if_ethersubr.c revision 1.67
1 /* $NetBSD: if_ethersubr.c,v 1.67 2000/10/15 15:39:11 itojun 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\n", ifp->if_xname); 520 m_freem(m); 521 return; 522 } 523 524 ifp->if_lastchange = time; 525 ifp->if_ibytes += m->m_pkthdr.len; 526 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 527 if (memcmp(etherbroadcastaddr, 528 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 529 m->m_flags |= M_BCAST; 530 else 531 m->m_flags |= M_MCAST; 532 ifp->if_imcasts++; 533 } else if ((ifp->if_flags & IFF_PROMISC) != 0 && 534 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 535 ETHER_ADDR_LEN) != 0) { 536 m_freem(m); 537 return; 538 } 539 540 /* 541 * Handle protocols that expect to have the Ethernet header 542 * (and possibly FCS) intact. 543 */ 544 switch (etype) { 545 #if NVLAN > 0 546 case ETHERTYPE_VLAN: 547 /* 548 * vlan_input() will either recursively call ether_input() 549 * or drop the packet. 550 */ 551 if (((struct ethercom *)ifp)->ec_nvlans != 0) 552 vlan_input(ifp, m); 553 else 554 m_freem(m); 555 return; 556 #endif /* NVLAN > 0 */ 557 default: 558 /* Nothing. */ 559 } 560 561 /* Strip off the Ethernet header. */ 562 m_adj(m, sizeof(struct ether_header)); 563 564 /* If the CRC is still on the packet, trim it off. */ 565 if (m->m_flags & M_HASFCS) 566 m_adj(m, -ETHER_CRC_LEN); 567 568 switch (etype) { 569 #ifdef INET 570 case ETHERTYPE_IP: 571 #ifdef GATEWAY 572 if (ipflow_fastforward(m)) 573 return; 574 #endif 575 schednetisr(NETISR_IP); 576 inq = &ipintrq; 577 break; 578 579 case ETHERTYPE_ARP: 580 schednetisr(NETISR_ARP); 581 inq = &arpintrq; 582 break; 583 584 case ETHERTYPE_REVARP: 585 revarpinput(m); /* XXX queue? */ 586 return; 587 #endif 588 #ifdef INET6 589 case ETHERTYPE_IPV6: 590 schednetisr(NETISR_IPV6); 591 inq = &ip6intrq; 592 break; 593 #endif 594 #ifdef NS 595 case ETHERTYPE_NS: 596 schednetisr(NETISR_NS); 597 inq = &nsintrq; 598 break; 599 600 #endif 601 #ifdef IPX 602 case ETHERTYPE_IPX: 603 schednetisr(NETISR_IPX); 604 inq = &ipxintrq; 605 break; 606 #endif 607 #ifdef NETATALK 608 case ETHERTYPE_ATALK: 609 schednetisr(NETISR_ATALK); 610 inq = &atintrq1; 611 break; 612 case ETHERTYPE_AARP: 613 /* probably this should be done with a NETISR as well */ 614 aarpinput(ifp, m); /* XXX */ 615 return; 616 #endif /* NETATALK */ 617 default: 618 #if defined (ISO) || defined (LLC) || defined (NETATALK) 619 if (etype > ETHERMTU) 620 goto dropanyway; 621 l = mtod(m, struct llc *); 622 switch (l->llc_dsap) { 623 #ifdef NETATALK 624 case LLC_SNAP_LSAP: 625 switch (l->llc_control) { 626 case LLC_UI: 627 if (l->llc_ssap != LLC_SNAP_LSAP) { 628 goto dropanyway; 629 } 630 631 if (Bcmp(&(l->llc_snap_org_code)[0], 632 at_org_code, sizeof(at_org_code)) == 0 && 633 ntohs(l->llc_snap_ether_type) == 634 ETHERTYPE_ATALK) { 635 inq = &atintrq2; 636 m_adj(m, sizeof(struct llc)); 637 schednetisr(NETISR_ATALK); 638 break; 639 } 640 641 if (Bcmp(&(l->llc_snap_org_code)[0], 642 aarp_org_code, 643 sizeof(aarp_org_code)) == 0 && 644 ntohs(l->llc_snap_ether_type) == 645 ETHERTYPE_AARP) { 646 m_adj( m, sizeof(struct llc)); 647 aarpinput(ifp, m); /* XXX */ 648 return; 649 } 650 651 default: 652 goto dropanyway; 653 } 654 break; 655 #endif /* NETATALK */ 656 #ifdef ISO 657 case LLC_ISO_LSAP: 658 switch (l->llc_control) { 659 case LLC_UI: 660 /* LLC_UI_P forbidden in class 1 service */ 661 if ((l->llc_dsap == LLC_ISO_LSAP) && 662 (l->llc_ssap == LLC_ISO_LSAP)) { 663 /* LSAP for ISO */ 664 if (m->m_pkthdr.len > etype) 665 m_adj(m, etype - m->m_pkthdr.len); 666 m->m_data += 3; /* XXX */ 667 m->m_len -= 3; /* XXX */ 668 m->m_pkthdr.len -= 3; /* XXX */ 669 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 670 if (m == 0) 671 return; 672 *mtod(m, struct ether_header *) = *eh; 673 #ifdef ARGO_DEBUG 674 if (argo_debug[D_ETHER]) 675 printf("clnp packet"); 676 #endif 677 schednetisr(NETISR_ISO); 678 inq = &clnlintrq; 679 break; 680 } 681 goto dropanyway; 682 683 case LLC_XID: 684 case LLC_XID_P: 685 if(m->m_len < 6) 686 goto dropanyway; 687 l->llc_window = 0; 688 l->llc_fid = 9; 689 l->llc_class = 1; 690 l->llc_dsap = l->llc_ssap = 0; 691 /* Fall through to */ 692 case LLC_TEST: 693 case LLC_TEST_P: 694 { 695 struct sockaddr sa; 696 struct ether_header *eh2; 697 int i; 698 u_char c = l->llc_dsap; 699 700 l->llc_dsap = l->llc_ssap; 701 l->llc_ssap = c; 702 if (m->m_flags & (M_BCAST | M_MCAST)) 703 bcopy(LLADDR(ifp->if_sadl), 704 (caddr_t)eh->ether_dhost, 6); 705 sa.sa_family = AF_UNSPEC; 706 sa.sa_len = sizeof(sa); 707 eh2 = (struct ether_header *)sa.sa_data; 708 for (i = 0; i < 6; i++) { 709 eh2->ether_shost[i] = c = 710 eh->ether_dhost[i]; 711 eh2->ether_dhost[i] = 712 eh->ether_dhost[i] = 713 eh->ether_shost[i]; 714 eh->ether_shost[i] = c; 715 } 716 ifp->if_output(ifp, m, &sa, NULL); 717 return; 718 } 719 default: 720 m_freem(m); 721 return; 722 } 723 break; 724 #endif /* ISO */ 725 #ifdef LLC 726 case LLC_X25_LSAP: 727 { 728 if (m->m_pkthdr.len > etype) 729 m_adj(m, etype - m->m_pkthdr.len); 730 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 731 if (m == 0) 732 return; 733 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 734 eh->ether_dhost, LLC_X25_LSAP, 6, 735 mtod(m, struct sdl_hdr *))) 736 panic("ETHER cons addr failure"); 737 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 738 #ifdef LLC_DEBUG 739 printf("llc packet\n"); 740 #endif /* LLC_DEBUG */ 741 schednetisr(NETISR_CCITT); 742 inq = &llcintrq; 743 break; 744 } 745 #endif /* LLC */ 746 dropanyway: 747 default: 748 m_freem(m); 749 return; 750 } 751 #else /* ISO || LLC || NETATALK*/ 752 m_freem(m); 753 return; 754 #endif /* ISO || LLC || NETATALK*/ 755 } 756 757 s = splimp(); 758 if (IF_QFULL(inq)) { 759 IF_DROP(inq); 760 m_freem(m); 761 } else 762 IF_ENQUEUE(inq, m); 763 splx(s); 764 } 765 766 /* 767 * Convert Ethernet address to printable (loggable) representation. 768 */ 769 static char digits[] = "0123456789abcdef"; 770 char * 771 ether_sprintf(const u_char *ap) 772 { 773 static char etherbuf[18]; 774 char *cp = etherbuf; 775 int i; 776 777 for (i = 0; i < 6; i++) { 778 *cp++ = digits[*ap >> 4]; 779 *cp++ = digits[*ap++ & 0xf]; 780 *cp++ = ':'; 781 } 782 *--cp = 0; 783 return (etherbuf); 784 } 785 786 /* 787 * Perform common duties while attaching to interface list 788 */ 789 void 790 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 791 { 792 struct sockaddr_dl *sdl; 793 794 ifp->if_type = IFT_ETHER; 795 ifp->if_addrlen = 6; 796 ifp->if_hdrlen = 14; 797 ifp->if_mtu = ETHERMTU; 798 ifp->if_output = ether_output; 799 ifp->if_input = ether_input; 800 if (ifp->if_baudrate == 0) 801 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 802 if ((sdl = ifp->if_sadl) && 803 sdl->sdl_family == AF_LINK) { 804 sdl->sdl_type = IFT_ETHER; 805 sdl->sdl_alen = ifp->if_addrlen; 806 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 807 } 808 LIST_INIT(&((struct ethercom *)ifp)->ec_multiaddrs); 809 ifp->if_broadcastaddr = etherbroadcastaddr; 810 } 811 812 void 813 ether_ifdetach(struct ifnet *ifp) 814 { 815 struct ethercom *ec = (void *) ifp; 816 struct sockaddr_dl *sdl = ifp->if_sadl; 817 struct ether_multi *enm; 818 int s; 819 820 #if NVLAN > 0 821 if (ec->ec_nvlans) 822 vlan_ifdetach(ifp); 823 #endif 824 825 s = splimp(); 826 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 827 LIST_REMOVE(enm, enm_list); 828 free(enm, M_IFADDR); 829 ec->ec_multicnt--; 830 } 831 splx(s); 832 833 memset(LLADDR(sdl), 0, ETHER_ADDR_LEN); 834 sdl->sdl_alen = 0; 835 sdl->sdl_type = 0; 836 } 837 838 #if 0 839 /* 840 * This is for reference. We have a table-driven version 841 * of the little-endian crc32 generator, which is faster 842 * than the double-loop. 843 */ 844 u_int32_t 845 ether_crc32_le(const u_int8_t *buf, size_t len) 846 { 847 u_int32_t c, crc, carry; 848 size_t i, j; 849 850 crc = 0xffffffffU; /* initial value */ 851 852 for (i = 0; i < len; i++) { 853 c = buf[i]; 854 for (j = 0; j < 8; j++) { 855 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 856 crc >>= 1; 857 c >>= 1; 858 if (carry) 859 crc = (crc ^ ETHER_CRC_POLY_LE); 860 } 861 } 862 863 return (crc); 864 } 865 #else 866 u_int32_t 867 ether_crc32_le(const u_int8_t *buf, size_t len) 868 { 869 static const u_int32_t crctab[] = { 870 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 871 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 872 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 873 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 874 }; 875 u_int32_t crc; 876 int i; 877 878 crc = 0xffffffffU; /* initial value */ 879 880 for (i = 0; i < len; i++) { 881 crc ^= buf[i]; 882 crc = (crc >> 4) ^ crctab[crc & 0xf]; 883 crc = (crc >> 4) ^ crctab[crc & 0xf]; 884 } 885 886 return (crc); 887 } 888 #endif 889 890 u_int32_t 891 ether_crc32_be(const u_int8_t *buf, size_t len) 892 { 893 u_int32_t c, crc, carry; 894 size_t i, j; 895 896 crc = 0xffffffffU; /* initial value */ 897 898 for (i = 0; i < len; i++) { 899 c = buf[i]; 900 for (j = 0; j < 8; j++) { 901 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 902 crc <<= 1; 903 c >>= 1; 904 if (carry) 905 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 906 } 907 } 908 909 return (crc); 910 } 911 912 #ifdef INET 913 u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 914 u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 915 #endif 916 #ifdef INET6 917 u_char ether_ip6multicast_min[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 918 u_char ether_ip6multicast_max[6] = { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 919 #endif 920 921 /* 922 * Convert a sockaddr into an Ethernet address or range of Ethernet 923 * addresses. 924 */ 925 int 926 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 927 u_int8_t addrhi[ETHER_ADDR_LEN]) 928 { 929 #ifdef INET 930 struct sockaddr_in *sin; 931 #endif /* INET */ 932 #ifdef INET6 933 struct sockaddr_in6 *sin6; 934 #endif /* INET6 */ 935 936 switch (sa->sa_family) { 937 938 case AF_UNSPEC: 939 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 940 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 941 break; 942 943 #ifdef INET 944 case AF_INET: 945 sin = satosin(sa); 946 if (sin->sin_addr.s_addr == INADDR_ANY) { 947 /* 948 * An IP address of INADDR_ANY means listen to 949 * or stop listening to all of the Ethernet 950 * multicast addresses used for IP. 951 * (This is for the sake of IP multicast routers.) 952 */ 953 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 954 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 955 } 956 else { 957 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 958 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 959 } 960 break; 961 #endif 962 #ifdef INET6 963 case AF_INET6: 964 sin6 = satosin6(sa); 965 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 966 /* 967 * An IP6 address of 0 means listen to or stop 968 * listening to all of the Ethernet multicast 969 * address used for IP6. 970 * (This is used for multicast routers.) 971 */ 972 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 973 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 974 } else { 975 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 976 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 977 } 978 break; 979 #endif 980 981 default: 982 return (EAFNOSUPPORT); 983 } 984 return (0); 985 } 986 987 /* 988 * Add an Ethernet multicast address or range of addresses to the list for a 989 * given interface. 990 */ 991 int 992 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 993 { 994 struct ether_multi *enm; 995 u_char addrlo[ETHER_ADDR_LEN]; 996 u_char addrhi[ETHER_ADDR_LEN]; 997 int s = splimp(), error; 998 999 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1000 if (error != 0) { 1001 splx(s); 1002 return (error); 1003 } 1004 1005 /* 1006 * Verify that we have valid Ethernet multicast addresses. 1007 */ 1008 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1009 splx(s); 1010 return (EINVAL); 1011 } 1012 /* 1013 * See if the address range is already in the list. 1014 */ 1015 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1016 if (enm != NULL) { 1017 /* 1018 * Found it; just increment the reference count. 1019 */ 1020 ++enm->enm_refcount; 1021 splx(s); 1022 return (0); 1023 } 1024 /* 1025 * New address or range; malloc a new multicast record 1026 * and link it into the interface's multicast list. 1027 */ 1028 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1029 if (enm == NULL) { 1030 splx(s); 1031 return (ENOBUFS); 1032 } 1033 bcopy(addrlo, enm->enm_addrlo, 6); 1034 bcopy(addrhi, enm->enm_addrhi, 6); 1035 enm->enm_ec = ec; 1036 enm->enm_refcount = 1; 1037 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1038 ec->ec_multicnt++; 1039 splx(s); 1040 /* 1041 * Return ENETRESET to inform the driver that the list has changed 1042 * and its reception filter should be adjusted accordingly. 1043 */ 1044 return (ENETRESET); 1045 } 1046 1047 /* 1048 * Delete a multicast address record. 1049 */ 1050 int 1051 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1052 { 1053 struct ether_multi *enm; 1054 u_char addrlo[ETHER_ADDR_LEN]; 1055 u_char addrhi[ETHER_ADDR_LEN]; 1056 int s = splimp(), error; 1057 1058 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1059 if (error != 0) { 1060 splx(s); 1061 return (error); 1062 } 1063 1064 /* 1065 * Look ur the address in our list. 1066 */ 1067 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1068 if (enm == NULL) { 1069 splx(s); 1070 return (ENXIO); 1071 } 1072 if (--enm->enm_refcount != 0) { 1073 /* 1074 * Still some claims to this record. 1075 */ 1076 splx(s); 1077 return (0); 1078 } 1079 /* 1080 * No remaining claims to this record; unlink and free it. 1081 */ 1082 LIST_REMOVE(enm, enm_list); 1083 free(enm, M_IFMADDR); 1084 ec->ec_multicnt--; 1085 splx(s); 1086 /* 1087 * Return ENETRESET to inform the driver that the list has changed 1088 * and its reception filter should be adjusted accordingly. 1089 */ 1090 return (ENETRESET); 1091 } 1092 1093 /* 1094 * Common ioctls for Ethernet interfaces. Note, we must be 1095 * called at splnet(). 1096 */ 1097 int 1098 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1099 { 1100 struct ethercom *ec = (void *) ifp; 1101 struct ifreq *ifr = (struct ifreq *)data; 1102 struct ifaddr *ifa = (struct ifaddr *)data; 1103 int error = 0; 1104 1105 switch (cmd) { 1106 case SIOCSIFADDR: 1107 ifp->if_flags |= IFF_UP; 1108 switch (ifa->ifa_addr->sa_family) { 1109 #ifdef INET 1110 case AF_INET: 1111 if ((error = (*ifp->if_init)(ifp)) != 0) 1112 break; 1113 arp_ifinit(ifp, ifa); 1114 break; 1115 #endif /* INET */ 1116 #ifdef NS 1117 case AF_NS: 1118 { 1119 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1120 1121 if (ns_nullhost(*ina)) 1122 ina->x_host = *(union ns_host *) 1123 LLADDR(ifp->if_sadl); 1124 else 1125 memcpy(LLADDR(ifp->if_sadl), 1126 ina->x_host.c_host, ifp->if_addrlen); 1127 /* Set new address. */ 1128 error = (*ifp->if_init)(ifp); 1129 break; 1130 } 1131 #endif /* NS */ 1132 default: 1133 error = (*ifp->if_init)(ifp); 1134 break; 1135 } 1136 break; 1137 1138 case SIOCGIFADDR: 1139 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1140 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1141 break; 1142 1143 case SIOCSIFMTU: 1144 if (ifr->ifr_mtu > ETHERMTU) 1145 error = EINVAL; 1146 else 1147 ifp->if_mtu = ifr->ifr_mtu; 1148 break; 1149 1150 case SIOCSIFFLAGS: 1151 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1152 /* 1153 * If interface is marked down and it is running, 1154 * then stop and disable it. 1155 */ 1156 (*ifp->if_stop)(ifp, 1); 1157 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1158 /* 1159 * If interface is marked up and it is stopped, then 1160 * start it. 1161 */ 1162 error = (*ifp->if_init)(ifp); 1163 } else if ((ifp->if_flags & IFF_UP) != 0) { 1164 /* 1165 * Reset the interface to pick up changes in any other 1166 * flags that affect the hardware state. 1167 */ 1168 error = (*ifp->if_init)(ifp); 1169 } 1170 break; 1171 1172 case SIOCADDMULTI: 1173 case SIOCDELMULTI: 1174 error = (cmd == SIOCADDMULTI) ? 1175 ether_addmulti(ifr, ec) : 1176 ether_delmulti(ifr, ec); 1177 break; 1178 1179 default: 1180 error = ENOTTY; 1181 } 1182 1183 return (error); 1184 } 1185
Indexes created Mon Sep 22 13:09:51 GMT 2025