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9fb9cbb1 YK |
1 | /* |
2 | * Connection tracking protocol helper module for SCTP. | |
3 | * | |
4 | * SCTP is defined in RFC 2960. References to various sections in this code | |
5 | * are to this RFC. | |
6 | * | |
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. | |
10 | * | |
11 | * 17 Oct 2004: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
12 | * - enable working with L3 protocol independent connection tracking. | |
13 | * | |
14 | * Derived from net/ipv4/ip_conntrack_sctp.c | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Added support for proc manipulation of timeouts. | |
19 | */ | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/timer.h> | |
24 | #include <linux/netfilter.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/ip.h> | |
28 | #include <linux/sctp.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/seq_file.h> | |
31 | ||
32 | #include <net/netfilter/nf_conntrack.h> | |
33 | #include <net/netfilter/nf_conntrack_protocol.h> | |
34 | ||
35 | #if 0 | |
36 | #define DEBUGP(format, ...) printk(format, ## __VA_ARGS__) | |
37 | #else | |
38 | #define DEBUGP(format, args...) | |
39 | #endif | |
40 | ||
41 | /* Protects conntrack->proto.sctp */ | |
42 | static DEFINE_RWLOCK(sctp_lock); | |
43 | ||
44 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more | |
45 | closely. They're more complex. --RR | |
46 | ||
47 | And so for me for SCTP :D -Kiran */ | |
48 | ||
49 | static const char *sctp_conntrack_names[] = { | |
50 | "NONE", | |
51 | "CLOSED", | |
52 | "COOKIE_WAIT", | |
53 | "COOKIE_ECHOED", | |
54 | "ESTABLISHED", | |
55 | "SHUTDOWN_SENT", | |
56 | "SHUTDOWN_RECD", | |
57 | "SHUTDOWN_ACK_SENT", | |
58 | }; | |
59 | ||
60 | #define SECS * HZ | |
61 | #define MINS * 60 SECS | |
62 | #define HOURS * 60 MINS | |
63 | #define DAYS * 24 HOURS | |
64 | ||
babbdb1a PM |
65 | static unsigned int nf_ct_sctp_timeout_closed = 10 SECS; |
66 | static unsigned int nf_ct_sctp_timeout_cookie_wait = 3 SECS; | |
67 | static unsigned int nf_ct_sctp_timeout_cookie_echoed = 3 SECS; | |
68 | static unsigned int nf_ct_sctp_timeout_established = 5 DAYS; | |
69 | static unsigned int nf_ct_sctp_timeout_shutdown_sent = 300 SECS / 1000; | |
70 | static unsigned int nf_ct_sctp_timeout_shutdown_recd = 300 SECS / 1000; | |
71 | static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent = 3 SECS; | |
9fb9cbb1 | 72 | |
babbdb1a | 73 | static unsigned int * sctp_timeouts[] |
9fb9cbb1 YK |
74 | = { NULL, /* SCTP_CONNTRACK_NONE */ |
75 | &nf_ct_sctp_timeout_closed, /* SCTP_CONNTRACK_CLOSED */ | |
76 | &nf_ct_sctp_timeout_cookie_wait, /* SCTP_CONNTRACK_COOKIE_WAIT */ | |
77 | &nf_ct_sctp_timeout_cookie_echoed, /* SCTP_CONNTRACK_COOKIE_ECHOED */ | |
78 | &nf_ct_sctp_timeout_established, /* SCTP_CONNTRACK_ESTABLISHED */ | |
79 | &nf_ct_sctp_timeout_shutdown_sent, /* SCTP_CONNTRACK_SHUTDOWN_SENT */ | |
80 | &nf_ct_sctp_timeout_shutdown_recd, /* SCTP_CONNTRACK_SHUTDOWN_RECD */ | |
81 | &nf_ct_sctp_timeout_shutdown_ack_sent /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */ | |
82 | }; | |
83 | ||
84 | #define sNO SCTP_CONNTRACK_NONE | |
85 | #define sCL SCTP_CONNTRACK_CLOSED | |
86 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT | |
87 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED | |
88 | #define sES SCTP_CONNTRACK_ESTABLISHED | |
89 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT | |
90 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD | |
91 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT | |
92 | #define sIV SCTP_CONNTRACK_MAX | |
93 | ||
94 | /* | |
95 | These are the descriptions of the states: | |
96 | ||
97 | NOTE: These state names are tantalizingly similar to the states of an | |
98 | SCTP endpoint. But the interpretation of the states is a little different, | |
99 | considering that these are the states of the connection and not of an end | |
100 | point. Please note the subtleties. -Kiran | |
101 | ||
102 | NONE - Nothing so far. | |
103 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also | |
104 | an INIT_ACK chunk in the reply direction. | |
105 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. | |
106 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. | |
107 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. | |
108 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. | |
109 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite | |
110 | to that of the SHUTDOWN chunk. | |
111 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of | |
112 | the SHUTDOWN chunk. Connection is closed. | |
113 | */ | |
114 | ||
115 | /* TODO | |
116 | - I have assumed that the first INIT is in the original direction. | |
117 | This messes things when an INIT comes in the reply direction in CLOSED | |
118 | state. | |
119 | - Check the error type in the reply dir before transitioning from | |
120 | cookie echoed to closed. | |
121 | - Sec 5.2.4 of RFC 2960 | |
122 | - Multi Homing support. | |
123 | */ | |
124 | ||
125 | /* SCTP conntrack state transitions */ | |
126 | static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { | |
127 | { | |
128 | /* ORIGINAL */ | |
129 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
130 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA}, | |
131 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
132 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
133 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA}, | |
134 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
135 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/ | |
136 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ | |
137 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */ | |
138 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
139 | }, | |
140 | { | |
141 | /* REPLY */ | |
142 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ | |
143 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */ | |
144 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA}, | |
145 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, | |
146 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA}, | |
147 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA}, | |
148 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA}, | |
149 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */ | |
150 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA}, | |
151 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL} | |
152 | } | |
153 | }; | |
154 | ||
155 | static int sctp_pkt_to_tuple(const struct sk_buff *skb, | |
156 | unsigned int dataoff, | |
157 | struct nf_conntrack_tuple *tuple) | |
158 | { | |
159 | sctp_sctphdr_t _hdr, *hp; | |
160 | ||
161 | DEBUGP(__FUNCTION__); | |
162 | DEBUGP("\n"); | |
163 | ||
164 | /* Actually only need first 8 bytes. */ | |
165 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); | |
166 | if (hp == NULL) | |
167 | return 0; | |
168 | ||
169 | tuple->src.u.sctp.port = hp->source; | |
170 | tuple->dst.u.sctp.port = hp->dest; | |
171 | return 1; | |
172 | } | |
173 | ||
174 | static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple, | |
175 | const struct nf_conntrack_tuple *orig) | |
176 | { | |
177 | DEBUGP(__FUNCTION__); | |
178 | DEBUGP("\n"); | |
179 | ||
180 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; | |
181 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; | |
182 | return 1; | |
183 | } | |
184 | ||
185 | /* Print out the per-protocol part of the tuple. */ | |
186 | static int sctp_print_tuple(struct seq_file *s, | |
187 | const struct nf_conntrack_tuple *tuple) | |
188 | { | |
189 | DEBUGP(__FUNCTION__); | |
190 | DEBUGP("\n"); | |
191 | ||
192 | return seq_printf(s, "sport=%hu dport=%hu ", | |
193 | ntohs(tuple->src.u.sctp.port), | |
194 | ntohs(tuple->dst.u.sctp.port)); | |
195 | } | |
196 | ||
197 | /* Print out the private part of the conntrack. */ | |
198 | static int sctp_print_conntrack(struct seq_file *s, | |
199 | const struct nf_conn *conntrack) | |
200 | { | |
201 | enum sctp_conntrack state; | |
202 | ||
203 | DEBUGP(__FUNCTION__); | |
204 | DEBUGP("\n"); | |
205 | ||
206 | read_lock_bh(&sctp_lock); | |
207 | state = conntrack->proto.sctp.state; | |
208 | read_unlock_bh(&sctp_lock); | |
209 | ||
210 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); | |
211 | } | |
212 | ||
213 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ | |
214 | for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0; \ | |
215 | offset < skb->len && \ | |
216 | (sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch)); \ | |
217 | offset += (htons(sch->length) + 3) & ~3, count++) | |
218 | ||
219 | /* Some validity checks to make sure the chunks are fine */ | |
220 | static int do_basic_checks(struct nf_conn *conntrack, | |
221 | const struct sk_buff *skb, | |
222 | unsigned int dataoff, | |
223 | char *map) | |
224 | { | |
225 | u_int32_t offset, count; | |
226 | sctp_chunkhdr_t _sch, *sch; | |
227 | int flag; | |
228 | ||
229 | DEBUGP(__FUNCTION__); | |
230 | DEBUGP("\n"); | |
231 | ||
232 | flag = 0; | |
233 | ||
234 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
235 | DEBUGP("Chunk Num: %d Type: %d\n", count, sch->type); | |
236 | ||
237 | if (sch->type == SCTP_CID_INIT | |
238 | || sch->type == SCTP_CID_INIT_ACK | |
239 | || sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { | |
240 | flag = 1; | |
241 | } | |
242 | ||
243 | /* Cookie Ack/Echo chunks not the first OR | |
244 | Init / Init Ack / Shutdown compl chunks not the only chunks */ | |
245 | if ((sch->type == SCTP_CID_COOKIE_ACK | |
246 | || sch->type == SCTP_CID_COOKIE_ECHO | |
247 | || flag) | |
248 | && count !=0 ) { | |
249 | DEBUGP("Basic checks failed\n"); | |
250 | return 1; | |
251 | } | |
252 | ||
253 | if (map) { | |
254 | set_bit(sch->type, (void *)map); | |
255 | } | |
256 | } | |
257 | ||
258 | DEBUGP("Basic checks passed\n"); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int new_state(enum ip_conntrack_dir dir, | |
263 | enum sctp_conntrack cur_state, | |
264 | int chunk_type) | |
265 | { | |
266 | int i; | |
267 | ||
268 | DEBUGP(__FUNCTION__); | |
269 | DEBUGP("\n"); | |
270 | ||
271 | DEBUGP("Chunk type: %d\n", chunk_type); | |
272 | ||
273 | switch (chunk_type) { | |
274 | case SCTP_CID_INIT: | |
275 | DEBUGP("SCTP_CID_INIT\n"); | |
276 | i = 0; break; | |
277 | case SCTP_CID_INIT_ACK: | |
278 | DEBUGP("SCTP_CID_INIT_ACK\n"); | |
279 | i = 1; break; | |
280 | case SCTP_CID_ABORT: | |
281 | DEBUGP("SCTP_CID_ABORT\n"); | |
282 | i = 2; break; | |
283 | case SCTP_CID_SHUTDOWN: | |
284 | DEBUGP("SCTP_CID_SHUTDOWN\n"); | |
285 | i = 3; break; | |
286 | case SCTP_CID_SHUTDOWN_ACK: | |
287 | DEBUGP("SCTP_CID_SHUTDOWN_ACK\n"); | |
288 | i = 4; break; | |
289 | case SCTP_CID_ERROR: | |
290 | DEBUGP("SCTP_CID_ERROR\n"); | |
291 | i = 5; break; | |
292 | case SCTP_CID_COOKIE_ECHO: | |
293 | DEBUGP("SCTP_CID_COOKIE_ECHO\n"); | |
294 | i = 6; break; | |
295 | case SCTP_CID_COOKIE_ACK: | |
296 | DEBUGP("SCTP_CID_COOKIE_ACK\n"); | |
297 | i = 7; break; | |
298 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
299 | DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n"); | |
300 | i = 8; break; | |
301 | default: | |
302 | /* Other chunks like DATA, SACK, HEARTBEAT and | |
303 | its ACK do not cause a change in state */ | |
304 | DEBUGP("Unknown chunk type, Will stay in %s\n", | |
305 | sctp_conntrack_names[cur_state]); | |
306 | return cur_state; | |
307 | } | |
308 | ||
309 | DEBUGP("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", | |
310 | dir, sctp_conntrack_names[cur_state], chunk_type, | |
311 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); | |
312 | ||
313 | return sctp_conntracks[dir][i][cur_state]; | |
314 | } | |
315 | ||
316 | /* Returns verdict for packet, or -1 for invalid. */ | |
317 | static int sctp_packet(struct nf_conn *conntrack, | |
318 | const struct sk_buff *skb, | |
319 | unsigned int dataoff, | |
320 | enum ip_conntrack_info ctinfo, | |
321 | int pf, | |
322 | unsigned int hooknum) | |
323 | { | |
324 | enum sctp_conntrack newconntrack, oldsctpstate; | |
325 | sctp_sctphdr_t _sctph, *sh; | |
326 | sctp_chunkhdr_t _sch, *sch; | |
327 | u_int32_t offset, count; | |
328 | char map[256 / sizeof (char)] = {0}; | |
329 | ||
330 | DEBUGP(__FUNCTION__); | |
331 | DEBUGP("\n"); | |
332 | ||
333 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); | |
334 | if (sh == NULL) | |
335 | return -1; | |
336 | ||
337 | if (do_basic_checks(conntrack, skb, dataoff, map) != 0) | |
338 | return -1; | |
339 | ||
340 | /* Check the verification tag (Sec 8.5) */ | |
341 | if (!test_bit(SCTP_CID_INIT, (void *)map) | |
342 | && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map) | |
343 | && !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map) | |
344 | && !test_bit(SCTP_CID_ABORT, (void *)map) | |
345 | && !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map) | |
346 | && (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) { | |
347 | DEBUGP("Verification tag check failed\n"); | |
348 | return -1; | |
349 | } | |
350 | ||
351 | oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX; | |
352 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
353 | write_lock_bh(&sctp_lock); | |
354 | ||
355 | /* Special cases of Verification tag check (Sec 8.5.1) */ | |
356 | if (sch->type == SCTP_CID_INIT) { | |
357 | /* Sec 8.5.1 (A) */ | |
358 | if (sh->vtag != 0) { | |
359 | write_unlock_bh(&sctp_lock); | |
360 | return -1; | |
361 | } | |
362 | } else if (sch->type == SCTP_CID_ABORT) { | |
363 | /* Sec 8.5.1 (B) */ | |
364 | if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) | |
365 | && !(sh->vtag == conntrack->proto.sctp.vtag | |
366 | [1 - CTINFO2DIR(ctinfo)])) { | |
367 | write_unlock_bh(&sctp_lock); | |
368 | return -1; | |
369 | } | |
370 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { | |
371 | /* Sec 8.5.1 (C) */ | |
372 | if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)]) | |
373 | && !(sh->vtag == conntrack->proto.sctp.vtag | |
374 | [1 - CTINFO2DIR(ctinfo)] | |
375 | && (sch->flags & 1))) { | |
376 | write_unlock_bh(&sctp_lock); | |
377 | return -1; | |
378 | } | |
379 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { | |
380 | /* Sec 8.5.1 (D) */ | |
381 | if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) { | |
382 | write_unlock_bh(&sctp_lock); | |
383 | return -1; | |
384 | } | |
385 | } | |
386 | ||
387 | oldsctpstate = conntrack->proto.sctp.state; | |
388 | newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type); | |
389 | ||
390 | /* Invalid */ | |
391 | if (newconntrack == SCTP_CONNTRACK_MAX) { | |
392 | DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n", | |
393 | CTINFO2DIR(ctinfo), sch->type, oldsctpstate); | |
394 | write_unlock_bh(&sctp_lock); | |
395 | return -1; | |
396 | } | |
397 | ||
398 | /* If it is an INIT or an INIT ACK note down the vtag */ | |
399 | if (sch->type == SCTP_CID_INIT | |
400 | || sch->type == SCTP_CID_INIT_ACK) { | |
401 | sctp_inithdr_t _inithdr, *ih; | |
402 | ||
403 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
404 | sizeof(_inithdr), &_inithdr); | |
405 | if (ih == NULL) { | |
406 | write_unlock_bh(&sctp_lock); | |
407 | return -1; | |
408 | } | |
409 | DEBUGP("Setting vtag %x for dir %d\n", | |
410 | ih->init_tag, !CTINFO2DIR(ctinfo)); | |
411 | conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag; | |
412 | } | |
413 | ||
414 | conntrack->proto.sctp.state = newconntrack; | |
415 | if (oldsctpstate != newconntrack) | |
416 | nf_conntrack_event_cache(IPCT_PROTOINFO, skb); | |
417 | write_unlock_bh(&sctp_lock); | |
418 | } | |
419 | ||
420 | nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]); | |
421 | ||
422 | if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED | |
423 | && CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY | |
424 | && newconntrack == SCTP_CONNTRACK_ESTABLISHED) { | |
425 | DEBUGP("Setting assured bit\n"); | |
426 | set_bit(IPS_ASSURED_BIT, &conntrack->status); | |
427 | nf_conntrack_event_cache(IPCT_STATUS, skb); | |
428 | } | |
429 | ||
430 | return NF_ACCEPT; | |
431 | } | |
432 | ||
433 | /* Called when a new connection for this protocol found. */ | |
434 | static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb, | |
435 | unsigned int dataoff) | |
436 | { | |
437 | enum sctp_conntrack newconntrack; | |
438 | sctp_sctphdr_t _sctph, *sh; | |
439 | sctp_chunkhdr_t _sch, *sch; | |
440 | u_int32_t offset, count; | |
441 | char map[256 / sizeof (char)] = {0}; | |
442 | ||
443 | DEBUGP(__FUNCTION__); | |
444 | DEBUGP("\n"); | |
445 | ||
446 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); | |
447 | if (sh == NULL) | |
448 | return 0; | |
449 | ||
450 | if (do_basic_checks(conntrack, skb, dataoff, map) != 0) | |
451 | return 0; | |
452 | ||
453 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ | |
454 | if ((test_bit (SCTP_CID_ABORT, (void *)map)) | |
455 | || (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)) | |
456 | || (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) { | |
457 | return 0; | |
458 | } | |
459 | ||
460 | newconntrack = SCTP_CONNTRACK_MAX; | |
461 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { | |
462 | /* Don't need lock here: this conntrack not in circulation yet */ | |
463 | newconntrack = new_state(IP_CT_DIR_ORIGINAL, | |
464 | SCTP_CONNTRACK_NONE, sch->type); | |
465 | ||
466 | /* Invalid: delete conntrack */ | |
467 | if (newconntrack == SCTP_CONNTRACK_MAX) { | |
468 | DEBUGP("nf_conntrack_sctp: invalid new deleting.\n"); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | /* Copy the vtag into the state info */ | |
473 | if (sch->type == SCTP_CID_INIT) { | |
474 | if (sh->vtag == 0) { | |
475 | sctp_inithdr_t _inithdr, *ih; | |
476 | ||
477 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), | |
478 | sizeof(_inithdr), &_inithdr); | |
479 | if (ih == NULL) | |
480 | return 0; | |
481 | ||
482 | DEBUGP("Setting vtag %x for new conn\n", | |
483 | ih->init_tag); | |
484 | ||
485 | conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = | |
486 | ih->init_tag; | |
487 | } else { | |
488 | /* Sec 8.5.1 (A) */ | |
489 | return 0; | |
490 | } | |
491 | } | |
492 | /* If it is a shutdown ack OOTB packet, we expect a return | |
493 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ | |
494 | else { | |
495 | DEBUGP("Setting vtag %x for new conn OOTB\n", | |
496 | sh->vtag); | |
497 | conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; | |
498 | } | |
499 | ||
500 | conntrack->proto.sctp.state = newconntrack; | |
501 | } | |
502 | ||
503 | return 1; | |
504 | } | |
505 | ||
506 | struct nf_conntrack_protocol nf_conntrack_protocol_sctp4 = { | |
507 | .l3proto = PF_INET, | |
508 | .proto = IPPROTO_SCTP, | |
509 | .name = "sctp", | |
510 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
511 | .invert_tuple = sctp_invert_tuple, | |
512 | .print_tuple = sctp_print_tuple, | |
513 | .print_conntrack = sctp_print_conntrack, | |
514 | .packet = sctp_packet, | |
515 | .new = sctp_new, | |
516 | .destroy = NULL, | |
517 | .me = THIS_MODULE | |
518 | }; | |
519 | ||
520 | struct nf_conntrack_protocol nf_conntrack_protocol_sctp6 = { | |
521 | .l3proto = PF_INET6, | |
522 | .proto = IPPROTO_SCTP, | |
523 | .name = "sctp", | |
524 | .pkt_to_tuple = sctp_pkt_to_tuple, | |
525 | .invert_tuple = sctp_invert_tuple, | |
526 | .print_tuple = sctp_print_tuple, | |
527 | .print_conntrack = sctp_print_conntrack, | |
528 | .packet = sctp_packet, | |
529 | .new = sctp_new, | |
530 | .destroy = NULL, | |
531 | .me = THIS_MODULE | |
532 | }; | |
533 | ||
534 | #ifdef CONFIG_SYSCTL | |
535 | static ctl_table nf_ct_sysctl_table[] = { | |
536 | { | |
537 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED, | |
538 | .procname = "nf_conntrack_sctp_timeout_closed", | |
539 | .data = &nf_ct_sctp_timeout_closed, | |
540 | .maxlen = sizeof(unsigned int), | |
541 | .mode = 0644, | |
542 | .proc_handler = &proc_dointvec_jiffies, | |
543 | }, | |
544 | { | |
545 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT, | |
546 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", | |
547 | .data = &nf_ct_sctp_timeout_cookie_wait, | |
548 | .maxlen = sizeof(unsigned int), | |
549 | .mode = 0644, | |
550 | .proc_handler = &proc_dointvec_jiffies, | |
551 | }, | |
552 | { | |
553 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED, | |
554 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", | |
555 | .data = &nf_ct_sctp_timeout_cookie_echoed, | |
556 | .maxlen = sizeof(unsigned int), | |
557 | .mode = 0644, | |
558 | .proc_handler = &proc_dointvec_jiffies, | |
559 | }, | |
560 | { | |
561 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED, | |
562 | .procname = "nf_conntrack_sctp_timeout_established", | |
563 | .data = &nf_ct_sctp_timeout_established, | |
564 | .maxlen = sizeof(unsigned int), | |
565 | .mode = 0644, | |
566 | .proc_handler = &proc_dointvec_jiffies, | |
567 | }, | |
568 | { | |
569 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT, | |
570 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", | |
571 | .data = &nf_ct_sctp_timeout_shutdown_sent, | |
572 | .maxlen = sizeof(unsigned int), | |
573 | .mode = 0644, | |
574 | .proc_handler = &proc_dointvec_jiffies, | |
575 | }, | |
576 | { | |
577 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD, | |
578 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", | |
579 | .data = &nf_ct_sctp_timeout_shutdown_recd, | |
580 | .maxlen = sizeof(unsigned int), | |
581 | .mode = 0644, | |
582 | .proc_handler = &proc_dointvec_jiffies, | |
583 | }, | |
584 | { | |
585 | .ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT, | |
586 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", | |
587 | .data = &nf_ct_sctp_timeout_shutdown_ack_sent, | |
588 | .maxlen = sizeof(unsigned int), | |
589 | .mode = 0644, | |
590 | .proc_handler = &proc_dointvec_jiffies, | |
591 | }, | |
592 | { .ctl_name = 0 } | |
593 | }; | |
594 | ||
595 | static ctl_table nf_ct_netfilter_table[] = { | |
596 | { | |
597 | .ctl_name = NET_NETFILTER, | |
598 | .procname = "netfilter", | |
599 | .mode = 0555, | |
600 | .child = nf_ct_sysctl_table, | |
601 | }, | |
602 | { .ctl_name = 0 } | |
603 | }; | |
604 | ||
605 | static ctl_table nf_ct_net_table[] = { | |
606 | { | |
607 | .ctl_name = CTL_NET, | |
608 | .procname = "net", | |
609 | .mode = 0555, | |
610 | .child = nf_ct_netfilter_table, | |
611 | }, | |
612 | { .ctl_name = 0 } | |
613 | }; | |
614 | ||
615 | static struct ctl_table_header *nf_ct_sysctl_header; | |
616 | #endif | |
617 | ||
65b4b4e8 | 618 | int __init nf_conntrack_proto_sctp_init(void) |
9fb9cbb1 YK |
619 | { |
620 | int ret; | |
621 | ||
622 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp4); | |
623 | if (ret) { | |
624 | printk("nf_conntrack_proto_sctp4: protocol register failed\n"); | |
625 | goto out; | |
626 | } | |
627 | ret = nf_conntrack_protocol_register(&nf_conntrack_protocol_sctp6); | |
628 | if (ret) { | |
629 | printk("nf_conntrack_proto_sctp6: protocol register failed\n"); | |
630 | goto cleanup_sctp4; | |
631 | } | |
632 | ||
633 | #ifdef CONFIG_SYSCTL | |
634 | nf_ct_sysctl_header = register_sysctl_table(nf_ct_net_table, 0); | |
635 | if (nf_ct_sysctl_header == NULL) { | |
636 | printk("nf_conntrack_proto_sctp: can't register to sysctl.\n"); | |
637 | goto cleanup; | |
638 | } | |
639 | #endif | |
640 | ||
641 | return ret; | |
642 | ||
643 | #ifdef CONFIG_SYSCTL | |
644 | cleanup: | |
645 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6); | |
646 | #endif | |
647 | cleanup_sctp4: | |
648 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4); | |
649 | out: | |
650 | DEBUGP("SCTP conntrack module loading %s\n", | |
651 | ret ? "failed": "succeeded"); | |
652 | return ret; | |
653 | } | |
654 | ||
65b4b4e8 | 655 | void __exit nf_conntrack_proto_sctp_fini(void) |
9fb9cbb1 YK |
656 | { |
657 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp6); | |
658 | nf_conntrack_protocol_unregister(&nf_conntrack_protocol_sctp4); | |
659 | #ifdef CONFIG_SYSCTL | |
660 | unregister_sysctl_table(nf_ct_sysctl_header); | |
661 | #endif | |
662 | DEBUGP("SCTP conntrack module unloaded\n"); | |
663 | } | |
664 | ||
65b4b4e8 AM |
665 | module_init(nf_conntrack_proto_sctp_init); |
666 | module_exit(nf_conntrack_proto_sctp_fini); | |
9fb9cbb1 YK |
667 | |
668 | MODULE_LICENSE("GPL"); | |
669 | MODULE_AUTHOR("Kiran Kumar Immidi"); | |
670 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); |