1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2003
3 * Copyright (c) Cisco 1999,2000
4 * Copyright (c) Motorola 1999,2000,2001
5 * Copyright (c) La Monte H.P. Yarroll 2001
7 * This file is part of the SCTP kernel implementation.
9 * A collection class to handle the storage of transport addresses.
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
28 * Please send any bug reports or fixes you make to the
30 * lksctp developers <linux-sctp@vger.kernel.org>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
35 * Written or modified by:
36 * La Monte H.P. Yarroll <piggy@acm.org>
37 * Karl Knutson <karl@athena.chicago.il.us>
38 * Jon Grimm <jgrimm@us.ibm.com>
39 * Daisy Chang <daisyc@us.ibm.com>
41 * Any bugs reported given to us we will try to fix... any fixes shared will
42 * be incorporated into the next SCTP release.
45 #include <linux/types.h>
46 #include <linux/slab.h>
50 #include <net/if_inet6.h>
51 #include <net/sctp/sctp.h>
52 #include <net/sctp/sm.h>
54 /* Forward declarations for internal helpers. */
55 static int sctp_copy_one_addr(struct net
*, struct sctp_bind_addr
*,
56 union sctp_addr
*, sctp_scope_t scope
, gfp_t gfp
,
58 static void sctp_bind_addr_clean(struct sctp_bind_addr
*);
60 /* First Level Abstractions. */
62 /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
63 * in 'src' which have a broader scope than 'scope'.
65 int sctp_bind_addr_copy(struct net
*net
, struct sctp_bind_addr
*dest
,
66 const struct sctp_bind_addr
*src
,
67 sctp_scope_t scope
, gfp_t gfp
,
70 struct sctp_sockaddr_entry
*addr
;
73 /* All addresses share the same port. */
74 dest
->port
= src
->port
;
76 /* Extract the addresses which are relevant for this scope. */
77 list_for_each_entry(addr
, &src
->address_list
, list
) {
78 error
= sctp_copy_one_addr(net
, dest
, &addr
->a
, scope
,
84 /* If there are no addresses matching the scope and
85 * this is global scope, try to get a link scope address, with
86 * the assumption that we must be sitting behind a NAT.
88 if (list_empty(&dest
->address_list
) && (SCTP_SCOPE_GLOBAL
== scope
)) {
89 list_for_each_entry(addr
, &src
->address_list
, list
) {
90 error
= sctp_copy_one_addr(net
, dest
, &addr
->a
,
100 sctp_bind_addr_clean(dest
);
105 /* Exactly duplicate the address lists. This is necessary when doing
106 * peer-offs and accepts. We don't want to put all the current system
107 * addresses into the endpoint. That's useless. But we do want duplicat
108 * the list of bound addresses that the older endpoint used.
110 int sctp_bind_addr_dup(struct sctp_bind_addr
*dest
,
111 const struct sctp_bind_addr
*src
,
114 struct sctp_sockaddr_entry
*addr
;
117 /* All addresses share the same port. */
118 dest
->port
= src
->port
;
120 list_for_each_entry(addr
, &src
->address_list
, list
) {
121 error
= sctp_add_bind_addr(dest
, &addr
->a
, 1, gfp
);
129 /* Initialize the SCTP_bind_addr structure for either an endpoint or
132 void sctp_bind_addr_init(struct sctp_bind_addr
*bp
, __u16 port
)
134 INIT_LIST_HEAD(&bp
->address_list
);
138 /* Dispose of the address list. */
139 static void sctp_bind_addr_clean(struct sctp_bind_addr
*bp
)
141 struct sctp_sockaddr_entry
*addr
, *temp
;
143 /* Empty the bind address list. */
144 list_for_each_entry_safe(addr
, temp
, &bp
->address_list
, list
) {
145 list_del_rcu(&addr
->list
);
146 kfree_rcu(addr
, rcu
);
147 SCTP_DBG_OBJCNT_DEC(addr
);
151 /* Dispose of an SCTP_bind_addr structure */
152 void sctp_bind_addr_free(struct sctp_bind_addr
*bp
)
154 /* Empty the bind address list. */
155 sctp_bind_addr_clean(bp
);
158 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
159 int sctp_add_bind_addr(struct sctp_bind_addr
*bp
, union sctp_addr
*new,
160 __u8 addr_state
, gfp_t gfp
)
162 struct sctp_sockaddr_entry
*addr
;
164 /* Add the address to the bind address list. */
165 addr
= kzalloc(sizeof(*addr
), gfp
);
169 memcpy(&addr
->a
, new, sizeof(*new));
171 /* Fix up the port if it has not yet been set.
172 * Both v4 and v6 have the port at the same offset.
174 if (!addr
->a
.v4
.sin_port
)
175 addr
->a
.v4
.sin_port
= htons(bp
->port
);
177 addr
->state
= addr_state
;
180 INIT_LIST_HEAD(&addr
->list
);
182 /* We always hold a socket lock when calling this function,
183 * and that acts as a writer synchronizing lock.
185 list_add_tail_rcu(&addr
->list
, &bp
->address_list
);
186 SCTP_DBG_OBJCNT_INC(addr
);
191 /* Delete an address from the bind address list in the SCTP_bind_addr
194 int sctp_del_bind_addr(struct sctp_bind_addr
*bp
, union sctp_addr
*del_addr
)
196 struct sctp_sockaddr_entry
*addr
, *temp
;
199 /* We hold the socket lock when calling this function,
200 * and that acts as a writer synchronizing lock.
202 list_for_each_entry_safe(addr
, temp
, &bp
->address_list
, list
) {
203 if (sctp_cmp_addr_exact(&addr
->a
, del_addr
)) {
204 /* Found the exact match. */
207 list_del_rcu(&addr
->list
);
213 kfree_rcu(addr
, rcu
);
214 SCTP_DBG_OBJCNT_DEC(addr
);
221 /* Create a network byte-order representation of all the addresses
222 * formated as SCTP parameters.
224 * The second argument is the return value for the length.
226 union sctp_params
sctp_bind_addrs_to_raw(const struct sctp_bind_addr
*bp
,
230 union sctp_params addrparms
;
231 union sctp_params retval
;
233 union sctp_addr_param rawaddr
;
235 struct sctp_sockaddr_entry
*addr
;
236 struct list_head
*pos
;
242 /* Allocate enough memory at once. */
243 list_for_each(pos
, &bp
->address_list
) {
244 len
+= sizeof(union sctp_addr_param
);
247 /* Don't even bother embedding an address if there
250 if (len
== sizeof(union sctp_addr_param
)) {
255 retval
.v
= kmalloc(len
, gfp
);
261 list_for_each_entry(addr
, &bp
->address_list
, list
) {
262 af
= sctp_get_af_specific(addr
->a
.v4
.sin_family
);
263 len
= af
->to_addr_param(&addr
->a
, &rawaddr
);
264 memcpy(addrparms
.v
, &rawaddr
, len
);
266 addrparms_len
+= len
;
270 *addrs_len
= addrparms_len
;
275 * Create an address list out of the raw address list format (IPv4 and IPv6
276 * address parameters).
278 int sctp_raw_to_bind_addrs(struct sctp_bind_addr
*bp
, __u8
*raw_addr_list
,
279 int addrs_len
, __u16 port
, gfp_t gfp
)
281 union sctp_addr_param
*rawaddr
;
282 struct sctp_paramhdr
*param
;
283 union sctp_addr addr
;
288 /* Convert the raw address to standard address format */
290 param
= (struct sctp_paramhdr
*)raw_addr_list
;
291 rawaddr
= (union sctp_addr_param
*)raw_addr_list
;
293 af
= sctp_get_af_specific(param_type2af(param
->type
));
296 sctp_bind_addr_clean(bp
);
300 af
->from_addr_param(&addr
, rawaddr
, htons(port
), 0);
301 retval
= sctp_add_bind_addr(bp
, &addr
, SCTP_ADDR_SRC
, gfp
);
303 /* Can't finish building the list, clean up. */
304 sctp_bind_addr_clean(bp
);
308 len
= ntohs(param
->length
);
310 raw_addr_list
+= len
;
316 /********************************************************************
317 * 2nd Level Abstractions
318 ********************************************************************/
320 /* Does this contain a specified address? Allow wildcarding. */
321 int sctp_bind_addr_match(struct sctp_bind_addr
*bp
,
322 const union sctp_addr
*addr
,
323 struct sctp_sock
*opt
)
325 struct sctp_sockaddr_entry
*laddr
;
329 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
332 if (opt
->pf
->cmp_addr(&laddr
->a
, addr
, opt
)) {
342 /* Does the address 'addr' conflict with any addresses in
345 int sctp_bind_addr_conflict(struct sctp_bind_addr
*bp
,
346 const union sctp_addr
*addr
,
347 struct sctp_sock
*bp_sp
,
348 struct sctp_sock
*addr_sp
)
350 struct sctp_sockaddr_entry
*laddr
;
352 struct sctp_sock
*sp
;
354 /* Pick the IPv6 socket as the basis of comparison
355 * since it's usually a superset of the IPv4.
356 * If there is no IPv6 socket, then default to bind_addr.
358 if (sctp_opt2sk(bp_sp
)->sk_family
== AF_INET6
)
360 else if (sctp_opt2sk(addr_sp
)->sk_family
== AF_INET6
)
366 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
370 conflict
= sp
->pf
->cmp_addr(&laddr
->a
, addr
, sp
);
379 /* Get the state of the entry in the bind_addr_list */
380 int sctp_bind_addr_state(const struct sctp_bind_addr
*bp
,
381 const union sctp_addr
*addr
)
383 struct sctp_sockaddr_entry
*laddr
;
387 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
392 list_for_each_entry_rcu(laddr
, &bp
->address_list
, list
) {
395 if (af
->cmp_addr(&laddr
->a
, addr
)) {
396 state
= laddr
->state
;
405 /* Find the first address in the bind address list that is not present in
406 * the addrs packed array.
408 union sctp_addr
*sctp_find_unmatch_addr(struct sctp_bind_addr
*bp
,
409 const union sctp_addr
*addrs
,
411 struct sctp_sock
*opt
)
413 struct sctp_sockaddr_entry
*laddr
;
414 union sctp_addr
*addr
;
419 /* This is only called sctp_send_asconf_del_ip() and we hold
420 * the socket lock in that code patch, so that address list
423 list_for_each_entry(laddr
, &bp
->address_list
, list
) {
424 addr_buf
= (union sctp_addr
*)addrs
;
425 for (i
= 0; i
< addrcnt
; i
++) {
427 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
431 if (opt
->pf
->cmp_addr(&laddr
->a
, addr
, opt
))
434 addr_buf
+= af
->sockaddr_len
;
443 /* Copy out addresses from the global local address list. */
444 static int sctp_copy_one_addr(struct net
*net
, struct sctp_bind_addr
*dest
,
445 union sctp_addr
*addr
,
446 sctp_scope_t scope
, gfp_t gfp
,
451 if (sctp_is_any(NULL
, addr
)) {
452 error
= sctp_copy_local_addr_list(net
, dest
, scope
, gfp
, flags
);
453 } else if (sctp_in_scope(net
, addr
, scope
)) {
454 /* Now that the address is in scope, check to see if
455 * the address type is supported by local sock as
456 * well as the remote peer.
458 if ((((AF_INET
== addr
->sa
.sa_family
) &&
459 (flags
& SCTP_ADDR4_PEERSUPP
))) ||
460 (((AF_INET6
== addr
->sa
.sa_family
) &&
461 (flags
& SCTP_ADDR6_ALLOWED
) &&
462 (flags
& SCTP_ADDR6_PEERSUPP
))))
463 error
= sctp_add_bind_addr(dest
, addr
, SCTP_ADDR_SRC
,
470 /* Is this a wildcard address? */
471 int sctp_is_any(struct sock
*sk
, const union sctp_addr
*addr
)
473 unsigned short fam
= 0;
476 /* Try to get the right address family */
477 if (addr
->sa
.sa_family
!= AF_UNSPEC
)
478 fam
= addr
->sa
.sa_family
;
482 af
= sctp_get_af_specific(fam
);
486 return af
->is_any(addr
);
489 /* Is 'addr' valid for 'scope'? */
490 int sctp_in_scope(struct net
*net
, const union sctp_addr
*addr
, sctp_scope_t scope
)
492 sctp_scope_t addr_scope
= sctp_scope(addr
);
494 /* The unusable SCTP addresses will not be considered with
495 * any defined scopes.
497 if (SCTP_SCOPE_UNUSABLE
== addr_scope
)
500 * For INIT and INIT-ACK address list, let L be the level of
501 * of requested destination address, sender and receiver
502 * SHOULD include all of its addresses with level greater
503 * than or equal to L.
505 * Address scoping can be selectively controlled via sysctl
508 switch (net
->sctp
.scope_policy
) {
509 case SCTP_SCOPE_POLICY_DISABLE
:
511 case SCTP_SCOPE_POLICY_ENABLE
:
512 if (addr_scope
<= scope
)
515 case SCTP_SCOPE_POLICY_PRIVATE
:
516 if (addr_scope
<= scope
|| SCTP_SCOPE_PRIVATE
== addr_scope
)
519 case SCTP_SCOPE_POLICY_LINK
:
520 if (addr_scope
<= scope
|| SCTP_SCOPE_LINK
== addr_scope
)
530 int sctp_is_ep_boundall(struct sock
*sk
)
532 struct sctp_bind_addr
*bp
;
533 struct sctp_sockaddr_entry
*addr
;
535 bp
= &sctp_sk(sk
)->ep
->base
.bind_addr
;
536 if (sctp_list_single_entry(&bp
->address_list
)) {
537 addr
= list_entry(bp
->address_list
.next
,
538 struct sctp_sockaddr_entry
, list
);
539 if (sctp_is_any(sk
, &addr
->a
))
545 /********************************************************************
546 * 3rd Level Abstractions
547 ********************************************************************/
549 /* What is the scope of 'addr'? */
550 sctp_scope_t
sctp_scope(const union sctp_addr
*addr
)
554 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
556 return SCTP_SCOPE_UNUSABLE
;
558 return af
->scope((union sctp_addr
*)addr
);