bsd/net/if_ethersubr.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 /*
  31  * Copyright (c) 1982, 1989, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
  63  * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.17 2001/08/01 00:47:49 fenner Exp $
  64  */
  65
  66 #include <sys/param.h>
  67 #include <sys/systm.h>
  68 #include <sys/kernel.h>
  69 #include <sys/malloc.h>
  70 #include <sys/mbuf.h>
  71 #include <sys/socket.h>
  72 #include <sys/sockio.h>
  73 #include <sys/sysctl.h>
  74
  75 #include <net/if.h>
  76 #include <net/route.h>
  77 #include <net/if_llc.h>
  78 #include <net/if_dl.h>
  79 #include <net/if_types.h>
  80
  81 #if INET || INET6
  82 #include <netinet/in.h>
  83 #include <netinet/in_var.h>
  84 #include <netinet/if_ether.h>
  85 #include <netinet/in_systm.h>
  86 #include <netinet/ip.h>
  87 #endif
  88
  89 #if IPX
  90 #include <netipx/ipx.h>
  91 #include <netipx/ipx_if.h>
  92 #endif
  93
  94 #include <sys/socketvar.h>
  95
  96 #if LLC && CCITT
  97 extern struct ifqueue pkintrq;
  98 #endif
  99
 100 #if BRIDGE
 101 #include <net/bridge.h>
 102 #endif
 103
 104 /* #include "vlan.h" */
 105 #if NVLAN > 0
 106 #include <net/if_vlan_var.h>
 107 #endif /* NVLAN > 0 */
 108
 109 extern u_char   etherbroadcastaddr[];
 110 #define senderr(e) do { error = (e); goto bad;} while (0)
 111
 112 /*
 113  * Perform common duties while attaching to interface list
 114  */
 115
 116 int
 117 ether_resolvemulti(
 118         struct ifnet *ifp,
 119         struct sockaddr **llsa,
 120         struct sockaddr *sa)
 121 {
 122         struct sockaddr_dl *sdl;
 123         struct sockaddr_in *sin;
 124         u_char *e_addr;
 125 #if INET6
 126         struct sockaddr_in6 *sin6;
 127 #endif
 128
 129
 130         switch(sa->sa_family) {
 131         case AF_UNSPEC:
 132                 /* AppleTalk uses AF_UNSPEC for multicast registration.
 133                  * No mapping needed. Just check that it's a valid MC address.
 134                  */
 135                 e_addr = &sa->sa_data[0];
 136                 if ((e_addr[0] & 1) != 1)
 137                         return EADDRNOTAVAIL;
 138                 *llsa = 0;
 139                 return 0;
 140
 141         case AF_LINK:
 142                 /*
 143                  * No mapping needed. Just check that it's a valid MC address.
 144                  */
 145                 sdl = (struct sockaddr_dl *)sa;
 146                 e_addr = LLADDR(sdl);
 147                 if ((e_addr[0] & 1) != 1)
 148                         return EADDRNOTAVAIL;
 149                 *llsa = 0;
 150                 return 0;
 151
 152 #if INET
 153         case AF_INET:
 154                 sin = (struct sockaddr_in *)sa;
 155                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 156                         return EADDRNOTAVAIL;
 157                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 158                        M_WAITOK);
 159                 sdl->sdl_len = sizeof *sdl;
 160                 sdl->sdl_family = AF_LINK;
 161                 sdl->sdl_index = ifp->if_index;
 162                 sdl->sdl_type = IFT_ETHER;
 163                 sdl->sdl_nlen = 0;
 164                 sdl->sdl_alen = ETHER_ADDR_LEN;
 165                 sdl->sdl_slen = 0;
 166                 e_addr = LLADDR(sdl);
 167                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 168                 *llsa = (struct sockaddr *)sdl;
 169                 return 0;
 170 #endif
 171 #if INET6
 172         case AF_INET6:
 173                 sin6 = (struct sockaddr_in6 *)sa;
 174                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 175                         /*
 176                          * An IP6 address of 0 means listen to all
 177                          * of the Ethernet multicast address used for IP6.
 178                          * (This is used for multicast routers.)
 179                          */
 180                         ifp->if_flags |= IFF_ALLMULTI;
 181                         *llsa = 0;
 182                         return 0;
 183                 }
 184                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 185                        M_WAITOK);
 186                 sdl->sdl_len = sizeof *sdl;
 187                 sdl->sdl_family = AF_LINK;
 188                 sdl->sdl_index = ifp->if_index;
 189                 sdl->sdl_type = IFT_ETHER;
 190                 sdl->sdl_nlen = 0;
 191                 sdl->sdl_alen = ETHER_ADDR_LEN;
 192                 sdl->sdl_slen = 0;
 193                 e_addr = LLADDR(sdl);
 194                 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
 195                 kprintf("ether_resolvemulti Adding %x:%x:%x:%x:%x:%x\n",
 196                                 e_addr[0], e_addr[1], e_addr[2], e_addr[3], e_addr[4], e_addr[5]);
 197                 *llsa = (struct sockaddr *)sdl;
 198                 return 0;
 199 #endif
 200
 201         default:
 202                 /*
 203                  * Well, the text isn't quite right, but it's the name
 204                  * that counts...
 205                  */
 206                 return EAFNOSUPPORT;
 207         }
 208 }
 209
 210
 211 /*
 212  * Convert Ethernet address to printable (loggable) representation.
 213  */
 214 static u_char digits[] = "0123456789abcdef";
 215 char *
 216 ether_sprintf(p, ap)
 217         register u_char *p;
 218         register u_char *ap;
 219 {       register char *cp;
 220         register i;
 221
 222         for (cp = p, i = 0; i < 6; i++) {
 223                 *cp++ = digits[*ap >> 4];
 224                 *cp++ = digits[*ap++ & 0xf];
 225                 *cp++ = ':';
 226         }
 227         *--cp = 0;
 228         return (p);
 229 }