if_ethersubr.c revision 1.32
1 /* $NetBSD: if_ethersubr.c,v 1.32 1998/05/04 12:54:22 christos 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 IPX 74 #include <netipx/ipx.h> 75 #include <netipx/ipx_if.h> 76 #endif 77 78 #ifdef ISO 79 #include <netiso/argo_debug.h> 80 #include <netiso/iso.h> 81 #include <netiso/iso_var.h> 82 #include <netiso/iso_snpac.h> 83 #endif 84 85 #ifdef LLC 86 #include <netccitt/dll.h> 87 #include <netccitt/llc_var.h> 88 #endif 89 90 #if defined(LLC) && defined(CCITT) 91 extern struct ifqueue pkintrq; 92 #endif 93 94 #ifdef NETATALK 95 #include <netatalk/at.h> 96 #include <netatalk/at_var.h> 97 #include <netatalk/at_extern.h> 98 99 #define llc_snap_org_code llc_un.type_snap.org_code 100 #define llc_snap_ether_type llc_un.type_snap.ether_type 101 102 extern u_char at_org_code[3]; 103 extern u_char aarp_org_code[3]; 104 #endif /* NETATALK */ 105 106 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 107 #define senderr(e) { error = (e); goto bad;} 108 109 #define SIN(x) ((struct sockaddr_in *)x) 110 111 /* 112 * Ethernet output routine. 113 * Encapsulate a packet of type family for the local net. 114 * Assumes that ifp is actually pointer to ethercom structure. 115 */ 116 int 117 ether_output(ifp, m0, dst, rt0) 118 struct ifnet *ifp; 119 struct mbuf *m0; 120 struct sockaddr *dst; 121 struct rtentry *rt0; 122 { 123 u_int16_t etype; 124 int s, error = 0, hdrcmplt = 0; 125 u_char esrc[6], edst[6]; 126 struct mbuf *m = m0; 127 struct rtentry *rt; 128 struct mbuf *mcopy = (struct mbuf *)0; 129 struct ether_header *eh; 130 #ifdef INET 131 struct arphdr *ah; 132 #endif /* INET */ 133 #ifdef NETATALK 134 struct at_ifaddr *aa; 135 #endif /* NETATALK */ 136 137 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 138 senderr(ENETDOWN); 139 ifp->if_lastchange = time; 140 if ((rt = rt0) != NULL) { 141 if ((rt->rt_flags & RTF_UP) == 0) { 142 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 143 rt->rt_refcnt--; 144 if (rt->rt_ifp != ifp) 145 return (*rt->rt_ifp->if_output) 146 (ifp, m0, dst, rt); 147 } else 148 senderr(EHOSTUNREACH); 149 } 150 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 151 if (rt->rt_gwroute == 0) 152 goto lookup; 153 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 154 rtfree(rt); rt = rt0; 155 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 156 if ((rt = rt->rt_gwroute) == 0) 157 senderr(EHOSTUNREACH); 158 /* the "G" test below also prevents rt == rt0 */ 159 if ((rt->rt_flags & RTF_GATEWAY) || 160 (rt->rt_ifp != ifp)) { 161 rt->rt_refcnt--; 162 rt0->rt_gwroute = 0; 163 senderr(EHOSTUNREACH); 164 } 165 } 166 } 167 if (rt->rt_flags & RTF_REJECT) 168 if (rt->rt_rmx.rmx_expire == 0 || 169 time.tv_sec < rt->rt_rmx.rmx_expire) 170 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 171 } 172 switch (dst->sa_family) { 173 174 #ifdef INET 175 case AF_INET: 176 if (m->m_flags & M_BCAST) 177 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 178 sizeof(edst)); 179 180 else if (m->m_flags & M_MCAST) { 181 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 182 (caddr_t)edst) 183 184 } else if (!arpresolve(ifp, rt, m, dst, edst)) 185 return (0); /* if not yet resolved */ 186 /* If broadcasting on a simplex interface, loopback a copy */ 187 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 188 mcopy = m_copy(m, 0, (int)M_COPYALL); 189 etype = htons(ETHERTYPE_IP); 190 break; 191 192 case AF_ARP: 193 ah = mtod(m, struct arphdr *); 194 if (m->m_flags & M_BCAST) 195 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 196 sizeof(edst)); 197 else 198 bcopy((caddr_t)ar_tha(ah), 199 (caddr_t)edst, sizeof(edst)); 200 201 ah->ar_hrd = htons(ARPHRD_ETHER); 202 203 switch(ntohs(ah->ar_op)) { 204 case ARPOP_REVREQUEST: 205 case ARPOP_REVREPLY: 206 etype = htons(ETHERTYPE_REVARP); 207 break; 208 209 case ARPOP_REQUEST: 210 case ARPOP_REPLY: 211 default: 212 etype = htons(ETHERTYPE_ARP); 213 } 214 215 break; 216 #endif 217 #ifdef NETATALK 218 case AF_APPLETALK: 219 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 220 #ifdef NETATALKDEBUG 221 printf("aarpresolv failed\n"); 222 #endif /* NETATALKDEBUG */ 223 return (0); 224 } 225 /* 226 * ifaddr is the first thing in at_ifaddr 227 */ 228 aa = (struct at_ifaddr *) at_ifawithnet( 229 (struct sockaddr_at *)dst, ifp); 230 if (aa == NULL) 231 goto bad; 232 233 /* 234 * In the phase 2 case, we need to prepend an mbuf for the 235 * llc header. Since we must preserve the value of m, 236 * which is passed to us by value, we m_copy() the first 237 * mbuf, and use it for our llc header. 238 */ 239 if (aa->aa_flags & AFA_PHASE2) { 240 struct llc llc; 241 242 M_PREPEND(m, sizeof(struct llc), M_WAIT); 243 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 244 llc.llc_control = LLC_UI; 245 bcopy(at_org_code, llc.llc_snap_org_code, 246 sizeof(llc.llc_snap_org_code)); 247 llc.llc_snap_ether_type = htons(ETHERTYPE_AT); 248 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 249 etype = htons(m->m_pkthdr.len); 250 } else { 251 etype = htons(ETHERTYPE_AT); 252 } 253 break; 254 #endif /* NETATALK */ 255 #ifdef NS 256 case AF_NS: 257 etype = htons(ETHERTYPE_NS); 258 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 259 (caddr_t)edst, sizeof (edst)); 260 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 261 return (looutput(ifp, m, dst, rt)); 262 /* If broadcasting on a simplex interface, loopback a copy */ 263 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 264 mcopy = m_copy(m, 0, (int)M_COPYALL); 265 break; 266 #endif 267 #ifdef IPX 268 case AF_IPX: 269 etype = ETHERTYPE_IPX; 270 bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host, 271 (caddr_t)edst, sizeof (edst)); 272 if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst))) 273 return (looutput(ifp, m, dst, rt)); 274 /* If broadcasting on a simplex interface, loopback a copy */ 275 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 276 mcopy = m_copy(m, 0, (int)M_COPYALL); 277 break; 278 #endif 279 #ifdef ISO 280 case AF_ISO: { 281 int snpalen; 282 struct llc *l; 283 struct sockaddr_dl *sdl; 284 285 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 286 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 287 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 288 } else { 289 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 290 (char *)edst, &snpalen); 291 if (error) 292 goto bad; /* Not Resolved */ 293 } 294 /* If broadcasting on a simplex interface, loopback a copy */ 295 if (*edst & 1) 296 m->m_flags |= (M_BCAST|M_MCAST); 297 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 298 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 299 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 300 if (mcopy) { 301 eh = mtod(mcopy, struct ether_header *); 302 bcopy((caddr_t)edst, 303 (caddr_t)eh->ether_dhost, sizeof (edst)); 304 bcopy(LLADDR(ifp->if_sadl), 305 (caddr_t)eh->ether_shost, sizeof (edst)); 306 } 307 } 308 M_PREPEND(m, 3, M_DONTWAIT); 309 if (m == NULL) 310 return (0); 311 etype = htons(m->m_pkthdr.len); 312 l = mtod(m, struct llc *); 313 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 314 l->llc_control = LLC_UI; 315 #ifdef ARGO_DEBUG 316 if (argo_debug[D_ETHER]) { 317 int i; 318 printf("unoutput: sending pkt to: "); 319 for (i=0; i<6; i++) 320 printf("%x ", edst[i] & 0xff); 321 printf("\n"); 322 } 323 #endif 324 } break; 325 #endif /* ISO */ 326 #ifdef LLC 327 /* case AF_NSAP: */ 328 case AF_CCITT: { 329 struct sockaddr_dl *sdl = 330 (struct sockaddr_dl *) rt -> rt_gateway; 331 332 if (sdl && sdl->sdl_family == AF_LINK 333 && sdl->sdl_alen > 0) { 334 bcopy(LLADDR(sdl), (char *)edst, 335 sizeof(edst)); 336 } else goto bad; /* Not a link interface ? Funny ... */ 337 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 338 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 339 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 340 if (mcopy) { 341 eh = mtod(mcopy, struct ether_header *); 342 bcopy((caddr_t)edst, 343 (caddr_t)eh->ether_dhost, sizeof (edst)); 344 bcopy(LLADDR(ifp->if_sadl), 345 (caddr_t)eh->ether_shost, sizeof (edst)); 346 } 347 } 348 etype = htons(m->m_pkthdr.len); 349 #ifdef LLC_DEBUG 350 { 351 int i; 352 struct llc *l = mtod(m, struct llc *); 353 354 printf("ether_output: sending LLC2 pkt to: "); 355 for (i=0; i<6; i++) 356 printf("%x ", edst[i] & 0xff); 357 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 358 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 359 l->llc_control & 0xff); 360 361 } 362 #endif /* LLC_DEBUG */ 363 } break; 364 #endif /* LLC */ 365 366 case pseudo_AF_HDRCMPLT: 367 hdrcmplt = 1; 368 eh = (struct ether_header *)dst->sa_data; 369 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 370 /* FALLTHROUGH */ 371 372 case AF_UNSPEC: 373 eh = (struct ether_header *)dst->sa_data; 374 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 375 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 376 etype = eh->ether_type; 377 break; 378 379 default: 380 printf("%s: can't handle af%d\n", ifp->if_xname, 381 dst->sa_family); 382 senderr(EAFNOSUPPORT); 383 } 384 385 if (mcopy) 386 (void) looutput(ifp, mcopy, dst, rt); 387 388 /* 389 * Add local net header. If no space in first mbuf, 390 * allocate another. 391 */ 392 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 393 if (m == 0) 394 senderr(ENOBUFS); 395 eh = mtod(m, struct ether_header *); 396 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 397 sizeof(eh->ether_type)); 398 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 399 if (hdrcmplt) 400 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 401 sizeof(eh->ether_shost)); 402 else 403 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 404 sizeof(eh->ether_shost)); 405 s = splimp(); 406 /* 407 * Queue message on interface, and start output if interface 408 * not yet active. 409 */ 410 if (IF_QFULL(&ifp->if_snd)) { 411 IF_DROP(&ifp->if_snd); 412 splx(s); 413 senderr(ENOBUFS); 414 } 415 ifp->if_obytes += m->m_pkthdr.len; 416 IF_ENQUEUE(&ifp->if_snd, m); 417 if ((ifp->if_flags & IFF_OACTIVE) == 0) 418 (*ifp->if_start)(ifp); 419 splx(s); 420 if (m->m_flags & M_MCAST) 421 ifp->if_omcasts++; 422 return (error); 423 424 bad: 425 if (m) 426 m_freem(m); 427 return (error); 428 } 429 430 /* 431 * Process a received Ethernet packet; 432 * the packet is in the mbuf chain m without 433 * the ether header, which is provided separately. 434 */ 435 void 436 ether_input(ifp, eh, m) 437 struct ifnet *ifp; 438 struct ether_header *eh; 439 struct mbuf *m; 440 { 441 struct ifqueue *inq; 442 u_int16_t etype; 443 int s; 444 #if defined (ISO) || defined (LLC) || defined(NETATALK) 445 struct llc *l; 446 #endif 447 448 if ((ifp->if_flags & IFF_UP) == 0) { 449 m_freem(m); 450 return; 451 } 452 ifp->if_lastchange = time; 453 ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); 454 if (eh->ether_dhost[0] & 1) { 455 if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, 456 sizeof(etherbroadcastaddr)) == 0) 457 m->m_flags |= M_BCAST; 458 else 459 m->m_flags |= M_MCAST; 460 } 461 if (m->m_flags & (M_BCAST|M_MCAST)) 462 ifp->if_imcasts++; 463 464 etype = ntohs(eh->ether_type); 465 switch (etype) { 466 #ifdef INET 467 case ETHERTYPE_IP: 468 #ifdef GATEWAY 469 if (ipflow_fastforward(m)) 470 return; 471 #endif 472 schednetisr(NETISR_IP); 473 inq = &ipintrq; 474 break; 475 476 case ETHERTYPE_ARP: 477 schednetisr(NETISR_ARP); 478 inq = &arpintrq; 479 break; 480 481 case ETHERTYPE_REVARP: 482 revarpinput(m); /* XXX queue? */ 483 return; 484 #endif 485 #ifdef NS 486 case ETHERTYPE_NS: 487 schednetisr(NETISR_NS); 488 inq = &nsintrq; 489 break; 490 491 #endif 492 #ifdef IPX 493 case ETHERTYPE_IPX: 494 schednetisr(NETISR_IPX); 495 inq = &ipxintrq; 496 break; 497 #endif 498 #ifdef NETATALK 499 case ETHERTYPE_AT: 500 schednetisr(NETISR_ATALK); 501 inq = &atintrq1; 502 break; 503 case ETHERTYPE_AARP: 504 /* probably this should be done with a NETISR as well */ 505 aarpinput(ifp, m); /* XXX */ 506 return; 507 #endif /* NETATALK */ 508 default: 509 #if defined (ISO) || defined (LLC) || defined (NETATALK) 510 if (etype > ETHERMTU) 511 goto dropanyway; 512 l = mtod(m, struct llc *); 513 switch (l->llc_dsap) { 514 #ifdef NETATALK 515 case LLC_SNAP_LSAP: 516 switch (l->llc_control) { 517 case LLC_UI: 518 if (l->llc_ssap != LLC_SNAP_LSAP) { 519 goto dropanyway; 520 } 521 522 if (Bcmp(&(l->llc_snap_org_code)[0], 523 at_org_code, sizeof(at_org_code)) == 0 && 524 ntohs(l->llc_snap_ether_type) == 525 ETHERTYPE_AT) { 526 inq = &atintrq2; 527 m_adj(m, sizeof(struct llc)); 528 schednetisr(NETISR_ATALK); 529 break; 530 } 531 532 if (Bcmp(&(l->llc_snap_org_code)[0], 533 aarp_org_code, 534 sizeof(aarp_org_code)) == 0 && 535 ntohs(l->llc_snap_ether_type) == 536 ETHERTYPE_AARP) { 537 m_adj( m, sizeof(struct llc)); 538 aarpinput(ifp, m); /* XXX */ 539 return; 540 } 541 542 default: 543 goto dropanyway; 544 } 545 break; 546 #endif /* NETATALK */ 547 #ifdef ISO 548 case LLC_ISO_LSAP: 549 switch (l->llc_control) { 550 case LLC_UI: 551 /* LLC_UI_P forbidden in class 1 service */ 552 if ((l->llc_dsap == LLC_ISO_LSAP) && 553 (l->llc_ssap == LLC_ISO_LSAP)) { 554 /* LSAP for ISO */ 555 if (m->m_pkthdr.len > etype) 556 m_adj(m, etype - m->m_pkthdr.len); 557 m->m_data += 3; /* XXX */ 558 m->m_len -= 3; /* XXX */ 559 m->m_pkthdr.len -= 3; /* XXX */ 560 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 561 if (m == 0) 562 return; 563 *mtod(m, struct ether_header *) = *eh; 564 #ifdef ARGO_DEBUG 565 if (argo_debug[D_ETHER]) 566 printf("clnp packet"); 567 #endif 568 schednetisr(NETISR_ISO); 569 inq = &clnlintrq; 570 break; 571 } 572 goto dropanyway; 573 574 case LLC_XID: 575 case LLC_XID_P: 576 if(m->m_len < 6) 577 goto dropanyway; 578 l->llc_window = 0; 579 l->llc_fid = 9; 580 l->llc_class = 1; 581 l->llc_dsap = l->llc_ssap = 0; 582 /* Fall through to */ 583 case LLC_TEST: 584 case LLC_TEST_P: 585 { 586 struct sockaddr sa; 587 struct ether_header *eh2; 588 int i; 589 u_char c = l->llc_dsap; 590 591 l->llc_dsap = l->llc_ssap; 592 l->llc_ssap = c; 593 if (m->m_flags & (M_BCAST | M_MCAST)) 594 bcopy(LLADDR(ifp->if_sadl), 595 (caddr_t)eh->ether_dhost, 6); 596 sa.sa_family = AF_UNSPEC; 597 sa.sa_len = sizeof(sa); 598 eh2 = (struct ether_header *)sa.sa_data; 599 for (i = 0; i < 6; i++) { 600 eh2->ether_shost[i] = c = 601 eh->ether_dhost[i]; 602 eh2->ether_dhost[i] = 603 eh->ether_dhost[i] = 604 eh->ether_shost[i]; 605 eh->ether_shost[i] = c; 606 } 607 ifp->if_output(ifp, m, &sa, NULL); 608 return; 609 } 610 default: 611 m_freem(m); 612 return; 613 } 614 break; 615 #endif /* ISO */ 616 #ifdef LLC 617 case LLC_X25_LSAP: 618 { 619 if (m->m_pkthdr.len > etype) 620 m_adj(m, etype - m->m_pkthdr.len); 621 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 622 if (m == 0) 623 return; 624 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 625 eh->ether_dhost, LLC_X25_LSAP, 6, 626 mtod(m, struct sdl_hdr *))) 627 panic("ETHER cons addr failure"); 628 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 629 #ifdef LLC_DEBUG 630 printf("llc packet\n"); 631 #endif /* LLC_DEBUG */ 632 schednetisr(NETISR_CCITT); 633 inq = &llcintrq; 634 break; 635 } 636 #endif /* LLC */ 637 dropanyway: 638 default: 639 m_freem(m); 640 return; 641 } 642 #else /* ISO || LLC || NETATALK*/ 643 m_freem(m); 644 return; 645 #endif /* ISO || LLC || NETATALK*/ 646 } 647 648 s = splimp(); 649 if (IF_QFULL(inq)) { 650 IF_DROP(inq); 651 m_freem(m); 652 } else 653 IF_ENQUEUE(inq, m); 654 splx(s); 655 } 656 657 /* 658 * Convert Ethernet address to printable (loggable) representation. 659 */ 660 static char digits[] = "0123456789abcdef"; 661 char * 662 ether_sprintf(ap) 663 u_char *ap; 664 { 665 static char etherbuf[18]; 666 char *cp = etherbuf; 667 int i; 668 669 for (i = 0; i < 6; i++) { 670 *cp++ = digits[*ap >> 4]; 671 *cp++ = digits[*ap++ & 0xf]; 672 *cp++ = ':'; 673 } 674 *--cp = 0; 675 return (etherbuf); 676 } 677 678 /* 679 * Perform common duties while attaching to interface list 680 */ 681 void 682 ether_ifattach(ifp, lla) 683 struct ifnet *ifp; 684 u_int8_t * lla; 685 { 686 struct sockaddr_dl *sdl; 687 688 ifp->if_type = IFT_ETHER; 689 ifp->if_addrlen = 6; 690 ifp->if_hdrlen = 14; 691 ifp->if_mtu = ETHERMTU; 692 ifp->if_output = ether_output; 693 if ((sdl = ifp->if_sadl) && 694 sdl->sdl_family == AF_LINK) { 695 sdl->sdl_type = IFT_ETHER; 696 sdl->sdl_alen = ifp->if_addrlen; 697 bcopy((caddr_t)lla, LLADDR(sdl), ifp->if_addrlen); 698 } 699 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 700 ifp->if_broadcastaddr = etherbroadcastaddr; 701 } 702 703 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 704 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 705 /* 706 * Add an Ethernet multicast address or range of addresses to the list for a 707 * given interface. 708 */ 709 int 710 ether_addmulti(ifr, ec) 711 struct ifreq *ifr; 712 struct ethercom *ec; 713 { 714 struct ether_multi *enm; 715 #ifdef INET 716 struct sockaddr_in *sin; 717 #endif /* INET */ 718 u_char addrlo[6]; 719 u_char addrhi[6]; 720 int s = splimp(); 721 722 switch (ifr->ifr_addr.sa_family) { 723 724 case AF_UNSPEC: 725 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 726 bcopy(addrlo, addrhi, 6); 727 break; 728 729 #ifdef INET 730 case AF_INET: 731 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 732 if (sin->sin_addr.s_addr == INADDR_ANY) { 733 /* 734 * An IP address of INADDR_ANY means listen to all 735 * of the Ethernet multicast addresses used for IP. 736 * (This is for the sake of IP multicast routers.) 737 */ 738 bcopy(ether_ipmulticast_min, addrlo, 6); 739 bcopy(ether_ipmulticast_max, addrhi, 6); 740 } 741 else { 742 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 743 bcopy(addrlo, addrhi, 6); 744 } 745 break; 746 #endif 747 748 default: 749 splx(s); 750 return (EAFNOSUPPORT); 751 } 752 753 /* 754 * Verify that we have valid Ethernet multicast addresses. 755 */ 756 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 757 splx(s); 758 return (EINVAL); 759 } 760 /* 761 * See if the address range is already in the list. 762 */ 763 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 764 if (enm != NULL) { 765 /* 766 * Found it; just increment the reference count. 767 */ 768 ++enm->enm_refcount; 769 splx(s); 770 return (0); 771 } 772 /* 773 * New address or range; malloc a new multicast record 774 * and link it into the interface's multicast list. 775 */ 776 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 777 if (enm == NULL) { 778 splx(s); 779 return (ENOBUFS); 780 } 781 bcopy(addrlo, enm->enm_addrlo, 6); 782 bcopy(addrhi, enm->enm_addrhi, 6); 783 enm->enm_ec = ec; 784 enm->enm_refcount = 1; 785 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 786 ec->ec_multicnt++; 787 splx(s); 788 /* 789 * Return ENETRESET to inform the driver that the list has changed 790 * and its reception filter should be adjusted accordingly. 791 */ 792 return (ENETRESET); 793 } 794 795 /* 796 * Delete a multicast address record. 797 */ 798 int 799 ether_delmulti(ifr, ec) 800 struct ifreq *ifr; 801 struct ethercom *ec; 802 { 803 struct ether_multi *enm; 804 #ifdef INET 805 struct sockaddr_in *sin; 806 #endif /* INET */ 807 u_char addrlo[6]; 808 u_char addrhi[6]; 809 int s = splimp(); 810 811 switch (ifr->ifr_addr.sa_family) { 812 813 case AF_UNSPEC: 814 bcopy(ifr->ifr_addr.sa_data, addrlo, 6); 815 bcopy(addrlo, addrhi, 6); 816 break; 817 818 #ifdef INET 819 case AF_INET: 820 sin = (struct sockaddr_in *)&(ifr->ifr_addr); 821 if (sin->sin_addr.s_addr == INADDR_ANY) { 822 /* 823 * An IP address of INADDR_ANY means stop listening 824 * to the range of Ethernet multicast addresses used 825 * for IP. 826 */ 827 bcopy(ether_ipmulticast_min, addrlo, 6); 828 bcopy(ether_ipmulticast_max, addrhi, 6); 829 } 830 else { 831 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 832 bcopy(addrlo, addrhi, 6); 833 } 834 break; 835 #endif 836 837 default: 838 splx(s); 839 return (EAFNOSUPPORT); 840 } 841 842 /* 843 * Look up the address in our list. 844 */ 845 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 846 if (enm == NULL) { 847 splx(s); 848 return (ENXIO); 849 } 850 if (--enm->enm_refcount != 0) { 851 /* 852 * Still some claims to this record. 853 */ 854 splx(s); 855 return (0); 856 } 857 /* 858 * No remaining claims to this record; unlink and free it. 859 */ 860 LIST_REMOVE(enm, enm_list); 861 free(enm, M_IFMADDR); 862 ec->ec_multicnt--; 863 splx(s); 864 /* 865 * Return ENETRESET to inform the driver that the list has changed 866 * and its reception filter should be adjusted accordingly. 867 */ 868 return (ENETRESET); 869 } 870
Indexes created Wed Sep 24 05:09:52 GMT 2025