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 (ifunit(new_name) != NULL) 2720 return (EEXIST); 2721 2722 /* 2723 * XXX: Locking. Nothing else seems to lock if_flags, 2724 * and there are numerous other races with the 2725 * ifunit() checks not being atomic with namespace 2726 * changes (renames, vmoves, if_attach, etc). 2727 */ 2728 ifp->if_flags |= IFF_RENAMING; 2729 2730 /* Announce the departure of the interface. */ 2731 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2732 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2733 2734 if_printf(ifp, "changing name to '%s'\n", new_name); 2735 2736 IF_ADDR_WLOCK(ifp); 2737 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2738 ifa = ifp->if_addr; 2739 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2740 namelen = strlen(new_name); 2741 onamelen = sdl->sdl_nlen; 2742 /* 2743 * Move the address if needed. This is safe because we 2744 * allocate space for a name of length IFNAMSIZ when we 2745 * create this in if_attach(). 2746 */ 2747 if (namelen != onamelen) { 2748 bcopy(sdl->sdl_data + onamelen, 2749 sdl->sdl_data + namelen, sdl->sdl_alen); 2750 } 2751 bcopy(new_name, sdl->sdl_data, namelen); 2752 sdl->sdl_nlen = namelen; 2753 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2754 bzero(sdl->sdl_data, onamelen); 2755 while (namelen != 0) 2756 sdl->sdl_data[--namelen] = 0xff; 2757 IF_ADDR_WUNLOCK(ifp); 2758 2759 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2760 /* Announce the return of the interface. */ 2761 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2762 2763 ifp->if_flags &= ~IFF_RENAMING; 2764 break; 2765 2766 #ifdef VIMAGE 2767 case SIOCSIFVNET: 2768 error = priv_check(td, PRIV_NET_SETIFVNET); 2769 if (error) 2770 return (error); 2771 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2772 break; 2773 #endif 2774 2775 case SIOCSIFMETRIC: 2776 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2777 if (error) 2778 return (error); 2779 ifp->if_metric = ifr->ifr_metric; 2780 getmicrotime(&ifp->if_lastchange); 2781 break; 2782 2783 case SIOCSIFPHYS: 2784 error = priv_check(td, PRIV_NET_SETIFPHYS); 2785 if (error) 2786 return (error); 2787 if (ifp->if_ioctl == NULL) 2788 return (EOPNOTSUPP); 2789 error = (*ifp->if_ioctl)(ifp, cmd, data); 2790 if (error == 0) 2791 getmicrotime(&ifp->if_lastchange); 2792 break; 2793 2794 case SIOCSIFMTU: 2795 { 2796 u_long oldmtu = ifp->if_mtu; 2797 2798 error = priv_check(td, PRIV_NET_SETIFMTU); 2799 if (error) 2800 return (error); 2801 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2802 return (EINVAL); 2803 if (ifp->if_ioctl == NULL) 2804 return (EOPNOTSUPP); 2805 error = (*ifp->if_ioctl)(ifp, cmd, data); 2806 if (error == 0) { 2807 getmicrotime(&ifp->if_lastchange); 2808 rt_ifmsg(ifp); 2809 #ifdef INET 2810 NETDUMP_REINIT(ifp); 2811 #endif 2812 } 2813 /* 2814 * If the link MTU changed, do network layer specific procedure. 2815 */ 2816 if (ifp->if_mtu != oldmtu) { 2817 #ifdef INET6 2818 nd6_setmtu(ifp); 2819 #endif 2820 rt_updatemtu(ifp); 2821 } 2822 break; 2823 } 2824 2825 case SIOCADDMULTI: 2826 case SIOCDELMULTI: 2827 if (cmd == SIOCADDMULTI) 2828 error = priv_check(td, PRIV_NET_ADDMULTI); 2829 else 2830 error = priv_check(td, PRIV_NET_DELMULTI); 2831 if (error) 2832 return (error); 2833 2834 /* Don't allow group membership on non-multicast interfaces. */ 2835 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2836 return (EOPNOTSUPP); 2837 2838 /* Don't let users screw up protocols' entries. */ 2839 if (ifr->ifr_addr.sa_family != AF_LINK) 2840 return (EINVAL); 2841 2842 if (cmd == SIOCADDMULTI) { 2843 struct epoch_tracker et; 2844 struct ifmultiaddr *ifma; 2845 2846 /* 2847 * Userland is only permitted to join groups once 2848 * via the if_addmulti() KPI, because it cannot hold 2849 * struct ifmultiaddr * between calls. It may also 2850 * lose a race while we check if the membership 2851 * already exists. 2852 */ 2853 NET_EPOCH_ENTER(et); 2854 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2855 NET_EPOCH_EXIT(et); 2856 if (ifma != NULL) 2857 error = EADDRINUSE; 2858 else 2859 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2860 } else { 2861 error = if_delmulti(ifp, &ifr->ifr_addr); 2862 } 2863 if (error == 0) 2864 getmicrotime(&ifp->if_lastchange); 2865 break; 2866 2867 case SIOCSIFPHYADDR: 2868 case SIOCDIFPHYADDR: 2869 #ifdef INET6 2870 case SIOCSIFPHYADDR_IN6: 2871 #endif 2872 case SIOCSIFMEDIA: 2873 case SIOCSIFGENERIC: 2874 error = priv_check(td, PRIV_NET_HWIOCTL); 2875 if (error) 2876 return (error); 2877 if (ifp->if_ioctl == NULL) 2878 return (EOPNOTSUPP); 2879 error = (*ifp->if_ioctl)(ifp, cmd, data); 2880 if (error == 0) 2881 getmicrotime(&ifp->if_lastchange); 2882 break; 2883 2884 case SIOCGIFSTATUS: 2885 case SIOCGIFPSRCADDR: 2886 case SIOCGIFPDSTADDR: 2887 case SIOCGIFMEDIA: 2888 case SIOCGIFXMEDIA: 2889 case SIOCGIFGENERIC: 2890 case SIOCGIFRSSKEY: 2891 case SIOCGIFRSSHASH: 2892 if (ifp->if_ioctl == NULL) 2893 return (EOPNOTSUPP); 2894 error = (*ifp->if_ioctl)(ifp, cmd, data); 2895 break; 2896 2897 case SIOCSIFLLADDR: 2898 error = priv_check(td, PRIV_NET_SETLLADDR); 2899 if (error) 2900 return (error); 2901 error = if_setlladdr(ifp, 2902 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2903 break; 2904 2905 case SIOCGHWADDR: 2906 error = if_gethwaddr(ifp, ifr); 2907 break; 2908 2909 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2910 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2911 if (error) 2912 return (error); 2913 if ((error = if_addgroup(ifp, 2914 ifgr_group_get((struct ifgroupreq *)data)))) 2915 return (error); 2916 break; 2917 2918 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2919 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2920 return (error); 2921 break; 2922 2923 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2924 error = priv_check(td, PRIV_NET_DELIFGROUP); 2925 if (error) 2926 return (error); 2927 if ((error = if_delgroup(ifp, 2928 ifgr_group_get((struct ifgroupreq *)data)))) 2929 return (error); 2930 break; 2931 2932 default: 2933 error = ENOIOCTL; 2934 break; 2935 } 2936 return (error); 2937 } 2938 2939 #ifdef COMPAT_FREEBSD32 2940 struct ifconf32 { 2941 int32_t ifc_len; 2942 union { 2943 uint32_t ifcu_buf; 2944 uint32_t ifcu_req; 2945 } ifc_ifcu; 2946 }; 2947 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2948 #endif 2949 2950 #ifdef COMPAT_FREEBSD32 2951 static void 2952 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2953 { 2954 struct ifmediareq32 *ifmr32; 2955 2956 ifmr32 = (struct ifmediareq32 *)data; 2957 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2958 sizeof(ifmr->ifm_name)); 2959 ifmr->ifm_current = ifmr32->ifm_current; 2960 ifmr->ifm_mask = ifmr32->ifm_mask; 2961 ifmr->ifm_status = ifmr32->ifm_status; 2962 ifmr->ifm_active = ifmr32->ifm_active; 2963 ifmr->ifm_count = ifmr32->ifm_count; 2964 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2965 } 2966 2967 static void 2968 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2969 { 2970 struct ifmediareq32 *ifmr32; 2971 2972 ifmr32 = (struct ifmediareq32 *)data; 2973 ifmr32->ifm_current = ifmr->ifm_current; 2974 ifmr32->ifm_mask = ifmr->ifm_mask; 2975 ifmr32->ifm_status = ifmr->ifm_status; 2976 ifmr32->ifm_active = ifmr->ifm_active; 2977 ifmr32->ifm_count = ifmr->ifm_count; 2978 } 2979 #endif 2980 2981 /* 2982 * Interface ioctls. 2983 */ 2984 int 2985 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2986 { 2987 #ifdef COMPAT_FREEBSD32 2988 caddr_t saved_data = NULL; 2989 struct ifmediareq ifmr; 2990 struct ifmediareq *ifmrp; 2991 #endif 2992 struct ifnet *ifp; 2993 struct ifreq *ifr; 2994 int error; 2995 int oif_flags; 2996 #ifdef VIMAGE 2997 int shutdown; 2998 #endif 2999 3000 CURVNET_SET(so->so_vnet); 3001 #ifdef VIMAGE 3002 /* Make sure the VNET is stable. */ 3003 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 3004 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 3005 if (shutdown) { 3006 CURVNET_RESTORE(); 3007 return (EBUSY); 3008 } 3009 #endif 3010 3011 3012 switch (cmd) { 3013 case SIOCGIFCONF: 3014 error = ifconf(cmd, data); 3015 CURVNET_RESTORE(); 3016 return (error); 3017 3018 #ifdef COMPAT_FREEBSD32 3019 case SIOCGIFCONF32: 3020 { 3021 struct ifconf32 *ifc32; 3022 struct ifconf ifc; 3023 3024 ifc32 = (struct ifconf32 *)data; 3025 ifc.ifc_len = ifc32->ifc_len; 3026 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3027 3028 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3029 CURVNET_RESTORE(); 3030 if (error == 0) 3031 ifc32->ifc_len = ifc.ifc_len; 3032 return (error); 3033 } 3034 #endif 3035 } 3036 3037 #ifdef COMPAT_FREEBSD32 3038 ifmrp = NULL; 3039 switch (cmd) { 3040 case SIOCGIFMEDIA32: 3041 case SIOCGIFXMEDIA32: 3042 ifmrp = &ifmr; 3043 ifmr_init(ifmrp, data); 3044 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3045 saved_data = data; 3046 data = (caddr_t)ifmrp; 3047 } 3048 #endif 3049 3050 ifr = (struct ifreq *)data; 3051 switch (cmd) { 3052 #ifdef VIMAGE 3053 case SIOCSIFRVNET: 3054 error = priv_check(td, PRIV_NET_SETIFVNET); 3055 if (error == 0) 3056 error = if_vmove_reclaim(td, ifr->ifr_name, 3057 ifr->ifr_jid); 3058 goto out_noref; 3059 #endif 3060 case SIOCIFCREATE: 3061 case SIOCIFCREATE2: 3062 error = priv_check(td, PRIV_NET_IFCREATE); 3063 if (error == 0) 3064 error = if_clone_create(ifr->ifr_name, 3065 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3066 ifr_data_get_ptr(ifr) : NULL); 3067 goto out_noref; 3068 case SIOCIFDESTROY: 3069 error = priv_check(td, PRIV_NET_IFDESTROY); 3070 if (error == 0) 3071 error = if_clone_destroy(ifr->ifr_name); 3072 goto out_noref; 3073 3074 case SIOCIFGCLONERS: 3075 error = if_clone_list((struct if_clonereq *)data); 3076 goto out_noref; 3077 3078 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3079 error = if_getgroupmembers((struct ifgroupreq *)data); 3080 goto out_noref; 3081 3082 #if defined(INET) || defined(INET6) 3083 case SIOCSVH: 3084 case SIOCGVH: 3085 if (carp_ioctl_p == NULL) 3086 error = EPROTONOSUPPORT; 3087 else 3088 error = (*carp_ioctl_p)(ifr, cmd, td); 3089 goto out_noref; 3090 #endif 3091 } 3092 3093 ifp = ifunit_ref(ifr->ifr_name); 3094 if (ifp == NULL) { 3095 error = ENXIO; 3096 goto out_noref; 3097 } 3098 3099 error = ifhwioctl(cmd, ifp, data, td); 3100 if (error != ENOIOCTL) 3101 goto out_ref; 3102 3103 oif_flags = ifp->if_flags; 3104 if (so->so_proto == NULL) { 3105 error = EOPNOTSUPP; 3106 goto out_ref; 3107 } 3108 3109 /* 3110 * Pass the request on to the socket control method, and if the 3111 * latter returns EOPNOTSUPP, directly to the interface. 3112 * 3113 * Make an exception for the legacy SIOCSIF* requests. Drivers 3114 * trust SIOCSIFADDR et al to come from an already privileged 3115 * layer, and do not perform any credentials checks or input 3116 * validation. 3117 */ 3118 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3119 ifp, td)); 3120 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3121 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3122 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3123 error = (*ifp->if_ioctl)(ifp, cmd, data); 3124 3125 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3126 #ifdef INET6 3127 if (ifp->if_flags & IFF_UP) 3128 in6_if_up(ifp); 3129 #endif 3130 } 3131 3132 out_ref: 3133 if_rele(ifp); 3134 out_noref: 3135 #ifdef COMPAT_FREEBSD32 3136 if (ifmrp != NULL) { 3137 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3138 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3139 cmd)); 3140 data = saved_data; 3141 ifmr_update(ifmrp, data); 3142 } 3143 #endif 3144 CURVNET_RESTORE(); 3145 return (error); 3146 } 3147 3148 /* 3149 * The code common to handling reference counted flags, 3150 * e.g., in ifpromisc() and if_allmulti(). 3151 * The "pflag" argument can specify a permanent mode flag to check, 3152 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3153 * 3154 * Only to be used on stack-owned flags, not driver-owned flags. 3155 */ 3156 static int 3157 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3158 { 3159 struct ifreq ifr; 3160 int error; 3161 int oldflags, oldcount; 3162 3163 /* Sanity checks to catch programming errors */ 3164 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3165 ("%s: setting driver-owned flag %d", __func__, flag)); 3166 3167 if (onswitch) 3168 KASSERT(*refcount >= 0, 3169 ("%s: increment negative refcount %d for flag %d", 3170 __func__, *refcount, flag)); 3171 else 3172 KASSERT(*refcount > 0, 3173 ("%s: decrement non-positive refcount %d for flag %d", 3174 __func__, *refcount, flag)); 3175 3176 /* In case this mode is permanent, just touch refcount */ 3177 if (ifp->if_flags & pflag) { 3178 *refcount += onswitch ? 1 : -1; 3179 return (0); 3180 } 3181 3182 /* Save ifnet parameters for if_ioctl() may fail */ 3183 oldcount = *refcount; 3184 oldflags = ifp->if_flags; 3185 3186 /* 3187 * See if we aren't the only and touching refcount is enough. 3188 * Actually toggle interface flag if we are the first or last. 3189 */ 3190 if (onswitch) { 3191 if ((*refcount)++) 3192 return (0); 3193 ifp->if_flags |= flag; 3194 } else { 3195 if (--(*refcount)) 3196 return (0); 3197 ifp->if_flags &= ~flag; 3198 } 3199 3200 /* Call down the driver since we've changed interface flags */ 3201 if (ifp->if_ioctl == NULL) { 3202 error = EOPNOTSUPP; 3203 goto recover; 3204 } 3205 ifr.ifr_flags = ifp->if_flags & 0xffff; 3206 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3207 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3208 if (error) 3209 goto recover; 3210 /* Notify userland that interface flags have changed */ 3211 rt_ifmsg(ifp); 3212 return (0); 3213 3214 recover: 3215 /* Recover after driver error */ 3216 *refcount = oldcount; 3217 ifp->if_flags = oldflags; 3218 return (error); 3219 } 3220 3221 /* 3222 * Set/clear promiscuous mode on interface ifp based on the truth value 3223 * of pswitch. The calls are reference counted so that only the first 3224 * "on" request actually has an effect, as does the final "off" request. 3225 * Results are undefined if the "off" and "on" requests are not matched. 3226 */ 3227 int 3228 ifpromisc(struct ifnet *ifp, int pswitch) 3229 { 3230 int error; 3231 int oldflags = ifp->if_flags; 3232 3233 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3234 &ifp->if_pcount, pswitch); 3235 /* If promiscuous mode status has changed, log a message */ 3236 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3237 log_promisc_mode_change) 3238 if_printf(ifp, "promiscuous mode %s\n", 3239 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3240 return (error); 3241 } 3242 3243 /* 3244 * Return interface configuration 3245 * of system. List may be used 3246 * in later ioctl's (above) to get 3247 * other information. 3248 */ 3249 /*ARGSUSED*/ 3250 static int 3251 ifconf(u_long cmd, caddr_t data) 3252 { 3253 struct ifconf *ifc = (struct ifconf *)data; 3254 struct ifnet *ifp; 3255 struct ifaddr *ifa; 3256 struct ifreq ifr; 3257 struct sbuf *sb; 3258 int error, full = 0, valid_len, max_len; 3259 3260 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3261 max_len = MAXPHYS - 1; 3262 3263 /* Prevent hostile input from being able to crash the system */ 3264 if (ifc->ifc_len <= 0) 3265 return (EINVAL); 3266 3267 again: 3268 if (ifc->ifc_len <= max_len) { 3269 max_len = ifc->ifc_len; 3270 full = 1; 3271 } 3272 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3273 max_len = 0; 3274 valid_len = 0; 3275 3276 IFNET_RLOCK(); 3277 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3278 struct epoch_tracker et; 3279 int addrs; 3280 3281 /* 3282 * Zero the ifr to make sure we don't disclose the contents 3283 * of the stack. 3284 */ 3285 memset(&ifr, 0, sizeof(ifr)); 3286 3287 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3288 >= sizeof(ifr.ifr_name)) { 3289 sbuf_delete(sb); 3290 IFNET_RUNLOCK(); 3291 return (ENAMETOOLONG); 3292 } 3293 3294 addrs = 0; 3295 NET_EPOCH_ENTER(et); 3296 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3297 struct sockaddr *sa = ifa->ifa_addr; 3298 3299 if (prison_if(curthread->td_ucred, sa) != 0) 3300 continue; 3301 addrs++; 3302 if (sa->sa_len <= sizeof(*sa)) { 3303 if (sa->sa_len < sizeof(*sa)) { 3304 memset(&ifr.ifr_ifru.ifru_addr, 0, 3305 sizeof(ifr.ifr_ifru.ifru_addr)); 3306 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3307 sa->sa_len); 3308 } else 3309 ifr.ifr_ifru.ifru_addr = *sa; 3310 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3311 max_len += sizeof(ifr); 3312 } else { 3313 sbuf_bcat(sb, &ifr, 3314 offsetof(struct ifreq, ifr_addr)); 3315 max_len += offsetof(struct ifreq, ifr_addr); 3316 sbuf_bcat(sb, sa, sa->sa_len); 3317 max_len += sa->sa_len; 3318 } 3319 3320 if (sbuf_error(sb) == 0) 3321 valid_len = sbuf_len(sb); 3322 } 3323 NET_EPOCH_EXIT(et); 3324 if (addrs == 0) { 3325 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3326 max_len += sizeof(ifr); 3327 3328 if (sbuf_error(sb) == 0) 3329 valid_len = sbuf_len(sb); 3330 } 3331 } 3332 IFNET_RUNLOCK(); 3333 3334 /* 3335 * If we didn't allocate enough space (uncommon), try again. If 3336 * we have already allocated as much space as we are allowed, 3337 * return what we've got. 3338 */ 3339 if (valid_len != max_len && !full) { 3340 sbuf_delete(sb); 3341 goto again; 3342 } 3343 3344 ifc->ifc_len = valid_len; 3345 sbuf_finish(sb); 3346 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3347 sbuf_delete(sb); 3348 return (error); 3349 } 3350 3351 /* 3352 * Just like ifpromisc(), but for all-multicast-reception mode. 3353 */ 3354 int 3355 if_allmulti(struct ifnet *ifp, int onswitch) 3356 { 3357 3358 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3359 } 3360 3361 struct ifmultiaddr * 3362 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3363 { 3364 struct ifmultiaddr *ifma; 3365 3366 IF_ADDR_LOCK_ASSERT(ifp); 3367 3368 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3369 if (sa->sa_family == AF_LINK) { 3370 if (sa_dl_equal(ifma->ifma_addr, sa)) 3371 break; 3372 } else { 3373 if (sa_equal(ifma->ifma_addr, sa)) 3374 break; 3375 } 3376 } 3377 3378 return ifma; 3379 } 3380 3381 /* 3382 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3383 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3384 * the ifnet multicast address list here, so the caller must do that and 3385 * other setup work (such as notifying the device driver). The reference 3386 * count is initialized to 1. 3387 */ 3388 static struct ifmultiaddr * 3389 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3390 int mflags) 3391 { 3392 struct ifmultiaddr *ifma; 3393 struct sockaddr *dupsa; 3394 3395 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3396 M_ZERO); 3397 if (ifma == NULL) 3398 return (NULL); 3399 3400 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3401 if (dupsa == NULL) { 3402 free(ifma, M_IFMADDR); 3403 return (NULL); 3404 } 3405 bcopy(sa, dupsa, sa->sa_len); 3406 ifma->ifma_addr = dupsa; 3407 3408 ifma->ifma_ifp = ifp; 3409 ifma->ifma_refcount = 1; 3410 ifma->ifma_protospec = NULL; 3411 3412 if (llsa == NULL) { 3413 ifma->ifma_lladdr = NULL; 3414 return (ifma); 3415 } 3416 3417 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3418 if (dupsa == NULL) { 3419 free(ifma->ifma_addr, M_IFMADDR); 3420 free(ifma, M_IFMADDR); 3421 return (NULL); 3422 } 3423 bcopy(llsa, dupsa, llsa->sa_len); 3424 ifma->ifma_lladdr = dupsa; 3425 3426 return (ifma); 3427 } 3428 3429 /* 3430 * if_freemulti: free ifmultiaddr structure and possibly attached related 3431 * addresses. The caller is responsible for implementing reference 3432 * counting, notifying the driver, handling routing messages, and releasing 3433 * any dependent link layer state. 3434 */ 3435 #ifdef MCAST_VERBOSE 3436 extern void kdb_backtrace(void); 3437 #endif 3438 static void 3439 if_freemulti_internal(struct ifmultiaddr *ifma) 3440 { 3441 3442 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3443 ifma->ifma_refcount)); 3444 3445 if (ifma->ifma_lladdr != NULL) 3446 free(ifma->ifma_lladdr, M_IFMADDR); 3447 #ifdef MCAST_VERBOSE 3448 kdb_backtrace(); 3449 printf("%s freeing ifma: %p\n", __func__, ifma); 3450 #endif 3451 free(ifma->ifma_addr, M_IFMADDR); 3452 free(ifma, M_IFMADDR); 3453 } 3454 3455 static void 3456 if_destroymulti(epoch_context_t ctx) 3457 { 3458 struct ifmultiaddr *ifma; 3459 3460 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3461 if_freemulti_internal(ifma); 3462 } 3463 3464 void 3465 if_freemulti(struct ifmultiaddr *ifma) 3466 { 3467 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3468 ifma->ifma_refcount)); 3469 3470 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3471 } 3472 3473 3474 /* 3475 * Register an additional multicast address with a network interface. 3476 * 3477 * - If the address is already present, bump the reference count on the 3478 * address and return. 3479 * - If the address is not link-layer, look up a link layer address. 3480 * - Allocate address structures for one or both addresses, and attach to the 3481 * multicast address list on the interface. If automatically adding a link 3482 * layer address, the protocol address will own a reference to the link 3483 * layer address, to be freed when it is freed. 3484 * - Notify the network device driver of an addition to the multicast address 3485 * list. 3486 * 3487 * 'sa' points to caller-owned memory with the desired multicast address. 3488 * 3489 * 'retifma' will be used to return a pointer to the resulting multicast 3490 * address reference, if desired. 3491 */ 3492 int 3493 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3494 struct ifmultiaddr **retifma) 3495 { 3496 struct ifmultiaddr *ifma, *ll_ifma; 3497 struct sockaddr *llsa; 3498 struct sockaddr_dl sdl; 3499 int error; 3500 3501 #ifdef INET 3502 IN_MULTI_LIST_UNLOCK_ASSERT(); 3503 #endif 3504 #ifdef INET6 3505 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3506 #endif 3507 /* 3508 * If the address is already present, return a new reference to it; 3509 * otherwise, allocate storage and set up a new address. 3510 */ 3511 IF_ADDR_WLOCK(ifp); 3512 ifma = if_findmulti(ifp, sa); 3513 if (ifma != NULL) { 3514 ifma->ifma_refcount++; 3515 if (retifma != NULL) 3516 *retifma = ifma; 3517 IF_ADDR_WUNLOCK(ifp); 3518 return (0); 3519 } 3520 3521 /* 3522 * The address isn't already present; resolve the protocol address 3523 * into a link layer address, and then look that up, bump its 3524 * refcount or allocate an ifma for that also. 3525 * Most link layer resolving functions returns address data which 3526 * fits inside default sockaddr_dl structure. However callback 3527 * can allocate another sockaddr structure, in that case we need to 3528 * free it later. 3529 */ 3530 llsa = NULL; 3531 ll_ifma = NULL; 3532 if (ifp->if_resolvemulti != NULL) { 3533 /* Provide called function with buffer size information */ 3534 sdl.sdl_len = sizeof(sdl); 3535 llsa = (struct sockaddr *)&sdl; 3536 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3537 if (error) 3538 goto unlock_out; 3539 } 3540 3541 /* 3542 * Allocate the new address. Don't hook it up yet, as we may also 3543 * need to allocate a link layer multicast address. 3544 */ 3545 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3546 if (ifma == NULL) { 3547 error = ENOMEM; 3548 goto free_llsa_out; 3549 } 3550 3551 /* 3552 * If a link layer address is found, we'll need to see if it's 3553 * already present in the address list, or allocate is as well. 3554 * When this block finishes, the link layer address will be on the 3555 * list. 3556 */ 3557 if (llsa != NULL) { 3558 ll_ifma = if_findmulti(ifp, llsa); 3559 if (ll_ifma == NULL) { 3560 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3561 if (ll_ifma == NULL) { 3562 --ifma->ifma_refcount; 3563 if_freemulti(ifma); 3564 error = ENOMEM; 3565 goto free_llsa_out; 3566 } 3567 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3568 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3569 ifma_link); 3570 } else 3571 ll_ifma->ifma_refcount++; 3572 ifma->ifma_llifma = ll_ifma; 3573 } 3574 3575 /* 3576 * We now have a new multicast address, ifma, and possibly a new or 3577 * referenced link layer address. Add the primary address to the 3578 * ifnet address list. 3579 */ 3580 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3581 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3582 3583 if (retifma != NULL) 3584 *retifma = ifma; 3585 3586 /* 3587 * Must generate the message while holding the lock so that 'ifma' 3588 * pointer is still valid. 3589 */ 3590 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3591 IF_ADDR_WUNLOCK(ifp); 3592 3593 /* 3594 * We are certain we have added something, so call down to the 3595 * interface to let them know about it. 3596 */ 3597 if (ifp->if_ioctl != NULL) { 3598 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3599 } 3600 3601 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3602 link_free_sdl(llsa); 3603 3604 return (0); 3605 3606 free_llsa_out: 3607 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3608 link_free_sdl(llsa); 3609 3610 unlock_out: 3611 IF_ADDR_WUNLOCK(ifp); 3612 return (error); 3613 } 3614 3615 /* 3616 * Delete a multicast group membership by network-layer group address. 3617 * 3618 * Returns ENOENT if the entry could not be found. If ifp no longer 3619 * exists, results are undefined. This entry point should only be used 3620 * from subsystems which do appropriate locking to hold ifp for the 3621 * duration of the call. 3622 * Network-layer protocol domains must use if_delmulti_ifma(). 3623 */ 3624 int 3625 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3626 { 3627 struct ifmultiaddr *ifma; 3628 int lastref; 3629 #ifdef INVARIANTS 3630 struct epoch_tracker et; 3631 struct ifnet *oifp; 3632 3633 NET_EPOCH_ENTER(et); 3634 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3635 if (ifp == oifp) 3636 break; 3637 if (ifp != oifp) 3638 ifp = NULL; 3639 NET_EPOCH_EXIT(et); 3640 3641 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3642 #endif 3643 if (ifp == NULL) 3644 return (ENOENT); 3645 3646 IF_ADDR_WLOCK(ifp); 3647 lastref = 0; 3648 ifma = if_findmulti(ifp, sa); 3649 if (ifma != NULL) 3650 lastref = if_delmulti_locked(ifp, ifma, 0); 3651 IF_ADDR_WUNLOCK(ifp); 3652 3653 if (ifma == NULL) 3654 return (ENOENT); 3655 3656 if (lastref && ifp->if_ioctl != NULL) { 3657 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3658 } 3659 3660 return (0); 3661 } 3662 3663 /* 3664 * Delete all multicast group membership for an interface. 3665 * Should be used to quickly flush all multicast filters. 3666 */ 3667 void 3668 if_delallmulti(struct ifnet *ifp) 3669 { 3670 struct ifmultiaddr *ifma; 3671 struct ifmultiaddr *next; 3672 3673 IF_ADDR_WLOCK(ifp); 3674 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3675 if_delmulti_locked(ifp, ifma, 0); 3676 IF_ADDR_WUNLOCK(ifp); 3677 } 3678 3679 void 3680 if_delmulti_ifma(struct ifmultiaddr *ifma) 3681 { 3682 if_delmulti_ifma_flags(ifma, 0); 3683 } 3684 3685 /* 3686 * Delete a multicast group membership by group membership pointer. 3687 * Network-layer protocol domains must use this routine. 3688 * 3689 * It is safe to call this routine if the ifp disappeared. 3690 */ 3691 void 3692 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3693 { 3694 struct ifnet *ifp; 3695 int lastref; 3696 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3697 #ifdef INET 3698 IN_MULTI_LIST_UNLOCK_ASSERT(); 3699 #endif 3700 ifp = ifma->ifma_ifp; 3701 #ifdef DIAGNOSTIC 3702 if (ifp == NULL) { 3703 printf("%s: ifma_ifp seems to be detached\n", __func__); 3704 } else { 3705 struct epoch_tracker et; 3706 struct ifnet *oifp; 3707 3708 NET_EPOCH_ENTER(et); 3709 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3710 if (ifp == oifp) 3711 break; 3712 if (ifp != oifp) 3713 ifp = NULL; 3714 NET_EPOCH_EXIT(et); 3715 } 3716 #endif 3717 /* 3718 * If and only if the ifnet instance exists: Acquire the address lock. 3719 */ 3720 if (ifp != NULL) 3721 IF_ADDR_WLOCK(ifp); 3722 3723 lastref = if_delmulti_locked(ifp, ifma, flags); 3724 3725 if (ifp != NULL) { 3726 /* 3727 * If and only if the ifnet instance exists: 3728 * Release the address lock. 3729 * If the group was left: update the hardware hash filter. 3730 */ 3731 IF_ADDR_WUNLOCK(ifp); 3732 if (lastref && ifp->if_ioctl != NULL) { 3733 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3734 } 3735 } 3736 } 3737 3738 /* 3739 * Perform deletion of network-layer and/or link-layer multicast address. 3740 * 3741 * Return 0 if the reference count was decremented. 3742 * Return 1 if the final reference was released, indicating that the 3743 * hardware hash filter should be reprogrammed. 3744 */ 3745 static int 3746 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3747 { 3748 struct ifmultiaddr *ll_ifma; 3749 3750 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3751 KASSERT(ifma->ifma_ifp == ifp, 3752 ("%s: inconsistent ifp %p", __func__, ifp)); 3753 IF_ADDR_WLOCK_ASSERT(ifp); 3754 } 3755 3756 ifp = ifma->ifma_ifp; 3757 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3758 3759 /* 3760 * If the ifnet is detaching, null out references to ifnet, 3761 * so that upper protocol layers will notice, and not attempt 3762 * to obtain locks for an ifnet which no longer exists. The 3763 * routing socket announcement must happen before the ifnet 3764 * instance is detached from the system. 3765 */ 3766 if (detaching) { 3767 #ifdef DIAGNOSTIC 3768 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3769 #endif 3770 /* 3771 * ifp may already be nulled out if we are being reentered 3772 * to delete the ll_ifma. 3773 */ 3774 if (ifp != NULL) { 3775 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3776 ifma->ifma_ifp = NULL; 3777 } 3778 } 3779 3780 if (--ifma->ifma_refcount > 0) 3781 return 0; 3782 3783 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3784 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3785 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3786 } 3787 /* 3788 * If this ifma is a network-layer ifma, a link-layer ifma may 3789 * have been associated with it. Release it first if so. 3790 */ 3791 ll_ifma = ifma->ifma_llifma; 3792 if (ll_ifma != NULL) { 3793 KASSERT(ifma->ifma_lladdr != NULL, 3794 ("%s: llifma w/o lladdr", __func__)); 3795 if (detaching) 3796 ll_ifma->ifma_ifp = NULL; /* XXX */ 3797 if (--ll_ifma->ifma_refcount == 0) { 3798 if (ifp != NULL) { 3799 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3800 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3801 ifma_link); 3802 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3803 } 3804 } 3805 if_freemulti(ll_ifma); 3806 } 3807 } 3808 #ifdef INVARIANTS 3809 if (ifp) { 3810 struct ifmultiaddr *ifmatmp; 3811 3812 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3813 MPASS(ifma != ifmatmp); 3814 } 3815 #endif 3816 if_freemulti(ifma); 3817 /* 3818 * The last reference to this instance of struct ifmultiaddr 3819 * was released; the hardware should be notified of this change. 3820 */ 3821 return 1; 3822 } 3823 3824 /* 3825 * Set the link layer address on an interface. 3826 * 3827 * At this time we only support certain types of interfaces, 3828 * and we don't allow the length of the address to change. 3829 * 3830 * Set noinline to be dtrace-friendly 3831 */ 3832 __noinline int 3833 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3834 { 3835 struct sockaddr_dl *sdl; 3836 struct ifaddr *ifa; 3837 struct ifreq ifr; 3838 struct epoch_tracker et; 3839 int rc; 3840 3841 rc = 0; 3842 NET_EPOCH_ENTER(et); 3843 ifa = ifp->if_addr; 3844 if (ifa == NULL) { 3845 rc = EINVAL; 3846 goto out; 3847 } 3848 3849 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3850 if (sdl == NULL) { 3851 rc = EINVAL; 3852 goto out; 3853 } 3854 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3855 rc = EINVAL; 3856 goto out; 3857 } 3858 switch (ifp->if_type) { 3859 case IFT_ETHER: 3860 case IFT_XETHER: 3861 case IFT_L2VLAN: 3862 case IFT_BRIDGE: 3863 case IFT_IEEE8023ADLAG: 3864 bcopy(lladdr, LLADDR(sdl), len); 3865 break; 3866 default: 3867 rc = ENODEV; 3868 goto out; 3869 } 3870 3871 /* 3872 * If the interface is already up, we need 3873 * to re-init it in order to reprogram its 3874 * address filter. 3875 */ 3876 NET_EPOCH_EXIT(et); 3877 if ((ifp->if_flags & IFF_UP) != 0) { 3878 if (ifp->if_ioctl) { 3879 ifp->if_flags &= ~IFF_UP; 3880 ifr.ifr_flags = ifp->if_flags & 0xffff; 3881 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3882 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3883 ifp->if_flags |= IFF_UP; 3884 ifr.ifr_flags = ifp->if_flags & 0xffff; 3885 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3886 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3887 } 3888 } 3889 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3890 return (0); 3891 out: 3892 NET_EPOCH_EXIT(et); 3893 return (rc); 3894 } 3895 3896 /* 3897 * Compat function for handling basic encapsulation requests. 3898 * Not converted stacks (FDDI, IB, ..) supports traditional 3899 * output model: ARP (and other similar L2 protocols) are handled 3900 * inside output routine, arpresolve/nd6_resolve() returns MAC 3901 * address instead of full prepend. 3902 * 3903 * This function creates calculated header==MAC for IPv4/IPv6 and 3904 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3905 * address families. 3906 */ 3907 static int 3908 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3909 { 3910 3911 if (req->rtype != IFENCAP_LL) 3912 return (EOPNOTSUPP); 3913 3914 if (req->bufsize < req->lladdr_len) 3915 return (ENOMEM); 3916 3917 switch (req->family) { 3918 case AF_INET: 3919 case AF_INET6: 3920 break; 3921 default: 3922 return (EAFNOSUPPORT); 3923 } 3924 3925 /* Copy lladdr to storage as is */ 3926 memmove(req->buf, req->lladdr, req->lladdr_len); 3927 req->bufsize = req->lladdr_len; 3928 req->lladdr_off = 0; 3929 3930 return (0); 3931 } 3932 3933 /* 3934 * Tunnel interfaces can nest, also they may cause infinite recursion 3935 * calls when misconfigured. We'll prevent this by detecting loops. 3936 * High nesting level may cause stack exhaustion. We'll prevent this 3937 * by introducing upper limit. 3938 * 3939 * Return 0, if tunnel nesting count is equal or less than limit. 3940 */ 3941 int 3942 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3943 int limit) 3944 { 3945 struct m_tag *mtag; 3946 int count; 3947 3948 count = 1; 3949 mtag = NULL; 3950 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3951 if (*(struct ifnet **)(mtag + 1) == ifp) { 3952 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3953 return (EIO); 3954 } 3955 count++; 3956 } 3957 if (count > limit) { 3958 log(LOG_NOTICE, 3959 "%s: if_output recursively called too many times(%d)\n", 3960 if_name(ifp), count); 3961 return (EIO); 3962 } 3963 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3964 if (mtag == NULL) 3965 return (ENOMEM); 3966 *(struct ifnet **)(mtag + 1) = ifp; 3967 m_tag_prepend(m, mtag); 3968 return (0); 3969 } 3970 3971 /* 3972 * Get the link layer address that was read from the hardware at attach. 3973 * 3974 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3975 * their component interfaces as IFT_IEEE8023ADLAG. 3976 */ 3977 int 3978 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3979 { 3980 3981 if (ifp->if_hw_addr == NULL) 3982 return (ENODEV); 3983 3984 switch (ifp->if_type) { 3985 case IFT_ETHER: 3986 case IFT_IEEE8023ADLAG: 3987 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3988 return (0); 3989 default: 3990 return (ENODEV); 3991 } 3992 } 3993 3994 /* 3995 * The name argument must be a pointer to storage which will last as 3996 * long as the interface does. For physical devices, the result of 3997 * device_get_name(dev) is a good choice and for pseudo-devices a 3998 * static string works well. 3999 */ 4000 void 4001 if_initname(struct ifnet *ifp, const char *name, int unit) 4002 { 4003 ifp->if_dname = name; 4004 ifp->if_dunit = unit; 4005 if (unit != IF_DUNIT_NONE) 4006 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 4007 else 4008 strlcpy(ifp->if_xname, name, IFNAMSIZ); 4009 } 4010 4011 int 4012 if_printf(struct ifnet *ifp, const char *fmt, ...) 4013 { 4014 char if_fmt[256]; 4015 va_list ap; 4016 4017 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 4018 va_start(ap, fmt); 4019 vlog(LOG_INFO, if_fmt, ap); 4020 va_end(ap); 4021 return (0); 4022 } 4023 4024 void 4025 if_start(struct ifnet *ifp) 4026 { 4027 4028 (*(ifp)->if_start)(ifp); 4029 } 4030 4031 /* 4032 * Backwards compatibility interface for drivers 4033 * that have not implemented it 4034 */ 4035 static int 4036 if_transmit(struct ifnet *ifp, struct mbuf *m) 4037 { 4038 int error; 4039 4040 IFQ_HANDOFF(ifp, m, error); 4041 return (error); 4042 } 4043 4044 static void 4045 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4046 { 4047 4048 m_freem(m); 4049 } 4050 4051 int 4052 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4053 { 4054 int active = 0; 4055 4056 IF_LOCK(ifq); 4057 if (_IF_QFULL(ifq)) { 4058 IF_UNLOCK(ifq); 4059 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4060 m_freem(m); 4061 return (0); 4062 } 4063 if (ifp != NULL) { 4064 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4065 if (m->m_flags & (M_BCAST|M_MCAST)) 4066 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4067 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4068 } 4069 _IF_ENQUEUE(ifq, m); 4070 IF_UNLOCK(ifq); 4071 if (ifp != NULL && !active) 4072 (*(ifp)->if_start)(ifp); 4073 return (1); 4074 } 4075 4076 void 4077 if_register_com_alloc(u_char type, 4078 if_com_alloc_t *a, if_com_free_t *f) 4079 { 4080 4081 KASSERT(if_com_alloc[type] == NULL, 4082 ("if_register_com_alloc: %d already registered", type)); 4083 KASSERT(if_com_free[type] == NULL, 4084 ("if_register_com_alloc: %d free already registered", type)); 4085 4086 if_com_alloc[type] = a; 4087 if_com_free[type] = f; 4088 } 4089 4090 void 4091 if_deregister_com_alloc(u_char type) 4092 { 4093 4094 KASSERT(if_com_alloc[type] != NULL, 4095 ("if_deregister_com_alloc: %d not registered", type)); 4096 KASSERT(if_com_free[type] != NULL, 4097 ("if_deregister_com_alloc: %d free not registered", type)); 4098 if_com_alloc[type] = NULL; 4099 if_com_free[type] = NULL; 4100 } 4101 4102 /* API for driver access to network stack owned ifnet.*/ 4103 uint64_t 4104 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4105 { 4106 uint64_t oldbrate; 4107 4108 oldbrate = ifp->if_baudrate; 4109 ifp->if_baudrate = baudrate; 4110 return (oldbrate); 4111 } 4112 4113 uint64_t 4114 if_getbaudrate(if_t ifp) 4115 { 4116 4117 return (((struct ifnet *)ifp)->if_baudrate); 4118 } 4119 4120 int 4121 if_setcapabilities(if_t ifp, int capabilities) 4122 { 4123 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4124 return (0); 4125 } 4126 4127 int 4128 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4129 { 4130 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4131 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4132 4133 return (0); 4134 } 4135 4136 int 4137 if_getcapabilities(if_t ifp) 4138 { 4139 return ((struct ifnet *)ifp)->if_capabilities; 4140 } 4141 4142 int 4143 if_setcapenable(if_t ifp, int capabilities) 4144 { 4145 ((struct ifnet *)ifp)->if_capenable = capabilities; 4146 return (0); 4147 } 4148 4149 int 4150 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4151 { 4152 if(setcap) 4153 ((struct ifnet *)ifp)->if_capenable |= setcap; 4154 if(clearcap) 4155 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4156 4157 return (0); 4158 } 4159 4160 const char * 4161 if_getdname(if_t ifp) 4162 { 4163 return ((struct ifnet *)ifp)->if_dname; 4164 } 4165 4166 int 4167 if_togglecapenable(if_t ifp, int togglecap) 4168 { 4169 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4170 return (0); 4171 } 4172 4173 int 4174 if_getcapenable(if_t ifp) 4175 { 4176 return ((struct ifnet *)ifp)->if_capenable; 4177 } 4178 4179 /* 4180 * This is largely undesirable because it ties ifnet to a device, but does 4181 * provide flexiblity for an embedded product vendor. Should be used with 4182 * the understanding that it violates the interface boundaries, and should be 4183 * a last resort only. 4184 */ 4185 int 4186 if_setdev(if_t ifp, void *dev) 4187 { 4188 return (0); 4189 } 4190 4191 int 4192 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4193 { 4194 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4195 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4196 4197 return (0); 4198 } 4199 4200 int 4201 if_getdrvflags(if_t ifp) 4202 { 4203 return ((struct ifnet *)ifp)->if_drv_flags; 4204 } 4205 4206 int 4207 if_setdrvflags(if_t ifp, int flags) 4208 { 4209 ((struct ifnet *)ifp)->if_drv_flags = flags; 4210 return (0); 4211 } 4212 4213 4214 int 4215 if_setflags(if_t ifp, int flags) 4216 { 4217 ((struct ifnet *)ifp)->if_flags = flags; 4218 return (0); 4219 } 4220 4221 int 4222 if_setflagbits(if_t ifp, int set, int clear) 4223 { 4224 ((struct ifnet *)ifp)->if_flags |= set; 4225 ((struct ifnet *)ifp)->if_flags &= ~clear; 4226 4227 return (0); 4228 } 4229 4230 int 4231 if_getflags(if_t ifp) 4232 { 4233 return ((struct ifnet *)ifp)->if_flags; 4234 } 4235 4236 int 4237 if_clearhwassist(if_t ifp) 4238 { 4239 ((struct ifnet *)ifp)->if_hwassist = 0; 4240 return (0); 4241 } 4242 4243 int 4244 if_sethwassistbits(if_t ifp, int toset, int toclear) 4245 { 4246 ((struct ifnet *)ifp)->if_hwassist |= toset; 4247 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4248 4249 return (0); 4250 } 4251 4252 int 4253 if_sethwassist(if_t ifp, int hwassist_bit) 4254 { 4255 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4256 return (0); 4257 } 4258 4259 int 4260 if_gethwassist(if_t ifp) 4261 { 4262 return ((struct ifnet *)ifp)->if_hwassist; 4263 } 4264 4265 int 4266 if_setmtu(if_t ifp, int mtu) 4267 { 4268 ((struct ifnet *)ifp)->if_mtu = mtu; 4269 return (0); 4270 } 4271 4272 int 4273 if_getmtu(if_t ifp) 4274 { 4275 return ((struct ifnet *)ifp)->if_mtu; 4276 } 4277 4278 int 4279 if_getmtu_family(if_t ifp, int family) 4280 { 4281 struct domain *dp; 4282 4283 for (dp = domains; dp; dp = dp->dom_next) { 4284 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4285 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4286 } 4287 4288 return (((struct ifnet *)ifp)->if_mtu); 4289 } 4290 4291 int 4292 if_setsoftc(if_t ifp, void *softc) 4293 { 4294 ((struct ifnet *)ifp)->if_softc = softc; 4295 return (0); 4296 } 4297 4298 void * 4299 if_getsoftc(if_t ifp) 4300 { 4301 return ((struct ifnet *)ifp)->if_softc; 4302 } 4303 4304 void 4305 if_setrcvif(struct mbuf *m, if_t ifp) 4306 { 4307 4308 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4309 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4310 } 4311 4312 void 4313 if_setvtag(struct mbuf *m, uint16_t tag) 4314 { 4315 m->m_pkthdr.ether_vtag = tag; 4316 } 4317 4318 uint16_t 4319 if_getvtag(struct mbuf *m) 4320 { 4321 4322 return (m->m_pkthdr.ether_vtag); 4323 } 4324 4325 int 4326 if_sendq_empty(if_t ifp) 4327 { 4328 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4329 } 4330 4331 struct ifaddr * 4332 if_getifaddr(if_t ifp) 4333 { 4334 return ((struct ifnet *)ifp)->if_addr; 4335 } 4336 4337 int 4338 if_getamcount(if_t ifp) 4339 { 4340 return ((struct ifnet *)ifp)->if_amcount; 4341 } 4342 4343 4344 int 4345 if_setsendqready(if_t ifp) 4346 { 4347 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4348 return (0); 4349 } 4350 4351 int 4352 if_setsendqlen(if_t ifp, int tx_desc_count) 4353 { 4354 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4355 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4356 4357 return (0); 4358 } 4359 4360 int 4361 if_vlantrunkinuse(if_t ifp) 4362 { 4363 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4364 } 4365 4366 int 4367 if_input(if_t ifp, struct mbuf* sendmp) 4368 { 4369 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4370 return (0); 4371 4372 } 4373 4374 /* XXX */ 4375 #ifndef ETH_ADDR_LEN 4376 #define ETH_ADDR_LEN 6 4377 #endif 4378 4379 int 4380 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4381 { 4382 struct ifmultiaddr *ifma; 4383 uint8_t *lmta = (uint8_t *)mta; 4384 int mcnt = 0; 4385 4386 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4387 if (ifma->ifma_addr->sa_family != AF_LINK) 4388 continue; 4389 4390 if (mcnt == max) 4391 break; 4392 4393 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4394 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4395 mcnt++; 4396 } 4397 *cnt = mcnt; 4398 4399 return (0); 4400 } 4401 4402 int 4403 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4404 { 4405 int error; 4406 4407 if_maddr_rlock(ifp); 4408 error = if_setupmultiaddr(ifp, mta, cnt, max); 4409 if_maddr_runlock(ifp); 4410 return (error); 4411 } 4412 4413 int 4414 if_multiaddr_count(if_t ifp, int max) 4415 { 4416 struct ifmultiaddr *ifma; 4417 int count; 4418 4419 count = 0; 4420 if_maddr_rlock(ifp); 4421 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4422 if (ifma->ifma_addr->sa_family != AF_LINK) 4423 continue; 4424 count++; 4425 if (count == max) 4426 break; 4427 } 4428 if_maddr_runlock(ifp); 4429 return (count); 4430 } 4431 4432 int 4433 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4434 { 4435 struct ifmultiaddr *ifma; 4436 int cnt = 0; 4437 4438 if_maddr_rlock(ifp); 4439 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4440 cnt += filter(arg, ifma, cnt); 4441 if_maddr_runlock(ifp); 4442 return (cnt); 4443 } 4444 4445 struct mbuf * 4446 if_dequeue(if_t ifp) 4447 { 4448 struct mbuf *m; 4449 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4450 4451 return (m); 4452 } 4453 4454 int 4455 if_sendq_prepend(if_t ifp, struct mbuf *m) 4456 { 4457 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4458 return (0); 4459 } 4460 4461 int 4462 if_setifheaderlen(if_t ifp, int len) 4463 { 4464 ((struct ifnet *)ifp)->if_hdrlen = len; 4465 return (0); 4466 } 4467 4468 caddr_t 4469 if_getlladdr(if_t ifp) 4470 { 4471 return (IF_LLADDR((struct ifnet *)ifp)); 4472 } 4473 4474 void * 4475 if_gethandle(u_char type) 4476 { 4477 return (if_alloc(type)); 4478 } 4479 4480 void 4481 if_bpfmtap(if_t ifh, struct mbuf *m) 4482 { 4483 struct ifnet *ifp = (struct ifnet *)ifh; 4484 4485 BPF_MTAP(ifp, m); 4486 } 4487 4488 void 4489 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4490 { 4491 struct ifnet *ifp = (struct ifnet *)ifh; 4492 4493 ETHER_BPF_MTAP(ifp, m); 4494 } 4495 4496 void 4497 if_vlancap(if_t ifh) 4498 { 4499 struct ifnet *ifp = (struct ifnet *)ifh; 4500 VLAN_CAPABILITIES(ifp); 4501 } 4502 4503 int 4504 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4505 { 4506 4507 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4508 return (0); 4509 } 4510 4511 int 4512 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4513 { 4514 4515 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4516 return (0); 4517 } 4518 4519 int 4520 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4521 { 4522 4523 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4524 return (0); 4525 } 4526 4527 u_int 4528 if_gethwtsomax(if_t ifp) 4529 { 4530 4531 return (((struct ifnet *)ifp)->if_hw_tsomax); 4532 } 4533 4534 u_int 4535 if_gethwtsomaxsegcount(if_t ifp) 4536 { 4537 4538 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4539 } 4540 4541 u_int 4542 if_gethwtsomaxsegsize(if_t ifp) 4543 { 4544 4545 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4546 } 4547 4548 void 4549 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4550 { 4551 ((struct ifnet *)ifp)->if_init = init_fn; 4552 } 4553 4554 void 4555 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4556 { 4557 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4558 } 4559 4560 void 4561 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4562 { 4563 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4564 } 4565 4566 void 4567 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4568 { 4569 ((struct ifnet *)ifp)->if_transmit = start_fn; 4570 } 4571 4572 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4573 { 4574 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4575 4576 } 4577 4578 void 4579 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4580 { 4581 4582 ifp->if_get_counter = fn; 4583 } 4584 4585 /* Revisit these - These are inline functions originally. */ 4586 int 4587 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4588 { 4589 return drbr_inuse(ifh, br); 4590 } 4591 4592 struct mbuf* 4593 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4594 { 4595 return drbr_dequeue(ifh, br); 4596 } 4597 4598 int 4599 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4600 { 4601 return drbr_needs_enqueue(ifh, br); 4602 } 4603 4604 int 4605 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4606 { 4607 return drbr_enqueue(ifh, br, m); 4608 4609 } 4610