if_ethersubr.c revision 1.15
1 /* $NetBSD: if_ethersubr.c,v 1.15 1995/09/29 03:37:43 phil Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/protosw.h> 44 #include <sys/socket.h> 45 #include <sys/ioctl.h> 46 #include <sys/errno.h> 47 #include <sys/syslog.h> 48 49 #include <machine/cpu.h> 50 51 #include <net/if.h> 52 #include <net/netisr.h> 53 #include <net/route.h> 54 #include <net/if_llc.h> 55 #include <net/if_dl.h> 56 #include <net/if_types.h> 57 58 #include <netinet/in.h> 59 #ifdef INET 60 #include <netinet/in_var.h> 61 #endif 62 #include <netinet/if_ether.h> 63 64 #ifdef NS 65 #include <netns/ns.h> 66 #include <netns/ns_if.h> 67 #endif 68 69 #ifdef ISO 70 #include <netiso/argo_debug.h> 71 #include <netiso/iso.h> 72 #include <netiso/iso_var.h> 73 #include <netiso/iso_snpac.h> 74 #endif 75 76 #ifdef LLC 77 #include <netccitt/dll.h> 78 #include <netccitt/llc_var.h> 79 #endif 80 81 #if defined(LLC) && defined(CCITT) 82 extern struct ifqueue pkintrq; 83 #endif 84 85 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 86 #define senderr(e) { error = (e); goto bad;} 87 88 /* 89 * Ethernet output routine. 90 * Encapsulate a packet of type family for the local net. 91 * Use trailer local net encapsulation if enough data in first 92 * packet leaves a multiple of 512 bytes of data in remainder. 93 * Assumes that ifp is actually pointer to arpcom structure. 94 */ 95 int 96 ether_output(ifp, m0, dst, rt0) 97 register struct ifnet *ifp; 98 struct mbuf *m0; 99 struct sockaddr *dst; 100 struct rtentry *rt0; 101 { 102 u_int16_t etype; 103 int s, error = 0; 104 u_char edst[6]; 105 register struct mbuf *m = m0; 106 register struct rtentry *rt; 107 struct mbuf *mcopy = (struct mbuf *)0; 108 register struct ether_header *eh; 109 struct arpcom *ac = (struct arpcom *)ifp; 110 111 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 112 senderr(ENETDOWN); 113 ifp->if_lastchange = time; 114 if (rt = rt0) { 115 if ((rt->rt_flags & RTF_UP) == 0) { 116 if (rt0 = rt = rtalloc1(dst, 1)) 117 rt->rt_refcnt--; 118 else 119 senderr(EHOSTUNREACH); 120 } 121 if (rt->rt_flags & RTF_GATEWAY) { 122 if (rt->rt_gwroute == 0) 123 goto lookup; 124 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 125 rtfree(rt); rt = rt0; 126 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 127 if ((rt = rt->rt_gwroute) == 0) 128 senderr(EHOSTUNREACH); 129 } 130 } 131 if (rt->rt_flags & RTF_REJECT) 132 if (rt->rt_rmx.rmx_expire == 0 || 133 time.tv_sec < rt->rt_rmx.rmx_expire) 134 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 135 } 136 switch (dst->sa_family) { 137 138 #ifdef INET 139 case AF_INET: 140 if (!arpresolve(ac, rt, m, dst, edst)) 141 return (0); /* if not yet resolved */ 142 /* If broadcasting on a simplex interface, loopback a copy */ 143 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 144 mcopy = m_copy(m, 0, (int)M_COPYALL); 145 etype = ETHERTYPE_IP; 146 break; 147 #endif 148 #ifdef NS 149 case AF_NS: 150 etype = ETHERTYPE_NS; 151 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 152 (caddr_t)edst, sizeof (edst)); 153 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 154 return (looutput(ifp, m, dst, rt)); 155 /* If broadcasting on a simplex interface, loopback a copy */ 156 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 157 mcopy = m_copy(m, 0, (int)M_COPYALL); 158 break; 159 #endif 160 #ifdef ISO 161 case AF_ISO: { 162 int snpalen; 163 struct llc *l; 164 register struct sockaddr_dl *sdl; 165 166 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 167 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 168 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 169 } else if (error = 170 iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 171 (char *)edst, &snpalen)) 172 goto bad; /* Not Resolved */ 173 /* If broadcasting on a simplex interface, loopback a copy */ 174 if (*edst & 1) 175 m->m_flags |= (M_BCAST|M_MCAST); 176 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 177 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 178 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 179 if (mcopy) { 180 eh = mtod(mcopy, struct ether_header *); 181 bcopy((caddr_t)edst, 182 (caddr_t)eh->ether_dhost, sizeof (edst)); 183 bcopy((caddr_t)ac->ac_enaddr, 184 (caddr_t)eh->ether_shost, sizeof (edst)); 185 } 186 } 187 M_PREPEND(m, 3, M_DONTWAIT); 188 if (m == NULL) 189 return (0); 190 etype = m->m_pkthdr.len; 191 l = mtod(m, struct llc *); 192 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 193 l->llc_control = LLC_UI; 194 IFDEBUG(D_ETHER) 195 int i; 196 printf("unoutput: sending pkt to: "); 197 for (i=0; i<6; i++) 198 printf("%x ", edst[i] & 0xff); 199 printf("\n"); 200 ENDDEBUG 201 } break; 202 #endif /* ISO */ 203 #ifdef LLC 204 /* case AF_NSAP: */ 205 case AF_CCITT: { 206 register struct sockaddr_dl *sdl = 207 (struct sockaddr_dl *) rt -> rt_gateway; 208 209 if (sdl && sdl->sdl_family == AF_LINK 210 && sdl->sdl_alen > 0) { 211 bcopy(LLADDR(sdl), (char *)edst, 212 sizeof(edst)); 213 } else goto bad; /* Not a link interface ? Funny ... */ 214 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 215 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 216 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 217 if (mcopy) { 218 eh = mtod(mcopy, struct ether_header *); 219 bcopy((caddr_t)edst, 220 (caddr_t)eh->ether_dhost, sizeof (edst)); 221 bcopy((caddr_t)ac->ac_enaddr, 222 (caddr_t)eh->ether_shost, sizeof (edst)); 223 } 224 } 225 etype = m->m_pkthdr.len; 226 #ifdef LLC_DEBUG 227 { 228 int i; 229 register struct llc *l = mtod(m, struct llc *); 230 231 printf("ether_output: sending LLC2 pkt to: "); 232 for (i=0; i<6; i++) 233 printf("%x ", edst[i] & 0xff); 234 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 235 etype & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, 236 l->llc_control & 0xff); 237 238 } 239 #endif /* LLC_DEBUG */ 240 } break; 241 #endif /* LLC */ 242 243 case AF_UNSPEC: 244 eh = (struct ether_header *)dst->sa_data; 245 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 246 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 247 etype = ntohs(eh->ether_type); 248 break; 249 250 default: 251 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 252 dst->sa_family); 253 senderr(EAFNOSUPPORT); 254 } 255 256 257 if (mcopy) 258 (void) looutput(ifp, mcopy, dst, rt); 259 /* 260 * Add local net header. If no space in first mbuf, 261 * allocate another. 262 */ 263 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 264 if (m == 0) 265 senderr(ENOBUFS); 266 eh = mtod(m, struct ether_header *); 267 etype = htons(etype); 268 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 269 sizeof(eh->ether_type)); 270 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 271 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 272 sizeof(eh->ether_shost)); 273 s = splimp(); 274 /* 275 * Queue message on interface, and start output if interface 276 * not yet active. 277 */ 278 if (IF_QFULL(&ifp->if_snd)) { 279 IF_DROP(&ifp->if_snd); 280 splx(s); 281 senderr(ENOBUFS); 282 } 283 ifp->if_obytes += m->m_pkthdr.len; 284 IF_ENQUEUE(&ifp->if_snd, m); 285 if ((ifp->if_flags & IFF_OACTIVE) == 0) 286 (*ifp->if_start)(ifp); 287 splx(s); 288 if (m->m_flags & M_MCAST) 289 ifp->if_omcasts++; 290 return (error); 291 292 bad: 293 if (m) 294 m_freem(m); 295 return (error); 296 } 297 298 /* 299 * Process a received Ethernet packet; 300 * the packet is in the mbuf chain m without 301 * the ether header, which is provided separately. 302 */ 303 void 304 ether_input(ifp, eh, m) 305 struct ifnet *ifp; 306 register struct ether_header *eh; 307 struct mbuf *m; 308 { 309 register struct ifqueue *inq; 310 register struct llc *l; 311 u_int16_t etype; 312 struct arpcom *ac = (struct arpcom *)ifp; 313 int s; 314 315 if ((ifp->if_flags & IFF_UP) == 0) { 316 m_freem(m); 317 return; 318 } 319 ifp->if_lastchange = time; 320 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 321 if (eh->ether_dhost[0] & 1) { 322 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 323 sizeof(etherbroadcastaddr)) == 0) 324 m->m_flags |= M_BCAST; 325 else 326 m->m_flags |= M_MCAST; 327 } 328 if (m->m_flags & (M_BCAST|M_MCAST)) 329 ifp->if_imcasts++; 330 331 etype = ntohs(eh->ether_type); 332 switch (etype) { 333 #ifdef INET 334 case ETHERTYPE_IP: 335 schednetisr(NETISR_IP); 336 inq = &ipintrq; 337 break; 338 339 case ETHERTYPE_ARP: 340 schednetisr(NETISR_ARP); 341 inq = &arpintrq; 342 break; 343 344 case ETHERTYPE_REVARP: 345 revarpinput(m); /* XXX queue? */ 346 return; 347 #endif 348 #ifdef NS 349 case ETHERTYPE_NS: 350 schednetisr(NETISR_NS); 351 inq = &nsintrq; 352 break; 353 354 #endif 355 default: 356 #if defined (ISO) || defined (LLC) 357 if (etype > ETHERMTU) 358 goto dropanyway; 359 l = mtod(m, struct llc *); 360 switch (l->llc_dsap) { 361 #ifdef ISO 362 case LLC_ISO_LSAP: 363 switch (l->llc_control) { 364 case LLC_UI: 365 /* LLC_UI_P forbidden in class 1 service */ 366 if ((l->llc_dsap == LLC_ISO_LSAP) && 367 (l->llc_ssap == LLC_ISO_LSAP)) { 368 /* LSAP for ISO */ 369 if (m->m_pkthdr.len > etype) 370 m_adj(m, etype - m->m_pkthdr.len); 371 m->m_data += 3; /* XXX */ 372 m->m_len -= 3; /* XXX */ 373 m->m_pkthdr.len -= 3; /* XXX */ 374 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 375 if (m == 0) 376 return; 377 *mtod(m, struct ether_header *) = *eh; 378 IFDEBUG(D_ETHER) 379 printf("clnp packet"); 380 ENDDEBUG 381 schednetisr(NETISR_ISO); 382 inq = &clnlintrq; 383 break; 384 } 385 goto dropanyway; 386 387 case LLC_XID: 388 case LLC_XID_P: 389 if(m->m_len < 6) 390 goto dropanyway; 391 l->llc_window = 0; 392 l->llc_fid = 9; 393 l->llc_class = 1; 394 l->llc_dsap = l->llc_ssap = 0; 395 /* Fall through to */ 396 case LLC_TEST: 397 case LLC_TEST_P: 398 { 399 struct sockaddr sa; 400 register struct ether_header *eh2; 401 int i; 402 u_char c = l->llc_dsap; 403 404 l->llc_dsap = l->llc_ssap; 405 l->llc_ssap = c; 406 if (m->m_flags & (M_BCAST | M_MCAST)) 407 bcopy((caddr_t)ac->ac_enaddr, 408 (caddr_t)eh->ether_dhost, 6); 409 sa.sa_family = AF_UNSPEC; 410 sa.sa_len = sizeof(sa); 411 eh2 = (struct ether_header *)sa.sa_data; 412 for (i = 0; i < 6; i++) { 413 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 414 eh2->ether_dhost[i] = 415 eh->ether_dhost[i] = eh->ether_shost[i]; 416 eh->ether_shost[i] = c; 417 } 418 ifp->if_output(ifp, m, &sa, NULL); 419 return; 420 } 421 default: 422 m_freem(m); 423 return; 424 } 425 break; 426 #endif /* ISO */ 427 #ifdef LLC 428 case LLC_X25_LSAP: 429 { 430 if (m->m_pkthdr.len > etype) 431 m_adj(m, etype - m->m_pkthdr.len); 432 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 433 if (m == 0) 434 return; 435 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 436 eh->ether_dhost, LLC_X25_LSAP, 6, 437 mtod(m, struct sdl_hdr *))) 438 panic("ETHER cons addr failure"); 439 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 440 #ifdef LLC_DEBUG 441 printf("llc packet\n"); 442 #endif /* LLC_DEBUG */ 443 schednetisr(NETISR_CCITT); 444 inq = &llcintrq; 445 break; 446 } 447 #endif /* LLC */ 448 dropanyway: 449 default: 450 m_freem(m); 451 return; 452 } 453 #else /* ISO || LLC */ 454 m_freem(m); 455 return; 456 #endif /* ISO || LLC */ 457 } 458 459 s = splimp(); 460 if (IF_QFULL(inq)) { 461 IF_DROP(inq); 462 m_freem(m); 463 } else 464 IF_ENQUEUE(inq, m); 465 splx(s); 466 } 467 468 /* 469 * Convert Ethernet address to printable (loggable) representation. 470 */ 471 static char digits[] = "0123456789abcdef"; 472 char * 473 ether_sprintf(ap) 474 register u_char *ap; 475 { 476 register i; 477 static char etherbuf[18]; 478 register char *cp = etherbuf; 479 480 for (i = 0; i < 6; i++) { 481 *cp++ = digits[*ap >> 4]; 482 *cp++ = digits[*ap++ & 0xf]; 483 *cp++ = ':'; 484 } 485 *--cp = 0; 486 return (etherbuf); 487 } 488 489 /* 490 * Perform common duties while attaching to interface list 491 */ 492 void 493 ether_ifattach(ifp) 494 register struct ifnet *ifp; 495 { 496 register struct ifaddr *ifa; 497 register struct sockaddr_dl *sdl; 498 499 ifp->if_type = IFT_ETHER; 500 ifp->if_addrlen = 6; 501 ifp->if_hdrlen = 14; 502 ifp->if_mtu = ETHERMTU; 503 ifp->if_output = ether_output; 504 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; 505 ifa = ifa->ifa_list.tqe_next) 506 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 507 sdl->sdl_family == AF_LINK) { 508 sdl->sdl_type = IFT_ETHER; 509 sdl->sdl_alen = ifp->if_addrlen; 510 bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr, 511 LLADDR(sdl), ifp->if_addrlen); 512 break; 513 } 514 LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs); 515 } 516 517 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 518 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 519 /* 520 * Add an Ethernet multicast address or range of addresses to the list for a 521 * given interface. 522 */ 523 int 524 ether_addmulti(ifr, ac) 525 struct ifreq *ifr; 526 register struct arpcom *ac; 527 { 528 register struct ether_multi *enm; 529 struct sockaddr_in *sin; 530 u_char addrlo[6]; 531 u_char addrhi[6]; 532 int s = splimp(); 533 534 switch (ifr->ifr_addr.sa_family) { 535 536 case AF_UNSPEC: 537 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 538 bcopy(addrlo, addrhi, 6); 539 break; 540 541 #ifdef INET 542 case AF_INET: 543 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 544 if (sin->sin_addr.s_addr == INADDR_ANY) { 545 /* 546 * An IP address of INADDR_ANY means listen to all 547 * of the Ethernet multicast addresses used for IP. 548 * (This is for the sake of IP multicast routers.) 549 */ 550 bcopy(ether_ipmulticast_min, addrlo, 6); 551 bcopy(ether_ipmulticast_max, addrhi, 6); 552 } 553 else { 554 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 555 bcopy(addrlo, addrhi, 6); 556 } 557 break; 558 #endif 559 560 default: 561 splx(s); 562 return (EAFNOSUPPORT); 563 } 564 565 /* 566 * Verify that we have valid Ethernet multicast addresses. 567 */ 568 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 569 splx(s); 570 return (EINVAL); 571 } 572 /* 573 * See if the address range is already in the list. 574 */ 575 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 576 if (enm != NULL) { 577 /* 578 * Found it; just increment the reference count. 579 */ 580 ++enm->enm_refcount; 581 splx(s); 582 return (0); 583 } 584 /* 585 * New address or range; malloc a new multicast record 586 * and link it into the interface's multicast list. 587 */ 588 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 589 if (enm == NULL) { 590 splx(s); 591 return (ENOBUFS); 592 } 593 bcopy(addrlo, enm->enm_addrlo, 6); 594 bcopy(addrhi, enm->enm_addrhi, 6); 595 enm->enm_ac = ac; 596 enm->enm_refcount = 1; 597 LIST_INSERT_HEAD(&ac->ac_multiaddrs, enm, enm_list); 598 ac->ac_multicnt++; 599 splx(s); 600 /* 601 * Return ENETRESET to inform the driver that the list has changed 602 * and its reception filter should be adjusted accordingly. 603 */ 604 return (ENETRESET); 605 } 606 607 /* 608 * Delete a multicast address record. 609 */ 610 int 611 ether_delmulti(ifr, ac) 612 struct ifreq *ifr; 613 register struct arpcom *ac; 614 { 615 register struct ether_multi *enm; 616 register struct ether_multi **p; 617 struct sockaddr_in *sin; 618 u_char addrlo[6]; 619 u_char addrhi[6]; 620 int s = splimp(); 621 622 switch (ifr->ifr_addr.sa_family) { 623 624 case AF_UNSPEC: 625 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 626 bcopy(addrlo, addrhi, 6); 627 break; 628 629 #ifdef INET 630 case AF_INET: 631 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 632 if (sin->sin_addr.s_addr == INADDR_ANY) { 633 /* 634 * An IP address of INADDR_ANY means stop listening 635 * to the range of Ethernet multicast addresses used 636 * for IP. 637 */ 638 bcopy(ether_ipmulticast_min, addrlo, 6); 639 bcopy(ether_ipmulticast_max, addrhi, 6); 640 } 641 else { 642 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 643 bcopy(addrlo, addrhi, 6); 644 } 645 break; 646 #endif 647 648 default: 649 splx(s); 650 return (EAFNOSUPPORT); 651 } 652 653 /* 654 * Look up the address in our list. 655 */ 656 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 657 if (enm == NULL) { 658 splx(s); 659 return (ENXIO); 660 } 661 if (--enm->enm_refcount != 0) { 662 /* 663 * Still some claims to this record. 664 */ 665 splx(s); 666 return (0); 667 } 668 /* 669 * No remaining claims to this record; unlink and free it. 670 */ 671 LIST_REMOVE(enm, enm_list); 672 free(enm, M_IFMADDR); 673 ac->ac_multicnt--; 674 splx(s); 675 /* 676 * Return ENETRESET to inform the driver that the list has changed 677 * and its reception filter should be adjusted accordingly. 678 */ 679 return (ENETRESET); 680 } 681
Indexes created Tue Sep 23 02:09:52 GMT 2025