bsd/net/ether_inet_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  * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
  63  * support for mandatory and extensible security protections.  This notice
  64  * is included in support of clause 2.2 (b) of the Apple Public License,
  65  * Version 2.0.
  66  */
  67
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/kernel.h>
  72 #include <sys/malloc.h>
  73 #include <sys/mbuf.h>
  74 #include <sys/socket.h>
  75 #include <sys/sockio.h>
  76 #include <sys/sysctl.h>
  77
  78 #include <net/dlil.h>
  79 #include <net/if.h>
  80 #include <net/route.h>
  81 #include <net/if_llc.h>
  82 #include <net/if_dl.h>
  83 #include <net/if_types.h>
  84 #include <net/kpi_protocol.h>
  85 #include <netinet/in.h>
  86 #include <netinet/in_var.h>
  87 #include <netinet/if_ether.h>
  88 #include <netinet/in_systm.h>
  89 #include <netinet/ip.h>
  90 #include <netinet/in_arp.h>
  91
  92 #include <sys/socketvar.h>
  93
  94 #include <net/dlil.h>
  95
  96 /* #include "vlan.h" */
  97 #if NVLAN > 0
  98 #include <net/if_vlan_var.h>
  99 #endif /* NVLAN > 0 */
 100 #include <net/ether_if_module.h>
 101 #if CONFIG_MACF
 102 #include <security/mac_framework.h>
 103 #endif
 104
 105 /* Local function declarations */
 106 extern void *kdp_get_interface(void);
 107 extern void kdp_set_ip_and_mac_addresses(struct in_addr *ipaddr,
 108     struct ether_addr *macaddr);
 109
 110 #define _ip_copy(dst, src)      \
 111         bcopy(src, dst, sizeof (struct in_addr))
 112
 113 static void
 114 ether_inet_arp_input(struct ifnet *ifp, struct mbuf *m)
 115 {
 116         struct ether_arp *ea;
 117         struct sockaddr_dl      sender_hw;
 118         struct sockaddr_in      sender_ip;
 119         struct sockaddr_in      target_ip;
 120
 121         if (mbuf_len(m) < sizeof(*ea) && mbuf_pullup(&m, sizeof(*ea)) != 0) {
 122                 return;
 123         }
 124
 125         ea = mbuf_data(m);
 126
 127         /* Verify this is an ethernet/ip arp and address lengths are correct */
 128         if (ntohs(ea->arp_hrd) != ARPHRD_ETHER ||
 129             ntohs(ea->arp_pro) != ETHERTYPE_IP ||
 130             ea->arp_pln != sizeof(struct in_addr) ||
 131             ea->arp_hln != ETHER_ADDR_LEN) {
 132                 mbuf_freem(m);
 133                 return;
 134         }
 135
 136         /* Verify the sender is not broadcast */
 137         if (bcmp(ea->arp_sha, etherbroadcastaddr, ETHER_ADDR_LEN) == 0) {
 138                 mbuf_freem(m);
 139                 return;
 140         }
 141
 142         bzero(&sender_ip, sizeof(sender_ip));
 143         sender_ip.sin_len = sizeof(sender_ip);
 144         sender_ip.sin_family = AF_INET;
 145         _ip_copy(&sender_ip.sin_addr, ea->arp_spa);
 146         target_ip = sender_ip;
 147         _ip_copy(&target_ip.sin_addr, ea->arp_tpa);
 148
 149         bzero(&sender_hw, sizeof(sender_hw));
 150         sender_hw.sdl_len = sizeof(sender_hw);
 151         sender_hw.sdl_family = AF_LINK;
 152         sender_hw.sdl_type = IFT_ETHER;
 153         sender_hw.sdl_alen = ETHER_ADDR_LEN;
 154         bcopy(ea->arp_sha, LLADDR(&sender_hw), ETHER_ADDR_LEN);
 155
 156         /* update L2 reachability record, if present */
 157         arp_llreach_set_reachable(ifp, LLADDR(&sender_hw), ETHER_ADDR_LEN);
 158
 159         arp_ip_handle_input(ifp, ntohs(ea->arp_op), &sender_hw, &sender_ip,
 160             &target_ip);
 161         mbuf_freem(m);
 162 }
 163
 164 /*
 165  * Process a received Ethernet packet;
 166  * the packet is in the mbuf chain m without
 167  * the ether header, which is provided separately.
 168  */
 169 static errno_t
 170 ether_inet_input(ifnet_t ifp, protocol_family_t protocol_family,
 171     mbuf_t m_list)
 172 {
 173 #pragma unused(ifp, protocol_family)
 174         mbuf_t  m;
 175         mbuf_t  *tailptr = &m_list;
 176         mbuf_t  nextpkt;
 177
 178         /* Strip ARP and non-IP packets out of the list */
 179         for (m = m_list; m; m = nextpkt) {
 180                 struct ether_header *eh = mbuf_pkthdr_header(m);
 181                 struct ifnet *mifp;
 182
 183                 /*
 184                  * Trust the ifp in the mbuf, rather than ifproto's
 185                  * since the packet could have been injected via
 186                  * a dlil_input_packet_list() using an ifp that is
 187                  * different than the one where the packet really
 188                  * came from.
 189                  */
 190                 mifp = mbuf_pkthdr_rcvif(m);
 191
 192                 nextpkt = m->m_nextpkt;
 193
 194                 if (eh->ether_type == htons(ETHERTYPE_IP)) {
 195                         /*
 196                          * Update L2 reachability record, if present
 197                          * (and if not a broadcast sender).
 198                          */
 199                         if (bcmp(eh->ether_shost, etherbroadcastaddr,
 200                             ETHER_ADDR_LEN) != 0) {
 201                                 arp_llreach_set_reachable(mifp, eh->ether_shost,
 202                                     ETHER_ADDR_LEN);
 203                         }
 204                         /* put this packet in the list */
 205                         *tailptr = m;
 206                         tailptr = &m->m_nextpkt;
 207                 } else {
 208                         /* Pass ARP packets to arp input */
 209                         m->m_nextpkt = NULL;
 210                         if (eh->ether_type == htons(ETHERTYPE_ARP)) {
 211                                 ether_inet_arp_input(mifp, m);
 212                         } else {
 213                                 mbuf_freem(m);
 214                         }
 215                 }
 216         }
 217
 218         *tailptr = NULL;
 219
 220         /* Pass IP list to ip input */
 221         if (m_list != NULL && proto_input(PF_INET, m_list) != 0) {
 222                 mbuf_freem_list(m_list);
 223         }
 224
 225         return EJUSTRETURN;
 226 }
 227
 228 static errno_t
 229 ether_inet_pre_output(ifnet_t ifp, protocol_family_t protocol_family,
 230     mbuf_t *m0, const struct sockaddr *dst_netaddr,
 231     void *route, char *type, char *edst)
 232 {
 233 #pragma unused(protocol_family)
 234         struct mbuf *m = *m0;
 235         const struct ether_header *eh;
 236         errno_t result = 0;
 237
 238         if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) {
 239                 return ENETDOWN;
 240         }
 241
 242         /*
 243          * Tell ether_frameout it's ok to loop packet unless negated below.
 244          */
 245         m->m_flags |= M_LOOP;
 246
 247         switch (dst_netaddr->sa_family) {
 248         case AF_INET: {
 249                 struct sockaddr_dl ll_dest;
 250
 251                 result = arp_lookup_ip(ifp,
 252                     (const struct sockaddr_in *)(uintptr_t)(size_t)dst_netaddr,
 253                     &ll_dest, sizeof(ll_dest), (route_t)route, *m0);
 254                 if (result == 0) {
 255                         u_int16_t ethertype_ip = htons(ETHERTYPE_IP);
 256
 257                         bcopy(LLADDR(&ll_dest), edst, ETHER_ADDR_LEN);
 258                         bcopy(&ethertype_ip, type, sizeof(ethertype_ip));
 259                 }
 260                 break;
 261         }
 262
 263         case pseudo_AF_HDRCMPLT:
 264         case AF_UNSPEC:
 265                 m->m_flags &= ~M_LOOP;
 266                 eh = (const struct ether_header *)(uintptr_t)(size_t)
 267                     dst_netaddr->sa_data;
 268                 (void) memcpy(edst, eh->ether_dhost, 6);
 269                 bcopy(&eh->ether_type, type, sizeof(u_short));
 270                 break;
 271
 272         default:
 273                 printf("%s: can't handle af%d\n", if_name(ifp),
 274                     dst_netaddr->sa_family);
 275
 276                 result = EAFNOSUPPORT;
 277                 break;
 278         }
 279
 280         return result;
 281 }
 282
 283 static errno_t
 284 ether_inet_resolve_multi(ifnet_t ifp, const struct sockaddr *proto_addr,
 285     struct sockaddr_dl *out_ll, size_t ll_len)
 286 {
 287         static const size_t minsize =
 288             offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
 289         const struct sockaddr_in *sin =
 290             (const struct sockaddr_in *)(uintptr_t)(size_t)proto_addr;
 291
 292         if (proto_addr->sa_family != AF_INET) {
 293                 return EAFNOSUPPORT;
 294         }
 295
 296         if (proto_addr->sa_len < sizeof(struct sockaddr_in)) {
 297                 return EINVAL;
 298         }
 299
 300         if (ll_len < minsize) {
 301                 return EMSGSIZE;
 302         }
 303
 304         bzero(out_ll, minsize);
 305         out_ll->sdl_len = minsize;
 306         out_ll->sdl_family = AF_LINK;
 307         out_ll->sdl_index = ifp->if_index;
 308         out_ll->sdl_type = IFT_ETHER;
 309         out_ll->sdl_nlen = 0;
 310         out_ll->sdl_alen = ETHER_ADDR_LEN;
 311         out_ll->sdl_slen = 0;
 312         ETHER_MAP_IP_MULTICAST(&sin->sin_addr, LLADDR(out_ll));
 313
 314         return 0;
 315 }
 316
 317 static errno_t
 318 ether_inet_prmod_ioctl(ifnet_t ifp, protocol_family_t protocol_family,
 319     u_long command, void *data)
 320 {
 321 #pragma unused(protocol_family)
 322         int error = 0;
 323
 324         switch (command) {
 325         case SIOCSIFADDR:               /* struct ifaddr pointer */
 326         case SIOCAIFADDR: {             /* struct ifaddr pointer */
 327                 /*
 328                  * Note: caller of ifnet_ioctl() passes in pointer to
 329                  * struct ifaddr as parameter to SIOC{A,S}IFADDR, for
 330                  * legacy reasons.
 331                  */
 332                 struct ifaddr *ifa = data;
 333
 334                 if (!(ifnet_flags(ifp) & IFF_RUNNING)) {
 335                         ifnet_set_flags(ifp, IFF_UP, IFF_UP);
 336                         ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
 337                 }
 338
 339                 if (ifaddr_address_family(ifa) != AF_INET) {
 340                         break;
 341                 }
 342
 343                 inet_arp_init_ifaddr(ifp, ifa);
 344
 345                 if (command != SIOCSIFADDR) {
 346                         break;
 347                 }
 348
 349                 /*
 350                  * Register new IP and MAC addresses with the kernel
 351                  * debugger if the interface is the same as was registered
 352                  * by IOKernelDebugger. If no interface was registered,
 353                  * fall back and just match against en0 interface.
 354                  * Do this only for the first address of the interface
 355                  * and not for aliases.
 356                  */
 357                 if ((kdp_get_interface() != 0 &&
 358                     kdp_get_interface() == ifp->if_softc) ||
 359                     (kdp_get_interface() == 0 && ifp->if_unit == 0)) {
 360                         kdp_set_ip_and_mac_addresses(&(IA_SIN(ifa)->sin_addr),
 361                             (struct ether_addr *)IF_LLADDR(ifp));
 362                 }
 363                 break;
 364         }
 365
 366         case SIOCGIFADDR: {             /* struct ifreq */
 367                 struct ifreq *ifr = data;
 368                 ifnet_guarded_lladdr_copy_bytes(ifp, ifr->ifr_addr.sa_data,
 369                     ETHER_ADDR_LEN);
 370                 break;
 371         }
 372
 373         default:
 374                 error = EOPNOTSUPP;
 375                 break;
 376         }
 377
 378         return error;
 379 }
 380
 381 static void
 382 ether_inet_event(ifnet_t ifp, protocol_family_t protocol,
 383     const struct kev_msg *event)
 384 {
 385 #pragma unused(protocol)
 386         ifaddr_t *addresses;
 387
 388         if (event->vendor_code != KEV_VENDOR_APPLE ||
 389             event->kev_class != KEV_NETWORK_CLASS ||
 390             event->kev_subclass != KEV_DL_SUBCLASS ||
 391             event->event_code != KEV_DL_LINK_ADDRESS_CHANGED) {
 392                 return;
 393         }
 394
 395         if (ifnet_get_address_list_family(ifp, &addresses, AF_INET) == 0) {
 396                 int i;
 397
 398                 for (i = 0; addresses[i] != NULL; i++) {
 399                         inet_arp_init_ifaddr(ifp, addresses[i]);
 400                 }
 401
 402                 ifnet_free_address_list(addresses);
 403         }
 404 }
 405
 406 static errno_t
 407 ether_inet_arp(ifnet_t ifp, u_short arpop, const struct sockaddr_dl *sender_hw,
 408     const struct sockaddr *sender_proto, const struct sockaddr_dl *target_hw,
 409     const struct sockaddr *target_proto)
 410 {
 411         mbuf_t  m;
 412         errno_t result;
 413         struct ether_header *eh;
 414         struct ether_arp *ea;
 415         const struct sockaddr_in *sender_ip =
 416             (const struct sockaddr_in *)(uintptr_t)(size_t)sender_proto;
 417         const struct sockaddr_inarp *target_ip =
 418             (const struct sockaddr_inarp *)(uintptr_t)(size_t)target_proto;
 419         char *datap;
 420
 421         if (target_ip == NULL) {
 422                 return EINVAL;
 423         }
 424
 425         if ((sender_ip && sender_ip->sin_family != AF_INET) ||
 426             target_ip->sin_family != AF_INET) {
 427                 return EAFNOSUPPORT;
 428         }
 429
 430         result = mbuf_gethdr(MBUF_DONTWAIT, MBUF_TYPE_DATA, &m);
 431         if (result != 0) {
 432                 return result;
 433         }
 434
 435         mbuf_setlen(m, sizeof(*ea));
 436         mbuf_pkthdr_setlen(m, sizeof(*ea));
 437
 438         /* Move the data pointer in the mbuf to the end, aligned to 4 bytes */
 439         datap = mbuf_datastart(m);
 440         datap += mbuf_trailingspace(m);
 441         datap -= (((uintptr_t)datap) & 0x3);
 442         mbuf_setdata(m, datap, sizeof(*ea));
 443         ea = mbuf_data(m);
 444
 445         /*
 446          * Prepend the ethernet header, we will send the raw frame;
 447          * callee frees the original mbuf when allocation fails.
 448          */
 449         result = mbuf_prepend(&m, sizeof(*eh), MBUF_DONTWAIT);
 450         if (result != 0) {
 451                 return result;
 452         }
 453
 454         eh = mbuf_data(m);
 455         eh->ether_type = htons(ETHERTYPE_ARP);
 456
 457 #if CONFIG_MACF_NET
 458         mac_mbuf_label_associate_linklayer(ifp, m);
 459 #endif
 460
 461         /* Fill out the arp header */
 462         ea->arp_pro = htons(ETHERTYPE_IP);
 463         ea->arp_hln = sizeof(ea->arp_sha);
 464         ea->arp_pln = sizeof(ea->arp_spa);
 465         ea->arp_hrd = htons(ARPHRD_ETHER);
 466         ea->arp_op = htons(arpop);
 467
 468         /* Sender Hardware */
 469         if (sender_hw != NULL) {
 470                 bcopy(CONST_LLADDR(sender_hw), ea->arp_sha,
 471                     sizeof(ea->arp_sha));
 472         } else {
 473                 ifnet_lladdr_copy_bytes(ifp, ea->arp_sha, ETHER_ADDR_LEN);
 474         }
 475         ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, sizeof(eh->ether_shost));
 476
 477         /* Sender IP */
 478         if (sender_ip != NULL) {
 479                 bcopy(&sender_ip->sin_addr, ea->arp_spa, sizeof(ea->arp_spa));
 480         } else {
 481                 struct ifaddr *ifa;
 482
 483                 /* Look for an IP address to use as our source */
 484                 ifnet_lock_shared(ifp);
 485                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 486                         IFA_LOCK(ifa);
 487                         if (ifa->ifa_addr != NULL &&
 488                             ifa->ifa_addr->sa_family == AF_INET) {
 489                                 bcopy(&((struct sockaddr_in *)(void *)
 490                                     ifa->ifa_addr)->sin_addr, ea->arp_spa,
 491                                     sizeof(ea->arp_spa));
 492                                 IFA_UNLOCK(ifa);
 493                                 break;
 494                         }
 495                         IFA_UNLOCK(ifa);
 496                 }
 497                 ifnet_lock_done(ifp);
 498
 499                 if (ifa == NULL) {
 500                         mbuf_freem(m);
 501                         return ENXIO;
 502                 }
 503         }
 504
 505         /* Target Hardware */
 506         if (target_hw == NULL) {
 507                 bzero(ea->arp_tha, sizeof(ea->arp_tha));
 508                 bcopy(etherbroadcastaddr, eh->ether_dhost,
 509                     sizeof(eh->ether_dhost));
 510                 m->m_flags |= M_BCAST;
 511         } else {
 512                 bcopy(CONST_LLADDR(target_hw), ea->arp_tha,
 513                     sizeof(ea->arp_tha));
 514                 bcopy(CONST_LLADDR(target_hw), eh->ether_dhost,
 515                     sizeof(eh->ether_dhost));
 516
 517                 if (bcmp(eh->ether_dhost, etherbroadcastaddr,
 518                     ETHER_ADDR_LEN) == 0) {
 519                         m->m_flags |= M_BCAST;
 520                 }
 521         }
 522
 523         /* Target IP */
 524         bcopy(&target_ip->sin_addr, ea->arp_tpa, sizeof(ea->arp_tpa));
 525
 526         /*
 527          * PKTF_{INET,INET6}_RESOLVE_RTR are mutually exclusive, so make
 528          * sure only one of them is set (just in case.)
 529          */
 530         m->m_pkthdr.pkt_flags &= ~(PKTF_INET6_RESOLVE | PKTF_RESOLVE_RTR);
 531         m->m_pkthdr.pkt_flags |= PKTF_INET_RESOLVE;
 532         /*
 533          * If this is an ARP request for a (default) router, mark
 534          * the packet accordingly so that the driver can find out,
 535          * in case it needs to perform driver-specific action(s).
 536          */
 537         if (arpop == ARPOP_REQUEST && (target_ip->sin_other & SIN_ROUTER)) {
 538                 m->m_pkthdr.pkt_flags |= PKTF_RESOLVE_RTR;
 539         }
 540
 541         if (ifp->if_eflags & IFEF_TXSTART) {
 542                 /*
 543                  * Use control service class if the interface
 544                  * supports transmit-start model
 545                  */
 546                 (void) m_set_service_class(m, MBUF_SC_CTL);
 547         }
 548
 549         ifnet_output_raw(ifp, PF_INET, m);
 550
 551         return 0;
 552 }
 553
 554 errno_t
 555 ether_attach_inet(struct ifnet *ifp, protocol_family_t proto_family)
 556 {
 557 #pragma unused(proto_family)
 558         struct ifnet_attach_proto_param_v2 proto;
 559         struct ifnet_demux_desc demux[2];
 560         u_short en_native = htons(ETHERTYPE_IP);
 561         u_short arp_native = htons(ETHERTYPE_ARP);
 562         errno_t error;
 563
 564         bzero(&demux[0], sizeof(demux));
 565         demux[0].type = DLIL_DESC_ETYPE2;
 566         demux[0].data = &en_native;
 567         demux[0].datalen = sizeof(en_native);
 568         demux[1].type = DLIL_DESC_ETYPE2;
 569         demux[1].data = &arp_native;
 570         demux[1].datalen = sizeof(arp_native);
 571
 572         bzero(&proto, sizeof(proto));
 573         proto.demux_list = demux;
 574         proto.demux_count = sizeof(demux) / sizeof(demux[0]);
 575         proto.input = ether_inet_input;
 576         proto.pre_output = ether_inet_pre_output;
 577         proto.ioctl = ether_inet_prmod_ioctl;
 578         proto.event = ether_inet_event;
 579         proto.resolve = ether_inet_resolve_multi;
 580         proto.send_arp = ether_inet_arp;
 581
 582         error = ifnet_attach_protocol_v2(ifp, proto_family, &proto);
 583         if (error && error != EEXIST) {
 584                 printf("WARNING: %s can't attach ip to %s\n", __func__,
 585                     if_name(ifp));
 586         }
 587         return error;
 588 }
 589
 590 void
 591 ether_detach_inet(struct ifnet *ifp, protocol_family_t proto_family)
 592 {
 593         (void) ifnet_detach_protocol(ifp, proto_family);
 594 }