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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 30 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.33 2003/04/28 15:45:53 archie Exp $ 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_mpls.h" 36 #include "opt_netgraph.h" 37 #include "opt_carp.h" 38 #include "opt_rss.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/globaldata.h> 43 #include <sys/kernel.h> 44 #include <sys/ktr.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/msgport.h> 49 #include <sys/socket.h> 50 #include <sys/sockio.h> 51 #include <sys/sysctl.h> 52 #include <sys/thread.h> 53 54 #include <sys/thread2.h> 55 #include <sys/mplock2.h> 56 57 #include <net/if.h> 58 #include <net/netisr.h> 59 #include <net/route.h> 60 #include <net/if_llc.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/ifq_var.h> 64 #include <net/bpf.h> 65 #include <net/ethernet.h> 66 #include <net/vlan/if_vlan_ether.h> 67 #include <net/vlan/if_vlan_var.h> 68 #include <net/netmsg2.h> 69 #include <net/netisr2.h> 70 71 #if defined(INET) || defined(INET6) 72 #include <netinet/in.h> 73 #include <netinet/ip_var.h> 74 #include <netinet/tcp_var.h> 75 #include <netinet/if_ether.h> 76 #include <netinet/ip_flow.h> 77 #include <net/ipfw/ip_fw.h> 78 #include <net/dummynet/ip_dummynet.h> 79 #endif 80 #ifdef INET6 81 #include <netinet6/nd6.h> 82 #endif 83 84 #ifdef CARP 85 #include <netinet/ip_carp.h> 86 #endif 87 88 #ifdef MPLS 89 #include <netproto/mpls/mpls.h> 90 #endif 91 92 /* netgraph node hooks for ng_ether(4) */ 93 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 94 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 95 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 96 void (*ng_ether_attach_p)(struct ifnet *ifp); 97 void (*ng_ether_detach_p)(struct ifnet *ifp); 98 99 void (*vlan_input_p)(struct mbuf *); 100 101 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 102 struct rtentry *); 103 static void ether_restore_header(struct mbuf **, const struct ether_header *, 104 const struct ether_header *); 105 static int ether_characterize(struct mbuf **); 106 static void ether_dispatch(int, struct mbuf *, int); 107 108 /* 109 * if_bridge support 110 */ 111 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 112 int (*bridge_output_p)(struct ifnet *, struct mbuf *); 113 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 114 struct ifnet *(*bridge_interface_p)(void *if_bridge); 115 116 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 117 struct sockaddr *); 118 119 /* 120 * if_lagg(4) support 121 */ 122 void (*lagg_input_p)(struct ifnet *, struct mbuf *); 123 int (*lagg_output_p)(struct ifnet *, struct mbuf *); 124 125 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 126 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 127 }; 128 129 #define gotoerr(e) do { error = (e); goto bad; } while (0) 130 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 131 132 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 133 struct ip_fw **rule, 134 const struct ether_header *eh); 135 136 static int ether_ipfw; 137 static u_long ether_restore_hdr; 138 static u_long ether_prepend_hdr; 139 static u_long ether_input_wronghash; 140 static int ether_debug; 141 142 #ifdef RSS_DEBUG 143 static u_long ether_pktinfo_try; 144 static u_long ether_pktinfo_hit; 145 static u_long ether_rss_nopi; 146 static u_long ether_rss_nohash; 147 static u_long ether_input_requeue; 148 #endif 149 static u_long ether_input_wronghwhash; 150 static int ether_input_ckhash; 151 152 #define ETHER_TSOLEN_DEFAULT (4 * ETHERMTU) 153 154 static int ether_tsolen_default = ETHER_TSOLEN_DEFAULT; 155 TUNABLE_INT("net.link.ether.tsolen", ðer_tsolen_default); 156 157 SYSCTL_DECL(_net_link); 158 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 159 SYSCTL_INT(_net_link_ether, OID_AUTO, debug, CTLFLAG_RW, 160 ðer_debug, 0, "Ether debug"); 161 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 162 ðer_ipfw, 0, "Pass ether pkts through firewall"); 163 SYSCTL_ULONG(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW, 164 ðer_restore_hdr, 0, "# of ether header restoration"); 165 SYSCTL_ULONG(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW, 166 ðer_prepend_hdr, 0, 167 "# of ether header restoration which prepends mbuf"); 168 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghash, CTLFLAG_RW, 169 ðer_input_wronghash, 0, "# of input packets with wrong hash"); 170 SYSCTL_INT(_net_link_ether, OID_AUTO, tsolen, CTLFLAG_RW, 171 ðer_tsolen_default, 0, "Default max TSO length"); 172 173 #ifdef RSS_DEBUG 174 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nopi, CTLFLAG_RW, 175 ðer_rss_nopi, 0, "# of packets do not have pktinfo"); 176 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nohash, CTLFLAG_RW, 177 ðer_rss_nohash, 0, "# of packets do not have hash"); 178 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_try, CTLFLAG_RW, 179 ðer_pktinfo_try, 0, 180 "# of tries to find packets' msgport using pktinfo"); 181 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_hit, CTLFLAG_RW, 182 ðer_pktinfo_hit, 0, 183 "# of packets whose msgport are found using pktinfo"); 184 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_requeue, CTLFLAG_RW, 185 ðer_input_requeue, 0, "# of input packets gets requeued"); 186 #endif 187 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghwhash, CTLFLAG_RW, 188 ðer_input_wronghwhash, 0, "# of input packets with wrong hw hash"); 189 SYSCTL_INT(_net_link_ether, OID_AUTO, always_ckhash, CTLFLAG_RW, 190 ðer_input_ckhash, 0, "always check hash"); 191 192 #define ETHER_KTR_STR "ifp=%p" 193 #define ETHER_KTR_ARGS struct ifnet *ifp 194 #ifndef KTR_ETHERNET 195 #define KTR_ETHERNET KTR_ALL 196 #endif 197 KTR_INFO_MASTER(ether); 198 KTR_INFO(KTR_ETHERNET, ether, pkt_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARGS); 199 KTR_INFO(KTR_ETHERNET, ether, pkt_end, 1, ETHER_KTR_STR, ETHER_KTR_ARGS); 200 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARGS); 201 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARGS); 202 #define logether(name, arg) KTR_LOG(ether_ ## name, arg) 203 204 /* 205 * Ethernet output routine. 206 * Encapsulate a packet of type family for the local net. 207 * Use trailer local net encapsulation if enough data in first 208 * packet leaves a multiple of 512 bytes of data in remainder. 209 * Assumes that ifp is actually pointer to arpcom structure. 210 */ 211 static int 212 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 213 struct rtentry *rt) 214 { 215 struct ether_header *eh, *deh; 216 u_char *edst; 217 int loop_copy = 0; 218 int hlen = ETHER_HDR_LEN; /* link layer header length */ 219 struct arpcom *ac = IFP2AC(ifp); 220 int error; 221 222 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 223 224 if (ifp->if_flags & IFF_MONITOR) 225 gotoerr(ENETDOWN); 226 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 227 gotoerr(ENETDOWN); 228 229 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 230 if (m == NULL) 231 return (ENOBUFS); 232 m->m_pkthdr.csum_lhlen = sizeof(struct ether_header); 233 eh = mtod(m, struct ether_header *); 234 edst = eh->ether_dhost; 235 236 /* 237 * Fill in the destination ethernet address and frame type. 238 */ 239 switch (dst->sa_family) { 240 #ifdef INET 241 case AF_INET: 242 if (!arpresolve(ifp, rt, m, dst, edst)) 243 return (0); /* if not yet resolved */ 244 #ifdef MPLS 245 if (m->m_flags & M_MPLSLABELED) 246 eh->ether_type = htons(ETHERTYPE_MPLS); 247 else 248 #endif 249 eh->ether_type = htons(ETHERTYPE_IP); 250 break; 251 #endif 252 #ifdef INET6 253 case AF_INET6: 254 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 255 return (0); /* Something bad happenned. */ 256 eh->ether_type = htons(ETHERTYPE_IPV6); 257 break; 258 #endif 259 case pseudo_AF_HDRCMPLT: 260 case AF_UNSPEC: 261 loop_copy = -1; /* if this is for us, don't do it */ 262 deh = (struct ether_header *)dst->sa_data; 263 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 264 eh->ether_type = deh->ether_type; 265 break; 266 267 default: 268 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 269 gotoerr(EAFNOSUPPORT); 270 } 271 272 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 273 memcpy(eh->ether_shost, 274 ((struct ether_header *)dst->sa_data)->ether_shost, 275 ETHER_ADDR_LEN); 276 else 277 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 278 279 /* 280 * Bridges require special output handling. 281 */ 282 if (ifp->if_bridge) { 283 KASSERT(bridge_output_p != NULL, 284 ("%s: if_bridge not loaded!", __func__)); 285 return bridge_output_p(ifp, m); 286 } 287 #if XXX 288 if (ifp->if_lagg) { 289 KASSERT(lagg_output_p != NULL, 290 ("%s: if_lagg not loaded!", __func__)); 291 return lagg_output_p(ifp, m); 292 } 293 #endif 294 295 /* 296 * If a simplex interface, and the packet is being sent to our 297 * Ethernet address or a broadcast address, loopback a copy. 298 * XXX To make a simplex device behave exactly like a duplex 299 * device, we should copy in the case of sending to our own 300 * ethernet address (thus letting the original actually appear 301 * on the wire). However, we don't do that here for security 302 * reasons and compatibility with the original behavior. 303 */ 304 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 305 int csum_flags = 0; 306 307 if (m->m_pkthdr.csum_flags & CSUM_IP) 308 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 309 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 310 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 311 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 312 struct mbuf *n; 313 314 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 315 n->m_pkthdr.csum_flags |= csum_flags; 316 if (csum_flags & CSUM_DATA_VALID) 317 n->m_pkthdr.csum_data = 0xffff; 318 if_simloop(ifp, n, dst->sa_family, hlen); 319 } else 320 IFNET_STAT_INC(ifp, iqdrops, 1); 321 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 322 ETHER_ADDR_LEN) == 0) { 323 m->m_pkthdr.csum_flags |= csum_flags; 324 if (csum_flags & CSUM_DATA_VALID) 325 m->m_pkthdr.csum_data = 0xffff; 326 if_simloop(ifp, m, dst->sa_family, hlen); 327 return (0); /* XXX */ 328 } 329 } 330 331 #ifdef CARP 332 if (ifp->if_type == IFT_CARP) { 333 ifp = carp_parent(ifp); 334 if (ifp == NULL) 335 gotoerr(ENETUNREACH); 336 337 ac = IFP2AC(ifp); 338 339 /* 340 * Check precondition again 341 */ 342 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 343 344 if (ifp->if_flags & IFF_MONITOR) 345 gotoerr(ENETDOWN); 346 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 347 (IFF_UP | IFF_RUNNING)) 348 gotoerr(ENETDOWN); 349 } 350 #endif 351 352 /* Handle ng_ether(4) processing, if any */ 353 if (ng_ether_output_p != NULL) { 354 /* 355 * Hold BGL and recheck ng_ether_output_p 356 */ 357 get_mplock(); 358 if (ng_ether_output_p != NULL) { 359 if ((error = ng_ether_output_p(ifp, &m)) != 0) { 360 rel_mplock(); 361 goto bad; 362 } 363 if (m == NULL) { 364 rel_mplock(); 365 return (0); 366 } 367 } 368 rel_mplock(); 369 } 370 371 /* Continue with link-layer output */ 372 return ether_output_frame(ifp, m); 373 374 bad: 375 m_freem(m); 376 return (error); 377 } 378 379 /* 380 * Returns the bridge interface an ifp is associated 381 * with. 382 * 383 * Only call if ifp->if_bridge != NULL. 384 */ 385 struct ifnet * 386 ether_bridge_interface(struct ifnet *ifp) 387 { 388 if (bridge_interface_p) 389 return(bridge_interface_p(ifp->if_bridge)); 390 return (ifp); 391 } 392 393 /* 394 * Ethernet link layer output routine to send a raw frame to the device. 395 * 396 * This assumes that the 14 byte Ethernet header is present and contiguous 397 * in the first mbuf. 398 */ 399 int 400 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 401 { 402 struct ip_fw *rule = NULL; 403 int error = 0; 404 struct altq_pktattr pktattr; 405 406 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 407 408 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 409 struct m_tag *mtag; 410 411 /* Extract info from dummynet tag */ 412 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 413 KKASSERT(mtag != NULL); 414 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 415 KKASSERT(rule != NULL); 416 417 m_tag_delete(m, mtag); 418 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 419 } 420 421 if (ifq_is_enabled(&ifp->if_snd)) 422 altq_etherclassify(&ifp->if_snd, m, &pktattr); 423 crit_enter(); 424 if (IPFW_LOADED && ether_ipfw != 0) { 425 struct ether_header save_eh, *eh; 426 427 eh = mtod(m, struct ether_header *); 428 save_eh = *eh; 429 m_adj(m, ETHER_HDR_LEN); 430 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 431 crit_exit(); 432 if (m != NULL) { 433 m_freem(m); 434 return ENOBUFS; /* pkt dropped */ 435 } else 436 return 0; /* consumed e.g. in a pipe */ 437 } 438 439 /* packet was ok, restore the ethernet header */ 440 ether_restore_header(&m, eh, &save_eh); 441 if (m == NULL) { 442 crit_exit(); 443 return ENOBUFS; 444 } 445 } 446 crit_exit(); 447 448 /* 449 * Queue message on interface, update output statistics if 450 * successful, and start output if interface not yet active. 451 */ 452 error = ifq_dispatch(ifp, m, &pktattr); 453 return (error); 454 } 455 456 /* 457 * ipfw processing for ethernet packets (in and out). 458 * The second parameter is NULL from ether_demux(), and ifp from 459 * ether_output_frame(). 460 */ 461 static boolean_t 462 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 463 const struct ether_header *eh) 464 { 465 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */ 466 struct ip_fw_args args; 467 struct m_tag *mtag; 468 struct mbuf *m; 469 int i; 470 471 if (*rule != NULL && fw_one_pass) 472 return TRUE; /* dummynet packet, already partially processed */ 473 474 /* 475 * I need some amount of data to be contiguous. 476 */ 477 i = min((*m0)->m_pkthdr.len, max_protohdr); 478 if ((*m0)->m_len < i) { 479 *m0 = m_pullup(*m0, i); 480 if (*m0 == NULL) 481 return FALSE; 482 } 483 484 /* 485 * Clean up tags 486 */ 487 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 488 m_tag_delete(*m0, mtag); 489 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 490 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 491 KKASSERT(mtag != NULL); 492 m_tag_delete(*m0, mtag); 493 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 494 } 495 496 args.m = *m0; /* the packet we are looking at */ 497 args.oif = dst; /* destination, if any */ 498 args.rule = *rule; /* matching rule to restart */ 499 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 500 i = ip_fw_chk_ptr(&args); 501 *m0 = args.m; 502 *rule = args.rule; 503 504 if (*m0 == NULL) 505 return FALSE; 506 507 switch (i) { 508 case IP_FW_PASS: 509 return TRUE; 510 511 case IP_FW_DIVERT: 512 case IP_FW_TEE: 513 case IP_FW_DENY: 514 /* 515 * XXX at some point add support for divert/forward actions. 516 * If none of the above matches, we have to drop the pkt. 517 */ 518 return FALSE; 519 520 case IP_FW_DUMMYNET: 521 /* 522 * Pass the pkt to dummynet, which consumes it. 523 */ 524 m = *m0; /* pass the original to dummynet */ 525 *m0 = NULL; /* and nothing back to the caller */ 526 527 ether_restore_header(&m, eh, &save_eh); 528 if (m == NULL) 529 return FALSE; 530 531 ip_fw_dn_io_ptr(m, args.cookie, 532 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 533 ip_dn_queue(m); 534 return FALSE; 535 536 default: 537 panic("unknown ipfw return value: %d", i); 538 } 539 } 540 541 /* 542 * Perform common duties while attaching to interface list 543 */ 544 void 545 ether_ifattach(struct ifnet *ifp, const uint8_t *lla, 546 lwkt_serialize_t serializer) 547 { 548 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 549 serializer); 550 } 551 552 void 553 ether_ifattach_bpf(struct ifnet *ifp, const uint8_t *lla, 554 u_int dlt, u_int hdrlen, lwkt_serialize_t serializer) 555 { 556 struct sockaddr_dl *sdl; 557 char ethstr[ETHER_ADDRSTRLEN + 1]; 558 struct ifaltq *ifq; 559 int i; 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 ifq = &ifp->if_snd; 566 for (i = 0; i < ifq->altq_subq_cnt; ++i) { 567 struct ifaltq_subque *ifsq = ifq_get_subq(ifq, i); 568 569 ifsq->ifsq_maxbcnt = ifsq->ifsq_maxlen * 570 (ETHER_MAX_LEN - ETHER_CRC_LEN); 571 } 572 ifp->if_mtu = ETHERMTU; 573 if (ifp->if_tsolen <= 0) { 574 if ((ether_tsolen_default / ETHERMTU) < 2) { 575 kprintf("ether TSO maxlen %d -> %d\n", 576 ether_tsolen_default, ETHER_TSOLEN_DEFAULT); 577 ether_tsolen_default = ETHER_TSOLEN_DEFAULT; 578 } 579 ifp->if_tsolen = ether_tsolen_default; 580 } 581 if (ifp->if_baudrate == 0) 582 ifp->if_baudrate = 10000000; 583 ifp->if_output = ether_output; 584 ifp->if_input = ether_input; 585 ifp->if_resolvemulti = ether_resolvemulti; 586 ifp->if_broadcastaddr = etherbroadcastaddr; 587 sdl = IF_LLSOCKADDR(ifp); 588 sdl->sdl_type = IFT_ETHER; 589 sdl->sdl_alen = ifp->if_addrlen; 590 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 591 /* 592 * XXX Keep the current drivers happy. 593 * XXX Remove once all drivers have been cleaned up 594 */ 595 if (lla != IFP2AC(ifp)->ac_enaddr) 596 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 597 bpfattach(ifp, dlt, hdrlen); 598 if (ng_ether_attach_p != NULL) 599 (*ng_ether_attach_p)(ifp); 600 601 if_printf(ifp, "MAC address: %s\n", kether_ntoa(lla, ethstr)); 602 } 603 604 /* 605 * Perform common duties while detaching an Ethernet interface 606 */ 607 void 608 ether_ifdetach(struct ifnet *ifp) 609 { 610 if_down(ifp); 611 612 if (ng_ether_detach_p != NULL) 613 (*ng_ether_detach_p)(ifp); 614 bpfdetach(ifp); 615 if_detach(ifp); 616 } 617 618 int 619 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 620 { 621 struct ifaddr *ifa = (struct ifaddr *) data; 622 struct ifreq *ifr = (struct ifreq *) data; 623 int error = 0; 624 625 #define IF_INIT(ifp) \ 626 do { \ 627 if (((ifp)->if_flags & IFF_UP) == 0) { \ 628 (ifp)->if_flags |= IFF_UP; \ 629 (ifp)->if_init((ifp)->if_softc); \ 630 } \ 631 } while (0) 632 633 ASSERT_IFNET_SERIALIZED_ALL(ifp); 634 635 switch (command) { 636 case SIOCSIFADDR: 637 switch (ifa->ifa_addr->sa_family) { 638 #ifdef INET 639 case AF_INET: 640 IF_INIT(ifp); /* before arpwhohas */ 641 arp_ifinit(ifp, ifa); 642 break; 643 #endif 644 default: 645 IF_INIT(ifp); 646 break; 647 } 648 break; 649 650 case SIOCGIFADDR: 651 bcopy(IFP2AC(ifp)->ac_enaddr, 652 ((struct sockaddr *)ifr->ifr_data)->sa_data, 653 ETHER_ADDR_LEN); 654 break; 655 656 case SIOCSIFMTU: 657 /* 658 * Set the interface MTU. 659 */ 660 if (ifr->ifr_mtu > ETHERMTU) { 661 error = EINVAL; 662 } else { 663 ifp->if_mtu = ifr->ifr_mtu; 664 } 665 break; 666 default: 667 error = EINVAL; 668 break; 669 } 670 return (error); 671 672 #undef IF_INIT 673 } 674 675 int 676 ether_resolvemulti( 677 struct ifnet *ifp, 678 struct sockaddr **llsa, 679 struct sockaddr *sa) 680 { 681 struct sockaddr_dl *sdl; 682 #ifdef INET 683 struct sockaddr_in *sin; 684 #endif 685 #ifdef INET6 686 struct sockaddr_in6 *sin6; 687 #endif 688 u_char *e_addr; 689 690 switch(sa->sa_family) { 691 case AF_LINK: 692 /* 693 * No mapping needed. Just check that it's a valid MC address. 694 */ 695 sdl = (struct sockaddr_dl *)sa; 696 e_addr = LLADDR(sdl); 697 if ((e_addr[0] & 1) != 1) 698 return EADDRNOTAVAIL; 699 *llsa = NULL; 700 return 0; 701 702 #ifdef INET 703 case AF_INET: 704 sin = (struct sockaddr_in *)sa; 705 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 706 return EADDRNOTAVAIL; 707 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 708 sdl->sdl_len = sizeof *sdl; 709 sdl->sdl_family = AF_LINK; 710 sdl->sdl_index = ifp->if_index; 711 sdl->sdl_type = IFT_ETHER; 712 sdl->sdl_alen = ETHER_ADDR_LEN; 713 e_addr = LLADDR(sdl); 714 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 715 *llsa = (struct sockaddr *)sdl; 716 return 0; 717 #endif 718 #ifdef INET6 719 case AF_INET6: 720 sin6 = (struct sockaddr_in6 *)sa; 721 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 722 /* 723 * An IP6 address of 0 means listen to all 724 * of the Ethernet multicast address used for IP6. 725 * (This is used for multicast routers.) 726 */ 727 ifp->if_flags |= IFF_ALLMULTI; 728 *llsa = NULL; 729 return 0; 730 } 731 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 732 return EADDRNOTAVAIL; 733 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 734 sdl->sdl_len = sizeof *sdl; 735 sdl->sdl_family = AF_LINK; 736 sdl->sdl_index = ifp->if_index; 737 sdl->sdl_type = IFT_ETHER; 738 sdl->sdl_alen = ETHER_ADDR_LEN; 739 e_addr = LLADDR(sdl); 740 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 741 *llsa = (struct sockaddr *)sdl; 742 return 0; 743 #endif 744 745 default: 746 /* 747 * Well, the text isn't quite right, but it's the name 748 * that counts... 749 */ 750 return EAFNOSUPPORT; 751 } 752 } 753 754 #if 0 755 /* 756 * This is for reference. We have a table-driven version 757 * of the little-endian crc32 generator, which is faster 758 * than the double-loop. 759 */ 760 uint32_t 761 ether_crc32_le(const uint8_t *buf, size_t len) 762 { 763 uint32_t c, crc, carry; 764 size_t i, j; 765 766 crc = 0xffffffffU; /* initial value */ 767 768 for (i = 0; i < len; i++) { 769 c = buf[i]; 770 for (j = 0; j < 8; j++) { 771 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 772 crc >>= 1; 773 c >>= 1; 774 if (carry) 775 crc = (crc ^ ETHER_CRC_POLY_LE); 776 } 777 } 778 779 return (crc); 780 } 781 #else 782 uint32_t 783 ether_crc32_le(const uint8_t *buf, size_t len) 784 { 785 static const uint32_t crctab[] = { 786 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 787 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 788 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 789 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 790 }; 791 uint32_t crc; 792 size_t i; 793 794 crc = 0xffffffffU; /* initial value */ 795 796 for (i = 0; i < len; i++) { 797 crc ^= buf[i]; 798 crc = (crc >> 4) ^ crctab[crc & 0xf]; 799 crc = (crc >> 4) ^ crctab[crc & 0xf]; 800 } 801 802 return (crc); 803 } 804 #endif 805 806 uint32_t 807 ether_crc32_be(const uint8_t *buf, size_t len) 808 { 809 uint32_t c, crc, carry; 810 size_t i, j; 811 812 crc = 0xffffffffU; /* initial value */ 813 814 for (i = 0; i < len; i++) { 815 c = buf[i]; 816 for (j = 0; j < 8; j++) { 817 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 818 crc <<= 1; 819 c >>= 1; 820 if (carry) 821 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 822 } 823 } 824 825 return (crc); 826 } 827 828 /* 829 * find the size of ethernet header, and call classifier 830 */ 831 void 832 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 833 struct altq_pktattr *pktattr) 834 { 835 struct ether_header *eh; 836 uint16_t ether_type; 837 int hlen, af, hdrsize; 838 839 hlen = sizeof(struct ether_header); 840 eh = mtod(m, struct ether_header *); 841 842 ether_type = ntohs(eh->ether_type); 843 if (ether_type < ETHERMTU) { 844 /* ick! LLC/SNAP */ 845 struct llc *llc = (struct llc *)(eh + 1); 846 hlen += 8; 847 848 if (m->m_len < hlen || 849 llc->llc_dsap != LLC_SNAP_LSAP || 850 llc->llc_ssap != LLC_SNAP_LSAP || 851 llc->llc_control != LLC_UI) 852 goto bad; /* not snap! */ 853 854 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 855 } 856 857 if (ether_type == ETHERTYPE_IP) { 858 af = AF_INET; 859 hdrsize = 20; /* sizeof(struct ip) */ 860 #ifdef INET6 861 } else if (ether_type == ETHERTYPE_IPV6) { 862 af = AF_INET6; 863 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 864 #endif 865 } else 866 goto bad; 867 868 while (m->m_len <= hlen) { 869 hlen -= m->m_len; 870 m = m->m_next; 871 } 872 if (m->m_len < hlen + hdrsize) { 873 /* 874 * ip header is not in a single mbuf. this should not 875 * happen in the current code. 876 * (todo: use m_pulldown in the future) 877 */ 878 goto bad; 879 } 880 m->m_data += hlen; 881 m->m_len -= hlen; 882 ifq_classify(ifq, m, af, pktattr); 883 m->m_data -= hlen; 884 m->m_len += hlen; 885 886 return; 887 888 bad: 889 pktattr->pattr_class = NULL; 890 pktattr->pattr_hdr = NULL; 891 pktattr->pattr_af = AF_UNSPEC; 892 } 893 894 static void 895 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 896 const struct ether_header *save_eh) 897 { 898 struct mbuf *m = *m0; 899 900 ether_restore_hdr++; 901 902 /* 903 * Prepend the header, optimize for the common case of 904 * eh pointing into the mbuf. 905 */ 906 if ((const void *)(eh + 1) == (void *)m->m_data) { 907 m->m_data -= ETHER_HDR_LEN; 908 m->m_len += ETHER_HDR_LEN; 909 m->m_pkthdr.len += ETHER_HDR_LEN; 910 } else { 911 ether_prepend_hdr++; 912 913 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 914 if (m != NULL) { 915 bcopy(save_eh, mtod(m, struct ether_header *), 916 ETHER_HDR_LEN); 917 } 918 } 919 *m0 = m; 920 } 921 922 /* 923 * Upper layer processing for a received Ethernet packet. 924 */ 925 void 926 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 927 { 928 struct ether_header *eh; 929 int isr, discard = 0; 930 u_short ether_type; 931 struct ip_fw *rule = NULL; 932 933 M_ASSERTPKTHDR(m); 934 KASSERT(m->m_len >= ETHER_HDR_LEN, 935 ("ether header is not contiguous!")); 936 937 eh = mtod(m, struct ether_header *); 938 939 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 940 struct m_tag *mtag; 941 942 /* Extract info from dummynet tag */ 943 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 944 KKASSERT(mtag != NULL); 945 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 946 KKASSERT(rule != NULL); 947 948 m_tag_delete(m, mtag); 949 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 950 951 /* packet is passing the second time */ 952 goto post_stats; 953 } 954 955 /* 956 * We got a packet which was unicast to a different Ethernet 957 * address. If the driver is working properly, then this 958 * situation can only happen when the interface is in 959 * promiscuous mode. We defer the packet discarding until the 960 * vlan processing is done, so that vlan/bridge or vlan/netgraph 961 * could work. 962 */ 963 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 964 !ETHER_IS_MULTICAST(eh->ether_dhost) && 965 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 966 if (ether_debug & 1) { 967 kprintf("%02x:%02x:%02x:%02x:%02x:%02x " 968 "%02x:%02x:%02x:%02x:%02x:%02x " 969 "%04x vs %02x:%02x:%02x:%02x:%02x:%02x\n", 970 eh->ether_dhost[0], 971 eh->ether_dhost[1], 972 eh->ether_dhost[2], 973 eh->ether_dhost[3], 974 eh->ether_dhost[4], 975 eh->ether_dhost[5], 976 eh->ether_shost[0], 977 eh->ether_shost[1], 978 eh->ether_shost[2], 979 eh->ether_shost[3], 980 eh->ether_shost[4], 981 eh->ether_shost[5], 982 eh->ether_type, 983 ((u_char *)IFP2AC(ifp)->ac_enaddr)[0], 984 ((u_char *)IFP2AC(ifp)->ac_enaddr)[1], 985 ((u_char *)IFP2AC(ifp)->ac_enaddr)[2], 986 ((u_char *)IFP2AC(ifp)->ac_enaddr)[3], 987 ((u_char *)IFP2AC(ifp)->ac_enaddr)[4], 988 ((u_char *)IFP2AC(ifp)->ac_enaddr)[5] 989 ); 990 } 991 if ((ether_debug & 2) == 0) 992 discard = 1; 993 } 994 995 post_stats: 996 if (IPFW_LOADED && ether_ipfw != 0 && !discard) { 997 struct ether_header save_eh = *eh; 998 999 /* XXX old crufty stuff, needs to be removed */ 1000 m_adj(m, sizeof(struct ether_header)); 1001 1002 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1003 m_freem(m); 1004 return; 1005 } 1006 1007 ether_restore_header(&m, eh, &save_eh); 1008 if (m == NULL) 1009 return; 1010 eh = mtod(m, struct ether_header *); 1011 } 1012 1013 ether_type = ntohs(eh->ether_type); 1014 KKASSERT(ether_type != ETHERTYPE_VLAN); 1015 1016 /* Handle input from a lagg(4) port */ 1017 if (ifp->if_type == IFT_IEEE8023ADLAG) { 1018 KASSERT(lagg_input_p != NULL, 1019 ("%s: if_lagg not loaded!", __func__)); 1020 (*lagg_input_p)(ifp, m); 1021 return; 1022 } 1023 1024 if (m->m_flags & M_VLANTAG) { 1025 void (*vlan_input_func)(struct mbuf *); 1026 1027 vlan_input_func = vlan_input_p; 1028 if (vlan_input_func != NULL) { 1029 vlan_input_func(m); 1030 } else { 1031 IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1); 1032 m_freem(m); 1033 } 1034 return; 1035 } 1036 1037 /* 1038 * If we have been asked to discard this packet 1039 * (e.g. not for us), drop it before entering 1040 * the upper layer. 1041 */ 1042 if (discard) { 1043 m_freem(m); 1044 return; 1045 } 1046 1047 /* 1048 * Clear protocol specific flags, 1049 * before entering the upper layer. 1050 */ 1051 m->m_flags &= ~M_ETHER_FLAGS; 1052 1053 /* Strip ethernet header. */ 1054 m_adj(m, sizeof(struct ether_header)); 1055 1056 switch (ether_type) { 1057 #ifdef INET 1058 case ETHERTYPE_IP: 1059 if ((m->m_flags & M_LENCHECKED) == 0) { 1060 if (!ip_lengthcheck(&m, 0)) 1061 return; 1062 } 1063 if (ipflow_fastforward(m)) 1064 return; 1065 isr = NETISR_IP; 1066 break; 1067 1068 case ETHERTYPE_ARP: 1069 if (ifp->if_flags & IFF_NOARP) { 1070 /* Discard packet if ARP is disabled on interface */ 1071 m_freem(m); 1072 return; 1073 } 1074 isr = NETISR_ARP; 1075 break; 1076 #endif 1077 1078 #ifdef INET6 1079 case ETHERTYPE_IPV6: 1080 isr = NETISR_IPV6; 1081 break; 1082 #endif 1083 1084 #ifdef MPLS 1085 case ETHERTYPE_MPLS: 1086 case ETHERTYPE_MPLS_MCAST: 1087 /* Should have been set by ether_input(). */ 1088 KKASSERT(m->m_flags & M_MPLSLABELED); 1089 isr = NETISR_MPLS; 1090 break; 1091 #endif 1092 1093 default: 1094 /* 1095 * The accurate msgport is not determined before 1096 * we reach here, so recharacterize packet. 1097 */ 1098 m->m_flags &= ~M_HASH; 1099 if (ng_ether_input_orphan_p != NULL) { 1100 /* 1101 * Put back the ethernet header so netgraph has a 1102 * consistent view of inbound packets. 1103 */ 1104 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 1105 if (m == NULL) { 1106 /* 1107 * M_PREPEND frees the mbuf in case of failure. 1108 */ 1109 return; 1110 } 1111 /* 1112 * Hold BGL and recheck ng_ether_input_orphan_p 1113 */ 1114 get_mplock(); 1115 if (ng_ether_input_orphan_p != NULL) { 1116 ng_ether_input_orphan_p(ifp, m); 1117 rel_mplock(); 1118 return; 1119 } 1120 rel_mplock(); 1121 } 1122 m_freem(m); 1123 return; 1124 } 1125 1126 if (m->m_flags & M_HASH) { 1127 if (&curthread->td_msgport == 1128 netisr_hashport(m->m_pkthdr.hash)) { 1129 netisr_handle(isr, m); 1130 return; 1131 } else { 1132 /* 1133 * XXX Something is wrong, 1134 * we probably should panic here! 1135 */ 1136 m->m_flags &= ~M_HASH; 1137 atomic_add_long(ðer_input_wronghash, 1); 1138 } 1139 } 1140 #ifdef RSS_DEBUG 1141 atomic_add_long(ðer_input_requeue, 1); 1142 #endif 1143 netisr_queue(isr, m); 1144 } 1145 1146 /* 1147 * First we perform any link layer operations, then continue to the 1148 * upper layers with ether_demux_oncpu(). 1149 */ 1150 static void 1151 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1152 { 1153 #ifdef CARP 1154 void *carp; 1155 #endif 1156 1157 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1158 /* 1159 * Receiving interface's flags are changed, when this 1160 * packet is waiting for processing; discard it. 1161 */ 1162 m_freem(m); 1163 return; 1164 } 1165 1166 /* 1167 * Tap the packet off here for a bridge. bridge_input() 1168 * will return NULL if it has consumed the packet, otherwise 1169 * it gets processed as normal. Note that bridge_input() 1170 * will always return the original packet if we need to 1171 * process it locally. 1172 */ 1173 if (ifp->if_bridge) { 1174 KASSERT(bridge_input_p != NULL, 1175 ("%s: if_bridge not loaded!", __func__)); 1176 1177 if(m->m_flags & M_ETHER_BRIDGED) { 1178 m->m_flags &= ~M_ETHER_BRIDGED; 1179 } else { 1180 m = bridge_input_p(ifp, m); 1181 if (m == NULL) 1182 return; 1183 1184 KASSERT(ifp == m->m_pkthdr.rcvif, 1185 ("bridge_input_p changed rcvif")); 1186 } 1187 } 1188 1189 #ifdef CARP 1190 carp = ifp->if_carp; 1191 if (carp) { 1192 m = carp_input(carp, m); 1193 if (m == NULL) 1194 return; 1195 KASSERT(ifp == m->m_pkthdr.rcvif, 1196 ("carp_input changed rcvif")); 1197 } 1198 #endif 1199 1200 /* Handle ng_ether(4) processing, if any */ 1201 if (ng_ether_input_p != NULL) { 1202 /* 1203 * Hold BGL and recheck ng_ether_input_p 1204 */ 1205 get_mplock(); 1206 if (ng_ether_input_p != NULL) 1207 ng_ether_input_p(ifp, &m); 1208 rel_mplock(); 1209 1210 if (m == NULL) 1211 return; 1212 } 1213 1214 /* Continue with upper layer processing */ 1215 ether_demux_oncpu(ifp, m); 1216 } 1217 1218 /* 1219 * Perform certain functions of ether_input(): 1220 * - Test IFF_UP 1221 * - Update statistics 1222 * - Run bpf(4) tap if requested 1223 * Then pass the packet to ether_input_oncpu(). 1224 * 1225 * This function should be used by pseudo interface (e.g. vlan(4)), 1226 * when it tries to claim that the packet is received by it. 1227 * 1228 * REINPUT_KEEPRCVIF 1229 * REINPUT_RUNBPF 1230 */ 1231 void 1232 ether_reinput_oncpu(struct ifnet *ifp, struct mbuf *m, int reinput_flags) 1233 { 1234 /* Discard packet if interface is not up */ 1235 if (!(ifp->if_flags & IFF_UP)) { 1236 m_freem(m); 1237 return; 1238 } 1239 1240 /* 1241 * Change receiving interface. The bridge will often pass a flag to 1242 * ask that this not be done so ARPs get applied to the correct 1243 * side. 1244 */ 1245 if ((reinput_flags & REINPUT_KEEPRCVIF) == 0 || 1246 m->m_pkthdr.rcvif == NULL) { 1247 m->m_pkthdr.rcvif = ifp; 1248 } 1249 1250 /* Update statistics */ 1251 IFNET_STAT_INC(ifp, ipackets, 1); 1252 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 1253 if (m->m_flags & (M_MCAST | M_BCAST)) 1254 IFNET_STAT_INC(ifp, imcasts, 1); 1255 1256 if (reinput_flags & REINPUT_RUNBPF) 1257 BPF_MTAP(ifp, m); 1258 1259 ether_input_oncpu(ifp, m); 1260 } 1261 1262 static __inline boolean_t 1263 ether_vlancheck(struct mbuf **m0) 1264 { 1265 struct mbuf *m = *m0; 1266 struct ether_header *eh; 1267 uint16_t ether_type; 1268 1269 eh = mtod(m, struct ether_header *); 1270 ether_type = ntohs(eh->ether_type); 1271 1272 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG) == 0) { 1273 /* 1274 * Extract vlan tag if hardware does not do it for us 1275 */ 1276 vlan_ether_decap(&m); 1277 if (m == NULL) 1278 goto failed; 1279 1280 eh = mtod(m, struct ether_header *); 1281 ether_type = ntohs(eh->ether_type); 1282 } 1283 1284 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG)) { 1285 /* 1286 * To prevent possible dangerous recursion, 1287 * we don't do vlan-in-vlan 1288 */ 1289 IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1); 1290 goto failed; 1291 } 1292 KKASSERT(ether_type != ETHERTYPE_VLAN); 1293 1294 m->m_flags |= M_ETHER_VLANCHECKED; 1295 *m0 = m; 1296 return TRUE; 1297 failed: 1298 if (m != NULL) 1299 m_freem(m); 1300 *m0 = NULL; 1301 return FALSE; 1302 } 1303 1304 static void 1305 ether_input_handler(netmsg_t nmsg) 1306 { 1307 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1308 struct ether_header *eh; 1309 struct ifnet *ifp; 1310 struct mbuf *m; 1311 1312 m = nmp->nm_packet; 1313 M_ASSERTPKTHDR(m); 1314 1315 if ((m->m_flags & M_ETHER_VLANCHECKED) == 0) { 1316 if (!ether_vlancheck(&m)) { 1317 KKASSERT(m == NULL); 1318 return; 1319 } 1320 } 1321 if ((m->m_flags & (M_HASH | M_CKHASH)) == (M_HASH | M_CKHASH) || 1322 __predict_false(ether_input_ckhash)) { 1323 int isr; 1324 1325 /* 1326 * Need to verify the hash supplied by the hardware 1327 * which could be wrong. 1328 */ 1329 m->m_flags &= ~(M_HASH | M_CKHASH); 1330 isr = ether_characterize(&m); 1331 if (m == NULL) 1332 return; 1333 KKASSERT(m->m_flags & M_HASH); 1334 1335 if (netisr_hashcpu(m->m_pkthdr.hash) != mycpuid) { 1336 /* 1337 * Wrong hardware supplied hash; redispatch 1338 */ 1339 ether_dispatch(isr, m, -1); 1340 if (__predict_false(ether_input_ckhash)) 1341 atomic_add_long(ðer_input_wronghwhash, 1); 1342 return; 1343 } 1344 } 1345 ifp = m->m_pkthdr.rcvif; 1346 1347 eh = mtod(m, struct ether_header *); 1348 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1349 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1350 ifp->if_addrlen) == 0) 1351 m->m_flags |= M_BCAST; 1352 else 1353 m->m_flags |= M_MCAST; 1354 IFNET_STAT_INC(ifp, imcasts, 1); 1355 } 1356 1357 ether_input_oncpu(ifp, m); 1358 } 1359 1360 /* 1361 * Send the packet to the target netisr msgport 1362 * 1363 * At this point the packet must be characterized (M_HASH set), 1364 * so we know which netisr to send it to. 1365 */ 1366 static void 1367 ether_dispatch(int isr, struct mbuf *m, int cpuid) 1368 { 1369 struct netmsg_packet *pmsg; 1370 int target_cpuid; 1371 1372 KKASSERT(m->m_flags & M_HASH); 1373 target_cpuid = netisr_hashcpu(m->m_pkthdr.hash); 1374 1375 pmsg = &m->m_hdr.mh_netmsg; 1376 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 1377 0, ether_input_handler); 1378 pmsg->nm_packet = m; 1379 pmsg->base.lmsg.u.ms_result = isr; 1380 1381 logether(disp_beg, NULL); 1382 if (target_cpuid == cpuid) { 1383 lwkt_sendmsg_oncpu(netisr_cpuport(target_cpuid), 1384 &pmsg->base.lmsg); 1385 } else { 1386 lwkt_sendmsg(netisr_cpuport(target_cpuid), 1387 &pmsg->base.lmsg); 1388 } 1389 logether(disp_end, NULL); 1390 } 1391 1392 /* 1393 * Process a received Ethernet packet. 1394 * 1395 * The ethernet header is assumed to be in the mbuf so the caller 1396 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1397 * bytes in the first mbuf. 1398 * 1399 * If the caller knows that the current thread is stick to the current 1400 * cpu, e.g. the interrupt thread or the netisr thread, the current cpuid 1401 * (mycpuid) should be passed through 'cpuid' argument. Else -1 should 1402 * be passed as 'cpuid' argument. 1403 */ 1404 void 1405 ether_input(struct ifnet *ifp, struct mbuf *m, const struct pktinfo *pi, 1406 int cpuid) 1407 { 1408 int isr; 1409 1410 M_ASSERTPKTHDR(m); 1411 1412 /* Discard packet if interface is not up */ 1413 if (!(ifp->if_flags & IFF_UP)) { 1414 m_freem(m); 1415 return; 1416 } 1417 1418 if (m->m_len < sizeof(struct ether_header)) { 1419 /* XXX error in the caller. */ 1420 m_freem(m); 1421 return; 1422 } 1423 1424 m->m_pkthdr.rcvif = ifp; 1425 1426 logether(pkt_beg, ifp); 1427 1428 ETHER_BPF_MTAP(ifp, m); 1429 1430 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 1431 1432 if (ifp->if_flags & IFF_MONITOR) { 1433 struct ether_header *eh; 1434 1435 eh = mtod(m, struct ether_header *); 1436 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1437 IFNET_STAT_INC(ifp, imcasts, 1); 1438 1439 /* 1440 * Interface marked for monitoring; discard packet. 1441 */ 1442 m_freem(m); 1443 1444 logether(pkt_end, ifp); 1445 return; 1446 } 1447 1448 /* 1449 * If the packet has been characterized (pi->pi_netisr / M_HASH) 1450 * we can dispatch it immediately with trivial checks. 1451 */ 1452 if (pi != NULL && (m->m_flags & M_HASH)) { 1453 #ifdef RSS_DEBUG 1454 atomic_add_long(ðer_pktinfo_try, 1); 1455 #endif 1456 netisr_hashcheck(pi->pi_netisr, m, pi); 1457 if (m->m_flags & M_HASH) { 1458 ether_dispatch(pi->pi_netisr, m, cpuid); 1459 #ifdef RSS_DEBUG 1460 atomic_add_long(ðer_pktinfo_hit, 1); 1461 #endif 1462 logether(pkt_end, ifp); 1463 return; 1464 } 1465 } 1466 #ifdef RSS_DEBUG 1467 else if (ifp->if_capenable & IFCAP_RSS) { 1468 if (pi == NULL) 1469 atomic_add_long(ðer_rss_nopi, 1); 1470 else 1471 atomic_add_long(ðer_rss_nohash, 1); 1472 } 1473 #endif 1474 1475 /* 1476 * Packet hash will be recalculated by software, so clear 1477 * the M_HASH and M_CKHASH flag set by the driver; the hash 1478 * value calculated by the hardware may not be exactly what 1479 * we want. 1480 */ 1481 m->m_flags &= ~(M_HASH | M_CKHASH); 1482 1483 if (!ether_vlancheck(&m)) { 1484 KKASSERT(m == NULL); 1485 logether(pkt_end, ifp); 1486 return; 1487 } 1488 1489 isr = ether_characterize(&m); 1490 if (m == NULL) { 1491 logether(pkt_end, ifp); 1492 return; 1493 } 1494 1495 /* 1496 * Finally dispatch it 1497 */ 1498 ether_dispatch(isr, m, cpuid); 1499 1500 logether(pkt_end, ifp); 1501 } 1502 1503 static int 1504 ether_characterize(struct mbuf **m0) 1505 { 1506 struct mbuf *m = *m0; 1507 struct ether_header *eh; 1508 uint16_t ether_type; 1509 int isr; 1510 1511 eh = mtod(m, struct ether_header *); 1512 ether_type = ntohs(eh->ether_type); 1513 1514 /* 1515 * Map ether type to netisr id. 1516 */ 1517 switch (ether_type) { 1518 #ifdef INET 1519 case ETHERTYPE_IP: 1520 isr = NETISR_IP; 1521 break; 1522 1523 case ETHERTYPE_ARP: 1524 isr = NETISR_ARP; 1525 break; 1526 #endif 1527 1528 #ifdef INET6 1529 case ETHERTYPE_IPV6: 1530 isr = NETISR_IPV6; 1531 break; 1532 #endif 1533 1534 #ifdef MPLS 1535 case ETHERTYPE_MPLS: 1536 case ETHERTYPE_MPLS_MCAST: 1537 m->m_flags |= M_MPLSLABELED; 1538 isr = NETISR_MPLS; 1539 break; 1540 #endif 1541 1542 default: 1543 /* 1544 * NETISR_MAX is an invalid value; it is chosen to let 1545 * netisr_characterize() know that we have no clear 1546 * idea where this packet should go. 1547 */ 1548 isr = NETISR_MAX; 1549 break; 1550 } 1551 1552 /* 1553 * Ask the isr to characterize the packet since we couldn't. 1554 * This is an attempt to optimally get us onto the correct protocol 1555 * thread. 1556 */ 1557 netisr_characterize(isr, &m, sizeof(struct ether_header)); 1558 1559 *m0 = m; 1560 return isr; 1561 } 1562 1563 static void 1564 ether_demux_handler(netmsg_t nmsg) 1565 { 1566 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1567 struct ifnet *ifp; 1568 struct mbuf *m; 1569 1570 m = nmp->nm_packet; 1571 M_ASSERTPKTHDR(m); 1572 ifp = m->m_pkthdr.rcvif; 1573 1574 ether_demux_oncpu(ifp, m); 1575 } 1576 1577 void 1578 ether_demux(struct mbuf *m) 1579 { 1580 struct netmsg_packet *pmsg; 1581 int isr; 1582 1583 isr = ether_characterize(&m); 1584 if (m == NULL) 1585 return; 1586 1587 KKASSERT(m->m_flags & M_HASH); 1588 pmsg = &m->m_hdr.mh_netmsg; 1589 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 1590 0, ether_demux_handler); 1591 pmsg->nm_packet = m; 1592 pmsg->base.lmsg.u.ms_result = isr; 1593 1594 lwkt_sendmsg(netisr_hashport(m->m_pkthdr.hash), &pmsg->base.lmsg); 1595 } 1596 1597 u_char * 1598 kether_aton(const char *macstr, u_char *addr) 1599 { 1600 unsigned int o0, o1, o2, o3, o4, o5; 1601 int n; 1602 1603 if (macstr == NULL || addr == NULL) 1604 return NULL; 1605 1606 n = ksscanf(macstr, "%x:%x:%x:%x:%x:%x", &o0, &o1, &o2, 1607 &o3, &o4, &o5); 1608 if (n != 6) 1609 return NULL; 1610 1611 addr[0] = o0; 1612 addr[1] = o1; 1613 addr[2] = o2; 1614 addr[3] = o3; 1615 addr[4] = o4; 1616 addr[5] = o5; 1617 1618 return addr; 1619 } 1620 1621 char * 1622 kether_ntoa(const u_char *addr, char *buf) 1623 { 1624 int len = ETHER_ADDRSTRLEN + 1; 1625 int n; 1626 1627 n = ksnprintf(buf, len, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], 1628 addr[1], addr[2], addr[3], addr[4], addr[5]); 1629 1630 if (n < 17) 1631 return NULL; 1632 1633 return buf; 1634 } 1635 1636 MODULE_VERSION(ether, 1); 1637