if_ethersubr.c revision 1.239
1 /* $NetBSD: if_ethersubr.c,v 1.239 2017/02/21 03:59:31 ozaki-r Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.239 2017/02/21 03:59:31 ozaki-r Exp $"); 65 66 #ifdef _KERNEL_OPT 67 #include "opt_inet.h" 68 #include "opt_atalk.h" 69 #include "opt_mbuftrace.h" 70 #include "opt_mpls.h" 71 #include "opt_gateway.h" 72 #include "opt_pppoe.h" 73 #include "opt_net_mpsafe.h" 74 #endif 75 76 #include "vlan.h" 77 #include "pppoe.h" 78 #include "bridge.h" 79 #include "arp.h" 80 #include "agr.h" 81 82 #include <sys/sysctl.h> 83 #include <sys/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 144 145 146 #include "carp.h" 147 #if NCARP > 0 148 #include <netinet/ip_carp.h> 149 #endif 150 151 #ifdef NETATALK 152 #include <netatalk/at.h> 153 #include <netatalk/at_var.h> 154 #include <netatalk/at_extern.h> 155 156 #define llc_snap_org_code llc_un.type_snap.org_code 157 #define llc_snap_ether_type llc_un.type_snap.ether_type 158 159 extern u_char at_org_code[3]; 160 extern u_char aarp_org_code[3]; 161 #endif /* NETATALK */ 162 163 #ifdef MPLS 164 #include <netmpls/mpls.h> 165 #include <netmpls/mpls_var.h> 166 #endif 167 168 static struct timeval bigpktppslim_last; 169 static int bigpktppslim = 2; /* XXX */ 170 static int bigpktpps_count; 171 static kmutex_t bigpktpps_lock __cacheline_aligned; 172 173 174 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 175 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 176 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 177 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 178 #define senderr(e) { error = (e); goto bad;} 179 180 static int ether_output(struct ifnet *, struct mbuf *, 181 const struct sockaddr *, const struct rtentry *); 182 183 /* 184 * Ethernet output routine. 185 * Encapsulate a packet of type family for the local net. 186 * Assumes that ifp is actually pointer to ethercom structure. 187 */ 188 static int 189 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 190 const struct sockaddr * const dst, 191 const struct rtentry *rt) 192 { 193 uint16_t etype = 0; 194 int error = 0, hdrcmplt = 0; 195 uint8_t esrc[6], edst[6]; 196 struct mbuf *m = m0; 197 struct mbuf *mcopy = NULL; 198 struct ether_header *eh; 199 struct ifnet *ifp = ifp0; 200 #ifdef INET 201 struct arphdr *ah; 202 #endif /* INET */ 203 #ifdef NETATALK 204 struct at_ifaddr *aa; 205 #endif /* NETATALK */ 206 207 /* 208 * some paths such as carp_output() call ethr_output() with "ifp" 209 * argument as other than ether ifnet. 210 */ 211 KASSERT(ifp->if_output != ether_output 212 || ifp->if_extflags & IFEF_OUTPUT_MPSAFE); 213 214 #ifdef MBUFTRACE 215 m_claimm(m, ifp->if_mowner); 216 #endif 217 218 #if NCARP > 0 219 if (ifp->if_type == IFT_CARP) { 220 struct ifaddr *ifa; 221 int s = pserialize_read_enter(); 222 223 /* loop back if this is going to the carp interface */ 224 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 225 (ifa = ifa_ifwithaddr(dst)) != NULL) { 226 if (ifa->ifa_ifp == ifp0) { 227 pserialize_read_exit(s); 228 return looutput(ifp0, m, dst, rt); 229 } 230 } 231 pserialize_read_exit(s); 232 233 ifp = ifp->if_carpdev; 234 /* ac = (struct arpcom *)ifp; */ 235 236 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 237 (IFF_UP|IFF_RUNNING)) 238 senderr(ENETDOWN); 239 } 240 #endif /* NCARP > 0 */ 241 242 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 243 senderr(ENETDOWN); 244 245 switch (dst->sa_family) { 246 247 #ifdef INET 248 case AF_INET: 249 #ifndef NET_MPSAFE 250 KERNEL_LOCK(1, NULL); 251 #endif 252 if (m->m_flags & M_BCAST) 253 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 254 else if (m->m_flags & M_MCAST) 255 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 256 else if ((error = arpresolve(ifp, rt, m, dst, edst, 257 sizeof(edst))) != 0) { 258 #ifndef NET_MPSAFE 259 KERNEL_UNLOCK_ONE(NULL); 260 #endif 261 return error == EWOULDBLOCK ? 0 : error; 262 } 263 #ifndef NET_MPSAFE 264 KERNEL_UNLOCK_ONE(NULL); 265 #endif 266 /* If broadcasting on a simplex interface, loopback a copy */ 267 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 268 mcopy = m_copy(m, 0, (int)M_COPYALL); 269 etype = htons(ETHERTYPE_IP); 270 break; 271 272 case AF_ARP: 273 ah = mtod(m, struct arphdr *); 274 if (m->m_flags & M_BCAST) 275 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 276 else { 277 void *tha = ar_tha(ah); 278 279 if (tha == NULL) { 280 /* fake with ARPHDR_IEEE1394 */ 281 m_freem(m); 282 return 0; 283 } 284 memcpy(edst, tha, sizeof(edst)); 285 } 286 287 ah->ar_hrd = htons(ARPHRD_ETHER); 288 289 switch (ntohs(ah->ar_op)) { 290 case ARPOP_REVREQUEST: 291 case ARPOP_REVREPLY: 292 etype = htons(ETHERTYPE_REVARP); 293 break; 294 295 case ARPOP_REQUEST: 296 case ARPOP_REPLY: 297 default: 298 etype = htons(ETHERTYPE_ARP); 299 } 300 301 break; 302 #endif 303 #ifdef INET6 304 case AF_INET6: 305 if (m->m_flags & M_BCAST) 306 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 307 else if (m->m_flags & M_MCAST) { 308 ETHER_MAP_IPV6_MULTICAST(&satocsin6(dst)->sin6_addr, 309 edst); 310 } else { 311 error = nd6_resolve(ifp, rt, m, dst, edst, 312 sizeof(edst)); 313 if (error != 0) 314 return error == EWOULDBLOCK ? 0 : error; 315 } 316 etype = htons(ETHERTYPE_IPV6); 317 break; 318 #endif 319 #ifdef NETATALK 320 case AF_APPLETALK: { 321 struct ifaddr *ifa; 322 int s; 323 324 KERNEL_LOCK(1, NULL); 325 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 326 #ifdef NETATALKDEBUG 327 printf("aarpresolv failed\n"); 328 #endif /* NETATALKDEBUG */ 329 KERNEL_UNLOCK_ONE(NULL); 330 return (0); 331 } 332 /* 333 * ifaddr is the first thing in at_ifaddr 334 */ 335 s = pserialize_read_enter(); 336 ifa = at_ifawithnet((const struct sockaddr_at *)dst, ifp); 337 if (ifa == NULL) { 338 pserialize_read_exit(s); 339 KERNEL_UNLOCK_ONE(NULL); 340 goto bad; 341 } 342 aa = (struct at_ifaddr *)ifa; 343 344 /* 345 * In the phase 2 case, we need to prepend an mbuf for the 346 * llc header. Since we must preserve the value of m, 347 * which is passed to us by value, we m_copy() the first 348 * mbuf, and use it for our llc header. 349 */ 350 if (aa->aa_flags & AFA_PHASE2) { 351 struct llc llc; 352 353 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 354 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 355 llc.llc_control = LLC_UI; 356 memcpy(llc.llc_snap_org_code, at_org_code, 357 sizeof(llc.llc_snap_org_code)); 358 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 359 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 360 } else { 361 etype = htons(ETHERTYPE_ATALK); 362 } 363 pserialize_read_exit(s); 364 KERNEL_UNLOCK_ONE(NULL); 365 break; 366 } 367 #endif /* NETATALK */ 368 case pseudo_AF_HDRCMPLT: 369 hdrcmplt = 1; 370 memcpy(esrc, 371 ((const struct ether_header *)dst->sa_data)->ether_shost, 372 sizeof(esrc)); 373 /* FALLTHROUGH */ 374 375 case AF_UNSPEC: 376 memcpy(edst, 377 ((const struct ether_header *)dst->sa_data)->ether_dhost, 378 sizeof(edst)); 379 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 380 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 381 break; 382 383 default: 384 printf("%s: can't handle af%d\n", ifp->if_xname, 385 dst->sa_family); 386 senderr(EAFNOSUPPORT); 387 } 388 389 #ifdef MPLS 390 KERNEL_LOCK(1, NULL); 391 { 392 struct m_tag *mtag; 393 mtag = m_tag_find(m, PACKET_TAG_MPLS, NULL); 394 if (mtag != NULL) { 395 /* Having the tag itself indicates it's MPLS */ 396 etype = htons(ETHERTYPE_MPLS); 397 m_tag_delete(m, mtag); 398 } 399 } 400 KERNEL_UNLOCK_ONE(NULL); 401 #endif 402 403 if (mcopy) 404 (void)looutput(ifp, mcopy, dst, rt); 405 406 /* If no ether type is set, this must be a 802.2 formatted packet. 407 */ 408 if (etype == 0) 409 etype = htons(m->m_pkthdr.len); 410 /* 411 * Add local net header. If no space in first mbuf, 412 * allocate another. 413 */ 414 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 415 if (m == 0) 416 senderr(ENOBUFS); 417 eh = mtod(m, struct ether_header *); 418 /* Note: etype is already in network byte order. */ 419 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 420 memcpy(eh->ether_dhost, edst, sizeof(edst)); 421 if (hdrcmplt) 422 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 423 else 424 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 425 sizeof(eh->ether_shost)); 426 427 #if NCARP > 0 428 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 429 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 430 sizeof(eh->ether_shost)); 431 } 432 #endif /* NCARP > 0 */ 433 434 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 435 return (error); 436 if (m == NULL) 437 return (0); 438 439 #if NBRIDGE > 0 440 /* 441 * Bridges require special output handling. 442 */ 443 if (ifp->if_bridge) 444 return (bridge_output(ifp, m, NULL, NULL)); 445 #endif 446 447 #if NCARP > 0 448 if (ifp != ifp0) 449 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 450 #endif /* NCARP > 0 */ 451 452 #ifdef ALTQ 453 KERNEL_LOCK(1, NULL); 454 /* 455 * If ALTQ is enabled on the parent interface, do 456 * classification; the queueing discipline might not 457 * require classification, but might require the 458 * address family/header pointer in the pktattr. 459 */ 460 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 461 altq_etherclassify(&ifp->if_snd, m); 462 KERNEL_UNLOCK_ONE(NULL); 463 #endif 464 return ifq_enqueue(ifp, m); 465 466 bad: 467 if (m) 468 m_freem(m); 469 return (error); 470 } 471 472 #ifdef ALTQ 473 /* 474 * This routine is a slight hack to allow a packet to be classified 475 * if the Ethernet headers are present. It will go away when ALTQ's 476 * classification engine understands link headers. 477 */ 478 void 479 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m) 480 { 481 struct ether_header *eh; 482 uint16_t ether_type; 483 int hlen, af, hdrsize; 484 void *hdr; 485 486 hlen = ETHER_HDR_LEN; 487 eh = mtod(m, struct ether_header *); 488 489 ether_type = htons(eh->ether_type); 490 491 if (ether_type < ETHERMTU) { 492 /* LLC/SNAP */ 493 struct llc *llc = (struct llc *)(eh + 1); 494 hlen += 8; 495 496 if (m->m_len < hlen || 497 llc->llc_dsap != LLC_SNAP_LSAP || 498 llc->llc_ssap != LLC_SNAP_LSAP || 499 llc->llc_control != LLC_UI) { 500 /* Not SNAP. */ 501 goto bad; 502 } 503 504 ether_type = htons(llc->llc_un.type_snap.ether_type); 505 } 506 507 switch (ether_type) { 508 case ETHERTYPE_IP: 509 af = AF_INET; 510 hdrsize = 20; /* sizeof(struct ip) */ 511 break; 512 513 case ETHERTYPE_IPV6: 514 af = AF_INET6; 515 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 516 break; 517 518 default: 519 af = AF_UNSPEC; 520 hdrsize = 0; 521 break; 522 } 523 524 while (m->m_len <= hlen) { 525 hlen -= m->m_len; 526 m = m->m_next; 527 } 528 if (m->m_len < (hlen + hdrsize)) { 529 /* 530 * protocol header not in a single mbuf. 531 * We can't cope with this situation right 532 * now (but it shouldn't ever happen, really, anyhow). 533 */ 534 #ifdef DEBUG 535 printf("altq_etherclassify: headers span multiple mbufs: " 536 "%d < %d\n", m->m_len, (hlen + hdrsize)); 537 #endif 538 goto bad; 539 } 540 541 m->m_data += hlen; 542 m->m_len -= hlen; 543 544 hdr = mtod(m, void *); 545 546 if (ALTQ_NEEDS_CLASSIFY(ifq)) 547 m->m_pkthdr.pattr_class = 548 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 549 m->m_pkthdr.pattr_af = af; 550 m->m_pkthdr.pattr_hdr = hdr; 551 552 m->m_data -= hlen; 553 m->m_len += hlen; 554 555 return; 556 557 bad: 558 m->m_pkthdr.pattr_class = NULL; 559 m->m_pkthdr.pattr_hdr = NULL; 560 m->m_pkthdr.pattr_af = AF_UNSPEC; 561 } 562 #endif /* ALTQ */ 563 564 /* 565 * Process a received Ethernet packet; 566 * the packet is in the mbuf chain m with 567 * the ether header. 568 */ 569 void 570 ether_input(struct ifnet *ifp, struct mbuf *m) 571 { 572 struct ethercom *ec = (struct ethercom *) ifp; 573 pktqueue_t *pktq = NULL; 574 struct ifqueue *inq = NULL; 575 uint16_t etype; 576 struct ether_header *eh; 577 size_t ehlen; 578 static int earlypkts; 579 int isr = 0; 580 #if defined (LLC) || defined(NETATALK) 581 struct llc *l; 582 #endif 583 584 KASSERT(!cpu_intr_p()); 585 586 if ((ifp->if_flags & IFF_UP) == 0) { 587 m_freem(m); 588 return; 589 } 590 591 #ifdef MBUFTRACE 592 m_claimm(m, &ec->ec_rx_mowner); 593 #endif 594 eh = mtod(m, struct ether_header *); 595 etype = ntohs(eh->ether_type); 596 ehlen = sizeof(*eh); 597 598 if(__predict_false(earlypkts < 100 || !rnd_initial_entropy)) { 599 rnd_add_data(NULL, eh, ehlen, 0); 600 earlypkts++; 601 } 602 603 /* 604 * Determine if the packet is within its size limits. 605 */ 606 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 607 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 608 mutex_enter(&bigpktpps_lock); 609 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 610 bigpktppslim)) { 611 printf("%s: discarding oversize frame (len=%d)\n", 612 ifp->if_xname, m->m_pkthdr.len); 613 } 614 mutex_exit(&bigpktpps_lock); 615 m_freem(m); 616 return; 617 } 618 619 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 620 /* 621 * If this is not a simplex interface, drop the packet 622 * if it came from us. 623 */ 624 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 625 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 626 ETHER_ADDR_LEN) == 0) { 627 m_freem(m); 628 return; 629 } 630 631 if (memcmp(etherbroadcastaddr, 632 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 633 m->m_flags |= M_BCAST; 634 else 635 m->m_flags |= M_MCAST; 636 ifp->if_imcasts++; 637 } 638 639 /* If the CRC is still on the packet, trim it off. */ 640 if (m->m_flags & M_HASFCS) { 641 m_adj(m, -ETHER_CRC_LEN); 642 m->m_flags &= ~M_HASFCS; 643 } 644 645 ifp->if_ibytes += m->m_pkthdr.len; 646 647 #if NCARP > 0 648 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 649 /* 650 * clear M_PROMISC, in case the packets comes from a 651 * vlan 652 */ 653 m->m_flags &= ~M_PROMISC; 654 if (carp_input(m, (uint8_t *)&eh->ether_shost, 655 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 656 return; 657 } 658 #endif /* NCARP > 0 */ 659 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 660 (ifp->if_flags & IFF_PROMISC) != 0 && 661 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 662 ETHER_ADDR_LEN) != 0) { 663 m->m_flags |= M_PROMISC; 664 } 665 666 if ((m->m_flags & M_PROMISC) == 0) { 667 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 668 return; 669 if (m == NULL) 670 return; 671 672 eh = mtod(m, struct ether_header *); 673 etype = ntohs(eh->ether_type); 674 ehlen = sizeof(*eh); 675 } 676 677 #if NAGR > 0 678 if (ifp->if_agrprivate && 679 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 680 m->m_flags &= ~M_PROMISC; 681 agr_input(ifp, m); 682 return; 683 } 684 #endif /* NAGR > 0 */ 685 686 /* 687 * If VLANs are configured on the interface, check to 688 * see if the device performed the decapsulation and 689 * provided us with the tag. 690 */ 691 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 692 #if NVLAN > 0 693 /* 694 * vlan_input() will either recursively call ether_input() 695 * or drop the packet. 696 */ 697 vlan_input(ifp, m); 698 #else 699 m_freem(m); 700 #endif 701 return; 702 } 703 704 /* 705 * Handle protocols that expect to have the Ethernet header 706 * (and possibly FCS) intact. 707 */ 708 switch (etype) { 709 case ETHERTYPE_VLAN: { 710 struct ether_vlan_header *evl = (void *)eh; 711 /* 712 * If there is a tag of 0, then the VLAN header was probably 713 * just being used to store the priority. Extract the ether 714 * type, and if IP or IPV6, let them deal with it. 715 */ 716 if (m->m_len <= sizeof(*evl) 717 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 718 etype = ntohs(evl->evl_proto); 719 ehlen = sizeof(*evl); 720 if ((m->m_flags & M_PROMISC) == 0 721 && (etype == ETHERTYPE_IP 722 || etype == ETHERTYPE_IPV6)) 723 break; 724 } 725 #if NVLAN > 0 726 /* 727 * vlan_input() will either recursively call ether_input() 728 * or drop the packet. 729 */ 730 if (((struct ethercom *)ifp)->ec_nvlans != 0) 731 vlan_input(ifp, m); 732 else 733 #endif /* NVLAN > 0 */ 734 m_freem(m); 735 return; 736 } 737 #if NPPPOE > 0 738 case ETHERTYPE_PPPOEDISC: 739 pppoedisc_input(ifp, m); 740 return; 741 case ETHERTYPE_PPPOE: 742 pppoe_input(ifp, m); 743 return; 744 #endif /* NPPPOE > 0 */ 745 case ETHERTYPE_SLOWPROTOCOLS: { 746 uint8_t subtype; 747 748 #if defined(DIAGNOSTIC) 749 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 750 panic("ether_input: too short slow protocol packet"); 751 } 752 #endif 753 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 754 switch (subtype) { 755 #if NAGR > 0 756 case SLOWPROTOCOLS_SUBTYPE_LACP: 757 if (ifp->if_agrprivate) { 758 ieee8023ad_lacp_input(ifp, m); 759 return; 760 } 761 break; 762 763 case SLOWPROTOCOLS_SUBTYPE_MARKER: 764 if (ifp->if_agrprivate) { 765 ieee8023ad_marker_input(ifp, m); 766 return; 767 } 768 break; 769 #endif /* NAGR > 0 */ 770 default: 771 if (subtype == 0 || subtype > 10) { 772 /* illegal value */ 773 m_freem(m); 774 return; 775 } 776 /* unknown subtype */ 777 break; 778 } 779 /* FALLTHROUGH */ 780 } 781 default: 782 if (m->m_flags & M_PROMISC) { 783 m_freem(m); 784 return; 785 } 786 } 787 788 /* If the CRC is still on the packet, trim it off. */ 789 if (m->m_flags & M_HASFCS) { 790 m_adj(m, -ETHER_CRC_LEN); 791 m->m_flags &= ~M_HASFCS; 792 } 793 794 if (etype > ETHERMTU + sizeof (struct ether_header)) { 795 /* Strip off the Ethernet header. */ 796 m_adj(m, ehlen); 797 798 switch (etype) { 799 #ifdef INET 800 case ETHERTYPE_IP: 801 #ifdef GATEWAY 802 if (ipflow_fastforward(m)) 803 return; 804 #endif 805 pktq = ip_pktq; 806 break; 807 808 case ETHERTYPE_ARP: 809 isr = NETISR_ARP; 810 inq = &arpintrq; 811 break; 812 813 case ETHERTYPE_REVARP: 814 revarpinput(m); /* XXX queue? */ 815 return; 816 #endif 817 #ifdef INET6 818 case ETHERTYPE_IPV6: 819 if (__predict_false(!in6_present)) { 820 m_freem(m); 821 return; 822 } 823 #ifdef GATEWAY 824 if (ip6flow_fastforward(&m)) 825 return; 826 #endif 827 pktq = ip6_pktq; 828 break; 829 #endif 830 #ifdef NETATALK 831 case ETHERTYPE_ATALK: 832 isr = NETISR_ATALK; 833 inq = &atintrq1; 834 break; 835 case ETHERTYPE_AARP: 836 /* probably this should be done with a NETISR as well */ 837 aarpinput(ifp, m); /* XXX */ 838 return; 839 #endif /* NETATALK */ 840 #ifdef MPLS 841 case ETHERTYPE_MPLS: 842 isr = NETISR_MPLS; 843 inq = &mplsintrq; 844 break; 845 #endif 846 default: 847 m_freem(m); 848 return; 849 } 850 } else { 851 #if defined (LLC) || defined (NETATALK) 852 l = (struct llc *)(eh+1); 853 switch (l->llc_dsap) { 854 #ifdef NETATALK 855 case LLC_SNAP_LSAP: 856 switch (l->llc_control) { 857 case LLC_UI: 858 if (l->llc_ssap != LLC_SNAP_LSAP) { 859 goto dropanyway; 860 } 861 862 if (memcmp(&(l->llc_snap_org_code)[0], 863 at_org_code, sizeof(at_org_code)) == 0 && 864 ntohs(l->llc_snap_ether_type) == 865 ETHERTYPE_ATALK) { 866 inq = &atintrq2; 867 m_adj(m, sizeof(struct ether_header) 868 + sizeof(struct llc)); 869 isr = NETISR_ATALK; 870 break; 871 } 872 873 if (memcmp(&(l->llc_snap_org_code)[0], 874 aarp_org_code, 875 sizeof(aarp_org_code)) == 0 && 876 ntohs(l->llc_snap_ether_type) == 877 ETHERTYPE_AARP) { 878 m_adj( m, sizeof(struct ether_header) 879 + sizeof(struct llc)); 880 aarpinput(ifp, m); /* XXX */ 881 return; 882 } 883 884 default: 885 goto dropanyway; 886 } 887 break; 888 dropanyway: 889 #endif 890 default: 891 m_freem(m); 892 return; 893 } 894 #else /* ISO || LLC || NETATALK*/ 895 m_freem(m); 896 return; 897 #endif /* ISO || LLC || NETATALK*/ 898 } 899 900 if (__predict_true(pktq)) { 901 #ifdef NET_MPSAFE 902 const u_int h = curcpu()->ci_index; 903 #else 904 const uint32_t h = pktq_rps_hash(m); 905 #endif 906 if (__predict_false(!pktq_enqueue(pktq, m, h))) { 907 m_freem(m); 908 } 909 return; 910 } 911 912 if (__predict_false(!inq)) { 913 /* Should not happen. */ 914 m_freem(m); 915 return; 916 } 917 918 IFQ_LOCK(inq); 919 if (IF_QFULL(inq)) { 920 IF_DROP(inq); 921 IFQ_UNLOCK(inq); 922 m_freem(m); 923 } else { 924 IF_ENQUEUE(inq, m); 925 IFQ_UNLOCK(inq); 926 schednetisr(isr); 927 } 928 } 929 930 /* 931 * Convert Ethernet address to printable (loggable) representation. 932 */ 933 char * 934 ether_sprintf(const u_char *ap) 935 { 936 static char etherbuf[3 * ETHER_ADDR_LEN]; 937 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 938 } 939 940 char * 941 ether_snprintf(char *buf, size_t len, const u_char *ap) 942 { 943 char *cp = buf; 944 size_t i; 945 946 for (i = 0; i < len / 3; i++) { 947 *cp++ = hexdigits[*ap >> 4]; 948 *cp++ = hexdigits[*ap++ & 0xf]; 949 *cp++ = ':'; 950 } 951 *--cp = '\0'; 952 return buf; 953 } 954 955 /* 956 * Perform common duties while attaching to interface list 957 */ 958 void 959 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 960 { 961 struct ethercom *ec = (struct ethercom *)ifp; 962 963 ifp->if_extflags |= IFEF_OUTPUT_MPSAFE; 964 ifp->if_type = IFT_ETHER; 965 ifp->if_hdrlen = ETHER_HDR_LEN; 966 ifp->if_dlt = DLT_EN10MB; 967 ifp->if_mtu = ETHERMTU; 968 ifp->if_output = ether_output; 969 ifp->_if_input = ether_input; 970 if (ifp->if_baudrate == 0) 971 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 972 973 if (lla != NULL) 974 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 975 976 LIST_INIT(&ec->ec_multiaddrs); 977 ec->ec_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 978 ifp->if_broadcastaddr = etherbroadcastaddr; 979 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 980 #ifdef MBUFTRACE 981 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 982 sizeof(ec->ec_tx_mowner.mo_name)); 983 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 984 sizeof(ec->ec_tx_mowner.mo_descr)); 985 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 986 sizeof(ec->ec_rx_mowner.mo_name)); 987 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 988 sizeof(ec->ec_rx_mowner.mo_descr)); 989 MOWNER_ATTACH(&ec->ec_tx_mowner); 990 MOWNER_ATTACH(&ec->ec_rx_mowner); 991 ifp->if_mowner = &ec->ec_tx_mowner; 992 #endif 993 } 994 995 void 996 ether_ifdetach(struct ifnet *ifp) 997 { 998 struct ethercom *ec = (void *) ifp; 999 struct ether_multi *enm; 1000 1001 /* 1002 * Prevent further calls to ioctl (for example turning off 1003 * promiscuous mode from the bridge code), which eventually can 1004 * call if_init() which can cause panics because the interface 1005 * is in the process of being detached. Return device not configured 1006 * instead. 1007 */ 1008 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1009 1010 #if NBRIDGE > 0 1011 if (ifp->if_bridge) 1012 bridge_ifdetach(ifp); 1013 #endif 1014 1015 bpf_detach(ifp); 1016 1017 #if NVLAN > 0 1018 if (ec->ec_nvlans) 1019 vlan_ifdetach(ifp); 1020 #endif 1021 1022 mutex_enter(ec->ec_lock); 1023 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1024 LIST_REMOVE(enm, enm_list); 1025 kmem_free(enm, sizeof(*enm)); 1026 ec->ec_multicnt--; 1027 } 1028 mutex_exit(ec->ec_lock); 1029 1030 mutex_destroy(ec->ec_lock); 1031 1032 ifp->if_mowner = NULL; 1033 MOWNER_DETACH(&ec->ec_rx_mowner); 1034 MOWNER_DETACH(&ec->ec_tx_mowner); 1035 } 1036 1037 #if 0 1038 /* 1039 * This is for reference. We have a table-driven version 1040 * of the little-endian crc32 generator, which is faster 1041 * than the double-loop. 1042 */ 1043 uint32_t 1044 ether_crc32_le(const uint8_t *buf, size_t len) 1045 { 1046 uint32_t c, crc, carry; 1047 size_t i, j; 1048 1049 crc = 0xffffffffU; /* initial value */ 1050 1051 for (i = 0; i < len; i++) { 1052 c = buf[i]; 1053 for (j = 0; j < 8; j++) { 1054 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1055 crc >>= 1; 1056 c >>= 1; 1057 if (carry) 1058 crc = (crc ^ ETHER_CRC_POLY_LE); 1059 } 1060 } 1061 1062 return (crc); 1063 } 1064 #else 1065 uint32_t 1066 ether_crc32_le(const uint8_t *buf, size_t len) 1067 { 1068 static const uint32_t crctab[] = { 1069 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1070 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1071 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1072 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1073 }; 1074 uint32_t crc; 1075 size_t i; 1076 1077 crc = 0xffffffffU; /* initial value */ 1078 1079 for (i = 0; i < len; i++) { 1080 crc ^= buf[i]; 1081 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1082 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1083 } 1084 1085 return (crc); 1086 } 1087 #endif 1088 1089 uint32_t 1090 ether_crc32_be(const uint8_t *buf, size_t len) 1091 { 1092 uint32_t c, crc, carry; 1093 size_t i, j; 1094 1095 crc = 0xffffffffU; /* initial value */ 1096 1097 for (i = 0; i < len; i++) { 1098 c = buf[i]; 1099 for (j = 0; j < 8; j++) { 1100 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1101 crc <<= 1; 1102 c >>= 1; 1103 if (carry) 1104 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1105 } 1106 } 1107 1108 return (crc); 1109 } 1110 1111 #ifdef INET 1112 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1113 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1114 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1115 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1116 #endif 1117 #ifdef INET6 1118 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1119 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1120 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1121 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1122 #endif 1123 1124 /* 1125 * ether_aton implementation, not using a static buffer. 1126 */ 1127 int 1128 ether_aton_r(u_char *dest, size_t len, const char *str) 1129 { 1130 const u_char *cp = (const void *)str; 1131 u_char *ep; 1132 1133 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1134 1135 if (len < ETHER_ADDR_LEN) 1136 return ENOSPC; 1137 1138 ep = dest + ETHER_ADDR_LEN; 1139 1140 while (*cp) { 1141 if (!isxdigit(*cp)) 1142 return EINVAL; 1143 *dest = atox(*cp); 1144 cp++; 1145 if (isxdigit(*cp)) { 1146 *dest = (*dest << 4) | atox(*cp); 1147 dest++; 1148 cp++; 1149 } else 1150 dest++; 1151 if (dest == ep) 1152 return *cp == '\0' ? 0 : ENAMETOOLONG; 1153 switch (*cp) { 1154 case ':': 1155 case '-': 1156 case '.': 1157 cp++; 1158 break; 1159 } 1160 } 1161 return ENOBUFS; 1162 } 1163 1164 /* 1165 * Convert a sockaddr into an Ethernet address or range of Ethernet 1166 * addresses. 1167 */ 1168 int 1169 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1170 uint8_t addrhi[ETHER_ADDR_LEN]) 1171 { 1172 #ifdef INET 1173 const struct sockaddr_in *sin; 1174 #endif /* INET */ 1175 #ifdef INET6 1176 const struct sockaddr_in6 *sin6; 1177 #endif /* INET6 */ 1178 1179 switch (sa->sa_family) { 1180 1181 case AF_UNSPEC: 1182 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1183 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1184 break; 1185 1186 #ifdef INET 1187 case AF_INET: 1188 sin = satocsin(sa); 1189 if (sin->sin_addr.s_addr == INADDR_ANY) { 1190 /* 1191 * An IP address of INADDR_ANY means listen to 1192 * or stop listening to all of the Ethernet 1193 * multicast addresses used for IP. 1194 * (This is for the sake of IP multicast routers.) 1195 */ 1196 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1197 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1198 } 1199 else { 1200 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1201 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1202 } 1203 break; 1204 #endif 1205 #ifdef INET6 1206 case AF_INET6: 1207 sin6 = satocsin6(sa); 1208 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1209 /* 1210 * An IP6 address of 0 means listen to or stop 1211 * listening to all of the Ethernet multicast 1212 * address used for IP6. 1213 * (This is used for multicast routers.) 1214 */ 1215 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1216 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1217 } else { 1218 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1219 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1220 } 1221 break; 1222 #endif 1223 1224 default: 1225 return EAFNOSUPPORT; 1226 } 1227 return 0; 1228 } 1229 1230 /* 1231 * Add an Ethernet multicast address or range of addresses to the list for a 1232 * given interface. 1233 */ 1234 int 1235 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1236 { 1237 struct ether_multi *enm, *_enm; 1238 u_char addrlo[ETHER_ADDR_LEN]; 1239 u_char addrhi[ETHER_ADDR_LEN]; 1240 int error = 0; 1241 1242 /* Allocate out of lock */ 1243 /* XXX still can be called in softint */ 1244 enm = kmem_intr_alloc(sizeof(*enm), KM_SLEEP); 1245 if (enm == NULL) 1246 return ENOBUFS; 1247 1248 mutex_enter(ec->ec_lock); 1249 error = ether_multiaddr(sa, addrlo, addrhi); 1250 if (error != 0) 1251 goto out; 1252 1253 /* 1254 * Verify that we have valid Ethernet multicast addresses. 1255 */ 1256 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1257 error = EINVAL; 1258 goto out; 1259 } 1260 /* 1261 * See if the address range is already in the list. 1262 */ 1263 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, _enm); 1264 if (_enm != NULL) { 1265 /* 1266 * Found it; just increment the reference count. 1267 */ 1268 ++_enm->enm_refcount; 1269 error = 0; 1270 goto out; 1271 } 1272 /* 1273 * Link a new multicast record into the interface's multicast list. 1274 */ 1275 memcpy(enm->enm_addrlo, addrlo, 6); 1276 memcpy(enm->enm_addrhi, addrhi, 6); 1277 enm->enm_refcount = 1; 1278 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1279 ec->ec_multicnt++; 1280 /* 1281 * Return ENETRESET to inform the driver that the list has changed 1282 * and its reception filter should be adjusted accordingly. 1283 */ 1284 error = ENETRESET; 1285 enm = NULL; 1286 out: 1287 mutex_exit(ec->ec_lock); 1288 if (enm != NULL) 1289 kmem_free(enm, sizeof(*enm)); 1290 return error; 1291 } 1292 1293 /* 1294 * Delete a multicast address record. 1295 */ 1296 int 1297 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1298 { 1299 struct ether_multi *enm; 1300 u_char addrlo[ETHER_ADDR_LEN]; 1301 u_char addrhi[ETHER_ADDR_LEN]; 1302 int error; 1303 1304 mutex_enter(ec->ec_lock); 1305 error = ether_multiaddr(sa, addrlo, addrhi); 1306 if (error != 0) 1307 goto error; 1308 1309 /* 1310 * Look ur the address in our list. 1311 */ 1312 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1313 if (enm == NULL) { 1314 error = ENXIO; 1315 goto error; 1316 } 1317 if (--enm->enm_refcount != 0) { 1318 /* 1319 * Still some claims to this record. 1320 */ 1321 error = 0; 1322 goto error; 1323 } 1324 /* 1325 * No remaining claims to this record; unlink and free it. 1326 */ 1327 LIST_REMOVE(enm, enm_list); 1328 ec->ec_multicnt--; 1329 mutex_exit(ec->ec_lock); 1330 1331 kmem_free(enm, sizeof(*enm)); 1332 /* 1333 * Return ENETRESET to inform the driver that the list has changed 1334 * and its reception filter should be adjusted accordingly. 1335 */ 1336 return ENETRESET; 1337 error: 1338 mutex_exit(ec->ec_lock); 1339 return error; 1340 } 1341 1342 void 1343 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1344 { 1345 ec->ec_ifflags_cb = cb; 1346 } 1347 1348 /* 1349 * Common ioctls for Ethernet interfaces. Note, we must be 1350 * called at splnet(). 1351 */ 1352 int 1353 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1354 { 1355 struct ethercom *ec = (void *) ifp; 1356 struct eccapreq *eccr; 1357 struct ifreq *ifr = (struct ifreq *)data; 1358 struct if_laddrreq *iflr = data; 1359 const struct sockaddr_dl *sdl; 1360 static const uint8_t zero[ETHER_ADDR_LEN]; 1361 int error; 1362 1363 switch (cmd) { 1364 case SIOCINITIFADDR: 1365 { 1366 struct ifaddr *ifa = (struct ifaddr *)data; 1367 if (ifa->ifa_addr->sa_family != AF_LINK 1368 && (ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1369 (IFF_UP|IFF_RUNNING)) { 1370 ifp->if_flags |= IFF_UP; 1371 if ((error = (*ifp->if_init)(ifp)) != 0) 1372 return error; 1373 } 1374 #ifdef INET 1375 if (ifa->ifa_addr->sa_family == AF_INET) 1376 arp_ifinit(ifp, ifa); 1377 #endif /* INET */ 1378 return 0; 1379 } 1380 1381 case SIOCSIFMTU: 1382 { 1383 int maxmtu; 1384 1385 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1386 maxmtu = ETHERMTU_JUMBO; 1387 else 1388 maxmtu = ETHERMTU; 1389 1390 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1391 return EINVAL; 1392 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1393 return error; 1394 else if (ifp->if_flags & IFF_UP) { 1395 /* Make sure the device notices the MTU change. */ 1396 return (*ifp->if_init)(ifp); 1397 } else 1398 return 0; 1399 } 1400 1401 case SIOCSIFFLAGS: 1402 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1403 return error; 1404 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1405 case IFF_RUNNING: 1406 /* 1407 * If interface is marked down and it is running, 1408 * then stop and disable it. 1409 */ 1410 (*ifp->if_stop)(ifp, 1); 1411 break; 1412 case IFF_UP: 1413 /* 1414 * If interface is marked up and it is stopped, then 1415 * start it. 1416 */ 1417 return (*ifp->if_init)(ifp); 1418 case IFF_UP|IFF_RUNNING: 1419 error = 0; 1420 if (ec->ec_ifflags_cb == NULL || 1421 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1422 /* 1423 * Reset the interface to pick up 1424 * changes in any other flags that 1425 * affect the hardware state. 1426 */ 1427 return (*ifp->if_init)(ifp); 1428 } else 1429 return error; 1430 case 0: 1431 break; 1432 } 1433 return 0; 1434 case SIOCGETHERCAP: 1435 eccr = (struct eccapreq *)data; 1436 eccr->eccr_capabilities = ec->ec_capabilities; 1437 eccr->eccr_capenable = ec->ec_capenable; 1438 return 0; 1439 case SIOCADDMULTI: 1440 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1441 case SIOCDELMULTI: 1442 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1443 case SIOCSIFMEDIA: 1444 case SIOCGIFMEDIA: 1445 if (ec->ec_mii == NULL) 1446 return ENOTTY; 1447 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1448 case SIOCALIFADDR: 1449 sdl = satocsdl(sstocsa(&iflr->addr)); 1450 if (sdl->sdl_family != AF_LINK) 1451 ; 1452 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1453 return EINVAL; 1454 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1455 return EINVAL; 1456 /*FALLTHROUGH*/ 1457 default: 1458 return ifioctl_common(ifp, cmd, data); 1459 } 1460 return 0; 1461 } 1462 1463 /* 1464 * Enable/disable passing VLAN packets if the parent interface supports it. 1465 * Return: 1466 * 0: Ok 1467 * -1: Parent interface does not support vlans 1468 * >0: Error 1469 */ 1470 int 1471 ether_enable_vlan_mtu(struct ifnet *ifp) 1472 { 1473 int error; 1474 struct ethercom *ec = (void *)ifp; 1475 1476 /* Parent does not support VLAN's */ 1477 if ((ec->ec_capabilities & ETHERCAP_VLAN_MTU) == 0) 1478 return -1; 1479 1480 /* 1481 * Parent supports the VLAN_MTU capability, 1482 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames; 1483 * enable it. 1484 */ 1485 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1486 1487 /* Interface is down, defer for later */ 1488 if ((ifp->if_flags & IFF_UP) == 0) 1489 return 0; 1490 1491 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1492 return 0; 1493 1494 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1495 return error; 1496 } 1497 1498 int 1499 ether_disable_vlan_mtu(struct ifnet *ifp) 1500 { 1501 int error; 1502 struct ethercom *ec = (void *)ifp; 1503 1504 /* We still have VLAN's, defer for later */ 1505 if (ec->ec_nvlans != 0) 1506 return 0; 1507 1508 /* Parent does not support VLAB's, nothing to do. */ 1509 if ((ec->ec_capenable & ETHERCAP_VLAN_MTU) == 0) 1510 return -1; 1511 1512 /* 1513 * Disable Tx/Rx of VLAN-sized frames. 1514 */ 1515 ec->ec_capenable &= ~ETHERCAP_VLAN_MTU; 1516 1517 /* Interface is down, defer for later */ 1518 if ((ifp->if_flags & IFF_UP) == 0) 1519 return 0; 1520 1521 if ((error = if_flags_set(ifp, ifp->if_flags)) == 0) 1522 return 0; 1523 1524 ec->ec_capenable |= ETHERCAP_VLAN_MTU; 1525 return error; 1526 } 1527 1528 static int 1529 ether_multicast_sysctl(SYSCTLFN_ARGS) 1530 { 1531 struct ether_multi *enm; 1532 struct ifnet *ifp; 1533 struct ethercom *ec; 1534 int error = 0; 1535 size_t written; 1536 struct psref psref; 1537 int bound; 1538 unsigned int multicnt; 1539 struct ether_multi_sysctl *addrs; 1540 int i; 1541 1542 if (namelen != 1) 1543 return EINVAL; 1544 1545 bound = curlwp_bind(); 1546 ifp = if_get_byindex(name[0], &psref); 1547 if (ifp == NULL) { 1548 error = ENODEV; 1549 goto out; 1550 } 1551 if (ifp->if_type != IFT_ETHER) { 1552 if_put(ifp, &psref); 1553 *oldlenp = 0; 1554 goto out; 1555 } 1556 ec = (struct ethercom *)ifp; 1557 1558 if (oldp == NULL) { 1559 if_put(ifp, &psref); 1560 *oldlenp = ec->ec_multicnt * sizeof(*addrs); 1561 goto out; 1562 } 1563 1564 /* 1565 * ec->ec_lock is a spin mutex so we cannot call sysctl_copyout, which 1566 * is sleepable, with holding it. Copy data to a local buffer first 1567 * with holding it and then call sysctl_copyout without holding it. 1568 */ 1569 retry: 1570 multicnt = ec->ec_multicnt; 1571 addrs = kmem_alloc(sizeof(*addrs) * multicnt, KM_SLEEP); 1572 1573 mutex_enter(ec->ec_lock); 1574 if (multicnt < ec->ec_multicnt) { 1575 /* The number of multicast addresses have increased */ 1576 mutex_exit(ec->ec_lock); 1577 kmem_free(addrs, sizeof(*addrs) * multicnt); 1578 goto retry; 1579 } 1580 1581 i = 0; 1582 LIST_FOREACH(enm, &ec->ec_multiaddrs, enm_list) { 1583 struct ether_multi_sysctl *addr = &addrs[i]; 1584 addr->enm_refcount = enm->enm_refcount; 1585 memcpy(addr->enm_addrlo, enm->enm_addrlo, ETHER_ADDR_LEN); 1586 memcpy(addr->enm_addrhi, enm->enm_addrhi, ETHER_ADDR_LEN); 1587 i++; 1588 } 1589 mutex_exit(ec->ec_lock); 1590 1591 error = 0; 1592 written = 0; 1593 for (i = 0; i < multicnt; i++) { 1594 struct ether_multi_sysctl *addr = &addrs[i]; 1595 1596 if (written + sizeof(*addr) > *oldlenp) 1597 break; 1598 error = sysctl_copyout(l, addr, oldp, sizeof(*addr)); 1599 if (error) 1600 break; 1601 written += sizeof(*addr); 1602 oldp = (char *)oldp + sizeof(*addr); 1603 } 1604 kmem_free(addrs, sizeof(*addrs) * multicnt); 1605 1606 if_put(ifp, &psref); 1607 1608 *oldlenp = written; 1609 out: 1610 curlwp_bindx(bound); 1611 return error; 1612 } 1613 1614 static void 1615 ether_sysctl_setup(struct sysctllog **clog) 1616 { 1617 const struct sysctlnode *rnode = NULL; 1618 1619 sysctl_createv(clog, 0, NULL, &rnode, 1620 CTLFLAG_PERMANENT, 1621 CTLTYPE_NODE, "ether", 1622 SYSCTL_DESCR("Ethernet-specific information"), 1623 NULL, 0, NULL, 0, 1624 CTL_NET, CTL_CREATE, CTL_EOL); 1625 1626 sysctl_createv(clog, 0, &rnode, NULL, 1627 CTLFLAG_PERMANENT, 1628 CTLTYPE_NODE, "multicast", 1629 SYSCTL_DESCR("multicast addresses"), 1630 ether_multicast_sysctl, 0, NULL, 0, 1631 CTL_CREATE, CTL_EOL); 1632 } 1633 1634 void 1635 etherinit(void) 1636 { 1637 1638 mutex_init(&bigpktpps_lock, MUTEX_DEFAULT, IPL_NET); 1639 ether_sysctl_setup(NULL); 1640 } 1641
Indexes created Wed Sep 24 15:09:51 GMT 2025