bsd/netinet/if_atm.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
  29
  30 /*
  31  *
  32  * Copyright (c) 1996 Charles D. Cranor and Washington University.
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  * 3. All advertising materials mentioning features or use of this software
  44  *    must display the following acknowledgement:
  45  *      This product includes software developed by Charles D. Cranor and
  46  *      Washington University.
  47  * 4. The name of the author may not be used to endorse or promote products
  48  *    derived from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  51  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  52  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  53  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  54  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  55  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  59  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *
  61  * $FreeBSD: src/sys/netinet/if_atm.c,v 1.8 1999/12/07 17:39:06 shin Exp $
  62  */
  63
  64 /*
  65  * IP <=> ATM address resolution.
  66  */
  67
  68 #if defined(INET) || defined(INET6)
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/queue.h>
  73 #include <sys/mbuf.h>
  74 #include <sys/socket.h>
  75 #include <sys/sockio.h>
  76 #include <sys/syslog.h>
  77
  78 #include <net/if.h>
  79 #include <net/if_dl.h>
  80 #include <net/route.h>
  81 #include <net/if_atm.h>
  82
  83 #include <netinet/in.h>
  84 #include <netinet/if_atm.h>
  85 #include <net/dlil.h>
  86
  87
  88 #if NATM
  89 #include <netnatm/natm.h>
  90 #endif
  91
  92
  93 #define SDL(s) ((struct sockaddr_dl *)s)
  94
  95 /*
  96  * atm_rtrequest: handle ATM rt request (in support of generic code)
  97  *   inputs: "req" = request code
  98  *           "rt" = route entry
  99  *           "sa" = sockaddr
 100  */
 101
 102 void
 103 atm_rtrequest(req, rt, sa)
 104         int req;
 105         register struct rtentry *rt;
 106         struct sockaddr *sa;
 107 {
 108         register struct sockaddr *gate = rt->rt_gateway;
 109         struct atm_pseudoioctl api;
 110 #if NATM
 111         struct sockaddr_in *sin;
 112         struct natmpcb *npcb = NULL;
 113         struct atm_pseudohdr *aph;
 114 #endif
 115         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 116
 117         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
 118                 return;
 119
 120         switch (req) {
 121
 122         case RTM_RESOLVE: /* resolve: only happens when cloning */
 123                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
 124                 break;
 125
 126         case RTM_ADD:
 127
 128                 /*
 129                  * route added by a command (e.g. ifconfig, route, arp...).
 130                  *
 131                  * first check to see if this is not a host route, in which
 132                  * case we are being called via "ifconfig" to set the address.
 133                  */
 134
 135                 if ((rt->rt_flags & RTF_HOST) == 0) {
 136                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
 137                         gate = rt->rt_gateway;
 138                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 139                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 140                         break;
 141                 }
 142
 143                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 144                         printf("atm_rtrequest: cloning route detected?\n");
 145                         break;
 146                 }
 147                 if (gate->sa_family != AF_LINK ||
 148                     gate->sa_len < sizeof(null_sdl)) {
 149                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 150                         break;
 151                 }
 152
 153 #if DIAGNOSTIC
 154                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 155 #endif
 156
 157 #if NATM
 158                 /*
 159                  * let native ATM know we are using this VCI/VPI
 160                  * (i.e. reserve it)
 161                  */
 162                 sin = (struct sockaddr_in *) rt_key(rt);
 163                 if (sin->sin_family != AF_INET)
 164                         goto failed;
 165                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
 166                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 167                                                 ATM_PH_VPI(aph));
 168                 if (npcb == NULL)
 169                         goto failed;
 170                 npcb->npcb_flags |= NPCB_IP;
 171                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 172                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 173                 rt->rt_llinfo = (caddr_t) npcb;
 174                 rt->rt_flags |= RTF_LLINFO;
 175 #endif
 176                 /*
 177                  * let the lower level know this circuit is active
 178                  */
 179                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 180                 api.rxhand = NULL;
 181                 if (dlil_ioctl(0, rt->rt_ifp, SIOCATMENA,
 182                                                         (caddr_t)&api) != 0) {
 183                         printf("atm: couldn't add VC\n");
 184                         goto failed;
 185                 }
 186
 187                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 188                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 189
 190                 break;
 191
 192 failed:
 193 #if NATM
 194                 if (npcb) {
 195                         npcb_free(npcb, NPCB_DESTROY);
 196                         rt->rt_llinfo = NULL;
 197                         rt->rt_flags &= ~RTF_LLINFO;
 198                 }
 199 #endif
 200                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
 201                         rt_mask(rt), 0, (struct rtentry **) 0);
 202                 break;
 203
 204         case RTM_DELETE:
 205
 206 #if NATM
 207                 /*
 208                  * tell native ATM we are done with this VC
 209                  */
 210
 211                 if (rt->rt_flags & RTF_LLINFO) {
 212                         npcb_free((struct natmpcb *)rt->rt_llinfo,
 213                                                                 NPCB_DESTROY);
 214                         rt->rt_llinfo = NULL;
 215                         rt->rt_flags &= ~RTF_LLINFO;
 216                 }
 217 #endif
 218                 /*
 219                  * tell the lower layer to disable this circuit
 220                  */
 221
 222                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 223                 api.rxhand = NULL;
 224                 dlil_ioctl(0, rt->rt_ifp, SIOCATMDIS,
 225                                                         (caddr_t)&api);
 226
 227                 break;
 228         }
 229 }
 230
 231 /*
 232  * atmresolve:
 233  *   inputs:
 234  *     [1] "rt" = the link level route to use (or null if need to look one up)
 235  *     [2] "m" = mbuf containing the data to be sent
 236  *     [3] "dst" = sockaddr_in (IP) address of dest.
 237  *   output:
 238  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 239  *   return:
 240  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 241  *     1 == resolve OK; desten contains result
 242  *
 243  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 244  *   but this is enough for PVCs entered via the "route" command.
 245  */
 246
 247 int
 248 atmresolve(rt, m, dst, desten)
 249
 250 register struct rtentry *rt;
 251 struct mbuf *m;
 252 register struct sockaddr *dst;
 253 register struct atm_pseudohdr *desten;  /* OUT */
 254
 255 {
 256         struct sockaddr_dl *sdl;
 257
 258         if (m->m_flags & (M_BCAST|M_MCAST)) {
 259                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 260                 goto bad;
 261         }
 262
 263         if (rt == NULL) {
 264                 rt = RTALLOC1(dst, 0);
 265                 if (rt == NULL) goto bad; /* failed */
 266                 rtunref(rt);    /* don't keep LL references */
 267                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 268                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 269                         /* XXX: are we using LLINFO? */
 270                         rt->rt_gateway->sa_family != AF_LINK) {
 271                                 goto bad;
 272                 }
 273         }
 274
 275         /*
 276          * note that rt_gateway is a sockaddr_dl which contains the
 277          * atm_pseudohdr data structure for this route.   we currently
 278          * don't need any rt_llinfo info (but will if we want to support
 279          * ATM ARP [c.f. if_ether.c]).
 280          */
 281
 282         sdl = SDL(rt->rt_gateway);
 283
 284         /*
 285          * Check the address family and length is valid, the address
 286          * is resolved; otherwise, try to resolve.
 287          */
 288
 289
 290         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 291                 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 292                 return(1);      /* ok, go for it! */
 293         }
 294
 295         /*
 296          * we got an entry, but it doesn't have valid link address
 297          * info in it (it is prob. the interface route, which has
 298          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 299          */
 300
 301 bad:
 302         m_freem(m);
 303         return(0);
 304 }
 305 #endif /* INET */