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/conf.h> 40 #include <sys/eventhandler.h> 41 #include <sys/malloc.h> 42 #include <sys/domainset.h> 43 #include <sys/sbuf.h> 44 #include <sys/bus.h> 45 #include <sys/epoch.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/priv.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/refcount.h> 56 #include <sys/module.h> 57 #include <sys/rwlock.h> 58 #include <sys/sockio.h> 59 #include <sys/syslog.h> 60 #include <sys/sysctl.h> 61 #include <sys/sysent.h> 62 #include <sys/taskqueue.h> 63 #include <sys/domain.h> 64 #include <sys/jail.h> 65 #include <sys/priv.h> 66 67 #include <machine/stdarg.h> 68 #include <vm/uma.h> 69 70 #include <net/bpf.h> 71 #include <net/ethernet.h> 72 #include <net/if.h> 73 #include <net/if_arp.h> 74 #include <net/if_clone.h> 75 #include <net/if_dl.h> 76 #include <net/if_types.h> 77 #include <net/if_var.h> 78 #include <net/if_media.h> 79 #include <net/if_vlan_var.h> 80 #include <net/radix.h> 81 #include <net/route.h> 82 #include <net/vnet.h> 83 84 #if defined(INET) || defined(INET6) 85 #include <net/ethernet.h> 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet/ip.h> 89 #include <netinet/ip_carp.h> 90 #ifdef INET 91 #include <netinet/if_ether.h> 92 #include <netinet/netdump/netdump.h> 93 #endif /* INET */ 94 #ifdef INET6 95 #include <netinet6/in6_var.h> 96 #include <netinet6/in6_ifattach.h> 97 #endif /* INET6 */ 98 #endif /* INET || INET6 */ 99 100 #include <security/mac/mac_framework.h> 101 102 /* 103 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 104 * and ifr_ifru when it is used in SIOCGIFCONF. 105 */ 106 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 107 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 108 109 __read_mostly epoch_t net_epoch_preempt; 110 __read_mostly epoch_t net_epoch; 111 #ifdef COMPAT_FREEBSD32 112 #include <sys/mount.h> 113 #include <compat/freebsd32/freebsd32.h> 114 115 struct ifreq_buffer32 { 116 uint32_t length; /* (size_t) */ 117 uint32_t buffer; /* (void *) */ 118 }; 119 120 /* 121 * Interface request structure used for socket 122 * ioctl's. All interface ioctl's must have parameter 123 * definitions which begin with ifr_name. The 124 * remainder may be interface specific. 125 */ 126 struct ifreq32 { 127 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 128 union { 129 struct sockaddr ifru_addr; 130 struct sockaddr ifru_dstaddr; 131 struct sockaddr ifru_broadaddr; 132 struct ifreq_buffer32 ifru_buffer; 133 short ifru_flags[2]; 134 short ifru_index; 135 int ifru_jid; 136 int ifru_metric; 137 int ifru_mtu; 138 int ifru_phys; 139 int ifru_media; 140 uint32_t ifru_data; 141 int ifru_cap[2]; 142 u_int ifru_fib; 143 u_char ifru_vlan_pcp; 144 } ifr_ifru; 145 }; 146 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 147 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 148 __offsetof(struct ifreq32, ifr_ifru)); 149 150 struct ifgroupreq32 { 151 char ifgr_name[IFNAMSIZ]; 152 u_int ifgr_len; 153 union { 154 char ifgru_group[IFNAMSIZ]; 155 uint32_t ifgru_groups; 156 } ifgr_ifgru; 157 }; 158 159 struct ifmediareq32 { 160 char ifm_name[IFNAMSIZ]; 161 int ifm_current; 162 int ifm_mask; 163 int ifm_status; 164 int ifm_active; 165 int ifm_count; 166 uint32_t ifm_ulist; /* (int *) */ 167 }; 168 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 169 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 170 171 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 172 _IOC_NEWTYPE((cmd), struct ifgroupreq32): case 173 #else /* !COMPAT_FREEBSD32 */ 174 #define _CASE_IOC_IFGROUPREQ_32(cmd) 175 #endif /* !COMPAT_FREEBSD32 */ 176 177 #define CASE_IOC_IFGROUPREQ(cmd) \ 178 _CASE_IOC_IFGROUPREQ_32(cmd) \ 179 (cmd) 180 181 union ifreq_union { 182 struct ifreq ifr; 183 #ifdef COMPAT_FREEBSD32 184 struct ifreq32 ifr32; 185 #endif 186 }; 187 188 union ifgroupreq_union { 189 struct ifgroupreq ifgr; 190 #ifdef COMPAT_FREEBSD32 191 struct ifgroupreq32 ifgr32; 192 #endif 193 }; 194 195 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 196 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 197 198 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 199 &ifqmaxlen, 0, "max send queue size"); 200 201 /* Log link state change events */ 202 static int log_link_state_change = 1; 203 204 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 205 &log_link_state_change, 0, 206 "log interface link state change events"); 207 208 /* Log promiscuous mode change events */ 209 static int log_promisc_mode_change = 1; 210 211 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 212 &log_promisc_mode_change, 1, 213 "log promiscuous mode change events"); 214 215 /* Interface description */ 216 static unsigned int ifdescr_maxlen = 1024; 217 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 218 &ifdescr_maxlen, 0, 219 "administrative maximum length for interface description"); 220 221 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 222 223 /* global sx for non-critical path ifdescr */ 224 static struct sx ifdescr_sx; 225 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 226 227 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 228 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 229 /* These are external hooks for CARP. */ 230 void (*carp_linkstate_p)(struct ifnet *ifp); 231 void (*carp_demote_adj_p)(int, char *); 232 int (*carp_master_p)(struct ifaddr *); 233 #if defined(INET) || defined(INET6) 234 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 235 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 236 const struct sockaddr *sa); 237 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 238 int (*carp_attach_p)(struct ifaddr *, int); 239 void (*carp_detach_p)(struct ifaddr *, bool); 240 #endif 241 #ifdef INET 242 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 243 #endif 244 #ifdef INET6 245 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 246 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 247 const struct in6_addr *taddr); 248 #endif 249 250 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 251 252 /* 253 * XXX: Style; these should be sorted alphabetically, and unprototyped 254 * static functions should be prototyped. Currently they are sorted by 255 * declaration order. 256 */ 257 static void if_attachdomain(void *); 258 static void if_attachdomain1(struct ifnet *); 259 static int ifconf(u_long, caddr_t); 260 static void *if_grow(void); 261 static void if_input_default(struct ifnet *, struct mbuf *); 262 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 263 static void if_route(struct ifnet *, int flag, int fam); 264 static int if_setflag(struct ifnet *, int, int, int *, int); 265 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 266 static void if_unroute(struct ifnet *, int flag, int fam); 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 epoch_tracker et; 355 struct ifnet *ifp; 356 357 NET_EPOCH_ENTER(et); 358 ifp = ifnet_byindex_locked(idx); 359 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 360 NET_EPOCH_EXIT(et); 361 return (NULL); 362 } 363 if_ref(ifp); 364 NET_EPOCH_EXIT(et); 365 return (ifp); 366 } 367 368 /* 369 * Allocate an ifindex array entry; return 0 on success or an error on 370 * failure. 371 */ 372 static u_short 373 ifindex_alloc(void **old) 374 { 375 u_short idx; 376 377 IFNET_WLOCK_ASSERT(); 378 /* 379 * Try to find an empty slot below V_if_index. If we fail, take the 380 * next slot. 381 */ 382 for (idx = 1; idx <= V_if_index; idx++) { 383 if (V_ifindex_table[idx] == NULL) 384 break; 385 } 386 387 /* Catch if_index overflow. */ 388 if (idx >= V_if_indexlim) { 389 *old = if_grow(); 390 return (USHRT_MAX); 391 } 392 if (idx > V_if_index) 393 V_if_index = idx; 394 return (idx); 395 } 396 397 static void 398 ifindex_free_locked(u_short idx) 399 { 400 401 IFNET_WLOCK_ASSERT(); 402 403 V_ifindex_table[idx] = NULL; 404 while (V_if_index > 0 && 405 V_ifindex_table[V_if_index] == NULL) 406 V_if_index--; 407 } 408 409 static void 410 ifindex_free(u_short idx) 411 { 412 413 IFNET_WLOCK(); 414 ifindex_free_locked(idx); 415 IFNET_WUNLOCK(); 416 } 417 418 static void 419 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 420 { 421 422 V_ifindex_table[idx] = ifp; 423 } 424 425 struct ifaddr * 426 ifaddr_byindex(u_short idx) 427 { 428 struct epoch_tracker et; 429 struct ifnet *ifp; 430 struct ifaddr *ifa = NULL; 431 432 NET_EPOCH_ENTER(et); 433 ifp = ifnet_byindex_locked(idx); 434 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 435 ifa_ref(ifa); 436 NET_EPOCH_EXIT(et); 437 return (ifa); 438 } 439 440 /* 441 * Network interface utility routines. 442 * 443 * Routines with ifa_ifwith* names take sockaddr *'s as 444 * parameters. 445 */ 446 447 static void 448 vnet_if_init(const void *unused __unused) 449 { 450 void *old; 451 452 CK_STAILQ_INIT(&V_ifnet); 453 CK_STAILQ_INIT(&V_ifg_head); 454 IFNET_WLOCK(); 455 old = if_grow(); /* create initial table */ 456 IFNET_WUNLOCK(); 457 epoch_wait_preempt(net_epoch_preempt); 458 free(old, M_IFNET); 459 vnet_if_clone_init(); 460 } 461 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 462 NULL); 463 464 #ifdef VIMAGE 465 static void 466 vnet_if_uninit(const void *unused __unused) 467 { 468 469 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 470 "not empty", __func__, __LINE__, &V_ifnet)); 471 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 472 "not empty", __func__, __LINE__, &V_ifg_head)); 473 474 free((caddr_t)V_ifindex_table, M_IFNET); 475 } 476 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 477 vnet_if_uninit, NULL); 478 479 static void 480 vnet_if_return(const void *unused __unused) 481 { 482 struct ifnet *ifp, *nifp; 483 484 /* Return all inherited interfaces to their parent vnets. */ 485 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 486 if (ifp->if_home_vnet != ifp->if_vnet) 487 if_vmove(ifp, ifp->if_home_vnet); 488 } 489 } 490 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 491 vnet_if_return, NULL); 492 #endif 493 494 495 static void * 496 if_grow(void) 497 { 498 int oldlim; 499 u_int n; 500 struct ifnet **e; 501 void *old; 502 503 old = NULL; 504 IFNET_WLOCK_ASSERT(); 505 oldlim = V_if_indexlim; 506 IFNET_WUNLOCK(); 507 n = (oldlim << 1) * sizeof(*e); 508 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 509 IFNET_WLOCK(); 510 if (V_if_indexlim != oldlim) { 511 free(e, M_IFNET); 512 return (NULL); 513 } 514 if (V_ifindex_table != NULL) { 515 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 516 old = V_ifindex_table; 517 } 518 V_if_indexlim <<= 1; 519 V_ifindex_table = e; 520 return (old); 521 } 522 523 /* 524 * Allocate a struct ifnet and an index for an interface. A layer 2 525 * common structure will also be allocated if an allocation routine is 526 * registered for the passed type. 527 */ 528 struct ifnet * 529 if_alloc_domain(u_char type, int numa_domain) 530 { 531 struct ifnet *ifp; 532 u_short idx; 533 void *old; 534 535 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 536 if (numa_domain == IF_NODOM) 537 ifp = malloc(sizeof(struct ifnet), M_IFNET, 538 M_WAITOK | M_ZERO); 539 else 540 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 541 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 542 restart: 543 IFNET_WLOCK(); 544 idx = ifindex_alloc(&old); 545 if (__predict_false(idx == USHRT_MAX)) { 546 IFNET_WUNLOCK(); 547 epoch_wait_preempt(net_epoch_preempt); 548 free(old, M_IFNET); 549 goto restart; 550 } 551 ifnet_setbyindex(idx, IFNET_HOLD); 552 IFNET_WUNLOCK(); 553 ifp->if_index = idx; 554 ifp->if_type = type; 555 ifp->if_alloctype = type; 556 ifp->if_numa_domain = numa_domain; 557 #ifdef VIMAGE 558 ifp->if_vnet = curvnet; 559 #endif 560 if (if_com_alloc[type] != NULL) { 561 ifp->if_l2com = if_com_alloc[type](type, ifp); 562 if (ifp->if_l2com == NULL) { 563 free(ifp, M_IFNET); 564 ifindex_free(idx); 565 return (NULL); 566 } 567 } 568 569 IF_ADDR_LOCK_INIT(ifp); 570 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 571 ifp->if_afdata_initialized = 0; 572 IF_AFDATA_LOCK_INIT(ifp); 573 CK_STAILQ_INIT(&ifp->if_addrhead); 574 CK_STAILQ_INIT(&ifp->if_multiaddrs); 575 CK_STAILQ_INIT(&ifp->if_groups); 576 #ifdef MAC 577 mac_ifnet_init(ifp); 578 #endif 579 ifq_init(&ifp->if_snd, ifp); 580 581 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 582 for (int i = 0; i < IFCOUNTERS; i++) 583 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 584 ifp->if_get_counter = if_get_counter_default; 585 ifp->if_pcp = IFNET_PCP_NONE; 586 ifnet_setbyindex(ifp->if_index, ifp); 587 return (ifp); 588 } 589 590 struct ifnet * 591 if_alloc_dev(u_char type, device_t dev) 592 { 593 int numa_domain; 594 595 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 596 return (if_alloc_domain(type, IF_NODOM)); 597 return (if_alloc_domain(type, numa_domain)); 598 } 599 600 struct ifnet * 601 if_alloc(u_char type) 602 { 603 604 return (if_alloc_domain(type, IF_NODOM)); 605 } 606 /* 607 * Do the actual work of freeing a struct ifnet, and layer 2 common 608 * structure. This call is made when the last reference to an 609 * interface is released. 610 */ 611 static void 612 if_free_internal(struct ifnet *ifp) 613 { 614 615 KASSERT((ifp->if_flags & IFF_DYING), 616 ("if_free_internal: interface not dying")); 617 618 if (if_com_free[ifp->if_alloctype] != NULL) 619 if_com_free[ifp->if_alloctype](ifp->if_l2com, 620 ifp->if_alloctype); 621 622 #ifdef MAC 623 mac_ifnet_destroy(ifp); 624 #endif /* MAC */ 625 IF_AFDATA_DESTROY(ifp); 626 IF_ADDR_LOCK_DESTROY(ifp); 627 ifq_delete(&ifp->if_snd); 628 629 for (int i = 0; i < IFCOUNTERS; i++) 630 counter_u64_free(ifp->if_counters[i]); 631 632 free(ifp->if_description, M_IFDESCR); 633 free(ifp->if_hw_addr, M_IFADDR); 634 if (ifp->if_numa_domain == IF_NODOM) 635 free(ifp, M_IFNET); 636 else 637 free_domain(ifp, M_IFNET); 638 } 639 640 static void 641 if_destroy(epoch_context_t ctx) 642 { 643 struct ifnet *ifp; 644 645 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 646 if_free_internal(ifp); 647 } 648 649 /* 650 * Deregister an interface and free the associated storage. 651 */ 652 void 653 if_free(struct ifnet *ifp) 654 { 655 656 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 657 658 CURVNET_SET_QUIET(ifp->if_vnet); 659 IFNET_WLOCK(); 660 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 661 ("%s: freeing unallocated ifnet", ifp->if_xname)); 662 663 ifindex_free_locked(ifp->if_index); 664 IFNET_WUNLOCK(); 665 666 if (refcount_release(&ifp->if_refcount)) 667 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 668 CURVNET_RESTORE(); 669 } 670 671 /* 672 * Interfaces to keep an ifnet type-stable despite the possibility of the 673 * driver calling if_free(). If there are additional references, we defer 674 * freeing the underlying data structure. 675 */ 676 void 677 if_ref(struct ifnet *ifp) 678 { 679 680 /* We don't assert the ifnet list lock here, but arguably should. */ 681 refcount_acquire(&ifp->if_refcount); 682 } 683 684 void 685 if_rele(struct ifnet *ifp) 686 { 687 688 if (!refcount_release(&ifp->if_refcount)) 689 return; 690 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 691 } 692 693 void 694 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 695 { 696 697 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 698 699 if (ifq->ifq_maxlen == 0) 700 ifq->ifq_maxlen = ifqmaxlen; 701 702 ifq->altq_type = 0; 703 ifq->altq_disc = NULL; 704 ifq->altq_flags &= ALTQF_CANTCHANGE; 705 ifq->altq_tbr = NULL; 706 ifq->altq_ifp = ifp; 707 } 708 709 void 710 ifq_delete(struct ifaltq *ifq) 711 { 712 mtx_destroy(&ifq->ifq_mtx); 713 } 714 715 /* 716 * Perform generic interface initialization tasks and attach the interface 717 * to the list of "active" interfaces. If vmove flag is set on entry 718 * to if_attach_internal(), perform only a limited subset of initialization 719 * tasks, given that we are moving from one vnet to another an ifnet which 720 * has already been fully initialized. 721 * 722 * Note that if_detach_internal() removes group membership unconditionally 723 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 724 * Thus, when if_vmove() is applied to a cloned interface, group membership 725 * is lost while a cloned one always joins a group whose name is 726 * ifc->ifc_name. To recover this after if_detach_internal() and 727 * if_attach_internal(), the cloner should be specified to 728 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 729 * attempts to join a group whose name is ifc->ifc_name. 730 * 731 * XXX: 732 * - The decision to return void and thus require this function to 733 * succeed is questionable. 734 * - We should probably do more sanity checking. For instance we don't 735 * do anything to insure if_xname is unique or non-empty. 736 */ 737 void 738 if_attach(struct ifnet *ifp) 739 { 740 741 if_attach_internal(ifp, 0, NULL); 742 } 743 744 /* 745 * Compute the least common TSO limit. 746 */ 747 void 748 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 749 { 750 /* 751 * 1) If there is no limit currently, take the limit from 752 * the network adapter. 753 * 754 * 2) If the network adapter has a limit below the current 755 * limit, apply it. 756 */ 757 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 758 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 759 pmax->tsomaxbytes = ifp->if_hw_tsomax; 760 } 761 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 762 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 763 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 764 } 765 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 766 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 767 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 768 } 769 } 770 771 /* 772 * Update TSO limit of a network adapter. 773 * 774 * Returns zero if no change. Else non-zero. 775 */ 776 int 777 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 778 { 779 int retval = 0; 780 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 781 ifp->if_hw_tsomax = pmax->tsomaxbytes; 782 retval++; 783 } 784 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 785 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 786 retval++; 787 } 788 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 789 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 790 retval++; 791 } 792 return (retval); 793 } 794 795 static void 796 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 797 { 798 unsigned socksize, ifasize; 799 int namelen, masklen; 800 struct sockaddr_dl *sdl; 801 struct ifaddr *ifa; 802 803 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 804 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 805 ifp->if_xname); 806 807 #ifdef VIMAGE 808 ifp->if_vnet = curvnet; 809 if (ifp->if_home_vnet == NULL) 810 ifp->if_home_vnet = curvnet; 811 #endif 812 813 if_addgroup(ifp, IFG_ALL); 814 815 /* Restore group membership for cloned interfaces. */ 816 if (vmove && ifc != NULL) 817 if_clone_addgroup(ifp, ifc); 818 819 getmicrotime(&ifp->if_lastchange); 820 ifp->if_epoch = time_uptime; 821 822 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 823 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 824 ("transmit and qflush must both either be set or both be NULL")); 825 if (ifp->if_transmit == NULL) { 826 ifp->if_transmit = if_transmit; 827 ifp->if_qflush = if_qflush; 828 } 829 if (ifp->if_input == NULL) 830 ifp->if_input = if_input_default; 831 832 if (ifp->if_requestencap == NULL) 833 ifp->if_requestencap = if_requestencap_default; 834 835 if (!vmove) { 836 #ifdef MAC 837 mac_ifnet_create(ifp); 838 #endif 839 840 /* 841 * Create a Link Level name for this device. 842 */ 843 namelen = strlen(ifp->if_xname); 844 /* 845 * Always save enough space for any possiable name so we 846 * can do a rename in place later. 847 */ 848 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 849 socksize = masklen + ifp->if_addrlen; 850 if (socksize < sizeof(*sdl)) 851 socksize = sizeof(*sdl); 852 socksize = roundup2(socksize, sizeof(long)); 853 ifasize = sizeof(*ifa) + 2 * socksize; 854 ifa = ifa_alloc(ifasize, M_WAITOK); 855 sdl = (struct sockaddr_dl *)(ifa + 1); 856 sdl->sdl_len = socksize; 857 sdl->sdl_family = AF_LINK; 858 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 859 sdl->sdl_nlen = namelen; 860 sdl->sdl_index = ifp->if_index; 861 sdl->sdl_type = ifp->if_type; 862 ifp->if_addr = ifa; 863 ifa->ifa_ifp = ifp; 864 ifa->ifa_addr = (struct sockaddr *)sdl; 865 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 866 ifa->ifa_netmask = (struct sockaddr *)sdl; 867 sdl->sdl_len = masklen; 868 while (namelen != 0) 869 sdl->sdl_data[--namelen] = 0xff; 870 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 871 /* Reliably crash if used uninitialized. */ 872 ifp->if_broadcastaddr = NULL; 873 874 if (ifp->if_type == IFT_ETHER) { 875 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 876 M_WAITOK | M_ZERO); 877 } 878 879 #if defined(INET) || defined(INET6) 880 /* Use defaults for TSO, if nothing is set */ 881 if (ifp->if_hw_tsomax == 0 && 882 ifp->if_hw_tsomaxsegcount == 0 && 883 ifp->if_hw_tsomaxsegsize == 0) { 884 /* 885 * The TSO defaults needs to be such that an 886 * NFS mbuf list of 35 mbufs totalling just 887 * below 64K works and that a chain of mbufs 888 * can be defragged into at most 32 segments: 889 */ 890 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 891 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 892 ifp->if_hw_tsomaxsegcount = 35; 893 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 894 895 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 896 if (ifp->if_capabilities & IFCAP_TSO) { 897 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 898 ifp->if_hw_tsomax, 899 ifp->if_hw_tsomaxsegcount, 900 ifp->if_hw_tsomaxsegsize); 901 } 902 } 903 #endif 904 } 905 #ifdef VIMAGE 906 else { 907 /* 908 * Update the interface index in the link layer address 909 * of the interface. 910 */ 911 for (ifa = ifp->if_addr; ifa != NULL; 912 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 913 if (ifa->ifa_addr->sa_family == AF_LINK) { 914 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 915 sdl->sdl_index = ifp->if_index; 916 } 917 } 918 } 919 #endif 920 921 IFNET_WLOCK(); 922 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 923 #ifdef VIMAGE 924 curvnet->vnet_ifcnt++; 925 #endif 926 IFNET_WUNLOCK(); 927 928 if (domain_init_status >= 2) 929 if_attachdomain1(ifp); 930 931 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 932 if (IS_DEFAULT_VNET(curvnet)) 933 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 934 935 /* Announce the interface. */ 936 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 937 } 938 939 static void 940 if_epochalloc(void *dummy __unused) 941 { 942 943 net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT); 944 net_epoch = epoch_alloc(0); 945 } 946 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 947 if_epochalloc, NULL); 948 949 static void 950 if_attachdomain(void *dummy) 951 { 952 struct ifnet *ifp; 953 954 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 955 if_attachdomain1(ifp); 956 } 957 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 958 if_attachdomain, NULL); 959 960 static void 961 if_attachdomain1(struct ifnet *ifp) 962 { 963 struct domain *dp; 964 965 /* 966 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 967 * cannot lock ifp->if_afdata initialization, entirely. 968 */ 969 IF_AFDATA_LOCK(ifp); 970 if (ifp->if_afdata_initialized >= domain_init_status) { 971 IF_AFDATA_UNLOCK(ifp); 972 log(LOG_WARNING, "%s called more than once on %s\n", 973 __func__, ifp->if_xname); 974 return; 975 } 976 ifp->if_afdata_initialized = domain_init_status; 977 IF_AFDATA_UNLOCK(ifp); 978 979 /* address family dependent data region */ 980 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 981 for (dp = domains; dp; dp = dp->dom_next) { 982 if (dp->dom_ifattach) 983 ifp->if_afdata[dp->dom_family] = 984 (*dp->dom_ifattach)(ifp); 985 } 986 } 987 988 /* 989 * Remove any unicast or broadcast network addresses from an interface. 990 */ 991 void 992 if_purgeaddrs(struct ifnet *ifp) 993 { 994 struct ifaddr *ifa; 995 996 while (1) { 997 struct epoch_tracker et; 998 999 NET_EPOCH_ENTER(et); 1000 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1001 if (ifa->ifa_addr->sa_family != AF_LINK) 1002 break; 1003 } 1004 NET_EPOCH_EXIT(et); 1005 1006 if (ifa == NULL) 1007 break; 1008 #ifdef INET 1009 /* XXX: Ugly!! ad hoc just for INET */ 1010 if (ifa->ifa_addr->sa_family == AF_INET) { 1011 struct ifaliasreq ifr; 1012 1013 bzero(&ifr, sizeof(ifr)); 1014 ifr.ifra_addr = *ifa->ifa_addr; 1015 if (ifa->ifa_dstaddr) 1016 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1017 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1018 NULL) == 0) 1019 continue; 1020 } 1021 #endif /* INET */ 1022 #ifdef INET6 1023 if (ifa->ifa_addr->sa_family == AF_INET6) { 1024 in6_purgeaddr(ifa); 1025 /* ifp_addrhead is already updated */ 1026 continue; 1027 } 1028 #endif /* INET6 */ 1029 IF_ADDR_WLOCK(ifp); 1030 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1031 IF_ADDR_WUNLOCK(ifp); 1032 ifa_free(ifa); 1033 } 1034 } 1035 1036 /* 1037 * Remove any multicast network addresses from an interface when an ifnet 1038 * is going away. 1039 */ 1040 static void 1041 if_purgemaddrs(struct ifnet *ifp) 1042 { 1043 struct ifmultiaddr *ifma; 1044 1045 IF_ADDR_WLOCK(ifp); 1046 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1047 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1048 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1049 if_delmulti_locked(ifp, ifma, 1); 1050 } 1051 IF_ADDR_WUNLOCK(ifp); 1052 } 1053 1054 /* 1055 * Detach an interface, removing it from the list of "active" interfaces. 1056 * If vmove flag is set on entry to if_detach_internal(), perform only a 1057 * limited subset of cleanup tasks, given that we are moving an ifnet from 1058 * one vnet to another, where it must be fully operational. 1059 * 1060 * XXXRW: There are some significant questions about event ordering, and 1061 * how to prevent things from starting to use the interface during detach. 1062 */ 1063 void 1064 if_detach(struct ifnet *ifp) 1065 { 1066 1067 CURVNET_SET_QUIET(ifp->if_vnet); 1068 if_detach_internal(ifp, 0, NULL); 1069 CURVNET_RESTORE(); 1070 } 1071 1072 /* 1073 * The vmove flag, if set, indicates that we are called from a callpath 1074 * that is moving an interface to a different vnet instance. 1075 * 1076 * The shutdown flag, if set, indicates that we are called in the 1077 * process of shutting down a vnet instance. Currently only the 1078 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1079 * on a vnet instance shutdown without this flag being set, e.g., when 1080 * the cloned interfaces are destoyed as first thing of teardown. 1081 */ 1082 static int 1083 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1084 { 1085 struct ifaddr *ifa; 1086 int i; 1087 struct domain *dp; 1088 struct ifnet *iter; 1089 int found = 0; 1090 #ifdef VIMAGE 1091 int shutdown; 1092 1093 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1094 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1095 #endif 1096 IFNET_WLOCK(); 1097 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1098 if (iter == ifp) { 1099 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1100 if (!vmove) 1101 ifp->if_flags |= IFF_DYING; 1102 found = 1; 1103 break; 1104 } 1105 IFNET_WUNLOCK(); 1106 if (!found) { 1107 /* 1108 * While we would want to panic here, we cannot 1109 * guarantee that the interface is indeed still on 1110 * the list given we don't hold locks all the way. 1111 */ 1112 return (ENOENT); 1113 #if 0 1114 if (vmove) 1115 panic("%s: ifp=%p not on the ifnet tailq %p", 1116 __func__, ifp, &V_ifnet); 1117 else 1118 return; /* XXX this should panic as well? */ 1119 #endif 1120 } 1121 1122 /* 1123 * At this point we know the interface still was on the ifnet list 1124 * and we removed it so we are in a stable state. 1125 */ 1126 #ifdef VIMAGE 1127 curvnet->vnet_ifcnt--; 1128 #endif 1129 epoch_wait_preempt(net_epoch_preempt); 1130 1131 /* 1132 * Ensure all pending EPOCH(9) callbacks have been executed. This 1133 * fixes issues about late destruction of multicast options 1134 * which lead to leave group calls, which in turn access the 1135 * belonging ifnet structure: 1136 */ 1137 epoch_drain_callbacks(net_epoch_preempt); 1138 1139 /* 1140 * In any case (destroy or vmove) detach us from the groups 1141 * and remove/wait for pending events on the taskq. 1142 * XXX-BZ in theory an interface could still enqueue a taskq change? 1143 */ 1144 if_delgroups(ifp); 1145 1146 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1147 1148 /* 1149 * Check if this is a cloned interface or not. Must do even if 1150 * shutting down as a if_vmove_reclaim() would move the ifp and 1151 * the if_clone_addgroup() will have a corrupted string overwise 1152 * from a gibberish pointer. 1153 */ 1154 if (vmove && ifcp != NULL) 1155 *ifcp = if_clone_findifc(ifp); 1156 1157 if_down(ifp); 1158 1159 #ifdef VIMAGE 1160 /* 1161 * On VNET shutdown abort here as the stack teardown will do all 1162 * the work top-down for us. 1163 */ 1164 if (shutdown) { 1165 /* Give interface users the chance to clean up. */ 1166 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1167 1168 /* 1169 * In case of a vmove we are done here without error. 1170 * If we would signal an error it would lead to the same 1171 * abort as if we did not find the ifnet anymore. 1172 * if_detach() calls us in void context and does not care 1173 * about an early abort notification, so life is splendid :) 1174 */ 1175 goto finish_vnet_shutdown; 1176 } 1177 #endif 1178 1179 /* 1180 * At this point we are not tearing down a VNET and are either 1181 * going to destroy or vmove the interface and have to cleanup 1182 * accordingly. 1183 */ 1184 1185 /* 1186 * Remove routes and flush queues. 1187 */ 1188 #ifdef ALTQ 1189 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1190 altq_disable(&ifp->if_snd); 1191 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1192 altq_detach(&ifp->if_snd); 1193 #endif 1194 1195 if_purgeaddrs(ifp); 1196 1197 #ifdef INET 1198 in_ifdetach(ifp); 1199 #endif 1200 1201 #ifdef INET6 1202 /* 1203 * Remove all IPv6 kernel structs related to ifp. This should be done 1204 * before removing routing entries below, since IPv6 interface direct 1205 * routes are expected to be removed by the IPv6-specific kernel API. 1206 * Otherwise, the kernel will detect some inconsistency and bark it. 1207 */ 1208 in6_ifdetach(ifp); 1209 #endif 1210 if_purgemaddrs(ifp); 1211 1212 /* Announce that the interface is gone. */ 1213 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1214 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1215 if (IS_DEFAULT_VNET(curvnet)) 1216 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1217 1218 if (!vmove) { 1219 /* 1220 * Prevent further calls into the device driver via ifnet. 1221 */ 1222 if_dead(ifp); 1223 1224 /* 1225 * Clean up all addresses. 1226 */ 1227 IF_ADDR_WLOCK(ifp); 1228 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1229 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1230 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1231 IF_ADDR_WUNLOCK(ifp); 1232 ifa_free(ifa); 1233 } else 1234 IF_ADDR_WUNLOCK(ifp); 1235 } 1236 1237 rt_flushifroutes(ifp); 1238 1239 #ifdef VIMAGE 1240 finish_vnet_shutdown: 1241 #endif 1242 /* 1243 * We cannot hold the lock over dom_ifdetach calls as they might 1244 * sleep, for example trying to drain a callout, thus open up the 1245 * theoretical race with re-attaching. 1246 */ 1247 IF_AFDATA_LOCK(ifp); 1248 i = ifp->if_afdata_initialized; 1249 ifp->if_afdata_initialized = 0; 1250 IF_AFDATA_UNLOCK(ifp); 1251 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1252 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1253 (*dp->dom_ifdetach)(ifp, 1254 ifp->if_afdata[dp->dom_family]); 1255 ifp->if_afdata[dp->dom_family] = NULL; 1256 } 1257 } 1258 1259 return (0); 1260 } 1261 1262 #ifdef VIMAGE 1263 /* 1264 * if_vmove() performs a limited version of if_detach() in current 1265 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1266 * An attempt is made to shrink if_index in current vnet, find an 1267 * unused if_index in target vnet and calls if_grow() if necessary, 1268 * and finally find an unused if_xname for the target vnet. 1269 */ 1270 static void 1271 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1272 { 1273 struct if_clone *ifc; 1274 u_int bif_dlt, bif_hdrlen; 1275 void *old; 1276 int rc; 1277 1278 /* 1279 * if_detach_internal() will call the eventhandler to notify 1280 * interface departure. That will detach if_bpf. We need to 1281 * safe the dlt and hdrlen so we can re-attach it later. 1282 */ 1283 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1284 1285 /* 1286 * Detach from current vnet, but preserve LLADDR info, do not 1287 * mark as dead etc. so that the ifnet can be reattached later. 1288 * If we cannot find it, we lost the race to someone else. 1289 */ 1290 rc = if_detach_internal(ifp, 1, &ifc); 1291 if (rc != 0) 1292 return; 1293 1294 /* 1295 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1296 * the if_index for that vnet if possible. 1297 * 1298 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1299 * or we'd lock on one vnet and unlock on another. 1300 */ 1301 IFNET_WLOCK(); 1302 ifindex_free_locked(ifp->if_index); 1303 IFNET_WUNLOCK(); 1304 1305 /* 1306 * Perform interface-specific reassignment tasks, if provided by 1307 * the driver. 1308 */ 1309 if (ifp->if_reassign != NULL) 1310 ifp->if_reassign(ifp, new_vnet, NULL); 1311 1312 /* 1313 * Switch to the context of the target vnet. 1314 */ 1315 CURVNET_SET_QUIET(new_vnet); 1316 restart: 1317 IFNET_WLOCK(); 1318 ifp->if_index = ifindex_alloc(&old); 1319 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1320 IFNET_WUNLOCK(); 1321 epoch_wait_preempt(net_epoch_preempt); 1322 free(old, M_IFNET); 1323 goto restart; 1324 } 1325 ifnet_setbyindex(ifp->if_index, ifp); 1326 IFNET_WUNLOCK(); 1327 1328 if_attach_internal(ifp, 1, ifc); 1329 1330 if (ifp->if_bpf == NULL) 1331 bpfattach(ifp, bif_dlt, bif_hdrlen); 1332 1333 CURVNET_RESTORE(); 1334 } 1335 1336 /* 1337 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1338 */ 1339 static int 1340 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1341 { 1342 struct prison *pr; 1343 struct ifnet *difp; 1344 int shutdown; 1345 1346 /* Try to find the prison within our visibility. */ 1347 sx_slock(&allprison_lock); 1348 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1349 sx_sunlock(&allprison_lock); 1350 if (pr == NULL) 1351 return (ENXIO); 1352 prison_hold_locked(pr); 1353 mtx_unlock(&pr->pr_mtx); 1354 1355 /* Do not try to move the iface from and to the same prison. */ 1356 if (pr->pr_vnet == ifp->if_vnet) { 1357 prison_free(pr); 1358 return (EEXIST); 1359 } 1360 1361 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1362 /* XXX Lock interfaces to avoid races. */ 1363 CURVNET_SET_QUIET(pr->pr_vnet); 1364 difp = ifunit(ifname); 1365 if (difp != NULL) { 1366 CURVNET_RESTORE(); 1367 prison_free(pr); 1368 return (EEXIST); 1369 } 1370 1371 /* Make sure the VNET is stable. */ 1372 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1373 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1374 if (shutdown) { 1375 CURVNET_RESTORE(); 1376 prison_free(pr); 1377 return (EBUSY); 1378 } 1379 CURVNET_RESTORE(); 1380 1381 /* Move the interface into the child jail/vnet. */ 1382 if_vmove(ifp, pr->pr_vnet); 1383 1384 /* Report the new if_xname back to the userland. */ 1385 sprintf(ifname, "%s", ifp->if_xname); 1386 1387 prison_free(pr); 1388 return (0); 1389 } 1390 1391 static int 1392 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1393 { 1394 struct prison *pr; 1395 struct vnet *vnet_dst; 1396 struct ifnet *ifp; 1397 int shutdown; 1398 1399 /* Try to find the prison within our visibility. */ 1400 sx_slock(&allprison_lock); 1401 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1402 sx_sunlock(&allprison_lock); 1403 if (pr == NULL) 1404 return (ENXIO); 1405 prison_hold_locked(pr); 1406 mtx_unlock(&pr->pr_mtx); 1407 1408 /* Make sure the named iface exists in the source prison/vnet. */ 1409 CURVNET_SET(pr->pr_vnet); 1410 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1411 if (ifp == NULL) { 1412 CURVNET_RESTORE(); 1413 prison_free(pr); 1414 return (ENXIO); 1415 } 1416 1417 /* Do not try to move the iface from and to the same prison. */ 1418 vnet_dst = TD_TO_VNET(td); 1419 if (vnet_dst == ifp->if_vnet) { 1420 CURVNET_RESTORE(); 1421 prison_free(pr); 1422 return (EEXIST); 1423 } 1424 1425 /* Make sure the VNET is stable. */ 1426 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1427 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1428 if (shutdown) { 1429 CURVNET_RESTORE(); 1430 prison_free(pr); 1431 return (EBUSY); 1432 } 1433 1434 /* Get interface back from child jail/vnet. */ 1435 if_vmove(ifp, vnet_dst); 1436 CURVNET_RESTORE(); 1437 1438 /* Report the new if_xname back to the userland. */ 1439 sprintf(ifname, "%s", ifp->if_xname); 1440 1441 prison_free(pr); 1442 return (0); 1443 } 1444 #endif /* VIMAGE */ 1445 1446 /* 1447 * Add a group to an interface 1448 */ 1449 int 1450 if_addgroup(struct ifnet *ifp, const char *groupname) 1451 { 1452 struct ifg_list *ifgl; 1453 struct ifg_group *ifg = NULL; 1454 struct ifg_member *ifgm; 1455 int new = 0; 1456 1457 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1458 groupname[strlen(groupname) - 1] <= '9') 1459 return (EINVAL); 1460 1461 IFNET_WLOCK(); 1462 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1463 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1464 IFNET_WUNLOCK(); 1465 return (EEXIST); 1466 } 1467 1468 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1469 M_NOWAIT)) == NULL) { 1470 IFNET_WUNLOCK(); 1471 return (ENOMEM); 1472 } 1473 1474 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1475 M_TEMP, M_NOWAIT)) == NULL) { 1476 free(ifgl, M_TEMP); 1477 IFNET_WUNLOCK(); 1478 return (ENOMEM); 1479 } 1480 1481 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1482 if (!strcmp(ifg->ifg_group, groupname)) 1483 break; 1484 1485 if (ifg == NULL) { 1486 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1487 M_TEMP, M_NOWAIT)) == NULL) { 1488 free(ifgl, M_TEMP); 1489 free(ifgm, M_TEMP); 1490 IFNET_WUNLOCK(); 1491 return (ENOMEM); 1492 } 1493 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1494 ifg->ifg_refcnt = 0; 1495 CK_STAILQ_INIT(&ifg->ifg_members); 1496 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1497 new = 1; 1498 } 1499 1500 ifg->ifg_refcnt++; 1501 ifgl->ifgl_group = ifg; 1502 ifgm->ifgm_ifp = ifp; 1503 1504 IF_ADDR_WLOCK(ifp); 1505 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1506 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1507 IF_ADDR_WUNLOCK(ifp); 1508 1509 IFNET_WUNLOCK(); 1510 1511 if (new) 1512 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1513 EVENTHANDLER_INVOKE(group_change_event, groupname); 1514 1515 return (0); 1516 } 1517 1518 /* 1519 * Remove a group from an interface 1520 */ 1521 int 1522 if_delgroup(struct ifnet *ifp, const char *groupname) 1523 { 1524 struct ifg_list *ifgl; 1525 struct ifg_member *ifgm; 1526 int freeifgl; 1527 1528 IFNET_WLOCK(); 1529 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1530 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1531 break; 1532 if (ifgl == NULL) { 1533 IFNET_WUNLOCK(); 1534 return (ENOENT); 1535 } 1536 1537 freeifgl = 0; 1538 IF_ADDR_WLOCK(ifp); 1539 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1540 IF_ADDR_WUNLOCK(ifp); 1541 1542 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1543 if (ifgm->ifgm_ifp == ifp) 1544 break; 1545 1546 if (ifgm != NULL) 1547 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1548 1549 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1550 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1551 freeifgl = 1; 1552 } 1553 IFNET_WUNLOCK(); 1554 1555 epoch_wait_preempt(net_epoch_preempt); 1556 if (freeifgl) { 1557 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1558 free(ifgl->ifgl_group, M_TEMP); 1559 } 1560 free(ifgm, M_TEMP); 1561 free(ifgl, M_TEMP); 1562 1563 EVENTHANDLER_INVOKE(group_change_event, groupname); 1564 1565 return (0); 1566 } 1567 1568 /* 1569 * Remove an interface from all groups 1570 */ 1571 static void 1572 if_delgroups(struct ifnet *ifp) 1573 { 1574 struct ifg_list *ifgl; 1575 struct ifg_member *ifgm; 1576 char groupname[IFNAMSIZ]; 1577 int ifglfree; 1578 1579 IFNET_WLOCK(); 1580 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1581 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1582 1583 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1584 1585 IF_ADDR_WLOCK(ifp); 1586 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1587 IF_ADDR_WUNLOCK(ifp); 1588 1589 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1590 if (ifgm->ifgm_ifp == ifp) 1591 break; 1592 1593 if (ifgm != NULL) 1594 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1595 ifgm_next); 1596 ifglfree = 0; 1597 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1598 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1599 ifglfree = 1; 1600 } 1601 1602 IFNET_WUNLOCK(); 1603 epoch_wait_preempt(net_epoch_preempt); 1604 free(ifgm, M_TEMP); 1605 if (ifglfree) { 1606 EVENTHANDLER_INVOKE(group_detach_event, 1607 ifgl->ifgl_group); 1608 free(ifgl->ifgl_group, M_TEMP); 1609 } 1610 EVENTHANDLER_INVOKE(group_change_event, groupname); 1611 1612 IFNET_WLOCK(); 1613 } 1614 IFNET_WUNLOCK(); 1615 } 1616 1617 static char * 1618 ifgr_group_get(void *ifgrp) 1619 { 1620 union ifgroupreq_union *ifgrup; 1621 1622 ifgrup = ifgrp; 1623 #ifdef COMPAT_FREEBSD32 1624 if (SV_CURPROC_FLAG(SV_ILP32)) 1625 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1626 #endif 1627 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1628 } 1629 1630 static struct ifg_req * 1631 ifgr_groups_get(void *ifgrp) 1632 { 1633 union ifgroupreq_union *ifgrup; 1634 1635 ifgrup = ifgrp; 1636 #ifdef COMPAT_FREEBSD32 1637 if (SV_CURPROC_FLAG(SV_ILP32)) 1638 return ((struct ifg_req *)(uintptr_t) 1639 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1640 #endif 1641 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1642 } 1643 1644 /* 1645 * Stores all groups from an interface in memory pointed to by ifgr. 1646 */ 1647 static int 1648 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1649 { 1650 struct epoch_tracker et; 1651 int len, error; 1652 struct ifg_list *ifgl; 1653 struct ifg_req ifgrq, *ifgp; 1654 1655 if (ifgr->ifgr_len == 0) { 1656 NET_EPOCH_ENTER(et); 1657 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1658 ifgr->ifgr_len += sizeof(struct ifg_req); 1659 NET_EPOCH_EXIT(et); 1660 return (0); 1661 } 1662 1663 len = ifgr->ifgr_len; 1664 ifgp = ifgr_groups_get(ifgr); 1665 /* XXX: wire */ 1666 NET_EPOCH_ENTER(et); 1667 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1668 if (len < sizeof(ifgrq)) { 1669 NET_EPOCH_EXIT(et); 1670 return (EINVAL); 1671 } 1672 bzero(&ifgrq, sizeof ifgrq); 1673 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1674 sizeof(ifgrq.ifgrq_group)); 1675 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1676 NET_EPOCH_EXIT(et); 1677 return (error); 1678 } 1679 len -= sizeof(ifgrq); 1680 ifgp++; 1681 } 1682 NET_EPOCH_EXIT(et); 1683 1684 return (0); 1685 } 1686 1687 /* 1688 * Stores all members of a group in memory pointed to by igfr 1689 */ 1690 static int 1691 if_getgroupmembers(struct ifgroupreq *ifgr) 1692 { 1693 struct ifg_group *ifg; 1694 struct ifg_member *ifgm; 1695 struct ifg_req ifgrq, *ifgp; 1696 int len, error; 1697 1698 IFNET_RLOCK(); 1699 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1700 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1701 break; 1702 if (ifg == NULL) { 1703 IFNET_RUNLOCK(); 1704 return (ENOENT); 1705 } 1706 1707 if (ifgr->ifgr_len == 0) { 1708 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1709 ifgr->ifgr_len += sizeof(ifgrq); 1710 IFNET_RUNLOCK(); 1711 return (0); 1712 } 1713 1714 len = ifgr->ifgr_len; 1715 ifgp = ifgr_groups_get(ifgr); 1716 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1717 if (len < sizeof(ifgrq)) { 1718 IFNET_RUNLOCK(); 1719 return (EINVAL); 1720 } 1721 bzero(&ifgrq, sizeof ifgrq); 1722 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1723 sizeof(ifgrq.ifgrq_member)); 1724 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1725 IFNET_RUNLOCK(); 1726 return (error); 1727 } 1728 len -= sizeof(ifgrq); 1729 ifgp++; 1730 } 1731 IFNET_RUNLOCK(); 1732 1733 return (0); 1734 } 1735 1736 /* 1737 * Return counter values from counter(9)s stored in ifnet. 1738 */ 1739 uint64_t 1740 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1741 { 1742 1743 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1744 1745 return (counter_u64_fetch(ifp->if_counters[cnt])); 1746 } 1747 1748 /* 1749 * Increase an ifnet counter. Usually used for counters shared 1750 * between the stack and a driver, but function supports them all. 1751 */ 1752 void 1753 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1754 { 1755 1756 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1757 1758 counter_u64_add(ifp->if_counters[cnt], inc); 1759 } 1760 1761 /* 1762 * Copy data from ifnet to userland API structure if_data. 1763 */ 1764 void 1765 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1766 { 1767 1768 ifd->ifi_type = ifp->if_type; 1769 ifd->ifi_physical = 0; 1770 ifd->ifi_addrlen = ifp->if_addrlen; 1771 ifd->ifi_hdrlen = ifp->if_hdrlen; 1772 ifd->ifi_link_state = ifp->if_link_state; 1773 ifd->ifi_vhid = 0; 1774 ifd->ifi_datalen = sizeof(struct if_data); 1775 ifd->ifi_mtu = ifp->if_mtu; 1776 ifd->ifi_metric = ifp->if_metric; 1777 ifd->ifi_baudrate = ifp->if_baudrate; 1778 ifd->ifi_hwassist = ifp->if_hwassist; 1779 ifd->ifi_epoch = ifp->if_epoch; 1780 ifd->ifi_lastchange = ifp->if_lastchange; 1781 1782 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1783 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1784 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1785 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1786 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1787 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1788 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1789 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1790 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1791 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1792 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1793 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1794 } 1795 1796 /* 1797 * Wrapper functions for struct ifnet address list locking macros. These are 1798 * used by kernel modules to avoid encoding programming interface or binary 1799 * interface assumptions that may be violated when kernel-internal locking 1800 * approaches change. 1801 */ 1802 void 1803 if_addr_rlock(struct ifnet *ifp) 1804 { 1805 1806 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1807 } 1808 1809 void 1810 if_addr_runlock(struct ifnet *ifp) 1811 { 1812 1813 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1814 } 1815 1816 void 1817 if_maddr_rlock(if_t ifp) 1818 { 1819 1820 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1821 } 1822 1823 void 1824 if_maddr_runlock(if_t ifp) 1825 { 1826 1827 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1828 } 1829 1830 /* 1831 * Initialization, destruction and refcounting functions for ifaddrs. 1832 */ 1833 struct ifaddr * 1834 ifa_alloc(size_t size, int flags) 1835 { 1836 struct ifaddr *ifa; 1837 1838 KASSERT(size >= sizeof(struct ifaddr), 1839 ("%s: invalid size %zu", __func__, size)); 1840 1841 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1842 if (ifa == NULL) 1843 return (NULL); 1844 1845 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1846 goto fail; 1847 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1848 goto fail; 1849 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1850 goto fail; 1851 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1852 goto fail; 1853 1854 refcount_init(&ifa->ifa_refcnt, 1); 1855 1856 return (ifa); 1857 1858 fail: 1859 /* free(NULL) is okay */ 1860 counter_u64_free(ifa->ifa_opackets); 1861 counter_u64_free(ifa->ifa_ipackets); 1862 counter_u64_free(ifa->ifa_obytes); 1863 counter_u64_free(ifa->ifa_ibytes); 1864 free(ifa, M_IFADDR); 1865 1866 return (NULL); 1867 } 1868 1869 void 1870 ifa_ref(struct ifaddr *ifa) 1871 { 1872 1873 refcount_acquire(&ifa->ifa_refcnt); 1874 } 1875 1876 static void 1877 ifa_destroy(epoch_context_t ctx) 1878 { 1879 struct ifaddr *ifa; 1880 1881 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1882 counter_u64_free(ifa->ifa_opackets); 1883 counter_u64_free(ifa->ifa_ipackets); 1884 counter_u64_free(ifa->ifa_obytes); 1885 counter_u64_free(ifa->ifa_ibytes); 1886 free(ifa, M_IFADDR); 1887 } 1888 1889 void 1890 ifa_free(struct ifaddr *ifa) 1891 { 1892 1893 if (refcount_release(&ifa->ifa_refcnt)) 1894 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1895 } 1896 1897 1898 static int 1899 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1900 struct sockaddr *ia) 1901 { 1902 struct epoch_tracker et; 1903 int error; 1904 struct rt_addrinfo info; 1905 struct sockaddr_dl null_sdl; 1906 struct ifnet *ifp; 1907 1908 ifp = ifa->ifa_ifp; 1909 1910 bzero(&info, sizeof(info)); 1911 if (cmd != RTM_DELETE) 1912 info.rti_ifp = V_loif; 1913 if (cmd == RTM_ADD) { 1914 /* explicitly specify (loopback) ifa */ 1915 if (info.rti_ifp != NULL) { 1916 NET_EPOCH_ENTER(et); 1917 info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1918 if (info.rti_ifa != NULL) 1919 ifa_ref(info.rti_ifa); 1920 NET_EPOCH_EXIT(et); 1921 } 1922 } 1923 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1924 info.rti_info[RTAX_DST] = ia; 1925 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1926 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1927 1928 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1929 1930 if (error != 0 && 1931 !(cmd == RTM_ADD && error == EEXIST) && 1932 !(cmd == RTM_DELETE && error == ENOENT)) 1933 if_printf(ifp, "%s failed: %d\n", otype, error); 1934 1935 return (error); 1936 } 1937 1938 int 1939 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1940 { 1941 1942 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1943 } 1944 1945 int 1946 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1947 { 1948 1949 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1950 } 1951 1952 int 1953 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1954 { 1955 1956 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1957 } 1958 1959 /* 1960 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1961 * structs used to represent other address families, it is necessary 1962 * to perform a different comparison. 1963 */ 1964 1965 #define sa_dl_equal(a1, a2) \ 1966 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1967 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1968 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1969 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1970 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1971 1972 /* 1973 * Locate an interface based on a complete address. 1974 */ 1975 /*ARGSUSED*/ 1976 struct ifaddr * 1977 ifa_ifwithaddr(const struct sockaddr *addr) 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 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1985 if (ifa->ifa_addr->sa_family != addr->sa_family) 1986 continue; 1987 if (sa_equal(addr, ifa->ifa_addr)) { 1988 goto done; 1989 } 1990 /* IP6 doesn't have broadcast */ 1991 if ((ifp->if_flags & IFF_BROADCAST) && 1992 ifa->ifa_broadaddr && 1993 ifa->ifa_broadaddr->sa_len != 0 && 1994 sa_equal(ifa->ifa_broadaddr, addr)) { 1995 goto done; 1996 } 1997 } 1998 } 1999 ifa = NULL; 2000 done: 2001 return (ifa); 2002 } 2003 2004 int 2005 ifa_ifwithaddr_check(const struct sockaddr *addr) 2006 { 2007 struct epoch_tracker et; 2008 int rc; 2009 2010 NET_EPOCH_ENTER(et); 2011 rc = (ifa_ifwithaddr(addr) != NULL); 2012 NET_EPOCH_EXIT(et); 2013 return (rc); 2014 } 2015 2016 /* 2017 * Locate an interface based on the broadcast address. 2018 */ 2019 /* ARGSUSED */ 2020 struct ifaddr * 2021 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 2022 { 2023 struct ifnet *ifp; 2024 struct ifaddr *ifa; 2025 2026 MPASS(in_epoch(net_epoch_preempt)); 2027 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2028 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2029 continue; 2030 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2031 if (ifa->ifa_addr->sa_family != addr->sa_family) 2032 continue; 2033 if ((ifp->if_flags & IFF_BROADCAST) && 2034 ifa->ifa_broadaddr && 2035 ifa->ifa_broadaddr->sa_len != 0 && 2036 sa_equal(ifa->ifa_broadaddr, addr)) { 2037 goto done; 2038 } 2039 } 2040 } 2041 ifa = NULL; 2042 done: 2043 return (ifa); 2044 } 2045 2046 /* 2047 * Locate the point to point interface with a given destination address. 2048 */ 2049 /*ARGSUSED*/ 2050 struct ifaddr * 2051 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2052 { 2053 struct ifnet *ifp; 2054 struct ifaddr *ifa; 2055 2056 MPASS(in_epoch(net_epoch_preempt)); 2057 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2058 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2059 continue; 2060 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2061 continue; 2062 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2063 if (ifa->ifa_addr->sa_family != addr->sa_family) 2064 continue; 2065 if (ifa->ifa_dstaddr != NULL && 2066 sa_equal(addr, ifa->ifa_dstaddr)) { 2067 goto done; 2068 } 2069 } 2070 } 2071 ifa = NULL; 2072 done: 2073 return (ifa); 2074 } 2075 2076 /* 2077 * Find an interface on a specific network. If many, choice 2078 * is most specific found. 2079 */ 2080 struct ifaddr * 2081 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2082 { 2083 struct ifnet *ifp; 2084 struct ifaddr *ifa; 2085 struct ifaddr *ifa_maybe = NULL; 2086 u_int af = addr->sa_family; 2087 const char *addr_data = addr->sa_data, *cplim; 2088 2089 MPASS(in_epoch(net_epoch_preempt)); 2090 /* 2091 * AF_LINK addresses can be looked up directly by their index number, 2092 * so do that if we can. 2093 */ 2094 if (af == AF_LINK) { 2095 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2096 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2097 return (ifaddr_byindex(sdl->sdl_index)); 2098 } 2099 2100 /* 2101 * Scan though each interface, looking for ones that have addresses 2102 * in this address family and the requested fib. 2103 */ 2104 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2105 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2106 continue; 2107 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2108 const char *cp, *cp2, *cp3; 2109 2110 if (ifa->ifa_addr->sa_family != af) 2111 next: continue; 2112 if (af == AF_INET && 2113 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2114 /* 2115 * This is a bit broken as it doesn't 2116 * take into account that the remote end may 2117 * be a single node in the network we are 2118 * looking for. 2119 * The trouble is that we don't know the 2120 * netmask for the remote end. 2121 */ 2122 if (ifa->ifa_dstaddr != NULL && 2123 sa_equal(addr, ifa->ifa_dstaddr)) { 2124 goto done; 2125 } 2126 } else { 2127 /* 2128 * Scan all the bits in the ifa's address. 2129 * If a bit dissagrees with what we are 2130 * looking for, mask it with the netmask 2131 * to see if it really matters. 2132 * (A byte at a time) 2133 */ 2134 if (ifa->ifa_netmask == 0) 2135 continue; 2136 cp = addr_data; 2137 cp2 = ifa->ifa_addr->sa_data; 2138 cp3 = ifa->ifa_netmask->sa_data; 2139 cplim = ifa->ifa_netmask->sa_len 2140 + (char *)ifa->ifa_netmask; 2141 while (cp3 < cplim) 2142 if ((*cp++ ^ *cp2++) & *cp3++) 2143 goto next; /* next address! */ 2144 /* 2145 * If the netmask of what we just found 2146 * is more specific than what we had before 2147 * (if we had one), or if the virtual status 2148 * of new prefix is better than of the old one, 2149 * then remember the new one before continuing 2150 * to search for an even better one. 2151 */ 2152 if (ifa_maybe == NULL || 2153 ifa_preferred(ifa_maybe, ifa) || 2154 rn_refines((caddr_t)ifa->ifa_netmask, 2155 (caddr_t)ifa_maybe->ifa_netmask)) { 2156 ifa_maybe = ifa; 2157 } 2158 } 2159 } 2160 } 2161 ifa = ifa_maybe; 2162 ifa_maybe = NULL; 2163 done: 2164 return (ifa); 2165 } 2166 2167 /* 2168 * Find an interface address specific to an interface best matching 2169 * a given address. 2170 */ 2171 struct ifaddr * 2172 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2173 { 2174 struct ifaddr *ifa; 2175 const char *cp, *cp2, *cp3; 2176 char *cplim; 2177 struct ifaddr *ifa_maybe = NULL; 2178 u_int af = addr->sa_family; 2179 2180 if (af >= AF_MAX) 2181 return (NULL); 2182 2183 MPASS(in_epoch(net_epoch_preempt)); 2184 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2185 if (ifa->ifa_addr->sa_family != af) 2186 continue; 2187 if (ifa_maybe == NULL) 2188 ifa_maybe = ifa; 2189 if (ifa->ifa_netmask == 0) { 2190 if (sa_equal(addr, ifa->ifa_addr) || 2191 (ifa->ifa_dstaddr && 2192 sa_equal(addr, ifa->ifa_dstaddr))) 2193 goto done; 2194 continue; 2195 } 2196 if (ifp->if_flags & IFF_POINTOPOINT) { 2197 if (sa_equal(addr, ifa->ifa_dstaddr)) 2198 goto done; 2199 } else { 2200 cp = addr->sa_data; 2201 cp2 = ifa->ifa_addr->sa_data; 2202 cp3 = ifa->ifa_netmask->sa_data; 2203 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2204 for (; cp3 < cplim; cp3++) 2205 if ((*cp++ ^ *cp2++) & *cp3) 2206 break; 2207 if (cp3 == cplim) 2208 goto done; 2209 } 2210 } 2211 ifa = ifa_maybe; 2212 done: 2213 return (ifa); 2214 } 2215 2216 /* 2217 * See whether new ifa is better than current one: 2218 * 1) A non-virtual one is preferred over virtual. 2219 * 2) A virtual in master state preferred over any other state. 2220 * 2221 * Used in several address selecting functions. 2222 */ 2223 int 2224 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2225 { 2226 2227 return (cur->ifa_carp && (!next->ifa_carp || 2228 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2229 } 2230 2231 struct sockaddr_dl * 2232 link_alloc_sdl(size_t size, int flags) 2233 { 2234 2235 return (malloc(size, M_TEMP, flags)); 2236 } 2237 2238 void 2239 link_free_sdl(struct sockaddr *sa) 2240 { 2241 free(sa, M_TEMP); 2242 } 2243 2244 /* 2245 * Fills in given sdl with interface basic info. 2246 * Returns pointer to filled sdl. 2247 */ 2248 struct sockaddr_dl * 2249 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2250 { 2251 struct sockaddr_dl *sdl; 2252 2253 sdl = (struct sockaddr_dl *)paddr; 2254 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2255 sdl->sdl_len = sizeof(struct sockaddr_dl); 2256 sdl->sdl_family = AF_LINK; 2257 sdl->sdl_index = ifp->if_index; 2258 sdl->sdl_type = iftype; 2259 2260 return (sdl); 2261 } 2262 2263 /* 2264 * Mark an interface down and notify protocols of 2265 * the transition. 2266 */ 2267 static void 2268 if_unroute(struct ifnet *ifp, int flag, int fam) 2269 { 2270 struct ifaddr *ifa; 2271 2272 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2273 2274 ifp->if_flags &= ~flag; 2275 getmicrotime(&ifp->if_lastchange); 2276 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2277 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2278 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2279 ifp->if_qflush(ifp); 2280 2281 if (ifp->if_carp) 2282 (*carp_linkstate_p)(ifp); 2283 rt_ifmsg(ifp); 2284 } 2285 2286 /* 2287 * Mark an interface up and notify protocols of 2288 * the transition. 2289 */ 2290 static void 2291 if_route(struct ifnet *ifp, int flag, int fam) 2292 { 2293 struct ifaddr *ifa; 2294 2295 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2296 2297 ifp->if_flags |= flag; 2298 getmicrotime(&ifp->if_lastchange); 2299 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2300 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2301 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2302 if (ifp->if_carp) 2303 (*carp_linkstate_p)(ifp); 2304 rt_ifmsg(ifp); 2305 #ifdef INET6 2306 in6_if_up(ifp); 2307 #endif 2308 } 2309 2310 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2311 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2312 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2313 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2314 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2315 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2316 int (*vlan_setcookie_p)(struct ifnet *, void *); 2317 void *(*vlan_cookie_p)(struct ifnet *); 2318 2319 /* 2320 * Handle a change in the interface link state. To avoid LORs 2321 * between driver lock and upper layer locks, as well as possible 2322 * recursions, we post event to taskqueue, and all job 2323 * is done in static do_link_state_change(). 2324 */ 2325 void 2326 if_link_state_change(struct ifnet *ifp, int link_state) 2327 { 2328 /* Return if state hasn't changed. */ 2329 if (ifp->if_link_state == link_state) 2330 return; 2331 2332 ifp->if_link_state = link_state; 2333 2334 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2335 } 2336 2337 static void 2338 do_link_state_change(void *arg, int pending) 2339 { 2340 struct ifnet *ifp = (struct ifnet *)arg; 2341 int link_state = ifp->if_link_state; 2342 CURVNET_SET(ifp->if_vnet); 2343 2344 /* Notify that the link state has changed. */ 2345 rt_ifmsg(ifp); 2346 if (ifp->if_vlantrunk != NULL) 2347 (*vlan_link_state_p)(ifp); 2348 2349 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2350 ifp->if_l2com != NULL) 2351 (*ng_ether_link_state_p)(ifp, link_state); 2352 if (ifp->if_carp) 2353 (*carp_linkstate_p)(ifp); 2354 if (ifp->if_bridge) 2355 ifp->if_bridge_linkstate(ifp); 2356 if (ifp->if_lagg) 2357 (*lagg_linkstate_p)(ifp, link_state); 2358 2359 if (IS_DEFAULT_VNET(curvnet)) 2360 devctl_notify("IFNET", ifp->if_xname, 2361 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2362 NULL); 2363 if (pending > 1) 2364 if_printf(ifp, "%d link states coalesced\n", pending); 2365 if (log_link_state_change) 2366 if_printf(ifp, "link state changed to %s\n", 2367 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2368 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2369 CURVNET_RESTORE(); 2370 } 2371 2372 /* 2373 * Mark an interface down and notify protocols of 2374 * the transition. 2375 */ 2376 void 2377 if_down(struct ifnet *ifp) 2378 { 2379 2380 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2381 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2382 } 2383 2384 /* 2385 * Mark an interface up and notify protocols of 2386 * the transition. 2387 */ 2388 void 2389 if_up(struct ifnet *ifp) 2390 { 2391 2392 if_route(ifp, IFF_UP, AF_UNSPEC); 2393 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2394 } 2395 2396 /* 2397 * Flush an interface queue. 2398 */ 2399 void 2400 if_qflush(struct ifnet *ifp) 2401 { 2402 struct mbuf *m, *n; 2403 struct ifaltq *ifq; 2404 2405 ifq = &ifp->if_snd; 2406 IFQ_LOCK(ifq); 2407 #ifdef ALTQ 2408 if (ALTQ_IS_ENABLED(ifq)) 2409 ALTQ_PURGE(ifq); 2410 #endif 2411 n = ifq->ifq_head; 2412 while ((m = n) != NULL) { 2413 n = m->m_nextpkt; 2414 m_freem(m); 2415 } 2416 ifq->ifq_head = 0; 2417 ifq->ifq_tail = 0; 2418 ifq->ifq_len = 0; 2419 IFQ_UNLOCK(ifq); 2420 } 2421 2422 /* 2423 * Map interface name to interface structure pointer, with or without 2424 * returning a reference. 2425 */ 2426 struct ifnet * 2427 ifunit_ref(const char *name) 2428 { 2429 struct epoch_tracker et; 2430 struct ifnet *ifp; 2431 2432 NET_EPOCH_ENTER(et); 2433 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2434 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2435 !(ifp->if_flags & IFF_DYING)) 2436 break; 2437 } 2438 if (ifp != NULL) 2439 if_ref(ifp); 2440 NET_EPOCH_EXIT(et); 2441 return (ifp); 2442 } 2443 2444 struct ifnet * 2445 ifunit(const char *name) 2446 { 2447 struct epoch_tracker et; 2448 struct ifnet *ifp; 2449 2450 NET_EPOCH_ENTER(et); 2451 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2452 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2453 break; 2454 } 2455 NET_EPOCH_EXIT(et); 2456 return (ifp); 2457 } 2458 2459 static void * 2460 ifr_buffer_get_buffer(void *data) 2461 { 2462 union ifreq_union *ifrup; 2463 2464 ifrup = data; 2465 #ifdef COMPAT_FREEBSD32 2466 if (SV_CURPROC_FLAG(SV_ILP32)) 2467 return ((void *)(uintptr_t) 2468 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2469 #endif 2470 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2471 } 2472 2473 static void 2474 ifr_buffer_set_buffer_null(void *data) 2475 { 2476 union ifreq_union *ifrup; 2477 2478 ifrup = data; 2479 #ifdef COMPAT_FREEBSD32 2480 if (SV_CURPROC_FLAG(SV_ILP32)) 2481 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2482 else 2483 #endif 2484 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2485 } 2486 2487 static size_t 2488 ifr_buffer_get_length(void *data) 2489 { 2490 union ifreq_union *ifrup; 2491 2492 ifrup = data; 2493 #ifdef COMPAT_FREEBSD32 2494 if (SV_CURPROC_FLAG(SV_ILP32)) 2495 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2496 #endif 2497 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2498 } 2499 2500 static void 2501 ifr_buffer_set_length(void *data, size_t len) 2502 { 2503 union ifreq_union *ifrup; 2504 2505 ifrup = data; 2506 #ifdef COMPAT_FREEBSD32 2507 if (SV_CURPROC_FLAG(SV_ILP32)) 2508 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2509 else 2510 #endif 2511 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2512 } 2513 2514 void * 2515 ifr_data_get_ptr(void *ifrp) 2516 { 2517 union ifreq_union *ifrup; 2518 2519 ifrup = ifrp; 2520 #ifdef COMPAT_FREEBSD32 2521 if (SV_CURPROC_FLAG(SV_ILP32)) 2522 return ((void *)(uintptr_t) 2523 ifrup->ifr32.ifr_ifru.ifru_data); 2524 #endif 2525 return (ifrup->ifr.ifr_ifru.ifru_data); 2526 } 2527 2528 /* 2529 * Hardware specific interface ioctls. 2530 */ 2531 int 2532 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2533 { 2534 struct ifreq *ifr; 2535 int error = 0, do_ifup = 0; 2536 int new_flags, temp_flags; 2537 size_t namelen, onamelen; 2538 size_t descrlen; 2539 char *descrbuf, *odescrbuf; 2540 char new_name[IFNAMSIZ]; 2541 struct ifaddr *ifa; 2542 struct sockaddr_dl *sdl; 2543 2544 ifr = (struct ifreq *)data; 2545 switch (cmd) { 2546 case SIOCGIFINDEX: 2547 ifr->ifr_index = ifp->if_index; 2548 break; 2549 2550 case SIOCGIFFLAGS: 2551 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2552 ifr->ifr_flags = temp_flags & 0xffff; 2553 ifr->ifr_flagshigh = temp_flags >> 16; 2554 break; 2555 2556 case SIOCGIFCAP: 2557 ifr->ifr_reqcap = ifp->if_capabilities; 2558 ifr->ifr_curcap = ifp->if_capenable; 2559 break; 2560 2561 #ifdef MAC 2562 case SIOCGIFMAC: 2563 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2564 break; 2565 #endif 2566 2567 case SIOCGIFMETRIC: 2568 ifr->ifr_metric = ifp->if_metric; 2569 break; 2570 2571 case SIOCGIFMTU: 2572 ifr->ifr_mtu = ifp->if_mtu; 2573 break; 2574 2575 case SIOCGIFPHYS: 2576 /* XXXGL: did this ever worked? */ 2577 ifr->ifr_phys = 0; 2578 break; 2579 2580 case SIOCGIFDESCR: 2581 error = 0; 2582 sx_slock(&ifdescr_sx); 2583 if (ifp->if_description == NULL) 2584 error = ENOMSG; 2585 else { 2586 /* space for terminating nul */ 2587 descrlen = strlen(ifp->if_description) + 1; 2588 if (ifr_buffer_get_length(ifr) < descrlen) 2589 ifr_buffer_set_buffer_null(ifr); 2590 else 2591 error = copyout(ifp->if_description, 2592 ifr_buffer_get_buffer(ifr), descrlen); 2593 ifr_buffer_set_length(ifr, descrlen); 2594 } 2595 sx_sunlock(&ifdescr_sx); 2596 break; 2597 2598 case SIOCSIFDESCR: 2599 error = priv_check(td, PRIV_NET_SETIFDESCR); 2600 if (error) 2601 return (error); 2602 2603 /* 2604 * Copy only (length-1) bytes to make sure that 2605 * if_description is always nul terminated. The 2606 * length parameter is supposed to count the 2607 * terminating nul in. 2608 */ 2609 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2610 return (ENAMETOOLONG); 2611 else if (ifr_buffer_get_length(ifr) == 0) 2612 descrbuf = NULL; 2613 else { 2614 descrbuf = malloc(ifr_buffer_get_length(ifr), 2615 M_IFDESCR, M_WAITOK | M_ZERO); 2616 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2617 ifr_buffer_get_length(ifr) - 1); 2618 if (error) { 2619 free(descrbuf, M_IFDESCR); 2620 break; 2621 } 2622 } 2623 2624 sx_xlock(&ifdescr_sx); 2625 odescrbuf = ifp->if_description; 2626 ifp->if_description = descrbuf; 2627 sx_xunlock(&ifdescr_sx); 2628 2629 getmicrotime(&ifp->if_lastchange); 2630 free(odescrbuf, M_IFDESCR); 2631 break; 2632 2633 case SIOCGIFFIB: 2634 ifr->ifr_fib = ifp->if_fib; 2635 break; 2636 2637 case SIOCSIFFIB: 2638 error = priv_check(td, PRIV_NET_SETIFFIB); 2639 if (error) 2640 return (error); 2641 if (ifr->ifr_fib >= rt_numfibs) 2642 return (EINVAL); 2643 2644 ifp->if_fib = ifr->ifr_fib; 2645 break; 2646 2647 case SIOCSIFFLAGS: 2648 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2649 if (error) 2650 return (error); 2651 /* 2652 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2653 * check, so we don't need special handling here yet. 2654 */ 2655 new_flags = (ifr->ifr_flags & 0xffff) | 2656 (ifr->ifr_flagshigh << 16); 2657 if (ifp->if_flags & IFF_UP && 2658 (new_flags & IFF_UP) == 0) { 2659 if_down(ifp); 2660 } else if (new_flags & IFF_UP && 2661 (ifp->if_flags & IFF_UP) == 0) { 2662 do_ifup = 1; 2663 } 2664 /* See if permanently promiscuous mode bit is about to flip */ 2665 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2666 if (new_flags & IFF_PPROMISC) 2667 ifp->if_flags |= IFF_PROMISC; 2668 else if (ifp->if_pcount == 0) 2669 ifp->if_flags &= ~IFF_PROMISC; 2670 if (log_promisc_mode_change) 2671 if_printf(ifp, "permanently promiscuous mode %s\n", 2672 ((new_flags & IFF_PPROMISC) ? 2673 "enabled" : "disabled")); 2674 } 2675 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2676 (new_flags &~ IFF_CANTCHANGE); 2677 if (ifp->if_ioctl) { 2678 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2679 } 2680 if (do_ifup) 2681 if_up(ifp); 2682 getmicrotime(&ifp->if_lastchange); 2683 break; 2684 2685 case SIOCSIFCAP: 2686 error = priv_check(td, PRIV_NET_SETIFCAP); 2687 if (error) 2688 return (error); 2689 if (ifp->if_ioctl == NULL) 2690 return (EOPNOTSUPP); 2691 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2692 return (EINVAL); 2693 error = (*ifp->if_ioctl)(ifp, cmd, data); 2694 if (error == 0) 2695 getmicrotime(&ifp->if_lastchange); 2696 break; 2697 2698 #ifdef MAC 2699 case SIOCSIFMAC: 2700 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2701 break; 2702 #endif 2703 2704 case SIOCSIFNAME: 2705 error = priv_check(td, PRIV_NET_SETIFNAME); 2706 if (error) 2707 return (error); 2708 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2709 NULL); 2710 if (error != 0) 2711 return (error); 2712 if (new_name[0] == '\0') 2713 return (EINVAL); 2714 if (new_name[IFNAMSIZ-1] != '\0') { 2715 new_name[IFNAMSIZ-1] = '\0'; 2716 if (strlen(new_name) == IFNAMSIZ-1) 2717 return (EINVAL); 2718 } 2719 if (strcmp(new_name, ifp->if_xname) == 0) 2720 break; 2721 if (ifunit(new_name) != NULL) 2722 return (EEXIST); 2723 2724 /* 2725 * XXX: Locking. Nothing else seems to lock if_flags, 2726 * and there are numerous other races with the 2727 * ifunit() checks not being atomic with namespace 2728 * changes (renames, vmoves, if_attach, etc). 2729 */ 2730 ifp->if_flags |= IFF_RENAMING; 2731 2732 /* Announce the departure of the interface. */ 2733 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2734 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2735 2736 if_printf(ifp, "changing name to '%s'\n", new_name); 2737 2738 IF_ADDR_WLOCK(ifp); 2739 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2740 ifa = ifp->if_addr; 2741 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2742 namelen = strlen(new_name); 2743 onamelen = sdl->sdl_nlen; 2744 /* 2745 * Move the address if needed. This is safe because we 2746 * allocate space for a name of length IFNAMSIZ when we 2747 * create this in if_attach(). 2748 */ 2749 if (namelen != onamelen) { 2750 bcopy(sdl->sdl_data + onamelen, 2751 sdl->sdl_data + namelen, sdl->sdl_alen); 2752 } 2753 bcopy(new_name, sdl->sdl_data, namelen); 2754 sdl->sdl_nlen = namelen; 2755 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2756 bzero(sdl->sdl_data, onamelen); 2757 while (namelen != 0) 2758 sdl->sdl_data[--namelen] = 0xff; 2759 IF_ADDR_WUNLOCK(ifp); 2760 2761 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2762 /* Announce the return of the interface. */ 2763 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2764 2765 ifp->if_flags &= ~IFF_RENAMING; 2766 break; 2767 2768 #ifdef VIMAGE 2769 case SIOCSIFVNET: 2770 error = priv_check(td, PRIV_NET_SETIFVNET); 2771 if (error) 2772 return (error); 2773 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2774 break; 2775 #endif 2776 2777 case SIOCSIFMETRIC: 2778 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2779 if (error) 2780 return (error); 2781 ifp->if_metric = ifr->ifr_metric; 2782 getmicrotime(&ifp->if_lastchange); 2783 break; 2784 2785 case SIOCSIFPHYS: 2786 error = priv_check(td, PRIV_NET_SETIFPHYS); 2787 if (error) 2788 return (error); 2789 if (ifp->if_ioctl == NULL) 2790 return (EOPNOTSUPP); 2791 error = (*ifp->if_ioctl)(ifp, cmd, data); 2792 if (error == 0) 2793 getmicrotime(&ifp->if_lastchange); 2794 break; 2795 2796 case SIOCSIFMTU: 2797 { 2798 u_long oldmtu = ifp->if_mtu; 2799 2800 error = priv_check(td, PRIV_NET_SETIFMTU); 2801 if (error) 2802 return (error); 2803 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2804 return (EINVAL); 2805 if (ifp->if_ioctl == NULL) 2806 return (EOPNOTSUPP); 2807 error = (*ifp->if_ioctl)(ifp, cmd, data); 2808 if (error == 0) { 2809 getmicrotime(&ifp->if_lastchange); 2810 rt_ifmsg(ifp); 2811 #ifdef INET 2812 NETDUMP_REINIT(ifp); 2813 #endif 2814 } 2815 /* 2816 * If the link MTU changed, do network layer specific procedure. 2817 */ 2818 if (ifp->if_mtu != oldmtu) { 2819 #ifdef INET6 2820 nd6_setmtu(ifp); 2821 #endif 2822 rt_updatemtu(ifp); 2823 } 2824 break; 2825 } 2826 2827 case SIOCADDMULTI: 2828 case SIOCDELMULTI: 2829 if (cmd == SIOCADDMULTI) 2830 error = priv_check(td, PRIV_NET_ADDMULTI); 2831 else 2832 error = priv_check(td, PRIV_NET_DELMULTI); 2833 if (error) 2834 return (error); 2835 2836 /* Don't allow group membership on non-multicast interfaces. */ 2837 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2838 return (EOPNOTSUPP); 2839 2840 /* Don't let users screw up protocols' entries. */ 2841 if (ifr->ifr_addr.sa_family != AF_LINK) 2842 return (EINVAL); 2843 2844 if (cmd == SIOCADDMULTI) { 2845 struct epoch_tracker et; 2846 struct ifmultiaddr *ifma; 2847 2848 /* 2849 * Userland is only permitted to join groups once 2850 * via the if_addmulti() KPI, because it cannot hold 2851 * struct ifmultiaddr * between calls. It may also 2852 * lose a race while we check if the membership 2853 * already exists. 2854 */ 2855 NET_EPOCH_ENTER(et); 2856 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2857 NET_EPOCH_EXIT(et); 2858 if (ifma != NULL) 2859 error = EADDRINUSE; 2860 else 2861 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2862 } else { 2863 error = if_delmulti(ifp, &ifr->ifr_addr); 2864 } 2865 if (error == 0) 2866 getmicrotime(&ifp->if_lastchange); 2867 break; 2868 2869 case SIOCSIFPHYADDR: 2870 case SIOCDIFPHYADDR: 2871 #ifdef INET6 2872 case SIOCSIFPHYADDR_IN6: 2873 #endif 2874 case SIOCSIFMEDIA: 2875 case SIOCSIFGENERIC: 2876 error = priv_check(td, PRIV_NET_HWIOCTL); 2877 if (error) 2878 return (error); 2879 if (ifp->if_ioctl == NULL) 2880 return (EOPNOTSUPP); 2881 error = (*ifp->if_ioctl)(ifp, cmd, data); 2882 if (error == 0) 2883 getmicrotime(&ifp->if_lastchange); 2884 break; 2885 2886 case SIOCGIFSTATUS: 2887 case SIOCGIFPSRCADDR: 2888 case SIOCGIFPDSTADDR: 2889 case SIOCGIFMEDIA: 2890 case SIOCGIFXMEDIA: 2891 case SIOCGIFGENERIC: 2892 case SIOCGIFRSSKEY: 2893 case SIOCGIFRSSHASH: 2894 if (ifp->if_ioctl == NULL) 2895 return (EOPNOTSUPP); 2896 error = (*ifp->if_ioctl)(ifp, cmd, data); 2897 break; 2898 2899 case SIOCSIFLLADDR: 2900 error = priv_check(td, PRIV_NET_SETLLADDR); 2901 if (error) 2902 return (error); 2903 error = if_setlladdr(ifp, 2904 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2905 break; 2906 2907 case SIOCGHWADDR: 2908 error = if_gethwaddr(ifp, ifr); 2909 break; 2910 2911 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2912 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2913 if (error) 2914 return (error); 2915 if ((error = if_addgroup(ifp, 2916 ifgr_group_get((struct ifgroupreq *)data)))) 2917 return (error); 2918 break; 2919 2920 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2921 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2922 return (error); 2923 break; 2924 2925 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2926 error = priv_check(td, PRIV_NET_DELIFGROUP); 2927 if (error) 2928 return (error); 2929 if ((error = if_delgroup(ifp, 2930 ifgr_group_get((struct ifgroupreq *)data)))) 2931 return (error); 2932 break; 2933 2934 default: 2935 error = ENOIOCTL; 2936 break; 2937 } 2938 return (error); 2939 } 2940 2941 #ifdef COMPAT_FREEBSD32 2942 struct ifconf32 { 2943 int32_t ifc_len; 2944 union { 2945 uint32_t ifcu_buf; 2946 uint32_t ifcu_req; 2947 } ifc_ifcu; 2948 }; 2949 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2950 #endif 2951 2952 #ifdef COMPAT_FREEBSD32 2953 static void 2954 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2955 { 2956 struct ifmediareq32 *ifmr32; 2957 2958 ifmr32 = (struct ifmediareq32 *)data; 2959 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2960 sizeof(ifmr->ifm_name)); 2961 ifmr->ifm_current = ifmr32->ifm_current; 2962 ifmr->ifm_mask = ifmr32->ifm_mask; 2963 ifmr->ifm_status = ifmr32->ifm_status; 2964 ifmr->ifm_active = ifmr32->ifm_active; 2965 ifmr->ifm_count = ifmr32->ifm_count; 2966 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2967 } 2968 2969 static void 2970 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2971 { 2972 struct ifmediareq32 *ifmr32; 2973 2974 ifmr32 = (struct ifmediareq32 *)data; 2975 ifmr32->ifm_current = ifmr->ifm_current; 2976 ifmr32->ifm_mask = ifmr->ifm_mask; 2977 ifmr32->ifm_status = ifmr->ifm_status; 2978 ifmr32->ifm_active = ifmr->ifm_active; 2979 ifmr32->ifm_count = ifmr->ifm_count; 2980 } 2981 #endif 2982 2983 /* 2984 * Interface ioctls. 2985 */ 2986 int 2987 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2988 { 2989 #ifdef COMPAT_FREEBSD32 2990 caddr_t saved_data = NULL; 2991 struct ifmediareq ifmr; 2992 struct ifmediareq *ifmrp; 2993 #endif 2994 struct ifnet *ifp; 2995 struct ifreq *ifr; 2996 int error; 2997 int oif_flags; 2998 #ifdef VIMAGE 2999 int shutdown; 3000 #endif 3001 3002 CURVNET_SET(so->so_vnet); 3003 #ifdef VIMAGE 3004 /* Make sure the VNET is stable. */ 3005 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 3006 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 3007 if (shutdown) { 3008 CURVNET_RESTORE(); 3009 return (EBUSY); 3010 } 3011 #endif 3012 3013 3014 switch (cmd) { 3015 case SIOCGIFCONF: 3016 error = ifconf(cmd, data); 3017 CURVNET_RESTORE(); 3018 return (error); 3019 3020 #ifdef COMPAT_FREEBSD32 3021 case SIOCGIFCONF32: 3022 { 3023 struct ifconf32 *ifc32; 3024 struct ifconf ifc; 3025 3026 ifc32 = (struct ifconf32 *)data; 3027 ifc.ifc_len = ifc32->ifc_len; 3028 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3029 3030 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3031 CURVNET_RESTORE(); 3032 if (error == 0) 3033 ifc32->ifc_len = ifc.ifc_len; 3034 return (error); 3035 } 3036 #endif 3037 } 3038 3039 #ifdef COMPAT_FREEBSD32 3040 ifmrp = NULL; 3041 switch (cmd) { 3042 case SIOCGIFMEDIA32: 3043 case SIOCGIFXMEDIA32: 3044 ifmrp = &ifmr; 3045 ifmr_init(ifmrp, data); 3046 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3047 saved_data = data; 3048 data = (caddr_t)ifmrp; 3049 } 3050 #endif 3051 3052 ifr = (struct ifreq *)data; 3053 switch (cmd) { 3054 #ifdef VIMAGE 3055 case SIOCSIFRVNET: 3056 error = priv_check(td, PRIV_NET_SETIFVNET); 3057 if (error == 0) 3058 error = if_vmove_reclaim(td, ifr->ifr_name, 3059 ifr->ifr_jid); 3060 goto out_noref; 3061 #endif 3062 case SIOCIFCREATE: 3063 case SIOCIFCREATE2: 3064 error = priv_check(td, PRIV_NET_IFCREATE); 3065 if (error == 0) 3066 error = if_clone_create(ifr->ifr_name, 3067 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3068 ifr_data_get_ptr(ifr) : NULL); 3069 goto out_noref; 3070 case SIOCIFDESTROY: 3071 error = priv_check(td, PRIV_NET_IFDESTROY); 3072 if (error == 0) 3073 error = if_clone_destroy(ifr->ifr_name); 3074 goto out_noref; 3075 3076 case SIOCIFGCLONERS: 3077 error = if_clone_list((struct if_clonereq *)data); 3078 goto out_noref; 3079 3080 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3081 error = if_getgroupmembers((struct ifgroupreq *)data); 3082 goto out_noref; 3083 3084 #if defined(INET) || defined(INET6) 3085 case SIOCSVH: 3086 case SIOCGVH: 3087 if (carp_ioctl_p == NULL) 3088 error = EPROTONOSUPPORT; 3089 else 3090 error = (*carp_ioctl_p)(ifr, cmd, td); 3091 goto out_noref; 3092 #endif 3093 } 3094 3095 ifp = ifunit_ref(ifr->ifr_name); 3096 if (ifp == NULL) { 3097 error = ENXIO; 3098 goto out_noref; 3099 } 3100 3101 error = ifhwioctl(cmd, ifp, data, td); 3102 if (error != ENOIOCTL) 3103 goto out_ref; 3104 3105 oif_flags = ifp->if_flags; 3106 if (so->so_proto == NULL) { 3107 error = EOPNOTSUPP; 3108 goto out_ref; 3109 } 3110 3111 /* 3112 * Pass the request on to the socket control method, and if the 3113 * latter returns EOPNOTSUPP, directly to the interface. 3114 * 3115 * Make an exception for the legacy SIOCSIF* requests. Drivers 3116 * trust SIOCSIFADDR et al to come from an already privileged 3117 * layer, and do not perform any credentials checks or input 3118 * validation. 3119 */ 3120 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3121 ifp, td)); 3122 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3123 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3124 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3125 error = (*ifp->if_ioctl)(ifp, cmd, data); 3126 3127 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3128 #ifdef INET6 3129 if (ifp->if_flags & IFF_UP) 3130 in6_if_up(ifp); 3131 #endif 3132 } 3133 3134 out_ref: 3135 if_rele(ifp); 3136 out_noref: 3137 #ifdef COMPAT_FREEBSD32 3138 if (ifmrp != NULL) { 3139 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3140 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3141 cmd)); 3142 data = saved_data; 3143 ifmr_update(ifmrp, data); 3144 } 3145 #endif 3146 CURVNET_RESTORE(); 3147 return (error); 3148 } 3149 3150 /* 3151 * The code common to handling reference counted flags, 3152 * e.g., in ifpromisc() and if_allmulti(). 3153 * The "pflag" argument can specify a permanent mode flag to check, 3154 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3155 * 3156 * Only to be used on stack-owned flags, not driver-owned flags. 3157 */ 3158 static int 3159 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3160 { 3161 struct ifreq ifr; 3162 int error; 3163 int oldflags, oldcount; 3164 3165 /* Sanity checks to catch programming errors */ 3166 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3167 ("%s: setting driver-owned flag %d", __func__, flag)); 3168 3169 if (onswitch) 3170 KASSERT(*refcount >= 0, 3171 ("%s: increment negative refcount %d for flag %d", 3172 __func__, *refcount, flag)); 3173 else 3174 KASSERT(*refcount > 0, 3175 ("%s: decrement non-positive refcount %d for flag %d", 3176 __func__, *refcount, flag)); 3177 3178 /* In case this mode is permanent, just touch refcount */ 3179 if (ifp->if_flags & pflag) { 3180 *refcount += onswitch ? 1 : -1; 3181 return (0); 3182 } 3183 3184 /* Save ifnet parameters for if_ioctl() may fail */ 3185 oldcount = *refcount; 3186 oldflags = ifp->if_flags; 3187 3188 /* 3189 * See if we aren't the only and touching refcount is enough. 3190 * Actually toggle interface flag if we are the first or last. 3191 */ 3192 if (onswitch) { 3193 if ((*refcount)++) 3194 return (0); 3195 ifp->if_flags |= flag; 3196 } else { 3197 if (--(*refcount)) 3198 return (0); 3199 ifp->if_flags &= ~flag; 3200 } 3201 3202 /* Call down the driver since we've changed interface flags */ 3203 if (ifp->if_ioctl == NULL) { 3204 error = EOPNOTSUPP; 3205 goto recover; 3206 } 3207 ifr.ifr_flags = ifp->if_flags & 0xffff; 3208 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3209 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3210 if (error) 3211 goto recover; 3212 /* Notify userland that interface flags have changed */ 3213 rt_ifmsg(ifp); 3214 return (0); 3215 3216 recover: 3217 /* Recover after driver error */ 3218 *refcount = oldcount; 3219 ifp->if_flags = oldflags; 3220 return (error); 3221 } 3222 3223 /* 3224 * Set/clear promiscuous mode on interface ifp based on the truth value 3225 * of pswitch. The calls are reference counted so that only the first 3226 * "on" request actually has an effect, as does the final "off" request. 3227 * Results are undefined if the "off" and "on" requests are not matched. 3228 */ 3229 int 3230 ifpromisc(struct ifnet *ifp, int pswitch) 3231 { 3232 int error; 3233 int oldflags = ifp->if_flags; 3234 3235 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3236 &ifp->if_pcount, pswitch); 3237 /* If promiscuous mode status has changed, log a message */ 3238 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3239 log_promisc_mode_change) 3240 if_printf(ifp, "promiscuous mode %s\n", 3241 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3242 return (error); 3243 } 3244 3245 /* 3246 * Return interface configuration 3247 * of system. List may be used 3248 * in later ioctl's (above) to get 3249 * other information. 3250 */ 3251 /*ARGSUSED*/ 3252 static int 3253 ifconf(u_long cmd, caddr_t data) 3254 { 3255 struct ifconf *ifc = (struct ifconf *)data; 3256 struct ifnet *ifp; 3257 struct ifaddr *ifa; 3258 struct ifreq ifr; 3259 struct sbuf *sb; 3260 int error, full = 0, valid_len, max_len; 3261 3262 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3263 max_len = MAXPHYS - 1; 3264 3265 /* Prevent hostile input from being able to crash the system */ 3266 if (ifc->ifc_len <= 0) 3267 return (EINVAL); 3268 3269 again: 3270 if (ifc->ifc_len <= max_len) { 3271 max_len = ifc->ifc_len; 3272 full = 1; 3273 } 3274 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3275 max_len = 0; 3276 valid_len = 0; 3277 3278 IFNET_RLOCK(); 3279 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3280 struct epoch_tracker et; 3281 int addrs; 3282 3283 /* 3284 * Zero the ifr to make sure we don't disclose the contents 3285 * of the stack. 3286 */ 3287 memset(&ifr, 0, sizeof(ifr)); 3288 3289 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3290 >= sizeof(ifr.ifr_name)) { 3291 sbuf_delete(sb); 3292 IFNET_RUNLOCK(); 3293 return (ENAMETOOLONG); 3294 } 3295 3296 addrs = 0; 3297 NET_EPOCH_ENTER(et); 3298 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3299 struct sockaddr *sa = ifa->ifa_addr; 3300 3301 if (prison_if(curthread->td_ucred, sa) != 0) 3302 continue; 3303 addrs++; 3304 if (sa->sa_len <= sizeof(*sa)) { 3305 if (sa->sa_len < sizeof(*sa)) { 3306 memset(&ifr.ifr_ifru.ifru_addr, 0, 3307 sizeof(ifr.ifr_ifru.ifru_addr)); 3308 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3309 sa->sa_len); 3310 } else 3311 ifr.ifr_ifru.ifru_addr = *sa; 3312 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3313 max_len += sizeof(ifr); 3314 } else { 3315 sbuf_bcat(sb, &ifr, 3316 offsetof(struct ifreq, ifr_addr)); 3317 max_len += offsetof(struct ifreq, ifr_addr); 3318 sbuf_bcat(sb, sa, sa->sa_len); 3319 max_len += sa->sa_len; 3320 } 3321 3322 if (sbuf_error(sb) == 0) 3323 valid_len = sbuf_len(sb); 3324 } 3325 NET_EPOCH_EXIT(et); 3326 if (addrs == 0) { 3327 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3328 max_len += sizeof(ifr); 3329 3330 if (sbuf_error(sb) == 0) 3331 valid_len = sbuf_len(sb); 3332 } 3333 } 3334 IFNET_RUNLOCK(); 3335 3336 /* 3337 * If we didn't allocate enough space (uncommon), try again. If 3338 * we have already allocated as much space as we are allowed, 3339 * return what we've got. 3340 */ 3341 if (valid_len != max_len && !full) { 3342 sbuf_delete(sb); 3343 goto again; 3344 } 3345 3346 ifc->ifc_len = valid_len; 3347 sbuf_finish(sb); 3348 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3349 sbuf_delete(sb); 3350 return (error); 3351 } 3352 3353 /* 3354 * Just like ifpromisc(), but for all-multicast-reception mode. 3355 */ 3356 int 3357 if_allmulti(struct ifnet *ifp, int onswitch) 3358 { 3359 3360 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3361 } 3362 3363 struct ifmultiaddr * 3364 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3365 { 3366 struct ifmultiaddr *ifma; 3367 3368 IF_ADDR_LOCK_ASSERT(ifp); 3369 3370 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3371 if (sa->sa_family == AF_LINK) { 3372 if (sa_dl_equal(ifma->ifma_addr, sa)) 3373 break; 3374 } else { 3375 if (sa_equal(ifma->ifma_addr, sa)) 3376 break; 3377 } 3378 } 3379 3380 return ifma; 3381 } 3382 3383 /* 3384 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3385 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3386 * the ifnet multicast address list here, so the caller must do that and 3387 * other setup work (such as notifying the device driver). The reference 3388 * count is initialized to 1. 3389 */ 3390 static struct ifmultiaddr * 3391 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3392 int mflags) 3393 { 3394 struct ifmultiaddr *ifma; 3395 struct sockaddr *dupsa; 3396 3397 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3398 M_ZERO); 3399 if (ifma == NULL) 3400 return (NULL); 3401 3402 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3403 if (dupsa == NULL) { 3404 free(ifma, M_IFMADDR); 3405 return (NULL); 3406 } 3407 bcopy(sa, dupsa, sa->sa_len); 3408 ifma->ifma_addr = dupsa; 3409 3410 ifma->ifma_ifp = ifp; 3411 ifma->ifma_refcount = 1; 3412 ifma->ifma_protospec = NULL; 3413 3414 if (llsa == NULL) { 3415 ifma->ifma_lladdr = NULL; 3416 return (ifma); 3417 } 3418 3419 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3420 if (dupsa == NULL) { 3421 free(ifma->ifma_addr, M_IFMADDR); 3422 free(ifma, M_IFMADDR); 3423 return (NULL); 3424 } 3425 bcopy(llsa, dupsa, llsa->sa_len); 3426 ifma->ifma_lladdr = dupsa; 3427 3428 return (ifma); 3429 } 3430 3431 /* 3432 * if_freemulti: free ifmultiaddr structure and possibly attached related 3433 * addresses. The caller is responsible for implementing reference 3434 * counting, notifying the driver, handling routing messages, and releasing 3435 * any dependent link layer state. 3436 */ 3437 #ifdef MCAST_VERBOSE 3438 extern void kdb_backtrace(void); 3439 #endif 3440 static void 3441 if_freemulti_internal(struct ifmultiaddr *ifma) 3442 { 3443 3444 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3445 ifma->ifma_refcount)); 3446 3447 if (ifma->ifma_lladdr != NULL) 3448 free(ifma->ifma_lladdr, M_IFMADDR); 3449 #ifdef MCAST_VERBOSE 3450 kdb_backtrace(); 3451 printf("%s freeing ifma: %p\n", __func__, ifma); 3452 #endif 3453 free(ifma->ifma_addr, M_IFMADDR); 3454 free(ifma, M_IFMADDR); 3455 } 3456 3457 static void 3458 if_destroymulti(epoch_context_t ctx) 3459 { 3460 struct ifmultiaddr *ifma; 3461 3462 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3463 if_freemulti_internal(ifma); 3464 } 3465 3466 void 3467 if_freemulti(struct ifmultiaddr *ifma) 3468 { 3469 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3470 ifma->ifma_refcount)); 3471 3472 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3473 } 3474 3475 3476 /* 3477 * Register an additional multicast address with a network interface. 3478 * 3479 * - If the address is already present, bump the reference count on the 3480 * address and return. 3481 * - If the address is not link-layer, look up a link layer address. 3482 * - Allocate address structures for one or both addresses, and attach to the 3483 * multicast address list on the interface. If automatically adding a link 3484 * layer address, the protocol address will own a reference to the link 3485 * layer address, to be freed when it is freed. 3486 * - Notify the network device driver of an addition to the multicast address 3487 * list. 3488 * 3489 * 'sa' points to caller-owned memory with the desired multicast address. 3490 * 3491 * 'retifma' will be used to return a pointer to the resulting multicast 3492 * address reference, if desired. 3493 */ 3494 int 3495 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3496 struct ifmultiaddr **retifma) 3497 { 3498 struct ifmultiaddr *ifma, *ll_ifma; 3499 struct sockaddr *llsa; 3500 struct sockaddr_dl sdl; 3501 int error; 3502 3503 #ifdef INET 3504 IN_MULTI_LIST_UNLOCK_ASSERT(); 3505 #endif 3506 #ifdef INET6 3507 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3508 #endif 3509 /* 3510 * If the address is already present, return a new reference to it; 3511 * otherwise, allocate storage and set up a new address. 3512 */ 3513 IF_ADDR_WLOCK(ifp); 3514 ifma = if_findmulti(ifp, sa); 3515 if (ifma != NULL) { 3516 ifma->ifma_refcount++; 3517 if (retifma != NULL) 3518 *retifma = ifma; 3519 IF_ADDR_WUNLOCK(ifp); 3520 return (0); 3521 } 3522 3523 /* 3524 * The address isn't already present; resolve the protocol address 3525 * into a link layer address, and then look that up, bump its 3526 * refcount or allocate an ifma for that also. 3527 * Most link layer resolving functions returns address data which 3528 * fits inside default sockaddr_dl structure. However callback 3529 * can allocate another sockaddr structure, in that case we need to 3530 * free it later. 3531 */ 3532 llsa = NULL; 3533 ll_ifma = NULL; 3534 if (ifp->if_resolvemulti != NULL) { 3535 /* Provide called function with buffer size information */ 3536 sdl.sdl_len = sizeof(sdl); 3537 llsa = (struct sockaddr *)&sdl; 3538 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3539 if (error) 3540 goto unlock_out; 3541 } 3542 3543 /* 3544 * Allocate the new address. Don't hook it up yet, as we may also 3545 * need to allocate a link layer multicast address. 3546 */ 3547 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3548 if (ifma == NULL) { 3549 error = ENOMEM; 3550 goto free_llsa_out; 3551 } 3552 3553 /* 3554 * If a link layer address is found, we'll need to see if it's 3555 * already present in the address list, or allocate is as well. 3556 * When this block finishes, the link layer address will be on the 3557 * list. 3558 */ 3559 if (llsa != NULL) { 3560 ll_ifma = if_findmulti(ifp, llsa); 3561 if (ll_ifma == NULL) { 3562 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3563 if (ll_ifma == NULL) { 3564 --ifma->ifma_refcount; 3565 if_freemulti(ifma); 3566 error = ENOMEM; 3567 goto free_llsa_out; 3568 } 3569 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3570 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3571 ifma_link); 3572 } else 3573 ll_ifma->ifma_refcount++; 3574 ifma->ifma_llifma = ll_ifma; 3575 } 3576 3577 /* 3578 * We now have a new multicast address, ifma, and possibly a new or 3579 * referenced link layer address. Add the primary address to the 3580 * ifnet address list. 3581 */ 3582 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3583 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3584 3585 if (retifma != NULL) 3586 *retifma = ifma; 3587 3588 /* 3589 * Must generate the message while holding the lock so that 'ifma' 3590 * pointer is still valid. 3591 */ 3592 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3593 IF_ADDR_WUNLOCK(ifp); 3594 3595 /* 3596 * We are certain we have added something, so call down to the 3597 * interface to let them know about it. 3598 */ 3599 if (ifp->if_ioctl != NULL) { 3600 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3601 } 3602 3603 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3604 link_free_sdl(llsa); 3605 3606 return (0); 3607 3608 free_llsa_out: 3609 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3610 link_free_sdl(llsa); 3611 3612 unlock_out: 3613 IF_ADDR_WUNLOCK(ifp); 3614 return (error); 3615 } 3616 3617 /* 3618 * Delete a multicast group membership by network-layer group address. 3619 * 3620 * Returns ENOENT if the entry could not be found. If ifp no longer 3621 * exists, results are undefined. This entry point should only be used 3622 * from subsystems which do appropriate locking to hold ifp for the 3623 * duration of the call. 3624 * Network-layer protocol domains must use if_delmulti_ifma(). 3625 */ 3626 int 3627 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3628 { 3629 struct ifmultiaddr *ifma; 3630 int lastref; 3631 #ifdef INVARIANTS 3632 struct epoch_tracker et; 3633 struct ifnet *oifp; 3634 3635 NET_EPOCH_ENTER(et); 3636 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3637 if (ifp == oifp) 3638 break; 3639 if (ifp != oifp) 3640 ifp = NULL; 3641 NET_EPOCH_EXIT(et); 3642 3643 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3644 #endif 3645 if (ifp == NULL) 3646 return (ENOENT); 3647 3648 IF_ADDR_WLOCK(ifp); 3649 lastref = 0; 3650 ifma = if_findmulti(ifp, sa); 3651 if (ifma != NULL) 3652 lastref = if_delmulti_locked(ifp, ifma, 0); 3653 IF_ADDR_WUNLOCK(ifp); 3654 3655 if (ifma == NULL) 3656 return (ENOENT); 3657 3658 if (lastref && ifp->if_ioctl != NULL) { 3659 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3660 } 3661 3662 return (0); 3663 } 3664 3665 /* 3666 * Delete all multicast group membership for an interface. 3667 * Should be used to quickly flush all multicast filters. 3668 */ 3669 void 3670 if_delallmulti(struct ifnet *ifp) 3671 { 3672 struct ifmultiaddr *ifma; 3673 struct ifmultiaddr *next; 3674 3675 IF_ADDR_WLOCK(ifp); 3676 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3677 if_delmulti_locked(ifp, ifma, 0); 3678 IF_ADDR_WUNLOCK(ifp); 3679 } 3680 3681 void 3682 if_delmulti_ifma(struct ifmultiaddr *ifma) 3683 { 3684 if_delmulti_ifma_flags(ifma, 0); 3685 } 3686 3687 /* 3688 * Delete a multicast group membership by group membership pointer. 3689 * Network-layer protocol domains must use this routine. 3690 * 3691 * It is safe to call this routine if the ifp disappeared. 3692 */ 3693 void 3694 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3695 { 3696 struct ifnet *ifp; 3697 int lastref; 3698 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3699 #ifdef INET 3700 IN_MULTI_LIST_UNLOCK_ASSERT(); 3701 #endif 3702 ifp = ifma->ifma_ifp; 3703 #ifdef DIAGNOSTIC 3704 if (ifp == NULL) { 3705 printf("%s: ifma_ifp seems to be detached\n", __func__); 3706 } else { 3707 struct epoch_tracker et; 3708 struct ifnet *oifp; 3709 3710 NET_EPOCH_ENTER(et); 3711 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3712 if (ifp == oifp) 3713 break; 3714 if (ifp != oifp) 3715 ifp = NULL; 3716 NET_EPOCH_EXIT(et); 3717 } 3718 #endif 3719 /* 3720 * If and only if the ifnet instance exists: Acquire the address lock. 3721 */ 3722 if (ifp != NULL) 3723 IF_ADDR_WLOCK(ifp); 3724 3725 lastref = if_delmulti_locked(ifp, ifma, flags); 3726 3727 if (ifp != NULL) { 3728 /* 3729 * If and only if the ifnet instance exists: 3730 * Release the address lock. 3731 * If the group was left: update the hardware hash filter. 3732 */ 3733 IF_ADDR_WUNLOCK(ifp); 3734 if (lastref && ifp->if_ioctl != NULL) { 3735 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3736 } 3737 } 3738 } 3739 3740 /* 3741 * Perform deletion of network-layer and/or link-layer multicast address. 3742 * 3743 * Return 0 if the reference count was decremented. 3744 * Return 1 if the final reference was released, indicating that the 3745 * hardware hash filter should be reprogrammed. 3746 */ 3747 static int 3748 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3749 { 3750 struct ifmultiaddr *ll_ifma; 3751 3752 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3753 KASSERT(ifma->ifma_ifp == ifp, 3754 ("%s: inconsistent ifp %p", __func__, ifp)); 3755 IF_ADDR_WLOCK_ASSERT(ifp); 3756 } 3757 3758 ifp = ifma->ifma_ifp; 3759 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3760 3761 /* 3762 * If the ifnet is detaching, null out references to ifnet, 3763 * so that upper protocol layers will notice, and not attempt 3764 * to obtain locks for an ifnet which no longer exists. The 3765 * routing socket announcement must happen before the ifnet 3766 * instance is detached from the system. 3767 */ 3768 if (detaching) { 3769 #ifdef DIAGNOSTIC 3770 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3771 #endif 3772 /* 3773 * ifp may already be nulled out if we are being reentered 3774 * to delete the ll_ifma. 3775 */ 3776 if (ifp != NULL) { 3777 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3778 ifma->ifma_ifp = NULL; 3779 } 3780 } 3781 3782 if (--ifma->ifma_refcount > 0) 3783 return 0; 3784 3785 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3786 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3787 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3788 } 3789 /* 3790 * If this ifma is a network-layer ifma, a link-layer ifma may 3791 * have been associated with it. Release it first if so. 3792 */ 3793 ll_ifma = ifma->ifma_llifma; 3794 if (ll_ifma != NULL) { 3795 KASSERT(ifma->ifma_lladdr != NULL, 3796 ("%s: llifma w/o lladdr", __func__)); 3797 if (detaching) 3798 ll_ifma->ifma_ifp = NULL; /* XXX */ 3799 if (--ll_ifma->ifma_refcount == 0) { 3800 if (ifp != NULL) { 3801 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3802 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3803 ifma_link); 3804 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3805 } 3806 } 3807 if_freemulti(ll_ifma); 3808 } 3809 } 3810 #ifdef INVARIANTS 3811 if (ifp) { 3812 struct ifmultiaddr *ifmatmp; 3813 3814 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3815 MPASS(ifma != ifmatmp); 3816 } 3817 #endif 3818 if_freemulti(ifma); 3819 /* 3820 * The last reference to this instance of struct ifmultiaddr 3821 * was released; the hardware should be notified of this change. 3822 */ 3823 return 1; 3824 } 3825 3826 /* 3827 * Set the link layer address on an interface. 3828 * 3829 * At this time we only support certain types of interfaces, 3830 * and we don't allow the length of the address to change. 3831 * 3832 * Set noinline to be dtrace-friendly 3833 */ 3834 __noinline int 3835 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3836 { 3837 struct sockaddr_dl *sdl; 3838 struct ifaddr *ifa; 3839 struct ifreq ifr; 3840 struct epoch_tracker et; 3841 int rc; 3842 3843 rc = 0; 3844 NET_EPOCH_ENTER(et); 3845 ifa = ifp->if_addr; 3846 if (ifa == NULL) { 3847 rc = EINVAL; 3848 goto out; 3849 } 3850 3851 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3852 if (sdl == NULL) { 3853 rc = EINVAL; 3854 goto out; 3855 } 3856 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3857 rc = EINVAL; 3858 goto out; 3859 } 3860 switch (ifp->if_type) { 3861 case IFT_ETHER: 3862 case IFT_XETHER: 3863 case IFT_L2VLAN: 3864 case IFT_BRIDGE: 3865 case IFT_IEEE8023ADLAG: 3866 bcopy(lladdr, LLADDR(sdl), len); 3867 break; 3868 default: 3869 rc = ENODEV; 3870 goto out; 3871 } 3872 3873 /* 3874 * If the interface is already up, we need 3875 * to re-init it in order to reprogram its 3876 * address filter. 3877 */ 3878 NET_EPOCH_EXIT(et); 3879 if ((ifp->if_flags & IFF_UP) != 0) { 3880 if (ifp->if_ioctl) { 3881 ifp->if_flags &= ~IFF_UP; 3882 ifr.ifr_flags = ifp->if_flags & 0xffff; 3883 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3884 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3885 ifp->if_flags |= IFF_UP; 3886 ifr.ifr_flags = ifp->if_flags & 0xffff; 3887 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3888 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3889 } 3890 } 3891 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3892 return (0); 3893 out: 3894 NET_EPOCH_EXIT(et); 3895 return (rc); 3896 } 3897 3898 /* 3899 * Compat function for handling basic encapsulation requests. 3900 * Not converted stacks (FDDI, IB, ..) supports traditional 3901 * output model: ARP (and other similar L2 protocols) are handled 3902 * inside output routine, arpresolve/nd6_resolve() returns MAC 3903 * address instead of full prepend. 3904 * 3905 * This function creates calculated header==MAC for IPv4/IPv6 and 3906 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3907 * address families. 3908 */ 3909 static int 3910 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3911 { 3912 3913 if (req->rtype != IFENCAP_LL) 3914 return (EOPNOTSUPP); 3915 3916 if (req->bufsize < req->lladdr_len) 3917 return (ENOMEM); 3918 3919 switch (req->family) { 3920 case AF_INET: 3921 case AF_INET6: 3922 break; 3923 default: 3924 return (EAFNOSUPPORT); 3925 } 3926 3927 /* Copy lladdr to storage as is */ 3928 memmove(req->buf, req->lladdr, req->lladdr_len); 3929 req->bufsize = req->lladdr_len; 3930 req->lladdr_off = 0; 3931 3932 return (0); 3933 } 3934 3935 /* 3936 * Tunnel interfaces can nest, also they may cause infinite recursion 3937 * calls when misconfigured. We'll prevent this by detecting loops. 3938 * High nesting level may cause stack exhaustion. We'll prevent this 3939 * by introducing upper limit. 3940 * 3941 * Return 0, if tunnel nesting count is equal or less than limit. 3942 */ 3943 int 3944 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3945 int limit) 3946 { 3947 struct m_tag *mtag; 3948 int count; 3949 3950 count = 1; 3951 mtag = NULL; 3952 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3953 if (*(struct ifnet **)(mtag + 1) == ifp) { 3954 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3955 return (EIO); 3956 } 3957 count++; 3958 } 3959 if (count > limit) { 3960 log(LOG_NOTICE, 3961 "%s: if_output recursively called too many times(%d)\n", 3962 if_name(ifp), count); 3963 return (EIO); 3964 } 3965 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3966 if (mtag == NULL) 3967 return (ENOMEM); 3968 *(struct ifnet **)(mtag + 1) = ifp; 3969 m_tag_prepend(m, mtag); 3970 return (0); 3971 } 3972 3973 /* 3974 * Get the link layer address that was read from the hardware at attach. 3975 * 3976 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3977 * their component interfaces as IFT_IEEE8023ADLAG. 3978 */ 3979 int 3980 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3981 { 3982 3983 if (ifp->if_hw_addr == NULL) 3984 return (ENODEV); 3985 3986 switch (ifp->if_type) { 3987 case IFT_ETHER: 3988 case IFT_IEEE8023ADLAG: 3989 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3990 return (0); 3991 default: 3992 return (ENODEV); 3993 } 3994 } 3995 3996 /* 3997 * The name argument must be a pointer to storage which will last as 3998 * long as the interface does. For physical devices, the result of 3999 * device_get_name(dev) is a good choice and for pseudo-devices a 4000 * static string works well. 4001 */ 4002 void 4003 if_initname(struct ifnet *ifp, const char *name, int unit) 4004 { 4005 ifp->if_dname = name; 4006 ifp->if_dunit = unit; 4007 if (unit != IF_DUNIT_NONE) 4008 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 4009 else 4010 strlcpy(ifp->if_xname, name, IFNAMSIZ); 4011 } 4012 4013 int 4014 if_printf(struct ifnet *ifp, const char *fmt, ...) 4015 { 4016 char if_fmt[256]; 4017 va_list ap; 4018 4019 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 4020 va_start(ap, fmt); 4021 vlog(LOG_INFO, if_fmt, ap); 4022 va_end(ap); 4023 return (0); 4024 } 4025 4026 void 4027 if_start(struct ifnet *ifp) 4028 { 4029 4030 (*(ifp)->if_start)(ifp); 4031 } 4032 4033 /* 4034 * Backwards compatibility interface for drivers 4035 * that have not implemented it 4036 */ 4037 static int 4038 if_transmit(struct ifnet *ifp, struct mbuf *m) 4039 { 4040 int error; 4041 4042 IFQ_HANDOFF(ifp, m, error); 4043 return (error); 4044 } 4045 4046 static void 4047 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4048 { 4049 4050 m_freem(m); 4051 } 4052 4053 int 4054 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4055 { 4056 int active = 0; 4057 4058 IF_LOCK(ifq); 4059 if (_IF_QFULL(ifq)) { 4060 IF_UNLOCK(ifq); 4061 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4062 m_freem(m); 4063 return (0); 4064 } 4065 if (ifp != NULL) { 4066 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4067 if (m->m_flags & (M_BCAST|M_MCAST)) 4068 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4069 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4070 } 4071 _IF_ENQUEUE(ifq, m); 4072 IF_UNLOCK(ifq); 4073 if (ifp != NULL && !active) 4074 (*(ifp)->if_start)(ifp); 4075 return (1); 4076 } 4077 4078 void 4079 if_register_com_alloc(u_char type, 4080 if_com_alloc_t *a, if_com_free_t *f) 4081 { 4082 4083 KASSERT(if_com_alloc[type] == NULL, 4084 ("if_register_com_alloc: %d already registered", type)); 4085 KASSERT(if_com_free[type] == NULL, 4086 ("if_register_com_alloc: %d free already registered", type)); 4087 4088 if_com_alloc[type] = a; 4089 if_com_free[type] = f; 4090 } 4091 4092 void 4093 if_deregister_com_alloc(u_char type) 4094 { 4095 4096 KASSERT(if_com_alloc[type] != NULL, 4097 ("if_deregister_com_alloc: %d not registered", type)); 4098 KASSERT(if_com_free[type] != NULL, 4099 ("if_deregister_com_alloc: %d free not registered", type)); 4100 if_com_alloc[type] = NULL; 4101 if_com_free[type] = NULL; 4102 } 4103 4104 /* API for driver access to network stack owned ifnet.*/ 4105 uint64_t 4106 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4107 { 4108 uint64_t oldbrate; 4109 4110 oldbrate = ifp->if_baudrate; 4111 ifp->if_baudrate = baudrate; 4112 return (oldbrate); 4113 } 4114 4115 uint64_t 4116 if_getbaudrate(if_t ifp) 4117 { 4118 4119 return (((struct ifnet *)ifp)->if_baudrate); 4120 } 4121 4122 int 4123 if_setcapabilities(if_t ifp, int capabilities) 4124 { 4125 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4126 return (0); 4127 } 4128 4129 int 4130 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4131 { 4132 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4133 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4134 4135 return (0); 4136 } 4137 4138 int 4139 if_getcapabilities(if_t ifp) 4140 { 4141 return ((struct ifnet *)ifp)->if_capabilities; 4142 } 4143 4144 int 4145 if_setcapenable(if_t ifp, int capabilities) 4146 { 4147 ((struct ifnet *)ifp)->if_capenable = capabilities; 4148 return (0); 4149 } 4150 4151 int 4152 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4153 { 4154 if(setcap) 4155 ((struct ifnet *)ifp)->if_capenable |= setcap; 4156 if(clearcap) 4157 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4158 4159 return (0); 4160 } 4161 4162 const char * 4163 if_getdname(if_t ifp) 4164 { 4165 return ((struct ifnet *)ifp)->if_dname; 4166 } 4167 4168 int 4169 if_togglecapenable(if_t ifp, int togglecap) 4170 { 4171 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4172 return (0); 4173 } 4174 4175 int 4176 if_getcapenable(if_t ifp) 4177 { 4178 return ((struct ifnet *)ifp)->if_capenable; 4179 } 4180 4181 /* 4182 * This is largely undesirable because it ties ifnet to a device, but does 4183 * provide flexiblity for an embedded product vendor. Should be used with 4184 * the understanding that it violates the interface boundaries, and should be 4185 * a last resort only. 4186 */ 4187 int 4188 if_setdev(if_t ifp, void *dev) 4189 { 4190 return (0); 4191 } 4192 4193 int 4194 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4195 { 4196 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4197 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4198 4199 return (0); 4200 } 4201 4202 int 4203 if_getdrvflags(if_t ifp) 4204 { 4205 return ((struct ifnet *)ifp)->if_drv_flags; 4206 } 4207 4208 int 4209 if_setdrvflags(if_t ifp, int flags) 4210 { 4211 ((struct ifnet *)ifp)->if_drv_flags = flags; 4212 return (0); 4213 } 4214 4215 4216 int 4217 if_setflags(if_t ifp, int flags) 4218 { 4219 ((struct ifnet *)ifp)->if_flags = flags; 4220 return (0); 4221 } 4222 4223 int 4224 if_setflagbits(if_t ifp, int set, int clear) 4225 { 4226 ((struct ifnet *)ifp)->if_flags |= set; 4227 ((struct ifnet *)ifp)->if_flags &= ~clear; 4228 4229 return (0); 4230 } 4231 4232 int 4233 if_getflags(if_t ifp) 4234 { 4235 return ((struct ifnet *)ifp)->if_flags; 4236 } 4237 4238 int 4239 if_clearhwassist(if_t ifp) 4240 { 4241 ((struct ifnet *)ifp)->if_hwassist = 0; 4242 return (0); 4243 } 4244 4245 int 4246 if_sethwassistbits(if_t ifp, int toset, int toclear) 4247 { 4248 ((struct ifnet *)ifp)->if_hwassist |= toset; 4249 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4250 4251 return (0); 4252 } 4253 4254 int 4255 if_sethwassist(if_t ifp, int hwassist_bit) 4256 { 4257 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4258 return (0); 4259 } 4260 4261 int 4262 if_gethwassist(if_t ifp) 4263 { 4264 return ((struct ifnet *)ifp)->if_hwassist; 4265 } 4266 4267 int 4268 if_setmtu(if_t ifp, int mtu) 4269 { 4270 ((struct ifnet *)ifp)->if_mtu = mtu; 4271 return (0); 4272 } 4273 4274 int 4275 if_getmtu(if_t ifp) 4276 { 4277 return ((struct ifnet *)ifp)->if_mtu; 4278 } 4279 4280 int 4281 if_getmtu_family(if_t ifp, int family) 4282 { 4283 struct domain *dp; 4284 4285 for (dp = domains; dp; dp = dp->dom_next) { 4286 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4287 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4288 } 4289 4290 return (((struct ifnet *)ifp)->if_mtu); 4291 } 4292 4293 int 4294 if_setsoftc(if_t ifp, void *softc) 4295 { 4296 ((struct ifnet *)ifp)->if_softc = softc; 4297 return (0); 4298 } 4299 4300 void * 4301 if_getsoftc(if_t ifp) 4302 { 4303 return ((struct ifnet *)ifp)->if_softc; 4304 } 4305 4306 void 4307 if_setrcvif(struct mbuf *m, if_t ifp) 4308 { 4309 4310 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4311 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4312 } 4313 4314 void 4315 if_setvtag(struct mbuf *m, uint16_t tag) 4316 { 4317 m->m_pkthdr.ether_vtag = tag; 4318 } 4319 4320 uint16_t 4321 if_getvtag(struct mbuf *m) 4322 { 4323 4324 return (m->m_pkthdr.ether_vtag); 4325 } 4326 4327 int 4328 if_sendq_empty(if_t ifp) 4329 { 4330 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4331 } 4332 4333 struct ifaddr * 4334 if_getifaddr(if_t ifp) 4335 { 4336 return ((struct ifnet *)ifp)->if_addr; 4337 } 4338 4339 int 4340 if_getamcount(if_t ifp) 4341 { 4342 return ((struct ifnet *)ifp)->if_amcount; 4343 } 4344 4345 4346 int 4347 if_setsendqready(if_t ifp) 4348 { 4349 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4350 return (0); 4351 } 4352 4353 int 4354 if_setsendqlen(if_t ifp, int tx_desc_count) 4355 { 4356 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4357 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4358 4359 return (0); 4360 } 4361 4362 int 4363 if_vlantrunkinuse(if_t ifp) 4364 { 4365 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4366 } 4367 4368 int 4369 if_input(if_t ifp, struct mbuf* sendmp) 4370 { 4371 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4372 return (0); 4373 4374 } 4375 4376 /* XXX */ 4377 #ifndef ETH_ADDR_LEN 4378 #define ETH_ADDR_LEN 6 4379 #endif 4380 4381 int 4382 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4383 { 4384 struct ifmultiaddr *ifma; 4385 uint8_t *lmta = (uint8_t *)mta; 4386 int mcnt = 0; 4387 4388 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4389 if (ifma->ifma_addr->sa_family != AF_LINK) 4390 continue; 4391 4392 if (mcnt == max) 4393 break; 4394 4395 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4396 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4397 mcnt++; 4398 } 4399 *cnt = mcnt; 4400 4401 return (0); 4402 } 4403 4404 int 4405 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4406 { 4407 int error; 4408 4409 if_maddr_rlock(ifp); 4410 error = if_setupmultiaddr(ifp, mta, cnt, max); 4411 if_maddr_runlock(ifp); 4412 return (error); 4413 } 4414 4415 int 4416 if_multiaddr_count(if_t ifp, int max) 4417 { 4418 struct ifmultiaddr *ifma; 4419 int count; 4420 4421 count = 0; 4422 if_maddr_rlock(ifp); 4423 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4424 if (ifma->ifma_addr->sa_family != AF_LINK) 4425 continue; 4426 count++; 4427 if (count == max) 4428 break; 4429 } 4430 if_maddr_runlock(ifp); 4431 return (count); 4432 } 4433 4434 int 4435 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4436 { 4437 struct ifmultiaddr *ifma; 4438 int cnt = 0; 4439 4440 if_maddr_rlock(ifp); 4441 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4442 cnt += filter(arg, ifma, cnt); 4443 if_maddr_runlock(ifp); 4444 return (cnt); 4445 } 4446 4447 struct mbuf * 4448 if_dequeue(if_t ifp) 4449 { 4450 struct mbuf *m; 4451 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4452 4453 return (m); 4454 } 4455 4456 int 4457 if_sendq_prepend(if_t ifp, struct mbuf *m) 4458 { 4459 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4460 return (0); 4461 } 4462 4463 int 4464 if_setifheaderlen(if_t ifp, int len) 4465 { 4466 ((struct ifnet *)ifp)->if_hdrlen = len; 4467 return (0); 4468 } 4469 4470 caddr_t 4471 if_getlladdr(if_t ifp) 4472 { 4473 return (IF_LLADDR((struct ifnet *)ifp)); 4474 } 4475 4476 void * 4477 if_gethandle(u_char type) 4478 { 4479 return (if_alloc(type)); 4480 } 4481 4482 void 4483 if_bpfmtap(if_t ifh, struct mbuf *m) 4484 { 4485 struct ifnet *ifp = (struct ifnet *)ifh; 4486 4487 BPF_MTAP(ifp, m); 4488 } 4489 4490 void 4491 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4492 { 4493 struct ifnet *ifp = (struct ifnet *)ifh; 4494 4495 ETHER_BPF_MTAP(ifp, m); 4496 } 4497 4498 void 4499 if_vlancap(if_t ifh) 4500 { 4501 struct ifnet *ifp = (struct ifnet *)ifh; 4502 VLAN_CAPABILITIES(ifp); 4503 } 4504 4505 int 4506 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4507 { 4508 4509 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4510 return (0); 4511 } 4512 4513 int 4514 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4515 { 4516 4517 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4518 return (0); 4519 } 4520 4521 int 4522 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4523 { 4524 4525 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4526 return (0); 4527 } 4528 4529 u_int 4530 if_gethwtsomax(if_t ifp) 4531 { 4532 4533 return (((struct ifnet *)ifp)->if_hw_tsomax); 4534 } 4535 4536 u_int 4537 if_gethwtsomaxsegcount(if_t ifp) 4538 { 4539 4540 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4541 } 4542 4543 u_int 4544 if_gethwtsomaxsegsize(if_t ifp) 4545 { 4546 4547 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4548 } 4549 4550 void 4551 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4552 { 4553 ((struct ifnet *)ifp)->if_init = init_fn; 4554 } 4555 4556 void 4557 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4558 { 4559 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4560 } 4561 4562 void 4563 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4564 { 4565 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4566 } 4567 4568 void 4569 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4570 { 4571 ((struct ifnet *)ifp)->if_transmit = start_fn; 4572 } 4573 4574 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4575 { 4576 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4577 4578 } 4579 4580 void 4581 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4582 { 4583 4584 ifp->if_get_counter = fn; 4585 } 4586 4587 /* Revisit these - These are inline functions originally. */ 4588 int 4589 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4590 { 4591 return drbr_inuse(ifh, br); 4592 } 4593 4594 struct mbuf* 4595 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4596 { 4597 return drbr_dequeue(ifh, br); 4598 } 4599 4600 int 4601 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4602 { 4603 return drbr_needs_enqueue(ifh, br); 4604 } 4605 4606 int 4607 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4608 { 4609 return drbr_enqueue(ifh, br, m); 4610 4611 } 4612