1/*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD: stable/10/sys/net/if.c 333106 2018-04-30 08:39:23Z royger $ 31 */ 32 33#include "opt_compat.h" 34#include "opt_inet6.h" 35#include "opt_inet.h" 36 37#include <sys/param.h> 38#include <sys/types.h> 39#include <sys/conf.h> 40#include <sys/malloc.h> 41#include <sys/sbuf.h> 42#include <sys/bus.h> 43#include <sys/mbuf.h> 44#include <sys/systm.h> 45#include <sys/priv.h> 46#include <sys/proc.h> 47#include <sys/socket.h> 48#include <sys/socketvar.h> 49#include <sys/protosw.h> 50#include <sys/kernel.h> 51#include <sys/lock.h> 52#include <sys/refcount.h> 53#include <sys/module.h> 54#include <sys/rwlock.h> 55#include <sys/sockio.h> 56#include <sys/syslog.h> 57#include <sys/sysctl.h> 58#include <sys/taskqueue.h> 59#include <sys/domain.h> 60#include <sys/jail.h> 61#include <sys/priv.h> 62 63#include <machine/stdarg.h> 64#include <vm/uma.h> 65 66#include <net/if.h> 67#include <net/if_arp.h> 68#include <net/if_clone.h> 69#include <net/if_dl.h> 70#include <net/if_types.h> 71#include <net/if_var.h> 72#include <net/radix.h> 73#include <net/route.h> 74#include <net/vnet.h> 75 76#if defined(INET) || defined(INET6) 77#include <net/ethernet.h> 78#include <netinet/in.h> 79#include <netinet/in_var.h> 80#include <netinet/ip.h> 81#include <netinet/ip_carp.h> 82#ifdef INET 83#include <netinet/if_ether.h> 84#endif /* INET */ 85#ifdef INET6 86#include <netinet6/in6_var.h> 87#include <netinet6/in6_ifattach.h> 88#endif /* INET6 */ 89#endif /* INET || INET6 */ 90 91#include <security/mac/mac_framework.h> 92 93#ifdef COMPAT_FREEBSD32 94#include <sys/mount.h> 95#include <compat/freebsd32/freebsd32.h> 96#endif 97 98struct ifindex_entry { 99 struct ifnet *ife_ifnet; 100}; 101 102SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 103SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 104 105TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 106SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 107 &ifqmaxlen, 0, "max send queue size"); 108 109/* Log link state change events */ 110static int log_link_state_change = 1; 111 112SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 113 &log_link_state_change, 0, 114 "log interface link state change events"); 115 116/* Log promiscuous mode change events */ 117static int log_promisc_mode_change = 1; 118 119TUNABLE_INT("net.link.log_promisc_mode_change", &log_promisc_mode_change); 120SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 121 &log_promisc_mode_change, 1, 122 "log promiscuous mode change events"); 123 124/* Interface description */ 125static unsigned int ifdescr_maxlen = 1024; 126SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 127 &ifdescr_maxlen, 0, 128 "administrative maximum length for interface description"); 129 130static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 131 132/* global sx for non-critical path ifdescr */ 133static struct sx ifdescr_sx; 134SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 135 136void (*bridge_linkstate_p)(struct ifnet *ifp); 137void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 138void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 139/* These are external hooks for CARP. */ 140void (*carp_linkstate_p)(struct ifnet *ifp); 141void (*carp_demote_adj_p)(int, char *); 142int (*carp_master_p)(struct ifaddr *); 143#if defined(INET) || defined(INET6) 144int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 145int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 146 const struct sockaddr *sa); 147int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 148int (*carp_attach_p)(struct ifaddr *, int); 149void (*carp_detach_p)(struct ifaddr *); 150#endif 151#ifdef INET 152int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 153#endif 154#ifdef INET6 155struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 156caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 157 const struct in6_addr *taddr); 158#endif 159 160struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 161 162/* 163 * XXX: Style; these should be sorted alphabetically, and unprototyped 164 * static functions should be prototyped. Currently they are sorted by 165 * declaration order. 166 */ 167static void if_attachdomain(void *); 168static void if_attachdomain1(struct ifnet *); 169static int ifconf(u_long, caddr_t); 170static void if_freemulti(struct ifmultiaddr *); 171static void if_init(void *); 172static void if_grow(void); 173static void if_input_default(struct ifnet *, struct mbuf *); 174static void if_route(struct ifnet *, int flag, int fam); 175static int if_setflag(struct ifnet *, int, int, int *, int); 176static int if_transmit(struct ifnet *ifp, struct mbuf *m); 177static void if_unroute(struct ifnet *, int flag, int fam); 178static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 179static int if_rtdel(struct radix_node *, void *); 180static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 181static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 182static void do_link_state_change(void *, int); 183static int if_getgroup(struct ifgroupreq *, struct ifnet *); 184static int if_getgroupmembers(struct ifgroupreq *); 185static void if_delgroups(struct ifnet *); 186static void if_attach_internal(struct ifnet *, int, struct if_clone *); 187static int if_detach_internal(struct ifnet *, int, struct if_clone **); 188 189#ifdef INET6 190/* 191 * XXX: declare here to avoid to include many inet6 related files.. 192 * should be more generalized? 193 */ 194extern void nd6_setmtu(struct ifnet *); 195#endif 196 197VNET_DEFINE(int, if_index); 198int ifqmaxlen = IFQ_MAXLEN; 199VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 200VNET_DEFINE(struct ifgrouphead, ifg_head); 201 202static VNET_DEFINE(int, if_indexlim) = 8; 203 204/* Table of ifnet by index. */ 205VNET_DEFINE(struct ifindex_entry *, ifindex_table); 206 207#define V_if_indexlim VNET(if_indexlim) 208#define V_ifindex_table VNET(ifindex_table) 209 210/* 211 * The global network interface list (V_ifnet) and related state (such as 212 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 213 * an rwlock. Either may be acquired shared to stablize the list, but both 214 * must be acquired writable to modify the list. This model allows us to 215 * both stablize the interface list during interrupt thread processing, but 216 * also to stablize it over long-running ioctls, without introducing priority 217 * inversions and deadlocks. 218 */ 219struct rwlock ifnet_rwlock; 220struct sx ifnet_sxlock; 221 222/* 223 * The allocation of network interfaces is a rather non-atomic affair; we 224 * need to select an index before we are ready to expose the interface for 225 * use, so will use this pointer value to indicate reservation. 226 */ 227#define IFNET_HOLD (void *)(uintptr_t)(-1) 228 229static if_com_alloc_t *if_com_alloc[256]; 230static if_com_free_t *if_com_free[256]; 231 232static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 233MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 234MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 235 236struct ifnet * 237ifnet_byindex_locked(u_short idx) 238{ 239 240 if (idx > V_if_index) 241 return (NULL); 242 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 243 return (NULL); 244 return (V_ifindex_table[idx].ife_ifnet); 245} 246 247struct ifnet * 248ifnet_byindex(u_short idx) 249{ 250 struct ifnet *ifp; 251 252 IFNET_RLOCK_NOSLEEP(); 253 ifp = ifnet_byindex_locked(idx); 254 IFNET_RUNLOCK_NOSLEEP(); 255 return (ifp); 256} 257 258struct ifnet * 259ifnet_byindex_ref(u_short idx) 260{ 261 struct ifnet *ifp; 262 263 IFNET_RLOCK_NOSLEEP(); 264 ifp = ifnet_byindex_locked(idx); 265 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 266 IFNET_RUNLOCK_NOSLEEP(); 267 return (NULL); 268 } 269 if_ref(ifp); 270 IFNET_RUNLOCK_NOSLEEP(); 271 return (ifp); 272} 273 274/* 275 * Allocate an ifindex array entry; return 0 on success or an error on 276 * failure. 277 */ 278static int 279ifindex_alloc_locked(u_short *idxp) 280{ 281 u_short idx; 282 283 IFNET_WLOCK_ASSERT(); 284 285retry: 286 /* 287 * Try to find an empty slot below V_if_index. If we fail, take the 288 * next slot. 289 */ 290 for (idx = 1; idx <= V_if_index; idx++) { 291 if (V_ifindex_table[idx].ife_ifnet == NULL) 292 break; 293 } 294 295 /* Catch if_index overflow. */ 296 if (idx < 1) 297 return (ENOSPC); 298 if (idx >= V_if_indexlim) { 299 if_grow(); 300 goto retry; 301 } 302 if (idx > V_if_index) 303 V_if_index = idx; 304 *idxp = idx; 305 return (0); 306} 307 308static void 309ifindex_free_locked(u_short idx) 310{ 311 312 IFNET_WLOCK_ASSERT(); 313 314 V_ifindex_table[idx].ife_ifnet = NULL; 315 while (V_if_index > 0 && 316 V_ifindex_table[V_if_index].ife_ifnet == NULL) 317 V_if_index--; 318} 319 320static void 321ifindex_free(u_short idx) 322{ 323 324 IFNET_WLOCK(); 325 ifindex_free_locked(idx); 326 IFNET_WUNLOCK(); 327} 328 329static void 330ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 331{ 332 333 IFNET_WLOCK_ASSERT(); 334 335 V_ifindex_table[idx].ife_ifnet = ifp; 336} 337 338static void 339ifnet_setbyindex(u_short idx, struct ifnet *ifp) 340{ 341 342 IFNET_WLOCK(); 343 ifnet_setbyindex_locked(idx, ifp); 344 IFNET_WUNLOCK(); 345} 346 347struct ifaddr * 348ifaddr_byindex(u_short idx) 349{ 350 struct ifnet *ifp; 351 struct ifaddr *ifa = NULL; 352 353 IFNET_RLOCK_NOSLEEP(); 354 ifp = ifnet_byindex_locked(idx); 355 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 356 ifa_ref(ifa); 357 IFNET_RUNLOCK_NOSLEEP(); 358 return (ifa); 359} 360 361/* 362 * Network interface utility routines. 363 * 364 * Routines with ifa_ifwith* names take sockaddr *'s as 365 * parameters. 366 */ 367 368static void 369vnet_if_init(const void *unused __unused) 370{ 371 372 TAILQ_INIT(&V_ifnet); 373 TAILQ_INIT(&V_ifg_head); 374 IFNET_WLOCK(); 375 if_grow(); /* create initial table */ 376 IFNET_WUNLOCK(); 377 vnet_if_clone_init(); 378} 379VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 380 NULL); 381 382/* ARGSUSED*/ 383static void 384if_init(void *dummy __unused) 385{ 386 387 IFNET_LOCK_INIT(); 388 if_clone_init(); 389} 390SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 391 392 393#ifdef VIMAGE 394static void 395vnet_if_uninit(const void *unused __unused) 396{ 397 398 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 399 "not empty", __func__, __LINE__, &V_ifnet)); 400 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 401 "not empty", __func__, __LINE__, &V_ifg_head)); 402 403 free((caddr_t)V_ifindex_table, M_IFNET); 404} 405VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 406 vnet_if_uninit, NULL); 407#endif 408 409static void 410if_grow(void) 411{ 412 int oldlim; 413 u_int n; 414 struct ifindex_entry *e; 415 416 IFNET_WLOCK_ASSERT(); 417 oldlim = V_if_indexlim; 418 IFNET_WUNLOCK(); 419 n = (oldlim << 1) * sizeof(*e); 420 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 421 IFNET_WLOCK(); 422 if (V_if_indexlim != oldlim) { 423 free(e, M_IFNET); 424 return; 425 } 426 if (V_ifindex_table != NULL) { 427 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 428 free((caddr_t)V_ifindex_table, M_IFNET); 429 } 430 V_if_indexlim <<= 1; 431 V_ifindex_table = e; 432} 433 434/* 435 * Allocate a struct ifnet and an index for an interface. A layer 2 436 * common structure will also be allocated if an allocation routine is 437 * registered for the passed type. 438 */ 439struct ifnet * 440if_alloc(u_char type) 441{ 442 struct ifnet *ifp; 443 u_short idx; 444 445 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 446 IFNET_WLOCK(); 447 if (ifindex_alloc_locked(&idx) != 0) { 448 IFNET_WUNLOCK(); 449 free(ifp, M_IFNET); 450 return (NULL); 451 } 452 ifnet_setbyindex_locked(idx, IFNET_HOLD); 453 IFNET_WUNLOCK(); 454 ifp->if_index = idx; 455 ifp->if_type = type; 456 ifp->if_alloctype = type; 457 if (if_com_alloc[type] != NULL) { 458 ifp->if_l2com = if_com_alloc[type](type, ifp); 459 if (ifp->if_l2com == NULL) { 460 free(ifp, M_IFNET); 461 ifindex_free(idx); 462 return (NULL); 463 } 464 } 465 466 IF_ADDR_LOCK_INIT(ifp); 467 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 468 ifp->if_afdata_initialized = 0; 469 IF_AFDATA_LOCK_INIT(ifp); 470 TAILQ_INIT(&ifp->if_addrhead); 471 TAILQ_INIT(&ifp->if_multiaddrs); 472 TAILQ_INIT(&ifp->if_groups); 473#ifdef MAC 474 mac_ifnet_init(ifp); 475#endif 476 ifq_init(&ifp->if_snd, ifp); 477 478 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 479 ifnet_setbyindex(ifp->if_index, ifp); 480 return (ifp); 481} 482 483/* 484 * Do the actual work of freeing a struct ifnet, and layer 2 common 485 * structure. This call is made when the last reference to an 486 * interface is released. 487 */ 488static void 489if_free_internal(struct ifnet *ifp) 490{ 491 492 KASSERT((ifp->if_flags & IFF_DYING), 493 ("if_free_internal: interface not dying")); 494 495 if (if_com_free[ifp->if_alloctype] != NULL) 496 if_com_free[ifp->if_alloctype](ifp->if_l2com, 497 ifp->if_alloctype); 498 499#ifdef MAC 500 mac_ifnet_destroy(ifp); 501#endif /* MAC */ 502 if (ifp->if_description != NULL) 503 free(ifp->if_description, M_IFDESCR); 504 IF_AFDATA_DESTROY(ifp); 505 IF_ADDR_LOCK_DESTROY(ifp); 506 ifq_delete(&ifp->if_snd); 507 free(ifp, M_IFNET); 508} 509 510/* 511 * Deregister an interface and free the associated storage. 512 */ 513void 514if_free(struct ifnet *ifp) 515{ 516 517 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 518 519 CURVNET_SET_QUIET(ifp->if_vnet); 520 IFNET_WLOCK(); 521 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 522 ("%s: freeing unallocated ifnet", ifp->if_xname)); 523 524 ifindex_free_locked(ifp->if_index); 525 IFNET_WUNLOCK(); 526 527 if (refcount_release(&ifp->if_refcount)) 528 if_free_internal(ifp); 529 CURVNET_RESTORE(); 530} 531 532/* 533 * Interfaces to keep an ifnet type-stable despite the possibility of the 534 * driver calling if_free(). If there are additional references, we defer 535 * freeing the underlying data structure. 536 */ 537void 538if_ref(struct ifnet *ifp) 539{ 540 541 /* We don't assert the ifnet list lock here, but arguably should. */ 542 refcount_acquire(&ifp->if_refcount); 543} 544 545void 546if_rele(struct ifnet *ifp) 547{ 548 549 if (!refcount_release(&ifp->if_refcount)) 550 return; 551 if_free_internal(ifp); 552} 553 554void 555ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 556{ 557 558 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 559 560 if (ifq->ifq_maxlen == 0) 561 ifq->ifq_maxlen = ifqmaxlen; 562 563 ifq->altq_type = 0; 564 ifq->altq_disc = NULL; 565 ifq->altq_flags &= ALTQF_CANTCHANGE; 566 ifq->altq_tbr = NULL; 567 ifq->altq_ifp = ifp; 568} 569 570void 571ifq_delete(struct ifaltq *ifq) 572{ 573 mtx_destroy(&ifq->ifq_mtx); 574} 575 576/* 577 * Perform generic interface initalization tasks and attach the interface 578 * to the list of "active" interfaces. If vmove flag is set on entry 579 * to if_attach_internal(), perform only a limited subset of initialization 580 * tasks, given that we are moving from one vnet to another an ifnet which 581 * has already been fully initialized. 582 * 583 * Note that if_detach_internal() removes group membership unconditionally 584 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 585 * Thus, when if_vmove() is applied to a cloned interface, group membership 586 * is lost while a cloned one always joins a group whose name is 587 * ifc->ifc_name. To recover this after if_detach_internal() and 588 * if_attach_internal(), the cloner should be specified to 589 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 590 * attempts to join a group whose name is ifc->ifc_name. 591 * 592 * XXX: 593 * - The decision to return void and thus require this function to 594 * succeed is questionable. 595 * - We should probably do more sanity checking. For instance we don't 596 * do anything to insure if_xname is unique or non-empty. 597 */ 598void 599if_attach(struct ifnet *ifp) 600{ 601 602 if_attach_internal(ifp, 0, NULL); 603} 604 605/* 606 * Compute the least common TSO limit. 607 */ 608void 609if_hw_tsomax_common(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax) 610{ 611 /* 612 * 1) If there is no limit currently, take the limit from 613 * the network adapter. 614 * 615 * 2) If the network adapter has a limit below the current 616 * limit, apply it. 617 */ 618 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 619 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 620 pmax->tsomaxbytes = ifp->if_hw_tsomax; 621 } 622 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 623 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 624 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 625 } 626 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 627 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 628 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 629 } 630} 631 632/* 633 * Update TSO limit of a network adapter. 634 * 635 * Returns zero if no change. Else non-zero. 636 */ 637int 638if_hw_tsomax_update(struct ifnet *ifp, struct ifnet_hw_tsomax *pmax) 639{ 640 int retval = 0; 641 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 642 ifp->if_hw_tsomax = pmax->tsomaxbytes; 643 retval++; 644 } 645 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 646 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 647 retval++; 648 } 649 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 650 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 651 retval++; 652 } 653 return (retval); 654} 655 656static void 657if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 658{ 659 unsigned socksize, ifasize; 660 int namelen, masklen; 661 struct sockaddr_dl *sdl; 662 struct ifaddr *ifa; 663 664 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 665 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 666 ifp->if_xname); 667 668#ifdef VIMAGE 669 ifp->if_vnet = curvnet; 670 if (ifp->if_home_vnet == NULL) 671 ifp->if_home_vnet = curvnet; 672#endif 673 674 if_addgroup(ifp, IFG_ALL); 675 676 /* Restore group membership for cloned interfaces. */ 677 if (vmove && ifc != NULL) 678 if_clone_addgroup(ifp, ifc); 679 680 getmicrotime(&ifp->if_lastchange); 681 ifp->if_data.ifi_epoch = time_uptime; 682 ifp->if_data.ifi_datalen = sizeof(struct if_data); 683 684 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 685 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 686 ("transmit and qflush must both either be set or both be NULL")); 687 if (ifp->if_transmit == NULL) { 688 ifp->if_transmit = if_transmit; 689 ifp->if_qflush = if_qflush; 690 } 691 if (ifp->if_input == NULL) 692 ifp->if_input = if_input_default; 693 694 if (!vmove) { 695#ifdef MAC 696 mac_ifnet_create(ifp); 697#endif 698 699 /* 700 * Create a Link Level name for this device. 701 */ 702 namelen = strlen(ifp->if_xname); 703 /* 704 * Always save enough space for any possiable name so we 705 * can do a rename in place later. 706 */ 707 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 708 socksize = masklen + ifp->if_addrlen; 709 if (socksize < sizeof(*sdl)) 710 socksize = sizeof(*sdl); 711 socksize = roundup2(socksize, sizeof(long)); 712 ifasize = sizeof(*ifa) + 2 * socksize; 713 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 714 ifa_init(ifa); 715 sdl = (struct sockaddr_dl *)(ifa + 1); 716 sdl->sdl_len = socksize; 717 sdl->sdl_family = AF_LINK; 718 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 719 sdl->sdl_nlen = namelen; 720 sdl->sdl_index = ifp->if_index; 721 sdl->sdl_type = ifp->if_type; 722 ifp->if_addr = ifa; 723 ifa->ifa_ifp = ifp; 724 ifa->ifa_rtrequest = link_rtrequest; 725 ifa->ifa_addr = (struct sockaddr *)sdl; 726 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 727 ifa->ifa_netmask = (struct sockaddr *)sdl; 728 sdl->sdl_len = masklen; 729 while (namelen != 0) 730 sdl->sdl_data[--namelen] = 0xff; 731 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 732 /* Reliably crash if used uninitialized. */ 733 ifp->if_broadcastaddr = NULL; 734 735 if (ifp->if_type == IFT_ETHER) { 736 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 737 M_WAITOK | M_ZERO); 738 } 739 740#if defined(INET) || defined(INET6) 741 /* Use defaults for TSO, if nothing is set */ 742 if (ifp->if_hw_tsomax == 0 && 743 ifp->if_hw_tsomaxsegcount == 0 && 744 ifp->if_hw_tsomaxsegsize == 0) { 745 /* 746 * The TSO defaults needs to be such that an 747 * NFS mbuf list of 35 mbufs totalling just 748 * below 64K works and that a chain of mbufs 749 * can be defragged into at most 32 segments: 750 */ 751 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 752 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 753 ifp->if_hw_tsomaxsegcount = 35; 754 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 755 756 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 757 if (ifp->if_capabilities & IFCAP_TSO) { 758 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 759 ifp->if_hw_tsomax, 760 ifp->if_hw_tsomaxsegcount, 761 ifp->if_hw_tsomaxsegsize); 762 } 763 } 764#endif 765 } 766#ifdef VIMAGE 767 else { 768 /* 769 * Update the interface index in the link layer address 770 * of the interface. 771 */ 772 for (ifa = ifp->if_addr; ifa != NULL; 773 ifa = TAILQ_NEXT(ifa, ifa_link)) { 774 if (ifa->ifa_addr->sa_family == AF_LINK) { 775 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 776 sdl->sdl_index = ifp->if_index; 777 } 778 } 779 } 780#endif 781 782 IFNET_WLOCK(); 783 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 784#ifdef VIMAGE 785 curvnet->vnet_ifcnt++; 786#endif 787 IFNET_WUNLOCK(); 788 789 if (domain_init_status >= 2) 790 if_attachdomain1(ifp); 791 792 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 793 if (IS_DEFAULT_VNET(curvnet)) 794 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 795 796 /* Announce the interface. */ 797 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 798} 799 800static void 801if_attachdomain(void *dummy) 802{ 803 struct ifnet *ifp; 804 805 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 806 if_attachdomain1(ifp); 807} 808SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 809 if_attachdomain, NULL); 810 811static void 812if_attachdomain1(struct ifnet *ifp) 813{ 814 struct domain *dp; 815 816 /* 817 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 818 * cannot lock ifp->if_afdata initialization, entirely. 819 */ 820 if (IF_AFDATA_TRYLOCK(ifp) == 0) 821 return; 822 if (ifp->if_afdata_initialized >= domain_init_status) { 823 IF_AFDATA_UNLOCK(ifp); 824 log(LOG_WARNING, "%s called more than once on %s\n", 825 __func__, ifp->if_xname); 826 return; 827 } 828 ifp->if_afdata_initialized = domain_init_status; 829 IF_AFDATA_UNLOCK(ifp); 830 831 /* address family dependent data region */ 832 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 833 for (dp = domains; dp; dp = dp->dom_next) { 834 if (dp->dom_ifattach) 835 ifp->if_afdata[dp->dom_family] = 836 (*dp->dom_ifattach)(ifp); 837 } 838} 839 840/* 841 * Remove any unicast or broadcast network addresses from an interface. 842 */ 843void 844if_purgeaddrs(struct ifnet *ifp) 845{ 846 struct ifaddr *ifa, *next; 847 848 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 849 if (ifa->ifa_addr->sa_family == AF_LINK) 850 continue; 851#ifdef INET 852 /* XXX: Ugly!! ad hoc just for INET */ 853 if (ifa->ifa_addr->sa_family == AF_INET) { 854 struct ifaliasreq ifr; 855 856 bzero(&ifr, sizeof(ifr)); 857 ifr.ifra_addr = *ifa->ifa_addr; 858 if (ifa->ifa_dstaddr) 859 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 860 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 861 NULL) == 0) 862 continue; 863 } 864#endif /* INET */ 865#ifdef INET6 866 if (ifa->ifa_addr->sa_family == AF_INET6) { 867 in6_purgeaddr(ifa); 868 /* ifp_addrhead is already updated */ 869 continue; 870 } 871#endif /* INET6 */ 872 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 873 ifa_free(ifa); 874 } 875} 876 877/* 878 * Remove any multicast network addresses from an interface when an ifnet 879 * is going away. 880 */ 881static void 882if_purgemaddrs(struct ifnet *ifp) 883{ 884 struct ifmultiaddr *ifma; 885 struct ifmultiaddr *next; 886 887 IF_ADDR_WLOCK(ifp); 888 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 889 if_delmulti_locked(ifp, ifma, 1); 890 IF_ADDR_WUNLOCK(ifp); 891} 892 893/* 894 * Detach an interface, removing it from the list of "active" interfaces. 895 * If vmove flag is set on entry to if_detach_internal(), perform only a 896 * limited subset of cleanup tasks, given that we are moving an ifnet from 897 * one vnet to another, where it must be fully operational. 898 * 899 * XXXRW: There are some significant questions about event ordering, and 900 * how to prevent things from starting to use the interface during detach. 901 */ 902void 903if_detach(struct ifnet *ifp) 904{ 905 906 CURVNET_SET_QUIET(ifp->if_vnet); 907 if_detach_internal(ifp, 0, NULL); 908 CURVNET_RESTORE(); 909} 910 911static int 912if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 913{ 914 struct ifaddr *ifa; 915 struct radix_node_head *rnh; 916 int i, j; 917 struct domain *dp; 918 struct ifnet *iter; 919 int found = 0; 920 921 IFNET_WLOCK(); 922 TAILQ_FOREACH(iter, &V_ifnet, if_link) 923 if (iter == ifp) { 924 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 925 found = 1; 926 break; 927 } 928#ifdef VIMAGE 929 if (found) 930 curvnet->vnet_ifcnt--; 931#endif 932 IFNET_WUNLOCK(); 933 if (!found) { 934 /* 935 * While we would want to panic here, we cannot 936 * guarantee that the interface is indeed still on 937 * the list given we don't hold locks all the way. 938 */ 939 return (ENOENT); 940#if 0 941 if (vmove) 942 panic("%s: ifp=%p not on the ifnet tailq %p", 943 __func__, ifp, &V_ifnet); 944 else 945 return; /* XXX this should panic as well? */ 946#endif 947 } 948 949 /* Check if this is a cloned interface or not. */ 950 if (vmove && ifcp != NULL) 951 *ifcp = if_clone_findifc(ifp); 952 953 /* 954 * Remove/wait for pending events. 955 */ 956 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 957 958 /* 959 * Remove routes and flush queues. 960 */ 961 if_down(ifp); 962#ifdef ALTQ 963 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 964 altq_disable(&ifp->if_snd); 965 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 966 altq_detach(&ifp->if_snd); 967#endif 968 969 if_purgeaddrs(ifp); 970 971#ifdef INET 972 in_ifdetach(ifp); 973#endif 974 975#ifdef INET6 976 /* 977 * Remove all IPv6 kernel structs related to ifp. This should be done 978 * before removing routing entries below, since IPv6 interface direct 979 * routes are expected to be removed by the IPv6-specific kernel API. 980 * Otherwise, the kernel will detect some inconsistency and bark it. 981 */ 982 in6_ifdetach(ifp); 983#endif 984 if_purgemaddrs(ifp); 985 986 /* Announce that the interface is gone. */ 987 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 988 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 989 if (IS_DEFAULT_VNET(curvnet)) 990 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 991 992 if (!vmove) { 993 /* 994 * Prevent further calls into the device driver via ifnet. 995 */ 996 if_dead(ifp); 997 998 /* 999 * Remove link ifaddr pointer and maybe decrement if_index. 1000 * Clean up all addresses. 1001 */ 1002 free(ifp->if_hw_addr, M_IFADDR); 1003 ifp->if_hw_addr = NULL; 1004 ifp->if_addr = NULL; 1005 1006 /* We can now free link ifaddr. */ 1007 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 1008 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1009 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 1010 ifa_free(ifa); 1011 } 1012 } 1013 1014 /* 1015 * Delete all remaining routes using this interface 1016 * Unfortuneatly the only way to do this is to slog through 1017 * the entire routing table looking for routes which point 1018 * to this interface...oh well... 1019 */ 1020 for (i = 1; i <= AF_MAX; i++) { 1021 for (j = 0; j < rt_numfibs; j++) { 1022 rnh = rt_tables_get_rnh(j, i); 1023 if (rnh == NULL) 1024 continue; 1025 RADIX_NODE_HEAD_LOCK(rnh); 1026 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 1027 RADIX_NODE_HEAD_UNLOCK(rnh); 1028 } 1029 } 1030 1031 if_delgroups(ifp); 1032 1033 /* 1034 * We cannot hold the lock over dom_ifdetach calls as they might 1035 * sleep, for example trying to drain a callout, thus open up the 1036 * theoretical race with re-attaching. 1037 */ 1038 IF_AFDATA_LOCK(ifp); 1039 i = ifp->if_afdata_initialized; 1040 ifp->if_afdata_initialized = 0; 1041 IF_AFDATA_UNLOCK(ifp); 1042 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1043 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 1044 (*dp->dom_ifdetach)(ifp, 1045 ifp->if_afdata[dp->dom_family]); 1046 } 1047 1048 return (0); 1049} 1050 1051#ifdef VIMAGE 1052/* 1053 * if_vmove() performs a limited version of if_detach() in current 1054 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1055 * An attempt is made to shrink if_index in current vnet, find an 1056 * unused if_index in target vnet and calls if_grow() if necessary, 1057 * and finally find an unused if_xname for the target vnet. 1058 */ 1059void 1060if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1061{ 1062 u_short idx; 1063 struct if_clone *ifc; 1064 int rc; 1065 1066 /* 1067 * Detach from current vnet, but preserve LLADDR info, do not 1068 * mark as dead etc. so that the ifnet can be reattached later. 1069 * If we cannot find it, we lost the race to someone else. 1070 */ 1071 rc = if_detach_internal(ifp, 1, &ifc); 1072 if (rc != 0) 1073 return; 1074 1075 /* 1076 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1077 * the if_index for that vnet if possible. 1078 * 1079 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1080 * or we'd lock on one vnet and unlock on another. 1081 */ 1082 IFNET_WLOCK(); 1083 ifindex_free_locked(ifp->if_index); 1084 IFNET_WUNLOCK(); 1085 1086 /* 1087 * Perform interface-specific reassignment tasks, if provided by 1088 * the driver. 1089 */ 1090 if (ifp->if_reassign != NULL) 1091 ifp->if_reassign(ifp, new_vnet, NULL); 1092 1093 /* 1094 * Switch to the context of the target vnet. 1095 */ 1096 CURVNET_SET_QUIET(new_vnet); 1097 1098 IFNET_WLOCK(); 1099 if (ifindex_alloc_locked(&idx) != 0) { 1100 IFNET_WUNLOCK(); 1101 panic("if_index overflow"); 1102 } 1103 ifp->if_index = idx; 1104 ifnet_setbyindex_locked(ifp->if_index, ifp); 1105 IFNET_WUNLOCK(); 1106 1107 if_attach_internal(ifp, 1, ifc); 1108 1109 CURVNET_RESTORE(); 1110} 1111 1112/* 1113 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1114 */ 1115static int 1116if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1117{ 1118 struct prison *pr; 1119 struct ifnet *difp; 1120 1121 /* Try to find the prison within our visibility. */ 1122 sx_slock(&allprison_lock); 1123 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1124 sx_sunlock(&allprison_lock); 1125 if (pr == NULL) 1126 return (ENXIO); 1127 prison_hold_locked(pr); 1128 mtx_unlock(&pr->pr_mtx); 1129 1130 /* Do not try to move the iface from and to the same prison. */ 1131 if (pr->pr_vnet == ifp->if_vnet) { 1132 prison_free(pr); 1133 return (EEXIST); 1134 } 1135 1136 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1137 /* XXX Lock interfaces to avoid races. */ 1138 CURVNET_SET_QUIET(pr->pr_vnet); 1139 difp = ifunit(ifname); 1140 CURVNET_RESTORE(); 1141 if (difp != NULL) { 1142 prison_free(pr); 1143 return (EEXIST); 1144 } 1145 1146 /* Move the interface into the child jail/vnet. */ 1147 if_vmove(ifp, pr->pr_vnet); 1148 1149 /* Report the new if_xname back to the userland. */ 1150 sprintf(ifname, "%s", ifp->if_xname); 1151 1152 prison_free(pr); 1153 return (0); 1154} 1155 1156static int 1157if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1158{ 1159 struct prison *pr; 1160 struct vnet *vnet_dst; 1161 struct ifnet *ifp; 1162 1163 /* Try to find the prison within our visibility. */ 1164 sx_slock(&allprison_lock); 1165 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1166 sx_sunlock(&allprison_lock); 1167 if (pr == NULL) 1168 return (ENXIO); 1169 prison_hold_locked(pr); 1170 mtx_unlock(&pr->pr_mtx); 1171 1172 /* Make sure the named iface exists in the source prison/vnet. */ 1173 CURVNET_SET(pr->pr_vnet); 1174 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1175 if (ifp == NULL) { 1176 CURVNET_RESTORE(); 1177 prison_free(pr); 1178 return (ENXIO); 1179 } 1180 1181 /* Do not try to move the iface from and to the same prison. */ 1182 vnet_dst = TD_TO_VNET(td); 1183 if (vnet_dst == ifp->if_vnet) { 1184 CURVNET_RESTORE(); 1185 prison_free(pr); 1186 return (EEXIST); 1187 } 1188 1189 /* Get interface back from child jail/vnet. */ 1190 if_vmove(ifp, vnet_dst); 1191 CURVNET_RESTORE(); 1192 1193 /* Report the new if_xname back to the userland. */ 1194 sprintf(ifname, "%s", ifp->if_xname); 1195 1196 prison_free(pr); 1197 return (0); 1198} 1199#endif /* VIMAGE */ 1200 1201/* 1202 * Add a group to an interface 1203 */ 1204int 1205if_addgroup(struct ifnet *ifp, const char *groupname) 1206{ 1207 struct ifg_list *ifgl; 1208 struct ifg_group *ifg = NULL; 1209 struct ifg_member *ifgm; 1210 int new = 0; 1211 1212 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1213 groupname[strlen(groupname) - 1] <= '9') 1214 return (EINVAL); 1215 1216 IFNET_WLOCK(); 1217 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1218 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1219 IFNET_WUNLOCK(); 1220 return (EEXIST); 1221 } 1222 1223 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1224 M_NOWAIT)) == NULL) { 1225 IFNET_WUNLOCK(); 1226 return (ENOMEM); 1227 } 1228 1229 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1230 M_TEMP, M_NOWAIT)) == NULL) { 1231 free(ifgl, M_TEMP); 1232 IFNET_WUNLOCK(); 1233 return (ENOMEM); 1234 } 1235 1236 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1237 if (!strcmp(ifg->ifg_group, groupname)) 1238 break; 1239 1240 if (ifg == NULL) { 1241 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1242 M_TEMP, M_NOWAIT)) == NULL) { 1243 free(ifgl, M_TEMP); 1244 free(ifgm, M_TEMP); 1245 IFNET_WUNLOCK(); 1246 return (ENOMEM); 1247 } 1248 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1249 ifg->ifg_refcnt = 0; 1250 TAILQ_INIT(&ifg->ifg_members); 1251 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1252 new = 1; 1253 } 1254 1255 ifg->ifg_refcnt++; 1256 ifgl->ifgl_group = ifg; 1257 ifgm->ifgm_ifp = ifp; 1258 1259 IF_ADDR_WLOCK(ifp); 1260 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1261 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1262 IF_ADDR_WUNLOCK(ifp); 1263 1264 IFNET_WUNLOCK(); 1265 1266 if (new) 1267 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1268 EVENTHANDLER_INVOKE(group_change_event, groupname); 1269 1270 return (0); 1271} 1272 1273/* 1274 * Remove a group from an interface 1275 */ 1276int 1277if_delgroup(struct ifnet *ifp, const char *groupname) 1278{ 1279 struct ifg_list *ifgl; 1280 struct ifg_member *ifgm; 1281 1282 IFNET_WLOCK(); 1283 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1284 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1285 break; 1286 if (ifgl == NULL) { 1287 IFNET_WUNLOCK(); 1288 return (ENOENT); 1289 } 1290 1291 IF_ADDR_WLOCK(ifp); 1292 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1293 IF_ADDR_WUNLOCK(ifp); 1294 1295 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1296 if (ifgm->ifgm_ifp == ifp) 1297 break; 1298 1299 if (ifgm != NULL) { 1300 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1301 free(ifgm, M_TEMP); 1302 } 1303 1304 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1305 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1306 IFNET_WUNLOCK(); 1307 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1308 free(ifgl->ifgl_group, M_TEMP); 1309 } else 1310 IFNET_WUNLOCK(); 1311 1312 free(ifgl, M_TEMP); 1313 1314 EVENTHANDLER_INVOKE(group_change_event, groupname); 1315 1316 return (0); 1317} 1318 1319/* 1320 * Remove an interface from all groups 1321 */ 1322static void 1323if_delgroups(struct ifnet *ifp) 1324{ 1325 struct ifg_list *ifgl; 1326 struct ifg_member *ifgm; 1327 char groupname[IFNAMSIZ]; 1328 1329 IFNET_WLOCK(); 1330 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1331 ifgl = TAILQ_FIRST(&ifp->if_groups); 1332 1333 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1334 1335 IF_ADDR_WLOCK(ifp); 1336 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1337 IF_ADDR_WUNLOCK(ifp); 1338 1339 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1340 if (ifgm->ifgm_ifp == ifp) 1341 break; 1342 1343 if (ifgm != NULL) { 1344 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1345 ifgm_next); 1346 free(ifgm, M_TEMP); 1347 } 1348 1349 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1350 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1351 IFNET_WUNLOCK(); 1352 EVENTHANDLER_INVOKE(group_detach_event, 1353 ifgl->ifgl_group); 1354 free(ifgl->ifgl_group, M_TEMP); 1355 } else 1356 IFNET_WUNLOCK(); 1357 1358 free(ifgl, M_TEMP); 1359 1360 EVENTHANDLER_INVOKE(group_change_event, groupname); 1361 1362 IFNET_WLOCK(); 1363 } 1364 IFNET_WUNLOCK(); 1365} 1366 1367/* 1368 * Stores all groups from an interface in memory pointed 1369 * to by data 1370 */ 1371static int 1372if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1373{ 1374 int len, error; 1375 struct ifg_list *ifgl; 1376 struct ifg_req ifgrq, *ifgp; 1377 struct ifgroupreq *ifgr = data; 1378 1379 if (ifgr->ifgr_len == 0) { 1380 IF_ADDR_RLOCK(ifp); 1381 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1382 ifgr->ifgr_len += sizeof(struct ifg_req); 1383 IF_ADDR_RUNLOCK(ifp); 1384 return (0); 1385 } 1386 1387 len = ifgr->ifgr_len; 1388 ifgp = ifgr->ifgr_groups; 1389 /* XXX: wire */ 1390 IF_ADDR_RLOCK(ifp); 1391 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1392 if (len < sizeof(ifgrq)) { 1393 IF_ADDR_RUNLOCK(ifp); 1394 return (EINVAL); 1395 } 1396 bzero(&ifgrq, sizeof ifgrq); 1397 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1398 sizeof(ifgrq.ifgrq_group)); 1399 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1400 IF_ADDR_RUNLOCK(ifp); 1401 return (error); 1402 } 1403 len -= sizeof(ifgrq); 1404 ifgp++; 1405 } 1406 IF_ADDR_RUNLOCK(ifp); 1407 1408 return (0); 1409} 1410 1411/* 1412 * Stores all members of a group in memory pointed to by data 1413 */ 1414static int 1415if_getgroupmembers(struct ifgroupreq *data) 1416{ 1417 struct ifgroupreq *ifgr = data; 1418 struct ifg_group *ifg; 1419 struct ifg_member *ifgm; 1420 struct ifg_req ifgrq, *ifgp; 1421 int len, error; 1422 1423 IFNET_RLOCK(); 1424 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1425 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1426 break; 1427 if (ifg == NULL) { 1428 IFNET_RUNLOCK(); 1429 return (ENOENT); 1430 } 1431 1432 if (ifgr->ifgr_len == 0) { 1433 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1434 ifgr->ifgr_len += sizeof(ifgrq); 1435 IFNET_RUNLOCK(); 1436 return (0); 1437 } 1438 1439 len = ifgr->ifgr_len; 1440 ifgp = ifgr->ifgr_groups; 1441 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1442 if (len < sizeof(ifgrq)) { 1443 IFNET_RUNLOCK(); 1444 return (EINVAL); 1445 } 1446 bzero(&ifgrq, sizeof ifgrq); 1447 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1448 sizeof(ifgrq.ifgrq_member)); 1449 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1450 IFNET_RUNLOCK(); 1451 return (error); 1452 } 1453 len -= sizeof(ifgrq); 1454 ifgp++; 1455 } 1456 IFNET_RUNLOCK(); 1457 1458 return (0); 1459} 1460 1461/* 1462 * Delete Routes for a Network Interface 1463 * 1464 * Called for each routing entry via the rnh->rnh_walktree() call above 1465 * to delete all route entries referencing a detaching network interface. 1466 * 1467 * Arguments: 1468 * rn pointer to node in the routing table 1469 * arg argument passed to rnh->rnh_walktree() - detaching interface 1470 * 1471 * Returns: 1472 * 0 successful 1473 * errno failed - reason indicated 1474 * 1475 */ 1476static int 1477if_rtdel(struct radix_node *rn, void *arg) 1478{ 1479 struct rtentry *rt = (struct rtentry *)rn; 1480 struct ifnet *ifp = arg; 1481 int err; 1482 1483 if (rt->rt_ifp == ifp) { 1484 1485 /* 1486 * Protect (sorta) against walktree recursion problems 1487 * with cloned routes 1488 */ 1489 if ((rt->rt_flags & RTF_UP) == 0) 1490 return (0); 1491 1492 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1493 rt_mask(rt), 1494 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1495 (struct rtentry **) NULL, rt->rt_fibnum); 1496 if (err) { 1497 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1498 } 1499 } 1500 1501 return (0); 1502} 1503 1504/* 1505 * A compatibility function returns ifnet counter values. 1506 */ 1507uint64_t 1508if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1509{ 1510 1511 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1512 switch (cnt) { 1513 case IFCOUNTER_IPACKETS: 1514 return (ifp->if_ipackets); 1515 case IFCOUNTER_IERRORS: 1516 return (ifp->if_ierrors); 1517 case IFCOUNTER_OPACKETS: 1518 return (ifp->if_opackets); 1519 case IFCOUNTER_OERRORS: 1520 return (ifp->if_oerrors); 1521 case IFCOUNTER_COLLISIONS: 1522 return (ifp->if_collisions); 1523 case IFCOUNTER_IBYTES: 1524 return (ifp->if_ibytes); 1525 case IFCOUNTER_OBYTES: 1526 return (ifp->if_obytes); 1527 case IFCOUNTER_IMCASTS: 1528 return (ifp->if_imcasts); 1529 case IFCOUNTER_OMCASTS: 1530 return (ifp->if_omcasts); 1531 case IFCOUNTER_IQDROPS: 1532 return (ifp->if_iqdrops); 1533#ifdef _IFI_OQDROPS 1534 case IFCOUNTER_OQDROPS: 1535 return (ifp->if_oqdrops); 1536#endif 1537 case IFCOUNTER_NOPROTO: 1538 return (ifp->if_noproto); 1539 default: 1540 break; 1541 }; 1542 return (0); 1543} 1544 1545/* 1546 * Increase an ifnet counter. Usually used for counters shared 1547 * between the stack and a driver, but function supports them all. 1548 */ 1549void 1550if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1551{ 1552 1553 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1554 switch (cnt) { 1555 case IFCOUNTER_IPACKETS: 1556 ifp->if_ipackets += inc; 1557 break; 1558 case IFCOUNTER_IERRORS: 1559 ifp->if_ierrors += inc; 1560 break; 1561 case IFCOUNTER_OPACKETS: 1562 ifp->if_opackets += inc; 1563 break; 1564 case IFCOUNTER_OERRORS: 1565 ifp->if_oerrors += inc; 1566 break; 1567 case IFCOUNTER_COLLISIONS: 1568 ifp->if_collisions += inc; 1569 break; 1570 case IFCOUNTER_IBYTES: 1571 ifp->if_ibytes += inc; 1572 break; 1573 case IFCOUNTER_OBYTES: 1574 ifp->if_obytes += inc; 1575 break; 1576 case IFCOUNTER_IMCASTS: 1577 ifp->if_imcasts += inc; 1578 break; 1579 case IFCOUNTER_OMCASTS: 1580 ifp->if_omcasts += inc; 1581 break; 1582 case IFCOUNTER_IQDROPS: 1583 ifp->if_iqdrops += inc; 1584 break; 1585#ifdef _IFI_OQDROPS 1586 case IFCOUNTER_OQDROPS: 1587 ifp->if_oqdrops += inc; 1588 break; 1589#endif 1590 case IFCOUNTER_NOPROTO: 1591 ifp->if_noproto += inc; 1592 break; 1593 default: 1594 break; 1595 }; 1596} 1597 1598/* 1599 * Wrapper functions for struct ifnet address list locking macros. These are 1600 * used by kernel modules to avoid encoding programming interface or binary 1601 * interface assumptions that may be violated when kernel-internal locking 1602 * approaches change. 1603 */ 1604void 1605if_addr_rlock(struct ifnet *ifp) 1606{ 1607 1608 IF_ADDR_RLOCK(ifp); 1609} 1610 1611void 1612if_addr_runlock(struct ifnet *ifp) 1613{ 1614 1615 IF_ADDR_RUNLOCK(ifp); 1616} 1617 1618void 1619if_maddr_rlock(struct ifnet *ifp) 1620{ 1621 1622 IF_ADDR_RLOCK(ifp); 1623} 1624 1625void 1626if_maddr_runlock(struct ifnet *ifp) 1627{ 1628 1629 IF_ADDR_RUNLOCK(ifp); 1630} 1631 1632/* 1633 * Initialization, destruction and refcounting functions for ifaddrs. 1634 */ 1635void 1636ifa_init(struct ifaddr *ifa) 1637{ 1638 1639 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1640 refcount_init(&ifa->ifa_refcnt, 1); 1641 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1642} 1643 1644void 1645ifa_ref(struct ifaddr *ifa) 1646{ 1647 1648 refcount_acquire(&ifa->ifa_refcnt); 1649} 1650 1651void 1652ifa_free(struct ifaddr *ifa) 1653{ 1654 1655 if (refcount_release(&ifa->ifa_refcnt)) { 1656 mtx_destroy(&ifa->ifa_mtx); 1657 free(ifa, M_IFADDR); 1658 } 1659} 1660 1661int 1662ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1663{ 1664 int error = 0; 1665 struct rtentry *rt = NULL; 1666 struct rt_addrinfo info; 1667 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1668 1669 bzero(&info, sizeof(info)); 1670 info.rti_ifp = V_loif; 1671 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1672 info.rti_info[RTAX_DST] = ia; 1673 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1674 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib); 1675 1676 if (error == 0 && rt != NULL) { 1677 RT_LOCK(rt); 1678 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1679 ifa->ifa_ifp->if_type; 1680 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1681 ifa->ifa_ifp->if_index; 1682 RT_REMREF(rt); 1683 RT_UNLOCK(rt); 1684 } else if (error != 0) 1685 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1686 1687 return (error); 1688} 1689 1690int 1691ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1692{ 1693 int error = 0; 1694 struct rt_addrinfo info; 1695 struct sockaddr_dl null_sdl; 1696 1697 bzero(&null_sdl, sizeof(null_sdl)); 1698 null_sdl.sdl_len = sizeof(null_sdl); 1699 null_sdl.sdl_family = AF_LINK; 1700 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1701 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1702 bzero(&info, sizeof(info)); 1703 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1704 info.rti_info[RTAX_DST] = ia; 1705 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1706 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib); 1707 1708 if (error != 0) 1709 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1710 1711 return (error); 1712} 1713 1714/* 1715 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1716 * structs used to represent other address families, it is necessary 1717 * to perform a different comparison. 1718 */ 1719 1720#define sa_equal(a1, a2) \ 1721 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1722 1723#define sa_dl_equal(a1, a2) \ 1724 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1725 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1726 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1727 LLADDR((struct sockaddr_dl *)(a2)), \ 1728 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1729 1730/* 1731 * Locate an interface based on a complete address. 1732 */ 1733/*ARGSUSED*/ 1734static struct ifaddr * 1735ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1736{ 1737 struct ifnet *ifp; 1738 struct ifaddr *ifa; 1739 1740 IFNET_RLOCK_NOSLEEP(); 1741 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1742 IF_ADDR_RLOCK(ifp); 1743 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1744 if (ifa->ifa_addr->sa_family != addr->sa_family) 1745 continue; 1746 if (sa_equal(addr, ifa->ifa_addr)) { 1747 if (getref) 1748 ifa_ref(ifa); 1749 IF_ADDR_RUNLOCK(ifp); 1750 goto done; 1751 } 1752 /* IP6 doesn't have broadcast */ 1753 if ((ifp->if_flags & IFF_BROADCAST) && 1754 ifa->ifa_broadaddr && 1755 ifa->ifa_broadaddr->sa_len != 0 && 1756 sa_equal(ifa->ifa_broadaddr, addr)) { 1757 if (getref) 1758 ifa_ref(ifa); 1759 IF_ADDR_RUNLOCK(ifp); 1760 goto done; 1761 } 1762 } 1763 IF_ADDR_RUNLOCK(ifp); 1764 } 1765 ifa = NULL; 1766done: 1767 IFNET_RUNLOCK_NOSLEEP(); 1768 return (ifa); 1769} 1770 1771struct ifaddr * 1772ifa_ifwithaddr(struct sockaddr *addr) 1773{ 1774 1775 return (ifa_ifwithaddr_internal(addr, 1)); 1776} 1777 1778int 1779ifa_ifwithaddr_check(struct sockaddr *addr) 1780{ 1781 1782 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1783} 1784 1785/* 1786 * Locate an interface based on the broadcast address. 1787 */ 1788/* ARGSUSED */ 1789struct ifaddr * 1790ifa_ifwithbroadaddr(struct sockaddr *addr) 1791{ 1792 struct ifnet *ifp; 1793 struct ifaddr *ifa; 1794 1795 IFNET_RLOCK_NOSLEEP(); 1796 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1797 IF_ADDR_RLOCK(ifp); 1798 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1799 if (ifa->ifa_addr->sa_family != addr->sa_family) 1800 continue; 1801 if ((ifp->if_flags & IFF_BROADCAST) && 1802 ifa->ifa_broadaddr && 1803 ifa->ifa_broadaddr->sa_len != 0 && 1804 sa_equal(ifa->ifa_broadaddr, addr)) { 1805 ifa_ref(ifa); 1806 IF_ADDR_RUNLOCK(ifp); 1807 goto done; 1808 } 1809 } 1810 IF_ADDR_RUNLOCK(ifp); 1811 } 1812 ifa = NULL; 1813done: 1814 IFNET_RUNLOCK_NOSLEEP(); 1815 return (ifa); 1816} 1817 1818/* 1819 * Locate the point to point interface with a given destination address. 1820 */ 1821/*ARGSUSED*/ 1822struct ifaddr * 1823ifa_ifwithdstaddr_fib(struct sockaddr *addr, int fibnum) 1824{ 1825 struct ifnet *ifp; 1826 struct ifaddr *ifa; 1827 1828 IFNET_RLOCK_NOSLEEP(); 1829 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1830 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1831 continue; 1832 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1833 continue; 1834 IF_ADDR_RLOCK(ifp); 1835 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1836 if (ifa->ifa_addr->sa_family != addr->sa_family) 1837 continue; 1838 if (ifa->ifa_dstaddr != NULL && 1839 sa_equal(addr, ifa->ifa_dstaddr)) { 1840 ifa_ref(ifa); 1841 IF_ADDR_RUNLOCK(ifp); 1842 goto done; 1843 } 1844 } 1845 IF_ADDR_RUNLOCK(ifp); 1846 } 1847 ifa = NULL; 1848done: 1849 IFNET_RUNLOCK_NOSLEEP(); 1850 return (ifa); 1851} 1852 1853struct ifaddr * 1854ifa_ifwithdstaddr(struct sockaddr *addr) 1855{ 1856 1857 return (ifa_ifwithdstaddr_fib(addr, RT_ALL_FIBS)); 1858} 1859 1860/* 1861 * Find an interface on a specific network. If many, choice 1862 * is most specific found. 1863 */ 1864struct ifaddr * 1865ifa_ifwithnet_fib(struct sockaddr *addr, int ignore_ptp, int fibnum) 1866{ 1867 struct ifnet *ifp; 1868 struct ifaddr *ifa; 1869 struct ifaddr *ifa_maybe = NULL; 1870 u_int af = addr->sa_family; 1871 char *addr_data = addr->sa_data, *cplim; 1872 1873 /* 1874 * AF_LINK addresses can be looked up directly by their index number, 1875 * so do that if we can. 1876 */ 1877 if (af == AF_LINK) { 1878 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1879 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1880 return (ifaddr_byindex(sdl->sdl_index)); 1881 } 1882 1883 /* 1884 * Scan though each interface, looking for ones that have addresses 1885 * in this address family and the requested fib. Maintain a reference 1886 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 1887 * kept it stable when we move onto the next interface. 1888 */ 1889 IFNET_RLOCK_NOSLEEP(); 1890 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1891 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1892 continue; 1893 IF_ADDR_RLOCK(ifp); 1894 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1895 char *cp, *cp2, *cp3; 1896 1897 if (ifa->ifa_addr->sa_family != af) 1898next: continue; 1899 if (af == AF_INET && 1900 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1901 /* 1902 * This is a bit broken as it doesn't 1903 * take into account that the remote end may 1904 * be a single node in the network we are 1905 * looking for. 1906 * The trouble is that we don't know the 1907 * netmask for the remote end. 1908 */ 1909 if (ifa->ifa_dstaddr != NULL && 1910 sa_equal(addr, ifa->ifa_dstaddr)) { 1911 ifa_ref(ifa); 1912 IF_ADDR_RUNLOCK(ifp); 1913 goto done; 1914 } 1915 } else { 1916 /* 1917 * if we have a special address handler, 1918 * then use it instead of the generic one. 1919 */ 1920 if (ifa->ifa_claim_addr) { 1921 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1922 ifa_ref(ifa); 1923 IF_ADDR_RUNLOCK(ifp); 1924 goto done; 1925 } 1926 continue; 1927 } 1928 1929 /* 1930 * Scan all the bits in the ifa's address. 1931 * If a bit dissagrees with what we are 1932 * looking for, mask it with the netmask 1933 * to see if it really matters. 1934 * (A byte at a time) 1935 */ 1936 if (ifa->ifa_netmask == 0) 1937 continue; 1938 cp = addr_data; 1939 cp2 = ifa->ifa_addr->sa_data; 1940 cp3 = ifa->ifa_netmask->sa_data; 1941 cplim = ifa->ifa_netmask->sa_len 1942 + (char *)ifa->ifa_netmask; 1943 while (cp3 < cplim) 1944 if ((*cp++ ^ *cp2++) & *cp3++) 1945 goto next; /* next address! */ 1946 /* 1947 * If the netmask of what we just found 1948 * is more specific than what we had before 1949 * (if we had one), or if the virtual status 1950 * of new prefix is better than of the old one, 1951 * then remember the new one before continuing 1952 * to search for an even better one. 1953 */ 1954 if (ifa_maybe == NULL || 1955 ifa_preferred(ifa_maybe, ifa) || 1956 rn_refines((caddr_t)ifa->ifa_netmask, 1957 (caddr_t)ifa_maybe->ifa_netmask)) { 1958 if (ifa_maybe != NULL) 1959 ifa_free(ifa_maybe); 1960 ifa_maybe = ifa; 1961 ifa_ref(ifa_maybe); 1962 } 1963 } 1964 } 1965 IF_ADDR_RUNLOCK(ifp); 1966 } 1967 ifa = ifa_maybe; 1968 ifa_maybe = NULL; 1969done: 1970 IFNET_RUNLOCK_NOSLEEP(); 1971 if (ifa_maybe != NULL) 1972 ifa_free(ifa_maybe); 1973 return (ifa); 1974} 1975 1976struct ifaddr * 1977ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1978{ 1979 1980 return (ifa_ifwithnet_fib(addr, ignore_ptp, RT_ALL_FIBS)); 1981} 1982 1983/* 1984 * Find an interface address specific to an interface best matching 1985 * a given address. 1986 */ 1987struct ifaddr * 1988ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1989{ 1990 struct ifaddr *ifa; 1991 char *cp, *cp2, *cp3; 1992 char *cplim; 1993 struct ifaddr *ifa_maybe = NULL; 1994 u_int af = addr->sa_family; 1995 1996 if (af >= AF_MAX) 1997 return (NULL); 1998 IF_ADDR_RLOCK(ifp); 1999 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2000 if (ifa->ifa_addr->sa_family != af) 2001 continue; 2002 if (ifa_maybe == NULL) 2003 ifa_maybe = ifa; 2004 if (ifa->ifa_netmask == 0) { 2005 if (sa_equal(addr, ifa->ifa_addr) || 2006 (ifa->ifa_dstaddr && 2007 sa_equal(addr, ifa->ifa_dstaddr))) 2008 goto done; 2009 continue; 2010 } 2011 if (ifp->if_flags & IFF_POINTOPOINT) { 2012 if (sa_equal(addr, ifa->ifa_dstaddr)) 2013 goto done; 2014 } else { 2015 cp = addr->sa_data; 2016 cp2 = ifa->ifa_addr->sa_data; 2017 cp3 = ifa->ifa_netmask->sa_data; 2018 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2019 for (; cp3 < cplim; cp3++) 2020 if ((*cp++ ^ *cp2++) & *cp3) 2021 break; 2022 if (cp3 == cplim) 2023 goto done; 2024 } 2025 } 2026 ifa = ifa_maybe; 2027done: 2028 if (ifa != NULL) 2029 ifa_ref(ifa); 2030 IF_ADDR_RUNLOCK(ifp); 2031 return (ifa); 2032} 2033 2034/* 2035 * See whether new ifa is better than current one: 2036 * 1) A non-virtual one is preferred over virtual. 2037 * 2) A virtual in master state preferred over any other state. 2038 * 2039 * Used in several address selecting functions. 2040 */ 2041int 2042ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2043{ 2044 2045 return (cur->ifa_carp && (!next->ifa_carp || 2046 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2047} 2048 2049#include <net/if_llatbl.h> 2050 2051/* 2052 * Default action when installing a route with a Link Level gateway. 2053 * Lookup an appropriate real ifa to point to. 2054 * This should be moved to /sys/net/link.c eventually. 2055 */ 2056static void 2057link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 2058{ 2059 struct ifaddr *ifa, *oifa; 2060 struct sockaddr *dst; 2061 struct ifnet *ifp; 2062 2063 RT_LOCK_ASSERT(rt); 2064 2065 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 2066 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 2067 return; 2068 ifa = ifaof_ifpforaddr(dst, ifp); 2069 if (ifa) { 2070 oifa = rt->rt_ifa; 2071 rt->rt_ifa = ifa; 2072 ifa_free(oifa); 2073 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2074 ifa->ifa_rtrequest(cmd, rt, info); 2075 } 2076} 2077 2078/* 2079 * Mark an interface down and notify protocols of 2080 * the transition. 2081 */ 2082static void 2083if_unroute(struct ifnet *ifp, int flag, int fam) 2084{ 2085 struct ifaddr *ifa; 2086 2087 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2088 2089 ifp->if_flags &= ~flag; 2090 getmicrotime(&ifp->if_lastchange); 2091 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2092 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2093 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2094 ifp->if_qflush(ifp); 2095 2096 if (ifp->if_carp) 2097 (*carp_linkstate_p)(ifp); 2098 rt_ifmsg(ifp); 2099} 2100 2101/* 2102 * Mark an interface up and notify protocols of 2103 * the transition. 2104 */ 2105static void 2106if_route(struct ifnet *ifp, int flag, int fam) 2107{ 2108 struct ifaddr *ifa; 2109 2110 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2111 2112 ifp->if_flags |= flag; 2113 getmicrotime(&ifp->if_lastchange); 2114 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2115 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2116 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2117 if (ifp->if_carp) 2118 (*carp_linkstate_p)(ifp); 2119 rt_ifmsg(ifp); 2120#ifdef INET6 2121 in6_if_up(ifp); 2122#endif 2123} 2124 2125void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2126void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2127struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2128struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2129int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2130int (*vlan_setcookie_p)(struct ifnet *, void *); 2131void *(*vlan_cookie_p)(struct ifnet *); 2132 2133/* 2134 * Handle a change in the interface link state. To avoid LORs 2135 * between driver lock and upper layer locks, as well as possible 2136 * recursions, we post event to taskqueue, and all job 2137 * is done in static do_link_state_change(). 2138 */ 2139void 2140if_link_state_change(struct ifnet *ifp, int link_state) 2141{ 2142 /* Return if state hasn't changed. */ 2143 if (ifp->if_link_state == link_state) 2144 return; 2145 2146 ifp->if_link_state = link_state; 2147 2148 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2149} 2150 2151static void 2152do_link_state_change(void *arg, int pending) 2153{ 2154 struct ifnet *ifp = (struct ifnet *)arg; 2155 int link_state = ifp->if_link_state; 2156 CURVNET_SET(ifp->if_vnet); 2157 2158 /* Notify that the link state has changed. */ 2159 rt_ifmsg(ifp); 2160 if (ifp->if_vlantrunk != NULL) 2161 (*vlan_link_state_p)(ifp); 2162 2163 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2164 IFP2AC(ifp)->ac_netgraph != NULL) 2165 (*ng_ether_link_state_p)(ifp, link_state); 2166 if (ifp->if_carp) 2167 (*carp_linkstate_p)(ifp); 2168 if (ifp->if_bridge) 2169 (*bridge_linkstate_p)(ifp); 2170 if (ifp->if_lagg) 2171 (*lagg_linkstate_p)(ifp, link_state); 2172 2173 if (IS_DEFAULT_VNET(curvnet)) 2174 devctl_notify("IFNET", ifp->if_xname, 2175 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2176 NULL); 2177 if (pending > 1) 2178 if_printf(ifp, "%d link states coalesced\n", pending); 2179 if (log_link_state_change) 2180 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 2181 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2182 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2183 CURVNET_RESTORE(); 2184} 2185 2186/* 2187 * Mark an interface down and notify protocols of 2188 * the transition. 2189 */ 2190void 2191if_down(struct ifnet *ifp) 2192{ 2193 2194 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2195 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2196} 2197 2198/* 2199 * Mark an interface up and notify protocols of 2200 * the transition. 2201 */ 2202void 2203if_up(struct ifnet *ifp) 2204{ 2205 2206 if_route(ifp, IFF_UP, AF_UNSPEC); 2207 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2208} 2209 2210/* 2211 * Flush an interface queue. 2212 */ 2213void 2214if_qflush(struct ifnet *ifp) 2215{ 2216 struct mbuf *m, *n; 2217 struct ifaltq *ifq; 2218 2219 ifq = &ifp->if_snd; 2220 IFQ_LOCK(ifq); 2221#ifdef ALTQ 2222 if (ALTQ_IS_ENABLED(ifq)) 2223 ALTQ_PURGE(ifq); 2224#endif 2225 n = ifq->ifq_head; 2226 while ((m = n) != 0) { 2227 n = m->m_nextpkt; 2228 m_freem(m); 2229 } 2230 ifq->ifq_head = 0; 2231 ifq->ifq_tail = 0; 2232 ifq->ifq_len = 0; 2233 IFQ_UNLOCK(ifq); 2234} 2235 2236/* 2237 * Map interface name to interface structure pointer, with or without 2238 * returning a reference. 2239 */ 2240struct ifnet * 2241ifunit_ref(const char *name) 2242{ 2243 struct ifnet *ifp; 2244 2245 IFNET_RLOCK_NOSLEEP(); 2246 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2247 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2248 !(ifp->if_flags & IFF_DYING)) 2249 break; 2250 } 2251 if (ifp != NULL) 2252 if_ref(ifp); 2253 IFNET_RUNLOCK_NOSLEEP(); 2254 return (ifp); 2255} 2256 2257struct ifnet * 2258ifunit(const char *name) 2259{ 2260 struct ifnet *ifp; 2261 2262 IFNET_RLOCK_NOSLEEP(); 2263 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2264 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2265 break; 2266 } 2267 IFNET_RUNLOCK_NOSLEEP(); 2268 return (ifp); 2269} 2270 2271/* 2272 * Hardware specific interface ioctls. 2273 */ 2274static int 2275ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2276{ 2277 struct ifreq *ifr; 2278 struct ifstat *ifs; 2279 int error = 0, do_ifup = 0; 2280 int new_flags, temp_flags; 2281 size_t namelen, onamelen; 2282 size_t descrlen; 2283 char *descrbuf, *odescrbuf; 2284 char new_name[IFNAMSIZ]; 2285 struct ifaddr *ifa; 2286 struct sockaddr_dl *sdl; 2287 2288 ifr = (struct ifreq *)data; 2289 switch (cmd) { 2290 case SIOCGIFINDEX: 2291 ifr->ifr_index = ifp->if_index; 2292 break; 2293 2294 case SIOCGIFFLAGS: 2295 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2296 ifr->ifr_flags = temp_flags & 0xffff; 2297 ifr->ifr_flagshigh = temp_flags >> 16; 2298 break; 2299 2300 case SIOCGIFCAP: 2301 ifr->ifr_reqcap = ifp->if_capabilities; 2302 ifr->ifr_curcap = ifp->if_capenable; 2303 break; 2304 2305#ifdef MAC 2306 case SIOCGIFMAC: 2307 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2308 break; 2309#endif 2310 2311 case SIOCGIFMETRIC: 2312 ifr->ifr_metric = ifp->if_metric; 2313 break; 2314 2315 case SIOCGIFMTU: 2316 ifr->ifr_mtu = ifp->if_mtu; 2317 break; 2318 2319 case SIOCGIFPHYS: 2320 ifr->ifr_phys = ifp->if_physical; 2321 break; 2322 2323 case SIOCGIFDESCR: 2324 error = 0; 2325 sx_slock(&ifdescr_sx); 2326 if (ifp->if_description == NULL) 2327 error = ENOMSG; 2328 else { 2329 /* space for terminating nul */ 2330 descrlen = strlen(ifp->if_description) + 1; 2331 if (ifr->ifr_buffer.length < descrlen) 2332 ifr->ifr_buffer.buffer = NULL; 2333 else 2334 error = copyout(ifp->if_description, 2335 ifr->ifr_buffer.buffer, descrlen); 2336 ifr->ifr_buffer.length = descrlen; 2337 } 2338 sx_sunlock(&ifdescr_sx); 2339 break; 2340 2341 case SIOCSIFDESCR: 2342 error = priv_check(td, PRIV_NET_SETIFDESCR); 2343 if (error) 2344 return (error); 2345 2346 /* 2347 * Copy only (length-1) bytes to make sure that 2348 * if_description is always nul terminated. The 2349 * length parameter is supposed to count the 2350 * terminating nul in. 2351 */ 2352 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2353 return (ENAMETOOLONG); 2354 else if (ifr->ifr_buffer.length == 0) 2355 descrbuf = NULL; 2356 else { 2357 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2358 M_WAITOK | M_ZERO); 2359 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2360 ifr->ifr_buffer.length - 1); 2361 if (error) { 2362 free(descrbuf, M_IFDESCR); 2363 break; 2364 } 2365 } 2366 2367 sx_xlock(&ifdescr_sx); 2368 odescrbuf = ifp->if_description; 2369 ifp->if_description = descrbuf; 2370 sx_xunlock(&ifdescr_sx); 2371 2372 getmicrotime(&ifp->if_lastchange); 2373 free(odescrbuf, M_IFDESCR); 2374 break; 2375 2376 case SIOCGIFFIB: 2377 ifr->ifr_fib = ifp->if_fib; 2378 break; 2379 2380 case SIOCSIFFIB: 2381 error = priv_check(td, PRIV_NET_SETIFFIB); 2382 if (error) 2383 return (error); 2384 if (ifr->ifr_fib >= rt_numfibs) 2385 return (EINVAL); 2386 2387 ifp->if_fib = ifr->ifr_fib; 2388 break; 2389 2390 case SIOCSIFFLAGS: 2391 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2392 if (error) 2393 return (error); 2394 /* 2395 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2396 * check, so we don't need special handling here yet. 2397 */ 2398 new_flags = (ifr->ifr_flags & 0xffff) | 2399 (ifr->ifr_flagshigh << 16); 2400 if (ifp->if_flags & IFF_SMART) { 2401 /* Smart drivers twiddle their own routes */ 2402 } else if (ifp->if_flags & IFF_UP && 2403 (new_flags & IFF_UP) == 0) { 2404 if_down(ifp); 2405 } else if (new_flags & IFF_UP && 2406 (ifp->if_flags & IFF_UP) == 0) { 2407 do_ifup = 1; 2408 } 2409 /* See if permanently promiscuous mode bit is about to flip */ 2410 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2411 if (new_flags & IFF_PPROMISC) 2412 ifp->if_flags |= IFF_PROMISC; 2413 else if (ifp->if_pcount == 0) 2414 ifp->if_flags &= ~IFF_PROMISC; 2415 if (log_promisc_mode_change) 2416 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2417 ifp->if_xname, 2418 ((new_flags & IFF_PPROMISC) ? 2419 "enabled" : "disabled")); 2420 } 2421 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2422 (new_flags &~ IFF_CANTCHANGE); 2423 if (ifp->if_ioctl) { 2424 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2425 } 2426 if (do_ifup) 2427 if_up(ifp); 2428 getmicrotime(&ifp->if_lastchange); 2429 break; 2430 2431 case SIOCSIFCAP: 2432 error = priv_check(td, PRIV_NET_SETIFCAP); 2433 if (error) 2434 return (error); 2435 if (ifp->if_ioctl == NULL) 2436 return (EOPNOTSUPP); 2437 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2438 return (EINVAL); 2439 error = (*ifp->if_ioctl)(ifp, cmd, data); 2440 if (error == 0) 2441 getmicrotime(&ifp->if_lastchange); 2442 break; 2443 2444#ifdef MAC 2445 case SIOCSIFMAC: 2446 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2447 break; 2448#endif 2449 2450 case SIOCSIFNAME: 2451 error = priv_check(td, PRIV_NET_SETIFNAME); 2452 if (error) 2453 return (error); 2454 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2455 if (error != 0) 2456 return (error); 2457 if (new_name[0] == '\0') 2458 return (EINVAL); 2459 if (new_name[IFNAMSIZ-1] != '\0') { 2460 new_name[IFNAMSIZ-1] = '\0'; 2461 if (strlen(new_name) == IFNAMSIZ-1) 2462 return (EINVAL); 2463 } 2464 if (ifunit(new_name) != NULL) 2465 return (EEXIST); 2466 2467 /* 2468 * XXX: Locking. Nothing else seems to lock if_flags, 2469 * and there are numerous other races with the 2470 * ifunit() checks not being atomic with namespace 2471 * changes (renames, vmoves, if_attach, etc). 2472 */ 2473 ifp->if_flags |= IFF_RENAMING; 2474 2475 /* Announce the departure of the interface. */ 2476 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2477 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2478 2479 log(LOG_INFO, "%s: changing name to '%s'\n", 2480 ifp->if_xname, new_name); 2481 2482 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2483 ifa = ifp->if_addr; 2484 IFA_LOCK(ifa); 2485 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2486 namelen = strlen(new_name); 2487 onamelen = sdl->sdl_nlen; 2488 /* 2489 * Move the address if needed. This is safe because we 2490 * allocate space for a name of length IFNAMSIZ when we 2491 * create this in if_attach(). 2492 */ 2493 if (namelen != onamelen) { 2494 bcopy(sdl->sdl_data + onamelen, 2495 sdl->sdl_data + namelen, sdl->sdl_alen); 2496 } 2497 bcopy(new_name, sdl->sdl_data, namelen); 2498 sdl->sdl_nlen = namelen; 2499 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2500 bzero(sdl->sdl_data, onamelen); 2501 while (namelen != 0) 2502 sdl->sdl_data[--namelen] = 0xff; 2503 IFA_UNLOCK(ifa); 2504 2505 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2506 /* Announce the return of the interface. */ 2507 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2508 2509 ifp->if_flags &= ~IFF_RENAMING; 2510 break; 2511 2512#ifdef VIMAGE 2513 case SIOCSIFVNET: 2514 error = priv_check(td, PRIV_NET_SETIFVNET); 2515 if (error) 2516 return (error); 2517 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2518 break; 2519#endif 2520 2521 case SIOCSIFMETRIC: 2522 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2523 if (error) 2524 return (error); 2525 ifp->if_metric = ifr->ifr_metric; 2526 getmicrotime(&ifp->if_lastchange); 2527 break; 2528 2529 case SIOCSIFPHYS: 2530 error = priv_check(td, PRIV_NET_SETIFPHYS); 2531 if (error) 2532 return (error); 2533 if (ifp->if_ioctl == NULL) 2534 return (EOPNOTSUPP); 2535 error = (*ifp->if_ioctl)(ifp, cmd, data); 2536 if (error == 0) 2537 getmicrotime(&ifp->if_lastchange); 2538 break; 2539 2540 case SIOCSIFMTU: 2541 { 2542 u_long oldmtu = ifp->if_mtu; 2543 2544 error = priv_check(td, PRIV_NET_SETIFMTU); 2545 if (error) 2546 return (error); 2547 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2548 return (EINVAL); 2549 if (ifp->if_ioctl == NULL) 2550 return (EOPNOTSUPP); 2551 error = (*ifp->if_ioctl)(ifp, cmd, data); 2552 if (error == 0) { 2553 getmicrotime(&ifp->if_lastchange); 2554 rt_ifmsg(ifp); 2555 } 2556 /* 2557 * If the link MTU changed, do network layer specific procedure. 2558 */ 2559 if (ifp->if_mtu != oldmtu) { 2560#ifdef INET6 2561 nd6_setmtu(ifp); 2562#endif 2563 } 2564 break; 2565 } 2566 2567 case SIOCADDMULTI: 2568 case SIOCDELMULTI: 2569 if (cmd == SIOCADDMULTI) 2570 error = priv_check(td, PRIV_NET_ADDMULTI); 2571 else 2572 error = priv_check(td, PRIV_NET_DELMULTI); 2573 if (error) 2574 return (error); 2575 2576 /* Don't allow group membership on non-multicast interfaces. */ 2577 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2578 return (EOPNOTSUPP); 2579 2580 /* Don't let users screw up protocols' entries. */ 2581 if (ifr->ifr_addr.sa_family != AF_LINK) 2582 return (EINVAL); 2583 2584 if (cmd == SIOCADDMULTI) { 2585 struct ifmultiaddr *ifma; 2586 2587 /* 2588 * Userland is only permitted to join groups once 2589 * via the if_addmulti() KPI, because it cannot hold 2590 * struct ifmultiaddr * between calls. It may also 2591 * lose a race while we check if the membership 2592 * already exists. 2593 */ 2594 IF_ADDR_RLOCK(ifp); 2595 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2596 IF_ADDR_RUNLOCK(ifp); 2597 if (ifma != NULL) 2598 error = EADDRINUSE; 2599 else 2600 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2601 } else { 2602 error = if_delmulti(ifp, &ifr->ifr_addr); 2603 } 2604 if (error == 0) 2605 getmicrotime(&ifp->if_lastchange); 2606 break; 2607 2608 case SIOCSIFPHYADDR: 2609 case SIOCDIFPHYADDR: 2610#ifdef INET6 2611 case SIOCSIFPHYADDR_IN6: 2612#endif 2613 case SIOCSLIFPHYADDR: 2614 case SIOCSIFMEDIA: 2615 case SIOCSIFGENERIC: 2616 error = priv_check(td, PRIV_NET_HWIOCTL); 2617 if (error) 2618 return (error); 2619 if (ifp->if_ioctl == NULL) 2620 return (EOPNOTSUPP); 2621 error = (*ifp->if_ioctl)(ifp, cmd, data); 2622 if (error == 0) 2623 getmicrotime(&ifp->if_lastchange); 2624 break; 2625 2626 case SIOCGIFSTATUS: 2627 ifs = (struct ifstat *)data; 2628 ifs->ascii[0] = '\0'; 2629 2630 case SIOCGIFPSRCADDR: 2631 case SIOCGIFPDSTADDR: 2632 case SIOCGLIFPHYADDR: 2633 case SIOCGIFMEDIA: 2634 case SIOCGIFXMEDIA: 2635 case SIOCGIFGENERIC: 2636 case SIOCGIFRSSKEY: 2637 case SIOCGIFRSSHASH: 2638 if (ifp->if_ioctl == NULL) 2639 return (EOPNOTSUPP); 2640 error = (*ifp->if_ioctl)(ifp, cmd, data); 2641 break; 2642 2643 case SIOCSIFLLADDR: 2644 error = priv_check(td, PRIV_NET_SETLLADDR); 2645 if (error) 2646 return (error); 2647 error = if_setlladdr(ifp, 2648 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2649 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2650 break; 2651 2652 case SIOCGHWADDR: 2653 error = if_gethwaddr(ifp, ifr); 2654 break; 2655 2656 case SIOCAIFGROUP: 2657 { 2658 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2659 2660 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2661 if (error) 2662 return (error); 2663 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2664 return (error); 2665 break; 2666 } 2667 2668 case SIOCGIFGROUP: 2669 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2670 return (error); 2671 break; 2672 2673 case SIOCDIFGROUP: 2674 { 2675 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2676 2677 error = priv_check(td, PRIV_NET_DELIFGROUP); 2678 if (error) 2679 return (error); 2680 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2681 return (error); 2682 break; 2683 } 2684 2685 default: 2686 error = ENOIOCTL; 2687 break; 2688 } 2689 return (error); 2690} 2691 2692#ifdef COMPAT_FREEBSD32 2693struct ifconf32 { 2694 int32_t ifc_len; 2695 union { 2696 uint32_t ifcu_buf; 2697 uint32_t ifcu_req; 2698 } ifc_ifcu; 2699}; 2700#define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2701#endif 2702 2703/* 2704 * Interface ioctls. 2705 */ 2706int 2707ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2708{ 2709 struct ifnet *ifp; 2710 struct ifreq *ifr; 2711 int error; 2712 int oif_flags; 2713 2714 CURVNET_SET(so->so_vnet); 2715 switch (cmd) { 2716 case SIOCGIFCONF: 2717 case OSIOCGIFCONF: 2718 error = ifconf(cmd, data); 2719 CURVNET_RESTORE(); 2720 return (error); 2721 2722#ifdef COMPAT_FREEBSD32 2723 case SIOCGIFCONF32: 2724 { 2725 struct ifconf32 *ifc32; 2726 struct ifconf ifc; 2727 2728 ifc32 = (struct ifconf32 *)data; 2729 ifc.ifc_len = ifc32->ifc_len; 2730 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2731 2732 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2733 CURVNET_RESTORE(); 2734 if (error == 0) 2735 ifc32->ifc_len = ifc.ifc_len; 2736 return (error); 2737 } 2738#endif 2739 } 2740 ifr = (struct ifreq *)data; 2741 2742 switch (cmd) { 2743#ifdef VIMAGE 2744 case SIOCSIFRVNET: 2745 error = priv_check(td, PRIV_NET_SETIFVNET); 2746 if (error == 0) 2747 error = if_vmove_reclaim(td, ifr->ifr_name, 2748 ifr->ifr_jid); 2749 CURVNET_RESTORE(); 2750 return (error); 2751#endif 2752 case SIOCIFCREATE: 2753 case SIOCIFCREATE2: 2754 error = priv_check(td, PRIV_NET_IFCREATE); 2755 if (error == 0) 2756 error = if_clone_create(ifr->ifr_name, 2757 sizeof(ifr->ifr_name), 2758 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2759 CURVNET_RESTORE(); 2760 return (error); 2761 case SIOCIFDESTROY: 2762 error = priv_check(td, PRIV_NET_IFDESTROY); 2763 if (error == 0) 2764 error = if_clone_destroy(ifr->ifr_name); 2765 CURVNET_RESTORE(); 2766 return (error); 2767 2768 case SIOCIFGCLONERS: 2769 error = if_clone_list((struct if_clonereq *)data); 2770 CURVNET_RESTORE(); 2771 return (error); 2772 case SIOCGIFGMEMB: 2773 error = if_getgroupmembers((struct ifgroupreq *)data); 2774 CURVNET_RESTORE(); 2775 return (error); 2776#if defined(INET) || defined(INET6) 2777 case SIOCSVH: 2778 case SIOCGVH: 2779 if (carp_ioctl_p == NULL) 2780 error = EPROTONOSUPPORT; 2781 else 2782 error = (*carp_ioctl_p)(ifr, cmd, td); 2783 CURVNET_RESTORE(); 2784 return (error); 2785#endif 2786 } 2787 2788 ifp = ifunit_ref(ifr->ifr_name); 2789 if (ifp == NULL) { 2790 CURVNET_RESTORE(); 2791 return (ENXIO); 2792 } 2793 2794 error = ifhwioctl(cmd, ifp, data, td); 2795 if (error != ENOIOCTL) { 2796 if_rele(ifp); 2797 CURVNET_RESTORE(); 2798 return (error); 2799 } 2800 2801 oif_flags = ifp->if_flags; 2802 if (so->so_proto == NULL) { 2803 if_rele(ifp); 2804 CURVNET_RESTORE(); 2805 return (EOPNOTSUPP); 2806 } 2807 2808 /* 2809 * Pass the request on to the socket control method, and if the 2810 * latter returns EOPNOTSUPP, directly to the interface. 2811 * 2812 * Make an exception for the legacy SIOCSIF* requests. Drivers 2813 * trust SIOCSIFADDR et al to come from an already privileged 2814 * layer, and do not perform any credentials checks or input 2815 * validation. 2816 */ 2817#ifndef COMPAT_43 2818 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2819 data, 2820 ifp, td)); 2821 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2822 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2823 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2824 error = (*ifp->if_ioctl)(ifp, cmd, data); 2825#else 2826 { 2827 u_long ocmd = cmd; 2828 2829 switch (cmd) { 2830 2831 case SIOCSIFDSTADDR: 2832 case SIOCSIFADDR: 2833 case SIOCSIFBRDADDR: 2834 case SIOCSIFNETMASK: 2835#if BYTE_ORDER != BIG_ENDIAN 2836 if (ifr->ifr_addr.sa_family == 0 && 2837 ifr->ifr_addr.sa_len < 16) { 2838 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2839 ifr->ifr_addr.sa_len = 16; 2840 } 2841#else 2842 if (ifr->ifr_addr.sa_len == 0) 2843 ifr->ifr_addr.sa_len = 16; 2844#endif 2845 break; 2846 2847 case OSIOCGIFADDR: 2848 cmd = SIOCGIFADDR; 2849 break; 2850 2851 case OSIOCGIFDSTADDR: 2852 cmd = SIOCGIFDSTADDR; 2853 break; 2854 2855 case OSIOCGIFBRDADDR: 2856 cmd = SIOCGIFBRDADDR; 2857 break; 2858 2859 case OSIOCGIFNETMASK: 2860 cmd = SIOCGIFNETMASK; 2861 } 2862 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2863 cmd, 2864 data, 2865 ifp, td)); 2866 if (error == EOPNOTSUPP && ifp != NULL && 2867 ifp->if_ioctl != NULL && 2868 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2869 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2870 error = (*ifp->if_ioctl)(ifp, cmd, data); 2871 switch (ocmd) { 2872 2873 case OSIOCGIFADDR: 2874 case OSIOCGIFDSTADDR: 2875 case OSIOCGIFBRDADDR: 2876 case OSIOCGIFNETMASK: 2877 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2878 2879 } 2880 } 2881#endif /* COMPAT_43 */ 2882 2883 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2884#ifdef INET6 2885 if (ifp->if_flags & IFF_UP) 2886 in6_if_up(ifp); 2887#endif 2888 } 2889 if_rele(ifp); 2890 CURVNET_RESTORE(); 2891 return (error); 2892} 2893 2894/* 2895 * The code common to handling reference counted flags, 2896 * e.g., in ifpromisc() and if_allmulti(). 2897 * The "pflag" argument can specify a permanent mode flag to check, 2898 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2899 * 2900 * Only to be used on stack-owned flags, not driver-owned flags. 2901 */ 2902static int 2903if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2904{ 2905 struct ifreq ifr; 2906 int error; 2907 int oldflags, oldcount; 2908 2909 /* Sanity checks to catch programming errors */ 2910 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2911 ("%s: setting driver-owned flag %d", __func__, flag)); 2912 2913 if (onswitch) 2914 KASSERT(*refcount >= 0, 2915 ("%s: increment negative refcount %d for flag %d", 2916 __func__, *refcount, flag)); 2917 else 2918 KASSERT(*refcount > 0, 2919 ("%s: decrement non-positive refcount %d for flag %d", 2920 __func__, *refcount, flag)); 2921 2922 /* In case this mode is permanent, just touch refcount */ 2923 if (ifp->if_flags & pflag) { 2924 *refcount += onswitch ? 1 : -1; 2925 return (0); 2926 } 2927 2928 /* Save ifnet parameters for if_ioctl() may fail */ 2929 oldcount = *refcount; 2930 oldflags = ifp->if_flags; 2931 2932 /* 2933 * See if we aren't the only and touching refcount is enough. 2934 * Actually toggle interface flag if we are the first or last. 2935 */ 2936 if (onswitch) { 2937 if ((*refcount)++) 2938 return (0); 2939 ifp->if_flags |= flag; 2940 } else { 2941 if (--(*refcount)) 2942 return (0); 2943 ifp->if_flags &= ~flag; 2944 } 2945 2946 /* Call down the driver since we've changed interface flags */ 2947 if (ifp->if_ioctl == NULL) { 2948 error = EOPNOTSUPP; 2949 goto recover; 2950 } 2951 ifr.ifr_flags = ifp->if_flags & 0xffff; 2952 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2953 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2954 if (error) 2955 goto recover; 2956 /* Notify userland that interface flags have changed */ 2957 rt_ifmsg(ifp); 2958 return (0); 2959 2960recover: 2961 /* Recover after driver error */ 2962 *refcount = oldcount; 2963 ifp->if_flags = oldflags; 2964 return (error); 2965} 2966 2967/* 2968 * Set/clear promiscuous mode on interface ifp based on the truth value 2969 * of pswitch. The calls are reference counted so that only the first 2970 * "on" request actually has an effect, as does the final "off" request. 2971 * Results are undefined if the "off" and "on" requests are not matched. 2972 */ 2973int 2974ifpromisc(struct ifnet *ifp, int pswitch) 2975{ 2976 int error; 2977 int oldflags = ifp->if_flags; 2978 2979 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2980 &ifp->if_pcount, pswitch); 2981 /* If promiscuous mode status has changed, log a message */ 2982 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 2983 log_promisc_mode_change) 2984 log(LOG_INFO, "%s: promiscuous mode %s\n", 2985 ifp->if_xname, 2986 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2987 return (error); 2988} 2989 2990/* 2991 * Return interface configuration 2992 * of system. List may be used 2993 * in later ioctl's (above) to get 2994 * other information. 2995 */ 2996/*ARGSUSED*/ 2997static int 2998ifconf(u_long cmd, caddr_t data) 2999{ 3000 struct ifconf *ifc = (struct ifconf *)data; 3001 struct ifnet *ifp; 3002 struct ifaddr *ifa; 3003 struct ifreq ifr; 3004 struct sbuf *sb; 3005 int error, full = 0, valid_len, max_len; 3006 3007 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3008 max_len = MAXPHYS - 1; 3009 3010 /* Prevent hostile input from being able to crash the system */ 3011 if (ifc->ifc_len <= 0) 3012 return (EINVAL); 3013 3014again: 3015 if (ifc->ifc_len <= max_len) { 3016 max_len = ifc->ifc_len; 3017 full = 1; 3018 } 3019 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3020 max_len = 0; 3021 valid_len = 0; 3022 3023 IFNET_RLOCK(); 3024 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3025 int addrs; 3026 3027 /* 3028 * Zero the ifr to make sure we don't disclose the contents 3029 * of the stack. 3030 */ 3031 memset(&ifr, 0, sizeof(ifr)); 3032 3033 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3034 >= sizeof(ifr.ifr_name)) { 3035 sbuf_delete(sb); 3036 IFNET_RUNLOCK(); 3037 return (ENAMETOOLONG); 3038 } 3039 3040 addrs = 0; 3041 IF_ADDR_RLOCK(ifp); 3042 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3043 struct sockaddr *sa = ifa->ifa_addr; 3044 3045 if (prison_if(curthread->td_ucred, sa) != 0) 3046 continue; 3047 addrs++; 3048#ifdef COMPAT_43 3049 if (cmd == OSIOCGIFCONF) { 3050 struct osockaddr *osa = 3051 (struct osockaddr *)&ifr.ifr_addr; 3052 ifr.ifr_addr = *sa; 3053 osa->sa_family = sa->sa_family; 3054 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3055 max_len += sizeof(ifr); 3056 } else 3057#endif 3058 if (sa->sa_len <= sizeof(*sa)) { 3059 if (sa->sa_len < sizeof(*sa)) { 3060 memset(&ifr.ifr_ifru.ifru_addr, 0, 3061 sizeof(ifr.ifr_ifru.ifru_addr)); 3062 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3063 sa->sa_len); 3064 } else 3065 ifr.ifr_ifru.ifru_addr = *sa; 3066 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3067 max_len += sizeof(ifr); 3068 } else { 3069 sbuf_bcat(sb, &ifr, 3070 offsetof(struct ifreq, ifr_addr)); 3071 max_len += offsetof(struct ifreq, ifr_addr); 3072 sbuf_bcat(sb, sa, sa->sa_len); 3073 max_len += sa->sa_len; 3074 } 3075 3076 if (sbuf_error(sb) == 0) 3077 valid_len = sbuf_len(sb); 3078 } 3079 IF_ADDR_RUNLOCK(ifp); 3080 if (addrs == 0) { 3081 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3082 max_len += sizeof(ifr); 3083 3084 if (sbuf_error(sb) == 0) 3085 valid_len = sbuf_len(sb); 3086 } 3087 } 3088 IFNET_RUNLOCK(); 3089 3090 /* 3091 * If we didn't allocate enough space (uncommon), try again. If 3092 * we have already allocated as much space as we are allowed, 3093 * return what we've got. 3094 */ 3095 if (valid_len != max_len && !full) { 3096 sbuf_delete(sb); 3097 goto again; 3098 } 3099 3100 ifc->ifc_len = valid_len; 3101 sbuf_finish(sb); 3102 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3103 sbuf_delete(sb); 3104 return (error); 3105} 3106 3107/* 3108 * Just like ifpromisc(), but for all-multicast-reception mode. 3109 */ 3110int 3111if_allmulti(struct ifnet *ifp, int onswitch) 3112{ 3113 3114 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3115} 3116 3117struct ifmultiaddr * 3118if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 3119{ 3120 struct ifmultiaddr *ifma; 3121 3122 IF_ADDR_LOCK_ASSERT(ifp); 3123 3124 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3125 if (sa->sa_family == AF_LINK) { 3126 if (sa_dl_equal(ifma->ifma_addr, sa)) 3127 break; 3128 } else { 3129 if (sa_equal(ifma->ifma_addr, sa)) 3130 break; 3131 } 3132 } 3133 3134 return ifma; 3135} 3136 3137/* 3138 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3139 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3140 * the ifnet multicast address list here, so the caller must do that and 3141 * other setup work (such as notifying the device driver). The reference 3142 * count is initialized to 1. 3143 */ 3144static struct ifmultiaddr * 3145if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3146 int mflags) 3147{ 3148 struct ifmultiaddr *ifma; 3149 struct sockaddr *dupsa; 3150 3151 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3152 M_ZERO); 3153 if (ifma == NULL) 3154 return (NULL); 3155 3156 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3157 if (dupsa == NULL) { 3158 free(ifma, M_IFMADDR); 3159 return (NULL); 3160 } 3161 bcopy(sa, dupsa, sa->sa_len); 3162 ifma->ifma_addr = dupsa; 3163 3164 ifma->ifma_ifp = ifp; 3165 ifma->ifma_refcount = 1; 3166 ifma->ifma_protospec = NULL; 3167 3168 if (llsa == NULL) { 3169 ifma->ifma_lladdr = NULL; 3170 return (ifma); 3171 } 3172 3173 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3174 if (dupsa == NULL) { 3175 free(ifma->ifma_addr, M_IFMADDR); 3176 free(ifma, M_IFMADDR); 3177 return (NULL); 3178 } 3179 bcopy(llsa, dupsa, llsa->sa_len); 3180 ifma->ifma_lladdr = dupsa; 3181 3182 return (ifma); 3183} 3184 3185/* 3186 * if_freemulti: free ifmultiaddr structure and possibly attached related 3187 * addresses. The caller is responsible for implementing reference 3188 * counting, notifying the driver, handling routing messages, and releasing 3189 * any dependent link layer state. 3190 */ 3191static void 3192if_freemulti(struct ifmultiaddr *ifma) 3193{ 3194 3195 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3196 ifma->ifma_refcount)); 3197 KASSERT(ifma->ifma_protospec == NULL, 3198 ("if_freemulti: protospec not NULL")); 3199 3200 if (ifma->ifma_lladdr != NULL) 3201 free(ifma->ifma_lladdr, M_IFMADDR); 3202 free(ifma->ifma_addr, M_IFMADDR); 3203 free(ifma, M_IFMADDR); 3204} 3205 3206/* 3207 * Register an additional multicast address with a network interface. 3208 * 3209 * - If the address is already present, bump the reference count on the 3210 * address and return. 3211 * - If the address is not link-layer, look up a link layer address. 3212 * - Allocate address structures for one or both addresses, and attach to the 3213 * multicast address list on the interface. If automatically adding a link 3214 * layer address, the protocol address will own a reference to the link 3215 * layer address, to be freed when it is freed. 3216 * - Notify the network device driver of an addition to the multicast address 3217 * list. 3218 * 3219 * 'sa' points to caller-owned memory with the desired multicast address. 3220 * 3221 * 'retifma' will be used to return a pointer to the resulting multicast 3222 * address reference, if desired. 3223 */ 3224int 3225if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3226 struct ifmultiaddr **retifma) 3227{ 3228 struct ifmultiaddr *ifma, *ll_ifma; 3229 struct sockaddr *llsa; 3230 int error; 3231 3232 /* 3233 * If the address is already present, return a new reference to it; 3234 * otherwise, allocate storage and set up a new address. 3235 */ 3236 IF_ADDR_WLOCK(ifp); 3237 ifma = if_findmulti(ifp, sa); 3238 if (ifma != NULL) { 3239 ifma->ifma_refcount++; 3240 if (retifma != NULL) 3241 *retifma = ifma; 3242 IF_ADDR_WUNLOCK(ifp); 3243 return (0); 3244 } 3245 3246 /* 3247 * The address isn't already present; resolve the protocol address 3248 * into a link layer address, and then look that up, bump its 3249 * refcount or allocate an ifma for that also. If 'llsa' was 3250 * returned, we will need to free it later. 3251 */ 3252 llsa = NULL; 3253 ll_ifma = NULL; 3254 if (ifp->if_resolvemulti != NULL) { 3255 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3256 if (error) 3257 goto unlock_out; 3258 } 3259 3260 /* 3261 * Allocate the new address. Don't hook it up yet, as we may also 3262 * need to allocate a link layer multicast address. 3263 */ 3264 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3265 if (ifma == NULL) { 3266 error = ENOMEM; 3267 goto free_llsa_out; 3268 } 3269 3270 /* 3271 * If a link layer address is found, we'll need to see if it's 3272 * already present in the address list, or allocate is as well. 3273 * When this block finishes, the link layer address will be on the 3274 * list. 3275 */ 3276 if (llsa != NULL) { 3277 ll_ifma = if_findmulti(ifp, llsa); 3278 if (ll_ifma == NULL) { 3279 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3280 if (ll_ifma == NULL) { 3281 --ifma->ifma_refcount; 3282 if_freemulti(ifma); 3283 error = ENOMEM; 3284 goto free_llsa_out; 3285 } 3286 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3287 ifma_link); 3288 } else 3289 ll_ifma->ifma_refcount++; 3290 ifma->ifma_llifma = ll_ifma; 3291 } 3292 3293 /* 3294 * We now have a new multicast address, ifma, and possibly a new or 3295 * referenced link layer address. Add the primary address to the 3296 * ifnet address list. 3297 */ 3298 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3299 3300 if (retifma != NULL) 3301 *retifma = ifma; 3302 3303 /* 3304 * Must generate the message while holding the lock so that 'ifma' 3305 * pointer is still valid. 3306 */ 3307 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3308 IF_ADDR_WUNLOCK(ifp); 3309 3310 /* 3311 * We are certain we have added something, so call down to the 3312 * interface to let them know about it. 3313 */ 3314 if (ifp->if_ioctl != NULL) { 3315 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3316 } 3317 3318 if (llsa != NULL) 3319 free(llsa, M_IFMADDR); 3320 3321 return (0); 3322 3323free_llsa_out: 3324 if (llsa != NULL) 3325 free(llsa, M_IFMADDR); 3326 3327unlock_out: 3328 IF_ADDR_WUNLOCK(ifp); 3329 return (error); 3330} 3331 3332/* 3333 * Delete a multicast group membership by network-layer group address. 3334 * 3335 * Returns ENOENT if the entry could not be found. If ifp no longer 3336 * exists, results are undefined. This entry point should only be used 3337 * from subsystems which do appropriate locking to hold ifp for the 3338 * duration of the call. 3339 * Network-layer protocol domains must use if_delmulti_ifma(). 3340 */ 3341int 3342if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3343{ 3344 struct ifmultiaddr *ifma; 3345 int lastref; 3346#ifdef INVARIANTS 3347 struct ifnet *oifp; 3348 3349 IFNET_RLOCK_NOSLEEP(); 3350 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3351 if (ifp == oifp) 3352 break; 3353 if (ifp != oifp) 3354 ifp = NULL; 3355 IFNET_RUNLOCK_NOSLEEP(); 3356 3357 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3358#endif 3359 if (ifp == NULL) 3360 return (ENOENT); 3361 3362 IF_ADDR_WLOCK(ifp); 3363 lastref = 0; 3364 ifma = if_findmulti(ifp, sa); 3365 if (ifma != NULL) 3366 lastref = if_delmulti_locked(ifp, ifma, 0); 3367 IF_ADDR_WUNLOCK(ifp); 3368 3369 if (ifma == NULL) 3370 return (ENOENT); 3371 3372 if (lastref && ifp->if_ioctl != NULL) { 3373 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3374 } 3375 3376 return (0); 3377} 3378 3379/* 3380 * Delete all multicast group membership for an interface. 3381 * Should be used to quickly flush all multicast filters. 3382 */ 3383void 3384if_delallmulti(struct ifnet *ifp) 3385{ 3386 struct ifmultiaddr *ifma; 3387 struct ifmultiaddr *next; 3388 3389 IF_ADDR_WLOCK(ifp); 3390 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3391 if_delmulti_locked(ifp, ifma, 0); 3392 IF_ADDR_WUNLOCK(ifp); 3393} 3394 3395/* 3396 * Delete a multicast group membership by group membership pointer. 3397 * Network-layer protocol domains must use this routine. 3398 * 3399 * It is safe to call this routine if the ifp disappeared. 3400 */ 3401void 3402if_delmulti_ifma(struct ifmultiaddr *ifma) 3403{ 3404 struct ifnet *ifp; 3405 int lastref; 3406 3407 ifp = ifma->ifma_ifp; 3408#ifdef DIAGNOSTIC 3409 if (ifp == NULL) { 3410 printf("%s: ifma_ifp seems to be detached\n", __func__); 3411 } else { 3412 struct ifnet *oifp; 3413 3414 IFNET_RLOCK_NOSLEEP(); 3415 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3416 if (ifp == oifp) 3417 break; 3418 if (ifp != oifp) { 3419 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3420 ifp = NULL; 3421 } 3422 IFNET_RUNLOCK_NOSLEEP(); 3423 } 3424#endif 3425 /* 3426 * If and only if the ifnet instance exists: Acquire the address lock. 3427 */ 3428 if (ifp != NULL) 3429 IF_ADDR_WLOCK(ifp); 3430 3431 lastref = if_delmulti_locked(ifp, ifma, 0); 3432 3433 if (ifp != NULL) { 3434 /* 3435 * If and only if the ifnet instance exists: 3436 * Release the address lock. 3437 * If the group was left: update the hardware hash filter. 3438 */ 3439 IF_ADDR_WUNLOCK(ifp); 3440 if (lastref && ifp->if_ioctl != NULL) { 3441 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3442 } 3443 } 3444} 3445 3446/* 3447 * Perform deletion of network-layer and/or link-layer multicast address. 3448 * 3449 * Return 0 if the reference count was decremented. 3450 * Return 1 if the final reference was released, indicating that the 3451 * hardware hash filter should be reprogrammed. 3452 */ 3453static int 3454if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3455{ 3456 struct ifmultiaddr *ll_ifma; 3457 3458 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3459 KASSERT(ifma->ifma_ifp == ifp, 3460 ("%s: inconsistent ifp %p", __func__, ifp)); 3461 IF_ADDR_WLOCK_ASSERT(ifp); 3462 } 3463 3464 ifp = ifma->ifma_ifp; 3465 3466 /* 3467 * If the ifnet is detaching, null out references to ifnet, 3468 * so that upper protocol layers will notice, and not attempt 3469 * to obtain locks for an ifnet which no longer exists. The 3470 * routing socket announcement must happen before the ifnet 3471 * instance is detached from the system. 3472 */ 3473 if (detaching) { 3474#ifdef DIAGNOSTIC 3475 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3476#endif 3477 /* 3478 * ifp may already be nulled out if we are being reentered 3479 * to delete the ll_ifma. 3480 */ 3481 if (ifp != NULL) { 3482 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3483 ifma->ifma_ifp = NULL; 3484 } 3485 } 3486 3487 if (--ifma->ifma_refcount > 0) 3488 return 0; 3489 3490 /* 3491 * If this ifma is a network-layer ifma, a link-layer ifma may 3492 * have been associated with it. Release it first if so. 3493 */ 3494 ll_ifma = ifma->ifma_llifma; 3495 if (ll_ifma != NULL) { 3496 KASSERT(ifma->ifma_lladdr != NULL, 3497 ("%s: llifma w/o lladdr", __func__)); 3498 if (detaching) 3499 ll_ifma->ifma_ifp = NULL; /* XXX */ 3500 if (--ll_ifma->ifma_refcount == 0) { 3501 if (ifp != NULL) { 3502 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3503 ifma_link); 3504 } 3505 if_freemulti(ll_ifma); 3506 } 3507 } 3508 3509 if (ifp != NULL) 3510 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3511 3512 if_freemulti(ifma); 3513 3514 /* 3515 * The last reference to this instance of struct ifmultiaddr 3516 * was released; the hardware should be notified of this change. 3517 */ 3518 return 1; 3519} 3520 3521/* 3522 * Set the link layer address on an interface. 3523 * 3524 * At this time we only support certain types of interfaces, 3525 * and we don't allow the length of the address to change. 3526 */ 3527int 3528if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3529{ 3530 struct sockaddr_dl *sdl; 3531 struct ifaddr *ifa; 3532 struct ifreq ifr; 3533 3534 IF_ADDR_RLOCK(ifp); 3535 ifa = ifp->if_addr; 3536 if (ifa == NULL) { 3537 IF_ADDR_RUNLOCK(ifp); 3538 return (EINVAL); 3539 } 3540 ifa_ref(ifa); 3541 IF_ADDR_RUNLOCK(ifp); 3542 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3543 if (sdl == NULL) { 3544 ifa_free(ifa); 3545 return (EINVAL); 3546 } 3547 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3548 ifa_free(ifa); 3549 return (EINVAL); 3550 } 3551 switch (ifp->if_type) { 3552 case IFT_ETHER: 3553 case IFT_FDDI: 3554 case IFT_XETHER: 3555 case IFT_ISO88025: 3556 case IFT_L2VLAN: 3557 case IFT_BRIDGE: 3558 case IFT_ARCNET: 3559 case IFT_IEEE8023ADLAG: 3560 case IFT_IEEE80211: 3561 bcopy(lladdr, LLADDR(sdl), len); 3562 ifa_free(ifa); 3563 break; 3564 default: 3565 ifa_free(ifa); 3566 return (ENODEV); 3567 } 3568 3569 /* 3570 * If the interface is already up, we need 3571 * to re-init it in order to reprogram its 3572 * address filter. 3573 */ 3574 if ((ifp->if_flags & IFF_UP) != 0) { 3575 if (ifp->if_ioctl) { 3576 ifp->if_flags &= ~IFF_UP; 3577 ifr.ifr_flags = ifp->if_flags & 0xffff; 3578 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3579 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3580 ifp->if_flags |= IFF_UP; 3581 ifr.ifr_flags = ifp->if_flags & 0xffff; 3582 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3583 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3584 } 3585#ifdef INET 3586 /* 3587 * Also send gratuitous ARPs to notify other nodes about 3588 * the address change. 3589 */ 3590 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3591 if (ifa->ifa_addr->sa_family == AF_INET) 3592 arp_ifinit(ifp, ifa); 3593 } 3594#endif 3595 } 3596 return (0); 3597} 3598 3599/* 3600 * Get the link layer address that was read from the hardware at attach. 3601 * 3602 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3603 * their component interfaces as IFT_IEEE8023ADLAG. 3604 */ 3605int 3606if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3607{ 3608 3609 if (ifp->if_hw_addr == NULL) 3610 return (ENODEV); 3611 3612 switch (ifp->if_type) { 3613 case IFT_ETHER: 3614 case IFT_IEEE8023ADLAG: 3615 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3616 return (0); 3617 default: 3618 return (ENODEV); 3619 } 3620} 3621 3622/* 3623 * The name argument must be a pointer to storage which will last as 3624 * long as the interface does. For physical devices, the result of 3625 * device_get_name(dev) is a good choice and for pseudo-devices a 3626 * static string works well. 3627 */ 3628void 3629if_initname(struct ifnet *ifp, const char *name, int unit) 3630{ 3631 ifp->if_dname = name; 3632 ifp->if_dunit = unit; 3633 if (unit != IF_DUNIT_NONE) 3634 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3635 else 3636 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3637} 3638 3639int 3640if_printf(struct ifnet *ifp, const char * fmt, ...) 3641{ 3642 va_list ap; 3643 int retval; 3644 3645 retval = printf("%s: ", ifp->if_xname); 3646 va_start(ap, fmt); 3647 retval += vprintf(fmt, ap); 3648 va_end(ap); 3649 return (retval); 3650} 3651 3652void 3653if_start(struct ifnet *ifp) 3654{ 3655 3656 (*(ifp)->if_start)(ifp); 3657} 3658 3659/* 3660 * Backwards compatibility interface for drivers 3661 * that have not implemented it 3662 */ 3663static int 3664if_transmit(struct ifnet *ifp, struct mbuf *m) 3665{ 3666 int error; 3667 3668 IFQ_HANDOFF(ifp, m, error); 3669 return (error); 3670} 3671 3672static void 3673if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 3674{ 3675 3676 m_freem(m); 3677} 3678 3679int 3680if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3681{ 3682 int active = 0; 3683 3684 IF_LOCK(ifq); 3685 if (_IF_QFULL(ifq)) { 3686 _IF_DROP(ifq); 3687 IF_UNLOCK(ifq); 3688 m_freem(m); 3689 return (0); 3690 } 3691 if (ifp != NULL) { 3692 ifp->if_obytes += m->m_pkthdr.len + adjust; 3693 if (m->m_flags & (M_BCAST|M_MCAST)) 3694 ifp->if_omcasts++; 3695 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3696 } 3697 _IF_ENQUEUE(ifq, m); 3698 IF_UNLOCK(ifq); 3699 if (ifp != NULL && !active) 3700 (*(ifp)->if_start)(ifp); 3701 return (1); 3702} 3703 3704void 3705if_register_com_alloc(u_char type, 3706 if_com_alloc_t *a, if_com_free_t *f) 3707{ 3708 3709 KASSERT(if_com_alloc[type] == NULL, 3710 ("if_register_com_alloc: %d already registered", type)); 3711 KASSERT(if_com_free[type] == NULL, 3712 ("if_register_com_alloc: %d free already registered", type)); 3713 3714 if_com_alloc[type] = a; 3715 if_com_free[type] = f; 3716} 3717 3718void 3719if_deregister_com_alloc(u_char type) 3720{ 3721 3722 KASSERT(if_com_alloc[type] != NULL, 3723 ("if_deregister_com_alloc: %d not registered", type)); 3724 KASSERT(if_com_free[type] != NULL, 3725 ("if_deregister_com_alloc: %d free not registered", type)); 3726 if_com_alloc[type] = NULL; 3727 if_com_free[type] = NULL; 3728} 3729