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_port = 0;
155 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
157 INIT_LIST_HEAD(&addr->list);
158 list_add_tail(&addr->list, addrlist);
165 /* Extract our IP addresses from the system and stash them in the
166 * protocol structure.
168 static void sctp_get_local_addr_list(struct net *net)
170 struct net_device *dev;
171 struct list_head *pos;
175 for_each_netdev_rcu(net, dev) {
176 list_for_each(pos, &sctp_address_families) {
177 af = list_entry(pos, struct sctp_af, list);
178 af->copy_addrlist(&net->sctp.local_addr_list, dev);
184 /* Free the existing local addresses. */
185 static void sctp_free_local_addr_list(struct net *net)
187 struct sctp_sockaddr_entry *addr;
188 struct list_head *pos, *temp;
190 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
191 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
197 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
198 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
199 sctp_scope_t scope, gfp_t gfp, int copy_flags)
201 struct sctp_sockaddr_entry *addr;
205 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
208 if (sctp_in_scope(net, &addr->a, scope)) {
209 /* Now that the address is in scope, check to see if
210 * the address type is really supported by the local
211 * sock as well as the remote peer.
213 if ((((AF_INET == addr->a.sa.sa_family) &&
214 (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
215 (((AF_INET6 == addr->a.sa.sa_family) &&
216 (copy_flags & SCTP_ADDR6_ALLOWED) &&
217 (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
218 error = sctp_add_bind_addr(bp, &addr->a,
219 SCTP_ADDR_SRC, GFP_ATOMIC);
231 /* Initialize a sctp_addr from in incoming skb. */
232 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
239 port = &addr->v4.sin_port;
240 addr->v4.sin_family = AF_INET;
245 from = &ip_hdr(skb)->saddr;
248 from = &ip_hdr(skb)->daddr;
250 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
253 /* Initialize an sctp_addr from a socket. */
254 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
256 addr->v4.sin_family = AF_INET;
257 addr->v4.sin_port = 0;
258 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
261 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
262 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
264 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
267 /* Initialize sk->sk_daddr from sctp_addr. */
268 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
270 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
273 /* Initialize a sctp_addr from an address parameter. */
274 static void sctp_v4_from_addr_param(union sctp_addr *addr,
275 union sctp_addr_param *param,
276 __be16 port, int iif)
278 addr->v4.sin_family = AF_INET;
279 addr->v4.sin_port = port;
280 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
283 /* Initialize an address parameter from a sctp_addr and return the length
284 * of the address parameter.
286 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
287 union sctp_addr_param *param)
289 int length = sizeof(sctp_ipv4addr_param_t);
291 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
292 param->v4.param_hdr.length = htons(length);
293 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
298 /* Initialize a sctp_addr from a dst_entry. */
299 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
302 saddr->v4.sin_family = AF_INET;
303 saddr->v4.sin_port = port;
304 saddr->v4.sin_addr.s_addr = fl4->saddr;
307 /* Compare two addresses exactly. */
308 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
309 const union sctp_addr *addr2)
311 if (addr1->sa.sa_family != addr2->sa.sa_family)
313 if (addr1->v4.sin_port != addr2->v4.sin_port)
315 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
321 /* Initialize addr struct to INADDR_ANY. */
322 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
324 addr->v4.sin_family = AF_INET;
325 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
326 addr->v4.sin_port = port;
329 /* Is this a wildcard address? */
330 static int sctp_v4_is_any(const union sctp_addr *addr)
332 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
335 /* This function checks if the address is a valid address to be used for
339 * Return 0 - If the address is a non-unicast or an illegal address.
340 * Return 1 - If the address is a unicast.
342 static int sctp_v4_addr_valid(union sctp_addr *addr,
343 struct sctp_sock *sp,
344 const struct sk_buff *skb)
346 /* IPv4 addresses not allowed */
347 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
350 /* Is this a non-unicast address or a unusable SCTP address? */
351 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
354 /* Is this a broadcast address? */
355 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
361 /* Should this be available for binding? */
362 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
364 struct net *net = sock_net(&sp->inet.sk);
365 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
368 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
370 !sp->inet.freebind &&
371 !net->ipv4.sysctl_ip_nonlocal_bind)
374 if (ipv6_only_sock(sctp_opt2sk(sp)))
380 /* Checking the loopback, private and other address scopes as defined in
381 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
382 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
384 * Level 0 - unusable SCTP addresses
385 * Level 1 - loopback address
386 * Level 2 - link-local addresses
387 * Level 3 - private addresses.
388 * Level 4 - global addresses
389 * For INIT and INIT-ACK address list, let L be the level of
390 * of requested destination address, sender and receiver
391 * SHOULD include all of its addresses with level greater
392 * than or equal to L.
394 * IPv4 scoping can be controlled through sysctl option
395 * net.sctp.addr_scope_policy
397 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
401 /* Check for unusable SCTP addresses. */
402 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
403 retval = SCTP_SCOPE_UNUSABLE;
404 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
405 retval = SCTP_SCOPE_LOOPBACK;
406 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
407 retval = SCTP_SCOPE_LINK;
408 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
409 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
410 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
411 retval = SCTP_SCOPE_PRIVATE;
413 retval = SCTP_SCOPE_GLOBAL;
419 /* Returns a valid dst cache entry for the given source and destination ip
420 * addresses. If an association is passed, trys to get a dst entry with a
421 * source address that matches an address in the bind address list.
423 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
424 struct flowi *fl, struct sock *sk)
426 struct sctp_association *asoc = t->asoc;
428 struct flowi4 *fl4 = &fl->u.ip4;
429 struct sctp_bind_addr *bp;
430 struct sctp_sockaddr_entry *laddr;
431 struct dst_entry *dst = NULL;
432 union sctp_addr *daddr = &t->ipaddr;
433 union sctp_addr dst_saddr;
435 memset(fl4, 0x0, sizeof(struct flowi4));
436 fl4->daddr = daddr->v4.sin_addr.s_addr;
437 fl4->fl4_dport = daddr->v4.sin_port;
438 fl4->flowi4_proto = IPPROTO_SCTP;
440 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
441 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
442 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
445 fl4->saddr = saddr->v4.sin_addr.s_addr;
446 fl4->fl4_sport = saddr->v4.sin_port;
449 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
452 rt = ip_route_output_key(sock_net(sk), fl4);
456 /* If there is no association or if a source address is passed, no
457 * more validation is required.
462 bp = &asoc->base.bind_addr;
465 /* Walk through the bind address list and look for a bind
466 * address that matches the source address of the returned dst.
468 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
470 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
471 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
472 (laddr->state != SCTP_ADDR_SRC &&
473 !asoc->src_out_of_asoc_ok))
475 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
480 /* None of the bound addresses match the source address of the
481 * dst. So release it.
487 /* Walk through the bind address list and try to get a dst that
488 * matches a bind address as the source address.
491 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
492 struct net_device *odev;
496 if (laddr->state != SCTP_ADDR_SRC ||
497 AF_INET != laddr->a.sa.sa_family)
500 fl4->fl4_sport = laddr->a.v4.sin_port;
501 flowi4_update_output(fl4,
502 asoc->base.sk->sk_bound_dev_if,
503 RT_CONN_FLAGS(asoc->base.sk),
504 daddr->v4.sin_addr.s_addr,
505 laddr->a.v4.sin_addr.s_addr);
507 rt = ip_route_output_key(sock_net(sk), fl4);
514 /* Ensure the src address belongs to the output
517 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
519 if (!odev || odev->ifindex != fl4->flowi4_oif) {
521 dst_release(&rt->dst);
536 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
537 &fl4->daddr, &fl4->saddr);
539 pr_debug("no route\n");
542 /* For v4, the source address is cached in the route entry(dst). So no need
543 * to cache it separately and hence this is an empty routine.
545 static void sctp_v4_get_saddr(struct sctp_sock *sk,
546 struct sctp_transport *t,
549 union sctp_addr *saddr = &t->saddr;
550 struct rtable *rt = (struct rtable *)t->dst;
553 saddr->v4.sin_family = AF_INET;
554 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
558 /* What interface did this skb arrive on? */
559 static int sctp_v4_skb_iif(const struct sk_buff *skb)
561 return inet_iif(skb);
564 /* Was this packet marked by Explicit Congestion Notification? */
565 static int sctp_v4_is_ce(const struct sk_buff *skb)
567 return INET_ECN_is_ce(ip_hdr(skb)->tos);
570 /* Create and initialize a new sk for the socket returned by accept(). */
571 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
572 struct sctp_association *asoc)
574 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
576 struct inet_sock *newinet;
581 sock_init_data(NULL, newsk);
583 sctp_copy_sock(newsk, sk, asoc);
584 sock_reset_flag(newsk, SOCK_ZAPPED);
586 newinet = inet_sk(newsk);
588 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
590 sk_refcnt_debug_inc(newsk);
592 if (newsk->sk_prot->init(newsk)) {
593 sk_common_release(newsk);
601 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
603 /* No address mapping for V4 sockets */
604 return sizeof(struct sockaddr_in);
607 /* Dump the v4 addr to the seq file. */
608 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
610 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
613 static void sctp_v4_ecn_capable(struct sock *sk)
618 static void sctp_addr_wq_timeout_handler(unsigned long arg)
620 struct net *net = (struct net *)arg;
621 struct sctp_sockaddr_entry *addrw, *temp;
622 struct sctp_sock *sp;
624 spin_lock_bh(&net->sctp.addr_wq_lock);
626 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
627 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
628 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
629 addrw->state, addrw);
631 #if IS_ENABLED(CONFIG_IPV6)
632 /* Now we send an ASCONF for each association */
633 /* Note. we currently don't handle link local IPv6 addressees */
634 if (addrw->a.sa.sa_family == AF_INET6) {
635 struct in6_addr *in6;
637 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
641 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
642 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
643 addrw->state == SCTP_ADDR_NEW) {
644 unsigned long timeo_val;
646 pr_debug("%s: this is on DAD, trying %d sec "
648 SCTP_ADDRESS_TICK_DELAY);
651 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
652 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
657 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
660 sk = sctp_opt2sk(sp);
661 /* ignore bound-specific endpoints */
662 if (!sctp_is_ep_boundall(sk))
665 if (sctp_asconf_mgmt(sp, addrw) < 0)
666 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
669 #if IS_ENABLED(CONFIG_IPV6)
672 list_del(&addrw->list);
675 spin_unlock_bh(&net->sctp.addr_wq_lock);
678 static void sctp_free_addr_wq(struct net *net)
680 struct sctp_sockaddr_entry *addrw;
681 struct sctp_sockaddr_entry *temp;
683 spin_lock_bh(&net->sctp.addr_wq_lock);
684 del_timer(&net->sctp.addr_wq_timer);
685 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
686 list_del(&addrw->list);
689 spin_unlock_bh(&net->sctp.addr_wq_lock);
692 /* lookup the entry for the same address in the addr_waitq
693 * sctp_addr_wq MUST be locked
695 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
696 struct sctp_sockaddr_entry *addr)
698 struct sctp_sockaddr_entry *addrw;
700 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
701 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
703 if (addrw->a.sa.sa_family == AF_INET) {
704 if (addrw->a.v4.sin_addr.s_addr ==
705 addr->a.v4.sin_addr.s_addr)
707 } else if (addrw->a.sa.sa_family == AF_INET6) {
708 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
709 &addr->a.v6.sin6_addr))
716 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
718 struct sctp_sockaddr_entry *addrw;
719 unsigned long timeo_val;
721 /* first, we check if an opposite message already exist in the queue.
722 * If we found such message, it is removed.
723 * This operation is a bit stupid, but the DHCP client attaches the
724 * new address after a couple of addition and deletion of that address
727 spin_lock_bh(&net->sctp.addr_wq_lock);
728 /* Offsets existing events in addr_wq */
729 addrw = sctp_addr_wq_lookup(net, addr);
731 if (addrw->state != cmd) {
732 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
733 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
734 &net->sctp.addr_waitq);
736 list_del(&addrw->list);
739 spin_unlock_bh(&net->sctp.addr_wq_lock);
743 /* OK, we have to add the new address to the wait queue */
744 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
746 spin_unlock_bh(&net->sctp.addr_wq_lock);
750 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
752 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
753 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
755 if (!timer_pending(&net->sctp.addr_wq_timer)) {
757 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
758 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
760 spin_unlock_bh(&net->sctp.addr_wq_lock);
763 /* Event handler for inet address addition/deletion events.
764 * The sctp_local_addr_list needs to be protocted by a spin lock since
765 * multiple notifiers (say IPv4 and IPv6) may be running at the same
766 * time and thus corrupt the list.
767 * The reader side is protected with RCU.
769 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
772 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
773 struct sctp_sockaddr_entry *addr = NULL;
774 struct sctp_sockaddr_entry *temp;
775 struct net *net = dev_net(ifa->ifa_dev->dev);
780 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
782 addr->a.v4.sin_family = AF_INET;
783 addr->a.v4.sin_port = 0;
784 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
786 spin_lock_bh(&net->sctp.local_addr_lock);
787 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
788 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
789 spin_unlock_bh(&net->sctp.local_addr_lock);
793 spin_lock_bh(&net->sctp.local_addr_lock);
794 list_for_each_entry_safe(addr, temp,
795 &net->sctp.local_addr_list, list) {
796 if (addr->a.sa.sa_family == AF_INET &&
797 addr->a.v4.sin_addr.s_addr ==
799 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
802 list_del_rcu(&addr->list);
806 spin_unlock_bh(&net->sctp.local_addr_lock);
808 kfree_rcu(addr, rcu);
816 * Initialize the control inode/socket with a control endpoint data
817 * structure. This endpoint is reserved exclusively for the OOTB processing.
819 static int sctp_ctl_sock_init(struct net *net)
822 sa_family_t family = PF_INET;
824 if (sctp_get_pf_specific(PF_INET6))
827 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
828 SOCK_SEQPACKET, IPPROTO_SCTP, net);
830 /* If IPv6 socket could not be created, try the IPv4 socket */
831 if (err < 0 && family == PF_INET6)
832 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
833 SOCK_SEQPACKET, IPPROTO_SCTP,
837 pr_err("Failed to create the SCTP control socket\n");
843 /* Register address family specific functions. */
844 int sctp_register_af(struct sctp_af *af)
846 switch (af->sa_family) {
848 if (sctp_af_v4_specific)
850 sctp_af_v4_specific = af;
853 if (sctp_af_v6_specific)
855 sctp_af_v6_specific = af;
861 INIT_LIST_HEAD(&af->list);
862 list_add_tail(&af->list, &sctp_address_families);
866 /* Get the table of functions for manipulating a particular address
869 struct sctp_af *sctp_get_af_specific(sa_family_t family)
873 return sctp_af_v4_specific;
875 return sctp_af_v6_specific;
881 /* Common code to initialize a AF_INET msg_name. */
882 static void sctp_inet_msgname(char *msgname, int *addr_len)
884 struct sockaddr_in *sin;
886 sin = (struct sockaddr_in *)msgname;
887 *addr_len = sizeof(struct sockaddr_in);
888 sin->sin_family = AF_INET;
889 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
892 /* Copy the primary address of the peer primary address as the msg_name. */
893 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
896 struct sockaddr_in *sin, *sinfrom;
899 struct sctp_association *asoc;
902 sctp_inet_msgname(msgname, addr_len);
903 sin = (struct sockaddr_in *)msgname;
904 sinfrom = &asoc->peer.primary_addr.v4;
905 sin->sin_port = htons(asoc->peer.port);
906 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
910 /* Initialize and copy out a msgname from an inbound skb. */
911 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
914 struct sctphdr *sh = sctp_hdr(skb);
915 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
917 sctp_inet_msgname(msgname, len);
918 sin->sin_port = sh->source;
919 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
923 /* Do we support this AF? */
924 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
926 /* PF_INET only supports AF_INET addresses. */
927 return AF_INET == family;
930 /* Address matching with wildcards allowed. */
931 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
932 const union sctp_addr *addr2,
933 struct sctp_sock *opt)
935 /* PF_INET only supports AF_INET addresses. */
936 if (addr1->sa.sa_family != addr2->sa.sa_family)
938 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
939 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
941 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
947 /* Verify that provided sockaddr looks bindable. Common verification has
948 * already been taken care of.
950 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
952 return sctp_v4_available(addr, opt);
955 /* Verify that sockaddr looks sendable. Common verification has already
956 * been taken care of.
958 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
963 /* Fill in Supported Address Type information for INIT and INIT-ACK
964 * chunks. Returns number of addresses supported.
966 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
969 types[0] = SCTP_PARAM_IPV4_ADDRESS;
973 /* Wrapper routine that calls the ip transmit routine. */
974 static inline int sctp_v4_xmit(struct sk_buff *skb,
975 struct sctp_transport *transport)
977 struct inet_sock *inet = inet_sk(skb->sk);
979 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
980 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr);
982 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
983 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
985 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
987 return ip_queue_xmit(&inet->sk, skb, &transport->fl);
990 static struct sctp_af sctp_af_inet;
992 static struct sctp_pf sctp_pf_inet = {
993 .event_msgname = sctp_inet_event_msgname,
994 .skb_msgname = sctp_inet_skb_msgname,
995 .af_supported = sctp_inet_af_supported,
996 .cmp_addr = sctp_inet_cmp_addr,
997 .bind_verify = sctp_inet_bind_verify,
998 .send_verify = sctp_inet_send_verify,
999 .supported_addrs = sctp_inet_supported_addrs,
1000 .create_accept_sk = sctp_v4_create_accept_sk,
1001 .addr_to_user = sctp_v4_addr_to_user,
1002 .to_sk_saddr = sctp_v4_to_sk_saddr,
1003 .to_sk_daddr = sctp_v4_to_sk_daddr,
1007 /* Notifier for inetaddr addition/deletion events. */
1008 static struct notifier_block sctp_inetaddr_notifier = {
1009 .notifier_call = sctp_inetaddr_event,
1012 /* Socket operations. */
1013 static const struct proto_ops inet_seqpacket_ops = {
1015 .owner = THIS_MODULE,
1016 .release = inet_release, /* Needs to be wrapped... */
1018 .connect = inet_dgram_connect,
1019 .socketpair = sock_no_socketpair,
1020 .accept = inet_accept,
1021 .getname = inet_getname, /* Semantics are different. */
1023 .ioctl = inet_ioctl,
1024 .listen = sctp_inet_listen,
1025 .shutdown = inet_shutdown, /* Looks harmless. */
1026 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1027 .getsockopt = sock_common_getsockopt,
1028 .sendmsg = inet_sendmsg,
1029 .recvmsg = sock_common_recvmsg,
1030 .mmap = sock_no_mmap,
1031 .sendpage = sock_no_sendpage,
1032 #ifdef CONFIG_COMPAT
1033 .compat_setsockopt = compat_sock_common_setsockopt,
1034 .compat_getsockopt = compat_sock_common_getsockopt,
1038 /* Registration with AF_INET family. */
1039 static struct inet_protosw sctp_seqpacket_protosw = {
1040 .type = SOCK_SEQPACKET,
1041 .protocol = IPPROTO_SCTP,
1043 .ops = &inet_seqpacket_ops,
1044 .flags = SCTP_PROTOSW_FLAG
1046 static struct inet_protosw sctp_stream_protosw = {
1047 .type = SOCK_STREAM,
1048 .protocol = IPPROTO_SCTP,
1050 .ops = &inet_seqpacket_ops,
1051 .flags = SCTP_PROTOSW_FLAG
1054 /* Register with IP layer. */
1055 static const struct net_protocol sctp_protocol = {
1056 .handler = sctp_rcv,
1057 .err_handler = sctp_v4_err,
1060 .icmp_strict_tag_validation = 1,
1063 /* IPv4 address related functions. */
1064 static struct sctp_af sctp_af_inet = {
1065 .sa_family = AF_INET,
1066 .sctp_xmit = sctp_v4_xmit,
1067 .setsockopt = ip_setsockopt,
1068 .getsockopt = ip_getsockopt,
1069 .get_dst = sctp_v4_get_dst,
1070 .get_saddr = sctp_v4_get_saddr,
1071 .copy_addrlist = sctp_v4_copy_addrlist,
1072 .from_skb = sctp_v4_from_skb,
1073 .from_sk = sctp_v4_from_sk,
1074 .from_addr_param = sctp_v4_from_addr_param,
1075 .to_addr_param = sctp_v4_to_addr_param,
1076 .cmp_addr = sctp_v4_cmp_addr,
1077 .addr_valid = sctp_v4_addr_valid,
1078 .inaddr_any = sctp_v4_inaddr_any,
1079 .is_any = sctp_v4_is_any,
1080 .available = sctp_v4_available,
1081 .scope = sctp_v4_scope,
1082 .skb_iif = sctp_v4_skb_iif,
1083 .is_ce = sctp_v4_is_ce,
1084 .seq_dump_addr = sctp_v4_seq_dump_addr,
1085 .ecn_capable = sctp_v4_ecn_capable,
1086 .net_header_len = sizeof(struct iphdr),
1087 .sockaddr_len = sizeof(struct sockaddr_in),
1088 #ifdef CONFIG_COMPAT
1089 .compat_setsockopt = compat_ip_setsockopt,
1090 .compat_getsockopt = compat_ip_getsockopt,
1094 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1098 return sctp_pf_inet_specific;
1100 return sctp_pf_inet6_specific;
1106 /* Register the PF specific function table. */
1107 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1111 if (sctp_pf_inet_specific)
1113 sctp_pf_inet_specific = pf;
1116 if (sctp_pf_inet6_specific)
1118 sctp_pf_inet6_specific = pf;
1126 static inline int init_sctp_mibs(struct net *net)
1128 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1129 if (!net->sctp.sctp_statistics)
1134 static inline void cleanup_sctp_mibs(struct net *net)
1136 free_percpu(net->sctp.sctp_statistics);
1139 static void sctp_v4_pf_init(void)
1141 /* Initialize the SCTP specific PF functions. */
1142 sctp_register_pf(&sctp_pf_inet, PF_INET);
1143 sctp_register_af(&sctp_af_inet);
1146 static void sctp_v4_pf_exit(void)
1148 list_del(&sctp_af_inet.list);
1151 static int sctp_v4_protosw_init(void)
1155 rc = proto_register(&sctp_prot, 1);
1159 /* Register SCTP(UDP and TCP style) with socket layer. */
1160 inet_register_protosw(&sctp_seqpacket_protosw);
1161 inet_register_protosw(&sctp_stream_protosw);
1166 static void sctp_v4_protosw_exit(void)
1168 inet_unregister_protosw(&sctp_stream_protosw);
1169 inet_unregister_protosw(&sctp_seqpacket_protosw);
1170 proto_unregister(&sctp_prot);
1173 static int sctp_v4_add_protocol(void)
1175 /* Register notifier for inet address additions/deletions. */
1176 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1178 /* Register SCTP with inet layer. */
1179 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1185 static void sctp_v4_del_protocol(void)
1187 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1188 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1191 static int __net_init sctp_defaults_init(struct net *net)
1196 * 14. Suggested SCTP Protocol Parameter Values
1198 /* The following protocol parameters are RECOMMENDED: */
1199 /* RTO.Initial - 3 seconds */
1200 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1201 /* RTO.Min - 1 second */
1202 net->sctp.rto_min = SCTP_RTO_MIN;
1203 /* RTO.Max - 60 seconds */
1204 net->sctp.rto_max = SCTP_RTO_MAX;
1205 /* RTO.Alpha - 1/8 */
1206 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1207 /* RTO.Beta - 1/4 */
1208 net->sctp.rto_beta = SCTP_RTO_BETA;
1210 /* Valid.Cookie.Life - 60 seconds */
1211 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1213 /* Whether Cookie Preservative is enabled(1) or not(0) */
1214 net->sctp.cookie_preserve_enable = 1;
1216 /* Default sctp sockets to use md5 as their hmac alg */
1217 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1218 net->sctp.sctp_hmac_alg = "md5";
1219 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1220 net->sctp.sctp_hmac_alg = "sha1";
1222 net->sctp.sctp_hmac_alg = NULL;
1226 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1228 /* Association.Max.Retrans - 10 attempts
1229 * Path.Max.Retrans - 5 attempts (per destination address)
1230 * Max.Init.Retransmits - 8 attempts
1232 net->sctp.max_retrans_association = 10;
1233 net->sctp.max_retrans_path = 5;
1234 net->sctp.max_retrans_init = 8;
1236 /* Sendbuffer growth - do per-socket accounting */
1237 net->sctp.sndbuf_policy = 0;
1239 /* Rcvbuffer growth - do per-socket accounting */
1240 net->sctp.rcvbuf_policy = 0;
1242 /* HB.interval - 30 seconds */
1243 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1245 /* delayed SACK timeout */
1246 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1248 /* Disable ADDIP by default. */
1249 net->sctp.addip_enable = 0;
1250 net->sctp.addip_noauth = 0;
1251 net->sctp.default_auto_asconf = 0;
1253 /* Enable PR-SCTP by default. */
1254 net->sctp.prsctp_enable = 1;
1256 /* Disable AUTH by default. */
1257 net->sctp.auth_enable = 0;
1259 /* Set SCOPE policy to enabled */
1260 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1262 /* Set the default rwnd update threshold */
1263 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1265 /* Initialize maximum autoclose timeout. */
1266 net->sctp.max_autoclose = INT_MAX / HZ;
1268 status = sctp_sysctl_net_register(net);
1270 goto err_sysctl_register;
1272 /* Allocate and initialise sctp mibs. */
1273 status = init_sctp_mibs(net);
1277 /* Initialize proc fs directory. */
1278 status = sctp_proc_init(net);
1282 sctp_dbg_objcnt_init(net);
1284 /* Initialize the local address list. */
1285 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1286 spin_lock_init(&net->sctp.local_addr_lock);
1287 sctp_get_local_addr_list(net);
1289 /* Initialize the address event list */
1290 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1291 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1292 spin_lock_init(&net->sctp.addr_wq_lock);
1293 net->sctp.addr_wq_timer.expires = 0;
1294 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1295 (unsigned long)net);
1300 cleanup_sctp_mibs(net);
1302 sctp_sysctl_net_unregister(net);
1303 err_sysctl_register:
1307 static void __net_exit sctp_defaults_exit(struct net *net)
1309 /* Free the local address list */
1310 sctp_free_addr_wq(net);
1311 sctp_free_local_addr_list(net);
1313 sctp_dbg_objcnt_exit(net);
1315 sctp_proc_exit(net);
1316 cleanup_sctp_mibs(net);
1317 sctp_sysctl_net_unregister(net);
1320 static struct pernet_operations sctp_defaults_ops = {
1321 .init = sctp_defaults_init,
1322 .exit = sctp_defaults_exit,
1325 static int __net_init sctp_ctrlsock_init(struct net *net)
1329 /* Initialize the control inode/socket for handling OOTB packets. */
1330 status = sctp_ctl_sock_init(net);
1332 pr_err("Failed to initialize the SCTP control sock\n");
1337 static void __net_init sctp_ctrlsock_exit(struct net *net)
1339 /* Free the control endpoint. */
1340 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1343 static struct pernet_operations sctp_ctrlsock_ops = {
1344 .init = sctp_ctrlsock_init,
1345 .exit = sctp_ctrlsock_exit,
1348 /* Initialize the universe into something sensible. */
1349 static __init int sctp_init(void)
1352 int status = -EINVAL;
1354 unsigned long limit;
1358 int max_entry_order;
1360 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1362 /* Allocate bind_bucket and chunk caches. */
1364 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1365 sizeof(struct sctp_bind_bucket),
1366 0, SLAB_HWCACHE_ALIGN,
1368 if (!sctp_bucket_cachep)
1371 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1372 sizeof(struct sctp_chunk),
1373 0, SLAB_HWCACHE_ALIGN,
1375 if (!sctp_chunk_cachep)
1376 goto err_chunk_cachep;
1378 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1380 goto err_percpu_counter_init;
1382 /* Implementation specific variables. */
1384 /* Initialize default stream count setup information. */
1385 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1386 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1388 /* Initialize handle used for association ids. */
1389 idr_init(&sctp_assocs_id);
1391 limit = nr_free_buffer_pages() / 8;
1392 limit = max(limit, 128UL);
1393 sysctl_sctp_mem[0] = limit / 4 * 3;
1394 sysctl_sctp_mem[1] = limit;
1395 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1397 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1398 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1399 max_share = min(4UL*1024*1024, limit);
1401 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1402 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1403 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1405 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1406 sysctl_sctp_wmem[1] = 16*1024;
1407 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1409 /* Size and allocate the association hash table.
1410 * The methodology is similar to that of the tcp hash tables.
1411 * Though not identical. Start by getting a goal size
1413 if (totalram_pages >= (128 * 1024))
1414 goal = totalram_pages >> (22 - PAGE_SHIFT);
1416 goal = totalram_pages >> (24 - PAGE_SHIFT);
1418 /* Then compute the page order for said goal */
1419 order = get_order(goal);
1421 /* Now compute the required page order for the maximum sized table we
1424 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1425 sizeof(struct sctp_bind_hashbucket));
1427 /* Limit the page order by that maximum hash table size */
1428 order = min(order, max_entry_order);
1431 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1432 sizeof(struct sctp_hashbucket);
1433 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1435 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1436 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1437 } while (!sctp_assoc_hashtable && --order > 0);
1438 if (!sctp_assoc_hashtable) {
1439 pr_err("Failed association hash alloc\n");
1441 goto err_ahash_alloc;
1443 for (i = 0; i < sctp_assoc_hashsize; i++) {
1444 rwlock_init(&sctp_assoc_hashtable[i].lock);
1445 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1448 /* Allocate and initialize the endpoint hash table. */
1449 sctp_ep_hashsize = 64;
1451 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1452 if (!sctp_ep_hashtable) {
1453 pr_err("Failed endpoint_hash alloc\n");
1455 goto err_ehash_alloc;
1457 for (i = 0; i < sctp_ep_hashsize; i++) {
1458 rwlock_init(&sctp_ep_hashtable[i].lock);
1459 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1462 /* Allocate and initialize the SCTP port hash table.
1463 * Note that order is initalized to start at the max sized
1464 * table we want to support. If we can't get that many pages
1465 * reduce the order and try again
1468 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1469 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1470 } while (!sctp_port_hashtable && --order > 0);
1472 if (!sctp_port_hashtable) {
1473 pr_err("Failed bind hash alloc\n");
1475 goto err_bhash_alloc;
1478 /* Now compute the number of entries that will fit in the
1479 * port hash space we allocated
1481 num_entries = (1UL << order) * PAGE_SIZE /
1482 sizeof(struct sctp_bind_hashbucket);
1484 /* And finish by rounding it down to the nearest power of two
1485 * this wastes some memory of course, but its needed because
1486 * the hash function operates based on the assumption that
1487 * that the number of entries is a power of two
1489 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1491 for (i = 0; i < sctp_port_hashsize; i++) {
1492 spin_lock_init(&sctp_port_hashtable[i].lock);
1493 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1496 pr_info("Hash tables configured (established %d bind %d)\n",
1497 sctp_assoc_hashsize, sctp_port_hashsize);
1499 sctp_sysctl_register();
1501 INIT_LIST_HEAD(&sctp_address_families);
1505 status = register_pernet_subsys(&sctp_defaults_ops);
1507 goto err_register_defaults;
1509 status = sctp_v4_protosw_init();
1511 goto err_protosw_init;
1513 status = sctp_v6_protosw_init();
1515 goto err_v6_protosw_init;
1517 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1519 goto err_register_ctrlsock;
1521 status = sctp_v4_add_protocol();
1523 goto err_add_protocol;
1525 /* Register SCTP with inet6 layer. */
1526 status = sctp_v6_add_protocol();
1528 goto err_v6_add_protocol;
1532 err_v6_add_protocol:
1533 sctp_v4_del_protocol();
1535 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1536 err_register_ctrlsock:
1537 sctp_v6_protosw_exit();
1538 err_v6_protosw_init:
1539 sctp_v4_protosw_exit();
1541 unregister_pernet_subsys(&sctp_defaults_ops);
1542 err_register_defaults:
1545 sctp_sysctl_unregister();
1546 free_pages((unsigned long)sctp_port_hashtable,
1547 get_order(sctp_port_hashsize *
1548 sizeof(struct sctp_bind_hashbucket)));
1550 kfree(sctp_ep_hashtable);
1552 free_pages((unsigned long)sctp_assoc_hashtable,
1553 get_order(sctp_assoc_hashsize *
1554 sizeof(struct sctp_hashbucket)));
1556 percpu_counter_destroy(&sctp_sockets_allocated);
1557 err_percpu_counter_init:
1558 kmem_cache_destroy(sctp_chunk_cachep);
1560 kmem_cache_destroy(sctp_bucket_cachep);
1564 /* Exit handler for the SCTP protocol. */
1565 static __exit void sctp_exit(void)
1567 /* BUG. This should probably do something useful like clean
1568 * up all the remaining associations and all that memory.
1571 /* Unregister with inet6/inet layers. */
1572 sctp_v6_del_protocol();
1573 sctp_v4_del_protocol();
1575 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1577 /* Free protosw registrations */
1578 sctp_v6_protosw_exit();
1579 sctp_v4_protosw_exit();
1581 unregister_pernet_subsys(&sctp_defaults_ops);
1583 /* Unregister with socket layer. */
1587 sctp_sysctl_unregister();
1589 free_pages((unsigned long)sctp_assoc_hashtable,
1590 get_order(sctp_assoc_hashsize *
1591 sizeof(struct sctp_hashbucket)));
1592 kfree(sctp_ep_hashtable);
1593 free_pages((unsigned long)sctp_port_hashtable,
1594 get_order(sctp_port_hashsize *
1595 sizeof(struct sctp_bind_hashbucket)));
1597 percpu_counter_destroy(&sctp_sockets_allocated);
1599 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1601 kmem_cache_destroy(sctp_chunk_cachep);
1602 kmem_cache_destroy(sctp_bucket_cachep);
1605 module_init(sctp_init);
1606 module_exit(sctp_exit);
1609 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1611 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1612 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1613 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1614 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1615 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1616 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1617 MODULE_LICENSE("GPL");