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Commit | Line | Data |
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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 | |
c88130bc | 28 | /* Protects ct->proto.sctp */ |
9fb9cbb1 YK |
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 | ||
12c33aa2 | 36 | static const char *const sctp_conntrack_names[] = { |
9fb9cbb1 YK |
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 | ||
86c0bf40 PM |
52 | static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = { |
53 | [SCTP_CONNTRACK_CLOSED] = 10 SECS, | |
54 | [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS, | |
55 | [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS, | |
56 | [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS, | |
57 | [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000, | |
58 | [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000, | |
59 | [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, | |
60 | }; | |
9fb9cbb1 YK |
61 | |
62 | #define sNO SCTP_CONNTRACK_NONE | |
63 | #define sCL SCTP_CONNTRACK_CLOSED | |
64 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT | |
65 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED | |
66 | #define sES SCTP_CONNTRACK_ESTABLISHED | |
67 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT | |
68 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD | |
69 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT | |
70 | #define sIV SCTP_CONNTRACK_MAX | |
71 | ||
601e68e1 | 72 | /* |
9fb9cbb1 YK |
73 | These are the descriptions of the states: |
74 | ||
601e68e1 | 75 | NOTE: These state names are tantalizingly similar to the states of an |
9fb9cbb1 | 76 | SCTP endpoint. But the interpretation of the states is a little different, |
601e68e1 | 77 | considering that these are the states of the connection and not of an end |
9fb9cbb1 YK |
78 | point. Please note the subtleties. -Kiran |
79 | ||
80 | NONE - Nothing so far. | |
601e68e1 YH |
81 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
82 | an INIT_ACK chunk in the reply direction. | |
9fb9cbb1 YK |
83 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. |
84 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. | |
85 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. | |
86 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. | |
87 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite | |
601e68e1 YH |
88 | to that of the SHUTDOWN chunk. |
89 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of | |
90 | the SHUTDOWN chunk. Connection is closed. | |
9fb9cbb1 YK |
91 | */ |
92 | ||
93 | /* TODO | |
601e68e1 | 94 | - I have assumed that the first INIT is in the original direction. |
9fb9cbb1 YK |
95 | This messes things when an INIT comes in the reply direction in CLOSED |
96 | state. | |
601e68e1 | 97 | - Check the error type in the reply dir before transitioning from |
9fb9cbb1 YK |
98 | cookie echoed to closed. |
99 | - Sec 5.2.4 of RFC 2960 | |
100 | - Multi Homing support. | |
101 | */ | |
102 | ||
103 | /* SCTP conntrack state transitions */ | |
a5e73c29 | 104 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
9fb9cbb1 YK |
105 | { |
106 | /* ORIGINAL */ | |
107 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
108 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA}, | |
109 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
110 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
111 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA}, | |
112 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
113 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/ | |
114 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ | |
115 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */ | |
116 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
117 | }, | |
118 | { | |
119 | /* REPLY */ | |
120 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
121 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */ | |
122 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
123 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
124 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA}, | |
125 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
126 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA}, | |
127 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */ | |
128 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA}, | |
129 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
130 | } | |
131 | }; | |
132 | ||
09f263cd JE |
133 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
134 | struct nf_conntrack_tuple *tuple) | |
9fb9cbb1 | 135 | { |
12c33aa2 JE |
136 | const struct sctphdr *hp; |
137 | struct sctphdr _hdr; | |
9fb9cbb1 | 138 | |
9fb9cbb1 YK |
139 | /* Actually only need first 8 bytes. */ |
140 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
141 | if (hp == NULL) | |
09f263cd | 142 | return false; |
9fb9cbb1 YK |
143 | |
144 | tuple->src.u.sctp.port = hp->source; | |
145 | tuple->dst.u.sctp.port = hp->dest; | |
09f263cd | 146 | return true; |
9fb9cbb1 YK |
147 | } |
148 | ||
09f263cd JE |
149 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
150 | const struct nf_conntrack_tuple *orig) | |
9fb9cbb1 | 151 | { |
9fb9cbb1 YK |
152 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
153 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
09f263cd | 154 | return true; |
9fb9cbb1 YK |
155 | } |
156 | ||
157 | /* Print out the per-protocol part of the tuple. */ | |
158 | static int sctp_print_tuple(struct seq_file *s, | |
159 | const struct nf_conntrack_tuple *tuple) | |
160 | { | |
9fb9cbb1 YK |
161 | return seq_printf(s, "sport=%hu dport=%hu ", |
162 | ntohs(tuple->src.u.sctp.port), | |
163 | ntohs(tuple->dst.u.sctp.port)); | |
164 | } | |
165 | ||
166 | /* Print out the private part of the conntrack. */ | |
112f35c9 | 167 | static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) |
9fb9cbb1 YK |
168 | { |
169 | enum sctp_conntrack state; | |
170 | ||
9fb9cbb1 | 171 | read_lock_bh(&sctp_lock); |
112f35c9 | 172 | state = ct->proto.sctp.state; |
9fb9cbb1 YK |
173 | read_unlock_bh(&sctp_lock); |
174 | ||
175 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); | |
176 | } | |
177 | ||
178 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
e79ec50b JE |
179 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
180 | (offset) < (skb)->len && \ | |
181 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ | |
182 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) | |
9fb9cbb1 YK |
183 | |
184 | /* Some validity checks to make sure the chunks are fine */ | |
112f35c9 | 185 | static int do_basic_checks(struct nf_conn *ct, |
9fb9cbb1 YK |
186 | const struct sk_buff *skb, |
187 | unsigned int dataoff, | |
35c6d3cb | 188 | unsigned long *map) |
9fb9cbb1 YK |
189 | { |
190 | u_int32_t offset, count; | |
191 | sctp_chunkhdr_t _sch, *sch; | |
192 | int flag; | |
193 | ||
9fb9cbb1 YK |
194 | flag = 0; |
195 | ||
196 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
0d53778e | 197 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
9fb9cbb1 | 198 | |
5447d477 PM |
199 | if (sch->type == SCTP_CID_INIT || |
200 | sch->type == SCTP_CID_INIT_ACK || | |
201 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) | |
9fb9cbb1 | 202 | flag = 1; |
9fb9cbb1 | 203 | |
e17df688 PM |
204 | /* |
205 | * Cookie Ack/Echo chunks not the first OR | |
206 | * Init / Init Ack / Shutdown compl chunks not the only chunks | |
207 | * OR zero-length. | |
208 | */ | |
5447d477 PM |
209 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
210 | sch->type == SCTP_CID_COOKIE_ECHO || | |
211 | flag) && | |
212 | count != 0) || !sch->length) { | |
0d53778e | 213 | pr_debug("Basic checks failed\n"); |
9fb9cbb1 YK |
214 | return 1; |
215 | } | |
216 | ||
5447d477 | 217 | if (map) |
35c6d3cb | 218 | set_bit(sch->type, map); |
9fb9cbb1 YK |
219 | } |
220 | ||
0d53778e | 221 | pr_debug("Basic checks passed\n"); |
dd7271fe | 222 | return count == 0; |
9fb9cbb1 YK |
223 | } |
224 | ||
efe9f68a PM |
225 | static int sctp_new_state(enum ip_conntrack_dir dir, |
226 | enum sctp_conntrack cur_state, | |
227 | int chunk_type) | |
9fb9cbb1 YK |
228 | { |
229 | int i; | |
230 | ||
0d53778e | 231 | pr_debug("Chunk type: %d\n", chunk_type); |
9fb9cbb1 YK |
232 | |
233 | switch (chunk_type) { | |
5447d477 PM |
234 | case SCTP_CID_INIT: |
235 | pr_debug("SCTP_CID_INIT\n"); | |
236 | i = 0; | |
237 | break; | |
238 | case SCTP_CID_INIT_ACK: | |
239 | pr_debug("SCTP_CID_INIT_ACK\n"); | |
240 | i = 1; | |
241 | break; | |
242 | case SCTP_CID_ABORT: | |
243 | pr_debug("SCTP_CID_ABORT\n"); | |
244 | i = 2; | |
245 | break; | |
246 | case SCTP_CID_SHUTDOWN: | |
247 | pr_debug("SCTP_CID_SHUTDOWN\n"); | |
248 | i = 3; | |
249 | break; | |
250 | case SCTP_CID_SHUTDOWN_ACK: | |
251 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); | |
252 | i = 4; | |
253 | break; | |
254 | case SCTP_CID_ERROR: | |
255 | pr_debug("SCTP_CID_ERROR\n"); | |
256 | i = 5; | |
257 | break; | |
258 | case SCTP_CID_COOKIE_ECHO: | |
259 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); | |
260 | i = 6; | |
261 | break; | |
262 | case SCTP_CID_COOKIE_ACK: | |
263 | pr_debug("SCTP_CID_COOKIE_ACK\n"); | |
264 | i = 7; | |
265 | break; | |
266 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
267 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
268 | i = 8; | |
269 | break; | |
270 | default: | |
271 | /* Other chunks like DATA, SACK, HEARTBEAT and | |
272 | its ACK do not cause a change in state */ | |
273 | pr_debug("Unknown chunk type, Will stay in %s\n", | |
274 | sctp_conntrack_names[cur_state]); | |
275 | return cur_state; | |
9fb9cbb1 YK |
276 | } |
277 | ||
0d53778e PM |
278 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
279 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
280 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
9fb9cbb1 YK |
281 | |
282 | return sctp_conntracks[dir][i][cur_state]; | |
283 | } | |
284 | ||
b37e933a | 285 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
112f35c9 | 286 | static int sctp_packet(struct nf_conn *ct, |
9fb9cbb1 YK |
287 | const struct sk_buff *skb, |
288 | unsigned int dataoff, | |
289 | enum ip_conntrack_info ctinfo, | |
76108cea | 290 | u_int8_t pf, |
9fb9cbb1 YK |
291 | unsigned int hooknum) |
292 | { | |
efe9f68a | 293 | enum sctp_conntrack new_state, old_state; |
8528819a | 294 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
12c33aa2 JE |
295 | const struct sctphdr *sh; |
296 | struct sctphdr _sctph; | |
297 | const struct sctp_chunkhdr *sch; | |
298 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 299 | u_int32_t offset, count; |
35c6d3cb | 300 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 301 | |
9fb9cbb1 YK |
302 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
303 | if (sh == NULL) | |
b37e933a | 304 | goto out; |
9fb9cbb1 | 305 | |
112f35c9 | 306 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
b37e933a | 307 | goto out; |
9fb9cbb1 YK |
308 | |
309 | /* Check the verification tag (Sec 8.5) */ | |
35c6d3cb PM |
310 | if (!test_bit(SCTP_CID_INIT, map) && |
311 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && | |
312 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && | |
313 | !test_bit(SCTP_CID_ABORT, map) && | |
314 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && | |
8528819a | 315 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
0d53778e | 316 | pr_debug("Verification tag check failed\n"); |
b37e933a | 317 | goto out; |
9fb9cbb1 YK |
318 | } |
319 | ||
efe9f68a | 320 | old_state = new_state = SCTP_CONNTRACK_MAX; |
4a64830a | 321 | write_lock_bh(&sctp_lock); |
9fb9cbb1 | 322 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
9fb9cbb1 YK |
323 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
324 | if (sch->type == SCTP_CID_INIT) { | |
325 | /* Sec 8.5.1 (A) */ | |
b37e933a PM |
326 | if (sh->vtag != 0) |
327 | goto out_unlock; | |
9fb9cbb1 YK |
328 | } else if (sch->type == SCTP_CID_ABORT) { |
329 | /* Sec 8.5.1 (B) */ | |
8528819a | 330 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
b37e933a PM |
331 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
332 | goto out_unlock; | |
9fb9cbb1 YK |
333 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
334 | /* Sec 8.5.1 (C) */ | |
8528819a PM |
335 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
336 | sh->vtag != ct->proto.sctp.vtag[!dir] && | |
9b1c2cfd | 337 | sch->flags & SCTP_CHUNK_FLAG_T) |
b37e933a | 338 | goto out_unlock; |
9fb9cbb1 YK |
339 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
340 | /* Sec 8.5.1 (D) */ | |
b37e933a PM |
341 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
342 | goto out_unlock; | |
9fb9cbb1 YK |
343 | } |
344 | ||
efe9f68a PM |
345 | old_state = ct->proto.sctp.state; |
346 | new_state = sctp_new_state(dir, old_state, sch->type); | |
9fb9cbb1 YK |
347 | |
348 | /* Invalid */ | |
efe9f68a | 349 | if (new_state == SCTP_CONNTRACK_MAX) { |
0d53778e PM |
350 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
351 | "conntrack=%u\n", | |
efe9f68a | 352 | dir, sch->type, old_state); |
b37e933a | 353 | goto out_unlock; |
9fb9cbb1 YK |
354 | } |
355 | ||
356 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
5447d477 PM |
357 | if (sch->type == SCTP_CID_INIT || |
358 | sch->type == SCTP_CID_INIT_ACK) { | |
9fb9cbb1 YK |
359 | sctp_inithdr_t _inithdr, *ih; |
360 | ||
361 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 362 | sizeof(_inithdr), &_inithdr); |
b37e933a PM |
363 | if (ih == NULL) |
364 | goto out_unlock; | |
0d53778e | 365 | pr_debug("Setting vtag %x for dir %d\n", |
8528819a PM |
366 | ih->init_tag, !dir); |
367 | ct->proto.sctp.vtag[!dir] = ih->init_tag; | |
9fb9cbb1 YK |
368 | } |
369 | ||
efe9f68a PM |
370 | ct->proto.sctp.state = new_state; |
371 | if (old_state != new_state) | |
a71996fc | 372 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
9fb9cbb1 | 373 | } |
4a64830a | 374 | write_unlock_bh(&sctp_lock); |
9fb9cbb1 | 375 | |
86c0bf40 | 376 | nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]); |
9fb9cbb1 | 377 | |
efe9f68a | 378 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
8528819a | 379 | dir == IP_CT_DIR_REPLY && |
efe9f68a | 380 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
0d53778e | 381 | pr_debug("Setting assured bit\n"); |
112f35c9 | 382 | set_bit(IPS_ASSURED_BIT, &ct->status); |
a71996fc | 383 | nf_conntrack_event_cache(IPCT_STATUS, ct); |
9fb9cbb1 YK |
384 | } |
385 | ||
386 | return NF_ACCEPT; | |
b37e933a PM |
387 | |
388 | out_unlock: | |
389 | write_unlock_bh(&sctp_lock); | |
390 | out: | |
391 | return -NF_ACCEPT; | |
9fb9cbb1 YK |
392 | } |
393 | ||
394 | /* Called when a new connection for this protocol found. */ | |
09f263cd JE |
395 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
396 | unsigned int dataoff) | |
9fb9cbb1 | 397 | { |
efe9f68a | 398 | enum sctp_conntrack new_state; |
12c33aa2 JE |
399 | const struct sctphdr *sh; |
400 | struct sctphdr _sctph; | |
401 | const struct sctp_chunkhdr *sch; | |
402 | struct sctp_chunkhdr _sch; | |
9fb9cbb1 | 403 | u_int32_t offset, count; |
35c6d3cb | 404 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
9fb9cbb1 | 405 | |
9fb9cbb1 YK |
406 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
407 | if (sh == NULL) | |
09f263cd | 408 | return false; |
9fb9cbb1 | 409 | |
112f35c9 | 410 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
09f263cd | 411 | return false; |
9fb9cbb1 YK |
412 | |
413 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
35c6d3cb PM |
414 | if (test_bit(SCTP_CID_ABORT, map) || |
415 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || | |
416 | test_bit(SCTP_CID_COOKIE_ACK, map)) | |
09f263cd | 417 | return false; |
9fb9cbb1 | 418 | |
efe9f68a | 419 | new_state = SCTP_CONNTRACK_MAX; |
9fb9cbb1 YK |
420 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
421 | /* Don't need lock here: this conntrack not in circulation yet */ | |
efe9f68a PM |
422 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
423 | SCTP_CONNTRACK_NONE, sch->type); | |
9fb9cbb1 YK |
424 | |
425 | /* Invalid: delete conntrack */ | |
efe9f68a PM |
426 | if (new_state == SCTP_CONNTRACK_NONE || |
427 | new_state == SCTP_CONNTRACK_MAX) { | |
0d53778e | 428 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
09f263cd | 429 | return false; |
9fb9cbb1 YK |
430 | } |
431 | ||
432 | /* Copy the vtag into the state info */ | |
433 | if (sch->type == SCTP_CID_INIT) { | |
434 | if (sh->vtag == 0) { | |
435 | sctp_inithdr_t _inithdr, *ih; | |
436 | ||
437 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
601e68e1 | 438 | sizeof(_inithdr), &_inithdr); |
9fb9cbb1 | 439 | if (ih == NULL) |
09f263cd | 440 | return false; |
9fb9cbb1 | 441 | |
0d53778e PM |
442 | pr_debug("Setting vtag %x for new conn\n", |
443 | ih->init_tag); | |
9fb9cbb1 | 444 | |
112f35c9 | 445 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
9fb9cbb1 YK |
446 | ih->init_tag; |
447 | } else { | |
448 | /* Sec 8.5.1 (A) */ | |
09f263cd | 449 | return false; |
9fb9cbb1 YK |
450 | } |
451 | } | |
452 | /* If it is a shutdown ack OOTB packet, we expect a return | |
453 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
454 | else { | |
0d53778e PM |
455 | pr_debug("Setting vtag %x for new conn OOTB\n", |
456 | sh->vtag); | |
112f35c9 | 457 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
9fb9cbb1 YK |
458 | } |
459 | ||
efe9f68a | 460 | ct->proto.sctp.state = new_state; |
9fb9cbb1 YK |
461 | } |
462 | ||
09f263cd | 463 | return true; |
9fb9cbb1 YK |
464 | } |
465 | ||
a258860e PNA |
466 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
467 | ||
468 | #include <linux/netfilter/nfnetlink.h> | |
469 | #include <linux/netfilter/nfnetlink_conntrack.h> | |
470 | ||
471 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, | |
472 | const struct nf_conn *ct) | |
473 | { | |
474 | struct nlattr *nest_parms; | |
475 | ||
476 | read_lock_bh(&sctp_lock); | |
477 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); | |
478 | if (!nest_parms) | |
479 | goto nla_put_failure; | |
480 | ||
481 | NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state); | |
482 | ||
483 | NLA_PUT_BE32(skb, | |
484 | CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, | |
5547cd0a | 485 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]); |
a258860e PNA |
486 | |
487 | NLA_PUT_BE32(skb, | |
488 | CTA_PROTOINFO_SCTP_VTAG_REPLY, | |
5547cd0a | 489 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY]); |
a258860e PNA |
490 | |
491 | read_unlock_bh(&sctp_lock); | |
492 | ||
493 | nla_nest_end(skb, nest_parms); | |
494 | ||
495 | return 0; | |
496 | ||
497 | nla_put_failure: | |
498 | read_unlock_bh(&sctp_lock); | |
499 | return -1; | |
500 | } | |
501 | ||
502 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { | |
503 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, | |
504 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, | |
505 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, | |
506 | }; | |
507 | ||
508 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) | |
509 | { | |
510 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; | |
511 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; | |
512 | int err; | |
513 | ||
514 | /* updates may not contain the internal protocol info, skip parsing */ | |
515 | if (!attr) | |
516 | return 0; | |
517 | ||
518 | err = nla_parse_nested(tb, | |
519 | CTA_PROTOINFO_SCTP_MAX, | |
520 | attr, | |
521 | sctp_nla_policy); | |
522 | if (err < 0) | |
523 | return err; | |
524 | ||
525 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || | |
526 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || | |
527 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) | |
528 | return -EINVAL; | |
529 | ||
530 | write_lock_bh(&sctp_lock); | |
531 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); | |
532 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = | |
5547cd0a | 533 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
a258860e | 534 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
5547cd0a | 535 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
a258860e PNA |
536 | write_unlock_bh(&sctp_lock); |
537 | ||
538 | return 0; | |
539 | } | |
540 | #endif | |
541 | ||
9fb9cbb1 | 542 | #ifdef CONFIG_SYSCTL |
933a41e7 PM |
543 | static unsigned int sctp_sysctl_table_users; |
544 | static struct ctl_table_header *sctp_sysctl_header; | |
545 | static struct ctl_table sctp_sysctl_table[] = { | |
9fb9cbb1 | 546 | { |
9fb9cbb1 | 547 | .procname = "nf_conntrack_sctp_timeout_closed", |
86c0bf40 | 548 | .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], |
9fb9cbb1 YK |
549 | .maxlen = sizeof(unsigned int), |
550 | .mode = 0644, | |
6d9f239a | 551 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
552 | }, |
553 | { | |
9fb9cbb1 | 554 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
86c0bf40 | 555 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], |
9fb9cbb1 YK |
556 | .maxlen = sizeof(unsigned int), |
557 | .mode = 0644, | |
6d9f239a | 558 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
559 | }, |
560 | { | |
9fb9cbb1 | 561 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
86c0bf40 | 562 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], |
9fb9cbb1 YK |
563 | .maxlen = sizeof(unsigned int), |
564 | .mode = 0644, | |
6d9f239a | 565 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
566 | }, |
567 | { | |
9fb9cbb1 | 568 | .procname = "nf_conntrack_sctp_timeout_established", |
86c0bf40 | 569 | .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], |
9fb9cbb1 YK |
570 | .maxlen = sizeof(unsigned int), |
571 | .mode = 0644, | |
6d9f239a | 572 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
573 | }, |
574 | { | |
9fb9cbb1 | 575 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
86c0bf40 | 576 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], |
9fb9cbb1 YK |
577 | .maxlen = sizeof(unsigned int), |
578 | .mode = 0644, | |
6d9f239a | 579 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
580 | }, |
581 | { | |
9fb9cbb1 | 582 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
86c0bf40 | 583 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], |
9fb9cbb1 YK |
584 | .maxlen = sizeof(unsigned int), |
585 | .mode = 0644, | |
6d9f239a | 586 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 YK |
587 | }, |
588 | { | |
9fb9cbb1 | 589 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
86c0bf40 | 590 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], |
9fb9cbb1 YK |
591 | .maxlen = sizeof(unsigned int), |
592 | .mode = 0644, | |
6d9f239a | 593 | .proc_handler = proc_dointvec_jiffies, |
9fb9cbb1 | 594 | }, |
9fb9cbb1 | 595 | { |
933a41e7 PM |
596 | .ctl_name = 0 |
597 | } | |
9fb9cbb1 | 598 | }; |
a999e683 PM |
599 | |
600 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT | |
601 | static struct ctl_table sctp_compat_sysctl_table[] = { | |
602 | { | |
a999e683 | 603 | .procname = "ip_conntrack_sctp_timeout_closed", |
86c0bf40 | 604 | .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], |
a999e683 PM |
605 | .maxlen = sizeof(unsigned int), |
606 | .mode = 0644, | |
6d9f239a | 607 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
608 | }, |
609 | { | |
a999e683 | 610 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
86c0bf40 | 611 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], |
a999e683 PM |
612 | .maxlen = sizeof(unsigned int), |
613 | .mode = 0644, | |
6d9f239a | 614 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
615 | }, |
616 | { | |
a999e683 | 617 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
86c0bf40 | 618 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], |
a999e683 PM |
619 | .maxlen = sizeof(unsigned int), |
620 | .mode = 0644, | |
6d9f239a | 621 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
622 | }, |
623 | { | |
a999e683 | 624 | .procname = "ip_conntrack_sctp_timeout_established", |
86c0bf40 | 625 | .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], |
a999e683 PM |
626 | .maxlen = sizeof(unsigned int), |
627 | .mode = 0644, | |
6d9f239a | 628 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
629 | }, |
630 | { | |
a999e683 | 631 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
86c0bf40 | 632 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], |
a999e683 PM |
633 | .maxlen = sizeof(unsigned int), |
634 | .mode = 0644, | |
6d9f239a | 635 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
636 | }, |
637 | { | |
a999e683 | 638 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
86c0bf40 | 639 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], |
a999e683 PM |
640 | .maxlen = sizeof(unsigned int), |
641 | .mode = 0644, | |
6d9f239a | 642 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
643 | }, |
644 | { | |
a999e683 | 645 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
86c0bf40 | 646 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], |
a999e683 PM |
647 | .maxlen = sizeof(unsigned int), |
648 | .mode = 0644, | |
6d9f239a | 649 | .proc_handler = proc_dointvec_jiffies, |
a999e683 PM |
650 | }, |
651 | { | |
652 | .ctl_name = 0 | |
653 | } | |
654 | }; | |
655 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ | |
933a41e7 | 656 | #endif |
9fb9cbb1 | 657 | |
61075af5 | 658 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
933a41e7 PM |
659 | .l3proto = PF_INET, |
660 | .l4proto = IPPROTO_SCTP, | |
661 | .name = "sctp", | |
662 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
663 | .invert_tuple = sctp_invert_tuple, | |
664 | .print_tuple = sctp_print_tuple, | |
665 | .print_conntrack = sctp_print_conntrack, | |
666 | .packet = sctp_packet, | |
667 | .new = sctp_new, | |
668 | .me = THIS_MODULE, | |
c7212e9d | 669 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
a258860e PNA |
670 | .to_nlattr = sctp_to_nlattr, |
671 | .from_nlattr = nlattr_to_sctp, | |
c7212e9d PNA |
672 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
673 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
674 | .nla_policy = nf_ct_port_nla_policy, | |
675 | #endif | |
933a41e7 PM |
676 | #ifdef CONFIG_SYSCTL |
677 | .ctl_table_users = &sctp_sysctl_table_users, | |
678 | .ctl_table_header = &sctp_sysctl_header, | |
679 | .ctl_table = sctp_sysctl_table, | |
a999e683 PM |
680 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
681 | .ctl_compat_table = sctp_compat_sysctl_table, | |
682 | #endif | |
933a41e7 | 683 | #endif |
9fb9cbb1 YK |
684 | }; |
685 | ||
61075af5 | 686 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
933a41e7 PM |
687 | .l3proto = PF_INET6, |
688 | .l4proto = IPPROTO_SCTP, | |
689 | .name = "sctp", | |
690 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
691 | .invert_tuple = sctp_invert_tuple, | |
692 | .print_tuple = sctp_print_tuple, | |
693 | .print_conntrack = sctp_print_conntrack, | |
694 | .packet = sctp_packet, | |
695 | .new = sctp_new, | |
696 | .me = THIS_MODULE, | |
c7212e9d | 697 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
a258860e PNA |
698 | .to_nlattr = sctp_to_nlattr, |
699 | .from_nlattr = nlattr_to_sctp, | |
c7212e9d PNA |
700 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
701 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, | |
702 | .nla_policy = nf_ct_port_nla_policy, | |
703 | #endif | |
933a41e7 PM |
704 | #ifdef CONFIG_SYSCTL |
705 | .ctl_table_users = &sctp_sysctl_table_users, | |
706 | .ctl_table_header = &sctp_sysctl_header, | |
707 | .ctl_table = sctp_sysctl_table, | |
9fb9cbb1 | 708 | #endif |
933a41e7 | 709 | }; |
9fb9cbb1 | 710 | |
2f0d2f10 | 711 | static int __init nf_conntrack_proto_sctp_init(void) |
9fb9cbb1 YK |
712 | { |
713 | int ret; | |
714 | ||
605dcad6 | 715 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4); |
9fb9cbb1 | 716 | if (ret) { |
605dcad6 | 717 | printk("nf_conntrack_l4proto_sctp4: protocol register failed\n"); |
9fb9cbb1 YK |
718 | goto out; |
719 | } | |
605dcad6 | 720 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6); |
9fb9cbb1 | 721 | if (ret) { |
605dcad6 | 722 | printk("nf_conntrack_l4proto_sctp6: protocol register failed\n"); |
9fb9cbb1 YK |
723 | goto cleanup_sctp4; |
724 | } | |
725 | ||
9fb9cbb1 YK |
726 | return ret; |
727 | ||
9fb9cbb1 | 728 | cleanup_sctp4: |
605dcad6 | 729 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
9fb9cbb1 | 730 | out: |
9fb9cbb1 YK |
731 | return ret; |
732 | } | |
733 | ||
2f0d2f10 | 734 | static void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 | 735 | { |
605dcad6 MJ |
736 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
737 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); | |
9fb9cbb1 YK |
738 | } |
739 | ||
65b4b4e8 AM |
740 | module_init(nf_conntrack_proto_sctp_init); |
741 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
742 | |
743 | MODULE_LICENSE("GPL"); | |
744 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
745 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); | |
d2483dde | 746 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |