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netfilter: nf_ct_helper: implement variable length helper private data
[linux-block.git] / net / netfilter / nf_conntrack_proto_sctp.c
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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
33static 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
49static 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
72NOTE: These state names are tantalizingly similar to the states of an
73SCTP endpoint. But the interpretation of the states is a little different,
74considering that these are the states of the connection and not of an end
75point. Please note the subtleties. -Kiran
76
77NONE - Nothing so far.
78COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
79 an INIT_ACK chunk in the reply direction.
80COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
81ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
82SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
83SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
84SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
85 to that of the SHUTDOWN chunk.
86CLOSED - 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
95cookie echoed to closed.
96 - Sec 5.2.4 of RFC 2960
97 - Multi Homing support.
98*/
99
100/* SCTP conntrack state transitions */
101static 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},/* Can't 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},/* Can't 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},/* Can't 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
130static int sctp_net_id __read_mostly;
131struct sctp_net {
132 struct nf_proto_net pn;
133 unsigned int timeouts[SCTP_CONNTRACK_MAX];
134};
135
136static inline struct sctp_net *sctp_pernet(struct net *net)
137{
138 return net_generic(net, sctp_net_id);
139}
140
141static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
142 struct nf_conntrack_tuple *tuple)
143{
144 const struct sctphdr *hp;
145 struct sctphdr _hdr;
146
147 /* Actually only need first 8 bytes. */
148 hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
149 if (hp == NULL)
150 return false;
151
152 tuple->src.u.sctp.port = hp->source;
153 tuple->dst.u.sctp.port = hp->dest;
154 return true;
155}
156
157static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
158 const struct nf_conntrack_tuple *orig)
159{
160 tuple->src.u.sctp.port = orig->dst.u.sctp.port;
161 tuple->dst.u.sctp.port = orig->src.u.sctp.port;
162 return true;
163}
164
165/* Print out the per-protocol part of the tuple. */
166static int sctp_print_tuple(struct seq_file *s,
167 const struct nf_conntrack_tuple *tuple)
168{
169 return seq_printf(s, "sport=%hu dport=%hu ",
170 ntohs(tuple->src.u.sctp.port),
171 ntohs(tuple->dst.u.sctp.port));
172}
173
174/* Print out the private part of the conntrack. */
175static int sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
176{
177 enum sctp_conntrack state;
178
179 spin_lock_bh(&ct->lock);
180 state = ct->proto.sctp.state;
181 spin_unlock_bh(&ct->lock);
182
183 return seq_printf(s, "%s ", sctp_conntrack_names[state]);
184}
185
186#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
187for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
188 (offset) < (skb)->len && \
189 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
190 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
191
192/* Some validity checks to make sure the chunks are fine */
193static int do_basic_checks(struct nf_conn *ct,
194 const struct sk_buff *skb,
195 unsigned int dataoff,
196 unsigned long *map)
197{
198 u_int32_t offset, count;
199 sctp_chunkhdr_t _sch, *sch;
200 int flag;
201
202 flag = 0;
203
204 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
205 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
206
207 if (sch->type == SCTP_CID_INIT ||
208 sch->type == SCTP_CID_INIT_ACK ||
209 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
210 flag = 1;
211
212 /*
213 * Cookie Ack/Echo chunks not the first OR
214 * Init / Init Ack / Shutdown compl chunks not the only chunks
215 * OR zero-length.
216 */
217 if (((sch->type == SCTP_CID_COOKIE_ACK ||
218 sch->type == SCTP_CID_COOKIE_ECHO ||
219 flag) &&
220 count != 0) || !sch->length) {
221 pr_debug("Basic checks failed\n");
222 return 1;
223 }
224
225 if (map)
226 set_bit(sch->type, map);
227 }
228
229 pr_debug("Basic checks passed\n");
230 return count == 0;
231}
232
233static int sctp_new_state(enum ip_conntrack_dir dir,
234 enum sctp_conntrack cur_state,
235 int chunk_type)
236{
237 int i;
238
239 pr_debug("Chunk type: %d\n", chunk_type);
240
241 switch (chunk_type) {
242 case SCTP_CID_INIT:
243 pr_debug("SCTP_CID_INIT\n");
244 i = 0;
245 break;
246 case SCTP_CID_INIT_ACK:
247 pr_debug("SCTP_CID_INIT_ACK\n");
248 i = 1;
249 break;
250 case SCTP_CID_ABORT:
251 pr_debug("SCTP_CID_ABORT\n");
252 i = 2;
253 break;
254 case SCTP_CID_SHUTDOWN:
255 pr_debug("SCTP_CID_SHUTDOWN\n");
256 i = 3;
257 break;
258 case SCTP_CID_SHUTDOWN_ACK:
259 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
260 i = 4;
261 break;
262 case SCTP_CID_ERROR:
263 pr_debug("SCTP_CID_ERROR\n");
264 i = 5;
265 break;
266 case SCTP_CID_COOKIE_ECHO:
267 pr_debug("SCTP_CID_COOKIE_ECHO\n");
268 i = 6;
269 break;
270 case SCTP_CID_COOKIE_ACK:
271 pr_debug("SCTP_CID_COOKIE_ACK\n");
272 i = 7;
273 break;
274 case SCTP_CID_SHUTDOWN_COMPLETE:
275 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
276 i = 8;
277 break;
278 default:
279 /* Other chunks like DATA, SACK, HEARTBEAT and
280 its ACK do not cause a change in state */
281 pr_debug("Unknown chunk type, Will stay in %s\n",
282 sctp_conntrack_names[cur_state]);
283 return cur_state;
284 }
285
286 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
287 dir, sctp_conntrack_names[cur_state], chunk_type,
288 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
289
290 return sctp_conntracks[dir][i][cur_state];
291}
292
293static unsigned int *sctp_get_timeouts(struct net *net)
294{
295 return sctp_pernet(net)->timeouts;
296}
297
298/* Returns verdict for packet, or -NF_ACCEPT for invalid. */
299static int sctp_packet(struct nf_conn *ct,
300 const struct sk_buff *skb,
301 unsigned int dataoff,
302 enum ip_conntrack_info ctinfo,
303 u_int8_t pf,
304 unsigned int hooknum,
305 unsigned int *timeouts)
306{
307 enum sctp_conntrack new_state, old_state;
308 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
309 const struct sctphdr *sh;
310 struct sctphdr _sctph;
311 const struct sctp_chunkhdr *sch;
312 struct sctp_chunkhdr _sch;
313 u_int32_t offset, count;
314 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
315
316 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
317 if (sh == NULL)
318 goto out;
319
320 if (do_basic_checks(ct, skb, dataoff, map) != 0)
321 goto out;
322
323 /* Check the verification tag (Sec 8.5) */
324 if (!test_bit(SCTP_CID_INIT, map) &&
325 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
326 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
327 !test_bit(SCTP_CID_ABORT, map) &&
328 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
329 sh->vtag != ct->proto.sctp.vtag[dir]) {
330 pr_debug("Verification tag check failed\n");
331 goto out;
332 }
333
334 old_state = new_state = SCTP_CONNTRACK_NONE;
335 spin_lock_bh(&ct->lock);
336 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
337 /* Special cases of Verification tag check (Sec 8.5.1) */
338 if (sch->type == SCTP_CID_INIT) {
339 /* Sec 8.5.1 (A) */
340 if (sh->vtag != 0)
341 goto out_unlock;
342 } else if (sch->type == SCTP_CID_ABORT) {
343 /* Sec 8.5.1 (B) */
344 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
345 sh->vtag != ct->proto.sctp.vtag[!dir])
346 goto out_unlock;
347 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
348 /* Sec 8.5.1 (C) */
349 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
350 sh->vtag != ct->proto.sctp.vtag[!dir] &&
351 sch->flags & SCTP_CHUNK_FLAG_T)
352 goto out_unlock;
353 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
354 /* Sec 8.5.1 (D) */
355 if (sh->vtag != ct->proto.sctp.vtag[dir])
356 goto out_unlock;
357 }
358
359 old_state = ct->proto.sctp.state;
360 new_state = sctp_new_state(dir, old_state, sch->type);
361
362 /* Invalid */
363 if (new_state == SCTP_CONNTRACK_MAX) {
364 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
365 "conntrack=%u\n",
366 dir, sch->type, old_state);
367 goto out_unlock;
368 }
369
370 /* If it is an INIT or an INIT ACK note down the vtag */
371 if (sch->type == SCTP_CID_INIT ||
372 sch->type == SCTP_CID_INIT_ACK) {
373 sctp_inithdr_t _inithdr, *ih;
374
375 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
376 sizeof(_inithdr), &_inithdr);
377 if (ih == NULL)
378 goto out_unlock;
379 pr_debug("Setting vtag %x for dir %d\n",
380 ih->init_tag, !dir);
381 ct->proto.sctp.vtag[!dir] = ih->init_tag;
382 }
383
384 ct->proto.sctp.state = new_state;
385 if (old_state != new_state)
386 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
387 }
388 spin_unlock_bh(&ct->lock);
389
390 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
391
392 if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
393 dir == IP_CT_DIR_REPLY &&
394 new_state == SCTP_CONNTRACK_ESTABLISHED) {
395 pr_debug("Setting assured bit\n");
396 set_bit(IPS_ASSURED_BIT, &ct->status);
397 nf_conntrack_event_cache(IPCT_ASSURED, ct);
398 }
399
400 return NF_ACCEPT;
401
402out_unlock:
403 spin_unlock_bh(&ct->lock);
404out:
405 return -NF_ACCEPT;
406}
407
408/* Called when a new connection for this protocol found. */
409static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
410 unsigned int dataoff, unsigned int *timeouts)
411{
412 enum sctp_conntrack new_state;
413 const struct sctphdr *sh;
414 struct sctphdr _sctph;
415 const struct sctp_chunkhdr *sch;
416 struct sctp_chunkhdr _sch;
417 u_int32_t offset, count;
418 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
419
420 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
421 if (sh == NULL)
422 return false;
423
424 if (do_basic_checks(ct, skb, dataoff, map) != 0)
425 return false;
426
427 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
428 if (test_bit(SCTP_CID_ABORT, map) ||
429 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
430 test_bit(SCTP_CID_COOKIE_ACK, map))
431 return false;
432
433 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
434 new_state = SCTP_CONNTRACK_MAX;
435 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
436 /* Don't need lock here: this conntrack not in circulation yet */
437 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
438 SCTP_CONNTRACK_NONE, sch->type);
439
440 /* Invalid: delete conntrack */
441 if (new_state == SCTP_CONNTRACK_NONE ||
442 new_state == SCTP_CONNTRACK_MAX) {
443 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
444 return false;
445 }
446
447 /* Copy the vtag into the state info */
448 if (sch->type == SCTP_CID_INIT) {
449 if (sh->vtag == 0) {
450 sctp_inithdr_t _inithdr, *ih;
451
452 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
453 sizeof(_inithdr), &_inithdr);
454 if (ih == NULL)
455 return false;
456
457 pr_debug("Setting vtag %x for new conn\n",
458 ih->init_tag);
459
460 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
461 ih->init_tag;
462 } else {
463 /* Sec 8.5.1 (A) */
464 return false;
465 }
466 }
467 /* If it is a shutdown ack OOTB packet, we expect a return
468 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
469 else {
470 pr_debug("Setting vtag %x for new conn OOTB\n",
471 sh->vtag);
472 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
473 }
474
475 ct->proto.sctp.state = new_state;
476 }
477
478 return true;
479}
480
481#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
482
483#include <linux/netfilter/nfnetlink.h>
484#include <linux/netfilter/nfnetlink_conntrack.h>
485
486static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
487 struct nf_conn *ct)
488{
489 struct nlattr *nest_parms;
490
491 spin_lock_bh(&ct->lock);
492 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
493 if (!nest_parms)
494 goto nla_put_failure;
495
496 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
497 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
498 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
499 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
500 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
501 goto nla_put_failure;
502
503 spin_unlock_bh(&ct->lock);
504
505 nla_nest_end(skb, nest_parms);
506
507 return 0;
508
509nla_put_failure:
510 spin_unlock_bh(&ct->lock);
511 return -1;
512}
513
514static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
515 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
516 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
517 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
518};
519
520static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
521{
522 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
523 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
524 int err;
525
526 /* updates may not contain the internal protocol info, skip parsing */
527 if (!attr)
528 return 0;
529
530 err = nla_parse_nested(tb,
531 CTA_PROTOINFO_SCTP_MAX,
532 attr,
533 sctp_nla_policy);
534 if (err < 0)
535 return err;
536
537 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
538 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
539 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
540 return -EINVAL;
541
542 spin_lock_bh(&ct->lock);
543 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
544 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
545 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
546 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
547 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
548 spin_unlock_bh(&ct->lock);
549
550 return 0;
551}
552
553static int sctp_nlattr_size(void)
554{
555 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
556 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
557}
558#endif
559
560#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
561
562#include <linux/netfilter/nfnetlink.h>
563#include <linux/netfilter/nfnetlink_cttimeout.h>
564
565static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
566 struct net *net, void *data)
567{
568 unsigned int *timeouts = data;
569 struct sctp_net *sn = sctp_pernet(net);
570 int i;
571
572 /* set default SCTP timeouts. */
573 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
574 timeouts[i] = sn->timeouts[i];
575
576 /* there's a 1:1 mapping between attributes and protocol states. */
577 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
578 if (tb[i]) {
579 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
580 }
581 }
582 return 0;
583}
584
585static int
586sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
587{
588 const unsigned int *timeouts = data;
589 int i;
590
591 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
592 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
593 goto nla_put_failure;
594 }
595 return 0;
596
597nla_put_failure:
598 return -ENOSPC;
599}
600
601static const struct nla_policy
602sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
603 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
604 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
605 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
606 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
607 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
608 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
609 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
610};
611#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
612
613
614#ifdef CONFIG_SYSCTL
615static struct ctl_table sctp_sysctl_table[] = {
616 {
617 .procname = "nf_conntrack_sctp_timeout_closed",
618 .maxlen = sizeof(unsigned int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_jiffies,
621 },
622 {
623 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
624 .maxlen = sizeof(unsigned int),
625 .mode = 0644,
626 .proc_handler = proc_dointvec_jiffies,
627 },
628 {
629 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
630 .maxlen = sizeof(unsigned int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec_jiffies,
633 },
634 {
635 .procname = "nf_conntrack_sctp_timeout_established",
636 .maxlen = sizeof(unsigned int),
637 .mode = 0644,
638 .proc_handler = proc_dointvec_jiffies,
639 },
640 {
641 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
642 .maxlen = sizeof(unsigned int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec_jiffies,
645 },
646 {
647 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
648 .maxlen = sizeof(unsigned int),
649 .mode = 0644,
650 .proc_handler = proc_dointvec_jiffies,
651 },
652 {
653 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
654 .maxlen = sizeof(unsigned int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec_jiffies,
657 },
658 { }
659};
660
661#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
662static struct ctl_table sctp_compat_sysctl_table[] = {
663 {
664 .procname = "ip_conntrack_sctp_timeout_closed",
665 .maxlen = sizeof(unsigned int),
666 .mode = 0644,
667 .proc_handler = proc_dointvec_jiffies,
668 },
669 {
670 .procname = "ip_conntrack_sctp_timeout_cookie_wait",
671 .maxlen = sizeof(unsigned int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec_jiffies,
674 },
675 {
676 .procname = "ip_conntrack_sctp_timeout_cookie_echoed",
677 .maxlen = sizeof(unsigned int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec_jiffies,
680 },
681 {
682 .procname = "ip_conntrack_sctp_timeout_established",
683 .maxlen = sizeof(unsigned int),
684 .mode = 0644,
685 .proc_handler = proc_dointvec_jiffies,
686 },
687 {
688 .procname = "ip_conntrack_sctp_timeout_shutdown_sent",
689 .maxlen = sizeof(unsigned int),
690 .mode = 0644,
691 .proc_handler = proc_dointvec_jiffies,
692 },
693 {
694 .procname = "ip_conntrack_sctp_timeout_shutdown_recd",
695 .maxlen = sizeof(unsigned int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_jiffies,
698 },
699 {
700 .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
701 .maxlen = sizeof(unsigned int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec_jiffies,
704 },
705 { }
706};
707#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
708#endif
709
710static void sctp_init_net_data(struct sctp_net *sn)
711{
712 int i;
713#ifdef CONFIG_SYSCTL
714 if (!sn->pn.ctl_table) {
715#else
716 if (!sn->pn.users++) {
717#endif
718 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
719 sn->timeouts[i] = sctp_timeouts[i];
720 }
721}
722
723static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn)
724{
725#ifdef CONFIG_SYSCTL
726 struct sctp_net *sn = (struct sctp_net *)pn;
727 if (pn->ctl_table)
728 return 0;
729
730 pn->ctl_table = kmemdup(sctp_sysctl_table,
731 sizeof(sctp_sysctl_table),
732 GFP_KERNEL);
733 if (!pn->ctl_table)
734 return -ENOMEM;
735
736 pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
737 pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
738 pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
739 pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
740 pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
741 pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
742 pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
743#endif
744 return 0;
745}
746
747static int sctp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn)
748{
749#ifdef CONFIG_SYSCTL
750#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
751 struct sctp_net *sn = (struct sctp_net *)pn;
752 pn->ctl_compat_table = kmemdup(sctp_compat_sysctl_table,
753 sizeof(sctp_compat_sysctl_table),
754 GFP_KERNEL);
755 if (!pn->ctl_compat_table)
756 return -ENOMEM;
757
758 pn->ctl_compat_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
759 pn->ctl_compat_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
760 pn->ctl_compat_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
761 pn->ctl_compat_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
762 pn->ctl_compat_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
763 pn->ctl_compat_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
764 pn->ctl_compat_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
765#endif
766#endif
767 return 0;
768}
769
770static int sctpv4_init_net(struct net *net)
771{
772 int ret;
773 struct sctp_net *sn = sctp_pernet(net);
774 struct nf_proto_net *pn = (struct nf_proto_net *)sn;
775
776 sctp_init_net_data(sn);
777
778 ret = sctp_kmemdup_compat_sysctl_table(pn);
779 if (ret < 0)
780 return ret;
781
782 ret = sctp_kmemdup_sysctl_table(pn);
783
784#ifdef CONFIG_SYSCTL
785#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
786 if (ret < 0) {
787
788 kfree(pn->ctl_compat_table);
789 pn->ctl_compat_table = NULL;
790 }
791#endif
792#endif
793 return ret;
794}
795
796static int sctpv6_init_net(struct net *net)
797{
798 struct sctp_net *sn = sctp_pernet(net);
799 struct nf_proto_net *pn = (struct nf_proto_net *)sn;
800
801 sctp_init_net_data(sn);
802 return sctp_kmemdup_sysctl_table(pn);
803}
804
805static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
806 .l3proto = PF_INET,
807 .l4proto = IPPROTO_SCTP,
808 .name = "sctp",
809 .pkt_to_tuple = sctp_pkt_to_tuple,
810 .invert_tuple = sctp_invert_tuple,
811 .print_tuple = sctp_print_tuple,
812 .print_conntrack = sctp_print_conntrack,
813 .packet = sctp_packet,
814 .get_timeouts = sctp_get_timeouts,
815 .new = sctp_new,
816 .me = THIS_MODULE,
817#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
818 .to_nlattr = sctp_to_nlattr,
819 .nlattr_size = sctp_nlattr_size,
820 .from_nlattr = nlattr_to_sctp,
821 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
822 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
823 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
824 .nla_policy = nf_ct_port_nla_policy,
825#endif
826#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
827 .ctnl_timeout = {
828 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
829 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
830 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
831 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
832 .nla_policy = sctp_timeout_nla_policy,
833 },
834#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
835 .net_id = &sctp_net_id,
836 .init_net = sctpv4_init_net,
837};
838
839static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
840 .l3proto = PF_INET6,
841 .l4proto = IPPROTO_SCTP,
842 .name = "sctp",
843 .pkt_to_tuple = sctp_pkt_to_tuple,
844 .invert_tuple = sctp_invert_tuple,
845 .print_tuple = sctp_print_tuple,
846 .print_conntrack = sctp_print_conntrack,
847 .packet = sctp_packet,
848 .get_timeouts = sctp_get_timeouts,
849 .new = sctp_new,
850 .me = THIS_MODULE,
851#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
852 .to_nlattr = sctp_to_nlattr,
853 .nlattr_size = sctp_nlattr_size,
854 .from_nlattr = nlattr_to_sctp,
855 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
856 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
857 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
858 .nla_policy = nf_ct_port_nla_policy,
859#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
860 .ctnl_timeout = {
861 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
862 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
863 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
864 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
865 .nla_policy = sctp_timeout_nla_policy,
866 },
867#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
868#endif
869 .net_id = &sctp_net_id,
870 .init_net = sctpv6_init_net,
871};
872
873static int sctp_net_init(struct net *net)
874{
875 int ret = 0;
876
877 ret = nf_conntrack_l4proto_register(net,
878 &nf_conntrack_l4proto_sctp4);
879 if (ret < 0) {
880 pr_err("nf_conntrack_l4proto_sctp4 :protocol register failed.\n");
881 goto out;
882 }
883 ret = nf_conntrack_l4proto_register(net,
884 &nf_conntrack_l4proto_sctp6);
885 if (ret < 0) {
886 pr_err("nf_conntrack_l4proto_sctp6 :protocol register failed.\n");
887 goto cleanup_sctp4;
888 }
889 return 0;
890
891cleanup_sctp4:
892 nf_conntrack_l4proto_unregister(net,
893 &nf_conntrack_l4proto_sctp4);
894out:
895 return ret;
896}
897
898static void sctp_net_exit(struct net *net)
899{
900 nf_conntrack_l4proto_unregister(net,
901 &nf_conntrack_l4proto_sctp6);
902 nf_conntrack_l4proto_unregister(net,
903 &nf_conntrack_l4proto_sctp4);
904}
905
906static struct pernet_operations sctp_net_ops = {
907 .init = sctp_net_init,
908 .exit = sctp_net_exit,
909 .id = &sctp_net_id,
910 .size = sizeof(struct sctp_net),
911};
912
913static int __init nf_conntrack_proto_sctp_init(void)
914{
915 return register_pernet_subsys(&sctp_net_ops);
916}
917
918static void __exit nf_conntrack_proto_sctp_fini(void)
919{
920 unregister_pernet_subsys(&sctp_net_ops);
921}
922
923module_init(nf_conntrack_proto_sctp_init);
924module_exit(nf_conntrack_proto_sctp_fini);
925
926MODULE_LICENSE("GPL");
927MODULE_AUTHOR("Kiran Kumar Immidi");
928MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
929MODULE_ALIAS("ip_conntrack_proto_sctp");
Linux 6.x block layer and io_uring tree(s)