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>
18 #include <linux/module.h>
21 #include <linux/sctp.h>
22 #include <linux/string.h>
23 #include <linux/seq_file.h>
24 #include <linux/spinlock.h>
25 #include <linux/interrupt.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_l4proto.h>
29 #include <net/netfilter/nf_conntrack_ecache.h>
31 /* FIXME: Examine ipfilter's timeouts and conntrack transitions more
32 closely. They're more complex. --RR
34 And so for me for SCTP :D -Kiran */
36 static const char *const sctp_conntrack_names[] = {
50 #define MINS * 60 SECS
51 #define HOURS * 60 MINS
52 #define DAYS * 24 HOURS
54 static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
55 [SCTP_CONNTRACK_CLOSED] = 10 SECS,
56 [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
57 [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
58 [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
59 [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
60 [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
61 [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
62 [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
63 [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
66 #define sNO SCTP_CONNTRACK_NONE
67 #define sCL SCTP_CONNTRACK_CLOSED
68 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
69 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
70 #define sES SCTP_CONNTRACK_ESTABLISHED
71 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
72 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
73 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
74 #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
75 #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
76 #define sIV SCTP_CONNTRACK_MAX
79 These are the descriptions of the states:
81 NOTE: These state names are tantalizingly similar to the states of an
82 SCTP endpoint. But the interpretation of the states is a little different,
83 considering that these are the states of the connection and not of an end
84 point. Please note the subtleties. -Kiran
86 NONE - Nothing so far.
87 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
88 an INIT_ACK chunk in the reply direction.
89 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
90 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
91 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
92 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
93 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
94 to that of the SHUTDOWN chunk.
95 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
96 the SHUTDOWN chunk. Connection is closed.
97 HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
98 HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
99 that of the HEARTBEAT chunk. Secondary connection is
104 - I have assumed that the first INIT is in the original direction.
105 This messes things when an INIT comes in the reply direction in CLOSED
107 - Check the error type in the reply dir before transitioning from
108 cookie echoed to closed.
109 - Sec 5.2.4 of RFC 2960
110 - Full Multi Homing support.
113 /* SCTP conntrack state transitions */
114 static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
117 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
118 /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
119 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
120 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
121 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
122 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
123 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
124 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
125 /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
126 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
127 /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
128 /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
132 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
133 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
134 /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
135 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
136 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
137 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
138 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
139 /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
140 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
141 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
142 /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
143 /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
147 static int sctp_net_id __read_mostly;
149 struct nf_proto_net pn;
150 unsigned int timeouts[SCTP_CONNTRACK_MAX];
153 static inline struct sctp_net *sctp_pernet(struct net *net)
155 return net_generic(net, sctp_net_id);
158 static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
159 struct net *net, struct nf_conntrack_tuple *tuple)
161 const struct sctphdr *hp;
164 /* Actually only need first 4 bytes to get ports. */
165 hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
169 tuple->src.u.sctp.port = hp->source;
170 tuple->dst.u.sctp.port = hp->dest;
174 static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
175 const struct nf_conntrack_tuple *orig)
177 tuple->src.u.sctp.port = orig->dst.u.sctp.port;
178 tuple->dst.u.sctp.port = orig->src.u.sctp.port;
182 /* Print out the per-protocol part of the tuple. */
183 static void sctp_print_tuple(struct seq_file *s,
184 const struct nf_conntrack_tuple *tuple)
186 seq_printf(s, "sport=%hu dport=%hu ",
187 ntohs(tuple->src.u.sctp.port),
188 ntohs(tuple->dst.u.sctp.port));
191 /* Print out the private part of the conntrack. */
192 static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
194 seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
197 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
198 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
199 (offset) < (skb)->len && \
200 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
201 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
203 /* Some validity checks to make sure the chunks are fine */
204 static int do_basic_checks(struct nf_conn *ct,
205 const struct sk_buff *skb,
206 unsigned int dataoff,
209 u_int32_t offset, count;
210 sctp_chunkhdr_t _sch, *sch;
215 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
216 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
218 if (sch->type == SCTP_CID_INIT ||
219 sch->type == SCTP_CID_INIT_ACK ||
220 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
224 * Cookie Ack/Echo chunks not the first OR
225 * Init / Init Ack / Shutdown compl chunks not the only chunks
228 if (((sch->type == SCTP_CID_COOKIE_ACK ||
229 sch->type == SCTP_CID_COOKIE_ECHO ||
231 count != 0) || !sch->length) {
232 pr_debug("Basic checks failed\n");
237 set_bit(sch->type, map);
240 pr_debug("Basic checks passed\n");
244 static int sctp_new_state(enum ip_conntrack_dir dir,
245 enum sctp_conntrack cur_state,
250 pr_debug("Chunk type: %d\n", chunk_type);
252 switch (chunk_type) {
254 pr_debug("SCTP_CID_INIT\n");
257 case SCTP_CID_INIT_ACK:
258 pr_debug("SCTP_CID_INIT_ACK\n");
262 pr_debug("SCTP_CID_ABORT\n");
265 case SCTP_CID_SHUTDOWN:
266 pr_debug("SCTP_CID_SHUTDOWN\n");
269 case SCTP_CID_SHUTDOWN_ACK:
270 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
274 pr_debug("SCTP_CID_ERROR\n");
277 case SCTP_CID_COOKIE_ECHO:
278 pr_debug("SCTP_CID_COOKIE_ECHO\n");
281 case SCTP_CID_COOKIE_ACK:
282 pr_debug("SCTP_CID_COOKIE_ACK\n");
285 case SCTP_CID_SHUTDOWN_COMPLETE:
286 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
289 case SCTP_CID_HEARTBEAT:
290 pr_debug("SCTP_CID_HEARTBEAT");
293 case SCTP_CID_HEARTBEAT_ACK:
294 pr_debug("SCTP_CID_HEARTBEAT_ACK");
298 /* Other chunks like DATA or SACK do not change the state */
299 pr_debug("Unknown chunk type, Will stay in %s\n",
300 sctp_conntrack_names[cur_state]);
304 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
305 dir, sctp_conntrack_names[cur_state], chunk_type,
306 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
308 return sctp_conntracks[dir][i][cur_state];
311 static unsigned int *sctp_get_timeouts(struct net *net)
313 return sctp_pernet(net)->timeouts;
316 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
317 static int sctp_packet(struct nf_conn *ct,
318 const struct sk_buff *skb,
319 unsigned int dataoff,
320 enum ip_conntrack_info ctinfo,
322 unsigned int hooknum,
323 unsigned int *timeouts)
325 enum sctp_conntrack new_state, old_state;
326 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
327 const struct sctphdr *sh;
328 struct sctphdr _sctph;
329 const struct sctp_chunkhdr *sch;
330 struct sctp_chunkhdr _sch;
331 u_int32_t offset, count;
332 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
334 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
338 if (do_basic_checks(ct, skb, dataoff, map) != 0)
341 /* Check the verification tag (Sec 8.5) */
342 if (!test_bit(SCTP_CID_INIT, map) &&
343 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
344 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
345 !test_bit(SCTP_CID_ABORT, map) &&
346 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
347 !test_bit(SCTP_CID_HEARTBEAT, map) &&
348 !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
349 sh->vtag != ct->proto.sctp.vtag[dir]) {
350 pr_debug("Verification tag check failed\n");
354 old_state = new_state = SCTP_CONNTRACK_NONE;
355 spin_lock_bh(&ct->lock);
356 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
357 /* Special cases of Verification tag check (Sec 8.5.1) */
358 if (sch->type == SCTP_CID_INIT) {
362 } else if (sch->type == SCTP_CID_ABORT) {
364 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
365 sh->vtag != ct->proto.sctp.vtag[!dir])
367 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
369 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
370 sh->vtag != ct->proto.sctp.vtag[!dir] &&
371 sch->flags & SCTP_CHUNK_FLAG_T)
373 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
375 if (sh->vtag != ct->proto.sctp.vtag[dir])
377 } else if (sch->type == SCTP_CID_HEARTBEAT ||
378 sch->type == SCTP_CID_HEARTBEAT_ACK) {
379 if (ct->proto.sctp.vtag[dir] == 0) {
380 pr_debug("Setting vtag %x for dir %d\n",
382 ct->proto.sctp.vtag[dir] = sh->vtag;
383 } else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
384 pr_debug("Verification tag check failed\n");
389 old_state = ct->proto.sctp.state;
390 new_state = sctp_new_state(dir, old_state, sch->type);
393 if (new_state == SCTP_CONNTRACK_MAX) {
394 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
396 dir, sch->type, old_state);
400 /* If it is an INIT or an INIT ACK note down the vtag */
401 if (sch->type == SCTP_CID_INIT ||
402 sch->type == SCTP_CID_INIT_ACK) {
403 sctp_inithdr_t _inithdr, *ih;
405 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
406 sizeof(_inithdr), &_inithdr);
409 pr_debug("Setting vtag %x for dir %d\n",
411 ct->proto.sctp.vtag[!dir] = ih->init_tag;
414 ct->proto.sctp.state = new_state;
415 if (old_state != new_state)
416 nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
418 spin_unlock_bh(&ct->lock);
420 nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
422 if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
423 dir == IP_CT_DIR_REPLY &&
424 new_state == SCTP_CONNTRACK_ESTABLISHED) {
425 pr_debug("Setting assured bit\n");
426 set_bit(IPS_ASSURED_BIT, &ct->status);
427 nf_conntrack_event_cache(IPCT_ASSURED, ct);
433 spin_unlock_bh(&ct->lock);
438 /* Called when a new connection for this protocol found. */
439 static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
440 unsigned int dataoff, unsigned int *timeouts)
442 enum sctp_conntrack new_state;
443 const struct sctphdr *sh;
444 struct sctphdr _sctph;
445 const struct sctp_chunkhdr *sch;
446 struct sctp_chunkhdr _sch;
447 u_int32_t offset, count;
448 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
450 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
454 if (do_basic_checks(ct, skb, dataoff, map) != 0)
457 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
458 if (test_bit(SCTP_CID_ABORT, map) ||
459 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
460 test_bit(SCTP_CID_COOKIE_ACK, map))
463 memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
464 new_state = SCTP_CONNTRACK_MAX;
465 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
466 /* Don't need lock here: this conntrack not in circulation yet */
467 new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
468 SCTP_CONNTRACK_NONE, sch->type);
470 /* Invalid: delete conntrack */
471 if (new_state == SCTP_CONNTRACK_NONE ||
472 new_state == SCTP_CONNTRACK_MAX) {
473 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
477 /* Copy the vtag into the state info */
478 if (sch->type == SCTP_CID_INIT) {
480 sctp_inithdr_t _inithdr, *ih;
482 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
483 sizeof(_inithdr), &_inithdr);
487 pr_debug("Setting vtag %x for new conn\n",
490 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
496 } else if (sch->type == SCTP_CID_HEARTBEAT) {
497 pr_debug("Setting vtag %x for secondary conntrack\n",
499 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
501 /* If it is a shutdown ack OOTB packet, we expect a return
502 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
504 pr_debug("Setting vtag %x for new conn OOTB\n",
506 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
509 ct->proto.sctp.state = new_state;
515 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
517 #include <linux/netfilter/nfnetlink.h>
518 #include <linux/netfilter/nfnetlink_conntrack.h>
520 static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
523 struct nlattr *nest_parms;
525 spin_lock_bh(&ct->lock);
526 nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED);
528 goto nla_put_failure;
530 if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
531 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
532 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
533 nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
534 ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
535 goto nla_put_failure;
537 spin_unlock_bh(&ct->lock);
539 nla_nest_end(skb, nest_parms);
544 spin_unlock_bh(&ct->lock);
548 static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
549 [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
550 [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
551 [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
554 static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
556 struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
557 struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
560 /* updates may not contain the internal protocol info, skip parsing */
564 err = nla_parse_nested(tb,
565 CTA_PROTOINFO_SCTP_MAX,
571 if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
572 !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
573 !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
576 spin_lock_bh(&ct->lock);
577 ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
578 ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
579 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
580 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
581 nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
582 spin_unlock_bh(&ct->lock);
587 static int sctp_nlattr_size(void)
589 return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
590 + nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
594 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
596 #include <linux/netfilter/nfnetlink.h>
597 #include <linux/netfilter/nfnetlink_cttimeout.h>
599 static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
600 struct net *net, void *data)
602 unsigned int *timeouts = data;
603 struct sctp_net *sn = sctp_pernet(net);
606 /* set default SCTP timeouts. */
607 for (i=0; i<SCTP_CONNTRACK_MAX; i++)
608 timeouts[i] = sn->timeouts[i];
610 /* there's a 1:1 mapping between attributes and protocol states. */
611 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
613 timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
620 sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
622 const unsigned int *timeouts = data;
625 for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
626 if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
627 goto nla_put_failure;
635 static const struct nla_policy
636 sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
637 [CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
638 [CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
639 [CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
640 [CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
641 [CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
642 [CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
643 [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
644 [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
645 [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
647 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
651 static struct ctl_table sctp_sysctl_table[] = {
653 .procname = "nf_conntrack_sctp_timeout_closed",
654 .maxlen = sizeof(unsigned int),
656 .proc_handler = proc_dointvec_jiffies,
659 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
660 .maxlen = sizeof(unsigned int),
662 .proc_handler = proc_dointvec_jiffies,
665 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
666 .maxlen = sizeof(unsigned int),
668 .proc_handler = proc_dointvec_jiffies,
671 .procname = "nf_conntrack_sctp_timeout_established",
672 .maxlen = sizeof(unsigned int),
674 .proc_handler = proc_dointvec_jiffies,
677 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
678 .maxlen = sizeof(unsigned int),
680 .proc_handler = proc_dointvec_jiffies,
683 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
684 .maxlen = sizeof(unsigned int),
686 .proc_handler = proc_dointvec_jiffies,
689 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
690 .maxlen = sizeof(unsigned int),
692 .proc_handler = proc_dointvec_jiffies,
695 .procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
696 .maxlen = sizeof(unsigned int),
698 .proc_handler = proc_dointvec_jiffies,
701 .procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
702 .maxlen = sizeof(unsigned int),
704 .proc_handler = proc_dointvec_jiffies,
710 static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn,
717 pn->ctl_table = kmemdup(sctp_sysctl_table,
718 sizeof(sctp_sysctl_table),
723 pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
724 pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
725 pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
726 pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
727 pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
728 pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
729 pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
730 pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT];
731 pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED];
736 static int sctp_init_net(struct net *net, u_int16_t proto)
738 struct sctp_net *sn = sctp_pernet(net);
739 struct nf_proto_net *pn = &sn->pn;
744 for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
745 sn->timeouts[i] = sctp_timeouts[i];
748 return sctp_kmemdup_sysctl_table(pn, sn);
751 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
753 .l4proto = IPPROTO_SCTP,
755 .pkt_to_tuple = sctp_pkt_to_tuple,
756 .invert_tuple = sctp_invert_tuple,
757 .print_tuple = sctp_print_tuple,
758 .print_conntrack = sctp_print_conntrack,
759 .packet = sctp_packet,
760 .get_timeouts = sctp_get_timeouts,
763 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
764 .to_nlattr = sctp_to_nlattr,
765 .nlattr_size = sctp_nlattr_size,
766 .from_nlattr = nlattr_to_sctp,
767 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
768 .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
769 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
770 .nla_policy = nf_ct_port_nla_policy,
772 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
774 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
775 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
776 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
777 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
778 .nla_policy = sctp_timeout_nla_policy,
780 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
781 .net_id = &sctp_net_id,
782 .init_net = sctp_init_net,
785 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
787 .l4proto = IPPROTO_SCTP,
789 .pkt_to_tuple = sctp_pkt_to_tuple,
790 .invert_tuple = sctp_invert_tuple,
791 .print_tuple = sctp_print_tuple,
792 .print_conntrack = sctp_print_conntrack,
793 .packet = sctp_packet,
794 .get_timeouts = sctp_get_timeouts,
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 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
807 .nlattr_to_obj = sctp_timeout_nlattr_to_obj,
808 .obj_to_nlattr = sctp_timeout_obj_to_nlattr,
809 .nlattr_max = CTA_TIMEOUT_SCTP_MAX,
810 .obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
811 .nla_policy = sctp_timeout_nla_policy,
813 #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
815 .net_id = &sctp_net_id,
816 .init_net = sctp_init_net,
819 static int sctp_net_init(struct net *net)
823 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp4);
825 pr_err("nf_conntrack_sctp4: pernet registration failed.\n");
828 ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_sctp6);
830 pr_err("nf_conntrack_sctp6: pernet registration failed.\n");
836 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4);
841 static void sctp_net_exit(struct net *net)
843 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp6);
844 nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_sctp4);
847 static struct pernet_operations sctp_net_ops = {
848 .init = sctp_net_init,
849 .exit = sctp_net_exit,
851 .size = sizeof(struct sctp_net),
854 static int __init nf_conntrack_proto_sctp_init(void)
858 ret = register_pernet_subsys(&sctp_net_ops);
862 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp4);
866 ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_sctp6);
872 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
874 unregister_pernet_subsys(&sctp_net_ops);
879 static void __exit nf_conntrack_proto_sctp_fini(void)
881 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
882 nf_ct_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
883 unregister_pernet_subsys(&sctp_net_ops);
886 module_init(nf_conntrack_proto_sctp_init);
887 module_exit(nf_conntrack_proto_sctp_fini);
889 MODULE_LICENSE("GPL");
890 MODULE_AUTHOR("Kiran Kumar Immidi");
891 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
892 MODULE_ALIAS("ip_conntrack_proto_sctp");