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Linux/net/sctp/bind_addr.c

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  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
  6  *
  7  * This file is part of the SCTP kernel implementation.
  8  *
  9  * A collection class to handle the storage of transport addresses.
 10  *
 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)
 15  * any later version.
 16  *
 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.
 22  *
 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.
 27  *
 28  * Please send any bug reports or fixes you make to the
 29  * email address(es):
 30  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 31  *
 32  * Or submit a bug report through the following website:
 33  *    http://www.sf.net/projects/lksctp
 34  *
 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>
 40  *
 41  * Any bugs reported given to us we will try to fix... any fixes shared will
 42  * be incorporated into the next SCTP release.
 43  */
 44 
 45 #include <linux/types.h>
 46 #include <linux/slab.h>
 47 #include <linux/in.h>
 48 #include <net/sock.h>
 49 #include <net/ipv6.h>
 50 #include <net/if_inet6.h>
 51 #include <net/sctp/sctp.h>
 52 #include <net/sctp/sm.h>
 53 
 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,
 57                               int flags);
 58 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
 59 
 60 /* First Level Abstractions. */
 61 
 62 /* Copy 'src' to 'dest' taking 'scope' into account.  Omit addresses
 63  * in 'src' which have a broader scope than 'scope'.
 64  */
 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,
 68                         int flags)
 69 {
 70         struct sctp_sockaddr_entry *addr;
 71         int error = 0;
 72 
 73         /* All addresses share the same port.  */
 74         dest->port = src->port;
 75 
 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(dest, &addr->a, scope,
 79                                            gfp, flags);
 80                 if (error < 0)
 81                         goto out;
 82         }
 83 
 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.
 87          */
 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(dest, &addr->a,
 91                                                    SCTP_SCOPE_LINK, gfp,
 92                                                    flags);
 93                         if (error < 0)
 94                                 goto out;
 95                 }
 96         }
 97 
 98 out:
 99         if (error)
100                 sctp_bind_addr_clean(dest);
101 
102         return error;
103 }
104 
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.
109  */
110 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
111                         const struct sctp_bind_addr *src,
112                         gfp_t gfp)
113 {
114         struct sctp_sockaddr_entry *addr;
115         int error = 0;
116 
117         /* All addresses share the same port.  */
118         dest->port = src->port;
119 
120         list_for_each_entry(addr, &src->address_list, list) {
121                 error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
122                 if (error < 0)
123                         break;
124         }
125 
126         return error;
127 }
128 
129 /* Initialize the SCTP_bind_addr structure for either an endpoint or
130  * an association.
131  */
132 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
133 {
134         bp->malloced = 0;
135 
136         INIT_LIST_HEAD(&bp->address_list);
137         bp->port = port;
138 }
139 
140 /* Dispose of the address list. */
141 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
142 {
143         struct sctp_sockaddr_entry *addr, *temp;
144 
145         /* Empty the bind address list. */
146         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
147                 list_del_rcu(&addr->list);
148                 kfree_rcu(addr, rcu);
149                 SCTP_DBG_OBJCNT_DEC(addr);
150         }
151 }
152 
153 /* Dispose of an SCTP_bind_addr structure  */
154 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
155 {
156         /* Empty the bind address list. */
157         sctp_bind_addr_clean(bp);
158 
159         if (bp->malloced) {
160                 kfree(bp);
161                 SCTP_DBG_OBJCNT_DEC(bind_addr);
162         }
163 }
164 
165 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
166 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
167                        __u8 addr_state, gfp_t gfp)
168 {
169         struct sctp_sockaddr_entry *addr;
170 
171         /* Add the address to the bind address list.  */
172         addr = t_new(struct sctp_sockaddr_entry, gfp);
173         if (!addr)
174                 return -ENOMEM;
175 
176         memcpy(&addr->a, new, sizeof(*new));
177 
178         /* Fix up the port if it has not yet been set.
179          * Both v4 and v6 have the port at the same offset.
180          */
181         if (!addr->a.v4.sin_port)
182                 addr->a.v4.sin_port = htons(bp->port);
183 
184         addr->state = addr_state;
185         addr->valid = 1;
186 
187         INIT_LIST_HEAD(&addr->list);
188 
189         /* We always hold a socket lock when calling this function,
190          * and that acts as a writer synchronizing lock.
191          */
192         list_add_tail_rcu(&addr->list, &bp->address_list);
193         SCTP_DBG_OBJCNT_INC(addr);
194 
195         return 0;
196 }
197 
198 /* Delete an address from the bind address list in the SCTP_bind_addr
199  * structure.
200  */
201 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
202 {
203         struct sctp_sockaddr_entry *addr, *temp;
204         int found = 0;
205 
206         /* We hold the socket lock when calling this function,
207          * and that acts as a writer synchronizing lock.
208          */
209         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
210                 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
211                         /* Found the exact match. */
212                         found = 1;
213                         addr->valid = 0;
214                         list_del_rcu(&addr->list);
215                         break;
216                 }
217         }
218 
219         if (found) {
220                 kfree_rcu(addr, rcu);
221                 SCTP_DBG_OBJCNT_DEC(addr);
222                 return 0;
223         }
224 
225         return -EINVAL;
226 }
227 
228 /* Create a network byte-order representation of all the addresses
229  * formated as SCTP parameters.
230  *
231  * The second argument is the return value for the length.
232  */
233 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
234                                          int *addrs_len,
235                                          gfp_t gfp)
236 {
237         union sctp_params addrparms;
238         union sctp_params retval;
239         int addrparms_len;
240         union sctp_addr_param rawaddr;
241         int len;
242         struct sctp_sockaddr_entry *addr;
243         struct list_head *pos;
244         struct sctp_af *af;
245 
246         addrparms_len = 0;
247         len = 0;
248 
249         /* Allocate enough memory at once. */
250         list_for_each(pos, &bp->address_list) {
251                 len += sizeof(union sctp_addr_param);
252         }
253 
254         /* Don't even bother embedding an address if there
255          * is only one.
256          */
257         if (len == sizeof(union sctp_addr_param)) {
258                 retval.v = NULL;
259                 goto end_raw;
260         }
261 
262         retval.v = kmalloc(len, gfp);
263         if (!retval.v)
264                 goto end_raw;
265 
266         addrparms = retval;
267 
268         list_for_each_entry(addr, &bp->address_list, list) {
269                 af = sctp_get_af_specific(addr->a.v4.sin_family);
270                 len = af->to_addr_param(&addr->a, &rawaddr);
271                 memcpy(addrparms.v, &rawaddr, len);
272                 addrparms.v += len;
273                 addrparms_len += len;
274         }
275 
276 end_raw:
277         *addrs_len = addrparms_len;
278         return retval;
279 }
280 
281 /*
282  * Create an address list out of the raw address list format (IPv4 and IPv6
283  * address parameters).
284  */
285 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
286                            int addrs_len, __u16 port, gfp_t gfp)
287 {
288         union sctp_addr_param *rawaddr;
289         struct sctp_paramhdr *param;
290         union sctp_addr addr;
291         int retval = 0;
292         int len;
293         struct sctp_af *af;
294 
295         /* Convert the raw address to standard address format */
296         while (addrs_len) {
297                 param = (struct sctp_paramhdr *)raw_addr_list;
298                 rawaddr = (union sctp_addr_param *)raw_addr_list;
299 
300                 af = sctp_get_af_specific(param_type2af(param->type));
301                 if (unlikely(!af)) {
302                         retval = -EINVAL;
303                         sctp_bind_addr_clean(bp);
304                         break;
305                 }
306 
307                 af->from_addr_param(&addr, rawaddr, htons(port), 0);
308                 retval = sctp_add_bind_addr(bp, &addr, SCTP_ADDR_SRC, gfp);
309                 if (retval) {
310                         /* Can't finish building the list, clean up. */
311                         sctp_bind_addr_clean(bp);
312                         break;
313                 }
314 
315                 len = ntohs(param->length);
316                 addrs_len -= len;
317                 raw_addr_list += len;
318         }
319 
320         return retval;
321 }
322 
323 /********************************************************************
324  * 2nd Level Abstractions
325  ********************************************************************/
326 
327 /* Does this contain a specified address?  Allow wildcarding. */
328 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
329                          const union sctp_addr *addr,
330                          struct sctp_sock *opt)
331 {
332         struct sctp_sockaddr_entry *laddr;
333         int match = 0;
334 
335         rcu_read_lock();
336         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
337                 if (!laddr->valid)
338                         continue;
339                 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
340                         match = 1;
341                         break;
342                 }
343         }
344         rcu_read_unlock();
345 
346         return match;
347 }
348 
349 /* Does the address 'addr' conflict with any addresses in
350  * the bp.
351  */
352 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
353                             const union sctp_addr *addr,
354                             struct sctp_sock *bp_sp,
355                             struct sctp_sock *addr_sp)
356 {
357         struct sctp_sockaddr_entry *laddr;
358         int conflict = 0;
359         struct sctp_sock *sp;
360 
361         /* Pick the IPv6 socket as the basis of comparison
362          * since it's usually a superset of the IPv4.
363          * If there is no IPv6 socket, then default to bind_addr.
364          */
365         if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
366                 sp = bp_sp;
367         else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
368                 sp = addr_sp;
369         else
370                 sp = bp_sp;
371 
372         rcu_read_lock();
373         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
374                 if (!laddr->valid)
375                         continue;
376 
377                 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
378                 if (conflict)
379                         break;
380         }
381         rcu_read_unlock();
382 
383         return conflict;
384 }
385 
386 /* Get the state of the entry in the bind_addr_list */
387 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
388                          const union sctp_addr *addr)
389 {
390         struct sctp_sockaddr_entry *laddr;
391         struct sctp_af *af;
392         int state = -1;
393 
394         af = sctp_get_af_specific(addr->sa.sa_family);
395         if (unlikely(!af))
396                 return state;
397 
398         rcu_read_lock();
399         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
400                 if (!laddr->valid)
401                         continue;
402                 if (af->cmp_addr(&laddr->a, addr)) {
403                         state = laddr->state;
404                         break;
405                 }
406         }
407         rcu_read_unlock();
408 
409         return state;
410 }
411 
412 /* Find the first address in the bind address list that is not present in
413  * the addrs packed array.
414  */
415 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
416                                         const union sctp_addr   *addrs,
417                                         int                     addrcnt,
418                                         struct sctp_sock        *opt)
419 {
420         struct sctp_sockaddr_entry      *laddr;
421         union sctp_addr                 *addr;
422         void                            *addr_buf;
423         struct sctp_af                  *af;
424         int                             i;
425 
426         /* This is only called sctp_send_asconf_del_ip() and we hold
427          * the socket lock in that code patch, so that address list
428          * can't change.
429          */
430         list_for_each_entry(laddr, &bp->address_list, list) {
431                 addr_buf = (union sctp_addr *)addrs;
432                 for (i = 0; i < addrcnt; i++) {
433                         addr = (union sctp_addr *)addr_buf;
434                         af = sctp_get_af_specific(addr->v4.sin_family);
435                         if (!af)
436                                 break;
437 
438                         if (opt->pf->cmp_addr(&laddr->a, addr, opt))
439                                 break;
440 
441                         addr_buf += af->sockaddr_len;
442                 }
443                 if (i == addrcnt)
444                         return &laddr->a;
445         }
446 
447         return NULL;
448 }
449 
450 /* Copy out addresses from the global local address list. */
451 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
452                               union sctp_addr *addr,
453                               sctp_scope_t scope, gfp_t gfp,
454                               int flags)
455 {
456         int error = 0;
457 
458         if (sctp_is_any(NULL, addr)) {
459                 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
460         } else if (sctp_in_scope(addr, scope)) {
461                 /* Now that the address is in scope, check to see if
462                  * the address type is supported by local sock as
463                  * well as the remote peer.
464                  */
465                 if ((((AF_INET == addr->sa.sa_family) &&
466                       (flags & SCTP_ADDR4_PEERSUPP))) ||
467                     (((AF_INET6 == addr->sa.sa_family) &&
468                       (flags & SCTP_ADDR6_ALLOWED) &&
469                       (flags & SCTP_ADDR6_PEERSUPP))))
470                         error = sctp_add_bind_addr(dest, addr, SCTP_ADDR_SRC,
471                                                     gfp);
472         }
473 
474         return error;
475 }
476 
477 /* Is this a wildcard address?  */
478 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
479 {
480         unsigned short fam = 0;
481         struct sctp_af *af;
482 
483         /* Try to get the right address family */
484         if (addr->sa.sa_family != AF_UNSPEC)
485                 fam = addr->sa.sa_family;
486         else if (sk)
487                 fam = sk->sk_family;
488 
489         af = sctp_get_af_specific(fam);
490         if (!af)
491                 return 0;
492 
493         return af->is_any(addr);
494 }
495 
496 /* Is 'addr' valid for 'scope'?  */
497 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
498 {
499         sctp_scope_t addr_scope = sctp_scope(addr);
500 
501         /* The unusable SCTP addresses will not be considered with
502          * any defined scopes.
503          */
504         if (SCTP_SCOPE_UNUSABLE == addr_scope)
505                 return 0;
506         /*
507          * For INIT and INIT-ACK address list, let L be the level of
508          * of requested destination address, sender and receiver
509          * SHOULD include all of its addresses with level greater
510          * than or equal to L.
511          *
512          * Address scoping can be selectively controlled via sysctl
513          * option
514          */
515         switch (sctp_scope_policy) {
516         case SCTP_SCOPE_POLICY_DISABLE:
517                 return 1;
518         case SCTP_SCOPE_POLICY_ENABLE:
519                 if (addr_scope <= scope)
520                         return 1;
521                 break;
522         case SCTP_SCOPE_POLICY_PRIVATE:
523                 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
524                         return 1;
525                 break;
526         case SCTP_SCOPE_POLICY_LINK:
527                 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
528                         return 1;
529                 break;
530         default:
531                 break;
532         }
533 
534         return 0;
535 }
536 
537 /********************************************************************
538  * 3rd Level Abstractions
539  ********************************************************************/
540 
541 /* What is the scope of 'addr'?  */
542 sctp_scope_t sctp_scope(const union sctp_addr *addr)
543 {
544         struct sctp_af *af;
545 
546         af = sctp_get_af_specific(addr->sa.sa_family);
547         if (!af)
548                 return SCTP_SCOPE_UNUSABLE;
549 
550         return af->scope((union sctp_addr *)addr);
551 }
552 

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