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