bsd/netinet/if_atm.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
  23
  24 /*
  25  *
  26  * Copyright (c) 1996 Charles D. Cranor and Washington University.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by Charles D. Cranor and
  40  *      Washington University.
  41  * 4. The name of the author may not be used to endorse or promote products
  42  *    derived from this software without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  45  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  47  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  48  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  49  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  53  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 /*
  57  * IP <=> ATM address resolution.
  58  */
  59
  60 #include "opt_inet.h"
  61 #include "opt_natm.h"
  62
  63 #if defined(INET) || defined(INET6)
  64
  65 #include <sys/param.h>
  66 #include <sys/systm.h>
  67 #include <sys/queue.h>
  68 #include <sys/mbuf.h>
  69 #include <sys/socket.h>
  70 #include <sys/sockio.h>
  71 #include <sys/syslog.h>
  72
  73 #include <net/if.h>
  74 #include <net/if_dl.h>
  75 #include <net/route.h>
  76 #include <net/if_atm.h>
  77
  78 #include <netinet/in.h>
  79 #include <netinet/if_atm.h>
  80 #include <net/dlil.h>
  81
  82
  83 #if NATM
  84 #include <netnatm/natm.h>
  85 #endif
  86
  87
  88 #define SDL(s) ((struct sockaddr_dl *)s)
  89
  90 /*
  91  * atm_rtrequest: handle ATM rt request (in support of generic code)
  92  *   inputs: "req" = request code
  93  *           "rt" = route entry
  94  *           "sa" = sockaddr
  95  */
  96
  97 void
  98 atm_rtrequest(req, rt, sa)
  99         int req;
 100         register struct rtentry *rt;
 101         struct sockaddr *sa;
 102 {
 103         register struct sockaddr *gate = rt->rt_gateway;
 104         struct atm_pseudoioctl api;
 105 #if NATM
 106         struct sockaddr_in *sin;
 107         struct natmpcb *npcb = NULL;
 108         struct atm_pseudohdr *aph;
 109 #endif
 110         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 111
 112         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
 113                 return;
 114
 115         switch (req) {
 116
 117         case RTM_RESOLVE: /* resolve: only happens when cloning */
 118                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
 119                 break;
 120
 121         case RTM_ADD:
 122
 123                 /*
 124                  * route added by a command (e.g. ifconfig, route, arp...).
 125                  *
 126                  * first check to see if this is not a host route, in which
 127                  * case we are being called via "ifconfig" to set the address.
 128                  */
 129
 130                 if ((rt->rt_flags & RTF_HOST) == 0) {
 131                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
 132                         gate = rt->rt_gateway;
 133                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 134                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 135                         break;
 136                 }
 137
 138                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 139                         printf("atm_rtrequest: cloning route detected?\n");
 140                         break;
 141                 }
 142                 if (gate->sa_family != AF_LINK ||
 143                     gate->sa_len < sizeof(null_sdl)) {
 144                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 145                         break;
 146                 }
 147
 148 #if DIAGNOSTIC
 149                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 150 #endif
 151
 152 #if NATM
 153                 /*
 154                  * let native ATM know we are using this VCI/VPI
 155                  * (i.e. reserve it)
 156                  */
 157                 sin = (struct sockaddr_in *) rt_key(rt);
 158                 if (sin->sin_family != AF_INET)
 159                         goto failed;
 160                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
 161                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 162                                                 ATM_PH_VPI(aph));
 163                 if (npcb == NULL)
 164                         goto failed;
 165                 npcb->npcb_flags |= NPCB_IP;
 166                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 167                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 168                 rt->rt_llinfo = (caddr_t) npcb;
 169                 rt->rt_flags |= RTF_LLINFO;
 170 #endif
 171                 /*
 172                  * let the lower level know this circuit is active
 173                  */
 174                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 175                 api.rxhand = NULL;
 176                 if (dlil_ioctl(0, rt->rt_ifp, SIOCATMENA,
 177                                                         (caddr_t)&api) != 0) {
 178                         printf("atm: couldn't add VC\n");
 179                         goto failed;
 180                 }
 181
 182                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 183                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 184
 185                 break;
 186
 187 failed:
 188 #if NATM
 189                 if (npcb) {
 190                         npcb_free(npcb, NPCB_DESTROY);
 191                         rt->rt_llinfo = NULL;
 192                         rt->rt_flags &= ~RTF_LLINFO;
 193                 }
 194 #endif
 195                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
 196                         rt_mask(rt), 0, (struct rtentry **) 0);
 197                 break;
 198
 199         case RTM_DELETE:
 200
 201 #if NATM
 202                 /*
 203                  * tell native ATM we are done with this VC
 204                  */
 205
 206                 if (rt->rt_flags & RTF_LLINFO) {
 207                         npcb_free((struct natmpcb *)rt->rt_llinfo,
 208                                                                 NPCB_DESTROY);
 209                         rt->rt_llinfo = NULL;
 210                         rt->rt_flags &= ~RTF_LLINFO;
 211                 }
 212 #endif
 213                 /*
 214                  * tell the lower layer to disable this circuit
 215                  */
 216
 217                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 218                 api.rxhand = NULL;
 219                 dlil_ioctl(0, rt->rt_ifp, SIOCATMDIS,
 220                                                         (caddr_t)&api);
 221
 222                 break;
 223         }
 224 }
 225
 226 /*
 227  * atmresolve:
 228  *   inputs:
 229  *     [1] "rt" = the link level route to use (or null if need to look one up)
 230  *     [2] "m" = mbuf containing the data to be sent
 231  *     [3] "dst" = sockaddr_in (IP) address of dest.
 232  *   output:
 233  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 234  *   return:
 235  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 236  *     1 == resolve OK; desten contains result
 237  *
 238  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 239  *   but this is enough for PVCs entered via the "route" command.
 240  */
 241
 242 int
 243 atmresolve(rt, m, dst, desten)
 244
 245 register struct rtentry *rt;
 246 struct mbuf *m;
 247 register struct sockaddr *dst;
 248 register struct atm_pseudohdr *desten;  /* OUT */
 249
 250 {
 251         struct sockaddr_dl *sdl;
 252
 253         if (m->m_flags & (M_BCAST|M_MCAST)) {
 254                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 255                 goto bad;
 256         }
 257
 258         if (rt == NULL) {
 259                 rt = RTALLOC1(dst, 0);
 260                 if (rt == NULL) goto bad; /* failed */
 261                 rt->rt_refcnt--;        /* don't keep LL references */
 262                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 263                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 264                         /* XXX: are we using LLINFO? */
 265                         rt->rt_gateway->sa_family != AF_LINK) {
 266                                 goto bad;
 267                 }
 268         }
 269
 270         /*
 271          * note that rt_gateway is a sockaddr_dl which contains the
 272          * atm_pseudohdr data structure for this route.   we currently
 273          * don't need any rt_llinfo info (but will if we want to support
 274          * ATM ARP [c.f. if_ether.c]).
 275          */
 276
 277         sdl = SDL(rt->rt_gateway);
 278
 279         /*
 280          * Check the address family and length is valid, the address
 281          * is resolved; otherwise, try to resolve.
 282          */
 283
 284
 285         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 286                 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 287                 return(1);      /* ok, go for it! */
 288         }
 289
 290         /*
 291          * we got an entry, but it doesn't have valid link address
 292          * info in it (it is prob. the interface route, which has
 293          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 294          */
 295
 296 bad:
 297         m_freem(m);
 298         return(0);
 299 }
 300 #endif /* INET */