if_ethersubr.c revision 1.148.2.2
1 /* $NetBSD: if_ethersubr.c,v 1.148.2.2 2007/06/17 21:31:49 ad 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 1.148.2.2 2007/06/17 21:31:49 ad 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 #include <sys/intr.h> 94 95 #include <machine/cpu.h> 96 97 #include <net/if.h> 98 #include <net/netisr.h> 99 #include <net/route.h> 100 #include <net/if_llc.h> 101 #include <net/if_dl.h> 102 #include <net/if_types.h> 103 104 #if NARP == 0 105 /* 106 * XXX there should really be a way to issue this warning from within config(8) 107 */ 108 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. 109 #endif 110 111 #if NBPFILTER > 0 112 #include <net/bpf.h> 113 #endif 114 115 #include <net/if_ether.h> 116 #if NVLAN > 0 117 #include <net/if_vlanvar.h> 118 #endif 119 120 #if NPPPOE > 0 121 #include <net/if_pppoe.h> 122 #endif 123 124 #if NAGR > 0 125 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 126 #include <net/agr/ieee8023ad.h> 127 #include <net/agr/if_agrvar.h> 128 #endif 129 130 #if NBRIDGE > 0 131 #include <net/if_bridgevar.h> 132 #endif 133 134 #include <netinet/in.h> 135 #ifdef INET 136 #include <netinet/in_var.h> 137 #endif 138 #include <netinet/if_inarp.h> 139 140 #ifdef INET6 141 #ifndef INET 142 #include <netinet/in.h> 143 #endif 144 #include <netinet6/in6_var.h> 145 #include <netinet6/nd6.h> 146 #endif 147 148 149 #include "carp.h" 150 #if NCARP > 0 151 #include <netinet/ip_carp.h> 152 #endif 153 154 #ifdef IPX 155 #include <netipx/ipx.h> 156 #include <netipx/ipx_if.h> 157 #endif 158 159 #ifdef ISO 160 #include <netiso/argo_debug.h> 161 #include <netiso/iso.h> 162 #include <netiso/iso_var.h> 163 #include <netiso/iso_snpac.h> 164 #endif 165 166 167 168 #ifdef NETATALK 169 #include <netatalk/at.h> 170 #include <netatalk/at_var.h> 171 #include <netatalk/at_extern.h> 172 173 #define llc_snap_org_code llc_un.type_snap.org_code 174 #define llc_snap_ether_type llc_un.type_snap.ether_type 175 176 extern u_char at_org_code[3]; 177 extern u_char aarp_org_code[3]; 178 #endif /* NETATALK */ 179 180 static struct timeval bigpktppslim_last; 181 static int bigpktppslim = 2; /* XXX */ 182 static int bigpktpps_count; 183 184 185 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 186 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 187 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 188 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 189 #define senderr(e) { error = (e); goto bad;} 190 191 static int ether_output(struct ifnet *, struct mbuf *, 192 const struct sockaddr *, struct rtentry *); 193 194 /* 195 * Ethernet output routine. 196 * Encapsulate a packet of type family for the local net. 197 * Assumes that ifp is actually pointer to ethercom structure. 198 */ 199 static int 200 ether_output(struct ifnet *ifp0, struct mbuf *m0, const struct sockaddr *dst, 201 struct rtentry *rt0) 202 { 203 u_int16_t etype = 0; 204 int error = 0, hdrcmplt = 0; 205 uint8_t esrc[6], edst[6]; 206 struct mbuf *m = m0; 207 struct rtentry *rt; 208 struct mbuf *mcopy = (struct mbuf *)0; 209 struct ether_header *eh; 210 struct ifnet *ifp = ifp0; 211 ALTQ_DECL(struct altq_pktattr pktattr;) 212 #ifdef INET 213 struct arphdr *ah; 214 #endif /* INET */ 215 #ifdef NETATALK 216 struct at_ifaddr *aa; 217 #endif /* NETATALK */ 218 219 #ifdef MBUFTRACE 220 m_claimm(m, ifp->if_mowner); 221 #endif 222 223 #if NCARP > 0 224 if (ifp->if_type == IFT_CARP) { 225 struct ifaddr *ifa; 226 227 /* loop back if this is going to the carp interface */ 228 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 229 (ifa = ifa_ifwithaddr(dst)) != NULL && 230 ifa->ifa_ifp == ifp0) 231 return looutput(ifp0, m, dst, rt0); 232 233 ifp = ifp->if_carpdev; 234 /* ac = (struct arpcom *)ifp; */ 235 236 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 237 (IFF_UP|IFF_RUNNING)) 238 senderr(ENETDOWN); 239 } 240 #endif /* NCARP > 0 */ 241 242 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 243 senderr(ENETDOWN); 244 if ((rt = rt0) != NULL) { 245 if ((rt->rt_flags & RTF_UP) == 0) { 246 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 247 rt->rt_refcnt--; 248 if (rt->rt_ifp != ifp) 249 return (*rt->rt_ifp->if_output) 250 (ifp, m0, dst, rt); 251 } else 252 senderr(EHOSTUNREACH); 253 } 254 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 255 if (rt->rt_gwroute == 0) 256 goto lookup; 257 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 258 rtfree(rt); rt = rt0; 259 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 260 if ((rt = rt->rt_gwroute) == 0) 261 senderr(EHOSTUNREACH); 262 /* the "G" test below also prevents rt == rt0 */ 263 if ((rt->rt_flags & RTF_GATEWAY) || 264 (rt->rt_ifp != ifp)) { 265 rt->rt_refcnt--; 266 rt0->rt_gwroute = 0; 267 senderr(EHOSTUNREACH); 268 } 269 } 270 } 271 if (rt->rt_flags & RTF_REJECT) 272 if (rt->rt_rmx.rmx_expire == 0 || 273 (u_long) time_second < rt->rt_rmx.rmx_expire) 274 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 275 } 276 277 switch (dst->sa_family) { 278 279 #ifdef INET 280 case AF_INET: 281 if (m->m_flags & M_BCAST) 282 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 283 else if (m->m_flags & M_MCAST) 284 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 285 else if (!arpresolve(ifp, rt, m, dst, edst)) 286 return (0); /* if not yet resolved */ 287 /* If broadcasting on a simplex interface, loopback a copy */ 288 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 289 mcopy = m_copy(m, 0, (int)M_COPYALL); 290 etype = htons(ETHERTYPE_IP); 291 break; 292 293 case AF_ARP: 294 ah = mtod(m, struct arphdr *); 295 if (m->m_flags & M_BCAST) 296 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 297 else { 298 void *tha = ar_tha(ah); 299 300 KASSERT(tha); 301 memcpy(edst, tha, sizeof(edst)); 302 } 303 304 ah->ar_hrd = htons(ARPHRD_ETHER); 305 306 switch (ntohs(ah->ar_op)) { 307 case ARPOP_REVREQUEST: 308 case ARPOP_REVREPLY: 309 etype = htons(ETHERTYPE_REVARP); 310 break; 311 312 case ARPOP_REQUEST: 313 case ARPOP_REPLY: 314 default: 315 etype = htons(ETHERTYPE_ARP); 316 } 317 318 break; 319 #endif 320 #ifdef INET6 321 case AF_INET6: 322 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst, sizeof(edst))){ 323 /* something bad happened */ 324 return (0); 325 } 326 etype = htons(ETHERTYPE_IPV6); 327 break; 328 #endif 329 #ifdef NETATALK 330 case AF_APPLETALK: 331 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 332 #ifdef NETATALKDEBUG 333 printf("aarpresolv failed\n"); 334 #endif /* NETATALKDEBUG */ 335 return (0); 336 } 337 /* 338 * ifaddr is the first thing in at_ifaddr 339 */ 340 aa = (struct at_ifaddr *) at_ifawithnet( 341 (const struct sockaddr_at *)dst, ifp); 342 if (aa == NULL) 343 goto bad; 344 345 /* 346 * In the phase 2 case, we need to prepend an mbuf for the 347 * llc header. Since we must preserve the value of m, 348 * which is passed to us by value, we m_copy() the first 349 * mbuf, and use it for our llc header. 350 */ 351 if (aa->aa_flags & AFA_PHASE2) { 352 struct llc llc; 353 354 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 355 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 356 llc.llc_control = LLC_UI; 357 memcpy(llc.llc_snap_org_code, at_org_code, 358 sizeof(llc.llc_snap_org_code)); 359 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 360 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 361 } else { 362 etype = htons(ETHERTYPE_ATALK); 363 } 364 break; 365 #endif /* NETATALK */ 366 #ifdef IPX 367 case AF_IPX: 368 etype = htons(ETHERTYPE_IPX); 369 memcpy(edst, 370 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 371 sizeof(edst)); 372 /* If broadcasting on a simplex interface, loopback a copy */ 373 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 374 mcopy = m_copy(m, 0, (int)M_COPYALL); 375 break; 376 #endif 377 #ifdef ISO 378 case AF_ISO: { 379 int snpalen; 380 struct llc *l; 381 struct sockaddr_dl *sdl; 382 383 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 384 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 385 memcpy(edst, LLADDR(sdl), sizeof(edst)); 386 } else { 387 error = iso_snparesolve(ifp, 388 (const struct sockaddr_iso *)dst, 389 (char *)edst, &snpalen); 390 if (error) 391 goto bad; /* Not Resolved */ 392 } 393 /* If broadcasting on a simplex interface, loopback a copy */ 394 if (*edst & 1) 395 m->m_flags |= (M_BCAST|M_MCAST); 396 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 397 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 398 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 399 if (mcopy) { 400 eh = mtod(mcopy, struct ether_header *); 401 memcpy(eh->ether_dhost, edst, sizeof(edst)); 402 memcpy(eh->ether_shost, LLADDR(ifp->if_sadl), 403 sizeof(edst)); 404 } 405 } 406 M_PREPEND(m, 3, M_DONTWAIT); 407 if (m == NULL) 408 return (0); 409 l = mtod(m, struct llc *); 410 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 411 l->llc_control = LLC_UI; 412 #ifdef ARGO_DEBUG 413 if (argo_debug[D_ETHER]) { 414 int i; 415 printf("unoutput: sending pkt to: "); 416 for (i=0; i<6; i++) 417 printf("%x ", edst[i] & 0xff); 418 printf("\n"); 419 } 420 #endif 421 } break; 422 #endif /* ISO */ 423 424 case pseudo_AF_HDRCMPLT: 425 hdrcmplt = 1; 426 memcpy(esrc, 427 ((const struct ether_header *)dst->sa_data)->ether_shost, 428 sizeof(esrc)); 429 /* FALLTHROUGH */ 430 431 case AF_UNSPEC: 432 memcpy(edst, 433 ((const struct ether_header *)dst->sa_data)->ether_dhost, 434 sizeof(edst)); 435 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 436 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 437 break; 438 439 default: 440 printf("%s: can't handle af%d\n", ifp->if_xname, 441 dst->sa_family); 442 senderr(EAFNOSUPPORT); 443 } 444 445 if (mcopy) 446 (void)looutput(ifp, mcopy, dst, rt); 447 448 /* If no ether type is set, this must be a 802.2 formatted packet. 449 */ 450 if (etype == 0) 451 etype = htons(m->m_pkthdr.len); 452 /* 453 * Add local net header. If no space in first mbuf, 454 * allocate another. 455 */ 456 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 457 if (m == 0) 458 senderr(ENOBUFS); 459 eh = mtod(m, struct ether_header *); 460 /* Note: etype is already in network byte order. */ 461 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 462 memcpy(eh->ether_dhost, edst, sizeof(edst)); 463 if (hdrcmplt) 464 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 465 else 466 memcpy(eh->ether_shost, LLADDR(ifp->if_sadl), 467 sizeof(eh->ether_shost)); 468 469 #if NCARP > 0 470 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 471 memcpy(eh->ether_shost, LLADDR(ifp0->if_sadl), 472 sizeof(eh->ether_shost)); 473 } 474 #endif /* NCARP > 0 */ 475 476 #ifdef PFIL_HOOKS 477 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 478 return (error); 479 if (m == NULL) 480 return (0); 481 #endif 482 483 #if NBRIDGE > 0 484 /* 485 * Bridges require special output handling. 486 */ 487 if (ifp->if_bridge) 488 return (bridge_output(ifp, m, NULL, NULL)); 489 #endif 490 491 #if NCARP > 0 492 if (ifp != ifp0) 493 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 494 #endif /* NCARP > 0 */ 495 496 #ifdef ALTQ 497 /* 498 * If ALTQ is enabled on the parent interface, do 499 * classification; the queueing discipline might not 500 * require classification, but might require the 501 * address family/header pointer in the pktattr. 502 */ 503 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 504 altq_etherclassify(&ifp->if_snd, m, &pktattr); 505 #endif 506 507 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 508 509 bad: 510 if (m) 511 m_freem(m); 512 return (error); 513 } 514 515 #ifdef ALTQ 516 /* 517 * This routine is a slight hack to allow a packet to be classified 518 * if the Ethernet headers are present. It will go away when ALTQ's 519 * classification engine understands link headers. 520 */ 521 void 522 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 523 struct altq_pktattr *pktattr) 524 { 525 struct ether_header *eh; 526 u_int16_t ether_type; 527 int hlen, af, hdrsize; 528 void *hdr; 529 530 hlen = ETHER_HDR_LEN; 531 eh = mtod(m, struct ether_header *); 532 533 ether_type = htons(eh->ether_type); 534 535 if (ether_type < ETHERMTU) { 536 /* LLC/SNAP */ 537 struct llc *llc = (struct llc *)(eh + 1); 538 hlen += 8; 539 540 if (m->m_len < hlen || 541 llc->llc_dsap != LLC_SNAP_LSAP || 542 llc->llc_ssap != LLC_SNAP_LSAP || 543 llc->llc_control != LLC_UI) { 544 /* Not SNAP. */ 545 goto bad; 546 } 547 548 ether_type = htons(llc->llc_un.type_snap.ether_type); 549 } 550 551 switch (ether_type) { 552 case ETHERTYPE_IP: 553 af = AF_INET; 554 hdrsize = 20; /* sizeof(struct ip) */ 555 break; 556 557 case ETHERTYPE_IPV6: 558 af = AF_INET6; 559 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 560 break; 561 562 default: 563 af = AF_UNSPEC; 564 hdrsize = 0; 565 break; 566 } 567 568 while (m->m_len <= hlen) { 569 hlen -= m->m_len; 570 m = m->m_next; 571 } 572 if (m->m_len < (hlen + hdrsize)) { 573 /* 574 * protocol header not in a single mbuf. 575 * We can't cope with this situation right 576 * now (but it shouldn't ever happen, really, anyhow). 577 */ 578 #ifdef DEBUG 579 printf("altq_etherclassify: headers span multiple mbufs: " 580 "%d < %d\n", m->m_len, (hlen + hdrsize)); 581 #endif 582 goto bad; 583 } 584 585 m->m_data += hlen; 586 m->m_len -= hlen; 587 588 hdr = mtod(m, void *); 589 590 if (ALTQ_NEEDS_CLASSIFY(ifq)) 591 pktattr->pattr_class = 592 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 593 pktattr->pattr_af = af; 594 pktattr->pattr_hdr = hdr; 595 596 m->m_data -= hlen; 597 m->m_len += hlen; 598 599 return; 600 601 bad: 602 pktattr->pattr_class = NULL; 603 pktattr->pattr_hdr = NULL; 604 pktattr->pattr_af = AF_UNSPEC; 605 } 606 #endif /* ALTQ */ 607 608 /* 609 * Process a received Ethernet packet; 610 * the packet is in the mbuf chain m with 611 * the ether header. 612 */ 613 void 614 ether_input(struct ifnet *ifp, struct mbuf *m) 615 { 616 struct ethercom *ec = (struct ethercom *) ifp; 617 struct ifqueue *inq; 618 u_int16_t etype; 619 struct ether_header *eh; 620 #if defined (ISO) || defined (LLC) || defined(NETATALK) 621 struct llc *l; 622 #endif 623 624 if ((ifp->if_flags & IFF_UP) == 0) { 625 m_freem(m); 626 return; 627 } 628 629 #ifdef MBUFTRACE 630 m_claimm(m, &ec->ec_rx_mowner); 631 #endif 632 eh = mtod(m, struct ether_header *); 633 etype = ntohs(eh->ether_type); 634 635 /* 636 * Determine if the packet is within its size limits. 637 */ 638 if (m->m_pkthdr.len > 639 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 640 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 641 bigpktppslim)) { 642 printf("%s: discarding oversize frame (len=%d)\n", 643 ifp->if_xname, m->m_pkthdr.len); 644 } 645 m_freem(m); 646 return; 647 } 648 649 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 650 /* 651 * If this is not a simplex interface, drop the packet 652 * if it came from us. 653 */ 654 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 655 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 656 ETHER_ADDR_LEN) == 0) { 657 m_freem(m); 658 return; 659 } 660 661 if (memcmp(etherbroadcastaddr, 662 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 663 m->m_flags |= M_BCAST; 664 else 665 m->m_flags |= M_MCAST; 666 ifp->if_imcasts++; 667 } 668 669 /* If the CRC is still on the packet, trim it off. */ 670 if (m->m_flags & M_HASFCS) { 671 m_adj(m, -ETHER_CRC_LEN); 672 m->m_flags &= ~M_HASFCS; 673 } 674 675 ifp->if_ibytes += m->m_pkthdr.len; 676 677 #if NBRIDGE > 0 678 /* 679 * Tap the packet off here for a bridge. bridge_input() 680 * will return NULL if it has consumed the packet, otherwise 681 * it gets processed as normal. Note that bridge_input() 682 * will always return the original packet if we need to 683 * process it locally. 684 */ 685 if (ifp->if_bridge) { 686 /* clear M_PROMISC, in case the packets comes from a vlan */ 687 m->m_flags &= ~M_PROMISC; 688 m = bridge_input(ifp, m); 689 if (m == NULL) 690 return; 691 692 /* 693 * Bridge has determined that the packet is for us. 694 * Update our interface pointer -- we may have had 695 * to "bridge" the packet locally. 696 */ 697 ifp = m->m_pkthdr.rcvif; 698 } else 699 #endif /* NBRIDGE > 0 */ 700 { 701 702 #if NCARP > 0 703 if (ifp->if_carp && ifp->if_type != IFT_CARP) { 704 /* 705 * clear M_PROMISC, in case the packets comes from a 706 * vlan 707 */ 708 m->m_flags &= ~M_PROMISC; 709 if (carp_input(m, (u_int8_t *)&eh->ether_shost, 710 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0) 711 return; 712 } 713 #endif /* NCARP > 0 */ 714 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 715 (ifp->if_flags & IFF_PROMISC) != 0 && 716 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 717 ETHER_ADDR_LEN) != 0) { 718 m->m_flags |= M_PROMISC; 719 } 720 } 721 722 #ifdef PFIL_HOOKS 723 if ((m->m_flags & M_PROMISC) == 0) { 724 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 725 return; 726 if (m == NULL) 727 return; 728 729 eh = mtod(m, struct ether_header *); 730 etype = ntohs(eh->ether_type); 731 } 732 #endif 733 734 /* 735 * If VLANs are configured on the interface, check to 736 * see if the device performed the decapsulation and 737 * provided us with the tag. 738 */ 739 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 740 #if NVLAN > 0 741 /* 742 * vlan_input() will either recursively call ether_input() 743 * or drop the packet. 744 */ 745 vlan_input(ifp, m); 746 #else 747 m_freem(m); 748 #endif 749 return; 750 } 751 752 #if NAGR > 0 753 if (ifp->if_agrprivate && 754 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 755 m->m_flags &= ~M_PROMISC; 756 agr_input(ifp, m); 757 return; 758 } 759 #endif /* NAGR > 0 */ 760 761 /* 762 * Handle protocols that expect to have the Ethernet header 763 * (and possibly FCS) intact. 764 */ 765 switch (etype) { 766 #if NVLAN > 0 767 case ETHERTYPE_VLAN: 768 /* 769 * vlan_input() will either recursively call ether_input() 770 * or drop the packet. 771 */ 772 if (((struct ethercom *)ifp)->ec_nvlans != 0) 773 vlan_input(ifp, m); 774 else 775 m_freem(m); 776 return; 777 #endif /* NVLAN > 0 */ 778 #if NPPPOE > 0 779 case ETHERTYPE_PPPOEDISC: 780 case ETHERTYPE_PPPOE: 781 if (m->m_flags & M_PROMISC) { 782 m_freem(m); 783 return; 784 } 785 #ifndef PPPOE_SERVER 786 if (m->m_flags & (M_MCAST | M_BCAST)) { 787 m_freem(m); 788 return; 789 } 790 #endif 791 792 if (etype == ETHERTYPE_PPPOEDISC) 793 inq = &ppoediscinq; 794 else 795 inq = &ppoeinq; 796 if (IF_QFULL(inq)) { 797 IF_DROP(inq); 798 m_freem(m); 799 } else 800 IF_ENQUEUE(inq, m); 801 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 802 if (!callout_pending(&pppoe_softintr)) 803 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 804 #else 805 softint_schedule(pppoe_softintr); 806 #endif 807 return; 808 #endif /* NPPPOE > 0 */ 809 case ETHERTYPE_SLOWPROTOCOLS: { 810 uint8_t subtype; 811 812 #if defined(DIAGNOSTIC) 813 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 814 panic("ether_input: too short slow protocol packet"); 815 } 816 #endif 817 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 818 switch (subtype) { 819 #if NAGR > 0 820 case SLOWPROTOCOLS_SUBTYPE_LACP: 821 if (ifp->if_agrprivate) { 822 ieee8023ad_lacp_input(ifp, m); 823 return; 824 } 825 break; 826 827 case SLOWPROTOCOLS_SUBTYPE_MARKER: 828 if (ifp->if_agrprivate) { 829 ieee8023ad_marker_input(ifp, m); 830 return; 831 } 832 break; 833 #endif /* NAGR > 0 */ 834 default: 835 if (subtype == 0 || subtype > 10) { 836 /* illegal value */ 837 m_freem(m); 838 return; 839 } 840 /* unknown subtype */ 841 break; 842 } 843 /* FALLTHROUGH */ 844 } 845 default: 846 if (m->m_flags & M_PROMISC) { 847 m_freem(m); 848 return; 849 } 850 } 851 852 /* If the CRC is still on the packet, trim it off. */ 853 if (m->m_flags & M_HASFCS) { 854 m_adj(m, -ETHER_CRC_LEN); 855 m->m_flags &= ~M_HASFCS; 856 } 857 858 if (etype > ETHERMTU + sizeof (struct ether_header)) { 859 /* Strip off the Ethernet header. */ 860 m_adj(m, sizeof(struct ether_header)); 861 862 switch (etype) { 863 #ifdef INET 864 case ETHERTYPE_IP: 865 #ifdef GATEWAY 866 if (ipflow_fastforward(m)) 867 return; 868 #endif 869 schednetisr(NETISR_IP); 870 inq = &ipintrq; 871 break; 872 873 case ETHERTYPE_ARP: 874 schednetisr(NETISR_ARP); 875 inq = &arpintrq; 876 break; 877 878 case ETHERTYPE_REVARP: 879 revarpinput(m); /* XXX queue? */ 880 return; 881 #endif 882 #ifdef INET6 883 case ETHERTYPE_IPV6: 884 #ifdef GATEWAY 885 if (ip6flow_fastforward(m)) 886 return; 887 #endif 888 schednetisr(NETISR_IPV6); 889 inq = &ip6intrq; 890 break; 891 #endif 892 #ifdef IPX 893 case ETHERTYPE_IPX: 894 schednetisr(NETISR_IPX); 895 inq = &ipxintrq; 896 break; 897 #endif 898 #ifdef NETATALK 899 case ETHERTYPE_ATALK: 900 schednetisr(NETISR_ATALK); 901 inq = &atintrq1; 902 break; 903 case ETHERTYPE_AARP: 904 /* probably this should be done with a NETISR as well */ 905 aarpinput(ifp, m); /* XXX */ 906 return; 907 #endif /* NETATALK */ 908 default: 909 m_freem(m); 910 return; 911 } 912 } else { 913 #if defined (ISO) || defined (LLC) || defined (NETATALK) 914 l = (struct llc *)(eh+1); 915 switch (l->llc_dsap) { 916 #ifdef NETATALK 917 case LLC_SNAP_LSAP: 918 switch (l->llc_control) { 919 case LLC_UI: 920 if (l->llc_ssap != LLC_SNAP_LSAP) { 921 goto dropanyway; 922 } 923 924 if (Bcmp(&(l->llc_snap_org_code)[0], 925 at_org_code, sizeof(at_org_code)) == 0 && 926 ntohs(l->llc_snap_ether_type) == 927 ETHERTYPE_ATALK) { 928 inq = &atintrq2; 929 m_adj(m, sizeof(struct ether_header) 930 + sizeof(struct llc)); 931 schednetisr(NETISR_ATALK); 932 break; 933 } 934 935 if (Bcmp(&(l->llc_snap_org_code)[0], 936 aarp_org_code, 937 sizeof(aarp_org_code)) == 0 && 938 ntohs(l->llc_snap_ether_type) == 939 ETHERTYPE_AARP) { 940 m_adj( m, sizeof(struct ether_header) 941 + sizeof(struct llc)); 942 aarpinput(ifp, m); /* XXX */ 943 return; 944 } 945 946 default: 947 goto dropanyway; 948 } 949 break; 950 #endif /* NETATALK */ 951 #ifdef ISO 952 case LLC_ISO_LSAP: 953 switch (l->llc_control) { 954 case LLC_UI: 955 /* LLC_UI_P forbidden in class 1 service */ 956 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 957 (l->llc_ssap == LLC_ISO_LSAP)) { 958 /* LSAP for ISO */ 959 /* XXX length computation?? */ 960 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 961 m_adj(m, etype - m->m_pkthdr.len); 962 963 #ifdef ARGO_DEBUG 964 if (argo_debug[D_ETHER]) 965 printf("clnp packet"); 966 #endif 967 schednetisr(NETISR_ISO); 968 inq = &clnlintrq; 969 break; 970 } 971 goto dropanyway; 972 973 case LLC_XID: 974 case LLC_XID_P: 975 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 976 /* XXX m_pullup? */ 977 goto dropanyway; 978 l->llc_window = 0; 979 l->llc_fid = LLC_XID_FORMAT_BASIC; 980 l->llc_class = LLC_XID_CLASS_I; 981 l->llc_dsap = l->llc_ssap = 0; 982 /* Fall through to */ 983 case LLC_TEST: 984 case LLC_TEST_P: 985 { 986 struct sockaddr sa; 987 struct ether_header *eh2; 988 int i; 989 u_char c = l->llc_dsap; 990 991 l->llc_dsap = l->llc_ssap; 992 l->llc_ssap = c; 993 m_adj(m, sizeof(struct ether_header)); 994 /* XXX we can optimize here? */ 995 if (m->m_flags & (M_BCAST | M_MCAST)) 996 memcpy(eh->ether_dhost, 997 LLADDR(ifp->if_sadl), 998 ETHER_ADDR_LEN); 999 sa.sa_family = AF_UNSPEC; 1000 sa.sa_len = sizeof(sa); 1001 eh2 = (struct ether_header *)sa.sa_data; 1002 for (i = 0; i < 6; i++) { 1003 eh2->ether_shost[i] = c = 1004 eh->ether_dhost[i]; 1005 eh2->ether_dhost[i] = 1006 eh->ether_dhost[i] = 1007 eh->ether_shost[i]; 1008 eh->ether_shost[i] = c; 1009 } 1010 ifp->if_output(ifp, m, &sa, NULL); 1011 return; 1012 } 1013 default: 1014 m_freem(m); 1015 return; 1016 } 1017 break; 1018 #endif /* ISO */ 1019 #if defined (ISO) || defined (NETATALK) 1020 dropanyway: 1021 #endif 1022 default: 1023 m_freem(m); 1024 return; 1025 } 1026 #else /* ISO || LLC || NETATALK*/ 1027 m_freem(m); 1028 return; 1029 #endif /* ISO || LLC || NETATALK*/ 1030 } 1031 1032 if (IF_QFULL(inq)) { 1033 IF_DROP(inq); 1034 m_freem(m); 1035 } else 1036 IF_ENQUEUE(inq, m); 1037 } 1038 1039 /* 1040 * Convert Ethernet address to printable (loggable) representation. 1041 */ 1042 char * 1043 ether_sprintf(const u_char *ap) 1044 { 1045 static char etherbuf[3 * ETHER_ADDR_LEN]; 1046 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1047 return etherbuf; 1048 } 1049 1050 char * 1051 ether_snprintf(char *buf, size_t len, const u_char *ap) 1052 { 1053 char *cp = buf; 1054 size_t i; 1055 1056 for (i = 0; i < len / 3; i++) { 1057 *cp++ = hexdigits[*ap >> 4]; 1058 *cp++ = hexdigits[*ap++ & 0xf]; 1059 *cp++ = ':'; 1060 } 1061 *--cp = '\0'; 1062 return buf; 1063 } 1064 1065 /* 1066 * Perform common duties while attaching to interface list 1067 */ 1068 void 1069 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1070 { 1071 struct ethercom *ec = (struct ethercom *)ifp; 1072 1073 ifp->if_type = IFT_ETHER; 1074 ifp->if_addrlen = ETHER_ADDR_LEN; 1075 ifp->if_hdrlen = ETHER_HDR_LEN; 1076 ifp->if_dlt = DLT_EN10MB; 1077 ifp->if_mtu = ETHERMTU; 1078 ifp->if_output = ether_output; 1079 ifp->if_input = ether_input; 1080 if (ifp->if_baudrate == 0) 1081 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1082 1083 if_alloc_sadl(ifp); 1084 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1085 1086 LIST_INIT(&ec->ec_multiaddrs); 1087 ifp->if_broadcastaddr = etherbroadcastaddr; 1088 #if NBPFILTER > 0 1089 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1090 #endif 1091 #ifdef MBUFTRACE 1092 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1093 sizeof(ec->ec_tx_mowner.mo_name)); 1094 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1095 sizeof(ec->ec_tx_mowner.mo_descr)); 1096 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1097 sizeof(ec->ec_rx_mowner.mo_name)); 1098 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1099 sizeof(ec->ec_rx_mowner.mo_descr)); 1100 MOWNER_ATTACH(&ec->ec_tx_mowner); 1101 MOWNER_ATTACH(&ec->ec_rx_mowner); 1102 ifp->if_mowner = &ec->ec_tx_mowner; 1103 #endif 1104 } 1105 1106 void 1107 ether_ifdetach(struct ifnet *ifp) 1108 { 1109 struct ethercom *ec = (void *) ifp; 1110 struct ether_multi *enm; 1111 int s; 1112 1113 #if NBRIDGE > 0 1114 if (ifp->if_bridge) 1115 bridge_ifdetach(ifp); 1116 #endif 1117 1118 #if NBPFILTER > 0 1119 bpfdetach(ifp); 1120 #endif 1121 1122 #if NVLAN > 0 1123 if (ec->ec_nvlans) 1124 vlan_ifdetach(ifp); 1125 #endif 1126 1127 s = splnet(); 1128 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1129 LIST_REMOVE(enm, enm_list); 1130 free(enm, M_IFMADDR); 1131 ec->ec_multicnt--; 1132 } 1133 splx(s); 1134 1135 #if 0 /* done in if_detach() */ 1136 if_free_sadl(ifp); 1137 #endif 1138 1139 MOWNER_DETACH(&ec->ec_rx_mowner); 1140 MOWNER_DETACH(&ec->ec_tx_mowner); 1141 } 1142 1143 #if 0 1144 /* 1145 * This is for reference. We have a table-driven version 1146 * of the little-endian crc32 generator, which is faster 1147 * than the double-loop. 1148 */ 1149 u_int32_t 1150 ether_crc32_le(const u_int8_t *buf, size_t len) 1151 { 1152 u_int32_t c, crc, carry; 1153 size_t i, j; 1154 1155 crc = 0xffffffffU; /* initial value */ 1156 1157 for (i = 0; i < len; i++) { 1158 c = buf[i]; 1159 for (j = 0; j < 8; j++) { 1160 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1161 crc >>= 1; 1162 c >>= 1; 1163 if (carry) 1164 crc = (crc ^ ETHER_CRC_POLY_LE); 1165 } 1166 } 1167 1168 return (crc); 1169 } 1170 #else 1171 u_int32_t 1172 ether_crc32_le(const u_int8_t *buf, size_t len) 1173 { 1174 static const u_int32_t crctab[] = { 1175 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1176 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1177 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1178 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1179 }; 1180 u_int32_t crc; 1181 size_t i; 1182 1183 crc = 0xffffffffU; /* initial value */ 1184 1185 for (i = 0; i < len; i++) { 1186 crc ^= buf[i]; 1187 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1188 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1189 } 1190 1191 return (crc); 1192 } 1193 #endif 1194 1195 u_int32_t 1196 ether_crc32_be(const u_int8_t *buf, size_t len) 1197 { 1198 u_int32_t c, crc, carry; 1199 size_t i, j; 1200 1201 crc = 0xffffffffU; /* initial value */ 1202 1203 for (i = 0; i < len; i++) { 1204 c = buf[i]; 1205 for (j = 0; j < 8; j++) { 1206 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1207 crc <<= 1; 1208 c >>= 1; 1209 if (carry) 1210 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1211 } 1212 } 1213 1214 return (crc); 1215 } 1216 1217 #ifdef INET 1218 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1219 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1220 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1221 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1222 #endif 1223 #ifdef INET6 1224 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1225 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1226 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1227 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1228 #endif 1229 1230 /* 1231 * ether_aton implementation, not using a static buffer. 1232 */ 1233 int 1234 ether_nonstatic_aton(u_char *dest, char *str) 1235 { 1236 int i; 1237 char *cp = str; 1238 u_char val[6]; 1239 1240 #define set_value \ 1241 if (*cp > '9' && *cp < 'a') \ 1242 *cp -= 'A' - 10; \ 1243 else if (*cp > '9') \ 1244 *cp -= 'a' - 10; \ 1245 else \ 1246 *cp -= '0' 1247 1248 for (i = 0; i < 6; i++, cp++) { 1249 if (!isxdigit(*cp)) 1250 return (1); 1251 set_value; 1252 val[i] = *cp++; 1253 if (isxdigit(*cp)) { 1254 set_value; 1255 val[i] *= 16; 1256 val[i] += *cp++; 1257 } 1258 if (*cp == ':' || i == 5) 1259 continue; 1260 else 1261 return 1; 1262 } 1263 memcpy(dest, val, 6); 1264 1265 return 0; 1266 } 1267 1268 1269 /* 1270 * Convert a sockaddr into an Ethernet address or range of Ethernet 1271 * addresses. 1272 */ 1273 int 1274 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1275 u_int8_t addrhi[ETHER_ADDR_LEN]) 1276 { 1277 #ifdef INET 1278 struct sockaddr_in *sin; 1279 #endif /* INET */ 1280 #ifdef INET6 1281 struct sockaddr_in6 *sin6; 1282 #endif /* INET6 */ 1283 1284 switch (sa->sa_family) { 1285 1286 case AF_UNSPEC: 1287 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1288 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1289 break; 1290 1291 #ifdef INET 1292 case AF_INET: 1293 sin = satosin(sa); 1294 if (sin->sin_addr.s_addr == INADDR_ANY) { 1295 /* 1296 * An IP address of INADDR_ANY means listen to 1297 * or stop listening to all of the Ethernet 1298 * multicast addresses used for IP. 1299 * (This is for the sake of IP multicast routers.) 1300 */ 1301 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1302 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1303 } 1304 else { 1305 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1306 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1307 } 1308 break; 1309 #endif 1310 #ifdef INET6 1311 case AF_INET6: 1312 sin6 = satosin6(sa); 1313 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1314 /* 1315 * An IP6 address of 0 means listen to or stop 1316 * listening to all of the Ethernet multicast 1317 * address used for IP6. 1318 * (This is used for multicast routers.) 1319 */ 1320 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1321 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1322 } else { 1323 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1324 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1325 } 1326 break; 1327 #endif 1328 1329 default: 1330 return EAFNOSUPPORT; 1331 } 1332 return 0; 1333 } 1334 1335 /* 1336 * Add an Ethernet multicast address or range of addresses to the list for a 1337 * given interface. 1338 */ 1339 int 1340 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1341 { 1342 struct ether_multi *enm; 1343 u_char addrlo[ETHER_ADDR_LEN]; 1344 u_char addrhi[ETHER_ADDR_LEN]; 1345 int s = splnet(), error; 1346 1347 error = ether_multiaddr(&ifr->ifr_addr, addrlo, 1348 addrhi); 1349 if (error != 0) { 1350 splx(s); 1351 return error; 1352 } 1353 1354 /* 1355 * Verify that we have valid Ethernet multicast addresses. 1356 */ 1357 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1358 splx(s); 1359 return EINVAL; 1360 } 1361 /* 1362 * See if the address range is already in the list. 1363 */ 1364 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1365 if (enm != NULL) { 1366 /* 1367 * Found it; just increment the reference count. 1368 */ 1369 ++enm->enm_refcount; 1370 splx(s); 1371 return 0; 1372 } 1373 /* 1374 * New address or range; malloc a new multicast record 1375 * and link it into the interface's multicast list. 1376 */ 1377 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1378 if (enm == NULL) { 1379 splx(s); 1380 return ENOBUFS; 1381 } 1382 memcpy(enm->enm_addrlo, addrlo, 6); 1383 memcpy(enm->enm_addrhi, addrhi, 6); 1384 enm->enm_refcount = 1; 1385 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1386 ec->ec_multicnt++; 1387 splx(s); 1388 /* 1389 * Return ENETRESET to inform the driver that the list has changed 1390 * and its reception filter should be adjusted accordingly. 1391 */ 1392 return ENETRESET; 1393 } 1394 1395 /* 1396 * Delete a multicast address record. 1397 */ 1398 int 1399 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1400 { 1401 struct ether_multi *enm; 1402 u_char addrlo[ETHER_ADDR_LEN]; 1403 u_char addrhi[ETHER_ADDR_LEN]; 1404 int s = splnet(), error; 1405 1406 error = ether_multiaddr(&ifr->ifr_addr, addrlo, 1407 addrhi); 1408 if (error != 0) { 1409 splx(s); 1410 return (error); 1411 } 1412 1413 /* 1414 * Look ur the address in our list. 1415 */ 1416 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1417 if (enm == NULL) { 1418 splx(s); 1419 return (ENXIO); 1420 } 1421 if (--enm->enm_refcount != 0) { 1422 /* 1423 * Still some claims to this record. 1424 */ 1425 splx(s); 1426 return (0); 1427 } 1428 /* 1429 * No remaining claims to this record; unlink and free it. 1430 */ 1431 LIST_REMOVE(enm, enm_list); 1432 free(enm, M_IFMADDR); 1433 ec->ec_multicnt--; 1434 splx(s); 1435 /* 1436 * Return ENETRESET to inform the driver that the list has changed 1437 * and its reception filter should be adjusted accordingly. 1438 */ 1439 return (ENETRESET); 1440 } 1441 1442 /* 1443 * Common ioctls for Ethernet interfaces. Note, we must be 1444 * called at splnet(). 1445 */ 1446 int 1447 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1448 { 1449 struct ethercom *ec = (void *) ifp; 1450 struct ifreq *ifr = (struct ifreq *)data; 1451 struct ifaddr *ifa = (struct ifaddr *)data; 1452 int error = 0; 1453 1454 switch (cmd) { 1455 case SIOCSIFADDR: 1456 ifp->if_flags |= IFF_UP; 1457 switch (ifa->ifa_addr->sa_family) { 1458 case AF_LINK: 1459 { 1460 struct sockaddr_dl *sdl = 1461 (struct sockaddr_dl *) ifa->ifa_addr; 1462 1463 if (sdl->sdl_type != IFT_ETHER || 1464 sdl->sdl_alen != ifp->if_addrlen) { 1465 error = EINVAL; 1466 break; 1467 } 1468 1469 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1470 ifp->if_addrlen); 1471 1472 /* Set new address. */ 1473 error = (*ifp->if_init)(ifp); 1474 break; 1475 } 1476 #ifdef INET 1477 case AF_INET: 1478 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1479 (error = (*ifp->if_init)(ifp)) != 0) 1480 break; 1481 arp_ifinit(ifp, ifa); 1482 break; 1483 #endif /* INET */ 1484 default: 1485 if ((ifp->if_flags & IFF_RUNNING) == 0) 1486 error = (*ifp->if_init)(ifp); 1487 break; 1488 } 1489 break; 1490 1491 case SIOCGIFADDR: 1492 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1493 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1494 break; 1495 1496 case SIOCSIFMTU: 1497 { 1498 int maxmtu; 1499 1500 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1501 maxmtu = ETHERMTU_JUMBO; 1502 else 1503 maxmtu = ETHERMTU; 1504 1505 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1506 error = EINVAL; 1507 else { 1508 ifp->if_mtu = ifr->ifr_mtu; 1509 1510 /* Make sure the device notices the MTU change. */ 1511 if (ifp->if_flags & IFF_UP) 1512 error = (*ifp->if_init)(ifp); 1513 } 1514 break; 1515 } 1516 1517 case SIOCSIFFLAGS: 1518 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1519 /* 1520 * If interface is marked down and it is running, 1521 * then stop and disable it. 1522 */ 1523 (*ifp->if_stop)(ifp, 1); 1524 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1525 /* 1526 * If interface is marked up and it is stopped, then 1527 * start it. 1528 */ 1529 error = (*ifp->if_init)(ifp); 1530 } else if ((ifp->if_flags & IFF_UP) != 0) { 1531 /* 1532 * Reset the interface to pick up changes in any other 1533 * flags that affect the hardware state. 1534 */ 1535 error = (*ifp->if_init)(ifp); 1536 } 1537 break; 1538 1539 case SIOCADDMULTI: 1540 error = ether_addmulti(ifr, ec); 1541 break; 1542 1543 case SIOCDELMULTI: 1544 error = ether_delmulti(ifr, ec); 1545 break; 1546 1547 default: 1548 error = ENOTTY; 1549 } 1550 1551 return (error); 1552 } 1553
Indexes created Tue Sep 30 10:09:55 GMT 2025