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) {
515 dst_release(&rt->dst);
528 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
529 &fl4->daddr, &fl4->saddr);
531 pr_debug("no route\n");
534 /* For v4, the source address is cached in the route entry(dst). So no need
535 * to cache it separately and hence this is an empty routine.
537 static void sctp_v4_get_saddr(struct sctp_sock *sk,
538 struct sctp_transport *t,
541 union sctp_addr *saddr = &t->saddr;
542 struct rtable *rt = (struct rtable *)t->dst;
545 saddr->v4.sin_family = AF_INET;
546 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
550 /* What interface did this skb arrive on? */
551 static int sctp_v4_skb_iif(const struct sk_buff *skb)
553 return inet_iif(skb);
556 /* Was this packet marked by Explicit Congestion Notification? */
557 static int sctp_v4_is_ce(const struct sk_buff *skb)
559 return INET_ECN_is_ce(ip_hdr(skb)->tos);
562 /* Create and initialize a new sk for the socket returned by accept(). */
563 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
564 struct sctp_association *asoc)
566 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
568 struct inet_sock *newinet;
573 sock_init_data(NULL, newsk);
575 sctp_copy_sock(newsk, sk, asoc);
576 sock_reset_flag(newsk, SOCK_ZAPPED);
578 newinet = inet_sk(newsk);
580 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
582 sk_refcnt_debug_inc(newsk);
584 if (newsk->sk_prot->init(newsk)) {
585 sk_common_release(newsk);
593 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
595 /* No address mapping for V4 sockets */
596 return sizeof(struct sockaddr_in);
599 /* Dump the v4 addr to the seq file. */
600 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
602 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
605 static void sctp_v4_ecn_capable(struct sock *sk)
610 static void sctp_addr_wq_timeout_handler(unsigned long arg)
612 struct net *net = (struct net *)arg;
613 struct sctp_sockaddr_entry *addrw, *temp;
614 struct sctp_sock *sp;
616 spin_lock_bh(&net->sctp.addr_wq_lock);
618 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
619 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
620 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
621 addrw->state, addrw);
623 #if IS_ENABLED(CONFIG_IPV6)
624 /* Now we send an ASCONF for each association */
625 /* Note. we currently don't handle link local IPv6 addressees */
626 if (addrw->a.sa.sa_family == AF_INET6) {
627 struct in6_addr *in6;
629 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
633 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
634 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
635 addrw->state == SCTP_ADDR_NEW) {
636 unsigned long timeo_val;
638 pr_debug("%s: this is on DAD, trying %d sec "
640 SCTP_ADDRESS_TICK_DELAY);
643 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
644 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
649 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
652 sk = sctp_opt2sk(sp);
653 /* ignore bound-specific endpoints */
654 if (!sctp_is_ep_boundall(sk))
657 if (sctp_asconf_mgmt(sp, addrw) < 0)
658 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
661 #if IS_ENABLED(CONFIG_IPV6)
664 list_del(&addrw->list);
667 spin_unlock_bh(&net->sctp.addr_wq_lock);
670 static void sctp_free_addr_wq(struct net *net)
672 struct sctp_sockaddr_entry *addrw;
673 struct sctp_sockaddr_entry *temp;
675 spin_lock_bh(&net->sctp.addr_wq_lock);
676 del_timer(&net->sctp.addr_wq_timer);
677 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
678 list_del(&addrw->list);
681 spin_unlock_bh(&net->sctp.addr_wq_lock);
684 /* lookup the entry for the same address in the addr_waitq
685 * sctp_addr_wq MUST be locked
687 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
688 struct sctp_sockaddr_entry *addr)
690 struct sctp_sockaddr_entry *addrw;
692 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
693 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
695 if (addrw->a.sa.sa_family == AF_INET) {
696 if (addrw->a.v4.sin_addr.s_addr ==
697 addr->a.v4.sin_addr.s_addr)
699 } else if (addrw->a.sa.sa_family == AF_INET6) {
700 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
701 &addr->a.v6.sin6_addr))
708 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
710 struct sctp_sockaddr_entry *addrw;
711 unsigned long timeo_val;
713 /* first, we check if an opposite message already exist in the queue.
714 * If we found such message, it is removed.
715 * This operation is a bit stupid, but the DHCP client attaches the
716 * new address after a couple of addition and deletion of that address
719 spin_lock_bh(&net->sctp.addr_wq_lock);
720 /* Offsets existing events in addr_wq */
721 addrw = sctp_addr_wq_lookup(net, addr);
723 if (addrw->state != cmd) {
724 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
725 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
726 &net->sctp.addr_waitq);
728 list_del(&addrw->list);
731 spin_unlock_bh(&net->sctp.addr_wq_lock);
735 /* OK, we have to add the new address to the wait queue */
736 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
738 spin_unlock_bh(&net->sctp.addr_wq_lock);
742 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
744 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
745 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
747 if (!timer_pending(&net->sctp.addr_wq_timer)) {
749 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
750 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
752 spin_unlock_bh(&net->sctp.addr_wq_lock);
755 /* Event handler for inet address addition/deletion events.
756 * The sctp_local_addr_list needs to be protocted by a spin lock since
757 * multiple notifiers (say IPv4 and IPv6) may be running at the same
758 * time and thus corrupt the list.
759 * The reader side is protected with RCU.
761 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
764 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
765 struct sctp_sockaddr_entry *addr = NULL;
766 struct sctp_sockaddr_entry *temp;
767 struct net *net = dev_net(ifa->ifa_dev->dev);
772 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
774 addr->a.v4.sin_family = AF_INET;
775 addr->a.v4.sin_port = 0;
776 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
778 spin_lock_bh(&net->sctp.local_addr_lock);
779 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
780 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
781 spin_unlock_bh(&net->sctp.local_addr_lock);
785 spin_lock_bh(&net->sctp.local_addr_lock);
786 list_for_each_entry_safe(addr, temp,
787 &net->sctp.local_addr_list, list) {
788 if (addr->a.sa.sa_family == AF_INET &&
789 addr->a.v4.sin_addr.s_addr ==
791 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
794 list_del_rcu(&addr->list);
798 spin_unlock_bh(&net->sctp.local_addr_lock);
800 kfree_rcu(addr, rcu);
808 * Initialize the control inode/socket with a control endpoint data
809 * structure. This endpoint is reserved exclusively for the OOTB processing.
811 static int sctp_ctl_sock_init(struct net *net)
814 sa_family_t family = PF_INET;
816 if (sctp_get_pf_specific(PF_INET6))
819 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
820 SOCK_SEQPACKET, IPPROTO_SCTP, net);
822 /* If IPv6 socket could not be created, try the IPv4 socket */
823 if (err < 0 && family == PF_INET6)
824 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
825 SOCK_SEQPACKET, IPPROTO_SCTP,
829 pr_err("Failed to create the SCTP control socket\n");
835 /* Register address family specific functions. */
836 int sctp_register_af(struct sctp_af *af)
838 switch (af->sa_family) {
840 if (sctp_af_v4_specific)
842 sctp_af_v4_specific = af;
845 if (sctp_af_v6_specific)
847 sctp_af_v6_specific = af;
853 INIT_LIST_HEAD(&af->list);
854 list_add_tail(&af->list, &sctp_address_families);
858 /* Get the table of functions for manipulating a particular address
861 struct sctp_af *sctp_get_af_specific(sa_family_t family)
865 return sctp_af_v4_specific;
867 return sctp_af_v6_specific;
873 /* Common code to initialize a AF_INET msg_name. */
874 static void sctp_inet_msgname(char *msgname, int *addr_len)
876 struct sockaddr_in *sin;
878 sin = (struct sockaddr_in *)msgname;
879 *addr_len = sizeof(struct sockaddr_in);
880 sin->sin_family = AF_INET;
881 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
884 /* Copy the primary address of the peer primary address as the msg_name. */
885 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
888 struct sockaddr_in *sin, *sinfrom;
891 struct sctp_association *asoc;
894 sctp_inet_msgname(msgname, addr_len);
895 sin = (struct sockaddr_in *)msgname;
896 sinfrom = &asoc->peer.primary_addr.v4;
897 sin->sin_port = htons(asoc->peer.port);
898 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
902 /* Initialize and copy out a msgname from an inbound skb. */
903 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
906 struct sctphdr *sh = sctp_hdr(skb);
907 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
909 sctp_inet_msgname(msgname, len);
910 sin->sin_port = sh->source;
911 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
915 /* Do we support this AF? */
916 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
918 /* PF_INET only supports AF_INET addresses. */
919 return AF_INET == family;
922 /* Address matching with wildcards allowed. */
923 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
924 const union sctp_addr *addr2,
925 struct sctp_sock *opt)
927 /* PF_INET only supports AF_INET addresses. */
928 if (addr1->sa.sa_family != addr2->sa.sa_family)
930 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
931 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
933 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
939 /* Verify that provided sockaddr looks bindable. Common verification has
940 * already been taken care of.
942 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
944 return sctp_v4_available(addr, opt);
947 /* Verify that sockaddr looks sendable. Common verification has already
948 * been taken care of.
950 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
955 /* Fill in Supported Address Type information for INIT and INIT-ACK
956 * chunks. Returns number of addresses supported.
958 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
961 types[0] = SCTP_PARAM_IPV4_ADDRESS;
965 /* Wrapper routine that calls the ip transmit routine. */
966 static inline int sctp_v4_xmit(struct sk_buff *skb,
967 struct sctp_transport *transport)
969 struct inet_sock *inet = inet_sk(skb->sk);
971 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
972 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
974 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
975 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
977 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
979 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
982 static struct sctp_af sctp_af_inet;
984 static struct sctp_pf sctp_pf_inet = {
985 .event_msgname = sctp_inet_event_msgname,
986 .skb_msgname = sctp_inet_skb_msgname,
987 .af_supported = sctp_inet_af_supported,
988 .cmp_addr = sctp_inet_cmp_addr,
989 .bind_verify = sctp_inet_bind_verify,
990 .send_verify = sctp_inet_send_verify,
991 .supported_addrs = sctp_inet_supported_addrs,
992 .create_accept_sk = sctp_v4_create_accept_sk,
993 .addr_to_user = sctp_v4_addr_to_user,
994 .to_sk_saddr = sctp_v4_to_sk_saddr,
995 .to_sk_daddr = sctp_v4_to_sk_daddr,
999 /* Notifier for inetaddr addition/deletion events. */
1000 static struct notifier_block sctp_inetaddr_notifier = {
1001 .notifier_call = sctp_inetaddr_event,
1004 /* Socket operations. */
1005 static const struct proto_ops inet_seqpacket_ops = {
1007 .owner = THIS_MODULE,
1008 .release = inet_release, /* Needs to be wrapped... */
1010 .connect = inet_dgram_connect,
1011 .socketpair = sock_no_socketpair,
1012 .accept = inet_accept,
1013 .getname = inet_getname, /* Semantics are different. */
1015 .ioctl = inet_ioctl,
1016 .listen = sctp_inet_listen,
1017 .shutdown = inet_shutdown, /* Looks harmless. */
1018 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1019 .getsockopt = sock_common_getsockopt,
1020 .sendmsg = inet_sendmsg,
1021 .recvmsg = sock_common_recvmsg,
1022 .mmap = sock_no_mmap,
1023 .sendpage = sock_no_sendpage,
1024 #ifdef CONFIG_COMPAT
1025 .compat_setsockopt = compat_sock_common_setsockopt,
1026 .compat_getsockopt = compat_sock_common_getsockopt,
1030 /* Registration with AF_INET family. */
1031 static struct inet_protosw sctp_seqpacket_protosw = {
1032 .type = SOCK_SEQPACKET,
1033 .protocol = IPPROTO_SCTP,
1035 .ops = &inet_seqpacket_ops,
1036 .flags = SCTP_PROTOSW_FLAG
1038 static struct inet_protosw sctp_stream_protosw = {
1039 .type = SOCK_STREAM,
1040 .protocol = IPPROTO_SCTP,
1042 .ops = &inet_seqpacket_ops,
1043 .flags = SCTP_PROTOSW_FLAG
1046 /* Register with IP layer. */
1047 static const struct net_protocol sctp_protocol = {
1048 .handler = sctp_rcv,
1049 .err_handler = sctp_v4_err,
1052 .icmp_strict_tag_validation = 1,
1055 /* IPv4 address related functions. */
1056 static struct sctp_af sctp_af_inet = {
1057 .sa_family = AF_INET,
1058 .sctp_xmit = sctp_v4_xmit,
1059 .setsockopt = ip_setsockopt,
1060 .getsockopt = ip_getsockopt,
1061 .get_dst = sctp_v4_get_dst,
1062 .get_saddr = sctp_v4_get_saddr,
1063 .copy_addrlist = sctp_v4_copy_addrlist,
1064 .from_skb = sctp_v4_from_skb,
1065 .from_sk = sctp_v4_from_sk,
1066 .from_addr_param = sctp_v4_from_addr_param,
1067 .to_addr_param = sctp_v4_to_addr_param,
1068 .cmp_addr = sctp_v4_cmp_addr,
1069 .addr_valid = sctp_v4_addr_valid,
1070 .inaddr_any = sctp_v4_inaddr_any,
1071 .is_any = sctp_v4_is_any,
1072 .available = sctp_v4_available,
1073 .scope = sctp_v4_scope,
1074 .skb_iif = sctp_v4_skb_iif,
1075 .is_ce = sctp_v4_is_ce,
1076 .seq_dump_addr = sctp_v4_seq_dump_addr,
1077 .ecn_capable = sctp_v4_ecn_capable,
1078 .net_header_len = sizeof(struct iphdr),
1079 .sockaddr_len = sizeof(struct sockaddr_in),
1080 #ifdef CONFIG_COMPAT
1081 .compat_setsockopt = compat_ip_setsockopt,
1082 .compat_getsockopt = compat_ip_getsockopt,
1086 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1090 return sctp_pf_inet_specific;
1092 return sctp_pf_inet6_specific;
1098 /* Register the PF specific function table. */
1099 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1103 if (sctp_pf_inet_specific)
1105 sctp_pf_inet_specific = pf;
1108 if (sctp_pf_inet6_specific)
1110 sctp_pf_inet6_specific = pf;
1118 static inline int init_sctp_mibs(struct net *net)
1120 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1121 if (!net->sctp.sctp_statistics)
1126 static inline void cleanup_sctp_mibs(struct net *net)
1128 free_percpu(net->sctp.sctp_statistics);
1131 static void sctp_v4_pf_init(void)
1133 /* Initialize the SCTP specific PF functions. */
1134 sctp_register_pf(&sctp_pf_inet, PF_INET);
1135 sctp_register_af(&sctp_af_inet);
1138 static void sctp_v4_pf_exit(void)
1140 list_del(&sctp_af_inet.list);
1143 static int sctp_v4_protosw_init(void)
1147 rc = proto_register(&sctp_prot, 1);
1151 /* Register SCTP(UDP and TCP style) with socket layer. */
1152 inet_register_protosw(&sctp_seqpacket_protosw);
1153 inet_register_protosw(&sctp_stream_protosw);
1158 static void sctp_v4_protosw_exit(void)
1160 inet_unregister_protosw(&sctp_stream_protosw);
1161 inet_unregister_protosw(&sctp_seqpacket_protosw);
1162 proto_unregister(&sctp_prot);
1165 static int sctp_v4_add_protocol(void)
1167 /* Register notifier for inet address additions/deletions. */
1168 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1170 /* Register SCTP with inet layer. */
1171 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1177 static void sctp_v4_del_protocol(void)
1179 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1180 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1183 static int __net_init sctp_net_init(struct net *net)
1188 * 14. Suggested SCTP Protocol Parameter Values
1190 /* The following protocol parameters are RECOMMENDED: */
1191 /* RTO.Initial - 3 seconds */
1192 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1193 /* RTO.Min - 1 second */
1194 net->sctp.rto_min = SCTP_RTO_MIN;
1195 /* RTO.Max - 60 seconds */
1196 net->sctp.rto_max = SCTP_RTO_MAX;
1197 /* RTO.Alpha - 1/8 */
1198 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1199 /* RTO.Beta - 1/4 */
1200 net->sctp.rto_beta = SCTP_RTO_BETA;
1202 /* Valid.Cookie.Life - 60 seconds */
1203 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1205 /* Whether Cookie Preservative is enabled(1) or not(0) */
1206 net->sctp.cookie_preserve_enable = 1;
1208 /* Default sctp sockets to use md5 as their hmac alg */
1209 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1210 net->sctp.sctp_hmac_alg = "md5";
1211 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1212 net->sctp.sctp_hmac_alg = "sha1";
1214 net->sctp.sctp_hmac_alg = NULL;
1218 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1220 /* Association.Max.Retrans - 10 attempts
1221 * Path.Max.Retrans - 5 attempts (per destination address)
1222 * Max.Init.Retransmits - 8 attempts
1224 net->sctp.max_retrans_association = 10;
1225 net->sctp.max_retrans_path = 5;
1226 net->sctp.max_retrans_init = 8;
1228 /* Sendbuffer growth - do per-socket accounting */
1229 net->sctp.sndbuf_policy = 0;
1231 /* Rcvbuffer growth - do per-socket accounting */
1232 net->sctp.rcvbuf_policy = 0;
1234 /* HB.interval - 30 seconds */
1235 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1237 /* delayed SACK timeout */
1238 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1240 /* Disable ADDIP by default. */
1241 net->sctp.addip_enable = 0;
1242 net->sctp.addip_noauth = 0;
1243 net->sctp.default_auto_asconf = 0;
1245 /* Enable PR-SCTP by default. */
1246 net->sctp.prsctp_enable = 1;
1248 /* Disable AUTH by default. */
1249 net->sctp.auth_enable = 0;
1251 /* Set SCOPE policy to enabled */
1252 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1254 /* Set the default rwnd update threshold */
1255 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1257 /* Initialize maximum autoclose timeout. */
1258 net->sctp.max_autoclose = INT_MAX / HZ;
1260 status = sctp_sysctl_net_register(net);
1262 goto err_sysctl_register;
1264 /* Allocate and initialise sctp mibs. */
1265 status = init_sctp_mibs(net);
1269 /* Initialize proc fs directory. */
1270 status = sctp_proc_init(net);
1274 sctp_dbg_objcnt_init(net);
1276 /* Initialize the control inode/socket for handling OOTB packets. */
1277 if ((status = sctp_ctl_sock_init(net))) {
1278 pr_err("Failed to initialize the SCTP control sock\n");
1279 goto err_ctl_sock_init;
1282 /* Initialize the local address list. */
1283 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1284 spin_lock_init(&net->sctp.local_addr_lock);
1285 sctp_get_local_addr_list(net);
1287 /* Initialize the address event list */
1288 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1289 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1290 spin_lock_init(&net->sctp.addr_wq_lock);
1291 net->sctp.addr_wq_timer.expires = 0;
1292 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1293 (unsigned long)net);
1298 sctp_dbg_objcnt_exit(net);
1299 sctp_proc_exit(net);
1301 cleanup_sctp_mibs(net);
1303 sctp_sysctl_net_unregister(net);
1304 err_sysctl_register:
1308 static void __net_exit sctp_net_exit(struct net *net)
1310 /* Free the local address list */
1311 sctp_free_addr_wq(net);
1312 sctp_free_local_addr_list(net);
1314 /* Free the control endpoint. */
1315 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1317 sctp_dbg_objcnt_exit(net);
1319 sctp_proc_exit(net);
1320 cleanup_sctp_mibs(net);
1321 sctp_sysctl_net_unregister(net);
1324 static struct pernet_operations sctp_net_ops = {
1325 .init = sctp_net_init,
1326 .exit = sctp_net_exit,
1329 /* Initialize the universe into something sensible. */
1330 static __init int sctp_init(void)
1333 int status = -EINVAL;
1335 unsigned long limit;
1339 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1341 /* Allocate bind_bucket and chunk caches. */
1343 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1344 sizeof(struct sctp_bind_bucket),
1345 0, SLAB_HWCACHE_ALIGN,
1347 if (!sctp_bucket_cachep)
1350 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1351 sizeof(struct sctp_chunk),
1352 0, SLAB_HWCACHE_ALIGN,
1354 if (!sctp_chunk_cachep)
1355 goto err_chunk_cachep;
1357 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1359 goto err_percpu_counter_init;
1361 /* Implementation specific variables. */
1363 /* Initialize default stream count setup information. */
1364 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1365 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1367 /* Initialize handle used for association ids. */
1368 idr_init(&sctp_assocs_id);
1370 limit = nr_free_buffer_pages() / 8;
1371 limit = max(limit, 128UL);
1372 sysctl_sctp_mem[0] = limit / 4 * 3;
1373 sysctl_sctp_mem[1] = limit;
1374 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1376 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1377 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1378 max_share = min(4UL*1024*1024, limit);
1380 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1381 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1382 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1384 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1385 sysctl_sctp_wmem[1] = 16*1024;
1386 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1388 /* Size and allocate the association hash table.
1389 * The methodology is similar to that of the tcp hash tables.
1391 if (totalram_pages >= (128 * 1024))
1392 goal = totalram_pages >> (22 - PAGE_SHIFT);
1394 goal = totalram_pages >> (24 - PAGE_SHIFT);
1396 for (order = 0; (1UL << order) < goal; order++)
1400 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1401 sizeof(struct sctp_hashbucket);
1402 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1404 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1405 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1406 } while (!sctp_assoc_hashtable && --order > 0);
1407 if (!sctp_assoc_hashtable) {
1408 pr_err("Failed association hash alloc\n");
1410 goto err_ahash_alloc;
1412 for (i = 0; i < sctp_assoc_hashsize; i++) {
1413 rwlock_init(&sctp_assoc_hashtable[i].lock);
1414 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1417 /* Allocate and initialize the endpoint hash table. */
1418 sctp_ep_hashsize = 64;
1420 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1421 if (!sctp_ep_hashtable) {
1422 pr_err("Failed endpoint_hash alloc\n");
1424 goto err_ehash_alloc;
1426 for (i = 0; i < sctp_ep_hashsize; i++) {
1427 rwlock_init(&sctp_ep_hashtable[i].lock);
1428 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1431 /* Allocate and initialize the SCTP port hash table. */
1433 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1434 sizeof(struct sctp_bind_hashbucket);
1435 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1437 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1438 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1439 } while (!sctp_port_hashtable && --order > 0);
1440 if (!sctp_port_hashtable) {
1441 pr_err("Failed bind hash alloc\n");
1443 goto err_bhash_alloc;
1445 for (i = 0; i < sctp_port_hashsize; i++) {
1446 spin_lock_init(&sctp_port_hashtable[i].lock);
1447 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1450 pr_info("Hash tables configured (established %d bind %d)\n",
1451 sctp_assoc_hashsize, sctp_port_hashsize);
1453 sctp_sysctl_register();
1455 INIT_LIST_HEAD(&sctp_address_families);
1459 status = sctp_v4_protosw_init();
1462 goto err_protosw_init;
1464 status = sctp_v6_protosw_init();
1466 goto err_v6_protosw_init;
1468 status = register_pernet_subsys(&sctp_net_ops);
1470 goto err_register_pernet_subsys;
1472 status = sctp_v4_add_protocol();
1474 goto err_add_protocol;
1476 /* Register SCTP with inet6 layer. */
1477 status = sctp_v6_add_protocol();
1479 goto err_v6_add_protocol;
1483 err_v6_add_protocol:
1484 sctp_v4_del_protocol();
1486 unregister_pernet_subsys(&sctp_net_ops);
1487 err_register_pernet_subsys:
1488 sctp_v6_protosw_exit();
1489 err_v6_protosw_init:
1490 sctp_v4_protosw_exit();
1494 sctp_sysctl_unregister();
1495 free_pages((unsigned long)sctp_port_hashtable,
1496 get_order(sctp_port_hashsize *
1497 sizeof(struct sctp_bind_hashbucket)));
1499 kfree(sctp_ep_hashtable);
1501 free_pages((unsigned long)sctp_assoc_hashtable,
1502 get_order(sctp_assoc_hashsize *
1503 sizeof(struct sctp_hashbucket)));
1505 percpu_counter_destroy(&sctp_sockets_allocated);
1506 err_percpu_counter_init:
1507 kmem_cache_destroy(sctp_chunk_cachep);
1509 kmem_cache_destroy(sctp_bucket_cachep);
1513 /* Exit handler for the SCTP protocol. */
1514 static __exit void sctp_exit(void)
1516 /* BUG. This should probably do something useful like clean
1517 * up all the remaining associations and all that memory.
1520 /* Unregister with inet6/inet layers. */
1521 sctp_v6_del_protocol();
1522 sctp_v4_del_protocol();
1524 unregister_pernet_subsys(&sctp_net_ops);
1526 /* Free protosw registrations */
1527 sctp_v6_protosw_exit();
1528 sctp_v4_protosw_exit();
1530 /* Unregister with socket layer. */
1534 sctp_sysctl_unregister();
1536 free_pages((unsigned long)sctp_assoc_hashtable,
1537 get_order(sctp_assoc_hashsize *
1538 sizeof(struct sctp_hashbucket)));
1539 kfree(sctp_ep_hashtable);
1540 free_pages((unsigned long)sctp_port_hashtable,
1541 get_order(sctp_port_hashsize *
1542 sizeof(struct sctp_bind_hashbucket)));
1544 percpu_counter_destroy(&sctp_sockets_allocated);
1546 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1548 kmem_cache_destroy(sctp_chunk_cachep);
1549 kmem_cache_destroy(sctp_bucket_cachep);
1552 module_init(sctp_init);
1553 module_exit(sctp_exit);
1556 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1558 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1559 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1560 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1561 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1562 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1563 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1564 MODULE_LICENSE("GPL");