if_ethersubr.c revision 1.16
1 /* $NetBSD: if_ethersubr.c,v 1.16 1995/12/24 03:12:29 mycroft 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 * Assumes that ifp is actually pointer to arpcom structure. 92 */ 93 int 94 ether_output(ifp, m0, dst, rt0) 95 register struct ifnet *ifp; 96 struct mbuf *m0; 97 struct sockaddr *dst; 98 struct rtentry *rt0; 99 { 100 u_int16_t etype; 101 int s, error = 0; 102 u_char edst[6]; 103 register struct mbuf *m = m0; 104 register struct rtentry *rt; 105 struct mbuf *mcopy = (struct mbuf *)0; 106 register struct ether_header *eh; 107 struct arpcom *ac = (struct arpcom *)ifp; 108 109 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 110 senderr(ENETDOWN); 111 ifp->if_lastchange = time; 112 if (rt = rt0) { 113 if ((rt->rt_flags & RTF_UP) == 0) { 114 if (rt0 = rt = rtalloc1(dst, 1)) 115 rt->rt_refcnt--; 116 else 117 senderr(EHOSTUNREACH); 118 } 119 if (rt->rt_flags & RTF_GATEWAY) { 120 if (rt->rt_gwroute == 0) 121 goto lookup; 122 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 123 rtfree(rt); rt = rt0; 124 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 125 if ((rt = rt->rt_gwroute) == 0) 126 senderr(EHOSTUNREACH); 127 } 128 } 129 if (rt->rt_flags & RTF_REJECT) 130 if (rt->rt_rmx.rmx_expire == 0 || 131 time.tv_sec < rt->rt_rmx.rmx_expire) 132 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 133 } 134 switch (dst->sa_family) { 135 136 #ifdef INET 137 case AF_INET: 138 if (!arpresolve(ac, rt, m, dst, edst)) 139 return (0); /* if not yet resolved */ 140 /* If broadcasting on a simplex interface, loopback a copy */ 141 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 142 mcopy = m_copy(m, 0, (int)M_COPYALL); 143 etype = ETHERTYPE_IP; 144 break; 145 #endif 146 #ifdef NS 147 case AF_NS: 148 etype = ETHERTYPE_NS; 149 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 150 (caddr_t)edst, sizeof (edst)); 151 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 152 return (looutput(ifp, m, dst, rt)); 153 /* If broadcasting on a simplex interface, loopback a copy */ 154 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 155 mcopy = m_copy(m, 0, (int)M_COPYALL); 156 break; 157 #endif 158 #ifdef ISO 159 case AF_ISO: { 160 int snpalen; 161 struct llc *l; 162 register struct sockaddr_dl *sdl; 163 164 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 165 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 166 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 167 } else if (error = 168 iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 169 (char *)edst, &snpalen)) 170 goto bad; /* Not Resolved */ 171 /* If broadcasting on a simplex interface, loopback a copy */ 172 if (*edst & 1) 173 m->m_flags |= (M_BCAST|M_MCAST); 174 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 175 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 176 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 177 if (mcopy) { 178 eh = mtod(mcopy, struct ether_header *); 179 bcopy((caddr_t)edst, 180 (caddr_t)eh->ether_dhost, sizeof (edst)); 181 bcopy((caddr_t)ac->ac_enaddr, 182 (caddr_t)eh->ether_shost, sizeof (edst)); 183 } 184 } 185 M_PREPEND(m, 3, M_DONTWAIT); 186 if (m == NULL) 187 return (0); 188 etype = m->m_pkthdr.len; 189 l = mtod(m, struct llc *); 190 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 191 l->llc_control = LLC_UI; 192 IFDEBUG(D_ETHER) 193 int i; 194 printf("unoutput: sending pkt to: "); 195 for (i=0; i<6; i++) 196 printf("%x ", edst[i] & 0xff); 197 printf("\n"); 198 ENDDEBUG 199 } break; 200 #endif /* ISO */ 201 #ifdef LLC 202 /* case AF_NSAP: */ 203 case AF_CCITT: { 204 register struct sockaddr_dl *sdl = 205 (struct sockaddr_dl *) rt -> rt_gateway; 206 207 if (sdl && sdl->sdl_family == AF_LINK 208 && sdl->sdl_alen > 0) { 209 bcopy(LLADDR(sdl), (char *)edst, 210 sizeof(edst)); 211 } else goto bad; /* Not a link interface ? Funny ... */ 212 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 213 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 214 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 215 if (mcopy) { 216 eh = mtod(mcopy, struct ether_header *); 217 bcopy((caddr_t)edst, 218 (caddr_t)eh->ether_dhost, sizeof (edst)); 219 bcopy((caddr_t)ac->ac_enaddr, 220 (caddr_t)eh->ether_shost, sizeof (edst)); 221 } 222 } 223 etype = m->m_pkthdr.len; 224 #ifdef LLC_DEBUG 225 { 226 int i; 227 register struct llc *l = mtod(m, struct llc *); 228 229 printf("ether_output: sending LLC2 pkt to: "); 230 for (i=0; i<6; i++) 231 printf("%x ", edst[i] & 0xff); 232 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 233 etype & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, 234 l->llc_control & 0xff); 235 236 } 237 #endif /* LLC_DEBUG */ 238 } break; 239 #endif /* LLC */ 240 241 case AF_UNSPEC: 242 eh = (struct ether_header *)dst->sa_data; 243 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 244 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 245 etype = ntohs(eh->ether_type); 246 break; 247 248 default: 249 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, 250 dst->sa_family); 251 senderr(EAFNOSUPPORT); 252 } 253 254 if (mcopy) 255 (void) looutput(ifp, mcopy, dst, rt); 256 257 /* 258 * Add local net header. If no space in first mbuf, 259 * allocate another. 260 */ 261 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 262 if (m == 0) 263 senderr(ENOBUFS); 264 eh = mtod(m, struct ether_header *); 265 etype = htons(etype); 266 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 267 sizeof(eh->ether_type)); 268 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 269 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, 270 sizeof(eh->ether_shost)); 271 s = splimp(); 272 /* 273 * Queue message on interface, and start output if interface 274 * not yet active. 275 */ 276 if (IF_QFULL(&ifp->if_snd)) { 277 IF_DROP(&ifp->if_snd); 278 splx(s); 279 senderr(ENOBUFS); 280 } 281 ifp->if_obytes += m->m_pkthdr.len; 282 IF_ENQUEUE(&ifp->if_snd, m); 283 if ((ifp->if_flags & IFF_OACTIVE) == 0) 284 (*ifp->if_start)(ifp); 285 splx(s); 286 if (m->m_flags & M_MCAST) 287 ifp->if_omcasts++; 288 return (error); 289 290 bad: 291 if (m) 292 m_freem(m); 293 return (error); 294 } 295 296 /* 297 * Process a received Ethernet packet; 298 * the packet is in the mbuf chain m without 299 * the ether header, which is provided separately. 300 */ 301 void 302 ether_input(ifp, eh, m) 303 struct ifnet *ifp; 304 register struct ether_header *eh; 305 struct mbuf *m; 306 { 307 register struct ifqueue *inq; 308 register struct llc *l; 309 u_int16_t etype; 310 struct arpcom *ac = (struct arpcom *)ifp; 311 int s; 312 313 if ((ifp->if_flags & IFF_UP) == 0) { 314 m_freem(m); 315 return; 316 } 317 ifp->if_lastchange = time; 318 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 319 if (eh->ether_dhost[0] & 1) { 320 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 321 sizeof(etherbroadcastaddr)) == 0) 322 m->m_flags |= M_BCAST; 323 else 324 m->m_flags |= M_MCAST; 325 } 326 if (m->m_flags & (M_BCAST|M_MCAST)) 327 ifp->if_imcasts++; 328 329 etype = ntohs(eh->ether_type); 330 switch (etype) { 331 #ifdef INET 332 case ETHERTYPE_IP: 333 schednetisr(NETISR_IP); 334 inq = &ipintrq; 335 break; 336 337 case ETHERTYPE_ARP: 338 schednetisr(NETISR_ARP); 339 inq = &arpintrq; 340 break; 341 342 case ETHERTYPE_REVARP: 343 revarpinput(m); /* XXX queue? */ 344 return; 345 #endif 346 #ifdef NS 347 case ETHERTYPE_NS: 348 schednetisr(NETISR_NS); 349 inq = &nsintrq; 350 break; 351 352 #endif 353 default: 354 #if defined (ISO) || defined (LLC) 355 if (etype > ETHERMTU) 356 goto dropanyway; 357 l = mtod(m, struct llc *); 358 switch (l->llc_dsap) { 359 #ifdef ISO 360 case LLC_ISO_LSAP: 361 switch (l->llc_control) { 362 case LLC_UI: 363 /* LLC_UI_P forbidden in class 1 service */ 364 if ((l->llc_dsap == LLC_ISO_LSAP) && 365 (l->llc_ssap == LLC_ISO_LSAP)) { 366 /* LSAP for ISO */ 367 if (m->m_pkthdr.len > etype) 368 m_adj(m, etype - m->m_pkthdr.len); 369 m->m_data += 3; /* XXX */ 370 m->m_len -= 3; /* XXX */ 371 m->m_pkthdr.len -= 3; /* XXX */ 372 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 373 if (m == 0) 374 return; 375 *mtod(m, struct ether_header *) = *eh; 376 IFDEBUG(D_ETHER) 377 printf("clnp packet"); 378 ENDDEBUG 379 schednetisr(NETISR_ISO); 380 inq = &clnlintrq; 381 break; 382 } 383 goto dropanyway; 384 385 case LLC_XID: 386 case LLC_XID_P: 387 if(m->m_len < 6) 388 goto dropanyway; 389 l->llc_window = 0; 390 l->llc_fid = 9; 391 l->llc_class = 1; 392 l->llc_dsap = l->llc_ssap = 0; 393 /* Fall through to */ 394 case LLC_TEST: 395 case LLC_TEST_P: 396 { 397 struct sockaddr sa; 398 register struct ether_header *eh2; 399 int i; 400 u_char c = l->llc_dsap; 401 402 l->llc_dsap = l->llc_ssap; 403 l->llc_ssap = c; 404 if (m->m_flags & (M_BCAST | M_MCAST)) 405 bcopy((caddr_t)ac->ac_enaddr, 406 (caddr_t)eh->ether_dhost, 6); 407 sa.sa_family = AF_UNSPEC; 408 sa.sa_len = sizeof(sa); 409 eh2 = (struct ether_header *)sa.sa_data; 410 for (i = 0; i < 6; i++) { 411 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 412 eh2->ether_dhost[i] = 413 eh->ether_dhost[i] = eh->ether_shost[i]; 414 eh->ether_shost[i] = c; 415 } 416 ifp->if_output(ifp, m, &sa, NULL); 417 return; 418 } 419 default: 420 m_freem(m); 421 return; 422 } 423 break; 424 #endif /* ISO */ 425 #ifdef LLC 426 case LLC_X25_LSAP: 427 { 428 if (m->m_pkthdr.len > etype) 429 m_adj(m, etype - m->m_pkthdr.len); 430 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 431 if (m == 0) 432 return; 433 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 434 eh->ether_dhost, LLC_X25_LSAP, 6, 435 mtod(m, struct sdl_hdr *))) 436 panic("ETHER cons addr failure"); 437 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 438 #ifdef LLC_DEBUG 439 printf("llc packet\n"); 440 #endif /* LLC_DEBUG */ 441 schednetisr(NETISR_CCITT); 442 inq = &llcintrq; 443 break; 444 } 445 #endif /* LLC */ 446 dropanyway: 447 default: 448 m_freem(m); 449 return; 450 } 451 #else /* ISO || LLC */ 452 m_freem(m); 453 return; 454 #endif /* ISO || LLC */ 455 } 456 457 s = splimp(); 458 if (IF_QFULL(inq)) { 459 IF_DROP(inq); 460 m_freem(m); 461 } else 462 IF_ENQUEUE(inq, m); 463 splx(s); 464 } 465 466 /* 467 * Convert Ethernet address to printable (loggable) representation. 468 */ 469 static char digits[] = "0123456789abcdef"; 470 char * 471 ether_sprintf(ap) 472 register u_char *ap; 473 { 474 register i; 475 static char etherbuf[18]; 476 register char *cp = etherbuf; 477 478 for (i = 0; i < 6; i++) { 479 *cp++ = digits[*ap >> 4]; 480 *cp++ = digits[*ap++ & 0xf]; 481 *cp++ = ':'; 482 } 483 *--cp = 0; 484 return (etherbuf); 485 } 486 487 /* 488 * Perform common duties while attaching to interface list 489 */ 490 void 491 ether_ifattach(ifp) 492 register struct ifnet *ifp; 493 { 494 register struct ifaddr *ifa; 495 register struct sockaddr_dl *sdl; 496 497 ifp->if_type = IFT_ETHER; 498 ifp->if_addrlen = 6; 499 ifp->if_hdrlen = 14; 500 ifp->if_mtu = ETHERMTU; 501 ifp->if_output = ether_output; 502 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; 503 ifa = ifa->ifa_list.tqe_next) 504 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) && 505 sdl->sdl_family == AF_LINK) { 506 sdl->sdl_type = IFT_ETHER; 507 sdl->sdl_alen = ifp->if_addrlen; 508 bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr, 509 LLADDR(sdl), ifp->if_addrlen); 510 break; 511 } 512 LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs); 513 } 514 515 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 516 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 517 /* 518 * Add an Ethernet multicast address or range of addresses to the list for a 519 * given interface. 520 */ 521 int 522 ether_addmulti(ifr, ac) 523 struct ifreq *ifr; 524 register struct arpcom *ac; 525 { 526 register struct ether_multi *enm; 527 struct sockaddr_in *sin; 528 u_char addrlo[6]; 529 u_char addrhi[6]; 530 int s = splimp(); 531 532 switch (ifr->ifr_addr.sa_family) { 533 534 case AF_UNSPEC: 535 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 536 bcopy(addrlo, addrhi, 6); 537 break; 538 539 #ifdef INET 540 case AF_INET: 541 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 542 if (sin->sin_addr.s_addr == INADDR_ANY) { 543 /* 544 * An IP address of INADDR_ANY means listen to all 545 * of the Ethernet multicast addresses used for IP. 546 * (This is for the sake of IP multicast routers.) 547 */ 548 bcopy(ether_ipmulticast_min, addrlo, 6); 549 bcopy(ether_ipmulticast_max, addrhi, 6); 550 } 551 else { 552 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 553 bcopy(addrlo, addrhi, 6); 554 } 555 break; 556 #endif 557 558 default: 559 splx(s); 560 return (EAFNOSUPPORT); 561 } 562 563 /* 564 * Verify that we have valid Ethernet multicast addresses. 565 */ 566 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 567 splx(s); 568 return (EINVAL); 569 } 570 /* 571 * See if the address range is already in the list. 572 */ 573 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 574 if (enm != NULL) { 575 /* 576 * Found it; just increment the reference count. 577 */ 578 ++enm->enm_refcount; 579 splx(s); 580 return (0); 581 } 582 /* 583 * New address or range; malloc a new multicast record 584 * and link it into the interface's multicast list. 585 */ 586 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 587 if (enm == NULL) { 588 splx(s); 589 return (ENOBUFS); 590 } 591 bcopy(addrlo, enm->enm_addrlo, 6); 592 bcopy(addrhi, enm->enm_addrhi, 6); 593 enm->enm_ac = ac; 594 enm->enm_refcount = 1; 595 LIST_INSERT_HEAD(&ac->ac_multiaddrs, enm, enm_list); 596 ac->ac_multicnt++; 597 splx(s); 598 /* 599 * Return ENETRESET to inform the driver that the list has changed 600 * and its reception filter should be adjusted accordingly. 601 */ 602 return (ENETRESET); 603 } 604 605 /* 606 * Delete a multicast address record. 607 */ 608 int 609 ether_delmulti(ifr, ac) 610 struct ifreq *ifr; 611 register struct arpcom *ac; 612 { 613 register struct ether_multi *enm; 614 register struct ether_multi **p; 615 struct sockaddr_in *sin; 616 u_char addrlo[6]; 617 u_char addrhi[6]; 618 int s = splimp(); 619 620 switch (ifr->ifr_addr.sa_family) { 621 622 case AF_UNSPEC: 623 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 624 bcopy(addrlo, addrhi, 6); 625 break; 626 627 #ifdef INET 628 case AF_INET: 629 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 630 if (sin->sin_addr.s_addr == INADDR_ANY) { 631 /* 632 * An IP address of INADDR_ANY means stop listening 633 * to the range of Ethernet multicast addresses used 634 * for IP. 635 */ 636 bcopy(ether_ipmulticast_min, addrlo, 6); 637 bcopy(ether_ipmulticast_max, addrhi, 6); 638 } 639 else { 640 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 641 bcopy(addrlo, addrhi, 6); 642 } 643 break; 644 #endif 645 646 default: 647 splx(s); 648 return (EAFNOSUPPORT); 649 } 650 651 /* 652 * Look up the address in our list. 653 */ 654 ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm); 655 if (enm == NULL) { 656 splx(s); 657 return (ENXIO); 658 } 659 if (--enm->enm_refcount != 0) { 660 /* 661 * Still some claims to this record. 662 */ 663 splx(s); 664 return (0); 665 } 666 /* 667 * No remaining claims to this record; unlink and free it. 668 */ 669 LIST_REMOVE(enm, enm_list); 670 free(enm, M_IFMADDR); 671 ac->ac_multicnt--; 672 splx(s); 673 /* 674 * Return ENETRESET to inform the driver that the list has changed 675 * and its reception filter should be adjusted accordingly. 676 */ 677 return (ENETRESET); 678 } 679
Indexes created Mon Sep 22 21:09:42 GMT 2025