scope6.c

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    1 /*      $FreeBSD: releng/6.0/sys/netinet6/scope6.c 139826 2005-01-07 02:30:35Z imp $    */
    2 /*      $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */
    3 
    4 /*-
    5  * Copyright (C) 2000 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/malloc.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/socket.h>
   37 #include <sys/systm.h>
   38 #include <sys/queue.h>
   39 
   40 #include <net/route.h>
   41 #include <net/if.h>
   42 
   43 #include <netinet/in.h>
   44 
   45 #include <netinet6/in6_var.h>
   46 #include <netinet6/scope6_var.h>
   47 
   48 /*
   49  * The scope6_lock protects the global sid default stored in
   50  * sid_default below.
   51  */
   52 static struct mtx scope6_lock;
   53 #define SCOPE6_LOCK_INIT()      mtx_init(&scope6_lock, "scope6_lock", NULL, MTX_DEF)
   54 #define SCOPE6_LOCK()           mtx_lock(&scope6_lock)
   55 #define SCOPE6_UNLOCK()         mtx_unlock(&scope6_lock)
   56 #define SCOPE6_LOCK_ASSERT()    mtx_assert(&scope6_lock, MA_OWNED)
   57 
   58 static struct scope6_id sid_default;
   59 #define SID(ifp) \
   60         (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id)
   61 
   62 void
   63 scope6_init()
   64 {
   65 
   66         SCOPE6_LOCK_INIT();
   67         bzero(&sid_default, sizeof(sid_default));
   68 }
   69 
   70 struct scope6_id *
   71 scope6_ifattach(ifp)
   72         struct ifnet *ifp;
   73 {
   74         struct scope6_id *sid;
   75 
   76         sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK);
   77         bzero(sid, sizeof(*sid));
   78 
   79         /*
   80          * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard.
   81          * Should we rather hardcode here?
   82          */
   83         sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index;
   84         sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index;
   85 #ifdef MULTI_SCOPE
   86         /* by default, we don't care about scope boundary for these scopes. */
   87         sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1;
   88         sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1;
   89 #endif
   90 
   91         return sid;
   92 }
   93 
   94 void
   95 scope6_ifdetach(sid)
   96         struct scope6_id *sid;
   97 {
   98 
   99         free(sid, M_IFADDR);
  100 }
  101 
  102 int
  103 scope6_set(ifp, idlist)
  104         struct ifnet *ifp;
  105         struct scope6_id *idlist;
  106 {
  107         int i;
  108         int error = 0;
  109         struct scope6_id *sid = NULL;
  110 
  111         IF_AFDATA_LOCK(ifp);
  112         sid = SID(ifp);
  113 
  114         if (!sid) {     /* paranoid? */
  115                 IF_AFDATA_UNLOCK(ifp);
  116                 return (EINVAL);
  117         }
  118 
  119         /*
  120          * XXX: We need more consistency checks of the relationship among
  121          * scopes (e.g. an organization should be larger than a site).
  122          */
  123 
  124         /*
  125          * TODO(XXX): after setting, we should reflect the changes to
  126          * interface addresses, routing table entries, PCB entries...
  127          */
  128 
  129         SCOPE6_LOCK();
  130         for (i = 0; i < 16; i++) {
  131                 if (idlist->s6id_list[i] &&
  132                     idlist->s6id_list[i] != sid->s6id_list[i]) {
  133                         /*
  134                          * An interface zone ID must be the corresponding
  135                          * interface index by definition.
  136                          */
  137                         if (i == IPV6_ADDR_SCOPE_INTFACELOCAL &&
  138                             idlist->s6id_list[i] != ifp->if_index) {
  139                                 IF_AFDATA_UNLOCK(ifp);
  140                                 SCOPE6_UNLOCK();
  141                                 return (EINVAL);
  142                         }
  143 
  144                         if (i == IPV6_ADDR_SCOPE_LINKLOCAL &&
  145                             idlist->s6id_list[i] > if_index) {
  146                                 /*
  147                                  * XXX: theoretically, there should be no
  148                                  * relationship between link IDs and interface
  149                                  * IDs, but we check the consistency for
  150                                  * safety in later use.
  151                                  */
  152                                 IF_AFDATA_UNLOCK(ifp);
  153                                 SCOPE6_UNLOCK();
  154                                 return (EINVAL);
  155                         }
  156 
  157                         /*
  158                          * XXX: we must need lots of work in this case,
  159                          * but we simply set the new value in this initial
  160                          * implementation.
  161                          */
  162                         sid->s6id_list[i] = idlist->s6id_list[i];
  163                 }
  164         }
  165         SCOPE6_UNLOCK();
  166         IF_AFDATA_UNLOCK(ifp);
  167 
  168         return (error);
  169 }
  170 
  171 int
  172 scope6_get(ifp, idlist)
  173         struct ifnet *ifp;
  174         struct scope6_id *idlist;
  175 {
  176         /* We only need to lock the interface's afdata for SID() to work. */
  177         IF_AFDATA_LOCK(ifp);
  178         struct scope6_id *sid = SID(ifp);
  179 
  180         if (sid == NULL) {      /* paranoid? */
  181                 IF_AFDATA_UNLOCK(ifp);
  182                 return (EINVAL);
  183         }
  184 
  185         SCOPE6_LOCK();
  186         *idlist = *sid;
  187         SCOPE6_UNLOCK();
  188 
  189         IF_AFDATA_UNLOCK(ifp);
  190         return (0);
  191 }
  192 
  193 
  194 /*
  195  * Get a scope of the address. Node-local, link-local, site-local or global.
  196  */
  197 int
  198 in6_addrscope(addr)
  199         struct in6_addr *addr;
  200 {
  201         int scope;
  202 
  203         if (addr->s6_addr[0] == 0xfe) {
  204                 scope = addr->s6_addr[1] & 0xc0;
  205 
  206                 switch (scope) {
  207                 case 0x80:
  208                         return IPV6_ADDR_SCOPE_LINKLOCAL;
  209                         break;
  210                 case 0xc0:
  211                         return IPV6_ADDR_SCOPE_SITELOCAL;
  212                         break;
  213                 default:
  214                         return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */
  215                         break;
  216                 }
  217         }
  218 
  219 
  220         if (addr->s6_addr[0] == 0xff) {
  221                 scope = addr->s6_addr[1] & 0x0f;
  222 
  223                 /*
  224                  * due to other scope such as reserved,
  225                  * return scope doesn't work.
  226                  */
  227                 switch (scope) {
  228                 case IPV6_ADDR_SCOPE_INTFACELOCAL:
  229                         return IPV6_ADDR_SCOPE_INTFACELOCAL;
  230                         break;
  231                 case IPV6_ADDR_SCOPE_LINKLOCAL:
  232                         return IPV6_ADDR_SCOPE_LINKLOCAL;
  233                         break;
  234                 case IPV6_ADDR_SCOPE_SITELOCAL:
  235                         return IPV6_ADDR_SCOPE_SITELOCAL;
  236                         break;
  237                 default:
  238                         return IPV6_ADDR_SCOPE_GLOBAL;
  239                         break;
  240                 }
  241         }
  242 
  243         /*
  244          * Regard loopback and unspecified addresses as global, since
  245          * they have no ambiguity.
  246          */
  247         if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) {
  248                 if (addr->s6_addr[15] == 1) /* loopback */
  249                         return IPV6_ADDR_SCOPE_LINKLOCAL;
  250                 if (addr->s6_addr[15] == 0) /* unspecified */
  251                         return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */
  252         }
  253 
  254         return IPV6_ADDR_SCOPE_GLOBAL;
  255 }
  256 
  257 /*
  258  * When we introduce the "4+28" split semantics in sin6_scope_id,
  259  * a 32bit integer is not enough to tell a large ID from an error (-1).
  260  * So, we intentionally use a large type as the return value.
  261  */
  262 int
  263 in6_addr2zoneid(ifp, addr, ret_id)
  264         struct ifnet *ifp;      /* must not be NULL */
  265         struct in6_addr *addr;  /* must not be NULL */
  266         u_int32_t *ret_id;      /* must not be NULL */
  267 {
  268         int scope;
  269         u_int32_t zoneid = 0;
  270         struct scope6_id *sid = NULL;
  271 
  272         IF_AFDATA_LOCK(ifp);
  273 
  274         sid = SID(ifp);
  275 
  276 #ifdef DIAGNOSTIC
  277         if (sid == NULL) { /* should not happen */
  278                 panic("in6_addr2zoneid: scope array is NULL");
  279                 /* NOTREACHED */
  280         }
  281         if (ret_id == NULL) {
  282                 panic("in6_addr2zoneid: return ID is null");
  283                 /* NOTREACHED */
  284         }
  285 #endif
  286 
  287         /*
  288          * special case: the loopback address can only belong to a loopback
  289          * interface.
  290          */
  291         if (IN6_IS_ADDR_LOOPBACK(addr)) {
  292                 if (!(ifp->if_flags & IFF_LOOPBACK)) {
  293                         IF_AFDATA_UNLOCK(ifp);
  294                         return (-1);
  295                 } else {
  296                         *ret_id = 0; /* there's no ambiguity */
  297                         IF_AFDATA_UNLOCK(ifp);
  298                         return (0);
  299                 }
  300         }
  301 
  302         scope = in6_addrscope(addr);
  303 
  304         /*
  305          * XXX: These are all u_int32_t reads, so may not require locking.
  306          */
  307         SCOPE6_LOCK();
  308         switch (scope) {
  309         case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */
  310                 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL];
  311                 break;
  312 
  313         case IPV6_ADDR_SCOPE_LINKLOCAL:
  314                 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL];
  315                 break;
  316 
  317         case IPV6_ADDR_SCOPE_SITELOCAL:
  318                 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL];
  319                 break;
  320 
  321         case IPV6_ADDR_SCOPE_ORGLOCAL:
  322                 zoneid = sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL];
  323                 break;
  324 
  325         default:
  326                 zoneid = 0;     /* XXX: treat as global. */
  327                 break;
  328         }
  329         SCOPE6_UNLOCK();
  330 
  331         *ret_id = zoneid;
  332         
  333         IF_AFDATA_UNLOCK(ifp);
  334 
  335         return (0);
  336 }
  337 
  338 void
  339 scope6_setdefault(ifp)
  340         struct ifnet *ifp;      /* note that this might be NULL */
  341 {
  342         /*
  343          * Currently, this function just sets the default "interfaces"
  344          * and "links" according to the given interface.
  345          * We might eventually have to separate the notion of "link" from
  346          * "interface" and provide a user interface to set the default.
  347          */
  348         SCOPE6_LOCK();
  349         if (ifp) {
  350                 sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] =
  351                         ifp->if_index;
  352                 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] =
  353                         ifp->if_index;
  354         } else {
  355                 sid_default.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0;
  356                 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0;
  357         }
  358         SCOPE6_UNLOCK();
  359 }
  360 
  361 int
  362 scope6_get_default(idlist)
  363         struct scope6_id *idlist;
  364 {
  365 
  366         SCOPE6_LOCK();
  367         *idlist = sid_default;
  368         SCOPE6_UNLOCK();
  369 
  370         return (0);
  371 }
  372 
  373 u_int32_t
  374 scope6_addr2default(addr)
  375         struct in6_addr *addr;
  376 {
  377         u_int32_t id;
  378 
  379         /*
  380          * special case: The loopback address should be considered as
  381          * link-local, but there's no ambiguity in the syntax.
  382          */
  383         if (IN6_IS_ADDR_LOOPBACK(addr))
  384                 return (0);
  385 
  386         /*
  387          * XXX: 32-bit read is atomic on all our platforms, is it OK
  388          * not to lock here?
  389          */
  390         SCOPE6_LOCK();
  391         id = sid_default.s6id_list[in6_addrscope(addr)];
  392         SCOPE6_UNLOCK();
  393         return (id);
  394 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/scope6.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/scope6.c
