if_ethersubr.c revision 1.154
1 /* $NetBSD: if_ethersubr.c,v 1.154 2007/08/30 02:17:35 dyoung 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 1.154 2007/08/30 02:17:35 dyoung 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 static int ether_output(struct ifnet *, struct mbuf *, 191 const struct sockaddr *, struct rtentry *); 192 193 /* 194 * Ethernet output routine. 195 * Encapsulate a packet of type family for the local net. 196 * Assumes that ifp is actually pointer to ethercom structure. 197 */ 198 static int 199 ether_output(struct ifnet *ifp0, struct mbuf *m0, const struct sockaddr *dst, 200 struct rtentry *rt0) 201 { 202 u_int16_t etype = 0; 203 int error = 0, hdrcmplt = 0; 204 uint8_t esrc[6], edst[6]; 205 struct mbuf *m = m0; 206 struct rtentry *rt; 207 struct mbuf *mcopy = NULL; 208 struct ether_header *eh; 209 struct ifnet *ifp = ifp0; 210 ALTQ_DECL(struct altq_pktattr pktattr;) 211 #ifdef INET 212 struct arphdr *ah; 213 #endif /* INET */ 214 #ifdef NETATALK 215 struct at_ifaddr *aa; 216 #endif /* NETATALK */ 217 218 #ifdef MBUFTRACE 219 m_claimm(m, ifp->if_mowner); 220 #endif 221 222 #if NCARP > 0 223 if (ifp->if_type == IFT_CARP) { 224 struct ifaddr *ifa; 225 226 /* loop back if this is going to the carp interface */ 227 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 228 (ifa = ifa_ifwithaddr(dst)) != NULL && 229 ifa->ifa_ifp == ifp0) 230 return looutput(ifp0, m, dst, rt0); 231 232 ifp = ifp->if_carpdev; 233 /* ac = (struct arpcom *)ifp; */ 234 235 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 236 (IFF_UP|IFF_RUNNING)) 237 senderr(ENETDOWN); 238 } 239 #endif /* NCARP > 0 */ 240 241 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 242 senderr(ENETDOWN); 243 if ((rt = rt0) != NULL) { 244 if ((rt->rt_flags & RTF_UP) == 0) { 245 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 246 rt->rt_refcnt--; 247 if (rt->rt_ifp != ifp) 248 return (*rt->rt_ifp->if_output) 249 (ifp, m0, dst, rt); 250 } else 251 senderr(EHOSTUNREACH); 252 } 253 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 254 if (rt->rt_gwroute == 0) 255 goto lookup; 256 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 257 rtfree(rt); rt = rt0; 258 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 259 if ((rt = rt->rt_gwroute) == 0) 260 senderr(EHOSTUNREACH); 261 /* the "G" test below also prevents rt == rt0 */ 262 if ((rt->rt_flags & RTF_GATEWAY) || 263 (rt->rt_ifp != ifp)) { 264 rt->rt_refcnt--; 265 rt0->rt_gwroute = 0; 266 senderr(EHOSTUNREACH); 267 } 268 } 269 } 270 if (rt->rt_flags & RTF_REJECT) 271 if (rt->rt_rmx.rmx_expire == 0 || 272 (u_long) time_second < rt->rt_rmx.rmx_expire) 273 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 274 } 275 276 switch (dst->sa_family) { 277 278 #ifdef INET 279 case AF_INET: 280 if (m->m_flags & M_BCAST) 281 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 282 else if (m->m_flags & M_MCAST) 283 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 284 else if (!arpresolve(ifp, rt, m, dst, edst)) 285 return (0); /* if not yet resolved */ 286 /* If broadcasting on a simplex interface, loopback a copy */ 287 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 288 mcopy = m_copy(m, 0, (int)M_COPYALL); 289 etype = htons(ETHERTYPE_IP); 290 break; 291 292 case AF_ARP: 293 ah = mtod(m, struct arphdr *); 294 if (m->m_flags & M_BCAST) 295 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 296 else { 297 void *tha = ar_tha(ah); 298 299 KASSERT(tha); 300 memcpy(edst, tha, sizeof(edst)); 301 } 302 303 ah->ar_hrd = htons(ARPHRD_ETHER); 304 305 switch (ntohs(ah->ar_op)) { 306 case ARPOP_REVREQUEST: 307 case ARPOP_REVREPLY: 308 etype = htons(ETHERTYPE_REVARP); 309 break; 310 311 case ARPOP_REQUEST: 312 case ARPOP_REPLY: 313 default: 314 etype = htons(ETHERTYPE_ARP); 315 } 316 317 break; 318 #endif 319 #ifdef INET6 320 case AF_INET6: 321 if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst, sizeof(edst))){ 322 /* something bad happened */ 323 return (0); 324 } 325 etype = htons(ETHERTYPE_IPV6); 326 break; 327 #endif 328 #ifdef NETATALK 329 case AF_APPLETALK: 330 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 331 #ifdef NETATALKDEBUG 332 printf("aarpresolv failed\n"); 333 #endif /* NETATALKDEBUG */ 334 return (0); 335 } 336 /* 337 * ifaddr is the first thing in at_ifaddr 338 */ 339 aa = (struct at_ifaddr *) at_ifawithnet( 340 (const struct sockaddr_at *)dst, ifp); 341 if (aa == NULL) 342 goto bad; 343 344 /* 345 * In the phase 2 case, we need to prepend an mbuf for the 346 * llc header. Since we must preserve the value of m, 347 * which is passed to us by value, we m_copy() the first 348 * mbuf, and use it for our llc header. 349 */ 350 if (aa->aa_flags & AFA_PHASE2) { 351 struct llc llc; 352 353 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 354 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 355 llc.llc_control = LLC_UI; 356 memcpy(llc.llc_snap_org_code, at_org_code, 357 sizeof(llc.llc_snap_org_code)); 358 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 359 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 360 } else { 361 etype = htons(ETHERTYPE_ATALK); 362 } 363 break; 364 #endif /* NETATALK */ 365 #ifdef IPX 366 case AF_IPX: 367 etype = htons(ETHERTYPE_IPX); 368 memcpy(edst, 369 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 370 sizeof(edst)); 371 /* If broadcasting on a simplex interface, loopback a copy */ 372 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 373 mcopy = m_copy(m, 0, (int)M_COPYALL); 374 break; 375 #endif 376 #ifdef ISO 377 case AF_ISO: { 378 int snpalen; 379 struct llc *l; 380 const struct sockaddr_dl *sdl; 381 382 if (rt && (sdl = satocsdl(rt->rt_gateway)) && 383 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 384 memcpy(edst, CLLADDR(sdl), sizeof(edst)); 385 } else { 386 error = iso_snparesolve(ifp, 387 (const struct sockaddr_iso *)dst, 388 (char *)edst, &snpalen); 389 if (error) 390 goto bad; /* Not Resolved */ 391 } 392 /* If broadcasting on a simplex interface, loopback a copy */ 393 if (*edst & 1) 394 m->m_flags |= (M_BCAST|M_MCAST); 395 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 396 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 397 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 398 if (mcopy) { 399 eh = mtod(mcopy, struct ether_header *); 400 memcpy(eh->ether_dhost, edst, sizeof(edst)); 401 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 402 sizeof(edst)); 403 } 404 } 405 M_PREPEND(m, 3, M_DONTWAIT); 406 if (m == NULL) 407 return (0); 408 l = mtod(m, struct llc *); 409 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 410 l->llc_control = LLC_UI; 411 #ifdef ARGO_DEBUG 412 if (argo_debug[D_ETHER]) { 413 int i; 414 printf("unoutput: sending pkt to: "); 415 for (i=0; i<6; i++) 416 printf("%x ", edst[i] & 0xff); 417 printf("\n"); 418 } 419 #endif 420 } break; 421 #endif /* ISO */ 422 423 case pseudo_AF_HDRCMPLT: 424 hdrcmplt = 1; 425 memcpy(esrc, 426 ((const struct ether_header *)dst->sa_data)->ether_shost, 427 sizeof(esrc)); 428 /* FALLTHROUGH */ 429 430 case AF_UNSPEC: 431 memcpy(edst, 432 ((const struct ether_header *)dst->sa_data)->ether_dhost, 433 sizeof(edst)); 434 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 435 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 436 break; 437 438 default: 439 printf("%s: can't handle af%d\n", ifp->if_xname, 440 dst->sa_family); 441 senderr(EAFNOSUPPORT); 442 } 443 444 if (mcopy) 445 (void)looutput(ifp, mcopy, dst, rt); 446 447 /* If no ether type is set, this must be a 802.2 formatted packet. 448 */ 449 if (etype == 0) 450 etype = htons(m->m_pkthdr.len); 451 /* 452 * Add local net header. If no space in first mbuf, 453 * allocate another. 454 */ 455 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 456 if (m == 0) 457 senderr(ENOBUFS); 458 eh = mtod(m, struct ether_header *); 459 /* Note: etype is already in network byte order. */ 460 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 461 memcpy(eh->ether_dhost, edst, sizeof(edst)); 462 if (hdrcmplt) 463 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 464 else 465 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 466 sizeof(eh->ether_shost)); 467 468 #if NCARP > 0 469 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 470 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 471 sizeof(eh->ether_shost)); 472 } 473 #endif /* NCARP > 0 */ 474 475 #ifdef PFIL_HOOKS 476 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 477 return (error); 478 if (m == NULL) 479 return (0); 480 #endif 481 482 #if NBRIDGE > 0 483 /* 484 * Bridges require special output handling. 485 */ 486 if (ifp->if_bridge) 487 return (bridge_output(ifp, m, NULL, NULL)); 488 #endif 489 490 #if NCARP > 0 491 if (ifp != ifp0) 492 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 493 #endif /* NCARP > 0 */ 494 495 #ifdef ALTQ 496 /* 497 * If ALTQ is enabled on the parent interface, do 498 * classification; the queueing discipline might not 499 * require classification, but might require the 500 * address family/header pointer in the pktattr. 501 */ 502 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 503 altq_etherclassify(&ifp->if_snd, m, &pktattr); 504 #endif 505 506 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 507 508 bad: 509 if (m) 510 m_freem(m); 511 return (error); 512 } 513 514 #ifdef ALTQ 515 /* 516 * This routine is a slight hack to allow a packet to be classified 517 * if the Ethernet headers are present. It will go away when ALTQ's 518 * classification engine understands link headers. 519 */ 520 void 521 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 522 struct altq_pktattr *pktattr) 523 { 524 struct ether_header *eh; 525 u_int16_t ether_type; 526 int hlen, af, hdrsize; 527 void *hdr; 528 529 hlen = ETHER_HDR_LEN; 530 eh = mtod(m, struct ether_header *); 531 532 ether_type = htons(eh->ether_type); 533 534 if (ether_type < ETHERMTU) { 535 /* LLC/SNAP */ 536 struct llc *llc = (struct llc *)(eh + 1); 537 hlen += 8; 538 539 if (m->m_len < hlen || 540 llc->llc_dsap != LLC_SNAP_LSAP || 541 llc->llc_ssap != LLC_SNAP_LSAP || 542 llc->llc_control != LLC_UI) { 543 /* Not SNAP. */ 544 goto bad; 545 } 546 547 ether_type = htons(llc->llc_un.type_snap.ether_type); 548 } 549 550 switch (ether_type) { 551 case ETHERTYPE_IP: 552 af = AF_INET; 553 hdrsize = 20; /* sizeof(struct ip) */ 554 break; 555 556 case ETHERTYPE_IPV6: 557 af = AF_INET6; 558 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 559 break; 560 561 default: 562 af = AF_UNSPEC; 563 hdrsize = 0; 564 break; 565 } 566 567 while (m->m_len <= hlen) { 568 hlen -= m->m_len; 569 m = m->m_next; 570 } 571 if (m->m_len < (hlen + hdrsize)) { 572 /* 573 * protocol header not in a single mbuf. 574 * We can't cope with this situation right 575 * now (but it shouldn't ever happen, really, anyhow). 576 */ 577 #ifdef DEBUG 578 printf("altq_etherclassify: headers span multiple mbufs: " 579 "%d < %d\n", m->m_len, (hlen + hdrsize)); 580 #endif 581 goto bad; 582 } 583 584 m->m_data += hlen; 585 m->m_len -= hlen; 586 587 hdr = mtod(m, void *); 588 589 if (ALTQ_NEEDS_CLASSIFY(ifq)) 590 pktattr->pattr_class = 591 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 592 pktattr->pattr_af = af; 593 pktattr->pattr_hdr = hdr; 594 595 m->m_data -= hlen; 596 m->m_len += hlen; 597 598 return; 599 600 bad: 601 pktattr->pattr_class = NULL; 602 pktattr->pattr_hdr = NULL; 603 pktattr->pattr_af = AF_UNSPEC; 604 } 605 #endif /* ALTQ */ 606 607 /* 608 * Process a received Ethernet packet; 609 * the packet is in the mbuf chain m with 610 * the ether header. 611 */ 612 void 613 ether_input(struct ifnet *ifp, struct mbuf *m) 614 { 615 struct ethercom *ec = (struct ethercom *) ifp; 616 struct ifqueue *inq; 617 u_int16_t etype; 618 struct ether_header *eh; 619 #if defined (ISO) || defined (LLC) || defined(NETATALK) 620 struct llc *l; 621 #endif 622 623 if ((ifp->if_flags & IFF_UP) == 0) { 624 m_freem(m); 625 return; 626 } 627 628 #ifdef MBUFTRACE 629 m_claimm(m, &ec->ec_rx_mowner); 630 #endif 631 eh = mtod(m, struct ether_header *); 632 etype = ntohs(eh->ether_type); 633 634 /* 635 * Determine if the packet is within its size limits. 636 */ 637 if (m->m_pkthdr.len > 638 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 639 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 640 bigpktppslim)) { 641 printf("%s: discarding oversize frame (len=%d)\n", 642 ifp->if_xname, m->m_pkthdr.len); 643 } 644 m_freem(m); 645 return; 646 } 647 648 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 649 /* 650 * If this is not a simplex interface, drop the packet 651 * if it came from us. 652 */ 653 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 654 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 655 ETHER_ADDR_LEN) == 0) { 656 m_freem(m); 657 return; 658 } 659 660 if (memcmp(etherbroadcastaddr, 661 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 662 m->m_flags |= M_BCAST; 663 else 664 m->m_flags |= M_MCAST; 665 ifp->if_imcasts++; 666 } 667 668 /* If the CRC is still on the packet, trim it off. */ 669 if (m->m_flags & M_HASFCS) { 670 m_adj(m, -ETHER_CRC_LEN); 671 m->m_flags &= ~M_HASFCS; 672 } 673 674 ifp->if_ibytes += m->m_pkthdr.len; 675 676 #if NBRIDGE > 0 677 /* 678 * Tap the packet off here for a bridge. bridge_input() 679 * will return NULL if it has consumed the packet, otherwise 680 * it gets processed as normal. Note that bridge_input() 681 * will always return the original packet if we need to 682 * process it locally. 683 */ 684 if (ifp->if_bridge) { 685 /* clear M_PROMISC, in case the packets comes from a vlan */ 686 m->m_flags &= ~M_PROMISC; 687 m = bridge_input(ifp, m); 688 if (m == NULL) 689 return; 690 691 /* 692 * Bridge has determined that the packet is for us. 693 * Update our interface pointer -- we may have had 694 * to "bridge" the packet locally. 695 */ 696 ifp = m->m_pkthdr.rcvif; 697 } else 698 #endif /* NBRIDGE > 0 */ 699 { 700 701 #if NCARP > 0 702 if (ifp->if_carp && ifp->if_type != IFT_CARP) { 703 /* 704 * clear M_PROMISC, in case the packets comes from a 705 * vlan 706 */ 707 m->m_flags &= ~M_PROMISC; 708 if (carp_input(m, (u_int8_t *)&eh->ether_shost, 709 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0) 710 return; 711 } 712 #endif /* NCARP > 0 */ 713 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 714 (ifp->if_flags & IFF_PROMISC) != 0 && 715 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 716 ETHER_ADDR_LEN) != 0) { 717 m->m_flags |= M_PROMISC; 718 } 719 } 720 721 #ifdef PFIL_HOOKS 722 if ((m->m_flags & M_PROMISC) == 0) { 723 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 724 return; 725 if (m == NULL) 726 return; 727 728 eh = mtod(m, struct ether_header *); 729 etype = ntohs(eh->ether_type); 730 } 731 #endif 732 733 /* 734 * If VLANs are configured on the interface, check to 735 * see if the device performed the decapsulation and 736 * provided us with the tag. 737 */ 738 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 739 #if NVLAN > 0 740 /* 741 * vlan_input() will either recursively call ether_input() 742 * or drop the packet. 743 */ 744 vlan_input(ifp, m); 745 #else 746 m_freem(m); 747 #endif 748 return; 749 } 750 751 #if NAGR > 0 752 if (ifp->if_agrprivate && 753 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 754 m->m_flags &= ~M_PROMISC; 755 agr_input(ifp, m); 756 return; 757 } 758 #endif /* NAGR > 0 */ 759 760 /* 761 * Handle protocols that expect to have the Ethernet header 762 * (and possibly FCS) intact. 763 */ 764 switch (etype) { 765 #if NVLAN > 0 766 case ETHERTYPE_VLAN: 767 /* 768 * vlan_input() will either recursively call ether_input() 769 * or drop the packet. 770 */ 771 if (((struct ethercom *)ifp)->ec_nvlans != 0) 772 vlan_input(ifp, m); 773 else 774 m_freem(m); 775 return; 776 #endif /* NVLAN > 0 */ 777 #if NPPPOE > 0 778 case ETHERTYPE_PPPOEDISC: 779 case ETHERTYPE_PPPOE: 780 if (m->m_flags & M_PROMISC) { 781 m_freem(m); 782 return; 783 } 784 #ifndef PPPOE_SERVER 785 if (m->m_flags & (M_MCAST | M_BCAST)) { 786 m_freem(m); 787 return; 788 } 789 #endif 790 791 if (etype == ETHERTYPE_PPPOEDISC) 792 inq = &ppoediscinq; 793 else 794 inq = &ppoeinq; 795 if (IF_QFULL(inq)) { 796 IF_DROP(inq); 797 m_freem(m); 798 } else 799 IF_ENQUEUE(inq, m); 800 softintr_schedule(pppoe_softintr); 801 return; 802 #endif /* NPPPOE > 0 */ 803 case ETHERTYPE_SLOWPROTOCOLS: { 804 uint8_t subtype; 805 806 #if defined(DIAGNOSTIC) 807 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 808 panic("ether_input: too short slow protocol packet"); 809 } 810 #endif 811 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 812 switch (subtype) { 813 #if NAGR > 0 814 case SLOWPROTOCOLS_SUBTYPE_LACP: 815 if (ifp->if_agrprivate) { 816 ieee8023ad_lacp_input(ifp, m); 817 return; 818 } 819 break; 820 821 case SLOWPROTOCOLS_SUBTYPE_MARKER: 822 if (ifp->if_agrprivate) { 823 ieee8023ad_marker_input(ifp, m); 824 return; 825 } 826 break; 827 #endif /* NAGR > 0 */ 828 default: 829 if (subtype == 0 || subtype > 10) { 830 /* illegal value */ 831 m_freem(m); 832 return; 833 } 834 /* unknown subtype */ 835 break; 836 } 837 /* FALLTHROUGH */ 838 } 839 default: 840 if (m->m_flags & M_PROMISC) { 841 m_freem(m); 842 return; 843 } 844 } 845 846 /* If the CRC is still on the packet, trim it off. */ 847 if (m->m_flags & M_HASFCS) { 848 m_adj(m, -ETHER_CRC_LEN); 849 m->m_flags &= ~M_HASFCS; 850 } 851 852 if (etype > ETHERMTU + sizeof (struct ether_header)) { 853 /* Strip off the Ethernet header. */ 854 m_adj(m, sizeof(struct ether_header)); 855 856 switch (etype) { 857 #ifdef INET 858 case ETHERTYPE_IP: 859 #ifdef GATEWAY 860 if (ipflow_fastforward(m)) 861 return; 862 #endif 863 schednetisr(NETISR_IP); 864 inq = &ipintrq; 865 break; 866 867 case ETHERTYPE_ARP: 868 schednetisr(NETISR_ARP); 869 inq = &arpintrq; 870 break; 871 872 case ETHERTYPE_REVARP: 873 revarpinput(m); /* XXX queue? */ 874 return; 875 #endif 876 #ifdef INET6 877 case ETHERTYPE_IPV6: 878 #ifdef GATEWAY 879 if (ip6flow_fastforward(m)) 880 return; 881 #endif 882 schednetisr(NETISR_IPV6); 883 inq = &ip6intrq; 884 break; 885 #endif 886 #ifdef IPX 887 case ETHERTYPE_IPX: 888 schednetisr(NETISR_IPX); 889 inq = &ipxintrq; 890 break; 891 #endif 892 #ifdef NETATALK 893 case ETHERTYPE_ATALK: 894 schednetisr(NETISR_ATALK); 895 inq = &atintrq1; 896 break; 897 case ETHERTYPE_AARP: 898 /* probably this should be done with a NETISR as well */ 899 aarpinput(ifp, m); /* XXX */ 900 return; 901 #endif /* NETATALK */ 902 default: 903 m_freem(m); 904 return; 905 } 906 } else { 907 #if defined (ISO) || defined (LLC) || defined (NETATALK) 908 l = (struct llc *)(eh+1); 909 switch (l->llc_dsap) { 910 #ifdef NETATALK 911 case LLC_SNAP_LSAP: 912 switch (l->llc_control) { 913 case LLC_UI: 914 if (l->llc_ssap != LLC_SNAP_LSAP) { 915 goto dropanyway; 916 } 917 918 if (Bcmp(&(l->llc_snap_org_code)[0], 919 at_org_code, sizeof(at_org_code)) == 0 && 920 ntohs(l->llc_snap_ether_type) == 921 ETHERTYPE_ATALK) { 922 inq = &atintrq2; 923 m_adj(m, sizeof(struct ether_header) 924 + sizeof(struct llc)); 925 schednetisr(NETISR_ATALK); 926 break; 927 } 928 929 if (Bcmp(&(l->llc_snap_org_code)[0], 930 aarp_org_code, 931 sizeof(aarp_org_code)) == 0 && 932 ntohs(l->llc_snap_ether_type) == 933 ETHERTYPE_AARP) { 934 m_adj( m, sizeof(struct ether_header) 935 + sizeof(struct llc)); 936 aarpinput(ifp, m); /* XXX */ 937 return; 938 } 939 940 default: 941 goto dropanyway; 942 } 943 break; 944 #endif /* NETATALK */ 945 #ifdef ISO 946 case LLC_ISO_LSAP: 947 switch (l->llc_control) { 948 case LLC_UI: 949 /* LLC_UI_P forbidden in class 1 service */ 950 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 951 (l->llc_ssap == LLC_ISO_LSAP)) { 952 /* LSAP for ISO */ 953 /* XXX length computation?? */ 954 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 955 m_adj(m, etype - m->m_pkthdr.len); 956 957 #ifdef ARGO_DEBUG 958 if (argo_debug[D_ETHER]) 959 printf("clnp packet"); 960 #endif 961 schednetisr(NETISR_ISO); 962 inq = &clnlintrq; 963 break; 964 } 965 goto dropanyway; 966 967 case LLC_XID: 968 case LLC_XID_P: 969 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 970 /* XXX m_pullup? */ 971 goto dropanyway; 972 l->llc_window = 0; 973 l->llc_fid = LLC_XID_FORMAT_BASIC; 974 l->llc_class = LLC_XID_CLASS_I; 975 l->llc_dsap = l->llc_ssap = 0; 976 /* Fall through to */ 977 case LLC_TEST: 978 case LLC_TEST_P: 979 { 980 struct sockaddr sa; 981 struct ether_header *eh2; 982 int i; 983 u_char c = l->llc_dsap; 984 985 l->llc_dsap = l->llc_ssap; 986 l->llc_ssap = c; 987 m_adj(m, sizeof(struct ether_header)); 988 /* XXX we can optimize here? */ 989 if (m->m_flags & (M_BCAST | M_MCAST)) 990 memcpy(eh->ether_dhost, 991 CLLADDR(ifp->if_sadl), 992 ETHER_ADDR_LEN); 993 sa.sa_family = AF_UNSPEC; 994 sa.sa_len = sizeof(sa); 995 eh2 = (struct ether_header *)sa.sa_data; 996 for (i = 0; i < 6; i++) { 997 eh2->ether_shost[i] = c = 998 eh->ether_dhost[i]; 999 eh2->ether_dhost[i] = 1000 eh->ether_dhost[i] = 1001 eh->ether_shost[i]; 1002 eh->ether_shost[i] = c; 1003 } 1004 ifp->if_output(ifp, m, &sa, NULL); 1005 return; 1006 } 1007 default: 1008 m_freem(m); 1009 return; 1010 } 1011 break; 1012 #endif /* ISO */ 1013 #if defined (ISO) || defined (NETATALK) 1014 dropanyway: 1015 #endif 1016 default: 1017 m_freem(m); 1018 return; 1019 } 1020 #else /* ISO || LLC || NETATALK*/ 1021 m_freem(m); 1022 return; 1023 #endif /* ISO || LLC || NETATALK*/ 1024 } 1025 1026 if (IF_QFULL(inq)) { 1027 IF_DROP(inq); 1028 m_freem(m); 1029 } else 1030 IF_ENQUEUE(inq, m); 1031 } 1032 1033 /* 1034 * Convert Ethernet address to printable (loggable) representation. 1035 */ 1036 char * 1037 ether_sprintf(const u_char *ap) 1038 { 1039 static char etherbuf[3 * ETHER_ADDR_LEN]; 1040 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1041 return etherbuf; 1042 } 1043 1044 char * 1045 ether_snprintf(char *buf, size_t len, const u_char *ap) 1046 { 1047 char *cp = buf; 1048 size_t i; 1049 1050 for (i = 0; i < len / 3; i++) { 1051 *cp++ = hexdigits[*ap >> 4]; 1052 *cp++ = hexdigits[*ap++ & 0xf]; 1053 *cp++ = ':'; 1054 } 1055 *--cp = '\0'; 1056 return buf; 1057 } 1058 1059 /* 1060 * Perform common duties while attaching to interface list 1061 */ 1062 void 1063 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1064 { 1065 struct ethercom *ec = (struct ethercom *)ifp; 1066 1067 ifp->if_type = IFT_ETHER; 1068 ifp->if_addrlen = ETHER_ADDR_LEN; 1069 ifp->if_hdrlen = ETHER_HDR_LEN; 1070 ifp->if_dlt = DLT_EN10MB; 1071 ifp->if_mtu = ETHERMTU; 1072 ifp->if_output = ether_output; 1073 ifp->if_input = ether_input; 1074 if (ifp->if_baudrate == 0) 1075 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1076 1077 if_alloc_sadl(ifp); 1078 (void)sockaddr_dl_setaddr(ifp->if_sadl, ifp->if_sadl->sdl_len, 1079 lla, ifp->if_addrlen); 1080 1081 LIST_INIT(&ec->ec_multiaddrs); 1082 ifp->if_broadcastaddr = etherbroadcastaddr; 1083 #if NBPFILTER > 0 1084 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1085 #endif 1086 #ifdef MBUFTRACE 1087 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1088 sizeof(ec->ec_tx_mowner.mo_name)); 1089 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1090 sizeof(ec->ec_tx_mowner.mo_descr)); 1091 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1092 sizeof(ec->ec_rx_mowner.mo_name)); 1093 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1094 sizeof(ec->ec_rx_mowner.mo_descr)); 1095 MOWNER_ATTACH(&ec->ec_tx_mowner); 1096 MOWNER_ATTACH(&ec->ec_rx_mowner); 1097 ifp->if_mowner = &ec->ec_tx_mowner; 1098 #endif 1099 } 1100 1101 void 1102 ether_ifdetach(struct ifnet *ifp) 1103 { 1104 struct ethercom *ec = (void *) ifp; 1105 struct ether_multi *enm; 1106 int s; 1107 1108 #if NBRIDGE > 0 1109 if (ifp->if_bridge) 1110 bridge_ifdetach(ifp); 1111 #endif 1112 1113 #if NBPFILTER > 0 1114 bpfdetach(ifp); 1115 #endif 1116 1117 #if NVLAN > 0 1118 if (ec->ec_nvlans) 1119 vlan_ifdetach(ifp); 1120 #endif 1121 1122 s = splnet(); 1123 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1124 LIST_REMOVE(enm, enm_list); 1125 free(enm, M_IFMADDR); 1126 ec->ec_multicnt--; 1127 } 1128 splx(s); 1129 1130 #if 0 /* done in if_detach() */ 1131 if_free_sadl(ifp); 1132 #endif 1133 1134 MOWNER_DETACH(&ec->ec_rx_mowner); 1135 MOWNER_DETACH(&ec->ec_tx_mowner); 1136 } 1137 1138 #if 0 1139 /* 1140 * This is for reference. We have a table-driven version 1141 * of the little-endian crc32 generator, which is faster 1142 * than the double-loop. 1143 */ 1144 u_int32_t 1145 ether_crc32_le(const u_int8_t *buf, size_t len) 1146 { 1147 u_int32_t c, crc, carry; 1148 size_t i, j; 1149 1150 crc = 0xffffffffU; /* initial value */ 1151 1152 for (i = 0; i < len; i++) { 1153 c = buf[i]; 1154 for (j = 0; j < 8; j++) { 1155 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1156 crc >>= 1; 1157 c >>= 1; 1158 if (carry) 1159 crc = (crc ^ ETHER_CRC_POLY_LE); 1160 } 1161 } 1162 1163 return (crc); 1164 } 1165 #else 1166 u_int32_t 1167 ether_crc32_le(const u_int8_t *buf, size_t len) 1168 { 1169 static const u_int32_t crctab[] = { 1170 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1171 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1172 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1173 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1174 }; 1175 u_int32_t crc; 1176 size_t i; 1177 1178 crc = 0xffffffffU; /* initial value */ 1179 1180 for (i = 0; i < len; i++) { 1181 crc ^= buf[i]; 1182 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1183 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1184 } 1185 1186 return (crc); 1187 } 1188 #endif 1189 1190 u_int32_t 1191 ether_crc32_be(const u_int8_t *buf, size_t len) 1192 { 1193 u_int32_t c, crc, carry; 1194 size_t i, j; 1195 1196 crc = 0xffffffffU; /* initial value */ 1197 1198 for (i = 0; i < len; i++) { 1199 c = buf[i]; 1200 for (j = 0; j < 8; j++) { 1201 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1202 crc <<= 1; 1203 c >>= 1; 1204 if (carry) 1205 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1206 } 1207 } 1208 1209 return (crc); 1210 } 1211 1212 #ifdef INET 1213 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1214 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1215 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1216 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1217 #endif 1218 #ifdef INET6 1219 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1220 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1221 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1222 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1223 #endif 1224 1225 /* 1226 * ether_aton implementation, not using a static buffer. 1227 */ 1228 int 1229 ether_nonstatic_aton(u_char *dest, char *str) 1230 { 1231 int i; 1232 char *cp = str; 1233 u_char val[6]; 1234 1235 #define set_value \ 1236 if (*cp > '9' && *cp < 'a') \ 1237 *cp -= 'A' - 10; \ 1238 else if (*cp > '9') \ 1239 *cp -= 'a' - 10; \ 1240 else \ 1241 *cp -= '0' 1242 1243 for (i = 0; i < 6; i++, cp++) { 1244 if (!isxdigit(*cp)) 1245 return (1); 1246 set_value; 1247 val[i] = *cp++; 1248 if (isxdigit(*cp)) { 1249 set_value; 1250 val[i] *= 16; 1251 val[i] += *cp++; 1252 } 1253 if (*cp == ':' || i == 5) 1254 continue; 1255 else 1256 return 1; 1257 } 1258 memcpy(dest, val, 6); 1259 1260 return 0; 1261 } 1262 1263 1264 /* 1265 * Convert a sockaddr into an Ethernet address or range of Ethernet 1266 * addresses. 1267 */ 1268 int 1269 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1270 u_int8_t addrhi[ETHER_ADDR_LEN]) 1271 { 1272 #ifdef INET 1273 struct sockaddr_in *sin; 1274 #endif /* INET */ 1275 #ifdef INET6 1276 struct sockaddr_in6 *sin6; 1277 #endif /* INET6 */ 1278 1279 switch (sa->sa_family) { 1280 1281 case AF_UNSPEC: 1282 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1283 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1284 break; 1285 1286 #ifdef INET 1287 case AF_INET: 1288 sin = satosin(sa); 1289 if (sin->sin_addr.s_addr == INADDR_ANY) { 1290 /* 1291 * An IP address of INADDR_ANY means listen to 1292 * or stop listening to all of the Ethernet 1293 * multicast addresses used for IP. 1294 * (This is for the sake of IP multicast routers.) 1295 */ 1296 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1297 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1298 } 1299 else { 1300 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1301 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1302 } 1303 break; 1304 #endif 1305 #ifdef INET6 1306 case AF_INET6: 1307 sin6 = satosin6(sa); 1308 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1309 /* 1310 * An IP6 address of 0 means listen to or stop 1311 * listening to all of the Ethernet multicast 1312 * address used for IP6. 1313 * (This is used for multicast routers.) 1314 */ 1315 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1316 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1317 } else { 1318 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1319 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1320 } 1321 break; 1322 #endif 1323 1324 default: 1325 return EAFNOSUPPORT; 1326 } 1327 return 0; 1328 } 1329 1330 /* 1331 * Add an Ethernet multicast address or range of addresses to the list for a 1332 * given interface. 1333 */ 1334 int 1335 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1336 { 1337 struct ether_multi *enm; 1338 u_char addrlo[ETHER_ADDR_LEN]; 1339 u_char addrhi[ETHER_ADDR_LEN]; 1340 int s = splnet(), error; 1341 1342 error = ether_multiaddr(&ifr->ifr_addr, addrlo, 1343 addrhi); 1344 if (error != 0) { 1345 splx(s); 1346 return error; 1347 } 1348 1349 /* 1350 * Verify that we have valid Ethernet multicast addresses. 1351 */ 1352 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1353 splx(s); 1354 return EINVAL; 1355 } 1356 /* 1357 * See if the address range is already in the list. 1358 */ 1359 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1360 if (enm != NULL) { 1361 /* 1362 * Found it; just increment the reference count. 1363 */ 1364 ++enm->enm_refcount; 1365 splx(s); 1366 return 0; 1367 } 1368 /* 1369 * New address or range; malloc a new multicast record 1370 * and link it into the interface's multicast list. 1371 */ 1372 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1373 if (enm == NULL) { 1374 splx(s); 1375 return ENOBUFS; 1376 } 1377 memcpy(enm->enm_addrlo, addrlo, 6); 1378 memcpy(enm->enm_addrhi, addrhi, 6); 1379 enm->enm_refcount = 1; 1380 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1381 ec->ec_multicnt++; 1382 splx(s); 1383 /* 1384 * Return ENETRESET to inform the driver that the list has changed 1385 * and its reception filter should be adjusted accordingly. 1386 */ 1387 return ENETRESET; 1388 } 1389 1390 /* 1391 * Delete a multicast address record. 1392 */ 1393 int 1394 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1395 { 1396 struct ether_multi *enm; 1397 u_char addrlo[ETHER_ADDR_LEN]; 1398 u_char addrhi[ETHER_ADDR_LEN]; 1399 int s = splnet(), error; 1400 1401 error = ether_multiaddr(&ifr->ifr_addr, addrlo, 1402 addrhi); 1403 if (error != 0) { 1404 splx(s); 1405 return (error); 1406 } 1407 1408 /* 1409 * Look ur the address in our list. 1410 */ 1411 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1412 if (enm == NULL) { 1413 splx(s); 1414 return (ENXIO); 1415 } 1416 if (--enm->enm_refcount != 0) { 1417 /* 1418 * Still some claims to this record. 1419 */ 1420 splx(s); 1421 return (0); 1422 } 1423 /* 1424 * No remaining claims to this record; unlink and free it. 1425 */ 1426 LIST_REMOVE(enm, enm_list); 1427 free(enm, M_IFMADDR); 1428 ec->ec_multicnt--; 1429 splx(s); 1430 /* 1431 * Return ENETRESET to inform the driver that the list has changed 1432 * and its reception filter should be adjusted accordingly. 1433 */ 1434 return (ENETRESET); 1435 } 1436 1437 /* 1438 * Common ioctls for Ethernet interfaces. Note, we must be 1439 * called at splnet(). 1440 */ 1441 int 1442 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1443 { 1444 struct ethercom *ec = (void *) ifp; 1445 struct ifreq *ifr = (struct ifreq *)data; 1446 struct ifaddr *ifa = (struct ifaddr *)data; 1447 int error = 0; 1448 1449 switch (cmd) { 1450 case SIOCSIFADDR: 1451 ifp->if_flags |= IFF_UP; 1452 switch (ifa->ifa_addr->sa_family) { 1453 case AF_LINK: 1454 { 1455 const struct sockaddr_dl *sdl = satocsdl(ifa->ifa_addr); 1456 1457 if (sdl->sdl_type != IFT_ETHER || 1458 sdl->sdl_alen != ifp->if_addrlen) { 1459 error = EINVAL; 1460 break; 1461 } 1462 1463 (void)sockaddr_dl_setaddr(ifp->if_sadl, 1464 ifp->if_sadl->sdl_len, CLLADDR(sdl), 1465 ifp->if_addrlen); 1466 1467 /* Set new address. */ 1468 error = (*ifp->if_init)(ifp); 1469 break; 1470 } 1471 #ifdef INET 1472 case AF_INET: 1473 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1474 (error = (*ifp->if_init)(ifp)) != 0) 1475 break; 1476 arp_ifinit(ifp, ifa); 1477 break; 1478 #endif /* INET */ 1479 default: 1480 if ((ifp->if_flags & IFF_RUNNING) == 0) 1481 error = (*ifp->if_init)(ifp); 1482 break; 1483 } 1484 break; 1485 1486 case SIOCGIFADDR: 1487 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1488 CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1489 break; 1490 1491 case SIOCSIFMTU: 1492 { 1493 int maxmtu; 1494 1495 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1496 maxmtu = ETHERMTU_JUMBO; 1497 else 1498 maxmtu = ETHERMTU; 1499 1500 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1501 error = EINVAL; 1502 else { 1503 ifp->if_mtu = ifr->ifr_mtu; 1504 1505 /* Make sure the device notices the MTU change. */ 1506 if (ifp->if_flags & IFF_UP) 1507 error = (*ifp->if_init)(ifp); 1508 } 1509 break; 1510 } 1511 1512 case SIOCSIFFLAGS: 1513 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1514 /* 1515 * If interface is marked down and it is running, 1516 * then stop and disable it. 1517 */ 1518 (*ifp->if_stop)(ifp, 1); 1519 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1520 /* 1521 * If interface is marked up and it is stopped, then 1522 * start it. 1523 */ 1524 error = (*ifp->if_init)(ifp); 1525 } else if ((ifp->if_flags & IFF_UP) != 0) { 1526 /* 1527 * Reset the interface to pick up changes in any other 1528 * flags that affect the hardware state. 1529 */ 1530 error = (*ifp->if_init)(ifp); 1531 } 1532 break; 1533 1534 case SIOCADDMULTI: 1535 error = ether_addmulti(ifr, ec); 1536 break; 1537 1538 case SIOCDELMULTI: 1539 error = ether_delmulti(ifr, ec); 1540 break; 1541 1542 default: 1543 error = ENOTTY; 1544 } 1545 1546 return (error); 1547 } 1548
Indexes created Sun Sep 21 20:09:37 GMT 2025