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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, see
 25  * <http://www.gnu.org/licenses/>.
 26  *
 27  * Please send any bug reports or fixes you make to the
 28  * email address(es):
 29  *    lksctp developers <linux-sctp@vger.kernel.org>
 30  *
 31  * Written or modified by:
 32  *    La Monte H.P. Yarroll <piggy@acm.org>
 33  *    Karl Knutson          <karl@athena.chicago.il.us>
 34  *    Jon Grimm             <jgrimm@us.ibm.com>
 35  *    Daisy Chang           <daisyc@us.ibm.com>
 36  */
 37 
 38 #include <linux/types.h>
 39 #include <linux/slab.h>
 40 #include <linux/in.h>
 41 #include <net/sock.h>
 42 #include <net/ipv6.h>
 43 #include <net/if_inet6.h>
 44 #include <net/sctp/sctp.h>
 45 #include <net/sctp/sm.h>
 46 
 47 /* Forward declarations for internal helpers. */
 48 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
 49                               union sctp_addr *addr, enum sctp_scope scope,
 50                               gfp_t gfp, int flags);
 51 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
 52 
 53 /* First Level Abstractions. */
 54 
 55 /* Copy 'src' to 'dest' taking 'scope' into account.  Omit addresses
 56  * in 'src' which have a broader scope than 'scope'.
 57  */
 58 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
 59                         const struct sctp_bind_addr *src,
 60                         enum sctp_scope scope, gfp_t gfp,
 61                         int flags)
 62 {
 63         struct sctp_sockaddr_entry *addr;
 64         int error = 0;
 65 
 66         /* All addresses share the same port.  */
 67         dest->port = src->port;
 68 
 69         /* Extract the addresses which are relevant for this scope.  */
 70         list_for_each_entry(addr, &src->address_list, list) {
 71                 error = sctp_copy_one_addr(net, dest, &addr->a, scope,
 72                                            gfp, flags);
 73                 if (error < 0)
 74                         goto out;
 75         }
 76 
 77         /* If there are no addresses matching the scope and
 78          * this is global scope, try to get a link scope address, with
 79          * the assumption that we must be sitting behind a NAT.
 80          */
 81         if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
 82                 list_for_each_entry(addr, &src->address_list, list) {
 83                         error = sctp_copy_one_addr(net, dest, &addr->a,
 84                                                    SCTP_SCOPE_LINK, gfp,
 85                                                    flags);
 86                         if (error < 0)
 87                                 goto out;
 88                 }
 89         }
 90 
 91 out:
 92         if (error)
 93                 sctp_bind_addr_clean(dest);
 94 
 95         return error;
 96 }
 97 
 98 /* Exactly duplicate the address lists.  This is necessary when doing
 99  * peer-offs and accepts.  We don't want to put all the current system
100  * addresses into the endpoint.  That's useless.  But we do want duplicat
101  * the list of bound addresses that the older endpoint used.
102  */
103 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
104                         const struct sctp_bind_addr *src,
105                         gfp_t gfp)
106 {
107         struct sctp_sockaddr_entry *addr;
108         int error = 0;
109 
110         /* All addresses share the same port.  */
111         dest->port = src->port;
112 
113         list_for_each_entry(addr, &src->address_list, list) {
114                 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
115                                            1, gfp);
116                 if (error < 0)
117                         break;
118         }
119 
120         return error;
121 }
122 
123 /* Initialize the SCTP_bind_addr structure for either an endpoint or
124  * an association.
125  */
126 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
127 {
128         INIT_LIST_HEAD(&bp->address_list);
129         bp->port = port;
130 }
131 
132 /* Dispose of the address list. */
133 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
134 {
135         struct sctp_sockaddr_entry *addr, *temp;
136 
137         /* Empty the bind address list. */
138         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
139                 list_del_rcu(&addr->list);
140                 kfree_rcu(addr, rcu);
141                 SCTP_DBG_OBJCNT_DEC(addr);
142         }
143 }
144 
145 /* Dispose of an SCTP_bind_addr structure  */
146 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
147 {
148         /* Empty the bind address list. */
149         sctp_bind_addr_clean(bp);
150 }
151 
152 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
153 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
154                        int new_size, __u8 addr_state, gfp_t gfp)
155 {
156         struct sctp_sockaddr_entry *addr;
157 
158         /* Add the address to the bind address list.  */
159         addr = kzalloc(sizeof(*addr), gfp);
160         if (!addr)
161                 return -ENOMEM;
162 
163         memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
164 
165         /* Fix up the port if it has not yet been set.
166          * Both v4 and v6 have the port at the same offset.
167          */
168         if (!addr->a.v4.sin_port)
169                 addr->a.v4.sin_port = htons(bp->port);
170 
171         addr->state = addr_state;
172         addr->valid = 1;
173 
174         INIT_LIST_HEAD(&addr->list);
175 
176         /* We always hold a socket lock when calling this function,
177          * and that acts as a writer synchronizing lock.
178          */
179         list_add_tail_rcu(&addr->list, &bp->address_list);
180         SCTP_DBG_OBJCNT_INC(addr);
181 
182         return 0;
183 }
184 
185 /* Delete an address from the bind address list in the SCTP_bind_addr
186  * structure.
187  */
188 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
189 {
190         struct sctp_sockaddr_entry *addr, *temp;
191         int found = 0;
192 
193         /* We hold the socket lock when calling this function,
194          * and that acts as a writer synchronizing lock.
195          */
196         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
197                 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
198                         /* Found the exact match. */
199                         found = 1;
200                         addr->valid = 0;
201                         list_del_rcu(&addr->list);
202                         break;
203                 }
204         }
205 
206         if (found) {
207                 kfree_rcu(addr, rcu);
208                 SCTP_DBG_OBJCNT_DEC(addr);
209                 return 0;
210         }
211 
212         return -EINVAL;
213 }
214 
215 /* Create a network byte-order representation of all the addresses
216  * formated as SCTP parameters.
217  *
218  * The second argument is the return value for the length.
219  */
220 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
221                                          int *addrs_len,
222                                          gfp_t gfp)
223 {
224         union sctp_params addrparms;
225         union sctp_params retval;
226         int addrparms_len;
227         union sctp_addr_param rawaddr;
228         int len;
229         struct sctp_sockaddr_entry *addr;
230         struct list_head *pos;
231         struct sctp_af *af;
232 
233         addrparms_len = 0;
234         len = 0;
235 
236         /* Allocate enough memory at once. */
237         list_for_each(pos, &bp->address_list) {
238                 len += sizeof(union sctp_addr_param);
239         }
240 
241         /* Don't even bother embedding an address if there
242          * is only one.
243          */
244         if (len == sizeof(union sctp_addr_param)) {
245                 retval.v = NULL;
246                 goto end_raw;
247         }
248 
249         retval.v = kmalloc(len, gfp);
250         if (!retval.v)
251                 goto end_raw;
252 
253         addrparms = retval;
254 
255         list_for_each_entry(addr, &bp->address_list, list) {
256                 af = sctp_get_af_specific(addr->a.v4.sin_family);
257                 len = af->to_addr_param(&addr->a, &rawaddr);
258                 memcpy(addrparms.v, &rawaddr, len);
259                 addrparms.v += len;
260                 addrparms_len += len;
261         }
262 
263 end_raw:
264         *addrs_len = addrparms_len;
265         return retval;
266 }
267 
268 /*
269  * Create an address list out of the raw address list format (IPv4 and IPv6
270  * address parameters).
271  */
272 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
273                            int addrs_len, __u16 port, gfp_t gfp)
274 {
275         union sctp_addr_param *rawaddr;
276         struct sctp_paramhdr *param;
277         union sctp_addr addr;
278         int retval = 0;
279         int len;
280         struct sctp_af *af;
281 
282         /* Convert the raw address to standard address format */
283         while (addrs_len) {
284                 param = (struct sctp_paramhdr *)raw_addr_list;
285                 rawaddr = (union sctp_addr_param *)raw_addr_list;
286 
287                 af = sctp_get_af_specific(param_type2af(param->type));
288                 if (unlikely(!af)) {
289                         retval = -EINVAL;
290                         sctp_bind_addr_clean(bp);
291                         break;
292                 }
293 
294                 af->from_addr_param(&addr, rawaddr, htons(port), 0);
295                 if (sctp_bind_addr_state(bp, &addr) != -1)
296                         goto next;
297                 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
298                                             SCTP_ADDR_SRC, gfp);
299                 if (retval) {
300                         /* Can't finish building the list, clean up. */
301                         sctp_bind_addr_clean(bp);
302                         break;
303                 }
304 
305 next:
306                 len = ntohs(param->length);
307                 addrs_len -= len;
308                 raw_addr_list += len;
309         }
310 
311         return retval;
312 }
313 
314 /********************************************************************
315  * 2nd Level Abstractions
316  ********************************************************************/
317 
318 /* Does this contain a specified address?  Allow wildcarding. */
319 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
320                          const union sctp_addr *addr,
321                          struct sctp_sock *opt)
322 {
323         struct sctp_sockaddr_entry *laddr;
324         int match = 0;
325 
326         rcu_read_lock();
327         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
328                 if (!laddr->valid)
329                         continue;
330                 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
331                         match = 1;
332                         break;
333                 }
334         }
335         rcu_read_unlock();
336 
337         return match;
338 }
339 
340 /* Does the address 'addr' conflict with any addresses in
341  * the bp.
342  */
343 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
344                             const union sctp_addr *addr,
345                             struct sctp_sock *bp_sp,
346                             struct sctp_sock *addr_sp)
347 {
348         struct sctp_sockaddr_entry *laddr;
349         int conflict = 0;
350         struct sctp_sock *sp;
351 
352         /* Pick the IPv6 socket as the basis of comparison
353          * since it's usually a superset of the IPv4.
354          * If there is no IPv6 socket, then default to bind_addr.
355          */
356         if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
357                 sp = bp_sp;
358         else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
359                 sp = addr_sp;
360         else
361                 sp = bp_sp;
362 
363         rcu_read_lock();
364         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
365                 if (!laddr->valid)
366                         continue;
367 
368                 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
369                 if (conflict)
370                         break;
371         }
372         rcu_read_unlock();
373 
374         return conflict;
375 }
376 
377 /* Get the state of the entry in the bind_addr_list */
378 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
379                          const union sctp_addr *addr)
380 {
381         struct sctp_sockaddr_entry *laddr;
382         struct sctp_af *af;
383         int state = -1;
384 
385         af = sctp_get_af_specific(addr->sa.sa_family);
386         if (unlikely(!af))
387                 return state;
388 
389         rcu_read_lock();
390         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
391                 if (!laddr->valid)
392                         continue;
393                 if (af->cmp_addr(&laddr->a, addr)) {
394                         state = laddr->state;
395                         break;
396                 }
397         }
398         rcu_read_unlock();
399 
400         return state;
401 }
402 
403 /* Find the first address in the bind address list that is not present in
404  * the addrs packed array.
405  */
406 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
407                                         const union sctp_addr   *addrs,
408                                         int                     addrcnt,
409                                         struct sctp_sock        *opt)
410 {
411         struct sctp_sockaddr_entry      *laddr;
412         union sctp_addr                 *addr;
413         void                            *addr_buf;
414         struct sctp_af                  *af;
415         int                             i;
416 
417         /* This is only called sctp_send_asconf_del_ip() and we hold
418          * the socket lock in that code patch, so that address list
419          * can't change.
420          */
421         list_for_each_entry(laddr, &bp->address_list, list) {
422                 addr_buf = (union sctp_addr *)addrs;
423                 for (i = 0; i < addrcnt; i++) {
424                         addr = addr_buf;
425                         af = sctp_get_af_specific(addr->v4.sin_family);
426                         if (!af)
427                                 break;
428 
429                         if (opt->pf->cmp_addr(&laddr->a, addr, opt))
430                                 break;
431 
432                         addr_buf += af->sockaddr_len;
433                 }
434                 if (i == addrcnt)
435                         return &laddr->a;
436         }
437 
438         return NULL;
439 }
440 
441 /* Copy out addresses from the global local address list. */
442 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
443                               union sctp_addr *addr, enum sctp_scope scope,
444                               gfp_t gfp, int flags)
445 {
446         int error = 0;
447 
448         if (sctp_is_any(NULL, addr)) {
449                 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
450         } else if (sctp_in_scope(net, addr, scope)) {
451                 /* Now that the address is in scope, check to see if
452                  * the address type is supported by local sock as
453                  * well as the remote peer.
454                  */
455                 if ((((AF_INET == addr->sa.sa_family) &&
456                       (flags & SCTP_ADDR4_PEERSUPP))) ||
457                     (((AF_INET6 == addr->sa.sa_family) &&
458                       (flags & SCTP_ADDR6_ALLOWED) &&
459                       (flags & SCTP_ADDR6_PEERSUPP))))
460                         error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
461                                                    SCTP_ADDR_SRC, gfp);
462         }
463 
464         return error;
465 }
466 
467 /* Is this a wildcard address?  */
468 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
469 {
470         unsigned short fam = 0;
471         struct sctp_af *af;
472 
473         /* Try to get the right address family */
474         if (addr->sa.sa_family != AF_UNSPEC)
475                 fam = addr->sa.sa_family;
476         else if (sk)
477                 fam = sk->sk_family;
478 
479         af = sctp_get_af_specific(fam);
480         if (!af)
481                 return 0;
482 
483         return af->is_any(addr);
484 }
485 
486 /* Is 'addr' valid for 'scope'?  */
487 int sctp_in_scope(struct net *net, const union sctp_addr *addr,
488                   enum sctp_scope scope)
489 {
490         enum sctp_scope addr_scope = sctp_scope(addr);
491 
492         /* The unusable SCTP addresses will not be considered with
493          * any defined scopes.
494          */
495         if (SCTP_SCOPE_UNUSABLE == addr_scope)
496                 return 0;
497         /*
498          * For INIT and INIT-ACK address list, let L be the level of
499          * of requested destination address, sender and receiver
500          * SHOULD include all of its addresses with level greater
501          * than or equal to L.
502          *
503          * Address scoping can be selectively controlled via sysctl
504          * option
505          */
506         switch (net->sctp.scope_policy) {
507         case SCTP_SCOPE_POLICY_DISABLE:
508                 return 1;
509         case SCTP_SCOPE_POLICY_ENABLE:
510                 if (addr_scope <= scope)
511                         return 1;
512                 break;
513         case SCTP_SCOPE_POLICY_PRIVATE:
514                 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
515                         return 1;
516                 break;
517         case SCTP_SCOPE_POLICY_LINK:
518                 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
519                         return 1;
520                 break;
521         default:
522                 break;
523         }
524 
525         return 0;
526 }
527 
528 int sctp_is_ep_boundall(struct sock *sk)
529 {
530         struct sctp_bind_addr *bp;
531         struct sctp_sockaddr_entry *addr;
532 
533         bp = &sctp_sk(sk)->ep->base.bind_addr;
534         if (sctp_list_single_entry(&bp->address_list)) {
535                 addr = list_entry(bp->address_list.next,
536                                   struct sctp_sockaddr_entry, list);
537                 if (sctp_is_any(sk, &addr->a))
538                         return 1;
539         }
540         return 0;
541 }
542 
543 /********************************************************************
544  * 3rd Level Abstractions
545  ********************************************************************/
546 
547 /* What is the scope of 'addr'?  */
548 enum sctp_scope sctp_scope(const union sctp_addr *addr)
549 {
550         struct sctp_af *af;
551 
552         af = sctp_get_af_specific(addr->sa.sa_family);
553         if (!af)
554                 return SCTP_SCOPE_UNUSABLE;
555 
556         return af->scope((union sctp_addr *)addr);
557 }
558 

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