2 * Connection tracking protocol helper module for SCTP.
4 * Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
5 * Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
7 * SCTP is defined in RFC 2960. References to various sections in this code
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.
15 #include <linux/types.h>
16 #include <linux/timer.h>
17 #include <linux/netfilter.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>
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 #include <net/netfilter/nf_conntrack_timeout.h>
33 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
34 closely. They're more complex. --RR
36 And so for me for SCTP :D -Kiran */
38 static const char *const sctp_conntrack_names[] = {
52 #define MINS * 60 SECS
53 #define HOURS * 60 MINS
54 #define DAYS * 24 HOURS
56 static const unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] = {
57 [SCTP_CONNTRACK_CLOSED] = 10 SECS,
58 [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
59 [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
60 [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
61 [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
62 [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
63 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
64 [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
65 [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
68 #define sNO SCTP_CONNTRACK_NONE
69 #define sCL SCTP_CONNTRACK_CLOSED
70 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
71 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
72 #define sES SCTP_CONNTRACK_ESTABLISHED
73 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
74 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
75 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
76 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
77 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
78 #define sIV SCTP_CONNTRACK_MAX
81 These are the descriptions of the states:
83 NOTE: These state names are tantalizingly similar to the states of an
84 SCTP endpoint. But the interpretation of the states is a little different,
85 considering that these are the states of the connection and not of an end
86 point. Please note the subtleties. -Kiran
88 NONE - Nothing so far.
89 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
90 an INIT_ACK chunk in the reply direction.
91 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
92 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
93 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
94 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
95 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
96 to that of the SHUTDOWN chunk.
97 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
98 the SHUTDOWN chunk. Connection is closed.
99 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
100 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
101 that of the HEARTBEAT chunk. Secondary connection is
106 - I have assumed that the first INIT is in the original direction.
107 This messes things when an INIT comes in the reply direction in CLOSED
109 - Check the error type in the reply dir before transitioning from
110 cookie echoed to closed.
111 - Sec 5.2.4 of RFC 2960
112 - Full Multi Homing support.
115 /* SCTP conntrack state transitions */
116 static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
119 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
120 /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
121 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
122 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
123 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
124 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
125 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
126 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
127 /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
128 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
129 /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
130 /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
134 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
135 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
136 /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
137 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
138 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
139 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
140 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
141 /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
142 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
143 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
144 /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
145 /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
149 static inline struct nf_sctp_net *sctp_pernet(struct net *net)
151 return &net->ct.nf_ct_proto.sctp;
154 #ifdef CONFIG_NF_CONNTRACK_PROCFS
155 /* Print out the private part of the conntrack. */
156 static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
158 seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
162 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
163 for ((offset) = (dataoff) + sizeof(struct sctphdr), (count) = 0; \
164 (offset) < (skb)->len && \
165 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
166 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
168 /* Some validity checks to make sure the chunks are fine */
169 static int do_basic_checks(struct nf_conn *ct,
170 const struct sk_buff *skb,
171 unsigned int dataoff,
174 u_int32_t offset, count;
175 struct sctp_chunkhdr _sch, *sch;
180 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
181 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
183 if (sch->type == SCTP_CID_INIT ||
184 sch->type == SCTP_CID_INIT_ACK ||
185 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
189 * Cookie Ack/Echo chunks not the first OR
190 * Init / Init Ack / Shutdown compl chunks not the only chunks
193 if (((sch->type == SCTP_CID_COOKIE_ACK ||
194 sch->type == SCTP_CID_COOKIE_ECHO ||
196 count != 0) || !sch->length) {
197 pr_debug("Basic checks failed\n");
202 set_bit(sch->type, map);
205 pr_debug("Basic checks passed\n");
209 static int sctp_new_state(enum ip_conntrack_dir dir,
210 enum sctp_conntrack cur_state,
215 pr_debug("Chunk type: %d\n", chunk_type);
217 switch (chunk_type) {
219 pr_debug("SCTP_CID_INIT\n");
222 case SCTP_CID_INIT_ACK:
223 pr_debug("SCTP_CID_INIT_ACK\n");
227 pr_debug("SCTP_CID_ABORT\n");
230 case SCTP_CID_SHUTDOWN:
231 pr_debug("SCTP_CID_SHUTDOWN\n");
234 case SCTP_CID_SHUTDOWN_ACK:
235 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
239 pr_debug("SCTP_CID_ERROR\n");
242 case SCTP_CID_COOKIE_ECHO:
243 pr_debug("SCTP_CID_COOKIE_ECHO\n");
246 case SCTP_CID_COOKIE_ACK:
247 pr_debug("SCTP_CID_COOKIE_ACK\n");
250 case SCTP_CID_SHUTDOWN_COMPLETE:
251 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
254 case SCTP_CID_HEARTBEAT:
255 pr_debug("SCTP_CID_HEARTBEAT");
258 case SCTP_CID_HEARTBEAT_ACK:
259 pr_debug("SCTP_CID_HEARTBEAT_ACK");
263 /* Other chunks like DATA or SACK do not change the state */
264 pr_debug("Unknown chunk type, Will stay in %s\n",
265 sctp_conntrack_names[cur_state]);
269 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
270 dir, sctp_conntrack_names[cur_state], chunk_type,
271 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
273 return sctp_conntracks[dir][i][cur_state];
276 /* Don't need lock here: this conntrack not in circulation yet */
278 sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
279 const struct sctphdr *sh, unsigned int dataoff)
281 enum sctp_conntrack new_state;
282 const struct sctp_chunkhdr *sch;
283 struct sctp_chunkhdr _sch;
286 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
287 new_state = SCTP_CONNTRACK_MAX;
288 for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) {
289 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
290 SCTP_CONNTRACK_NONE, sch->type);
292 /* Invalid: delete conntrack */
293 if (new_state == SCTP_CONNTRACK_NONE ||
294 new_state == SCTP_CONNTRACK_MAX) {
295 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
299 /* Copy the vtag into the state info */
300 if (sch->type == SCTP_CID_INIT) {
301 struct sctp_inithdr _inithdr, *ih;
306 ih = skb_header_pointer(skb, offset + sizeof(_sch),
307 sizeof(_inithdr), &_inithdr);
311 pr_debug("Setting vtag %x for new conn\n",
314 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag;
315 } else if (sch->type == SCTP_CID_HEARTBEAT) {
316 pr_debug("Setting vtag %x for secondary conntrack\n",
318 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
320 /* If it is a shutdown ack OOTB packet, we expect a return
321 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
322 pr_debug("Setting vtag %x for new conn OOTB\n",
324 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
327 ct->proto.sctp.state = new_state;
333 static bool sctp_error(struct sk_buff *skb,
334 unsigned int dataoff,
335 const struct nf_hook_state *state)
337 const struct sctphdr *sh;
340 if (skb->len < dataoff + sizeof(struct sctphdr)) {
341 logmsg = "nf_ct_sctp: short packet ";
344 if (state->hook == NF_INET_PRE_ROUTING &&
345 state->net->ct.sysctl_checksum &&
346 skb->ip_summed == CHECKSUM_NONE) {
347 if (!skb_make_writable(skb, dataoff + sizeof(struct sctphdr))) {
348 logmsg = "nf_ct_sctp: failed to read header ";
351 sh = (const struct sctphdr *)(skb->data + dataoff);
352 if (sh->checksum != sctp_compute_cksum(skb, dataoff)) {
353 logmsg = "nf_ct_sctp: bad CRC ";
356 skb->ip_summed = CHECKSUM_UNNECESSARY;
360 nf_l4proto_log_invalid(skb, state->net, state->pf, IPPROTO_SCTP, "%s", logmsg);
364 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
365 static int sctp_packet(struct nf_conn *ct,
367 unsigned int dataoff,
368 enum ip_conntrack_info ctinfo,
369 const struct nf_hook_state *state)
371 enum sctp_conntrack new_state, old_state;
372 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
373 const struct sctphdr *sh;
374 struct sctphdr _sctph;
375 const struct sctp_chunkhdr *sch;
376 struct sctp_chunkhdr _sch;
377 u_int32_t offset, count;
378 unsigned int *timeouts;
379 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
381 if (sctp_error(skb, dataoff, state))
384 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
388 if (do_basic_checks(ct, skb, dataoff, map) != 0)
391 if (!nf_ct_is_confirmed(ct)) {
392 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
393 if (test_bit(SCTP_CID_ABORT, map) ||
394 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
395 test_bit(SCTP_CID_COOKIE_ACK, map))
398 if (!sctp_new(ct, skb, sh, dataoff))
402 /* Check the verification tag (Sec 8.5) */
403 if (!test_bit(SCTP_CID_INIT, map) &&
404 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
405 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
406 !test_bit(SCTP_CID_ABORT, map) &&
407 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
408 !test_bit(SCTP_CID_HEARTBEAT, map) &&
409 !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
410 sh->vtag != ct->proto.sctp.vtag[dir]) {
411 pr_debug("Verification tag check failed\n");
415 old_state = new_state = SCTP_CONNTRACK_NONE;
416 spin_lock_bh(&ct->lock);
417 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
418 /* Special cases of Verification tag check (Sec 8.5.1) */
419 if (sch->type == SCTP_CID_INIT) {
423 } else if (sch->type == SCTP_CID_ABORT) {
425 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
426 sh->vtag != ct->proto.sctp.vtag[!dir])
428 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
430 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
431 sh->vtag != ct->proto.sctp.vtag[!dir] &&
432 sch->flags & SCTP_CHUNK_FLAG_T)
434 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
436 if (sh->vtag != ct->proto.sctp.vtag[dir])
438 } else if (sch->type == SCTP_CID_HEARTBEAT ||
439 sch->type == SCTP_CID_HEARTBEAT_ACK) {
440 if (ct->proto.sctp.vtag[dir] == 0) {
441 pr_debug("Setting vtag %x for dir %d\n",
443 ct->proto.sctp.vtag[dir] = sh->vtag;
444 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
445 pr_debug("Verification tag check failed\n");
450 old_state = ct->proto.sctp.state;
451 new_state = sctp_new_state(dir, old_state, sch->type);
454 if (new_state == SCTP_CONNTRACK_MAX) {
455 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
457 dir, sch->type, old_state);
461 /* If it is an INIT or an INIT ACK note down the vtag */
462 if (sch->type == SCTP_CID_INIT ||
463 sch->type == SCTP_CID_INIT_ACK) {
464 struct sctp_inithdr _inithdr, *ih;
466 ih = skb_header_pointer(skb, offset + sizeof(_sch),
467 sizeof(_inithdr), &_inithdr);
470 pr_debug("Setting vtag %x for dir %d\n",
472 ct->proto.sctp.vtag[!dir] = ih->init_tag;
475 ct->proto.sctp.state = new_state;
476 if (old_state != new_state)
477 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
479 spin_unlock_bh(&ct->lock);
481 timeouts = nf_ct_timeout_lookup(ct);
483 timeouts = sctp_pernet(nf_ct_net(ct))->timeouts;
485 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
487 if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
488 dir == IP_CT_DIR_REPLY &&
489 new_state == SCTP_CONNTRACK_ESTABLISHED) {
490 pr_debug("Setting assured bit\n");
491 set_bit(IPS_ASSURED_BIT, &ct->status);
492 nf_conntrack_event_cache(IPCT_ASSURED, ct);
498 spin_unlock_bh(&ct->lock);
503 static bool sctp_can_early_drop(const struct nf_conn *ct)
505 switch (ct->proto.sctp.state) {
506 case SCTP_CONNTRACK_SHUTDOWN_SENT:
507 case SCTP_CONNTRACK_SHUTDOWN_RECD:
508 case SCTP_CONNTRACK_SHUTDOWN_ACK_SENT:
517 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
519 #include <linux/netfilter/nfnetlink.h>
520 #include <linux/netfilter/nfnetlink_conntrack.h>
522 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
525 struct nlattr *nest_parms;
527 spin_lock_bh(&ct->lock);
528 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
530 goto nla_put_failure;
532 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
533 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
534 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
535 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
536 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
537 goto nla_put_failure;
539 spin_unlock_bh(&ct->lock);
541 nla_nest_end(skb, nest_parms);
546 spin_unlock_bh(&ct->lock);
550 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
551 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
552 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
553 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
556 #define SCTP_NLATTR_SIZE ( \
557 NLA_ALIGN(NLA_HDRLEN + 1) + \
558 NLA_ALIGN(NLA_HDRLEN + 4) + \
559 NLA_ALIGN(NLA_HDRLEN + 4))
561 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
563 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
564 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
567 /* updates may not contain the internal protocol info, skip parsing */
571 err = nla_parse_nested(tb, CTA_PROTOINFO_SCTP_MAX, attr,
572 sctp_nla_policy, NULL);
576 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
577 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
578 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
581 spin_lock_bh(&ct->lock);
582 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
583 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
584 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
585 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
586 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
587 spin_unlock_bh(&ct->lock);
593 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
595 #include <linux/netfilter/nfnetlink.h>
596 #include <linux/netfilter/nfnetlink_cttimeout.h>
598 static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
599 struct net *net, void *data)
601 unsigned int *timeouts = data;
602 struct nf_sctp_net *sn = sctp_pernet(net);
605 /* set default SCTP timeouts. */
606 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
607 timeouts[i] = sn->timeouts[i];
609 /* there's a 1:1 mapping between attributes and protocol states. */
610 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
612 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
616 timeouts[CTA_TIMEOUT_SCTP_UNSPEC] = timeouts[CTA_TIMEOUT_SCTP_CLOSED];
621 sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
623 const unsigned int *timeouts = data;
626 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
627 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
628 goto nla_put_failure;
636 static const struct nla_policy
637 sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
638 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
639 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
640 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
641 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
642 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
643 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
644 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
645 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
646 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
648 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
652 static struct ctl_table sctp_sysctl_table[] = {
654 .procname = "nf_conntrack_sctp_timeout_closed",
655 .maxlen = sizeof(unsigned int),
657 .proc_handler = proc_dointvec_jiffies,
660 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
661 .maxlen = sizeof(unsigned int),
663 .proc_handler = proc_dointvec_jiffies,
666 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
667 .maxlen = sizeof(unsigned int),
669 .proc_handler = proc_dointvec_jiffies,
672 .procname = "nf_conntrack_sctp_timeout_established",
673 .maxlen = sizeof(unsigned int),
675 .proc_handler = proc_dointvec_jiffies,
678 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
679 .maxlen = sizeof(unsigned int),
681 .proc_handler = proc_dointvec_jiffies,
684 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
685 .maxlen = sizeof(unsigned int),
687 .proc_handler = proc_dointvec_jiffies,
690 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
691 .maxlen = sizeof(unsigned int),
693 .proc_handler = proc_dointvec_jiffies,
696 .procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
697 .maxlen = sizeof(unsigned int),
699 .proc_handler = proc_dointvec_jiffies,
702 .procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
703 .maxlen = sizeof(unsigned int),
705 .proc_handler = proc_dointvec_jiffies,
711 static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn,
712 struct nf_sctp_net *sn)
718 pn->ctl_table = kmemdup(sctp_sysctl_table,
719 sizeof(sctp_sysctl_table),
724 pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
725 pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
726 pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
727 pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
728 pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
729 pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
730 pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
731 pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT];
732 pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED];
737 static int sctp_init_net(struct net *net)
739 struct nf_sctp_net *sn = sctp_pernet(net);
740 struct nf_proto_net *pn = &sn->pn;
745 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
746 sn->timeouts[i] = sctp_timeouts[i];
748 /* timeouts[0] is unused, init it so ->timeouts[0] contains
749 * 'new' timeout, like udp or icmp.
751 sn->timeouts[0] = sctp_timeouts[SCTP_CONNTRACK_CLOSED];
754 return sctp_kmemdup_sysctl_table(pn, sn);
757 static struct nf_proto_net *sctp_get_net_proto(struct net *net)
759 return &net->ct.nf_ct_proto.sctp.pn;
762 const struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp = {
763 .l4proto = IPPROTO_SCTP,
764 #ifdef CONFIG_NF_CONNTRACK_PROCFS
765 .print_conntrack = sctp_print_conntrack,
767 .packet = sctp_packet,
768 .can_early_drop = sctp_can_early_drop,
770 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
771 .nlattr_size = SCTP_NLATTR_SIZE,
772 .to_nlattr = sctp_to_nlattr,
773 .from_nlattr = nlattr_to_sctp,
774 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
775 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
776 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
777 .nla_policy = nf_ct_port_nla_policy,
779 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
781 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
782 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
783 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
784 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
785 .nla_policy = sctp_timeout_nla_policy,
787 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
788 .init_net = sctp_init_net,
789 .get_net_proto = sctp_get_net_proto,