if_vlan.c revision 1.124.2.2
1 /* $NetBSD: if_vlan.c,v 1.124.2.2 2018/06/25 07:26:06 pgoyette 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 1.124.2.2 2018/06/25 07:26:06 pgoyette 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 #endif 123 124 #include "ioconf.h" 125 126 struct vlan_mc_entry { 127 LIST_ENTRY(vlan_mc_entry) mc_entries; 128 /* 129 * A key to identify this entry. The mc_addr below can't be 130 * used since multiple sockaddr may mapped into the same 131 * ether_multi (e.g., AF_UNSPEC). 132 */ 133 union { 134 struct ether_multi *mcu_enm; 135 } mc_u; 136 struct sockaddr_storage mc_addr; 137 }; 138 139 #define mc_enm mc_u.mcu_enm 140 141 142 struct ifvlan_linkmib { 143 struct ifvlan *ifvm_ifvlan; 144 const struct vlan_multisw *ifvm_msw; 145 int ifvm_encaplen; /* encapsulation length */ 146 int ifvm_mtufudge; /* MTU fudged by this much */ 147 int ifvm_mintu; /* min transmission unit */ 148 uint16_t ifvm_proto; /* encapsulation ethertype */ 149 uint16_t ifvm_tag; /* tag to apply on packets */ 150 struct ifnet *ifvm_p; /* parent interface of this vlan */ 151 152 struct psref_target ifvm_psref; 153 }; 154 155 struct ifvlan { 156 union { 157 struct ethercom ifvu_ec; 158 } ifv_u; 159 struct ifvlan_linkmib *ifv_mib; /* 160 * reader must use vlan_getref_linkmib() 161 * instead of direct dereference 162 */ 163 kmutex_t ifv_lock; /* writer lock for ifv_mib */ 164 165 LIST_HEAD(__vlan_mchead, vlan_mc_entry) ifv_mc_listhead; 166 LIST_ENTRY(ifvlan) ifv_list; 167 struct pslist_entry ifv_hash; 168 int ifv_flags; 169 }; 170 171 #define IFVF_PROMISC 0x01 /* promiscuous mode enabled */ 172 173 #define ifv_ec ifv_u.ifvu_ec 174 175 #define ifv_if ifv_ec.ec_if 176 177 #define ifv_msw ifv_mib.ifvm_msw 178 #define ifv_encaplen ifv_mib.ifvm_encaplen 179 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 180 #define ifv_mintu ifv_mib.ifvm_mintu 181 #define ifv_tag ifv_mib.ifvm_tag 182 183 struct vlan_multisw { 184 int (*vmsw_addmulti)(struct ifvlan *, struct ifreq *); 185 int (*vmsw_delmulti)(struct ifvlan *, struct ifreq *); 186 void (*vmsw_purgemulti)(struct ifvlan *); 187 }; 188 189 static int vlan_ether_addmulti(struct ifvlan *, struct ifreq *); 190 static int vlan_ether_delmulti(struct ifvlan *, struct ifreq *); 191 static void vlan_ether_purgemulti(struct ifvlan *); 192 193 const struct vlan_multisw vlan_ether_multisw = { 194 .vmsw_addmulti = vlan_ether_addmulti, 195 .vmsw_delmulti = vlan_ether_delmulti, 196 .vmsw_purgemulti = vlan_ether_purgemulti, 197 }; 198 199 static int vlan_clone_create(struct if_clone *, int); 200 static int vlan_clone_destroy(struct ifnet *); 201 static int vlan_config(struct ifvlan *, struct ifnet *, 202 uint16_t); 203 static int vlan_ioctl(struct ifnet *, u_long, void *); 204 static void vlan_start(struct ifnet *); 205 static int vlan_transmit(struct ifnet *, struct mbuf *); 206 static void vlan_unconfig(struct ifnet *); 207 static int vlan_unconfig_locked(struct ifvlan *, 208 struct ifvlan_linkmib *); 209 static void vlan_hash_init(void); 210 static int vlan_hash_fini(void); 211 static int vlan_tag_hash(uint16_t, u_long); 212 static struct ifvlan_linkmib* vlan_getref_linkmib(struct ifvlan *, 213 struct psref *); 214 static void vlan_putref_linkmib(struct ifvlan_linkmib *, 215 struct psref *); 216 static void vlan_linkmib_update(struct ifvlan *, 217 struct ifvlan_linkmib *); 218 static struct ifvlan_linkmib* vlan_lookup_tag_psref(struct ifnet *, 219 uint16_t, struct psref *); 220 221 LIST_HEAD(vlan_ifvlist, ifvlan); 222 static struct { 223 kmutex_t lock; 224 struct vlan_ifvlist list; 225 } ifv_list __cacheline_aligned; 226 227 228 #if !defined(VLAN_TAG_HASH_SIZE) 229 #define VLAN_TAG_HASH_SIZE 32 230 #endif 231 static struct { 232 kmutex_t lock; 233 struct pslist_head *lists; 234 u_long mask; 235 } ifv_hash __cacheline_aligned = { 236 .lists = NULL, 237 .mask = 0, 238 }; 239 240 pserialize_t vlan_psz __read_mostly; 241 static struct psref_class *ifvm_psref_class __read_mostly; 242 243 struct if_clone vlan_cloner = 244 IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy); 245 246 /* Used to pad ethernet frames with < ETHER_MIN_LEN bytes */ 247 static char vlan_zero_pad_buff[ETHER_MIN_LEN]; 248 249 static inline int 250 vlan_safe_ifpromisc(struct ifnet *ifp, int pswitch) 251 { 252 int e; 253 254 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 255 e = ifpromisc(ifp, pswitch); 256 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 257 258 return e; 259 } 260 261 static inline int 262 vlan_safe_ifpromisc_locked(struct ifnet *ifp, int pswitch) 263 { 264 int e; 265 266 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 267 e = ifpromisc_locked(ifp, pswitch); 268 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 269 270 return e; 271 } 272 273 void 274 vlanattach(int n) 275 { 276 277 /* 278 * Nothing to do here, initialization is handled by the 279 * module initialization code in vlaninit() below. 280 */ 281 } 282 283 static void 284 vlaninit(void) 285 { 286 mutex_init(&ifv_list.lock, MUTEX_DEFAULT, IPL_NONE); 287 LIST_INIT(&ifv_list.list); 288 289 mutex_init(&ifv_hash.lock, MUTEX_DEFAULT, IPL_NONE); 290 vlan_psz = pserialize_create(); 291 ifvm_psref_class = psref_class_create("vlanlinkmib", IPL_SOFTNET); 292 if_clone_attach(&vlan_cloner); 293 294 vlan_hash_init(); 295 } 296 297 static int 298 vlandetach(void) 299 { 300 bool is_empty; 301 int error; 302 303 mutex_enter(&ifv_list.lock); 304 is_empty = LIST_EMPTY(&ifv_list.list); 305 mutex_exit(&ifv_list.lock); 306 307 if (!is_empty) 308 return EBUSY; 309 310 error = vlan_hash_fini(); 311 if (error != 0) 312 return error; 313 314 if_clone_detach(&vlan_cloner); 315 psref_class_destroy(ifvm_psref_class); 316 pserialize_destroy(vlan_psz); 317 mutex_destroy(&ifv_hash.lock); 318 mutex_destroy(&ifv_list.lock); 319 320 return 0; 321 } 322 323 static void 324 vlan_reset_linkname(struct ifnet *ifp) 325 { 326 327 /* 328 * We start out with a "802.1Q VLAN" type and zero-length 329 * addresses. When we attach to a parent interface, we 330 * inherit its type, address length, address, and data link 331 * type. 332 */ 333 334 ifp->if_type = IFT_L2VLAN; 335 ifp->if_addrlen = 0; 336 ifp->if_dlt = DLT_NULL; 337 if_alloc_sadl(ifp); 338 } 339 340 static int 341 vlan_clone_create(struct if_clone *ifc, int unit) 342 { 343 struct ifvlan *ifv; 344 struct ifnet *ifp; 345 struct ifvlan_linkmib *mib; 346 int rv; 347 348 ifv = malloc(sizeof(struct ifvlan), M_DEVBUF, M_WAITOK|M_ZERO); 349 mib = kmem_zalloc(sizeof(struct ifvlan_linkmib), KM_SLEEP); 350 ifp = &ifv->ifv_if; 351 LIST_INIT(&ifv->ifv_mc_listhead); 352 353 mib->ifvm_ifvlan = ifv; 354 mib->ifvm_p = NULL; 355 psref_target_init(&mib->ifvm_psref, ifvm_psref_class); 356 357 mutex_init(&ifv->ifv_lock, MUTEX_DEFAULT, IPL_NONE); 358 ifv->ifv_mib = mib; 359 360 mutex_enter(&ifv_list.lock); 361 LIST_INSERT_HEAD(&ifv_list.list, ifv, ifv_list); 362 mutex_exit(&ifv_list.lock); 363 364 if_initname(ifp, ifc->ifc_name, unit); 365 ifp->if_softc = ifv; 366 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 367 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 368 #ifdef NET_MPSAFE 369 ifp->if_extflags |= IFEF_MPSAFE; 370 #endif 371 ifp->if_start = vlan_start; 372 ifp->if_transmit = vlan_transmit; 373 ifp->if_ioctl = vlan_ioctl; 374 IFQ_SET_READY(&ifp->if_snd); 375 376 rv = if_initialize(ifp); 377 if (rv != 0) { 378 aprint_error("%s: if_initialize failed(%d)\n", ifp->if_xname, 379 rv); 380 goto fail; 381 } 382 383 vlan_reset_linkname(ifp); 384 if_register(ifp); 385 return 0; 386 387 fail: 388 mutex_enter(&ifv_list.lock); 389 LIST_REMOVE(ifv, ifv_list); 390 mutex_exit(&ifv_list.lock); 391 392 mutex_destroy(&ifv->ifv_lock); 393 psref_target_destroy(&ifv->ifv_mib->ifvm_psref, ifvm_psref_class); 394 kmem_free(ifv->ifv_mib, sizeof(struct ifvlan_linkmib)); 395 free(ifv, M_DEVBUF); 396 397 return rv; 398 } 399 400 static int 401 vlan_clone_destroy(struct ifnet *ifp) 402 { 403 struct ifvlan *ifv = ifp->if_softc; 404 405 mutex_enter(&ifv_list.lock); 406 LIST_REMOVE(ifv, ifv_list); 407 mutex_exit(&ifv_list.lock); 408 409 IFNET_LOCK(ifp); 410 vlan_unconfig(ifp); 411 IFNET_UNLOCK(ifp); 412 if_detach(ifp); 413 414 psref_target_destroy(&ifv->ifv_mib->ifvm_psref, ifvm_psref_class); 415 kmem_free(ifv->ifv_mib, sizeof(struct ifvlan_linkmib)); 416 mutex_destroy(&ifv->ifv_lock); 417 free(ifv, M_DEVBUF); 418 419 return 0; 420 } 421 422 /* 423 * Configure a VLAN interface. 424 */ 425 static int 426 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 427 { 428 struct ifnet *ifp = &ifv->ifv_if; 429 struct ifvlan_linkmib *nmib = NULL; 430 struct ifvlan_linkmib *omib = NULL; 431 struct ifvlan_linkmib *checkmib; 432 struct psref_target *nmib_psref = NULL; 433 const uint16_t vid = EVL_VLANOFTAG(tag); 434 int error = 0; 435 int idx; 436 bool omib_cleanup = false; 437 struct psref psref; 438 439 /* VLAN ID 0 and 4095 are reserved in the spec */ 440 if ((vid == 0) || (vid == 0xfff)) 441 return EINVAL; 442 443 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 444 mutex_enter(&ifv->ifv_lock); 445 omib = ifv->ifv_mib; 446 447 if (omib->ifvm_p != NULL) { 448 error = EBUSY; 449 goto done; 450 } 451 452 /* Duplicate check */ 453 checkmib = vlan_lookup_tag_psref(p, vid, &psref); 454 if (checkmib != NULL) { 455 vlan_putref_linkmib(checkmib, &psref); 456 error = EEXIST; 457 goto done; 458 } 459 460 *nmib = *omib; 461 nmib_psref = &nmib->ifvm_psref; 462 463 psref_target_init(nmib_psref, ifvm_psref_class); 464 465 switch (p->if_type) { 466 case IFT_ETHER: 467 { 468 struct ethercom *ec = (void *)p; 469 nmib->ifvm_msw = &vlan_ether_multisw; 470 nmib->ifvm_encaplen = ETHER_VLAN_ENCAP_LEN; 471 nmib->ifvm_mintu = ETHERMIN; 472 473 if (ec->ec_nvlans++ == 0) { 474 IFNET_LOCK(p); 475 error = ether_enable_vlan_mtu(p); 476 IFNET_UNLOCK(p); 477 if (error >= 0) { 478 if (error) { 479 ec->ec_nvlans--; 480 goto done; 481 } 482 nmib->ifvm_mtufudge = 0; 483 } else { 484 /* 485 * Fudge the MTU by the encapsulation size. This 486 * makes us incompatible with strictly compliant 487 * 802.1Q implementations, but allows us to use 488 * the feature with other NetBSD 489 * implementations, which might still be useful. 490 */ 491 nmib->ifvm_mtufudge = nmib->ifvm_encaplen; 492 } 493 error = 0; 494 } 495 496 /* 497 * If the parent interface can do hardware-assisted 498 * VLAN encapsulation, then propagate its hardware- 499 * assisted checksumming flags and tcp segmentation 500 * offload. 501 */ 502 if (ec->ec_capabilities & ETHERCAP_VLAN_HWTAGGING) { 503 ec->ec_capenable |= ETHERCAP_VLAN_HWTAGGING; 504 ifp->if_capabilities = p->if_capabilities & 505 (IFCAP_TSOv4 | IFCAP_TSOv6 | 506 IFCAP_CSUM_IPv4_Tx|IFCAP_CSUM_IPv4_Rx| 507 IFCAP_CSUM_TCPv4_Tx|IFCAP_CSUM_TCPv4_Rx| 508 IFCAP_CSUM_UDPv4_Tx|IFCAP_CSUM_UDPv4_Rx| 509 IFCAP_CSUM_TCPv6_Tx|IFCAP_CSUM_TCPv6_Rx| 510 IFCAP_CSUM_UDPv6_Tx|IFCAP_CSUM_UDPv6_Rx); 511 } 512 513 /* 514 * We inherit the parent's Ethernet address. 515 */ 516 ether_ifattach(ifp, CLLADDR(p->if_sadl)); 517 ifp->if_hdrlen = sizeof(struct ether_vlan_header); /* XXX? */ 518 break; 519 } 520 521 default: 522 error = EPROTONOSUPPORT; 523 goto done; 524 } 525 526 nmib->ifvm_p = p; 527 nmib->ifvm_tag = vid; 528 ifv->ifv_if.if_mtu = p->if_mtu - nmib->ifvm_mtufudge; 529 ifv->ifv_if.if_flags = p->if_flags & 530 (IFF_UP | IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 531 532 /* 533 * Inherit the if_type from the parent. This allows us 534 * to participate in bridges of that type. 535 */ 536 ifv->ifv_if.if_type = p->if_type; 537 538 PSLIST_ENTRY_INIT(ifv, ifv_hash); 539 idx = vlan_tag_hash(vid, ifv_hash.mask); 540 541 mutex_enter(&ifv_hash.lock); 542 PSLIST_WRITER_INSERT_HEAD(&ifv_hash.lists[idx], ifv, ifv_hash); 543 mutex_exit(&ifv_hash.lock); 544 545 vlan_linkmib_update(ifv, nmib); 546 nmib = NULL; 547 nmib_psref = NULL; 548 omib_cleanup = true; 549 550 done: 551 mutex_exit(&ifv->ifv_lock); 552 553 if (nmib_psref) 554 psref_target_destroy(nmib_psref, ifvm_psref_class); 555 if (nmib) 556 kmem_free(nmib, sizeof(*nmib)); 557 if (omib_cleanup) 558 kmem_free(omib, sizeof(*omib)); 559 560 return error; 561 } 562 563 /* 564 * Unconfigure a VLAN interface. 565 */ 566 static void 567 vlan_unconfig(struct ifnet *ifp) 568 { 569 struct ifvlan *ifv = ifp->if_softc; 570 struct ifvlan_linkmib *nmib = NULL; 571 int error; 572 573 KASSERT(IFNET_LOCKED(ifp)); 574 575 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 576 577 mutex_enter(&ifv->ifv_lock); 578 error = vlan_unconfig_locked(ifv, nmib); 579 mutex_exit(&ifv->ifv_lock); 580 581 if (error) 582 kmem_free(nmib, sizeof(*nmib)); 583 } 584 static int 585 vlan_unconfig_locked(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 586 { 587 struct ifnet *p; 588 struct ifnet *ifp = &ifv->ifv_if; 589 struct psref_target *nmib_psref = NULL; 590 struct ifvlan_linkmib *omib; 591 int error = 0; 592 593 KASSERT(IFNET_LOCKED(ifp)); 594 KASSERT(mutex_owned(&ifv->ifv_lock)); 595 596 ifp->if_flags &= ~(IFF_UP|IFF_RUNNING); 597 598 omib = ifv->ifv_mib; 599 p = omib->ifvm_p; 600 601 if (p == NULL) { 602 error = -1; 603 goto done; 604 } 605 606 *nmib = *omib; 607 nmib_psref = &nmib->ifvm_psref; 608 psref_target_init(nmib_psref, ifvm_psref_class); 609 610 /* 611 * Since the interface is being unconfigured, we need to empty the 612 * list of multicast groups that we may have joined while we were 613 * alive and remove them from the parent's list also. 614 */ 615 (*nmib->ifvm_msw->vmsw_purgemulti)(ifv); 616 617 /* Disconnect from parent. */ 618 switch (p->if_type) { 619 case IFT_ETHER: 620 { 621 struct ethercom *ec = (void *)p; 622 if (--ec->ec_nvlans == 0) { 623 IFNET_LOCK(p); 624 (void) ether_disable_vlan_mtu(p); 625 IFNET_UNLOCK(p); 626 } 627 628 /* XXX ether_ifdetach must not be called with IFNET_LOCK */ 629 mutex_exit(&ifv->ifv_lock); 630 IFNET_UNLOCK(ifp); 631 ether_ifdetach(ifp); 632 IFNET_LOCK(ifp); 633 mutex_enter(&ifv->ifv_lock); 634 635 /* Restore vlan_ioctl overwritten by ether_ifdetach */ 636 ifp->if_ioctl = vlan_ioctl; 637 vlan_reset_linkname(ifp); 638 break; 639 } 640 641 default: 642 panic("%s: impossible", __func__); 643 } 644 645 nmib->ifvm_p = NULL; 646 ifv->ifv_if.if_mtu = 0; 647 ifv->ifv_flags = 0; 648 649 mutex_enter(&ifv_hash.lock); 650 PSLIST_WRITER_REMOVE(ifv, ifv_hash); 651 pserialize_perform(vlan_psz); 652 mutex_exit(&ifv_hash.lock); 653 PSLIST_ENTRY_DESTROY(ifv, ifv_hash); 654 655 vlan_linkmib_update(ifv, nmib); 656 657 mutex_exit(&ifv->ifv_lock); 658 659 nmib_psref = NULL; 660 kmem_free(omib, sizeof(*omib)); 661 662 #ifdef INET6 663 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 664 /* To delete v6 link local addresses */ 665 if (in6_present) 666 in6_ifdetach(ifp); 667 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 668 #endif 669 670 if ((ifp->if_flags & IFF_PROMISC) != 0) 671 vlan_safe_ifpromisc_locked(ifp, 0); 672 if_down_locked(ifp); 673 ifp->if_capabilities = 0; 674 mutex_enter(&ifv->ifv_lock); 675 done: 676 677 if (nmib_psref) 678 psref_target_destroy(nmib_psref, ifvm_psref_class); 679 680 return error; 681 } 682 683 static void 684 vlan_hash_init(void) 685 { 686 687 ifv_hash.lists = hashinit(VLAN_TAG_HASH_SIZE, HASH_PSLIST, true, 688 &ifv_hash.mask); 689 } 690 691 static int 692 vlan_hash_fini(void) 693 { 694 int i; 695 696 mutex_enter(&ifv_hash.lock); 697 698 for (i = 0; i < ifv_hash.mask + 1; i++) { 699 if (PSLIST_WRITER_FIRST(&ifv_hash.lists[i], struct ifvlan, 700 ifv_hash) != NULL) { 701 mutex_exit(&ifv_hash.lock); 702 return EBUSY; 703 } 704 } 705 706 for (i = 0; i < ifv_hash.mask + 1; i++) 707 PSLIST_DESTROY(&ifv_hash.lists[i]); 708 709 mutex_exit(&ifv_hash.lock); 710 711 hashdone(ifv_hash.lists, HASH_PSLIST, ifv_hash.mask); 712 713 ifv_hash.lists = NULL; 714 ifv_hash.mask = 0; 715 716 return 0; 717 } 718 719 static int 720 vlan_tag_hash(uint16_t tag, u_long mask) 721 { 722 uint32_t hash; 723 724 hash = (tag >> 8) ^ tag; 725 hash = (hash >> 2) ^ hash; 726 727 return hash & mask; 728 } 729 730 static struct ifvlan_linkmib * 731 vlan_getref_linkmib(struct ifvlan *sc, struct psref *psref) 732 { 733 struct ifvlan_linkmib *mib; 734 int s; 735 736 s = pserialize_read_enter(); 737 mib = sc->ifv_mib; 738 if (mib == NULL) { 739 pserialize_read_exit(s); 740 return NULL; 741 } 742 membar_datadep_consumer(); 743 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 744 pserialize_read_exit(s); 745 746 return mib; 747 } 748 749 static void 750 vlan_putref_linkmib(struct ifvlan_linkmib *mib, struct psref *psref) 751 { 752 if (mib == NULL) 753 return; 754 psref_release(psref, &mib->ifvm_psref, ifvm_psref_class); 755 } 756 757 static struct ifvlan_linkmib * 758 vlan_lookup_tag_psref(struct ifnet *ifp, uint16_t tag, struct psref *psref) 759 { 760 int idx; 761 int s; 762 struct ifvlan *sc; 763 764 idx = vlan_tag_hash(tag, ifv_hash.mask); 765 766 s = pserialize_read_enter(); 767 PSLIST_READER_FOREACH(sc, &ifv_hash.lists[idx], struct ifvlan, 768 ifv_hash) { 769 struct ifvlan_linkmib *mib = sc->ifv_mib; 770 if (mib == NULL) 771 continue; 772 if (mib->ifvm_tag != tag) 773 continue; 774 if (mib->ifvm_p != ifp) 775 continue; 776 777 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 778 pserialize_read_exit(s); 779 return mib; 780 } 781 pserialize_read_exit(s); 782 return NULL; 783 } 784 785 static void 786 vlan_linkmib_update(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 787 { 788 struct ifvlan_linkmib *omib = ifv->ifv_mib; 789 790 KASSERT(mutex_owned(&ifv->ifv_lock)); 791 792 membar_producer(); 793 ifv->ifv_mib = nmib; 794 795 pserialize_perform(vlan_psz); 796 psref_target_destroy(&omib->ifvm_psref, ifvm_psref_class); 797 } 798 799 /* 800 * Called when a parent interface is detaching; destroy any VLAN 801 * configuration for the parent interface. 802 */ 803 void 804 vlan_ifdetach(struct ifnet *p) 805 { 806 struct ifvlan *ifv; 807 struct ifvlan_linkmib *mib, **nmibs; 808 struct psref psref; 809 int error; 810 int bound; 811 int i, cnt = 0; 812 813 bound = curlwp_bind(); 814 815 mutex_enter(&ifv_list.lock); 816 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 817 mib = vlan_getref_linkmib(ifv, &psref); 818 if (mib == NULL) 819 continue; 820 821 if (mib->ifvm_p == p) 822 cnt++; 823 824 vlan_putref_linkmib(mib, &psref); 825 } 826 mutex_exit(&ifv_list.lock); 827 828 if (cnt == 0) { 829 curlwp_bindx(bound); 830 return; 831 } 832 833 /* 834 * The value of "cnt" does not increase while ifv_list.lock 835 * and ifv->ifv_lock are released here, because the parent 836 * interface is detaching. 837 */ 838 nmibs = kmem_alloc(sizeof(*nmibs) * cnt, KM_SLEEP); 839 for (i = 0; i < cnt; i++) { 840 nmibs[i] = kmem_alloc(sizeof(*nmibs[i]), KM_SLEEP); 841 } 842 843 mutex_enter(&ifv_list.lock); 844 845 i = 0; 846 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 847 struct ifnet *ifp = &ifv->ifv_if; 848 849 /* IFNET_LOCK must be held before ifv_lock. */ 850 IFNET_LOCK(ifp); 851 mutex_enter(&ifv->ifv_lock); 852 853 /* XXX ifv_mib = NULL? */ 854 if (ifv->ifv_mib->ifvm_p == p) { 855 KASSERTMSG(i < cnt, "no memory for unconfig, parent=%s", 856 p->if_xname); 857 error = vlan_unconfig_locked(ifv, nmibs[i]); 858 if (!error) { 859 nmibs[i] = NULL; 860 i++; 861 } 862 863 } 864 865 mutex_exit(&ifv->ifv_lock); 866 IFNET_UNLOCK(ifp); 867 } 868 869 mutex_exit(&ifv_list.lock); 870 871 curlwp_bindx(bound); 872 873 for (i = 0; i < cnt; i++) { 874 if (nmibs[i]) 875 kmem_free(nmibs[i], sizeof(*nmibs[i])); 876 } 877 878 kmem_free(nmibs, sizeof(*nmibs) * cnt); 879 880 return; 881 } 882 883 static int 884 vlan_set_promisc(struct ifnet *ifp) 885 { 886 struct ifvlan *ifv = ifp->if_softc; 887 struct ifvlan_linkmib *mib; 888 struct psref psref; 889 int error = 0; 890 int bound; 891 892 bound = curlwp_bind(); 893 mib = vlan_getref_linkmib(ifv, &psref); 894 if (mib == NULL) { 895 curlwp_bindx(bound); 896 return EBUSY; 897 } 898 899 if ((ifp->if_flags & IFF_PROMISC) != 0) { 900 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) { 901 error = vlan_safe_ifpromisc(mib->ifvm_p, 1); 902 if (error == 0) 903 ifv->ifv_flags |= IFVF_PROMISC; 904 } 905 } else { 906 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) { 907 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 908 if (error == 0) 909 ifv->ifv_flags &= ~IFVF_PROMISC; 910 } 911 } 912 vlan_putref_linkmib(mib, &psref); 913 curlwp_bindx(bound); 914 915 return error; 916 } 917 918 static int 919 vlan_ioctl(struct ifnet *ifp, u_long cmd, void *data) 920 { 921 struct lwp *l = curlwp; 922 struct ifvlan *ifv = ifp->if_softc; 923 struct ifaddr *ifa = (struct ifaddr *) data; 924 struct ifreq *ifr = (struct ifreq *) data; 925 struct ifnet *pr; 926 struct ifcapreq *ifcr; 927 struct vlanreq vlr; 928 struct ifvlan_linkmib *mib; 929 struct psref psref; 930 int error = 0; 931 int bound; 932 933 switch (cmd) { 934 case SIOCSIFMTU: 935 bound = curlwp_bind(); 936 mib = vlan_getref_linkmib(ifv, &psref); 937 if (mib == NULL) { 938 curlwp_bindx(bound); 939 error = EBUSY; 940 break; 941 } 942 943 if (mib->ifvm_p == NULL) { 944 vlan_putref_linkmib(mib, &psref); 945 curlwp_bindx(bound); 946 error = EINVAL; 947 } else if ( 948 ifr->ifr_mtu > (mib->ifvm_p->if_mtu - mib->ifvm_mtufudge) || 949 ifr->ifr_mtu < (mib->ifvm_mintu - mib->ifvm_mtufudge)) { 950 vlan_putref_linkmib(mib, &psref); 951 curlwp_bindx(bound); 952 error = EINVAL; 953 } else { 954 vlan_putref_linkmib(mib, &psref); 955 curlwp_bindx(bound); 956 957 error = ifioctl_common(ifp, cmd, data); 958 if (error == ENETRESET) 959 error = 0; 960 } 961 962 break; 963 964 case SIOCSETVLAN: 965 if ((error = kauth_authorize_network(l->l_cred, 966 KAUTH_NETWORK_INTERFACE, 967 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 968 NULL)) != 0) 969 break; 970 if ((error = copyin(ifr->ifr_data, &vlr, sizeof(vlr))) != 0) 971 break; 972 973 if (vlr.vlr_parent[0] == '\0') { 974 bound = curlwp_bind(); 975 mib = vlan_getref_linkmib(ifv, &psref); 976 if (mib == NULL) { 977 curlwp_bindx(bound); 978 error = EBUSY; 979 break; 980 } 981 982 if (mib->ifvm_p != NULL && 983 (ifp->if_flags & IFF_PROMISC) != 0) 984 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 985 986 vlan_putref_linkmib(mib, &psref); 987 curlwp_bindx(bound); 988 989 vlan_unconfig(ifp); 990 break; 991 } 992 if (vlr.vlr_tag != EVL_VLANOFTAG(vlr.vlr_tag)) { 993 error = EINVAL; /* check for valid tag */ 994 break; 995 } 996 if ((pr = ifunit(vlr.vlr_parent)) == NULL) { 997 error = ENOENT; 998 break; 999 } 1000 error = vlan_config(ifv, pr, vlr.vlr_tag); 1001 if (error != 0) { 1002 break; 1003 } 1004 1005 /* Update promiscuous mode, if necessary. */ 1006 vlan_set_promisc(ifp); 1007 1008 ifp->if_flags |= IFF_RUNNING; 1009 break; 1010 1011 case SIOCGETVLAN: 1012 memset(&vlr, 0, sizeof(vlr)); 1013 bound = curlwp_bind(); 1014 mib = vlan_getref_linkmib(ifv, &psref); 1015 if (mib == NULL) { 1016 curlwp_bindx(bound); 1017 error = EBUSY; 1018 break; 1019 } 1020 if (mib->ifvm_p != NULL) { 1021 snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent), "%s", 1022 mib->ifvm_p->if_xname); 1023 vlr.vlr_tag = mib->ifvm_tag; 1024 } 1025 vlan_putref_linkmib(mib, &psref); 1026 curlwp_bindx(bound); 1027 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1028 break; 1029 1030 case SIOCSIFFLAGS: 1031 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1032 break; 1033 /* 1034 * For promiscuous mode, we enable promiscuous mode on 1035 * the parent if we need promiscuous on the VLAN interface. 1036 */ 1037 bound = curlwp_bind(); 1038 mib = vlan_getref_linkmib(ifv, &psref); 1039 if (mib == NULL) { 1040 curlwp_bindx(bound); 1041 error = EBUSY; 1042 break; 1043 } 1044 1045 if (mib->ifvm_p != NULL) 1046 error = vlan_set_promisc(ifp); 1047 vlan_putref_linkmib(mib, &psref); 1048 curlwp_bindx(bound); 1049 break; 1050 1051 case SIOCADDMULTI: 1052 mutex_enter(&ifv->ifv_lock); 1053 mib = ifv->ifv_mib; 1054 if (mib == NULL) { 1055 error = EBUSY; 1056 mutex_exit(&ifv->ifv_lock); 1057 break; 1058 } 1059 1060 error = (mib->ifvm_p != NULL) ? 1061 (*mib->ifvm_msw->vmsw_addmulti)(ifv, ifr) : EINVAL; 1062 mib = NULL; 1063 mutex_exit(&ifv->ifv_lock); 1064 break; 1065 1066 case SIOCDELMULTI: 1067 mutex_enter(&ifv->ifv_lock); 1068 mib = ifv->ifv_mib; 1069 if (mib == NULL) { 1070 error = EBUSY; 1071 mutex_exit(&ifv->ifv_lock); 1072 break; 1073 } 1074 error = (mib->ifvm_p != NULL) ? 1075 (*mib->ifvm_msw->vmsw_delmulti)(ifv, ifr) : EINVAL; 1076 mib = NULL; 1077 mutex_exit(&ifv->ifv_lock); 1078 break; 1079 1080 case SIOCSIFCAP: 1081 ifcr = data; 1082 /* make sure caps are enabled on parent */ 1083 bound = curlwp_bind(); 1084 mib = vlan_getref_linkmib(ifv, &psref); 1085 if (mib == NULL) { 1086 curlwp_bindx(bound); 1087 error = EBUSY; 1088 break; 1089 } 1090 1091 if (mib->ifvm_p == NULL) { 1092 vlan_putref_linkmib(mib, &psref); 1093 curlwp_bindx(bound); 1094 error = EINVAL; 1095 break; 1096 } 1097 if ((mib->ifvm_p->if_capenable & ifcr->ifcr_capenable) != 1098 ifcr->ifcr_capenable) { 1099 vlan_putref_linkmib(mib, &psref); 1100 curlwp_bindx(bound); 1101 error = EINVAL; 1102 break; 1103 } 1104 1105 vlan_putref_linkmib(mib, &psref); 1106 curlwp_bindx(bound); 1107 1108 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1109 error = 0; 1110 break; 1111 case SIOCINITIFADDR: 1112 bound = curlwp_bind(); 1113 mib = vlan_getref_linkmib(ifv, &psref); 1114 if (mib == NULL) { 1115 curlwp_bindx(bound); 1116 error = EBUSY; 1117 break; 1118 } 1119 1120 if (mib->ifvm_p == NULL) { 1121 error = EINVAL; 1122 vlan_putref_linkmib(mib, &psref); 1123 curlwp_bindx(bound); 1124 break; 1125 } 1126 vlan_putref_linkmib(mib, &psref); 1127 curlwp_bindx(bound); 1128 1129 ifp->if_flags |= IFF_UP; 1130 #ifdef INET 1131 if (ifa->ifa_addr->sa_family == AF_INET) 1132 arp_ifinit(ifp, ifa); 1133 #endif 1134 break; 1135 1136 default: 1137 error = ether_ioctl(ifp, cmd, data); 1138 } 1139 1140 return error; 1141 } 1142 1143 static int 1144 vlan_ether_addmulti(struct ifvlan *ifv, struct ifreq *ifr) 1145 { 1146 const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr); 1147 struct vlan_mc_entry *mc; 1148 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1149 struct ifvlan_linkmib *mib; 1150 int error; 1151 1152 KASSERT(mutex_owned(&ifv->ifv_lock)); 1153 1154 if (sa->sa_len > sizeof(struct sockaddr_storage)) 1155 return EINVAL; 1156 1157 error = ether_addmulti(sa, &ifv->ifv_ec); 1158 if (error != ENETRESET) 1159 return error; 1160 1161 /* 1162 * This is a new multicast address. We have to tell parent 1163 * about it. Also, remember this multicast address so that 1164 * we can delete it on unconfigure. 1165 */ 1166 mc = malloc(sizeof(struct vlan_mc_entry), M_DEVBUF, M_NOWAIT); 1167 if (mc == NULL) { 1168 error = ENOMEM; 1169 goto alloc_failed; 1170 } 1171 1172 /* 1173 * Since ether_addmulti() returned ENETRESET, the following two 1174 * statements shouldn't fail. Here ifv_ec is implicitly protected 1175 * by the ifv_lock lock. 1176 */ 1177 error = ether_multiaddr(sa, addrlo, addrhi); 1178 KASSERT(error == 0); 1179 1180 ETHER_LOCK(&ifv->ifv_ec); 1181 mc->mc_enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1182 ETHER_UNLOCK(&ifv->ifv_ec); 1183 1184 KASSERT(mc->mc_enm != NULL); 1185 1186 memcpy(&mc->mc_addr, sa, sa->sa_len); 1187 LIST_INSERT_HEAD(&ifv->ifv_mc_listhead, mc, mc_entries); 1188 1189 mib = ifv->ifv_mib; 1190 1191 KERNEL_LOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1192 IFNET_LOCK(mib->ifvm_p); 1193 error = if_mcast_op(mib->ifvm_p, SIOCADDMULTI, sa); 1194 IFNET_UNLOCK(mib->ifvm_p); 1195 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1196 1197 if (error != 0) 1198 goto ioctl_failed; 1199 return error; 1200 1201 ioctl_failed: 1202 LIST_REMOVE(mc, mc_entries); 1203 free(mc, M_DEVBUF); 1204 1205 alloc_failed: 1206 (void)ether_delmulti(sa, &ifv->ifv_ec); 1207 return error; 1208 } 1209 1210 static int 1211 vlan_ether_delmulti(struct ifvlan *ifv, struct ifreq *ifr) 1212 { 1213 const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr); 1214 struct ether_multi *enm; 1215 struct vlan_mc_entry *mc; 1216 struct ifvlan_linkmib *mib; 1217 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1218 int error; 1219 1220 KASSERT(mutex_owned(&ifv->ifv_lock)); 1221 1222 /* 1223 * Find a key to lookup vlan_mc_entry. We have to do this 1224 * before calling ether_delmulti for obvious reasons. 1225 */ 1226 if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0) 1227 return error; 1228 1229 ETHER_LOCK(&ifv->ifv_ec); 1230 enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1231 ETHER_UNLOCK(&ifv->ifv_ec); 1232 if (enm == NULL) 1233 return EINVAL; 1234 1235 LIST_FOREACH(mc, &ifv->ifv_mc_listhead, mc_entries) { 1236 if (mc->mc_enm == enm) 1237 break; 1238 } 1239 1240 /* We woun't delete entries we didn't add */ 1241 if (mc == NULL) 1242 return EINVAL; 1243 1244 error = ether_delmulti(sa, &ifv->ifv_ec); 1245 if (error != ENETRESET) 1246 return error; 1247 1248 /* We no longer use this multicast address. Tell parent so. */ 1249 mib = ifv->ifv_mib; 1250 IFNET_LOCK(mib->ifvm_p); 1251 error = if_mcast_op(mib->ifvm_p, SIOCDELMULTI, sa); 1252 IFNET_UNLOCK(mib->ifvm_p); 1253 1254 if (error == 0) { 1255 /* And forget about this address. */ 1256 LIST_REMOVE(mc, mc_entries); 1257 free(mc, M_DEVBUF); 1258 } else { 1259 (void)ether_addmulti(sa, &ifv->ifv_ec); 1260 } 1261 1262 return error; 1263 } 1264 1265 /* 1266 * Delete any multicast address we have asked to add from parent 1267 * interface. Called when the vlan is being unconfigured. 1268 */ 1269 static void 1270 vlan_ether_purgemulti(struct ifvlan *ifv) 1271 { 1272 struct vlan_mc_entry *mc; 1273 struct ifvlan_linkmib *mib; 1274 1275 KASSERT(mutex_owned(&ifv->ifv_lock)); 1276 mib = ifv->ifv_mib; 1277 if (mib == NULL) { 1278 return; 1279 } 1280 1281 while ((mc = LIST_FIRST(&ifv->ifv_mc_listhead)) != NULL) { 1282 IFNET_LOCK(mib->ifvm_p); 1283 (void)if_mcast_op(mib->ifvm_p, SIOCDELMULTI, 1284 sstocsa(&mc->mc_addr)); 1285 IFNET_UNLOCK(mib->ifvm_p); 1286 LIST_REMOVE(mc, mc_entries); 1287 free(mc, M_DEVBUF); 1288 } 1289 } 1290 1291 static void 1292 vlan_start(struct ifnet *ifp) 1293 { 1294 struct ifvlan *ifv = ifp->if_softc; 1295 struct ifnet *p; 1296 struct ethercom *ec; 1297 struct mbuf *m; 1298 struct ifvlan_linkmib *mib; 1299 struct psref psref; 1300 int error; 1301 1302 mib = vlan_getref_linkmib(ifv, &psref); 1303 if (mib == NULL) 1304 return; 1305 p = mib->ifvm_p; 1306 ec = (void *)mib->ifvm_p; 1307 1308 ifp->if_flags |= IFF_OACTIVE; 1309 1310 for (;;) { 1311 IFQ_DEQUEUE(&ifp->if_snd, m); 1312 if (m == NULL) 1313 break; 1314 1315 #ifdef ALTQ 1316 /* 1317 * KERNEL_LOCK is required for ALTQ even if NET_MPSAFE is 1318 * defined. 1319 */ 1320 KERNEL_LOCK(1, NULL); 1321 /* 1322 * If ALTQ is enabled on the parent interface, do 1323 * classification; the queueing discipline might 1324 * not require classification, but might require 1325 * the address family/header pointer in the pktattr. 1326 */ 1327 if (ALTQ_IS_ENABLED(&p->if_snd)) { 1328 switch (p->if_type) { 1329 case IFT_ETHER: 1330 altq_etherclassify(&p->if_snd, m); 1331 break; 1332 default: 1333 panic("%s: impossible (altq)", __func__); 1334 } 1335 } 1336 KERNEL_UNLOCK_ONE(NULL); 1337 #endif /* ALTQ */ 1338 1339 bpf_mtap(ifp, m); 1340 /* 1341 * If the parent can insert the tag itself, just mark 1342 * the tag in the mbuf header. 1343 */ 1344 if (ec->ec_capabilities & ETHERCAP_VLAN_HWTAGGING) { 1345 vlan_set_tag(m, mib->ifvm_tag); 1346 } else { 1347 /* 1348 * insert the tag ourselves 1349 */ 1350 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1351 if (m == NULL) { 1352 printf("%s: unable to prepend encap header", 1353 p->if_xname); 1354 ifp->if_oerrors++; 1355 continue; 1356 } 1357 1358 switch (p->if_type) { 1359 case IFT_ETHER: 1360 { 1361 struct ether_vlan_header *evl; 1362 1363 if (m->m_len < sizeof(struct ether_vlan_header)) 1364 m = m_pullup(m, 1365 sizeof(struct ether_vlan_header)); 1366 if (m == NULL) { 1367 printf("%s: unable to pullup encap " 1368 "header", p->if_xname); 1369 ifp->if_oerrors++; 1370 continue; 1371 } 1372 1373 /* 1374 * Transform the Ethernet header into an 1375 * Ethernet header with 802.1Q encapsulation. 1376 */ 1377 memmove(mtod(m, void *), 1378 mtod(m, char *) + mib->ifvm_encaplen, 1379 sizeof(struct ether_header)); 1380 evl = mtod(m, struct ether_vlan_header *); 1381 evl->evl_proto = evl->evl_encap_proto; 1382 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1383 evl->evl_tag = htons(mib->ifvm_tag); 1384 1385 /* 1386 * To cater for VLAN-aware layer 2 ethernet 1387 * switches which may need to strip the tag 1388 * before forwarding the packet, make sure 1389 * the packet+tag is at least 68 bytes long. 1390 * This is necessary because our parent will 1391 * only pad to 64 bytes (ETHER_MIN_LEN) and 1392 * some switches will not pad by themselves 1393 * after deleting a tag. 1394 */ 1395 const size_t min_data_len = ETHER_MIN_LEN - 1396 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1397 if (m->m_pkthdr.len < min_data_len) { 1398 m_copyback(m, m->m_pkthdr.len, 1399 min_data_len - m->m_pkthdr.len, 1400 vlan_zero_pad_buff); 1401 } 1402 break; 1403 } 1404 1405 default: 1406 panic("%s: impossible", __func__); 1407 } 1408 } 1409 1410 if ((p->if_flags & IFF_RUNNING) == 0) { 1411 m_freem(m); 1412 continue; 1413 } 1414 1415 error = if_transmit_lock(p, m); 1416 if (error) { 1417 /* mbuf is already freed */ 1418 ifp->if_oerrors++; 1419 continue; 1420 } 1421 ifp->if_opackets++; 1422 } 1423 1424 ifp->if_flags &= ~IFF_OACTIVE; 1425 1426 /* Remove reference to mib before release */ 1427 vlan_putref_linkmib(mib, &psref); 1428 } 1429 1430 static int 1431 vlan_transmit(struct ifnet *ifp, struct mbuf *m) 1432 { 1433 struct ifvlan *ifv = ifp->if_softc; 1434 struct ifnet *p; 1435 struct ethercom *ec; 1436 struct ifvlan_linkmib *mib; 1437 struct psref psref; 1438 int error; 1439 size_t pktlen = m->m_pkthdr.len; 1440 bool mcast = (m->m_flags & M_MCAST) != 0; 1441 1442 mib = vlan_getref_linkmib(ifv, &psref); 1443 if (mib == NULL) { 1444 m_freem(m); 1445 return ENETDOWN; 1446 } 1447 1448 p = mib->ifvm_p; 1449 ec = (void *)mib->ifvm_p; 1450 1451 bpf_mtap(ifp, m); 1452 1453 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 1454 goto out; 1455 if (m == NULL) 1456 goto out; 1457 1458 /* 1459 * If the parent can insert the tag itself, just mark 1460 * the tag in the mbuf header. 1461 */ 1462 if (ec->ec_capabilities & ETHERCAP_VLAN_HWTAGGING) { 1463 vlan_set_tag(m, mib->ifvm_tag); 1464 } else { 1465 /* 1466 * insert the tag ourselves 1467 */ 1468 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1469 if (m == NULL) { 1470 printf("%s: unable to prepend encap header", 1471 p->if_xname); 1472 ifp->if_oerrors++; 1473 error = ENOBUFS; 1474 goto out; 1475 } 1476 1477 switch (p->if_type) { 1478 case IFT_ETHER: 1479 { 1480 struct ether_vlan_header *evl; 1481 1482 if (m->m_len < sizeof(struct ether_vlan_header)) 1483 m = m_pullup(m, 1484 sizeof(struct ether_vlan_header)); 1485 if (m == NULL) { 1486 printf("%s: unable to pullup encap " 1487 "header", p->if_xname); 1488 ifp->if_oerrors++; 1489 error = ENOBUFS; 1490 goto out; 1491 } 1492 1493 /* 1494 * Transform the Ethernet header into an 1495 * Ethernet header with 802.1Q encapsulation. 1496 */ 1497 memmove(mtod(m, void *), 1498 mtod(m, char *) + mib->ifvm_encaplen, 1499 sizeof(struct ether_header)); 1500 evl = mtod(m, struct ether_vlan_header *); 1501 evl->evl_proto = evl->evl_encap_proto; 1502 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1503 evl->evl_tag = htons(mib->ifvm_tag); 1504 1505 /* 1506 * To cater for VLAN-aware layer 2 ethernet 1507 * switches which may need to strip the tag 1508 * before forwarding the packet, make sure 1509 * the packet+tag is at least 68 bytes long. 1510 * This is necessary because our parent will 1511 * only pad to 64 bytes (ETHER_MIN_LEN) and 1512 * some switches will not pad by themselves 1513 * after deleting a tag. 1514 */ 1515 const size_t min_data_len = ETHER_MIN_LEN - 1516 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1517 if (m->m_pkthdr.len < min_data_len) { 1518 m_copyback(m, m->m_pkthdr.len, 1519 min_data_len - m->m_pkthdr.len, 1520 vlan_zero_pad_buff); 1521 } 1522 break; 1523 } 1524 1525 default: 1526 panic("%s: impossible", __func__); 1527 } 1528 } 1529 1530 if ((p->if_flags & IFF_RUNNING) == 0) { 1531 m_freem(m); 1532 error = ENETDOWN; 1533 goto out; 1534 } 1535 1536 error = if_transmit_lock(p, m); 1537 if (error) { 1538 /* mbuf is already freed */ 1539 ifp->if_oerrors++; 1540 } else { 1541 1542 ifp->if_opackets++; 1543 ifp->if_obytes += pktlen; 1544 if (mcast) 1545 ifp->if_omcasts++; 1546 } 1547 1548 out: 1549 /* Remove reference to mib before release */ 1550 vlan_putref_linkmib(mib, &psref); 1551 return error; 1552 } 1553 1554 /* 1555 * Given an Ethernet frame, find a valid vlan interface corresponding to the 1556 * given source interface and tag, then run the real packet through the 1557 * parent's input routine. 1558 */ 1559 void 1560 vlan_input(struct ifnet *ifp, struct mbuf *m) 1561 { 1562 struct ifvlan *ifv; 1563 uint16_t vid; 1564 struct ifvlan_linkmib *mib; 1565 struct psref psref; 1566 bool have_vtag; 1567 1568 have_vtag = vlan_has_tag(m); 1569 if (have_vtag) { 1570 vid = EVL_VLANOFTAG(vlan_get_tag(m)); 1571 m->m_flags &= ~M_VLANTAG; 1572 } else { 1573 struct ether_vlan_header *evl; 1574 1575 if (ifp->if_type != IFT_ETHER) { 1576 panic("%s: impossible", __func__); 1577 } 1578 1579 if (m->m_len < sizeof(struct ether_vlan_header) && 1580 (m = m_pullup(m, 1581 sizeof(struct ether_vlan_header))) == NULL) { 1582 printf("%s: no memory for VLAN header, " 1583 "dropping packet.\n", ifp->if_xname); 1584 return; 1585 } 1586 evl = mtod(m, struct ether_vlan_header *); 1587 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN); 1588 1589 vid = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1590 1591 /* 1592 * Restore the original ethertype. We'll remove 1593 * the encapsulation after we've found the vlan 1594 * interface corresponding to the tag. 1595 */ 1596 evl->evl_encap_proto = evl->evl_proto; 1597 } 1598 1599 mib = vlan_lookup_tag_psref(ifp, vid, &psref); 1600 if (mib == NULL) { 1601 m_freem(m); 1602 ifp->if_noproto++; 1603 return; 1604 } 1605 KASSERT(mib->ifvm_encaplen == ETHER_VLAN_ENCAP_LEN); 1606 1607 ifv = mib->ifvm_ifvlan; 1608 if ((ifv->ifv_if.if_flags & (IFF_UP|IFF_RUNNING)) != 1609 (IFF_UP|IFF_RUNNING)) { 1610 m_freem(m); 1611 ifp->if_noproto++; 1612 goto out; 1613 } 1614 1615 /* 1616 * Now, remove the encapsulation header. The original 1617 * header has already been fixed up above. 1618 */ 1619 if (!have_vtag) { 1620 memmove(mtod(m, char *) + mib->ifvm_encaplen, 1621 mtod(m, void *), sizeof(struct ether_header)); 1622 m_adj(m, mib->ifvm_encaplen); 1623 } 1624 1625 m_set_rcvif(m, &ifv->ifv_if); 1626 ifv->ifv_if.if_ipackets++; 1627 1628 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 1629 goto out; 1630 if (m == NULL) 1631 goto out; 1632 1633 m->m_flags &= ~M_PROMISC; 1634 if_input(&ifv->ifv_if, m); 1635 out: 1636 vlan_putref_linkmib(mib, &psref); 1637 } 1638 1639 /* 1640 * Module infrastructure 1641 */ 1642 #include "if_module.h" 1643 1644 IF_MODULE(MODULE_CLASS_DRIVER, vlan, "") 1645
Indexes created Sun Oct 12 09:09:55 GMT 2025