if_ethersubr.c revision 1.68
1 /* $NetBSD: if_ethersubr.c,v 1.68 2000/10/15 19:49:55 matt 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 /* something bad happened */ 273 return(0); 274 } 275 #endif /* OLDIP6OUTPUT */ 276 etype = htons(ETHERTYPE_IPV6); 277 break; 278 #endif 279 #ifdef NETATALK 280 case AF_APPLETALK: 281 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 282 #ifdef NETATALKDEBUG 283 printf("aarpresolv failed\n"); 284 #endif /* NETATALKDEBUG */ 285 return (0); 286 } 287 /* 288 * ifaddr is the first thing in at_ifaddr 289 */ 290 aa = (struct at_ifaddr *) at_ifawithnet( 291 (struct sockaddr_at *)dst, ifp); 292 if (aa == NULL) 293 goto bad; 294 295 /* 296 * In the phase 2 case, we need to prepend an mbuf for the 297 * llc header. Since we must preserve the value of m, 298 * which is passed to us by value, we m_copy() the first 299 * mbuf, and use it for our llc header. 300 */ 301 if (aa->aa_flags & AFA_PHASE2) { 302 struct llc llc; 303 304 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 305 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 306 llc.llc_control = LLC_UI; 307 bcopy(at_org_code, llc.llc_snap_org_code, 308 sizeof(llc.llc_snap_org_code)); 309 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 310 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 311 } else { 312 etype = htons(ETHERTYPE_ATALK); 313 } 314 break; 315 #endif /* NETATALK */ 316 #ifdef NS 317 case AF_NS: 318 etype = htons(ETHERTYPE_NS); 319 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 320 (caddr_t)edst, sizeof (edst)); 321 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 322 return (looutput(ifp, m, dst, rt)); 323 /* If broadcasting on a simplex interface, loopback a copy */ 324 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 325 mcopy = m_copy(m, 0, (int)M_COPYALL); 326 break; 327 #endif 328 #ifdef IPX 329 case AF_IPX: 330 etype = htons(ETHERTYPE_IPX); 331 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 332 (caddr_t)edst, sizeof (edst)); 333 /* If broadcasting on a simplex interface, loopback a copy */ 334 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 335 mcopy = m_copy(m, 0, (int)M_COPYALL); 336 break; 337 #endif 338 #ifdef ISO 339 case AF_ISO: { 340 int snpalen; 341 struct llc *l; 342 struct sockaddr_dl *sdl; 343 344 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 345 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 346 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 347 } else { 348 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 349 (char *)edst, &snpalen); 350 if (error) 351 goto bad; /* Not Resolved */ 352 } 353 /* If broadcasting on a simplex interface, loopback a copy */ 354 if (*edst & 1) 355 m->m_flags |= (M_BCAST|M_MCAST); 356 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 357 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 358 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 359 if (mcopy) { 360 eh = mtod(mcopy, struct ether_header *); 361 bcopy((caddr_t)edst, 362 (caddr_t)eh->ether_dhost, sizeof (edst)); 363 bcopy(LLADDR(ifp->if_sadl), 364 (caddr_t)eh->ether_shost, sizeof (edst)); 365 } 366 } 367 M_PREPEND(m, 3, M_DONTWAIT); 368 if (m == NULL) 369 return (0); 370 l = mtod(m, struct llc *); 371 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 372 l->llc_control = LLC_UI; 373 #ifdef ARGO_DEBUG 374 if (argo_debug[D_ETHER]) { 375 int i; 376 printf("unoutput: sending pkt to: "); 377 for (i=0; i<6; i++) 378 printf("%x ", edst[i] & 0xff); 379 printf("\n"); 380 } 381 #endif 382 } break; 383 #endif /* ISO */ 384 #ifdef LLC 385 /* case AF_NSAP: */ 386 case AF_CCITT: { 387 struct sockaddr_dl *sdl = 388 (struct sockaddr_dl *) rt -> rt_gateway; 389 390 if (sdl && sdl->sdl_family == AF_LINK 391 && sdl->sdl_alen > 0) { 392 bcopy(LLADDR(sdl), (char *)edst, 393 sizeof(edst)); 394 } else goto bad; /* Not a link interface ? Funny ... */ 395 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 396 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 397 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 398 if (mcopy) { 399 eh = mtod(mcopy, struct ether_header *); 400 bcopy((caddr_t)edst, 401 (caddr_t)eh->ether_dhost, sizeof (edst)); 402 bcopy(LLADDR(ifp->if_sadl), 403 (caddr_t)eh->ether_shost, sizeof (edst)); 404 } 405 } 406 #ifdef LLC_DEBUG 407 { 408 int i; 409 struct llc *l = mtod(m, struct llc *); 410 411 printf("ether_output: sending LLC2 pkt to: "); 412 for (i=0; i<6; i++) 413 printf("%x ", edst[i] & 0xff); 414 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 415 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 416 l->llc_control & 0xff); 417 418 } 419 #endif /* LLC_DEBUG */ 420 } break; 421 #endif /* LLC */ 422 423 case pseudo_AF_HDRCMPLT: 424 hdrcmplt = 1; 425 eh = (struct ether_header *)dst->sa_data; 426 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 427 /* FALLTHROUGH */ 428 429 case AF_UNSPEC: 430 eh = (struct ether_header *)dst->sa_data; 431 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 432 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 433 etype = eh->ether_type; 434 break; 435 436 default: 437 printf("%s: can't handle af%d\n", ifp->if_xname, 438 dst->sa_family); 439 senderr(EAFNOSUPPORT); 440 } 441 442 if (mcopy) 443 (void) looutput(ifp, mcopy, dst, rt); 444 445 /* If no ether type is set, this must be a 802.2 formatted packet. 446 */ 447 if (etype == 0) 448 etype = htons(m->m_pkthdr.len); 449 /* 450 * Add local net header. If no space in first mbuf, 451 * allocate another. 452 */ 453 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 454 if (m == 0) 455 senderr(ENOBUFS); 456 eh = mtod(m, struct ether_header *); 457 bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 458 sizeof(eh->ether_type)); 459 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 460 if (hdrcmplt) 461 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 462 sizeof(eh->ether_shost)); 463 else 464 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 465 sizeof(eh->ether_shost)); 466 s = splimp(); 467 /* 468 * Queue message on interface, and start output if interface 469 * not yet active. 470 */ 471 if (IF_QFULL(&ifp->if_snd)) { 472 IF_DROP(&ifp->if_snd); 473 splx(s); 474 senderr(ENOBUFS); 475 } 476 ifp->if_obytes += m->m_pkthdr.len; 477 if (m->m_flags & M_MCAST) 478 ifp->if_omcasts++; 479 IF_ENQUEUE(&ifp->if_snd, m); 480 if ((ifp->if_flags & IFF_OACTIVE) == 0) 481 (*ifp->if_start)(ifp); 482 splx(s); 483 return (error); 484 485 bad: 486 if (m) 487 m_freem(m); 488 return (error); 489 } 490 491 /* 492 * Process a received Ethernet packet; 493 * the packet is in the mbuf chain m with 494 * the ether header. 495 */ 496 static void 497 ether_input(struct ifnet *ifp, struct mbuf *m) 498 { 499 struct ifqueue *inq; 500 u_int16_t etype; 501 int s; 502 struct ether_header *eh; 503 #if defined (ISO) || defined (LLC) || defined(NETATALK) 504 struct llc *l; 505 #endif 506 507 if ((ifp->if_flags & IFF_UP) == 0) { 508 m_freem(m); 509 return; 510 } 511 512 eh = mtod(m, struct ether_header *); 513 etype = ntohs(eh->ether_type); 514 515 /* 516 * Determine if the packet is within its size limits. 517 */ 518 if (m->m_pkthdr.len > ETHER_MAX_FRAME(etype, m->m_flags & M_HASFCS)) { 519 printf("%s: discarding oversize frame (len=%d)\n", 520 ifp->if_xname, m->m_pkthdr.len); 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 else 555 m_freem(m); 556 return; 557 #endif /* NVLAN > 0 */ 558 default: 559 /* Nothing. */ 560 } 561 562 /* Strip off the Ethernet header. */ 563 m_adj(m, sizeof(struct ether_header)); 564 565 /* If the CRC is still on the packet, trim it off. */ 566 if (m->m_flags & M_HASFCS) 567 m_adj(m, -ETHER_CRC_LEN); 568 569 switch (etype) { 570 #ifdef INET 571 case ETHERTYPE_IP: 572 #ifdef GATEWAY 573 if (ipflow_fastforward(m)) 574 return; 575 #endif 576 schednetisr(NETISR_IP); 577 inq = &ipintrq; 578 break; 579 580 case ETHERTYPE_ARP: 581 schednetisr(NETISR_ARP); 582 inq = &arpintrq; 583 break; 584 585 case ETHERTYPE_REVARP: 586 revarpinput(m); /* XXX queue? */ 587 return; 588 #endif 589 #ifdef INET6 590 case ETHERTYPE_IPV6: 591 schednetisr(NETISR_IPV6); 592 inq = &ip6intrq; 593 break; 594 #endif 595 #ifdef NS 596 case ETHERTYPE_NS: 597 schednetisr(NETISR_NS); 598 inq = &nsintrq; 599 break; 600 601 #endif 602 #ifdef IPX 603 case ETHERTYPE_IPX: 604 schednetisr(NETISR_IPX); 605 inq = &ipxintrq; 606 break; 607 #endif 608 #ifdef NETATALK 609 case ETHERTYPE_ATALK: 610 schednetisr(NETISR_ATALK); 611 inq = &atintrq1; 612 break; 613 case ETHERTYPE_AARP: 614 /* probably this should be done with a NETISR as well */ 615 aarpinput(ifp, m); /* XXX */ 616 return; 617 #endif /* NETATALK */ 618 default: 619 #if defined (ISO) || defined (LLC) || defined (NETATALK) 620 if (etype > ETHERMTU) 621 goto dropanyway; 622 l = mtod(m, struct llc *); 623 switch (l->llc_dsap) { 624 #ifdef NETATALK 625 case LLC_SNAP_LSAP: 626 switch (l->llc_control) { 627 case LLC_UI: 628 if (l->llc_ssap != LLC_SNAP_LSAP) { 629 goto dropanyway; 630 } 631 632 if (Bcmp(&(l->llc_snap_org_code)[0], 633 at_org_code, sizeof(at_org_code)) == 0 && 634 ntohs(l->llc_snap_ether_type) == 635 ETHERTYPE_ATALK) { 636 inq = &atintrq2; 637 m_adj(m, sizeof(struct llc)); 638 schednetisr(NETISR_ATALK); 639 break; 640 } 641 642 if (Bcmp(&(l->llc_snap_org_code)[0], 643 aarp_org_code, 644 sizeof(aarp_org_code)) == 0 && 645 ntohs(l->llc_snap_ether_type) == 646 ETHERTYPE_AARP) { 647 m_adj( m, sizeof(struct llc)); 648 aarpinput(ifp, m); /* XXX */ 649 return; 650 } 651 652 default: 653 goto dropanyway; 654 } 655 break; 656 #endif /* NETATALK */ 657 #ifdef ISO 658 case LLC_ISO_LSAP: 659 switch (l->llc_control) { 660 case LLC_UI: 661 /* LLC_UI_P forbidden in class 1 service */ 662 if ((l->llc_dsap == LLC_ISO_LSAP) && 663 (l->llc_ssap == LLC_ISO_LSAP)) { 664 /* LSAP for ISO */ 665 if (m->m_pkthdr.len > etype) 666 m_adj(m, etype - m->m_pkthdr.len); 667 m->m_data += 3; /* XXX */ 668 m->m_len -= 3; /* XXX */ 669 m->m_pkthdr.len -= 3; /* XXX */ 670 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 671 if (m == 0) 672 return; 673 *mtod(m, struct ether_header *) = *eh; 674 #ifdef ARGO_DEBUG 675 if (argo_debug[D_ETHER]) 676 printf("clnp packet"); 677 #endif 678 schednetisr(NETISR_ISO); 679 inq = &clnlintrq; 680 break; 681 } 682 goto dropanyway; 683 684 case LLC_XID: 685 case LLC_XID_P: 686 if(m->m_len < 6) 687 goto dropanyway; 688 l->llc_window = 0; 689 l->llc_fid = 9; 690 l->llc_class = 1; 691 l->llc_dsap = l->llc_ssap = 0; 692 /* Fall through to */ 693 case LLC_TEST: 694 case LLC_TEST_P: 695 { 696 struct sockaddr sa; 697 struct ether_header *eh2; 698 int i; 699 u_char c = l->llc_dsap; 700 701 l->llc_dsap = l->llc_ssap; 702 l->llc_ssap = c; 703 if (m->m_flags & (M_BCAST | M_MCAST)) 704 bcopy(LLADDR(ifp->if_sadl), 705 (caddr_t)eh->ether_dhost, 6); 706 sa.sa_family = AF_UNSPEC; 707 sa.sa_len = sizeof(sa); 708 eh2 = (struct ether_header *)sa.sa_data; 709 for (i = 0; i < 6; i++) { 710 eh2->ether_shost[i] = c = 711 eh->ether_dhost[i]; 712 eh2->ether_dhost[i] = 713 eh->ether_dhost[i] = 714 eh->ether_shost[i]; 715 eh->ether_shost[i] = c; 716 } 717 ifp->if_output(ifp, m, &sa, NULL); 718 return; 719 } 720 default: 721 m_freem(m); 722 return; 723 } 724 break; 725 #endif /* ISO */ 726 #ifdef LLC 727 case LLC_X25_LSAP: 728 { 729 if (m->m_pkthdr.len > etype) 730 m_adj(m, etype - m->m_pkthdr.len); 731 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 732 if (m == 0) 733 return; 734 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 735 eh->ether_dhost, LLC_X25_LSAP, 6, 736 mtod(m, struct sdl_hdr *))) 737 panic("ETHER cons addr failure"); 738 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 739 #ifdef LLC_DEBUG 740 printf("llc packet\n"); 741 #endif /* LLC_DEBUG */ 742 schednetisr(NETISR_CCITT); 743 inq = &llcintrq; 744 break; 745 } 746 #endif /* LLC */ 747 dropanyway: 748 default: 749 m_freem(m); 750 return; 751 } 752 #else /* ISO || LLC || NETATALK*/ 753 m_freem(m); 754 return; 755 #endif /* ISO || LLC || NETATALK*/ 756 } 757 758 s = splimp(); 759 if (IF_QFULL(inq)) { 760 IF_DROP(inq); 761 m_freem(m); 762 } else 763 IF_ENQUEUE(inq, m); 764 splx(s); 765 } 766 767 /* 768 * Convert Ethernet address to printable (loggable) representation. 769 */ 770 static char digits[] = "0123456789abcdef"; 771 char * 772 ether_sprintf(const u_char *ap) 773 { 774 static char etherbuf[18]; 775 char *cp = etherbuf; 776 int i; 777 778 for (i = 0; i < 6; i++) { 779 *cp++ = digits[*ap >> 4]; 780 *cp++ = digits[*ap++ & 0xf]; 781 *cp++ = ':'; 782 } 783 *--cp = 0; 784 return (etherbuf); 785 } 786 787 /* 788 * Perform common duties while attaching to interface list 789 */ 790 void 791 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 792 { 793 struct sockaddr_dl *sdl; 794 795 ifp->if_type = IFT_ETHER; 796 ifp->if_addrlen = 6; 797 ifp->if_hdrlen = 14; 798 ifp->if_mtu = ETHERMTU; 799 ifp->if_output = ether_output; 800 ifp->if_input = ether_input; 801 if (ifp->if_baudrate == 0) 802 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 803 if ((sdl = ifp->if_sadl) && 804 sdl->sdl_family == AF_LINK) { 805 sdl->sdl_type = IFT_ETHER; 806 sdl->sdl_alen = ifp->if_addrlen; 807 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 808 } 809 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 810 ifp->if_broadcastaddr = etherbroadcastaddr; 811 } 812 813 void 814 ether_ifdetach(struct ifnet *ifp) 815 { 816 struct ethercom *ec = (void *) ifp; 817 struct sockaddr_dl *sdl = ifp->if_sadl; 818 struct ether_multi *enm; 819 int s; 820 821 #if NVLAN > 0 822 if (ec->ec_nvlans) 823 vlan_ifdetach(ifp); 824 #endif 825 826 s = splimp(); 827 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 828 LIST_REMOVE(enm, enm_list); 829 free(enm, M_IFADDR); 830 ec->ec_multicnt--; 831 } 832 splx(s); 833 834 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 835 sdl->sdl_alen = 0; 836 sdl->sdl_type = 0; 837 } 838 839 #if 0 840 /* 841 * This is for reference. We have a table-driven version 842 * of the little-endian crc32 generator, which is faster 843 * than the double-loop. 844 */ 845 u_int32_t 846 ether_crc32_le(const u_int8_t *buf, size_t len) 847 { 848 u_int32_t c, crc, carry; 849 size_t i, j; 850 851 crc = 0xffffffffU; /* initial value */ 852 853 for (i = 0; i < len; i++) { 854 c = buf[i]; 855 for (j = 0; j < 8; j++) { 856 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 857 crc >>= 1; 858 c >>= 1; 859 if (carry) 860 crc = (crc ^ ETHER_CRC_POLY_LE); 861 } 862 } 863 864 return (crc); 865 } 866 #else 867 u_int32_t 868 ether_crc32_le(const u_int8_t *buf, size_t len) 869 { 870 static const u_int32_t crctab[] = { 871 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 872 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 873 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 874 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 875 }; 876 u_int32_t crc; 877 int i; 878 879 crc = 0xffffffffU; /* initial value */ 880 881 for (i = 0; i < len; i++) { 882 crc ^= buf[i]; 883 crc = (crc >> 4) ^ crctab[crc & 0xf]; 884 crc = (crc >> 4) ^ crctab[crc & 0xf]; 885 } 886 887 return (crc); 888 } 889 #endif 890 891 u_int32_t 892 ether_crc32_be(const u_int8_t *buf, size_t len) 893 { 894 u_int32_t c, crc, carry; 895 size_t i, j; 896 897 crc = 0xffffffffU; /* initial value */ 898 899 for (i = 0; i < len; i++) { 900 c = buf[i]; 901 for (j = 0; j < 8; j++) { 902 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 903 crc <<= 1; 904 c >>= 1; 905 if (carry) 906 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 907 } 908 } 909 910 return (crc); 911 } 912 913 #ifdef INET 914 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 915 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 916 #endif 917 #ifdef INET6 918 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 919 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 920 #endif 921 922 /* 923 * Convert a sockaddr into an Ethernet address or range of Ethernet 924 * addresses. 925 */ 926 int 927 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 928 u_int8_t addrhi[ETHER_ADDR_LEN]) 929 { 930 #ifdef INET 931 struct sockaddr_in *sin; 932 #endif /* INET */ 933 #ifdef INET6 934 struct sockaddr_in6 *sin6; 935 #endif /* INET6 */ 936 937 switch (sa->sa_family) { 938 939 case AF_UNSPEC: 940 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 941 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 942 break; 943 944 #ifdef INET 945 case AF_INET: 946 sin = satosin(sa); 947 if (sin->sin_addr.s_addr == INADDR_ANY) { 948 /* 949 * An IP address of INADDR_ANY means listen to 950 * or stop listening to all of the Ethernet 951 * multicast addresses used for IP. 952 * (This is for the sake of IP multicast routers.) 953 */ 954 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 955 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 956 } 957 else { 958 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 959 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 960 } 961 break; 962 #endif 963 #ifdef INET6 964 case AF_INET6: 965 sin6 = satosin6(sa); 966 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 967 /* 968 * An IP6 address of 0 means listen to or stop 969 * listening to all of the Ethernet multicast 970 * address used for IP6. 971 * (This is used for multicast routers.) 972 */ 973 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 974 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 975 } else { 976 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 977 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 978 } 979 break; 980 #endif 981 982 default: 983 return (EAFNOSUPPORT); 984 } 985 return (0); 986 } 987 988 /* 989 * Add an Ethernet multicast address or range of addresses to the list for a 990 * given interface. 991 */ 992 int 993 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 994 { 995 struct ether_multi *enm; 996 u_char addrlo[ETHER_ADDR_LEN]; 997 u_char addrhi[ETHER_ADDR_LEN]; 998 int s = splimp(), error; 999 1000 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1001 if (error != 0) { 1002 splx(s); 1003 return (error); 1004 } 1005 1006 /* 1007 * Verify that we have valid Ethernet multicast addresses. 1008 */ 1009 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1010 splx(s); 1011 return (EINVAL); 1012 } 1013 /* 1014 * See if the address range is already in the list. 1015 */ 1016 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1017 if (enm != NULL) { 1018 /* 1019 * Found it; just increment the reference count. 1020 */ 1021 ++enm->enm_refcount; 1022 splx(s); 1023 return (0); 1024 } 1025 /* 1026 * New address or range; malloc a new multicast record 1027 * and link it into the interface's multicast list. 1028 */ 1029 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1030 if (enm == NULL) { 1031 splx(s); 1032 return (ENOBUFS); 1033 } 1034 bcopy(addrlo, enm->enm_addrlo, 6); 1035 bcopy(addrhi, enm->enm_addrhi, 6); 1036 enm->enm_ec = ec; 1037 enm->enm_refcount = 1; 1038 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1039 ec->ec_multicnt++; 1040 splx(s); 1041 /* 1042 * Return ENETRESET to inform the driver that the list has changed 1043 * and its reception filter should be adjusted accordingly. 1044 */ 1045 return (ENETRESET); 1046 } 1047 1048 /* 1049 * Delete a multicast address record. 1050 */ 1051 int 1052 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1053 { 1054 struct ether_multi *enm; 1055 u_char addrlo[ETHER_ADDR_LEN]; 1056 u_char addrhi[ETHER_ADDR_LEN]; 1057 int s = splimp(), error; 1058 1059 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1060 if (error != 0) { 1061 splx(s); 1062 return (error); 1063 } 1064 1065 /* 1066 * Look ur the address in our list. 1067 */ 1068 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1069 if (enm == NULL) { 1070 splx(s); 1071 return (ENXIO); 1072 } 1073 if (--enm->enm_refcount != 0) { 1074 /* 1075 * Still some claims to this record. 1076 */ 1077 splx(s); 1078 return (0); 1079 } 1080 /* 1081 * No remaining claims to this record; unlink and free it. 1082 */ 1083 LIST_REMOVE(enm, enm_list); 1084 free(enm, M_IFMADDR); 1085 ec->ec_multicnt--; 1086 splx(s); 1087 /* 1088 * Return ENETRESET to inform the driver that the list has changed 1089 * and its reception filter should be adjusted accordingly. 1090 */ 1091 return (ENETRESET); 1092 } 1093 1094 /* 1095 * Common ioctls for Ethernet interfaces. Note, we must be 1096 * called at splnet(). 1097 */ 1098 int 1099 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1100 { 1101 struct ethercom *ec = (void *) ifp; 1102 struct ifreq *ifr = (struct ifreq *)data; 1103 struct ifaddr *ifa = (struct ifaddr *)data; 1104 int error = 0; 1105 1106 switch (cmd) { 1107 case SIOCSIFADDR: 1108 ifp->if_flags |= IFF_UP; 1109 switch (ifa->ifa_addr->sa_family) { 1110 #ifdef INET 1111 case AF_INET: 1112 if ((error = (*ifp->if_init)(ifp)) != 0) 1113 break; 1114 arp_ifinit(ifp, ifa); 1115 break; 1116 #endif /* INET */ 1117 #ifdef NS 1118 case AF_NS: 1119 { 1120 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1121 1122 if (ns_nullhost(*ina)) 1123 ina->x_host = *(union ns_host *) 1124 LLADDR(ifp->if_sadl); 1125 else 1126 memcpy(LLADDR(ifp->if_sadl), 1127 ina->x_host.c_host, ifp->if_addrlen); 1128 /* Set new address. */ 1129 error = (*ifp->if_init)(ifp); 1130 break; 1131 } 1132 #endif /* NS */ 1133 default: 1134 error = (*ifp->if_init)(ifp); 1135 break; 1136 } 1137 break; 1138 1139 case SIOCGIFADDR: 1140 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1141 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1142 break; 1143 1144 case SIOCSIFMTU: 1145 if (ifr->ifr_mtu > ETHERMTU) 1146 error = EINVAL; 1147 else 1148 ifp->if_mtu = ifr->ifr_mtu; 1149 break; 1150 1151 case SIOCSIFFLAGS: 1152 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1153 /* 1154 * If interface is marked down and it is running, 1155 * then stop and disable it. 1156 */ 1157 (*ifp->if_stop)(ifp, 1); 1158 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1159 /* 1160 * If interface is marked up and it is stopped, then 1161 * start it. 1162 */ 1163 error = (*ifp->if_init)(ifp); 1164 } else if ((ifp->if_flags & IFF_UP) != 0) { 1165 /* 1166 * Reset the interface to pick up changes in any other 1167 * flags that affect the hardware state. 1168 */ 1169 error = (*ifp->if_init)(ifp); 1170 } 1171 break; 1172 1173 case SIOCADDMULTI: 1174 case SIOCDELMULTI: 1175 error = (cmd == SIOCADDMULTI) ? 1176 ether_addmulti(ifr, ec) : 1177 ether_delmulti(ifr, ec); 1178 break; 1179 1180 default: 1181 error = ENOTTY; 1182 } 1183 1184 return (error); 1185 } 1186
Indexes created Mon Sep 22 13:09:51 GMT 2025