if_ethersubr.c revision 1.122
1 /* $NetBSD: if_ethersubr.c,v 1.122 2005/03/31 15:48:13 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 1.122 2005/03/31 15:48:13 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 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 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 187 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 188 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 189 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 190 #define senderr(e) { error = (e); goto bad;} 191 192 #define SIN(x) ((struct sockaddr_in *)x) 193 194 static int ether_output __P((struct ifnet *, struct mbuf *, 195 struct sockaddr *, struct rtentry *)); 196 static void ether_input __P((struct ifnet *, struct mbuf *)); 197 198 /* 199 * Ethernet output routine. 200 * Encapsulate a packet of type family for the local net. 201 * Assumes that ifp is actually pointer to ethercom structure. 202 */ 203 static int 204 ether_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 205 struct rtentry *rt0) 206 { 207 u_int16_t etype = 0; 208 int error = 0, hdrcmplt = 0; 209 u_char esrc[6], edst[6]; 210 struct mbuf *m = m0; 211 struct rtentry *rt; 212 struct mbuf *mcopy = (struct mbuf *)0; 213 struct ether_header *eh; 214 ALTQ_DECL(struct altq_pktattr pktattr;) 215 #ifdef INET 216 struct arphdr *ah; 217 #endif /* INET */ 218 #ifdef NETATALK 219 struct at_ifaddr *aa; 220 #endif /* NETATALK */ 221 222 #ifdef MBUFTRACE 223 m_claimm(m, ifp->if_mowner); 224 #endif 225 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 226 senderr(ENETDOWN); 227 if ((rt = rt0) != NULL) { 228 if ((rt->rt_flags & RTF_UP) == 0) { 229 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 230 rt->rt_refcnt--; 231 if (rt->rt_ifp != ifp) 232 return (*rt->rt_ifp->if_output) 233 (ifp, m0, dst, rt); 234 } else 235 senderr(EHOSTUNREACH); 236 } 237 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 238 if (rt->rt_gwroute == 0) 239 goto lookup; 240 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 241 rtfree(rt); rt = rt0; 242 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 243 if ((rt = rt->rt_gwroute) == 0) 244 senderr(EHOSTUNREACH); 245 /* the "G" test below also prevents rt == rt0 */ 246 if ((rt->rt_flags & RTF_GATEWAY) || 247 (rt->rt_ifp != ifp)) { 248 rt->rt_refcnt--; 249 rt0->rt_gwroute = 0; 250 senderr(EHOSTUNREACH); 251 } 252 } 253 } 254 if (rt->rt_flags & RTF_REJECT) 255 if (rt->rt_rmx.rmx_expire == 0 || 256 (u_long) time.tv_sec < rt->rt_rmx.rmx_expire) 257 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 258 } 259 260 switch (dst->sa_family) { 261 262 #ifdef INET 263 case AF_INET: 264 if (m->m_flags & M_BCAST) 265 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 266 sizeof(edst)); 267 268 else if (m->m_flags & M_MCAST) { 269 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 270 (caddr_t)edst) 271 272 } else if (!arpresolve(ifp, rt, m, dst, edst)) 273 return (0); /* if not yet resolved */ 274 /* If broadcasting on a simplex interface, loopback a copy */ 275 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 276 mcopy = m_copy(m, 0, (int)M_COPYALL); 277 etype = htons(ETHERTYPE_IP); 278 break; 279 280 case AF_ARP: 281 ah = mtod(m, struct arphdr *); 282 if (m->m_flags & M_BCAST) 283 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)edst, 284 sizeof(edst)); 285 else 286 bcopy((caddr_t)ar_tha(ah), 287 (caddr_t)edst, sizeof(edst)); 288 289 ah->ar_hrd = htons(ARPHRD_ETHER); 290 291 switch (ntohs(ah->ar_op)) { 292 case ARPOP_REVREQUEST: 293 case ARPOP_REVREPLY: 294 etype = htons(ETHERTYPE_REVARP); 295 break; 296 297 case ARPOP_REQUEST: 298 case ARPOP_REPLY: 299 default: 300 etype = htons(ETHERTYPE_ARP); 301 } 302 303 break; 304 #endif 305 #ifdef INET6 306 case AF_INET6: 307 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 308 /* something bad happened */ 309 return (0); 310 } 311 etype = htons(ETHERTYPE_IPV6); 312 break; 313 #endif 314 #ifdef NETATALK 315 case AF_APPLETALK: 316 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 317 #ifdef NETATALKDEBUG 318 printf("aarpresolv failed\n"); 319 #endif /* NETATALKDEBUG */ 320 return (0); 321 } 322 /* 323 * ifaddr is the first thing in at_ifaddr 324 */ 325 aa = (struct at_ifaddr *) at_ifawithnet( 326 (struct sockaddr_at *)dst, ifp); 327 if (aa == NULL) 328 goto bad; 329 330 /* 331 * In the phase 2 case, we need to prepend an mbuf for the 332 * llc header. Since we must preserve the value of m, 333 * which is passed to us by value, we m_copy() the first 334 * mbuf, and use it for our llc header. 335 */ 336 if (aa->aa_flags & AFA_PHASE2) { 337 struct llc llc; 338 339 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 340 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 341 llc.llc_control = LLC_UI; 342 bcopy(at_org_code, llc.llc_snap_org_code, 343 sizeof(llc.llc_snap_org_code)); 344 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 345 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 346 } else { 347 etype = htons(ETHERTYPE_ATALK); 348 } 349 break; 350 #endif /* NETATALK */ 351 #ifdef NS 352 case AF_NS: 353 etype = htons(ETHERTYPE_NS); 354 bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), 355 (caddr_t)edst, sizeof (edst)); 356 if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))) 357 return (looutput(ifp, m, dst, rt)); 358 /* If broadcasting on a simplex interface, loopback a copy */ 359 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 360 mcopy = m_copy(m, 0, (int)M_COPYALL); 361 break; 362 #endif 363 #ifdef IPX 364 case AF_IPX: 365 etype = htons(ETHERTYPE_IPX); 366 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 367 (caddr_t)edst, sizeof (edst)); 368 /* If broadcasting on a simplex interface, loopback a copy */ 369 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 370 mcopy = m_copy(m, 0, (int)M_COPYALL); 371 break; 372 #endif 373 #ifdef ISO 374 case AF_ISO: { 375 int snpalen; 376 struct llc *l; 377 struct sockaddr_dl *sdl; 378 379 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 380 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 381 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 382 } else { 383 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 384 (char *)edst, &snpalen); 385 if (error) 386 goto bad; /* Not Resolved */ 387 } 388 /* If broadcasting on a simplex interface, loopback a copy */ 389 if (*edst & 1) 390 m->m_flags |= (M_BCAST|M_MCAST); 391 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 392 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 393 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 394 if (mcopy) { 395 eh = mtod(mcopy, struct ether_header *); 396 bcopy((caddr_t)edst, 397 (caddr_t)eh->ether_dhost, sizeof (edst)); 398 bcopy(LLADDR(ifp->if_sadl), 399 (caddr_t)eh->ether_shost, sizeof (edst)); 400 } 401 } 402 M_PREPEND(m, 3, M_DONTWAIT); 403 if (m == NULL) 404 return (0); 405 l = mtod(m, struct llc *); 406 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 407 l->llc_control = LLC_UI; 408 #ifdef ARGO_DEBUG 409 if (argo_debug[D_ETHER]) { 410 int i; 411 printf("unoutput: sending pkt to: "); 412 for (i=0; i<6; i++) 413 printf("%x ", edst[i] & 0xff); 414 printf("\n"); 415 } 416 #endif 417 } break; 418 #endif /* ISO */ 419 #ifdef LLC 420 /* case AF_NSAP: */ 421 case AF_CCITT: { 422 struct sockaddr_dl *sdl = 423 (struct sockaddr_dl *) rt -> rt_gateway; 424 425 if (sdl && sdl->sdl_family == AF_LINK 426 && sdl->sdl_alen > 0) { 427 bcopy(LLADDR(sdl), (char *)edst, 428 sizeof(edst)); 429 } else goto bad; /* Not a link interface ? Funny ... */ 430 if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) && 431 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 432 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 433 if (mcopy) { 434 eh = mtod(mcopy, struct ether_header *); 435 bcopy((caddr_t)edst, 436 (caddr_t)eh->ether_dhost, sizeof (edst)); 437 bcopy(LLADDR(ifp->if_sadl), 438 (caddr_t)eh->ether_shost, sizeof (edst)); 439 } 440 } 441 #ifdef LLC_DEBUG 442 { 443 int i; 444 struct llc *l = mtod(m, struct llc *); 445 446 printf("ether_output: sending LLC2 pkt to: "); 447 for (i=0; i<6; i++) 448 printf("%x ", edst[i] & 0xff); 449 printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", 450 m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff, 451 l->llc_control & 0xff); 452 453 } 454 #endif /* LLC_DEBUG */ 455 } break; 456 #endif /* LLC */ 457 458 case pseudo_AF_HDRCMPLT: 459 hdrcmplt = 1; 460 eh = (struct ether_header *)dst->sa_data; 461 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 462 /* FALLTHROUGH */ 463 464 case AF_UNSPEC: 465 eh = (struct ether_header *)dst->sa_data; 466 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 467 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 468 etype = eh->ether_type; 469 break; 470 471 default: 472 printf("%s: can't handle af%d\n", ifp->if_xname, 473 dst->sa_family); 474 senderr(EAFNOSUPPORT); 475 } 476 477 if (mcopy) 478 (void) looutput(ifp, mcopy, dst, rt); 479 480 /* If no ether type is set, this must be a 802.2 formatted packet. 481 */ 482 if (etype == 0) 483 etype = htons(m->m_pkthdr.len); 484 /* 485 * Add local net header. If no space in first mbuf, 486 * allocate another. 487 */ 488 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 489 if (m == 0) 490 senderr(ENOBUFS); 491 eh = mtod(m, struct ether_header *); 492 /* Note: etype is already in network byte order. */ 493 #ifdef __NO_STRICT_ALIGNMENT 494 eh->ether_type = etype; 495 #else 496 { 497 uint8_t *dstp = (uint8_t *) &eh->ether_type; 498 #if BYTE_ORDER == BIG_ENDIAN 499 dstp[0] = etype >> 8; 500 dstp[1] = etype; 501 #else 502 dstp[0] = etype; 503 dstp[1] = etype >> 8; 504 #endif /* BYTE_ORDER == BIG_ENDIAN */ 505 } 506 #endif /* __NO_STRICT_ALIGNMENT */ 507 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 508 if (hdrcmplt) 509 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 510 sizeof(eh->ether_shost)); 511 else 512 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 513 sizeof(eh->ether_shost)); 514 515 #ifdef PFIL_HOOKS 516 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 517 return (error); 518 if (m == NULL) 519 return (0); 520 #endif 521 522 #if NBRIDGE > 0 523 /* 524 * Bridges require special output handling. 525 */ 526 if (ifp->if_bridge) 527 return (bridge_output(ifp, m, NULL, NULL)); 528 #endif 529 530 #ifdef ALTQ 531 /* 532 * If ALTQ is enabled on the parent interface, do 533 * classification; the queueing discipline might not 534 * require classification, but might require the 535 * address family/header pointer in the pktattr. 536 */ 537 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 538 altq_etherclassify(&ifp->if_snd, m, &pktattr); 539 #endif 540 541 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 542 543 bad: 544 if (m) 545 m_freem(m); 546 return (error); 547 } 548 549 #ifdef ALTQ 550 /* 551 * This routine is a slight hack to allow a packet to be classified 552 * if the Ethernet headers are present. It will go away when ALTQ's 553 * classification engine understands link headers. 554 */ 555 void 556 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 557 struct altq_pktattr *pktattr) 558 { 559 struct ether_header *eh; 560 u_int16_t ether_type; 561 int hlen, af, hdrsize; 562 caddr_t hdr; 563 564 hlen = ETHER_HDR_LEN; 565 eh = mtod(m, struct ether_header *); 566 567 ether_type = htons(eh->ether_type); 568 569 if (ether_type < ETHERMTU) { 570 /* LLC/SNAP */ 571 struct llc *llc = (struct llc *)(eh + 1); 572 hlen += 8; 573 574 if (m->m_len < hlen || 575 llc->llc_dsap != LLC_SNAP_LSAP || 576 llc->llc_ssap != LLC_SNAP_LSAP || 577 llc->llc_control != LLC_UI) { 578 /* Not SNAP. */ 579 goto bad; 580 } 581 582 ether_type = htons(llc->llc_un.type_snap.ether_type); 583 } 584 585 switch (ether_type) { 586 case ETHERTYPE_IP: 587 af = AF_INET; 588 hdrsize = 20; /* sizeof(struct ip) */ 589 break; 590 591 case ETHERTYPE_IPV6: 592 af = AF_INET6; 593 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 594 break; 595 596 default: 597 af = AF_UNSPEC; 598 hdrsize = 0; 599 break; 600 } 601 602 while (m->m_len <= hlen) { 603 hlen -= m->m_len; 604 m = m->m_next; 605 } 606 if (m->m_len < (hlen + hdrsize)) { 607 /* 608 * protocol header not in a single mbuf. 609 * We can't cope with this situation right 610 * now (but it shouldn't ever happen, really, anyhow). 611 */ 612 #ifdef DEBUG 613 printf("altq_etherclassify: headers span multiple mbufs: " 614 "%d < %d\n", m->m_len, (hlen + hdrsize)); 615 #endif 616 goto bad; 617 } 618 619 m->m_data += hlen; 620 m->m_len -= hlen; 621 622 hdr = mtod(m, caddr_t); 623 624 if (ALTQ_NEEDS_CLASSIFY(ifq)) 625 pktattr->pattr_class = 626 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 627 pktattr->pattr_af = af; 628 pktattr->pattr_hdr = hdr; 629 630 m->m_data -= hlen; 631 m->m_len += hlen; 632 633 return; 634 635 bad: 636 pktattr->pattr_class = NULL; 637 pktattr->pattr_hdr = NULL; 638 pktattr->pattr_af = AF_UNSPEC; 639 } 640 #endif /* ALTQ */ 641 642 /* 643 * Process a received Ethernet packet; 644 * the packet is in the mbuf chain m with 645 * the ether header. 646 */ 647 static void 648 ether_input(struct ifnet *ifp, struct mbuf *m) 649 { 650 struct ethercom *ec = (struct ethercom *) ifp; 651 struct ifqueue *inq; 652 u_int16_t etype; 653 int s; 654 struct ether_header *eh; 655 #if defined (ISO) || defined (LLC) || defined(NETATALK) 656 struct llc *l; 657 #endif 658 659 if ((ifp->if_flags & IFF_UP) == 0) { 660 m_freem(m); 661 return; 662 } 663 664 #ifdef MBUFTRACE 665 m_claimm(m, &ec->ec_rx_mowner); 666 #endif 667 eh = mtod(m, struct ether_header *); 668 etype = ntohs(eh->ether_type); 669 670 /* 671 * Determine if the packet is within its size limits. 672 */ 673 if (m->m_pkthdr.len > 674 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 675 printf("%s: discarding oversize frame (len=%d)\n", 676 ifp->if_xname, m->m_pkthdr.len); 677 m_freem(m); 678 return; 679 } 680 681 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 682 /* 683 * If this is not a simplex interface, drop the packet 684 * if it came from us. 685 */ 686 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 687 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 688 ETHER_ADDR_LEN) == 0) { 689 m_freem(m); 690 return; 691 } 692 693 if (memcmp(etherbroadcastaddr, 694 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 695 m->m_flags |= M_BCAST; 696 else 697 m->m_flags |= M_MCAST; 698 ifp->if_imcasts++; 699 } 700 701 /* If the CRC is still on the packet, trim it off. */ 702 if (m->m_flags & M_HASFCS) { 703 m_adj(m, -ETHER_CRC_LEN); 704 m->m_flags &= ~M_HASFCS; 705 } 706 707 ifp->if_ibytes += m->m_pkthdr.len; 708 709 #if NBRIDGE > 0 710 /* 711 * Tap the packet off here for a bridge. bridge_input() 712 * will return NULL if it has consumed the packet, otherwise 713 * it gets processed as normal. Note that bridge_input() 714 * will always return the original packet if we need to 715 * process it locally. 716 */ 717 if (ifp->if_bridge) { 718 if(m->m_flags & M_PROTO1) { 719 m->m_flags &= ~M_PROTO1; 720 } else { 721 /* clear M_PROMISC, in case the packets comes from a vlan */ 722 m->m_flags &= ~M_PROMISC; 723 m = bridge_input(ifp, m); 724 if (m == NULL) 725 return; 726 727 /* 728 * Bridge has determined that the packet is for us. 729 * Update our interface pointer -- we may have had 730 * to "bridge" the packet locally. 731 */ 732 ifp = m->m_pkthdr.rcvif; 733 } 734 } else 735 #endif /* NBRIDGE > 0 */ 736 { 737 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 738 (ifp->if_flags & IFF_PROMISC) != 0 && 739 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 740 ETHER_ADDR_LEN) != 0) { 741 m->m_flags |= M_PROMISC; 742 } 743 } 744 745 #ifdef PFIL_HOOKS 746 if ((m->m_flags & M_PROMISC) == 0) { 747 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 748 return; 749 if (m == NULL) 750 return; 751 752 eh = mtod(m, struct ether_header *); 753 etype = ntohs(eh->ether_type); 754 } 755 #endif 756 757 /* 758 * If VLANs are configured on the interface, check to 759 * see if the device performed the decapsulation and 760 * provided us with the tag. 761 */ 762 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 763 #if NVLAN > 0 764 /* 765 * vlan_input() will either recursively call ether_input() 766 * or drop the packet. 767 */ 768 vlan_input(ifp, m); 769 #else 770 m_freem(m); 771 #endif 772 return; 773 } 774 775 #if NAGR > 0 776 if (ifp->if_agrprivate && 777 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 778 m->m_flags &= ~M_PROMISC; 779 agr_input(ifp, m); 780 return; 781 } 782 #endif /* NAGR > 0 */ 783 784 /* 785 * Handle protocols that expect to have the Ethernet header 786 * (and possibly FCS) intact. 787 */ 788 switch (etype) { 789 #if NVLAN > 0 790 case ETHERTYPE_VLAN: 791 /* 792 * vlan_input() will either recursively call ether_input() 793 * or drop the packet. 794 */ 795 if (((struct ethercom *)ifp)->ec_nvlans != 0) 796 vlan_input(ifp, m); 797 else 798 m_freem(m); 799 return; 800 #endif /* NVLAN > 0 */ 801 #if NPPPOE > 0 802 case ETHERTYPE_PPPOEDISC: 803 case ETHERTYPE_PPPOE: 804 if (m->m_flags & M_PROMISC) { 805 m_freem(m); 806 return; 807 } 808 #ifndef PPPOE_SERVER 809 if (m->m_flags & (M_MCAST | M_BCAST)) { 810 m_freem(m); 811 return; 812 } 813 #endif 814 815 if (etype == ETHERTYPE_PPPOEDISC) 816 inq = &ppoediscinq; 817 else 818 inq = &ppoeinq; 819 s = splnet(); 820 if (IF_QFULL(inq)) { 821 IF_DROP(inq); 822 m_freem(m); 823 } else 824 IF_ENQUEUE(inq, m); 825 splx(s); 826 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 827 if (!callout_pending(&pppoe_softintr)) 828 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 829 #else 830 softintr_schedule(pppoe_softintr); 831 #endif 832 return; 833 #endif /* NPPPOE > 0 */ 834 case ETHERTYPE_SLOWPROTOCOLS: { 835 uint8_t subtype; 836 837 #if defined(DIAGNOSTIC) 838 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 839 panic("ether_input: too short slow protocol packet"); 840 } 841 #endif 842 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 843 switch (subtype) { 844 #if NAGR > 0 845 case SLOWPROTOCOLS_SUBTYPE_LACP: 846 if (ifp->if_agrprivate) { 847 ieee8023ad_lacp_input(ifp, m); 848 return; 849 } 850 break; 851 852 case SLOWPROTOCOLS_SUBTYPE_MARKER: 853 if (ifp->if_agrprivate) { 854 ieee8023ad_marker_input(ifp, m); 855 return; 856 } 857 break; 858 #endif /* NAGR > 0 */ 859 default: 860 if (subtype == 0 || subtype > 10) { 861 /* illegal value */ 862 m_freem(m); 863 return; 864 } 865 /* unknown subtype */ 866 break; 867 } 868 /* FALLTHROUGH */ 869 } 870 default: 871 if (m->m_flags & M_PROMISC) { 872 m_freem(m); 873 return; 874 } 875 } 876 877 /* Strip off the Ethernet header. */ 878 m_adj(m, sizeof(struct ether_header)); 879 880 /* If the CRC is still on the packet, trim it off. */ 881 if (m->m_flags & M_HASFCS) { 882 m_adj(m, -ETHER_CRC_LEN); 883 m->m_flags &= ~M_HASFCS; 884 } 885 886 switch (etype) { 887 #ifdef INET 888 case ETHERTYPE_IP: 889 #ifdef GATEWAY 890 if (ipflow_fastforward(m)) 891 return; 892 #endif 893 schednetisr(NETISR_IP); 894 inq = &ipintrq; 895 break; 896 897 case ETHERTYPE_ARP: 898 schednetisr(NETISR_ARP); 899 inq = &arpintrq; 900 break; 901 902 case ETHERTYPE_REVARP: 903 revarpinput(m); /* XXX queue? */ 904 return; 905 #endif 906 #ifdef INET6 907 case ETHERTYPE_IPV6: 908 schednetisr(NETISR_IPV6); 909 inq = &ip6intrq; 910 break; 911 #endif 912 #ifdef NS 913 case ETHERTYPE_NS: 914 schednetisr(NETISR_NS); 915 inq = &nsintrq; 916 break; 917 918 #endif 919 #ifdef IPX 920 case ETHERTYPE_IPX: 921 schednetisr(NETISR_IPX); 922 inq = &ipxintrq; 923 break; 924 #endif 925 #ifdef NETATALK 926 case ETHERTYPE_ATALK: 927 schednetisr(NETISR_ATALK); 928 inq = &atintrq1; 929 break; 930 case ETHERTYPE_AARP: 931 /* probably this should be done with a NETISR as well */ 932 aarpinput(ifp, m); /* XXX */ 933 return; 934 #endif /* NETATALK */ 935 default: 936 #if defined (ISO) || defined (LLC) || defined (NETATALK) 937 if (etype > ETHERMTU) 938 goto dropanyway; 939 l = mtod(m, struct llc *); 940 switch (l->llc_dsap) { 941 #ifdef NETATALK 942 case LLC_SNAP_LSAP: 943 switch (l->llc_control) { 944 case LLC_UI: 945 if (l->llc_ssap != LLC_SNAP_LSAP) { 946 goto dropanyway; 947 } 948 949 if (Bcmp(&(l->llc_snap_org_code)[0], 950 at_org_code, sizeof(at_org_code)) == 0 && 951 ntohs(l->llc_snap_ether_type) == 952 ETHERTYPE_ATALK) { 953 inq = &atintrq2; 954 m_adj(m, sizeof(struct llc)); 955 schednetisr(NETISR_ATALK); 956 break; 957 } 958 959 if (Bcmp(&(l->llc_snap_org_code)[0], 960 aarp_org_code, 961 sizeof(aarp_org_code)) == 0 && 962 ntohs(l->llc_snap_ether_type) == 963 ETHERTYPE_AARP) { 964 m_adj( m, sizeof(struct llc)); 965 aarpinput(ifp, m); /* XXX */ 966 return; 967 } 968 969 default: 970 goto dropanyway; 971 } 972 break; 973 #endif /* NETATALK */ 974 #ifdef ISO 975 case LLC_ISO_LSAP: 976 switch (l->llc_control) { 977 case LLC_UI: 978 /* LLC_UI_P forbidden in class 1 service */ 979 if ((l->llc_dsap == LLC_ISO_LSAP) && 980 (l->llc_ssap == LLC_ISO_LSAP)) { 981 /* LSAP for ISO */ 982 if (m->m_pkthdr.len > etype) 983 m_adj(m, etype - m->m_pkthdr.len); 984 m->m_data += 3; /* XXX */ 985 m->m_len -= 3; /* XXX */ 986 m->m_pkthdr.len -= 3; /* XXX */ 987 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 988 if (m == 0) 989 return; 990 *mtod(m, struct ether_header *) = *eh; 991 #ifdef ARGO_DEBUG 992 if (argo_debug[D_ETHER]) 993 printf("clnp packet"); 994 #endif 995 schednetisr(NETISR_ISO); 996 inq = &clnlintrq; 997 break; 998 } 999 goto dropanyway; 1000 1001 case LLC_XID: 1002 case LLC_XID_P: 1003 if(m->m_len < 6) 1004 goto dropanyway; 1005 l->llc_window = 0; 1006 l->llc_fid = 9; 1007 l->llc_class = 1; 1008 l->llc_dsap = l->llc_ssap = 0; 1009 /* Fall through to */ 1010 case LLC_TEST: 1011 case LLC_TEST_P: 1012 { 1013 struct sockaddr sa; 1014 struct ether_header *eh2; 1015 int i; 1016 u_char c = l->llc_dsap; 1017 1018 l->llc_dsap = l->llc_ssap; 1019 l->llc_ssap = c; 1020 if (m->m_flags & (M_BCAST | M_MCAST)) 1021 bcopy(LLADDR(ifp->if_sadl), 1022 (caddr_t)eh->ether_dhost, 6); 1023 sa.sa_family = AF_UNSPEC; 1024 sa.sa_len = sizeof(sa); 1025 eh2 = (struct ether_header *)sa.sa_data; 1026 for (i = 0; i < 6; i++) { 1027 eh2->ether_shost[i] = c = 1028 eh->ether_dhost[i]; 1029 eh2->ether_dhost[i] = 1030 eh->ether_dhost[i] = 1031 eh->ether_shost[i]; 1032 eh->ether_shost[i] = c; 1033 } 1034 ifp->if_output(ifp, m, &sa, NULL); 1035 return; 1036 } 1037 default: 1038 m_freem(m); 1039 return; 1040 } 1041 break; 1042 #endif /* ISO */ 1043 #ifdef LLC 1044 case LLC_X25_LSAP: 1045 { 1046 if (m->m_pkthdr.len > etype) 1047 m_adj(m, etype - m->m_pkthdr.len); 1048 M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); 1049 if (m == 0) 1050 return; 1051 if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, 1052 eh->ether_dhost, LLC_X25_LSAP, 6, 1053 mtod(m, struct sdl_hdr *))) 1054 panic("ETHER cons addr failure"); 1055 mtod(m, struct sdl_hdr *)->sdlhdr_len = etype; 1056 #ifdef LLC_DEBUG 1057 printf("llc packet\n"); 1058 #endif /* LLC_DEBUG */ 1059 schednetisr(NETISR_CCITT); 1060 inq = &llcintrq; 1061 break; 1062 } 1063 #endif /* LLC */ 1064 dropanyway: 1065 default: 1066 m_freem(m); 1067 return; 1068 } 1069 #else /* ISO || LLC || NETATALK*/ 1070 m_freem(m); 1071 return; 1072 #endif /* ISO || LLC || NETATALK*/ 1073 } 1074 1075 s = splnet(); 1076 if (IF_QFULL(inq)) { 1077 IF_DROP(inq); 1078 m_freem(m); 1079 } else 1080 IF_ENQUEUE(inq, m); 1081 splx(s); 1082 } 1083 1084 /* 1085 * Convert Ethernet address to printable (loggable) representation. 1086 */ 1087 static char digits[] = "0123456789abcdef"; 1088 char * 1089 ether_sprintf(const u_char *ap) 1090 { 1091 static char etherbuf[18]; 1092 char *cp = etherbuf; 1093 int i; 1094 1095 for (i = 0; i < 6; i++) { 1096 *cp++ = digits[*ap >> 4]; 1097 *cp++ = digits[*ap++ & 0xf]; 1098 *cp++ = ':'; 1099 } 1100 *--cp = 0; 1101 return (etherbuf); 1102 } 1103 1104 /* 1105 * Perform common duties while attaching to interface list 1106 */ 1107 void 1108 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1109 { 1110 struct ethercom *ec = (struct ethercom *)ifp; 1111 1112 ifp->if_type = IFT_ETHER; 1113 ifp->if_addrlen = ETHER_ADDR_LEN; 1114 ifp->if_hdrlen = ETHER_HDR_LEN; 1115 ifp->if_dlt = DLT_EN10MB; 1116 ifp->if_mtu = ETHERMTU; 1117 ifp->if_output = ether_output; 1118 ifp->if_input = ether_input; 1119 if (ifp->if_baudrate == 0) 1120 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1121 1122 if_alloc_sadl(ifp); 1123 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1124 1125 LIST_INIT(&ec->ec_multiaddrs); 1126 ifp->if_broadcastaddr = etherbroadcastaddr; 1127 #if NBPFILTER > 0 1128 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1129 #endif 1130 #ifdef MBUFTRACE 1131 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1132 sizeof(ec->ec_tx_mowner.mo_name)); 1133 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1134 sizeof(ec->ec_tx_mowner.mo_descr)); 1135 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1136 sizeof(ec->ec_rx_mowner.mo_name)); 1137 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1138 sizeof(ec->ec_rx_mowner.mo_descr)); 1139 MOWNER_ATTACH(&ec->ec_tx_mowner); 1140 MOWNER_ATTACH(&ec->ec_rx_mowner); 1141 ifp->if_mowner = &ec->ec_tx_mowner; 1142 #endif 1143 } 1144 1145 void 1146 ether_ifdetach(struct ifnet *ifp) 1147 { 1148 struct ethercom *ec = (void *) ifp; 1149 struct ether_multi *enm; 1150 int s; 1151 1152 #if NBRIDGE > 0 1153 if (ifp->if_bridge) 1154 bridge_ifdetach(ifp); 1155 #endif 1156 1157 #if NBPFILTER > 0 1158 bpfdetach(ifp); 1159 #endif 1160 1161 #if NVLAN > 0 1162 if (ec->ec_nvlans) 1163 vlan_ifdetach(ifp); 1164 #endif 1165 1166 s = splnet(); 1167 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1168 LIST_REMOVE(enm, enm_list); 1169 free(enm, M_IFMADDR); 1170 ec->ec_multicnt--; 1171 } 1172 splx(s); 1173 1174 #if 0 /* done in if_detach() */ 1175 if_free_sadl(ifp); 1176 #endif 1177 1178 MOWNER_DETACH(&ec->ec_rx_mowner); 1179 MOWNER_DETACH(&ec->ec_tx_mowner); 1180 } 1181 1182 #if 0 1183 /* 1184 * This is for reference. We have a table-driven version 1185 * of the little-endian crc32 generator, which is faster 1186 * than the double-loop. 1187 */ 1188 u_int32_t 1189 ether_crc32_le(const u_int8_t *buf, size_t len) 1190 { 1191 u_int32_t c, crc, carry; 1192 size_t i, j; 1193 1194 crc = 0xffffffffU; /* initial value */ 1195 1196 for (i = 0; i < len; i++) { 1197 c = buf[i]; 1198 for (j = 0; j < 8; j++) { 1199 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1200 crc >>= 1; 1201 c >>= 1; 1202 if (carry) 1203 crc = (crc ^ ETHER_CRC_POLY_LE); 1204 } 1205 } 1206 1207 return (crc); 1208 } 1209 #else 1210 u_int32_t 1211 ether_crc32_le(const u_int8_t *buf, size_t len) 1212 { 1213 static const u_int32_t crctab[] = { 1214 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1215 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1216 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1217 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1218 }; 1219 u_int32_t crc; 1220 size_t i; 1221 1222 crc = 0xffffffffU; /* initial value */ 1223 1224 for (i = 0; i < len; i++) { 1225 crc ^= buf[i]; 1226 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1227 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1228 } 1229 1230 return (crc); 1231 } 1232 #endif 1233 1234 u_int32_t 1235 ether_crc32_be(const u_int8_t *buf, size_t len) 1236 { 1237 u_int32_t c, crc, carry; 1238 size_t i, j; 1239 1240 crc = 0xffffffffU; /* initial value */ 1241 1242 for (i = 0; i < len; i++) { 1243 c = buf[i]; 1244 for (j = 0; j < 8; j++) { 1245 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1246 crc <<= 1; 1247 c >>= 1; 1248 if (carry) 1249 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1250 } 1251 } 1252 1253 return (crc); 1254 } 1255 1256 #ifdef INET 1257 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1258 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1259 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1260 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1261 #endif 1262 #ifdef INET6 1263 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1264 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1265 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1266 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1267 #endif 1268 1269 /* 1270 * Convert a sockaddr into an Ethernet address or range of Ethernet 1271 * addresses. 1272 */ 1273 int 1274 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1275 u_int8_t addrhi[ETHER_ADDR_LEN]) 1276 { 1277 #ifdef INET 1278 struct sockaddr_in *sin; 1279 #endif /* INET */ 1280 #ifdef INET6 1281 struct sockaddr_in6 *sin6; 1282 #endif /* INET6 */ 1283 1284 switch (sa->sa_family) { 1285 1286 case AF_UNSPEC: 1287 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1288 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1289 break; 1290 1291 #ifdef INET 1292 case AF_INET: 1293 sin = satosin(sa); 1294 if (sin->sin_addr.s_addr == INADDR_ANY) { 1295 /* 1296 * An IP address of INADDR_ANY means listen to 1297 * or stop listening to all of the Ethernet 1298 * multicast addresses used for IP. 1299 * (This is for the sake of IP multicast routers.) 1300 */ 1301 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1302 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1303 } 1304 else { 1305 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1306 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1307 } 1308 break; 1309 #endif 1310 #ifdef INET6 1311 case AF_INET6: 1312 sin6 = satosin6(sa); 1313 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1314 /* 1315 * An IP6 address of 0 means listen to or stop 1316 * listening to all of the Ethernet multicast 1317 * address used for IP6. 1318 * (This is used for multicast routers.) 1319 */ 1320 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1321 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1322 } else { 1323 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1324 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1325 } 1326 break; 1327 #endif 1328 1329 default: 1330 return (EAFNOSUPPORT); 1331 } 1332 return (0); 1333 } 1334 1335 /* 1336 * Add an Ethernet multicast address or range of addresses to the list for a 1337 * given interface. 1338 */ 1339 int 1340 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1341 { 1342 struct ether_multi *enm; 1343 u_char addrlo[ETHER_ADDR_LEN]; 1344 u_char addrhi[ETHER_ADDR_LEN]; 1345 int s = splnet(), error; 1346 1347 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1348 if (error != 0) { 1349 splx(s); 1350 return (error); 1351 } 1352 1353 /* 1354 * Verify that we have valid Ethernet multicast addresses. 1355 */ 1356 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1357 splx(s); 1358 return (EINVAL); 1359 } 1360 /* 1361 * See if the address range is already in the list. 1362 */ 1363 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1364 if (enm != NULL) { 1365 /* 1366 * Found it; just increment the reference count. 1367 */ 1368 ++enm->enm_refcount; 1369 splx(s); 1370 return (0); 1371 } 1372 /* 1373 * New address or range; malloc a new multicast record 1374 * and link it into the interface's multicast list. 1375 */ 1376 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1377 if (enm == NULL) { 1378 splx(s); 1379 return (ENOBUFS); 1380 } 1381 bcopy(addrlo, enm->enm_addrlo, 6); 1382 bcopy(addrhi, enm->enm_addrhi, 6); 1383 enm->enm_refcount = 1; 1384 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1385 ec->ec_multicnt++; 1386 splx(s); 1387 /* 1388 * Return ENETRESET to inform the driver that the list has changed 1389 * and its reception filter should be adjusted accordingly. 1390 */ 1391 return (ENETRESET); 1392 } 1393 1394 /* 1395 * Delete a multicast address record. 1396 */ 1397 int 1398 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1399 { 1400 struct ether_multi *enm; 1401 u_char addrlo[ETHER_ADDR_LEN]; 1402 u_char addrhi[ETHER_ADDR_LEN]; 1403 int s = splnet(), error; 1404 1405 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1406 if (error != 0) { 1407 splx(s); 1408 return (error); 1409 } 1410 1411 /* 1412 * Look ur the address in our list. 1413 */ 1414 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1415 if (enm == NULL) { 1416 splx(s); 1417 return (ENXIO); 1418 } 1419 if (--enm->enm_refcount != 0) { 1420 /* 1421 * Still some claims to this record. 1422 */ 1423 splx(s); 1424 return (0); 1425 } 1426 /* 1427 * No remaining claims to this record; unlink and free it. 1428 */ 1429 LIST_REMOVE(enm, enm_list); 1430 free(enm, M_IFMADDR); 1431 ec->ec_multicnt--; 1432 splx(s); 1433 /* 1434 * Return ENETRESET to inform the driver that the list has changed 1435 * and its reception filter should be adjusted accordingly. 1436 */ 1437 return (ENETRESET); 1438 } 1439 1440 /* 1441 * Common ioctls for Ethernet interfaces. Note, we must be 1442 * called at splnet(). 1443 */ 1444 int 1445 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1446 { 1447 struct ethercom *ec = (void *) ifp; 1448 struct ifreq *ifr = (struct ifreq *)data; 1449 struct ifaddr *ifa = (struct ifaddr *)data; 1450 int error = 0; 1451 1452 switch (cmd) { 1453 case SIOCSIFADDR: 1454 ifp->if_flags |= IFF_UP; 1455 switch (ifa->ifa_addr->sa_family) { 1456 case AF_LINK: 1457 { 1458 struct sockaddr_dl *sdl = 1459 (struct sockaddr_dl *) ifa->ifa_addr; 1460 1461 if (sdl->sdl_type != IFT_ETHER || 1462 sdl->sdl_alen != ifp->if_addrlen) { 1463 error = EINVAL; 1464 break; 1465 } 1466 1467 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1468 ifp->if_addrlen); 1469 1470 /* Set new address. */ 1471 error = (*ifp->if_init)(ifp); 1472 break; 1473 } 1474 #ifdef INET 1475 case AF_INET: 1476 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1477 (error = (*ifp->if_init)(ifp)) != 0) 1478 break; 1479 arp_ifinit(ifp, ifa); 1480 break; 1481 #endif /* INET */ 1482 #ifdef NS 1483 case AF_NS: 1484 { 1485 struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 1486 1487 if (ns_nullhost(*ina)) 1488 ina->x_host = *(union ns_host *) 1489 LLADDR(ifp->if_sadl); 1490 else 1491 memcpy(LLADDR(ifp->if_sadl), 1492 ina->x_host.c_host, ifp->if_addrlen); 1493 /* Set new address. */ 1494 error = (*ifp->if_init)(ifp); 1495 break; 1496 } 1497 #endif /* NS */ 1498 default: 1499 if ((ifp->if_flags & IFF_RUNNING) == 0) 1500 error = (*ifp->if_init)(ifp); 1501 break; 1502 } 1503 break; 1504 1505 case SIOCGIFADDR: 1506 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1507 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1508 break; 1509 1510 case SIOCSIFMTU: 1511 { 1512 int maxmtu; 1513 1514 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1515 maxmtu = ETHERMTU_JUMBO; 1516 else 1517 maxmtu = ETHERMTU; 1518 1519 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1520 error = EINVAL; 1521 else { 1522 ifp->if_mtu = ifr->ifr_mtu; 1523 1524 /* Make sure the device notices the MTU change. */ 1525 if (ifp->if_flags & IFF_UP) 1526 error = (*ifp->if_init)(ifp); 1527 } 1528 break; 1529 } 1530 1531 case SIOCSIFFLAGS: 1532 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1533 /* 1534 * If interface is marked down and it is running, 1535 * then stop and disable it. 1536 */ 1537 (*ifp->if_stop)(ifp, 1); 1538 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1539 /* 1540 * If interface is marked up and it is stopped, then 1541 * start it. 1542 */ 1543 error = (*ifp->if_init)(ifp); 1544 } else if ((ifp->if_flags & IFF_UP) != 0) { 1545 /* 1546 * Reset the interface to pick up changes in any other 1547 * flags that affect the hardware state. 1548 */ 1549 error = (*ifp->if_init)(ifp); 1550 } 1551 break; 1552 1553 case SIOCADDMULTI: 1554 error = ether_addmulti(ifr, ec); 1555 break; 1556 1557 case SIOCDELMULTI: 1558 error = ether_delmulti(ifr, ec); 1559 break; 1560 1561 default: 1562 error = ENOTTY; 1563 } 1564 1565 return (error); 1566 } 1567
Indexes created Tue Sep 23 22:09:46 GMT 2025