2 * Connection tracking protocol helper module for SCTP.
4 * SCTP is defined in RFC 2960. References to various sections in this code
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.
12 #include <linux/types.h>
13 #include <linux/timer.h>
14 #include <linux/netfilter.h>
15 #include <linux/module.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>
24 #include <net/netfilter/nf_conntrack.h>
25 #include <net/netfilter/nf_conntrack_l4proto.h>
26 #include <net/netfilter/nf_conntrack_ecache.h>
28 /* Protects conntrack->proto.sctp */
29 static DEFINE_RWLOCK(sctp_lock);
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 *sctp_conntrack_names[] = {
48 #define MINS * 60 SECS
49 #define HOURS * 60 MINS
50 #define DAYS * 24 HOURS
52 static unsigned int nf_ct_sctp_timeout_closed __read_mostly = 10 SECS;
53 static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly = 3 SECS;
54 static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly = 3 SECS;
55 static unsigned int nf_ct_sctp_timeout_established __read_mostly = 5 DAYS;
56 static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly = 300 SECS / 1000;
57 static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly = 300 SECS / 1000;
58 static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
60 static unsigned int * sctp_timeouts[]
61 = { NULL, /* SCTP_CONNTRACK_NONE */
62 &nf_ct_sctp_timeout_closed, /* SCTP_CONNTRACK_CLOSED */
63 &nf_ct_sctp_timeout_cookie_wait, /* SCTP_CONNTRACK_COOKIE_WAIT */
64 &nf_ct_sctp_timeout_cookie_echoed, /* SCTP_CONNTRACK_COOKIE_ECHOED */
65 &nf_ct_sctp_timeout_established, /* SCTP_CONNTRACK_ESTABLISHED */
66 &nf_ct_sctp_timeout_shutdown_sent, /* SCTP_CONNTRACK_SHUTDOWN_SENT */
67 &nf_ct_sctp_timeout_shutdown_recd, /* SCTP_CONNTRACK_SHUTDOWN_RECD */
68 &nf_ct_sctp_timeout_shutdown_ack_sent /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
71 #define sNO SCTP_CONNTRACK_NONE
72 #define sCL SCTP_CONNTRACK_CLOSED
73 #define sCW SCTP_CONNTRACK_COOKIE_WAIT
74 #define sCE SCTP_CONNTRACK_COOKIE_ECHOED
75 #define sES SCTP_CONNTRACK_ESTABLISHED
76 #define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
77 #define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
78 #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
79 #define sIV SCTP_CONNTRACK_MAX
82 These are the descriptions of the states:
84 NOTE: These state names are tantalizingly similar to the states of an
85 SCTP endpoint. But the interpretation of the states is a little different,
86 considering that these are the states of the connection and not of an end
87 point. Please note the subtleties. -Kiran
89 NONE - Nothing so far.
90 COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
91 an INIT_ACK chunk in the reply direction.
92 COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
93 ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
94 SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
95 SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
96 SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
97 to that of the SHUTDOWN chunk.
98 CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
99 the SHUTDOWN chunk. Connection is closed.
103 - I have assumed that the first INIT is in the original direction.
104 This messes things when an INIT comes in the reply direction in CLOSED
106 - Check the error type in the reply dir before transitioning from
107 cookie echoed to closed.
108 - Sec 5.2.4 of RFC 2960
109 - Multi Homing support.
112 /* SCTP conntrack state transitions */
113 static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
116 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
117 /* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
118 /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
119 /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
120 /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
121 /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
122 /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
123 /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
124 /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
125 /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
129 /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
130 /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
131 /* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
132 /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
133 /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
134 /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
135 /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
136 /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
137 /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
138 /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
142 static int sctp_pkt_to_tuple(const struct sk_buff *skb,
143 unsigned int dataoff,
144 struct nf_conntrack_tuple *tuple)
146 sctp_sctphdr_t _hdr, *hp;
148 /* Actually only need first 8 bytes. */
149 hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
153 tuple->src.u.sctp.port = hp->source;
154 tuple->dst.u.sctp.port = hp->dest;
158 static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
159 const struct nf_conntrack_tuple *orig)
161 tuple->src.u.sctp.port = orig->dst.u.sctp.port;
162 tuple->dst.u.sctp.port = orig->src.u.sctp.port;
166 /* Print out the per-protocol part of the tuple. */
167 static int sctp_print_tuple(struct seq_file *s,
168 const struct nf_conntrack_tuple *tuple)
170 return seq_printf(s, "sport=%hu dport=%hu ",
171 ntohs(tuple->src.u.sctp.port),
172 ntohs(tuple->dst.u.sctp.port));
175 /* Print out the private part of the conntrack. */
176 static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
178 enum sctp_conntrack state;
180 read_lock_bh(&sctp_lock);
181 state = ct->proto.sctp.state;
182 read_unlock_bh(&sctp_lock);
184 return seq_printf(s, "%s ", sctp_conntrack_names[state]);
187 #define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
188 for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
189 (offset) < (skb)->len && \
190 ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
191 (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
193 /* Some validity checks to make sure the chunks are fine */
194 static int do_basic_checks(struct nf_conn *ct,
195 const struct sk_buff *skb,
196 unsigned int dataoff,
199 u_int32_t offset, count;
200 sctp_chunkhdr_t _sch, *sch;
205 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
206 pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
208 if (sch->type == SCTP_CID_INIT ||
209 sch->type == SCTP_CID_INIT_ACK ||
210 sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
214 * Cookie Ack/Echo chunks not the first OR
215 * Init / Init Ack / Shutdown compl chunks not the only chunks
218 if (((sch->type == SCTP_CID_COOKIE_ACK ||
219 sch->type == SCTP_CID_COOKIE_ECHO ||
221 count != 0) || !sch->length) {
222 pr_debug("Basic checks failed\n");
227 set_bit(sch->type, map);
230 pr_debug("Basic checks passed\n");
234 static int new_state(enum ip_conntrack_dir dir,
235 enum sctp_conntrack cur_state,
240 pr_debug("Chunk type: %d\n", chunk_type);
242 switch (chunk_type) {
244 pr_debug("SCTP_CID_INIT\n");
247 case SCTP_CID_INIT_ACK:
248 pr_debug("SCTP_CID_INIT_ACK\n");
252 pr_debug("SCTP_CID_ABORT\n");
255 case SCTP_CID_SHUTDOWN:
256 pr_debug("SCTP_CID_SHUTDOWN\n");
259 case SCTP_CID_SHUTDOWN_ACK:
260 pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
264 pr_debug("SCTP_CID_ERROR\n");
267 case SCTP_CID_COOKIE_ECHO:
268 pr_debug("SCTP_CID_COOKIE_ECHO\n");
271 case SCTP_CID_COOKIE_ACK:
272 pr_debug("SCTP_CID_COOKIE_ACK\n");
275 case SCTP_CID_SHUTDOWN_COMPLETE:
276 pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
280 /* Other chunks like DATA, SACK, HEARTBEAT and
281 its ACK do not cause a change in state */
282 pr_debug("Unknown chunk type, Will stay in %s\n",
283 sctp_conntrack_names[cur_state]);
287 pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
288 dir, sctp_conntrack_names[cur_state], chunk_type,
289 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
291 return sctp_conntracks[dir][i][cur_state];
294 /* Returns verdict for packet, or -NF_ACCEPT for invalid. */
295 static int sctp_packet(struct nf_conn *ct,
296 const struct sk_buff *skb,
297 unsigned int dataoff,
298 enum ip_conntrack_info ctinfo,
300 unsigned int hooknum)
302 enum sctp_conntrack newconntrack, oldsctpstate;
303 enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
304 sctp_sctphdr_t _sctph, *sh;
305 sctp_chunkhdr_t _sch, *sch;
306 u_int32_t offset, count;
307 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
309 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
313 if (do_basic_checks(ct, skb, dataoff, map) != 0)
316 /* Check the verification tag (Sec 8.5) */
317 if (!test_bit(SCTP_CID_INIT, map) &&
318 !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
319 !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
320 !test_bit(SCTP_CID_ABORT, map) &&
321 !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
322 sh->vtag != ct->proto.sctp.vtag[dir]) {
323 pr_debug("Verification tag check failed\n");
327 oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
328 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
329 write_lock_bh(&sctp_lock);
331 /* Special cases of Verification tag check (Sec 8.5.1) */
332 if (sch->type == SCTP_CID_INIT) {
336 } else if (sch->type == SCTP_CID_ABORT) {
338 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
339 sh->vtag != ct->proto.sctp.vtag[!dir])
341 } else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
343 if (sh->vtag != ct->proto.sctp.vtag[dir] &&
344 sh->vtag != ct->proto.sctp.vtag[!dir] &&
347 } else if (sch->type == SCTP_CID_COOKIE_ECHO) {
349 if (sh->vtag != ct->proto.sctp.vtag[dir])
353 oldsctpstate = ct->proto.sctp.state;
354 newconntrack = new_state(dir, oldsctpstate, sch->type);
357 if (newconntrack == SCTP_CONNTRACK_MAX) {
358 pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
360 dir, sch->type, oldsctpstate);
364 /* If it is an INIT or an INIT ACK note down the vtag */
365 if (sch->type == SCTP_CID_INIT ||
366 sch->type == SCTP_CID_INIT_ACK) {
367 sctp_inithdr_t _inithdr, *ih;
369 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
370 sizeof(_inithdr), &_inithdr);
373 pr_debug("Setting vtag %x for dir %d\n",
375 ct->proto.sctp.vtag[!dir] = ih->init_tag;
378 ct->proto.sctp.state = newconntrack;
379 if (oldsctpstate != newconntrack)
380 nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
381 write_unlock_bh(&sctp_lock);
384 nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[newconntrack]);
386 if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
387 dir == IP_CT_DIR_REPLY &&
388 newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
389 pr_debug("Setting assured bit\n");
390 set_bit(IPS_ASSURED_BIT, &ct->status);
391 nf_conntrack_event_cache(IPCT_STATUS, skb);
397 write_unlock_bh(&sctp_lock);
402 /* Called when a new connection for this protocol found. */
403 static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
404 unsigned int dataoff)
406 enum sctp_conntrack newconntrack;
407 sctp_sctphdr_t _sctph, *sh;
408 sctp_chunkhdr_t _sch, *sch;
409 u_int32_t offset, count;
410 unsigned long map[256 / sizeof(unsigned long)] = { 0 };
412 sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
416 if (do_basic_checks(ct, skb, dataoff, map) != 0)
419 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
420 if (test_bit(SCTP_CID_ABORT, map) ||
421 test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
422 test_bit(SCTP_CID_COOKIE_ACK, map))
425 newconntrack = SCTP_CONNTRACK_MAX;
426 for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
427 /* Don't need lock here: this conntrack not in circulation yet */
428 newconntrack = new_state(IP_CT_DIR_ORIGINAL,
429 SCTP_CONNTRACK_NONE, sch->type);
431 /* Invalid: delete conntrack */
432 if (newconntrack == SCTP_CONNTRACK_NONE ||
433 newconntrack == SCTP_CONNTRACK_MAX) {
434 pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
438 /* Copy the vtag into the state info */
439 if (sch->type == SCTP_CID_INIT) {
441 sctp_inithdr_t _inithdr, *ih;
443 ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
444 sizeof(_inithdr), &_inithdr);
448 pr_debug("Setting vtag %x for new conn\n",
451 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
458 /* If it is a shutdown ack OOTB packet, we expect a return
459 shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
461 pr_debug("Setting vtag %x for new conn OOTB\n",
463 ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
466 ct->proto.sctp.state = newconntrack;
473 static unsigned int sctp_sysctl_table_users;
474 static struct ctl_table_header *sctp_sysctl_header;
475 static struct ctl_table sctp_sysctl_table[] = {
477 .procname = "nf_conntrack_sctp_timeout_closed",
478 .data = &nf_ct_sctp_timeout_closed,
479 .maxlen = sizeof(unsigned int),
481 .proc_handler = &proc_dointvec_jiffies,
484 .procname = "nf_conntrack_sctp_timeout_cookie_wait",
485 .data = &nf_ct_sctp_timeout_cookie_wait,
486 .maxlen = sizeof(unsigned int),
488 .proc_handler = &proc_dointvec_jiffies,
491 .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
492 .data = &nf_ct_sctp_timeout_cookie_echoed,
493 .maxlen = sizeof(unsigned int),
495 .proc_handler = &proc_dointvec_jiffies,
498 .procname = "nf_conntrack_sctp_timeout_established",
499 .data = &nf_ct_sctp_timeout_established,
500 .maxlen = sizeof(unsigned int),
502 .proc_handler = &proc_dointvec_jiffies,
505 .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
506 .data = &nf_ct_sctp_timeout_shutdown_sent,
507 .maxlen = sizeof(unsigned int),
509 .proc_handler = &proc_dointvec_jiffies,
512 .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
513 .data = &nf_ct_sctp_timeout_shutdown_recd,
514 .maxlen = sizeof(unsigned int),
516 .proc_handler = &proc_dointvec_jiffies,
519 .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
520 .data = &nf_ct_sctp_timeout_shutdown_ack_sent,
521 .maxlen = sizeof(unsigned int),
523 .proc_handler = &proc_dointvec_jiffies,
530 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
531 static struct ctl_table sctp_compat_sysctl_table[] = {
533 .procname = "ip_conntrack_sctp_timeout_closed",
534 .data = &nf_ct_sctp_timeout_closed,
535 .maxlen = sizeof(unsigned int),
537 .proc_handler = &proc_dointvec_jiffies,
540 .procname = "ip_conntrack_sctp_timeout_cookie_wait",
541 .data = &nf_ct_sctp_timeout_cookie_wait,
542 .maxlen = sizeof(unsigned int),
544 .proc_handler = &proc_dointvec_jiffies,
547 .procname = "ip_conntrack_sctp_timeout_cookie_echoed",
548 .data = &nf_ct_sctp_timeout_cookie_echoed,
549 .maxlen = sizeof(unsigned int),
551 .proc_handler = &proc_dointvec_jiffies,
554 .procname = "ip_conntrack_sctp_timeout_established",
555 .data = &nf_ct_sctp_timeout_established,
556 .maxlen = sizeof(unsigned int),
558 .proc_handler = &proc_dointvec_jiffies,
561 .procname = "ip_conntrack_sctp_timeout_shutdown_sent",
562 .data = &nf_ct_sctp_timeout_shutdown_sent,
563 .maxlen = sizeof(unsigned int),
565 .proc_handler = &proc_dointvec_jiffies,
568 .procname = "ip_conntrack_sctp_timeout_shutdown_recd",
569 .data = &nf_ct_sctp_timeout_shutdown_recd,
570 .maxlen = sizeof(unsigned int),
572 .proc_handler = &proc_dointvec_jiffies,
575 .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
576 .data = &nf_ct_sctp_timeout_shutdown_ack_sent,
577 .maxlen = sizeof(unsigned int),
579 .proc_handler = &proc_dointvec_jiffies,
585 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
588 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
590 .l4proto = IPPROTO_SCTP,
592 .pkt_to_tuple = sctp_pkt_to_tuple,
593 .invert_tuple = sctp_invert_tuple,
594 .print_tuple = sctp_print_tuple,
595 .print_conntrack = sctp_print_conntrack,
596 .packet = sctp_packet,
599 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
600 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
601 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
602 .nla_policy = nf_ct_port_nla_policy,
605 .ctl_table_users = &sctp_sysctl_table_users,
606 .ctl_table_header = &sctp_sysctl_header,
607 .ctl_table = sctp_sysctl_table,
608 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
609 .ctl_compat_table = sctp_compat_sysctl_table,
614 static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
616 .l4proto = IPPROTO_SCTP,
618 .pkt_to_tuple = sctp_pkt_to_tuple,
619 .invert_tuple = sctp_invert_tuple,
620 .print_tuple = sctp_print_tuple,
621 .print_conntrack = sctp_print_conntrack,
622 .packet = sctp_packet,
625 #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
626 .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
627 .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
628 .nla_policy = nf_ct_port_nla_policy,
631 .ctl_table_users = &sctp_sysctl_table_users,
632 .ctl_table_header = &sctp_sysctl_header,
633 .ctl_table = sctp_sysctl_table,
637 int __init nf_conntrack_proto_sctp_init(void)
641 ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
643 printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
646 ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
648 printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
655 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
660 void __exit nf_conntrack_proto_sctp_fini(void)
662 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
663 nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
666 module_init(nf_conntrack_proto_sctp_init);
667 module_exit(nf_conntrack_proto_sctp_fini);
669 MODULE_LICENSE("GPL");
670 MODULE_AUTHOR("Kiran Kumar Immidi");
671 MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
672 MODULE_ALIAS("ip_conntrack_proto_sctp");