if_ethersubr.c revision 1.139.2.2
1 /* $NetBSD: if_ethersubr.c,v 1.139.2.2 2007/02/27 23:16:42 riz 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 1.139.2.2 2007/02/27 23:16:42 riz Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_atalk.h" 68 #include "opt_iso.h" 69 #include "opt_ipx.h" 70 #include "opt_mbuftrace.h" 71 #include "opt_gateway.h" 72 #include "opt_pfil_hooks.h" 73 #include "opt_pppoe.h" 74 #include "vlan.h" 75 #include "pppoe.h" 76 #include "bridge.h" 77 #include "bpfilter.h" 78 #include "arp.h" 79 #include "agr.h" 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/kernel.h> 84 #include <sys/callout.h> 85 #include <sys/malloc.h> 86 #include <sys/mbuf.h> 87 #include <sys/protosw.h> 88 #include <sys/socket.h> 89 #include <sys/ioctl.h> 90 #include <sys/errno.h> 91 #include <sys/syslog.h> 92 #include <sys/kauth.h> 93 94 #include <machine/cpu.h> 95 96 #include <net/if.h> 97 #include <net/netisr.h> 98 #include <net/route.h> 99 #include <net/if_llc.h> 100 #include <net/if_dl.h> 101 #include <net/if_types.h> 102 103 #if NARP == 0 104 /* 105 * XXX there should really be a way to issue this warning from within config(8) 106 */ 107 #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. 108 #endif 109 110 #if NBPFILTER > 0 111 #include <net/bpf.h> 112 #endif 113 114 #include <net/if_ether.h> 115 #if NVLAN > 0 116 #include <net/if_vlanvar.h> 117 #endif 118 119 #if NPPPOE > 0 120 #include <net/if_pppoe.h> 121 #endif 122 123 #if NAGR > 0 124 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 125 #include <net/agr/ieee8023ad.h> 126 #include <net/agr/if_agrvar.h> 127 #endif 128 129 #if NBRIDGE > 0 130 #include <net/if_bridgevar.h> 131 #endif 132 133 #include <netinet/in.h> 134 #ifdef INET 135 #include <netinet/in_var.h> 136 #endif 137 #include <netinet/if_inarp.h> 138 139 #ifdef INET6 140 #ifndef INET 141 #include <netinet/in.h> 142 #endif 143 #include <netinet6/in6_var.h> 144 #include <netinet6/nd6.h> 145 #endif 146 147 148 #include "carp.h" 149 #if NCARP > 0 150 #include <netinet/ip_carp.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 164 165 166 167 #ifdef NETATALK 168 #include <netatalk/at.h> 169 #include <netatalk/at_var.h> 170 #include <netatalk/at_extern.h> 171 172 #define llc_snap_org_code llc_un.type_snap.org_code 173 #define llc_snap_ether_type llc_un.type_snap.ether_type 174 175 extern u_char at_org_code[3]; 176 extern u_char aarp_org_code[3]; 177 #endif /* NETATALK */ 178 179 static struct timeval bigpktppslim_last; 180 static int bigpktppslim = 2; /* XXX */ 181 static int bigpktpps_count; 182 183 184 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 185 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 186 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 187 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 188 #define senderr(e) { error = (e); goto bad;} 189 190 #define SIN(x) ((struct sockaddr_in *)x) 191 192 static int ether_output(struct ifnet *, struct mbuf *, 193 struct sockaddr *, struct rtentry *); 194 195 /* 196 * Ethernet output routine. 197 * Encapsulate a packet of type family for the local net. 198 * Assumes that ifp is actually pointer to ethercom structure. 199 */ 200 static int 201 ether_output(struct ifnet *ifp0, struct mbuf *m0, struct sockaddr *dst, 202 struct rtentry *rt0) 203 { 204 u_int16_t etype = 0; 205 int error = 0, hdrcmplt = 0; 206 u_char esrc[6], edst[6]; 207 struct mbuf *m = m0; 208 struct rtentry *rt; 209 struct mbuf *mcopy = (struct mbuf *)0; 210 struct ether_header *eh; 211 struct ifnet *ifp = ifp0; 212 ALTQ_DECL(struct altq_pktattr pktattr;) 213 #ifdef INET 214 struct arphdr *ah; 215 #endif /* INET */ 216 #ifdef NETATALK 217 struct at_ifaddr *aa; 218 #endif /* NETATALK */ 219 220 #ifdef MBUFTRACE 221 m_claimm(m, ifp->if_mowner); 222 #endif 223 224 #if NCARP > 0 225 if (ifp->if_type == IFT_CARP) { 226 struct ifaddr *ifa; 227 228 /* loop back if this is going to the carp interface */ 229 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 230 (ifa = ifa_ifwithaddr(dst)) != NULL && 231 ifa->ifa_ifp == ifp0) 232 return (looutput(ifp0, m, dst, rt0)); 233 234 ifp = ifp->if_carpdev; 235 /* ac = (struct arpcom *)ifp; */ 236 237 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 238 (IFF_UP|IFF_RUNNING)) 239 senderr(ENETDOWN); 240 } 241 #endif /* NCARP > 0 */ 242 243 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 244 senderr(ENETDOWN); 245 if ((rt = rt0) != NULL) { 246 if ((rt->rt_flags & RTF_UP) == 0) { 247 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 248 rt->rt_refcnt--; 249 if (rt->rt_ifp != ifp) 250 return (*rt->rt_ifp->if_output) 251 (ifp, m0, dst, rt); 252 } else 253 senderr(EHOSTUNREACH); 254 } 255 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 256 if (rt->rt_gwroute == 0) 257 goto lookup; 258 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 259 rtfree(rt); rt = rt0; 260 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 261 if ((rt = rt->rt_gwroute) == 0) 262 senderr(EHOSTUNREACH); 263 /* the "G" test below also prevents rt == rt0 */ 264 if ((rt->rt_flags & RTF_GATEWAY) || 265 (rt->rt_ifp != ifp)) { 266 rt->rt_refcnt--; 267 rt0->rt_gwroute = 0; 268 senderr(EHOSTUNREACH); 269 } 270 } 271 } 272 if (rt->rt_flags & RTF_REJECT) 273 if (rt->rt_rmx.rmx_expire == 0 || 274 (u_long) time_second < rt->rt_rmx.rmx_expire) 275 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 276 } 277 278 switch (dst->sa_family) { 279 280 #ifdef INET 281 case AF_INET: 282 if (m->m_flags & M_BCAST) 283 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 284 285 else if (m->m_flags & M_MCAST) { 286 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, 287 (caddr_t)edst) 288 289 } else if (!arpresolve(ifp, rt, m, dst, edst)) 290 return (0); /* if not yet resolved */ 291 /* If broadcasting on a simplex interface, loopback a copy */ 292 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 293 mcopy = m_copy(m, 0, (int)M_COPYALL); 294 etype = htons(ETHERTYPE_IP); 295 break; 296 297 case AF_ARP: 298 ah = mtod(m, struct arphdr *); 299 if (m->m_flags & M_BCAST) 300 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 301 else { 302 caddr_t tha = ar_tha(ah); 303 304 KASSERT(tha); 305 bcopy(tha, (caddr_t)edst, sizeof(edst)); 306 } 307 308 ah->ar_hrd = htons(ARPHRD_ETHER); 309 310 switch (ntohs(ah->ar_op)) { 311 case ARPOP_REVREQUEST: 312 case ARPOP_REVREPLY: 313 etype = htons(ETHERTYPE_REVARP); 314 break; 315 316 case ARPOP_REQUEST: 317 case ARPOP_REPLY: 318 default: 319 etype = htons(ETHERTYPE_ARP); 320 } 321 322 break; 323 #endif 324 #ifdef INET6 325 case AF_INET6: 326 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst)){ 327 /* something bad happened */ 328 return (0); 329 } 330 etype = htons(ETHERTYPE_IPV6); 331 break; 332 #endif 333 #ifdef NETATALK 334 case AF_APPLETALK: 335 if (!aarpresolve(ifp, m, (struct sockaddr_at *)dst, edst)) { 336 #ifdef NETATALKDEBUG 337 printf("aarpresolv failed\n"); 338 #endif /* NETATALKDEBUG */ 339 return (0); 340 } 341 /* 342 * ifaddr is the first thing in at_ifaddr 343 */ 344 aa = (struct at_ifaddr *) at_ifawithnet( 345 (struct sockaddr_at *)dst, ifp); 346 if (aa == NULL) 347 goto bad; 348 349 /* 350 * In the phase 2 case, we need to prepend an mbuf for the 351 * llc header. Since we must preserve the value of m, 352 * which is passed to us by value, we m_copy() the first 353 * mbuf, and use it for our llc header. 354 */ 355 if (aa->aa_flags & AFA_PHASE2) { 356 struct llc llc; 357 358 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 359 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 360 llc.llc_control = LLC_UI; 361 bcopy(at_org_code, llc.llc_snap_org_code, 362 sizeof(llc.llc_snap_org_code)); 363 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 364 bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); 365 } else { 366 etype = htons(ETHERTYPE_ATALK); 367 } 368 break; 369 #endif /* NETATALK */ 370 #ifdef IPX 371 case AF_IPX: 372 etype = htons(ETHERTYPE_IPX); 373 bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 374 (caddr_t)edst, sizeof (edst)); 375 /* If broadcasting on a simplex interface, loopback a copy */ 376 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 377 mcopy = m_copy(m, 0, (int)M_COPYALL); 378 break; 379 #endif 380 #ifdef ISO 381 case AF_ISO: { 382 int snpalen; 383 struct llc *l; 384 struct sockaddr_dl *sdl; 385 386 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 387 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 388 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 389 } else { 390 error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst, 391 (char *)edst, &snpalen); 392 if (error) 393 goto bad; /* Not Resolved */ 394 } 395 /* If broadcasting on a simplex interface, loopback a copy */ 396 if (*edst & 1) 397 m->m_flags |= (M_BCAST|M_MCAST); 398 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 399 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 400 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 401 if (mcopy) { 402 eh = mtod(mcopy, struct ether_header *); 403 bcopy((caddr_t)edst, 404 (caddr_t)eh->ether_dhost, sizeof (edst)); 405 bcopy(LLADDR(ifp->if_sadl), 406 (caddr_t)eh->ether_shost, sizeof (edst)); 407 } 408 } 409 M_PREPEND(m, 3, M_DONTWAIT); 410 if (m == NULL) 411 return (0); 412 l = mtod(m, struct llc *); 413 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 414 l->llc_control = LLC_UI; 415 #ifdef ARGO_DEBUG 416 if (argo_debug[D_ETHER]) { 417 int i; 418 printf("unoutput: sending pkt to: "); 419 for (i=0; i<6; i++) 420 printf("%x ", edst[i] & 0xff); 421 printf("\n"); 422 } 423 #endif 424 } break; 425 #endif /* ISO */ 426 427 case pseudo_AF_HDRCMPLT: 428 hdrcmplt = 1; 429 eh = (struct ether_header *)dst->sa_data; 430 bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (esrc)); 431 /* FALLTHROUGH */ 432 433 case AF_UNSPEC: 434 eh = (struct ether_header *)dst->sa_data; 435 bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); 436 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 437 etype = eh->ether_type; 438 break; 439 440 default: 441 printf("%s: can't handle af%d\n", ifp->if_xname, 442 dst->sa_family); 443 senderr(EAFNOSUPPORT); 444 } 445 446 if (mcopy) 447 (void) looutput(ifp, mcopy, dst, rt); 448 449 /* If no ether type is set, this must be a 802.2 formatted packet. 450 */ 451 if (etype == 0) 452 etype = htons(m->m_pkthdr.len); 453 /* 454 * Add local net header. If no space in first mbuf, 455 * allocate another. 456 */ 457 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 458 if (m == 0) 459 senderr(ENOBUFS); 460 eh = mtod(m, struct ether_header *); 461 /* Note: etype is already in network byte order. */ 462 #ifdef __NO_STRICT_ALIGNMENT 463 eh->ether_type = etype; 464 #else 465 { 466 uint8_t *dstp = (uint8_t *) &eh->ether_type; 467 #if BYTE_ORDER == BIG_ENDIAN 468 dstp[0] = etype >> 8; 469 dstp[1] = etype; 470 #else 471 dstp[0] = etype; 472 dstp[1] = etype >> 8; 473 #endif /* BYTE_ORDER == BIG_ENDIAN */ 474 } 475 #endif /* __NO_STRICT_ALIGNMENT */ 476 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 477 if (hdrcmplt) 478 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 479 sizeof(eh->ether_shost)); 480 else 481 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 482 sizeof(eh->ether_shost)); 483 484 #if NCARP > 0 485 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 486 bcopy(LLADDR(ifp0->if_sadl), (caddr_t)eh->ether_shost, 487 sizeof(eh->ether_shost)); 488 } 489 #endif /* NCARP > 0 */ 490 491 #ifdef PFIL_HOOKS 492 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 493 return (error); 494 if (m == NULL) 495 return (0); 496 #endif 497 498 #if NBRIDGE > 0 499 /* 500 * Bridges require special output handling. 501 */ 502 if (ifp->if_bridge) 503 return (bridge_output(ifp, m, NULL, NULL)); 504 #endif 505 506 #if NCARP > 0 507 if (ifp != ifp0) 508 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 509 #endif /* NCARP > 0 */ 510 511 #ifdef ALTQ 512 /* 513 * If ALTQ is enabled on the parent interface, do 514 * classification; the queueing discipline might not 515 * require classification, but might require the 516 * address family/header pointer in the pktattr. 517 */ 518 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 519 altq_etherclassify(&ifp->if_snd, m, &pktattr); 520 #endif 521 522 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 523 524 bad: 525 if (m) 526 m_freem(m); 527 return (error); 528 } 529 530 #ifdef ALTQ 531 /* 532 * This routine is a slight hack to allow a packet to be classified 533 * if the Ethernet headers are present. It will go away when ALTQ's 534 * classification engine understands link headers. 535 */ 536 void 537 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 538 struct altq_pktattr *pktattr) 539 { 540 struct ether_header *eh; 541 u_int16_t ether_type; 542 int hlen, af, hdrsize; 543 caddr_t hdr; 544 545 hlen = ETHER_HDR_LEN; 546 eh = mtod(m, struct ether_header *); 547 548 ether_type = htons(eh->ether_type); 549 550 if (ether_type < ETHERMTU) { 551 /* LLC/SNAP */ 552 struct llc *llc = (struct llc *)(eh + 1); 553 hlen += 8; 554 555 if (m->m_len < hlen || 556 llc->llc_dsap != LLC_SNAP_LSAP || 557 llc->llc_ssap != LLC_SNAP_LSAP || 558 llc->llc_control != LLC_UI) { 559 /* Not SNAP. */ 560 goto bad; 561 } 562 563 ether_type = htons(llc->llc_un.type_snap.ether_type); 564 } 565 566 switch (ether_type) { 567 case ETHERTYPE_IP: 568 af = AF_INET; 569 hdrsize = 20; /* sizeof(struct ip) */ 570 break; 571 572 case ETHERTYPE_IPV6: 573 af = AF_INET6; 574 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 575 break; 576 577 default: 578 af = AF_UNSPEC; 579 hdrsize = 0; 580 break; 581 } 582 583 while (m->m_len <= hlen) { 584 hlen -= m->m_len; 585 m = m->m_next; 586 } 587 if (m->m_len < (hlen + hdrsize)) { 588 /* 589 * protocol header not in a single mbuf. 590 * We can't cope with this situation right 591 * now (but it shouldn't ever happen, really, anyhow). 592 */ 593 #ifdef DEBUG 594 printf("altq_etherclassify: headers span multiple mbufs: " 595 "%d < %d\n", m->m_len, (hlen + hdrsize)); 596 #endif 597 goto bad; 598 } 599 600 m->m_data += hlen; 601 m->m_len -= hlen; 602 603 hdr = mtod(m, caddr_t); 604 605 if (ALTQ_NEEDS_CLASSIFY(ifq)) 606 pktattr->pattr_class = 607 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 608 pktattr->pattr_af = af; 609 pktattr->pattr_hdr = hdr; 610 611 m->m_data -= hlen; 612 m->m_len += hlen; 613 614 return; 615 616 bad: 617 pktattr->pattr_class = NULL; 618 pktattr->pattr_hdr = NULL; 619 pktattr->pattr_af = AF_UNSPEC; 620 } 621 #endif /* ALTQ */ 622 623 /* 624 * Process a received Ethernet packet; 625 * the packet is in the mbuf chain m with 626 * the ether header. 627 */ 628 void 629 ether_input(struct ifnet *ifp, struct mbuf *m) 630 { 631 struct ethercom *ec = (struct ethercom *) ifp; 632 struct ifqueue *inq; 633 u_int16_t etype; 634 struct ether_header *eh; 635 #if defined (ISO) || defined (LLC) || defined(NETATALK) 636 struct llc *l; 637 #endif 638 639 if ((ifp->if_flags & IFF_UP) == 0) { 640 m_freem(m); 641 return; 642 } 643 644 #ifdef MBUFTRACE 645 m_claimm(m, &ec->ec_rx_mowner); 646 #endif 647 eh = mtod(m, struct ether_header *); 648 etype = ntohs(eh->ether_type); 649 650 /* 651 * Determine if the packet is within its size limits. 652 */ 653 if (m->m_pkthdr.len > 654 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 655 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 656 bigpktppslim)) { 657 printf("%s: discarding oversize frame (len=%d)\n", 658 ifp->if_xname, m->m_pkthdr.len); 659 } 660 m_freem(m); 661 return; 662 } 663 664 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 665 /* 666 * If this is not a simplex interface, drop the packet 667 * if it came from us. 668 */ 669 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 670 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 671 ETHER_ADDR_LEN) == 0) { 672 m_freem(m); 673 return; 674 } 675 676 if (memcmp(etherbroadcastaddr, 677 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 678 m->m_flags |= M_BCAST; 679 else 680 m->m_flags |= M_MCAST; 681 ifp->if_imcasts++; 682 } 683 684 /* If the CRC is still on the packet, trim it off. */ 685 if (m->m_flags & M_HASFCS) { 686 m_adj(m, -ETHER_CRC_LEN); 687 m->m_flags &= ~M_HASFCS; 688 } 689 690 ifp->if_ibytes += m->m_pkthdr.len; 691 692 #if NBRIDGE > 0 693 /* 694 * Tap the packet off here for a bridge. bridge_input() 695 * will return NULL if it has consumed the packet, otherwise 696 * it gets processed as normal. Note that bridge_input() 697 * will always return the original packet if we need to 698 * process it locally. 699 */ 700 if (ifp->if_bridge) { 701 /* clear M_PROMISC, in case the packets comes from a vlan */ 702 m->m_flags &= ~M_PROMISC; 703 m = bridge_input(ifp, m); 704 if (m == NULL) 705 return; 706 707 /* 708 * Bridge has determined that the packet is for us. 709 * Update our interface pointer -- we may have had 710 * to "bridge" the packet locally. 711 */ 712 ifp = m->m_pkthdr.rcvif; 713 } else 714 #endif /* NBRIDGE > 0 */ 715 { 716 717 #if NCARP > 0 718 if (ifp->if_carp && ifp->if_type != IFT_CARP) { 719 /* 720 * clear M_PROMISC, in case the packets comes from a 721 * vlan 722 */ 723 m->m_flags &= ~M_PROMISC; 724 if (carp_input(m, (u_int8_t *)&eh->ether_shost, 725 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0) 726 return; 727 } 728 #endif /* NCARP > 0 */ 729 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 730 (ifp->if_flags & IFF_PROMISC) != 0 && 731 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 732 ETHER_ADDR_LEN) != 0) { 733 m->m_flags |= M_PROMISC; 734 } 735 } 736 737 #ifdef PFIL_HOOKS 738 if ((m->m_flags & M_PROMISC) == 0) { 739 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 740 return; 741 if (m == NULL) 742 return; 743 744 eh = mtod(m, struct ether_header *); 745 etype = ntohs(eh->ether_type); 746 } 747 #endif 748 749 /* 750 * If VLANs are configured on the interface, check to 751 * see if the device performed the decapsulation and 752 * provided us with the tag. 753 */ 754 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 755 #if NVLAN > 0 756 /* 757 * vlan_input() will either recursively call ether_input() 758 * or drop the packet. 759 */ 760 vlan_input(ifp, m); 761 #else 762 m_freem(m); 763 #endif 764 return; 765 } 766 767 #if NAGR > 0 768 if (ifp->if_agrprivate && 769 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 770 m->m_flags &= ~M_PROMISC; 771 agr_input(ifp, m); 772 return; 773 } 774 #endif /* NAGR > 0 */ 775 776 /* 777 * Handle protocols that expect to have the Ethernet header 778 * (and possibly FCS) intact. 779 */ 780 switch (etype) { 781 #if NVLAN > 0 782 case ETHERTYPE_VLAN: 783 /* 784 * vlan_input() will either recursively call ether_input() 785 * or drop the packet. 786 */ 787 if (((struct ethercom *)ifp)->ec_nvlans != 0) 788 vlan_input(ifp, m); 789 else 790 m_freem(m); 791 return; 792 #endif /* NVLAN > 0 */ 793 #if NPPPOE > 0 794 case ETHERTYPE_PPPOEDISC: 795 case ETHERTYPE_PPPOE: 796 if (m->m_flags & M_PROMISC) { 797 m_freem(m); 798 return; 799 } 800 #ifndef PPPOE_SERVER 801 if (m->m_flags & (M_MCAST | M_BCAST)) { 802 m_freem(m); 803 return; 804 } 805 #endif 806 807 if (etype == ETHERTYPE_PPPOEDISC) 808 inq = &ppoediscinq; 809 else 810 inq = &ppoeinq; 811 if (IF_QFULL(inq)) { 812 IF_DROP(inq); 813 m_freem(m); 814 } else 815 IF_ENQUEUE(inq, m); 816 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 817 if (!callout_pending(&pppoe_softintr)) 818 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 819 #else 820 softintr_schedule(pppoe_softintr); 821 #endif 822 return; 823 #endif /* NPPPOE > 0 */ 824 case ETHERTYPE_SLOWPROTOCOLS: { 825 uint8_t subtype; 826 827 #if defined(DIAGNOSTIC) 828 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 829 panic("ether_input: too short slow protocol packet"); 830 } 831 #endif 832 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 833 switch (subtype) { 834 #if NAGR > 0 835 case SLOWPROTOCOLS_SUBTYPE_LACP: 836 if (ifp->if_agrprivate) { 837 ieee8023ad_lacp_input(ifp, m); 838 return; 839 } 840 break; 841 842 case SLOWPROTOCOLS_SUBTYPE_MARKER: 843 if (ifp->if_agrprivate) { 844 ieee8023ad_marker_input(ifp, m); 845 return; 846 } 847 break; 848 #endif /* NAGR > 0 */ 849 default: 850 if (subtype == 0 || subtype > 10) { 851 /* illegal value */ 852 m_freem(m); 853 return; 854 } 855 /* unknown subtype */ 856 break; 857 } 858 /* FALLTHROUGH */ 859 } 860 default: 861 if (m->m_flags & M_PROMISC) { 862 m_freem(m); 863 return; 864 } 865 } 866 867 /* If the CRC is still on the packet, trim it off. */ 868 if (m->m_flags & M_HASFCS) { 869 m_adj(m, -ETHER_CRC_LEN); 870 m->m_flags &= ~M_HASFCS; 871 } 872 873 if (etype > ETHERMTU + sizeof (struct ether_header)) { 874 /* Strip off the Ethernet header. */ 875 m_adj(m, sizeof(struct ether_header)); 876 877 switch (etype) { 878 #ifdef INET 879 case ETHERTYPE_IP: 880 #ifdef GATEWAY 881 if (ipflow_fastforward(m)) 882 return; 883 #endif 884 schednetisr(NETISR_IP); 885 inq = &ipintrq; 886 break; 887 888 case ETHERTYPE_ARP: 889 schednetisr(NETISR_ARP); 890 inq = &arpintrq; 891 break; 892 893 case ETHERTYPE_REVARP: 894 revarpinput(m); /* XXX queue? */ 895 return; 896 #endif 897 #ifdef INET6 898 case ETHERTYPE_IPV6: 899 schednetisr(NETISR_IPV6); 900 inq = &ip6intrq; 901 break; 902 #endif 903 #ifdef IPX 904 case ETHERTYPE_IPX: 905 schednetisr(NETISR_IPX); 906 inq = &ipxintrq; 907 break; 908 #endif 909 #ifdef NETATALK 910 case ETHERTYPE_ATALK: 911 schednetisr(NETISR_ATALK); 912 inq = &atintrq1; 913 break; 914 case ETHERTYPE_AARP: 915 /* probably this should be done with a NETISR as well */ 916 aarpinput(ifp, m); /* XXX */ 917 return; 918 #endif /* NETATALK */ 919 default: 920 m_freem(m); 921 return; 922 } 923 } else { 924 #if defined (ISO) || defined (LLC) || defined (NETATALK) 925 l = (struct llc *)(eh+1); 926 switch (l->llc_dsap) { 927 #ifdef NETATALK 928 case LLC_SNAP_LSAP: 929 switch (l->llc_control) { 930 case LLC_UI: 931 if (l->llc_ssap != LLC_SNAP_LSAP) { 932 goto dropanyway; 933 } 934 935 if (Bcmp(&(l->llc_snap_org_code)[0], 936 at_org_code, sizeof(at_org_code)) == 0 && 937 ntohs(l->llc_snap_ether_type) == 938 ETHERTYPE_ATALK) { 939 inq = &atintrq2; 940 m_adj(m, sizeof(struct ether_header) 941 + sizeof(struct llc)); 942 schednetisr(NETISR_ATALK); 943 break; 944 } 945 946 if (Bcmp(&(l->llc_snap_org_code)[0], 947 aarp_org_code, 948 sizeof(aarp_org_code)) == 0 && 949 ntohs(l->llc_snap_ether_type) == 950 ETHERTYPE_AARP) { 951 m_adj( m, sizeof(struct ether_header) 952 + sizeof(struct llc)); 953 aarpinput(ifp, m); /* XXX */ 954 return; 955 } 956 957 default: 958 goto dropanyway; 959 } 960 break; 961 #endif /* NETATALK */ 962 #ifdef ISO 963 case LLC_ISO_LSAP: 964 switch (l->llc_control) { 965 case LLC_UI: 966 /* LLC_UI_P forbidden in class 1 service */ 967 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 968 (l->llc_ssap == LLC_ISO_LSAP)) { 969 /* LSAP for ISO */ 970 /* XXX length computation?? */ 971 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 972 m_adj(m, etype - m->m_pkthdr.len); 973 974 #ifdef ARGO_DEBUG 975 if (argo_debug[D_ETHER]) 976 printf("clnp packet"); 977 #endif 978 schednetisr(NETISR_ISO); 979 inq = &clnlintrq; 980 break; 981 } 982 goto dropanyway; 983 984 case LLC_XID: 985 case LLC_XID_P: 986 if(m->m_len < 6 + sizeof(struct ether_header)) 987 /* XXX m_pullup? */ 988 goto dropanyway; 989 l->llc_window = 0; 990 l->llc_fid = 9; 991 l->llc_class = 1; 992 l->llc_dsap = l->llc_ssap = 0; 993 /* Fall through to */ 994 case LLC_TEST: 995 case LLC_TEST_P: 996 { 997 struct sockaddr sa; 998 struct ether_header *eh2; 999 int i; 1000 u_char c = l->llc_dsap; 1001 1002 l->llc_dsap = l->llc_ssap; 1003 l->llc_ssap = c; 1004 m_adj(m, sizeof(struct ether_header)); 1005 /* XXX we can optimize here? */ 1006 if (m->m_flags & (M_BCAST | M_MCAST)) 1007 bcopy(LLADDR(ifp->if_sadl), 1008 (caddr_t)eh->ether_dhost, 6); 1009 sa.sa_family = AF_UNSPEC; 1010 sa.sa_len = sizeof(sa); 1011 eh2 = (struct ether_header *)sa.sa_data; 1012 for (i = 0; i < 6; i++) { 1013 eh2->ether_shost[i] = c = 1014 eh->ether_dhost[i]; 1015 eh2->ether_dhost[i] = 1016 eh->ether_dhost[i] = 1017 eh->ether_shost[i]; 1018 eh->ether_shost[i] = c; 1019 } 1020 ifp->if_output(ifp, m, &sa, NULL); 1021 return; 1022 } 1023 default: 1024 m_freem(m); 1025 return; 1026 } 1027 break; 1028 #endif /* ISO */ 1029 #if defined (ISO) || defined (NETATALK) 1030 dropanyway: 1031 #endif 1032 default: 1033 m_freem(m); 1034 return; 1035 } 1036 #else /* ISO || LLC || NETATALK*/ 1037 m_freem(m); 1038 return; 1039 #endif /* ISO || LLC || NETATALK*/ 1040 } 1041 1042 if (IF_QFULL(inq)) { 1043 IF_DROP(inq); 1044 m_freem(m); 1045 } else 1046 IF_ENQUEUE(inq, m); 1047 } 1048 1049 /* 1050 * Convert Ethernet address to printable (loggable) representation. 1051 */ 1052 char * 1053 ether_sprintf(const u_char *ap) 1054 { 1055 static char etherbuf[3 * ETHER_ADDR_LEN]; 1056 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1057 return etherbuf; 1058 } 1059 1060 char * 1061 ether_snprintf(char *buf, size_t len, const u_char *ap) 1062 { 1063 char *cp = buf; 1064 size_t i; 1065 1066 for (i = 0; i < len / 3; i++) { 1067 *cp++ = hexdigits[*ap >> 4]; 1068 *cp++ = hexdigits[*ap++ & 0xf]; 1069 *cp++ = ':'; 1070 } 1071 *--cp = '\0'; 1072 return buf; 1073 } 1074 1075 /* 1076 * Perform common duties while attaching to interface list 1077 */ 1078 void 1079 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1080 { 1081 struct ethercom *ec = (struct ethercom *)ifp; 1082 1083 ifp->if_type = IFT_ETHER; 1084 ifp->if_addrlen = ETHER_ADDR_LEN; 1085 ifp->if_hdrlen = ETHER_HDR_LEN; 1086 ifp->if_dlt = DLT_EN10MB; 1087 ifp->if_mtu = ETHERMTU; 1088 ifp->if_output = ether_output; 1089 ifp->if_input = ether_input; 1090 if (ifp->if_baudrate == 0) 1091 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1092 1093 if_alloc_sadl(ifp); 1094 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1095 1096 LIST_INIT(&ec->ec_multiaddrs); 1097 ifp->if_broadcastaddr = etherbroadcastaddr; 1098 #if NBPFILTER > 0 1099 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1100 #endif 1101 #ifdef MBUFTRACE 1102 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1103 sizeof(ec->ec_tx_mowner.mo_name)); 1104 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1105 sizeof(ec->ec_tx_mowner.mo_descr)); 1106 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1107 sizeof(ec->ec_rx_mowner.mo_name)); 1108 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1109 sizeof(ec->ec_rx_mowner.mo_descr)); 1110 MOWNER_ATTACH(&ec->ec_tx_mowner); 1111 MOWNER_ATTACH(&ec->ec_rx_mowner); 1112 ifp->if_mowner = &ec->ec_tx_mowner; 1113 #endif 1114 } 1115 1116 void 1117 ether_ifdetach(struct ifnet *ifp) 1118 { 1119 struct ethercom *ec = (void *) ifp; 1120 struct ether_multi *enm; 1121 int s; 1122 1123 #if NBRIDGE > 0 1124 if (ifp->if_bridge) 1125 bridge_ifdetach(ifp); 1126 #endif 1127 1128 #if NBPFILTER > 0 1129 bpfdetach(ifp); 1130 #endif 1131 1132 #if NVLAN > 0 1133 if (ec->ec_nvlans) 1134 vlan_ifdetach(ifp); 1135 #endif 1136 1137 s = splnet(); 1138 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1139 LIST_REMOVE(enm, enm_list); 1140 free(enm, M_IFMADDR); 1141 ec->ec_multicnt--; 1142 } 1143 splx(s); 1144 1145 #if 0 /* done in if_detach() */ 1146 if_free_sadl(ifp); 1147 #endif 1148 1149 MOWNER_DETACH(&ec->ec_rx_mowner); 1150 MOWNER_DETACH(&ec->ec_tx_mowner); 1151 } 1152 1153 #if 0 1154 /* 1155 * This is for reference. We have a table-driven version 1156 * of the little-endian crc32 generator, which is faster 1157 * than the double-loop. 1158 */ 1159 u_int32_t 1160 ether_crc32_le(const u_int8_t *buf, size_t len) 1161 { 1162 u_int32_t c, crc, carry; 1163 size_t i, j; 1164 1165 crc = 0xffffffffU; /* initial value */ 1166 1167 for (i = 0; i < len; i++) { 1168 c = buf[i]; 1169 for (j = 0; j < 8; j++) { 1170 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1171 crc >>= 1; 1172 c >>= 1; 1173 if (carry) 1174 crc = (crc ^ ETHER_CRC_POLY_LE); 1175 } 1176 } 1177 1178 return (crc); 1179 } 1180 #else 1181 u_int32_t 1182 ether_crc32_le(const u_int8_t *buf, size_t len) 1183 { 1184 static const u_int32_t crctab[] = { 1185 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1186 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1187 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1188 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1189 }; 1190 u_int32_t crc; 1191 size_t i; 1192 1193 crc = 0xffffffffU; /* initial value */ 1194 1195 for (i = 0; i < len; i++) { 1196 crc ^= buf[i]; 1197 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1198 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1199 } 1200 1201 return (crc); 1202 } 1203 #endif 1204 1205 u_int32_t 1206 ether_crc32_be(const u_int8_t *buf, size_t len) 1207 { 1208 u_int32_t c, crc, carry; 1209 size_t i, j; 1210 1211 crc = 0xffffffffU; /* initial value */ 1212 1213 for (i = 0; i < len; i++) { 1214 c = buf[i]; 1215 for (j = 0; j < 8; j++) { 1216 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1217 crc <<= 1; 1218 c >>= 1; 1219 if (carry) 1220 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1221 } 1222 } 1223 1224 return (crc); 1225 } 1226 1227 #ifdef INET 1228 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1229 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1230 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1231 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1232 #endif 1233 #ifdef INET6 1234 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1235 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1236 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1237 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1238 #endif 1239 1240 /* 1241 * ether_aton implementation, not using a static buffer. 1242 */ 1243 int 1244 ether_nonstatic_aton(u_char *dest, char *str) 1245 { 1246 int i; 1247 char *cp = str; 1248 u_char val[6]; 1249 1250 #define set_value \ 1251 if (*cp > '9' && *cp < 'a') \ 1252 *cp -= 'A' - 10; \ 1253 else if (*cp > '9') \ 1254 *cp -= 'a' - 10; \ 1255 else \ 1256 *cp -= '0' 1257 1258 for (i = 0; i < 6; i++, cp++) { 1259 if (!isxdigit(*cp)) 1260 return (1); 1261 set_value; 1262 val[i] = *cp++; 1263 if (isxdigit(*cp)) { 1264 set_value; 1265 val[i] *= 16; 1266 val[i] += *cp++; 1267 } 1268 if (*cp == ':' || i == 5) 1269 continue; 1270 else 1271 return 1; 1272 } 1273 memcpy(dest, val, 6); 1274 1275 return 0; 1276 } 1277 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 default: 1493 if ((ifp->if_flags & IFF_RUNNING) == 0) 1494 error = (*ifp->if_init)(ifp); 1495 break; 1496 } 1497 break; 1498 1499 case SIOCGIFADDR: 1500 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1501 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1502 break; 1503 1504 case SIOCSIFMTU: 1505 { 1506 int maxmtu; 1507 1508 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1509 maxmtu = ETHERMTU_JUMBO; 1510 else 1511 maxmtu = ETHERMTU; 1512 1513 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1514 error = EINVAL; 1515 else { 1516 ifp->if_mtu = ifr->ifr_mtu; 1517 1518 /* Make sure the device notices the MTU change. */ 1519 if (ifp->if_flags & IFF_UP) 1520 error = (*ifp->if_init)(ifp); 1521 } 1522 break; 1523 } 1524 1525 case SIOCSIFFLAGS: 1526 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1527 /* 1528 * If interface is marked down and it is running, 1529 * then stop and disable it. 1530 */ 1531 (*ifp->if_stop)(ifp, 1); 1532 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1533 /* 1534 * If interface is marked up and it is stopped, then 1535 * start it. 1536 */ 1537 error = (*ifp->if_init)(ifp); 1538 } else if ((ifp->if_flags & IFF_UP) != 0) { 1539 /* 1540 * Reset the interface to pick up changes in any other 1541 * flags that affect the hardware state. 1542 */ 1543 error = (*ifp->if_init)(ifp); 1544 } 1545 break; 1546 1547 case SIOCADDMULTI: 1548 error = ether_addmulti(ifr, ec); 1549 break; 1550 1551 case SIOCDELMULTI: 1552 error = ether_delmulti(ifr, ec); 1553 break; 1554 1555 default: 1556 error = ENOTTY; 1557 } 1558 1559 return (error); 1560 } 1561
Indexes created Tue Sep 30 10:09:55 GMT 2025