1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001 Intel Corp.
7 * Copyright (c) 2001 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
10 * This file is part of the SCTP kernel implementation
12 * Initialization/cleanup for SCTP protocol support.
14 * Please send any bug reports or fixes you make to the
16 * lksctp developers <linux-sctp@vger.kernel.org>
18 * Written or modified by:
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Karl Knutson <karl@athena.chicago.il.us>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Sridhar Samudrala <sri@us.ibm.com>
23 * Daisy Chang <daisyc@us.ibm.com>
24 * Ardelle Fan <ardelle.fan@intel.com>
27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/netdevice.h>
32 #include <linux/inetdevice.h>
33 #include <linux/seq_file.h>
34 #include <linux/memblock.h>
35 #include <linux/highmem.h>
36 #include <linux/swap.h>
37 #include <linux/slab.h>
38 #include <net/net_namespace.h>
39 #include <net/protocol.h>
42 #include <net/route.h>
43 #include <net/sctp/sctp.h>
44 #include <net/addrconf.h>
45 #include <net/inet_common.h>
46 #include <net/inet_ecn.h>
48 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
50 /* Global data structures. */
51 struct sctp_globals sctp_globals __read_mostly;
53 struct idr sctp_assocs_id;
54 DEFINE_SPINLOCK(sctp_assocs_id_lock);
56 static struct sctp_pf *sctp_pf_inet6_specific;
57 static struct sctp_pf *sctp_pf_inet_specific;
58 static struct sctp_af *sctp_af_v4_specific;
59 static struct sctp_af *sctp_af_v6_specific;
61 struct kmem_cache *sctp_chunk_cachep __read_mostly;
62 struct kmem_cache *sctp_bucket_cachep __read_mostly;
64 long sysctl_sctp_mem[3];
65 int sysctl_sctp_rmem[3];
66 int sysctl_sctp_wmem[3];
68 /* Private helper to extract ipv4 address and stash them in
69 * the protocol structure.
71 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
72 struct net_device *dev)
74 struct in_device *in_dev;
75 struct in_ifaddr *ifa;
76 struct sctp_sockaddr_entry *addr;
79 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
84 in_dev_for_each_ifa_rcu(ifa, in_dev) {
85 /* Add the address to the local list. */
86 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
88 addr->a.v4.sin_family = AF_INET;
89 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
91 INIT_LIST_HEAD(&addr->list);
92 list_add_tail(&addr->list, addrlist);
99 /* Extract our IP addresses from the system and stash them in the
100 * protocol structure.
102 static void sctp_get_local_addr_list(struct net *net)
104 struct net_device *dev;
105 struct list_head *pos;
109 for_each_netdev_rcu(net, dev) {
110 list_for_each(pos, &sctp_address_families) {
111 af = list_entry(pos, struct sctp_af, list);
112 af->copy_addrlist(&net->sctp.local_addr_list, dev);
118 /* Free the existing local addresses. */
119 static void sctp_free_local_addr_list(struct net *net)
121 struct sctp_sockaddr_entry *addr;
122 struct list_head *pos, *temp;
124 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
125 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
131 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
132 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
133 enum sctp_scope scope, gfp_t gfp, int copy_flags)
135 struct sctp_sockaddr_entry *addr;
136 union sctp_addr laddr;
140 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
143 if (!sctp_in_scope(net, &addr->a, scope))
146 /* Now that the address is in scope, check to see if
147 * the address type is really supported by the local
148 * sock as well as the remote peer.
150 if (addr->a.sa.sa_family == AF_INET &&
151 !(copy_flags & SCTP_ADDR4_PEERSUPP))
153 if (addr->a.sa.sa_family == AF_INET6 &&
154 (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
155 !(copy_flags & SCTP_ADDR6_PEERSUPP)))
159 /* also works for setting ipv6 address port */
160 laddr.v4.sin_port = htons(bp->port);
161 if (sctp_bind_addr_state(bp, &laddr) != -1)
164 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
165 SCTP_ADDR_SRC, GFP_ATOMIC);
174 /* Copy over any ip options */
175 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
177 struct inet_sock *newinet, *inet = inet_sk(sk);
178 struct ip_options_rcu *inet_opt, *newopt = NULL;
180 newinet = inet_sk(newsk);
183 inet_opt = rcu_dereference(inet->inet_opt);
185 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
186 inet_opt->opt.optlen, GFP_ATOMIC);
188 memcpy(newopt, inet_opt, sizeof(*inet_opt) +
189 inet_opt->opt.optlen);
191 pr_err("%s: Failed to copy ip options\n", __func__);
193 RCU_INIT_POINTER(newinet->inet_opt, newopt);
197 /* Account for the IP options */
198 static int sctp_v4_ip_options_len(struct sock *sk)
200 struct inet_sock *inet = inet_sk(sk);
201 struct ip_options_rcu *inet_opt;
205 inet_opt = rcu_dereference(inet->inet_opt);
207 len = inet_opt->opt.optlen;
213 /* Initialize a sctp_addr from in incoming skb. */
214 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
217 /* Always called on head skb, so this is safe */
218 struct sctphdr *sh = sctp_hdr(skb);
219 struct sockaddr_in *sa = &addr->v4;
221 addr->v4.sin_family = AF_INET;
224 sa->sin_port = sh->source;
225 sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
227 sa->sin_port = sh->dest;
228 sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
230 memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
233 /* Initialize an sctp_addr from a socket. */
234 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
236 addr->v4.sin_family = AF_INET;
237 addr->v4.sin_port = 0;
238 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
239 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
242 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
243 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
245 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
248 /* Initialize sk->sk_daddr from sctp_addr. */
249 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
251 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
254 /* Initialize a sctp_addr from an address parameter. */
255 static void sctp_v4_from_addr_param(union sctp_addr *addr,
256 union sctp_addr_param *param,
257 __be16 port, int iif)
259 addr->v4.sin_family = AF_INET;
260 addr->v4.sin_port = port;
261 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
262 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
265 /* Initialize an address parameter from a sctp_addr and return the length
266 * of the address parameter.
268 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
269 union sctp_addr_param *param)
271 int length = sizeof(struct sctp_ipv4addr_param);
273 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
274 param->v4.param_hdr.length = htons(length);
275 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
280 /* Initialize a sctp_addr from a dst_entry. */
281 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
284 saddr->v4.sin_family = AF_INET;
285 saddr->v4.sin_port = port;
286 saddr->v4.sin_addr.s_addr = fl4->saddr;
287 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
290 /* Compare two addresses exactly. */
291 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
292 const union sctp_addr *addr2)
294 if (addr1->sa.sa_family != addr2->sa.sa_family)
296 if (addr1->v4.sin_port != addr2->v4.sin_port)
298 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
304 /* Initialize addr struct to INADDR_ANY. */
305 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
307 addr->v4.sin_family = AF_INET;
308 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
309 addr->v4.sin_port = port;
310 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
313 /* Is this a wildcard address? */
314 static int sctp_v4_is_any(const union sctp_addr *addr)
316 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
319 /* This function checks if the address is a valid address to be used for
323 * Return 0 - If the address is a non-unicast or an illegal address.
324 * Return 1 - If the address is a unicast.
326 static int sctp_v4_addr_valid(union sctp_addr *addr,
327 struct sctp_sock *sp,
328 const struct sk_buff *skb)
330 /* IPv4 addresses not allowed */
331 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
334 /* Is this a non-unicast address or a unusable SCTP address? */
335 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
338 /* Is this a broadcast address? */
339 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
345 /* Should this be available for binding? */
346 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
348 struct net *net = sock_net(&sp->inet.sk);
349 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
352 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
354 !sp->inet.freebind &&
355 !net->ipv4.sysctl_ip_nonlocal_bind)
358 if (ipv6_only_sock(sctp_opt2sk(sp)))
364 /* Checking the loopback, private and other address scopes as defined in
365 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
366 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
368 * Level 0 - unusable SCTP addresses
369 * Level 1 - loopback address
370 * Level 2 - link-local addresses
371 * Level 3 - private addresses.
372 * Level 4 - global addresses
373 * For INIT and INIT-ACK address list, let L be the level of
374 * of requested destination address, sender and receiver
375 * SHOULD include all of its addresses with level greater
376 * than or equal to L.
378 * IPv4 scoping can be controlled through sysctl option
379 * net.sctp.addr_scope_policy
381 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
383 enum sctp_scope retval;
385 /* Check for unusable SCTP addresses. */
386 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
387 retval = SCTP_SCOPE_UNUSABLE;
388 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
389 retval = SCTP_SCOPE_LOOPBACK;
390 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
391 retval = SCTP_SCOPE_LINK;
392 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
393 ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
394 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
395 retval = SCTP_SCOPE_PRIVATE;
397 retval = SCTP_SCOPE_GLOBAL;
403 /* Returns a valid dst cache entry for the given source and destination ip
404 * addresses. If an association is passed, trys to get a dst entry with a
405 * source address that matches an address in the bind address list.
407 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
408 struct flowi *fl, struct sock *sk)
410 struct sctp_association *asoc = t->asoc;
413 struct flowi4 *fl4 = &_fl.u.ip4;
414 struct sctp_bind_addr *bp;
415 struct sctp_sockaddr_entry *laddr;
416 struct dst_entry *dst = NULL;
417 union sctp_addr *daddr = &t->ipaddr;
418 union sctp_addr dst_saddr;
419 __u8 tos = inet_sk(sk)->tos;
421 if (t->dscp & SCTP_DSCP_SET_MASK)
422 tos = t->dscp & SCTP_DSCP_VAL_MASK;
423 memset(&_fl, 0x0, sizeof(_fl));
424 fl4->daddr = daddr->v4.sin_addr.s_addr;
425 fl4->fl4_dport = daddr->v4.sin_port;
426 fl4->flowi4_proto = IPPROTO_SCTP;
428 fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
429 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
430 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
433 fl4->saddr = saddr->v4.sin_addr.s_addr;
435 fl4->fl4_sport = saddr->v4.sin_port;
438 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
441 rt = ip_route_output_key(sock_net(sk), fl4);
445 memcpy(fl, &_fl, sizeof(_fl));
448 /* If there is no association or if a source address is passed, no
449 * more validation is required.
454 bp = &asoc->base.bind_addr;
457 /* Walk through the bind address list and look for a bind
458 * address that matches the source address of the returned dst.
460 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
462 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
463 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
464 (laddr->state != SCTP_ADDR_SRC &&
465 !asoc->src_out_of_asoc_ok))
467 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
472 /* None of the bound addresses match the source address of the
473 * dst. So release it.
479 /* Walk through the bind address list and try to get a dst that
480 * matches a bind address as the source address.
483 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
484 struct net_device *odev;
488 if (laddr->state != SCTP_ADDR_SRC ||
489 AF_INET != laddr->a.sa.sa_family)
492 fl4->fl4_sport = laddr->a.v4.sin_port;
493 flowi4_update_output(fl4,
494 asoc->base.sk->sk_bound_dev_if,
495 RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
496 daddr->v4.sin_addr.s_addr,
497 laddr->a.v4.sin_addr.s_addr);
499 rt = ip_route_output_key(sock_net(sk), fl4);
503 /* Ensure the src address belongs to the output
506 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
508 if (!odev || odev->ifindex != fl4->flowi4_oif) {
512 memcpy(fl, &_fl, sizeof(_fl));
514 dst_release(&rt->dst);
522 memcpy(fl, &_fl, sizeof(_fl));
530 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
531 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
534 pr_debug("no route\n");
538 /* For v4, the source address is cached in the route entry(dst). So no need
539 * to cache it separately and hence this is an empty routine.
541 static void sctp_v4_get_saddr(struct sctp_sock *sk,
542 struct sctp_transport *t,
545 union sctp_addr *saddr = &t->saddr;
546 struct rtable *rt = (struct rtable *)t->dst;
549 saddr->v4.sin_family = AF_INET;
550 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
554 /* What interface did this skb arrive on? */
555 static int sctp_v4_skb_iif(const struct sk_buff *skb)
557 return inet_iif(skb);
560 /* Was this packet marked by Explicit Congestion Notification? */
561 static int sctp_v4_is_ce(const struct sk_buff *skb)
563 return INET_ECN_is_ce(ip_hdr(skb)->tos);
566 /* Create and initialize a new sk for the socket returned by accept(). */
567 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
568 struct sctp_association *asoc,
571 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
573 struct inet_sock *newinet;
578 sock_init_data(NULL, newsk);
580 sctp_copy_sock(newsk, sk, asoc);
581 sock_reset_flag(newsk, SOCK_ZAPPED);
583 sctp_v4_copy_ip_options(sk, newsk);
585 newinet = inet_sk(newsk);
587 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
589 sk_refcnt_debug_inc(newsk);
591 if (newsk->sk_prot->init(newsk)) {
592 sk_common_release(newsk);
600 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
602 /* No address mapping for V4 sockets */
603 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
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(struct timer_list *t)
620 struct net *net = from_timer(net, t, sctp.addr_wq_timer);
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 = kzalloc(sizeof(*addr), GFP_ATOMIC);
782 addr->a.v4.sin_family = AF_INET;
783 addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
785 spin_lock_bh(&net->sctp.local_addr_lock);
786 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
787 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
788 spin_unlock_bh(&net->sctp.local_addr_lock);
792 spin_lock_bh(&net->sctp.local_addr_lock);
793 list_for_each_entry_safe(addr, temp,
794 &net->sctp.local_addr_list, list) {
795 if (addr->a.sa.sa_family == AF_INET &&
796 addr->a.v4.sin_addr.s_addr ==
798 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
801 list_del_rcu(&addr->list);
805 spin_unlock_bh(&net->sctp.local_addr_lock);
807 kfree_rcu(addr, rcu);
815 * Initialize the control inode/socket with a control endpoint data
816 * structure. This endpoint is reserved exclusively for the OOTB processing.
818 static int sctp_ctl_sock_init(struct net *net)
821 sa_family_t family = PF_INET;
823 if (sctp_get_pf_specific(PF_INET6))
826 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
827 SOCK_SEQPACKET, IPPROTO_SCTP, net);
829 /* If IPv6 socket could not be created, try the IPv4 socket */
830 if (err < 0 && family == PF_INET6)
831 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
832 SOCK_SEQPACKET, IPPROTO_SCTP,
836 pr_err("Failed to create the SCTP control socket\n");
842 /* Register address family specific functions. */
843 int sctp_register_af(struct sctp_af *af)
845 switch (af->sa_family) {
847 if (sctp_af_v4_specific)
849 sctp_af_v4_specific = af;
852 if (sctp_af_v6_specific)
854 sctp_af_v6_specific = af;
860 INIT_LIST_HEAD(&af->list);
861 list_add_tail(&af->list, &sctp_address_families);
865 /* Get the table of functions for manipulating a particular address
868 struct sctp_af *sctp_get_af_specific(sa_family_t family)
872 return sctp_af_v4_specific;
874 return sctp_af_v6_specific;
880 /* Common code to initialize a AF_INET msg_name. */
881 static void sctp_inet_msgname(char *msgname, int *addr_len)
883 struct sockaddr_in *sin;
885 sin = (struct sockaddr_in *)msgname;
886 *addr_len = sizeof(struct sockaddr_in);
887 sin->sin_family = AF_INET;
888 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
891 /* Copy the primary address of the peer primary address as the msg_name. */
892 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
895 struct sockaddr_in *sin, *sinfrom;
898 struct sctp_association *asoc;
901 sctp_inet_msgname(msgname, addr_len);
902 sin = (struct sockaddr_in *)msgname;
903 sinfrom = &asoc->peer.primary_addr.v4;
904 sin->sin_port = htons(asoc->peer.port);
905 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
909 /* Initialize and copy out a msgname from an inbound skb. */
910 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
913 struct sctphdr *sh = sctp_hdr(skb);
914 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
916 sctp_inet_msgname(msgname, len);
917 sin->sin_port = sh->source;
918 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
922 /* Do we support this AF? */
923 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
925 /* PF_INET only supports AF_INET addresses. */
926 return AF_INET == family;
929 /* Address matching with wildcards allowed. */
930 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
931 const union sctp_addr *addr2,
932 struct sctp_sock *opt)
934 /* PF_INET only supports AF_INET addresses. */
935 if (addr1->sa.sa_family != addr2->sa.sa_family)
937 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
938 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
940 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
946 /* Verify that provided sockaddr looks bindable. Common verification has
947 * already been taken care of.
949 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
951 return sctp_v4_available(addr, opt);
954 /* Verify that sockaddr looks sendable. Common verification has already
955 * been taken care of.
957 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
962 /* Fill in Supported Address Type information for INIT and INIT-ACK
963 * chunks. Returns number of addresses supported.
965 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
968 types[0] = SCTP_PARAM_IPV4_ADDRESS;
972 /* Wrapper routine that calls the ip transmit routine. */
973 static inline int sctp_v4_xmit(struct sk_buff *skb,
974 struct sctp_transport *transport)
976 struct inet_sock *inet = inet_sk(skb->sk);
977 __u8 dscp = inet->tos;
979 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
980 skb->len, &transport->fl.u.ip4.saddr,
981 &transport->fl.u.ip4.daddr);
983 if (transport->dscp & SCTP_DSCP_SET_MASK)
984 dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
986 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
987 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
989 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
991 return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
994 static struct sctp_af sctp_af_inet;
996 static struct sctp_pf sctp_pf_inet = {
997 .event_msgname = sctp_inet_event_msgname,
998 .skb_msgname = sctp_inet_skb_msgname,
999 .af_supported = sctp_inet_af_supported,
1000 .cmp_addr = sctp_inet_cmp_addr,
1001 .bind_verify = sctp_inet_bind_verify,
1002 .send_verify = sctp_inet_send_verify,
1003 .supported_addrs = sctp_inet_supported_addrs,
1004 .create_accept_sk = sctp_v4_create_accept_sk,
1005 .addr_to_user = sctp_v4_addr_to_user,
1006 .to_sk_saddr = sctp_v4_to_sk_saddr,
1007 .to_sk_daddr = sctp_v4_to_sk_daddr,
1008 .copy_ip_options = sctp_v4_copy_ip_options,
1012 /* Notifier for inetaddr addition/deletion events. */
1013 static struct notifier_block sctp_inetaddr_notifier = {
1014 .notifier_call = sctp_inetaddr_event,
1017 /* Socket operations. */
1018 static const struct proto_ops inet_seqpacket_ops = {
1020 .owner = THIS_MODULE,
1021 .release = inet_release, /* Needs to be wrapped... */
1023 .connect = sctp_inet_connect,
1024 .socketpair = sock_no_socketpair,
1025 .accept = inet_accept,
1026 .getname = inet_getname, /* Semantics are different. */
1028 .ioctl = inet_ioctl,
1029 .gettstamp = sock_gettstamp,
1030 .listen = sctp_inet_listen,
1031 .shutdown = inet_shutdown, /* Looks harmless. */
1032 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1033 .getsockopt = sock_common_getsockopt,
1034 .sendmsg = inet_sendmsg,
1035 .recvmsg = inet_recvmsg,
1036 .mmap = sock_no_mmap,
1037 .sendpage = sock_no_sendpage,
1038 #ifdef CONFIG_COMPAT
1039 .compat_setsockopt = compat_sock_common_setsockopt,
1040 .compat_getsockopt = compat_sock_common_getsockopt,
1044 /* Registration with AF_INET family. */
1045 static struct inet_protosw sctp_seqpacket_protosw = {
1046 .type = SOCK_SEQPACKET,
1047 .protocol = IPPROTO_SCTP,
1049 .ops = &inet_seqpacket_ops,
1050 .flags = SCTP_PROTOSW_FLAG
1052 static struct inet_protosw sctp_stream_protosw = {
1053 .type = SOCK_STREAM,
1054 .protocol = IPPROTO_SCTP,
1056 .ops = &inet_seqpacket_ops,
1057 .flags = SCTP_PROTOSW_FLAG
1060 /* Register with IP layer. */
1061 static const struct net_protocol sctp_protocol = {
1062 .handler = sctp_rcv,
1063 .err_handler = sctp_v4_err,
1066 .icmp_strict_tag_validation = 1,
1069 /* IPv4 address related functions. */
1070 static struct sctp_af sctp_af_inet = {
1071 .sa_family = AF_INET,
1072 .sctp_xmit = sctp_v4_xmit,
1073 .setsockopt = ip_setsockopt,
1074 .getsockopt = ip_getsockopt,
1075 .get_dst = sctp_v4_get_dst,
1076 .get_saddr = sctp_v4_get_saddr,
1077 .copy_addrlist = sctp_v4_copy_addrlist,
1078 .from_skb = sctp_v4_from_skb,
1079 .from_sk = sctp_v4_from_sk,
1080 .from_addr_param = sctp_v4_from_addr_param,
1081 .to_addr_param = sctp_v4_to_addr_param,
1082 .cmp_addr = sctp_v4_cmp_addr,
1083 .addr_valid = sctp_v4_addr_valid,
1084 .inaddr_any = sctp_v4_inaddr_any,
1085 .is_any = sctp_v4_is_any,
1086 .available = sctp_v4_available,
1087 .scope = sctp_v4_scope,
1088 .skb_iif = sctp_v4_skb_iif,
1089 .is_ce = sctp_v4_is_ce,
1090 .seq_dump_addr = sctp_v4_seq_dump_addr,
1091 .ecn_capable = sctp_v4_ecn_capable,
1092 .net_header_len = sizeof(struct iphdr),
1093 .sockaddr_len = sizeof(struct sockaddr_in),
1094 .ip_options_len = sctp_v4_ip_options_len,
1095 #ifdef CONFIG_COMPAT
1096 .compat_setsockopt = compat_ip_setsockopt,
1097 .compat_getsockopt = compat_ip_getsockopt,
1101 struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1105 return sctp_pf_inet_specific;
1107 return sctp_pf_inet6_specific;
1113 /* Register the PF specific function table. */
1114 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1118 if (sctp_pf_inet_specific)
1120 sctp_pf_inet_specific = pf;
1123 if (sctp_pf_inet6_specific)
1125 sctp_pf_inet6_specific = pf;
1133 static inline int init_sctp_mibs(struct net *net)
1135 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1136 if (!net->sctp.sctp_statistics)
1141 static inline void cleanup_sctp_mibs(struct net *net)
1143 free_percpu(net->sctp.sctp_statistics);
1146 static void sctp_v4_pf_init(void)
1148 /* Initialize the SCTP specific PF functions. */
1149 sctp_register_pf(&sctp_pf_inet, PF_INET);
1150 sctp_register_af(&sctp_af_inet);
1153 static void sctp_v4_pf_exit(void)
1155 list_del(&sctp_af_inet.list);
1158 static int sctp_v4_protosw_init(void)
1162 rc = proto_register(&sctp_prot, 1);
1166 /* Register SCTP(UDP and TCP style) with socket layer. */
1167 inet_register_protosw(&sctp_seqpacket_protosw);
1168 inet_register_protosw(&sctp_stream_protosw);
1173 static void sctp_v4_protosw_exit(void)
1175 inet_unregister_protosw(&sctp_stream_protosw);
1176 inet_unregister_protosw(&sctp_seqpacket_protosw);
1177 proto_unregister(&sctp_prot);
1180 static int sctp_v4_add_protocol(void)
1182 /* Register notifier for inet address additions/deletions. */
1183 register_inetaddr_notifier(&sctp_inetaddr_notifier);
1185 /* Register SCTP with inet layer. */
1186 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1192 static void sctp_v4_del_protocol(void)
1194 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1195 unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1198 static int __net_init sctp_defaults_init(struct net *net)
1203 * 14. Suggested SCTP Protocol Parameter Values
1205 /* The following protocol parameters are RECOMMENDED: */
1206 /* RTO.Initial - 3 seconds */
1207 net->sctp.rto_initial = SCTP_RTO_INITIAL;
1208 /* RTO.Min - 1 second */
1209 net->sctp.rto_min = SCTP_RTO_MIN;
1210 /* RTO.Max - 60 seconds */
1211 net->sctp.rto_max = SCTP_RTO_MAX;
1212 /* RTO.Alpha - 1/8 */
1213 net->sctp.rto_alpha = SCTP_RTO_ALPHA;
1214 /* RTO.Beta - 1/4 */
1215 net->sctp.rto_beta = SCTP_RTO_BETA;
1217 /* Valid.Cookie.Life - 60 seconds */
1218 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE;
1220 /* Whether Cookie Preservative is enabled(1) or not(0) */
1221 net->sctp.cookie_preserve_enable = 1;
1223 /* Default sctp sockets to use md5 as their hmac alg */
1224 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1225 net->sctp.sctp_hmac_alg = "md5";
1226 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1227 net->sctp.sctp_hmac_alg = "sha1";
1229 net->sctp.sctp_hmac_alg = NULL;
1233 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST;
1235 /* Enable pf state by default */
1236 net->sctp.pf_enable = 1;
1238 /* Association.Max.Retrans - 10 attempts
1239 * Path.Max.Retrans - 5 attempts (per destination address)
1240 * Max.Init.Retransmits - 8 attempts
1242 net->sctp.max_retrans_association = 10;
1243 net->sctp.max_retrans_path = 5;
1244 net->sctp.max_retrans_init = 8;
1246 /* Sendbuffer growth - do per-socket accounting */
1247 net->sctp.sndbuf_policy = 0;
1249 /* Rcvbuffer growth - do per-socket accounting */
1250 net->sctp.rcvbuf_policy = 0;
1252 /* HB.interval - 30 seconds */
1253 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1255 /* delayed SACK timeout */
1256 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK;
1258 /* Disable ADDIP by default. */
1259 net->sctp.addip_enable = 0;
1260 net->sctp.addip_noauth = 0;
1261 net->sctp.default_auto_asconf = 0;
1263 /* Enable PR-SCTP by default. */
1264 net->sctp.prsctp_enable = 1;
1266 /* Disable RECONF by default. */
1267 net->sctp.reconf_enable = 0;
1269 /* Disable AUTH by default. */
1270 net->sctp.auth_enable = 0;
1272 /* Enable ECN by default. */
1273 net->sctp.ecn_enable = 1;
1275 /* Set SCOPE policy to enabled */
1276 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1278 /* Set the default rwnd update threshold */
1279 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1281 /* Initialize maximum autoclose timeout. */
1282 net->sctp.max_autoclose = INT_MAX / HZ;
1284 status = sctp_sysctl_net_register(net);
1286 goto err_sysctl_register;
1288 /* Allocate and initialise sctp mibs. */
1289 status = init_sctp_mibs(net);
1293 #ifdef CONFIG_PROC_FS
1294 /* Initialize proc fs directory. */
1295 status = sctp_proc_init(net);
1300 sctp_dbg_objcnt_init(net);
1302 /* Initialize the local address list. */
1303 INIT_LIST_HEAD(&net->sctp.local_addr_list);
1304 spin_lock_init(&net->sctp.local_addr_lock);
1305 sctp_get_local_addr_list(net);
1307 /* Initialize the address event list */
1308 INIT_LIST_HEAD(&net->sctp.addr_waitq);
1309 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1310 spin_lock_init(&net->sctp.addr_wq_lock);
1311 net->sctp.addr_wq_timer.expires = 0;
1312 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1316 #ifdef CONFIG_PROC_FS
1318 cleanup_sctp_mibs(net);
1321 sctp_sysctl_net_unregister(net);
1322 err_sysctl_register:
1326 static void __net_exit sctp_defaults_exit(struct net *net)
1328 /* Free the local address list */
1329 sctp_free_addr_wq(net);
1330 sctp_free_local_addr_list(net);
1332 #ifdef CONFIG_PROC_FS
1333 remove_proc_subtree("sctp", net->proc_net);
1334 net->sctp.proc_net_sctp = NULL;
1336 cleanup_sctp_mibs(net);
1337 sctp_sysctl_net_unregister(net);
1340 static struct pernet_operations sctp_defaults_ops = {
1341 .init = sctp_defaults_init,
1342 .exit = sctp_defaults_exit,
1345 static int __net_init sctp_ctrlsock_init(struct net *net)
1349 /* Initialize the control inode/socket for handling OOTB packets. */
1350 status = sctp_ctl_sock_init(net);
1352 pr_err("Failed to initialize the SCTP control sock\n");
1357 static void __net_exit sctp_ctrlsock_exit(struct net *net)
1359 /* Free the control endpoint. */
1360 inet_ctl_sock_destroy(net->sctp.ctl_sock);
1363 static struct pernet_operations sctp_ctrlsock_ops = {
1364 .init = sctp_ctrlsock_init,
1365 .exit = sctp_ctrlsock_exit,
1368 /* Initialize the universe into something sensible. */
1369 static __init int sctp_init(void)
1372 int status = -EINVAL;
1374 unsigned long limit;
1375 unsigned long nr_pages = totalram_pages();
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 (nr_pages >= (128 * 1024))
1435 goal = nr_pages >> (22 - PAGE_SHIFT);
1437 goal = nr_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");