1 // SPDX-License-Identifier: GPL-2.0-only
3 * Connection tracking protocol helper module for SCTP.
5 * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
6 * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
8 * SCTP is defined in RFC 2960. References to various sections in this code
12 #include <linux/types.h>
13 #include <linux/timer.h>
14 #include <linux/netfilter.h>
17 #include <linux/sctp.h>
18 #include <linux/string.h>
19 #include <linux/seq_file.h>
20 #include <linux/spinlock.h>
21 #include <linux/interrupt.h>
22 #include <net/sctp/checksum.h>
24 #include <net/netfilter/nf_log.h>
25 #include <net/netfilter/nf_conntrack.h>
26 #include <net/netfilter/nf_conntrack_l4proto.h>
27 #include <net/netfilter/nf_conntrack_ecache.h>
28 #include <net/netfilter/nf_conntrack_timeout.h>
30 static const char *const sctp_conntrack_names[] = {
31 [SCTP_CONNTRACK_NONE] = "NONE",
32 [SCTP_CONNTRACK_CLOSED] = "CLOSED",
33 [SCTP_CONNTRACK_COOKIE_WAIT] = "COOKIE_WAIT",
34 [SCTP_CONNTRACK_COOKIE_ECHOED] = "COOKIE_ECHOED",
35 [SCTP_CONNTRACK_ESTABLISHED] = "ESTABLISHED",
36 [SCTP_CONNTRACK_SHUTDOWN_SENT] = "SHUTDOWN_SENT",
37 [SCTP_CONNTRACK_SHUTDOWN_RECD] = "SHUTDOWN_RECD",
38 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = "SHUTDOWN_ACK_SENT",
39 [SCTP_CONNTRACK_HEARTBEAT_SENT] = "HEARTBEAT_SENT",
43 #define MINS * 60 SECS
44 #define HOURS * 60 MINS
45 #define DAYS * 24 HOURS
47 static const unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] = {
48 [SCTP_CONNTRACK_CLOSED] = 10 SECS,
49 [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
50 [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
51 [SCTP_CONNTRACK_ESTABLISHED] = 210 SECS,
52 [SCTP_CONNTRACK_SHUTDOWN_SENT] = 3 SECS,
53 [SCTP_CONNTRACK_SHUTDOWN_RECD] = 3 SECS,
54 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
55 [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
58 #define SCTP_FLAG_HEARTBEAT_VTAG_FAILED 1
60 #define sNO SCTP_CONNTRACK_NONE
61 #define sCL SCTP_CONNTRACK_CLOSED
62 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
63 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
64 #define sES SCTP_CONNTRACK_ESTABLISHED
65 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
66 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
67 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
68 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
69 #define sIV SCTP_CONNTRACK_MAX
72 These are the descriptions of the states:
74 NOTE: These state names are tantalizingly similar to the states of an
75 SCTP endpoint. But the interpretation of the states is a little different,
76 considering that these are the states of the connection and not of an end
77 point. Please note the subtleties. -Kiran
79 NONE - Nothing so far.
80 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
81 an INIT_ACK chunk in the reply direction.
82 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
83 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
84 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
85 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply direction.
86 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
87 to that of the SHUTDOWN chunk.
88 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
89 the SHUTDOWN chunk. Connection is closed.
90 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
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
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 - Full Multi Homing support.
103 /* SCTP conntrack state transitions */
104 static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
107 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS */
108 /* init */ {sCL, sCL, sCW, sCE, sES, sCL, sCL, sSA, sCW},
109 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL},
110 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
111 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL},
112 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA},
113 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL},/* Can't have Stale cookie*/
114 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL},/* 5.2.4 - Big TODO */
115 /* cookie_ack */ {sCL, sCL, sCW, sES, sES, sSS, sSR, sSA, sCL},/* Can't come in orig dir */
116 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL},
117 /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS},
118 /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS},
122 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS */
123 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV},/* INIT in sCL Big TODO */
124 /* init_ack */ {sIV, sCW, sCW, sCE, sES, sSS, sSR, sSA, sIV},
125 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV},
126 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV},
127 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV},
128 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV},
129 /* cookie_echo */ {sIV, sCL, sCE, sCE, sES, sSS, sSR, sSA, sIV},/* Can't come in reply dir */
130 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV},
131 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV},
132 /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS},
133 /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sES},
137 #ifdef CONFIG_NF_CONNTRACK_PROCFS
138 /* Print out the private part of the conntrack. */
139 static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
141 seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
145 /* do_basic_checks ensures sch->length > 0, do not use before */
146 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
147 for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \
148 (offset) < (skb)->len && \
149 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
150 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
152 /* Some validity checks to make sure the chunks are fine */
153 static int do_basic_checks(struct nf_conn *ct,
154 const struct sk_buff *skb,
155 unsigned int dataoff,
157 const struct nf_hook_state *state)
159 u_int32_t offset, count;
160 struct sctp_chunkhdr _sch, *sch;
165 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
166 if (sch->type == SCTP_CID_INIT ||
167 sch->type == SCTP_CID_INIT_ACK ||
168 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
172 * Cookie Ack/Echo chunks not the first OR
173 * Init / Init Ack / Shutdown compl chunks not the only chunks
176 if (((sch->type == SCTP_CID_COOKIE_ACK ||
177 sch->type == SCTP_CID_COOKIE_ECHO ||
179 count != 0) || !sch->length) {
180 nf_ct_l4proto_log_invalid(skb, ct, state,
181 "%s failed. chunk num %d, type %d, len %d flag %d\n",
182 __func__, count, sch->type, sch->length, flag);
187 set_bit(sch->type, map);
193 static int sctp_new_state(enum ip_conntrack_dir dir,
194 enum sctp_conntrack cur_state,
199 switch (chunk_type) {
203 case SCTP_CID_INIT_ACK:
209 case SCTP_CID_SHUTDOWN:
212 case SCTP_CID_SHUTDOWN_ACK:
218 case SCTP_CID_COOKIE_ECHO:
221 case SCTP_CID_COOKIE_ACK:
224 case SCTP_CID_SHUTDOWN_COMPLETE:
227 case SCTP_CID_HEARTBEAT:
230 case SCTP_CID_HEARTBEAT_ACK:
234 /* Other chunks like DATA or SACK do not change the state */
235 pr_debug("Unknown chunk type %d, Will stay in %s\n",
236 chunk_type, sctp_conntrack_names[cur_state]);
240 return sctp_conntracks[dir][i][cur_state];
243 /* Don't need lock here: this conntrack not in circulation yet */
245 sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
246 const struct sctphdr *sh, unsigned int dataoff)
248 enum sctp_conntrack new_state;
249 const struct sctp_chunkhdr *sch;
250 struct sctp_chunkhdr _sch;
253 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
254 new_state = SCTP_CONNTRACK_MAX;
255 for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) {
256 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
257 SCTP_CONNTRACK_NONE, sch->type);
259 /* Invalid: delete conntrack */
260 if (new_state == SCTP_CONNTRACK_NONE ||
261 new_state == SCTP_CONNTRACK_MAX) {
262 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
266 /* Copy the vtag into the state info */
267 if (sch->type == SCTP_CID_INIT) {
268 struct sctp_inithdr _inithdr, *ih;
273 ih = skb_header_pointer(skb, offset + sizeof(_sch),
274 sizeof(_inithdr), &_inithdr);
278 pr_debug("Setting vtag %x for new conn\n",
281 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag;
282 } else if (sch->type == SCTP_CID_HEARTBEAT) {
283 pr_debug("Setting vtag %x for secondary conntrack\n",
285 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
287 /* If it is a shutdown ack OOTB packet, we expect a return
288 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
289 pr_debug("Setting vtag %x for new conn OOTB\n",
291 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
294 ct->proto.sctp.state = SCTP_CONNTRACK_NONE;
300 static bool sctp_error(struct sk_buff *skb,
301 unsigned int dataoff,
302 const struct nf_hook_state *state)
304 const struct sctphdr *sh;
307 if (skb->len < dataoff + sizeof(struct sctphdr)) {
308 logmsg = "nf_ct_sctp: short packet ";
311 if (state->hook == NF_INET_PRE_ROUTING &&
312 state->net->ct.sysctl_checksum &&
313 skb->ip_summed == CHECKSUM_NONE) {
314 if (skb_ensure_writable(skb, dataoff + sizeof(*sh))) {
315 logmsg = "nf_ct_sctp: failed to read header ";
318 sh = (const struct sctphdr *)(skb->data + dataoff);
319 if (sh->checksum != sctp_compute_cksum(skb, dataoff)) {
320 logmsg = "nf_ct_sctp: bad CRC ";
323 skb->ip_summed = CHECKSUM_UNNECESSARY;
327 nf_l4proto_log_invalid(skb, state, IPPROTO_SCTP, "%s", logmsg);
331 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
332 int nf_conntrack_sctp_packet(struct nf_conn *ct,
334 unsigned int dataoff,
335 enum ip_conntrack_info ctinfo,
336 const struct nf_hook_state *state)
338 enum sctp_conntrack new_state, old_state;
339 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
340 const struct sctphdr *sh;
341 struct sctphdr _sctph;
342 const struct sctp_chunkhdr *sch;
343 struct sctp_chunkhdr _sch;
344 u_int32_t offset, count;
345 unsigned int *timeouts;
346 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
349 if (sctp_error(skb, dataoff, state))
352 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
356 if (do_basic_checks(ct, skb, dataoff, map, state) != 0)
359 if (!nf_ct_is_confirmed(ct)) {
360 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
361 if (test_bit(SCTP_CID_ABORT, map) ||
362 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
363 test_bit(SCTP_CID_COOKIE_ACK, map))
366 if (!sctp_new(ct, skb, sh, dataoff))
370 /* Check the verification tag (Sec 8.5) */
371 if (!test_bit(SCTP_CID_INIT, map) &&
372 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
373 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
374 !test_bit(SCTP_CID_ABORT, map) &&
375 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
376 !test_bit(SCTP_CID_HEARTBEAT, map) &&
377 !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
378 sh->vtag != ct->proto.sctp.vtag[dir]) {
379 nf_ct_l4proto_log_invalid(skb, ct, state,
380 "verification tag check failed %x vs %x for dir %d",
381 sh->vtag, ct->proto.sctp.vtag[dir], dir);
385 old_state = new_state = SCTP_CONNTRACK_NONE;
386 spin_lock_bh(&ct->lock);
387 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
388 /* Special cases of Verification tag check (Sec 8.5.1) */
389 if (sch->type == SCTP_CID_INIT) {
390 /* (A) vtag MUST be zero */
393 } else if (sch->type == SCTP_CID_ABORT) {
394 /* (B) vtag MUST match own vtag if T flag is unset OR
395 * MUST match peer's vtag if T flag is set
397 if ((!(sch->flags & SCTP_CHUNK_FLAG_T) &&
398 sh->vtag != ct->proto.sctp.vtag[dir]) ||
399 ((sch->flags & SCTP_CHUNK_FLAG_T) &&
400 sh->vtag != ct->proto.sctp.vtag[!dir]))
402 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
403 /* (C) vtag MUST match own vtag if T flag is unset OR
404 * MUST match peer's vtag if T flag is set
406 if ((!(sch->flags & SCTP_CHUNK_FLAG_T) &&
407 sh->vtag != ct->proto.sctp.vtag[dir]) ||
408 ((sch->flags & SCTP_CHUNK_FLAG_T) &&
409 sh->vtag != ct->proto.sctp.vtag[!dir]))
411 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
412 /* (D) vtag must be same as init_vtag as found in INIT_ACK */
413 if (sh->vtag != ct->proto.sctp.vtag[dir])
415 } else if (sch->type == SCTP_CID_COOKIE_ACK) {
416 ct->proto.sctp.init[dir] = 0;
417 ct->proto.sctp.init[!dir] = 0;
418 } else if (sch->type == SCTP_CID_HEARTBEAT) {
419 if (ct->proto.sctp.vtag[dir] == 0) {
420 pr_debug("Setting %d vtag %x for dir %d\n", sch->type, sh->vtag, dir);
421 ct->proto.sctp.vtag[dir] = sh->vtag;
422 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
423 if (test_bit(SCTP_CID_DATA, map) || ignore)
426 ct->proto.sctp.flags |= SCTP_FLAG_HEARTBEAT_VTAG_FAILED;
427 ct->proto.sctp.last_dir = dir;
430 } else if (ct->proto.sctp.flags & SCTP_FLAG_HEARTBEAT_VTAG_FAILED) {
431 ct->proto.sctp.flags &= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED;
433 } else if (sch->type == SCTP_CID_HEARTBEAT_ACK) {
434 if (ct->proto.sctp.vtag[dir] == 0) {
435 pr_debug("Setting vtag %x for dir %d\n",
437 ct->proto.sctp.vtag[dir] = sh->vtag;
438 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
439 if (test_bit(SCTP_CID_DATA, map) || ignore)
442 if ((ct->proto.sctp.flags & SCTP_FLAG_HEARTBEAT_VTAG_FAILED) == 0 ||
443 ct->proto.sctp.last_dir == dir)
446 ct->proto.sctp.flags &= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED;
447 ct->proto.sctp.vtag[dir] = sh->vtag;
448 ct->proto.sctp.vtag[!dir] = 0;
449 } else if (ct->proto.sctp.flags & SCTP_FLAG_HEARTBEAT_VTAG_FAILED) {
450 ct->proto.sctp.flags &= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED;
454 old_state = ct->proto.sctp.state;
455 new_state = sctp_new_state(dir, old_state, sch->type);
458 if (new_state == SCTP_CONNTRACK_MAX) {
459 nf_ct_l4proto_log_invalid(skb, ct, state,
460 "Invalid, old_state %d, dir %d, type %d",
461 old_state, dir, sch->type);
466 /* If it is an INIT or an INIT ACK note down the vtag */
467 if (sch->type == SCTP_CID_INIT) {
468 struct sctp_inithdr _ih, *ih;
470 ih = skb_header_pointer(skb, offset + sizeof(_sch), sizeof(*ih), &_ih);
474 if (ct->proto.sctp.init[dir] && ct->proto.sctp.init[!dir])
475 ct->proto.sctp.init[!dir] = 0;
476 ct->proto.sctp.init[dir] = 1;
478 pr_debug("Setting vtag %x for dir %d\n", ih->init_tag, !dir);
479 ct->proto.sctp.vtag[!dir] = ih->init_tag;
481 /* don't renew timeout on init retransmit so
482 * port reuse by client or NAT middlebox cannot
483 * keep entry alive indefinitely (incl. nat info).
485 if (new_state == SCTP_CONNTRACK_CLOSED &&
486 old_state == SCTP_CONNTRACK_CLOSED &&
487 nf_ct_is_confirmed(ct))
489 } else if (sch->type == SCTP_CID_INIT_ACK) {
490 struct sctp_inithdr _ih, *ih;
493 ih = skb_header_pointer(skb, offset + sizeof(_sch), sizeof(*ih), &_ih);
497 vtag = ct->proto.sctp.vtag[!dir];
498 if (!ct->proto.sctp.init[!dir] && vtag && vtag != ih->init_tag)
501 if (ct->proto.sctp.init[dir] && ct->proto.sctp.init[!dir] &&
502 vtag != ih->init_tag)
505 pr_debug("Setting vtag %x for dir %d\n", ih->init_tag, !dir);
506 ct->proto.sctp.vtag[!dir] = ih->init_tag;
509 ct->proto.sctp.state = new_state;
510 if (old_state != new_state) {
511 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
512 if (new_state == SCTP_CONNTRACK_ESTABLISHED &&
513 !test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
514 nf_conntrack_event_cache(IPCT_ASSURED, ct);
517 spin_unlock_bh(&ct->lock);
519 /* allow but do not refresh timeout */
523 timeouts = nf_ct_timeout_lookup(ct);
525 timeouts = nf_sctp_pernet(nf_ct_net(ct))->timeouts;
527 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
532 spin_unlock_bh(&ct->lock);
537 static bool sctp_can_early_drop(const struct nf_conn *ct)
539 switch (ct->proto.sctp.state) {
540 case SCTP_CONNTRACK_SHUTDOWN_SENT:
541 case SCTP_CONNTRACK_SHUTDOWN_RECD:
542 case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT:
551 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
553 #include <linux/netfilter/nfnetlink.h>
554 #include <linux/netfilter/nfnetlink_conntrack.h>
556 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
557 struct nf_conn *ct, bool destroy)
559 struct nlattr *nest_parms;
561 spin_lock_bh(&ct->lock);
562 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP);
564 goto nla_put_failure;
566 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state))
567 goto nla_put_failure;
572 if (nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
573 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
574 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
575 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
576 goto nla_put_failure;
579 spin_unlock_bh(&ct->lock);
580 nla_nest_end(skb, nest_parms);
585 spin_unlock_bh(&ct->lock);
589 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
590 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
591 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
592 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
595 #define SCTP_NLATTR_SIZE ( \
596 NLA_ALIGN(NLA_HDRLEN + 1) + \
597 NLA_ALIGN(NLA_HDRLEN + 4) + \
598 NLA_ALIGN(NLA_HDRLEN + 4))
600 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
602 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
603 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
606 /* updates may not contain the internal protocol info, skip parsing */
610 err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_SCTP_MAX, attr,
611 sctp_nla_policy, NULL);
615 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
616 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
617 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
620 spin_lock_bh(&ct->lock);
621 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
622 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
623 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
624 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
625 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
626 spin_unlock_bh(&ct->lock);
632 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
634 #include <linux/netfilter/nfnetlink.h>
635 #include <linux/netfilter/nfnetlink_cttimeout.h>
637 static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
638 struct net *net, void *data)
640 unsigned int *timeouts = data;
641 struct nf_sctp_net *sn = nf_sctp_pernet(net);
645 timeouts = sn->timeouts;
647 /* set default SCTP timeouts. */
648 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
649 timeouts[i] = sn->timeouts[i];
651 /* there's a 1:1 mapping between attributes and protocol states. */
652 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
654 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
658 timeouts[CTA_TIMEOUT_SCTP_UNSPEC] = timeouts[CTA_TIMEOUT_SCTP_CLOSED];
663 sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
665 const unsigned int *timeouts = data;
668 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
669 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
670 goto nla_put_failure;
678 static const struct nla_policy
679 sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
680 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
681 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
682 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
683 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
684 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
685 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
686 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
687 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
688 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
690 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
692 void nf_conntrack_sctp_init_net(struct net *net)
694 struct nf_sctp_net *sn = nf_sctp_pernet(net);
697 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
698 sn->timeouts[i] = sctp_timeouts[i];
700 /* timeouts[0] is unused, init it so ->timeouts[0] contains
701 * 'new' timeout, like udp or icmp.
703 sn->timeouts[0] = sctp_timeouts[SCTP_CONNTRACK_CLOSED];
706 const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp = {
707 .l4proto = IPPROTO_SCTP,
708 #ifdef CONFIG_NF_CONNTRACK_PROCFS
709 .print_conntrack = sctp_print_conntrack,
711 .can_early_drop = sctp_can_early_drop,
712 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
713 .nlattr_size = SCTP_NLATTR_SIZE,
714 .to_nlattr = sctp_to_nlattr,
715 .from_nlattr = nlattr_to_sctp,
716 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
717 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
718 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
719 .nla_policy = nf_ct_port_nla_policy,
721 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
723 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
724 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
725 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
726 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
727 .nla_policy = sctp_timeout_nla_policy,
729 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */