bsd/net/ether_if_module.c

   1 /*
   2  * Copyright (c) 2000-2017 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
  71 #include <pexpert/pexpert.h>
  72
  73 #define etherbroadcastaddr      fugly
  74 #include <net/if.h>
  75 #include <net/route.h>
  76 #include <net/if_llc.h>
  77 #include <net/if_dl.h>
  78 #include <net/if_types.h>
  79 #include <net/if_ether.h>
  80 #include <net/if_gif.h>
  81 #include <netinet/if_ether.h>
  82 #include <netinet/in.h> /* For M_LOOP */
  83 #include <net/kpi_interface.h>
  84 #include <net/kpi_protocol.h>
  85 #undef etherbroadcastaddr
  86
  87 /*
  88  #if INET
  89  #include <netinet/in.h>
  90  #include <netinet/in_var.h>
  91  *
  92  #include <netinet/in_systm.h>
  93  #include <netinet/ip.h>
  94  #endif
  95  */
  96 #include <net/ether_if_module.h>
  97 #include <sys/socketvar.h>
  98 #include <net/if_vlan_var.h>
  99 #include <net/if_6lowpan_var.h>
 100 #if BOND
 101 #include <net/if_bond_internal.h>
 102 #endif /* BOND */
 103 #if IF_BRIDGE
 104 #include <net/if_bridgevar.h>
 105 #endif /* IF_BRIDGE */
 106 #if IF_FAKE
 107 #include <net/if_fake_var.h>
 108 #endif /* IF_FAKE */
 109 #if IF_HEADLESS
 110 extern void if_headless_init(void);
 111 #endif /* IF_HEADLESS */
 112
 113 #include <net/dlil.h>
 114
 115 SYSCTL_DECL(_net_link);
 116 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW | CTLFLAG_LOCKED, 0,
 117     "Ethernet");
 118
 119 struct en_desc {
 120         u_int16_t type;                 /* Type of protocol stored in data */
 121         u_int32_t protocol_family;      /* Protocol family */
 122         u_int32_t data[2];              /* Protocol data */
 123 };
 124
 125 /* descriptors are allocated in blocks of ETHER_DESC_BLK_SIZE */
 126 #if CONFIG_EMBEDDED
 127 #define ETHER_DESC_BLK_SIZE (2) /* IP, ARP */
 128 #else
 129 #define ETHER_DESC_BLK_SIZE (10)
 130 #endif
 131
 132 /*
 133  * Header for the demux list, hangs off of IFP at if_family_cookie
 134  */
 135 struct ether_desc_blk_str {
 136         u_int32_t  n_max_used;
 137         u_int32_t       n_count;
 138         u_int32_t       n_used;
 139         struct en_desc  block_ptr[1];
 140 };
 141
 142 /* Size of the above struct before the array of struct en_desc */
 143 #define ETHER_DESC_HEADER_SIZE  \
 144         ((size_t) offsetof(struct ether_desc_blk_str, block_ptr))
 145
 146 __private_extern__ u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
 147 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 148
 149 /*
 150  * Release all descriptor entries owned by this protocol (there may be several).
 151  * Setting the type to 0 releases the entry. Eventually we should compact-out
 152  * the unused entries.
 153  */
 154 int
 155 ether_del_proto(ifnet_t ifp, protocol_family_t protocol_family)
 156 {
 157         struct ether_desc_blk_str *desc_blk =
 158             (struct ether_desc_blk_str *)ifp->if_family_cookie;
 159         u_int32_t current = 0;
 160         int found = 0;
 161
 162         if (desc_blk == NULL) {
 163                 return 0;
 164         }
 165
 166         for (current = desc_blk->n_max_used; current > 0; current--) {
 167                 if (desc_blk->block_ptr[current - 1].protocol_family ==
 168                     protocol_family) {
 169                         found = 1;
 170                         desc_blk->block_ptr[current - 1].type = 0;
 171                         desc_blk->n_used--;
 172                 }
 173         }
 174
 175         if (desc_blk->n_used == 0) {
 176                 FREE(ifp->if_family_cookie, M_IFADDR);
 177                 ifp->if_family_cookie = 0;
 178         } else {
 179                 /* Decrement n_max_used */
 180                 for (; desc_blk->n_max_used > 0 &&
 181                     desc_blk->block_ptr[desc_blk->n_max_used - 1].type == 0;
 182                     desc_blk->n_max_used--) {
 183                         ;
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int
 191 ether_add_proto_internal(struct ifnet *ifp, protocol_family_t protocol,
 192     const struct ifnet_demux_desc *demux)
 193 {
 194         struct en_desc *ed;
 195         struct ether_desc_blk_str *desc_blk =
 196             (struct ether_desc_blk_str *)ifp->if_family_cookie;
 197         u_int32_t i;
 198
 199         switch (demux->type) {
 200         /* These types are supported */
 201         /* Top three are preferred */
 202         case DLIL_DESC_ETYPE2:
 203                 if (demux->datalen != 2) {
 204                         return EINVAL;
 205                 }
 206                 break;
 207
 208         case DLIL_DESC_SAP:
 209                 if (demux->datalen != 3) {
 210                         return EINVAL;
 211                 }
 212                 break;
 213
 214         case DLIL_DESC_SNAP:
 215                 if (demux->datalen != 5) {
 216                         return EINVAL;
 217                 }
 218                 break;
 219
 220         default:
 221                 return ENOTSUP;
 222         }
 223
 224         /* Verify a matching descriptor does not exist */
 225         if (desc_blk != NULL) {
 226                 switch (demux->type) {
 227                 case DLIL_DESC_ETYPE2:
 228                         for (i = 0; i < desc_blk->n_max_used; i++) {
 229                                 if (desc_blk->block_ptr[i].type ==
 230                                     DLIL_DESC_ETYPE2 &&
 231                                     desc_blk->block_ptr[i].data[0] ==
 232                                     *(u_int16_t*)demux->data) {
 233                                         return EADDRINUSE;
 234                                 }
 235                         }
 236                         break;
 237                 case DLIL_DESC_SAP:
 238                 case DLIL_DESC_SNAP:
 239                         for (i = 0; i < desc_blk->n_max_used; i++) {
 240                                 if (desc_blk->block_ptr[i].type ==
 241                                     demux->type &&
 242                                     bcmp(desc_blk->block_ptr[i].data,
 243                                     demux->data, demux->datalen) == 0) {
 244                                         return EADDRINUSE;
 245                                 }
 246                         }
 247                         break;
 248                 }
 249         }
 250
 251         /* Check for case where all of the descriptor blocks are in use */
 252         if (desc_blk == NULL || desc_blk->n_used == desc_blk->n_count) {
 253                 struct ether_desc_blk_str *tmp;
 254                 u_int32_t new_count = ETHER_DESC_BLK_SIZE;
 255                 u_int32_t new_size;
 256                 u_int32_t old_size = 0;
 257
 258                 i = 0;
 259
 260                 if (desc_blk) {
 261                         new_count += desc_blk->n_count;
 262                         old_size = desc_blk->n_count * sizeof(struct en_desc) +
 263                             ETHER_DESC_HEADER_SIZE;
 264                         i = desc_blk->n_used;
 265                 }
 266
 267                 new_size = new_count * sizeof(struct en_desc) +
 268                     ETHER_DESC_HEADER_SIZE;
 269
 270                 tmp = _MALLOC(new_size, M_IFADDR, M_WAITOK);
 271                 if (tmp == NULL) {
 272                         /*
 273                          * Remove any previous descriptors set in the call.
 274                          */
 275                         return ENOMEM;
 276                 }
 277
 278                 bzero(((char *)tmp) + old_size, new_size - old_size);
 279                 if (desc_blk) {
 280                         bcopy(desc_blk, tmp, old_size);
 281                         FREE(desc_blk, M_IFADDR);
 282                 }
 283                 desc_blk = tmp;
 284                 ifp->if_family_cookie = (uintptr_t)desc_blk;
 285                 desc_blk->n_count = new_count;
 286         } else {
 287                 /* Find a free entry */
 288                 for (i = 0; i < desc_blk->n_count; i++) {
 289                         if (desc_blk->block_ptr[i].type == 0) {
 290                                 break;
 291                         }
 292                 }
 293         }
 294
 295         /* Bump n_max_used if appropriate */
 296         if (i + 1 > desc_blk->n_max_used) {
 297                 desc_blk->n_max_used = i + 1;
 298         }
 299
 300         ed = &desc_blk->block_ptr[i];
 301         ed->protocol_family = protocol;
 302         ed->data[0] = 0;
 303         ed->data[1] = 0;
 304
 305         switch (demux->type) {
 306         case DLIL_DESC_ETYPE2:
 307                 /* 2 byte ethernet raw protocol type is at native_type */
 308                 /* prtocol must be in network byte order */
 309                 ed->type = DLIL_DESC_ETYPE2;
 310                 ed->data[0] = *(u_int16_t*)demux->data;
 311                 break;
 312
 313         case DLIL_DESC_SAP:
 314                 ed->type = DLIL_DESC_SAP;
 315                 bcopy(demux->data, &ed->data[0], 3);
 316                 break;
 317
 318         case DLIL_DESC_SNAP: {
 319                 u_int8_t*       pDest = ((u_int8_t*)&ed->data[0]) + 3;
 320                 ed->type = DLIL_DESC_SNAP;
 321                 bcopy(demux->data, pDest, 5);
 322                 break;
 323         }
 324         }
 325
 326         desc_blk->n_used++;
 327
 328         return 0;
 329 }
 330
 331 int
 332 ether_add_proto(ifnet_t  ifp, protocol_family_t protocol,
 333     const struct ifnet_demux_desc *demux_list, u_int32_t demux_count)
 334 {
 335         int error = 0;
 336         u_int32_t i;
 337
 338         for (i = 0; i < demux_count; i++) {
 339                 error = ether_add_proto_internal(ifp, protocol, &demux_list[i]);
 340                 if (error) {
 341                         ether_del_proto(ifp, protocol);
 342                         break;
 343                 }
 344         }
 345
 346         return error;
 347 }
 348
 349 int
 350 ether_demux(ifnet_t ifp, mbuf_t m, char *frame_header,
 351     protocol_family_t *protocol_family)
 352 {
 353         struct ether_header *eh = (struct ether_header *)(void *)frame_header;
 354         u_short  ether_type = eh->ether_type;
 355         u_int16_t type;
 356         u_int8_t *data;
 357         u_int32_t i = 0;
 358         struct ether_desc_blk_str *desc_blk =
 359             (struct ether_desc_blk_str *)ifp->if_family_cookie;
 360         u_int32_t maxd = desc_blk ? desc_blk->n_max_used : 0;
 361         struct en_desc  *ed = desc_blk ? desc_blk->block_ptr : NULL;
 362         u_int32_t extProto1 = 0;
 363         u_int32_t extProto2 = 0;
 364
 365         if (eh->ether_dhost[0] & 1) {
 366                 /* Check for broadcast */
 367                 if (_ether_cmp(etherbroadcastaddr, eh->ether_dhost) == 0) {
 368                         m->m_flags |= M_BCAST;
 369                 } else {
 370                         m->m_flags |= M_MCAST;
 371                 }
 372         }
 373
 374         if (m->m_flags & M_HASFCS) {
 375                 /*
 376                  * If the M_HASFCS is set by the driver we want to make sure
 377                  * that we strip off the trailing FCS data before handing it
 378                  * up the stack.
 379                  */
 380                 m_adj(m, -ETHER_CRC_LEN);
 381                 m->m_flags &= ~M_HASFCS;
 382         }
 383
 384         if ((eh->ether_dhost[0] & 1) == 0) {
 385                 /*
 386                  * When the driver is put into promiscuous mode we may receive
 387                  * unicast frames that are not intended for our interfaces.
 388                  * They are marked here as being promiscuous so the caller may
 389                  * dispose of them after passing the packets to any interface
 390                  * filters.
 391                  */
 392                 if (_ether_cmp(eh->ether_dhost, IF_LLADDR(ifp))) {
 393                         m->m_flags |= M_PROMISC;
 394                 }
 395         }
 396
 397         /* check for IEEE 802.15.4 */
 398         if (ether_type == htons(ETHERTYPE_IEEE802154)) {
 399                 *protocol_family = PF_802154;
 400                 return 0;
 401         }
 402
 403         /* check for VLAN */
 404         if ((m->m_pkthdr.csum_flags & CSUM_VLAN_TAG_VALID) != 0) {
 405                 if (EVL_VLANOFTAG(m->m_pkthdr.vlan_tag) != 0) {
 406                         *protocol_family = PF_VLAN;
 407                         return 0;
 408                 }
 409                 /* the packet is just priority-tagged, clear the bit */
 410                 m->m_pkthdr.csum_flags &= ~CSUM_VLAN_TAG_VALID;
 411         } else if (ether_type == htons(ETHERTYPE_VLAN)) {
 412                 struct ether_vlan_header *      evl;
 413
 414                 evl = (struct ether_vlan_header *)(void *)frame_header;
 415                 if (m->m_len < ETHER_VLAN_ENCAP_LEN ||
 416                     ntohs(evl->evl_proto) == ETHERTYPE_VLAN ||
 417                     EVL_VLANOFTAG(ntohs(evl->evl_tag)) != 0) {
 418                         *protocol_family = PF_VLAN;
 419                         return 0;
 420                 }
 421                 /* the packet is just priority-tagged */
 422
 423                 /* make the encapsulated ethertype the actual ethertype */
 424                 ether_type = evl->evl_encap_proto = evl->evl_proto;
 425
 426                 /* remove the encapsulation header */
 427                 m->m_len -= ETHER_VLAN_ENCAP_LEN;
 428                 m->m_data += ETHER_VLAN_ENCAP_LEN;
 429                 m->m_pkthdr.len -= ETHER_VLAN_ENCAP_LEN;
 430                 m->m_pkthdr.csum_flags = 0; /* can't trust hardware checksum */
 431         } else if (ether_type == htons(ETHERTYPE_ARP)) {
 432                 m->m_pkthdr.pkt_flags |= PKTF_INET_RESOLVE; /* ARP packet */
 433         }
 434         data = mtod(m, u_int8_t*);
 435
 436         /*
 437          * Determine the packet's protocol type and stuff the protocol into
 438          * longs for quick compares.
 439          */
 440         if (ntohs(ether_type) <= 1500) {
 441                 bcopy(data, &extProto1, sizeof(u_int32_t));
 442
 443                 /* SAP or SNAP */
 444                 if ((extProto1 & htonl(0xFFFFFF00)) == htonl(0xAAAA0300)) {
 445                         /* SNAP */
 446                         type = DLIL_DESC_SNAP;
 447                         bcopy(data + sizeof(u_int32_t), &extProto2,
 448                             sizeof(u_int32_t));
 449                         extProto1 &= htonl(0x000000FF);
 450                 } else {
 451                         type = DLIL_DESC_SAP;
 452                         extProto1 &= htonl(0xFFFFFF00);
 453                 }
 454         } else {
 455                 type = DLIL_DESC_ETYPE2;
 456         }
 457
 458         /*
 459          * Search through the connected protocols for a match.
 460          */
 461         switch (type) {
 462         case DLIL_DESC_ETYPE2:
 463                 for (i = 0; i < maxd; i++) {
 464                         if ((ed[i].type == type) &&
 465                             (ed[i].data[0] == ether_type)) {
 466                                 *protocol_family = ed[i].protocol_family;
 467                                 return 0;
 468                         }
 469                 }
 470                 break;
 471
 472         case DLIL_DESC_SAP:
 473                 for (i = 0; i < maxd; i++) {
 474                         if ((ed[i].type == type) &&
 475                             (ed[i].data[0] == extProto1)) {
 476                                 *protocol_family = ed[i].protocol_family;
 477                                 return 0;
 478                         }
 479                 }
 480                 break;
 481
 482         case DLIL_DESC_SNAP:
 483                 for (i = 0; i < maxd; i++) {
 484                         if ((ed[i].type == type) &&
 485                             (ed[i].data[0] == extProto1) &&
 486                             (ed[i].data[1] == extProto2)) {
 487                                 *protocol_family = ed[i].protocol_family;
 488                                 return 0;
 489                         }
 490                 }
 491                 break;
 492         }
 493
 494         return ENOENT;
 495 }
 496
 497 /*
 498  * On embedded, ether_frameout is practicaly ether_frameout_extended.
 499  * On non-embedded, ether_frameout has long been exposed as a public KPI,
 500  * and therefore its signature must remain the same (without the pre- and
 501  * postpend length parameters.)
 502  */
 503 #if KPI_INTERFACE_EMBEDDED
 504 int
 505 ether_frameout(struct ifnet *ifp, struct mbuf **m,
 506     const struct sockaddr *ndest, const char *edst,
 507     const char *ether_type, u_int32_t *prepend_len, u_int32_t *postpend_len)
 508 #else /* !KPI_INTERFACE_EMBEDDED */
 509 int
 510 ether_frameout(struct ifnet *ifp, struct mbuf **m,
 511     const struct sockaddr *ndest, const char *edst,
 512     const char *ether_type)
 513 #endif /* KPI_INTERFACE_EMBEDDED */
 514 {
 515 #if KPI_INTERFACE_EMBEDDED
 516         return ether_frameout_extended(ifp, m, ndest, edst, ether_type,
 517                    prepend_len, postpend_len);
 518 #else /* !KPI_INTERFACE_EMBEDDED */
 519         return ether_frameout_extended(ifp, m, ndest, edst, ether_type,
 520                    NULL, NULL);
 521 #endif /* !KPI_INTERFACE_EMBEDDED */
 522 }
 523
 524 /*
 525  * Ethernet output routine.
 526  * Encapsulate a packet of type family for the local net.
 527  * Use trailer local net encapsulation if enough data in first
 528  * packet leaves a multiple of 512 bytes of data in remainder.
 529  */
 530 int
 531 ether_frameout_extended(struct ifnet *ifp, struct mbuf **m,
 532     const struct sockaddr *ndest, const char *edst,
 533     const char *ether_type, u_int32_t *prepend_len, u_int32_t *postpend_len)
 534 {
 535         struct ether_header *eh;
 536         int hlen;       /* link layer header length */
 537
 538         hlen = ETHER_HDR_LEN;
 539
 540         /*
 541          * If a simplex interface, and the packet is being sent to our
 542          * Ethernet address or a broadcast address, loopback a copy.
 543          * XXX To make a simplex device behave exactly like a duplex
 544          * device, we should copy in the case of sending to our own
 545          * ethernet address (thus letting the original actually appear
 546          * on the wire). However, we don't do that here for security
 547          * reasons and compatibility with the original behavior.
 548          */
 549         if ((ifp->if_flags & IFF_SIMPLEX) &&
 550             ((*m)->m_flags & M_LOOP) && lo_ifp != NULL) {
 551                 if ((*m)->m_flags & M_BCAST) {
 552                         struct mbuf *n = m_copy(*m, 0, (int)M_COPYALL);
 553                         if (n != NULL) {
 554                                 dlil_output(lo_ifp, ndest->sa_family,
 555                                     n, NULL, ndest, 0, NULL);
 556                         }
 557                 } else if (_ether_cmp(edst, IF_LLADDR(ifp)) == 0) {
 558                         dlil_output(lo_ifp, ndest->sa_family, *m,
 559                             NULL, ndest, 0, NULL);
 560                         return EJUSTRETURN;
 561                 }
 562         }
 563
 564         /*
 565          * Add local net header.  If no space in first mbuf,
 566          * allocate another.
 567          */
 568         M_PREPEND(*m, sizeof(struct ether_header), M_DONTWAIT, 0);
 569         if (*m == NULL) {
 570                 return EJUSTRETURN;
 571         }
 572
 573         if (prepend_len != NULL) {
 574                 *prepend_len = sizeof(struct ether_header);
 575         }
 576         if (postpend_len != NULL) {
 577                 *postpend_len = 0;
 578         }
 579
 580         eh = mtod(*m, struct ether_header *);
 581         (void) memcpy(&eh->ether_type, ether_type, sizeof(eh->ether_type));
 582         (void) memcpy(eh->ether_dhost, edst, ETHER_ADDR_LEN);
 583         ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, ETHER_ADDR_LEN);
 584
 585         return 0;
 586 }
 587
 588 errno_t
 589 ether_check_multi(ifnet_t ifp, const struct sockaddr *proto_addr)
 590 {
 591 #pragma unused(ifp)
 592         errno_t result = EAFNOSUPPORT;
 593         const u_char *e_addr;
 594
 595         /*
 596          * AF_SPEC and AF_LINK don't require translation. We do
 597          * want to verify that they specify a valid multicast.
 598          */
 599         switch (proto_addr->sa_family) {
 600         case AF_UNSPEC:
 601                 e_addr = (const u_char*)&proto_addr->sa_data[0];
 602                 if ((e_addr[0] & 0x01) != 0x01) {
 603                         result = EADDRNOTAVAIL;
 604                 } else {
 605                         result = 0;
 606                 }
 607                 break;
 608
 609         case AF_LINK:
 610                 e_addr = CONST_LLADDR((const struct sockaddr_dl*)
 611                     (uintptr_t)(size_t)proto_addr);
 612                 if ((e_addr[0] & 0x01) != 0x01) {
 613                         result = EADDRNOTAVAIL;
 614                 } else {
 615                         result = 0;
 616                 }
 617                 break;
 618         }
 619
 620         return result;
 621 }
 622
 623 int
 624 ether_ioctl(ifnet_t ifp, u_int32_t command, void *data)
 625 {
 626 #pragma unused(ifp, command, data)
 627         return EOPNOTSUPP;
 628 }
 629
 630 __private_extern__ int
 631 ether_family_init(void)
 632 {
 633         errno_t error = 0;
 634
 635         /* Register protocol registration functions */
 636         if ((error = proto_register_plumber(PF_INET, APPLE_IF_FAM_ETHERNET,
 637             ether_attach_inet, ether_detach_inet)) != 0) {
 638                 printf("proto_register_plumber failed for PF_INET error=%d\n",
 639                     error);
 640                 goto done;
 641         }
 642 #if INET6
 643         if ((error = proto_register_plumber(PF_INET6, APPLE_IF_FAM_ETHERNET,
 644             ether_attach_inet6, ether_detach_inet6)) != 0) {
 645                 printf("proto_register_plumber failed for PF_INET6 error=%d\n",
 646                     error);
 647                 goto done;
 648         }
 649 #endif /* INET6 */
 650 #if VLAN
 651         vlan_family_init();
 652 #endif /* VLAN */
 653 #if BOND
 654         bond_family_init();
 655 #endif /* BOND */
 656 #if IF_BRIDGE
 657         bridgeattach(0);
 658 #endif /* IF_BRIDGE */
 659 #if IF_FAKE
 660         if_fake_init();
 661 #endif /* IF_FAKE */
 662 #if IF_HEADLESS
 663         if_headless_init();
 664 #endif /* IF_HEADLESS */
 665 #if SIXLOWPAN
 666         sixlowpan_family_init();
 667 #endif /* VLAN */
 668 done:
 669
 670         return error;
 671 }