if_ethersubr.c revision 1.63
1 /* $NetBSD: if_ethersubr.c,v 1.63 2000/10/03 23:33:38 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 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/kernel.h> 79 #include <sys/malloc.h> 80 #include <sys/mbuf.h> 81 #include <sys/protosw.h> 82 #include <sys/socket.h> 83 #include <sys/ioctl.h> 84 #include <sys/errno.h> 85 #include <sys/syslog.h> 86 87 #include <machine/cpu.h> 88 89 #include <net/if.h> 90 #include <net/netisr.h> 91 #include <net/route.h> 92 #include <net/if_llc.h> 93 #include <net/if_dl.h> 94 #include <net/if_types.h> 95 96 #include <net/if_ether.h> 97 #if NVLAN > 0 98 #include <net/if_vlanvar.h> 99 #endif 100 101 #include <netinet/in.h> 102 #ifdef INET 103 #include <netinet/in_var.h> 104 #endif 105 #include <netinet/if_inarp.h> 106 107 #ifdef INET6 108 #ifndef INET 109 #include <netinet/in.h> 110 #endif 111 #include <netinet6/in6_var.h> 112 #include <netinet6/nd6.h> 113 #endif 114 115 #ifdef NS 116 #include <netns/ns.h> 117 #include <netns/ns_if.h> 118 #endif 119 120 #ifdef IPX 121 #include <netipx/ipx.h> 122 #include <netipx/ipx_if.h> 123 #endif 124 125 #ifdef ISO 126 #include <netiso/argo_debug.h> 127 #include <netiso/iso.h> 128 #include <netiso/iso_var.h> 129 #include <netiso/iso_snpac.h> 130 #endif 131 132 #ifdef LLC 133 #include <netccitt/dll.h> 134 #include <netccitt/llc_var.h> 135 #endif 136 137 #if defined(LLC) && defined(CCITT) 138 extern struct ifqueue pkintrq; 139 #endif 140 141 #ifdef NETATALK 142 #include <netatalk/at.h> 143 #include <netatalk/at_var.h> 144 #include <netatalk/at_extern.h> 145 146 #define llc_snap_org_code llc_un.type_snap.org_code 147 #define llc_snap_ether_type llc_un.type_snap.ether_type 148 149 extern u_char at_org_code[3]; 150 extern u_char aarp_org_code[3]; 151 #endif /* NETATALK */ 152 153 u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 154 #define senderr(e) { error = (e); goto bad;} 155 156 #define SIN(x) ((struct sockaddr_in *)x) 157 158 static int ether_output __P((struct ifnet *, struct mbuf *, 159 struct sockaddr *, struct rtentry *)); 160 static void ether_input __P((struct ifnet *, struct mbuf *)); 161 162 /* 163 * Ethernet output routine. 164 * Encapsulate a packet of type family for the local net. 165 * Assumes that ifp is actually pointer to ethercom structure. 166 */ 167 static int 168 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 169 struct rtentry *rt0) 170 { 171 u_int16_t etype = 0; 172 int s, error = 0, hdrcmplt = 0; 173 u_char esrc[6], edst[6]; 174 struct mbuf *m = m0; 175 struct rtentry *rt; 176 struct mbuf *mcopy = (struct mbuf *)0; 177 struct ether_header *eh; 178 #ifdef INET 179 struct arphdr *ah; 180 #endif /* INET */ 181 #ifdef NETATALK 182 struct at_ifaddr *aa; 183 #endif /* NETATALK */ 184 185 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 186 senderr(ENETDOWN); 187 ifp->if_lastchange = time; 188 if ((rt = rt0) != NULL) { 189 if ((rt->rt_flags & RTF_UP) == 0) { 190 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 191 rt->rt_refcnt--; 192 if (rt->rt_ifp != ifp) 193 return (*rt->rt_ifp->if_output) 194 (ifp, m0, dst, rt); 195 } else 196 senderr(EHOSTUNREACH); 197 } 198 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 199 if (rt->rt_gwroute == 0) 200 goto lookup; 201 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 202 rtfree(rt); rt = rt0; 203 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 204 if ((rt = rt->rt_gwroute) == 0) 205 senderr(EHOSTUNREACH); 206 /* the "G" test below also prevents rt == rt0 */ 207 if ((rt->rt_flags & RTF_GATEWAY) || 208 (rt->rt_ifp != ifp)) { 209 rt->rt_refcnt--; 210 rt0->rt_gwroute = 0; 211 senderr(EHOSTUNREACH); 212 } 213 } 214 } 215 if (rt->rt_flags & RTF_REJECT) 216 if (rt->rt_rmx.rmx_expire == 0 || 217 time.tv_sec < rt->rt_rmx.rmx_expire) 218 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 219 } 220 switch (dst->sa_family) { 221 222 #ifdef INET 223 case AF_INET: 224 if (m->m_flags & M_BCAST) 225 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 226 sizeof(edst)); 227 228 else if (m->m_flags & M_MCAST) { 229 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 230 (caddr_t)edst) 231 232 } else if (!arpresolve(ifp, rt, m, dst, edst)) 233 return (0); /* if not yet resolved */ 234 /* If broadcasting on a simplex interface, loopback a copy */ 235 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 236 mcopy = m_copy(m, 0, (int)M_COPYALL); 237 etype = htons(ETHERTYPE_IP); 238 break; 239 240 case AF_ARP: 241 ah = mtod(m, struct arphdr *); 242 if (m->m_flags & M_BCAST) 243 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 244 sizeof(edst)); 245 else 246 bcopy((caddr_t)ar_tha(ah), 247 (caddr_t)edst, sizeof(edst)); 248 249 ah->ar_hrd = htons(ARPHRD_ETHER); 250 251 switch(ntohs(ah->ar_op)) { 252 case ARPOP_REVREQUEST: 253 case ARPOP_REVREPLY: 254 etype = htons(ETHERTYPE_REVARP); 255 break; 256 257 case ARPOP_REQUEST: 258 case ARPOP_REPLY: 259 default: 260 etype = htons(ETHERTYPE_ARP); 261 } 262 263 break; 264 #endif 265 #ifdef INET6 266 case AF_INET6: 267 #ifdef OLDIP6OUTPUT 268 if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst)) 269 return(0); /* if not yet resolves */ 270 #else 271 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 272 /* this must be impossible, so we bark */ 273 printf("nd6_storelladdr failed\n"); 274 return(0); 275 } 276 #endif /* OLDIP6OUTPUT */ 277 etype = htons(ETHERTYPE_IPV6); 278 break; 279 #endif 280 #ifdef NETATALK 281 case AF_APPLETALK: 282 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 283 #ifdef NETATALKDEBUG 284 printf("aarpresolv failed\n"); 285 #endif /* NETATALKDEBUG */ 286 return (0); 287 } 288 /* 289 * ifaddr is the first thing in at_ifaddr 290 */ 291 aa = (struct at_ifaddr *) at_ifawithnet( 292 (struct sockaddr_at *)dst, ifp); 293 if (aa == NULL) 294 goto bad; 295 296 /* 297 * In the phase 2 case, we need to prepend an mbuf for the 298 * llc header. Since we must preserve the value of m, 299 * which is passed to us by value, we m_copy() the first 300 * mbuf, and use it for our llc header. 301 */ 302 if (aa->aa_flags & AFA_PHASE2) { 303 struct llc llc; 304 305 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 306 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 307 llc.llc_control = LLC_UI; 308 bcopy(at_org_code, llc.llc_snap_org_code, 309 sizeof(llc.llc_snap_org_code)); 310 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 311 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 312 } else { 313 etype = htons(ETHERTYPE_ATALK); 314 } 315 break; 316 #endif /* NETATALK */ 317 #ifdef NS 318 case AF_NS: 319 etype = htons(ETHERTYPE_NS); 320 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 321 (caddr_t)edst, sizeof (edst)); 322 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 323 return (looutput(ifp, m, dst, rt)); 324 /* If broadcasting on a simplex interface, loopback a copy */ 325 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 326 mcopy = m_copy(m, 0, (int)M_COPYALL); 327 break; 328 #endif 329 #ifdef IPX 330 case AF_IPX: 331 etype = htons(ETHERTYPE_IPX); 332 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 333 (caddr_t)edst, sizeof (edst)); 334 /* If broadcasting on a simplex interface, loopback a copy */ 335 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 336 mcopy = m_copy(m, 0, (int)M_COPYALL); 337 break; 338 #endif 339 #ifdef ISO 340 case AF_ISO: { 341 int snpalen; 342 struct llc *l; 343 struct sockaddr_dl *sdl; 344 345 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 346 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 347 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 348 } else { 349 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 350 (char *)edst, &snpalen); 351 if (error) 352 goto bad; /* Not Resolved */ 353 } 354 /* If broadcasting on a simplex interface, loopback a copy */ 355 if (*edst & 1) 356 m->m_flags |= (M_BCAST|M_MCAST); 357 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 358 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 359 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 360 if (mcopy) { 361 eh = mtod(mcopy, struct ether_header *); 362 bcopy((caddr_t)edst, 363 (caddr_t)eh->ether_dhost, sizeof (edst)); 364 bcopy(LLADDR(ifp->if_sadl), 365 (caddr_t)eh->ether_shost, sizeof (edst)); 366 } 367 } 368 M_PREPEND(m, 3, M_DONTWAIT); 369 if (m == NULL) 370 return (0); 371 l = mtod(m, struct llc *); 372 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 373 l->llc_control = LLC_UI; 374 #ifdef ARGO_DEBUG 375 if (argo_debug[D_ETHER]) { 376 int i; 377 printf("unoutput: sending pkt to: "); 378 for (i=0; i<6; i++) 379 printf("%x ", edst[i] & 0xff); 380 printf("\n"); 381 } 382 #endif 383 } break; 384 #endif /* ISO */ 385 #ifdef LLC 386 /* case AF_NSAP: */ 387 case AF_CCITT: { 388 struct sockaddr_dl *sdl = 389 (struct sockaddr_dl *) rt -> rt_gateway; 390 391 if (sdl && sdl->sdl_family == AF_LINK 392 && sdl->sdl_alen > 0) { 393 bcopy(LLADDR(sdl), (char *)edst, 394 sizeof(edst)); 395 } else goto bad; /* Not a link interface ? Funny ... */ 396 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 397 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 398 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 399 if (mcopy) { 400 eh = mtod(mcopy, struct ether_header *); 401 bcopy((caddr_t)edst, 402 (caddr_t)eh->ether_dhost, sizeof (edst)); 403 bcopy(LLADDR(ifp->if_sadl), 404 (caddr_t)eh->ether_shost, sizeof (edst)); 405 } 406 } 407 #ifdef LLC_DEBUG 408 { 409 int i; 410 struct llc *l = mtod(m, struct llc *); 411 412 printf("ether_output: sending LLC2 pkt to: "); 413 for (i=0; i<6; i++) 414 printf("%x ", edst[i] & 0xff); 415 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 416 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 417 l->llc_control & 0xff); 418 419 } 420 #endif /* LLC_DEBUG */ 421 } break; 422 #endif /* LLC */ 423 424 case pseudo_AF_HDRCMPLT: 425 hdrcmplt = 1; 426 eh = (struct ether_header *)dst->sa_data; 427 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 428 /* FALLTHROUGH */ 429 430 case AF_UNSPEC: 431 eh = (struct ether_header *)dst->sa_data; 432 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 433 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 434 etype = eh->ether_type; 435 break; 436 437 default: 438 printf("%s: can't handle af%d\n", ifp->if_xname, 439 dst->sa_family); 440 senderr(EAFNOSUPPORT); 441 } 442 443 if (mcopy) 444 (void) looutput(ifp, mcopy, dst, rt); 445 446 /* If no ether type is set, this must be a 802.2 formatted packet. 447 */ 448 if (etype == 0) 449 etype = htons(m->m_pkthdr.len); 450 /* 451 * Add local net header. If no space in first mbuf, 452 * allocate another. 453 */ 454 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 455 if (m == 0) 456 senderr(ENOBUFS); 457 eh = mtod(m, struct ether_header *); 458 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 459 sizeof(eh->ether_type)); 460 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 461 if (hdrcmplt) 462 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 463 sizeof(eh->ether_shost)); 464 else 465 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 466 sizeof(eh->ether_shost)); 467 s = splimp(); 468 /* 469 * Queue message on interface, and start output if interface 470 * not yet active. 471 */ 472 if (IF_QFULL(&ifp->if_snd)) { 473 IF_DROP(&ifp->if_snd); 474 splx(s); 475 senderr(ENOBUFS); 476 } 477 ifp->if_obytes += m->m_pkthdr.len; 478 if (m->m_flags & M_MCAST) 479 ifp->if_omcasts++; 480 IF_ENQUEUE(&ifp->if_snd, m); 481 if ((ifp->if_flags & IFF_OACTIVE) == 0) 482 (*ifp->if_start)(ifp); 483 splx(s); 484 return (error); 485 486 bad: 487 if (m) 488 m_freem(m); 489 return (error); 490 } 491 492 /* 493 * Process a received Ethernet packet; 494 * the packet is in the mbuf chain m with 495 * the ether header. 496 */ 497 static void 498 ether_input(struct ifnet *ifp, struct mbuf *m) 499 { 500 struct ifqueue *inq; 501 u_int16_t etype; 502 int s; 503 struct ether_header *eh; 504 #if defined (ISO) || defined (LLC) || defined(NETATALK) 505 struct llc *l; 506 #endif 507 508 if ((ifp->if_flags & IFF_UP) == 0) { 509 m_freem(m); 510 return; 511 } 512 513 eh = mtod(m, struct ether_header *); 514 etype = ntohs(eh->ether_type); 515 516 /* 517 * Determine if the packet is within its size limits. 518 */ 519 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 520 printf("%s: discarding oversize frame\n", ifp->if_xname); 521 m_freem(m); 522 return; 523 } 524 525 ifp->if_lastchange = time; 526 ifp->if_ibytes += m->m_pkthdr.len; 527 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 528 if (memcmp(etherbroadcastaddr, 529 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 530 m->m_flags |= M_BCAST; 531 else 532 m->m_flags |= M_MCAST; 533 ifp->if_imcasts++; 534 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 535 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 536 ETHER_ADDR_LEN) != 0) { 537 m_freem(m); 538 return; 539 } 540 541 /* 542 * Handle protocols that expect to have the Ethernet header 543 * (and possibly FCS) intact. 544 */ 545 switch (etype) { 546 #if NVLAN > 0 547 case ETHERTYPE_VLAN: 548 /* 549 * vlan_input() will either recursively call ether_input() 550 * or drop the packet. 551 */ 552 if (((struct ethercom *)ifp)->ec_nvlans != 0) 553 vlan_input(ifp, m); 554 return; 555 #endif /* NVLAN > 0 */ 556 default: 557 /* Nothing. */ 558 } 559 560 /* Strip off the Ethernet header. */ 561 m_adj(m, sizeof(struct ether_header)); 562 563 /* If the CRC is still on the packet, trim it off. */ 564 if (m->m_flags & M_HASFCS) 565 m_adj(m, -ETHER_CRC_LEN); 566 567 switch (etype) { 568 #ifdef INET 569 case ETHERTYPE_IP: 570 #ifdef GATEWAY 571 if (ipflow_fastforward(m)) 572 return; 573 #endif 574 schednetisr(NETISR_IP); 575 inq = &ipintrq; 576 break; 577 578 case ETHERTYPE_ARP: 579 schednetisr(NETISR_ARP); 580 inq = &arpintrq; 581 break; 582 583 case ETHERTYPE_REVARP: 584 revarpinput(m); /* XXX queue? */ 585 return; 586 #endif 587 #ifdef INET6 588 case ETHERTYPE_IPV6: 589 schednetisr(NETISR_IPV6); 590 inq = &ip6intrq; 591 break; 592 #endif 593 #ifdef NS 594 case ETHERTYPE_NS: 595 schednetisr(NETISR_NS); 596 inq = &nsintrq; 597 break; 598 599 #endif 600 #ifdef IPX 601 case ETHERTYPE_IPX: 602 schednetisr(NETISR_IPX); 603 inq = &ipxintrq; 604 break; 605 #endif 606 #ifdef NETATALK 607 case ETHERTYPE_ATALK: 608 schednetisr(NETISR_ATALK); 609 inq = &atintrq1; 610 break; 611 case ETHERTYPE_AARP: 612 /* probably this should be done with a NETISR as well */ 613 aarpinput(ifp, m); /* XXX */ 614 return; 615 #endif /* NETATALK */ 616 default: 617 #if defined (ISO) || defined (LLC) || defined (NETATALK) 618 if (etype > ETHERMTU) 619 goto dropanyway; 620 l = mtod(m, struct llc *); 621 switch (l->llc_dsap) { 622 #ifdef NETATALK 623 case LLC_SNAP_LSAP: 624 switch (l->llc_control) { 625 case LLC_UI: 626 if (l->llc_ssap != LLC_SNAP_LSAP) { 627 goto dropanyway; 628 } 629 630 if (Bcmp(&(l->llc_snap_org_code)[0], 631 at_org_code, sizeof(at_org_code)) == 0 && 632 ntohs(l->llc_snap_ether_type) == 633 ETHERTYPE_ATALK) { 634 inq = &atintrq2; 635 m_adj(m, sizeof(struct llc)); 636 schednetisr(NETISR_ATALK); 637 break; 638 } 639 640 if (Bcmp(&(l->llc_snap_org_code)[0], 641 aarp_org_code, 642 sizeof(aarp_org_code)) == 0 && 643 ntohs(l->llc_snap_ether_type) == 644 ETHERTYPE_AARP) { 645 m_adj( m, sizeof(struct llc)); 646 aarpinput(ifp, m); /* XXX */ 647 return; 648 } 649 650 default: 651 goto dropanyway; 652 } 653 break; 654 #endif /* NETATALK */ 655 #ifdef ISO 656 case LLC_ISO_LSAP: 657 switch (l->llc_control) { 658 case LLC_UI: 659 /* LLC_UI_P forbidden in class 1 service */ 660 if ((l->llc_dsap == LLC_ISO_LSAP) && 661 (l->llc_ssap == LLC_ISO_LSAP)) { 662 /* LSAP for ISO */ 663 if (m->m_pkthdr.len > etype) 664 m_adj(m, etype - m->m_pkthdr.len); 665 m->m_data += 3; /* XXX */ 666 m->m_len -= 3; /* XXX */ 667 m->m_pkthdr.len -= 3; /* XXX */ 668 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 669 if (m == 0) 670 return; 671 *mtod(m, struct ether_header *) = *eh; 672 #ifdef ARGO_DEBUG 673 if (argo_debug[D_ETHER]) 674 printf("clnp packet"); 675 #endif 676 schednetisr(NETISR_ISO); 677 inq = &clnlintrq; 678 break; 679 } 680 goto dropanyway; 681 682 case LLC_XID: 683 case LLC_XID_P: 684 if(m->m_len < 6) 685 goto dropanyway; 686 l->llc_window = 0; 687 l->llc_fid = 9; 688 l->llc_class = 1; 689 l->llc_dsap = l->llc_ssap = 0; 690 /* Fall through to */ 691 case LLC_TEST: 692 case LLC_TEST_P: 693 { 694 struct sockaddr sa; 695 struct ether_header *eh2; 696 int i; 697 u_char c = l->llc_dsap; 698 699 l->llc_dsap = l->llc_ssap; 700 l->llc_ssap = c; 701 if (m->m_flags & (M_BCAST | M_MCAST)) 702 bcopy(LLADDR(ifp->if_sadl), 703 (caddr_t)eh->ether_dhost, 6); 704 sa.sa_family = AF_UNSPEC; 705 sa.sa_len = sizeof(sa); 706 eh2 = (struct ether_header *)sa.sa_data; 707 for (i = 0; i < 6; i++) { 708 eh2->ether_shost[i] = c = 709 eh->ether_dhost[i]; 710 eh2->ether_dhost[i] = 711 eh->ether_dhost[i] = 712 eh->ether_shost[i]; 713 eh->ether_shost[i] = c; 714 } 715 ifp->if_output(ifp, m, &sa, NULL); 716 return; 717 } 718 default: 719 m_freem(m); 720 return; 721 } 722 break; 723 #endif /* ISO */ 724 #ifdef LLC 725 case LLC_X25_LSAP: 726 { 727 if (m->m_pkthdr.len > etype) 728 m_adj(m, etype - m->m_pkthdr.len); 729 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 730 if (m == 0) 731 return; 732 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 733 eh->ether_dhost, LLC_X25_LSAP, 6, 734 mtod(m, struct sdl_hdr *))) 735 panic("ETHER cons addr failure"); 736 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 737 #ifdef LLC_DEBUG 738 printf("llc packet\n"); 739 #endif /* LLC_DEBUG */ 740 schednetisr(NETISR_CCITT); 741 inq = &llcintrq; 742 break; 743 } 744 #endif /* LLC */ 745 dropanyway: 746 default: 747 m_freem(m); 748 return; 749 } 750 #else /* ISO || LLC || NETATALK*/ 751 m_freem(m); 752 return; 753 #endif /* ISO || LLC || NETATALK*/ 754 } 755 756 s = splimp(); 757 if (IF_QFULL(inq)) { 758 IF_DROP(inq); 759 m_freem(m); 760 } else 761 IF_ENQUEUE(inq, m); 762 splx(s); 763 } 764 765 /* 766 * Convert Ethernet address to printable (loggable) representation. 767 */ 768 static char digits[] = "0123456789abcdef"; 769 char * 770 ether_sprintf(const u_char *ap) 771 { 772 static char etherbuf[18]; 773 char *cp = etherbuf; 774 int i; 775 776 for (i = 0; i < 6; i++) { 777 *cp++ = digits[*ap >> 4]; 778 *cp++ = digits[*ap++ & 0xf]; 779 *cp++ = ':'; 780 } 781 *--cp = 0; 782 return (etherbuf); 783 } 784 785 /* 786 * Perform common duties while attaching to interface list 787 */ 788 void 789 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 790 { 791 struct sockaddr_dl *sdl; 792 793 ifp->if_type = IFT_ETHER; 794 ifp->if_addrlen = 6; 795 ifp->if_hdrlen = 14; 796 ifp->if_mtu = ETHERMTU; 797 ifp->if_output = ether_output; 798 ifp->if_input = ether_input; 799 if (ifp->if_baudrate == 0) 800 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 801 if ((sdl = ifp->if_sadl) && 802 sdl->sdl_family == AF_LINK) { 803 sdl->sdl_type = IFT_ETHER; 804 sdl->sdl_alen = ifp->if_addrlen; 805 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 806 } 807 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 808 ifp->if_broadcastaddr = etherbroadcastaddr; 809 } 810 811 void 812 ether_ifdetach(struct ifnet *ifp) 813 { 814 struct ethercom *ec = (void *) ifp; 815 struct sockaddr_dl *sdl = ifp->if_sadl; 816 struct ether_multi *enm; 817 int s; 818 819 s = splimp(); 820 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 821 LIST_REMOVE(enm, enm_list); 822 free(enm, M_IFADDR); 823 ec->ec_multicnt--; 824 } 825 splx(s); 826 827 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 828 sdl->sdl_alen = 0; 829 sdl->sdl_type = 0; 830 } 831 832 #if 0 833 /* 834 * This is for reference. We have a table-driven version 835 * of the little-endian crc32 generator, which is faster 836 * than the double-loop. 837 */ 838 u_int32_t 839 ether_crc32_le(const u_int8_t *buf, size_t len) 840 { 841 u_int32_t c, crc, carry; 842 size_t i, j; 843 844 crc = 0xffffffffU; /* initial value */ 845 846 for (i = 0; i < len; i++) { 847 c = buf[i]; 848 for (j = 0; j < 8; j++) { 849 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 850 crc >>= 1; 851 c >>= 1; 852 if (carry) 853 crc = (crc ^ ETHER_CRC_POLY_LE); 854 } 855 } 856 857 return (crc); 858 } 859 #else 860 u_int32_t 861 ether_crc32_le(const u_int8_t *buf, size_t len) 862 { 863 static const u_int32_t crctab[] = { 864 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 865 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 866 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 867 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 868 }; 869 u_int32_t crc; 870 int i; 871 872 crc = 0xffffffffU; /* initial value */ 873 874 for (i = 0; i < len; i++) { 875 crc ^= buf[i]; 876 crc = (crc >> 4) ^ crctab[crc & 0xf]; 877 crc = (crc >> 4) ^ crctab[crc & 0xf]; 878 } 879 880 return (crc); 881 } 882 #endif 883 884 u_int32_t 885 ether_crc32_be(const u_int8_t *buf, size_t len) 886 { 887 u_int32_t c, crc, carry; 888 size_t i, j; 889 890 crc = 0xffffffffU; /* initial value */ 891 892 for (i = 0; i < len; i++) { 893 c = buf[i]; 894 for (j = 0; j < 8; j++) { 895 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 896 crc <<= 1; 897 c >>= 1; 898 if (carry) 899 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 900 } 901 } 902 903 return (crc); 904 } 905 906 #ifdef INET 907 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 908 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 909 #endif 910 #ifdef INET6 911 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 912 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 913 #endif 914 915 /* 916 * Convert a sockaddr into an Ethernet address or range of Ethernet 917 * addresses. 918 */ 919 int 920 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 921 u_int8_t addrhi[ETHER_ADDR_LEN]) 922 { 923 #ifdef INET 924 struct sockaddr_in *sin; 925 #endif /* INET */ 926 #ifdef INET6 927 struct sockaddr_in6 *sin6; 928 #endif /* INET6 */ 929 930 switch (sa->sa_family) { 931 932 case AF_UNSPEC: 933 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 934 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 935 break; 936 937 #ifdef INET 938 case AF_INET: 939 sin = satosin(sa); 940 if (sin->sin_addr.s_addr == INADDR_ANY) { 941 /* 942 * An IP address of INADDR_ANY means listen to 943 * or stop listening to all of the Ethernet 944 * multicast addresses used for IP. 945 * (This is for the sake of IP multicast routers.) 946 */ 947 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 948 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 949 } 950 else { 951 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 952 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 953 } 954 break; 955 #endif 956 #ifdef INET6 957 case AF_INET6: 958 sin6 = satosin6(sa); 959 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 960 /* 961 * An IP6 address of 0 means listen to or stop 962 * listening to all of the Ethernet multicast 963 * address used for IP6. 964 * (This is used for multicast routers.) 965 */ 966 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 967 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 968 } else { 969 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 970 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 971 } 972 break; 973 #endif 974 975 default: 976 return (EAFNOSUPPORT); 977 } 978 return (0); 979 } 980 981 /* 982 * Add an Ethernet multicast address or range of addresses to the list for a 983 * given interface. 984 */ 985 int 986 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 987 { 988 struct ether_multi *enm; 989 u_char addrlo[ETHER_ADDR_LEN]; 990 u_char addrhi[ETHER_ADDR_LEN]; 991 int s = splimp(), error; 992 993 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 994 if (error != 0) { 995 splx(s); 996 return (error); 997 } 998 999 /* 1000 * Verify that we have valid Ethernet multicast addresses. 1001 */ 1002 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1003 splx(s); 1004 return (EINVAL); 1005 } 1006 /* 1007 * See if the address range is already in the list. 1008 */ 1009 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1010 if (enm != NULL) { 1011 /* 1012 * Found it; just increment the reference count. 1013 */ 1014 ++enm->enm_refcount; 1015 splx(s); 1016 return (0); 1017 } 1018 /* 1019 * New address or range; malloc a new multicast record 1020 * and link it into the interface's multicast list. 1021 */ 1022 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1023 if (enm == NULL) { 1024 splx(s); 1025 return (ENOBUFS); 1026 } 1027 bcopy(addrlo, enm->enm_addrlo, 6); 1028 bcopy(addrhi, enm->enm_addrhi, 6); 1029 enm->enm_ec = ec; 1030 enm->enm_refcount = 1; 1031 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1032 ec->ec_multicnt++; 1033 splx(s); 1034 /* 1035 * Return ENETRESET to inform the driver that the list has changed 1036 * and its reception filter should be adjusted accordingly. 1037 */ 1038 return (ENETRESET); 1039 } 1040 1041 /* 1042 * Delete a multicast address record. 1043 */ 1044 int 1045 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1046 { 1047 struct ether_multi *enm; 1048 u_char addrlo[ETHER_ADDR_LEN]; 1049 u_char addrhi[ETHER_ADDR_LEN]; 1050 int s = splimp(), error; 1051 1052 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1053 if (error != 0) { 1054 splx(s); 1055 return (error); 1056 } 1057 1058 /* 1059 * Look up the address in our list. 1060 */ 1061 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1062 if (enm == NULL) { 1063 splx(s); 1064 return (ENXIO); 1065 } 1066 if (--enm->enm_refcount != 0) { 1067 /* 1068 * Still some claims to this record. 1069 */ 1070 splx(s); 1071 return (0); 1072 } 1073 /* 1074 * No remaining claims to this record; unlink and free it. 1075 */ 1076 LIST_REMOVE(enm, enm_list); 1077 free(enm, M_IFMADDR); 1078 ec->ec_multicnt--; 1079 splx(s); 1080 /* 1081 * Return ENETRESET to inform the driver that the list has changed 1082 * and its reception filter should be adjusted accordingly. 1083 */ 1084 return (ENETRESET); 1085 } 1086
Indexes created Sun Sep 21 18:09:52 GMT 2025