1 /* SCTP kernel reference 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 reference implementation.
9 * A collection class to handle the storage of transport addresses.
11 * The SCTP reference 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 * The SCTP reference 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 <lksctp-developers@lists.sourceforge.net>
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/sched.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 sctp_bind_addr
*, union sctp_addr
*,
56 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 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
;
71 struct list_head
*pos
;
74 /* All addresses share the same port. */
75 dest
->port
= src
->port
;
77 /* Extract the addresses which are relevant for this scope. */
78 list_for_each(pos
, &src
->address_list
) {
79 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
80 error
= sctp_copy_one_addr(dest
, &addr
->a_h
, scope
,
86 /* If there are no addresses matching the scope and
87 * this is global scope, try to get a link scope address, with
88 * the assumption that we must be sitting behind a NAT.
90 if (list_empty(&dest
->address_list
) && (SCTP_SCOPE_GLOBAL
== scope
)) {
91 list_for_each(pos
, &src
->address_list
) {
92 addr
= list_entry(pos
, struct sctp_sockaddr_entry
,
94 error
= sctp_copy_one_addr(dest
, &addr
->a_h
,
104 sctp_bind_addr_clean(dest
);
109 /* Initialize the SCTP_bind_addr structure for either an endpoint or
112 void sctp_bind_addr_init(struct sctp_bind_addr
*bp
, __u16 port
)
116 INIT_LIST_HEAD(&bp
->address_list
);
120 /* Dispose of the address list. */
121 static void sctp_bind_addr_clean(struct sctp_bind_addr
*bp
)
123 struct sctp_sockaddr_entry
*addr
;
124 struct list_head
*pos
, *temp
;
126 /* Empty the bind address list. */
127 list_for_each_safe(pos
, temp
, &bp
->address_list
) {
128 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
131 SCTP_DBG_OBJCNT_DEC(addr
);
135 /* Dispose of an SCTP_bind_addr structure */
136 void sctp_bind_addr_free(struct sctp_bind_addr
*bp
)
138 /* Empty the bind address list. */
139 sctp_bind_addr_clean(bp
);
143 SCTP_DBG_OBJCNT_DEC(bind_addr
);
147 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
148 int sctp_add_bind_addr(struct sctp_bind_addr
*bp
, union sctp_addr
*new,
149 __u8 use_as_src
, gfp_t gfp
)
151 struct sctp_sockaddr_entry
*addr
;
153 /* Add the address to the bind address list. */
154 addr
= t_new(struct sctp_sockaddr_entry
, gfp
);
158 memcpy(&addr
->a
, new, sizeof(*new));
160 /* Fix up the port if it has not yet been set.
161 * Both v4 and v6 have the port at the same offset.
163 if (!addr
->a
.v4
.sin_port
)
164 addr
->a
.v4
.sin_port
= htons(bp
->port
);
166 flip_to_h(&addr
->a_h
, &addr
->a
);
168 addr
->use_as_src
= use_as_src
;
170 INIT_LIST_HEAD(&addr
->list
);
171 list_add_tail(&addr
->list
, &bp
->address_list
);
172 SCTP_DBG_OBJCNT_INC(addr
);
177 /* Delete an address from the bind address list in the SCTP_bind_addr
180 int sctp_del_bind_addr(struct sctp_bind_addr
*bp
, union sctp_addr
*del_addr
)
182 struct list_head
*pos
, *temp
;
183 struct sctp_sockaddr_entry
*addr
;
185 list_for_each_safe(pos
, temp
, &bp
->address_list
) {
186 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
187 if (sctp_cmp_addr_exact(&addr
->a
, del_addr
)) {
188 /* Found the exact match. */
191 SCTP_DBG_OBJCNT_DEC(addr
);
200 /* Create a network byte-order representation of all the addresses
201 * formated as SCTP parameters.
203 * The second argument is the return value for the length.
205 union sctp_params
sctp_bind_addrs_to_raw(const struct sctp_bind_addr
*bp
,
209 union sctp_params addrparms
;
210 union sctp_params retval
;
212 union sctp_addr_param rawaddr
;
214 struct sctp_sockaddr_entry
*addr
;
215 struct list_head
*pos
;
221 /* Allocate enough memory at once. */
222 list_for_each(pos
, &bp
->address_list
) {
223 len
+= sizeof(union sctp_addr_param
);
226 /* Don't even bother embedding an address if there
229 if (len
== sizeof(union sctp_addr_param
)) {
234 retval
.v
= kmalloc(len
, gfp
);
240 list_for_each(pos
, &bp
->address_list
) {
241 addr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
242 af
= sctp_get_af_specific(addr
->a_h
.v4
.sin_family
);
243 len
= af
->to_addr_param(&addr
->a_h
, &rawaddr
);
244 memcpy(addrparms
.v
, &rawaddr
, len
);
246 addrparms_len
+= len
;
250 *addrs_len
= addrparms_len
;
255 * Create an address list out of the raw address list format (IPv4 and IPv6
256 * address parameters).
258 int sctp_raw_to_bind_addrs(struct sctp_bind_addr
*bp
, __u8
*raw_addr_list
,
259 int addrs_len
, __u16 port
, gfp_t gfp
)
261 union sctp_addr_param
*rawaddr
;
262 struct sctp_paramhdr
*param
;
263 union sctp_addr addr
;
268 /* Convert the raw address to standard address format */
270 param
= (struct sctp_paramhdr
*)raw_addr_list
;
271 rawaddr
= (union sctp_addr_param
*)raw_addr_list
;
273 af
= sctp_get_af_specific(param_type2af(param
->type
));
276 sctp_bind_addr_clean(bp
);
280 af
->from_addr_param(&addr
, rawaddr
, htons(port
), 0);
281 retval
= sctp_add_bind_addr(bp
, &addr
, 1, gfp
);
283 /* Can't finish building the list, clean up. */
284 sctp_bind_addr_clean(bp
);
288 len
= ntohs(param
->length
);
290 raw_addr_list
+= len
;
296 /********************************************************************
297 * 2nd Level Abstractions
298 ********************************************************************/
300 /* Does this contain a specified address? Allow wildcarding. */
301 int sctp_bind_addr_match(struct sctp_bind_addr
*bp
,
302 const union sctp_addr
*addr
,
303 struct sctp_sock
*opt
)
305 struct sctp_sockaddr_entry
*laddr
;
306 struct list_head
*pos
;
308 list_for_each(pos
, &bp
->address_list
) {
309 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
310 if (opt
->pf
->cmp_addr(&laddr
->a
, addr
, opt
))
317 /* Find the first address in the bind address list that is not present in
318 * the addrs packed array.
320 union sctp_addr
*sctp_find_unmatch_addr(struct sctp_bind_addr
*bp
,
321 const union sctp_addr
*addrs
,
323 struct sctp_sock
*opt
)
325 struct sctp_sockaddr_entry
*laddr
;
326 union sctp_addr
*addr
;
329 struct list_head
*pos
;
332 list_for_each(pos
, &bp
->address_list
) {
333 laddr
= list_entry(pos
, struct sctp_sockaddr_entry
, list
);
335 addr_buf
= (union sctp_addr
*)addrs
;
336 for (i
= 0; i
< addrcnt
; i
++) {
337 addr
= (union sctp_addr
*)addr_buf
;
338 af
= sctp_get_af_specific(addr
->v4
.sin_family
);
342 if (opt
->pf
->cmp_addr(&laddr
->a
, addr
, opt
))
345 addr_buf
+= af
->sockaddr_len
;
354 /* Copy out addresses from the global local address list. */
355 static int sctp_copy_one_addr(struct sctp_bind_addr
*dest
,
356 union sctp_addr
*addr
,
357 sctp_scope_t scope
, gfp_t gfp
,
362 flip_to_n(&tmp
, addr
);
364 if (sctp_is_any(addr
)) {
365 error
= sctp_copy_local_addr_list(dest
, scope
, gfp
, flags
);
366 } else if (sctp_in_scope(addr
, scope
)) {
367 /* Now that the address is in scope, check to see if
368 * the address type is supported by local sock as
369 * well as the remote peer.
371 if ((((AF_INET
== addr
->sa
.sa_family
) &&
372 (flags
& SCTP_ADDR4_PEERSUPP
))) ||
373 (((AF_INET6
== addr
->sa
.sa_family
) &&
374 (flags
& SCTP_ADDR6_ALLOWED
) &&
375 (flags
& SCTP_ADDR6_PEERSUPP
))))
376 error
= sctp_add_bind_addr(dest
, &tmp
, 1, gfp
);
382 /* Is this a wildcard address? */
383 int sctp_is_any(const union sctp_addr
*addr
)
385 struct sctp_af
*af
= sctp_get_af_specific(addr
->sa
.sa_family
);
388 return af
->is_any(addr
);
391 /* Is 'addr' valid for 'scope'? */
392 int sctp_in_scope(const union sctp_addr
*addr
, sctp_scope_t scope
)
394 sctp_scope_t addr_scope
= sctp_scope(addr
);
396 /* The unusable SCTP addresses will not be considered with
397 * any defined scopes.
399 if (SCTP_SCOPE_UNUSABLE
== addr_scope
)
402 * For INIT and INIT-ACK address list, let L be the level of
403 * of requested destination address, sender and receiver
404 * SHOULD include all of its addresses with level greater
405 * than or equal to L.
407 if (addr_scope
<= scope
)
413 /********************************************************************
414 * 3rd Level Abstractions
415 ********************************************************************/
417 /* What is the scope of 'addr'? */
418 sctp_scope_t
sctp_scope(const union sctp_addr
*addr
)
422 af
= sctp_get_af_specific(addr
->sa
.sa_family
);
424 return SCTP_SCOPE_UNUSABLE
;
426 return af
->scope((union sctp_addr
*)addr
);