1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel reference Implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * The SCTP reference implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * The SCTP reference implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
49 #include <linux/module.h>
50 #include <linux/init.h>
51 #include <linux/netdevice.h>
52 #include <linux/inetdevice.h>
53 #include <linux/seq_file.h>
54 #include <net/protocol.h>
57 #include <net/sctp/sctp.h>
58 #include <net/addrconf.h>
59 #include <net/inet_common.h>
60 #include <net/inet_ecn.h>
62 /* Global data structures. */
63 struct sctp_globals sctp_globals;
64 struct proc_dir_entry *proc_net_sctp;
65 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics);
67 /* This is the global socket data structure used for responding to
68 * the Out-of-the-blue (OOTB) packets. A control sock will be created
69 * for this socket at the initialization time.
71 static struct socket *sctp_ctl_socket;
73 static struct sctp_pf *sctp_pf_inet6_specific;
74 static struct sctp_pf *sctp_pf_inet_specific;
75 static struct sctp_af *sctp_af_v4_specific;
76 static struct sctp_af *sctp_af_v6_specific;
78 kmem_cache_t *sctp_chunk_cachep;
80 extern struct net_proto_family inet_family_ops;
82 extern int sctp_snmp_proc_init(void);
83 extern int sctp_snmp_proc_exit(void);
84 extern int sctp_eps_proc_init(void);
85 extern int sctp_eps_proc_exit(void);
86 extern int sctp_assocs_proc_init(void);
87 extern int sctp_assocs_proc_exit(void);
89 /* Return the address of the control sock. */
90 struct sock *sctp_get_ctl_sock(void)
92 return sctp_ctl_socket->sk;
95 /* Set up the proc fs entry for the SCTP protocol. */
96 static __init int sctp_proc_init(void)
99 struct proc_dir_entry *ent;
100 ent = proc_mkdir("net/sctp", NULL);
102 ent->owner = THIS_MODULE;
108 if (sctp_snmp_proc_init())
110 if (sctp_eps_proc_init())
112 if (sctp_assocs_proc_init())
121 /* Clean up the proc fs entry for the SCTP protocol.
122 * Note: Do not make this __exit as it is used in the init error
125 static void sctp_proc_exit(void)
127 sctp_snmp_proc_exit();
128 sctp_eps_proc_exit();
129 sctp_assocs_proc_exit();
132 proc_net_sctp = NULL;
133 remove_proc_entry("net/sctp", 0);
137 /* Private helper to extract ipv4 address and stash them in
138 * the protocol structure.
140 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
141 struct net_device *dev)
143 struct in_device *in_dev;
144 struct in_ifaddr *ifa;
145 struct sctp_sockaddr_entry *addr;
147 read_lock(&inetdev_lock);
148 if ((in_dev = __in_dev_get(dev)) == NULL) {
149 read_unlock(&inetdev_lock);
153 read_lock(&in_dev->lock);
154 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
155 /* Add the address to the local list. */
156 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
158 addr->a.v4.sin_family = AF_INET;
159 addr->a.v4.sin_port = 0;
160 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
161 list_add_tail(&addr->list, addrlist);
165 read_unlock(&in_dev->lock);
166 read_unlock(&inetdev_lock);
169 /* Extract our IP addresses from the system and stash them in the
170 * protocol structure.
172 static void __sctp_get_local_addr_list(void)
174 struct net_device *dev;
175 struct list_head *pos;
178 read_lock(&dev_base_lock);
179 for (dev = dev_base; dev; dev = dev->next) {
180 list_for_each(pos, &sctp_address_families) {
181 af = list_entry(pos, struct sctp_af, list);
182 af->copy_addrlist(&sctp_local_addr_list, dev);
185 read_unlock(&dev_base_lock);
188 static void sctp_get_local_addr_list(void)
192 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
193 __sctp_get_local_addr_list();
194 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
197 /* Free the existing local addresses. */
198 static void __sctp_free_local_addr_list(void)
200 struct sctp_sockaddr_entry *addr;
201 struct list_head *pos, *temp;
203 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
204 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
210 /* Free the existing local addresses. */
211 static void sctp_free_local_addr_list(void)
215 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
216 __sctp_free_local_addr_list();
217 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
220 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
221 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
222 int gfp, int copy_flags)
224 struct sctp_sockaddr_entry *addr;
226 struct list_head *pos;
229 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
230 list_for_each(pos, &sctp_local_addr_list) {
231 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
232 if (sctp_in_scope(&addr->a, scope)) {
233 /* Now that the address is in scope, check to see if
234 * the address type is really supported by the local
235 * sock as well as the remote peer.
237 if ((((AF_INET == addr->a.sa.sa_family) &&
238 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
239 (((AF_INET6 == addr->a.sa.sa_family) &&
240 (copy_flags & SCTP_ADDR6_ALLOWED) &&
241 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
242 error = sctp_add_bind_addr(bp, &addr->a,
251 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
255 /* Initialize a sctp_addr from in incoming skb. */
256 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
263 port = &addr->v4.sin_port;
264 addr->v4.sin_family = AF_INET;
266 sh = (struct sctphdr *) skb->h.raw;
268 *port = ntohs(sh->source);
269 from = &skb->nh.iph->saddr;
271 *port = ntohs(sh->dest);
272 from = &skb->nh.iph->daddr;
274 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
277 /* Initialize an sctp_addr from a socket. */
278 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
280 addr->v4.sin_family = AF_INET;
281 addr->v4.sin_port = sk->num;
282 addr->v4.sin_addr.s_addr = sk->rcv_saddr;
285 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
286 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
288 sk->rcv_saddr = addr->v4.sin_addr.s_addr;
291 /* Initialize sk->sk_daddr from sctp_addr. */
292 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
294 sk->daddr = addr->v4.sin_addr.s_addr;
297 /* Initialize a sctp_addr from an address parameter. */
298 static void sctp_v4_from_addr_param(union sctp_addr *addr,
299 union sctp_addr_param *param,
302 addr->v4.sin_family = AF_INET;
303 addr->v4.sin_port = port;
304 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
307 /* Initialize an address parameter from a sctp_addr and return the length
308 * of the address parameter.
310 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
311 union sctp_addr_param *param)
313 int length = sizeof(sctp_ipv4addr_param_t);
315 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
316 param->v4.param_hdr.length = ntohs(length);
317 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
322 /* Initialize a sctp_addr from a dst_entry. */
323 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
326 struct rtable *rt = (struct rtable *)dst;
327 saddr->v4.sin_family = AF_INET;
328 saddr->v4.sin_port = port;
329 saddr->v4.sin_addr.s_addr = rt->rt_src;
332 /* Compare two addresses exactly. */
333 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
334 const union sctp_addr *addr2)
336 if (addr1->sa.sa_family != addr2->sa.sa_family)
338 if (addr1->v4.sin_port != addr2->v4.sin_port)
340 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
346 /* Initialize addr struct to INADDR_ANY. */
347 static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
349 addr->v4.sin_family = AF_INET;
350 addr->v4.sin_addr.s_addr = INADDR_ANY;
351 addr->v4.sin_port = port;
354 /* Is this a wildcard address? */
355 static int sctp_v4_is_any(const union sctp_addr *addr)
357 return INADDR_ANY == addr->v4.sin_addr.s_addr;
360 /* This function checks if the address is a valid address to be used for
364 * Return 0 - If the address is a non-unicast or an illegal address.
365 * Return 1 - If the address is a unicast.
367 static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_opt *sp)
369 /* Is this a non-unicast address or a unusable SCTP address? */
370 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
376 /* Should this be available for binding? */
377 static int sctp_v4_available(union sctp_addr *addr, struct sctp_opt *sp)
379 int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
381 /* FIXME: ip_nonlocal_bind sysctl support. */
383 if (addr->v4.sin_addr.s_addr != INADDR_ANY && ret != RTN_LOCAL)
388 /* Checking the loopback, private and other address scopes as defined in
389 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
390 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
392 * Level 0 - unusable SCTP addresses
393 * Level 1 - loopback address
394 * Level 2 - link-local addresses
395 * Level 3 - private addresses.
396 * Level 4 - global addresses
397 * For INIT and INIT-ACK address list, let L be the level of
398 * of requested destination address, sender and receiver
399 * SHOULD include all of its addresses with level greater
400 * than or equal to L.
402 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
406 /* Should IPv4 scoping be a sysctl configurable option
407 * so users can turn it off (default on) for certain
408 * unconventional networking environments?
411 /* Check for unusable SCTP addresses. */
412 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
413 retval = SCTP_SCOPE_UNUSABLE;
414 } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
415 retval = SCTP_SCOPE_LOOPBACK;
416 } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
417 retval = SCTP_SCOPE_LINK;
418 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
419 retval = SCTP_SCOPE_PRIVATE;
421 retval = SCTP_SCOPE_GLOBAL;
427 /* Returns a valid dst cache entry for the given source and destination ip
428 * addresses. If an association is passed, trys to get a dst entry with a
429 * source address that matches an address in the bind address list.
431 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
432 union sctp_addr *daddr,
433 union sctp_addr *saddr)
437 struct sctp_bind_addr *bp;
439 struct sctp_sockaddr_entry *laddr;
440 struct list_head *pos;
441 struct dst_entry *dst = NULL;
442 union sctp_addr dst_saddr;
444 memset(&key, 0x0, sizeof(struct rt_key));
445 key.dst = daddr->v4.sin_addr.s_addr;
448 key.tos = RT_CONN_FLAGS(asoc->base.sk);
449 key.oif = asoc->base.sk->bound_dev_if;
452 key.src = saddr->v4.sin_addr.s_addr;
454 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
455 __FUNCTION__, NIPQUAD(key.dst),
458 if (!ip_route_output_key(&rt, &key)) {
462 /* If there is no association or if a source address is passed, no
463 * more validation is required.
468 bp = &asoc->base.bind_addr;
469 addr_lock = &asoc->base.addr_lock;
472 /* Walk through the bind address list and look for a bind
473 * address that matches the source address of the returned dst.
475 sctp_read_lock(addr_lock);
476 list_for_each(pos, &bp->address_list) {
477 laddr = list_entry(pos, struct sctp_sockaddr_entry,
479 sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
480 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
483 sctp_read_unlock(addr_lock);
485 /* None of the bound addresses match the source address of the
486 * dst. So release it.
492 /* Walk through the bind address list and try to get a dst that
493 * matches a bind address as the source address.
495 sctp_read_lock(addr_lock);
496 list_for_each(pos, &bp->address_list) {
497 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
499 if (AF_INET == laddr->a.sa.sa_family) {
500 key.src = laddr->a.v4.sin_addr.s_addr;
501 if (!ip_route_output_key(&rt, &key)) {
509 sctp_read_unlock(addr_lock);
512 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
513 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
515 SCTP_DEBUG_PRINTK("NO ROUTE\n");
520 /* For v4, the source address is cached in the route entry(dst). So no need
521 * to cache it separately and hence this is an empty routine.
523 static void sctp_v4_get_saddr(struct sctp_association *asoc,
524 struct dst_entry *dst,
525 union sctp_addr *daddr,
526 union sctp_addr *saddr)
528 struct rtable *rt = (struct rtable *)dst;
531 saddr->v4.sin_family = AF_INET;
532 saddr->v4.sin_port = asoc->base.bind_addr.port;
533 saddr->v4.sin_addr.s_addr = rt->rt_src;
537 /* What interface did this skb arrive on? */
538 static int sctp_v4_skb_iif(const struct sk_buff *skb)
540 return ((struct rtable *)skb->dst)->rt_iif;
543 /* Was this packet marked by Explicit Congestion Notification? */
544 static int sctp_v4_is_ce(const struct sk_buff *skb)
546 return INET_ECN_is_ce(skb->nh.iph->tos);
549 /* Create and initialize a new sk for the socket returned by accept(). */
550 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
551 struct sctp_association *asoc)
554 struct inet_opt *inet = inet_sk(sk);
555 struct inet_opt *newinet;
557 newsk = sk_alloc(PF_INET, GFP_KERNEL, sizeof(struct sock));
561 sock_init_data(NULL, newsk);
562 sk_set_owner(newsk, THIS_MODULE);
564 newsk->type = SOCK_STREAM;
566 newsk->prot = sk->prot;
567 newsk->no_check = sk->no_check;
568 newsk->reuse = sk->reuse;
569 newsk->shutdown = sk->shutdown;
571 newsk->destruct = inet_sock_destruct;
573 newsk->family = PF_INET;
574 newsk->protocol = IPPROTO_SCTP;
575 newsk->backlog_rcv = sk->prot->backlog_rcv;
577 newinet = inet_sk(newsk);
579 /* Initialize sk's sport, dport, rcv_saddr and daddr for
580 * getsockname() and getpeername()
582 newsk->sport = sk->sport;
583 newsk->saddr = sk->saddr;
584 newsk->rcv_saddr = sk->rcv_saddr;
585 newsk->dport = htons(asoc->peer.port);
586 newsk->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
587 newinet->pmtudisc = inet->pmtudisc;
590 newinet->ttl = sysctl_ip_default_ttl;
591 newinet->mc_loop = 1;
593 newinet->mc_index = 0;
594 newinet->mc_list = NULL;
596 #ifdef INET_REFCNT_DEBUG
597 atomic_inc(&inet_sock_nr);
600 if (newsk->prot->init(newsk)) {
601 inet_sock_release(newsk);
609 /* Map address, empty for v4 family */
610 static void sctp_v4_addr_v4map(struct sctp_opt *sp, union sctp_addr *addr)
615 /* Dump the v4 addr to the seq file. */
616 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
618 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
621 /* Event handler for inet address addition/deletion events.
622 * Basically, whenever there is an event, we re-build our local address list.
624 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
629 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
630 __sctp_free_local_addr_list();
631 __sctp_get_local_addr_list();
632 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
638 * Initialize the control inode/socket with a control endpoint data
639 * structure. This endpoint is reserved exclusively for the OOTB processing.
641 static int sctp_ctl_sock_init(void)
646 if (sctp_get_pf_specific(PF_INET6))
651 err = sock_create(family, SOCK_SEQPACKET, IPPROTO_SCTP,
655 "SCTP: Failed to create the SCTP control socket.\n");
658 sctp_ctl_socket->sk->allocation = GFP_ATOMIC;
659 inet_sk(sctp_ctl_socket->sk)->ttl = MAXTTL;
664 /* Register address family specific functions. */
665 int sctp_register_af(struct sctp_af *af)
667 switch (af->sa_family) {
669 if (sctp_af_v4_specific)
671 sctp_af_v4_specific = af;
674 if (sctp_af_v6_specific)
676 sctp_af_v6_specific = af;
682 INIT_LIST_HEAD(&af->list);
683 list_add_tail(&af->list, &sctp_address_families);
687 /* Get the table of functions for manipulating a particular address
690 struct sctp_af *sctp_get_af_specific(sa_family_t family)
694 return sctp_af_v4_specific;
696 return sctp_af_v6_specific;
702 /* Common code to initialize a AF_INET msg_name. */
703 static void sctp_inet_msgname(char *msgname, int *addr_len)
705 struct sockaddr_in *sin;
707 sin = (struct sockaddr_in *)msgname;
708 *addr_len = sizeof(struct sockaddr_in);
709 sin->sin_family = AF_INET;
710 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
713 /* Copy the primary address of the peer primary address as the msg_name. */
714 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
717 struct sockaddr_in *sin, *sinfrom;
720 struct sctp_association *asoc;
723 sctp_inet_msgname(msgname, addr_len);
724 sin = (struct sockaddr_in *)msgname;
725 sinfrom = &asoc->peer.primary_addr.v4;
726 sin->sin_port = htons(asoc->peer.port);
727 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
731 /* Initialize and copy out a msgname from an inbound skb. */
732 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
735 struct sockaddr_in *sin;
738 sctp_inet_msgname(msgname, len);
739 sin = (struct sockaddr_in *)msgname;
740 sh = (struct sctphdr *)skb->h.raw;
741 sin->sin_port = sh->source;
742 sin->sin_addr.s_addr = skb->nh.iph->saddr;
746 /* Do we support this AF? */
747 static int sctp_inet_af_supported(sa_family_t family, struct sctp_opt *sp)
749 /* PF_INET only supports AF_INET addresses. */
750 return (AF_INET == family);
753 /* Address matching with wildcards allowed. */
754 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
755 const union sctp_addr *addr2,
756 struct sctp_opt *opt)
758 /* PF_INET only supports AF_INET addresses. */
759 if (addr1->sa.sa_family != addr2->sa.sa_family)
761 if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
762 INADDR_ANY == addr2->v4.sin_addr.s_addr)
764 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
770 /* Verify that provided sockaddr looks bindable. Common verification has
771 * already been taken care of.
773 static int sctp_inet_bind_verify(struct sctp_opt *opt, union sctp_addr *addr)
775 return sctp_v4_available(addr, opt);
778 /* Verify that sockaddr looks sendable. Common verification has already
779 * been taken care of.
781 static int sctp_inet_send_verify(struct sctp_opt *opt, union sctp_addr *addr)
786 /* Fill in Supported Address Type information for INIT and INIT-ACK
787 * chunks. Returns number of addresses supported.
789 static int sctp_inet_supported_addrs(const struct sctp_opt *opt,
792 types[0] = SCTP_PARAM_IPV4_ADDRESS;
796 /* Wrapper routine that calls the ip transmit routine. */
797 static inline int sctp_v4_xmit(struct sk_buff *skb,
798 struct sctp_transport *transport, int ipfragok)
800 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
801 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
802 __FUNCTION__, skb, skb->len,
803 NIPQUAD(((struct rtable *)skb->dst)->rt_src),
804 NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
806 SCTP_INC_STATS(SctpOutSCTPPacks);
807 return ip_queue_xmit(skb, ipfragok);
810 static struct sctp_af sctp_ipv4_specific;
812 static struct sctp_pf sctp_pf_inet = {
813 .event_msgname = sctp_inet_event_msgname,
814 .skb_msgname = sctp_inet_skb_msgname,
815 .af_supported = sctp_inet_af_supported,
816 .cmp_addr = sctp_inet_cmp_addr,
817 .bind_verify = sctp_inet_bind_verify,
818 .send_verify = sctp_inet_send_verify,
819 .supported_addrs = sctp_inet_supported_addrs,
820 .create_accept_sk = sctp_v4_create_accept_sk,
821 .addr_v4map = sctp_v4_addr_v4map,
822 .af = &sctp_ipv4_specific,
825 /* Notifier for inetaddr addition/deletion events. */
826 static struct notifier_block sctp_inetaddr_notifier = {
827 .notifier_call = sctp_inetaddr_event,
830 /* Socket operations. */
831 static struct proto_ops inet_seqpacket_ops = {
833 .release = inet_release, /* Needs to be wrapped... */
835 .connect = inet_dgram_connect,
836 .socketpair = sock_no_socketpair,
837 .accept = inet_accept,
838 .getname = inet_getname, /* Semantics are different. */
841 .listen = sctp_inet_listen,
842 .shutdown = inet_shutdown, /* Looks harmless. */
843 .setsockopt = inet_setsockopt, /* IP_SOL IP_OPTION is a problem. */
844 .getsockopt = inet_getsockopt,
845 .sendmsg = inet_sendmsg,
846 .recvmsg = inet_recvmsg,
847 .mmap = sock_no_mmap,
848 .sendpage = sock_no_sendpage,
851 /* Registration with AF_INET family. */
852 static struct inet_protosw sctp_seqpacket_protosw = {
853 .type = SOCK_SEQPACKET,
854 .protocol = IPPROTO_SCTP,
856 .ops = &inet_seqpacket_ops,
859 .flags = SCTP_PROTOSW_FLAG
861 static struct inet_protosw sctp_stream_protosw = {
863 .protocol = IPPROTO_SCTP,
865 .ops = &inet_seqpacket_ops,
868 .flags = SCTP_PROTOSW_FLAG
871 /* Register with IP layer. */
872 static struct inet_protocol sctp_protocol = {
874 .err_handler = sctp_v4_err,
875 .protocol = IPPROTO_SCTP,
879 /* IPv4 address related functions. */
880 static struct sctp_af sctp_ipv4_specific = {
881 .sctp_xmit = sctp_v4_xmit,
882 .setsockopt = ip_setsockopt,
883 .getsockopt = ip_getsockopt,
884 .get_dst = sctp_v4_get_dst,
885 .get_saddr = sctp_v4_get_saddr,
886 .copy_addrlist = sctp_v4_copy_addrlist,
887 .from_skb = sctp_v4_from_skb,
888 .from_sk = sctp_v4_from_sk,
889 .to_sk_saddr = sctp_v4_to_sk_saddr,
890 .to_sk_daddr = sctp_v4_to_sk_daddr,
891 .from_addr_param= sctp_v4_from_addr_param,
892 .to_addr_param = sctp_v4_to_addr_param,
893 .dst_saddr = sctp_v4_dst_saddr,
894 .cmp_addr = sctp_v4_cmp_addr,
895 .addr_valid = sctp_v4_addr_valid,
896 .inaddr_any = sctp_v4_inaddr_any,
897 .is_any = sctp_v4_is_any,
898 .available = sctp_v4_available,
899 .scope = sctp_v4_scope,
900 .skb_iif = sctp_v4_skb_iif,
901 .is_ce = sctp_v4_is_ce,
902 .seq_dump_addr = sctp_v4_seq_dump_addr,
903 .net_header_len = sizeof(struct iphdr),
904 .sockaddr_len = sizeof(struct sockaddr_in),
905 .sa_family = AF_INET,
908 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
912 return sctp_pf_inet_specific;
914 return sctp_pf_inet6_specific;
920 /* Register the PF specific function table. */
921 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
925 if (sctp_pf_inet_specific)
927 sctp_pf_inet_specific = pf;
930 if (sctp_pf_inet6_specific)
932 sctp_pf_inet6_specific = pf;
940 static int __init init_sctp_mibs(void)
945 static void cleanup_sctp_mibs(void)
950 /* Initialize the universe into something sensible. */
951 SCTP_STATIC __init int sctp_init(void)
958 /* SCTP_DEBUG sanity check. */
959 if (!sctp_sanity_check())
962 /* Add SCTP to inet_protos hash table. */
963 inet_add_protocol(&sctp_protocol);
965 /* Add SCTP(TCP and UDP style) to inetsw linked list. */
966 inet_register_protosw(&sctp_seqpacket_protosw);
967 inet_register_protosw(&sctp_stream_protosw);
969 /* Allocate cache pools. */
970 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
971 sizeof(struct sctp_chunk),
972 0, SLAB_HWCACHE_ALIGN,
974 if (!sctp_chunk_cachep)
975 goto err_chunk_cachep;
977 /* Allocate and initialise sctp mibs. */
978 status = init_sctp_mibs();
982 /* Initialize proc fs directory. */
987 /* Initialize object count debugging. */
988 sctp_dbg_objcnt_init();
990 /* Initialize the SCTP specific PF functions. */
991 sctp_register_pf(&sctp_pf_inet, PF_INET);
993 * 14. Suggested SCTP Protocol Parameter Values
995 /* The following protocol parameters are RECOMMENDED: */
996 /* RTO.Initial - 3 seconds */
997 sctp_rto_initial = SCTP_RTO_INITIAL;
998 /* RTO.Min - 1 second */
999 sctp_rto_min = SCTP_RTO_MIN;
1000 /* RTO.Max - 60 seconds */
1001 sctp_rto_max = SCTP_RTO_MAX;
1002 /* RTO.Alpha - 1/8 */
1003 sctp_rto_alpha = SCTP_RTO_ALPHA;
1004 /* RTO.Beta - 1/4 */
1005 sctp_rto_beta = SCTP_RTO_BETA;
1006 /* Valid.Cookie.Life - 60 seconds */
1007 sctp_valid_cookie_life = 60 * HZ;
1009 /* Whether Cookie Preservative is enabled(1) or not(0) */
1010 sctp_cookie_preserve_enable = 1;
1013 sctp_max_burst = SCTP_MAX_BURST;
1015 /* Association.Max.Retrans - 10 attempts
1016 * Path.Max.Retrans - 5 attempts (per destination address)
1017 * Max.Init.Retransmits - 8 attempts
1019 sctp_max_retrans_association = 10;
1020 sctp_max_retrans_path = 5;
1021 sctp_max_retrans_init = 8;
1023 /* HB.interval - 30 seconds */
1024 sctp_hb_interval = 30 * HZ;
1026 /* Implementation specific variables. */
1028 /* Initialize default stream count setup information. */
1029 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1030 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1032 /* Size and allocate the association hash table.
1033 * The methodology is similar to that of the tcp hash tables.
1035 if (num_physpages >= (128 * 1024))
1036 goal = num_physpages >> (22 - PAGE_SHIFT);
1038 goal = num_physpages >> (24 - PAGE_SHIFT);
1040 for (order = 0; (1UL << order) < goal; order++)
1044 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1045 sizeof(struct sctp_hashbucket);
1046 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1048 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1049 __get_free_pages(GFP_ATOMIC, order);
1050 } while (!sctp_assoc_hashtable && --order > 0);
1051 if (!sctp_assoc_hashtable) {
1052 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1054 goto err_ahash_alloc;
1056 for (i = 0; i < sctp_assoc_hashsize; i++) {
1057 sctp_assoc_hashtable[i].lock = RW_LOCK_UNLOCKED;
1058 sctp_assoc_hashtable[i].chain = NULL;
1061 /* Allocate and initialize the endpoint hash table. */
1062 sctp_ep_hashsize = 64;
1063 sctp_ep_hashtable = (struct sctp_hashbucket *)
1064 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1065 if (!sctp_ep_hashtable) {
1066 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1068 goto err_ehash_alloc;
1070 for (i = 0; i < sctp_ep_hashsize; i++) {
1071 sctp_ep_hashtable[i].lock = RW_LOCK_UNLOCKED;
1072 sctp_ep_hashtable[i].chain = NULL;
1075 /* Allocate and initialize the SCTP port hash table. */
1077 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1078 sizeof(struct sctp_bind_hashbucket);
1079 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1081 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1082 __get_free_pages(GFP_ATOMIC, order);
1083 } while (!sctp_port_hashtable && --order > 0);
1084 if (!sctp_port_hashtable) {
1085 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1087 goto err_bhash_alloc;
1089 for (i = 0; i < sctp_port_hashsize; i++) {
1090 sctp_port_hashtable[i].lock = SPIN_LOCK_UNLOCKED;
1091 sctp_port_hashtable[i].chain = NULL;
1094 sctp_port_alloc_lock = SPIN_LOCK_UNLOCKED;
1095 sctp_port_rover = sysctl_local_port_range[0] - 1;
1097 printk(KERN_INFO "SCTP: Hash tables configured "
1098 "(established %d bind %d)\n",
1099 sctp_assoc_hashsize, sctp_port_hashsize);
1101 /* Disable ADDIP by default. */
1102 sctp_addip_enable = 0;
1104 /* Enable PR-SCTP by default. */
1105 sctp_prsctp_enable = 1;
1107 sctp_sysctl_register();
1109 INIT_LIST_HEAD(&sctp_address_families);
1110 sctp_register_af(&sctp_ipv4_specific);
1112 status = sctp_v6_init();
1116 /* Initialize the control inode/socket for handling OOTB packets. */
1117 if ((status = sctp_ctl_sock_init())) {
1119 "SCTP: Failed to initialize the SCTP control sock.\n");
1120 goto err_ctl_sock_init;
1123 /* Initialize the local address list. */
1124 INIT_LIST_HEAD(&sctp_local_addr_list);
1125 sctp_local_addr_lock = SPIN_LOCK_UNLOCKED;
1127 /* Register notifier for inet address additions/deletions. */
1128 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1130 sctp_get_local_addr_list();
1132 __unsafe(THIS_MODULE);
1138 sctp_sysctl_unregister();
1139 list_del(&sctp_ipv4_specific.list);
1140 free_pages((unsigned long)sctp_port_hashtable,
1141 get_order(sctp_port_hashsize *
1142 sizeof(struct sctp_bind_hashbucket)));
1144 kfree(sctp_ep_hashtable);
1146 free_pages((unsigned long)sctp_assoc_hashtable,
1147 get_order(sctp_assoc_hashsize *
1148 sizeof(struct sctp_hashbucket)));
1150 sctp_dbg_objcnt_exit();
1153 cleanup_sctp_mibs();
1155 kmem_cache_destroy(sctp_chunk_cachep);
1157 inet_del_protocol(&sctp_protocol);
1158 inet_unregister_protosw(&sctp_seqpacket_protosw);
1159 inet_unregister_protosw(&sctp_stream_protosw);
1163 /* Exit handler for the SCTP protocol. */
1164 SCTP_STATIC __exit void sctp_exit(void)
1166 /* BUG. This should probably do something useful like clean
1167 * up all the remaining associations and all that memory.
1170 /* Unregister notifier for inet address additions/deletions. */
1171 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1173 /* Free the local address list. */
1174 sctp_free_local_addr_list();
1176 /* Free the control endpoint. */
1177 sock_release(sctp_ctl_socket);
1180 sctp_sysctl_unregister();
1181 list_del(&sctp_ipv4_specific.list);
1183 free_pages((unsigned long)sctp_assoc_hashtable,
1184 get_order(sctp_assoc_hashsize *
1185 sizeof(struct sctp_hashbucket)));
1186 kfree(sctp_ep_hashtable);
1187 free_pages((unsigned long)sctp_port_hashtable,
1188 get_order(sctp_port_hashsize *
1189 sizeof(struct sctp_bind_hashbucket)));
1191 kmem_cache_destroy(sctp_chunk_cachep);
1193 sctp_dbg_objcnt_exit();
1195 cleanup_sctp_mibs();
1197 inet_del_protocol(&sctp_protocol);
1198 inet_unregister_protosw(&sctp_seqpacket_protosw);
1199 inet_unregister_protosw(&sctp_stream_protosw);
1202 module_init(sctp_init);
1203 module_exit(sctp_exit);
1205 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1206 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1207 MODULE_LICENSE("GPL");