if_ethersubr.c revision 1.72
1 /* $NetBSD: if_ethersubr.c,v 1.72 2000/12/13 22:07:50 thorpej 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, len, 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 ALTQ_DECL(struct altq_pktattr pktattr;) 184 #ifdef INET 185 struct arphdr *ah; 186 #endif /* INET */ 187 #ifdef NETATALK 188 struct at_ifaddr *aa; 189 #endif /* NETATALK */ 190 short mflags; 191 192 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 193 senderr(ENETDOWN); 194 ifp->if_lastchange = time; 195 if ((rt = rt0) != NULL) { 196 if ((rt->rt_flags & RTF_UP) == 0) { 197 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 198 rt->rt_refcnt--; 199 if (rt->rt_ifp != ifp) 200 return (*rt->rt_ifp->if_output) 201 (ifp, m0, dst, rt); 202 } else 203 senderr(EHOSTUNREACH); 204 } 205 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 206 if (rt->rt_gwroute == 0) 207 goto lookup; 208 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 209 rtfree(rt); rt = rt0; 210 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 211 if ((rt = rt->rt_gwroute) == 0) 212 senderr(EHOSTUNREACH); 213 /* the "G" test below also prevents rt == rt0 */ 214 if ((rt->rt_flags & RTF_GATEWAY) || 215 (rt->rt_ifp != ifp)) { 216 rt->rt_refcnt--; 217 rt0->rt_gwroute = 0; 218 senderr(EHOSTUNREACH); 219 } 220 } 221 } 222 if (rt->rt_flags & RTF_REJECT) 223 if (rt->rt_rmx.rmx_expire == 0 || 224 time.tv_sec < rt->rt_rmx.rmx_expire) 225 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 226 } 227 228 /* 229 * If the queueing discipline needs packet classification, 230 * do it before prepending link headers. 231 */ 232 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 233 234 switch (dst->sa_family) { 235 236 #ifdef INET 237 case AF_INET: 238 if (m->m_flags & M_BCAST) 239 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 240 sizeof(edst)); 241 242 else if (m->m_flags & M_MCAST) { 243 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 244 (caddr_t)edst) 245 246 } else if (!arpresolve(ifp, rt, m, dst, edst)) 247 return (0); /* if not yet resolved */ 248 /* If broadcasting on a simplex interface, loopback a copy */ 249 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 250 mcopy = m_copy(m, 0, (int)M_COPYALL); 251 etype = htons(ETHERTYPE_IP); 252 break; 253 254 case AF_ARP: 255 ah = mtod(m, struct arphdr *); 256 if (m->m_flags & M_BCAST) 257 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 258 sizeof(edst)); 259 else 260 bcopy((caddr_t)ar_tha(ah), 261 (caddr_t)edst, sizeof(edst)); 262 263 ah->ar_hrd = htons(ARPHRD_ETHER); 264 265 switch(ntohs(ah->ar_op)) { 266 case ARPOP_REVREQUEST: 267 case ARPOP_REVREPLY: 268 etype = htons(ETHERTYPE_REVARP); 269 break; 270 271 case ARPOP_REQUEST: 272 case ARPOP_REPLY: 273 default: 274 etype = htons(ETHERTYPE_ARP); 275 } 276 277 break; 278 #endif 279 #ifdef INET6 280 case AF_INET6: 281 #ifdef OLDIP6OUTPUT 282 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst)) 283 return(0); /* if not yet resolves */ 284 #else 285 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 286 /* something bad happened */ 287 return(0); 288 } 289 #endif /* OLDIP6OUTPUT */ 290 etype = htons(ETHERTYPE_IPV6); 291 break; 292 #endif 293 #ifdef NETATALK 294 case AF_APPLETALK: 295 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 296 #ifdef NETATALKDEBUG 297 printf("aarpresolv failed\n"); 298 #endif /* NETATALKDEBUG */ 299 return (0); 300 } 301 /* 302 * ifaddr is the first thing in at_ifaddr 303 */ 304 aa = (struct at_ifaddr *) at_ifawithnet( 305 (struct sockaddr_at *)dst, ifp); 306 if (aa == NULL) 307 goto bad; 308 309 /* 310 * In the phase 2 case, we need to prepend an mbuf for the 311 * llc header. Since we must preserve the value of m, 312 * which is passed to us by value, we m_copy() the first 313 * mbuf, and use it for our llc header. 314 */ 315 if (aa->aa_flags & AFA_PHASE2) { 316 struct llc llc; 317 318 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 319 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 320 llc.llc_control = LLC_UI; 321 bcopy(at_org_code, llc.llc_snap_org_code, 322 sizeof(llc.llc_snap_org_code)); 323 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 324 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 325 } else { 326 etype = htons(ETHERTYPE_ATALK); 327 } 328 break; 329 #endif /* NETATALK */ 330 #ifdef NS 331 case AF_NS: 332 etype = htons(ETHERTYPE_NS); 333 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 334 (caddr_t)edst, sizeof (edst)); 335 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 336 return (looutput(ifp, m, dst, rt)); 337 /* If broadcasting on a simplex interface, loopback a copy */ 338 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 339 mcopy = m_copy(m, 0, (int)M_COPYALL); 340 break; 341 #endif 342 #ifdef IPX 343 case AF_IPX: 344 etype = htons(ETHERTYPE_IPX); 345 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 346 (caddr_t)edst, sizeof (edst)); 347 /* If broadcasting on a simplex interface, loopback a copy */ 348 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 349 mcopy = m_copy(m, 0, (int)M_COPYALL); 350 break; 351 #endif 352 #ifdef ISO 353 case AF_ISO: { 354 int snpalen; 355 struct llc *l; 356 struct sockaddr_dl *sdl; 357 358 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 359 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 360 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 361 } else { 362 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 363 (char *)edst, &snpalen); 364 if (error) 365 goto bad; /* Not Resolved */ 366 } 367 /* If broadcasting on a simplex interface, loopback a copy */ 368 if (*edst & 1) 369 m->m_flags |= (M_BCAST|M_MCAST); 370 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 371 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 372 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 373 if (mcopy) { 374 eh = mtod(mcopy, struct ether_header *); 375 bcopy((caddr_t)edst, 376 (caddr_t)eh->ether_dhost, sizeof (edst)); 377 bcopy(LLADDR(ifp->if_sadl), 378 (caddr_t)eh->ether_shost, sizeof (edst)); 379 } 380 } 381 M_PREPEND(m, 3, M_DONTWAIT); 382 if (m == NULL) 383 return (0); 384 l = mtod(m, struct llc *); 385 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 386 l->llc_control = LLC_UI; 387 #ifdef ARGO_DEBUG 388 if (argo_debug[D_ETHER]) { 389 int i; 390 printf("unoutput: sending pkt to: "); 391 for (i=0; i<6; i++) 392 printf("%x ", edst[i] & 0xff); 393 printf("\n"); 394 } 395 #endif 396 } break; 397 #endif /* ISO */ 398 #ifdef LLC 399 /* case AF_NSAP: */ 400 case AF_CCITT: { 401 struct sockaddr_dl *sdl = 402 (struct sockaddr_dl *) rt -> rt_gateway; 403 404 if (sdl && sdl->sdl_family == AF_LINK 405 && sdl->sdl_alen > 0) { 406 bcopy(LLADDR(sdl), (char *)edst, 407 sizeof(edst)); 408 } else goto bad; /* Not a link interface ? Funny ... */ 409 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 410 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 411 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 412 if (mcopy) { 413 eh = mtod(mcopy, struct ether_header *); 414 bcopy((caddr_t)edst, 415 (caddr_t)eh->ether_dhost, sizeof (edst)); 416 bcopy(LLADDR(ifp->if_sadl), 417 (caddr_t)eh->ether_shost, sizeof (edst)); 418 } 419 } 420 #ifdef LLC_DEBUG 421 { 422 int i; 423 struct llc *l = mtod(m, struct llc *); 424 425 printf("ether_output: sending LLC2 pkt to: "); 426 for (i=0; i<6; i++) 427 printf("%x ", edst[i] & 0xff); 428 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 429 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 430 l->llc_control & 0xff); 431 432 } 433 #endif /* LLC_DEBUG */ 434 } break; 435 #endif /* LLC */ 436 437 case pseudo_AF_HDRCMPLT: 438 hdrcmplt = 1; 439 eh = (struct ether_header *)dst->sa_data; 440 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 441 /* FALLTHROUGH */ 442 443 case AF_UNSPEC: 444 eh = (struct ether_header *)dst->sa_data; 445 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 446 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 447 etype = eh->ether_type; 448 break; 449 450 default: 451 printf("%s: can't handle af%d\n", ifp->if_xname, 452 dst->sa_family); 453 senderr(EAFNOSUPPORT); 454 } 455 456 if (mcopy) 457 (void) looutput(ifp, mcopy, dst, rt); 458 459 /* If no ether type is set, this must be a 802.2 formatted packet. 460 */ 461 if (etype == 0) 462 etype = htons(m->m_pkthdr.len); 463 /* 464 * Add local net header. If no space in first mbuf, 465 * allocate another. 466 */ 467 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 468 if (m == 0) 469 senderr(ENOBUFS); 470 eh = mtod(m, struct ether_header *); 471 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 472 sizeof(eh->ether_type)); 473 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 474 if (hdrcmplt) 475 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 476 sizeof(eh->ether_shost)); 477 else 478 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 479 sizeof(eh->ether_shost)); 480 mflags = m->m_flags; 481 len = m->m_pkthdr.len; 482 s = splimp(); 483 /* 484 * Queue message on interface, and start output if interface 485 * not yet active. 486 */ 487 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 488 if (error) { 489 /* mbuf is already freed */ 490 splx(s); 491 return (error); 492 } 493 ifp->if_obytes += len; 494 if (mflags & M_MCAST) 495 ifp->if_omcasts++; 496 if ((ifp->if_flags & IFF_OACTIVE) == 0) 497 (*ifp->if_start)(ifp); 498 splx(s); 499 return (error); 500 501 bad: 502 if (m) 503 m_freem(m); 504 return (error); 505 } 506 507 /* 508 * Process a received Ethernet packet; 509 * the packet is in the mbuf chain m with 510 * the ether header. 511 */ 512 static void 513 ether_input(struct ifnet *ifp, struct mbuf *m) 514 { 515 struct ifqueue *inq; 516 u_int16_t etype; 517 int s; 518 struct ether_header *eh; 519 struct mbuf *n; 520 #if defined (ISO) || defined (LLC) || defined(NETATALK) 521 struct llc *l; 522 #endif 523 524 if ((ifp->if_flags & IFF_UP) == 0) { 525 m_freem(m); 526 return; 527 } 528 529 eh = mtod(m, struct ether_header *); 530 etype = ntohs(eh->ether_type); 531 532 /* 533 * Determine if the packet is within its size limits. 534 */ 535 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 536 printf("%s: discarding oversize frame (len=%d)\n", 537 ifp->if_xname, m->m_pkthdr.len); 538 m_freem(m); 539 return; 540 } 541 542 ifp->if_lastchange = time; 543 ifp->if_ibytes += m->m_pkthdr.len; 544 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 545 if (memcmp(etherbroadcastaddr, 546 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 547 m->m_flags |= M_BCAST; 548 else 549 m->m_flags |= M_MCAST; 550 ifp->if_imcasts++; 551 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 552 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 553 ETHER_ADDR_LEN) != 0) { 554 m_freem(m); 555 return; 556 } 557 558 /* Check if the mbuf has a VLAN tag */ 559 n = m_aux_find(m, AF_LINK, ETHERTYPE_VLAN); 560 if (n) { 561 #if NVLAN > 0 562 /* 563 * vlan_input() will either recursively call ether_input() 564 * or drop the packet. 565 */ 566 if (((struct ethercom *)ifp)->ec_nvlans != 0) 567 vlan_input(ifp, m); 568 else 569 #endif 570 m_freem(m); 571 return; 572 } 573 574 /* 575 * Handle protocols that expect to have the Ethernet header 576 * (and possibly FCS) intact. 577 */ 578 switch (etype) { 579 #if NVLAN > 0 580 case ETHERTYPE_VLAN: 581 /* 582 * vlan_input() will either recursively call ether_input() 583 * or drop the packet. 584 */ 585 if (((struct ethercom *)ifp)->ec_nvlans != 0) 586 vlan_input(ifp, m); 587 else 588 m_freem(m); 589 return; 590 #endif /* NVLAN > 0 */ 591 default: 592 /* Nothing. */ 593 } 594 595 /* Strip off the Ethernet header. */ 596 m_adj(m, sizeof(struct ether_header)); 597 598 /* If the CRC is still on the packet, trim it off. */ 599 if (m->m_flags & M_HASFCS) 600 m_adj(m, -ETHER_CRC_LEN); 601 602 switch (etype) { 603 #ifdef INET 604 case ETHERTYPE_IP: 605 #ifdef GATEWAY 606 if (ipflow_fastforward(m)) 607 return; 608 #endif 609 schednetisr(NETISR_IP); 610 inq = &ipintrq; 611 break; 612 613 case ETHERTYPE_ARP: 614 schednetisr(NETISR_ARP); 615 inq = &arpintrq; 616 break; 617 618 case ETHERTYPE_REVARP: 619 revarpinput(m); /* XXX queue? */ 620 return; 621 #endif 622 #ifdef INET6 623 case ETHERTYPE_IPV6: 624 schednetisr(NETISR_IPV6); 625 inq = &ip6intrq; 626 break; 627 #endif 628 #ifdef NS 629 case ETHERTYPE_NS: 630 schednetisr(NETISR_NS); 631 inq = &nsintrq; 632 break; 633 634 #endif 635 #ifdef IPX 636 case ETHERTYPE_IPX: 637 schednetisr(NETISR_IPX); 638 inq = &ipxintrq; 639 break; 640 #endif 641 #ifdef NETATALK 642 case ETHERTYPE_ATALK: 643 schednetisr(NETISR_ATALK); 644 inq = &atintrq1; 645 break; 646 case ETHERTYPE_AARP: 647 /* probably this should be done with a NETISR as well */ 648 aarpinput(ifp, m); /* XXX */ 649 return; 650 #endif /* NETATALK */ 651 default: 652 #if defined (ISO) || defined (LLC) || defined (NETATALK) 653 if (etype > ETHERMTU) 654 goto dropanyway; 655 l = mtod(m, struct llc *); 656 switch (l->llc_dsap) { 657 #ifdef NETATALK 658 case LLC_SNAP_LSAP: 659 switch (l->llc_control) { 660 case LLC_UI: 661 if (l->llc_ssap != LLC_SNAP_LSAP) { 662 goto dropanyway; 663 } 664 665 if (Bcmp(&(l->llc_snap_org_code)[0], 666 at_org_code, sizeof(at_org_code)) == 0 && 667 ntohs(l->llc_snap_ether_type) == 668 ETHERTYPE_ATALK) { 669 inq = &atintrq2; 670 m_adj(m, sizeof(struct llc)); 671 schednetisr(NETISR_ATALK); 672 break; 673 } 674 675 if (Bcmp(&(l->llc_snap_org_code)[0], 676 aarp_org_code, 677 sizeof(aarp_org_code)) == 0 && 678 ntohs(l->llc_snap_ether_type) == 679 ETHERTYPE_AARP) { 680 m_adj( m, sizeof(struct llc)); 681 aarpinput(ifp, m); /* XXX */ 682 return; 683 } 684 685 default: 686 goto dropanyway; 687 } 688 break; 689 #endif /* NETATALK */ 690 #ifdef ISO 691 case LLC_ISO_LSAP: 692 switch (l->llc_control) { 693 case LLC_UI: 694 /* LLC_UI_P forbidden in class 1 service */ 695 if ((l->llc_dsap == LLC_ISO_LSAP) && 696 (l->llc_ssap == LLC_ISO_LSAP)) { 697 /* LSAP for ISO */ 698 if (m->m_pkthdr.len > etype) 699 m_adj(m, etype - m->m_pkthdr.len); 700 m->m_data += 3; /* XXX */ 701 m->m_len -= 3; /* XXX */ 702 m->m_pkthdr.len -= 3; /* XXX */ 703 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 704 if (m == 0) 705 return; 706 *mtod(m, struct ether_header *) = *eh; 707 #ifdef ARGO_DEBUG 708 if (argo_debug[D_ETHER]) 709 printf("clnp packet"); 710 #endif 711 schednetisr(NETISR_ISO); 712 inq = &clnlintrq; 713 break; 714 } 715 goto dropanyway; 716 717 case LLC_XID: 718 case LLC_XID_P: 719 if(m->m_len < 6) 720 goto dropanyway; 721 l->llc_window = 0; 722 l->llc_fid = 9; 723 l->llc_class = 1; 724 l->llc_dsap = l->llc_ssap = 0; 725 /* Fall through to */ 726 case LLC_TEST: 727 case LLC_TEST_P: 728 { 729 struct sockaddr sa; 730 struct ether_header *eh2; 731 int i; 732 u_char c = l->llc_dsap; 733 734 l->llc_dsap = l->llc_ssap; 735 l->llc_ssap = c; 736 if (m->m_flags & (M_BCAST | M_MCAST)) 737 bcopy(LLADDR(ifp->if_sadl), 738 (caddr_t)eh->ether_dhost, 6); 739 sa.sa_family = AF_UNSPEC; 740 sa.sa_len = sizeof(sa); 741 eh2 = (struct ether_header *)sa.sa_data; 742 for (i = 0; i < 6; i++) { 743 eh2->ether_shost[i] = c = 744 eh->ether_dhost[i]; 745 eh2->ether_dhost[i] = 746 eh->ether_dhost[i] = 747 eh->ether_shost[i]; 748 eh->ether_shost[i] = c; 749 } 750 ifp->if_output(ifp, m, &sa, NULL); 751 return; 752 } 753 default: 754 m_freem(m); 755 return; 756 } 757 break; 758 #endif /* ISO */ 759 #ifdef LLC 760 case LLC_X25_LSAP: 761 { 762 if (m->m_pkthdr.len > etype) 763 m_adj(m, etype - m->m_pkthdr.len); 764 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 765 if (m == 0) 766 return; 767 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 768 eh->ether_dhost, LLC_X25_LSAP, 6, 769 mtod(m, struct sdl_hdr *))) 770 panic("ETHER cons addr failure"); 771 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 772 #ifdef LLC_DEBUG 773 printf("llc packet\n"); 774 #endif /* LLC_DEBUG */ 775 schednetisr(NETISR_CCITT); 776 inq = &llcintrq; 777 break; 778 } 779 #endif /* LLC */ 780 dropanyway: 781 default: 782 m_freem(m); 783 return; 784 } 785 #else /* ISO || LLC || NETATALK*/ 786 m_freem(m); 787 return; 788 #endif /* ISO || LLC || NETATALK*/ 789 } 790 791 s = splimp(); 792 if (IF_QFULL(inq)) { 793 IF_DROP(inq); 794 m_freem(m); 795 } else 796 IF_ENQUEUE(inq, m); 797 splx(s); 798 } 799 800 /* 801 * Convert Ethernet address to printable (loggable) representation. 802 */ 803 static char digits[] = "0123456789abcdef"; 804 char * 805 ether_sprintf(const u_char *ap) 806 { 807 static char etherbuf[18]; 808 char *cp = etherbuf; 809 int i; 810 811 for (i = 0; i < 6; i++) { 812 *cp++ = digits[*ap >> 4]; 813 *cp++ = digits[*ap++ & 0xf]; 814 *cp++ = ':'; 815 } 816 *--cp = 0; 817 return (etherbuf); 818 } 819 820 /* 821 * Perform common duties while attaching to interface list 822 */ 823 void 824 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 825 { 826 struct sockaddr_dl *sdl; 827 828 ifp->if_type = IFT_ETHER; 829 ifp->if_addrlen = 6; 830 ifp->if_hdrlen = 14; 831 ifp->if_mtu = ETHERMTU; 832 ifp->if_output = ether_output; 833 ifp->if_input = ether_input; 834 if (ifp->if_baudrate == 0) 835 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 836 if ((sdl = ifp->if_sadl) && 837 sdl->sdl_family == AF_LINK) { 838 sdl->sdl_type = IFT_ETHER; 839 sdl->sdl_alen = ifp->if_addrlen; 840 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 841 } 842 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 843 ifp->if_broadcastaddr = etherbroadcastaddr; 844 #if NBPFILTER > 0 845 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 846 #endif 847 } 848 849 void 850 ether_ifdetach(struct ifnet *ifp) 851 { 852 struct ethercom *ec = (void *) ifp; 853 struct sockaddr_dl *sdl = ifp->if_sadl; 854 struct ether_multi *enm; 855 int s; 856 857 #if NBPFILTER > 0 858 bpfdetach(ifp); 859 #endif 860 861 #if NVLAN > 0 862 if (ec->ec_nvlans) 863 vlan_ifdetach(ifp); 864 #endif 865 866 s = splimp(); 867 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 868 LIST_REMOVE(enm, enm_list); 869 free(enm, M_IFADDR); 870 ec->ec_multicnt--; 871 } 872 splx(s); 873 874 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 875 sdl->sdl_alen = 0; 876 sdl->sdl_type = 0; 877 } 878 879 #if 0 880 /* 881 * This is for reference. We have a table-driven version 882 * of the little-endian crc32 generator, which is faster 883 * than the double-loop. 884 */ 885 u_int32_t 886 ether_crc32_le(const u_int8_t *buf, size_t len) 887 { 888 u_int32_t c, crc, carry; 889 size_t i, j; 890 891 crc = 0xffffffffU; /* initial value */ 892 893 for (i = 0; i < len; i++) { 894 c = buf[i]; 895 for (j = 0; j < 8; j++) { 896 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 897 crc >>= 1; 898 c >>= 1; 899 if (carry) 900 crc = (crc ^ ETHER_CRC_POLY_LE); 901 } 902 } 903 904 return (crc); 905 } 906 #else 907 u_int32_t 908 ether_crc32_le(const u_int8_t *buf, size_t len) 909 { 910 static const u_int32_t crctab[] = { 911 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 912 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 913 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 914 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 915 }; 916 u_int32_t crc; 917 int i; 918 919 crc = 0xffffffffU; /* initial value */ 920 921 for (i = 0; i < len; i++) { 922 crc ^= buf[i]; 923 crc = (crc >> 4) ^ crctab[crc & 0xf]; 924 crc = (crc >> 4) ^ crctab[crc & 0xf]; 925 } 926 927 return (crc); 928 } 929 #endif 930 931 u_int32_t 932 ether_crc32_be(const u_int8_t *buf, size_t len) 933 { 934 u_int32_t c, crc, carry; 935 size_t i, j; 936 937 crc = 0xffffffffU; /* initial value */ 938 939 for (i = 0; i < len; i++) { 940 c = buf[i]; 941 for (j = 0; j < 8; j++) { 942 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 943 crc <<= 1; 944 c >>= 1; 945 if (carry) 946 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 947 } 948 } 949 950 return (crc); 951 } 952 953 #ifdef INET 954 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 955 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 956 #endif 957 #ifdef INET6 958 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 959 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 960 #endif 961 962 /* 963 * Convert a sockaddr into an Ethernet address or range of Ethernet 964 * addresses. 965 */ 966 int 967 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 968 u_int8_t addrhi[ETHER_ADDR_LEN]) 969 { 970 #ifdef INET 971 struct sockaddr_in *sin; 972 #endif /* INET */ 973 #ifdef INET6 974 struct sockaddr_in6 *sin6; 975 #endif /* INET6 */ 976 977 switch (sa->sa_family) { 978 979 case AF_UNSPEC: 980 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 981 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 982 break; 983 984 #ifdef INET 985 case AF_INET: 986 sin = satosin(sa); 987 if (sin->sin_addr.s_addr == INADDR_ANY) { 988 /* 989 * An IP address of INADDR_ANY means listen to 990 * or stop listening to all of the Ethernet 991 * multicast addresses used for IP. 992 * (This is for the sake of IP multicast routers.) 993 */ 994 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 995 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 996 } 997 else { 998 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 999 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1000 } 1001 break; 1002 #endif 1003 #ifdef INET6 1004 case AF_INET6: 1005 sin6 = satosin6(sa); 1006 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1007 /* 1008 * An IP6 address of 0 means listen to or stop 1009 * listening to all of the Ethernet multicast 1010 * address used for IP6. 1011 * (This is used for multicast routers.) 1012 */ 1013 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1014 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1015 } else { 1016 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1017 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1018 } 1019 break; 1020 #endif 1021 1022 default: 1023 return (EAFNOSUPPORT); 1024 } 1025 return (0); 1026 } 1027 1028 /* 1029 * Add an Ethernet multicast address or range of addresses to the list for a 1030 * given interface. 1031 */ 1032 int 1033 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1034 { 1035 struct ether_multi *enm; 1036 u_char addrlo[ETHER_ADDR_LEN]; 1037 u_char addrhi[ETHER_ADDR_LEN]; 1038 int s = splimp(), error; 1039 1040 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1041 if (error != 0) { 1042 splx(s); 1043 return (error); 1044 } 1045 1046 /* 1047 * Verify that we have valid Ethernet multicast addresses. 1048 */ 1049 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1050 splx(s); 1051 return (EINVAL); 1052 } 1053 /* 1054 * See if the address range is already in the list. 1055 */ 1056 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1057 if (enm != NULL) { 1058 /* 1059 * Found it; just increment the reference count. 1060 */ 1061 ++enm->enm_refcount; 1062 splx(s); 1063 return (0); 1064 } 1065 /* 1066 * New address or range; malloc a new multicast record 1067 * and link it into the interface's multicast list. 1068 */ 1069 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1070 if (enm == NULL) { 1071 splx(s); 1072 return (ENOBUFS); 1073 } 1074 bcopy(addrlo, enm->enm_addrlo, 6); 1075 bcopy(addrhi, enm->enm_addrhi, 6); 1076 enm->enm_ec = ec; 1077 enm->enm_refcount = 1; 1078 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1079 ec->ec_multicnt++; 1080 splx(s); 1081 /* 1082 * Return ENETRESET to inform the driver that the list has changed 1083 * and its reception filter should be adjusted accordingly. 1084 */ 1085 return (ENETRESET); 1086 } 1087 1088 /* 1089 * Delete a multicast address record. 1090 */ 1091 int 1092 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1093 { 1094 struct ether_multi *enm; 1095 u_char addrlo[ETHER_ADDR_LEN]; 1096 u_char addrhi[ETHER_ADDR_LEN]; 1097 int s = splimp(), error; 1098 1099 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1100 if (error != 0) { 1101 splx(s); 1102 return (error); 1103 } 1104 1105 /* 1106 * Look ur the address in our list. 1107 */ 1108 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1109 if (enm == NULL) { 1110 splx(s); 1111 return (ENXIO); 1112 } 1113 if (--enm->enm_refcount != 0) { 1114 /* 1115 * Still some claims to this record. 1116 */ 1117 splx(s); 1118 return (0); 1119 } 1120 /* 1121 * No remaining claims to this record; unlink and free it. 1122 */ 1123 LIST_REMOVE(enm, enm_list); 1124 free(enm, M_IFMADDR); 1125 ec->ec_multicnt--; 1126 splx(s); 1127 /* 1128 * Return ENETRESET to inform the driver that the list has changed 1129 * and its reception filter should be adjusted accordingly. 1130 */ 1131 return (ENETRESET); 1132 } 1133 1134 /* 1135 * Common ioctls for Ethernet interfaces. Note, we must be 1136 * called at splnet(). 1137 */ 1138 int 1139 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1140 { 1141 struct ethercom *ec = (void *) ifp; 1142 struct ifreq *ifr = (struct ifreq *)data; 1143 struct ifaddr *ifa = (struct ifaddr *)data; 1144 int error = 0; 1145 1146 switch (cmd) { 1147 case SIOCSIFADDR: 1148 ifp->if_flags |= IFF_UP; 1149 switch (ifa->ifa_addr->sa_family) { 1150 #ifdef INET 1151 case AF_INET: 1152 if ((error = (*ifp->if_init)(ifp)) != 0) 1153 break; 1154 arp_ifinit(ifp, ifa); 1155 break; 1156 #endif /* INET */ 1157 #ifdef NS 1158 case AF_NS: 1159 { 1160 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1161 1162 if (ns_nullhost(*ina)) 1163 ina->x_host = *(union ns_host *) 1164 LLADDR(ifp->if_sadl); 1165 else 1166 memcpy(LLADDR(ifp->if_sadl), 1167 ina->x_host.c_host, ifp->if_addrlen); 1168 /* Set new address. */ 1169 error = (*ifp->if_init)(ifp); 1170 break; 1171 } 1172 #endif /* NS */ 1173 default: 1174 error = (*ifp->if_init)(ifp); 1175 break; 1176 } 1177 break; 1178 1179 case SIOCGIFADDR: 1180 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1181 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1182 break; 1183 1184 case SIOCSIFMTU: 1185 if (ifr->ifr_mtu > ETHERMTU) 1186 error = EINVAL; 1187 else 1188 ifp->if_mtu = ifr->ifr_mtu; 1189 break; 1190 1191 case SIOCSIFFLAGS: 1192 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1193 /* 1194 * If interface is marked down and it is running, 1195 * then stop and disable it. 1196 */ 1197 (*ifp->if_stop)(ifp, 1); 1198 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1199 /* 1200 * If interface is marked up and it is stopped, then 1201 * start it. 1202 */ 1203 error = (*ifp->if_init)(ifp); 1204 } else if ((ifp->if_flags & IFF_UP) != 0) { 1205 /* 1206 * Reset the interface to pick up changes in any other 1207 * flags that affect the hardware state. 1208 */ 1209 error = (*ifp->if_init)(ifp); 1210 } 1211 break; 1212 1213 case SIOCADDMULTI: 1214 case SIOCDELMULTI: 1215 error = (cmd == SIOCADDMULTI) ? 1216 ether_addmulti(ifr, ec) : 1217 ether_delmulti(ifr, ec); 1218 break; 1219 1220 default: 1221 error = ENOTTY; 1222 } 1223 1224 return (error); 1225 } 1226
Indexes created Mon Sep 22 13:09:51 GMT 2025