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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 | |
12 | #include <linux/types.h> |
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> |
21 | #include <linux/spinlock.h> |
22 | #include <linux/interrupt.h> |
23 | |
24 | #include <net/netfilter/nf_conntrack.h> |
25 | #include <net/netfilter/nf_conntrack_l4proto.h> |
26 | #include <net/netfilter/nf_conntrack_ecache.h> |
27 | |
28 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
29 | closely. They're more complex. --RR |
30 | |
31 | And so for me for SCTP :D -Kiran */ |
32 | |
33 | static const char *const sctp_conntrack_names[] = { |
34 | "NONE", |
35 | "CLOSED", |
36 | "COOKIE_WAIT", |
37 | "COOKIE_ECHOED", |
38 | "ESTABLISHED", |
39 | "SHUTDOWN_SENT", |
40 | "SHUTDOWN_RECD", |
41 | "SHUTDOWN_ACK_SENT", |
42 | }; |
43 | |
44 | #define SECS * HZ |
45 | #define MINS * 60 SECS |
46 | #define HOURS * 60 MINS |
47 | #define DAYS * 24 HOURS |
48 | |
49 | static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = { |
50 | [SCTP_CONNTRACK_CLOSED] = 10 SECS, |
51 | [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS, |
52 | [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS, |
53 | [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS, |
54 | [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000, |
55 | [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000, |
56 | [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, |
57 | }; |
58 | |
59 | #define sNO SCTP_CONNTRACK_NONE |
60 | #define sCL SCTP_CONNTRACK_CLOSED |
61 | #define sCW SCTP_CONNTRACK_COOKIE_WAIT |
62 | #define sCE SCTP_CONNTRACK_COOKIE_ECHOED |
63 | #define sES SCTP_CONNTRACK_ESTABLISHED |
64 | #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT |
65 | #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD |
66 | #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT |
67 | #define sIV SCTP_CONNTRACK_MAX |
68 | |
69 | /* |
70 | These are the descriptions of the states: |
71 | |
72 | NOTE: These state names are tantalizingly similar to the states of an |
73 | SCTP endpoint. But the interpretation of the states is a little different, |
74 | considering that these are the states of the connection and not of an end |
75 | point. Please note the subtleties. -Kiran |
76 | |
77 | NONE - Nothing so far. |
78 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
79 | an INIT_ACK chunk in the reply direction. |
80 | COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. |
81 | ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. |
82 | SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. |
83 | SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. |
84 | SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite |
85 | to that of the SHUTDOWN chunk. |
86 | CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of |
87 | the SHUTDOWN chunk. Connection is closed. |
88 | */ |
89 | |
90 | /* TODO |
91 | - I have assumed that the first INIT is in the original direction. |
92 | This messes things when an INIT comes in the reply direction in CLOSED |
93 | state. |
94 | - Check the error type in the reply dir before transitioning from |
95 | cookie echoed to closed. |
96 | - Sec 5.2.4 of RFC 2960 |
97 | - Multi Homing support. |
98 | */ |
99 | |
100 | /* SCTP conntrack state transitions */ |
101 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
102 | { |
103 | /* ORIGINAL */ |
104 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ |
105 | /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA}, |
106 | /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA}, |
107 | /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, |
108 | /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA}, |
109 | /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA}, |
110 | /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/ |
111 | /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ |
112 | /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */ |
113 | /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL} |
114 | }, |
115 | { |
116 | /* REPLY */ |
117 | /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ |
118 | /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */ |
119 | /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA}, |
120 | /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, |
121 | /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA}, |
122 | /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA}, |
123 | /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA}, |
124 | /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */ |
125 | /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA}, |
126 | /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL} |
127 | } |
128 | }; |
129 | |
130 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
131 | struct nf_conntrack_tuple *tuple) |
132 | { |
133 | const struct sctphdr *hp; |
134 | struct sctphdr _hdr; |
135 | |
136 | /* Actually only need first 8 bytes. */ |
137 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); |
138 | if (hp == NULL) |
139 | return false; |
140 | |
141 | tuple->src.u.sctp.port = hp->source; |
142 | tuple->dst.u.sctp.port = hp->dest; |
143 | return true; |
144 | } |
145 | |
146 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
147 | const struct nf_conntrack_tuple *orig) |
148 | { |
149 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
150 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; |
151 | return true; |
152 | } |
153 | |
154 | /* Print out the per-protocol part of the tuple. */ |
155 | static int sctp_print_tuple(struct seq_file *s, |
156 | const struct nf_conntrack_tuple *tuple) |
157 | { |
158 | return seq_printf(s, "sport=%hu dport=%hu ", |
159 | ntohs(tuple->src.u.sctp.port), |
160 | ntohs(tuple->dst.u.sctp.port)); |
161 | } |
162 | |
163 | /* Print out the private part of the conntrack. */ |
164 | static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
165 | { |
166 | enum sctp_conntrack state; |
167 | |
168 | spin_lock_bh(&ct->lock); |
169 | state = ct->proto.sctp.state; |
170 | spin_unlock_bh(&ct->lock); |
171 | |
172 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); |
173 | } |
174 | |
175 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ |
176 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
177 | (offset) < (skb)->len && \ |
178 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ |
179 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) |
180 | |
181 | /* Some validity checks to make sure the chunks are fine */ |
182 | static int do_basic_checks(struct nf_conn *ct, |
183 | const struct sk_buff *skb, |
184 | unsigned int dataoff, |
185 | unsigned long *map) |
186 | { |
187 | u_int32_t offset, count; |
188 | sctp_chunkhdr_t _sch, *sch; |
189 | int flag; |
190 | |
191 | flag = 0; |
192 | |
193 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
194 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
195 | |
196 | if (sch->type == SCTP_CID_INIT || |
197 | sch->type == SCTP_CID_INIT_ACK || |
198 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) |
199 | flag = 1; |
200 | |
201 | /* |
202 | * Cookie Ack/Echo chunks not the first OR |
203 | * Init / Init Ack / Shutdown compl chunks not the only chunks |
204 | * OR zero-length. |
205 | */ |
206 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
207 | sch->type == SCTP_CID_COOKIE_ECHO || |
208 | flag) && |
209 | count != 0) || !sch->length) { |
210 | pr_debug("Basic checks failed\n"); |
211 | return 1; |
212 | } |
213 | |
214 | if (map) |
215 | set_bit(sch->type, map); |
216 | } |
217 | |
218 | pr_debug("Basic checks passed\n"); |
219 | return count == 0; |
220 | } |
221 | |
222 | static int sctp_new_state(enum ip_conntrack_dir dir, |
223 | enum sctp_conntrack cur_state, |
224 | int chunk_type) |
225 | { |
226 | int i; |
227 | |
228 | pr_debug("Chunk type: %d\n", chunk_type); |
229 | |
230 | switch (chunk_type) { |
231 | case SCTP_CID_INIT: |
232 | pr_debug("SCTP_CID_INIT\n"); |
233 | i = 0; |
234 | break; |
235 | case SCTP_CID_INIT_ACK: |
236 | pr_debug("SCTP_CID_INIT_ACK\n"); |
237 | i = 1; |
238 | break; |
239 | case SCTP_CID_ABORT: |
240 | pr_debug("SCTP_CID_ABORT\n"); |
241 | i = 2; |
242 | break; |
243 | case SCTP_CID_SHUTDOWN: |
244 | pr_debug("SCTP_CID_SHUTDOWN\n"); |
245 | i = 3; |
246 | break; |
247 | case SCTP_CID_SHUTDOWN_ACK: |
248 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); |
249 | i = 4; |
250 | break; |
251 | case SCTP_CID_ERROR: |
252 | pr_debug("SCTP_CID_ERROR\n"); |
253 | i = 5; |
254 | break; |
255 | case SCTP_CID_COOKIE_ECHO: |
256 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); |
257 | i = 6; |
258 | break; |
259 | case SCTP_CID_COOKIE_ACK: |
260 | pr_debug("SCTP_CID_COOKIE_ACK\n"); |
261 | i = 7; |
262 | break; |
263 | case SCTP_CID_SHUTDOWN_COMPLETE: |
264 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); |
265 | i = 8; |
266 | break; |
267 | default: |
268 | /* Other chunks like DATA, SACK, HEARTBEAT and |
269 | its ACK do not cause a change in state */ |
270 | pr_debug("Unknown chunk type, Will stay in %s\n", |
271 | sctp_conntrack_names[cur_state]); |
272 | return cur_state; |
273 | } |
274 | |
275 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
276 | dir, sctp_conntrack_names[cur_state], chunk_type, |
277 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); |
278 | |
279 | return sctp_conntracks[dir][i][cur_state]; |
280 | } |
281 | |
282 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
283 | static int sctp_packet(struct nf_conn *ct, |
284 | const struct sk_buff *skb, |
285 | unsigned int dataoff, |
286 | enum ip_conntrack_info ctinfo, |
287 | u_int8_t pf, |
288 | unsigned int hooknum) |
289 | { |
290 | enum sctp_conntrack new_state, old_state; |
291 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
292 | const struct sctphdr *sh; |
293 | struct sctphdr _sctph; |
294 | const struct sctp_chunkhdr *sch; |
295 | struct sctp_chunkhdr _sch; |
296 | u_int32_t offset, count; |
297 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
298 | |
299 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
300 | if (sh == NULL) |
301 | goto out; |
302 | |
303 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
304 | goto out; |
305 | |
306 | /* Check the verification tag (Sec 8.5) */ |
307 | if (!test_bit(SCTP_CID_INIT, map) && |
308 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && |
309 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && |
310 | !test_bit(SCTP_CID_ABORT, map) && |
311 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && |
312 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
313 | pr_debug("Verification tag check failed\n"); |
314 | goto out; |
315 | } |
316 | |
317 | old_state = new_state = SCTP_CONNTRACK_NONE; |
318 | spin_lock_bh(&ct->lock); |
319 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
320 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
321 | if (sch->type == SCTP_CID_INIT) { |
322 | /* Sec 8.5.1 (A) */ |
323 | if (sh->vtag != 0) |
324 | goto out_unlock; |
325 | } else if (sch->type == SCTP_CID_ABORT) { |
326 | /* Sec 8.5.1 (B) */ |
327 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
328 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
329 | goto out_unlock; |
330 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
331 | /* Sec 8.5.1 (C) */ |
332 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
333 | sh->vtag != ct->proto.sctp.vtag[!dir] && |
334 | sch->flags & SCTP_CHUNK_FLAG_T) |
335 | goto out_unlock; |
336 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
337 | /* Sec 8.5.1 (D) */ |
338 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
339 | goto out_unlock; |
340 | } |
341 | |
342 | old_state = ct->proto.sctp.state; |
343 | new_state = sctp_new_state(dir, old_state, sch->type); |
344 | |
345 | /* Invalid */ |
346 | if (new_state == SCTP_CONNTRACK_MAX) { |
347 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
348 | "conntrack=%u\n", |
349 | dir, sch->type, old_state); |
350 | goto out_unlock; |
351 | } |
352 | |
353 | /* If it is an INIT or an INIT ACK note down the vtag */ |
354 | if (sch->type == SCTP_CID_INIT || |
355 | sch->type == SCTP_CID_INIT_ACK) { |
356 | sctp_inithdr_t _inithdr, *ih; |
357 | |
358 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), |
359 | sizeof(_inithdr), &_inithdr); |
360 | if (ih == NULL) |
361 | goto out_unlock; |
362 | pr_debug("Setting vtag %x for dir %d\n", |
363 | ih->init_tag, !dir); |
364 | ct->proto.sctp.vtag[!dir] = ih->init_tag; |
365 | } |
366 | |
367 | ct->proto.sctp.state = new_state; |
368 | if (old_state != new_state) |
369 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
370 | } |
371 | spin_unlock_bh(&ct->lock); |
372 | |
373 | nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]); |
374 | |
375 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
376 | dir == IP_CT_DIR_REPLY && |
377 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
378 | pr_debug("Setting assured bit\n"); |
379 | set_bit(IPS_ASSURED_BIT, &ct->status); |
380 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
381 | } |
382 | |
383 | return NF_ACCEPT; |
384 | |
385 | out_unlock: |
386 | spin_unlock_bh(&ct->lock); |
387 | out: |
388 | return -NF_ACCEPT; |
389 | } |
390 | |
391 | /* Called when a new connection for this protocol found. */ |
392 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
393 | unsigned int dataoff) |
394 | { |
395 | enum sctp_conntrack new_state; |
396 | const struct sctphdr *sh; |
397 | struct sctphdr _sctph; |
398 | const struct sctp_chunkhdr *sch; |
399 | struct sctp_chunkhdr _sch; |
400 | u_int32_t offset, count; |
401 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
402 | |
403 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
404 | if (sh == NULL) |
405 | return false; |
406 | |
407 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
408 | return false; |
409 | |
410 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ |
411 | if (test_bit(SCTP_CID_ABORT, map) || |
412 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || |
413 | test_bit(SCTP_CID_COOKIE_ACK, map)) |
414 | return false; |
415 | |
416 | new_state = SCTP_CONNTRACK_MAX; |
417 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
418 | /* Don't need lock here: this conntrack not in circulation yet */ |
419 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
420 | SCTP_CONNTRACK_NONE, sch->type); |
421 | |
422 | /* Invalid: delete conntrack */ |
423 | if (new_state == SCTP_CONNTRACK_NONE || |
424 | new_state == SCTP_CONNTRACK_MAX) { |
425 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
426 | return false; |
427 | } |
428 | |
429 | /* Copy the vtag into the state info */ |
430 | if (sch->type == SCTP_CID_INIT) { |
431 | if (sh->vtag == 0) { |
432 | sctp_inithdr_t _inithdr, *ih; |
433 | |
434 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), |
435 | sizeof(_inithdr), &_inithdr); |
436 | if (ih == NULL) |
437 | return false; |
438 | |
439 | pr_debug("Setting vtag %x for new conn\n", |
440 | ih->init_tag); |
441 | |
442 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
443 | ih->init_tag; |
444 | } else { |
445 | /* Sec 8.5.1 (A) */ |
446 | return false; |
447 | } |
448 | } |
449 | /* If it is a shutdown ack OOTB packet, we expect a return |
450 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ |
451 | else { |
452 | pr_debug("Setting vtag %x for new conn OOTB\n", |
453 | sh->vtag); |
454 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
455 | } |
456 | |
457 | ct->proto.sctp.state = new_state; |
458 | } |
459 | |
460 | return true; |
461 | } |
462 | |
463 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
464 | |
465 | #include <linux/netfilter/nfnetlink.h> |
466 | #include <linux/netfilter/nfnetlink_conntrack.h> |
467 | |
468 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
469 | struct nf_conn *ct) |
470 | { |
471 | struct nlattr *nest_parms; |
472 | |
473 | spin_lock_bh(&ct->lock); |
474 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
475 | if (!nest_parms) |
476 | goto nla_put_failure; |
477 | |
478 | NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state); |
479 | |
480 | NLA_PUT_BE32(skb, |
481 | CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, |
482 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]); |
483 | |
484 | NLA_PUT_BE32(skb, |
485 | CTA_PROTOINFO_SCTP_VTAG_REPLY, |
486 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY]); |
487 | |
488 | spin_unlock_bh(&ct->lock); |
489 | |
490 | nla_nest_end(skb, nest_parms); |
491 | |
492 | return 0; |
493 | |
494 | nla_put_failure: |
495 | spin_unlock_bh(&ct->lock); |
496 | return -1; |
497 | } |
498 | |
499 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { |
500 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, |
501 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, |
502 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, |
503 | }; |
504 | |
505 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) |
506 | { |
507 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; |
508 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; |
509 | int err; |
510 | |
511 | /* updates may not contain the internal protocol info, skip parsing */ |
512 | if (!attr) |
513 | return 0; |
514 | |
515 | err = nla_parse_nested(tb, |
516 | CTA_PROTOINFO_SCTP_MAX, |
517 | attr, |
518 | sctp_nla_policy); |
519 | if (err < 0) |
520 | return err; |
521 | |
522 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || |
523 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || |
524 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) |
525 | return -EINVAL; |
526 | |
527 | spin_lock_bh(&ct->lock); |
528 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); |
529 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = |
530 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
531 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
532 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
533 | spin_unlock_bh(&ct->lock); |
534 | |
535 | return 0; |
536 | } |
537 | |
538 | static int sctp_nlattr_size(void) |
539 | { |
540 | return nla_total_size(0) /* CTA_PROTOINFO_SCTP */ |
541 | + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1); |
542 | } |
543 | #endif |
544 | |
545 | #ifdef CONFIG_SYSCTL |
546 | static unsigned int sctp_sysctl_table_users; |
547 | static struct ctl_table_header *sctp_sysctl_header; |
548 | static struct ctl_table sctp_sysctl_table[] = { |
549 | { |
550 | .procname = "nf_conntrack_sctp_timeout_closed", |
551 | .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], |
552 | .maxlen = sizeof(unsigned int), |
553 | .mode = 0644, |
554 | .proc_handler = proc_dointvec_jiffies, |
555 | }, |
556 | { |
557 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
558 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], |
559 | .maxlen = sizeof(unsigned int), |
560 | .mode = 0644, |
561 | .proc_handler = proc_dointvec_jiffies, |
562 | }, |
563 | { |
564 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
565 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], |
566 | .maxlen = sizeof(unsigned int), |
567 | .mode = 0644, |
568 | .proc_handler = proc_dointvec_jiffies, |
569 | }, |
570 | { |
571 | .procname = "nf_conntrack_sctp_timeout_established", |
572 | .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], |
573 | .maxlen = sizeof(unsigned int), |
574 | .mode = 0644, |
575 | .proc_handler = proc_dointvec_jiffies, |
576 | }, |
577 | { |
578 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
579 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], |
580 | .maxlen = sizeof(unsigned int), |
581 | .mode = 0644, |
582 | .proc_handler = proc_dointvec_jiffies, |
583 | }, |
584 | { |
585 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
586 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], |
587 | .maxlen = sizeof(unsigned int), |
588 | .mode = 0644, |
589 | .proc_handler = proc_dointvec_jiffies, |
590 | }, |
591 | { |
592 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
593 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], |
594 | .maxlen = sizeof(unsigned int), |
595 | .mode = 0644, |
596 | .proc_handler = proc_dointvec_jiffies, |
597 | }, |
598 | { } |
599 | }; |
600 | |
601 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
602 | static struct ctl_table sctp_compat_sysctl_table[] = { |
603 | { |
604 | .procname = "ip_conntrack_sctp_timeout_closed", |
605 | .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], |
606 | .maxlen = sizeof(unsigned int), |
607 | .mode = 0644, |
608 | .proc_handler = proc_dointvec_jiffies, |
609 | }, |
610 | { |
611 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
612 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], |
613 | .maxlen = sizeof(unsigned int), |
614 | .mode = 0644, |
615 | .proc_handler = proc_dointvec_jiffies, |
616 | }, |
617 | { |
618 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
619 | .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], |
620 | .maxlen = sizeof(unsigned int), |
621 | .mode = 0644, |
622 | .proc_handler = proc_dointvec_jiffies, |
623 | }, |
624 | { |
625 | .procname = "ip_conntrack_sctp_timeout_established", |
626 | .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], |
627 | .maxlen = sizeof(unsigned int), |
628 | .mode = 0644, |
629 | .proc_handler = proc_dointvec_jiffies, |
630 | }, |
631 | { |
632 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
633 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], |
634 | .maxlen = sizeof(unsigned int), |
635 | .mode = 0644, |
636 | .proc_handler = proc_dointvec_jiffies, |
637 | }, |
638 | { |
639 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
640 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], |
641 | .maxlen = sizeof(unsigned int), |
642 | .mode = 0644, |
643 | .proc_handler = proc_dointvec_jiffies, |
644 | }, |
645 | { |
646 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
647 | .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], |
648 | .maxlen = sizeof(unsigned int), |
649 | .mode = 0644, |
650 | .proc_handler = proc_dointvec_jiffies, |
651 | }, |
652 | { } |
653 | }; |
654 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
655 | #endif |
656 | |
657 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
658 | .l3proto = PF_INET, |
659 | .l4proto = IPPROTO_SCTP, |
660 | .name = "sctp", |
661 | .pkt_to_tuple = sctp_pkt_to_tuple, |
662 | .invert_tuple = sctp_invert_tuple, |
663 | .print_tuple = sctp_print_tuple, |
664 | .print_conntrack = sctp_print_conntrack, |
665 | .packet = sctp_packet, |
666 | .new = sctp_new, |
667 | .me = THIS_MODULE, |
668 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
669 | .to_nlattr = sctp_to_nlattr, |
670 | .nlattr_size = sctp_nlattr_size, |
671 | .from_nlattr = nlattr_to_sctp, |
672 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
673 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
674 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
675 | .nla_policy = nf_ct_port_nla_policy, |
676 | #endif |
677 | #ifdef CONFIG_SYSCTL |
678 | .ctl_table_users = &sctp_sysctl_table_users, |
679 | .ctl_table_header = &sctp_sysctl_header, |
680 | .ctl_table = sctp_sysctl_table, |
681 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
682 | .ctl_compat_table = sctp_compat_sysctl_table, |
683 | #endif |
684 | #endif |
685 | }; |
686 | |
687 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
688 | .l3proto = PF_INET6, |
689 | .l4proto = IPPROTO_SCTP, |
690 | .name = "sctp", |
691 | .pkt_to_tuple = sctp_pkt_to_tuple, |
692 | .invert_tuple = sctp_invert_tuple, |
693 | .print_tuple = sctp_print_tuple, |
694 | .print_conntrack = sctp_print_conntrack, |
695 | .packet = sctp_packet, |
696 | .new = sctp_new, |
697 | .me = THIS_MODULE, |
698 | #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) |
699 | .to_nlattr = sctp_to_nlattr, |
700 | .nlattr_size = sctp_nlattr_size, |
701 | .from_nlattr = nlattr_to_sctp, |
702 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
703 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
704 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
705 | .nla_policy = nf_ct_port_nla_policy, |
706 | #endif |
707 | #ifdef CONFIG_SYSCTL |
708 | .ctl_table_users = &sctp_sysctl_table_users, |
709 | .ctl_table_header = &sctp_sysctl_header, |
710 | .ctl_table = sctp_sysctl_table, |
711 | #endif |
712 | }; |
713 | |
714 | static int __init nf_conntrack_proto_sctp_init(void) |
715 | { |
716 | int ret; |
717 | |
718 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4); |
719 | if (ret) { |
720 | printk("nf_conntrack_l4proto_sctp4: protocol register failed\n"); |
721 | goto out; |
722 | } |
723 | ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6); |
724 | if (ret) { |
725 | printk("nf_conntrack_l4proto_sctp6: protocol register failed\n"); |
726 | goto cleanup_sctp4; |
727 | } |
728 | |
729 | return ret; |
730 | |
731 | cleanup_sctp4: |
732 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
733 | out: |
734 | return ret; |
735 | } |
736 | |
737 | static void __exit nf_conntrack_proto_sctp_fini(void) |
738 | { |
739 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
740 | nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
741 | } |
742 | |
743 | module_init(nf_conntrack_proto_sctp_init); |
744 | module_exit(nf_conntrack_proto_sctp_fini); |
745 | |
746 | MODULE_LICENSE("GPL"); |
747 | MODULE_AUTHOR("Kiran Kumar Immidi"); |
748 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); |
749 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |
750 |
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