if_vlan.c revision 1.153.6.1
1 /* $NetBSD: if_vlan.c,v 1.153.6.1 2021/06/17 04:46:35 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2000, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran, and by Jason R. Thorpe of Zembu Labs, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright 1998 Massachusetts Institute of Technology 34 * 35 * Permission to use, copy, modify, and distribute this software and 36 * its documentation for any purpose and without fee is hereby 37 * granted, provided that both the above copyright notice and this 38 * permission notice appear in all copies, that both the above 39 * copyright notice and this permission notice appear in all 40 * supporting documentation, and that the name of M.I.T. not be used 41 * in advertising or publicity pertaining to distribution of the 42 * software without specific, written prior permission. M.I.T. makes 43 * no representations about the suitability of this software for any 44 * purpose. It is provided "as is" without express or implied 45 * warranty. 46 * 47 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 48 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 49 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 50 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 51 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 52 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 53 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 54 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 55 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 56 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 57 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * from FreeBSD: if_vlan.c,v 1.16 2000/03/26 15:21:40 charnier Exp 61 * via OpenBSD: if_vlan.c,v 1.4 2000/05/15 19:15:00 chris Exp 62 */ 63 64 /* 65 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. Might be 66 * extended some day to also handle IEEE 802.1P priority tagging. This is 67 * sort of sneaky in the implementation, since we need to pretend to be 68 * enough of an Ethernet implementation to make ARP work. The way we do 69 * this is by telling everyone that we are an Ethernet interface, and then 70 * catch the packets that ether_output() left on our output queue when it 71 * calls if_start(), rewrite them for use by the real outgoing interface, 72 * and ask it to send them. 73 * 74 * TODO: 75 * 76 * - Need some way to notify vlan interfaces when the parent 77 * interface changes MTU. 78 */ 79 80 #include <sys/cdefs.h> 81 __KERNEL_RCSID(0, "$NetBSD: if_vlan.c,v 1.153.6.1 2021/06/17 04:46:35 thorpej Exp $"); 82 83 #ifdef _KERNEL_OPT 84 #include "opt_inet.h" 85 #include "opt_net_mpsafe.h" 86 #endif 87 88 #include <sys/param.h> 89 #include <sys/systm.h> 90 #include <sys/kernel.h> 91 #include <sys/mbuf.h> 92 #include <sys/queue.h> 93 #include <sys/socket.h> 94 #include <sys/sockio.h> 95 #include <sys/systm.h> 96 #include <sys/proc.h> 97 #include <sys/kauth.h> 98 #include <sys/mutex.h> 99 #include <sys/kmem.h> 100 #include <sys/cpu.h> 101 #include <sys/pserialize.h> 102 #include <sys/psref.h> 103 #include <sys/pslist.h> 104 #include <sys/atomic.h> 105 #include <sys/device.h> 106 #include <sys/module.h> 107 108 #include <net/bpf.h> 109 #include <net/if.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_ether.h> 113 #include <net/if_vlanvar.h> 114 115 #ifdef INET 116 #include <netinet/in.h> 117 #include <netinet/if_inarp.h> 118 #endif 119 #ifdef INET6 120 #include <netinet6/in6_ifattach.h> 121 #include <netinet6/in6_var.h> 122 #include <netinet6/nd6.h> 123 #endif 124 125 #include "ioconf.h" 126 127 struct vlan_mc_entry { 128 LIST_ENTRY(vlan_mc_entry) mc_entries; 129 /* 130 * A key to identify this entry. The mc_addr below can't be 131 * used since multiple sockaddr may mapped into the same 132 * ether_multi (e.g., AF_UNSPEC). 133 */ 134 struct ether_multi *mc_enm; 135 struct sockaddr_storage mc_addr; 136 }; 137 138 struct ifvlan_linkmib { 139 struct ifvlan *ifvm_ifvlan; 140 const struct vlan_multisw *ifvm_msw; 141 int ifvm_encaplen; /* encapsulation length */ 142 int ifvm_mtufudge; /* MTU fudged by this much */ 143 int ifvm_mintu; /* min transmission unit */ 144 uint16_t ifvm_proto; /* encapsulation ethertype */ 145 uint16_t ifvm_tag; /* tag to apply on packets */ 146 struct ifnet *ifvm_p; /* parent interface of this vlan */ 147 148 struct psref_target ifvm_psref; 149 }; 150 151 struct ifvlan { 152 struct ethercom ifv_ec; 153 struct ifvlan_linkmib *ifv_mib; /* 154 * reader must use vlan_getref_linkmib() 155 * instead of direct dereference 156 */ 157 kmutex_t ifv_lock; /* writer lock for ifv_mib */ 158 pserialize_t ifv_psz; 159 160 LIST_HEAD(__vlan_mchead, vlan_mc_entry) ifv_mc_listhead; 161 LIST_ENTRY(ifvlan) ifv_list; 162 struct pslist_entry ifv_hash; 163 int ifv_flags; 164 }; 165 166 #define IFVF_PROMISC 0x01 /* promiscuous mode enabled */ 167 168 #define ifv_if ifv_ec.ec_if 169 170 #define ifv_msw ifv_mib.ifvm_msw 171 #define ifv_encaplen ifv_mib.ifvm_encaplen 172 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 173 #define ifv_mintu ifv_mib.ifvm_mintu 174 #define ifv_tag ifv_mib.ifvm_tag 175 176 struct vlan_multisw { 177 int (*vmsw_addmulti)(struct ifvlan *, struct ifreq *); 178 int (*vmsw_delmulti)(struct ifvlan *, struct ifreq *); 179 void (*vmsw_purgemulti)(struct ifvlan *); 180 }; 181 182 static int vlan_ether_addmulti(struct ifvlan *, struct ifreq *); 183 static int vlan_ether_delmulti(struct ifvlan *, struct ifreq *); 184 static void vlan_ether_purgemulti(struct ifvlan *); 185 186 const struct vlan_multisw vlan_ether_multisw = { 187 .vmsw_addmulti = vlan_ether_addmulti, 188 .vmsw_delmulti = vlan_ether_delmulti, 189 .vmsw_purgemulti = vlan_ether_purgemulti, 190 }; 191 192 static int vlan_clone_create(struct if_clone *, int); 193 static int vlan_clone_destroy(struct ifnet *); 194 static int vlan_config(struct ifvlan *, struct ifnet *, uint16_t); 195 static int vlan_ioctl(struct ifnet *, u_long, void *); 196 static void vlan_start(struct ifnet *); 197 static int vlan_transmit(struct ifnet *, struct mbuf *); 198 static void vlan_unconfig(struct ifnet *); 199 static int vlan_unconfig_locked(struct ifvlan *, struct ifvlan_linkmib *); 200 static void vlan_hash_init(void); 201 static int vlan_hash_fini(void); 202 static int vlan_tag_hash(uint16_t, u_long); 203 static struct ifvlan_linkmib* vlan_getref_linkmib(struct ifvlan *, 204 struct psref *); 205 static void vlan_putref_linkmib(struct ifvlan_linkmib *, struct psref *); 206 static void vlan_linkmib_update(struct ifvlan *, struct ifvlan_linkmib *); 207 static struct ifvlan_linkmib* vlan_lookup_tag_psref(struct ifnet *, 208 uint16_t, struct psref *); 209 210 static struct { 211 kmutex_t lock; 212 LIST_HEAD(vlan_ifvlist, ifvlan) list; 213 } ifv_list __cacheline_aligned; 214 215 216 #if !defined(VLAN_TAG_HASH_SIZE) 217 #define VLAN_TAG_HASH_SIZE 32 218 #endif 219 static struct { 220 kmutex_t lock; 221 struct pslist_head *lists; 222 u_long mask; 223 } ifv_hash __cacheline_aligned = { 224 .lists = NULL, 225 .mask = 0, 226 }; 227 228 pserialize_t vlan_psz __read_mostly; 229 static struct psref_class *ifvm_psref_class __read_mostly; 230 231 struct if_clone vlan_cloner = 232 IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy); 233 234 /* Used to pad ethernet frames with < ETHER_MIN_LEN bytes */ 235 static char vlan_zero_pad_buff[ETHER_MIN_LEN]; 236 237 static inline int 238 vlan_safe_ifpromisc(struct ifnet *ifp, int pswitch) 239 { 240 int e; 241 242 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 243 e = ifpromisc(ifp, pswitch); 244 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 245 246 return e; 247 } 248 249 static inline int 250 vlan_safe_ifpromisc_locked(struct ifnet *ifp, int pswitch) 251 { 252 int e; 253 254 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 255 e = ifpromisc_locked(ifp, pswitch); 256 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 257 258 return e; 259 } 260 261 void 262 vlanattach(int n) 263 { 264 265 /* 266 * Nothing to do here, initialization is handled by the 267 * module initialization code in vlaninit() below. 268 */ 269 } 270 271 static void 272 vlaninit(void) 273 { 274 mutex_init(&ifv_list.lock, MUTEX_DEFAULT, IPL_NONE); 275 LIST_INIT(&ifv_list.list); 276 277 mutex_init(&ifv_hash.lock, MUTEX_DEFAULT, IPL_NONE); 278 vlan_psz = pserialize_create(); 279 ifvm_psref_class = psref_class_create("vlanlinkmib", IPL_SOFTNET); 280 if_clone_attach(&vlan_cloner); 281 282 vlan_hash_init(); 283 MODULE_HOOK_SET(if_vlan_vlan_input_hook, vlan_input); 284 } 285 286 static int 287 vlandetach(void) 288 { 289 bool is_empty; 290 int error; 291 292 mutex_enter(&ifv_list.lock); 293 is_empty = LIST_EMPTY(&ifv_list.list); 294 mutex_exit(&ifv_list.lock); 295 296 if (!is_empty) 297 return EBUSY; 298 299 error = vlan_hash_fini(); 300 if (error != 0) 301 return error; 302 303 if_clone_detach(&vlan_cloner); 304 psref_class_destroy(ifvm_psref_class); 305 pserialize_destroy(vlan_psz); 306 mutex_destroy(&ifv_hash.lock); 307 mutex_destroy(&ifv_list.lock); 308 309 MODULE_HOOK_UNSET(if_vlan_vlan_input_hook); 310 return 0; 311 } 312 313 static void 314 vlan_reset_linkname(struct ifnet *ifp) 315 { 316 317 /* 318 * We start out with a "802.1Q VLAN" type and zero-length 319 * addresses. When we attach to a parent interface, we 320 * inherit its type, address length, address, and data link 321 * type. 322 */ 323 324 ifp->if_type = IFT_L2VLAN; 325 ifp->if_addrlen = 0; 326 ifp->if_dlt = DLT_NULL; 327 if_alloc_sadl(ifp); 328 } 329 330 static int 331 vlan_clone_create(struct if_clone *ifc, int unit) 332 { 333 struct ifvlan *ifv; 334 struct ifnet *ifp; 335 struct ifvlan_linkmib *mib; 336 337 ifv = malloc(sizeof(struct ifvlan), M_DEVBUF, M_WAITOK | M_ZERO); 338 mib = kmem_zalloc(sizeof(struct ifvlan_linkmib), KM_SLEEP); 339 ifp = &ifv->ifv_if; 340 LIST_INIT(&ifv->ifv_mc_listhead); 341 342 mib->ifvm_ifvlan = ifv; 343 mib->ifvm_p = NULL; 344 psref_target_init(&mib->ifvm_psref, ifvm_psref_class); 345 346 mutex_init(&ifv->ifv_lock, MUTEX_DEFAULT, IPL_NONE); 347 ifv->ifv_psz = pserialize_create(); 348 ifv->ifv_mib = mib; 349 350 mutex_enter(&ifv_list.lock); 351 LIST_INSERT_HEAD(&ifv_list.list, ifv, ifv_list); 352 mutex_exit(&ifv_list.lock); 353 354 if_initname(ifp, ifc->ifc_name, unit); 355 ifp->if_softc = ifv; 356 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 357 #ifdef NET_MPSAFE 358 ifp->if_extflags = IFEF_MPSAFE; 359 #endif 360 ifp->if_start = vlan_start; 361 ifp->if_transmit = vlan_transmit; 362 ifp->if_ioctl = vlan_ioctl; 363 IFQ_SET_READY(&ifp->if_snd); 364 if_initialize(ifp); 365 /* 366 * Set the link state to down. 367 * When the parent interface attaches we will use that link state. 368 * When the parent interface link state changes, so will ours. 369 */ 370 ifp->if_link_state = LINK_STATE_DOWN; 371 372 vlan_reset_linkname(ifp); 373 if_register(ifp); 374 return 0; 375 } 376 377 static int 378 vlan_clone_destroy(struct ifnet *ifp) 379 { 380 struct ifvlan *ifv = ifp->if_softc; 381 382 mutex_enter(&ifv_list.lock); 383 LIST_REMOVE(ifv, ifv_list); 384 mutex_exit(&ifv_list.lock); 385 386 IFNET_LOCK(ifp); 387 vlan_unconfig(ifp); 388 IFNET_UNLOCK(ifp); 389 if_detach(ifp); 390 391 psref_target_destroy(&ifv->ifv_mib->ifvm_psref, ifvm_psref_class); 392 kmem_free(ifv->ifv_mib, sizeof(struct ifvlan_linkmib)); 393 pserialize_destroy(ifv->ifv_psz); 394 mutex_destroy(&ifv->ifv_lock); 395 free(ifv, M_DEVBUF); 396 397 return 0; 398 } 399 400 /* 401 * Configure a VLAN interface. 402 */ 403 static int 404 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 405 { 406 struct ifnet *ifp = &ifv->ifv_if; 407 struct ifvlan_linkmib *nmib = NULL; 408 struct ifvlan_linkmib *omib = NULL; 409 struct ifvlan_linkmib *checkmib; 410 struct psref_target *nmib_psref = NULL; 411 const uint16_t vid = EVL_VLANOFTAG(tag); 412 int error = 0; 413 int idx; 414 bool omib_cleanup = false; 415 struct psref psref; 416 417 /* VLAN ID 0 and 4095 are reserved in the spec */ 418 if ((vid == 0) || (vid == 0xfff)) 419 return EINVAL; 420 421 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 422 mutex_enter(&ifv->ifv_lock); 423 omib = ifv->ifv_mib; 424 425 if (omib->ifvm_p != NULL) { 426 error = EBUSY; 427 goto done; 428 } 429 430 /* Duplicate check */ 431 checkmib = vlan_lookup_tag_psref(p, vid, &psref); 432 if (checkmib != NULL) { 433 vlan_putref_linkmib(checkmib, &psref); 434 error = EEXIST; 435 goto done; 436 } 437 438 *nmib = *omib; 439 nmib_psref = &nmib->ifvm_psref; 440 441 psref_target_init(nmib_psref, ifvm_psref_class); 442 443 switch (p->if_type) { 444 case IFT_ETHER: 445 { 446 struct ethercom *ec = (void *)p; 447 struct vlanid_list *vidmem; 448 449 nmib->ifvm_msw = &vlan_ether_multisw; 450 nmib->ifvm_encaplen = ETHER_VLAN_ENCAP_LEN; 451 nmib->ifvm_mintu = ETHERMIN; 452 453 if (ec->ec_nvlans++ == 0) { 454 IFNET_LOCK(p); 455 error = ether_enable_vlan_mtu(p); 456 IFNET_UNLOCK(p); 457 if (error >= 0) { 458 if (error) { 459 ec->ec_nvlans--; 460 goto done; 461 } 462 nmib->ifvm_mtufudge = 0; 463 } else { 464 /* 465 * Fudge the MTU by the encapsulation size. This 466 * makes us incompatible with strictly compliant 467 * 802.1Q implementations, but allows us to use 468 * the feature with other NetBSD 469 * implementations, which might still be useful. 470 */ 471 nmib->ifvm_mtufudge = nmib->ifvm_encaplen; 472 } 473 error = 0; 474 } 475 /* Add a vid to the list */ 476 vidmem = kmem_alloc(sizeof(struct vlanid_list), KM_SLEEP); 477 vidmem->vid = vid; 478 ETHER_LOCK(ec); 479 SIMPLEQ_INSERT_TAIL(&ec->ec_vids, vidmem, vid_list); 480 ETHER_UNLOCK(ec); 481 482 if (ec->ec_vlan_cb != NULL) { 483 /* 484 * Call ec_vlan_cb(). It will setup VLAN HW filter or 485 * HW tagging function. 486 */ 487 error = (*ec->ec_vlan_cb)(ec, vid, true); 488 if (error) { 489 ec->ec_nvlans--; 490 if (ec->ec_nvlans == 0) { 491 IFNET_LOCK(p); 492 (void)ether_disable_vlan_mtu(p); 493 IFNET_UNLOCK(p); 494 } 495 goto done; 496 } 497 } 498 /* 499 * If the parent interface can do hardware-assisted 500 * VLAN encapsulation, then propagate its hardware- 501 * assisted checksumming flags and tcp segmentation 502 * offload. 503 */ 504 if (ec->ec_capabilities & ETHERCAP_VLAN_HWTAGGING) { 505 ifp->if_capabilities = p->if_capabilities & 506 (IFCAP_TSOv4 | IFCAP_TSOv6 | 507 IFCAP_CSUM_IPv4_Tx | IFCAP_CSUM_IPv4_Rx | 508 IFCAP_CSUM_TCPv4_Tx | IFCAP_CSUM_TCPv4_Rx | 509 IFCAP_CSUM_UDPv4_Tx | IFCAP_CSUM_UDPv4_Rx | 510 IFCAP_CSUM_TCPv6_Tx | IFCAP_CSUM_TCPv6_Rx | 511 IFCAP_CSUM_UDPv6_Tx | IFCAP_CSUM_UDPv6_Rx); 512 } 513 514 /* 515 * We inherit the parent's Ethernet address. 516 */ 517 ether_ifattach(ifp, CLLADDR(p->if_sadl)); 518 ifp->if_hdrlen = sizeof(struct ether_vlan_header); /* XXX? */ 519 break; 520 } 521 522 default: 523 error = EPROTONOSUPPORT; 524 goto done; 525 } 526 527 nmib->ifvm_p = p; 528 nmib->ifvm_tag = vid; 529 ifv->ifv_if.if_mtu = p->if_mtu - nmib->ifvm_mtufudge; 530 ifv->ifv_if.if_flags = p->if_flags & 531 (IFF_UP | IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 532 533 /* 534 * Inherit the if_type from the parent. This allows us 535 * to participate in bridges of that type. 536 */ 537 ifv->ifv_if.if_type = p->if_type; 538 539 PSLIST_ENTRY_INIT(ifv, ifv_hash); 540 idx = vlan_tag_hash(vid, ifv_hash.mask); 541 542 mutex_enter(&ifv_hash.lock); 543 PSLIST_WRITER_INSERT_HEAD(&ifv_hash.lists[idx], ifv, ifv_hash); 544 mutex_exit(&ifv_hash.lock); 545 546 vlan_linkmib_update(ifv, nmib); 547 nmib = NULL; 548 nmib_psref = NULL; 549 omib_cleanup = true; 550 551 552 /* 553 * We inherit the parents link state. 554 */ 555 if_link_state_change(&ifv->ifv_if, p->if_link_state); 556 557 done: 558 mutex_exit(&ifv->ifv_lock); 559 560 if (nmib_psref) 561 psref_target_destroy(nmib_psref, ifvm_psref_class); 562 if (nmib) 563 kmem_free(nmib, sizeof(*nmib)); 564 if (omib_cleanup) 565 kmem_free(omib, sizeof(*omib)); 566 567 return error; 568 } 569 570 /* 571 * Unconfigure a VLAN interface. 572 */ 573 static void 574 vlan_unconfig(struct ifnet *ifp) 575 { 576 struct ifvlan *ifv = ifp->if_softc; 577 struct ifvlan_linkmib *nmib = NULL; 578 int error; 579 580 KASSERT(IFNET_LOCKED(ifp)); 581 582 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 583 584 mutex_enter(&ifv->ifv_lock); 585 error = vlan_unconfig_locked(ifv, nmib); 586 mutex_exit(&ifv->ifv_lock); 587 588 if (error) 589 kmem_free(nmib, sizeof(*nmib)); 590 } 591 static int 592 vlan_unconfig_locked(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 593 { 594 struct ifnet *p; 595 struct ifnet *ifp = &ifv->ifv_if; 596 struct psref_target *nmib_psref = NULL; 597 struct ifvlan_linkmib *omib; 598 int error = 0; 599 600 KASSERT(IFNET_LOCKED(ifp)); 601 KASSERT(mutex_owned(&ifv->ifv_lock)); 602 603 ifp->if_flags &= ~(IFF_UP | IFF_RUNNING); 604 605 omib = ifv->ifv_mib; 606 p = omib->ifvm_p; 607 608 if (p == NULL) { 609 error = -1; 610 goto done; 611 } 612 613 *nmib = *omib; 614 nmib_psref = &nmib->ifvm_psref; 615 psref_target_init(nmib_psref, ifvm_psref_class); 616 617 /* 618 * Since the interface is being unconfigured, we need to empty the 619 * list of multicast groups that we may have joined while we were 620 * alive and remove them from the parent's list also. 621 */ 622 (*nmib->ifvm_msw->vmsw_purgemulti)(ifv); 623 624 /* Disconnect from parent. */ 625 switch (p->if_type) { 626 case IFT_ETHER: 627 { 628 struct ethercom *ec = (void *)p; 629 struct vlanid_list *vlanidp; 630 uint16_t vid = EVL_VLANOFTAG(nmib->ifvm_tag); 631 632 ETHER_LOCK(ec); 633 SIMPLEQ_FOREACH(vlanidp, &ec->ec_vids, vid_list) { 634 if (vlanidp->vid == vid) { 635 SIMPLEQ_REMOVE(&ec->ec_vids, vlanidp, 636 vlanid_list, vid_list); 637 break; 638 } 639 } 640 ETHER_UNLOCK(ec); 641 if (vlanidp != NULL) 642 kmem_free(vlanidp, sizeof(*vlanidp)); 643 644 if (ec->ec_vlan_cb != NULL) { 645 /* 646 * Call ec_vlan_cb(). It will setup VLAN HW filter or 647 * HW tagging function. 648 */ 649 (void)(*ec->ec_vlan_cb)(ec, vid, false); 650 } 651 if (--ec->ec_nvlans == 0) { 652 IFNET_LOCK(p); 653 (void)ether_disable_vlan_mtu(p); 654 IFNET_UNLOCK(p); 655 } 656 657 /* XXX ether_ifdetach must not be called with IFNET_LOCK */ 658 mutex_exit(&ifv->ifv_lock); 659 IFNET_UNLOCK(ifp); 660 ether_ifdetach(ifp); 661 IFNET_LOCK(ifp); 662 mutex_enter(&ifv->ifv_lock); 663 664 /* if_free_sadl must be called with IFNET_LOCK */ 665 if_free_sadl(ifp, 1); 666 667 /* Restore vlan_ioctl overwritten by ether_ifdetach */ 668 ifp->if_ioctl = vlan_ioctl; 669 vlan_reset_linkname(ifp); 670 break; 671 } 672 673 default: 674 panic("%s: impossible", __func__); 675 } 676 677 nmib->ifvm_p = NULL; 678 ifv->ifv_if.if_mtu = 0; 679 ifv->ifv_flags = 0; 680 681 mutex_enter(&ifv_hash.lock); 682 PSLIST_WRITER_REMOVE(ifv, ifv_hash); 683 pserialize_perform(vlan_psz); 684 mutex_exit(&ifv_hash.lock); 685 PSLIST_ENTRY_DESTROY(ifv, ifv_hash); 686 687 vlan_linkmib_update(ifv, nmib); 688 689 mutex_exit(&ifv->ifv_lock); 690 691 nmib_psref = NULL; 692 kmem_free(omib, sizeof(*omib)); 693 694 #ifdef INET6 695 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 696 /* To delete v6 link local addresses */ 697 if (in6_present) 698 in6_ifdetach(ifp); 699 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 700 #endif 701 702 if ((ifp->if_flags & IFF_PROMISC) != 0) 703 vlan_safe_ifpromisc_locked(ifp, 0); 704 if_down_locked(ifp); 705 ifp->if_capabilities = 0; 706 mutex_enter(&ifv->ifv_lock); 707 done: 708 709 if (nmib_psref) 710 psref_target_destroy(nmib_psref, ifvm_psref_class); 711 712 return error; 713 } 714 715 static void 716 vlan_hash_init(void) 717 { 718 719 ifv_hash.lists = hashinit(VLAN_TAG_HASH_SIZE, HASH_PSLIST, true, 720 &ifv_hash.mask); 721 } 722 723 static int 724 vlan_hash_fini(void) 725 { 726 int i; 727 728 mutex_enter(&ifv_hash.lock); 729 730 for (i = 0; i < ifv_hash.mask + 1; i++) { 731 if (PSLIST_WRITER_FIRST(&ifv_hash.lists[i], struct ifvlan, 732 ifv_hash) != NULL) { 733 mutex_exit(&ifv_hash.lock); 734 return EBUSY; 735 } 736 } 737 738 for (i = 0; i < ifv_hash.mask + 1; i++) 739 PSLIST_DESTROY(&ifv_hash.lists[i]); 740 741 mutex_exit(&ifv_hash.lock); 742 743 hashdone(ifv_hash.lists, HASH_PSLIST, ifv_hash.mask); 744 745 ifv_hash.lists = NULL; 746 ifv_hash.mask = 0; 747 748 return 0; 749 } 750 751 static int 752 vlan_tag_hash(uint16_t tag, u_long mask) 753 { 754 uint32_t hash; 755 756 hash = (tag >> 8) ^ tag; 757 hash = (hash >> 2) ^ hash; 758 759 return hash & mask; 760 } 761 762 static struct ifvlan_linkmib * 763 vlan_getref_linkmib(struct ifvlan *sc, struct psref *psref) 764 { 765 struct ifvlan_linkmib *mib; 766 int s; 767 768 s = pserialize_read_enter(); 769 mib = atomic_load_consume(&sc->ifv_mib); 770 if (mib == NULL) { 771 pserialize_read_exit(s); 772 return NULL; 773 } 774 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 775 pserialize_read_exit(s); 776 777 return mib; 778 } 779 780 static void 781 vlan_putref_linkmib(struct ifvlan_linkmib *mib, struct psref *psref) 782 { 783 if (mib == NULL) 784 return; 785 psref_release(psref, &mib->ifvm_psref, ifvm_psref_class); 786 } 787 788 static struct ifvlan_linkmib * 789 vlan_lookup_tag_psref(struct ifnet *ifp, uint16_t tag, struct psref *psref) 790 { 791 int idx; 792 int s; 793 struct ifvlan *sc; 794 795 idx = vlan_tag_hash(tag, ifv_hash.mask); 796 797 s = pserialize_read_enter(); 798 PSLIST_READER_FOREACH(sc, &ifv_hash.lists[idx], struct ifvlan, 799 ifv_hash) { 800 struct ifvlan_linkmib *mib = atomic_load_consume(&sc->ifv_mib); 801 if (mib == NULL) 802 continue; 803 if (mib->ifvm_tag != tag) 804 continue; 805 if (mib->ifvm_p != ifp) 806 continue; 807 808 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 809 pserialize_read_exit(s); 810 return mib; 811 } 812 pserialize_read_exit(s); 813 return NULL; 814 } 815 816 static void 817 vlan_linkmib_update(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 818 { 819 struct ifvlan_linkmib *omib = ifv->ifv_mib; 820 821 KASSERT(mutex_owned(&ifv->ifv_lock)); 822 823 atomic_store_release(&ifv->ifv_mib, nmib); 824 825 pserialize_perform(ifv->ifv_psz); 826 psref_target_destroy(&omib->ifvm_psref, ifvm_psref_class); 827 } 828 829 /* 830 * Called when a parent interface is detaching; destroy any VLAN 831 * configuration for the parent interface. 832 */ 833 void 834 vlan_ifdetach(struct ifnet *p) 835 { 836 struct ifvlan *ifv; 837 struct ifvlan_linkmib *mib, **nmibs; 838 struct psref psref; 839 int error; 840 int bound; 841 int i, cnt = 0; 842 843 bound = curlwp_bind(); 844 845 mutex_enter(&ifv_list.lock); 846 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 847 mib = vlan_getref_linkmib(ifv, &psref); 848 if (mib == NULL) 849 continue; 850 851 if (mib->ifvm_p == p) 852 cnt++; 853 854 vlan_putref_linkmib(mib, &psref); 855 } 856 mutex_exit(&ifv_list.lock); 857 858 if (cnt == 0) { 859 curlwp_bindx(bound); 860 return; 861 } 862 863 /* 864 * The value of "cnt" does not increase while ifv_list.lock 865 * and ifv->ifv_lock are released here, because the parent 866 * interface is detaching. 867 */ 868 nmibs = kmem_alloc(sizeof(*nmibs) * cnt, KM_SLEEP); 869 for (i = 0; i < cnt; i++) { 870 nmibs[i] = kmem_alloc(sizeof(*nmibs[i]), KM_SLEEP); 871 } 872 873 mutex_enter(&ifv_list.lock); 874 875 i = 0; 876 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 877 struct ifnet *ifp = &ifv->ifv_if; 878 879 /* IFNET_LOCK must be held before ifv_lock. */ 880 IFNET_LOCK(ifp); 881 mutex_enter(&ifv->ifv_lock); 882 883 /* XXX ifv_mib = NULL? */ 884 if (ifv->ifv_mib->ifvm_p == p) { 885 KASSERTMSG(i < cnt, 886 "no memory for unconfig, parent=%s", p->if_xname); 887 error = vlan_unconfig_locked(ifv, nmibs[i]); 888 if (!error) { 889 nmibs[i] = NULL; 890 i++; 891 } 892 893 } 894 895 mutex_exit(&ifv->ifv_lock); 896 IFNET_UNLOCK(ifp); 897 } 898 899 mutex_exit(&ifv_list.lock); 900 901 curlwp_bindx(bound); 902 903 for (i = 0; i < cnt; i++) { 904 if (nmibs[i]) 905 kmem_free(nmibs[i], sizeof(*nmibs[i])); 906 } 907 908 kmem_free(nmibs, sizeof(*nmibs) * cnt); 909 910 return; 911 } 912 913 static int 914 vlan_set_promisc(struct ifnet *ifp) 915 { 916 struct ifvlan *ifv = ifp->if_softc; 917 struct ifvlan_linkmib *mib; 918 struct psref psref; 919 int error = 0; 920 int bound; 921 922 bound = curlwp_bind(); 923 mib = vlan_getref_linkmib(ifv, &psref); 924 if (mib == NULL) { 925 curlwp_bindx(bound); 926 return EBUSY; 927 } 928 929 if ((ifp->if_flags & IFF_PROMISC) != 0) { 930 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) { 931 error = vlan_safe_ifpromisc(mib->ifvm_p, 1); 932 if (error == 0) 933 ifv->ifv_flags |= IFVF_PROMISC; 934 } 935 } else { 936 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) { 937 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 938 if (error == 0) 939 ifv->ifv_flags &= ~IFVF_PROMISC; 940 } 941 } 942 vlan_putref_linkmib(mib, &psref); 943 curlwp_bindx(bound); 944 945 return error; 946 } 947 948 static int 949 vlan_ioctl(struct ifnet *ifp, u_long cmd, void *data) 950 { 951 struct lwp *l = curlwp; 952 struct ifvlan *ifv = ifp->if_softc; 953 struct ifaddr *ifa = (struct ifaddr *) data; 954 struct ifreq *ifr = (struct ifreq *) data; 955 struct ifnet *pr; 956 struct ifcapreq *ifcr; 957 struct vlanreq vlr; 958 struct ifvlan_linkmib *mib; 959 struct psref psref; 960 int error = 0; 961 int bound; 962 963 switch (cmd) { 964 case SIOCSIFMTU: 965 bound = curlwp_bind(); 966 mib = vlan_getref_linkmib(ifv, &psref); 967 if (mib == NULL) { 968 curlwp_bindx(bound); 969 error = EBUSY; 970 break; 971 } 972 973 if (mib->ifvm_p == NULL) { 974 vlan_putref_linkmib(mib, &psref); 975 curlwp_bindx(bound); 976 error = EINVAL; 977 } else if ( 978 ifr->ifr_mtu > (mib->ifvm_p->if_mtu - mib->ifvm_mtufudge) || 979 ifr->ifr_mtu < (mib->ifvm_mintu - mib->ifvm_mtufudge)) { 980 vlan_putref_linkmib(mib, &psref); 981 curlwp_bindx(bound); 982 error = EINVAL; 983 } else { 984 vlan_putref_linkmib(mib, &psref); 985 curlwp_bindx(bound); 986 987 error = ifioctl_common(ifp, cmd, data); 988 if (error == ENETRESET) 989 error = 0; 990 } 991 992 break; 993 994 case SIOCSETVLAN: 995 if ((error = kauth_authorize_network(l->l_cred, 996 KAUTH_NETWORK_INTERFACE, 997 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 998 NULL)) != 0) 999 break; 1000 if ((error = copyin(ifr->ifr_data, &vlr, sizeof(vlr))) != 0) 1001 break; 1002 1003 if (vlr.vlr_parent[0] == '\0') { 1004 bound = curlwp_bind(); 1005 mib = vlan_getref_linkmib(ifv, &psref); 1006 if (mib == NULL) { 1007 curlwp_bindx(bound); 1008 error = EBUSY; 1009 break; 1010 } 1011 1012 if (mib->ifvm_p != NULL && 1013 (ifp->if_flags & IFF_PROMISC) != 0) 1014 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 1015 1016 vlan_putref_linkmib(mib, &psref); 1017 curlwp_bindx(bound); 1018 1019 vlan_unconfig(ifp); 1020 break; 1021 } 1022 if (vlr.vlr_tag != EVL_VLANOFTAG(vlr.vlr_tag)) { 1023 error = EINVAL; /* check for valid tag */ 1024 break; 1025 } 1026 if ((pr = ifunit(vlr.vlr_parent)) == NULL) { 1027 error = ENOENT; 1028 break; 1029 } 1030 1031 error = vlan_config(ifv, pr, vlr.vlr_tag); 1032 if (error != 0) 1033 break; 1034 1035 /* Update promiscuous mode, if necessary. */ 1036 vlan_set_promisc(ifp); 1037 1038 ifp->if_flags |= IFF_RUNNING; 1039 break; 1040 1041 case SIOCGETVLAN: 1042 memset(&vlr, 0, sizeof(vlr)); 1043 bound = curlwp_bind(); 1044 mib = vlan_getref_linkmib(ifv, &psref); 1045 if (mib == NULL) { 1046 curlwp_bindx(bound); 1047 error = EBUSY; 1048 break; 1049 } 1050 if (mib->ifvm_p != NULL) { 1051 snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent), "%s", 1052 mib->ifvm_p->if_xname); 1053 vlr.vlr_tag = mib->ifvm_tag; 1054 } 1055 vlan_putref_linkmib(mib, &psref); 1056 curlwp_bindx(bound); 1057 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1058 break; 1059 1060 case SIOCSIFFLAGS: 1061 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1062 break; 1063 /* 1064 * For promiscuous mode, we enable promiscuous mode on 1065 * the parent if we need promiscuous on the VLAN interface. 1066 */ 1067 bound = curlwp_bind(); 1068 mib = vlan_getref_linkmib(ifv, &psref); 1069 if (mib == NULL) { 1070 curlwp_bindx(bound); 1071 error = EBUSY; 1072 break; 1073 } 1074 1075 if (mib->ifvm_p != NULL) 1076 error = vlan_set_promisc(ifp); 1077 vlan_putref_linkmib(mib, &psref); 1078 curlwp_bindx(bound); 1079 break; 1080 1081 case SIOCADDMULTI: 1082 mutex_enter(&ifv->ifv_lock); 1083 mib = ifv->ifv_mib; 1084 if (mib == NULL) { 1085 error = EBUSY; 1086 mutex_exit(&ifv->ifv_lock); 1087 break; 1088 } 1089 1090 error = (mib->ifvm_p != NULL) ? 1091 (*mib->ifvm_msw->vmsw_addmulti)(ifv, ifr) : EINVAL; 1092 mib = NULL; 1093 mutex_exit(&ifv->ifv_lock); 1094 break; 1095 1096 case SIOCDELMULTI: 1097 mutex_enter(&ifv->ifv_lock); 1098 mib = ifv->ifv_mib; 1099 if (mib == NULL) { 1100 error = EBUSY; 1101 mutex_exit(&ifv->ifv_lock); 1102 break; 1103 } 1104 error = (mib->ifvm_p != NULL) ? 1105 (*mib->ifvm_msw->vmsw_delmulti)(ifv, ifr) : EINVAL; 1106 mib = NULL; 1107 mutex_exit(&ifv->ifv_lock); 1108 break; 1109 1110 case SIOCSIFCAP: 1111 ifcr = data; 1112 /* make sure caps are enabled on parent */ 1113 bound = curlwp_bind(); 1114 mib = vlan_getref_linkmib(ifv, &psref); 1115 if (mib == NULL) { 1116 curlwp_bindx(bound); 1117 error = EBUSY; 1118 break; 1119 } 1120 1121 if (mib->ifvm_p == NULL) { 1122 vlan_putref_linkmib(mib, &psref); 1123 curlwp_bindx(bound); 1124 error = EINVAL; 1125 break; 1126 } 1127 if ((mib->ifvm_p->if_capenable & ifcr->ifcr_capenable) != 1128 ifcr->ifcr_capenable) { 1129 vlan_putref_linkmib(mib, &psref); 1130 curlwp_bindx(bound); 1131 error = EINVAL; 1132 break; 1133 } 1134 1135 vlan_putref_linkmib(mib, &psref); 1136 curlwp_bindx(bound); 1137 1138 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1139 error = 0; 1140 break; 1141 case SIOCINITIFADDR: 1142 bound = curlwp_bind(); 1143 mib = vlan_getref_linkmib(ifv, &psref); 1144 if (mib == NULL) { 1145 curlwp_bindx(bound); 1146 error = EBUSY; 1147 break; 1148 } 1149 1150 if (mib->ifvm_p == NULL) { 1151 error = EINVAL; 1152 vlan_putref_linkmib(mib, &psref); 1153 curlwp_bindx(bound); 1154 break; 1155 } 1156 vlan_putref_linkmib(mib, &psref); 1157 curlwp_bindx(bound); 1158 1159 ifp->if_flags |= IFF_UP; 1160 #ifdef INET 1161 if (ifa->ifa_addr->sa_family == AF_INET) 1162 arp_ifinit(ifp, ifa); 1163 #endif 1164 break; 1165 1166 default: 1167 error = ether_ioctl(ifp, cmd, data); 1168 } 1169 1170 return error; 1171 } 1172 1173 static int 1174 vlan_ether_addmulti(struct ifvlan *ifv, struct ifreq *ifr) 1175 { 1176 const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr); 1177 struct vlan_mc_entry *mc; 1178 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1179 struct ifvlan_linkmib *mib; 1180 int error; 1181 1182 KASSERT(mutex_owned(&ifv->ifv_lock)); 1183 1184 if (sa->sa_len > sizeof(struct sockaddr_storage)) 1185 return EINVAL; 1186 1187 error = ether_addmulti(sa, &ifv->ifv_ec); 1188 if (error != ENETRESET) 1189 return error; 1190 1191 /* 1192 * This is a new multicast address. We have to tell parent 1193 * about it. Also, remember this multicast address so that 1194 * we can delete it on unconfigure. 1195 */ 1196 mc = malloc(sizeof(struct vlan_mc_entry), M_DEVBUF, M_NOWAIT); 1197 if (mc == NULL) { 1198 error = ENOMEM; 1199 goto alloc_failed; 1200 } 1201 1202 /* 1203 * Since ether_addmulti() returned ENETRESET, the following two 1204 * statements shouldn't fail. Here ifv_ec is implicitly protected 1205 * by the ifv_lock lock. 1206 */ 1207 error = ether_multiaddr(sa, addrlo, addrhi); 1208 KASSERT(error == 0); 1209 1210 ETHER_LOCK(&ifv->ifv_ec); 1211 mc->mc_enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1212 ETHER_UNLOCK(&ifv->ifv_ec); 1213 1214 KASSERT(mc->mc_enm != NULL); 1215 1216 memcpy(&mc->mc_addr, sa, sa->sa_len); 1217 LIST_INSERT_HEAD(&ifv->ifv_mc_listhead, mc, mc_entries); 1218 1219 mib = ifv->ifv_mib; 1220 1221 KERNEL_LOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1222 error = if_mcast_op(mib->ifvm_p, SIOCADDMULTI, sa); 1223 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1224 1225 if (error != 0) 1226 goto ioctl_failed; 1227 return error; 1228 1229 ioctl_failed: 1230 LIST_REMOVE(mc, mc_entries); 1231 free(mc, M_DEVBUF); 1232 1233 alloc_failed: 1234 (void)ether_delmulti(sa, &ifv->ifv_ec); 1235 return error; 1236 } 1237 1238 static int 1239 vlan_ether_delmulti(struct ifvlan *ifv, struct ifreq *ifr) 1240 { 1241 const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr); 1242 struct ether_multi *enm; 1243 struct vlan_mc_entry *mc; 1244 struct ifvlan_linkmib *mib; 1245 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1246 int error; 1247 1248 KASSERT(mutex_owned(&ifv->ifv_lock)); 1249 1250 /* 1251 * Find a key to lookup vlan_mc_entry. We have to do this 1252 * before calling ether_delmulti for obvious reasons. 1253 */ 1254 if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0) 1255 return error; 1256 1257 ETHER_LOCK(&ifv->ifv_ec); 1258 enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1259 ETHER_UNLOCK(&ifv->ifv_ec); 1260 if (enm == NULL) 1261 return EINVAL; 1262 1263 LIST_FOREACH(mc, &ifv->ifv_mc_listhead, mc_entries) { 1264 if (mc->mc_enm == enm) 1265 break; 1266 } 1267 1268 /* We woun't delete entries we didn't add */ 1269 if (mc == NULL) 1270 return EINVAL; 1271 1272 error = ether_delmulti(sa, &ifv->ifv_ec); 1273 if (error != ENETRESET) 1274 return error; 1275 1276 /* We no longer use this multicast address. Tell parent so. */ 1277 mib = ifv->ifv_mib; 1278 error = if_mcast_op(mib->ifvm_p, SIOCDELMULTI, sa); 1279 1280 if (error == 0) { 1281 /* And forget about this address. */ 1282 LIST_REMOVE(mc, mc_entries); 1283 free(mc, M_DEVBUF); 1284 } else { 1285 (void)ether_addmulti(sa, &ifv->ifv_ec); 1286 } 1287 1288 return error; 1289 } 1290 1291 /* 1292 * Delete any multicast address we have asked to add from parent 1293 * interface. Called when the vlan is being unconfigured. 1294 */ 1295 static void 1296 vlan_ether_purgemulti(struct ifvlan *ifv) 1297 { 1298 struct vlan_mc_entry *mc; 1299 struct ifvlan_linkmib *mib; 1300 1301 KASSERT(mutex_owned(&ifv->ifv_lock)); 1302 mib = ifv->ifv_mib; 1303 if (mib == NULL) { 1304 return; 1305 } 1306 1307 while ((mc = LIST_FIRST(&ifv->ifv_mc_listhead)) != NULL) { 1308 (void)if_mcast_op(mib->ifvm_p, SIOCDELMULTI, 1309 sstocsa(&mc->mc_addr)); 1310 LIST_REMOVE(mc, mc_entries); 1311 free(mc, M_DEVBUF); 1312 } 1313 } 1314 1315 static void 1316 vlan_start(struct ifnet *ifp) 1317 { 1318 struct ifvlan *ifv = ifp->if_softc; 1319 struct ifnet *p; 1320 struct ethercom *ec; 1321 struct mbuf *m; 1322 struct ifvlan_linkmib *mib; 1323 struct psref psref; 1324 int error; 1325 1326 mib = vlan_getref_linkmib(ifv, &psref); 1327 if (mib == NULL) 1328 return; 1329 p = mib->ifvm_p; 1330 ec = (void *)mib->ifvm_p; 1331 1332 ifp->if_flags |= IFF_OACTIVE; 1333 1334 for (;;) { 1335 IFQ_DEQUEUE(&ifp->if_snd, m); 1336 if (m == NULL) 1337 break; 1338 1339 #ifdef ALTQ 1340 /* 1341 * KERNEL_LOCK is required for ALTQ even if NET_MPSAFE is 1342 * defined. 1343 */ 1344 KERNEL_LOCK(1, NULL); 1345 /* 1346 * If ALTQ is enabled on the parent interface, do 1347 * classification; the queueing discipline might 1348 * not require classification, but might require 1349 * the address family/header pointer in the pktattr. 1350 */ 1351 if (ALTQ_IS_ENABLED(&p->if_snd)) { 1352 switch (p->if_type) { 1353 case IFT_ETHER: 1354 altq_etherclassify(&p->if_snd, m); 1355 break; 1356 default: 1357 panic("%s: impossible (altq)", __func__); 1358 } 1359 } 1360 KERNEL_UNLOCK_ONE(NULL); 1361 #endif /* ALTQ */ 1362 1363 bpf_mtap(ifp, m, BPF_D_OUT); 1364 /* 1365 * If the parent can insert the tag itself, just mark 1366 * the tag in the mbuf header. 1367 */ 1368 if (ec->ec_capenable & ETHERCAP_VLAN_HWTAGGING) { 1369 vlan_set_tag(m, mib->ifvm_tag); 1370 } else { 1371 /* 1372 * insert the tag ourselves 1373 */ 1374 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1375 if (m == NULL) { 1376 printf("%s: unable to prepend encap header", 1377 p->if_xname); 1378 if_statinc(ifp, if_oerrors); 1379 continue; 1380 } 1381 1382 switch (p->if_type) { 1383 case IFT_ETHER: 1384 { 1385 struct ether_vlan_header *evl; 1386 1387 if (m->m_len < sizeof(struct ether_vlan_header)) 1388 m = m_pullup(m, 1389 sizeof(struct ether_vlan_header)); 1390 if (m == NULL) { 1391 printf("%s: unable to pullup encap " 1392 "header", p->if_xname); 1393 if_statinc(ifp, if_oerrors); 1394 continue; 1395 } 1396 1397 /* 1398 * Transform the Ethernet header into an 1399 * Ethernet header with 802.1Q encapsulation. 1400 */ 1401 memmove(mtod(m, void *), 1402 mtod(m, char *) + mib->ifvm_encaplen, 1403 sizeof(struct ether_header)); 1404 evl = mtod(m, struct ether_vlan_header *); 1405 evl->evl_proto = evl->evl_encap_proto; 1406 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1407 evl->evl_tag = htons(mib->ifvm_tag); 1408 1409 /* 1410 * To cater for VLAN-aware layer 2 ethernet 1411 * switches which may need to strip the tag 1412 * before forwarding the packet, make sure 1413 * the packet+tag is at least 68 bytes long. 1414 * This is necessary because our parent will 1415 * only pad to 64 bytes (ETHER_MIN_LEN) and 1416 * some switches will not pad by themselves 1417 * after deleting a tag. 1418 */ 1419 const size_t min_data_len = ETHER_MIN_LEN - 1420 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1421 if (m->m_pkthdr.len < min_data_len) { 1422 m_copyback(m, m->m_pkthdr.len, 1423 min_data_len - m->m_pkthdr.len, 1424 vlan_zero_pad_buff); 1425 } 1426 break; 1427 } 1428 1429 default: 1430 panic("%s: impossible", __func__); 1431 } 1432 } 1433 1434 if ((p->if_flags & IFF_RUNNING) == 0) { 1435 m_freem(m); 1436 continue; 1437 } 1438 1439 error = if_transmit_lock(p, m); 1440 if (error) { 1441 /* mbuf is already freed */ 1442 if_statinc(ifp, if_oerrors); 1443 continue; 1444 } 1445 if_statinc(ifp, if_opackets); 1446 } 1447 1448 ifp->if_flags &= ~IFF_OACTIVE; 1449 1450 /* Remove reference to mib before release */ 1451 vlan_putref_linkmib(mib, &psref); 1452 } 1453 1454 static int 1455 vlan_transmit(struct ifnet *ifp, struct mbuf *m) 1456 { 1457 struct ifvlan *ifv = ifp->if_softc; 1458 struct ifnet *p; 1459 struct ethercom *ec; 1460 struct ifvlan_linkmib *mib; 1461 struct psref psref; 1462 int error; 1463 size_t pktlen = m->m_pkthdr.len; 1464 bool mcast = (m->m_flags & M_MCAST) != 0; 1465 1466 mib = vlan_getref_linkmib(ifv, &psref); 1467 if (mib == NULL) { 1468 m_freem(m); 1469 return ENETDOWN; 1470 } 1471 1472 p = mib->ifvm_p; 1473 ec = (void *)mib->ifvm_p; 1474 1475 bpf_mtap(ifp, m, BPF_D_OUT); 1476 1477 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 1478 goto out; 1479 if (m == NULL) 1480 goto out; 1481 1482 /* 1483 * If the parent can insert the tag itself, just mark 1484 * the tag in the mbuf header. 1485 */ 1486 if (ec->ec_capenable & ETHERCAP_VLAN_HWTAGGING) { 1487 vlan_set_tag(m, mib->ifvm_tag); 1488 } else { 1489 /* 1490 * insert the tag ourselves 1491 */ 1492 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1493 if (m == NULL) { 1494 printf("%s: unable to prepend encap header", 1495 p->if_xname); 1496 if_statinc(ifp, if_oerrors); 1497 error = ENOBUFS; 1498 goto out; 1499 } 1500 1501 switch (p->if_type) { 1502 case IFT_ETHER: 1503 { 1504 struct ether_vlan_header *evl; 1505 1506 if (m->m_len < sizeof(struct ether_vlan_header)) 1507 m = m_pullup(m, 1508 sizeof(struct ether_vlan_header)); 1509 if (m == NULL) { 1510 printf("%s: unable to pullup encap " 1511 "header", p->if_xname); 1512 if_statinc(ifp, if_oerrors); 1513 error = ENOBUFS; 1514 goto out; 1515 } 1516 1517 /* 1518 * Transform the Ethernet header into an 1519 * Ethernet header with 802.1Q encapsulation. 1520 */ 1521 memmove(mtod(m, void *), 1522 mtod(m, char *) + mib->ifvm_encaplen, 1523 sizeof(struct ether_header)); 1524 evl = mtod(m, struct ether_vlan_header *); 1525 evl->evl_proto = evl->evl_encap_proto; 1526 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1527 evl->evl_tag = htons(mib->ifvm_tag); 1528 1529 /* 1530 * To cater for VLAN-aware layer 2 ethernet 1531 * switches which may need to strip the tag 1532 * before forwarding the packet, make sure 1533 * the packet+tag is at least 68 bytes long. 1534 * This is necessary because our parent will 1535 * only pad to 64 bytes (ETHER_MIN_LEN) and 1536 * some switches will not pad by themselves 1537 * after deleting a tag. 1538 */ 1539 const size_t min_data_len = ETHER_MIN_LEN - 1540 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1541 if (m->m_pkthdr.len < min_data_len) { 1542 m_copyback(m, m->m_pkthdr.len, 1543 min_data_len - m->m_pkthdr.len, 1544 vlan_zero_pad_buff); 1545 } 1546 break; 1547 } 1548 1549 default: 1550 panic("%s: impossible", __func__); 1551 } 1552 } 1553 1554 if ((p->if_flags & IFF_RUNNING) == 0) { 1555 m_freem(m); 1556 error = ENETDOWN; 1557 goto out; 1558 } 1559 1560 error = if_transmit_lock(p, m); 1561 net_stat_ref_t nsr = IF_STAT_GETREF(ifp); 1562 if (error) { 1563 /* mbuf is already freed */ 1564 if_statinc_ref(nsr, if_oerrors); 1565 } else { 1566 if_statinc_ref(nsr, if_opackets); 1567 if_statadd_ref(nsr, if_obytes, pktlen); 1568 if (mcast) 1569 if_statinc_ref(nsr, if_omcasts); 1570 } 1571 IF_STAT_PUTREF(ifp); 1572 1573 out: 1574 /* Remove reference to mib before release */ 1575 vlan_putref_linkmib(mib, &psref); 1576 return error; 1577 } 1578 1579 /* 1580 * Given an Ethernet frame, find a valid vlan interface corresponding to the 1581 * given source interface and tag, then run the real packet through the 1582 * parent's input routine. 1583 */ 1584 void 1585 vlan_input(struct ifnet *ifp, struct mbuf *m) 1586 { 1587 struct ifvlan *ifv; 1588 uint16_t vid; 1589 struct ifvlan_linkmib *mib; 1590 struct psref psref; 1591 bool have_vtag; 1592 1593 have_vtag = vlan_has_tag(m); 1594 if (have_vtag) { 1595 vid = EVL_VLANOFTAG(vlan_get_tag(m)); 1596 m->m_flags &= ~M_VLANTAG; 1597 } else { 1598 struct ether_vlan_header *evl; 1599 1600 if (ifp->if_type != IFT_ETHER) { 1601 panic("%s: impossible", __func__); 1602 } 1603 1604 if (m->m_len < sizeof(struct ether_vlan_header) && 1605 (m = m_pullup(m, 1606 sizeof(struct ether_vlan_header))) == NULL) { 1607 printf("%s: no memory for VLAN header, " 1608 "dropping packet.\n", ifp->if_xname); 1609 return; 1610 } 1611 evl = mtod(m, struct ether_vlan_header *); 1612 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN); 1613 1614 vid = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1615 1616 /* 1617 * Restore the original ethertype. We'll remove 1618 * the encapsulation after we've found the vlan 1619 * interface corresponding to the tag. 1620 */ 1621 evl->evl_encap_proto = evl->evl_proto; 1622 } 1623 1624 mib = vlan_lookup_tag_psref(ifp, vid, &psref); 1625 if (mib == NULL) { 1626 m_freem(m); 1627 if_statinc(ifp, if_noproto); 1628 return; 1629 } 1630 KASSERT(mib->ifvm_encaplen == ETHER_VLAN_ENCAP_LEN); 1631 1632 ifv = mib->ifvm_ifvlan; 1633 if ((ifv->ifv_if.if_flags & (IFF_UP | IFF_RUNNING)) != 1634 (IFF_UP | IFF_RUNNING)) { 1635 m_freem(m); 1636 if_statinc(ifp, if_noproto); 1637 goto out; 1638 } 1639 1640 /* 1641 * Now, remove the encapsulation header. The original 1642 * header has already been fixed up above. 1643 */ 1644 if (!have_vtag) { 1645 memmove(mtod(m, char *) + mib->ifvm_encaplen, 1646 mtod(m, void *), sizeof(struct ether_header)); 1647 m_adj(m, mib->ifvm_encaplen); 1648 } 1649 1650 m_set_rcvif(m, &ifv->ifv_if); 1651 1652 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 1653 goto out; 1654 if (m == NULL) 1655 goto out; 1656 1657 m->m_flags &= ~M_PROMISC; 1658 if_input(&ifv->ifv_if, m); 1659 out: 1660 vlan_putref_linkmib(mib, &psref); 1661 } 1662 1663 /* 1664 * If the parent link state changed, the vlan link state should change also. 1665 */ 1666 void 1667 vlan_link_state_changed(struct ifnet *p, int link_state) 1668 { 1669 struct ifvlan *ifv; 1670 struct ifvlan_linkmib *mib; 1671 struct psref psref; 1672 struct ifnet *ifp; 1673 1674 mutex_enter(&ifv_list.lock); 1675 1676 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 1677 mib = vlan_getref_linkmib(ifv, &psref); 1678 if (mib == NULL) 1679 continue; 1680 1681 if (mib->ifvm_p == p) { 1682 ifp = &mib->ifvm_ifvlan->ifv_if; 1683 if_link_state_change(ifp, link_state); 1684 } 1685 1686 vlan_putref_linkmib(mib, &psref); 1687 } 1688 1689 mutex_exit(&ifv_list.lock); 1690 } 1691 1692 /* 1693 * Module infrastructure 1694 */ 1695 #include "if_module.h" 1696 1697 IF_MODULE(MODULE_CLASS_DRIVER, vlan, NULL) 1698
Indexes created Sun Oct 12 09:09:55 GMT 2025