if_ethersubr.c revision 1.21.4.1
1 /* $NetBSD: if_ethersubr.c,v 1.21.4.1 1997/02/07 18:06:58 is 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 <net/if_ether.h> 59 60 #include <netinet/in.h> 61 #ifdef INET 62 #include <netinet/in_var.h> 63 #endif 64 #include <netinet/if_ether.h> 65 66 #ifdef NS 67 #include <netns/ns.h> 68 #include <netns/ns_if.h> 69 #endif 70 71 #ifdef ISO 72 #include <netiso/argo_debug.h> 73 #include <netiso/iso.h> 74 #include <netiso/iso_var.h> 75 #include <netiso/iso_snpac.h> 76 #endif 77 78 #ifdef LLC 79 #include <netccitt/dll.h> 80 #include <netccitt/llc_var.h> 81 #endif 82 83 #if defined(LLC) && defined(CCITT) 84 extern struct ifqueue pkintrq; 85 #endif 86 87 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 88 #define senderr(e) { error = (e); goto bad;} 89 90 #define SIN(x) ((struct sockaddr_in *)x) 91 92 /* 93 * Ethernet output routine. 94 * Encapsulate a packet of type family for the local net. 95 * Assumes that ifp is actually pointer to ethercom structure. 96 */ 97 int 98 ether_output(ifp, m0, dst, rt0) 99 register struct ifnet *ifp; 100 struct mbuf *m0; 101 struct sockaddr *dst; 102 struct rtentry *rt0; 103 { 104 u_int16_t etype; 105 int s, error = 0; 106 u_char edst[6]; 107 register struct mbuf *m = m0; 108 register struct rtentry *rt; 109 struct mbuf *mcopy = (struct mbuf *)0; 110 register struct ether_header *eh; 111 112 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 113 senderr(ENETDOWN); 114 ifp->if_lastchange = time; 115 if ((rt = rt0) != NULL) { 116 if ((rt->rt_flags & RTF_UP) == 0) { 117 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) 118 rt->rt_refcnt--; 119 else 120 senderr(EHOSTUNREACH); 121 } 122 if (rt->rt_flags & RTF_GATEWAY) { 123 if (rt->rt_gwroute == 0) 124 goto lookup; 125 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 126 rtfree(rt); rt = rt0; 127 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 128 if ((rt = rt->rt_gwroute) == 0) 129 senderr(EHOSTUNREACH); 130 } 131 } 132 if (rt->rt_flags & RTF_REJECT) 133 if (rt->rt_rmx.rmx_expire == 0 || 134 time.tv_sec < rt->rt_rmx.rmx_expire) 135 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 136 } 137 switch (dst->sa_family) { 138 139 #ifdef INET 140 case AF_INET: 141 if (m->m_flags & M_BCAST) 142 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 143 sizeof(edst)); 144 145 else if (m->m_flags & M_MCAST) { 146 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 147 (caddr_t)edst) 148 149 } else if (!arpresolve(ifp, rt, m, dst, edst)) 150 return (0); /* if not yet resolved */ 151 /* If broadcasting on a simplex interface, loopback a copy */ 152 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 153 mcopy = m_copy(m, 0, (int)M_COPYALL); 154 etype = htons(ETHERTYPE_IP); 155 break; 156 #endif 157 #ifdef NS 158 case AF_NS: 159 etype = htons(ETHERTYPE_NS); 160 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 161 (caddr_t)edst, sizeof (edst)); 162 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 163 return (looutput(ifp, m, dst, rt)); 164 /* If broadcasting on a simplex interface, loopback a copy */ 165 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 166 mcopy = m_copy(m, 0, (int)M_COPYALL); 167 break; 168 #endif 169 #ifdef ISO 170 case AF_ISO: { 171 int snpalen; 172 struct llc *l; 173 register struct sockaddr_dl *sdl; 174 175 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 176 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 177 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 178 } else { 179 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 180 (char *)edst, &snpalen); 181 if (error) 182 goto bad; /* Not Resolved */ 183 } 184 /* If broadcasting on a simplex interface, loopback a copy */ 185 if (*edst & 1) 186 m->m_flags |= (M_BCAST|M_MCAST); 187 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 188 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 189 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 190 if (mcopy) { 191 eh = mtod(mcopy, struct ether_header *); 192 bcopy((caddr_t)edst, 193 (caddr_t)eh->ether_dhost, sizeof (edst)); 194 bcopy(LLADDR(ifp->if_sadl), 195 (caddr_t)eh->ether_shost, sizeof (edst)); 196 } 197 } 198 M_PREPEND(m, 3, M_DONTWAIT); 199 if (m == NULL) 200 return (0); 201 etype = htons(m->m_pkthdr.len); 202 l = mtod(m, struct llc *); 203 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 204 l->llc_control = LLC_UI; 205 #ifdef ARGO_DEBUG 206 if (argo_debug[D_ETHER]) { 207 int i; 208 printf("unoutput: sending pkt to: "); 209 for (i=0; i<6; i++) 210 printf("%x ", edst[i] & 0xff); 211 printf("\n"); 212 } 213 #endif 214 } break; 215 #endif /* ISO */ 216 #ifdef LLC 217 /* case AF_NSAP: */ 218 case AF_CCITT: { 219 register struct sockaddr_dl *sdl = 220 (struct sockaddr_dl *) rt -> rt_gateway; 221 222 if (sdl && sdl->sdl_family == AF_LINK 223 && sdl->sdl_alen > 0) { 224 bcopy(LLADDR(sdl), (char *)edst, 225 sizeof(edst)); 226 } else goto bad; /* Not a link interface ? Funny ... */ 227 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 228 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 229 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 230 if (mcopy) { 231 eh = mtod(mcopy, struct ether_header *); 232 bcopy((caddr_t)edst, 233 (caddr_t)eh->ether_dhost, sizeof (edst)); 234 bcopy(LLADDR(ifp->if_sadl), 235 (caddr_t)eh->ether_shost, sizeof (edst)); 236 } 237 } 238 etype = htons(m->m_pkthdr.len); 239 #ifdef LLC_DEBUG 240 { 241 int i; 242 register struct llc *l = mtod(m, struct llc *); 243 244 printf("ether_output: sending LLC2 pkt to: "); 245 for (i=0; i<6; i++) 246 printf("%x ", edst[i] & 0xff); 247 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 248 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 249 l->llc_control & 0xff); 250 251 } 252 #endif /* LLC_DEBUG */ 253 } break; 254 #endif /* LLC */ 255 256 case AF_UNSPEC: 257 eh = (struct ether_header *)dst->sa_data; 258 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 259 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 260 etype = eh->ether_type; 261 break; 262 263 default: 264 printf("%s: can't handle af%d\n", ifp->if_xname, 265 dst->sa_family); 266 senderr(EAFNOSUPPORT); 267 } 268 269 if (mcopy) 270 (void) looutput(ifp, mcopy, dst, rt); 271 272 /* 273 * Add local net header. If no space in first mbuf, 274 * allocate another. 275 */ 276 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 277 if (m == 0) 278 senderr(ENOBUFS); 279 eh = mtod(m, struct ether_header *); 280 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 281 sizeof(eh->ether_type)); 282 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 283 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 284 sizeof(eh->ether_shost)); 285 s = splimp(); 286 /* 287 * Queue message on interface, and start output if interface 288 * not yet active. 289 */ 290 if (IF_QFULL(&ifp->if_snd)) { 291 IF_DROP(&ifp->if_snd); 292 splx(s); 293 senderr(ENOBUFS); 294 } 295 ifp->if_obytes += m->m_pkthdr.len; 296 IF_ENQUEUE(&ifp->if_snd, m); 297 if ((ifp->if_flags & IFF_OACTIVE) == 0) 298 (*ifp->if_start)(ifp); 299 splx(s); 300 if (m->m_flags & M_MCAST) 301 ifp->if_omcasts++; 302 return (error); 303 304 bad: 305 if (m) 306 m_freem(m); 307 return (error); 308 } 309 310 /* 311 * Process a received Ethernet packet; 312 * the packet is in the mbuf chain m without 313 * the ether header, which is provided separately. 314 */ 315 void 316 ether_input(ifp, eh, m) 317 struct ifnet *ifp; 318 register struct ether_header *eh; 319 struct mbuf *m; 320 { 321 register struct ifqueue *inq; 322 u_int16_t etype; 323 int s; 324 #if defined (ISO) || defined (LLC) 325 register struct llc *l; 326 struct ethercom *ac = (struct ethercom *)ifp; 327 #endif 328 329 if ((ifp->if_flags & IFF_UP) == 0) { 330 m_freem(m); 331 return; 332 } 333 ifp->if_lastchange = time; 334 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 335 if (eh->ether_dhost[0] & 1) { 336 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 337 sizeof(etherbroadcastaddr)) == 0) 338 m->m_flags |= M_BCAST; 339 else 340 m->m_flags |= M_MCAST; 341 } 342 if (m->m_flags & (M_BCAST|M_MCAST)) 343 ifp->if_imcasts++; 344 345 etype = ntohs(eh->ether_type); 346 switch (etype) { 347 #ifdef INET 348 case ETHERTYPE_IP: 349 schednetisr(NETISR_IP); 350 inq = &ipintrq; 351 break; 352 353 case ETHERTYPE_ARP: 354 schednetisr(NETISR_ARP); 355 inq = &arpintrq; 356 break; 357 358 case ETHERTYPE_REVARP: 359 revarpinput(m); /* XXX queue? */ 360 return; 361 #endif 362 #ifdef NS 363 case ETHERTYPE_NS: 364 schednetisr(NETISR_NS); 365 inq = &nsintrq; 366 break; 367 368 #endif 369 default: 370 #if defined (ISO) || defined (LLC) 371 if (etype > ETHERMTU) 372 goto dropanyway; 373 l = mtod(m, struct llc *); 374 switch (l->llc_dsap) { 375 #ifdef ISO 376 case LLC_ISO_LSAP: 377 switch (l->llc_control) { 378 case LLC_UI: 379 /* LLC_UI_P forbidden in class 1 service */ 380 if ((l->llc_dsap == LLC_ISO_LSAP) && 381 (l->llc_ssap == LLC_ISO_LSAP)) { 382 /* LSAP for ISO */ 383 if (m->m_pkthdr.len > etype) 384 m_adj(m, etype - m->m_pkthdr.len); 385 m->m_data += 3; /* XXX */ 386 m->m_len -= 3; /* XXX */ 387 m->m_pkthdr.len -= 3; /* XXX */ 388 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 389 if (m == 0) 390 return; 391 *mtod(m, struct ether_header *) = *eh; 392 #ifdef ARGO_DEBUG 393 if (argo_debug[D_ETHER]) 394 printf("clnp packet"); 395 #endif 396 schednetisr(NETISR_ISO); 397 inq = &clnlintrq; 398 break; 399 } 400 goto dropanyway; 401 402 case LLC_XID: 403 case LLC_XID_P: 404 if(m->m_len < 6) 405 goto dropanyway; 406 l->llc_window = 0; 407 l->llc_fid = 9; 408 l->llc_class = 1; 409 l->llc_dsap = l->llc_ssap = 0; 410 /* Fall through to */ 411 case LLC_TEST: 412 case LLC_TEST_P: 413 { 414 struct sockaddr sa; 415 register struct ether_header *eh2; 416 int i; 417 u_char c = l->llc_dsap; 418 419 l->llc_dsap = l->llc_ssap; 420 l->llc_ssap = c; 421 if (m->m_flags & (M_BCAST | M_MCAST)) 422 bcopy(LLADDR(ifp->if_sadl), 423 (caddr_t)eh->ether_dhost, 6); 424 sa.sa_family = AF_UNSPEC; 425 sa.sa_len = sizeof(sa); 426 eh2 = (struct ether_header *)sa.sa_data; 427 for (i = 0; i < 6; i++) { 428 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 429 eh2->ether_dhost[i] = 430 eh->ether_dhost[i] = eh->ether_shost[i]; 431 eh->ether_shost[i] = c; 432 } 433 ifp->if_output(ifp, m, &sa, NULL); 434 return; 435 } 436 default: 437 m_freem(m); 438 return; 439 } 440 break; 441 #endif /* ISO */ 442 #ifdef LLC 443 case LLC_X25_LSAP: 444 { 445 if (m->m_pkthdr.len > etype) 446 m_adj(m, etype - m->m_pkthdr.len); 447 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 448 if (m == 0) 449 return; 450 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 451 eh->ether_dhost, LLC_X25_LSAP, 6, 452 mtod(m, struct sdl_hdr *))) 453 panic("ETHER cons addr failure"); 454 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 455 #ifdef LLC_DEBUG 456 printf("llc packet\n"); 457 #endif /* LLC_DEBUG */ 458 schednetisr(NETISR_CCITT); 459 inq = &llcintrq; 460 break; 461 } 462 #endif /* LLC */ 463 dropanyway: 464 default: 465 m_freem(m); 466 return; 467 } 468 #else /* ISO || LLC */ 469 m_freem(m); 470 return; 471 #endif /* ISO || LLC */ 472 } 473 474 s = splimp(); 475 if (IF_QFULL(inq)) { 476 IF_DROP(inq); 477 m_freem(m); 478 } else 479 IF_ENQUEUE(inq, m); 480 splx(s); 481 } 482 483 /* 484 * Convert Ethernet address to printable (loggable) representation. 485 */ 486 static char digits[] = "0123456789abcdef"; 487 char * 488 ether_sprintf(ap) 489 register u_char *ap; 490 { 491 register i; 492 static char etherbuf[18]; 493 register char *cp = etherbuf; 494 495 for (i = 0; i < 6; i++) { 496 *cp++ = digits[*ap >> 4]; 497 *cp++ = digits[*ap++ & 0xf]; 498 *cp++ = ':'; 499 } 500 *--cp = 0; 501 return (etherbuf); 502 } 503 504 /* 505 * Perform common duties while attaching to interface list 506 */ 507 void 508 ether_ifattach(ifp, lla) 509 register struct ifnet *ifp; 510 u_int8_t * lla; 511 { 512 register struct sockaddr_dl *sdl; 513 514 ifp->if_type = IFT_ETHER; 515 ifp->if_addrlen = 6; 516 ifp->if_hdrlen = 14; 517 ifp->if_mtu = ETHERMTU; 518 ifp->if_output = ether_output; 519 if ((sdl = ifp->if_sadl) && 520 sdl->sdl_family == AF_LINK) { 521 sdl->sdl_type = IFT_ETHER; 522 sdl->sdl_alen = ifp->if_addrlen; 523 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 524 } 525 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 526 } 527 528 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 529 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 530 /* 531 * Add an Ethernet multicast address or range of addresses to the list for a 532 * given interface. 533 */ 534 int 535 ether_addmulti(ifr, ec) 536 struct ifreq *ifr; 537 register struct ethercom *ec; 538 { 539 register struct ether_multi *enm; 540 struct sockaddr_in *sin; 541 u_char addrlo[6]; 542 u_char addrhi[6]; 543 int s = splimp(); 544 545 switch (ifr->ifr_addr.sa_family) { 546 547 case AF_UNSPEC: 548 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 549 bcopy(addrlo, addrhi, 6); 550 break; 551 552 #ifdef INET 553 case AF_INET: 554 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 555 if (sin->sin_addr.s_addr == INADDR_ANY) { 556 /* 557 * An IP address of INADDR_ANY means listen to all 558 * of the Ethernet multicast addresses used for IP. 559 * (This is for the sake of IP multicast routers.) 560 */ 561 bcopy(ether_ipmulticast_min, addrlo, 6); 562 bcopy(ether_ipmulticast_max, addrhi, 6); 563 } 564 else { 565 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 566 bcopy(addrlo, addrhi, 6); 567 } 568 break; 569 #endif 570 571 default: 572 splx(s); 573 return (EAFNOSUPPORT); 574 } 575 576 /* 577 * Verify that we have valid Ethernet multicast addresses. 578 */ 579 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 580 splx(s); 581 return (EINVAL); 582 } 583 /* 584 * See if the address range is already in the list. 585 */ 586 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 587 if (enm != NULL) { 588 /* 589 * Found it; just increment the reference count. 590 */ 591 ++enm->enm_refcount; 592 splx(s); 593 return (0); 594 } 595 /* 596 * New address or range; malloc a new multicast record 597 * and link it into the interface's multicast list. 598 */ 599 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 600 if (enm == NULL) { 601 splx(s); 602 return (ENOBUFS); 603 } 604 bcopy(addrlo, enm->enm_addrlo, 6); 605 bcopy(addrhi, enm->enm_addrhi, 6); 606 enm->enm_ec = ec; 607 enm->enm_refcount = 1; 608 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 609 ec->ec_multicnt++; 610 splx(s); 611 /* 612 * Return ENETRESET to inform the driver that the list has changed 613 * and its reception filter should be adjusted accordingly. 614 */ 615 return (ENETRESET); 616 } 617 618 /* 619 * Delete a multicast address record. 620 */ 621 int 622 ether_delmulti(ifr, ec) 623 struct ifreq *ifr; 624 register struct ethercom *ec; 625 { 626 register struct ether_multi *enm; 627 struct sockaddr_in *sin; 628 u_char addrlo[6]; 629 u_char addrhi[6]; 630 int s = splimp(); 631 632 switch (ifr->ifr_addr.sa_family) { 633 634 case AF_UNSPEC: 635 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 636 bcopy(addrlo, addrhi, 6); 637 break; 638 639 #ifdef INET 640 case AF_INET: 641 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 642 if (sin->sin_addr.s_addr == INADDR_ANY) { 643 /* 644 * An IP address of INADDR_ANY means stop listening 645 * to the range of Ethernet multicast addresses used 646 * for IP. 647 */ 648 bcopy(ether_ipmulticast_min, addrlo, 6); 649 bcopy(ether_ipmulticast_max, addrhi, 6); 650 } 651 else { 652 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 653 bcopy(addrlo, addrhi, 6); 654 } 655 break; 656 #endif 657 658 default: 659 splx(s); 660 return (EAFNOSUPPORT); 661 } 662 663 /* 664 * Look up the address in our list. 665 */ 666 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 667 if (enm == NULL) { 668 splx(s); 669 return (ENXIO); 670 } 671 if (--enm->enm_refcount != 0) { 672 /* 673 * Still some claims to this record. 674 */ 675 splx(s); 676 return (0); 677 } 678 /* 679 * No remaining claims to this record; unlink and free it. 680 */ 681 LIST_REMOVE(enm, enm_list); 682 free(enm, M_IFMADDR); 683 ec->ec_multicnt--; 684 splx(s); 685 /* 686 * Return ENETRESET to inform the driver that the list has changed 687 * and its reception filter should be adjusted accordingly. 688 */ 689 return (ENETRESET); 690 } 691
Indexes created Tue Sep 30 10:09:55 GMT 2025