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 /* Private helper to extract ipv4 address and stash them in
84 * the protocol structure.
86 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
87 struct net_device *dev)
89 struct in_device *in_dev;
90 struct in_ifaddr *ifa;
91 struct sctp_sockaddr_entry *addr;
94 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
99 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
100 /* Add the address to the local list. */
101 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
103 addr->a.v4.sin_family = AF_INET;
104 addr->a.v4.sin_port = 0;
105 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
107 INIT_LIST_HEAD(&addr->list);
108 list_add_tail(&addr->list, addrlist);
115 /* Extract our IP addresses from the system and stash them in the
116 * protocol structure.
118 static void sctp_get_local_addr_list(struct net *net)
120 struct net_device *dev;
121 struct list_head *pos;
125 for_each_netdev_rcu(net, dev) {
126 list_for_each(pos, &sctp_address_families) {
127 af = list_entry(pos, struct sctp_af, list);
128 af->copy_addrlist(&net->sctp.local_addr_list, dev);
134 /* Free the existing local addresses. */
135 static void sctp_free_local_addr_list(struct net *net)
137 struct sctp_sockaddr_entry *addr;
138 struct list_head *pos, *temp;
140 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
141 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
147 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
148 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
149 enum sctp_scope scope, gfp_t gfp, int copy_flags)
151 struct sctp_sockaddr_entry *addr;
152 union sctp_addr laddr;
156 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
159 if (!sctp_in_scope(net, &addr->a, scope))
162 /* Now that the address is in scope, check to see if
163 * the address type is really supported by the local
164 * sock as well as the remote peer.
166 if (addr->a.sa.sa_family == AF_INET &&
167 !(copy_flags & SCTP_ADDR4_PEERSUPP))
169 if (addr->a.sa.sa_family == AF_INET6 &&
170 (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
171 !(copy_flags & SCTP_ADDR6_PEERSUPP)))
175 /* also works for setting ipv6 address port */
176 laddr.v4.sin_port = htons(bp->port);
177 if (sctp_bind_addr_state(bp, &laddr) != -1)
180 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
181 SCTP_ADDR_SRC, GFP_ATOMIC);
190 /* Initialize a sctp_addr from in incoming skb. */
191 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
194 /* Always called on head skb, so this is safe */
195 struct sctphdr *sh = sctp_hdr(skb);
196 struct sockaddr_in *sa = &addr->v4;
198 addr->v4.sin_family = AF_INET;
201 sa->sin_port = sh->source;
202 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
204 sa->sin_port = sh->dest;
205 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
209 /* Initialize an sctp_addr from a socket. */
210 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
212 addr->v4.sin_family = AF_INET;
213 addr->v4.sin_port = 0;
214 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
217 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
218 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
220 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
223 /* Initialize sk->sk_daddr from sctp_addr. */
224 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
226 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
229 /* Initialize a sctp_addr from an address parameter. */
230 static void sctp_v4_from_addr_param(union sctp_addr *addr,
231 union sctp_addr_param *param,
232 __be16 port, int iif)
234 addr->v4.sin_family = AF_INET;
235 addr->v4.sin_port = port;
236 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
239 /* Initialize an address parameter from a sctp_addr and return the length
240 * of the address parameter.
242 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
243 union sctp_addr_param *param)
245 int length = sizeof(struct sctp_ipv4addr_param);
247 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
248 param->v4.param_hdr.length = htons(length);
249 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
254 /* Initialize a sctp_addr from a dst_entry. */
255 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
258 saddr->v4.sin_family = AF_INET;
259 saddr->v4.sin_port = port;
260 saddr->v4.sin_addr.s_addr = fl4->saddr;
263 /* Compare two addresses exactly. */
264 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
265 const union sctp_addr *addr2)
267 if (addr1->sa.sa_family != addr2->sa.sa_family)
269 if (addr1->v4.sin_port != addr2->v4.sin_port)
271 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
277 /* Initialize addr struct to INADDR_ANY. */
278 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
280 addr->v4.sin_family = AF_INET;
281 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
282 addr->v4.sin_port = port;
285 /* Is this a wildcard address? */
286 static int sctp_v4_is_any(const union sctp_addr *addr)
288 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
291 /* This function checks if the address is a valid address to be used for
295 * Return 0 - If the address is a non-unicast or an illegal address.
296 * Return 1 - If the address is a unicast.
298 static int sctp_v4_addr_valid(union sctp_addr *addr,
299 struct sctp_sock *sp,
300 const struct sk_buff *skb)
302 /* IPv4 addresses not allowed */
303 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
306 /* Is this a non-unicast address or a unusable SCTP address? */
307 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
310 /* Is this a broadcast address? */
311 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
317 /* Should this be available for binding? */
318 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
320 struct net *net = sock_net(&sp->inet.sk);
321 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
324 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
326 !sp->inet.freebind &&
327 !net->ipv4.sysctl_ip_nonlocal_bind)
330 if (ipv6_only_sock(sctp_opt2sk(sp)))
336 /* Checking the loopback, private and other address scopes as defined in
337 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
338 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
340 * Level 0 - unusable SCTP addresses
341 * Level 1 - loopback address
342 * Level 2 - link-local addresses
343 * Level 3 - private addresses.
344 * Level 4 - global addresses
345 * For INIT and INIT-ACK address list, let L be the level of
346 * of requested destination address, sender and receiver
347 * SHOULD include all of its addresses with level greater
348 * than or equal to L.
350 * IPv4 scoping can be controlled through sysctl option
351 * net.sctp.addr_scope_policy
353 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
355 enum sctp_scope retval;
357 /* Check for unusable SCTP addresses. */
358 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
359 retval = SCTP_SCOPE_UNUSABLE;
360 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
361 retval = SCTP_SCOPE_LOOPBACK;
362 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
363 retval = SCTP_SCOPE_LINK;
364 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
365 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
366 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
367 retval = SCTP_SCOPE_PRIVATE;
369 retval = SCTP_SCOPE_GLOBAL;
375 /* Returns a valid dst cache entry for the given source and destination ip
376 * addresses. If an association is passed, trys to get a dst entry with a
377 * source address that matches an address in the bind address list.
379 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
380 struct flowi *fl, struct sock *sk)
382 struct sctp_association *asoc = t->asoc;
384 struct flowi4 *fl4 = &fl->u.ip4;
385 struct sctp_bind_addr *bp;
386 struct sctp_sockaddr_entry *laddr;
387 struct dst_entry *dst = NULL;
388 union sctp_addr *daddr = &t->ipaddr;
389 union sctp_addr dst_saddr;
391 memset(fl4, 0x0, sizeof(struct flowi4));
392 fl4->daddr = daddr->v4.sin_addr.s_addr;
393 fl4->fl4_dport = daddr->v4.sin_port;
394 fl4->flowi4_proto = IPPROTO_SCTP;
396 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
397 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
398 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
401 fl4->saddr = saddr->v4.sin_addr.s_addr;
402 fl4->fl4_sport = saddr->v4.sin_port;
405 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
408 rt = ip_route_output_key(sock_net(sk), fl4);
412 /* If there is no association or if a source address is passed, no
413 * more validation is required.
418 bp = &asoc->base.bind_addr;
421 /* Walk through the bind address list and look for a bind
422 * address that matches the source address of the returned dst.
424 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
426 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
427 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
428 (laddr->state != SCTP_ADDR_SRC &&
429 !asoc->src_out_of_asoc_ok))
431 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
436 /* None of the bound addresses match the source address of the
437 * dst. So release it.
443 /* Walk through the bind address list and try to get a dst that
444 * matches a bind address as the source address.
447 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
448 struct net_device *odev;
452 if (laddr->state != SCTP_ADDR_SRC ||
453 AF_INET != laddr->a.sa.sa_family)
456 fl4->fl4_sport = laddr->a.v4.sin_port;
457 flowi4_update_output(fl4,
458 asoc->base.sk->sk_bound_dev_if,
459 RT_CONN_FLAGS(asoc->base.sk),
460 daddr->v4.sin_addr.s_addr,
461 laddr->a.v4.sin_addr.s_addr);
463 rt = ip_route_output_key(sock_net(sk), fl4);
467 /* Ensure the src address belongs to the output
470 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
472 if (!odev || odev->ifindex != fl4->flowi4_oif) {
476 dst_release(&rt->dst);
490 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
491 &fl4->daddr, &fl4->saddr);
493 pr_debug("no route\n");
496 /* For v4, the source address is cached in the route entry(dst). So no need
497 * to cache it separately and hence this is an empty routine.
499 static void sctp_v4_get_saddr(struct sctp_sock *sk,
500 struct sctp_transport *t,
503 union sctp_addr *saddr = &t->saddr;
504 struct rtable *rt = (struct rtable *)t->dst;
507 saddr->v4.sin_family = AF_INET;
508 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
512 /* What interface did this skb arrive on? */
513 static int sctp_v4_skb_iif(const struct sk_buff *skb)
515 return inet_iif(skb);
518 /* Was this packet marked by Explicit Congestion Notification? */
519 static int sctp_v4_is_ce(const struct sk_buff *skb)
521 return INET_ECN_is_ce(ip_hdr(skb)->tos);
524 /* Create and initialize a new sk for the socket returned by accept(). */
525 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
526 struct sctp_association *asoc,
529 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
531 struct inet_sock *newinet;
536 sock_init_data(NULL, newsk);
538 sctp_copy_sock(newsk, sk, asoc);
539 sock_reset_flag(newsk, SOCK_ZAPPED);
541 newinet = inet_sk(newsk);
543 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
545 sk_refcnt_debug_inc(newsk);
547 if (newsk->sk_prot->init(newsk)) {
548 sk_common_release(newsk);
556 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
558 /* No address mapping for V4 sockets */
559 return sizeof(struct sockaddr_in);
562 /* Dump the v4 addr to the seq file. */
563 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
565 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
568 static void sctp_v4_ecn_capable(struct sock *sk)
573 static void sctp_addr_wq_timeout_handler(struct timer_list *t)
575 struct net *net = from_timer(net, t, sctp.addr_wq_timer);
576 struct sctp_sockaddr_entry *addrw, *temp;
577 struct sctp_sock *sp;
579 spin_lock_bh(&net->sctp.addr_wq_lock);
581 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
582 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
583 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
584 addrw->state, addrw);
586 #if IS_ENABLED(CONFIG_IPV6)
587 /* Now we send an ASCONF for each association */
588 /* Note. we currently don't handle link local IPv6 addressees */
589 if (addrw->a.sa.sa_family == AF_INET6) {
590 struct in6_addr *in6;
592 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
596 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
597 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
598 addrw->state == SCTP_ADDR_NEW) {
599 unsigned long timeo_val;
601 pr_debug("%s: this is on DAD, trying %d sec "
603 SCTP_ADDRESS_TICK_DELAY);
606 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
607 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
612 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
615 sk = sctp_opt2sk(sp);
616 /* ignore bound-specific endpoints */
617 if (!sctp_is_ep_boundall(sk))
620 if (sctp_asconf_mgmt(sp, addrw) < 0)
621 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
624 #if IS_ENABLED(CONFIG_IPV6)
627 list_del(&addrw->list);
630 spin_unlock_bh(&net->sctp.addr_wq_lock);
633 static void sctp_free_addr_wq(struct net *net)
635 struct sctp_sockaddr_entry *addrw;
636 struct sctp_sockaddr_entry *temp;
638 spin_lock_bh(&net->sctp.addr_wq_lock);
639 del_timer(&net->sctp.addr_wq_timer);
640 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
641 list_del(&addrw->list);
644 spin_unlock_bh(&net->sctp.addr_wq_lock);
647 /* lookup the entry for the same address in the addr_waitq
648 * sctp_addr_wq MUST be locked
650 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
651 struct sctp_sockaddr_entry *addr)
653 struct sctp_sockaddr_entry *addrw;
655 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
656 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
658 if (addrw->a.sa.sa_family == AF_INET) {
659 if (addrw->a.v4.sin_addr.s_addr ==
660 addr->a.v4.sin_addr.s_addr)
662 } else if (addrw->a.sa.sa_family == AF_INET6) {
663 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
664 &addr->a.v6.sin6_addr))
671 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
673 struct sctp_sockaddr_entry *addrw;
674 unsigned long timeo_val;
676 /* first, we check if an opposite message already exist in the queue.
677 * If we found such message, it is removed.
678 * This operation is a bit stupid, but the DHCP client attaches the
679 * new address after a couple of addition and deletion of that address
682 spin_lock_bh(&net->sctp.addr_wq_lock);
683 /* Offsets existing events in addr_wq */
684 addrw = sctp_addr_wq_lookup(net, addr);
686 if (addrw->state != cmd) {
687 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
688 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
689 &net->sctp.addr_waitq);
691 list_del(&addrw->list);
694 spin_unlock_bh(&net->sctp.addr_wq_lock);
698 /* OK, we have to add the new address to the wait queue */
699 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
701 spin_unlock_bh(&net->sctp.addr_wq_lock);
705 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
707 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
708 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
710 if (!timer_pending(&net->sctp.addr_wq_timer)) {
712 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
713 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
715 spin_unlock_bh(&net->sctp.addr_wq_lock);
718 /* Event handler for inet address addition/deletion events.
719 * The sctp_local_addr_list needs to be protocted by a spin lock since
720 * multiple notifiers (say IPv4 and IPv6) may be running at the same
721 * time and thus corrupt the list.
722 * The reader side is protected with RCU.
724 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
727 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
728 struct sctp_sockaddr_entry *addr = NULL;
729 struct sctp_sockaddr_entry *temp;
730 struct net *net = dev_net(ifa->ifa_dev->dev);
735 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
737 addr->a.v4.sin_family = AF_INET;
738 addr->a.v4.sin_port = 0;
739 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
741 spin_lock_bh(&net->sctp.local_addr_lock);
742 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
743 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
744 spin_unlock_bh(&net->sctp.local_addr_lock);
748 spin_lock_bh(&net->sctp.local_addr_lock);
749 list_for_each_entry_safe(addr, temp,
750 &net->sctp.local_addr_list, list) {
751 if (addr->a.sa.sa_family == AF_INET &&
752 addr->a.v4.sin_addr.s_addr ==
754 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
757 list_del_rcu(&addr->list);
761 spin_unlock_bh(&net->sctp.local_addr_lock);
763 kfree_rcu(addr, rcu);
771 * Initialize the control inode/socket with a control endpoint data
772 * structure. This endpoint is reserved exclusively for the OOTB processing.
774 static int sctp_ctl_sock_init(struct net *net)
777 sa_family_t family = PF_INET;
779 if (sctp_get_pf_specific(PF_INET6))
782 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
783 SOCK_SEQPACKET, IPPROTO_SCTP, net);
785 /* If IPv6 socket could not be created, try the IPv4 socket */
786 if (err < 0 && family == PF_INET6)
787 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
788 SOCK_SEQPACKET, IPPROTO_SCTP,
792 pr_err("Failed to create the SCTP control socket\n");
798 /* Register address family specific functions. */
799 int sctp_register_af(struct sctp_af *af)
801 switch (af->sa_family) {
803 if (sctp_af_v4_specific)
805 sctp_af_v4_specific = af;
808 if (sctp_af_v6_specific)
810 sctp_af_v6_specific = af;
816 INIT_LIST_HEAD(&af->list);
817 list_add_tail(&af->list, &sctp_address_families);
821 /* Get the table of functions for manipulating a particular address
824 struct sctp_af *sctp_get_af_specific(sa_family_t family)
828 return sctp_af_v4_specific;
830 return sctp_af_v6_specific;
836 /* Common code to initialize a AF_INET msg_name. */
837 static void sctp_inet_msgname(char *msgname, int *addr_len)
839 struct sockaddr_in *sin;
841 sin = (struct sockaddr_in *)msgname;
842 *addr_len = sizeof(struct sockaddr_in);
843 sin->sin_family = AF_INET;
844 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
847 /* Copy the primary address of the peer primary address as the msg_name. */
848 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
851 struct sockaddr_in *sin, *sinfrom;
854 struct sctp_association *asoc;
857 sctp_inet_msgname(msgname, addr_len);
858 sin = (struct sockaddr_in *)msgname;
859 sinfrom = &asoc->peer.primary_addr.v4;
860 sin->sin_port = htons(asoc->peer.port);
861 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
865 /* Initialize and copy out a msgname from an inbound skb. */
866 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
869 struct sctphdr *sh = sctp_hdr(skb);
870 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
872 sctp_inet_msgname(msgname, len);
873 sin->sin_port = sh->source;
874 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
878 /* Do we support this AF? */
879 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
881 /* PF_INET only supports AF_INET addresses. */
882 return AF_INET == family;
885 /* Address matching with wildcards allowed. */
886 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
887 const union sctp_addr *addr2,
888 struct sctp_sock *opt)
890 /* PF_INET only supports AF_INET addresses. */
891 if (addr1->sa.sa_family != addr2->sa.sa_family)
893 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
894 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
896 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
902 /* Verify that provided sockaddr looks bindable. Common verification has
903 * already been taken care of.
905 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
907 return sctp_v4_available(addr, opt);
910 /* Verify that sockaddr looks sendable. Common verification has already
911 * been taken care of.
913 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
918 /* Fill in Supported Address Type information for INIT and INIT-ACK
919 * chunks. Returns number of addresses supported.
921 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
924 types[0] = SCTP_PARAM_IPV4_ADDRESS;
928 /* Wrapper routine that calls the ip transmit routine. */
929 static inline int sctp_v4_xmit(struct sk_buff *skb,
930 struct sctp_transport *transport)
932 struct inet_sock *inet = inet_sk(skb->sk);
934 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
935 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
937 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
938 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
940 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
942 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
945 static struct sctp_af sctp_af_inet;
947 static struct sctp_pf sctp_pf_inet = {
948 .event_msgname = sctp_inet_event_msgname,
949 .skb_msgname = sctp_inet_skb_msgname,
950 .af_supported = sctp_inet_af_supported,
951 .cmp_addr = sctp_inet_cmp_addr,
952 .bind_verify = sctp_inet_bind_verify,
953 .send_verify = sctp_inet_send_verify,
954 .supported_addrs = sctp_inet_supported_addrs,
955 .create_accept_sk = sctp_v4_create_accept_sk,
956 .addr_to_user = sctp_v4_addr_to_user,
957 .to_sk_saddr = sctp_v4_to_sk_saddr,
958 .to_sk_daddr = sctp_v4_to_sk_daddr,
962 /* Notifier for inetaddr addition/deletion events. */
963 static struct notifier_block sctp_inetaddr_notifier = {
964 .notifier_call = sctp_inetaddr_event,
967 /* Socket operations. */
968 static const struct proto_ops inet_seqpacket_ops = {
970 .owner = THIS_MODULE,
971 .release = inet_release, /* Needs to be wrapped... */
973 .connect = inet_dgram_connect,
974 .socketpair = sock_no_socketpair,
975 .accept = inet_accept,
976 .getname = inet_getname, /* Semantics are different. */
979 .listen = sctp_inet_listen,
980 .shutdown = inet_shutdown, /* Looks harmless. */
981 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
982 .getsockopt = sock_common_getsockopt,
983 .sendmsg = inet_sendmsg,
984 .recvmsg = inet_recvmsg,
985 .mmap = sock_no_mmap,
986 .sendpage = sock_no_sendpage,
988 .compat_setsockopt = compat_sock_common_setsockopt,
989 .compat_getsockopt = compat_sock_common_getsockopt,
993 /* Registration with AF_INET family. */
994 static struct inet_protosw sctp_seqpacket_protosw = {
995 .type = SOCK_SEQPACKET,
996 .protocol = IPPROTO_SCTP,
998 .ops = &inet_seqpacket_ops,
999 .flags = SCTP_PROTOSW_FLAG
1001 static struct inet_protosw sctp_stream_protosw = {
1002 .type = SOCK_STREAM,
1003 .protocol = IPPROTO_SCTP,
1005 .ops = &inet_seqpacket_ops,
1006 .flags = SCTP_PROTOSW_FLAG
1009 /* Register with IP layer. */
1010 static const struct net_protocol sctp_protocol = {
1011 .handler = sctp_rcv,
1012 .err_handler = sctp_v4_err,
1015 .icmp_strict_tag_validation = 1,
1018 /* IPv4 address related functions. */
1019 static struct sctp_af sctp_af_inet = {
1020 .sa_family = AF_INET,
1021 .sctp_xmit = sctp_v4_xmit,
1022 .setsockopt = ip_setsockopt,
1023 .getsockopt = ip_getsockopt,
1024 .get_dst = sctp_v4_get_dst,
1025 .get_saddr = sctp_v4_get_saddr,
1026 .copy_addrlist = sctp_v4_copy_addrlist,
1027 .from_skb = sctp_v4_from_skb,
1028 .from_sk = sctp_v4_from_sk,
1029 .from_addr_param = sctp_v4_from_addr_param,
1030 .to_addr_param = sctp_v4_to_addr_param,
1031 .cmp_addr = sctp_v4_cmp_addr,
1032 .addr_valid = sctp_v4_addr_valid,
1033 .inaddr_any = sctp_v4_inaddr_any,
1034 .is_any = sctp_v4_is_any,
1035 .available = sctp_v4_available,
1036 .scope = sctp_v4_scope,
1037 .skb_iif = sctp_v4_skb_iif,
1038 .is_ce = sctp_v4_is_ce,
1039 .seq_dump_addr = sctp_v4_seq_dump_addr,
1040 .ecn_capable = sctp_v4_ecn_capable,
1041 .net_header_len = sizeof(struct iphdr),
1042 .sockaddr_len = sizeof(struct sockaddr_in),
1043 #ifdef CONFIG_COMPAT
1044 .compat_setsockopt = compat_ip_setsockopt,
1045 .compat_getsockopt = compat_ip_getsockopt,
1049 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1053 return sctp_pf_inet_specific;
1055 return sctp_pf_inet6_specific;
1061 /* Register the PF specific function table. */
1062 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1066 if (sctp_pf_inet_specific)
1068 sctp_pf_inet_specific = pf;
1071 if (sctp_pf_inet6_specific)
1073 sctp_pf_inet6_specific = pf;
1081 static inline int init_sctp_mibs(struct net *net)
1083 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1084 if (!net->sctp.sctp_statistics)
1089 static inline void cleanup_sctp_mibs(struct net *net)
1091 free_percpu(net->sctp.sctp_statistics);
1094 static void sctp_v4_pf_init(void)
1096 /* Initialize the SCTP specific PF functions. */
1097 sctp_register_pf(&sctp_pf_inet, PF_INET);
1098 sctp_register_af(&sctp_af_inet);
1101 static void sctp_v4_pf_exit(void)
1103 list_del(&sctp_af_inet.list);
1106 static int sctp_v4_protosw_init(void)
1110 rc = proto_register(&sctp_prot, 1);
1114 /* Register SCTP(UDP and TCP style) with socket layer. */
1115 inet_register_protosw(&sctp_seqpacket_protosw);
1116 inet_register_protosw(&sctp_stream_protosw);
1121 static void sctp_v4_protosw_exit(void)
1123 inet_unregister_protosw(&sctp_stream_protosw);
1124 inet_unregister_protosw(&sctp_seqpacket_protosw);
1125 proto_unregister(&sctp_prot);
1128 static int sctp_v4_add_protocol(void)
1130 /* Register notifier for inet address additions/deletions. */
1131 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1133 /* Register SCTP with inet layer. */
1134 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1140 static void sctp_v4_del_protocol(void)
1142 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1143 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1146 static int __net_init sctp_defaults_init(struct net *net)
1151 * 14. Suggested SCTP Protocol Parameter Values
1153 /* The following protocol parameters are RECOMMENDED: */
1154 /* RTO.Initial - 3 seconds */
1155 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1156 /* RTO.Min - 1 second */
1157 net->sctp.rto_min = SCTP_RTO_MIN;
1158 /* RTO.Max - 60 seconds */
1159 net->sctp.rto_max = SCTP_RTO_MAX;
1160 /* RTO.Alpha - 1/8 */
1161 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1162 /* RTO.Beta - 1/4 */
1163 net->sctp.rto_beta = SCTP_RTO_BETA;
1165 /* Valid.Cookie.Life - 60 seconds */
1166 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1168 /* Whether Cookie Preservative is enabled(1) or not(0) */
1169 net->sctp.cookie_preserve_enable = 1;
1171 /* Default sctp sockets to use md5 as their hmac alg */
1172 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1173 net->sctp.sctp_hmac_alg = "md5";
1174 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1175 net->sctp.sctp_hmac_alg = "sha1";
1177 net->sctp.sctp_hmac_alg = NULL;
1181 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1183 /* Enable pf state by default */
1184 net->sctp.pf_enable = 1;
1186 /* Association.Max.Retrans - 10 attempts
1187 * Path.Max.Retrans - 5 attempts (per destination address)
1188 * Max.Init.Retransmits - 8 attempts
1190 net->sctp.max_retrans_association = 10;
1191 net->sctp.max_retrans_path = 5;
1192 net->sctp.max_retrans_init = 8;
1194 /* Sendbuffer growth - do per-socket accounting */
1195 net->sctp.sndbuf_policy = 0;
1197 /* Rcvbuffer growth - do per-socket accounting */
1198 net->sctp.rcvbuf_policy = 0;
1200 /* HB.interval - 30 seconds */
1201 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1203 /* delayed SACK timeout */
1204 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1206 /* Disable ADDIP by default. */
1207 net->sctp.addip_enable = 0;
1208 net->sctp.addip_noauth = 0;
1209 net->sctp.default_auto_asconf = 0;
1211 /* Enable PR-SCTP by default. */
1212 net->sctp.prsctp_enable = 1;
1214 /* Disable RECONF by default. */
1215 net->sctp.reconf_enable = 0;
1217 /* Disable AUTH by default. */
1218 net->sctp.auth_enable = 0;
1220 /* Set SCOPE policy to enabled */
1221 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1223 /* Set the default rwnd update threshold */
1224 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1226 /* Initialize maximum autoclose timeout. */
1227 net->sctp.max_autoclose = INT_MAX / HZ;
1229 status = sctp_sysctl_net_register(net);
1231 goto err_sysctl_register;
1233 /* Allocate and initialise sctp mibs. */
1234 status = init_sctp_mibs(net);
1238 #ifdef CONFIG_PROC_FS
1239 /* Initialize proc fs directory. */
1240 status = sctp_proc_init(net);
1245 sctp_dbg_objcnt_init(net);
1247 /* Initialize the local address list. */
1248 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1249 spin_lock_init(&net->sctp.local_addr_lock);
1250 sctp_get_local_addr_list(net);
1252 /* Initialize the address event list */
1253 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1254 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1255 spin_lock_init(&net->sctp.addr_wq_lock);
1256 net->sctp.addr_wq_timer.expires = 0;
1257 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1262 cleanup_sctp_mibs(net);
1264 sctp_sysctl_net_unregister(net);
1265 err_sysctl_register:
1269 static void __net_exit sctp_defaults_exit(struct net *net)
1271 /* Free the local address list */
1272 sctp_free_addr_wq(net);
1273 sctp_free_local_addr_list(net);
1275 #ifdef CONFIG_PROC_FS
1276 remove_proc_subtree("sctp", net->proc_net);
1277 net->sctp.proc_net_sctp = NULL;
1279 cleanup_sctp_mibs(net);
1280 sctp_sysctl_net_unregister(net);
1283 static struct pernet_operations sctp_defaults_ops = {
1284 .init = sctp_defaults_init,
1285 .exit = sctp_defaults_exit,
1288 static int __net_init sctp_ctrlsock_init(struct net *net)
1292 /* Initialize the control inode/socket for handling OOTB packets. */
1293 status = sctp_ctl_sock_init(net);
1295 pr_err("Failed to initialize the SCTP control sock\n");
1300 static void __net_init sctp_ctrlsock_exit(struct net *net)
1302 /* Free the control endpoint. */
1303 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1306 static struct pernet_operations sctp_ctrlsock_ops = {
1307 .init = sctp_ctrlsock_init,
1308 .exit = sctp_ctrlsock_exit,
1311 /* Initialize the universe into something sensible. */
1312 static __init int sctp_init(void)
1315 int status = -EINVAL;
1317 unsigned long limit;
1321 int max_entry_order;
1323 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1325 /* Allocate bind_bucket and chunk caches. */
1327 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1328 sizeof(struct sctp_bind_bucket),
1329 0, SLAB_HWCACHE_ALIGN,
1331 if (!sctp_bucket_cachep)
1334 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1335 sizeof(struct sctp_chunk),
1336 0, SLAB_HWCACHE_ALIGN,
1338 if (!sctp_chunk_cachep)
1339 goto err_chunk_cachep;
1341 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1343 goto err_percpu_counter_init;
1345 /* Implementation specific variables. */
1347 /* Initialize default stream count setup information. */
1348 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1349 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1351 /* Initialize handle used for association ids. */
1352 idr_init(&sctp_assocs_id);
1354 limit = nr_free_buffer_pages() / 8;
1355 limit = max(limit, 128UL);
1356 sysctl_sctp_mem[0] = limit / 4 * 3;
1357 sysctl_sctp_mem[1] = limit;
1358 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1360 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1361 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1362 max_share = min(4UL*1024*1024, limit);
1364 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1365 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1366 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1368 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1369 sysctl_sctp_wmem[1] = 16*1024;
1370 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1372 /* Size and allocate the association hash table.
1373 * The methodology is similar to that of the tcp hash tables.
1374 * Though not identical. Start by getting a goal size
1376 if (totalram_pages >= (128 * 1024))
1377 goal = totalram_pages >> (22 - PAGE_SHIFT);
1379 goal = totalram_pages >> (24 - PAGE_SHIFT);
1381 /* Then compute the page order for said goal */
1382 order = get_order(goal);
1384 /* Now compute the required page order for the maximum sized table we
1387 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1388 sizeof(struct sctp_bind_hashbucket));
1390 /* Limit the page order by that maximum hash table size */
1391 order = min(order, max_entry_order);
1393 /* Allocate and initialize the endpoint hash table. */
1394 sctp_ep_hashsize = 64;
1396 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1397 if (!sctp_ep_hashtable) {
1398 pr_err("Failed endpoint_hash alloc\n");
1400 goto err_ehash_alloc;
1402 for (i = 0; i < sctp_ep_hashsize; i++) {
1403 rwlock_init(&sctp_ep_hashtable[i].lock);
1404 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1407 /* Allocate and initialize the SCTP port hash table.
1408 * Note that order is initalized to start at the max sized
1409 * table we want to support. If we can't get that many pages
1410 * reduce the order and try again
1413 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1414 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1415 } while (!sctp_port_hashtable && --order > 0);
1417 if (!sctp_port_hashtable) {
1418 pr_err("Failed bind hash alloc\n");
1420 goto err_bhash_alloc;
1423 /* Now compute the number of entries that will fit in the
1424 * port hash space we allocated
1426 num_entries = (1UL << order) * PAGE_SIZE /
1427 sizeof(struct sctp_bind_hashbucket);
1429 /* And finish by rounding it down to the nearest power of two
1430 * this wastes some memory of course, but its needed because
1431 * the hash function operates based on the assumption that
1432 * that the number of entries is a power of two
1434 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1436 for (i = 0; i < sctp_port_hashsize; i++) {
1437 spin_lock_init(&sctp_port_hashtable[i].lock);
1438 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1441 status = sctp_transport_hashtable_init();
1443 goto err_thash_alloc;
1445 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1448 sctp_sysctl_register();
1450 INIT_LIST_HEAD(&sctp_address_families);
1453 sctp_sched_ops_init();
1455 status = register_pernet_subsys(&sctp_defaults_ops);
1457 goto err_register_defaults;
1459 status = sctp_v4_protosw_init();
1461 goto err_protosw_init;
1463 status = sctp_v6_protosw_init();
1465 goto err_v6_protosw_init;
1467 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1469 goto err_register_ctrlsock;
1471 status = sctp_v4_add_protocol();
1473 goto err_add_protocol;
1475 /* Register SCTP with inet6 layer. */
1476 status = sctp_v6_add_protocol();
1478 goto err_v6_add_protocol;
1480 if (sctp_offload_init() < 0)
1481 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1485 err_v6_add_protocol:
1486 sctp_v4_del_protocol();
1488 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1489 err_register_ctrlsock:
1490 sctp_v6_protosw_exit();
1491 err_v6_protosw_init:
1492 sctp_v4_protosw_exit();
1494 unregister_pernet_subsys(&sctp_defaults_ops);
1495 err_register_defaults:
1498 sctp_sysctl_unregister();
1499 free_pages((unsigned long)sctp_port_hashtable,
1500 get_order(sctp_port_hashsize *
1501 sizeof(struct sctp_bind_hashbucket)));
1503 sctp_transport_hashtable_destroy();
1505 kfree(sctp_ep_hashtable);
1507 percpu_counter_destroy(&sctp_sockets_allocated);
1508 err_percpu_counter_init:
1509 kmem_cache_destroy(sctp_chunk_cachep);
1511 kmem_cache_destroy(sctp_bucket_cachep);
1515 /* Exit handler for the SCTP protocol. */
1516 static __exit void sctp_exit(void)
1518 /* BUG. This should probably do something useful like clean
1519 * up all the remaining associations and all that memory.
1522 /* Unregister with inet6/inet layers. */
1523 sctp_v6_del_protocol();
1524 sctp_v4_del_protocol();
1526 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1528 /* Free protosw registrations */
1529 sctp_v6_protosw_exit();
1530 sctp_v4_protosw_exit();
1532 unregister_pernet_subsys(&sctp_defaults_ops);
1534 /* Unregister with socket layer. */
1538 sctp_sysctl_unregister();
1540 free_pages((unsigned long)sctp_port_hashtable,
1541 get_order(sctp_port_hashsize *
1542 sizeof(struct sctp_bind_hashbucket)));
1543 kfree(sctp_ep_hashtable);
1544 sctp_transport_hashtable_destroy();
1546 percpu_counter_destroy(&sctp_sockets_allocated);
1548 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1550 kmem_cache_destroy(sctp_chunk_cachep);
1551 kmem_cache_destroy(sctp_bucket_cachep);
1554 module_init(sctp_init);
1555 module_exit(sctp_exit);
1558 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1560 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1561 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1562 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1563 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1564 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1565 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1566 MODULE_LICENSE("GPL");