if_ethersubr.c revision 1.21.4.2
1 /* $NetBSD: if_ethersubr.c,v 1.21.4.2 1997/02/11 20:21:12 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 struct arphdr *ah; 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) != NULL) { 117 if ((rt->rt_flags & RTF_UP) == 0) { 118 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) 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 (m->m_flags & M_BCAST) 143 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 144 sizeof(edst)); 145 146 else if (m->m_flags & M_MCAST) { 147 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 148 (caddr_t)edst) 149 150 } else if (!arpresolve(ifp, rt, m, dst, edst)) 151 return (0); /* if not yet resolved */ 152 /* If broadcasting on a simplex interface, loopback a copy */ 153 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 154 mcopy = m_copy(m, 0, (int)M_COPYALL); 155 etype = htons(ETHERTYPE_IP); 156 break; 157 158 case AF_ARP: 159 ah = mtod(m, struct arphdr *); 160 if (m->m_flags & M_BCAST) 161 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 162 sizeof(edst)); 163 else 164 bcopy((caddr_t)ar_tha(ah), 165 (caddr_t)edst, sizeof(edst)); 166 167 switch(ah->ar_op) { 168 case ARPOP_REVREQUEST: 169 case ARPOP_REVREPLY: 170 etype = htons(ETHERTYPE_REVARP); 171 break; 172 173 case ARPOP_REQUEST: 174 case ARPOP_REPLY: 175 default: 176 etype = htons(ETHERTYPE_ARP); 177 } 178 179 break; 180 #endif 181 #ifdef NS 182 case AF_NS: 183 etype = htons(ETHERTYPE_NS); 184 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 185 (caddr_t)edst, sizeof (edst)); 186 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 187 return (looutput(ifp, m, dst, rt)); 188 /* If broadcasting on a simplex interface, loopback a copy */ 189 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 190 mcopy = m_copy(m, 0, (int)M_COPYALL); 191 break; 192 #endif 193 #ifdef ISO 194 case AF_ISO: { 195 int snpalen; 196 struct llc *l; 197 register struct sockaddr_dl *sdl; 198 199 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 200 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 201 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 202 } else { 203 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 204 (char *)edst, &snpalen); 205 if (error) 206 goto bad; /* Not Resolved */ 207 } 208 /* If broadcasting on a simplex interface, loopback a copy */ 209 if (*edst & 1) 210 m->m_flags |= (M_BCAST|M_MCAST); 211 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 212 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 213 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 214 if (mcopy) { 215 eh = mtod(mcopy, struct ether_header *); 216 bcopy((caddr_t)edst, 217 (caddr_t)eh->ether_dhost, sizeof (edst)); 218 bcopy(LLADDR(ifp->if_sadl), 219 (caddr_t)eh->ether_shost, sizeof (edst)); 220 } 221 } 222 M_PREPEND(m, 3, M_DONTWAIT); 223 if (m == NULL) 224 return (0); 225 etype = htons(m->m_pkthdr.len); 226 l = mtod(m, struct llc *); 227 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 228 l->llc_control = LLC_UI; 229 #ifdef ARGO_DEBUG 230 if (argo_debug[D_ETHER]) { 231 int i; 232 printf("unoutput: sending pkt to: "); 233 for (i=0; i<6; i++) 234 printf("%x ", edst[i] & 0xff); 235 printf("\n"); 236 } 237 #endif 238 } break; 239 #endif /* ISO */ 240 #ifdef LLC 241 /* case AF_NSAP: */ 242 case AF_CCITT: { 243 register struct sockaddr_dl *sdl = 244 (struct sockaddr_dl *) rt -> rt_gateway; 245 246 if (sdl && sdl->sdl_family == AF_LINK 247 && sdl->sdl_alen > 0) { 248 bcopy(LLADDR(sdl), (char *)edst, 249 sizeof(edst)); 250 } else goto bad; /* Not a link interface ? Funny ... */ 251 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 252 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 253 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 254 if (mcopy) { 255 eh = mtod(mcopy, struct ether_header *); 256 bcopy((caddr_t)edst, 257 (caddr_t)eh->ether_dhost, sizeof (edst)); 258 bcopy(LLADDR(ifp->if_sadl), 259 (caddr_t)eh->ether_shost, sizeof (edst)); 260 } 261 } 262 etype = htons(m->m_pkthdr.len); 263 #ifdef LLC_DEBUG 264 { 265 int i; 266 register struct llc *l = mtod(m, struct llc *); 267 268 printf("ether_output: sending LLC2 pkt to: "); 269 for (i=0; i<6; i++) 270 printf("%x ", edst[i] & 0xff); 271 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 272 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 273 l->llc_control & 0xff); 274 275 } 276 #endif /* LLC_DEBUG */ 277 } break; 278 #endif /* LLC */ 279 280 case AF_UNSPEC: 281 eh = (struct ether_header *)dst->sa_data; 282 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 283 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 284 etype = eh->ether_type; 285 break; 286 287 default: 288 printf("%s: can't handle af%d\n", ifp->if_xname, 289 dst->sa_family); 290 senderr(EAFNOSUPPORT); 291 } 292 293 if (mcopy) 294 (void) looutput(ifp, mcopy, dst, rt); 295 296 /* 297 * Add local net header. If no space in first mbuf, 298 * allocate another. 299 */ 300 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 301 if (m == 0) 302 senderr(ENOBUFS); 303 eh = mtod(m, struct ether_header *); 304 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 305 sizeof(eh->ether_type)); 306 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 307 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 308 sizeof(eh->ether_shost)); 309 s = splimp(); 310 /* 311 * Queue message on interface, and start output if interface 312 * not yet active. 313 */ 314 if (IF_QFULL(&ifp->if_snd)) { 315 IF_DROP(&ifp->if_snd); 316 splx(s); 317 senderr(ENOBUFS); 318 } 319 ifp->if_obytes += m->m_pkthdr.len; 320 IF_ENQUEUE(&ifp->if_snd, m); 321 if ((ifp->if_flags & IFF_OACTIVE) == 0) 322 (*ifp->if_start)(ifp); 323 splx(s); 324 if (m->m_flags & M_MCAST) 325 ifp->if_omcasts++; 326 return (error); 327 328 bad: 329 if (m) 330 m_freem(m); 331 return (error); 332 } 333 334 /* 335 * Process a received Ethernet packet; 336 * the packet is in the mbuf chain m without 337 * the ether header, which is provided separately. 338 */ 339 void 340 ether_input(ifp, eh, m) 341 struct ifnet *ifp; 342 register struct ether_header *eh; 343 struct mbuf *m; 344 { 345 register struct ifqueue *inq; 346 u_int16_t etype; 347 int s; 348 #if defined (ISO) || defined (LLC) 349 register struct llc *l; 350 struct ethercom *ac = (struct ethercom *)ifp; 351 #endif 352 353 if ((ifp->if_flags & IFF_UP) == 0) { 354 m_freem(m); 355 return; 356 } 357 ifp->if_lastchange = time; 358 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 359 if (eh->ether_dhost[0] & 1) { 360 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 361 sizeof(etherbroadcastaddr)) == 0) 362 m->m_flags |= M_BCAST; 363 else 364 m->m_flags |= M_MCAST; 365 } 366 if (m->m_flags & (M_BCAST|M_MCAST)) 367 ifp->if_imcasts++; 368 369 etype = ntohs(eh->ether_type); 370 switch (etype) { 371 #ifdef INET 372 case ETHERTYPE_IP: 373 schednetisr(NETISR_IP); 374 inq = &ipintrq; 375 break; 376 377 case ETHERTYPE_ARP: 378 schednetisr(NETISR_ARP); 379 inq = &arpintrq; 380 break; 381 382 case ETHERTYPE_REVARP: 383 revarpinput(m); /* XXX queue? */ 384 return; 385 #endif 386 #ifdef NS 387 case ETHERTYPE_NS: 388 schednetisr(NETISR_NS); 389 inq = &nsintrq; 390 break; 391 392 #endif 393 default: 394 #if defined (ISO) || defined (LLC) 395 if (etype > ETHERMTU) 396 goto dropanyway; 397 l = mtod(m, struct llc *); 398 switch (l->llc_dsap) { 399 #ifdef ISO 400 case LLC_ISO_LSAP: 401 switch (l->llc_control) { 402 case LLC_UI: 403 /* LLC_UI_P forbidden in class 1 service */ 404 if ((l->llc_dsap == LLC_ISO_LSAP) && 405 (l->llc_ssap == LLC_ISO_LSAP)) { 406 /* LSAP for ISO */ 407 if (m->m_pkthdr.len > etype) 408 m_adj(m, etype - m->m_pkthdr.len); 409 m->m_data += 3; /* XXX */ 410 m->m_len -= 3; /* XXX */ 411 m->m_pkthdr.len -= 3; /* XXX */ 412 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 413 if (m == 0) 414 return; 415 *mtod(m, struct ether_header *) = *eh; 416 #ifdef ARGO_DEBUG 417 if (argo_debug[D_ETHER]) 418 printf("clnp packet"); 419 #endif 420 schednetisr(NETISR_ISO); 421 inq = &clnlintrq; 422 break; 423 } 424 goto dropanyway; 425 426 case LLC_XID: 427 case LLC_XID_P: 428 if(m->m_len < 6) 429 goto dropanyway; 430 l->llc_window = 0; 431 l->llc_fid = 9; 432 l->llc_class = 1; 433 l->llc_dsap = l->llc_ssap = 0; 434 /* Fall through to */ 435 case LLC_TEST: 436 case LLC_TEST_P: 437 { 438 struct sockaddr sa; 439 register struct ether_header *eh2; 440 int i; 441 u_char c = l->llc_dsap; 442 443 l->llc_dsap = l->llc_ssap; 444 l->llc_ssap = c; 445 if (m->m_flags & (M_BCAST | M_MCAST)) 446 bcopy(LLADDR(ifp->if_sadl), 447 (caddr_t)eh->ether_dhost, 6); 448 sa.sa_family = AF_UNSPEC; 449 sa.sa_len = sizeof(sa); 450 eh2 = (struct ether_header *)sa.sa_data; 451 for (i = 0; i < 6; i++) { 452 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 453 eh2->ether_dhost[i] = 454 eh->ether_dhost[i] = eh->ether_shost[i]; 455 eh->ether_shost[i] = c; 456 } 457 ifp->if_output(ifp, m, &sa, NULL); 458 return; 459 } 460 default: 461 m_freem(m); 462 return; 463 } 464 break; 465 #endif /* ISO */ 466 #ifdef LLC 467 case LLC_X25_LSAP: 468 { 469 if (m->m_pkthdr.len > etype) 470 m_adj(m, etype - m->m_pkthdr.len); 471 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 472 if (m == 0) 473 return; 474 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 475 eh->ether_dhost, LLC_X25_LSAP, 6, 476 mtod(m, struct sdl_hdr *))) 477 panic("ETHER cons addr failure"); 478 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 479 #ifdef LLC_DEBUG 480 printf("llc packet\n"); 481 #endif /* LLC_DEBUG */ 482 schednetisr(NETISR_CCITT); 483 inq = &llcintrq; 484 break; 485 } 486 #endif /* LLC */ 487 dropanyway: 488 default: 489 m_freem(m); 490 return; 491 } 492 #else /* ISO || LLC */ 493 m_freem(m); 494 return; 495 #endif /* ISO || LLC */ 496 } 497 498 s = splimp(); 499 if (IF_QFULL(inq)) { 500 IF_DROP(inq); 501 m_freem(m); 502 } else 503 IF_ENQUEUE(inq, m); 504 splx(s); 505 } 506 507 /* 508 * Convert Ethernet address to printable (loggable) representation. 509 */ 510 static char digits[] = "0123456789abcdef"; 511 char * 512 ether_sprintf(ap) 513 register u_char *ap; 514 { 515 register i; 516 static char etherbuf[18]; 517 register char *cp = etherbuf; 518 519 for (i = 0; i < 6; i++) { 520 *cp++ = digits[*ap >> 4]; 521 *cp++ = digits[*ap++ & 0xf]; 522 *cp++ = ':'; 523 } 524 *--cp = 0; 525 return (etherbuf); 526 } 527 528 /* 529 * Perform common duties while attaching to interface list 530 */ 531 void 532 ether_ifattach(ifp, lla) 533 register struct ifnet *ifp; 534 u_int8_t * lla; 535 { 536 register struct sockaddr_dl *sdl; 537 538 ifp->if_type = IFT_ETHER; 539 ifp->if_addrlen = 6; 540 ifp->if_hdrlen = 14; 541 ifp->if_mtu = ETHERMTU; 542 ifp->if_output = ether_output; 543 if ((sdl = ifp->if_sadl) && 544 sdl->sdl_family == AF_LINK) { 545 sdl->sdl_type = IFT_ETHER; 546 sdl->sdl_alen = ifp->if_addrlen; 547 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 548 } 549 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 550 } 551 552 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 553 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 554 /* 555 * Add an Ethernet multicast address or range of addresses to the list for a 556 * given interface. 557 */ 558 int 559 ether_addmulti(ifr, ec) 560 struct ifreq *ifr; 561 register struct ethercom *ec; 562 { 563 register struct ether_multi *enm; 564 struct sockaddr_in *sin; 565 u_char addrlo[6]; 566 u_char addrhi[6]; 567 int s = splimp(); 568 569 switch (ifr->ifr_addr.sa_family) { 570 571 case AF_UNSPEC: 572 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 573 bcopy(addrlo, addrhi, 6); 574 break; 575 576 #ifdef INET 577 case AF_INET: 578 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 579 if (sin->sin_addr.s_addr == INADDR_ANY) { 580 /* 581 * An IP address of INADDR_ANY means listen to all 582 * of the Ethernet multicast addresses used for IP. 583 * (This is for the sake of IP multicast routers.) 584 */ 585 bcopy(ether_ipmulticast_min, addrlo, 6); 586 bcopy(ether_ipmulticast_max, addrhi, 6); 587 } 588 else { 589 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 590 bcopy(addrlo, addrhi, 6); 591 } 592 break; 593 #endif 594 595 default: 596 splx(s); 597 return (EAFNOSUPPORT); 598 } 599 600 /* 601 * Verify that we have valid Ethernet multicast addresses. 602 */ 603 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 604 splx(s); 605 return (EINVAL); 606 } 607 /* 608 * See if the address range is already in the list. 609 */ 610 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 611 if (enm != NULL) { 612 /* 613 * Found it; just increment the reference count. 614 */ 615 ++enm->enm_refcount; 616 splx(s); 617 return (0); 618 } 619 /* 620 * New address or range; malloc a new multicast record 621 * and link it into the interface's multicast list. 622 */ 623 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 624 if (enm == NULL) { 625 splx(s); 626 return (ENOBUFS); 627 } 628 bcopy(addrlo, enm->enm_addrlo, 6); 629 bcopy(addrhi, enm->enm_addrhi, 6); 630 enm->enm_ec = ec; 631 enm->enm_refcount = 1; 632 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 633 ec->ec_multicnt++; 634 splx(s); 635 /* 636 * Return ENETRESET to inform the driver that the list has changed 637 * and its reception filter should be adjusted accordingly. 638 */ 639 return (ENETRESET); 640 } 641 642 /* 643 * Delete a multicast address record. 644 */ 645 int 646 ether_delmulti(ifr, ec) 647 struct ifreq *ifr; 648 register struct ethercom *ec; 649 { 650 register struct ether_multi *enm; 651 struct sockaddr_in *sin; 652 u_char addrlo[6]; 653 u_char addrhi[6]; 654 int s = splimp(); 655 656 switch (ifr->ifr_addr.sa_family) { 657 658 case AF_UNSPEC: 659 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 660 bcopy(addrlo, addrhi, 6); 661 break; 662 663 #ifdef INET 664 case AF_INET: 665 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 666 if (sin->sin_addr.s_addr == INADDR_ANY) { 667 /* 668 * An IP address of INADDR_ANY means stop listening 669 * to the range of Ethernet multicast addresses used 670 * for IP. 671 */ 672 bcopy(ether_ipmulticast_min, addrlo, 6); 673 bcopy(ether_ipmulticast_max, addrhi, 6); 674 } 675 else { 676 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 677 bcopy(addrlo, addrhi, 6); 678 } 679 break; 680 #endif 681 682 default: 683 splx(s); 684 return (EAFNOSUPPORT); 685 } 686 687 /* 688 * Look up the address in our list. 689 */ 690 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 691 if (enm == NULL) { 692 splx(s); 693 return (ENXIO); 694 } 695 if (--enm->enm_refcount != 0) { 696 /* 697 * Still some claims to this record. 698 */ 699 splx(s); 700 return (0); 701 } 702 /* 703 * No remaining claims to this record; unlink and free it. 704 */ 705 LIST_REMOVE(enm, enm_list); 706 free(enm, M_IFMADDR); 707 ec->ec_multicnt--; 708 splx(s); 709 /* 710 * Return ENETRESET to inform the driver that the list has changed 711 * and its reception filter should be adjusted accordingly. 712 */ 713 return (ENETRESET); 714 } 715
Indexes created Tue Sep 30 10:09:55 GMT 2025