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 /* Global data structures. */
64 struct sctp_globals sctp_globals __read_mostly;
66 struct idr sctp_assocs_id;
67 DEFINE_SPINLOCK(sctp_assocs_id_lock);
69 static struct sctp_pf *sctp_pf_inet6_specific;
70 static struct sctp_pf *sctp_pf_inet_specific;
71 static struct sctp_af *sctp_af_v4_specific;
72 static struct sctp_af *sctp_af_v6_specific;
74 struct kmem_cache *sctp_chunk_cachep __read_mostly;
75 struct kmem_cache *sctp_bucket_cachep __read_mostly;
77 long sysctl_sctp_mem[3];
78 int sysctl_sctp_rmem[3];
79 int sysctl_sctp_wmem[3];
81 /* Set up the proc fs entry for the SCTP protocol. */
82 static int __net_init sctp_proc_init(struct net *net)
85 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
86 if (!net->sctp.proc_net_sctp)
87 goto out_proc_net_sctp;
88 if (sctp_snmp_proc_init(net))
89 goto out_snmp_proc_init;
90 if (sctp_eps_proc_init(net))
91 goto out_eps_proc_init;
92 if (sctp_assocs_proc_init(net))
93 goto out_assocs_proc_init;
94 if (sctp_remaddr_proc_init(net))
95 goto out_remaddr_proc_init;
99 out_remaddr_proc_init:
100 sctp_assocs_proc_exit(net);
101 out_assocs_proc_init:
102 sctp_eps_proc_exit(net);
104 sctp_snmp_proc_exit(net);
106 remove_proc_entry("sctp", net->proc_net);
107 net->sctp.proc_net_sctp = NULL;
110 #endif /* CONFIG_PROC_FS */
114 /* Clean up the proc fs entry for the SCTP protocol.
115 * Note: Do not make this __exit as it is used in the init error
118 static void sctp_proc_exit(struct net *net)
120 #ifdef CONFIG_PROC_FS
121 sctp_snmp_proc_exit(net);
122 sctp_eps_proc_exit(net);
123 sctp_assocs_proc_exit(net);
124 sctp_remaddr_proc_exit(net);
126 remove_proc_entry("sctp", net->proc_net);
127 net->sctp.proc_net_sctp = NULL;
131 /* Private helper to extract ipv4 address and stash them in
132 * the protocol structure.
134 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
135 struct net_device *dev)
137 struct in_device *in_dev;
138 struct in_ifaddr *ifa;
139 struct sctp_sockaddr_entry *addr;
142 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
147 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
148 /* Add the address to the local list. */
149 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
151 addr->a.v4.sin_family = AF_INET;
152 addr->a.v4.sin_port = 0;
153 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
155 INIT_LIST_HEAD(&addr->list);
156 list_add_tail(&addr->list, addrlist);
163 /* Extract our IP addresses from the system and stash them in the
164 * protocol structure.
166 static void sctp_get_local_addr_list(struct net *net)
168 struct net_device *dev;
169 struct list_head *pos;
173 for_each_netdev_rcu(net, dev) {
174 list_for_each(pos, &sctp_address_families) {
175 af = list_entry(pos, struct sctp_af, list);
176 af->copy_addrlist(&net->sctp.local_addr_list, dev);
182 /* Free the existing local addresses. */
183 static void sctp_free_local_addr_list(struct net *net)
185 struct sctp_sockaddr_entry *addr;
186 struct list_head *pos, *temp;
188 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
189 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
195 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
196 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
197 sctp_scope_t scope, gfp_t gfp, int copy_flags)
199 struct sctp_sockaddr_entry *addr;
203 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
206 if (sctp_in_scope(net, &addr->a, scope)) {
207 /* Now that the address is in scope, check to see if
208 * the address type is really supported by the local
209 * sock as well as the remote peer.
211 if ((((AF_INET == addr->a.sa.sa_family) &&
212 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
213 (((AF_INET6 == addr->a.sa.sa_family) &&
214 (copy_flags & SCTP_ADDR6_ALLOWED) &&
215 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
216 error = sctp_add_bind_addr(bp, &addr->a,
217 SCTP_ADDR_SRC, GFP_ATOMIC);
229 /* Initialize a sctp_addr from in incoming skb. */
230 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
237 port = &addr->v4.sin_port;
238 addr->v4.sin_family = AF_INET;
243 from = &ip_hdr(skb)->saddr;
246 from = &ip_hdr(skb)->daddr;
248 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
251 /* Initialize an sctp_addr from a socket. */
252 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
254 addr->v4.sin_family = AF_INET;
255 addr->v4.sin_port = 0;
256 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
259 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
260 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
262 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
265 /* Initialize sk->sk_daddr from sctp_addr. */
266 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
268 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
271 /* Initialize a sctp_addr from an address parameter. */
272 static void sctp_v4_from_addr_param(union sctp_addr *addr,
273 union sctp_addr_param *param,
274 __be16 port, int iif)
276 addr->v4.sin_family = AF_INET;
277 addr->v4.sin_port = port;
278 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
281 /* Initialize an address parameter from a sctp_addr and return the length
282 * of the address parameter.
284 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
285 union sctp_addr_param *param)
287 int length = sizeof(sctp_ipv4addr_param_t);
289 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
290 param->v4.param_hdr.length = htons(length);
291 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
296 /* Initialize a sctp_addr from a dst_entry. */
297 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
300 saddr->v4.sin_family = AF_INET;
301 saddr->v4.sin_port = port;
302 saddr->v4.sin_addr.s_addr = fl4->saddr;
305 /* Compare two addresses exactly. */
306 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
307 const union sctp_addr *addr2)
309 if (addr1->sa.sa_family != addr2->sa.sa_family)
311 if (addr1->v4.sin_port != addr2->v4.sin_port)
313 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
319 /* Initialize addr struct to INADDR_ANY. */
320 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
322 addr->v4.sin_family = AF_INET;
323 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
324 addr->v4.sin_port = port;
327 /* Is this a wildcard address? */
328 static int sctp_v4_is_any(const union sctp_addr *addr)
330 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
333 /* This function checks if the address is a valid address to be used for
337 * Return 0 - If the address is a non-unicast or an illegal address.
338 * Return 1 - If the address is a unicast.
340 static int sctp_v4_addr_valid(union sctp_addr *addr,
341 struct sctp_sock *sp,
342 const struct sk_buff *skb)
344 /* IPv4 addresses not allowed */
345 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
348 /* Is this a non-unicast address or a unusable SCTP address? */
349 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
352 /* Is this a broadcast address? */
353 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
359 /* Should this be available for binding? */
360 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
362 struct net *net = sock_net(&sp->inet.sk);
363 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
366 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
368 !sp->inet.freebind &&
369 !net->ipv4.sysctl_ip_nonlocal_bind)
372 if (ipv6_only_sock(sctp_opt2sk(sp)))
378 /* Checking the loopback, private and other address scopes as defined in
379 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
380 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
382 * Level 0 - unusable SCTP addresses
383 * Level 1 - loopback address
384 * Level 2 - link-local addresses
385 * Level 3 - private addresses.
386 * Level 4 - global addresses
387 * For INIT and INIT-ACK address list, let L be the level of
388 * of requested destination address, sender and receiver
389 * SHOULD include all of its addresses with level greater
390 * than or equal to L.
392 * IPv4 scoping can be controlled through sysctl option
393 * net.sctp.addr_scope_policy
395 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
399 /* Check for unusable SCTP addresses. */
400 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
401 retval = SCTP_SCOPE_UNUSABLE;
402 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
403 retval = SCTP_SCOPE_LOOPBACK;
404 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
405 retval = SCTP_SCOPE_LINK;
406 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
407 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
408 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
409 retval = SCTP_SCOPE_PRIVATE;
411 retval = SCTP_SCOPE_GLOBAL;
417 /* Returns a valid dst cache entry for the given source and destination ip
418 * addresses. If an association is passed, trys to get a dst entry with a
419 * source address that matches an address in the bind address list.
421 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
422 struct flowi *fl, struct sock *sk)
424 struct sctp_association *asoc = t->asoc;
426 struct flowi4 *fl4 = &fl->u.ip4;
427 struct sctp_bind_addr *bp;
428 struct sctp_sockaddr_entry *laddr;
429 struct dst_entry *dst = NULL;
430 union sctp_addr *daddr = &t->ipaddr;
431 union sctp_addr dst_saddr;
433 memset(fl4, 0x0, sizeof(struct flowi4));
434 fl4->daddr = daddr->v4.sin_addr.s_addr;
435 fl4->fl4_dport = daddr->v4.sin_port;
436 fl4->flowi4_proto = IPPROTO_SCTP;
438 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
439 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
440 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
443 fl4->saddr = saddr->v4.sin_addr.s_addr;
444 fl4->fl4_sport = saddr->v4.sin_port;
447 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
450 rt = ip_route_output_key(sock_net(sk), fl4);
454 /* If there is no association or if a source address is passed, no
455 * more validation is required.
460 bp = &asoc->base.bind_addr;
463 /* Walk through the bind address list and look for a bind
464 * address that matches the source address of the returned dst.
466 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
468 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
469 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
470 (laddr->state != SCTP_ADDR_SRC &&
471 !asoc->src_out_of_asoc_ok))
473 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
478 /* None of the bound addresses match the source address of the
479 * dst. So release it.
485 /* Walk through the bind address list and try to get a dst that
486 * matches a bind address as the source address.
489 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
490 struct net_device *odev;
494 if (laddr->state != SCTP_ADDR_SRC ||
495 AF_INET != laddr->a.sa.sa_family)
498 fl4->fl4_sport = laddr->a.v4.sin_port;
499 flowi4_update_output(fl4,
500 asoc->base.sk->sk_bound_dev_if,
501 RT_CONN_FLAGS(asoc->base.sk),
502 daddr->v4.sin_addr.s_addr,
503 laddr->a.v4.sin_addr.s_addr);
505 rt = ip_route_output_key(sock_net(sk), fl4);
509 /* Ensure the src address belongs to the output
512 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
514 if (!odev || odev->ifindex != fl4->flowi4_oif)
526 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
527 &fl4->daddr, &fl4->saddr);
529 pr_debug("no route\n");
532 /* For v4, the source address is cached in the route entry(dst). So no need
533 * to cache it separately and hence this is an empty routine.
535 static void sctp_v4_get_saddr(struct sctp_sock *sk,
536 struct sctp_transport *t,
539 union sctp_addr *saddr = &t->saddr;
540 struct rtable *rt = (struct rtable *)t->dst;
543 saddr->v4.sin_family = AF_INET;
544 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
548 /* What interface did this skb arrive on? */
549 static int sctp_v4_skb_iif(const struct sk_buff *skb)
551 return inet_iif(skb);
554 /* Was this packet marked by Explicit Congestion Notification? */
555 static int sctp_v4_is_ce(const struct sk_buff *skb)
557 return INET_ECN_is_ce(ip_hdr(skb)->tos);
560 /* Create and initialize a new sk for the socket returned by accept(). */
561 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
562 struct sctp_association *asoc)
564 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
566 struct inet_sock *newinet;
571 sock_init_data(NULL, newsk);
573 sctp_copy_sock(newsk, sk, asoc);
574 sock_reset_flag(newsk, SOCK_ZAPPED);
576 newinet = inet_sk(newsk);
578 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
580 sk_refcnt_debug_inc(newsk);
582 if (newsk->sk_prot->init(newsk)) {
583 sk_common_release(newsk);
591 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
593 /* No address mapping for V4 sockets */
594 return sizeof(struct sockaddr_in);
597 /* Dump the v4 addr to the seq file. */
598 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
600 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
603 static void sctp_v4_ecn_capable(struct sock *sk)
608 static void sctp_addr_wq_timeout_handler(unsigned long arg)
610 struct net *net = (struct net *)arg;
611 struct sctp_sockaddr_entry *addrw, *temp;
612 struct sctp_sock *sp;
614 spin_lock_bh(&net->sctp.addr_wq_lock);
616 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
617 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
618 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
619 addrw->state, addrw);
621 #if IS_ENABLED(CONFIG_IPV6)
622 /* Now we send an ASCONF for each association */
623 /* Note. we currently don't handle link local IPv6 addressees */
624 if (addrw->a.sa.sa_family == AF_INET6) {
625 struct in6_addr *in6;
627 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
631 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
632 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
633 addrw->state == SCTP_ADDR_NEW) {
634 unsigned long timeo_val;
636 pr_debug("%s: this is on DAD, trying %d sec "
638 SCTP_ADDRESS_TICK_DELAY);
641 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
642 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
647 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
650 sk = sctp_opt2sk(sp);
651 /* ignore bound-specific endpoints */
652 if (!sctp_is_ep_boundall(sk))
655 if (sctp_asconf_mgmt(sp, addrw) < 0)
656 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
659 #if IS_ENABLED(CONFIG_IPV6)
662 list_del(&addrw->list);
665 spin_unlock_bh(&net->sctp.addr_wq_lock);
668 static void sctp_free_addr_wq(struct net *net)
670 struct sctp_sockaddr_entry *addrw;
671 struct sctp_sockaddr_entry *temp;
673 spin_lock_bh(&net->sctp.addr_wq_lock);
674 del_timer(&net->sctp.addr_wq_timer);
675 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
676 list_del(&addrw->list);
679 spin_unlock_bh(&net->sctp.addr_wq_lock);
682 /* lookup the entry for the same address in the addr_waitq
683 * sctp_addr_wq MUST be locked
685 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
686 struct sctp_sockaddr_entry *addr)
688 struct sctp_sockaddr_entry *addrw;
690 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
691 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
693 if (addrw->a.sa.sa_family == AF_INET) {
694 if (addrw->a.v4.sin_addr.s_addr ==
695 addr->a.v4.sin_addr.s_addr)
697 } else if (addrw->a.sa.sa_family == AF_INET6) {
698 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
699 &addr->a.v6.sin6_addr))
706 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
708 struct sctp_sockaddr_entry *addrw;
709 unsigned long timeo_val;
711 /* first, we check if an opposite message already exist in the queue.
712 * If we found such message, it is removed.
713 * This operation is a bit stupid, but the DHCP client attaches the
714 * new address after a couple of addition and deletion of that address
717 spin_lock_bh(&net->sctp.addr_wq_lock);
718 /* Offsets existing events in addr_wq */
719 addrw = sctp_addr_wq_lookup(net, addr);
721 if (addrw->state != cmd) {
722 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
723 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
724 &net->sctp.addr_waitq);
726 list_del(&addrw->list);
729 spin_unlock_bh(&net->sctp.addr_wq_lock);
733 /* OK, we have to add the new address to the wait queue */
734 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
736 spin_unlock_bh(&net->sctp.addr_wq_lock);
740 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
742 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
743 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
745 if (!timer_pending(&net->sctp.addr_wq_timer)) {
747 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
748 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
750 spin_unlock_bh(&net->sctp.addr_wq_lock);
753 /* Event handler for inet address addition/deletion events.
754 * The sctp_local_addr_list needs to be protocted by a spin lock since
755 * multiple notifiers (say IPv4 and IPv6) may be running at the same
756 * time and thus corrupt the list.
757 * The reader side is protected with RCU.
759 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
762 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
763 struct sctp_sockaddr_entry *addr = NULL;
764 struct sctp_sockaddr_entry *temp;
765 struct net *net = dev_net(ifa->ifa_dev->dev);
770 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
772 addr->a.v4.sin_family = AF_INET;
773 addr->a.v4.sin_port = 0;
774 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
776 spin_lock_bh(&net->sctp.local_addr_lock);
777 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
778 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
779 spin_unlock_bh(&net->sctp.local_addr_lock);
783 spin_lock_bh(&net->sctp.local_addr_lock);
784 list_for_each_entry_safe(addr, temp,
785 &net->sctp.local_addr_list, list) {
786 if (addr->a.sa.sa_family == AF_INET &&
787 addr->a.v4.sin_addr.s_addr ==
789 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
792 list_del_rcu(&addr->list);
796 spin_unlock_bh(&net->sctp.local_addr_lock);
798 kfree_rcu(addr, rcu);
806 * Initialize the control inode/socket with a control endpoint data
807 * structure. This endpoint is reserved exclusively for the OOTB processing.
809 static int sctp_ctl_sock_init(struct net *net)
812 sa_family_t family = PF_INET;
814 if (sctp_get_pf_specific(PF_INET6))
817 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
818 SOCK_SEQPACKET, IPPROTO_SCTP, net);
820 /* If IPv6 socket could not be created, try the IPv4 socket */
821 if (err < 0 && family == PF_INET6)
822 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
823 SOCK_SEQPACKET, IPPROTO_SCTP,
827 pr_err("Failed to create the SCTP control socket\n");
833 /* Register address family specific functions. */
834 int sctp_register_af(struct sctp_af *af)
836 switch (af->sa_family) {
838 if (sctp_af_v4_specific)
840 sctp_af_v4_specific = af;
843 if (sctp_af_v6_specific)
845 sctp_af_v6_specific = af;
851 INIT_LIST_HEAD(&af->list);
852 list_add_tail(&af->list, &sctp_address_families);
856 /* Get the table of functions for manipulating a particular address
859 struct sctp_af *sctp_get_af_specific(sa_family_t family)
863 return sctp_af_v4_specific;
865 return sctp_af_v6_specific;
871 /* Common code to initialize a AF_INET msg_name. */
872 static void sctp_inet_msgname(char *msgname, int *addr_len)
874 struct sockaddr_in *sin;
876 sin = (struct sockaddr_in *)msgname;
877 *addr_len = sizeof(struct sockaddr_in);
878 sin->sin_family = AF_INET;
879 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
882 /* Copy the primary address of the peer primary address as the msg_name. */
883 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
886 struct sockaddr_in *sin, *sinfrom;
889 struct sctp_association *asoc;
892 sctp_inet_msgname(msgname, addr_len);
893 sin = (struct sockaddr_in *)msgname;
894 sinfrom = &asoc->peer.primary_addr.v4;
895 sin->sin_port = htons(asoc->peer.port);
896 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
900 /* Initialize and copy out a msgname from an inbound skb. */
901 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
904 struct sctphdr *sh = sctp_hdr(skb);
905 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
907 sctp_inet_msgname(msgname, len);
908 sin->sin_port = sh->source;
909 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
913 /* Do we support this AF? */
914 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
916 /* PF_INET only supports AF_INET addresses. */
917 return AF_INET == family;
920 /* Address matching with wildcards allowed. */
921 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
922 const union sctp_addr *addr2,
923 struct sctp_sock *opt)
925 /* PF_INET only supports AF_INET addresses. */
926 if (addr1->sa.sa_family != addr2->sa.sa_family)
928 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
929 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
931 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
937 /* Verify that provided sockaddr looks bindable. Common verification has
938 * already been taken care of.
940 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
942 return sctp_v4_available(addr, opt);
945 /* Verify that sockaddr looks sendable. Common verification has already
946 * been taken care of.
948 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
953 /* Fill in Supported Address Type information for INIT and INIT-ACK
954 * chunks. Returns number of addresses supported.
956 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
959 types[0] = SCTP_PARAM_IPV4_ADDRESS;
963 /* Wrapper routine that calls the ip transmit routine. */
964 static inline int sctp_v4_xmit(struct sk_buff *skb,
965 struct sctp_transport *transport)
967 struct inet_sock *inet = inet_sk(skb->sk);
969 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
970 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
972 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
973 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
975 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
977 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
980 static struct sctp_af sctp_af_inet;
982 static struct sctp_pf sctp_pf_inet = {
983 .event_msgname = sctp_inet_event_msgname,
984 .skb_msgname = sctp_inet_skb_msgname,
985 .af_supported = sctp_inet_af_supported,
986 .cmp_addr = sctp_inet_cmp_addr,
987 .bind_verify = sctp_inet_bind_verify,
988 .send_verify = sctp_inet_send_verify,
989 .supported_addrs = sctp_inet_supported_addrs,
990 .create_accept_sk = sctp_v4_create_accept_sk,
991 .addr_to_user = sctp_v4_addr_to_user,
992 .to_sk_saddr = sctp_v4_to_sk_saddr,
993 .to_sk_daddr = sctp_v4_to_sk_daddr,
997 /* Notifier for inetaddr addition/deletion events. */
998 static struct notifier_block sctp_inetaddr_notifier = {
999 .notifier_call = sctp_inetaddr_event,
1002 /* Socket operations. */
1003 static const struct proto_ops inet_seqpacket_ops = {
1005 .owner = THIS_MODULE,
1006 .release = inet_release, /* Needs to be wrapped... */
1008 .connect = inet_dgram_connect,
1009 .socketpair = sock_no_socketpair,
1010 .accept = inet_accept,
1011 .getname = inet_getname, /* Semantics are different. */
1013 .ioctl = inet_ioctl,
1014 .listen = sctp_inet_listen,
1015 .shutdown = inet_shutdown, /* Looks harmless. */
1016 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1017 .getsockopt = sock_common_getsockopt,
1018 .sendmsg = inet_sendmsg,
1019 .recvmsg = sock_common_recvmsg,
1020 .mmap = sock_no_mmap,
1021 .sendpage = sock_no_sendpage,
1022 #ifdef CONFIG_COMPAT
1023 .compat_setsockopt = compat_sock_common_setsockopt,
1024 .compat_getsockopt = compat_sock_common_getsockopt,
1028 /* Registration with AF_INET family. */
1029 static struct inet_protosw sctp_seqpacket_protosw = {
1030 .type = SOCK_SEQPACKET,
1031 .protocol = IPPROTO_SCTP,
1033 .ops = &inet_seqpacket_ops,
1034 .flags = SCTP_PROTOSW_FLAG
1036 static struct inet_protosw sctp_stream_protosw = {
1037 .type = SOCK_STREAM,
1038 .protocol = IPPROTO_SCTP,
1040 .ops = &inet_seqpacket_ops,
1041 .flags = SCTP_PROTOSW_FLAG
1044 /* Register with IP layer. */
1045 static const struct net_protocol sctp_protocol = {
1046 .handler = sctp_rcv,
1047 .err_handler = sctp_v4_err,
1050 .icmp_strict_tag_validation = 1,
1053 /* IPv4 address related functions. */
1054 static struct sctp_af sctp_af_inet = {
1055 .sa_family = AF_INET,
1056 .sctp_xmit = sctp_v4_xmit,
1057 .setsockopt = ip_setsockopt,
1058 .getsockopt = ip_getsockopt,
1059 .get_dst = sctp_v4_get_dst,
1060 .get_saddr = sctp_v4_get_saddr,
1061 .copy_addrlist = sctp_v4_copy_addrlist,
1062 .from_skb = sctp_v4_from_skb,
1063 .from_sk = sctp_v4_from_sk,
1064 .from_addr_param = sctp_v4_from_addr_param,
1065 .to_addr_param = sctp_v4_to_addr_param,
1066 .cmp_addr = sctp_v4_cmp_addr,
1067 .addr_valid = sctp_v4_addr_valid,
1068 .inaddr_any = sctp_v4_inaddr_any,
1069 .is_any = sctp_v4_is_any,
1070 .available = sctp_v4_available,
1071 .scope = sctp_v4_scope,
1072 .skb_iif = sctp_v4_skb_iif,
1073 .is_ce = sctp_v4_is_ce,
1074 .seq_dump_addr = sctp_v4_seq_dump_addr,
1075 .ecn_capable = sctp_v4_ecn_capable,
1076 .net_header_len = sizeof(struct iphdr),
1077 .sockaddr_len = sizeof(struct sockaddr_in),
1078 #ifdef CONFIG_COMPAT
1079 .compat_setsockopt = compat_ip_setsockopt,
1080 .compat_getsockopt = compat_ip_getsockopt,
1084 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1088 return sctp_pf_inet_specific;
1090 return sctp_pf_inet6_specific;
1096 /* Register the PF specific function table. */
1097 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1101 if (sctp_pf_inet_specific)
1103 sctp_pf_inet_specific = pf;
1106 if (sctp_pf_inet6_specific)
1108 sctp_pf_inet6_specific = pf;
1116 static inline int init_sctp_mibs(struct net *net)
1118 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1119 if (!net->sctp.sctp_statistics)
1124 static inline void cleanup_sctp_mibs(struct net *net)
1126 free_percpu(net->sctp.sctp_statistics);
1129 static void sctp_v4_pf_init(void)
1131 /* Initialize the SCTP specific PF functions. */
1132 sctp_register_pf(&sctp_pf_inet, PF_INET);
1133 sctp_register_af(&sctp_af_inet);
1136 static void sctp_v4_pf_exit(void)
1138 list_del(&sctp_af_inet.list);
1141 static int sctp_v4_protosw_init(void)
1145 rc = proto_register(&sctp_prot, 1);
1149 /* Register SCTP(UDP and TCP style) with socket layer. */
1150 inet_register_protosw(&sctp_seqpacket_protosw);
1151 inet_register_protosw(&sctp_stream_protosw);
1156 static void sctp_v4_protosw_exit(void)
1158 inet_unregister_protosw(&sctp_stream_protosw);
1159 inet_unregister_protosw(&sctp_seqpacket_protosw);
1160 proto_unregister(&sctp_prot);
1163 static int sctp_v4_add_protocol(void)
1165 /* Register notifier for inet address additions/deletions. */
1166 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1168 /* Register SCTP with inet layer. */
1169 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1175 static void sctp_v4_del_protocol(void)
1177 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1178 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1181 static int __net_init sctp_net_init(struct net *net)
1186 * 14. Suggested SCTP Protocol Parameter Values
1188 /* The following protocol parameters are RECOMMENDED: */
1189 /* RTO.Initial - 3 seconds */
1190 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1191 /* RTO.Min - 1 second */
1192 net->sctp.rto_min = SCTP_RTO_MIN;
1193 /* RTO.Max - 60 seconds */
1194 net->sctp.rto_max = SCTP_RTO_MAX;
1195 /* RTO.Alpha - 1/8 */
1196 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1197 /* RTO.Beta - 1/4 */
1198 net->sctp.rto_beta = SCTP_RTO_BETA;
1200 /* Valid.Cookie.Life - 60 seconds */
1201 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1203 /* Whether Cookie Preservative is enabled(1) or not(0) */
1204 net->sctp.cookie_preserve_enable = 1;
1206 /* Default sctp sockets to use md5 as their hmac alg */
1207 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1208 net->sctp.sctp_hmac_alg = "md5";
1209 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1210 net->sctp.sctp_hmac_alg = "sha1";
1212 net->sctp.sctp_hmac_alg = NULL;
1216 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1218 /* Association.Max.Retrans - 10 attempts
1219 * Path.Max.Retrans - 5 attempts (per destination address)
1220 * Max.Init.Retransmits - 8 attempts
1222 net->sctp.max_retrans_association = 10;
1223 net->sctp.max_retrans_path = 5;
1224 net->sctp.max_retrans_init = 8;
1226 /* Sendbuffer growth - do per-socket accounting */
1227 net->sctp.sndbuf_policy = 0;
1229 /* Rcvbuffer growth - do per-socket accounting */
1230 net->sctp.rcvbuf_policy = 0;
1232 /* HB.interval - 30 seconds */
1233 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1235 /* delayed SACK timeout */
1236 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1238 /* Disable ADDIP by default. */
1239 net->sctp.addip_enable = 0;
1240 net->sctp.addip_noauth = 0;
1241 net->sctp.default_auto_asconf = 0;
1243 /* Enable PR-SCTP by default. */
1244 net->sctp.prsctp_enable = 1;
1246 /* Disable AUTH by default. */
1247 net->sctp.auth_enable = 0;
1249 /* Set SCOPE policy to enabled */
1250 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1252 /* Set the default rwnd update threshold */
1253 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1255 /* Initialize maximum autoclose timeout. */
1256 net->sctp.max_autoclose = INT_MAX / HZ;
1258 status = sctp_sysctl_net_register(net);
1260 goto err_sysctl_register;
1262 /* Allocate and initialise sctp mibs. */
1263 status = init_sctp_mibs(net);
1267 /* Initialize proc fs directory. */
1268 status = sctp_proc_init(net);
1272 sctp_dbg_objcnt_init(net);
1274 /* Initialize the control inode/socket for handling OOTB packets. */
1275 if ((status = sctp_ctl_sock_init(net))) {
1276 pr_err("Failed to initialize the SCTP control sock\n");
1277 goto err_ctl_sock_init;
1280 /* Initialize the local address list. */
1281 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1282 spin_lock_init(&net->sctp.local_addr_lock);
1283 sctp_get_local_addr_list(net);
1285 /* Initialize the address event list */
1286 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1287 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1288 spin_lock_init(&net->sctp.addr_wq_lock);
1289 net->sctp.addr_wq_timer.expires = 0;
1290 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1291 (unsigned long)net);
1296 sctp_dbg_objcnt_exit(net);
1297 sctp_proc_exit(net);
1299 cleanup_sctp_mibs(net);
1301 sctp_sysctl_net_unregister(net);
1302 err_sysctl_register:
1306 static void __net_exit sctp_net_exit(struct net *net)
1308 /* Free the local address list */
1309 sctp_free_addr_wq(net);
1310 sctp_free_local_addr_list(net);
1312 /* Free the control endpoint. */
1313 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1315 sctp_dbg_objcnt_exit(net);
1317 sctp_proc_exit(net);
1318 cleanup_sctp_mibs(net);
1319 sctp_sysctl_net_unregister(net);
1322 static struct pernet_operations sctp_net_ops = {
1323 .init = sctp_net_init,
1324 .exit = sctp_net_exit,
1327 /* Initialize the universe into something sensible. */
1328 static __init int sctp_init(void)
1331 int status = -EINVAL;
1333 unsigned long limit;
1337 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1339 /* Allocate bind_bucket and chunk caches. */
1341 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1342 sizeof(struct sctp_bind_bucket),
1343 0, SLAB_HWCACHE_ALIGN,
1345 if (!sctp_bucket_cachep)
1348 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1349 sizeof(struct sctp_chunk),
1350 0, SLAB_HWCACHE_ALIGN,
1352 if (!sctp_chunk_cachep)
1353 goto err_chunk_cachep;
1355 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1357 goto err_percpu_counter_init;
1359 /* Implementation specific variables. */
1361 /* Initialize default stream count setup information. */
1362 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1363 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1365 /* Initialize handle used for association ids. */
1366 idr_init(&sctp_assocs_id);
1368 limit = nr_free_buffer_pages() / 8;
1369 limit = max(limit, 128UL);
1370 sysctl_sctp_mem[0] = limit / 4 * 3;
1371 sysctl_sctp_mem[1] = limit;
1372 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1374 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1375 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1376 max_share = min(4UL*1024*1024, limit);
1378 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1379 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1380 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1382 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1383 sysctl_sctp_wmem[1] = 16*1024;
1384 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1386 /* Size and allocate the association hash table.
1387 * The methodology is similar to that of the tcp hash tables.
1389 if (totalram_pages >= (128 * 1024))
1390 goal = totalram_pages >> (22 - PAGE_SHIFT);
1392 goal = totalram_pages >> (24 - PAGE_SHIFT);
1394 for (order = 0; (1UL << order) < goal; order++)
1398 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1399 sizeof(struct sctp_hashbucket);
1400 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1402 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1403 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1404 } while (!sctp_assoc_hashtable && --order > 0);
1405 if (!sctp_assoc_hashtable) {
1406 pr_err("Failed association hash alloc\n");
1408 goto err_ahash_alloc;
1410 for (i = 0; i < sctp_assoc_hashsize; i++) {
1411 rwlock_init(&sctp_assoc_hashtable[i].lock);
1412 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1415 /* Allocate and initialize the endpoint hash table. */
1416 sctp_ep_hashsize = 64;
1418 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1419 if (!sctp_ep_hashtable) {
1420 pr_err("Failed endpoint_hash alloc\n");
1422 goto err_ehash_alloc;
1424 for (i = 0; i < sctp_ep_hashsize; i++) {
1425 rwlock_init(&sctp_ep_hashtable[i].lock);
1426 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1429 /* Allocate and initialize the SCTP port hash table. */
1431 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1432 sizeof(struct sctp_bind_hashbucket);
1433 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1435 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1436 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1437 } while (!sctp_port_hashtable && --order > 0);
1438 if (!sctp_port_hashtable) {
1439 pr_err("Failed bind hash alloc\n");
1441 goto err_bhash_alloc;
1443 for (i = 0; i < sctp_port_hashsize; i++) {
1444 spin_lock_init(&sctp_port_hashtable[i].lock);
1445 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1448 pr_info("Hash tables configured (established %d bind %d)\n",
1449 sctp_assoc_hashsize, sctp_port_hashsize);
1451 sctp_sysctl_register();
1453 INIT_LIST_HEAD(&sctp_address_families);
1457 status = sctp_v4_protosw_init();
1460 goto err_protosw_init;
1462 status = sctp_v6_protosw_init();
1464 goto err_v6_protosw_init;
1466 status = register_pernet_subsys(&sctp_net_ops);
1468 goto err_register_pernet_subsys;
1470 status = sctp_v4_add_protocol();
1472 goto err_add_protocol;
1474 /* Register SCTP with inet6 layer. */
1475 status = sctp_v6_add_protocol();
1477 goto err_v6_add_protocol;
1481 err_v6_add_protocol:
1482 sctp_v4_del_protocol();
1484 unregister_pernet_subsys(&sctp_net_ops);
1485 err_register_pernet_subsys:
1486 sctp_v6_protosw_exit();
1487 err_v6_protosw_init:
1488 sctp_v4_protosw_exit();
1492 sctp_sysctl_unregister();
1493 free_pages((unsigned long)sctp_port_hashtable,
1494 get_order(sctp_port_hashsize *
1495 sizeof(struct sctp_bind_hashbucket)));
1497 kfree(sctp_ep_hashtable);
1499 free_pages((unsigned long)sctp_assoc_hashtable,
1500 get_order(sctp_assoc_hashsize *
1501 sizeof(struct sctp_hashbucket)));
1503 percpu_counter_destroy(&sctp_sockets_allocated);
1504 err_percpu_counter_init:
1505 kmem_cache_destroy(sctp_chunk_cachep);
1507 kmem_cache_destroy(sctp_bucket_cachep);
1511 /* Exit handler for the SCTP protocol. */
1512 static __exit void sctp_exit(void)
1514 /* BUG. This should probably do something useful like clean
1515 * up all the remaining associations and all that memory.
1518 /* Unregister with inet6/inet layers. */
1519 sctp_v6_del_protocol();
1520 sctp_v4_del_protocol();
1522 unregister_pernet_subsys(&sctp_net_ops);
1524 /* Free protosw registrations */
1525 sctp_v6_protosw_exit();
1526 sctp_v4_protosw_exit();
1528 /* Unregister with socket layer. */
1532 sctp_sysctl_unregister();
1534 free_pages((unsigned long)sctp_assoc_hashtable,
1535 get_order(sctp_assoc_hashsize *
1536 sizeof(struct sctp_hashbucket)));
1537 kfree(sctp_ep_hashtable);
1538 free_pages((unsigned long)sctp_port_hashtable,
1539 get_order(sctp_port_hashsize *
1540 sizeof(struct sctp_bind_hashbucket)));
1542 percpu_counter_destroy(&sctp_sockets_allocated);
1544 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1546 kmem_cache_destroy(sctp_chunk_cachep);
1547 kmem_cache_destroy(sctp_bucket_cachep);
1550 module_init(sctp_init);
1551 module_exit(sctp_exit);
1554 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1556 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1557 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1558 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1559 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1560 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1561 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1562 MODULE_LICENSE("GPL");