if_ethersubr.c revision 1.314
1/* $NetBSD: if_ethersubr.c,v 1.314 2022/06/20 08:20:09 yamaguchi 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 1.314 2022/06/20 08:20:09 yamaguchi 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/mbuf.h> 84#include <sys/mutex.h> 85#include <sys/ioctl.h> 86#include <sys/errno.h> 87#include <sys/device.h> 88#include <sys/entropy.h> 89#include <sys/rndsource.h> 90#include <sys/cpu.h> 91#include <sys/kmem.h> 92#include <sys/hook.h> 93 94#include <net/if.h> 95#include <net/netisr.h> 96#include <net/route.h> 97#include <net/if_llc.h> 98#include <net/if_dl.h> 99#include <net/if_types.h> 100#include <net/pktqueue.h> 101 102#include <net/if_media.h> 103#include <dev/mii/mii.h> 104#include <dev/mii/miivar.h> 105 106#if NARP == 0 107/* 108 * XXX there should really be a way to issue this warning from within config(8) 109 */ 110#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. 111#endif 112 113#include <net/bpf.h> 114 115#include <net/if_ether.h> 116#include <net/if_vlanvar.h> 117 118#if NPPPOE > 0 119#include <net/if_pppoe.h> 120#endif 121 122#if NAGR > 0 123#include <net/ether_slowprotocols.h> 124#include <net/agr/ieee8023ad.h> 125#include <net/agr/if_agrvar.h> 126#endif 127 128#if NBRIDGE > 0 129#include <net/if_bridgevar.h> 130#endif 131 132#include <netinet/in.h> 133#ifdef INET 134#include <netinet/in_var.h> 135#endif 136#include <netinet/if_inarp.h> 137 138#ifdef INET6 139#ifndef INET 140#include <netinet/in.h> 141#endif 142#include <netinet6/in6_var.h> 143#include <netinet6/nd6.h> 144#endif 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 159extern u_char at_org_code[3]; 160extern 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 168CTASSERT(sizeof(struct ether_addr) == 6); 169CTASSERT(sizeof(struct ether_header) == 14); 170 171#ifdef DIAGNOSTIC 172static struct timeval bigpktppslim_last; 173static int bigpktppslim = 2; /* XXX */ 174static int bigpktpps_count; 175static kmutex_t bigpktpps_lock __cacheline_aligned; 176#endif 177 178const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 179 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 180const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 181 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 182#define senderr(e) { error = (e); goto bad;} 183 184static pktq_rps_hash_func_t ether_pktq_rps_hash_p; 185 186static int ether_output(struct ifnet *, struct mbuf *, 187 const struct sockaddr *, const 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 */ 194static int 195ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 196 const struct sockaddr * const dst, const struct rtentry *rt) 197{ 198 uint8_t esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 199 uint16_t etype = 0; 200 int error = 0, hdrcmplt = 0; 201 struct mbuf *m = m0; 202 struct mbuf *mcopy = NULL; 203 struct ether_header *eh; 204 struct ifnet *ifp = ifp0; 205#ifdef INET 206 struct arphdr *ah; 207#endif 208#ifdef NETATALK 209 struct at_ifaddr *aa; 210#endif 211 212#ifdef MBUFTRACE 213 m_claimm(m, ifp->if_mowner); 214#endif 215 216#if NCARP > 0 217 if (ifp->if_type == IFT_CARP) { 218 struct ifaddr *ifa; 219 int s = pserialize_read_enter(); 220 221 /* loop back if this is going to the carp interface */ 222 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 223 (ifa = ifa_ifwithaddr(dst)) != NULL) { 224 if (ifa->ifa_ifp == ifp0) { 225 pserialize_read_exit(s); 226 return looutput(ifp0, m, dst, rt); 227 } 228 } 229 pserialize_read_exit(s); 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 239 240 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 241 senderr(ENETDOWN); 242 243 switch (dst->sa_family) { 244 245#ifdef INET 246 case AF_INET: 247 if (m->m_flags & M_BCAST) { 248 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 249 } else if (m->m_flags & M_MCAST) { 250 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 251 } else { 252 error = arpresolve(ifp0, rt, m, dst, edst, sizeof(edst)); 253 if (error) 254 return (error == EWOULDBLOCK) ? 0 : error; 255 } 256 /* If broadcasting on a simplex interface, loopback a copy */ 257 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 258 mcopy = m_copypacket(m, M_DONTWAIT); 259 etype = htons(ETHERTYPE_IP); 260 break; 261 262 case AF_ARP: 263 ah = mtod(m, struct arphdr *); 264 if (m->m_flags & M_BCAST) { 265 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 266 } else { 267 void *tha = ar_tha(ah); 268 269 if (tha == NULL) { 270 /* fake with ARPHRD_IEEE1394 */ 271 m_freem(m); 272 return 0; 273 } 274 memcpy(edst, tha, sizeof(edst)); 275 } 276 277 ah->ar_hrd = htons(ARPHRD_ETHER); 278 279 switch (ntohs(ah->ar_op)) { 280 case ARPOP_REVREQUEST: 281 case ARPOP_REVREPLY: 282 etype = htons(ETHERTYPE_REVARP); 283 break; 284 285 case ARPOP_REQUEST: 286 case ARPOP_REPLY: 287 default: 288 etype = htons(ETHERTYPE_ARP); 289 } 290 break; 291#endif 292 293#ifdef INET6 294 case AF_INET6: 295 if (m->m_flags & M_BCAST) { 296 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 297 } else if (m->m_flags & M_MCAST) { 298 ETHER_MAP_IPV6_MULTICAST(&satocsin6(dst)->sin6_addr, 299 edst); 300 } else { 301 error = nd6_resolve(ifp0, rt, m, dst, edst, 302 sizeof(edst)); 303 if (error) 304 return (error == EWOULDBLOCK) ? 0 : error; 305 } 306 etype = htons(ETHERTYPE_IPV6); 307 break; 308#endif 309 310#ifdef NETATALK 311 case AF_APPLETALK: { 312 struct ifaddr *ifa; 313 int s; 314 315 KERNEL_LOCK(1, NULL); 316 317 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 318 KERNEL_UNLOCK_ONE(NULL); 319 return 0; 320 } 321 322 /* 323 * ifaddr is the first thing in at_ifaddr 324 */ 325 s = pserialize_read_enter(); 326 ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); 327 if (ifa == NULL) { 328 pserialize_read_exit(s); 329 KERNEL_UNLOCK_ONE(NULL); 330 senderr(EADDRNOTAVAIL); 331 } 332 aa = (struct at_ifaddr *)ifa; 333 334 /* 335 * In the phase 2 case, we need to prepend an mbuf for the 336 * llc header. 337 */ 338 if (aa->aa_flags & AFA_PHASE2) { 339 struct llc llc; 340 341 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 342 if (m == NULL) { 343 pserialize_read_exit(s); 344 KERNEL_UNLOCK_ONE(NULL); 345 senderr(ENOBUFS); 346 } 347 348 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 349 llc.llc_control = LLC_UI; 350 memcpy(llc.llc_snap_org_code, at_org_code, 351 sizeof(llc.llc_snap_org_code)); 352 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 353 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 354 } else { 355 etype = htons(ETHERTYPE_ATALK); 356 } 357 pserialize_read_exit(s); 358 KERNEL_UNLOCK_ONE(NULL); 359 break; 360 } 361#endif /* NETATALK */ 362 363 case pseudo_AF_HDRCMPLT: 364 hdrcmplt = 1; 365 memcpy(esrc, 366 ((const struct ether_header *)dst->sa_data)->ether_shost, 367 sizeof(esrc)); 368 /* FALLTHROUGH */ 369 370 case AF_UNSPEC: 371 memcpy(edst, 372 ((const struct ether_header *)dst->sa_data)->ether_dhost, 373 sizeof(edst)); 374 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 375 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 376 break; 377 378 default: 379 printf("%s: can't handle af%d\n", ifp->if_xname, 380 dst->sa_family); 381 senderr(EAFNOSUPPORT); 382 } 383 384#ifdef MPLS 385 { 386 struct m_tag *mtag; 387 mtag = m_tag_find(m, PACKET_TAG_MPLS); 388 if (mtag != NULL) { 389 /* Having the tag itself indicates it's MPLS */ 390 etype = htons(ETHERTYPE_MPLS); 391 m_tag_delete(m, mtag); 392 } 393 } 394#endif 395 396 if (mcopy) 397 (void)looutput(ifp, mcopy, dst, rt); 398 399 KASSERT((m->m_flags & M_PKTHDR) != 0); 400 401 /* 402 * If no ether type is set, this must be a 802.2 formatted packet. 403 */ 404 if (etype == 0) 405 etype = htons(m->m_pkthdr.len); 406 407 /* 408 * Add local net header. If no space in first mbuf, allocate another. 409 */ 410 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 411 if (m == NULL) 412 senderr(ENOBUFS); 413 414 eh = mtod(m, struct ether_header *); 415 /* Note: etype is already in network byte order. */ 416 memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 417 memcpy(eh->ether_dhost, edst, sizeof(edst)); 418 if (hdrcmplt) { 419 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 420 } else { 421 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 422 sizeof(eh->ether_shost)); 423 } 424 425#if NCARP > 0 426 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 427 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 428 sizeof(eh->ether_shost)); 429 } 430#endif 431 432 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 433 return error; 434 if (m == NULL) 435 return 0; 436 437#if NBRIDGE > 0 438 /* 439 * Bridges require special output handling. 440 */ 441 if (ifp->if_bridge) 442 return bridge_output(ifp, m, NULL, NULL); 443#endif 444 445#if NCARP > 0 446 if (ifp != ifp0) 447 if_statadd(ifp0, if_obytes, m->m_pkthdr.len + ETHER_HDR_LEN); 448#endif 449 450#ifdef ALTQ 451 KERNEL_LOCK(1, NULL); 452 /* 453 * If ALTQ is enabled on the parent interface, do 454 * classification; the queueing discipline might not 455 * require classification, but might require the 456 * address family/header pointer in the pktattr. 457 */ 458 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 459 altq_etherclassify(&ifp->if_snd, m); 460 KERNEL_UNLOCK_ONE(NULL); 461#endif 462 return ifq_enqueue(ifp, m); 463 464bad: 465 if_statinc(ifp, if_oerrors); 466 if (m) 467 m_freem(m); 468 return error; 469} 470 471#ifdef ALTQ 472/* 473 * This routine is a slight hack to allow a packet to be classified 474 * if the Ethernet headers are present. It will go away when ALTQ's 475 * classification engine understands link headers. 476 * 477 * XXX: We may need to do m_pullups here. First to ensure struct ether_header 478 * is indeed contiguous, then to read the LLC and so on. 479 */ 480void 481altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) 482{ 483 struct ether_header *eh; 484 struct mbuf *mtop = m; 485 uint16_t ether_type; 486 int hlen, af, hdrsize; 487 void *hdr; 488 489 KASSERT((mtop->m_flags & M_PKTHDR) != 0); 490 491 hlen = ETHER_HDR_LEN; 492 eh = mtod(m, struct ether_header *); 493 494 ether_type = htons(eh->ether_type); 495 496 if (ether_type < ETHERMTU) { 497 /* LLC/SNAP */ 498 struct llc *llc = (struct llc *)(eh + 1); 499 hlen += 8; 500 501 if (m->m_len < hlen || 502 llc->llc_dsap != LLC_SNAP_LSAP || 503 llc->llc_ssap != LLC_SNAP_LSAP || 504 llc->llc_control != LLC_UI) { 505 /* Not SNAP. */ 506 goto bad; 507 } 508 509 ether_type = htons(llc->llc_un.type_snap.ether_type); 510 } 511 512 switch (ether_type) { 513 case ETHERTYPE_IP: 514 af = AF_INET; 515 hdrsize = 20; /* sizeof(struct ip) */ 516 break; 517 518 case ETHERTYPE_IPV6: 519 af = AF_INET6; 520 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 521 break; 522 523 default: 524 af = AF_UNSPEC; 525 hdrsize = 0; 526 break; 527 } 528 529 while (m->m_len <= hlen) { 530 hlen -= m->m_len; 531 m = m->m_next; 532 if (m == NULL) 533 goto bad; 534 } 535 536 if (m->m_len < (hlen + hdrsize)) { 537 /* 538 * protocol header not in a single mbuf. 539 * We can't cope with this situation right 540 * now (but it shouldn't ever happen, really, anyhow). 541 */ 542#ifdef DEBUG 543 printf("altq_etherclassify: headers span multiple mbufs: " 544 "%d < %d\n", m->m_len, (hlen + hdrsize)); 545#endif 546 goto bad; 547 } 548 549 m->m_data += hlen; 550 m->m_len -= hlen; 551 552 hdr = mtod(m, void *); 553 554 if (ALTQ_NEEDS_CLASSIFY(ifq)) { 555 mtop->m_pkthdr.pattr_class = 556 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 557 } 558 mtop->m_pkthdr.pattr_af = af; 559 mtop->m_pkthdr.pattr_hdr = hdr; 560 561 m->m_data -= hlen; 562 m->m_len += hlen; 563 564 return; 565 566bad: 567 mtop->m_pkthdr.pattr_class = NULL; 568 mtop->m_pkthdr.pattr_hdr = NULL; 569 mtop->m_pkthdr.pattr_af = AF_UNSPEC; 570} 571#endif /* ALTQ */ 572 573#if defined (LLC) || defined (NETATALK) 574static void 575ether_input_llc(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh) 576{ 577 struct ifqueue *inq = NULL; 578 int isr = 0; 579 struct llc *l; 580 581 if (m->m_len < sizeof(*eh) + sizeof(struct llc)) 582 goto error; 583 584 l = (struct llc *)(eh+1); 585 switch (l->llc_dsap) { 586#ifdef NETATALK 587 case LLC_SNAP_LSAP: 588 switch (l->llc_control) { 589 case LLC_UI: 590 if (l->llc_ssap != LLC_SNAP_LSAP) 591 goto error; 592 593 if (memcmp(&(l->llc_snap_org_code)[0], 594 at_org_code, sizeof(at_org_code)) == 0 && 595 ntohs(l->llc_snap_ether_type) == 596 ETHERTYPE_ATALK) { 597 inq = &atintrq2; 598 m_adj(m, sizeof(struct ether_header) 599 + sizeof(struct llc)); 600 isr = NETISR_ATALK; 601 break; 602 } 603 604 if (memcmp(&(l->llc_snap_org_code)[0], 605 aarp_org_code, 606 sizeof(aarp_org_code)) == 0 && 607 ntohs(l->llc_snap_ether_type) == 608 ETHERTYPE_AARP) { 609 m_adj(m, sizeof(struct ether_header) 610 + sizeof(struct llc)); 611 aarpinput(ifp, m); /* XXX queue? */ 612 return; 613 } 614 615 default: 616 goto error; 617 } 618 break; 619#endif 620 default: 621 goto noproto; 622 } 623 624 KASSERT(inq != NULL); 625 IFQ_ENQUEUE_ISR(inq, m, isr); 626 return; 627 628noproto: 629 m_freem(m); 630 if_statinc(ifp, if_noproto); 631 return; 632error: 633 m_freem(m); 634 if_statinc(ifp, if_ierrors); 635 return; 636} 637#endif /* defined (LLC) || defined (NETATALK) */ 638 639/* 640 * Process a received Ethernet packet; 641 * the packet is in the mbuf chain m with 642 * the ether header. 643 */ 644void 645ether_input(struct ifnet *ifp, struct mbuf *m) 646{ 647 struct ethercom *ec = (struct ethercom *) ifp; 648 pktqueue_t *pktq = NULL; 649 struct ifqueue *inq = NULL; 650 uint16_t etype; 651 struct ether_header *eh; 652 size_t ehlen; 653 static int earlypkts; 654 int isr = 0; 655 656 KASSERT(!cpu_intr_p()); 657 KASSERT((m->m_flags & M_PKTHDR) != 0); 658 659 if ((ifp->if_flags & IFF_UP) == 0) 660 goto drop; 661 662#ifdef MBUFTRACE 663 m_claimm(m, &ec->ec_rx_mowner); 664#endif 665 666 if (__predict_false(m->m_len < sizeof(*eh))) { 667 if ((m = m_pullup(m, sizeof(*eh))) == NULL) { 668 if_statinc(ifp, if_ierrors); 669 return; 670 } 671 } 672 673 eh = mtod(m, struct ether_header *); 674 etype = ntohs(eh->ether_type); 675 ehlen = sizeof(*eh); 676 677 if (__predict_false(earlypkts < 100 || 678 entropy_epoch() == (unsigned)-1)) { 679 rnd_add_data(NULL, eh, ehlen, 0); 680 earlypkts++; 681 } 682 683 /* 684 * Determine if the packet is within its size limits. For MPLS the 685 * header length is variable, so we skip the check. 686 */ 687 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 688 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 689#ifdef DIAGNOSTIC 690 mutex_enter(&bigpktpps_lock); 691 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 692 bigpktppslim)) { 693 printf("%s: discarding oversize frame (len=%d)\n", 694 ifp->if_xname, m->m_pkthdr.len); 695 } 696 mutex_exit(&bigpktpps_lock); 697#endif 698 goto error; 699 } 700 701 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 702 /* 703 * If this is not a simplex interface, drop the packet 704 * if it came from us. 705 */ 706 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 707 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 708 ETHER_ADDR_LEN) == 0) { 709 goto drop; 710 } 711 712 if (memcmp(etherbroadcastaddr, 713 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 714 m->m_flags |= M_BCAST; 715 else 716 m->m_flags |= M_MCAST; 717 if_statinc(ifp, if_imcasts); 718 } 719 720 /* If the CRC is still on the packet, trim it off. */ 721 if (m->m_flags & M_HASFCS) { 722 m_adj(m, -ETHER_CRC_LEN); 723 m->m_flags &= ~M_HASFCS; 724 } 725 726 if_statadd(ifp, if_ibytes, m->m_pkthdr.len); 727 728 if (!vlan_has_tag(m) && etype == ETHERTYPE_VLAN) { 729 m = ether_strip_vlantag(m); 730 if (m == NULL) { 731 if_statinc(ifp, if_ierrors); 732 return; 733 } 734 735 eh = mtod(m, struct ether_header *); 736 etype = ntohs(eh->ether_type); 737 ehlen = sizeof(*eh); 738 } 739 740 if ((m->m_flags & (M_BCAST | M_MCAST | M_PROMISC)) == 0 && 741 (ifp->if_flags & IFF_PROMISC) != 0 && 742 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 743 ETHER_ADDR_LEN) != 0) { 744 m->m_flags |= M_PROMISC; 745 } 746 747 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 } 756 757 /* 758 * Processing a logical interfaces that are able 759 * to configure vlan(4). 760 */ 761#if NAGR > 0 762 if (ifp->if_lagg != NULL && 763 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 764 m->m_flags &= ~M_PROMISC; 765 agr_input(ifp, m); 766 return; 767 } 768#endif 769 770 /* 771 * VLAN processing. 772 * 773 * VLAN provides service delimiting so the frames are 774 * processed before other handlings. If a VLAN interface 775 * does not exist to take those frames, they're returned 776 * to ether_input(). 777 */ 778 779 if (vlan_has_tag(m)) { 780 if (EVL_VLANOFTAG(vlan_get_tag(m)) == 0) { 781 if (etype == ETHERTYPE_VLAN || 782 etype == ETHERTYPE_QINQ) 783 goto drop; 784 785 /* XXX we should actually use the prio value? */ 786 m->m_flags &= ~M_VLANTAG; 787 } else { 788#if NVLAN > 0 789 if (ec->ec_nvlans > 0) { 790 m = vlan_input(ifp, m); 791 792 /* vlan_input() called ether_input() recursively */ 793 if (m == NULL) 794 return; 795 } 796#endif 797 /* drop VLAN frames not for this port. */ 798 goto noproto; 799 } 800 } 801 802#if NCARP > 0 803 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 804 /* 805 * Clear M_PROMISC, in case the packet comes from a 806 * vlan. 807 */ 808 m->m_flags &= ~M_PROMISC; 809 if (carp_input(m, (uint8_t *)&eh->ether_shost, 810 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 811 return; 812 } 813#endif 814 815 /* 816 * Handle protocols that expect to have the Ethernet header 817 * (and possibly FCS) intact. 818 */ 819 switch (etype) { 820#if NPPPOE > 0 821 case ETHERTYPE_PPPOEDISC: 822 pppoedisc_input(ifp, m); 823 return; 824 825 case ETHERTYPE_PPPOE: 826 pppoe_input(ifp, m); 827 return; 828#endif 829 830 case ETHERTYPE_SLOWPROTOCOLS: { 831 uint8_t subtype; 832 833 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) 834 goto error; 835 836 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 837 switch (subtype) { 838#if NAGR > 0 839 case SLOWPROTOCOLS_SUBTYPE_LACP: 840 if (ifp->if_lagg != NULL) { 841 ieee8023ad_lacp_input(ifp, m); 842 return; 843 } 844 break; 845 846 case SLOWPROTOCOLS_SUBTYPE_MARKER: 847 if (ifp->if_lagg != NULL) { 848 ieee8023ad_marker_input(ifp, m); 849 return; 850 } 851 break; 852#endif 853 854 default: 855 if (subtype == 0 || subtype > 10) { 856 /* illegal value */ 857 goto error; 858 } 859 /* unknown subtype */ 860 break; 861 } 862 } 863 /* FALLTHROUGH */ 864 default: 865 if (m->m_flags & M_PROMISC) 866 goto drop; 867 } 868 869 /* If the CRC is still on the packet, trim it off. */ 870 if (m->m_flags & M_HASFCS) { 871 m_adj(m, -ETHER_CRC_LEN); 872 m->m_flags &= ~M_HASFCS; 873 } 874 875 /* etype represents the size of the payload in this case */ 876 if (etype <= ETHERMTU + sizeof(struct ether_header)) { 877 KASSERT(ehlen == sizeof(*eh)); 878#if defined (LLC) || defined (NETATALK) 879 ether_input_llc(ifp, m, eh); 880 return; 881#else 882 /* ethertype of 0-1500 is regarded as noproto */ 883 goto noproto; 884#endif 885 } 886 887 /* Strip off the Ethernet header. */ 888 m_adj(m, ehlen); 889 890 switch (etype) { 891#ifdef INET 892 case ETHERTYPE_IP: 893#ifdef GATEWAY 894 if (ipflow_fastforward(m)) 895 return; 896#endif 897 pktq = ip_pktq; 898 break; 899 900 case ETHERTYPE_ARP: 901 isr = NETISR_ARP; 902 inq = &arpintrq; 903 break; 904 905 case ETHERTYPE_REVARP: 906 revarpinput(m); /* XXX queue? */ 907 return; 908#endif 909 910#ifdef INET6 911 case ETHERTYPE_IPV6: 912 if (__predict_false(!in6_present)) 913 goto noproto; 914#ifdef GATEWAY 915 if (ip6flow_fastforward(&m)) 916 return; 917#endif 918 pktq = ip6_pktq; 919 break; 920#endif 921 922#ifdef NETATALK 923 case ETHERTYPE_ATALK: 924 isr = NETISR_ATALK; 925 inq = &atintrq1; 926 break; 927 928 case ETHERTYPE_AARP: 929 aarpinput(ifp, m); /* XXX queue? */ 930 return; 931#endif 932 933#ifdef MPLS 934 case ETHERTYPE_MPLS: 935 isr = NETISR_MPLS; 936 inq = &mplsintrq; 937 break; 938#endif 939 940 default: 941 goto noproto; 942 } 943 944 if (__predict_true(pktq)) { 945 const uint32_t h = pktq_rps_hash(ðer_pktq_rps_hash_p, m); 946 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 947 m_freem(m); 948 } 949 return; 950 } 951 952 if (__predict_false(!inq)) { 953 /* Should not happen. */ 954 goto error; 955 } 956 957 IFQ_ENQUEUE_ISR(inq, m, isr); 958 return; 959 960drop: 961 m_freem(m); 962 if_statinc(ifp, if_iqdrops); 963 return; 964noproto: 965 m_freem(m); 966 if_statinc(ifp, if_noproto); 967 return; 968error: 969 m_freem(m); 970 if_statinc(ifp, if_ierrors); 971 return; 972} 973 974static void 975ether_bpf_mtap(struct bpf_if *bp, struct mbuf *m, u_int direction) 976{ 977 struct ether_vlan_header evl; 978 struct m_hdr mh, md; 979 980 KASSERT(bp != NULL); 981 982 if (!vlan_has_tag(m)) { 983 bpf_mtap3(bp, m, direction); 984 return; 985 } 986 987 memcpy(&evl, mtod(m, char *), ETHER_HDR_LEN); 988 evl.evl_proto = evl.evl_encap_proto; 989 evl.evl_encap_proto = htons(ETHERTYPE_VLAN); 990 evl.evl_tag = htons(vlan_get_tag(m)); 991 992 md.mh_flags = 0; 993 md.mh_data = m->m_data + ETHER_HDR_LEN; 994 md.mh_len = m->m_len - ETHER_HDR_LEN; 995 md.mh_next = m->m_next; 996 997 mh.mh_flags = 0; 998 mh.mh_data = (char *)&evl; 999 mh.mh_len = sizeof(evl); 1000 mh.mh_next = (struct mbuf *)&md; 1001 1002 bpf_mtap3(bp, (struct mbuf *)&mh, direction); 1003} 1004 1005/* 1006 * Convert Ethernet address to printable (loggable) representation. 1007 */ 1008char * 1009ether_sprintf(const u_char *ap) 1010{ 1011 static char etherbuf[3 * ETHER_ADDR_LEN]; 1012 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1013} 1014 1015char * 1016ether_snprintf(char *buf, size_t len, const u_char *ap) 1017{ 1018 char *cp = buf; 1019 size_t i; 1020 1021 for (i = 0; i < len / 3; i++) { 1022 *cp++ = hexdigits[*ap >> 4]; 1023 *cp++ = hexdigits[*ap++ & 0xf]; 1024 *cp++ = ':'; 1025 } 1026 *--cp = '\0'; 1027 return buf; 1028} 1029 1030/* 1031 * Perform common duties while attaching to interface list 1032 */ 1033void 1034ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 1035{ 1036 struct ethercom *ec = (struct ethercom *)ifp; 1037 char xnamebuf[HOOKNAMSIZ]; 1038 1039 ifp->if_type = IFT_ETHER; 1040 ifp->if_hdrlen = ETHER_HDR_LEN; 1041 ifp->if_dlt = DLT_EN10MB; 1042 ifp->if_mtu = ETHERMTU; 1043 ifp->if_output = ether_output; 1044 ifp->_if_input = ether_input; 1045 ifp->if_bpf_mtap = ether_bpf_mtap; 1046 if (ifp->if_baudrate == 0) 1047 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1048 1049 if (lla != NULL) 1050 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1051 1052 LIST_INIT(&ec->ec_multiaddrs); 1053 SIMPLEQ_INIT(&ec->ec_vids); 1054 ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 1055 ec->ec_flags = 0; 1056 ifp->if_broadcastaddr = etherbroadcastaddr; 1057 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1058 snprintf(xnamebuf, sizeof(xnamebuf), 1059 "%s-ether_ifdetachhooks", ifp->if_xname); 1060 ec->ec_ifdetach_hooks = simplehook_create(IPL_NET, xnamebuf); 1061#ifdef MBUFTRACE 1062 mowner_init_owner(&ec->ec_tx_mowner, ifp->if_xname, "tx"); 1063 mowner_init_owner(&ec->ec_rx_mowner, ifp->if_xname, "rx"); 1064 MOWNER_ATTACH(&ec->ec_tx_mowner); 1065 MOWNER_ATTACH(&ec->ec_rx_mowner); 1066 ifp->if_mowner = &ec->ec_tx_mowner; 1067#endif 1068} 1069 1070void 1071ether_ifdetach(struct ifnet *ifp) 1072{ 1073 struct ethercom *ec = (void *) ifp; 1074 struct ether_multi *enm; 1075 1076 IFNET_ASSERT_UNLOCKED(ifp); 1077 /* 1078 * Prevent further calls to ioctl (for example turning off 1079 * promiscuous mode from the bridge code), which eventually can 1080 * call if_init() which can cause panics because the interface 1081 * is in the process of being detached. Return device not configured 1082 * instead. 1083 */ 1084 ifp->if_ioctl = __FPTRCAST(int (*)(struct ifnet *, u_long, void *), 1085 enxio); 1086 1087 simplehook_dohooks(ec->ec_ifdetach_hooks); 1088 KASSERT(!simplehook_has_hooks(ec->ec_ifdetach_hooks)); 1089 simplehook_destroy(ec->ec_ifdetach_hooks); 1090 1091 bpf_detach(ifp); 1092 1093 ETHER_LOCK(ec); 1094 KASSERT(ec->ec_nvlans == 0); 1095 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1096 LIST_REMOVE(enm, enm_list); 1097 kmem_free(enm, sizeof(*enm)); 1098 ec->ec_multicnt--; 1099 } 1100 ETHER_UNLOCK(ec); 1101 1102 mutex_obj_free(ec->ec_lock); 1103 ec->ec_lock = NULL; 1104 1105 ifp->if_mowner = NULL; 1106 MOWNER_DETACH(&ec->ec_rx_mowner); 1107 MOWNER_DETACH(&ec->ec_tx_mowner); 1108} 1109 1110void * 1111ether_ifdetachhook_establish(struct ifnet *ifp, 1112 void (*fn)(void *), void *arg) 1113{ 1114 struct ethercom *ec; 1115 khook_t *hk; 1116 1117 if (ifp->if_type != IFT_ETHER) 1118 return NULL; 1119 1120 ec = (struct ethercom *)ifp; 1121 hk = simplehook_establish(ec->ec_ifdetach_hooks, 1122 fn, arg); 1123 1124 return (void *)hk; 1125} 1126 1127void 1128ether_ifdetachhook_disestablish(struct ifnet *ifp, 1129 void *vhook, kmutex_t *lock) 1130{ 1131 struct ethercom *ec; 1132 1133 if (vhook == NULL) 1134 return; 1135 1136 ec = (struct ethercom *)ifp; 1137 simplehook_disestablish(ec->ec_ifdetach_hooks, vhook, lock); 1138} 1139 1140#if 0 1141/* 1142 * This is for reference. We have a table-driven version 1143 * of the little-endian crc32 generator, which is faster 1144 * than the double-loop. 1145 */ 1146uint32_t 1147ether_crc32_le(const uint8_t *buf, size_t len) 1148{ 1149 uint32_t c, crc, carry; 1150 size_t i, j; 1151 1152 crc = 0xffffffffU; /* initial value */ 1153 1154 for (i = 0; i < len; i++) { 1155 c = buf[i]; 1156 for (j = 0; j < 8; j++) { 1157 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1158 crc >>= 1; 1159 c >>= 1; 1160 if (carry) 1161 crc = (crc ^ ETHER_CRC_POLY_LE); 1162 } 1163 } 1164 1165 return (crc); 1166} 1167#else 1168uint32_t 1169ether_crc32_le(const uint8_t *buf, size_t len) 1170{ 1171 static const uint32_t crctab[] = { 1172 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1173 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1174 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1175 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1176 }; 1177 uint32_t crc; 1178 size_t i; 1179 1180 crc = 0xffffffffU; /* initial value */ 1181 1182 for (i = 0; i < len; i++) { 1183 crc ^= buf[i]; 1184 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1185 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1186 } 1187 1188 return (crc); 1189} 1190#endif 1191 1192uint32_t 1193ether_crc32_be(const uint8_t *buf, size_t len) 1194{ 1195 uint32_t c, crc, carry; 1196 size_t i, j; 1197 1198 crc = 0xffffffffU; /* initial value */ 1199 1200 for (i = 0; i < len; i++) { 1201 c = buf[i]; 1202 for (j = 0; j < 8; j++) { 1203 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1204 crc <<= 1; 1205 c >>= 1; 1206 if (carry) 1207 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1208 } 1209 } 1210 1211 return (crc); 1212} 1213 1214#ifdef INET 1215const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1216 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1217const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1218 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1219#endif 1220#ifdef INET6 1221const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1222 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1223const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1224 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1225#endif 1226 1227/* 1228 * ether_aton implementation, not using a static buffer. 1229 */ 1230int 1231ether_aton_r(u_char *dest, size_t len, const char *str) 1232{ 1233 const u_char *cp = (const void *)str; 1234 u_char *ep; 1235 1236#define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1237 1238 if (len < ETHER_ADDR_LEN) 1239 return ENOSPC; 1240 1241 ep = dest + ETHER_ADDR_LEN; 1242 1243 while (*cp) { 1244 if (!isxdigit(*cp)) 1245 return EINVAL; 1246 1247 *dest = atox(*cp); 1248 cp++; 1249 if (isxdigit(*cp)) { 1250 *dest = (*dest << 4) | atox(*cp); 1251 cp++; 1252 } 1253 dest++; 1254 1255 if (dest == ep) 1256 return (*cp == '\0') ? 0 : ENAMETOOLONG; 1257 1258 switch (*cp) { 1259 case ':': 1260 case '-': 1261 case '.': 1262 cp++; 1263 break; 1264 } 1265 } 1266 return ENOBUFS; 1267} 1268 1269/* 1270 * Convert a sockaddr into an Ethernet address or range of Ethernet 1271 * addresses. 1272 */ 1273int 1274ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1275 uint8_t addrhi[ETHER_ADDR_LEN]) 1276{ 1277#ifdef INET 1278 const struct sockaddr_in *sin; 1279#endif 1280#ifdef INET6 1281 const struct sockaddr_in6 *sin6; 1282#endif 1283 1284 switch (sa->sa_family) { 1285 1286 case AF_UNSPEC: 1287 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1288 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1289 break; 1290 1291#ifdef INET 1292 case AF_INET: 1293 sin = satocsin(sa); 1294 if (sin->sin_addr.s_addr == INADDR_ANY) { 1295 /* 1296 * An IP address of INADDR_ANY means listen to 1297 * or stop listening to all of the Ethernet 1298 * multicast addresses used for IP. 1299 * (This is for the sake of IP multicast routers.) 1300 */ 1301 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1302 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1303 } else { 1304 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1305 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1306 } 1307 break; 1308#endif 1309#ifdef INET6 1310 case AF_INET6: 1311 sin6 = satocsin6(sa); 1312 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1313 /* 1314 * An IP6 address of 0 means listen to or stop 1315 * listening to all of the Ethernet multicast 1316 * address used for IP6. 1317 * (This is used for multicast routers.) 1318 */ 1319 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1320 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1321 } else { 1322 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1323 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1324 } 1325 break; 1326#endif 1327 1328 default: 1329 return EAFNOSUPPORT; 1330 } 1331 return 0; 1332} 1333 1334/* 1335 * Add an Ethernet multicast address or range of addresses to the list for a 1336 * given interface. 1337 */ 1338int 1339ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1340{ 1341 struct ether_multi *enm, *_enm; 1342 u_char addrlo[ETHER_ADDR_LEN]; 1343 u_char addrhi[ETHER_ADDR_LEN]; 1344 int error = 0; 1345 1346 /* Allocate out of lock */ 1347 enm = kmem_alloc(sizeof(*enm), KM_SLEEP); 1348 1349 ETHER_LOCK(ec); 1350 error = ether_multiaddr(sa, addrlo, addrhi); 1351 if (error != 0) 1352 goto out; 1353 1354 /* 1355 * Verify that we have valid Ethernet multicast addresses. 1356 */ 1357 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1358 error = EINVAL; 1359 goto out; 1360 } 1361 1362 /* 1363 * See if the address range is already in the list. 1364 */ 1365 _enm = ether_lookup_multi(addrlo, addrhi, ec); 1366 if (_enm != NULL) { 1367 /* 1368 * Found it; just increment the reference count. 1369 */ 1370 ++_enm->enm_refcount; 1371 error = 0; 1372 goto out; 1373 } 1374 1375 /* 1376 * Link a new multicast record into the interface's multicast list. 1377 */ 1378 memcpy(enm->enm_addrlo, addrlo, ETHER_ADDR_LEN); 1379 memcpy(enm->enm_addrhi, addrhi, ETHER_ADDR_LEN); 1380 enm->enm_refcount = 1; 1381 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1382 ec->ec_multicnt++; 1383 1384 /* 1385 * Return ENETRESET to inform the driver that the list has changed 1386 * and its reception filter should be adjusted accordingly. 1387 */ 1388 error = ENETRESET; 1389 enm = NULL; 1390 1391out: 1392 ETHER_UNLOCK(ec); 1393 if (enm != NULL) 1394 kmem_free(enm, sizeof(*enm)); 1395 return error; 1396} 1397 1398/* 1399 * Delete a multicast address record. 1400 */ 1401int 1402ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1403{ 1404 struct ether_multi *enm; 1405 u_char addrlo[ETHER_ADDR_LEN]; 1406 u_char addrhi[ETHER_ADDR_LEN]; 1407 int error; 1408 1409 ETHER_LOCK(ec); 1410 error = ether_multiaddr(sa, addrlo, addrhi); 1411 if (error != 0) 1412 goto error; 1413 1414 /* 1415 * Look up the address in our list. 1416 */ 1417 enm = ether_lookup_multi(addrlo, addrhi, ec); 1418 if (enm == NULL) { 1419 error = ENXIO; 1420 goto error; 1421 } 1422 if (--enm->enm_refcount != 0) { 1423 /* 1424 * Still some claims to this record. 1425 */ 1426 error = 0; 1427 goto error; 1428 } 1429 1430 /* 1431 * No remaining claims to this record; unlink and free it. 1432 */ 1433 LIST_REMOVE(enm, enm_list); 1434 ec->ec_multicnt--; 1435 ETHER_UNLOCK(ec); 1436 kmem_free(enm, sizeof(*enm)); 1437 1438 /* 1439 * Return ENETRESET to inform the driver that the list has changed 1440 * and its reception filter should be adjusted accordingly. 1441 */ 1442 return ENETRESET; 1443 1444error: 1445 ETHER_UNLOCK(ec); 1446 return error; 1447} 1448 1449void 1450ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1451{ 1452 ec->ec_ifflags_cb = cb; 1453} 1454 1455void 1456ether_set_vlan_cb(struct ethercom *ec, ether_vlancb_t cb) 1457{ 1458 1459 ec->ec_vlan_cb = cb; 1460} 1461 1462static int 1463ether_ioctl_reinit(struct ethercom *ec) 1464{ 1465 struct ifnet *ifp = &ec->ec_if; 1466 int error; 1467 1468 KASSERTMSG(IFNET_LOCKED(ifp), "%s", ifp->if_xname); 1469 1470 switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { 1471 case IFF_RUNNING: 1472 /* 1473 * If interface is marked down and it is running, 1474 * then stop and disable it. 1475 */ 1476 if_stop(ifp, 1); 1477 break; 1478 case IFF_UP: 1479 /* 1480 * If interface is marked up and it is stopped, then 1481 * start it. 1482 */ 1483 return if_init(ifp); 1484 case IFF_UP | IFF_RUNNING: 1485 error = 0; 1486 if (ec->ec_ifflags_cb != NULL) { 1487 error = (*ec->ec_ifflags_cb)(ec); 1488 if (error == ENETRESET) { 1489 /* 1490 * Reset the interface to pick up 1491 * changes in any other flags that 1492 * affect the hardware state. 1493 */ 1494 return if_init(ifp); 1495 } 1496 } else 1497 error = if_init(ifp); 1498 return error; 1499 case 0: 1500 break; 1501 } 1502 1503 return 0; 1504} 1505 1506/* 1507 * Common ioctls for Ethernet interfaces. Note, we must be 1508 * called at splnet(). 1509 */ 1510int 1511ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1512{ 1513 struct ethercom *ec = (void *)ifp; 1514 struct eccapreq *eccr; 1515 struct ifreq *ifr = (struct ifreq *)data; 1516 struct if_laddrreq *iflr = data; 1517 const struct sockaddr_dl *sdl; 1518 static const uint8_t zero[ETHER_ADDR_LEN]; 1519 int error; 1520 1521 switch (cmd) { 1522 case SIOCINITIFADDR: 1523 { 1524 struct ifaddr *ifa = (struct ifaddr *)data; 1525 if (ifa->ifa_addr->sa_family != AF_LINK 1526 && (ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 1527 (IFF_UP | IFF_RUNNING)) { 1528 ifp->if_flags |= IFF_UP; 1529 if ((error = if_init(ifp)) != 0) 1530 return error; 1531 } 1532#ifdef INET 1533 if (ifa->ifa_addr->sa_family == AF_INET) 1534 arp_ifinit(ifp, ifa); 1535#endif 1536 return 0; 1537 } 1538 1539 case SIOCSIFMTU: 1540 { 1541 int maxmtu; 1542 1543 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1544 maxmtu = ETHERMTU_JUMBO; 1545 else 1546 maxmtu = ETHERMTU; 1547 1548 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1549 return EINVAL; 1550 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1551 return error; 1552 else if (ifp->if_flags & IFF_UP) { 1553 /* Make sure the device notices the MTU change. */ 1554 return if_init(ifp); 1555 } else 1556 return 0; 1557 } 1558 1559 case SIOCSIFFLAGS: 1560 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1561 return error; 1562 return ether_ioctl_reinit(ec); 1563 case SIOCGIFFLAGS: 1564 error = ifioctl_common(ifp, cmd, data); 1565 if (error == 0) { 1566 /* Set IFF_ALLMULTI for backcompat */ 1567 ifr->ifr_flags |= (ec->ec_flags & ETHER_F_ALLMULTI) ? 1568 IFF_ALLMULTI : 0; 1569 } 1570 return error; 1571 case SIOCGETHERCAP: 1572 eccr = (struct eccapreq *)data; 1573 eccr->eccr_capabilities = ec->ec_capabilities; 1574 eccr->eccr_capenable = ec->ec_capenable; 1575 return 0; 1576 case SIOCSETHERCAP: 1577 eccr = (struct eccapreq *)data; 1578 if ((eccr->eccr_capenable & ~ec->ec_capabilities) != 0) 1579 return EINVAL; 1580 if (eccr->eccr_capenable == ec->ec_capenable) 1581 return 0; 1582#if 0 /* notyet */ 1583 ec->ec_capenable = (ec->ec_capenable & ETHERCAP_CANTCHANGE) 1584 | (eccr->eccr_capenable & ~ETHERCAP_CANTCHANGE); 1585#else 1586 ec->ec_capenable = eccr->eccr_capenable; 1587#endif 1588 return ether_ioctl_reinit(ec); 1589 case SIOCADDMULTI: 1590 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1591 case SIOCDELMULTI: 1592 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1593 case SIOCSIFMEDIA: 1594 case SIOCGIFMEDIA: 1595 if (ec->ec_mii != NULL) 1596 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, 1597 cmd); 1598 else if (ec->ec_ifmedia != NULL) 1599 return ifmedia_ioctl(ifp, ifr, ec->ec_ifmedia, cmd); 1600 else 1601 return ENOTTY; 1602 break; 1603 case SIOCALIFADDR: 1604 sdl = satocsdl(sstocsa(&iflr->addr)); 1605 if (sdl->sdl_family != AF_LINK) 1606 ; 1607 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1608 return EINVAL; 1609 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1610 return EINVAL; 1611 /*FALLTHROUGH*/ 1612 default: 1613 return ifioctl_common(ifp, cmd, data); 1614 } 1615 return 0; 1616} 1617 1618/* 1619 * Enable/disable passing VLAN packets if the parent interface supports it. 1620 * Return: 1621 * 0: Ok 1622 * -1: Parent interface does not support vlans 1623 * >0: Error 1624 */ 1625int 1626ether_enable_vlan_mtu(struct ifnet *ifp) 1627{ 1628 int error; 1629 struct ethercom *ec = (void *)ifp; 1630 1631 /* Parent does not support VLAN's */ 1632 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) 1633 return -1; 1634 1635 /* 1636 * Parent supports the VLAN_MTU capability, 1637 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; 1638 * enable it. 1639 */ 1640 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1641 1642 /* Interface is down, defer for later */ 1643 if ((ifp->if_flags & IFF_UP) == 0) 1644 return 0; 1645 1646 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1647 return 0; 1648 1649 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1650 return error; 1651} 1652 1653int 1654ether_disable_vlan_mtu(struct ifnet *ifp) 1655{ 1656 int error; 1657 struct ethercom *ec = (void *)ifp; 1658 1659 /* We still have VLAN's, defer for later */ 1660 if (ec->ec_nvlans != 0) 1661 return 0; 1662 1663 /* Parent does not support VLAB's, nothing to do. */ 1664 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) 1665 return -1; 1666 1667 /* 1668 * Disable Tx/Rx of VLAN-sized frames. 1669 */ 1670 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1671 1672 /* Interface is down, defer for later */ 1673 if ((ifp->if_flags & IFF_UP) == 0) 1674 return 0; 1675 1676 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1677 return 0; 1678 1679 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1680 return error; 1681} 1682 1683/* 1684 * Add and delete VLAN TAG 1685 */ 1686int 1687ether_add_vlantag(struct ifnet *ifp, uint16_t vtag, bool *vlanmtu_status) 1688{ 1689 struct ethercom *ec = (void *)ifp; 1690 struct vlanid_list *vidp; 1691 bool vlanmtu_enabled; 1692 uint16_t vid = EVL_VLANOFTAG(vtag); 1693 int error; 1694 1695 vlanmtu_enabled = false; 1696 1697 /* Add a vid to the list */ 1698 vidp = kmem_alloc(sizeof(*vidp), KM_SLEEP); 1699 vidp->vid = vid; 1700 1701 ETHER_LOCK(ec); 1702 ec->ec_nvlans++; 1703 SIMPLEQ_INSERT_TAIL(&ec->ec_vids, vidp, vid_list); 1704 ETHER_UNLOCK(ec); 1705 1706 if (ec->ec_nvlans == 1) { 1707 IFNET_LOCK(ifp); 1708 error = ether_enable_vlan_mtu(ifp); 1709 IFNET_UNLOCK(ifp); 1710 1711 if (error == 0) { 1712 vlanmtu_enabled = true; 1713 } else if (error != -1) { 1714 goto fail; 1715 } 1716 } 1717 1718 if (ec->ec_vlan_cb != NULL) { 1719 error = (*ec->ec_vlan_cb)(ec, vid, true); 1720 if (error != 0) 1721 goto fail; 1722 } 1723 1724 if (vlanmtu_status != NULL) 1725 *vlanmtu_status = vlanmtu_enabled; 1726 1727 return 0; 1728fail: 1729 ETHER_LOCK(ec); 1730 ec->ec_nvlans--; 1731 SIMPLEQ_REMOVE(&ec->ec_vids, vidp, vlanid_list, vid_list); 1732 ETHER_UNLOCK(ec); 1733 1734 if (vlanmtu_enabled) { 1735 IFNET_LOCK(ifp); 1736 (void)ether_disable_vlan_mtu(ifp); 1737 IFNET_UNLOCK(ifp); 1738 } 1739 1740 kmem_free(vidp, sizeof(*vidp)); 1741 1742 return error; 1743} 1744 1745int 1746ether_del_vlantag(struct ifnet *ifp, uint16_t vtag) 1747{ 1748 struct ethercom *ec = (void *)ifp; 1749 struct vlanid_list *vidp; 1750 uint16_t vid = EVL_VLANOFTAG(vtag); 1751 1752 ETHER_LOCK(ec); 1753 SIMPLEQ_FOREACH(vidp, &ec->ec_vids, vid_list) { 1754 if (vidp->vid == vid) { 1755 SIMPLEQ_REMOVE(&ec->ec_vids, vidp, 1756 vlanid_list, vid_list); 1757 ec->ec_nvlans--; 1758 break; 1759 } 1760 } 1761 ETHER_UNLOCK(ec); 1762 1763 if (vidp == NULL) 1764 return ENOENT; 1765 1766 if (ec->ec_vlan_cb != NULL) { 1767 (void)(*ec->ec_vlan_cb)(ec, vidp->vid, false); 1768 } 1769 1770 if (ec->ec_nvlans == 0) { 1771 IFNET_LOCK(ifp); 1772 (void)ether_disable_vlan_mtu(ifp); 1773 IFNET_UNLOCK(ifp); 1774 } 1775 1776 kmem_free(vidp, sizeof(*vidp)); 1777 1778 return 0; 1779} 1780 1781int 1782ether_inject_vlantag(struct mbuf **mp, uint16_t etype, uint16_t tag) 1783{ 1784 static const size_t min_data_len = 1785 ETHER_MIN_LEN - ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1786 /* Used to pad ethernet frames with < ETHER_MIN_LEN bytes */ 1787 static const char vlan_zero_pad_buff[ETHER_MIN_LEN] = { 0 }; 1788 1789 struct ether_vlan_header *evl; 1790 struct mbuf *m = *mp; 1791 int error; 1792 1793 error = 0; 1794 1795 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT); 1796 if (m == NULL) { 1797 error = ENOBUFS; 1798 goto out; 1799 } 1800 1801 if (m->m_len < sizeof(*evl)) { 1802 m = m_pullup(m, sizeof(*evl)); 1803 if (m == NULL) { 1804 error = ENOBUFS; 1805 goto out; 1806 } 1807 } 1808 1809 /* 1810 * Transform the Ethernet header into an 1811 * Ethernet header with 802.1Q encapsulation. 1812 */ 1813 memmove(mtod(m, void *), 1814 mtod(m, char *) + ETHER_VLAN_ENCAP_LEN, 1815 sizeof(struct ether_header)); 1816 evl = mtod(m, struct ether_vlan_header *); 1817 evl->evl_proto = evl->evl_encap_proto; 1818 evl->evl_encap_proto = htons(etype); 1819 evl->evl_tag = htons(tag); 1820 1821 /* 1822 * To cater for VLAN-aware layer 2 ethernet 1823 * switches which may need to strip the tag 1824 * before forwarding the packet, make sure 1825 * the packet+tag is at least 68 bytes long. 1826 * This is necessary because our parent will 1827 * only pad to 64 bytes (ETHER_MIN_LEN) and 1828 * some switches will not pad by themselves 1829 * after deleting a tag. 1830 */ 1831 if (m->m_pkthdr.len < min_data_len) { 1832 m_copyback(m, m->m_pkthdr.len, 1833 min_data_len - m->m_pkthdr.len, 1834 vlan_zero_pad_buff); 1835 } 1836 1837 m->m_flags &= ~M_VLANTAG; 1838 1839out: 1840 *mp = m; 1841 return error; 1842} 1843 1844struct mbuf * 1845ether_strip_vlantag(struct mbuf *m) 1846{ 1847 struct ether_vlan_header *evl; 1848 1849 if (m->m_len < sizeof(*evl) && 1850 (m = m_pullup(m, sizeof(*evl))) == NULL) { 1851 return NULL; 1852 } 1853 1854 if (m_makewritable(&m, 0, sizeof(*evl), M_DONTWAIT)) { 1855 m_freem(m); 1856 return NULL; 1857 } 1858 1859 evl = mtod(m, struct ether_vlan_header *); 1860 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN); 1861 1862 vlan_set_tag(m, ntohs(evl->evl_tag)); 1863 1864 /* 1865 * Restore the original ethertype. We'll remove 1866 * the encapsulation after we've found the vlan 1867 * interface corresponding to the tag. 1868 */ 1869 evl->evl_encap_proto = evl->evl_proto; 1870 1871 /* 1872 * Remove the encapsulation header and append tag. 1873 * The original header has already been fixed up above. 1874 */ 1875 vlan_set_tag(m, ntohs(evl->evl_tag)); 1876 memmove((char *)evl + ETHER_VLAN_ENCAP_LEN, evl, 1877 offsetof(struct ether_vlan_header, evl_encap_proto)); 1878 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1879 1880 return m; 1881} 1882 1883static int 1884ether_multicast_sysctl(SYSCTLFN_ARGS) 1885{ 1886 struct ether_multi *enm; 1887 struct ifnet *ifp; 1888 struct ethercom *ec; 1889 int error = 0; 1890 size_t written; 1891 struct psref psref; 1892 int bound; 1893 unsigned int multicnt; 1894 struct ether_multi_sysctl *addrs; 1895 int i; 1896 1897 if (namelen != 1) 1898 return EINVAL; 1899 1900 bound = curlwp_bind(); 1901 ifp = if_get_byindex(name[0], &psref); 1902 if (ifp == NULL) { 1903 error = ENODEV; 1904 goto out; 1905 } 1906 if (ifp->if_type != IFT_ETHER) { 1907 if_put(ifp, &psref); 1908 *oldlenp = 0; 1909 goto out; 1910 } 1911 ec = (struct ethercom *)ifp; 1912 1913 if (oldp == NULL) { 1914 if_put(ifp, &psref); 1915 *oldlenp = ec->ec_multicnt * sizeof(*addrs); 1916 goto out; 1917 } 1918 1919 /* 1920 * ec->ec_lock is a spin mutex so we cannot call sysctl_copyout, which 1921 * is sleepable, while holding it. Copy data to a local buffer first 1922 * with the lock taken and then call sysctl_copyout without holding it. 1923 */ 1924retry: 1925 multicnt = ec->ec_multicnt; 1926 1927 if (multicnt == 0) { 1928 if_put(ifp, &psref); 1929 *oldlenp = 0; 1930 goto out; 1931 } 1932 1933 addrs = kmem_zalloc(sizeof(*addrs) * multicnt, KM_SLEEP); 1934 1935 ETHER_LOCK(ec); 1936 if (multicnt != ec->ec_multicnt) { 1937 /* The number of multicast addresses has changed */ 1938 ETHER_UNLOCK(ec); 1939 kmem_free(addrs, sizeof(*addrs) * multicnt); 1940 goto retry; 1941 } 1942 1943 i = 0; 1944 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1945 struct ether_multi_sysctl *addr = &addrs[i]; 1946 addr->enm_refcount = enm->enm_refcount; 1947 memcpy(addr->enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1948 memcpy(addr->enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1949 i++; 1950 } 1951 ETHER_UNLOCK(ec); 1952 1953 error = 0; 1954 written = 0; 1955 for (i = 0; i < multicnt; i++) { 1956 struct ether_multi_sysctl *addr = &addrs[i]; 1957 1958 if (written + sizeof(*addr) > *oldlenp) 1959 break; 1960 error = sysctl_copyout(l, addr, oldp, sizeof(*addr)); 1961 if (error) 1962 break; 1963 written += sizeof(*addr); 1964 oldp = (char *)oldp + sizeof(*addr); 1965 } 1966 kmem_free(addrs, sizeof(*addrs) * multicnt); 1967 1968 if_put(ifp, &psref); 1969 1970 *oldlenp = written; 1971out: 1972 curlwp_bindx(bound); 1973 return error; 1974} 1975 1976static void 1977ether_sysctl_setup(struct sysctllog **clog) 1978{ 1979 const struct sysctlnode *rnode = NULL; 1980 1981 sysctl_createv(clog, 0, NULL, &rnode, 1982 CTLFLAG_PERMANENT, 1983 CTLTYPE_NODE, "ether", 1984 SYSCTL_DESCR("Ethernet-specific information"), 1985 NULL, 0, NULL, 0, 1986 CTL_NET, CTL_CREATE, CTL_EOL); 1987 1988 sysctl_createv(clog, 0, &rnode, NULL, 1989 CTLFLAG_PERMANENT, 1990 CTLTYPE_NODE, "multicast", 1991 SYSCTL_DESCR("multicast addresses"), 1992 ether_multicast_sysctl, 0, NULL, 0, 1993 CTL_CREATE, CTL_EOL); 1994 1995 sysctl_createv(clog, 0, &rnode, NULL, 1996 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 1997 CTLTYPE_STRING, "rps_hash", 1998 SYSCTL_DESCR("Interface rps hash function control"), 1999 sysctl_pktq_rps_hash_handler, 0, (void *)ðer_pktq_rps_hash_p, 2000 PKTQ_RPS_HASH_NAME_LEN, 2001 CTL_CREATE, CTL_EOL); 2002} 2003 2004void 2005etherinit(void) 2006{ 2007 2008#ifdef DIAGNOSTIC 2009 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); 2010#endif 2011 ether_pktq_rps_hash_p = pktq_rps_hash_default; 2012 ether_sysctl_setup(NULL); 2013} 2014