if_ethersubr.c revision 1.278
1 /* $NetBSD: if_ethersubr.c,v 1.278 2019/10/02 04:17:16 msaitoh 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 1.278 2019/10/02 04:17:16 msaitoh 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/rnd.h> 89 #include <sys/rndsource.h> 90 #include <sys/cpu.h> 91 #include <sys/kmem.h> 92 93 #include <net/if.h> 94 #include <net/netisr.h> 95 #include <net/route.h> 96 #include <net/if_llc.h> 97 #include <net/if_dl.h> 98 #include <net/if_types.h> 99 #include <net/pktqueue.h> 100 101 #include <net/if_media.h> 102 #include <dev/mii/mii.h> 103 #include <dev/mii/miivar.h> 104 105 #if NARP == 0 106 /* 107 * XXX there should really be a way to issue this warning from within config(8) 108 */ 109 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. 110 #endif 111 112 #include <net/bpf.h> 113 114 #include <net/if_ether.h> 115 #include <net/if_vlanvar.h> 116 117 #if NPPPOE > 0 118 #include <net/if_pppoe.h> 119 #endif 120 121 #if NAGR > 0 122 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 123 #include <net/agr/ieee8023ad.h> 124 #include <net/agr/if_agrvar.h> 125 #endif 126 127 #if NBRIDGE > 0 128 #include <net/if_bridgevar.h> 129 #endif 130 131 #include <netinet/in.h> 132 #ifdef INET 133 #include <netinet/in_var.h> 134 #endif 135 #include <netinet/if_inarp.h> 136 137 #ifdef INET6 138 #ifndef INET 139 #include <netinet/in.h> 140 #endif 141 #include <netinet6/in6_var.h> 142 #include <netinet6/nd6.h> 143 #endif 144 145 #include "carp.h" 146 #if NCARP > 0 147 #include <netinet/ip_carp.h> 148 #endif 149 150 #ifdef NETATALK 151 #include <netatalk/at.h> 152 #include <netatalk/at_var.h> 153 #include <netatalk/at_extern.h> 154 155 #define llc_snap_org_code llc_un.type_snap.org_code 156 #define llc_snap_ether_type llc_un.type_snap.ether_type 157 158 extern u_char at_org_code[3]; 159 extern u_char aarp_org_code[3]; 160 #endif /* NETATALK */ 161 162 #ifdef MPLS 163 #include <netmpls/mpls.h> 164 #include <netmpls/mpls_var.h> 165 #endif 166 167 #ifdef DIAGNOSTIC 168 static struct timeval bigpktppslim_last; 169 static int bigpktppslim = 2; /* XXX */ 170 static int bigpktpps_count; 171 static kmutex_t bigpktpps_lock __cacheline_aligned; 172 #endif 173 174 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 175 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 176 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 177 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 178 #define senderr(e) { error = (e); goto bad;} 179 180 static int ether_output(struct ifnet *, struct mbuf *, 181 const struct sockaddr *, const struct rtentry *); 182 183 /* 184 * Ethernet output routine. 185 * Encapsulate a packet of type family for the local net. 186 * Assumes that ifp is actually pointer to ethercom structure. 187 */ 188 static int 189 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 190 const struct sockaddr * const dst, const struct rtentry *rt) 191 { 192 uint8_t esrc[ETHER_ADDR_LEN], edst[ETHER_ADDR_LEN]; 193 uint16_t etype = 0; 194 int error = 0, hdrcmplt = 0; 195 struct mbuf *m = m0; 196 struct mbuf *mcopy = NULL; 197 struct ether_header *eh; 198 struct ifnet *ifp = ifp0; 199 #ifdef INET 200 struct arphdr *ah; 201 #endif 202 #ifdef NETATALK 203 struct at_ifaddr *aa; 204 #endif 205 206 #ifdef MBUFTRACE 207 m_claimm(m, ifp->if_mowner); 208 #endif 209 210 #if NCARP > 0 211 if (ifp->if_type == IFT_CARP) { 212 struct ifaddr *ifa; 213 int s = pserialize_read_enter(); 214 215 /* loop back if this is going to the carp interface */ 216 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 217 (ifa = ifa_ifwithaddr(dst)) != NULL) { 218 if (ifa->ifa_ifp == ifp0) { 219 pserialize_read_exit(s); 220 return looutput(ifp0, m, dst, rt); 221 } 222 } 223 pserialize_read_exit(s); 224 225 ifp = ifp->if_carpdev; 226 /* ac = (struct arpcom *)ifp; */ 227 228 if ((ifp0->if_flags & (IFF_UP | IFF_RUNNING)) != 229 (IFF_UP | IFF_RUNNING)) 230 senderr(ENETDOWN); 231 } 232 #endif 233 234 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 235 senderr(ENETDOWN); 236 237 switch (dst->sa_family) { 238 239 #ifdef INET 240 case AF_INET: 241 if (m->m_flags & M_BCAST) { 242 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 243 } else if (m->m_flags & M_MCAST) { 244 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 245 } else { 246 error = arpresolve(ifp, rt, m, dst, edst, sizeof(edst)); 247 if (error) 248 return (error == EWOULDBLOCK) ? 0 : error; 249 } 250 /* If broadcasting on a simplex interface, loopback a copy */ 251 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 252 mcopy = m_copypacket(m, M_DONTWAIT); 253 etype = htons(ETHERTYPE_IP); 254 break; 255 256 case AF_ARP: 257 ah = mtod(m, struct arphdr *); 258 if (m->m_flags & M_BCAST) { 259 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 260 } else { 261 void *tha = ar_tha(ah); 262 263 if (tha == NULL) { 264 /* fake with ARPHRD_IEEE1394 */ 265 m_freem(m); 266 return 0; 267 } 268 memcpy(edst, tha, sizeof(edst)); 269 } 270 271 ah->ar_hrd = htons(ARPHRD_ETHER); 272 273 switch (ntohs(ah->ar_op)) { 274 case ARPOP_REVREQUEST: 275 case ARPOP_REVREPLY: 276 etype = htons(ETHERTYPE_REVARP); 277 break; 278 279 case ARPOP_REQUEST: 280 case ARPOP_REPLY: 281 default: 282 etype = htons(ETHERTYPE_ARP); 283 } 284 break; 285 #endif 286 287 #ifdef INET6 288 case AF_INET6: 289 if (m->m_flags & M_BCAST) { 290 memcpy(edst, etherbroadcastaddr, sizeof(edst)); 291 } else if (m->m_flags & M_MCAST) { 292 ETHER_MAP_IPV6_MULTICAST(&satocsin6(dst)->sin6_addr, 293 edst); 294 } else { 295 error = nd6_resolve(ifp, rt, m, dst, edst, 296 sizeof(edst)); 297 if (error) 298 return (error == EWOULDBLOCK) ? 0 : error; 299 } 300 etype = htons(ETHERTYPE_IPV6); 301 break; 302 #endif 303 304 #ifdef NETATALK 305 case AF_APPLETALK: { 306 struct ifaddr *ifa; 307 int s; 308 309 KERNEL_LOCK(1, NULL); 310 311 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 312 KERNEL_UNLOCK_ONE(NULL); 313 return 0; 314 } 315 316 /* 317 * ifaddr is the first thing in at_ifaddr 318 */ 319 s = pserialize_read_enter(); 320 ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); 321 if (ifa == NULL) { 322 pserialize_read_exit(s); 323 KERNEL_UNLOCK_ONE(NULL); 324 senderr(EADDRNOTAVAIL); 325 } 326 aa = (struct at_ifaddr *)ifa; 327 328 /* 329 * In the phase 2 case, we need to prepend an mbuf for the 330 * llc header. 331 */ 332 if (aa->aa_flags & AFA_PHASE2) { 333 struct llc llc; 334 335 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 336 if (m == NULL) { 337 pserialize_read_exit(s); 338 KERNEL_UNLOCK_ONE(NULL); 339 senderr(ENOBUFS); 340 } 341 342 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 343 llc.llc_control = LLC_UI; 344 memcpy(llc.llc_snap_org_code, at_org_code, 345 sizeof(llc.llc_snap_org_code)); 346 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 347 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 348 } else { 349 etype = htons(ETHERTYPE_ATALK); 350 } 351 pserialize_read_exit(s); 352 KERNEL_UNLOCK_ONE(NULL); 353 break; 354 } 355 #endif /* NETATALK */ 356 357 case pseudo_AF_HDRCMPLT: 358 hdrcmplt = 1; 359 memcpy(esrc, 360 ((const struct ether_header *)dst->sa_data)->ether_shost, 361 sizeof(esrc)); 362 /* FALLTHROUGH */ 363 364 case AF_UNSPEC: 365 memcpy(edst, 366 ((const struct ether_header *)dst->sa_data)->ether_dhost, 367 sizeof(edst)); 368 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 369 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 370 break; 371 372 default: 373 printf("%s: can't handle af%d\n", ifp->if_xname, 374 dst->sa_family); 375 senderr(EAFNOSUPPORT); 376 } 377 378 #ifdef MPLS 379 { 380 struct m_tag *mtag; 381 mtag = m_tag_find(m, PACKET_TAG_MPLS); 382 if (mtag != NULL) { 383 /* Having the tag itself indicates it's MPLS */ 384 etype = htons(ETHERTYPE_MPLS); 385 m_tag_delete(m, mtag); 386 } 387 } 388 #endif 389 390 if (mcopy) 391 (void)looutput(ifp, mcopy, dst, rt); 392 393 KASSERT((m->m_flags & M_PKTHDR) != 0); 394 395 /* 396 * If no ether type is set, this must be a 802.2 formatted packet. 397 */ 398 if (etype == 0) 399 etype = htons(m->m_pkthdr.len); 400 401 /* 402 * Add local net header. If no space in first mbuf, allocate another. 403 */ 404 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 405 if (m == NULL) 406 senderr(ENOBUFS); 407 408 eh = mtod(m, struct ether_header *); 409 /* Note: etype is already in network byte order. */ 410 memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 411 memcpy(eh->ether_dhost, edst, sizeof(edst)); 412 if (hdrcmplt) { 413 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 414 } else { 415 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 416 sizeof(eh->ether_shost)); 417 } 418 419 #if NCARP > 0 420 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 421 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 422 sizeof(eh->ether_shost)); 423 } 424 #endif 425 426 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 427 return error; 428 if (m == NULL) 429 return 0; 430 431 #if NBRIDGE > 0 432 /* 433 * Bridges require special output handling. 434 */ 435 if (ifp->if_bridge) 436 return bridge_output(ifp, m, NULL, NULL); 437 #endif 438 439 #if NCARP > 0 440 if (ifp != ifp0) 441 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 442 #endif 443 444 #ifdef ALTQ 445 KERNEL_LOCK(1, NULL); 446 /* 447 * If ALTQ is enabled on the parent interface, do 448 * classification; the queueing discipline might not 449 * require classification, but might require the 450 * address family/header pointer in the pktattr. 451 */ 452 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 453 altq_etherclassify(&ifp->if_snd, m); 454 KERNEL_UNLOCK_ONE(NULL); 455 #endif 456 return ifq_enqueue(ifp, m); 457 458 bad: 459 if (m) 460 m_freem(m); 461 return error; 462 } 463 464 #ifdef ALTQ 465 /* 466 * This routine is a slight hack to allow a packet to be classified 467 * if the Ethernet headers are present. It will go away when ALTQ's 468 * classification engine understands link headers. 469 * 470 * XXX: We may need to do m_pullups here. First to ensure struct ether_header 471 * is indeed contiguous, then to read the LLC and so on. 472 */ 473 void 474 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) 475 { 476 struct ether_header *eh; 477 struct mbuf *mtop = m; 478 uint16_t ether_type; 479 int hlen, af, hdrsize; 480 void *hdr; 481 482 KASSERT((mtop->m_flags & M_PKTHDR) != 0); 483 484 hlen = ETHER_HDR_LEN; 485 eh = mtod(m, struct ether_header *); 486 487 ether_type = htons(eh->ether_type); 488 489 if (ether_type < ETHERMTU) { 490 /* LLC/SNAP */ 491 struct llc *llc = (struct llc *)(eh + 1); 492 hlen += 8; 493 494 if (m->m_len < hlen || 495 llc->llc_dsap != LLC_SNAP_LSAP || 496 llc->llc_ssap != LLC_SNAP_LSAP || 497 llc->llc_control != LLC_UI) { 498 /* Not SNAP. */ 499 goto bad; 500 } 501 502 ether_type = htons(llc->llc_un.type_snap.ether_type); 503 } 504 505 switch (ether_type) { 506 case ETHERTYPE_IP: 507 af = AF_INET; 508 hdrsize = 20; /* sizeof(struct ip) */ 509 break; 510 511 case ETHERTYPE_IPV6: 512 af = AF_INET6; 513 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 514 break; 515 516 default: 517 af = AF_UNSPEC; 518 hdrsize = 0; 519 break; 520 } 521 522 while (m->m_len <= hlen) { 523 hlen -= m->m_len; 524 m = m->m_next; 525 if (m == NULL) 526 goto bad; 527 } 528 529 if (m->m_len < (hlen + hdrsize)) { 530 /* 531 * protocol header not in a single mbuf. 532 * We can't cope with this situation right 533 * now (but it shouldn't ever happen, really, anyhow). 534 */ 535 #ifdef DEBUG 536 printf("altq_etherclassify: headers span multiple mbufs: " 537 "%d < %d\n", m->m_len, (hlen + hdrsize)); 538 #endif 539 goto bad; 540 } 541 542 m->m_data += hlen; 543 m->m_len -= hlen; 544 545 hdr = mtod(m, void *); 546 547 if (ALTQ_NEEDS_CLASSIFY(ifq)) { 548 mtop->m_pkthdr.pattr_class = 549 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 550 } 551 mtop->m_pkthdr.pattr_af = af; 552 mtop->m_pkthdr.pattr_hdr = hdr; 553 554 m->m_data -= hlen; 555 m->m_len += hlen; 556 557 return; 558 559 bad: 560 mtop->m_pkthdr.pattr_class = NULL; 561 mtop->m_pkthdr.pattr_hdr = NULL; 562 mtop->m_pkthdr.pattr_af = AF_UNSPEC; 563 } 564 #endif /* ALTQ */ 565 566 /* 567 * Process a received Ethernet packet; 568 * the packet is in the mbuf chain m with 569 * the ether header. 570 */ 571 void 572 ether_input(struct ifnet *ifp, struct mbuf *m) 573 { 574 struct ethercom *ec = (struct ethercom *) ifp; 575 pktqueue_t *pktq = NULL; 576 struct ifqueue *inq = NULL; 577 uint16_t etype; 578 struct ether_header *eh; 579 size_t ehlen; 580 static int earlypkts; 581 int isr = 0; 582 #if defined (LLC) || defined(NETATALK) 583 struct llc *l; 584 #endif 585 586 KASSERT(!cpu_intr_p()); 587 KASSERT((m->m_flags & M_PKTHDR) != 0); 588 589 if ((ifp->if_flags & IFF_UP) == 0) { 590 m_freem(m); 591 return; 592 } 593 if (m->m_len < sizeof(*eh)) { 594 m = m_pullup(m, sizeof(*eh)); 595 if (m == NULL) 596 return; 597 } 598 599 #ifdef MBUFTRACE 600 m_claimm(m, &ec->ec_rx_mowner); 601 #endif 602 eh = mtod(m, struct ether_header *); 603 etype = ntohs(eh->ether_type); 604 ehlen = sizeof(*eh); 605 606 if (__predict_false(earlypkts < 100 || !rnd_initial_entropy)) { 607 rnd_add_data(NULL, eh, ehlen, 0); 608 earlypkts++; 609 } 610 611 /* 612 * Determine if the packet is within its size limits. For MPLS the 613 * header length is variable, so we skip the check. 614 */ 615 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 616 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 617 #ifdef DIAGNOSTIC 618 mutex_enter(&bigpktpps_lock); 619 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 620 bigpktppslim)) { 621 printf("%s: discarding oversize frame (len=%d)\n", 622 ifp->if_xname, m->m_pkthdr.len); 623 } 624 mutex_exit(&bigpktpps_lock); 625 #endif 626 ifp->if_iqdrops++; 627 m_freem(m); 628 return; 629 } 630 631 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 632 /* 633 * If this is not a simplex interface, drop the packet 634 * if it came from us. 635 */ 636 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 637 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 638 ETHER_ADDR_LEN) == 0) { 639 m_freem(m); 640 return; 641 } 642 643 if (memcmp(etherbroadcastaddr, 644 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 645 m->m_flags |= M_BCAST; 646 else 647 m->m_flags |= M_MCAST; 648 ifp->if_imcasts++; 649 } 650 651 /* If the CRC is still on the packet, trim it off. */ 652 if (m->m_flags & M_HASFCS) { 653 m_adj(m, -ETHER_CRC_LEN); 654 m->m_flags &= ~M_HASFCS; 655 } 656 657 ifp->if_ibytes += m->m_pkthdr.len; 658 659 #if NCARP > 0 660 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 661 /* 662 * Clear M_PROMISC, in case the packet comes from a 663 * vlan. 664 */ 665 m->m_flags &= ~M_PROMISC; 666 if (carp_input(m, (uint8_t *)&eh->ether_shost, 667 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 668 return; 669 } 670 #endif 671 672 if ((m->m_flags & (M_BCAST | M_MCAST | M_PROMISC)) == 0 && 673 (ifp->if_flags & IFF_PROMISC) != 0 && 674 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 675 ETHER_ADDR_LEN) != 0) { 676 m->m_flags |= M_PROMISC; 677 } 678 679 if ((m->m_flags & M_PROMISC) == 0) { 680 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 681 return; 682 if (m == NULL) 683 return; 684 685 eh = mtod(m, struct ether_header *); 686 etype = ntohs(eh->ether_type); 687 } 688 689 #if NAGR > 0 690 if (ifp->if_agrprivate && 691 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 692 m->m_flags &= ~M_PROMISC; 693 agr_input(ifp, m); 694 return; 695 } 696 #endif 697 698 /* 699 * If VLANs are configured on the interface, check to 700 * see if the device performed the decapsulation and 701 * provided us with the tag. 702 */ 703 if (ec->ec_nvlans && vlan_has_tag(m)) { 704 #if NVLAN > 0 705 /* 706 * vlan_input() will either recursively call ether_input() 707 * or drop the packet. 708 */ 709 vlan_input(ifp, m); 710 #else 711 m_freem(m); 712 #endif 713 return; 714 } 715 716 /* 717 * Handle protocols that expect to have the Ethernet header 718 * (and possibly FCS) intact. 719 */ 720 switch (etype) { 721 case ETHERTYPE_VLAN: { 722 struct ether_vlan_header *evl = (void *)eh; 723 724 /* 725 * If there is a tag of 0, then the VLAN header was probably 726 * just being used to store the priority. Extract the ether 727 * type, and if IP or IPV6, let them deal with it. 728 */ 729 if (m->m_len >= sizeof(*evl) && 730 EVL_VLANOFTAG(evl->evl_tag) == 0) { 731 etype = ntohs(evl->evl_proto); 732 ehlen = sizeof(*evl); 733 if ((m->m_flags & M_PROMISC) == 0 && 734 (etype == ETHERTYPE_IP || 735 etype == ETHERTYPE_IPV6)) 736 break; 737 } 738 739 #if NVLAN > 0 740 /* 741 * vlan_input() will either recursively call ether_input() 742 * or drop the packet. 743 */ 744 if (ec->ec_nvlans != 0) 745 vlan_input(ifp, m); 746 else 747 #endif 748 m_freem(m); 749 750 return; 751 } 752 753 #if NPPPOE > 0 754 case ETHERTYPE_PPPOEDISC: 755 pppoedisc_input(ifp, m); 756 return; 757 758 case ETHERTYPE_PPPOE: 759 pppoe_input(ifp, m); 760 return; 761 #endif 762 763 case ETHERTYPE_SLOWPROTOCOLS: { 764 uint8_t subtype; 765 766 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 767 m_freem(m); 768 return; 769 } 770 771 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 772 switch (subtype) { 773 #if NAGR > 0 774 case SLOWPROTOCOLS_SUBTYPE_LACP: 775 if (ifp->if_agrprivate) { 776 ieee8023ad_lacp_input(ifp, m); 777 return; 778 } 779 break; 780 781 case SLOWPROTOCOLS_SUBTYPE_MARKER: 782 if (ifp->if_agrprivate) { 783 ieee8023ad_marker_input(ifp, m); 784 return; 785 } 786 break; 787 #endif 788 789 default: 790 if (subtype == 0 || subtype > 10) { 791 /* illegal value */ 792 m_freem(m); 793 return; 794 } 795 /* unknown subtype */ 796 break; 797 } 798 } 799 /* FALLTHROUGH */ 800 default: 801 if (m->m_flags & M_PROMISC) { 802 m_freem(m); 803 return; 804 } 805 } 806 807 /* If the CRC is still on the packet, trim it off. */ 808 if (m->m_flags & M_HASFCS) { 809 m_adj(m, -ETHER_CRC_LEN); 810 m->m_flags &= ~M_HASFCS; 811 } 812 813 if (etype > ETHERMTU + sizeof(struct ether_header)) { 814 /* Strip off the Ethernet header. */ 815 m_adj(m, ehlen); 816 817 switch (etype) { 818 #ifdef INET 819 case ETHERTYPE_IP: 820 #ifdef GATEWAY 821 if (ipflow_fastforward(m)) 822 return; 823 #endif 824 pktq = ip_pktq; 825 break; 826 827 case ETHERTYPE_ARP: 828 isr = NETISR_ARP; 829 inq = &arpintrq; 830 break; 831 832 case ETHERTYPE_REVARP: 833 revarpinput(m); /* XXX queue? */ 834 return; 835 #endif 836 837 #ifdef INET6 838 case ETHERTYPE_IPV6: 839 if (__predict_false(!in6_present)) { 840 m_freem(m); 841 return; 842 } 843 #ifdef GATEWAY 844 if (ip6flow_fastforward(&m)) 845 return; 846 #endif 847 pktq = ip6_pktq; 848 break; 849 #endif 850 851 #ifdef NETATALK 852 case ETHERTYPE_ATALK: 853 isr = NETISR_ATALK; 854 inq = &atintrq1; 855 break; 856 857 case ETHERTYPE_AARP: 858 aarpinput(ifp, m); /* XXX queue? */ 859 return; 860 #endif 861 862 #ifdef MPLS 863 case ETHERTYPE_MPLS: 864 isr = NETISR_MPLS; 865 inq = &mplsintrq; 866 break; 867 #endif 868 869 default: 870 m_freem(m); 871 return; 872 } 873 } else { 874 KASSERT(ehlen == sizeof(*eh)); 875 #if defined (LLC) || defined (NETATALK) 876 if (m->m_len < sizeof(*eh) + sizeof(struct llc)) { 877 goto dropanyway; 878 } 879 l = (struct llc *)(eh+1); 880 881 switch (l->llc_dsap) { 882 #ifdef NETATALK 883 case LLC_SNAP_LSAP: 884 switch (l->llc_control) { 885 case LLC_UI: 886 if (l->llc_ssap != LLC_SNAP_LSAP) { 887 goto dropanyway; 888 } 889 890 if (memcmp(&(l->llc_snap_org_code)[0], 891 at_org_code, sizeof(at_org_code)) == 0 && 892 ntohs(l->llc_snap_ether_type) == 893 ETHERTYPE_ATALK) { 894 inq = &atintrq2; 895 m_adj(m, sizeof(struct ether_header) 896 + sizeof(struct llc)); 897 isr = NETISR_ATALK; 898 break; 899 } 900 901 if (memcmp(&(l->llc_snap_org_code)[0], 902 aarp_org_code, 903 sizeof(aarp_org_code)) == 0 && 904 ntohs(l->llc_snap_ether_type) == 905 ETHERTYPE_AARP) { 906 m_adj(m, sizeof(struct ether_header) 907 + sizeof(struct llc)); 908 aarpinput(ifp, m); /* XXX queue? */ 909 return; 910 } 911 912 default: 913 goto dropanyway; 914 } 915 break; 916 #endif 917 dropanyway: 918 default: 919 m_freem(m); 920 return; 921 } 922 #else /* LLC || NETATALK */ 923 m_freem(m); 924 return; 925 #endif /* LLC || NETATALK */ 926 } 927 928 if (__predict_true(pktq)) { 929 #ifdef NET_MPSAFE 930 const u_int h = curcpu()->ci_index; 931 #else 932 const uint32_t h = pktq_rps_hash(m); 933 #endif 934 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 935 m_freem(m); 936 } 937 return; 938 } 939 940 if (__predict_false(!inq)) { 941 /* Should not happen. */ 942 m_freem(m); 943 return; 944 } 945 946 IFQ_LOCK(inq); 947 if (IF_QFULL(inq)) { 948 IF_DROP(inq); 949 IFQ_UNLOCK(inq); 950 m_freem(m); 951 } else { 952 IF_ENQUEUE(inq, m); 953 IFQ_UNLOCK(inq); 954 schednetisr(isr); 955 } 956 } 957 958 /* 959 * Convert Ethernet address to printable (loggable) representation. 960 */ 961 char * 962 ether_sprintf(const u_char *ap) 963 { 964 static char etherbuf[3 * ETHER_ADDR_LEN]; 965 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 966 } 967 968 char * 969 ether_snprintf(char *buf, size_t len, const u_char *ap) 970 { 971 char *cp = buf; 972 size_t i; 973 974 for (i = 0; i < len / 3; i++) { 975 *cp++ = hexdigits[*ap >> 4]; 976 *cp++ = hexdigits[*ap++ & 0xf]; 977 *cp++ = ':'; 978 } 979 *--cp = '\0'; 980 return buf; 981 } 982 983 /* 984 * Perform common duties while attaching to interface list 985 */ 986 void 987 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 988 { 989 struct ethercom *ec = (struct ethercom *)ifp; 990 991 ifp->if_type = IFT_ETHER; 992 ifp->if_hdrlen = ETHER_HDR_LEN; 993 ifp->if_dlt = DLT_EN10MB; 994 ifp->if_mtu = ETHERMTU; 995 ifp->if_output = ether_output; 996 ifp->_if_input = ether_input; 997 if (ifp->if_baudrate == 0) 998 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 999 1000 if (lla != NULL) 1001 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1002 1003 LIST_INIT(&ec->ec_multiaddrs); 1004 SIMPLEQ_INIT(&ec->ec_vids); 1005 ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 1006 ec->ec_flags = 0; 1007 ifp->if_broadcastaddr = etherbroadcastaddr; 1008 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1009 #ifdef MBUFTRACE 1010 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1011 sizeof(ec->ec_tx_mowner.mo_name)); 1012 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1013 sizeof(ec->ec_tx_mowner.mo_descr)); 1014 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1015 sizeof(ec->ec_rx_mowner.mo_name)); 1016 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1017 sizeof(ec->ec_rx_mowner.mo_descr)); 1018 MOWNER_ATTACH(&ec->ec_tx_mowner); 1019 MOWNER_ATTACH(&ec->ec_rx_mowner); 1020 ifp->if_mowner = &ec->ec_tx_mowner; 1021 #endif 1022 } 1023 1024 void 1025 ether_ifdetach(struct ifnet *ifp) 1026 { 1027 struct ethercom *ec = (void *) ifp; 1028 struct ether_multi *enm; 1029 1030 IFNET_ASSERT_UNLOCKED(ifp); 1031 /* 1032 * Prevent further calls to ioctl (for example turning off 1033 * promiscuous mode from the bridge code), which eventually can 1034 * call if_init() which can cause panics because the interface 1035 * is in the process of being detached. Return device not configured 1036 * instead. 1037 */ 1038 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1039 1040 #if NBRIDGE > 0 1041 if (ifp->if_bridge) 1042 bridge_ifdetach(ifp); 1043 #endif 1044 bpf_detach(ifp); 1045 #if NVLAN > 0 1046 if (ec->ec_nvlans) 1047 vlan_ifdetach(ifp); 1048 #endif 1049 1050 ETHER_LOCK(ec); 1051 KASSERT(ec->ec_nvlans == 0); 1052 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1053 LIST_REMOVE(enm, enm_list); 1054 kmem_free(enm, sizeof(*enm)); 1055 ec->ec_multicnt--; 1056 } 1057 ETHER_UNLOCK(ec); 1058 1059 mutex_obj_free(ec->ec_lock); 1060 ec->ec_lock = NULL; 1061 1062 ifp->if_mowner = NULL; 1063 MOWNER_DETACH(&ec->ec_rx_mowner); 1064 MOWNER_DETACH(&ec->ec_tx_mowner); 1065 } 1066 1067 #if 0 1068 /* 1069 * This is for reference. We have a table-driven version 1070 * of the little-endian crc32 generator, which is faster 1071 * than the double-loop. 1072 */ 1073 uint32_t 1074 ether_crc32_le(const uint8_t *buf, size_t len) 1075 { 1076 uint32_t c, crc, carry; 1077 size_t i, j; 1078 1079 crc = 0xffffffffU; /* initial value */ 1080 1081 for (i = 0; i < len; i++) { 1082 c = buf[i]; 1083 for (j = 0; j < 8; j++) { 1084 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1085 crc >>= 1; 1086 c >>= 1; 1087 if (carry) 1088 crc = (crc ^ ETHER_CRC_POLY_LE); 1089 } 1090 } 1091 1092 return (crc); 1093 } 1094 #else 1095 uint32_t 1096 ether_crc32_le(const uint8_t *buf, size_t len) 1097 { 1098 static const uint32_t crctab[] = { 1099 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1100 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1101 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1102 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1103 }; 1104 uint32_t crc; 1105 size_t i; 1106 1107 crc = 0xffffffffU; /* initial value */ 1108 1109 for (i = 0; i < len; i++) { 1110 crc ^= buf[i]; 1111 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1112 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1113 } 1114 1115 return (crc); 1116 } 1117 #endif 1118 1119 uint32_t 1120 ether_crc32_be(const uint8_t *buf, size_t len) 1121 { 1122 uint32_t c, crc, carry; 1123 size_t i, j; 1124 1125 crc = 0xffffffffU; /* initial value */ 1126 1127 for (i = 0; i < len; i++) { 1128 c = buf[i]; 1129 for (j = 0; j < 8; j++) { 1130 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1131 crc <<= 1; 1132 c >>= 1; 1133 if (carry) 1134 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1135 } 1136 } 1137 1138 return (crc); 1139 } 1140 1141 #ifdef INET 1142 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1143 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1144 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1145 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1146 #endif 1147 #ifdef INET6 1148 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1149 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1150 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1151 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1152 #endif 1153 1154 /* 1155 * ether_aton implementation, not using a static buffer. 1156 */ 1157 int 1158 ether_aton_r(u_char *dest, size_t len, const char *str) 1159 { 1160 const u_char *cp = (const void *)str; 1161 u_char *ep; 1162 1163 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1164 1165 if (len < ETHER_ADDR_LEN) 1166 return ENOSPC; 1167 1168 ep = dest + ETHER_ADDR_LEN; 1169 1170 while (*cp) { 1171 if (!isxdigit(*cp)) 1172 return EINVAL; 1173 1174 *dest = atox(*cp); 1175 cp++; 1176 if (isxdigit(*cp)) { 1177 *dest = (*dest << 4) | atox(*cp); 1178 cp++; 1179 } 1180 dest++; 1181 1182 if (dest == ep) 1183 return (*cp == '\0') ? 0 : ENAMETOOLONG; 1184 1185 switch (*cp) { 1186 case ':': 1187 case '-': 1188 case '.': 1189 cp++; 1190 break; 1191 } 1192 } 1193 return ENOBUFS; 1194 } 1195 1196 /* 1197 * Convert a sockaddr into an Ethernet address or range of Ethernet 1198 * addresses. 1199 */ 1200 int 1201 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1202 uint8_t addrhi[ETHER_ADDR_LEN]) 1203 { 1204 #ifdef INET 1205 const struct sockaddr_in *sin; 1206 #endif 1207 #ifdef INET6 1208 const struct sockaddr_in6 *sin6; 1209 #endif 1210 1211 switch (sa->sa_family) { 1212 1213 case AF_UNSPEC: 1214 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1215 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1216 break; 1217 1218 #ifdef INET 1219 case AF_INET: 1220 sin = satocsin(sa); 1221 if (sin->sin_addr.s_addr == INADDR_ANY) { 1222 /* 1223 * An IP address of INADDR_ANY means listen to 1224 * or stop listening to all of the Ethernet 1225 * multicast addresses used for IP. 1226 * (This is for the sake of IP multicast routers.) 1227 */ 1228 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1229 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1230 } else { 1231 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1232 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1233 } 1234 break; 1235 #endif 1236 #ifdef INET6 1237 case AF_INET6: 1238 sin6 = satocsin6(sa); 1239 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1240 /* 1241 * An IP6 address of 0 means listen to or stop 1242 * listening to all of the Ethernet multicast 1243 * address used for IP6. 1244 * (This is used for multicast routers.) 1245 */ 1246 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1247 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1248 } else { 1249 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1250 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1251 } 1252 break; 1253 #endif 1254 1255 default: 1256 return EAFNOSUPPORT; 1257 } 1258 return 0; 1259 } 1260 1261 /* 1262 * Add an Ethernet multicast address or range of addresses to the list for a 1263 * given interface. 1264 */ 1265 int 1266 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1267 { 1268 struct ether_multi *enm, *_enm; 1269 u_char addrlo[ETHER_ADDR_LEN]; 1270 u_char addrhi[ETHER_ADDR_LEN]; 1271 int error = 0; 1272 1273 /* Allocate out of lock */ 1274 enm = kmem_alloc(sizeof(*enm), KM_SLEEP); 1275 1276 ETHER_LOCK(ec); 1277 error = ether_multiaddr(sa, addrlo, addrhi); 1278 if (error != 0) 1279 goto out; 1280 1281 /* 1282 * Verify that we have valid Ethernet multicast addresses. 1283 */ 1284 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1285 error = EINVAL; 1286 goto out; 1287 } 1288 1289 /* 1290 * See if the address range is already in the list. 1291 */ 1292 _enm = ether_lookup_multi(addrlo, addrhi, ec); 1293 if (_enm != NULL) { 1294 /* 1295 * Found it; just increment the reference count. 1296 */ 1297 ++_enm->enm_refcount; 1298 error = 0; 1299 goto out; 1300 } 1301 1302 /* 1303 * Link a new multicast record into the interface's multicast list. 1304 */ 1305 memcpy(enm->enm_addrlo, addrlo, ETHER_ADDR_LEN); 1306 memcpy(enm->enm_addrhi, addrhi, ETHER_ADDR_LEN); 1307 enm->enm_refcount = 1; 1308 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1309 ec->ec_multicnt++; 1310 1311 /* 1312 * Return ENETRESET to inform the driver that the list has changed 1313 * and its reception filter should be adjusted accordingly. 1314 */ 1315 error = ENETRESET; 1316 enm = NULL; 1317 1318 out: 1319 ETHER_UNLOCK(ec); 1320 if (enm != NULL) 1321 kmem_free(enm, sizeof(*enm)); 1322 return error; 1323 } 1324 1325 /* 1326 * Delete a multicast address record. 1327 */ 1328 int 1329 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1330 { 1331 struct ether_multi *enm; 1332 u_char addrlo[ETHER_ADDR_LEN]; 1333 u_char addrhi[ETHER_ADDR_LEN]; 1334 int error; 1335 1336 ETHER_LOCK(ec); 1337 error = ether_multiaddr(sa, addrlo, addrhi); 1338 if (error != 0) 1339 goto error; 1340 1341 /* 1342 * Look up the address in our list. 1343 */ 1344 enm = ether_lookup_multi(addrlo, addrhi, ec); 1345 if (enm == NULL) { 1346 error = ENXIO; 1347 goto error; 1348 } 1349 if (--enm->enm_refcount != 0) { 1350 /* 1351 * Still some claims to this record. 1352 */ 1353 error = 0; 1354 goto error; 1355 } 1356 1357 /* 1358 * No remaining claims to this record; unlink and free it. 1359 */ 1360 LIST_REMOVE(enm, enm_list); 1361 ec->ec_multicnt--; 1362 ETHER_UNLOCK(ec); 1363 kmem_free(enm, sizeof(*enm)); 1364 1365 /* 1366 * Return ENETRESET to inform the driver that the list has changed 1367 * and its reception filter should be adjusted accordingly. 1368 */ 1369 return ENETRESET; 1370 1371 error: 1372 ETHER_UNLOCK(ec); 1373 return error; 1374 } 1375 1376 void 1377 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1378 { 1379 ec->ec_ifflags_cb = cb; 1380 } 1381 1382 void 1383 ether_set_vlan_cb(struct ethercom *ec, ether_vlancb_t cb) 1384 { 1385 1386 ec->ec_vlan_cb = cb; 1387 } 1388 1389 static int 1390 ether_ioctl_reinit(struct ethercom *ec) 1391 { 1392 struct ifnet *ifp = &ec->ec_if; 1393 int error; 1394 1395 switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { 1396 case IFF_RUNNING: 1397 /* 1398 * If interface is marked down and it is running, 1399 * then stop and disable it. 1400 */ 1401 (*ifp->if_stop)(ifp, 1); 1402 break; 1403 case IFF_UP: 1404 /* 1405 * If interface is marked up and it is stopped, then 1406 * start it. 1407 */ 1408 return (*ifp->if_init)(ifp); 1409 case IFF_UP | IFF_RUNNING: 1410 error = 0; 1411 if (ec->ec_ifflags_cb != NULL) { 1412 error = (*ec->ec_ifflags_cb)(ec); 1413 if (error == ENETRESET) { 1414 /* 1415 * Reset the interface to pick up 1416 * changes in any other flags that 1417 * affect the hardware state. 1418 */ 1419 return (*ifp->if_init)(ifp); 1420 } 1421 } else 1422 error = (*ifp->if_init)(ifp); 1423 return error; 1424 case 0: 1425 break; 1426 } 1427 1428 return 0; 1429 } 1430 1431 /* 1432 * Common ioctls for Ethernet interfaces. Note, we must be 1433 * called at splnet(). 1434 */ 1435 int 1436 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1437 { 1438 struct ethercom *ec = (void *)ifp; 1439 struct eccapreq *eccr; 1440 struct ifreq *ifr = (struct ifreq *)data; 1441 struct if_laddrreq *iflr = data; 1442 const struct sockaddr_dl *sdl; 1443 static const uint8_t zero[ETHER_ADDR_LEN]; 1444 int error; 1445 1446 switch (cmd) { 1447 case SIOCINITIFADDR: 1448 { 1449 struct ifaddr *ifa = (struct ifaddr *)data; 1450 if (ifa->ifa_addr->sa_family != AF_LINK 1451 && (ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 1452 (IFF_UP | IFF_RUNNING)) { 1453 ifp->if_flags |= IFF_UP; 1454 if ((error = (*ifp->if_init)(ifp)) != 0) 1455 return error; 1456 } 1457 #ifdef INET 1458 if (ifa->ifa_addr->sa_family == AF_INET) 1459 arp_ifinit(ifp, ifa); 1460 #endif 1461 return 0; 1462 } 1463 1464 case SIOCSIFMTU: 1465 { 1466 int maxmtu; 1467 1468 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1469 maxmtu = ETHERMTU_JUMBO; 1470 else 1471 maxmtu = ETHERMTU; 1472 1473 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1474 return EINVAL; 1475 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1476 return error; 1477 else if (ifp->if_flags & IFF_UP) { 1478 /* Make sure the device notices the MTU change. */ 1479 return (*ifp->if_init)(ifp); 1480 } else 1481 return 0; 1482 } 1483 1484 case SIOCSIFFLAGS: 1485 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1486 return error; 1487 return ether_ioctl_reinit(ec); 1488 case SIOCGIFFLAGS: 1489 error = ifioctl_common(ifp, cmd, data); 1490 if (error == 0) { 1491 /* Set IFF_ALLMULTI for backcompat */ 1492 ifr->ifr_flags |= (ec->ec_flags & ETHER_F_ALLMULTI) ? 1493 IFF_ALLMULTI : 0; 1494 } 1495 return error; 1496 case SIOCGETHERCAP: 1497 eccr = (struct eccapreq *)data; 1498 eccr->eccr_capabilities = ec->ec_capabilities; 1499 eccr->eccr_capenable = ec->ec_capenable; 1500 return 0; 1501 case SIOCSETHERCAP: 1502 eccr = (struct eccapreq *)data; 1503 if ((eccr->eccr_capenable & ~ec->ec_capabilities) != 0) 1504 return EINVAL; 1505 if (eccr->eccr_capenable == ec->ec_capenable) 1506 return 0; 1507 #if 0 /* notyet */ 1508 ec->ec_capenable = (ec->ec_capenable & ETHERCAP_CANTCHANGE) 1509 | (eccr->eccr_capenable & ~ETHERCAP_CANTCHANGE); 1510 #else 1511 ec->ec_capenable = eccr->eccr_capenable; 1512 #endif 1513 return ether_ioctl_reinit(ec); 1514 case SIOCADDMULTI: 1515 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1516 case SIOCDELMULTI: 1517 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1518 case SIOCSIFMEDIA: 1519 case SIOCGIFMEDIA: 1520 if (ec->ec_mii != NULL) 1521 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, 1522 cmd); 1523 else if (ec->ec_ifmedia != NULL) 1524 return ifmedia_ioctl(ifp, ifr, ec->ec_ifmedia, cmd); 1525 else 1526 return ENOTTY; 1527 break; 1528 case SIOCALIFADDR: 1529 sdl = satocsdl(sstocsa(&iflr->addr)); 1530 if (sdl->sdl_family != AF_LINK) 1531 ; 1532 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1533 return EINVAL; 1534 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1535 return EINVAL; 1536 /*FALLTHROUGH*/ 1537 default: 1538 return ifioctl_common(ifp, cmd, data); 1539 } 1540 return 0; 1541 } 1542 1543 /* 1544 * Enable/disable passing VLAN packets if the parent interface supports it. 1545 * Return: 1546 * 0: Ok 1547 * -1: Parent interface does not support vlans 1548 * >0: Error 1549 */ 1550 int 1551 ether_enable_vlan_mtu(struct ifnet *ifp) 1552 { 1553 int error; 1554 struct ethercom *ec = (void *)ifp; 1555 1556 /* Parent does not support VLAN's */ 1557 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) 1558 return -1; 1559 1560 /* 1561 * Parent supports the VLAN_MTU capability, 1562 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; 1563 * enable it. 1564 */ 1565 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1566 1567 /* Interface is down, defer for later */ 1568 if ((ifp->if_flags & IFF_UP) == 0) 1569 return 0; 1570 1571 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1572 return 0; 1573 1574 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1575 return error; 1576 } 1577 1578 int 1579 ether_disable_vlan_mtu(struct ifnet *ifp) 1580 { 1581 int error; 1582 struct ethercom *ec = (void *)ifp; 1583 1584 /* We still have VLAN's, defer for later */ 1585 if (ec->ec_nvlans != 0) 1586 return 0; 1587 1588 /* Parent does not support VLAB's, nothing to do. */ 1589 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) 1590 return -1; 1591 1592 /* 1593 * Disable Tx/Rx of VLAN-sized frames. 1594 */ 1595 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1596 1597 /* Interface is down, defer for later */ 1598 if ((ifp->if_flags & IFF_UP) == 0) 1599 return 0; 1600 1601 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1602 return 0; 1603 1604 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1605 return error; 1606 } 1607 1608 static int 1609 ether_multicast_sysctl(SYSCTLFN_ARGS) 1610 { 1611 struct ether_multi *enm; 1612 struct ifnet *ifp; 1613 struct ethercom *ec; 1614 int error = 0; 1615 size_t written; 1616 struct psref psref; 1617 int bound; 1618 unsigned int multicnt; 1619 struct ether_multi_sysctl *addrs; 1620 int i; 1621 1622 if (namelen != 1) 1623 return EINVAL; 1624 1625 bound = curlwp_bind(); 1626 ifp = if_get_byindex(name[0], &psref); 1627 if (ifp == NULL) { 1628 error = ENODEV; 1629 goto out; 1630 } 1631 if (ifp->if_type != IFT_ETHER) { 1632 if_put(ifp, &psref); 1633 *oldlenp = 0; 1634 goto out; 1635 } 1636 ec = (struct ethercom *)ifp; 1637 1638 if (oldp == NULL) { 1639 if_put(ifp, &psref); 1640 *oldlenp = ec->ec_multicnt * sizeof(*addrs); 1641 goto out; 1642 } 1643 1644 /* 1645 * ec->ec_lock is a spin mutex so we cannot call sysctl_copyout, which 1646 * is sleepable, while holding it. Copy data to a local buffer first 1647 * with the lock taken and then call sysctl_copyout without holding it. 1648 */ 1649 retry: 1650 multicnt = ec->ec_multicnt; 1651 1652 if (multicnt == 0) { 1653 if_put(ifp, &psref); 1654 *oldlenp = 0; 1655 goto out; 1656 } 1657 1658 addrs = kmem_zalloc(sizeof(*addrs) * multicnt, KM_SLEEP); 1659 1660 ETHER_LOCK(ec); 1661 if (multicnt != ec->ec_multicnt) { 1662 /* The number of multicast addresses has changed */ 1663 ETHER_UNLOCK(ec); 1664 kmem_free(addrs, sizeof(*addrs) * multicnt); 1665 goto retry; 1666 } 1667 1668 i = 0; 1669 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1670 struct ether_multi_sysctl *addr = &addrs[i]; 1671 addr->enm_refcount = enm->enm_refcount; 1672 memcpy(addr->enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1673 memcpy(addr->enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1674 i++; 1675 } 1676 ETHER_UNLOCK(ec); 1677 1678 error = 0; 1679 written = 0; 1680 for (i = 0; i < multicnt; i++) { 1681 struct ether_multi_sysctl *addr = &addrs[i]; 1682 1683 if (written + sizeof(*addr) > *oldlenp) 1684 break; 1685 error = sysctl_copyout(l, addr, oldp, sizeof(*addr)); 1686 if (error) 1687 break; 1688 written += sizeof(*addr); 1689 oldp = (char *)oldp + sizeof(*addr); 1690 } 1691 kmem_free(addrs, sizeof(*addrs) * multicnt); 1692 1693 if_put(ifp, &psref); 1694 1695 *oldlenp = written; 1696 out: 1697 curlwp_bindx(bound); 1698 return error; 1699 } 1700 1701 static void 1702 ether_sysctl_setup(struct sysctllog **clog) 1703 { 1704 const struct sysctlnode *rnode = NULL; 1705 1706 sysctl_createv(clog, 0, NULL, &rnode, 1707 CTLFLAG_PERMANENT, 1708 CTLTYPE_NODE, "ether", 1709 SYSCTL_DESCR("Ethernet-specific information"), 1710 NULL, 0, NULL, 0, 1711 CTL_NET, CTL_CREATE, CTL_EOL); 1712 1713 sysctl_createv(clog, 0, &rnode, NULL, 1714 CTLFLAG_PERMANENT, 1715 CTLTYPE_NODE, "multicast", 1716 SYSCTL_DESCR("multicast addresses"), 1717 ether_multicast_sysctl, 0, NULL, 0, 1718 CTL_CREATE, CTL_EOL); 1719 } 1720 1721 void 1722 etherinit(void) 1723 { 1724 1725 #ifdef DIAGNOSTIC 1726 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); 1727 #endif 1728 ether_sysctl_setup(NULL); 1729 } 1730
Indexes created Tue Sep 23 14:10:03 GMT 2025