if_ethersubr.c revision 1.200
1 /* $NetBSD: if_ethersubr.c,v 1.200 2014/06/10 09:38:30 joerg 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 1.200 2014/06/10 09:38:30 joerg Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_atalk.h" 68 #include "opt_ipx.h" 69 #include "opt_mbuftrace.h" 70 #include "opt_mpls.h" 71 #include "opt_gateway.h" 72 #include "opt_pppoe.h" 73 #include "vlan.h" 74 #include "pppoe.h" 75 #include "bridge.h" 76 #include "arp.h" 77 #include "agr.h" 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/sysctl.h> 82 #include <sys/kernel.h> 83 #include <sys/callout.h> 84 #include <sys/malloc.h> 85 #include <sys/mbuf.h> 86 #include <sys/protosw.h> 87 #include <sys/socket.h> 88 #include <sys/ioctl.h> 89 #include <sys/errno.h> 90 #include <sys/syslog.h> 91 #include <sys/kauth.h> 92 #include <sys/cpu.h> 93 #include <sys/intr.h> 94 #include <sys/device.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 #include <net/if_media.h> 104 #include <dev/mii/mii.h> 105 #include <dev/mii/miivar.h> 106 107 #if NARP == 0 108 /* 109 * XXX there should really be a way to issue this warning from within config(8) 110 */ 111 #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. 112 #endif 113 114 #include <net/bpf.h> 115 116 #include <net/if_ether.h> 117 #include <net/if_vlanvar.h> 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 NETATALK 159 #include <netatalk/at.h> 160 #include <netatalk/at_var.h> 161 #include <netatalk/at_extern.h> 162 163 #define llc_snap_org_code llc_un.type_snap.org_code 164 #define llc_snap_ether_type llc_un.type_snap.ether_type 165 166 extern u_char at_org_code[3]; 167 extern u_char aarp_org_code[3]; 168 #endif /* NETATALK */ 169 170 #ifdef MPLS 171 #include <netmpls/mpls.h> 172 #include <netmpls/mpls_var.h> 173 #endif 174 175 static struct timeval bigpktppslim_last; 176 static int bigpktppslim = 2; /* XXX */ 177 static int bigpktpps_count; 178 179 180 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 181 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 182 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 183 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 184 #define senderr(e) { error = (e); goto bad;} 185 186 static int ether_output(struct ifnet *, struct mbuf *, 187 const struct sockaddr *, struct rtentry *); 188 189 /* 190 * Ethernet output routine. 191 * Encapsulate a packet of type family for the local net. 192 * Assumes that ifp is actually pointer to ethercom structure. 193 */ 194 static int 195 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 196 const struct sockaddr * const dst, 197 struct rtentry *rt0) 198 { 199 uint16_t etype = 0; 200 int error = 0, hdrcmplt = 0; 201 uint8_t esrc[6], edst[6]; 202 struct mbuf *m = m0; 203 struct rtentry *rt; 204 struct mbuf *mcopy = NULL; 205 struct ether_header *eh; 206 struct ifnet *ifp = ifp0; 207 ALTQ_DECL(struct altq_pktattr pktattr;) 208 #ifdef INET 209 struct arphdr *ah; 210 #endif /* INET */ 211 #ifdef NETATALK 212 struct at_ifaddr *aa; 213 #endif /* NETATALK */ 214 215 KASSERT(KERNEL_LOCKED_P()); 216 217 #ifdef MBUFTRACE 218 m_claimm(m, ifp->if_mowner); 219 #endif 220 221 #if NCARP > 0 222 if (ifp->if_type == IFT_CARP) { 223 struct ifaddr *ifa; 224 225 /* loop back if this is going to the carp interface */ 226 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 227 (ifa = ifa_ifwithaddr(dst)) != NULL && 228 ifa->ifa_ifp == ifp0) 229 return looutput(ifp0, m, dst, rt0); 230 231 ifp = ifp->if_carpdev; 232 /* ac = (struct arpcom *)ifp; */ 233 234 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 235 (IFF_UP|IFF_RUNNING)) 236 senderr(ENETDOWN); 237 } 238 #endif /* NCARP > 0 */ 239 240 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 241 senderr(ENETDOWN); 242 if ((rt = rt0) != NULL) { 243 if ((rt->rt_flags & RTF_UP) == 0) { 244 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 245 rt->rt_refcnt--; 246 if (rt->rt_ifp != ifp) 247 return (*rt->rt_ifp->if_output) 248 (ifp, m0, dst, rt); 249 } else 250 senderr(EHOSTUNREACH); 251 } 252 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 253 if (rt->rt_gwroute == NULL) 254 goto lookup; 255 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 256 rtfree(rt); rt = rt0; 257 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 258 if ((rt = rt->rt_gwroute) == NULL) 259 senderr(EHOSTUNREACH); 260 /* the "G" test below also prevents rt == rt0 */ 261 if ((rt->rt_flags & RTF_GATEWAY) || 262 (rt->rt_ifp != ifp)) { 263 rt->rt_refcnt--; 264 rt0->rt_gwroute = NULL; 265 senderr(EHOSTUNREACH); 266 } 267 } 268 } 269 if (rt->rt_flags & RTF_REJECT) 270 if (rt->rt_rmx.rmx_expire == 0 || 271 (u_long) time_second < rt->rt_rmx.rmx_expire) 272 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 273 } 274 275 switch (dst->sa_family) { 276 277 #ifdef INET 278 case AF_INET: 279 if (m->m_flags & M_BCAST) 280 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 281 else if (m->m_flags & M_MCAST) 282 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 283 else if (!arpresolve(ifp, rt, m, dst, edst)) 284 return (0); /* if not yet resolved */ 285 /* If broadcasting on a simplex interface, loopback a copy */ 286 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 287 mcopy = m_copy(m, 0, (int)M_COPYALL); 288 etype = htons(ETHERTYPE_IP); 289 break; 290 291 case AF_ARP: 292 ah = mtod(m, struct arphdr *); 293 if (m->m_flags & M_BCAST) 294 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 295 else { 296 void *tha = ar_tha(ah); 297 298 if (tha == NULL) { 299 /* fake with ARPHDR_IEEE1394 */ 300 return 0; 301 } 302 memcpy(edst, tha, sizeof(edst)); 303 } 304 305 ah->ar_hrd = htons(ARPHRD_ETHER); 306 307 switch (ntohs(ah->ar_op)) { 308 case ARPOP_REVREQUEST: 309 case ARPOP_REVREPLY: 310 etype = htons(ETHERTYPE_REVARP); 311 break; 312 313 case ARPOP_REQUEST: 314 case ARPOP_REPLY: 315 default: 316 etype = htons(ETHERTYPE_ARP); 317 } 318 319 break; 320 #endif 321 #ifdef INET6 322 case AF_INET6: 323 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ 324 /* something bad happened */ 325 return (0); 326 } 327 etype = htons(ETHERTYPE_IPV6); 328 break; 329 #endif 330 #ifdef NETATALK 331 case AF_APPLETALK: 332 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 333 #ifdef NETATALKDEBUG 334 printf("aarpresolv failed\n"); 335 #endif /* NETATALKDEBUG */ 336 return (0); 337 } 338 /* 339 * ifaddr is the first thing in at_ifaddr 340 */ 341 aa = (struct at_ifaddr *) at_ifawithnet( 342 (const struct sockaddr_at *)dst, ifp); 343 if (aa == NULL) 344 goto bad; 345 346 /* 347 * In the phase 2 case, we need to prepend an mbuf for the 348 * llc header. Since we must preserve the value of m, 349 * which is passed to us by value, we m_copy() the first 350 * mbuf, and use it for our llc header. 351 */ 352 if (aa->aa_flags & AFA_PHASE2) { 353 struct llc llc; 354 355 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 356 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 357 llc.llc_control = LLC_UI; 358 memcpy(llc.llc_snap_org_code, at_org_code, 359 sizeof(llc.llc_snap_org_code)); 360 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 361 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 362 } else { 363 etype = htons(ETHERTYPE_ATALK); 364 } 365 break; 366 #endif /* NETATALK */ 367 #ifdef IPX 368 case AF_IPX: 369 etype = htons(ETHERTYPE_IPX); 370 memcpy(edst, 371 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 372 sizeof(edst)); 373 /* If broadcasting on a simplex interface, loopback a copy */ 374 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 375 mcopy = m_copy(m, 0, (int)M_COPYALL); 376 break; 377 #endif 378 case pseudo_AF_HDRCMPLT: 379 hdrcmplt = 1; 380 memcpy(esrc, 381 ((const struct ether_header *)dst->sa_data)->ether_shost, 382 sizeof(esrc)); 383 /* FALLTHROUGH */ 384 385 case AF_UNSPEC: 386 memcpy(edst, 387 ((const struct ether_header *)dst->sa_data)->ether_dhost, 388 sizeof(edst)); 389 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 390 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 391 break; 392 393 default: 394 printf("%s: can't handle af%d\n", ifp->if_xname, 395 dst->sa_family); 396 senderr(EAFNOSUPPORT); 397 } 398 399 #ifdef MPLS 400 if (rt0 != NULL && rt_gettag(rt0) != NULL && 401 rt_gettag(rt0)->sa_family == AF_MPLS && 402 (m->m_flags & (M_MCAST | M_BCAST)) == 0) { 403 union mpls_shim msh; 404 msh.s_addr = MPLS_GETSADDR(rt0); 405 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 406 etype = htons(ETHERTYPE_MPLS); 407 } 408 #endif 409 410 if (mcopy) 411 (void)looutput(ifp, mcopy, dst, rt); 412 413 /* If no ether type is set, this must be a 802.2 formatted packet. 414 */ 415 if (etype == 0) 416 etype = htons(m->m_pkthdr.len); 417 /* 418 * Add local net header. If no space in first mbuf, 419 * allocate another. 420 */ 421 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 422 if (m == 0) 423 senderr(ENOBUFS); 424 eh = mtod(m, struct ether_header *); 425 /* Note: etype is already in network byte order. */ 426 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 427 memcpy(eh->ether_dhost, edst, sizeof(edst)); 428 if (hdrcmplt) 429 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 430 else 431 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 432 sizeof(eh->ether_shost)); 433 434 #if NCARP > 0 435 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 436 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 437 sizeof(eh->ether_shost)); 438 } 439 #endif /* NCARP > 0 */ 440 441 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 442 return (error); 443 if (m == NULL) 444 return (0); 445 446 #if NBRIDGE > 0 447 /* 448 * Bridges require special output handling. 449 */ 450 if (ifp->if_bridge) 451 return (bridge_output(ifp, m, NULL, NULL)); 452 #endif 453 454 #if NCARP > 0 455 if (ifp != ifp0) 456 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 457 #endif /* NCARP > 0 */ 458 459 #ifdef ALTQ 460 /* 461 * If ALTQ is enabled on the parent interface, do 462 * classification; the queueing discipline might not 463 * require classification, but might require the 464 * address family/header pointer in the pktattr. 465 */ 466 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 467 altq_etherclassify(&ifp->if_snd, m, &pktattr); 468 #endif 469 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 470 471 bad: 472 if (m) 473 m_freem(m); 474 return (error); 475 } 476 477 #ifdef ALTQ 478 /* 479 * This routine is a slight hack to allow a packet to be classified 480 * if the Ethernet headers are present. It will go away when ALTQ's 481 * classification engine understands link headers. 482 */ 483 void 484 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 485 struct altq_pktattr *pktattr) 486 { 487 struct ether_header *eh; 488 uint16_t ether_type; 489 int hlen, af, hdrsize; 490 void *hdr; 491 492 hlen = ETHER_HDR_LEN; 493 eh = mtod(m, struct ether_header *); 494 495 ether_type = htons(eh->ether_type); 496 497 if (ether_type < ETHERMTU) { 498 /* LLC/SNAP */ 499 struct llc *llc = (struct llc *)(eh + 1); 500 hlen += 8; 501 502 if (m->m_len < hlen || 503 llc->llc_dsap != LLC_SNAP_LSAP || 504 llc->llc_ssap != LLC_SNAP_LSAP || 505 llc->llc_control != LLC_UI) { 506 /* Not SNAP. */ 507 goto bad; 508 } 509 510 ether_type = htons(llc->llc_un.type_snap.ether_type); 511 } 512 513 switch (ether_type) { 514 case ETHERTYPE_IP: 515 af = AF_INET; 516 hdrsize = 20; /* sizeof(struct ip) */ 517 break; 518 519 case ETHERTYPE_IPV6: 520 af = AF_INET6; 521 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 522 break; 523 524 default: 525 af = AF_UNSPEC; 526 hdrsize = 0; 527 break; 528 } 529 530 while (m->m_len <= hlen) { 531 hlen -= m->m_len; 532 m = m->m_next; 533 } 534 if (m->m_len < (hlen + hdrsize)) { 535 /* 536 * protocol header not in a single mbuf. 537 * We can't cope with this situation right 538 * now (but it shouldn't ever happen, really, anyhow). 539 */ 540 #ifdef DEBUG 541 printf("altq_etherclassify: headers span multiple mbufs: " 542 "%d < %d\n", m->m_len, (hlen + hdrsize)); 543 #endif 544 goto bad; 545 } 546 547 m->m_data += hlen; 548 m->m_len -= hlen; 549 550 hdr = mtod(m, void *); 551 552 if (ALTQ_NEEDS_CLASSIFY(ifq)) 553 pktattr->pattr_class = 554 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 555 pktattr->pattr_af = af; 556 pktattr->pattr_hdr = hdr; 557 558 m->m_data -= hlen; 559 m->m_len += hlen; 560 561 return; 562 563 bad: 564 pktattr->pattr_class = NULL; 565 pktattr->pattr_hdr = NULL; 566 pktattr->pattr_af = AF_UNSPEC; 567 } 568 #endif /* ALTQ */ 569 570 /* 571 * Process a received Ethernet packet; 572 * the packet is in the mbuf chain m with 573 * the ether header. 574 */ 575 void 576 ether_input(struct ifnet *ifp, struct mbuf *m) 577 { 578 struct ethercom *ec = (struct ethercom *) ifp; 579 pktqueue_t *pktq = NULL; 580 struct ifqueue *inq = NULL; 581 uint16_t etype; 582 struct ether_header *eh; 583 size_t ehlen; 584 int isr = 0; 585 #if defined (LLC) || defined(NETATALK) 586 struct llc *l; 587 #endif 588 589 if ((ifp->if_flags & IFF_UP) == 0) { 590 m_freem(m); 591 return; 592 } 593 594 #ifdef MBUFTRACE 595 m_claimm(m, &ec->ec_rx_mowner); 596 #endif 597 eh = mtod(m, struct ether_header *); 598 etype = ntohs(eh->ether_type); 599 ehlen = sizeof(*eh); 600 601 /* 602 * Determine if the packet is within its size limits. 603 */ 604 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 605 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 606 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 607 bigpktppslim)) { 608 printf("%s: discarding oversize frame (len=%d)\n", 609 ifp->if_xname, m->m_pkthdr.len); 610 } 611 m_freem(m); 612 return; 613 } 614 615 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 616 /* 617 * If this is not a simplex interface, drop the packet 618 * if it came from us. 619 */ 620 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 621 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 622 ETHER_ADDR_LEN) == 0) { 623 m_freem(m); 624 return; 625 } 626 627 if (memcmp(etherbroadcastaddr, 628 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 629 m->m_flags |= M_BCAST; 630 else 631 m->m_flags |= M_MCAST; 632 ifp->if_imcasts++; 633 } 634 635 /* If the CRC is still on the packet, trim it off. */ 636 if (m->m_flags & M_HASFCS) { 637 m_adj(m, -ETHER_CRC_LEN); 638 m->m_flags &= ~M_HASFCS; 639 } 640 641 ifp->if_ibytes += m->m_pkthdr.len; 642 643 #if NBRIDGE > 0 644 /* 645 * Tap the packet off here for a bridge. bridge_input() 646 * will return NULL if it has consumed the packet, otherwise 647 * it gets processed as normal. Note that bridge_input() 648 * will always return the original packet if we need to 649 * process it locally. 650 */ 651 if (ifp->if_bridge) { 652 /* clear M_PROMISC, in case the packets comes from a vlan */ 653 m->m_flags &= ~M_PROMISC; 654 m = bridge_input(ifp, m); 655 if (m == NULL) 656 return; 657 658 /* 659 * Bridge has determined that the packet is for us. 660 * Update our interface pointer -- we may have had 661 * to "bridge" the packet locally. 662 */ 663 ifp = m->m_pkthdr.rcvif; 664 } else 665 #endif /* NBRIDGE > 0 */ 666 { 667 668 #if NCARP > 0 669 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 670 /* 671 * clear M_PROMISC, in case the packets comes from a 672 * vlan 673 */ 674 m->m_flags &= ~M_PROMISC; 675 if (carp_input(m, (uint8_t *)&eh->ether_shost, 676 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 677 return; 678 } 679 #endif /* NCARP > 0 */ 680 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 681 (ifp->if_flags & IFF_PROMISC) != 0 && 682 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 683 ETHER_ADDR_LEN) != 0) { 684 m->m_flags |= M_PROMISC; 685 } 686 } 687 688 if ((m->m_flags & M_PROMISC) == 0) { 689 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 690 return; 691 if (m == NULL) 692 return; 693 694 eh = mtod(m, struct ether_header *); 695 etype = ntohs(eh->ether_type); 696 ehlen = sizeof(*eh); 697 } 698 699 #if NAGR > 0 700 if (ifp->if_agrprivate && 701 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 702 m->m_flags &= ~M_PROMISC; 703 agr_input(ifp, m); 704 return; 705 } 706 #endif /* NAGR > 0 */ 707 708 /* 709 * If VLANs are configured on the interface, check to 710 * see if the device performed the decapsulation and 711 * provided us with the tag. 712 */ 713 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 714 #if NVLAN > 0 715 /* 716 * vlan_input() will either recursively call ether_input() 717 * or drop the packet. 718 */ 719 vlan_input(ifp, m); 720 #else 721 m_freem(m); 722 #endif 723 return; 724 } 725 726 /* 727 * Handle protocols that expect to have the Ethernet header 728 * (and possibly FCS) intact. 729 */ 730 switch (etype) { 731 case ETHERTYPE_VLAN: { 732 struct ether_vlan_header *evl = (void *)eh; 733 /* 734 * If there is a tag of 0, then the VLAN header was probably 735 * just being used to store the priority. Extract the ether 736 * type, and if IP or IPV6, let them deal with it. 737 */ 738 if (m->m_len <= sizeof(*evl) 739 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 740 etype = ntohs(evl->evl_proto); 741 ehlen = sizeof(*evl); 742 if ((m->m_flags & M_PROMISC) == 0 743 && (etype == ETHERTYPE_IP 744 || etype == ETHERTYPE_IPV6)) 745 break; 746 } 747 #if NVLAN > 0 748 /* 749 * vlan_input() will either recursively call ether_input() 750 * or drop the packet. 751 */ 752 if (((struct ethercom *)ifp)->ec_nvlans != 0) 753 vlan_input(ifp, m); 754 else 755 #endif /* NVLAN > 0 */ 756 m_freem(m); 757 return; 758 } 759 #if NPPPOE > 0 760 case ETHERTYPE_PPPOEDISC: 761 case ETHERTYPE_PPPOE: 762 if (m->m_flags & M_PROMISC) { 763 m_freem(m); 764 return; 765 } 766 #ifndef PPPOE_SERVER 767 if (m->m_flags & (M_MCAST | M_BCAST)) { 768 m_freem(m); 769 return; 770 } 771 #endif 772 773 if (etype == ETHERTYPE_PPPOEDISC) 774 inq = &ppoediscinq; 775 else 776 inq = &ppoeinq; 777 if (IF_QFULL(inq)) { 778 IF_DROP(inq); 779 m_freem(m); 780 } else 781 IF_ENQUEUE(inq, m); 782 softint_schedule(pppoe_softintr); 783 return; 784 #endif /* NPPPOE > 0 */ 785 case ETHERTYPE_SLOWPROTOCOLS: { 786 uint8_t subtype; 787 788 #if defined(DIAGNOSTIC) 789 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 790 panic("ether_input: too short slow protocol packet"); 791 } 792 #endif 793 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 794 switch (subtype) { 795 #if NAGR > 0 796 case SLOWPROTOCOLS_SUBTYPE_LACP: 797 if (ifp->if_agrprivate) { 798 ieee8023ad_lacp_input(ifp, m); 799 return; 800 } 801 break; 802 803 case SLOWPROTOCOLS_SUBTYPE_MARKER: 804 if (ifp->if_agrprivate) { 805 ieee8023ad_marker_input(ifp, m); 806 return; 807 } 808 break; 809 #endif /* NAGR > 0 */ 810 default: 811 if (subtype == 0 || subtype > 10) { 812 /* illegal value */ 813 m_freem(m); 814 return; 815 } 816 /* unknown subtype */ 817 break; 818 } 819 /* FALLTHROUGH */ 820 } 821 default: 822 if (m->m_flags & M_PROMISC) { 823 m_freem(m); 824 return; 825 } 826 } 827 828 /* If the CRC is still on the packet, trim it off. */ 829 if (m->m_flags & M_HASFCS) { 830 m_adj(m, -ETHER_CRC_LEN); 831 m->m_flags &= ~M_HASFCS; 832 } 833 834 if (etype > ETHERMTU + sizeof (struct ether_header)) { 835 /* Strip off the Ethernet header. */ 836 m_adj(m, ehlen); 837 838 switch (etype) { 839 #ifdef INET 840 case ETHERTYPE_IP: 841 #ifdef GATEWAY 842 if (ipflow_fastforward(m)) 843 return; 844 #endif 845 pktq = ip_pktq; 846 break; 847 848 case ETHERTYPE_ARP: 849 isr = NETISR_ARP; 850 inq = &arpintrq; 851 break; 852 853 case ETHERTYPE_REVARP: 854 revarpinput(m); /* XXX queue? */ 855 return; 856 #endif 857 #ifdef INET6 858 case ETHERTYPE_IPV6: 859 if (__predict_false(!in6_present)) { 860 m_freem(m); 861 return; 862 } 863 #ifdef GATEWAY 864 if (ip6flow_fastforward(&m)) 865 return; 866 #endif 867 pktq = ip6_pktq; 868 break; 869 #endif 870 #ifdef IPX 871 case ETHERTYPE_IPX: 872 isr = NETISR_IPX; 873 inq = &ipxintrq; 874 break; 875 #endif 876 #ifdef NETATALK 877 case ETHERTYPE_ATALK: 878 isr = NETISR_ATALK; 879 inq = &atintrq1; 880 break; 881 case ETHERTYPE_AARP: 882 /* probably this should be done with a NETISR as well */ 883 aarpinput(ifp, m); /* XXX */ 884 return; 885 #endif /* NETATALK */ 886 #ifdef MPLS 887 case ETHERTYPE_MPLS: 888 isr = NETISR_MPLS; 889 inq = &mplsintrq; 890 break; 891 #endif 892 default: 893 m_freem(m); 894 return; 895 } 896 } else { 897 #if defined (LLC) || defined (NETATALK) 898 l = (struct llc *)(eh+1); 899 switch (l->llc_dsap) { 900 #ifdef NETATALK 901 case LLC_SNAP_LSAP: 902 switch (l->llc_control) { 903 case LLC_UI: 904 if (l->llc_ssap != LLC_SNAP_LSAP) { 905 goto dropanyway; 906 } 907 908 if (memcmp(&(l->llc_snap_org_code)[0], 909 at_org_code, sizeof(at_org_code)) == 0 && 910 ntohs(l->llc_snap_ether_type) == 911 ETHERTYPE_ATALK) { 912 inq = &atintrq2; 913 m_adj(m, sizeof(struct ether_header) 914 + sizeof(struct llc)); 915 isr = NETISR_ATALK; 916 break; 917 } 918 919 if (memcmp(&(l->llc_snap_org_code)[0], 920 aarp_org_code, 921 sizeof(aarp_org_code)) == 0 && 922 ntohs(l->llc_snap_ether_type) == 923 ETHERTYPE_AARP) { 924 m_adj( m, sizeof(struct ether_header) 925 + sizeof(struct llc)); 926 aarpinput(ifp, m); /* XXX */ 927 return; 928 } 929 930 default: 931 goto dropanyway; 932 } 933 break; 934 dropanyway: 935 #endif 936 default: 937 m_freem(m); 938 return; 939 } 940 #else /* ISO || LLC || NETATALK*/ 941 m_freem(m); 942 return; 943 #endif /* ISO || LLC || NETATALK*/ 944 } 945 946 if (__predict_true(pktq)) { 947 const uint32_t h = pktq_rps_hash(m); 948 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 949 m_freem(m); 950 } 951 return; 952 } 953 954 if (__predict_false(!inq)) { 955 /* Should not happen. */ 956 m_freem(m); 957 return; 958 } 959 if (IF_QFULL(inq)) { 960 IF_DROP(inq); 961 m_freem(m); 962 } else { 963 IF_ENQUEUE(inq, m); 964 schednetisr(isr); 965 } 966 } 967 968 /* 969 * Convert Ethernet address to printable (loggable) representation. 970 */ 971 char * 972 ether_sprintf(const u_char *ap) 973 { 974 static char etherbuf[3 * ETHER_ADDR_LEN]; 975 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 976 } 977 978 char * 979 ether_snprintf(char *buf, size_t len, const u_char *ap) 980 { 981 char *cp = buf; 982 size_t i; 983 984 for (i = 0; i < len / 3; i++) { 985 *cp++ = hexdigits[*ap >> 4]; 986 *cp++ = hexdigits[*ap++ & 0xf]; 987 *cp++ = ':'; 988 } 989 *--cp = '\0'; 990 return buf; 991 } 992 993 /* 994 * Perform common duties while attaching to interface list 995 */ 996 void 997 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 998 { 999 struct ethercom *ec = (struct ethercom *)ifp; 1000 1001 ifp->if_type = IFT_ETHER; 1002 ifp->if_hdrlen = ETHER_HDR_LEN; 1003 ifp->if_dlt = DLT_EN10MB; 1004 ifp->if_mtu = ETHERMTU; 1005 ifp->if_output = ether_output; 1006 ifp->if_input = ether_input; 1007 if (ifp->if_baudrate == 0) 1008 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1009 1010 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1011 1012 LIST_INIT(&ec->ec_multiaddrs); 1013 ifp->if_broadcastaddr = etherbroadcastaddr; 1014 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1015 #ifdef MBUFTRACE 1016 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1017 sizeof(ec->ec_tx_mowner.mo_name)); 1018 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1019 sizeof(ec->ec_tx_mowner.mo_descr)); 1020 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1021 sizeof(ec->ec_rx_mowner.mo_name)); 1022 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1023 sizeof(ec->ec_rx_mowner.mo_descr)); 1024 MOWNER_ATTACH(&ec->ec_tx_mowner); 1025 MOWNER_ATTACH(&ec->ec_rx_mowner); 1026 ifp->if_mowner = &ec->ec_tx_mowner; 1027 #endif 1028 } 1029 1030 void 1031 ether_ifdetach(struct ifnet *ifp) 1032 { 1033 struct ethercom *ec = (void *) ifp; 1034 struct ether_multi *enm; 1035 int s; 1036 1037 /* 1038 * Prevent further calls to ioctl (for example turning off 1039 * promiscuous mode from the bridge code), which eventually can 1040 * call if_init() which can cause panics because the interface 1041 * is in the process of being detached. Return device not configured 1042 * instead. 1043 */ 1044 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1045 1046 #if NBRIDGE > 0 1047 if (ifp->if_bridge) 1048 bridge_ifdetach(ifp); 1049 #endif 1050 1051 bpf_detach(ifp); 1052 1053 #if NVLAN > 0 1054 if (ec->ec_nvlans) 1055 vlan_ifdetach(ifp); 1056 #endif 1057 1058 s = splnet(); 1059 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1060 LIST_REMOVE(enm, enm_list); 1061 free(enm, M_IFMADDR); 1062 ec->ec_multicnt--; 1063 } 1064 splx(s); 1065 1066 #if 0 /* done in if_detach() */ 1067 if_free_sadl(ifp); 1068 #endif 1069 1070 ifp->if_mowner = NULL; 1071 MOWNER_DETACH(&ec->ec_rx_mowner); 1072 MOWNER_DETACH(&ec->ec_tx_mowner); 1073 } 1074 1075 #if 0 1076 /* 1077 * This is for reference. We have a table-driven version 1078 * of the little-endian crc32 generator, which is faster 1079 * than the double-loop. 1080 */ 1081 uint32_t 1082 ether_crc32_le(const uint8_t *buf, size_t len) 1083 { 1084 uint32_t c, crc, carry; 1085 size_t i, j; 1086 1087 crc = 0xffffffffU; /* initial value */ 1088 1089 for (i = 0; i < len; i++) { 1090 c = buf[i]; 1091 for (j = 0; j < 8; j++) { 1092 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1093 crc >>= 1; 1094 c >>= 1; 1095 if (carry) 1096 crc = (crc ^ ETHER_CRC_POLY_LE); 1097 } 1098 } 1099 1100 return (crc); 1101 } 1102 #else 1103 uint32_t 1104 ether_crc32_le(const uint8_t *buf, size_t len) 1105 { 1106 static const uint32_t crctab[] = { 1107 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1108 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1109 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1110 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1111 }; 1112 uint32_t crc; 1113 size_t i; 1114 1115 crc = 0xffffffffU; /* initial value */ 1116 1117 for (i = 0; i < len; i++) { 1118 crc ^= buf[i]; 1119 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1120 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1121 } 1122 1123 return (crc); 1124 } 1125 #endif 1126 1127 uint32_t 1128 ether_crc32_be(const uint8_t *buf, size_t len) 1129 { 1130 uint32_t c, crc, carry; 1131 size_t i, j; 1132 1133 crc = 0xffffffffU; /* initial value */ 1134 1135 for (i = 0; i < len; i++) { 1136 c = buf[i]; 1137 for (j = 0; j < 8; j++) { 1138 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1139 crc <<= 1; 1140 c >>= 1; 1141 if (carry) 1142 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1143 } 1144 } 1145 1146 return (crc); 1147 } 1148 1149 #ifdef INET 1150 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1151 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1152 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1153 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1154 #endif 1155 #ifdef INET6 1156 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1157 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1158 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1159 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1160 #endif 1161 1162 /* 1163 * ether_aton implementation, not using a static buffer. 1164 */ 1165 int 1166 ether_aton_r(u_char *dest, size_t len, const char *str) 1167 { 1168 const u_char *cp = (const void *)str; 1169 u_char *ep; 1170 1171 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1172 1173 if (len < ETHER_ADDR_LEN) 1174 return ENOSPC; 1175 1176 ep = dest + ETHER_ADDR_LEN; 1177 1178 while (*cp) { 1179 if (!isxdigit(*cp)) 1180 return EINVAL; 1181 *dest = atox(*cp); 1182 cp++; 1183 if (isxdigit(*cp)) { 1184 *dest = (*dest << 4) | atox(*cp); 1185 dest++; 1186 cp++; 1187 } else 1188 dest++; 1189 if (dest == ep) 1190 return *cp == '\0' ? 0 : ENAMETOOLONG; 1191 switch (*cp) { 1192 case ':': 1193 case '-': 1194 case '.': 1195 cp++; 1196 break; 1197 } 1198 } 1199 return ENOBUFS; 1200 } 1201 1202 /* 1203 * Convert a sockaddr into an Ethernet address or range of Ethernet 1204 * addresses. 1205 */ 1206 int 1207 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1208 uint8_t addrhi[ETHER_ADDR_LEN]) 1209 { 1210 #ifdef INET 1211 const struct sockaddr_in *sin; 1212 #endif /* INET */ 1213 #ifdef INET6 1214 const struct sockaddr_in6 *sin6; 1215 #endif /* INET6 */ 1216 1217 switch (sa->sa_family) { 1218 1219 case AF_UNSPEC: 1220 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1221 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1222 break; 1223 1224 #ifdef INET 1225 case AF_INET: 1226 sin = satocsin(sa); 1227 if (sin->sin_addr.s_addr == INADDR_ANY) { 1228 /* 1229 * An IP address of INADDR_ANY means listen to 1230 * or stop listening to all of the Ethernet 1231 * multicast addresses used for IP. 1232 * (This is for the sake of IP multicast routers.) 1233 */ 1234 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1235 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1236 } 1237 else { 1238 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1239 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1240 } 1241 break; 1242 #endif 1243 #ifdef INET6 1244 case AF_INET6: 1245 sin6 = satocsin6(sa); 1246 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1247 /* 1248 * An IP6 address of 0 means listen to or stop 1249 * listening to all of the Ethernet multicast 1250 * address used for IP6. 1251 * (This is used for multicast routers.) 1252 */ 1253 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1254 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1255 } else { 1256 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1257 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1258 } 1259 break; 1260 #endif 1261 1262 default: 1263 return EAFNOSUPPORT; 1264 } 1265 return 0; 1266 } 1267 1268 /* 1269 * Add an Ethernet multicast address or range of addresses to the list for a 1270 * given interface. 1271 */ 1272 int 1273 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1274 { 1275 struct ether_multi *enm; 1276 u_char addrlo[ETHER_ADDR_LEN]; 1277 u_char addrhi[ETHER_ADDR_LEN]; 1278 int s = splnet(), error; 1279 1280 error = ether_multiaddr(sa, addrlo, addrhi); 1281 if (error != 0) { 1282 splx(s); 1283 return error; 1284 } 1285 1286 /* 1287 * Verify that we have valid Ethernet multicast addresses. 1288 */ 1289 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1290 splx(s); 1291 return EINVAL; 1292 } 1293 /* 1294 * See if the address range is already in the list. 1295 */ 1296 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1297 if (enm != NULL) { 1298 /* 1299 * Found it; just increment the reference count. 1300 */ 1301 ++enm->enm_refcount; 1302 splx(s); 1303 return 0; 1304 } 1305 /* 1306 * New address or range; malloc a new multicast record 1307 * and link it into the interface's multicast list. 1308 */ 1309 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1310 if (enm == NULL) { 1311 splx(s); 1312 return ENOBUFS; 1313 } 1314 memcpy(enm->enm_addrlo, addrlo, 6); 1315 memcpy(enm->enm_addrhi, addrhi, 6); 1316 enm->enm_refcount = 1; 1317 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1318 ec->ec_multicnt++; 1319 splx(s); 1320 /* 1321 * Return ENETRESET to inform the driver that the list has changed 1322 * and its reception filter should be adjusted accordingly. 1323 */ 1324 return ENETRESET; 1325 } 1326 1327 /* 1328 * Delete a multicast address record. 1329 */ 1330 int 1331 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1332 { 1333 struct ether_multi *enm; 1334 u_char addrlo[ETHER_ADDR_LEN]; 1335 u_char addrhi[ETHER_ADDR_LEN]; 1336 int s = splnet(), error; 1337 1338 error = ether_multiaddr(sa, addrlo, addrhi); 1339 if (error != 0) { 1340 splx(s); 1341 return (error); 1342 } 1343 1344 /* 1345 * Look ur the address in our list. 1346 */ 1347 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1348 if (enm == NULL) { 1349 splx(s); 1350 return (ENXIO); 1351 } 1352 if (--enm->enm_refcount != 0) { 1353 /* 1354 * Still some claims to this record. 1355 */ 1356 splx(s); 1357 return (0); 1358 } 1359 /* 1360 * No remaining claims to this record; unlink and free it. 1361 */ 1362 LIST_REMOVE(enm, enm_list); 1363 free(enm, M_IFMADDR); 1364 ec->ec_multicnt--; 1365 splx(s); 1366 /* 1367 * Return ENETRESET to inform the driver that the list has changed 1368 * and its reception filter should be adjusted accordingly. 1369 */ 1370 return (ENETRESET); 1371 } 1372 1373 void 1374 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1375 { 1376 ec->ec_ifflags_cb = cb; 1377 } 1378 1379 /* 1380 * Common ioctls for Ethernet interfaces. Note, we must be 1381 * called at splnet(). 1382 */ 1383 int 1384 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1385 { 1386 struct ethercom *ec = (void *) ifp; 1387 struct eccapreq *eccr; 1388 struct ifreq *ifr = (struct ifreq *)data; 1389 struct if_laddrreq *iflr = data; 1390 const struct sockaddr_dl *sdl; 1391 static const uint8_t zero[ETHER_ADDR_LEN]; 1392 int error; 1393 1394 switch (cmd) { 1395 case SIOCINITIFADDR: 1396 { 1397 struct ifaddr *ifa = (struct ifaddr *)data; 1398 if (ifa->ifa_addr->sa_family != AF_LINK 1399 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1400 (IFF_UP|IFF_RUNNING)) { 1401 ifp->if_flags |= IFF_UP; 1402 if ((error = (*ifp->if_init)(ifp)) != 0) 1403 return error; 1404 } 1405 #ifdef INET 1406 if (ifa->ifa_addr->sa_family == AF_INET) 1407 arp_ifinit(ifp, ifa); 1408 #endif /* INET */ 1409 return 0; 1410 } 1411 1412 case SIOCSIFMTU: 1413 { 1414 int maxmtu; 1415 1416 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1417 maxmtu = ETHERMTU_JUMBO; 1418 else 1419 maxmtu = ETHERMTU; 1420 1421 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1422 return EINVAL; 1423 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1424 return error; 1425 else if (ifp->if_flags & IFF_UP) { 1426 /* Make sure the device notices the MTU change. */ 1427 return (*ifp->if_init)(ifp); 1428 } else 1429 return 0; 1430 } 1431 1432 case SIOCSIFFLAGS: 1433 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1434 return error; 1435 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1436 case IFF_RUNNING: 1437 /* 1438 * If interface is marked down and it is running, 1439 * then stop and disable it. 1440 */ 1441 (*ifp->if_stop)(ifp, 1); 1442 break; 1443 case IFF_UP: 1444 /* 1445 * If interface is marked up and it is stopped, then 1446 * start it. 1447 */ 1448 return (*ifp->if_init)(ifp); 1449 case IFF_UP|IFF_RUNNING: 1450 error = 0; 1451 if (ec->ec_ifflags_cb == NULL || 1452 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1453 /* 1454 * Reset the interface to pick up 1455 * changes in any other flags that 1456 * affect the hardware state. 1457 */ 1458 return (*ifp->if_init)(ifp); 1459 } else 1460 return error; 1461 case 0: 1462 break; 1463 } 1464 return 0; 1465 case SIOCGETHERCAP: 1466 eccr = (struct eccapreq *)data; 1467 eccr->eccr_capabilities = ec->ec_capabilities; 1468 eccr->eccr_capenable = ec->ec_capenable; 1469 return 0; 1470 case SIOCADDMULTI: 1471 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1472 case SIOCDELMULTI: 1473 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1474 case SIOCSIFMEDIA: 1475 case SIOCGIFMEDIA: 1476 if (ec->ec_mii == NULL) 1477 return ENOTTY; 1478 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1479 case SIOCALIFADDR: 1480 sdl = satocsdl(sstocsa(&iflr->addr)); 1481 if (sdl->sdl_family != AF_LINK) 1482 ; 1483 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1484 return EINVAL; 1485 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1486 return EINVAL; 1487 /*FALLTHROUGH*/ 1488 default: 1489 return ifioctl_common(ifp, cmd, data); 1490 } 1491 return 0; 1492 } 1493 1494 static int 1495 ether_multicast_sysctl(SYSCTLFN_ARGS) 1496 { 1497 struct ether_multi *enm; 1498 struct ether_multi_sysctl addr; 1499 struct ifnet *ifp; 1500 struct ethercom *ec; 1501 int error; 1502 size_t written; 1503 1504 if (namelen != 1) 1505 return EINVAL; 1506 1507 ifp = if_byindex(name[0]); 1508 if (ifp == NULL) 1509 return ENODEV; 1510 if (ifp->if_type != IFT_ETHER) { 1511 *oldlenp = 0; 1512 return 0; 1513 } 1514 ec = (struct ethercom *)ifp; 1515 1516 if (oldp == NULL) { 1517 *oldlenp = ec->ec_multicnt * sizeof(addr); 1518 return 0; 1519 } 1520 1521 memset(&addr, 0, sizeof(addr)); 1522 error = 0; 1523 written = 0; 1524 1525 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1526 if (written + sizeof(addr) > *oldlenp) 1527 break; 1528 addr.enm_refcount = enm->enm_refcount; 1529 memcpy(addr.enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1530 memcpy(addr.enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1531 error = sysctl_copyout(l, &addr, oldp, sizeof(addr)); 1532 if (error) 1533 break; 1534 written += sizeof(addr); 1535 oldp = (char *)oldp + sizeof(addr); 1536 } 1537 1538 *oldlenp = written; 1539 return error; 1540 } 1541 1542 SYSCTL_SETUP(sysctl_net_ether_setup, "sysctl net.ether subtree setup") 1543 { 1544 const struct sysctlnode *rnode = NULL; 1545 1546 sysctl_createv(clog, 0, NULL, &rnode, 1547 CTLFLAG_PERMANENT, 1548 CTLTYPE_NODE, "ether", 1549 SYSCTL_DESCR("Ethernet-specific information"), 1550 NULL, 0, NULL, 0, 1551 CTL_NET, CTL_CREATE, CTL_EOL); 1552 1553 sysctl_createv(clog, 0, &rnode, NULL, 1554 CTLFLAG_PERMANENT, 1555 CTLTYPE_NODE, "multicast", 1556 SYSCTL_DESCR("multicast addresses"), 1557 ether_multicast_sysctl, 0, NULL, 0, 1558 CTL_CREATE, CTL_EOL); 1559 } 1560
Indexes created Thu Sep 25 16:09:42 GMT 2025