1 /* 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/net/if_vlan.c,v 1.15.2.13 2003/02/14 22:25:58 fenner Exp $ 30 */ 31 32 /* 33 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 34 * Might be extended some day to also handle IEEE 802.1p priority 35 * tagging. This is sort of sneaky in the implementation, since 36 * we need to pretend to be enough of an Ethernet implementation 37 * to make arp work. The way we do this is by telling everyone 38 * that we are an Ethernet, and then catch the packets that 39 * ether_output() left on our output queue queue when it calls 40 * if_start(), rewrite them for use by the real outgoing interface, 41 * and ask it to send them. 42 * 43 * 44 * Note about vlan's MP safe approach: 45 * 46 * - All configuration operation, e.g. config, unconfig and change flags, 47 * is serialized by netisr0; not by vlan's serializer 48 * 49 * - Parent interface's trunk and vlans are linked in the following 50 * fashion: 51 * CPU0 CPU1 CPU2 CPU3 52 * +--------------+--------+--------+--------+--------+ 53 * | parent ifnet |trunk[0]|trunk[1]|trunk[2]|trunk[3]| 54 * +--------------+--------+--------+--------+--------+ 55 * | | | | 56 * V V V V 57 * +--------------+--------+--------+--------+--------+ 58 * | vlan ifnet |entry[0]|entry[1]|entry[2]|entry[3]| 59 * +--------------+--------+--------+--------+--------+ 60 * | | | | 61 * V V V V 62 * +--------------+--------+--------+--------+--------+ 63 * | vlan ifnet |entry[0]|entry[1]|entry[2]|entry[3]| 64 * +--------------+--------+--------+--------+--------+ 65 * 66 * - Vlan is linked/unlinked onto parent interface's trunk using following 67 * way: 68 * 69 * CPU0 CPU1 CPU2 CPU3 70 * 71 * netisr0 <----------------------------------------------+ 72 * (config/unconfig) | 73 * | | 74 * | domsg | replymsg 75 * : (link/unlink) | 76 * : | 77 * : fwdmsg fwdmsg fwdmsg | 78 * :-----------> netisr1 --------> netisr2 --------> netisr3 79 * (link/unlink) (link/unlink) (link/unlink) 80 * 81 * - Parent interface's trunk is destroyed in the following lockless way: 82 * 83 * old_trunk = ifp->if_vlantrunks; 84 * ifp->if_vlantrunks = NULL; 85 * netmsg_service_sync(); 86 * (*) 87 * free(old_trunk); 88 * 89 * Since all of the accessing of if_vlantrunks only happens in network 90 * threads (percpu netisr and ifnet threads), after netmsg_service_sync() 91 * the network threads are promised to see only NULL if_vlantrunks; we 92 * are safe to free the "to be destroyed" parent interface's trunk 93 * afterwards. 94 */ 95 96 #ifndef NVLAN 97 #include "use_vlan.h" 98 #endif 99 #include "opt_inet.h" 100 101 #include <sys/param.h> 102 #include <sys/systm.h> 103 #include <sys/kernel.h> 104 #include <sys/malloc.h> 105 #include <sys/mbuf.h> 106 #include <sys/module.h> 107 #include <sys/queue.h> 108 #include <sys/socket.h> 109 #include <sys/sockio.h> 110 #include <sys/sysctl.h> 111 #include <sys/bus.h> 112 #include <sys/thread2.h> 113 114 #include <net/bpf.h> 115 #include <net/ethernet.h> 116 #include <net/if.h> 117 #include <net/if_arp.h> 118 #include <net/if_dl.h> 119 #include <net/if_types.h> 120 #include <net/ifq_var.h> 121 #include <net/if_clone.h> 122 #include <net/netmsg2.h> 123 #include <net/netisr2.h> 124 125 #ifdef INET 126 #include <netinet/in.h> 127 #include <netinet/if_ether.h> 128 #endif 129 130 #include <net/vlan/if_vlan_var.h> 131 #include <net/vlan/if_vlan_ether.h> 132 133 struct ifvlan; 134 135 struct vlan_mc_entry { 136 struct ether_addr mc_addr; 137 SLIST_ENTRY(vlan_mc_entry) mc_entries; 138 }; 139 140 struct vlan_entry { 141 struct ifvlan *ifv; 142 LIST_ENTRY(vlan_entry) ifv_link; 143 }; 144 145 struct ifvlan { 146 struct arpcom ifv_ac; /* make this an interface */ 147 struct ifnet *ifv_p; /* parent inteface of this vlan */ 148 int ifv_pflags; /* special flags we have set on parent */ 149 struct ifv_linkmib { 150 int ifvm_parent; 151 uint16_t ifvm_proto; /* encapsulation ethertype */ 152 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 153 } ifv_mib; 154 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 155 LIST_ENTRY(ifvlan) ifv_list; 156 struct vlan_entry ifv_entries[1]; 157 }; 158 #define ifv_if ifv_ac.ac_if 159 #define ifv_tag ifv_mib.ifvm_tag 160 161 struct vlan_trunk { 162 LIST_HEAD(, vlan_entry) vlan_list; 163 }; 164 165 struct netmsg_vlan { 166 struct netmsg_base base; 167 struct ifvlan *nv_ifv; 168 struct ifnet *nv_ifp_p; 169 const char *nv_parent_name; 170 uint16_t nv_vlantag; 171 }; 172 173 #define VLANNAME "vlan" 174 175 SYSCTL_DECL(_net_link); 176 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 177 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 178 179 static MALLOC_DEFINE(M_VLAN, "vlan", "802.1Q Virtual LAN Interface"); 180 static LIST_HEAD(, ifvlan) ifv_list; 181 182 static int vlan_clone_create(struct if_clone *, int, caddr_t, caddr_t); 183 static int vlan_clone_destroy(struct ifnet *); 184 static void vlan_ifdetach(void *, struct ifnet *); 185 186 static void vlan_init(void *); 187 static void vlan_start(struct ifnet *, struct ifaltq_subque *); 188 static int vlan_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 189 static void vlan_input(struct mbuf *); 190 191 static int vlan_setflags(struct ifvlan *, struct ifnet *, int); 192 static int vlan_setflag(struct ifvlan *, struct ifnet *, int, int, 193 int (*)(struct ifnet *, int)); 194 static int vlan_config_flags(struct ifvlan *ifv); 195 static void vlan_clrmulti(struct ifvlan *, struct ifnet *); 196 static int vlan_setmulti(struct ifvlan *, struct ifnet *); 197 static int vlan_config_multi(struct ifvlan *); 198 static int vlan_config(struct ifvlan *, const char *, uint16_t); 199 static int vlan_unconfig(struct ifvlan *); 200 static void vlan_link(struct ifvlan *, struct ifnet *); 201 static void vlan_unlink(struct ifvlan *, struct ifnet *); 202 203 static void vlan_config_dispatch(netmsg_t); 204 static void vlan_unconfig_dispatch(netmsg_t); 205 static void vlan_link_dispatch(netmsg_t); 206 static void vlan_unlink_dispatch(netmsg_t); 207 static void vlan_multi_dispatch(netmsg_t); 208 static void vlan_flags_dispatch(netmsg_t); 209 static void vlan_ifdetach_dispatch(netmsg_t); 210 211 /* Special flags we should propagate to parent */ 212 static struct { 213 int flag; 214 int (*func)(struct ifnet *, int); 215 } vlan_pflags[] = { 216 { IFF_PROMISC, ifpromisc }, 217 { IFF_ALLMULTI, if_allmulti }, 218 { 0, NULL } 219 }; 220 221 static eventhandler_tag vlan_ifdetach_cookie; 222 static struct if_clone vlan_cloner = 223 IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy, 224 NVLAN, IF_MAXUNIT); 225 226 /* 227 * Handle IFF_* flags that require certain changes on the parent: 228 * if "set" is true, update parent's flags respective to our if_flags; 229 * if "set" is false, forcedly clear the flags set on parent. 230 */ 231 static int 232 vlan_setflags(struct ifvlan *ifv, struct ifnet *ifp_p, int set) 233 { 234 int error, i; 235 236 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 237 238 for (i = 0; vlan_pflags[i].func != NULL; i++) { 239 error = vlan_setflag(ifv, ifp_p, vlan_pflags[i].flag, 240 set, vlan_pflags[i].func); 241 if (error) 242 return error; 243 } 244 return 0; 245 } 246 247 /* Handle a reference counted flag that should be set on the parent as well */ 248 static int 249 vlan_setflag(struct ifvlan *ifv, struct ifnet *ifp_p, int flag, int set, 250 int (*func)(struct ifnet *, int)) 251 { 252 struct ifnet *ifp = &ifv->ifv_if; 253 int error, ifv_flag; 254 255 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 256 257 ifv_flag = set ? (ifp->if_flags & flag) : 0; 258 259 /* 260 * See if recorded parent's status is different from what 261 * we want it to be. If it is, flip it. We record parent's 262 * status in ifv_pflags so that we won't clear parent's flag 263 * we haven't set. In fact, we don't clear or set parent's 264 * flags directly, but get or release references to them. 265 * That's why we can be sure that recorded flags still are 266 * in accord with actual parent's flags. 267 */ 268 if (ifv_flag != (ifv->ifv_pflags & flag)) { 269 error = func(ifp_p, ifv_flag); 270 if (error) 271 return error; 272 ifv->ifv_pflags &= ~flag; 273 ifv->ifv_pflags |= ifv_flag; 274 } 275 return 0; 276 } 277 278 /* 279 * Program our multicast filter. What we're actually doing is 280 * programming the multicast filter of the parent. This has the 281 * side effect of causing the parent interface to receive multicast 282 * traffic that it doesn't really want, which ends up being discarded 283 * later by the upper protocol layers. Unfortunately, there's no way 284 * to avoid this: there really is only one physical interface. 285 */ 286 static int 287 vlan_setmulti(struct ifvlan *ifv, struct ifnet *ifp_p) 288 { 289 struct ifmultiaddr *ifma; 290 struct vlan_mc_entry *mc = NULL; 291 struct sockaddr_dl sdl; 292 struct ifnet *ifp = &ifv->ifv_if; 293 294 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 295 296 /* 297 * First, remove any existing filter entries. 298 */ 299 vlan_clrmulti(ifv, ifp_p); 300 301 /* 302 * Save the filter entries to be added to parent. 303 * 304 * TODO: need ifnet_serialize_main 305 */ 306 ifnet_serialize_all(ifp); 307 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 308 if (ifma->ifma_addr->sa_family != AF_LINK) 309 continue; 310 311 /* Save a copy */ 312 mc = kmalloc(sizeof(struct vlan_mc_entry), M_VLAN, M_WAITOK); 313 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 314 &mc->mc_addr, ETHER_ADDR_LEN); 315 SLIST_INSERT_HEAD(&ifv->vlan_mc_listhead, mc, mc_entries); 316 } 317 ifnet_deserialize_all(ifp); 318 319 /* 320 * Now program new ones. 321 */ 322 bzero(&sdl, sizeof(sdl)); 323 sdl.sdl_len = sizeof(sdl); 324 sdl.sdl_family = AF_LINK; 325 sdl.sdl_index = ifp_p->if_index; 326 sdl.sdl_type = IFT_ETHER; 327 sdl.sdl_alen = ETHER_ADDR_LEN; 328 329 /* 330 * Program the parent multicast filter 331 */ 332 SLIST_FOREACH(mc, &ifv->vlan_mc_listhead, mc_entries) { 333 int error; 334 335 bcopy(&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 336 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, NULL); 337 if (error) { 338 /* XXX probably should keep going */ 339 return error; 340 } 341 } 342 return 0; 343 } 344 345 static void 346 vlan_clrmulti(struct ifvlan *ifv, struct ifnet *ifp_p) 347 { 348 struct vlan_mc_entry *mc; 349 struct sockaddr_dl sdl; 350 351 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 352 353 bzero(&sdl, sizeof(sdl)); 354 sdl.sdl_len = sizeof(sdl); 355 sdl.sdl_family = AF_LINK; 356 sdl.sdl_index = ifp_p->if_index; 357 sdl.sdl_type = IFT_ETHER; 358 sdl.sdl_alen = ETHER_ADDR_LEN; 359 360 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 361 bcopy(&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 362 if_delmulti(ifp_p, (struct sockaddr *)&sdl); /* ignore error */ 363 364 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 365 kfree(mc, M_VLAN); 366 } 367 } 368 369 static int 370 vlan_modevent(module_t mod, int type, void *data) 371 { 372 switch (type) { 373 case MOD_LOAD: 374 LIST_INIT(&ifv_list); 375 vlan_input_p = vlan_input; 376 vlan_ifdetach_cookie = 377 EVENTHANDLER_REGISTER(ifnet_detach_event, 378 vlan_ifdetach, NULL, 379 EVENTHANDLER_PRI_ANY); 380 if_clone_attach(&vlan_cloner); 381 break; 382 383 case MOD_UNLOAD: 384 if_clone_detach(&vlan_cloner); 385 386 vlan_input_p = NULL; 387 /* 388 * Make sure that all protocol threads see vlan_input_p change. 389 */ 390 netmsg_service_sync(); 391 392 EVENTHANDLER_DEREGISTER(ifnet_detach_event, 393 vlan_ifdetach_cookie); 394 while (!LIST_EMPTY(&ifv_list)) 395 vlan_clone_destroy(&LIST_FIRST(&ifv_list)->ifv_if); 396 break; 397 } 398 return 0; 399 } 400 401 static moduledata_t vlan_mod = { 402 "if_vlan", 403 vlan_modevent, 404 0 405 }; 406 407 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 408 409 static void 410 vlan_ifdetach_dispatch(netmsg_t msg) 411 { 412 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 413 struct ifnet *ifp_p = vmsg->nv_ifp_p; 414 struct vlan_trunk *vlantrunks, *trunk; 415 struct vlan_entry *ifve; 416 417 vlantrunks = ifp_p->if_vlantrunks; 418 if (vlantrunks == NULL) 419 goto reply; 420 trunk = &vlantrunks[mycpuid]; 421 422 while (ifp_p->if_vlantrunks && 423 (ifve = LIST_FIRST(&trunk->vlan_list)) != NULL) 424 vlan_unconfig(ifve->ifv); 425 reply: 426 lwkt_replymsg(&vmsg->base.lmsg, 0); 427 } 428 429 static void 430 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 431 { 432 struct netmsg_vlan vmsg; 433 434 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 435 436 bzero(&vmsg, sizeof(vmsg)); 437 438 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 439 0, vlan_ifdetach_dispatch); 440 vmsg.nv_ifp_p = ifp; 441 442 lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 443 } 444 445 static int 446 vlan_clone_create(struct if_clone *ifc, int unit, 447 caddr_t params __unused, caddr_t data __unused) 448 { 449 struct ifvlan *ifv; 450 struct ifnet *ifp; 451 int vlan_size, i; 452 453 vlan_size = sizeof(struct ifvlan) 454 + ((netisr_ncpus - 1) * sizeof(struct vlan_entry)); 455 ifv = kmalloc(vlan_size, M_VLAN, M_WAITOK | M_ZERO); 456 SLIST_INIT(&ifv->vlan_mc_listhead); 457 for (i = 0; i < netisr_ncpus; ++i) 458 ifv->ifv_entries[i].ifv = ifv; 459 460 crit_enter(); /* XXX not MP safe */ 461 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 462 crit_exit(); 463 464 ifp = &ifv->ifv_if; 465 ifp->if_softc = ifv; 466 if_initname(ifp, "vlan", unit); 467 /* NB: flags are not set here */ 468 ifp->if_linkmib = &ifv->ifv_mib; 469 ifp->if_linkmiblen = sizeof ifv->ifv_mib; 470 /* NB: mtu is not set here */ 471 472 ifp->if_init = vlan_init; 473 ifp->if_start = vlan_start; 474 ifp->if_ioctl = vlan_ioctl; 475 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 476 ifq_set_ready(&ifp->if_snd); 477 ether_ifattach(ifp, ifv->ifv_ac.ac_enaddr, NULL); 478 /* Now undo some of the damage... */ 479 ifp->if_data.ifi_type = IFT_L2VLAN; 480 ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN; 481 482 return (0); 483 } 484 485 static int 486 vlan_clone_destroy(struct ifnet *ifp) 487 { 488 struct ifvlan *ifv = ifp->if_softc; 489 490 crit_enter(); /* XXX not MP safe */ 491 LIST_REMOVE(ifv, ifv_list); 492 crit_exit(); 493 494 vlan_unconfig(ifv); 495 ether_ifdetach(ifp); 496 497 kfree(ifv, M_VLAN); 498 499 return 0; 500 } 501 502 static void 503 vlan_init(void *xsc) 504 { 505 struct ifvlan *ifv = xsc; 506 struct ifnet *ifp = &ifv->ifv_if; 507 508 ASSERT_IFNET_SERIALIZED_ALL(ifp); 509 510 if (ifv->ifv_p != NULL) 511 ifp->if_flags |= IFF_RUNNING; 512 } 513 514 static void 515 vlan_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 516 { 517 struct ifvlan *ifv = ifp->if_softc; 518 struct ifnet *ifp_p = ifv->ifv_p; 519 struct mbuf *m; 520 lwkt_port_t p_port; 521 522 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 523 ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq); 524 525 if (ifp_p == NULL) { 526 ifsq_purge(ifsq); 527 return; 528 } 529 530 if ((ifp->if_flags & IFF_RUNNING) == 0) 531 return; 532 533 p_port = netisr_cpuport( 534 ifsq_get_cpuid(ifq_get_subq_default(&ifp_p->if_snd))); 535 for (;;) { 536 struct netmsg_packet *nmp; 537 538 m = ifsq_dequeue(ifsq); 539 if (m == NULL) 540 break; 541 BPF_MTAP(ifp, m); 542 543 /* 544 * Do not run parent's if_start() if the parent is not up, 545 * or parent's driver will cause a system crash. 546 */ 547 if ((ifp_p->if_flags & (IFF_UP | IFF_RUNNING)) != 548 (IFF_UP | IFF_RUNNING)) { 549 m_freem(m); 550 IFNET_STAT_INC(ifp, collisions, 1); 551 continue; 552 } 553 554 /* 555 * We need some way to tell the interface where the packet 556 * came from so that it knows how to find the VLAN tag to 557 * use, so we set the ether_vlantag in the mbuf packet header 558 * to our vlan tag. We also set the M_VLANTAG flag in the 559 * mbuf to let the parent driver know that the ether_vlantag 560 * is really valid. 561 */ 562 m->m_pkthdr.ether_vlantag = ifv->ifv_tag; 563 m->m_flags |= M_VLANTAG; 564 565 nmp = &m->m_hdr.mh_netmsg; 566 567 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 568 0, vlan_start_dispatch); 569 nmp->nm_packet = m; 570 nmp->base.lmsg.u.ms_resultp = ifp_p; 571 572 lwkt_sendmsg(p_port, &nmp->base.lmsg); 573 IFNET_STAT_INC(ifp, opackets, 1); 574 } 575 } 576 577 static void 578 vlan_input(struct mbuf *m) 579 { 580 struct ifvlan *ifv = NULL; 581 struct ifnet *rcvif; 582 struct vlan_trunk *vlantrunks; 583 struct vlan_entry *entry; 584 int cpuid = mycpuid; 585 586 ASSERT_NETISR_NCPUS(cpuid); 587 588 rcvif = m->m_pkthdr.rcvif; 589 KKASSERT(m->m_flags & M_VLANTAG); 590 591 vlantrunks = rcvif->if_vlantrunks; 592 /* Make sure 'vlantrunks' is really used. */ 593 cpu_ccfence(); 594 if (vlantrunks == NULL) { 595 IFNET_STAT_INC(rcvif, noproto, 1); 596 m_freem(m); 597 return; 598 } 599 600 crit_enter(); /* XXX Necessary? */ 601 LIST_FOREACH(entry, &vlantrunks[cpuid].vlan_list, ifv_link) { 602 if (entry->ifv->ifv_tag == 603 EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag)) { 604 ifv = entry->ifv; 605 break; 606 } 607 } 608 crit_exit(); 609 610 /* 611 * Packet is discarded if: 612 * - no corresponding vlan(4) interface 613 * - vlan(4) interface has not been completely set up yet, 614 * or is being destroyed (ifv->ifv_p != rcvif) 615 */ 616 if (ifv == NULL || ifv->ifv_p != rcvif) { 617 IFNET_STAT_INC(rcvif, noproto, 1); 618 m_freem(m); 619 return; 620 } 621 622 /* 623 * Clear M_VLANTAG, before the packet is handed to 624 * vlan(4) interface 625 */ 626 m->m_flags &= ~M_VLANTAG; 627 628 ether_reinput_oncpu(&ifv->ifv_if, m, REINPUT_RUNBPF); 629 } 630 631 static void 632 vlan_link_dispatch(netmsg_t msg) 633 { 634 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 635 struct ifvlan *ifv = vmsg->nv_ifv; 636 struct ifnet *ifp_p = vmsg->nv_ifp_p; 637 struct vlan_entry *entry; 638 struct vlan_trunk *vlantrunks, *trunk; 639 int cpu = mycpuid; 640 641 vlantrunks = ifp_p->if_vlantrunks; 642 KASSERT(vlantrunks != NULL, 643 ("vlan trunk has not been initialized yet")); 644 645 entry = &ifv->ifv_entries[cpu]; 646 trunk = &vlantrunks[cpu]; 647 648 crit_enter(); 649 LIST_INSERT_HEAD(&trunk->vlan_list, entry, ifv_link); 650 crit_exit(); 651 652 netisr_forwardmsg(&vmsg->base, cpu + 1); 653 } 654 655 static void 656 vlan_link(struct ifvlan *ifv, struct ifnet *ifp_p) 657 { 658 struct netmsg_vlan vmsg; 659 660 /* Assert in netisr0 */ 661 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 662 663 if (ifp_p->if_vlantrunks == NULL) { 664 struct vlan_trunk *vlantrunks; 665 int i; 666 667 vlantrunks = kmalloc(sizeof(*vlantrunks) * netisr_ncpus, M_VLAN, 668 M_WAITOK | M_ZERO); 669 for (i = 0; i < netisr_ncpus; ++i) 670 LIST_INIT(&vlantrunks[i].vlan_list); 671 672 ifp_p->if_vlantrunks = vlantrunks; 673 } 674 675 bzero(&vmsg, sizeof(vmsg)); 676 677 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 678 0, vlan_link_dispatch); 679 vmsg.nv_ifv = ifv; 680 vmsg.nv_ifp_p = ifp_p; 681 682 netisr_domsg(&vmsg.base, 0); 683 } 684 685 static void 686 vlan_config_dispatch(netmsg_t msg) 687 { 688 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 689 struct ifvlan *ifv; 690 struct ifnet *ifp_p, *ifp; 691 struct sockaddr_dl *sdl1, *sdl2; 692 int error; 693 694 /* Assert in netisr0 */ 695 696 ifp_p = ifunit_netisr(vmsg->nv_parent_name); 697 if (ifp_p == NULL) { 698 error = ENOENT; 699 goto reply; 700 } 701 702 if (ifp_p->if_data.ifi_type != IFT_ETHER) { 703 error = EPROTONOSUPPORT; 704 goto reply; 705 } 706 707 ifv = vmsg->nv_ifv; 708 ifp = &ifv->ifv_if; 709 710 if (ifv->ifv_p) { 711 error = EBUSY; 712 goto reply; 713 } 714 715 /* Link vlan into parent's vlantrunk */ 716 vlan_link(ifv, ifp_p); 717 718 ifnet_serialize_all(ifp); 719 720 ifv->ifv_tag = vmsg->nv_vlantag; 721 if (ifp_p->if_capenable & IFCAP_VLAN_MTU) 722 ifp->if_mtu = ifp_p->if_mtu; 723 else 724 ifp->if_mtu = ifp_p->if_data.ifi_mtu - EVL_ENCAPLEN; 725 726 /* 727 * Copy only a selected subset of flags from the parent. 728 * Other flags are none of our business. 729 */ 730 #define VLAN_INHERIT_FLAGS (IFF_BROADCAST | IFF_MULTICAST | \ 731 IFF_SIMPLEX | IFF_POINTOPOINT) 732 733 ifp->if_flags &= ~VLAN_INHERIT_FLAGS; 734 ifp->if_flags |= (ifp_p->if_flags & VLAN_INHERIT_FLAGS); 735 736 #undef VLAN_INHERIT_FLAGS 737 738 /* 739 * Set up our ``Ethernet address'' to reflect the underlying 740 * physical interface's. 741 */ 742 sdl1 = IF_LLSOCKADDR(ifp); 743 sdl2 = IF_LLSOCKADDR(ifp_p); 744 sdl1->sdl_type = IFT_ETHER; 745 sdl1->sdl_alen = ETHER_ADDR_LEN; 746 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 747 bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 748 749 /* 750 * Release vlan's serializer before reprogramming parent's 751 * multicast filter to avoid possible dead lock. 752 */ 753 ifnet_deserialize_all(ifp); 754 755 /* 756 * Configure multicast addresses that may already be 757 * joined on the vlan device. 758 */ 759 vlan_setmulti(ifv, ifp_p); 760 761 /* 762 * Set flags on the parent, if necessary. 763 */ 764 vlan_setflags(ifv, ifp_p, 1); 765 766 /* 767 * Connect to parent after everything have been set up, 768 * so input/output could know that vlan is ready to go 769 */ 770 ifv->ifv_p = ifp_p; 771 error = 0; 772 reply: 773 lwkt_replymsg(&vmsg->base.lmsg, error); 774 } 775 776 static int 777 vlan_config(struct ifvlan *ifv, const char *parent_name, uint16_t vlantag) 778 { 779 struct netmsg_vlan vmsg; 780 781 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 782 783 bzero(&vmsg, sizeof(vmsg)); 784 785 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 786 0, vlan_config_dispatch); 787 vmsg.nv_ifv = ifv; 788 vmsg.nv_parent_name = parent_name; 789 vmsg.nv_vlantag = vlantag; 790 791 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 792 } 793 794 static void 795 vlan_unlink_dispatch(netmsg_t msg) 796 { 797 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 798 struct ifvlan *ifv = vmsg->nv_ifv; 799 struct vlan_entry *entry; 800 int cpu = mycpuid; 801 802 KASSERT(vmsg->nv_ifp_p->if_vlantrunks != NULL, 803 ("vlan trunk has not been initialized yet")); 804 entry = &ifv->ifv_entries[cpu]; 805 806 crit_enter(); 807 LIST_REMOVE(entry, ifv_link); 808 crit_exit(); 809 810 netisr_forwardmsg(&vmsg->base, cpu + 1); 811 } 812 813 static void 814 vlan_unlink(struct ifvlan *ifv, struct ifnet *ifp_p) 815 { 816 struct vlan_trunk *vlantrunks = ifp_p->if_vlantrunks; 817 struct netmsg_vlan vmsg; 818 819 /* Assert in netisr0 */ 820 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 821 822 KASSERT(ifp_p->if_vlantrunks != NULL, 823 ("vlan trunk has not been initialized yet")); 824 825 bzero(&vmsg, sizeof(vmsg)); 826 827 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 828 0, vlan_unlink_dispatch); 829 vmsg.nv_ifv = ifv; 830 vmsg.nv_ifp_p = ifp_p; 831 832 netisr_domsg(&vmsg.base, 0); 833 834 crit_enter(); 835 if (LIST_EMPTY(&vlantrunks[mycpuid].vlan_list)) { 836 ifp_p->if_vlantrunks = NULL; 837 838 /* 839 * Make sure that all protocol threads see if_vlantrunks change. 840 */ 841 netmsg_service_sync(); 842 kfree(vlantrunks, M_VLAN); 843 } 844 crit_exit(); 845 } 846 847 static void 848 vlan_unconfig_dispatch(netmsg_t msg) 849 { 850 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 851 struct sockaddr_dl *sdl; 852 struct ifvlan *ifv; 853 struct ifnet *ifp_p, *ifp; 854 int error; 855 856 /* Assert in netisr0 */ 857 858 ifv = vmsg->nv_ifv; 859 ifp = &ifv->ifv_if; 860 861 if (ifp->if_flags & IFF_UP) 862 if_down(ifp); 863 864 ifnet_serialize_all(ifp); 865 866 ifp->if_flags &= ~IFF_RUNNING; 867 868 /* 869 * Save parent ifnet pointer and disconnect from parent. 870 * 871 * This is done early in this function, so input/output could 872 * know that we are disconnecting. 873 */ 874 ifp_p = ifv->ifv_p; 875 ifv->ifv_p = NULL; 876 877 /* 878 * Release vlan's serializer before reprogramming parent's 879 * multicast filter to avoid possible dead lock. 880 */ 881 ifnet_deserialize_all(ifp); 882 883 if (ifp_p) { 884 /* 885 * Since the interface is being unconfigured, we need to 886 * empty the list of multicast groups that we may have joined 887 * while we were alive from the parent's list. 888 */ 889 vlan_clrmulti(ifv, ifp_p); 890 891 /* Clear parent's flags which was set by us. */ 892 vlan_setflags(ifv, ifp_p, 0); 893 } 894 895 ifnet_serialize_all(ifp); 896 897 ifp->if_mtu = ETHERMTU; 898 899 /* Clear our MAC address. */ 900 sdl = IF_LLSOCKADDR(ifp); 901 sdl->sdl_type = IFT_ETHER; 902 sdl->sdl_alen = ETHER_ADDR_LEN; 903 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 904 bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 905 906 ifnet_deserialize_all(ifp); 907 908 /* Unlink vlan from parent's vlantrunk */ 909 if (ifp_p != NULL && ifp_p->if_vlantrunks != NULL) 910 vlan_unlink(ifv, ifp_p); 911 912 error = 0; 913 lwkt_replymsg(&vmsg->base.lmsg, error); 914 } 915 916 static int 917 vlan_unconfig(struct ifvlan *ifv) 918 { 919 struct netmsg_vlan vmsg; 920 921 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 922 923 bzero(&vmsg, sizeof(vmsg)); 924 925 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 926 0, vlan_unconfig_dispatch); 927 vmsg.nv_ifv = ifv; 928 929 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 930 } 931 932 static int 933 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 934 { 935 struct ifvlan *ifv = ifp->if_softc; 936 struct ifreq *ifr = (struct ifreq *)data; 937 struct ifnet *ifp_p; 938 struct vlanreq vlr; 939 int error = 0; 940 941 ASSERT_IFNET_SERIALIZED_ALL(ifp); 942 943 switch (cmd) { 944 case SIOCGIFMEDIA: 945 ifp_p = ifv->ifv_p; 946 if (ifp_p != NULL) { 947 /* 948 * Release vlan interface's serializer to void 949 * possible dead lock. 950 */ 951 ifnet_deserialize_all(ifp); 952 953 ifnet_serialize_all(ifp_p); 954 error = ifp_p->if_ioctl(ifp_p, SIOCGIFMEDIA, data, cr); 955 ifnet_deserialize_all(ifp_p); 956 957 ifnet_serialize_all(ifp); 958 959 if (ifv->ifv_p == NULL || ifv->ifv_p != ifp_p) { 960 /* 961 * We are disconnected from the original 962 * parent interface or the parent interface 963 * is changed, after vlan interface's 964 * serializer is released. 965 */ 966 error = EINVAL; 967 } 968 969 /* Limit the result to the parent's current config. */ 970 if (error == 0) { 971 struct ifmediareq *ifmr; 972 973 ifmr = (struct ifmediareq *) data; 974 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 975 ifmr->ifm_count = 1; 976 error = copyout(&ifmr->ifm_current, 977 ifmr->ifm_ulist, 978 sizeof(int)); 979 } 980 } 981 } else { 982 error = EINVAL; 983 } 984 break; 985 986 case SIOCSIFMEDIA: 987 error = EINVAL; 988 break; 989 990 case SIOCSETVLAN: 991 error = copyin(ifr->ifr_data, &vlr, sizeof vlr); 992 if (error) 993 break; 994 995 ifnet_deserialize_all(ifp); 996 if (vlr.vlr_parent[0] == '\0') 997 error = vlan_unconfig(ifv); 998 else 999 error = vlan_config(ifv, vlr.vlr_parent, vlr.vlr_tag); 1000 ifnet_serialize_all(ifp); 1001 break; 1002 1003 case SIOCGETVLAN: 1004 bzero(&vlr, sizeof(vlr)); 1005 if (ifv->ifv_p) { 1006 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname, 1007 sizeof(vlr.vlr_parent)); 1008 vlr.vlr_tag = ifv->ifv_tag; 1009 } 1010 error = copyout(&vlr, ifr->ifr_data, sizeof vlr); 1011 break; 1012 1013 case SIOCSIFFLAGS: 1014 if (ifp->if_flags & IFF_UP) 1015 ifp->if_init(ifp); 1016 else 1017 ifp->if_flags &= ~IFF_RUNNING; 1018 1019 /* 1020 * We should propagate selected flags to the parent, 1021 * e.g., promiscuous mode. 1022 */ 1023 ifnet_deserialize_all(ifp); 1024 error = vlan_config_flags(ifv); 1025 ifnet_serialize_all(ifp); 1026 break; 1027 1028 case SIOCADDMULTI: 1029 case SIOCDELMULTI: 1030 ifnet_deserialize_all(ifp); 1031 error = vlan_config_multi(ifv); 1032 ifnet_serialize_all(ifp); 1033 break; 1034 1035 default: 1036 error = ether_ioctl(ifp, cmd, data); 1037 break; 1038 } 1039 return error; 1040 } 1041 1042 static void 1043 vlan_multi_dispatch(netmsg_t msg) 1044 { 1045 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1046 struct ifvlan *ifv = vmsg->nv_ifv; 1047 int error = 0; 1048 1049 /* 1050 * If we don't have a parent, just remember the membership for 1051 * when we do. 1052 */ 1053 if (ifv->ifv_p != NULL) 1054 error = vlan_setmulti(ifv, ifv->ifv_p); 1055 lwkt_replymsg(&vmsg->base.lmsg, error); 1056 } 1057 1058 static int 1059 vlan_config_multi(struct ifvlan *ifv) 1060 { 1061 struct netmsg_vlan vmsg; 1062 1063 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1064 1065 bzero(&vmsg, sizeof(vmsg)); 1066 1067 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1068 0, vlan_multi_dispatch); 1069 vmsg.nv_ifv = ifv; 1070 1071 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1072 } 1073 1074 static void 1075 vlan_flags_dispatch(netmsg_t msg) 1076 { 1077 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1078 struct ifvlan *ifv = vmsg->nv_ifv; 1079 int error = 0; 1080 1081 /* 1082 * If we don't have a parent, just remember the flags for 1083 * when we do. 1084 */ 1085 if (ifv->ifv_p != NULL) 1086 error = vlan_setflags(ifv, ifv->ifv_p, 1); 1087 lwkt_replymsg(&vmsg->base.lmsg, error); 1088 } 1089 1090 static int 1091 vlan_config_flags(struct ifvlan *ifv) 1092 { 1093 struct netmsg_vlan vmsg; 1094 1095 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1096 1097 bzero(&vmsg, sizeof(vmsg)); 1098 1099 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1100 0, vlan_flags_dispatch); 1101 vmsg.nv_ifv = ifv; 1102 1103 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1104 } 1105