1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_inet6.h" 36 #include "opt_inet.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/conf.h> 41 #include <sys/malloc.h> 42 #include <sys/sbuf.h> 43 #include <sys/bus.h> 44 #include <sys/epoch.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/refcount.h> 55 #include <sys/module.h> 56 #include <sys/rwlock.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/taskqueue.h> 62 #include <sys/domain.h> 63 #include <sys/jail.h> 64 #include <sys/priv.h> 65 66 #include <machine/stdarg.h> 67 #include <vm/uma.h> 68 69 #include <net/bpf.h> 70 #include <net/ethernet.h> 71 #include <net/if.h> 72 #include <net/if_arp.h> 73 #include <net/if_clone.h> 74 #include <net/if_dl.h> 75 #include <net/if_types.h> 76 #include <net/if_var.h> 77 #include <net/if_media.h> 78 #include <net/if_vlan_var.h> 79 #include <net/radix.h> 80 #include <net/route.h> 81 #include <net/vnet.h> 82 83 #if defined(INET) || defined(INET6) 84 #include <net/ethernet.h> 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_carp.h> 89 #ifdef INET 90 #include <netinet/if_ether.h> 91 #include <netinet/netdump/netdump.h> 92 #endif /* INET */ 93 #ifdef INET6 94 #include <netinet6/in6_var.h> 95 #include <netinet6/in6_ifattach.h> 96 #endif /* INET6 */ 97 #endif /* INET || INET6 */ 98 99 #include <security/mac/mac_framework.h> 100 101 /* 102 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 103 * and ifr_ifru when it is used in SIOCGIFCONF. 104 */ 105 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 106 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 107 108 __read_mostly epoch_t net_epoch_preempt; 109 __read_mostly epoch_t net_epoch; 110 #ifdef COMPAT_FREEBSD32 111 #include <sys/mount.h> 112 #include <compat/freebsd32/freebsd32.h> 113 114 struct ifreq_buffer32 { 115 uint32_t length; /* (size_t) */ 116 uint32_t buffer; /* (void *) */ 117 }; 118 119 /* 120 * Interface request structure used for socket 121 * ioctl's. All interface ioctl's must have parameter 122 * definitions which begin with ifr_name. The 123 * remainder may be interface specific. 124 */ 125 struct ifreq32 { 126 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 127 union { 128 struct sockaddr ifru_addr; 129 struct sockaddr ifru_dstaddr; 130 struct sockaddr ifru_broadaddr; 131 struct ifreq_buffer32 ifru_buffer; 132 short ifru_flags[2]; 133 short ifru_index; 134 int ifru_jid; 135 int ifru_metric; 136 int ifru_mtu; 137 int ifru_phys; 138 int ifru_media; 139 uint32_t ifru_data; 140 int ifru_cap[2]; 141 u_int ifru_fib; 142 u_char ifru_vlan_pcp; 143 } ifr_ifru; 144 }; 145 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 146 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 147 __offsetof(struct ifreq32, ifr_ifru)); 148 149 struct ifgroupreq32 { 150 char ifgr_name[IFNAMSIZ]; 151 u_int ifgr_len; 152 union { 153 char ifgru_group[IFNAMSIZ]; 154 uint32_t ifgru_groups; 155 } ifgr_ifgru; 156 }; 157 158 struct ifmediareq32 { 159 char ifm_name[IFNAMSIZ]; 160 int ifm_current; 161 int ifm_mask; 162 int ifm_status; 163 int ifm_active; 164 int ifm_count; 165 uint32_t ifm_ulist; /* (int *) */ 166 }; 167 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 168 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 169 170 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 171 case _IOC_NEWTYPE((cmd), struct ifgroupreq32): 172 #else /* !COMPAT_FREEBSD32 */ 173 #define _CASE_IOC_IFGROUPREQ_32(cmd) 174 #endif /* !COMPAT_FREEBSD32 */ 175 176 #define CASE_IOC_IFGROUPREQ(cmd) \ 177 _CASE_IOC_IFGROUPREQ_32(cmd) \ 178 case (cmd) 179 180 union ifreq_union { 181 struct ifreq ifr; 182 #ifdef COMPAT_FREEBSD32 183 struct ifreq32 ifr32; 184 #endif 185 }; 186 187 union ifgroupreq_union { 188 struct ifgroupreq ifgr; 189 #ifdef COMPAT_FREEBSD32 190 struct ifgroupreq32 ifgr32; 191 #endif 192 }; 193 194 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 195 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 196 197 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 198 &ifqmaxlen, 0, "max send queue size"); 199 200 /* Log link state change events */ 201 static int log_link_state_change = 1; 202 203 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 204 &log_link_state_change, 0, 205 "log interface link state change events"); 206 207 /* Log promiscuous mode change events */ 208 static int log_promisc_mode_change = 1; 209 210 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 211 &log_promisc_mode_change, 1, 212 "log promiscuous mode change events"); 213 214 /* Interface description */ 215 static unsigned int ifdescr_maxlen = 1024; 216 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 217 &ifdescr_maxlen, 0, 218 "administrative maximum length for interface description"); 219 220 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 221 222 /* global sx for non-critical path ifdescr */ 223 static struct sx ifdescr_sx; 224 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 225 226 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 227 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 228 /* These are external hooks for CARP. */ 229 void (*carp_linkstate_p)(struct ifnet *ifp); 230 void (*carp_demote_adj_p)(int, char *); 231 int (*carp_master_p)(struct ifaddr *); 232 #if defined(INET) || defined(INET6) 233 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 234 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 235 const struct sockaddr *sa); 236 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 237 int (*carp_attach_p)(struct ifaddr *, int); 238 void (*carp_detach_p)(struct ifaddr *, bool); 239 #endif 240 #ifdef INET 241 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 242 #endif 243 #ifdef INET6 244 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 245 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 246 const struct in6_addr *taddr); 247 #endif 248 249 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 250 251 /* 252 * XXX: Style; these should be sorted alphabetically, and unprototyped 253 * static functions should be prototyped. Currently they are sorted by 254 * declaration order. 255 */ 256 static void if_attachdomain(void *); 257 static void if_attachdomain1(struct ifnet *); 258 static int ifconf(u_long, caddr_t); 259 static void *if_grow(void); 260 static void if_input_default(struct ifnet *, struct mbuf *); 261 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 262 static void if_route(struct ifnet *, int flag, int fam); 263 static int if_setflag(struct ifnet *, int, int, int *, int); 264 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 265 static void if_unroute(struct ifnet *, int flag, int fam); 266 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 267 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 268 static void do_link_state_change(void *, int); 269 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 270 static int if_getgroupmembers(struct ifgroupreq *); 271 static void if_delgroups(struct ifnet *); 272 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 273 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 274 #ifdef VIMAGE 275 static void if_vmove(struct ifnet *, struct vnet *); 276 #endif 277 278 #ifdef INET6 279 /* 280 * XXX: declare here to avoid to include many inet6 related files.. 281 * should be more generalized? 282 */ 283 extern void nd6_setmtu(struct ifnet *); 284 #endif 285 286 /* ipsec helper hooks */ 287 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 289 290 VNET_DEFINE(int, if_index); 291 int ifqmaxlen = IFQ_MAXLEN; 292 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 293 VNET_DEFINE(struct ifgrouphead, ifg_head); 294 295 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 296 297 /* Table of ifnet by index. */ 298 VNET_DEFINE(struct ifnet **, ifindex_table); 299 300 #define V_if_indexlim VNET(if_indexlim) 301 #define V_ifindex_table VNET(ifindex_table) 302 303 /* 304 * The global network interface list (V_ifnet) and related state (such as 305 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 306 * an rwlock. Either may be acquired shared to stablize the list, but both 307 * must be acquired writable to modify the list. This model allows us to 308 * both stablize the interface list during interrupt thread processing, but 309 * also to stablize it over long-running ioctls, without introducing priority 310 * inversions and deadlocks. 311 */ 312 struct rwlock ifnet_rwlock; 313 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 314 struct sx ifnet_sxlock; 315 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 316 317 /* 318 * The allocation of network interfaces is a rather non-atomic affair; we 319 * need to select an index before we are ready to expose the interface for 320 * use, so will use this pointer value to indicate reservation. 321 */ 322 #define IFNET_HOLD (void *)(uintptr_t)(-1) 323 324 static if_com_alloc_t *if_com_alloc[256]; 325 static if_com_free_t *if_com_free[256]; 326 327 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 328 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 329 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 330 331 struct ifnet * 332 ifnet_byindex_locked(u_short idx) 333 { 334 335 if (idx > V_if_index) 336 return (NULL); 337 if (V_ifindex_table[idx] == IFNET_HOLD) 338 return (NULL); 339 return (V_ifindex_table[idx]); 340 } 341 342 struct ifnet * 343 ifnet_byindex(u_short idx) 344 { 345 struct ifnet *ifp; 346 347 ifp = ifnet_byindex_locked(idx); 348 return (ifp); 349 } 350 351 struct ifnet * 352 ifnet_byindex_ref(u_short idx) 353 { 354 struct ifnet *ifp; 355 356 IFNET_RLOCK_NOSLEEP(); 357 ifp = ifnet_byindex_locked(idx); 358 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 359 IFNET_RUNLOCK_NOSLEEP(); 360 return (NULL); 361 } 362 if_ref(ifp); 363 IFNET_RUNLOCK_NOSLEEP(); 364 return (ifp); 365 } 366 367 /* 368 * Allocate an ifindex array entry; return 0 on success or an error on 369 * failure. 370 */ 371 static u_short 372 ifindex_alloc(void **old) 373 { 374 u_short idx; 375 376 IFNET_WLOCK_ASSERT(); 377 /* 378 * Try to find an empty slot below V_if_index. If we fail, take the 379 * next slot. 380 */ 381 for (idx = 1; idx <= V_if_index; idx++) { 382 if (V_ifindex_table[idx] == NULL) 383 break; 384 } 385 386 /* Catch if_index overflow. */ 387 if (idx >= V_if_indexlim) { 388 *old = if_grow(); 389 return (USHRT_MAX); 390 } 391 if (idx > V_if_index) 392 V_if_index = idx; 393 return (idx); 394 } 395 396 static void 397 ifindex_free_locked(u_short idx) 398 { 399 400 IFNET_WLOCK_ASSERT(); 401 402 V_ifindex_table[idx] = NULL; 403 while (V_if_index > 0 && 404 V_ifindex_table[V_if_index] == NULL) 405 V_if_index--; 406 } 407 408 static void 409 ifindex_free(u_short idx) 410 { 411 412 IFNET_WLOCK(); 413 ifindex_free_locked(idx); 414 IFNET_WUNLOCK(); 415 } 416 417 static void 418 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 419 { 420 421 V_ifindex_table[idx] = ifp; 422 } 423 424 struct ifaddr * 425 ifaddr_byindex(u_short idx) 426 { 427 struct ifnet *ifp; 428 struct ifaddr *ifa = NULL; 429 430 IFNET_RLOCK_NOSLEEP(); 431 ifp = ifnet_byindex_locked(idx); 432 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 433 ifa_ref(ifa); 434 IFNET_RUNLOCK_NOSLEEP(); 435 return (ifa); 436 } 437 438 /* 439 * Network interface utility routines. 440 * 441 * Routines with ifa_ifwith* names take sockaddr *'s as 442 * parameters. 443 */ 444 445 static void 446 vnet_if_init(const void *unused __unused) 447 { 448 void *old; 449 450 CK_STAILQ_INIT(&V_ifnet); 451 CK_STAILQ_INIT(&V_ifg_head); 452 IFNET_WLOCK(); 453 old = if_grow(); /* create initial table */ 454 IFNET_WUNLOCK(); 455 epoch_wait_preempt(net_epoch_preempt); 456 free(old, M_IFNET); 457 vnet_if_clone_init(); 458 } 459 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 460 NULL); 461 462 #ifdef VIMAGE 463 static void 464 vnet_if_uninit(const void *unused __unused) 465 { 466 467 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 468 "not empty", __func__, __LINE__, &V_ifnet)); 469 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 470 "not empty", __func__, __LINE__, &V_ifg_head)); 471 472 free((caddr_t)V_ifindex_table, M_IFNET); 473 } 474 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 475 vnet_if_uninit, NULL); 476 477 static void 478 vnet_if_return(const void *unused __unused) 479 { 480 struct ifnet *ifp, *nifp; 481 482 /* Return all inherited interfaces to their parent vnets. */ 483 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 484 if (ifp->if_home_vnet != ifp->if_vnet) 485 if_vmove(ifp, ifp->if_home_vnet); 486 } 487 } 488 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 489 vnet_if_return, NULL); 490 #endif 491 492 493 static void * 494 if_grow(void) 495 { 496 int oldlim; 497 u_int n; 498 struct ifnet **e; 499 void *old; 500 501 old = NULL; 502 IFNET_WLOCK_ASSERT(); 503 oldlim = V_if_indexlim; 504 IFNET_WUNLOCK(); 505 n = (oldlim << 1) * sizeof(*e); 506 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 507 IFNET_WLOCK(); 508 if (V_if_indexlim != oldlim) { 509 free(e, M_IFNET); 510 return (NULL); 511 } 512 if (V_ifindex_table != NULL) { 513 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 514 old = V_ifindex_table; 515 } 516 V_if_indexlim <<= 1; 517 V_ifindex_table = e; 518 return (old); 519 } 520 521 /* 522 * Allocate a struct ifnet and an index for an interface. A layer 2 523 * common structure will also be allocated if an allocation routine is 524 * registered for the passed type. 525 */ 526 struct ifnet * 527 if_alloc(u_char type) 528 { 529 struct ifnet *ifp; 530 u_short idx; 531 void *old; 532 533 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 534 restart: 535 IFNET_WLOCK(); 536 idx = ifindex_alloc(&old); 537 if (__predict_false(idx == USHRT_MAX)) { 538 IFNET_WUNLOCK(); 539 epoch_wait_preempt(net_epoch_preempt); 540 free(old, M_IFNET); 541 goto restart; 542 } 543 ifnet_setbyindex(idx, IFNET_HOLD); 544 IFNET_WUNLOCK(); 545 ifp->if_index = idx; 546 ifp->if_type = type; 547 ifp->if_alloctype = type; 548 #ifdef VIMAGE 549 ifp->if_vnet = curvnet; 550 #endif 551 if (if_com_alloc[type] != NULL) { 552 ifp->if_l2com = if_com_alloc[type](type, ifp); 553 if (ifp->if_l2com == NULL) { 554 free(ifp, M_IFNET); 555 ifindex_free(idx); 556 return (NULL); 557 } 558 } 559 560 IF_ADDR_LOCK_INIT(ifp); 561 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 562 ifp->if_afdata_initialized = 0; 563 IF_AFDATA_LOCK_INIT(ifp); 564 CK_STAILQ_INIT(&ifp->if_addrhead); 565 CK_STAILQ_INIT(&ifp->if_multiaddrs); 566 CK_STAILQ_INIT(&ifp->if_groups); 567 #ifdef MAC 568 mac_ifnet_init(ifp); 569 #endif 570 ifq_init(&ifp->if_snd, ifp); 571 572 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 573 for (int i = 0; i < IFCOUNTERS; i++) 574 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 575 ifp->if_get_counter = if_get_counter_default; 576 ifp->if_pcp = IFNET_PCP_NONE; 577 ifnet_setbyindex(ifp->if_index, ifp); 578 return (ifp); 579 } 580 581 /* 582 * Do the actual work of freeing a struct ifnet, and layer 2 common 583 * structure. This call is made when the last reference to an 584 * interface is released. 585 */ 586 static void 587 if_free_internal(struct ifnet *ifp) 588 { 589 590 KASSERT((ifp->if_flags & IFF_DYING), 591 ("if_free_internal: interface not dying")); 592 593 if (if_com_free[ifp->if_alloctype] != NULL) 594 if_com_free[ifp->if_alloctype](ifp->if_l2com, 595 ifp->if_alloctype); 596 597 #ifdef MAC 598 mac_ifnet_destroy(ifp); 599 #endif /* MAC */ 600 if (ifp->if_description != NULL) 601 free(ifp->if_description, M_IFDESCR); 602 IF_AFDATA_DESTROY(ifp); 603 IF_ADDR_LOCK_DESTROY(ifp); 604 ifq_delete(&ifp->if_snd); 605 606 for (int i = 0; i < IFCOUNTERS; i++) 607 counter_u64_free(ifp->if_counters[i]); 608 609 free(ifp, M_IFNET); 610 } 611 612 static void 613 if_destroy(epoch_context_t ctx) 614 { 615 struct ifnet *ifp; 616 617 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 618 if_free_internal(ifp); 619 } 620 621 /* 622 * Deregister an interface and free the associated storage. 623 */ 624 void 625 if_free(struct ifnet *ifp) 626 { 627 628 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 629 630 CURVNET_SET_QUIET(ifp->if_vnet); 631 IFNET_WLOCK(); 632 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 633 ("%s: freeing unallocated ifnet", ifp->if_xname)); 634 635 ifindex_free_locked(ifp->if_index); 636 IFNET_WUNLOCK(); 637 638 if (refcount_release(&ifp->if_refcount)) 639 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 640 CURVNET_RESTORE(); 641 } 642 643 /* 644 * Interfaces to keep an ifnet type-stable despite the possibility of the 645 * driver calling if_free(). If there are additional references, we defer 646 * freeing the underlying data structure. 647 */ 648 void 649 if_ref(struct ifnet *ifp) 650 { 651 652 /* We don't assert the ifnet list lock here, but arguably should. */ 653 refcount_acquire(&ifp->if_refcount); 654 } 655 656 void 657 if_rele(struct ifnet *ifp) 658 { 659 660 if (!refcount_release(&ifp->if_refcount)) 661 return; 662 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 663 } 664 665 void 666 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 667 { 668 669 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 670 671 if (ifq->ifq_maxlen == 0) 672 ifq->ifq_maxlen = ifqmaxlen; 673 674 ifq->altq_type = 0; 675 ifq->altq_disc = NULL; 676 ifq->altq_flags &= ALTQF_CANTCHANGE; 677 ifq->altq_tbr = NULL; 678 ifq->altq_ifp = ifp; 679 } 680 681 void 682 ifq_delete(struct ifaltq *ifq) 683 { 684 mtx_destroy(&ifq->ifq_mtx); 685 } 686 687 /* 688 * Perform generic interface initialization tasks and attach the interface 689 * to the list of "active" interfaces. If vmove flag is set on entry 690 * to if_attach_internal(), perform only a limited subset of initialization 691 * tasks, given that we are moving from one vnet to another an ifnet which 692 * has already been fully initialized. 693 * 694 * Note that if_detach_internal() removes group membership unconditionally 695 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 696 * Thus, when if_vmove() is applied to a cloned interface, group membership 697 * is lost while a cloned one always joins a group whose name is 698 * ifc->ifc_name. To recover this after if_detach_internal() and 699 * if_attach_internal(), the cloner should be specified to 700 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 701 * attempts to join a group whose name is ifc->ifc_name. 702 * 703 * XXX: 704 * - The decision to return void and thus require this function to 705 * succeed is questionable. 706 * - We should probably do more sanity checking. For instance we don't 707 * do anything to insure if_xname is unique or non-empty. 708 */ 709 void 710 if_attach(struct ifnet *ifp) 711 { 712 713 if_attach_internal(ifp, 0, NULL); 714 } 715 716 /* 717 * Compute the least common TSO limit. 718 */ 719 void 720 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 721 { 722 /* 723 * 1) If there is no limit currently, take the limit from 724 * the network adapter. 725 * 726 * 2) If the network adapter has a limit below the current 727 * limit, apply it. 728 */ 729 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 730 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 731 pmax->tsomaxbytes = ifp->if_hw_tsomax; 732 } 733 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 734 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 735 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 736 } 737 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 738 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 739 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 740 } 741 } 742 743 /* 744 * Update TSO limit of a network adapter. 745 * 746 * Returns zero if no change. Else non-zero. 747 */ 748 int 749 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 750 { 751 int retval = 0; 752 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 753 ifp->if_hw_tsomax = pmax->tsomaxbytes; 754 retval++; 755 } 756 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 757 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 758 retval++; 759 } 760 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 761 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 762 retval++; 763 } 764 return (retval); 765 } 766 767 static void 768 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 769 { 770 unsigned socksize, ifasize; 771 int namelen, masklen; 772 struct sockaddr_dl *sdl; 773 struct ifaddr *ifa; 774 775 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 776 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 777 ifp->if_xname); 778 779 #ifdef VIMAGE 780 ifp->if_vnet = curvnet; 781 if (ifp->if_home_vnet == NULL) 782 ifp->if_home_vnet = curvnet; 783 #endif 784 785 if_addgroup(ifp, IFG_ALL); 786 787 /* Restore group membership for cloned interfaces. */ 788 if (vmove && ifc != NULL) 789 if_clone_addgroup(ifp, ifc); 790 791 getmicrotime(&ifp->if_lastchange); 792 ifp->if_epoch = time_uptime; 793 794 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 795 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 796 ("transmit and qflush must both either be set or both be NULL")); 797 if (ifp->if_transmit == NULL) { 798 ifp->if_transmit = if_transmit; 799 ifp->if_qflush = if_qflush; 800 } 801 if (ifp->if_input == NULL) 802 ifp->if_input = if_input_default; 803 804 if (ifp->if_requestencap == NULL) 805 ifp->if_requestencap = if_requestencap_default; 806 807 if (!vmove) { 808 #ifdef MAC 809 mac_ifnet_create(ifp); 810 #endif 811 812 /* 813 * Create a Link Level name for this device. 814 */ 815 namelen = strlen(ifp->if_xname); 816 /* 817 * Always save enough space for any possiable name so we 818 * can do a rename in place later. 819 */ 820 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 821 socksize = masklen + ifp->if_addrlen; 822 if (socksize < sizeof(*sdl)) 823 socksize = sizeof(*sdl); 824 socksize = roundup2(socksize, sizeof(long)); 825 ifasize = sizeof(*ifa) + 2 * socksize; 826 ifa = ifa_alloc(ifasize, M_WAITOK); 827 sdl = (struct sockaddr_dl *)(ifa + 1); 828 sdl->sdl_len = socksize; 829 sdl->sdl_family = AF_LINK; 830 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 831 sdl->sdl_nlen = namelen; 832 sdl->sdl_index = ifp->if_index; 833 sdl->sdl_type = ifp->if_type; 834 ifp->if_addr = ifa; 835 ifa->ifa_ifp = ifp; 836 ifa->ifa_rtrequest = link_rtrequest; 837 ifa->ifa_addr = (struct sockaddr *)sdl; 838 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 839 ifa->ifa_netmask = (struct sockaddr *)sdl; 840 sdl->sdl_len = masklen; 841 while (namelen != 0) 842 sdl->sdl_data[--namelen] = 0xff; 843 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 844 /* Reliably crash if used uninitialized. */ 845 ifp->if_broadcastaddr = NULL; 846 847 if (ifp->if_type == IFT_ETHER) { 848 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 849 M_WAITOK | M_ZERO); 850 } 851 852 #if defined(INET) || defined(INET6) 853 /* Use defaults for TSO, if nothing is set */ 854 if (ifp->if_hw_tsomax == 0 && 855 ifp->if_hw_tsomaxsegcount == 0 && 856 ifp->if_hw_tsomaxsegsize == 0) { 857 /* 858 * The TSO defaults needs to be such that an 859 * NFS mbuf list of 35 mbufs totalling just 860 * below 64K works and that a chain of mbufs 861 * can be defragged into at most 32 segments: 862 */ 863 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 864 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 865 ifp->if_hw_tsomaxsegcount = 35; 866 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 867 868 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 869 if (ifp->if_capabilities & IFCAP_TSO) { 870 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 871 ifp->if_hw_tsomax, 872 ifp->if_hw_tsomaxsegcount, 873 ifp->if_hw_tsomaxsegsize); 874 } 875 } 876 #endif 877 } 878 #ifdef VIMAGE 879 else { 880 /* 881 * Update the interface index in the link layer address 882 * of the interface. 883 */ 884 for (ifa = ifp->if_addr; ifa != NULL; 885 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 886 if (ifa->ifa_addr->sa_family == AF_LINK) { 887 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 888 sdl->sdl_index = ifp->if_index; 889 } 890 } 891 } 892 #endif 893 894 IFNET_WLOCK(); 895 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 896 #ifdef VIMAGE 897 curvnet->vnet_ifcnt++; 898 #endif 899 IFNET_WUNLOCK(); 900 901 if (domain_init_status >= 2) 902 if_attachdomain1(ifp); 903 904 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 905 if (IS_DEFAULT_VNET(curvnet)) 906 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 907 908 /* Announce the interface. */ 909 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 910 } 911 912 static void 913 if_epochalloc(void *dummy __unused) 914 { 915 916 net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT); 917 net_epoch = epoch_alloc(0); 918 } 919 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 920 if_epochalloc, NULL); 921 922 static void 923 if_attachdomain(void *dummy) 924 { 925 struct ifnet *ifp; 926 927 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 928 if_attachdomain1(ifp); 929 } 930 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 931 if_attachdomain, NULL); 932 933 static void 934 if_attachdomain1(struct ifnet *ifp) 935 { 936 struct domain *dp; 937 938 /* 939 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 940 * cannot lock ifp->if_afdata initialization, entirely. 941 */ 942 IF_AFDATA_LOCK(ifp); 943 if (ifp->if_afdata_initialized >= domain_init_status) { 944 IF_AFDATA_UNLOCK(ifp); 945 log(LOG_WARNING, "%s called more than once on %s\n", 946 __func__, ifp->if_xname); 947 return; 948 } 949 ifp->if_afdata_initialized = domain_init_status; 950 IF_AFDATA_UNLOCK(ifp); 951 952 /* address family dependent data region */ 953 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 954 for (dp = domains; dp; dp = dp->dom_next) { 955 if (dp->dom_ifattach) 956 ifp->if_afdata[dp->dom_family] = 957 (*dp->dom_ifattach)(ifp); 958 } 959 } 960 961 /* 962 * Remove any unicast or broadcast network addresses from an interface. 963 */ 964 void 965 if_purgeaddrs(struct ifnet *ifp) 966 { 967 struct ifaddr *ifa; 968 969 while (1) { 970 NET_EPOCH_ENTER(); 971 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 972 if (ifa->ifa_addr->sa_family != AF_LINK) 973 break; 974 } 975 NET_EPOCH_EXIT(); 976 977 if (ifa == NULL) 978 break; 979 #ifdef INET 980 /* XXX: Ugly!! ad hoc just for INET */ 981 if (ifa->ifa_addr->sa_family == AF_INET) { 982 struct ifaliasreq ifr; 983 984 bzero(&ifr, sizeof(ifr)); 985 ifr.ifra_addr = *ifa->ifa_addr; 986 if (ifa->ifa_dstaddr) 987 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 988 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 989 NULL) == 0) 990 continue; 991 } 992 #endif /* INET */ 993 #ifdef INET6 994 if (ifa->ifa_addr->sa_family == AF_INET6) { 995 in6_purgeaddr(ifa); 996 /* ifp_addrhead is already updated */ 997 continue; 998 } 999 #endif /* INET6 */ 1000 IF_ADDR_WLOCK(ifp); 1001 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1002 IF_ADDR_WUNLOCK(ifp); 1003 ifa_free(ifa); 1004 } 1005 } 1006 1007 /* 1008 * Remove any multicast network addresses from an interface when an ifnet 1009 * is going away. 1010 */ 1011 static void 1012 if_purgemaddrs(struct ifnet *ifp) 1013 { 1014 struct ifmultiaddr *ifma; 1015 1016 IF_ADDR_WLOCK(ifp); 1017 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1018 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1019 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1020 if_delmulti_locked(ifp, ifma, 1); 1021 } 1022 IF_ADDR_WUNLOCK(ifp); 1023 } 1024 1025 /* 1026 * Detach an interface, removing it from the list of "active" interfaces. 1027 * If vmove flag is set on entry to if_detach_internal(), perform only a 1028 * limited subset of cleanup tasks, given that we are moving an ifnet from 1029 * one vnet to another, where it must be fully operational. 1030 * 1031 * XXXRW: There are some significant questions about event ordering, and 1032 * how to prevent things from starting to use the interface during detach. 1033 */ 1034 void 1035 if_detach(struct ifnet *ifp) 1036 { 1037 1038 CURVNET_SET_QUIET(ifp->if_vnet); 1039 if_detach_internal(ifp, 0, NULL); 1040 CURVNET_RESTORE(); 1041 } 1042 1043 /* 1044 * The vmove flag, if set, indicates that we are called from a callpath 1045 * that is moving an interface to a different vnet instance. 1046 * 1047 * The shutdown flag, if set, indicates that we are called in the 1048 * process of shutting down a vnet instance. Currently only the 1049 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1050 * on a vnet instance shutdown without this flag being set, e.g., when 1051 * the cloned interfaces are destoyed as first thing of teardown. 1052 */ 1053 static int 1054 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1055 { 1056 struct ifaddr *ifa; 1057 int i; 1058 struct domain *dp; 1059 struct ifnet *iter; 1060 int found = 0; 1061 #ifdef VIMAGE 1062 int shutdown; 1063 1064 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1065 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1066 #endif 1067 IFNET_WLOCK(); 1068 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1069 if (iter == ifp) { 1070 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1071 found = 1; 1072 break; 1073 } 1074 IFNET_WUNLOCK(); 1075 if (!found) { 1076 /* 1077 * While we would want to panic here, we cannot 1078 * guarantee that the interface is indeed still on 1079 * the list given we don't hold locks all the way. 1080 */ 1081 return (ENOENT); 1082 #if 0 1083 if (vmove) 1084 panic("%s: ifp=%p not on the ifnet tailq %p", 1085 __func__, ifp, &V_ifnet); 1086 else 1087 return; /* XXX this should panic as well? */ 1088 #endif 1089 } 1090 1091 /* 1092 * At this point we know the interface still was on the ifnet list 1093 * and we removed it so we are in a stable state. 1094 */ 1095 #ifdef VIMAGE 1096 curvnet->vnet_ifcnt--; 1097 #endif 1098 epoch_wait_preempt(net_epoch_preempt); 1099 /* 1100 * In any case (destroy or vmove) detach us from the groups 1101 * and remove/wait for pending events on the taskq. 1102 * XXX-BZ in theory an interface could still enqueue a taskq change? 1103 */ 1104 if_delgroups(ifp); 1105 1106 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1107 1108 /* 1109 * Check if this is a cloned interface or not. Must do even if 1110 * shutting down as a if_vmove_reclaim() would move the ifp and 1111 * the if_clone_addgroup() will have a corrupted string overwise 1112 * from a gibberish pointer. 1113 */ 1114 if (vmove && ifcp != NULL) 1115 *ifcp = if_clone_findifc(ifp); 1116 1117 if_down(ifp); 1118 1119 #ifdef VIMAGE 1120 /* 1121 * On VNET shutdown abort here as the stack teardown will do all 1122 * the work top-down for us. 1123 */ 1124 if (shutdown) { 1125 /* 1126 * In case of a vmove we are done here without error. 1127 * If we would signal an error it would lead to the same 1128 * abort as if we did not find the ifnet anymore. 1129 * if_detach() calls us in void context and does not care 1130 * about an early abort notification, so life is splendid :) 1131 */ 1132 goto finish_vnet_shutdown; 1133 } 1134 #endif 1135 1136 /* 1137 * At this point we are not tearing down a VNET and are either 1138 * going to destroy or vmove the interface and have to cleanup 1139 * accordingly. 1140 */ 1141 1142 /* 1143 * Remove routes and flush queues. 1144 */ 1145 #ifdef ALTQ 1146 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1147 altq_disable(&ifp->if_snd); 1148 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1149 altq_detach(&ifp->if_snd); 1150 #endif 1151 1152 if_purgeaddrs(ifp); 1153 1154 #ifdef INET 1155 in_ifdetach(ifp); 1156 #endif 1157 1158 #ifdef INET6 1159 /* 1160 * Remove all IPv6 kernel structs related to ifp. This should be done 1161 * before removing routing entries below, since IPv6 interface direct 1162 * routes are expected to be removed by the IPv6-specific kernel API. 1163 * Otherwise, the kernel will detect some inconsistency and bark it. 1164 */ 1165 in6_ifdetach(ifp); 1166 #endif 1167 if_purgemaddrs(ifp); 1168 1169 /* Announce that the interface is gone. */ 1170 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1171 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1172 if (IS_DEFAULT_VNET(curvnet)) 1173 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1174 1175 if (!vmove) { 1176 /* 1177 * Prevent further calls into the device driver via ifnet. 1178 */ 1179 if_dead(ifp); 1180 1181 /* 1182 * Remove link ifaddr pointer and maybe decrement if_index. 1183 * Clean up all addresses. 1184 */ 1185 free(ifp->if_hw_addr, M_IFADDR); 1186 ifp->if_hw_addr = NULL; 1187 ifp->if_addr = NULL; 1188 1189 /* We can now free link ifaddr. */ 1190 IF_ADDR_WLOCK(ifp); 1191 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1192 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1193 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1194 IF_ADDR_WUNLOCK(ifp); 1195 ifa_free(ifa); 1196 } else 1197 IF_ADDR_WUNLOCK(ifp); 1198 } 1199 1200 rt_flushifroutes(ifp); 1201 1202 #ifdef VIMAGE 1203 finish_vnet_shutdown: 1204 #endif 1205 /* 1206 * We cannot hold the lock over dom_ifdetach calls as they might 1207 * sleep, for example trying to drain a callout, thus open up the 1208 * theoretical race with re-attaching. 1209 */ 1210 IF_AFDATA_LOCK(ifp); 1211 i = ifp->if_afdata_initialized; 1212 ifp->if_afdata_initialized = 0; 1213 IF_AFDATA_UNLOCK(ifp); 1214 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1215 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1216 (*dp->dom_ifdetach)(ifp, 1217 ifp->if_afdata[dp->dom_family]); 1218 ifp->if_afdata[dp->dom_family] = NULL; 1219 } 1220 } 1221 1222 return (0); 1223 } 1224 1225 #ifdef VIMAGE 1226 /* 1227 * if_vmove() performs a limited version of if_detach() in current 1228 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1229 * An attempt is made to shrink if_index in current vnet, find an 1230 * unused if_index in target vnet and calls if_grow() if necessary, 1231 * and finally find an unused if_xname for the target vnet. 1232 */ 1233 static void 1234 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1235 { 1236 struct if_clone *ifc; 1237 u_int bif_dlt, bif_hdrlen; 1238 void *old; 1239 int rc; 1240 1241 /* 1242 * if_detach_internal() will call the eventhandler to notify 1243 * interface departure. That will detach if_bpf. We need to 1244 * safe the dlt and hdrlen so we can re-attach it later. 1245 */ 1246 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1247 1248 /* 1249 * Detach from current vnet, but preserve LLADDR info, do not 1250 * mark as dead etc. so that the ifnet can be reattached later. 1251 * If we cannot find it, we lost the race to someone else. 1252 */ 1253 rc = if_detach_internal(ifp, 1, &ifc); 1254 if (rc != 0) 1255 return; 1256 1257 /* 1258 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1259 * the if_index for that vnet if possible. 1260 * 1261 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1262 * or we'd lock on one vnet and unlock on another. 1263 */ 1264 IFNET_WLOCK(); 1265 ifindex_free_locked(ifp->if_index); 1266 IFNET_WUNLOCK(); 1267 1268 /* 1269 * Perform interface-specific reassignment tasks, if provided by 1270 * the driver. 1271 */ 1272 if (ifp->if_reassign != NULL) 1273 ifp->if_reassign(ifp, new_vnet, NULL); 1274 1275 /* 1276 * Switch to the context of the target vnet. 1277 */ 1278 CURVNET_SET_QUIET(new_vnet); 1279 restart: 1280 IFNET_WLOCK(); 1281 ifp->if_index = ifindex_alloc(&old); 1282 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1283 IFNET_WUNLOCK(); 1284 epoch_wait_preempt(net_epoch_preempt); 1285 free(old, M_IFNET); 1286 goto restart; 1287 } 1288 ifnet_setbyindex(ifp->if_index, ifp); 1289 IFNET_WUNLOCK(); 1290 1291 if_attach_internal(ifp, 1, ifc); 1292 1293 if (ifp->if_bpf == NULL) 1294 bpfattach(ifp, bif_dlt, bif_hdrlen); 1295 1296 CURVNET_RESTORE(); 1297 } 1298 1299 /* 1300 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1301 */ 1302 static int 1303 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1304 { 1305 struct prison *pr; 1306 struct ifnet *difp; 1307 int shutdown; 1308 1309 /* Try to find the prison within our visibility. */ 1310 sx_slock(&allprison_lock); 1311 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1312 sx_sunlock(&allprison_lock); 1313 if (pr == NULL) 1314 return (ENXIO); 1315 prison_hold_locked(pr); 1316 mtx_unlock(&pr->pr_mtx); 1317 1318 /* Do not try to move the iface from and to the same prison. */ 1319 if (pr->pr_vnet == ifp->if_vnet) { 1320 prison_free(pr); 1321 return (EEXIST); 1322 } 1323 1324 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1325 /* XXX Lock interfaces to avoid races. */ 1326 CURVNET_SET_QUIET(pr->pr_vnet); 1327 difp = ifunit(ifname); 1328 if (difp != NULL) { 1329 CURVNET_RESTORE(); 1330 prison_free(pr); 1331 return (EEXIST); 1332 } 1333 1334 /* Make sure the VNET is stable. */ 1335 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1336 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1337 if (shutdown) { 1338 CURVNET_RESTORE(); 1339 prison_free(pr); 1340 return (EBUSY); 1341 } 1342 CURVNET_RESTORE(); 1343 1344 /* Move the interface into the child jail/vnet. */ 1345 if_vmove(ifp, pr->pr_vnet); 1346 1347 /* Report the new if_xname back to the userland. */ 1348 sprintf(ifname, "%s", ifp->if_xname); 1349 1350 prison_free(pr); 1351 return (0); 1352 } 1353 1354 static int 1355 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1356 { 1357 struct prison *pr; 1358 struct vnet *vnet_dst; 1359 struct ifnet *ifp; 1360 int shutdown; 1361 1362 /* Try to find the prison within our visibility. */ 1363 sx_slock(&allprison_lock); 1364 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1365 sx_sunlock(&allprison_lock); 1366 if (pr == NULL) 1367 return (ENXIO); 1368 prison_hold_locked(pr); 1369 mtx_unlock(&pr->pr_mtx); 1370 1371 /* Make sure the named iface exists in the source prison/vnet. */ 1372 CURVNET_SET(pr->pr_vnet); 1373 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1374 if (ifp == NULL) { 1375 CURVNET_RESTORE(); 1376 prison_free(pr); 1377 return (ENXIO); 1378 } 1379 1380 /* Do not try to move the iface from and to the same prison. */ 1381 vnet_dst = TD_TO_VNET(td); 1382 if (vnet_dst == ifp->if_vnet) { 1383 CURVNET_RESTORE(); 1384 prison_free(pr); 1385 return (EEXIST); 1386 } 1387 1388 /* Make sure the VNET is stable. */ 1389 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1390 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1391 if (shutdown) { 1392 CURVNET_RESTORE(); 1393 prison_free(pr); 1394 return (EBUSY); 1395 } 1396 1397 /* Get interface back from child jail/vnet. */ 1398 if_vmove(ifp, vnet_dst); 1399 CURVNET_RESTORE(); 1400 1401 /* Report the new if_xname back to the userland. */ 1402 sprintf(ifname, "%s", ifp->if_xname); 1403 1404 prison_free(pr); 1405 return (0); 1406 } 1407 #endif /* VIMAGE */ 1408 1409 /* 1410 * Add a group to an interface 1411 */ 1412 int 1413 if_addgroup(struct ifnet *ifp, const char *groupname) 1414 { 1415 struct ifg_list *ifgl; 1416 struct ifg_group *ifg = NULL; 1417 struct ifg_member *ifgm; 1418 int new = 0; 1419 1420 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1421 groupname[strlen(groupname) - 1] <= '9') 1422 return (EINVAL); 1423 1424 IFNET_WLOCK(); 1425 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1426 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1427 IFNET_WUNLOCK(); 1428 return (EEXIST); 1429 } 1430 1431 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1432 M_NOWAIT)) == NULL) { 1433 IFNET_WUNLOCK(); 1434 return (ENOMEM); 1435 } 1436 1437 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1438 M_TEMP, M_NOWAIT)) == NULL) { 1439 free(ifgl, M_TEMP); 1440 IFNET_WUNLOCK(); 1441 return (ENOMEM); 1442 } 1443 1444 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1445 if (!strcmp(ifg->ifg_group, groupname)) 1446 break; 1447 1448 if (ifg == NULL) { 1449 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1450 M_TEMP, M_NOWAIT)) == NULL) { 1451 free(ifgl, M_TEMP); 1452 free(ifgm, M_TEMP); 1453 IFNET_WUNLOCK(); 1454 return (ENOMEM); 1455 } 1456 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1457 ifg->ifg_refcnt = 0; 1458 CK_STAILQ_INIT(&ifg->ifg_members); 1459 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1460 new = 1; 1461 } 1462 1463 ifg->ifg_refcnt++; 1464 ifgl->ifgl_group = ifg; 1465 ifgm->ifgm_ifp = ifp; 1466 1467 IF_ADDR_WLOCK(ifp); 1468 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1469 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1470 IF_ADDR_WUNLOCK(ifp); 1471 1472 IFNET_WUNLOCK(); 1473 1474 if (new) 1475 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1476 EVENTHANDLER_INVOKE(group_change_event, groupname); 1477 1478 return (0); 1479 } 1480 1481 /* 1482 * Remove a group from an interface 1483 */ 1484 int 1485 if_delgroup(struct ifnet *ifp, const char *groupname) 1486 { 1487 struct ifg_list *ifgl; 1488 struct ifg_member *ifgm; 1489 int freeifgl; 1490 1491 IFNET_WLOCK(); 1492 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1493 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1494 break; 1495 if (ifgl == NULL) { 1496 IFNET_WUNLOCK(); 1497 return (ENOENT); 1498 } 1499 1500 freeifgl = 0; 1501 IF_ADDR_WLOCK(ifp); 1502 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1503 IF_ADDR_WUNLOCK(ifp); 1504 1505 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1506 if (ifgm->ifgm_ifp == ifp) 1507 break; 1508 1509 if (ifgm != NULL) 1510 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1511 1512 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1513 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1514 freeifgl = 1; 1515 } 1516 IFNET_WUNLOCK(); 1517 1518 epoch_wait_preempt(net_epoch_preempt); 1519 if (freeifgl) { 1520 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1521 free(ifgl->ifgl_group, M_TEMP); 1522 } 1523 free(ifgm, M_TEMP); 1524 free(ifgl, M_TEMP); 1525 1526 EVENTHANDLER_INVOKE(group_change_event, groupname); 1527 1528 return (0); 1529 } 1530 1531 /* 1532 * Remove an interface from all groups 1533 */ 1534 static void 1535 if_delgroups(struct ifnet *ifp) 1536 { 1537 struct ifg_list *ifgl; 1538 struct ifg_member *ifgm; 1539 char groupname[IFNAMSIZ]; 1540 int ifglfree; 1541 1542 IFNET_WLOCK(); 1543 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1544 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1545 1546 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1547 1548 IF_ADDR_WLOCK(ifp); 1549 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1550 IF_ADDR_WUNLOCK(ifp); 1551 1552 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1553 if (ifgm->ifgm_ifp == ifp) 1554 break; 1555 1556 if (ifgm != NULL) 1557 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1558 ifgm_next); 1559 ifglfree = 0; 1560 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1561 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1562 ifglfree = 1; 1563 } 1564 1565 IFNET_WUNLOCK(); 1566 epoch_wait_preempt(net_epoch_preempt); 1567 free(ifgm, M_TEMP); 1568 if (ifglfree) { 1569 EVENTHANDLER_INVOKE(group_detach_event, 1570 ifgl->ifgl_group); 1571 free(ifgl->ifgl_group, M_TEMP); 1572 } 1573 EVENTHANDLER_INVOKE(group_change_event, groupname); 1574 1575 IFNET_WLOCK(); 1576 } 1577 IFNET_WUNLOCK(); 1578 } 1579 1580 static char * 1581 ifgr_group_get(void *ifgrp) 1582 { 1583 union ifgroupreq_union *ifgrup; 1584 1585 ifgrup = ifgrp; 1586 #ifdef COMPAT_FREEBSD32 1587 if (SV_CURPROC_FLAG(SV_ILP32)) 1588 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1589 #endif 1590 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1591 } 1592 1593 static struct ifg_req * 1594 ifgr_groups_get(void *ifgrp) 1595 { 1596 union ifgroupreq_union *ifgrup; 1597 1598 ifgrup = ifgrp; 1599 #ifdef COMPAT_FREEBSD32 1600 if (SV_CURPROC_FLAG(SV_ILP32)) 1601 return ((struct ifg_req *)(uintptr_t) 1602 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1603 #endif 1604 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1605 } 1606 1607 /* 1608 * Stores all groups from an interface in memory pointed to by ifgr. 1609 */ 1610 static int 1611 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1612 { 1613 int len, error; 1614 struct ifg_list *ifgl; 1615 struct ifg_req ifgrq, *ifgp; 1616 1617 if (ifgr->ifgr_len == 0) { 1618 IF_ADDR_RLOCK(ifp); 1619 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1620 ifgr->ifgr_len += sizeof(struct ifg_req); 1621 IF_ADDR_RUNLOCK(ifp); 1622 return (0); 1623 } 1624 1625 len = ifgr->ifgr_len; 1626 ifgp = ifgr_groups_get(ifgr); 1627 /* XXX: wire */ 1628 IF_ADDR_RLOCK(ifp); 1629 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1630 if (len < sizeof(ifgrq)) { 1631 IF_ADDR_RUNLOCK(ifp); 1632 return (EINVAL); 1633 } 1634 bzero(&ifgrq, sizeof ifgrq); 1635 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1636 sizeof(ifgrq.ifgrq_group)); 1637 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1638 IF_ADDR_RUNLOCK(ifp); 1639 return (error); 1640 } 1641 len -= sizeof(ifgrq); 1642 ifgp++; 1643 } 1644 IF_ADDR_RUNLOCK(ifp); 1645 1646 return (0); 1647 } 1648 1649 /* 1650 * Stores all members of a group in memory pointed to by igfr 1651 */ 1652 static int 1653 if_getgroupmembers(struct ifgroupreq *ifgr) 1654 { 1655 struct ifg_group *ifg; 1656 struct ifg_member *ifgm; 1657 struct ifg_req ifgrq, *ifgp; 1658 int len, error; 1659 1660 IFNET_RLOCK(); 1661 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1662 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1663 break; 1664 if (ifg == NULL) { 1665 IFNET_RUNLOCK(); 1666 return (ENOENT); 1667 } 1668 1669 if (ifgr->ifgr_len == 0) { 1670 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1671 ifgr->ifgr_len += sizeof(ifgrq); 1672 IFNET_RUNLOCK(); 1673 return (0); 1674 } 1675 1676 len = ifgr->ifgr_len; 1677 ifgp = ifgr_groups_get(ifgr); 1678 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1679 if (len < sizeof(ifgrq)) { 1680 IFNET_RUNLOCK(); 1681 return (EINVAL); 1682 } 1683 bzero(&ifgrq, sizeof ifgrq); 1684 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1685 sizeof(ifgrq.ifgrq_member)); 1686 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1687 IFNET_RUNLOCK(); 1688 return (error); 1689 } 1690 len -= sizeof(ifgrq); 1691 ifgp++; 1692 } 1693 IFNET_RUNLOCK(); 1694 1695 return (0); 1696 } 1697 1698 /* 1699 * Return counter values from counter(9)s stored in ifnet. 1700 */ 1701 uint64_t 1702 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1703 { 1704 1705 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1706 1707 return (counter_u64_fetch(ifp->if_counters[cnt])); 1708 } 1709 1710 /* 1711 * Increase an ifnet counter. Usually used for counters shared 1712 * between the stack and a driver, but function supports them all. 1713 */ 1714 void 1715 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1716 { 1717 1718 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1719 1720 counter_u64_add(ifp->if_counters[cnt], inc); 1721 } 1722 1723 /* 1724 * Copy data from ifnet to userland API structure if_data. 1725 */ 1726 void 1727 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1728 { 1729 1730 ifd->ifi_type = ifp->if_type; 1731 ifd->ifi_physical = 0; 1732 ifd->ifi_addrlen = ifp->if_addrlen; 1733 ifd->ifi_hdrlen = ifp->if_hdrlen; 1734 ifd->ifi_link_state = ifp->if_link_state; 1735 ifd->ifi_vhid = 0; 1736 ifd->ifi_datalen = sizeof(struct if_data); 1737 ifd->ifi_mtu = ifp->if_mtu; 1738 ifd->ifi_metric = ifp->if_metric; 1739 ifd->ifi_baudrate = ifp->if_baudrate; 1740 ifd->ifi_hwassist = ifp->if_hwassist; 1741 ifd->ifi_epoch = ifp->if_epoch; 1742 ifd->ifi_lastchange = ifp->if_lastchange; 1743 1744 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1745 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1746 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1747 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1748 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1749 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1750 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1751 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1752 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1753 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1754 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1755 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1756 } 1757 1758 /* 1759 * Wrapper functions for struct ifnet address list locking macros. These are 1760 * used by kernel modules to avoid encoding programming interface or binary 1761 * interface assumptions that may be violated when kernel-internal locking 1762 * approaches change. 1763 */ 1764 void 1765 if_addr_rlock(struct ifnet *ifp) 1766 { 1767 MPASS(*(uint64_t *)&ifp->if_addr_et == 0); 1768 epoch_enter_preempt(net_epoch_preempt, &ifp->if_addr_et); 1769 } 1770 1771 void 1772 if_addr_runlock(struct ifnet *ifp) 1773 { 1774 epoch_exit_preempt(net_epoch_preempt, &ifp->if_addr_et); 1775 #ifdef INVARIANTS 1776 bzero(&ifp->if_addr_et, sizeof(struct epoch_tracker)); 1777 #endif 1778 } 1779 1780 void 1781 if_maddr_rlock(if_t ifp) 1782 { 1783 1784 MPASS(*(uint64_t *)&ifp->if_maddr_et == 0); 1785 epoch_enter_preempt(net_epoch_preempt, &ifp->if_maddr_et); 1786 } 1787 1788 void 1789 if_maddr_runlock(if_t ifp) 1790 { 1791 1792 epoch_exit_preempt(net_epoch_preempt, &ifp->if_maddr_et); 1793 #ifdef INVARIANTS 1794 bzero(&ifp->if_maddr_et, sizeof(struct epoch_tracker)); 1795 #endif 1796 } 1797 1798 /* 1799 * Initialization, destruction and refcounting functions for ifaddrs. 1800 */ 1801 struct ifaddr * 1802 ifa_alloc(size_t size, int flags) 1803 { 1804 struct ifaddr *ifa; 1805 1806 KASSERT(size >= sizeof(struct ifaddr), 1807 ("%s: invalid size %zu", __func__, size)); 1808 1809 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1810 if (ifa == NULL) 1811 return (NULL); 1812 1813 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1814 goto fail; 1815 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1816 goto fail; 1817 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1818 goto fail; 1819 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1820 goto fail; 1821 1822 refcount_init(&ifa->ifa_refcnt, 1); 1823 1824 return (ifa); 1825 1826 fail: 1827 /* free(NULL) is okay */ 1828 counter_u64_free(ifa->ifa_opackets); 1829 counter_u64_free(ifa->ifa_ipackets); 1830 counter_u64_free(ifa->ifa_obytes); 1831 counter_u64_free(ifa->ifa_ibytes); 1832 free(ifa, M_IFADDR); 1833 1834 return (NULL); 1835 } 1836 1837 void 1838 ifa_ref(struct ifaddr *ifa) 1839 { 1840 1841 refcount_acquire(&ifa->ifa_refcnt); 1842 } 1843 1844 static void 1845 ifa_destroy(epoch_context_t ctx) 1846 { 1847 struct ifaddr *ifa; 1848 1849 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1850 counter_u64_free(ifa->ifa_opackets); 1851 counter_u64_free(ifa->ifa_ipackets); 1852 counter_u64_free(ifa->ifa_obytes); 1853 counter_u64_free(ifa->ifa_ibytes); 1854 free(ifa, M_IFADDR); 1855 } 1856 1857 void 1858 ifa_free(struct ifaddr *ifa) 1859 { 1860 1861 if (refcount_release(&ifa->ifa_refcnt)) 1862 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1863 } 1864 1865 1866 static int 1867 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1868 struct sockaddr *ia) 1869 { 1870 int error; 1871 struct rt_addrinfo info; 1872 struct sockaddr_dl null_sdl; 1873 struct ifnet *ifp; 1874 1875 ifp = ifa->ifa_ifp; 1876 1877 bzero(&info, sizeof(info)); 1878 if (cmd != RTM_DELETE) 1879 info.rti_ifp = V_loif; 1880 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1881 info.rti_info[RTAX_DST] = ia; 1882 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1883 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1884 1885 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1886 1887 if (error != 0 && 1888 !(cmd == RTM_ADD && error == EEXIST) && 1889 !(cmd == RTM_DELETE && error == ENOENT)) 1890 if_printf(ifp, "%s failed: %d\n", otype, error); 1891 1892 return (error); 1893 } 1894 1895 int 1896 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1897 { 1898 1899 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1900 } 1901 1902 int 1903 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1904 { 1905 1906 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1907 } 1908 1909 int 1910 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1911 { 1912 1913 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1914 } 1915 1916 /* 1917 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1918 * structs used to represent other address families, it is necessary 1919 * to perform a different comparison. 1920 */ 1921 1922 #define sa_dl_equal(a1, a2) \ 1923 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1924 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1925 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1926 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1927 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1928 1929 /* 1930 * Locate an interface based on a complete address. 1931 */ 1932 /*ARGSUSED*/ 1933 struct ifaddr * 1934 ifa_ifwithaddr(const struct sockaddr *addr) 1935 { 1936 struct ifnet *ifp; 1937 struct ifaddr *ifa; 1938 1939 MPASS(in_epoch(net_epoch_preempt)); 1940 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1941 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1942 if (ifa->ifa_addr->sa_family != addr->sa_family) 1943 continue; 1944 if (sa_equal(addr, ifa->ifa_addr)) { 1945 goto done; 1946 } 1947 /* IP6 doesn't have broadcast */ 1948 if ((ifp->if_flags & IFF_BROADCAST) && 1949 ifa->ifa_broadaddr && 1950 ifa->ifa_broadaddr->sa_len != 0 && 1951 sa_equal(ifa->ifa_broadaddr, addr)) { 1952 goto done; 1953 } 1954 } 1955 } 1956 ifa = NULL; 1957 done: 1958 return (ifa); 1959 } 1960 1961 int 1962 ifa_ifwithaddr_check(const struct sockaddr *addr) 1963 { 1964 int rc; 1965 1966 NET_EPOCH_ENTER(); 1967 rc = (ifa_ifwithaddr(addr) != NULL); 1968 NET_EPOCH_EXIT(); 1969 return (rc); 1970 } 1971 1972 /* 1973 * Locate an interface based on the broadcast address. 1974 */ 1975 /* ARGSUSED */ 1976 struct ifaddr * 1977 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1978 { 1979 struct ifnet *ifp; 1980 struct ifaddr *ifa; 1981 1982 MPASS(in_epoch(net_epoch_preempt)); 1983 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1984 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1985 continue; 1986 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1987 if (ifa->ifa_addr->sa_family != addr->sa_family) 1988 continue; 1989 if ((ifp->if_flags & IFF_BROADCAST) && 1990 ifa->ifa_broadaddr && 1991 ifa->ifa_broadaddr->sa_len != 0 && 1992 sa_equal(ifa->ifa_broadaddr, addr)) { 1993 goto done; 1994 } 1995 } 1996 } 1997 ifa = NULL; 1998 done: 1999 return (ifa); 2000 } 2001 2002 /* 2003 * Locate the point to point interface with a given destination address. 2004 */ 2005 /*ARGSUSED*/ 2006 struct ifaddr * 2007 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2008 { 2009 struct ifnet *ifp; 2010 struct ifaddr *ifa; 2011 2012 MPASS(in_epoch(net_epoch_preempt)); 2013 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2014 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2015 continue; 2016 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2017 continue; 2018 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2019 if (ifa->ifa_addr->sa_family != addr->sa_family) 2020 continue; 2021 if (ifa->ifa_dstaddr != NULL && 2022 sa_equal(addr, ifa->ifa_dstaddr)) { 2023 goto done; 2024 } 2025 } 2026 } 2027 ifa = NULL; 2028 done: 2029 return (ifa); 2030 } 2031 2032 /* 2033 * Find an interface on a specific network. If many, choice 2034 * is most specific found. 2035 */ 2036 struct ifaddr * 2037 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2038 { 2039 struct ifnet *ifp; 2040 struct ifaddr *ifa; 2041 struct ifaddr *ifa_maybe = NULL; 2042 u_int af = addr->sa_family; 2043 const char *addr_data = addr->sa_data, *cplim; 2044 2045 MPASS(in_epoch(net_epoch_preempt)); 2046 /* 2047 * AF_LINK addresses can be looked up directly by their index number, 2048 * so do that if we can. 2049 */ 2050 if (af == AF_LINK) { 2051 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2052 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2053 return (ifaddr_byindex(sdl->sdl_index)); 2054 } 2055 2056 /* 2057 * Scan though each interface, looking for ones that have addresses 2058 * in this address family and the requested fib. Maintain a reference 2059 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 2060 * kept it stable when we move onto the next interface. 2061 */ 2062 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2063 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2064 continue; 2065 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2066 const char *cp, *cp2, *cp3; 2067 2068 if (ifa->ifa_addr->sa_family != af) 2069 next: continue; 2070 if (af == AF_INET && 2071 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2072 /* 2073 * This is a bit broken as it doesn't 2074 * take into account that the remote end may 2075 * be a single node in the network we are 2076 * looking for. 2077 * The trouble is that we don't know the 2078 * netmask for the remote end. 2079 */ 2080 if (ifa->ifa_dstaddr != NULL && 2081 sa_equal(addr, ifa->ifa_dstaddr)) { 2082 goto done; 2083 } 2084 } else { 2085 /* 2086 * Scan all the bits in the ifa's address. 2087 * If a bit dissagrees with what we are 2088 * looking for, mask it with the netmask 2089 * to see if it really matters. 2090 * (A byte at a time) 2091 */ 2092 if (ifa->ifa_netmask == 0) 2093 continue; 2094 cp = addr_data; 2095 cp2 = ifa->ifa_addr->sa_data; 2096 cp3 = ifa->ifa_netmask->sa_data; 2097 cplim = ifa->ifa_netmask->sa_len 2098 + (char *)ifa->ifa_netmask; 2099 while (cp3 < cplim) 2100 if ((*cp++ ^ *cp2++) & *cp3++) 2101 goto next; /* next address! */ 2102 /* 2103 * If the netmask of what we just found 2104 * is more specific than what we had before 2105 * (if we had one), or if the virtual status 2106 * of new prefix is better than of the old one, 2107 * then remember the new one before continuing 2108 * to search for an even better one. 2109 */ 2110 if (ifa_maybe == NULL || 2111 ifa_preferred(ifa_maybe, ifa) || 2112 rn_refines((caddr_t)ifa->ifa_netmask, 2113 (caddr_t)ifa_maybe->ifa_netmask)) { 2114 ifa_maybe = ifa; 2115 } 2116 } 2117 } 2118 } 2119 ifa = ifa_maybe; 2120 ifa_maybe = NULL; 2121 done: 2122 return (ifa); 2123 } 2124 2125 /* 2126 * Find an interface address specific to an interface best matching 2127 * a given address. 2128 */ 2129 struct ifaddr * 2130 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2131 { 2132 struct ifaddr *ifa; 2133 const char *cp, *cp2, *cp3; 2134 char *cplim; 2135 struct ifaddr *ifa_maybe = NULL; 2136 u_int af = addr->sa_family; 2137 2138 if (af >= AF_MAX) 2139 return (NULL); 2140 2141 MPASS(in_epoch(net_epoch_preempt)); 2142 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2143 if (ifa->ifa_addr->sa_family != af) 2144 continue; 2145 if (ifa_maybe == NULL) 2146 ifa_maybe = ifa; 2147 if (ifa->ifa_netmask == 0) { 2148 if (sa_equal(addr, ifa->ifa_addr) || 2149 (ifa->ifa_dstaddr && 2150 sa_equal(addr, ifa->ifa_dstaddr))) 2151 goto done; 2152 continue; 2153 } 2154 if (ifp->if_flags & IFF_POINTOPOINT) { 2155 if (sa_equal(addr, ifa->ifa_dstaddr)) 2156 goto done; 2157 } else { 2158 cp = addr->sa_data; 2159 cp2 = ifa->ifa_addr->sa_data; 2160 cp3 = ifa->ifa_netmask->sa_data; 2161 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2162 for (; cp3 < cplim; cp3++) 2163 if ((*cp++ ^ *cp2++) & *cp3) 2164 break; 2165 if (cp3 == cplim) 2166 goto done; 2167 } 2168 } 2169 ifa = ifa_maybe; 2170 done: 2171 return (ifa); 2172 } 2173 2174 /* 2175 * See whether new ifa is better than current one: 2176 * 1) A non-virtual one is preferred over virtual. 2177 * 2) A virtual in master state preferred over any other state. 2178 * 2179 * Used in several address selecting functions. 2180 */ 2181 int 2182 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2183 { 2184 2185 return (cur->ifa_carp && (!next->ifa_carp || 2186 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2187 } 2188 2189 #include <net/if_llatbl.h> 2190 2191 /* 2192 * Default action when installing a route with a Link Level gateway. 2193 * Lookup an appropriate real ifa to point to. 2194 * This should be moved to /sys/net/link.c eventually. 2195 */ 2196 static void 2197 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 2198 { 2199 struct ifaddr *ifa, *oifa; 2200 struct sockaddr *dst; 2201 struct ifnet *ifp; 2202 2203 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 2204 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_key(rt)) == NULL)) 2205 return; 2206 NET_EPOCH_ENTER(); 2207 ifa = ifaof_ifpforaddr(dst, ifp); 2208 if (ifa) { 2209 oifa = rt->rt_ifa; 2210 if (oifa != ifa) { 2211 ifa_free(oifa); 2212 ifa_ref(ifa); 2213 } 2214 rt->rt_ifa = ifa; 2215 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2216 ifa->ifa_rtrequest(cmd, rt, info); 2217 } 2218 NET_EPOCH_EXIT(); 2219 } 2220 2221 struct sockaddr_dl * 2222 link_alloc_sdl(size_t size, int flags) 2223 { 2224 2225 return (malloc(size, M_TEMP, flags)); 2226 } 2227 2228 void 2229 link_free_sdl(struct sockaddr *sa) 2230 { 2231 free(sa, M_TEMP); 2232 } 2233 2234 /* 2235 * Fills in given sdl with interface basic info. 2236 * Returns pointer to filled sdl. 2237 */ 2238 struct sockaddr_dl * 2239 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2240 { 2241 struct sockaddr_dl *sdl; 2242 2243 sdl = (struct sockaddr_dl *)paddr; 2244 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2245 sdl->sdl_len = sizeof(struct sockaddr_dl); 2246 sdl->sdl_family = AF_LINK; 2247 sdl->sdl_index = ifp->if_index; 2248 sdl->sdl_type = iftype; 2249 2250 return (sdl); 2251 } 2252 2253 /* 2254 * Mark an interface down and notify protocols of 2255 * the transition. 2256 */ 2257 static void 2258 if_unroute(struct ifnet *ifp, int flag, int fam) 2259 { 2260 struct ifaddr *ifa; 2261 2262 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2263 2264 ifp->if_flags &= ~flag; 2265 getmicrotime(&ifp->if_lastchange); 2266 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2267 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2268 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2269 ifp->if_qflush(ifp); 2270 2271 if (ifp->if_carp) 2272 (*carp_linkstate_p)(ifp); 2273 rt_ifmsg(ifp); 2274 } 2275 2276 /* 2277 * Mark an interface up and notify protocols of 2278 * the transition. 2279 */ 2280 static void 2281 if_route(struct ifnet *ifp, int flag, int fam) 2282 { 2283 struct ifaddr *ifa; 2284 2285 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2286 2287 ifp->if_flags |= flag; 2288 getmicrotime(&ifp->if_lastchange); 2289 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2290 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2291 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2292 if (ifp->if_carp) 2293 (*carp_linkstate_p)(ifp); 2294 rt_ifmsg(ifp); 2295 #ifdef INET6 2296 in6_if_up(ifp); 2297 #endif 2298 } 2299 2300 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2301 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2302 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2303 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2304 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2305 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2306 int (*vlan_setcookie_p)(struct ifnet *, void *); 2307 void *(*vlan_cookie_p)(struct ifnet *); 2308 2309 /* 2310 * Handle a change in the interface link state. To avoid LORs 2311 * between driver lock and upper layer locks, as well as possible 2312 * recursions, we post event to taskqueue, and all job 2313 * is done in static do_link_state_change(). 2314 */ 2315 void 2316 if_link_state_change(struct ifnet *ifp, int link_state) 2317 { 2318 /* Return if state hasn't changed. */ 2319 if (ifp->if_link_state == link_state) 2320 return; 2321 2322 ifp->if_link_state = link_state; 2323 2324 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2325 } 2326 2327 static void 2328 do_link_state_change(void *arg, int pending) 2329 { 2330 struct ifnet *ifp = (struct ifnet *)arg; 2331 int link_state = ifp->if_link_state; 2332 CURVNET_SET(ifp->if_vnet); 2333 2334 /* Notify that the link state has changed. */ 2335 rt_ifmsg(ifp); 2336 if (ifp->if_vlantrunk != NULL) 2337 (*vlan_link_state_p)(ifp); 2338 2339 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2340 ifp->if_l2com != NULL) 2341 (*ng_ether_link_state_p)(ifp, link_state); 2342 if (ifp->if_carp) 2343 (*carp_linkstate_p)(ifp); 2344 if (ifp->if_bridge) 2345 ifp->if_bridge_linkstate(ifp); 2346 if (ifp->if_lagg) 2347 (*lagg_linkstate_p)(ifp, link_state); 2348 2349 if (IS_DEFAULT_VNET(curvnet)) 2350 devctl_notify("IFNET", ifp->if_xname, 2351 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2352 NULL); 2353 if (pending > 1) 2354 if_printf(ifp, "%d link states coalesced\n", pending); 2355 if (log_link_state_change) 2356 if_printf(ifp, "link state changed to %s\n", 2357 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2358 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2359 CURVNET_RESTORE(); 2360 } 2361 2362 /* 2363 * Mark an interface down and notify protocols of 2364 * the transition. 2365 */ 2366 void 2367 if_down(struct ifnet *ifp) 2368 { 2369 2370 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2371 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2372 } 2373 2374 /* 2375 * Mark an interface up and notify protocols of 2376 * the transition. 2377 */ 2378 void 2379 if_up(struct ifnet *ifp) 2380 { 2381 2382 if_route(ifp, IFF_UP, AF_UNSPEC); 2383 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2384 } 2385 2386 /* 2387 * Flush an interface queue. 2388 */ 2389 void 2390 if_qflush(struct ifnet *ifp) 2391 { 2392 struct mbuf *m, *n; 2393 struct ifaltq *ifq; 2394 2395 ifq = &ifp->if_snd; 2396 IFQ_LOCK(ifq); 2397 #ifdef ALTQ 2398 if (ALTQ_IS_ENABLED(ifq)) 2399 ALTQ_PURGE(ifq); 2400 #endif 2401 n = ifq->ifq_head; 2402 while ((m = n) != NULL) { 2403 n = m->m_nextpkt; 2404 m_freem(m); 2405 } 2406 ifq->ifq_head = 0; 2407 ifq->ifq_tail = 0; 2408 ifq->ifq_len = 0; 2409 IFQ_UNLOCK(ifq); 2410 } 2411 2412 /* 2413 * Map interface name to interface structure pointer, with or without 2414 * returning a reference. 2415 */ 2416 struct ifnet * 2417 ifunit_ref(const char *name) 2418 { 2419 struct ifnet *ifp; 2420 2421 IFNET_RLOCK_NOSLEEP(); 2422 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2423 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2424 !(ifp->if_flags & IFF_DYING)) 2425 break; 2426 } 2427 if (ifp != NULL) 2428 if_ref(ifp); 2429 IFNET_RUNLOCK_NOSLEEP(); 2430 return (ifp); 2431 } 2432 2433 struct ifnet * 2434 ifunit(const char *name) 2435 { 2436 struct ifnet *ifp; 2437 2438 IFNET_RLOCK_NOSLEEP(); 2439 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2440 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2441 break; 2442 } 2443 IFNET_RUNLOCK_NOSLEEP(); 2444 return (ifp); 2445 } 2446 2447 static void * 2448 ifr_buffer_get_buffer(void *data) 2449 { 2450 union ifreq_union *ifrup; 2451 2452 ifrup = data; 2453 #ifdef COMPAT_FREEBSD32 2454 if (SV_CURPROC_FLAG(SV_ILP32)) 2455 return ((void *)(uintptr_t) 2456 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2457 #endif 2458 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2459 } 2460 2461 static void 2462 ifr_buffer_set_buffer_null(void *data) 2463 { 2464 union ifreq_union *ifrup; 2465 2466 ifrup = data; 2467 #ifdef COMPAT_FREEBSD32 2468 if (SV_CURPROC_FLAG(SV_ILP32)) 2469 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2470 else 2471 #endif 2472 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2473 } 2474 2475 static size_t 2476 ifr_buffer_get_length(void *data) 2477 { 2478 union ifreq_union *ifrup; 2479 2480 ifrup = data; 2481 #ifdef COMPAT_FREEBSD32 2482 if (SV_CURPROC_FLAG(SV_ILP32)) 2483 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2484 #endif 2485 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2486 } 2487 2488 static void 2489 ifr_buffer_set_length(void *data, size_t len) 2490 { 2491 union ifreq_union *ifrup; 2492 2493 ifrup = data; 2494 #ifdef COMPAT_FREEBSD32 2495 if (SV_CURPROC_FLAG(SV_ILP32)) 2496 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2497 else 2498 #endif 2499 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2500 } 2501 2502 void * 2503 ifr_data_get_ptr(void *ifrp) 2504 { 2505 union ifreq_union *ifrup; 2506 2507 ifrup = ifrp; 2508 #ifdef COMPAT_FREEBSD32 2509 if (SV_CURPROC_FLAG(SV_ILP32)) 2510 return ((void *)(uintptr_t) 2511 ifrup->ifr32.ifr_ifru.ifru_data); 2512 #endif 2513 return (ifrup->ifr.ifr_ifru.ifru_data); 2514 } 2515 2516 /* 2517 * Hardware specific interface ioctls. 2518 */ 2519 int 2520 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2521 { 2522 struct ifreq *ifr; 2523 int error = 0, do_ifup = 0; 2524 int new_flags, temp_flags; 2525 size_t namelen, onamelen; 2526 size_t descrlen; 2527 char *descrbuf, *odescrbuf; 2528 char new_name[IFNAMSIZ]; 2529 struct ifaddr *ifa; 2530 struct sockaddr_dl *sdl; 2531 2532 ifr = (struct ifreq *)data; 2533 switch (cmd) { 2534 case SIOCGIFINDEX: 2535 ifr->ifr_index = ifp->if_index; 2536 break; 2537 2538 case SIOCGIFFLAGS: 2539 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2540 ifr->ifr_flags = temp_flags & 0xffff; 2541 ifr->ifr_flagshigh = temp_flags >> 16; 2542 break; 2543 2544 case SIOCGIFCAP: 2545 ifr->ifr_reqcap = ifp->if_capabilities; 2546 ifr->ifr_curcap = ifp->if_capenable; 2547 break; 2548 2549 #ifdef MAC 2550 case SIOCGIFMAC: 2551 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2552 break; 2553 #endif 2554 2555 case SIOCGIFMETRIC: 2556 ifr->ifr_metric = ifp->if_metric; 2557 break; 2558 2559 case SIOCGIFMTU: 2560 ifr->ifr_mtu = ifp->if_mtu; 2561 break; 2562 2563 case SIOCGIFPHYS: 2564 /* XXXGL: did this ever worked? */ 2565 ifr->ifr_phys = 0; 2566 break; 2567 2568 case SIOCGIFDESCR: 2569 error = 0; 2570 sx_slock(&ifdescr_sx); 2571 if (ifp->if_description == NULL) 2572 error = ENOMSG; 2573 else { 2574 /* space for terminating nul */ 2575 descrlen = strlen(ifp->if_description) + 1; 2576 if (ifr_buffer_get_length(ifr) < descrlen) 2577 ifr_buffer_set_buffer_null(ifr); 2578 else 2579 error = copyout(ifp->if_description, 2580 ifr_buffer_get_buffer(ifr), descrlen); 2581 ifr_buffer_set_length(ifr, descrlen); 2582 } 2583 sx_sunlock(&ifdescr_sx); 2584 break; 2585 2586 case SIOCSIFDESCR: 2587 error = priv_check(td, PRIV_NET_SETIFDESCR); 2588 if (error) 2589 return (error); 2590 2591 /* 2592 * Copy only (length-1) bytes to make sure that 2593 * if_description is always nul terminated. The 2594 * length parameter is supposed to count the 2595 * terminating nul in. 2596 */ 2597 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2598 return (ENAMETOOLONG); 2599 else if (ifr_buffer_get_length(ifr) == 0) 2600 descrbuf = NULL; 2601 else { 2602 descrbuf = malloc(ifr_buffer_get_length(ifr), 2603 M_IFDESCR, M_WAITOK | M_ZERO); 2604 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2605 ifr_buffer_get_length(ifr) - 1); 2606 if (error) { 2607 free(descrbuf, M_IFDESCR); 2608 break; 2609 } 2610 } 2611 2612 sx_xlock(&ifdescr_sx); 2613 odescrbuf = ifp->if_description; 2614 ifp->if_description = descrbuf; 2615 sx_xunlock(&ifdescr_sx); 2616 2617 getmicrotime(&ifp->if_lastchange); 2618 free(odescrbuf, M_IFDESCR); 2619 break; 2620 2621 case SIOCGIFFIB: 2622 ifr->ifr_fib = ifp->if_fib; 2623 break; 2624 2625 case SIOCSIFFIB: 2626 error = priv_check(td, PRIV_NET_SETIFFIB); 2627 if (error) 2628 return (error); 2629 if (ifr->ifr_fib >= rt_numfibs) 2630 return (EINVAL); 2631 2632 ifp->if_fib = ifr->ifr_fib; 2633 break; 2634 2635 case SIOCSIFFLAGS: 2636 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2637 if (error) 2638 return (error); 2639 /* 2640 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2641 * check, so we don't need special handling here yet. 2642 */ 2643 new_flags = (ifr->ifr_flags & 0xffff) | 2644 (ifr->ifr_flagshigh << 16); 2645 if (ifp->if_flags & IFF_UP && 2646 (new_flags & IFF_UP) == 0) { 2647 if_down(ifp); 2648 } else if (new_flags & IFF_UP && 2649 (ifp->if_flags & IFF_UP) == 0) { 2650 do_ifup = 1; 2651 } 2652 /* See if permanently promiscuous mode bit is about to flip */ 2653 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2654 if (new_flags & IFF_PPROMISC) 2655 ifp->if_flags |= IFF_PROMISC; 2656 else if (ifp->if_pcount == 0) 2657 ifp->if_flags &= ~IFF_PROMISC; 2658 if (log_promisc_mode_change) 2659 if_printf(ifp, "permanently promiscuous mode %s\n", 2660 ((new_flags & IFF_PPROMISC) ? 2661 "enabled" : "disabled")); 2662 } 2663 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2664 (new_flags &~ IFF_CANTCHANGE); 2665 if (ifp->if_ioctl) { 2666 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2667 } 2668 if (do_ifup) 2669 if_up(ifp); 2670 getmicrotime(&ifp->if_lastchange); 2671 break; 2672 2673 case SIOCSIFCAP: 2674 error = priv_check(td, PRIV_NET_SETIFCAP); 2675 if (error) 2676 return (error); 2677 if (ifp->if_ioctl == NULL) 2678 return (EOPNOTSUPP); 2679 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2680 return (EINVAL); 2681 error = (*ifp->if_ioctl)(ifp, cmd, data); 2682 if (error == 0) 2683 getmicrotime(&ifp->if_lastchange); 2684 break; 2685 2686 #ifdef MAC 2687 case SIOCSIFMAC: 2688 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2689 break; 2690 #endif 2691 2692 case SIOCSIFNAME: 2693 error = priv_check(td, PRIV_NET_SETIFNAME); 2694 if (error) 2695 return (error); 2696 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2697 NULL); 2698 if (error != 0) 2699 return (error); 2700 if (new_name[0] == '\0') 2701 return (EINVAL); 2702 if (new_name[IFNAMSIZ-1] != '\0') { 2703 new_name[IFNAMSIZ-1] = '\0'; 2704 if (strlen(new_name) == IFNAMSIZ-1) 2705 return (EINVAL); 2706 } 2707 if (ifunit(new_name) != NULL) 2708 return (EEXIST); 2709 2710 /* 2711 * XXX: Locking. Nothing else seems to lock if_flags, 2712 * and there are numerous other races with the 2713 * ifunit() checks not being atomic with namespace 2714 * changes (renames, vmoves, if_attach, etc). 2715 */ 2716 ifp->if_flags |= IFF_RENAMING; 2717 2718 /* Announce the departure of the interface. */ 2719 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2720 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2721 2722 if_printf(ifp, "changing name to '%s'\n", new_name); 2723 2724 IF_ADDR_WLOCK(ifp); 2725 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2726 ifa = ifp->if_addr; 2727 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2728 namelen = strlen(new_name); 2729 onamelen = sdl->sdl_nlen; 2730 /* 2731 * Move the address if needed. This is safe because we 2732 * allocate space for a name of length IFNAMSIZ when we 2733 * create this in if_attach(). 2734 */ 2735 if (namelen != onamelen) { 2736 bcopy(sdl->sdl_data + onamelen, 2737 sdl->sdl_data + namelen, sdl->sdl_alen); 2738 } 2739 bcopy(new_name, sdl->sdl_data, namelen); 2740 sdl->sdl_nlen = namelen; 2741 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2742 bzero(sdl->sdl_data, onamelen); 2743 while (namelen != 0) 2744 sdl->sdl_data[--namelen] = 0xff; 2745 IF_ADDR_WUNLOCK(ifp); 2746 2747 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2748 /* Announce the return of the interface. */ 2749 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2750 2751 ifp->if_flags &= ~IFF_RENAMING; 2752 break; 2753 2754 #ifdef VIMAGE 2755 case SIOCSIFVNET: 2756 error = priv_check(td, PRIV_NET_SETIFVNET); 2757 if (error) 2758 return (error); 2759 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2760 break; 2761 #endif 2762 2763 case SIOCSIFMETRIC: 2764 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2765 if (error) 2766 return (error); 2767 ifp->if_metric = ifr->ifr_metric; 2768 getmicrotime(&ifp->if_lastchange); 2769 break; 2770 2771 case SIOCSIFPHYS: 2772 error = priv_check(td, PRIV_NET_SETIFPHYS); 2773 if (error) 2774 return (error); 2775 if (ifp->if_ioctl == NULL) 2776 return (EOPNOTSUPP); 2777 error = (*ifp->if_ioctl)(ifp, cmd, data); 2778 if (error == 0) 2779 getmicrotime(&ifp->if_lastchange); 2780 break; 2781 2782 case SIOCSIFMTU: 2783 { 2784 u_long oldmtu = ifp->if_mtu; 2785 2786 error = priv_check(td, PRIV_NET_SETIFMTU); 2787 if (error) 2788 return (error); 2789 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2790 return (EINVAL); 2791 if (ifp->if_ioctl == NULL) 2792 return (EOPNOTSUPP); 2793 error = (*ifp->if_ioctl)(ifp, cmd, data); 2794 if (error == 0) { 2795 getmicrotime(&ifp->if_lastchange); 2796 rt_ifmsg(ifp); 2797 #ifdef INET 2798 NETDUMP_REINIT(ifp); 2799 #endif 2800 } 2801 /* 2802 * If the link MTU changed, do network layer specific procedure. 2803 */ 2804 if (ifp->if_mtu != oldmtu) { 2805 #ifdef INET6 2806 nd6_setmtu(ifp); 2807 #endif 2808 rt_updatemtu(ifp); 2809 } 2810 break; 2811 } 2812 2813 case SIOCADDMULTI: 2814 case SIOCDELMULTI: 2815 if (cmd == SIOCADDMULTI) 2816 error = priv_check(td, PRIV_NET_ADDMULTI); 2817 else 2818 error = priv_check(td, PRIV_NET_DELMULTI); 2819 if (error) 2820 return (error); 2821 2822 /* Don't allow group membership on non-multicast interfaces. */ 2823 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2824 return (EOPNOTSUPP); 2825 2826 /* Don't let users screw up protocols' entries. */ 2827 if (ifr->ifr_addr.sa_family != AF_LINK) 2828 return (EINVAL); 2829 2830 if (cmd == SIOCADDMULTI) { 2831 struct ifmultiaddr *ifma; 2832 2833 /* 2834 * Userland is only permitted to join groups once 2835 * via the if_addmulti() KPI, because it cannot hold 2836 * struct ifmultiaddr * between calls. It may also 2837 * lose a race while we check if the membership 2838 * already exists. 2839 */ 2840 IF_ADDR_RLOCK(ifp); 2841 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2842 IF_ADDR_RUNLOCK(ifp); 2843 if (ifma != NULL) 2844 error = EADDRINUSE; 2845 else 2846 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2847 } else { 2848 error = if_delmulti(ifp, &ifr->ifr_addr); 2849 } 2850 if (error == 0) 2851 getmicrotime(&ifp->if_lastchange); 2852 break; 2853 2854 case SIOCSIFPHYADDR: 2855 case SIOCDIFPHYADDR: 2856 #ifdef INET6 2857 case SIOCSIFPHYADDR_IN6: 2858 #endif 2859 case SIOCSIFMEDIA: 2860 case SIOCSIFGENERIC: 2861 error = priv_check(td, PRIV_NET_HWIOCTL); 2862 if (error) 2863 return (error); 2864 if (ifp->if_ioctl == NULL) 2865 return (EOPNOTSUPP); 2866 error = (*ifp->if_ioctl)(ifp, cmd, data); 2867 if (error == 0) 2868 getmicrotime(&ifp->if_lastchange); 2869 break; 2870 2871 case SIOCGIFSTATUS: 2872 case SIOCGIFPSRCADDR: 2873 case SIOCGIFPDSTADDR: 2874 case SIOCGIFMEDIA: 2875 case SIOCGIFXMEDIA: 2876 case SIOCGIFGENERIC: 2877 case SIOCGIFRSSKEY: 2878 case SIOCGIFRSSHASH: 2879 if (ifp->if_ioctl == NULL) 2880 return (EOPNOTSUPP); 2881 error = (*ifp->if_ioctl)(ifp, cmd, data); 2882 break; 2883 2884 case SIOCSIFLLADDR: 2885 error = priv_check(td, PRIV_NET_SETLLADDR); 2886 if (error) 2887 return (error); 2888 error = if_setlladdr(ifp, 2889 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2890 break; 2891 2892 case SIOCGHWADDR: 2893 error = if_gethwaddr(ifp, ifr); 2894 break; 2895 2896 CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2897 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2898 if (error) 2899 return (error); 2900 if ((error = if_addgroup(ifp, 2901 ifgr_group_get((struct ifgroupreq *)data)))) 2902 return (error); 2903 break; 2904 2905 CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2906 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2907 return (error); 2908 break; 2909 2910 CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2911 error = priv_check(td, PRIV_NET_DELIFGROUP); 2912 if (error) 2913 return (error); 2914 if ((error = if_delgroup(ifp, 2915 ifgr_group_get((struct ifgroupreq *)data)))) 2916 return (error); 2917 break; 2918 2919 default: 2920 error = ENOIOCTL; 2921 break; 2922 } 2923 return (error); 2924 } 2925 2926 #ifdef COMPAT_FREEBSD32 2927 struct ifconf32 { 2928 int32_t ifc_len; 2929 union { 2930 uint32_t ifcu_buf; 2931 uint32_t ifcu_req; 2932 } ifc_ifcu; 2933 }; 2934 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2935 #endif 2936 2937 #ifdef COMPAT_FREEBSD32 2938 static void 2939 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2940 { 2941 struct ifmediareq32 *ifmr32; 2942 2943 ifmr32 = (struct ifmediareq32 *)data; 2944 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2945 sizeof(ifmr->ifm_name)); 2946 ifmr->ifm_current = ifmr32->ifm_current; 2947 ifmr->ifm_mask = ifmr32->ifm_mask; 2948 ifmr->ifm_status = ifmr32->ifm_status; 2949 ifmr->ifm_active = ifmr32->ifm_active; 2950 ifmr->ifm_count = ifmr32->ifm_count; 2951 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2952 } 2953 2954 static void 2955 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2956 { 2957 struct ifmediareq32 *ifmr32; 2958 2959 ifmr32 = (struct ifmediareq32 *)data; 2960 ifmr32->ifm_current = ifmr->ifm_current; 2961 ifmr32->ifm_mask = ifmr->ifm_mask; 2962 ifmr32->ifm_status = ifmr->ifm_status; 2963 ifmr32->ifm_active = ifmr->ifm_active; 2964 ifmr32->ifm_count = ifmr->ifm_count; 2965 } 2966 #endif 2967 2968 /* 2969 * Interface ioctls. 2970 */ 2971 int 2972 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2973 { 2974 #ifdef COMPAT_FREEBSD32 2975 caddr_t saved_data = NULL; 2976 struct ifmediareq ifmr; 2977 struct ifmediareq *ifmrp; 2978 #endif 2979 struct ifnet *ifp; 2980 struct ifreq *ifr; 2981 int error; 2982 int oif_flags; 2983 #ifdef VIMAGE 2984 int shutdown; 2985 #endif 2986 2987 CURVNET_SET(so->so_vnet); 2988 #ifdef VIMAGE 2989 /* Make sure the VNET is stable. */ 2990 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 2991 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 2992 if (shutdown) { 2993 CURVNET_RESTORE(); 2994 return (EBUSY); 2995 } 2996 #endif 2997 2998 2999 switch (cmd) { 3000 case SIOCGIFCONF: 3001 error = ifconf(cmd, data); 3002 CURVNET_RESTORE(); 3003 return (error); 3004 3005 #ifdef COMPAT_FREEBSD32 3006 case SIOCGIFCONF32: 3007 { 3008 struct ifconf32 *ifc32; 3009 struct ifconf ifc; 3010 3011 ifc32 = (struct ifconf32 *)data; 3012 ifc.ifc_len = ifc32->ifc_len; 3013 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3014 3015 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3016 CURVNET_RESTORE(); 3017 if (error == 0) 3018 ifc32->ifc_len = ifc.ifc_len; 3019 return (error); 3020 } 3021 #endif 3022 } 3023 3024 #ifdef COMPAT_FREEBSD32 3025 ifmrp = NULL; 3026 switch (cmd) { 3027 case SIOCGIFMEDIA32: 3028 case SIOCGIFXMEDIA32: 3029 ifmrp = &ifmr; 3030 ifmr_init(ifmrp, data); 3031 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3032 saved_data = data; 3033 data = (caddr_t)ifmrp; 3034 } 3035 #endif 3036 3037 ifr = (struct ifreq *)data; 3038 switch (cmd) { 3039 #ifdef VIMAGE 3040 case SIOCSIFRVNET: 3041 error = priv_check(td, PRIV_NET_SETIFVNET); 3042 if (error == 0) 3043 error = if_vmove_reclaim(td, ifr->ifr_name, 3044 ifr->ifr_jid); 3045 goto out_noref; 3046 #endif 3047 case SIOCIFCREATE: 3048 case SIOCIFCREATE2: 3049 error = priv_check(td, PRIV_NET_IFCREATE); 3050 if (error == 0) 3051 error = if_clone_create(ifr->ifr_name, 3052 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3053 ifr_data_get_ptr(ifr) : NULL); 3054 goto out_noref; 3055 case SIOCIFDESTROY: 3056 error = priv_check(td, PRIV_NET_IFDESTROY); 3057 if (error == 0) 3058 error = if_clone_destroy(ifr->ifr_name); 3059 goto out_noref; 3060 3061 case SIOCIFGCLONERS: 3062 error = if_clone_list((struct if_clonereq *)data); 3063 goto out_noref; 3064 3065 CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3066 error = if_getgroupmembers((struct ifgroupreq *)data); 3067 goto out_noref; 3068 3069 #if defined(INET) || defined(INET6) 3070 case SIOCSVH: 3071 case SIOCGVH: 3072 if (carp_ioctl_p == NULL) 3073 error = EPROTONOSUPPORT; 3074 else 3075 error = (*carp_ioctl_p)(ifr, cmd, td); 3076 goto out_noref; 3077 #endif 3078 } 3079 3080 ifp = ifunit_ref(ifr->ifr_name); 3081 if (ifp == NULL) { 3082 error = ENXIO; 3083 goto out_noref; 3084 } 3085 3086 error = ifhwioctl(cmd, ifp, data, td); 3087 if (error != ENOIOCTL) 3088 goto out_ref; 3089 3090 oif_flags = ifp->if_flags; 3091 if (so->so_proto == NULL) { 3092 error = EOPNOTSUPP; 3093 goto out_ref; 3094 } 3095 3096 /* 3097 * Pass the request on to the socket control method, and if the 3098 * latter returns EOPNOTSUPP, directly to the interface. 3099 * 3100 * Make an exception for the legacy SIOCSIF* requests. Drivers 3101 * trust SIOCSIFADDR et al to come from an already privileged 3102 * layer, and do not perform any credentials checks or input 3103 * validation. 3104 */ 3105 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3106 ifp, td)); 3107 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3108 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3109 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3110 error = (*ifp->if_ioctl)(ifp, cmd, data); 3111 3112 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3113 #ifdef INET6 3114 if (ifp->if_flags & IFF_UP) 3115 in6_if_up(ifp); 3116 #endif 3117 } 3118 3119 out_ref: 3120 if_rele(ifp); 3121 out_noref: 3122 #ifdef COMPAT_FREEBSD32 3123 if (ifmrp != NULL) { 3124 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3125 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3126 cmd)); 3127 data = saved_data; 3128 ifmr_update(ifmrp, data); 3129 } 3130 #endif 3131 CURVNET_RESTORE(); 3132 return (error); 3133 } 3134 3135 /* 3136 * The code common to handling reference counted flags, 3137 * e.g., in ifpromisc() and if_allmulti(). 3138 * The "pflag" argument can specify a permanent mode flag to check, 3139 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3140 * 3141 * Only to be used on stack-owned flags, not driver-owned flags. 3142 */ 3143 static int 3144 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3145 { 3146 struct ifreq ifr; 3147 int error; 3148 int oldflags, oldcount; 3149 3150 /* Sanity checks to catch programming errors */ 3151 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3152 ("%s: setting driver-owned flag %d", __func__, flag)); 3153 3154 if (onswitch) 3155 KASSERT(*refcount >= 0, 3156 ("%s: increment negative refcount %d for flag %d", 3157 __func__, *refcount, flag)); 3158 else 3159 KASSERT(*refcount > 0, 3160 ("%s: decrement non-positive refcount %d for flag %d", 3161 __func__, *refcount, flag)); 3162 3163 /* In case this mode is permanent, just touch refcount */ 3164 if (ifp->if_flags & pflag) { 3165 *refcount += onswitch ? 1 : -1; 3166 return (0); 3167 } 3168 3169 /* Save ifnet parameters for if_ioctl() may fail */ 3170 oldcount = *refcount; 3171 oldflags = ifp->if_flags; 3172 3173 /* 3174 * See if we aren't the only and touching refcount is enough. 3175 * Actually toggle interface flag if we are the first or last. 3176 */ 3177 if (onswitch) { 3178 if ((*refcount)++) 3179 return (0); 3180 ifp->if_flags |= flag; 3181 } else { 3182 if (--(*refcount)) 3183 return (0); 3184 ifp->if_flags &= ~flag; 3185 } 3186 3187 /* Call down the driver since we've changed interface flags */ 3188 if (ifp->if_ioctl == NULL) { 3189 error = EOPNOTSUPP; 3190 goto recover; 3191 } 3192 ifr.ifr_flags = ifp->if_flags & 0xffff; 3193 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3194 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3195 if (error) 3196 goto recover; 3197 /* Notify userland that interface flags have changed */ 3198 rt_ifmsg(ifp); 3199 return (0); 3200 3201 recover: 3202 /* Recover after driver error */ 3203 *refcount = oldcount; 3204 ifp->if_flags = oldflags; 3205 return (error); 3206 } 3207 3208 /* 3209 * Set/clear promiscuous mode on interface ifp based on the truth value 3210 * of pswitch. The calls are reference counted so that only the first 3211 * "on" request actually has an effect, as does the final "off" request. 3212 * Results are undefined if the "off" and "on" requests are not matched. 3213 */ 3214 int 3215 ifpromisc(struct ifnet *ifp, int pswitch) 3216 { 3217 int error; 3218 int oldflags = ifp->if_flags; 3219 3220 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3221 &ifp->if_pcount, pswitch); 3222 /* If promiscuous mode status has changed, log a message */ 3223 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3224 log_promisc_mode_change) 3225 if_printf(ifp, "promiscuous mode %s\n", 3226 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3227 return (error); 3228 } 3229 3230 /* 3231 * Return interface configuration 3232 * of system. List may be used 3233 * in later ioctl's (above) to get 3234 * other information. 3235 */ 3236 /*ARGSUSED*/ 3237 static int 3238 ifconf(u_long cmd, caddr_t data) 3239 { 3240 struct ifconf *ifc = (struct ifconf *)data; 3241 struct ifnet *ifp; 3242 struct ifaddr *ifa; 3243 struct ifreq ifr; 3244 struct sbuf *sb; 3245 int error, full = 0, valid_len, max_len; 3246 3247 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3248 max_len = MAXPHYS - 1; 3249 3250 /* Prevent hostile input from being able to crash the system */ 3251 if (ifc->ifc_len <= 0) 3252 return (EINVAL); 3253 3254 again: 3255 if (ifc->ifc_len <= max_len) { 3256 max_len = ifc->ifc_len; 3257 full = 1; 3258 } 3259 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3260 max_len = 0; 3261 valid_len = 0; 3262 3263 IFNET_RLOCK(); 3264 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3265 int addrs; 3266 3267 /* 3268 * Zero the ifr to make sure we don't disclose the contents 3269 * of the stack. 3270 */ 3271 memset(&ifr, 0, sizeof(ifr)); 3272 3273 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3274 >= sizeof(ifr.ifr_name)) { 3275 sbuf_delete(sb); 3276 IFNET_RUNLOCK(); 3277 return (ENAMETOOLONG); 3278 } 3279 3280 addrs = 0; 3281 IF_ADDR_RLOCK(ifp); 3282 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3283 struct sockaddr *sa = ifa->ifa_addr; 3284 3285 if (prison_if(curthread->td_ucred, sa) != 0) 3286 continue; 3287 addrs++; 3288 if (sa->sa_len <= sizeof(*sa)) { 3289 if (sa->sa_len < sizeof(*sa)) { 3290 memset(&ifr.ifr_ifru.ifru_addr, 0, 3291 sizeof(ifr.ifr_ifru.ifru_addr)); 3292 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3293 sa->sa_len); 3294 } else 3295 ifr.ifr_ifru.ifru_addr = *sa; 3296 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3297 max_len += sizeof(ifr); 3298 } else { 3299 sbuf_bcat(sb, &ifr, 3300 offsetof(struct ifreq, ifr_addr)); 3301 max_len += offsetof(struct ifreq, ifr_addr); 3302 sbuf_bcat(sb, sa, sa->sa_len); 3303 max_len += sa->sa_len; 3304 } 3305 3306 if (sbuf_error(sb) == 0) 3307 valid_len = sbuf_len(sb); 3308 } 3309 IF_ADDR_RUNLOCK(ifp); 3310 if (addrs == 0) { 3311 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3312 max_len += sizeof(ifr); 3313 3314 if (sbuf_error(sb) == 0) 3315 valid_len = sbuf_len(sb); 3316 } 3317 } 3318 IFNET_RUNLOCK(); 3319 3320 /* 3321 * If we didn't allocate enough space (uncommon), try again. If 3322 * we have already allocated as much space as we are allowed, 3323 * return what we've got. 3324 */ 3325 if (valid_len != max_len && !full) { 3326 sbuf_delete(sb); 3327 goto again; 3328 } 3329 3330 ifc->ifc_len = valid_len; 3331 sbuf_finish(sb); 3332 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3333 sbuf_delete(sb); 3334 return (error); 3335 } 3336 3337 /* 3338 * Just like ifpromisc(), but for all-multicast-reception mode. 3339 */ 3340 int 3341 if_allmulti(struct ifnet *ifp, int onswitch) 3342 { 3343 3344 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3345 } 3346 3347 struct ifmultiaddr * 3348 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3349 { 3350 struct ifmultiaddr *ifma; 3351 3352 IF_ADDR_LOCK_ASSERT(ifp); 3353 3354 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3355 if (sa->sa_family == AF_LINK) { 3356 if (sa_dl_equal(ifma->ifma_addr, sa)) 3357 break; 3358 } else { 3359 if (sa_equal(ifma->ifma_addr, sa)) 3360 break; 3361 } 3362 } 3363 3364 return ifma; 3365 } 3366 3367 /* 3368 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3369 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3370 * the ifnet multicast address list here, so the caller must do that and 3371 * other setup work (such as notifying the device driver). The reference 3372 * count is initialized to 1. 3373 */ 3374 static struct ifmultiaddr * 3375 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3376 int mflags) 3377 { 3378 struct ifmultiaddr *ifma; 3379 struct sockaddr *dupsa; 3380 3381 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3382 M_ZERO); 3383 if (ifma == NULL) 3384 return (NULL); 3385 3386 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3387 if (dupsa == NULL) { 3388 free(ifma, M_IFMADDR); 3389 return (NULL); 3390 } 3391 bcopy(sa, dupsa, sa->sa_len); 3392 ifma->ifma_addr = dupsa; 3393 3394 ifma->ifma_ifp = ifp; 3395 ifma->ifma_refcount = 1; 3396 ifma->ifma_protospec = NULL; 3397 3398 if (llsa == NULL) { 3399 ifma->ifma_lladdr = NULL; 3400 return (ifma); 3401 } 3402 3403 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3404 if (dupsa == NULL) { 3405 free(ifma->ifma_addr, M_IFMADDR); 3406 free(ifma, M_IFMADDR); 3407 return (NULL); 3408 } 3409 bcopy(llsa, dupsa, llsa->sa_len); 3410 ifma->ifma_lladdr = dupsa; 3411 3412 return (ifma); 3413 } 3414 3415 /* 3416 * if_freemulti: free ifmultiaddr structure and possibly attached related 3417 * addresses. The caller is responsible for implementing reference 3418 * counting, notifying the driver, handling routing messages, and releasing 3419 * any dependent link layer state. 3420 */ 3421 #ifdef MCAST_VERBOSE 3422 extern void kdb_backtrace(void); 3423 #endif 3424 static void 3425 if_freemulti_internal(struct ifmultiaddr *ifma) 3426 { 3427 3428 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3429 ifma->ifma_refcount)); 3430 3431 if (ifma->ifma_lladdr != NULL) 3432 free(ifma->ifma_lladdr, M_IFMADDR); 3433 #ifdef MCAST_VERBOSE 3434 kdb_backtrace(); 3435 printf("%s freeing ifma: %p\n", __func__, ifma); 3436 #endif 3437 free(ifma->ifma_addr, M_IFMADDR); 3438 free(ifma, M_IFMADDR); 3439 } 3440 3441 static void 3442 if_destroymulti(epoch_context_t ctx) 3443 { 3444 struct ifmultiaddr *ifma; 3445 3446 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3447 if_freemulti_internal(ifma); 3448 } 3449 3450 void 3451 if_freemulti(struct ifmultiaddr *ifma) 3452 { 3453 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3454 ifma->ifma_refcount)); 3455 3456 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3457 } 3458 3459 3460 /* 3461 * Register an additional multicast address with a network interface. 3462 * 3463 * - If the address is already present, bump the reference count on the 3464 * address and return. 3465 * - If the address is not link-layer, look up a link layer address. 3466 * - Allocate address structures for one or both addresses, and attach to the 3467 * multicast address list on the interface. If automatically adding a link 3468 * layer address, the protocol address will own a reference to the link 3469 * layer address, to be freed when it is freed. 3470 * - Notify the network device driver of an addition to the multicast address 3471 * list. 3472 * 3473 * 'sa' points to caller-owned memory with the desired multicast address. 3474 * 3475 * 'retifma' will be used to return a pointer to the resulting multicast 3476 * address reference, if desired. 3477 */ 3478 int 3479 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3480 struct ifmultiaddr **retifma) 3481 { 3482 struct ifmultiaddr *ifma, *ll_ifma; 3483 struct sockaddr *llsa; 3484 struct sockaddr_dl sdl; 3485 int error; 3486 3487 #ifdef INET 3488 IN_MULTI_LIST_UNLOCK_ASSERT(); 3489 #endif 3490 #ifdef INET6 3491 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3492 #endif 3493 /* 3494 * If the address is already present, return a new reference to it; 3495 * otherwise, allocate storage and set up a new address. 3496 */ 3497 IF_ADDR_WLOCK(ifp); 3498 ifma = if_findmulti(ifp, sa); 3499 if (ifma != NULL) { 3500 ifma->ifma_refcount++; 3501 if (retifma != NULL) 3502 *retifma = ifma; 3503 IF_ADDR_WUNLOCK(ifp); 3504 return (0); 3505 } 3506 3507 /* 3508 * The address isn't already present; resolve the protocol address 3509 * into a link layer address, and then look that up, bump its 3510 * refcount or allocate an ifma for that also. 3511 * Most link layer resolving functions returns address data which 3512 * fits inside default sockaddr_dl structure. However callback 3513 * can allocate another sockaddr structure, in that case we need to 3514 * free it later. 3515 */ 3516 llsa = NULL; 3517 ll_ifma = NULL; 3518 if (ifp->if_resolvemulti != NULL) { 3519 /* Provide called function with buffer size information */ 3520 sdl.sdl_len = sizeof(sdl); 3521 llsa = (struct sockaddr *)&sdl; 3522 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3523 if (error) 3524 goto unlock_out; 3525 } 3526 3527 /* 3528 * Allocate the new address. Don't hook it up yet, as we may also 3529 * need to allocate a link layer multicast address. 3530 */ 3531 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3532 if (ifma == NULL) { 3533 error = ENOMEM; 3534 goto free_llsa_out; 3535 } 3536 3537 /* 3538 * If a link layer address is found, we'll need to see if it's 3539 * already present in the address list, or allocate is as well. 3540 * When this block finishes, the link layer address will be on the 3541 * list. 3542 */ 3543 if (llsa != NULL) { 3544 ll_ifma = if_findmulti(ifp, llsa); 3545 if (ll_ifma == NULL) { 3546 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3547 if (ll_ifma == NULL) { 3548 --ifma->ifma_refcount; 3549 if_freemulti(ifma); 3550 error = ENOMEM; 3551 goto free_llsa_out; 3552 } 3553 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3554 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3555 ifma_link); 3556 } else 3557 ll_ifma->ifma_refcount++; 3558 ifma->ifma_llifma = ll_ifma; 3559 } 3560 3561 /* 3562 * We now have a new multicast address, ifma, and possibly a new or 3563 * referenced link layer address. Add the primary address to the 3564 * ifnet address list. 3565 */ 3566 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3567 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3568 3569 if (retifma != NULL) 3570 *retifma = ifma; 3571 3572 /* 3573 * Must generate the message while holding the lock so that 'ifma' 3574 * pointer is still valid. 3575 */ 3576 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3577 IF_ADDR_WUNLOCK(ifp); 3578 3579 /* 3580 * We are certain we have added something, so call down to the 3581 * interface to let them know about it. 3582 */ 3583 if (ifp->if_ioctl != NULL) { 3584 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3585 } 3586 3587 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3588 link_free_sdl(llsa); 3589 3590 return (0); 3591 3592 free_llsa_out: 3593 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3594 link_free_sdl(llsa); 3595 3596 unlock_out: 3597 IF_ADDR_WUNLOCK(ifp); 3598 return (error); 3599 } 3600 3601 /* 3602 * Delete a multicast group membership by network-layer group address. 3603 * 3604 * Returns ENOENT if the entry could not be found. If ifp no longer 3605 * exists, results are undefined. This entry point should only be used 3606 * from subsystems which do appropriate locking to hold ifp for the 3607 * duration of the call. 3608 * Network-layer protocol domains must use if_delmulti_ifma(). 3609 */ 3610 int 3611 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3612 { 3613 struct ifmultiaddr *ifma; 3614 int lastref; 3615 #ifdef INVARIANTS 3616 struct ifnet *oifp; 3617 3618 IFNET_RLOCK_NOSLEEP(); 3619 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3620 if (ifp == oifp) 3621 break; 3622 if (ifp != oifp) 3623 ifp = NULL; 3624 IFNET_RUNLOCK_NOSLEEP(); 3625 3626 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3627 #endif 3628 if (ifp == NULL) 3629 return (ENOENT); 3630 3631 IF_ADDR_WLOCK(ifp); 3632 lastref = 0; 3633 ifma = if_findmulti(ifp, sa); 3634 if (ifma != NULL) 3635 lastref = if_delmulti_locked(ifp, ifma, 0); 3636 IF_ADDR_WUNLOCK(ifp); 3637 3638 if (ifma == NULL) 3639 return (ENOENT); 3640 3641 if (lastref && ifp->if_ioctl != NULL) { 3642 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3643 } 3644 3645 return (0); 3646 } 3647 3648 /* 3649 * Delete all multicast group membership for an interface. 3650 * Should be used to quickly flush all multicast filters. 3651 */ 3652 void 3653 if_delallmulti(struct ifnet *ifp) 3654 { 3655 struct ifmultiaddr *ifma; 3656 struct ifmultiaddr *next; 3657 3658 IF_ADDR_WLOCK(ifp); 3659 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3660 if_delmulti_locked(ifp, ifma, 0); 3661 IF_ADDR_WUNLOCK(ifp); 3662 } 3663 3664 void 3665 if_delmulti_ifma(struct ifmultiaddr *ifma) 3666 { 3667 if_delmulti_ifma_flags(ifma, 0); 3668 } 3669 3670 /* 3671 * Delete a multicast group membership by group membership pointer. 3672 * Network-layer protocol domains must use this routine. 3673 * 3674 * It is safe to call this routine if the ifp disappeared. 3675 */ 3676 void 3677 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3678 { 3679 struct ifnet *ifp; 3680 int lastref; 3681 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3682 #ifdef INET 3683 IN_MULTI_LIST_UNLOCK_ASSERT(); 3684 #endif 3685 ifp = ifma->ifma_ifp; 3686 #ifdef DIAGNOSTIC 3687 if (ifp == NULL) { 3688 printf("%s: ifma_ifp seems to be detached\n", __func__); 3689 } else { 3690 struct ifnet *oifp; 3691 3692 IFNET_RLOCK_NOSLEEP(); 3693 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3694 if (ifp == oifp) 3695 break; 3696 if (ifp != oifp) 3697 ifp = NULL; 3698 IFNET_RUNLOCK_NOSLEEP(); 3699 } 3700 #endif 3701 /* 3702 * If and only if the ifnet instance exists: Acquire the address lock. 3703 */ 3704 if (ifp != NULL) 3705 IF_ADDR_WLOCK(ifp); 3706 3707 lastref = if_delmulti_locked(ifp, ifma, flags); 3708 3709 if (ifp != NULL) { 3710 /* 3711 * If and only if the ifnet instance exists: 3712 * Release the address lock. 3713 * If the group was left: update the hardware hash filter. 3714 */ 3715 IF_ADDR_WUNLOCK(ifp); 3716 if (lastref && ifp->if_ioctl != NULL) { 3717 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3718 } 3719 } 3720 } 3721 3722 /* 3723 * Perform deletion of network-layer and/or link-layer multicast address. 3724 * 3725 * Return 0 if the reference count was decremented. 3726 * Return 1 if the final reference was released, indicating that the 3727 * hardware hash filter should be reprogrammed. 3728 */ 3729 static int 3730 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3731 { 3732 struct ifmultiaddr *ll_ifma; 3733 3734 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3735 KASSERT(ifma->ifma_ifp == ifp, 3736 ("%s: inconsistent ifp %p", __func__, ifp)); 3737 IF_ADDR_WLOCK_ASSERT(ifp); 3738 } 3739 3740 ifp = ifma->ifma_ifp; 3741 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3742 3743 /* 3744 * If the ifnet is detaching, null out references to ifnet, 3745 * so that upper protocol layers will notice, and not attempt 3746 * to obtain locks for an ifnet which no longer exists. The 3747 * routing socket announcement must happen before the ifnet 3748 * instance is detached from the system. 3749 */ 3750 if (detaching) { 3751 #ifdef DIAGNOSTIC 3752 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3753 #endif 3754 /* 3755 * ifp may already be nulled out if we are being reentered 3756 * to delete the ll_ifma. 3757 */ 3758 if (ifp != NULL) { 3759 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3760 ifma->ifma_ifp = NULL; 3761 } 3762 } 3763 3764 if (--ifma->ifma_refcount > 0) 3765 return 0; 3766 3767 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3768 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3769 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3770 } 3771 /* 3772 * If this ifma is a network-layer ifma, a link-layer ifma may 3773 * have been associated with it. Release it first if so. 3774 */ 3775 ll_ifma = ifma->ifma_llifma; 3776 if (ll_ifma != NULL) { 3777 KASSERT(ifma->ifma_lladdr != NULL, 3778 ("%s: llifma w/o lladdr", __func__)); 3779 if (detaching) 3780 ll_ifma->ifma_ifp = NULL; /* XXX */ 3781 if (--ll_ifma->ifma_refcount == 0) { 3782 if (ifp != NULL) { 3783 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3784 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3785 ifma_link); 3786 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3787 } 3788 } 3789 if_freemulti(ll_ifma); 3790 } 3791 } 3792 #ifdef INVARIANTS 3793 if (ifp) { 3794 struct ifmultiaddr *ifmatmp; 3795 3796 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3797 MPASS(ifma != ifmatmp); 3798 } 3799 #endif 3800 if_freemulti(ifma); 3801 /* 3802 * The last reference to this instance of struct ifmultiaddr 3803 * was released; the hardware should be notified of this change. 3804 */ 3805 return 1; 3806 } 3807 3808 /* 3809 * Set the link layer address on an interface. 3810 * 3811 * At this time we only support certain types of interfaces, 3812 * and we don't allow the length of the address to change. 3813 * 3814 * Set noinline to be dtrace-friendly 3815 */ 3816 __noinline int 3817 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3818 { 3819 struct sockaddr_dl *sdl; 3820 struct ifaddr *ifa; 3821 struct ifreq ifr; 3822 int rc; 3823 3824 rc = 0; 3825 NET_EPOCH_ENTER(); 3826 ifa = ifp->if_addr; 3827 if (ifa == NULL) { 3828 rc = EINVAL; 3829 goto out; 3830 } 3831 3832 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3833 if (sdl == NULL) { 3834 rc = EINVAL; 3835 goto out; 3836 } 3837 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3838 rc = EINVAL; 3839 goto out; 3840 } 3841 switch (ifp->if_type) { 3842 case IFT_ETHER: 3843 case IFT_XETHER: 3844 case IFT_L2VLAN: 3845 case IFT_BRIDGE: 3846 case IFT_IEEE8023ADLAG: 3847 bcopy(lladdr, LLADDR(sdl), len); 3848 break; 3849 default: 3850 rc = ENODEV; 3851 goto out; 3852 } 3853 3854 /* 3855 * If the interface is already up, we need 3856 * to re-init it in order to reprogram its 3857 * address filter. 3858 */ 3859 NET_EPOCH_EXIT(); 3860 if ((ifp->if_flags & IFF_UP) != 0) { 3861 if (ifp->if_ioctl) { 3862 ifp->if_flags &= ~IFF_UP; 3863 ifr.ifr_flags = ifp->if_flags & 0xffff; 3864 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3865 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3866 ifp->if_flags |= IFF_UP; 3867 ifr.ifr_flags = ifp->if_flags & 0xffff; 3868 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3869 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3870 } 3871 } 3872 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3873 return (0); 3874 out: 3875 NET_EPOCH_EXIT(); 3876 return (rc); 3877 } 3878 3879 /* 3880 * Compat function for handling basic encapsulation requests. 3881 * Not converted stacks (FDDI, IB, ..) supports traditional 3882 * output model: ARP (and other similar L2 protocols) are handled 3883 * inside output routine, arpresolve/nd6_resolve() returns MAC 3884 * address instead of full prepend. 3885 * 3886 * This function creates calculated header==MAC for IPv4/IPv6 and 3887 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3888 * address families. 3889 */ 3890 static int 3891 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3892 { 3893 3894 if (req->rtype != IFENCAP_LL) 3895 return (EOPNOTSUPP); 3896 3897 if (req->bufsize < req->lladdr_len) 3898 return (ENOMEM); 3899 3900 switch (req->family) { 3901 case AF_INET: 3902 case AF_INET6: 3903 break; 3904 default: 3905 return (EAFNOSUPPORT); 3906 } 3907 3908 /* Copy lladdr to storage as is */ 3909 memmove(req->buf, req->lladdr, req->lladdr_len); 3910 req->bufsize = req->lladdr_len; 3911 req->lladdr_off = 0; 3912 3913 return (0); 3914 } 3915 3916 /* 3917 * Tunnel interfaces can nest, also they may cause infinite recursion 3918 * calls when misconfigured. We'll prevent this by detecting loops. 3919 * High nesting level may cause stack exhaustion. We'll prevent this 3920 * by introducing upper limit. 3921 * 3922 * Return 0, if tunnel nesting count is equal or less than limit. 3923 */ 3924 int 3925 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3926 int limit) 3927 { 3928 struct m_tag *mtag; 3929 int count; 3930 3931 count = 1; 3932 mtag = NULL; 3933 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3934 if (*(struct ifnet **)(mtag + 1) == ifp) { 3935 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3936 return (EIO); 3937 } 3938 count++; 3939 } 3940 if (count > limit) { 3941 log(LOG_NOTICE, 3942 "%s: if_output recursively called too many times(%d)\n", 3943 if_name(ifp), count); 3944 return (EIO); 3945 } 3946 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3947 if (mtag == NULL) 3948 return (ENOMEM); 3949 *(struct ifnet **)(mtag + 1) = ifp; 3950 m_tag_prepend(m, mtag); 3951 return (0); 3952 } 3953 3954 /* 3955 * Get the link layer address that was read from the hardware at attach. 3956 * 3957 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3958 * their component interfaces as IFT_IEEE8023ADLAG. 3959 */ 3960 int 3961 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3962 { 3963 3964 if (ifp->if_hw_addr == NULL) 3965 return (ENODEV); 3966 3967 switch (ifp->if_type) { 3968 case IFT_ETHER: 3969 case IFT_IEEE8023ADLAG: 3970 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3971 return (0); 3972 default: 3973 return (ENODEV); 3974 } 3975 } 3976 3977 /* 3978 * The name argument must be a pointer to storage which will last as 3979 * long as the interface does. For physical devices, the result of 3980 * device_get_name(dev) is a good choice and for pseudo-devices a 3981 * static string works well. 3982 */ 3983 void 3984 if_initname(struct ifnet *ifp, const char *name, int unit) 3985 { 3986 ifp->if_dname = name; 3987 ifp->if_dunit = unit; 3988 if (unit != IF_DUNIT_NONE) 3989 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3990 else 3991 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3992 } 3993 3994 int 3995 if_printf(struct ifnet *ifp, const char *fmt, ...) 3996 { 3997 char if_fmt[256]; 3998 va_list ap; 3999 4000 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 4001 va_start(ap, fmt); 4002 vlog(LOG_INFO, if_fmt, ap); 4003 va_end(ap); 4004 return (0); 4005 } 4006 4007 void 4008 if_start(struct ifnet *ifp) 4009 { 4010 4011 (*(ifp)->if_start)(ifp); 4012 } 4013 4014 /* 4015 * Backwards compatibility interface for drivers 4016 * that have not implemented it 4017 */ 4018 static int 4019 if_transmit(struct ifnet *ifp, struct mbuf *m) 4020 { 4021 int error; 4022 4023 IFQ_HANDOFF(ifp, m, error); 4024 return (error); 4025 } 4026 4027 static void 4028 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4029 { 4030 4031 m_freem(m); 4032 } 4033 4034 int 4035 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4036 { 4037 int active = 0; 4038 4039 IF_LOCK(ifq); 4040 if (_IF_QFULL(ifq)) { 4041 IF_UNLOCK(ifq); 4042 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4043 m_freem(m); 4044 return (0); 4045 } 4046 if (ifp != NULL) { 4047 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4048 if (m->m_flags & (M_BCAST|M_MCAST)) 4049 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4050 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4051 } 4052 _IF_ENQUEUE(ifq, m); 4053 IF_UNLOCK(ifq); 4054 if (ifp != NULL && !active) 4055 (*(ifp)->if_start)(ifp); 4056 return (1); 4057 } 4058 4059 void 4060 if_register_com_alloc(u_char type, 4061 if_com_alloc_t *a, if_com_free_t *f) 4062 { 4063 4064 KASSERT(if_com_alloc[type] == NULL, 4065 ("if_register_com_alloc: %d already registered", type)); 4066 KASSERT(if_com_free[type] == NULL, 4067 ("if_register_com_alloc: %d free already registered", type)); 4068 4069 if_com_alloc[type] = a; 4070 if_com_free[type] = f; 4071 } 4072 4073 void 4074 if_deregister_com_alloc(u_char type) 4075 { 4076 4077 KASSERT(if_com_alloc[type] != NULL, 4078 ("if_deregister_com_alloc: %d not registered", type)); 4079 KASSERT(if_com_free[type] != NULL, 4080 ("if_deregister_com_alloc: %d free not registered", type)); 4081 if_com_alloc[type] = NULL; 4082 if_com_free[type] = NULL; 4083 } 4084 4085 /* API for driver access to network stack owned ifnet.*/ 4086 uint64_t 4087 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4088 { 4089 uint64_t oldbrate; 4090 4091 oldbrate = ifp->if_baudrate; 4092 ifp->if_baudrate = baudrate; 4093 return (oldbrate); 4094 } 4095 4096 uint64_t 4097 if_getbaudrate(if_t ifp) 4098 { 4099 4100 return (((struct ifnet *)ifp)->if_baudrate); 4101 } 4102 4103 int 4104 if_setcapabilities(if_t ifp, int capabilities) 4105 { 4106 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4107 return (0); 4108 } 4109 4110 int 4111 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4112 { 4113 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4114 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4115 4116 return (0); 4117 } 4118 4119 int 4120 if_getcapabilities(if_t ifp) 4121 { 4122 return ((struct ifnet *)ifp)->if_capabilities; 4123 } 4124 4125 int 4126 if_setcapenable(if_t ifp, int capabilities) 4127 { 4128 ((struct ifnet *)ifp)->if_capenable = capabilities; 4129 return (0); 4130 } 4131 4132 int 4133 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4134 { 4135 if(setcap) 4136 ((struct ifnet *)ifp)->if_capenable |= setcap; 4137 if(clearcap) 4138 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4139 4140 return (0); 4141 } 4142 4143 const char * 4144 if_getdname(if_t ifp) 4145 { 4146 return ((struct ifnet *)ifp)->if_dname; 4147 } 4148 4149 int 4150 if_togglecapenable(if_t ifp, int togglecap) 4151 { 4152 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4153 return (0); 4154 } 4155 4156 int 4157 if_getcapenable(if_t ifp) 4158 { 4159 return ((struct ifnet *)ifp)->if_capenable; 4160 } 4161 4162 /* 4163 * This is largely undesirable because it ties ifnet to a device, but does 4164 * provide flexiblity for an embedded product vendor. Should be used with 4165 * the understanding that it violates the interface boundaries, and should be 4166 * a last resort only. 4167 */ 4168 int 4169 if_setdev(if_t ifp, void *dev) 4170 { 4171 return (0); 4172 } 4173 4174 int 4175 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4176 { 4177 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4178 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4179 4180 return (0); 4181 } 4182 4183 int 4184 if_getdrvflags(if_t ifp) 4185 { 4186 return ((struct ifnet *)ifp)->if_drv_flags; 4187 } 4188 4189 int 4190 if_setdrvflags(if_t ifp, int flags) 4191 { 4192 ((struct ifnet *)ifp)->if_drv_flags = flags; 4193 return (0); 4194 } 4195 4196 4197 int 4198 if_setflags(if_t ifp, int flags) 4199 { 4200 ((struct ifnet *)ifp)->if_flags = flags; 4201 return (0); 4202 } 4203 4204 int 4205 if_setflagbits(if_t ifp, int set, int clear) 4206 { 4207 ((struct ifnet *)ifp)->if_flags |= set; 4208 ((struct ifnet *)ifp)->if_flags &= ~clear; 4209 4210 return (0); 4211 } 4212 4213 int 4214 if_getflags(if_t ifp) 4215 { 4216 return ((struct ifnet *)ifp)->if_flags; 4217 } 4218 4219 int 4220 if_clearhwassist(if_t ifp) 4221 { 4222 ((struct ifnet *)ifp)->if_hwassist = 0; 4223 return (0); 4224 } 4225 4226 int 4227 if_sethwassistbits(if_t ifp, int toset, int toclear) 4228 { 4229 ((struct ifnet *)ifp)->if_hwassist |= toset; 4230 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4231 4232 return (0); 4233 } 4234 4235 int 4236 if_sethwassist(if_t ifp, int hwassist_bit) 4237 { 4238 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4239 return (0); 4240 } 4241 4242 int 4243 if_gethwassist(if_t ifp) 4244 { 4245 return ((struct ifnet *)ifp)->if_hwassist; 4246 } 4247 4248 int 4249 if_setmtu(if_t ifp, int mtu) 4250 { 4251 ((struct ifnet *)ifp)->if_mtu = mtu; 4252 return (0); 4253 } 4254 4255 int 4256 if_getmtu(if_t ifp) 4257 { 4258 return ((struct ifnet *)ifp)->if_mtu; 4259 } 4260 4261 int 4262 if_getmtu_family(if_t ifp, int family) 4263 { 4264 struct domain *dp; 4265 4266 for (dp = domains; dp; dp = dp->dom_next) { 4267 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4268 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4269 } 4270 4271 return (((struct ifnet *)ifp)->if_mtu); 4272 } 4273 4274 int 4275 if_setsoftc(if_t ifp, void *softc) 4276 { 4277 ((struct ifnet *)ifp)->if_softc = softc; 4278 return (0); 4279 } 4280 4281 void * 4282 if_getsoftc(if_t ifp) 4283 { 4284 return ((struct ifnet *)ifp)->if_softc; 4285 } 4286 4287 void 4288 if_setrcvif(struct mbuf *m, if_t ifp) 4289 { 4290 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4291 } 4292 4293 void 4294 if_setvtag(struct mbuf *m, uint16_t tag) 4295 { 4296 m->m_pkthdr.ether_vtag = tag; 4297 } 4298 4299 uint16_t 4300 if_getvtag(struct mbuf *m) 4301 { 4302 4303 return (m->m_pkthdr.ether_vtag); 4304 } 4305 4306 int 4307 if_sendq_empty(if_t ifp) 4308 { 4309 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4310 } 4311 4312 struct ifaddr * 4313 if_getifaddr(if_t ifp) 4314 { 4315 return ((struct ifnet *)ifp)->if_addr; 4316 } 4317 4318 int 4319 if_getamcount(if_t ifp) 4320 { 4321 return ((struct ifnet *)ifp)->if_amcount; 4322 } 4323 4324 4325 int 4326 if_setsendqready(if_t ifp) 4327 { 4328 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4329 return (0); 4330 } 4331 4332 int 4333 if_setsendqlen(if_t ifp, int tx_desc_count) 4334 { 4335 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4336 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4337 4338 return (0); 4339 } 4340 4341 int 4342 if_vlantrunkinuse(if_t ifp) 4343 { 4344 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4345 } 4346 4347 int 4348 if_input(if_t ifp, struct mbuf* sendmp) 4349 { 4350 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4351 return (0); 4352 4353 } 4354 4355 /* XXX */ 4356 #ifndef ETH_ADDR_LEN 4357 #define ETH_ADDR_LEN 6 4358 #endif 4359 4360 int 4361 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4362 { 4363 struct ifmultiaddr *ifma; 4364 uint8_t *lmta = (uint8_t *)mta; 4365 int mcnt = 0; 4366 4367 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4368 if (ifma->ifma_addr->sa_family != AF_LINK) 4369 continue; 4370 4371 if (mcnt == max) 4372 break; 4373 4374 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4375 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4376 mcnt++; 4377 } 4378 *cnt = mcnt; 4379 4380 return (0); 4381 } 4382 4383 int 4384 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4385 { 4386 int error; 4387 4388 if_maddr_rlock(ifp); 4389 error = if_setupmultiaddr(ifp, mta, cnt, max); 4390 if_maddr_runlock(ifp); 4391 return (error); 4392 } 4393 4394 int 4395 if_multiaddr_count(if_t ifp, int max) 4396 { 4397 struct ifmultiaddr *ifma; 4398 int count; 4399 4400 count = 0; 4401 if_maddr_rlock(ifp); 4402 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4403 if (ifma->ifma_addr->sa_family != AF_LINK) 4404 continue; 4405 count++; 4406 if (count == max) 4407 break; 4408 } 4409 if_maddr_runlock(ifp); 4410 return (count); 4411 } 4412 4413 int 4414 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4415 { 4416 struct ifmultiaddr *ifma; 4417 int cnt = 0; 4418 4419 if_maddr_rlock(ifp); 4420 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4421 cnt += filter(arg, ifma, cnt); 4422 if_maddr_runlock(ifp); 4423 return (cnt); 4424 } 4425 4426 struct mbuf * 4427 if_dequeue(if_t ifp) 4428 { 4429 struct mbuf *m; 4430 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4431 4432 return (m); 4433 } 4434 4435 int 4436 if_sendq_prepend(if_t ifp, struct mbuf *m) 4437 { 4438 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4439 return (0); 4440 } 4441 4442 int 4443 if_setifheaderlen(if_t ifp, int len) 4444 { 4445 ((struct ifnet *)ifp)->if_hdrlen = len; 4446 return (0); 4447 } 4448 4449 caddr_t 4450 if_getlladdr(if_t ifp) 4451 { 4452 return (IF_LLADDR((struct ifnet *)ifp)); 4453 } 4454 4455 void * 4456 if_gethandle(u_char type) 4457 { 4458 return (if_alloc(type)); 4459 } 4460 4461 void 4462 if_bpfmtap(if_t ifh, struct mbuf *m) 4463 { 4464 struct ifnet *ifp = (struct ifnet *)ifh; 4465 4466 BPF_MTAP(ifp, m); 4467 } 4468 4469 void 4470 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4471 { 4472 struct ifnet *ifp = (struct ifnet *)ifh; 4473 4474 ETHER_BPF_MTAP(ifp, m); 4475 } 4476 4477 void 4478 if_vlancap(if_t ifh) 4479 { 4480 struct ifnet *ifp = (struct ifnet *)ifh; 4481 VLAN_CAPABILITIES(ifp); 4482 } 4483 4484 int 4485 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4486 { 4487 4488 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4489 return (0); 4490 } 4491 4492 int 4493 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4494 { 4495 4496 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4497 return (0); 4498 } 4499 4500 int 4501 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4502 { 4503 4504 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4505 return (0); 4506 } 4507 4508 u_int 4509 if_gethwtsomax(if_t ifp) 4510 { 4511 4512 return (((struct ifnet *)ifp)->if_hw_tsomax); 4513 } 4514 4515 u_int 4516 if_gethwtsomaxsegcount(if_t ifp) 4517 { 4518 4519 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4520 } 4521 4522 u_int 4523 if_gethwtsomaxsegsize(if_t ifp) 4524 { 4525 4526 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4527 } 4528 4529 void 4530 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4531 { 4532 ((struct ifnet *)ifp)->if_init = init_fn; 4533 } 4534 4535 void 4536 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4537 { 4538 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4539 } 4540 4541 void 4542 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4543 { 4544 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4545 } 4546 4547 void 4548 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4549 { 4550 ((struct ifnet *)ifp)->if_transmit = start_fn; 4551 } 4552 4553 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4554 { 4555 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4556 4557 } 4558 4559 void 4560 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4561 { 4562 4563 ifp->if_get_counter = fn; 4564 } 4565 4566 /* Revisit these - These are inline functions originally. */ 4567 int 4568 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4569 { 4570 return drbr_inuse(ifh, br); 4571 } 4572 4573 struct mbuf* 4574 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4575 { 4576 return drbr_dequeue(ifh, br); 4577 } 4578 4579 int 4580 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4581 { 4582 return drbr_needs_enqueue(ifh, br); 4583 } 4584 4585 int 4586 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4587 { 4588 return drbr_enqueue(ifh, br, m); 4589 4590 } 4591