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1 | /* |
2 | * Connection tracking protocol helper module for SCTP. |
3 | * |
4 | * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com> |
5 | * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net> |
6 | * |
7 | * SCTP is defined in RFC 2960. References to various sections in this code |
8 | * are to this RFC. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2 as |
12 | * published by the Free Software Foundation. |
13 | */ |
14 | |
15 | #include <linux/types.h> |
16 | #include <linux/timer.h> |
17 | #include <linux/netfilter.h> |
18 | #include <linux/module.h> |
19 | #include <linux/in.h> |
20 | #include <linux/ip.h> |
21 | #include <linux/sctp.h> |
22 | #include <linux/string.h> |
23 | #include <linux/seq_file.h> |
24 | #include <linux/spinlock.h> |
25 | #include <linux/interrupt.h> |
26 | |
27 | #include <net/netfilter/nf_conntrack.h> |
28 | #include <net/netfilter/nf_conntrack_l4proto.h> |
29 | #include <net/netfilter/nf_conntrack_ecache.h> |
30 | |
31 | /* FIXME: Examine ipfilter's timeouts and conntrack transitions more |
32 | closely. They're more complex. --RR |
33 | |
34 | And so for me for SCTP :D -Kiran */ |
35 | |
36 | static const char *const 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 | |
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 | }; |
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 | |
72 | /* |
73 | These are the descriptions of the states: |
74 | |
75 | NOTE: These state names are tantalizingly similar to the states of an |
76 | SCTP endpoint. But the interpretation of the states is a little different, |
77 | considering that these are the states of the connection and not of an end |
78 | point. Please note the subtleties. -Kiran |
79 | |
80 | NONE - Nothing so far. |
81 | COOKIE WAIT - We have seen an INIT chunk in the original direction, or also |
82 | an INIT_ACK chunk in the reply direction. |
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 |
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. |
91 | */ |
92 | |
93 | /* TODO |
94 | - I have assumed that the first INIT is in the original direction. |
95 | This messes things when an INIT comes in the reply direction in CLOSED |
96 | state. |
97 | - Check the error type in the reply dir before transitioning from |
98 | cookie echoed to closed. |
99 | - Sec 5.2.4 of RFC 2960 |
100 | - Multi Homing support. |
101 | */ |
102 | |
103 | /* SCTP conntrack state transitions */ |
104 | static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { |
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},/* Can't 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},/* Can't 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},/* Can't 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 | |
133 | static int sctp_net_id __read_mostly; |
134 | struct sctp_net { |
135 | struct nf_proto_net pn; |
136 | unsigned int timeouts[SCTP_CONNTRACK_MAX]; |
137 | }; |
138 | |
139 | static inline struct sctp_net *sctp_pernet(struct net *net) |
140 | { |
141 | return net_generic(net, sctp_net_id); |
142 | } |
143 | |
144 | static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, |
145 | struct nf_conntrack_tuple *tuple) |
146 | { |
147 | const struct sctphdr *hp; |
148 | struct sctphdr _hdr; |
149 | |
150 | /* Actually only need first 8 bytes. */ |
151 | hp = skb_header_pointer(skb, dataoff, 8, &_hdr); |
152 | if (hp == NULL) |
153 | return false; |
154 | |
155 | tuple->src.u.sctp.port = hp->source; |
156 | tuple->dst.u.sctp.port = hp->dest; |
157 | return true; |
158 | } |
159 | |
160 | static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, |
161 | const struct nf_conntrack_tuple *orig) |
162 | { |
163 | tuple->src.u.sctp.port = orig->dst.u.sctp.port; |
164 | tuple->dst.u.sctp.port = orig->src.u.sctp.port; |
165 | return true; |
166 | } |
167 | |
168 | /* Print out the per-protocol part of the tuple. */ |
169 | static int sctp_print_tuple(struct seq_file *s, |
170 | const struct nf_conntrack_tuple *tuple) |
171 | { |
172 | return seq_printf(s, "sport=%hu dport=%hu ", |
173 | ntohs(tuple->src.u.sctp.port), |
174 | ntohs(tuple->dst.u.sctp.port)); |
175 | } |
176 | |
177 | /* Print out the private part of the conntrack. */ |
178 | static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct) |
179 | { |
180 | enum sctp_conntrack state; |
181 | |
182 | spin_lock_bh(&ct->lock); |
183 | state = ct->proto.sctp.state; |
184 | spin_unlock_bh(&ct->lock); |
185 | |
186 | return seq_printf(s, "%s ", sctp_conntrack_names[state]); |
187 | } |
188 | |
189 | #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ |
190 | for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ |
191 | (offset) < (skb)->len && \ |
192 | ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ |
193 | (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) |
194 | |
195 | /* Some validity checks to make sure the chunks are fine */ |
196 | static int do_basic_checks(struct nf_conn *ct, |
197 | const struct sk_buff *skb, |
198 | unsigned int dataoff, |
199 | unsigned long *map) |
200 | { |
201 | u_int32_t offset, count; |
202 | sctp_chunkhdr_t _sch, *sch; |
203 | int flag; |
204 | |
205 | flag = 0; |
206 | |
207 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
208 | pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); |
209 | |
210 | if (sch->type == SCTP_CID_INIT || |
211 | sch->type == SCTP_CID_INIT_ACK || |
212 | sch->type == SCTP_CID_SHUTDOWN_COMPLETE) |
213 | flag = 1; |
214 | |
215 | /* |
216 | * Cookie Ack/Echo chunks not the first OR |
217 | * Init / Init Ack / Shutdown compl chunks not the only chunks |
218 | * OR zero-length. |
219 | */ |
220 | if (((sch->type == SCTP_CID_COOKIE_ACK || |
221 | sch->type == SCTP_CID_COOKIE_ECHO || |
222 | flag) && |
223 | count != 0) || !sch->length) { |
224 | pr_debug("Basic checks failed\n"); |
225 | return 1; |
226 | } |
227 | |
228 | if (map) |
229 | set_bit(sch->type, map); |
230 | } |
231 | |
232 | pr_debug("Basic checks passed\n"); |
233 | return count == 0; |
234 | } |
235 | |
236 | static int sctp_new_state(enum ip_conntrack_dir dir, |
237 | enum sctp_conntrack cur_state, |
238 | int chunk_type) |
239 | { |
240 | int i; |
241 | |
242 | pr_debug("Chunk type: %d\n", chunk_type); |
243 | |
244 | switch (chunk_type) { |
245 | case SCTP_CID_INIT: |
246 | pr_debug("SCTP_CID_INIT\n"); |
247 | i = 0; |
248 | break; |
249 | case SCTP_CID_INIT_ACK: |
250 | pr_debug("SCTP_CID_INIT_ACK\n"); |
251 | i = 1; |
252 | break; |
253 | case SCTP_CID_ABORT: |
254 | pr_debug("SCTP_CID_ABORT\n"); |
255 | i = 2; |
256 | break; |
257 | case SCTP_CID_SHUTDOWN: |
258 | pr_debug("SCTP_CID_SHUTDOWN\n"); |
259 | i = 3; |
260 | break; |
261 | case SCTP_CID_SHUTDOWN_ACK: |
262 | pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); |
263 | i = 4; |
264 | break; |
265 | case SCTP_CID_ERROR: |
266 | pr_debug("SCTP_CID_ERROR\n"); |
267 | i = 5; |
268 | break; |
269 | case SCTP_CID_COOKIE_ECHO: |
270 | pr_debug("SCTP_CID_COOKIE_ECHO\n"); |
271 | i = 6; |
272 | break; |
273 | case SCTP_CID_COOKIE_ACK: |
274 | pr_debug("SCTP_CID_COOKIE_ACK\n"); |
275 | i = 7; |
276 | break; |
277 | case SCTP_CID_SHUTDOWN_COMPLETE: |
278 | pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); |
279 | i = 8; |
280 | break; |
281 | default: |
282 | /* Other chunks like DATA, SACK, HEARTBEAT and |
283 | its ACK do not cause a change in state */ |
284 | pr_debug("Unknown chunk type, Will stay in %s\n", |
285 | sctp_conntrack_names[cur_state]); |
286 | return cur_state; |
287 | } |
288 | |
289 | pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", |
290 | dir, sctp_conntrack_names[cur_state], chunk_type, |
291 | sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); |
292 | |
293 | return sctp_conntracks[dir][i][cur_state]; |
294 | } |
295 | |
296 | static unsigned int *sctp_get_timeouts(struct net *net) |
297 | { |
298 | return sctp_pernet(net)->timeouts; |
299 | } |
300 | |
301 | /* Returns verdict for packet, or -NF_ACCEPT for invalid. */ |
302 | static int sctp_packet(struct nf_conn *ct, |
303 | const struct sk_buff *skb, |
304 | unsigned int dataoff, |
305 | enum ip_conntrack_info ctinfo, |
306 | u_int8_t pf, |
307 | unsigned int hooknum, |
308 | unsigned int *timeouts) |
309 | { |
310 | enum sctp_conntrack new_state, old_state; |
311 | enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); |
312 | const struct sctphdr *sh; |
313 | struct sctphdr _sctph; |
314 | const struct sctp_chunkhdr *sch; |
315 | struct sctp_chunkhdr _sch; |
316 | u_int32_t offset, count; |
317 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
318 | |
319 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
320 | if (sh == NULL) |
321 | goto out; |
322 | |
323 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
324 | goto out; |
325 | |
326 | /* Check the verification tag (Sec 8.5) */ |
327 | if (!test_bit(SCTP_CID_INIT, map) && |
328 | !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && |
329 | !test_bit(SCTP_CID_COOKIE_ECHO, map) && |
330 | !test_bit(SCTP_CID_ABORT, map) && |
331 | !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && |
332 | sh->vtag != ct->proto.sctp.vtag[dir]) { |
333 | pr_debug("Verification tag check failed\n"); |
334 | goto out; |
335 | } |
336 | |
337 | old_state = new_state = SCTP_CONNTRACK_NONE; |
338 | spin_lock_bh(&ct->lock); |
339 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
340 | /* Special cases of Verification tag check (Sec 8.5.1) */ |
341 | if (sch->type == SCTP_CID_INIT) { |
342 | /* Sec 8.5.1 (A) */ |
343 | if (sh->vtag != 0) |
344 | goto out_unlock; |
345 | } else if (sch->type == SCTP_CID_ABORT) { |
346 | /* Sec 8.5.1 (B) */ |
347 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
348 | sh->vtag != ct->proto.sctp.vtag[!dir]) |
349 | goto out_unlock; |
350 | } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) { |
351 | /* Sec 8.5.1 (C) */ |
352 | if (sh->vtag != ct->proto.sctp.vtag[dir] && |
353 | sh->vtag != ct->proto.sctp.vtag[!dir] && |
354 | sch->flags & SCTP_CHUNK_FLAG_T) |
355 | goto out_unlock; |
356 | } else if (sch->type == SCTP_CID_COOKIE_ECHO) { |
357 | /* Sec 8.5.1 (D) */ |
358 | if (sh->vtag != ct->proto.sctp.vtag[dir]) |
359 | goto out_unlock; |
360 | } |
361 | |
362 | old_state = ct->proto.sctp.state; |
363 | new_state = sctp_new_state(dir, old_state, sch->type); |
364 | |
365 | /* Invalid */ |
366 | if (new_state == SCTP_CONNTRACK_MAX) { |
367 | pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " |
368 | "conntrack=%u\n", |
369 | dir, sch->type, old_state); |
370 | goto out_unlock; |
371 | } |
372 | |
373 | /* If it is an INIT or an INIT ACK note down the vtag */ |
374 | if (sch->type == SCTP_CID_INIT || |
375 | sch->type == SCTP_CID_INIT_ACK) { |
376 | sctp_inithdr_t _inithdr, *ih; |
377 | |
378 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), |
379 | sizeof(_inithdr), &_inithdr); |
380 | if (ih == NULL) |
381 | goto out_unlock; |
382 | pr_debug("Setting vtag %x for dir %d\n", |
383 | ih->init_tag, !dir); |
384 | ct->proto.sctp.vtag[!dir] = ih->init_tag; |
385 | } |
386 | |
387 | ct->proto.sctp.state = new_state; |
388 | if (old_state != new_state) |
389 | nf_conntrack_event_cache(IPCT_PROTOINFO, ct); |
390 | } |
391 | spin_unlock_bh(&ct->lock); |
392 | |
393 | nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]); |
394 | |
395 | if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && |
396 | dir == IP_CT_DIR_REPLY && |
397 | new_state == SCTP_CONNTRACK_ESTABLISHED) { |
398 | pr_debug("Setting assured bit\n"); |
399 | set_bit(IPS_ASSURED_BIT, &ct->status); |
400 | nf_conntrack_event_cache(IPCT_ASSURED, ct); |
401 | } |
402 | |
403 | return NF_ACCEPT; |
404 | |
405 | out_unlock: |
406 | spin_unlock_bh(&ct->lock); |
407 | out: |
408 | return -NF_ACCEPT; |
409 | } |
410 | |
411 | /* Called when a new connection for this protocol found. */ |
412 | static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, |
413 | unsigned int dataoff, unsigned int *timeouts) |
414 | { |
415 | enum sctp_conntrack new_state; |
416 | const struct sctphdr *sh; |
417 | struct sctphdr _sctph; |
418 | const struct sctp_chunkhdr *sch; |
419 | struct sctp_chunkhdr _sch; |
420 | u_int32_t offset, count; |
421 | unsigned long map[256 / sizeof(unsigned long)] = { 0 }; |
422 | |
423 | sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); |
424 | if (sh == NULL) |
425 | return false; |
426 | |
427 | if (do_basic_checks(ct, skb, dataoff, map) != 0) |
428 | return false; |
429 | |
430 | /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ |
431 | if (test_bit(SCTP_CID_ABORT, map) || |
432 | test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || |
433 | test_bit(SCTP_CID_COOKIE_ACK, map)) |
434 | return false; |
435 | |
436 | memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp)); |
437 | new_state = SCTP_CONNTRACK_MAX; |
438 | for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { |
439 | /* Don't need lock here: this conntrack not in circulation yet */ |
440 | new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, |
441 | SCTP_CONNTRACK_NONE, sch->type); |
442 | |
443 | /* Invalid: delete conntrack */ |
444 | if (new_state == SCTP_CONNTRACK_NONE || |
445 | new_state == SCTP_CONNTRACK_MAX) { |
446 | pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); |
447 | return false; |
448 | } |
449 | |
450 | /* Copy the vtag into the state info */ |
451 | if (sch->type == SCTP_CID_INIT) { |
452 | if (sh->vtag == 0) { |
453 | sctp_inithdr_t _inithdr, *ih; |
454 | |
455 | ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), |
456 | sizeof(_inithdr), &_inithdr); |
457 | if (ih == NULL) |
458 | return false; |
459 | |
460 | pr_debug("Setting vtag %x for new conn\n", |
461 | ih->init_tag); |
462 | |
463 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
464 | ih->init_tag; |
465 | } else { |
466 | /* Sec 8.5.1 (A) */ |
467 | return false; |
468 | } |
469 | } |
470 | /* If it is a shutdown ack OOTB packet, we expect a return |
471 | shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ |
472 | else { |
473 | pr_debug("Setting vtag %x for new conn OOTB\n", |
474 | sh->vtag); |
475 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; |
476 | } |
477 | |
478 | ct->proto.sctp.state = new_state; |
479 | } |
480 | |
481 | return true; |
482 | } |
483 | |
484 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
485 | |
486 | #include <linux/netfilter/nfnetlink.h> |
487 | #include <linux/netfilter/nfnetlink_conntrack.h> |
488 | |
489 | static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, |
490 | struct nf_conn *ct) |
491 | { |
492 | struct nlattr *nest_parms; |
493 | |
494 | spin_lock_bh(&ct->lock); |
495 | nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); |
496 | if (!nest_parms) |
497 | goto nla_put_failure; |
498 | |
499 | if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) || |
500 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, |
501 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) || |
502 | nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY, |
503 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY])) |
504 | goto nla_put_failure; |
505 | |
506 | spin_unlock_bh(&ct->lock); |
507 | |
508 | nla_nest_end(skb, nest_parms); |
509 | |
510 | return 0; |
511 | |
512 | nla_put_failure: |
513 | spin_unlock_bh(&ct->lock); |
514 | return -1; |
515 | } |
516 | |
517 | static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { |
518 | [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, |
519 | [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, |
520 | [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, |
521 | }; |
522 | |
523 | static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) |
524 | { |
525 | struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; |
526 | struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; |
527 | int err; |
528 | |
529 | /* updates may not contain the internal protocol info, skip parsing */ |
530 | if (!attr) |
531 | return 0; |
532 | |
533 | err = nla_parse_nested(tb, |
534 | CTA_PROTOINFO_SCTP_MAX, |
535 | attr, |
536 | sctp_nla_policy); |
537 | if (err < 0) |
538 | return err; |
539 | |
540 | if (!tb[CTA_PROTOINFO_SCTP_STATE] || |
541 | !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || |
542 | !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) |
543 | return -EINVAL; |
544 | |
545 | spin_lock_bh(&ct->lock); |
546 | ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); |
547 | ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = |
548 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); |
549 | ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = |
550 | nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); |
551 | spin_unlock_bh(&ct->lock); |
552 | |
553 | return 0; |
554 | } |
555 | |
556 | static int sctp_nlattr_size(void) |
557 | { |
558 | return nla_total_size(0) /* CTA_PROTOINFO_SCTP */ |
559 | + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1); |
560 | } |
561 | #endif |
562 | |
563 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
564 | |
565 | #include <linux/netfilter/nfnetlink.h> |
566 | #include <linux/netfilter/nfnetlink_cttimeout.h> |
567 | |
568 | static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[], |
569 | struct net *net, void *data) |
570 | { |
571 | unsigned int *timeouts = data; |
572 | struct sctp_net *sn = sctp_pernet(net); |
573 | int i; |
574 | |
575 | /* set default SCTP timeouts. */ |
576 | for (i=0; i<SCTP_CONNTRACK_MAX; i++) |
577 | timeouts[i] = sn->timeouts[i]; |
578 | |
579 | /* there's a 1:1 mapping between attributes and protocol states. */ |
580 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
581 | if (tb[i]) { |
582 | timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ; |
583 | } |
584 | } |
585 | return 0; |
586 | } |
587 | |
588 | static int |
589 | sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) |
590 | { |
591 | const unsigned int *timeouts = data; |
592 | int i; |
593 | |
594 | for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) { |
595 | if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ))) |
596 | goto nla_put_failure; |
597 | } |
598 | return 0; |
599 | |
600 | nla_put_failure: |
601 | return -ENOSPC; |
602 | } |
603 | |
604 | static const struct nla_policy |
605 | sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = { |
606 | [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 }, |
607 | [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 }, |
608 | [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 }, |
609 | [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 }, |
610 | [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 }, |
611 | [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 }, |
612 | [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, |
613 | }; |
614 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
615 | |
616 | |
617 | #ifdef CONFIG_SYSCTL |
618 | static struct ctl_table sctp_sysctl_table[] = { |
619 | { |
620 | .procname = "nf_conntrack_sctp_timeout_closed", |
621 | .maxlen = sizeof(unsigned int), |
622 | .mode = 0644, |
623 | .proc_handler = proc_dointvec_jiffies, |
624 | }, |
625 | { |
626 | .procname = "nf_conntrack_sctp_timeout_cookie_wait", |
627 | .maxlen = sizeof(unsigned int), |
628 | .mode = 0644, |
629 | .proc_handler = proc_dointvec_jiffies, |
630 | }, |
631 | { |
632 | .procname = "nf_conntrack_sctp_timeout_cookie_echoed", |
633 | .maxlen = sizeof(unsigned int), |
634 | .mode = 0644, |
635 | .proc_handler = proc_dointvec_jiffies, |
636 | }, |
637 | { |
638 | .procname = "nf_conntrack_sctp_timeout_established", |
639 | .maxlen = sizeof(unsigned int), |
640 | .mode = 0644, |
641 | .proc_handler = proc_dointvec_jiffies, |
642 | }, |
643 | { |
644 | .procname = "nf_conntrack_sctp_timeout_shutdown_sent", |
645 | .maxlen = sizeof(unsigned int), |
646 | .mode = 0644, |
647 | .proc_handler = proc_dointvec_jiffies, |
648 | }, |
649 | { |
650 | .procname = "nf_conntrack_sctp_timeout_shutdown_recd", |
651 | .maxlen = sizeof(unsigned int), |
652 | .mode = 0644, |
653 | .proc_handler = proc_dointvec_jiffies, |
654 | }, |
655 | { |
656 | .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", |
657 | .maxlen = sizeof(unsigned int), |
658 | .mode = 0644, |
659 | .proc_handler = proc_dointvec_jiffies, |
660 | }, |
661 | { } |
662 | }; |
663 | |
664 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
665 | static struct ctl_table sctp_compat_sysctl_table[] = { |
666 | { |
667 | .procname = "ip_conntrack_sctp_timeout_closed", |
668 | .maxlen = sizeof(unsigned int), |
669 | .mode = 0644, |
670 | .proc_handler = proc_dointvec_jiffies, |
671 | }, |
672 | { |
673 | .procname = "ip_conntrack_sctp_timeout_cookie_wait", |
674 | .maxlen = sizeof(unsigned int), |
675 | .mode = 0644, |
676 | .proc_handler = proc_dointvec_jiffies, |
677 | }, |
678 | { |
679 | .procname = "ip_conntrack_sctp_timeout_cookie_echoed", |
680 | .maxlen = sizeof(unsigned int), |
681 | .mode = 0644, |
682 | .proc_handler = proc_dointvec_jiffies, |
683 | }, |
684 | { |
685 | .procname = "ip_conntrack_sctp_timeout_established", |
686 | .maxlen = sizeof(unsigned int), |
687 | .mode = 0644, |
688 | .proc_handler = proc_dointvec_jiffies, |
689 | }, |
690 | { |
691 | .procname = "ip_conntrack_sctp_timeout_shutdown_sent", |
692 | .maxlen = sizeof(unsigned int), |
693 | .mode = 0644, |
694 | .proc_handler = proc_dointvec_jiffies, |
695 | }, |
696 | { |
697 | .procname = "ip_conntrack_sctp_timeout_shutdown_recd", |
698 | .maxlen = sizeof(unsigned int), |
699 | .mode = 0644, |
700 | .proc_handler = proc_dointvec_jiffies, |
701 | }, |
702 | { |
703 | .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", |
704 | .maxlen = sizeof(unsigned int), |
705 | .mode = 0644, |
706 | .proc_handler = proc_dointvec_jiffies, |
707 | }, |
708 | { } |
709 | }; |
710 | #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ |
711 | #endif |
712 | |
713 | static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn, |
714 | struct sctp_net *sn) |
715 | { |
716 | #ifdef CONFIG_SYSCTL |
717 | if (pn->ctl_table) |
718 | return 0; |
719 | |
720 | pn->ctl_table = kmemdup(sctp_sysctl_table, |
721 | sizeof(sctp_sysctl_table), |
722 | GFP_KERNEL); |
723 | if (!pn->ctl_table) |
724 | return -ENOMEM; |
725 | |
726 | pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; |
727 | pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; |
728 | pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; |
729 | pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; |
730 | pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; |
731 | pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; |
732 | pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; |
733 | #endif |
734 | return 0; |
735 | } |
736 | |
737 | static int sctp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn, |
738 | struct sctp_net *sn) |
739 | { |
740 | #ifdef CONFIG_SYSCTL |
741 | #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT |
742 | pn->ctl_compat_table = kmemdup(sctp_compat_sysctl_table, |
743 | sizeof(sctp_compat_sysctl_table), |
744 | GFP_KERNEL); |
745 | if (!pn->ctl_compat_table) |
746 | return -ENOMEM; |
747 | |
748 | pn->ctl_compat_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED]; |
749 | pn->ctl_compat_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT]; |
750 | pn->ctl_compat_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED]; |
751 | pn->ctl_compat_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED]; |
752 | pn->ctl_compat_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT]; |
753 | pn->ctl_compat_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD]; |
754 | pn->ctl_compat_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT]; |
755 | #endif |
756 | #endif |
757 | return 0; |
758 | } |
759 | |
760 | static int sctp_init_net(struct net *net, u_int16_t proto) |
761 | { |
762 | int ret; |
763 | struct sctp_net *sn = sctp_pernet(net); |
764 | struct nf_proto_net *pn = &sn->pn; |
765 | |
766 | if (!pn->users) { |
767 | int i; |
768 | |
769 | for (i = 0; i < SCTP_CONNTRACK_MAX; i++) |
770 | sn->timeouts[i] = sctp_timeouts[i]; |
771 | } |
772 | |
773 | if (proto == AF_INET) { |
774 | ret = sctp_kmemdup_compat_sysctl_table(pn, sn); |
775 | if (ret < 0) |
776 | return ret; |
777 | |
778 | ret = sctp_kmemdup_sysctl_table(pn, sn); |
779 | if (ret < 0) |
780 | nf_ct_kfree_compat_sysctl_table(pn); |
781 | } else |
782 | ret = sctp_kmemdup_sysctl_table(pn, sn); |
783 | |
784 | return ret; |
785 | } |
786 | |
787 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { |
788 | .l3proto = PF_INET, |
789 | .l4proto = IPPROTO_SCTP, |
790 | .name = "sctp", |
791 | .pkt_to_tuple = sctp_pkt_to_tuple, |
792 | .invert_tuple = sctp_invert_tuple, |
793 | .print_tuple = sctp_print_tuple, |
794 | .print_conntrack = sctp_print_conntrack, |
795 | .packet = sctp_packet, |
796 | .get_timeouts = sctp_get_timeouts, |
797 | .new = sctp_new, |
798 | .me = THIS_MODULE, |
799 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
800 | .to_nlattr = sctp_to_nlattr, |
801 | .nlattr_size = sctp_nlattr_size, |
802 | .from_nlattr = nlattr_to_sctp, |
803 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
804 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
805 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
806 | .nla_policy = nf_ct_port_nla_policy, |
807 | #endif |
808 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
809 | .ctnl_timeout = { |
810 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, |
811 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, |
812 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, |
813 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, |
814 | .nla_policy = sctp_timeout_nla_policy, |
815 | }, |
816 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
817 | .net_id = &sctp_net_id, |
818 | .init_net = sctp_init_net, |
819 | }; |
820 | |
821 | static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { |
822 | .l3proto = PF_INET6, |
823 | .l4proto = IPPROTO_SCTP, |
824 | .name = "sctp", |
825 | .pkt_to_tuple = sctp_pkt_to_tuple, |
826 | .invert_tuple = sctp_invert_tuple, |
827 | .print_tuple = sctp_print_tuple, |
828 | .print_conntrack = sctp_print_conntrack, |
829 | .packet = sctp_packet, |
830 | .get_timeouts = sctp_get_timeouts, |
831 | .new = sctp_new, |
832 | .me = THIS_MODULE, |
833 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
834 | .to_nlattr = sctp_to_nlattr, |
835 | .nlattr_size = sctp_nlattr_size, |
836 | .from_nlattr = nlattr_to_sctp, |
837 | .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, |
838 | .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, |
839 | .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, |
840 | .nla_policy = nf_ct_port_nla_policy, |
841 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
842 | .ctnl_timeout = { |
843 | .nlattr_to_obj = sctp_timeout_nlattr_to_obj, |
844 | .obj_to_nlattr = sctp_timeout_obj_to_nlattr, |
845 | .nlattr_max = CTA_TIMEOUT_SCTP_MAX, |
846 | .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX, |
847 | .nla_policy = sctp_timeout_nla_policy, |
848 | }, |
849 | #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
850 | #endif |
851 | .net_id = &sctp_net_id, |
852 | .init_net = sctp_init_net, |
853 | }; |
854 | |
855 | static int sctp_net_init(struct net *net) |
856 | { |
857 | int ret = 0; |
858 | |
859 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp4); |
860 | if (ret < 0) { |
861 | pr_err("nf_conntrack_sctp4: pernet registration failed.\n"); |
862 | goto out; |
863 | } |
864 | ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp6); |
865 | if (ret < 0) { |
866 | pr_err("nf_conntrack_sctp6: pernet registration failed.\n"); |
867 | goto cleanup_sctp4; |
868 | } |
869 | return 0; |
870 | |
871 | cleanup_sctp4: |
872 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); |
873 | out: |
874 | return ret; |
875 | } |
876 | |
877 | static void sctp_net_exit(struct net *net) |
878 | { |
879 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp6); |
880 | nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4); |
881 | } |
882 | |
883 | static struct pernet_operations sctp_net_ops = { |
884 | .init = sctp_net_init, |
885 | .exit = sctp_net_exit, |
886 | .id = &sctp_net_id, |
887 | .size = sizeof(struct sctp_net), |
888 | }; |
889 | |
890 | static int __init nf_conntrack_proto_sctp_init(void) |
891 | { |
892 | int ret; |
893 | |
894 | ret = register_pernet_subsys(&sctp_net_ops); |
895 | if (ret < 0) |
896 | goto out_pernet; |
897 | |
898 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4); |
899 | if (ret < 0) |
900 | goto out_sctp4; |
901 | |
902 | ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6); |
903 | if (ret < 0) |
904 | goto out_sctp6; |
905 | |
906 | return 0; |
907 | out_sctp6: |
908 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
909 | out_sctp4: |
910 | unregister_pernet_subsys(&sctp_net_ops); |
911 | out_pernet: |
912 | return ret; |
913 | } |
914 | |
915 | static void __exit nf_conntrack_proto_sctp_fini(void) |
916 | { |
917 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6); |
918 | nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4); |
919 | unregister_pernet_subsys(&sctp_net_ops); |
920 | } |
921 | |
922 | module_init(nf_conntrack_proto_sctp_init); |
923 | module_exit(nf_conntrack_proto_sctp_fini); |
924 | |
925 | MODULE_LICENSE("GPL"); |
926 | MODULE_AUTHOR("Kiran Kumar Immidi"); |
927 | MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); |
928 | MODULE_ALIAS("ip_conntrack_proto_sctp"); |
929 |
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