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/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
63 /* Global data structures. */
64 struct sctp_globals sctp_globals;
65 struct proc_dir_entry *proc_net_sctp;
66 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
71 /* This is the global socket data structure used for responding to
72 * the Out-of-the-blue (OOTB) packets. A control sock will be created
73 * for this socket at the initialization time.
75 static struct socket *sctp_ctl_socket;
77 static struct sctp_pf *sctp_pf_inet6_specific;
78 static struct sctp_pf *sctp_pf_inet_specific;
79 static struct sctp_af *sctp_af_v4_specific;
80 static struct sctp_af *sctp_af_v6_specific;
82 kmem_cache_t *sctp_chunk_cachep __read_mostly;
83 kmem_cache_t *sctp_bucket_cachep __read_mostly;
85 extern int sctp_snmp_proc_init(void);
86 extern int sctp_snmp_proc_exit(void);
87 extern int sctp_eps_proc_init(void);
88 extern int sctp_eps_proc_exit(void);
89 extern int sctp_assocs_proc_init(void);
90 extern int sctp_assocs_proc_exit(void);
92 /* Return the address of the control sock. */
93 struct sock *sctp_get_ctl_sock(void)
95 return sctp_ctl_socket->sk;
98 /* Set up the proc fs entry for the SCTP protocol. */
99 static __init int sctp_proc_init(void)
101 if (!proc_net_sctp) {
102 struct proc_dir_entry *ent;
103 ent = proc_mkdir("net/sctp", NULL);
105 ent->owner = THIS_MODULE;
111 if (sctp_snmp_proc_init())
113 if (sctp_eps_proc_init())
115 if (sctp_assocs_proc_init())
124 /* Clean up the proc fs entry for the SCTP protocol.
125 * Note: Do not make this __exit as it is used in the init error
128 static void sctp_proc_exit(void)
130 sctp_snmp_proc_exit();
131 sctp_eps_proc_exit();
132 sctp_assocs_proc_exit();
135 proc_net_sctp = NULL;
136 remove_proc_entry("net/sctp", NULL);
140 /* Private helper to extract ipv4 address and stash them in
141 * the protocol structure.
143 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
144 struct net_device *dev)
146 struct in_device *in_dev;
147 struct in_ifaddr *ifa;
148 struct sctp_sockaddr_entry *addr;
151 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
156 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
157 /* Add the address to the local list. */
158 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
160 addr->a.v4.sin_family = AF_INET;
161 addr->a.v4.sin_port = 0;
162 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
163 list_add_tail(&addr->list, addrlist);
170 /* Extract our IP addresses from the system and stash them in the
171 * protocol structure.
173 static void __sctp_get_local_addr_list(void)
175 struct net_device *dev;
176 struct list_head *pos;
179 read_lock(&dev_base_lock);
180 for (dev = dev_base; dev; dev = dev->next) {
181 __list_for_each(pos, &sctp_address_families) {
182 af = list_entry(pos, struct sctp_af, list);
183 af->copy_addrlist(&sctp_local_addr_list, dev);
186 read_unlock(&dev_base_lock);
189 static void sctp_get_local_addr_list(void)
193 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
194 __sctp_get_local_addr_list();
195 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
198 /* Free the existing local addresses. */
199 static void __sctp_free_local_addr_list(void)
201 struct sctp_sockaddr_entry *addr;
202 struct list_head *pos, *temp;
204 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
205 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
211 /* Free the existing local addresses. */
212 static void sctp_free_local_addr_list(void)
216 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
217 __sctp_free_local_addr_list();
218 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
221 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
222 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
223 gfp_t gfp, int copy_flags)
225 struct sctp_sockaddr_entry *addr;
227 struct list_head *pos;
230 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
231 list_for_each(pos, &sctp_local_addr_list) {
232 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
233 if (sctp_in_scope(&addr->a, scope)) {
234 /* Now that the address is in scope, check to see if
235 * the address type is really supported by the local
236 * sock as well as the remote peer.
238 if ((((AF_INET == addr->a.sa.sa_family) &&
239 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
240 (((AF_INET6 == addr->a.sa.sa_family) &&
241 (copy_flags & SCTP_ADDR6_ALLOWED) &&
242 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
243 error = sctp_add_bind_addr(bp, &addr->a,
252 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
256 /* Initialize a sctp_addr from in incoming skb. */
257 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
264 port = &addr->v4.sin_port;
265 addr->v4.sin_family = AF_INET;
267 sh = (struct sctphdr *) skb->h.raw;
269 *port = ntohs(sh->source);
270 from = &skb->nh.iph->saddr;
272 *port = ntohs(sh->dest);
273 from = &skb->nh.iph->daddr;
275 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
278 /* Initialize an sctp_addr from a socket. */
279 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
281 addr->v4.sin_family = AF_INET;
282 addr->v4.sin_port = inet_sk(sk)->num;
283 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
286 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
287 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
289 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
292 /* Initialize sk->sk_daddr from sctp_addr. */
293 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
295 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
298 /* Initialize a sctp_addr from an address parameter. */
299 static void sctp_v4_from_addr_param(union sctp_addr *addr,
300 union sctp_addr_param *param,
303 addr->v4.sin_family = AF_INET;
304 addr->v4.sin_port = port;
305 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
308 /* Initialize an address parameter from a sctp_addr and return the length
309 * of the address parameter.
311 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
312 union sctp_addr_param *param)
314 int length = sizeof(sctp_ipv4addr_param_t);
316 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
317 param->v4.param_hdr.length = ntohs(length);
318 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
323 /* Initialize a sctp_addr from a dst_entry. */
324 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
327 struct rtable *rt = (struct rtable *)dst;
328 saddr->v4.sin_family = AF_INET;
329 saddr->v4.sin_port = port;
330 saddr->v4.sin_addr.s_addr = rt->rt_src;
333 /* Compare two addresses exactly. */
334 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
335 const union sctp_addr *addr2)
337 if (addr1->sa.sa_family != addr2->sa.sa_family)
339 if (addr1->v4.sin_port != addr2->v4.sin_port)
341 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
347 /* Initialize addr struct to INADDR_ANY. */
348 static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
350 addr->v4.sin_family = AF_INET;
351 addr->v4.sin_addr.s_addr = INADDR_ANY;
352 addr->v4.sin_port = port;
355 /* Is this a wildcard address? */
356 static int sctp_v4_is_any(const union sctp_addr *addr)
358 return INADDR_ANY == addr->v4.sin_addr.s_addr;
361 /* This function checks if the address is a valid address to be used for
365 * Return 0 - If the address is a non-unicast or an illegal address.
366 * Return 1 - If the address is a unicast.
368 static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
370 /* Is this a non-unicast address or a unusable SCTP address? */
371 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
377 /* Should this be available for binding? */
378 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
380 int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
383 if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
385 !sp->inet.freebind &&
386 !sysctl_ip_nonlocal_bind)
392 /* Checking the loopback, private and other address scopes as defined in
393 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
394 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
396 * Level 0 - unusable SCTP addresses
397 * Level 1 - loopback address
398 * Level 2 - link-local addresses
399 * Level 3 - private addresses.
400 * Level 4 - global addresses
401 * For INIT and INIT-ACK address list, let L be the level of
402 * of requested destination address, sender and receiver
403 * SHOULD include all of its addresses with level greater
404 * than or equal to L.
406 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
410 /* Should IPv4 scoping be a sysctl configurable option
411 * so users can turn it off (default on) for certain
412 * unconventional networking environments?
415 /* Check for unusable SCTP addresses. */
416 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
417 retval = SCTP_SCOPE_UNUSABLE;
418 } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
419 retval = SCTP_SCOPE_LOOPBACK;
420 } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
421 retval = SCTP_SCOPE_LINK;
422 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
423 retval = SCTP_SCOPE_PRIVATE;
425 retval = SCTP_SCOPE_GLOBAL;
431 /* Returns a valid dst cache entry for the given source and destination ip
432 * addresses. If an association is passed, trys to get a dst entry with a
433 * source address that matches an address in the bind address list.
435 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
436 union sctp_addr *daddr,
437 union sctp_addr *saddr)
441 struct sctp_bind_addr *bp;
443 struct sctp_sockaddr_entry *laddr;
444 struct list_head *pos;
445 struct dst_entry *dst = NULL;
446 union sctp_addr dst_saddr;
448 memset(&fl, 0x0, sizeof(struct flowi));
449 fl.fl4_dst = daddr->v4.sin_addr.s_addr;
450 fl.proto = IPPROTO_SCTP;
452 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
453 fl.oif = asoc->base.sk->sk_bound_dev_if;
456 fl.fl4_src = saddr->v4.sin_addr.s_addr;
458 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
459 __FUNCTION__, NIPQUAD(fl.fl4_dst),
460 NIPQUAD(fl.fl4_src));
462 if (!ip_route_output_key(&rt, &fl)) {
466 /* If there is no association or if a source address is passed, no
467 * more validation is required.
472 bp = &asoc->base.bind_addr;
473 addr_lock = &asoc->base.addr_lock;
476 /* Walk through the bind address list and look for a bind
477 * address that matches the source address of the returned dst.
479 sctp_read_lock(addr_lock);
480 list_for_each(pos, &bp->address_list) {
481 laddr = list_entry(pos, struct sctp_sockaddr_entry,
483 sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
484 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
487 sctp_read_unlock(addr_lock);
489 /* None of the bound addresses match the source address of the
490 * dst. So release it.
496 /* Walk through the bind address list and try to get a dst that
497 * matches a bind address as the source address.
499 sctp_read_lock(addr_lock);
500 list_for_each(pos, &bp->address_list) {
501 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
503 if (AF_INET == laddr->a.sa.sa_family) {
504 fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
505 if (!ip_route_output_key(&rt, &fl)) {
513 sctp_read_unlock(addr_lock);
516 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
517 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
519 SCTP_DEBUG_PRINTK("NO ROUTE\n");
524 /* For v4, the source address is cached in the route entry(dst). So no need
525 * to cache it separately and hence this is an empty routine.
527 static void sctp_v4_get_saddr(struct sctp_association *asoc,
528 struct dst_entry *dst,
529 union sctp_addr *daddr,
530 union sctp_addr *saddr)
532 struct rtable *rt = (struct rtable *)dst;
538 saddr->v4.sin_family = AF_INET;
539 saddr->v4.sin_port = asoc->base.bind_addr.port;
540 saddr->v4.sin_addr.s_addr = rt->rt_src;
544 /* What interface did this skb arrive on? */
545 static int sctp_v4_skb_iif(const struct sk_buff *skb)
547 return ((struct rtable *)skb->dst)->rt_iif;
550 /* Was this packet marked by Explicit Congestion Notification? */
551 static int sctp_v4_is_ce(const struct sk_buff *skb)
553 return INET_ECN_is_ce(skb->nh.iph->tos);
556 /* Create and initialize a new sk for the socket returned by accept(). */
557 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
558 struct sctp_association *asoc)
560 struct inet_sock *inet = inet_sk(sk);
561 struct inet_sock *newinet;
562 struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
567 sock_init_data(NULL, newsk);
569 newsk->sk_type = SOCK_STREAM;
571 newsk->sk_no_check = sk->sk_no_check;
572 newsk->sk_reuse = sk->sk_reuse;
573 newsk->sk_shutdown = sk->sk_shutdown;
575 newsk->sk_destruct = inet_sock_destruct;
576 newsk->sk_family = PF_INET;
577 newsk->sk_protocol = IPPROTO_SCTP;
578 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
579 sock_reset_flag(newsk, SOCK_ZAPPED);
581 newinet = inet_sk(newsk);
583 /* Initialize sk's sport, dport, rcv_saddr and daddr for
584 * getsockname() and getpeername()
586 newinet->sport = inet->sport;
587 newinet->saddr = inet->saddr;
588 newinet->rcv_saddr = inet->rcv_saddr;
589 newinet->dport = htons(asoc->peer.port);
590 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
591 newinet->pmtudisc = inet->pmtudisc;
594 newinet->uc_ttl = -1;
595 newinet->mc_loop = 1;
597 newinet->mc_index = 0;
598 newinet->mc_list = NULL;
600 sk_refcnt_debug_inc(newsk);
602 if (newsk->sk_prot->init(newsk)) {
603 sk_common_release(newsk);
611 /* Map address, empty for v4 family */
612 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
617 /* Dump the v4 addr to the seq file. */
618 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
620 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
623 /* Event handler for inet address addition/deletion events.
624 * Basically, whenever there is an event, we re-build our local address list.
626 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
631 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
632 __sctp_free_local_addr_list();
633 __sctp_get_local_addr_list();
634 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
640 * Initialize the control inode/socket with a control endpoint data
641 * structure. This endpoint is reserved exclusively for the OOTB processing.
643 static int sctp_ctl_sock_init(void)
648 if (sctp_get_pf_specific(PF_INET6))
653 err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
657 "SCTP: Failed to create the SCTP control socket.\n");
660 sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
661 inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
666 /* Register address family specific functions. */
667 int sctp_register_af(struct sctp_af *af)
669 switch (af->sa_family) {
671 if (sctp_af_v4_specific)
673 sctp_af_v4_specific = af;
676 if (sctp_af_v6_specific)
678 sctp_af_v6_specific = af;
684 INIT_LIST_HEAD(&af->list);
685 list_add_tail(&af->list, &sctp_address_families);
689 /* Get the table of functions for manipulating a particular address
692 struct sctp_af *sctp_get_af_specific(sa_family_t family)
696 return sctp_af_v4_specific;
698 return sctp_af_v6_specific;
704 /* Common code to initialize a AF_INET msg_name. */
705 static void sctp_inet_msgname(char *msgname, int *addr_len)
707 struct sockaddr_in *sin;
709 sin = (struct sockaddr_in *)msgname;
710 *addr_len = sizeof(struct sockaddr_in);
711 sin->sin_family = AF_INET;
712 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
715 /* Copy the primary address of the peer primary address as the msg_name. */
716 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
719 struct sockaddr_in *sin, *sinfrom;
722 struct sctp_association *asoc;
725 sctp_inet_msgname(msgname, addr_len);
726 sin = (struct sockaddr_in *)msgname;
727 sinfrom = &asoc->peer.primary_addr.v4;
728 sin->sin_port = htons(asoc->peer.port);
729 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
733 /* Initialize and copy out a msgname from an inbound skb. */
734 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
737 struct sockaddr_in *sin;
740 sctp_inet_msgname(msgname, len);
741 sin = (struct sockaddr_in *)msgname;
742 sh = (struct sctphdr *)skb->h.raw;
743 sin->sin_port = sh->source;
744 sin->sin_addr.s_addr = skb->nh.iph->saddr;
748 /* Do we support this AF? */
749 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
751 /* PF_INET only supports AF_INET addresses. */
752 return (AF_INET == family);
755 /* Address matching with wildcards allowed. */
756 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
757 const union sctp_addr *addr2,
758 struct sctp_sock *opt)
760 /* PF_INET only supports AF_INET addresses. */
761 if (addr1->sa.sa_family != addr2->sa.sa_family)
763 if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
764 INADDR_ANY == addr2->v4.sin_addr.s_addr)
766 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
772 /* Verify that provided sockaddr looks bindable. Common verification has
773 * already been taken care of.
775 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
777 return sctp_v4_available(addr, opt);
780 /* Verify that sockaddr looks sendable. Common verification has already
781 * been taken care of.
783 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
788 /* Fill in Supported Address Type information for INIT and INIT-ACK
789 * chunks. Returns number of addresses supported.
791 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
794 types[0] = SCTP_PARAM_IPV4_ADDRESS;
798 /* Wrapper routine that calls the ip transmit routine. */
799 static inline int sctp_v4_xmit(struct sk_buff *skb,
800 struct sctp_transport *transport, int ipfragok)
802 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
803 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
804 __FUNCTION__, skb, skb->len,
805 NIPQUAD(((struct rtable *)skb->dst)->rt_src),
806 NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
808 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
809 return ip_queue_xmit(skb, ipfragok);
812 static struct sctp_af sctp_ipv4_specific;
814 static struct sctp_pf sctp_pf_inet = {
815 .event_msgname = sctp_inet_event_msgname,
816 .skb_msgname = sctp_inet_skb_msgname,
817 .af_supported = sctp_inet_af_supported,
818 .cmp_addr = sctp_inet_cmp_addr,
819 .bind_verify = sctp_inet_bind_verify,
820 .send_verify = sctp_inet_send_verify,
821 .supported_addrs = sctp_inet_supported_addrs,
822 .create_accept_sk = sctp_v4_create_accept_sk,
823 .addr_v4map = sctp_v4_addr_v4map,
824 .af = &sctp_ipv4_specific,
827 /* Notifier for inetaddr addition/deletion events. */
828 static struct notifier_block sctp_inetaddr_notifier = {
829 .notifier_call = sctp_inetaddr_event,
832 /* Socket operations. */
833 static const struct proto_ops inet_seqpacket_ops = {
835 .owner = THIS_MODULE,
836 .release = inet_release, /* Needs to be wrapped... */
838 .connect = inet_dgram_connect,
839 .socketpair = sock_no_socketpair,
840 .accept = inet_accept,
841 .getname = inet_getname, /* Semantics are different. */
844 .listen = sctp_inet_listen,
845 .shutdown = inet_shutdown, /* Looks harmless. */
846 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
847 .getsockopt = sock_common_getsockopt,
848 .sendmsg = inet_sendmsg,
849 .recvmsg = sock_common_recvmsg,
850 .mmap = sock_no_mmap,
851 .sendpage = sock_no_sendpage,
853 .compat_setsockopt = compat_sock_common_setsockopt,
854 .compat_getsockopt = compat_sock_common_getsockopt,
858 /* Registration with AF_INET family. */
859 static struct inet_protosw sctp_seqpacket_protosw = {
860 .type = SOCK_SEQPACKET,
861 .protocol = IPPROTO_SCTP,
863 .ops = &inet_seqpacket_ops,
866 .flags = SCTP_PROTOSW_FLAG
868 static struct inet_protosw sctp_stream_protosw = {
870 .protocol = IPPROTO_SCTP,
872 .ops = &inet_seqpacket_ops,
875 .flags = SCTP_PROTOSW_FLAG
878 /* Register with IP layer. */
879 static struct net_protocol sctp_protocol = {
881 .err_handler = sctp_v4_err,
885 /* IPv4 address related functions. */
886 static struct sctp_af sctp_ipv4_specific = {
887 .sa_family = AF_INET,
888 .sctp_xmit = sctp_v4_xmit,
889 .setsockopt = ip_setsockopt,
890 .getsockopt = ip_getsockopt,
891 .get_dst = sctp_v4_get_dst,
892 .get_saddr = sctp_v4_get_saddr,
893 .copy_addrlist = sctp_v4_copy_addrlist,
894 .from_skb = sctp_v4_from_skb,
895 .from_sk = sctp_v4_from_sk,
896 .to_sk_saddr = sctp_v4_to_sk_saddr,
897 .to_sk_daddr = sctp_v4_to_sk_daddr,
898 .from_addr_param = sctp_v4_from_addr_param,
899 .to_addr_param = sctp_v4_to_addr_param,
900 .dst_saddr = sctp_v4_dst_saddr,
901 .cmp_addr = sctp_v4_cmp_addr,
902 .addr_valid = sctp_v4_addr_valid,
903 .inaddr_any = sctp_v4_inaddr_any,
904 .is_any = sctp_v4_is_any,
905 .available = sctp_v4_available,
906 .scope = sctp_v4_scope,
907 .skb_iif = sctp_v4_skb_iif,
908 .is_ce = sctp_v4_is_ce,
909 .seq_dump_addr = sctp_v4_seq_dump_addr,
910 .net_header_len = sizeof(struct iphdr),
911 .sockaddr_len = sizeof(struct sockaddr_in),
913 .compat_setsockopt = compat_ip_setsockopt,
914 .compat_getsockopt = compat_ip_getsockopt,
918 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
922 return sctp_pf_inet_specific;
924 return sctp_pf_inet6_specific;
930 /* Register the PF specific function table. */
931 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
935 if (sctp_pf_inet_specific)
937 sctp_pf_inet_specific = pf;
940 if (sctp_pf_inet6_specific)
942 sctp_pf_inet6_specific = pf;
950 static int __init init_sctp_mibs(void)
952 sctp_statistics[0] = alloc_percpu(struct sctp_mib);
953 if (!sctp_statistics[0])
955 sctp_statistics[1] = alloc_percpu(struct sctp_mib);
956 if (!sctp_statistics[1]) {
957 free_percpu(sctp_statistics[0]);
964 static void cleanup_sctp_mibs(void)
966 free_percpu(sctp_statistics[0]);
967 free_percpu(sctp_statistics[1]);
970 /* Initialize the universe into something sensible. */
971 SCTP_STATIC __init int sctp_init(void)
974 int status = -EINVAL;
978 /* SCTP_DEBUG sanity check. */
979 if (!sctp_sanity_check())
982 status = proto_register(&sctp_prot, 1);
986 /* Add SCTP to inet_protos hash table. */
988 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
989 goto err_add_protocol;
991 /* Add SCTP(TCP and UDP style) to inetsw linked list. */
992 inet_register_protosw(&sctp_seqpacket_protosw);
993 inet_register_protosw(&sctp_stream_protosw);
995 /* Allocate a cache pools. */
997 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
998 sizeof(struct sctp_bind_bucket),
999 0, SLAB_HWCACHE_ALIGN,
1002 if (!sctp_bucket_cachep)
1003 goto err_bucket_cachep;
1005 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1006 sizeof(struct sctp_chunk),
1007 0, SLAB_HWCACHE_ALIGN,
1009 if (!sctp_chunk_cachep)
1010 goto err_chunk_cachep;
1012 /* Allocate and initialise sctp mibs. */
1013 status = init_sctp_mibs();
1017 /* Initialize proc fs directory. */
1018 status = sctp_proc_init();
1022 /* Initialize object count debugging. */
1023 sctp_dbg_objcnt_init();
1025 /* Initialize the SCTP specific PF functions. */
1026 sctp_register_pf(&sctp_pf_inet, PF_INET);
1028 * 14. Suggested SCTP Protocol Parameter Values
1030 /* The following protocol parameters are RECOMMENDED: */
1031 /* RTO.Initial - 3 seconds */
1032 sctp_rto_initial = SCTP_RTO_INITIAL;
1033 /* RTO.Min - 1 second */
1034 sctp_rto_min = SCTP_RTO_MIN;
1035 /* RTO.Max - 60 seconds */
1036 sctp_rto_max = SCTP_RTO_MAX;
1037 /* RTO.Alpha - 1/8 */
1038 sctp_rto_alpha = SCTP_RTO_ALPHA;
1039 /* RTO.Beta - 1/4 */
1040 sctp_rto_beta = SCTP_RTO_BETA;
1042 /* Valid.Cookie.Life - 60 seconds */
1043 sctp_valid_cookie_life = 60 * HZ;
1045 /* Whether Cookie Preservative is enabled(1) or not(0) */
1046 sctp_cookie_preserve_enable = 1;
1049 sctp_max_burst = SCTP_MAX_BURST;
1051 /* Association.Max.Retrans - 10 attempts
1052 * Path.Max.Retrans - 5 attempts (per destination address)
1053 * Max.Init.Retransmits - 8 attempts
1055 sctp_max_retrans_association = 10;
1056 sctp_max_retrans_path = 5;
1057 sctp_max_retrans_init = 8;
1059 /* Sendbuffer growth - do per-socket accounting */
1060 sctp_sndbuf_policy = 0;
1062 /* Rcvbuffer growth - do per-socket accounting */
1063 sctp_rcvbuf_policy = 0;
1065 /* HB.interval - 30 seconds */
1066 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1068 /* delayed SACK timeout */
1069 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1071 /* Implementation specific variables. */
1073 /* Initialize default stream count setup information. */
1074 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1075 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1077 /* Initialize handle used for association ids. */
1078 idr_init(&sctp_assocs_id);
1080 /* Size and allocate the association hash table.
1081 * The methodology is similar to that of the tcp hash tables.
1083 if (num_physpages >= (128 * 1024))
1084 goal = num_physpages >> (22 - PAGE_SHIFT);
1086 goal = num_physpages >> (24 - PAGE_SHIFT);
1088 for (order = 0; (1UL << order) < goal; order++)
1092 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1093 sizeof(struct sctp_hashbucket);
1094 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1096 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1097 __get_free_pages(GFP_ATOMIC, order);
1098 } while (!sctp_assoc_hashtable && --order > 0);
1099 if (!sctp_assoc_hashtable) {
1100 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1102 goto err_ahash_alloc;
1104 for (i = 0; i < sctp_assoc_hashsize; i++) {
1105 rwlock_init(&sctp_assoc_hashtable[i].lock);
1106 sctp_assoc_hashtable[i].chain = NULL;
1109 /* Allocate and initialize the endpoint hash table. */
1110 sctp_ep_hashsize = 64;
1111 sctp_ep_hashtable = (struct sctp_hashbucket *)
1112 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1113 if (!sctp_ep_hashtable) {
1114 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1116 goto err_ehash_alloc;
1118 for (i = 0; i < sctp_ep_hashsize; i++) {
1119 rwlock_init(&sctp_ep_hashtable[i].lock);
1120 sctp_ep_hashtable[i].chain = NULL;
1123 /* Allocate and initialize the SCTP port hash table. */
1125 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1126 sizeof(struct sctp_bind_hashbucket);
1127 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1129 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1130 __get_free_pages(GFP_ATOMIC, order);
1131 } while (!sctp_port_hashtable && --order > 0);
1132 if (!sctp_port_hashtable) {
1133 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1135 goto err_bhash_alloc;
1137 for (i = 0; i < sctp_port_hashsize; i++) {
1138 spin_lock_init(&sctp_port_hashtable[i].lock);
1139 sctp_port_hashtable[i].chain = NULL;
1142 spin_lock_init(&sctp_port_alloc_lock);
1143 sctp_port_rover = sysctl_local_port_range[0] - 1;
1145 printk(KERN_INFO "SCTP: Hash tables configured "
1146 "(established %d bind %d)\n",
1147 sctp_assoc_hashsize, sctp_port_hashsize);
1149 /* Disable ADDIP by default. */
1150 sctp_addip_enable = 0;
1152 /* Enable PR-SCTP by default. */
1153 sctp_prsctp_enable = 1;
1155 sctp_sysctl_register();
1157 INIT_LIST_HEAD(&sctp_address_families);
1158 sctp_register_af(&sctp_ipv4_specific);
1160 status = sctp_v6_init();
1164 /* Initialize the control inode/socket for handling OOTB packets. */
1165 if ((status = sctp_ctl_sock_init())) {
1167 "SCTP: Failed to initialize the SCTP control sock.\n");
1168 goto err_ctl_sock_init;
1171 /* Initialize the local address list. */
1172 INIT_LIST_HEAD(&sctp_local_addr_list);
1173 spin_lock_init(&sctp_local_addr_lock);
1175 /* Register notifier for inet address additions/deletions. */
1176 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1178 sctp_get_local_addr_list();
1180 __unsafe(THIS_MODULE);
1187 sctp_sysctl_unregister();
1188 list_del(&sctp_ipv4_specific.list);
1189 free_pages((unsigned long)sctp_port_hashtable,
1190 get_order(sctp_port_hashsize *
1191 sizeof(struct sctp_bind_hashbucket)));
1193 kfree(sctp_ep_hashtable);
1195 free_pages((unsigned long)sctp_assoc_hashtable,
1196 get_order(sctp_assoc_hashsize *
1197 sizeof(struct sctp_hashbucket)));
1199 sctp_dbg_objcnt_exit();
1202 cleanup_sctp_mibs();
1204 kmem_cache_destroy(sctp_chunk_cachep);
1206 kmem_cache_destroy(sctp_bucket_cachep);
1208 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1209 inet_unregister_protosw(&sctp_seqpacket_protosw);
1210 inet_unregister_protosw(&sctp_stream_protosw);
1212 proto_unregister(&sctp_prot);
1216 /* Exit handler for the SCTP protocol. */
1217 SCTP_STATIC __exit void sctp_exit(void)
1219 /* BUG. This should probably do something useful like clean
1220 * up all the remaining associations and all that memory.
1223 /* Unregister notifier for inet address additions/deletions. */
1224 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1226 /* Free the local address list. */
1227 sctp_free_local_addr_list();
1229 /* Free the control endpoint. */
1230 sock_release(sctp_ctl_socket);
1233 sctp_sysctl_unregister();
1234 list_del(&sctp_ipv4_specific.list);
1236 free_pages((unsigned long)sctp_assoc_hashtable,
1237 get_order(sctp_assoc_hashsize *
1238 sizeof(struct sctp_hashbucket)));
1239 kfree(sctp_ep_hashtable);
1240 free_pages((unsigned long)sctp_port_hashtable,
1241 get_order(sctp_port_hashsize *
1242 sizeof(struct sctp_bind_hashbucket)));
1244 kmem_cache_destroy(sctp_chunk_cachep);
1245 kmem_cache_destroy(sctp_bucket_cachep);
1247 sctp_dbg_objcnt_exit();
1249 cleanup_sctp_mibs();
1251 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1252 inet_unregister_protosw(&sctp_seqpacket_protosw);
1253 inet_unregister_protosw(&sctp_stream_protosw);
1254 proto_unregister(&sctp_prot);
1257 module_init(sctp_init);
1258 module_exit(sctp_exit);
1261 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1263 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1264 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1265 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1266 MODULE_LICENSE("GPL");