bsd/net/if_ethersubr.c

   1 /*
   2  * Copyright (c) 2000, 2009 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 /*
  29  * Copyright (c) 1982, 1989, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
  61  * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.17 2001/08/01 00:47:49 fenner Exp $
  62  */
  63
  64 #include <sys/param.h>
  65 #include <sys/systm.h>
  66 #include <sys/kernel.h>
  67 #include <sys/malloc.h>
  68 #include <sys/mbuf.h>
  69 #include <sys/socket.h>
  70 #include <sys/sockio.h>
  71 #include <sys/sysctl.h>
  72
  73 #include <net/if.h>
  74 #include <net/route.h>
  75 #include <net/if_llc.h>
  76 #include <net/if_dl.h>
  77 #include <net/if_types.h>
  78
  79 #if INET || INET6
  80 #include <netinet/in.h>
  81 #include <netinet/in_var.h>
  82 #include <netinet/if_ether.h>
  83 #include <netinet/in_systm.h>
  84 #include <netinet/ip.h>
  85 #endif
  86
  87 #if IPX
  88 #include <netipx/ipx.h>
  89 #include <netipx/ipx_if.h>
  90 #endif
  91
  92 #include <sys/socketvar.h>
  93
  94 #if LLC && CCITT
  95 extern struct ifqueue pkintrq;
  96 #endif
  97
  98 /* #include "vlan.h" */
  99 #if NVLAN > 0
 100 #include <net/if_vlan_var.h>
 101 #endif /* NVLAN > 0 */
 102
 103 extern u_char   etherbroadcastaddr[];
 104 #define senderr(e) do { error = (e); goto bad;} while (0)
 105
 106 /*
 107  * Perform common duties while attaching to interface list
 108  */
 109
 110 int
 111 ether_resolvemulti(
 112         struct ifnet *ifp,
 113         struct sockaddr **llsa,
 114         struct sockaddr *sa)
 115 {
 116         struct sockaddr_dl *sdl;
 117         struct sockaddr_in *sin;
 118         u_char *e_addr;
 119 #if INET6
 120         struct sockaddr_in6 *sin6;
 121 #endif
 122
 123
 124         switch(sa->sa_family) {
 125         case AF_UNSPEC:
 126                 /* AppleTalk uses AF_UNSPEC for multicast registration.
 127                  * No mapping needed. Just check that it's a valid MC address.
 128                  */
 129                 e_addr = &sa->sa_data[0];
 130                 if ((e_addr[0] & 1) != 1)
 131                         return EADDRNOTAVAIL;
 132                 *llsa = 0;
 133                 return 0;
 134
 135         case AF_LINK:
 136                 /*
 137                  * No mapping needed. Just check that it's a valid MC address.
 138                  */
 139                 sdl = (struct sockaddr_dl *)sa;
 140                 e_addr = LLADDR(sdl);
 141                 if ((e_addr[0] & 1) != 1)
 142                         return EADDRNOTAVAIL;
 143                 *llsa = 0;
 144                 return 0;
 145
 146 #if INET
 147         case AF_INET:
 148                 sin = (struct sockaddr_in *)sa;
 149                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 150                         return EADDRNOTAVAIL;
 151                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 152                        M_WAITOK);
 153                 if (sdl == NULL)
 154                         return ENOBUFS;
 155                 sdl->sdl_len = sizeof *sdl;
 156                 sdl->sdl_family = AF_LINK;
 157                 sdl->sdl_index = ifp->if_index;
 158                 sdl->sdl_type = IFT_ETHER;
 159                 sdl->sdl_nlen = 0;
 160                 sdl->sdl_alen = ETHER_ADDR_LEN;
 161                 sdl->sdl_slen = 0;
 162                 e_addr = LLADDR(sdl);
 163                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 164                 *llsa = (struct sockaddr *)sdl;
 165                 return 0;
 166 #endif
 167 #if INET6
 168         case AF_INET6:
 169                 sin6 = (struct sockaddr_in6 *)sa;
 170                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 171                         /*
 172                          * An IP6 address of 0 means listen to all
 173                          * of the Ethernet multicast address used for IP6.
 174                          * (This is used for multicast routers.)
 175                          */
 176                         ifp->if_flags |= IFF_ALLMULTI;
 177                         *llsa = 0;
 178                         return 0;
 179                 }
 180                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 181                        M_WAITOK);
 182                 if (sdl == NULL)
 183                         return ENOBUFS;
 184                 sdl->sdl_len = sizeof *sdl;
 185                 sdl->sdl_family = AF_LINK;
 186                 sdl->sdl_index = ifp->if_index;
 187                 sdl->sdl_type = IFT_ETHER;
 188                 sdl->sdl_nlen = 0;
 189                 sdl->sdl_alen = ETHER_ADDR_LEN;
 190                 sdl->sdl_slen = 0;
 191                 e_addr = LLADDR(sdl);
 192                 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
 193 #if 0
 194                 printf("ether_resolvemulti Adding %x:%x:%x:%x:%x:%x\n",
 195                                 e_addr[0], e_addr[1], e_addr[2], e_addr[3], e_addr[4], e_addr[5]);
 196 #endif
 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 }