if_ethersubr.c revision 1.136
1 /* $NetBSD: if_ethersubr.c,v 1.136 2006/09/07 02:40:33 dogcow 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 1.136 2006/09/07 02:40:33 dogcow 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 if(m->m_flags & M_PROTO1) { 702 m->m_flags &= ~M_PROTO1; 703 } else { 704 /* clear M_PROMISC, in case the packets comes from a vlan */ 705 m->m_flags &= ~M_PROMISC; 706 m = bridge_input(ifp, m); 707 if (m == NULL) 708 return; 709 710 /* 711 * Bridge has determined that the packet is for us. 712 * Update our interface pointer -- we may have had 713 * to "bridge" the packet locally. 714 */ 715 ifp = m->m_pkthdr.rcvif; 716 } 717 } else 718 #endif /* NBRIDGE > 0 */ 719 { 720 721 #if NCARP > 0 722 if (ifp->if_carp && ifp->if_type != IFT_CARP && 723 (carp_input(m, (u_int8_t *)&eh->ether_shost, 724 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0)) { 725 return; 726 } 727 #endif /* NCARP > 0 */ 728 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 729 (ifp->if_flags & IFF_PROMISC) != 0 && 730 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 731 ETHER_ADDR_LEN) != 0) { 732 m->m_flags |= M_PROMISC; 733 } 734 } 735 736 #ifdef PFIL_HOOKS 737 if ((m->m_flags & M_PROMISC) == 0) { 738 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 739 return; 740 if (m == NULL) 741 return; 742 743 eh = mtod(m, struct ether_header *); 744 etype = ntohs(eh->ether_type); 745 } 746 #endif 747 748 /* 749 * If VLANs are configured on the interface, check to 750 * see if the device performed the decapsulation and 751 * provided us with the tag. 752 */ 753 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 754 #if NVLAN > 0 755 /* 756 * vlan_input() will either recursively call ether_input() 757 * or drop the packet. 758 */ 759 vlan_input(ifp, m); 760 #else 761 m_freem(m); 762 #endif 763 return; 764 } 765 766 #if NAGR > 0 767 if (ifp->if_agrprivate && 768 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 769 m->m_flags &= ~M_PROMISC; 770 agr_input(ifp, m); 771 return; 772 } 773 #endif /* NAGR > 0 */ 774 775 /* 776 * Handle protocols that expect to have the Ethernet header 777 * (and possibly FCS) intact. 778 */ 779 switch (etype) { 780 #if NVLAN > 0 781 case ETHERTYPE_VLAN: 782 /* 783 * vlan_input() will either recursively call ether_input() 784 * or drop the packet. 785 */ 786 if (((struct ethercom *)ifp)->ec_nvlans != 0) 787 vlan_input(ifp, m); 788 else 789 m_freem(m); 790 return; 791 #endif /* NVLAN > 0 */ 792 #if NPPPOE > 0 793 case ETHERTYPE_PPPOEDISC: 794 case ETHERTYPE_PPPOE: 795 if (m->m_flags & M_PROMISC) { 796 m_freem(m); 797 return; 798 } 799 #ifndef PPPOE_SERVER 800 if (m->m_flags & (M_MCAST | M_BCAST)) { 801 m_freem(m); 802 return; 803 } 804 #endif 805 806 if (etype == ETHERTYPE_PPPOEDISC) 807 inq = &ppoediscinq; 808 else 809 inq = &ppoeinq; 810 if (IF_QFULL(inq)) { 811 IF_DROP(inq); 812 m_freem(m); 813 } else 814 IF_ENQUEUE(inq, m); 815 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 816 if (!callout_pending(&pppoe_softintr)) 817 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 818 #else 819 softintr_schedule(pppoe_softintr); 820 #endif 821 return; 822 #endif /* NPPPOE > 0 */ 823 case ETHERTYPE_SLOWPROTOCOLS: { 824 uint8_t subtype; 825 826 #if defined(DIAGNOSTIC) 827 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 828 panic("ether_input: too short slow protocol packet"); 829 } 830 #endif 831 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 832 switch (subtype) { 833 #if NAGR > 0 834 case SLOWPROTOCOLS_SUBTYPE_LACP: 835 if (ifp->if_agrprivate) { 836 ieee8023ad_lacp_input(ifp, m); 837 return; 838 } 839 break; 840 841 case SLOWPROTOCOLS_SUBTYPE_MARKER: 842 if (ifp->if_agrprivate) { 843 ieee8023ad_marker_input(ifp, m); 844 return; 845 } 846 break; 847 #endif /* NAGR > 0 */ 848 default: 849 if (subtype == 0 || subtype > 10) { 850 /* illegal value */ 851 m_freem(m); 852 return; 853 } 854 /* unknown subtype */ 855 break; 856 } 857 /* FALLTHROUGH */ 858 } 859 default: 860 if (m->m_flags & M_PROMISC) { 861 m_freem(m); 862 return; 863 } 864 } 865 866 /* Strip off the Ethernet header. */ 867 m_adj(m, sizeof(struct ether_header)); 868 869 /* If the CRC is still on the packet, trim it off. */ 870 if (m->m_flags & M_HASFCS) { 871 m_adj(m, -ETHER_CRC_LEN); 872 m->m_flags &= ~M_HASFCS; 873 } 874 875 switch (etype) { 876 #ifdef INET 877 case ETHERTYPE_IP: 878 #ifdef GATEWAY 879 if (ipflow_fastforward(m)) 880 return; 881 #endif 882 schednetisr(NETISR_IP); 883 inq = &ipintrq; 884 break; 885 886 case ETHERTYPE_ARP: 887 schednetisr(NETISR_ARP); 888 inq = &arpintrq; 889 break; 890 891 case ETHERTYPE_REVARP: 892 revarpinput(m); /* XXX queue? */ 893 return; 894 #endif 895 #ifdef INET6 896 case ETHERTYPE_IPV6: 897 schednetisr(NETISR_IPV6); 898 inq = &ip6intrq; 899 break; 900 #endif 901 #ifdef IPX 902 case ETHERTYPE_IPX: 903 schednetisr(NETISR_IPX); 904 inq = &ipxintrq; 905 break; 906 #endif 907 #ifdef NETATALK 908 case ETHERTYPE_ATALK: 909 schednetisr(NETISR_ATALK); 910 inq = &atintrq1; 911 break; 912 case ETHERTYPE_AARP: 913 /* probably this should be done with a NETISR as well */ 914 aarpinput(ifp, m); /* XXX */ 915 return; 916 #endif /* NETATALK */ 917 default: 918 #if defined (ISO) || defined (LLC) || defined (NETATALK) 919 if (etype > ETHERMTU) 920 goto dropanyway; 921 l = mtod(m, struct llc *); 922 switch (l->llc_dsap) { 923 #ifdef NETATALK 924 case LLC_SNAP_LSAP: 925 switch (l->llc_control) { 926 case LLC_UI: 927 if (l->llc_ssap != LLC_SNAP_LSAP) { 928 goto dropanyway; 929 } 930 931 if (Bcmp(&(l->llc_snap_org_code)[0], 932 at_org_code, sizeof(at_org_code)) == 0 && 933 ntohs(l->llc_snap_ether_type) == 934 ETHERTYPE_ATALK) { 935 inq = &atintrq2; 936 m_adj(m, 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 llc)); 947 aarpinput(ifp, m); /* XXX */ 948 return; 949 } 950 951 default: 952 goto dropanyway; 953 } 954 break; 955 #endif /* NETATALK */ 956 #ifdef ISO 957 case LLC_ISO_LSAP: 958 switch (l->llc_control) { 959 case LLC_UI: 960 /* LLC_UI_P forbidden in class 1 service */ 961 if ((l->llc_dsap == LLC_ISO_LSAP) && 962 (l->llc_ssap == LLC_ISO_LSAP)) { 963 /* LSAP for ISO */ 964 if (m->m_pkthdr.len > etype) 965 m_adj(m, etype - m->m_pkthdr.len); 966 m->m_data += 3; /* XXX */ 967 m->m_len -= 3; /* XXX */ 968 m->m_pkthdr.len -= 3; /* XXX */ 969 M_PREPEND(m, sizeof *eh, M_DONTWAIT); 970 if (m == 0) 971 return; 972 *mtod(m, struct ether_header *) = *eh; 973 #ifdef ARGO_DEBUG 974 if (argo_debug[D_ETHER]) 975 printf("clnp packet"); 976 #endif 977 schednetisr(NETISR_ISO); 978 inq = &clnlintrq; 979 break; 980 } 981 goto dropanyway; 982 983 case LLC_XID: 984 case LLC_XID_P: 985 if(m->m_len < 6) 986 goto dropanyway; 987 l->llc_window = 0; 988 l->llc_fid = 9; 989 l->llc_class = 1; 990 l->llc_dsap = l->llc_ssap = 0; 991 /* Fall through to */ 992 case LLC_TEST: 993 case LLC_TEST_P: 994 { 995 struct sockaddr sa; 996 struct ether_header *eh2; 997 int i; 998 u_char c = l->llc_dsap; 999 1000 l->llc_dsap = l->llc_ssap; 1001 l->llc_ssap = c; 1002 if (m->m_flags & (M_BCAST | M_MCAST)) 1003 bcopy(LLADDR(ifp->if_sadl), 1004 (caddr_t)eh->ether_dhost, 6); 1005 sa.sa_family = AF_UNSPEC; 1006 sa.sa_len = sizeof(sa); 1007 eh2 = (struct ether_header *)sa.sa_data; 1008 for (i = 0; i < 6; i++) { 1009 eh2->ether_shost[i] = c = 1010 eh->ether_dhost[i]; 1011 eh2->ether_dhost[i] = 1012 eh->ether_dhost[i] = 1013 eh->ether_shost[i]; 1014 eh->ether_shost[i] = c; 1015 } 1016 ifp->if_output(ifp, m, &sa, NULL); 1017 return; 1018 } 1019 default: 1020 m_freem(m); 1021 return; 1022 } 1023 break; 1024 #endif /* ISO */ 1025 dropanyway: 1026 default: 1027 m_freem(m); 1028 return; 1029 } 1030 #else /* ISO || LLC || NETATALK*/ 1031 m_freem(m); 1032 return; 1033 #endif /* ISO || LLC || NETATALK*/ 1034 } 1035 1036 if (IF_QFULL(inq)) { 1037 IF_DROP(inq); 1038 m_freem(m); 1039 } else 1040 IF_ENQUEUE(inq, m); 1041 } 1042 1043 /* 1044 * Convert Ethernet address to printable (loggable) representation. 1045 */ 1046 char * 1047 ether_sprintf(const u_char *ap) 1048 { 1049 static char etherbuf[3 * ETHER_ADDR_LEN]; 1050 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1051 return etherbuf; 1052 } 1053 1054 char * 1055 ether_snprintf(char *buf, size_t len, const u_char *ap) 1056 { 1057 char *cp = buf; 1058 size_t i; 1059 1060 for (i = 0; i < len / 3; i++) { 1061 *cp++ = hexdigits[*ap >> 4]; 1062 *cp++ = hexdigits[*ap++ & 0xf]; 1063 *cp++ = ':'; 1064 } 1065 *--cp = '\0'; 1066 return buf; 1067 } 1068 1069 /* 1070 * Perform common duties while attaching to interface list 1071 */ 1072 void 1073 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1074 { 1075 struct ethercom *ec = (struct ethercom *)ifp; 1076 1077 ifp->if_type = IFT_ETHER; 1078 ifp->if_addrlen = ETHER_ADDR_LEN; 1079 ifp->if_hdrlen = ETHER_HDR_LEN; 1080 ifp->if_dlt = DLT_EN10MB; 1081 ifp->if_mtu = ETHERMTU; 1082 ifp->if_output = ether_output; 1083 ifp->if_input = ether_input; 1084 if (ifp->if_baudrate == 0) 1085 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1086 1087 if_alloc_sadl(ifp); 1088 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1089 1090 LIST_INIT(&ec->ec_multiaddrs); 1091 ifp->if_broadcastaddr = etherbroadcastaddr; 1092 #if NBPFILTER > 0 1093 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1094 #endif 1095 #ifdef MBUFTRACE 1096 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1097 sizeof(ec->ec_tx_mowner.mo_name)); 1098 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1099 sizeof(ec->ec_tx_mowner.mo_descr)); 1100 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1101 sizeof(ec->ec_rx_mowner.mo_name)); 1102 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1103 sizeof(ec->ec_rx_mowner.mo_descr)); 1104 MOWNER_ATTACH(&ec->ec_tx_mowner); 1105 MOWNER_ATTACH(&ec->ec_rx_mowner); 1106 ifp->if_mowner = &ec->ec_tx_mowner; 1107 #endif 1108 } 1109 1110 void 1111 ether_ifdetach(struct ifnet *ifp) 1112 { 1113 struct ethercom *ec = (void *) ifp; 1114 struct ether_multi *enm; 1115 int s; 1116 1117 #if NBRIDGE > 0 1118 if (ifp->if_bridge) 1119 bridge_ifdetach(ifp); 1120 #endif 1121 1122 #if NBPFILTER > 0 1123 bpfdetach(ifp); 1124 #endif 1125 1126 #if NVLAN > 0 1127 if (ec->ec_nvlans) 1128 vlan_ifdetach(ifp); 1129 #endif 1130 1131 s = splnet(); 1132 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1133 LIST_REMOVE(enm, enm_list); 1134 free(enm, M_IFMADDR); 1135 ec->ec_multicnt--; 1136 } 1137 splx(s); 1138 1139 #if 0 /* done in if_detach() */ 1140 if_free_sadl(ifp); 1141 #endif 1142 1143 MOWNER_DETACH(&ec->ec_rx_mowner); 1144 MOWNER_DETACH(&ec->ec_tx_mowner); 1145 } 1146 1147 #if 0 1148 /* 1149 * This is for reference. We have a table-driven version 1150 * of the little-endian crc32 generator, which is faster 1151 * than the double-loop. 1152 */ 1153 u_int32_t 1154 ether_crc32_le(const u_int8_t *buf, size_t len) 1155 { 1156 u_int32_t c, crc, carry; 1157 size_t i, j; 1158 1159 crc = 0xffffffffU; /* initial value */ 1160 1161 for (i = 0; i < len; i++) { 1162 c = buf[i]; 1163 for (j = 0; j < 8; j++) { 1164 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1165 crc >>= 1; 1166 c >>= 1; 1167 if (carry) 1168 crc = (crc ^ ETHER_CRC_POLY_LE); 1169 } 1170 } 1171 1172 return (crc); 1173 } 1174 #else 1175 u_int32_t 1176 ether_crc32_le(const u_int8_t *buf, size_t len) 1177 { 1178 static const u_int32_t crctab[] = { 1179 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1180 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1181 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1182 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1183 }; 1184 u_int32_t crc; 1185 size_t i; 1186 1187 crc = 0xffffffffU; /* initial value */ 1188 1189 for (i = 0; i < len; i++) { 1190 crc ^= buf[i]; 1191 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1192 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1193 } 1194 1195 return (crc); 1196 } 1197 #endif 1198 1199 u_int32_t 1200 ether_crc32_be(const u_int8_t *buf, size_t len) 1201 { 1202 u_int32_t c, crc, carry; 1203 size_t i, j; 1204 1205 crc = 0xffffffffU; /* initial value */ 1206 1207 for (i = 0; i < len; i++) { 1208 c = buf[i]; 1209 for (j = 0; j < 8; j++) { 1210 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1211 crc <<= 1; 1212 c >>= 1; 1213 if (carry) 1214 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1215 } 1216 } 1217 1218 return (crc); 1219 } 1220 1221 #ifdef INET 1222 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1223 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1224 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1225 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1226 #endif 1227 #ifdef INET6 1228 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1229 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1230 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1231 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1232 #endif 1233 1234 /* 1235 * Convert a sockaddr into an Ethernet address or range of Ethernet 1236 * addresses. 1237 */ 1238 int 1239 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1240 u_int8_t addrhi[ETHER_ADDR_LEN]) 1241 { 1242 #ifdef INET 1243 struct sockaddr_in *sin; 1244 #endif /* INET */ 1245 #ifdef INET6 1246 struct sockaddr_in6 *sin6; 1247 #endif /* INET6 */ 1248 1249 switch (sa->sa_family) { 1250 1251 case AF_UNSPEC: 1252 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1253 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1254 break; 1255 1256 #ifdef INET 1257 case AF_INET: 1258 sin = satosin(sa); 1259 if (sin->sin_addr.s_addr == INADDR_ANY) { 1260 /* 1261 * An IP address of INADDR_ANY means listen to 1262 * or stop listening to all of the Ethernet 1263 * multicast addresses used for IP. 1264 * (This is for the sake of IP multicast routers.) 1265 */ 1266 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1267 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1268 } 1269 else { 1270 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1271 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1272 } 1273 break; 1274 #endif 1275 #ifdef INET6 1276 case AF_INET6: 1277 sin6 = satosin6(sa); 1278 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1279 /* 1280 * An IP6 address of 0 means listen to or stop 1281 * listening to all of the Ethernet multicast 1282 * address used for IP6. 1283 * (This is used for multicast routers.) 1284 */ 1285 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1286 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1287 } else { 1288 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1289 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1290 } 1291 break; 1292 #endif 1293 1294 default: 1295 return (EAFNOSUPPORT); 1296 } 1297 return (0); 1298 } 1299 1300 /* 1301 * Add an Ethernet multicast address or range of addresses to the list for a 1302 * given interface. 1303 */ 1304 int 1305 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1306 { 1307 struct ether_multi *enm; 1308 u_char addrlo[ETHER_ADDR_LEN]; 1309 u_char addrhi[ETHER_ADDR_LEN]; 1310 int s = splnet(), error; 1311 1312 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1313 if (error != 0) { 1314 splx(s); 1315 return (error); 1316 } 1317 1318 /* 1319 * Verify that we have valid Ethernet multicast addresses. 1320 */ 1321 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1322 splx(s); 1323 return (EINVAL); 1324 } 1325 /* 1326 * See if the address range is already in the list. 1327 */ 1328 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1329 if (enm != NULL) { 1330 /* 1331 * Found it; just increment the reference count. 1332 */ 1333 ++enm->enm_refcount; 1334 splx(s); 1335 return (0); 1336 } 1337 /* 1338 * New address or range; malloc a new multicast record 1339 * and link it into the interface's multicast list. 1340 */ 1341 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1342 if (enm == NULL) { 1343 splx(s); 1344 return (ENOBUFS); 1345 } 1346 bcopy(addrlo, enm->enm_addrlo, 6); 1347 bcopy(addrhi, enm->enm_addrhi, 6); 1348 enm->enm_refcount = 1; 1349 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1350 ec->ec_multicnt++; 1351 splx(s); 1352 /* 1353 * Return ENETRESET to inform the driver that the list has changed 1354 * and its reception filter should be adjusted accordingly. 1355 */ 1356 return (ENETRESET); 1357 } 1358 1359 /* 1360 * Delete a multicast address record. 1361 */ 1362 int 1363 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1364 { 1365 struct ether_multi *enm; 1366 u_char addrlo[ETHER_ADDR_LEN]; 1367 u_char addrhi[ETHER_ADDR_LEN]; 1368 int s = splnet(), error; 1369 1370 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1371 if (error != 0) { 1372 splx(s); 1373 return (error); 1374 } 1375 1376 /* 1377 * Look ur the address in our list. 1378 */ 1379 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1380 if (enm == NULL) { 1381 splx(s); 1382 return (ENXIO); 1383 } 1384 if (--enm->enm_refcount != 0) { 1385 /* 1386 * Still some claims to this record. 1387 */ 1388 splx(s); 1389 return (0); 1390 } 1391 /* 1392 * No remaining claims to this record; unlink and free it. 1393 */ 1394 LIST_REMOVE(enm, enm_list); 1395 free(enm, M_IFMADDR); 1396 ec->ec_multicnt--; 1397 splx(s); 1398 /* 1399 * Return ENETRESET to inform the driver that the list has changed 1400 * and its reception filter should be adjusted accordingly. 1401 */ 1402 return (ENETRESET); 1403 } 1404 1405 /* 1406 * Common ioctls for Ethernet interfaces. Note, we must be 1407 * called at splnet(). 1408 */ 1409 int 1410 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1411 { 1412 struct ethercom *ec = (void *) ifp; 1413 struct ifreq *ifr = (struct ifreq *)data; 1414 struct ifaddr *ifa = (struct ifaddr *)data; 1415 int error = 0; 1416 1417 switch (cmd) { 1418 case SIOCSIFADDR: 1419 ifp->if_flags |= IFF_UP; 1420 switch (ifa->ifa_addr->sa_family) { 1421 case AF_LINK: 1422 { 1423 struct sockaddr_dl *sdl = 1424 (struct sockaddr_dl *) ifa->ifa_addr; 1425 1426 if (sdl->sdl_type != IFT_ETHER || 1427 sdl->sdl_alen != ifp->if_addrlen) { 1428 error = EINVAL; 1429 break; 1430 } 1431 1432 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1433 ifp->if_addrlen); 1434 1435 /* Set new address. */ 1436 error = (*ifp->if_init)(ifp); 1437 break; 1438 } 1439 #ifdef INET 1440 case AF_INET: 1441 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1442 (error = (*ifp->if_init)(ifp)) != 0) 1443 break; 1444 arp_ifinit(ifp, ifa); 1445 break; 1446 #endif /* INET */ 1447 default: 1448 if ((ifp->if_flags & IFF_RUNNING) == 0) 1449 error = (*ifp->if_init)(ifp); 1450 break; 1451 } 1452 break; 1453 1454 case SIOCGIFADDR: 1455 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1456 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1457 break; 1458 1459 case SIOCSIFMTU: 1460 { 1461 int maxmtu; 1462 1463 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1464 maxmtu = ETHERMTU_JUMBO; 1465 else 1466 maxmtu = ETHERMTU; 1467 1468 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1469 error = EINVAL; 1470 else { 1471 ifp->if_mtu = ifr->ifr_mtu; 1472 1473 /* Make sure the device notices the MTU change. */ 1474 if (ifp->if_flags & IFF_UP) 1475 error = (*ifp->if_init)(ifp); 1476 } 1477 break; 1478 } 1479 1480 case SIOCSIFFLAGS: 1481 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1482 /* 1483 * If interface is marked down and it is running, 1484 * then stop and disable it. 1485 */ 1486 (*ifp->if_stop)(ifp, 1); 1487 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1488 /* 1489 * If interface is marked up and it is stopped, then 1490 * start it. 1491 */ 1492 error = (*ifp->if_init)(ifp); 1493 } else if ((ifp->if_flags & IFF_UP) != 0) { 1494 /* 1495 * Reset the interface to pick up changes in any other 1496 * flags that affect the hardware state. 1497 */ 1498 error = (*ifp->if_init)(ifp); 1499 } 1500 break; 1501 1502 case SIOCADDMULTI: 1503 error = ether_addmulti(ifr, ec); 1504 break; 1505 1506 case SIOCDELMULTI: 1507 error = ether_delmulti(ifr, ec); 1508 break; 1509 1510 default: 1511 error = ENOTTY; 1512 } 1513 1514 return (error); 1515 } 1516
Indexes created Tue Sep 30 10:09:55 GMT 2025