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