ||
c17b02b3 VY |
812 | if (chunk->transport) |
813 | t = chunk->transport; | |
814 | else { | |
815 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 816 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
817 | chunk->transport = t; |
818 | } | |
1da177e4 LT |
819 | asoc->shutdown_last_sent_to = t; |
820 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
821 | } |
822 | ||
a85bbeb2 | 823 | static void sctp_cmd_assoc_update(struct sctp_cmd_seq *cmds, |
5ee8aa68 XL |
824 | struct sctp_association *asoc, |
825 | struct sctp_association *new) | |
826 | { | |
827 | struct net *net = sock_net(asoc->base.sk); | |
828 | struct sctp_chunk *abort; | |
829 | ||
830 | if (!sctp_assoc_update(asoc, new)) | |
831 | return; | |
832 | ||
d8238d9d | 833 | abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr)); |
5ee8aa68 XL |
834 | if (abort) { |
835 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
836 | sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
837 | } | |
838 | sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
839 | sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED, | |
840 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
841 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
842 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
843 | } | |
844 | ||
1da177e4 | 845 | /* Helper function to change the state of an association. */ |
a85bbeb2 | 846 | static void sctp_cmd_new_state(struct sctp_cmd_seq *cmds, |
1da177e4 | 847 | struct sctp_association *asoc, |
52106019 | 848 | enum sctp_state state) |
1da177e4 LT |
849 | { |
850 | struct sock *sk = asoc->base.sk; | |
851 | ||
852 | asoc->state = state; | |
853 | ||
bb33381d | 854 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 855 | |
1da177e4 | 856 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 857 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 858 | * successfully completed a connect() call. |
1da177e4 LT |
859 | */ |
860 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
861 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
862 | ||
863 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
864 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
d46e416c XL |
865 | sctp_sstate(sk, ESTABLISHED)) { |
866 | sk->sk_state = SCTP_SS_CLOSING; | |
1da177e4 | 867 | sk->sk_shutdown |= RCV_SHUTDOWN; |
d46e416c | 868 | } |
1da177e4 LT |
869 | } |
870 | ||
3f7a87d2 FF |
871 | if (sctp_state(asoc, COOKIE_WAIT)) { |
872 | /* Reset init timeouts since they may have been | |
873 | * increased due to timer expirations. | |
874 | */ | |
875 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 876 | asoc->rto_initial; |
3f7a87d2 | 877 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 878 | asoc->rto_initial; |
3f7a87d2 FF |
879 | } |
880 | ||
1da177e4 LT |
881 | if (sctp_state(asoc, ESTABLISHED) || |
882 | sctp_state(asoc, CLOSED) || | |
883 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
884 | /* Wake up any processes waiting in the asoc's wait queue in | |
885 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 886 | */ |
1da177e4 LT |
887 | if (waitqueue_active(&asoc->wait)) |
888 | wake_up_interruptible(&asoc->wait); | |
889 | ||
890 | /* Wake up any processes waiting in the sk's sleep queue of | |
891 | * a TCP-style or UDP-style peeled-off socket in | |
892 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
893 | * For a UDP-style socket, the waiters are woken up by the | |
894 | * notifications. | |
895 | */ | |
896 | if (!sctp_style(sk, UDP)) | |
897 | sk->sk_state_change(sk); | |
898 | } | |
b7018d0b XL |
899 | |
900 | if (sctp_state(asoc, SHUTDOWN_PENDING) && | |
901 | !sctp_outq_is_empty(&asoc->outqueue)) | |
902 | sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC); | |
1da177e4 LT |
903 | } |
904 | ||
905 | /* Helper function to delete an association. */ | |
a85bbeb2 | 906 | static void sctp_cmd_delete_tcb(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
907 | struct sctp_association *asoc) |
908 | { | |
909 | struct sock *sk = asoc->base.sk; | |
910 | ||
911 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 912 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 913 | * can pick it up later. |
d808ad9a | 914 | */ |
1da177e4 LT |
915 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
916 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
917 | return; | |
918 | ||
1da177e4 LT |
919 | sctp_association_free(asoc); |
920 | } | |
921 | ||
922 | /* | |
923 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
924 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
925 | * destination address (we use active path instead of primary path just | |
d808ad9a | 926 | * because primary path may be inactive. |
1da177e4 | 927 | */ |
a85bbeb2 XL |
928 | static void sctp_cmd_setup_t4(struct sctp_cmd_seq *cmds, |
929 | struct sctp_association *asoc, | |
930 | struct sctp_chunk *chunk) | |
1da177e4 LT |
931 | { |
932 | struct sctp_transport *t; | |
933 | ||
9919b455 | 934 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
935 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
936 | chunk->transport = t; | |
937 | } | |
938 | ||
d808ad9a | 939 | /* Process an incoming Operation Error Chunk. */ |
a85bbeb2 | 940 | static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
941 | struct sctp_association *asoc, |
942 | struct sctp_chunk *chunk) | |
943 | { | |
1da177e4 | 944 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
945 | struct sctp_ulpevent *ev; |
946 | ||
947 | while (chunk->chunk_end > chunk->skb->data) { | |
948 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
949 | ||
950 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
951 | GFP_ATOMIC); | |
952 | if (!ev) | |
953 | return; | |
954 | ||
955 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
956 | ||
957 | switch (err_hdr->cause) { | |
958 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
959 | { | |
922dbc5b | 960 | struct sctp_chunkhdr *unk_chunk_hdr; |
3df26787 | 961 | |
922dbc5b XL |
962 | unk_chunk_hdr = (struct sctp_chunkhdr *) |
963 | err_hdr->variable; | |
3df26787 WY |
964 | switch (unk_chunk_hdr->type) { |
965 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
966 | * an ERROR chunk reporting that it did not recognized | |
967 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
968 | * NOT send any further ASCONF chunks and MUST stop its | |
969 | * T-4 timer. | |
970 | */ | |
971 | case SCTP_CID_ASCONF: | |
972 | if (asoc->peer.asconf_capable == 0) | |
973 | break; | |
974 | ||
975 | asoc->peer.asconf_capable = 0; | |
976 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 977 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
978 | break; |
979 | default: | |
980 | break; | |
981 | } | |
1da177e4 | 982 | break; |
3df26787 | 983 | } |
1da177e4 LT |
984 | default: |
985 | break; | |
986 | } | |
1da177e4 LT |
987 | } |
988 | } | |
989 | ||
990 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 991 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
992 | struct sctp_chunk *chunk) |
993 | { | |
994 | struct sctp_fwdtsn_skip *skip; | |
172a1599 | 995 | |
1da177e4 LT |
996 | /* Walk through all the skipped SSNs */ |
997 | sctp_walk_fwdtsn(skip, chunk) { | |
998 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
999 | } | |
1da177e4 LT |
1000 | } |
1001 | ||
d808ad9a | 1002 | /* Helper function to remove the association non-primary peer |
1da177e4 | 1003 | * transports. |
d808ad9a | 1004 | */ |
1da177e4 LT |
1005 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
1006 | { | |
1007 | struct sctp_transport *t; | |
1da177e4 | 1008 | struct list_head *temp; |
172a1599 | 1009 | struct list_head *pos; |
1da177e4 LT |
1010 | |
1011 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1012 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 1013 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 1014 | &asoc->peer.primary_addr)) { |
73e67420 | 1015 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
1016 | } |
1017 | } | |
1da177e4 LT |
1018 | } |
1019 | ||
8de8c873 SS |
1020 | /* Helper function to set sk_err on a 1-1 style socket. */ |
1021 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
1022 | { | |
1023 | struct sock *sk = asoc->base.sk; | |
1024 | ||
1025 | if (!sctp_style(sk, UDP)) | |
1026 | sk->sk_err = error; | |
1027 | } | |
1028 | ||
07d93967 | 1029 | /* Helper function to generate an association change event */ |
a85bbeb2 XL |
1030 | static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands, |
1031 | struct sctp_association *asoc, | |
1032 | u8 state) | |
07d93967 VY |
1033 | { |
1034 | struct sctp_ulpevent *ev; | |
1035 | ||
1036 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
1037 | asoc->c.sinit_num_ostreams, | |
1038 | asoc->c.sinit_max_instreams, | |
1039 | NULL, GFP_ATOMIC); | |
1040 | if (ev) | |
1041 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1042 | } | |
1043 | ||
1044 | /* Helper function to generate an adaptation indication event */ | |
a85bbeb2 | 1045 | static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands, |
07d93967 VY |
1046 | struct sctp_association *asoc) |
1047 | { | |
1048 | struct sctp_ulpevent *ev; | |
1049 | ||
1050 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1051 | ||
1052 | if (ev) | |
1053 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1054 | } | |
1055 | ||
96cd0d3d VY |
1056 | |
1057 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
19cd1592 XL |
1058 | enum sctp_event_timeout timer, |
1059 | char *name) | |
96cd0d3d VY |
1060 | { |
1061 | struct sctp_transport *t; | |
1062 | ||
1063 | t = asoc->init_last_sent_to; | |
1064 | asoc->init_err_counter++; | |
1065 | ||
1066 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1067 | asoc->timeouts[timer] *= 2; | |
1068 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1069 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1070 | } | |
1071 | asoc->init_cycle++; | |
bb33381d DB |
1072 | |
1073 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1074 | " cycle:%d timeout:%ld\n", __func__, name, | |
1075 | asoc->init_err_counter, asoc->init_cycle, | |
1076 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1077 | } |
1078 | ||
1079 | } | |
1080 | ||
9c5c62be VY |
1081 | /* Send the whole message, chunk by chunk, to the outqueue. |
1082 | * This way the whole message is queued up and bundling if | |
1083 | * encouraged for small fragments. | |
1084 | */ | |
66388f2c XL |
1085 | static void sctp_cmd_send_msg(struct sctp_association *asoc, |
1086 | struct sctp_datamsg *msg, gfp_t gfp) | |
9c5c62be VY |
1087 | { |
1088 | struct sctp_chunk *chunk; | |
9c5c62be | 1089 | |
66388f2c XL |
1090 | list_for_each_entry(chunk, &msg->chunks, frag_list) |
1091 | sctp_outq_tail(&asoc->outqueue, chunk, gfp); | |
9c5c62be VY |
1092 | } |
1093 | ||
1094 | ||
c0786693 VY |
1095 | /* Sent the next ASCONF packet currently stored in the association. |
1096 | * This happens after the ASCONF_ACK was succeffully processed. | |
1097 | */ | |
1098 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1099 | { | |
55e26eb9 EB |
1100 | struct net *net = sock_net(asoc->base.sk); |
1101 | ||
c0786693 VY |
1102 | /* Send the next asconf chunk from the addip chunk |
1103 | * queue. | |
1104 | */ | |
1105 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1106 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1107 | struct sctp_chunk *asconf = list_entry(entry, | |
1108 | struct sctp_chunk, list); | |
1109 | list_del_init(entry); | |
1110 | ||
1111 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1112 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1113 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1114 | sctp_chunk_free(asconf); |
1115 | else | |
1116 | asoc->addip_last_asconf = asconf; | |
1117 | } | |
1118 | } | |
1119 | ||
9c5c62be | 1120 | |
1da177e4 LT |
1121 | /* These three macros allow us to pull the debugging code out of the |
1122 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1123 | * functionality there. | |
1124 | */ | |
bb33381d DB |
1125 | #define debug_pre_sfn() \ |
1126 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1127 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1128 | asoc, sctp_state_tbl[state], state_fn->name) | |
1129 | ||
1130 | #define debug_post_sfn() \ | |
1131 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1132 | sctp_status_tbl[status]) | |
1133 | ||
1134 | #define debug_post_sfx() \ | |
1135 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1136 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1137 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1138 | |
1139 | /* | |
1140 | * This is the master state machine processing function. | |
1141 | * | |
1142 | * If you want to understand all of lksctp, this is a | |
1143 | * good place to start. | |
1144 | */ | |
61f0eb07 | 1145 | int sctp_do_sm(struct net *net, enum sctp_event event_type, |
bfc6f827 | 1146 | union sctp_subtype subtype, enum sctp_state state, |
61f0eb07 XL |
1147 | struct sctp_endpoint *ep, struct sctp_association *asoc, |
1148 | void *event_arg, gfp_t gfp) | |
1da177e4 | 1149 | { |
bfc6f827 | 1150 | typedef const char *(printfn_t)(union sctp_subtype); |
1da177e4 LT |
1151 | static printfn_t *table[] = { |
1152 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1153 | }; | |
1154 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
172a1599 XL |
1155 | const struct sctp_sm_table_entry *state_fn; |
1156 | struct sctp_cmd_seq commands; | |
1157 | enum sctp_disposition status; | |
1158 | int error = 0; | |
1da177e4 LT |
1159 | |
1160 | /* Look up the state function, run it, and then process the | |
1161 | * side effects. These three steps are the heart of lksctp. | |
1162 | */ | |
55e26eb9 | 1163 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1164 | |
1165 | sctp_init_cmd_seq(&commands); | |
1166 | ||
bb33381d | 1167 | debug_pre_sfn(); |
131334d0 | 1168 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1169 | debug_post_sfn(); |
1da177e4 LT |
1170 | |
1171 | error = sctp_side_effects(event_type, subtype, state, | |
649621e3 | 1172 | ep, &asoc, event_arg, status, |
1da177e4 | 1173 | &commands, gfp); |
bb33381d | 1174 | debug_post_sfx(); |
1da177e4 LT |
1175 | |
1176 | return error; | |
1177 | } | |
1178 | ||
1da177e4 LT |
1179 | /***************************************************************** |
1180 | * This the master state function side effect processing function. | |
1181 | *****************************************************************/ | |
bfc6f827 XL |
1182 | static int sctp_side_effects(enum sctp_event event_type, |
1183 | union sctp_subtype subtype, | |
52106019 | 1184 | enum sctp_state state, |
1da177e4 | 1185 | struct sctp_endpoint *ep, |
649621e3 | 1186 | struct sctp_association **asoc, |
1da177e4 | 1187 | void *event_arg, |
172a1599 | 1188 | enum sctp_disposition status, |
a85bbeb2 | 1189 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1190 | gfp_t gfp) |
1da177e4 LT |
1191 | { |
1192 | int error; | |
1193 | ||
1194 | /* FIXME - Most of the dispositions left today would be categorized | |
1195 | * as "exceptional" dispositions. For those dispositions, it | |
1196 | * may not be proper to run through any of the commands at all. | |
1197 | * For example, the command interpreter might be run only with | |
1198 | * disposition SCTP_DISPOSITION_CONSUME. | |
1199 | */ | |
1200 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1201 | ep, *asoc, |
1da177e4 LT |
1202 | event_arg, status, |
1203 | commands, gfp))) | |
1204 | goto bail; | |
1205 | ||
1206 | switch (status) { | |
1207 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1208 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1209 | "event_type:%d, event_id:%d\n", __func__, state, | |
1210 | event_type, subtype.chunk); | |
1da177e4 LT |
1211 | break; |
1212 | ||
1213 | case SCTP_DISPOSITION_NOMEM: | |
1214 | /* We ran out of memory, so we need to discard this | |
1215 | * packet. | |
1216 | */ | |
1217 | /* BUG--we should now recover some memory, probably by | |
1218 | * reneging... | |
1219 | */ | |
1220 | error = -ENOMEM; | |
1221 | break; | |
1222 | ||
d808ad9a | 1223 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1224 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1225 | /* This should now be a command. */ |
649621e3 | 1226 | *asoc = NULL; |
1da177e4 LT |
1227 | break; |
1228 | ||
1229 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1230 | /* |
1231 | * We should no longer have much work to do here as the | |
1232 | * real work has been done as explicit commands above. | |
1233 | */ | |
1234 | break; | |
1235 | ||
1236 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1237 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1238 | state, subtype.chunk); | |
1da177e4 LT |
1239 | break; |
1240 | ||
1241 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1242 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1243 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1244 | break; |
1245 | ||
1246 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1247 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1248 | state, event_type, subtype.chunk); |
1249 | BUG(); | |
1250 | break; | |
1251 | ||
1252 | default: | |
145ce502 | 1253 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1254 | status, state, event_type, subtype.chunk); |
1255 | BUG(); | |
1256 | break; | |
3ff50b79 | 1257 | } |
1da177e4 LT |
1258 | |
1259 | bail: | |
1260 | return error; | |
1261 | } | |
1262 | ||
1263 | /******************************************************************** | |
1264 | * 2nd Level Abstractions | |
1265 | ********************************************************************/ | |
1266 | ||
1267 | /* This is the side-effect interpreter. */ | |
61f0eb07 | 1268 | static int sctp_cmd_interpreter(enum sctp_event event_type, |
bfc6f827 | 1269 | union sctp_subtype subtype, |
52106019 | 1270 | enum sctp_state state, |
1da177e4 LT |
1271 | struct sctp_endpoint *ep, |
1272 | struct sctp_association *asoc, | |
1273 | void *event_arg, | |
172a1599 | 1274 | enum sctp_disposition status, |
a85bbeb2 | 1275 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1276 | gfp_t gfp) |
1da177e4 | 1277 | { |
172a1599 XL |
1278 | struct sctp_sock *sp = sctp_sk(ep->base.sk); |
1279 | struct sctp_chunk *chunk = NULL, *new_obj; | |
1da177e4 | 1280 | struct sctp_packet *packet; |
172a1599 | 1281 | struct sctp_sackhdr sackh; |
1da177e4 | 1282 | struct timer_list *timer; |
1da177e4 | 1283 | struct sctp_transport *t; |
172a1599 XL |
1284 | unsigned long timeout; |
1285 | struct sctp_cmd *cmd; | |
1da177e4 | 1286 | int local_cork = 0; |
172a1599 XL |
1287 | int error = 0; |
1288 | int force; | |
1da177e4 LT |
1289 | |
1290 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1291 | chunk = event_arg; |
1da177e4 LT |
1292 | |
1293 | /* Note: This whole file is a huge candidate for rework. | |
1294 | * For example, each command could either have its own handler, so | |
1295 | * the loop would look like: | |
1296 | * while (cmds) | |
1297 | * cmd->handle(x, y, z) | |
1298 | * --jgrimm | |
1299 | */ | |
1300 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1301 | switch (cmd->verb) { | |
1302 | case SCTP_CMD_NOP: | |
1303 | /* Do nothing. */ | |
1304 | break; | |
1305 | ||
1306 | case SCTP_CMD_NEW_ASOC: | |
1307 | /* Register a new association. */ | |
1308 | if (local_cork) { | |
cea8768f | 1309 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1310 | local_cork = 0; |
1311 | } | |
f9e42b85 | 1312 | |
1da177e4 | 1313 | /* Register with the endpoint. */ |
f9e42b85 DB |
1314 | asoc = cmd->obj.asoc; |
1315 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1316 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1317 | break; |
1318 | ||
1319 | case SCTP_CMD_UPDATE_ASSOC: | |
5ee8aa68 | 1320 | sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc); |
1da177e4 LT |
1321 | break; |
1322 | ||
1323 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1324 | sctp_outq_teardown(&asoc->outqueue); | |
1325 | break; | |
1326 | ||
d808ad9a | 1327 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1328 | if (local_cork) { |
cea8768f | 1329 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1330 | local_cork = 0; |
1331 | } | |
1332 | /* Delete the current association. */ | |
1333 | sctp_cmd_delete_tcb(commands, asoc); | |
1334 | asoc = NULL; | |
1335 | break; | |
1336 | ||
1337 | case SCTP_CMD_NEW_STATE: | |
1338 | /* Enter a new state. */ | |
1339 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1340 | break; | |
1341 | ||
1342 | case SCTP_CMD_REPORT_TSN: | |
1343 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1344 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1345 | cmd->obj.u32, NULL); |
1da177e4 LT |
1346 | break; |
1347 | ||
1348 | case SCTP_CMD_REPORT_FWDTSN: | |
1349 | /* Move the Cumulattive TSN Ack ahead. */ | |
1350 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1351 | ||
ea2dfb37 VY |
1352 | /* purge the fragmentation queue */ |
1353 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1354 | ||
1da177e4 LT |
1355 | /* Abort any in progress partial delivery. */ |
1356 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1357 | break; | |
1358 | ||
1359 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1360 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1361 | break; |
1da177e4 LT |
1362 | |
1363 | case SCTP_CMD_GEN_SACK: | |
1364 | /* Generate a Selective ACK. | |
1365 | * The argument tells us whether to just count | |
1366 | * the packet and MAYBE generate a SACK, or | |
1367 | * force a SACK out. | |
1368 | */ | |
1369 | force = cmd->obj.i32; | |
1370 | error = sctp_gen_sack(asoc, force, commands); | |
1371 | break; | |
1372 | ||
1373 | case SCTP_CMD_PROCESS_SACK: | |
1374 | /* Process an inbound SACK. */ | |
1375 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1376 | cmd->obj.chunk); |
1da177e4 LT |
1377 | break; |
1378 | ||
1379 | case SCTP_CMD_GEN_INIT_ACK: | |
1380 | /* Generate an INIT ACK chunk. */ | |
1381 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1382 | 0); | |
1383 | if (!new_obj) | |
1384 | goto nomem; | |
1385 | ||
1386 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1387 | SCTP_CHUNK(new_obj)); | |
1388 | break; | |
1389 | ||
1390 | case SCTP_CMD_PEER_INIT: | |
1391 | /* Process a unified INIT from the peer. | |
1392 | * Note: Only used during INIT-ACK processing. If | |
1393 | * there is an error just return to the outter | |
1394 | * layer which will bail. | |
1395 | */ | |
1396 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1397 | cmd->obj.init, gfp); |
1da177e4 LT |
1398 | break; |
1399 | ||
1400 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1401 | /* Generate a COOKIE ECHO chunk. */ | |
1402 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1403 | if (!new_obj) { | |
b26ddd81 NH |
1404 | if (cmd->obj.chunk) |
1405 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1406 | goto nomem; |
1407 | } | |
1408 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1409 | SCTP_CHUNK(new_obj)); | |
1410 | ||
1411 | /* If there is an ERROR chunk to be sent along with | |
1412 | * the COOKIE_ECHO, send it, too. | |
1413 | */ | |
b26ddd81 | 1414 | if (cmd->obj.chunk) |
1da177e4 | 1415 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1416 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1417 | |
96cd0d3d VY |
1418 | if (new_obj->transport) { |
1419 | new_obj->transport->init_sent_count++; | |
1420 | asoc->init_last_sent_to = new_obj->transport; | |
1421 | } | |
1422 | ||
1da177e4 | 1423 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1424 | * enabling COOKIE-ECHO + DATA bundling during |
1425 | * multihoming stale cookie scenarios, the following | |
1426 | * command plays with asoc->peer.retran_path to | |
1427 | * avoid the problem of sending the COOKIE-ECHO and | |
1428 | * DATA in different paths, which could result | |
1429 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1430 | * is processed first by the server. Checking the |
1431 | * init error counter simply causes this command | |
1432 | * to be executed only during failed attempts of | |
1433 | * association establishment. | |
1434 | */ | |
3f7a87d2 FF |
1435 | if ((asoc->peer.retran_path != |
1436 | asoc->peer.primary_path) && | |
1437 | (asoc->init_err_counter > 0)) { | |
1438 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1439 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1440 | SCTP_NULL()); |
1441 | } | |
1442 | ||
1443 | break; | |
1444 | ||
1445 | case SCTP_CMD_GEN_SHUTDOWN: | |
1446 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1447 | * Reset error counts. | |
1448 | */ | |
1449 | asoc->overall_error_count = 0; | |
1450 | ||
1451 | /* Generate a SHUTDOWN chunk. */ | |
1452 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1453 | if (!new_obj) | |
1454 | goto nomem; | |
1455 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1456 | SCTP_CHUNK(new_obj)); | |
1457 | break; | |
1458 | ||
1459 | case SCTP_CMD_CHUNK_ULP: | |
1460 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1461 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1462 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1463 | ||
b26ddd81 | 1464 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1465 | GFP_ATOMIC); |
1466 | break; | |
1467 | ||
1468 | case SCTP_CMD_EVENT_ULP: | |
1469 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1470 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1471 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1472 | ||
b26ddd81 | 1473 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1474 | break; |
1475 | ||
1476 | case SCTP_CMD_REPLY: | |
1477 | /* If an caller has not already corked, do cork. */ | |
1478 | if (!asoc->outqueue.cork) { | |
1479 | sctp_outq_cork(&asoc->outqueue); | |
1480 | local_cork = 1; | |
1481 | } | |
1482 | /* Send a chunk to our peer. */ | |
83dbc3d4 | 1483 | sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp); |
1da177e4 LT |
1484 | break; |
1485 | ||
1486 | case SCTP_CMD_SEND_PKT: | |
1487 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1488 | packet = cmd->obj.packet; |
cea8768f | 1489 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1490 | sctp_ootb_pkt_free(packet); |
1491 | break; | |
1492 | ||
b6157d8e VY |
1493 | case SCTP_CMD_T1_RETRAN: |
1494 | /* Mark a transport for retransmission. */ | |
1495 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1496 | SCTP_RTXR_T1_RTX); | |
1497 | break; | |
1498 | ||
1da177e4 LT |
1499 | case SCTP_CMD_RETRAN: |
1500 | /* Mark a transport for retransmission. */ | |
1501 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1502 | SCTP_RTXR_T3_RTX); | |
1503 | break; | |
1504 | ||
1da177e4 LT |
1505 | case SCTP_CMD_ECN_CE: |
1506 | /* Do delayed CE processing. */ | |
1507 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1508 | break; | |
1509 | ||
1510 | case SCTP_CMD_ECN_ECNE: | |
1511 | /* Do delayed ECNE processing. */ | |
1512 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1513 | chunk); | |
1514 | if (new_obj) | |
1515 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1516 | SCTP_CHUNK(new_obj)); | |
1517 | break; | |
1518 | ||
1519 | case SCTP_CMD_ECN_CWR: | |
1520 | /* Do delayed CWR processing. */ | |
1521 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1522 | break; | |
1523 | ||
1524 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1525 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1526 | break; |
1527 | ||
f8d96052 TG |
1528 | case SCTP_CMD_TIMER_START_ONCE: |
1529 | timer = &asoc->timers[cmd->obj.to]; | |
1530 | ||
1531 | if (timer_pending(timer)) | |
1532 | break; | |
1533 | /* fall through */ | |
1534 | ||
1da177e4 LT |
1535 | case SCTP_CMD_TIMER_START: |
1536 | timer = &asoc->timers[cmd->obj.to]; | |
1537 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1538 | BUG_ON(!timeout); |
1da177e4 LT |
1539 | |
1540 | timer->expires = jiffies + timeout; | |
1541 | sctp_association_hold(asoc); | |
1542 | add_timer(timer); | |
1543 | break; | |
1544 | ||
1545 | case SCTP_CMD_TIMER_RESTART: | |
1546 | timer = &asoc->timers[cmd->obj.to]; | |
1547 | timeout = asoc->timeouts[cmd->obj.to]; | |
1548 | if (!mod_timer(timer, jiffies + timeout)) | |
1549 | sctp_association_hold(asoc); | |
1550 | break; | |
1551 | ||
1552 | case SCTP_CMD_TIMER_STOP: | |
1553 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1554 | if (del_timer(timer)) |
1da177e4 LT |
1555 | sctp_association_put(asoc); |
1556 | break; | |
1557 | ||
3f7a87d2 | 1558 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1559 | chunk = cmd->obj.chunk; |
9919b455 WY |
1560 | t = sctp_assoc_choose_alter_transport(asoc, |
1561 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1562 | asoc->init_last_sent_to = t; |
1563 | chunk->transport = t; | |
1564 | t->init_sent_count++; | |
e0e9db17 VY |
1565 | /* Set the new transport as primary */ |
1566 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1567 | break; |
1568 | ||
1da177e4 LT |
1569 | case SCTP_CMD_INIT_RESTART: |
1570 | /* Do the needed accounting and updates | |
1571 | * associated with restarting an initialization | |
3f7a87d2 FF |
1572 | * timer. Only multiply the timeout by two if |
1573 | * all transports have been tried at the current | |
1574 | * timeout. | |
1575 | */ | |
96cd0d3d VY |
1576 | sctp_cmd_t1_timer_update(asoc, |
1577 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1578 | "INIT"); | |
3f7a87d2 FF |
1579 | |
1580 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1581 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1582 | break; | |
1583 | ||
1584 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1585 | /* Do the needed accounting and updates | |
1586 | * associated with restarting an initialization | |
1587 | * timer. Only multiply the timeout by two if | |
1588 | * all transports have been tried at the current | |
1589 | * timeout. | |
1da177e4 | 1590 | */ |
96cd0d3d VY |
1591 | sctp_cmd_t1_timer_update(asoc, |
1592 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1593 | "COOKIE"); | |
1da177e4 LT |
1594 | |
1595 | /* If we've sent any data bundled with | |
1596 | * COOKIE-ECHO we need to resend. | |
1597 | */ | |
9dbc15f0 RD |
1598 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1599 | transports) { | |
b6157d8e VY |
1600 | sctp_retransmit_mark(&asoc->outqueue, t, |
1601 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1602 | } |
1603 | ||
1604 | sctp_add_cmd_sf(commands, | |
1605 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1606 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1607 | break; |
1608 | ||
1609 | case SCTP_CMD_INIT_FAILED: | |
978aa047 | 1610 | sctp_cmd_init_failed(commands, asoc, cmd->obj.u32); |
1da177e4 LT |
1611 | break; |
1612 | ||
1613 | case SCTP_CMD_ASSOC_FAILED: | |
1614 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
978aa047 | 1615 | subtype, chunk, cmd->obj.u32); |
1da177e4 LT |
1616 | break; |
1617 | ||
3f7a87d2 FF |
1618 | case SCTP_CMD_INIT_COUNTER_INC: |
1619 | asoc->init_err_counter++; | |
1da177e4 LT |
1620 | break; |
1621 | ||
3f7a87d2 FF |
1622 | case SCTP_CMD_INIT_COUNTER_RESET: |
1623 | asoc->init_err_counter = 0; | |
1624 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1625 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1626 | transports) { | |
1627 | t->init_sent_count = 0; | |
1628 | } | |
1da177e4 LT |
1629 | break; |
1630 | ||
1631 | case SCTP_CMD_REPORT_DUP: | |
1632 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1633 | cmd->obj.u32); | |
1634 | break; | |
1635 | ||
1636 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1637 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1638 | break; |
1639 | ||
1640 | case SCTP_CMD_STRIKE: | |
1641 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1642 | sctp_do_8_2_transport_strike(commands, asoc, |
1643 | cmd->obj.transport, 0); | |
7e99013a VY |
1644 | break; |
1645 | ||
1646 | case SCTP_CMD_TRANSPORT_IDLE: | |
1647 | t = cmd->obj.transport; | |
1648 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1649 | break; |
1650 | ||
7e99013a | 1651 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1652 | t = cmd->obj.transport; |
5aa93bcf NH |
1653 | sctp_do_8_2_transport_strike(commands, asoc, |
1654 | t, 1); | |
7e99013a | 1655 | t->hb_sent = 1; |
1da177e4 LT |
1656 | break; |
1657 | ||
1658 | case SCTP_CMD_TRANSPORT_ON: | |
1659 | t = cmd->obj.transport; | |
1660 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1661 | break; | |
1662 | ||
1663 | case SCTP_CMD_HB_TIMERS_START: | |
1664 | sctp_cmd_hb_timers_start(commands, asoc); | |
1665 | break; | |
1666 | ||
1667 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1668 | t = cmd->obj.transport; | |
ba6f5e33 | 1669 | sctp_transport_reset_hb_timer(t); |
1da177e4 LT |
1670 | break; |
1671 | ||
1672 | case SCTP_CMD_HB_TIMERS_STOP: | |
1673 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1674 | break; | |
1675 | ||
1676 | case SCTP_CMD_REPORT_ERROR: | |
1677 | error = cmd->obj.error; | |
1678 | break; | |
1679 | ||
1680 | case SCTP_CMD_PROCESS_CTSN: | |
1681 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1682 | sackh.cum_tsn_ack = cmd->obj.be32; |
f6fc6bc0 XL |
1683 | sackh.a_rwnd = htonl(asoc->peer.rwnd + |
1684 | asoc->outqueue.outstanding_bytes); | |
1da177e4 LT |
1685 | sackh.num_gap_ack_blocks = 0; |
1686 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1687 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1688 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1689 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1690 | break; |
1691 | ||
1692 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1693 | /* We need to discard the whole packet. |
1694 | * Uncork the queue since there might be | |
1695 | * responses pending | |
1696 | */ | |
1da177e4 | 1697 | chunk->pdiscard = 1; |
2e3216cd | 1698 | if (asoc) { |
cea8768f | 1699 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1700 | local_cork = 0; |
1701 | } | |
1da177e4 LT |
1702 | break; |
1703 | ||
1704 | case SCTP_CMD_RTO_PENDING: | |
1705 | t = cmd->obj.transport; | |
1706 | t->rto_pending = 1; | |
1707 | break; | |
1708 | ||
1709 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1710 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1711 | break; |
1712 | ||
1713 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1714 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1715 | GFP_ATOMIC); |
1716 | break; | |
1717 | ||
1718 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1719 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1720 | break; |
1721 | ||
1722 | case SCTP_CMD_PROCESS_OPERR: | |
1723 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1724 | break; | |
1725 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1726 | asoc->peer.i.init_tag = 0; | |
1727 | break; | |
1728 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1729 | sctp_cmd_del_non_primary(asoc); | |
1730 | break; | |
1731 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1732 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1733 | break; | |
1734 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1735 | t = asoc->peer.retran_path; | |
1736 | asoc->peer.retran_path = asoc->peer.primary_path; | |
83dbc3d4 | 1737 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1738 | local_cork = 0; |
1739 | asoc->peer.retran_path = t; | |
1740 | break; | |
8de8c873 SS |
1741 | case SCTP_CMD_SET_SK_ERR: |
1742 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1743 | break; | |
07d93967 VY |
1744 | case SCTP_CMD_ASSOC_CHANGE: |
1745 | sctp_cmd_assoc_change(commands, asoc, | |
1746 | cmd->obj.u8); | |
1747 | break; | |
1748 | case SCTP_CMD_ADAPTATION_IND: | |
1749 | sctp_cmd_adaptation_ind(commands, asoc); | |
1750 | break; | |
1751 | ||
730fc3d0 VY |
1752 | case SCTP_CMD_ASSOC_SHKEY: |
1753 | error = sctp_auth_asoc_init_active_key(asoc, | |
1754 | GFP_ATOMIC); | |
1755 | break; | |
f4ad85ca GJ |
1756 | case SCTP_CMD_UPDATE_INITTAG: |
1757 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1758 | break; | |
9c5c62be VY |
1759 | case SCTP_CMD_SEND_MSG: |
1760 | if (!asoc->outqueue.cork) { | |
1761 | sctp_outq_cork(&asoc->outqueue); | |
1762 | local_cork = 1; | |
1763 | } | |
66388f2c | 1764 | sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1765 | break; |
c0786693 VY |
1766 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1767 | sctp_cmd_send_asconf(asoc); | |
1768 | break; | |
a000c01e WY |
1769 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1770 | sctp_asconf_queue_teardown(asoc); | |
1771 | break; | |
d5ccd496 MM |
1772 | |
1773 | case SCTP_CMD_SET_ASOC: | |
8cd5c25f XL |
1774 | if (asoc && local_cork) { |
1775 | sctp_outq_uncork(&asoc->outqueue, gfp); | |
1776 | local_cork = 0; | |
1777 | } | |
d5ccd496 MM |
1778 | asoc = cmd->obj.asoc; |
1779 | break; | |
1780 | ||
1da177e4 | 1781 | default: |
b26ddd81 NH |
1782 | pr_warn("Impossible command: %u\n", |
1783 | cmd->verb); | |
1da177e4 | 1784 | break; |
3ff50b79 SH |
1785 | } |
1786 | ||
1da177e4 LT |
1787 | if (error) |
1788 | break; | |
1789 | } | |
1790 | ||
1791 | out: | |
2e3216cd VY |
1792 | /* If this is in response to a received chunk, wait until |
1793 | * we are done with the packet to open the queue so that we don't | |
1794 | * send multiple packets in response to a single request. | |
1795 | */ | |
1796 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1797 | if (chunk->end_of_packet || chunk->singleton) | |
83dbc3d4 | 1798 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1799 | } else if (local_cork) |
83dbc3d4 | 1800 | sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 | 1801 | |
0970f5b3 MRL |
1802 | if (sp->data_ready_signalled) |
1803 | sp->data_ready_signalled = 0; | |
1804 | ||
1da177e4 LT |
1805 | return error; |
1806 | nomem: | |
1807 | error = -ENOMEM; | |
1808 | goto out; | |
1809 | } | |
1810 |