1 /* SCTP kernel 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 implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * This SCTP 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 * This SCTP 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, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/inetdevice.h>
48 #include <linux/seq_file.h>
49 #include <linux/bootmem.h>
50 #include <linux/highmem.h>
51 #include <linux/swap.h>
52 #include <linux/slab.h>
53 #include <net/net_namespace.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 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
65 /* Global data structures. */
66 struct sctp_globals sctp_globals __read_mostly;
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
71 static struct sctp_pf *sctp_pf_inet6_specific;
72 static struct sctp_pf *sctp_pf_inet_specific;
73 static struct sctp_af *sctp_af_v4_specific;
74 static struct sctp_af *sctp_af_v6_specific;
76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
79 long sysctl_sctp_mem[3];
80 int sysctl_sctp_rmem[3];
81 int sysctl_sctp_wmem[3];
83 /* Set up the proc fs entry for the SCTP protocol. */
84 static int __net_init sctp_proc_init(struct net *net)
87 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
88 if (!net->sctp.proc_net_sctp)
89 goto out_proc_net_sctp;
90 if (sctp_snmp_proc_init(net))
91 goto out_snmp_proc_init;
92 if (sctp_eps_proc_init(net))
93 goto out_eps_proc_init;
94 if (sctp_assocs_proc_init(net))
95 goto out_assocs_proc_init;
96 if (sctp_remaddr_proc_init(net))
97 goto out_remaddr_proc_init;
101 out_remaddr_proc_init:
102 sctp_assocs_proc_exit(net);
103 out_assocs_proc_init:
104 sctp_eps_proc_exit(net);
106 sctp_snmp_proc_exit(net);
108 remove_proc_entry("sctp", net->proc_net);
109 net->sctp.proc_net_sctp = NULL;
112 #endif /* CONFIG_PROC_FS */
116 /* Clean up the proc fs entry for the SCTP protocol.
117 * Note: Do not make this __exit as it is used in the init error
120 static void sctp_proc_exit(struct net *net)
122 #ifdef CONFIG_PROC_FS
123 sctp_snmp_proc_exit(net);
124 sctp_eps_proc_exit(net);
125 sctp_assocs_proc_exit(net);
126 sctp_remaddr_proc_exit(net);
128 remove_proc_entry("sctp", net->proc_net);
129 net->sctp.proc_net_sctp = NULL;
133 /* Private helper to extract ipv4 address and stash them in
134 * the protocol structure.
136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
137 struct net_device *dev)
139 struct in_device *in_dev;
140 struct in_ifaddr *ifa;
141 struct sctp_sockaddr_entry *addr;
144 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
149 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
150 /* Add the address to the local list. */
151 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
153 addr->a.v4.sin_family = AF_INET;
154 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
156 INIT_LIST_HEAD(&addr->list);
157 list_add_tail(&addr->list, addrlist);
164 /* Extract our IP addresses from the system and stash them in the
165 * protocol structure.
167 static void sctp_get_local_addr_list(struct net *net)
169 struct net_device *dev;
170 struct list_head *pos;
174 for_each_netdev_rcu(net, dev) {
175 list_for_each(pos, &sctp_address_families) {
176 af = list_entry(pos, struct sctp_af, list);
177 af->copy_addrlist(&net->sctp.local_addr_list, dev);
183 /* Free the existing local addresses. */
184 static void sctp_free_local_addr_list(struct net *net)
186 struct sctp_sockaddr_entry *addr;
187 struct list_head *pos, *temp;
189 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
190 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
196 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
197 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
198 sctp_scope_t scope, gfp_t gfp, int copy_flags)
200 struct sctp_sockaddr_entry *addr;
204 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
207 if (sctp_in_scope(net, &addr->a, scope)) {
208 /* Now that the address is in scope, check to see if
209 * the address type is really supported by the local
210 * sock as well as the remote peer.
212 if ((((AF_INET == addr->a.sa.sa_family) &&
213 (copy_flags & SCTP_ADDR4_ALLOWED) &&
214 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
215 (((AF_INET6 == addr->a.sa.sa_family) &&
216 (copy_flags & SCTP_ADDR6_ALLOWED) &&
217 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
218 error = sctp_add_bind_addr(bp, &addr->a,
220 SCTP_ADDR_SRC, GFP_ATOMIC);
232 /* Initialize a sctp_addr from in incoming skb. */
233 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
240 port = &addr->v4.sin_port;
241 addr->v4.sin_family = AF_INET;
243 /* Always called on head skb, so this is safe */
247 from = &ip_hdr(skb)->saddr;
250 from = &ip_hdr(skb)->daddr;
252 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
255 /* Initialize an sctp_addr from a socket. */
256 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
258 addr->v4.sin_family = AF_INET;
259 addr->v4.sin_port = 0;
260 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
261 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
264 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
265 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
267 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
270 /* Initialize sk->sk_daddr from sctp_addr. */
271 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
273 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
276 /* Initialize a sctp_addr from an address parameter. */
277 static bool sctp_v4_from_addr_param(union sctp_addr *addr,
278 union sctp_addr_param *param,
279 __be16 port, int iif)
281 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param))
284 addr->v4.sin_family = AF_INET;
285 addr->v4.sin_port = port;
286 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
287 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
292 /* Initialize an address parameter from a sctp_addr and return the length
293 * of the address parameter.
295 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
296 union sctp_addr_param *param)
298 int length = sizeof(sctp_ipv4addr_param_t);
300 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
301 param->v4.param_hdr.length = htons(length);
302 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
307 /* Initialize a sctp_addr from a dst_entry. */
308 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
311 saddr->v4.sin_family = AF_INET;
312 saddr->v4.sin_port = port;
313 saddr->v4.sin_addr.s_addr = fl4->saddr;
314 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
317 /* Compare two addresses exactly. */
318 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
319 const union sctp_addr *addr2)
321 if (addr1->sa.sa_family != addr2->sa.sa_family)
323 if (addr1->v4.sin_port != addr2->v4.sin_port)
325 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
331 /* Initialize addr struct to INADDR_ANY. */
332 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
334 addr->v4.sin_family = AF_INET;
335 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
336 addr->v4.sin_port = port;
337 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
340 /* Is this a wildcard address? */
341 static int sctp_v4_is_any(const union sctp_addr *addr)
343 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
346 /* This function checks if the address is a valid address to be used for
350 * Return 0 - If the address is a non-unicast or an illegal address.
351 * Return 1 - If the address is a unicast.
353 static int sctp_v4_addr_valid(union sctp_addr *addr,
354 struct sctp_sock *sp,
355 const struct sk_buff *skb)
357 /* IPv4 addresses not allowed */
358 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
361 /* Is this a non-unicast address or a unusable SCTP address? */
362 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
365 /* Is this a broadcast address? */
366 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
372 /* Should this be available for binding? */
373 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
375 struct net *net = sock_net(&sp->inet.sk);
376 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
379 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
381 !sp->inet.freebind &&
382 !net->ipv4.sysctl_ip_nonlocal_bind)
385 if (ipv6_only_sock(sctp_opt2sk(sp)))
391 /* Checking the loopback, private and other address scopes as defined in
392 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
393 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
395 * Level 0 - unusable SCTP addresses
396 * Level 1 - loopback address
397 * Level 2 - link-local addresses
398 * Level 3 - private addresses.
399 * Level 4 - global addresses
400 * For INIT and INIT-ACK address list, let L be the level of
401 * of requested destination address, sender and receiver
402 * SHOULD include all of its addresses with level greater
403 * than or equal to L.
405 * IPv4 scoping can be controlled through sysctl option
406 * net.sctp.addr_scope_policy
408 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
412 /* Check for unusable SCTP addresses. */
413 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
414 retval = SCTP_SCOPE_UNUSABLE;
415 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
416 retval = SCTP_SCOPE_LOOPBACK;
417 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
418 retval = SCTP_SCOPE_LINK;
419 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
420 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
421 ipv4_is_private_192(addr->v4.sin_addr.s_addr) ||
422 ipv4_is_test_198(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 void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
436 struct flowi *fl, struct sock *sk)
438 struct sctp_association *asoc = t->asoc;
441 struct flowi4 *fl4 = &_fl.u.ip4;
442 struct sctp_bind_addr *bp;
443 struct sctp_sockaddr_entry *laddr;
444 struct dst_entry *dst = NULL;
445 union sctp_addr *daddr = &t->ipaddr;
446 union sctp_addr dst_saddr;
448 memset(&_fl, 0x0, sizeof(_fl));
449 fl4->daddr = daddr->v4.sin_addr.s_addr;
450 fl4->fl4_dport = daddr->v4.sin_port;
451 fl4->flowi4_proto = IPPROTO_SCTP;
453 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
454 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
455 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
458 fl4->saddr = saddr->v4.sin_addr.s_addr;
459 fl4->fl4_sport = saddr->v4.sin_port;
462 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
465 rt = ip_route_output_key(sock_net(sk), fl4);
469 memcpy(fl, &_fl, sizeof(_fl));
472 /* If there is no association or if a source address is passed, no
473 * more validation is required.
478 bp = &asoc->base.bind_addr;
481 /* Walk through the bind address list and look for a bind
482 * address that matches the source address of the returned dst.
484 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
486 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
487 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
488 (laddr->state != SCTP_ADDR_SRC &&
489 !asoc->src_out_of_asoc_ok))
491 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
496 /* None of the bound addresses match the source address of the
497 * dst. So release it.
503 /* Walk through the bind address list and try to get a dst that
504 * matches a bind address as the source address.
507 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
508 struct net_device *odev;
512 if (laddr->state != SCTP_ADDR_SRC ||
513 AF_INET != laddr->a.sa.sa_family)
516 fl4->fl4_sport = laddr->a.v4.sin_port;
517 flowi4_update_output(fl4,
518 asoc->base.sk->sk_bound_dev_if,
519 RT_CONN_FLAGS(asoc->base.sk),
520 daddr->v4.sin_addr.s_addr,
521 laddr->a.v4.sin_addr.s_addr);
523 rt = ip_route_output_key(sock_net(sk), fl4);
527 /* Ensure the src address belongs to the output
530 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
532 if (!odev || odev->ifindex != fl4->flowi4_oif) {
536 memcpy(fl, &_fl, sizeof(_fl));
538 dst_release(&rt->dst);
546 memcpy(fl, &_fl, sizeof(_fl));
554 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
555 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
558 pr_debug("no route\n");
562 /* For v4, the source address is cached in the route entry(dst). So no need
563 * to cache it separately and hence this is an empty routine.
565 static void sctp_v4_get_saddr(struct sctp_sock *sk,
566 struct sctp_transport *t,
569 union sctp_addr *saddr = &t->saddr;
570 struct rtable *rt = (struct rtable *)t->dst;
573 saddr->v4.sin_family = AF_INET;
574 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
578 /* What interface did this skb arrive on? */
579 static int sctp_v4_skb_iif(const struct sk_buff *skb)
581 return inet_iif(skb);
584 /* Was this packet marked by Explicit Congestion Notification? */
585 static int sctp_v4_is_ce(const struct sk_buff *skb)
587 return INET_ECN_is_ce(ip_hdr(skb)->tos);
590 /* Create and initialize a new sk for the socket returned by accept(). */
591 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
592 struct sctp_association *asoc)
594 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
596 struct inet_sock *newinet;
601 sock_init_data(NULL, newsk);
603 sctp_copy_sock(newsk, sk, asoc);
604 sock_reset_flag(newsk, SOCK_ZAPPED);
606 newinet = inet_sk(newsk);
608 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
610 sk_refcnt_debug_inc(newsk);
612 if (newsk->sk_prot->init(newsk)) {
613 sk_common_release(newsk);
621 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
623 /* No address mapping for V4 sockets */
624 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
625 return sizeof(struct sockaddr_in);
628 /* Dump the v4 addr to the seq file. */
629 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
631 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
634 static void sctp_v4_ecn_capable(struct sock *sk)
639 static void sctp_addr_wq_timeout_handler(unsigned long arg)
641 struct net *net = (struct net *)arg;
642 struct sctp_sockaddr_entry *addrw, *temp;
643 struct sctp_sock *sp;
645 spin_lock_bh(&net->sctp.addr_wq_lock);
647 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
648 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
649 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
650 addrw->state, addrw);
652 #if IS_ENABLED(CONFIG_IPV6)
653 /* Now we send an ASCONF for each association */
654 /* Note. we currently don't handle link local IPv6 addressees */
655 if (addrw->a.sa.sa_family == AF_INET6) {
656 struct in6_addr *in6;
658 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
662 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
663 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
664 addrw->state == SCTP_ADDR_NEW) {
665 unsigned long timeo_val;
667 pr_debug("%s: this is on DAD, trying %d sec "
669 SCTP_ADDRESS_TICK_DELAY);
672 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
673 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
678 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
681 sk = sctp_opt2sk(sp);
682 /* ignore bound-specific endpoints */
683 if (!sctp_is_ep_boundall(sk))
686 if (sctp_asconf_mgmt(sp, addrw) < 0)
687 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
690 #if IS_ENABLED(CONFIG_IPV6)
693 list_del(&addrw->list);
696 spin_unlock_bh(&net->sctp.addr_wq_lock);
699 static void sctp_free_addr_wq(struct net *net)
701 struct sctp_sockaddr_entry *addrw;
702 struct sctp_sockaddr_entry *temp;
704 spin_lock_bh(&net->sctp.addr_wq_lock);
705 del_timer(&net->sctp.addr_wq_timer);
706 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
707 list_del(&addrw->list);
710 spin_unlock_bh(&net->sctp.addr_wq_lock);
713 /* lookup the entry for the same address in the addr_waitq
714 * sctp_addr_wq MUST be locked
716 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
717 struct sctp_sockaddr_entry *addr)
719 struct sctp_sockaddr_entry *addrw;
721 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
722 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
724 if (addrw->a.sa.sa_family == AF_INET) {
725 if (addrw->a.v4.sin_addr.s_addr ==
726 addr->a.v4.sin_addr.s_addr)
728 } else if (addrw->a.sa.sa_family == AF_INET6) {
729 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
730 &addr->a.v6.sin6_addr))
737 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
739 struct sctp_sockaddr_entry *addrw;
740 unsigned long timeo_val;
742 /* first, we check if an opposite message already exist in the queue.
743 * If we found such message, it is removed.
744 * This operation is a bit stupid, but the DHCP client attaches the
745 * new address after a couple of addition and deletion of that address
748 spin_lock_bh(&net->sctp.addr_wq_lock);
749 /* Offsets existing events in addr_wq */
750 addrw = sctp_addr_wq_lookup(net, addr);
752 if (addrw->state != cmd) {
753 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
754 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
755 &net->sctp.addr_waitq);
757 list_del(&addrw->list);
760 spin_unlock_bh(&net->sctp.addr_wq_lock);
764 /* OK, we have to add the new address to the wait queue */
765 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
767 spin_unlock_bh(&net->sctp.addr_wq_lock);
771 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
773 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
774 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
776 if (!timer_pending(&net->sctp.addr_wq_timer)) {
778 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
779 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
781 spin_unlock_bh(&net->sctp.addr_wq_lock);
784 /* Event handler for inet address addition/deletion events.
785 * The sctp_local_addr_list needs to be protocted by a spin lock since
786 * multiple notifiers (say IPv4 and IPv6) may be running at the same
787 * time and thus corrupt the list.
788 * The reader side is protected with RCU.
790 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
793 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
794 struct sctp_sockaddr_entry *addr = NULL;
795 struct sctp_sockaddr_entry *temp;
796 struct net *net = dev_net(ifa->ifa_dev->dev);
801 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
803 addr->a.v4.sin_family = AF_INET;
804 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
806 spin_lock_bh(&net->sctp.local_addr_lock);
807 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
808 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
809 spin_unlock_bh(&net->sctp.local_addr_lock);
813 spin_lock_bh(&net->sctp.local_addr_lock);
814 list_for_each_entry_safe(addr, temp,
815 &net->sctp.local_addr_list, list) {
816 if (addr->a.sa.sa_family == AF_INET &&
817 addr->a.v4.sin_addr.s_addr ==
819 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
822 list_del_rcu(&addr->list);
826 spin_unlock_bh(&net->sctp.local_addr_lock);
828 kfree_rcu(addr, rcu);
836 * Initialize the control inode/socket with a control endpoint data
837 * structure. This endpoint is reserved exclusively for the OOTB processing.
839 static int sctp_ctl_sock_init(struct net *net)
842 sa_family_t family = PF_INET;
844 if (sctp_get_pf_specific(PF_INET6))
847 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
848 SOCK_SEQPACKET, IPPROTO_SCTP, net);
850 /* If IPv6 socket could not be created, try the IPv4 socket */
851 if (err < 0 && family == PF_INET6)
852 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
853 SOCK_SEQPACKET, IPPROTO_SCTP,
857 pr_err("Failed to create the SCTP control socket\n");
863 /* Register address family specific functions. */
864 int sctp_register_af(struct sctp_af *af)
866 switch (af->sa_family) {
868 if (sctp_af_v4_specific)
870 sctp_af_v4_specific = af;
873 if (sctp_af_v6_specific)
875 sctp_af_v6_specific = af;
881 INIT_LIST_HEAD(&af->list);
882 list_add_tail(&af->list, &sctp_address_families);
886 /* Get the table of functions for manipulating a particular address
889 struct sctp_af *sctp_get_af_specific(sa_family_t family)
893 return sctp_af_v4_specific;
895 return sctp_af_v6_specific;
901 /* Common code to initialize a AF_INET msg_name. */
902 static void sctp_inet_msgname(char *msgname, int *addr_len)
904 struct sockaddr_in *sin;
906 sin = (struct sockaddr_in *)msgname;
907 *addr_len = sizeof(struct sockaddr_in);
908 sin->sin_family = AF_INET;
909 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
912 /* Copy the primary address of the peer primary address as the msg_name. */
913 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
916 struct sockaddr_in *sin, *sinfrom;
919 struct sctp_association *asoc;
922 sctp_inet_msgname(msgname, addr_len);
923 sin = (struct sockaddr_in *)msgname;
924 sinfrom = &asoc->peer.primary_addr.v4;
925 sin->sin_port = htons(asoc->peer.port);
926 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
930 /* Initialize and copy out a msgname from an inbound skb. */
931 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
934 struct sctphdr *sh = sctp_hdr(skb);
935 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
937 sctp_inet_msgname(msgname, len);
938 sin->sin_port = sh->source;
939 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
943 /* Do we support this AF? */
944 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
946 /* PF_INET only supports AF_INET addresses. */
947 return AF_INET == family;
950 /* Address matching with wildcards allowed. */
951 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
952 const union sctp_addr *addr2,
953 struct sctp_sock *opt)
955 /* PF_INET only supports AF_INET addresses. */
956 if (addr1->sa.sa_family != addr2->sa.sa_family)
958 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
959 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
961 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
967 /* Verify that provided sockaddr looks bindable. Common verification has
968 * already been taken care of.
970 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
972 return sctp_v4_available(addr, opt);
975 /* Verify that sockaddr looks sendable. Common verification has already
976 * been taken care of.
978 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
983 /* Fill in Supported Address Type information for INIT and INIT-ACK
984 * chunks. Returns number of addresses supported.
986 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
989 types[0] = SCTP_PARAM_IPV4_ADDRESS;
993 /* Wrapper routine that calls the ip transmit routine. */
994 static inline int sctp_v4_xmit(struct sk_buff *skb,
995 struct sctp_transport *transport)
997 struct inet_sock *inet = inet_sk(skb->sk);
999 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
1000 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
1002 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
1003 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
1005 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
1007 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
1010 static struct sctp_af sctp_af_inet;
1012 static struct sctp_pf sctp_pf_inet = {
1013 .event_msgname = sctp_inet_event_msgname,
1014 .skb_msgname = sctp_inet_skb_msgname,
1015 .af_supported = sctp_inet_af_supported,
1016 .cmp_addr = sctp_inet_cmp_addr,
1017 .bind_verify = sctp_inet_bind_verify,
1018 .send_verify = sctp_inet_send_verify,
1019 .supported_addrs = sctp_inet_supported_addrs,
1020 .create_accept_sk = sctp_v4_create_accept_sk,
1021 .addr_to_user = sctp_v4_addr_to_user,
1022 .to_sk_saddr = sctp_v4_to_sk_saddr,
1023 .to_sk_daddr = sctp_v4_to_sk_daddr,
1027 /* Notifier for inetaddr addition/deletion events. */
1028 static struct notifier_block sctp_inetaddr_notifier = {
1029 .notifier_call = sctp_inetaddr_event,
1032 /* Socket operations. */
1033 static const struct proto_ops inet_seqpacket_ops = {
1035 .owner = THIS_MODULE,
1036 .release = inet_release, /* Needs to be wrapped... */
1038 .connect = sctp_inet_connect,
1039 .socketpair = sock_no_socketpair,
1040 .accept = inet_accept,
1041 .getname = inet_getname, /* Semantics are different. */
1043 .ioctl = inet_ioctl,
1044 .listen = sctp_inet_listen,
1045 .shutdown = inet_shutdown, /* Looks harmless. */
1046 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1047 .getsockopt = sock_common_getsockopt,
1048 .sendmsg = inet_sendmsg,
1049 .recvmsg = inet_recvmsg,
1050 .mmap = sock_no_mmap,
1051 .sendpage = sock_no_sendpage,
1052 #ifdef CONFIG_COMPAT
1053 .compat_setsockopt = compat_sock_common_setsockopt,
1054 .compat_getsockopt = compat_sock_common_getsockopt,
1058 /* Registration with AF_INET family. */
1059 static struct inet_protosw sctp_seqpacket_protosw = {
1060 .type = SOCK_SEQPACKET,
1061 .protocol = IPPROTO_SCTP,
1063 .ops = &inet_seqpacket_ops,
1064 .flags = SCTP_PROTOSW_FLAG
1066 static struct inet_protosw sctp_stream_protosw = {
1067 .type = SOCK_STREAM,
1068 .protocol = IPPROTO_SCTP,
1070 .ops = &inet_seqpacket_ops,
1071 .flags = SCTP_PROTOSW_FLAG
1074 /* Register with IP layer. */
1075 static const struct net_protocol sctp_protocol = {
1076 .handler = sctp_rcv,
1077 .err_handler = sctp_v4_err,
1080 .icmp_strict_tag_validation = 1,
1083 /* IPv4 address related functions. */
1084 static struct sctp_af sctp_af_inet = {
1085 .sa_family = AF_INET,
1086 .sctp_xmit = sctp_v4_xmit,
1087 .setsockopt = ip_setsockopt,
1088 .getsockopt = ip_getsockopt,
1089 .get_dst = sctp_v4_get_dst,
1090 .get_saddr = sctp_v4_get_saddr,
1091 .copy_addrlist = sctp_v4_copy_addrlist,
1092 .from_skb = sctp_v4_from_skb,
1093 .from_sk = sctp_v4_from_sk,
1094 .from_addr_param = sctp_v4_from_addr_param,
1095 .to_addr_param = sctp_v4_to_addr_param,
1096 .cmp_addr = sctp_v4_cmp_addr,
1097 .addr_valid = sctp_v4_addr_valid,
1098 .inaddr_any = sctp_v4_inaddr_any,
1099 .is_any = sctp_v4_is_any,
1100 .available = sctp_v4_available,
1101 .scope = sctp_v4_scope,
1102 .skb_iif = sctp_v4_skb_iif,
1103 .is_ce = sctp_v4_is_ce,
1104 .seq_dump_addr = sctp_v4_seq_dump_addr,
1105 .ecn_capable = sctp_v4_ecn_capable,
1106 .net_header_len = sizeof(struct iphdr),
1107 .sockaddr_len = sizeof(struct sockaddr_in),
1108 #ifdef CONFIG_COMPAT
1109 .compat_setsockopt = compat_ip_setsockopt,
1110 .compat_getsockopt = compat_ip_getsockopt,
1114 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1118 return sctp_pf_inet_specific;
1120 return sctp_pf_inet6_specific;
1126 /* Register the PF specific function table. */
1127 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1131 if (sctp_pf_inet_specific)
1133 sctp_pf_inet_specific = pf;
1136 if (sctp_pf_inet6_specific)
1138 sctp_pf_inet6_specific = pf;
1146 static inline int init_sctp_mibs(struct net *net)
1148 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1149 if (!net->sctp.sctp_statistics)
1154 static inline void cleanup_sctp_mibs(struct net *net)
1156 free_percpu(net->sctp.sctp_statistics);
1159 static void sctp_v4_pf_init(void)
1161 /* Initialize the SCTP specific PF functions. */
1162 sctp_register_pf(&sctp_pf_inet, PF_INET);
1163 sctp_register_af(&sctp_af_inet);
1166 static void sctp_v4_pf_exit(void)
1168 list_del(&sctp_af_inet.list);
1171 static int sctp_v4_protosw_init(void)
1175 rc = proto_register(&sctp_prot, 1);
1179 /* Register SCTP(UDP and TCP style) with socket layer. */
1180 inet_register_protosw(&sctp_seqpacket_protosw);
1181 inet_register_protosw(&sctp_stream_protosw);
1186 static void sctp_v4_protosw_exit(void)
1188 inet_unregister_protosw(&sctp_stream_protosw);
1189 inet_unregister_protosw(&sctp_seqpacket_protosw);
1190 proto_unregister(&sctp_prot);
1193 static int sctp_v4_add_protocol(void)
1195 /* Register notifier for inet address additions/deletions. */
1196 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1198 /* Register SCTP with inet layer. */
1199 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1205 static void sctp_v4_del_protocol(void)
1207 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1208 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1211 static int __net_init sctp_defaults_init(struct net *net)
1216 * 14. Suggested SCTP Protocol Parameter Values
1218 /* The following protocol parameters are RECOMMENDED: */
1219 /* RTO.Initial - 3 seconds */
1220 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1221 /* RTO.Min - 1 second */
1222 net->sctp.rto_min = SCTP_RTO_MIN;
1223 /* RTO.Max - 60 seconds */
1224 net->sctp.rto_max = SCTP_RTO_MAX;
1225 /* RTO.Alpha - 1/8 */
1226 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1227 /* RTO.Beta - 1/4 */
1228 net->sctp.rto_beta = SCTP_RTO_BETA;
1230 /* Valid.Cookie.Life - 60 seconds */
1231 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1233 /* Whether Cookie Preservative is enabled(1) or not(0) */
1234 net->sctp.cookie_preserve_enable = 1;
1236 /* Default sctp sockets to use md5 as their hmac alg */
1237 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1238 net->sctp.sctp_hmac_alg = "md5";
1239 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1240 net->sctp.sctp_hmac_alg = "sha1";
1242 net->sctp.sctp_hmac_alg = NULL;
1246 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1248 /* Enable pf state by default */
1249 net->sctp.pf_enable = 1;
1251 /* Association.Max.Retrans - 10 attempts
1252 * Path.Max.Retrans - 5 attempts (per destination address)
1253 * Max.Init.Retransmits - 8 attempts
1255 net->sctp.max_retrans_association = 10;
1256 net->sctp.max_retrans_path = 5;
1257 net->sctp.max_retrans_init = 8;
1259 /* Sendbuffer growth - do per-socket accounting */
1260 net->sctp.sndbuf_policy = 0;
1262 /* Rcvbuffer growth - do per-socket accounting */
1263 net->sctp.rcvbuf_policy = 0;
1265 /* HB.interval - 30 seconds */
1266 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1268 /* delayed SACK timeout */
1269 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1271 /* Disable ADDIP by default. */
1272 net->sctp.addip_enable = 0;
1273 net->sctp.addip_noauth = 0;
1274 net->sctp.default_auto_asconf = 0;
1276 /* Enable PR-SCTP by default. */
1277 net->sctp.prsctp_enable = 1;
1279 /* Disable AUTH by default. */
1280 net->sctp.auth_enable = 0;
1282 /* Set SCOPE policy to enabled */
1283 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1285 /* Set the default rwnd update threshold */
1286 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1288 /* Initialize maximum autoclose timeout. */
1289 net->sctp.max_autoclose = INT_MAX / HZ;
1291 status = sctp_sysctl_net_register(net);
1293 goto err_sysctl_register;
1295 /* Allocate and initialise sctp mibs. */
1296 status = init_sctp_mibs(net);
1300 /* Initialize proc fs directory. */
1301 status = sctp_proc_init(net);
1305 sctp_dbg_objcnt_init(net);
1307 /* Initialize the local address list. */
1308 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1309 spin_lock_init(&net->sctp.local_addr_lock);
1310 sctp_get_local_addr_list(net);
1312 /* Initialize the address event list */
1313 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1314 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1315 spin_lock_init(&net->sctp.addr_wq_lock);
1316 net->sctp.addr_wq_timer.expires = 0;
1317 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1318 (unsigned long)net);
1323 cleanup_sctp_mibs(net);
1325 sctp_sysctl_net_unregister(net);
1326 err_sysctl_register:
1330 static void __net_exit sctp_defaults_exit(struct net *net)
1332 /* Free the local address list */
1333 sctp_free_addr_wq(net);
1334 sctp_free_local_addr_list(net);
1336 sctp_dbg_objcnt_exit(net);
1338 sctp_proc_exit(net);
1339 cleanup_sctp_mibs(net);
1340 sctp_sysctl_net_unregister(net);
1343 static struct pernet_operations sctp_defaults_ops = {
1344 .init = sctp_defaults_init,
1345 .exit = sctp_defaults_exit,
1348 static int __net_init sctp_ctrlsock_init(struct net *net)
1352 /* Initialize the control inode/socket for handling OOTB packets. */
1353 status = sctp_ctl_sock_init(net);
1355 pr_err("Failed to initialize the SCTP control sock\n");
1360 static void __net_exit sctp_ctrlsock_exit(struct net *net)
1362 /* Free the control endpoint. */
1363 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1366 static struct pernet_operations sctp_ctrlsock_ops = {
1367 .init = sctp_ctrlsock_init,
1368 .exit = sctp_ctrlsock_exit,
1371 /* Initialize the universe into something sensible. */
1372 static __init int sctp_init(void)
1375 int status = -EINVAL;
1377 unsigned long limit;
1381 int max_entry_order;
1383 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1385 /* Allocate bind_bucket and chunk caches. */
1387 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1388 sizeof(struct sctp_bind_bucket),
1389 0, SLAB_HWCACHE_ALIGN,
1391 if (!sctp_bucket_cachep)
1394 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1395 sizeof(struct sctp_chunk),
1396 0, SLAB_HWCACHE_ALIGN,
1398 if (!sctp_chunk_cachep)
1399 goto err_chunk_cachep;
1401 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1403 goto err_percpu_counter_init;
1405 /* Implementation specific variables. */
1407 /* Initialize default stream count setup information. */
1408 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1409 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1411 /* Initialize handle used for association ids. */
1412 idr_init(&sctp_assocs_id);
1414 limit = nr_free_buffer_pages() / 8;
1415 limit = max(limit, 128UL);
1416 sysctl_sctp_mem[0] = limit / 4 * 3;
1417 sysctl_sctp_mem[1] = limit;
1418 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1420 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1421 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1422 max_share = min(4UL*1024*1024, limit);
1424 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1425 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1426 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1428 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1429 sysctl_sctp_wmem[1] = 16*1024;
1430 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1432 /* Size and allocate the association hash table.
1433 * The methodology is similar to that of the tcp hash tables.
1434 * Though not identical. Start by getting a goal size
1436 if (totalram_pages >= (128 * 1024))
1437 goal = totalram_pages >> (22 - PAGE_SHIFT);
1439 goal = totalram_pages >> (24 - PAGE_SHIFT);
1441 /* Then compute the page order for said goal */
1442 order = get_order(goal);
1444 /* Now compute the required page order for the maximum sized table we
1447 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1448 sizeof(struct sctp_bind_hashbucket));
1450 /* Limit the page order by that maximum hash table size */
1451 order = min(order, max_entry_order);
1453 /* Allocate and initialize the endpoint hash table. */
1454 sctp_ep_hashsize = 64;
1456 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1457 if (!sctp_ep_hashtable) {
1458 pr_err("Failed endpoint_hash alloc\n");
1460 goto err_ehash_alloc;
1462 for (i = 0; i < sctp_ep_hashsize; i++) {
1463 rwlock_init(&sctp_ep_hashtable[i].lock);
1464 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1467 /* Allocate and initialize the SCTP port hash table.
1468 * Note that order is initalized to start at the max sized
1469 * table we want to support. If we can't get that many pages
1470 * reduce the order and try again
1473 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1474 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1475 } while (!sctp_port_hashtable && --order > 0);
1477 if (!sctp_port_hashtable) {
1478 pr_err("Failed bind hash alloc\n");
1480 goto err_bhash_alloc;
1483 /* Now compute the number of entries that will fit in the
1484 * port hash space we allocated
1486 num_entries = (1UL << order) * PAGE_SIZE /
1487 sizeof(struct sctp_bind_hashbucket);
1489 /* And finish by rounding it down to the nearest power of two
1490 * this wastes some memory of course, but its needed because
1491 * the hash function operates based on the assumption that
1492 * that the number of entries is a power of two
1494 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1496 for (i = 0; i < sctp_port_hashsize; i++) {
1497 spin_lock_init(&sctp_port_hashtable[i].lock);
1498 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1501 status = sctp_transport_hashtable_init();
1503 goto err_thash_alloc;
1505 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1508 sctp_sysctl_register();
1510 INIT_LIST_HEAD(&sctp_address_families);
1514 status = register_pernet_subsys(&sctp_defaults_ops);
1516 goto err_register_defaults;
1518 status = sctp_v4_protosw_init();
1520 goto err_protosw_init;
1522 status = sctp_v6_protosw_init();
1524 goto err_v6_protosw_init;
1526 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1528 goto err_register_ctrlsock;
1530 status = sctp_v4_add_protocol();
1532 goto err_add_protocol;
1534 /* Register SCTP with inet6 layer. */
1535 status = sctp_v6_add_protocol();
1537 goto err_v6_add_protocol;
1539 if (sctp_offload_init() < 0)
1540 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1544 err_v6_add_protocol:
1545 sctp_v4_del_protocol();
1547 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1548 err_register_ctrlsock:
1549 sctp_v6_protosw_exit();
1550 err_v6_protosw_init:
1551 sctp_v4_protosw_exit();
1553 unregister_pernet_subsys(&sctp_defaults_ops);
1554 err_register_defaults:
1557 sctp_sysctl_unregister();
1558 free_pages((unsigned long)sctp_port_hashtable,
1559 get_order(sctp_port_hashsize *
1560 sizeof(struct sctp_bind_hashbucket)));
1562 sctp_transport_hashtable_destroy();
1564 kfree(sctp_ep_hashtable);
1566 percpu_counter_destroy(&sctp_sockets_allocated);
1567 err_percpu_counter_init:
1568 kmem_cache_destroy(sctp_chunk_cachep);
1570 kmem_cache_destroy(sctp_bucket_cachep);
1574 /* Exit handler for the SCTP protocol. */
1575 static __exit void sctp_exit(void)
1577 /* BUG. This should probably do something useful like clean
1578 * up all the remaining associations and all that memory.
1581 /* Unregister with inet6/inet layers. */
1582 sctp_v6_del_protocol();
1583 sctp_v4_del_protocol();
1585 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1587 /* Free protosw registrations */
1588 sctp_v6_protosw_exit();
1589 sctp_v4_protosw_exit();
1591 unregister_pernet_subsys(&sctp_defaults_ops);
1593 /* Unregister with socket layer. */
1597 sctp_sysctl_unregister();
1599 free_pages((unsigned long)sctp_port_hashtable,
1600 get_order(sctp_port_hashsize *
1601 sizeof(struct sctp_bind_hashbucket)));
1602 kfree(sctp_ep_hashtable);
1603 sctp_transport_hashtable_destroy();
1605 percpu_counter_destroy(&sctp_sockets_allocated);
1607 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1609 kmem_cache_destroy(sctp_chunk_cachep);
1610 kmem_cache_destroy(sctp_bucket_cachep);
1613 module_init(sctp_init);
1614 module_exit(sctp_exit);
1617 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1619 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1620 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1621 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1622 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1623 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1624 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1625 MODULE_LICENSE("GPL");