if_ethersubr.c revision 1.50.2.2
1 /* $NetBSD: if_ethersubr.c,v 1.50.2.2 2000/11/22 16:05:50 bouyer Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 65 */ 66 67 #include "opt_inet.h" 68 #include "opt_atalk.h" 69 #include "opt_ccitt.h" 70 #include "opt_llc.h" 71 #include "opt_iso.h" 72 #include "opt_ns.h" 73 #include "opt_gateway.h" 74 #include "vlan.h" 75 #include "bpfilter.h" 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/kernel.h> 80 #include <sys/malloc.h> 81 #include <sys/mbuf.h> 82 #include <sys/protosw.h> 83 #include <sys/socket.h> 84 #include <sys/ioctl.h> 85 #include <sys/errno.h> 86 #include <sys/syslog.h> 87 88 #include <machine/cpu.h> 89 90 #include <net/if.h> 91 #include <net/netisr.h> 92 #include <net/route.h> 93 #include <net/if_llc.h> 94 #include <net/if_dl.h> 95 #include <net/if_types.h> 96 97 #if NBPFILTER > 0 98 #include <net/bpf.h> 99 #endif 100 101 #include <net/if_ether.h> 102 #if NVLAN > 0 103 #include <net/if_vlanvar.h> 104 #endif 105 106 #include <netinet/in.h> 107 #ifdef INET 108 #include <netinet/in_var.h> 109 #endif 110 #include <netinet/if_inarp.h> 111 112 #ifdef INET6 113 #ifndef INET 114 #include <netinet/in.h> 115 #endif 116 #include <netinet6/in6_var.h> 117 #include <netinet6/nd6.h> 118 #endif 119 120 #ifdef NS 121 #include <netns/ns.h> 122 #include <netns/ns_if.h> 123 #endif 124 125 #ifdef IPX 126 #include <netipx/ipx.h> 127 #include <netipx/ipx_if.h> 128 #endif 129 130 #ifdef ISO 131 #include <netiso/argo_debug.h> 132 #include <netiso/iso.h> 133 #include <netiso/iso_var.h> 134 #include <netiso/iso_snpac.h> 135 #endif 136 137 #ifdef LLC 138 #include <netccitt/dll.h> 139 #include <netccitt/llc_var.h> 140 #endif 141 142 #if defined(LLC) && defined(CCITT) 143 extern struct ifqueue pkintrq; 144 #endif 145 146 #ifdef NETATALK 147 #include <netatalk/at.h> 148 #include <netatalk/at_var.h> 149 #include <netatalk/at_extern.h> 150 151 #define llc_snap_org_code llc_un.type_snap.org_code 152 #define llc_snap_ether_type llc_un.type_snap.ether_type 153 154 extern u_char at_org_code[3]; 155 extern u_char aarp_org_code[3]; 156 #endif /* NETATALK */ 157 158 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 159 #define senderr(e) { error = (e); goto bad;} 160 161 #define SIN(x) ((struct sockaddr_in *)x) 162 163 static int ether_output __P((struct ifnet *, struct mbuf *, 164 struct sockaddr *, struct rtentry *)); 165 static void ether_input __P((struct ifnet *, struct mbuf *)); 166 167 /* 168 * Ethernet output routine. 169 * Encapsulate a packet of type family for the local net. 170 * Assumes that ifp is actually pointer to ethercom structure. 171 */ 172 static int 173 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 174 struct rtentry *rt0) 175 { 176 u_int16_t etype = 0; 177 int s, error = 0, hdrcmplt = 0; 178 u_char esrc[6], edst[6]; 179 struct mbuf *m = m0; 180 struct rtentry *rt; 181 struct mbuf *mcopy = (struct mbuf *)0; 182 struct ether_header *eh; 183 #ifdef INET 184 struct arphdr *ah; 185 #endif /* INET */ 186 #ifdef NETATALK 187 struct at_ifaddr *aa; 188 #endif /* NETATALK */ 189 190 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 191 senderr(ENETDOWN); 192 ifp->if_lastchange = time; 193 if ((rt = rt0) != NULL) { 194 if ((rt->rt_flags & RTF_UP) == 0) { 195 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 196 rt->rt_refcnt--; 197 if (rt->rt_ifp != ifp) 198 return (*rt->rt_ifp->if_output) 199 (ifp, m0, dst, rt); 200 } else 201 senderr(EHOSTUNREACH); 202 } 203 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 204 if (rt->rt_gwroute == 0) 205 goto lookup; 206 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 207 rtfree(rt); rt = rt0; 208 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 209 if ((rt = rt->rt_gwroute) == 0) 210 senderr(EHOSTUNREACH); 211 /* the "G" test below also prevents rt == rt0 */ 212 if ((rt->rt_flags & RTF_GATEWAY) || 213 (rt->rt_ifp != ifp)) { 214 rt->rt_refcnt--; 215 rt0->rt_gwroute = 0; 216 senderr(EHOSTUNREACH); 217 } 218 } 219 } 220 if (rt->rt_flags & RTF_REJECT) 221 if (rt->rt_rmx.rmx_expire == 0 || 222 time.tv_sec < rt->rt_rmx.rmx_expire) 223 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 224 } 225 switch (dst->sa_family) { 226 227 #ifdef INET 228 case AF_INET: 229 if (m->m_flags & M_BCAST) 230 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 231 sizeof(edst)); 232 233 else if (m->m_flags & M_MCAST) { 234 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 235 (caddr_t)edst) 236 237 } else if (!arpresolve(ifp, rt, m, dst, edst)) 238 return (0); /* if not yet resolved */ 239 /* If broadcasting on a simplex interface, loopback a copy */ 240 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 241 mcopy = m_copy(m, 0, (int)M_COPYALL); 242 etype = htons(ETHERTYPE_IP); 243 break; 244 245 case AF_ARP: 246 ah = mtod(m, struct arphdr *); 247 if (m->m_flags & M_BCAST) 248 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 249 sizeof(edst)); 250 else 251 bcopy((caddr_t)ar_tha(ah), 252 (caddr_t)edst, sizeof(edst)); 253 254 ah->ar_hrd = htons(ARPHRD_ETHER); 255 256 switch(ntohs(ah->ar_op)) { 257 case ARPOP_REVREQUEST: 258 case ARPOP_REVREPLY: 259 etype = htons(ETHERTYPE_REVARP); 260 break; 261 262 case ARPOP_REQUEST: 263 case ARPOP_REPLY: 264 default: 265 etype = htons(ETHERTYPE_ARP); 266 } 267 268 break; 269 #endif 270 #ifdef INET6 271 case AF_INET6: 272 #ifdef OLDIP6OUTPUT 273 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst)) 274 return(0); /* if not yet resolves */ 275 #else 276 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 277 /* something bad happened */ 278 return(0); 279 } 280 #endif /* OLDIP6OUTPUT */ 281 etype = htons(ETHERTYPE_IPV6); 282 break; 283 #endif 284 #ifdef NETATALK 285 case AF_APPLETALK: 286 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 287 #ifdef NETATALKDEBUG 288 printf("aarpresolv failed\n"); 289 #endif /* NETATALKDEBUG */ 290 return (0); 291 } 292 /* 293 * ifaddr is the first thing in at_ifaddr 294 */ 295 aa = (struct at_ifaddr *) at_ifawithnet( 296 (struct sockaddr_at *)dst, ifp); 297 if (aa == NULL) 298 goto bad; 299 300 /* 301 * In the phase 2 case, we need to prepend an mbuf for the 302 * llc header. Since we must preserve the value of m, 303 * which is passed to us by value, we m_copy() the first 304 * mbuf, and use it for our llc header. 305 */ 306 if (aa->aa_flags & AFA_PHASE2) { 307 struct llc llc; 308 309 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 310 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 311 llc.llc_control = LLC_UI; 312 bcopy(at_org_code, llc.llc_snap_org_code, 313 sizeof(llc.llc_snap_org_code)); 314 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 315 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 316 } else { 317 etype = htons(ETHERTYPE_ATALK); 318 } 319 break; 320 #endif /* NETATALK */ 321 #ifdef NS 322 case AF_NS: 323 etype = htons(ETHERTYPE_NS); 324 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 325 (caddr_t)edst, sizeof (edst)); 326 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 327 return (looutput(ifp, m, dst, rt)); 328 /* If broadcasting on a simplex interface, loopback a copy */ 329 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 330 mcopy = m_copy(m, 0, (int)M_COPYALL); 331 break; 332 #endif 333 #ifdef IPX 334 case AF_IPX: 335 etype = htons(ETHERTYPE_IPX); 336 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 337 (caddr_t)edst, sizeof (edst)); 338 /* If broadcasting on a simplex interface, loopback a copy */ 339 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 340 mcopy = m_copy(m, 0, (int)M_COPYALL); 341 break; 342 #endif 343 #ifdef ISO 344 case AF_ISO: { 345 int snpalen; 346 struct llc *l; 347 struct sockaddr_dl *sdl; 348 349 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 350 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 351 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 352 } else { 353 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 354 (char *)edst, &snpalen); 355 if (error) 356 goto bad; /* Not Resolved */ 357 } 358 /* If broadcasting on a simplex interface, loopback a copy */ 359 if (*edst & 1) 360 m->m_flags |= (M_BCAST|M_MCAST); 361 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 362 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 363 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 364 if (mcopy) { 365 eh = mtod(mcopy, struct ether_header *); 366 bcopy((caddr_t)edst, 367 (caddr_t)eh->ether_dhost, sizeof (edst)); 368 bcopy(LLADDR(ifp->if_sadl), 369 (caddr_t)eh->ether_shost, sizeof (edst)); 370 } 371 } 372 M_PREPEND(m, 3, M_DONTWAIT); 373 if (m == NULL) 374 return (0); 375 l = mtod(m, struct llc *); 376 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 377 l->llc_control = LLC_UI; 378 #ifdef ARGO_DEBUG 379 if (argo_debug[D_ETHER]) { 380 int i; 381 printf("unoutput: sending pkt to: "); 382 for (i=0; i<6; i++) 383 printf("%x ", edst[i] & 0xff); 384 printf("\n"); 385 } 386 #endif 387 } break; 388 #endif /* ISO */ 389 #ifdef LLC 390 /* case AF_NSAP: */ 391 case AF_CCITT: { 392 struct sockaddr_dl *sdl = 393 (struct sockaddr_dl *) rt -> rt_gateway; 394 395 if (sdl && sdl->sdl_family == AF_LINK 396 && sdl->sdl_alen > 0) { 397 bcopy(LLADDR(sdl), (char *)edst, 398 sizeof(edst)); 399 } else goto bad; /* Not a link interface ? Funny ... */ 400 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 401 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 402 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 403 if (mcopy) { 404 eh = mtod(mcopy, struct ether_header *); 405 bcopy((caddr_t)edst, 406 (caddr_t)eh->ether_dhost, sizeof (edst)); 407 bcopy(LLADDR(ifp->if_sadl), 408 (caddr_t)eh->ether_shost, sizeof (edst)); 409 } 410 } 411 #ifdef LLC_DEBUG 412 { 413 int i; 414 struct llc *l = mtod(m, struct llc *); 415 416 printf("ether_output: sending LLC2 pkt to: "); 417 for (i=0; i<6; i++) 418 printf("%x ", edst[i] & 0xff); 419 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 420 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 421 l->llc_control & 0xff); 422 423 } 424 #endif /* LLC_DEBUG */ 425 } break; 426 #endif /* LLC */ 427 428 case pseudo_AF_HDRCMPLT: 429 hdrcmplt = 1; 430 eh = (struct ether_header *)dst->sa_data; 431 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 432 /* FALLTHROUGH */ 433 434 case AF_UNSPEC: 435 eh = (struct ether_header *)dst->sa_data; 436 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 437 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 438 etype = eh->ether_type; 439 break; 440 441 default: 442 printf("%s: can't handle af%d\n", ifp->if_xname, 443 dst->sa_family); 444 senderr(EAFNOSUPPORT); 445 } 446 447 if (mcopy) 448 (void) looutput(ifp, mcopy, dst, rt); 449 450 /* If no ether type is set, this must be a 802.2 formatted packet. 451 */ 452 if (etype == 0) 453 etype = htons(m->m_pkthdr.len); 454 /* 455 * Add local net header. If no space in first mbuf, 456 * allocate another. 457 */ 458 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 459 if (m == 0) 460 senderr(ENOBUFS); 461 eh = mtod(m, struct ether_header *); 462 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 463 sizeof(eh->ether_type)); 464 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 465 if (hdrcmplt) 466 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 467 sizeof(eh->ether_shost)); 468 else 469 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 470 sizeof(eh->ether_shost)); 471 s = splimp(); 472 /* 473 * Queue message on interface, and start output if interface 474 * not yet active. 475 */ 476 if (IF_QFULL(&ifp->if_snd)) { 477 IF_DROP(&ifp->if_snd); 478 splx(s); 479 senderr(ENOBUFS); 480 } 481 ifp->if_obytes += m->m_pkthdr.len; 482 if (m->m_flags & M_MCAST) 483 ifp->if_omcasts++; 484 IF_ENQUEUE(&ifp->if_snd, m); 485 if ((ifp->if_flags & IFF_OACTIVE) == 0) 486 (*ifp->if_start)(ifp); 487 splx(s); 488 return (error); 489 490 bad: 491 if (m) 492 m_freem(m); 493 return (error); 494 } 495 496 /* 497 * Process a received Ethernet packet; 498 * the packet is in the mbuf chain m with 499 * the ether header. 500 */ 501 static void 502 ether_input(struct ifnet *ifp, struct mbuf *m) 503 { 504 struct ifqueue *inq; 505 u_int16_t etype; 506 int s; 507 struct ether_header *eh; 508 struct mbuf *n; 509 #if defined (ISO) || defined (LLC) || defined(NETATALK) 510 struct llc *l; 511 #endif 512 513 if ((ifp->if_flags & IFF_UP) == 0) { 514 m_freem(m); 515 return; 516 } 517 518 eh = mtod(m, struct ether_header *); 519 etype = ntohs(eh->ether_type); 520 521 /* 522 * Determine if the packet is within its size limits. 523 */ 524 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 525 printf("%s: discarding oversize frame (len=%d)\n", 526 ifp->if_xname, m->m_pkthdr.len); 527 m_freem(m); 528 return; 529 } 530 531 ifp->if_lastchange = time; 532 ifp->if_ibytes += m->m_pkthdr.len; 533 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 534 if (memcmp(etherbroadcastaddr, 535 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 536 m->m_flags |= M_BCAST; 537 else 538 m->m_flags |= M_MCAST; 539 ifp->if_imcasts++; 540 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 541 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 542 ETHER_ADDR_LEN) != 0) { 543 m_freem(m); 544 return; 545 } 546 547 /* Check if the mbuf has a VLAN tag */ 548 n = m_aux_find(m, AF_LINK, ETHERTYPE_VLAN); 549 if (n) { 550 #if NVLAN > 0 551 /* 552 * vlan_input() will either recursively call ether_input() 553 * or drop the packet. 554 */ 555 if (((struct ethercom *)ifp)->ec_nvlans != 0) 556 vlan_input(ifp, m); 557 else 558 #endif 559 m_freem(m); 560 return; 561 } 562 563 /* 564 * Handle protocols that expect to have the Ethernet header 565 * (and possibly FCS) intact. 566 */ 567 switch (etype) { 568 #if NVLAN > 0 569 case ETHERTYPE_VLAN: 570 /* 571 * vlan_input() will either recursively call ether_input() 572 * or drop the packet. 573 */ 574 if (((struct ethercom *)ifp)->ec_nvlans != 0) 575 vlan_input(ifp, m); 576 else 577 m_freem(m); 578 return; 579 #endif /* NVLAN > 0 */ 580 default: 581 /* Nothing. */ 582 } 583 584 /* Strip off the Ethernet header. */ 585 m_adj(m, sizeof(struct ether_header)); 586 587 /* If the CRC is still on the packet, trim it off. */ 588 if (m->m_flags & M_HASFCS) 589 m_adj(m, -ETHER_CRC_LEN); 590 591 switch (etype) { 592 #ifdef INET 593 case ETHERTYPE_IP: 594 #ifdef GATEWAY 595 if (ipflow_fastforward(m)) 596 return; 597 #endif 598 schednetisr(NETISR_IP); 599 inq = &ipintrq; 600 break; 601 602 case ETHERTYPE_ARP: 603 schednetisr(NETISR_ARP); 604 inq = &arpintrq; 605 break; 606 607 case ETHERTYPE_REVARP: 608 revarpinput(m); /* XXX queue? */ 609 return; 610 #endif 611 #ifdef INET6 612 case ETHERTYPE_IPV6: 613 schednetisr(NETISR_IPV6); 614 inq = &ip6intrq; 615 break; 616 #endif 617 #ifdef NS 618 case ETHERTYPE_NS: 619 schednetisr(NETISR_NS); 620 inq = &nsintrq; 621 break; 622 623 #endif 624 #ifdef IPX 625 case ETHERTYPE_IPX: 626 schednetisr(NETISR_IPX); 627 inq = &ipxintrq; 628 break; 629 #endif 630 #ifdef NETATALK 631 case ETHERTYPE_ATALK: 632 schednetisr(NETISR_ATALK); 633 inq = &atintrq1; 634 break; 635 case ETHERTYPE_AARP: 636 /* probably this should be done with a NETISR as well */ 637 aarpinput(ifp, m); /* XXX */ 638 return; 639 #endif /* NETATALK */ 640 default: 641 #if defined (ISO) || defined (LLC) || defined (NETATALK) 642 if (etype > ETHERMTU) 643 goto dropanyway; 644 l = mtod(m, struct llc *); 645 switch (l->llc_dsap) { 646 #ifdef NETATALK 647 case LLC_SNAP_LSAP: 648 switch (l->llc_control) { 649 case LLC_UI: 650 if (l->llc_ssap != LLC_SNAP_LSAP) { 651 goto dropanyway; 652 } 653 654 if (Bcmp(&(l->llc_snap_org_code)[0], 655 at_org_code, sizeof(at_org_code)) == 0 && 656 ntohs(l->llc_snap_ether_type) == 657 ETHERTYPE_ATALK) { 658 inq = &atintrq2; 659 m_adj(m, sizeof(struct llc)); 660 schednetisr(NETISR_ATALK); 661 break; 662 } 663 664 if (Bcmp(&(l->llc_snap_org_code)[0], 665 aarp_org_code, 666 sizeof(aarp_org_code)) == 0 && 667 ntohs(l->llc_snap_ether_type) == 668 ETHERTYPE_AARP) { 669 m_adj( m, sizeof(struct llc)); 670 aarpinput(ifp, m); /* XXX */ 671 return; 672 } 673 674 default: 675 goto dropanyway; 676 } 677 break; 678 #endif /* NETATALK */ 679 #ifdef ISO 680 case LLC_ISO_LSAP: 681 switch (l->llc_control) { 682 case LLC_UI: 683 /* LLC_UI_P forbidden in class 1 service */ 684 if ((l->llc_dsap == LLC_ISO_LSAP) && 685 (l->llc_ssap == LLC_ISO_LSAP)) { 686 /* LSAP for ISO */ 687 if (m->m_pkthdr.len > etype) 688 m_adj(m, etype - m->m_pkthdr.len); 689 m->m_data += 3; /* XXX */ 690 m->m_len -= 3; /* XXX */ 691 m->m_pkthdr.len -= 3; /* XXX */ 692 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 693 if (m == 0) 694 return; 695 *mtod(m, struct ether_header *) = *eh; 696 #ifdef ARGO_DEBUG 697 if (argo_debug[D_ETHER]) 698 printf("clnp packet"); 699 #endif 700 schednetisr(NETISR_ISO); 701 inq = &clnlintrq; 702 break; 703 } 704 goto dropanyway; 705 706 case LLC_XID: 707 case LLC_XID_P: 708 if(m->m_len < 6) 709 goto dropanyway; 710 l->llc_window = 0; 711 l->llc_fid = 9; 712 l->llc_class = 1; 713 l->llc_dsap = l->llc_ssap = 0; 714 /* Fall through to */ 715 case LLC_TEST: 716 case LLC_TEST_P: 717 { 718 struct sockaddr sa; 719 struct ether_header *eh2; 720 int i; 721 u_char c = l->llc_dsap; 722 723 l->llc_dsap = l->llc_ssap; 724 l->llc_ssap = c; 725 if (m->m_flags & (M_BCAST | M_MCAST)) 726 bcopy(LLADDR(ifp->if_sadl), 727 (caddr_t)eh->ether_dhost, 6); 728 sa.sa_family = AF_UNSPEC; 729 sa.sa_len = sizeof(sa); 730 eh2 = (struct ether_header *)sa.sa_data; 731 for (i = 0; i < 6; i++) { 732 eh2->ether_shost[i] = c = 733 eh->ether_dhost[i]; 734 eh2->ether_dhost[i] = 735 eh->ether_dhost[i] = 736 eh->ether_shost[i]; 737 eh->ether_shost[i] = c; 738 } 739 ifp->if_output(ifp, m, &sa, NULL); 740 return; 741 } 742 default: 743 m_freem(m); 744 return; 745 } 746 break; 747 #endif /* ISO */ 748 #ifdef LLC 749 case LLC_X25_LSAP: 750 { 751 if (m->m_pkthdr.len > etype) 752 m_adj(m, etype - m->m_pkthdr.len); 753 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 754 if (m == 0) 755 return; 756 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 757 eh->ether_dhost, LLC_X25_LSAP, 6, 758 mtod(m, struct sdl_hdr *))) 759 panic("ETHER cons addr failure"); 760 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 761 #ifdef LLC_DEBUG 762 printf("llc packet\n"); 763 #endif /* LLC_DEBUG */ 764 schednetisr(NETISR_CCITT); 765 inq = &llcintrq; 766 break; 767 } 768 #endif /* LLC */ 769 dropanyway: 770 default: 771 m_freem(m); 772 return; 773 } 774 #else /* ISO || LLC || NETATALK*/ 775 m_freem(m); 776 return; 777 #endif /* ISO || LLC || NETATALK*/ 778 } 779 780 s = splimp(); 781 if (IF_QFULL(inq)) { 782 IF_DROP(inq); 783 m_freem(m); 784 } else 785 IF_ENQUEUE(inq, m); 786 splx(s); 787 } 788 789 /* 790 * Convert Ethernet address to printable (loggable) representation. 791 */ 792 static char digits[] = "0123456789abcdef"; 793 char * 794 ether_sprintf(const u_char *ap) 795 { 796 static char etherbuf[18]; 797 char *cp = etherbuf; 798 int i; 799 800 for (i = 0; i < 6; i++) { 801 *cp++ = digits[*ap >> 4]; 802 *cp++ = digits[*ap++ & 0xf]; 803 *cp++ = ':'; 804 } 805 *--cp = 0; 806 return (etherbuf); 807 } 808 809 /* 810 * Perform common duties while attaching to interface list 811 */ 812 void 813 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 814 { 815 struct sockaddr_dl *sdl; 816 817 ifp->if_type = IFT_ETHER; 818 ifp->if_addrlen = 6; 819 ifp->if_hdrlen = 14; 820 ifp->if_mtu = ETHERMTU; 821 ifp->if_output = ether_output; 822 ifp->if_input = ether_input; 823 if (ifp->if_baudrate == 0) 824 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 825 if ((sdl = ifp->if_sadl) && 826 sdl->sdl_family == AF_LINK) { 827 sdl->sdl_type = IFT_ETHER; 828 sdl->sdl_alen = ifp->if_addrlen; 829 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 830 } 831 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 832 ifp->if_broadcastaddr = etherbroadcastaddr; 833 #if NBPFILTER > 0 834 bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); 835 #endif 836 } 837 838 void 839 ether_ifdetach(struct ifnet *ifp) 840 { 841 struct ethercom *ec = (void *) ifp; 842 struct sockaddr_dl *sdl = ifp->if_sadl; 843 struct ether_multi *enm; 844 int s; 845 846 #if NBPFILTER > 0 847 bpfdetach(ifp); 848 #endif 849 850 #if NVLAN > 0 851 if (ec->ec_nvlans) 852 vlan_ifdetach(ifp); 853 #endif 854 855 s = splimp(); 856 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 857 LIST_REMOVE(enm, enm_list); 858 free(enm, M_IFADDR); 859 ec->ec_multicnt--; 860 } 861 splx(s); 862 863 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 864 sdl->sdl_alen = 0; 865 sdl->sdl_type = 0; 866 } 867 868 #if 0 869 /* 870 * This is for reference. We have a table-driven version 871 * of the little-endian crc32 generator, which is faster 872 * than the double-loop. 873 */ 874 u_int32_t 875 ether_crc32_le(const u_int8_t *buf, size_t len) 876 { 877 u_int32_t c, crc, carry; 878 size_t i, j; 879 880 crc = 0xffffffffU; /* initial value */ 881 882 for (i = 0; i < len; i++) { 883 c = buf[i]; 884 for (j = 0; j < 8; j++) { 885 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 886 crc >>= 1; 887 c >>= 1; 888 if (carry) 889 crc = (crc ^ ETHER_CRC_POLY_LE); 890 } 891 } 892 893 return (crc); 894 } 895 #else 896 u_int32_t 897 ether_crc32_le(const u_int8_t *buf, size_t len) 898 { 899 static const u_int32_t crctab[] = { 900 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 901 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 902 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 903 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 904 }; 905 u_int32_t crc; 906 int i; 907 908 crc = 0xffffffffU; /* initial value */ 909 910 for (i = 0; i < len; i++) { 911 crc ^= buf[i]; 912 crc = (crc >> 4) ^ crctab[crc & 0xf]; 913 crc = (crc >> 4) ^ crctab[crc & 0xf]; 914 } 915 916 return (crc); 917 } 918 #endif 919 920 u_int32_t 921 ether_crc32_be(const u_int8_t *buf, size_t len) 922 { 923 u_int32_t c, crc, carry; 924 size_t i, j; 925 926 crc = 0xffffffffU; /* initial value */ 927 928 for (i = 0; i < len; i++) { 929 c = buf[i]; 930 for (j = 0; j < 8; j++) { 931 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 932 crc <<= 1; 933 c >>= 1; 934 if (carry) 935 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 936 } 937 } 938 939 return (crc); 940 } 941 942 #ifdef INET 943 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 944 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 945 #endif 946 #ifdef INET6 947 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 948 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 949 #endif 950 951 /* 952 * Convert a sockaddr into an Ethernet address or range of Ethernet 953 * addresses. 954 */ 955 int 956 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 957 u_int8_t addrhi[ETHER_ADDR_LEN]) 958 { 959 #ifdef INET 960 struct sockaddr_in *sin; 961 #endif /* INET */ 962 #ifdef INET6 963 struct sockaddr_in6 *sin6; 964 #endif /* INET6 */ 965 966 switch (sa->sa_family) { 967 968 case AF_UNSPEC: 969 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 970 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 971 break; 972 973 #ifdef INET 974 case AF_INET: 975 sin = satosin(sa); 976 if (sin->sin_addr.s_addr == INADDR_ANY) { 977 /* 978 * An IP address of INADDR_ANY means listen to 979 * or stop listening to all of the Ethernet 980 * multicast addresses used for IP. 981 * (This is for the sake of IP multicast routers.) 982 */ 983 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 984 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 985 } 986 else { 987 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 988 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 989 } 990 break; 991 #endif 992 #ifdef INET6 993 case AF_INET6: 994 sin6 = satosin6(sa); 995 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 996 /* 997 * An IP6 address of 0 means listen to or stop 998 * listening to all of the Ethernet multicast 999 * address used for IP6. 1000 * (This is used for multicast routers.) 1001 */ 1002 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1003 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1004 } else { 1005 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1006 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1007 } 1008 break; 1009 #endif 1010 1011 default: 1012 return (EAFNOSUPPORT); 1013 } 1014 return (0); 1015 } 1016 1017 /* 1018 * Add an Ethernet multicast address or range of addresses to the list for a 1019 * given interface. 1020 */ 1021 int 1022 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1023 { 1024 struct ether_multi *enm; 1025 u_char addrlo[ETHER_ADDR_LEN]; 1026 u_char addrhi[ETHER_ADDR_LEN]; 1027 int s = splimp(), error; 1028 1029 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1030 if (error != 0) { 1031 splx(s); 1032 return (error); 1033 } 1034 1035 /* 1036 * Verify that we have valid Ethernet multicast addresses. 1037 */ 1038 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1039 splx(s); 1040 return (EINVAL); 1041 } 1042 /* 1043 * See if the address range is already in the list. 1044 */ 1045 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1046 if (enm != NULL) { 1047 /* 1048 * Found it; just increment the reference count. 1049 */ 1050 ++enm->enm_refcount; 1051 splx(s); 1052 return (0); 1053 } 1054 /* 1055 * New address or range; malloc a new multicast record 1056 * and link it into the interface's multicast list. 1057 */ 1058 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1059 if (enm == NULL) { 1060 splx(s); 1061 return (ENOBUFS); 1062 } 1063 bcopy(addrlo, enm->enm_addrlo, 6); 1064 bcopy(addrhi, enm->enm_addrhi, 6); 1065 enm->enm_ec = ec; 1066 enm->enm_refcount = 1; 1067 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1068 ec->ec_multicnt++; 1069 splx(s); 1070 /* 1071 * Return ENETRESET to inform the driver that the list has changed 1072 * and its reception filter should be adjusted accordingly. 1073 */ 1074 return (ENETRESET); 1075 } 1076 1077 /* 1078 * Delete a multicast address record. 1079 */ 1080 int 1081 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1082 { 1083 struct ether_multi *enm; 1084 u_char addrlo[ETHER_ADDR_LEN]; 1085 u_char addrhi[ETHER_ADDR_LEN]; 1086 int s = splimp(), error; 1087 1088 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1089 if (error != 0) { 1090 splx(s); 1091 return (error); 1092 } 1093 1094 /* 1095 * Look ur the address in our list. 1096 */ 1097 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1098 if (enm == NULL) { 1099 splx(s); 1100 return (ENXIO); 1101 } 1102 if (--enm->enm_refcount != 0) { 1103 /* 1104 * Still some claims to this record. 1105 */ 1106 splx(s); 1107 return (0); 1108 } 1109 /* 1110 * No remaining claims to this record; unlink and free it. 1111 */ 1112 LIST_REMOVE(enm, enm_list); 1113 free(enm, M_IFMADDR); 1114 ec->ec_multicnt--; 1115 splx(s); 1116 /* 1117 * Return ENETRESET to inform the driver that the list has changed 1118 * and its reception filter should be adjusted accordingly. 1119 */ 1120 return (ENETRESET); 1121 } 1122 1123 /* 1124 * Common ioctls for Ethernet interfaces. Note, we must be 1125 * called at splnet(). 1126 */ 1127 int 1128 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1129 { 1130 struct ethercom *ec = (void *) ifp; 1131 struct ifreq *ifr = (struct ifreq *)data; 1132 struct ifaddr *ifa = (struct ifaddr *)data; 1133 int error = 0; 1134 1135 switch (cmd) { 1136 case SIOCSIFADDR: 1137 ifp->if_flags |= IFF_UP; 1138 switch (ifa->ifa_addr->sa_family) { 1139 #ifdef INET 1140 case AF_INET: 1141 if ((error = (*ifp->if_init)(ifp)) != 0) 1142 break; 1143 arp_ifinit(ifp, ifa); 1144 break; 1145 #endif /* INET */ 1146 #ifdef NS 1147 case AF_NS: 1148 { 1149 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1150 1151 if (ns_nullhost(*ina)) 1152 ina->x_host = *(union ns_host *) 1153 LLADDR(ifp->if_sadl); 1154 else 1155 memcpy(LLADDR(ifp->if_sadl), 1156 ina->x_host.c_host, ifp->if_addrlen); 1157 /* Set new address. */ 1158 error = (*ifp->if_init)(ifp); 1159 break; 1160 } 1161 #endif /* NS */ 1162 default: 1163 error = (*ifp->if_init)(ifp); 1164 break; 1165 } 1166 break; 1167 1168 case SIOCGIFADDR: 1169 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1170 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1171 break; 1172 1173 case SIOCSIFMTU: 1174 if (ifr->ifr_mtu > ETHERMTU) 1175 error = EINVAL; 1176 else 1177 ifp->if_mtu = ifr->ifr_mtu; 1178 break; 1179 1180 case SIOCSIFFLAGS: 1181 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1182 /* 1183 * If interface is marked down and it is running, 1184 * then stop and disable it. 1185 */ 1186 (*ifp->if_stop)(ifp, 1); 1187 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1188 /* 1189 * If interface is marked up and it is stopped, then 1190 * start it. 1191 */ 1192 error = (*ifp->if_init)(ifp); 1193 } else if ((ifp->if_flags & IFF_UP) != 0) { 1194 /* 1195 * Reset the interface to pick up changes in any other 1196 * flags that affect the hardware state. 1197 */ 1198 error = (*ifp->if_init)(ifp); 1199 } 1200 break; 1201 1202 case SIOCADDMULTI: 1203 case SIOCDELMULTI: 1204 error = (cmd == SIOCADDMULTI) ? 1205 ether_addmulti(ifr, ec) : 1206 ether_delmulti(ifr, ec); 1207 break; 1208 1209 default: 1210 error = ENOTTY; 1211 } 1212 1213 return (error); 1214 } 1215
Indexes created Tue Sep 30 10:09:55 GMT 2025