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 struct kmem_cache
*sctp_chunk_cachep __read_mostly
;
83 struct kmem_cache
*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 INIT_LIST_HEAD(&addr
->list
);
158 INIT_RCU_HEAD(&addr
->rcu
);
159 list_add_tail(&addr
->list
, addrlist
);
166 /* Extract our IP addresses from the system and stash them in the
167 * protocol structure.
169 static void sctp_get_local_addr_list(void)
171 struct net_device
*dev
;
172 struct list_head
*pos
;
175 read_lock(&dev_base_lock
);
176 for_each_netdev(dev
) {
177 __list_for_each(pos
, &sctp_address_families
) {
178 af
= list_entry(pos
, struct sctp_af
, list
);
179 af
->copy_addrlist(&sctp_local_addr_list
, dev
);
182 read_unlock(&dev_base_lock
);
185 /* Free the existing local addresses. */
186 static void sctp_free_local_addr_list(void)
188 struct sctp_sockaddr_entry
*addr
;
189 struct list_head
*pos
, *temp
;
191 list_for_each_safe(pos
, temp
, &sctp_local_addr_list
) {
192 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
198 void sctp_local_addr_free(struct rcu_head
*head
)
200 struct sctp_sockaddr_entry
*e
= container_of(head
,
201 struct sctp_sockaddr_entry
, rcu
);
205 /* Copy the local addresses which are valid for 'scope' into 'bp'. */
206 int sctp_copy_local_addr_list(struct sctp_bind_addr
*bp
, sctp_scope_t scope
,
207 gfp_t gfp
, int copy_flags
)
209 struct sctp_sockaddr_entry
*addr
;
213 list_for_each_entry_rcu(addr
, &sctp_local_addr_list
, list
) {
216 if (sctp_in_scope(&addr
->a
, scope
)) {
217 /* Now that the address is in scope, check to see if
218 * the address type is really supported by the local
219 * sock as well as the remote peer.
221 if ((((AF_INET
== addr
->a
.sa
.sa_family
) &&
222 (copy_flags
& SCTP_ADDR4_PEERSUPP
))) ||
223 (((AF_INET6
== addr
->a
.sa
.sa_family
) &&
224 (copy_flags
& SCTP_ADDR6_ALLOWED
) &&
225 (copy_flags
& SCTP_ADDR6_PEERSUPP
)))) {
226 error
= sctp_add_bind_addr(bp
, &addr
->a
, 1,
239 /* Initialize a sctp_addr from in incoming skb. */
240 static void sctp_v4_from_skb(union sctp_addr
*addr
, struct sk_buff
*skb
,
247 port
= &addr
->v4
.sin_port
;
248 addr
->v4
.sin_family
= AF_INET
;
253 from
= &ip_hdr(skb
)->saddr
;
256 from
= &ip_hdr(skb
)->daddr
;
258 memcpy(&addr
->v4
.sin_addr
.s_addr
, from
, sizeof(struct in_addr
));
261 /* Initialize an sctp_addr from a socket. */
262 static void sctp_v4_from_sk(union sctp_addr
*addr
, struct sock
*sk
)
264 addr
->v4
.sin_family
= AF_INET
;
265 addr
->v4
.sin_port
= 0;
266 addr
->v4
.sin_addr
.s_addr
= inet_sk(sk
)->rcv_saddr
;
269 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
270 static void sctp_v4_to_sk_saddr(union sctp_addr
*addr
, struct sock
*sk
)
272 inet_sk(sk
)->rcv_saddr
= addr
->v4
.sin_addr
.s_addr
;
275 /* Initialize sk->sk_daddr from sctp_addr. */
276 static void sctp_v4_to_sk_daddr(union sctp_addr
*addr
, struct sock
*sk
)
278 inet_sk(sk
)->daddr
= addr
->v4
.sin_addr
.s_addr
;
281 /* Initialize a sctp_addr from an address parameter. */
282 static void sctp_v4_from_addr_param(union sctp_addr
*addr
,
283 union sctp_addr_param
*param
,
284 __be16 port
, int iif
)
286 addr
->v4
.sin_family
= AF_INET
;
287 addr
->v4
.sin_port
= port
;
288 addr
->v4
.sin_addr
.s_addr
= param
->v4
.addr
.s_addr
;
291 /* Initialize an address parameter from a sctp_addr and return the length
292 * of the address parameter.
294 static int sctp_v4_to_addr_param(const union sctp_addr
*addr
,
295 union sctp_addr_param
*param
)
297 int length
= sizeof(sctp_ipv4addr_param_t
);
299 param
->v4
.param_hdr
.type
= SCTP_PARAM_IPV4_ADDRESS
;
300 param
->v4
.param_hdr
.length
= htons(length
);
301 param
->v4
.addr
.s_addr
= addr
->v4
.sin_addr
.s_addr
;
306 /* Initialize a sctp_addr from a dst_entry. */
307 static void sctp_v4_dst_saddr(union sctp_addr
*saddr
, struct dst_entry
*dst
,
310 struct rtable
*rt
= (struct rtable
*)dst
;
311 saddr
->v4
.sin_family
= AF_INET
;
312 saddr
->v4
.sin_port
= port
;
313 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
316 /* Compare two addresses exactly. */
317 static int sctp_v4_cmp_addr(const union sctp_addr
*addr1
,
318 const union sctp_addr
*addr2
)
320 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
322 if (addr1
->v4
.sin_port
!= addr2
->v4
.sin_port
)
324 if (addr1
->v4
.sin_addr
.s_addr
!= addr2
->v4
.sin_addr
.s_addr
)
330 /* Initialize addr struct to INADDR_ANY. */
331 static void sctp_v4_inaddr_any(union sctp_addr
*addr
, __be16 port
)
333 addr
->v4
.sin_family
= AF_INET
;
334 addr
->v4
.sin_addr
.s_addr
= INADDR_ANY
;
335 addr
->v4
.sin_port
= port
;
338 /* Is this a wildcard address? */
339 static int sctp_v4_is_any(const union sctp_addr
*addr
)
341 return INADDR_ANY
== addr
->v4
.sin_addr
.s_addr
;
344 /* This function checks if the address is a valid address to be used for
348 * Return 0 - If the address is a non-unicast or an illegal address.
349 * Return 1 - If the address is a unicast.
351 static int sctp_v4_addr_valid(union sctp_addr
*addr
,
352 struct sctp_sock
*sp
,
353 const struct sk_buff
*skb
)
355 /* Is this a non-unicast address or a unusable SCTP address? */
356 if (IS_IPV4_UNUSABLE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
))
359 /* Is this a broadcast address? */
360 if (skb
&& ((struct rtable
*)skb
->dst
)->rt_flags
& RTCF_BROADCAST
)
366 /* Should this be available for binding? */
367 static int sctp_v4_available(union sctp_addr
*addr
, struct sctp_sock
*sp
)
369 int ret
= inet_addr_type(addr
->v4
.sin_addr
.s_addr
);
372 if (addr
->v4
.sin_addr
.s_addr
!= INADDR_ANY
&&
374 !sp
->inet
.freebind
&&
375 !sysctl_ip_nonlocal_bind
)
381 /* Checking the loopback, private and other address scopes as defined in
382 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4
383 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
385 * Level 0 - unusable SCTP addresses
386 * Level 1 - loopback address
387 * Level 2 - link-local addresses
388 * Level 3 - private addresses.
389 * Level 4 - global addresses
390 * For INIT and INIT-ACK address list, let L be the level of
391 * of requested destination address, sender and receiver
392 * SHOULD include all of its addresses with level greater
393 * than or equal to L.
395 static sctp_scope_t
sctp_v4_scope(union sctp_addr
*addr
)
399 /* Should IPv4 scoping be a sysctl configurable option
400 * so users can turn it off (default on) for certain
401 * unconventional networking environments?
404 /* Check for unusable SCTP addresses. */
405 if (IS_IPV4_UNUSABLE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
406 retval
= SCTP_SCOPE_UNUSABLE
;
407 } else if (LOOPBACK(addr
->v4
.sin_addr
.s_addr
)) {
408 retval
= SCTP_SCOPE_LOOPBACK
;
409 } else if (IS_IPV4_LINK_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
410 retval
= SCTP_SCOPE_LINK
;
411 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr
->v4
.sin_addr
.s_addr
)) {
412 retval
= SCTP_SCOPE_PRIVATE
;
414 retval
= SCTP_SCOPE_GLOBAL
;
420 /* Returns a valid dst cache entry for the given source and destination ip
421 * addresses. If an association is passed, trys to get a dst entry with a
422 * source address that matches an address in the bind address list.
424 static struct dst_entry
*sctp_v4_get_dst(struct sctp_association
*asoc
,
425 union sctp_addr
*daddr
,
426 union sctp_addr
*saddr
)
430 struct sctp_bind_addr
*bp
;
432 struct sctp_sockaddr_entry
*laddr
;
433 struct list_head
*pos
;
434 struct dst_entry
*dst
= NULL
;
435 union sctp_addr dst_saddr
;
437 memset(&fl
, 0x0, sizeof(struct flowi
));
438 fl
.fl4_dst
= daddr
->v4
.sin_addr
.s_addr
;
439 fl
.proto
= IPPROTO_SCTP
;
441 fl
.fl4_tos
= RT_CONN_FLAGS(asoc
->base
.sk
);
442 fl
.oif
= asoc
->base
.sk
->sk_bound_dev_if
;
445 fl
.fl4_src
= saddr
->v4
.sin_addr
.s_addr
;
447 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
448 __FUNCTION__
, NIPQUAD(fl
.fl4_dst
),
449 NIPQUAD(fl
.fl4_src
));
451 if (!ip_route_output_key(&rt
, &fl
)) {
455 /* If there is no association or if a source address is passed, no
456 * more validation is required.
461 bp
= &asoc
->base
.bind_addr
;
462 addr_lock
= &asoc
->base
.addr_lock
;
465 /* Walk through the bind address list and look for a bind
466 * address that matches the source address of the returned dst.
468 sctp_read_lock(addr_lock
);
469 list_for_each(pos
, &bp
->address_list
) {
470 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
,
472 if (!laddr
->use_as_src
)
474 sctp_v4_dst_saddr(&dst_saddr
, dst
, htons(bp
->port
));
475 if (sctp_v4_cmp_addr(&dst_saddr
, &laddr
->a
))
478 sctp_read_unlock(addr_lock
);
480 /* None of the bound addresses match the source address of the
481 * dst. So release it.
487 /* Walk through the bind address list and try to get a dst that
488 * matches a bind address as the source address.
490 sctp_read_lock(addr_lock
);
491 list_for_each(pos
, &bp
->address_list
) {
492 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
494 if ((laddr
->use_as_src
) &&
495 (AF_INET
== laddr
->a
.sa
.sa_family
)) {
496 fl
.fl4_src
= laddr
->a
.v4
.sin_addr
.s_addr
;
497 if (!ip_route_output_key(&rt
, &fl
)) {
505 sctp_read_unlock(addr_lock
);
508 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
509 NIPQUAD(rt
->rt_dst
), NIPQUAD(rt
->rt_src
));
511 SCTP_DEBUG_PRINTK("NO ROUTE\n");
516 /* For v4, the source address is cached in the route entry(dst). So no need
517 * to cache it separately and hence this is an empty routine.
519 static void sctp_v4_get_saddr(struct sctp_association
*asoc
,
520 struct dst_entry
*dst
,
521 union sctp_addr
*daddr
,
522 union sctp_addr
*saddr
)
524 struct rtable
*rt
= (struct rtable
*)dst
;
530 saddr
->v4
.sin_family
= AF_INET
;
531 saddr
->v4
.sin_port
= htons(asoc
->base
.bind_addr
.port
);
532 saddr
->v4
.sin_addr
.s_addr
= rt
->rt_src
;
536 /* What interface did this skb arrive on? */
537 static int sctp_v4_skb_iif(const struct sk_buff
*skb
)
539 return ((struct rtable
*)skb
->dst
)->rt_iif
;
542 /* Was this packet marked by Explicit Congestion Notification? */
543 static int sctp_v4_is_ce(const struct sk_buff
*skb
)
545 return INET_ECN_is_ce(ip_hdr(skb
)->tos
);
548 /* Create and initialize a new sk for the socket returned by accept(). */
549 static struct sock
*sctp_v4_create_accept_sk(struct sock
*sk
,
550 struct sctp_association
*asoc
)
552 struct inet_sock
*inet
= inet_sk(sk
);
553 struct inet_sock
*newinet
;
554 struct sock
*newsk
= sk_alloc(PF_INET
, GFP_KERNEL
, sk
->sk_prot
, 1);
559 sock_init_data(NULL
, newsk
);
561 newsk
->sk_type
= SOCK_STREAM
;
563 newsk
->sk_no_check
= sk
->sk_no_check
;
564 newsk
->sk_reuse
= sk
->sk_reuse
;
565 newsk
->sk_shutdown
= sk
->sk_shutdown
;
567 newsk
->sk_destruct
= inet_sock_destruct
;
568 newsk
->sk_family
= PF_INET
;
569 newsk
->sk_protocol
= IPPROTO_SCTP
;
570 newsk
->sk_backlog_rcv
= sk
->sk_prot
->backlog_rcv
;
571 sock_reset_flag(newsk
, SOCK_ZAPPED
);
573 newinet
= inet_sk(newsk
);
575 /* Initialize sk's sport, dport, rcv_saddr and daddr for
576 * getsockname() and getpeername()
578 newinet
->sport
= inet
->sport
;
579 newinet
->saddr
= inet
->saddr
;
580 newinet
->rcv_saddr
= inet
->rcv_saddr
;
581 newinet
->dport
= htons(asoc
->peer
.port
);
582 newinet
->daddr
= asoc
->peer
.primary_addr
.v4
.sin_addr
.s_addr
;
583 newinet
->pmtudisc
= inet
->pmtudisc
;
584 newinet
->id
= asoc
->next_tsn
^ jiffies
;
586 newinet
->uc_ttl
= -1;
587 newinet
->mc_loop
= 1;
589 newinet
->mc_index
= 0;
590 newinet
->mc_list
= NULL
;
592 sk_refcnt_debug_inc(newsk
);
594 if (newsk
->sk_prot
->init(newsk
)) {
595 sk_common_release(newsk
);
603 /* Map address, empty for v4 family */
604 static void sctp_v4_addr_v4map(struct sctp_sock
*sp
, union sctp_addr
*addr
)
609 /* Dump the v4 addr to the seq file. */
610 static void sctp_v4_seq_dump_addr(struct seq_file
*seq
, union sctp_addr
*addr
)
612 seq_printf(seq
, "%d.%d.%d.%d ", NIPQUAD(addr
->v4
.sin_addr
));
615 /* Event handler for inet address addition/deletion events.
616 * The sctp_local_addr_list needs to be protocted by a spin lock since
617 * multiple notifiers (say IPv4 and IPv6) may be running at the same
618 * time and thus corrupt the list.
619 * The reader side is protected with RCU.
621 static int sctp_inetaddr_event(struct notifier_block
*this, unsigned long ev
,
624 struct in_ifaddr
*ifa
= (struct in_ifaddr
*)ptr
;
625 struct sctp_sockaddr_entry
*addr
= NULL
;
626 struct sctp_sockaddr_entry
*temp
;
630 addr
= kmalloc(sizeof(struct sctp_sockaddr_entry
), GFP_ATOMIC
);
632 addr
->a
.v4
.sin_family
= AF_INET
;
633 addr
->a
.v4
.sin_port
= 0;
634 addr
->a
.v4
.sin_addr
.s_addr
= ifa
->ifa_local
;
636 spin_lock_bh(&sctp_local_addr_lock
);
637 list_add_tail_rcu(&addr
->list
, &sctp_local_addr_list
);
638 spin_unlock_bh(&sctp_local_addr_lock
);
642 spin_lock_bh(&sctp_local_addr_lock
);
643 list_for_each_entry_safe(addr
, temp
,
644 &sctp_local_addr_list
, list
) {
645 if (addr
->a
.v4
.sin_addr
.s_addr
== ifa
->ifa_local
) {
647 list_del_rcu(&addr
->list
);
651 spin_unlock_bh(&sctp_local_addr_lock
);
652 if (addr
&& !addr
->valid
)
653 call_rcu(&addr
->rcu
, sctp_local_addr_free
);
661 * Initialize the control inode/socket with a control endpoint data
662 * structure. This endpoint is reserved exclusively for the OOTB processing.
664 static int sctp_ctl_sock_init(void)
669 if (sctp_get_pf_specific(PF_INET6
))
674 err
= sock_create_kern(family
, SOCK_SEQPACKET
, IPPROTO_SCTP
,
678 "SCTP: Failed to create the SCTP control socket.\n");
681 sctp_ctl_socket
->sk
->sk_allocation
= GFP_ATOMIC
;
682 inet_sk(sctp_ctl_socket
->sk
)->uc_ttl
= -1;
687 /* Register address family specific functions. */
688 int sctp_register_af(struct sctp_af
*af
)
690 switch (af
->sa_family
) {
692 if (sctp_af_v4_specific
)
694 sctp_af_v4_specific
= af
;
697 if (sctp_af_v6_specific
)
699 sctp_af_v6_specific
= af
;
705 INIT_LIST_HEAD(&af
->list
);
706 list_add_tail(&af
->list
, &sctp_address_families
);
710 /* Get the table of functions for manipulating a particular address
713 struct sctp_af
*sctp_get_af_specific(sa_family_t family
)
717 return sctp_af_v4_specific
;
719 return sctp_af_v6_specific
;
725 /* Common code to initialize a AF_INET msg_name. */
726 static void sctp_inet_msgname(char *msgname
, int *addr_len
)
728 struct sockaddr_in
*sin
;
730 sin
= (struct sockaddr_in
*)msgname
;
731 *addr_len
= sizeof(struct sockaddr_in
);
732 sin
->sin_family
= AF_INET
;
733 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
736 /* Copy the primary address of the peer primary address as the msg_name. */
737 static void sctp_inet_event_msgname(struct sctp_ulpevent
*event
, char *msgname
,
740 struct sockaddr_in
*sin
, *sinfrom
;
743 struct sctp_association
*asoc
;
746 sctp_inet_msgname(msgname
, addr_len
);
747 sin
= (struct sockaddr_in
*)msgname
;
748 sinfrom
= &asoc
->peer
.primary_addr
.v4
;
749 sin
->sin_port
= htons(asoc
->peer
.port
);
750 sin
->sin_addr
.s_addr
= sinfrom
->sin_addr
.s_addr
;
754 /* Initialize and copy out a msgname from an inbound skb. */
755 static void sctp_inet_skb_msgname(struct sk_buff
*skb
, char *msgname
, int *len
)
758 struct sctphdr
*sh
= sctp_hdr(skb
);
759 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msgname
;
761 sctp_inet_msgname(msgname
, len
);
762 sin
->sin_port
= sh
->source
;
763 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
767 /* Do we support this AF? */
768 static int sctp_inet_af_supported(sa_family_t family
, struct sctp_sock
*sp
)
770 /* PF_INET only supports AF_INET addresses. */
771 return (AF_INET
== family
);
774 /* Address matching with wildcards allowed. */
775 static int sctp_inet_cmp_addr(const union sctp_addr
*addr1
,
776 const union sctp_addr
*addr2
,
777 struct sctp_sock
*opt
)
779 /* PF_INET only supports AF_INET addresses. */
780 if (addr1
->sa
.sa_family
!= addr2
->sa
.sa_family
)
782 if (INADDR_ANY
== addr1
->v4
.sin_addr
.s_addr
||
783 INADDR_ANY
== addr2
->v4
.sin_addr
.s_addr
)
785 if (addr1
->v4
.sin_addr
.s_addr
== addr2
->v4
.sin_addr
.s_addr
)
791 /* Verify that provided sockaddr looks bindable. Common verification has
792 * already been taken care of.
794 static int sctp_inet_bind_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
796 return sctp_v4_available(addr
, opt
);
799 /* Verify that sockaddr looks sendable. Common verification has already
800 * been taken care of.
802 static int sctp_inet_send_verify(struct sctp_sock
*opt
, union sctp_addr
*addr
)
807 /* Fill in Supported Address Type information for INIT and INIT-ACK
808 * chunks. Returns number of addresses supported.
810 static int sctp_inet_supported_addrs(const struct sctp_sock
*opt
,
813 types
[0] = SCTP_PARAM_IPV4_ADDRESS
;
817 /* Wrapper routine that calls the ip transmit routine. */
818 static inline int sctp_v4_xmit(struct sk_buff
*skb
,
819 struct sctp_transport
*transport
, int ipfragok
)
821 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
822 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
823 __FUNCTION__
, skb
, skb
->len
,
824 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_src
),
825 NIPQUAD(((struct rtable
*)skb
->dst
)->rt_dst
));
827 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS
);
828 return ip_queue_xmit(skb
, ipfragok
);
831 static struct sctp_af sctp_ipv4_specific
;
833 static struct sctp_pf sctp_pf_inet
= {
834 .event_msgname
= sctp_inet_event_msgname
,
835 .skb_msgname
= sctp_inet_skb_msgname
,
836 .af_supported
= sctp_inet_af_supported
,
837 .cmp_addr
= sctp_inet_cmp_addr
,
838 .bind_verify
= sctp_inet_bind_verify
,
839 .send_verify
= sctp_inet_send_verify
,
840 .supported_addrs
= sctp_inet_supported_addrs
,
841 .create_accept_sk
= sctp_v4_create_accept_sk
,
842 .addr_v4map
= sctp_v4_addr_v4map
,
843 .af
= &sctp_ipv4_specific
,
846 /* Notifier for inetaddr addition/deletion events. */
847 static struct notifier_block sctp_inetaddr_notifier
= {
848 .notifier_call
= sctp_inetaddr_event
,
851 /* Socket operations. */
852 static const struct proto_ops inet_seqpacket_ops
= {
854 .owner
= THIS_MODULE
,
855 .release
= inet_release
, /* Needs to be wrapped... */
857 .connect
= inet_dgram_connect
,
858 .socketpair
= sock_no_socketpair
,
859 .accept
= inet_accept
,
860 .getname
= inet_getname
, /* Semantics are different. */
863 .listen
= sctp_inet_listen
,
864 .shutdown
= inet_shutdown
, /* Looks harmless. */
865 .setsockopt
= sock_common_setsockopt
, /* IP_SOL IP_OPTION is a problem */
866 .getsockopt
= sock_common_getsockopt
,
867 .sendmsg
= inet_sendmsg
,
868 .recvmsg
= sock_common_recvmsg
,
869 .mmap
= sock_no_mmap
,
870 .sendpage
= sock_no_sendpage
,
872 .compat_setsockopt
= compat_sock_common_setsockopt
,
873 .compat_getsockopt
= compat_sock_common_getsockopt
,
877 /* Registration with AF_INET family. */
878 static struct inet_protosw sctp_seqpacket_protosw
= {
879 .type
= SOCK_SEQPACKET
,
880 .protocol
= IPPROTO_SCTP
,
882 .ops
= &inet_seqpacket_ops
,
885 .flags
= SCTP_PROTOSW_FLAG
887 static struct inet_protosw sctp_stream_protosw
= {
889 .protocol
= IPPROTO_SCTP
,
891 .ops
= &inet_seqpacket_ops
,
894 .flags
= SCTP_PROTOSW_FLAG
897 /* Register with IP layer. */
898 static struct net_protocol sctp_protocol
= {
900 .err_handler
= sctp_v4_err
,
904 /* IPv4 address related functions. */
905 static struct sctp_af sctp_ipv4_specific
= {
906 .sa_family
= AF_INET
,
907 .sctp_xmit
= sctp_v4_xmit
,
908 .setsockopt
= ip_setsockopt
,
909 .getsockopt
= ip_getsockopt
,
910 .get_dst
= sctp_v4_get_dst
,
911 .get_saddr
= sctp_v4_get_saddr
,
912 .copy_addrlist
= sctp_v4_copy_addrlist
,
913 .from_skb
= sctp_v4_from_skb
,
914 .from_sk
= sctp_v4_from_sk
,
915 .to_sk_saddr
= sctp_v4_to_sk_saddr
,
916 .to_sk_daddr
= sctp_v4_to_sk_daddr
,
917 .from_addr_param
= sctp_v4_from_addr_param
,
918 .to_addr_param
= sctp_v4_to_addr_param
,
919 .dst_saddr
= sctp_v4_dst_saddr
,
920 .cmp_addr
= sctp_v4_cmp_addr
,
921 .addr_valid
= sctp_v4_addr_valid
,
922 .inaddr_any
= sctp_v4_inaddr_any
,
923 .is_any
= sctp_v4_is_any
,
924 .available
= sctp_v4_available
,
925 .scope
= sctp_v4_scope
,
926 .skb_iif
= sctp_v4_skb_iif
,
927 .is_ce
= sctp_v4_is_ce
,
928 .seq_dump_addr
= sctp_v4_seq_dump_addr
,
929 .net_header_len
= sizeof(struct iphdr
),
930 .sockaddr_len
= sizeof(struct sockaddr_in
),
932 .compat_setsockopt
= compat_ip_setsockopt
,
933 .compat_getsockopt
= compat_ip_getsockopt
,
937 struct sctp_pf
*sctp_get_pf_specific(sa_family_t family
) {
941 return sctp_pf_inet_specific
;
943 return sctp_pf_inet6_specific
;
949 /* Register the PF specific function table. */
950 int sctp_register_pf(struct sctp_pf
*pf
, sa_family_t family
)
954 if (sctp_pf_inet_specific
)
956 sctp_pf_inet_specific
= pf
;
959 if (sctp_pf_inet6_specific
)
961 sctp_pf_inet6_specific
= pf
;
969 static int __init
init_sctp_mibs(void)
971 sctp_statistics
[0] = alloc_percpu(struct sctp_mib
);
972 if (!sctp_statistics
[0])
974 sctp_statistics
[1] = alloc_percpu(struct sctp_mib
);
975 if (!sctp_statistics
[1]) {
976 free_percpu(sctp_statistics
[0]);
983 static void cleanup_sctp_mibs(void)
985 free_percpu(sctp_statistics
[0]);
986 free_percpu(sctp_statistics
[1]);
989 /* Initialize the universe into something sensible. */
990 SCTP_STATIC __init
int sctp_init(void)
993 int status
= -EINVAL
;
997 /* SCTP_DEBUG sanity check. */
998 if (!sctp_sanity_check())
1001 /* Allocate bind_bucket and chunk caches. */
1003 sctp_bucket_cachep
= kmem_cache_create("sctp_bind_bucket",
1004 sizeof(struct sctp_bind_bucket
),
1005 0, SLAB_HWCACHE_ALIGN
,
1007 if (!sctp_bucket_cachep
)
1010 sctp_chunk_cachep
= kmem_cache_create("sctp_chunk",
1011 sizeof(struct sctp_chunk
),
1012 0, SLAB_HWCACHE_ALIGN
,
1014 if (!sctp_chunk_cachep
)
1015 goto err_chunk_cachep
;
1017 /* Allocate and initialise sctp mibs. */
1018 status
= init_sctp_mibs();
1022 /* Initialize proc fs directory. */
1023 status
= sctp_proc_init();
1027 /* Initialize object count debugging. */
1028 sctp_dbg_objcnt_init();
1030 /* Initialize the SCTP specific PF functions. */
1031 sctp_register_pf(&sctp_pf_inet
, PF_INET
);
1033 * 14. Suggested SCTP Protocol Parameter Values
1035 /* The following protocol parameters are RECOMMENDED: */
1036 /* RTO.Initial - 3 seconds */
1037 sctp_rto_initial
= SCTP_RTO_INITIAL
;
1038 /* RTO.Min - 1 second */
1039 sctp_rto_min
= SCTP_RTO_MIN
;
1040 /* RTO.Max - 60 seconds */
1041 sctp_rto_max
= SCTP_RTO_MAX
;
1042 /* RTO.Alpha - 1/8 */
1043 sctp_rto_alpha
= SCTP_RTO_ALPHA
;
1044 /* RTO.Beta - 1/4 */
1045 sctp_rto_beta
= SCTP_RTO_BETA
;
1047 /* Valid.Cookie.Life - 60 seconds */
1048 sctp_valid_cookie_life
= SCTP_DEFAULT_COOKIE_LIFE
;
1050 /* Whether Cookie Preservative is enabled(1) or not(0) */
1051 sctp_cookie_preserve_enable
= 1;
1054 sctp_max_burst
= SCTP_DEFAULT_MAX_BURST
;
1056 /* Association.Max.Retrans - 10 attempts
1057 * Path.Max.Retrans - 5 attempts (per destination address)
1058 * Max.Init.Retransmits - 8 attempts
1060 sctp_max_retrans_association
= 10;
1061 sctp_max_retrans_path
= 5;
1062 sctp_max_retrans_init
= 8;
1064 /* Sendbuffer growth - do per-socket accounting */
1065 sctp_sndbuf_policy
= 0;
1067 /* Rcvbuffer growth - do per-socket accounting */
1068 sctp_rcvbuf_policy
= 0;
1070 /* HB.interval - 30 seconds */
1071 sctp_hb_interval
= SCTP_DEFAULT_TIMEOUT_HEARTBEAT
;
1073 /* delayed SACK timeout */
1074 sctp_sack_timeout
= SCTP_DEFAULT_TIMEOUT_SACK
;
1076 /* Implementation specific variables. */
1078 /* Initialize default stream count setup information. */
1079 sctp_max_instreams
= SCTP_DEFAULT_INSTREAMS
;
1080 sctp_max_outstreams
= SCTP_DEFAULT_OUTSTREAMS
;
1082 /* Initialize handle used for association ids. */
1083 idr_init(&sctp_assocs_id
);
1085 /* Size and allocate the association hash table.
1086 * The methodology is similar to that of the tcp hash tables.
1088 if (num_physpages
>= (128 * 1024))
1089 goal
= num_physpages
>> (22 - PAGE_SHIFT
);
1091 goal
= num_physpages
>> (24 - PAGE_SHIFT
);
1093 for (order
= 0; (1UL << order
) < goal
; order
++)
1097 sctp_assoc_hashsize
= (1UL << order
) * PAGE_SIZE
/
1098 sizeof(struct sctp_hashbucket
);
1099 if ((sctp_assoc_hashsize
> (64 * 1024)) && order
> 0)
1101 sctp_assoc_hashtable
= (struct sctp_hashbucket
*)
1102 __get_free_pages(GFP_ATOMIC
, order
);
1103 } while (!sctp_assoc_hashtable
&& --order
> 0);
1104 if (!sctp_assoc_hashtable
) {
1105 printk(KERN_ERR
"SCTP: Failed association hash alloc.\n");
1107 goto err_ahash_alloc
;
1109 for (i
= 0; i
< sctp_assoc_hashsize
; i
++) {
1110 rwlock_init(&sctp_assoc_hashtable
[i
].lock
);
1111 sctp_assoc_hashtable
[i
].chain
= NULL
;
1114 /* Allocate and initialize the endpoint hash table. */
1115 sctp_ep_hashsize
= 64;
1116 sctp_ep_hashtable
= (struct sctp_hashbucket
*)
1117 kmalloc(64 * sizeof(struct sctp_hashbucket
), GFP_KERNEL
);
1118 if (!sctp_ep_hashtable
) {
1119 printk(KERN_ERR
"SCTP: Failed endpoint_hash alloc.\n");
1121 goto err_ehash_alloc
;
1123 for (i
= 0; i
< sctp_ep_hashsize
; i
++) {
1124 rwlock_init(&sctp_ep_hashtable
[i
].lock
);
1125 sctp_ep_hashtable
[i
].chain
= NULL
;
1128 /* Allocate and initialize the SCTP port hash table. */
1130 sctp_port_hashsize
= (1UL << order
) * PAGE_SIZE
/
1131 sizeof(struct sctp_bind_hashbucket
);
1132 if ((sctp_port_hashsize
> (64 * 1024)) && order
> 0)
1134 sctp_port_hashtable
= (struct sctp_bind_hashbucket
*)
1135 __get_free_pages(GFP_ATOMIC
, order
);
1136 } while (!sctp_port_hashtable
&& --order
> 0);
1137 if (!sctp_port_hashtable
) {
1138 printk(KERN_ERR
"SCTP: Failed bind hash alloc.");
1140 goto err_bhash_alloc
;
1142 for (i
= 0; i
< sctp_port_hashsize
; i
++) {
1143 spin_lock_init(&sctp_port_hashtable
[i
].lock
);
1144 sctp_port_hashtable
[i
].chain
= NULL
;
1147 spin_lock_init(&sctp_port_alloc_lock
);
1148 sctp_port_rover
= sysctl_local_port_range
[0] - 1;
1150 printk(KERN_INFO
"SCTP: Hash tables configured "
1151 "(established %d bind %d)\n",
1152 sctp_assoc_hashsize
, sctp_port_hashsize
);
1154 /* Disable ADDIP by default. */
1155 sctp_addip_enable
= 0;
1157 /* Enable PR-SCTP by default. */
1158 sctp_prsctp_enable
= 1;
1160 sctp_sysctl_register();
1162 INIT_LIST_HEAD(&sctp_address_families
);
1163 sctp_register_af(&sctp_ipv4_specific
);
1165 status
= proto_register(&sctp_prot
, 1);
1167 goto err_proto_register
;
1169 /* Register SCTP(UDP and TCP style) with socket layer. */
1170 inet_register_protosw(&sctp_seqpacket_protosw
);
1171 inet_register_protosw(&sctp_stream_protosw
);
1173 status
= sctp_v6_init();
1177 /* Initialize the control inode/socket for handling OOTB packets. */
1178 if ((status
= sctp_ctl_sock_init())) {
1180 "SCTP: Failed to initialize the SCTP control sock.\n");
1181 goto err_ctl_sock_init
;
1184 /* Initialize the local address list. */
1185 INIT_LIST_HEAD(&sctp_local_addr_list
);
1186 spin_lock_init(&sctp_local_addr_lock
);
1187 sctp_get_local_addr_list();
1189 /* Register notifier for inet address additions/deletions. */
1190 register_inetaddr_notifier(&sctp_inetaddr_notifier
);
1192 /* Register SCTP with inet layer. */
1193 if (inet_add_protocol(&sctp_protocol
, IPPROTO_SCTP
) < 0) {
1195 goto err_add_protocol
;
1198 /* Register SCTP with inet6 layer. */
1199 status
= sctp_v6_add_protocol();
1201 goto err_v6_add_protocol
;
1203 __unsafe(THIS_MODULE
);
1207 err_v6_add_protocol
:
1208 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1209 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1211 sctp_free_local_addr_list();
1212 sock_release(sctp_ctl_socket
);
1216 inet_unregister_protosw(&sctp_stream_protosw
);
1217 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1218 proto_unregister(&sctp_prot
);
1220 sctp_sysctl_unregister();
1221 list_del(&sctp_ipv4_specific
.list
);
1222 free_pages((unsigned long)sctp_port_hashtable
,
1223 get_order(sctp_port_hashsize
*
1224 sizeof(struct sctp_bind_hashbucket
)));
1226 kfree(sctp_ep_hashtable
);
1228 free_pages((unsigned long)sctp_assoc_hashtable
,
1229 get_order(sctp_assoc_hashsize
*
1230 sizeof(struct sctp_hashbucket
)));
1232 sctp_dbg_objcnt_exit();
1235 cleanup_sctp_mibs();
1237 kmem_cache_destroy(sctp_chunk_cachep
);
1239 kmem_cache_destroy(sctp_bucket_cachep
);
1243 /* Exit handler for the SCTP protocol. */
1244 SCTP_STATIC __exit
void sctp_exit(void)
1246 /* BUG. This should probably do something useful like clean
1247 * up all the remaining associations and all that memory.
1250 /* Unregister with inet6/inet layers. */
1251 sctp_v6_del_protocol();
1252 inet_del_protocol(&sctp_protocol
, IPPROTO_SCTP
);
1254 /* Unregister notifier for inet address additions/deletions. */
1255 unregister_inetaddr_notifier(&sctp_inetaddr_notifier
);
1257 /* Free the local address list. */
1258 sctp_free_local_addr_list();
1260 /* Free the control endpoint. */
1261 sock_release(sctp_ctl_socket
);
1263 /* Cleanup v6 initializations. */
1266 /* Unregister with socket layer. */
1267 inet_unregister_protosw(&sctp_stream_protosw
);
1268 inet_unregister_protosw(&sctp_seqpacket_protosw
);
1270 sctp_sysctl_unregister();
1271 list_del(&sctp_ipv4_specific
.list
);
1273 free_pages((unsigned long)sctp_assoc_hashtable
,
1274 get_order(sctp_assoc_hashsize
*
1275 sizeof(struct sctp_hashbucket
)));
1276 kfree(sctp_ep_hashtable
);
1277 free_pages((unsigned long)sctp_port_hashtable
,
1278 get_order(sctp_port_hashsize
*
1279 sizeof(struct sctp_bind_hashbucket
)));
1281 sctp_dbg_objcnt_exit();
1283 cleanup_sctp_mibs();
1285 kmem_cache_destroy(sctp_chunk_cachep
);
1286 kmem_cache_destroy(sctp_bucket_cachep
);
1288 proto_unregister(&sctp_prot
);
1291 module_init(sctp_init
);
1292 module_exit(sctp_exit
);
1295 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1297 MODULE_ALIAS("net-pf-" __stringify(PF_INET
) "-proto-132");
1298 MODULE_ALIAS("net-pf-" __stringify(PF_INET6
) "-proto-132");
1299 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1300 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1301 MODULE_LICENSE("GPL");