1 /* 2 * Copyright (c) 1982, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 34 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $ 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipx.h" 40 #include "opt_mpls.h" 41 #include "opt_netgraph.h" 42 #include "opt_carp.h" 43 #include "opt_rss.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/globaldata.h> 48 #include <sys/kernel.h> 49 #include <sys/ktr.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/msgport.h> 54 #include <sys/socket.h> 55 #include <sys/sockio.h> 56 #include <sys/sysctl.h> 57 #include <sys/thread.h> 58 59 #include <sys/thread2.h> 60 #include <sys/mplock2.h> 61 62 #include <net/if.h> 63 #include <net/netisr.h> 64 #include <net/route.h> 65 #include <net/if_llc.h> 66 #include <net/if_dl.h> 67 #include <net/if_types.h> 68 #include <net/ifq_var.h> 69 #include <net/bpf.h> 70 #include <net/ethernet.h> 71 #include <net/vlan/if_vlan_ether.h> 72 #include <net/netmsg2.h> 73 74 #if defined(INET) || defined(INET6) 75 #include <netinet/in.h> 76 #include <netinet/ip_var.h> 77 #include <netinet/if_ether.h> 78 #include <netinet/ip_flow.h> 79 #include <net/ipfw/ip_fw.h> 80 #include <net/dummynet/ip_dummynet.h> 81 #endif 82 #ifdef INET6 83 #include <netinet6/nd6.h> 84 #endif 85 86 #ifdef CARP 87 #include <netinet/ip_carp.h> 88 #endif 89 90 #ifdef IPX 91 #include <netproto/ipx/ipx.h> 92 #include <netproto/ipx/ipx_if.h> 93 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m); 94 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 95 short *tp, int *hlen); 96 #endif 97 98 #ifdef MPLS 99 #include <netproto/mpls/mpls.h> 100 #endif 101 102 /* netgraph node hooks for ng_ether(4) */ 103 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 104 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 105 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 106 void (*ng_ether_attach_p)(struct ifnet *ifp); 107 void (*ng_ether_detach_p)(struct ifnet *ifp); 108 109 void (*vlan_input_p)(struct mbuf *); 110 111 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 112 struct rtentry *); 113 static void ether_restore_header(struct mbuf **, const struct ether_header *, 114 const struct ether_header *); 115 static int ether_characterize(struct mbuf **); 116 117 /* 118 * if_bridge support 119 */ 120 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 121 int (*bridge_output_p)(struct ifnet *, struct mbuf *); 122 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 123 struct ifnet *(*bridge_interface_p)(void *if_bridge); 124 125 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 126 struct sockaddr *); 127 128 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 129 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 130 }; 131 132 #define gotoerr(e) do { error = (e); goto bad; } while (0) 133 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 134 135 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 136 struct ip_fw **rule, 137 const struct ether_header *eh); 138 139 static int ether_ipfw; 140 static u_long ether_restore_hdr; 141 static u_long ether_prepend_hdr; 142 static u_long ether_input_wronghash; 143 static int ether_debug; 144 145 #ifdef RSS_DEBUG 146 static u_long ether_pktinfo_try; 147 static u_long ether_pktinfo_hit; 148 static u_long ether_rss_nopi; 149 static u_long ether_rss_nohash; 150 static u_long ether_input_requeue; 151 #endif 152 153 SYSCTL_DECL(_net_link); 154 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 155 SYSCTL_INT(_net_link_ether, OID_AUTO, debug, CTLFLAG_RW, 156 ðer_debug, 0, "Ether debug"); 157 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 158 ðer_ipfw, 0, "Pass ether pkts through firewall"); 159 SYSCTL_ULONG(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW, 160 ðer_restore_hdr, 0, "# of ether header restoration"); 161 SYSCTL_ULONG(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW, 162 ðer_prepend_hdr, 0, 163 "# of ether header restoration which prepends mbuf"); 164 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghash, CTLFLAG_RW, 165 ðer_input_wronghash, 0, "# of input packets with wrong hash"); 166 #ifdef RSS_DEBUG 167 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nopi, CTLFLAG_RW, 168 ðer_rss_nopi, 0, "# of packets do not have pktinfo"); 169 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nohash, CTLFLAG_RW, 170 ðer_rss_nohash, 0, "# of packets do not have hash"); 171 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_try, CTLFLAG_RW, 172 ðer_pktinfo_try, 0, 173 "# of tries to find packets' msgport using pktinfo"); 174 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_hit, CTLFLAG_RW, 175 ðer_pktinfo_hit, 0, 176 "# of packets whose msgport are found using pktinfo"); 177 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_requeue, CTLFLAG_RW, 178 ðer_input_requeue, 0, "# of input packets gets requeued"); 179 #endif 180 181 #define ETHER_KTR_STR "ifp=%p" 182 #define ETHER_KTR_ARGS struct ifnet *ifp 183 #ifndef KTR_ETHERNET 184 #define KTR_ETHERNET KTR_ALL 185 #endif 186 KTR_INFO_MASTER(ether); 187 KTR_INFO(KTR_ETHERNET, ether, chain_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARGS); 188 KTR_INFO(KTR_ETHERNET, ether, chain_end, 1, ETHER_KTR_STR, ETHER_KTR_ARGS); 189 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARGS); 190 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARGS); 191 #define logether(name, arg) KTR_LOG(ether_ ## name, arg) 192 193 /* 194 * Ethernet output routine. 195 * Encapsulate a packet of type family for the local net. 196 * Use trailer local net encapsulation if enough data in first 197 * packet leaves a multiple of 512 bytes of data in remainder. 198 * Assumes that ifp is actually pointer to arpcom structure. 199 */ 200 static int 201 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 202 struct rtentry *rt) 203 { 204 struct ether_header *eh, *deh; 205 u_char *edst; 206 int loop_copy = 0; 207 int hlen = ETHER_HDR_LEN; /* link layer header length */ 208 struct arpcom *ac = IFP2AC(ifp); 209 int error; 210 211 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 212 213 if (ifp->if_flags & IFF_MONITOR) 214 gotoerr(ENETDOWN); 215 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 216 gotoerr(ENETDOWN); 217 218 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 219 if (m == NULL) 220 return (ENOBUFS); 221 eh = mtod(m, struct ether_header *); 222 edst = eh->ether_dhost; 223 224 /* 225 * Fill in the destination ethernet address and frame type. 226 */ 227 switch (dst->sa_family) { 228 #ifdef INET 229 case AF_INET: 230 if (!arpresolve(ifp, rt, m, dst, edst)) 231 return (0); /* if not yet resolved */ 232 #ifdef MPLS 233 if (m->m_flags & M_MPLSLABELED) 234 eh->ether_type = htons(ETHERTYPE_MPLS); 235 else 236 #endif 237 eh->ether_type = htons(ETHERTYPE_IP); 238 break; 239 #endif 240 #ifdef INET6 241 case AF_INET6: 242 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 243 return (0); /* Something bad happenned. */ 244 eh->ether_type = htons(ETHERTYPE_IPV6); 245 break; 246 #endif 247 #ifdef IPX 248 case AF_IPX: 249 if (ef_outputp != NULL) { 250 /* 251 * Hold BGL and recheck ef_outputp 252 */ 253 get_mplock(); 254 if (ef_outputp != NULL) { 255 error = ef_outputp(ifp, &m, dst, 256 &eh->ether_type, &hlen); 257 rel_mplock(); 258 if (error) 259 goto bad; 260 else 261 break; 262 } 263 rel_mplock(); 264 } 265 eh->ether_type = htons(ETHERTYPE_IPX); 266 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 267 edst, ETHER_ADDR_LEN); 268 break; 269 #endif 270 case pseudo_AF_HDRCMPLT: 271 case AF_UNSPEC: 272 loop_copy = -1; /* if this is for us, don't do it */ 273 deh = (struct ether_header *)dst->sa_data; 274 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 275 eh->ether_type = deh->ether_type; 276 break; 277 278 default: 279 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 280 gotoerr(EAFNOSUPPORT); 281 } 282 283 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 284 memcpy(eh->ether_shost, 285 ((struct ether_header *)dst->sa_data)->ether_shost, 286 ETHER_ADDR_LEN); 287 else 288 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 289 290 /* 291 * Bridges require special output handling. 292 */ 293 if (ifp->if_bridge) { 294 KASSERT(bridge_output_p != NULL, 295 ("%s: if_bridge not loaded!", __func__)); 296 return bridge_output_p(ifp, m); 297 } 298 299 /* 300 * If a simplex interface, and the packet is being sent to our 301 * Ethernet address or a broadcast address, loopback a copy. 302 * XXX To make a simplex device behave exactly like a duplex 303 * device, we should copy in the case of sending to our own 304 * ethernet address (thus letting the original actually appear 305 * on the wire). However, we don't do that here for security 306 * reasons and compatibility with the original behavior. 307 */ 308 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 309 int csum_flags = 0; 310 311 if (m->m_pkthdr.csum_flags & CSUM_IP) 312 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 313 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 314 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 315 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 316 struct mbuf *n; 317 318 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 319 n->m_pkthdr.csum_flags |= csum_flags; 320 if (csum_flags & CSUM_DATA_VALID) 321 n->m_pkthdr.csum_data = 0xffff; 322 if_simloop(ifp, n, dst->sa_family, hlen); 323 } else 324 ifp->if_iqdrops++; 325 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 326 ETHER_ADDR_LEN) == 0) { 327 m->m_pkthdr.csum_flags |= csum_flags; 328 if (csum_flags & CSUM_DATA_VALID) 329 m->m_pkthdr.csum_data = 0xffff; 330 if_simloop(ifp, m, dst->sa_family, hlen); 331 return (0); /* XXX */ 332 } 333 } 334 335 #ifdef CARP 336 if (ifp->if_carp) { 337 /* 338 * Hold BGL and recheck ifp->if_carp 339 */ 340 get_mplock(); 341 if (ifp->if_carp && (error = carp_output(ifp, m, dst, NULL))) { 342 rel_mplock(); 343 goto bad; 344 } 345 rel_mplock(); 346 } 347 #endif 348 349 350 /* Handle ng_ether(4) processing, if any */ 351 if (ng_ether_output_p != NULL) { 352 /* 353 * Hold BGL and recheck ng_ether_output_p 354 */ 355 get_mplock(); 356 if (ng_ether_output_p != NULL) { 357 if ((error = ng_ether_output_p(ifp, &m)) != 0) { 358 rel_mplock(); 359 goto bad; 360 } 361 if (m == NULL) { 362 rel_mplock(); 363 return (0); 364 } 365 } 366 rel_mplock(); 367 } 368 369 /* Continue with link-layer output */ 370 return ether_output_frame(ifp, m); 371 372 bad: 373 m_freem(m); 374 return (error); 375 } 376 377 /* 378 * Returns the bridge interface an ifp is associated 379 * with. 380 * 381 * Only call if ifp->if_bridge != NULL. 382 */ 383 struct ifnet * 384 ether_bridge_interface(struct ifnet *ifp) 385 { 386 if (bridge_interface_p) 387 return(bridge_interface_p(ifp->if_bridge)); 388 return (ifp); 389 } 390 391 /* 392 * Ethernet link layer output routine to send a raw frame to the device. 393 * 394 * This assumes that the 14 byte Ethernet header is present and contiguous 395 * in the first mbuf. 396 */ 397 int 398 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 399 { 400 struct ip_fw *rule = NULL; 401 int error = 0; 402 struct altq_pktattr pktattr; 403 404 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 405 406 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 407 struct m_tag *mtag; 408 409 /* Extract info from dummynet tag */ 410 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 411 KKASSERT(mtag != NULL); 412 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 413 KKASSERT(rule != NULL); 414 415 m_tag_delete(m, mtag); 416 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 417 } 418 419 if (ifq_is_enabled(&ifp->if_snd)) 420 altq_etherclassify(&ifp->if_snd, m, &pktattr); 421 crit_enter(); 422 if (IPFW_LOADED && ether_ipfw != 0) { 423 struct ether_header save_eh, *eh; 424 425 eh = mtod(m, struct ether_header *); 426 save_eh = *eh; 427 m_adj(m, ETHER_HDR_LEN); 428 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 429 crit_exit(); 430 if (m != NULL) { 431 m_freem(m); 432 return ENOBUFS; /* pkt dropped */ 433 } else 434 return 0; /* consumed e.g. in a pipe */ 435 } 436 437 /* packet was ok, restore the ethernet header */ 438 ether_restore_header(&m, eh, &save_eh); 439 if (m == NULL) { 440 crit_exit(); 441 return ENOBUFS; 442 } 443 } 444 crit_exit(); 445 446 /* 447 * Queue message on interface, update output statistics if 448 * successful, and start output if interface not yet active. 449 */ 450 error = ifq_dispatch(ifp, m, &pktattr); 451 return (error); 452 } 453 454 /* 455 * ipfw processing for ethernet packets (in and out). 456 * The second parameter is NULL from ether_demux(), and ifp from 457 * ether_output_frame(). 458 */ 459 static boolean_t 460 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 461 const struct ether_header *eh) 462 { 463 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */ 464 struct ip_fw_args args; 465 struct m_tag *mtag; 466 struct mbuf *m; 467 int i; 468 469 if (*rule != NULL && fw_one_pass) 470 return TRUE; /* dummynet packet, already partially processed */ 471 472 /* 473 * I need some amount of data to be contiguous. 474 */ 475 i = min((*m0)->m_pkthdr.len, max_protohdr); 476 if ((*m0)->m_len < i) { 477 *m0 = m_pullup(*m0, i); 478 if (*m0 == NULL) 479 return FALSE; 480 } 481 482 /* 483 * Clean up tags 484 */ 485 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 486 m_tag_delete(*m0, mtag); 487 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 488 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 489 KKASSERT(mtag != NULL); 490 m_tag_delete(*m0, mtag); 491 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 492 } 493 494 args.m = *m0; /* the packet we are looking at */ 495 args.oif = dst; /* destination, if any */ 496 args.rule = *rule; /* matching rule to restart */ 497 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 498 i = ip_fw_chk_ptr(&args); 499 *m0 = args.m; 500 *rule = args.rule; 501 502 if (*m0 == NULL) 503 return FALSE; 504 505 switch (i) { 506 case IP_FW_PASS: 507 return TRUE; 508 509 case IP_FW_DIVERT: 510 case IP_FW_TEE: 511 case IP_FW_DENY: 512 /* 513 * XXX at some point add support for divert/forward actions. 514 * If none of the above matches, we have to drop the pkt. 515 */ 516 return FALSE; 517 518 case IP_FW_DUMMYNET: 519 /* 520 * Pass the pkt to dummynet, which consumes it. 521 */ 522 m = *m0; /* pass the original to dummynet */ 523 *m0 = NULL; /* and nothing back to the caller */ 524 525 ether_restore_header(&m, eh, &save_eh); 526 if (m == NULL) 527 return FALSE; 528 529 ip_fw_dn_io_ptr(m, args.cookie, 530 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 531 ip_dn_queue(m); 532 return FALSE; 533 534 default: 535 panic("unknown ipfw return value: %d\n", i); 536 } 537 } 538 539 static void 540 ether_input(struct ifnet *ifp, struct mbuf *m) 541 { 542 ether_input_chain(ifp, m, NULL, NULL); 543 } 544 545 /* 546 * Perform common duties while attaching to interface list 547 */ 548 void 549 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 550 { 551 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 552 serializer); 553 } 554 555 void 556 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 557 lwkt_serialize_t serializer) 558 { 559 struct sockaddr_dl *sdl; 560 561 ifp->if_type = IFT_ETHER; 562 ifp->if_addrlen = ETHER_ADDR_LEN; 563 ifp->if_hdrlen = ETHER_HDR_LEN; 564 if_attach(ifp, serializer); 565 ifp->if_mtu = ETHERMTU; 566 if (ifp->if_baudrate == 0) 567 ifp->if_baudrate = 10000000; 568 ifp->if_output = ether_output; 569 ifp->if_input = ether_input; 570 ifp->if_resolvemulti = ether_resolvemulti; 571 ifp->if_broadcastaddr = etherbroadcastaddr; 572 sdl = IF_LLSOCKADDR(ifp); 573 sdl->sdl_type = IFT_ETHER; 574 sdl->sdl_alen = ifp->if_addrlen; 575 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 576 /* 577 * XXX Keep the current drivers happy. 578 * XXX Remove once all drivers have been cleaned up 579 */ 580 if (lla != IFP2AC(ifp)->ac_enaddr) 581 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 582 bpfattach(ifp, dlt, hdrlen); 583 if (ng_ether_attach_p != NULL) 584 (*ng_ether_attach_p)(ifp); 585 586 if_printf(ifp, "MAC address: %6D\n", lla, ":"); 587 } 588 589 /* 590 * Perform common duties while detaching an Ethernet interface 591 */ 592 void 593 ether_ifdetach(struct ifnet *ifp) 594 { 595 if_down(ifp); 596 597 if (ng_ether_detach_p != NULL) 598 (*ng_ether_detach_p)(ifp); 599 bpfdetach(ifp); 600 if_detach(ifp); 601 } 602 603 int 604 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 605 { 606 struct ifaddr *ifa = (struct ifaddr *) data; 607 struct ifreq *ifr = (struct ifreq *) data; 608 int error = 0; 609 610 #define IF_INIT(ifp) \ 611 do { \ 612 if (((ifp)->if_flags & IFF_UP) == 0) { \ 613 (ifp)->if_flags |= IFF_UP; \ 614 (ifp)->if_init((ifp)->if_softc); \ 615 } \ 616 } while (0) 617 618 ASSERT_IFNET_SERIALIZED_ALL(ifp); 619 620 switch (command) { 621 case SIOCSIFADDR: 622 switch (ifa->ifa_addr->sa_family) { 623 #ifdef INET 624 case AF_INET: 625 IF_INIT(ifp); /* before arpwhohas */ 626 arp_ifinit(ifp, ifa); 627 break; 628 #endif 629 #ifdef IPX 630 /* 631 * XXX - This code is probably wrong 632 */ 633 case AF_IPX: 634 { 635 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 636 struct arpcom *ac = IFP2AC(ifp); 637 638 if (ipx_nullhost(*ina)) 639 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 640 else 641 bcopy(ina->x_host.c_host, ac->ac_enaddr, 642 sizeof ac->ac_enaddr); 643 644 IF_INIT(ifp); /* Set new address. */ 645 break; 646 } 647 #endif 648 default: 649 IF_INIT(ifp); 650 break; 651 } 652 break; 653 654 case SIOCGIFADDR: 655 bcopy(IFP2AC(ifp)->ac_enaddr, 656 ((struct sockaddr *)ifr->ifr_data)->sa_data, 657 ETHER_ADDR_LEN); 658 break; 659 660 case SIOCSIFMTU: 661 /* 662 * Set the interface MTU. 663 */ 664 if (ifr->ifr_mtu > ETHERMTU) { 665 error = EINVAL; 666 } else { 667 ifp->if_mtu = ifr->ifr_mtu; 668 } 669 break; 670 default: 671 error = EINVAL; 672 break; 673 } 674 return (error); 675 676 #undef IF_INIT 677 } 678 679 int 680 ether_resolvemulti( 681 struct ifnet *ifp, 682 struct sockaddr **llsa, 683 struct sockaddr *sa) 684 { 685 struct sockaddr_dl *sdl; 686 #ifdef INET 687 struct sockaddr_in *sin; 688 #endif 689 #ifdef INET6 690 struct sockaddr_in6 *sin6; 691 #endif 692 u_char *e_addr; 693 694 switch(sa->sa_family) { 695 case AF_LINK: 696 /* 697 * No mapping needed. Just check that it's a valid MC address. 698 */ 699 sdl = (struct sockaddr_dl *)sa; 700 e_addr = LLADDR(sdl); 701 if ((e_addr[0] & 1) != 1) 702 return EADDRNOTAVAIL; 703 *llsa = NULL; 704 return 0; 705 706 #ifdef INET 707 case AF_INET: 708 sin = (struct sockaddr_in *)sa; 709 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 710 return EADDRNOTAVAIL; 711 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 712 sdl->sdl_len = sizeof *sdl; 713 sdl->sdl_family = AF_LINK; 714 sdl->sdl_index = ifp->if_index; 715 sdl->sdl_type = IFT_ETHER; 716 sdl->sdl_alen = ETHER_ADDR_LEN; 717 e_addr = LLADDR(sdl); 718 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 719 *llsa = (struct sockaddr *)sdl; 720 return 0; 721 #endif 722 #ifdef INET6 723 case AF_INET6: 724 sin6 = (struct sockaddr_in6 *)sa; 725 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 726 /* 727 * An IP6 address of 0 means listen to all 728 * of the Ethernet multicast address used for IP6. 729 * (This is used for multicast routers.) 730 */ 731 ifp->if_flags |= IFF_ALLMULTI; 732 *llsa = NULL; 733 return 0; 734 } 735 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 736 return EADDRNOTAVAIL; 737 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 738 sdl->sdl_len = sizeof *sdl; 739 sdl->sdl_family = AF_LINK; 740 sdl->sdl_index = ifp->if_index; 741 sdl->sdl_type = IFT_ETHER; 742 sdl->sdl_alen = ETHER_ADDR_LEN; 743 e_addr = LLADDR(sdl); 744 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 745 *llsa = (struct sockaddr *)sdl; 746 return 0; 747 #endif 748 749 default: 750 /* 751 * Well, the text isn't quite right, but it's the name 752 * that counts... 753 */ 754 return EAFNOSUPPORT; 755 } 756 } 757 758 #if 0 759 /* 760 * This is for reference. We have a table-driven version 761 * of the little-endian crc32 generator, which is faster 762 * than the double-loop. 763 */ 764 uint32_t 765 ether_crc32_le(const uint8_t *buf, size_t len) 766 { 767 uint32_t c, crc, carry; 768 size_t i, j; 769 770 crc = 0xffffffffU; /* initial value */ 771 772 for (i = 0; i < len; i++) { 773 c = buf[i]; 774 for (j = 0; j < 8; j++) { 775 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 776 crc >>= 1; 777 c >>= 1; 778 if (carry) 779 crc = (crc ^ ETHER_CRC_POLY_LE); 780 } 781 } 782 783 return (crc); 784 } 785 #else 786 uint32_t 787 ether_crc32_le(const uint8_t *buf, size_t len) 788 { 789 static const uint32_t crctab[] = { 790 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 791 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 792 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 793 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 794 }; 795 uint32_t crc; 796 size_t i; 797 798 crc = 0xffffffffU; /* initial value */ 799 800 for (i = 0; i < len; i++) { 801 crc ^= buf[i]; 802 crc = (crc >> 4) ^ crctab[crc & 0xf]; 803 crc = (crc >> 4) ^ crctab[crc & 0xf]; 804 } 805 806 return (crc); 807 } 808 #endif 809 810 uint32_t 811 ether_crc32_be(const uint8_t *buf, size_t len) 812 { 813 uint32_t c, crc, carry; 814 size_t i, j; 815 816 crc = 0xffffffffU; /* initial value */ 817 818 for (i = 0; i < len; i++) { 819 c = buf[i]; 820 for (j = 0; j < 8; j++) { 821 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 822 crc <<= 1; 823 c >>= 1; 824 if (carry) 825 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 826 } 827 } 828 829 return (crc); 830 } 831 832 /* 833 * find the size of ethernet header, and call classifier 834 */ 835 void 836 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 837 struct altq_pktattr *pktattr) 838 { 839 struct ether_header *eh; 840 uint16_t ether_type; 841 int hlen, af, hdrsize; 842 caddr_t hdr; 843 844 hlen = sizeof(struct ether_header); 845 eh = mtod(m, struct ether_header *); 846 847 ether_type = ntohs(eh->ether_type); 848 if (ether_type < ETHERMTU) { 849 /* ick! LLC/SNAP */ 850 struct llc *llc = (struct llc *)(eh + 1); 851 hlen += 8; 852 853 if (m->m_len < hlen || 854 llc->llc_dsap != LLC_SNAP_LSAP || 855 llc->llc_ssap != LLC_SNAP_LSAP || 856 llc->llc_control != LLC_UI) 857 goto bad; /* not snap! */ 858 859 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 860 } 861 862 if (ether_type == ETHERTYPE_IP) { 863 af = AF_INET; 864 hdrsize = 20; /* sizeof(struct ip) */ 865 #ifdef INET6 866 } else if (ether_type == ETHERTYPE_IPV6) { 867 af = AF_INET6; 868 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 869 #endif 870 } else 871 goto bad; 872 873 while (m->m_len <= hlen) { 874 hlen -= m->m_len; 875 m = m->m_next; 876 } 877 hdr = m->m_data + hlen; 878 if (m->m_len < hlen + hdrsize) { 879 /* 880 * ip header is not in a single mbuf. this should not 881 * happen in the current code. 882 * (todo: use m_pulldown in the future) 883 */ 884 goto bad; 885 } 886 m->m_data += hlen; 887 m->m_len -= hlen; 888 ifq_classify(ifq, m, af, pktattr); 889 m->m_data -= hlen; 890 m->m_len += hlen; 891 892 return; 893 894 bad: 895 pktattr->pattr_class = NULL; 896 pktattr->pattr_hdr = NULL; 897 pktattr->pattr_af = AF_UNSPEC; 898 } 899 900 static void 901 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 902 const struct ether_header *save_eh) 903 { 904 struct mbuf *m = *m0; 905 906 ether_restore_hdr++; 907 908 /* 909 * Prepend the header, optimize for the common case of 910 * eh pointing into the mbuf. 911 */ 912 if ((const void *)(eh + 1) == (void *)m->m_data) { 913 m->m_data -= ETHER_HDR_LEN; 914 m->m_len += ETHER_HDR_LEN; 915 m->m_pkthdr.len += ETHER_HDR_LEN; 916 } else { 917 ether_prepend_hdr++; 918 919 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 920 if (m != NULL) { 921 bcopy(save_eh, mtod(m, struct ether_header *), 922 ETHER_HDR_LEN); 923 } 924 } 925 *m0 = m; 926 } 927 928 static void 929 ether_input_ipifunc(void *arg) 930 { 931 struct mbuf *m, *next; 932 lwkt_port_t port = cpu_portfn(mycpu->gd_cpuid); 933 934 m = arg; 935 do { 936 next = m->m_nextpkt; 937 m->m_nextpkt = NULL; 938 lwkt_sendmsg(port, &m->m_hdr.mh_netmsg.base.lmsg); 939 m = next; 940 } while (m != NULL); 941 } 942 943 void 944 ether_input_dispatch(struct mbuf_chain *chain) 945 { 946 #ifdef SMP 947 int i; 948 949 logether(disp_beg, NULL); 950 for (i = 0; i < ncpus; ++i) { 951 if (chain[i].mc_head != NULL) { 952 lwkt_send_ipiq(globaldata_find(i), 953 ether_input_ipifunc, chain[i].mc_head); 954 } 955 } 956 #else 957 logether(disp_beg, NULL); 958 if (chain->mc_head != NULL) 959 ether_input_ipifunc(chain->mc_head); 960 #endif 961 logether(disp_end, NULL); 962 } 963 964 void 965 ether_input_chain_init(struct mbuf_chain *chain) 966 { 967 #ifdef SMP 968 int i; 969 970 for (i = 0; i < ncpus; ++i) 971 chain[i].mc_head = chain[i].mc_tail = NULL; 972 #else 973 chain->mc_head = chain->mc_tail = NULL; 974 #endif 975 } 976 977 /* 978 * Upper layer processing for a received Ethernet packet. 979 */ 980 void 981 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 982 { 983 struct ether_header *eh; 984 int isr, discard = 0; 985 u_short ether_type; 986 struct ip_fw *rule = NULL; 987 988 M_ASSERTPKTHDR(m); 989 KASSERT(m->m_len >= ETHER_HDR_LEN, 990 ("ether header is not contiguous!\n")); 991 992 eh = mtod(m, struct ether_header *); 993 994 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 995 struct m_tag *mtag; 996 997 /* Extract info from dummynet tag */ 998 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 999 KKASSERT(mtag != NULL); 1000 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1001 KKASSERT(rule != NULL); 1002 1003 m_tag_delete(m, mtag); 1004 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1005 1006 /* packet is passing the second time */ 1007 goto post_stats; 1008 } 1009 1010 #ifdef CARP 1011 /* 1012 * XXX: Okay, we need to call carp_forus() and - if it is for 1013 * us jump over code that does the normal check 1014 * "ac_enaddr == ether_dhost". The check sequence is a bit 1015 * different from OpenBSD, so we jump over as few code as 1016 * possible, to catch _all_ sanity checks. This needs 1017 * evaluation, to see if the carp ether_dhost values break any 1018 * of these checks! 1019 */ 1020 if (ifp->if_carp) { 1021 /* 1022 * Hold BGL and recheck ifp->if_carp 1023 */ 1024 get_mplock(); 1025 if (ifp->if_carp && carp_forus(ifp->if_carp, eh->ether_dhost)) { 1026 rel_mplock(); 1027 goto post_stats; 1028 } 1029 rel_mplock(); 1030 } 1031 #endif 1032 1033 /* 1034 * We got a packet which was unicast to a different Ethernet 1035 * address. If the driver is working properly, then this 1036 * situation can only happen when the interface is in 1037 * promiscuous mode. We defer the packet discarding until the 1038 * vlan processing is done, so that vlan/bridge or vlan/netgraph 1039 * could work. 1040 */ 1041 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1042 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1043 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1044 if (ether_debug & 1) { 1045 kprintf("%02x:%02x:%02x:%02x:%02x:%02x " 1046 "%02x:%02x:%02x:%02x:%02x:%02x " 1047 "%04x vs %02x:%02x:%02x:%02x:%02x:%02x\n", 1048 eh->ether_dhost[0], 1049 eh->ether_dhost[1], 1050 eh->ether_dhost[2], 1051 eh->ether_dhost[3], 1052 eh->ether_dhost[4], 1053 eh->ether_dhost[5], 1054 eh->ether_shost[0], 1055 eh->ether_shost[1], 1056 eh->ether_shost[2], 1057 eh->ether_shost[3], 1058 eh->ether_shost[4], 1059 eh->ether_shost[5], 1060 eh->ether_type, 1061 ((u_char *)IFP2AC(ifp)->ac_enaddr)[0], 1062 ((u_char *)IFP2AC(ifp)->ac_enaddr)[1], 1063 ((u_char *)IFP2AC(ifp)->ac_enaddr)[2], 1064 ((u_char *)IFP2AC(ifp)->ac_enaddr)[3], 1065 ((u_char *)IFP2AC(ifp)->ac_enaddr)[4], 1066 ((u_char *)IFP2AC(ifp)->ac_enaddr)[5] 1067 ); 1068 } 1069 if ((ether_debug & 2) == 0) 1070 discard = 1; 1071 } 1072 1073 post_stats: 1074 if (IPFW_LOADED && ether_ipfw != 0 && !discard) { 1075 struct ether_header save_eh = *eh; 1076 1077 /* XXX old crufty stuff, needs to be removed */ 1078 m_adj(m, sizeof(struct ether_header)); 1079 1080 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1081 m_freem(m); 1082 return; 1083 } 1084 1085 ether_restore_header(&m, eh, &save_eh); 1086 if (m == NULL) 1087 return; 1088 eh = mtod(m, struct ether_header *); 1089 } 1090 1091 ether_type = ntohs(eh->ether_type); 1092 KKASSERT(ether_type != ETHERTYPE_VLAN); 1093 1094 if (m->m_flags & M_VLANTAG) { 1095 void (*vlan_input_func)(struct mbuf *); 1096 1097 vlan_input_func = vlan_input_p; 1098 if (vlan_input_func != NULL) { 1099 vlan_input_func(m); 1100 } else { 1101 m->m_pkthdr.rcvif->if_noproto++; 1102 m_freem(m); 1103 } 1104 return; 1105 } 1106 1107 /* 1108 * If we have been asked to discard this packet 1109 * (e.g. not for us), drop it before entering 1110 * the upper layer. 1111 */ 1112 if (discard) { 1113 m_freem(m); 1114 return; 1115 } 1116 1117 /* 1118 * Clear protocol specific flags, 1119 * before entering the upper layer. 1120 */ 1121 m->m_flags &= ~M_ETHER_FLAGS; 1122 1123 /* Strip ethernet header. */ 1124 m_adj(m, sizeof(struct ether_header)); 1125 1126 switch (ether_type) { 1127 #ifdef INET 1128 case ETHERTYPE_IP: 1129 if ((m->m_flags & M_LENCHECKED) == 0) { 1130 if (!ip_lengthcheck(&m, 0)) 1131 return; 1132 } 1133 if (ipflow_fastforward(m)) 1134 return; 1135 isr = NETISR_IP; 1136 break; 1137 1138 case ETHERTYPE_ARP: 1139 if (ifp->if_flags & IFF_NOARP) { 1140 /* Discard packet if ARP is disabled on interface */ 1141 m_freem(m); 1142 return; 1143 } 1144 isr = NETISR_ARP; 1145 break; 1146 #endif 1147 1148 #ifdef INET6 1149 case ETHERTYPE_IPV6: 1150 isr = NETISR_IPV6; 1151 break; 1152 #endif 1153 1154 #ifdef IPX 1155 case ETHERTYPE_IPX: 1156 if (ef_inputp) { 1157 /* 1158 * Hold BGL and recheck ef_inputp 1159 */ 1160 get_mplock(); 1161 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1162 rel_mplock(); 1163 return; 1164 } 1165 rel_mplock(); 1166 } 1167 isr = NETISR_IPX; 1168 break; 1169 #endif 1170 1171 #ifdef MPLS 1172 case ETHERTYPE_MPLS: 1173 case ETHERTYPE_MPLS_MCAST: 1174 /* Should have been set by ether_input_chain(). */ 1175 KKASSERT(m->m_flags & M_MPLSLABELED); 1176 isr = NETISR_MPLS; 1177 break; 1178 #endif 1179 1180 default: 1181 /* 1182 * The accurate msgport is not determined before 1183 * we reach here, so recharacterize packet. 1184 */ 1185 m->m_flags &= ~M_HASH; 1186 #ifdef IPX 1187 if (ef_inputp) { 1188 /* 1189 * Hold BGL and recheck ef_inputp 1190 */ 1191 get_mplock(); 1192 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1193 rel_mplock(); 1194 return; 1195 } 1196 rel_mplock(); 1197 } 1198 #endif 1199 if (ng_ether_input_orphan_p != NULL) { 1200 /* 1201 * Put back the ethernet header so netgraph has a 1202 * consistent view of inbound packets. 1203 */ 1204 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 1205 if (m == NULL) { 1206 /* 1207 * M_PREPEND frees the mbuf in case of failure. 1208 */ 1209 return; 1210 } 1211 /* 1212 * Hold BGL and recheck ng_ether_input_orphan_p 1213 */ 1214 get_mplock(); 1215 if (ng_ether_input_orphan_p != NULL) { 1216 ng_ether_input_orphan_p(ifp, m); 1217 rel_mplock(); 1218 return; 1219 } 1220 rel_mplock(); 1221 } 1222 m_freem(m); 1223 return; 1224 } 1225 1226 if (m->m_flags & M_HASH) { 1227 if (&curthread->td_msgport == cpu_portfn(m->m_pkthdr.hash)) { 1228 netisr_handle(isr, m); 1229 return; 1230 } else { 1231 /* 1232 * XXX Something is wrong, 1233 * we probably should panic here! 1234 */ 1235 m->m_flags &= ~M_HASH; 1236 ether_input_wronghash++; 1237 } 1238 } 1239 #ifdef RSS_DEBUG 1240 ether_input_requeue++; 1241 #endif 1242 netisr_queue(isr, m); 1243 } 1244 1245 /* 1246 * First we perform any link layer operations, then continue to the 1247 * upper layers with ether_demux_oncpu(). 1248 */ 1249 static void 1250 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1251 { 1252 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1253 /* 1254 * Receiving interface's flags are changed, when this 1255 * packet is waiting for processing; discard it. 1256 */ 1257 m_freem(m); 1258 return; 1259 } 1260 1261 /* 1262 * Tap the packet off here for a bridge. bridge_input() 1263 * will return NULL if it has consumed the packet, otherwise 1264 * it gets processed as normal. Note that bridge_input() 1265 * will always return the original packet if we need to 1266 * process it locally. 1267 */ 1268 if (ifp->if_bridge) { 1269 KASSERT(bridge_input_p != NULL, 1270 ("%s: if_bridge not loaded!", __func__)); 1271 1272 if(m->m_flags & M_ETHER_BRIDGED) { 1273 m->m_flags &= ~M_ETHER_BRIDGED; 1274 } else { 1275 m = bridge_input_p(ifp, m); 1276 if (m == NULL) 1277 return; 1278 1279 KASSERT(ifp == m->m_pkthdr.rcvif, 1280 ("bridge_input_p changed rcvif\n")); 1281 } 1282 } 1283 1284 /* Handle ng_ether(4) processing, if any */ 1285 if (ng_ether_input_p != NULL) { 1286 /* 1287 * Hold BGL and recheck ng_ether_input_p 1288 */ 1289 get_mplock(); 1290 if (ng_ether_input_p != NULL) 1291 ng_ether_input_p(ifp, &m); 1292 rel_mplock(); 1293 1294 if (m == NULL) 1295 return; 1296 } 1297 1298 /* Continue with upper layer processing */ 1299 ether_demux_oncpu(ifp, m); 1300 } 1301 1302 /* 1303 * Perform certain functions of ether_input_chain(): 1304 * - Test IFF_UP 1305 * - Update statistics 1306 * - Run bpf(4) tap if requested 1307 * Then pass the packet to ether_input_oncpu(). 1308 * 1309 * This function should be used by pseudo interface (e.g. vlan(4)), 1310 * when it tries to claim that the packet is received by it. 1311 * 1312 * REINPUT_KEEPRCVIF 1313 * REINPUT_RUNBPF 1314 */ 1315 void 1316 ether_reinput_oncpu(struct ifnet *ifp, struct mbuf *m, int reinput_flags) 1317 { 1318 /* Discard packet if interface is not up */ 1319 if (!(ifp->if_flags & IFF_UP)) { 1320 m_freem(m); 1321 return; 1322 } 1323 1324 /* 1325 * Change receiving interface. The bridge will often pass a flag to 1326 * ask that this not be done so ARPs get applied to the correct 1327 * side. 1328 */ 1329 if ((reinput_flags & REINPUT_KEEPRCVIF) == 0 || 1330 m->m_pkthdr.rcvif == NULL) { 1331 m->m_pkthdr.rcvif = ifp; 1332 } 1333 1334 /* Update statistics */ 1335 ifp->if_ipackets++; 1336 ifp->if_ibytes += m->m_pkthdr.len; 1337 if (m->m_flags & (M_MCAST | M_BCAST)) 1338 ifp->if_imcasts++; 1339 1340 if (reinput_flags & REINPUT_RUNBPF) 1341 BPF_MTAP(ifp, m); 1342 1343 ether_input_oncpu(ifp, m); 1344 } 1345 1346 static __inline boolean_t 1347 ether_vlancheck(struct mbuf **m0) 1348 { 1349 struct mbuf *m = *m0; 1350 struct ether_header *eh; 1351 uint16_t ether_type; 1352 1353 eh = mtod(m, struct ether_header *); 1354 ether_type = ntohs(eh->ether_type); 1355 1356 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG) == 0) { 1357 /* 1358 * Extract vlan tag if hardware does not do it for us 1359 */ 1360 vlan_ether_decap(&m); 1361 if (m == NULL) 1362 goto failed; 1363 1364 eh = mtod(m, struct ether_header *); 1365 ether_type = ntohs(eh->ether_type); 1366 } 1367 1368 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG)) { 1369 /* 1370 * To prevent possible dangerous recursion, 1371 * we don't do vlan-in-vlan 1372 */ 1373 m->m_pkthdr.rcvif->if_noproto++; 1374 goto failed; 1375 } 1376 KKASSERT(ether_type != ETHERTYPE_VLAN); 1377 1378 m->m_flags |= M_ETHER_VLANCHECKED; 1379 *m0 = m; 1380 return TRUE; 1381 failed: 1382 if (m != NULL) 1383 m_freem(m); 1384 *m0 = NULL; 1385 return FALSE; 1386 } 1387 1388 static void 1389 ether_input_handler(netmsg_t nmsg) 1390 { 1391 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1392 struct ether_header *eh; 1393 struct ifnet *ifp; 1394 struct mbuf *m; 1395 1396 m = nmp->nm_packet; 1397 M_ASSERTPKTHDR(m); 1398 ifp = m->m_pkthdr.rcvif; 1399 1400 eh = mtod(m, struct ether_header *); 1401 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1402 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1403 ifp->if_addrlen) == 0) 1404 m->m_flags |= M_BCAST; 1405 else 1406 m->m_flags |= M_MCAST; 1407 ifp->if_imcasts++; 1408 } 1409 1410 if ((m->m_flags & M_ETHER_VLANCHECKED) == 0) { 1411 if (!ether_vlancheck(&m)) { 1412 KKASSERT(m == NULL); 1413 return; 1414 } 1415 } 1416 1417 ether_input_oncpu(ifp, m); 1418 } 1419 1420 /* 1421 * Send the packet to the target msgport or queue it into 'chain'. 1422 * 1423 * At this point the packet had better be characterized (M_HASH set), 1424 * so we know which cpu to send it to. 1425 */ 1426 static void 1427 ether_dispatch(int isr, struct mbuf *m, struct mbuf_chain *chain) 1428 { 1429 struct netmsg_packet *pmsg; 1430 1431 KKASSERT(m->m_flags & M_HASH); 1432 pmsg = &m->m_hdr.mh_netmsg; 1433 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 1434 0, ether_input_handler); 1435 pmsg->nm_packet = m; 1436 pmsg->base.lmsg.u.ms_result = isr; 1437 1438 if (chain != NULL) { 1439 int cpuid = m->m_pkthdr.hash; 1440 struct mbuf_chain *c; 1441 1442 c = &chain[cpuid]; 1443 if (c->mc_head == NULL) { 1444 c->mc_head = c->mc_tail = m; 1445 } else { 1446 c->mc_tail->m_nextpkt = m; 1447 c->mc_tail = m; 1448 } 1449 m->m_nextpkt = NULL; 1450 } else { 1451 lwkt_sendmsg(cpu_portfn(m->m_pkthdr.hash), &pmsg->base.lmsg); 1452 } 1453 } 1454 1455 /* 1456 * Process a received Ethernet packet. 1457 * 1458 * The ethernet header is assumed to be in the mbuf so the caller 1459 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1460 * bytes in the first mbuf. 1461 * 1462 * - If 'chain' is NULL, this ether frame is sent to the target msgport 1463 * immediately. This situation happens when ether_input_chain is 1464 * accessed through ifnet.if_input. 1465 * 1466 * - If 'chain' is not NULL, this ether frame is queued to the 'chain' 1467 * bucket indexed by the target msgport's cpuid and the target msgport 1468 * is saved in mbuf's m_pkthdr.m_head. Caller of ether_input_chain 1469 * must initialize 'chain' by calling ether_input_chain_init(). 1470 * ether_input_dispatch must be called later to send ether frames 1471 * queued on 'chain' to their target msgport. 1472 */ 1473 void 1474 ether_input_chain(struct ifnet *ifp, struct mbuf *m, const struct pktinfo *pi, 1475 struct mbuf_chain *chain) 1476 { 1477 int isr; 1478 1479 M_ASSERTPKTHDR(m); 1480 1481 /* Discard packet if interface is not up */ 1482 if (!(ifp->if_flags & IFF_UP)) { 1483 m_freem(m); 1484 return; 1485 } 1486 1487 if (m->m_len < sizeof(struct ether_header)) { 1488 /* XXX error in the caller. */ 1489 m_freem(m); 1490 return; 1491 } 1492 1493 m->m_pkthdr.rcvif = ifp; 1494 1495 logether(chain_beg, ifp); 1496 1497 ETHER_BPF_MTAP(ifp, m); 1498 1499 ifp->if_ibytes += m->m_pkthdr.len; 1500 1501 if (ifp->if_flags & IFF_MONITOR) { 1502 struct ether_header *eh; 1503 1504 eh = mtod(m, struct ether_header *); 1505 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1506 ifp->if_imcasts++; 1507 1508 /* 1509 * Interface marked for monitoring; discard packet. 1510 */ 1511 m_freem(m); 1512 1513 logether(chain_end, ifp); 1514 return; 1515 } 1516 1517 /* 1518 * If the packet has been characterized (pi->pi_netisr / M_HASH) 1519 * we can dispatch it immediately without further inspection. 1520 */ 1521 if (pi != NULL && (m->m_flags & M_HASH)) { 1522 #ifdef RSS_DEBUG 1523 ether_pktinfo_try++; 1524 #endif 1525 netisr_hashcheck(pi->pi_netisr, m, pi); 1526 if (m->m_flags & M_HASH) { 1527 ether_dispatch(pi->pi_netisr, m, chain); 1528 #ifdef RSS_DEBUG 1529 ether_pktinfo_hit++; 1530 #endif 1531 logether(chain_end, ifp); 1532 return; 1533 } 1534 } 1535 #ifdef RSS_DEBUG 1536 else if (ifp->if_capenable & IFCAP_RSS) { 1537 if (pi == NULL) 1538 ether_rss_nopi++; 1539 else 1540 ether_rss_nohash++; 1541 } 1542 #endif 1543 1544 /* 1545 * Packet hash will be recalculated by software, 1546 * so clear the M_HASH flag set by the driver; 1547 * the hash value calculated by the hardware may 1548 * not be exactly what we want. 1549 */ 1550 m->m_flags &= ~M_HASH; 1551 1552 if (!ether_vlancheck(&m)) { 1553 KKASSERT(m == NULL); 1554 logether(chain_end, ifp); 1555 return; 1556 } 1557 1558 isr = ether_characterize(&m); 1559 if (m == NULL) { 1560 logether(chain_end, ifp); 1561 return; 1562 } 1563 1564 /* 1565 * Finally dispatch it 1566 */ 1567 ether_dispatch(isr, m, chain); 1568 1569 logether(chain_end, ifp); 1570 } 1571 1572 static int 1573 ether_characterize(struct mbuf **m0) 1574 { 1575 struct mbuf *m = *m0; 1576 struct ether_header *eh; 1577 uint16_t ether_type; 1578 int isr; 1579 1580 eh = mtod(m, struct ether_header *); 1581 ether_type = ntohs(eh->ether_type); 1582 1583 /* 1584 * Map ether type to netisr id. 1585 */ 1586 switch (ether_type) { 1587 #ifdef INET 1588 case ETHERTYPE_IP: 1589 isr = NETISR_IP; 1590 break; 1591 1592 case ETHERTYPE_ARP: 1593 isr = NETISR_ARP; 1594 break; 1595 #endif 1596 1597 #ifdef INET6 1598 case ETHERTYPE_IPV6: 1599 isr = NETISR_IPV6; 1600 break; 1601 #endif 1602 1603 #ifdef IPX 1604 case ETHERTYPE_IPX: 1605 isr = NETISR_IPX; 1606 break; 1607 #endif 1608 1609 #ifdef MPLS 1610 case ETHERTYPE_MPLS: 1611 case ETHERTYPE_MPLS_MCAST: 1612 m->m_flags |= M_MPLSLABELED; 1613 isr = NETISR_MPLS; 1614 break; 1615 #endif 1616 1617 default: 1618 /* 1619 * NETISR_MAX is an invalid value; it is chosen to let 1620 * netisr_characterize() know that we have no clear 1621 * idea where this packet should go. 1622 */ 1623 isr = NETISR_MAX; 1624 break; 1625 } 1626 1627 /* 1628 * Ask the isr to characterize the packet since we couldn't. 1629 * This is an attempt to optimally get us onto the correct protocol 1630 * thread. 1631 */ 1632 netisr_characterize(isr, &m, sizeof(struct ether_header)); 1633 1634 *m0 = m; 1635 return isr; 1636 } 1637 1638 static void 1639 ether_demux_handler(netmsg_t nmsg) 1640 { 1641 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1642 struct ifnet *ifp; 1643 struct mbuf *m; 1644 1645 m = nmp->nm_packet; 1646 M_ASSERTPKTHDR(m); 1647 ifp = m->m_pkthdr.rcvif; 1648 1649 ether_demux_oncpu(ifp, m); 1650 } 1651 1652 void 1653 ether_demux(struct mbuf *m) 1654 { 1655 struct netmsg_packet *pmsg; 1656 int isr; 1657 1658 isr = ether_characterize(&m); 1659 if (m == NULL) 1660 return; 1661 1662 KKASSERT(m->m_flags & M_HASH); 1663 pmsg = &m->m_hdr.mh_netmsg; 1664 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 1665 0, ether_demux_handler); 1666 pmsg->nm_packet = m; 1667 pmsg->base.lmsg.u.ms_result = isr; 1668 1669 lwkt_sendmsg(cpu_portfn(m->m_pkthdr.hash), &pmsg->base.lmsg); 1670 } 1671 1672 MODULE_VERSION(ether, 1); 1673