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 * | | 76 * V fwdmsg fwdmsg fwdmsg | 77 * ifnet0 --------> ifnet1 --------> ifnet2 --------> ifnet3 78 * (link/unlink) (link/unlink) (link/unlink) (link/unlink) 79 * 80 * - Parent interface's trunk is destroyed in the following lockless way: 81 * 82 * old_trunk = ifp->if_vlantrunks; 83 * ifp->if_vlantrunks = NULL; 84 * netmsg_service_sync(); 85 * (*) 86 * free(old_trunk); 87 * 88 * Since all of the accessing of if_vlantrunks only happens in network 89 * threads (percpu netisr and ifnet threads), after netmsg_service_sync() 90 * the network threads are promised to see only NULL if_vlantrunks; we 91 * are safe to free the "to be destroyed" parent interface's trunk 92 * afterwards. 93 */ 94 95 #ifndef NVLAN 96 #include "use_vlan.h" 97 #endif 98 #include "opt_inet.h" 99 100 #include <sys/param.h> 101 #include <sys/systm.h> 102 #include <sys/kernel.h> 103 #include <sys/malloc.h> 104 #include <sys/mbuf.h> 105 #include <sys/module.h> 106 #include <sys/queue.h> 107 #include <sys/socket.h> 108 #include <sys/sockio.h> 109 #include <sys/sysctl.h> 110 #include <sys/bus.h> 111 #include <sys/thread2.h> 112 113 #include <net/bpf.h> 114 #include <net/ethernet.h> 115 #include <net/if.h> 116 #include <net/if_arp.h> 117 #include <net/if_dl.h> 118 #include <net/if_types.h> 119 #include <net/ifq_var.h> 120 #include <net/if_clone.h> 121 #include <net/netmsg2.h> 122 #include <net/netisr2.h> 123 124 #ifdef INET 125 #include <netinet/in.h> 126 #include <netinet/if_ether.h> 127 #endif 128 129 #include <net/vlan/if_vlan_var.h> 130 #include <net/vlan/if_vlan_ether.h> 131 132 struct ifvlan; 133 134 struct vlan_mc_entry { 135 struct ether_addr mc_addr; 136 SLIST_ENTRY(vlan_mc_entry) mc_entries; 137 }; 138 139 struct vlan_entry { 140 struct ifvlan *ifv; 141 LIST_ENTRY(vlan_entry) ifv_link; 142 }; 143 144 struct ifvlan { 145 struct arpcom ifv_ac; /* make this an interface */ 146 struct ifnet *ifv_p; /* parent inteface of this vlan */ 147 int ifv_pflags; /* special flags we have set on parent */ 148 struct ifv_linkmib { 149 int ifvm_parent; 150 uint16_t ifvm_proto; /* encapsulation ethertype */ 151 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 152 } ifv_mib; 153 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 154 LIST_ENTRY(ifvlan) ifv_list; 155 struct vlan_entry ifv_entries[1]; 156 }; 157 #define ifv_if ifv_ac.ac_if 158 #define ifv_tag ifv_mib.ifvm_tag 159 160 struct vlan_trunk { 161 LIST_HEAD(, vlan_entry) vlan_list; 162 }; 163 164 struct netmsg_vlan { 165 struct netmsg_base base; 166 struct ifvlan *nv_ifv; 167 struct ifnet *nv_ifp_p; 168 const char *nv_parent_name; 169 uint16_t nv_vlantag; 170 }; 171 172 #define VLANNAME "vlan" 173 174 SYSCTL_DECL(_net_link); 175 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 176 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 177 178 static MALLOC_DEFINE(M_VLAN, "vlan", "802.1Q Virtual LAN Interface"); 179 static LIST_HEAD(, ifvlan) ifv_list; 180 181 static int vlan_clone_create(struct if_clone *, int, caddr_t); 182 static int vlan_clone_destroy(struct ifnet *); 183 static void vlan_ifdetach(void *, struct ifnet *); 184 185 static void vlan_init(void *); 186 static void vlan_start(struct ifnet *, struct ifaltq_subque *); 187 static int vlan_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 188 static void vlan_input(struct mbuf *); 189 190 static int vlan_setflags(struct ifvlan *, struct ifnet *, int); 191 static int vlan_setflag(struct ifvlan *, struct ifnet *, int, int, 192 int (*)(struct ifnet *, int)); 193 static int vlan_config_flags(struct ifvlan *ifv); 194 static void vlan_clrmulti(struct ifvlan *, struct ifnet *); 195 static int vlan_setmulti(struct ifvlan *, struct ifnet *); 196 static int vlan_config_multi(struct ifvlan *); 197 static int vlan_config(struct ifvlan *, const char *, uint16_t); 198 static int vlan_unconfig(struct ifvlan *); 199 static void vlan_link(struct ifvlan *, struct ifnet *); 200 static void vlan_unlink(struct ifvlan *, struct ifnet *); 201 202 static void vlan_config_dispatch(netmsg_t); 203 static void vlan_unconfig_dispatch(netmsg_t); 204 static void vlan_link_dispatch(netmsg_t); 205 static void vlan_unlink_dispatch(netmsg_t); 206 static void vlan_multi_dispatch(netmsg_t); 207 static void vlan_flags_dispatch(netmsg_t); 208 static void vlan_ifdetach_dispatch(netmsg_t); 209 210 /* Special flags we should propagate to parent */ 211 static struct { 212 int flag; 213 int (*func)(struct ifnet *, int); 214 } vlan_pflags[] = { 215 { IFF_PROMISC, ifpromisc }, 216 { IFF_ALLMULTI, if_allmulti }, 217 { 0, NULL } 218 }; 219 220 static eventhandler_tag vlan_ifdetach_cookie; 221 static struct if_clone vlan_cloner = 222 IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy, 223 NVLAN, IF_MAXUNIT); 224 225 /* 226 * Handle IFF_* flags that require certain changes on the parent: 227 * if "set" is true, update parent's flags respective to our if_flags; 228 * if "set" is false, forcedly clear the flags set on parent. 229 */ 230 static int 231 vlan_setflags(struct ifvlan *ifv, struct ifnet *ifp_p, int set) 232 { 233 int error, i; 234 235 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 236 237 for (i = 0; vlan_pflags[i].func != NULL; i++) { 238 error = vlan_setflag(ifv, ifp_p, vlan_pflags[i].flag, 239 set, vlan_pflags[i].func); 240 if (error) 241 return error; 242 } 243 return 0; 244 } 245 246 /* Handle a reference counted flag that should be set on the parent as well */ 247 static int 248 vlan_setflag(struct ifvlan *ifv, struct ifnet *ifp_p, int flag, int set, 249 int (*func)(struct ifnet *, int)) 250 { 251 struct ifnet *ifp = &ifv->ifv_if; 252 int error, ifv_flag; 253 254 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 255 256 ifv_flag = set ? (ifp->if_flags & flag) : 0; 257 258 /* 259 * See if recorded parent's status is different from what 260 * we want it to be. If it is, flip it. We record parent's 261 * status in ifv_pflags so that we won't clear parent's flag 262 * we haven't set. In fact, we don't clear or set parent's 263 * flags directly, but get or release references to them. 264 * That's why we can be sure that recorded flags still are 265 * in accord with actual parent's flags. 266 */ 267 if (ifv_flag != (ifv->ifv_pflags & flag)) { 268 error = func(ifp_p, ifv_flag); 269 if (error) 270 return error; 271 ifv->ifv_pflags &= ~flag; 272 ifv->ifv_pflags |= ifv_flag; 273 } 274 return 0; 275 } 276 277 /* 278 * Program our multicast filter. What we're actually doing is 279 * programming the multicast filter of the parent. This has the 280 * side effect of causing the parent interface to receive multicast 281 * traffic that it doesn't really want, which ends up being discarded 282 * later by the upper protocol layers. Unfortunately, there's no way 283 * to avoid this: there really is only one physical interface. 284 */ 285 static int 286 vlan_setmulti(struct ifvlan *ifv, struct ifnet *ifp_p) 287 { 288 struct ifmultiaddr *ifma; 289 struct vlan_mc_entry *mc = NULL; 290 struct sockaddr_dl sdl; 291 struct ifnet *ifp = &ifv->ifv_if; 292 293 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 294 295 /* 296 * First, remove any existing filter entries. 297 */ 298 vlan_clrmulti(ifv, ifp_p); 299 300 /* 301 * Save the filter entries to be added to parent. 302 * 303 * TODO: need ifnet_serialize_main 304 */ 305 ifnet_serialize_all(ifp); 306 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 307 if (ifma->ifma_addr->sa_family != AF_LINK) 308 continue; 309 310 /* Save a copy */ 311 mc = kmalloc(sizeof(struct vlan_mc_entry), M_VLAN, M_WAITOK); 312 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 313 &mc->mc_addr, ETHER_ADDR_LEN); 314 SLIST_INSERT_HEAD(&ifv->vlan_mc_listhead, mc, mc_entries); 315 } 316 ifnet_deserialize_all(ifp); 317 318 /* 319 * Now program new ones. 320 */ 321 bzero(&sdl, sizeof(sdl)); 322 sdl.sdl_len = sizeof(sdl); 323 sdl.sdl_family = AF_LINK; 324 sdl.sdl_index = ifp_p->if_index; 325 sdl.sdl_type = IFT_ETHER; 326 sdl.sdl_alen = ETHER_ADDR_LEN; 327 328 /* 329 * Program the parent multicast filter 330 */ 331 SLIST_FOREACH(mc, &ifv->vlan_mc_listhead, mc_entries) { 332 int error; 333 334 bcopy(&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 335 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, NULL); 336 if (error) { 337 /* XXX probably should keep going */ 338 return error; 339 } 340 } 341 return 0; 342 } 343 344 static void 345 vlan_clrmulti(struct ifvlan *ifv, struct ifnet *ifp_p) 346 { 347 struct vlan_mc_entry *mc; 348 struct sockaddr_dl sdl; 349 350 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 351 352 bzero(&sdl, sizeof(sdl)); 353 sdl.sdl_len = sizeof(sdl); 354 sdl.sdl_family = AF_LINK; 355 sdl.sdl_index = ifp_p->if_index; 356 sdl.sdl_type = IFT_ETHER; 357 sdl.sdl_alen = ETHER_ADDR_LEN; 358 359 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 360 bcopy(&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 361 if_delmulti(ifp_p, (struct sockaddr *)&sdl); /* ignore error */ 362 363 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 364 kfree(mc, M_VLAN); 365 } 366 } 367 368 static int 369 vlan_modevent(module_t mod, int type, void *data) 370 { 371 switch (type) { 372 case MOD_LOAD: 373 LIST_INIT(&ifv_list); 374 vlan_input_p = vlan_input; 375 vlan_ifdetach_cookie = 376 EVENTHANDLER_REGISTER(ifnet_detach_event, 377 vlan_ifdetach, NULL, 378 EVENTHANDLER_PRI_ANY); 379 if_clone_attach(&vlan_cloner); 380 break; 381 382 case MOD_UNLOAD: 383 if_clone_detach(&vlan_cloner); 384 385 vlan_input_p = NULL; 386 /* 387 * Make sure that all protocol threads see vlan_input_p change. 388 */ 389 netmsg_service_sync(); 390 391 EVENTHANDLER_DEREGISTER(ifnet_detach_event, 392 vlan_ifdetach_cookie); 393 while (!LIST_EMPTY(&ifv_list)) 394 vlan_clone_destroy(&LIST_FIRST(&ifv_list)->ifv_if); 395 break; 396 } 397 return 0; 398 } 399 400 static moduledata_t vlan_mod = { 401 "if_vlan", 402 vlan_modevent, 403 0 404 }; 405 406 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 407 408 static void 409 vlan_ifdetach_dispatch(netmsg_t msg) 410 { 411 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 412 struct ifnet *ifp_p = vmsg->nv_ifp_p; 413 struct vlan_trunk *vlantrunks, *trunk; 414 struct vlan_entry *ifve; 415 416 vlantrunks = ifp_p->if_vlantrunks; 417 if (vlantrunks == NULL) 418 goto reply; 419 trunk = &vlantrunks[mycpuid]; 420 421 while (ifp_p->if_vlantrunks && 422 (ifve = LIST_FIRST(&trunk->vlan_list)) != NULL) 423 vlan_unconfig(ifve->ifv); 424 reply: 425 lwkt_replymsg(&vmsg->base.lmsg, 0); 426 } 427 428 static void 429 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 430 { 431 struct netmsg_vlan vmsg; 432 433 ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp); 434 435 bzero(&vmsg, sizeof(vmsg)); 436 437 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 438 0, vlan_ifdetach_dispatch); 439 vmsg.nv_ifp_p = ifp; 440 441 lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 442 } 443 444 static int 445 vlan_clone_create(struct if_clone *ifc, int unit, caddr_t param __unused) 446 { 447 struct ifvlan *ifv; 448 struct ifnet *ifp; 449 int vlan_size, i; 450 451 vlan_size = sizeof(struct ifvlan) 452 + ((ncpus - 1) * sizeof(struct vlan_entry)); 453 ifv = kmalloc(vlan_size, M_VLAN, M_WAITOK | M_ZERO); 454 SLIST_INIT(&ifv->vlan_mc_listhead); 455 for (i = 0; i < ncpus; ++i) 456 ifv->ifv_entries[i].ifv = ifv; 457 458 crit_enter(); /* XXX not MP safe */ 459 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 460 crit_exit(); 461 462 ifp = &ifv->ifv_if; 463 ifp->if_softc = ifv; 464 if_initname(ifp, "vlan", unit); 465 /* NB: flags are not set here */ 466 ifp->if_linkmib = &ifv->ifv_mib; 467 ifp->if_linkmiblen = sizeof ifv->ifv_mib; 468 /* NB: mtu is not set here */ 469 470 ifp->if_init = vlan_init; 471 ifp->if_start = vlan_start; 472 ifp->if_ioctl = vlan_ioctl; 473 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 474 ifq_set_ready(&ifp->if_snd); 475 ether_ifattach(ifp, ifv->ifv_ac.ac_enaddr, NULL); 476 /* Now undo some of the damage... */ 477 ifp->if_data.ifi_type = IFT_L2VLAN; 478 ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN; 479 480 return (0); 481 } 482 483 static int 484 vlan_clone_destroy(struct ifnet *ifp) 485 { 486 struct ifvlan *ifv = ifp->if_softc; 487 488 crit_enter(); /* XXX not MP safe */ 489 LIST_REMOVE(ifv, ifv_list); 490 crit_exit(); 491 492 vlan_unconfig(ifv); 493 ether_ifdetach(ifp); 494 495 kfree(ifv, M_VLAN); 496 497 return 0; 498 } 499 500 static void 501 vlan_init(void *xsc) 502 { 503 struct ifvlan *ifv = xsc; 504 struct ifnet *ifp = &ifv->ifv_if; 505 506 ASSERT_IFNET_SERIALIZED_ALL(ifp); 507 508 if (ifv->ifv_p != NULL) 509 ifp->if_flags |= IFF_RUNNING; 510 } 511 512 static void 513 vlan_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 514 { 515 struct ifvlan *ifv = ifp->if_softc; 516 struct ifnet *ifp_p = ifv->ifv_p; 517 struct mbuf *m; 518 lwkt_port_t p_port; 519 520 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 521 ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq); 522 523 if (ifp_p == NULL) { 524 ifsq_purge(ifsq); 525 return; 526 } 527 528 if ((ifp->if_flags & IFF_RUNNING) == 0) 529 return; 530 531 p_port = netisr_cpuport( 532 ifsq_get_cpuid(ifq_get_subq_default(&ifp_p->if_snd))); 533 for (;;) { 534 struct netmsg_packet *nmp; 535 536 m = ifsq_dequeue(ifsq); 537 if (m == NULL) 538 break; 539 BPF_MTAP(ifp, m); 540 541 /* 542 * Do not run parent's if_start() if the parent is not up, 543 * or parent's driver will cause a system crash. 544 */ 545 if ((ifp_p->if_flags & (IFF_UP | IFF_RUNNING)) != 546 (IFF_UP | IFF_RUNNING)) { 547 m_freem(m); 548 IFNET_STAT_INC(ifp, collisions, 1); 549 continue; 550 } 551 552 /* 553 * We need some way to tell the interface where the packet 554 * came from so that it knows how to find the VLAN tag to 555 * use, so we set the ether_vlantag in the mbuf packet header 556 * to our vlan tag. We also set the M_VLANTAG flag in the 557 * mbuf to let the parent driver know that the ether_vlantag 558 * is really valid. 559 */ 560 m->m_pkthdr.ether_vlantag = ifv->ifv_tag; 561 m->m_flags |= M_VLANTAG; 562 563 nmp = &m->m_hdr.mh_netmsg; 564 565 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 566 0, vlan_start_dispatch); 567 nmp->nm_packet = m; 568 nmp->base.lmsg.u.ms_resultp = ifp_p; 569 570 lwkt_sendmsg(p_port, &nmp->base.lmsg); 571 IFNET_STAT_INC(ifp, opackets, 1); 572 } 573 } 574 575 static void 576 vlan_input(struct mbuf *m) 577 { 578 struct ifvlan *ifv = NULL; 579 struct ifnet *rcvif; 580 struct vlan_trunk *vlantrunks; 581 struct vlan_entry *entry; 582 583 rcvif = m->m_pkthdr.rcvif; 584 KKASSERT(m->m_flags & M_VLANTAG); 585 586 vlantrunks = rcvif->if_vlantrunks; 587 if (vlantrunks == NULL) { 588 IFNET_STAT_INC(rcvif, noproto, 1); 589 m_freem(m); 590 return; 591 } 592 593 crit_enter(); /* XXX Necessary? */ 594 LIST_FOREACH(entry, &vlantrunks[mycpuid].vlan_list, ifv_link) { 595 if (entry->ifv->ifv_tag == 596 EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag)) { 597 ifv = entry->ifv; 598 break; 599 } 600 } 601 crit_exit(); 602 603 /* 604 * Packet is discarded if: 605 * - no corresponding vlan(4) interface 606 * - vlan(4) interface has not been completely set up yet, 607 * or is being destroyed (ifv->ifv_p != rcvif) 608 */ 609 if (ifv == NULL || ifv->ifv_p != rcvif) { 610 IFNET_STAT_INC(rcvif, noproto, 1); 611 m_freem(m); 612 return; 613 } 614 615 /* 616 * Clear M_VLANTAG, before the packet is handed to 617 * vlan(4) interface 618 */ 619 m->m_flags &= ~M_VLANTAG; 620 621 ether_reinput_oncpu(&ifv->ifv_if, m, REINPUT_RUNBPF); 622 } 623 624 static void 625 vlan_link_dispatch(netmsg_t msg) 626 { 627 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 628 struct ifvlan *ifv = vmsg->nv_ifv; 629 struct ifnet *ifp_p = vmsg->nv_ifp_p; 630 struct vlan_entry *entry; 631 struct vlan_trunk *vlantrunks, *trunk; 632 int cpu = mycpuid; 633 634 vlantrunks = ifp_p->if_vlantrunks; 635 KASSERT(vlantrunks != NULL, 636 ("vlan trunk has not been initialized yet")); 637 638 entry = &ifv->ifv_entries[cpu]; 639 trunk = &vlantrunks[cpu]; 640 641 crit_enter(); 642 LIST_INSERT_HEAD(&trunk->vlan_list, entry, ifv_link); 643 crit_exit(); 644 645 ifnet_forwardmsg(&vmsg->base.lmsg, cpu + 1); 646 } 647 648 static void 649 vlan_link(struct ifvlan *ifv, struct ifnet *ifp_p) 650 { 651 struct netmsg_vlan vmsg; 652 653 /* Assert in netisr0 */ 654 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 655 656 if (ifp_p->if_vlantrunks == NULL) { 657 struct vlan_trunk *vlantrunks; 658 int i; 659 660 vlantrunks = kmalloc(sizeof(*vlantrunks) * ncpus, M_VLAN, 661 M_WAITOK | M_ZERO); 662 for (i = 0; i < ncpus; ++i) 663 LIST_INIT(&vlantrunks[i].vlan_list); 664 665 ifp_p->if_vlantrunks = vlantrunks; 666 } 667 668 bzero(&vmsg, sizeof(vmsg)); 669 670 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 671 0, vlan_link_dispatch); 672 vmsg.nv_ifv = ifv; 673 vmsg.nv_ifp_p = ifp_p; 674 675 ifnet_domsg(&vmsg.base.lmsg, 0); 676 } 677 678 static void 679 vlan_config_dispatch(netmsg_t msg) 680 { 681 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 682 struct ifvlan *ifv; 683 struct ifnet *ifp_p, *ifp; 684 struct sockaddr_dl *sdl1, *sdl2; 685 int error; 686 687 /* Assert in netisr0 */ 688 689 ifp_p = ifunit(vmsg->nv_parent_name); 690 if (ifp_p == NULL) { 691 error = ENOENT; 692 goto reply; 693 } 694 695 if (ifp_p->if_data.ifi_type != IFT_ETHER) { 696 error = EPROTONOSUPPORT; 697 goto reply; 698 } 699 700 ifv = vmsg->nv_ifv; 701 ifp = &ifv->ifv_if; 702 703 if (ifv->ifv_p) { 704 error = EBUSY; 705 goto reply; 706 } 707 708 /* Link vlan into parent's vlantrunk */ 709 vlan_link(ifv, ifp_p); 710 711 ifnet_serialize_all(ifp); 712 713 ifv->ifv_tag = vmsg->nv_vlantag; 714 if (ifp_p->if_capenable & IFCAP_VLAN_MTU) 715 ifp->if_mtu = ifp_p->if_mtu; 716 else 717 ifp->if_mtu = ifp_p->if_data.ifi_mtu - EVL_ENCAPLEN; 718 719 /* 720 * Copy only a selected subset of flags from the parent. 721 * Other flags are none of our business. 722 */ 723 #define VLAN_INHERIT_FLAGS (IFF_BROADCAST | IFF_MULTICAST | \ 724 IFF_SIMPLEX | IFF_POINTOPOINT) 725 726 ifp->if_flags &= ~VLAN_INHERIT_FLAGS; 727 ifp->if_flags |= (ifp_p->if_flags & VLAN_INHERIT_FLAGS); 728 729 #undef VLAN_INHERIT_FLAGS 730 731 /* 732 * Set up our ``Ethernet address'' to reflect the underlying 733 * physical interface's. 734 */ 735 sdl1 = IF_LLSOCKADDR(ifp); 736 sdl2 = IF_LLSOCKADDR(ifp_p); 737 sdl1->sdl_type = IFT_ETHER; 738 sdl1->sdl_alen = ETHER_ADDR_LEN; 739 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 740 bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 741 742 /* 743 * Release vlan's serializer before reprogramming parent's 744 * multicast filter to avoid possible dead lock. 745 */ 746 ifnet_deserialize_all(ifp); 747 748 /* 749 * Configure multicast addresses that may already be 750 * joined on the vlan device. 751 */ 752 vlan_setmulti(ifv, ifp_p); 753 754 /* 755 * Set flags on the parent, if necessary. 756 */ 757 vlan_setflags(ifv, ifp_p, 1); 758 759 /* 760 * Connect to parent after everything have been set up, 761 * so input/output could know that vlan is ready to go 762 */ 763 ifv->ifv_p = ifp_p; 764 error = 0; 765 reply: 766 lwkt_replymsg(&vmsg->base.lmsg, error); 767 } 768 769 static int 770 vlan_config(struct ifvlan *ifv, const char *parent_name, uint16_t vlantag) 771 { 772 struct netmsg_vlan vmsg; 773 774 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 775 776 bzero(&vmsg, sizeof(vmsg)); 777 778 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 779 0, vlan_config_dispatch); 780 vmsg.nv_ifv = ifv; 781 vmsg.nv_parent_name = parent_name; 782 vmsg.nv_vlantag = vlantag; 783 784 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 785 } 786 787 static void 788 vlan_unlink_dispatch(netmsg_t msg) 789 { 790 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 791 struct ifvlan *ifv = vmsg->nv_ifv; 792 struct vlan_entry *entry; 793 int cpu = mycpuid; 794 795 KASSERT(vmsg->nv_ifp_p->if_vlantrunks != NULL, 796 ("vlan trunk has not been initialized yet")); 797 entry = &ifv->ifv_entries[cpu]; 798 799 crit_enter(); 800 LIST_REMOVE(entry, ifv_link); 801 crit_exit(); 802 803 ifnet_forwardmsg(&vmsg->base.lmsg, cpu + 1); 804 } 805 806 static void 807 vlan_unlink(struct ifvlan *ifv, struct ifnet *ifp_p) 808 { 809 struct vlan_trunk *vlantrunks = ifp_p->if_vlantrunks; 810 struct netmsg_vlan vmsg; 811 812 /* Assert in netisr0 */ 813 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 814 815 KASSERT(ifp_p->if_vlantrunks != NULL, 816 ("vlan trunk has not been initialized yet")); 817 818 bzero(&vmsg, sizeof(vmsg)); 819 820 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 821 0, vlan_unlink_dispatch); 822 vmsg.nv_ifv = ifv; 823 vmsg.nv_ifp_p = ifp_p; 824 825 ifnet_domsg(&vmsg.base.lmsg, 0); 826 827 crit_enter(); 828 if (LIST_EMPTY(&vlantrunks[mycpuid].vlan_list)) { 829 ifp_p->if_vlantrunks = NULL; 830 831 /* 832 * Make sure that all protocol threads see if_vlantrunks change. 833 */ 834 netmsg_service_sync(); 835 kfree(vlantrunks, M_VLAN); 836 } 837 crit_exit(); 838 } 839 840 static void 841 vlan_unconfig_dispatch(netmsg_t msg) 842 { 843 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 844 struct sockaddr_dl *sdl; 845 struct ifvlan *ifv; 846 struct ifnet *ifp_p, *ifp; 847 int error; 848 849 /* Assert in netisr0 */ 850 851 ifv = vmsg->nv_ifv; 852 ifp = &ifv->ifv_if; 853 854 if (ifp->if_flags & IFF_UP) 855 if_down(ifp); 856 857 ifnet_serialize_all(ifp); 858 859 ifp->if_flags &= ~IFF_RUNNING; 860 861 /* 862 * Save parent ifnet pointer and disconnect from parent. 863 * 864 * This is done early in this function, so input/output could 865 * know that we are disconnecting. 866 */ 867 ifp_p = ifv->ifv_p; 868 ifv->ifv_p = NULL; 869 870 /* 871 * Release vlan's serializer before reprogramming parent's 872 * multicast filter to avoid possible dead lock. 873 */ 874 ifnet_deserialize_all(ifp); 875 876 if (ifp_p) { 877 /* 878 * Since the interface is being unconfigured, we need to 879 * empty the list of multicast groups that we may have joined 880 * while we were alive from the parent's list. 881 */ 882 vlan_clrmulti(ifv, ifp_p); 883 884 /* Clear parent's flags which was set by us. */ 885 vlan_setflags(ifv, ifp_p, 0); 886 } 887 888 ifnet_serialize_all(ifp); 889 890 ifp->if_mtu = ETHERMTU; 891 892 /* Clear our MAC address. */ 893 sdl = IF_LLSOCKADDR(ifp); 894 sdl->sdl_type = IFT_ETHER; 895 sdl->sdl_alen = ETHER_ADDR_LEN; 896 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 897 bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 898 899 ifnet_deserialize_all(ifp); 900 901 /* Unlink vlan from parent's vlantrunk */ 902 if (ifp_p != NULL && ifp_p->if_vlantrunks != NULL) 903 vlan_unlink(ifv, ifp_p); 904 905 error = 0; 906 lwkt_replymsg(&vmsg->base.lmsg, error); 907 } 908 909 static int 910 vlan_unconfig(struct ifvlan *ifv) 911 { 912 struct netmsg_vlan vmsg; 913 914 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 915 916 bzero(&vmsg, sizeof(vmsg)); 917 918 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 919 0, vlan_unconfig_dispatch); 920 vmsg.nv_ifv = ifv; 921 922 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 923 } 924 925 static int 926 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 927 { 928 struct ifvlan *ifv = ifp->if_softc; 929 struct ifreq *ifr = (struct ifreq *)data; 930 struct ifnet *ifp_p; 931 struct vlanreq vlr; 932 int error = 0; 933 934 ASSERT_IFNET_SERIALIZED_ALL(ifp); 935 936 switch (cmd) { 937 case SIOCGIFMEDIA: 938 ifp_p = ifv->ifv_p; 939 if (ifp_p != NULL) { 940 /* 941 * Release vlan interface's serializer to void 942 * possible dead lock. 943 */ 944 ifnet_deserialize_all(ifp); 945 946 ifnet_serialize_all(ifp_p); 947 error = ifp_p->if_ioctl(ifp_p, SIOCGIFMEDIA, data, cr); 948 ifnet_deserialize_all(ifp_p); 949 950 ifnet_serialize_all(ifp); 951 952 if (ifv->ifv_p == NULL || ifv->ifv_p != ifp_p) { 953 /* 954 * We are disconnected from the original 955 * parent interface or the parent interface 956 * is changed, after vlan interface's 957 * serializer is released. 958 */ 959 error = EINVAL; 960 } 961 962 /* Limit the result to the parent's current config. */ 963 if (error == 0) { 964 struct ifmediareq *ifmr; 965 966 ifmr = (struct ifmediareq *) data; 967 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 968 ifmr->ifm_count = 1; 969 error = copyout(&ifmr->ifm_current, 970 ifmr->ifm_ulist, 971 sizeof(int)); 972 } 973 } 974 } else { 975 error = EINVAL; 976 } 977 break; 978 979 case SIOCSIFMEDIA: 980 error = EINVAL; 981 break; 982 983 case SIOCSETVLAN: 984 error = copyin(ifr->ifr_data, &vlr, sizeof vlr); 985 if (error) 986 break; 987 988 ifnet_deserialize_all(ifp); 989 if (vlr.vlr_parent[0] == '\0') 990 error = vlan_unconfig(ifv); 991 else 992 error = vlan_config(ifv, vlr.vlr_parent, vlr.vlr_tag); 993 ifnet_serialize_all(ifp); 994 break; 995 996 case SIOCGETVLAN: 997 bzero(&vlr, sizeof(vlr)); 998 if (ifv->ifv_p) { 999 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname, 1000 sizeof(vlr.vlr_parent)); 1001 vlr.vlr_tag = ifv->ifv_tag; 1002 } 1003 error = copyout(&vlr, ifr->ifr_data, sizeof vlr); 1004 break; 1005 1006 case SIOCSIFFLAGS: 1007 if (ifp->if_flags & IFF_UP) 1008 ifp->if_init(ifp); 1009 else 1010 ifp->if_flags &= ~IFF_RUNNING; 1011 1012 /* 1013 * We should propagate selected flags to the parent, 1014 * e.g., promiscuous mode. 1015 */ 1016 ifnet_deserialize_all(ifp); 1017 error = vlan_config_flags(ifv); 1018 ifnet_serialize_all(ifp); 1019 break; 1020 1021 case SIOCADDMULTI: 1022 case SIOCDELMULTI: 1023 ifnet_deserialize_all(ifp); 1024 error = vlan_config_multi(ifv); 1025 ifnet_serialize_all(ifp); 1026 break; 1027 1028 default: 1029 error = ether_ioctl(ifp, cmd, data); 1030 break; 1031 } 1032 return error; 1033 } 1034 1035 static void 1036 vlan_multi_dispatch(netmsg_t msg) 1037 { 1038 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1039 struct ifvlan *ifv = vmsg->nv_ifv; 1040 int error = 0; 1041 1042 /* 1043 * If we don't have a parent, just remember the membership for 1044 * when we do. 1045 */ 1046 if (ifv->ifv_p != NULL) 1047 error = vlan_setmulti(ifv, ifv->ifv_p); 1048 lwkt_replymsg(&vmsg->base.lmsg, error); 1049 } 1050 1051 static int 1052 vlan_config_multi(struct ifvlan *ifv) 1053 { 1054 struct netmsg_vlan vmsg; 1055 1056 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1057 1058 bzero(&vmsg, sizeof(vmsg)); 1059 1060 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1061 0, vlan_multi_dispatch); 1062 vmsg.nv_ifv = ifv; 1063 1064 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1065 } 1066 1067 static void 1068 vlan_flags_dispatch(netmsg_t msg) 1069 { 1070 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1071 struct ifvlan *ifv = vmsg->nv_ifv; 1072 int error = 0; 1073 1074 /* 1075 * If we don't have a parent, just remember the flags for 1076 * when we do. 1077 */ 1078 if (ifv->ifv_p != NULL) 1079 error = vlan_setflags(ifv, ifv->ifv_p, 1); 1080 lwkt_replymsg(&vmsg->base.lmsg, error); 1081 } 1082 1083 static int 1084 vlan_config_flags(struct ifvlan *ifv) 1085 { 1086 struct netmsg_vlan vmsg; 1087 1088 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1089 1090 bzero(&vmsg, sizeof(vmsg)); 1091 1092 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1093 0, vlan_flags_dispatch); 1094 vmsg.nv_ifv = ifv; 1095 1096 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1097 } 1098