if_ethersubr.c revision 1.128.10.2
1 /* $NetBSD: if_ethersubr.c,v 1.128.10.2 2006/05/06 23:31:58 christos 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 1.128.10.2 2006/05/06 23:31:58 christos 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 #include <sys/kauth.h> 95 96 #include <machine/cpu.h> 97 98 #include <net/if.h> 99 #include <net/netisr.h> 100 #include <net/route.h> 101 #include <net/if_llc.h> 102 #include <net/if_dl.h> 103 #include <net/if_types.h> 104 105 #if NARP == 0 106 /* 107 * XXX there should really be a way to issue this warning from within config(8) 108 */ 109 #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. 110 #endif 111 112 #if NBPFILTER > 0 113 #include <net/bpf.h> 114 #endif 115 116 #include <net/if_ether.h> 117 #if NVLAN > 0 118 #include <net/if_vlanvar.h> 119 #endif 120 121 #if NPPPOE > 0 122 #include <net/if_pppoe.h> 123 #endif 124 125 #if NAGR > 0 126 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 127 #include <net/agr/ieee8023ad.h> 128 #include <net/agr/if_agrvar.h> 129 #endif 130 131 #if NBRIDGE > 0 132 #include <net/if_bridgevar.h> 133 #endif 134 135 #include <netinet/in.h> 136 #ifdef INET 137 #include <netinet/in_var.h> 138 #endif 139 #include <netinet/if_inarp.h> 140 141 #ifdef INET6 142 #ifndef INET 143 #include <netinet/in.h> 144 #endif 145 #include <netinet6/in6_var.h> 146 #include <netinet6/nd6.h> 147 #endif 148 149 #ifdef NS 150 #include <netns/ns.h> 151 #include <netns/ns_if.h> 152 #endif 153 154 #ifdef IPX 155 #include <netipx/ipx.h> 156 #include <netipx/ipx_if.h> 157 #endif 158 159 #ifdef ISO 160 #include <netiso/argo_debug.h> 161 #include <netiso/iso.h> 162 #include <netiso/iso_var.h> 163 #include <netiso/iso_snpac.h> 164 #endif 165 166 #ifdef LLC 167 #include <netccitt/dll.h> 168 #include <netccitt/llc_var.h> 169 #endif 170 171 #if defined(LLC) && defined(CCITT) 172 extern struct ifqueue pkintrq; 173 #endif 174 175 #ifdef NETATALK 176 #include <netatalk/at.h> 177 #include <netatalk/at_var.h> 178 #include <netatalk/at_extern.h> 179 180 #define llc_snap_org_code llc_un.type_snap.org_code 181 #define llc_snap_ether_type llc_un.type_snap.ether_type 182 183 extern u_char at_org_code[3]; 184 extern u_char aarp_org_code[3]; 185 #endif /* NETATALK */ 186 187 static struct timeval bigpktppslim_last; 188 static int bigpktppslim = 2; /* XXX */ 189 static int bigpktpps_count; 190 191 192 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 193 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 194 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 195 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 196 #define senderr(e) { error = (e); goto bad;} 197 198 #define SIN(x) ((struct sockaddr_in *)x) 199 200 static int ether_output(struct ifnet *, struct mbuf *, 201 struct sockaddr *, struct rtentry *); 202 static void ether_input(struct ifnet *, struct mbuf *); 203 204 /* 205 * Ethernet output routine. 206 * Encapsulate a packet of type family for the local net. 207 * Assumes that ifp is actually pointer to ethercom structure. 208 */ 209 static int 210 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 211 struct rtentry *rt0) 212 { 213 u_int16_t etype = 0; 214 int error = 0, hdrcmplt = 0; 215 u_char esrc[6], edst[6]; 216 struct mbuf *m = m0; 217 struct rtentry *rt; 218 struct mbuf *mcopy = (struct mbuf *)0; 219 struct ether_header *eh; 220 ALTQ_DECL(struct altq_pktattr pktattr;) 221 #ifdef INET 222 struct arphdr *ah; 223 #endif /* INET */ 224 #ifdef NETATALK 225 struct at_ifaddr *aa; 226 #endif /* NETATALK */ 227 228 #ifdef MBUFTRACE 229 m_claimm(m, ifp->if_mowner); 230 #endif 231 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 232 senderr(ENETDOWN); 233 if ((rt = rt0) != NULL) { 234 if ((rt->rt_flags & RTF_UP) == 0) { 235 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 236 rt->rt_refcnt--; 237 if (rt->rt_ifp != ifp) 238 return (*rt->rt_ifp->if_output) 239 (ifp, m0, dst, rt); 240 } else 241 senderr(EHOSTUNREACH); 242 } 243 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 244 if (rt->rt_gwroute == 0) 245 goto lookup; 246 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 247 rtfree(rt); rt = rt0; 248 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 249 if ((rt = rt->rt_gwroute) == 0) 250 senderr(EHOSTUNREACH); 251 /* the "G" test below also prevents rt == rt0 */ 252 if ((rt->rt_flags & RTF_GATEWAY) || 253 (rt->rt_ifp != ifp)) { 254 rt->rt_refcnt--; 255 rt0->rt_gwroute = 0; 256 senderr(EHOSTUNREACH); 257 } 258 } 259 } 260 if (rt->rt_flags & RTF_REJECT) 261 if (rt->rt_rmx.rmx_expire == 0 || 262 (u_long) time.tv_sec < rt->rt_rmx.rmx_expire) 263 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 264 } 265 266 switch (dst->sa_family) { 267 268 #ifdef INET 269 case AF_INET: 270 if (m->m_flags & M_BCAST) 271 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 272 273 else if (m->m_flags & M_MCAST) { 274 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 275 (caddr_t)edst) 276 277 } else if (!arpresolve(ifp, rt, m, dst, edst)) 278 return (0); /* if not yet resolved */ 279 /* If broadcasting on a simplex interface, loopback a copy */ 280 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 281 mcopy = m_copy(m, 0, (int)M_COPYALL); 282 etype = htons(ETHERTYPE_IP); 283 break; 284 285 case AF_ARP: 286 ah = mtod(m, struct arphdr *); 287 if (m->m_flags & M_BCAST) 288 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 289 else 290 bcopy((caddr_t)ar_tha(ah), 291 (caddr_t)edst, sizeof(edst)); 292 293 ah->ar_hrd = htons(ARPHRD_ETHER); 294 295 switch (ntohs(ah->ar_op)) { 296 case ARPOP_REVREQUEST: 297 case ARPOP_REVREPLY: 298 etype = htons(ETHERTYPE_REVARP); 299 break; 300 301 case ARPOP_REQUEST: 302 case ARPOP_REPLY: 303 default: 304 etype = htons(ETHERTYPE_ARP); 305 } 306 307 break; 308 #endif 309 #ifdef INET6 310 case AF_INET6: 311 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 312 /* something bad happened */ 313 return (0); 314 } 315 etype = htons(ETHERTYPE_IPV6); 316 break; 317 #endif 318 #ifdef NETATALK 319 case AF_APPLETALK: 320 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 321 #ifdef NETATALKDEBUG 322 printf("aarpresolv failed\n"); 323 #endif /* NETATALKDEBUG */ 324 return (0); 325 } 326 /* 327 * ifaddr is the first thing in at_ifaddr 328 */ 329 aa = (struct at_ifaddr *) at_ifawithnet( 330 (struct sockaddr_at *)dst, ifp); 331 if (aa == NULL) 332 goto bad; 333 334 /* 335 * In the phase 2 case, we need to prepend an mbuf for the 336 * llc header. Since we must preserve the value of m, 337 * which is passed to us by value, we m_copy() the first 338 * mbuf, and use it for our llc header. 339 */ 340 if (aa->aa_flags & AFA_PHASE2) { 341 struct llc llc; 342 343 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 344 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 345 llc.llc_control = LLC_UI; 346 bcopy(at_org_code, llc.llc_snap_org_code, 347 sizeof(llc.llc_snap_org_code)); 348 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 349 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 350 } else { 351 etype = htons(ETHERTYPE_ATALK); 352 } 353 break; 354 #endif /* NETATALK */ 355 #ifdef NS 356 case AF_NS: 357 etype = htons(ETHERTYPE_NS); 358 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 359 (caddr_t)edst, sizeof (edst)); 360 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 361 return (looutput(ifp, m, dst, rt)); 362 /* If broadcasting on a simplex interface, loopback a copy */ 363 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 364 mcopy = m_copy(m, 0, (int)M_COPYALL); 365 break; 366 #endif 367 #ifdef IPX 368 case AF_IPX: 369 etype = htons(ETHERTYPE_IPX); 370 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 371 (caddr_t)edst, sizeof (edst)); 372 /* If broadcasting on a simplex interface, loopback a copy */ 373 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 374 mcopy = m_copy(m, 0, (int)M_COPYALL); 375 break; 376 #endif 377 #ifdef ISO 378 case AF_ISO: { 379 int snpalen; 380 struct llc *l; 381 struct sockaddr_dl *sdl; 382 383 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 384 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 385 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 386 } else { 387 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 388 (char *)edst, &snpalen); 389 if (error) 390 goto bad; /* Not Resolved */ 391 } 392 /* If broadcasting on a simplex interface, loopback a copy */ 393 if (*edst & 1) 394 m->m_flags |= (M_BCAST|M_MCAST); 395 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 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 M_PREPEND(m, 3, M_DONTWAIT); 407 if (m == NULL) 408 return (0); 409 l = mtod(m, struct llc *); 410 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 411 l->llc_control = LLC_UI; 412 #ifdef ARGO_DEBUG 413 if (argo_debug[D_ETHER]) { 414 int i; 415 printf("unoutput: sending pkt to: "); 416 for (i=0; i<6; i++) 417 printf("%x ", edst[i] & 0xff); 418 printf("\n"); 419 } 420 #endif 421 } break; 422 #endif /* ISO */ 423 #ifdef LLC 424 /* case AF_NSAP: */ 425 case AF_CCITT: { 426 struct sockaddr_dl *sdl = rt ? 427 (struct sockaddr_dl *) rt -> rt_gateway : NULL; 428 429 if (sdl && sdl->sdl_family == AF_LINK 430 && sdl->sdl_alen > 0) { 431 bcopy(LLADDR(sdl), (char *)edst, 432 sizeof(edst)); 433 } else goto bad; /* Not a link interface ? Funny ... */ 434 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 435 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 436 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 437 if (mcopy) { 438 eh = mtod(mcopy, struct ether_header *); 439 bcopy((caddr_t)edst, 440 (caddr_t)eh->ether_dhost, sizeof (edst)); 441 bcopy(LLADDR(ifp->if_sadl), 442 (caddr_t)eh->ether_shost, sizeof (edst)); 443 } 444 } 445 #ifdef LLC_DEBUG 446 { 447 int i; 448 struct llc *l = mtod(m, struct llc *); 449 450 printf("ether_output: sending LLC2 pkt to: "); 451 for (i=0; i<6; i++) 452 printf("%x ", edst[i] & 0xff); 453 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 454 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 455 l->llc_control & 0xff); 456 457 } 458 #endif /* LLC_DEBUG */ 459 } break; 460 #endif /* LLC */ 461 462 case pseudo_AF_HDRCMPLT: 463 hdrcmplt = 1; 464 eh = (struct ether_header *)dst->sa_data; 465 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 466 /* FALLTHROUGH */ 467 468 case AF_UNSPEC: 469 eh = (struct ether_header *)dst->sa_data; 470 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 471 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 472 etype = eh->ether_type; 473 break; 474 475 default: 476 printf("%s: can't handle af%d\n", ifp->if_xname, 477 dst->sa_family); 478 senderr(EAFNOSUPPORT); 479 } 480 481 if (mcopy) 482 (void) looutput(ifp, mcopy, dst, rt); 483 484 /* If no ether type is set, this must be a 802.2 formatted packet. 485 */ 486 if (etype == 0) 487 etype = htons(m->m_pkthdr.len); 488 /* 489 * Add local net header. If no space in first mbuf, 490 * allocate another. 491 */ 492 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 493 if (m == 0) 494 senderr(ENOBUFS); 495 eh = mtod(m, struct ether_header *); 496 /* Note: etype is already in network byte order. */ 497 #ifdef __NO_STRICT_ALIGNMENT 498 eh->ether_type = etype; 499 #else 500 { 501 uint8_t *dstp = (uint8_t *) &eh->ether_type; 502 #if BYTE_ORDER == BIG_ENDIAN 503 dstp[0] = etype >> 8; 504 dstp[1] = etype; 505 #else 506 dstp[0] = etype; 507 dstp[1] = etype >> 8; 508 #endif /* BYTE_ORDER == BIG_ENDIAN */ 509 } 510 #endif /* __NO_STRICT_ALIGNMENT */ 511 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 512 if (hdrcmplt) 513 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 514 sizeof(eh->ether_shost)); 515 else 516 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 517 sizeof(eh->ether_shost)); 518 519 #ifdef PFIL_HOOKS 520 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 521 return (error); 522 if (m == NULL) 523 return (0); 524 #endif 525 526 #if NBRIDGE > 0 527 /* 528 * Bridges require special output handling. 529 */ 530 if (ifp->if_bridge) 531 return (bridge_output(ifp, m, NULL, NULL)); 532 #endif 533 534 #ifdef ALTQ 535 /* 536 * If ALTQ is enabled on the parent interface, do 537 * classification; the queueing discipline might not 538 * require classification, but might require the 539 * address family/header pointer in the pktattr. 540 */ 541 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 542 altq_etherclassify(&ifp->if_snd, m, &pktattr); 543 #endif 544 545 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 546 547 bad: 548 if (m) 549 m_freem(m); 550 return (error); 551 } 552 553 #ifdef ALTQ 554 /* 555 * This routine is a slight hack to allow a packet to be classified 556 * if the Ethernet headers are present. It will go away when ALTQ's 557 * classification engine understands link headers. 558 */ 559 void 560 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 561 struct altq_pktattr *pktattr) 562 { 563 struct ether_header *eh; 564 u_int16_t ether_type; 565 int hlen, af, hdrsize; 566 caddr_t hdr; 567 568 hlen = ETHER_HDR_LEN; 569 eh = mtod(m, struct ether_header *); 570 571 ether_type = htons(eh->ether_type); 572 573 if (ether_type < ETHERMTU) { 574 /* LLC/SNAP */ 575 struct llc *llc = (struct llc *)(eh + 1); 576 hlen += 8; 577 578 if (m->m_len < hlen || 579 llc->llc_dsap != LLC_SNAP_LSAP || 580 llc->llc_ssap != LLC_SNAP_LSAP || 581 llc->llc_control != LLC_UI) { 582 /* Not SNAP. */ 583 goto bad; 584 } 585 586 ether_type = htons(llc->llc_un.type_snap.ether_type); 587 } 588 589 switch (ether_type) { 590 case ETHERTYPE_IP: 591 af = AF_INET; 592 hdrsize = 20; /* sizeof(struct ip) */ 593 break; 594 595 case ETHERTYPE_IPV6: 596 af = AF_INET6; 597 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 598 break; 599 600 default: 601 af = AF_UNSPEC; 602 hdrsize = 0; 603 break; 604 } 605 606 while (m->m_len <= hlen) { 607 hlen -= m->m_len; 608 m = m->m_next; 609 } 610 if (m->m_len < (hlen + hdrsize)) { 611 /* 612 * protocol header not in a single mbuf. 613 * We can't cope with this situation right 614 * now (but it shouldn't ever happen, really, anyhow). 615 */ 616 #ifdef DEBUG 617 printf("altq_etherclassify: headers span multiple mbufs: " 618 "%d < %d\n", m->m_len, (hlen + hdrsize)); 619 #endif 620 goto bad; 621 } 622 623 m->m_data += hlen; 624 m->m_len -= hlen; 625 626 hdr = mtod(m, caddr_t); 627 628 if (ALTQ_NEEDS_CLASSIFY(ifq)) 629 pktattr->pattr_class = 630 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 631 pktattr->pattr_af = af; 632 pktattr->pattr_hdr = hdr; 633 634 m->m_data -= hlen; 635 m->m_len += hlen; 636 637 return; 638 639 bad: 640 pktattr->pattr_class = NULL; 641 pktattr->pattr_hdr = NULL; 642 pktattr->pattr_af = AF_UNSPEC; 643 } 644 #endif /* ALTQ */ 645 646 /* 647 * Process a received Ethernet packet; 648 * the packet is in the mbuf chain m with 649 * the ether header. 650 */ 651 static void 652 ether_input(struct ifnet *ifp, struct mbuf *m) 653 { 654 struct ethercom *ec = (struct ethercom *) ifp; 655 struct ifqueue *inq; 656 u_int16_t etype; 657 struct ether_header *eh; 658 #if defined (ISO) || defined (LLC) || defined(NETATALK) 659 struct llc *l; 660 #endif 661 662 if ((ifp->if_flags & IFF_UP) == 0) { 663 m_freem(m); 664 return; 665 } 666 667 #ifdef MBUFTRACE 668 m_claimm(m, &ec->ec_rx_mowner); 669 #endif 670 eh = mtod(m, struct ether_header *); 671 etype = ntohs(eh->ether_type); 672 673 /* 674 * Determine if the packet is within its size limits. 675 */ 676 if (m->m_pkthdr.len > 677 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 678 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 679 bigpktppslim)) { 680 printf("%s: discarding oversize frame (len=%d)\n", 681 ifp->if_xname, m->m_pkthdr.len); 682 } 683 m_freem(m); 684 return; 685 } 686 687 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 688 /* 689 * If this is not a simplex interface, drop the packet 690 * if it came from us. 691 */ 692 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 693 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 694 ETHER_ADDR_LEN) == 0) { 695 m_freem(m); 696 return; 697 } 698 699 if (memcmp(etherbroadcastaddr, 700 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 701 m->m_flags |= M_BCAST; 702 else 703 m->m_flags |= M_MCAST; 704 ifp->if_imcasts++; 705 } 706 707 /* If the CRC is still on the packet, trim it off. */ 708 if (m->m_flags & M_HASFCS) { 709 m_adj(m, -ETHER_CRC_LEN); 710 m->m_flags &= ~M_HASFCS; 711 } 712 713 ifp->if_ibytes += m->m_pkthdr.len; 714 715 #if NBRIDGE > 0 716 /* 717 * Tap the packet off here for a bridge. bridge_input() 718 * will return NULL if it has consumed the packet, otherwise 719 * it gets processed as normal. Note that bridge_input() 720 * will always return the original packet if we need to 721 * process it locally. 722 */ 723 if (ifp->if_bridge) { 724 if(m->m_flags & M_PROTO1) { 725 m->m_flags &= ~M_PROTO1; 726 } else { 727 /* clear M_PROMISC, in case the packets comes from a vlan */ 728 m->m_flags &= ~M_PROMISC; 729 m = bridge_input(ifp, m); 730 if (m == NULL) 731 return; 732 733 /* 734 * Bridge has determined that the packet is for us. 735 * Update our interface pointer -- we may have had 736 * to "bridge" the packet locally. 737 */ 738 ifp = m->m_pkthdr.rcvif; 739 } 740 } else 741 #endif /* NBRIDGE > 0 */ 742 { 743 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 744 (ifp->if_flags & IFF_PROMISC) != 0 && 745 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 746 ETHER_ADDR_LEN) != 0) { 747 m->m_flags |= M_PROMISC; 748 } 749 } 750 751 #ifdef PFIL_HOOKS 752 if ((m->m_flags & M_PROMISC) == 0) { 753 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 754 return; 755 if (m == NULL) 756 return; 757 758 eh = mtod(m, struct ether_header *); 759 etype = ntohs(eh->ether_type); 760 } 761 #endif 762 763 /* 764 * If VLANs are configured on the interface, check to 765 * see if the device performed the decapsulation and 766 * provided us with the tag. 767 */ 768 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 769 #if NVLAN > 0 770 /* 771 * vlan_input() will either recursively call ether_input() 772 * or drop the packet. 773 */ 774 vlan_input(ifp, m); 775 #else 776 m_freem(m); 777 #endif 778 return; 779 } 780 781 #if NAGR > 0 782 if (ifp->if_agrprivate && 783 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 784 m->m_flags &= ~M_PROMISC; 785 agr_input(ifp, m); 786 return; 787 } 788 #endif /* NAGR > 0 */ 789 790 /* 791 * Handle protocols that expect to have the Ethernet header 792 * (and possibly FCS) intact. 793 */ 794 switch (etype) { 795 #if NVLAN > 0 796 case ETHERTYPE_VLAN: 797 /* 798 * vlan_input() will either recursively call ether_input() 799 * or drop the packet. 800 */ 801 if (((struct ethercom *)ifp)->ec_nvlans != 0) 802 vlan_input(ifp, m); 803 else 804 m_freem(m); 805 return; 806 #endif /* NVLAN > 0 */ 807 #if NPPPOE > 0 808 case ETHERTYPE_PPPOEDISC: 809 case ETHERTYPE_PPPOE: 810 if (m->m_flags & M_PROMISC) { 811 m_freem(m); 812 return; 813 } 814 #ifndef PPPOE_SERVER 815 if (m->m_flags & (M_MCAST | M_BCAST)) { 816 m_freem(m); 817 return; 818 } 819 #endif 820 821 if (etype == ETHERTYPE_PPPOEDISC) 822 inq = &ppoediscinq; 823 else 824 inq = &ppoeinq; 825 if (IF_QFULL(inq)) { 826 IF_DROP(inq); 827 m_freem(m); 828 } else 829 IF_ENQUEUE(inq, m); 830 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 831 if (!callout_pending(&pppoe_softintr)) 832 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 833 #else 834 softintr_schedule(pppoe_softintr); 835 #endif 836 return; 837 #endif /* NPPPOE > 0 */ 838 case ETHERTYPE_SLOWPROTOCOLS: { 839 uint8_t subtype; 840 841 #if defined(DIAGNOSTIC) 842 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 843 panic("ether_input: too short slow protocol packet"); 844 } 845 #endif 846 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 847 switch (subtype) { 848 #if NAGR > 0 849 case SLOWPROTOCOLS_SUBTYPE_LACP: 850 if (ifp->if_agrprivate) { 851 ieee8023ad_lacp_input(ifp, m); 852 return; 853 } 854 break; 855 856 case SLOWPROTOCOLS_SUBTYPE_MARKER: 857 if (ifp->if_agrprivate) { 858 ieee8023ad_marker_input(ifp, m); 859 return; 860 } 861 break; 862 #endif /* NAGR > 0 */ 863 default: 864 if (subtype == 0 || subtype > 10) { 865 /* illegal value */ 866 m_freem(m); 867 return; 868 } 869 /* unknown subtype */ 870 break; 871 } 872 /* FALLTHROUGH */ 873 } 874 default: 875 if (m->m_flags & M_PROMISC) { 876 m_freem(m); 877 return; 878 } 879 } 880 881 /* Strip off the Ethernet header. */ 882 m_adj(m, sizeof(struct ether_header)); 883 884 /* If the CRC is still on the packet, trim it off. */ 885 if (m->m_flags & M_HASFCS) { 886 m_adj(m, -ETHER_CRC_LEN); 887 m->m_flags &= ~M_HASFCS; 888 } 889 890 switch (etype) { 891 #ifdef INET 892 case ETHERTYPE_IP: 893 #ifdef GATEWAY 894 if (ipflow_fastforward(m)) 895 return; 896 #endif 897 schednetisr(NETISR_IP); 898 inq = &ipintrq; 899 break; 900 901 case ETHERTYPE_ARP: 902 schednetisr(NETISR_ARP); 903 inq = &arpintrq; 904 break; 905 906 case ETHERTYPE_REVARP: 907 revarpinput(m); /* XXX queue? */ 908 return; 909 #endif 910 #ifdef INET6 911 case ETHERTYPE_IPV6: 912 schednetisr(NETISR_IPV6); 913 inq = &ip6intrq; 914 break; 915 #endif 916 #ifdef NS 917 case ETHERTYPE_NS: 918 schednetisr(NETISR_NS); 919 inq = &nsintrq; 920 break; 921 922 #endif 923 #ifdef IPX 924 case ETHERTYPE_IPX: 925 schednetisr(NETISR_IPX); 926 inq = &ipxintrq; 927 break; 928 #endif 929 #ifdef NETATALK 930 case ETHERTYPE_ATALK: 931 schednetisr(NETISR_ATALK); 932 inq = &atintrq1; 933 break; 934 case ETHERTYPE_AARP: 935 /* probably this should be done with a NETISR as well */ 936 aarpinput(ifp, m); /* XXX */ 937 return; 938 #endif /* NETATALK */ 939 default: 940 #if defined (ISO) || defined (LLC) || defined (NETATALK) 941 if (etype > ETHERMTU) 942 goto dropanyway; 943 l = mtod(m, struct llc *); 944 switch (l->llc_dsap) { 945 #ifdef NETATALK 946 case LLC_SNAP_LSAP: 947 switch (l->llc_control) { 948 case LLC_UI: 949 if (l->llc_ssap != LLC_SNAP_LSAP) { 950 goto dropanyway; 951 } 952 953 if (Bcmp(&(l->llc_snap_org_code)[0], 954 at_org_code, sizeof(at_org_code)) == 0 && 955 ntohs(l->llc_snap_ether_type) == 956 ETHERTYPE_ATALK) { 957 inq = &atintrq2; 958 m_adj(m, sizeof(struct llc)); 959 schednetisr(NETISR_ATALK); 960 break; 961 } 962 963 if (Bcmp(&(l->llc_snap_org_code)[0], 964 aarp_org_code, 965 sizeof(aarp_org_code)) == 0 && 966 ntohs(l->llc_snap_ether_type) == 967 ETHERTYPE_AARP) { 968 m_adj( m, sizeof(struct llc)); 969 aarpinput(ifp, m); /* XXX */ 970 return; 971 } 972 973 default: 974 goto dropanyway; 975 } 976 break; 977 #endif /* NETATALK */ 978 #ifdef ISO 979 case LLC_ISO_LSAP: 980 switch (l->llc_control) { 981 case LLC_UI: 982 /* LLC_UI_P forbidden in class 1 service */ 983 if ((l->llc_dsap == LLC_ISO_LSAP) && 984 (l->llc_ssap == LLC_ISO_LSAP)) { 985 /* LSAP for ISO */ 986 if (m->m_pkthdr.len > etype) 987 m_adj(m, etype - m->m_pkthdr.len); 988 m->m_data += 3; /* XXX */ 989 m->m_len -= 3; /* XXX */ 990 m->m_pkthdr.len -= 3; /* XXX */ 991 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 992 if (m == 0) 993 return; 994 *mtod(m, struct ether_header *) = *eh; 995 #ifdef ARGO_DEBUG 996 if (argo_debug[D_ETHER]) 997 printf("clnp packet"); 998 #endif 999 schednetisr(NETISR_ISO); 1000 inq = &clnlintrq; 1001 break; 1002 } 1003 goto dropanyway; 1004 1005 case LLC_XID: 1006 case LLC_XID_P: 1007 if(m->m_len < 6) 1008 goto dropanyway; 1009 l->llc_window = 0; 1010 l->llc_fid = 9; 1011 l->llc_class = 1; 1012 l->llc_dsap = l->llc_ssap = 0; 1013 /* Fall through to */ 1014 case LLC_TEST: 1015 case LLC_TEST_P: 1016 { 1017 struct sockaddr sa; 1018 struct ether_header *eh2; 1019 int i; 1020 u_char c = l->llc_dsap; 1021 1022 l->llc_dsap = l->llc_ssap; 1023 l->llc_ssap = c; 1024 if (m->m_flags & (M_BCAST | M_MCAST)) 1025 bcopy(LLADDR(ifp->if_sadl), 1026 (caddr_t)eh->ether_dhost, 6); 1027 sa.sa_family = AF_UNSPEC; 1028 sa.sa_len = sizeof(sa); 1029 eh2 = (struct ether_header *)sa.sa_data; 1030 for (i = 0; i < 6; i++) { 1031 eh2->ether_shost[i] = c = 1032 eh->ether_dhost[i]; 1033 eh2->ether_dhost[i] = 1034 eh->ether_dhost[i] = 1035 eh->ether_shost[i]; 1036 eh->ether_shost[i] = c; 1037 } 1038 ifp->if_output(ifp, m, &sa, NULL); 1039 return; 1040 } 1041 default: 1042 m_freem(m); 1043 return; 1044 } 1045 break; 1046 #endif /* ISO */ 1047 #ifdef LLC 1048 case LLC_X25_LSAP: 1049 { 1050 if (m->m_pkthdr.len > etype) 1051 m_adj(m, etype - m->m_pkthdr.len); 1052 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 1053 if (m == 0) 1054 return; 1055 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 1056 eh->ether_dhost, LLC_X25_LSAP, 6, 1057 mtod(m, struct sdl_hdr *))) 1058 panic("ETHER cons addr failure"); 1059 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 1060 #ifdef LLC_DEBUG 1061 printf("llc packet\n"); 1062 #endif /* LLC_DEBUG */ 1063 schednetisr(NETISR_CCITT); 1064 inq = &llcintrq; 1065 break; 1066 } 1067 #endif /* LLC */ 1068 dropanyway: 1069 default: 1070 m_freem(m); 1071 return; 1072 } 1073 #else /* ISO || LLC || NETATALK*/ 1074 m_freem(m); 1075 return; 1076 #endif /* ISO || LLC || NETATALK*/ 1077 } 1078 1079 if (IF_QFULL(inq)) { 1080 IF_DROP(inq); 1081 m_freem(m); 1082 } else 1083 IF_ENQUEUE(inq, m); 1084 } 1085 1086 /* 1087 * Convert Ethernet address to printable (loggable) representation. 1088 */ 1089 char * 1090 ether_sprintf(const u_char *ap) 1091 { 1092 static char etherbuf[3 * ETHER_ADDR_LEN]; 1093 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1094 return etherbuf; 1095 } 1096 1097 char * 1098 ether_snprintf(char *buf, size_t len, const u_char *ap) 1099 { 1100 char *cp = buf; 1101 size_t i; 1102 1103 for (i = 0; i < len / 3; i++) { 1104 *cp++ = hexdigits[*ap >> 4]; 1105 *cp++ = hexdigits[*ap++ & 0xf]; 1106 *cp++ = ':'; 1107 } 1108 *--cp = '\0'; 1109 return buf; 1110 } 1111 1112 /* 1113 * Perform common duties while attaching to interface list 1114 */ 1115 void 1116 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1117 { 1118 struct ethercom *ec = (struct ethercom *)ifp; 1119 1120 ifp->if_type = IFT_ETHER; 1121 ifp->if_addrlen = ETHER_ADDR_LEN; 1122 ifp->if_hdrlen = ETHER_HDR_LEN; 1123 ifp->if_dlt = DLT_EN10MB; 1124 ifp->if_mtu = ETHERMTU; 1125 ifp->if_output = ether_output; 1126 ifp->if_input = ether_input; 1127 if (ifp->if_baudrate == 0) 1128 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1129 1130 if_alloc_sadl(ifp); 1131 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1132 1133 LIST_INIT(&ec->ec_multiaddrs); 1134 ifp->if_broadcastaddr = etherbroadcastaddr; 1135 #if NBPFILTER > 0 1136 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1137 #endif 1138 #ifdef MBUFTRACE 1139 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1140 sizeof(ec->ec_tx_mowner.mo_name)); 1141 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1142 sizeof(ec->ec_tx_mowner.mo_descr)); 1143 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1144 sizeof(ec->ec_rx_mowner.mo_name)); 1145 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1146 sizeof(ec->ec_rx_mowner.mo_descr)); 1147 MOWNER_ATTACH(&ec->ec_tx_mowner); 1148 MOWNER_ATTACH(&ec->ec_rx_mowner); 1149 ifp->if_mowner = &ec->ec_tx_mowner; 1150 #endif 1151 } 1152 1153 void 1154 ether_ifdetach(struct ifnet *ifp) 1155 { 1156 struct ethercom *ec = (void *) ifp; 1157 struct ether_multi *enm; 1158 int s; 1159 1160 #if NBRIDGE > 0 1161 if (ifp->if_bridge) 1162 bridge_ifdetach(ifp); 1163 #endif 1164 1165 #if NBPFILTER > 0 1166 bpfdetach(ifp); 1167 #endif 1168 1169 #if NVLAN > 0 1170 if (ec->ec_nvlans) 1171 vlan_ifdetach(ifp); 1172 #endif 1173 1174 s = splnet(); 1175 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1176 LIST_REMOVE(enm, enm_list); 1177 free(enm, M_IFMADDR); 1178 ec->ec_multicnt--; 1179 } 1180 splx(s); 1181 1182 #if 0 /* done in if_detach() */ 1183 if_free_sadl(ifp); 1184 #endif 1185 1186 MOWNER_DETACH(&ec->ec_rx_mowner); 1187 MOWNER_DETACH(&ec->ec_tx_mowner); 1188 } 1189 1190 #if 0 1191 /* 1192 * This is for reference. We have a table-driven version 1193 * of the little-endian crc32 generator, which is faster 1194 * than the double-loop. 1195 */ 1196 u_int32_t 1197 ether_crc32_le(const u_int8_t *buf, size_t len) 1198 { 1199 u_int32_t c, crc, carry; 1200 size_t i, j; 1201 1202 crc = 0xffffffffU; /* initial value */ 1203 1204 for (i = 0; i < len; i++) { 1205 c = buf[i]; 1206 for (j = 0; j < 8; j++) { 1207 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1208 crc >>= 1; 1209 c >>= 1; 1210 if (carry) 1211 crc = (crc ^ ETHER_CRC_POLY_LE); 1212 } 1213 } 1214 1215 return (crc); 1216 } 1217 #else 1218 u_int32_t 1219 ether_crc32_le(const u_int8_t *buf, size_t len) 1220 { 1221 static const u_int32_t crctab[] = { 1222 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1223 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1224 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1225 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1226 }; 1227 u_int32_t crc; 1228 size_t i; 1229 1230 crc = 0xffffffffU; /* initial value */ 1231 1232 for (i = 0; i < len; i++) { 1233 crc ^= buf[i]; 1234 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1235 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1236 } 1237 1238 return (crc); 1239 } 1240 #endif 1241 1242 u_int32_t 1243 ether_crc32_be(const u_int8_t *buf, size_t len) 1244 { 1245 u_int32_t c, crc, carry; 1246 size_t i, j; 1247 1248 crc = 0xffffffffU; /* initial value */ 1249 1250 for (i = 0; i < len; i++) { 1251 c = buf[i]; 1252 for (j = 0; j < 8; j++) { 1253 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1254 crc <<= 1; 1255 c >>= 1; 1256 if (carry) 1257 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1258 } 1259 } 1260 1261 return (crc); 1262 } 1263 1264 #ifdef INET 1265 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1266 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1267 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1268 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1269 #endif 1270 #ifdef INET6 1271 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1272 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1273 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1274 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1275 #endif 1276 1277 /* 1278 * Convert a sockaddr into an Ethernet address or range of Ethernet 1279 * addresses. 1280 */ 1281 int 1282 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1283 u_int8_t addrhi[ETHER_ADDR_LEN]) 1284 { 1285 #ifdef INET 1286 struct sockaddr_in *sin; 1287 #endif /* INET */ 1288 #ifdef INET6 1289 struct sockaddr_in6 *sin6; 1290 #endif /* INET6 */ 1291 1292 switch (sa->sa_family) { 1293 1294 case AF_UNSPEC: 1295 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1296 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1297 break; 1298 1299 #ifdef INET 1300 case AF_INET: 1301 sin = satosin(sa); 1302 if (sin->sin_addr.s_addr == INADDR_ANY) { 1303 /* 1304 * An IP address of INADDR_ANY means listen to 1305 * or stop listening to all of the Ethernet 1306 * multicast addresses used for IP. 1307 * (This is for the sake of IP multicast routers.) 1308 */ 1309 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1310 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1311 } 1312 else { 1313 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1314 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1315 } 1316 break; 1317 #endif 1318 #ifdef INET6 1319 case AF_INET6: 1320 sin6 = satosin6(sa); 1321 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1322 /* 1323 * An IP6 address of 0 means listen to or stop 1324 * listening to all of the Ethernet multicast 1325 * address used for IP6. 1326 * (This is used for multicast routers.) 1327 */ 1328 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1329 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1330 } else { 1331 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1332 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1333 } 1334 break; 1335 #endif 1336 1337 default: 1338 return (EAFNOSUPPORT); 1339 } 1340 return (0); 1341 } 1342 1343 /* 1344 * Add an Ethernet multicast address or range of addresses to the list for a 1345 * given interface. 1346 */ 1347 int 1348 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1349 { 1350 struct ether_multi *enm; 1351 u_char addrlo[ETHER_ADDR_LEN]; 1352 u_char addrhi[ETHER_ADDR_LEN]; 1353 int s = splnet(), error; 1354 1355 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1356 if (error != 0) { 1357 splx(s); 1358 return (error); 1359 } 1360 1361 /* 1362 * Verify that we have valid Ethernet multicast addresses. 1363 */ 1364 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1365 splx(s); 1366 return (EINVAL); 1367 } 1368 /* 1369 * See if the address range is already in the list. 1370 */ 1371 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1372 if (enm != NULL) { 1373 /* 1374 * Found it; just increment the reference count. 1375 */ 1376 ++enm->enm_refcount; 1377 splx(s); 1378 return (0); 1379 } 1380 /* 1381 * New address or range; malloc a new multicast record 1382 * and link it into the interface's multicast list. 1383 */ 1384 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1385 if (enm == NULL) { 1386 splx(s); 1387 return (ENOBUFS); 1388 } 1389 bcopy(addrlo, enm->enm_addrlo, 6); 1390 bcopy(addrhi, enm->enm_addrhi, 6); 1391 enm->enm_refcount = 1; 1392 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1393 ec->ec_multicnt++; 1394 splx(s); 1395 /* 1396 * Return ENETRESET to inform the driver that the list has changed 1397 * and its reception filter should be adjusted accordingly. 1398 */ 1399 return (ENETRESET); 1400 } 1401 1402 /* 1403 * Delete a multicast address record. 1404 */ 1405 int 1406 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1407 { 1408 struct ether_multi *enm; 1409 u_char addrlo[ETHER_ADDR_LEN]; 1410 u_char addrhi[ETHER_ADDR_LEN]; 1411 int s = splnet(), error; 1412 1413 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1414 if (error != 0) { 1415 splx(s); 1416 return (error); 1417 } 1418 1419 /* 1420 * Look ur the address in our list. 1421 */ 1422 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1423 if (enm == NULL) { 1424 splx(s); 1425 return (ENXIO); 1426 } 1427 if (--enm->enm_refcount != 0) { 1428 /* 1429 * Still some claims to this record. 1430 */ 1431 splx(s); 1432 return (0); 1433 } 1434 /* 1435 * No remaining claims to this record; unlink and free it. 1436 */ 1437 LIST_REMOVE(enm, enm_list); 1438 free(enm, M_IFMADDR); 1439 ec->ec_multicnt--; 1440 splx(s); 1441 /* 1442 * Return ENETRESET to inform the driver that the list has changed 1443 * and its reception filter should be adjusted accordingly. 1444 */ 1445 return (ENETRESET); 1446 } 1447 1448 /* 1449 * Common ioctls for Ethernet interfaces. Note, we must be 1450 * called at splnet(). 1451 */ 1452 int 1453 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1454 { 1455 struct ethercom *ec = (void *) ifp; 1456 struct ifreq *ifr = (struct ifreq *)data; 1457 struct ifaddr *ifa = (struct ifaddr *)data; 1458 int error = 0; 1459 1460 switch (cmd) { 1461 case SIOCSIFADDR: 1462 ifp->if_flags |= IFF_UP; 1463 switch (ifa->ifa_addr->sa_family) { 1464 case AF_LINK: 1465 { 1466 struct sockaddr_dl *sdl = 1467 (struct sockaddr_dl *) ifa->ifa_addr; 1468 1469 if (sdl->sdl_type != IFT_ETHER || 1470 sdl->sdl_alen != ifp->if_addrlen) { 1471 error = EINVAL; 1472 break; 1473 } 1474 1475 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1476 ifp->if_addrlen); 1477 1478 /* Set new address. */ 1479 error = (*ifp->if_init)(ifp); 1480 break; 1481 } 1482 #ifdef INET 1483 case AF_INET: 1484 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1485 (error = (*ifp->if_init)(ifp)) != 0) 1486 break; 1487 arp_ifinit(ifp, ifa); 1488 break; 1489 #endif /* INET */ 1490 #ifdef NS 1491 case AF_NS: 1492 { 1493 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1494 1495 if (ns_nullhost(*ina)) 1496 ina->x_host = *(union ns_host *) 1497 LLADDR(ifp->if_sadl); 1498 else 1499 memcpy(LLADDR(ifp->if_sadl), 1500 ina->x_host.c_host, ifp->if_addrlen); 1501 /* Set new address. */ 1502 error = (*ifp->if_init)(ifp); 1503 break; 1504 } 1505 #endif /* NS */ 1506 default: 1507 if ((ifp->if_flags & IFF_RUNNING) == 0) 1508 error = (*ifp->if_init)(ifp); 1509 break; 1510 } 1511 break; 1512 1513 case SIOCGIFADDR: 1514 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1515 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1516 break; 1517 1518 case SIOCSIFMTU: 1519 { 1520 int maxmtu; 1521 1522 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1523 maxmtu = ETHERMTU_JUMBO; 1524 else 1525 maxmtu = ETHERMTU; 1526 1527 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1528 error = EINVAL; 1529 else { 1530 ifp->if_mtu = ifr->ifr_mtu; 1531 1532 /* Make sure the device notices the MTU change. */ 1533 if (ifp->if_flags & IFF_UP) 1534 error = (*ifp->if_init)(ifp); 1535 } 1536 break; 1537 } 1538 1539 case SIOCSIFFLAGS: 1540 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1541 /* 1542 * If interface is marked down and it is running, 1543 * then stop and disable it. 1544 */ 1545 (*ifp->if_stop)(ifp, 1); 1546 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1547 /* 1548 * If interface is marked up and it is stopped, then 1549 * start it. 1550 */ 1551 error = (*ifp->if_init)(ifp); 1552 } else if ((ifp->if_flags & IFF_UP) != 0) { 1553 /* 1554 * Reset the interface to pick up changes in any other 1555 * flags that affect the hardware state. 1556 */ 1557 error = (*ifp->if_init)(ifp); 1558 } 1559 break; 1560 1561 case SIOCADDMULTI: 1562 error = ether_addmulti(ifr, ec); 1563 break; 1564 1565 case SIOCDELMULTI: 1566 error = ether_delmulti(ifr, ec); 1567 break; 1568 1569 default: 1570 error = ENOTTY; 1571 } 1572 1573 return (error); 1574 } 1575
Indexes created Tue Sep 30 10:09:55 GMT 2025