if_ethersubr.c revision 1.229
1 /* $NetBSD: if_ethersubr.c,v 1.229 2016/10/18 07:30:30 ozaki-r 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 1.229 2016/10/18 07:30:30 ozaki-r Exp $"); 65 66 #ifdef _KERNEL_OPT 67 #include "opt_inet.h" 68 #include "opt_atalk.h" 69 #include "opt_mbuftrace.h" 70 #include "opt_mpls.h" 71 #include "opt_gateway.h" 72 #include "opt_pppoe.h" 73 #include "opt_net_mpsafe.h" 74 #endif 75 76 #include "vlan.h" 77 #include "pppoe.h" 78 #include "bridge.h" 79 #include "arp.h" 80 #include "agr.h" 81 82 #include <sys/sysctl.h> 83 #include <sys/malloc.h> 84 #include <sys/mbuf.h> 85 #include <sys/mutex.h> 86 #include <sys/ioctl.h> 87 #include <sys/errno.h> 88 #include <sys/device.h> 89 #include <sys/rnd.h> 90 #include <sys/rndsource.h> 91 #include <sys/cpu.h> 92 93 #include <net/if.h> 94 #include <net/netisr.h> 95 #include <net/route.h> 96 #include <net/if_llc.h> 97 #include <net/if_dl.h> 98 #include <net/if_types.h> 99 #include <net/pktqueue.h> 100 101 #include <net/if_media.h> 102 #include <dev/mii/mii.h> 103 #include <dev/mii/miivar.h> 104 105 #if NARP == 0 106 /* 107 * XXX there should really be a way to issue this warning from within config(8) 108 */ 109 #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. 110 #endif 111 112 #include <net/bpf.h> 113 114 #include <net/if_ether.h> 115 #include <net/if_vlanvar.h> 116 117 #if NPPPOE > 0 118 #include <net/if_pppoe.h> 119 #endif 120 121 #if NAGR > 0 122 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 123 #include <net/agr/ieee8023ad.h> 124 #include <net/agr/if_agrvar.h> 125 #endif 126 127 #if NBRIDGE > 0 128 #include <net/if_bridgevar.h> 129 #endif 130 131 #include <netinet/in.h> 132 #ifdef INET 133 #include <netinet/in_var.h> 134 #endif 135 #include <netinet/if_inarp.h> 136 137 #ifdef INET6 138 #ifndef INET 139 #include <netinet/in.h> 140 #endif 141 #include <netinet6/in6_var.h> 142 #include <netinet6/nd6.h> 143 #endif 144 145 146 #include "carp.h" 147 #if NCARP > 0 148 #include <netinet/ip_carp.h> 149 #endif 150 151 #ifdef NETATALK 152 #include <netatalk/at.h> 153 #include <netatalk/at_var.h> 154 #include <netatalk/at_extern.h> 155 156 #define llc_snap_org_code llc_un.type_snap.org_code 157 #define llc_snap_ether_type llc_un.type_snap.ether_type 158 159 extern u_char at_org_code[3]; 160 extern u_char aarp_org_code[3]; 161 #endif /* NETATALK */ 162 163 #ifdef MPLS 164 #include <netmpls/mpls.h> 165 #include <netmpls/mpls_var.h> 166 #endif 167 168 static struct timeval bigpktppslim_last; 169 static int bigpktppslim = 2; /* XXX */ 170 static int bigpktpps_count; 171 static kmutex_t bigpktpps_lock __cacheline_aligned; 172 173 174 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 175 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 176 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 177 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 178 #define senderr(e) { error = (e); goto bad;} 179 180 static int ether_output(struct ifnet *, struct mbuf *, 181 const struct sockaddr *, const struct rtentry *); 182 183 /* 184 * Ethernet output routine. 185 * Encapsulate a packet of type family for the local net. 186 * Assumes that ifp is actually pointer to ethercom structure. 187 */ 188 static int 189 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 190 const struct sockaddr * const dst, 191 const struct rtentry *rt) 192 { 193 uint16_t etype = 0; 194 int error = 0, hdrcmplt = 0; 195 uint8_t esrc[6], edst[6]; 196 struct mbuf *m = m0; 197 struct mbuf *mcopy = NULL; 198 struct ether_header *eh; 199 struct ifnet *ifp = ifp0; 200 #ifdef INET 201 struct arphdr *ah; 202 #endif /* INET */ 203 #ifdef NETATALK 204 struct at_ifaddr *aa; 205 #endif /* NETATALK */ 206 207 /* 208 * some paths such as carp_output() call ethr_output() with "ifp" 209 * argument as other than ether ifnet. 210 */ 211 KASSERT(ifp->if_output != ether_output 212 || ifp->if_extflags & IFEF_OUTPUT_MPSAFE); 213 214 #ifdef MBUFTRACE 215 m_claimm(m, ifp->if_mowner); 216 #endif 217 218 #if NCARP > 0 219 if (ifp->if_type == IFT_CARP) { 220 struct ifaddr *ifa; 221 int s = pserialize_read_enter(); 222 223 /* loop back if this is going to the carp interface */ 224 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 225 (ifa = ifa_ifwithaddr(dst)) != NULL) { 226 if (ifa->ifa_ifp == ifp0) { 227 pserialize_read_exit(s); 228 return looutput(ifp0, m, dst, rt); 229 } 230 } 231 pserialize_read_exit(s); 232 233 ifp = ifp->if_carpdev; 234 /* ac = (struct arpcom *)ifp; */ 235 236 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 237 (IFF_UP|IFF_RUNNING)) 238 senderr(ENETDOWN); 239 } 240 #endif /* NCARP > 0 */ 241 242 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 243 senderr(ENETDOWN); 244 245 switch (dst->sa_family) { 246 247 #ifdef INET 248 case AF_INET: 249 #ifndef NET_MPSAFE 250 KERNEL_LOCK(1, NULL); 251 #endif 252 if (m->m_flags & M_BCAST) 253 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 254 else if (m->m_flags & M_MCAST) 255 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 256 else if ((error = arpresolve(ifp, rt, m, dst, edst, 257 sizeof(edst))) != 0) { 258 #ifndef NET_MPSAFE 259 KERNEL_UNLOCK_ONE(NULL); 260 #endif 261 return error == EWOULDBLOCK ? 0 : error; 262 } 263 #ifndef NET_MPSAFE 264 KERNEL_UNLOCK_ONE(NULL); 265 #endif 266 /* If broadcasting on a simplex interface, loopback a copy */ 267 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 268 mcopy = m_copy(m, 0, (int)M_COPYALL); 269 etype = htons(ETHERTYPE_IP); 270 break; 271 272 case AF_ARP: 273 ah = mtod(m, struct arphdr *); 274 if (m->m_flags & M_BCAST) 275 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 276 else { 277 void *tha = ar_tha(ah); 278 279 if (tha == NULL) { 280 /* fake with ARPHDR_IEEE1394 */ 281 return 0; 282 } 283 memcpy(edst, tha, sizeof(edst)); 284 } 285 286 ah->ar_hrd = htons(ARPHRD_ETHER); 287 288 switch (ntohs(ah->ar_op)) { 289 case ARPOP_REVREQUEST: 290 case ARPOP_REVREPLY: 291 etype = htons(ETHERTYPE_REVARP); 292 break; 293 294 case ARPOP_REQUEST: 295 case ARPOP_REPLY: 296 default: 297 etype = htons(ETHERTYPE_ARP); 298 } 299 300 break; 301 #endif 302 #ifdef INET6 303 case AF_INET6: 304 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ 305 /* something bad happened */ 306 return (0); 307 } 308 etype = htons(ETHERTYPE_IPV6); 309 break; 310 #endif 311 #ifdef NETATALK 312 case AF_APPLETALK: { 313 struct ifaddr *ifa; 314 int s; 315 316 KERNEL_LOCK(1, NULL); 317 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 318 #ifdef NETATALKDEBUG 319 printf("aarpresolv failed\n"); 320 #endif /* NETATALKDEBUG */ 321 KERNEL_UNLOCK_ONE(NULL); 322 return (0); 323 } 324 /* 325 * ifaddr is the first thing in at_ifaddr 326 */ 327 s = pserialize_read_enter(); 328 ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); 329 if (ifa == NULL) { 330 pserialize_read_exit(s); 331 KERNEL_UNLOCK_ONE(NULL); 332 goto bad; 333 } 334 aa = (struct at_ifaddr *)ifa; 335 336 /* 337 * In the phase 2 case, we need to prepend an mbuf for the 338 * llc header. Since we must preserve the value of m, 339 * which is passed to us by value, we m_copy() the first 340 * mbuf, and use it for our llc header. 341 */ 342 if (aa->aa_flags & AFA_PHASE2) { 343 struct llc llc; 344 345 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 346 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 347 llc.llc_control = LLC_UI; 348 memcpy(llc.llc_snap_org_code, at_org_code, 349 sizeof(llc.llc_snap_org_code)); 350 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 351 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 352 } else { 353 etype = htons(ETHERTYPE_ATALK); 354 } 355 pserialize_read_exit(s); 356 KERNEL_UNLOCK_ONE(NULL); 357 break; 358 } 359 #endif /* NETATALK */ 360 case pseudo_AF_HDRCMPLT: 361 hdrcmplt = 1; 362 memcpy(esrc, 363 ((const struct ether_header *)dst->sa_data)->ether_shost, 364 sizeof(esrc)); 365 /* FALLTHROUGH */ 366 367 case AF_UNSPEC: 368 memcpy(edst, 369 ((const struct ether_header *)dst->sa_data)->ether_dhost, 370 sizeof(edst)); 371 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 372 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 373 break; 374 375 default: 376 printf("%s: can't handle af%d\n", ifp->if_xname, 377 dst->sa_family); 378 senderr(EAFNOSUPPORT); 379 } 380 381 #ifdef MPLS 382 KERNEL_LOCK(1, NULL); 383 { 384 struct m_tag *mtag; 385 mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL); 386 if (mtag != NULL) { 387 /* Having the tag itself indicates it's MPLS */ 388 etype = htons(ETHERTYPE_MPLS); 389 m_tag_delete(m, mtag); 390 } 391 } 392 KERNEL_UNLOCK_ONE(NULL); 393 #endif 394 395 if (mcopy) 396 (void)looutput(ifp, mcopy, dst, rt); 397 398 /* If no ether type is set, this must be a 802.2 formatted packet. 399 */ 400 if (etype == 0) 401 etype = htons(m->m_pkthdr.len); 402 /* 403 * Add local net header. If no space in first mbuf, 404 * allocate another. 405 */ 406 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 407 if (m == 0) 408 senderr(ENOBUFS); 409 eh = mtod(m, struct ether_header *); 410 /* Note: etype is already in network byte order. */ 411 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 412 memcpy(eh->ether_dhost, edst, sizeof(edst)); 413 if (hdrcmplt) 414 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 415 else 416 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 417 sizeof(eh->ether_shost)); 418 419 #if NCARP > 0 420 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 421 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 422 sizeof(eh->ether_shost)); 423 } 424 #endif /* NCARP > 0 */ 425 426 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 427 return (error); 428 if (m == NULL) 429 return (0); 430 431 #if NBRIDGE > 0 432 /* 433 * Bridges require special output handling. 434 */ 435 if (ifp->if_bridge) 436 return (bridge_output(ifp, m, NULL, NULL)); 437 #endif 438 439 #if NCARP > 0 440 if (ifp != ifp0) 441 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 442 #endif /* NCARP > 0 */ 443 444 #ifdef ALTQ 445 KERNEL_LOCK(1, NULL); 446 /* 447 * If ALTQ is enabled on the parent interface, do 448 * classification; the queueing discipline might not 449 * require classification, but might require the 450 * address family/header pointer in the pktattr. 451 */ 452 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 453 altq_etherclassify(&ifp->if_snd, m); 454 KERNEL_UNLOCK_ONE(NULL); 455 #endif 456 return ifq_enqueue(ifp, m); 457 458 bad: 459 if (m) 460 m_freem(m); 461 return (error); 462 } 463 464 #ifdef ALTQ 465 /* 466 * This routine is a slight hack to allow a packet to be classified 467 * if the Ethernet headers are present. It will go away when ALTQ's 468 * classification engine understands link headers. 469 */ 470 void 471 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) 472 { 473 struct ether_header *eh; 474 uint16_t ether_type; 475 int hlen, af, hdrsize; 476 void *hdr; 477 478 hlen = ETHER_HDR_LEN; 479 eh = mtod(m, struct ether_header *); 480 481 ether_type = htons(eh->ether_type); 482 483 if (ether_type < ETHERMTU) { 484 /* LLC/SNAP */ 485 struct llc *llc = (struct llc *)(eh + 1); 486 hlen += 8; 487 488 if (m->m_len < hlen || 489 llc->llc_dsap != LLC_SNAP_LSAP || 490 llc->llc_ssap != LLC_SNAP_LSAP || 491 llc->llc_control != LLC_UI) { 492 /* Not SNAP. */ 493 goto bad; 494 } 495 496 ether_type = htons(llc->llc_un.type_snap.ether_type); 497 } 498 499 switch (ether_type) { 500 case ETHERTYPE_IP: 501 af = AF_INET; 502 hdrsize = 20; /* sizeof(struct ip) */ 503 break; 504 505 case ETHERTYPE_IPV6: 506 af = AF_INET6; 507 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 508 break; 509 510 default: 511 af = AF_UNSPEC; 512 hdrsize = 0; 513 break; 514 } 515 516 while (m->m_len <= hlen) { 517 hlen -= m->m_len; 518 m = m->m_next; 519 } 520 if (m->m_len < (hlen + hdrsize)) { 521 /* 522 * protocol header not in a single mbuf. 523 * We can't cope with this situation right 524 * now (but it shouldn't ever happen, really, anyhow). 525 */ 526 #ifdef DEBUG 527 printf("altq_etherclassify: headers span multiple mbufs: " 528 "%d < %d\n", m->m_len, (hlen + hdrsize)); 529 #endif 530 goto bad; 531 } 532 533 m->m_data += hlen; 534 m->m_len -= hlen; 535 536 hdr = mtod(m, void *); 537 538 if (ALTQ_NEEDS_CLASSIFY(ifq)) 539 m->m_pkthdr.pattr_class = 540 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 541 m->m_pkthdr.pattr_af = af; 542 m->m_pkthdr.pattr_hdr = hdr; 543 544 m->m_data -= hlen; 545 m->m_len += hlen; 546 547 return; 548 549 bad: 550 m->m_pkthdr.pattr_class = NULL; 551 m->m_pkthdr.pattr_hdr = NULL; 552 m->m_pkthdr.pattr_af = AF_UNSPEC; 553 } 554 #endif /* ALTQ */ 555 556 /* 557 * Process a received Ethernet packet; 558 * the packet is in the mbuf chain m with 559 * the ether header. 560 */ 561 void 562 ether_input(struct ifnet *ifp, struct mbuf *m) 563 { 564 struct ethercom *ec = (struct ethercom *) ifp; 565 pktqueue_t *pktq = NULL; 566 struct ifqueue *inq = NULL; 567 uint16_t etype; 568 struct ether_header *eh; 569 size_t ehlen; 570 static int earlypkts; 571 int isr = 0; 572 #if defined (LLC) || defined(NETATALK) 573 struct llc *l; 574 #endif 575 576 KASSERT(!cpu_intr_p()); 577 578 if ((ifp->if_flags & IFF_UP) == 0) { 579 m_freem(m); 580 return; 581 } 582 583 #ifdef MBUFTRACE 584 m_claimm(m, &ec->ec_rx_mowner); 585 #endif 586 eh = mtod(m, struct ether_header *); 587 etype = ntohs(eh->ether_type); 588 ehlen = sizeof(*eh); 589 590 if(__predict_false(earlypkts < 100 || !rnd_initial_entropy)) { 591 rnd_add_data(NULL, eh, ehlen, 0); 592 earlypkts++; 593 } 594 595 /* 596 * Determine if the packet is within its size limits. 597 */ 598 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 599 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 600 mutex_enter(&bigpktpps_lock); 601 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 602 bigpktppslim)) { 603 printf("%s: discarding oversize frame (len=%d)\n", 604 ifp->if_xname, m->m_pkthdr.len); 605 } 606 mutex_exit(&bigpktpps_lock); 607 m_freem(m); 608 return; 609 } 610 611 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 612 /* 613 * If this is not a simplex interface, drop the packet 614 * if it came from us. 615 */ 616 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 617 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 618 ETHER_ADDR_LEN) == 0) { 619 m_freem(m); 620 return; 621 } 622 623 if (memcmp(etherbroadcastaddr, 624 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 625 m->m_flags |= M_BCAST; 626 else 627 m->m_flags |= M_MCAST; 628 ifp->if_imcasts++; 629 } 630 631 /* If the CRC is still on the packet, trim it off. */ 632 if (m->m_flags & M_HASFCS) { 633 m_adj(m, -ETHER_CRC_LEN); 634 m->m_flags &= ~M_HASFCS; 635 } 636 637 ifp->if_ibytes += m->m_pkthdr.len; 638 639 #if NCARP > 0 640 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 641 /* 642 * clear M_PROMISC, in case the packets comes from a 643 * vlan 644 */ 645 m->m_flags &= ~M_PROMISC; 646 if (carp_input(m, (uint8_t *)&eh->ether_shost, 647 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 648 return; 649 } 650 #endif /* NCARP > 0 */ 651 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 652 (ifp->if_flags & IFF_PROMISC) != 0 && 653 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 654 ETHER_ADDR_LEN) != 0) { 655 m->m_flags |= M_PROMISC; 656 } 657 658 if ((m->m_flags & M_PROMISC) == 0) { 659 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 660 return; 661 if (m == NULL) 662 return; 663 664 eh = mtod(m, struct ether_header *); 665 etype = ntohs(eh->ether_type); 666 ehlen = sizeof(*eh); 667 } 668 669 #if NAGR > 0 670 if (ifp->if_agrprivate && 671 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 672 m->m_flags &= ~M_PROMISC; 673 agr_input(ifp, m); 674 return; 675 } 676 #endif /* NAGR > 0 */ 677 678 /* 679 * If VLANs are configured on the interface, check to 680 * see if the device performed the decapsulation and 681 * provided us with the tag. 682 */ 683 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 684 #if NVLAN > 0 685 /* 686 * vlan_input() will either recursively call ether_input() 687 * or drop the packet. 688 */ 689 vlan_input(ifp, m); 690 #else 691 m_freem(m); 692 #endif 693 return; 694 } 695 696 /* 697 * Handle protocols that expect to have the Ethernet header 698 * (and possibly FCS) intact. 699 */ 700 switch (etype) { 701 case ETHERTYPE_VLAN: { 702 struct ether_vlan_header *evl = (void *)eh; 703 /* 704 * If there is a tag of 0, then the VLAN header was probably 705 * just being used to store the priority. Extract the ether 706 * type, and if IP or IPV6, let them deal with it. 707 */ 708 if (m->m_len <= sizeof(*evl) 709 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 710 etype = ntohs(evl->evl_proto); 711 ehlen = sizeof(*evl); 712 if ((m->m_flags & M_PROMISC) == 0 713 && (etype == ETHERTYPE_IP 714 || etype == ETHERTYPE_IPV6)) 715 break; 716 } 717 #if NVLAN > 0 718 /* 719 * vlan_input() will either recursively call ether_input() 720 * or drop the packet. 721 */ 722 if (((struct ethercom *)ifp)->ec_nvlans != 0) 723 vlan_input(ifp, m); 724 else 725 #endif /* NVLAN > 0 */ 726 m_freem(m); 727 return; 728 } 729 #if NPPPOE > 0 730 case ETHERTYPE_PPPOEDISC: 731 pppoedisc_input(ifp, m); 732 return; 733 case ETHERTYPE_PPPOE: 734 pppoe_input(ifp, m); 735 return; 736 #endif /* NPPPOE > 0 */ 737 case ETHERTYPE_SLOWPROTOCOLS: { 738 uint8_t subtype; 739 740 #if defined(DIAGNOSTIC) 741 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 742 panic("ether_input: too short slow protocol packet"); 743 } 744 #endif 745 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 746 switch (subtype) { 747 #if NAGR > 0 748 case SLOWPROTOCOLS_SUBTYPE_LACP: 749 if (ifp->if_agrprivate) { 750 ieee8023ad_lacp_input(ifp, m); 751 return; 752 } 753 break; 754 755 case SLOWPROTOCOLS_SUBTYPE_MARKER: 756 if (ifp->if_agrprivate) { 757 ieee8023ad_marker_input(ifp, m); 758 return; 759 } 760 break; 761 #endif /* NAGR > 0 */ 762 default: 763 if (subtype == 0 || subtype > 10) { 764 /* illegal value */ 765 m_freem(m); 766 return; 767 } 768 /* unknown subtype */ 769 break; 770 } 771 /* FALLTHROUGH */ 772 } 773 default: 774 if (m->m_flags & M_PROMISC) { 775 m_freem(m); 776 return; 777 } 778 } 779 780 /* If the CRC is still on the packet, trim it off. */ 781 if (m->m_flags & M_HASFCS) { 782 m_adj(m, -ETHER_CRC_LEN); 783 m->m_flags &= ~M_HASFCS; 784 } 785 786 if (etype > ETHERMTU + sizeof (struct ether_header)) { 787 /* Strip off the Ethernet header. */ 788 m_adj(m, ehlen); 789 790 switch (etype) { 791 #ifdef INET 792 case ETHERTYPE_IP: 793 #ifdef GATEWAY 794 if (ipflow_fastforward(m)) 795 return; 796 #endif 797 pktq = ip_pktq; 798 break; 799 800 case ETHERTYPE_ARP: 801 isr = NETISR_ARP; 802 inq = &arpintrq; 803 break; 804 805 case ETHERTYPE_REVARP: 806 revarpinput(m); /* XXX queue? */ 807 return; 808 #endif 809 #ifdef INET6 810 case ETHERTYPE_IPV6: 811 if (__predict_false(!in6_present)) { 812 m_freem(m); 813 return; 814 } 815 #ifdef GATEWAY 816 if (ip6flow_fastforward(&m)) 817 return; 818 #endif 819 pktq = ip6_pktq; 820 break; 821 #endif 822 #ifdef NETATALK 823 case ETHERTYPE_ATALK: 824 isr = NETISR_ATALK; 825 inq = &atintrq1; 826 break; 827 case ETHERTYPE_AARP: 828 /* probably this should be done with a NETISR as well */ 829 aarpinput(ifp, m); /* XXX */ 830 return; 831 #endif /* NETATALK */ 832 #ifdef MPLS 833 case ETHERTYPE_MPLS: 834 isr = NETISR_MPLS; 835 inq = &mplsintrq; 836 break; 837 #endif 838 default: 839 m_freem(m); 840 return; 841 } 842 } else { 843 #if defined (LLC) || defined (NETATALK) 844 l = (struct llc *)(eh+1); 845 switch (l->llc_dsap) { 846 #ifdef NETATALK 847 case LLC_SNAP_LSAP: 848 switch (l->llc_control) { 849 case LLC_UI: 850 if (l->llc_ssap != LLC_SNAP_LSAP) { 851 goto dropanyway; 852 } 853 854 if (memcmp(&(l->llc_snap_org_code)[0], 855 at_org_code, sizeof(at_org_code)) == 0 && 856 ntohs(l->llc_snap_ether_type) == 857 ETHERTYPE_ATALK) { 858 inq = &atintrq2; 859 m_adj(m, sizeof(struct ether_header) 860 + sizeof(struct llc)); 861 isr = NETISR_ATALK; 862 break; 863 } 864 865 if (memcmp(&(l->llc_snap_org_code)[0], 866 aarp_org_code, 867 sizeof(aarp_org_code)) == 0 && 868 ntohs(l->llc_snap_ether_type) == 869 ETHERTYPE_AARP) { 870 m_adj( m, sizeof(struct ether_header) 871 + sizeof(struct llc)); 872 aarpinput(ifp, m); /* XXX */ 873 return; 874 } 875 876 default: 877 goto dropanyway; 878 } 879 break; 880 dropanyway: 881 #endif 882 default: 883 m_freem(m); 884 return; 885 } 886 #else /* ISO || LLC || NETATALK*/ 887 m_freem(m); 888 return; 889 #endif /* ISO || LLC || NETATALK*/ 890 } 891 892 if (__predict_true(pktq)) { 893 #ifdef NET_MPSAFE 894 const u_int h = curcpu()->ci_index; 895 #else 896 const uint32_t h = pktq_rps_hash(m); 897 #endif 898 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 899 m_freem(m); 900 } 901 return; 902 } 903 904 if (__predict_false(!inq)) { 905 /* Should not happen. */ 906 m_freem(m); 907 return; 908 } 909 910 IFQ_LOCK(inq); 911 if (IF_QFULL(inq)) { 912 IF_DROP(inq); 913 IFQ_UNLOCK(inq); 914 m_freem(m); 915 } else { 916 IF_ENQUEUE(inq, m); 917 IFQ_UNLOCK(inq); 918 schednetisr(isr); 919 } 920 } 921 922 /* 923 * Convert Ethernet address to printable (loggable) representation. 924 */ 925 char * 926 ether_sprintf(const u_char *ap) 927 { 928 static char etherbuf[3 * ETHER_ADDR_LEN]; 929 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 930 } 931 932 char * 933 ether_snprintf(char *buf, size_t len, const u_char *ap) 934 { 935 char *cp = buf; 936 size_t i; 937 938 for (i = 0; i < len / 3; i++) { 939 *cp++ = hexdigits[*ap >> 4]; 940 *cp++ = hexdigits[*ap++ & 0xf]; 941 *cp++ = ':'; 942 } 943 *--cp = '\0'; 944 return buf; 945 } 946 947 /* 948 * Perform common duties while attaching to interface list 949 */ 950 void 951 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 952 { 953 struct ethercom *ec = (struct ethercom *)ifp; 954 955 ifp->if_extflags |= IFEF_OUTPUT_MPSAFE; 956 ifp->if_type = IFT_ETHER; 957 ifp->if_hdrlen = ETHER_HDR_LEN; 958 ifp->if_dlt = DLT_EN10MB; 959 ifp->if_mtu = ETHERMTU; 960 ifp->if_output = ether_output; 961 ifp->_if_input = ether_input; 962 if (ifp->if_baudrate == 0) 963 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 964 965 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 966 967 LIST_INIT(&ec->ec_multiaddrs); 968 ifp->if_broadcastaddr = etherbroadcastaddr; 969 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 970 #ifdef MBUFTRACE 971 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 972 sizeof(ec->ec_tx_mowner.mo_name)); 973 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 974 sizeof(ec->ec_tx_mowner.mo_descr)); 975 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 976 sizeof(ec->ec_rx_mowner.mo_name)); 977 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 978 sizeof(ec->ec_rx_mowner.mo_descr)); 979 MOWNER_ATTACH(&ec->ec_tx_mowner); 980 MOWNER_ATTACH(&ec->ec_rx_mowner); 981 ifp->if_mowner = &ec->ec_tx_mowner; 982 #endif 983 } 984 985 void 986 ether_ifdetach(struct ifnet *ifp) 987 { 988 struct ethercom *ec = (void *) ifp; 989 struct ether_multi *enm; 990 int s; 991 992 /* 993 * Prevent further calls to ioctl (for example turning off 994 * promiscuous mode from the bridge code), which eventually can 995 * call if_init() which can cause panics because the interface 996 * is in the process of being detached. Return device not configured 997 * instead. 998 */ 999 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1000 1001 #if NBRIDGE > 0 1002 if (ifp->if_bridge) 1003 bridge_ifdetach(ifp); 1004 #endif 1005 1006 bpf_detach(ifp); 1007 1008 #if NVLAN > 0 1009 if (ec->ec_nvlans) 1010 vlan_ifdetach(ifp); 1011 #endif 1012 1013 s = splnet(); 1014 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1015 LIST_REMOVE(enm, enm_list); 1016 free(enm, M_IFMADDR); 1017 ec->ec_multicnt--; 1018 } 1019 splx(s); 1020 1021 ifp->if_mowner = NULL; 1022 MOWNER_DETACH(&ec->ec_rx_mowner); 1023 MOWNER_DETACH(&ec->ec_tx_mowner); 1024 } 1025 1026 #if 0 1027 /* 1028 * This is for reference. We have a table-driven version 1029 * of the little-endian crc32 generator, which is faster 1030 * than the double-loop. 1031 */ 1032 uint32_t 1033 ether_crc32_le(const uint8_t *buf, size_t len) 1034 { 1035 uint32_t c, crc, carry; 1036 size_t i, j; 1037 1038 crc = 0xffffffffU; /* initial value */ 1039 1040 for (i = 0; i < len; i++) { 1041 c = buf[i]; 1042 for (j = 0; j < 8; j++) { 1043 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1044 crc >>= 1; 1045 c >>= 1; 1046 if (carry) 1047 crc = (crc ^ ETHER_CRC_POLY_LE); 1048 } 1049 } 1050 1051 return (crc); 1052 } 1053 #else 1054 uint32_t 1055 ether_crc32_le(const uint8_t *buf, size_t len) 1056 { 1057 static const uint32_t crctab[] = { 1058 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1059 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1060 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1061 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1062 }; 1063 uint32_t crc; 1064 size_t i; 1065 1066 crc = 0xffffffffU; /* initial value */ 1067 1068 for (i = 0; i < len; i++) { 1069 crc ^= buf[i]; 1070 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1071 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1072 } 1073 1074 return (crc); 1075 } 1076 #endif 1077 1078 uint32_t 1079 ether_crc32_be(const uint8_t *buf, size_t len) 1080 { 1081 uint32_t c, crc, carry; 1082 size_t i, j; 1083 1084 crc = 0xffffffffU; /* initial value */ 1085 1086 for (i = 0; i < len; i++) { 1087 c = buf[i]; 1088 for (j = 0; j < 8; j++) { 1089 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1090 crc <<= 1; 1091 c >>= 1; 1092 if (carry) 1093 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1094 } 1095 } 1096 1097 return (crc); 1098 } 1099 1100 #ifdef INET 1101 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1102 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1103 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1104 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1105 #endif 1106 #ifdef INET6 1107 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1108 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1109 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1110 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1111 #endif 1112 1113 /* 1114 * ether_aton implementation, not using a static buffer. 1115 */ 1116 int 1117 ether_aton_r(u_char *dest, size_t len, const char *str) 1118 { 1119 const u_char *cp = (const void *)str; 1120 u_char *ep; 1121 1122 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1123 1124 if (len < ETHER_ADDR_LEN) 1125 return ENOSPC; 1126 1127 ep = dest + ETHER_ADDR_LEN; 1128 1129 while (*cp) { 1130 if (!isxdigit(*cp)) 1131 return EINVAL; 1132 *dest = atox(*cp); 1133 cp++; 1134 if (isxdigit(*cp)) { 1135 *dest = (*dest << 4) | atox(*cp); 1136 dest++; 1137 cp++; 1138 } else 1139 dest++; 1140 if (dest == ep) 1141 return *cp == '\0' ? 0 : ENAMETOOLONG; 1142 switch (*cp) { 1143 case ':': 1144 case '-': 1145 case '.': 1146 cp++; 1147 break; 1148 } 1149 } 1150 return ENOBUFS; 1151 } 1152 1153 /* 1154 * Convert a sockaddr into an Ethernet address or range of Ethernet 1155 * addresses. 1156 */ 1157 int 1158 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1159 uint8_t addrhi[ETHER_ADDR_LEN]) 1160 { 1161 #ifdef INET 1162 const struct sockaddr_in *sin; 1163 #endif /* INET */ 1164 #ifdef INET6 1165 const struct sockaddr_in6 *sin6; 1166 #endif /* INET6 */ 1167 1168 switch (sa->sa_family) { 1169 1170 case AF_UNSPEC: 1171 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1172 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1173 break; 1174 1175 #ifdef INET 1176 case AF_INET: 1177 sin = satocsin(sa); 1178 if (sin->sin_addr.s_addr == INADDR_ANY) { 1179 /* 1180 * An IP address of INADDR_ANY means listen to 1181 * or stop listening to all of the Ethernet 1182 * multicast addresses used for IP. 1183 * (This is for the sake of IP multicast routers.) 1184 */ 1185 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1186 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1187 } 1188 else { 1189 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1190 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1191 } 1192 break; 1193 #endif 1194 #ifdef INET6 1195 case AF_INET6: 1196 sin6 = satocsin6(sa); 1197 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1198 /* 1199 * An IP6 address of 0 means listen to or stop 1200 * listening to all of the Ethernet multicast 1201 * address used for IP6. 1202 * (This is used for multicast routers.) 1203 */ 1204 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1205 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1206 } else { 1207 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1208 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1209 } 1210 break; 1211 #endif 1212 1213 default: 1214 return EAFNOSUPPORT; 1215 } 1216 return 0; 1217 } 1218 1219 /* 1220 * Add an Ethernet multicast address or range of addresses to the list for a 1221 * given interface. 1222 */ 1223 int 1224 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1225 { 1226 struct ether_multi *enm; 1227 u_char addrlo[ETHER_ADDR_LEN]; 1228 u_char addrhi[ETHER_ADDR_LEN]; 1229 int s = splnet(), error; 1230 1231 error = ether_multiaddr(sa, addrlo, addrhi); 1232 if (error != 0) { 1233 splx(s); 1234 return error; 1235 } 1236 1237 /* 1238 * Verify that we have valid Ethernet multicast addresses. 1239 */ 1240 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1241 splx(s); 1242 return EINVAL; 1243 } 1244 /* 1245 * See if the address range is already in the list. 1246 */ 1247 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1248 if (enm != NULL) { 1249 /* 1250 * Found it; just increment the reference count. 1251 */ 1252 ++enm->enm_refcount; 1253 splx(s); 1254 return 0; 1255 } 1256 /* 1257 * New address or range; malloc a new multicast record 1258 * and link it into the interface's multicast list. 1259 */ 1260 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1261 if (enm == NULL) { 1262 splx(s); 1263 return ENOBUFS; 1264 } 1265 memcpy(enm->enm_addrlo, addrlo, 6); 1266 memcpy(enm->enm_addrhi, addrhi, 6); 1267 enm->enm_refcount = 1; 1268 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1269 ec->ec_multicnt++; 1270 splx(s); 1271 /* 1272 * Return ENETRESET to inform the driver that the list has changed 1273 * and its reception filter should be adjusted accordingly. 1274 */ 1275 return ENETRESET; 1276 } 1277 1278 /* 1279 * Delete a multicast address record. 1280 */ 1281 int 1282 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1283 { 1284 struct ether_multi *enm; 1285 u_char addrlo[ETHER_ADDR_LEN]; 1286 u_char addrhi[ETHER_ADDR_LEN]; 1287 int s = splnet(), error; 1288 1289 error = ether_multiaddr(sa, addrlo, addrhi); 1290 if (error != 0) { 1291 splx(s); 1292 return (error); 1293 } 1294 1295 /* 1296 * Look ur the address in our list. 1297 */ 1298 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1299 if (enm == NULL) { 1300 splx(s); 1301 return (ENXIO); 1302 } 1303 if (--enm->enm_refcount != 0) { 1304 /* 1305 * Still some claims to this record. 1306 */ 1307 splx(s); 1308 return (0); 1309 } 1310 /* 1311 * No remaining claims to this record; unlink and free it. 1312 */ 1313 LIST_REMOVE(enm, enm_list); 1314 free(enm, M_IFMADDR); 1315 ec->ec_multicnt--; 1316 splx(s); 1317 /* 1318 * Return ENETRESET to inform the driver that the list has changed 1319 * and its reception filter should be adjusted accordingly. 1320 */ 1321 return (ENETRESET); 1322 } 1323 1324 void 1325 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1326 { 1327 ec->ec_ifflags_cb = cb; 1328 } 1329 1330 /* 1331 * Common ioctls for Ethernet interfaces. Note, we must be 1332 * called at splnet(). 1333 */ 1334 int 1335 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1336 { 1337 struct ethercom *ec = (void *) ifp; 1338 struct eccapreq *eccr; 1339 struct ifreq *ifr = (struct ifreq *)data; 1340 struct if_laddrreq *iflr = data; 1341 const struct sockaddr_dl *sdl; 1342 static const uint8_t zero[ETHER_ADDR_LEN]; 1343 int error; 1344 1345 switch (cmd) { 1346 case SIOCINITIFADDR: 1347 { 1348 struct ifaddr *ifa = (struct ifaddr *)data; 1349 if (ifa->ifa_addr->sa_family != AF_LINK 1350 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1351 (IFF_UP|IFF_RUNNING)) { 1352 ifp->if_flags |= IFF_UP; 1353 if ((error = (*ifp->if_init)(ifp)) != 0) 1354 return error; 1355 } 1356 #ifdef INET 1357 if (ifa->ifa_addr->sa_family == AF_INET) 1358 arp_ifinit(ifp, ifa); 1359 #endif /* INET */ 1360 return 0; 1361 } 1362 1363 case SIOCSIFMTU: 1364 { 1365 int maxmtu; 1366 1367 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1368 maxmtu = ETHERMTU_JUMBO; 1369 else 1370 maxmtu = ETHERMTU; 1371 1372 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1373 return EINVAL; 1374 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1375 return error; 1376 else if (ifp->if_flags & IFF_UP) { 1377 /* Make sure the device notices the MTU change. */ 1378 return (*ifp->if_init)(ifp); 1379 } else 1380 return 0; 1381 } 1382 1383 case SIOCSIFFLAGS: 1384 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1385 return error; 1386 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1387 case IFF_RUNNING: 1388 /* 1389 * If interface is marked down and it is running, 1390 * then stop and disable it. 1391 */ 1392 (*ifp->if_stop)(ifp, 1); 1393 break; 1394 case IFF_UP: 1395 /* 1396 * If interface is marked up and it is stopped, then 1397 * start it. 1398 */ 1399 return (*ifp->if_init)(ifp); 1400 case IFF_UP|IFF_RUNNING: 1401 error = 0; 1402 if (ec->ec_ifflags_cb == NULL || 1403 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1404 /* 1405 * Reset the interface to pick up 1406 * changes in any other flags that 1407 * affect the hardware state. 1408 */ 1409 return (*ifp->if_init)(ifp); 1410 } else 1411 return error; 1412 case 0: 1413 break; 1414 } 1415 return 0; 1416 case SIOCGETHERCAP: 1417 eccr = (struct eccapreq *)data; 1418 eccr->eccr_capabilities = ec->ec_capabilities; 1419 eccr->eccr_capenable = ec->ec_capenable; 1420 return 0; 1421 case SIOCADDMULTI: 1422 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1423 case SIOCDELMULTI: 1424 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1425 case SIOCSIFMEDIA: 1426 case SIOCGIFMEDIA: 1427 if (ec->ec_mii == NULL) 1428 return ENOTTY; 1429 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1430 case SIOCALIFADDR: 1431 sdl = satocsdl(sstocsa(&iflr->addr)); 1432 if (sdl->sdl_family != AF_LINK) 1433 ; 1434 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1435 return EINVAL; 1436 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1437 return EINVAL; 1438 /*FALLTHROUGH*/ 1439 default: 1440 return ifioctl_common(ifp, cmd, data); 1441 } 1442 return 0; 1443 } 1444 1445 /* 1446 * Enable/disable passing VLAN packets if the parent interface supports it. 1447 * Return: 1448 * 0: Ok 1449 * -1: Parent interface does not support vlans 1450 * >0: Error 1451 */ 1452 int 1453 ether_enable_vlan_mtu(struct ifnet *ifp) 1454 { 1455 int error; 1456 struct ethercom *ec = (void *)ifp; 1457 1458 /* Already have VLAN's do nothing. */ 1459 if (ec->ec_nvlans != 0) 1460 return 0; 1461 1462 /* Parent does not support VLAN's */ 1463 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) 1464 return -1; 1465 1466 /* 1467 * Parent supports the VLAN_MTU capability, 1468 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; 1469 * enable it. 1470 */ 1471 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1472 1473 /* Interface is down, defer for later */ 1474 if ((ifp->if_flags & IFF_UP) == 0) 1475 return 0; 1476 1477 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1478 return 0; 1479 1480 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1481 return error; 1482 } 1483 1484 int 1485 ether_disable_vlan_mtu(struct ifnet *ifp) 1486 { 1487 int error; 1488 struct ethercom *ec = (void *)ifp; 1489 1490 /* We still have VLAN's, defer for later */ 1491 if (ec->ec_nvlans != 0) 1492 return 0; 1493 1494 /* Parent does not support VLAB's, nothing to do. */ 1495 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) 1496 return -1; 1497 1498 /* 1499 * Disable Tx/Rx of VLAN-sized frames. 1500 */ 1501 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1502 1503 /* Interface is down, defer for later */ 1504 if ((ifp->if_flags & IFF_UP) == 0) 1505 return 0; 1506 1507 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1508 return 0; 1509 1510 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1511 return error; 1512 } 1513 1514 static int 1515 ether_multicast_sysctl(SYSCTLFN_ARGS) 1516 { 1517 struct ether_multi *enm; 1518 struct ether_multi_sysctl addr; 1519 struct ifnet *ifp; 1520 struct ethercom *ec; 1521 int error = 0; 1522 size_t written; 1523 struct psref psref; 1524 int bound; 1525 1526 if (namelen != 1) 1527 return EINVAL; 1528 1529 bound = curlwp_bind(); 1530 ifp = if_get_byindex(name[0], &psref); 1531 if (ifp == NULL) { 1532 error = ENODEV; 1533 goto out; 1534 } 1535 if (ifp->if_type != IFT_ETHER) { 1536 if_put(ifp, &psref); 1537 *oldlenp = 0; 1538 goto out; 1539 } 1540 ec = (struct ethercom *)ifp; 1541 1542 if (oldp == NULL) { 1543 if_put(ifp, &psref); 1544 *oldlenp = ec->ec_multicnt * sizeof(addr); 1545 goto out; 1546 } 1547 1548 memset(&addr, 0, sizeof(addr)); 1549 error = 0; 1550 written = 0; 1551 1552 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1553 if (written + sizeof(addr) > *oldlenp) 1554 break; 1555 addr.enm_refcount = enm->enm_refcount; 1556 memcpy(addr.enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1557 memcpy(addr.enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1558 error = sysctl_copyout(l, &addr, oldp, sizeof(addr)); 1559 if (error) 1560 break; 1561 written += sizeof(addr); 1562 oldp = (char *)oldp + sizeof(addr); 1563 } 1564 if_put(ifp, &psref); 1565 1566 *oldlenp = written; 1567 out: 1568 curlwp_bindx(bound); 1569 return error; 1570 } 1571 1572 SYSCTL_SETUP(sysctl_net_ether_setup, "sysctl net.ether subtree setup") 1573 { 1574 const struct sysctlnode *rnode = NULL; 1575 1576 sysctl_createv(clog, 0, NULL, &rnode, 1577 CTLFLAG_PERMANENT, 1578 CTLTYPE_NODE, "ether", 1579 SYSCTL_DESCR("Ethernet-specific information"), 1580 NULL, 0, NULL, 0, 1581 CTL_NET, CTL_CREATE, CTL_EOL); 1582 1583 sysctl_createv(clog, 0, &rnode, NULL, 1584 CTLFLAG_PERMANENT, 1585 CTLTYPE_NODE, "multicast", 1586 SYSCTL_DESCR("multicast addresses"), 1587 ether_multicast_sysctl, 0, NULL, 0, 1588 CTL_CREATE, CTL_EOL); 1589 } 1590 1591 void 1592 etherinit(void) 1593 { 1594 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); 1595 } 1596
Indexes created Tue Sep 23 07:09:52 GMT 2025