if_ethersubr.c revision 1.176.4.4
1 /* $NetBSD: if_ethersubr.c,v 1.176.4.4 2011/05/31 03:05:06 rmind 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 1.176.4.4 2011/05/31 03:05:06 rmind 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_mpls.h" 72 #include "opt_gateway.h" 73 #include "opt_pfil_hooks.h" 74 #include "opt_pppoe.h" 75 #include "vlan.h" 76 #include "pppoe.h" 77 #include "bridge.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/cpu.h> 94 #include <sys/intr.h> 95 #include <sys/device.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 #include <net/if_media.h> 105 #include <dev/mii/mii.h> 106 #include <dev/mii/miivar.h> 107 108 #if NARP == 0 109 /* 110 * XXX there should really be a way to issue this warning from within config(8) 111 */ 112 #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. 113 #endif 114 115 #include <net/bpf.h> 116 117 #include <net/if_ether.h> 118 #include <net/if_vlanvar.h> 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 #ifdef MPLS 181 #include <netmpls/mpls.h> 182 #include <netmpls/mpls_var.h> 183 #endif 184 185 static struct timeval bigpktppslim_last; 186 static int bigpktppslim = 2; /* XXX */ 187 static int bigpktpps_count; 188 189 190 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 191 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 192 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 193 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 194 #define senderr(e) { error = (e); goto bad;} 195 196 static int ether_output(struct ifnet *, struct mbuf *, 197 const struct sockaddr *, struct rtentry *); 198 199 /* 200 * Ethernet output routine. 201 * Encapsulate a packet of type family for the local net. 202 * Assumes that ifp is actually pointer to ethercom structure. 203 */ 204 static int 205 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 206 const struct sockaddr * const dst, 207 struct rtentry *rt0) 208 { 209 uint16_t etype = 0; 210 int error = 0, hdrcmplt = 0; 211 uint8_t esrc[6], edst[6]; 212 struct mbuf *m = m0; 213 struct rtentry *rt; 214 struct mbuf *mcopy = NULL; 215 struct ether_header *eh; 216 struct ifnet *ifp = ifp0; 217 ALTQ_DECL(struct altq_pktattr pktattr;) 218 #ifdef INET 219 struct arphdr *ah; 220 #endif /* INET */ 221 #ifdef NETATALK 222 struct at_ifaddr *aa; 223 #endif /* NETATALK */ 224 225 #ifdef MBUFTRACE 226 m_claimm(m, ifp->if_mowner); 227 #endif 228 229 #if NCARP > 0 230 if (ifp->if_type == IFT_CARP) { 231 struct ifaddr *ifa; 232 233 /* loop back if this is going to the carp interface */ 234 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 235 (ifa = ifa_ifwithaddr(dst)) != NULL && 236 ifa->ifa_ifp == ifp0) 237 return looutput(ifp0, m, dst, rt0); 238 239 ifp = ifp->if_carpdev; 240 /* ac = (struct arpcom *)ifp; */ 241 242 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 243 (IFF_UP|IFF_RUNNING)) 244 senderr(ENETDOWN); 245 } 246 #endif /* NCARP > 0 */ 247 248 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 249 senderr(ENETDOWN); 250 if ((rt = rt0) != NULL) { 251 if ((rt->rt_flags & RTF_UP) == 0) { 252 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 253 rt->rt_refcnt--; 254 if (rt->rt_ifp != ifp) 255 return (*rt->rt_ifp->if_output) 256 (ifp, m0, dst, rt); 257 } else 258 senderr(EHOSTUNREACH); 259 } 260 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 261 if (rt->rt_gwroute == NULL) 262 goto lookup; 263 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 264 rtfree(rt); rt = rt0; 265 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 266 if ((rt = rt->rt_gwroute) == NULL) 267 senderr(EHOSTUNREACH); 268 /* the "G" test below also prevents rt == rt0 */ 269 if ((rt->rt_flags & RTF_GATEWAY) || 270 (rt->rt_ifp != ifp)) { 271 rt->rt_refcnt--; 272 rt0->rt_gwroute = NULL; 273 senderr(EHOSTUNREACH); 274 } 275 } 276 } 277 if (rt->rt_flags & RTF_REJECT) 278 if (rt->rt_rmx.rmx_expire == 0 || 279 (u_long) time_second < rt->rt_rmx.rmx_expire) 280 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 281 } 282 283 switch (dst->sa_family) { 284 285 #ifdef INET 286 case AF_INET: 287 if (m->m_flags & M_BCAST) 288 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 289 else if (m->m_flags & M_MCAST) 290 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 291 else if (!arpresolve(ifp, rt, m, dst, edst)) 292 return (0); /* if not yet resolved */ 293 /* If broadcasting on a simplex interface, loopback a copy */ 294 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 295 mcopy = m_copy(m, 0, (int)M_COPYALL); 296 etype = htons(ETHERTYPE_IP); 297 break; 298 299 case AF_ARP: 300 ah = mtod(m, struct arphdr *); 301 if (m->m_flags & M_BCAST) 302 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 303 else { 304 void *tha = ar_tha(ah); 305 306 if (tha == NULL) { 307 /* fake with ARPHDR_IEEE1394 */ 308 return 0; 309 } 310 memcpy(edst, tha, sizeof(edst)); 311 } 312 313 ah->ar_hrd = htons(ARPHRD_ETHER); 314 315 switch (ntohs(ah->ar_op)) { 316 case ARPOP_REVREQUEST: 317 case ARPOP_REVREPLY: 318 etype = htons(ETHERTYPE_REVARP); 319 break; 320 321 case ARPOP_REQUEST: 322 case ARPOP_REPLY: 323 default: 324 etype = htons(ETHERTYPE_ARP); 325 } 326 327 break; 328 #endif 329 #ifdef INET6 330 case AF_INET6: 331 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ 332 /* something bad happened */ 333 return (0); 334 } 335 etype = htons(ETHERTYPE_IPV6); 336 break; 337 #endif 338 #ifdef NETATALK 339 case AF_APPLETALK: 340 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 341 #ifdef NETATALKDEBUG 342 printf("aarpresolv failed\n"); 343 #endif /* NETATALKDEBUG */ 344 return (0); 345 } 346 /* 347 * ifaddr is the first thing in at_ifaddr 348 */ 349 aa = (struct at_ifaddr *) at_ifawithnet( 350 (const struct sockaddr_at *)dst, ifp); 351 if (aa == NULL) 352 goto bad; 353 354 /* 355 * In the phase 2 case, we need to prepend an mbuf for the 356 * llc header. Since we must preserve the value of m, 357 * which is passed to us by value, we m_copy() the first 358 * mbuf, and use it for our llc header. 359 */ 360 if (aa->aa_flags & AFA_PHASE2) { 361 struct llc llc; 362 363 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 364 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 365 llc.llc_control = LLC_UI; 366 memcpy(llc.llc_snap_org_code, at_org_code, 367 sizeof(llc.llc_snap_org_code)); 368 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 369 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 370 } else { 371 etype = htons(ETHERTYPE_ATALK); 372 } 373 break; 374 #endif /* NETATALK */ 375 #ifdef IPX 376 case AF_IPX: 377 etype = htons(ETHERTYPE_IPX); 378 memcpy(edst, 379 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 380 sizeof(edst)); 381 /* If broadcasting on a simplex interface, loopback a copy */ 382 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 383 mcopy = m_copy(m, 0, (int)M_COPYALL); 384 break; 385 #endif 386 #ifdef ISO 387 case AF_ISO: { 388 int snpalen; 389 struct llc *l; 390 const struct sockaddr_dl *sdl; 391 392 if (rt && (sdl = satocsdl(rt->rt_gateway)) && 393 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 394 memcpy(edst, CLLADDR(sdl), sizeof(edst)); 395 } else { 396 error = iso_snparesolve(ifp, 397 (const struct sockaddr_iso *)dst, 398 (char *)edst, &snpalen); 399 if (error) 400 goto bad; /* Not Resolved */ 401 } 402 /* If broadcasting on a simplex interface, loopback a copy */ 403 if (*edst & 1) 404 m->m_flags |= (M_BCAST|M_MCAST); 405 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 406 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 407 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 408 if (mcopy) { 409 eh = mtod(mcopy, struct ether_header *); 410 memcpy(eh->ether_dhost, edst, sizeof(edst)); 411 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 412 sizeof(edst)); 413 } 414 } 415 M_PREPEND(m, 3, M_DONTWAIT); 416 if (m == NULL) 417 return (0); 418 l = mtod(m, struct llc *); 419 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 420 l->llc_control = LLC_UI; 421 #ifdef ARGO_DEBUG 422 if (argo_debug[D_ETHER]) { 423 int i; 424 printf("unoutput: sending pkt to: "); 425 for (i=0; i<6; i++) 426 printf("%x ", edst[i] & 0xff); 427 printf("\n"); 428 } 429 #endif 430 } break; 431 #endif /* ISO */ 432 433 case pseudo_AF_HDRCMPLT: 434 hdrcmplt = 1; 435 memcpy(esrc, 436 ((const struct ether_header *)dst->sa_data)->ether_shost, 437 sizeof(esrc)); 438 /* FALLTHROUGH */ 439 440 case AF_UNSPEC: 441 memcpy(edst, 442 ((const struct ether_header *)dst->sa_data)->ether_dhost, 443 sizeof(edst)); 444 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 445 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 446 break; 447 448 default: 449 printf("%s: can't handle af%d\n", ifp->if_xname, 450 dst->sa_family); 451 senderr(EAFNOSUPPORT); 452 } 453 454 #ifdef MPLS 455 if (rt0 != NULL && rt_gettag(rt0) != NULL && 456 rt_gettag(rt0)->sa_family == AF_MPLS) { 457 union mpls_shim msh; 458 msh.s_addr = MPLS_GETSADDR(rt0); 459 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 460 etype = htons(ETHERTYPE_MPLS); 461 } 462 #endif 463 464 if (mcopy) 465 (void)looutput(ifp, mcopy, dst, rt); 466 467 /* If no ether type is set, this must be a 802.2 formatted packet. 468 */ 469 if (etype == 0) 470 etype = htons(m->m_pkthdr.len); 471 /* 472 * Add local net header. If no space in first mbuf, 473 * allocate another. 474 */ 475 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 476 if (m == 0) 477 senderr(ENOBUFS); 478 eh = mtod(m, struct ether_header *); 479 /* Note: etype is already in network byte order. */ 480 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 481 memcpy(eh->ether_dhost, edst, sizeof(edst)); 482 if (hdrcmplt) 483 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 484 else 485 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 486 sizeof(eh->ether_shost)); 487 488 #if NCARP > 0 489 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 490 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 491 sizeof(eh->ether_shost)); 492 } 493 #endif /* NCARP > 0 */ 494 495 #ifdef PFIL_HOOKS 496 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 497 return (error); 498 if (m == NULL) 499 return (0); 500 #endif 501 502 #if NBRIDGE > 0 503 /* 504 * Bridges require special output handling. 505 */ 506 if (ifp->if_bridge) 507 return (bridge_output(ifp, m, NULL, NULL)); 508 #endif 509 510 #if NCARP > 0 511 if (ifp != ifp0) 512 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 513 #endif /* NCARP > 0 */ 514 515 #ifdef ALTQ 516 /* 517 * If ALTQ is enabled on the parent interface, do 518 * classification; the queueing discipline might not 519 * require classification, but might require the 520 * address family/header pointer in the pktattr. 521 */ 522 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 523 altq_etherclassify(&ifp->if_snd, m, &pktattr); 524 #endif 525 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 526 527 bad: 528 if (m) 529 m_freem(m); 530 return (error); 531 } 532 533 #ifdef ALTQ 534 /* 535 * This routine is a slight hack to allow a packet to be classified 536 * if the Ethernet headers are present. It will go away when ALTQ's 537 * classification engine understands link headers. 538 */ 539 void 540 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 541 struct altq_pktattr *pktattr) 542 { 543 struct ether_header *eh; 544 uint16_t ether_type; 545 int hlen, af, hdrsize; 546 void *hdr; 547 548 hlen = ETHER_HDR_LEN; 549 eh = mtod(m, struct ether_header *); 550 551 ether_type = htons(eh->ether_type); 552 553 if (ether_type < ETHERMTU) { 554 /* LLC/SNAP */ 555 struct llc *llc = (struct llc *)(eh + 1); 556 hlen += 8; 557 558 if (m->m_len < hlen || 559 llc->llc_dsap != LLC_SNAP_LSAP || 560 llc->llc_ssap != LLC_SNAP_LSAP || 561 llc->llc_control != LLC_UI) { 562 /* Not SNAP. */ 563 goto bad; 564 } 565 566 ether_type = htons(llc->llc_un.type_snap.ether_type); 567 } 568 569 switch (ether_type) { 570 case ETHERTYPE_IP: 571 af = AF_INET; 572 hdrsize = 20; /* sizeof(struct ip) */ 573 break; 574 575 case ETHERTYPE_IPV6: 576 af = AF_INET6; 577 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 578 break; 579 580 default: 581 af = AF_UNSPEC; 582 hdrsize = 0; 583 break; 584 } 585 586 while (m->m_len <= hlen) { 587 hlen -= m->m_len; 588 m = m->m_next; 589 } 590 if (m->m_len < (hlen + hdrsize)) { 591 /* 592 * protocol header not in a single mbuf. 593 * We can't cope with this situation right 594 * now (but it shouldn't ever happen, really, anyhow). 595 */ 596 #ifdef DEBUG 597 printf("altq_etherclassify: headers span multiple mbufs: " 598 "%d < %d\n", m->m_len, (hlen + hdrsize)); 599 #endif 600 goto bad; 601 } 602 603 m->m_data += hlen; 604 m->m_len -= hlen; 605 606 hdr = mtod(m, void *); 607 608 if (ALTQ_NEEDS_CLASSIFY(ifq)) 609 pktattr->pattr_class = 610 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 611 pktattr->pattr_af = af; 612 pktattr->pattr_hdr = hdr; 613 614 m->m_data -= hlen; 615 m->m_len += hlen; 616 617 return; 618 619 bad: 620 pktattr->pattr_class = NULL; 621 pktattr->pattr_hdr = NULL; 622 pktattr->pattr_af = AF_UNSPEC; 623 } 624 #endif /* ALTQ */ 625 626 /* 627 * Process a received Ethernet packet; 628 * the packet is in the mbuf chain m with 629 * the ether header. 630 */ 631 void 632 ether_input(struct ifnet *ifp, struct mbuf *m) 633 { 634 struct ethercom *ec = (struct ethercom *) ifp; 635 struct ifqueue *inq; 636 uint16_t etype; 637 struct ether_header *eh; 638 size_t ehlen; 639 #if defined (ISO) || defined (LLC) || defined(NETATALK) 640 struct llc *l; 641 #endif 642 643 if ((ifp->if_flags & IFF_UP) == 0) { 644 m_freem(m); 645 return; 646 } 647 648 #ifdef MBUFTRACE 649 m_claimm(m, &ec->ec_rx_mowner); 650 #endif 651 eh = mtod(m, struct ether_header *); 652 etype = ntohs(eh->ether_type); 653 ehlen = sizeof(*eh); 654 655 /* 656 * Determine if the packet is within its size limits. 657 */ 658 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 659 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 660 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 661 bigpktppslim)) { 662 printf("%s: discarding oversize frame (len=%d)\n", 663 ifp->if_xname, m->m_pkthdr.len); 664 } 665 m_freem(m); 666 return; 667 } 668 669 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 670 /* 671 * If this is not a simplex interface, drop the packet 672 * if it came from us. 673 */ 674 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 675 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 676 ETHER_ADDR_LEN) == 0) { 677 m_freem(m); 678 return; 679 } 680 681 if (memcmp(etherbroadcastaddr, 682 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 683 m->m_flags |= M_BCAST; 684 else 685 m->m_flags |= M_MCAST; 686 ifp->if_imcasts++; 687 } 688 689 /* If the CRC is still on the packet, trim it off. */ 690 if (m->m_flags & M_HASFCS) { 691 m_adj(m, -ETHER_CRC_LEN); 692 m->m_flags &= ~M_HASFCS; 693 } 694 695 ifp->if_ibytes += m->m_pkthdr.len; 696 697 #if NBRIDGE > 0 698 /* 699 * Tap the packet off here for a bridge. bridge_input() 700 * will return NULL if it has consumed the packet, otherwise 701 * it gets processed as normal. Note that bridge_input() 702 * will always return the original packet if we need to 703 * process it locally. 704 */ 705 if (ifp->if_bridge) { 706 /* clear M_PROMISC, in case the packets comes from a vlan */ 707 m->m_flags &= ~M_PROMISC; 708 m = bridge_input(ifp, m); 709 if (m == NULL) 710 return; 711 712 /* 713 * Bridge has determined that the packet is for us. 714 * Update our interface pointer -- we may have had 715 * to "bridge" the packet locally. 716 */ 717 ifp = m->m_pkthdr.rcvif; 718 } else 719 #endif /* NBRIDGE > 0 */ 720 { 721 722 #if NCARP > 0 723 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 724 /* 725 * clear M_PROMISC, in case the packets comes from a 726 * vlan 727 */ 728 m->m_flags &= ~M_PROMISC; 729 if (carp_input(m, (uint8_t *)&eh->ether_shost, 730 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 731 return; 732 } 733 #endif /* NCARP > 0 */ 734 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 735 (ifp->if_flags & IFF_PROMISC) != 0 && 736 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 737 ETHER_ADDR_LEN) != 0) { 738 m->m_flags |= M_PROMISC; 739 } 740 } 741 742 #ifdef PFIL_HOOKS 743 if ((m->m_flags & M_PROMISC) == 0) { 744 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 745 return; 746 if (m == NULL) 747 return; 748 749 eh = mtod(m, struct ether_header *); 750 etype = ntohs(eh->ether_type); 751 ehlen = sizeof(*eh); 752 } 753 #endif 754 755 #if NAGR > 0 756 if (ifp->if_agrprivate && 757 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 758 m->m_flags &= ~M_PROMISC; 759 agr_input(ifp, m); 760 return; 761 } 762 #endif /* NAGR > 0 */ 763 764 /* 765 * If VLANs are configured on the interface, check to 766 * see if the device performed the decapsulation and 767 * provided us with the tag. 768 */ 769 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 770 #if NVLAN > 0 771 /* 772 * vlan_input() will either recursively call ether_input() 773 * or drop the packet. 774 */ 775 vlan_input(ifp, m); 776 #else 777 m_freem(m); 778 #endif 779 return; 780 } 781 782 /* 783 * Handle protocols that expect to have the Ethernet header 784 * (and possibly FCS) intact. 785 */ 786 switch (etype) { 787 case ETHERTYPE_VLAN: { 788 struct ether_vlan_header *evl = (void *)eh; 789 /* 790 * If there is a tag of 0, then the VLAN header was probably 791 * just being used to store the priority. Extract the ether 792 * type, and if IP or IPV6, let them deal with it. 793 */ 794 if (m->m_len <= sizeof(*evl) 795 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 796 etype = ntohs(evl->evl_proto); 797 ehlen = sizeof(*evl); 798 if ((m->m_flags & M_PROMISC) == 0 799 && (etype == ETHERTYPE_IP 800 || etype == ETHERTYPE_IPV6)) 801 break; 802 } 803 #if NVLAN > 0 804 /* 805 * vlan_input() will either recursively call ether_input() 806 * or drop the packet. 807 */ 808 if (((struct ethercom *)ifp)->ec_nvlans != 0) 809 vlan_input(ifp, m); 810 else 811 #endif /* NVLAN > 0 */ 812 m_freem(m); 813 return; 814 } 815 #if NPPPOE > 0 816 case ETHERTYPE_PPPOEDISC: 817 case ETHERTYPE_PPPOE: 818 if (m->m_flags & M_PROMISC) { 819 m_freem(m); 820 return; 821 } 822 #ifndef PPPOE_SERVER 823 if (m->m_flags & (M_MCAST | M_BCAST)) { 824 m_freem(m); 825 return; 826 } 827 #endif 828 829 if (etype == ETHERTYPE_PPPOEDISC) 830 inq = &ppoediscinq; 831 else 832 inq = &ppoeinq; 833 if (IF_QFULL(inq)) { 834 IF_DROP(inq); 835 m_freem(m); 836 } else 837 IF_ENQUEUE(inq, m); 838 softint_schedule(pppoe_softintr); 839 return; 840 #endif /* NPPPOE > 0 */ 841 case ETHERTYPE_SLOWPROTOCOLS: { 842 uint8_t subtype; 843 844 #if defined(DIAGNOSTIC) 845 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 846 panic("ether_input: too short slow protocol packet"); 847 } 848 #endif 849 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 850 switch (subtype) { 851 #if NAGR > 0 852 case SLOWPROTOCOLS_SUBTYPE_LACP: 853 if (ifp->if_agrprivate) { 854 ieee8023ad_lacp_input(ifp, m); 855 return; 856 } 857 break; 858 859 case SLOWPROTOCOLS_SUBTYPE_MARKER: 860 if (ifp->if_agrprivate) { 861 ieee8023ad_marker_input(ifp, m); 862 return; 863 } 864 break; 865 #endif /* NAGR > 0 */ 866 default: 867 if (subtype == 0 || subtype > 10) { 868 /* illegal value */ 869 m_freem(m); 870 return; 871 } 872 /* unknown subtype */ 873 break; 874 } 875 /* FALLTHROUGH */ 876 } 877 default: 878 if (m->m_flags & M_PROMISC) { 879 m_freem(m); 880 return; 881 } 882 } 883 884 /* If the CRC is still on the packet, trim it off. */ 885 if (m->m_flags & M_HASFCS) { 886 m_adj(m, -ETHER_CRC_LEN); 887 m->m_flags &= ~M_HASFCS; 888 } 889 890 if (etype > ETHERMTU + sizeof (struct ether_header)) { 891 /* Strip off the Ethernet header. */ 892 m_adj(m, ehlen); 893 894 switch (etype) { 895 #ifdef INET 896 case ETHERTYPE_IP: 897 #ifdef GATEWAY 898 if (ipflow_fastforward(m)) 899 return; 900 #endif 901 schednetisr(NETISR_IP); 902 inq = &ipintrq; 903 break; 904 905 case ETHERTYPE_ARP: 906 schednetisr(NETISR_ARP); 907 inq = &arpintrq; 908 break; 909 910 case ETHERTYPE_REVARP: 911 revarpinput(m); /* XXX queue? */ 912 return; 913 #endif 914 #ifdef INET6 915 case ETHERTYPE_IPV6: 916 #ifdef GATEWAY 917 if (ip6flow_fastforward(m)) 918 return; 919 #endif 920 schednetisr(NETISR_IPV6); 921 inq = &ip6intrq; 922 break; 923 #endif 924 #ifdef IPX 925 case ETHERTYPE_IPX: 926 schednetisr(NETISR_IPX); 927 inq = &ipxintrq; 928 break; 929 #endif 930 #ifdef NETATALK 931 case ETHERTYPE_ATALK: 932 schednetisr(NETISR_ATALK); 933 inq = &atintrq1; 934 break; 935 case ETHERTYPE_AARP: 936 /* probably this should be done with a NETISR as well */ 937 aarpinput(ifp, m); /* XXX */ 938 return; 939 #endif /* NETATALK */ 940 #ifdef MPLS 941 case ETHERTYPE_MPLS: 942 schednetisr(NETISR_MPLS); 943 inq = &mplsintrq; 944 break; 945 #endif 946 default: 947 m_freem(m); 948 return; 949 } 950 } else { 951 #if defined (ISO) || defined (LLC) || defined (NETATALK) 952 l = (struct llc *)(eh+1); 953 switch (l->llc_dsap) { 954 #ifdef NETATALK 955 case LLC_SNAP_LSAP: 956 switch (l->llc_control) { 957 case LLC_UI: 958 if (l->llc_ssap != LLC_SNAP_LSAP) { 959 goto dropanyway; 960 } 961 962 if (memcmp(&(l->llc_snap_org_code)[0], 963 at_org_code, sizeof(at_org_code)) == 0 && 964 ntohs(l->llc_snap_ether_type) == 965 ETHERTYPE_ATALK) { 966 inq = &atintrq2; 967 m_adj(m, sizeof(struct ether_header) 968 + sizeof(struct llc)); 969 schednetisr(NETISR_ATALK); 970 break; 971 } 972 973 if (memcmp(&(l->llc_snap_org_code)[0], 974 aarp_org_code, 975 sizeof(aarp_org_code)) == 0 && 976 ntohs(l->llc_snap_ether_type) == 977 ETHERTYPE_AARP) { 978 m_adj( m, sizeof(struct ether_header) 979 + sizeof(struct llc)); 980 aarpinput(ifp, m); /* XXX */ 981 return; 982 } 983 984 default: 985 goto dropanyway; 986 } 987 break; 988 #endif /* NETATALK */ 989 #ifdef ISO 990 case LLC_ISO_LSAP: 991 switch (l->llc_control) { 992 case LLC_UI: 993 /* LLC_UI_P forbidden in class 1 service */ 994 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 995 (l->llc_ssap == LLC_ISO_LSAP)) { 996 /* LSAP for ISO */ 997 /* XXX length computation?? */ 998 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 999 m_adj(m, etype - m->m_pkthdr.len); 1000 1001 #ifdef ARGO_DEBUG 1002 if (argo_debug[D_ETHER]) 1003 printf("clnp packet"); 1004 #endif 1005 schednetisr(NETISR_ISO); 1006 inq = &clnlintrq; 1007 break; 1008 } 1009 goto dropanyway; 1010 1011 case LLC_XID: 1012 case LLC_XID_P: 1013 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 1014 /* XXX m_pullup? */ 1015 goto dropanyway; 1016 l->llc_window = 0; 1017 l->llc_fid = LLC_XID_FORMAT_BASIC; 1018 l->llc_class = LLC_XID_CLASS_I; 1019 l->llc_dsap = l->llc_ssap = 0; 1020 /* Fall through to */ 1021 case LLC_TEST: 1022 case LLC_TEST_P: 1023 { 1024 struct sockaddr sa; 1025 struct ether_header *eh2; 1026 int i; 1027 u_char c = l->llc_dsap; 1028 1029 l->llc_dsap = l->llc_ssap; 1030 l->llc_ssap = c; 1031 m_adj(m, sizeof(struct ether_header)); 1032 /* XXX we can optimize here? */ 1033 if (m->m_flags & (M_BCAST | M_MCAST)) 1034 memcpy(eh->ether_dhost, 1035 CLLADDR(ifp->if_sadl), 1036 ETHER_ADDR_LEN); 1037 sa.sa_family = AF_UNSPEC; 1038 sa.sa_len = sizeof(sa); 1039 eh2 = (struct ether_header *)sa.sa_data; 1040 for (i = 0; i < 6; i++) { 1041 eh2->ether_shost[i] = c = 1042 eh->ether_dhost[i]; 1043 eh2->ether_dhost[i] = 1044 eh->ether_dhost[i] = 1045 eh->ether_shost[i]; 1046 eh->ether_shost[i] = c; 1047 } 1048 ifp->if_output(ifp, m, &sa, NULL); 1049 return; 1050 } 1051 default: 1052 m_freem(m); 1053 return; 1054 } 1055 break; 1056 #endif /* ISO */ 1057 #if defined (ISO) || defined (NETATALK) 1058 dropanyway: 1059 #endif 1060 default: 1061 m_freem(m); 1062 return; 1063 } 1064 #else /* ISO || LLC || NETATALK*/ 1065 m_freem(m); 1066 return; 1067 #endif /* ISO || LLC || NETATALK*/ 1068 } 1069 1070 if (IF_QFULL(inq)) { 1071 IF_DROP(inq); 1072 m_freem(m); 1073 } else 1074 IF_ENQUEUE(inq, m); 1075 } 1076 1077 /* 1078 * Convert Ethernet address to printable (loggable) representation. 1079 */ 1080 char * 1081 ether_sprintf(const u_char *ap) 1082 { 1083 static char etherbuf[3 * ETHER_ADDR_LEN]; 1084 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1085 } 1086 1087 char * 1088 ether_snprintf(char *buf, size_t len, const u_char *ap) 1089 { 1090 char *cp = buf; 1091 size_t i; 1092 1093 for (i = 0; i < len / 3; i++) { 1094 *cp++ = hexdigits[*ap >> 4]; 1095 *cp++ = hexdigits[*ap++ & 0xf]; 1096 *cp++ = ':'; 1097 } 1098 *--cp = '\0'; 1099 return buf; 1100 } 1101 1102 /* 1103 * Perform common duties while attaching to interface list 1104 */ 1105 void 1106 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 1107 { 1108 struct ethercom *ec = (struct ethercom *)ifp; 1109 1110 ifp->if_type = IFT_ETHER; 1111 ifp->if_hdrlen = ETHER_HDR_LEN; 1112 ifp->if_dlt = DLT_EN10MB; 1113 ifp->if_mtu = ETHERMTU; 1114 ifp->if_output = ether_output; 1115 ifp->if_input = ether_input; 1116 if (ifp->if_baudrate == 0) 1117 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1118 1119 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1120 1121 LIST_INIT(&ec->ec_multiaddrs); 1122 ifp->if_broadcastaddr = etherbroadcastaddr; 1123 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1124 #ifdef MBUFTRACE 1125 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1126 sizeof(ec->ec_tx_mowner.mo_name)); 1127 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1128 sizeof(ec->ec_tx_mowner.mo_descr)); 1129 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1130 sizeof(ec->ec_rx_mowner.mo_name)); 1131 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1132 sizeof(ec->ec_rx_mowner.mo_descr)); 1133 MOWNER_ATTACH(&ec->ec_tx_mowner); 1134 MOWNER_ATTACH(&ec->ec_rx_mowner); 1135 ifp->if_mowner = &ec->ec_tx_mowner; 1136 #endif 1137 } 1138 1139 void 1140 ether_ifdetach(struct ifnet *ifp) 1141 { 1142 struct ethercom *ec = (void *) ifp; 1143 struct ether_multi *enm; 1144 int s; 1145 1146 #if NBRIDGE > 0 1147 if (ifp->if_bridge) 1148 bridge_ifdetach(ifp); 1149 #endif 1150 1151 bpf_detach(ifp); 1152 1153 #if NVLAN > 0 1154 if (ec->ec_nvlans) 1155 vlan_ifdetach(ifp); 1156 #endif 1157 1158 s = splnet(); 1159 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1160 LIST_REMOVE(enm, enm_list); 1161 free(enm, M_IFMADDR); 1162 ec->ec_multicnt--; 1163 } 1164 splx(s); 1165 1166 #if 0 /* done in if_detach() */ 1167 if_free_sadl(ifp); 1168 #endif 1169 1170 MOWNER_DETACH(&ec->ec_rx_mowner); 1171 MOWNER_DETACH(&ec->ec_tx_mowner); 1172 } 1173 1174 #if 0 1175 /* 1176 * This is for reference. We have a table-driven version 1177 * of the little-endian crc32 generator, which is faster 1178 * than the double-loop. 1179 */ 1180 uint32_t 1181 ether_crc32_le(const uint8_t *buf, size_t len) 1182 { 1183 uint32_t c, crc, carry; 1184 size_t i, j; 1185 1186 crc = 0xffffffffU; /* initial value */ 1187 1188 for (i = 0; i < len; i++) { 1189 c = buf[i]; 1190 for (j = 0; j < 8; j++) { 1191 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1192 crc >>= 1; 1193 c >>= 1; 1194 if (carry) 1195 crc = (crc ^ ETHER_CRC_POLY_LE); 1196 } 1197 } 1198 1199 return (crc); 1200 } 1201 #else 1202 uint32_t 1203 ether_crc32_le(const uint8_t *buf, size_t len) 1204 { 1205 static const uint32_t crctab[] = { 1206 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1207 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1208 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1209 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1210 }; 1211 uint32_t crc; 1212 size_t i; 1213 1214 crc = 0xffffffffU; /* initial value */ 1215 1216 for (i = 0; i < len; i++) { 1217 crc ^= buf[i]; 1218 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1219 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1220 } 1221 1222 return (crc); 1223 } 1224 #endif 1225 1226 uint32_t 1227 ether_crc32_be(const uint8_t *buf, size_t len) 1228 { 1229 uint32_t c, crc, carry; 1230 size_t i, j; 1231 1232 crc = 0xffffffffU; /* initial value */ 1233 1234 for (i = 0; i < len; i++) { 1235 c = buf[i]; 1236 for (j = 0; j < 8; j++) { 1237 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1238 crc <<= 1; 1239 c >>= 1; 1240 if (carry) 1241 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1242 } 1243 } 1244 1245 return (crc); 1246 } 1247 1248 #ifdef INET 1249 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1250 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1251 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1252 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1253 #endif 1254 #ifdef INET6 1255 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1256 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1257 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1258 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1259 #endif 1260 1261 /* 1262 * ether_aton implementation, not using a static buffer. 1263 */ 1264 int 1265 ether_aton_r(u_char *dest, size_t len, const char *str) 1266 { 1267 const u_char *cp = (const void *)str; 1268 u_char *ep; 1269 1270 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1271 1272 if (len < ETHER_ADDR_LEN) 1273 return ENOSPC; 1274 1275 ep = dest + ETHER_ADDR_LEN; 1276 1277 while (*cp) { 1278 if (!isxdigit(*cp)) 1279 return EINVAL; 1280 *dest = atox(*cp); 1281 cp++; 1282 if (isxdigit(*cp)) { 1283 *dest = (*dest << 4) | atox(*cp); 1284 dest++; 1285 cp++; 1286 } else 1287 dest++; 1288 if (dest == ep) 1289 return *cp == '\0' ? 0 : ENAMETOOLONG; 1290 switch (*cp) { 1291 case ':': 1292 case '-': 1293 case '.': 1294 cp++; 1295 break; 1296 } 1297 } 1298 return ENOBUFS; 1299 } 1300 1301 /* 1302 * Convert a sockaddr into an Ethernet address or range of Ethernet 1303 * addresses. 1304 */ 1305 int 1306 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1307 uint8_t addrhi[ETHER_ADDR_LEN]) 1308 { 1309 #ifdef INET 1310 const struct sockaddr_in *sin; 1311 #endif /* INET */ 1312 #ifdef INET6 1313 const struct sockaddr_in6 *sin6; 1314 #endif /* INET6 */ 1315 1316 switch (sa->sa_family) { 1317 1318 case AF_UNSPEC: 1319 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1320 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1321 break; 1322 1323 #ifdef INET 1324 case AF_INET: 1325 sin = satocsin(sa); 1326 if (sin->sin_addr.s_addr == INADDR_ANY) { 1327 /* 1328 * An IP address of INADDR_ANY means listen to 1329 * or stop listening to all of the Ethernet 1330 * multicast addresses used for IP. 1331 * (This is for the sake of IP multicast routers.) 1332 */ 1333 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1334 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1335 } 1336 else { 1337 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1338 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1339 } 1340 break; 1341 #endif 1342 #ifdef INET6 1343 case AF_INET6: 1344 sin6 = satocsin6(sa); 1345 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1346 /* 1347 * An IP6 address of 0 means listen to or stop 1348 * listening to all of the Ethernet multicast 1349 * address used for IP6. 1350 * (This is used for multicast routers.) 1351 */ 1352 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1353 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1354 } else { 1355 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1356 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1357 } 1358 break; 1359 #endif 1360 1361 default: 1362 return EAFNOSUPPORT; 1363 } 1364 return 0; 1365 } 1366 1367 /* 1368 * Add an Ethernet multicast address or range of addresses to the list for a 1369 * given interface. 1370 */ 1371 int 1372 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1373 { 1374 struct ether_multi *enm; 1375 u_char addrlo[ETHER_ADDR_LEN]; 1376 u_char addrhi[ETHER_ADDR_LEN]; 1377 int s = splnet(), error; 1378 1379 error = ether_multiaddr(sa, addrlo, addrhi); 1380 if (error != 0) { 1381 splx(s); 1382 return error; 1383 } 1384 1385 /* 1386 * Verify that we have valid Ethernet multicast addresses. 1387 */ 1388 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1389 splx(s); 1390 return EINVAL; 1391 } 1392 /* 1393 * See if the address range is already in the list. 1394 */ 1395 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1396 if (enm != NULL) { 1397 /* 1398 * Found it; just increment the reference count. 1399 */ 1400 ++enm->enm_refcount; 1401 splx(s); 1402 return 0; 1403 } 1404 /* 1405 * New address or range; malloc a new multicast record 1406 * and link it into the interface's multicast list. 1407 */ 1408 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1409 if (enm == NULL) { 1410 splx(s); 1411 return ENOBUFS; 1412 } 1413 memcpy(enm->enm_addrlo, addrlo, 6); 1414 memcpy(enm->enm_addrhi, addrhi, 6); 1415 enm->enm_refcount = 1; 1416 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1417 ec->ec_multicnt++; 1418 splx(s); 1419 /* 1420 * Return ENETRESET to inform the driver that the list has changed 1421 * and its reception filter should be adjusted accordingly. 1422 */ 1423 return ENETRESET; 1424 } 1425 1426 /* 1427 * Delete a multicast address record. 1428 */ 1429 int 1430 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1431 { 1432 struct ether_multi *enm; 1433 u_char addrlo[ETHER_ADDR_LEN]; 1434 u_char addrhi[ETHER_ADDR_LEN]; 1435 int s = splnet(), error; 1436 1437 error = ether_multiaddr(sa, addrlo, addrhi); 1438 if (error != 0) { 1439 splx(s); 1440 return (error); 1441 } 1442 1443 /* 1444 * Look ur the address in our list. 1445 */ 1446 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1447 if (enm == NULL) { 1448 splx(s); 1449 return (ENXIO); 1450 } 1451 if (--enm->enm_refcount != 0) { 1452 /* 1453 * Still some claims to this record. 1454 */ 1455 splx(s); 1456 return (0); 1457 } 1458 /* 1459 * No remaining claims to this record; unlink and free it. 1460 */ 1461 LIST_REMOVE(enm, enm_list); 1462 free(enm, M_IFMADDR); 1463 ec->ec_multicnt--; 1464 splx(s); 1465 /* 1466 * Return ENETRESET to inform the driver that the list has changed 1467 * and its reception filter should be adjusted accordingly. 1468 */ 1469 return (ENETRESET); 1470 } 1471 1472 void 1473 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1474 { 1475 ec->ec_ifflags_cb = cb; 1476 } 1477 1478 /* 1479 * Common ioctls for Ethernet interfaces. Note, we must be 1480 * called at splnet(). 1481 */ 1482 int 1483 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1484 { 1485 struct ethercom *ec = (void *) ifp; 1486 struct ifreq *ifr = (struct ifreq *)data; 1487 struct if_laddrreq *iflr = data; 1488 const struct sockaddr_dl *sdl; 1489 static const uint8_t zero[ETHER_ADDR_LEN]; 1490 int error; 1491 1492 switch (cmd) { 1493 case SIOCINITIFADDR: 1494 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1495 (IFF_UP|IFF_RUNNING)) { 1496 ifp->if_flags |= IFF_UP; 1497 if ((error = (*ifp->if_init)(ifp)) != 0) 1498 return error; 1499 } 1500 #ifdef INET 1501 { 1502 struct ifaddr *ifa = (struct ifaddr *)data; 1503 1504 if (ifa->ifa_addr->sa_family == AF_INET) 1505 arp_ifinit(ifp, ifa); 1506 } 1507 #endif /* INET */ 1508 return 0; 1509 1510 case SIOCSIFMTU: 1511 { 1512 int maxmtu; 1513 1514 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1515 maxmtu = ETHERMTU_JUMBO; 1516 else 1517 maxmtu = ETHERMTU; 1518 1519 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1520 return EINVAL; 1521 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1522 return error; 1523 else if (ifp->if_flags & IFF_UP) { 1524 /* Make sure the device notices the MTU change. */ 1525 return (*ifp->if_init)(ifp); 1526 } else 1527 return 0; 1528 } 1529 1530 case SIOCSIFFLAGS: 1531 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1532 return error; 1533 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1534 case IFF_RUNNING: 1535 /* 1536 * If interface is marked down and it is running, 1537 * then stop and disable it. 1538 */ 1539 (*ifp->if_stop)(ifp, 1); 1540 break; 1541 case IFF_UP: 1542 /* 1543 * If interface is marked up and it is stopped, then 1544 * start it. 1545 */ 1546 return (*ifp->if_init)(ifp); 1547 case IFF_UP|IFF_RUNNING: 1548 error = 0; 1549 if (ec->ec_ifflags_cb == NULL || 1550 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1551 /* 1552 * Reset the interface to pick up 1553 * changes in any other flags that 1554 * affect the hardware state. 1555 */ 1556 return (*ifp->if_init)(ifp); 1557 } else 1558 return error; 1559 case 0: 1560 break; 1561 } 1562 return 0; 1563 case SIOCADDMULTI: 1564 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1565 case SIOCDELMULTI: 1566 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1567 case SIOCSIFMEDIA: 1568 case SIOCGIFMEDIA: 1569 if (ec->ec_mii == NULL) 1570 return ENOTTY; 1571 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1572 case SIOCALIFADDR: 1573 sdl = satocsdl(sstocsa(&iflr->addr)); 1574 if (sdl->sdl_family != AF_LINK) 1575 ; 1576 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1577 return EINVAL; 1578 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1579 return EINVAL; 1580 /*FALLTHROUGH*/ 1581 default: 1582 return ifioctl_common(ifp, cmd, data); 1583 } 1584 return 0; 1585 } 1586
Indexes created Tue Sep 30 07:10:03 GMT 2025