if_ethersubr.c revision 1.76
1 /* $NetBSD: if_ethersubr.c,v 1.76 2001/04/07 18:01:48 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 #ifdef ALTQ 508 /* 509 * This routine is a slight hack to allow a packet to be classified 510 * if the Ethernet headers are present. It will go away when ALTQ's 511 * classification engine understands link headers. 512 */ 513 void 514 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 515 struct altq_pktattr *pktattr) 516 { 517 struct ether_header *eh; 518 u_int16_t ether_type; 519 int hlen, af, hdrsize; 520 caddr_t hdr; 521 522 hlen = ETHER_HDR_LEN; 523 eh = mtod(m, struct ether_header *); 524 525 ether_type = htons(eh->ether_type); 526 527 if (ether_type < ETHERMTU) { 528 /* LLC/SNAP */ 529 struct llc *llc = (struct llc *)(eh + 1); 530 hlen += 8; 531 532 if (m->m_len < hlen || 533 llc->llc_dsap != LLC_SNAP_LSAP || 534 llc->llc_ssap != LLC_SNAP_LSAP || 535 llc->llc_control != LLC_UI) { 536 /* Not SNAP. */ 537 goto bad; 538 } 539 540 ether_type = htons(llc->llc_un.type_snap.ether_type); 541 } 542 543 switch (ether_type) { 544 case ETHERTYPE_IP: 545 af = AF_INET; 546 hdrsize = 20; /* sizeof(struct ip) */ 547 break; 548 549 case ETHERTYPE_IPV6: 550 af = AF_INET6; 551 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 552 break; 553 554 default: 555 af = AF_UNSPEC; 556 hdrsize = 0; 557 break; 558 } 559 560 if (m->m_len < (hlen + hdrsize)) { 561 /* 562 * Ethernet and protocol header not in a single 563 * mbuf. We can't cope with this situation right 564 * now (but it shouldn't ever happen, really, anyhow). 565 * XXX Should use m_pulldown(). 566 */ 567 printf("altq_etherclassify: headers span multiple mbufs\n"); 568 goto bad; 569 } 570 571 m->m_data += hlen; 572 m->m_len -= hlen; 573 574 hdr = mtod(m, caddr_t); 575 576 if (ALTQ_NEEDS_CLASSIFY(ifq)) 577 pktattr->pattr_class = 578 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 579 pktattr->pattr_af = af; 580 pktattr->pattr_hdr = hdr; 581 582 m->m_data -= hlen; 583 m->m_len += hlen; 584 585 return; 586 587 bad: 588 pktattr->pattr_class = NULL; 589 pktattr->pattr_hdr = NULL; 590 pktattr->pattr_af = AF_UNSPEC; 591 } 592 #endif /* ALTQ */ 593 594 /* 595 * Process a received Ethernet packet; 596 * the packet is in the mbuf chain m with 597 * the ether header. 598 */ 599 static void 600 ether_input(struct ifnet *ifp, struct mbuf *m) 601 { 602 struct ifqueue *inq; 603 u_int16_t etype; 604 int s; 605 struct ether_header *eh; 606 struct mbuf *n; 607 #if defined (ISO) || defined (LLC) || defined(NETATALK) 608 struct llc *l; 609 #endif 610 611 if ((ifp->if_flags & IFF_UP) == 0) { 612 m_freem(m); 613 return; 614 } 615 616 eh = mtod(m, struct ether_header *); 617 etype = ntohs(eh->ether_type); 618 619 /* 620 * Determine if the packet is within its size limits. 621 */ 622 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 623 printf("%s: discarding oversize frame (len=%d)\n", 624 ifp->if_xname, m->m_pkthdr.len); 625 m_freem(m); 626 return; 627 } 628 629 ifp->if_lastchange = time; 630 ifp->if_ibytes += m->m_pkthdr.len; 631 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 632 if (memcmp(etherbroadcastaddr, 633 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 634 m->m_flags |= M_BCAST; 635 else 636 m->m_flags |= M_MCAST; 637 ifp->if_imcasts++; 638 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 639 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 640 ETHER_ADDR_LEN) != 0) { 641 m_freem(m); 642 return; 643 } 644 645 /* Check if the mbuf has a VLAN tag */ 646 n = m_aux_find(m, AF_LINK, ETHERTYPE_VLAN); 647 if (n) { 648 #if NVLAN > 0 649 /* 650 * vlan_input() will either recursively call ether_input() 651 * or drop the packet. 652 */ 653 if (((struct ethercom *)ifp)->ec_nvlans != 0) 654 vlan_input(ifp, m); 655 else 656 #endif 657 m_freem(m); 658 return; 659 } 660 661 /* 662 * Handle protocols that expect to have the Ethernet header 663 * (and possibly FCS) intact. 664 */ 665 switch (etype) { 666 #if NVLAN > 0 667 case ETHERTYPE_VLAN: 668 /* 669 * vlan_input() will either recursively call ether_input() 670 * or drop the packet. 671 */ 672 if (((struct ethercom *)ifp)->ec_nvlans != 0) 673 vlan_input(ifp, m); 674 else 675 m_freem(m); 676 return; 677 #endif /* NVLAN > 0 */ 678 default: 679 /* Nothing. */ 680 } 681 682 /* Strip off the Ethernet header. */ 683 m_adj(m, sizeof(struct ether_header)); 684 685 /* If the CRC is still on the packet, trim it off. */ 686 if (m->m_flags & M_HASFCS) 687 m_adj(m, -ETHER_CRC_LEN); 688 689 switch (etype) { 690 #ifdef INET 691 case ETHERTYPE_IP: 692 #ifdef GATEWAY 693 if (ipflow_fastforward(m)) 694 return; 695 #endif 696 schednetisr(NETISR_IP); 697 inq = &ipintrq; 698 break; 699 700 case ETHERTYPE_ARP: 701 schednetisr(NETISR_ARP); 702 inq = &arpintrq; 703 break; 704 705 case ETHERTYPE_REVARP: 706 revarpinput(m); /* XXX queue? */ 707 return; 708 #endif 709 #ifdef INET6 710 case ETHERTYPE_IPV6: 711 schednetisr(NETISR_IPV6); 712 inq = &ip6intrq; 713 break; 714 #endif 715 #ifdef NS 716 case ETHERTYPE_NS: 717 schednetisr(NETISR_NS); 718 inq = &nsintrq; 719 break; 720 721 #endif 722 #ifdef IPX 723 case ETHERTYPE_IPX: 724 schednetisr(NETISR_IPX); 725 inq = &ipxintrq; 726 break; 727 #endif 728 #ifdef NETATALK 729 case ETHERTYPE_ATALK: 730 schednetisr(NETISR_ATALK); 731 inq = &atintrq1; 732 break; 733 case ETHERTYPE_AARP: 734 /* probably this should be done with a NETISR as well */ 735 aarpinput(ifp, m); /* XXX */ 736 return; 737 #endif /* NETATALK */ 738 default: 739 #if defined (ISO) || defined (LLC) || defined (NETATALK) 740 if (etype > ETHERMTU) 741 goto dropanyway; 742 l = mtod(m, struct llc *); 743 switch (l->llc_dsap) { 744 #ifdef NETATALK 745 case LLC_SNAP_LSAP: 746 switch (l->llc_control) { 747 case LLC_UI: 748 if (l->llc_ssap != LLC_SNAP_LSAP) { 749 goto dropanyway; 750 } 751 752 if (Bcmp(&(l->llc_snap_org_code)[0], 753 at_org_code, sizeof(at_org_code)) == 0 && 754 ntohs(l->llc_snap_ether_type) == 755 ETHERTYPE_ATALK) { 756 inq = &atintrq2; 757 m_adj(m, sizeof(struct llc)); 758 schednetisr(NETISR_ATALK); 759 break; 760 } 761 762 if (Bcmp(&(l->llc_snap_org_code)[0], 763 aarp_org_code, 764 sizeof(aarp_org_code)) == 0 && 765 ntohs(l->llc_snap_ether_type) == 766 ETHERTYPE_AARP) { 767 m_adj( m, sizeof(struct llc)); 768 aarpinput(ifp, m); /* XXX */ 769 return; 770 } 771 772 default: 773 goto dropanyway; 774 } 775 break; 776 #endif /* NETATALK */ 777 #ifdef ISO 778 case LLC_ISO_LSAP: 779 switch (l->llc_control) { 780 case LLC_UI: 781 /* LLC_UI_P forbidden in class 1 service */ 782 if ((l->llc_dsap == LLC_ISO_LSAP) && 783 (l->llc_ssap == LLC_ISO_LSAP)) { 784 /* LSAP for ISO */ 785 if (m->m_pkthdr.len > etype) 786 m_adj(m, etype - m->m_pkthdr.len); 787 m->m_data += 3; /* XXX */ 788 m->m_len -= 3; /* XXX */ 789 m->m_pkthdr.len -= 3; /* XXX */ 790 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 791 if (m == 0) 792 return; 793 *mtod(m, struct ether_header *) = *eh; 794 #ifdef ARGO_DEBUG 795 if (argo_debug[D_ETHER]) 796 printf("clnp packet"); 797 #endif 798 schednetisr(NETISR_ISO); 799 inq = &clnlintrq; 800 break; 801 } 802 goto dropanyway; 803 804 case LLC_XID: 805 case LLC_XID_P: 806 if(m->m_len < 6) 807 goto dropanyway; 808 l->llc_window = 0; 809 l->llc_fid = 9; 810 l->llc_class = 1; 811 l->llc_dsap = l->llc_ssap = 0; 812 /* Fall through to */ 813 case LLC_TEST: 814 case LLC_TEST_P: 815 { 816 struct sockaddr sa; 817 struct ether_header *eh2; 818 int i; 819 u_char c = l->llc_dsap; 820 821 l->llc_dsap = l->llc_ssap; 822 l->llc_ssap = c; 823 if (m->m_flags & (M_BCAST | M_MCAST)) 824 bcopy(LLADDR(ifp->if_sadl), 825 (caddr_t)eh->ether_dhost, 6); 826 sa.sa_family = AF_UNSPEC; 827 sa.sa_len = sizeof(sa); 828 eh2 = (struct ether_header *)sa.sa_data; 829 for (i = 0; i < 6; i++) { 830 eh2->ether_shost[i] = c = 831 eh->ether_dhost[i]; 832 eh2->ether_dhost[i] = 833 eh->ether_dhost[i] = 834 eh->ether_shost[i]; 835 eh->ether_shost[i] = c; 836 } 837 ifp->if_output(ifp, m, &sa, NULL); 838 return; 839 } 840 default: 841 m_freem(m); 842 return; 843 } 844 break; 845 #endif /* ISO */ 846 #ifdef LLC 847 case LLC_X25_LSAP: 848 { 849 if (m->m_pkthdr.len > etype) 850 m_adj(m, etype - m->m_pkthdr.len); 851 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 852 if (m == 0) 853 return; 854 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 855 eh->ether_dhost, LLC_X25_LSAP, 6, 856 mtod(m, struct sdl_hdr *))) 857 panic("ETHER cons addr failure"); 858 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 859 #ifdef LLC_DEBUG 860 printf("llc packet\n"); 861 #endif /* LLC_DEBUG */ 862 schednetisr(NETISR_CCITT); 863 inq = &llcintrq; 864 break; 865 } 866 #endif /* LLC */ 867 dropanyway: 868 default: 869 m_freem(m); 870 return; 871 } 872 #else /* ISO || LLC || NETATALK*/ 873 m_freem(m); 874 return; 875 #endif /* ISO || LLC || NETATALK*/ 876 } 877 878 s = splimp(); 879 if (IF_QFULL(inq)) { 880 IF_DROP(inq); 881 m_freem(m); 882 } else 883 IF_ENQUEUE(inq, m); 884 splx(s); 885 } 886 887 /* 888 * Convert Ethernet address to printable (loggable) representation. 889 */ 890 static char digits[] = "0123456789abcdef"; 891 char * 892 ether_sprintf(const u_char *ap) 893 { 894 static char etherbuf[18]; 895 char *cp = etherbuf; 896 int i; 897 898 for (i = 0; i < 6; i++) { 899 *cp++ = digits[*ap >> 4]; 900 *cp++ = digits[*ap++ & 0xf]; 901 *cp++ = ':'; 902 } 903 *--cp = 0; 904 return (etherbuf); 905 } 906 907 /* 908 * Perform common duties while attaching to interface list 909 */ 910 void 911 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 912 { 913 914 ifp->if_type = IFT_ETHER; 915 ifp->if_addrlen = ETHER_ADDR_LEN; 916 ifp->if_hdrlen = 14; 917 ifp->if_dlt = DLT_EN10MB; 918 ifp->if_mtu = ETHERMTU; 919 ifp->if_output = ether_output; 920 ifp->if_input = ether_input; 921 if (ifp->if_baudrate == 0) 922 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 923 924 if_alloc_sadl(ifp); 925 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 926 927 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 928 ifp->if_broadcastaddr = etherbroadcastaddr; 929 #if NBPFILTER > 0 930 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 931 #endif 932 } 933 934 void 935 ether_ifdetach(struct ifnet *ifp) 936 { 937 struct ethercom *ec = (void *) ifp; 938 struct ether_multi *enm; 939 int s; 940 941 #if NBPFILTER > 0 942 bpfdetach(ifp); 943 #endif 944 945 #if NVLAN > 0 946 if (ec->ec_nvlans) 947 vlan_ifdetach(ifp); 948 #endif 949 950 s = splimp(); 951 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 952 LIST_REMOVE(enm, enm_list); 953 free(enm, M_IFADDR); 954 ec->ec_multicnt--; 955 } 956 splx(s); 957 958 if_free_sadl(ifp); 959 } 960 961 #if 0 962 /* 963 * This is for reference. We have a table-driven version 964 * of the little-endian crc32 generator, which is faster 965 * than the double-loop. 966 */ 967 u_int32_t 968 ether_crc32_le(const u_int8_t *buf, size_t len) 969 { 970 u_int32_t c, crc, carry; 971 size_t i, j; 972 973 crc = 0xffffffffU; /* initial value */ 974 975 for (i = 0; i < len; i++) { 976 c = buf[i]; 977 for (j = 0; j < 8; j++) { 978 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 979 crc >>= 1; 980 c >>= 1; 981 if (carry) 982 crc = (crc ^ ETHER_CRC_POLY_LE); 983 } 984 } 985 986 return (crc); 987 } 988 #else 989 u_int32_t 990 ether_crc32_le(const u_int8_t *buf, size_t len) 991 { 992 static const u_int32_t crctab[] = { 993 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 994 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 995 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 996 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 997 }; 998 u_int32_t crc; 999 int i; 1000 1001 crc = 0xffffffffU; /* initial value */ 1002 1003 for (i = 0; i < len; i++) { 1004 crc ^= buf[i]; 1005 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1006 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1007 } 1008 1009 return (crc); 1010 } 1011 #endif 1012 1013 u_int32_t 1014 ether_crc32_be(const u_int8_t *buf, size_t len) 1015 { 1016 u_int32_t c, crc, carry; 1017 size_t i, j; 1018 1019 crc = 0xffffffffU; /* initial value */ 1020 1021 for (i = 0; i < len; i++) { 1022 c = buf[i]; 1023 for (j = 0; j < 8; j++) { 1024 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1025 crc <<= 1; 1026 c >>= 1; 1027 if (carry) 1028 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1029 } 1030 } 1031 1032 return (crc); 1033 } 1034 1035 #ifdef INET 1036 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1037 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1038 #endif 1039 #ifdef INET6 1040 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1041 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1042 #endif 1043 1044 /* 1045 * Convert a sockaddr into an Ethernet address or range of Ethernet 1046 * addresses. 1047 */ 1048 int 1049 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1050 u_int8_t addrhi[ETHER_ADDR_LEN]) 1051 { 1052 #ifdef INET 1053 struct sockaddr_in *sin; 1054 #endif /* INET */ 1055 #ifdef INET6 1056 struct sockaddr_in6 *sin6; 1057 #endif /* INET6 */ 1058 1059 switch (sa->sa_family) { 1060 1061 case AF_UNSPEC: 1062 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1063 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1064 break; 1065 1066 #ifdef INET 1067 case AF_INET: 1068 sin = satosin(sa); 1069 if (sin->sin_addr.s_addr == INADDR_ANY) { 1070 /* 1071 * An IP address of INADDR_ANY means listen to 1072 * or stop listening to all of the Ethernet 1073 * multicast addresses used for IP. 1074 * (This is for the sake of IP multicast routers.) 1075 */ 1076 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1077 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1078 } 1079 else { 1080 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1081 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1082 } 1083 break; 1084 #endif 1085 #ifdef INET6 1086 case AF_INET6: 1087 sin6 = satosin6(sa); 1088 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1089 /* 1090 * An IP6 address of 0 means listen to or stop 1091 * listening to all of the Ethernet multicast 1092 * address used for IP6. 1093 * (This is used for multicast routers.) 1094 */ 1095 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1096 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1097 } else { 1098 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1099 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1100 } 1101 break; 1102 #endif 1103 1104 default: 1105 return (EAFNOSUPPORT); 1106 } 1107 return (0); 1108 } 1109 1110 /* 1111 * Add an Ethernet multicast address or range of addresses to the list for a 1112 * given interface. 1113 */ 1114 int 1115 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1116 { 1117 struct ether_multi *enm; 1118 u_char addrlo[ETHER_ADDR_LEN]; 1119 u_char addrhi[ETHER_ADDR_LEN]; 1120 int s = splimp(), error; 1121 1122 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1123 if (error != 0) { 1124 splx(s); 1125 return (error); 1126 } 1127 1128 /* 1129 * Verify that we have valid Ethernet multicast addresses. 1130 */ 1131 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1132 splx(s); 1133 return (EINVAL); 1134 } 1135 /* 1136 * See if the address range is already in the list. 1137 */ 1138 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1139 if (enm != NULL) { 1140 /* 1141 * Found it; just increment the reference count. 1142 */ 1143 ++enm->enm_refcount; 1144 splx(s); 1145 return (0); 1146 } 1147 /* 1148 * New address or range; malloc a new multicast record 1149 * and link it into the interface's multicast list. 1150 */ 1151 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1152 if (enm == NULL) { 1153 splx(s); 1154 return (ENOBUFS); 1155 } 1156 bcopy(addrlo, enm->enm_addrlo, 6); 1157 bcopy(addrhi, enm->enm_addrhi, 6); 1158 enm->enm_ec = ec; 1159 enm->enm_refcount = 1; 1160 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1161 ec->ec_multicnt++; 1162 splx(s); 1163 /* 1164 * Return ENETRESET to inform the driver that the list has changed 1165 * and its reception filter should be adjusted accordingly. 1166 */ 1167 return (ENETRESET); 1168 } 1169 1170 /* 1171 * Delete a multicast address record. 1172 */ 1173 int 1174 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1175 { 1176 struct ether_multi *enm; 1177 u_char addrlo[ETHER_ADDR_LEN]; 1178 u_char addrhi[ETHER_ADDR_LEN]; 1179 int s = splimp(), error; 1180 1181 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1182 if (error != 0) { 1183 splx(s); 1184 return (error); 1185 } 1186 1187 /* 1188 * Look ur the address in our list. 1189 */ 1190 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1191 if (enm == NULL) { 1192 splx(s); 1193 return (ENXIO); 1194 } 1195 if (--enm->enm_refcount != 0) { 1196 /* 1197 * Still some claims to this record. 1198 */ 1199 splx(s); 1200 return (0); 1201 } 1202 /* 1203 * No remaining claims to this record; unlink and free it. 1204 */ 1205 LIST_REMOVE(enm, enm_list); 1206 free(enm, M_IFMADDR); 1207 ec->ec_multicnt--; 1208 splx(s); 1209 /* 1210 * Return ENETRESET to inform the driver that the list has changed 1211 * and its reception filter should be adjusted accordingly. 1212 */ 1213 return (ENETRESET); 1214 } 1215 1216 /* 1217 * Common ioctls for Ethernet interfaces. Note, we must be 1218 * called at splnet(). 1219 */ 1220 int 1221 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1222 { 1223 struct ethercom *ec = (void *) ifp; 1224 struct ifreq *ifr = (struct ifreq *)data; 1225 struct ifaddr *ifa = (struct ifaddr *)data; 1226 int error = 0; 1227 1228 switch (cmd) { 1229 case SIOCSIFADDR: 1230 ifp->if_flags |= IFF_UP; 1231 switch (ifa->ifa_addr->sa_family) { 1232 case AF_LINK: 1233 { 1234 struct sockaddr_dl *sdl = 1235 (struct sockaddr_dl *) ifa->ifa_addr; 1236 1237 if (sdl->sdl_type != IFT_ETHER || 1238 sdl->sdl_alen != ifp->if_addrlen) { 1239 error = EINVAL; 1240 break; 1241 } 1242 1243 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1244 ifp->if_addrlen); 1245 1246 /* Set new address. */ 1247 error = (*ifp->if_init)(ifp); 1248 break; 1249 } 1250 #ifdef INET 1251 case AF_INET: 1252 if ((error = (*ifp->if_init)(ifp)) != 0) 1253 break; 1254 arp_ifinit(ifp, ifa); 1255 break; 1256 #endif /* INET */ 1257 #ifdef NS 1258 case AF_NS: 1259 { 1260 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1261 1262 if (ns_nullhost(*ina)) 1263 ina->x_host = *(union ns_host *) 1264 LLADDR(ifp->if_sadl); 1265 else 1266 memcpy(LLADDR(ifp->if_sadl), 1267 ina->x_host.c_host, ifp->if_addrlen); 1268 /* Set new address. */ 1269 error = (*ifp->if_init)(ifp); 1270 break; 1271 } 1272 #endif /* NS */ 1273 default: 1274 error = (*ifp->if_init)(ifp); 1275 break; 1276 } 1277 break; 1278 1279 case SIOCGIFADDR: 1280 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1281 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1282 break; 1283 1284 case SIOCSIFMTU: 1285 if (ifr->ifr_mtu > ETHERMTU) 1286 error = EINVAL; 1287 else 1288 ifp->if_mtu = ifr->ifr_mtu; 1289 break; 1290 1291 case SIOCSIFFLAGS: 1292 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1293 /* 1294 * If interface is marked down and it is running, 1295 * then stop and disable it. 1296 */ 1297 (*ifp->if_stop)(ifp, 1); 1298 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1299 /* 1300 * If interface is marked up and it is stopped, then 1301 * start it. 1302 */ 1303 error = (*ifp->if_init)(ifp); 1304 } else if ((ifp->if_flags & IFF_UP) != 0) { 1305 /* 1306 * Reset the interface to pick up changes in any other 1307 * flags that affect the hardware state. 1308 */ 1309 error = (*ifp->if_init)(ifp); 1310 } 1311 break; 1312 1313 case SIOCADDMULTI: 1314 error = ether_addmulti(ifr, ec); 1315 break; 1316 1317 case SIOCDELMULTI: 1318 error = ether_delmulti(ifr, ec); 1319 break; 1320 1321 default: 1322 error = ENOTTY; 1323 } 1324 1325 return (error); 1326 } 1327
Indexes created Mon Sep 22 13:09:51 GMT 2025