if_ethersubr.c revision 1.188.8.5
1 /* $NetBSD: if_ethersubr.c,v 1.188.8.5 2017/02/05 05:48:00 snj 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 1.188.8.5 2017/02/05 05:48:00 snj 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 KASSERT(KERNEL_LOCKED_P()); 226 227 #ifdef MBUFTRACE 228 m_claimm(m, ifp->if_mowner); 229 #endif 230 231 #if NCARP > 0 232 if (ifp->if_type == IFT_CARP) { 233 struct ifaddr *ifa; 234 235 /* loop back if this is going to the carp interface */ 236 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 237 (ifa = ifa_ifwithaddr(dst)) != NULL && 238 ifa->ifa_ifp == ifp0) 239 return looutput(ifp0, m, dst, rt0); 240 241 ifp = ifp->if_carpdev; 242 /* ac = (struct arpcom *)ifp; */ 243 244 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 245 (IFF_UP|IFF_RUNNING)) 246 senderr(ENETDOWN); 247 } 248 #endif /* NCARP > 0 */ 249 250 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 251 senderr(ENETDOWN); 252 if ((rt = rt0) != NULL) { 253 if ((rt->rt_flags & RTF_UP) == 0) { 254 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 255 rt->rt_refcnt--; 256 if (rt->rt_ifp != ifp) 257 return (*rt->rt_ifp->if_output) 258 (ifp, m0, dst, rt); 259 } else 260 senderr(EHOSTUNREACH); 261 } 262 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 263 if (rt->rt_gwroute == NULL) 264 goto lookup; 265 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 266 rtfree(rt); rt = rt0; 267 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 268 if ((rt = rt->rt_gwroute) == NULL) 269 senderr(EHOSTUNREACH); 270 /* the "G" test below also prevents rt == rt0 */ 271 if ((rt->rt_flags & RTF_GATEWAY) || 272 (rt->rt_ifp != ifp)) { 273 rt->rt_refcnt--; 274 rt0->rt_gwroute = NULL; 275 senderr(EHOSTUNREACH); 276 } 277 } 278 } 279 if (rt->rt_flags & RTF_REJECT) 280 if (rt->rt_rmx.rmx_expire == 0 || 281 (u_long) time_second < rt->rt_rmx.rmx_expire) 282 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 283 } 284 285 switch (dst->sa_family) { 286 287 #ifdef INET 288 case AF_INET: 289 if (m->m_flags & M_BCAST) 290 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 291 else if (m->m_flags & M_MCAST) 292 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 293 else if (!arpresolve(ifp, rt, m, dst, edst)) 294 return (0); /* if not yet resolved */ 295 /* If broadcasting on a simplex interface, loopback a copy */ 296 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 297 mcopy = m_copy(m, 0, (int)M_COPYALL); 298 etype = htons(ETHERTYPE_IP); 299 break; 300 301 case AF_ARP: 302 ah = mtod(m, struct arphdr *); 303 if (m->m_flags & M_BCAST) 304 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 305 else { 306 void *tha = ar_tha(ah); 307 308 if (tha == NULL) { 309 /* fake with ARPHDR_IEEE1394 */ 310 m_freem(m); 311 return 0; 312 } 313 memcpy(edst, tha, sizeof(edst)); 314 } 315 316 ah->ar_hrd = htons(ARPHRD_ETHER); 317 318 switch (ntohs(ah->ar_op)) { 319 case ARPOP_REVREQUEST: 320 case ARPOP_REVREPLY: 321 etype = htons(ETHERTYPE_REVARP); 322 break; 323 324 case ARPOP_REQUEST: 325 case ARPOP_REPLY: 326 default: 327 etype = htons(ETHERTYPE_ARP); 328 } 329 330 break; 331 #endif 332 #ifdef INET6 333 case AF_INET6: 334 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ 335 /* something bad happened */ 336 return (0); 337 } 338 etype = htons(ETHERTYPE_IPV6); 339 break; 340 #endif 341 #ifdef NETATALK 342 case AF_APPLETALK: 343 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 344 #ifdef NETATALKDEBUG 345 printf("aarpresolv failed\n"); 346 #endif /* NETATALKDEBUG */ 347 return (0); 348 } 349 /* 350 * ifaddr is the first thing in at_ifaddr 351 */ 352 aa = (struct at_ifaddr *) at_ifawithnet( 353 (const struct sockaddr_at *)dst, ifp); 354 if (aa == NULL) 355 goto bad; 356 357 /* 358 * In the phase 2 case, we need to prepend an mbuf for the 359 * llc header. Since we must preserve the value of m, 360 * which is passed to us by value, we m_copy() the first 361 * mbuf, and use it for our llc header. 362 */ 363 if (aa->aa_flags & AFA_PHASE2) { 364 struct llc llc; 365 366 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 367 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 368 llc.llc_control = LLC_UI; 369 memcpy(llc.llc_snap_org_code, at_org_code, 370 sizeof(llc.llc_snap_org_code)); 371 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 372 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 373 } else { 374 etype = htons(ETHERTYPE_ATALK); 375 } 376 break; 377 #endif /* NETATALK */ 378 #ifdef IPX 379 case AF_IPX: 380 etype = htons(ETHERTYPE_IPX); 381 memcpy(edst, 382 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 383 sizeof(edst)); 384 /* If broadcasting on a simplex interface, loopback a copy */ 385 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 386 mcopy = m_copy(m, 0, (int)M_COPYALL); 387 break; 388 #endif 389 #ifdef ISO 390 case AF_ISO: { 391 int snpalen; 392 struct llc *l; 393 const struct sockaddr_dl *sdl; 394 395 if (rt && (sdl = satocsdl(rt->rt_gateway)) && 396 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 397 memcpy(edst, CLLADDR(sdl), sizeof(edst)); 398 } else { 399 error = iso_snparesolve(ifp, 400 (const struct sockaddr_iso *)dst, 401 (char *)edst, &snpalen); 402 if (error) 403 goto bad; /* Not Resolved */ 404 } 405 /* If broadcasting on a simplex interface, loopback a copy */ 406 if (*edst & 1) 407 m->m_flags |= (M_BCAST|M_MCAST); 408 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 409 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 410 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 411 if (mcopy) { 412 eh = mtod(mcopy, struct ether_header *); 413 memcpy(eh->ether_dhost, edst, sizeof(edst)); 414 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 415 sizeof(edst)); 416 } 417 } 418 M_PREPEND(m, 3, M_DONTWAIT); 419 if (m == NULL) 420 return (0); 421 l = mtod(m, struct llc *); 422 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 423 l->llc_control = LLC_UI; 424 #ifdef ARGO_DEBUG 425 if (argo_debug[D_ETHER]) { 426 int i; 427 printf("unoutput: sending pkt to: "); 428 for (i=0; i<6; i++) 429 printf("%x ", edst[i] & 0xff); 430 printf("\n"); 431 } 432 #endif 433 } break; 434 #endif /* ISO */ 435 436 case pseudo_AF_HDRCMPLT: 437 hdrcmplt = 1; 438 memcpy(esrc, 439 ((const struct ether_header *)dst->sa_data)->ether_shost, 440 sizeof(esrc)); 441 /* FALLTHROUGH */ 442 443 case AF_UNSPEC: 444 memcpy(edst, 445 ((const struct ether_header *)dst->sa_data)->ether_dhost, 446 sizeof(edst)); 447 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 448 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 449 break; 450 451 default: 452 printf("%s: can't handle af%d\n", ifp->if_xname, 453 dst->sa_family); 454 senderr(EAFNOSUPPORT); 455 } 456 457 #ifdef MPLS 458 if (rt0 != NULL && rt_gettag(rt0) != NULL && 459 rt_gettag(rt0)->sa_family == AF_MPLS && 460 (m->m_flags & (M_MCAST | M_BCAST)) == 0) { 461 union mpls_shim msh; 462 msh.s_addr = MPLS_GETSADDR(rt0); 463 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 464 etype = htons(ETHERTYPE_MPLS); 465 } 466 #endif 467 468 if (mcopy) 469 (void)looutput(ifp, mcopy, dst, rt); 470 471 /* If no ether type is set, this must be a 802.2 formatted packet. 472 */ 473 if (etype == 0) 474 etype = htons(m->m_pkthdr.len); 475 /* 476 * Add local net header. If no space in first mbuf, 477 * allocate another. 478 */ 479 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 480 if (m == 0) 481 senderr(ENOBUFS); 482 eh = mtod(m, struct ether_header *); 483 /* Note: etype is already in network byte order. */ 484 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 485 memcpy(eh->ether_dhost, edst, sizeof(edst)); 486 if (hdrcmplt) 487 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 488 else 489 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 490 sizeof(eh->ether_shost)); 491 492 #if NCARP > 0 493 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 494 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 495 sizeof(eh->ether_shost)); 496 } 497 #endif /* NCARP > 0 */ 498 499 #ifdef PFIL_HOOKS 500 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 501 return (error); 502 if (m == NULL) 503 return (0); 504 #endif 505 506 #if NBRIDGE > 0 507 /* 508 * Bridges require special output handling. 509 */ 510 if (ifp->if_bridge) 511 return (bridge_output(ifp, m, NULL, NULL)); 512 #endif 513 514 #if NCARP > 0 515 if (ifp != ifp0) 516 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 517 #endif /* NCARP > 0 */ 518 519 #ifdef ALTQ 520 /* 521 * If ALTQ is enabled on the parent interface, do 522 * classification; the queueing discipline might not 523 * require classification, but might require the 524 * address family/header pointer in the pktattr. 525 */ 526 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 527 altq_etherclassify(&ifp->if_snd, m, &pktattr); 528 #endif 529 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 530 531 bad: 532 if (m) 533 m_freem(m); 534 return (error); 535 } 536 537 #ifdef ALTQ 538 /* 539 * This routine is a slight hack to allow a packet to be classified 540 * if the Ethernet headers are present. It will go away when ALTQ's 541 * classification engine understands link headers. 542 */ 543 void 544 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 545 struct altq_pktattr *pktattr) 546 { 547 struct ether_header *eh; 548 uint16_t ether_type; 549 int hlen, af, hdrsize; 550 void *hdr; 551 552 hlen = ETHER_HDR_LEN; 553 eh = mtod(m, struct ether_header *); 554 555 ether_type = htons(eh->ether_type); 556 557 if (ether_type < ETHERMTU) { 558 /* LLC/SNAP */ 559 struct llc *llc = (struct llc *)(eh + 1); 560 hlen += 8; 561 562 if (m->m_len < hlen || 563 llc->llc_dsap != LLC_SNAP_LSAP || 564 llc->llc_ssap != LLC_SNAP_LSAP || 565 llc->llc_control != LLC_UI) { 566 /* Not SNAP. */ 567 goto bad; 568 } 569 570 ether_type = htons(llc->llc_un.type_snap.ether_type); 571 } 572 573 switch (ether_type) { 574 case ETHERTYPE_IP: 575 af = AF_INET; 576 hdrsize = 20; /* sizeof(struct ip) */ 577 break; 578 579 case ETHERTYPE_IPV6: 580 af = AF_INET6; 581 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 582 break; 583 584 default: 585 af = AF_UNSPEC; 586 hdrsize = 0; 587 break; 588 } 589 590 while (m->m_len <= hlen) { 591 hlen -= m->m_len; 592 m = m->m_next; 593 } 594 if (m->m_len < (hlen + hdrsize)) { 595 /* 596 * protocol header not in a single mbuf. 597 * We can't cope with this situation right 598 * now (but it shouldn't ever happen, really, anyhow). 599 */ 600 #ifdef DEBUG 601 printf("altq_etherclassify: headers span multiple mbufs: " 602 "%d < %d\n", m->m_len, (hlen + hdrsize)); 603 #endif 604 goto bad; 605 } 606 607 m->m_data += hlen; 608 m->m_len -= hlen; 609 610 hdr = mtod(m, void *); 611 612 if (ALTQ_NEEDS_CLASSIFY(ifq)) 613 pktattr->pattr_class = 614 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 615 pktattr->pattr_af = af; 616 pktattr->pattr_hdr = hdr; 617 618 m->m_data -= hlen; 619 m->m_len += hlen; 620 621 return; 622 623 bad: 624 pktattr->pattr_class = NULL; 625 pktattr->pattr_hdr = NULL; 626 pktattr->pattr_af = AF_UNSPEC; 627 } 628 #endif /* ALTQ */ 629 630 /* 631 * Process a received Ethernet packet; 632 * the packet is in the mbuf chain m with 633 * the ether header. 634 */ 635 void 636 ether_input(struct ifnet *ifp, struct mbuf *m) 637 { 638 struct ethercom *ec = (struct ethercom *) ifp; 639 struct ifqueue *inq; 640 uint16_t etype; 641 struct ether_header *eh; 642 size_t ehlen; 643 #if defined (ISO) || defined (LLC) || defined(NETATALK) 644 struct llc *l; 645 #endif 646 647 if ((ifp->if_flags & IFF_UP) == 0) { 648 m_freem(m); 649 return; 650 } 651 652 #ifdef MBUFTRACE 653 m_claimm(m, &ec->ec_rx_mowner); 654 #endif 655 eh = mtod(m, struct ether_header *); 656 etype = ntohs(eh->ether_type); 657 ehlen = sizeof(*eh); 658 659 /* 660 * Determine if the packet is within its size limits. 661 */ 662 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 663 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 664 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 665 bigpktppslim)) { 666 printf("%s: discarding oversize frame (len=%d)\n", 667 ifp->if_xname, m->m_pkthdr.len); 668 } 669 m_freem(m); 670 return; 671 } 672 673 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 674 /* 675 * If this is not a simplex interface, drop the packet 676 * if it came from us. 677 */ 678 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 679 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 680 ETHER_ADDR_LEN) == 0) { 681 m_freem(m); 682 return; 683 } 684 685 if (memcmp(etherbroadcastaddr, 686 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 687 m->m_flags |= M_BCAST; 688 else 689 m->m_flags |= M_MCAST; 690 ifp->if_imcasts++; 691 } 692 693 /* If the CRC is still on the packet, trim it off. */ 694 if (m->m_flags & M_HASFCS) { 695 m_adj(m, -ETHER_CRC_LEN); 696 m->m_flags &= ~M_HASFCS; 697 } 698 699 ifp->if_ibytes += m->m_pkthdr.len; 700 701 #if NBRIDGE > 0 702 /* 703 * Tap the packet off here for a bridge. bridge_input() 704 * will return NULL if it has consumed the packet, otherwise 705 * it gets processed as normal. Note that bridge_input() 706 * will always return the original packet if we need to 707 * process it locally. 708 */ 709 if (ifp->if_bridge) { 710 /* clear M_PROMISC, in case the packets comes from a vlan */ 711 m->m_flags &= ~M_PROMISC; 712 m = bridge_input(ifp, m); 713 if (m == NULL) 714 return; 715 716 /* 717 * Bridge has determined that the packet is for us. 718 * Update our interface pointer -- we may have had 719 * to "bridge" the packet locally. 720 */ 721 ifp = m->m_pkthdr.rcvif; 722 } else 723 #endif /* NBRIDGE > 0 */ 724 { 725 726 #if NCARP > 0 727 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 728 /* 729 * clear M_PROMISC, in case the packets comes from a 730 * vlan 731 */ 732 m->m_flags &= ~M_PROMISC; 733 if (carp_input(m, (uint8_t *)&eh->ether_shost, 734 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 735 return; 736 } 737 #endif /* NCARP > 0 */ 738 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 739 (ifp->if_flags & IFF_PROMISC) != 0 && 740 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 741 ETHER_ADDR_LEN) != 0) { 742 m->m_flags |= M_PROMISC; 743 } 744 } 745 746 #ifdef PFIL_HOOKS 747 if ((m->m_flags & M_PROMISC) == 0) { 748 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 749 return; 750 if (m == NULL) 751 return; 752 753 eh = mtod(m, struct ether_header *); 754 etype = ntohs(eh->ether_type); 755 ehlen = sizeof(*eh); 756 } 757 #endif 758 759 #if NAGR > 0 760 if (ifp->if_agrprivate && 761 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 762 m->m_flags &= ~M_PROMISC; 763 agr_input(ifp, m); 764 return; 765 } 766 #endif /* NAGR > 0 */ 767 768 /* 769 * If VLANs are configured on the interface, check to 770 * see if the device performed the decapsulation and 771 * provided us with the tag. 772 */ 773 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 774 #if NVLAN > 0 775 /* 776 * vlan_input() will either recursively call ether_input() 777 * or drop the packet. 778 */ 779 vlan_input(ifp, m); 780 #else 781 m_freem(m); 782 #endif 783 return; 784 } 785 786 /* 787 * Handle protocols that expect to have the Ethernet header 788 * (and possibly FCS) intact. 789 */ 790 switch (etype) { 791 case ETHERTYPE_VLAN: { 792 struct ether_vlan_header *evl = (void *)eh; 793 /* 794 * If there is a tag of 0, then the VLAN header was probably 795 * just being used to store the priority. Extract the ether 796 * type, and if IP or IPV6, let them deal with it. 797 */ 798 if (m->m_len <= sizeof(*evl) 799 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 800 etype = ntohs(evl->evl_proto); 801 ehlen = sizeof(*evl); 802 if ((m->m_flags & M_PROMISC) == 0 803 && (etype == ETHERTYPE_IP 804 || etype == ETHERTYPE_IPV6)) 805 break; 806 } 807 #if NVLAN > 0 808 /* 809 * vlan_input() will either recursively call ether_input() 810 * or drop the packet. 811 */ 812 if (((struct ethercom *)ifp)->ec_nvlans != 0) 813 vlan_input(ifp, m); 814 else 815 #endif /* NVLAN > 0 */ 816 m_freem(m); 817 return; 818 } 819 #if NPPPOE > 0 820 case ETHERTYPE_PPPOEDISC: 821 case ETHERTYPE_PPPOE: 822 if (m->m_flags & M_PROMISC) { 823 m_freem(m); 824 return; 825 } 826 #ifndef PPPOE_SERVER 827 if (m->m_flags & (M_MCAST | M_BCAST)) { 828 m_freem(m); 829 return; 830 } 831 #endif 832 833 if (etype == ETHERTYPE_PPPOEDISC) 834 inq = &ppoediscinq; 835 else 836 inq = &ppoeinq; 837 if (IF_QFULL(inq)) { 838 IF_DROP(inq); 839 m_freem(m); 840 } else 841 IF_ENQUEUE(inq, m); 842 softint_schedule(pppoe_softintr); 843 return; 844 #endif /* NPPPOE > 0 */ 845 case ETHERTYPE_SLOWPROTOCOLS: { 846 uint8_t subtype; 847 848 #if defined(DIAGNOSTIC) 849 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 850 panic("ether_input: too short slow protocol packet"); 851 } 852 #endif 853 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 854 switch (subtype) { 855 #if NAGR > 0 856 case SLOWPROTOCOLS_SUBTYPE_LACP: 857 if (ifp->if_agrprivate) { 858 ieee8023ad_lacp_input(ifp, m); 859 return; 860 } 861 break; 862 863 case SLOWPROTOCOLS_SUBTYPE_MARKER: 864 if (ifp->if_agrprivate) { 865 ieee8023ad_marker_input(ifp, m); 866 return; 867 } 868 break; 869 #endif /* NAGR > 0 */ 870 default: 871 if (subtype == 0 || subtype > 10) { 872 /* illegal value */ 873 m_freem(m); 874 return; 875 } 876 /* unknown subtype */ 877 break; 878 } 879 /* FALLTHROUGH */ 880 } 881 default: 882 if (m->m_flags & M_PROMISC) { 883 m_freem(m); 884 return; 885 } 886 } 887 888 /* If the CRC is still on the packet, trim it off. */ 889 if (m->m_flags & M_HASFCS) { 890 m_adj(m, -ETHER_CRC_LEN); 891 m->m_flags &= ~M_HASFCS; 892 } 893 894 if (etype > ETHERMTU + sizeof (struct ether_header)) { 895 /* Strip off the Ethernet header. */ 896 m_adj(m, ehlen); 897 898 switch (etype) { 899 #ifdef INET 900 case ETHERTYPE_IP: 901 #ifdef GATEWAY 902 if (ipflow_fastforward(m)) 903 return; 904 #endif 905 schednetisr(NETISR_IP); 906 inq = &ipintrq; 907 break; 908 909 case ETHERTYPE_ARP: 910 schednetisr(NETISR_ARP); 911 inq = &arpintrq; 912 break; 913 914 case ETHERTYPE_REVARP: 915 revarpinput(m); /* XXX queue? */ 916 return; 917 #endif 918 #ifdef INET6 919 case ETHERTYPE_IPV6: 920 #ifdef GATEWAY 921 if (ip6flow_fastforward(&m)) 922 return; 923 #endif 924 schednetisr(NETISR_IPV6); 925 inq = &ip6intrq; 926 break; 927 #endif 928 #ifdef IPX 929 case ETHERTYPE_IPX: 930 schednetisr(NETISR_IPX); 931 inq = &ipxintrq; 932 break; 933 #endif 934 #ifdef NETATALK 935 case ETHERTYPE_ATALK: 936 schednetisr(NETISR_ATALK); 937 inq = &atintrq1; 938 break; 939 case ETHERTYPE_AARP: 940 /* probably this should be done with a NETISR as well */ 941 aarpinput(ifp, m); /* XXX */ 942 return; 943 #endif /* NETATALK */ 944 #ifdef MPLS 945 case ETHERTYPE_MPLS: 946 schednetisr(NETISR_MPLS); 947 inq = &mplsintrq; 948 break; 949 #endif 950 default: 951 m_freem(m); 952 return; 953 } 954 } else { 955 #if defined (ISO) || defined (LLC) || defined (NETATALK) 956 l = (struct llc *)(eh+1); 957 switch (l->llc_dsap) { 958 #ifdef NETATALK 959 case LLC_SNAP_LSAP: 960 switch (l->llc_control) { 961 case LLC_UI: 962 if (l->llc_ssap != LLC_SNAP_LSAP) { 963 goto dropanyway; 964 } 965 966 if (memcmp(&(l->llc_snap_org_code)[0], 967 at_org_code, sizeof(at_org_code)) == 0 && 968 ntohs(l->llc_snap_ether_type) == 969 ETHERTYPE_ATALK) { 970 inq = &atintrq2; 971 m_adj(m, sizeof(struct ether_header) 972 + sizeof(struct llc)); 973 schednetisr(NETISR_ATALK); 974 break; 975 } 976 977 if (memcmp(&(l->llc_snap_org_code)[0], 978 aarp_org_code, 979 sizeof(aarp_org_code)) == 0 && 980 ntohs(l->llc_snap_ether_type) == 981 ETHERTYPE_AARP) { 982 m_adj( m, sizeof(struct ether_header) 983 + sizeof(struct llc)); 984 aarpinput(ifp, m); /* XXX */ 985 return; 986 } 987 988 default: 989 goto dropanyway; 990 } 991 break; 992 #endif /* NETATALK */ 993 #ifdef ISO 994 case LLC_ISO_LSAP: 995 switch (l->llc_control) { 996 case LLC_UI: 997 /* LLC_UI_P forbidden in class 1 service */ 998 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 999 (l->llc_ssap == LLC_ISO_LSAP)) { 1000 /* LSAP for ISO */ 1001 /* XXX length computation?? */ 1002 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 1003 m_adj(m, etype - m->m_pkthdr.len); 1004 1005 #ifdef ARGO_DEBUG 1006 if (argo_debug[D_ETHER]) 1007 printf("clnp packet"); 1008 #endif 1009 schednetisr(NETISR_ISO); 1010 inq = &clnlintrq; 1011 break; 1012 } 1013 goto dropanyway; 1014 1015 case LLC_XID: 1016 case LLC_XID_P: 1017 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 1018 /* XXX m_pullup? */ 1019 goto dropanyway; 1020 l->llc_window = 0; 1021 l->llc_fid = LLC_XID_FORMAT_BASIC; 1022 l->llc_class = LLC_XID_CLASS_I; 1023 l->llc_dsap = l->llc_ssap = 0; 1024 /* Fall through to */ 1025 case LLC_TEST: 1026 case LLC_TEST_P: 1027 { 1028 struct sockaddr sa; 1029 struct ether_header *eh2; 1030 int i; 1031 u_char c = l->llc_dsap; 1032 1033 l->llc_dsap = l->llc_ssap; 1034 l->llc_ssap = c; 1035 m_adj(m, sizeof(struct ether_header)); 1036 /* XXX we can optimize here? */ 1037 if (m->m_flags & (M_BCAST | M_MCAST)) 1038 memcpy(eh->ether_dhost, 1039 CLLADDR(ifp->if_sadl), 1040 ETHER_ADDR_LEN); 1041 sa.sa_family = AF_UNSPEC; 1042 sa.sa_len = sizeof(sa); 1043 eh2 = (struct ether_header *)sa.sa_data; 1044 for (i = 0; i < 6; i++) { 1045 eh2->ether_shost[i] = c = 1046 eh->ether_dhost[i]; 1047 eh2->ether_dhost[i] = 1048 eh->ether_dhost[i] = 1049 eh->ether_shost[i]; 1050 eh->ether_shost[i] = c; 1051 } 1052 ifp->if_output(ifp, m, &sa, NULL); 1053 return; 1054 } 1055 default: 1056 m_freem(m); 1057 return; 1058 } 1059 break; 1060 #endif /* ISO */ 1061 #if defined (ISO) || defined (NETATALK) 1062 dropanyway: 1063 #endif 1064 default: 1065 m_freem(m); 1066 return; 1067 } 1068 #else /* ISO || LLC || NETATALK*/ 1069 m_freem(m); 1070 return; 1071 #endif /* ISO || LLC || NETATALK*/ 1072 } 1073 1074 if (IF_QFULL(inq)) { 1075 IF_DROP(inq); 1076 m_freem(m); 1077 } else 1078 IF_ENQUEUE(inq, m); 1079 } 1080 1081 /* 1082 * Convert Ethernet address to printable (loggable) representation. 1083 */ 1084 char * 1085 ether_sprintf(const u_char *ap) 1086 { 1087 static char etherbuf[3 * ETHER_ADDR_LEN]; 1088 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1089 } 1090 1091 char * 1092 ether_snprintf(char *buf, size_t len, const u_char *ap) 1093 { 1094 char *cp = buf; 1095 size_t i; 1096 1097 for (i = 0; i < len / 3; i++) { 1098 *cp++ = hexdigits[*ap >> 4]; 1099 *cp++ = hexdigits[*ap++ & 0xf]; 1100 *cp++ = ':'; 1101 } 1102 *--cp = '\0'; 1103 return buf; 1104 } 1105 1106 /* 1107 * Perform common duties while attaching to interface list 1108 */ 1109 void 1110 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 1111 { 1112 struct ethercom *ec = (struct ethercom *)ifp; 1113 1114 ifp->if_type = IFT_ETHER; 1115 ifp->if_hdrlen = ETHER_HDR_LEN; 1116 ifp->if_dlt = DLT_EN10MB; 1117 ifp->if_mtu = ETHERMTU; 1118 ifp->if_output = ether_output; 1119 ifp->if_input = ether_input; 1120 if (ifp->if_baudrate == 0) 1121 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1122 1123 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1124 1125 LIST_INIT(&ec->ec_multiaddrs); 1126 ifp->if_broadcastaddr = etherbroadcastaddr; 1127 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1128 #ifdef MBUFTRACE 1129 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1130 sizeof(ec->ec_tx_mowner.mo_name)); 1131 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1132 sizeof(ec->ec_tx_mowner.mo_descr)); 1133 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1134 sizeof(ec->ec_rx_mowner.mo_name)); 1135 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1136 sizeof(ec->ec_rx_mowner.mo_descr)); 1137 MOWNER_ATTACH(&ec->ec_tx_mowner); 1138 MOWNER_ATTACH(&ec->ec_rx_mowner); 1139 ifp->if_mowner = &ec->ec_tx_mowner; 1140 #endif 1141 } 1142 1143 void 1144 ether_ifdetach(struct ifnet *ifp) 1145 { 1146 struct ethercom *ec = (void *) ifp; 1147 struct ether_multi *enm; 1148 int s; 1149 1150 /* 1151 * Prevent further calls to ioctl (for example turning off 1152 * promiscuous mode from the bridge code), which eventually can 1153 * call if_init() which can cause panics because the interface 1154 * is in the process of being detached. Return device not configured 1155 * instead. 1156 */ 1157 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1158 1159 #if NBRIDGE > 0 1160 if (ifp->if_bridge) 1161 bridge_ifdetach(ifp); 1162 #endif 1163 1164 bpf_detach(ifp); 1165 1166 #if NVLAN > 0 1167 if (ec->ec_nvlans) 1168 vlan_ifdetach(ifp); 1169 #endif 1170 1171 s = splnet(); 1172 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1173 LIST_REMOVE(enm, enm_list); 1174 free(enm, M_IFMADDR); 1175 ec->ec_multicnt--; 1176 } 1177 splx(s); 1178 1179 #if 0 /* done in if_detach() */ 1180 if_free_sadl(ifp); 1181 #endif 1182 1183 ifp->if_mowner = NULL; 1184 MOWNER_DETACH(&ec->ec_rx_mowner); 1185 MOWNER_DETACH(&ec->ec_tx_mowner); 1186 } 1187 1188 #if 0 1189 /* 1190 * This is for reference. We have a table-driven version 1191 * of the little-endian crc32 generator, which is faster 1192 * than the double-loop. 1193 */ 1194 uint32_t 1195 ether_crc32_le(const uint8_t *buf, size_t len) 1196 { 1197 uint32_t c, crc, carry; 1198 size_t i, j; 1199 1200 crc = 0xffffffffU; /* initial value */ 1201 1202 for (i = 0; i < len; i++) { 1203 c = buf[i]; 1204 for (j = 0; j < 8; j++) { 1205 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1206 crc >>= 1; 1207 c >>= 1; 1208 if (carry) 1209 crc = (crc ^ ETHER_CRC_POLY_LE); 1210 } 1211 } 1212 1213 return (crc); 1214 } 1215 #else 1216 uint32_t 1217 ether_crc32_le(const uint8_t *buf, size_t len) 1218 { 1219 static const uint32_t crctab[] = { 1220 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1221 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1222 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1223 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1224 }; 1225 uint32_t crc; 1226 size_t i; 1227 1228 crc = 0xffffffffU; /* initial value */ 1229 1230 for (i = 0; i < len; i++) { 1231 crc ^= buf[i]; 1232 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1233 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1234 } 1235 1236 return (crc); 1237 } 1238 #endif 1239 1240 uint32_t 1241 ether_crc32_be(const uint8_t *buf, size_t len) 1242 { 1243 uint32_t c, crc, carry; 1244 size_t i, j; 1245 1246 crc = 0xffffffffU; /* initial value */ 1247 1248 for (i = 0; i < len; i++) { 1249 c = buf[i]; 1250 for (j = 0; j < 8; j++) { 1251 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1252 crc <<= 1; 1253 c >>= 1; 1254 if (carry) 1255 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1256 } 1257 } 1258 1259 return (crc); 1260 } 1261 1262 #ifdef INET 1263 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1264 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1265 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1266 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1267 #endif 1268 #ifdef INET6 1269 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1270 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1271 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1272 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1273 #endif 1274 1275 /* 1276 * ether_aton implementation, not using a static buffer. 1277 */ 1278 int 1279 ether_aton_r(u_char *dest, size_t len, const char *str) 1280 { 1281 const u_char *cp = (const void *)str; 1282 u_char *ep; 1283 1284 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1285 1286 if (len < ETHER_ADDR_LEN) 1287 return ENOSPC; 1288 1289 ep = dest + ETHER_ADDR_LEN; 1290 1291 while (*cp) { 1292 if (!isxdigit(*cp)) 1293 return EINVAL; 1294 *dest = atox(*cp); 1295 cp++; 1296 if (isxdigit(*cp)) { 1297 *dest = (*dest << 4) | atox(*cp); 1298 dest++; 1299 cp++; 1300 } else 1301 dest++; 1302 if (dest == ep) 1303 return *cp == '\0' ? 0 : ENAMETOOLONG; 1304 switch (*cp) { 1305 case ':': 1306 case '-': 1307 case '.': 1308 cp++; 1309 break; 1310 } 1311 } 1312 return ENOBUFS; 1313 } 1314 1315 /* 1316 * Convert a sockaddr into an Ethernet address or range of Ethernet 1317 * addresses. 1318 */ 1319 int 1320 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1321 uint8_t addrhi[ETHER_ADDR_LEN]) 1322 { 1323 #ifdef INET 1324 const struct sockaddr_in *sin; 1325 #endif /* INET */ 1326 #ifdef INET6 1327 const struct sockaddr_in6 *sin6; 1328 #endif /* INET6 */ 1329 1330 switch (sa->sa_family) { 1331 1332 case AF_UNSPEC: 1333 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1334 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1335 break; 1336 1337 #ifdef INET 1338 case AF_INET: 1339 sin = satocsin(sa); 1340 if (sin->sin_addr.s_addr == INADDR_ANY) { 1341 /* 1342 * An IP address of INADDR_ANY means listen to 1343 * or stop listening to all of the Ethernet 1344 * multicast addresses used for IP. 1345 * (This is for the sake of IP multicast routers.) 1346 */ 1347 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1348 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1349 } 1350 else { 1351 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1352 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1353 } 1354 break; 1355 #endif 1356 #ifdef INET6 1357 case AF_INET6: 1358 sin6 = satocsin6(sa); 1359 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1360 /* 1361 * An IP6 address of 0 means listen to or stop 1362 * listening to all of the Ethernet multicast 1363 * address used for IP6. 1364 * (This is used for multicast routers.) 1365 */ 1366 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1367 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1368 } else { 1369 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1370 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1371 } 1372 break; 1373 #endif 1374 1375 default: 1376 return EAFNOSUPPORT; 1377 } 1378 return 0; 1379 } 1380 1381 /* 1382 * Add an Ethernet multicast address or range of addresses to the list for a 1383 * given interface. 1384 */ 1385 int 1386 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1387 { 1388 struct ether_multi *enm; 1389 u_char addrlo[ETHER_ADDR_LEN]; 1390 u_char addrhi[ETHER_ADDR_LEN]; 1391 int s = splnet(), error; 1392 1393 error = ether_multiaddr(sa, addrlo, addrhi); 1394 if (error != 0) { 1395 splx(s); 1396 return error; 1397 } 1398 1399 /* 1400 * Verify that we have valid Ethernet multicast addresses. 1401 */ 1402 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1403 splx(s); 1404 return EINVAL; 1405 } 1406 /* 1407 * See if the address range is already in the list. 1408 */ 1409 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1410 if (enm != NULL) { 1411 /* 1412 * Found it; just increment the reference count. 1413 */ 1414 ++enm->enm_refcount; 1415 splx(s); 1416 return 0; 1417 } 1418 /* 1419 * New address or range; malloc a new multicast record 1420 * and link it into the interface's multicast list. 1421 */ 1422 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1423 if (enm == NULL) { 1424 splx(s); 1425 return ENOBUFS; 1426 } 1427 memcpy(enm->enm_addrlo, addrlo, 6); 1428 memcpy(enm->enm_addrhi, addrhi, 6); 1429 enm->enm_refcount = 1; 1430 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1431 ec->ec_multicnt++; 1432 splx(s); 1433 /* 1434 * Return ENETRESET to inform the driver that the list has changed 1435 * and its reception filter should be adjusted accordingly. 1436 */ 1437 return ENETRESET; 1438 } 1439 1440 /* 1441 * Delete a multicast address record. 1442 */ 1443 int 1444 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1445 { 1446 struct ether_multi *enm; 1447 u_char addrlo[ETHER_ADDR_LEN]; 1448 u_char addrhi[ETHER_ADDR_LEN]; 1449 int s = splnet(), error; 1450 1451 error = ether_multiaddr(sa, addrlo, addrhi); 1452 if (error != 0) { 1453 splx(s); 1454 return (error); 1455 } 1456 1457 /* 1458 * Look ur the address in our list. 1459 */ 1460 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1461 if (enm == NULL) { 1462 splx(s); 1463 return (ENXIO); 1464 } 1465 if (--enm->enm_refcount != 0) { 1466 /* 1467 * Still some claims to this record. 1468 */ 1469 splx(s); 1470 return (0); 1471 } 1472 /* 1473 * No remaining claims to this record; unlink and free it. 1474 */ 1475 LIST_REMOVE(enm, enm_list); 1476 free(enm, M_IFMADDR); 1477 ec->ec_multicnt--; 1478 splx(s); 1479 /* 1480 * Return ENETRESET to inform the driver that the list has changed 1481 * and its reception filter should be adjusted accordingly. 1482 */ 1483 return (ENETRESET); 1484 } 1485 1486 void 1487 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1488 { 1489 ec->ec_ifflags_cb = cb; 1490 } 1491 1492 /* 1493 * Common ioctls for Ethernet interfaces. Note, we must be 1494 * called at splnet(). 1495 */ 1496 int 1497 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1498 { 1499 struct ethercom *ec = (void *) ifp; 1500 struct ifreq *ifr = (struct ifreq *)data; 1501 struct if_laddrreq *iflr = data; 1502 const struct sockaddr_dl *sdl; 1503 static const uint8_t zero[ETHER_ADDR_LEN]; 1504 int error; 1505 1506 switch (cmd) { 1507 case SIOCINITIFADDR: 1508 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1509 (IFF_UP|IFF_RUNNING)) { 1510 ifp->if_flags |= IFF_UP; 1511 if ((error = (*ifp->if_init)(ifp)) != 0) 1512 return error; 1513 } 1514 #ifdef INET 1515 { 1516 struct ifaddr *ifa = (struct ifaddr *)data; 1517 1518 if (ifa->ifa_addr->sa_family == AF_INET) 1519 arp_ifinit(ifp, ifa); 1520 } 1521 #endif /* INET */ 1522 return 0; 1523 1524 case SIOCSIFMTU: 1525 { 1526 int maxmtu; 1527 1528 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1529 maxmtu = ETHERMTU_JUMBO; 1530 else 1531 maxmtu = ETHERMTU; 1532 1533 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1534 return EINVAL; 1535 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1536 return error; 1537 else if (ifp->if_flags & IFF_UP) { 1538 /* Make sure the device notices the MTU change. */ 1539 return (*ifp->if_init)(ifp); 1540 } else 1541 return 0; 1542 } 1543 1544 case SIOCSIFFLAGS: 1545 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1546 return error; 1547 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1548 case IFF_RUNNING: 1549 /* 1550 * If interface is marked down and it is running, 1551 * then stop and disable it. 1552 */ 1553 (*ifp->if_stop)(ifp, 1); 1554 break; 1555 case IFF_UP: 1556 /* 1557 * If interface is marked up and it is stopped, then 1558 * start it. 1559 */ 1560 return (*ifp->if_init)(ifp); 1561 case IFF_UP|IFF_RUNNING: 1562 error = 0; 1563 if (ec->ec_ifflags_cb == NULL || 1564 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1565 /* 1566 * Reset the interface to pick up 1567 * changes in any other flags that 1568 * affect the hardware state. 1569 */ 1570 return (*ifp->if_init)(ifp); 1571 } else 1572 return error; 1573 case 0: 1574 break; 1575 } 1576 return 0; 1577 case SIOCADDMULTI: 1578 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1579 case SIOCDELMULTI: 1580 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1581 case SIOCSIFMEDIA: 1582 case SIOCGIFMEDIA: 1583 if (ec->ec_mii == NULL) 1584 return ENOTTY; 1585 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1586 case SIOCALIFADDR: 1587 sdl = satocsdl(sstocsa(&iflr->addr)); 1588 if (sdl->sdl_family != AF_LINK) 1589 ; 1590 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1591 return EINVAL; 1592 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1593 return EINVAL; 1594 /*FALLTHROUGH*/ 1595 default: 1596 return ifioctl_common(ifp, cmd, data); 1597 } 1598 return 0; 1599 } 1600
Indexes created Tue Sep 30 06:09:59 GMT 2025