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
;
72 DEFINE_SNMP_STAT(struct sctp_mib
, sctp_statistics
) __read_mostly
;
74 struct idr sctp_assocs_id
;
75 DEFINE_SPINLOCK(sctp_assocs_id_lock
);
77 static struct sctp_pf
*sctp_pf_inet6_specific
;
78 static struct sctp_pf
*sctp_pf_inet_specific
;
79 static struct sctp_af
*sctp_af_v4_specific
;
80 static struct sctp_af
*sctp_af_v6_specific
;
82 struct kmem_cache
*sctp_chunk_cachep __read_mostly
;
83 struct kmem_cache
*sctp_bucket_cachep __read_mostly
;
85 long sysctl_sctp_mem
[3];
86 int sysctl_sctp_rmem
[3];
87 int sysctl_sctp_wmem
[3];
89 /* Set up the proc fs entry for the SCTP protocol. */
90 static __net_init
int sctp_proc_init(struct net
*net
)
93 net
->sctp
.proc_net_sctp
= proc_net_mkdir(net
, "sctp", net
->proc_net
);
94 if (!net
->sctp
.proc_net_sctp
)
95 goto out_proc_net_sctp
;
96 if (sctp_snmp_proc_init(net
))
97 goto out_snmp_proc_init
;
98 if (sctp_eps_proc_init(net
))
99 goto out_eps_proc_init
;
100 if (sctp_assocs_proc_init(net
))
101 goto out_assocs_proc_init
;
102 if (sctp_remaddr_proc_init(net
))
103 goto out_remaddr_proc_init
;
107 out_remaddr_proc_init
:
108 sctp_assocs_proc_exit(net
);
109 out_assocs_proc_init
:
110 sctp_eps_proc_exit(net
);
112 sctp_snmp_proc_exit(net
);
114 remove_proc_entry("sctp", net
->proc_net
);
115 net
->sctp
.proc_net_sctp
= NULL
;
118 #endif /* CONFIG_PROC_FS */
122 /* Clean up the proc fs entry for the SCTP protocol.
123 * Note: Do not make this __exit as it is used in the init error
126 static void sctp_proc_exit(struct net
*net
)
128 #ifdef CONFIG_PROC_FS
129 sctp_snmp_proc_exit(net
);
130 sctp_eps_proc_exit(net
);
131 sctp_assocs_proc_exit(net
);
132 sctp_remaddr_proc_exit(net
);
134 remove_proc_entry("sctp", net
->proc_net
);
135 net
->sctp
.proc_net_sctp
= NULL
;
139 /* Private helper to extract ipv4 address and stash them in
140 * the protocol structure.
142 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
143 struct net_device
*dev
)
145 struct in_device
*in_dev
;
146 struct in_ifaddr
*ifa
;
147 struct sctp_sockaddr_entry
*addr
;
150 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
155 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
156 /* Add the address to the local list. */
157 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
159 addr
->a
.v4
.sin_family
= AF_INET
;
160 addr
->a
.v4
.sin_port
= 0;
161 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
163 INIT_LIST_HEAD(&addr
->list
);
164 list_add_tail(&addr
->list
, addrlist
);
171 /* Extract our IP addresses from the system and stash them in the
172 * protocol structure.
174 static void sctp_get_local_addr_list(struct net
*net
)
176 struct net_device
*dev
;
177 struct list_head
*pos
;
181 for_each_netdev_rcu(net
, dev
) {
182 __list_for_each(pos
, &sctp_address_families
) {
183 af
= list_entry(pos
, struct sctp_af
, list
);
184 af
->copy_addrlist(&net
->sctp
.local_addr_list
, dev
);
190 /* Free the existing local addresses. */
191 static void sctp_free_local_addr_list(struct net
*net
)
193 struct sctp_sockaddr_entry
*addr
;
194 struct list_head
*pos
, *temp
;
196 list_for_each_safe(pos
, temp
, &net
->sctp
.local_addr_list
) {
197 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
203 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
204 int sctp_copy_local_addr_list(struct net
*net
, struct sctp_bind_addr
*bp
,
205 sctp_scope_t scope
, gfp_t gfp
, int copy_flags
)
207 struct sctp_sockaddr_entry
*addr
;
211 list_for_each_entry_rcu(addr
, &net
->sctp
.local_addr_list
, list
) {
214 if (sctp_in_scope(&addr
->a
, scope
)) {
215 /* Now that the address is in scope, check to see if
216 * the address type is really supported by the local
217 * sock as well as the remote peer.
219 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
220 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
221 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
222 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
223 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
224 error
= sctp_add_bind_addr(bp
, &addr
->a
,
225 SCTP_ADDR_SRC
, GFP_ATOMIC
);
237 /* Initialize a sctp_addr from in incoming skb. */
238 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
245 port
= &addr
->v4
.sin_port
;
246 addr
->v4
.sin_family
= AF_INET
;
251 from
= &ip_hdr(skb
)->saddr
;
254 from
= &ip_hdr(skb
)->daddr
;
256 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
259 /* Initialize an sctp_addr from a socket. */
260 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
262 addr
->v4
.sin_family
= AF_INET
;
263 addr
->v4
.sin_port
= 0;
264 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->inet_rcv_saddr
;
267 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
268 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
270 inet_sk(sk
)->inet_rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
273 /* Initialize sk->sk_daddr from sctp_addr. */
274 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
276 inet_sk(sk
)->inet_daddr
= addr
->v4
.sin_addr
.s_addr
;
279 /* Initialize a sctp_addr from an address parameter. */
280 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
281 union sctp_addr_param
*param
,
282 __be16 port
, int iif
)
284 addr
->v4
.sin_family
= AF_INET
;
285 addr
->v4
.sin_port
= port
;
286 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
289 /* Initialize an address parameter from a sctp_addr and return the length
290 * of the address parameter.
292 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
293 union sctp_addr_param
*param
)
295 int length
= sizeof(sctp_ipv4addr_param_t
);
297 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
298 param
->v4
.param_hdr
.length
= htons(length
);
299 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
304 /* Initialize a sctp_addr from a dst_entry. */
305 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct flowi4
*fl4
,
308 saddr
->v4
.sin_family
= AF_INET
;
309 saddr
->v4
.sin_port
= port
;
310 saddr
->v4
.sin_addr
.s_addr
= fl4
->saddr
;
313 /* Compare two addresses exactly. */
314 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
315 const union sctp_addr
*addr2
)
317 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
319 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
321 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
327 /* Initialize addr struct to INADDR_ANY. */
328 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, __be16 port
)
330 addr
->v4
.sin_family
= AF_INET
;
331 addr
->v4
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
332 addr
->v4
.sin_port
= port
;
335 /* Is this a wildcard address? */
336 static int sctp_v4_is_any(const union sctp_addr
*addr
)
338 return htonl(INADDR_ANY
) == addr
->v4
.sin_addr
.s_addr
;
341 /* This function checks if the address is a valid address to be used for
345 * Return 0 - If the address is a non-unicast or an illegal address.
346 * Return 1 - If the address is a unicast.
348 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
349 struct sctp_sock
*sp
,
350 const struct sk_buff
*skb
)
352 /* IPv4 addresses not allowed */
353 if (sp
&& ipv6_only_sock(sctp_opt2sk(sp
)))
356 /* Is this a non-unicast address or a unusable SCTP address? */
357 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
))
360 /* Is this a broadcast address? */
361 if (skb
&& skb_rtable(skb
)->rt_flags
& RTCF_BROADCAST
)
367 /* Should this be available for binding? */
368 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
370 struct net
*net
= sock_net(&sp
->inet
.sk
);
371 int ret
= inet_addr_type(net
, addr
->v4
.sin_addr
.s_addr
);
374 if (addr
->v4
.sin_addr
.s_addr
!= htonl(INADDR_ANY
) &&
376 !sp
->inet
.freebind
&&
377 !sysctl_ip_nonlocal_bind
)
380 if (ipv6_only_sock(sctp_opt2sk(sp
)))
386 /* Checking the loopback, private and other address scopes as defined in
387 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
388 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
390 * Level 0 - unusable SCTP addresses
391 * Level 1 - loopback address
392 * Level 2 - link-local addresses
393 * Level 3 - private addresses.
394 * Level 4 - global addresses
395 * For INIT and INIT-ACK address list, let L be the level of
396 * of requested destination address, sender and receiver
397 * SHOULD include all of its addresses with level greater
398 * than or equal to L.
400 * IPv4 scoping can be controlled through sysctl option
401 * net.sctp.addr_scope_policy
403 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
407 /* Check for unusable SCTP addresses. */
408 if (IS_IPV4_UNUSABLE_ADDRESS(addr
->v4
.sin_addr
.s_addr
)) {
409 retval
= SCTP_SCOPE_UNUSABLE
;
410 } else if (ipv4_is_loopback(addr
->v4
.sin_addr
.s_addr
)) {
411 retval
= SCTP_SCOPE_LOOPBACK
;
412 } else if (ipv4_is_linklocal_169(addr
->v4
.sin_addr
.s_addr
)) {
413 retval
= SCTP_SCOPE_LINK
;
414 } else if (ipv4_is_private_10(addr
->v4
.sin_addr
.s_addr
) ||
415 ipv4_is_private_172(addr
->v4
.sin_addr
.s_addr
) ||
416 ipv4_is_private_192(addr
->v4
.sin_addr
.s_addr
)) {
417 retval
= SCTP_SCOPE_PRIVATE
;
419 retval
= SCTP_SCOPE_GLOBAL
;
425 /* Returns a valid dst cache entry for the given source and destination ip
426 * addresses. If an association is passed, trys to get a dst entry with a
427 * source address that matches an address in the bind address list.
429 static void sctp_v4_get_dst(struct sctp_transport
*t
, union sctp_addr
*saddr
,
430 struct flowi
*fl
, struct sock
*sk
)
432 struct sctp_association
*asoc
= t
->asoc
;
434 struct flowi4
*fl4
= &fl
->u
.ip4
;
435 struct sctp_bind_addr
*bp
;
436 struct sctp_sockaddr_entry
*laddr
;
437 struct dst_entry
*dst
= NULL
;
438 union sctp_addr
*daddr
= &t
->ipaddr
;
439 union sctp_addr dst_saddr
;
441 memset(fl4
, 0x0, sizeof(struct flowi4
));
442 fl4
->daddr
= daddr
->v4
.sin_addr
.s_addr
;
443 fl4
->fl4_dport
= daddr
->v4
.sin_port
;
444 fl4
->flowi4_proto
= IPPROTO_SCTP
;
446 fl4
->flowi4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
447 fl4
->flowi4_oif
= asoc
->base
.sk
->sk_bound_dev_if
;
448 fl4
->fl4_sport
= htons(asoc
->base
.bind_addr
.port
);
451 fl4
->saddr
= saddr
->v4
.sin_addr
.s_addr
;
452 fl4
->fl4_sport
= saddr
->v4
.sin_port
;
455 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
456 __func__
, &fl4
->daddr
, &fl4
->saddr
);
458 rt
= ip_route_output_key(sock_net(sk
), fl4
);
462 /* If there is no association or if a source address is passed, no
463 * more validation is required.
468 bp
= &asoc
->base
.bind_addr
;
471 /* Walk through the bind address list and look for a bind
472 * address that matches the source address of the returned dst.
474 sctp_v4_dst_saddr(&dst_saddr
, fl4
, htons(bp
->port
));
476 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
477 if (!laddr
->valid
|| (laddr
->state
== SCTP_ADDR_DEL
) ||
478 (laddr
->state
!= SCTP_ADDR_SRC
&&
479 !asoc
->src_out_of_asoc_ok
))
481 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
486 /* None of the bound addresses match the source address of the
487 * dst. So release it.
493 /* Walk through the bind address list and try to get a dst that
494 * matches a bind address as the source address.
497 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
500 if ((laddr
->state
== SCTP_ADDR_SRC
) &&
501 (AF_INET
== laddr
->a
.sa
.sa_family
)) {
502 fl4
->saddr
= laddr
->a
.v4
.sin_addr
.s_addr
;
503 fl4
->fl4_sport
= laddr
->a
.v4
.sin_port
;
504 rt
= ip_route_output_key(sock_net(sk
), fl4
);
517 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
518 &fl4
->daddr
, &fl4
->saddr
);
520 SCTP_DEBUG_PRINTK("NO ROUTE\n");
523 /* For v4, the source address is cached in the route entry(dst). So no need
524 * to cache it separately and hence this is an empty routine.
526 static void sctp_v4_get_saddr(struct sctp_sock
*sk
,
527 struct sctp_transport
*t
,
530 union sctp_addr
*saddr
= &t
->saddr
;
531 struct rtable
*rt
= (struct rtable
*)t
->dst
;
534 saddr
->v4
.sin_family
= AF_INET
;
535 saddr
->v4
.sin_addr
.s_addr
= fl
->u
.ip4
.saddr
;
539 /* What interface did this skb arrive on? */
540 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
542 return inet_iif(skb
);
545 /* Was this packet marked by Explicit Congestion Notification? */
546 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
548 return INET_ECN_is_ce(ip_hdr(skb
)->tos
);
551 /* Create and initialize a new sk for the socket returned by accept(). */
552 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
553 struct sctp_association
*asoc
)
555 struct sock
*newsk
= sk_alloc(sock_net(sk
), PF_INET
, GFP_KERNEL
,
557 struct inet_sock
*newinet
;
562 sock_init_data(NULL
, newsk
);
564 sctp_copy_sock(newsk
, sk
, asoc
);
565 sock_reset_flag(newsk
, SOCK_ZAPPED
);
567 newinet
= inet_sk(newsk
);
569 newinet
->inet_daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
571 sk_refcnt_debug_inc(newsk
);
573 if (newsk
->sk_prot
->init(newsk
)) {
574 sk_common_release(newsk
);
582 /* Map address, empty for v4 family */
583 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
588 /* Dump the v4 addr to the seq file. */
589 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
591 seq_printf(seq
, "%pI4 ", &addr
->v4
.sin_addr
);
594 static void sctp_v4_ecn_capable(struct sock
*sk
)
599 void sctp_addr_wq_timeout_handler(unsigned long arg
)
601 struct net
*net
= (struct net
*)arg
;
602 struct sctp_sockaddr_entry
*addrw
, *temp
;
603 struct sctp_sock
*sp
;
605 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
607 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
608 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
609 " for cmd %d at entry %p\n", &net
->sctp
.addr_waitq
, &addrw
->a
, addrw
->state
,
612 #if IS_ENABLED(CONFIG_IPV6)
613 /* Now we send an ASCONF for each association */
614 /* Note. we currently don't handle link local IPv6 addressees */
615 if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
616 struct in6_addr
*in6
;
618 if (ipv6_addr_type(&addrw
->a
.v6
.sin6_addr
) &
622 in6
= (struct in6_addr
*)&addrw
->a
.v6
.sin6_addr
;
623 if (ipv6_chk_addr(net
, in6
, NULL
, 0) == 0 &&
624 addrw
->state
== SCTP_ADDR_NEW
) {
625 unsigned long timeo_val
;
627 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
628 SCTP_ADDRESS_TICK_DELAY
);
630 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
631 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
636 list_for_each_entry(sp
, &net
->sctp
.auto_asconf_splist
, auto_asconf_list
) {
639 sk
= sctp_opt2sk(sp
);
640 /* ignore bound-specific endpoints */
641 if (!sctp_is_ep_boundall(sk
))
643 sctp_bh_lock_sock(sk
);
644 if (sctp_asconf_mgmt(sp
, addrw
) < 0)
645 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
646 sctp_bh_unlock_sock(sk
);
648 #if IS_ENABLED(CONFIG_IPV6)
651 list_del(&addrw
->list
);
654 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
657 static void sctp_free_addr_wq(struct net
*net
)
659 struct sctp_sockaddr_entry
*addrw
;
660 struct sctp_sockaddr_entry
*temp
;
662 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
663 del_timer(&net
->sctp
.addr_wq_timer
);
664 list_for_each_entry_safe(addrw
, temp
, &net
->sctp
.addr_waitq
, list
) {
665 list_del(&addrw
->list
);
668 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
671 /* lookup the entry for the same address in the addr_waitq
672 * sctp_addr_wq MUST be locked
674 static struct sctp_sockaddr_entry
*sctp_addr_wq_lookup(struct net
*net
,
675 struct sctp_sockaddr_entry
*addr
)
677 struct sctp_sockaddr_entry
*addrw
;
679 list_for_each_entry(addrw
, &net
->sctp
.addr_waitq
, list
) {
680 if (addrw
->a
.sa
.sa_family
!= addr
->a
.sa
.sa_family
)
682 if (addrw
->a
.sa
.sa_family
== AF_INET
) {
683 if (addrw
->a
.v4
.sin_addr
.s_addr
==
684 addr
->a
.v4
.sin_addr
.s_addr
)
686 } else if (addrw
->a
.sa
.sa_family
== AF_INET6
) {
687 if (ipv6_addr_equal(&addrw
->a
.v6
.sin6_addr
,
688 &addr
->a
.v6
.sin6_addr
))
695 void sctp_addr_wq_mgmt(struct net
*net
, struct sctp_sockaddr_entry
*addr
, int cmd
)
697 struct sctp_sockaddr_entry
*addrw
;
698 unsigned long timeo_val
;
700 /* first, we check if an opposite message already exist in the queue.
701 * If we found such message, it is removed.
702 * This operation is a bit stupid, but the DHCP client attaches the
703 * new address after a couple of addition and deletion of that address
706 spin_lock_bh(&net
->sctp
.addr_wq_lock
);
707 /* Offsets existing events in addr_wq */
708 addrw
= sctp_addr_wq_lookup(net
, addr
);
710 if (addrw
->state
!= cmd
) {
711 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
712 " in wq %p\n", addrw
->state
, &addrw
->a
,
713 &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
);
729 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
730 " in wq %p\n", addrw
->state
, &addrw
->a
, &net
->sctp
.addr_waitq
);
732 if (!timer_pending(&net
->sctp
.addr_wq_timer
)) {
734 timeo_val
+= msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY
);
735 mod_timer(&net
->sctp
.addr_wq_timer
, timeo_val
);
737 spin_unlock_bh(&net
->sctp
.addr_wq_lock
);
740 /* Event handler for inet address addition/deletion events.
741 * The sctp_local_addr_list needs to be protocted by a spin lock since
742 * multiple notifiers (say IPv4 and IPv6) may be running at the same
743 * time and thus corrupt the list.
744 * The reader side is protected with RCU.
746 static int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
749 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
750 struct sctp_sockaddr_entry
*addr
= NULL
;
751 struct sctp_sockaddr_entry
*temp
;
752 struct net
*net
= dev_net(ifa
->ifa_dev
->dev
);
757 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
759 addr
->a
.v4
.sin_family
= AF_INET
;
760 addr
->a
.v4
.sin_port
= 0;
761 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
763 spin_lock_bh(&net
->sctp
.local_addr_lock
);
764 list_add_tail_rcu(&addr
->list
, &net
->sctp
.local_addr_list
);
765 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_NEW
);
766 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
770 spin_lock_bh(&net
->sctp
.local_addr_lock
);
771 list_for_each_entry_safe(addr
, temp
,
772 &net
->sctp
.local_addr_list
, list
) {
773 if (addr
->a
.sa
.sa_family
== AF_INET
&&
774 addr
->a
.v4
.sin_addr
.s_addr
==
776 sctp_addr_wq_mgmt(net
, addr
, SCTP_ADDR_DEL
);
779 list_del_rcu(&addr
->list
);
783 spin_unlock_bh(&net
->sctp
.local_addr_lock
);
785 kfree_rcu(addr
, rcu
);
793 * Initialize the control inode/socket with a control endpoint data
794 * structure. This endpoint is reserved exclusively for the OOTB processing.
796 static int sctp_ctl_sock_init(struct net
*net
)
799 sa_family_t family
= PF_INET
;
801 if (sctp_get_pf_specific(PF_INET6
))
804 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, family
,
805 SOCK_SEQPACKET
, IPPROTO_SCTP
, net
);
807 /* If IPv6 socket could not be created, try the IPv4 socket */
808 if (err
< 0 && family
== PF_INET6
)
809 err
= inet_ctl_sock_create(&net
->sctp
.ctl_sock
, AF_INET
,
810 SOCK_SEQPACKET
, IPPROTO_SCTP
,
814 pr_err("Failed to create the SCTP control socket\n");
820 /* Register address family specific functions. */
821 int sctp_register_af(struct sctp_af
*af
)
823 switch (af
->sa_family
) {
825 if (sctp_af_v4_specific
)
827 sctp_af_v4_specific
= af
;
830 if (sctp_af_v6_specific
)
832 sctp_af_v6_specific
= af
;
838 INIT_LIST_HEAD(&af
->list
);
839 list_add_tail(&af
->list
, &sctp_address_families
);
843 /* Get the table of functions for manipulating a particular address
846 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
850 return sctp_af_v4_specific
;
852 return sctp_af_v6_specific
;
858 /* Common code to initialize a AF_INET msg_name. */
859 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
861 struct sockaddr_in
*sin
;
863 sin
= (struct sockaddr_in
*)msgname
;
864 *addr_len
= sizeof(struct sockaddr_in
);
865 sin
->sin_family
= AF_INET
;
866 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
869 /* Copy the primary address of the peer primary address as the msg_name. */
870 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
873 struct sockaddr_in
*sin
, *sinfrom
;
876 struct sctp_association
*asoc
;
879 sctp_inet_msgname(msgname
, addr_len
);
880 sin
= (struct sockaddr_in
*)msgname
;
881 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
882 sin
->sin_port
= htons(asoc
->peer
.port
);
883 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
887 /* Initialize and copy out a msgname from an inbound skb. */
888 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
891 struct sctphdr
*sh
= sctp_hdr(skb
);
892 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msgname
;
894 sctp_inet_msgname(msgname
, len
);
895 sin
->sin_port
= sh
->source
;
896 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
900 /* Do we support this AF? */
901 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
903 /* PF_INET only supports AF_INET addresses. */
904 return AF_INET
== family
;
907 /* Address matching with wildcards allowed. */
908 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
909 const union sctp_addr
*addr2
,
910 struct sctp_sock
*opt
)
912 /* PF_INET only supports AF_INET addresses. */
913 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
915 if (htonl(INADDR_ANY
) == addr1
->v4
.sin_addr
.s_addr
||
916 htonl(INADDR_ANY
) == addr2
->v4
.sin_addr
.s_addr
)
918 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
924 /* Verify that provided sockaddr looks bindable. Common verification has
925 * already been taken care of.
927 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
929 return sctp_v4_available(addr
, opt
);
932 /* Verify that sockaddr looks sendable. Common verification has already
933 * been taken care of.
935 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
940 /* Fill in Supported Address Type information for INIT and INIT-ACK
941 * chunks. Returns number of addresses supported.
943 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
946 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
950 /* Wrapper routine that calls the ip transmit routine. */
951 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
952 struct sctp_transport
*transport
)
954 struct inet_sock
*inet
= inet_sk(skb
->sk
);
956 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
957 __func__
, skb
, skb
->len
,
958 &transport
->fl
.u
.ip4
.saddr
,
959 &transport
->fl
.u
.ip4
.daddr
);
961 inet
->pmtudisc
= transport
->param_flags
& SPP_PMTUD_ENABLE
?
962 IP_PMTUDISC_DO
: IP_PMTUDISC_DONT
;
964 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
965 return ip_queue_xmit(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_v4map
= sctp_v4_addr_v4map
,
983 /* Notifier for inetaddr addition/deletion events. */
984 static struct notifier_block sctp_inetaddr_notifier
= {
985 .notifier_call
= sctp_inetaddr_event
,
988 /* Socket operations. */
989 static const struct proto_ops inet_seqpacket_ops
= {
991 .owner
= THIS_MODULE
,
992 .release
= inet_release
, /* Needs to be wrapped... */
994 .connect
= inet_dgram_connect
,
995 .socketpair
= sock_no_socketpair
,
996 .accept
= inet_accept
,
997 .getname
= inet_getname
, /* Semantics are different. */
1000 .listen
= sctp_inet_listen
,
1001 .shutdown
= inet_shutdown
, /* Looks harmless. */
1002 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem */
1003 .getsockopt
= sock_common_getsockopt
,
1004 .sendmsg
= inet_sendmsg
,
1005 .recvmsg
= sock_common_recvmsg
,
1006 .mmap
= sock_no_mmap
,
1007 .sendpage
= sock_no_sendpage
,
1008 #ifdef CONFIG_COMPAT
1009 .compat_setsockopt
= compat_sock_common_setsockopt
,
1010 .compat_getsockopt
= compat_sock_common_getsockopt
,
1014 /* Registration with AF_INET family. */
1015 static struct inet_protosw sctp_seqpacket_protosw
= {
1016 .type
= SOCK_SEQPACKET
,
1017 .protocol
= IPPROTO_SCTP
,
1019 .ops
= &inet_seqpacket_ops
,
1021 .flags
= SCTP_PROTOSW_FLAG
1023 static struct inet_protosw sctp_stream_protosw
= {
1024 .type
= SOCK_STREAM
,
1025 .protocol
= IPPROTO_SCTP
,
1027 .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
,
1040 /* IPv4 address related functions. */
1041 static struct sctp_af sctp_af_inet
= {
1042 .sa_family
= AF_INET
,
1043 .sctp_xmit
= sctp_v4_xmit
,
1044 .setsockopt
= ip_setsockopt
,
1045 .getsockopt
= ip_getsockopt
,
1046 .get_dst
= sctp_v4_get_dst
,
1047 .get_saddr
= sctp_v4_get_saddr
,
1048 .copy_addrlist
= sctp_v4_copy_addrlist
,
1049 .from_skb
= sctp_v4_from_skb
,
1050 .from_sk
= sctp_v4_from_sk
,
1051 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
1052 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
1053 .from_addr_param
= sctp_v4_from_addr_param
,
1054 .to_addr_param
= sctp_v4_to_addr_param
,
1055 .cmp_addr
= sctp_v4_cmp_addr
,
1056 .addr_valid
= sctp_v4_addr_valid
,
1057 .inaddr_any
= sctp_v4_inaddr_any
,
1058 .is_any
= sctp_v4_is_any
,
1059 .available
= sctp_v4_available
,
1060 .scope
= sctp_v4_scope
,
1061 .skb_iif
= sctp_v4_skb_iif
,
1062 .is_ce
= sctp_v4_is_ce
,
1063 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
1064 .ecn_capable
= sctp_v4_ecn_capable
,
1065 .net_header_len
= sizeof(struct iphdr
),
1066 .sockaddr_len
= sizeof(struct sockaddr_in
),
1067 #ifdef CONFIG_COMPAT
1068 .compat_setsockopt
= compat_ip_setsockopt
,
1069 .compat_getsockopt
= compat_ip_getsockopt
,
1073 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
1077 return sctp_pf_inet_specific
;
1079 return sctp_pf_inet6_specific
;
1085 /* Register the PF specific function table. */
1086 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
1090 if (sctp_pf_inet_specific
)
1092 sctp_pf_inet_specific
= pf
;
1095 if (sctp_pf_inet6_specific
)
1097 sctp_pf_inet6_specific
= pf
;
1105 static inline int init_sctp_mibs(void)
1107 return snmp_mib_init((void __percpu
**)sctp_statistics
,
1108 sizeof(struct sctp_mib
),
1109 __alignof__(struct sctp_mib
));
1112 static inline void cleanup_sctp_mibs(void)
1114 snmp_mib_free((void __percpu
**)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 sctp_net_init(struct net
*net
)
1173 /* Initialize proc fs directory. */
1174 status
= sctp_proc_init(net
);
1178 sctp_dbg_objcnt_init(net
);
1180 /* Initialize the control inode/socket for handling OOTB packets. */
1181 if ((status
= sctp_ctl_sock_init(net
))) {
1182 pr_err("Failed to initialize the SCTP control sock\n");
1183 goto err_ctl_sock_init
;
1186 /* Initialize the local address list. */
1187 INIT_LIST_HEAD(&net
->sctp
.local_addr_list
);
1188 spin_lock_init(&net
->sctp
.local_addr_lock
);
1189 sctp_get_local_addr_list(net
);
1191 /* Initialize the address event list */
1192 INIT_LIST_HEAD(&net
->sctp
.addr_waitq
);
1193 INIT_LIST_HEAD(&net
->sctp
.auto_asconf_splist
);
1194 spin_lock_init(&net
->sctp
.addr_wq_lock
);
1195 net
->sctp
.addr_wq_timer
.expires
= 0;
1196 setup_timer(&net
->sctp
.addr_wq_timer
, sctp_addr_wq_timeout_handler
,
1197 (unsigned long)net
);
1202 sctp_dbg_objcnt_exit(net
);
1203 sctp_proc_exit(net
);
1208 static void sctp_net_exit(struct net
*net
)
1210 /* Free the local address list */
1211 sctp_free_addr_wq(net
);
1212 sctp_free_local_addr_list(net
);
1214 /* Free the control endpoint. */
1215 inet_ctl_sock_destroy(net
->sctp
.ctl_sock
);
1217 sctp_dbg_objcnt_exit(net
);
1219 sctp_proc_exit(net
);
1222 static struct pernet_operations sctp_net_ops
= {
1223 .init
= sctp_net_init
,
1224 .exit
= sctp_net_exit
,
1227 /* Initialize the universe into something sensible. */
1228 SCTP_STATIC __init
int sctp_init(void)
1231 int status
= -EINVAL
;
1233 unsigned long limit
;
1237 /* SCTP_DEBUG sanity check. */
1238 if (!sctp_sanity_check())
1241 /* Allocate bind_bucket and chunk caches. */
1243 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1244 sizeof(struct sctp_bind_bucket
),
1245 0, SLAB_HWCACHE_ALIGN
,
1247 if (!sctp_bucket_cachep
)
1250 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1251 sizeof(struct sctp_chunk
),
1252 0, SLAB_HWCACHE_ALIGN
,
1254 if (!sctp_chunk_cachep
)
1255 goto err_chunk_cachep
;
1257 /* Allocate and initialise sctp mibs. */
1258 status
= init_sctp_mibs();
1262 status
= percpu_counter_init(&sctp_sockets_allocated
, 0);
1264 goto err_percpu_counter_init
;
1267 * 14. Suggested SCTP Protocol Parameter Values
1269 /* The following protocol parameters are RECOMMENDED: */
1270 /* RTO.Initial - 3 seconds */
1271 sctp_rto_initial
= SCTP_RTO_INITIAL
;
1272 /* RTO.Min - 1 second */
1273 sctp_rto_min
= SCTP_RTO_MIN
;
1274 /* RTO.Max - 60 seconds */
1275 sctp_rto_max
= SCTP_RTO_MAX
;
1276 /* RTO.Alpha - 1/8 */
1277 sctp_rto_alpha
= SCTP_RTO_ALPHA
;
1278 /* RTO.Beta - 1/4 */
1279 sctp_rto_beta
= SCTP_RTO_BETA
;
1281 /* Valid.Cookie.Life - 60 seconds */
1282 sctp_valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1284 /* Whether Cookie Preservative is enabled(1) or not(0) */
1285 sctp_cookie_preserve_enable
= 1;
1288 sctp_max_burst
= SCTP_DEFAULT_MAX_BURST
;
1290 /* Association.Max.Retrans - 10 attempts
1291 * Path.Max.Retrans - 5 attempts (per destination address)
1292 * Max.Init.Retransmits - 8 attempts
1294 sctp_max_retrans_association
= 10;
1295 sctp_max_retrans_path
= 5;
1296 sctp_max_retrans_init
= 8;
1298 /* Sendbuffer growth - do per-socket accounting */
1299 sctp_sndbuf_policy
= 0;
1301 /* Rcvbuffer growth - do per-socket accounting */
1302 sctp_rcvbuf_policy
= 0;
1304 /* HB.interval - 30 seconds */
1305 sctp_hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1307 /* delayed SACK timeout */
1308 sctp_sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1310 /* Implementation specific variables. */
1312 /* Initialize default stream count setup information. */
1313 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1314 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1316 /* Initialize maximum autoclose timeout. */
1317 sctp_max_autoclose
= INT_MAX
/ HZ
;
1319 /* Initialize handle used for association ids. */
1320 idr_init(&sctp_assocs_id
);
1322 limit
= nr_free_buffer_pages() / 8;
1323 limit
= max(limit
, 128UL);
1324 sysctl_sctp_mem
[0] = limit
/ 4 * 3;
1325 sysctl_sctp_mem
[1] = limit
;
1326 sysctl_sctp_mem
[2] = sysctl_sctp_mem
[0] * 2;
1328 /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1329 limit
= (sysctl_sctp_mem
[1]) << (PAGE_SHIFT
- 7);
1330 max_share
= min(4UL*1024*1024, limit
);
1332 sysctl_sctp_rmem
[0] = SK_MEM_QUANTUM
; /* give each asoc 1 page min */
1333 sysctl_sctp_rmem
[1] = 1500 * SKB_TRUESIZE(1);
1334 sysctl_sctp_rmem
[2] = max(sysctl_sctp_rmem
[1], max_share
);
1336 sysctl_sctp_wmem
[0] = SK_MEM_QUANTUM
;
1337 sysctl_sctp_wmem
[1] = 16*1024;
1338 sysctl_sctp_wmem
[2] = max(64*1024, max_share
);
1340 /* Size and allocate the association hash table.
1341 * The methodology is similar to that of the tcp hash tables.
1343 if (totalram_pages
>= (128 * 1024))
1344 goal
= totalram_pages
>> (22 - PAGE_SHIFT
);
1346 goal
= totalram_pages
>> (24 - PAGE_SHIFT
);
1348 for (order
= 0; (1UL << order
) < goal
; order
++)
1352 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1353 sizeof(struct sctp_hashbucket
);
1354 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1356 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1357 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1358 } while (!sctp_assoc_hashtable
&& --order
> 0);
1359 if (!sctp_assoc_hashtable
) {
1360 pr_err("Failed association hash alloc\n");
1362 goto err_ahash_alloc
;
1364 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1365 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1366 INIT_HLIST_HEAD(&sctp_assoc_hashtable
[i
].chain
);
1369 /* Allocate and initialize the endpoint hash table. */
1370 sctp_ep_hashsize
= 64;
1371 sctp_ep_hashtable
= (struct sctp_hashbucket
*)
1372 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1373 if (!sctp_ep_hashtable
) {
1374 pr_err("Failed endpoint_hash alloc\n");
1376 goto err_ehash_alloc
;
1378 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1379 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1380 INIT_HLIST_HEAD(&sctp_ep_hashtable
[i
].chain
);
1383 /* Allocate and initialize the SCTP port hash table. */
1385 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1386 sizeof(struct sctp_bind_hashbucket
);
1387 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1389 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1390 __get_free_pages(GFP_ATOMIC
|__GFP_NOWARN
, order
);
1391 } while (!sctp_port_hashtable
&& --order
> 0);
1392 if (!sctp_port_hashtable
) {
1393 pr_err("Failed bind hash alloc\n");
1395 goto err_bhash_alloc
;
1397 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1398 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1399 INIT_HLIST_HEAD(&sctp_port_hashtable
[i
].chain
);
1402 pr_info("Hash tables configured (established %d bind %d)\n",
1403 sctp_assoc_hashsize
, sctp_port_hashsize
);
1405 /* Disable ADDIP by default. */
1406 sctp_addip_enable
= 0;
1407 sctp_addip_noauth
= 0;
1408 sctp_default_auto_asconf
= 0;
1410 /* Enable PR-SCTP by default. */
1411 sctp_prsctp_enable
= 1;
1413 /* Disable AUTH by default. */
1414 sctp_auth_enable
= 0;
1416 /* Set SCOPE policy to enabled */
1417 sctp_scope_policy
= SCTP_SCOPE_POLICY_ENABLE
;
1419 /* Set the default rwnd update threshold */
1420 sctp_rwnd_upd_shift
= SCTP_DEFAULT_RWND_SHIFT
;
1422 sctp_sysctl_register();
1424 INIT_LIST_HEAD(&sctp_address_families
);
1428 status
= sctp_v4_protosw_init();
1431 goto err_protosw_init
;
1433 status
= sctp_v6_protosw_init();
1435 goto err_v6_protosw_init
;
1437 status
= register_pernet_subsys(&sctp_net_ops
);
1439 goto err_register_pernet_subsys
;
1441 status
= sctp_v4_add_protocol();
1443 goto err_add_protocol
;
1445 /* Register SCTP with inet6 layer. */
1446 status
= sctp_v6_add_protocol();
1448 goto err_v6_add_protocol
;
1453 err_v6_add_protocol
:
1454 sctp_v4_del_protocol();
1456 unregister_pernet_subsys(&sctp_net_ops
);
1457 err_register_pernet_subsys
:
1458 sctp_v6_protosw_exit();
1459 err_v6_protosw_init
:
1460 sctp_v4_protosw_exit();
1464 sctp_sysctl_unregister();
1465 free_pages((unsigned long)sctp_port_hashtable
,
1466 get_order(sctp_port_hashsize
*
1467 sizeof(struct sctp_bind_hashbucket
)));
1469 kfree(sctp_ep_hashtable
);
1471 free_pages((unsigned long)sctp_assoc_hashtable
,
1472 get_order(sctp_assoc_hashsize
*
1473 sizeof(struct sctp_hashbucket
)));
1475 percpu_counter_destroy(&sctp_sockets_allocated
);
1476 err_percpu_counter_init
:
1477 cleanup_sctp_mibs();
1479 kmem_cache_destroy(sctp_chunk_cachep
);
1481 kmem_cache_destroy(sctp_bucket_cachep
);
1485 /* Exit handler for the SCTP protocol. */
1486 SCTP_STATIC __exit
void sctp_exit(void)
1488 /* BUG. This should probably do something useful like clean
1489 * up all the remaining associations and all that memory.
1492 /* Unregister with inet6/inet layers. */
1493 sctp_v6_del_protocol();
1494 sctp_v4_del_protocol();
1496 unregister_pernet_subsys(&sctp_net_ops
);
1498 /* Free protosw registrations */
1499 sctp_v6_protosw_exit();
1500 sctp_v4_protosw_exit();
1502 /* Unregister with socket layer. */
1506 sctp_sysctl_unregister();
1508 free_pages((unsigned long)sctp_assoc_hashtable
,
1509 get_order(sctp_assoc_hashsize
*
1510 sizeof(struct sctp_hashbucket
)));
1511 kfree(sctp_ep_hashtable
);
1512 free_pages((unsigned long)sctp_port_hashtable
,
1513 get_order(sctp_port_hashsize
*
1514 sizeof(struct sctp_bind_hashbucket
)));
1516 percpu_counter_destroy(&sctp_sockets_allocated
);
1517 cleanup_sctp_mibs();
1519 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1521 kmem_cache_destroy(sctp_chunk_cachep
);
1522 kmem_cache_destroy(sctp_bucket_cachep
);
1525 module_init(sctp_init
);
1526 module_exit(sctp_exit
);
1529 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1531 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1532 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-132");
1533 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1534 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1535 module_param_named(no_checksums
, sctp_checksum_disable
, bool, 0644);
1536 MODULE_PARM_DESC(no_checksums
, "Disable checksums computing and verification");
1537 MODULE_LICENSE("GPL");