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, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
30 * Please send any bug reports or fixes you make to the
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Sridhar Samudrala <sri@us.ibm.com>
42 * Daisy Chang <daisyc@us.ibm.com>
43 * Ardelle Fan <ardelle.fan@intel.com>
45 * Any bugs reported given to us we will try to fix... any fixes shared will
46 * be incorporated into the next SCTP release.
49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51 #include <linux/module.h>
52 #include <linux/init.h>
53 #include <linux/netdevice.h>
54 #include <linux/inetdevice.h>
55 #include <linux/seq_file.h>
56 #include <linux/bootmem.h>
57 #include <linux/highmem.h>
58 #include <linux/swap.h>
59 #include <linux/slab.h>
60 #include <net/net_namespace.h>
61 #include <net/protocol.h>
64 #include <net/route.h>
65 #include <net/sctp/sctp.h>
66 #include <net/addrconf.h>
67 #include <net/inet_common.h>
68 #include <net/inet_ecn.h>
70 /* Global data structures. */
71 struct sctp_globals sctp_globals __read_mostly
;
73 struct idr sctp_assocs_id
;
74 DEFINE_SPINLOCK(sctp_assocs_id_lock
);
76 static struct sctp_pf
*sctp_pf_inet6_specific
;
77 static struct sctp_pf
*sctp_pf_inet_specific
;
78 static struct sctp_af
*sctp_af_v4_specific
;
79 static struct sctp_af
*sctp_af_v6_specific
;
81 struct kmem_cache
*sctp_chunk_cachep __read_mostly
;
82 struct kmem_cache
*sctp_bucket_cachep __read_mostly
;
84 long sysctl_sctp_mem
[3];
85 int sysctl_sctp_rmem
[3];
86 int sysctl_sctp_wmem
[3];
88 /* Set up the proc fs entry for the SCTP protocol. */
89 static int __net_init
sctp_proc_init(struct net
*net
)
92 net
->sctp
.proc_net_sctp
= proc_net_mkdir(net
, "sctp", net
->proc_net
);
93 if (!net
->sctp
.proc_net_sctp
)
94 goto out_proc_net_sctp
;
95 if (sctp_snmp_proc_init(net
))
96 goto out_snmp_proc_init
;
97 if (sctp_eps_proc_init(net
))
98 goto out_eps_proc_init
;
99 if (sctp_assocs_proc_init(net
))
100 goto out_assocs_proc_init
;
101 if (sctp_remaddr_proc_init(net
))
102 goto out_remaddr_proc_init
;
106 out_remaddr_proc_init
:
107 sctp_assocs_proc_exit(net
);
108 out_assocs_proc_init
:
109 sctp_eps_proc_exit(net
);
111 sctp_snmp_proc_exit(net
);
113 remove_proc_entry("sctp", net
->proc_net
);
114 net
->sctp
.proc_net_sctp
= NULL
;
117 #endif /* CONFIG_PROC_FS */
121 /* Clean up the proc fs entry for the SCTP protocol.
122 * Note: Do not make this __exit as it is used in the init error
125 static void sctp_proc_exit(struct net
*net
)
127 #ifdef CONFIG_PROC_FS
128 sctp_snmp_proc_exit(net
);
129 sctp_eps_proc_exit(net
);
130 sctp_assocs_proc_exit(net
);
131 sctp_remaddr_proc_exit(net
);
133 remove_proc_entry("sctp", net
->proc_net
);
134 net
->sctp
.proc_net_sctp
= NULL
;
138 /* Private helper to extract ipv4 address and stash them in
139 * the protocol structure.
141 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
142 struct net_device
*dev
)
144 struct in_device
*in_dev
;
145 struct in_ifaddr
*ifa
;
146 struct sctp_sockaddr_entry
*addr
;
149 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
154 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
155 /* Add the address to the local list. */
156 addr
= kzalloc(sizeof(*addr
), GFP_ATOMIC
);
158 addr
->a
.v4
.sin_family
= AF_INET
;
159 addr
->a
.v4
.sin_port
= 0;
160 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
162 INIT_LIST_HEAD(&addr
->list
);
163 list_add_tail(&addr
->list
, addrlist
);
170 /* Extract our IP addresses from the system and stash them in the
171 * protocol structure.
173 static void sctp_get_local_addr_list(struct net
*net
)
175 struct net_device
*dev
;
176 struct list_head
*pos
;
180 for_each_netdev_rcu(net
, dev
) {
181 list_for_each(pos
, &sctp_address_families
) {
182 af
= list_entry(pos
, struct sctp_af
, list
);
183 af
->copy_addrlist(&net
->sctp
.local_addr_list
, dev
);
189 /* Free the existing local addresses. */
190 static void sctp_free_local_addr_list(struct net
*net
)
192 struct sctp_sockaddr_entry
*addr
;
193 struct list_head
*pos
, *temp
;
195 list_for_each_safe(pos
, temp
, &net
->sctp
.local_addr_list
) {
196 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
202 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
203 int sctp_copy_local_addr_list(struct net
*net
, struct sctp_bind_addr
*bp
,
204 sctp_scope_t scope
, gfp_t gfp
, int copy_flags
)
206 struct sctp_sockaddr_entry
*addr
;
210 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
213 if (sctp_in_scope(net
, &addr
->a
, scope
)) {
214 /* Now that the address is in scope, check to see if
215 * the address type is really supported by the local
216 * sock as well as the remote peer.
218 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
219 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
220 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
221 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
222 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
223 error
= sctp_add_bind_addr(bp
, &addr
->a
,
224 SCTP_ADDR_SRC
, GFP_ATOMIC
);
236 /* Initialize a sctp_addr from in incoming skb. */
237 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
244 port
= &addr
->v4
.sin_port
;
245 addr
->v4
.sin_family
= AF_INET
;
250 from
= &ip_hdr(skb
)->saddr
;
253 from
= &ip_hdr(skb
)->daddr
;
255 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
258 /* Initialize an sctp_addr from a socket. */
259 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
261 addr
->v4
.sin_family
= AF_INET
;
262 addr
->v4
.sin_port
= 0;
263 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->inet_rcv_saddr
;
266 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
267 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
269 inet_sk(sk
)->inet_rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
272 /* Initialize sk->sk_daddr from sctp_addr. */
273 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
275 inet_sk(sk
)->inet_daddr
= addr
->v4
.sin_addr
.s_addr
;
278 /* Initialize a sctp_addr from an address parameter. */
279 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
280 union sctp_addr_param
*param
,
281 __be16 port
, int iif
)
283 addr
->v4
.sin_family
= AF_INET
;
284 addr
->v4
.sin_port
= port
;
285 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
288 /* Initialize an address parameter from a sctp_addr and return the length
289 * of the address parameter.
291 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
292 union sctp_addr_param
*param
)
294 int length
= sizeof(sctp_ipv4addr_param_t
);
296 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
297 param
->v4
.param_hdr
.length
= htons(length
);
298 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
303 /* Initialize a sctp_addr from a dst_entry. */
304 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct flowi4
*fl4
,
307 saddr
->v4
.sin_family
= AF_INET
;
308 saddr
->v4
.sin_port
= port
;
309 saddr
->v4
.sin_addr
.s_addr
= fl4
->saddr
;
312 /* Compare two addresses exactly. */
313 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
314 const union sctp_addr
*addr2
)
316 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
318 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
320 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
326 /* Initialize addr struct to INADDR_ANY. */
327 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, __be16 port
)
329 addr
->v4
.sin_family
= AF_INET
;
330 addr
->v4
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
331 addr
->v4
.sin_port
= port
;
334 /* Is this a wildcard address? */
335 static int sctp_v4_is_any(const union sctp_addr
*addr
)
337 return htonl(INADDR_ANY
) == addr
->v4
.sin_addr
.s_addr
;
340 /* This function checks if the address is a valid address to be used for
344 * Return 0 - If the address is a non-unicast or an illegal address.
345 * Return 1 - If the address is a unicast.
347 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
348 struct sctp_sock
*sp
,
349 const struct sk_buff
*skb
)
351 /* IPv4 addresses not allowed */
352 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
355 /* Is this a non-unicast address or a unusable SCTP address? */
356 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
))
359 /* Is this a broadcast address? */
360 if (skb
&& skb_rtable(skb
)->rt_flags
& RTCF_BROADCAST
)
366 /* Should this be available for binding? */
367 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
369 struct net
*net
= sock_net(&sp
->inet
.sk
);
370 int ret
= inet_addr_type(net
, addr
->v4
.sin_addr
.s_addr
);
373 if (addr
->v4
.sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
375 !sp
->inet
.freebind
&&
376 !sysctl_ip_nonlocal_bind
)
379 if (ipv6_only_sock(sctp_opt2sk(sp
)))
385 /* Checking the loopback, private and other address scopes as defined in
386 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
387 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
389 * Level 0 - unusable SCTP addresses
390 * Level 1 - loopback address
391 * Level 2 - link-local addresses
392 * Level 3 - private addresses.
393 * Level 4 - global addresses
394 * For INIT and INIT-ACK address list, let L be the level of
395 * of requested destination address, sender and receiver
396 * SHOULD include all of its addresses with level greater
397 * than or equal to L.
399 * IPv4 scoping can be controlled through sysctl option
400 * net.sctp.addr_scope_policy
402 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
406 /* Check for unusable SCTP addresses. */
407 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
)) {
408 retval
= SCTP_SCOPE_UNUSABLE
;
409 } else if (ipv4_is_loopback(addr
->v4
.sin_addr
.s_addr
)) {
410 retval
= SCTP_SCOPE_LOOPBACK
;
411 } else if (ipv4_is_linklocal_169(addr
->v4
.sin_addr
.s_addr
)) {
412 retval
= SCTP_SCOPE_LINK
;
413 } else if (ipv4_is_private_10(addr
->v4
.sin_addr
.s_addr
) ||
414 ipv4_is_private_172(addr
->v4
.sin_addr
.s_addr
) ||
415 ipv4_is_private_192(addr
->v4
.sin_addr
.s_addr
)) {
416 retval
= SCTP_SCOPE_PRIVATE
;
418 retval
= SCTP_SCOPE_GLOBAL
;
424 /* Returns a valid dst cache entry for the given source and destination ip
425 * addresses. If an association is passed, trys to get a dst entry with a
426 * source address that matches an address in the bind address list.
428 static void sctp_v4_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
429 struct flowi
*fl
, struct sock
*sk
)
431 struct sctp_association
*asoc
= t
->asoc
;
433 struct flowi4
*fl4
= &fl
->u
.ip4
;
434 struct sctp_bind_addr
*bp
;
435 struct sctp_sockaddr_entry
*laddr
;
436 struct dst_entry
*dst
= NULL
;
437 union sctp_addr
*daddr
= &t
->ipaddr
;
438 union sctp_addr dst_saddr
;
440 memset(fl4
, 0x0, sizeof(struct flowi4
));
441 fl4
->daddr
= daddr
->v4
.sin_addr
.s_addr
;
442 fl4
->fl4_dport
= daddr
->v4
.sin_port
;
443 fl4
->flowi4_proto
= IPPROTO_SCTP
;
445 fl4
->flowi4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
446 fl4
->flowi4_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
447 fl4
->fl4_sport
= htons(asoc
->base
.bind_addr
.port
);
450 fl4
->saddr
= saddr
->v4
.sin_addr
.s_addr
;
451 fl4
->fl4_sport
= saddr
->v4
.sin_port
;
454 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__
, &fl4
->daddr
,
457 rt
= ip_route_output_key(sock_net(sk
), fl4
);
461 /* If there is no association or if a source address is passed, no
462 * more validation is required.
467 bp
= &asoc
->base
.bind_addr
;
470 /* Walk through the bind address list and look for a bind
471 * address that matches the source address of the returned dst.
473 sctp_v4_dst_saddr(&dst_saddr
, fl4
, htons(bp
->port
));
475 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
476 if (!laddr
->valid
|| (laddr
->state
== SCTP_ADDR_DEL
) ||
477 (laddr
->state
!= SCTP_ADDR_SRC
&&
478 !asoc
->src_out_of_asoc_ok
))
480 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
485 /* None of the bound addresses match the source address of the
486 * dst. So release it.
492 /* Walk through the bind address list and try to get a dst that
493 * matches a bind address as the source address.
496 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
499 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
500 (AF_INET
== laddr
->a
.sa
.sa_family
)) {
501 fl4
->saddr
= laddr
->a
.v4
.sin_addr
.s_addr
;
502 fl4
->fl4_sport
= laddr
->a
.v4
.sin_port
;
503 rt
= ip_route_output_key(sock_net(sk
), fl4
);
516 pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
517 &fl4
->daddr
, &fl4
->saddr
);
519 pr_debug("no route\n");
522 /* For v4, the source address is cached in the route entry(dst). So no need
523 * to cache it separately and hence this is an empty routine.
525 static void sctp_v4_get_saddr(struct sctp_sock
*sk
,
526 struct sctp_transport
*t
,
529 union sctp_addr
*saddr
= &t
->saddr
;
530 struct rtable
*rt
= (struct rtable
*)t
->dst
;
533 saddr
->v4
.sin_family
= AF_INET
;
534 saddr
->v4
.sin_addr
.s_addr
= fl
->u
.ip4
.saddr
;
538 /* What interface did this skb arrive on? */
539 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
541 return inet_iif(skb
);
544 /* Was this packet marked by Explicit Congestion Notification? */
545 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
547 return INET_ECN_is_ce(ip_hdr(skb
)->tos
);
550 /* Create and initialize a new sk for the socket returned by accept(). */
551 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
552 struct sctp_association
*asoc
)
554 struct sock
*newsk
= sk_alloc(sock_net(sk
), PF_INET
, GFP_KERNEL
,
556 struct inet_sock
*newinet
;
561 sock_init_data(NULL
, newsk
);
563 sctp_copy_sock(newsk
, sk
, asoc
);
564 sock_reset_flag(newsk
, SOCK_ZAPPED
);
566 newinet
= inet_sk(newsk
);
568 newinet
->inet_daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
570 sk_refcnt_debug_inc(newsk
);
572 if (newsk
->sk_prot
->init(newsk
)) {
573 sk_common_release(newsk
);
581 /* Map address, empty for v4 family */
582 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
587 /* Dump the v4 addr to the seq file. */
588 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
590 seq_printf(seq
, "%pI4 ", &addr
->v4
.sin_addr
);
593 static void sctp_v4_ecn_capable(struct sock
*sk
)
598 static void sctp_addr_wq_timeout_handler(unsigned long arg
)
600 struct net
*net
= (struct net
*)arg
;
601 struct sctp_sockaddr_entry
*addrw
, *temp
;
602 struct sctp_sock
*sp
;
604 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
606 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
607 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
608 "entry:%p\n", __func__
, &net
->sctp
.addr_waitq
, &addrw
->a
.sa
,
609 addrw
->state
, addrw
);
611 #if IS_ENABLED(CONFIG_IPV6)
612 /* Now we send an ASCONF for each association */
613 /* Note. we currently don't handle link local IPv6 addressees */
614 if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
615 struct in6_addr
*in6
;
617 if (ipv6_addr_type(&addrw
->a
.v6
.sin6_addr
) &
621 in6
= (struct in6_addr
*)&addrw
->a
.v6
.sin6_addr
;
622 if (ipv6_chk_addr(net
, in6
, NULL
, 0) == 0 &&
623 addrw
->state
== SCTP_ADDR_NEW
) {
624 unsigned long timeo_val
;
626 pr_debug("%s: this is on DAD, trying %d sec "
628 SCTP_ADDRESS_TICK_DELAY
);
631 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
632 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
637 list_for_each_entry(sp
, &net
->sctp
.auto_asconf_splist
, auto_asconf_list
) {
640 sk
= sctp_opt2sk(sp
);
641 /* ignore bound-specific endpoints */
642 if (!sctp_is_ep_boundall(sk
))
644 sctp_bh_lock_sock(sk
);
645 if (sctp_asconf_mgmt(sp
, addrw
) < 0)
646 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__
);
647 sctp_bh_unlock_sock(sk
);
649 #if IS_ENABLED(CONFIG_IPV6)
652 list_del(&addrw
->list
);
655 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
658 static void sctp_free_addr_wq(struct net
*net
)
660 struct sctp_sockaddr_entry
*addrw
;
661 struct sctp_sockaddr_entry
*temp
;
663 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
664 del_timer(&net
->sctp
.addr_wq_timer
);
665 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
666 list_del(&addrw
->list
);
669 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
672 /* lookup the entry for the same address in the addr_waitq
673 * sctp_addr_wq MUST be locked
675 static struct sctp_sockaddr_entry
*sctp_addr_wq_lookup(struct net
*net
,
676 struct sctp_sockaddr_entry
*addr
)
678 struct sctp_sockaddr_entry
*addrw
;
680 list_for_each_entry(addrw
, &net
->sctp
.addr_waitq
, list
) {
681 if (addrw
->a
.sa
.sa_family
!= addr
->a
.sa
.sa_family
)
683 if (addrw
->a
.sa
.sa_family
== AF_INET
) {
684 if (addrw
->a
.v4
.sin_addr
.s_addr
==
685 addr
->a
.v4
.sin_addr
.s_addr
)
687 } else if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
688 if (ipv6_addr_equal(&addrw
->a
.v6
.sin6_addr
,
689 &addr
->a
.v6
.sin6_addr
))
696 void sctp_addr_wq_mgmt(struct net
*net
, struct sctp_sockaddr_entry
*addr
, int cmd
)
698 struct sctp_sockaddr_entry
*addrw
;
699 unsigned long timeo_val
;
701 /* first, we check if an opposite message already exist in the queue.
702 * If we found such message, it is removed.
703 * This operation is a bit stupid, but the DHCP client attaches the
704 * new address after a couple of addition and deletion of that address
707 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
708 /* Offsets existing events in addr_wq */
709 addrw
= sctp_addr_wq_lookup(net
, addr
);
711 if (addrw
->state
!= cmd
) {
712 pr_debug("%s: offsets existing entry for %d, addr:%pISc "
713 "in wq:%p\n", __func__
, addrw
->state
, &addrw
->a
.sa
,
714 &net
->sctp
.addr_waitq
);
716 list_del(&addrw
->list
);
719 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
723 /* OK, we have to add the new address to the wait queue */
724 addrw
= kmemdup(addr
, sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
726 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
730 list_add_tail(&addrw
->list
, &net
->sctp
.addr_waitq
);
732 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
733 __func__
, addrw
->state
, &addrw
->a
.sa
, &net
->sctp
.addr_waitq
);
735 if (!timer_pending(&net
->sctp
.addr_wq_timer
)) {
737 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
738 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
740 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
743 /* Event handler for inet address addition/deletion events.
744 * The sctp_local_addr_list needs to be protocted by a spin lock since
745 * multiple notifiers (say IPv4 and IPv6) may be running at the same
746 * time and thus corrupt the list.
747 * The reader side is protected with RCU.
749 static int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
752 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
753 struct sctp_sockaddr_entry
*addr
= NULL
;
754 struct sctp_sockaddr_entry
*temp
;
755 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
760 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
762 addr
->a
.v4
.sin_family
= AF_INET
;
763 addr
->a
.v4
.sin_port
= 0;
764 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
766 spin_lock_bh(&net
->sctp
.local_addr_lock
);
767 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
768 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
769 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
773 spin_lock_bh(&net
->sctp
.local_addr_lock
);
774 list_for_each_entry_safe(addr
, temp
,
775 &net
->sctp
.local_addr_list
, list
) {
776 if (addr
->a
.sa
.sa_family
== AF_INET
&&
777 addr
->a
.v4
.sin_addr
.s_addr
==
779 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
782 list_del_rcu(&addr
->list
);
786 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
788 kfree_rcu(addr
, rcu
);
796 * Initialize the control inode/socket with a control endpoint data
797 * structure. This endpoint is reserved exclusively for the OOTB processing.
799 static int sctp_ctl_sock_init(struct net
*net
)
802 sa_family_t family
= PF_INET
;
804 if (sctp_get_pf_specific(PF_INET6
))
807 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, family
,
808 SOCK_SEQPACKET
, IPPROTO_SCTP
, net
);
810 /* If IPv6 socket could not be created, try the IPv4 socket */
811 if (err
< 0 && family
== PF_INET6
)
812 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, AF_INET
,
813 SOCK_SEQPACKET
, IPPROTO_SCTP
,
817 pr_err("Failed to create the SCTP control socket\n");
823 /* Register address family specific functions. */
824 int sctp_register_af(struct sctp_af
*af
)
826 switch (af
->sa_family
) {
828 if (sctp_af_v4_specific
)
830 sctp_af_v4_specific
= af
;
833 if (sctp_af_v6_specific
)
835 sctp_af_v6_specific
= af
;
841 INIT_LIST_HEAD(&af
->list
);
842 list_add_tail(&af
->list
, &sctp_address_families
);
846 /* Get the table of functions for manipulating a particular address
849 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
853 return sctp_af_v4_specific
;
855 return sctp_af_v6_specific
;
861 /* Common code to initialize a AF_INET msg_name. */
862 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
864 struct sockaddr_in
*sin
;
866 sin
= (struct sockaddr_in
*)msgname
;
867 *addr_len
= sizeof(struct sockaddr_in
);
868 sin
->sin_family
= AF_INET
;
869 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
872 /* Copy the primary address of the peer primary address as the msg_name. */
873 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
876 struct sockaddr_in
*sin
, *sinfrom
;
879 struct sctp_association
*asoc
;
882 sctp_inet_msgname(msgname
, addr_len
);
883 sin
= (struct sockaddr_in
*)msgname
;
884 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
885 sin
->sin_port
= htons(asoc
->peer
.port
);
886 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
890 /* Initialize and copy out a msgname from an inbound skb. */
891 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
894 struct sctphdr
*sh
= sctp_hdr(skb
);
895 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msgname
;
897 sctp_inet_msgname(msgname
, len
);
898 sin
->sin_port
= sh
->source
;
899 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
903 /* Do we support this AF? */
904 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
906 /* PF_INET only supports AF_INET addresses. */
907 return AF_INET
== family
;
910 /* Address matching with wildcards allowed. */
911 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
912 const union sctp_addr
*addr2
,
913 struct sctp_sock
*opt
)
915 /* PF_INET only supports AF_INET addresses. */
916 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
918 if (htonl(INADDR_ANY
) == addr1
->v4
.sin_addr
.s_addr
||
919 htonl(INADDR_ANY
) == addr2
->v4
.sin_addr
.s_addr
)
921 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
927 /* Verify that provided sockaddr looks bindable. Common verification has
928 * already been taken care of.
930 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
932 return sctp_v4_available(addr
, opt
);
935 /* Verify that sockaddr looks sendable. Common verification has already
936 * been taken care of.
938 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
943 /* Fill in Supported Address Type information for INIT and INIT-ACK
944 * chunks. Returns number of addresses supported.
946 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
949 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
953 /* Wrapper routine that calls the ip transmit routine. */
954 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
955 struct sctp_transport
*transport
)
957 struct inet_sock
*inet
= inet_sk(skb
->sk
);
959 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__
, skb
,
960 skb
->len
, &transport
->fl
.u
.ip4
.saddr
, &transport
->fl
.u
.ip4
.daddr
);
962 inet
->pmtudisc
= transport
->param_flags
& SPP_PMTUD_ENABLE
?
963 IP_PMTUDISC_DO
: IP_PMTUDISC_DONT
;
965 SCTP_INC_STATS(sock_net(&inet
->sk
), SCTP_MIB_OUTSCTPPACKS
);
967 return ip_queue_xmit(skb
, &transport
->fl
);
970 static struct sctp_af sctp_af_inet
;
972 static struct sctp_pf sctp_pf_inet
= {
973 .event_msgname
= sctp_inet_event_msgname
,
974 .skb_msgname
= sctp_inet_skb_msgname
,
975 .af_supported
= sctp_inet_af_supported
,
976 .cmp_addr
= sctp_inet_cmp_addr
,
977 .bind_verify
= sctp_inet_bind_verify
,
978 .send_verify
= sctp_inet_send_verify
,
979 .supported_addrs
= sctp_inet_supported_addrs
,
980 .create_accept_sk
= sctp_v4_create_accept_sk
,
981 .addr_v4map
= sctp_v4_addr_v4map
,
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
,
1023 .flags
= SCTP_PROTOSW_FLAG
1025 static struct inet_protosw sctp_stream_protosw
= {
1026 .type
= SOCK_STREAM
,
1027 .protocol
= IPPROTO_SCTP
,
1029 .ops
= &inet_seqpacket_ops
,
1031 .flags
= SCTP_PROTOSW_FLAG
1034 /* Register with IP layer. */
1035 static const struct net_protocol sctp_protocol
= {
1036 .handler
= sctp_rcv
,
1037 .err_handler
= sctp_v4_err
,
1042 /* IPv4 address related functions. */
1043 static struct sctp_af sctp_af_inet
= {
1044 .sa_family
= AF_INET
,
1045 .sctp_xmit
= sctp_v4_xmit
,
1046 .setsockopt
= ip_setsockopt
,
1047 .getsockopt
= ip_getsockopt
,
1048 .get_dst
= sctp_v4_get_dst
,
1049 .get_saddr
= sctp_v4_get_saddr
,
1050 .copy_addrlist
= sctp_v4_copy_addrlist
,
1051 .from_skb
= sctp_v4_from_skb
,
1052 .from_sk
= sctp_v4_from_sk
,
1053 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
1054 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
1055 .from_addr_param
= sctp_v4_from_addr_param
,
1056 .to_addr_param
= sctp_v4_to_addr_param
,
1057 .cmp_addr
= sctp_v4_cmp_addr
,
1058 .addr_valid
= sctp_v4_addr_valid
,
1059 .inaddr_any
= sctp_v4_inaddr_any
,
1060 .is_any
= sctp_v4_is_any
,
1061 .available
= sctp_v4_available
,
1062 .scope
= sctp_v4_scope
,
1063 .skb_iif
= sctp_v4_skb_iif
,
1064 .is_ce
= sctp_v4_is_ce
,
1065 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
1066 .ecn_capable
= sctp_v4_ecn_capable
,
1067 .net_header_len
= sizeof(struct iphdr
),
1068 .sockaddr_len
= sizeof(struct sockaddr_in
),
1069 #ifdef CONFIG_COMPAT
1070 .compat_setsockopt
= compat_ip_setsockopt
,
1071 .compat_getsockopt
= compat_ip_getsockopt
,
1075 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
1079 return sctp_pf_inet_specific
;
1081 return sctp_pf_inet6_specific
;
1087 /* Register the PF specific function table. */
1088 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
1092 if (sctp_pf_inet_specific
)
1094 sctp_pf_inet_specific
= pf
;
1097 if (sctp_pf_inet6_specific
)
1099 sctp_pf_inet6_specific
= pf
;
1107 static inline int init_sctp_mibs(struct net
*net
)
1109 return snmp_mib_init((void __percpu
**)net
->sctp
.sctp_statistics
,
1110 sizeof(struct sctp_mib
),
1111 __alignof__(struct sctp_mib
));
1114 static inline void cleanup_sctp_mibs(struct net
*net
)
1116 snmp_mib_free((void __percpu
**)net
->sctp
.sctp_statistics
);
1119 static void sctp_v4_pf_init(void)
1121 /* Initialize the SCTP specific PF functions. */
1122 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1123 sctp_register_af(&sctp_af_inet
);
1126 static void sctp_v4_pf_exit(void)
1128 list_del(&sctp_af_inet
.list
);
1131 static int sctp_v4_protosw_init(void)
1135 rc
= proto_register(&sctp_prot
, 1);
1139 /* Register SCTP(UDP and TCP style) with socket layer. */
1140 inet_register_protosw(&sctp_seqpacket_protosw
);
1141 inet_register_protosw(&sctp_stream_protosw
);
1146 static void sctp_v4_protosw_exit(void)
1148 inet_unregister_protosw(&sctp_stream_protosw
);
1149 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1150 proto_unregister(&sctp_prot
);
1153 static int sctp_v4_add_protocol(void)
1155 /* Register notifier for inet address additions/deletions. */
1156 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1158 /* Register SCTP with inet layer. */
1159 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0)
1165 static void sctp_v4_del_protocol(void)
1167 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1168 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1171 static int __net_init
sctp_net_init(struct net
*net
)
1176 * 14. Suggested SCTP Protocol Parameter Values
1178 /* The following protocol parameters are RECOMMENDED: */
1179 /* RTO.Initial - 3 seconds */
1180 net
->sctp
.rto_initial
= SCTP_RTO_INITIAL
;
1181 /* RTO.Min - 1 second */
1182 net
->sctp
.rto_min
= SCTP_RTO_MIN
;
1183 /* RTO.Max - 60 seconds */
1184 net
->sctp
.rto_max
= SCTP_RTO_MAX
;
1185 /* RTO.Alpha - 1/8 */
1186 net
->sctp
.rto_alpha
= SCTP_RTO_ALPHA
;
1187 /* RTO.Beta - 1/4 */
1188 net
->sctp
.rto_beta
= SCTP_RTO_BETA
;
1190 /* Valid.Cookie.Life - 60 seconds */
1191 net
->sctp
.valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1193 /* Whether Cookie Preservative is enabled(1) or not(0) */
1194 net
->sctp
.cookie_preserve_enable
= 1;
1196 /* Default sctp sockets to use md5 as their hmac alg */
1197 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1198 net
->sctp
.sctp_hmac_alg
= "md5";
1199 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1200 net
->sctp
.sctp_hmac_alg
= "sha1";
1202 net
->sctp
.sctp_hmac_alg
= NULL
;
1206 net
->sctp
.max_burst
= SCTP_DEFAULT_MAX_BURST
;
1208 /* Association.Max.Retrans - 10 attempts
1209 * Path.Max.Retrans - 5 attempts (per destination address)
1210 * Max.Init.Retransmits - 8 attempts
1212 net
->sctp
.max_retrans_association
= 10;
1213 net
->sctp
.max_retrans_path
= 5;
1214 net
->sctp
.max_retrans_init
= 8;
1216 /* Sendbuffer growth - do per-socket accounting */
1217 net
->sctp
.sndbuf_policy
= 0;
1219 /* Rcvbuffer growth - do per-socket accounting */
1220 net
->sctp
.rcvbuf_policy
= 0;
1222 /* HB.interval - 30 seconds */
1223 net
->sctp
.hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1225 /* delayed SACK timeout */
1226 net
->sctp
.sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1228 /* Disable ADDIP by default. */
1229 net
->sctp
.addip_enable
= 0;
1230 net
->sctp
.addip_noauth
= 0;
1231 net
->sctp
.default_auto_asconf
= 0;
1233 /* Enable PR-SCTP by default. */
1234 net
->sctp
.prsctp_enable
= 1;
1236 /* Disable AUTH by default. */
1237 net
->sctp
.auth_enable
= 0;
1239 /* Set SCOPE policy to enabled */
1240 net
->sctp
.scope_policy
= SCTP_SCOPE_POLICY_ENABLE
;
1242 /* Set the default rwnd update threshold */
1243 net
->sctp
.rwnd_upd_shift
= SCTP_DEFAULT_RWND_SHIFT
;
1245 /* Initialize maximum autoclose timeout. */
1246 net
->sctp
.max_autoclose
= INT_MAX
/ HZ
;
1248 status
= sctp_sysctl_net_register(net
);
1250 goto err_sysctl_register
;
1252 /* Allocate and initialise sctp mibs. */
1253 status
= init_sctp_mibs(net
);
1257 /* Initialize proc fs directory. */
1258 status
= sctp_proc_init(net
);
1262 sctp_dbg_objcnt_init(net
);
1264 /* Initialize the control inode/socket for handling OOTB packets. */
1265 if ((status
= sctp_ctl_sock_init(net
))) {
1266 pr_err("Failed to initialize the SCTP control sock\n");
1267 goto err_ctl_sock_init
;
1270 /* Initialize the local address list. */
1271 INIT_LIST_HEAD(&net
->sctp
.local_addr_list
);
1272 spin_lock_init(&net
->sctp
.local_addr_lock
);
1273 sctp_get_local_addr_list(net
);
1275 /* Initialize the address event list */
1276 INIT_LIST_HEAD(&net
->sctp
.addr_waitq
);
1277 INIT_LIST_HEAD(&net
->sctp
.auto_asconf_splist
);
1278 spin_lock_init(&net
->sctp
.addr_wq_lock
);
1279 net
->sctp
.addr_wq_timer
.expires
= 0;
1280 setup_timer(&net
->sctp
.addr_wq_timer
, sctp_addr_wq_timeout_handler
,
1281 (unsigned long)net
);
1286 sctp_dbg_objcnt_exit(net
);
1287 sctp_proc_exit(net
);
1289 cleanup_sctp_mibs(net
);
1291 sctp_sysctl_net_unregister(net
);
1292 err_sysctl_register
:
1296 static void __net_exit
sctp_net_exit(struct net
*net
)
1298 /* Free the local address list */
1299 sctp_free_addr_wq(net
);
1300 sctp_free_local_addr_list(net
);
1302 /* Free the control endpoint. */
1303 inet_ctl_sock_destroy(net
->sctp
.ctl_sock
);
1305 sctp_dbg_objcnt_exit(net
);
1307 sctp_proc_exit(net
);
1308 cleanup_sctp_mibs(net
);
1309 sctp_sysctl_net_unregister(net
);
1312 static struct pernet_operations sctp_net_ops
= {
1313 .init
= sctp_net_init
,
1314 .exit
= sctp_net_exit
,
1317 /* Initialize the universe into something sensible. */
1318 static __init
int sctp_init(void)
1321 int status
= -EINVAL
;
1323 unsigned long limit
;
1327 BUILD_BUG_ON(sizeof(struct sctp_ulpevent
) >
1328 sizeof(((struct sk_buff
*) 0)->cb
));
1330 /* Allocate bind_bucket and chunk caches. */
1332 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1333 sizeof(struct sctp_bind_bucket
),
1334 0, SLAB_HWCACHE_ALIGN
,
1336 if (!sctp_bucket_cachep
)
1339 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1340 sizeof(struct sctp_chunk
),
1341 0, SLAB_HWCACHE_ALIGN
,
1343 if (!sctp_chunk_cachep
)
1344 goto err_chunk_cachep
;
1346 status
= percpu_counter_init(&sctp_sockets_allocated
, 0);
1348 goto err_percpu_counter_init
;
1350 /* Implementation specific variables. */
1352 /* Initialize default stream count setup information. */
1353 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1354 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1356 /* Initialize handle used for association ids. */
1357 idr_init(&sctp_assocs_id
);
1359 limit
= nr_free_buffer_pages() / 8;
1360 limit
= max(limit
, 128UL);
1361 sysctl_sctp_mem
[0] = limit
/ 4 * 3;
1362 sysctl_sctp_mem
[1] = limit
;
1363 sysctl_sctp_mem
[2] = sysctl_sctp_mem
[0] * 2;
1365 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1366 limit
= (sysctl_sctp_mem
[1]) << (PAGE_SHIFT
- 7);
1367 max_share
= min(4UL*1024*1024, limit
);
1369 sysctl_sctp_rmem
[0] = SK_MEM_QUANTUM
; /* give each asoc 1 page min */
1370 sysctl_sctp_rmem
[1] = 1500 * SKB_TRUESIZE(1);
1371 sysctl_sctp_rmem
[2] = max(sysctl_sctp_rmem
[1], max_share
);
1373 sysctl_sctp_wmem
[0] = SK_MEM_QUANTUM
;
1374 sysctl_sctp_wmem
[1] = 16*1024;
1375 sysctl_sctp_wmem
[2] = max(64*1024, max_share
);
1377 /* Size and allocate the association hash table.
1378 * The methodology is similar to that of the tcp hash tables.
1380 if (totalram_pages
>= (128 * 1024))
1381 goal
= totalram_pages
>> (22 - PAGE_SHIFT
);
1383 goal
= totalram_pages
>> (24 - PAGE_SHIFT
);
1385 for (order
= 0; (1UL << order
) < goal
; order
++)
1389 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1390 sizeof(struct sctp_hashbucket
);
1391 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1393 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1394 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1395 } while (!sctp_assoc_hashtable
&& --order
> 0);
1396 if (!sctp_assoc_hashtable
) {
1397 pr_err("Failed association hash alloc\n");
1399 goto err_ahash_alloc
;
1401 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1402 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1403 INIT_HLIST_HEAD(&sctp_assoc_hashtable
[i
].chain
);
1406 /* Allocate and initialize the endpoint hash table. */
1407 sctp_ep_hashsize
= 64;
1409 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1410 if (!sctp_ep_hashtable
) {
1411 pr_err("Failed endpoint_hash alloc\n");
1413 goto err_ehash_alloc
;
1415 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1416 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1417 INIT_HLIST_HEAD(&sctp_ep_hashtable
[i
].chain
);
1420 /* Allocate and initialize the SCTP port hash table. */
1422 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1423 sizeof(struct sctp_bind_hashbucket
);
1424 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1426 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1427 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1428 } while (!sctp_port_hashtable
&& --order
> 0);
1429 if (!sctp_port_hashtable
) {
1430 pr_err("Failed bind hash alloc\n");
1432 goto err_bhash_alloc
;
1434 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1435 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1436 INIT_HLIST_HEAD(&sctp_port_hashtable
[i
].chain
);
1439 pr_info("Hash tables configured (established %d bind %d)\n",
1440 sctp_assoc_hashsize
, sctp_port_hashsize
);
1442 sctp_sysctl_register();
1444 INIT_LIST_HEAD(&sctp_address_families
);
1448 status
= sctp_v4_protosw_init();
1451 goto err_protosw_init
;
1453 status
= sctp_v6_protosw_init();
1455 goto err_v6_protosw_init
;
1457 status
= register_pernet_subsys(&sctp_net_ops
);
1459 goto err_register_pernet_subsys
;
1461 status
= sctp_v4_add_protocol();
1463 goto err_add_protocol
;
1465 /* Register SCTP with inet6 layer. */
1466 status
= sctp_v6_add_protocol();
1468 goto err_v6_add_protocol
;
1473 err_v6_add_protocol
:
1474 sctp_v4_del_protocol();
1476 unregister_pernet_subsys(&sctp_net_ops
);
1477 err_register_pernet_subsys
:
1478 sctp_v6_protosw_exit();
1479 err_v6_protosw_init
:
1480 sctp_v4_protosw_exit();
1484 sctp_sysctl_unregister();
1485 free_pages((unsigned long)sctp_port_hashtable
,
1486 get_order(sctp_port_hashsize
*
1487 sizeof(struct sctp_bind_hashbucket
)));
1489 kfree(sctp_ep_hashtable
);
1491 free_pages((unsigned long)sctp_assoc_hashtable
,
1492 get_order(sctp_assoc_hashsize
*
1493 sizeof(struct sctp_hashbucket
)));
1495 percpu_counter_destroy(&sctp_sockets_allocated
);
1496 err_percpu_counter_init
:
1497 kmem_cache_destroy(sctp_chunk_cachep
);
1499 kmem_cache_destroy(sctp_bucket_cachep
);
1503 /* Exit handler for the SCTP protocol. */
1504 static __exit
void sctp_exit(void)
1506 /* BUG. This should probably do something useful like clean
1507 * up all the remaining associations and all that memory.
1510 /* Unregister with inet6/inet layers. */
1511 sctp_v6_del_protocol();
1512 sctp_v4_del_protocol();
1514 unregister_pernet_subsys(&sctp_net_ops
);
1516 /* Free protosw registrations */
1517 sctp_v6_protosw_exit();
1518 sctp_v4_protosw_exit();
1520 /* Unregister with socket layer. */
1524 sctp_sysctl_unregister();
1526 free_pages((unsigned long)sctp_assoc_hashtable
,
1527 get_order(sctp_assoc_hashsize
*
1528 sizeof(struct sctp_hashbucket
)));
1529 kfree(sctp_ep_hashtable
);
1530 free_pages((unsigned long)sctp_port_hashtable
,
1531 get_order(sctp_port_hashsize
*
1532 sizeof(struct sctp_bind_hashbucket
)));
1534 percpu_counter_destroy(&sctp_sockets_allocated
);
1536 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1538 kmem_cache_destroy(sctp_chunk_cachep
);
1539 kmem_cache_destroy(sctp_bucket_cachep
);
1542 module_init(sctp_init
);
1543 module_exit(sctp_exit
);
1546 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1548 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1549 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-132");
1550 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1551 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1552 module_param_named(no_checksums
, sctp_checksum_disable
, bool, 0644);
1553 MODULE_PARM_DESC(no_checksums
, "Disable checksums computing and verification");
1554 MODULE_LICENSE("GPL");