bsd/net/ether_inet6_pr_module.c

   1 /*
   2  * Copyright (c) 2000-2013 Apple 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  */
  61
  62 #include <sys/param.h>
  63 #include <sys/systm.h>
  64 #include <sys/kernel.h>
  65 #include <sys/malloc.h>
  66 #include <sys/mbuf.h>
  67 #include <sys/socket.h>
  68 #include <sys/sockio.h>
  69 #include <sys/sysctl.h>
  70 #include <sys/socketvar.h>
  71
  72 #include <net/dlil.h>
  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 #include <net/ndrv.h>
  79 #include <net/kpi_protocol.h>
  80 #include <net/dlil.h>
  81
  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
  88 #if INET6
  89 #include <netinet6/nd6.h>
  90 #include <netinet6/in6_ifattach.h>
  91 #include <netinet6/ip6_var.h>
  92 #endif
  93
  94 /* #include "vlan.h" */
  95 #if NVLAN > 0
  96 #include <net/if_vlan_var.h>
  97 #endif /* NVLAN > 0 */
  98
  99 #include <net/ether_if_module.h>
 100
 101 static const u_char etherip6allnodes[ETHER_ADDR_LEN] =
 102         { 0x33, 0x33, 0, 0, 0, 1 };
 103
 104 /*
 105  * Process a received Ethernet packet;
 106  * the packet is in the mbuf chain m without
 107  * the ether header, which is provided separately.
 108  */
 109 static errno_t
 110 ether_inet6_input(ifnet_t ifp, protocol_family_t protocol,
 111     mbuf_t packet, char *header)
 112 {
 113 #pragma unused(ifp, protocol)
 114         struct ether_header *eh = (struct ether_header *)(void *)header;
 115         u_int16_t ether_type;
 116
 117         bcopy(&eh->ether_type, &ether_type, sizeof (ether_type));
 118
 119         if (ether_type == htons(ETHERTYPE_IPV6)) {
 120                 struct ifnet *mifp;
 121                 /*
 122                  * Trust the ifp in the mbuf, rather than ifproto's
 123                  * since the packet could have been injected via
 124                  * a dlil_input_packet_list() using an ifp that is
 125                  * different than the one where the packet really
 126                  * came from.
 127                  */
 128                 mifp = mbuf_pkthdr_rcvif(packet);
 129
 130                 /* Update L2 reachability record, if present (and not bcast) */
 131                 if (bcmp(eh->ether_shost, etherbroadcastaddr,
 132                     ETHER_ADDR_LEN) != 0) {
 133                         nd6_llreach_set_reachable(mifp, eh->ether_shost,
 134                             ETHER_ADDR_LEN);
 135                 }
 136
 137                 /* Save the Ethernet source address for all-nodes multicasts */
 138                 if (!bcmp(eh->ether_dhost, etherip6allnodes, ETHER_ADDR_LEN)) {
 139                         struct ip6aux *ip6a;
 140
 141                         ip6a = ip6_addaux(packet);
 142                         if (ip6a) {
 143                                 ip6a->ip6a_flags |= IP6A_HASEEN;
 144                                 bcopy(eh->ether_shost, ip6a->ip6a_ehsrc,
 145                                     ETHER_ADDR_LEN);
 146                         }
 147                 }
 148
 149                 if (proto_input(protocol, packet) != 0)
 150                         m_freem(packet);
 151         } else {
 152                 m_freem(packet);
 153         }
 154
 155         return (EJUSTRETURN);
 156 }
 157
 158 static errno_t
 159 ether_inet6_pre_output(ifnet_t ifp, protocol_family_t protocol_family,
 160     mbuf_t *m0, const struct sockaddr *dst_netaddr, void *route,
 161     char *type, char *edst)
 162 {
 163 #pragma unused(protocol_family)
 164         errno_t result;
 165         struct sockaddr_dl sdl;
 166         struct mbuf *m = *m0;
 167
 168         /*
 169          * Tell ether_frameout it's ok to loop packet if necessary
 170          */
 171         m->m_flags |= M_LOOP;
 172
 173         result = nd6_lookup_ipv6(ifp, (const struct sockaddr_in6 *)
 174             (uintptr_t)(size_t)dst_netaddr, &sdl, sizeof (sdl), route, *m0);
 175
 176         if (result == 0) {
 177                 u_int16_t ethertype_ipv6 = htons(ETHERTYPE_IPV6);
 178
 179                 bcopy(&ethertype_ipv6, type, sizeof (ethertype_ipv6));
 180                 bcopy(LLADDR(&sdl), edst, sdl.sdl_alen);
 181         }
 182
 183         return (result);
 184 }
 185
 186 static int
 187 ether_inet6_resolve_multi(ifnet_t ifp, const struct sockaddr *proto_addr,
 188     struct sockaddr_dl *out_ll, size_t ll_len)
 189 {
 190         static const size_t minsize =
 191             offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
 192         const struct sockaddr_in6 *sin6 =
 193             (const struct sockaddr_in6 *)(uintptr_t)(size_t)proto_addr;
 194
 195         if (proto_addr->sa_family != AF_INET6)
 196                 return (EAFNOSUPPORT);
 197
 198         if (proto_addr->sa_len < sizeof (struct sockaddr_in6))
 199                 return (EINVAL);
 200
 201         if (ll_len < minsize)
 202                 return (EMSGSIZE);
 203
 204         bzero(out_ll, minsize);
 205         out_ll->sdl_len = minsize;
 206         out_ll->sdl_family = AF_LINK;
 207         out_ll->sdl_index = ifp->if_index;
 208         out_ll->sdl_type = IFT_ETHER;
 209         out_ll->sdl_nlen = 0;
 210         out_ll->sdl_alen = ETHER_ADDR_LEN;
 211         out_ll->sdl_slen = 0;
 212         ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, LLADDR(out_ll));
 213
 214         return (0);
 215 }
 216
 217 static errno_t
 218 ether_inet6_prmod_ioctl(ifnet_t ifp, protocol_family_t protocol_family,
 219     u_long command, void *data)
 220 {
 221 #pragma unused(protocol_family)
 222         int error = 0;
 223
 224         switch (command) {
 225         case SIOCSIFADDR:               /* struct ifaddr pointer */
 226                 /*
 227                  * Note: caller of ifnet_ioctl() passes in pointer to
 228                  * struct ifaddr as parameter to SIOCSIFADDR, for legacy
 229                  * reasons.
 230                  */
 231                 if ((ifp->if_flags & IFF_RUNNING) == 0) {
 232                         ifnet_set_flags(ifp, IFF_UP, IFF_UP);
 233                         ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
 234                 }
 235                 break;
 236
 237         case SIOCGIFADDR: {             /* struct ifreq */
 238                 struct ifreq *ifr = (struct ifreq *)(void *)data;
 239                 (void) ifnet_guarded_lladdr_copy_bytes(ifp,
 240                     ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
 241                 break;
 242         }
 243
 244         default:
 245                 error = EOPNOTSUPP;
 246                 break;
 247         }
 248         return (error);
 249 }
 250
 251 errno_t
 252 ether_attach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
 253 {
 254 #pragma unused(protocol_family)
 255         struct ifnet_attach_proto_param proto;
 256         struct ifnet_demux_desc demux[1];
 257         u_short en_6native = htons(ETHERTYPE_IPV6);
 258         errno_t error;
 259
 260         bzero(&proto, sizeof (proto));
 261         demux[0].type = DLIL_DESC_ETYPE2;
 262         demux[0].data = &en_6native;
 263         demux[0].datalen = sizeof (en_6native);
 264         proto.demux_list = demux;
 265         proto.demux_count = 1;
 266         proto.input = ether_inet6_input;
 267         proto.pre_output = ether_inet6_pre_output;
 268         proto.ioctl = ether_inet6_prmod_ioctl;
 269         proto.resolve = ether_inet6_resolve_multi;
 270         error = ifnet_attach_protocol(ifp, protocol_family, &proto);
 271         if (error && error != EEXIST) {
 272                 printf("WARNING: %s can't attach ipv6 to %s\n", __func__,
 273                     if_name(ifp));
 274         }
 275
 276         return (error);
 277 }
 278
 279 void
 280 ether_detach_inet6(struct ifnet *ifp, protocol_family_t protocol_family)
 281 {
 282         (void) ifnet_detach_protocol(ifp, protocol_family);
 283 }