1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
29 * Please send any bug reports or fixes you make to the
31 * lksctp developers <linux-sctp@vger.kernel.org>
33 * Written or modified by:
34 * La Monte H.P. Yarroll <piggy@acm.org>
35 * Karl Knutson <karl@athena.chicago.il.us>
36 * Jon Grimm <jgrimm@us.ibm.com>
37 * Sridhar Samudrala <sri@us.ibm.com>
38 * Daisy Chang <daisyc@us.ibm.com>
39 * Ardelle Fan <ardelle.fan@intel.com>
42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
44 #include <linux/module.h>
45 #include <linux/init.h>
46 #include <linux/netdevice.h>
47 #include <linux/inetdevice.h>
48 #include <linux/seq_file.h>
49 #include <linux/bootmem.h>
50 #include <linux/highmem.h>
51 #include <linux/swap.h>
52 #include <linux/slab.h>
53 #include <net/net_namespace.h>
54 #include <net/protocol.h>
57 #include <net/route.h>
58 #include <net/sctp/sctp.h>
59 #include <net/addrconf.h>
60 #include <net/inet_common.h>
61 #include <net/inet_ecn.h>
63 /* Global data structures. */
64 struct sctp_globals sctp_globals __read_mostly
;
66 struct idr sctp_assocs_id
;
67 DEFINE_SPINLOCK(sctp_assocs_id_lock
);
69 static struct sctp_pf
*sctp_pf_inet6_specific
;
70 static struct sctp_pf
*sctp_pf_inet_specific
;
71 static struct sctp_af
*sctp_af_v4_specific
;
72 static struct sctp_af
*sctp_af_v6_specific
;
74 struct kmem_cache
*sctp_chunk_cachep __read_mostly
;
75 struct kmem_cache
*sctp_bucket_cachep __read_mostly
;
77 long sysctl_sctp_mem
[3];
78 int sysctl_sctp_rmem
[3];
79 int sysctl_sctp_wmem
[3];
81 /* Set up the proc fs entry for the SCTP protocol. */
82 static int __net_init
sctp_proc_init(struct net
*net
)
85 net
->sctp
.proc_net_sctp
= proc_net_mkdir(net
, "sctp", net
->proc_net
);
86 if (!net
->sctp
.proc_net_sctp
)
87 goto out_proc_net_sctp
;
88 if (sctp_snmp_proc_init(net
))
89 goto out_snmp_proc_init
;
90 if (sctp_eps_proc_init(net
))
91 goto out_eps_proc_init
;
92 if (sctp_assocs_proc_init(net
))
93 goto out_assocs_proc_init
;
94 if (sctp_remaddr_proc_init(net
))
95 goto out_remaddr_proc_init
;
99 out_remaddr_proc_init
:
100 sctp_assocs_proc_exit(net
);
101 out_assocs_proc_init
:
102 sctp_eps_proc_exit(net
);
104 sctp_snmp_proc_exit(net
);
106 remove_proc_entry("sctp", net
->proc_net
);
107 net
->sctp
.proc_net_sctp
= NULL
;
110 #endif /* CONFIG_PROC_FS */
114 /* Clean up the proc fs entry for the SCTP protocol.
115 * Note: Do not make this __exit as it is used in the init error
118 static void sctp_proc_exit(struct net
*net
)
120 #ifdef CONFIG_PROC_FS
121 sctp_snmp_proc_exit(net
);
122 sctp_eps_proc_exit(net
);
123 sctp_assocs_proc_exit(net
);
124 sctp_remaddr_proc_exit(net
);
126 remove_proc_entry("sctp", net
->proc_net
);
127 net
->sctp
.proc_net_sctp
= NULL
;
131 /* Private helper to extract ipv4 address and stash them in
132 * the protocol structure.
134 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
135 struct net_device
*dev
)
137 struct in_device
*in_dev
;
138 struct in_ifaddr
*ifa
;
139 struct sctp_sockaddr_entry
*addr
;
142 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
147 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
148 /* Add the address to the local list. */
149 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
151 addr
->a
.v4
.sin_family
= AF_INET
;
152 addr
->a
.v4
.sin_port
= 0;
153 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
155 INIT_LIST_HEAD(&addr
->list
);
156 list_add_tail(&addr
->list
, addrlist
);
163 /* Extract our IP addresses from the system and stash them in the
164 * protocol structure.
166 static void sctp_get_local_addr_list(struct net
*net
)
168 struct net_device
*dev
;
169 struct list_head
*pos
;
173 for_each_netdev_rcu(net
, dev
) {
174 list_for_each(pos
, &sctp_address_families
) {
175 af
= list_entry(pos
, struct sctp_af
, list
);
176 af
->copy_addrlist(&net
->sctp
.local_addr_list
, dev
);
182 /* Free the existing local addresses. */
183 static void sctp_free_local_addr_list(struct net
*net
)
185 struct sctp_sockaddr_entry
*addr
;
186 struct list_head
*pos
, *temp
;
188 list_for_each_safe(pos
, temp
, &net
->sctp
.local_addr_list
) {
189 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
195 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
196 int sctp_copy_local_addr_list(struct net
*net
, struct sctp_bind_addr
*bp
,
197 sctp_scope_t scope
, gfp_t gfp
, int copy_flags
)
199 struct sctp_sockaddr_entry
*addr
;
203 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
206 if (sctp_in_scope(net
, &addr
->a
, scope
)) {
207 /* Now that the address is in scope, check to see if
208 * the address type is really supported by the local
209 * sock as well as the remote peer.
211 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
212 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
213 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
214 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
215 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
216 error
= sctp_add_bind_addr(bp
, &addr
->a
,
217 SCTP_ADDR_SRC
, GFP_ATOMIC
);
229 /* Initialize a sctp_addr from in incoming skb. */
230 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
237 port
= &addr
->v4
.sin_port
;
238 addr
->v4
.sin_family
= AF_INET
;
243 from
= &ip_hdr(skb
)->saddr
;
246 from
= &ip_hdr(skb
)->daddr
;
248 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
251 /* Initialize an sctp_addr from a socket. */
252 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
254 addr
->v4
.sin_family
= AF_INET
;
255 addr
->v4
.sin_port
= 0;
256 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->inet_rcv_saddr
;
259 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
260 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
262 inet_sk(sk
)->inet_rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
265 /* Initialize sk->sk_daddr from sctp_addr. */
266 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
268 inet_sk(sk
)->inet_daddr
= addr
->v4
.sin_addr
.s_addr
;
271 /* Initialize a sctp_addr from an address parameter. */
272 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
273 union sctp_addr_param
*param
,
274 __be16 port
, int iif
)
276 addr
->v4
.sin_family
= AF_INET
;
277 addr
->v4
.sin_port
= port
;
278 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
281 /* Initialize an address parameter from a sctp_addr and return the length
282 * of the address parameter.
284 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
285 union sctp_addr_param
*param
)
287 int length
= sizeof(sctp_ipv4addr_param_t
);
289 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
290 param
->v4
.param_hdr
.length
= htons(length
);
291 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
296 /* Initialize a sctp_addr from a dst_entry. */
297 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct flowi4
*fl4
,
300 saddr
->v4
.sin_family
= AF_INET
;
301 saddr
->v4
.sin_port
= port
;
302 saddr
->v4
.sin_addr
.s_addr
= fl4
->saddr
;
305 /* Compare two addresses exactly. */
306 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
307 const union sctp_addr
*addr2
)
309 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
311 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
313 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
319 /* Initialize addr struct to INADDR_ANY. */
320 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, __be16 port
)
322 addr
->v4
.sin_family
= AF_INET
;
323 addr
->v4
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
324 addr
->v4
.sin_port
= port
;
327 /* Is this a wildcard address? */
328 static int sctp_v4_is_any(const union sctp_addr
*addr
)
330 return htonl(INADDR_ANY
) == addr
->v4
.sin_addr
.s_addr
;
333 /* This function checks if the address is a valid address to be used for
337 * Return 0 - If the address is a non-unicast or an illegal address.
338 * Return 1 - If the address is a unicast.
340 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
341 struct sctp_sock
*sp
,
342 const struct sk_buff
*skb
)
344 /* IPv4 addresses not allowed */
345 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
348 /* Is this a non-unicast address or a unusable SCTP address? */
349 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
))
352 /* Is this a broadcast address? */
353 if (skb
&& skb_rtable(skb
)->rt_flags
& RTCF_BROADCAST
)
359 /* Should this be available for binding? */
360 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
362 struct net
*net
= sock_net(&sp
->inet
.sk
);
363 int ret
= inet_addr_type(net
, addr
->v4
.sin_addr
.s_addr
);
366 if (addr
->v4
.sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
368 !sp
->inet
.freebind
&&
369 !net
->ipv4
.sysctl_ip_nonlocal_bind
)
372 if (ipv6_only_sock(sctp_opt2sk(sp
)))
378 /* Checking the loopback, private and other address scopes as defined in
379 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
380 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
382 * Level 0 - unusable SCTP addresses
383 * Level 1 - loopback address
384 * Level 2 - link-local addresses
385 * Level 3 - private addresses.
386 * Level 4 - global addresses
387 * For INIT and INIT-ACK address list, let L be the level of
388 * of requested destination address, sender and receiver
389 * SHOULD include all of its addresses with level greater
390 * than or equal to L.
392 * IPv4 scoping can be controlled through sysctl option
393 * net.sctp.addr_scope_policy
395 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
399 /* Check for unusable SCTP addresses. */
400 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
)) {
401 retval
= SCTP_SCOPE_UNUSABLE
;
402 } else if (ipv4_is_loopback(addr
->v4
.sin_addr
.s_addr
)) {
403 retval
= SCTP_SCOPE_LOOPBACK
;
404 } else if (ipv4_is_linklocal_169(addr
->v4
.sin_addr
.s_addr
)) {
405 retval
= SCTP_SCOPE_LINK
;
406 } else if (ipv4_is_private_10(addr
->v4
.sin_addr
.s_addr
) ||
407 ipv4_is_private_172(addr
->v4
.sin_addr
.s_addr
) ||
408 ipv4_is_private_192(addr
->v4
.sin_addr
.s_addr
)) {
409 retval
= SCTP_SCOPE_PRIVATE
;
411 retval
= SCTP_SCOPE_GLOBAL
;
417 /* Returns a valid dst cache entry for the given source and destination ip
418 * addresses. If an association is passed, trys to get a dst entry with a
419 * source address that matches an address in the bind address list.
421 static void sctp_v4_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
422 struct flowi
*fl
, struct sock
*sk
)
424 struct sctp_association
*asoc
= t
->asoc
;
426 struct flowi4
*fl4
= &fl
->u
.ip4
;
427 struct sctp_bind_addr
*bp
;
428 struct sctp_sockaddr_entry
*laddr
;
429 struct dst_entry
*dst
= NULL
;
430 union sctp_addr
*daddr
= &t
->ipaddr
;
431 union sctp_addr dst_saddr
;
433 memset(fl4
, 0x0, sizeof(struct flowi4
));
434 fl4
->daddr
= daddr
->v4
.sin_addr
.s_addr
;
435 fl4
->fl4_dport
= daddr
->v4
.sin_port
;
436 fl4
->flowi4_proto
= IPPROTO_SCTP
;
438 fl4
->flowi4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
439 fl4
->flowi4_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
440 fl4
->fl4_sport
= htons(asoc
->base
.bind_addr
.port
);
443 fl4
->saddr
= saddr
->v4
.sin_addr
.s_addr
;
444 fl4
->fl4_sport
= saddr
->v4
.sin_port
;
447 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__
, &fl4
->daddr
,
450 rt
= ip_route_output_key(sock_net(sk
), fl4
);
454 /* If there is no association or if a source address is passed, no
455 * more validation is required.
460 bp
= &asoc
->base
.bind_addr
;
463 /* Walk through the bind address list and look for a bind
464 * address that matches the source address of the returned dst.
466 sctp_v4_dst_saddr(&dst_saddr
, fl4
, htons(bp
->port
));
468 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
469 if (!laddr
->valid
|| (laddr
->state
== SCTP_ADDR_DEL
) ||
470 (laddr
->state
!= SCTP_ADDR_SRC
&&
471 !asoc
->src_out_of_asoc_ok
))
473 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
478 /* None of the bound addresses match the source address of the
479 * dst. So release it.
485 /* Walk through the bind address list and try to get a dst that
486 * matches a bind address as the source address.
489 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
492 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
493 (AF_INET
== laddr
->a
.sa
.sa_family
)) {
494 fl4
->fl4_sport
= laddr
->a
.v4
.sin_port
;
495 flowi4_update_output(fl4
,
496 asoc
->base
.sk
->sk_bound_dev_if
,
497 RT_CONN_FLAGS(asoc
->base
.sk
),
498 daddr
->v4
.sin_addr
.s_addr
,
499 laddr
->a
.v4
.sin_addr
.s_addr
);
501 rt
= ip_route_output_key(sock_net(sk
), fl4
);
514 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
515 &fl4
->daddr
, &fl4
->saddr
);
517 pr_debug("no route\n");
520 /* For v4, the source address is cached in the route entry(dst). So no need
521 * to cache it separately and hence this is an empty routine.
523 static void sctp_v4_get_saddr(struct sctp_sock
*sk
,
524 struct sctp_transport
*t
,
527 union sctp_addr
*saddr
= &t
->saddr
;
528 struct rtable
*rt
= (struct rtable
*)t
->dst
;
531 saddr
->v4
.sin_family
= AF_INET
;
532 saddr
->v4
.sin_addr
.s_addr
= fl
->u
.ip4
.saddr
;
536 /* What interface did this skb arrive on? */
537 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
539 return inet_iif(skb
);
542 /* Was this packet marked by Explicit Congestion Notification? */
543 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
545 return INET_ECN_is_ce(ip_hdr(skb
)->tos
);
548 /* Create and initialize a new sk for the socket returned by accept(). */
549 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
550 struct sctp_association
*asoc
)
552 struct sock
*newsk
= sk_alloc(sock_net(sk
), PF_INET
, GFP_KERNEL
,
554 struct inet_sock
*newinet
;
559 sock_init_data(NULL
, newsk
);
561 sctp_copy_sock(newsk
, sk
, asoc
);
562 sock_reset_flag(newsk
, SOCK_ZAPPED
);
564 newinet
= inet_sk(newsk
);
566 newinet
->inet_daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
568 sk_refcnt_debug_inc(newsk
);
570 if (newsk
->sk_prot
->init(newsk
)) {
571 sk_common_release(newsk
);
579 static int sctp_v4_addr_to_user(struct sctp_sock
*sp
, union sctp_addr
*addr
)
581 /* No address mapping for V4 sockets */
582 return sizeof(struct sockaddr_in
);
585 /* Dump the v4 addr to the seq file. */
586 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
588 seq_printf(seq
, "%pI4 ", &addr
->v4
.sin_addr
);
591 static void sctp_v4_ecn_capable(struct sock
*sk
)
596 static void sctp_addr_wq_timeout_handler(unsigned long arg
)
598 struct net
*net
= (struct net
*)arg
;
599 struct sctp_sockaddr_entry
*addrw
, *temp
;
600 struct sctp_sock
*sp
;
602 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
604 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
605 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
606 "entry:%p\n", __func__
, &net
->sctp
.addr_waitq
, &addrw
->a
.sa
,
607 addrw
->state
, addrw
);
609 #if IS_ENABLED(CONFIG_IPV6)
610 /* Now we send an ASCONF for each association */
611 /* Note. we currently don't handle link local IPv6 addressees */
612 if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
613 struct in6_addr
*in6
;
615 if (ipv6_addr_type(&addrw
->a
.v6
.sin6_addr
) &
619 in6
= (struct in6_addr
*)&addrw
->a
.v6
.sin6_addr
;
620 if (ipv6_chk_addr(net
, in6
, NULL
, 0) == 0 &&
621 addrw
->state
== SCTP_ADDR_NEW
) {
622 unsigned long timeo_val
;
624 pr_debug("%s: this is on DAD, trying %d sec "
626 SCTP_ADDRESS_TICK_DELAY
);
629 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
630 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
635 list_for_each_entry(sp
, &net
->sctp
.auto_asconf_splist
, auto_asconf_list
) {
638 sk
= sctp_opt2sk(sp
);
639 /* ignore bound-specific endpoints */
640 if (!sctp_is_ep_boundall(sk
))
643 if (sctp_asconf_mgmt(sp
, addrw
) < 0)
644 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__
);
647 #if IS_ENABLED(CONFIG_IPV6)
650 list_del(&addrw
->list
);
653 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
656 static void sctp_free_addr_wq(struct net
*net
)
658 struct sctp_sockaddr_entry
*addrw
;
659 struct sctp_sockaddr_entry
*temp
;
661 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
662 del_timer(&net
->sctp
.addr_wq_timer
);
663 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
664 list_del(&addrw
->list
);
667 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
670 /* lookup the entry for the same address in the addr_waitq
671 * sctp_addr_wq MUST be locked
673 static struct sctp_sockaddr_entry
*sctp_addr_wq_lookup(struct net
*net
,
674 struct sctp_sockaddr_entry
*addr
)
676 struct sctp_sockaddr_entry
*addrw
;
678 list_for_each_entry(addrw
, &net
->sctp
.addr_waitq
, list
) {
679 if (addrw
->a
.sa
.sa_family
!= addr
->a
.sa
.sa_family
)
681 if (addrw
->a
.sa
.sa_family
== AF_INET
) {
682 if (addrw
->a
.v4
.sin_addr
.s_addr
==
683 addr
->a
.v4
.sin_addr
.s_addr
)
685 } else if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
686 if (ipv6_addr_equal(&addrw
->a
.v6
.sin6_addr
,
687 &addr
->a
.v6
.sin6_addr
))
694 void sctp_addr_wq_mgmt(struct net
*net
, struct sctp_sockaddr_entry
*addr
, int cmd
)
696 struct sctp_sockaddr_entry
*addrw
;
697 unsigned long timeo_val
;
699 /* first, we check if an opposite message already exist in the queue.
700 * If we found such message, it is removed.
701 * This operation is a bit stupid, but the DHCP client attaches the
702 * new address after a couple of addition and deletion of that address
705 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
706 /* Offsets existing events in addr_wq */
707 addrw
= sctp_addr_wq_lookup(net
, addr
);
709 if (addrw
->state
!= cmd
) {
710 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
711 "in wq:%p\n", __func__
, addrw
->state
, &addrw
->a
.sa
,
712 &net
->sctp
.addr_waitq
);
714 list_del(&addrw
->list
);
717 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
721 /* OK, we have to add the new address to the wait queue */
722 addrw
= kmemdup(addr
, sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
724 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
728 list_add_tail(&addrw
->list
, &net
->sctp
.addr_waitq
);
730 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
731 __func__
, addrw
->state
, &addrw
->a
.sa
, &net
->sctp
.addr_waitq
);
733 if (!timer_pending(&net
->sctp
.addr_wq_timer
)) {
735 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
736 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
738 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
741 /* Event handler for inet address addition/deletion events.
742 * The sctp_local_addr_list needs to be protocted by a spin lock since
743 * multiple notifiers (say IPv4 and IPv6) may be running at the same
744 * time and thus corrupt the list.
745 * The reader side is protected with RCU.
747 static int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
750 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
751 struct sctp_sockaddr_entry
*addr
= NULL
;
752 struct sctp_sockaddr_entry
*temp
;
753 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
758 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
760 addr
->a
.v4
.sin_family
= AF_INET
;
761 addr
->a
.v4
.sin_port
= 0;
762 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
764 spin_lock_bh(&net
->sctp
.local_addr_lock
);
765 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
766 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
767 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
771 spin_lock_bh(&net
->sctp
.local_addr_lock
);
772 list_for_each_entry_safe(addr
, temp
,
773 &net
->sctp
.local_addr_list
, list
) {
774 if (addr
->a
.sa
.sa_family
== AF_INET
&&
775 addr
->a
.v4
.sin_addr
.s_addr
==
777 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
780 list_del_rcu(&addr
->list
);
784 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
786 kfree_rcu(addr
, rcu
);
794 * Initialize the control inode/socket with a control endpoint data
795 * structure. This endpoint is reserved exclusively for the OOTB processing.
797 static int sctp_ctl_sock_init(struct net
*net
)
800 sa_family_t family
= PF_INET
;
802 if (sctp_get_pf_specific(PF_INET6
))
805 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, family
,
806 SOCK_SEQPACKET
, IPPROTO_SCTP
, net
);
808 /* If IPv6 socket could not be created, try the IPv4 socket */
809 if (err
< 0 && family
== PF_INET6
)
810 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, AF_INET
,
811 SOCK_SEQPACKET
, IPPROTO_SCTP
,
815 pr_err("Failed to create the SCTP control socket\n");
821 /* Register address family specific functions. */
822 int sctp_register_af(struct sctp_af
*af
)
824 switch (af
->sa_family
) {
826 if (sctp_af_v4_specific
)
828 sctp_af_v4_specific
= af
;
831 if (sctp_af_v6_specific
)
833 sctp_af_v6_specific
= af
;
839 INIT_LIST_HEAD(&af
->list
);
840 list_add_tail(&af
->list
, &sctp_address_families
);
844 /* Get the table of functions for manipulating a particular address
847 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
851 return sctp_af_v4_specific
;
853 return sctp_af_v6_specific
;
859 /* Common code to initialize a AF_INET msg_name. */
860 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
862 struct sockaddr_in
*sin
;
864 sin
= (struct sockaddr_in
*)msgname
;
865 *addr_len
= sizeof(struct sockaddr_in
);
866 sin
->sin_family
= AF_INET
;
867 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
870 /* Copy the primary address of the peer primary address as the msg_name. */
871 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
874 struct sockaddr_in
*sin
, *sinfrom
;
877 struct sctp_association
*asoc
;
880 sctp_inet_msgname(msgname
, addr_len
);
881 sin
= (struct sockaddr_in
*)msgname
;
882 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
883 sin
->sin_port
= htons(asoc
->peer
.port
);
884 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
888 /* Initialize and copy out a msgname from an inbound skb. */
889 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
892 struct sctphdr
*sh
= sctp_hdr(skb
);
893 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msgname
;
895 sctp_inet_msgname(msgname
, len
);
896 sin
->sin_port
= sh
->source
;
897 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
901 /* Do we support this AF? */
902 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
904 /* PF_INET only supports AF_INET addresses. */
905 return AF_INET
== family
;
908 /* Address matching with wildcards allowed. */
909 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
910 const union sctp_addr
*addr2
,
911 struct sctp_sock
*opt
)
913 /* PF_INET only supports AF_INET addresses. */
914 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
916 if (htonl(INADDR_ANY
) == addr1
->v4
.sin_addr
.s_addr
||
917 htonl(INADDR_ANY
) == addr2
->v4
.sin_addr
.s_addr
)
919 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
925 /* Verify that provided sockaddr looks bindable. Common verification has
926 * already been taken care of.
928 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
930 return sctp_v4_available(addr
, opt
);
933 /* Verify that sockaddr looks sendable. Common verification has already
934 * been taken care of.
936 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
941 /* Fill in Supported Address Type information for INIT and INIT-ACK
942 * chunks. Returns number of addresses supported.
944 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
947 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
951 /* Wrapper routine that calls the ip transmit routine. */
952 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
953 struct sctp_transport
*transport
)
955 struct inet_sock
*inet
= inet_sk(skb
->sk
);
957 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__
, skb
,
958 skb
->len
, &transport
->fl
.u
.ip4
.saddr
, &transport
->fl
.u
.ip4
.daddr
);
960 inet
->pmtudisc
= transport
->param_flags
& SPP_PMTUD_ENABLE
?
961 IP_PMTUDISC_DO
: IP_PMTUDISC_DONT
;
963 SCTP_INC_STATS(sock_net(&inet
->sk
), SCTP_MIB_OUTSCTPPACKS
);
965 return ip_queue_xmit(&inet
->sk
, skb
, &transport
->fl
);
968 static struct sctp_af sctp_af_inet
;
970 static struct sctp_pf sctp_pf_inet
= {
971 .event_msgname
= sctp_inet_event_msgname
,
972 .skb_msgname
= sctp_inet_skb_msgname
,
973 .af_supported
= sctp_inet_af_supported
,
974 .cmp_addr
= sctp_inet_cmp_addr
,
975 .bind_verify
= sctp_inet_bind_verify
,
976 .send_verify
= sctp_inet_send_verify
,
977 .supported_addrs
= sctp_inet_supported_addrs
,
978 .create_accept_sk
= sctp_v4_create_accept_sk
,
979 .addr_to_user
= sctp_v4_addr_to_user
,
980 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
981 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
985 /* Notifier for inetaddr addition/deletion events. */
986 static struct notifier_block sctp_inetaddr_notifier
= {
987 .notifier_call
= sctp_inetaddr_event
,
990 /* Socket operations. */
991 static const struct proto_ops inet_seqpacket_ops
= {
993 .owner
= THIS_MODULE
,
994 .release
= inet_release
, /* Needs to be wrapped... */
996 .connect
= inet_dgram_connect
,
997 .socketpair
= sock_no_socketpair
,
998 .accept
= inet_accept
,
999 .getname
= inet_getname
, /* Semantics are different. */
1001 .ioctl
= inet_ioctl
,
1002 .listen
= sctp_inet_listen
,
1003 .shutdown
= inet_shutdown
, /* Looks harmless. */
1004 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem */
1005 .getsockopt
= sock_common_getsockopt
,
1006 .sendmsg
= inet_sendmsg
,
1007 .recvmsg
= sock_common_recvmsg
,
1008 .mmap
= sock_no_mmap
,
1009 .sendpage
= sock_no_sendpage
,
1010 #ifdef CONFIG_COMPAT
1011 .compat_setsockopt
= compat_sock_common_setsockopt
,
1012 .compat_getsockopt
= compat_sock_common_getsockopt
,
1016 /* Registration with AF_INET family. */
1017 static struct inet_protosw sctp_seqpacket_protosw
= {
1018 .type
= SOCK_SEQPACKET
,
1019 .protocol
= IPPROTO_SCTP
,
1021 .ops
= &inet_seqpacket_ops
,
1022 .flags
= SCTP_PROTOSW_FLAG
1024 static struct inet_protosw sctp_stream_protosw
= {
1025 .type
= SOCK_STREAM
,
1026 .protocol
= IPPROTO_SCTP
,
1028 .ops
= &inet_seqpacket_ops
,
1029 .flags
= SCTP_PROTOSW_FLAG
1032 /* Register with IP layer. */
1033 static const struct net_protocol sctp_protocol
= {
1034 .handler
= sctp_rcv
,
1035 .err_handler
= sctp_v4_err
,
1038 .icmp_strict_tag_validation
= 1,
1041 /* IPv4 address related functions. */
1042 static struct sctp_af sctp_af_inet
= {
1043 .sa_family
= AF_INET
,
1044 .sctp_xmit
= sctp_v4_xmit
,
1045 .setsockopt
= ip_setsockopt
,
1046 .getsockopt
= ip_getsockopt
,
1047 .get_dst
= sctp_v4_get_dst
,
1048 .get_saddr
= sctp_v4_get_saddr
,
1049 .copy_addrlist
= sctp_v4_copy_addrlist
,
1050 .from_skb
= sctp_v4_from_skb
,
1051 .from_sk
= sctp_v4_from_sk
,
1052 .from_addr_param
= sctp_v4_from_addr_param
,
1053 .to_addr_param
= sctp_v4_to_addr_param
,
1054 .cmp_addr
= sctp_v4_cmp_addr
,
1055 .addr_valid
= sctp_v4_addr_valid
,
1056 .inaddr_any
= sctp_v4_inaddr_any
,
1057 .is_any
= sctp_v4_is_any
,
1058 .available
= sctp_v4_available
,
1059 .scope
= sctp_v4_scope
,
1060 .skb_iif
= sctp_v4_skb_iif
,
1061 .is_ce
= sctp_v4_is_ce
,
1062 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
1063 .ecn_capable
= sctp_v4_ecn_capable
,
1064 .net_header_len
= sizeof(struct iphdr
),
1065 .sockaddr_len
= sizeof(struct sockaddr_in
),
1066 #ifdef CONFIG_COMPAT
1067 .compat_setsockopt
= compat_ip_setsockopt
,
1068 .compat_getsockopt
= compat_ip_getsockopt
,
1072 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
)
1076 return sctp_pf_inet_specific
;
1078 return sctp_pf_inet6_specific
;
1084 /* Register the PF specific function table. */
1085 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
1089 if (sctp_pf_inet_specific
)
1091 sctp_pf_inet_specific
= pf
;
1094 if (sctp_pf_inet6_specific
)
1096 sctp_pf_inet6_specific
= pf
;
1104 static inline int init_sctp_mibs(struct net
*net
)
1106 net
->sctp
.sctp_statistics
= alloc_percpu(struct sctp_mib
);
1107 if (!net
->sctp
.sctp_statistics
)
1112 static inline void cleanup_sctp_mibs(struct net
*net
)
1114 free_percpu(net
->sctp
.sctp_statistics
);
1117 static void sctp_v4_pf_init(void)
1119 /* Initialize the SCTP specific PF functions. */
1120 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1121 sctp_register_af(&sctp_af_inet
);
1124 static void sctp_v4_pf_exit(void)
1126 list_del(&sctp_af_inet
.list
);
1129 static int sctp_v4_protosw_init(void)
1133 rc
= proto_register(&sctp_prot
, 1);
1137 /* Register SCTP(UDP and TCP style) with socket layer. */
1138 inet_register_protosw(&sctp_seqpacket_protosw
);
1139 inet_register_protosw(&sctp_stream_protosw
);
1144 static void sctp_v4_protosw_exit(void)
1146 inet_unregister_protosw(&sctp_stream_protosw
);
1147 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1148 proto_unregister(&sctp_prot
);
1151 static int sctp_v4_add_protocol(void)
1153 /* Register notifier for inet address additions/deletions. */
1154 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1156 /* Register SCTP with inet layer. */
1157 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0)
1163 static void sctp_v4_del_protocol(void)
1165 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1166 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1169 static int __net_init
sctp_net_init(struct net
*net
)
1174 * 14. Suggested SCTP Protocol Parameter Values
1176 /* The following protocol parameters are RECOMMENDED: */
1177 /* RTO.Initial - 3 seconds */
1178 net
->sctp
.rto_initial
= SCTP_RTO_INITIAL
;
1179 /* RTO.Min - 1 second */
1180 net
->sctp
.rto_min
= SCTP_RTO_MIN
;
1181 /* RTO.Max - 60 seconds */
1182 net
->sctp
.rto_max
= SCTP_RTO_MAX
;
1183 /* RTO.Alpha - 1/8 */
1184 net
->sctp
.rto_alpha
= SCTP_RTO_ALPHA
;
1185 /* RTO.Beta - 1/4 */
1186 net
->sctp
.rto_beta
= SCTP_RTO_BETA
;
1188 /* Valid.Cookie.Life - 60 seconds */
1189 net
->sctp
.valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1191 /* Whether Cookie Preservative is enabled(1) or not(0) */
1192 net
->sctp
.cookie_preserve_enable
= 1;
1194 /* Default sctp sockets to use md5 as their hmac alg */
1195 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1196 net
->sctp
.sctp_hmac_alg
= "md5";
1197 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1198 net
->sctp
.sctp_hmac_alg
= "sha1";
1200 net
->sctp
.sctp_hmac_alg
= NULL
;
1204 net
->sctp
.max_burst
= SCTP_DEFAULT_MAX_BURST
;
1206 /* Association.Max.Retrans - 10 attempts
1207 * Path.Max.Retrans - 5 attempts (per destination address)
1208 * Max.Init.Retransmits - 8 attempts
1210 net
->sctp
.max_retrans_association
= 10;
1211 net
->sctp
.max_retrans_path
= 5;
1212 net
->sctp
.max_retrans_init
= 8;
1214 /* Sendbuffer growth - do per-socket accounting */
1215 net
->sctp
.sndbuf_policy
= 0;
1217 /* Rcvbuffer growth - do per-socket accounting */
1218 net
->sctp
.rcvbuf_policy
= 0;
1220 /* HB.interval - 30 seconds */
1221 net
->sctp
.hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1223 /* delayed SACK timeout */
1224 net
->sctp
.sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1226 /* Disable ADDIP by default. */
1227 net
->sctp
.addip_enable
= 0;
1228 net
->sctp
.addip_noauth
= 0;
1229 net
->sctp
.default_auto_asconf
= 0;
1231 /* Enable PR-SCTP by default. */
1232 net
->sctp
.prsctp_enable
= 1;
1234 /* Disable AUTH by default. */
1235 net
->sctp
.auth_enable
= 0;
1237 /* Set SCOPE policy to enabled */
1238 net
->sctp
.scope_policy
= SCTP_SCOPE_POLICY_ENABLE
;
1240 /* Set the default rwnd update threshold */
1241 net
->sctp
.rwnd_upd_shift
= SCTP_DEFAULT_RWND_SHIFT
;
1243 /* Initialize maximum autoclose timeout. */
1244 net
->sctp
.max_autoclose
= INT_MAX
/ HZ
;
1246 status
= sctp_sysctl_net_register(net
);
1248 goto err_sysctl_register
;
1250 /* Allocate and initialise sctp mibs. */
1251 status
= init_sctp_mibs(net
);
1255 /* Initialize proc fs directory. */
1256 status
= sctp_proc_init(net
);
1260 sctp_dbg_objcnt_init(net
);
1262 /* Initialize the control inode/socket for handling OOTB packets. */
1263 if ((status
= sctp_ctl_sock_init(net
))) {
1264 pr_err("Failed to initialize the SCTP control sock\n");
1265 goto err_ctl_sock_init
;
1268 /* Initialize the local address list. */
1269 INIT_LIST_HEAD(&net
->sctp
.local_addr_list
);
1270 spin_lock_init(&net
->sctp
.local_addr_lock
);
1271 sctp_get_local_addr_list(net
);
1273 /* Initialize the address event list */
1274 INIT_LIST_HEAD(&net
->sctp
.addr_waitq
);
1275 INIT_LIST_HEAD(&net
->sctp
.auto_asconf_splist
);
1276 spin_lock_init(&net
->sctp
.addr_wq_lock
);
1277 net
->sctp
.addr_wq_timer
.expires
= 0;
1278 setup_timer(&net
->sctp
.addr_wq_timer
, sctp_addr_wq_timeout_handler
,
1279 (unsigned long)net
);
1284 sctp_dbg_objcnt_exit(net
);
1285 sctp_proc_exit(net
);
1287 cleanup_sctp_mibs(net
);
1289 sctp_sysctl_net_unregister(net
);
1290 err_sysctl_register
:
1294 static void __net_exit
sctp_net_exit(struct net
*net
)
1296 /* Free the local address list */
1297 sctp_free_addr_wq(net
);
1298 sctp_free_local_addr_list(net
);
1300 /* Free the control endpoint. */
1301 inet_ctl_sock_destroy(net
->sctp
.ctl_sock
);
1303 sctp_dbg_objcnt_exit(net
);
1305 sctp_proc_exit(net
);
1306 cleanup_sctp_mibs(net
);
1307 sctp_sysctl_net_unregister(net
);
1310 static struct pernet_operations sctp_net_ops
= {
1311 .init
= sctp_net_init
,
1312 .exit
= sctp_net_exit
,
1315 /* Initialize the universe into something sensible. */
1316 static __init
int sctp_init(void)
1319 int status
= -EINVAL
;
1321 unsigned long limit
;
1325 BUILD_BUG_ON(sizeof(struct sctp_ulpevent
) >
1326 sizeof(((struct sk_buff
*) 0)->cb
));
1328 /* Allocate bind_bucket and chunk caches. */
1330 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1331 sizeof(struct sctp_bind_bucket
),
1332 0, SLAB_HWCACHE_ALIGN
,
1334 if (!sctp_bucket_cachep
)
1337 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1338 sizeof(struct sctp_chunk
),
1339 0, SLAB_HWCACHE_ALIGN
,
1341 if (!sctp_chunk_cachep
)
1342 goto err_chunk_cachep
;
1344 status
= percpu_counter_init(&sctp_sockets_allocated
, 0, GFP_KERNEL
);
1346 goto err_percpu_counter_init
;
1348 /* Implementation specific variables. */
1350 /* Initialize default stream count setup information. */
1351 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1352 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1354 /* Initialize handle used for association ids. */
1355 idr_init(&sctp_assocs_id
);
1357 limit
= nr_free_buffer_pages() / 8;
1358 limit
= max(limit
, 128UL);
1359 sysctl_sctp_mem
[0] = limit
/ 4 * 3;
1360 sysctl_sctp_mem
[1] = limit
;
1361 sysctl_sctp_mem
[2] = sysctl_sctp_mem
[0] * 2;
1363 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1364 limit
= (sysctl_sctp_mem
[1]) << (PAGE_SHIFT
- 7);
1365 max_share
= min(4UL*1024*1024, limit
);
1367 sysctl_sctp_rmem
[0] = SK_MEM_QUANTUM
; /* give each asoc 1 page min */
1368 sysctl_sctp_rmem
[1] = 1500 * SKB_TRUESIZE(1);
1369 sysctl_sctp_rmem
[2] = max(sysctl_sctp_rmem
[1], max_share
);
1371 sysctl_sctp_wmem
[0] = SK_MEM_QUANTUM
;
1372 sysctl_sctp_wmem
[1] = 16*1024;
1373 sysctl_sctp_wmem
[2] = max(64*1024, max_share
);
1375 /* Size and allocate the association hash table.
1376 * The methodology is similar to that of the tcp hash tables.
1378 if (totalram_pages
>= (128 * 1024))
1379 goal
= totalram_pages
>> (22 - PAGE_SHIFT
);
1381 goal
= totalram_pages
>> (24 - PAGE_SHIFT
);
1383 for (order
= 0; (1UL << order
) < goal
; order
++)
1387 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1388 sizeof(struct sctp_hashbucket
);
1389 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1391 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1392 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1393 } while (!sctp_assoc_hashtable
&& --order
> 0);
1394 if (!sctp_assoc_hashtable
) {
1395 pr_err("Failed association hash alloc\n");
1397 goto err_ahash_alloc
;
1399 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1400 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1401 INIT_HLIST_HEAD(&sctp_assoc_hashtable
[i
].chain
);
1404 /* Allocate and initialize the endpoint hash table. */
1405 sctp_ep_hashsize
= 64;
1407 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1408 if (!sctp_ep_hashtable
) {
1409 pr_err("Failed endpoint_hash alloc\n");
1411 goto err_ehash_alloc
;
1413 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1414 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1415 INIT_HLIST_HEAD(&sctp_ep_hashtable
[i
].chain
);
1418 /* Allocate and initialize the SCTP port hash table. */
1420 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1421 sizeof(struct sctp_bind_hashbucket
);
1422 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1424 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1425 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1426 } while (!sctp_port_hashtable
&& --order
> 0);
1427 if (!sctp_port_hashtable
) {
1428 pr_err("Failed bind hash alloc\n");
1430 goto err_bhash_alloc
;
1432 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1433 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1434 INIT_HLIST_HEAD(&sctp_port_hashtable
[i
].chain
);
1437 pr_info("Hash tables configured (established %d bind %d)\n",
1438 sctp_assoc_hashsize
, sctp_port_hashsize
);
1440 sctp_sysctl_register();
1442 INIT_LIST_HEAD(&sctp_address_families
);
1446 status
= sctp_v4_protosw_init();
1449 goto err_protosw_init
;
1451 status
= sctp_v6_protosw_init();
1453 goto err_v6_protosw_init
;
1455 status
= register_pernet_subsys(&sctp_net_ops
);
1457 goto err_register_pernet_subsys
;
1459 status
= sctp_v4_add_protocol();
1461 goto err_add_protocol
;
1463 /* Register SCTP with inet6 layer. */
1464 status
= sctp_v6_add_protocol();
1466 goto err_v6_add_protocol
;
1470 err_v6_add_protocol
:
1471 sctp_v4_del_protocol();
1473 unregister_pernet_subsys(&sctp_net_ops
);
1474 err_register_pernet_subsys
:
1475 sctp_v6_protosw_exit();
1476 err_v6_protosw_init
:
1477 sctp_v4_protosw_exit();
1481 sctp_sysctl_unregister();
1482 free_pages((unsigned long)sctp_port_hashtable
,
1483 get_order(sctp_port_hashsize
*
1484 sizeof(struct sctp_bind_hashbucket
)));
1486 kfree(sctp_ep_hashtable
);
1488 free_pages((unsigned long)sctp_assoc_hashtable
,
1489 get_order(sctp_assoc_hashsize
*
1490 sizeof(struct sctp_hashbucket
)));
1492 percpu_counter_destroy(&sctp_sockets_allocated
);
1493 err_percpu_counter_init
:
1494 kmem_cache_destroy(sctp_chunk_cachep
);
1496 kmem_cache_destroy(sctp_bucket_cachep
);
1500 /* Exit handler for the SCTP protocol. */
1501 static __exit
void sctp_exit(void)
1503 /* BUG. This should probably do something useful like clean
1504 * up all the remaining associations and all that memory.
1507 /* Unregister with inet6/inet layers. */
1508 sctp_v6_del_protocol();
1509 sctp_v4_del_protocol();
1511 unregister_pernet_subsys(&sctp_net_ops
);
1513 /* Free protosw registrations */
1514 sctp_v6_protosw_exit();
1515 sctp_v4_protosw_exit();
1517 /* Unregister with socket layer. */
1521 sctp_sysctl_unregister();
1523 free_pages((unsigned long)sctp_assoc_hashtable
,
1524 get_order(sctp_assoc_hashsize
*
1525 sizeof(struct sctp_hashbucket
)));
1526 kfree(sctp_ep_hashtable
);
1527 free_pages((unsigned long)sctp_port_hashtable
,
1528 get_order(sctp_port_hashsize
*
1529 sizeof(struct sctp_bind_hashbucket
)));
1531 percpu_counter_destroy(&sctp_sockets_allocated
);
1533 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1535 kmem_cache_destroy(sctp_chunk_cachep
);
1536 kmem_cache_destroy(sctp_bucket_cachep
);
1539 module_init(sctp_init
);
1540 module_exit(sctp_exit
);
1543 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1545 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1546 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-132");
1547 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1548 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1549 module_param_named(no_checksums
, sctp_checksum_disable
, bool, 0644);
1550 MODULE_PARM_DESC(no_checksums
, "Disable checksums computing and verification");
1551 MODULE_LICENSE("GPL");