bsd/netinet/if_atm.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
  31
  32 /*
  33  *
  34  * Copyright (c) 1996 Charles D. Cranor and Washington University.
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by Charles D. Cranor and
  48  *      Washington University.
  49  * 4. The name of the author may not be used to endorse or promote products
  50  *    derived from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  53  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  54  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  55  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  56  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  57  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  61  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  * $FreeBSD: src/sys/netinet/if_atm.c,v 1.8 1999/12/07 17:39:06 shin Exp $
  64  */
  65
  66 /*
  67  * IP <=> ATM address resolution.
  68  */
  69
  70 #if defined(INET) || defined(INET6)
  71
  72 #include <sys/param.h>
  73 #include <sys/systm.h>
  74 #include <sys/queue.h>
  75 #include <sys/mbuf.h>
  76 #include <sys/socket.h>
  77 #include <sys/sockio.h>
  78 #include <sys/syslog.h>
  79
  80 #include <net/if.h>
  81 #include <net/if_dl.h>
  82 #include <net/route.h>
  83 #include <net/if_atm.h>
  84
  85 #include <netinet/in.h>
  86 #include <netinet/if_atm.h>
  87 #include <net/dlil.h>
  88
  89
  90 #if NATM
  91 #include <netnatm/natm.h>
  92 #endif
  93
  94
  95 #define SDL(s) ((struct sockaddr_dl *)s)
  96
  97 /*
  98  * atm_rtrequest: handle ATM rt request (in support of generic code)
  99  *   inputs: "req" = request code
 100  *           "rt" = route entry
 101  *           "sa" = sockaddr
 102  */
 103
 104 void
 105 atm_rtrequest(req, rt, sa)
 106         int req;
 107         register struct rtentry *rt;
 108         struct sockaddr *sa;
 109 {
 110         register struct sockaddr *gate = rt->rt_gateway;
 111         struct atm_pseudoioctl api;
 112 #if NATM
 113         struct sockaddr_in *sin;
 114         struct natmpcb *npcb = NULL;
 115         struct atm_pseudohdr *aph;
 116 #endif
 117         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
 118
 119         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
 120                 return;
 121
 122         switch (req) {
 123
 124         case RTM_RESOLVE: /* resolve: only happens when cloning */
 125                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
 126                 break;
 127
 128         case RTM_ADD:
 129
 130                 /*
 131                  * route added by a command (e.g. ifconfig, route, arp...).
 132                  *
 133                  * first check to see if this is not a host route, in which
 134                  * case we are being called via "ifconfig" to set the address.
 135                  */
 136
 137                 if ((rt->rt_flags & RTF_HOST) == 0) {
 138                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
 139                         gate = rt->rt_gateway;
 140                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 141                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 142                         break;
 143                 }
 144
 145                 if ((rt->rt_flags & RTF_CLONING) != 0) {
 146                         printf("atm_rtrequest: cloning route detected?\n");
 147                         break;
 148                 }
 149                 if (gate->sa_family != AF_LINK ||
 150                     gate->sa_len < sizeof(null_sdl)) {
 151                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
 152                         break;
 153                 }
 154
 155 #if DIAGNOSTIC
 156                 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
 157 #endif
 158
 159 #if NATM
 160                 /*
 161                  * let native ATM know we are using this VCI/VPI
 162                  * (i.e. reserve it)
 163                  */
 164                 sin = (struct sockaddr_in *) rt_key(rt);
 165                 if (sin->sin_family != AF_INET)
 166                         goto failed;
 167                 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
 168                 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
 169                                                 ATM_PH_VPI(aph));
 170                 if (npcb == NULL)
 171                         goto failed;
 172                 npcb->npcb_flags |= NPCB_IP;
 173                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
 174                 /* XXX: move npcb to llinfo when ATM ARP is ready */
 175                 rt->rt_llinfo = (caddr_t) npcb;
 176                 rt->rt_flags |= RTF_LLINFO;
 177 #endif
 178                 /*
 179                  * let the lower level know this circuit is active
 180                  */
 181                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 182                 api.rxhand = NULL;
 183                 if (dlil_ioctl(0, rt->rt_ifp, SIOCATMENA,
 184                                                         (caddr_t)&api) != 0) {
 185                         printf("atm: couldn't add VC\n");
 186                         goto failed;
 187                 }
 188
 189                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
 190                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
 191
 192                 break;
 193
 194 failed:
 195 #if NATM
 196                 if (npcb) {
 197                         npcb_free(npcb, NPCB_DESTROY);
 198                         rt->rt_llinfo = NULL;
 199                         rt->rt_flags &= ~RTF_LLINFO;
 200                 }
 201 #endif
 202                 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
 203                         rt_mask(rt), 0, (struct rtentry **) 0);
 204                 break;
 205
 206         case RTM_DELETE:
 207
 208 #if NATM
 209                 /*
 210                  * tell native ATM we are done with this VC
 211                  */
 212
 213                 if (rt->rt_flags & RTF_LLINFO) {
 214                         npcb_free((struct natmpcb *)rt->rt_llinfo,
 215                                                                 NPCB_DESTROY);
 216                         rt->rt_llinfo = NULL;
 217                         rt->rt_flags &= ~RTF_LLINFO;
 218                 }
 219 #endif
 220                 /*
 221                  * tell the lower layer to disable this circuit
 222                  */
 223
 224                 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
 225                 api.rxhand = NULL;
 226                 dlil_ioctl(0, rt->rt_ifp, SIOCATMDIS,
 227                                                         (caddr_t)&api);
 228
 229                 break;
 230         }
 231 }
 232
 233 /*
 234  * atmresolve:
 235  *   inputs:
 236  *     [1] "rt" = the link level route to use (or null if need to look one up)
 237  *     [2] "m" = mbuf containing the data to be sent
 238  *     [3] "dst" = sockaddr_in (IP) address of dest.
 239  *   output:
 240  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
 241  *   return:
 242  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
 243  *     1 == resolve OK; desten contains result
 244  *
 245  *   XXX: will need more work if we wish to support ATMARP in the kernel,
 246  *   but this is enough for PVCs entered via the "route" command.
 247  */
 248
 249 int
 250 atmresolve(rt, m, dst, desten)
 251
 252 register struct rtentry *rt;
 253 struct mbuf *m;
 254 register struct sockaddr *dst;
 255 register struct atm_pseudohdr *desten;  /* OUT */
 256
 257 {
 258         struct sockaddr_dl *sdl;
 259
 260         if (m->m_flags & (M_BCAST|M_MCAST)) {
 261                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
 262                 goto bad;
 263         }
 264
 265         if (rt == NULL) {
 266                 rt = RTALLOC1(dst, 0);
 267                 if (rt == NULL) goto bad; /* failed */
 268                 rtunref(rt);    /* don't keep LL references */
 269                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
 270                         (rt->rt_flags & RTF_LLINFO) == 0 ||
 271                         /* XXX: are we using LLINFO? */
 272                         rt->rt_gateway->sa_family != AF_LINK) {
 273                                 goto bad;
 274                 }
 275         }
 276
 277         /*
 278          * note that rt_gateway is a sockaddr_dl which contains the
 279          * atm_pseudohdr data structure for this route.   we currently
 280          * don't need any rt_llinfo info (but will if we want to support
 281          * ATM ARP [c.f. if_ether.c]).
 282          */
 283
 284         sdl = SDL(rt->rt_gateway);
 285
 286         /*
 287          * Check the address family and length is valid, the address
 288          * is resolved; otherwise, try to resolve.
 289          */
 290
 291
 292         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
 293                 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
 294                 return(1);      /* ok, go for it! */
 295         }
 296
 297         /*
 298          * we got an entry, but it doesn't have valid link address
 299          * info in it (it is prob. the interface route, which has
 300          * sdl_alen == 0).    dump packet.  (fall through to "bad").
 301          */
 302
 303 bad:
 304         m_freem(m);
 305         return(0);
 306 }
 307 #endif /* INET */