bsd/net/if_ethersubr.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1982, 1989, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
  56  * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.17 2001/08/01 00:47:49 fenner Exp $
  57  */
  58
  59 #include <sys/param.h>
  60 #include <sys/systm.h>
  61 #include <sys/kernel.h>
  62 #include <sys/malloc.h>
  63 #include <sys/mbuf.h>
  64 #include <sys/socket.h>
  65 #include <sys/sockio.h>
  66 #include <sys/sysctl.h>
  67
  68 #include <net/if.h>
  69 #include <net/route.h>
  70 #include <net/if_llc.h>
  71 #include <net/if_dl.h>
  72 #include <net/if_types.h>
  73
  74 #if INET || INET6
  75 #include <netinet/in.h>
  76 #include <netinet/in_var.h>
  77 #include <netinet/if_ether.h>
  78 #include <netinet/in_systm.h>
  79 #include <netinet/ip.h>
  80 #endif
  81
  82 #if IPX
  83 #include <netipx/ipx.h>
  84 #include <netipx/ipx_if.h>
  85 #endif
  86
  87 #include <sys/socketvar.h>
  88
  89 #if LLC && CCITT
  90 extern struct ifqueue pkintrq;
  91 #endif
  92
  93 #if BRIDGE
  94 #include <net/bridge.h>
  95 #endif
  96
  97 /* #include "vlan.h" */
  98 #if NVLAN > 0
  99 #include <net/if_vlan_var.h>
 100 #endif /* NVLAN > 0 */
 101
 102 extern u_char   etherbroadcastaddr[];
 103 #define senderr(e) do { error = (e); goto bad;} while (0)
 104
 105 /*
 106  * Perform common duties while attaching to interface list
 107  */
 108
 109 int
 110 ether_resolvemulti(
 111         struct ifnet *ifp,
 112         struct sockaddr **llsa,
 113         struct sockaddr *sa)
 114 {
 115         struct sockaddr_dl *sdl;
 116         struct sockaddr_in *sin;
 117         u_char *e_addr;
 118 #if INET6
 119         struct sockaddr_in6 *sin6;
 120 #endif
 121
 122
 123         switch(sa->sa_family) {
 124         case AF_UNSPEC:
 125                 /* AppleTalk uses AF_UNSPEC for multicast registration.
 126                  * No mapping needed. Just check that it's a valid MC address.
 127                  */
 128                 e_addr = &sa->sa_data[0];
 129                 if ((e_addr[0] & 1) != 1)
 130                         return EADDRNOTAVAIL;
 131                 *llsa = 0;
 132                 return 0;
 133
 134         case AF_LINK:
 135                 /*
 136                  * No mapping needed. Just check that it's a valid MC address.
 137                  */
 138                 sdl = (struct sockaddr_dl *)sa;
 139                 e_addr = LLADDR(sdl);
 140                 if ((e_addr[0] & 1) != 1)
 141                         return EADDRNOTAVAIL;
 142                 *llsa = 0;
 143                 return 0;
 144
 145 #if INET
 146         case AF_INET:
 147                 sin = (struct sockaddr_in *)sa;
 148                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 149                         return EADDRNOTAVAIL;
 150                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 151                        M_WAITOK);
 152                 sdl->sdl_len = sizeof *sdl;
 153                 sdl->sdl_family = AF_LINK;
 154                 sdl->sdl_index = ifp->if_index;
 155                 sdl->sdl_type = IFT_ETHER;
 156                 sdl->sdl_nlen = 0;
 157                 sdl->sdl_alen = ETHER_ADDR_LEN;
 158                 sdl->sdl_slen = 0;
 159                 e_addr = LLADDR(sdl);
 160                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 161                 *llsa = (struct sockaddr *)sdl;
 162                 return 0;
 163 #endif
 164 #if INET6
 165         case AF_INET6:
 166                 sin6 = (struct sockaddr_in6 *)sa;
 167                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 168                         /*
 169                          * An IP6 address of 0 means listen to all
 170                          * of the Ethernet multicast address used for IP6.
 171                          * (This is used for multicast routers.)
 172                          */
 173                         ifp->if_flags |= IFF_ALLMULTI;
 174                         *llsa = 0;
 175                         return 0;
 176                 }
 177                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 178                        M_WAITOK);
 179                 sdl->sdl_len = sizeof *sdl;
 180                 sdl->sdl_family = AF_LINK;
 181                 sdl->sdl_index = ifp->if_index;
 182                 sdl->sdl_type = IFT_ETHER;
 183                 sdl->sdl_nlen = 0;
 184                 sdl->sdl_alen = ETHER_ADDR_LEN;
 185                 sdl->sdl_slen = 0;
 186                 e_addr = LLADDR(sdl);
 187                 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
 188                 kprintf("ether_resolvemulti Adding %x:%x:%x:%x:%x:%x\n",
 189                                 e_addr[0], e_addr[1], e_addr[2], e_addr[3], e_addr[4], e_addr[5]);
 190                 *llsa = (struct sockaddr *)sdl;
 191                 return 0;
 192 #endif
 193
 194         default:
 195                 /*
 196                  * Well, the text isn't quite right, but it's the name
 197                  * that counts...
 198                  */
 199                 return EAFNOSUPPORT;
 200         }
 201 }
 202
 203
 204 /*
 205  * Convert Ethernet address to printable (loggable) representation.
 206  */
 207 static u_char digits[] = "0123456789abcdef";
 208 char *
 209 ether_sprintf(p, ap)
 210         register u_char *p;
 211         register u_char *ap;
 212 {       register char *cp;
 213         register i;
 214
 215         for (cp = p, i = 0; i < 6; i++) {
 216                 *cp++ = digits[*ap >> 4];
 217                 *cp++ = digits[*ap++ & 0xf];
 218                 *cp++ = ':';
 219         }
 220         *--cp = 0;
 221         return (p);
 222 }