if_ethersubr.c revision 1.9
1 /* $NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd 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 #ifdef INET 59 #include <netinet/in.h> 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 extern struct ifnet loif; 87 #define senderr(e) { error = (e); goto bad;} 88 89 /* 90 * Ethernet output routine. 91 * Encapsulate a packet of type family for the local net. 92 * Use trailer local net encapsulation if enough data in first 93 * packet leaves a multiple of 512 bytes of data in remainder. 94 * Assumes that ifp is actually pointer to arpcom structure. 95 */ 96 int 97 ether_output(ifp, m0, dst, rt0) 98 register struct ifnet *ifp; 99 struct mbuf *m0; 100 struct sockaddr *dst; 101 struct rtentry *rt0; 102 { 103 u_short etype; 104 int s, error = 0; 105 u_char edst[6]; 106 register struct mbuf *m = m0; 107 register struct rtentry *rt; 108 struct mbuf *mcopy = (struct mbuf *)0; 109 register struct ether_header *eh; 110 int off, len = m->m_pkthdr.len; 111 struct arpcom *ac = (struct arpcom *)ifp; 112 113 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 114 senderr(ENETDOWN); 115 ifp->if_lastchange = time; 116 if (rt = rt0) { 117 if ((rt->rt_flags & RTF_UP) == 0) { 118 if (rt0 = rt = rtalloc1(dst, 1)) 119 rt->rt_refcnt--; 120 else 121 senderr(EHOSTUNREACH); 122 } 123 if (rt->rt_flags & RTF_GATEWAY) { 124 if (rt->rt_gwroute == 0) 125 goto lookup; 126 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 127 rtfree(rt); rt = rt0; 128 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 129 if ((rt = rt->rt_gwroute) == 0) 130 senderr(EHOSTUNREACH); 131 } 132 } 133 if (rt->rt_flags & RTF_REJECT) 134 if (rt->rt_rmx.rmx_expire == 0 || 135 time.tv_sec < rt->rt_rmx.rmx_expire) 136 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 137 } 138 switch (dst->sa_family) { 139 140 #ifdef INET 141 case AF_INET: 142 if (!arpresolve(ac, rt, m, dst, edst)) 143 return (0); /* if not yet resolved */ 144 /* If broadcasting on a simplex interface, loopback a copy */ 145 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 146 mcopy = m_copy(m, 0, (int)M_COPYALL); 147 off = m->m_pkthdr.len - m->m_len; 148 etype = ETHERTYPE_IP; 149 break; 150 #endif 151 #ifdef NS 152 case AF_NS: 153 etype = ETHERTYPE_NS; 154 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 155 (caddr_t)edst, sizeof (edst)); 156 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 157 return (looutput(ifp, m, dst, rt)); 158 /* If broadcasting on a simplex interface, loopback a copy */ 159 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 160 mcopy = m_copy(m, 0, (int)M_COPYALL); 161 break; 162 #endif 163 #ifdef ISO 164 case AF_ISO: { 165 int snpalen; 166 struct llc *l; 167 register struct sockaddr_dl *sdl; 168 169 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 170 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 171 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 172 } else if (error = 173 iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 174 (char *)edst, &snpalen)) 175 goto bad; /* Not Resolved */ 176 /* If broadcasting on a simplex interface, loopback a copy */ 177 if (*edst & 1) 178 m->m_flags |= (M_BCAST|M_MCAST); 179 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 180 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 181 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 182 if (mcopy) { 183 eh = mtod(mcopy, struct ether_header *); 184 bcopy((caddr_t)edst, 185 (caddr_t)eh->ether_dhost, sizeof (edst)); 186 bcopy((caddr_t)ac->ac_enaddr, 187 (caddr_t)eh->ether_shost, sizeof (edst)); 188 } 189 } 190 M_PREPEND(m, 3, M_DONTWAIT); 191 if (m == NULL) 192 return (0); 193 etype = m->m_pkthdr.len; 194 l = mtod(m, struct llc *); 195 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 196 l->llc_control = LLC_UI; 197 len += 3; 198 IFDEBUG(D_ETHER) 199 int i; 200 printf("unoutput: sending pkt to: "); 201 for (i=0; i<6; i++) 202 printf("%x ", edst[i] & 0xff); 203 printf("\n"); 204 ENDDEBUG 205 } break; 206 #endif /* ISO */ 207 #ifdef LLC 208 /* case AF_NSAP: */ 209 case AF_CCITT: { 210 register struct sockaddr_dl *sdl = 211 (struct sockaddr_dl *) rt -> rt_gateway; 212 213 if (sdl && sdl->sdl_family == AF_LINK 214 && sdl->sdl_alen > 0) { 215 bcopy(LLADDR(sdl), (char *)edst, 216 sizeof(edst)); 217 } else goto bad; /* Not a link interface ? Funny ... */ 218 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 219 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 220 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 221 if (mcopy) { 222 eh = mtod(mcopy, struct ether_header *); 223 bcopy((caddr_t)edst, 224 (caddr_t)eh->ether_dhost, sizeof (edst)); 225 bcopy((caddr_t)ac->ac_enaddr, 226 (caddr_t)eh->ether_shost, sizeof (edst)); 227 } 228 } 229 etype = m->m_pkthdr.len; 230 #ifdef LLC_DEBUG 231 { 232 int i; 233 register struct llc *l = mtod(m, struct llc *); 234 235 printf("ether_output: sending LLC2 pkt to: "); 236 for (i=0; i<6; i++) 237 printf("%x ", edst[i] & 0xff); 238 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 239 etype & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, 240 l->llc_control & 0xff); 241 242 } 243 #endif /* LLC_DEBUG */ 244 } break; 245 #endif /* LLC */ 246 247 case AF_UNSPEC: 248 eh = (struct ether_header *)dst->sa_data; 249 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 250 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 251 etype = ntohs(eh->ether_type); 252 break; 253 254 default: 255 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 256 dst->sa_family); 257 senderr(EAFNOSUPPORT); 258 } 259 260 261 if (mcopy) 262 (void) looutput(ifp, mcopy, dst, rt); 263 /* 264 * Add local net header. If no space in first mbuf, 265 * allocate another. 266 */ 267 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 268 if (m == 0) 269 senderr(ENOBUFS); 270 eh = mtod(m, struct ether_header *); 271 etype = htons(etype); 272 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 273 sizeof(eh->ether_type)); 274 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 275 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 276 sizeof(eh->ether_shost)); 277 s = splimp(); 278 /* 279 * Queue message on interface, and start output if interface 280 * not yet active. 281 */ 282 if (IF_QFULL(&ifp->if_snd)) { 283 IF_DROP(&ifp->if_snd); 284 splx(s); 285 senderr(ENOBUFS); 286 } 287 IF_ENQUEUE(&ifp->if_snd, m); 288 if ((ifp->if_flags & IFF_OACTIVE) == 0) 289 (*ifp->if_start)(ifp); 290 splx(s); 291 ifp->if_obytes += len + sizeof (struct ether_header); 292 if (m->m_flags & M_MCAST) 293 ifp->if_omcasts++; 294 return (error); 295 296 bad: 297 if (m) 298 m_freem(m); 299 return (error); 300 } 301 302 /* 303 * Process a received Ethernet packet; 304 * the packet is in the mbuf chain m without 305 * the ether header, which is provided separately. 306 */ 307 void 308 ether_input(ifp, eh, m) 309 struct ifnet *ifp; 310 register struct ether_header *eh; 311 struct mbuf *m; 312 { 313 register struct ifqueue *inq; 314 register struct llc *l; 315 u_short etype; 316 struct arpcom *ac = (struct arpcom *)ifp; 317 int s; 318 319 if ((ifp->if_flags & IFF_UP) == 0) { 320 m_freem(m); 321 return; 322 } 323 ifp->if_lastchange = time; 324 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 325 if (eh->ether_dhost[0] & 1) { 326 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 327 sizeof(etherbroadcastaddr)) == 0) 328 m->m_flags |= M_BCAST; 329 else 330 m->m_flags |= M_MCAST; 331 } 332 if (m->m_flags & (M_BCAST|M_MCAST)) 333 ifp->if_imcasts++; 334 335 etype = ntohs(eh->ether_type); 336 switch (etype) { 337 #ifdef INET 338 case ETHERTYPE_IP: 339 schednetisr(NETISR_IP); 340 inq = &ipintrq; 341 break; 342 343 case ETHERTYPE_ARP: 344 schednetisr(NETISR_ARP); 345 inq = &arpintrq; 346 break; 347 348 case ETHERTYPE_REVARP: 349 revarpinput(m); /* XXX queue? */ 350 return; 351 #endif 352 #ifdef NS 353 case ETHERTYPE_NS: 354 schednetisr(NETISR_NS); 355 inq = &nsintrq; 356 break; 357 358 #endif 359 default: 360 #if defined (ISO) || defined (LLC) 361 if (eh->ether_type > ETHERMTU) 362 goto dropanyway; 363 l = mtod(m, struct llc *); 364 switch (l->llc_dsap) { 365 #ifdef ISO 366 case LLC_ISO_LSAP: 367 switch (l->llc_control) { 368 case LLC_UI: 369 /* LLC_UI_P forbidden in class 1 service */ 370 if ((l->llc_dsap == LLC_ISO_LSAP) && 371 (l->llc_ssap == LLC_ISO_LSAP)) { 372 /* LSAP for ISO */ 373 if (m->m_pkthdr.len > eh->ether_type) 374 m_adj(m, eh->ether_type - m->m_pkthdr.len); 375 m->m_data += 3; /* XXX */ 376 m->m_len -= 3; /* XXX */ 377 m->m_pkthdr.len -= 3; /* XXX */ 378 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 379 if (m == 0) 380 return; 381 *mtod(m, struct ether_header *) = *eh; 382 IFDEBUG(D_ETHER) 383 printf("clnp packet"); 384 ENDDEBUG 385 schednetisr(NETISR_ISO); 386 inq = &clnlintrq; 387 break; 388 } 389 goto dropanyway; 390 391 case LLC_XID: 392 case LLC_XID_P: 393 if(m->m_len < 6) 394 goto dropanyway; 395 l->llc_window = 0; 396 l->llc_fid = 9; 397 l->llc_class = 1; 398 l->llc_dsap = l->llc_ssap = 0; 399 /* Fall through to */ 400 case LLC_TEST: 401 case LLC_TEST_P: 402 { 403 struct sockaddr sa; 404 register struct ether_header *eh2; 405 int i; 406 u_char c = l->llc_dsap; 407 408 l->llc_dsap = l->llc_ssap; 409 l->llc_ssap = c; 410 if (m->m_flags & (M_BCAST | M_MCAST)) 411 bcopy((caddr_t)ac->ac_enaddr, 412 (caddr_t)eh->ether_dhost, 6); 413 sa.sa_family = AF_UNSPEC; 414 sa.sa_len = sizeof(sa); 415 eh2 = (struct ether_header *)sa.sa_data; 416 for (i = 0; i < 6; i++) { 417 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 418 eh2->ether_dhost[i] = 419 eh->ether_dhost[i] = eh->ether_shost[i]; 420 eh->ether_shost[i] = c; 421 } 422 ifp->if_output(ifp, m, &sa, NULL); 423 return; 424 } 425 default: 426 m_freem(m); 427 return; 428 } 429 break; 430 #endif /* ISO */ 431 #ifdef LLC 432 case LLC_X25_LSAP: 433 { 434 if (m->m_pkthdr.len > eh->ether_type) 435 m_adj(m, eh->ether_type - m->m_pkthdr.len); 436 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 437 if (m == 0) 438 return; 439 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 440 eh->ether_dhost, LLC_X25_LSAP, 6, 441 mtod(m, struct sdl_hdr *))) 442 panic("ETHER cons addr failure"); 443 mtod(m, struct sdl_hdr *)->sdlhdr_len = eh->ether_type; 444 #ifdef LLC_DEBUG 445 printf("llc packet\n"); 446 #endif /* LLC_DEBUG */ 447 schednetisr(NETISR_CCITT); 448 inq = &llcintrq; 449 break; 450 } 451 #endif /* LLC */ 452 dropanyway: 453 default: 454 m_freem(m); 455 return; 456 } 457 #else /* ISO || LLC */ 458 m_freem(m); 459 return; 460 #endif /* ISO || LLC */ 461 } 462 463 s = splimp(); 464 if (IF_QFULL(inq)) { 465 IF_DROP(inq); 466 m_freem(m); 467 } else 468 IF_ENQUEUE(inq, m); 469 splx(s); 470 } 471 472 /* 473 * Convert Ethernet address to printable (loggable) representation. 474 */ 475 static char digits[] = "0123456789abcdef"; 476 char * 477 ether_sprintf(ap) 478 register u_char *ap; 479 { 480 register i; 481 static char etherbuf[18]; 482 register char *cp = etherbuf; 483 484 for (i = 0; i < 6; i++) { 485 *cp++ = digits[*ap >> 4]; 486 *cp++ = digits[*ap++ & 0xf]; 487 *cp++ = ':'; 488 } 489 *--cp = 0; 490 return (etherbuf); 491 } 492 493 /* 494 * Perform common duties while attaching to interface list 495 */ 496 void 497 ether_ifattach(ifp) 498 register struct ifnet *ifp; 499 { 500 register struct ifaddr *ifa; 501 register struct sockaddr_dl *sdl; 502 503 ifp->if_type = IFT_ETHER; 504 ifp->if_addrlen = 6; 505 ifp->if_hdrlen = 14; 506 ifp->if_mtu = ETHERMTU; 507 for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 508 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 509 sdl->sdl_family == AF_LINK) { 510 sdl->sdl_type = IFT_ETHER; 511 sdl->sdl_alen = ifp->if_addrlen; 512 bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr, 513 LLADDR(sdl), ifp->if_addrlen); 514 break; 515 } 516 } 517 518 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 519 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 520 /* 521 * Add an Ethernet multicast address or range of addresses to the list for a 522 * given interface. 523 */ 524 int 525 ether_addmulti(ifr, ac) 526 struct ifreq *ifr; 527 register struct arpcom *ac; 528 { 529 register struct ether_multi *enm; 530 struct sockaddr_in *sin; 531 u_char addrlo[6]; 532 u_char addrhi[6]; 533 int s = splimp(); 534 535 switch (ifr->ifr_addr.sa_family) { 536 537 case AF_UNSPEC: 538 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 539 bcopy(addrlo, addrhi, 6); 540 break; 541 542 #ifdef INET 543 case AF_INET: 544 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 545 if (sin->sin_addr.s_addr == INADDR_ANY) { 546 /* 547 * An IP address of INADDR_ANY means listen to all 548 * of the Ethernet multicast addresses used for IP. 549 * (This is for the sake of IP multicast routers.) 550 */ 551 bcopy(ether_ipmulticast_min, addrlo, 6); 552 bcopy(ether_ipmulticast_max, addrhi, 6); 553 } 554 else { 555 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 556 bcopy(addrlo, addrhi, 6); 557 } 558 break; 559 #endif 560 561 default: 562 splx(s); 563 return (EAFNOSUPPORT); 564 } 565 566 /* 567 * Verify that we have valid Ethernet multicast addresses. 568 */ 569 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 570 splx(s); 571 return (EINVAL); 572 } 573 /* 574 * See if the address range is already in the list. 575 */ 576 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 577 if (enm != NULL) { 578 /* 579 * Found it; just increment the reference count. 580 */ 581 ++enm->enm_refcount; 582 splx(s); 583 return (0); 584 } 585 /* 586 * New address or range; malloc a new multicast record 587 * and link it into the interface's multicast list. 588 */ 589 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 590 if (enm == NULL) { 591 splx(s); 592 return (ENOBUFS); 593 } 594 bcopy(addrlo, enm->enm_addrlo, 6); 595 bcopy(addrhi, enm->enm_addrhi, 6); 596 enm->enm_ac = ac; 597 enm->enm_refcount = 1; 598 enm->enm_next = ac->ac_multiaddrs; 599 ac->ac_multiaddrs = enm; 600 ac->ac_multicnt++; 601 splx(s); 602 /* 603 * Return ENETRESET to inform the driver that the list has changed 604 * and its reception filter should be adjusted accordingly. 605 */ 606 return (ENETRESET); 607 } 608 609 /* 610 * Delete a multicast address record. 611 */ 612 int 613 ether_delmulti(ifr, ac) 614 struct ifreq *ifr; 615 register struct arpcom *ac; 616 { 617 register struct ether_multi *enm; 618 register struct ether_multi **p; 619 struct sockaddr_in *sin; 620 u_char addrlo[6]; 621 u_char addrhi[6]; 622 int s = splimp(); 623 624 switch (ifr->ifr_addr.sa_family) { 625 626 case AF_UNSPEC: 627 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 628 bcopy(addrlo, addrhi, 6); 629 break; 630 631 #ifdef INET 632 case AF_INET: 633 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 634 if (sin->sin_addr.s_addr == INADDR_ANY) { 635 /* 636 * An IP address of INADDR_ANY means stop listening 637 * to the range of Ethernet multicast addresses used 638 * for IP. 639 */ 640 bcopy(ether_ipmulticast_min, addrlo, 6); 641 bcopy(ether_ipmulticast_max, addrhi, 6); 642 } 643 else { 644 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 645 bcopy(addrlo, addrhi, 6); 646 } 647 break; 648 #endif 649 650 default: 651 splx(s); 652 return (EAFNOSUPPORT); 653 } 654 655 /* 656 * Look up the address in our list. 657 */ 658 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 659 if (enm == NULL) { 660 splx(s); 661 return (ENXIO); 662 } 663 if (--enm->enm_refcount != 0) { 664 /* 665 * Still some claims to this record. 666 */ 667 splx(s); 668 return (0); 669 } 670 /* 671 * No remaining claims to this record; unlink and free it. 672 */ 673 for (p = &enm->enm_ac->ac_multiaddrs; 674 *p != enm; 675 p = &(*p)->enm_next) 676 continue; 677 *p = (*p)->enm_next; 678 free(enm, M_IFMADDR); 679 ac->ac_multicnt--; 680 splx(s); 681 /* 682 * Return ENETRESET to inform the driver that the list has changed 683 * and its reception filter should be adjusted accordingly. 684 */ 685 return (ENETRESET); 686 } 687
Indexes created Tue Sep 23 02:09:52 GMT 2025