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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  * $FreeBSD: src/sys/netinet/if_atm.c,v 1.8.2.1 2001/12/20 10:30:18 ru Exp $
   35  * $DragonFly: src/sys/netinet/if_atm.c,v 1.9 2006/12/22 23:57:52 swildner Exp $
   36  */
   37 
   38 /*
   39  * IP <=> ATM address resolution.
   40  */
   41 
   42 #include "opt_inet.h"
   43 #include "opt_inet6.h"
   44 #include "opt_natm.h"
   45 
   46 #if defined(INET) || defined(INET6)
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/queue.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/socket.h>
   53 #include <sys/sockio.h>
   54 #include <sys/syslog.h>
   55 
   56 #include <net/if.h>
   57 #include <net/if_dl.h>
   58 #include <net/route.h>
   59 #include <net/if_atm.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/if_atm.h>
   63 
   64 #ifdef NATM
   65 #include <netproto/natm/natm.h>
   66 #endif
   67 
   68 
   69 #define SDL(s) ((struct sockaddr_dl *)s)
   70 
   71 /*
   72  * atm_rtrequest: handle ATM rt request (in support of generic code)
   73  *   inputs: "req" = request code
   74  *           "rt" = route entry
   75  *           "info" = rt_addrinfo
   76  */
   77 void
   78 atm_rtrequest(int req, struct rtentry *rt)
   79 {
   80         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         int error;
   89 
   90         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
   91                 return;
   92 
   93         switch (req) {
   94 
   95         case RTM_RESOLVE: /* resolve: only happens when cloning */
   96                 kprintf("atm_rtrequest: RTM_RESOLVE request detected?\n");
   97                 break;
   98 
   99         case RTM_ADD:
  100 
  101                 /*
  102                  * route added by a command (e.g. ifconfig, route, arp...).
  103                  *
  104                  * first check to see if this is not a host route, in which
  105                  * case we are being called via "ifconfig" to set the address.
  106                  */
  107 
  108                 if ((rt->rt_flags & RTF_HOST) == 0) {
  109                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl,
  110                                    RTL_DONTREPORT);
  111                         gate = rt->rt_gateway;
  112                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  113                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  114                         break;
  115                 }
  116 
  117                 if ((rt->rt_flags & RTF_CLONING) != 0) {
  118                         kprintf("atm_rtrequest: cloning route detected?\n");
  119                         break;
  120                 }
  121                 if (gate->sa_family != AF_LINK ||
  122                     gate->sa_len < sizeof(null_sdl)) {
  123                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
  124                         break;
  125                 }
  126 
  127 #ifdef DIAGNOSTIC
  128                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
  129 #endif
  130 
  131 #ifdef NATM
  132                 /*
  133                  * let native ATM know we are using this VCI/VPI
  134                  * (i.e. reserve it)
  135                  */
  136                 sin = (struct sockaddr_in *) rt_key(rt);
  137                 if (sin->sin_family != AF_INET)
  138                         goto failed;
  139                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
  140                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
  141                                                 ATM_PH_VPI(aph));
  142                 if (npcb == NULL)
  143                         goto failed;
  144                 npcb->npcb_flags |= NPCB_IP;
  145                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  146                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  147                 rt->rt_llinfo =  npcb;
  148                 rt->rt_flags |= RTF_LLINFO;
  149 #endif
  150                 /*
  151                  * let the lower level know this circuit is active
  152                  */
  153                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
  154                 api.rxhand = NULL;
  155                 ifnet_serialize_all(rt->rt_ifp);
  156                 error = rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA,
  157                                              (caddr_t)&api, NULL);
  158                 ifnet_deserialize_all(rt->rt_ifp);
  159                 if (error) {
  160                         kprintf("atm: couldn't add VC\n");
  161                         goto failed;
  162                 }
  163 
  164                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  165                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  166 
  167                 break;
  168 
  169 failed:
  170 #ifdef NATM
  171                 if (npcb) {
  172                         npcb_free(npcb, NPCB_DESTROY);
  173                         rt->rt_llinfo = NULL;
  174                         rt->rt_flags &= ~RTF_LLINFO;
  175                 }
  176 #endif
  177                 rtrequest(RTM_DELETE, rt_key(rt), NULL,
  178                     rt_mask(rt), 0, NULL);
  179                 break;
  180 
  181         case RTM_DELETE:
  182 
  183 #ifdef NATM
  184                 /*
  185                  * tell native ATM we are done with this VC
  186                  */
  187 
  188                 if (rt->rt_flags & RTF_LLINFO) {
  189                         npcb_free(rt->rt_llinfo, NPCB_DESTROY);
  190                         rt->rt_llinfo = NULL;
  191                         rt->rt_flags &= ~RTF_LLINFO;
  192                 }
  193 #endif
  194                 /*
  195                  * tell the lower layer to disable this circuit
  196                  */
  197 
  198                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
  199                 api.rxhand = NULL;
  200                 ifnet_serialize_all(rt->rt_ifp);
  201                 rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS, (caddr_t)&api,
  202                                      NULL);
  203                 ifnet_deserialize_all(rt->rt_ifp);
  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, struct sockaddr *dst,
  226            struct atm_pseudohdr *desten)
  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 */

Cache object: 804d398f485cf2514e0f7c630c5c4c37


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