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/vlan/if_vlan_var.h> 73 #include <net/netmsg2.h> 74 #include <net/netisr2.h> 75 76 #if defined(INET) || defined(INET6) 77 #include <netinet/in.h> 78 #include <netinet/ip_var.h> 79 #include <netinet/tcp_var.h> 80 #include <netinet/if_ether.h> 81 #include <netinet/ip_flow.h> 82 #include <net/ipfw/ip_fw.h> 83 #include <net/dummynet/ip_dummynet.h> 84 #endif 85 #ifdef INET6 86 #include <netinet6/nd6.h> 87 #endif 88 89 #ifdef CARP 90 #include <netinet/ip_carp.h> 91 #endif 92 93 #ifdef IPX 94 #include <netproto/ipx/ipx.h> 95 #include <netproto/ipx/ipx_if.h> 96 int (*ef_inputp)(struct ifnet*, const struct ether_header *eh, struct mbuf *m); 97 int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, 98 short *tp, int *hlen); 99 #endif 100 101 #ifdef MPLS 102 #include <netproto/mpls/mpls.h> 103 #endif 104 105 /* netgraph node hooks for ng_ether(4) */ 106 void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp); 107 void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m); 108 int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp); 109 void (*ng_ether_attach_p)(struct ifnet *ifp); 110 void (*ng_ether_detach_p)(struct ifnet *ifp); 111 112 void (*vlan_input_p)(struct mbuf *); 113 114 static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *, 115 struct rtentry *); 116 static void ether_restore_header(struct mbuf **, const struct ether_header *, 117 const struct ether_header *); 118 static int ether_characterize(struct mbuf **); 119 static void ether_dispatch(int, struct mbuf *); 120 121 /* 122 * if_bridge support 123 */ 124 struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *); 125 int (*bridge_output_p)(struct ifnet *, struct mbuf *); 126 void (*bridge_dn_p)(struct mbuf *, struct ifnet *); 127 struct ifnet *(*bridge_interface_p)(void *if_bridge); 128 129 static int ether_resolvemulti(struct ifnet *, struct sockaddr **, 130 struct sockaddr *); 131 132 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = { 133 0xff, 0xff, 0xff, 0xff, 0xff, 0xff 134 }; 135 136 #define gotoerr(e) do { error = (e); goto bad; } while (0) 137 #define IFP2AC(ifp) ((struct arpcom *)(ifp)) 138 139 static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, 140 struct ip_fw **rule, 141 const struct ether_header *eh); 142 143 static int ether_ipfw; 144 static u_long ether_restore_hdr; 145 static u_long ether_prepend_hdr; 146 static u_long ether_input_wronghash; 147 static int ether_debug; 148 149 #ifdef RSS_DEBUG 150 static u_long ether_pktinfo_try; 151 static u_long ether_pktinfo_hit; 152 static u_long ether_rss_nopi; 153 static u_long ether_rss_nohash; 154 static u_long ether_input_requeue; 155 #endif 156 static u_long ether_input_wronghwhash; 157 static int ether_input_ckhash; 158 159 #define ETHER_TSOLEN_DEFAULT (4 * ETHERMTU) 160 161 static int ether_tsolen_default = ETHER_TSOLEN_DEFAULT; 162 TUNABLE_INT("net.link.ether.tsolen", ðer_tsolen_default); 163 164 SYSCTL_DECL(_net_link); 165 SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); 166 SYSCTL_INT(_net_link_ether, OID_AUTO, debug, CTLFLAG_RW, 167 ðer_debug, 0, "Ether debug"); 168 SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW, 169 ðer_ipfw, 0, "Pass ether pkts through firewall"); 170 SYSCTL_ULONG(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW, 171 ðer_restore_hdr, 0, "# of ether header restoration"); 172 SYSCTL_ULONG(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW, 173 ðer_prepend_hdr, 0, 174 "# of ether header restoration which prepends mbuf"); 175 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghash, CTLFLAG_RW, 176 ðer_input_wronghash, 0, "# of input packets with wrong hash"); 177 SYSCTL_INT(_net_link_ether, OID_AUTO, tsolen, CTLFLAG_RW, 178 ðer_tsolen_default, 0, "Default max TSO length"); 179 180 #ifdef RSS_DEBUG 181 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nopi, CTLFLAG_RW, 182 ðer_rss_nopi, 0, "# of packets do not have pktinfo"); 183 SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nohash, CTLFLAG_RW, 184 ðer_rss_nohash, 0, "# of packets do not have hash"); 185 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_try, CTLFLAG_RW, 186 ðer_pktinfo_try, 0, 187 "# of tries to find packets' msgport using pktinfo"); 188 SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_hit, CTLFLAG_RW, 189 ðer_pktinfo_hit, 0, 190 "# of packets whose msgport are found using pktinfo"); 191 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_requeue, CTLFLAG_RW, 192 ðer_input_requeue, 0, "# of input packets gets requeued"); 193 #endif 194 SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghwhash, CTLFLAG_RW, 195 ðer_input_wronghwhash, 0, "# of input packets with wrong hw hash"); 196 SYSCTL_INT(_net_link_ether, OID_AUTO, always_ckhash, CTLFLAG_RW, 197 ðer_input_ckhash, 0, "always check hash"); 198 199 #define ETHER_KTR_STR "ifp=%p" 200 #define ETHER_KTR_ARGS struct ifnet *ifp 201 #ifndef KTR_ETHERNET 202 #define KTR_ETHERNET KTR_ALL 203 #endif 204 KTR_INFO_MASTER(ether); 205 KTR_INFO(KTR_ETHERNET, ether, pkt_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARGS); 206 KTR_INFO(KTR_ETHERNET, ether, pkt_end, 1, ETHER_KTR_STR, ETHER_KTR_ARGS); 207 KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARGS); 208 KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARGS); 209 #define logether(name, arg) KTR_LOG(ether_ ## name, arg) 210 211 /* 212 * Ethernet output routine. 213 * Encapsulate a packet of type family for the local net. 214 * Use trailer local net encapsulation if enough data in first 215 * packet leaves a multiple of 512 bytes of data in remainder. 216 * Assumes that ifp is actually pointer to arpcom structure. 217 */ 218 static int 219 ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 220 struct rtentry *rt) 221 { 222 struct ether_header *eh, *deh; 223 u_char *edst; 224 int loop_copy = 0; 225 int hlen = ETHER_HDR_LEN; /* link layer header length */ 226 struct arpcom *ac = IFP2AC(ifp); 227 int error; 228 229 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 230 231 if (ifp->if_flags & IFF_MONITOR) 232 gotoerr(ENETDOWN); 233 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) 234 gotoerr(ENETDOWN); 235 236 M_PREPEND(m, sizeof(struct ether_header), MB_DONTWAIT); 237 if (m == NULL) 238 return (ENOBUFS); 239 m->m_pkthdr.csum_lhlen = sizeof(struct ether_header); 240 eh = mtod(m, struct ether_header *); 241 edst = eh->ether_dhost; 242 243 /* 244 * Fill in the destination ethernet address and frame type. 245 */ 246 switch (dst->sa_family) { 247 #ifdef INET 248 case AF_INET: 249 if (!arpresolve(ifp, rt, m, dst, edst)) 250 return (0); /* if not yet resolved */ 251 #ifdef MPLS 252 if (m->m_flags & M_MPLSLABELED) 253 eh->ether_type = htons(ETHERTYPE_MPLS); 254 else 255 #endif 256 eh->ether_type = htons(ETHERTYPE_IP); 257 break; 258 #endif 259 #ifdef INET6 260 case AF_INET6: 261 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst)) 262 return (0); /* Something bad happenned. */ 263 eh->ether_type = htons(ETHERTYPE_IPV6); 264 break; 265 #endif 266 #ifdef IPX 267 case AF_IPX: 268 if (ef_outputp != NULL) { 269 /* 270 * Hold BGL and recheck ef_outputp 271 */ 272 get_mplock(); 273 if (ef_outputp != NULL) { 274 error = ef_outputp(ifp, &m, dst, 275 &eh->ether_type, &hlen); 276 rel_mplock(); 277 if (error) 278 goto bad; 279 else 280 break; 281 } 282 rel_mplock(); 283 } 284 eh->ether_type = htons(ETHERTYPE_IPX); 285 bcopy(&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), 286 edst, ETHER_ADDR_LEN); 287 break; 288 #endif 289 case pseudo_AF_HDRCMPLT: 290 case AF_UNSPEC: 291 loop_copy = -1; /* if this is for us, don't do it */ 292 deh = (struct ether_header *)dst->sa_data; 293 memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN); 294 eh->ether_type = deh->ether_type; 295 break; 296 297 default: 298 if_printf(ifp, "can't handle af%d\n", dst->sa_family); 299 gotoerr(EAFNOSUPPORT); 300 } 301 302 if (dst->sa_family == pseudo_AF_HDRCMPLT) /* unlikely */ 303 memcpy(eh->ether_shost, 304 ((struct ether_header *)dst->sa_data)->ether_shost, 305 ETHER_ADDR_LEN); 306 else 307 memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN); 308 309 /* 310 * Bridges require special output handling. 311 */ 312 if (ifp->if_bridge) { 313 KASSERT(bridge_output_p != NULL, 314 ("%s: if_bridge not loaded!", __func__)); 315 return bridge_output_p(ifp, m); 316 } 317 318 /* 319 * If a simplex interface, and the packet is being sent to our 320 * Ethernet address or a broadcast address, loopback a copy. 321 * XXX To make a simplex device behave exactly like a duplex 322 * device, we should copy in the case of sending to our own 323 * ethernet address (thus letting the original actually appear 324 * on the wire). However, we don't do that here for security 325 * reasons and compatibility with the original behavior. 326 */ 327 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { 328 int csum_flags = 0; 329 330 if (m->m_pkthdr.csum_flags & CSUM_IP) 331 csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 332 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) 333 csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR); 334 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 335 struct mbuf *n; 336 337 if ((n = m_copypacket(m, MB_DONTWAIT)) != NULL) { 338 n->m_pkthdr.csum_flags |= csum_flags; 339 if (csum_flags & CSUM_DATA_VALID) 340 n->m_pkthdr.csum_data = 0xffff; 341 if_simloop(ifp, n, dst->sa_family, hlen); 342 } else 343 IFNET_STAT_INC(ifp, iqdrops, 1); 344 } else if (bcmp(eh->ether_dhost, eh->ether_shost, 345 ETHER_ADDR_LEN) == 0) { 346 m->m_pkthdr.csum_flags |= csum_flags; 347 if (csum_flags & CSUM_DATA_VALID) 348 m->m_pkthdr.csum_data = 0xffff; 349 if_simloop(ifp, m, dst->sa_family, hlen); 350 return (0); /* XXX */ 351 } 352 } 353 354 #ifdef CARP 355 if (ifp->if_type == IFT_CARP) { 356 ifp = carp_parent(ifp); 357 if (ifp == NULL) 358 gotoerr(ENETUNREACH); 359 360 ac = IFP2AC(ifp); 361 362 /* 363 * Check precondition again 364 */ 365 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 366 367 if (ifp->if_flags & IFF_MONITOR) 368 gotoerr(ENETDOWN); 369 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != 370 (IFF_UP | IFF_RUNNING)) 371 gotoerr(ENETDOWN); 372 } 373 #endif 374 375 /* Handle ng_ether(4) processing, if any */ 376 if (ng_ether_output_p != NULL) { 377 /* 378 * Hold BGL and recheck ng_ether_output_p 379 */ 380 get_mplock(); 381 if (ng_ether_output_p != NULL) { 382 if ((error = ng_ether_output_p(ifp, &m)) != 0) { 383 rel_mplock(); 384 goto bad; 385 } 386 if (m == NULL) { 387 rel_mplock(); 388 return (0); 389 } 390 } 391 rel_mplock(); 392 } 393 394 /* Continue with link-layer output */ 395 return ether_output_frame(ifp, m); 396 397 bad: 398 m_freem(m); 399 return (error); 400 } 401 402 /* 403 * Returns the bridge interface an ifp is associated 404 * with. 405 * 406 * Only call if ifp->if_bridge != NULL. 407 */ 408 struct ifnet * 409 ether_bridge_interface(struct ifnet *ifp) 410 { 411 if (bridge_interface_p) 412 return(bridge_interface_p(ifp->if_bridge)); 413 return (ifp); 414 } 415 416 /* 417 * Ethernet link layer output routine to send a raw frame to the device. 418 * 419 * This assumes that the 14 byte Ethernet header is present and contiguous 420 * in the first mbuf. 421 */ 422 int 423 ether_output_frame(struct ifnet *ifp, struct mbuf *m) 424 { 425 struct ip_fw *rule = NULL; 426 int error = 0; 427 struct altq_pktattr pktattr; 428 429 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 430 431 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 432 struct m_tag *mtag; 433 434 /* Extract info from dummynet tag */ 435 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 436 KKASSERT(mtag != NULL); 437 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 438 KKASSERT(rule != NULL); 439 440 m_tag_delete(m, mtag); 441 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 442 } 443 444 if (ifq_is_enabled(&ifp->if_snd)) 445 altq_etherclassify(&ifp->if_snd, m, &pktattr); 446 crit_enter(); 447 if (IPFW_LOADED && ether_ipfw != 0) { 448 struct ether_header save_eh, *eh; 449 450 eh = mtod(m, struct ether_header *); 451 save_eh = *eh; 452 m_adj(m, ETHER_HDR_LEN); 453 if (!ether_ipfw_chk(&m, ifp, &rule, eh)) { 454 crit_exit(); 455 if (m != NULL) { 456 m_freem(m); 457 return ENOBUFS; /* pkt dropped */ 458 } else 459 return 0; /* consumed e.g. in a pipe */ 460 } 461 462 /* packet was ok, restore the ethernet header */ 463 ether_restore_header(&m, eh, &save_eh); 464 if (m == NULL) { 465 crit_exit(); 466 return ENOBUFS; 467 } 468 } 469 crit_exit(); 470 471 /* 472 * Queue message on interface, update output statistics if 473 * successful, and start output if interface not yet active. 474 */ 475 error = ifq_dispatch(ifp, m, &pktattr); 476 return (error); 477 } 478 479 /* 480 * ipfw processing for ethernet packets (in and out). 481 * The second parameter is NULL from ether_demux(), and ifp from 482 * ether_output_frame(). 483 */ 484 static boolean_t 485 ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule, 486 const struct ether_header *eh) 487 { 488 struct ether_header save_eh = *eh; /* might be a ptr in *m0 */ 489 struct ip_fw_args args; 490 struct m_tag *mtag; 491 struct mbuf *m; 492 int i; 493 494 if (*rule != NULL && fw_one_pass) 495 return TRUE; /* dummynet packet, already partially processed */ 496 497 /* 498 * I need some amount of data to be contiguous. 499 */ 500 i = min((*m0)->m_pkthdr.len, max_protohdr); 501 if ((*m0)->m_len < i) { 502 *m0 = m_pullup(*m0, i); 503 if (*m0 == NULL) 504 return FALSE; 505 } 506 507 /* 508 * Clean up tags 509 */ 510 if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) 511 m_tag_delete(*m0, mtag); 512 if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) { 513 mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL); 514 KKASSERT(mtag != NULL); 515 m_tag_delete(*m0, mtag); 516 (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED; 517 } 518 519 args.m = *m0; /* the packet we are looking at */ 520 args.oif = dst; /* destination, if any */ 521 args.rule = *rule; /* matching rule to restart */ 522 args.eh = &save_eh; /* MAC header for bridged/MAC packets */ 523 i = ip_fw_chk_ptr(&args); 524 *m0 = args.m; 525 *rule = args.rule; 526 527 if (*m0 == NULL) 528 return FALSE; 529 530 switch (i) { 531 case IP_FW_PASS: 532 return TRUE; 533 534 case IP_FW_DIVERT: 535 case IP_FW_TEE: 536 case IP_FW_DENY: 537 /* 538 * XXX at some point add support for divert/forward actions. 539 * If none of the above matches, we have to drop the pkt. 540 */ 541 return FALSE; 542 543 case IP_FW_DUMMYNET: 544 /* 545 * Pass the pkt to dummynet, which consumes it. 546 */ 547 m = *m0; /* pass the original to dummynet */ 548 *m0 = NULL; /* and nothing back to the caller */ 549 550 ether_restore_header(&m, eh, &save_eh); 551 if (m == NULL) 552 return FALSE; 553 554 ip_fw_dn_io_ptr(m, args.cookie, 555 dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args); 556 ip_dn_queue(m); 557 return FALSE; 558 559 default: 560 panic("unknown ipfw return value: %d", i); 561 } 562 } 563 564 static void 565 ether_input(struct ifnet *ifp, struct mbuf *m) 566 { 567 ether_input_pkt(ifp, m, NULL); 568 } 569 570 /* 571 * Perform common duties while attaching to interface list 572 */ 573 void 574 ether_ifattach(struct ifnet *ifp, uint8_t *lla, lwkt_serialize_t serializer) 575 { 576 ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header), 577 serializer); 578 } 579 580 void 581 ether_ifattach_bpf(struct ifnet *ifp, uint8_t *lla, u_int dlt, u_int hdrlen, 582 lwkt_serialize_t serializer) 583 { 584 struct sockaddr_dl *sdl; 585 char ethstr[ETHER_ADDRSTRLEN + 1]; 586 587 ifp->if_type = IFT_ETHER; 588 ifp->if_addrlen = ETHER_ADDR_LEN; 589 ifp->if_hdrlen = ETHER_HDR_LEN; 590 if_attach(ifp, serializer); 591 ifp->if_mtu = ETHERMTU; 592 if (ifp->if_tsolen <= 0) { 593 if ((ether_tsolen_default / ETHERMTU) < 2) { 594 kprintf("ether TSO maxlen %d -> %d\n", 595 ether_tsolen_default, ETHER_TSOLEN_DEFAULT); 596 ether_tsolen_default = ETHER_TSOLEN_DEFAULT; 597 } 598 ifp->if_tsolen = ether_tsolen_default; 599 } 600 if (ifp->if_baudrate == 0) 601 ifp->if_baudrate = 10000000; 602 ifp->if_output = ether_output; 603 ifp->if_input = ether_input; 604 ifp->if_resolvemulti = ether_resolvemulti; 605 ifp->if_broadcastaddr = etherbroadcastaddr; 606 sdl = IF_LLSOCKADDR(ifp); 607 sdl->sdl_type = IFT_ETHER; 608 sdl->sdl_alen = ifp->if_addrlen; 609 bcopy(lla, LLADDR(sdl), ifp->if_addrlen); 610 /* 611 * XXX Keep the current drivers happy. 612 * XXX Remove once all drivers have been cleaned up 613 */ 614 if (lla != IFP2AC(ifp)->ac_enaddr) 615 bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen); 616 bpfattach(ifp, dlt, hdrlen); 617 if (ng_ether_attach_p != NULL) 618 (*ng_ether_attach_p)(ifp); 619 620 if_printf(ifp, "MAC address: %s\n", kether_ntoa(lla, ethstr)); 621 } 622 623 /* 624 * Perform common duties while detaching an Ethernet interface 625 */ 626 void 627 ether_ifdetach(struct ifnet *ifp) 628 { 629 if_down(ifp); 630 631 if (ng_ether_detach_p != NULL) 632 (*ng_ether_detach_p)(ifp); 633 bpfdetach(ifp); 634 if_detach(ifp); 635 } 636 637 int 638 ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 639 { 640 struct ifaddr *ifa = (struct ifaddr *) data; 641 struct ifreq *ifr = (struct ifreq *) data; 642 int error = 0; 643 644 #define IF_INIT(ifp) \ 645 do { \ 646 if (((ifp)->if_flags & IFF_UP) == 0) { \ 647 (ifp)->if_flags |= IFF_UP; \ 648 (ifp)->if_init((ifp)->if_softc); \ 649 } \ 650 } while (0) 651 652 ASSERT_IFNET_SERIALIZED_ALL(ifp); 653 654 switch (command) { 655 case SIOCSIFADDR: 656 switch (ifa->ifa_addr->sa_family) { 657 #ifdef INET 658 case AF_INET: 659 IF_INIT(ifp); /* before arpwhohas */ 660 arp_ifinit(ifp, ifa); 661 break; 662 #endif 663 #ifdef IPX 664 /* 665 * XXX - This code is probably wrong 666 */ 667 case AF_IPX: 668 { 669 struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr; 670 struct arpcom *ac = IFP2AC(ifp); 671 672 if (ipx_nullhost(*ina)) 673 ina->x_host = *(union ipx_host *) ac->ac_enaddr; 674 else 675 bcopy(ina->x_host.c_host, ac->ac_enaddr, 676 sizeof ac->ac_enaddr); 677 678 IF_INIT(ifp); /* Set new address. */ 679 break; 680 } 681 #endif 682 default: 683 IF_INIT(ifp); 684 break; 685 } 686 break; 687 688 case SIOCGIFADDR: 689 bcopy(IFP2AC(ifp)->ac_enaddr, 690 ((struct sockaddr *)ifr->ifr_data)->sa_data, 691 ETHER_ADDR_LEN); 692 break; 693 694 case SIOCSIFMTU: 695 /* 696 * Set the interface MTU. 697 */ 698 if (ifr->ifr_mtu > ETHERMTU) { 699 error = EINVAL; 700 } else { 701 ifp->if_mtu = ifr->ifr_mtu; 702 } 703 break; 704 default: 705 error = EINVAL; 706 break; 707 } 708 return (error); 709 710 #undef IF_INIT 711 } 712 713 int 714 ether_resolvemulti( 715 struct ifnet *ifp, 716 struct sockaddr **llsa, 717 struct sockaddr *sa) 718 { 719 struct sockaddr_dl *sdl; 720 #ifdef INET 721 struct sockaddr_in *sin; 722 #endif 723 #ifdef INET6 724 struct sockaddr_in6 *sin6; 725 #endif 726 u_char *e_addr; 727 728 switch(sa->sa_family) { 729 case AF_LINK: 730 /* 731 * No mapping needed. Just check that it's a valid MC address. 732 */ 733 sdl = (struct sockaddr_dl *)sa; 734 e_addr = LLADDR(sdl); 735 if ((e_addr[0] & 1) != 1) 736 return EADDRNOTAVAIL; 737 *llsa = NULL; 738 return 0; 739 740 #ifdef INET 741 case AF_INET: 742 sin = (struct sockaddr_in *)sa; 743 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) 744 return EADDRNOTAVAIL; 745 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 746 sdl->sdl_len = sizeof *sdl; 747 sdl->sdl_family = AF_LINK; 748 sdl->sdl_index = ifp->if_index; 749 sdl->sdl_type = IFT_ETHER; 750 sdl->sdl_alen = ETHER_ADDR_LEN; 751 e_addr = LLADDR(sdl); 752 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); 753 *llsa = (struct sockaddr *)sdl; 754 return 0; 755 #endif 756 #ifdef INET6 757 case AF_INET6: 758 sin6 = (struct sockaddr_in6 *)sa; 759 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 760 /* 761 * An IP6 address of 0 means listen to all 762 * of the Ethernet multicast address used for IP6. 763 * (This is used for multicast routers.) 764 */ 765 ifp->if_flags |= IFF_ALLMULTI; 766 *llsa = NULL; 767 return 0; 768 } 769 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 770 return EADDRNOTAVAIL; 771 sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO); 772 sdl->sdl_len = sizeof *sdl; 773 sdl->sdl_family = AF_LINK; 774 sdl->sdl_index = ifp->if_index; 775 sdl->sdl_type = IFT_ETHER; 776 sdl->sdl_alen = ETHER_ADDR_LEN; 777 e_addr = LLADDR(sdl); 778 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); 779 *llsa = (struct sockaddr *)sdl; 780 return 0; 781 #endif 782 783 default: 784 /* 785 * Well, the text isn't quite right, but it's the name 786 * that counts... 787 */ 788 return EAFNOSUPPORT; 789 } 790 } 791 792 #if 0 793 /* 794 * This is for reference. We have a table-driven version 795 * of the little-endian crc32 generator, which is faster 796 * than the double-loop. 797 */ 798 uint32_t 799 ether_crc32_le(const uint8_t *buf, size_t len) 800 { 801 uint32_t c, crc, carry; 802 size_t i, j; 803 804 crc = 0xffffffffU; /* initial value */ 805 806 for (i = 0; i < len; i++) { 807 c = buf[i]; 808 for (j = 0; j < 8; j++) { 809 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 810 crc >>= 1; 811 c >>= 1; 812 if (carry) 813 crc = (crc ^ ETHER_CRC_POLY_LE); 814 } 815 } 816 817 return (crc); 818 } 819 #else 820 uint32_t 821 ether_crc32_le(const uint8_t *buf, size_t len) 822 { 823 static const uint32_t crctab[] = { 824 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 825 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 826 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 827 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 828 }; 829 uint32_t crc; 830 size_t i; 831 832 crc = 0xffffffffU; /* initial value */ 833 834 for (i = 0; i < len; i++) { 835 crc ^= buf[i]; 836 crc = (crc >> 4) ^ crctab[crc & 0xf]; 837 crc = (crc >> 4) ^ crctab[crc & 0xf]; 838 } 839 840 return (crc); 841 } 842 #endif 843 844 uint32_t 845 ether_crc32_be(const uint8_t *buf, size_t len) 846 { 847 uint32_t c, crc, carry; 848 size_t i, j; 849 850 crc = 0xffffffffU; /* initial value */ 851 852 for (i = 0; i < len; i++) { 853 c = buf[i]; 854 for (j = 0; j < 8; j++) { 855 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 856 crc <<= 1; 857 c >>= 1; 858 if (carry) 859 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 860 } 861 } 862 863 return (crc); 864 } 865 866 /* 867 * find the size of ethernet header, and call classifier 868 */ 869 void 870 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 871 struct altq_pktattr *pktattr) 872 { 873 struct ether_header *eh; 874 uint16_t ether_type; 875 int hlen, af, hdrsize; 876 877 hlen = sizeof(struct ether_header); 878 eh = mtod(m, struct ether_header *); 879 880 ether_type = ntohs(eh->ether_type); 881 if (ether_type < ETHERMTU) { 882 /* ick! LLC/SNAP */ 883 struct llc *llc = (struct llc *)(eh + 1); 884 hlen += 8; 885 886 if (m->m_len < hlen || 887 llc->llc_dsap != LLC_SNAP_LSAP || 888 llc->llc_ssap != LLC_SNAP_LSAP || 889 llc->llc_control != LLC_UI) 890 goto bad; /* not snap! */ 891 892 ether_type = ntohs(llc->llc_un.type_snap.ether_type); 893 } 894 895 if (ether_type == ETHERTYPE_IP) { 896 af = AF_INET; 897 hdrsize = 20; /* sizeof(struct ip) */ 898 #ifdef INET6 899 } else if (ether_type == ETHERTYPE_IPV6) { 900 af = AF_INET6; 901 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 902 #endif 903 } else 904 goto bad; 905 906 while (m->m_len <= hlen) { 907 hlen -= m->m_len; 908 m = m->m_next; 909 } 910 if (m->m_len < hlen + hdrsize) { 911 /* 912 * ip header is not in a single mbuf. this should not 913 * happen in the current code. 914 * (todo: use m_pulldown in the future) 915 */ 916 goto bad; 917 } 918 m->m_data += hlen; 919 m->m_len -= hlen; 920 ifq_classify(ifq, m, af, pktattr); 921 m->m_data -= hlen; 922 m->m_len += hlen; 923 924 return; 925 926 bad: 927 pktattr->pattr_class = NULL; 928 pktattr->pattr_hdr = NULL; 929 pktattr->pattr_af = AF_UNSPEC; 930 } 931 932 static void 933 ether_restore_header(struct mbuf **m0, const struct ether_header *eh, 934 const struct ether_header *save_eh) 935 { 936 struct mbuf *m = *m0; 937 938 ether_restore_hdr++; 939 940 /* 941 * Prepend the header, optimize for the common case of 942 * eh pointing into the mbuf. 943 */ 944 if ((const void *)(eh + 1) == (void *)m->m_data) { 945 m->m_data -= ETHER_HDR_LEN; 946 m->m_len += ETHER_HDR_LEN; 947 m->m_pkthdr.len += ETHER_HDR_LEN; 948 } else { 949 ether_prepend_hdr++; 950 951 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 952 if (m != NULL) { 953 bcopy(save_eh, mtod(m, struct ether_header *), 954 ETHER_HDR_LEN); 955 } 956 } 957 *m0 = m; 958 } 959 960 /* 961 * Upper layer processing for a received Ethernet packet. 962 */ 963 void 964 ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m) 965 { 966 struct ether_header *eh; 967 int isr, discard = 0; 968 u_short ether_type; 969 struct ip_fw *rule = NULL; 970 971 M_ASSERTPKTHDR(m); 972 KASSERT(m->m_len >= ETHER_HDR_LEN, 973 ("ether header is not contiguous!")); 974 975 eh = mtod(m, struct ether_header *); 976 977 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 978 struct m_tag *mtag; 979 980 /* Extract info from dummynet tag */ 981 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 982 KKASSERT(mtag != NULL); 983 rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 984 KKASSERT(rule != NULL); 985 986 m_tag_delete(m, mtag); 987 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 988 989 /* packet is passing the second time */ 990 goto post_stats; 991 } 992 993 /* 994 * We got a packet which was unicast to a different Ethernet 995 * address. If the driver is working properly, then this 996 * situation can only happen when the interface is in 997 * promiscuous mode. We defer the packet discarding until the 998 * vlan processing is done, so that vlan/bridge or vlan/netgraph 999 * could work. 1000 */ 1001 if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) && 1002 !ETHER_IS_MULTICAST(eh->ether_dhost) && 1003 bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) { 1004 if (ether_debug & 1) { 1005 kprintf("%02x:%02x:%02x:%02x:%02x:%02x " 1006 "%02x:%02x:%02x:%02x:%02x:%02x " 1007 "%04x vs %02x:%02x:%02x:%02x:%02x:%02x\n", 1008 eh->ether_dhost[0], 1009 eh->ether_dhost[1], 1010 eh->ether_dhost[2], 1011 eh->ether_dhost[3], 1012 eh->ether_dhost[4], 1013 eh->ether_dhost[5], 1014 eh->ether_shost[0], 1015 eh->ether_shost[1], 1016 eh->ether_shost[2], 1017 eh->ether_shost[3], 1018 eh->ether_shost[4], 1019 eh->ether_shost[5], 1020 eh->ether_type, 1021 ((u_char *)IFP2AC(ifp)->ac_enaddr)[0], 1022 ((u_char *)IFP2AC(ifp)->ac_enaddr)[1], 1023 ((u_char *)IFP2AC(ifp)->ac_enaddr)[2], 1024 ((u_char *)IFP2AC(ifp)->ac_enaddr)[3], 1025 ((u_char *)IFP2AC(ifp)->ac_enaddr)[4], 1026 ((u_char *)IFP2AC(ifp)->ac_enaddr)[5] 1027 ); 1028 } 1029 if ((ether_debug & 2) == 0) 1030 discard = 1; 1031 } 1032 1033 post_stats: 1034 if (IPFW_LOADED && ether_ipfw != 0 && !discard) { 1035 struct ether_header save_eh = *eh; 1036 1037 /* XXX old crufty stuff, needs to be removed */ 1038 m_adj(m, sizeof(struct ether_header)); 1039 1040 if (!ether_ipfw_chk(&m, NULL, &rule, eh)) { 1041 m_freem(m); 1042 return; 1043 } 1044 1045 ether_restore_header(&m, eh, &save_eh); 1046 if (m == NULL) 1047 return; 1048 eh = mtod(m, struct ether_header *); 1049 } 1050 1051 ether_type = ntohs(eh->ether_type); 1052 KKASSERT(ether_type != ETHERTYPE_VLAN); 1053 1054 if (m->m_flags & M_VLANTAG) { 1055 void (*vlan_input_func)(struct mbuf *); 1056 1057 vlan_input_func = vlan_input_p; 1058 if (vlan_input_func != NULL) { 1059 vlan_input_func(m); 1060 } else { 1061 IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1); 1062 m_freem(m); 1063 } 1064 return; 1065 } 1066 1067 /* 1068 * If we have been asked to discard this packet 1069 * (e.g. not for us), drop it before entering 1070 * the upper layer. 1071 */ 1072 if (discard) { 1073 m_freem(m); 1074 return; 1075 } 1076 1077 /* 1078 * Clear protocol specific flags, 1079 * before entering the upper layer. 1080 */ 1081 m->m_flags &= ~M_ETHER_FLAGS; 1082 1083 /* Strip ethernet header. */ 1084 m_adj(m, sizeof(struct ether_header)); 1085 1086 switch (ether_type) { 1087 #ifdef INET 1088 case ETHERTYPE_IP: 1089 if ((m->m_flags & M_LENCHECKED) == 0) { 1090 if (!ip_lengthcheck(&m, 0)) 1091 return; 1092 } 1093 if (ipflow_fastforward(m)) 1094 return; 1095 isr = NETISR_IP; 1096 break; 1097 1098 case ETHERTYPE_ARP: 1099 if (ifp->if_flags & IFF_NOARP) { 1100 /* Discard packet if ARP is disabled on interface */ 1101 m_freem(m); 1102 return; 1103 } 1104 isr = NETISR_ARP; 1105 break; 1106 #endif 1107 1108 #ifdef INET6 1109 case ETHERTYPE_IPV6: 1110 isr = NETISR_IPV6; 1111 break; 1112 #endif 1113 1114 #ifdef IPX 1115 case ETHERTYPE_IPX: 1116 if (ef_inputp) { 1117 /* 1118 * Hold BGL and recheck ef_inputp 1119 */ 1120 get_mplock(); 1121 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1122 rel_mplock(); 1123 return; 1124 } 1125 rel_mplock(); 1126 } 1127 isr = NETISR_IPX; 1128 break; 1129 #endif 1130 1131 #ifdef MPLS 1132 case ETHERTYPE_MPLS: 1133 case ETHERTYPE_MPLS_MCAST: 1134 /* Should have been set by ether_input_pkt(). */ 1135 KKASSERT(m->m_flags & M_MPLSLABELED); 1136 isr = NETISR_MPLS; 1137 break; 1138 #endif 1139 1140 default: 1141 /* 1142 * The accurate msgport is not determined before 1143 * we reach here, so recharacterize packet. 1144 */ 1145 m->m_flags &= ~M_HASH; 1146 #ifdef IPX 1147 if (ef_inputp) { 1148 /* 1149 * Hold BGL and recheck ef_inputp 1150 */ 1151 get_mplock(); 1152 if (ef_inputp && ef_inputp(ifp, eh, m) == 0) { 1153 rel_mplock(); 1154 return; 1155 } 1156 rel_mplock(); 1157 } 1158 #endif 1159 if (ng_ether_input_orphan_p != NULL) { 1160 /* 1161 * Put back the ethernet header so netgraph has a 1162 * consistent view of inbound packets. 1163 */ 1164 M_PREPEND(m, ETHER_HDR_LEN, MB_DONTWAIT); 1165 if (m == NULL) { 1166 /* 1167 * M_PREPEND frees the mbuf in case of failure. 1168 */ 1169 return; 1170 } 1171 /* 1172 * Hold BGL and recheck ng_ether_input_orphan_p 1173 */ 1174 get_mplock(); 1175 if (ng_ether_input_orphan_p != NULL) { 1176 ng_ether_input_orphan_p(ifp, m); 1177 rel_mplock(); 1178 return; 1179 } 1180 rel_mplock(); 1181 } 1182 m_freem(m); 1183 return; 1184 } 1185 1186 if (m->m_flags & M_HASH) { 1187 if (&curthread->td_msgport == 1188 netisr_hashport(m->m_pkthdr.hash)) { 1189 netisr_handle(isr, m); 1190 return; 1191 } else { 1192 /* 1193 * XXX Something is wrong, 1194 * we probably should panic here! 1195 */ 1196 m->m_flags &= ~M_HASH; 1197 atomic_add_long(ðer_input_wronghash, 1); 1198 } 1199 } 1200 #ifdef RSS_DEBUG 1201 atomic_add_long(ðer_input_requeue, 1); 1202 #endif 1203 netisr_queue(isr, m); 1204 } 1205 1206 /* 1207 * First we perform any link layer operations, then continue to the 1208 * upper layers with ether_demux_oncpu(). 1209 */ 1210 static void 1211 ether_input_oncpu(struct ifnet *ifp, struct mbuf *m) 1212 { 1213 #ifdef CARP 1214 void *carp; 1215 #endif 1216 1217 if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) { 1218 /* 1219 * Receiving interface's flags are changed, when this 1220 * packet is waiting for processing; discard it. 1221 */ 1222 m_freem(m); 1223 return; 1224 } 1225 1226 /* 1227 * Tap the packet off here for a bridge. bridge_input() 1228 * will return NULL if it has consumed the packet, otherwise 1229 * it gets processed as normal. Note that bridge_input() 1230 * will always return the original packet if we need to 1231 * process it locally. 1232 */ 1233 if (ifp->if_bridge) { 1234 KASSERT(bridge_input_p != NULL, 1235 ("%s: if_bridge not loaded!", __func__)); 1236 1237 if(m->m_flags & M_ETHER_BRIDGED) { 1238 m->m_flags &= ~M_ETHER_BRIDGED; 1239 } else { 1240 m = bridge_input_p(ifp, m); 1241 if (m == NULL) 1242 return; 1243 1244 KASSERT(ifp == m->m_pkthdr.rcvif, 1245 ("bridge_input_p changed rcvif")); 1246 } 1247 } 1248 1249 #ifdef CARP 1250 carp = ifp->if_carp; 1251 if (carp) { 1252 m = carp_input(carp, m); 1253 if (m == NULL) 1254 return; 1255 KASSERT(ifp == m->m_pkthdr.rcvif, 1256 ("carp_input changed rcvif")); 1257 } 1258 #endif 1259 1260 /* Handle ng_ether(4) processing, if any */ 1261 if (ng_ether_input_p != NULL) { 1262 /* 1263 * Hold BGL and recheck ng_ether_input_p 1264 */ 1265 get_mplock(); 1266 if (ng_ether_input_p != NULL) 1267 ng_ether_input_p(ifp, &m); 1268 rel_mplock(); 1269 1270 if (m == NULL) 1271 return; 1272 } 1273 1274 /* Continue with upper layer processing */ 1275 ether_demux_oncpu(ifp, m); 1276 } 1277 1278 /* 1279 * Perform certain functions of ether_input_pkt(): 1280 * - Test IFF_UP 1281 * - Update statistics 1282 * - Run bpf(4) tap if requested 1283 * Then pass the packet to ether_input_oncpu(). 1284 * 1285 * This function should be used by pseudo interface (e.g. vlan(4)), 1286 * when it tries to claim that the packet is received by it. 1287 * 1288 * REINPUT_KEEPRCVIF 1289 * REINPUT_RUNBPF 1290 */ 1291 void 1292 ether_reinput_oncpu(struct ifnet *ifp, struct mbuf *m, int reinput_flags) 1293 { 1294 /* Discard packet if interface is not up */ 1295 if (!(ifp->if_flags & IFF_UP)) { 1296 m_freem(m); 1297 return; 1298 } 1299 1300 /* 1301 * Change receiving interface. The bridge will often pass a flag to 1302 * ask that this not be done so ARPs get applied to the correct 1303 * side. 1304 */ 1305 if ((reinput_flags & REINPUT_KEEPRCVIF) == 0 || 1306 m->m_pkthdr.rcvif == NULL) { 1307 m->m_pkthdr.rcvif = ifp; 1308 } 1309 1310 /* Update statistics */ 1311 IFNET_STAT_INC(ifp, ipackets, 1); 1312 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 1313 if (m->m_flags & (M_MCAST | M_BCAST)) 1314 IFNET_STAT_INC(ifp, imcasts, 1); 1315 1316 if (reinput_flags & REINPUT_RUNBPF) 1317 BPF_MTAP(ifp, m); 1318 1319 ether_input_oncpu(ifp, m); 1320 } 1321 1322 static __inline boolean_t 1323 ether_vlancheck(struct mbuf **m0) 1324 { 1325 struct mbuf *m = *m0; 1326 struct ether_header *eh; 1327 uint16_t ether_type; 1328 1329 eh = mtod(m, struct ether_header *); 1330 ether_type = ntohs(eh->ether_type); 1331 1332 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG) == 0) { 1333 /* 1334 * Extract vlan tag if hardware does not do it for us 1335 */ 1336 vlan_ether_decap(&m); 1337 if (m == NULL) 1338 goto failed; 1339 1340 eh = mtod(m, struct ether_header *); 1341 ether_type = ntohs(eh->ether_type); 1342 } 1343 1344 if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG)) { 1345 /* 1346 * To prevent possible dangerous recursion, 1347 * we don't do vlan-in-vlan 1348 */ 1349 IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1); 1350 goto failed; 1351 } 1352 KKASSERT(ether_type != ETHERTYPE_VLAN); 1353 1354 m->m_flags |= M_ETHER_VLANCHECKED; 1355 *m0 = m; 1356 return TRUE; 1357 failed: 1358 if (m != NULL) 1359 m_freem(m); 1360 *m0 = NULL; 1361 return FALSE; 1362 } 1363 1364 static void 1365 ether_input_handler(netmsg_t nmsg) 1366 { 1367 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1368 struct ether_header *eh; 1369 struct ifnet *ifp; 1370 struct mbuf *m; 1371 1372 m = nmp->nm_packet; 1373 M_ASSERTPKTHDR(m); 1374 1375 if ((m->m_flags & M_ETHER_VLANCHECKED) == 0) { 1376 if (!ether_vlancheck(&m)) { 1377 KKASSERT(m == NULL); 1378 return; 1379 } 1380 } 1381 if ((m->m_flags & (M_HASH | M_CKHASH)) == (M_HASH | M_CKHASH) || 1382 __predict_false(ether_input_ckhash)) { 1383 int isr; 1384 1385 /* 1386 * Need to verify the hash supplied by the hardware 1387 * which could be wrong. 1388 */ 1389 m->m_flags &= ~(M_HASH | M_CKHASH); 1390 isr = ether_characterize(&m); 1391 if (m == NULL) 1392 return; 1393 KKASSERT(m->m_flags & M_HASH); 1394 1395 if (netisr_hashcpu(m->m_pkthdr.hash) != mycpuid) { 1396 /* 1397 * Wrong hardware supplied hash; redispatch 1398 */ 1399 ether_dispatch(isr, m); 1400 if (__predict_false(ether_input_ckhash)) 1401 atomic_add_long(ðer_input_wronghwhash, 1); 1402 return; 1403 } 1404 } 1405 ifp = m->m_pkthdr.rcvif; 1406 1407 eh = mtod(m, struct ether_header *); 1408 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1409 if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost, 1410 ifp->if_addrlen) == 0) 1411 m->m_flags |= M_BCAST; 1412 else 1413 m->m_flags |= M_MCAST; 1414 IFNET_STAT_INC(ifp, imcasts, 1); 1415 } 1416 1417 ether_input_oncpu(ifp, m); 1418 } 1419 1420 /* 1421 * Send the packet to the target msgport 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) 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 logether(disp_beg, NULL); 1439 lwkt_sendmsg(netisr_hashport(m->m_pkthdr.hash), &pmsg->base.lmsg); 1440 logether(disp_end, NULL); 1441 } 1442 1443 /* 1444 * Process a received Ethernet packet. 1445 * 1446 * The ethernet header is assumed to be in the mbuf so the caller 1447 * MUST MAKE SURE that there are at least sizeof(struct ether_header) 1448 * bytes in the first mbuf. 1449 */ 1450 void 1451 ether_input_pkt(struct ifnet *ifp, struct mbuf *m, const struct pktinfo *pi) 1452 { 1453 int isr; 1454 1455 M_ASSERTPKTHDR(m); 1456 1457 /* Discard packet if interface is not up */ 1458 if (!(ifp->if_flags & IFF_UP)) { 1459 m_freem(m); 1460 return; 1461 } 1462 1463 if (m->m_len < sizeof(struct ether_header)) { 1464 /* XXX error in the caller. */ 1465 m_freem(m); 1466 return; 1467 } 1468 1469 m->m_pkthdr.rcvif = ifp; 1470 1471 logether(pkt_beg, ifp); 1472 1473 ETHER_BPF_MTAP(ifp, m); 1474 1475 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len); 1476 1477 if (ifp->if_flags & IFF_MONITOR) { 1478 struct ether_header *eh; 1479 1480 eh = mtod(m, struct ether_header *); 1481 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1482 IFNET_STAT_INC(ifp, imcasts, 1); 1483 1484 /* 1485 * Interface marked for monitoring; discard packet. 1486 */ 1487 m_freem(m); 1488 1489 logether(pkt_end, ifp); 1490 return; 1491 } 1492 1493 /* 1494 * If the packet has been characterized (pi->pi_netisr / M_HASH) 1495 * we can dispatch it immediately without further inspection. 1496 */ 1497 if (pi != NULL && (m->m_flags & M_HASH)) { 1498 #ifdef RSS_DEBUG 1499 atomic_add_long(ðer_pktinfo_try, 1); 1500 #endif 1501 netisr_hashcheck(pi->pi_netisr, m, pi); 1502 if (m->m_flags & M_HASH) { 1503 ether_dispatch(pi->pi_netisr, m); 1504 #ifdef RSS_DEBUG 1505 atomic_add_long(ðer_pktinfo_hit, 1); 1506 #endif 1507 logether(pkt_end, ifp); 1508 return; 1509 } 1510 } 1511 #ifdef RSS_DEBUG 1512 else if (ifp->if_capenable & IFCAP_RSS) { 1513 if (pi == NULL) 1514 atomic_add_long(ðer_rss_nopi, 1); 1515 else 1516 atomic_add_long(ðer_rss_nohash, 1); 1517 } 1518 #endif 1519 1520 /* 1521 * Packet hash will be recalculated by software, so clear 1522 * the M_HASH and M_CKHASH flag set by the driver; the hash 1523 * value calculated by the hardware may not be exactly what 1524 * we want. 1525 */ 1526 m->m_flags &= ~(M_HASH | M_CKHASH); 1527 1528 if (!ether_vlancheck(&m)) { 1529 KKASSERT(m == NULL); 1530 logether(pkt_end, ifp); 1531 return; 1532 } 1533 1534 isr = ether_characterize(&m); 1535 if (m == NULL) { 1536 logether(pkt_end, ifp); 1537 return; 1538 } 1539 1540 /* 1541 * Finally dispatch it 1542 */ 1543 ether_dispatch(isr, m); 1544 1545 logether(pkt_end, ifp); 1546 } 1547 1548 static int 1549 ether_characterize(struct mbuf **m0) 1550 { 1551 struct mbuf *m = *m0; 1552 struct ether_header *eh; 1553 uint16_t ether_type; 1554 int isr; 1555 1556 eh = mtod(m, struct ether_header *); 1557 ether_type = ntohs(eh->ether_type); 1558 1559 /* 1560 * Map ether type to netisr id. 1561 */ 1562 switch (ether_type) { 1563 #ifdef INET 1564 case ETHERTYPE_IP: 1565 isr = NETISR_IP; 1566 break; 1567 1568 case ETHERTYPE_ARP: 1569 isr = NETISR_ARP; 1570 break; 1571 #endif 1572 1573 #ifdef INET6 1574 case ETHERTYPE_IPV6: 1575 isr = NETISR_IPV6; 1576 break; 1577 #endif 1578 1579 #ifdef IPX 1580 case ETHERTYPE_IPX: 1581 isr = NETISR_IPX; 1582 break; 1583 #endif 1584 1585 #ifdef MPLS 1586 case ETHERTYPE_MPLS: 1587 case ETHERTYPE_MPLS_MCAST: 1588 m->m_flags |= M_MPLSLABELED; 1589 isr = NETISR_MPLS; 1590 break; 1591 #endif 1592 1593 default: 1594 /* 1595 * NETISR_MAX is an invalid value; it is chosen to let 1596 * netisr_characterize() know that we have no clear 1597 * idea where this packet should go. 1598 */ 1599 isr = NETISR_MAX; 1600 break; 1601 } 1602 1603 /* 1604 * Ask the isr to characterize the packet since we couldn't. 1605 * This is an attempt to optimally get us onto the correct protocol 1606 * thread. 1607 */ 1608 netisr_characterize(isr, &m, sizeof(struct ether_header)); 1609 1610 *m0 = m; 1611 return isr; 1612 } 1613 1614 static void 1615 ether_demux_handler(netmsg_t nmsg) 1616 { 1617 struct netmsg_packet *nmp = &nmsg->packet; /* actual size */ 1618 struct ifnet *ifp; 1619 struct mbuf *m; 1620 1621 m = nmp->nm_packet; 1622 M_ASSERTPKTHDR(m); 1623 ifp = m->m_pkthdr.rcvif; 1624 1625 ether_demux_oncpu(ifp, m); 1626 } 1627 1628 void 1629 ether_demux(struct mbuf *m) 1630 { 1631 struct netmsg_packet *pmsg; 1632 int isr; 1633 1634 isr = ether_characterize(&m); 1635 if (m == NULL) 1636 return; 1637 1638 KKASSERT(m->m_flags & M_HASH); 1639 pmsg = &m->m_hdr.mh_netmsg; 1640 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 1641 0, ether_demux_handler); 1642 pmsg->nm_packet = m; 1643 pmsg->base.lmsg.u.ms_result = isr; 1644 1645 lwkt_sendmsg(netisr_hashport(m->m_pkthdr.hash), &pmsg->base.lmsg); 1646 } 1647 1648 boolean_t 1649 ether_tso_pullup(struct mbuf **mp, int *hoff0, struct ip **ip, int *iphlen, 1650 struct tcphdr **th, int *thoff) 1651 { 1652 struct mbuf *m = *mp; 1653 struct ether_header *eh; 1654 uint16_t type; 1655 int hoff; 1656 1657 KASSERT(M_WRITABLE(m), ("not writable")); 1658 1659 hoff = ETHER_HDR_LEN; 1660 if (m->m_len < hoff) { 1661 m = m_pullup(m, hoff); 1662 if (m == NULL) 1663 goto failed; 1664 } 1665 eh = mtod(m, struct ether_header *); 1666 type = eh->ether_type; 1667 1668 if (type == htons(ETHERTYPE_VLAN)) { 1669 struct ether_vlan_header *evh; 1670 1671 hoff += EVL_ENCAPLEN; 1672 if (m->m_len < hoff) { 1673 m = m_pullup(m, hoff); 1674 if (m == NULL) 1675 goto failed; 1676 } 1677 evh = mtod(m, struct ether_vlan_header *); 1678 type = evh->evl_proto; 1679 } 1680 KASSERT(type == htons(ETHERTYPE_IP), ("not IP %d", ntohs(type))); 1681 1682 *mp = m; 1683 *hoff0 = hoff; 1684 return tcp_tso_pullup(mp, hoff, ip, iphlen, th, thoff); 1685 1686 failed: 1687 if (m != NULL) 1688 m_freem(m); 1689 *mp = NULL; 1690 return FALSE; 1691 } 1692 1693 u_char * 1694 kether_aton(const char *macstr, u_char *addr) 1695 { 1696 unsigned int o0, o1, o2, o3, o4, o5; 1697 int n; 1698 1699 if (macstr == NULL || addr == NULL) 1700 return NULL; 1701 1702 n = ksscanf(macstr, "%x:%x:%x:%x:%x:%x", &o0, &o1, &o2, 1703 &o3, &o4, &o5); 1704 if (n != 6) 1705 return NULL; 1706 1707 addr[0] = o0; 1708 addr[1] = o1; 1709 addr[2] = o2; 1710 addr[3] = o3; 1711 addr[4] = o4; 1712 addr[5] = o5; 1713 1714 return addr; 1715 } 1716 1717 char * 1718 kether_ntoa(const u_char *addr, char *buf) 1719 { 1720 int len = ETHER_ADDRSTRLEN + 1; 1721 int n; 1722 1723 n = ksnprintf(buf, len, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], 1724 addr[1], addr[2], addr[3], addr[4], addr[5]); 1725 1726 if (n < 17) 1727 return NULL; 1728 1729 return buf; 1730 } 1731 1732 MODULE_VERSION(ether, 1); 1733