if_ethersubr.c revision 1.69
1 /* $NetBSD: if_ethersubr.c,v 1.69 2000/11/15 01:02:15 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, 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 #if defined (ISO) || defined (LLC) || defined(NETATALK) 509 struct llc *l; 510 #endif 511 512 if ((ifp->if_flags & IFF_UP) == 0) { 513 m_freem(m); 514 return; 515 } 516 517 eh = mtod(m, struct ether_header *); 518 etype = ntohs(eh->ether_type); 519 520 /* 521 * Determine if the packet is within its size limits. 522 */ 523 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 524 printf("%s: discarding oversize frame (len=%d)\n", 525 ifp->if_xname, m->m_pkthdr.len); 526 m_freem(m); 527 return; 528 } 529 530 ifp->if_lastchange = time; 531 ifp->if_ibytes += m->m_pkthdr.len; 532 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 533 if (memcmp(etherbroadcastaddr, 534 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 535 m->m_flags |= M_BCAST; 536 else 537 m->m_flags |= M_MCAST; 538 ifp->if_imcasts++; 539 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 540 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 541 ETHER_ADDR_LEN) != 0) { 542 m_freem(m); 543 return; 544 } 545 546 /* 547 * Handle protocols that expect to have the Ethernet header 548 * (and possibly FCS) intact. 549 */ 550 switch (etype) { 551 #if NVLAN > 0 552 case ETHERTYPE_VLAN: 553 /* 554 * vlan_input() will either recursively call ether_input() 555 * or drop the packet. 556 */ 557 if (((struct ethercom *)ifp)->ec_nvlans != 0) 558 vlan_input(ifp, m); 559 else 560 m_freem(m); 561 return; 562 #endif /* NVLAN > 0 */ 563 default: 564 /* Nothing. */ 565 } 566 567 /* Strip off the Ethernet header. */ 568 m_adj(m, sizeof(struct ether_header)); 569 570 /* If the CRC is still on the packet, trim it off. */ 571 if (m->m_flags & M_HASFCS) 572 m_adj(m, -ETHER_CRC_LEN); 573 574 switch (etype) { 575 #ifdef INET 576 case ETHERTYPE_IP: 577 #ifdef GATEWAY 578 if (ipflow_fastforward(m)) 579 return; 580 #endif 581 schednetisr(NETISR_IP); 582 inq = &ipintrq; 583 break; 584 585 case ETHERTYPE_ARP: 586 schednetisr(NETISR_ARP); 587 inq = &arpintrq; 588 break; 589 590 case ETHERTYPE_REVARP: 591 revarpinput(m); /* XXX queue? */ 592 return; 593 #endif 594 #ifdef INET6 595 case ETHERTYPE_IPV6: 596 schednetisr(NETISR_IPV6); 597 inq = &ip6intrq; 598 break; 599 #endif 600 #ifdef NS 601 case ETHERTYPE_NS: 602 schednetisr(NETISR_NS); 603 inq = &nsintrq; 604 break; 605 606 #endif 607 #ifdef IPX 608 case ETHERTYPE_IPX: 609 schednetisr(NETISR_IPX); 610 inq = &ipxintrq; 611 break; 612 #endif 613 #ifdef NETATALK 614 case ETHERTYPE_ATALK: 615 schednetisr(NETISR_ATALK); 616 inq = &atintrq1; 617 break; 618 case ETHERTYPE_AARP: 619 /* probably this should be done with a NETISR as well */ 620 aarpinput(ifp, m); /* XXX */ 621 return; 622 #endif /* NETATALK */ 623 default: 624 #if defined (ISO) || defined (LLC) || defined (NETATALK) 625 if (etype > ETHERMTU) 626 goto dropanyway; 627 l = mtod(m, struct llc *); 628 switch (l->llc_dsap) { 629 #ifdef NETATALK 630 case LLC_SNAP_LSAP: 631 switch (l->llc_control) { 632 case LLC_UI: 633 if (l->llc_ssap != LLC_SNAP_LSAP) { 634 goto dropanyway; 635 } 636 637 if (Bcmp(&(l->llc_snap_org_code)[0], 638 at_org_code, sizeof(at_org_code)) == 0 && 639 ntohs(l->llc_snap_ether_type) == 640 ETHERTYPE_ATALK) { 641 inq = &atintrq2; 642 m_adj(m, sizeof(struct llc)); 643 schednetisr(NETISR_ATALK); 644 break; 645 } 646 647 if (Bcmp(&(l->llc_snap_org_code)[0], 648 aarp_org_code, 649 sizeof(aarp_org_code)) == 0 && 650 ntohs(l->llc_snap_ether_type) == 651 ETHERTYPE_AARP) { 652 m_adj( m, sizeof(struct llc)); 653 aarpinput(ifp, m); /* XXX */ 654 return; 655 } 656 657 default: 658 goto dropanyway; 659 } 660 break; 661 #endif /* NETATALK */ 662 #ifdef ISO 663 case LLC_ISO_LSAP: 664 switch (l->llc_control) { 665 case LLC_UI: 666 /* LLC_UI_P forbidden in class 1 service */ 667 if ((l->llc_dsap == LLC_ISO_LSAP) && 668 (l->llc_ssap == LLC_ISO_LSAP)) { 669 /* LSAP for ISO */ 670 if (m->m_pkthdr.len > etype) 671 m_adj(m, etype - m->m_pkthdr.len); 672 m->m_data += 3; /* XXX */ 673 m->m_len -= 3; /* XXX */ 674 m->m_pkthdr.len -= 3; /* XXX */ 675 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 676 if (m == 0) 677 return; 678 *mtod(m, struct ether_header *) = *eh; 679 #ifdef ARGO_DEBUG 680 if (argo_debug[D_ETHER]) 681 printf("clnp packet"); 682 #endif 683 schednetisr(NETISR_ISO); 684 inq = &clnlintrq; 685 break; 686 } 687 goto dropanyway; 688 689 case LLC_XID: 690 case LLC_XID_P: 691 if(m->m_len < 6) 692 goto dropanyway; 693 l->llc_window = 0; 694 l->llc_fid = 9; 695 l->llc_class = 1; 696 l->llc_dsap = l->llc_ssap = 0; 697 /* Fall through to */ 698 case LLC_TEST: 699 case LLC_TEST_P: 700 { 701 struct sockaddr sa; 702 struct ether_header *eh2; 703 int i; 704 u_char c = l->llc_dsap; 705 706 l->llc_dsap = l->llc_ssap; 707 l->llc_ssap = c; 708 if (m->m_flags & (M_BCAST | M_MCAST)) 709 bcopy(LLADDR(ifp->if_sadl), 710 (caddr_t)eh->ether_dhost, 6); 711 sa.sa_family = AF_UNSPEC; 712 sa.sa_len = sizeof(sa); 713 eh2 = (struct ether_header *)sa.sa_data; 714 for (i = 0; i < 6; i++) { 715 eh2->ether_shost[i] = c = 716 eh->ether_dhost[i]; 717 eh2->ether_dhost[i] = 718 eh->ether_dhost[i] = 719 eh->ether_shost[i]; 720 eh->ether_shost[i] = c; 721 } 722 ifp->if_output(ifp, m, &sa, NULL); 723 return; 724 } 725 default: 726 m_freem(m); 727 return; 728 } 729 break; 730 #endif /* ISO */ 731 #ifdef LLC 732 case LLC_X25_LSAP: 733 { 734 if (m->m_pkthdr.len > etype) 735 m_adj(m, etype - m->m_pkthdr.len); 736 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 737 if (m == 0) 738 return; 739 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 740 eh->ether_dhost, LLC_X25_LSAP, 6, 741 mtod(m, struct sdl_hdr *))) 742 panic("ETHER cons addr failure"); 743 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 744 #ifdef LLC_DEBUG 745 printf("llc packet\n"); 746 #endif /* LLC_DEBUG */ 747 schednetisr(NETISR_CCITT); 748 inq = &llcintrq; 749 break; 750 } 751 #endif /* LLC */ 752 dropanyway: 753 default: 754 m_freem(m); 755 return; 756 } 757 #else /* ISO || LLC || NETATALK*/ 758 m_freem(m); 759 return; 760 #endif /* ISO || LLC || NETATALK*/ 761 } 762 763 s = splimp(); 764 if (IF_QFULL(inq)) { 765 IF_DROP(inq); 766 m_freem(m); 767 } else 768 IF_ENQUEUE(inq, m); 769 splx(s); 770 } 771 772 /* 773 * Convert Ethernet address to printable (loggable) representation. 774 */ 775 static char digits[] = "0123456789abcdef"; 776 char * 777 ether_sprintf(const u_char *ap) 778 { 779 static char etherbuf[18]; 780 char *cp = etherbuf; 781 int i; 782 783 for (i = 0; i < 6; i++) { 784 *cp++ = digits[*ap >> 4]; 785 *cp++ = digits[*ap++ & 0xf]; 786 *cp++ = ':'; 787 } 788 *--cp = 0; 789 return (etherbuf); 790 } 791 792 /* 793 * Perform common duties while attaching to interface list 794 */ 795 void 796 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 797 { 798 struct sockaddr_dl *sdl; 799 800 ifp->if_type = IFT_ETHER; 801 ifp->if_addrlen = 6; 802 ifp->if_hdrlen = 14; 803 ifp->if_mtu = ETHERMTU; 804 ifp->if_output = ether_output; 805 ifp->if_input = ether_input; 806 if (ifp->if_baudrate == 0) 807 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 808 if ((sdl = ifp->if_sadl) && 809 sdl->sdl_family == AF_LINK) { 810 sdl->sdl_type = IFT_ETHER; 811 sdl->sdl_alen = ifp->if_addrlen; 812 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 813 } 814 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 815 ifp->if_broadcastaddr = etherbroadcastaddr; 816 #if NBPFILTER > 0 817 bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header)); 818 #endif 819 } 820 821 void 822 ether_ifdetach(struct ifnet *ifp) 823 { 824 struct ethercom *ec = (void *) ifp; 825 struct sockaddr_dl *sdl = ifp->if_sadl; 826 struct ether_multi *enm; 827 int s; 828 829 #if NBPFILTER > 0 830 bpfdetach(ifp); 831 #endif 832 833 #if NVLAN > 0 834 if (ec->ec_nvlans) 835 vlan_ifdetach(ifp); 836 #endif 837 838 s = splimp(); 839 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 840 LIST_REMOVE(enm, enm_list); 841 free(enm, M_IFADDR); 842 ec->ec_multicnt--; 843 } 844 splx(s); 845 846 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 847 sdl->sdl_alen = 0; 848 sdl->sdl_type = 0; 849 } 850 851 #if 0 852 /* 853 * This is for reference. We have a table-driven version 854 * of the little-endian crc32 generator, which is faster 855 * than the double-loop. 856 */ 857 u_int32_t 858 ether_crc32_le(const u_int8_t *buf, size_t len) 859 { 860 u_int32_t c, crc, carry; 861 size_t i, j; 862 863 crc = 0xffffffffU; /* initial value */ 864 865 for (i = 0; i < len; i++) { 866 c = buf[i]; 867 for (j = 0; j < 8; j++) { 868 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 869 crc >>= 1; 870 c >>= 1; 871 if (carry) 872 crc = (crc ^ ETHER_CRC_POLY_LE); 873 } 874 } 875 876 return (crc); 877 } 878 #else 879 u_int32_t 880 ether_crc32_le(const u_int8_t *buf, size_t len) 881 { 882 static const u_int32_t crctab[] = { 883 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 884 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 885 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 886 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 887 }; 888 u_int32_t crc; 889 int i; 890 891 crc = 0xffffffffU; /* initial value */ 892 893 for (i = 0; i < len; i++) { 894 crc ^= buf[i]; 895 crc = (crc >> 4) ^ crctab[crc & 0xf]; 896 crc = (crc >> 4) ^ crctab[crc & 0xf]; 897 } 898 899 return (crc); 900 } 901 #endif 902 903 u_int32_t 904 ether_crc32_be(const u_int8_t *buf, size_t len) 905 { 906 u_int32_t c, crc, carry; 907 size_t i, j; 908 909 crc = 0xffffffffU; /* initial value */ 910 911 for (i = 0; i < len; i++) { 912 c = buf[i]; 913 for (j = 0; j < 8; j++) { 914 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 915 crc <<= 1; 916 c >>= 1; 917 if (carry) 918 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 919 } 920 } 921 922 return (crc); 923 } 924 925 #ifdef INET 926 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 927 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 928 #endif 929 #ifdef INET6 930 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 931 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 932 #endif 933 934 /* 935 * Convert a sockaddr into an Ethernet address or range of Ethernet 936 * addresses. 937 */ 938 int 939 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 940 u_int8_t addrhi[ETHER_ADDR_LEN]) 941 { 942 #ifdef INET 943 struct sockaddr_in *sin; 944 #endif /* INET */ 945 #ifdef INET6 946 struct sockaddr_in6 *sin6; 947 #endif /* INET6 */ 948 949 switch (sa->sa_family) { 950 951 case AF_UNSPEC: 952 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 953 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 954 break; 955 956 #ifdef INET 957 case AF_INET: 958 sin = satosin(sa); 959 if (sin->sin_addr.s_addr == INADDR_ANY) { 960 /* 961 * An IP address of INADDR_ANY means listen to 962 * or stop listening to all of the Ethernet 963 * multicast addresses used for IP. 964 * (This is for the sake of IP multicast routers.) 965 */ 966 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 967 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 968 } 969 else { 970 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 971 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 972 } 973 break; 974 #endif 975 #ifdef INET6 976 case AF_INET6: 977 sin6 = satosin6(sa); 978 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 979 /* 980 * An IP6 address of 0 means listen to or stop 981 * listening to all of the Ethernet multicast 982 * address used for IP6. 983 * (This is used for multicast routers.) 984 */ 985 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 986 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 987 } else { 988 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 989 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 990 } 991 break; 992 #endif 993 994 default: 995 return (EAFNOSUPPORT); 996 } 997 return (0); 998 } 999 1000 /* 1001 * Add an Ethernet multicast address or range of addresses to the list for a 1002 * given interface. 1003 */ 1004 int 1005 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1006 { 1007 struct ether_multi *enm; 1008 u_char addrlo[ETHER_ADDR_LEN]; 1009 u_char addrhi[ETHER_ADDR_LEN]; 1010 int s = splimp(), error; 1011 1012 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1013 if (error != 0) { 1014 splx(s); 1015 return (error); 1016 } 1017 1018 /* 1019 * Verify that we have valid Ethernet multicast addresses. 1020 */ 1021 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1022 splx(s); 1023 return (EINVAL); 1024 } 1025 /* 1026 * See if the address range is already in the list. 1027 */ 1028 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1029 if (enm != NULL) { 1030 /* 1031 * Found it; just increment the reference count. 1032 */ 1033 ++enm->enm_refcount; 1034 splx(s); 1035 return (0); 1036 } 1037 /* 1038 * New address or range; malloc a new multicast record 1039 * and link it into the interface's multicast list. 1040 */ 1041 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1042 if (enm == NULL) { 1043 splx(s); 1044 return (ENOBUFS); 1045 } 1046 bcopy(addrlo, enm->enm_addrlo, 6); 1047 bcopy(addrhi, enm->enm_addrhi, 6); 1048 enm->enm_ec = ec; 1049 enm->enm_refcount = 1; 1050 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1051 ec->ec_multicnt++; 1052 splx(s); 1053 /* 1054 * Return ENETRESET to inform the driver that the list has changed 1055 * and its reception filter should be adjusted accordingly. 1056 */ 1057 return (ENETRESET); 1058 } 1059 1060 /* 1061 * Delete a multicast address record. 1062 */ 1063 int 1064 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1065 { 1066 struct ether_multi *enm; 1067 u_char addrlo[ETHER_ADDR_LEN]; 1068 u_char addrhi[ETHER_ADDR_LEN]; 1069 int s = splimp(), error; 1070 1071 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1072 if (error != 0) { 1073 splx(s); 1074 return (error); 1075 } 1076 1077 /* 1078 * Look ur the address in our list. 1079 */ 1080 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1081 if (enm == NULL) { 1082 splx(s); 1083 return (ENXIO); 1084 } 1085 if (--enm->enm_refcount != 0) { 1086 /* 1087 * Still some claims to this record. 1088 */ 1089 splx(s); 1090 return (0); 1091 } 1092 /* 1093 * No remaining claims to this record; unlink and free it. 1094 */ 1095 LIST_REMOVE(enm, enm_list); 1096 free(enm, M_IFMADDR); 1097 ec->ec_multicnt--; 1098 splx(s); 1099 /* 1100 * Return ENETRESET to inform the driver that the list has changed 1101 * and its reception filter should be adjusted accordingly. 1102 */ 1103 return (ENETRESET); 1104 } 1105 1106 /* 1107 * Common ioctls for Ethernet interfaces. Note, we must be 1108 * called at splnet(). 1109 */ 1110 int 1111 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1112 { 1113 struct ethercom *ec = (void *) ifp; 1114 struct ifreq *ifr = (struct ifreq *)data; 1115 struct ifaddr *ifa = (struct ifaddr *)data; 1116 int error = 0; 1117 1118 switch (cmd) { 1119 case SIOCSIFADDR: 1120 ifp->if_flags |= IFF_UP; 1121 switch (ifa->ifa_addr->sa_family) { 1122 #ifdef INET 1123 case AF_INET: 1124 if ((error = (*ifp->if_init)(ifp)) != 0) 1125 break; 1126 arp_ifinit(ifp, ifa); 1127 break; 1128 #endif /* INET */ 1129 #ifdef NS 1130 case AF_NS: 1131 { 1132 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1133 1134 if (ns_nullhost(*ina)) 1135 ina->x_host = *(union ns_host *) 1136 LLADDR(ifp->if_sadl); 1137 else 1138 memcpy(LLADDR(ifp->if_sadl), 1139 ina->x_host.c_host, ifp->if_addrlen); 1140 /* Set new address. */ 1141 error = (*ifp->if_init)(ifp); 1142 break; 1143 } 1144 #endif /* NS */ 1145 default: 1146 error = (*ifp->if_init)(ifp); 1147 break; 1148 } 1149 break; 1150 1151 case SIOCGIFADDR: 1152 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1153 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1154 break; 1155 1156 case SIOCSIFMTU: 1157 if (ifr->ifr_mtu > ETHERMTU) 1158 error = EINVAL; 1159 else 1160 ifp->if_mtu = ifr->ifr_mtu; 1161 break; 1162 1163 case SIOCSIFFLAGS: 1164 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1165 /* 1166 * If interface is marked down and it is running, 1167 * then stop and disable it. 1168 */ 1169 (*ifp->if_stop)(ifp, 1); 1170 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1171 /* 1172 * If interface is marked up and it is stopped, then 1173 * start it. 1174 */ 1175 error = (*ifp->if_init)(ifp); 1176 } else if ((ifp->if_flags & IFF_UP) != 0) { 1177 /* 1178 * Reset the interface to pick up changes in any other 1179 * flags that affect the hardware state. 1180 */ 1181 error = (*ifp->if_init)(ifp); 1182 } 1183 break; 1184 1185 case SIOCADDMULTI: 1186 case SIOCDELMULTI: 1187 error = (cmd == SIOCADDMULTI) ? 1188 ether_addmulti(ifr, ec) : 1189 ether_delmulti(ifr, ec); 1190 break; 1191 1192 default: 1193 error = ENOTTY; 1194 } 1195 1196 return (error); 1197 } 1198
Indexes created Mon Sep 22 21:09:42 GMT 2025