1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/inetdevice.h>
48 #include <linux/seq_file.h>
49 #include <linux/bootmem.h>
50 #include <linux/highmem.h>
51 #include <linux/swap.h>
52 #include <linux/slab.h>
53 #include <net/net_namespace.h>
54 #include <net/protocol.h>
57 #include <net/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
63 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
65 /* Global data structures. */
66 struct sctp_globals sctp_globals __read_mostly;
68 struct idr sctp_assocs_id;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
71 static struct sctp_pf *sctp_pf_inet6_specific;
72 static struct sctp_pf *sctp_pf_inet_specific;
73 static struct sctp_af *sctp_af_v4_specific;
74 static struct sctp_af *sctp_af_v6_specific;
76 struct kmem_cache *sctp_chunk_cachep __read_mostly;
77 struct kmem_cache *sctp_bucket_cachep __read_mostly;
79 long sysctl_sctp_mem[3];
80 int sysctl_sctp_rmem[3];
81 int sysctl_sctp_wmem[3];
83 /* Private helper to extract ipv4 address and stash them in
84 * the protocol structure.
86 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
87 struct net_device *dev)
89 struct in_device *in_dev;
90 struct in_ifaddr *ifa;
91 struct sctp_sockaddr_entry *addr;
94 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
99 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
100 /* Add the address to the local list. */
101 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
103 addr->a.v4.sin_family = AF_INET;
104 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
106 INIT_LIST_HEAD(&addr->list);
107 list_add_tail(&addr->list, addrlist);
114 /* Extract our IP addresses from the system and stash them in the
115 * protocol structure.
117 static void sctp_get_local_addr_list(struct net *net)
119 struct net_device *dev;
120 struct list_head *pos;
124 for_each_netdev_rcu(net, dev) {
125 list_for_each(pos, &sctp_address_families) {
126 af = list_entry(pos, struct sctp_af, list);
127 af->copy_addrlist(&net->sctp.local_addr_list, dev);
133 /* Free the existing local addresses. */
134 static void sctp_free_local_addr_list(struct net *net)
136 struct sctp_sockaddr_entry *addr;
137 struct list_head *pos, *temp;
139 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
140 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
146 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
147 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
148 enum sctp_scope scope, gfp_t gfp, int copy_flags)
150 struct sctp_sockaddr_entry *addr;
151 union sctp_addr laddr;
155 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
158 if (!sctp_in_scope(net, &addr->a, scope))
161 /* Now that the address is in scope, check to see if
162 * the address type is really supported by the local
163 * sock as well as the remote peer.
165 if (addr->a.sa.sa_family == AF_INET &&
166 !(copy_flags & SCTP_ADDR4_PEERSUPP))
168 if (addr->a.sa.sa_family == AF_INET6 &&
169 (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
170 !(copy_flags & SCTP_ADDR6_PEERSUPP)))
174 /* also works for setting ipv6 address port */
175 laddr.v4.sin_port = htons(bp->port);
176 if (sctp_bind_addr_state(bp, &laddr) != -1)
179 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
180 SCTP_ADDR_SRC, GFP_ATOMIC);
189 /* Copy over any ip options */
190 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
192 struct inet_sock *newinet, *inet = inet_sk(sk);
193 struct ip_options_rcu *inet_opt, *newopt = NULL;
195 newinet = inet_sk(newsk);
198 inet_opt = rcu_dereference(inet->inet_opt);
200 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
201 inet_opt->opt.optlen, GFP_ATOMIC);
203 memcpy(newopt, inet_opt, sizeof(*inet_opt) +
204 inet_opt->opt.optlen);
206 pr_err("%s: Failed to copy ip options\n", __func__);
208 RCU_INIT_POINTER(newinet->inet_opt, newopt);
212 /* Account for the IP options */
213 static int sctp_v4_ip_options_len(struct sock *sk)
215 struct inet_sock *inet = inet_sk(sk);
216 struct ip_options_rcu *inet_opt;
220 inet_opt = rcu_dereference(inet->inet_opt);
222 len = inet_opt->opt.optlen;
228 /* Initialize a sctp_addr from in incoming skb. */
229 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
232 /* Always called on head skb, so this is safe */
233 struct sctphdr *sh = sctp_hdr(skb);
234 struct sockaddr_in *sa = &addr->v4;
236 addr->v4.sin_family = AF_INET;
239 sa->sin_port = sh->source;
240 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
242 sa->sin_port = sh->dest;
243 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
245 memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
248 /* Initialize an sctp_addr from a socket. */
249 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
251 addr->v4.sin_family = AF_INET;
252 addr->v4.sin_port = 0;
253 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
254 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
257 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
258 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
260 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
263 /* Initialize sk->sk_daddr from sctp_addr. */
264 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
266 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
269 /* Initialize a sctp_addr from an address parameter. */
270 static void sctp_v4_from_addr_param(union sctp_addr *addr,
271 union sctp_addr_param *param,
272 __be16 port, int iif)
274 addr->v4.sin_family = AF_INET;
275 addr->v4.sin_port = port;
276 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
277 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
280 /* Initialize an address parameter from a sctp_addr and return the length
281 * of the address parameter.
283 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
284 union sctp_addr_param *param)
286 int length = sizeof(struct sctp_ipv4addr_param);
288 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
289 param->v4.param_hdr.length = htons(length);
290 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
295 /* Initialize a sctp_addr from a dst_entry. */
296 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
299 saddr->v4.sin_family = AF_INET;
300 saddr->v4.sin_port = port;
301 saddr->v4.sin_addr.s_addr = fl4->saddr;
302 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
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;
325 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
328 /* Is this a wildcard address? */
329 static int sctp_v4_is_any(const union sctp_addr *addr)
331 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
334 /* This function checks if the address is a valid address to be used for
338 * Return 0 - If the address is a non-unicast or an illegal address.
339 * Return 1 - If the address is a unicast.
341 static int sctp_v4_addr_valid(union sctp_addr *addr,
342 struct sctp_sock *sp,
343 const struct sk_buff *skb)
345 /* IPv4 addresses not allowed */
346 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
349 /* Is this a non-unicast address or a unusable SCTP address? */
350 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
353 /* Is this a broadcast address? */
354 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
360 /* Should this be available for binding? */
361 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
363 struct net *net = sock_net(&sp->inet.sk);
364 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
367 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
369 !sp->inet.freebind &&
370 !net->ipv4.sysctl_ip_nonlocal_bind)
373 if (ipv6_only_sock(sctp_opt2sk(sp)))
379 /* Checking the loopback, private and other address scopes as defined in
380 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
381 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
383 * Level 0 - unusable SCTP addresses
384 * Level 1 - loopback address
385 * Level 2 - link-local addresses
386 * Level 3 - private addresses.
387 * Level 4 - global addresses
388 * For INIT and INIT-ACK address list, let L be the level of
389 * of requested destination address, sender and receiver
390 * SHOULD include all of its addresses with level greater
391 * than or equal to L.
393 * IPv4 scoping can be controlled through sysctl option
394 * net.sctp.addr_scope_policy
396 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
398 enum sctp_scope retval;
400 /* Check for unusable SCTP addresses. */
401 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
402 retval = SCTP_SCOPE_UNUSABLE;
403 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
404 retval = SCTP_SCOPE_LOOPBACK;
405 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
406 retval = SCTP_SCOPE_LINK;
407 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
408 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
409 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
410 retval = SCTP_SCOPE_PRIVATE;
412 retval = SCTP_SCOPE_GLOBAL;
418 /* Returns a valid dst cache entry for the given source and destination ip
419 * addresses. If an association is passed, trys to get a dst entry with a
420 * source address that matches an address in the bind address list.
422 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
423 struct flowi *fl, struct sock *sk)
425 struct sctp_association *asoc = t->asoc;
427 struct flowi4 *fl4 = &fl->u.ip4;
428 struct sctp_bind_addr *bp;
429 struct sctp_sockaddr_entry *laddr;
430 struct dst_entry *dst = NULL;
431 union sctp_addr *daddr = &t->ipaddr;
432 union sctp_addr dst_saddr;
433 __u8 tos = inet_sk(sk)->tos;
435 if (t->dscp & SCTP_DSCP_SET_MASK)
436 tos = t->dscp & SCTP_DSCP_VAL_MASK;
437 memset(fl4, 0x0, sizeof(struct flowi4));
438 fl4->daddr = daddr->v4.sin_addr.s_addr;
439 fl4->fl4_dport = daddr->v4.sin_port;
440 fl4->flowi4_proto = IPPROTO_SCTP;
442 fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
443 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
444 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
447 fl4->saddr = saddr->v4.sin_addr.s_addr;
449 fl4->fl4_sport = saddr->v4.sin_port;
452 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
455 rt = ip_route_output_key(sock_net(sk), fl4);
459 /* If there is no association or if a source address is passed, no
460 * more validation is required.
465 bp = &asoc->base.bind_addr;
468 /* Walk through the bind address list and look for a bind
469 * address that matches the source address of the returned dst.
471 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
473 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
474 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
475 (laddr->state != SCTP_ADDR_SRC &&
476 !asoc->src_out_of_asoc_ok))
478 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
483 /* None of the bound addresses match the source address of the
484 * dst. So release it.
490 /* Walk through the bind address list and try to get a dst that
491 * matches a bind address as the source address.
494 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
495 struct net_device *odev;
499 if (laddr->state != SCTP_ADDR_SRC ||
500 AF_INET != laddr->a.sa.sa_family)
503 fl4->fl4_sport = laddr->a.v4.sin_port;
504 flowi4_update_output(fl4,
505 asoc->base.sk->sk_bound_dev_if,
506 RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
507 daddr->v4.sin_addr.s_addr,
508 laddr->a.v4.sin_addr.s_addr);
510 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) {
523 dst_release(&rt->dst);
537 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
538 &fl4->daddr, &fl4->saddr);
540 pr_debug("no route\n");
543 /* For v4, the source address is cached in the route entry(dst). So no need
544 * to cache it separately and hence this is an empty routine.
546 static void sctp_v4_get_saddr(struct sctp_sock *sk,
547 struct sctp_transport *t,
550 union sctp_addr *saddr = &t->saddr;
551 struct rtable *rt = (struct rtable *)t->dst;
554 saddr->v4.sin_family = AF_INET;
555 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
559 /* What interface did this skb arrive on? */
560 static int sctp_v4_skb_iif(const struct sk_buff *skb)
562 return inet_iif(skb);
565 /* Was this packet marked by Explicit Congestion Notification? */
566 static int sctp_v4_is_ce(const struct sk_buff *skb)
568 return INET_ECN_is_ce(ip_hdr(skb)->tos);
571 /* Create and initialize a new sk for the socket returned by accept(). */
572 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
573 struct sctp_association *asoc,
576 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
578 struct inet_sock *newinet;
583 sock_init_data(NULL, newsk);
585 sctp_copy_sock(newsk, sk, asoc);
586 sock_reset_flag(newsk, SOCK_ZAPPED);
588 sctp_v4_copy_ip_options(sk, newsk);
590 newinet = inet_sk(newsk);
592 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
594 sk_refcnt_debug_inc(newsk);
596 if (newsk->sk_prot->init(newsk)) {
597 sk_common_release(newsk);
605 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
607 /* No address mapping for V4 sockets */
608 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
609 return sizeof(struct sockaddr_in);
612 /* Dump the v4 addr to the seq file. */
613 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
615 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
618 static void sctp_v4_ecn_capable(struct sock *sk)
623 static void sctp_addr_wq_timeout_handler(struct timer_list *t)
625 struct net *net = from_timer(net, t, sctp.addr_wq_timer);
626 struct sctp_sockaddr_entry *addrw, *temp;
627 struct sctp_sock *sp;
629 spin_lock_bh(&net->sctp.addr_wq_lock);
631 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
632 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
633 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
634 addrw->state, addrw);
636 #if IS_ENABLED(CONFIG_IPV6)
637 /* Now we send an ASCONF for each association */
638 /* Note. we currently don't handle link local IPv6 addressees */
639 if (addrw->a.sa.sa_family == AF_INET6) {
640 struct in6_addr *in6;
642 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
646 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
647 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
648 addrw->state == SCTP_ADDR_NEW) {
649 unsigned long timeo_val;
651 pr_debug("%s: this is on DAD, trying %d sec "
653 SCTP_ADDRESS_TICK_DELAY);
656 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
657 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
662 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
665 sk = sctp_opt2sk(sp);
666 /* ignore bound-specific endpoints */
667 if (!sctp_is_ep_boundall(sk))
670 if (sctp_asconf_mgmt(sp, addrw) < 0)
671 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
674 #if IS_ENABLED(CONFIG_IPV6)
677 list_del(&addrw->list);
680 spin_unlock_bh(&net->sctp.addr_wq_lock);
683 static void sctp_free_addr_wq(struct net *net)
685 struct sctp_sockaddr_entry *addrw;
686 struct sctp_sockaddr_entry *temp;
688 spin_lock_bh(&net->sctp.addr_wq_lock);
689 del_timer(&net->sctp.addr_wq_timer);
690 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
691 list_del(&addrw->list);
694 spin_unlock_bh(&net->sctp.addr_wq_lock);
697 /* lookup the entry for the same address in the addr_waitq
698 * sctp_addr_wq MUST be locked
700 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
701 struct sctp_sockaddr_entry *addr)
703 struct sctp_sockaddr_entry *addrw;
705 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
706 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
708 if (addrw->a.sa.sa_family == AF_INET) {
709 if (addrw->a.v4.sin_addr.s_addr ==
710 addr->a.v4.sin_addr.s_addr)
712 } else if (addrw->a.sa.sa_family == AF_INET6) {
713 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
714 &addr->a.v6.sin6_addr))
721 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
723 struct sctp_sockaddr_entry *addrw;
724 unsigned long timeo_val;
726 /* first, we check if an opposite message already exist in the queue.
727 * If we found such message, it is removed.
728 * This operation is a bit stupid, but the DHCP client attaches the
729 * new address after a couple of addition and deletion of that address
732 spin_lock_bh(&net->sctp.addr_wq_lock);
733 /* Offsets existing events in addr_wq */
734 addrw = sctp_addr_wq_lookup(net, addr);
736 if (addrw->state != cmd) {
737 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
738 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
739 &net->sctp.addr_waitq);
741 list_del(&addrw->list);
744 spin_unlock_bh(&net->sctp.addr_wq_lock);
748 /* OK, we have to add the new address to the wait queue */
749 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
751 spin_unlock_bh(&net->sctp.addr_wq_lock);
755 list_add_tail(&addrw->list, &net->sctp.addr_waitq);
757 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
758 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
760 if (!timer_pending(&net->sctp.addr_wq_timer)) {
762 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
763 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
765 spin_unlock_bh(&net->sctp.addr_wq_lock);
768 /* Event handler for inet address addition/deletion events.
769 * The sctp_local_addr_list needs to be protocted by a spin lock since
770 * multiple notifiers (say IPv4 and IPv6) may be running at the same
771 * time and thus corrupt the list.
772 * The reader side is protected with RCU.
774 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
777 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
778 struct sctp_sockaddr_entry *addr = NULL;
779 struct sctp_sockaddr_entry *temp;
780 struct net *net = dev_net(ifa->ifa_dev->dev);
785 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
787 addr->a.v4.sin_family = AF_INET;
788 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
790 spin_lock_bh(&net->sctp.local_addr_lock);
791 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
792 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
793 spin_unlock_bh(&net->sctp.local_addr_lock);
797 spin_lock_bh(&net->sctp.local_addr_lock);
798 list_for_each_entry_safe(addr, temp,
799 &net->sctp.local_addr_list, list) {
800 if (addr->a.sa.sa_family == AF_INET &&
801 addr->a.v4.sin_addr.s_addr ==
803 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
806 list_del_rcu(&addr->list);
810 spin_unlock_bh(&net->sctp.local_addr_lock);
812 kfree_rcu(addr, rcu);
820 * Initialize the control inode/socket with a control endpoint data
821 * structure. This endpoint is reserved exclusively for the OOTB processing.
823 static int sctp_ctl_sock_init(struct net *net)
826 sa_family_t family = PF_INET;
828 if (sctp_get_pf_specific(PF_INET6))
831 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
832 SOCK_SEQPACKET, IPPROTO_SCTP, net);
834 /* If IPv6 socket could not be created, try the IPv4 socket */
835 if (err < 0 && family == PF_INET6)
836 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
837 SOCK_SEQPACKET, IPPROTO_SCTP,
841 pr_err("Failed to create the SCTP control socket\n");
847 /* Register address family specific functions. */
848 int sctp_register_af(struct sctp_af *af)
850 switch (af->sa_family) {
852 if (sctp_af_v4_specific)
854 sctp_af_v4_specific = af;
857 if (sctp_af_v6_specific)
859 sctp_af_v6_specific = af;
865 INIT_LIST_HEAD(&af->list);
866 list_add_tail(&af->list, &sctp_address_families);
870 /* Get the table of functions for manipulating a particular address
873 struct sctp_af *sctp_get_af_specific(sa_family_t family)
877 return sctp_af_v4_specific;
879 return sctp_af_v6_specific;
885 /* Common code to initialize a AF_INET msg_name. */
886 static void sctp_inet_msgname(char *msgname, int *addr_len)
888 struct sockaddr_in *sin;
890 sin = (struct sockaddr_in *)msgname;
891 *addr_len = sizeof(struct sockaddr_in);
892 sin->sin_family = AF_INET;
893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
896 /* Copy the primary address of the peer primary address as the msg_name. */
897 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
900 struct sockaddr_in *sin, *sinfrom;
903 struct sctp_association *asoc;
906 sctp_inet_msgname(msgname, addr_len);
907 sin = (struct sockaddr_in *)msgname;
908 sinfrom = &asoc->peer.primary_addr.v4;
909 sin->sin_port = htons(asoc->peer.port);
910 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
914 /* Initialize and copy out a msgname from an inbound skb. */
915 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
918 struct sctphdr *sh = sctp_hdr(skb);
919 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
921 sctp_inet_msgname(msgname, len);
922 sin->sin_port = sh->source;
923 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
927 /* Do we support this AF? */
928 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
930 /* PF_INET only supports AF_INET addresses. */
931 return AF_INET == family;
934 /* Address matching with wildcards allowed. */
935 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
936 const union sctp_addr *addr2,
937 struct sctp_sock *opt)
939 /* PF_INET only supports AF_INET addresses. */
940 if (addr1->sa.sa_family != addr2->sa.sa_family)
942 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
943 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
945 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
951 /* Verify that provided sockaddr looks bindable. Common verification has
952 * already been taken care of.
954 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
956 return sctp_v4_available(addr, opt);
959 /* Verify that sockaddr looks sendable. Common verification has already
960 * been taken care of.
962 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
967 /* Fill in Supported Address Type information for INIT and INIT-ACK
968 * chunks. Returns number of addresses supported.
970 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
973 types[0] = SCTP_PARAM_IPV4_ADDRESS;
977 /* Wrapper routine that calls the ip transmit routine. */
978 static inline int sctp_v4_xmit(struct sk_buff *skb,
979 struct sctp_transport *transport)
981 struct inet_sock *inet = inet_sk(skb->sk);
982 __u8 dscp = inet->tos;
984 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
985 skb->len, &transport->fl.u.ip4.saddr,
986 &transport->fl.u.ip4.daddr);
988 if (transport->dscp & SCTP_DSCP_SET_MASK)
989 dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
991 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
992 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
994 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
996 return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
999 static struct sctp_af sctp_af_inet;
1001 static struct sctp_pf sctp_pf_inet = {
1002 .event_msgname = sctp_inet_event_msgname,
1003 .skb_msgname = sctp_inet_skb_msgname,
1004 .af_supported = sctp_inet_af_supported,
1005 .cmp_addr = sctp_inet_cmp_addr,
1006 .bind_verify = sctp_inet_bind_verify,
1007 .send_verify = sctp_inet_send_verify,
1008 .supported_addrs = sctp_inet_supported_addrs,
1009 .create_accept_sk = sctp_v4_create_accept_sk,
1010 .addr_to_user = sctp_v4_addr_to_user,
1011 .to_sk_saddr = sctp_v4_to_sk_saddr,
1012 .to_sk_daddr = sctp_v4_to_sk_daddr,
1013 .copy_ip_options = sctp_v4_copy_ip_options,
1017 /* Notifier for inetaddr addition/deletion events. */
1018 static struct notifier_block sctp_inetaddr_notifier = {
1019 .notifier_call = sctp_inetaddr_event,
1022 /* Socket operations. */
1023 static const struct proto_ops inet_seqpacket_ops = {
1025 .owner = THIS_MODULE,
1026 .release = inet_release, /* Needs to be wrapped... */
1028 .connect = sctp_inet_connect,
1029 .socketpair = sock_no_socketpair,
1030 .accept = inet_accept,
1031 .getname = inet_getname, /* Semantics are different. */
1033 .ioctl = inet_ioctl,
1034 .listen = sctp_inet_listen,
1035 .shutdown = inet_shutdown, /* Looks harmless. */
1036 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1037 .getsockopt = sock_common_getsockopt,
1038 .sendmsg = inet_sendmsg,
1039 .recvmsg = inet_recvmsg,
1040 .mmap = sock_no_mmap,
1041 .sendpage = sock_no_sendpage,
1042 #ifdef CONFIG_COMPAT
1043 .compat_setsockopt = compat_sock_common_setsockopt,
1044 .compat_getsockopt = compat_sock_common_getsockopt,
1048 /* Registration with AF_INET family. */
1049 static struct inet_protosw sctp_seqpacket_protosw = {
1050 .type = SOCK_SEQPACKET,
1051 .protocol = IPPROTO_SCTP,
1053 .ops = &inet_seqpacket_ops,
1054 .flags = SCTP_PROTOSW_FLAG
1056 static struct inet_protosw sctp_stream_protosw = {
1057 .type = SOCK_STREAM,
1058 .protocol = IPPROTO_SCTP,
1060 .ops = &inet_seqpacket_ops,
1061 .flags = SCTP_PROTOSW_FLAG
1064 /* Register with IP layer. */
1065 static const struct net_protocol sctp_protocol = {
1066 .handler = sctp_rcv,
1067 .err_handler = sctp_v4_err,
1070 .icmp_strict_tag_validation = 1,
1073 /* IPv4 address related functions. */
1074 static struct sctp_af sctp_af_inet = {
1075 .sa_family = AF_INET,
1076 .sctp_xmit = sctp_v4_xmit,
1077 .setsockopt = ip_setsockopt,
1078 .getsockopt = ip_getsockopt,
1079 .get_dst = sctp_v4_get_dst,
1080 .get_saddr = sctp_v4_get_saddr,
1081 .copy_addrlist = sctp_v4_copy_addrlist,
1082 .from_skb = sctp_v4_from_skb,
1083 .from_sk = sctp_v4_from_sk,
1084 .from_addr_param = sctp_v4_from_addr_param,
1085 .to_addr_param = sctp_v4_to_addr_param,
1086 .cmp_addr = sctp_v4_cmp_addr,
1087 .addr_valid = sctp_v4_addr_valid,
1088 .inaddr_any = sctp_v4_inaddr_any,
1089 .is_any = sctp_v4_is_any,
1090 .available = sctp_v4_available,
1091 .scope = sctp_v4_scope,
1092 .skb_iif = sctp_v4_skb_iif,
1093 .is_ce = sctp_v4_is_ce,
1094 .seq_dump_addr = sctp_v4_seq_dump_addr,
1095 .ecn_capable = sctp_v4_ecn_capable,
1096 .net_header_len = sizeof(struct iphdr),
1097 .sockaddr_len = sizeof(struct sockaddr_in),
1098 .ip_options_len = sctp_v4_ip_options_len,
1099 #ifdef CONFIG_COMPAT
1100 .compat_setsockopt = compat_ip_setsockopt,
1101 .compat_getsockopt = compat_ip_getsockopt,
1105 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1109 return sctp_pf_inet_specific;
1111 return sctp_pf_inet6_specific;
1117 /* Register the PF specific function table. */
1118 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1122 if (sctp_pf_inet_specific)
1124 sctp_pf_inet_specific = pf;
1127 if (sctp_pf_inet6_specific)
1129 sctp_pf_inet6_specific = pf;
1137 static inline int init_sctp_mibs(struct net *net)
1139 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1140 if (!net->sctp.sctp_statistics)
1145 static inline void cleanup_sctp_mibs(struct net *net)
1147 free_percpu(net->sctp.sctp_statistics);
1150 static void sctp_v4_pf_init(void)
1152 /* Initialize the SCTP specific PF functions. */
1153 sctp_register_pf(&sctp_pf_inet, PF_INET);
1154 sctp_register_af(&sctp_af_inet);
1157 static void sctp_v4_pf_exit(void)
1159 list_del(&sctp_af_inet.list);
1162 static int sctp_v4_protosw_init(void)
1166 rc = proto_register(&sctp_prot, 1);
1170 /* Register SCTP(UDP and TCP style) with socket layer. */
1171 inet_register_protosw(&sctp_seqpacket_protosw);
1172 inet_register_protosw(&sctp_stream_protosw);
1177 static void sctp_v4_protosw_exit(void)
1179 inet_unregister_protosw(&sctp_stream_protosw);
1180 inet_unregister_protosw(&sctp_seqpacket_protosw);
1181 proto_unregister(&sctp_prot);
1184 static int sctp_v4_add_protocol(void)
1186 /* Register notifier for inet address additions/deletions. */
1187 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1189 /* Register SCTP with inet layer. */
1190 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1196 static void sctp_v4_del_protocol(void)
1198 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1199 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1202 static int __net_init sctp_defaults_init(struct net *net)
1207 * 14. Suggested SCTP Protocol Parameter Values
1209 /* The following protocol parameters are RECOMMENDED: */
1210 /* RTO.Initial - 3 seconds */
1211 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1212 /* RTO.Min - 1 second */
1213 net->sctp.rto_min = SCTP_RTO_MIN;
1214 /* RTO.Max - 60 seconds */
1215 net->sctp.rto_max = SCTP_RTO_MAX;
1216 /* RTO.Alpha - 1/8 */
1217 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1218 /* RTO.Beta - 1/4 */
1219 net->sctp.rto_beta = SCTP_RTO_BETA;
1221 /* Valid.Cookie.Life - 60 seconds */
1222 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1224 /* Whether Cookie Preservative is enabled(1) or not(0) */
1225 net->sctp.cookie_preserve_enable = 1;
1227 /* Default sctp sockets to use md5 as their hmac alg */
1228 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1229 net->sctp.sctp_hmac_alg = "md5";
1230 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1231 net->sctp.sctp_hmac_alg = "sha1";
1233 net->sctp.sctp_hmac_alg = NULL;
1237 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1239 /* Enable pf state by default */
1240 net->sctp.pf_enable = 1;
1242 /* Association.Max.Retrans - 10 attempts
1243 * Path.Max.Retrans - 5 attempts (per destination address)
1244 * Max.Init.Retransmits - 8 attempts
1246 net->sctp.max_retrans_association = 10;
1247 net->sctp.max_retrans_path = 5;
1248 net->sctp.max_retrans_init = 8;
1250 /* Sendbuffer growth - do per-socket accounting */
1251 net->sctp.sndbuf_policy = 0;
1253 /* Rcvbuffer growth - do per-socket accounting */
1254 net->sctp.rcvbuf_policy = 0;
1256 /* HB.interval - 30 seconds */
1257 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1259 /* delayed SACK timeout */
1260 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1262 /* Disable ADDIP by default. */
1263 net->sctp.addip_enable = 0;
1264 net->sctp.addip_noauth = 0;
1265 net->sctp.default_auto_asconf = 0;
1267 /* Enable PR-SCTP by default. */
1268 net->sctp.prsctp_enable = 1;
1270 /* Disable RECONF by default. */
1271 net->sctp.reconf_enable = 0;
1273 /* Disable AUTH by default. */
1274 net->sctp.auth_enable = 0;
1276 /* Set SCOPE policy to enabled */
1277 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1279 /* Set the default rwnd update threshold */
1280 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1282 /* Initialize maximum autoclose timeout. */
1283 net->sctp.max_autoclose = INT_MAX / HZ;
1285 status = sctp_sysctl_net_register(net);
1287 goto err_sysctl_register;
1289 /* Allocate and initialise sctp mibs. */
1290 status = init_sctp_mibs(net);
1294 #ifdef CONFIG_PROC_FS
1295 /* Initialize proc fs directory. */
1296 status = sctp_proc_init(net);
1301 sctp_dbg_objcnt_init(net);
1303 /* Initialize the local address list. */
1304 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1305 spin_lock_init(&net->sctp.local_addr_lock);
1306 sctp_get_local_addr_list(net);
1308 /* Initialize the address event list */
1309 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1310 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1311 spin_lock_init(&net->sctp.addr_wq_lock);
1312 net->sctp.addr_wq_timer.expires = 0;
1313 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1317 #ifdef CONFIG_PROC_FS
1319 cleanup_sctp_mibs(net);
1322 sctp_sysctl_net_unregister(net);
1323 err_sysctl_register:
1327 static void __net_exit sctp_defaults_exit(struct net *net)
1329 /* Free the local address list */
1330 sctp_free_addr_wq(net);
1331 sctp_free_local_addr_list(net);
1333 #ifdef CONFIG_PROC_FS
1334 remove_proc_subtree("sctp", net->proc_net);
1335 net->sctp.proc_net_sctp = NULL;
1337 cleanup_sctp_mibs(net);
1338 sctp_sysctl_net_unregister(net);
1341 static struct pernet_operations sctp_defaults_ops = {
1342 .init = sctp_defaults_init,
1343 .exit = sctp_defaults_exit,
1346 static int __net_init sctp_ctrlsock_init(struct net *net)
1350 /* Initialize the control inode/socket for handling OOTB packets. */
1351 status = sctp_ctl_sock_init(net);
1353 pr_err("Failed to initialize the SCTP control sock\n");
1358 static void __net_exit sctp_ctrlsock_exit(struct net *net)
1360 /* Free the control endpoint. */
1361 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1364 static struct pernet_operations sctp_ctrlsock_ops = {
1365 .init = sctp_ctrlsock_init,
1366 .exit = sctp_ctrlsock_exit,
1369 /* Initialize the universe into something sensible. */
1370 static __init int sctp_init(void)
1373 int status = -EINVAL;
1375 unsigned long limit;
1379 int max_entry_order;
1381 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1383 /* Allocate bind_bucket and chunk caches. */
1385 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1386 sizeof(struct sctp_bind_bucket),
1387 0, SLAB_HWCACHE_ALIGN,
1389 if (!sctp_bucket_cachep)
1392 sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1393 sizeof(struct sctp_chunk),
1394 0, SLAB_HWCACHE_ALIGN,
1396 if (!sctp_chunk_cachep)
1397 goto err_chunk_cachep;
1399 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1401 goto err_percpu_counter_init;
1403 /* Implementation specific variables. */
1405 /* Initialize default stream count setup information. */
1406 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS;
1407 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS;
1409 /* Initialize handle used for association ids. */
1410 idr_init(&sctp_assocs_id);
1412 limit = nr_free_buffer_pages() / 8;
1413 limit = max(limit, 128UL);
1414 sysctl_sctp_mem[0] = limit / 4 * 3;
1415 sysctl_sctp_mem[1] = limit;
1416 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1418 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1419 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1420 max_share = min(4UL*1024*1024, limit);
1422 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1423 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1424 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1426 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1427 sysctl_sctp_wmem[1] = 16*1024;
1428 sysctl_sctp_wmem[2] = max(64*1024, max_share);
1430 /* Size and allocate the association hash table.
1431 * The methodology is similar to that of the tcp hash tables.
1432 * Though not identical. Start by getting a goal size
1434 if (totalram_pages >= (128 * 1024))
1435 goal = totalram_pages >> (22 - PAGE_SHIFT);
1437 goal = totalram_pages >> (24 - PAGE_SHIFT);
1439 /* Then compute the page order for said goal */
1440 order = get_order(goal);
1442 /* Now compute the required page order for the maximum sized table we
1445 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1446 sizeof(struct sctp_bind_hashbucket));
1448 /* Limit the page order by that maximum hash table size */
1449 order = min(order, max_entry_order);
1451 /* Allocate and initialize the endpoint hash table. */
1452 sctp_ep_hashsize = 64;
1454 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1455 if (!sctp_ep_hashtable) {
1456 pr_err("Failed endpoint_hash alloc\n");
1458 goto err_ehash_alloc;
1460 for (i = 0; i < sctp_ep_hashsize; i++) {
1461 rwlock_init(&sctp_ep_hashtable[i].lock);
1462 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1465 /* Allocate and initialize the SCTP port hash table.
1466 * Note that order is initalized to start at the max sized
1467 * table we want to support. If we can't get that many pages
1468 * reduce the order and try again
1471 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1472 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1473 } while (!sctp_port_hashtable && --order > 0);
1475 if (!sctp_port_hashtable) {
1476 pr_err("Failed bind hash alloc\n");
1478 goto err_bhash_alloc;
1481 /* Now compute the number of entries that will fit in the
1482 * port hash space we allocated
1484 num_entries = (1UL << order) * PAGE_SIZE /
1485 sizeof(struct sctp_bind_hashbucket);
1487 /* And finish by rounding it down to the nearest power of two
1488 * this wastes some memory of course, but its needed because
1489 * the hash function operates based on the assumption that
1490 * that the number of entries is a power of two
1492 sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1494 for (i = 0; i < sctp_port_hashsize; i++) {
1495 spin_lock_init(&sctp_port_hashtable[i].lock);
1496 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1499 status = sctp_transport_hashtable_init();
1501 goto err_thash_alloc;
1503 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1506 sctp_sysctl_register();
1508 INIT_LIST_HEAD(&sctp_address_families);
1511 sctp_sched_ops_init();
1513 status = register_pernet_subsys(&sctp_defaults_ops);
1515 goto err_register_defaults;
1517 status = sctp_v4_protosw_init();
1519 goto err_protosw_init;
1521 status = sctp_v6_protosw_init();
1523 goto err_v6_protosw_init;
1525 status = register_pernet_subsys(&sctp_ctrlsock_ops);
1527 goto err_register_ctrlsock;
1529 status = sctp_v4_add_protocol();
1531 goto err_add_protocol;
1533 /* Register SCTP with inet6 layer. */
1534 status = sctp_v6_add_protocol();
1536 goto err_v6_add_protocol;
1538 if (sctp_offload_init() < 0)
1539 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1543 err_v6_add_protocol:
1544 sctp_v4_del_protocol();
1546 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1547 err_register_ctrlsock:
1548 sctp_v6_protosw_exit();
1549 err_v6_protosw_init:
1550 sctp_v4_protosw_exit();
1552 unregister_pernet_subsys(&sctp_defaults_ops);
1553 err_register_defaults:
1556 sctp_sysctl_unregister();
1557 free_pages((unsigned long)sctp_port_hashtable,
1558 get_order(sctp_port_hashsize *
1559 sizeof(struct sctp_bind_hashbucket)));
1561 sctp_transport_hashtable_destroy();
1563 kfree(sctp_ep_hashtable);
1565 percpu_counter_destroy(&sctp_sockets_allocated);
1566 err_percpu_counter_init:
1567 kmem_cache_destroy(sctp_chunk_cachep);
1569 kmem_cache_destroy(sctp_bucket_cachep);
1573 /* Exit handler for the SCTP protocol. */
1574 static __exit void sctp_exit(void)
1576 /* BUG. This should probably do something useful like clean
1577 * up all the remaining associations and all that memory.
1580 /* Unregister with inet6/inet layers. */
1581 sctp_v6_del_protocol();
1582 sctp_v4_del_protocol();
1584 unregister_pernet_subsys(&sctp_ctrlsock_ops);
1586 /* Free protosw registrations */
1587 sctp_v6_protosw_exit();
1588 sctp_v4_protosw_exit();
1590 unregister_pernet_subsys(&sctp_defaults_ops);
1592 /* Unregister with socket layer. */
1596 sctp_sysctl_unregister();
1598 free_pages((unsigned long)sctp_port_hashtable,
1599 get_order(sctp_port_hashsize *
1600 sizeof(struct sctp_bind_hashbucket)));
1601 kfree(sctp_ep_hashtable);
1602 sctp_transport_hashtable_destroy();
1604 percpu_counter_destroy(&sctp_sockets_allocated);
1606 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1608 kmem_cache_destroy(sctp_chunk_cachep);
1609 kmem_cache_destroy(sctp_bucket_cachep);
1612 module_init(sctp_init);
1613 module_exit(sctp_exit);
1616 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1618 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1619 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1620 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1621 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1622 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1623 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1624 MODULE_LICENSE("GPL");