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
;
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 extern int sctp_snmp_proc_init(void);
86 extern int sctp_snmp_proc_exit(void);
87 extern int sctp_eps_proc_init(void);
88 extern int sctp_eps_proc_exit(void);
89 extern int sctp_assocs_proc_init(void);
90 extern int sctp_assocs_proc_exit(void);
92 /* Return the address of the control sock. */
93 struct sock
*sctp_get_ctl_sock(void)
95 return sctp_ctl_socket
->sk
;
98 /* Set up the proc fs entry for the SCTP protocol. */
99 static __init
int sctp_proc_init(void)
101 if (!proc_net_sctp
) {
102 struct proc_dir_entry
*ent
;
103 ent
= proc_mkdir("net/sctp", NULL
);
105 ent
->owner
= THIS_MODULE
;
111 if (sctp_snmp_proc_init())
113 if (sctp_eps_proc_init())
115 if (sctp_assocs_proc_init())
124 /* Clean up the proc fs entry for the SCTP protocol.
125 * Note: Do not make this __exit as it is used in the init error
128 static void sctp_proc_exit(void)
130 sctp_snmp_proc_exit();
131 sctp_eps_proc_exit();
132 sctp_assocs_proc_exit();
135 proc_net_sctp
= NULL
;
136 remove_proc_entry("net/sctp", NULL
);
140 /* Private helper to extract ipv4 address and stash them in
141 * the protocol structure.
143 static void sctp_v4_copy_addrlist(struct list_head
*addrlist
,
144 struct net_device
*dev
)
146 struct in_device
*in_dev
;
147 struct in_ifaddr
*ifa
;
148 struct sctp_sockaddr_entry
*addr
;
151 if ((in_dev
= __in_dev_get_rcu(dev
)) == NULL
) {
156 for (ifa
= in_dev
->ifa_list
; ifa
; ifa
= ifa
->ifa_next
) {
157 /* Add the address to the local list. */
158 addr
= t_new(struct sctp_sockaddr_entry
, GFP_ATOMIC
);
160 addr
->a
.v4
.sin_family
= AF_INET
;
161 addr
->a
.v4
.sin_port
= 0;
162 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
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(void)
175 struct net_device
*dev
;
176 struct list_head
*pos
;
179 read_lock(&dev_base_lock
);
180 for (dev
= dev_base
; dev
; dev
= dev
->next
) {
181 __list_for_each(pos
, &sctp_address_families
) {
182 af
= list_entry(pos
, struct sctp_af
, list
);
183 af
->copy_addrlist(&sctp_local_addr_list
, dev
);
186 read_unlock(&dev_base_lock
);
189 static void sctp_get_local_addr_list(void)
193 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
194 __sctp_get_local_addr_list();
195 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
198 /* Free the existing local addresses. */
199 static void __sctp_free_local_addr_list(void)
201 struct sctp_sockaddr_entry
*addr
;
202 struct list_head
*pos
, *temp
;
204 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
205 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
211 /* Free the existing local addresses. */
212 static void sctp_free_local_addr_list(void)
216 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
217 __sctp_free_local_addr_list();
218 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
221 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
222 int sctp_copy_local_addr_list(struct sctp_bind_addr
*bp
, sctp_scope_t scope
,
223 gfp_t gfp
, int copy_flags
)
225 struct sctp_sockaddr_entry
*addr
;
227 struct list_head
*pos
;
230 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
231 list_for_each(pos
, &sctp_local_addr_list
) {
232 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
233 if (sctp_in_scope(&addr
->a
, scope
)) {
234 /* Now that the address is in scope, check to see if
235 * the address type is really supported by the local
236 * sock as well as the remote peer.
238 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
239 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
240 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
241 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
242 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
243 error
= sctp_add_bind_addr(bp
, &addr
->a
,
252 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
256 /* Initialize a sctp_addr from in incoming skb. */
257 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
264 port
= &addr
->v4
.sin_port
;
265 addr
->v4
.sin_family
= AF_INET
;
267 sh
= (struct sctphdr
*) skb
->h
.raw
;
269 *port
= ntohs(sh
->source
);
270 from
= &skb
->nh
.iph
->saddr
;
272 *port
= ntohs(sh
->dest
);
273 from
= &skb
->nh
.iph
->daddr
;
275 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
278 /* Initialize an sctp_addr from a socket. */
279 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
281 addr
->v4
.sin_family
= AF_INET
;
282 addr
->v4
.sin_port
= inet_sk(sk
)->num
;
283 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->rcv_saddr
;
286 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
287 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
289 inet_sk(sk
)->rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
292 /* Initialize sk->sk_daddr from sctp_addr. */
293 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
295 inet_sk(sk
)->daddr
= addr
->v4
.sin_addr
.s_addr
;
298 /* Initialize a sctp_addr from an address parameter. */
299 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
300 union sctp_addr_param
*param
,
303 addr
->v4
.sin_family
= AF_INET
;
304 addr
->v4
.sin_port
= port
;
305 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
308 /* Initialize an address parameter from a sctp_addr and return the length
309 * of the address parameter.
311 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
312 union sctp_addr_param
*param
)
314 int length
= sizeof(sctp_ipv4addr_param_t
);
316 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
317 param
->v4
.param_hdr
.length
= ntohs(length
);
318 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
323 /* Initialize a sctp_addr from a dst_entry. */
324 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct dst_entry
*dst
,
327 struct rtable
*rt
= (struct rtable
*)dst
;
328 saddr
->v4
.sin_family
= AF_INET
;
329 saddr
->v4
.sin_port
= port
;
330 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
333 /* Compare two addresses exactly. */
334 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
335 const union sctp_addr
*addr2
)
337 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
339 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
341 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
347 /* Initialize addr struct to INADDR_ANY. */
348 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, unsigned short port
)
350 addr
->v4
.sin_family
= AF_INET
;
351 addr
->v4
.sin_addr
.s_addr
= INADDR_ANY
;
352 addr
->v4
.sin_port
= port
;
355 /* Is this a wildcard address? */
356 static int sctp_v4_is_any(const union sctp_addr
*addr
)
358 return INADDR_ANY
== addr
->v4
.sin_addr
.s_addr
;
361 /* This function checks if the address is a valid address to be used for
365 * Return 0 - If the address is a non-unicast or an illegal address.
366 * Return 1 - If the address is a unicast.
368 static int sctp_v4_addr_valid(union sctp_addr
*addr
, struct sctp_sock
*sp
)
370 /* Is this a non-unicast address or a unusable SCTP address? */
371 if (IS_IPV4_UNUSABLE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
))
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 sctp_v4_dst_saddr(&dst_saddr
, dst
, bp
->port
);
484 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
487 sctp_read_unlock(addr_lock
);
489 /* None of the bound addresses match the source address of the
490 * dst. So release it.
496 /* Walk through the bind address list and try to get a dst that
497 * matches a bind address as the source address.
499 sctp_read_lock(addr_lock
);
500 list_for_each(pos
, &bp
->address_list
) {
501 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
503 if (AF_INET
== laddr
->a
.sa
.sa_family
) {
504 fl
.fl4_src
= laddr
->a
.v4
.sin_addr
.s_addr
;
505 if (!ip_route_output_key(&rt
, &fl
)) {
513 sctp_read_unlock(addr_lock
);
516 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
517 NIPQUAD(rt
->rt_dst
), NIPQUAD(rt
->rt_src
));
519 SCTP_DEBUG_PRINTK("NO ROUTE\n");
524 /* For v4, the source address is cached in the route entry(dst). So no need
525 * to cache it separately and hence this is an empty routine.
527 static void sctp_v4_get_saddr(struct sctp_association
*asoc
,
528 struct dst_entry
*dst
,
529 union sctp_addr
*daddr
,
530 union sctp_addr
*saddr
)
532 struct rtable
*rt
= (struct rtable
*)dst
;
538 saddr
->v4
.sin_family
= AF_INET
;
539 saddr
->v4
.sin_port
= asoc
->base
.bind_addr
.port
;
540 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
544 /* What interface did this skb arrive on? */
545 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
547 return ((struct rtable
*)skb
->dst
)->rt_iif
;
550 /* Was this packet marked by Explicit Congestion Notification? */
551 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
553 return INET_ECN_is_ce(skb
->nh
.iph
->tos
);
556 /* Create and initialize a new sk for the socket returned by accept(). */
557 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
558 struct sctp_association
*asoc
)
560 struct inet_sock
*inet
= inet_sk(sk
);
561 struct inet_sock
*newinet
;
562 struct sock
*newsk
= sk_alloc(PF_INET
, GFP_KERNEL
, sk
->sk_prot
, 1);
567 sock_init_data(NULL
, newsk
);
569 newsk
->sk_type
= SOCK_STREAM
;
571 newsk
->sk_no_check
= sk
->sk_no_check
;
572 newsk
->sk_reuse
= sk
->sk_reuse
;
573 newsk
->sk_shutdown
= sk
->sk_shutdown
;
575 newsk
->sk_destruct
= inet_sock_destruct
;
576 newsk
->sk_family
= PF_INET
;
577 newsk
->sk_protocol
= IPPROTO_SCTP
;
578 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
579 sock_reset_flag(newsk
, SOCK_ZAPPED
);
581 newinet
= inet_sk(newsk
);
583 /* Initialize sk's sport, dport, rcv_saddr and daddr for
584 * getsockname() and getpeername()
586 newinet
->sport
= inet
->sport
;
587 newinet
->saddr
= inet
->saddr
;
588 newinet
->rcv_saddr
= inet
->rcv_saddr
;
589 newinet
->dport
= htons(asoc
->peer
.port
);
590 newinet
->daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
591 newinet
->pmtudisc
= inet
->pmtudisc
;
594 newinet
->uc_ttl
= -1;
595 newinet
->mc_loop
= 1;
597 newinet
->mc_index
= 0;
598 newinet
->mc_list
= NULL
;
600 sk_refcnt_debug_inc(newsk
);
602 if (newsk
->sk_prot
->init(newsk
)) {
603 sk_common_release(newsk
);
611 /* Map address, empty for v4 family */
612 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
617 /* Dump the v4 addr to the seq file. */
618 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
620 seq_printf(seq
, "%d.%d.%d.%d ", NIPQUAD(addr
->v4
.sin_addr
));
623 /* Event handler for inet address addition/deletion events.
624 * Basically, whenever there is an event, we re-build our local address list.
626 int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
631 sctp_spin_lock_irqsave(&sctp_local_addr_lock
, flags
);
632 __sctp_free_local_addr_list();
633 __sctp_get_local_addr_list();
634 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock
, flags
);
640 * Initialize the control inode/socket with a control endpoint data
641 * structure. This endpoint is reserved exclusively for the OOTB processing.
643 static int sctp_ctl_sock_init(void)
648 if (sctp_get_pf_specific(PF_INET6
))
653 err
= sock_create_kern(family
, SOCK_SEQPACKET
, IPPROTO_SCTP
,
657 "SCTP: Failed to create the SCTP control socket.\n");
660 sctp_ctl_socket
->sk
->sk_allocation
= GFP_ATOMIC
;
661 inet_sk(sctp_ctl_socket
->sk
)->uc_ttl
= -1;
666 /* Register address family specific functions. */
667 int sctp_register_af(struct sctp_af
*af
)
669 switch (af
->sa_family
) {
671 if (sctp_af_v4_specific
)
673 sctp_af_v4_specific
= af
;
676 if (sctp_af_v6_specific
)
678 sctp_af_v6_specific
= af
;
684 INIT_LIST_HEAD(&af
->list
);
685 list_add_tail(&af
->list
, &sctp_address_families
);
689 /* Get the table of functions for manipulating a particular address
692 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
696 return sctp_af_v4_specific
;
698 return sctp_af_v6_specific
;
704 /* Common code to initialize a AF_INET msg_name. */
705 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
707 struct sockaddr_in
*sin
;
709 sin
= (struct sockaddr_in
*)msgname
;
710 *addr_len
= sizeof(struct sockaddr_in
);
711 sin
->sin_family
= AF_INET
;
712 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
715 /* Copy the primary address of the peer primary address as the msg_name. */
716 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
719 struct sockaddr_in
*sin
, *sinfrom
;
722 struct sctp_association
*asoc
;
725 sctp_inet_msgname(msgname
, addr_len
);
726 sin
= (struct sockaddr_in
*)msgname
;
727 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
728 sin
->sin_port
= htons(asoc
->peer
.port
);
729 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
733 /* Initialize and copy out a msgname from an inbound skb. */
734 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
737 struct sockaddr_in
*sin
;
740 sctp_inet_msgname(msgname
, len
);
741 sin
= (struct sockaddr_in
*)msgname
;
742 sh
= (struct sctphdr
*)skb
->h
.raw
;
743 sin
->sin_port
= sh
->source
;
744 sin
->sin_addr
.s_addr
= skb
->nh
.iph
->saddr
;
748 /* Do we support this AF? */
749 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
751 /* PF_INET only supports AF_INET addresses. */
752 return (AF_INET
== family
);
755 /* Address matching with wildcards allowed. */
756 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
757 const union sctp_addr
*addr2
,
758 struct sctp_sock
*opt
)
760 /* PF_INET only supports AF_INET addresses. */
761 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
763 if (INADDR_ANY
== addr1
->v4
.sin_addr
.s_addr
||
764 INADDR_ANY
== addr2
->v4
.sin_addr
.s_addr
)
766 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
772 /* Verify that provided sockaddr looks bindable. Common verification has
773 * already been taken care of.
775 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
777 return sctp_v4_available(addr
, opt
);
780 /* Verify that sockaddr looks sendable. Common verification has already
781 * been taken care of.
783 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
788 /* Fill in Supported Address Type information for INIT and INIT-ACK
789 * chunks. Returns number of addresses supported.
791 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
794 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
798 /* Wrapper routine that calls the ip transmit routine. */
799 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
800 struct sctp_transport
*transport
, int ipfragok
)
802 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
803 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
804 __FUNCTION__
, skb
, skb
->len
,
805 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_src
),
806 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_dst
));
808 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
809 return ip_queue_xmit(skb
, ipfragok
);
812 static struct sctp_af sctp_ipv4_specific
;
814 static struct sctp_pf sctp_pf_inet
= {
815 .event_msgname
= sctp_inet_event_msgname
,
816 .skb_msgname
= sctp_inet_skb_msgname
,
817 .af_supported
= sctp_inet_af_supported
,
818 .cmp_addr
= sctp_inet_cmp_addr
,
819 .bind_verify
= sctp_inet_bind_verify
,
820 .send_verify
= sctp_inet_send_verify
,
821 .supported_addrs
= sctp_inet_supported_addrs
,
822 .create_accept_sk
= sctp_v4_create_accept_sk
,
823 .addr_v4map
= sctp_v4_addr_v4map
,
824 .af
= &sctp_ipv4_specific
,
827 /* Notifier for inetaddr addition/deletion events. */
828 static struct notifier_block sctp_inetaddr_notifier
= {
829 .notifier_call
= sctp_inetaddr_event
,
832 /* Socket operations. */
833 static const struct proto_ops inet_seqpacket_ops
= {
835 .owner
= THIS_MODULE
,
836 .release
= inet_release
, /* Needs to be wrapped... */
838 .connect
= inet_dgram_connect
,
839 .socketpair
= sock_no_socketpair
,
840 .accept
= inet_accept
,
841 .getname
= inet_getname
, /* Semantics are different. */
844 .listen
= sctp_inet_listen
,
845 .shutdown
= inet_shutdown
, /* Looks harmless. */
846 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem. */
847 .getsockopt
= sock_common_getsockopt
,
849 .compat_setsockopt
= compat_sock_common_setsockopt
,
850 .compat_getsockopt
= compat_sock_common_getsockopt
,
852 .sendmsg
= inet_sendmsg
,
853 .recvmsg
= sock_common_recvmsg
,
854 .mmap
= sock_no_mmap
,
855 .sendpage
= sock_no_sendpage
,
858 /* Registration with AF_INET family. */
859 static struct inet_protosw sctp_seqpacket_protosw
= {
860 .type
= SOCK_SEQPACKET
,
861 .protocol
= IPPROTO_SCTP
,
863 .ops
= &inet_seqpacket_ops
,
866 .flags
= SCTP_PROTOSW_FLAG
868 static struct inet_protosw sctp_stream_protosw
= {
870 .protocol
= IPPROTO_SCTP
,
872 .ops
= &inet_seqpacket_ops
,
875 .flags
= SCTP_PROTOSW_FLAG
878 /* Register with IP layer. */
879 static struct net_protocol sctp_protocol
= {
881 .err_handler
= sctp_v4_err
,
885 /* IPv4 address related functions. */
886 static struct sctp_af sctp_ipv4_specific
= {
887 .sctp_xmit
= sctp_v4_xmit
,
888 .setsockopt
= ip_setsockopt
,
889 .getsockopt
= ip_getsockopt
,
891 .compat_setsockopt
= compat_ip_setsockopt
,
892 .compat_getsockopt
= compat_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
),
915 .sa_family
= AF_INET
,
918 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
922 return sctp_pf_inet_specific
;
924 return sctp_pf_inet6_specific
;
930 /* Register the PF specific function table. */
931 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
935 if (sctp_pf_inet_specific
)
937 sctp_pf_inet_specific
= pf
;
940 if (sctp_pf_inet6_specific
)
942 sctp_pf_inet6_specific
= pf
;
950 static int __init
init_sctp_mibs(void)
952 sctp_statistics
[0] = alloc_percpu(struct sctp_mib
);
953 if (!sctp_statistics
[0])
955 sctp_statistics
[1] = alloc_percpu(struct sctp_mib
);
956 if (!sctp_statistics
[1]) {
957 free_percpu(sctp_statistics
[0]);
964 static void cleanup_sctp_mibs(void)
966 free_percpu(sctp_statistics
[0]);
967 free_percpu(sctp_statistics
[1]);
970 /* Initialize the universe into something sensible. */
971 SCTP_STATIC __init
int sctp_init(void)
974 int status
= -EINVAL
;
978 /* SCTP_DEBUG sanity check. */
979 if (!sctp_sanity_check())
982 status
= proto_register(&sctp_prot
, 1);
986 /* Add SCTP to inet_protos hash table. */
988 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0)
989 goto err_add_protocol
;
991 /* Add SCTP(TCP and UDP style) to inetsw linked list. */
992 inet_register_protosw(&sctp_seqpacket_protosw
);
993 inet_register_protosw(&sctp_stream_protosw
);
995 /* Allocate a cache pools. */
997 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
998 sizeof(struct sctp_bind_bucket
),
999 0, SLAB_HWCACHE_ALIGN
,
1002 if (!sctp_bucket_cachep
)
1003 goto err_bucket_cachep
;
1005 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1006 sizeof(struct sctp_chunk
),
1007 0, SLAB_HWCACHE_ALIGN
,
1009 if (!sctp_chunk_cachep
)
1010 goto err_chunk_cachep
;
1012 /* Allocate and initialise sctp mibs. */
1013 status
= init_sctp_mibs();
1017 /* Initialize proc fs directory. */
1018 status
= sctp_proc_init();
1022 /* Initialize object count debugging. */
1023 sctp_dbg_objcnt_init();
1025 /* Initialize the SCTP specific PF functions. */
1026 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1028 * 14. Suggested SCTP Protocol Parameter Values
1030 /* The following protocol parameters are RECOMMENDED: */
1031 /* RTO.Initial - 3 seconds */
1032 sctp_rto_initial
= SCTP_RTO_INITIAL
;
1033 /* RTO.Min - 1 second */
1034 sctp_rto_min
= SCTP_RTO_MIN
;
1035 /* RTO.Max - 60 seconds */
1036 sctp_rto_max
= SCTP_RTO_MAX
;
1037 /* RTO.Alpha - 1/8 */
1038 sctp_rto_alpha
= SCTP_RTO_ALPHA
;
1039 /* RTO.Beta - 1/4 */
1040 sctp_rto_beta
= SCTP_RTO_BETA
;
1042 /* Valid.Cookie.Life - 60 seconds */
1043 sctp_valid_cookie_life
= 60 * HZ
;
1045 /* Whether Cookie Preservative is enabled(1) or not(0) */
1046 sctp_cookie_preserve_enable
= 1;
1049 sctp_max_burst
= SCTP_MAX_BURST
;
1051 /* Association.Max.Retrans - 10 attempts
1052 * Path.Max.Retrans - 5 attempts (per destination address)
1053 * Max.Init.Retransmits - 8 attempts
1055 sctp_max_retrans_association
= 10;
1056 sctp_max_retrans_path
= 5;
1057 sctp_max_retrans_init
= 8;
1059 /* Sendbuffer growth - do per-socket accounting */
1060 sctp_sndbuf_policy
= 0;
1062 /* Rcvbuffer growth - do per-socket accounting */
1063 sctp_rcvbuf_policy
= 0;
1065 /* HB.interval - 30 seconds */
1066 sctp_hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1068 /* delayed SACK timeout */
1069 sctp_sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1071 /* Implementation specific variables. */
1073 /* Initialize default stream count setup information. */
1074 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1075 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1077 /* Initialize handle used for association ids. */
1078 idr_init(&sctp_assocs_id
);
1080 /* Size and allocate the association hash table.
1081 * The methodology is similar to that of the tcp hash tables.
1083 if (num_physpages
>= (128 * 1024))
1084 goal
= num_physpages
>> (22 - PAGE_SHIFT
);
1086 goal
= num_physpages
>> (24 - PAGE_SHIFT
);
1088 for (order
= 0; (1UL << order
) < goal
; order
++)
1092 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1093 sizeof(struct sctp_hashbucket
);
1094 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1096 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1097 __get_free_pages(GFP_ATOMIC
, order
);
1098 } while (!sctp_assoc_hashtable
&& --order
> 0);
1099 if (!sctp_assoc_hashtable
) {
1100 printk(KERN_ERR
"SCTP: Failed association hash alloc.\n");
1102 goto err_ahash_alloc
;
1104 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1105 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1106 sctp_assoc_hashtable
[i
].chain
= NULL
;
1109 /* Allocate and initialize the endpoint hash table. */
1110 sctp_ep_hashsize
= 64;
1111 sctp_ep_hashtable
= (struct sctp_hashbucket
*)
1112 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1113 if (!sctp_ep_hashtable
) {
1114 printk(KERN_ERR
"SCTP: Failed endpoint_hash alloc.\n");
1116 goto err_ehash_alloc
;
1118 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1119 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1120 sctp_ep_hashtable
[i
].chain
= NULL
;
1123 /* Allocate and initialize the SCTP port hash table. */
1125 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1126 sizeof(struct sctp_bind_hashbucket
);
1127 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1129 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1130 __get_free_pages(GFP_ATOMIC
, order
);
1131 } while (!sctp_port_hashtable
&& --order
> 0);
1132 if (!sctp_port_hashtable
) {
1133 printk(KERN_ERR
"SCTP: Failed bind hash alloc.");
1135 goto err_bhash_alloc
;
1137 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1138 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1139 sctp_port_hashtable
[i
].chain
= NULL
;
1142 spin_lock_init(&sctp_port_alloc_lock
);
1143 sctp_port_rover
= sysctl_local_port_range
[0] - 1;
1145 printk(KERN_INFO
"SCTP: Hash tables configured "
1146 "(established %d bind %d)\n",
1147 sctp_assoc_hashsize
, sctp_port_hashsize
);
1149 /* Disable ADDIP by default. */
1150 sctp_addip_enable
= 0;
1152 /* Enable PR-SCTP by default. */
1153 sctp_prsctp_enable
= 1;
1155 sctp_sysctl_register();
1157 INIT_LIST_HEAD(&sctp_address_families
);
1158 sctp_register_af(&sctp_ipv4_specific
);
1160 status
= sctp_v6_init();
1164 /* Initialize the control inode/socket for handling OOTB packets. */
1165 if ((status
= sctp_ctl_sock_init())) {
1167 "SCTP: Failed to initialize the SCTP control sock.\n");
1168 goto err_ctl_sock_init
;
1171 /* Initialize the local address list. */
1172 INIT_LIST_HEAD(&sctp_local_addr_list
);
1173 spin_lock_init(&sctp_local_addr_lock
);
1175 /* Register notifier for inet address additions/deletions. */
1176 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1178 sctp_get_local_addr_list();
1180 __unsafe(THIS_MODULE
);
1187 sctp_sysctl_unregister();
1188 list_del(&sctp_ipv4_specific
.list
);
1189 free_pages((unsigned long)sctp_port_hashtable
,
1190 get_order(sctp_port_hashsize
*
1191 sizeof(struct sctp_bind_hashbucket
)));
1193 kfree(sctp_ep_hashtable
);
1195 free_pages((unsigned long)sctp_assoc_hashtable
,
1196 get_order(sctp_assoc_hashsize
*
1197 sizeof(struct sctp_hashbucket
)));
1199 sctp_dbg_objcnt_exit();
1202 cleanup_sctp_mibs();
1204 kmem_cache_destroy(sctp_chunk_cachep
);
1206 kmem_cache_destroy(sctp_bucket_cachep
);
1208 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1209 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1210 inet_unregister_protosw(&sctp_stream_protosw
);
1212 proto_unregister(&sctp_prot
);
1216 /* Exit handler for the SCTP protocol. */
1217 SCTP_STATIC __exit
void sctp_exit(void)
1219 /* BUG. This should probably do something useful like clean
1220 * up all the remaining associations and all that memory.
1223 /* Unregister notifier for inet address additions/deletions. */
1224 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1226 /* Free the local address list. */
1227 sctp_free_local_addr_list();
1229 /* Free the control endpoint. */
1230 sock_release(sctp_ctl_socket
);
1233 sctp_sysctl_unregister();
1234 list_del(&sctp_ipv4_specific
.list
);
1236 free_pages((unsigned long)sctp_assoc_hashtable
,
1237 get_order(sctp_assoc_hashsize
*
1238 sizeof(struct sctp_hashbucket
)));
1239 kfree(sctp_ep_hashtable
);
1240 free_pages((unsigned long)sctp_port_hashtable
,
1241 get_order(sctp_port_hashsize
*
1242 sizeof(struct sctp_bind_hashbucket
)));
1244 kmem_cache_destroy(sctp_chunk_cachep
);
1245 kmem_cache_destroy(sctp_bucket_cachep
);
1247 sctp_dbg_objcnt_exit();
1249 cleanup_sctp_mibs();
1251 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1252 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1253 inet_unregister_protosw(&sctp_stream_protosw
);
1254 proto_unregister(&sctp_prot
);
1257 module_init(sctp_init
);
1258 module_exit(sctp_exit
);
1261 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1263 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1264 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1265 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1266 MODULE_LICENSE("GPL");