if_vlan.c revision 1.147
1 /* $NetBSD: if_vlan.c,v 1.147 2019/10/21 06:26:12 ozaki-r 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 1.147 2019/10/21 06:26:12 ozaki-r 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 struct ether_multi *mc_enm; 134 struct sockaddr_storage mc_addr; 135 }; 136 137 struct ifvlan_linkmib { 138 struct ifvlan *ifvm_ifvlan; 139 const struct vlan_multisw *ifvm_msw; 140 int ifvm_encaplen; /* encapsulation length */ 141 int ifvm_mtufudge; /* MTU fudged by this much */ 142 int ifvm_mintu; /* min transmission unit */ 143 uint16_t ifvm_proto; /* encapsulation ethertype */ 144 uint16_t ifvm_tag; /* tag to apply on packets */ 145 struct ifnet *ifvm_p; /* parent interface of this vlan */ 146 147 struct psref_target ifvm_psref; 148 }; 149 150 struct ifvlan { 151 struct ethercom ifv_ec; 152 struct ifvlan_linkmib *ifv_mib; /* 153 * reader must use vlan_getref_linkmib() 154 * instead of direct dereference 155 */ 156 kmutex_t ifv_lock; /* writer lock for ifv_mib */ 157 pserialize_t ifv_psz; 158 159 LIST_HEAD(__vlan_mchead, vlan_mc_entry) ifv_mc_listhead; 160 LIST_ENTRY(ifvlan) ifv_list; 161 struct pslist_entry ifv_hash; 162 int ifv_flags; 163 }; 164 165 #define IFVF_PROMISC 0x01 /* promiscuous mode enabled */ 166 167 #define ifv_if ifv_ec.ec_if 168 169 #define ifv_msw ifv_mib.ifvm_msw 170 #define ifv_encaplen ifv_mib.ifvm_encaplen 171 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 172 #define ifv_mintu ifv_mib.ifvm_mintu 173 #define ifv_tag ifv_mib.ifvm_tag 174 175 struct vlan_multisw { 176 int (*vmsw_addmulti)(struct ifvlan *, struct ifreq *); 177 int (*vmsw_delmulti)(struct ifvlan *, struct ifreq *); 178 void (*vmsw_purgemulti)(struct ifvlan *); 179 }; 180 181 static int vlan_ether_addmulti(struct ifvlan *, struct ifreq *); 182 static int vlan_ether_delmulti(struct ifvlan *, struct ifreq *); 183 static void vlan_ether_purgemulti(struct ifvlan *); 184 185 const struct vlan_multisw vlan_ether_multisw = { 186 .vmsw_addmulti = vlan_ether_addmulti, 187 .vmsw_delmulti = vlan_ether_delmulti, 188 .vmsw_purgemulti = vlan_ether_purgemulti, 189 }; 190 191 static int vlan_clone_create(struct if_clone *, int); 192 static int vlan_clone_destroy(struct ifnet *); 193 static int vlan_config(struct ifvlan *, struct ifnet *, uint16_t); 194 static int vlan_ioctl(struct ifnet *, u_long, void *); 195 static void vlan_start(struct ifnet *); 196 static int vlan_transmit(struct ifnet *, struct mbuf *); 197 static void vlan_unconfig(struct ifnet *); 198 static int vlan_unconfig_locked(struct ifvlan *, struct ifvlan_linkmib *); 199 static void vlan_hash_init(void); 200 static int vlan_hash_fini(void); 201 static int vlan_tag_hash(uint16_t, u_long); 202 static struct ifvlan_linkmib* vlan_getref_linkmib(struct ifvlan *, 203 struct psref *); 204 static void vlan_putref_linkmib(struct ifvlan_linkmib *, struct psref *); 205 static void vlan_linkmib_update(struct ifvlan *, struct ifvlan_linkmib *); 206 static struct ifvlan_linkmib* vlan_lookup_tag_psref(struct ifnet *, 207 uint16_t, struct psref *); 208 209 static struct { 210 kmutex_t lock; 211 LIST_HEAD(vlan_ifvlist, ifvlan) list; 212 } ifv_list __cacheline_aligned; 213 214 215 #if !defined(VLAN_TAG_HASH_SIZE) 216 #define VLAN_TAG_HASH_SIZE 32 217 #endif 218 static struct { 219 kmutex_t lock; 220 struct pslist_head *lists; 221 u_long mask; 222 } ifv_hash __cacheline_aligned = { 223 .lists = NULL, 224 .mask = 0, 225 }; 226 227 pserialize_t vlan_psz __read_mostly; 228 static struct psref_class *ifvm_psref_class __read_mostly; 229 230 struct if_clone vlan_cloner = 231 IF_CLONE_INITIALIZER("vlan", vlan_clone_create, vlan_clone_destroy); 232 233 /* Used to pad ethernet frames with < ETHER_MIN_LEN bytes */ 234 static char vlan_zero_pad_buff[ETHER_MIN_LEN]; 235 236 static inline int 237 vlan_safe_ifpromisc(struct ifnet *ifp, int pswitch) 238 { 239 int e; 240 241 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 242 e = ifpromisc(ifp, pswitch); 243 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 244 245 return e; 246 } 247 248 static inline int 249 vlan_safe_ifpromisc_locked(struct ifnet *ifp, int pswitch) 250 { 251 int e; 252 253 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 254 e = ifpromisc_locked(ifp, pswitch); 255 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 256 257 return e; 258 } 259 260 void 261 vlanattach(int n) 262 { 263 264 /* 265 * Nothing to do here, initialization is handled by the 266 * module initialization code in vlaninit() below. 267 */ 268 } 269 270 static void 271 vlaninit(void) 272 { 273 mutex_init(&ifv_list.lock, MUTEX_DEFAULT, IPL_NONE); 274 LIST_INIT(&ifv_list.list); 275 276 mutex_init(&ifv_hash.lock, MUTEX_DEFAULT, IPL_NONE); 277 vlan_psz = pserialize_create(); 278 ifvm_psref_class = psref_class_create("vlanlinkmib", IPL_SOFTNET); 279 if_clone_attach(&vlan_cloner); 280 281 vlan_hash_init(); 282 MODULE_HOOK_SET(if_vlan_vlan_input_hook, "vlan_inp", vlan_input); 283 } 284 285 static int 286 vlandetach(void) 287 { 288 bool is_empty; 289 int error; 290 291 mutex_enter(&ifv_list.lock); 292 is_empty = LIST_EMPTY(&ifv_list.list); 293 mutex_exit(&ifv_list.lock); 294 295 if (!is_empty) 296 return EBUSY; 297 298 error = vlan_hash_fini(); 299 if (error != 0) 300 return error; 301 302 if_clone_detach(&vlan_cloner); 303 psref_class_destroy(ifvm_psref_class); 304 pserialize_destroy(vlan_psz); 305 mutex_destroy(&ifv_hash.lock); 306 mutex_destroy(&ifv_list.lock); 307 308 MODULE_HOOK_UNSET(if_vlan_vlan_input_hook); 309 return 0; 310 } 311 312 static void 313 vlan_reset_linkname(struct ifnet *ifp) 314 { 315 316 /* 317 * We start out with a "802.1Q VLAN" type and zero-length 318 * addresses. When we attach to a parent interface, we 319 * inherit its type, address length, address, and data link 320 * type. 321 */ 322 323 ifp->if_type = IFT_L2VLAN; 324 ifp->if_addrlen = 0; 325 ifp->if_dlt = DLT_NULL; 326 if_alloc_sadl(ifp); 327 } 328 329 static int 330 vlan_clone_create(struct if_clone *ifc, int unit) 331 { 332 struct ifvlan *ifv; 333 struct ifnet *ifp; 334 struct ifvlan_linkmib *mib; 335 int rv; 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 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 358 #ifdef NET_MPSAFE 359 ifp->if_extflags |= IFEF_MPSAFE; 360 #endif 361 ifp->if_start = vlan_start; 362 ifp->if_transmit = vlan_transmit; 363 ifp->if_ioctl = vlan_ioctl; 364 IFQ_SET_READY(&ifp->if_snd); 365 366 rv = if_initialize(ifp); 367 if (rv != 0) { 368 aprint_error("%s: if_initialize failed(%d)\n", ifp->if_xname, 369 rv); 370 goto fail; 371 } 372 373 vlan_reset_linkname(ifp); 374 if_register(ifp); 375 return 0; 376 377 fail: 378 mutex_enter(&ifv_list.lock); 379 LIST_REMOVE(ifv, ifv_list); 380 mutex_exit(&ifv_list.lock); 381 382 mutex_destroy(&ifv->ifv_lock); 383 psref_target_destroy(&ifv->ifv_mib->ifvm_psref, ifvm_psref_class); 384 kmem_free(ifv->ifv_mib, sizeof(struct ifvlan_linkmib)); 385 free(ifv, M_DEVBUF); 386 387 return rv; 388 } 389 390 static int 391 vlan_clone_destroy(struct ifnet *ifp) 392 { 393 struct ifvlan *ifv = ifp->if_softc; 394 395 mutex_enter(&ifv_list.lock); 396 LIST_REMOVE(ifv, ifv_list); 397 mutex_exit(&ifv_list.lock); 398 399 IFNET_LOCK(ifp); 400 vlan_unconfig(ifp); 401 IFNET_UNLOCK(ifp); 402 if_detach(ifp); 403 404 psref_target_destroy(&ifv->ifv_mib->ifvm_psref, ifvm_psref_class); 405 kmem_free(ifv->ifv_mib, sizeof(struct ifvlan_linkmib)); 406 pserialize_destroy(ifv->ifv_psz); 407 mutex_destroy(&ifv->ifv_lock); 408 free(ifv, M_DEVBUF); 409 410 return 0; 411 } 412 413 /* 414 * Configure a VLAN interface. 415 */ 416 static int 417 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 418 { 419 struct ifnet *ifp = &ifv->ifv_if; 420 struct ifvlan_linkmib *nmib = NULL; 421 struct ifvlan_linkmib *omib = NULL; 422 struct ifvlan_linkmib *checkmib; 423 struct psref_target *nmib_psref = NULL; 424 const uint16_t vid = EVL_VLANOFTAG(tag); 425 int error = 0; 426 int idx; 427 bool omib_cleanup = false; 428 struct psref psref; 429 430 /* VLAN ID 0 and 4095 are reserved in the spec */ 431 if ((vid == 0) || (vid == 0xfff)) 432 return EINVAL; 433 434 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 435 mutex_enter(&ifv->ifv_lock); 436 omib = ifv->ifv_mib; 437 438 if (omib->ifvm_p != NULL) { 439 error = EBUSY; 440 goto done; 441 } 442 443 /* Duplicate check */ 444 checkmib = vlan_lookup_tag_psref(p, vid, &psref); 445 if (checkmib != NULL) { 446 vlan_putref_linkmib(checkmib, &psref); 447 error = EEXIST; 448 goto done; 449 } 450 451 *nmib = *omib; 452 nmib_psref = &nmib->ifvm_psref; 453 454 psref_target_init(nmib_psref, ifvm_psref_class); 455 456 switch (p->if_type) { 457 case IFT_ETHER: 458 { 459 struct ethercom *ec = (void *)p; 460 struct vlanid_list *vidmem; 461 462 nmib->ifvm_msw = &vlan_ether_multisw; 463 nmib->ifvm_encaplen = ETHER_VLAN_ENCAP_LEN; 464 nmib->ifvm_mintu = ETHERMIN; 465 466 if (ec->ec_nvlans++ == 0) { 467 IFNET_LOCK(p); 468 error = ether_enable_vlan_mtu(p); 469 IFNET_UNLOCK(p); 470 if (error >= 0) { 471 if (error) { 472 ec->ec_nvlans--; 473 goto done; 474 } 475 nmib->ifvm_mtufudge = 0; 476 } else { 477 /* 478 * Fudge the MTU by the encapsulation size. This 479 * makes us incompatible with strictly compliant 480 * 802.1Q implementations, but allows us to use 481 * the feature with other NetBSD 482 * implementations, which might still be useful. 483 */ 484 nmib->ifvm_mtufudge = nmib->ifvm_encaplen; 485 } 486 error = 0; 487 } 488 /* Add a vid to the list */ 489 vidmem = kmem_alloc(sizeof(struct vlanid_list), KM_SLEEP); 490 vidmem->vid = vid; 491 ETHER_LOCK(ec); 492 SIMPLEQ_INSERT_TAIL(&ec->ec_vids, vidmem, vid_list); 493 ETHER_UNLOCK(ec); 494 495 if (ec->ec_vlan_cb != NULL) { 496 /* 497 * Call ec_vlan_cb(). It will setup VLAN HW filter or 498 * HW tagging function. 499 */ 500 error = (*ec->ec_vlan_cb)(ec, vid, true); 501 if (error) { 502 ec->ec_nvlans--; 503 if (ec->ec_nvlans == 0) { 504 IFNET_LOCK(p); 505 (void)ether_disable_vlan_mtu(p); 506 IFNET_UNLOCK(p); 507 } 508 goto done; 509 } 510 } 511 /* 512 * If the parent interface can do hardware-assisted 513 * VLAN encapsulation, then propagate its hardware- 514 * assisted checksumming flags and tcp segmentation 515 * offload. 516 */ 517 if (ec->ec_capabilities & ETHERCAP_VLAN_HWTAGGING) { 518 ifp->if_capabilities = p->if_capabilities & 519 (IFCAP_TSOv4 | IFCAP_TSOv6 | 520 IFCAP_CSUM_IPv4_Tx | IFCAP_CSUM_IPv4_Rx | 521 IFCAP_CSUM_TCPv4_Tx | IFCAP_CSUM_TCPv4_Rx | 522 IFCAP_CSUM_UDPv4_Tx | IFCAP_CSUM_UDPv4_Rx | 523 IFCAP_CSUM_TCPv6_Tx | IFCAP_CSUM_TCPv6_Rx | 524 IFCAP_CSUM_UDPv6_Tx | IFCAP_CSUM_UDPv6_Rx); 525 } 526 527 /* 528 * We inherit the parent's Ethernet address. 529 */ 530 ether_ifattach(ifp, CLLADDR(p->if_sadl)); 531 ifp->if_hdrlen = sizeof(struct ether_vlan_header); /* XXX? */ 532 break; 533 } 534 535 default: 536 error = EPROTONOSUPPORT; 537 goto done; 538 } 539 540 nmib->ifvm_p = p; 541 nmib->ifvm_tag = vid; 542 ifv->ifv_if.if_mtu = p->if_mtu - nmib->ifvm_mtufudge; 543 ifv->ifv_if.if_flags = p->if_flags & 544 (IFF_UP | IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST); 545 546 /* 547 * Inherit the if_type from the parent. This allows us 548 * to participate in bridges of that type. 549 */ 550 ifv->ifv_if.if_type = p->if_type; 551 552 PSLIST_ENTRY_INIT(ifv, ifv_hash); 553 idx = vlan_tag_hash(vid, ifv_hash.mask); 554 555 mutex_enter(&ifv_hash.lock); 556 PSLIST_WRITER_INSERT_HEAD(&ifv_hash.lists[idx], ifv, ifv_hash); 557 mutex_exit(&ifv_hash.lock); 558 559 vlan_linkmib_update(ifv, nmib); 560 nmib = NULL; 561 nmib_psref = NULL; 562 omib_cleanup = true; 563 564 done: 565 mutex_exit(&ifv->ifv_lock); 566 567 if (nmib_psref) 568 psref_target_destroy(nmib_psref, ifvm_psref_class); 569 if (nmib) 570 kmem_free(nmib, sizeof(*nmib)); 571 if (omib_cleanup) 572 kmem_free(omib, sizeof(*omib)); 573 574 return error; 575 } 576 577 /* 578 * Unconfigure a VLAN interface. 579 */ 580 static void 581 vlan_unconfig(struct ifnet *ifp) 582 { 583 struct ifvlan *ifv = ifp->if_softc; 584 struct ifvlan_linkmib *nmib = NULL; 585 int error; 586 587 KASSERT(IFNET_LOCKED(ifp)); 588 589 nmib = kmem_alloc(sizeof(*nmib), KM_SLEEP); 590 591 mutex_enter(&ifv->ifv_lock); 592 error = vlan_unconfig_locked(ifv, nmib); 593 mutex_exit(&ifv->ifv_lock); 594 595 if (error) 596 kmem_free(nmib, sizeof(*nmib)); 597 } 598 static int 599 vlan_unconfig_locked(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 600 { 601 struct ifnet *p; 602 struct ifnet *ifp = &ifv->ifv_if; 603 struct psref_target *nmib_psref = NULL; 604 struct ifvlan_linkmib *omib; 605 int error = 0; 606 607 KASSERT(IFNET_LOCKED(ifp)); 608 KASSERT(mutex_owned(&ifv->ifv_lock)); 609 610 ifp->if_flags &= ~(IFF_UP | IFF_RUNNING); 611 612 omib = ifv->ifv_mib; 613 p = omib->ifvm_p; 614 615 if (p == NULL) { 616 error = -1; 617 goto done; 618 } 619 620 *nmib = *omib; 621 nmib_psref = &nmib->ifvm_psref; 622 psref_target_init(nmib_psref, ifvm_psref_class); 623 624 /* 625 * Since the interface is being unconfigured, we need to empty the 626 * list of multicast groups that we may have joined while we were 627 * alive and remove them from the parent's list also. 628 */ 629 (*nmib->ifvm_msw->vmsw_purgemulti)(ifv); 630 631 /* Disconnect from parent. */ 632 switch (p->if_type) { 633 case IFT_ETHER: 634 { 635 struct ethercom *ec = (void *)p; 636 struct vlanid_list *vlanidp; 637 uint16_t vid = EVL_VLANOFTAG(nmib->ifvm_tag); 638 639 ETHER_LOCK(ec); 640 SIMPLEQ_FOREACH(vlanidp, &ec->ec_vids, vid_list) { 641 if (vlanidp->vid == vid) { 642 SIMPLEQ_REMOVE(&ec->ec_vids, vlanidp, 643 vlanid_list, vid_list); 644 break; 645 } 646 } 647 ETHER_UNLOCK(ec); 648 if (vlanidp != NULL) 649 kmem_free(vlanidp, sizeof(*vlanidp)); 650 651 if (ec->ec_vlan_cb != NULL) { 652 /* 653 * Call ec_vlan_cb(). It will setup VLAN HW filter or 654 * HW tagging function. 655 */ 656 (void)(*ec->ec_vlan_cb)(ec, vid, false); 657 } 658 if (--ec->ec_nvlans == 0) { 659 IFNET_LOCK(p); 660 (void)ether_disable_vlan_mtu(p); 661 IFNET_UNLOCK(p); 662 } 663 664 /* XXX ether_ifdetach must not be called with IFNET_LOCK */ 665 mutex_exit(&ifv->ifv_lock); 666 IFNET_UNLOCK(ifp); 667 ether_ifdetach(ifp); 668 IFNET_LOCK(ifp); 669 mutex_enter(&ifv->ifv_lock); 670 671 /* if_free_sadl must be called with IFNET_LOCK */ 672 if_free_sadl(ifp, 1); 673 674 /* Restore vlan_ioctl overwritten by ether_ifdetach */ 675 ifp->if_ioctl = vlan_ioctl; 676 vlan_reset_linkname(ifp); 677 break; 678 } 679 680 default: 681 panic("%s: impossible", __func__); 682 } 683 684 nmib->ifvm_p = NULL; 685 ifv->ifv_if.if_mtu = 0; 686 ifv->ifv_flags = 0; 687 688 mutex_enter(&ifv_hash.lock); 689 PSLIST_WRITER_REMOVE(ifv, ifv_hash); 690 pserialize_perform(vlan_psz); 691 mutex_exit(&ifv_hash.lock); 692 PSLIST_ENTRY_DESTROY(ifv, ifv_hash); 693 694 vlan_linkmib_update(ifv, nmib); 695 696 mutex_exit(&ifv->ifv_lock); 697 698 nmib_psref = NULL; 699 kmem_free(omib, sizeof(*omib)); 700 701 #ifdef INET6 702 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 703 /* To delete v6 link local addresses */ 704 if (in6_present) 705 in6_ifdetach(ifp); 706 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 707 #endif 708 709 if ((ifp->if_flags & IFF_PROMISC) != 0) 710 vlan_safe_ifpromisc_locked(ifp, 0); 711 if_down_locked(ifp); 712 ifp->if_capabilities = 0; 713 mutex_enter(&ifv->ifv_lock); 714 done: 715 716 if (nmib_psref) 717 psref_target_destroy(nmib_psref, ifvm_psref_class); 718 719 return error; 720 } 721 722 static void 723 vlan_hash_init(void) 724 { 725 726 ifv_hash.lists = hashinit(VLAN_TAG_HASH_SIZE, HASH_PSLIST, true, 727 &ifv_hash.mask); 728 } 729 730 static int 731 vlan_hash_fini(void) 732 { 733 int i; 734 735 mutex_enter(&ifv_hash.lock); 736 737 for (i = 0; i < ifv_hash.mask + 1; i++) { 738 if (PSLIST_WRITER_FIRST(&ifv_hash.lists[i], struct ifvlan, 739 ifv_hash) != NULL) { 740 mutex_exit(&ifv_hash.lock); 741 return EBUSY; 742 } 743 } 744 745 for (i = 0; i < ifv_hash.mask + 1; i++) 746 PSLIST_DESTROY(&ifv_hash.lists[i]); 747 748 mutex_exit(&ifv_hash.lock); 749 750 hashdone(ifv_hash.lists, HASH_PSLIST, ifv_hash.mask); 751 752 ifv_hash.lists = NULL; 753 ifv_hash.mask = 0; 754 755 return 0; 756 } 757 758 static int 759 vlan_tag_hash(uint16_t tag, u_long mask) 760 { 761 uint32_t hash; 762 763 hash = (tag >> 8) ^ tag; 764 hash = (hash >> 2) ^ hash; 765 766 return hash & mask; 767 } 768 769 static struct ifvlan_linkmib * 770 vlan_getref_linkmib(struct ifvlan *sc, struct psref *psref) 771 { 772 struct ifvlan_linkmib *mib; 773 int s; 774 775 s = pserialize_read_enter(); 776 mib = sc->ifv_mib; 777 if (mib == NULL) { 778 pserialize_read_exit(s); 779 return NULL; 780 } 781 membar_datadep_consumer(); 782 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 783 pserialize_read_exit(s); 784 785 return mib; 786 } 787 788 static void 789 vlan_putref_linkmib(struct ifvlan_linkmib *mib, struct psref *psref) 790 { 791 if (mib == NULL) 792 return; 793 psref_release(psref, &mib->ifvm_psref, ifvm_psref_class); 794 } 795 796 static struct ifvlan_linkmib * 797 vlan_lookup_tag_psref(struct ifnet *ifp, uint16_t tag, struct psref *psref) 798 { 799 int idx; 800 int s; 801 struct ifvlan *sc; 802 803 idx = vlan_tag_hash(tag, ifv_hash.mask); 804 805 s = pserialize_read_enter(); 806 PSLIST_READER_FOREACH(sc, &ifv_hash.lists[idx], struct ifvlan, 807 ifv_hash) { 808 struct ifvlan_linkmib *mib = sc->ifv_mib; 809 if (mib == NULL) 810 continue; 811 if (mib->ifvm_tag != tag) 812 continue; 813 if (mib->ifvm_p != ifp) 814 continue; 815 816 psref_acquire(psref, &mib->ifvm_psref, ifvm_psref_class); 817 pserialize_read_exit(s); 818 return mib; 819 } 820 pserialize_read_exit(s); 821 return NULL; 822 } 823 824 static void 825 vlan_linkmib_update(struct ifvlan *ifv, struct ifvlan_linkmib *nmib) 826 { 827 struct ifvlan_linkmib *omib = ifv->ifv_mib; 828 829 KASSERT(mutex_owned(&ifv->ifv_lock)); 830 831 membar_producer(); 832 ifv->ifv_mib = nmib; 833 834 pserialize_perform(ifv->ifv_psz); 835 psref_target_destroy(&omib->ifvm_psref, ifvm_psref_class); 836 } 837 838 /* 839 * Called when a parent interface is detaching; destroy any VLAN 840 * configuration for the parent interface. 841 */ 842 void 843 vlan_ifdetach(struct ifnet *p) 844 { 845 struct ifvlan *ifv; 846 struct ifvlan_linkmib *mib, **nmibs; 847 struct psref psref; 848 int error; 849 int bound; 850 int i, cnt = 0; 851 852 bound = curlwp_bind(); 853 854 mutex_enter(&ifv_list.lock); 855 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 856 mib = vlan_getref_linkmib(ifv, &psref); 857 if (mib == NULL) 858 continue; 859 860 if (mib->ifvm_p == p) 861 cnt++; 862 863 vlan_putref_linkmib(mib, &psref); 864 } 865 mutex_exit(&ifv_list.lock); 866 867 if (cnt == 0) { 868 curlwp_bindx(bound); 869 return; 870 } 871 872 /* 873 * The value of "cnt" does not increase while ifv_list.lock 874 * and ifv->ifv_lock are released here, because the parent 875 * interface is detaching. 876 */ 877 nmibs = kmem_alloc(sizeof(*nmibs) * cnt, KM_SLEEP); 878 for (i = 0; i < cnt; i++) { 879 nmibs[i] = kmem_alloc(sizeof(*nmibs[i]), KM_SLEEP); 880 } 881 882 mutex_enter(&ifv_list.lock); 883 884 i = 0; 885 LIST_FOREACH(ifv, &ifv_list.list, ifv_list) { 886 struct ifnet *ifp = &ifv->ifv_if; 887 888 /* IFNET_LOCK must be held before ifv_lock. */ 889 IFNET_LOCK(ifp); 890 mutex_enter(&ifv->ifv_lock); 891 892 /* XXX ifv_mib = NULL? */ 893 if (ifv->ifv_mib->ifvm_p == p) { 894 KASSERTMSG(i < cnt, 895 "no memory for unconfig, parent=%s", p->if_xname); 896 error = vlan_unconfig_locked(ifv, nmibs[i]); 897 if (!error) { 898 nmibs[i] = NULL; 899 i++; 900 } 901 902 } 903 904 mutex_exit(&ifv->ifv_lock); 905 IFNET_UNLOCK(ifp); 906 } 907 908 mutex_exit(&ifv_list.lock); 909 910 curlwp_bindx(bound); 911 912 for (i = 0; i < cnt; i++) { 913 if (nmibs[i]) 914 kmem_free(nmibs[i], sizeof(*nmibs[i])); 915 } 916 917 kmem_free(nmibs, sizeof(*nmibs) * cnt); 918 919 return; 920 } 921 922 static int 923 vlan_set_promisc(struct ifnet *ifp) 924 { 925 struct ifvlan *ifv = ifp->if_softc; 926 struct ifvlan_linkmib *mib; 927 struct psref psref; 928 int error = 0; 929 int bound; 930 931 bound = curlwp_bind(); 932 mib = vlan_getref_linkmib(ifv, &psref); 933 if (mib == NULL) { 934 curlwp_bindx(bound); 935 return EBUSY; 936 } 937 938 if ((ifp->if_flags & IFF_PROMISC) != 0) { 939 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) { 940 error = vlan_safe_ifpromisc(mib->ifvm_p, 1); 941 if (error == 0) 942 ifv->ifv_flags |= IFVF_PROMISC; 943 } 944 } else { 945 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) { 946 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 947 if (error == 0) 948 ifv->ifv_flags &= ~IFVF_PROMISC; 949 } 950 } 951 vlan_putref_linkmib(mib, &psref); 952 curlwp_bindx(bound); 953 954 return error; 955 } 956 957 static int 958 vlan_ioctl(struct ifnet *ifp, u_long cmd, void *data) 959 { 960 struct lwp *l = curlwp; 961 struct ifvlan *ifv = ifp->if_softc; 962 struct ifaddr *ifa = (struct ifaddr *) data; 963 struct ifreq *ifr = (struct ifreq *) data; 964 struct ifnet *pr; 965 struct ifcapreq *ifcr; 966 struct vlanreq vlr; 967 struct ifvlan_linkmib *mib; 968 struct psref psref; 969 int error = 0; 970 int bound; 971 972 switch (cmd) { 973 case SIOCSIFMTU: 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 vlan_putref_linkmib(mib, &psref); 984 curlwp_bindx(bound); 985 error = EINVAL; 986 } else if ( 987 ifr->ifr_mtu > (mib->ifvm_p->if_mtu - mib->ifvm_mtufudge) || 988 ifr->ifr_mtu < (mib->ifvm_mintu - mib->ifvm_mtufudge)) { 989 vlan_putref_linkmib(mib, &psref); 990 curlwp_bindx(bound); 991 error = EINVAL; 992 } else { 993 vlan_putref_linkmib(mib, &psref); 994 curlwp_bindx(bound); 995 996 error = ifioctl_common(ifp, cmd, data); 997 if (error == ENETRESET) 998 error = 0; 999 } 1000 1001 break; 1002 1003 case SIOCSETVLAN: 1004 if ((error = kauth_authorize_network(l->l_cred, 1005 KAUTH_NETWORK_INTERFACE, 1006 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1007 NULL)) != 0) 1008 break; 1009 if ((error = copyin(ifr->ifr_data, &vlr, sizeof(vlr))) != 0) 1010 break; 1011 1012 if (vlr.vlr_parent[0] == '\0') { 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 1021 if (mib->ifvm_p != NULL && 1022 (ifp->if_flags & IFF_PROMISC) != 0) 1023 error = vlan_safe_ifpromisc(mib->ifvm_p, 0); 1024 1025 vlan_putref_linkmib(mib, &psref); 1026 curlwp_bindx(bound); 1027 1028 vlan_unconfig(ifp); 1029 break; 1030 } 1031 if (vlr.vlr_tag != EVL_VLANOFTAG(vlr.vlr_tag)) { 1032 error = EINVAL; /* check for valid tag */ 1033 break; 1034 } 1035 if ((pr = ifunit(vlr.vlr_parent)) == NULL) { 1036 error = ENOENT; 1037 break; 1038 } 1039 1040 error = vlan_config(ifv, pr, vlr.vlr_tag); 1041 if (error != 0) 1042 break; 1043 1044 /* Update promiscuous mode, if necessary. */ 1045 vlan_set_promisc(ifp); 1046 1047 ifp->if_flags |= IFF_RUNNING; 1048 break; 1049 1050 case SIOCGETVLAN: 1051 memset(&vlr, 0, sizeof(vlr)); 1052 bound = curlwp_bind(); 1053 mib = vlan_getref_linkmib(ifv, &psref); 1054 if (mib == NULL) { 1055 curlwp_bindx(bound); 1056 error = EBUSY; 1057 break; 1058 } 1059 if (mib->ifvm_p != NULL) { 1060 snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent), "%s", 1061 mib->ifvm_p->if_xname); 1062 vlr.vlr_tag = mib->ifvm_tag; 1063 } 1064 vlan_putref_linkmib(mib, &psref); 1065 curlwp_bindx(bound); 1066 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1067 break; 1068 1069 case SIOCSIFFLAGS: 1070 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1071 break; 1072 /* 1073 * For promiscuous mode, we enable promiscuous mode on 1074 * the parent if we need promiscuous on the VLAN interface. 1075 */ 1076 bound = curlwp_bind(); 1077 mib = vlan_getref_linkmib(ifv, &psref); 1078 if (mib == NULL) { 1079 curlwp_bindx(bound); 1080 error = EBUSY; 1081 break; 1082 } 1083 1084 if (mib->ifvm_p != NULL) 1085 error = vlan_set_promisc(ifp); 1086 vlan_putref_linkmib(mib, &psref); 1087 curlwp_bindx(bound); 1088 break; 1089 1090 case SIOCADDMULTI: 1091 mutex_enter(&ifv->ifv_lock); 1092 mib = ifv->ifv_mib; 1093 if (mib == NULL) { 1094 error = EBUSY; 1095 mutex_exit(&ifv->ifv_lock); 1096 break; 1097 } 1098 1099 error = (mib->ifvm_p != NULL) ? 1100 (*mib->ifvm_msw->vmsw_addmulti)(ifv, ifr) : EINVAL; 1101 mib = NULL; 1102 mutex_exit(&ifv->ifv_lock); 1103 break; 1104 1105 case SIOCDELMULTI: 1106 mutex_enter(&ifv->ifv_lock); 1107 mib = ifv->ifv_mib; 1108 if (mib == NULL) { 1109 error = EBUSY; 1110 mutex_exit(&ifv->ifv_lock); 1111 break; 1112 } 1113 error = (mib->ifvm_p != NULL) ? 1114 (*mib->ifvm_msw->vmsw_delmulti)(ifv, ifr) : EINVAL; 1115 mib = NULL; 1116 mutex_exit(&ifv->ifv_lock); 1117 break; 1118 1119 case SIOCSIFCAP: 1120 ifcr = data; 1121 /* make sure caps are enabled on parent */ 1122 bound = curlwp_bind(); 1123 mib = vlan_getref_linkmib(ifv, &psref); 1124 if (mib == NULL) { 1125 curlwp_bindx(bound); 1126 error = EBUSY; 1127 break; 1128 } 1129 1130 if (mib->ifvm_p == NULL) { 1131 vlan_putref_linkmib(mib, &psref); 1132 curlwp_bindx(bound); 1133 error = EINVAL; 1134 break; 1135 } 1136 if ((mib->ifvm_p->if_capenable & ifcr->ifcr_capenable) != 1137 ifcr->ifcr_capenable) { 1138 vlan_putref_linkmib(mib, &psref); 1139 curlwp_bindx(bound); 1140 error = EINVAL; 1141 break; 1142 } 1143 1144 vlan_putref_linkmib(mib, &psref); 1145 curlwp_bindx(bound); 1146 1147 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1148 error = 0; 1149 break; 1150 case SIOCINITIFADDR: 1151 bound = curlwp_bind(); 1152 mib = vlan_getref_linkmib(ifv, &psref); 1153 if (mib == NULL) { 1154 curlwp_bindx(bound); 1155 error = EBUSY; 1156 break; 1157 } 1158 1159 if (mib->ifvm_p == NULL) { 1160 error = EINVAL; 1161 vlan_putref_linkmib(mib, &psref); 1162 curlwp_bindx(bound); 1163 break; 1164 } 1165 vlan_putref_linkmib(mib, &psref); 1166 curlwp_bindx(bound); 1167 1168 ifp->if_flags |= IFF_UP; 1169 #ifdef INET 1170 if (ifa->ifa_addr->sa_family == AF_INET) 1171 arp_ifinit(ifp, ifa); 1172 #endif 1173 break; 1174 1175 default: 1176 error = ether_ioctl(ifp, cmd, data); 1177 } 1178 1179 return error; 1180 } 1181 1182 static int 1183 vlan_ether_addmulti(struct ifvlan *ifv, struct ifreq *ifr) 1184 { 1185 const struct sockaddr *sa = ifreq_getaddr(SIOCADDMULTI, ifr); 1186 struct vlan_mc_entry *mc; 1187 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1188 struct ifvlan_linkmib *mib; 1189 int error; 1190 1191 KASSERT(mutex_owned(&ifv->ifv_lock)); 1192 1193 if (sa->sa_len > sizeof(struct sockaddr_storage)) 1194 return EINVAL; 1195 1196 error = ether_addmulti(sa, &ifv->ifv_ec); 1197 if (error != ENETRESET) 1198 return error; 1199 1200 /* 1201 * This is a new multicast address. We have to tell parent 1202 * about it. Also, remember this multicast address so that 1203 * we can delete it on unconfigure. 1204 */ 1205 mc = malloc(sizeof(struct vlan_mc_entry), M_DEVBUF, M_NOWAIT); 1206 if (mc == NULL) { 1207 error = ENOMEM; 1208 goto alloc_failed; 1209 } 1210 1211 /* 1212 * Since ether_addmulti() returned ENETRESET, the following two 1213 * statements shouldn't fail. Here ifv_ec is implicitly protected 1214 * by the ifv_lock lock. 1215 */ 1216 error = ether_multiaddr(sa, addrlo, addrhi); 1217 KASSERT(error == 0); 1218 1219 ETHER_LOCK(&ifv->ifv_ec); 1220 mc->mc_enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1221 ETHER_UNLOCK(&ifv->ifv_ec); 1222 1223 KASSERT(mc->mc_enm != NULL); 1224 1225 memcpy(&mc->mc_addr, sa, sa->sa_len); 1226 LIST_INSERT_HEAD(&ifv->ifv_mc_listhead, mc, mc_entries); 1227 1228 mib = ifv->ifv_mib; 1229 1230 KERNEL_LOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1231 error = if_mcast_op(mib->ifvm_p, SIOCADDMULTI, sa); 1232 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(mib->ifvm_p); 1233 1234 if (error != 0) 1235 goto ioctl_failed; 1236 return error; 1237 1238 ioctl_failed: 1239 LIST_REMOVE(mc, mc_entries); 1240 free(mc, M_DEVBUF); 1241 1242 alloc_failed: 1243 (void)ether_delmulti(sa, &ifv->ifv_ec); 1244 return error; 1245 } 1246 1247 static int 1248 vlan_ether_delmulti(struct ifvlan *ifv, struct ifreq *ifr) 1249 { 1250 const struct sockaddr *sa = ifreq_getaddr(SIOCDELMULTI, ifr); 1251 struct ether_multi *enm; 1252 struct vlan_mc_entry *mc; 1253 struct ifvlan_linkmib *mib; 1254 uint8_t addrlo[ETHER_ADDR_LEN], addrhi[ETHER_ADDR_LEN]; 1255 int error; 1256 1257 KASSERT(mutex_owned(&ifv->ifv_lock)); 1258 1259 /* 1260 * Find a key to lookup vlan_mc_entry. We have to do this 1261 * before calling ether_delmulti for obvious reasons. 1262 */ 1263 if ((error = ether_multiaddr(sa, addrlo, addrhi)) != 0) 1264 return error; 1265 1266 ETHER_LOCK(&ifv->ifv_ec); 1267 enm = ether_lookup_multi(addrlo, addrhi, &ifv->ifv_ec); 1268 ETHER_UNLOCK(&ifv->ifv_ec); 1269 if (enm == NULL) 1270 return EINVAL; 1271 1272 LIST_FOREACH(mc, &ifv->ifv_mc_listhead, mc_entries) { 1273 if (mc->mc_enm == enm) 1274 break; 1275 } 1276 1277 /* We woun't delete entries we didn't add */ 1278 if (mc == NULL) 1279 return EINVAL; 1280 1281 error = ether_delmulti(sa, &ifv->ifv_ec); 1282 if (error != ENETRESET) 1283 return error; 1284 1285 /* We no longer use this multicast address. Tell parent so. */ 1286 mib = ifv->ifv_mib; 1287 error = if_mcast_op(mib->ifvm_p, SIOCDELMULTI, sa); 1288 1289 if (error == 0) { 1290 /* And forget about this address. */ 1291 LIST_REMOVE(mc, mc_entries); 1292 free(mc, M_DEVBUF); 1293 } else { 1294 (void)ether_addmulti(sa, &ifv->ifv_ec); 1295 } 1296 1297 return error; 1298 } 1299 1300 /* 1301 * Delete any multicast address we have asked to add from parent 1302 * interface. Called when the vlan is being unconfigured. 1303 */ 1304 static void 1305 vlan_ether_purgemulti(struct ifvlan *ifv) 1306 { 1307 struct vlan_mc_entry *mc; 1308 struct ifvlan_linkmib *mib; 1309 1310 KASSERT(mutex_owned(&ifv->ifv_lock)); 1311 mib = ifv->ifv_mib; 1312 if (mib == NULL) { 1313 return; 1314 } 1315 1316 while ((mc = LIST_FIRST(&ifv->ifv_mc_listhead)) != NULL) { 1317 (void)if_mcast_op(mib->ifvm_p, SIOCDELMULTI, 1318 sstocsa(&mc->mc_addr)); 1319 LIST_REMOVE(mc, mc_entries); 1320 free(mc, M_DEVBUF); 1321 } 1322 } 1323 1324 static void 1325 vlan_start(struct ifnet *ifp) 1326 { 1327 struct ifvlan *ifv = ifp->if_softc; 1328 struct ifnet *p; 1329 struct ethercom *ec; 1330 struct mbuf *m; 1331 struct ifvlan_linkmib *mib; 1332 struct psref psref; 1333 int error; 1334 1335 mib = vlan_getref_linkmib(ifv, &psref); 1336 if (mib == NULL) 1337 return; 1338 p = mib->ifvm_p; 1339 ec = (void *)mib->ifvm_p; 1340 1341 ifp->if_flags |= IFF_OACTIVE; 1342 1343 for (;;) { 1344 IFQ_DEQUEUE(&ifp->if_snd, m); 1345 if (m == NULL) 1346 break; 1347 1348 #ifdef ALTQ 1349 /* 1350 * KERNEL_LOCK is required for ALTQ even if NET_MPSAFE is 1351 * defined. 1352 */ 1353 KERNEL_LOCK(1, NULL); 1354 /* 1355 * If ALTQ is enabled on the parent interface, do 1356 * classification; the queueing discipline might 1357 * not require classification, but might require 1358 * the address family/header pointer in the pktattr. 1359 */ 1360 if (ALTQ_IS_ENABLED(&p->if_snd)) { 1361 switch (p->if_type) { 1362 case IFT_ETHER: 1363 altq_etherclassify(&p->if_snd, m); 1364 break; 1365 default: 1366 panic("%s: impossible (altq)", __func__); 1367 } 1368 } 1369 KERNEL_UNLOCK_ONE(NULL); 1370 #endif /* ALTQ */ 1371 1372 bpf_mtap(ifp, m, BPF_D_OUT); 1373 /* 1374 * If the parent can insert the tag itself, just mark 1375 * the tag in the mbuf header. 1376 */ 1377 if (ec->ec_capenable & ETHERCAP_VLAN_HWTAGGING) { 1378 vlan_set_tag(m, mib->ifvm_tag); 1379 } else { 1380 /* 1381 * insert the tag ourselves 1382 */ 1383 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1384 if (m == NULL) { 1385 printf("%s: unable to prepend encap header", 1386 p->if_xname); 1387 ifp->if_oerrors++; 1388 continue; 1389 } 1390 1391 switch (p->if_type) { 1392 case IFT_ETHER: 1393 { 1394 struct ether_vlan_header *evl; 1395 1396 if (m->m_len < sizeof(struct ether_vlan_header)) 1397 m = m_pullup(m, 1398 sizeof(struct ether_vlan_header)); 1399 if (m == NULL) { 1400 printf("%s: unable to pullup encap " 1401 "header", p->if_xname); 1402 ifp->if_oerrors++; 1403 continue; 1404 } 1405 1406 /* 1407 * Transform the Ethernet header into an 1408 * Ethernet header with 802.1Q encapsulation. 1409 */ 1410 memmove(mtod(m, void *), 1411 mtod(m, char *) + mib->ifvm_encaplen, 1412 sizeof(struct ether_header)); 1413 evl = mtod(m, struct ether_vlan_header *); 1414 evl->evl_proto = evl->evl_encap_proto; 1415 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1416 evl->evl_tag = htons(mib->ifvm_tag); 1417 1418 /* 1419 * To cater for VLAN-aware layer 2 ethernet 1420 * switches which may need to strip the tag 1421 * before forwarding the packet, make sure 1422 * the packet+tag is at least 68 bytes long. 1423 * This is necessary because our parent will 1424 * only pad to 64 bytes (ETHER_MIN_LEN) and 1425 * some switches will not pad by themselves 1426 * after deleting a tag. 1427 */ 1428 const size_t min_data_len = ETHER_MIN_LEN - 1429 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1430 if (m->m_pkthdr.len < min_data_len) { 1431 m_copyback(m, m->m_pkthdr.len, 1432 min_data_len - m->m_pkthdr.len, 1433 vlan_zero_pad_buff); 1434 } 1435 break; 1436 } 1437 1438 default: 1439 panic("%s: impossible", __func__); 1440 } 1441 } 1442 1443 if ((p->if_flags & IFF_RUNNING) == 0) { 1444 m_freem(m); 1445 continue; 1446 } 1447 1448 error = if_transmit_lock(p, m); 1449 if (error) { 1450 /* mbuf is already freed */ 1451 ifp->if_oerrors++; 1452 continue; 1453 } 1454 ifp->if_opackets++; 1455 } 1456 1457 ifp->if_flags &= ~IFF_OACTIVE; 1458 1459 /* Remove reference to mib before release */ 1460 vlan_putref_linkmib(mib, &psref); 1461 } 1462 1463 static int 1464 vlan_transmit(struct ifnet *ifp, struct mbuf *m) 1465 { 1466 struct ifvlan *ifv = ifp->if_softc; 1467 struct ifnet *p; 1468 struct ethercom *ec; 1469 struct ifvlan_linkmib *mib; 1470 struct psref psref; 1471 int error; 1472 size_t pktlen = m->m_pkthdr.len; 1473 bool mcast = (m->m_flags & M_MCAST) != 0; 1474 1475 mib = vlan_getref_linkmib(ifv, &psref); 1476 if (mib == NULL) { 1477 m_freem(m); 1478 return ENETDOWN; 1479 } 1480 1481 p = mib->ifvm_p; 1482 ec = (void *)mib->ifvm_p; 1483 1484 bpf_mtap(ifp, m, BPF_D_OUT); 1485 1486 if ((error = pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 1487 goto out; 1488 if (m == NULL) 1489 goto out; 1490 1491 /* 1492 * If the parent can insert the tag itself, just mark 1493 * the tag in the mbuf header. 1494 */ 1495 if (ec->ec_capenable & ETHERCAP_VLAN_HWTAGGING) { 1496 vlan_set_tag(m, mib->ifvm_tag); 1497 } else { 1498 /* 1499 * insert the tag ourselves 1500 */ 1501 M_PREPEND(m, mib->ifvm_encaplen, M_DONTWAIT); 1502 if (m == NULL) { 1503 printf("%s: unable to prepend encap header", 1504 p->if_xname); 1505 ifp->if_oerrors++; 1506 error = ENOBUFS; 1507 goto out; 1508 } 1509 1510 switch (p->if_type) { 1511 case IFT_ETHER: 1512 { 1513 struct ether_vlan_header *evl; 1514 1515 if (m->m_len < sizeof(struct ether_vlan_header)) 1516 m = m_pullup(m, 1517 sizeof(struct ether_vlan_header)); 1518 if (m == NULL) { 1519 printf("%s: unable to pullup encap " 1520 "header", p->if_xname); 1521 ifp->if_oerrors++; 1522 error = ENOBUFS; 1523 goto out; 1524 } 1525 1526 /* 1527 * Transform the Ethernet header into an 1528 * Ethernet header with 802.1Q encapsulation. 1529 */ 1530 memmove(mtod(m, void *), 1531 mtod(m, char *) + mib->ifvm_encaplen, 1532 sizeof(struct ether_header)); 1533 evl = mtod(m, struct ether_vlan_header *); 1534 evl->evl_proto = evl->evl_encap_proto; 1535 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 1536 evl->evl_tag = htons(mib->ifvm_tag); 1537 1538 /* 1539 * To cater for VLAN-aware layer 2 ethernet 1540 * switches which may need to strip the tag 1541 * before forwarding the packet, make sure 1542 * the packet+tag is at least 68 bytes long. 1543 * This is necessary because our parent will 1544 * only pad to 64 bytes (ETHER_MIN_LEN) and 1545 * some switches will not pad by themselves 1546 * after deleting a tag. 1547 */ 1548 const size_t min_data_len = ETHER_MIN_LEN - 1549 ETHER_CRC_LEN + ETHER_VLAN_ENCAP_LEN; 1550 if (m->m_pkthdr.len < min_data_len) { 1551 m_copyback(m, m->m_pkthdr.len, 1552 min_data_len - m->m_pkthdr.len, 1553 vlan_zero_pad_buff); 1554 } 1555 break; 1556 } 1557 1558 default: 1559 panic("%s: impossible", __func__); 1560 } 1561 } 1562 1563 if ((p->if_flags & IFF_RUNNING) == 0) { 1564 m_freem(m); 1565 error = ENETDOWN; 1566 goto out; 1567 } 1568 1569 error = if_transmit_lock(p, m); 1570 if (error) { 1571 /* mbuf is already freed */ 1572 ifp->if_oerrors++; 1573 } else { 1574 1575 ifp->if_opackets++; 1576 ifp->if_obytes += pktlen; 1577 if (mcast) 1578 ifp->if_omcasts++; 1579 } 1580 1581 out: 1582 /* Remove reference to mib before release */ 1583 vlan_putref_linkmib(mib, &psref); 1584 return error; 1585 } 1586 1587 /* 1588 * Given an Ethernet frame, find a valid vlan interface corresponding to the 1589 * given source interface and tag, then run the real packet through the 1590 * parent's input routine. 1591 */ 1592 void 1593 vlan_input(struct ifnet *ifp, struct mbuf *m) 1594 { 1595 struct ifvlan *ifv; 1596 uint16_t vid; 1597 struct ifvlan_linkmib *mib; 1598 struct psref psref; 1599 bool have_vtag; 1600 1601 have_vtag = vlan_has_tag(m); 1602 if (have_vtag) { 1603 vid = EVL_VLANOFTAG(vlan_get_tag(m)); 1604 m->m_flags &= ~M_VLANTAG; 1605 } else { 1606 struct ether_vlan_header *evl; 1607 1608 if (ifp->if_type != IFT_ETHER) { 1609 panic("%s: impossible", __func__); 1610 } 1611 1612 if (m->m_len < sizeof(struct ether_vlan_header) && 1613 (m = m_pullup(m, 1614 sizeof(struct ether_vlan_header))) == NULL) { 1615 printf("%s: no memory for VLAN header, " 1616 "dropping packet.\n", ifp->if_xname); 1617 return; 1618 } 1619 evl = mtod(m, struct ether_vlan_header *); 1620 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN); 1621 1622 vid = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1623 1624 /* 1625 * Restore the original ethertype. We'll remove 1626 * the encapsulation after we've found the vlan 1627 * interface corresponding to the tag. 1628 */ 1629 evl->evl_encap_proto = evl->evl_proto; 1630 } 1631 1632 mib = vlan_lookup_tag_psref(ifp, vid, &psref); 1633 if (mib == NULL) { 1634 m_freem(m); 1635 ifp->if_noproto++; 1636 return; 1637 } 1638 KASSERT(mib->ifvm_encaplen == ETHER_VLAN_ENCAP_LEN); 1639 1640 ifv = mib->ifvm_ifvlan; 1641 if ((ifv->ifv_if.if_flags & (IFF_UP | IFF_RUNNING)) != 1642 (IFF_UP | IFF_RUNNING)) { 1643 m_freem(m); 1644 ifp->if_noproto++; 1645 goto out; 1646 } 1647 1648 /* 1649 * Now, remove the encapsulation header. The original 1650 * header has already been fixed up above. 1651 */ 1652 if (!have_vtag) { 1653 memmove(mtod(m, char *) + mib->ifvm_encaplen, 1654 mtod(m, void *), sizeof(struct ether_header)); 1655 m_adj(m, mib->ifvm_encaplen); 1656 } 1657 1658 m_set_rcvif(m, &ifv->ifv_if); 1659 1660 if (pfil_run_hooks(ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 1661 goto out; 1662 if (m == NULL) 1663 goto out; 1664 1665 m->m_flags &= ~M_PROMISC; 1666 if_input(&ifv->ifv_if, m); 1667 out: 1668 vlan_putref_linkmib(mib, &psref); 1669 } 1670 1671 /* 1672 * Module infrastructure 1673 */ 1674 #include "if_module.h" 1675 1676 IF_MODULE(MODULE_CLASS_DRIVER, vlan, NULL) 1677
Indexes created Sun Oct 12 09:09:55 GMT 2025