1 /* SCTP kernel reference 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 reference Implementation
11 * Initialization/cleanup for SCTP protocol support.
13 * The SCTP reference 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 * The SCTP reference 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 #include <linux/module.h>
50 #include <linux/init.h>
51 #include <linux/netdevice.h>
52 #include <linux/inetdevice.h>
53 #include <linux/seq_file.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
;
65 struct proc_dir_entry
*proc_net_sctp
;
66 DEFINE_SNMP_STAT(struct sctp_mib
, sctp_statistics
) __read_mostly
;
68 struct idr sctp_assocs_id
;
69 DEFINE_SPINLOCK(sctp_assocs_id_lock
);
71 /* This is the global socket data structure used for responding to
72 * the Out-of-the-blue (OOTB) packets. A control sock will be created
73 * for this socket at the initialization time.
75 static struct socket
*sctp_ctl_socket
;
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 kmem_cache_t
*sctp_chunk_cachep __read_mostly
;
83 kmem_cache_t
*sctp_bucket_cachep __read_mostly
;
85 /* Return the address of the control sock. */
86 struct sock
*sctp_get_ctl_sock(void)
88 return sctp_ctl_socket
->sk
;
91 /* Set up the proc fs entry for the SCTP protocol. */
92 static __init
int sctp_proc_init(void)
95 struct proc_dir_entry
*ent
;
96 ent
= proc_mkdir("net/sctp", NULL
);
98 ent
->owner
= THIS_MODULE
;
104 if (sctp_snmp_proc_init())
106 if (sctp_eps_proc_init())
108 if (sctp_assocs_proc_init())
117 /* Clean up the proc fs entry for the SCTP protocol.
118 * Note: Do not make this __exit as it is used in the init error
121 static void sctp_proc_exit(void)
123 sctp_snmp_proc_exit();
124 sctp_eps_proc_exit();
125 sctp_assocs_proc_exit();
128 proc_net_sctp
= NULL
;
129 remove_proc_entry("net/sctp", NULL
);
133 /* Private helper to extract ipv4 address and stash them in
134 * the protocol structure.
136 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
137 struct net_device
*dev
)
139 struct in_device
*in_dev
;
140 struct in_ifaddr
*ifa
;
141 struct sctp_sockaddr_entry
*addr
;
144 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
149 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
150 /* Add the address to the local list. */
151 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
153 addr
->a
.v4
.sin_family
= AF_INET
;
154 addr
->a
.v4
.sin_port
= 0;
155 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
157 list_add_tail(&addr
->list
, addrlist
);
164 /* Extract our IP addresses from the system and stash them in the
165 * protocol structure.
167 static void __sctp_get_local_addr_list(void)
169 struct net_device
*dev
;
170 struct list_head
*pos
;
173 read_lock(&dev_base_lock
);
174 for (dev
= dev_base
; dev
; dev
= dev
->next
) {
175 __list_for_each(pos
, &sctp_address_families
) {
176 af
= list_entry(pos
, struct sctp_af
, list
);
177 af
->copy_addrlist(&sctp_local_addr_list
, dev
);
180 read_unlock(&dev_base_lock
);
183 static void sctp_get_local_addr_list(void)
187 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
188 __sctp_get_local_addr_list();
189 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
192 /* Free the existing local addresses. */
193 static void __sctp_free_local_addr_list(void)
195 struct sctp_sockaddr_entry
*addr
;
196 struct list_head
*pos
, *temp
;
198 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
199 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
205 /* Free the existing local addresses. */
206 static void sctp_free_local_addr_list(void)
210 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
211 __sctp_free_local_addr_list();
212 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
215 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
216 int sctp_copy_local_addr_list(struct sctp_bind_addr
*bp
, sctp_scope_t scope
,
217 gfp_t gfp
, int copy_flags
)
219 struct sctp_sockaddr_entry
*addr
;
221 struct list_head
*pos
;
224 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
225 list_for_each(pos
, &sctp_local_addr_list
) {
226 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
227 if (sctp_in_scope(&addr
->a_h
, scope
)) {
228 /* Now that the address is in scope, check to see if
229 * the address type is really supported by the local
230 * sock as well as the remote peer.
232 if ((((AF_INET
== addr
->a_h
.sa
.sa_family
) &&
233 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
234 (((AF_INET6
== addr
->a_h
.sa
.sa_family
) &&
235 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
236 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
237 error
= sctp_add_bind_addr(bp
, &addr
->a
, 1,
246 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
250 /* Initialize a sctp_addr from in incoming skb. */
251 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
258 port
= &addr
->v4
.sin_port
;
259 addr
->v4
.sin_family
= AF_INET
;
261 sh
= (struct sctphdr
*) skb
->h
.raw
;
264 from
= &skb
->nh
.iph
->saddr
;
267 from
= &skb
->nh
.iph
->daddr
;
269 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
272 /* Initialize an sctp_addr from a socket. */
273 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
275 addr
->v4
.sin_family
= AF_INET
;
276 addr
->v4
.sin_port
= inet_sk(sk
)->num
;
277 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->rcv_saddr
;
280 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
281 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
283 inet_sk(sk
)->rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
286 /* Initialize sk->sk_daddr from sctp_addr. */
287 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
289 inet_sk(sk
)->daddr
= addr
->v4
.sin_addr
.s_addr
;
292 /* Initialize a sctp_addr from an address parameter. */
293 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
294 union sctp_addr_param
*param
,
295 __be16 port
, int iif
)
297 addr
->v4
.sin_family
= AF_INET
;
298 addr
->v4
.sin_port
= port
;
299 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
302 /* Initialize an address parameter from a sctp_addr and return the length
303 * of the address parameter.
305 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
306 union sctp_addr_param
*param
)
308 int length
= sizeof(sctp_ipv4addr_param_t
);
310 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
311 param
->v4
.param_hdr
.length
= htons(length
);
312 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
317 /* Initialize a sctp_addr from a dst_entry. */
318 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct dst_entry
*dst
,
321 struct rtable
*rt
= (struct rtable
*)dst
;
322 saddr
->v4
.sin_family
= AF_INET
;
323 saddr
->v4
.sin_port
= port
;
324 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
327 /* Compare two addresses exactly. */
328 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
329 const union sctp_addr
*addr2
)
331 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
333 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
335 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
341 /* Initialize addr struct to INADDR_ANY. */
342 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, unsigned short port
)
344 addr
->v4
.sin_family
= AF_INET
;
345 addr
->v4
.sin_addr
.s_addr
= INADDR_ANY
;
346 addr
->v4
.sin_port
= port
;
349 /* Is this a wildcard address? */
350 static int sctp_v4_is_any(const union sctp_addr
*addr
)
352 return INADDR_ANY
== addr
->v4
.sin_addr
.s_addr
;
355 /* This function checks if the address is a valid address to be used for
359 * Return 0 - If the address is a non-unicast or an illegal address.
360 * Return 1 - If the address is a unicast.
362 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
363 struct sctp_sock
*sp
,
364 const struct sk_buff
*skb
)
366 /* Is this a non-unicast address or a unusable SCTP address? */
367 if (IS_IPV4_UNUSABLE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
))
370 /* Is this a broadcast address? */
371 if (skb
&& ((struct rtable
*)skb
->dst
)->rt_flags
& RTCF_BROADCAST
)
377 /* Should this be available for binding? */
378 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
380 int ret
= inet_addr_type(addr
->v4
.sin_addr
.s_addr
);
383 if (addr
->v4
.sin_addr
.s_addr
!= INADDR_ANY
&&
385 !sp
->inet
.freebind
&&
386 !sysctl_ip_nonlocal_bind
)
392 /* Checking the loopback, private and other address scopes as defined in
393 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
394 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
396 * Level 0 - unusable SCTP addresses
397 * Level 1 - loopback address
398 * Level 2 - link-local addresses
399 * Level 3 - private addresses.
400 * Level 4 - global addresses
401 * For INIT and INIT-ACK address list, let L be the level of
402 * of requested destination address, sender and receiver
403 * SHOULD include all of its addresses with level greater
404 * than or equal to L.
406 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
410 /* Should IPv4 scoping be a sysctl configurable option
411 * so users can turn it off (default on) for certain
412 * unconventional networking environments?
415 /* Check for unusable SCTP addresses. */
416 if (IS_IPV4_UNUSABLE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
417 retval
= SCTP_SCOPE_UNUSABLE
;
418 } else if (LOOPBACK(addr
->v4
.sin_addr
.s_addr
)) {
419 retval
= SCTP_SCOPE_LOOPBACK
;
420 } else if (IS_IPV4_LINK_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
421 retval
= SCTP_SCOPE_LINK
;
422 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
423 retval
= SCTP_SCOPE_PRIVATE
;
425 retval
= SCTP_SCOPE_GLOBAL
;
431 /* Returns a valid dst cache entry for the given source and destination ip
432 * addresses. If an association is passed, trys to get a dst entry with a
433 * source address that matches an address in the bind address list.
435 static struct dst_entry
*sctp_v4_get_dst(struct sctp_association
*asoc
,
436 union sctp_addr
*daddr
,
437 union sctp_addr
*saddr
)
441 struct sctp_bind_addr
*bp
;
443 struct sctp_sockaddr_entry
*laddr
;
444 struct list_head
*pos
;
445 struct dst_entry
*dst
= NULL
;
446 union sctp_addr dst_saddr
;
448 memset(&fl
, 0x0, sizeof(struct flowi
));
449 fl
.fl4_dst
= daddr
->v4
.sin_addr
.s_addr
;
450 fl
.proto
= IPPROTO_SCTP
;
452 fl
.fl4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
453 fl
.oif
= asoc
->base
.sk
->sk_bound_dev_if
;
456 fl
.fl4_src
= saddr
->v4
.sin_addr
.s_addr
;
458 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
459 __FUNCTION__
, NIPQUAD(fl
.fl4_dst
),
460 NIPQUAD(fl
.fl4_src
));
462 if (!ip_route_output_key(&rt
, &fl
)) {
466 /* If there is no association or if a source address is passed, no
467 * more validation is required.
472 bp
= &asoc
->base
.bind_addr
;
473 addr_lock
= &asoc
->base
.addr_lock
;
476 /* Walk through the bind address list and look for a bind
477 * address that matches the source address of the returned dst.
479 sctp_read_lock(addr_lock
);
480 list_for_each(pos
, &bp
->address_list
) {
481 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
,
483 if (!laddr
->use_as_src
)
485 sctp_v4_dst_saddr(&dst_saddr
, dst
, htons(bp
->port
));
486 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
489 sctp_read_unlock(addr_lock
);
491 /* None of the bound addresses match the source address of the
492 * dst. So release it.
498 /* Walk through the bind address list and try to get a dst that
499 * matches a bind address as the source address.
501 sctp_read_lock(addr_lock
);
502 list_for_each(pos
, &bp
->address_list
) {
503 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
505 if ((laddr
->use_as_src
) &&
506 (AF_INET
== laddr
->a_h
.sa
.sa_family
)) {
507 fl
.fl4_src
= laddr
->a_h
.v4
.sin_addr
.s_addr
;
508 if (!ip_route_output_key(&rt
, &fl
)) {
516 sctp_read_unlock(addr_lock
);
519 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
520 NIPQUAD(rt
->rt_dst
), NIPQUAD(rt
->rt_src
));
522 SCTP_DEBUG_PRINTK("NO ROUTE\n");
527 /* For v4, the source address is cached in the route entry(dst). So no need
528 * to cache it separately and hence this is an empty routine.
530 static void sctp_v4_get_saddr(struct sctp_association
*asoc
,
531 struct dst_entry
*dst
,
532 union sctp_addr
*daddr
,
533 union sctp_addr
*saddr
)
535 struct rtable
*rt
= (struct rtable
*)dst
;
541 saddr
->v4
.sin_family
= AF_INET
;
542 saddr
->v4
.sin_port
= htons(asoc
->base
.bind_addr
.port
);
543 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
547 /* What interface did this skb arrive on? */
548 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
550 return ((struct rtable
*)skb
->dst
)->rt_iif
;
553 /* Was this packet marked by Explicit Congestion Notification? */
554 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
556 return INET_ECN_is_ce(skb
->nh
.iph
->tos
);
559 /* Create and initialize a new sk for the socket returned by accept(). */
560 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
561 struct sctp_association
*asoc
)
563 struct inet_sock
*inet
= inet_sk(sk
);
564 struct inet_sock
*newinet
;
565 struct sock
*newsk
= sk_alloc(PF_INET
, GFP_KERNEL
, sk
->sk_prot
, 1);
570 sock_init_data(NULL
, newsk
);
572 newsk
->sk_type
= SOCK_STREAM
;
574 newsk
->sk_no_check
= sk
->sk_no_check
;
575 newsk
->sk_reuse
= sk
->sk_reuse
;
576 newsk
->sk_shutdown
= sk
->sk_shutdown
;
578 newsk
->sk_destruct
= inet_sock_destruct
;
579 newsk
->sk_family
= PF_INET
;
580 newsk
->sk_protocol
= IPPROTO_SCTP
;
581 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
582 sock_reset_flag(newsk
, SOCK_ZAPPED
);
584 newinet
= inet_sk(newsk
);
586 /* Initialize sk's sport, dport, rcv_saddr and daddr for
587 * getsockname() and getpeername()
589 newinet
->sport
= inet
->sport
;
590 newinet
->saddr
= inet
->saddr
;
591 newinet
->rcv_saddr
= inet
->rcv_saddr
;
592 newinet
->dport
= htons(asoc
->peer
.port
);
593 newinet
->daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
594 newinet
->pmtudisc
= inet
->pmtudisc
;
595 newinet
->id
= asoc
->next_tsn
^ jiffies
;
597 newinet
->uc_ttl
= -1;
598 newinet
->mc_loop
= 1;
600 newinet
->mc_index
= 0;
601 newinet
->mc_list
= NULL
;
603 sk_refcnt_debug_inc(newsk
);
605 if (newsk
->sk_prot
->init(newsk
)) {
606 sk_common_release(newsk
);
614 /* Map address, empty for v4 family */
615 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
620 /* Dump the v4 addr to the seq file. */
621 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
623 seq_printf(seq
, "%d.%d.%d.%d ", NIPQUAD(addr
->v4
.sin_addr
));
626 /* Event handler for inet address addition/deletion events.
627 * Basically, whenever there is an event, we re-build our local address list.
629 int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
634 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
635 __sctp_free_local_addr_list();
636 __sctp_get_local_addr_list();
637 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
643 * Initialize the control inode/socket with a control endpoint data
644 * structure. This endpoint is reserved exclusively for the OOTB processing.
646 static int sctp_ctl_sock_init(void)
651 if (sctp_get_pf_specific(PF_INET6
))
656 err
= sock_create_kern(family
, SOCK_SEQPACKET
, IPPROTO_SCTP
,
660 "SCTP: Failed to create the SCTP control socket.\n");
663 sctp_ctl_socket
->sk
->sk_allocation
= GFP_ATOMIC
;
664 inet_sk(sctp_ctl_socket
->sk
)->uc_ttl
= -1;
669 /* Register address family specific functions. */
670 int sctp_register_af(struct sctp_af
*af
)
672 switch (af
->sa_family
) {
674 if (sctp_af_v4_specific
)
676 sctp_af_v4_specific
= af
;
679 if (sctp_af_v6_specific
)
681 sctp_af_v6_specific
= af
;
687 INIT_LIST_HEAD(&af
->list
);
688 list_add_tail(&af
->list
, &sctp_address_families
);
692 /* Get the table of functions for manipulating a particular address
695 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
699 return sctp_af_v4_specific
;
701 return sctp_af_v6_specific
;
707 /* Common code to initialize a AF_INET msg_name. */
708 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
710 struct sockaddr_in
*sin
;
712 sin
= (struct sockaddr_in
*)msgname
;
713 *addr_len
= sizeof(struct sockaddr_in
);
714 sin
->sin_family
= AF_INET
;
715 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
718 /* Copy the primary address of the peer primary address as the msg_name. */
719 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
722 struct sockaddr_in
*sin
, *sinfrom
;
725 struct sctp_association
*asoc
;
728 sctp_inet_msgname(msgname
, addr_len
);
729 sin
= (struct sockaddr_in
*)msgname
;
730 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
731 sin
->sin_port
= htons(asoc
->peer
.port
);
732 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
736 /* Initialize and copy out a msgname from an inbound skb. */
737 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
740 struct sockaddr_in
*sin
;
743 sctp_inet_msgname(msgname
, len
);
744 sin
= (struct sockaddr_in
*)msgname
;
745 sh
= (struct sctphdr
*)skb
->h
.raw
;
746 sin
->sin_port
= sh
->source
;
747 sin
->sin_addr
.s_addr
= skb
->nh
.iph
->saddr
;
751 /* Do we support this AF? */
752 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
754 /* PF_INET only supports AF_INET addresses. */
755 return (AF_INET
== family
);
758 /* Address matching with wildcards allowed. */
759 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
760 const union sctp_addr
*addr2
,
761 struct sctp_sock
*opt
)
763 /* PF_INET only supports AF_INET addresses. */
764 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
766 if (INADDR_ANY
== addr1
->v4
.sin_addr
.s_addr
||
767 INADDR_ANY
== addr2
->v4
.sin_addr
.s_addr
)
769 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
775 /* Verify that provided sockaddr looks bindable. Common verification has
776 * already been taken care of.
778 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
780 return sctp_v4_available(addr
, opt
);
783 /* Verify that sockaddr looks sendable. Common verification has already
784 * been taken care of.
786 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
791 /* Fill in Supported Address Type information for INIT and INIT-ACK
792 * chunks. Returns number of addresses supported.
794 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
797 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
801 /* Wrapper routine that calls the ip transmit routine. */
802 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
803 struct sctp_transport
*transport
, int ipfragok
)
805 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
806 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
807 __FUNCTION__
, skb
, skb
->len
,
808 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_src
),
809 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_dst
));
811 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
812 return ip_queue_xmit(skb
, skb
->sk
, ipfragok
);
815 static struct sctp_af sctp_ipv4_specific
;
817 static struct sctp_pf sctp_pf_inet
= {
818 .event_msgname
= sctp_inet_event_msgname
,
819 .skb_msgname
= sctp_inet_skb_msgname
,
820 .af_supported
= sctp_inet_af_supported
,
821 .cmp_addr
= sctp_inet_cmp_addr
,
822 .bind_verify
= sctp_inet_bind_verify
,
823 .send_verify
= sctp_inet_send_verify
,
824 .supported_addrs
= sctp_inet_supported_addrs
,
825 .create_accept_sk
= sctp_v4_create_accept_sk
,
826 .addr_v4map
= sctp_v4_addr_v4map
,
827 .af
= &sctp_ipv4_specific
,
830 /* Notifier for inetaddr addition/deletion events. */
831 static struct notifier_block sctp_inetaddr_notifier
= {
832 .notifier_call
= sctp_inetaddr_event
,
835 /* Socket operations. */
836 static const struct proto_ops inet_seqpacket_ops
= {
838 .owner
= THIS_MODULE
,
839 .release
= inet_release
, /* Needs to be wrapped... */
841 .connect
= inet_dgram_connect
,
842 .socketpair
= sock_no_socketpair
,
843 .accept
= inet_accept
,
844 .getname
= inet_getname
, /* Semantics are different. */
847 .listen
= sctp_inet_listen
,
848 .shutdown
= inet_shutdown
, /* Looks harmless. */
849 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem */
850 .getsockopt
= sock_common_getsockopt
,
851 .sendmsg
= inet_sendmsg
,
852 .recvmsg
= sock_common_recvmsg
,
853 .mmap
= sock_no_mmap
,
854 .sendpage
= sock_no_sendpage
,
856 .compat_setsockopt
= compat_sock_common_setsockopt
,
857 .compat_getsockopt
= compat_sock_common_getsockopt
,
861 /* Registration with AF_INET family. */
862 static struct inet_protosw sctp_seqpacket_protosw
= {
863 .type
= SOCK_SEQPACKET
,
864 .protocol
= IPPROTO_SCTP
,
866 .ops
= &inet_seqpacket_ops
,
869 .flags
= SCTP_PROTOSW_FLAG
871 static struct inet_protosw sctp_stream_protosw
= {
873 .protocol
= IPPROTO_SCTP
,
875 .ops
= &inet_seqpacket_ops
,
878 .flags
= SCTP_PROTOSW_FLAG
881 /* Register with IP layer. */
882 static struct net_protocol sctp_protocol
= {
884 .err_handler
= sctp_v4_err
,
888 /* IPv4 address related functions. */
889 static struct sctp_af sctp_ipv4_specific
= {
890 .sa_family
= AF_INET
,
891 .sctp_xmit
= sctp_v4_xmit
,
892 .setsockopt
= ip_setsockopt
,
893 .getsockopt
= ip_getsockopt
,
894 .get_dst
= sctp_v4_get_dst
,
895 .get_saddr
= sctp_v4_get_saddr
,
896 .copy_addrlist
= sctp_v4_copy_addrlist
,
897 .from_skb
= sctp_v4_from_skb
,
898 .from_sk
= sctp_v4_from_sk
,
899 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
900 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
901 .from_addr_param
= sctp_v4_from_addr_param
,
902 .to_addr_param
= sctp_v4_to_addr_param
,
903 .dst_saddr
= sctp_v4_dst_saddr
,
904 .cmp_addr
= sctp_v4_cmp_addr
,
905 .addr_valid
= sctp_v4_addr_valid
,
906 .inaddr_any
= sctp_v4_inaddr_any
,
907 .is_any
= sctp_v4_is_any
,
908 .available
= sctp_v4_available
,
909 .scope
= sctp_v4_scope
,
910 .skb_iif
= sctp_v4_skb_iif
,
911 .is_ce
= sctp_v4_is_ce
,
912 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
913 .net_header_len
= sizeof(struct iphdr
),
914 .sockaddr_len
= sizeof(struct sockaddr_in
),
916 .compat_setsockopt
= compat_ip_setsockopt
,
917 .compat_getsockopt
= compat_ip_getsockopt
,
921 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
925 return sctp_pf_inet_specific
;
927 return sctp_pf_inet6_specific
;
933 /* Register the PF specific function table. */
934 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
938 if (sctp_pf_inet_specific
)
940 sctp_pf_inet_specific
= pf
;
943 if (sctp_pf_inet6_specific
)
945 sctp_pf_inet6_specific
= pf
;
953 static int __init
init_sctp_mibs(void)
955 sctp_statistics
[0] = alloc_percpu(struct sctp_mib
);
956 if (!sctp_statistics
[0])
958 sctp_statistics
[1] = alloc_percpu(struct sctp_mib
);
959 if (!sctp_statistics
[1]) {
960 free_percpu(sctp_statistics
[0]);
967 static void cleanup_sctp_mibs(void)
969 free_percpu(sctp_statistics
[0]);
970 free_percpu(sctp_statistics
[1]);
973 /* Initialize the universe into something sensible. */
974 SCTP_STATIC __init
int sctp_init(void)
977 int status
= -EINVAL
;
981 /* SCTP_DEBUG sanity check. */
982 if (!sctp_sanity_check())
985 status
= proto_register(&sctp_prot
, 1);
989 /* Add SCTP to inet_protos hash table. */
991 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0)
992 goto err_add_protocol
;
994 /* Add SCTP(TCP and UDP style) to inetsw linked list. */
995 inet_register_protosw(&sctp_seqpacket_protosw
);
996 inet_register_protosw(&sctp_stream_protosw
);
998 /* Allocate a cache pools. */
1000 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1001 sizeof(struct sctp_bind_bucket
),
1002 0, SLAB_HWCACHE_ALIGN
,
1005 if (!sctp_bucket_cachep
)
1006 goto err_bucket_cachep
;
1008 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1009 sizeof(struct sctp_chunk
),
1010 0, SLAB_HWCACHE_ALIGN
,
1012 if (!sctp_chunk_cachep
)
1013 goto err_chunk_cachep
;
1015 /* Allocate and initialise sctp mibs. */
1016 status
= init_sctp_mibs();
1020 /* Initialize proc fs directory. */
1021 status
= sctp_proc_init();
1025 /* Initialize object count debugging. */
1026 sctp_dbg_objcnt_init();
1028 /* Initialize the SCTP specific PF functions. */
1029 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1031 * 14. Suggested SCTP Protocol Parameter Values
1033 /* The following protocol parameters are RECOMMENDED: */
1034 /* RTO.Initial - 3 seconds */
1035 sctp_rto_initial
= SCTP_RTO_INITIAL
;
1036 /* RTO.Min - 1 second */
1037 sctp_rto_min
= SCTP_RTO_MIN
;
1038 /* RTO.Max - 60 seconds */
1039 sctp_rto_max
= SCTP_RTO_MAX
;
1040 /* RTO.Alpha - 1/8 */
1041 sctp_rto_alpha
= SCTP_RTO_ALPHA
;
1042 /* RTO.Beta - 1/4 */
1043 sctp_rto_beta
= SCTP_RTO_BETA
;
1045 /* Valid.Cookie.Life - 60 seconds */
1046 sctp_valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1048 /* Whether Cookie Preservative is enabled(1) or not(0) */
1049 sctp_cookie_preserve_enable
= 1;
1052 sctp_max_burst
= SCTP_MAX_BURST
;
1054 /* Association.Max.Retrans - 10 attempts
1055 * Path.Max.Retrans - 5 attempts (per destination address)
1056 * Max.Init.Retransmits - 8 attempts
1058 sctp_max_retrans_association
= 10;
1059 sctp_max_retrans_path
= 5;
1060 sctp_max_retrans_init
= 8;
1062 /* Sendbuffer growth - do per-socket accounting */
1063 sctp_sndbuf_policy
= 0;
1065 /* Rcvbuffer growth - do per-socket accounting */
1066 sctp_rcvbuf_policy
= 0;
1068 /* HB.interval - 30 seconds */
1069 sctp_hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1071 /* delayed SACK timeout */
1072 sctp_sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1074 /* Implementation specific variables. */
1076 /* Initialize default stream count setup information. */
1077 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1078 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1080 /* Initialize handle used for association ids. */
1081 idr_init(&sctp_assocs_id
);
1083 /* Size and allocate the association hash table.
1084 * The methodology is similar to that of the tcp hash tables.
1086 if (num_physpages
>= (128 * 1024))
1087 goal
= num_physpages
>> (22 - PAGE_SHIFT
);
1089 goal
= num_physpages
>> (24 - PAGE_SHIFT
);
1091 for (order
= 0; (1UL << order
) < goal
; order
++)
1095 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1096 sizeof(struct sctp_hashbucket
);
1097 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1099 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1100 __get_free_pages(GFP_ATOMIC
, order
);
1101 } while (!sctp_assoc_hashtable
&& --order
> 0);
1102 if (!sctp_assoc_hashtable
) {
1103 printk(KERN_ERR
"SCTP: Failed association hash alloc.\n");
1105 goto err_ahash_alloc
;
1107 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1108 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1109 sctp_assoc_hashtable
[i
].chain
= NULL
;
1112 /* Allocate and initialize the endpoint hash table. */
1113 sctp_ep_hashsize
= 64;
1114 sctp_ep_hashtable
= (struct sctp_hashbucket
*)
1115 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1116 if (!sctp_ep_hashtable
) {
1117 printk(KERN_ERR
"SCTP: Failed endpoint_hash alloc.\n");
1119 goto err_ehash_alloc
;
1121 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1122 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1123 sctp_ep_hashtable
[i
].chain
= NULL
;
1126 /* Allocate and initialize the SCTP port hash table. */
1128 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1129 sizeof(struct sctp_bind_hashbucket
);
1130 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1132 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1133 __get_free_pages(GFP_ATOMIC
, order
);
1134 } while (!sctp_port_hashtable
&& --order
> 0);
1135 if (!sctp_port_hashtable
) {
1136 printk(KERN_ERR
"SCTP: Failed bind hash alloc.");
1138 goto err_bhash_alloc
;
1140 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1141 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1142 sctp_port_hashtable
[i
].chain
= NULL
;
1145 spin_lock_init(&sctp_port_alloc_lock
);
1146 sctp_port_rover
= sysctl_local_port_range
[0] - 1;
1148 printk(KERN_INFO
"SCTP: Hash tables configured "
1149 "(established %d bind %d)\n",
1150 sctp_assoc_hashsize
, sctp_port_hashsize
);
1152 /* Disable ADDIP by default. */
1153 sctp_addip_enable
= 0;
1155 /* Enable PR-SCTP by default. */
1156 sctp_prsctp_enable
= 1;
1158 sctp_sysctl_register();
1160 INIT_LIST_HEAD(&sctp_address_families
);
1161 sctp_register_af(&sctp_ipv4_specific
);
1163 status
= sctp_v6_init();
1167 /* Initialize the control inode/socket for handling OOTB packets. */
1168 if ((status
= sctp_ctl_sock_init())) {
1170 "SCTP: Failed to initialize the SCTP control sock.\n");
1171 goto err_ctl_sock_init
;
1174 /* Initialize the local address list. */
1175 INIT_LIST_HEAD(&sctp_local_addr_list
);
1176 spin_lock_init(&sctp_local_addr_lock
);
1178 /* Register notifier for inet address additions/deletions. */
1179 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1181 sctp_get_local_addr_list();
1183 __unsafe(THIS_MODULE
);
1190 sctp_sysctl_unregister();
1191 list_del(&sctp_ipv4_specific
.list
);
1192 free_pages((unsigned long)sctp_port_hashtable
,
1193 get_order(sctp_port_hashsize
*
1194 sizeof(struct sctp_bind_hashbucket
)));
1196 kfree(sctp_ep_hashtable
);
1198 free_pages((unsigned long)sctp_assoc_hashtable
,
1199 get_order(sctp_assoc_hashsize
*
1200 sizeof(struct sctp_hashbucket
)));
1202 sctp_dbg_objcnt_exit();
1205 cleanup_sctp_mibs();
1207 kmem_cache_destroy(sctp_chunk_cachep
);
1209 kmem_cache_destroy(sctp_bucket_cachep
);
1211 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1212 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1213 inet_unregister_protosw(&sctp_stream_protosw
);
1215 proto_unregister(&sctp_prot
);
1219 /* Exit handler for the SCTP protocol. */
1220 SCTP_STATIC __exit
void sctp_exit(void)
1222 /* BUG. This should probably do something useful like clean
1223 * up all the remaining associations and all that memory.
1226 /* Unregister notifier for inet address additions/deletions. */
1227 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1229 /* Free the local address list. */
1230 sctp_free_local_addr_list();
1232 /* Free the control endpoint. */
1233 sock_release(sctp_ctl_socket
);
1236 sctp_sysctl_unregister();
1237 list_del(&sctp_ipv4_specific
.list
);
1239 free_pages((unsigned long)sctp_assoc_hashtable
,
1240 get_order(sctp_assoc_hashsize
*
1241 sizeof(struct sctp_hashbucket
)));
1242 kfree(sctp_ep_hashtable
);
1243 free_pages((unsigned long)sctp_port_hashtable
,
1244 get_order(sctp_port_hashsize
*
1245 sizeof(struct sctp_bind_hashbucket
)));
1247 kmem_cache_destroy(sctp_chunk_cachep
);
1248 kmem_cache_destroy(sctp_bucket_cachep
);
1250 sctp_dbg_objcnt_exit();
1252 cleanup_sctp_mibs();
1254 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1255 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1256 inet_unregister_protosw(&sctp_stream_protosw
);
1257 proto_unregister(&sctp_prot
);
1260 module_init(sctp_init
);
1261 module_exit(sctp_exit
);
1264 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1266 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1267 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1268 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1269 MODULE_LICENSE("GPL");