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sys/netinet/if_atm.c

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    1 /*      $NetBSD: if_atm.c,v 1.32 2011/02/01 19:43:12 chuck Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 /*
   29  * IP <=> ATM address resolution.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: if_atm.c,v 1.32 2011/02/01 19:43:12 chuck Exp $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_natm.h"
   37 
   38 #if defined(INET) || defined(INET6)
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/socket.h>
   45 #include <sys/time.h>
   46 #include <sys/kernel.h>
   47 #include <sys/errno.h>
   48 #include <sys/ioctl.h>
   49 #include <sys/syslog.h>
   50 #include <sys/proc.h>
   51 
   52 #include <net/if.h>
   53 #include <net/if_dl.h>
   54 #include <net/route.h>
   55 #include <net/if_atm.h>
   56 
   57 #include <netinet/in.h>
   58 #include <netinet/in_systm.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip.h>
   61 #include <netinet/if_atm.h>
   62 
   63 #ifdef NATM
   64 #include <netnatm/natm.h>
   65 #endif
   66 
   67 
   68 /*
   69  * atm_rtrequest: handle ATM rt request (in support of generic code)
   70  *   inputs: "req" = request code
   71  *           "rt" = route entry
   72  *           "sa" = sockaddr
   73  */
   74 
   75 void
   76 atm_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info)
   77 {
   78         struct sockaddr *gate = rt->rt_gateway;
   79         struct atm_pseudoioctl api;
   80 #ifdef NATM
   81         const struct sockaddr_in *sin;
   82         struct natmpcb *npcb = NULL;
   83         const struct atm_pseudohdr *aph;
   84 #endif
   85         const struct ifnet *ifp = rt->rt_ifp;
   86         uint8_t namelen = strlen(ifp->if_xname);
   87         uint8_t addrlen = ifp->if_addrlen;
   88 
   89         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
   90                 return;
   91 
   92         switch (req) {
   93 
   94         case RTM_RESOLVE: /* resolve: only happens when cloning */
   95                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
   96                 break;
   97 
   98         case RTM_ADD:
   99 
  100                 /*
  101                  * route added by a command (e.g. ifconfig, route, arp...).
  102                  *
  103                  * first check to see if this is not a host route, in which
  104                  * case we are being called via "ifconfig" to set the address.
  105                  */
  106 
  107                 if ((rt->rt_flags & RTF_HOST) == 0) {
  108                         union {
  109                                 struct sockaddr sa;
  110                                 struct sockaddr_dl sdl;
  111                                 struct sockaddr_storage ss;
  112                         } u;
  113 
  114                         sockaddr_dl_init(&u.sdl, sizeof(u.ss),
  115                             ifp->if_index, ifp->if_type,
  116                             NULL, namelen, NULL, addrlen);
  117                         rt_setgate(rt, &u.sa);
  118                         gate = rt->rt_gateway;
  119                         break;
  120                 }
  121 
  122                 if ((rt->rt_flags & RTF_CLONING) != 0) {
  123                         printf("atm_rtrequest: cloning route detected?\n");
  124                         break;
  125                 }
  126                 if (gate->sa_family != AF_LINK ||
  127                     gate->sa_len < sockaddr_dl_measure(namelen, addrlen)) {
  128                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
  129                         break;
  130                 }
  131 
  132 #ifdef DIAGNOSTIC
  133                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
  134 #endif
  135 
  136 #ifdef NATM
  137                 /*
  138                  * let native ATM know we are using this VCI/VPI
  139                  * (i.e. reserve it)
  140                  */
  141                 sin = satocsin(rt_getkey(rt));
  142                 if (sin->sin_family != AF_INET)
  143                         goto failed;
  144                 aph = (const struct atm_pseudohdr *)CLLADDR(satosdl(gate));
  145                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
  146                                                 ATM_PH_VPI(aph));
  147                 if (npcb == NULL)
  148                         goto failed;
  149                 npcb->npcb_flags |= NPCB_IP;
  150                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  151                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  152                 rt->rt_llinfo = (void *) npcb;
  153                 rt->rt_flags |= RTF_LLINFO;
  154 #endif
  155                 /*
  156                  * let the lower level know this circuit is active
  157                  */
  158                 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
  159                 api.rxhand = NULL;
  160                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, &api) != 0) {
  161                         printf("atm: couldn't add VC\n");
  162                         goto failed;
  163                 }
  164 
  165                 satosdl(gate)->sdl_type = rt->rt_ifp->if_type;
  166                 satosdl(gate)->sdl_index = rt->rt_ifp->if_index;
  167 
  168                 break;
  169 
  170 failed:
  171 #ifdef NATM
  172                 if (npcb) {
  173                         npcb_free(npcb, NPCB_DESTROY);
  174                         rt->rt_llinfo = NULL;
  175                         rt->rt_flags &= ~RTF_LLINFO;
  176                 }
  177 #endif
  178                 rtrequest(RTM_DELETE, rt_getkey(rt), NULL,
  179                         rt_mask(rt), 0, NULL);
  180                 break;
  181 
  182         case RTM_DELETE:
  183 
  184 #ifdef NATM
  185                 /*
  186                  * tell native ATM we are done with this VC
  187                  */
  188 
  189                 if (rt->rt_flags & RTF_LLINFO) {
  190                         npcb_free((struct natmpcb *)rt->rt_llinfo,
  191                                                                 NPCB_DESTROY);
  192                         rt->rt_llinfo = NULL;
  193                         rt->rt_flags &= ~RTF_LLINFO;
  194                 }
  195 #endif
  196                 /*
  197                  * tell the lower layer to disable this circuit
  198                  */
  199 
  200                 memcpy(&api.aph, CLLADDR(satocsdl(gate)), sizeof(api.aph));
  201                 api.rxhand = NULL;
  202                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, &api);
  203 
  204                 break;
  205         }
  206 }
  207 
  208 /*
  209  * atmresolve:
  210  *   inputs:
  211  *     [1] "rt" = the link level route to use (or null if need to look one up)
  212  *     [2] "m" = mbuf containing the data to be sent
  213  *     [3] "dst" = sockaddr_in (IP) address of dest.
  214  *   output:
  215  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
  216  *   return:
  217  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
  218  *     1 == resolve OK; desten contains result
  219  *
  220  *   XXX: will need more work if we wish to support ATMARP in the kernel,
  221  *   but this is enough for PVCs entered via the "route" command.
  222  */
  223 
  224 int
  225 atmresolve(struct rtentry *rt, struct mbuf *m, const struct sockaddr *dst,
  226     struct atm_pseudohdr *desten /* OUT */)
  227 {
  228         const struct sockaddr_dl *sdl;
  229 
  230         if (m->m_flags & (M_BCAST|M_MCAST)) {
  231                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
  232                 goto bad;
  233         }
  234 
  235         if (rt == NULL) {
  236                 rt = RTALLOC1(dst, 0);
  237                 if (rt == NULL) goto bad; /* failed */
  238                 rt->rt_refcnt--;        /* don't keep LL references */
  239                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
  240                         (rt->rt_flags & RTF_LLINFO) == 0 ||
  241                         /* XXX: are we using LLINFO? */
  242                         rt->rt_gateway->sa_family != AF_LINK) {
  243                                 goto bad;
  244                 }
  245         }
  246 
  247         /*
  248          * note that rt_gateway is a sockaddr_dl which contains the
  249          * atm_pseudohdr data structure for this route.   we currently
  250          * don't need any rt_llinfo info (but will if we want to support
  251          * ATM ARP [c.f. if_ether.c]).
  252          */
  253 
  254         sdl = satocsdl(rt->rt_gateway);
  255 
  256         /*
  257          * Check the address family and length is valid, the address
  258          * is resolved; otherwise, try to resolve.
  259          */
  260 
  261 
  262         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
  263                 memcpy(desten, CLLADDR(sdl), sdl->sdl_alen);
  264                 return (1);     /* ok, go for it! */
  265         }
  266 
  267         /*
  268          * we got an entry, but it doesn't have valid link address
  269          * info in it (it is prob. the interface route, which has
  270          * sdl_alen == 0).    dump packet.  (fall through to "bad").
  271          */
  272 
  273 bad:
  274         m_freem(m);
  275         return (0);
  276 }
  277 #endif /* INET */

Cache object: c0f5278948980cccc3cb2f395310a2b7


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