if_ethersubr.c revision 1.131
1 /* $NetBSD: if_ethersubr.c,v 1.131 2006/05/12 01:20:33 mrg 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. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.131 2006/05/12 01:20:33 mrg Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_atalk.h" 68 #include "opt_ccitt.h" 69 #include "opt_llc.h" 70 #include "opt_iso.h" 71 #include "opt_ipx.h" 72 #include "opt_mbuftrace.h" 73 #include "opt_ns.h" 74 #include "opt_gateway.h" 75 #include "opt_pfil_hooks.h" 76 #include "vlan.h" 77 #include "pppoe.h" 78 #include "bridge.h" 79 #include "bpfilter.h" 80 #include "arp.h" 81 #include "agr.h" 82 83 #include <sys/param.h> 84 #include <sys/systm.h> 85 #include <sys/kernel.h> 86 #include <sys/callout.h> 87 #include <sys/malloc.h> 88 #include <sys/mbuf.h> 89 #include <sys/protosw.h> 90 #include <sys/socket.h> 91 #include <sys/ioctl.h> 92 #include <sys/errno.h> 93 #include <sys/syslog.h> 94 95 #include <machine/cpu.h> 96 97 #include <net/if.h> 98 #include <net/netisr.h> 99 #include <net/route.h> 100 #include <net/if_llc.h> 101 #include <net/if_dl.h> 102 #include <net/if_types.h> 103 104 #if NARP == 0 105 /* 106 * XXX there should really be a way to issue this warning from within config(8) 107 */ 108 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. 109 #endif 110 111 #if NBPFILTER > 0 112 #include <net/bpf.h> 113 #endif 114 115 #include <net/if_ether.h> 116 #if NVLAN > 0 117 #include <net/if_vlanvar.h> 118 #endif 119 120 #if NPPPOE > 0 121 #include <net/if_pppoe.h> 122 #endif 123 124 #if NAGR > 0 125 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 126 #include <net/agr/ieee8023ad.h> 127 #include <net/agr/if_agrvar.h> 128 #endif 129 130 #if NBRIDGE > 0 131 #include <net/if_bridgevar.h> 132 #endif 133 134 #include <netinet/in.h> 135 #ifdef INET 136 #include <netinet/in_var.h> 137 #endif 138 #include <netinet/if_inarp.h> 139 140 #ifdef INET6 141 #ifndef INET 142 #include <netinet/in.h> 143 #endif 144 #include <netinet6/in6_var.h> 145 #include <netinet6/nd6.h> 146 #endif 147 148 #ifdef NS 149 #include <netns/ns.h> 150 #include <netns/ns_if.h> 151 #endif 152 153 #ifdef IPX 154 #include <netipx/ipx.h> 155 #include <netipx/ipx_if.h> 156 #endif 157 158 #ifdef ISO 159 #include <netiso/argo_debug.h> 160 #include <netiso/iso.h> 161 #include <netiso/iso_var.h> 162 #include <netiso/iso_snpac.h> 163 #endif 164 165 #ifdef LLC 166 #include <netccitt/dll.h> 167 #include <netccitt/llc_var.h> 168 #endif 169 170 #if defined(LLC) && defined(CCITT) 171 extern struct ifqueue pkintrq; 172 #endif 173 174 #ifdef NETATALK 175 #include <netatalk/at.h> 176 #include <netatalk/at_var.h> 177 #include <netatalk/at_extern.h> 178 179 #define llc_snap_org_code llc_un.type_snap.org_code 180 #define llc_snap_ether_type llc_un.type_snap.ether_type 181 182 extern u_char at_org_code[3]; 183 extern u_char aarp_org_code[3]; 184 #endif /* NETATALK */ 185 186 static struct timeval bigpktppslim_last; 187 static int bigpktppslim = 2; /* XXX */ 188 static int bigpktpps_count; 189 190 191 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 192 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 193 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 194 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 195 #define senderr(e) { error = (e); goto bad;} 196 197 #define SIN(x) ((struct sockaddr_in *)x) 198 199 static int ether_output(struct ifnet *, struct mbuf *, 200 struct sockaddr *, struct rtentry *); 201 static void ether_input(struct ifnet *, struct mbuf *); 202 203 /* 204 * Ethernet output routine. 205 * Encapsulate a packet of type family for the local net. 206 * Assumes that ifp is actually pointer to ethercom structure. 207 */ 208 static int 209 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 210 struct rtentry *rt0) 211 { 212 u_int16_t etype = 0; 213 int error = 0, hdrcmplt = 0; 214 u_char esrc[6], edst[6]; 215 struct mbuf *m = m0; 216 struct rtentry *rt; 217 struct mbuf *mcopy = (struct mbuf *)0; 218 struct ether_header *eh; 219 ALTQ_DECL(struct altq_pktattr pktattr;) 220 #ifdef INET 221 struct arphdr *ah; 222 #endif /* INET */ 223 #ifdef NETATALK 224 struct at_ifaddr *aa; 225 #endif /* NETATALK */ 226 227 #ifdef MBUFTRACE 228 m_claimm(m, ifp->if_mowner); 229 #endif 230 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 231 senderr(ENETDOWN); 232 if ((rt = rt0) != NULL) { 233 if ((rt->rt_flags & RTF_UP) == 0) { 234 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 235 rt->rt_refcnt--; 236 if (rt->rt_ifp != ifp) 237 return (*rt->rt_ifp->if_output) 238 (ifp, m0, dst, rt); 239 } else 240 senderr(EHOSTUNREACH); 241 } 242 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 243 if (rt->rt_gwroute == 0) 244 goto lookup; 245 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 246 rtfree(rt); rt = rt0; 247 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 248 if ((rt = rt->rt_gwroute) == 0) 249 senderr(EHOSTUNREACH); 250 /* the "G" test below also prevents rt == rt0 */ 251 if ((rt->rt_flags & RTF_GATEWAY) || 252 (rt->rt_ifp != ifp)) { 253 rt->rt_refcnt--; 254 rt0->rt_gwroute = 0; 255 senderr(EHOSTUNREACH); 256 } 257 } 258 } 259 if (rt->rt_flags & RTF_REJECT) 260 if (rt->rt_rmx.rmx_expire == 0 || 261 (u_long) time.tv_sec < rt->rt_rmx.rmx_expire) 262 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 263 } 264 265 switch (dst->sa_family) { 266 267 #ifdef INET 268 case AF_INET: 269 if (m->m_flags & M_BCAST) 270 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 271 272 else if (m->m_flags & M_MCAST) { 273 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 274 (caddr_t)edst) 275 276 } else if (!arpresolve(ifp, rt, m, dst, edst)) 277 return (0); /* if not yet resolved */ 278 /* If broadcasting on a simplex interface, loopback a copy */ 279 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 280 mcopy = m_copy(m, 0, (int)M_COPYALL); 281 etype = htons(ETHERTYPE_IP); 282 break; 283 284 case AF_ARP: 285 ah = mtod(m, struct arphdr *); 286 if (m->m_flags & M_BCAST) 287 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 288 else { 289 caddr_t tha = ar_tha(ah); 290 291 KASSERT(tha); 292 bcopy(tha, (caddr_t)edst, sizeof(edst)); 293 } 294 295 ah->ar_hrd = htons(ARPHRD_ETHER); 296 297 switch (ntohs(ah->ar_op)) { 298 case ARPOP_REVREQUEST: 299 case ARPOP_REVREPLY: 300 etype = htons(ETHERTYPE_REVARP); 301 break; 302 303 case ARPOP_REQUEST: 304 case ARPOP_REPLY: 305 default: 306 etype = htons(ETHERTYPE_ARP); 307 } 308 309 break; 310 #endif 311 #ifdef INET6 312 case AF_INET6: 313 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 314 /* something bad happened */ 315 return (0); 316 } 317 etype = htons(ETHERTYPE_IPV6); 318 break; 319 #endif 320 #ifdef NETATALK 321 case AF_APPLETALK: 322 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 323 #ifdef NETATALKDEBUG 324 printf("aarpresolv failed\n"); 325 #endif /* NETATALKDEBUG */ 326 return (0); 327 } 328 /* 329 * ifaddr is the first thing in at_ifaddr 330 */ 331 aa = (struct at_ifaddr *) at_ifawithnet( 332 (struct sockaddr_at *)dst, ifp); 333 if (aa == NULL) 334 goto bad; 335 336 /* 337 * In the phase 2 case, we need to prepend an mbuf for the 338 * llc header. Since we must preserve the value of m, 339 * which is passed to us by value, we m_copy() the first 340 * mbuf, and use it for our llc header. 341 */ 342 if (aa->aa_flags & AFA_PHASE2) { 343 struct llc llc; 344 345 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 346 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 347 llc.llc_control = LLC_UI; 348 bcopy(at_org_code, llc.llc_snap_org_code, 349 sizeof(llc.llc_snap_org_code)); 350 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 351 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 352 } else { 353 etype = htons(ETHERTYPE_ATALK); 354 } 355 break; 356 #endif /* NETATALK */ 357 #ifdef NS 358 case AF_NS: 359 etype = htons(ETHERTYPE_NS); 360 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 361 (caddr_t)edst, sizeof (edst)); 362 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 363 return (looutput(ifp, m, dst, rt)); 364 /* If broadcasting on a simplex interface, loopback a copy */ 365 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 366 mcopy = m_copy(m, 0, (int)M_COPYALL); 367 break; 368 #endif 369 #ifdef IPX 370 case AF_IPX: 371 etype = htons(ETHERTYPE_IPX); 372 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 373 (caddr_t)edst, sizeof (edst)); 374 /* If broadcasting on a simplex interface, loopback a copy */ 375 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 376 mcopy = m_copy(m, 0, (int)M_COPYALL); 377 break; 378 #endif 379 #ifdef ISO 380 case AF_ISO: { 381 int snpalen; 382 struct llc *l; 383 struct sockaddr_dl *sdl; 384 385 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 386 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 387 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 388 } else { 389 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 390 (char *)edst, &snpalen); 391 if (error) 392 goto bad; /* Not Resolved */ 393 } 394 /* If broadcasting on a simplex interface, loopback a copy */ 395 if (*edst & 1) 396 m->m_flags |= (M_BCAST|M_MCAST); 397 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 398 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 399 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 400 if (mcopy) { 401 eh = mtod(mcopy, struct ether_header *); 402 bcopy((caddr_t)edst, 403 (caddr_t)eh->ether_dhost, sizeof (edst)); 404 bcopy(LLADDR(ifp->if_sadl), 405 (caddr_t)eh->ether_shost, sizeof (edst)); 406 } 407 } 408 M_PREPEND(m, 3, M_DONTWAIT); 409 if (m == NULL) 410 return (0); 411 l = mtod(m, struct llc *); 412 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 413 l->llc_control = LLC_UI; 414 #ifdef ARGO_DEBUG 415 if (argo_debug[D_ETHER]) { 416 int i; 417 printf("unoutput: sending pkt to: "); 418 for (i=0; i<6; i++) 419 printf("%x ", edst[i] & 0xff); 420 printf("\n"); 421 } 422 #endif 423 } break; 424 #endif /* ISO */ 425 #ifdef LLC 426 /* case AF_NSAP: */ 427 case AF_CCITT: { 428 struct sockaddr_dl *sdl = rt ? 429 (struct sockaddr_dl *) rt -> rt_gateway : NULL; 430 431 if (sdl && sdl->sdl_family == AF_LINK 432 && sdl->sdl_alen > 0) { 433 bcopy(LLADDR(sdl), (char *)edst, 434 sizeof(edst)); 435 } else goto bad; /* Not a link interface ? Funny ... */ 436 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 437 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 438 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 439 if (mcopy) { 440 eh = mtod(mcopy, struct ether_header *); 441 bcopy((caddr_t)edst, 442 (caddr_t)eh->ether_dhost, sizeof (edst)); 443 bcopy(LLADDR(ifp->if_sadl), 444 (caddr_t)eh->ether_shost, sizeof (edst)); 445 } 446 } 447 #ifdef LLC_DEBUG 448 { 449 int i; 450 struct llc *l = mtod(m, struct llc *); 451 452 printf("ether_output: sending LLC2 pkt to: "); 453 for (i=0; i<6; i++) 454 printf("%x ", edst[i] & 0xff); 455 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 456 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 457 l->llc_control & 0xff); 458 459 } 460 #endif /* LLC_DEBUG */ 461 } break; 462 #endif /* LLC */ 463 464 case pseudo_AF_HDRCMPLT: 465 hdrcmplt = 1; 466 eh = (struct ether_header *)dst->sa_data; 467 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 468 /* FALLTHROUGH */ 469 470 case AF_UNSPEC: 471 eh = (struct ether_header *)dst->sa_data; 472 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 473 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 474 etype = eh->ether_type; 475 break; 476 477 default: 478 printf("%s: can't handle af%d\n", ifp->if_xname, 479 dst->sa_family); 480 senderr(EAFNOSUPPORT); 481 } 482 483 if (mcopy) 484 (void) looutput(ifp, mcopy, dst, rt); 485 486 /* If no ether type is set, this must be a 802.2 formatted packet. 487 */ 488 if (etype == 0) 489 etype = htons(m->m_pkthdr.len); 490 /* 491 * Add local net header. If no space in first mbuf, 492 * allocate another. 493 */ 494 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 495 if (m == 0) 496 senderr(ENOBUFS); 497 eh = mtod(m, struct ether_header *); 498 /* Note: etype is already in network byte order. */ 499 #ifdef __NO_STRICT_ALIGNMENT 500 eh->ether_type = etype; 501 #else 502 { 503 uint8_t *dstp = (uint8_t *) &eh->ether_type; 504 #if BYTE_ORDER == BIG_ENDIAN 505 dstp[0] = etype >> 8; 506 dstp[1] = etype; 507 #else 508 dstp[0] = etype; 509 dstp[1] = etype >> 8; 510 #endif /* BYTE_ORDER == BIG_ENDIAN */ 511 } 512 #endif /* __NO_STRICT_ALIGNMENT */ 513 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 514 if (hdrcmplt) 515 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 516 sizeof(eh->ether_shost)); 517 else 518 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 519 sizeof(eh->ether_shost)); 520 521 #ifdef PFIL_HOOKS 522 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 523 return (error); 524 if (m == NULL) 525 return (0); 526 #endif 527 528 #if NBRIDGE > 0 529 /* 530 * Bridges require special output handling. 531 */ 532 if (ifp->if_bridge) 533 return (bridge_output(ifp, m, NULL, NULL)); 534 #endif 535 536 #ifdef ALTQ 537 /* 538 * If ALTQ is enabled on the parent interface, do 539 * classification; the queueing discipline might not 540 * require classification, but might require the 541 * address family/header pointer in the pktattr. 542 */ 543 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 544 altq_etherclassify(&ifp->if_snd, m, &pktattr); 545 #endif 546 547 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 548 549 bad: 550 if (m) 551 m_freem(m); 552 return (error); 553 } 554 555 #ifdef ALTQ 556 /* 557 * This routine is a slight hack to allow a packet to be classified 558 * if the Ethernet headers are present. It will go away when ALTQ's 559 * classification engine understands link headers. 560 */ 561 void 562 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 563 struct altq_pktattr *pktattr) 564 { 565 struct ether_header *eh; 566 u_int16_t ether_type; 567 int hlen, af, hdrsize; 568 caddr_t hdr; 569 570 hlen = ETHER_HDR_LEN; 571 eh = mtod(m, struct ether_header *); 572 573 ether_type = htons(eh->ether_type); 574 575 if (ether_type < ETHERMTU) { 576 /* LLC/SNAP */ 577 struct llc *llc = (struct llc *)(eh + 1); 578 hlen += 8; 579 580 if (m->m_len < hlen || 581 llc->llc_dsap != LLC_SNAP_LSAP || 582 llc->llc_ssap != LLC_SNAP_LSAP || 583 llc->llc_control != LLC_UI) { 584 /* Not SNAP. */ 585 goto bad; 586 } 587 588 ether_type = htons(llc->llc_un.type_snap.ether_type); 589 } 590 591 switch (ether_type) { 592 case ETHERTYPE_IP: 593 af = AF_INET; 594 hdrsize = 20; /* sizeof(struct ip) */ 595 break; 596 597 case ETHERTYPE_IPV6: 598 af = AF_INET6; 599 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 600 break; 601 602 default: 603 af = AF_UNSPEC; 604 hdrsize = 0; 605 break; 606 } 607 608 while (m->m_len <= hlen) { 609 hlen -= m->m_len; 610 m = m->m_next; 611 } 612 if (m->m_len < (hlen + hdrsize)) { 613 /* 614 * protocol header not in a single mbuf. 615 * We can't cope with this situation right 616 * now (but it shouldn't ever happen, really, anyhow). 617 */ 618 #ifdef DEBUG 619 printf("altq_etherclassify: headers span multiple mbufs: " 620 "%d < %d\n", m->m_len, (hlen + hdrsize)); 621 #endif 622 goto bad; 623 } 624 625 m->m_data += hlen; 626 m->m_len -= hlen; 627 628 hdr = mtod(m, caddr_t); 629 630 if (ALTQ_NEEDS_CLASSIFY(ifq)) 631 pktattr->pattr_class = 632 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 633 pktattr->pattr_af = af; 634 pktattr->pattr_hdr = hdr; 635 636 m->m_data -= hlen; 637 m->m_len += hlen; 638 639 return; 640 641 bad: 642 pktattr->pattr_class = NULL; 643 pktattr->pattr_hdr = NULL; 644 pktattr->pattr_af = AF_UNSPEC; 645 } 646 #endif /* ALTQ */ 647 648 /* 649 * Process a received Ethernet packet; 650 * the packet is in the mbuf chain m with 651 * the ether header. 652 */ 653 static void 654 ether_input(struct ifnet *ifp, struct mbuf *m) 655 { 656 struct ethercom *ec = (struct ethercom *) ifp; 657 struct ifqueue *inq; 658 u_int16_t etype; 659 struct ether_header *eh; 660 #if defined (ISO) || defined (LLC) || defined(NETATALK) 661 struct llc *l; 662 #endif 663 664 if ((ifp->if_flags & IFF_UP) == 0) { 665 m_freem(m); 666 return; 667 } 668 669 #ifdef MBUFTRACE 670 m_claimm(m, &ec->ec_rx_mowner); 671 #endif 672 eh = mtod(m, struct ether_header *); 673 etype = ntohs(eh->ether_type); 674 675 /* 676 * Determine if the packet is within its size limits. 677 */ 678 if (m->m_pkthdr.len > 679 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 680 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 681 bigpktppslim)) { 682 printf("%s: discarding oversize frame (len=%d)\n", 683 ifp->if_xname, m->m_pkthdr.len); 684 } 685 m_freem(m); 686 return; 687 } 688 689 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 690 /* 691 * If this is not a simplex interface, drop the packet 692 * if it came from us. 693 */ 694 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 695 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 696 ETHER_ADDR_LEN) == 0) { 697 m_freem(m); 698 return; 699 } 700 701 if (memcmp(etherbroadcastaddr, 702 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 703 m->m_flags |= M_BCAST; 704 else 705 m->m_flags |= M_MCAST; 706 ifp->if_imcasts++; 707 } 708 709 /* If the CRC is still on the packet, trim it off. */ 710 if (m->m_flags & M_HASFCS) { 711 m_adj(m, -ETHER_CRC_LEN); 712 m->m_flags &= ~M_HASFCS; 713 } 714 715 ifp->if_ibytes += m->m_pkthdr.len; 716 717 #if NBRIDGE > 0 718 /* 719 * Tap the packet off here for a bridge. bridge_input() 720 * will return NULL if it has consumed the packet, otherwise 721 * it gets processed as normal. Note that bridge_input() 722 * will always return the original packet if we need to 723 * process it locally. 724 */ 725 if (ifp->if_bridge) { 726 if(m->m_flags & M_PROTO1) { 727 m->m_flags &= ~M_PROTO1; 728 } else { 729 /* clear M_PROMISC, in case the packets comes from a vlan */ 730 m->m_flags &= ~M_PROMISC; 731 m = bridge_input(ifp, m); 732 if (m == NULL) 733 return; 734 735 /* 736 * Bridge has determined that the packet is for us. 737 * Update our interface pointer -- we may have had 738 * to "bridge" the packet locally. 739 */ 740 ifp = m->m_pkthdr.rcvif; 741 } 742 } else 743 #endif /* NBRIDGE > 0 */ 744 { 745 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 746 (ifp->if_flags & IFF_PROMISC) != 0 && 747 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 748 ETHER_ADDR_LEN) != 0) { 749 m->m_flags |= M_PROMISC; 750 } 751 } 752 753 #ifdef PFIL_HOOKS 754 if ((m->m_flags & M_PROMISC) == 0) { 755 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 756 return; 757 if (m == NULL) 758 return; 759 760 eh = mtod(m, struct ether_header *); 761 etype = ntohs(eh->ether_type); 762 } 763 #endif 764 765 /* 766 * If VLANs are configured on the interface, check to 767 * see if the device performed the decapsulation and 768 * provided us with the tag. 769 */ 770 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 771 #if NVLAN > 0 772 /* 773 * vlan_input() will either recursively call ether_input() 774 * or drop the packet. 775 */ 776 vlan_input(ifp, m); 777 #else 778 m_freem(m); 779 #endif 780 return; 781 } 782 783 #if NAGR > 0 784 if (ifp->if_agrprivate && 785 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 786 m->m_flags &= ~M_PROMISC; 787 agr_input(ifp, m); 788 return; 789 } 790 #endif /* NAGR > 0 */ 791 792 /* 793 * Handle protocols that expect to have the Ethernet header 794 * (and possibly FCS) intact. 795 */ 796 switch (etype) { 797 #if NVLAN > 0 798 case ETHERTYPE_VLAN: 799 /* 800 * vlan_input() will either recursively call ether_input() 801 * or drop the packet. 802 */ 803 if (((struct ethercom *)ifp)->ec_nvlans != 0) 804 vlan_input(ifp, m); 805 else 806 m_freem(m); 807 return; 808 #endif /* NVLAN > 0 */ 809 #if NPPPOE > 0 810 case ETHERTYPE_PPPOEDISC: 811 case ETHERTYPE_PPPOE: 812 if (m->m_flags & M_PROMISC) { 813 m_freem(m); 814 return; 815 } 816 #ifndef PPPOE_SERVER 817 if (m->m_flags & (M_MCAST | M_BCAST)) { 818 m_freem(m); 819 return; 820 } 821 #endif 822 823 if (etype == ETHERTYPE_PPPOEDISC) 824 inq = &ppoediscinq; 825 else 826 inq = &ppoeinq; 827 if (IF_QFULL(inq)) { 828 IF_DROP(inq); 829 m_freem(m); 830 } else 831 IF_ENQUEUE(inq, m); 832 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 833 if (!callout_pending(&pppoe_softintr)) 834 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 835 #else 836 softintr_schedule(pppoe_softintr); 837 #endif 838 return; 839 #endif /* NPPPOE > 0 */ 840 case ETHERTYPE_SLOWPROTOCOLS: { 841 uint8_t subtype; 842 843 #if defined(DIAGNOSTIC) 844 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 845 panic("ether_input: too short slow protocol packet"); 846 } 847 #endif 848 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 849 switch (subtype) { 850 #if NAGR > 0 851 case SLOWPROTOCOLS_SUBTYPE_LACP: 852 if (ifp->if_agrprivate) { 853 ieee8023ad_lacp_input(ifp, m); 854 return; 855 } 856 break; 857 858 case SLOWPROTOCOLS_SUBTYPE_MARKER: 859 if (ifp->if_agrprivate) { 860 ieee8023ad_marker_input(ifp, m); 861 return; 862 } 863 break; 864 #endif /* NAGR > 0 */ 865 default: 866 if (subtype == 0 || subtype > 10) { 867 /* illegal value */ 868 m_freem(m); 869 return; 870 } 871 /* unknown subtype */ 872 break; 873 } 874 /* FALLTHROUGH */ 875 } 876 default: 877 if (m->m_flags & M_PROMISC) { 878 m_freem(m); 879 return; 880 } 881 } 882 883 /* Strip off the Ethernet header. */ 884 m_adj(m, sizeof(struct ether_header)); 885 886 /* If the CRC is still on the packet, trim it off. */ 887 if (m->m_flags & M_HASFCS) { 888 m_adj(m, -ETHER_CRC_LEN); 889 m->m_flags &= ~M_HASFCS; 890 } 891 892 switch (etype) { 893 #ifdef INET 894 case ETHERTYPE_IP: 895 #ifdef GATEWAY 896 if (ipflow_fastforward(m)) 897 return; 898 #endif 899 schednetisr(NETISR_IP); 900 inq = &ipintrq; 901 break; 902 903 case ETHERTYPE_ARP: 904 schednetisr(NETISR_ARP); 905 inq = &arpintrq; 906 break; 907 908 case ETHERTYPE_REVARP: 909 revarpinput(m); /* XXX queue? */ 910 return; 911 #endif 912 #ifdef INET6 913 case ETHERTYPE_IPV6: 914 schednetisr(NETISR_IPV6); 915 inq = &ip6intrq; 916 break; 917 #endif 918 #ifdef NS 919 case ETHERTYPE_NS: 920 schednetisr(NETISR_NS); 921 inq = &nsintrq; 922 break; 923 924 #endif 925 #ifdef IPX 926 case ETHERTYPE_IPX: 927 schednetisr(NETISR_IPX); 928 inq = &ipxintrq; 929 break; 930 #endif 931 #ifdef NETATALK 932 case ETHERTYPE_ATALK: 933 schednetisr(NETISR_ATALK); 934 inq = &atintrq1; 935 break; 936 case ETHERTYPE_AARP: 937 /* probably this should be done with a NETISR as well */ 938 aarpinput(ifp, m); /* XXX */ 939 return; 940 #endif /* NETATALK */ 941 default: 942 #if defined (ISO) || defined (LLC) || defined (NETATALK) 943 if (etype > ETHERMTU) 944 goto dropanyway; 945 l = mtod(m, struct llc *); 946 switch (l->llc_dsap) { 947 #ifdef NETATALK 948 case LLC_SNAP_LSAP: 949 switch (l->llc_control) { 950 case LLC_UI: 951 if (l->llc_ssap != LLC_SNAP_LSAP) { 952 goto dropanyway; 953 } 954 955 if (Bcmp(&(l->llc_snap_org_code)[0], 956 at_org_code, sizeof(at_org_code)) == 0 && 957 ntohs(l->llc_snap_ether_type) == 958 ETHERTYPE_ATALK) { 959 inq = &atintrq2; 960 m_adj(m, sizeof(struct llc)); 961 schednetisr(NETISR_ATALK); 962 break; 963 } 964 965 if (Bcmp(&(l->llc_snap_org_code)[0], 966 aarp_org_code, 967 sizeof(aarp_org_code)) == 0 && 968 ntohs(l->llc_snap_ether_type) == 969 ETHERTYPE_AARP) { 970 m_adj( m, sizeof(struct llc)); 971 aarpinput(ifp, m); /* XXX */ 972 return; 973 } 974 975 default: 976 goto dropanyway; 977 } 978 break; 979 #endif /* NETATALK */ 980 #ifdef ISO 981 case LLC_ISO_LSAP: 982 switch (l->llc_control) { 983 case LLC_UI: 984 /* LLC_UI_P forbidden in class 1 service */ 985 if ((l->llc_dsap == LLC_ISO_LSAP) && 986 (l->llc_ssap == LLC_ISO_LSAP)) { 987 /* LSAP for ISO */ 988 if (m->m_pkthdr.len > etype) 989 m_adj(m, etype - m->m_pkthdr.len); 990 m->m_data += 3; /* XXX */ 991 m->m_len -= 3; /* XXX */ 992 m->m_pkthdr.len -= 3; /* XXX */ 993 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 994 if (m == 0) 995 return; 996 *mtod(m, struct ether_header *) = *eh; 997 #ifdef ARGO_DEBUG 998 if (argo_debug[D_ETHER]) 999 printf("clnp packet"); 1000 #endif 1001 schednetisr(NETISR_ISO); 1002 inq = &clnlintrq; 1003 break; 1004 } 1005 goto dropanyway; 1006 1007 case LLC_XID: 1008 case LLC_XID_P: 1009 if(m->m_len < 6) 1010 goto dropanyway; 1011 l->llc_window = 0; 1012 l->llc_fid = 9; 1013 l->llc_class = 1; 1014 l->llc_dsap = l->llc_ssap = 0; 1015 /* Fall through to */ 1016 case LLC_TEST: 1017 case LLC_TEST_P: 1018 { 1019 struct sockaddr sa; 1020 struct ether_header *eh2; 1021 int i; 1022 u_char c = l->llc_dsap; 1023 1024 l->llc_dsap = l->llc_ssap; 1025 l->llc_ssap = c; 1026 if (m->m_flags & (M_BCAST | M_MCAST)) 1027 bcopy(LLADDR(ifp->if_sadl), 1028 (caddr_t)eh->ether_dhost, 6); 1029 sa.sa_family = AF_UNSPEC; 1030 sa.sa_len = sizeof(sa); 1031 eh2 = (struct ether_header *)sa.sa_data; 1032 for (i = 0; i < 6; i++) { 1033 eh2->ether_shost[i] = c = 1034 eh->ether_dhost[i]; 1035 eh2->ether_dhost[i] = 1036 eh->ether_dhost[i] = 1037 eh->ether_shost[i]; 1038 eh->ether_shost[i] = c; 1039 } 1040 ifp->if_output(ifp, m, &sa, NULL); 1041 return; 1042 } 1043 default: 1044 m_freem(m); 1045 return; 1046 } 1047 break; 1048 #endif /* ISO */ 1049 #ifdef LLC 1050 case LLC_X25_LSAP: 1051 { 1052 if (m->m_pkthdr.len > etype) 1053 m_adj(m, etype - m->m_pkthdr.len); 1054 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 1055 if (m == 0) 1056 return; 1057 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 1058 eh->ether_dhost, LLC_X25_LSAP, 6, 1059 mtod(m, struct sdl_hdr *))) 1060 panic("ETHER cons addr failure"); 1061 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 1062 #ifdef LLC_DEBUG 1063 printf("llc packet\n"); 1064 #endif /* LLC_DEBUG */ 1065 schednetisr(NETISR_CCITT); 1066 inq = &llcintrq; 1067 break; 1068 } 1069 #endif /* LLC */ 1070 dropanyway: 1071 default: 1072 m_freem(m); 1073 return; 1074 } 1075 #else /* ISO || LLC || NETATALK*/ 1076 m_freem(m); 1077 return; 1078 #endif /* ISO || LLC || NETATALK*/ 1079 } 1080 1081 if (IF_QFULL(inq)) { 1082 IF_DROP(inq); 1083 m_freem(m); 1084 } else 1085 IF_ENQUEUE(inq, m); 1086 } 1087 1088 /* 1089 * Convert Ethernet address to printable (loggable) representation. 1090 */ 1091 char * 1092 ether_sprintf(const u_char *ap) 1093 { 1094 static char etherbuf[3 * ETHER_ADDR_LEN]; 1095 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1096 return etherbuf; 1097 } 1098 1099 char * 1100 ether_snprintf(char *buf, size_t len, const u_char *ap) 1101 { 1102 char *cp = buf; 1103 size_t i; 1104 1105 for (i = 0; i < len / 3; i++) { 1106 *cp++ = hexdigits[*ap >> 4]; 1107 *cp++ = hexdigits[*ap++ & 0xf]; 1108 *cp++ = ':'; 1109 } 1110 *--cp = '\0'; 1111 return buf; 1112 } 1113 1114 /* 1115 * Perform common duties while attaching to interface list 1116 */ 1117 void 1118 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1119 { 1120 struct ethercom *ec = (struct ethercom *)ifp; 1121 1122 ifp->if_type = IFT_ETHER; 1123 ifp->if_addrlen = ETHER_ADDR_LEN; 1124 ifp->if_hdrlen = ETHER_HDR_LEN; 1125 ifp->if_dlt = DLT_EN10MB; 1126 ifp->if_mtu = ETHERMTU; 1127 ifp->if_output = ether_output; 1128 ifp->if_input = ether_input; 1129 if (ifp->if_baudrate == 0) 1130 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1131 1132 if_alloc_sadl(ifp); 1133 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1134 1135 LIST_INIT(&ec->ec_multiaddrs); 1136 ifp->if_broadcastaddr = etherbroadcastaddr; 1137 #if NBPFILTER > 0 1138 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1139 #endif 1140 #ifdef MBUFTRACE 1141 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1142 sizeof(ec->ec_tx_mowner.mo_name)); 1143 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1144 sizeof(ec->ec_tx_mowner.mo_descr)); 1145 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1146 sizeof(ec->ec_rx_mowner.mo_name)); 1147 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1148 sizeof(ec->ec_rx_mowner.mo_descr)); 1149 MOWNER_ATTACH(&ec->ec_tx_mowner); 1150 MOWNER_ATTACH(&ec->ec_rx_mowner); 1151 ifp->if_mowner = &ec->ec_tx_mowner; 1152 #endif 1153 } 1154 1155 void 1156 ether_ifdetach(struct ifnet *ifp) 1157 { 1158 struct ethercom *ec = (void *) ifp; 1159 struct ether_multi *enm; 1160 int s; 1161 1162 #if NBRIDGE > 0 1163 if (ifp->if_bridge) 1164 bridge_ifdetach(ifp); 1165 #endif 1166 1167 #if NBPFILTER > 0 1168 bpfdetach(ifp); 1169 #endif 1170 1171 #if NVLAN > 0 1172 if (ec->ec_nvlans) 1173 vlan_ifdetach(ifp); 1174 #endif 1175 1176 s = splnet(); 1177 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1178 LIST_REMOVE(enm, enm_list); 1179 free(enm, M_IFMADDR); 1180 ec->ec_multicnt--; 1181 } 1182 splx(s); 1183 1184 #if 0 /* done in if_detach() */ 1185 if_free_sadl(ifp); 1186 #endif 1187 1188 MOWNER_DETACH(&ec->ec_rx_mowner); 1189 MOWNER_DETACH(&ec->ec_tx_mowner); 1190 } 1191 1192 #if 0 1193 /* 1194 * This is for reference. We have a table-driven version 1195 * of the little-endian crc32 generator, which is faster 1196 * than the double-loop. 1197 */ 1198 u_int32_t 1199 ether_crc32_le(const u_int8_t *buf, size_t len) 1200 { 1201 u_int32_t c, crc, carry; 1202 size_t i, j; 1203 1204 crc = 0xffffffffU; /* initial value */ 1205 1206 for (i = 0; i < len; i++) { 1207 c = buf[i]; 1208 for (j = 0; j < 8; j++) { 1209 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1210 crc >>= 1; 1211 c >>= 1; 1212 if (carry) 1213 crc = (crc ^ ETHER_CRC_POLY_LE); 1214 } 1215 } 1216 1217 return (crc); 1218 } 1219 #else 1220 u_int32_t 1221 ether_crc32_le(const u_int8_t *buf, size_t len) 1222 { 1223 static const u_int32_t crctab[] = { 1224 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1225 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1226 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1227 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1228 }; 1229 u_int32_t crc; 1230 size_t i; 1231 1232 crc = 0xffffffffU; /* initial value */ 1233 1234 for (i = 0; i < len; i++) { 1235 crc ^= buf[i]; 1236 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1237 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1238 } 1239 1240 return (crc); 1241 } 1242 #endif 1243 1244 u_int32_t 1245 ether_crc32_be(const u_int8_t *buf, size_t len) 1246 { 1247 u_int32_t c, crc, carry; 1248 size_t i, j; 1249 1250 crc = 0xffffffffU; /* initial value */ 1251 1252 for (i = 0; i < len; i++) { 1253 c = buf[i]; 1254 for (j = 0; j < 8; j++) { 1255 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1256 crc <<= 1; 1257 c >>= 1; 1258 if (carry) 1259 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1260 } 1261 } 1262 1263 return (crc); 1264 } 1265 1266 #ifdef INET 1267 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1268 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1269 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1270 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1271 #endif 1272 #ifdef INET6 1273 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1274 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1275 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1276 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1277 #endif 1278 1279 /* 1280 * Convert a sockaddr into an Ethernet address or range of Ethernet 1281 * addresses. 1282 */ 1283 int 1284 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1285 u_int8_t addrhi[ETHER_ADDR_LEN]) 1286 { 1287 #ifdef INET 1288 struct sockaddr_in *sin; 1289 #endif /* INET */ 1290 #ifdef INET6 1291 struct sockaddr_in6 *sin6; 1292 #endif /* INET6 */ 1293 1294 switch (sa->sa_family) { 1295 1296 case AF_UNSPEC: 1297 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1298 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1299 break; 1300 1301 #ifdef INET 1302 case AF_INET: 1303 sin = satosin(sa); 1304 if (sin->sin_addr.s_addr == INADDR_ANY) { 1305 /* 1306 * An IP address of INADDR_ANY means listen to 1307 * or stop listening to all of the Ethernet 1308 * multicast addresses used for IP. 1309 * (This is for the sake of IP multicast routers.) 1310 */ 1311 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1312 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1313 } 1314 else { 1315 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1316 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1317 } 1318 break; 1319 #endif 1320 #ifdef INET6 1321 case AF_INET6: 1322 sin6 = satosin6(sa); 1323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1324 /* 1325 * An IP6 address of 0 means listen to or stop 1326 * listening to all of the Ethernet multicast 1327 * address used for IP6. 1328 * (This is used for multicast routers.) 1329 */ 1330 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1331 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1332 } else { 1333 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1334 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1335 } 1336 break; 1337 #endif 1338 1339 default: 1340 return (EAFNOSUPPORT); 1341 } 1342 return (0); 1343 } 1344 1345 /* 1346 * Add an Ethernet multicast address or range of addresses to the list for a 1347 * given interface. 1348 */ 1349 int 1350 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1351 { 1352 struct ether_multi *enm; 1353 u_char addrlo[ETHER_ADDR_LEN]; 1354 u_char addrhi[ETHER_ADDR_LEN]; 1355 int s = splnet(), error; 1356 1357 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1358 if (error != 0) { 1359 splx(s); 1360 return (error); 1361 } 1362 1363 /* 1364 * Verify that we have valid Ethernet multicast addresses. 1365 */ 1366 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1367 splx(s); 1368 return (EINVAL); 1369 } 1370 /* 1371 * See if the address range is already in the list. 1372 */ 1373 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1374 if (enm != NULL) { 1375 /* 1376 * Found it; just increment the reference count. 1377 */ 1378 ++enm->enm_refcount; 1379 splx(s); 1380 return (0); 1381 } 1382 /* 1383 * New address or range; malloc a new multicast record 1384 * and link it into the interface's multicast list. 1385 */ 1386 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1387 if (enm == NULL) { 1388 splx(s); 1389 return (ENOBUFS); 1390 } 1391 bcopy(addrlo, enm->enm_addrlo, 6); 1392 bcopy(addrhi, enm->enm_addrhi, 6); 1393 enm->enm_refcount = 1; 1394 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1395 ec->ec_multicnt++; 1396 splx(s); 1397 /* 1398 * Return ENETRESET to inform the driver that the list has changed 1399 * and its reception filter should be adjusted accordingly. 1400 */ 1401 return (ENETRESET); 1402 } 1403 1404 /* 1405 * Delete a multicast address record. 1406 */ 1407 int 1408 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1409 { 1410 struct ether_multi *enm; 1411 u_char addrlo[ETHER_ADDR_LEN]; 1412 u_char addrhi[ETHER_ADDR_LEN]; 1413 int s = splnet(), error; 1414 1415 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1416 if (error != 0) { 1417 splx(s); 1418 return (error); 1419 } 1420 1421 /* 1422 * Look ur the address in our list. 1423 */ 1424 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1425 if (enm == NULL) { 1426 splx(s); 1427 return (ENXIO); 1428 } 1429 if (--enm->enm_refcount != 0) { 1430 /* 1431 * Still some claims to this record. 1432 */ 1433 splx(s); 1434 return (0); 1435 } 1436 /* 1437 * No remaining claims to this record; unlink and free it. 1438 */ 1439 LIST_REMOVE(enm, enm_list); 1440 free(enm, M_IFMADDR); 1441 ec->ec_multicnt--; 1442 splx(s); 1443 /* 1444 * Return ENETRESET to inform the driver that the list has changed 1445 * and its reception filter should be adjusted accordingly. 1446 */ 1447 return (ENETRESET); 1448 } 1449 1450 /* 1451 * Common ioctls for Ethernet interfaces. Note, we must be 1452 * called at splnet(). 1453 */ 1454 int 1455 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1456 { 1457 struct ethercom *ec = (void *) ifp; 1458 struct ifreq *ifr = (struct ifreq *)data; 1459 struct ifaddr *ifa = (struct ifaddr *)data; 1460 int error = 0; 1461 1462 switch (cmd) { 1463 case SIOCSIFADDR: 1464 ifp->if_flags |= IFF_UP; 1465 switch (ifa->ifa_addr->sa_family) { 1466 case AF_LINK: 1467 { 1468 struct sockaddr_dl *sdl = 1469 (struct sockaddr_dl *) ifa->ifa_addr; 1470 1471 if (sdl->sdl_type != IFT_ETHER || 1472 sdl->sdl_alen != ifp->if_addrlen) { 1473 error = EINVAL; 1474 break; 1475 } 1476 1477 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1478 ifp->if_addrlen); 1479 1480 /* Set new address. */ 1481 error = (*ifp->if_init)(ifp); 1482 break; 1483 } 1484 #ifdef INET 1485 case AF_INET: 1486 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1487 (error = (*ifp->if_init)(ifp)) != 0) 1488 break; 1489 arp_ifinit(ifp, ifa); 1490 break; 1491 #endif /* INET */ 1492 #ifdef NS 1493 case AF_NS: 1494 { 1495 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1496 1497 if (ns_nullhost(*ina)) 1498 ina->x_host = *(union ns_host *) 1499 LLADDR(ifp->if_sadl); 1500 else 1501 memcpy(LLADDR(ifp->if_sadl), 1502 ina->x_host.c_host, ifp->if_addrlen); 1503 /* Set new address. */ 1504 error = (*ifp->if_init)(ifp); 1505 break; 1506 } 1507 #endif /* NS */ 1508 default: 1509 if ((ifp->if_flags & IFF_RUNNING) == 0) 1510 error = (*ifp->if_init)(ifp); 1511 break; 1512 } 1513 break; 1514 1515 case SIOCGIFADDR: 1516 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1517 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1518 break; 1519 1520 case SIOCSIFMTU: 1521 { 1522 int maxmtu; 1523 1524 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1525 maxmtu = ETHERMTU_JUMBO; 1526 else 1527 maxmtu = ETHERMTU; 1528 1529 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1530 error = EINVAL; 1531 else { 1532 ifp->if_mtu = ifr->ifr_mtu; 1533 1534 /* Make sure the device notices the MTU change. */ 1535 if (ifp->if_flags & IFF_UP) 1536 error = (*ifp->if_init)(ifp); 1537 } 1538 break; 1539 } 1540 1541 case SIOCSIFFLAGS: 1542 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1543 /* 1544 * If interface is marked down and it is running, 1545 * then stop and disable it. 1546 */ 1547 (*ifp->if_stop)(ifp, 1); 1548 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1549 /* 1550 * If interface is marked up and it is stopped, then 1551 * start it. 1552 */ 1553 error = (*ifp->if_init)(ifp); 1554 } else if ((ifp->if_flags & IFF_UP) != 0) { 1555 /* 1556 * Reset the interface to pick up changes in any other 1557 * flags that affect the hardware state. 1558 */ 1559 error = (*ifp->if_init)(ifp); 1560 } 1561 break; 1562 1563 case SIOCADDMULTI: 1564 error = ether_addmulti(ifr, ec); 1565 break; 1566 1567 case SIOCDELMULTI: 1568 error = ether_delmulti(ifr, ec); 1569 break; 1570 1571 default: 1572 error = ENOTTY; 1573 } 1574 1575 return (error); 1576 } 1577
Indexes created Sun Sep 21 20:09:37 GMT 2025