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qtnfmac: do not cache CSA chandef info
[linux-2.6/btrfs-unstable.git] / net / netfilter / nf_conntrack_proto_sctp.c
blob6303a88af12b0b5116b9808ac9c0ac370bcb33e6
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/in.h>
19 #include <linux/ip.h>
20 #include <linux/sctp.h>
21 #include <linux/string.h>
22 #include <linux/seq_file.h>
23 #include <linux/spinlock.h>
24 #include <linux/interrupt.h>
25 #include <net/sctp/checksum.h>
26
27 #include <net/netfilter/nf_log.h>
28 #include <net/netfilter/nf_conntrack.h>
29 #include <net/netfilter/nf_conntrack_l4proto.h>
30 #include <net/netfilter/nf_conntrack_ecache.h>
31
32 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
33 closely. They're more complex. --RR
34
35 And so for me for SCTP :D -Kiran */
36
37 static const char *const sctp_conntrack_names[] = {
38 "NONE",
39 "CLOSED",
40 "COOKIE_WAIT",
41 "COOKIE_ECHOED",
42 "ESTABLISHED",
43 "SHUTDOWN_SENT",
44 "SHUTDOWN_RECD",
45 "SHUTDOWN_ACK_SENT",
46 "HEARTBEAT_SENT",
47 "HEARTBEAT_ACKED",
48 };
49
50 #define SECS * HZ
51 #define MINS * 60 SECS
52 #define HOURS * 60 MINS
53 #define DAYS * 24 HOURS
54
55 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
56 [SCTP_CONNTRACK_CLOSED] = 10 SECS,
57 [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
58 [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
59 [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
60 [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
61 [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
62 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
63 [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
64 [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
65 };
66
67 #define sNO SCTP_CONNTRACK_NONE
68 #define sCL SCTP_CONNTRACK_CLOSED
69 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
70 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
71 #define sES SCTP_CONNTRACK_ESTABLISHED
72 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
73 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
74 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
75 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
76 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
77 #define sIV SCTP_CONNTRACK_MAX
78
79 /*
80 These are the descriptions of the states:
81
82 NOTE: These state names are tantalizingly similar to the states of an
83 SCTP endpoint. But the interpretation of the states is a little different,
84 considering that these are the states of the connection and not of an end
85 point. Please note the subtleties. -Kiran
86
87 NONE - Nothing so far.
88 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
89 an INIT_ACK chunk in the reply direction.
90 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
91 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
92 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
93 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
94 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
95 to that of the SHUTDOWN chunk.
96 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
97 the SHUTDOWN chunk. Connection is closed.
98 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
99 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
100 that of the HEARTBEAT chunk. Secondary connection is
101 established.
102 */
103
104 /* TODO
105 - I have assumed that the first INIT is in the original direction.
106 This messes things when an INIT comes in the reply direction in CLOSED
107 state.
108 - Check the error type in the reply dir before transitioning from
109 cookie echoed to closed.
110 - Sec 5.2.4 of RFC 2960
111 - Full Multi Homing support.
112 */
113
114 /* SCTP conntrack state transitions */
115 static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
116 {
117 /* ORIGINAL */
118 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
119 /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
120 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
121 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
122 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
123 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
124 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
125 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
126 /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
127 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
128 /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
129 /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
130 },
131 {
132 /* REPLY */
133 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
134 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
135 /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
136 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
137 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
138 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
139 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
140 /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
141 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
142 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
143 /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
144 /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
145 }
146 };
147
148 static inline struct nf_sctp_net *sctp_pernet(struct net *net)
149 {
150 return &net->ct.nf_ct_proto.sctp;
151 }
152
153 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
154 struct net *net, struct nf_conntrack_tuple *tuple)
155 {
156 const struct sctphdr *hp;
157 struct sctphdr _hdr;
158
159 /* Actually only need first 4 bytes to get ports. */
160 hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
161 if (hp == NULL)
162 return false;
163
164 tuple->src.u.sctp.port = hp->source;
165 tuple->dst.u.sctp.port = hp->dest;
166 return true;
167 }
168
169 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
170 const struct nf_conntrack_tuple *orig)
171 {
172 tuple->src.u.sctp.port = orig->dst.u.sctp.port;
173 tuple->dst.u.sctp.port = orig->src.u.sctp.port;
174 return true;
175 }
176
177 #ifdef CONFIG_NF_CONNTRACK_PROCFS
178 /* Print out the private part of the conntrack. */
179 static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
180 {
181 seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
182 }
183 #endif
184
185 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
186 for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \
187 (offset) < (skb)->len && \
188 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
189 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
190
191 /* Some validity checks to make sure the chunks are fine */
192 static int do_basic_checks(struct nf_conn *ct,
193 const struct sk_buff *skb,
194 unsigned int dataoff,
195 unsigned long *map)
196 {
197 u_int32_t offset, count;
198 struct sctp_chunkhdr _sch, *sch;
199 int flag;
200
201 flag = 0;
202
203 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
204 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
205
206 if (sch->type == SCTP_CID_INIT ||
207 sch->type == SCTP_CID_INIT_ACK ||
208 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
209 flag = 1;
210
211 /*
212 * Cookie Ack/Echo chunks not the first OR
213 * Init / Init Ack / Shutdown compl chunks not the only chunks
214 * OR zero-length.
215 */
216 if (((sch->type == SCTP_CID_COOKIE_ACK ||
217 sch->type == SCTP_CID_COOKIE_ECHO ||
218 flag) &&
219 count != 0) || !sch->length) {
220 pr_debug("Basic checks failed\n");
221 return 1;
222 }
223
224 if (map)
225 set_bit(sch->type, map);
226 }
227
228 pr_debug("Basic checks passed\n");
229 return count == 0;
230 }
231
232 static int sctp_new_state(enum ip_conntrack_dir dir,
233 enum sctp_conntrack cur_state,
234 int chunk_type)
235 {
236 int i;
237
238 pr_debug("Chunk type: %d\n", chunk_type);
239
240 switch (chunk_type) {
241 case SCTP_CID_INIT:
242 pr_debug("SCTP_CID_INIT\n");
243 i = 0;
244 break;
245 case SCTP_CID_INIT_ACK:
246 pr_debug("SCTP_CID_INIT_ACK\n");
247 i = 1;
248 break;
249 case SCTP_CID_ABORT:
250 pr_debug("SCTP_CID_ABORT\n");
251 i = 2;
252 break;
253 case SCTP_CID_SHUTDOWN:
254 pr_debug("SCTP_CID_SHUTDOWN\n");
255 i = 3;
256 break;
257 case SCTP_CID_SHUTDOWN_ACK:
258 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
259 i = 4;
260 break;
261 case SCTP_CID_ERROR:
262 pr_debug("SCTP_CID_ERROR\n");
263 i = 5;
264 break;
265 case SCTP_CID_COOKIE_ECHO:
266 pr_debug("SCTP_CID_COOKIE_ECHO\n");
267 i = 6;
268 break;
269 case SCTP_CID_COOKIE_ACK:
270 pr_debug("SCTP_CID_COOKIE_ACK\n");
271 i = 7;
272 break;
273 case SCTP_CID_SHUTDOWN_COMPLETE:
274 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
275 i = 8;
276 break;
277 case SCTP_CID_HEARTBEAT:
278 pr_debug("SCTP_CID_HEARTBEAT");
279 i = 9;
280 break;
281 case SCTP_CID_HEARTBEAT_ACK:
282 pr_debug("SCTP_CID_HEARTBEAT_ACK");
283 i = 10;
284 break;
285 default:
286 /* Other chunks like DATA or SACK do not change the state */
287 pr_debug("Unknown chunk type, Will stay in %s\n",
288 sctp_conntrack_names[cur_state]);
289 return cur_state;
290 }
291
292 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
293 dir, sctp_conntrack_names[cur_state], chunk_type,
294 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
295
296 return sctp_conntracks[dir][i][cur_state];
297 }
298
299 static unsigned int *sctp_get_timeouts(struct net *net)
300 {
301 return sctp_pernet(net)->timeouts;
302 }
303
304 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
305 static int sctp_packet(struct nf_conn *ct,
306 const struct sk_buff *skb,
307 unsigned int dataoff,
308 enum ip_conntrack_info ctinfo,
309 u_int8_t pf,
310 unsigned int *timeouts)
311 {
312 enum sctp_conntrack new_state, old_state;
313 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
314 const struct sctphdr *sh;
315 struct sctphdr _sctph;
316 const struct sctp_chunkhdr *sch;
317 struct sctp_chunkhdr _sch;
318 u_int32_t offset, count;
319 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
320
321 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
322 if (sh == NULL)
323 goto out;
324
325 if (do_basic_checks(ct, skb, dataoff, map) != 0)
326 goto out;
327
328 /* Check the verification tag (Sec 8.5) */
329 if (!test_bit(SCTP_CID_INIT, map) &&
330 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
331 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
332 !test_bit(SCTP_CID_ABORT, map) &&
333 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
334 !test_bit(SCTP_CID_HEARTBEAT, map) &&
335 !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
336 sh->vtag != ct->proto.sctp.vtag[dir]) {
337 pr_debug("Verification tag check failed\n");
338 goto out;
339 }
340
341 old_state = new_state = SCTP_CONNTRACK_NONE;
342 spin_lock_bh(&ct->lock);
343 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
344 /* Special cases of Verification tag check (Sec 8.5.1) */
345 if (sch->type == SCTP_CID_INIT) {
346 /* Sec 8.5.1 (A) */
347 if (sh->vtag != 0)
348 goto out_unlock;
349 } else if (sch->type == SCTP_CID_ABORT) {
350 /* Sec 8.5.1 (B) */
351 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
352 sh->vtag != ct->proto.sctp.vtag[!dir])
353 goto out_unlock;
354 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
355 /* Sec 8.5.1 (C) */
356 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
357 sh->vtag != ct->proto.sctp.vtag[!dir] &&
358 sch->flags & SCTP_CHUNK_FLAG_T)
359 goto out_unlock;
360 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
361 /* Sec 8.5.1 (D) */
362 if (sh->vtag != ct->proto.sctp.vtag[dir])
363 goto out_unlock;
364 } else if (sch->type == SCTP_CID_HEARTBEAT ||
365 sch->type == SCTP_CID_HEARTBEAT_ACK) {
366 if (ct->proto.sctp.vtag[dir] == 0) {
367 pr_debug("Setting vtag %x for dir %d\n",
368 sh->vtag, dir);
369 ct->proto.sctp.vtag[dir] = sh->vtag;
370 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
371 pr_debug("Verification tag check failed\n");
372 goto out_unlock;
373 }
374 }
375
376 old_state = ct->proto.sctp.state;
377 new_state = sctp_new_state(dir, old_state, sch->type);
378
379 /* Invalid */
380 if (new_state == SCTP_CONNTRACK_MAX) {
381 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
382 "conntrack=%u\n",
383 dir, sch->type, old_state);
384 goto out_unlock;
385 }
386
387 /* If it is an INIT or an INIT ACK note down the vtag */
388 if (sch->type == SCTP_CID_INIT ||
389 sch->type == SCTP_CID_INIT_ACK) {
390 struct sctp_inithdr _inithdr, *ih;
391
392 ih = skb_header_pointer(skb, offset + sizeof(_sch),
393 sizeof(_inithdr), &_inithdr);
394 if (ih == NULL)
395 goto out_unlock;
396 pr_debug("Setting vtag %x for dir %d\n",
397 ih->init_tag, !dir);
398 ct->proto.sctp.vtag[!dir] = ih->init_tag;
399 }
400
401 ct->proto.sctp.state = new_state;
402 if (old_state != new_state)
403 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
404 }
405 spin_unlock_bh(&ct->lock);
406
407 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
408
409 if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
410 dir == IP_CT_DIR_REPLY &&
411 new_state == SCTP_CONNTRACK_ESTABLISHED) {
412 pr_debug("Setting assured bit\n");
413 set_bit(IPS_ASSURED_BIT, &ct->status);
414 nf_conntrack_event_cache(IPCT_ASSURED, ct);
415 }
416
417 return NF_ACCEPT;
418
419 out_unlock:
420 spin_unlock_bh(&ct->lock);
421 out:
422 return -NF_ACCEPT;
423 }
424
425 /* Called when a new connection for this protocol found. */
426 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
427 unsigned int dataoff, unsigned int *timeouts)
428 {
429 enum sctp_conntrack new_state;
430 const struct sctphdr *sh;
431 struct sctphdr _sctph;
432 const struct sctp_chunkhdr *sch;
433 struct sctp_chunkhdr _sch;
434 u_int32_t offset, count;
435 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
436
437 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
438 if (sh == NULL)
439 return false;
440
441 if (do_basic_checks(ct, skb, dataoff, map) != 0)
442 return false;
443
444 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
445 if (test_bit(SCTP_CID_ABORT, map) ||
446 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
447 test_bit(SCTP_CID_COOKIE_ACK, map))
448 return false;
449
450 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
451 new_state = SCTP_CONNTRACK_MAX;
452 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
453 /* Don't need lock here: this conntrack not in circulation yet */
454 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
455 SCTP_CONNTRACK_NONE, sch->type);
456
457 /* Invalid: delete conntrack */
458 if (new_state == SCTP_CONNTRACK_NONE ||
459 new_state == SCTP_CONNTRACK_MAX) {
460 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
461 return false;
462 }
463
464 /* Copy the vtag into the state info */
465 if (sch->type == SCTP_CID_INIT) {
466 struct sctp_inithdr _inithdr, *ih;
467 /* Sec 8.5.1 (A) */
468 if (sh->vtag)
469 return false;
470
471 ih = skb_header_pointer(skb, offset + sizeof(_sch),
472 sizeof(_inithdr), &_inithdr);
473 if (!ih)
474 return false;
475
476 pr_debug("Setting vtag %x for new conn\n",
477 ih->init_tag);
478
479 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag;
480 } else if (sch->type == SCTP_CID_HEARTBEAT) {
481 pr_debug("Setting vtag %x for secondary conntrack\n",
482 sh->vtag);
483 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
484 }
485 /* If it is a shutdown ack OOTB packet, we expect a return
486 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
487 else {
488 pr_debug("Setting vtag %x for new conn OOTB\n",
489 sh->vtag);
490 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
491 }
492
493 ct->proto.sctp.state = new_state;
494 }
495
496 return true;
497 }
498
499 static int sctp_error(struct net *net, struct nf_conn *tpl, struct sk_buff *skb,
500 unsigned int dataoff,
501 u8 pf, unsigned int hooknum)
502 {
503 const struct sctphdr *sh;
504 const char *logmsg;
505
506 if (skb->len < dataoff + sizeof(struct sctphdr)) {
507 logmsg = "nf_ct_sctp: short packet ";
508 goto out_invalid;
509 }
510 if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
511 skb->ip_summed == CHECKSUM_NONE) {
512 if (!skb_make_writable(skb, dataoff + sizeof(struct sctphdr))) {
513 logmsg = "nf_ct_sctp: failed to read header ";
514 goto out_invalid;
515 }
516 sh = (const struct sctphdr *)(skb->data + dataoff);
517 if (sh->checksum != sctp_compute_cksum(skb, dataoff)) {
518 logmsg = "nf_ct_sctp: bad CRC ";
519 goto out_invalid;
520 }
521 skb->ip_summed = CHECKSUM_UNNECESSARY;
522 }
523 return NF_ACCEPT;
524 out_invalid:
525 if (LOG_INVALID(net, IPPROTO_SCTP))
526 nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", logmsg);
527 return -NF_ACCEPT;
528 }
529
530 static bool sctp_can_early_drop(const struct nf_conn *ct)
531 {
532 switch (ct->proto.sctp.state) {
533 case SCTP_CONNTRACK_SHUTDOWN_SENT:
534 case SCTP_CONNTRACK_SHUTDOWN_RECD:
535 case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT:
536 return true;
537 default:
538 break;
539 }
540
541 return false;
542 }
543
544 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
545
546 #include <linux/netfilter/nfnetlink.h>
547 #include <linux/netfilter/nfnetlink_conntrack.h>
548
549 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
550 struct nf_conn *ct)
551 {
552 struct nlattr *nest_parms;
553
554 spin_lock_bh(&ct->lock);
555 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
556 if (!nest_parms)
557 goto nla_put_failure;
558
559 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
560 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
561 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
562 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
563 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
564 goto nla_put_failure;
565
566 spin_unlock_bh(&ct->lock);
567
568 nla_nest_end(skb, nest_parms);
569
570 return 0;
571
572 nla_put_failure:
573 spin_unlock_bh(&ct->lock);
574 return -1;
575 }
576
577 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
578 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
579 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
580 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
581 };
582
583 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
584 {
585 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
586 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
587 int err;
588
589 /* updates may not contain the internal protocol info, skip parsing */
590 if (!attr)
591 return 0;
592
593 err = nla_parse_nested(tb, CTA_PROTOINFO_SCTP_MAX, attr,
594 sctp_nla_policy, NULL);
595 if (err < 0)
596 return err;
597
598 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
599 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
600 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
601 return -EINVAL;
602
603 spin_lock_bh(&ct->lock);
604 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
605 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
606 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
607 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
608 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
609 spin_unlock_bh(&ct->lock);
610
611 return 0;
612 }
613
614 static int sctp_nlattr_size(void)
615 {
616 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
617 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
618 }
619 #endif
620
621 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
622
623 #include <linux/netfilter/nfnetlink.h>
624 #include <linux/netfilter/nfnetlink_cttimeout.h>
625
626 static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
627 struct net *net, void *data)
628 {
629 unsigned int *timeouts = data;
630 struct nf_sctp_net *sn = sctp_pernet(net);
631 int i;
632
633 /* set default SCTP timeouts. */
634 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
635 timeouts[i] = sn->timeouts[i];
636
637 /* there's a 1:1 mapping between attributes and protocol states. */
638 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
639 if (tb[i]) {
640 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
641 }
642 }
643 return 0;
644 }
645
646 static int
647 sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
648 {
649 const unsigned int *timeouts = data;
650 int i;
651
652 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
653 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
654 goto nla_put_failure;
655 }
656 return 0;
657
658 nla_put_failure:
659 return -ENOSPC;
660 }
661
662 static const struct nla_policy
663 sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
664 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
665 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
666 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
667 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
668 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
669 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
670 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
671 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
672 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
673 };
674 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
675
676
677 #ifdef CONFIG_SYSCTL
678 static struct ctl_table sctp_sysctl_table[] = {
679 {
680 .procname = "nf_conntrack_sctp_timeout_closed",
681 .maxlen = sizeof(unsigned int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec_jiffies,
684 },
685 {
686 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
687 .maxlen = sizeof(unsigned int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec_jiffies,
690 },
691 {
692 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
693 .maxlen = sizeof(unsigned int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec_jiffies,
696 },
697 {
698 .procname = "nf_conntrack_sctp_timeout_established",
699 .maxlen = sizeof(unsigned int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_jiffies,
702 },
703 {
704 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
705 .maxlen = sizeof(unsigned int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec_jiffies,
708 },
709 {
710 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
711 .maxlen = sizeof(unsigned int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec_jiffies,
714 },
715 {
716 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
717 .maxlen = sizeof(unsigned int),
718 .mode = 0644,
719 .proc_handler = proc_dointvec_jiffies,
720 },
721 {
722 .procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
723 .maxlen = sizeof(unsigned int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec_jiffies,
726 },
727 {
728 .procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
729 .maxlen = sizeof(unsigned int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_jiffies,
732 },
733 { }
734 };
735 #endif
736
737 static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn,
738 struct nf_sctp_net *sn)
739 {
740 #ifdef CONFIG_SYSCTL
741 if (pn->ctl_table)
742 return 0;
743
744 pn->ctl_table = kmemdup(sctp_sysctl_table,
745 sizeof(sctp_sysctl_table),
746 GFP_KERNEL);
747 if (!pn->ctl_table)
748 return -ENOMEM;
749
750 pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
751 pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
752 pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
753 pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
754 pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
755 pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
756 pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
757 pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT];
758 pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED];
759 #endif
760 return 0;
761 }
762
763 static int sctp_init_net(struct net *net, u_int16_t proto)
764 {
765 struct nf_sctp_net *sn = sctp_pernet(net);
766 struct nf_proto_net *pn = &sn->pn;
767
768 if (!pn->users) {
769 int i;
770
771 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
772 sn->timeouts[i] = sctp_timeouts[i];
773 }
774
775 return sctp_kmemdup_sysctl_table(pn, sn);
776 }
777
778 static struct nf_proto_net *sctp_get_net_proto(struct net *net)
779 {
780 return &net->ct.nf_ct_proto.sctp.pn;
781 }
782
783 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
784 .l3proto = PF_INET,
785 .l4proto = IPPROTO_SCTP,
786 .pkt_to_tuple = sctp_pkt_to_tuple,
787 .invert_tuple = sctp_invert_tuple,
788 #ifdef CONFIG_NF_CONNTRACK_PROCFS
789 .print_conntrack = sctp_print_conntrack,
790 #endif
791 .packet = sctp_packet,
792 .get_timeouts = sctp_get_timeouts,
793 .new = sctp_new,
794 .error = sctp_error,
795 .can_early_drop = sctp_can_early_drop,
796 .me = THIS_MODULE,
797 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
798 .to_nlattr = sctp_to_nlattr,
799 .nlattr_size = sctp_nlattr_size,
800 .from_nlattr = nlattr_to_sctp,
801 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
802 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
803 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
804 .nla_policy = nf_ct_port_nla_policy,
805 #endif
806 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
807 .ctnl_timeout = {
808 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
809 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
810 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
811 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
812 .nla_policy = sctp_timeout_nla_policy,
813 },
814 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
815 .init_net = sctp_init_net,
816 .get_net_proto = sctp_get_net_proto,
817 };
818 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp4);
819
820 struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
821 .l3proto = PF_INET6,
822 .l4proto = IPPROTO_SCTP,
823 .pkt_to_tuple = sctp_pkt_to_tuple,
824 .invert_tuple = sctp_invert_tuple,
825 #ifdef CONFIG_NF_CONNTRACK_PROCFS
826 .print_conntrack = sctp_print_conntrack,
827 #endif
828 .packet = sctp_packet,
829 .get_timeouts = sctp_get_timeouts,
830 .new = sctp_new,
831 .error = sctp_error,
832 .can_early_drop = sctp_can_early_drop,
833 .me = THIS_MODULE,
834 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
835 .to_nlattr = sctp_to_nlattr,
836 .nlattr_size = sctp_nlattr_size,
837 .from_nlattr = nlattr_to_sctp,
838 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
839 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
840 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
841 .nla_policy = nf_ct_port_nla_policy,
842 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
843 .ctnl_timeout = {
844 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
845 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
846 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
847 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
848 .nla_policy = sctp_timeout_nla_policy,
849 },
850 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
851 #endif
852 .init_net = sctp_init_net,
853 .get_net_proto = sctp_get_net_proto,
854 };
855 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp6);
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