The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/if_atm.c

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    1 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
    2 
    3 /*
    4  *
    5  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    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. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Charles D. Cranor and 
   19  *      Washington University.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 /*
   36  * IP <=> ATM address resolution.
   37  */
   38 
   39 #include "opt_inet.h"
   40 #include "opt_natm.h"
   41 
   42 #if defined(INET) || defined(INET6)
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/queue.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/sockio.h>
   50 #include <sys/syslog.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/if_atm.h>
   59 
   60 #ifdef NATM
   61 #include <netnatm/natm.h>
   62 #endif
   63 
   64 
   65 #define SDL(s) ((struct sockaddr_dl *)s)
   66 
   67 /*
   68  * atm_rtrequest: handle ATM rt request (in support of generic code)
   69  *   inputs: "req" = request code
   70  *           "rt" = route entry
   71  *           "sa" = sockaddr
   72  */
   73 
   74 void
   75 atm_rtrequest(req, rt, sa)
   76         int req;
   77         register struct rtentry *rt;
   78         struct sockaddr *sa;
   79 {
   80         register struct sockaddr *gate = rt->rt_gateway;
   81         struct atm_pseudoioctl api;
   82 #ifdef NATM
   83         struct sockaddr_in *sin;
   84         struct natmpcb *npcb = NULL;
   85         struct atm_pseudohdr *aph;
   86 #endif
   87         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
   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                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
  109                         gate = rt->rt_gateway;
  110                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  111                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  112                         break;
  113                 }
  114 
  115                 if ((rt->rt_flags & RTF_CLONING) != 0) {
  116                         printf("atm_rtrequest: cloning route detected?\n");
  117                         break;
  118                 }
  119                 if (gate->sa_family != AF_LINK ||
  120                     gate->sa_len < sizeof(null_sdl)) {
  121                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
  122                         break;
  123                 }
  124 
  125 #ifdef DIAGNOSTIC
  126                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
  127 #endif
  128 
  129 #ifdef NATM
  130                 /*
  131                  * let native ATM know we are using this VCI/VPI
  132                  * (i.e. reserve it)
  133                  */
  134                 sin = (struct sockaddr_in *) rt_key(rt);
  135                 if (sin->sin_family != AF_INET)
  136                         goto failed;
  137                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
  138                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph), 
  139                                                 ATM_PH_VPI(aph));
  140                 if (npcb == NULL) 
  141                         goto failed;
  142                 npcb->npcb_flags |= NPCB_IP;
  143                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  144                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  145                 rt->rt_llinfo = (caddr_t) npcb;
  146                 rt->rt_flags |= RTF_LLINFO;
  147 #endif
  148                 /*
  149                  * let the lower level know this circuit is active
  150                  */
  151                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
  152                 api.rxhand = NULL;
  153                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA, 
  154                                                         (caddr_t)&api) != 0) {
  155                         printf("atm: couldn't add VC\n");
  156                         goto failed;
  157                 }
  158 
  159                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  160                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  161 
  162                 break;
  163 
  164 failed:
  165 #ifdef NATM
  166                 if (npcb) {
  167                         npcb_free(npcb, NPCB_DESTROY);
  168                         rt->rt_llinfo = NULL;
  169                         rt->rt_flags &= ~RTF_LLINFO;
  170                 }
  171 #endif
  172                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
  173                         rt_mask(rt), 0, (struct rtentry **) 0);
  174                 break;
  175 
  176         case RTM_DELETE:
  177 
  178 #ifdef NATM
  179                 /*
  180                  * tell native ATM we are done with this VC
  181                  */
  182 
  183                 if (rt->rt_flags & RTF_LLINFO) {
  184                         npcb_free((struct natmpcb *)rt->rt_llinfo, 
  185                                                                 NPCB_DESTROY);
  186                         rt->rt_llinfo = NULL;
  187                         rt->rt_flags &= ~RTF_LLINFO;
  188                 }
  189 #endif
  190                 /*
  191                  * tell the lower layer to disable this circuit
  192                  */
  193 
  194                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
  195                 api.rxhand = NULL;
  196                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, 
  197                                                         (caddr_t)&api);
  198 
  199                 break;
  200         }
  201 }
  202 
  203 /*
  204  * atmresolve:
  205  *   inputs:
  206  *     [1] "rt" = the link level route to use (or null if need to look one up)
  207  *     [2] "m" = mbuf containing the data to be sent
  208  *     [3] "dst" = sockaddr_in (IP) address of dest.
  209  *   output:
  210  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
  211  *   return: 
  212  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
  213  *     1 == resolve OK; desten contains result
  214  *
  215  *   XXX: will need more work if we wish to support ATMARP in the kernel,
  216  *   but this is enough for PVCs entered via the "route" command.
  217  */
  218 
  219 int
  220 atmresolve(rt, m, dst, desten)
  221 
  222 register struct rtentry *rt;
  223 struct mbuf *m;
  224 register struct sockaddr *dst;
  225 register struct atm_pseudohdr *desten;  /* OUT */
  226 
  227 {
  228         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 = SDL(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                 bcopy(LLADDR(sdl), desten, 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 */

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