Commit | Line | Data |
---|---|---|
9fb9cbb1 YK |
1 | /* |
2 | * Connection tracking protocol helper module for SCTP. | |
601e68e1 YH |
3 | * |
4 | * SCTP is defined in RFC 2960. References to various sections in this code | |
9fb9cbb1 | 5 | * are to this RFC. |
601e68e1 | 6 | * |
9fb9cbb1 YK |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
9fb9cbb1 YK |
10 | */ |
11 | ||
12 | #include <linux/types.h> | |
9fb9cbb1 YK |
13 | #include <linux/timer.h> |
14 | #include <linux/netfilter.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/in.h> | |
17 | #include <linux/ip.h> | |
18 | #include <linux/sctp.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/seq_file.h> | |
40a839fd YK |
21 | #include <linux/spinlock.h> |
22 | #include <linux/interrupt.h> | |
9fb9cbb1 YK |
23 | |
24 | #include <net/netfilter/nf_conntrack.h> | |
605dcad6 | 25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
f6180121 | 26 | #include <net/netfilter/nf_conntrack_ecache.h> |
9fb9cbb1 | 27 | |
9fb9cbb1 YK |
28 | /* Protects conntrack->proto.sctp */ |
29 | static DEFINE_RWLOCK(sctp_lock); | |
30 | ||
31 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more | |
601e68e1 | 32 | closely. They're more complex. --RR |
9fb9cbb1 YK |
33 | |
34 | And so for me for SCTP :D -Kiran */ | |
35 | ||
36 | static const char *sctp_conntrack_names[] = { | |
37 | "NONE", | |
38 | "CLOSED", | |
39 | "COOKIE_WAIT", | |
40 | "COOKIE_ECHOED", | |
41 | "ESTABLISHED", | |
42 | "SHUTDOWN_SENT", | |
43 | "SHUTDOWN_RECD", | |
44 | "SHUTDOWN_ACK_SENT", | |
45 | }; | |
46 | ||
47 | #define SECS * HZ | |
48 | #define MINS * 60 SECS | |
49 | #define HOURS * 60 MINS | |
50 | #define DAYS * 24 HOURS | |
51 | ||
94aec08e BH |
52 | static unsigned int nf_ct_sctp_timeout_closed __read_mostly = 10 SECS; |
53 | static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly = 3 SECS; | |
54 | static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly = 3 SECS; | |
55 | static unsigned int nf_ct_sctp_timeout_established __read_mostly = 5 DAYS; | |
56 | static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly = 300 SECS / 1000; | |
57 | static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly = 300 SECS / 1000; | |
58 | static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS; | |
9fb9cbb1 | 59 | |
babbdb1a | 60 | static unsigned int * sctp_timeouts[] |
9fb9cbb1 YK |
61 | = { NULL, /* SCTP_CONNTRACK_NONE */ |
62 | &nf_ct_sctp_timeout_closed, /* SCTP_CONNTRACK_CLOSED */ | |
63 | &nf_ct_sctp_timeout_cookie_wait, /* SCTP_CONNTRACK_COOKIE_WAIT */ | |
64 | &nf_ct_sctp_timeout_cookie_echoed, /* SCTP_CONNTRACK_COOKIE_ECHOED */ | |
65 | &nf_ct_sctp_timeout_established, /* SCTP_CONNTRACK_ESTABLISHED */ | |
66 | &nf_ct_sctp_timeout_shutdown_sent, /* SCTP_CONNTRACK_SHUTDOWN_SENT */ | |
67 | &nf_ct_sctp_timeout_shutdown_recd, /* SCTP_CONNTRACK_SHUTDOWN_RECD */ | |
68 | &nf_ct_sctp_timeout_shutdown_ack_sent /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */ | |
69 | }; | |
70 | ||
71 | #define sNO SCTP_CONNTRACK_NONE | |
72 | #define sCL SCTP_CONNTRACK_CLOSED | |
73 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT | |
74 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED | |
75 | #define sES SCTP_CONNTRACK_ESTABLISHED | |
76 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT | |
77 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD | |
78 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT | |
79 | #define sIV SCTP_CONNTRACK_MAX | |
80 | ||
601e68e1 | 81 | /* |
9fb9cbb1 YK |
82 | These are the descriptions of the states: |
83 | ||
601e68e1 | 84 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 85 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 86 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
87 | point. Please note the subtleties. -Kiran |
88 | ||
89 | NONE - Nothing so far. | |
601e68e1 YH |
90 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
91 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
92 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. |
93 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. | |
94 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. | |
95 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. | |
96 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite | |
601e68e1 YH |
97 | to that of the SHUTDOWN chunk. |
98 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of | |
99 | the SHUTDOWN chunk. Connection is closed. | |
9fb9cbb1 YK |
100 | */ |
101 | ||
102 | /* TODO | |
601e68e1 | 103 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
104 | This messes things when an INIT comes in the reply direction in CLOSED |
105 | state. | |
601e68e1 | 106 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
107 | cookie echoed to closed. |
108 | - Sec 5.2.4 of RFC 2960 | |
109 | - Multi Homing support. | |
110 | */ | |
111 | ||
112 | /* SCTP conntrack state transitions */ | |
a5e73c29 | 113 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
114 | { |
115 | /* ORIGINAL */ | |
116 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
117 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA}, | |
118 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
119 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
120 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA}, | |
121 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
122 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/ | |
123 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ | |
124 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */ | |
125 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
126 | }, | |
127 | { | |
128 | /* REPLY */ | |
129 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
130 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */ | |
131 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
132 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
133 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA}, | |
134 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
135 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA}, | |
136 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */ | |
137 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA}, | |
138 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
139 | } | |
140 | }; | |
141 | ||
142 | static int sctp_pkt_to_tuple(const struct sk_buff *skb, | |
143 | unsigned int dataoff, | |
144 | struct nf_conntrack_tuple *tuple) | |
145 | { | |
146 | sctp_sctphdr_t _hdr, *hp; | |
147 | ||
9fb9cbb1 YK |
148 | /* Actually only need first 8 bytes. */ |
149 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
150 | if (hp == NULL) | |
151 | return 0; | |
152 | ||
153 | tuple->src.u.sctp.port = hp->source; | |
154 | tuple->dst.u.sctp.port = hp->dest; | |
155 | return 1; | |
156 | } | |
157 | ||
158 | static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple, | |
159 | const struct nf_conntrack_tuple *orig) | |
160 | { | |
9fb9cbb1 YK |
161 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
162 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
163 | return 1; | |
164 | } | |
165 | ||
166 | /* Print out the per-protocol part of the tuple. */ | |
167 | static int sctp_print_tuple(struct seq_file *s, | |
168 | const struct nf_conntrack_tuple *tuple) | |
169 | { | |
9fb9cbb1 YK |
170 | return seq_printf(s, "sport=%hu dport=%hu ", |
171 | ntohs(tuple->src.u.sctp.port), | |
172 | ntohs(tuple->dst.u.sctp.port)); | |
173 | } | |
174 | ||
175 | /* Print out the private part of the conntrack. */ | |
112f35c9 | 176 | static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) |
9fb9cbb1 YK |
177 | { |
178 | enum sctp_conntrack state; | |
179 | ||
9fb9cbb1 | 180 | read_lock_bh(&sctp_lock); |
112f35c9 | 181 | state = ct->proto.sctp.state; |
9fb9cbb1 YK |
182 | read_unlock_bh(&sctp_lock); |
183 | ||
184 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); | |
185 | } | |
186 | ||
187 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
e79ec50b JE |
188 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
189 | (offset) < (skb)->len && \ | |
190 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
191 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
192 | |
193 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 194 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
195 | const struct sk_buff *skb, |
196 | unsigned int dataoff, | |
35c6d3cb | 197 | unsigned long *map) |
9fb9cbb1 YK |
198 | { |
199 | u_int32_t offset, count; | |
200 | sctp_chunkhdr_t _sch, *sch; | |
201 | int flag; | |
202 | ||
9fb9cbb1 YK |
203 | flag = 0; |
204 | ||
205 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 206 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 207 | |
5447d477 PM |
208 | if (sch->type == SCTP_CID_INIT || |
209 | sch->type == SCTP_CID_INIT_ACK || | |
210 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 211 | flag = 1; |
9fb9cbb1 | 212 | |
e17df688 PM |
213 | /* |
214 | * Cookie Ack/Echo chunks not the first OR | |
215 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
216 | * OR zero-length. | |
217 | */ | |
5447d477 PM |
218 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
219 | sch->type == SCTP_CID_COOKIE_ECHO || | |
220 | flag) && | |
221 | count != 0) || !sch->length) { | |
0d53778e | 222 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
223 | return 1; |
224 | } | |
225 | ||
5447d477 | 226 | if (map) |
35c6d3cb | 227 | set_bit(sch->type, map); |
9fb9cbb1 YK |
228 | } |
229 | ||
0d53778e | 230 | pr_debug("Basic checks passed\n"); |
dd7271fe | 231 | return count == 0; |
9fb9cbb1 YK |
232 | } |
233 | ||
234 | static int new_state(enum ip_conntrack_dir dir, | |
235 | enum sctp_conntrack cur_state, | |
236 | int chunk_type) | |
237 | { | |
238 | int i; | |
239 | ||
0d53778e | 240 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
241 | |
242 | switch (chunk_type) { | |
5447d477 PM |
243 | case SCTP_CID_INIT: |
244 | pr_debug("SCTP_CID_INIT\n"); | |
245 | i = 0; | |
246 | break; | |
247 | case SCTP_CID_INIT_ACK: | |
248 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
249 | i = 1; | |
250 | break; | |
251 | case SCTP_CID_ABORT: | |
252 | pr_debug("SCTP_CID_ABORT\n"); | |
253 | i = 2; | |
254 | break; | |
255 | case SCTP_CID_SHUTDOWN: | |
256 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
257 | i = 3; | |
258 | break; | |
259 | case SCTP_CID_SHUTDOWN_ACK: | |
260 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
261 | i = 4; | |
262 | break; | |
263 | case SCTP_CID_ERROR: | |
264 | pr_debug("SCTP_CID_ERROR\n"); | |
265 | i = 5; | |
266 | break; | |
267 | case SCTP_CID_COOKIE_ECHO: | |
268 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
269 | i = 6; | |
270 | break; | |
271 | case SCTP_CID_COOKIE_ACK: | |
272 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
273 | i = 7; | |
274 | break; | |
275 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
276 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
277 | i = 8; | |
278 | break; | |
279 | default: | |
280 | /* Other chunks like DATA, SACK, HEARTBEAT and | |
281 | its ACK do not cause a change in state */ | |
282 | pr_debug("Unknown chunk type, Will stay in %s\n", | |
283 | sctp_conntrack_names[cur_state]); | |
284 | return cur_state; | |
9fb9cbb1 YK |
285 | } |
286 | ||
0d53778e PM |
287 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
288 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
289 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
290 | |
291 | return sctp_conntracks[dir][i][cur_state]; | |
292 | } | |
293 | ||
b37e933a | 294 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 295 | static int sctp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
296 | const struct sk_buff *skb, |
297 | unsigned int dataoff, | |
298 | enum ip_conntrack_info ctinfo, | |
299 | int pf, | |
300 | unsigned int hooknum) | |
301 | { | |
302 | enum sctp_conntrack newconntrack, oldsctpstate; | |
8528819a | 303 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
9fb9cbb1 YK |
304 | sctp_sctphdr_t _sctph, *sh; |
305 | sctp_chunkhdr_t _sch, *sch; | |
306 | u_int32_t offset, count; | |
35c6d3cb | 307 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 308 | |
9fb9cbb1 YK |
309 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
310 | if (sh == NULL) | |
b37e933a | 311 | goto out; |
9fb9cbb1 | 312 | |
112f35c9 | 313 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 314 | goto out; |
9fb9cbb1 YK |
315 | |
316 | /* Check the verification tag (Sec 8.5) */ | |
35c6d3cb PM |
317 | if (!test_bit(SCTP_CID_INIT, map) && |
318 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
319 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
320 | !test_bit(SCTP_CID_ABORT, map) && | |
321 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
8528819a | 322 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 323 | pr_debug("Verification tag check failed\n"); |
b37e933a | 324 | goto out; |
9fb9cbb1 YK |
325 | } |
326 | ||
327 | oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX; | |
328 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
329 | write_lock_bh(&sctp_lock); | |
330 | ||
331 | /* Special cases of Verification tag check (Sec 8.5.1) */ | |
332 | if (sch->type == SCTP_CID_INIT) { | |
333 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
334 | if (sh->vtag != 0) |
335 | goto out_unlock; | |
9fb9cbb1 YK |
336 | } else if (sch->type == SCTP_CID_ABORT) { |
337 | /* Sec 8.5.1 (B) */ | |
8528819a | 338 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
339 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
340 | goto out_unlock; | |
9fb9cbb1 YK |
341 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
342 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
343 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
344 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
b37e933a PM |
345 | (sch->flags & 1)) |
346 | goto out_unlock; | |
9fb9cbb1 YK |
347 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
348 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
349 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
350 | goto out_unlock; | |
9fb9cbb1 YK |
351 | } |
352 | ||
112f35c9 | 353 | oldsctpstate = ct->proto.sctp.state; |
8528819a | 354 | newconntrack = new_state(dir, oldsctpstate, sch->type); |
9fb9cbb1 YK |
355 | |
356 | /* Invalid */ | |
357 | if (newconntrack == SCTP_CONNTRACK_MAX) { | |
0d53778e PM |
358 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
359 | "conntrack=%u\n", | |
8528819a | 360 | dir, sch->type, oldsctpstate); |
b37e933a | 361 | goto out_unlock; |
9fb9cbb1 YK |
362 | } |
363 | ||
364 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
365 | if (sch->type == SCTP_CID_INIT || |
366 | sch->type == SCTP_CID_INIT_ACK) { | |
9fb9cbb1 YK |
367 | sctp_inithdr_t _inithdr, *ih; |
368 | ||
369 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 370 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
371 | if (ih == NULL) |
372 | goto out_unlock; | |
0d53778e | 373 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
374 | ih->init_tag, !dir); |
375 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
376 | } |
377 | ||
112f35c9 | 378 | ct->proto.sctp.state = newconntrack; |
9fb9cbb1 YK |
379 | if (oldsctpstate != newconntrack) |
380 | nf_conntrack_event_cache(IPCT_PROTOINFO, skb); | |
381 | write_unlock_bh(&sctp_lock); | |
382 | } | |
383 | ||
112f35c9 | 384 | nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[newconntrack]); |
9fb9cbb1 | 385 | |
5447d477 | 386 | if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 387 | dir == IP_CT_DIR_REPLY && |
5447d477 | 388 | newconntrack == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 389 | pr_debug("Setting assured bit\n"); |
112f35c9 | 390 | set_bit(IPS_ASSURED_BIT, &ct->status); |
9fb9cbb1 YK |
391 | nf_conntrack_event_cache(IPCT_STATUS, skb); |
392 | } | |
393 | ||
394 | return NF_ACCEPT; | |
b37e933a PM |
395 | |
396 | out_unlock: | |
397 | write_unlock_bh(&sctp_lock); | |
398 | out: | |
399 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
400 | } |
401 | ||
402 | /* Called when a new connection for this protocol found. */ | |
112f35c9 | 403 | static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
9fb9cbb1 YK |
404 | unsigned int dataoff) |
405 | { | |
406 | enum sctp_conntrack newconntrack; | |
407 | sctp_sctphdr_t _sctph, *sh; | |
408 | sctp_chunkhdr_t _sch, *sch; | |
409 | u_int32_t offset, count; | |
35c6d3cb | 410 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 411 | |
9fb9cbb1 YK |
412 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
413 | if (sh == NULL) | |
414 | return 0; | |
415 | ||
112f35c9 | 416 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
9fb9cbb1 YK |
417 | return 0; |
418 | ||
419 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
35c6d3cb PM |
420 | if (test_bit(SCTP_CID_ABORT, map) || |
421 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
422 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
9fb9cbb1 | 423 | return 0; |
9fb9cbb1 YK |
424 | |
425 | newconntrack = SCTP_CONNTRACK_MAX; | |
426 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
427 | /* Don't need lock here: this conntrack not in circulation yet */ | |
601e68e1 | 428 | newconntrack = new_state(IP_CT_DIR_ORIGINAL, |
9fb9cbb1 YK |
429 | SCTP_CONNTRACK_NONE, sch->type); |
430 | ||
431 | /* Invalid: delete conntrack */ | |
99d24ede PM |
432 | if (newconntrack == SCTP_CONNTRACK_NONE || |
433 | newconntrack == SCTP_CONNTRACK_MAX) { | |
0d53778e | 434 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
9fb9cbb1 YK |
435 | return 0; |
436 | } | |
437 | ||
438 | /* Copy the vtag into the state info */ | |
439 | if (sch->type == SCTP_CID_INIT) { | |
440 | if (sh->vtag == 0) { | |
441 | sctp_inithdr_t _inithdr, *ih; | |
442 | ||
443 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 444 | sizeof(_inithdr), &_inithdr); |
9fb9cbb1 YK |
445 | if (ih == NULL) |
446 | return 0; | |
447 | ||
0d53778e PM |
448 | pr_debug("Setting vtag %x for new conn\n", |
449 | ih->init_tag); | |
9fb9cbb1 | 450 | |
112f35c9 | 451 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
9fb9cbb1 YK |
452 | ih->init_tag; |
453 | } else { | |
454 | /* Sec 8.5.1 (A) */ | |
455 | return 0; | |
456 | } | |
457 | } | |
458 | /* If it is a shutdown ack OOTB packet, we expect a return | |
459 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
460 | else { | |
0d53778e PM |
461 | pr_debug("Setting vtag %x for new conn OOTB\n", |
462 | sh->vtag); | |
112f35c9 | 463 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
9fb9cbb1 YK |
464 | } |
465 | ||
112f35c9 | 466 | ct->proto.sctp.state = newconntrack; |
9fb9cbb1 YK |
467 | } |
468 | ||
469 | return 1; | |
470 | } | |
471 | ||
9fb9cbb1 | 472 | #ifdef CONFIG_SYSCTL |
933a41e7 PM |
473 | static unsigned int sctp_sysctl_table_users; |
474 | static struct ctl_table_header *sctp_sysctl_header; | |
475 | static struct ctl_table sctp_sysctl_table[] = { | |
9fb9cbb1 | 476 | { |
9fb9cbb1 YK |
477 | .procname = "nf_conntrack_sctp_timeout_closed", |
478 | .data = &nf_ct_sctp_timeout_closed, | |
479 | .maxlen = sizeof(unsigned int), | |
480 | .mode = 0644, | |
481 | .proc_handler = &proc_dointvec_jiffies, | |
482 | }, | |
483 | { | |
9fb9cbb1 YK |
484 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
485 | .data = &nf_ct_sctp_timeout_cookie_wait, | |
486 | .maxlen = sizeof(unsigned int), | |
487 | .mode = 0644, | |
488 | .proc_handler = &proc_dointvec_jiffies, | |
489 | }, | |
490 | { | |
9fb9cbb1 YK |
491 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
492 | .data = &nf_ct_sctp_timeout_cookie_echoed, | |
493 | .maxlen = sizeof(unsigned int), | |
494 | .mode = 0644, | |
495 | .proc_handler = &proc_dointvec_jiffies, | |
496 | }, | |
497 | { | |
9fb9cbb1 YK |
498 | .procname = "nf_conntrack_sctp_timeout_established", |
499 | .data = &nf_ct_sctp_timeout_established, | |
500 | .maxlen = sizeof(unsigned int), | |
501 | .mode = 0644, | |
502 | .proc_handler = &proc_dointvec_jiffies, | |
503 | }, | |
504 | { | |
9fb9cbb1 YK |
505 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
506 | .data = &nf_ct_sctp_timeout_shutdown_sent, | |
507 | .maxlen = sizeof(unsigned int), | |
508 | .mode = 0644, | |
509 | .proc_handler = &proc_dointvec_jiffies, | |
510 | }, | |
511 | { | |
9fb9cbb1 YK |
512 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
513 | .data = &nf_ct_sctp_timeout_shutdown_recd, | |
514 | .maxlen = sizeof(unsigned int), | |
515 | .mode = 0644, | |
516 | .proc_handler = &proc_dointvec_jiffies, | |
517 | }, | |
518 | { | |
9fb9cbb1 YK |
519 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
520 | .data = &nf_ct_sctp_timeout_shutdown_ack_sent, | |
521 | .maxlen = sizeof(unsigned int), | |
522 | .mode = 0644, | |
523 | .proc_handler = &proc_dointvec_jiffies, | |
524 | }, | |
9fb9cbb1 | 525 | { |
933a41e7 PM |
526 | .ctl_name = 0 |
527 | } | |
9fb9cbb1 | 528 | }; |
a999e683 PM |
529 | |
530 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
531 | static struct ctl_table sctp_compat_sysctl_table[] = { | |
532 | { | |
a999e683 PM |
533 | .procname = "ip_conntrack_sctp_timeout_closed", |
534 | .data = &nf_ct_sctp_timeout_closed, | |
535 | .maxlen = sizeof(unsigned int), | |
536 | .mode = 0644, | |
537 | .proc_handler = &proc_dointvec_jiffies, | |
538 | }, | |
539 | { | |
a999e683 PM |
540 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
541 | .data = &nf_ct_sctp_timeout_cookie_wait, | |
542 | .maxlen = sizeof(unsigned int), | |
543 | .mode = 0644, | |
544 | .proc_handler = &proc_dointvec_jiffies, | |
545 | }, | |
546 | { | |
a999e683 PM |
547 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
548 | .data = &nf_ct_sctp_timeout_cookie_echoed, | |
549 | .maxlen = sizeof(unsigned int), | |
550 | .mode = 0644, | |
551 | .proc_handler = &proc_dointvec_jiffies, | |
552 | }, | |
553 | { | |
a999e683 PM |
554 | .procname = "ip_conntrack_sctp_timeout_established", |
555 | .data = &nf_ct_sctp_timeout_established, | |
556 | .maxlen = sizeof(unsigned int), | |
557 | .mode = 0644, | |
558 | .proc_handler = &proc_dointvec_jiffies, | |
559 | }, | |
560 | { | |
a999e683 PM |
561 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
562 | .data = &nf_ct_sctp_timeout_shutdown_sent, | |
563 | .maxlen = sizeof(unsigned int), | |
564 | .mode = 0644, | |
565 | .proc_handler = &proc_dointvec_jiffies, | |
566 | }, | |
567 | { | |
a999e683 PM |
568 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
569 | .data = &nf_ct_sctp_timeout_shutdown_recd, | |
570 | .maxlen = sizeof(unsigned int), | |
571 | .mode = 0644, | |
572 | .proc_handler = &proc_dointvec_jiffies, | |
573 | }, | |
574 | { | |
a999e683 PM |
575 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
576 | .data = &nf_ct_sctp_timeout_shutdown_ack_sent, | |
577 | .maxlen = sizeof(unsigned int), | |
578 | .mode = 0644, | |
579 | .proc_handler = &proc_dointvec_jiffies, | |
580 | }, | |
581 | { | |
582 | .ctl_name = 0 | |
583 | } | |
584 | }; | |
585 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 | 586 | #endif |
9fb9cbb1 | 587 | |
61075af5 | 588 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
933a41e7 PM |
589 | .l3proto = PF_INET, |
590 | .l4proto = IPPROTO_SCTP, | |
591 | .name = "sctp", | |
592 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
593 | .invert_tuple = sctp_invert_tuple, | |
594 | .print_tuple = sctp_print_tuple, | |
595 | .print_conntrack = sctp_print_conntrack, | |
596 | .packet = sctp_packet, | |
597 | .new = sctp_new, | |
598 | .me = THIS_MODULE, | |
c7212e9d PNA |
599 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
600 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
601 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
602 | .nla_policy = nf_ct_port_nla_policy, | |
603 | #endif | |
933a41e7 PM |
604 | #ifdef CONFIG_SYSCTL |
605 | .ctl_table_users = &sctp_sysctl_table_users, | |
606 | .ctl_table_header = &sctp_sysctl_header, | |
607 | .ctl_table = sctp_sysctl_table, | |
a999e683 PM |
608 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
609 | .ctl_compat_table = sctp_compat_sysctl_table, | |
610 | #endif | |
933a41e7 | 611 | #endif |
9fb9cbb1 YK |
612 | }; |
613 | ||
61075af5 | 614 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
933a41e7 PM |
615 | .l3proto = PF_INET6, |
616 | .l4proto = IPPROTO_SCTP, | |
617 | .name = "sctp", | |
618 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
619 | .invert_tuple = sctp_invert_tuple, | |
620 | .print_tuple = sctp_print_tuple, | |
621 | .print_conntrack = sctp_print_conntrack, | |
622 | .packet = sctp_packet, | |
623 | .new = sctp_new, | |
624 | .me = THIS_MODULE, | |
c7212e9d PNA |
625 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
626 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, | |
627 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
628 | .nla_policy = nf_ct_port_nla_policy, | |
629 | #endif | |
933a41e7 PM |
630 | #ifdef CONFIG_SYSCTL |
631 | .ctl_table_users = &sctp_sysctl_table_users, | |
632 | .ctl_table_header = &sctp_sysctl_header, | |
633 | .ctl_table = sctp_sysctl_table, | |
9fb9cbb1 | 634 | #endif |
933a41e7 | 635 | }; |
9fb9cbb1 | 636 | |
65b4b4e8 | 637 | int __init nf_conntrack_proto_sctp_init(void) |
9fb9cbb1 YK |
638 | { |
639 | int ret; | |
640 | ||
605dcad6 | 641 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4); |
9fb9cbb1 | 642 | if (ret) { |
605dcad6 | 643 | printk("nf_conntrack_l4proto_sctp4: protocol register failed\n"); |
9fb9cbb1 YK |
644 | goto out; |
645 | } | |
605dcad6 | 646 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6); |
9fb9cbb1 | 647 | if (ret) { |
605dcad6 | 648 | printk("nf_conntrack_l4proto_sctp6: protocol register failed\n"); |
9fb9cbb1 YK |
649 | goto cleanup_sctp4; |
650 | } | |
651 | ||
9fb9cbb1 YK |
652 | return ret; |
653 | ||
9fb9cbb1 | 654 | cleanup_sctp4: |
605dcad6 | 655 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
9fb9cbb1 | 656 | out: |
9fb9cbb1 YK |
657 | return ret; |
658 | } | |
659 | ||
65b4b4e8 | 660 | void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 | 661 | { |
605dcad6 MJ |
662 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
663 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
9fb9cbb1 YK |
664 | } |
665 | ||
65b4b4e8 AM |
666 | module_init(nf_conntrack_proto_sctp_init); |
667 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
668 | |
669 | MODULE_LICENSE("GPL"); | |
670 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
671 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); | |
d2483dde | 672 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |