1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/inetdevice.h>
48 #include <linux/seq_file.h>
49 #include <linux/bootmem.h>
50 #include <linux/highmem.h>
51 #include <linux/swap.h>
52 #include <linux/slab.h>
53 #include <net/net_namespace.h>
54 #include <net/protocol.h>
57 #include <net/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
63 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
65 /* Global data structures. */
66 struct sctp_globals sctp_globals __read_mostly;
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
71 static struct sctp_pf *sctp_pf_inet6_specific;
72 static struct sctp_pf *sctp_pf_inet_specific;
73 static struct sctp_af *sctp_af_v4_specific;
74 static struct sctp_af *sctp_af_v6_specific;
76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
79 long sysctl_sctp_mem[3];
80 int sysctl_sctp_rmem[3];
81 int sysctl_sctp_wmem[3];
83 /* Set up the proc fs entry for the SCTP protocol. */
84 static int __net_init sctp_proc_init(struct net *net)
87 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
88 if (!net->sctp.proc_net_sctp)
89 goto out_proc_net_sctp;
90 if (sctp_snmp_proc_init(net))
91 goto out_snmp_proc_init;
92 if (sctp_eps_proc_init(net))
93 goto out_eps_proc_init;
94 if (sctp_assocs_proc_init(net))
95 goto out_assocs_proc_init;
96 if (sctp_remaddr_proc_init(net))
97 goto out_remaddr_proc_init;
101 out_remaddr_proc_init:
102 sctp_assocs_proc_exit(net);
103 out_assocs_proc_init:
104 sctp_eps_proc_exit(net);
106 sctp_snmp_proc_exit(net);
108 remove_proc_entry("sctp", net->proc_net);
109 net->sctp.proc_net_sctp = NULL;
112 #endif /* CONFIG_PROC_FS */
116 /* Clean up the proc fs entry for the SCTP protocol.
117 * Note: Do not make this __exit as it is used in the init error
120 static void sctp_proc_exit(struct net *net)
122 #ifdef CONFIG_PROC_FS
123 sctp_snmp_proc_exit(net);
124 sctp_eps_proc_exit(net);
125 sctp_assocs_proc_exit(net);
126 sctp_remaddr_proc_exit(net);
128 remove_proc_entry("sctp", net->proc_net);
129 net->sctp.proc_net_sctp = NULL;
133 /* Private helper to extract ipv4 address and stash them in
134 * the protocol structure.
136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
137 struct net_device *dev)
139 struct in_device *in_dev;
140 struct in_ifaddr *ifa;
141 struct sctp_sockaddr_entry *addr;
144 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
149 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
150 /* Add the address to the local list. */
151 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
153 addr->a.v4.sin_family = AF_INET;
154 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
156 INIT_LIST_HEAD(&addr->list);
157 list_add_tail(&addr->list, addrlist);
164 /* Extract our IP addresses from the system and stash them in the
165 * protocol structure.
167 static void sctp_get_local_addr_list(struct net *net)
169 struct net_device *dev;
170 struct list_head *pos;
174 for_each_netdev_rcu(net, dev) {
175 list_for_each(pos, &sctp_address_families) {
176 af = list_entry(pos, struct sctp_af, list);
177 af->copy_addrlist(&net->sctp.local_addr_list, dev);
183 /* Free the existing local addresses. */
184 static void sctp_free_local_addr_list(struct net *net)
186 struct sctp_sockaddr_entry *addr;
187 struct list_head *pos, *temp;
189 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
190 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
196 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
197 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
198 enum sctp_scope scope, gfp_t gfp, int copy_flags)
200 struct sctp_sockaddr_entry *addr;
201 union sctp_addr laddr;
205 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
208 if (!sctp_in_scope(net, &addr->a, scope))
211 /* Now that the address is in scope, check to see if
212 * the address type is really supported by the local
213 * sock as well as the remote peer.
215 if (addr->a.sa.sa_family == AF_INET &&
216 (!(copy_flags & SCTP_ADDR4_ALLOWED) ||
217 !(copy_flags & SCTP_ADDR4_PEERSUPP)))
219 if (addr->a.sa.sa_family == AF_INET6 &&
220 (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
221 !(copy_flags & SCTP_ADDR6_PEERSUPP)))
225 /* also works for setting ipv6 address port */
226 laddr.v4.sin_port = htons(bp->port);
227 if (sctp_bind_addr_state(bp, &laddr) != -1)
230 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
231 SCTP_ADDR_SRC, GFP_ATOMIC);
240 /* Initialize a sctp_addr from in incoming skb. */
241 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
244 /* Always called on head skb, so this is safe */
245 struct sctphdr *sh = sctp_hdr(skb);
246 struct sockaddr_in *sa = &addr->v4;
248 addr->v4.sin_family = AF_INET;
251 sa->sin_port = sh->source;
252 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
254 sa->sin_port = sh->dest;
255 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
257 memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
260 /* Initialize an sctp_addr from a socket. */
261 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
263 addr->v4.sin_family = AF_INET;
264 addr->v4.sin_port = 0;
265 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
266 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
269 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
270 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
272 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
275 /* Initialize sk->sk_daddr from sctp_addr. */
276 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
278 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
281 /* Initialize a sctp_addr from an address parameter. */
282 static bool sctp_v4_from_addr_param(union sctp_addr *addr,
283 union sctp_addr_param *param,
284 __be16 port, int iif)
286 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param))
289 addr->v4.sin_family = AF_INET;
290 addr->v4.sin_port = port;
291 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
292 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
297 /* Initialize an address parameter from a sctp_addr and return the length
298 * of the address parameter.
300 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
301 union sctp_addr_param *param)
303 int length = sizeof(struct sctp_ipv4addr_param);
305 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
306 param->v4.param_hdr.length = htons(length);
307 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
312 /* Initialize a sctp_addr from a dst_entry. */
313 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
316 saddr->v4.sin_family = AF_INET;
317 saddr->v4.sin_port = port;
318 saddr->v4.sin_addr.s_addr = fl4->saddr;
319 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
322 /* Compare two addresses exactly. */
323 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
324 const union sctp_addr *addr2)
326 if (addr1->sa.sa_family != addr2->sa.sa_family)
328 if (addr1->v4.sin_port != addr2->v4.sin_port)
330 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
336 /* Initialize addr struct to INADDR_ANY. */
337 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
339 addr->v4.sin_family = AF_INET;
340 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
341 addr->v4.sin_port = port;
342 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
345 /* Is this a wildcard address? */
346 static int sctp_v4_is_any(const union sctp_addr *addr)
348 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
351 /* This function checks if the address is a valid address to be used for
355 * Return 0 - If the address is a non-unicast or an illegal address.
356 * Return 1 - If the address is a unicast.
358 static int sctp_v4_addr_valid(union sctp_addr *addr,
359 struct sctp_sock *sp,
360 const struct sk_buff *skb)
362 /* IPv4 addresses not allowed */
363 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
366 /* Is this a non-unicast address or a unusable SCTP address? */
367 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
370 /* Is this a broadcast address? */
371 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
377 /* Should this be available for binding? */
378 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
380 struct net *net = sock_net(&sp->inet.sk);
381 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
384 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
386 !sp->inet.freebind &&
387 !net->ipv4.sysctl_ip_nonlocal_bind)
390 if (ipv6_only_sock(sctp_opt2sk(sp)))
396 /* Checking the loopback, private and other address scopes as defined in
397 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
398 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
400 * Level 0 - unusable SCTP addresses
401 * Level 1 - loopback address
402 * Level 2 - link-local addresses
403 * Level 3 - private addresses.
404 * Level 4 - global addresses
405 * For INIT and INIT-ACK address list, let L be the level of
406 * of requested destination address, sender and receiver
407 * SHOULD include all of its addresses with level greater
408 * than or equal to L.
410 * IPv4 scoping can be controlled through sysctl option
411 * net.sctp.addr_scope_policy
413 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
415 enum sctp_scope retval;
417 /* Check for unusable SCTP addresses. */
418 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
419 retval = SCTP_SCOPE_UNUSABLE;
420 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
421 retval = SCTP_SCOPE_LOOPBACK;
422 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
423 retval = SCTP_SCOPE_LINK;
424 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
425 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
426 ipv4_is_private_192(addr->v4.sin_addr.s_addr) ||
427 ipv4_is_test_198(addr->v4.sin_addr.s_addr)) {
428 retval = SCTP_SCOPE_PRIVATE;
430 retval = SCTP_SCOPE_GLOBAL;
436 /* Returns a valid dst cache entry for the given source and destination ip
437 * addresses. If an association is passed, trys to get a dst entry with a
438 * source address that matches an address in the bind address list.
440 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
441 struct flowi *fl, struct sock *sk)
443 struct sctp_association *asoc = t->asoc;
446 struct flowi4 *fl4 = &_fl.u.ip4;
447 struct sctp_bind_addr *bp;
448 struct sctp_sockaddr_entry *laddr;
449 struct dst_entry *dst = NULL;
450 union sctp_addr *daddr = &t->ipaddr;
451 union sctp_addr dst_saddr;
453 memset(&_fl, 0x0, sizeof(_fl));
454 fl4->daddr = daddr->v4.sin_addr.s_addr;
455 fl4->fl4_dport = daddr->v4.sin_port;
456 fl4->flowi4_proto = IPPROTO_SCTP;
458 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
459 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
460 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
463 fl4->saddr = saddr->v4.sin_addr.s_addr;
464 fl4->fl4_sport = saddr->v4.sin_port;
467 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
470 rt = ip_route_output_key(sock_net(sk), fl4);
474 memcpy(fl, &_fl, sizeof(_fl));
477 /* If there is no association or if a source address is passed, no
478 * more validation is required.
483 bp = &asoc->base.bind_addr;
486 /* Walk through the bind address list and look for a bind
487 * address that matches the source address of the returned dst.
489 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
491 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
492 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
493 (laddr->state != SCTP_ADDR_SRC &&
494 !asoc->src_out_of_asoc_ok))
496 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
501 /* None of the bound addresses match the source address of the
502 * dst. So release it.
508 /* Walk through the bind address list and try to get a dst that
509 * matches a bind address as the source address.
512 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
513 struct net_device *odev;
517 if (laddr->state != SCTP_ADDR_SRC ||
518 AF_INET != laddr->a.sa.sa_family)
521 fl4->fl4_sport = laddr->a.v4.sin_port;
522 flowi4_update_output(fl4,
523 asoc->base.sk->sk_bound_dev_if,
524 RT_CONN_FLAGS(asoc->base.sk),
525 daddr->v4.sin_addr.s_addr,
526 laddr->a.v4.sin_addr.s_addr);
528 rt = ip_route_output_key(sock_net(sk), fl4);
532 /* Ensure the src address belongs to the output
535 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
537 if (!odev || odev->ifindex != fl4->flowi4_oif) {
541 memcpy(fl, &_fl, sizeof(_fl));
543 dst_release(&rt->dst);
551 memcpy(fl, &_fl, sizeof(_fl));
559 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
560 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
563 pr_debug("no route\n");
567 /* For v4, the source address is cached in the route entry(dst). So no need
568 * to cache it separately and hence this is an empty routine.
570 static void sctp_v4_get_saddr(struct sctp_sock *sk,
571 struct sctp_transport *t,
574 union sctp_addr *saddr = &t->saddr;
575 struct rtable *rt = (struct rtable *)t->dst;
578 saddr->v4.sin_family = AF_INET;
579 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
583 /* What interface did this skb arrive on? */
584 static int sctp_v4_skb_iif(const struct sk_buff *skb)
586 return inet_iif(skb);
589 /* Was this packet marked by Explicit Congestion Notification? */
590 static int sctp_v4_is_ce(const struct sk_buff *skb)
592 return INET_ECN_is_ce(ip_hdr(skb)->tos);
595 /* Create and initialize a new sk for the socket returned by accept(). */
596 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
597 struct sctp_association *asoc,
600 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
602 struct inet_sock *newinet;
607 sock_init_data(NULL, newsk);
609 sctp_copy_sock(newsk, sk, asoc);
610 sock_reset_flag(newsk, SOCK_ZAPPED);
612 newinet = inet_sk(newsk);
614 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
616 sk_refcnt_debug_inc(newsk);
618 if (newsk->sk_prot->init(newsk)) {
619 sk_common_release(newsk);
627 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
629 /* No address mapping for V4 sockets */
630 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
631 return sizeof(struct sockaddr_in);
634 /* Dump the v4 addr to the seq file. */
635 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
637 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
640 static void sctp_v4_ecn_capable(struct sock *sk)
645 static void sctp_addr_wq_timeout_handler(unsigned long arg)
647 struct net *net = (struct net *)arg;
648 struct sctp_sockaddr_entry *addrw, *temp;
649 struct sctp_sock *sp;
651 spin_lock_bh(&net->sctp.addr_wq_lock);
653 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
654 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
655 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
656 addrw->state, addrw);
658 #if IS_ENABLED(CONFIG_IPV6)
659 /* Now we send an ASCONF for each association */
660 /* Note. we currently don't handle link local IPv6 addressees */
661 if (addrw->a.sa.sa_family == AF_INET6) {
662 struct in6_addr *in6;
664 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
668 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
669 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
670 addrw->state == SCTP_ADDR_NEW) {
671 unsigned long timeo_val;
673 pr_debug("%s: this is on DAD, trying %d sec "
675 SCTP_ADDRESS_TICK_DELAY);
678 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
679 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
684 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
687 sk = sctp_opt2sk(sp);
688 /* ignore bound-specific endpoints */
689 if (!sctp_is_ep_boundall(sk))
692 if (sctp_asconf_mgmt(sp, addrw) < 0)
693 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
696 #if IS_ENABLED(CONFIG_IPV6)
699 list_del(&addrw->list);
702 spin_unlock_bh(&net->sctp.addr_wq_lock);
705 static void sctp_free_addr_wq(struct net *net)
707 struct sctp_sockaddr_entry *addrw;
708 struct sctp_sockaddr_entry *temp;
710 spin_lock_bh(&net->sctp.addr_wq_lock);
711 del_timer(&net->sctp.addr_wq_timer);
712 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
713 list_del(&addrw->list);
716 spin_unlock_bh(&net->sctp.addr_wq_lock);
719 /* lookup the entry for the same address in the addr_waitq
720 * sctp_addr_wq MUST be locked
722 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
723 struct sctp_sockaddr_entry *addr)
725 struct sctp_sockaddr_entry *addrw;
727 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
728 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
730 if (addrw->a.sa.sa_family == AF_INET) {
731 if (addrw->a.v4.sin_addr.s_addr ==
732 addr->a.v4.sin_addr.s_addr)
734 } else if (addrw->a.sa.sa_family == AF_INET6) {
735 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
736 &addr->a.v6.sin6_addr))
743 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
745 struct sctp_sockaddr_entry *addrw;
746 unsigned long timeo_val;
748 /* first, we check if an opposite message already exist in the queue.
749 * If we found such message, it is removed.
750 * This operation is a bit stupid, but the DHCP client attaches the
751 * new address after a couple of addition and deletion of that address
754 spin_lock_bh(&net->sctp.addr_wq_lock);
755 /* Offsets existing events in addr_wq */
756 addrw = sctp_addr_wq_lookup(net, addr);
758 if (addrw->state != cmd) {
759 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
760 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
761 &net->sctp.addr_waitq);
763 list_del(&addrw->list);
766 spin_unlock_bh(&net->sctp.addr_wq_lock);
770 /* OK, we have to add the new address to the wait queue */
771 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
773 spin_unlock_bh(&net->sctp.addr_wq_lock);
777 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
779 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
780 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
782 if (!timer_pending(&net->sctp.addr_wq_timer)) {
784 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
785 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
787 spin_unlock_bh(&net->sctp.addr_wq_lock);
790 /* Event handler for inet address addition/deletion events.
791 * The sctp_local_addr_list needs to be protocted by a spin lock since
792 * multiple notifiers (say IPv4 and IPv6) may be running at the same
793 * time and thus corrupt the list.
794 * The reader side is protected with RCU.
796 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
799 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
800 struct sctp_sockaddr_entry *addr = NULL;
801 struct sctp_sockaddr_entry *temp;
802 struct net *net = dev_net(ifa->ifa_dev->dev);
807 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
809 addr->a.v4.sin_family = AF_INET;
810 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
812 spin_lock_bh(&net->sctp.local_addr_lock);
813 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
814 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
815 spin_unlock_bh(&net->sctp.local_addr_lock);
819 spin_lock_bh(&net->sctp.local_addr_lock);
820 list_for_each_entry_safe(addr, temp,
821 &net->sctp.local_addr_list, list) {
822 if (addr->a.sa.sa_family == AF_INET &&
823 addr->a.v4.sin_addr.s_addr ==
825 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
828 list_del_rcu(&addr->list);
832 spin_unlock_bh(&net->sctp.local_addr_lock);
834 kfree_rcu(addr, rcu);
842 * Initialize the control inode/socket with a control endpoint data
843 * structure. This endpoint is reserved exclusively for the OOTB processing.
845 static int sctp_ctl_sock_init(struct net *net)
848 sa_family_t family = PF_INET;
850 if (sctp_get_pf_specific(PF_INET6))
853 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
854 SOCK_SEQPACKET, IPPROTO_SCTP, net);
856 /* If IPv6 socket could not be created, try the IPv4 socket */
857 if (err < 0 && family == PF_INET6)
858 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
859 SOCK_SEQPACKET, IPPROTO_SCTP,
863 pr_err("Failed to create the SCTP control socket\n");
869 /* Register address family specific functions. */
870 int sctp_register_af(struct sctp_af *af)
872 switch (af->sa_family) {
874 if (sctp_af_v4_specific)
876 sctp_af_v4_specific = af;
879 if (sctp_af_v6_specific)
881 sctp_af_v6_specific = af;
887 INIT_LIST_HEAD(&af->list);
888 list_add_tail(&af->list, &sctp_address_families);
892 /* Get the table of functions for manipulating a particular address
895 struct sctp_af *sctp_get_af_specific(sa_family_t family)
899 return sctp_af_v4_specific;
901 return sctp_af_v6_specific;
907 /* Common code to initialize a AF_INET msg_name. */
908 static void sctp_inet_msgname(char *msgname, int *addr_len)
910 struct sockaddr_in *sin;
912 sin = (struct sockaddr_in *)msgname;
913 *addr_len = sizeof(struct sockaddr_in);
914 sin->sin_family = AF_INET;
915 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
918 /* Copy the primary address of the peer primary address as the msg_name. */
919 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
922 struct sockaddr_in *sin, *sinfrom;
925 struct sctp_association *asoc;
928 sctp_inet_msgname(msgname, addr_len);
929 sin = (struct sockaddr_in *)msgname;
930 sinfrom = &asoc->peer.primary_addr.v4;
931 sin->sin_port = htons(asoc->peer.port);
932 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
936 /* Initialize and copy out a msgname from an inbound skb. */
937 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
940 struct sctphdr *sh = sctp_hdr(skb);
941 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
943 sctp_inet_msgname(msgname, len);
944 sin->sin_port = sh->source;
945 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
949 /* Do we support this AF? */
950 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
952 /* PF_INET only supports AF_INET addresses. */
953 return AF_INET == family;
956 /* Address matching with wildcards allowed. */
957 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
958 const union sctp_addr *addr2,
959 struct sctp_sock *opt)
961 /* PF_INET only supports AF_INET addresses. */
962 if (addr1->sa.sa_family != addr2->sa.sa_family)
964 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
965 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
967 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
973 /* Verify that provided sockaddr looks bindable. Common verification has
974 * already been taken care of.
976 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
978 return sctp_v4_available(addr, opt);
981 /* Verify that sockaddr looks sendable. Common verification has already
982 * been taken care of.
984 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
989 /* Fill in Supported Address Type information for INIT and INIT-ACK
990 * chunks. Returns number of addresses supported.
992 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
995 types[0] = SCTP_PARAM_IPV4_ADDRESS;
999 /* Wrapper routine that calls the ip transmit routine. */
1000 static inline int sctp_v4_xmit(struct sk_buff *skb,
1001 struct sctp_transport *transport)
1003 struct inet_sock *inet = inet_sk(skb->sk);
1005 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
1006 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
1008 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
1009 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
1011 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
1013 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
1016 static struct sctp_af sctp_af_inet;
1018 static struct sctp_pf sctp_pf_inet = {
1019 .event_msgname = sctp_inet_event_msgname,
1020 .skb_msgname = sctp_inet_skb_msgname,
1021 .af_supported = sctp_inet_af_supported,
1022 .cmp_addr = sctp_inet_cmp_addr,
1023 .bind_verify = sctp_inet_bind_verify,
1024 .send_verify = sctp_inet_send_verify,
1025 .supported_addrs = sctp_inet_supported_addrs,
1026 .create_accept_sk = sctp_v4_create_accept_sk,
1027 .addr_to_user = sctp_v4_addr_to_user,
1028 .to_sk_saddr = sctp_v4_to_sk_saddr,
1029 .to_sk_daddr = sctp_v4_to_sk_daddr,
1033 /* Notifier for inetaddr addition/deletion events. */
1034 static struct notifier_block sctp_inetaddr_notifier = {
1035 .notifier_call = sctp_inetaddr_event,
1038 /* Socket operations. */
1039 static const struct proto_ops inet_seqpacket_ops = {
1041 .owner = THIS_MODULE,
1042 .release = inet_release, /* Needs to be wrapped... */
1044 .connect = sctp_inet_connect,
1045 .socketpair = sock_no_socketpair,
1046 .accept = inet_accept,
1047 .getname = inet_getname, /* Semantics are different. */
1049 .ioctl = inet_ioctl,
1050 .listen = sctp_inet_listen,
1051 .shutdown = inet_shutdown, /* Looks harmless. */
1052 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1053 .getsockopt = sock_common_getsockopt,
1054 .sendmsg = inet_sendmsg,
1055 .recvmsg = inet_recvmsg,
1056 .mmap = sock_no_mmap,
1057 .sendpage = sock_no_sendpage,
1058 #ifdef CONFIG_COMPAT
1059 .compat_setsockopt = compat_sock_common_setsockopt,
1060 .compat_getsockopt = compat_sock_common_getsockopt,
1064 /* Registration with AF_INET family. */
1065 static struct inet_protosw sctp_seqpacket_protosw = {
1066 .type = SOCK_SEQPACKET,
1067 .protocol = IPPROTO_SCTP,
1069 .ops = &inet_seqpacket_ops,
1070 .flags = SCTP_PROTOSW_FLAG
1072 static struct inet_protosw sctp_stream_protosw = {
1073 .type = SOCK_STREAM,
1074 .protocol = IPPROTO_SCTP,
1076 .ops = &inet_seqpacket_ops,
1077 .flags = SCTP_PROTOSW_FLAG
1080 /* Register with IP layer. */
1081 static const struct net_protocol sctp_protocol = {
1082 .handler = sctp_rcv,
1083 .err_handler = sctp_v4_err,
1086 .icmp_strict_tag_validation = 1,
1089 /* IPv4 address related functions. */
1090 static struct sctp_af sctp_af_inet = {
1091 .sa_family = AF_INET,
1092 .sctp_xmit = sctp_v4_xmit,
1093 .setsockopt = ip_setsockopt,
1094 .getsockopt = ip_getsockopt,
1095 .get_dst = sctp_v4_get_dst,
1096 .get_saddr = sctp_v4_get_saddr,
1097 .copy_addrlist = sctp_v4_copy_addrlist,
1098 .from_skb = sctp_v4_from_skb,
1099 .from_sk = sctp_v4_from_sk,
1100 .from_addr_param = sctp_v4_from_addr_param,
1101 .to_addr_param = sctp_v4_to_addr_param,
1102 .cmp_addr = sctp_v4_cmp_addr,
1103 .addr_valid = sctp_v4_addr_valid,
1104 .inaddr_any = sctp_v4_inaddr_any,
1105 .is_any = sctp_v4_is_any,
1106 .available = sctp_v4_available,
1107 .scope = sctp_v4_scope,
1108 .skb_iif = sctp_v4_skb_iif,
1109 .is_ce = sctp_v4_is_ce,
1110 .seq_dump_addr = sctp_v4_seq_dump_addr,
1111 .ecn_capable = sctp_v4_ecn_capable,
1112 .net_header_len = sizeof(struct iphdr),
1113 .sockaddr_len = sizeof(struct sockaddr_in),
1114 #ifdef CONFIG_COMPAT
1115 .compat_setsockopt = compat_ip_setsockopt,
1116 .compat_getsockopt = compat_ip_getsockopt,
1120 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1124 return sctp_pf_inet_specific;
1126 return sctp_pf_inet6_specific;
1132 /* Register the PF specific function table. */
1133 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1137 if (sctp_pf_inet_specific)
1139 sctp_pf_inet_specific = pf;
1142 if (sctp_pf_inet6_specific)
1144 sctp_pf_inet6_specific = pf;
1152 static inline int init_sctp_mibs(struct net *net)
1154 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1155 if (!net->sctp.sctp_statistics)
1160 static inline void cleanup_sctp_mibs(struct net *net)
1162 free_percpu(net->sctp.sctp_statistics);
1165 static void sctp_v4_pf_init(void)
1167 /* Initialize the SCTP specific PF functions. */
1168 sctp_register_pf(&sctp_pf_inet, PF_INET);
1169 sctp_register_af(&sctp_af_inet);
1172 static void sctp_v4_pf_exit(void)
1174 list_del(&sctp_af_inet.list);
1177 static int sctp_v4_protosw_init(void)
1181 rc = proto_register(&sctp_prot, 1);
1185 /* Register SCTP(UDP and TCP style) with socket layer. */
1186 inet_register_protosw(&sctp_seqpacket_protosw);
1187 inet_register_protosw(&sctp_stream_protosw);
1192 static void sctp_v4_protosw_exit(void)
1194 inet_unregister_protosw(&sctp_stream_protosw);
1195 inet_unregister_protosw(&sctp_seqpacket_protosw);
1196 proto_unregister(&sctp_prot);
1199 static int sctp_v4_add_protocol(void)
1201 /* Register notifier for inet address additions/deletions. */
1202 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1204 /* Register SCTP with inet layer. */
1205 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1211 static void sctp_v4_del_protocol(void)
1213 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1214 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1217 static int __net_init sctp_defaults_init(struct net *net)
1222 * 14. Suggested SCTP Protocol Parameter Values
1224 /* The following protocol parameters are RECOMMENDED: */
1225 /* RTO.Initial - 3 seconds */
1226 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1227 /* RTO.Min - 1 second */
1228 net->sctp.rto_min = SCTP_RTO_MIN;
1229 /* RTO.Max - 60 seconds */
1230 net->sctp.rto_max = SCTP_RTO_MAX;
1231 /* RTO.Alpha - 1/8 */
1232 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1233 /* RTO.Beta - 1/4 */
1234 net->sctp.rto_beta = SCTP_RTO_BETA;
1236 /* Valid.Cookie.Life - 60 seconds */
1237 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1239 /* Whether Cookie Preservative is enabled(1) or not(0) */
1240 net->sctp.cookie_preserve_enable = 1;
1242 /* Default sctp sockets to use md5 as their hmac alg */
1243 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1244 net->sctp.sctp_hmac_alg = "md5";
1245 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1246 net->sctp.sctp_hmac_alg = "sha1";
1248 net->sctp.sctp_hmac_alg = NULL;
1252 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1254 /* Enable pf state by default */
1255 net->sctp.pf_enable = 1;
1257 /* Association.Max.Retrans - 10 attempts
1258 * Path.Max.Retrans - 5 attempts (per destination address)
1259 * Max.Init.Retransmits - 8 attempts
1261 net->sctp.max_retrans_association = 10;
1262 net->sctp.max_retrans_path = 5;
1263 net->sctp.max_retrans_init = 8;
1265 /* Sendbuffer growth - do per-socket accounting */
1266 net->sctp.sndbuf_policy = 0;
1268 /* Rcvbuffer growth - do per-socket accounting */
1269 net->sctp.rcvbuf_policy = 0;
1271 /* HB.interval - 30 seconds */
1272 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1274 /* delayed SACK timeout */
1275 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1277 /* Disable ADDIP by default. */
1278 net->sctp.addip_enable = 0;
1279 net->sctp.addip_noauth = 0;
1280 net->sctp.default_auto_asconf = 0;
1282 /* Enable PR-SCTP by default. */
1283 net->sctp.prsctp_enable = 1;
1285 /* Disable RECONF by default. */
1286 net->sctp.reconf_enable = 0;
1288 /* Disable AUTH by default. */
1289 net->sctp.auth_enable = 0;
1291 /* Set SCOPE policy to enabled */
1292 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1294 /* Set the default rwnd update threshold */
1295 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1297 /* Initialize maximum autoclose timeout. */
1298 net->sctp.max_autoclose = INT_MAX / HZ;
1300 status = sctp_sysctl_net_register(net);
1302 goto err_sysctl_register;
1304 /* Allocate and initialise sctp mibs. */
1305 status = init_sctp_mibs(net);
1309 /* Initialize proc fs directory. */
1310 status = sctp_proc_init(net);
1314 sctp_dbg_objcnt_init(net);
1316 /* Initialize the local address list. */
1317 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1318 spin_lock_init(&net->sctp.local_addr_lock);
1319 sctp_get_local_addr_list(net);
1321 /* Initialize the address event list */
1322 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1323 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1324 spin_lock_init(&net->sctp.addr_wq_lock);
1325 net->sctp.addr_wq_timer.expires = 0;
1326 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1327 (unsigned long)net);
1332 cleanup_sctp_mibs(net);
1334 sctp_sysctl_net_unregister(net);
1335 err_sysctl_register:
1339 static void __net_exit sctp_defaults_exit(struct net *net)
1341 /* Free the local address list */
1342 sctp_free_addr_wq(net);
1343 sctp_free_local_addr_list(net);
1345 sctp_dbg_objcnt_exit(net);
1347 sctp_proc_exit(net);
1348 cleanup_sctp_mibs(net);
1349 sctp_sysctl_net_unregister(net);
1352 static struct pernet_operations sctp_defaults_ops = {
1353 .init = sctp_defaults_init,
1354 .exit = sctp_defaults_exit,
1357 static int __net_init sctp_ctrlsock_init(struct net *net)
1361 /* Initialize the control inode/socket for handling OOTB packets. */
1362 status = sctp_ctl_sock_init(net);
1364 pr_err("Failed to initialize the SCTP control sock\n");
1369 static void __net_exit sctp_ctrlsock_exit(struct net *net)
1371 /* Free the control endpoint. */
1372 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1375 static struct pernet_operations sctp_ctrlsock_ops = {
1376 .init = sctp_ctrlsock_init,
1377 .exit = sctp_ctrlsock_exit,
1380 /* Initialize the universe into something sensible. */
1381 static __init int sctp_init(void)
1384 int status = -EINVAL;
1386 unsigned long limit;
1390 int max_entry_order;
1392 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1394 /* Allocate bind_bucket and chunk caches. */
1396 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1397 sizeof(struct sctp_bind_bucket),
1398 0, SLAB_HWCACHE_ALIGN,
1400 if (!sctp_bucket_cachep)
1403 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1404 sizeof(struct sctp_chunk),
1405 0, SLAB_HWCACHE_ALIGN,
1407 if (!sctp_chunk_cachep)
1408 goto err_chunk_cachep;
1410 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1412 goto err_percpu_counter_init;
1414 /* Implementation specific variables. */
1416 /* Initialize default stream count setup information. */
1417 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1418 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1420 /* Initialize handle used for association ids. */
1421 idr_init(&sctp_assocs_id);
1423 limit = nr_free_buffer_pages() / 8;
1424 limit = max(limit, 128UL);
1425 sysctl_sctp_mem[0] = limit / 4 * 3;
1426 sysctl_sctp_mem[1] = limit;
1427 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1429 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1430 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1431 max_share = min(4UL*1024*1024, limit);
1433 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1434 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1435 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1437 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1438 sysctl_sctp_wmem[1] = 16*1024;
1439 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1441 /* Size and allocate the association hash table.
1442 * The methodology is similar to that of the tcp hash tables.
1443 * Though not identical. Start by getting a goal size
1445 if (totalram_pages >= (128 * 1024))
1446 goal = totalram_pages >> (22 - PAGE_SHIFT);
1448 goal = totalram_pages >> (24 - PAGE_SHIFT);
1450 /* Then compute the page order for said goal */
1451 order = get_order(goal);
1453 /* Now compute the required page order for the maximum sized table we
1456 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1457 sizeof(struct sctp_bind_hashbucket));
1459 /* Limit the page order by that maximum hash table size */
1460 order = min(order, max_entry_order);
1462 /* Allocate and initialize the endpoint hash table. */
1463 sctp_ep_hashsize = 64;
1465 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1466 if (!sctp_ep_hashtable) {
1467 pr_err("Failed endpoint_hash alloc\n");
1469 goto err_ehash_alloc;
1471 for (i = 0; i < sctp_ep_hashsize; i++) {
1472 rwlock_init(&sctp_ep_hashtable[i].lock);
1473 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1476 /* Allocate and initialize the SCTP port hash table.
1477 * Note that order is initalized to start at the max sized
1478 * table we want to support. If we can't get that many pages
1479 * reduce the order and try again
1482 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1483 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1484 } while (!sctp_port_hashtable && --order > 0);
1486 if (!sctp_port_hashtable) {
1487 pr_err("Failed bind hash alloc\n");
1489 goto err_bhash_alloc;
1492 /* Now compute the number of entries that will fit in the
1493 * port hash space we allocated
1495 num_entries = (1UL << order) * PAGE_SIZE /
1496 sizeof(struct sctp_bind_hashbucket);
1498 /* And finish by rounding it down to the nearest power of two
1499 * this wastes some memory of course, but its needed because
1500 * the hash function operates based on the assumption that
1501 * that the number of entries is a power of two
1503 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1505 for (i = 0; i < sctp_port_hashsize; i++) {
1506 spin_lock_init(&sctp_port_hashtable[i].lock);
1507 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1510 status = sctp_transport_hashtable_init();
1512 goto err_thash_alloc;
1514 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1517 sctp_sysctl_register();
1519 INIT_LIST_HEAD(&sctp_address_families);
1523 status = register_pernet_subsys(&sctp_defaults_ops);
1525 goto err_register_defaults;
1527 status = sctp_v4_protosw_init();
1529 goto err_protosw_init;
1531 status = sctp_v6_protosw_init();
1533 goto err_v6_protosw_init;
1535 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1537 goto err_register_ctrlsock;
1539 status = sctp_v4_add_protocol();
1541 goto err_add_protocol;
1543 /* Register SCTP with inet6 layer. */
1544 status = sctp_v6_add_protocol();
1546 goto err_v6_add_protocol;
1548 if (sctp_offload_init() < 0)
1549 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1553 err_v6_add_protocol:
1554 sctp_v4_del_protocol();
1556 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1557 err_register_ctrlsock:
1558 sctp_v6_protosw_exit();
1559 err_v6_protosw_init:
1560 sctp_v4_protosw_exit();
1562 unregister_pernet_subsys(&sctp_defaults_ops);
1563 err_register_defaults:
1566 sctp_sysctl_unregister();
1567 free_pages((unsigned long)sctp_port_hashtable,
1568 get_order(sctp_port_hashsize *
1569 sizeof(struct sctp_bind_hashbucket)));
1571 sctp_transport_hashtable_destroy();
1573 kfree(sctp_ep_hashtable);
1575 percpu_counter_destroy(&sctp_sockets_allocated);
1576 err_percpu_counter_init:
1577 kmem_cache_destroy(sctp_chunk_cachep);
1579 kmem_cache_destroy(sctp_bucket_cachep);
1583 /* Exit handler for the SCTP protocol. */
1584 static __exit void sctp_exit(void)
1586 /* BUG. This should probably do something useful like clean
1587 * up all the remaining associations and all that memory.
1590 /* Unregister with inet6/inet layers. */
1591 sctp_v6_del_protocol();
1592 sctp_v4_del_protocol();
1594 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1596 /* Free protosw registrations */
1597 sctp_v6_protosw_exit();
1598 sctp_v4_protosw_exit();
1600 unregister_pernet_subsys(&sctp_defaults_ops);
1602 /* Unregister with socket layer. */
1606 sctp_sysctl_unregister();
1608 free_pages((unsigned long)sctp_port_hashtable,
1609 get_order(sctp_port_hashsize *
1610 sizeof(struct sctp_bind_hashbucket)));
1611 kfree(sctp_ep_hashtable);
1612 sctp_transport_hashtable_destroy();
1614 percpu_counter_destroy(&sctp_sockets_allocated);
1616 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1618 kmem_cache_destroy(sctp_chunk_cachep);
1619 kmem_cache_destroy(sctp_bucket_cachep);
1622 module_init(sctp_init);
1623 module_exit(sctp_exit);
1626 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1628 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1629 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1630 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1631 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1632 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1633 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1634 MODULE_LICENSE("GPL");