bsd/netinet/if_atm.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
  26
  27 /*
  28  *
  29  * Copyright (c) 1996 Charles D. Cranor and Washington University.
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by Charles D. Cranor and
  43  *      Washington University.
  44  * 4. The name of the author may not be used to endorse or promote products
  45  *    derived from this software without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  48  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  49  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  50  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  51  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  52  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  53  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  54  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  55  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  56  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  57  *
  58  * $FreeBSD: src/sys/netinet/if_atm.c,v 1.8 1999/12/07 17:39:06 shin Exp $
  59  */
  60
  61 /*
  62  * IP <=> ATM address resolution.
  63  */
  64
  65 #if defined(INET) || defined(INET6)
  66
  67 #include <sys/param.h>
  68 #include <sys/systm.h>
  69 #include <sys/queue.h>
  70 #include <sys/mbuf.h>
  71 #include <sys/socket.h>
  72 #include <sys/sockio.h>
  73 #include <sys/syslog.h>
  74
  75 #include <net/if.h>
  76 #include <net/if_dl.h>
  77 #include <net/route.h>
  78 #include <net/if_atm.h>
  79
  80 #include <netinet/in.h>
  81 #include <netinet/if_atm.h>
  82 #include <net/dlil.h>
  83
  84
  85 #if NATM
  86 #include <netnatm/natm.h>
  87 #endif
  88
  89
  90 #define SDL(s) ((struct sockaddr_dl *)s)
  91
  92 /*
  93  * atm_rtrequest: handle ATM rt request (in support of generic code)
  94  *   inputs: "req" = request code
  95  *           "rt" = route entry
  96  *           "sa" = sockaddr
  97  */
  98
  99 void
 100 atm_rtrequest(req, rt, sa)
 101         int req;
 102         register struct rtentry *rt;
 103         struct sockaddr *sa;
 104 {
 105         register struct sockaddr *gate = rt->rt_gateway;
 106         struct atm_pseudoioctl api;
 107 #if NATM
 108         struct sockaddr_in *sin;
 109         struct natmpcb *npcb = NULL;
 110         struct atm_pseudohdr *aph;
 111 #endif
 112         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 113
 114         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
 115                 return;
 116
 117         switch (req) {
 118
 119         case RTM_RESOLVE: /* resolve: only happens when cloning */
 120                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
 121                 break;
 122
 123         case RTM_ADD:
 124
 125                 /*
 126                  * route added by a command (e.g. ifconfig, route, arp...).
 127                  *
 128                  * first check to see if this is not a host route, in which
 129                  * case we are being called via "ifconfig" to set the address.
 130                  */
 131
 132                 if ((rt->rt_flags & RTF_HOST) == 0) {
 133                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
 134                         gate = rt->rt_gateway;
 135                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 136                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 137                         break;
 138                 }
 139
 140                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 141                         printf("atm_rtrequest: cloning route detected?\n");
 142                         break;
 143                 }
 144                 if (gate->sa_family != AF_LINK ||
 145                     gate->sa_len < sizeof(null_sdl)) {
 146                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 147                         break;
 148                 }
 149
 150 #if DIAGNOSTIC
 151                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 152 #endif
 153
 154 #if NATM
 155                 /*
 156                  * let native ATM know we are using this VCI/VPI
 157                  * (i.e. reserve it)
 158                  */
 159                 sin = (struct sockaddr_in *) rt_key(rt);
 160                 if (sin->sin_family != AF_INET)
 161                         goto failed;
 162                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
 163                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 164                                                 ATM_PH_VPI(aph));
 165                 if (npcb == NULL)
 166                         goto failed;
 167                 npcb->npcb_flags |= NPCB_IP;
 168                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 169                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 170                 rt->rt_llinfo = (caddr_t) npcb;
 171                 rt->rt_flags |= RTF_LLINFO;
 172 #endif
 173                 /*
 174                  * let the lower level know this circuit is active
 175                  */
 176                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 177                 api.rxhand = NULL;
 178                 if (dlil_ioctl(0, rt->rt_ifp, SIOCATMENA,
 179                                                         (caddr_t)&api) != 0) {
 180                         printf("atm: couldn't add VC\n");
 181                         goto failed;
 182                 }
 183
 184                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 185                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 186
 187                 break;
 188
 189 failed:
 190 #if NATM
 191                 if (npcb) {
 192                         npcb_free(npcb, NPCB_DESTROY);
 193                         rt->rt_llinfo = NULL;
 194                         rt->rt_flags &= ~RTF_LLINFO;
 195                 }
 196 #endif
 197                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
 198                         rt_mask(rt), 0, (struct rtentry **) 0);
 199                 break;
 200
 201         case RTM_DELETE:
 202
 203 #if NATM
 204                 /*
 205                  * tell native ATM we are done with this VC
 206                  */
 207
 208                 if (rt->rt_flags & RTF_LLINFO) {
 209                         npcb_free((struct natmpcb *)rt->rt_llinfo,
 210                                                                 NPCB_DESTROY);
 211                         rt->rt_llinfo = NULL;
 212                         rt->rt_flags &= ~RTF_LLINFO;
 213                 }
 214 #endif
 215                 /*
 216                  * tell the lower layer to disable this circuit
 217                  */
 218
 219                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 220                 api.rxhand = NULL;
 221                 dlil_ioctl(0, rt->rt_ifp, SIOCATMDIS,
 222                                                         (caddr_t)&api);
 223
 224                 break;
 225         }
 226 }
 227
 228 /*
 229  * atmresolve:
 230  *   inputs:
 231  *     [1] "rt" = the link level route to use (or null if need to look one up)
 232  *     [2] "m" = mbuf containing the data to be sent
 233  *     [3] "dst" = sockaddr_in (IP) address of dest.
 234  *   output:
 235  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 236  *   return:
 237  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 238  *     1 == resolve OK; desten contains result
 239  *
 240  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 241  *   but this is enough for PVCs entered via the "route" command.
 242  */
 243
 244 int
 245 atmresolve(rt, m, dst, desten)
 246
 247 register struct rtentry *rt;
 248 struct mbuf *m;
 249 register struct sockaddr *dst;
 250 register struct atm_pseudohdr *desten;  /* OUT */
 251
 252 {
 253         struct sockaddr_dl *sdl;
 254
 255         if (m->m_flags & (M_BCAST|M_MCAST)) {
 256                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 257                 goto bad;
 258         }
 259
 260         if (rt == NULL) {
 261                 rt = RTALLOC1(dst, 0);
 262                 if (rt == NULL) goto bad; /* failed */
 263                 rtunref(rt);    /* don't keep LL references */
 264                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 265                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 266                         /* XXX: are we using LLINFO? */
 267                         rt->rt_gateway->sa_family != AF_LINK) {
 268                                 goto bad;
 269                 }
 270         }
 271
 272         /*
 273          * note that rt_gateway is a sockaddr_dl which contains the
 274          * atm_pseudohdr data structure for this route.   we currently
 275          * don't need any rt_llinfo info (but will if we want to support
 276          * ATM ARP [c.f. if_ether.c]).
 277          */
 278
 279         sdl = SDL(rt->rt_gateway);
 280
 281         /*
 282          * Check the address family and length is valid, the address
 283          * is resolved; otherwise, try to resolve.
 284          */
 285
 286
 287         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 288                 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 289                 return(1);      /* ok, go for it! */
 290         }
 291
 292         /*
 293          * we got an entry, but it doesn't have valid link address
 294          * info in it (it is prob. the interface route, which has
 295          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 296          */
 297
 298 bad:
 299         m_freem(m);
 300         return(0);
 301 }
 302 #endif /* INET */