if_ethersubr.c revision 1.317
1 /* $NetBSD: if_ethersubr.c,v 1.317 2022/09/03 01:35:03 thorpej 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 1.317 2022/09/03 01:35:03 thorpej 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 158 159 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 CTASSERT(sizeof(struct ether_addr) == 6); 169 CTASSERT(sizeof(struct ether_header) == 14); 170 171 #ifdef DIAGNOSTIC 172 static struct timeval bigpktppslim_last; 173 static int bigpktppslim = 2; /* XXX */ 174 static int bigpktpps_count; 175 static kmutex_t bigpktpps_lock __cacheline_aligned; 176 #endif 177 178 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 179 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 180 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 181 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 182 #define senderr(e) { error = (e); goto bad;} 183 184 static pktq_rps_hash_func_t ether_pktq_rps_hash_p; 185 186 static 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 */ 194 static int 195 ether_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); 463 464 bad: 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 */ 480 void 481 altq_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; 565 566 bad: 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) 574 static void 575 ether_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; 627 628 noproto: 629 m_freem(m); 630 if_statinc(ifp, if_noproto); 631 return; 632 error: 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 */ 644 void 645 ether_input(struct ifnet *ifp, struct mbuf *m) 646 { 647 #if NVLAN > 0 || defined(MBUFTRACE) 648 struct ethercom *ec = (struct ethercom *) ifp; 649 #endif 650 pktqueue_t *pktq = NULL; 651 struct ifqueue *inq = NULL; 652 uint16_t etype; 653 struct ether_header *eh; 654 size_t ehlen; 655 static int earlypkts; 656 int isr = 0; 657 658 /* No RPS for not-IP. */ 659 pktq_rps_hash_func_t rps_hash = NULL; 660 661 KASSERT(!cpu_intr_p()); 662 KASSERT((m->m_flags & M_PKTHDR) != 0); 663 664 if ((ifp->if_flags & IFF_UP) == 0) 665 goto drop; 666 667 #ifdef MBUFTRACE 668 m_claimm(m, &ec->ec_rx_mowner); 669 #endif 670 671 if (__predict_false(m->m_len < sizeof(*eh))) { 672 if ((m = m_pullup(m, sizeof(*eh))) == NULL) { 673 if_statinc(ifp, if_ierrors); 674 return; 675 } 676 } 677 678 eh = mtod(m, struct ether_header *); 679 etype = ntohs(eh->ether_type); 680 ehlen = sizeof(*eh); 681 682 if (__predict_false(earlypkts < 100 || 683 entropy_epoch() == (unsigned)-1)) { 684 rnd_add_data(NULL, eh, ehlen, 0); 685 earlypkts++; 686 } 687 688 /* 689 * Determine if the packet is within its size limits. For MPLS the 690 * header length is variable, so we skip the check. 691 */ 692 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 693 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 694 #ifdef DIAGNOSTIC 695 mutex_enter(&bigpktpps_lock); 696 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 697 bigpktppslim)) { 698 printf("%s: discarding oversize frame (len=%d)\n", 699 ifp->if_xname, m->m_pkthdr.len); 700 } 701 mutex_exit(&bigpktpps_lock); 702 #endif 703 goto error; 704 } 705 706 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 707 /* 708 * If this is not a simplex interface, drop the packet 709 * if it came from us. 710 */ 711 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 712 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 713 ETHER_ADDR_LEN) == 0) { 714 goto drop; 715 } 716 717 if (memcmp(etherbroadcastaddr, 718 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 719 m->m_flags |= M_BCAST; 720 else 721 m->m_flags |= M_MCAST; 722 if_statinc(ifp, if_imcasts); 723 } 724 725 /* If the CRC is still on the packet, trim it off. */ 726 if (m->m_flags & M_HASFCS) { 727 m_adj(m, -ETHER_CRC_LEN); 728 m->m_flags &= ~M_HASFCS; 729 } 730 731 if_statadd(ifp, if_ibytes, m->m_pkthdr.len); 732 733 if (!vlan_has_tag(m) && etype == ETHERTYPE_VLAN) { 734 m = ether_strip_vlantag(m); 735 if (m == NULL) { 736 if_statinc(ifp, if_ierrors); 737 return; 738 } 739 740 eh = mtod(m, struct ether_header *); 741 etype = ntohs(eh->ether_type); 742 ehlen = sizeof(*eh); 743 } 744 745 if ((m->m_flags & (M_BCAST | M_MCAST | M_PROMISC)) == 0 && 746 (ifp->if_flags & IFF_PROMISC) != 0 && 747 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 748 ETHER_ADDR_LEN) != 0) { 749 m->m_flags |= M_PROMISC; 750 } 751 752 if ((m->m_flags & M_PROMISC) == 0) { 753 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 754 return; 755 if (m == NULL) 756 return; 757 758 eh = mtod(m, struct ether_header *); 759 etype = ntohs(eh->ether_type); 760 } 761 762 /* 763 * Processing a logical interfaces that are able 764 * to configure vlan(4). 765 */ 766 #if NAGR > 0 767 if (ifp->if_lagg != NULL && 768 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 769 m->m_flags &= ~M_PROMISC; 770 agr_input(ifp, m); 771 return; 772 } 773 #endif 774 775 /* 776 * VLAN processing. 777 * 778 * VLAN provides service delimiting so the frames are 779 * processed before other handlings. If a VLAN interface 780 * does not exist to take those frames, they're returned 781 * to ether_input(). 782 */ 783 784 if (vlan_has_tag(m)) { 785 if (EVL_VLANOFTAG(vlan_get_tag(m)) == 0) { 786 if (etype == ETHERTYPE_VLAN || 787 etype == ETHERTYPE_QINQ) 788 goto drop; 789 790 /* XXX we should actually use the prio value? */ 791 m->m_flags &= ~M_VLANTAG; 792 } else { 793 #if NVLAN > 0 794 if (ec->ec_nvlans > 0) { 795 m = vlan_input(ifp, m); 796 797 /* vlan_input() called ether_input() recursively */ 798 if (m == NULL) 799 return; 800 } 801 #endif 802 /* drop VLAN frames not for this port. */ 803 goto noproto; 804 } 805 } 806 807 #if NCARP > 0 808 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 809 /* 810 * Clear M_PROMISC, in case the packet comes from a 811 * vlan. 812 */ 813 m->m_flags &= ~M_PROMISC; 814 if (carp_input(m, (uint8_t *)&eh->ether_shost, 815 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 816 return; 817 } 818 #endif 819 820 /* 821 * Handle protocols that expect to have the Ethernet header 822 * (and possibly FCS) intact. 823 */ 824 switch (etype) { 825 #if NPPPOE > 0 826 case ETHERTYPE_PPPOEDISC: 827 pppoedisc_input(ifp, m); 828 return; 829 830 case ETHERTYPE_PPPOE: 831 pppoe_input(ifp, m); 832 return; 833 #endif 834 835 case ETHERTYPE_SLOWPROTOCOLS: { 836 uint8_t subtype; 837 838 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) 839 goto error; 840 841 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 842 switch (subtype) { 843 #if NAGR > 0 844 case SLOWPROTOCOLS_SUBTYPE_LACP: 845 if (ifp->if_lagg != NULL) { 846 ieee8023ad_lacp_input(ifp, m); 847 return; 848 } 849 break; 850 851 case SLOWPROTOCOLS_SUBTYPE_MARKER: 852 if (ifp->if_lagg != NULL) { 853 ieee8023ad_marker_input(ifp, m); 854 return; 855 } 856 break; 857 #endif 858 859 default: 860 if (subtype == 0 || subtype > 10) { 861 /* illegal value */ 862 goto error; 863 } 864 /* unknown subtype */ 865 break; 866 } 867 } 868 /* FALLTHROUGH */ 869 default: 870 if (m->m_flags & M_PROMISC) 871 goto drop; 872 } 873 874 /* If the CRC is still on the packet, trim it off. */ 875 if (m->m_flags & M_HASFCS) { 876 m_adj(m, -ETHER_CRC_LEN); 877 m->m_flags &= ~M_HASFCS; 878 } 879 880 /* etype represents the size of the payload in this case */ 881 if (etype <= ETHERMTU + sizeof(struct ether_header)) { 882 KASSERT(ehlen == sizeof(*eh)); 883 #if defined (LLC) || defined (NETATALK) 884 ether_input_llc(ifp, m, eh); 885 return; 886 #else 887 /* ethertype of 0-1500 is regarded as noproto */ 888 goto noproto; 889 #endif 890 } 891 892 /* Strip off the Ethernet header. */ 893 m_adj(m, ehlen); 894 895 switch (etype) { 896 #ifdef INET 897 case ETHERTYPE_IP: 898 #ifdef GATEWAY 899 if (ipflow_fastforward(m)) 900 return; 901 #endif 902 pktq = ip_pktq; 903 rps_hash = atomic_load_relaxed(ðer_pktq_rps_hash_p); 904 break; 905 906 case ETHERTYPE_ARP: 907 pktq = arp_pktq; 908 break; 909 910 case ETHERTYPE_REVARP: 911 revarpinput(m); /* XXX queue? */ 912 return; 913 #endif 914 915 #ifdef INET6 916 case ETHERTYPE_IPV6: 917 if (__predict_false(!in6_present)) 918 goto noproto; 919 #ifdef GATEWAY 920 if (ip6flow_fastforward(&m)) 921 return; 922 #endif 923 pktq = ip6_pktq; 924 rps_hash = atomic_load_relaxed(ðer_pktq_rps_hash_p); 925 break; 926 #endif 927 928 #ifdef NETATALK 929 case ETHERTYPE_ATALK: 930 isr = NETISR_ATALK; 931 inq = &atintrq1; 932 break; 933 934 case ETHERTYPE_AARP: 935 aarpinput(ifp, m); /* XXX queue? */ 936 return; 937 #endif 938 939 #ifdef MPLS 940 case ETHERTYPE_MPLS: 941 isr = NETISR_MPLS; 942 inq = &mplsintrq; 943 break; 944 #endif 945 946 default: 947 goto noproto; 948 } 949 950 if (__predict_true(pktq)) { 951 const uint32_t h = rps_hash ? pktq_rps_hash(&rps_hash, m) : 0; 952 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 953 m_freem(m); 954 } 955 return; 956 } 957 958 if (__predict_false(!inq)) { 959 /* Should not happen. */ 960 goto error; 961 } 962 963 IFQ_ENQUEUE_ISR(inq, m, isr); 964 return; 965 966 drop: 967 m_freem(m); 968 if_statinc(ifp, if_iqdrops); 969 return; 970 noproto: 971 m_freem(m); 972 if_statinc(ifp, if_noproto); 973 return; 974 error: 975 m_freem(m); 976 if_statinc(ifp, if_ierrors); 977 return; 978 } 979 980 static void 981 ether_bpf_mtap(struct bpf_if *bp, struct mbuf *m, u_int direction) 982 { 983 struct ether_vlan_header evl; 984 struct m_hdr mh, md; 985 986 KASSERT(bp != NULL); 987 988 if (!vlan_has_tag(m)) { 989 bpf_mtap3(bp, m, direction); 990 return; 991 } 992 993 memcpy(&evl, mtod(m, char *), ETHER_HDR_LEN); 994 evl.evl_proto = evl.evl_encap_proto; 995 evl.evl_encap_proto = htons(ETHERTYPE_VLAN); 996 evl.evl_tag = htons(vlan_get_tag(m)); 997 998 md.mh_flags = 0; 999 md.mh_data = m->m_data + ETHER_HDR_LEN; 1000 md.mh_len = m->m_len - ETHER_HDR_LEN; 1001 md.mh_next = m->m_next; 1002 1003 mh.mh_flags = 0; 1004 mh.mh_data = (char *)&evl; 1005 mh.mh_len = sizeof(evl); 1006 mh.mh_next = (struct mbuf *)&md; 1007 1008 bpf_mtap3(bp, (struct mbuf *)&mh, direction); 1009 } 1010 1011 /* 1012 * Convert Ethernet address to printable (loggable) representation. 1013 */ 1014 char * 1015 ether_sprintf(const u_char *ap) 1016 { 1017 static char etherbuf[3 * ETHER_ADDR_LEN]; 1018 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1019 } 1020 1021 char * 1022 ether_snprintf(char *buf, size_t len, const u_char *ap) 1023 { 1024 char *cp = buf; 1025 size_t i; 1026 1027 for (i = 0; i < len / 3; i++) { 1028 *cp++ = hexdigits[*ap >> 4]; 1029 *cp++ = hexdigits[*ap++ & 0xf]; 1030 *cp++ = ':'; 1031 } 1032 *--cp = '\0'; 1033 return buf; 1034 } 1035 1036 /* 1037 * Perform common duties while attaching to interface list 1038 */ 1039 void 1040 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 1041 { 1042 struct ethercom *ec = (struct ethercom *)ifp; 1043 char xnamebuf[HOOKNAMSIZ]; 1044 1045 ifp->if_type = IFT_ETHER; 1046 ifp->if_hdrlen = ETHER_HDR_LEN; 1047 ifp->if_dlt = DLT_EN10MB; 1048 ifp->if_mtu = ETHERMTU; 1049 ifp->if_output = ether_output; 1050 ifp->_if_input = ether_input; 1051 ifp->if_bpf_mtap = ether_bpf_mtap; 1052 if (ifp->if_baudrate == 0) 1053 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1054 1055 if (lla != NULL) 1056 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1057 1058 LIST_INIT(&ec->ec_multiaddrs); 1059 SIMPLEQ_INIT(&ec->ec_vids); 1060 ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 1061 ec->ec_flags = 0; 1062 ifp->if_broadcastaddr = etherbroadcastaddr; 1063 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1064 snprintf(xnamebuf, sizeof(xnamebuf), 1065 "%s-ether_ifdetachhooks", ifp->if_xname); 1066 ec->ec_ifdetach_hooks = simplehook_create(IPL_NET, xnamebuf); 1067 #ifdef MBUFTRACE 1068 mowner_init_owner(&ec->ec_tx_mowner, ifp->if_xname, "tx"); 1069 mowner_init_owner(&ec->ec_rx_mowner, ifp->if_xname, "rx"); 1070 MOWNER_ATTACH(&ec->ec_tx_mowner); 1071 MOWNER_ATTACH(&ec->ec_rx_mowner); 1072 ifp->if_mowner = &ec->ec_tx_mowner; 1073 #endif 1074 } 1075 1076 void 1077 ether_ifdetach(struct ifnet *ifp) 1078 { 1079 struct ethercom *ec = (void *) ifp; 1080 struct ether_multi *enm; 1081 1082 IFNET_ASSERT_UNLOCKED(ifp); 1083 /* 1084 * Prevent further calls to ioctl (for example turning off 1085 * promiscuous mode from the bridge code), which eventually can 1086 * call if_init() which can cause panics because the interface 1087 * is in the process of being detached. Return device not configured 1088 * instead. 1089 */ 1090 ifp->if_ioctl = __FPTRCAST(int (*)(struct ifnet *, u_long, void *), 1091 enxio); 1092 1093 simplehook_dohooks(ec->ec_ifdetach_hooks); 1094 KASSERT(!simplehook_has_hooks(ec->ec_ifdetach_hooks)); 1095 simplehook_destroy(ec->ec_ifdetach_hooks); 1096 1097 bpf_detach(ifp); 1098 1099 ETHER_LOCK(ec); 1100 KASSERT(ec->ec_nvlans == 0); 1101 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1102 LIST_REMOVE(enm, enm_list); 1103 kmem_free(enm, sizeof(*enm)); 1104 ec->ec_multicnt--; 1105 } 1106 ETHER_UNLOCK(ec); 1107 1108 mutex_obj_free(ec->ec_lock); 1109 ec->ec_lock = NULL; 1110 1111 ifp->if_mowner = NULL; 1112 MOWNER_DETACH(&ec->ec_rx_mowner); 1113 MOWNER_DETACH(&ec->ec_tx_mowner); 1114 } 1115 1116 void * 1117 ether_ifdetachhook_establish(struct ifnet *ifp, 1118 void (*fn)(void *), void *arg) 1119 { 1120 struct ethercom *ec; 1121 khook_t *hk; 1122 1123 if (ifp->if_type != IFT_ETHER) 1124 return NULL; 1125 1126 ec = (struct ethercom *)ifp; 1127 hk = simplehook_establish(ec->ec_ifdetach_hooks, 1128 fn, arg); 1129 1130 return (void *)hk; 1131 } 1132 1133 void 1134 ether_ifdetachhook_disestablish(struct ifnet *ifp, 1135 void *vhook, kmutex_t *lock) 1136 { 1137 struct ethercom *ec; 1138 1139 if (vhook == NULL) 1140 return; 1141 1142 ec = (struct ethercom *)ifp; 1143 simplehook_disestablish(ec->ec_ifdetach_hooks, vhook, lock); 1144 } 1145 1146 #if 0 1147 /* 1148 * This is for reference. We have a table-driven version 1149 * of the little-endian crc32 generator, which is faster 1150 * than the double-loop. 1151 */ 1152 uint32_t 1153 ether_crc32_le(const uint8_t *buf, size_t len) 1154 { 1155 uint32_t c, crc, carry; 1156 size_t i, j; 1157 1158 crc = 0xffffffffU; /* initial value */ 1159 1160 for (i = 0; i < len; i++) { 1161 c = buf[i]; 1162 for (j = 0; j < 8; j++) { 1163 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1164 crc >>= 1; 1165 c >>= 1; 1166 if (carry) 1167 crc = (crc ^ ETHER_CRC_POLY_LE); 1168 } 1169 } 1170 1171 return (crc); 1172 } 1173 #else 1174 uint32_t 1175 ether_crc32_le(const uint8_t *buf, size_t len) 1176 { 1177 static const uint32_t crctab[] = { 1178 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1179 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1180 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1181 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1182 }; 1183 uint32_t crc; 1184 size_t i; 1185 1186 crc = 0xffffffffU; /* initial value */ 1187 1188 for (i = 0; i < len; i++) { 1189 crc ^= buf[i]; 1190 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1191 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1192 } 1193 1194 return (crc); 1195 } 1196 #endif 1197 1198 uint32_t 1199 ether_crc32_be(const uint8_t *buf, size_t len) 1200 { 1201 uint32_t c, crc, carry; 1202 size_t i, j; 1203 1204 crc = 0xffffffffU; /* initial value */ 1205 1206 for (i = 0; i < len; i++) { 1207 c = buf[i]; 1208 for (j = 0; j < 8; j++) { 1209 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1210 crc <<= 1; 1211 c >>= 1; 1212 if (carry) 1213 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1214 } 1215 } 1216 1217 return (crc); 1218 } 1219 1220 #ifdef INET 1221 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1222 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1223 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1224 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1225 #endif 1226 #ifdef INET6 1227 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1228 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1229 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1230 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1231 #endif 1232 1233 /* 1234 * ether_aton implementation, not using a static buffer. 1235 */ 1236 int 1237 ether_aton_r(u_char *dest, size_t len, const char *str) 1238 { 1239 const u_char *cp = (const void *)str; 1240 u_char *ep; 1241 1242 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1243 1244 if (len < ETHER_ADDR_LEN) 1245 return ENOSPC; 1246 1247 ep = dest + ETHER_ADDR_LEN; 1248 1249 while (*cp) { 1250 if (!isxdigit(*cp)) 1251 return EINVAL; 1252 1253 *dest = atox(*cp); 1254 cp++; 1255 if (isxdigit(*cp)) { 1256 *dest = (*dest << 4) | atox(*cp); 1257 cp++; 1258 } 1259 dest++; 1260 1261 if (dest == ep) 1262 return (*cp == '\0') ? 0 : ENAMETOOLONG; 1263 1264 switch (*cp) { 1265 case ':': 1266 case '-': 1267 case '.': 1268 cp++; 1269 break; 1270 } 1271 } 1272 return ENOBUFS; 1273 } 1274 1275 /* 1276 * Convert a sockaddr into an Ethernet address or range of Ethernet 1277 * addresses. 1278 */ 1279 int 1280 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1281 uint8_t addrhi[ETHER_ADDR_LEN]) 1282 { 1283 #ifdef INET 1284 const struct sockaddr_in *sin; 1285 #endif 1286 #ifdef INET6 1287 const struct sockaddr_in6 *sin6; 1288 #endif 1289 1290 switch (sa->sa_family) { 1291 1292 case AF_UNSPEC: 1293 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1294 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1295 break; 1296 1297 #ifdef INET 1298 case AF_INET: 1299 sin = satocsin(sa); 1300 if (sin->sin_addr.s_addr == INADDR_ANY) { 1301 /* 1302 * An IP address of INADDR_ANY means listen to 1303 * or stop listening to all of the Ethernet 1304 * multicast addresses used for IP. 1305 * (This is for the sake of IP multicast routers.) 1306 */ 1307 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1308 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1309 } else { 1310 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1311 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1312 } 1313 break; 1314 #endif 1315 #ifdef INET6 1316 case AF_INET6: 1317 sin6 = satocsin6(sa); 1318 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1319 /* 1320 * An IP6 address of 0 means listen to or stop 1321 * listening to all of the Ethernet multicast 1322 * address used for IP6. 1323 * (This is used for multicast routers.) 1324 */ 1325 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1326 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1327 } else { 1328 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1329 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1330 } 1331 break; 1332 #endif 1333 1334 default: 1335 return EAFNOSUPPORT; 1336 } 1337 return 0; 1338 } 1339 1340 /* 1341 * Add an Ethernet multicast address or range of addresses to the list for a 1342 * given interface. 1343 */ 1344 int 1345 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1346 { 1347 struct ether_multi *enm, *_enm; 1348 u_char addrlo[ETHER_ADDR_LEN]; 1349 u_char addrhi[ETHER_ADDR_LEN]; 1350 int error = 0; 1351 1352 /* Allocate out of lock */ 1353 enm = kmem_alloc(sizeof(*enm), KM_SLEEP); 1354 1355 ETHER_LOCK(ec); 1356 error = ether_multiaddr(sa, addrlo, addrhi); 1357 if (error != 0) 1358 goto out; 1359 1360 /* 1361 * Verify that we have valid Ethernet multicast addresses. 1362 */ 1363 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1364 error = EINVAL; 1365 goto out; 1366 } 1367 1368 /* 1369 * See if the address range is already in the list. 1370 */ 1371 _enm = ether_lookup_multi(addrlo, addrhi, ec); 1372 if (_enm != NULL) { 1373 /* 1374 * Found it; just increment the reference count. 1375 */ 1376 ++_enm->enm_refcount; 1377 error = 0; 1378 goto out; 1379 } 1380 1381 /* 1382 * Link a new multicast record into the interface's multicast list. 1383 */ 1384 memcpy(enm->enm_addrlo, addrlo, ETHER_ADDR_LEN); 1385 memcpy(enm->enm_addrhi, addrhi, ETHER_ADDR_LEN); 1386 enm->enm_refcount = 1; 1387 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1388 ec->ec_multicnt++; 1389 1390 /* 1391 * Return ENETRESET to inform the driver that the list has changed 1392 * and its reception filter should be adjusted accordingly. 1393 */ 1394 error = ENETRESET; 1395 enm = NULL; 1396 1397 out: 1398 ETHER_UNLOCK(ec); 1399 if (enm != NULL) 1400 kmem_free(enm, sizeof(*enm)); 1401 return error; 1402 } 1403 1404 /* 1405 * Delete a multicast address record. 1406 */ 1407 int 1408 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1409 { 1410 struct ether_multi *enm; 1411 u_char addrlo[ETHER_ADDR_LEN]; 1412 u_char addrhi[ETHER_ADDR_LEN]; 1413 int error; 1414 1415 ETHER_LOCK(ec); 1416 error = ether_multiaddr(sa, addrlo, addrhi); 1417 if (error != 0) 1418 goto error; 1419 1420 /* 1421 * Look up the address in our list. 1422 */ 1423 enm = ether_lookup_multi(addrlo, addrhi, ec); 1424 if (enm == NULL) { 1425 error = ENXIO; 1426 goto error; 1427 } 1428 if (--enm->enm_refcount != 0) { 1429 /* 1430 * Still some claims to this record. 1431 */ 1432 error = 0; 1433 goto error; 1434 } 1435 1436 /* 1437 * No remaining claims to this record; unlink and free it. 1438 */ 1439 LIST_REMOVE(enm, enm_list); 1440 ec->ec_multicnt--; 1441 ETHER_UNLOCK(ec); 1442 kmem_free(enm, sizeof(*enm)); 1443 1444 /* 1445 * Return ENETRESET to inform the driver that the list has changed 1446 * and its reception filter should be adjusted accordingly. 1447 */ 1448 return ENETRESET; 1449 1450 error: 1451 ETHER_UNLOCK(ec); 1452 return error; 1453 } 1454 1455 void 1456 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1457 { 1458 ec->ec_ifflags_cb = cb; 1459 } 1460 1461 void 1462 ether_set_vlan_cb(struct ethercom *ec, ether_vlancb_t cb) 1463 { 1464 1465 ec->ec_vlan_cb = cb; 1466 } 1467 1468 static int 1469 ether_ioctl_reinit(struct ethercom *ec) 1470 { 1471 struct ifnet *ifp = &ec->ec_if; 1472 int error; 1473 1474 KASSERTMSG(IFNET_LOCKED(ifp), "%s", ifp->if_xname); 1475 1476 switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { 1477 case IFF_RUNNING: 1478 /* 1479 * If interface is marked down and it is running, 1480 * then stop and disable it. 1481 */ 1482 if_stop(ifp, 1); 1483 break; 1484 case IFF_UP: 1485 /* 1486 * If interface is marked up and it is stopped, then 1487 * start it. 1488 */ 1489 return if_init(ifp); 1490 case IFF_UP | IFF_RUNNING: 1491 error = 0; 1492 if (ec->ec_ifflags_cb != NULL) { 1493 error = (*ec->ec_ifflags_cb)(ec); 1494 if (error == ENETRESET) { 1495 /* 1496 * Reset the interface to pick up 1497 * changes in any other flags that 1498 * affect the hardware state. 1499 */ 1500 return if_init(ifp); 1501 } 1502 } else 1503 error = if_init(ifp); 1504 return error; 1505 case 0: 1506 break; 1507 } 1508 1509 return 0; 1510 } 1511 1512 /* 1513 * Common ioctls for Ethernet interfaces. Note, we must be 1514 * called at splnet(). 1515 */ 1516 int 1517 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1518 { 1519 struct ethercom *ec = (void *)ifp; 1520 struct eccapreq *eccr; 1521 struct ifreq *ifr = (struct ifreq *)data; 1522 struct if_laddrreq *iflr = data; 1523 const struct sockaddr_dl *sdl; 1524 static const uint8_t zero[ETHER_ADDR_LEN]; 1525 int error; 1526 1527 switch (cmd) { 1528 case SIOCINITIFADDR: 1529 { 1530 struct ifaddr *ifa = (struct ifaddr *)data; 1531 if (ifa->ifa_addr->sa_family != AF_LINK 1532 && (ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 1533 (IFF_UP | IFF_RUNNING)) { 1534 ifp->if_flags |= IFF_UP; 1535 if ((error = if_init(ifp)) != 0) 1536 return error; 1537 } 1538 #ifdef INET 1539 if (ifa->ifa_addr->sa_family == AF_INET) 1540 arp_ifinit(ifp, ifa); 1541 #endif 1542 return 0; 1543 } 1544 1545 case SIOCSIFMTU: 1546 { 1547 int maxmtu; 1548 1549 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1550 maxmtu = ETHERMTU_JUMBO; 1551 else 1552 maxmtu = ETHERMTU; 1553 1554 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1555 return EINVAL; 1556 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1557 return error; 1558 else if (ifp->if_flags & IFF_UP) { 1559 /* Make sure the device notices the MTU change. */ 1560 return if_init(ifp); 1561 } else 1562 return 0; 1563 } 1564 1565 case SIOCSIFFLAGS: 1566 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1567 return error; 1568 return ether_ioctl_reinit(ec); 1569 case SIOCGIFFLAGS: 1570 error = ifioctl_common(ifp, cmd, data); 1571 if (error == 0) { 1572 /* Set IFF_ALLMULTI for backcompat */ 1573 ifr->ifr_flags |= (ec->ec_flags & ETHER_F_ALLMULTI) ? 1574 IFF_ALLMULTI : 0; 1575 } 1576 return error; 1577 case SIOCGETHERCAP: 1578 eccr = (struct eccapreq *)data; 1579 eccr->eccr_capabilities = ec->ec_capabilities; 1580 eccr->eccr_capenable = ec->ec_capenable; 1581 return 0; 1582 case SIOCSETHERCAP: 1583 eccr = (struct eccapreq *)data; 1584 if ((eccr->eccr_capenable & ~ec->ec_capabilities) != 0) 1585 return EINVAL; 1586 if (eccr->eccr_capenable == ec->ec_capenable) 1587 return 0; 1588 #if 0 /* notyet */ 1589 ec->ec_capenable = (ec->ec_capenable & ETHERCAP_CANTCHANGE) 1590 | (eccr->eccr_capenable & ~ETHERCAP_CANTCHANGE); 1591 #else 1592 ec->ec_capenable = eccr->eccr_capenable; 1593 #endif 1594 return ether_ioctl_reinit(ec); 1595 case SIOCADDMULTI: 1596 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1597 case SIOCDELMULTI: 1598 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1599 case SIOCSIFMEDIA: 1600 case SIOCGIFMEDIA: 1601 if (ec->ec_mii != NULL) 1602 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, 1603 cmd); 1604 else if (ec->ec_ifmedia != NULL) 1605 return ifmedia_ioctl(ifp, ifr, ec->ec_ifmedia, cmd); 1606 else 1607 return ENOTTY; 1608 break; 1609 case SIOCALIFADDR: 1610 sdl = satocsdl(sstocsa(&iflr->addr)); 1611 if (sdl->sdl_family != AF_LINK) 1612 ; 1613 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1614 return EINVAL; 1615 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1616 return EINVAL; 1617 /*FALLTHROUGH*/ 1618 default: 1619 return ifioctl_common(ifp, cmd, data); 1620 } 1621 return 0; 1622 } 1623 1624 /* 1625 * Enable/disable passing VLAN packets if the parent interface supports it. 1626 * Return: 1627 * 0: Ok 1628 * -1: Parent interface does not support vlans 1629 * >0: Error 1630 */ 1631 int 1632 ether_enable_vlan_mtu(struct ifnet *ifp) 1633 { 1634 int error; 1635 struct ethercom *ec = (void *)ifp; 1636 1637 /* Parent does not support VLAN's */ 1638 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) 1639 return -1; 1640 1641 /* 1642 * Parent supports the VLAN_MTU capability, 1643 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; 1644 * enable it. 1645 */ 1646 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1647 1648 /* Interface is down, defer for later */ 1649 if ((ifp->if_flags & IFF_UP) == 0) 1650 return 0; 1651 1652 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1653 return 0; 1654 1655 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1656 return error; 1657 } 1658 1659 int 1660 ether_disable_vlan_mtu(struct ifnet *ifp) 1661 { 1662 int error; 1663 struct ethercom *ec = (void *)ifp; 1664 1665 /* We still have VLAN's, defer for later */ 1666 if (ec->ec_nvlans != 0) 1667 return 0; 1668 1669 /* Parent does not support VLAB's, nothing to do. */ 1670 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) 1671 return -1; 1672 1673 /* 1674 * Disable Tx/Rx of VLAN-sized frames. 1675 */ 1676 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1677 1678 /* Interface is down, defer for later */ 1679 if ((ifp->if_flags & IFF_UP) == 0) 1680 return 0; 1681 1682 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1683 return 0; 1684 1685 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1686 return error; 1687 } 1688 1689 /* 1690 * Add and delete VLAN TAG 1691 */ 1692 int 1693 ether_add_vlantag(struct ifnet *ifp, uint16_t vtag, bool *vlanmtu_status) 1694 { 1695 struct ethercom *ec = (void *)ifp; 1696 struct vlanid_list *vidp; 1697 bool vlanmtu_enabled; 1698 uint16_t vid = EVL_VLANOFTAG(vtag); 1699 int error; 1700 1701 vlanmtu_enabled = false; 1702 1703 /* Add a vid to the list */ 1704 vidp = kmem_alloc(sizeof(*vidp), KM_SLEEP); 1705 vidp->vid = vid; 1706 1707 ETHER_LOCK(ec); 1708 ec->ec_nvlans++; 1709 SIMPLEQ_INSERT_TAIL(&ec->ec_vids, vidp, vid_list); 1710 ETHER_UNLOCK(ec); 1711 1712 if (ec->ec_nvlans == 1) { 1713 IFNET_LOCK(ifp); 1714 error = ether_enable_vlan_mtu(ifp); 1715 IFNET_UNLOCK(ifp); 1716 1717 if (error == 0) { 1718 vlanmtu_enabled = true; 1719 } else if (error != -1) { 1720 goto fail; 1721 } 1722 } 1723 1724 if (ec->ec_vlan_cb != NULL) { 1725 error = (*ec->ec_vlan_cb)(ec, vid, true); 1726 if (error != 0) 1727 goto fail; 1728 } 1729 1730 if (vlanmtu_status != NULL) 1731 *vlanmtu_status = vlanmtu_enabled; 1732 1733 return 0; 1734 fail: 1735 ETHER_LOCK(ec); 1736 ec->ec_nvlans--; 1737 SIMPLEQ_REMOVE(&ec->ec_vids, vidp, vlanid_list, vid_list); 1738 ETHER_UNLOCK(ec); 1739 1740 if (vlanmtu_enabled) { 1741 IFNET_LOCK(ifp); 1742 (void)ether_disable_vlan_mtu(ifp); 1743 IFNET_UNLOCK(ifp); 1744 } 1745 1746 kmem_free(vidp, sizeof(*vidp)); 1747 1748 return error; 1749 } 1750 1751 int 1752 ether_del_vlantag(struct ifnet *ifp, uint16_t vtag) 1753 { 1754 struct ethercom *ec = (void *)ifp; 1755 struct vlanid_list *vidp; 1756 uint16_t vid = EVL_VLANOFTAG(vtag); 1757 1758 ETHER_LOCK(ec); 1759 SIMPLEQ_FOREACH(vidp, &ec->ec_vids, vid_list) { 1760 if (vidp->vid == vid) { 1761 SIMPLEQ_REMOVE(&ec->ec_vids, vidp, 1762 vlanid_list, vid_list); 1763 ec->ec_nvlans--; 1764 break; 1765 } 1766 } 1767 ETHER_UNLOCK(ec); 1768 1769 if (vidp == NULL) 1770 return ENOENT; 1771 1772 if (ec->ec_vlan_cb != NULL) { 1773 (void)(*ec->ec_vlan_cb)(ec, vidp->vid, false); 1774 } 1775 1776 if (ec->ec_nvlans == 0) { 1777 IFNET_LOCK(ifp); 1778 (void)ether_disable_vlan_mtu(ifp); 1779 IFNET_UNLOCK(ifp); 1780 } 1781 1782 kmem_free(vidp, sizeof(*vidp)); 1783 1784 return 0; 1785 } 1786 1787 int 1788 ether_inject_vlantag(struct mbuf **mp, uint16_t etype, uint16_t tag) 1789 { 1790 static const size_t min_data_len = 1791 ETHER_MIN_LEN - ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1792 /* Used to pad ethernet frames with < ETHER_MIN_LEN bytes */ 1793 static const char vlan_zero_pad_buff[ETHER_MIN_LEN] = { 0 }; 1794 1795 struct ether_vlan_header *evl; 1796 struct mbuf *m = *mp; 1797 int error; 1798 1799 error = 0; 1800 1801 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT); 1802 if (m == NULL) { 1803 error = ENOBUFS; 1804 goto out; 1805 } 1806 1807 if (m->m_len < sizeof(*evl)) { 1808 m = m_pullup(m, sizeof(*evl)); 1809 if (m == NULL) { 1810 error = ENOBUFS; 1811 goto out; 1812 } 1813 } 1814 1815 /* 1816 * Transform the Ethernet header into an 1817 * Ethernet header with 802.1Q encapsulation. 1818 */ 1819 memmove(mtod(m, void *), 1820 mtod(m, char *) + ETHER_VLAN_ENCAP_LEN, 1821 sizeof(struct ether_header)); 1822 evl = mtod(m, struct ether_vlan_header *); 1823 evl->evl_proto = evl->evl_encap_proto; 1824 evl->evl_encap_proto = htons(etype); 1825 evl->evl_tag = htons(tag); 1826 1827 /* 1828 * To cater for VLAN-aware layer 2 ethernet 1829 * switches which may need to strip the tag 1830 * before forwarding the packet, make sure 1831 * the packet+tag is at least 68 bytes long. 1832 * This is necessary because our parent will 1833 * only pad to 64 bytes (ETHER_MIN_LEN) and 1834 * some switches will not pad by themselves 1835 * after deleting a tag. 1836 */ 1837 if (m->m_pkthdr.len < min_data_len) { 1838 m_copyback(m, m->m_pkthdr.len, 1839 min_data_len - m->m_pkthdr.len, 1840 vlan_zero_pad_buff); 1841 } 1842 1843 m->m_flags &= ~M_VLANTAG; 1844 1845 out: 1846 *mp = m; 1847 return error; 1848 } 1849 1850 struct mbuf * 1851 ether_strip_vlantag(struct mbuf *m) 1852 { 1853 struct ether_vlan_header *evl; 1854 1855 if (m->m_len < sizeof(*evl) && 1856 (m = m_pullup(m, sizeof(*evl))) == NULL) { 1857 return NULL; 1858 } 1859 1860 if (m_makewritable(&m, 0, sizeof(*evl), M_DONTWAIT)) { 1861 m_freem(m); 1862 return NULL; 1863 } 1864 1865 evl = mtod(m, struct ether_vlan_header *); 1866 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN); 1867 1868 vlan_set_tag(m, ntohs(evl->evl_tag)); 1869 1870 /* 1871 * Restore the original ethertype. We'll remove 1872 * the encapsulation after we've found the vlan 1873 * interface corresponding to the tag. 1874 */ 1875 evl->evl_encap_proto = evl->evl_proto; 1876 1877 /* 1878 * Remove the encapsulation header and append tag. 1879 * The original header has already been fixed up above. 1880 */ 1881 vlan_set_tag(m, ntohs(evl->evl_tag)); 1882 memmove((char *)evl + ETHER_VLAN_ENCAP_LEN, evl, 1883 offsetof(struct ether_vlan_header, evl_encap_proto)); 1884 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1885 1886 return m; 1887 } 1888 1889 static int 1890 ether_multicast_sysctl(SYSCTLFN_ARGS) 1891 { 1892 struct ether_multi *enm; 1893 struct ifnet *ifp; 1894 struct ethercom *ec; 1895 int error = 0; 1896 size_t written; 1897 struct psref psref; 1898 int bound; 1899 unsigned int multicnt; 1900 struct ether_multi_sysctl *addrs; 1901 int i; 1902 1903 if (namelen != 1) 1904 return EINVAL; 1905 1906 bound = curlwp_bind(); 1907 ifp = if_get_byindex(name[0], &psref); 1908 if (ifp == NULL) { 1909 error = ENODEV; 1910 goto out; 1911 } 1912 if (ifp->if_type != IFT_ETHER) { 1913 if_put(ifp, &psref); 1914 *oldlenp = 0; 1915 goto out; 1916 } 1917 ec = (struct ethercom *)ifp; 1918 1919 if (oldp == NULL) { 1920 if_put(ifp, &psref); 1921 *oldlenp = ec->ec_multicnt * sizeof(*addrs); 1922 goto out; 1923 } 1924 1925 /* 1926 * ec->ec_lock is a spin mutex so we cannot call sysctl_copyout, which 1927 * is sleepable, while holding it. Copy data to a local buffer first 1928 * with the lock taken and then call sysctl_copyout without holding it. 1929 */ 1930 retry: 1931 multicnt = ec->ec_multicnt; 1932 1933 if (multicnt == 0) { 1934 if_put(ifp, &psref); 1935 *oldlenp = 0; 1936 goto out; 1937 } 1938 1939 addrs = kmem_zalloc(sizeof(*addrs) * multicnt, KM_SLEEP); 1940 1941 ETHER_LOCK(ec); 1942 if (multicnt != ec->ec_multicnt) { 1943 /* The number of multicast addresses has changed */ 1944 ETHER_UNLOCK(ec); 1945 kmem_free(addrs, sizeof(*addrs) * multicnt); 1946 goto retry; 1947 } 1948 1949 i = 0; 1950 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1951 struct ether_multi_sysctl *addr = &addrs[i]; 1952 addr->enm_refcount = enm->enm_refcount; 1953 memcpy(addr->enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1954 memcpy(addr->enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1955 i++; 1956 } 1957 ETHER_UNLOCK(ec); 1958 1959 error = 0; 1960 written = 0; 1961 for (i = 0; i < multicnt; i++) { 1962 struct ether_multi_sysctl *addr = &addrs[i]; 1963 1964 if (written + sizeof(*addr) > *oldlenp) 1965 break; 1966 error = sysctl_copyout(l, addr, oldp, sizeof(*addr)); 1967 if (error) 1968 break; 1969 written += sizeof(*addr); 1970 oldp = (char *)oldp + sizeof(*addr); 1971 } 1972 kmem_free(addrs, sizeof(*addrs) * multicnt); 1973 1974 if_put(ifp, &psref); 1975 1976 *oldlenp = written; 1977 out: 1978 curlwp_bindx(bound); 1979 return error; 1980 } 1981 1982 static void 1983 ether_sysctl_setup(struct sysctllog **clog) 1984 { 1985 const struct sysctlnode *rnode = NULL; 1986 1987 sysctl_createv(clog, 0, NULL, &rnode, 1988 CTLFLAG_PERMANENT, 1989 CTLTYPE_NODE, "ether", 1990 SYSCTL_DESCR("Ethernet-specific information"), 1991 NULL, 0, NULL, 0, 1992 CTL_NET, CTL_CREATE, CTL_EOL); 1993 1994 sysctl_createv(clog, 0, &rnode, NULL, 1995 CTLFLAG_PERMANENT, 1996 CTLTYPE_NODE, "multicast", 1997 SYSCTL_DESCR("multicast addresses"), 1998 ether_multicast_sysctl, 0, NULL, 0, 1999 CTL_CREATE, CTL_EOL); 2000 2001 sysctl_createv(clog, 0, &rnode, NULL, 2002 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2003 CTLTYPE_STRING, "rps_hash", 2004 SYSCTL_DESCR("Interface rps hash function control"), 2005 sysctl_pktq_rps_hash_handler, 0, (void *)ðer_pktq_rps_hash_p, 2006 PKTQ_RPS_HASH_NAME_LEN, 2007 CTL_CREATE, CTL_EOL); 2008 } 2009 2010 void 2011 etherinit(void) 2012 { 2013 2014 #ifdef DIAGNOSTIC 2015 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); 2016 #endif 2017 ether_pktq_rps_hash_p = pktq_rps_hash_default; 2018 ether_sysctl_setup(NULL); 2019 } 2020
Indexes created Wed Sep 24 15:09:51 GMT 2025