if_ethersubr.c revision 1.21.4.3
1 /* $NetBSD: if_ethersubr.c,v 1.21.4.3 1997/02/12 16:52:14 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 ah->ar_hrd = htons(ARPHRD_ETHER); 168 169 switch(ntohs(ah->ar_op)) { 170 case ARPOP_REVREQUEST: 171 case ARPOP_REVREPLY: 172 etype = htons(ETHERTYPE_REVARP); 173 break; 174 175 case ARPOP_REQUEST: 176 case ARPOP_REPLY: 177 default: 178 etype = htons(ETHERTYPE_ARP); 179 } 180 181 break; 182 #endif 183 #ifdef NS 184 case AF_NS: 185 etype = htons(ETHERTYPE_NS); 186 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 187 (caddr_t)edst, sizeof (edst)); 188 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 189 return (looutput(ifp, m, dst, rt)); 190 /* If broadcasting on a simplex interface, loopback a copy */ 191 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 192 mcopy = m_copy(m, 0, (int)M_COPYALL); 193 break; 194 #endif 195 #ifdef ISO 196 case AF_ISO: { 197 int snpalen; 198 struct llc *l; 199 register struct sockaddr_dl *sdl; 200 201 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 202 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 203 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 204 } else { 205 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 206 (char *)edst, &snpalen); 207 if (error) 208 goto bad; /* Not Resolved */ 209 } 210 /* If broadcasting on a simplex interface, loopback a copy */ 211 if (*edst & 1) 212 m->m_flags |= (M_BCAST|M_MCAST); 213 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 214 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 215 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 216 if (mcopy) { 217 eh = mtod(mcopy, struct ether_header *); 218 bcopy((caddr_t)edst, 219 (caddr_t)eh->ether_dhost, sizeof (edst)); 220 bcopy(LLADDR(ifp->if_sadl), 221 (caddr_t)eh->ether_shost, sizeof (edst)); 222 } 223 } 224 M_PREPEND(m, 3, M_DONTWAIT); 225 if (m == NULL) 226 return (0); 227 etype = htons(m->m_pkthdr.len); 228 l = mtod(m, struct llc *); 229 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 230 l->llc_control = LLC_UI; 231 #ifdef ARGO_DEBUG 232 if (argo_debug[D_ETHER]) { 233 int i; 234 printf("unoutput: sending pkt to: "); 235 for (i=0; i<6; i++) 236 printf("%x ", edst[i] & 0xff); 237 printf("\n"); 238 } 239 #endif 240 } break; 241 #endif /* ISO */ 242 #ifdef LLC 243 /* case AF_NSAP: */ 244 case AF_CCITT: { 245 register struct sockaddr_dl *sdl = 246 (struct sockaddr_dl *) rt -> rt_gateway; 247 248 if (sdl && sdl->sdl_family == AF_LINK 249 && sdl->sdl_alen > 0) { 250 bcopy(LLADDR(sdl), (char *)edst, 251 sizeof(edst)); 252 } else goto bad; /* Not a link interface ? Funny ... */ 253 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 254 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 255 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 256 if (mcopy) { 257 eh = mtod(mcopy, struct ether_header *); 258 bcopy((caddr_t)edst, 259 (caddr_t)eh->ether_dhost, sizeof (edst)); 260 bcopy(LLADDR(ifp->if_sadl), 261 (caddr_t)eh->ether_shost, sizeof (edst)); 262 } 263 } 264 etype = htons(m->m_pkthdr.len); 265 #ifdef LLC_DEBUG 266 { 267 int i; 268 register struct llc *l = mtod(m, struct llc *); 269 270 printf("ether_output: sending LLC2 pkt to: "); 271 for (i=0; i<6; i++) 272 printf("%x ", edst[i] & 0xff); 273 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 274 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 275 l->llc_control & 0xff); 276 277 } 278 #endif /* LLC_DEBUG */ 279 } break; 280 #endif /* LLC */ 281 282 case AF_UNSPEC: 283 eh = (struct ether_header *)dst->sa_data; 284 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 285 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 286 etype = eh->ether_type; 287 break; 288 289 default: 290 printf("%s: can't handle af%d\n", ifp->if_xname, 291 dst->sa_family); 292 senderr(EAFNOSUPPORT); 293 } 294 295 if (mcopy) 296 (void) looutput(ifp, mcopy, dst, rt); 297 298 /* 299 * Add local net header. If no space in first mbuf, 300 * allocate another. 301 */ 302 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 303 if (m == 0) 304 senderr(ENOBUFS); 305 eh = mtod(m, struct ether_header *); 306 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 307 sizeof(eh->ether_type)); 308 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 309 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 310 sizeof(eh->ether_shost)); 311 s = splimp(); 312 /* 313 * Queue message on interface, and start output if interface 314 * not yet active. 315 */ 316 if (IF_QFULL(&ifp->if_snd)) { 317 IF_DROP(&ifp->if_snd); 318 splx(s); 319 senderr(ENOBUFS); 320 } 321 ifp->if_obytes += m->m_pkthdr.len; 322 IF_ENQUEUE(&ifp->if_snd, m); 323 if ((ifp->if_flags & IFF_OACTIVE) == 0) 324 (*ifp->if_start)(ifp); 325 splx(s); 326 if (m->m_flags & M_MCAST) 327 ifp->if_omcasts++; 328 return (error); 329 330 bad: 331 if (m) 332 m_freem(m); 333 return (error); 334 } 335 336 /* 337 * Process a received Ethernet packet; 338 * the packet is in the mbuf chain m without 339 * the ether header, which is provided separately. 340 */ 341 void 342 ether_input(ifp, eh, m) 343 struct ifnet *ifp; 344 register struct ether_header *eh; 345 struct mbuf *m; 346 { 347 register struct ifqueue *inq; 348 u_int16_t etype; 349 int s; 350 #if defined (ISO) || defined (LLC) 351 register struct llc *l; 352 struct ethercom *ac = (struct ethercom *)ifp; 353 #endif 354 355 if ((ifp->if_flags & IFF_UP) == 0) { 356 m_freem(m); 357 return; 358 } 359 ifp->if_lastchange = time; 360 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 361 if (eh->ether_dhost[0] & 1) { 362 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 363 sizeof(etherbroadcastaddr)) == 0) 364 m->m_flags |= M_BCAST; 365 else 366 m->m_flags |= M_MCAST; 367 } 368 if (m->m_flags & (M_BCAST|M_MCAST)) 369 ifp->if_imcasts++; 370 371 etype = ntohs(eh->ether_type); 372 switch (etype) { 373 #ifdef INET 374 case ETHERTYPE_IP: 375 schednetisr(NETISR_IP); 376 inq = &ipintrq; 377 break; 378 379 case ETHERTYPE_ARP: 380 schednetisr(NETISR_ARP); 381 inq = &arpintrq; 382 break; 383 384 case ETHERTYPE_REVARP: 385 revarpinput(m); /* XXX queue? */ 386 return; 387 #endif 388 #ifdef NS 389 case ETHERTYPE_NS: 390 schednetisr(NETISR_NS); 391 inq = &nsintrq; 392 break; 393 394 #endif 395 default: 396 #if defined (ISO) || defined (LLC) 397 if (etype > ETHERMTU) 398 goto dropanyway; 399 l = mtod(m, struct llc *); 400 switch (l->llc_dsap) { 401 #ifdef ISO 402 case LLC_ISO_LSAP: 403 switch (l->llc_control) { 404 case LLC_UI: 405 /* LLC_UI_P forbidden in class 1 service */ 406 if ((l->llc_dsap == LLC_ISO_LSAP) && 407 (l->llc_ssap == LLC_ISO_LSAP)) { 408 /* LSAP for ISO */ 409 if (m->m_pkthdr.len > etype) 410 m_adj(m, etype - m->m_pkthdr.len); 411 m->m_data += 3; /* XXX */ 412 m->m_len -= 3; /* XXX */ 413 m->m_pkthdr.len -= 3; /* XXX */ 414 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 415 if (m == 0) 416 return; 417 *mtod(m, struct ether_header *) = *eh; 418 #ifdef ARGO_DEBUG 419 if (argo_debug[D_ETHER]) 420 printf("clnp packet"); 421 #endif 422 schednetisr(NETISR_ISO); 423 inq = &clnlintrq; 424 break; 425 } 426 goto dropanyway; 427 428 case LLC_XID: 429 case LLC_XID_P: 430 if(m->m_len < 6) 431 goto dropanyway; 432 l->llc_window = 0; 433 l->llc_fid = 9; 434 l->llc_class = 1; 435 l->llc_dsap = l->llc_ssap = 0; 436 /* Fall through to */ 437 case LLC_TEST: 438 case LLC_TEST_P: 439 { 440 struct sockaddr sa; 441 register struct ether_header *eh2; 442 int i; 443 u_char c = l->llc_dsap; 444 445 l->llc_dsap = l->llc_ssap; 446 l->llc_ssap = c; 447 if (m->m_flags & (M_BCAST | M_MCAST)) 448 bcopy(LLADDR(ifp->if_sadl), 449 (caddr_t)eh->ether_dhost, 6); 450 sa.sa_family = AF_UNSPEC; 451 sa.sa_len = sizeof(sa); 452 eh2 = (struct ether_header *)sa.sa_data; 453 for (i = 0; i < 6; i++) { 454 eh2->ether_shost[i] = c = eh->ether_dhost[i]; 455 eh2->ether_dhost[i] = 456 eh->ether_dhost[i] = eh->ether_shost[i]; 457 eh->ether_shost[i] = c; 458 } 459 ifp->if_output(ifp, m, &sa, NULL); 460 return; 461 } 462 default: 463 m_freem(m); 464 return; 465 } 466 break; 467 #endif /* ISO */ 468 #ifdef LLC 469 case LLC_X25_LSAP: 470 { 471 if (m->m_pkthdr.len > etype) 472 m_adj(m, etype - m->m_pkthdr.len); 473 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 474 if (m == 0) 475 return; 476 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 477 eh->ether_dhost, LLC_X25_LSAP, 6, 478 mtod(m, struct sdl_hdr *))) 479 panic("ETHER cons addr failure"); 480 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 481 #ifdef LLC_DEBUG 482 printf("llc packet\n"); 483 #endif /* LLC_DEBUG */ 484 schednetisr(NETISR_CCITT); 485 inq = &llcintrq; 486 break; 487 } 488 #endif /* LLC */ 489 dropanyway: 490 default: 491 m_freem(m); 492 return; 493 } 494 #else /* ISO || LLC */ 495 m_freem(m); 496 return; 497 #endif /* ISO || LLC */ 498 } 499 500 s = splimp(); 501 if (IF_QFULL(inq)) { 502 IF_DROP(inq); 503 m_freem(m); 504 } else 505 IF_ENQUEUE(inq, m); 506 splx(s); 507 } 508 509 /* 510 * Convert Ethernet address to printable (loggable) representation. 511 */ 512 static char digits[] = "0123456789abcdef"; 513 char * 514 ether_sprintf(ap) 515 register u_char *ap; 516 { 517 register i; 518 static char etherbuf[18]; 519 register char *cp = etherbuf; 520 521 for (i = 0; i < 6; i++) { 522 *cp++ = digits[*ap >> 4]; 523 *cp++ = digits[*ap++ & 0xf]; 524 *cp++ = ':'; 525 } 526 *--cp = 0; 527 return (etherbuf); 528 } 529 530 /* 531 * Perform common duties while attaching to interface list 532 */ 533 void 534 ether_ifattach(ifp, lla) 535 register struct ifnet *ifp; 536 u_int8_t * lla; 537 { 538 register struct sockaddr_dl *sdl; 539 540 ifp->if_type = IFT_ETHER; 541 ifp->if_addrlen = 6; 542 ifp->if_hdrlen = 14; 543 ifp->if_mtu = ETHERMTU; 544 ifp->if_output = ether_output; 545 if ((sdl = ifp->if_sadl) && 546 sdl->sdl_family == AF_LINK) { 547 sdl->sdl_type = IFT_ETHER; 548 sdl->sdl_alen = ifp->if_addrlen; 549 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 550 } 551 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 552 } 553 554 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 555 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 556 /* 557 * Add an Ethernet multicast address or range of addresses to the list for a 558 * given interface. 559 */ 560 int 561 ether_addmulti(ifr, ec) 562 struct ifreq *ifr; 563 register struct ethercom *ec; 564 { 565 register struct ether_multi *enm; 566 struct sockaddr_in *sin; 567 u_char addrlo[6]; 568 u_char addrhi[6]; 569 int s = splimp(); 570 571 switch (ifr->ifr_addr.sa_family) { 572 573 case AF_UNSPEC: 574 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 575 bcopy(addrlo, addrhi, 6); 576 break; 577 578 #ifdef INET 579 case AF_INET: 580 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 581 if (sin->sin_addr.s_addr == INADDR_ANY) { 582 /* 583 * An IP address of INADDR_ANY means listen to all 584 * of the Ethernet multicast addresses used for IP. 585 * (This is for the sake of IP multicast routers.) 586 */ 587 bcopy(ether_ipmulticast_min, addrlo, 6); 588 bcopy(ether_ipmulticast_max, addrhi, 6); 589 } 590 else { 591 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 592 bcopy(addrlo, addrhi, 6); 593 } 594 break; 595 #endif 596 597 default: 598 splx(s); 599 return (EAFNOSUPPORT); 600 } 601 602 /* 603 * Verify that we have valid Ethernet multicast addresses. 604 */ 605 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 606 splx(s); 607 return (EINVAL); 608 } 609 /* 610 * See if the address range is already in the list. 611 */ 612 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 613 if (enm != NULL) { 614 /* 615 * Found it; just increment the reference count. 616 */ 617 ++enm->enm_refcount; 618 splx(s); 619 return (0); 620 } 621 /* 622 * New address or range; malloc a new multicast record 623 * and link it into the interface's multicast list. 624 */ 625 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 626 if (enm == NULL) { 627 splx(s); 628 return (ENOBUFS); 629 } 630 bcopy(addrlo, enm->enm_addrlo, 6); 631 bcopy(addrhi, enm->enm_addrhi, 6); 632 enm->enm_ec = ec; 633 enm->enm_refcount = 1; 634 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 635 ec->ec_multicnt++; 636 splx(s); 637 /* 638 * Return ENETRESET to inform the driver that the list has changed 639 * and its reception filter should be adjusted accordingly. 640 */ 641 return (ENETRESET); 642 } 643 644 /* 645 * Delete a multicast address record. 646 */ 647 int 648 ether_delmulti(ifr, ec) 649 struct ifreq *ifr; 650 register struct ethercom *ec; 651 { 652 register struct ether_multi *enm; 653 struct sockaddr_in *sin; 654 u_char addrlo[6]; 655 u_char addrhi[6]; 656 int s = splimp(); 657 658 switch (ifr->ifr_addr.sa_family) { 659 660 case AF_UNSPEC: 661 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 662 bcopy(addrlo, addrhi, 6); 663 break; 664 665 #ifdef INET 666 case AF_INET: 667 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 668 if (sin->sin_addr.s_addr == INADDR_ANY) { 669 /* 670 * An IP address of INADDR_ANY means stop listening 671 * to the range of Ethernet multicast addresses used 672 * for IP. 673 */ 674 bcopy(ether_ipmulticast_min, addrlo, 6); 675 bcopy(ether_ipmulticast_max, addrhi, 6); 676 } 677 else { 678 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 679 bcopy(addrlo, addrhi, 6); 680 } 681 break; 682 #endif 683 684 default: 685 splx(s); 686 return (EAFNOSUPPORT); 687 } 688 689 /* 690 * Look up the address in our list. 691 */ 692 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 693 if (enm == NULL) { 694 splx(s); 695 return (ENXIO); 696 } 697 if (--enm->enm_refcount != 0) { 698 /* 699 * Still some claims to this record. 700 */ 701 splx(s); 702 return (0); 703 } 704 /* 705 * No remaining claims to this record; unlink and free it. 706 */ 707 LIST_REMOVE(enm, enm_list); 708 free(enm, M_IFMADDR); 709 ec->ec_multicnt--; 710 splx(s); 711 /* 712 * Return ENETRESET to inform the driver that the list has changed 713 * and its reception filter should be adjusted accordingly. 714 */ 715 return (ENETRESET); 716 } 717
Indexes created Tue Sep 30 10:09:55 GMT 2025