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); 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, caddr_t param __unused) 447 { 448 struct ifvlan *ifv; 449 struct ifnet *ifp; 450 int vlan_size, i; 451 452 vlan_size = sizeof(struct ifvlan) 453 + ((netisr_ncpus - 1) * sizeof(struct vlan_entry)); 454 ifv = kmalloc(vlan_size, M_VLAN, M_WAITOK | M_ZERO); 455 SLIST_INIT(&ifv->vlan_mc_listhead); 456 for (i = 0; i < netisr_ncpus; ++i) 457 ifv->ifv_entries[i].ifv = ifv; 458 459 crit_enter(); /* XXX not MP safe */ 460 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 461 crit_exit(); 462 463 ifp = &ifv->ifv_if; 464 ifp->if_softc = ifv; 465 if_initname(ifp, "vlan", unit); 466 /* NB: flags are not set here */ 467 ifp->if_linkmib = &ifv->ifv_mib; 468 ifp->if_linkmiblen = sizeof ifv->ifv_mib; 469 /* NB: mtu is not set here */ 470 471 ifp->if_init = vlan_init; 472 ifp->if_start = vlan_start; 473 ifp->if_ioctl = vlan_ioctl; 474 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 475 ifq_set_ready(&ifp->if_snd); 476 ether_ifattach(ifp, ifv->ifv_ac.ac_enaddr, NULL); 477 /* Now undo some of the damage... */ 478 ifp->if_data.ifi_type = IFT_L2VLAN; 479 ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN; 480 481 return (0); 482 } 483 484 static int 485 vlan_clone_destroy(struct ifnet *ifp) 486 { 487 struct ifvlan *ifv = ifp->if_softc; 488 489 crit_enter(); /* XXX not MP safe */ 490 LIST_REMOVE(ifv, ifv_list); 491 crit_exit(); 492 493 vlan_unconfig(ifv); 494 ether_ifdetach(ifp); 495 496 kfree(ifv, M_VLAN); 497 498 return 0; 499 } 500 501 static void 502 vlan_init(void *xsc) 503 { 504 struct ifvlan *ifv = xsc; 505 struct ifnet *ifp = &ifv->ifv_if; 506 507 ASSERT_IFNET_SERIALIZED_ALL(ifp); 508 509 if (ifv->ifv_p != NULL) 510 ifp->if_flags |= IFF_RUNNING; 511 } 512 513 static void 514 vlan_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 515 { 516 struct ifvlan *ifv = ifp->if_softc; 517 struct ifnet *ifp_p = ifv->ifv_p; 518 struct mbuf *m; 519 lwkt_port_t p_port; 520 521 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 522 ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq); 523 524 if (ifp_p == NULL) { 525 ifsq_purge(ifsq); 526 return; 527 } 528 529 if ((ifp->if_flags & IFF_RUNNING) == 0) 530 return; 531 532 p_port = netisr_cpuport( 533 ifsq_get_cpuid(ifq_get_subq_default(&ifp_p->if_snd))); 534 for (;;) { 535 struct netmsg_packet *nmp; 536 537 m = ifsq_dequeue(ifsq); 538 if (m == NULL) 539 break; 540 BPF_MTAP(ifp, m); 541 542 /* 543 * Do not run parent's if_start() if the parent is not up, 544 * or parent's driver will cause a system crash. 545 */ 546 if ((ifp_p->if_flags & (IFF_UP | IFF_RUNNING)) != 547 (IFF_UP | IFF_RUNNING)) { 548 m_freem(m); 549 IFNET_STAT_INC(ifp, collisions, 1); 550 continue; 551 } 552 553 /* 554 * We need some way to tell the interface where the packet 555 * came from so that it knows how to find the VLAN tag to 556 * use, so we set the ether_vlantag in the mbuf packet header 557 * to our vlan tag. We also set the M_VLANTAG flag in the 558 * mbuf to let the parent driver know that the ether_vlantag 559 * is really valid. 560 */ 561 m->m_pkthdr.ether_vlantag = ifv->ifv_tag; 562 m->m_flags |= M_VLANTAG; 563 564 nmp = &m->m_hdr.mh_netmsg; 565 566 netmsg_init(&nmp->base, NULL, &netisr_apanic_rport, 567 0, vlan_start_dispatch); 568 nmp->nm_packet = m; 569 nmp->base.lmsg.u.ms_resultp = ifp_p; 570 571 lwkt_sendmsg(p_port, &nmp->base.lmsg); 572 IFNET_STAT_INC(ifp, opackets, 1); 573 } 574 } 575 576 static void 577 vlan_input(struct mbuf *m) 578 { 579 struct ifvlan *ifv = NULL; 580 struct ifnet *rcvif; 581 struct vlan_trunk *vlantrunks; 582 struct vlan_entry *entry; 583 int cpuid = mycpuid; 584 585 ASSERT_NETISR_NCPUS(cpuid); 586 587 rcvif = m->m_pkthdr.rcvif; 588 KKASSERT(m->m_flags & M_VLANTAG); 589 590 vlantrunks = rcvif->if_vlantrunks; 591 /* Make sure 'vlantrunks' is really used. */ 592 cpu_ccfence(); 593 if (vlantrunks == NULL) { 594 IFNET_STAT_INC(rcvif, noproto, 1); 595 m_freem(m); 596 return; 597 } 598 599 crit_enter(); /* XXX Necessary? */ 600 LIST_FOREACH(entry, &vlantrunks[cpuid].vlan_list, ifv_link) { 601 if (entry->ifv->ifv_tag == 602 EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag)) { 603 ifv = entry->ifv; 604 break; 605 } 606 } 607 crit_exit(); 608 609 /* 610 * Packet is discarded if: 611 * - no corresponding vlan(4) interface 612 * - vlan(4) interface has not been completely set up yet, 613 * or is being destroyed (ifv->ifv_p != rcvif) 614 */ 615 if (ifv == NULL || ifv->ifv_p != rcvif) { 616 IFNET_STAT_INC(rcvif, noproto, 1); 617 m_freem(m); 618 return; 619 } 620 621 /* 622 * Clear M_VLANTAG, before the packet is handed to 623 * vlan(4) interface 624 */ 625 m->m_flags &= ~M_VLANTAG; 626 627 ether_reinput_oncpu(&ifv->ifv_if, m, REINPUT_RUNBPF); 628 } 629 630 static void 631 vlan_link_dispatch(netmsg_t msg) 632 { 633 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 634 struct ifvlan *ifv = vmsg->nv_ifv; 635 struct ifnet *ifp_p = vmsg->nv_ifp_p; 636 struct vlan_entry *entry; 637 struct vlan_trunk *vlantrunks, *trunk; 638 int cpu = mycpuid; 639 640 vlantrunks = ifp_p->if_vlantrunks; 641 KASSERT(vlantrunks != NULL, 642 ("vlan trunk has not been initialized yet")); 643 644 entry = &ifv->ifv_entries[cpu]; 645 trunk = &vlantrunks[cpu]; 646 647 crit_enter(); 648 LIST_INSERT_HEAD(&trunk->vlan_list, entry, ifv_link); 649 crit_exit(); 650 651 netisr_forwardmsg(&vmsg->base, cpu + 1); 652 } 653 654 static void 655 vlan_link(struct ifvlan *ifv, struct ifnet *ifp_p) 656 { 657 struct netmsg_vlan vmsg; 658 659 /* Assert in netisr0 */ 660 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 661 662 if (ifp_p->if_vlantrunks == NULL) { 663 struct vlan_trunk *vlantrunks; 664 int i; 665 666 vlantrunks = kmalloc(sizeof(*vlantrunks) * netisr_ncpus, M_VLAN, 667 M_WAITOK | M_ZERO); 668 for (i = 0; i < netisr_ncpus; ++i) 669 LIST_INIT(&vlantrunks[i].vlan_list); 670 671 ifp_p->if_vlantrunks = vlantrunks; 672 } 673 674 bzero(&vmsg, sizeof(vmsg)); 675 676 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 677 0, vlan_link_dispatch); 678 vmsg.nv_ifv = ifv; 679 vmsg.nv_ifp_p = ifp_p; 680 681 netisr_domsg(&vmsg.base, 0); 682 } 683 684 static void 685 vlan_config_dispatch(netmsg_t msg) 686 { 687 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 688 struct ifvlan *ifv; 689 struct ifnet *ifp_p, *ifp; 690 struct sockaddr_dl *sdl1, *sdl2; 691 int error; 692 693 /* Assert in netisr0 */ 694 695 ifp_p = ifunit_netisr(vmsg->nv_parent_name); 696 if (ifp_p == NULL) { 697 error = ENOENT; 698 goto reply; 699 } 700 701 if (ifp_p->if_data.ifi_type != IFT_ETHER) { 702 error = EPROTONOSUPPORT; 703 goto reply; 704 } 705 706 ifv = vmsg->nv_ifv; 707 ifp = &ifv->ifv_if; 708 709 if (ifv->ifv_p) { 710 error = EBUSY; 711 goto reply; 712 } 713 714 /* Link vlan into parent's vlantrunk */ 715 vlan_link(ifv, ifp_p); 716 717 ifnet_serialize_all(ifp); 718 719 ifv->ifv_tag = vmsg->nv_vlantag; 720 if (ifp_p->if_capenable & IFCAP_VLAN_MTU) 721 ifp->if_mtu = ifp_p->if_mtu; 722 else 723 ifp->if_mtu = ifp_p->if_data.ifi_mtu - EVL_ENCAPLEN; 724 725 /* 726 * Copy only a selected subset of flags from the parent. 727 * Other flags are none of our business. 728 */ 729 #define VLAN_INHERIT_FLAGS (IFF_BROADCAST | IFF_MULTICAST | \ 730 IFF_SIMPLEX | IFF_POINTOPOINT) 731 732 ifp->if_flags &= ~VLAN_INHERIT_FLAGS; 733 ifp->if_flags |= (ifp_p->if_flags & VLAN_INHERIT_FLAGS); 734 735 #undef VLAN_INHERIT_FLAGS 736 737 /* 738 * Set up our ``Ethernet address'' to reflect the underlying 739 * physical interface's. 740 */ 741 sdl1 = IF_LLSOCKADDR(ifp); 742 sdl2 = IF_LLSOCKADDR(ifp_p); 743 sdl1->sdl_type = IFT_ETHER; 744 sdl1->sdl_alen = ETHER_ADDR_LEN; 745 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 746 bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 747 748 /* 749 * Release vlan's serializer before reprogramming parent's 750 * multicast filter to avoid possible dead lock. 751 */ 752 ifnet_deserialize_all(ifp); 753 754 /* 755 * Configure multicast addresses that may already be 756 * joined on the vlan device. 757 */ 758 vlan_setmulti(ifv, ifp_p); 759 760 /* 761 * Set flags on the parent, if necessary. 762 */ 763 vlan_setflags(ifv, ifp_p, 1); 764 765 /* 766 * Connect to parent after everything have been set up, 767 * so input/output could know that vlan is ready to go 768 */ 769 ifv->ifv_p = ifp_p; 770 error = 0; 771 reply: 772 lwkt_replymsg(&vmsg->base.lmsg, error); 773 } 774 775 static int 776 vlan_config(struct ifvlan *ifv, const char *parent_name, uint16_t vlantag) 777 { 778 struct netmsg_vlan vmsg; 779 780 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 781 782 bzero(&vmsg, sizeof(vmsg)); 783 784 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 785 0, vlan_config_dispatch); 786 vmsg.nv_ifv = ifv; 787 vmsg.nv_parent_name = parent_name; 788 vmsg.nv_vlantag = vlantag; 789 790 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 791 } 792 793 static void 794 vlan_unlink_dispatch(netmsg_t msg) 795 { 796 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 797 struct ifvlan *ifv = vmsg->nv_ifv; 798 struct vlan_entry *entry; 799 int cpu = mycpuid; 800 801 KASSERT(vmsg->nv_ifp_p->if_vlantrunks != NULL, 802 ("vlan trunk has not been initialized yet")); 803 entry = &ifv->ifv_entries[cpu]; 804 805 crit_enter(); 806 LIST_REMOVE(entry, ifv_link); 807 crit_exit(); 808 809 netisr_forwardmsg(&vmsg->base, cpu + 1); 810 } 811 812 static void 813 vlan_unlink(struct ifvlan *ifv, struct ifnet *ifp_p) 814 { 815 struct vlan_trunk *vlantrunks = ifp_p->if_vlantrunks; 816 struct netmsg_vlan vmsg; 817 818 /* Assert in netisr0 */ 819 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 820 821 KASSERT(ifp_p->if_vlantrunks != NULL, 822 ("vlan trunk has not been initialized yet")); 823 824 bzero(&vmsg, sizeof(vmsg)); 825 826 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 827 0, vlan_unlink_dispatch); 828 vmsg.nv_ifv = ifv; 829 vmsg.nv_ifp_p = ifp_p; 830 831 netisr_domsg(&vmsg.base, 0); 832 833 crit_enter(); 834 if (LIST_EMPTY(&vlantrunks[mycpuid].vlan_list)) { 835 ifp_p->if_vlantrunks = NULL; 836 837 /* 838 * Make sure that all protocol threads see if_vlantrunks change. 839 */ 840 netmsg_service_sync(); 841 kfree(vlantrunks, M_VLAN); 842 } 843 crit_exit(); 844 } 845 846 static void 847 vlan_unconfig_dispatch(netmsg_t msg) 848 { 849 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 850 struct sockaddr_dl *sdl; 851 struct ifvlan *ifv; 852 struct ifnet *ifp_p, *ifp; 853 int error; 854 855 /* Assert in netisr0 */ 856 857 ifv = vmsg->nv_ifv; 858 ifp = &ifv->ifv_if; 859 860 if (ifp->if_flags & IFF_UP) 861 if_down(ifp); 862 863 ifnet_serialize_all(ifp); 864 865 ifp->if_flags &= ~IFF_RUNNING; 866 867 /* 868 * Save parent ifnet pointer and disconnect from parent. 869 * 870 * This is done early in this function, so input/output could 871 * know that we are disconnecting. 872 */ 873 ifp_p = ifv->ifv_p; 874 ifv->ifv_p = NULL; 875 876 /* 877 * Release vlan's serializer before reprogramming parent's 878 * multicast filter to avoid possible dead lock. 879 */ 880 ifnet_deserialize_all(ifp); 881 882 if (ifp_p) { 883 /* 884 * Since the interface is being unconfigured, we need to 885 * empty the list of multicast groups that we may have joined 886 * while we were alive from the parent's list. 887 */ 888 vlan_clrmulti(ifv, ifp_p); 889 890 /* Clear parent's flags which was set by us. */ 891 vlan_setflags(ifv, ifp_p, 0); 892 } 893 894 ifnet_serialize_all(ifp); 895 896 ifp->if_mtu = ETHERMTU; 897 898 /* Clear our MAC address. */ 899 sdl = IF_LLSOCKADDR(ifp); 900 sdl->sdl_type = IFT_ETHER; 901 sdl->sdl_alen = ETHER_ADDR_LEN; 902 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 903 bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 904 905 ifnet_deserialize_all(ifp); 906 907 /* Unlink vlan from parent's vlantrunk */ 908 if (ifp_p != NULL && ifp_p->if_vlantrunks != NULL) 909 vlan_unlink(ifv, ifp_p); 910 911 error = 0; 912 lwkt_replymsg(&vmsg->base.lmsg, error); 913 } 914 915 static int 916 vlan_unconfig(struct ifvlan *ifv) 917 { 918 struct netmsg_vlan vmsg; 919 920 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 921 922 bzero(&vmsg, sizeof(vmsg)); 923 924 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 925 0, vlan_unconfig_dispatch); 926 vmsg.nv_ifv = ifv; 927 928 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 929 } 930 931 static int 932 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 933 { 934 struct ifvlan *ifv = ifp->if_softc; 935 struct ifreq *ifr = (struct ifreq *)data; 936 struct ifnet *ifp_p; 937 struct vlanreq vlr; 938 int error = 0; 939 940 ASSERT_IFNET_SERIALIZED_ALL(ifp); 941 942 switch (cmd) { 943 case SIOCGIFMEDIA: 944 ifp_p = ifv->ifv_p; 945 if (ifp_p != NULL) { 946 /* 947 * Release vlan interface's serializer to void 948 * possible dead lock. 949 */ 950 ifnet_deserialize_all(ifp); 951 952 ifnet_serialize_all(ifp_p); 953 error = ifp_p->if_ioctl(ifp_p, SIOCGIFMEDIA, data, cr); 954 ifnet_deserialize_all(ifp_p); 955 956 ifnet_serialize_all(ifp); 957 958 if (ifv->ifv_p == NULL || ifv->ifv_p != ifp_p) { 959 /* 960 * We are disconnected from the original 961 * parent interface or the parent interface 962 * is changed, after vlan interface's 963 * serializer is released. 964 */ 965 error = EINVAL; 966 } 967 968 /* Limit the result to the parent's current config. */ 969 if (error == 0) { 970 struct ifmediareq *ifmr; 971 972 ifmr = (struct ifmediareq *) data; 973 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 974 ifmr->ifm_count = 1; 975 error = copyout(&ifmr->ifm_current, 976 ifmr->ifm_ulist, 977 sizeof(int)); 978 } 979 } 980 } else { 981 error = EINVAL; 982 } 983 break; 984 985 case SIOCSIFMEDIA: 986 error = EINVAL; 987 break; 988 989 case SIOCSETVLAN: 990 error = copyin(ifr->ifr_data, &vlr, sizeof vlr); 991 if (error) 992 break; 993 994 ifnet_deserialize_all(ifp); 995 if (vlr.vlr_parent[0] == '\0') 996 error = vlan_unconfig(ifv); 997 else 998 error = vlan_config(ifv, vlr.vlr_parent, vlr.vlr_tag); 999 ifnet_serialize_all(ifp); 1000 break; 1001 1002 case SIOCGETVLAN: 1003 bzero(&vlr, sizeof(vlr)); 1004 if (ifv->ifv_p) { 1005 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname, 1006 sizeof(vlr.vlr_parent)); 1007 vlr.vlr_tag = ifv->ifv_tag; 1008 } 1009 error = copyout(&vlr, ifr->ifr_data, sizeof vlr); 1010 break; 1011 1012 case SIOCSIFFLAGS: 1013 if (ifp->if_flags & IFF_UP) 1014 ifp->if_init(ifp); 1015 else 1016 ifp->if_flags &= ~IFF_RUNNING; 1017 1018 /* 1019 * We should propagate selected flags to the parent, 1020 * e.g., promiscuous mode. 1021 */ 1022 ifnet_deserialize_all(ifp); 1023 error = vlan_config_flags(ifv); 1024 ifnet_serialize_all(ifp); 1025 break; 1026 1027 case SIOCADDMULTI: 1028 case SIOCDELMULTI: 1029 ifnet_deserialize_all(ifp); 1030 error = vlan_config_multi(ifv); 1031 ifnet_serialize_all(ifp); 1032 break; 1033 1034 default: 1035 error = ether_ioctl(ifp, cmd, data); 1036 break; 1037 } 1038 return error; 1039 } 1040 1041 static void 1042 vlan_multi_dispatch(netmsg_t msg) 1043 { 1044 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1045 struct ifvlan *ifv = vmsg->nv_ifv; 1046 int error = 0; 1047 1048 /* 1049 * If we don't have a parent, just remember the membership for 1050 * when we do. 1051 */ 1052 if (ifv->ifv_p != NULL) 1053 error = vlan_setmulti(ifv, ifv->ifv_p); 1054 lwkt_replymsg(&vmsg->base.lmsg, error); 1055 } 1056 1057 static int 1058 vlan_config_multi(struct ifvlan *ifv) 1059 { 1060 struct netmsg_vlan vmsg; 1061 1062 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1063 1064 bzero(&vmsg, sizeof(vmsg)); 1065 1066 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1067 0, vlan_multi_dispatch); 1068 vmsg.nv_ifv = ifv; 1069 1070 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1071 } 1072 1073 static void 1074 vlan_flags_dispatch(netmsg_t msg) 1075 { 1076 struct netmsg_vlan *vmsg = (struct netmsg_vlan *)msg; 1077 struct ifvlan *ifv = vmsg->nv_ifv; 1078 int error = 0; 1079 1080 /* 1081 * If we don't have a parent, just remember the flags for 1082 * when we do. 1083 */ 1084 if (ifv->ifv_p != NULL) 1085 error = vlan_setflags(ifv, ifv->ifv_p, 1); 1086 lwkt_replymsg(&vmsg->base.lmsg, error); 1087 } 1088 1089 static int 1090 vlan_config_flags(struct ifvlan *ifv) 1091 { 1092 struct netmsg_vlan vmsg; 1093 1094 ASSERT_IFNET_NOT_SERIALIZED_ALL(&ifv->ifv_if); 1095 1096 bzero(&vmsg, sizeof(vmsg)); 1097 1098 netmsg_init(&vmsg.base, NULL, &curthread->td_msgport, 1099 0, vlan_flags_dispatch); 1100 vmsg.nv_ifv = ifv; 1101 1102 return lwkt_domsg(netisr_cpuport(0), &vmsg.base.lmsg, 0); 1103 } 1104