if_ethersubr.c revision 1.139
1 /* $NetBSD: if_ethersubr.c,v 1.139 2006/12/01 18:43:40 is 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 2006/12/01 18:43:40 is 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 (carp_input(m, (u_int8_t *)&eh->ether_shost, 720 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0)) { 721 return; 722 } 723 #endif /* NCARP > 0 */ 724 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 725 (ifp->if_flags & IFF_PROMISC) != 0 && 726 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 727 ETHER_ADDR_LEN) != 0) { 728 m->m_flags |= M_PROMISC; 729 } 730 } 731 732 #ifdef PFIL_HOOKS 733 if ((m->m_flags & M_PROMISC) == 0) { 734 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 735 return; 736 if (m == NULL) 737 return; 738 739 eh = mtod(m, struct ether_header *); 740 etype = ntohs(eh->ether_type); 741 } 742 #endif 743 744 /* 745 * If VLANs are configured on the interface, check to 746 * see if the device performed the decapsulation and 747 * provided us with the tag. 748 */ 749 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 750 #if NVLAN > 0 751 /* 752 * vlan_input() will either recursively call ether_input() 753 * or drop the packet. 754 */ 755 vlan_input(ifp, m); 756 #else 757 m_freem(m); 758 #endif 759 return; 760 } 761 762 #if NAGR > 0 763 if (ifp->if_agrprivate && 764 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 765 m->m_flags &= ~M_PROMISC; 766 agr_input(ifp, m); 767 return; 768 } 769 #endif /* NAGR > 0 */ 770 771 /* 772 * Handle protocols that expect to have the Ethernet header 773 * (and possibly FCS) intact. 774 */ 775 switch (etype) { 776 #if NVLAN > 0 777 case ETHERTYPE_VLAN: 778 /* 779 * vlan_input() will either recursively call ether_input() 780 * or drop the packet. 781 */ 782 if (((struct ethercom *)ifp)->ec_nvlans != 0) 783 vlan_input(ifp, m); 784 else 785 m_freem(m); 786 return; 787 #endif /* NVLAN > 0 */ 788 #if NPPPOE > 0 789 case ETHERTYPE_PPPOEDISC: 790 case ETHERTYPE_PPPOE: 791 if (m->m_flags & M_PROMISC) { 792 m_freem(m); 793 return; 794 } 795 #ifndef PPPOE_SERVER 796 if (m->m_flags & (M_MCAST | M_BCAST)) { 797 m_freem(m); 798 return; 799 } 800 #endif 801 802 if (etype == ETHERTYPE_PPPOEDISC) 803 inq = &ppoediscinq; 804 else 805 inq = &ppoeinq; 806 if (IF_QFULL(inq)) { 807 IF_DROP(inq); 808 m_freem(m); 809 } else 810 IF_ENQUEUE(inq, m); 811 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 812 if (!callout_pending(&pppoe_softintr)) 813 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 814 #else 815 softintr_schedule(pppoe_softintr); 816 #endif 817 return; 818 #endif /* NPPPOE > 0 */ 819 case ETHERTYPE_SLOWPROTOCOLS: { 820 uint8_t subtype; 821 822 #if defined(DIAGNOSTIC) 823 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 824 panic("ether_input: too short slow protocol packet"); 825 } 826 #endif 827 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 828 switch (subtype) { 829 #if NAGR > 0 830 case SLOWPROTOCOLS_SUBTYPE_LACP: 831 if (ifp->if_agrprivate) { 832 ieee8023ad_lacp_input(ifp, m); 833 return; 834 } 835 break; 836 837 case SLOWPROTOCOLS_SUBTYPE_MARKER: 838 if (ifp->if_agrprivate) { 839 ieee8023ad_marker_input(ifp, m); 840 return; 841 } 842 break; 843 #endif /* NAGR > 0 */ 844 default: 845 if (subtype == 0 || subtype > 10) { 846 /* illegal value */ 847 m_freem(m); 848 return; 849 } 850 /* unknown subtype */ 851 break; 852 } 853 /* FALLTHROUGH */ 854 } 855 default: 856 if (m->m_flags & M_PROMISC) { 857 m_freem(m); 858 return; 859 } 860 } 861 862 /* If the CRC is still on the packet, trim it off. */ 863 if (m->m_flags & M_HASFCS) { 864 m_adj(m, -ETHER_CRC_LEN); 865 m->m_flags &= ~M_HASFCS; 866 } 867 868 if (etype > ETHERMTU + sizeof (struct ether_header)) { 869 /* Strip off the Ethernet header. */ 870 m_adj(m, sizeof(struct ether_header)); 871 872 switch (etype) { 873 #ifdef INET 874 case ETHERTYPE_IP: 875 #ifdef GATEWAY 876 if (ipflow_fastforward(m)) 877 return; 878 #endif 879 schednetisr(NETISR_IP); 880 inq = &ipintrq; 881 break; 882 883 case ETHERTYPE_ARP: 884 schednetisr(NETISR_ARP); 885 inq = &arpintrq; 886 break; 887 888 case ETHERTYPE_REVARP: 889 revarpinput(m); /* XXX queue? */ 890 return; 891 #endif 892 #ifdef INET6 893 case ETHERTYPE_IPV6: 894 schednetisr(NETISR_IPV6); 895 inq = &ip6intrq; 896 break; 897 #endif 898 #ifdef IPX 899 case ETHERTYPE_IPX: 900 schednetisr(NETISR_IPX); 901 inq = &ipxintrq; 902 break; 903 #endif 904 #ifdef NETATALK 905 case ETHERTYPE_ATALK: 906 schednetisr(NETISR_ATALK); 907 inq = &atintrq1; 908 break; 909 case ETHERTYPE_AARP: 910 /* probably this should be done with a NETISR as well */ 911 aarpinput(ifp, m); /* XXX */ 912 return; 913 #endif /* NETATALK */ 914 default: 915 m_freem(m); 916 return; 917 } 918 } else { 919 #if defined (ISO) || defined (LLC) || defined (NETATALK) 920 l = (struct llc *)(eh+1); 921 switch (l->llc_dsap) { 922 #ifdef NETATALK 923 case LLC_SNAP_LSAP: 924 switch (l->llc_control) { 925 case LLC_UI: 926 if (l->llc_ssap != LLC_SNAP_LSAP) { 927 goto dropanyway; 928 } 929 930 if (Bcmp(&(l->llc_snap_org_code)[0], 931 at_org_code, sizeof(at_org_code)) == 0 && 932 ntohs(l->llc_snap_ether_type) == 933 ETHERTYPE_ATALK) { 934 inq = &atintrq2; 935 m_adj(m, sizeof(struct ether_header) 936 + sizeof(struct llc)); 937 schednetisr(NETISR_ATALK); 938 break; 939 } 940 941 if (Bcmp(&(l->llc_snap_org_code)[0], 942 aarp_org_code, 943 sizeof(aarp_org_code)) == 0 && 944 ntohs(l->llc_snap_ether_type) == 945 ETHERTYPE_AARP) { 946 m_adj( m, sizeof(struct ether_header) 947 + sizeof(struct llc)); 948 aarpinput(ifp, m); /* XXX */ 949 return; 950 } 951 952 default: 953 goto dropanyway; 954 } 955 break; 956 #endif /* NETATALK */ 957 #ifdef ISO 958 case LLC_ISO_LSAP: 959 switch (l->llc_control) { 960 case LLC_UI: 961 /* LLC_UI_P forbidden in class 1 service */ 962 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 963 (l->llc_ssap == LLC_ISO_LSAP)) { 964 /* LSAP for ISO */ 965 /* XXX length computation?? */ 966 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 967 m_adj(m, etype - m->m_pkthdr.len); 968 969 #ifdef ARGO_DEBUG 970 if (argo_debug[D_ETHER]) 971 printf("clnp packet"); 972 #endif 973 schednetisr(NETISR_ISO); 974 inq = &clnlintrq; 975 break; 976 } 977 goto dropanyway; 978 979 case LLC_XID: 980 case LLC_XID_P: 981 if(m->m_len < 6 + sizeof(struct ether_header)) 982 /* XXX m_pullup? */ 983 goto dropanyway; 984 l->llc_window = 0; 985 l->llc_fid = 9; 986 l->llc_class = 1; 987 l->llc_dsap = l->llc_ssap = 0; 988 /* Fall through to */ 989 case LLC_TEST: 990 case LLC_TEST_P: 991 { 992 struct sockaddr sa; 993 struct ether_header *eh2; 994 int i; 995 u_char c = l->llc_dsap; 996 997 l->llc_dsap = l->llc_ssap; 998 l->llc_ssap = c; 999 m_adj(m, sizeof(struct ether_header)); 1000 /* XXX we can optimize here? */ 1001 if (m->m_flags & (M_BCAST | M_MCAST)) 1002 bcopy(LLADDR(ifp->if_sadl), 1003 (caddr_t)eh->ether_dhost, 6); 1004 sa.sa_family = AF_UNSPEC; 1005 sa.sa_len = sizeof(sa); 1006 eh2 = (struct ether_header *)sa.sa_data; 1007 for (i = 0; i < 6; i++) { 1008 eh2->ether_shost[i] = c = 1009 eh->ether_dhost[i]; 1010 eh2->ether_dhost[i] = 1011 eh->ether_dhost[i] = 1012 eh->ether_shost[i]; 1013 eh->ether_shost[i] = c; 1014 } 1015 ifp->if_output(ifp, m, &sa, NULL); 1016 return; 1017 } 1018 default: 1019 m_freem(m); 1020 return; 1021 } 1022 break; 1023 #endif /* ISO */ 1024 dropanyway: 1025 default: 1026 m_freem(m); 1027 return; 1028 } 1029 #else /* ISO || LLC || NETATALK*/ 1030 m_freem(m); 1031 return; 1032 #endif /* ISO || LLC || NETATALK*/ 1033 } 1034 1035 if (IF_QFULL(inq)) { 1036 IF_DROP(inq); 1037 m_freem(m); 1038 } else 1039 IF_ENQUEUE(inq, m); 1040 } 1041 1042 /* 1043 * Convert Ethernet address to printable (loggable) representation. 1044 */ 1045 char * 1046 ether_sprintf(const u_char *ap) 1047 { 1048 static char etherbuf[3 * ETHER_ADDR_LEN]; 1049 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1050 return etherbuf; 1051 } 1052 1053 char * 1054 ether_snprintf(char *buf, size_t len, const u_char *ap) 1055 { 1056 char *cp = buf; 1057 size_t i; 1058 1059 for (i = 0; i < len / 3; i++) { 1060 *cp++ = hexdigits[*ap >> 4]; 1061 *cp++ = hexdigits[*ap++ & 0xf]; 1062 *cp++ = ':'; 1063 } 1064 *--cp = '\0'; 1065 return buf; 1066 } 1067 1068 /* 1069 * Perform common duties while attaching to interface list 1070 */ 1071 void 1072 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1073 { 1074 struct ethercom *ec = (struct ethercom *)ifp; 1075 1076 ifp->if_type = IFT_ETHER; 1077 ifp->if_addrlen = ETHER_ADDR_LEN; 1078 ifp->if_hdrlen = ETHER_HDR_LEN; 1079 ifp->if_dlt = DLT_EN10MB; 1080 ifp->if_mtu = ETHERMTU; 1081 ifp->if_output = ether_output; 1082 ifp->if_input = ether_input; 1083 if (ifp->if_baudrate == 0) 1084 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1085 1086 if_alloc_sadl(ifp); 1087 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1088 1089 LIST_INIT(&ec->ec_multiaddrs); 1090 ifp->if_broadcastaddr = etherbroadcastaddr; 1091 #if NBPFILTER > 0 1092 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1093 #endif 1094 #ifdef MBUFTRACE 1095 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1096 sizeof(ec->ec_tx_mowner.mo_name)); 1097 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1098 sizeof(ec->ec_tx_mowner.mo_descr)); 1099 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1100 sizeof(ec->ec_rx_mowner.mo_name)); 1101 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1102 sizeof(ec->ec_rx_mowner.mo_descr)); 1103 MOWNER_ATTACH(&ec->ec_tx_mowner); 1104 MOWNER_ATTACH(&ec->ec_rx_mowner); 1105 ifp->if_mowner = &ec->ec_tx_mowner; 1106 #endif 1107 } 1108 1109 void 1110 ether_ifdetach(struct ifnet *ifp) 1111 { 1112 struct ethercom *ec = (void *) ifp; 1113 struct ether_multi *enm; 1114 int s; 1115 1116 #if NBRIDGE > 0 1117 if (ifp->if_bridge) 1118 bridge_ifdetach(ifp); 1119 #endif 1120 1121 #if NBPFILTER > 0 1122 bpfdetach(ifp); 1123 #endif 1124 1125 #if NVLAN > 0 1126 if (ec->ec_nvlans) 1127 vlan_ifdetach(ifp); 1128 #endif 1129 1130 s = splnet(); 1131 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1132 LIST_REMOVE(enm, enm_list); 1133 free(enm, M_IFMADDR); 1134 ec->ec_multicnt--; 1135 } 1136 splx(s); 1137 1138 #if 0 /* done in if_detach() */ 1139 if_free_sadl(ifp); 1140 #endif 1141 1142 MOWNER_DETACH(&ec->ec_rx_mowner); 1143 MOWNER_DETACH(&ec->ec_tx_mowner); 1144 } 1145 1146 #if 0 1147 /* 1148 * This is for reference. We have a table-driven version 1149 * of the little-endian crc32 generator, which is faster 1150 * than the double-loop. 1151 */ 1152 u_int32_t 1153 ether_crc32_le(const u_int8_t *buf, size_t len) 1154 { 1155 u_int32_t c, crc, carry; 1156 size_t i, j; 1157 1158 crc = 0xffffffffU; /* initial value */ 1159 1160 for (i = 0; i < len; i++) { 1161 c = buf[i]; 1162 for (j = 0; j < 8; j++) { 1163 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1164 crc >>= 1; 1165 c >>= 1; 1166 if (carry) 1167 crc = (crc ^ ETHER_CRC_POLY_LE); 1168 } 1169 } 1170 1171 return (crc); 1172 } 1173 #else 1174 u_int32_t 1175 ether_crc32_le(const u_int8_t *buf, size_t len) 1176 { 1177 static const u_int32_t crctab[] = { 1178 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1179 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1180 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1181 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1182 }; 1183 u_int32_t crc; 1184 size_t i; 1185 1186 crc = 0xffffffffU; /* initial value */ 1187 1188 for (i = 0; i < len; i++) { 1189 crc ^= buf[i]; 1190 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1191 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1192 } 1193 1194 return (crc); 1195 } 1196 #endif 1197 1198 u_int32_t 1199 ether_crc32_be(const u_int8_t *buf, size_t len) 1200 { 1201 u_int32_t c, crc, carry; 1202 size_t i, j; 1203 1204 crc = 0xffffffffU; /* initial value */ 1205 1206 for (i = 0; i < len; i++) { 1207 c = buf[i]; 1208 for (j = 0; j < 8; j++) { 1209 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1210 crc <<= 1; 1211 c >>= 1; 1212 if (carry) 1213 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1214 } 1215 } 1216 1217 return (crc); 1218 } 1219 1220 #ifdef INET 1221 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1222 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1223 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1224 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1225 #endif 1226 #ifdef INET6 1227 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1228 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1229 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1230 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1231 #endif 1232 1233 /* 1234 * ether_aton implementation, not using a static buffer. 1235 */ 1236 int 1237 ether_nonstatic_aton(u_char *dest, char *str) 1238 { 1239 int i; 1240 char *cp = str; 1241 u_char val[6]; 1242 1243 #define set_value \ 1244 if (*cp > '9' && *cp < 'a') \ 1245 *cp -= 'A' - 10; \ 1246 else if (*cp > '9') \ 1247 *cp -= 'a' - 10; \ 1248 else \ 1249 *cp -= '0' 1250 1251 for (i = 0; i < 6; i++, cp++) { 1252 if (!isxdigit(*cp)) 1253 return (1); 1254 set_value; 1255 val[i] = *cp++; 1256 if (isxdigit(*cp)) { 1257 set_value; 1258 val[i] *= 16; 1259 val[i] += *cp++; 1260 } 1261 if (*cp == ':' || i == 5) 1262 continue; 1263 else 1264 return 1; 1265 } 1266 memcpy(dest, val, 6); 1267 1268 return 0; 1269 } 1270 1271 1272 /* 1273 * Convert a sockaddr into an Ethernet address or range of Ethernet 1274 * addresses. 1275 */ 1276 int 1277 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1278 u_int8_t addrhi[ETHER_ADDR_LEN]) 1279 { 1280 #ifdef INET 1281 struct sockaddr_in *sin; 1282 #endif /* INET */ 1283 #ifdef INET6 1284 struct sockaddr_in6 *sin6; 1285 #endif /* INET6 */ 1286 1287 switch (sa->sa_family) { 1288 1289 case AF_UNSPEC: 1290 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1291 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1292 break; 1293 1294 #ifdef INET 1295 case AF_INET: 1296 sin = satosin(sa); 1297 if (sin->sin_addr.s_addr == INADDR_ANY) { 1298 /* 1299 * An IP address of INADDR_ANY means listen to 1300 * or stop listening to all of the Ethernet 1301 * multicast addresses used for IP. 1302 * (This is for the sake of IP multicast routers.) 1303 */ 1304 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1305 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1306 } 1307 else { 1308 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1309 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1310 } 1311 break; 1312 #endif 1313 #ifdef INET6 1314 case AF_INET6: 1315 sin6 = satosin6(sa); 1316 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1317 /* 1318 * An IP6 address of 0 means listen to or stop 1319 * listening to all of the Ethernet multicast 1320 * address used for IP6. 1321 * (This is used for multicast routers.) 1322 */ 1323 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1324 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1325 } else { 1326 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1327 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1328 } 1329 break; 1330 #endif 1331 1332 default: 1333 return (EAFNOSUPPORT); 1334 } 1335 return (0); 1336 } 1337 1338 /* 1339 * Add an Ethernet multicast address or range of addresses to the list for a 1340 * given interface. 1341 */ 1342 int 1343 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1344 { 1345 struct ether_multi *enm; 1346 u_char addrlo[ETHER_ADDR_LEN]; 1347 u_char addrhi[ETHER_ADDR_LEN]; 1348 int s = splnet(), error; 1349 1350 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1351 if (error != 0) { 1352 splx(s); 1353 return (error); 1354 } 1355 1356 /* 1357 * Verify that we have valid Ethernet multicast addresses. 1358 */ 1359 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1360 splx(s); 1361 return (EINVAL); 1362 } 1363 /* 1364 * See if the address range is already in the list. 1365 */ 1366 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1367 if (enm != NULL) { 1368 /* 1369 * Found it; just increment the reference count. 1370 */ 1371 ++enm->enm_refcount; 1372 splx(s); 1373 return (0); 1374 } 1375 /* 1376 * New address or range; malloc a new multicast record 1377 * and link it into the interface's multicast list. 1378 */ 1379 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1380 if (enm == NULL) { 1381 splx(s); 1382 return (ENOBUFS); 1383 } 1384 bcopy(addrlo, enm->enm_addrlo, 6); 1385 bcopy(addrhi, enm->enm_addrhi, 6); 1386 enm->enm_refcount = 1; 1387 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1388 ec->ec_multicnt++; 1389 splx(s); 1390 /* 1391 * Return ENETRESET to inform the driver that the list has changed 1392 * and its reception filter should be adjusted accordingly. 1393 */ 1394 return (ENETRESET); 1395 } 1396 1397 /* 1398 * Delete a multicast address record. 1399 */ 1400 int 1401 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1402 { 1403 struct ether_multi *enm; 1404 u_char addrlo[ETHER_ADDR_LEN]; 1405 u_char addrhi[ETHER_ADDR_LEN]; 1406 int s = splnet(), error; 1407 1408 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1409 if (error != 0) { 1410 splx(s); 1411 return (error); 1412 } 1413 1414 /* 1415 * Look ur the address in our list. 1416 */ 1417 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1418 if (enm == NULL) { 1419 splx(s); 1420 return (ENXIO); 1421 } 1422 if (--enm->enm_refcount != 0) { 1423 /* 1424 * Still some claims to this record. 1425 */ 1426 splx(s); 1427 return (0); 1428 } 1429 /* 1430 * No remaining claims to this record; unlink and free it. 1431 */ 1432 LIST_REMOVE(enm, enm_list); 1433 free(enm, M_IFMADDR); 1434 ec->ec_multicnt--; 1435 splx(s); 1436 /* 1437 * Return ENETRESET to inform the driver that the list has changed 1438 * and its reception filter should be adjusted accordingly. 1439 */ 1440 return (ENETRESET); 1441 } 1442 1443 /* 1444 * Common ioctls for Ethernet interfaces. Note, we must be 1445 * called at splnet(). 1446 */ 1447 int 1448 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1449 { 1450 struct ethercom *ec = (void *) ifp; 1451 struct ifreq *ifr = (struct ifreq *)data; 1452 struct ifaddr *ifa = (struct ifaddr *)data; 1453 int error = 0; 1454 1455 switch (cmd) { 1456 case SIOCSIFADDR: 1457 ifp->if_flags |= IFF_UP; 1458 switch (ifa->ifa_addr->sa_family) { 1459 case AF_LINK: 1460 { 1461 struct sockaddr_dl *sdl = 1462 (struct sockaddr_dl *) ifa->ifa_addr; 1463 1464 if (sdl->sdl_type != IFT_ETHER || 1465 sdl->sdl_alen != ifp->if_addrlen) { 1466 error = EINVAL; 1467 break; 1468 } 1469 1470 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1471 ifp->if_addrlen); 1472 1473 /* Set new address. */ 1474 error = (*ifp->if_init)(ifp); 1475 break; 1476 } 1477 #ifdef INET 1478 case AF_INET: 1479 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1480 (error = (*ifp->if_init)(ifp)) != 0) 1481 break; 1482 arp_ifinit(ifp, ifa); 1483 break; 1484 #endif /* INET */ 1485 default: 1486 if ((ifp->if_flags & IFF_RUNNING) == 0) 1487 error = (*ifp->if_init)(ifp); 1488 break; 1489 } 1490 break; 1491 1492 case SIOCGIFADDR: 1493 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1494 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1495 break; 1496 1497 case SIOCSIFMTU: 1498 { 1499 int maxmtu; 1500 1501 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1502 maxmtu = ETHERMTU_JUMBO; 1503 else 1504 maxmtu = ETHERMTU; 1505 1506 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1507 error = EINVAL; 1508 else { 1509 ifp->if_mtu = ifr->ifr_mtu; 1510 1511 /* Make sure the device notices the MTU change. */ 1512 if (ifp->if_flags & IFF_UP) 1513 error = (*ifp->if_init)(ifp); 1514 } 1515 break; 1516 } 1517 1518 case SIOCSIFFLAGS: 1519 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1520 /* 1521 * If interface is marked down and it is running, 1522 * then stop and disable it. 1523 */ 1524 (*ifp->if_stop)(ifp, 1); 1525 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1526 /* 1527 * If interface is marked up and it is stopped, then 1528 * start it. 1529 */ 1530 error = (*ifp->if_init)(ifp); 1531 } else if ((ifp->if_flags & IFF_UP) != 0) { 1532 /* 1533 * Reset the interface to pick up changes in any other 1534 * flags that affect the hardware state. 1535 */ 1536 error = (*ifp->if_init)(ifp); 1537 } 1538 break; 1539 1540 case SIOCADDMULTI: 1541 error = ether_addmulti(ifr, ec); 1542 break; 1543 1544 case SIOCDELMULTI: 1545 error = ether_delmulti(ifr, ec); 1546 break; 1547 1548 default: 1549 error = ENOTTY; 1550 } 1551 1552 return (error); 1553 } 1554
Indexes created Tue Sep 23 07:09:52 GMT 2025