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