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Linux/net/sctp/bind_addr.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* SCTP kernel implementation
  3  * (C) Copyright IBM Corp. 2001, 2003
  4  * Copyright (c) Cisco 1999,2000
  5  * Copyright (c) Motorola 1999,2000,2001
  6  * Copyright (c) La Monte H.P. Yarroll 2001
  7  *
  8  * This file is part of the SCTP kernel implementation.
  9  *
 10  * A collection class to handle the storage of transport addresses.
 11  *
 12  * Please send any bug reports or fixes you make to the
 13  * email address(es):
 14  *    lksctp developers <linux-sctp@vger.kernel.org>
 15  *
 16  * Written or modified by:
 17  *    La Monte H.P. Yarroll <piggy@acm.org>
 18  *    Karl Knutson          <karl@athena.chicago.il.us>
 19  *    Jon Grimm             <jgrimm@us.ibm.com>
 20  *    Daisy Chang           <daisyc@us.ibm.com>
 21  */
 22 
 23 #include <linux/types.h>
 24 #include <linux/slab.h>
 25 #include <linux/in.h>
 26 #include <net/sock.h>
 27 #include <net/ipv6.h>
 28 #include <net/if_inet6.h>
 29 #include <net/sctp/sctp.h>
 30 #include <net/sctp/sm.h>
 31 
 32 /* Forward declarations for internal helpers. */
 33 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
 34                               union sctp_addr *addr, enum sctp_scope scope,
 35                               gfp_t gfp, int flags);
 36 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
 37 
 38 /* First Level Abstractions. */
 39 
 40 /* Copy 'src' to 'dest' taking 'scope' into account.  Omit addresses
 41  * in 'src' which have a broader scope than 'scope'.
 42  */
 43 int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest,
 44                         const struct sctp_bind_addr *src,
 45                         enum sctp_scope scope, gfp_t gfp,
 46                         int flags)
 47 {
 48         struct sctp_sockaddr_entry *addr;
 49         int error = 0;
 50 
 51         /* All addresses share the same port.  */
 52         dest->port = src->port;
 53 
 54         /* Extract the addresses which are relevant for this scope.  */
 55         list_for_each_entry(addr, &src->address_list, list) {
 56                 error = sctp_copy_one_addr(net, dest, &addr->a, scope,
 57                                            gfp, flags);
 58                 if (error < 0)
 59                         goto out;
 60         }
 61 
 62         /* If there are no addresses matching the scope and
 63          * this is global scope, try to get a link scope address, with
 64          * the assumption that we must be sitting behind a NAT.
 65          */
 66         if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
 67                 list_for_each_entry(addr, &src->address_list, list) {
 68                         error = sctp_copy_one_addr(net, dest, &addr->a,
 69                                                    SCTP_SCOPE_LINK, gfp,
 70                                                    flags);
 71                         if (error < 0)
 72                                 goto out;
 73                 }
 74         }
 75 
 76 out:
 77         if (error)
 78                 sctp_bind_addr_clean(dest);
 79 
 80         return error;
 81 }
 82 
 83 /* Exactly duplicate the address lists.  This is necessary when doing
 84  * peer-offs and accepts.  We don't want to put all the current system
 85  * addresses into the endpoint.  That's useless.  But we do want duplicat
 86  * the list of bound addresses that the older endpoint used.
 87  */
 88 int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
 89                         const struct sctp_bind_addr *src,
 90                         gfp_t gfp)
 91 {
 92         struct sctp_sockaddr_entry *addr;
 93         int error = 0;
 94 
 95         /* All addresses share the same port.  */
 96         dest->port = src->port;
 97 
 98         list_for_each_entry(addr, &src->address_list, list) {
 99                 error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a),
100                                            1, gfp);
101                 if (error < 0)
102                         break;
103         }
104 
105         return error;
106 }
107 
108 /* Initialize the SCTP_bind_addr structure for either an endpoint or
109  * an association.
110  */
111 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
112 {
113         INIT_LIST_HEAD(&bp->address_list);
114         bp->port = port;
115 }
116 
117 /* Dispose of the address list. */
118 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
119 {
120         struct sctp_sockaddr_entry *addr, *temp;
121 
122         /* Empty the bind address list. */
123         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
124                 list_del_rcu(&addr->list);
125                 kfree_rcu(addr, rcu);
126                 SCTP_DBG_OBJCNT_DEC(addr);
127         }
128 }
129 
130 /* Dispose of an SCTP_bind_addr structure  */
131 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
132 {
133         /* Empty the bind address list. */
134         sctp_bind_addr_clean(bp);
135 }
136 
137 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
138 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
139                        int new_size, __u8 addr_state, gfp_t gfp)
140 {
141         struct sctp_sockaddr_entry *addr;
142 
143         /* Add the address to the bind address list.  */
144         addr = kzalloc(sizeof(*addr), gfp);
145         if (!addr)
146                 return -ENOMEM;
147 
148         memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size));
149 
150         /* Fix up the port if it has not yet been set.
151          * Both v4 and v6 have the port at the same offset.
152          */
153         if (!addr->a.v4.sin_port)
154                 addr->a.v4.sin_port = htons(bp->port);
155 
156         addr->state = addr_state;
157         addr->valid = 1;
158 
159         INIT_LIST_HEAD(&addr->list);
160 
161         /* We always hold a socket lock when calling this function,
162          * and that acts as a writer synchronizing lock.
163          */
164         list_add_tail_rcu(&addr->list, &bp->address_list);
165         SCTP_DBG_OBJCNT_INC(addr);
166 
167         return 0;
168 }
169 
170 /* Delete an address from the bind address list in the SCTP_bind_addr
171  * structure.
172  */
173 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
174 {
175         struct sctp_sockaddr_entry *addr, *temp;
176         int found = 0;
177 
178         /* We hold the socket lock when calling this function,
179          * and that acts as a writer synchronizing lock.
180          */
181         list_for_each_entry_safe(addr, temp, &bp->address_list, list) {
182                 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
183                         /* Found the exact match. */
184                         found = 1;
185                         addr->valid = 0;
186                         list_del_rcu(&addr->list);
187                         break;
188                 }
189         }
190 
191         if (found) {
192                 kfree_rcu(addr, rcu);
193                 SCTP_DBG_OBJCNT_DEC(addr);
194                 return 0;
195         }
196 
197         return -EINVAL;
198 }
199 
200 /* Create a network byte-order representation of all the addresses
201  * formated as SCTP parameters.
202  *
203  * The second argument is the return value for the length.
204  */
205 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
206                                          int *addrs_len,
207                                          gfp_t gfp)
208 {
209         union sctp_params addrparms;
210         union sctp_params retval;
211         int addrparms_len;
212         union sctp_addr_param rawaddr;
213         int len;
214         struct sctp_sockaddr_entry *addr;
215         struct list_head *pos;
216         struct sctp_af *af;
217 
218         addrparms_len = 0;
219         len = 0;
220 
221         /* Allocate enough memory at once. */
222         list_for_each(pos, &bp->address_list) {
223                 len += sizeof(union sctp_addr_param);
224         }
225 
226         /* Don't even bother embedding an address if there
227          * is only one.
228          */
229         if (len == sizeof(union sctp_addr_param)) {
230                 retval.v = NULL;
231                 goto end_raw;
232         }
233 
234         retval.v = kmalloc(len, gfp);
235         if (!retval.v)
236                 goto end_raw;
237 
238         addrparms = retval;
239 
240         list_for_each_entry(addr, &bp->address_list, list) {
241                 af = sctp_get_af_specific(addr->a.v4.sin_family);
242                 len = af->to_addr_param(&addr->a, &rawaddr);
243                 memcpy(addrparms.v, &rawaddr, len);
244                 addrparms.v += len;
245                 addrparms_len += len;
246         }
247 
248 end_raw:
249         *addrs_len = addrparms_len;
250         return retval;
251 }
252 
253 /*
254  * Create an address list out of the raw address list format (IPv4 and IPv6
255  * address parameters).
256  */
257 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
258                            int addrs_len, __u16 port, gfp_t gfp)
259 {
260         union sctp_addr_param *rawaddr;
261         struct sctp_paramhdr *param;
262         union sctp_addr addr;
263         int retval = 0;
264         int len;
265         struct sctp_af *af;
266 
267         /* Convert the raw address to standard address format */
268         while (addrs_len) {
269                 param = (struct sctp_paramhdr *)raw_addr_list;
270                 rawaddr = (union sctp_addr_param *)raw_addr_list;
271 
272                 af = sctp_get_af_specific(param_type2af(param->type));
273                 if (unlikely(!af)) {
274                         retval = -EINVAL;
275                         sctp_bind_addr_clean(bp);
276                         break;
277                 }
278 
279                 af->from_addr_param(&addr, rawaddr, htons(port), 0);
280                 if (sctp_bind_addr_state(bp, &addr) != -1)
281                         goto next;
282                 retval = sctp_add_bind_addr(bp, &addr, sizeof(addr),
283                                             SCTP_ADDR_SRC, gfp);
284                 if (retval) {
285                         /* Can't finish building the list, clean up. */
286                         sctp_bind_addr_clean(bp);
287                         break;
288                 }
289 
290 next:
291                 len = ntohs(param->length);
292                 addrs_len -= len;
293                 raw_addr_list += len;
294         }
295 
296         return retval;
297 }
298 
299 /********************************************************************
300  * 2nd Level Abstractions
301  ********************************************************************/
302 
303 /* Does this contain a specified address?  Allow wildcarding. */
304 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
305                          const union sctp_addr *addr,
306                          struct sctp_sock *opt)
307 {
308         struct sctp_sockaddr_entry *laddr;
309         int match = 0;
310 
311         rcu_read_lock();
312         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
313                 if (!laddr->valid)
314                         continue;
315                 if (opt->pf->cmp_addr(&laddr->a, addr, opt)) {
316                         match = 1;
317                         break;
318                 }
319         }
320         rcu_read_unlock();
321 
322         return match;
323 }
324 
325 int sctp_bind_addrs_check(struct sctp_sock *sp,
326                           struct sctp_sock *sp2, int cnt2)
327 {
328         struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr;
329         struct sctp_bind_addr *bp = &sp->ep->base.bind_addr;
330         struct sctp_sockaddr_entry *laddr, *laddr2;
331         bool exist = false;
332         int cnt = 0;
333 
334         rcu_read_lock();
335         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
336                 list_for_each_entry_rcu(laddr2, &bp2->address_list, list) {
337                         if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) &&
338                             laddr->valid && laddr2->valid) {
339                                 exist = true;
340                                 goto next;
341                         }
342                 }
343                 cnt = 0;
344                 break;
345 next:
346                 cnt++;
347         }
348         rcu_read_unlock();
349 
350         return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1);
351 }
352 
353 /* Does the address 'addr' conflict with any addresses in
354  * the bp.
355  */
356 int sctp_bind_addr_conflict(struct sctp_bind_addr *bp,
357                             const union sctp_addr *addr,
358                             struct sctp_sock *bp_sp,
359                             struct sctp_sock *addr_sp)
360 {
361         struct sctp_sockaddr_entry *laddr;
362         int conflict = 0;
363         struct sctp_sock *sp;
364 
365         /* Pick the IPv6 socket as the basis of comparison
366          * since it's usually a superset of the IPv4.
367          * If there is no IPv6 socket, then default to bind_addr.
368          */
369         if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6)
370                 sp = bp_sp;
371         else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6)
372                 sp = addr_sp;
373         else
374                 sp = bp_sp;
375 
376         rcu_read_lock();
377         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
378                 if (!laddr->valid)
379                         continue;
380 
381                 conflict = sp->pf->cmp_addr(&laddr->a, addr, sp);
382                 if (conflict)
383                         break;
384         }
385         rcu_read_unlock();
386 
387         return conflict;
388 }
389 
390 /* Get the state of the entry in the bind_addr_list */
391 int sctp_bind_addr_state(const struct sctp_bind_addr *bp,
392                          const union sctp_addr *addr)
393 {
394         struct sctp_sockaddr_entry *laddr;
395         struct sctp_af *af;
396 
397         af = sctp_get_af_specific(addr->sa.sa_family);
398         if (unlikely(!af))
399                 return -1;
400 
401         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
402                 if (!laddr->valid)
403                         continue;
404                 if (af->cmp_addr(&laddr->a, addr))
405                         return laddr->state;
406         }
407 
408         return -1;
409 }
410 
411 /* Find the first address in the bind address list that is not present in
412  * the addrs packed array.
413  */
414 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr   *bp,
415                                         const union sctp_addr   *addrs,
416                                         int                     addrcnt,
417                                         struct sctp_sock        *opt)
418 {
419         struct sctp_sockaddr_entry      *laddr;
420         union sctp_addr                 *addr;
421         void                            *addr_buf;
422         struct sctp_af                  *af;
423         int                             i;
424 
425         /* This is only called sctp_send_asconf_del_ip() and we hold
426          * the socket lock in that code patch, so that address list
427          * can't change.
428          */
429         list_for_each_entry(laddr, &bp->address_list, list) {
430                 addr_buf = (union sctp_addr *)addrs;
431                 for (i = 0; i < addrcnt; i++) {
432                         addr = addr_buf;
433                         af = sctp_get_af_specific(addr->v4.sin_family);
434                         if (!af)
435                                 break;
436 
437                         if (opt->pf->cmp_addr(&laddr->a, addr, opt))
438                                 break;
439 
440                         addr_buf += af->sockaddr_len;
441                 }
442                 if (i == addrcnt)
443                         return &laddr->a;
444         }
445 
446         return NULL;
447 }
448 
449 /* Copy out addresses from the global local address list. */
450 static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
451                               union sctp_addr *addr, enum sctp_scope scope,
452                               gfp_t gfp, int flags)
453 {
454         int error = 0;
455 
456         if (sctp_is_any(NULL, addr)) {
457                 error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags);
458         } else if (sctp_in_scope(net, addr, scope)) {
459                 /* Now that the address is in scope, check to see if
460                  * the address type is supported by local sock as
461                  * well as the remote peer.
462                  */
463                 if ((((AF_INET == addr->sa.sa_family) &&
464                       (flags & SCTP_ADDR4_PEERSUPP))) ||
465                     (((AF_INET6 == addr->sa.sa_family) &&
466                       (flags & SCTP_ADDR6_ALLOWED) &&
467                       (flags & SCTP_ADDR6_PEERSUPP))))
468                         error = sctp_add_bind_addr(dest, addr, sizeof(*addr),
469                                                    SCTP_ADDR_SRC, gfp);
470         }
471 
472         return error;
473 }
474 
475 /* Is this a wildcard address?  */
476 int sctp_is_any(struct sock *sk, const union sctp_addr *addr)
477 {
478         unsigned short fam = 0;
479         struct sctp_af *af;
480 
481         /* Try to get the right address family */
482         if (addr->sa.sa_family != AF_UNSPEC)
483                 fam = addr->sa.sa_family;
484         else if (sk)
485                 fam = sk->sk_family;
486 
487         af = sctp_get_af_specific(fam);
488         if (!af)
489                 return 0;
490 
491         return af->is_any(addr);
492 }
493 
494 /* Is 'addr' valid for 'scope'?  */
495 int sctp_in_scope(struct net *net, const union sctp_addr *addr,
496                   enum sctp_scope scope)
497 {
498         enum sctp_scope addr_scope = sctp_scope(addr);
499 
500         /* The unusable SCTP addresses will not be considered with
501          * any defined scopes.
502          */
503         if (SCTP_SCOPE_UNUSABLE == addr_scope)
504                 return 0;
505         /*
506          * For INIT and INIT-ACK address list, let L be the level of
507          * of requested destination address, sender and receiver
508          * SHOULD include all of its addresses with level greater
509          * than or equal to L.
510          *
511          * Address scoping can be selectively controlled via sysctl
512          * option
513          */
514         switch (net->sctp.scope_policy) {
515         case SCTP_SCOPE_POLICY_DISABLE:
516                 return 1;
517         case SCTP_SCOPE_POLICY_ENABLE:
518                 if (addr_scope <= scope)
519                         return 1;
520                 break;
521         case SCTP_SCOPE_POLICY_PRIVATE:
522                 if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
523                         return 1;
524                 break;
525         case SCTP_SCOPE_POLICY_LINK:
526                 if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
527                         return 1;
528                 break;
529         default:
530                 break;
531         }
532 
533         return 0;
534 }
535 
536 int sctp_is_ep_boundall(struct sock *sk)
537 {
538         struct sctp_bind_addr *bp;
539         struct sctp_sockaddr_entry *addr;
540 
541         bp = &sctp_sk(sk)->ep->base.bind_addr;
542         if (sctp_list_single_entry(&bp->address_list)) {
543                 addr = list_entry(bp->address_list.next,
544                                   struct sctp_sockaddr_entry, list);
545                 if (sctp_is_any(sk, &addr->a))
546                         return 1;
547         }
548         return 0;
549 }
550 
551 /********************************************************************
552  * 3rd Level Abstractions
553  ********************************************************************/
554 
555 /* What is the scope of 'addr'?  */
556 enum sctp_scope sctp_scope(const union sctp_addr *addr)
557 {
558         struct sctp_af *af;
559 
560         af = sctp_get_af_specific(addr->sa.sa_family);
561         if (!af)
562                 return SCTP_SCOPE_UNUSABLE;
563 
564         return af->scope((union sctp_addr *)addr);
565 }
566 

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