if_ethersubr.c revision 1.145
1 /* $NetBSD: if_ethersubr.c,v 1.145 2007/02/17 22:34:08 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 1.145 2007/02/17 22:34:08 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 = (struct mbuf *)0; 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 caddr_t tha = ar_tha(ah); 298 299 KASSERT(tha); 300 bcopy(tha, (caddr_t)edst, 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 bcopy(at_org_code, llc.llc_snap_org_code, 357 sizeof(llc.llc_snap_org_code)); 358 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 359 bcopy(&llc, mtod(m, caddr_t), 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 bcopy(&(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 369 (caddr_t)edst, sizeof (edst)); 370 /* If broadcasting on a simplex interface, loopback a copy */ 371 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 372 mcopy = m_copy(m, 0, (int)M_COPYALL); 373 break; 374 #endif 375 #ifdef ISO 376 case AF_ISO: { 377 int snpalen; 378 struct llc *l; 379 struct sockaddr_dl *sdl; 380 381 if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && 382 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 383 bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); 384 } else { 385 error = iso_snparesolve(ifp, 386 (const struct sockaddr_iso *)dst, 387 (char *)edst, &snpalen); 388 if (error) 389 goto bad; /* Not Resolved */ 390 } 391 /* If broadcasting on a simplex interface, loopback a copy */ 392 if (*edst & 1) 393 m->m_flags |= (M_BCAST|M_MCAST); 394 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 395 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 396 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 397 if (mcopy) { 398 eh = mtod(mcopy, struct ether_header *); 399 bcopy(edst, eh->ether_dhost, sizeof(edst)); 400 bcopy(LLADDR(ifp->if_sadl), 401 eh->ether_shost, sizeof(edst)); 402 } 403 } 404 M_PREPEND(m, 3, M_DONTWAIT); 405 if (m == NULL) 406 return (0); 407 l = mtod(m, struct llc *); 408 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 409 l->llc_control = LLC_UI; 410 #ifdef ARGO_DEBUG 411 if (argo_debug[D_ETHER]) { 412 int i; 413 printf("unoutput: sending pkt to: "); 414 for (i=0; i<6; i++) 415 printf("%x ", edst[i] & 0xff); 416 printf("\n"); 417 } 418 #endif 419 } break; 420 #endif /* ISO */ 421 422 case pseudo_AF_HDRCMPLT: 423 hdrcmplt = 1; 424 bcopy(((const struct ether_header *)dst->sa_data)->ether_shost, 425 esrc, sizeof(esrc)); 426 /* FALLTHROUGH */ 427 428 case AF_UNSPEC: 429 bcopy(((const struct ether_header *)dst->sa_data)->ether_dhost, 430 edst, sizeof(edst)); 431 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 432 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 433 break; 434 435 default: 436 printf("%s: can't handle af%d\n", ifp->if_xname, 437 dst->sa_family); 438 senderr(EAFNOSUPPORT); 439 } 440 441 if (mcopy) 442 (void)looutput(ifp, mcopy, dst, rt); 443 444 /* If no ether type is set, this must be a 802.2 formatted packet. 445 */ 446 if (etype == 0) 447 etype = htons(m->m_pkthdr.len); 448 /* 449 * Add local net header. If no space in first mbuf, 450 * allocate another. 451 */ 452 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 453 if (m == 0) 454 senderr(ENOBUFS); 455 eh = mtod(m, struct ether_header *); 456 /* Note: etype is already in network byte order. */ 457 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 458 bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); 459 if (hdrcmplt) 460 bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 461 sizeof(eh->ether_shost)); 462 else 463 bcopy(LLADDR(ifp->if_sadl), (caddr_t)eh->ether_shost, 464 sizeof(eh->ether_shost)); 465 466 #if NCARP > 0 467 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 468 bcopy(LLADDR(ifp0->if_sadl), (caddr_t)eh->ether_shost, 469 sizeof(eh->ether_shost)); 470 } 471 #endif /* NCARP > 0 */ 472 473 #ifdef PFIL_HOOKS 474 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 475 return (error); 476 if (m == NULL) 477 return (0); 478 #endif 479 480 #if NBRIDGE > 0 481 /* 482 * Bridges require special output handling. 483 */ 484 if (ifp->if_bridge) 485 return (bridge_output(ifp, m, NULL, NULL)); 486 #endif 487 488 #if NCARP > 0 489 if (ifp != ifp0) 490 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 491 #endif /* NCARP > 0 */ 492 493 #ifdef ALTQ 494 /* 495 * If ALTQ is enabled on the parent interface, do 496 * classification; the queueing discipline might not 497 * require classification, but might require the 498 * address family/header pointer in the pktattr. 499 */ 500 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 501 altq_etherclassify(&ifp->if_snd, m, &pktattr); 502 #endif 503 504 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 505 506 bad: 507 if (m) 508 m_freem(m); 509 return (error); 510 } 511 512 #ifdef ALTQ 513 /* 514 * This routine is a slight hack to allow a packet to be classified 515 * if the Ethernet headers are present. It will go away when ALTQ's 516 * classification engine understands link headers. 517 */ 518 void 519 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 520 struct altq_pktattr *pktattr) 521 { 522 struct ether_header *eh; 523 u_int16_t ether_type; 524 int hlen, af, hdrsize; 525 caddr_t hdr; 526 527 hlen = ETHER_HDR_LEN; 528 eh = mtod(m, struct ether_header *); 529 530 ether_type = htons(eh->ether_type); 531 532 if (ether_type < ETHERMTU) { 533 /* LLC/SNAP */ 534 struct llc *llc = (struct llc *)(eh + 1); 535 hlen += 8; 536 537 if (m->m_len < hlen || 538 llc->llc_dsap != LLC_SNAP_LSAP || 539 llc->llc_ssap != LLC_SNAP_LSAP || 540 llc->llc_control != LLC_UI) { 541 /* Not SNAP. */ 542 goto bad; 543 } 544 545 ether_type = htons(llc->llc_un.type_snap.ether_type); 546 } 547 548 switch (ether_type) { 549 case ETHERTYPE_IP: 550 af = AF_INET; 551 hdrsize = 20; /* sizeof(struct ip) */ 552 break; 553 554 case ETHERTYPE_IPV6: 555 af = AF_INET6; 556 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 557 break; 558 559 default: 560 af = AF_UNSPEC; 561 hdrsize = 0; 562 break; 563 } 564 565 while (m->m_len <= hlen) { 566 hlen -= m->m_len; 567 m = m->m_next; 568 } 569 if (m->m_len < (hlen + hdrsize)) { 570 /* 571 * protocol header not in a single mbuf. 572 * We can't cope with this situation right 573 * now (but it shouldn't ever happen, really, anyhow). 574 */ 575 #ifdef DEBUG 576 printf("altq_etherclassify: headers span multiple mbufs: " 577 "%d < %d\n", m->m_len, (hlen + hdrsize)); 578 #endif 579 goto bad; 580 } 581 582 m->m_data += hlen; 583 m->m_len -= hlen; 584 585 hdr = mtod(m, caddr_t); 586 587 if (ALTQ_NEEDS_CLASSIFY(ifq)) 588 pktattr->pattr_class = 589 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 590 pktattr->pattr_af = af; 591 pktattr->pattr_hdr = hdr; 592 593 m->m_data -= hlen; 594 m->m_len += hlen; 595 596 return; 597 598 bad: 599 pktattr->pattr_class = NULL; 600 pktattr->pattr_hdr = NULL; 601 pktattr->pattr_af = AF_UNSPEC; 602 } 603 #endif /* ALTQ */ 604 605 /* 606 * Process a received Ethernet packet; 607 * the packet is in the mbuf chain m with 608 * the ether header. 609 */ 610 void 611 ether_input(struct ifnet *ifp, struct mbuf *m) 612 { 613 struct ethercom *ec = (struct ethercom *) ifp; 614 struct ifqueue *inq; 615 u_int16_t etype; 616 struct ether_header *eh; 617 #if defined (ISO) || defined (LLC) || defined(NETATALK) 618 struct llc *l; 619 #endif 620 621 if ((ifp->if_flags & IFF_UP) == 0) { 622 m_freem(m); 623 return; 624 } 625 626 #ifdef MBUFTRACE 627 m_claimm(m, &ec->ec_rx_mowner); 628 #endif 629 eh = mtod(m, struct ether_header *); 630 etype = ntohs(eh->ether_type); 631 632 /* 633 * Determine if the packet is within its size limits. 634 */ 635 if (m->m_pkthdr.len > 636 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 637 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 638 bigpktppslim)) { 639 printf("%s: discarding oversize frame (len=%d)\n", 640 ifp->if_xname, m->m_pkthdr.len); 641 } 642 m_freem(m); 643 return; 644 } 645 646 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 647 /* 648 * If this is not a simplex interface, drop the packet 649 * if it came from us. 650 */ 651 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 652 memcmp(LLADDR(ifp->if_sadl), eh->ether_shost, 653 ETHER_ADDR_LEN) == 0) { 654 m_freem(m); 655 return; 656 } 657 658 if (memcmp(etherbroadcastaddr, 659 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 660 m->m_flags |= M_BCAST; 661 else 662 m->m_flags |= M_MCAST; 663 ifp->if_imcasts++; 664 } 665 666 /* If the CRC is still on the packet, trim it off. */ 667 if (m->m_flags & M_HASFCS) { 668 m_adj(m, -ETHER_CRC_LEN); 669 m->m_flags &= ~M_HASFCS; 670 } 671 672 ifp->if_ibytes += m->m_pkthdr.len; 673 674 #if NBRIDGE > 0 675 /* 676 * Tap the packet off here for a bridge. bridge_input() 677 * will return NULL if it has consumed the packet, otherwise 678 * it gets processed as normal. Note that bridge_input() 679 * will always return the original packet if we need to 680 * process it locally. 681 */ 682 if (ifp->if_bridge) { 683 /* clear M_PROMISC, in case the packets comes from a vlan */ 684 m->m_flags &= ~M_PROMISC; 685 m = bridge_input(ifp, m); 686 if (m == NULL) 687 return; 688 689 /* 690 * Bridge has determined that the packet is for us. 691 * Update our interface pointer -- we may have had 692 * to "bridge" the packet locally. 693 */ 694 ifp = m->m_pkthdr.rcvif; 695 } else 696 #endif /* NBRIDGE > 0 */ 697 { 698 699 #if NCARP > 0 700 if (ifp->if_carp && ifp->if_type != IFT_CARP) { 701 /* 702 * clear M_PROMISC, in case the packets comes from a 703 * vlan 704 */ 705 m->m_flags &= ~M_PROMISC; 706 if (carp_input(m, (u_int8_t *)&eh->ether_shost, 707 (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0) 708 return; 709 } 710 #endif /* NCARP > 0 */ 711 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 && 712 (ifp->if_flags & IFF_PROMISC) != 0 && 713 memcmp(LLADDR(ifp->if_sadl), eh->ether_dhost, 714 ETHER_ADDR_LEN) != 0) { 715 m->m_flags |= M_PROMISC; 716 } 717 } 718 719 #ifdef PFIL_HOOKS 720 if ((m->m_flags & M_PROMISC) == 0) { 721 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 722 return; 723 if (m == NULL) 724 return; 725 726 eh = mtod(m, struct ether_header *); 727 etype = ntohs(eh->ether_type); 728 } 729 #endif 730 731 /* 732 * If VLANs are configured on the interface, check to 733 * see if the device performed the decapsulation and 734 * provided us with the tag. 735 */ 736 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 737 #if NVLAN > 0 738 /* 739 * vlan_input() will either recursively call ether_input() 740 * or drop the packet. 741 */ 742 vlan_input(ifp, m); 743 #else 744 m_freem(m); 745 #endif 746 return; 747 } 748 749 #if NAGR > 0 750 if (ifp->if_agrprivate && 751 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 752 m->m_flags &= ~M_PROMISC; 753 agr_input(ifp, m); 754 return; 755 } 756 #endif /* NAGR > 0 */ 757 758 /* 759 * Handle protocols that expect to have the Ethernet header 760 * (and possibly FCS) intact. 761 */ 762 switch (etype) { 763 #if NVLAN > 0 764 case ETHERTYPE_VLAN: 765 /* 766 * vlan_input() will either recursively call ether_input() 767 * or drop the packet. 768 */ 769 if (((struct ethercom *)ifp)->ec_nvlans != 0) 770 vlan_input(ifp, m); 771 else 772 m_freem(m); 773 return; 774 #endif /* NVLAN > 0 */ 775 #if NPPPOE > 0 776 case ETHERTYPE_PPPOEDISC: 777 case ETHERTYPE_PPPOE: 778 if (m->m_flags & M_PROMISC) { 779 m_freem(m); 780 return; 781 } 782 #ifndef PPPOE_SERVER 783 if (m->m_flags & (M_MCAST | M_BCAST)) { 784 m_freem(m); 785 return; 786 } 787 #endif 788 789 if (etype == ETHERTYPE_PPPOEDISC) 790 inq = &ppoediscinq; 791 else 792 inq = &ppoeinq; 793 if (IF_QFULL(inq)) { 794 IF_DROP(inq); 795 m_freem(m); 796 } else 797 IF_ENQUEUE(inq, m); 798 #ifndef __HAVE_GENERIC_SOFT_INTERRUPTS 799 if (!callout_pending(&pppoe_softintr)) 800 callout_reset(&pppoe_softintr, 1, pppoe_softintr_handler, NULL); 801 #else 802 softintr_schedule(pppoe_softintr); 803 #endif 804 return; 805 #endif /* NPPPOE > 0 */ 806 case ETHERTYPE_SLOWPROTOCOLS: { 807 uint8_t subtype; 808 809 #if defined(DIAGNOSTIC) 810 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 811 panic("ether_input: too short slow protocol packet"); 812 } 813 #endif 814 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 815 switch (subtype) { 816 #if NAGR > 0 817 case SLOWPROTOCOLS_SUBTYPE_LACP: 818 if (ifp->if_agrprivate) { 819 ieee8023ad_lacp_input(ifp, m); 820 return; 821 } 822 break; 823 824 case SLOWPROTOCOLS_SUBTYPE_MARKER: 825 if (ifp->if_agrprivate) { 826 ieee8023ad_marker_input(ifp, m); 827 return; 828 } 829 break; 830 #endif /* NAGR > 0 */ 831 default: 832 if (subtype == 0 || subtype > 10) { 833 /* illegal value */ 834 m_freem(m); 835 return; 836 } 837 /* unknown subtype */ 838 break; 839 } 840 /* FALLTHROUGH */ 841 } 842 default: 843 if (m->m_flags & M_PROMISC) { 844 m_freem(m); 845 return; 846 } 847 } 848 849 /* If the CRC is still on the packet, trim it off. */ 850 if (m->m_flags & M_HASFCS) { 851 m_adj(m, -ETHER_CRC_LEN); 852 m->m_flags &= ~M_HASFCS; 853 } 854 855 if (etype > ETHERMTU + sizeof (struct ether_header)) { 856 /* Strip off the Ethernet header. */ 857 m_adj(m, sizeof(struct ether_header)); 858 859 switch (etype) { 860 #ifdef INET 861 case ETHERTYPE_IP: 862 #ifdef GATEWAY 863 if (ipflow_fastforward(m)) 864 return; 865 #endif 866 schednetisr(NETISR_IP); 867 inq = &ipintrq; 868 break; 869 870 case ETHERTYPE_ARP: 871 schednetisr(NETISR_ARP); 872 inq = &arpintrq; 873 break; 874 875 case ETHERTYPE_REVARP: 876 revarpinput(m); /* XXX queue? */ 877 return; 878 #endif 879 #ifdef INET6 880 case ETHERTYPE_IPV6: 881 schednetisr(NETISR_IPV6); 882 inq = &ip6intrq; 883 break; 884 #endif 885 #ifdef IPX 886 case ETHERTYPE_IPX: 887 schednetisr(NETISR_IPX); 888 inq = &ipxintrq; 889 break; 890 #endif 891 #ifdef NETATALK 892 case ETHERTYPE_ATALK: 893 schednetisr(NETISR_ATALK); 894 inq = &atintrq1; 895 break; 896 case ETHERTYPE_AARP: 897 /* probably this should be done with a NETISR as well */ 898 aarpinput(ifp, m); /* XXX */ 899 return; 900 #endif /* NETATALK */ 901 default: 902 m_freem(m); 903 return; 904 } 905 } else { 906 #if defined (ISO) || defined (LLC) || defined (NETATALK) 907 l = (struct llc *)(eh+1); 908 switch (l->llc_dsap) { 909 #ifdef NETATALK 910 case LLC_SNAP_LSAP: 911 switch (l->llc_control) { 912 case LLC_UI: 913 if (l->llc_ssap != LLC_SNAP_LSAP) { 914 goto dropanyway; 915 } 916 917 if (Bcmp(&(l->llc_snap_org_code)[0], 918 at_org_code, sizeof(at_org_code)) == 0 && 919 ntohs(l->llc_snap_ether_type) == 920 ETHERTYPE_ATALK) { 921 inq = &atintrq2; 922 m_adj(m, sizeof(struct ether_header) 923 + sizeof(struct llc)); 924 schednetisr(NETISR_ATALK); 925 break; 926 } 927 928 if (Bcmp(&(l->llc_snap_org_code)[0], 929 aarp_org_code, 930 sizeof(aarp_org_code)) == 0 && 931 ntohs(l->llc_snap_ether_type) == 932 ETHERTYPE_AARP) { 933 m_adj( m, sizeof(struct ether_header) 934 + sizeof(struct llc)); 935 aarpinput(ifp, m); /* XXX */ 936 return; 937 } 938 939 default: 940 goto dropanyway; 941 } 942 break; 943 #endif /* NETATALK */ 944 #ifdef ISO 945 case LLC_ISO_LSAP: 946 switch (l->llc_control) { 947 case LLC_UI: 948 /* LLC_UI_P forbidden in class 1 service */ 949 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 950 (l->llc_ssap == LLC_ISO_LSAP)) { 951 /* LSAP for ISO */ 952 /* XXX length computation?? */ 953 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 954 m_adj(m, etype - m->m_pkthdr.len); 955 956 #ifdef ARGO_DEBUG 957 if (argo_debug[D_ETHER]) 958 printf("clnp packet"); 959 #endif 960 schednetisr(NETISR_ISO); 961 inq = &clnlintrq; 962 break; 963 } 964 goto dropanyway; 965 966 case LLC_XID: 967 case LLC_XID_P: 968 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 969 /* XXX m_pullup? */ 970 goto dropanyway; 971 l->llc_window = 0; 972 l->llc_fid = LLC_XID_FORMAT_BASIC; 973 l->llc_class = LLC_XID_CLASS_I; 974 l->llc_dsap = l->llc_ssap = 0; 975 /* Fall through to */ 976 case LLC_TEST: 977 case LLC_TEST_P: 978 { 979 struct sockaddr sa; 980 struct ether_header *eh2; 981 int i; 982 u_char c = l->llc_dsap; 983 984 l->llc_dsap = l->llc_ssap; 985 l->llc_ssap = c; 986 m_adj(m, sizeof(struct ether_header)); 987 /* XXX we can optimize here? */ 988 if (m->m_flags & (M_BCAST | M_MCAST)) 989 bcopy(LLADDR(ifp->if_sadl), 990 (caddr_t)eh->ether_dhost, 6); 991 sa.sa_family = AF_UNSPEC; 992 sa.sa_len = sizeof(sa); 993 eh2 = (struct ether_header *)sa.sa_data; 994 for (i = 0; i < 6; i++) { 995 eh2->ether_shost[i] = c = 996 eh->ether_dhost[i]; 997 eh2->ether_dhost[i] = 998 eh->ether_dhost[i] = 999 eh->ether_shost[i]; 1000 eh->ether_shost[i] = c; 1001 } 1002 ifp->if_output(ifp, m, &sa, NULL); 1003 return; 1004 } 1005 default: 1006 m_freem(m); 1007 return; 1008 } 1009 break; 1010 #endif /* ISO */ 1011 #if defined (ISO) || defined (NETATALK) 1012 dropanyway: 1013 #endif 1014 default: 1015 m_freem(m); 1016 return; 1017 } 1018 #else /* ISO || LLC || NETATALK*/ 1019 m_freem(m); 1020 return; 1021 #endif /* ISO || LLC || NETATALK*/ 1022 } 1023 1024 if (IF_QFULL(inq)) { 1025 IF_DROP(inq); 1026 m_freem(m); 1027 } else 1028 IF_ENQUEUE(inq, m); 1029 } 1030 1031 /* 1032 * Convert Ethernet address to printable (loggable) representation. 1033 */ 1034 char * 1035 ether_sprintf(const u_char *ap) 1036 { 1037 static char etherbuf[3 * ETHER_ADDR_LEN]; 1038 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1039 return etherbuf; 1040 } 1041 1042 char * 1043 ether_snprintf(char *buf, size_t len, const u_char *ap) 1044 { 1045 char *cp = buf; 1046 size_t i; 1047 1048 for (i = 0; i < len / 3; i++) { 1049 *cp++ = hexdigits[*ap >> 4]; 1050 *cp++ = hexdigits[*ap++ & 0xf]; 1051 *cp++ = ':'; 1052 } 1053 *--cp = '\0'; 1054 return buf; 1055 } 1056 1057 /* 1058 * Perform common duties while attaching to interface list 1059 */ 1060 void 1061 ether_ifattach(struct ifnet *ifp, const u_int8_t *lla) 1062 { 1063 struct ethercom *ec = (struct ethercom *)ifp; 1064 1065 ifp->if_type = IFT_ETHER; 1066 ifp->if_addrlen = ETHER_ADDR_LEN; 1067 ifp->if_hdrlen = ETHER_HDR_LEN; 1068 ifp->if_dlt = DLT_EN10MB; 1069 ifp->if_mtu = ETHERMTU; 1070 ifp->if_output = ether_output; 1071 ifp->if_input = ether_input; 1072 if (ifp->if_baudrate == 0) 1073 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1074 1075 if_alloc_sadl(ifp); 1076 memcpy(LLADDR(ifp->if_sadl), lla, ifp->if_addrlen); 1077 1078 LIST_INIT(&ec->ec_multiaddrs); 1079 ifp->if_broadcastaddr = etherbroadcastaddr; 1080 #if NBPFILTER > 0 1081 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1082 #endif 1083 #ifdef MBUFTRACE 1084 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1085 sizeof(ec->ec_tx_mowner.mo_name)); 1086 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1087 sizeof(ec->ec_tx_mowner.mo_descr)); 1088 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1089 sizeof(ec->ec_rx_mowner.mo_name)); 1090 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1091 sizeof(ec->ec_rx_mowner.mo_descr)); 1092 MOWNER_ATTACH(&ec->ec_tx_mowner); 1093 MOWNER_ATTACH(&ec->ec_rx_mowner); 1094 ifp->if_mowner = &ec->ec_tx_mowner; 1095 #endif 1096 } 1097 1098 void 1099 ether_ifdetach(struct ifnet *ifp) 1100 { 1101 struct ethercom *ec = (void *) ifp; 1102 struct ether_multi *enm; 1103 int s; 1104 1105 #if NBRIDGE > 0 1106 if (ifp->if_bridge) 1107 bridge_ifdetach(ifp); 1108 #endif 1109 1110 #if NBPFILTER > 0 1111 bpfdetach(ifp); 1112 #endif 1113 1114 #if NVLAN > 0 1115 if (ec->ec_nvlans) 1116 vlan_ifdetach(ifp); 1117 #endif 1118 1119 s = splnet(); 1120 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1121 LIST_REMOVE(enm, enm_list); 1122 free(enm, M_IFMADDR); 1123 ec->ec_multicnt--; 1124 } 1125 splx(s); 1126 1127 #if 0 /* done in if_detach() */ 1128 if_free_sadl(ifp); 1129 #endif 1130 1131 MOWNER_DETACH(&ec->ec_rx_mowner); 1132 MOWNER_DETACH(&ec->ec_tx_mowner); 1133 } 1134 1135 #if 0 1136 /* 1137 * This is for reference. We have a table-driven version 1138 * of the little-endian crc32 generator, which is faster 1139 * than the double-loop. 1140 */ 1141 u_int32_t 1142 ether_crc32_le(const u_int8_t *buf, size_t len) 1143 { 1144 u_int32_t c, crc, carry; 1145 size_t i, j; 1146 1147 crc = 0xffffffffU; /* initial value */ 1148 1149 for (i = 0; i < len; i++) { 1150 c = buf[i]; 1151 for (j = 0; j < 8; j++) { 1152 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1153 crc >>= 1; 1154 c >>= 1; 1155 if (carry) 1156 crc = (crc ^ ETHER_CRC_POLY_LE); 1157 } 1158 } 1159 1160 return (crc); 1161 } 1162 #else 1163 u_int32_t 1164 ether_crc32_le(const u_int8_t *buf, size_t len) 1165 { 1166 static const u_int32_t crctab[] = { 1167 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1168 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1169 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1170 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1171 }; 1172 u_int32_t crc; 1173 size_t i; 1174 1175 crc = 0xffffffffU; /* initial value */ 1176 1177 for (i = 0; i < len; i++) { 1178 crc ^= buf[i]; 1179 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1180 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1181 } 1182 1183 return (crc); 1184 } 1185 #endif 1186 1187 u_int32_t 1188 ether_crc32_be(const u_int8_t *buf, size_t len) 1189 { 1190 u_int32_t c, crc, carry; 1191 size_t i, j; 1192 1193 crc = 0xffffffffU; /* initial value */ 1194 1195 for (i = 0; i < len; i++) { 1196 c = buf[i]; 1197 for (j = 0; j < 8; j++) { 1198 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1199 crc <<= 1; 1200 c >>= 1; 1201 if (carry) 1202 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1203 } 1204 } 1205 1206 return (crc); 1207 } 1208 1209 #ifdef INET 1210 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1211 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1212 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1213 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1214 #endif 1215 #ifdef INET6 1216 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1217 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1218 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1219 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1220 #endif 1221 1222 /* 1223 * ether_aton implementation, not using a static buffer. 1224 */ 1225 int 1226 ether_nonstatic_aton(u_char *dest, char *str) 1227 { 1228 int i; 1229 char *cp = str; 1230 u_char val[6]; 1231 1232 #define set_value \ 1233 if (*cp > '9' && *cp < 'a') \ 1234 *cp -= 'A' - 10; \ 1235 else if (*cp > '9') \ 1236 *cp -= 'a' - 10; \ 1237 else \ 1238 *cp -= '0' 1239 1240 for (i = 0; i < 6; i++, cp++) { 1241 if (!isxdigit(*cp)) 1242 return (1); 1243 set_value; 1244 val[i] = *cp++; 1245 if (isxdigit(*cp)) { 1246 set_value; 1247 val[i] *= 16; 1248 val[i] += *cp++; 1249 } 1250 if (*cp == ':' || i == 5) 1251 continue; 1252 else 1253 return 1; 1254 } 1255 memcpy(dest, val, 6); 1256 1257 return 0; 1258 } 1259 1260 1261 /* 1262 * Convert a sockaddr into an Ethernet address or range of Ethernet 1263 * addresses. 1264 */ 1265 int 1266 ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN], 1267 u_int8_t addrhi[ETHER_ADDR_LEN]) 1268 { 1269 #ifdef INET 1270 struct sockaddr_in *sin; 1271 #endif /* INET */ 1272 #ifdef INET6 1273 struct sockaddr_in6 *sin6; 1274 #endif /* INET6 */ 1275 1276 switch (sa->sa_family) { 1277 1278 case AF_UNSPEC: 1279 bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN); 1280 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1281 break; 1282 1283 #ifdef INET 1284 case AF_INET: 1285 sin = satosin(sa); 1286 if (sin->sin_addr.s_addr == INADDR_ANY) { 1287 /* 1288 * An IP address of INADDR_ANY means listen to 1289 * or stop listening to all of the Ethernet 1290 * multicast addresses used for IP. 1291 * (This is for the sake of IP multicast routers.) 1292 */ 1293 bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN); 1294 bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN); 1295 } 1296 else { 1297 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1298 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1299 } 1300 break; 1301 #endif 1302 #ifdef INET6 1303 case AF_INET6: 1304 sin6 = satosin6(sa); 1305 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1306 /* 1307 * An IP6 address of 0 means listen to or stop 1308 * listening to all of the Ethernet multicast 1309 * address used for IP6. 1310 * (This is used for multicast routers.) 1311 */ 1312 bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN); 1313 bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN); 1314 } else { 1315 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1316 bcopy(addrlo, addrhi, ETHER_ADDR_LEN); 1317 } 1318 break; 1319 #endif 1320 1321 default: 1322 return (EAFNOSUPPORT); 1323 } 1324 return (0); 1325 } 1326 1327 /* 1328 * Add an Ethernet multicast address or range of addresses to the list for a 1329 * given interface. 1330 */ 1331 int 1332 ether_addmulti(struct ifreq *ifr, struct ethercom *ec) 1333 { 1334 struct ether_multi *enm; 1335 u_char addrlo[ETHER_ADDR_LEN]; 1336 u_char addrhi[ETHER_ADDR_LEN]; 1337 int s = splnet(), error; 1338 1339 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1340 if (error != 0) { 1341 splx(s); 1342 return (error); 1343 } 1344 1345 /* 1346 * Verify that we have valid Ethernet multicast addresses. 1347 */ 1348 if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) { 1349 splx(s); 1350 return (EINVAL); 1351 } 1352 /* 1353 * See if the address range is already in the list. 1354 */ 1355 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1356 if (enm != NULL) { 1357 /* 1358 * Found it; just increment the reference count. 1359 */ 1360 ++enm->enm_refcount; 1361 splx(s); 1362 return (0); 1363 } 1364 /* 1365 * New address or range; malloc a new multicast record 1366 * and link it into the interface's multicast list. 1367 */ 1368 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1369 if (enm == NULL) { 1370 splx(s); 1371 return (ENOBUFS); 1372 } 1373 bcopy(addrlo, enm->enm_addrlo, 6); 1374 bcopy(addrhi, enm->enm_addrhi, 6); 1375 enm->enm_refcount = 1; 1376 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1377 ec->ec_multicnt++; 1378 splx(s); 1379 /* 1380 * Return ENETRESET to inform the driver that the list has changed 1381 * and its reception filter should be adjusted accordingly. 1382 */ 1383 return (ENETRESET); 1384 } 1385 1386 /* 1387 * Delete a multicast address record. 1388 */ 1389 int 1390 ether_delmulti(struct ifreq *ifr, struct ethercom *ec) 1391 { 1392 struct ether_multi *enm; 1393 u_char addrlo[ETHER_ADDR_LEN]; 1394 u_char addrhi[ETHER_ADDR_LEN]; 1395 int s = splnet(), error; 1396 1397 error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi); 1398 if (error != 0) { 1399 splx(s); 1400 return (error); 1401 } 1402 1403 /* 1404 * Look ur the address in our list. 1405 */ 1406 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1407 if (enm == NULL) { 1408 splx(s); 1409 return (ENXIO); 1410 } 1411 if (--enm->enm_refcount != 0) { 1412 /* 1413 * Still some claims to this record. 1414 */ 1415 splx(s); 1416 return (0); 1417 } 1418 /* 1419 * No remaining claims to this record; unlink and free it. 1420 */ 1421 LIST_REMOVE(enm, enm_list); 1422 free(enm, M_IFMADDR); 1423 ec->ec_multicnt--; 1424 splx(s); 1425 /* 1426 * Return ENETRESET to inform the driver that the list has changed 1427 * and its reception filter should be adjusted accordingly. 1428 */ 1429 return (ENETRESET); 1430 } 1431 1432 /* 1433 * Common ioctls for Ethernet interfaces. Note, we must be 1434 * called at splnet(). 1435 */ 1436 int 1437 ether_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1438 { 1439 struct ethercom *ec = (void *) ifp; 1440 struct ifreq *ifr = (struct ifreq *)data; 1441 struct ifaddr *ifa = (struct ifaddr *)data; 1442 int error = 0; 1443 1444 switch (cmd) { 1445 case SIOCSIFADDR: 1446 ifp->if_flags |= IFF_UP; 1447 switch (ifa->ifa_addr->sa_family) { 1448 case AF_LINK: 1449 { 1450 struct sockaddr_dl *sdl = 1451 (struct sockaddr_dl *) ifa->ifa_addr; 1452 1453 if (sdl->sdl_type != IFT_ETHER || 1454 sdl->sdl_alen != ifp->if_addrlen) { 1455 error = EINVAL; 1456 break; 1457 } 1458 1459 memcpy(LLADDR(ifp->if_sadl), LLADDR(sdl), 1460 ifp->if_addrlen); 1461 1462 /* Set new address. */ 1463 error = (*ifp->if_init)(ifp); 1464 break; 1465 } 1466 #ifdef INET 1467 case AF_INET: 1468 if ((ifp->if_flags & IFF_RUNNING) == 0 && 1469 (error = (*ifp->if_init)(ifp)) != 0) 1470 break; 1471 arp_ifinit(ifp, ifa); 1472 break; 1473 #endif /* INET */ 1474 default: 1475 if ((ifp->if_flags & IFF_RUNNING) == 0) 1476 error = (*ifp->if_init)(ifp); 1477 break; 1478 } 1479 break; 1480 1481 case SIOCGIFADDR: 1482 memcpy(((struct sockaddr *)&ifr->ifr_data)->sa_data, 1483 LLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 1484 break; 1485 1486 case SIOCSIFMTU: 1487 { 1488 int maxmtu; 1489 1490 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1491 maxmtu = ETHERMTU_JUMBO; 1492 else 1493 maxmtu = ETHERMTU; 1494 1495 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1496 error = EINVAL; 1497 else { 1498 ifp->if_mtu = ifr->ifr_mtu; 1499 1500 /* Make sure the device notices the MTU change. */ 1501 if (ifp->if_flags & IFF_UP) 1502 error = (*ifp->if_init)(ifp); 1503 } 1504 break; 1505 } 1506 1507 case SIOCSIFFLAGS: 1508 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 1509 /* 1510 * If interface is marked down and it is running, 1511 * then stop and disable it. 1512 */ 1513 (*ifp->if_stop)(ifp, 1); 1514 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 1515 /* 1516 * If interface is marked up and it is stopped, then 1517 * start it. 1518 */ 1519 error = (*ifp->if_init)(ifp); 1520 } else if ((ifp->if_flags & IFF_UP) != 0) { 1521 /* 1522 * Reset the interface to pick up changes in any other 1523 * flags that affect the hardware state. 1524 */ 1525 error = (*ifp->if_init)(ifp); 1526 } 1527 break; 1528 1529 case SIOCADDMULTI: 1530 error = ether_addmulti(ifr, ec); 1531 break; 1532 1533 case SIOCDELMULTI: 1534 error = ether_delmulti(ifr, ec); 1535 break; 1536 1537 default: 1538 error = ENOTTY; 1539 } 1540 1541 return (error); 1542 } 1543
Indexes created Tue Sep 23 02:09:52 GMT 2025