if_ethersubr.c revision 1.30
1 /* $NetBSD: if_ethersubr.c,v 1.30 1998/04/29 21:37:53 matt 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 8.2 (Berkeley) 4/4/96 36 */ 37 38 #include "opt_gateway.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/ioctl.h> 48 #include <sys/errno.h> 49 #include <sys/syslog.h> 50 51 #include <machine/cpu.h> 52 53 #include <net/if.h> 54 #include <net/netisr.h> 55 #include <net/route.h> 56 #include <net/if_llc.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 60 #include <net/if_ether.h> 61 62 #include <netinet/in.h> 63 #ifdef INET 64 #include <netinet/in_var.h> 65 #endif 66 #include <netinet/if_inarp.h> 67 68 #ifdef NS 69 #include <netns/ns.h> 70 #include <netns/ns_if.h> 71 #endif 72 73 #ifdef ISO 74 #include <netiso/argo_debug.h> 75 #include <netiso/iso.h> 76 #include <netiso/iso_var.h> 77 #include <netiso/iso_snpac.h> 78 #endif 79 80 #ifdef LLC 81 #include <netccitt/dll.h> 82 #include <netccitt/llc_var.h> 83 #endif 84 85 #if defined(LLC) && defined(CCITT) 86 extern struct ifqueue pkintrq; 87 #endif 88 89 #ifdef NETATALK 90 #include <netatalk/at.h> 91 #include <netatalk/at_var.h> 92 #include <netatalk/at_extern.h> 93 94 #define llc_snap_org_code llc_un.type_snap.org_code 95 #define llc_snap_ether_type llc_un.type_snap.ether_type 96 97 extern u_char at_org_code[3]; 98 extern u_char aarp_org_code[3]; 99 #endif /* NETATALK */ 100 101 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 102 #define senderr(e) { error = (e); goto bad;} 103 104 #define SIN(x) ((struct sockaddr_in *)x) 105 106 /* 107 * Ethernet output routine. 108 * Encapsulate a packet of type family for the local net. 109 * Assumes that ifp is actually pointer to ethercom structure. 110 */ 111 int 112 ether_output(ifp, m0, dst, rt0) 113 struct ifnet *ifp; 114 struct mbuf *m0; 115 struct sockaddr *dst; 116 struct rtentry *rt0; 117 { 118 u_int16_t etype; 119 int s, error = 0; 120 u_char edst[6]; 121 struct mbuf *m = m0; 122 struct rtentry *rt; 123 struct mbuf *mcopy = (struct mbuf *)0; 124 struct ether_header *eh; 125 #ifdef INET 126 struct arphdr *ah; 127 #endif /* INET */ 128 #ifdef NETATALK 129 struct at_ifaddr *aa; 130 #endif /* NETATALK */ 131 132 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 133 senderr(ENETDOWN); 134 ifp->if_lastchange = time; 135 if ((rt = rt0) != NULL) { 136 if ((rt->rt_flags & RTF_UP) == 0) { 137 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 138 rt->rt_refcnt--; 139 if (rt->rt_ifp != ifp) 140 return (*rt->rt_ifp->if_output) 141 (ifp, m0, dst, rt); 142 } else 143 senderr(EHOSTUNREACH); 144 } 145 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 146 if (rt->rt_gwroute == 0) 147 goto lookup; 148 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 149 rtfree(rt); rt = rt0; 150 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 151 if ((rt = rt->rt_gwroute) == 0) 152 senderr(EHOSTUNREACH); 153 /* the "G" test below also prevents rt == rt0 */ 154 if ((rt->rt_flags & RTF_GATEWAY) || 155 (rt->rt_ifp != ifp)) { 156 rt->rt_refcnt--; 157 rt0->rt_gwroute = 0; 158 senderr(EHOSTUNREACH); 159 } 160 } 161 } 162 if (rt->rt_flags & RTF_REJECT) 163 if (rt->rt_rmx.rmx_expire == 0 || 164 time.tv_sec < rt->rt_rmx.rmx_expire) 165 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 166 } 167 switch (dst->sa_family) { 168 169 #ifdef INET 170 case AF_INET: 171 if (m->m_flags & M_BCAST) 172 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 173 sizeof(edst)); 174 175 else if (m->m_flags & M_MCAST) { 176 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 177 (caddr_t)edst) 178 179 } else if (!arpresolve(ifp, rt, m, dst, edst)) 180 return (0); /* if not yet resolved */ 181 /* If broadcasting on a simplex interface, loopback a copy */ 182 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 183 mcopy = m_copy(m, 0, (int)M_COPYALL); 184 etype = htons(ETHERTYPE_IP); 185 break; 186 187 case AF_ARP: 188 ah = mtod(m, struct arphdr *); 189 if (m->m_flags & M_BCAST) 190 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 191 sizeof(edst)); 192 else 193 bcopy((caddr_t)ar_tha(ah), 194 (caddr_t)edst, sizeof(edst)); 195 196 ah->ar_hrd = htons(ARPHRD_ETHER); 197 198 switch(ntohs(ah->ar_op)) { 199 case ARPOP_REVREQUEST: 200 case ARPOP_REVREPLY: 201 etype = htons(ETHERTYPE_REVARP); 202 break; 203 204 case ARPOP_REQUEST: 205 case ARPOP_REPLY: 206 default: 207 etype = htons(ETHERTYPE_ARP); 208 } 209 210 break; 211 #endif 212 #ifdef NETATALK 213 case AF_APPLETALK: 214 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 215 #ifdef NETATALKDEBUG 216 printf("aarpresolv failed\n"); 217 #endif /* NETATALKDEBUG */ 218 return (0); 219 } 220 /* 221 * ifaddr is the first thing in at_ifaddr 222 */ 223 aa = (struct at_ifaddr *) at_ifawithnet( 224 (struct sockaddr_at *)dst, ifp); 225 if (aa == NULL) 226 goto bad; 227 228 /* 229 * In the phase 2 case, we need to prepend an mbuf for the 230 * llc header. Since we must preserve the value of m, 231 * which is passed to us by value, we m_copy() the first 232 * mbuf, and use it for our llc header. 233 */ 234 if (aa->aa_flags & AFA_PHASE2) { 235 struct llc llc; 236 237 M_PREPEND(m, sizeof(struct llc), M_WAIT); 238 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 239 llc.llc_control = LLC_UI; 240 bcopy(at_org_code, llc.llc_snap_org_code, 241 sizeof(llc.llc_snap_org_code)); 242 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 243 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 244 etype = htons(m->m_pkthdr.len); 245 } else { 246 etype = htons(ETHERTYPE_AT); 247 } 248 break; 249 #endif /* NETATALK */ 250 #ifdef NS 251 case AF_NS: 252 etype = htons(ETHERTYPE_NS); 253 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 254 (caddr_t)edst, sizeof (edst)); 255 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 256 return (looutput(ifp, m, dst, rt)); 257 /* If broadcasting on a simplex interface, loopback a copy */ 258 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 259 mcopy = m_copy(m, 0, (int)M_COPYALL); 260 break; 261 #endif 262 #ifdef ISO 263 case AF_ISO: { 264 int snpalen; 265 struct llc *l; 266 struct sockaddr_dl *sdl; 267 268 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 269 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 270 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 271 } else { 272 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 273 (char *)edst, &snpalen); 274 if (error) 275 goto bad; /* Not Resolved */ 276 } 277 /* If broadcasting on a simplex interface, loopback a copy */ 278 if (*edst & 1) 279 m->m_flags |= (M_BCAST|M_MCAST); 280 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 281 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 282 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 283 if (mcopy) { 284 eh = mtod(mcopy, struct ether_header *); 285 bcopy((caddr_t)edst, 286 (caddr_t)eh->ether_dhost, sizeof (edst)); 287 bcopy(LLADDR(ifp->if_sadl), 288 (caddr_t)eh->ether_shost, sizeof (edst)); 289 } 290 } 291 M_PREPEND(m, 3, M_DONTWAIT); 292 if (m == NULL) 293 return (0); 294 etype = htons(m->m_pkthdr.len); 295 l = mtod(m, struct llc *); 296 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 297 l->llc_control = LLC_UI; 298 #ifdef ARGO_DEBUG 299 if (argo_debug[D_ETHER]) { 300 int i; 301 printf("unoutput: sending pkt to: "); 302 for (i=0; i<6; i++) 303 printf("%x ", edst[i] & 0xff); 304 printf("\n"); 305 } 306 #endif 307 } break; 308 #endif /* ISO */ 309 #ifdef LLC 310 /* case AF_NSAP: */ 311 case AF_CCITT: { 312 struct sockaddr_dl *sdl = 313 (struct sockaddr_dl *) rt -> rt_gateway; 314 315 if (sdl && sdl->sdl_family == AF_LINK 316 && sdl->sdl_alen > 0) { 317 bcopy(LLADDR(sdl), (char *)edst, 318 sizeof(edst)); 319 } else goto bad; /* Not a link interface ? Funny ... */ 320 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 321 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 322 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 323 if (mcopy) { 324 eh = mtod(mcopy, struct ether_header *); 325 bcopy((caddr_t)edst, 326 (caddr_t)eh->ether_dhost, sizeof (edst)); 327 bcopy(LLADDR(ifp->if_sadl), 328 (caddr_t)eh->ether_shost, sizeof (edst)); 329 } 330 } 331 etype = htons(m->m_pkthdr.len); 332 #ifdef LLC_DEBUG 333 { 334 int i; 335 struct llc *l = mtod(m, struct llc *); 336 337 printf("ether_output: sending LLC2 pkt to: "); 338 for (i=0; i<6; i++) 339 printf("%x ", edst[i] & 0xff); 340 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 341 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 342 l->llc_control & 0xff); 343 344 } 345 #endif /* LLC_DEBUG */ 346 } break; 347 #endif /* LLC */ 348 349 case AF_UNSPEC: 350 eh = (struct ether_header *)dst->sa_data; 351 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 352 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 353 etype = eh->ether_type; 354 break; 355 356 default: 357 printf("%s: can't handle af%d\n", ifp->if_xname, 358 dst->sa_family); 359 senderr(EAFNOSUPPORT); 360 } 361 362 if (mcopy) 363 (void) looutput(ifp, mcopy, dst, rt); 364 365 /* 366 * Add local net header. If no space in first mbuf, 367 * allocate another. 368 */ 369 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 370 if (m == 0) 371 senderr(ENOBUFS); 372 eh = mtod(m, struct ether_header *); 373 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 374 sizeof(eh->ether_type)); 375 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 376 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 377 sizeof(eh->ether_shost)); 378 s = splimp(); 379 /* 380 * Queue message on interface, and start output if interface 381 * not yet active. 382 */ 383 if (IF_QFULL(&ifp->if_snd)) { 384 IF_DROP(&ifp->if_snd); 385 splx(s); 386 senderr(ENOBUFS); 387 } 388 ifp->if_obytes += m->m_pkthdr.len; 389 IF_ENQUEUE(&ifp->if_snd, m); 390 if ((ifp->if_flags & IFF_OACTIVE) == 0) 391 (*ifp->if_start)(ifp); 392 splx(s); 393 if (m->m_flags & M_MCAST) 394 ifp->if_omcasts++; 395 return (error); 396 397 bad: 398 if (m) 399 m_freem(m); 400 return (error); 401 } 402 403 /* 404 * Process a received Ethernet packet; 405 * the packet is in the mbuf chain m without 406 * the ether header, which is provided separately. 407 */ 408 void 409 ether_input(ifp, eh, m) 410 struct ifnet *ifp; 411 struct ether_header *eh; 412 struct mbuf *m; 413 { 414 struct ifqueue *inq; 415 u_int16_t etype; 416 int s; 417 #if defined (ISO) || defined (LLC) || defined(NETATALK) 418 struct llc *l; 419 #endif 420 421 if ((ifp->if_flags & IFF_UP) == 0) { 422 m_freem(m); 423 return; 424 } 425 ifp->if_lastchange = time; 426 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 427 if (eh->ether_dhost[0] & 1) { 428 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 429 sizeof(etherbroadcastaddr)) == 0) 430 m->m_flags |= M_BCAST; 431 else 432 m->m_flags |= M_MCAST; 433 } 434 if (m->m_flags & (M_BCAST|M_MCAST)) 435 ifp->if_imcasts++; 436 437 etype = ntohs(eh->ether_type); 438 switch (etype) { 439 #ifdef INET 440 case ETHERTYPE_IP: 441 #ifdef GATEWAY 442 if (ipflow_fastforward(m)) 443 return; 444 #endif 445 schednetisr(NETISR_IP); 446 inq = &ipintrq; 447 break; 448 449 case ETHERTYPE_ARP: 450 schednetisr(NETISR_ARP); 451 inq = &arpintrq; 452 break; 453 454 case ETHERTYPE_REVARP: 455 revarpinput(m); /* XXX queue? */ 456 return; 457 #endif 458 #ifdef NS 459 case ETHERTYPE_NS: 460 schednetisr(NETISR_NS); 461 inq = &nsintrq; 462 break; 463 464 #endif 465 #ifdef NETATALK 466 case ETHERTYPE_AT: 467 schednetisr(NETISR_ATALK); 468 inq = &atintrq1; 469 break; 470 case ETHERTYPE_AARP: 471 /* probably this should be done with a NETISR as well */ 472 aarpinput(ifp, m); /* XXX */ 473 return; 474 #endif /* NETATALK */ 475 default: 476 #if defined (ISO) || defined (LLC) || defined (NETATALK) 477 if (etype > ETHERMTU) 478 goto dropanyway; 479 l = mtod(m, struct llc *); 480 switch (l->llc_dsap) { 481 #ifdef NETATALK 482 case LLC_SNAP_LSAP: 483 switch (l->llc_control) { 484 case LLC_UI: 485 if (l->llc_ssap != LLC_SNAP_LSAP) { 486 goto dropanyway; 487 } 488 489 if (Bcmp(&(l->llc_snap_org_code)[0], 490 at_org_code, sizeof(at_org_code)) == 0 && 491 ntohs(l->llc_snap_ether_type) == 492 ETHERTYPE_AT) { 493 inq = &atintrq2; 494 m_adj(m, sizeof(struct llc)); 495 schednetisr(NETISR_ATALK); 496 break; 497 } 498 499 if (Bcmp(&(l->llc_snap_org_code)[0], 500 aarp_org_code, 501 sizeof(aarp_org_code)) == 0 && 502 ntohs(l->llc_snap_ether_type) == 503 ETHERTYPE_AARP) { 504 m_adj( m, sizeof(struct llc)); 505 aarpinput(ifp, m); /* XXX */ 506 return; 507 } 508 509 default: 510 goto dropanyway; 511 } 512 break; 513 #endif /* NETATALK */ 514 #ifdef ISO 515 case LLC_ISO_LSAP: 516 switch (l->llc_control) { 517 case LLC_UI: 518 /* LLC_UI_P forbidden in class 1 service */ 519 if ((l->llc_dsap == LLC_ISO_LSAP) && 520 (l->llc_ssap == LLC_ISO_LSAP)) { 521 /* LSAP for ISO */ 522 if (m->m_pkthdr.len > etype) 523 m_adj(m, etype - m->m_pkthdr.len); 524 m->m_data += 3; /* XXX */ 525 m->m_len -= 3; /* XXX */ 526 m->m_pkthdr.len -= 3; /* XXX */ 527 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 528 if (m == 0) 529 return; 530 *mtod(m, struct ether_header *) = *eh; 531 #ifdef ARGO_DEBUG 532 if (argo_debug[D_ETHER]) 533 printf("clnp packet"); 534 #endif 535 schednetisr(NETISR_ISO); 536 inq = &clnlintrq; 537 break; 538 } 539 goto dropanyway; 540 541 case LLC_XID: 542 case LLC_XID_P: 543 if(m->m_len < 6) 544 goto dropanyway; 545 l->llc_window = 0; 546 l->llc_fid = 9; 547 l->llc_class = 1; 548 l->llc_dsap = l->llc_ssap = 0; 549 /* Fall through to */ 550 case LLC_TEST: 551 case LLC_TEST_P: 552 { 553 struct sockaddr sa; 554 struct ether_header *eh2; 555 int i; 556 u_char c = l->llc_dsap; 557 558 l->llc_dsap = l->llc_ssap; 559 l->llc_ssap = c; 560 if (m->m_flags & (M_BCAST | M_MCAST)) 561 bcopy(LLADDR(ifp->if_sadl), 562 (caddr_t)eh->ether_dhost, 6); 563 sa.sa_family = AF_UNSPEC; 564 sa.sa_len = sizeof(sa); 565 eh2 = (struct ether_header *)sa.sa_data; 566 for (i = 0; i < 6; i++) { 567 eh2->ether_shost[i] = c = 568 eh->ether_dhost[i]; 569 eh2->ether_dhost[i] = 570 eh->ether_dhost[i] = 571 eh->ether_shost[i]; 572 eh->ether_shost[i] = c; 573 } 574 ifp->if_output(ifp, m, &sa, NULL); 575 return; 576 } 577 default: 578 m_freem(m); 579 return; 580 } 581 break; 582 #endif /* ISO */ 583 #ifdef LLC 584 case LLC_X25_LSAP: 585 { 586 if (m->m_pkthdr.len > etype) 587 m_adj(m, etype - m->m_pkthdr.len); 588 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 589 if (m == 0) 590 return; 591 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 592 eh->ether_dhost, LLC_X25_LSAP, 6, 593 mtod(m, struct sdl_hdr *))) 594 panic("ETHER cons addr failure"); 595 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 596 #ifdef LLC_DEBUG 597 printf("llc packet\n"); 598 #endif /* LLC_DEBUG */ 599 schednetisr(NETISR_CCITT); 600 inq = &llcintrq; 601 break; 602 } 603 #endif /* LLC */ 604 dropanyway: 605 default: 606 m_freem(m); 607 return; 608 } 609 #else /* ISO || LLC || NETATALK*/ 610 m_freem(m); 611 return; 612 #endif /* ISO || LLC || NETATALK*/ 613 } 614 615 s = splimp(); 616 if (IF_QFULL(inq)) { 617 IF_DROP(inq); 618 m_freem(m); 619 } else 620 IF_ENQUEUE(inq, m); 621 splx(s); 622 } 623 624 /* 625 * Convert Ethernet address to printable (loggable) representation. 626 */ 627 static char digits[] = "0123456789abcdef"; 628 char * 629 ether_sprintf(ap) 630 u_char *ap; 631 { 632 static char etherbuf[18]; 633 char *cp = etherbuf; 634 int i; 635 636 for (i = 0; i < 6; i++) { 637 *cp++ = digits[*ap >> 4]; 638 *cp++ = digits[*ap++ & 0xf]; 639 *cp++ = ':'; 640 } 641 *--cp = 0; 642 return (etherbuf); 643 } 644 645 /* 646 * Perform common duties while attaching to interface list 647 */ 648 void 649 ether_ifattach(ifp, lla) 650 struct ifnet *ifp; 651 u_int8_t * lla; 652 { 653 struct sockaddr_dl *sdl; 654 655 ifp->if_type = IFT_ETHER; 656 ifp->if_addrlen = 6; 657 ifp->if_hdrlen = 14; 658 ifp->if_mtu = ETHERMTU; 659 ifp->if_output = ether_output; 660 if ((sdl = ifp->if_sadl) && 661 sdl->sdl_family == AF_LINK) { 662 sdl->sdl_type = IFT_ETHER; 663 sdl->sdl_alen = ifp->if_addrlen; 664 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 665 } 666 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 667 ifp->if_broadcastaddr = etherbroadcastaddr; 668 } 669 670 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 671 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 672 /* 673 * Add an Ethernet multicast address or range of addresses to the list for a 674 * given interface. 675 */ 676 int 677 ether_addmulti(ifr, ec) 678 struct ifreq *ifr; 679 struct ethercom *ec; 680 { 681 struct ether_multi *enm; 682 #ifdef INET 683 struct sockaddr_in *sin; 684 #endif /* INET */ 685 u_char addrlo[6]; 686 u_char addrhi[6]; 687 int s = splimp(); 688 689 switch (ifr->ifr_addr.sa_family) { 690 691 case AF_UNSPEC: 692 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 693 bcopy(addrlo, addrhi, 6); 694 break; 695 696 #ifdef INET 697 case AF_INET: 698 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 699 if (sin->sin_addr.s_addr == INADDR_ANY) { 700 /* 701 * An IP address of INADDR_ANY means listen to all 702 * of the Ethernet multicast addresses used for IP. 703 * (This is for the sake of IP multicast routers.) 704 */ 705 bcopy(ether_ipmulticast_min, addrlo, 6); 706 bcopy(ether_ipmulticast_max, addrhi, 6); 707 } 708 else { 709 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 710 bcopy(addrlo, addrhi, 6); 711 } 712 break; 713 #endif 714 715 default: 716 splx(s); 717 return (EAFNOSUPPORT); 718 } 719 720 /* 721 * Verify that we have valid Ethernet multicast addresses. 722 */ 723 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 724 splx(s); 725 return (EINVAL); 726 } 727 /* 728 * See if the address range is already in the list. 729 */ 730 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 731 if (enm != NULL) { 732 /* 733 * Found it; just increment the reference count. 734 */ 735 ++enm->enm_refcount; 736 splx(s); 737 return (0); 738 } 739 /* 740 * New address or range; malloc a new multicast record 741 * and link it into the interface's multicast list. 742 */ 743 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 744 if (enm == NULL) { 745 splx(s); 746 return (ENOBUFS); 747 } 748 bcopy(addrlo, enm->enm_addrlo, 6); 749 bcopy(addrhi, enm->enm_addrhi, 6); 750 enm->enm_ec = ec; 751 enm->enm_refcount = 1; 752 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 753 ec->ec_multicnt++; 754 splx(s); 755 /* 756 * Return ENETRESET to inform the driver that the list has changed 757 * and its reception filter should be adjusted accordingly. 758 */ 759 return (ENETRESET); 760 } 761 762 /* 763 * Delete a multicast address record. 764 */ 765 int 766 ether_delmulti(ifr, ec) 767 struct ifreq *ifr; 768 struct ethercom *ec; 769 { 770 struct ether_multi *enm; 771 #ifdef INET 772 struct sockaddr_in *sin; 773 #endif /* INET */ 774 u_char addrlo[6]; 775 u_char addrhi[6]; 776 int s = splimp(); 777 778 switch (ifr->ifr_addr.sa_family) { 779 780 case AF_UNSPEC: 781 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 782 bcopy(addrlo, addrhi, 6); 783 break; 784 785 #ifdef INET 786 case AF_INET: 787 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 788 if (sin->sin_addr.s_addr == INADDR_ANY) { 789 /* 790 * An IP address of INADDR_ANY means stop listening 791 * to the range of Ethernet multicast addresses used 792 * for IP. 793 */ 794 bcopy(ether_ipmulticast_min, addrlo, 6); 795 bcopy(ether_ipmulticast_max, addrhi, 6); 796 } 797 else { 798 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 799 bcopy(addrlo, addrhi, 6); 800 } 801 break; 802 #endif 803 804 default: 805 splx(s); 806 return (EAFNOSUPPORT); 807 } 808 809 /* 810 * Look up the address in our list. 811 */ 812 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 813 if (enm == NULL) { 814 splx(s); 815 return (ENXIO); 816 } 817 if (--enm->enm_refcount != 0) { 818 /* 819 * Still some claims to this record. 820 */ 821 splx(s); 822 return (0); 823 } 824 /* 825 * No remaining claims to this record; unlink and free it. 826 */ 827 LIST_REMOVE(enm, enm_list); 828 free(enm, M_IFMADDR); 829 ec->ec_multicnt--; 830 splx(s); 831 /* 832 * Return ENETRESET to inform the driver that the list has changed 833 * and its reception filter should be adjusted accordingly. 834 */ 835 return (ENETRESET); 836 } 837
Indexes created Sun Sep 21 20:09:37 GMT 2025