1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_inet6.h" 36 #include "opt_inet.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/conf.h> 41 #include <sys/malloc.h> 42 #include <sys/sbuf.h> 43 #include <sys/bus.h> 44 #include <sys/epoch.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/refcount.h> 55 #include <sys/module.h> 56 #include <sys/rwlock.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/taskqueue.h> 62 #include <sys/domain.h> 63 #include <sys/jail.h> 64 #include <sys/priv.h> 65 66 #include <machine/stdarg.h> 67 #include <vm/uma.h> 68 69 #include <net/bpf.h> 70 #include <net/ethernet.h> 71 #include <net/if.h> 72 #include <net/if_arp.h> 73 #include <net/if_clone.h> 74 #include <net/if_dl.h> 75 #include <net/if_types.h> 76 #include <net/if_var.h> 77 #include <net/if_media.h> 78 #include <net/if_vlan_var.h> 79 #include <net/radix.h> 80 #include <net/route.h> 81 #include <net/vnet.h> 82 83 #if defined(INET) || defined(INET6) 84 #include <net/ethernet.h> 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_carp.h> 89 #ifdef INET 90 #include <netinet/if_ether.h> 91 #include <netinet/netdump/netdump.h> 92 #endif /* INET */ 93 #ifdef INET6 94 #include <netinet6/in6_var.h> 95 #include <netinet6/in6_ifattach.h> 96 #endif /* INET6 */ 97 #endif /* INET || INET6 */ 98 99 #include <security/mac/mac_framework.h> 100 101 /* 102 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 103 * and ifr_ifru when it is used in SIOCGIFCONF. 104 */ 105 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 106 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 107 108 __read_mostly epoch_t net_epoch_preempt; 109 __read_mostly epoch_t net_epoch; 110 #ifdef COMPAT_FREEBSD32 111 #include <sys/mount.h> 112 #include <compat/freebsd32/freebsd32.h> 113 114 struct ifreq_buffer32 { 115 uint32_t length; /* (size_t) */ 116 uint32_t buffer; /* (void *) */ 117 }; 118 119 /* 120 * Interface request structure used for socket 121 * ioctl's. All interface ioctl's must have parameter 122 * definitions which begin with ifr_name. The 123 * remainder may be interface specific. 124 */ 125 struct ifreq32 { 126 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 127 union { 128 struct sockaddr ifru_addr; 129 struct sockaddr ifru_dstaddr; 130 struct sockaddr ifru_broadaddr; 131 struct ifreq_buffer32 ifru_buffer; 132 short ifru_flags[2]; 133 short ifru_index; 134 int ifru_jid; 135 int ifru_metric; 136 int ifru_mtu; 137 int ifru_phys; 138 int ifru_media; 139 uint32_t ifru_data; 140 int ifru_cap[2]; 141 u_int ifru_fib; 142 u_char ifru_vlan_pcp; 143 } ifr_ifru; 144 }; 145 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 146 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 147 __offsetof(struct ifreq32, ifr_ifru)); 148 149 struct ifgroupreq32 { 150 char ifgr_name[IFNAMSIZ]; 151 u_int ifgr_len; 152 union { 153 char ifgru_group[IFNAMSIZ]; 154 uint32_t ifgru_groups; 155 } ifgr_ifgru; 156 }; 157 158 struct ifmediareq32 { 159 char ifm_name[IFNAMSIZ]; 160 int ifm_current; 161 int ifm_mask; 162 int ifm_status; 163 int ifm_active; 164 int ifm_count; 165 uint32_t ifm_ulist; /* (int *) */ 166 }; 167 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 168 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 169 170 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 171 _IOC_NEWTYPE((cmd), struct ifgroupreq32): case 172 #else /* !COMPAT_FREEBSD32 */ 173 #define _CASE_IOC_IFGROUPREQ_32(cmd) 174 #endif /* !COMPAT_FREEBSD32 */ 175 176 #define CASE_IOC_IFGROUPREQ(cmd) \ 177 _CASE_IOC_IFGROUPREQ_32(cmd) \ 178 (cmd) 179 180 union ifreq_union { 181 struct ifreq ifr; 182 #ifdef COMPAT_FREEBSD32 183 struct ifreq32 ifr32; 184 #endif 185 }; 186 187 union ifgroupreq_union { 188 struct ifgroupreq ifgr; 189 #ifdef COMPAT_FREEBSD32 190 struct ifgroupreq32 ifgr32; 191 #endif 192 }; 193 194 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 195 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 196 197 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 198 &ifqmaxlen, 0, "max send queue size"); 199 200 /* Log link state change events */ 201 static int log_link_state_change = 1; 202 203 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 204 &log_link_state_change, 0, 205 "log interface link state change events"); 206 207 /* Log promiscuous mode change events */ 208 static int log_promisc_mode_change = 1; 209 210 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 211 &log_promisc_mode_change, 1, 212 "log promiscuous mode change events"); 213 214 /* Interface description */ 215 static unsigned int ifdescr_maxlen = 1024; 216 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 217 &ifdescr_maxlen, 0, 218 "administrative maximum length for interface description"); 219 220 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 221 222 /* global sx for non-critical path ifdescr */ 223 static struct sx ifdescr_sx; 224 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 225 226 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 227 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 228 /* These are external hooks for CARP. */ 229 void (*carp_linkstate_p)(struct ifnet *ifp); 230 void (*carp_demote_adj_p)(int, char *); 231 int (*carp_master_p)(struct ifaddr *); 232 #if defined(INET) || defined(INET6) 233 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 234 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 235 const struct sockaddr *sa); 236 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 237 int (*carp_attach_p)(struct ifaddr *, int); 238 void (*carp_detach_p)(struct ifaddr *, bool); 239 #endif 240 #ifdef INET 241 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 242 #endif 243 #ifdef INET6 244 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 245 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 246 const struct in6_addr *taddr); 247 #endif 248 249 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 250 251 /* 252 * XXX: Style; these should be sorted alphabetically, and unprototyped 253 * static functions should be prototyped. Currently they are sorted by 254 * declaration order. 255 */ 256 static void if_attachdomain(void *); 257 static void if_attachdomain1(struct ifnet *); 258 static int ifconf(u_long, caddr_t); 259 static void *if_grow(void); 260 static void if_input_default(struct ifnet *, struct mbuf *); 261 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 262 static void if_route(struct ifnet *, int flag, int fam); 263 static int if_setflag(struct ifnet *, int, int, int *, int); 264 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 265 static void if_unroute(struct ifnet *, int flag, int fam); 266 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 267 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 268 static void do_link_state_change(void *, int); 269 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 270 static int if_getgroupmembers(struct ifgroupreq *); 271 static void if_delgroups(struct ifnet *); 272 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 273 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 274 #ifdef VIMAGE 275 static void if_vmove(struct ifnet *, struct vnet *); 276 #endif 277 278 #ifdef INET6 279 /* 280 * XXX: declare here to avoid to include many inet6 related files.. 281 * should be more generalized? 282 */ 283 extern void nd6_setmtu(struct ifnet *); 284 #endif 285 286 /* ipsec helper hooks */ 287 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 289 290 VNET_DEFINE(int, if_index); 291 int ifqmaxlen = IFQ_MAXLEN; 292 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 293 VNET_DEFINE(struct ifgrouphead, ifg_head); 294 295 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 296 297 /* Table of ifnet by index. */ 298 VNET_DEFINE(struct ifnet **, ifindex_table); 299 300 #define V_if_indexlim VNET(if_indexlim) 301 #define V_ifindex_table VNET(ifindex_table) 302 303 /* 304 * The global network interface list (V_ifnet) and related state (such as 305 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 306 * an rwlock. Either may be acquired shared to stablize the list, but both 307 * must be acquired writable to modify the list. This model allows us to 308 * both stablize the interface list during interrupt thread processing, but 309 * also to stablize it over long-running ioctls, without introducing priority 310 * inversions and deadlocks. 311 */ 312 struct rwlock ifnet_rwlock; 313 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 314 struct sx ifnet_sxlock; 315 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 316 317 /* 318 * The allocation of network interfaces is a rather non-atomic affair; we 319 * need to select an index before we are ready to expose the interface for 320 * use, so will use this pointer value to indicate reservation. 321 */ 322 #define IFNET_HOLD (void *)(uintptr_t)(-1) 323 324 static if_com_alloc_t *if_com_alloc[256]; 325 static if_com_free_t *if_com_free[256]; 326 327 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 328 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 329 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 330 331 struct ifnet * 332 ifnet_byindex_locked(u_short idx) 333 { 334 335 if (idx > V_if_index) 336 return (NULL); 337 if (V_ifindex_table[idx] == IFNET_HOLD) 338 return (NULL); 339 return (V_ifindex_table[idx]); 340 } 341 342 struct ifnet * 343 ifnet_byindex(u_short idx) 344 { 345 struct ifnet *ifp; 346 347 ifp = ifnet_byindex_locked(idx); 348 return (ifp); 349 } 350 351 struct ifnet * 352 ifnet_byindex_ref(u_short idx) 353 { 354 struct 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(u_char type) 530 { 531 struct ifnet *ifp; 532 u_short idx; 533 void *old; 534 535 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 536 restart: 537 IFNET_WLOCK(); 538 idx = ifindex_alloc(&old); 539 if (__predict_false(idx == USHRT_MAX)) { 540 IFNET_WUNLOCK(); 541 epoch_wait_preempt(net_epoch_preempt); 542 free(old, M_IFNET); 543 goto restart; 544 } 545 ifnet_setbyindex(idx, IFNET_HOLD); 546 IFNET_WUNLOCK(); 547 ifp->if_index = idx; 548 ifp->if_type = type; 549 ifp->if_alloctype = type; 550 #ifdef VIMAGE 551 ifp->if_vnet = curvnet; 552 #endif 553 if (if_com_alloc[type] != NULL) { 554 ifp->if_l2com = if_com_alloc[type](type, ifp); 555 if (ifp->if_l2com == NULL) { 556 free(ifp, M_IFNET); 557 ifindex_free(idx); 558 return (NULL); 559 } 560 } 561 562 IF_ADDR_LOCK_INIT(ifp); 563 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 564 ifp->if_afdata_initialized = 0; 565 IF_AFDATA_LOCK_INIT(ifp); 566 CK_STAILQ_INIT(&ifp->if_addrhead); 567 CK_STAILQ_INIT(&ifp->if_multiaddrs); 568 CK_STAILQ_INIT(&ifp->if_groups); 569 #ifdef MAC 570 mac_ifnet_init(ifp); 571 #endif 572 ifq_init(&ifp->if_snd, ifp); 573 574 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 575 for (int i = 0; i < IFCOUNTERS; i++) 576 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 577 ifp->if_get_counter = if_get_counter_default; 578 ifp->if_pcp = IFNET_PCP_NONE; 579 ifnet_setbyindex(ifp->if_index, ifp); 580 return (ifp); 581 } 582 583 /* 584 * Do the actual work of freeing a struct ifnet, and layer 2 common 585 * structure. This call is made when the last reference to an 586 * interface is released. 587 */ 588 static void 589 if_free_internal(struct ifnet *ifp) 590 { 591 592 KASSERT((ifp->if_flags & IFF_DYING), 593 ("if_free_internal: interface not dying")); 594 595 if (if_com_free[ifp->if_alloctype] != NULL) 596 if_com_free[ifp->if_alloctype](ifp->if_l2com, 597 ifp->if_alloctype); 598 599 #ifdef MAC 600 mac_ifnet_destroy(ifp); 601 #endif /* MAC */ 602 IF_AFDATA_DESTROY(ifp); 603 IF_ADDR_LOCK_DESTROY(ifp); 604 ifq_delete(&ifp->if_snd); 605 606 for (int i = 0; i < IFCOUNTERS; i++) 607 counter_u64_free(ifp->if_counters[i]); 608 609 free(ifp->if_description, M_IFDESCR); 610 free(ifp->if_hw_addr, M_IFADDR); 611 free(ifp, M_IFNET); 612 } 613 614 static void 615 if_destroy(epoch_context_t ctx) 616 { 617 struct ifnet *ifp; 618 619 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 620 if_free_internal(ifp); 621 } 622 623 /* 624 * Deregister an interface and free the associated storage. 625 */ 626 void 627 if_free(struct ifnet *ifp) 628 { 629 630 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 631 632 CURVNET_SET_QUIET(ifp->if_vnet); 633 IFNET_WLOCK(); 634 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 635 ("%s: freeing unallocated ifnet", ifp->if_xname)); 636 637 ifindex_free_locked(ifp->if_index); 638 IFNET_WUNLOCK(); 639 640 if (refcount_release(&ifp->if_refcount)) 641 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 642 CURVNET_RESTORE(); 643 } 644 645 /* 646 * Interfaces to keep an ifnet type-stable despite the possibility of the 647 * driver calling if_free(). If there are additional references, we defer 648 * freeing the underlying data structure. 649 */ 650 void 651 if_ref(struct ifnet *ifp) 652 { 653 654 /* We don't assert the ifnet list lock here, but arguably should. */ 655 refcount_acquire(&ifp->if_refcount); 656 } 657 658 void 659 if_rele(struct ifnet *ifp) 660 { 661 662 if (!refcount_release(&ifp->if_refcount)) 663 return; 664 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 665 } 666 667 void 668 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 669 { 670 671 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 672 673 if (ifq->ifq_maxlen == 0) 674 ifq->ifq_maxlen = ifqmaxlen; 675 676 ifq->altq_type = 0; 677 ifq->altq_disc = NULL; 678 ifq->altq_flags &= ALTQF_CANTCHANGE; 679 ifq->altq_tbr = NULL; 680 ifq->altq_ifp = ifp; 681 } 682 683 void 684 ifq_delete(struct ifaltq *ifq) 685 { 686 mtx_destroy(&ifq->ifq_mtx); 687 } 688 689 /* 690 * Perform generic interface initialization tasks and attach the interface 691 * to the list of "active" interfaces. If vmove flag is set on entry 692 * to if_attach_internal(), perform only a limited subset of initialization 693 * tasks, given that we are moving from one vnet to another an ifnet which 694 * has already been fully initialized. 695 * 696 * Note that if_detach_internal() removes group membership unconditionally 697 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 698 * Thus, when if_vmove() is applied to a cloned interface, group membership 699 * is lost while a cloned one always joins a group whose name is 700 * ifc->ifc_name. To recover this after if_detach_internal() and 701 * if_attach_internal(), the cloner should be specified to 702 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 703 * attempts to join a group whose name is ifc->ifc_name. 704 * 705 * XXX: 706 * - The decision to return void and thus require this function to 707 * succeed is questionable. 708 * - We should probably do more sanity checking. For instance we don't 709 * do anything to insure if_xname is unique or non-empty. 710 */ 711 void 712 if_attach(struct ifnet *ifp) 713 { 714 715 if_attach_internal(ifp, 0, NULL); 716 } 717 718 /* 719 * Compute the least common TSO limit. 720 */ 721 void 722 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 723 { 724 /* 725 * 1) If there is no limit currently, take the limit from 726 * the network adapter. 727 * 728 * 2) If the network adapter has a limit below the current 729 * limit, apply it. 730 */ 731 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 732 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 733 pmax->tsomaxbytes = ifp->if_hw_tsomax; 734 } 735 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 736 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 737 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 738 } 739 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 740 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 741 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 742 } 743 } 744 745 /* 746 * Update TSO limit of a network adapter. 747 * 748 * Returns zero if no change. Else non-zero. 749 */ 750 int 751 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 752 { 753 int retval = 0; 754 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 755 ifp->if_hw_tsomax = pmax->tsomaxbytes; 756 retval++; 757 } 758 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 759 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 760 retval++; 761 } 762 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 763 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 764 retval++; 765 } 766 return (retval); 767 } 768 769 static void 770 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 771 { 772 unsigned socksize, ifasize; 773 int namelen, masklen; 774 struct sockaddr_dl *sdl; 775 struct ifaddr *ifa; 776 777 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 778 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 779 ifp->if_xname); 780 781 #ifdef VIMAGE 782 ifp->if_vnet = curvnet; 783 if (ifp->if_home_vnet == NULL) 784 ifp->if_home_vnet = curvnet; 785 #endif 786 787 if_addgroup(ifp, IFG_ALL); 788 789 /* Restore group membership for cloned interfaces. */ 790 if (vmove && ifc != NULL) 791 if_clone_addgroup(ifp, ifc); 792 793 getmicrotime(&ifp->if_lastchange); 794 ifp->if_epoch = time_uptime; 795 796 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 797 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 798 ("transmit and qflush must both either be set or both be NULL")); 799 if (ifp->if_transmit == NULL) { 800 ifp->if_transmit = if_transmit; 801 ifp->if_qflush = if_qflush; 802 } 803 if (ifp->if_input == NULL) 804 ifp->if_input = if_input_default; 805 806 if (ifp->if_requestencap == NULL) 807 ifp->if_requestencap = if_requestencap_default; 808 809 if (!vmove) { 810 #ifdef MAC 811 mac_ifnet_create(ifp); 812 #endif 813 814 /* 815 * Create a Link Level name for this device. 816 */ 817 namelen = strlen(ifp->if_xname); 818 /* 819 * Always save enough space for any possiable name so we 820 * can do a rename in place later. 821 */ 822 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 823 socksize = masklen + ifp->if_addrlen; 824 if (socksize < sizeof(*sdl)) 825 socksize = sizeof(*sdl); 826 socksize = roundup2(socksize, sizeof(long)); 827 ifasize = sizeof(*ifa) + 2 * socksize; 828 ifa = ifa_alloc(ifasize, M_WAITOK); 829 sdl = (struct sockaddr_dl *)(ifa + 1); 830 sdl->sdl_len = socksize; 831 sdl->sdl_family = AF_LINK; 832 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 833 sdl->sdl_nlen = namelen; 834 sdl->sdl_index = ifp->if_index; 835 sdl->sdl_type = ifp->if_type; 836 ifp->if_addr = ifa; 837 ifa->ifa_ifp = ifp; 838 ifa->ifa_rtrequest = link_rtrequest; 839 ifa->ifa_addr = (struct sockaddr *)sdl; 840 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 841 ifa->ifa_netmask = (struct sockaddr *)sdl; 842 sdl->sdl_len = masklen; 843 while (namelen != 0) 844 sdl->sdl_data[--namelen] = 0xff; 845 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 846 /* Reliably crash if used uninitialized. */ 847 ifp->if_broadcastaddr = NULL; 848 849 if (ifp->if_type == IFT_ETHER) { 850 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 851 M_WAITOK | M_ZERO); 852 } 853 854 #if defined(INET) || defined(INET6) 855 /* Use defaults for TSO, if nothing is set */ 856 if (ifp->if_hw_tsomax == 0 && 857 ifp->if_hw_tsomaxsegcount == 0 && 858 ifp->if_hw_tsomaxsegsize == 0) { 859 /* 860 * The TSO defaults needs to be such that an 861 * NFS mbuf list of 35 mbufs totalling just 862 * below 64K works and that a chain of mbufs 863 * can be defragged into at most 32 segments: 864 */ 865 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 866 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 867 ifp->if_hw_tsomaxsegcount = 35; 868 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 869 870 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 871 if (ifp->if_capabilities & IFCAP_TSO) { 872 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 873 ifp->if_hw_tsomax, 874 ifp->if_hw_tsomaxsegcount, 875 ifp->if_hw_tsomaxsegsize); 876 } 877 } 878 #endif 879 } 880 #ifdef VIMAGE 881 else { 882 /* 883 * Update the interface index in the link layer address 884 * of the interface. 885 */ 886 for (ifa = ifp->if_addr; ifa != NULL; 887 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 888 if (ifa->ifa_addr->sa_family == AF_LINK) { 889 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 890 sdl->sdl_index = ifp->if_index; 891 } 892 } 893 } 894 #endif 895 896 IFNET_WLOCK(); 897 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 898 #ifdef VIMAGE 899 curvnet->vnet_ifcnt++; 900 #endif 901 IFNET_WUNLOCK(); 902 903 if (domain_init_status >= 2) 904 if_attachdomain1(ifp); 905 906 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 907 if (IS_DEFAULT_VNET(curvnet)) 908 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 909 910 /* Announce the interface. */ 911 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 912 } 913 914 static void 915 if_epochalloc(void *dummy __unused) 916 { 917 918 net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT); 919 net_epoch = epoch_alloc(0); 920 } 921 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 922 if_epochalloc, NULL); 923 924 static void 925 if_attachdomain(void *dummy) 926 { 927 struct ifnet *ifp; 928 929 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 930 if_attachdomain1(ifp); 931 } 932 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 933 if_attachdomain, NULL); 934 935 static void 936 if_attachdomain1(struct ifnet *ifp) 937 { 938 struct domain *dp; 939 940 /* 941 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 942 * cannot lock ifp->if_afdata initialization, entirely. 943 */ 944 IF_AFDATA_LOCK(ifp); 945 if (ifp->if_afdata_initialized >= domain_init_status) { 946 IF_AFDATA_UNLOCK(ifp); 947 log(LOG_WARNING, "%s called more than once on %s\n", 948 __func__, ifp->if_xname); 949 return; 950 } 951 ifp->if_afdata_initialized = domain_init_status; 952 IF_AFDATA_UNLOCK(ifp); 953 954 /* address family dependent data region */ 955 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 956 for (dp = domains; dp; dp = dp->dom_next) { 957 if (dp->dom_ifattach) 958 ifp->if_afdata[dp->dom_family] = 959 (*dp->dom_ifattach)(ifp); 960 } 961 } 962 963 /* 964 * Remove any unicast or broadcast network addresses from an interface. 965 */ 966 void 967 if_purgeaddrs(struct ifnet *ifp) 968 { 969 struct ifaddr *ifa; 970 971 while (1) { 972 struct epoch_tracker et; 973 974 NET_EPOCH_ENTER(et); 975 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 976 if (ifa->ifa_addr->sa_family != AF_LINK) 977 break; 978 } 979 NET_EPOCH_EXIT(et); 980 981 if (ifa == NULL) 982 break; 983 #ifdef INET 984 /* XXX: Ugly!! ad hoc just for INET */ 985 if (ifa->ifa_addr->sa_family == AF_INET) { 986 struct ifaliasreq ifr; 987 988 bzero(&ifr, sizeof(ifr)); 989 ifr.ifra_addr = *ifa->ifa_addr; 990 if (ifa->ifa_dstaddr) 991 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 992 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 993 NULL) == 0) 994 continue; 995 } 996 #endif /* INET */ 997 #ifdef INET6 998 if (ifa->ifa_addr->sa_family == AF_INET6) { 999 in6_purgeaddr(ifa); 1000 /* ifp_addrhead is already updated */ 1001 continue; 1002 } 1003 #endif /* INET6 */ 1004 IF_ADDR_WLOCK(ifp); 1005 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1006 IF_ADDR_WUNLOCK(ifp); 1007 ifa_free(ifa); 1008 } 1009 } 1010 1011 /* 1012 * Remove any multicast network addresses from an interface when an ifnet 1013 * is going away. 1014 */ 1015 static void 1016 if_purgemaddrs(struct ifnet *ifp) 1017 { 1018 struct ifmultiaddr *ifma; 1019 1020 IF_ADDR_WLOCK(ifp); 1021 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1022 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1023 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1024 if_delmulti_locked(ifp, ifma, 1); 1025 } 1026 IF_ADDR_WUNLOCK(ifp); 1027 } 1028 1029 /* 1030 * Detach an interface, removing it from the list of "active" interfaces. 1031 * If vmove flag is set on entry to if_detach_internal(), perform only a 1032 * limited subset of cleanup tasks, given that we are moving an ifnet from 1033 * one vnet to another, where it must be fully operational. 1034 * 1035 * XXXRW: There are some significant questions about event ordering, and 1036 * how to prevent things from starting to use the interface during detach. 1037 */ 1038 void 1039 if_detach(struct ifnet *ifp) 1040 { 1041 1042 CURVNET_SET_QUIET(ifp->if_vnet); 1043 if_detach_internal(ifp, 0, NULL); 1044 CURVNET_RESTORE(); 1045 } 1046 1047 /* 1048 * The vmove flag, if set, indicates that we are called from a callpath 1049 * that is moving an interface to a different vnet instance. 1050 * 1051 * The shutdown flag, if set, indicates that we are called in the 1052 * process of shutting down a vnet instance. Currently only the 1053 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1054 * on a vnet instance shutdown without this flag being set, e.g., when 1055 * the cloned interfaces are destoyed as first thing of teardown. 1056 */ 1057 static int 1058 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1059 { 1060 struct ifaddr *ifa; 1061 int i; 1062 struct domain *dp; 1063 struct ifnet *iter; 1064 int found = 0; 1065 #ifdef VIMAGE 1066 int shutdown; 1067 1068 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1069 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1070 #endif 1071 IFNET_WLOCK(); 1072 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1073 if (iter == ifp) { 1074 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1075 if (!vmove) 1076 ifp->if_flags |= IFF_DYING; 1077 found = 1; 1078 break; 1079 } 1080 IFNET_WUNLOCK(); 1081 if (!found) { 1082 /* 1083 * While we would want to panic here, we cannot 1084 * guarantee that the interface is indeed still on 1085 * the list given we don't hold locks all the way. 1086 */ 1087 return (ENOENT); 1088 #if 0 1089 if (vmove) 1090 panic("%s: ifp=%p not on the ifnet tailq %p", 1091 __func__, ifp, &V_ifnet); 1092 else 1093 return; /* XXX this should panic as well? */ 1094 #endif 1095 } 1096 1097 /* 1098 * At this point we know the interface still was on the ifnet list 1099 * and we removed it so we are in a stable state. 1100 */ 1101 #ifdef VIMAGE 1102 curvnet->vnet_ifcnt--; 1103 #endif 1104 epoch_wait_preempt(net_epoch_preempt); 1105 /* 1106 * In any case (destroy or vmove) detach us from the groups 1107 * and remove/wait for pending events on the taskq. 1108 * XXX-BZ in theory an interface could still enqueue a taskq change? 1109 */ 1110 if_delgroups(ifp); 1111 1112 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1113 1114 /* 1115 * Check if this is a cloned interface or not. Must do even if 1116 * shutting down as a if_vmove_reclaim() would move the ifp and 1117 * the if_clone_addgroup() will have a corrupted string overwise 1118 * from a gibberish pointer. 1119 */ 1120 if (vmove && ifcp != NULL) 1121 *ifcp = if_clone_findifc(ifp); 1122 1123 if_down(ifp); 1124 1125 #ifdef VIMAGE 1126 /* 1127 * On VNET shutdown abort here as the stack teardown will do all 1128 * the work top-down for us. 1129 */ 1130 if (shutdown) { 1131 /* Give interface users the chance to clean up. */ 1132 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1133 1134 /* 1135 * In case of a vmove we are done here without error. 1136 * If we would signal an error it would lead to the same 1137 * abort as if we did not find the ifnet anymore. 1138 * if_detach() calls us in void context and does not care 1139 * about an early abort notification, so life is splendid :) 1140 */ 1141 goto finish_vnet_shutdown; 1142 } 1143 #endif 1144 1145 /* 1146 * At this point we are not tearing down a VNET and are either 1147 * going to destroy or vmove the interface and have to cleanup 1148 * accordingly. 1149 */ 1150 1151 /* 1152 * Remove routes and flush queues. 1153 */ 1154 #ifdef ALTQ 1155 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1156 altq_disable(&ifp->if_snd); 1157 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1158 altq_detach(&ifp->if_snd); 1159 #endif 1160 1161 if_purgeaddrs(ifp); 1162 1163 #ifdef INET 1164 in_ifdetach(ifp); 1165 #endif 1166 1167 #ifdef INET6 1168 /* 1169 * Remove all IPv6 kernel structs related to ifp. This should be done 1170 * before removing routing entries below, since IPv6 interface direct 1171 * routes are expected to be removed by the IPv6-specific kernel API. 1172 * Otherwise, the kernel will detect some inconsistency and bark it. 1173 */ 1174 in6_ifdetach(ifp); 1175 #endif 1176 if_purgemaddrs(ifp); 1177 1178 /* Announce that the interface is gone. */ 1179 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1180 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1181 if (IS_DEFAULT_VNET(curvnet)) 1182 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1183 1184 if (!vmove) { 1185 /* 1186 * Prevent further calls into the device driver via ifnet. 1187 */ 1188 if_dead(ifp); 1189 1190 /* 1191 * Clean up all addresses. 1192 */ 1193 IF_ADDR_WLOCK(ifp); 1194 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1195 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1196 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1197 IF_ADDR_WUNLOCK(ifp); 1198 ifa_free(ifa); 1199 } else 1200 IF_ADDR_WUNLOCK(ifp); 1201 } 1202 1203 rt_flushifroutes(ifp); 1204 1205 #ifdef VIMAGE 1206 finish_vnet_shutdown: 1207 #endif 1208 /* 1209 * We cannot hold the lock over dom_ifdetach calls as they might 1210 * sleep, for example trying to drain a callout, thus open up the 1211 * theoretical race with re-attaching. 1212 */ 1213 IF_AFDATA_LOCK(ifp); 1214 i = ifp->if_afdata_initialized; 1215 ifp->if_afdata_initialized = 0; 1216 IF_AFDATA_UNLOCK(ifp); 1217 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1218 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1219 (*dp->dom_ifdetach)(ifp, 1220 ifp->if_afdata[dp->dom_family]); 1221 ifp->if_afdata[dp->dom_family] = NULL; 1222 } 1223 } 1224 1225 return (0); 1226 } 1227 1228 #ifdef VIMAGE 1229 /* 1230 * if_vmove() performs a limited version of if_detach() in current 1231 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1232 * An attempt is made to shrink if_index in current vnet, find an 1233 * unused if_index in target vnet and calls if_grow() if necessary, 1234 * and finally find an unused if_xname for the target vnet. 1235 */ 1236 static void 1237 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1238 { 1239 struct if_clone *ifc; 1240 u_int bif_dlt, bif_hdrlen; 1241 void *old; 1242 int rc; 1243 1244 /* 1245 * if_detach_internal() will call the eventhandler to notify 1246 * interface departure. That will detach if_bpf. We need to 1247 * safe the dlt and hdrlen so we can re-attach it later. 1248 */ 1249 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1250 1251 /* 1252 * Detach from current vnet, but preserve LLADDR info, do not 1253 * mark as dead etc. so that the ifnet can be reattached later. 1254 * If we cannot find it, we lost the race to someone else. 1255 */ 1256 rc = if_detach_internal(ifp, 1, &ifc); 1257 if (rc != 0) 1258 return; 1259 1260 /* 1261 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1262 * the if_index for that vnet if possible. 1263 * 1264 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1265 * or we'd lock on one vnet and unlock on another. 1266 */ 1267 IFNET_WLOCK(); 1268 ifindex_free_locked(ifp->if_index); 1269 IFNET_WUNLOCK(); 1270 1271 /* 1272 * Perform interface-specific reassignment tasks, if provided by 1273 * the driver. 1274 */ 1275 if (ifp->if_reassign != NULL) 1276 ifp->if_reassign(ifp, new_vnet, NULL); 1277 1278 /* 1279 * Switch to the context of the target vnet. 1280 */ 1281 CURVNET_SET_QUIET(new_vnet); 1282 restart: 1283 IFNET_WLOCK(); 1284 ifp->if_index = ifindex_alloc(&old); 1285 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1286 IFNET_WUNLOCK(); 1287 epoch_wait_preempt(net_epoch_preempt); 1288 free(old, M_IFNET); 1289 goto restart; 1290 } 1291 ifnet_setbyindex(ifp->if_index, ifp); 1292 IFNET_WUNLOCK(); 1293 1294 if_attach_internal(ifp, 1, ifc); 1295 1296 if (ifp->if_bpf == NULL) 1297 bpfattach(ifp, bif_dlt, bif_hdrlen); 1298 1299 CURVNET_RESTORE(); 1300 } 1301 1302 /* 1303 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1304 */ 1305 static int 1306 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1307 { 1308 struct prison *pr; 1309 struct ifnet *difp; 1310 int shutdown; 1311 1312 /* Try to find the prison within our visibility. */ 1313 sx_slock(&allprison_lock); 1314 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1315 sx_sunlock(&allprison_lock); 1316 if (pr == NULL) 1317 return (ENXIO); 1318 prison_hold_locked(pr); 1319 mtx_unlock(&pr->pr_mtx); 1320 1321 /* Do not try to move the iface from and to the same prison. */ 1322 if (pr->pr_vnet == ifp->if_vnet) { 1323 prison_free(pr); 1324 return (EEXIST); 1325 } 1326 1327 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1328 /* XXX Lock interfaces to avoid races. */ 1329 CURVNET_SET_QUIET(pr->pr_vnet); 1330 difp = ifunit(ifname); 1331 if (difp != NULL) { 1332 CURVNET_RESTORE(); 1333 prison_free(pr); 1334 return (EEXIST); 1335 } 1336 1337 /* Make sure the VNET is stable. */ 1338 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1339 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1340 if (shutdown) { 1341 CURVNET_RESTORE(); 1342 prison_free(pr); 1343 return (EBUSY); 1344 } 1345 CURVNET_RESTORE(); 1346 1347 /* Move the interface into the child jail/vnet. */ 1348 if_vmove(ifp, pr->pr_vnet); 1349 1350 /* Report the new if_xname back to the userland. */ 1351 sprintf(ifname, "%s", ifp->if_xname); 1352 1353 prison_free(pr); 1354 return (0); 1355 } 1356 1357 static int 1358 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1359 { 1360 struct prison *pr; 1361 struct vnet *vnet_dst; 1362 struct ifnet *ifp; 1363 int shutdown; 1364 1365 /* Try to find the prison within our visibility. */ 1366 sx_slock(&allprison_lock); 1367 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1368 sx_sunlock(&allprison_lock); 1369 if (pr == NULL) 1370 return (ENXIO); 1371 prison_hold_locked(pr); 1372 mtx_unlock(&pr->pr_mtx); 1373 1374 /* Make sure the named iface exists in the source prison/vnet. */ 1375 CURVNET_SET(pr->pr_vnet); 1376 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1377 if (ifp == NULL) { 1378 CURVNET_RESTORE(); 1379 prison_free(pr); 1380 return (ENXIO); 1381 } 1382 1383 /* Do not try to move the iface from and to the same prison. */ 1384 vnet_dst = TD_TO_VNET(td); 1385 if (vnet_dst == ifp->if_vnet) { 1386 CURVNET_RESTORE(); 1387 prison_free(pr); 1388 return (EEXIST); 1389 } 1390 1391 /* Make sure the VNET is stable. */ 1392 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1393 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1394 if (shutdown) { 1395 CURVNET_RESTORE(); 1396 prison_free(pr); 1397 return (EBUSY); 1398 } 1399 1400 /* Get interface back from child jail/vnet. */ 1401 if_vmove(ifp, vnet_dst); 1402 CURVNET_RESTORE(); 1403 1404 /* Report the new if_xname back to the userland. */ 1405 sprintf(ifname, "%s", ifp->if_xname); 1406 1407 prison_free(pr); 1408 return (0); 1409 } 1410 #endif /* VIMAGE */ 1411 1412 /* 1413 * Add a group to an interface 1414 */ 1415 int 1416 if_addgroup(struct ifnet *ifp, const char *groupname) 1417 { 1418 struct ifg_list *ifgl; 1419 struct ifg_group *ifg = NULL; 1420 struct ifg_member *ifgm; 1421 int new = 0; 1422 1423 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1424 groupname[strlen(groupname) - 1] <= '9') 1425 return (EINVAL); 1426 1427 IFNET_WLOCK(); 1428 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1429 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1430 IFNET_WUNLOCK(); 1431 return (EEXIST); 1432 } 1433 1434 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1435 M_NOWAIT)) == NULL) { 1436 IFNET_WUNLOCK(); 1437 return (ENOMEM); 1438 } 1439 1440 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1441 M_TEMP, M_NOWAIT)) == NULL) { 1442 free(ifgl, M_TEMP); 1443 IFNET_WUNLOCK(); 1444 return (ENOMEM); 1445 } 1446 1447 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1448 if (!strcmp(ifg->ifg_group, groupname)) 1449 break; 1450 1451 if (ifg == NULL) { 1452 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1453 M_TEMP, M_NOWAIT)) == NULL) { 1454 free(ifgl, M_TEMP); 1455 free(ifgm, M_TEMP); 1456 IFNET_WUNLOCK(); 1457 return (ENOMEM); 1458 } 1459 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1460 ifg->ifg_refcnt = 0; 1461 CK_STAILQ_INIT(&ifg->ifg_members); 1462 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1463 new = 1; 1464 } 1465 1466 ifg->ifg_refcnt++; 1467 ifgl->ifgl_group = ifg; 1468 ifgm->ifgm_ifp = ifp; 1469 1470 IF_ADDR_WLOCK(ifp); 1471 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1472 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1473 IF_ADDR_WUNLOCK(ifp); 1474 1475 IFNET_WUNLOCK(); 1476 1477 if (new) 1478 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1479 EVENTHANDLER_INVOKE(group_change_event, groupname); 1480 1481 return (0); 1482 } 1483 1484 /* 1485 * Remove a group from an interface 1486 */ 1487 int 1488 if_delgroup(struct ifnet *ifp, const char *groupname) 1489 { 1490 struct ifg_list *ifgl; 1491 struct ifg_member *ifgm; 1492 int freeifgl; 1493 1494 IFNET_WLOCK(); 1495 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1496 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1497 break; 1498 if (ifgl == NULL) { 1499 IFNET_WUNLOCK(); 1500 return (ENOENT); 1501 } 1502 1503 freeifgl = 0; 1504 IF_ADDR_WLOCK(ifp); 1505 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1506 IF_ADDR_WUNLOCK(ifp); 1507 1508 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1509 if (ifgm->ifgm_ifp == ifp) 1510 break; 1511 1512 if (ifgm != NULL) 1513 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1514 1515 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1516 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1517 freeifgl = 1; 1518 } 1519 IFNET_WUNLOCK(); 1520 1521 epoch_wait_preempt(net_epoch_preempt); 1522 if (freeifgl) { 1523 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1524 free(ifgl->ifgl_group, M_TEMP); 1525 } 1526 free(ifgm, M_TEMP); 1527 free(ifgl, M_TEMP); 1528 1529 EVENTHANDLER_INVOKE(group_change_event, groupname); 1530 1531 return (0); 1532 } 1533 1534 /* 1535 * Remove an interface from all groups 1536 */ 1537 static void 1538 if_delgroups(struct ifnet *ifp) 1539 { 1540 struct ifg_list *ifgl; 1541 struct ifg_member *ifgm; 1542 char groupname[IFNAMSIZ]; 1543 int ifglfree; 1544 1545 IFNET_WLOCK(); 1546 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1547 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1548 1549 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1550 1551 IF_ADDR_WLOCK(ifp); 1552 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1553 IF_ADDR_WUNLOCK(ifp); 1554 1555 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1556 if (ifgm->ifgm_ifp == ifp) 1557 break; 1558 1559 if (ifgm != NULL) 1560 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1561 ifgm_next); 1562 ifglfree = 0; 1563 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1564 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1565 ifglfree = 1; 1566 } 1567 1568 IFNET_WUNLOCK(); 1569 epoch_wait_preempt(net_epoch_preempt); 1570 free(ifgm, M_TEMP); 1571 if (ifglfree) { 1572 EVENTHANDLER_INVOKE(group_detach_event, 1573 ifgl->ifgl_group); 1574 free(ifgl->ifgl_group, M_TEMP); 1575 } 1576 EVENTHANDLER_INVOKE(group_change_event, groupname); 1577 1578 IFNET_WLOCK(); 1579 } 1580 IFNET_WUNLOCK(); 1581 } 1582 1583 static char * 1584 ifgr_group_get(void *ifgrp) 1585 { 1586 union ifgroupreq_union *ifgrup; 1587 1588 ifgrup = ifgrp; 1589 #ifdef COMPAT_FREEBSD32 1590 if (SV_CURPROC_FLAG(SV_ILP32)) 1591 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1592 #endif 1593 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1594 } 1595 1596 static struct ifg_req * 1597 ifgr_groups_get(void *ifgrp) 1598 { 1599 union ifgroupreq_union *ifgrup; 1600 1601 ifgrup = ifgrp; 1602 #ifdef COMPAT_FREEBSD32 1603 if (SV_CURPROC_FLAG(SV_ILP32)) 1604 return ((struct ifg_req *)(uintptr_t) 1605 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1606 #endif 1607 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1608 } 1609 1610 /* 1611 * Stores all groups from an interface in memory pointed to by ifgr. 1612 */ 1613 static int 1614 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1615 { 1616 struct epoch_tracker et; 1617 int len, error; 1618 struct ifg_list *ifgl; 1619 struct ifg_req ifgrq, *ifgp; 1620 1621 if (ifgr->ifgr_len == 0) { 1622 NET_EPOCH_ENTER(et); 1623 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1624 ifgr->ifgr_len += sizeof(struct ifg_req); 1625 NET_EPOCH_EXIT(et); 1626 return (0); 1627 } 1628 1629 len = ifgr->ifgr_len; 1630 ifgp = ifgr_groups_get(ifgr); 1631 /* XXX: wire */ 1632 NET_EPOCH_ENTER(et); 1633 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1634 if (len < sizeof(ifgrq)) { 1635 NET_EPOCH_EXIT(et); 1636 return (EINVAL); 1637 } 1638 bzero(&ifgrq, sizeof ifgrq); 1639 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1640 sizeof(ifgrq.ifgrq_group)); 1641 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1642 NET_EPOCH_EXIT(et); 1643 return (error); 1644 } 1645 len -= sizeof(ifgrq); 1646 ifgp++; 1647 } 1648 NET_EPOCH_EXIT(et); 1649 1650 return (0); 1651 } 1652 1653 /* 1654 * Stores all members of a group in memory pointed to by igfr 1655 */ 1656 static int 1657 if_getgroupmembers(struct ifgroupreq *ifgr) 1658 { 1659 struct ifg_group *ifg; 1660 struct ifg_member *ifgm; 1661 struct ifg_req ifgrq, *ifgp; 1662 int len, error; 1663 1664 IFNET_RLOCK(); 1665 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1666 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1667 break; 1668 if (ifg == NULL) { 1669 IFNET_RUNLOCK(); 1670 return (ENOENT); 1671 } 1672 1673 if (ifgr->ifgr_len == 0) { 1674 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1675 ifgr->ifgr_len += sizeof(ifgrq); 1676 IFNET_RUNLOCK(); 1677 return (0); 1678 } 1679 1680 len = ifgr->ifgr_len; 1681 ifgp = ifgr_groups_get(ifgr); 1682 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1683 if (len < sizeof(ifgrq)) { 1684 IFNET_RUNLOCK(); 1685 return (EINVAL); 1686 } 1687 bzero(&ifgrq, sizeof ifgrq); 1688 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1689 sizeof(ifgrq.ifgrq_member)); 1690 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1691 IFNET_RUNLOCK(); 1692 return (error); 1693 } 1694 len -= sizeof(ifgrq); 1695 ifgp++; 1696 } 1697 IFNET_RUNLOCK(); 1698 1699 return (0); 1700 } 1701 1702 /* 1703 * Return counter values from counter(9)s stored in ifnet. 1704 */ 1705 uint64_t 1706 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1707 { 1708 1709 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1710 1711 return (counter_u64_fetch(ifp->if_counters[cnt])); 1712 } 1713 1714 /* 1715 * Increase an ifnet counter. Usually used for counters shared 1716 * between the stack and a driver, but function supports them all. 1717 */ 1718 void 1719 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1720 { 1721 1722 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1723 1724 counter_u64_add(ifp->if_counters[cnt], inc); 1725 } 1726 1727 /* 1728 * Copy data from ifnet to userland API structure if_data. 1729 */ 1730 void 1731 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1732 { 1733 1734 ifd->ifi_type = ifp->if_type; 1735 ifd->ifi_physical = 0; 1736 ifd->ifi_addrlen = ifp->if_addrlen; 1737 ifd->ifi_hdrlen = ifp->if_hdrlen; 1738 ifd->ifi_link_state = ifp->if_link_state; 1739 ifd->ifi_vhid = 0; 1740 ifd->ifi_datalen = sizeof(struct if_data); 1741 ifd->ifi_mtu = ifp->if_mtu; 1742 ifd->ifi_metric = ifp->if_metric; 1743 ifd->ifi_baudrate = ifp->if_baudrate; 1744 ifd->ifi_hwassist = ifp->if_hwassist; 1745 ifd->ifi_epoch = ifp->if_epoch; 1746 ifd->ifi_lastchange = ifp->if_lastchange; 1747 1748 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1749 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1750 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1751 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1752 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1753 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1754 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1755 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1756 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1757 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1758 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1759 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1760 } 1761 1762 /* 1763 * Wrapper functions for struct ifnet address list locking macros. These are 1764 * used by kernel modules to avoid encoding programming interface or binary 1765 * interface assumptions that may be violated when kernel-internal locking 1766 * approaches change. 1767 */ 1768 void 1769 if_addr_rlock(struct ifnet *ifp) 1770 { 1771 1772 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1773 } 1774 1775 void 1776 if_addr_runlock(struct ifnet *ifp) 1777 { 1778 1779 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1780 } 1781 1782 void 1783 if_maddr_rlock(if_t ifp) 1784 { 1785 1786 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1787 } 1788 1789 void 1790 if_maddr_runlock(if_t ifp) 1791 { 1792 1793 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1794 } 1795 1796 /* 1797 * Initialization, destruction and refcounting functions for ifaddrs. 1798 */ 1799 struct ifaddr * 1800 ifa_alloc(size_t size, int flags) 1801 { 1802 struct ifaddr *ifa; 1803 1804 KASSERT(size >= sizeof(struct ifaddr), 1805 ("%s: invalid size %zu", __func__, size)); 1806 1807 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1808 if (ifa == NULL) 1809 return (NULL); 1810 1811 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1812 goto fail; 1813 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1814 goto fail; 1815 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1816 goto fail; 1817 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1818 goto fail; 1819 1820 refcount_init(&ifa->ifa_refcnt, 1); 1821 1822 return (ifa); 1823 1824 fail: 1825 /* free(NULL) is okay */ 1826 counter_u64_free(ifa->ifa_opackets); 1827 counter_u64_free(ifa->ifa_ipackets); 1828 counter_u64_free(ifa->ifa_obytes); 1829 counter_u64_free(ifa->ifa_ibytes); 1830 free(ifa, M_IFADDR); 1831 1832 return (NULL); 1833 } 1834 1835 void 1836 ifa_ref(struct ifaddr *ifa) 1837 { 1838 1839 refcount_acquire(&ifa->ifa_refcnt); 1840 } 1841 1842 static void 1843 ifa_destroy(epoch_context_t ctx) 1844 { 1845 struct ifaddr *ifa; 1846 1847 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1848 counter_u64_free(ifa->ifa_opackets); 1849 counter_u64_free(ifa->ifa_ipackets); 1850 counter_u64_free(ifa->ifa_obytes); 1851 counter_u64_free(ifa->ifa_ibytes); 1852 free(ifa, M_IFADDR); 1853 } 1854 1855 void 1856 ifa_free(struct ifaddr *ifa) 1857 { 1858 1859 if (refcount_release(&ifa->ifa_refcnt)) 1860 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1861 } 1862 1863 1864 static int 1865 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1866 struct sockaddr *ia) 1867 { 1868 int error; 1869 struct rt_addrinfo info; 1870 struct sockaddr_dl null_sdl; 1871 struct ifnet *ifp; 1872 1873 ifp = ifa->ifa_ifp; 1874 1875 bzero(&info, sizeof(info)); 1876 if (cmd != RTM_DELETE) 1877 info.rti_ifp = V_loif; 1878 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1879 info.rti_info[RTAX_DST] = ia; 1880 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1881 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1882 1883 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1884 1885 if (error != 0 && 1886 !(cmd == RTM_ADD && error == EEXIST) && 1887 !(cmd == RTM_DELETE && error == ENOENT)) 1888 if_printf(ifp, "%s failed: %d\n", otype, error); 1889 1890 return (error); 1891 } 1892 1893 int 1894 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1895 { 1896 1897 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1898 } 1899 1900 int 1901 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1902 { 1903 1904 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1905 } 1906 1907 int 1908 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1909 { 1910 1911 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1912 } 1913 1914 /* 1915 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1916 * structs used to represent other address families, it is necessary 1917 * to perform a different comparison. 1918 */ 1919 1920 #define sa_dl_equal(a1, a2) \ 1921 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1922 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1923 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1924 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1925 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1926 1927 /* 1928 * Locate an interface based on a complete address. 1929 */ 1930 /*ARGSUSED*/ 1931 struct ifaddr * 1932 ifa_ifwithaddr(const struct sockaddr *addr) 1933 { 1934 struct ifnet *ifp; 1935 struct ifaddr *ifa; 1936 1937 MPASS(in_epoch(net_epoch_preempt)); 1938 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1939 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1940 if (ifa->ifa_addr->sa_family != addr->sa_family) 1941 continue; 1942 if (sa_equal(addr, ifa->ifa_addr)) { 1943 goto done; 1944 } 1945 /* IP6 doesn't have broadcast */ 1946 if ((ifp->if_flags & IFF_BROADCAST) && 1947 ifa->ifa_broadaddr && 1948 ifa->ifa_broadaddr->sa_len != 0 && 1949 sa_equal(ifa->ifa_broadaddr, addr)) { 1950 goto done; 1951 } 1952 } 1953 } 1954 ifa = NULL; 1955 done: 1956 return (ifa); 1957 } 1958 1959 int 1960 ifa_ifwithaddr_check(const struct sockaddr *addr) 1961 { 1962 struct epoch_tracker et; 1963 int rc; 1964 1965 NET_EPOCH_ENTER(et); 1966 rc = (ifa_ifwithaddr(addr) != NULL); 1967 NET_EPOCH_EXIT(et); 1968 return (rc); 1969 } 1970 1971 /* 1972 * Locate an interface based on the broadcast address. 1973 */ 1974 /* ARGSUSED */ 1975 struct ifaddr * 1976 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1977 { 1978 struct ifnet *ifp; 1979 struct ifaddr *ifa; 1980 1981 MPASS(in_epoch(net_epoch_preempt)); 1982 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1983 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1984 continue; 1985 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1986 if (ifa->ifa_addr->sa_family != addr->sa_family) 1987 continue; 1988 if ((ifp->if_flags & IFF_BROADCAST) && 1989 ifa->ifa_broadaddr && 1990 ifa->ifa_broadaddr->sa_len != 0 && 1991 sa_equal(ifa->ifa_broadaddr, addr)) { 1992 goto done; 1993 } 1994 } 1995 } 1996 ifa = NULL; 1997 done: 1998 return (ifa); 1999 } 2000 2001 /* 2002 * Locate the point to point interface with a given destination address. 2003 */ 2004 /*ARGSUSED*/ 2005 struct ifaddr * 2006 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2007 { 2008 struct ifnet *ifp; 2009 struct ifaddr *ifa; 2010 2011 MPASS(in_epoch(net_epoch_preempt)); 2012 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2013 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2014 continue; 2015 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2016 continue; 2017 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2018 if (ifa->ifa_addr->sa_family != addr->sa_family) 2019 continue; 2020 if (ifa->ifa_dstaddr != NULL && 2021 sa_equal(addr, ifa->ifa_dstaddr)) { 2022 goto done; 2023 } 2024 } 2025 } 2026 ifa = NULL; 2027 done: 2028 return (ifa); 2029 } 2030 2031 /* 2032 * Find an interface on a specific network. If many, choice 2033 * is most specific found. 2034 */ 2035 struct ifaddr * 2036 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2037 { 2038 struct ifnet *ifp; 2039 struct ifaddr *ifa; 2040 struct ifaddr *ifa_maybe = NULL; 2041 u_int af = addr->sa_family; 2042 const char *addr_data = addr->sa_data, *cplim; 2043 2044 MPASS(in_epoch(net_epoch_preempt)); 2045 /* 2046 * AF_LINK addresses can be looked up directly by their index number, 2047 * so do that if we can. 2048 */ 2049 if (af == AF_LINK) { 2050 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2051 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2052 return (ifaddr_byindex(sdl->sdl_index)); 2053 } 2054 2055 /* 2056 * Scan though each interface, looking for ones that have addresses 2057 * in this address family and the requested fib. 2058 */ 2059 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2060 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2061 continue; 2062 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2063 const char *cp, *cp2, *cp3; 2064 2065 if (ifa->ifa_addr->sa_family != af) 2066 next: continue; 2067 if (af == AF_INET && 2068 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2069 /* 2070 * This is a bit broken as it doesn't 2071 * take into account that the remote end may 2072 * be a single node in the network we are 2073 * looking for. 2074 * The trouble is that we don't know the 2075 * netmask for the remote end. 2076 */ 2077 if (ifa->ifa_dstaddr != NULL && 2078 sa_equal(addr, ifa->ifa_dstaddr)) { 2079 goto done; 2080 } 2081 } else { 2082 /* 2083 * Scan all the bits in the ifa's address. 2084 * If a bit dissagrees with what we are 2085 * looking for, mask it with the netmask 2086 * to see if it really matters. 2087 * (A byte at a time) 2088 */ 2089 if (ifa->ifa_netmask == 0) 2090 continue; 2091 cp = addr_data; 2092 cp2 = ifa->ifa_addr->sa_data; 2093 cp3 = ifa->ifa_netmask->sa_data; 2094 cplim = ifa->ifa_netmask->sa_len 2095 + (char *)ifa->ifa_netmask; 2096 while (cp3 < cplim) 2097 if ((*cp++ ^ *cp2++) & *cp3++) 2098 goto next; /* next address! */ 2099 /* 2100 * If the netmask of what we just found 2101 * is more specific than what we had before 2102 * (if we had one), or if the virtual status 2103 * of new prefix is better than of the old one, 2104 * then remember the new one before continuing 2105 * to search for an even better one. 2106 */ 2107 if (ifa_maybe == NULL || 2108 ifa_preferred(ifa_maybe, ifa) || 2109 rn_refines((caddr_t)ifa->ifa_netmask, 2110 (caddr_t)ifa_maybe->ifa_netmask)) { 2111 ifa_maybe = ifa; 2112 } 2113 } 2114 } 2115 } 2116 ifa = ifa_maybe; 2117 ifa_maybe = NULL; 2118 done: 2119 return (ifa); 2120 } 2121 2122 /* 2123 * Find an interface address specific to an interface best matching 2124 * a given address. 2125 */ 2126 struct ifaddr * 2127 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2128 { 2129 struct ifaddr *ifa; 2130 const char *cp, *cp2, *cp3; 2131 char *cplim; 2132 struct ifaddr *ifa_maybe = NULL; 2133 u_int af = addr->sa_family; 2134 2135 if (af >= AF_MAX) 2136 return (NULL); 2137 2138 MPASS(in_epoch(net_epoch_preempt)); 2139 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2140 if (ifa->ifa_addr->sa_family != af) 2141 continue; 2142 if (ifa_maybe == NULL) 2143 ifa_maybe = ifa; 2144 if (ifa->ifa_netmask == 0) { 2145 if (sa_equal(addr, ifa->ifa_addr) || 2146 (ifa->ifa_dstaddr && 2147 sa_equal(addr, ifa->ifa_dstaddr))) 2148 goto done; 2149 continue; 2150 } 2151 if (ifp->if_flags & IFF_POINTOPOINT) { 2152 if (sa_equal(addr, ifa->ifa_dstaddr)) 2153 goto done; 2154 } else { 2155 cp = addr->sa_data; 2156 cp2 = ifa->ifa_addr->sa_data; 2157 cp3 = ifa->ifa_netmask->sa_data; 2158 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2159 for (; cp3 < cplim; cp3++) 2160 if ((*cp++ ^ *cp2++) & *cp3) 2161 break; 2162 if (cp3 == cplim) 2163 goto done; 2164 } 2165 } 2166 ifa = ifa_maybe; 2167 done: 2168 return (ifa); 2169 } 2170 2171 /* 2172 * See whether new ifa is better than current one: 2173 * 1) A non-virtual one is preferred over virtual. 2174 * 2) A virtual in master state preferred over any other state. 2175 * 2176 * Used in several address selecting functions. 2177 */ 2178 int 2179 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2180 { 2181 2182 return (cur->ifa_carp && (!next->ifa_carp || 2183 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2184 } 2185 2186 #include <net/if_llatbl.h> 2187 2188 /* 2189 * Default action when installing a route with a Link Level gateway. 2190 * Lookup an appropriate real ifa to point to. 2191 * This should be moved to /sys/net/link.c eventually. 2192 */ 2193 static void 2194 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 2195 { 2196 struct epoch_tracker et; 2197 struct ifaddr *ifa, *oifa; 2198 struct sockaddr *dst; 2199 struct ifnet *ifp; 2200 2201 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 2202 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_key(rt)) == NULL)) 2203 return; 2204 NET_EPOCH_ENTER(et); 2205 ifa = ifaof_ifpforaddr(dst, ifp); 2206 if (ifa) { 2207 oifa = rt->rt_ifa; 2208 if (oifa != ifa) { 2209 ifa_free(oifa); 2210 ifa_ref(ifa); 2211 } 2212 rt->rt_ifa = ifa; 2213 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2214 ifa->ifa_rtrequest(cmd, rt, info); 2215 } 2216 NET_EPOCH_EXIT(et); 2217 } 2218 2219 struct sockaddr_dl * 2220 link_alloc_sdl(size_t size, int flags) 2221 { 2222 2223 return (malloc(size, M_TEMP, flags)); 2224 } 2225 2226 void 2227 link_free_sdl(struct sockaddr *sa) 2228 { 2229 free(sa, M_TEMP); 2230 } 2231 2232 /* 2233 * Fills in given sdl with interface basic info. 2234 * Returns pointer to filled sdl. 2235 */ 2236 struct sockaddr_dl * 2237 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2238 { 2239 struct sockaddr_dl *sdl; 2240 2241 sdl = (struct sockaddr_dl *)paddr; 2242 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2243 sdl->sdl_len = sizeof(struct sockaddr_dl); 2244 sdl->sdl_family = AF_LINK; 2245 sdl->sdl_index = ifp->if_index; 2246 sdl->sdl_type = iftype; 2247 2248 return (sdl); 2249 } 2250 2251 /* 2252 * Mark an interface down and notify protocols of 2253 * the transition. 2254 */ 2255 static void 2256 if_unroute(struct ifnet *ifp, int flag, int fam) 2257 { 2258 struct ifaddr *ifa; 2259 2260 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2261 2262 ifp->if_flags &= ~flag; 2263 getmicrotime(&ifp->if_lastchange); 2264 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2265 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2266 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2267 ifp->if_qflush(ifp); 2268 2269 if (ifp->if_carp) 2270 (*carp_linkstate_p)(ifp); 2271 rt_ifmsg(ifp); 2272 } 2273 2274 /* 2275 * Mark an interface up and notify protocols of 2276 * the transition. 2277 */ 2278 static void 2279 if_route(struct ifnet *ifp, int flag, int fam) 2280 { 2281 struct ifaddr *ifa; 2282 2283 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2284 2285 ifp->if_flags |= flag; 2286 getmicrotime(&ifp->if_lastchange); 2287 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2288 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2289 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2290 if (ifp->if_carp) 2291 (*carp_linkstate_p)(ifp); 2292 rt_ifmsg(ifp); 2293 #ifdef INET6 2294 in6_if_up(ifp); 2295 #endif 2296 } 2297 2298 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2299 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2300 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2301 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2302 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2303 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2304 int (*vlan_setcookie_p)(struct ifnet *, void *); 2305 void *(*vlan_cookie_p)(struct ifnet *); 2306 2307 /* 2308 * Handle a change in the interface link state. To avoid LORs 2309 * between driver lock and upper layer locks, as well as possible 2310 * recursions, we post event to taskqueue, and all job 2311 * is done in static do_link_state_change(). 2312 */ 2313 void 2314 if_link_state_change(struct ifnet *ifp, int link_state) 2315 { 2316 /* Return if state hasn't changed. */ 2317 if (ifp->if_link_state == link_state) 2318 return; 2319 2320 ifp->if_link_state = link_state; 2321 2322 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2323 } 2324 2325 static void 2326 do_link_state_change(void *arg, int pending) 2327 { 2328 struct ifnet *ifp = (struct ifnet *)arg; 2329 int link_state = ifp->if_link_state; 2330 CURVNET_SET(ifp->if_vnet); 2331 2332 /* Notify that the link state has changed. */ 2333 rt_ifmsg(ifp); 2334 if (ifp->if_vlantrunk != NULL) 2335 (*vlan_link_state_p)(ifp); 2336 2337 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2338 ifp->if_l2com != NULL) 2339 (*ng_ether_link_state_p)(ifp, link_state); 2340 if (ifp->if_carp) 2341 (*carp_linkstate_p)(ifp); 2342 if (ifp->if_bridge) 2343 ifp->if_bridge_linkstate(ifp); 2344 if (ifp->if_lagg) 2345 (*lagg_linkstate_p)(ifp, link_state); 2346 2347 if (IS_DEFAULT_VNET(curvnet)) 2348 devctl_notify("IFNET", ifp->if_xname, 2349 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2350 NULL); 2351 if (pending > 1) 2352 if_printf(ifp, "%d link states coalesced\n", pending); 2353 if (log_link_state_change) 2354 if_printf(ifp, "link state changed to %s\n", 2355 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2356 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2357 CURVNET_RESTORE(); 2358 } 2359 2360 /* 2361 * Mark an interface down and notify protocols of 2362 * the transition. 2363 */ 2364 void 2365 if_down(struct ifnet *ifp) 2366 { 2367 2368 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2369 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2370 } 2371 2372 /* 2373 * Mark an interface up and notify protocols of 2374 * the transition. 2375 */ 2376 void 2377 if_up(struct ifnet *ifp) 2378 { 2379 2380 if_route(ifp, IFF_UP, AF_UNSPEC); 2381 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2382 } 2383 2384 /* 2385 * Flush an interface queue. 2386 */ 2387 void 2388 if_qflush(struct ifnet *ifp) 2389 { 2390 struct mbuf *m, *n; 2391 struct ifaltq *ifq; 2392 2393 ifq = &ifp->if_snd; 2394 IFQ_LOCK(ifq); 2395 #ifdef ALTQ 2396 if (ALTQ_IS_ENABLED(ifq)) 2397 ALTQ_PURGE(ifq); 2398 #endif 2399 n = ifq->ifq_head; 2400 while ((m = n) != NULL) { 2401 n = m->m_nextpkt; 2402 m_freem(m); 2403 } 2404 ifq->ifq_head = 0; 2405 ifq->ifq_tail = 0; 2406 ifq->ifq_len = 0; 2407 IFQ_UNLOCK(ifq); 2408 } 2409 2410 /* 2411 * Map interface name to interface structure pointer, with or without 2412 * returning a reference. 2413 */ 2414 struct ifnet * 2415 ifunit_ref(const char *name) 2416 { 2417 struct epoch_tracker et; 2418 struct ifnet *ifp; 2419 2420 NET_EPOCH_ENTER(et); 2421 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2422 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2423 !(ifp->if_flags & IFF_DYING)) 2424 break; 2425 } 2426 if (ifp != NULL) 2427 if_ref(ifp); 2428 NET_EPOCH_EXIT(et); 2429 return (ifp); 2430 } 2431 2432 struct ifnet * 2433 ifunit(const char *name) 2434 { 2435 struct epoch_tracker et; 2436 struct ifnet *ifp; 2437 2438 NET_EPOCH_ENTER(et); 2439 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2440 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2441 break; 2442 } 2443 NET_EPOCH_EXIT(et); 2444 return (ifp); 2445 } 2446 2447 static void * 2448 ifr_buffer_get_buffer(void *data) 2449 { 2450 union ifreq_union *ifrup; 2451 2452 ifrup = data; 2453 #ifdef COMPAT_FREEBSD32 2454 if (SV_CURPROC_FLAG(SV_ILP32)) 2455 return ((void *)(uintptr_t) 2456 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2457 #endif 2458 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2459 } 2460 2461 static void 2462 ifr_buffer_set_buffer_null(void *data) 2463 { 2464 union ifreq_union *ifrup; 2465 2466 ifrup = data; 2467 #ifdef COMPAT_FREEBSD32 2468 if (SV_CURPROC_FLAG(SV_ILP32)) 2469 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2470 else 2471 #endif 2472 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2473 } 2474 2475 static size_t 2476 ifr_buffer_get_length(void *data) 2477 { 2478 union ifreq_union *ifrup; 2479 2480 ifrup = data; 2481 #ifdef COMPAT_FREEBSD32 2482 if (SV_CURPROC_FLAG(SV_ILP32)) 2483 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2484 #endif 2485 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2486 } 2487 2488 static void 2489 ifr_buffer_set_length(void *data, size_t len) 2490 { 2491 union ifreq_union *ifrup; 2492 2493 ifrup = data; 2494 #ifdef COMPAT_FREEBSD32 2495 if (SV_CURPROC_FLAG(SV_ILP32)) 2496 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2497 else 2498 #endif 2499 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2500 } 2501 2502 void * 2503 ifr_data_get_ptr(void *ifrp) 2504 { 2505 union ifreq_union *ifrup; 2506 2507 ifrup = ifrp; 2508 #ifdef COMPAT_FREEBSD32 2509 if (SV_CURPROC_FLAG(SV_ILP32)) 2510 return ((void *)(uintptr_t) 2511 ifrup->ifr32.ifr_ifru.ifru_data); 2512 #endif 2513 return (ifrup->ifr.ifr_ifru.ifru_data); 2514 } 2515 2516 /* 2517 * Hardware specific interface ioctls. 2518 */ 2519 int 2520 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2521 { 2522 struct ifreq *ifr; 2523 int error = 0, do_ifup = 0; 2524 int new_flags, temp_flags; 2525 size_t namelen, onamelen; 2526 size_t descrlen; 2527 char *descrbuf, *odescrbuf; 2528 char new_name[IFNAMSIZ]; 2529 struct ifaddr *ifa; 2530 struct sockaddr_dl *sdl; 2531 2532 ifr = (struct ifreq *)data; 2533 switch (cmd) { 2534 case SIOCGIFINDEX: 2535 ifr->ifr_index = ifp->if_index; 2536 break; 2537 2538 case SIOCGIFFLAGS: 2539 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2540 ifr->ifr_flags = temp_flags & 0xffff; 2541 ifr->ifr_flagshigh = temp_flags >> 16; 2542 break; 2543 2544 case SIOCGIFCAP: 2545 ifr->ifr_reqcap = ifp->if_capabilities; 2546 ifr->ifr_curcap = ifp->if_capenable; 2547 break; 2548 2549 #ifdef MAC 2550 case SIOCGIFMAC: 2551 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2552 break; 2553 #endif 2554 2555 case SIOCGIFMETRIC: 2556 ifr->ifr_metric = ifp->if_metric; 2557 break; 2558 2559 case SIOCGIFMTU: 2560 ifr->ifr_mtu = ifp->if_mtu; 2561 break; 2562 2563 case SIOCGIFPHYS: 2564 /* XXXGL: did this ever worked? */ 2565 ifr->ifr_phys = 0; 2566 break; 2567 2568 case SIOCGIFDESCR: 2569 error = 0; 2570 sx_slock(&ifdescr_sx); 2571 if (ifp->if_description == NULL) 2572 error = ENOMSG; 2573 else { 2574 /* space for terminating nul */ 2575 descrlen = strlen(ifp->if_description) + 1; 2576 if (ifr_buffer_get_length(ifr) < descrlen) 2577 ifr_buffer_set_buffer_null(ifr); 2578 else 2579 error = copyout(ifp->if_description, 2580 ifr_buffer_get_buffer(ifr), descrlen); 2581 ifr_buffer_set_length(ifr, descrlen); 2582 } 2583 sx_sunlock(&ifdescr_sx); 2584 break; 2585 2586 case SIOCSIFDESCR: 2587 error = priv_check(td, PRIV_NET_SETIFDESCR); 2588 if (error) 2589 return (error); 2590 2591 /* 2592 * Copy only (length-1) bytes to make sure that 2593 * if_description is always nul terminated. The 2594 * length parameter is supposed to count the 2595 * terminating nul in. 2596 */ 2597 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2598 return (ENAMETOOLONG); 2599 else if (ifr_buffer_get_length(ifr) == 0) 2600 descrbuf = NULL; 2601 else { 2602 descrbuf = malloc(ifr_buffer_get_length(ifr), 2603 M_IFDESCR, M_WAITOK | M_ZERO); 2604 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2605 ifr_buffer_get_length(ifr) - 1); 2606 if (error) { 2607 free(descrbuf, M_IFDESCR); 2608 break; 2609 } 2610 } 2611 2612 sx_xlock(&ifdescr_sx); 2613 odescrbuf = ifp->if_description; 2614 ifp->if_description = descrbuf; 2615 sx_xunlock(&ifdescr_sx); 2616 2617 getmicrotime(&ifp->if_lastchange); 2618 free(odescrbuf, M_IFDESCR); 2619 break; 2620 2621 case SIOCGIFFIB: 2622 ifr->ifr_fib = ifp->if_fib; 2623 break; 2624 2625 case SIOCSIFFIB: 2626 error = priv_check(td, PRIV_NET_SETIFFIB); 2627 if (error) 2628 return (error); 2629 if (ifr->ifr_fib >= rt_numfibs) 2630 return (EINVAL); 2631 2632 ifp->if_fib = ifr->ifr_fib; 2633 break; 2634 2635 case SIOCSIFFLAGS: 2636 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2637 if (error) 2638 return (error); 2639 /* 2640 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2641 * check, so we don't need special handling here yet. 2642 */ 2643 new_flags = (ifr->ifr_flags & 0xffff) | 2644 (ifr->ifr_flagshigh << 16); 2645 if (ifp->if_flags & IFF_UP && 2646 (new_flags & IFF_UP) == 0) { 2647 if_down(ifp); 2648 } else if (new_flags & IFF_UP && 2649 (ifp->if_flags & IFF_UP) == 0) { 2650 do_ifup = 1; 2651 } 2652 /* See if permanently promiscuous mode bit is about to flip */ 2653 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2654 if (new_flags & IFF_PPROMISC) 2655 ifp->if_flags |= IFF_PROMISC; 2656 else if (ifp->if_pcount == 0) 2657 ifp->if_flags &= ~IFF_PROMISC; 2658 if (log_promisc_mode_change) 2659 if_printf(ifp, "permanently promiscuous mode %s\n", 2660 ((new_flags & IFF_PPROMISC) ? 2661 "enabled" : "disabled")); 2662 } 2663 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2664 (new_flags &~ IFF_CANTCHANGE); 2665 if (ifp->if_ioctl) { 2666 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2667 } 2668 if (do_ifup) 2669 if_up(ifp); 2670 getmicrotime(&ifp->if_lastchange); 2671 break; 2672 2673 case SIOCSIFCAP: 2674 error = priv_check(td, PRIV_NET_SETIFCAP); 2675 if (error) 2676 return (error); 2677 if (ifp->if_ioctl == NULL) 2678 return (EOPNOTSUPP); 2679 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2680 return (EINVAL); 2681 error = (*ifp->if_ioctl)(ifp, cmd, data); 2682 if (error == 0) 2683 getmicrotime(&ifp->if_lastchange); 2684 break; 2685 2686 #ifdef MAC 2687 case SIOCSIFMAC: 2688 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2689 break; 2690 #endif 2691 2692 case SIOCSIFNAME: 2693 error = priv_check(td, PRIV_NET_SETIFNAME); 2694 if (error) 2695 return (error); 2696 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2697 NULL); 2698 if (error != 0) 2699 return (error); 2700 if (new_name[0] == '\0') 2701 return (EINVAL); 2702 if (new_name[IFNAMSIZ-1] != '\0') { 2703 new_name[IFNAMSIZ-1] = '\0'; 2704 if (strlen(new_name) == IFNAMSIZ-1) 2705 return (EINVAL); 2706 } 2707 if (ifunit(new_name) != NULL) 2708 return (EEXIST); 2709 2710 /* 2711 * XXX: Locking. Nothing else seems to lock if_flags, 2712 * and there are numerous other races with the 2713 * ifunit() checks not being atomic with namespace 2714 * changes (renames, vmoves, if_attach, etc). 2715 */ 2716 ifp->if_flags |= IFF_RENAMING; 2717 2718 /* Announce the departure of the interface. */ 2719 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2720 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2721 2722 if_printf(ifp, "changing name to '%s'\n", new_name); 2723 2724 IF_ADDR_WLOCK(ifp); 2725 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2726 ifa = ifp->if_addr; 2727 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2728 namelen = strlen(new_name); 2729 onamelen = sdl->sdl_nlen; 2730 /* 2731 * Move the address if needed. This is safe because we 2732 * allocate space for a name of length IFNAMSIZ when we 2733 * create this in if_attach(). 2734 */ 2735 if (namelen != onamelen) { 2736 bcopy(sdl->sdl_data + onamelen, 2737 sdl->sdl_data + namelen, sdl->sdl_alen); 2738 } 2739 bcopy(new_name, sdl->sdl_data, namelen); 2740 sdl->sdl_nlen = namelen; 2741 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2742 bzero(sdl->sdl_data, onamelen); 2743 while (namelen != 0) 2744 sdl->sdl_data[--namelen] = 0xff; 2745 IF_ADDR_WUNLOCK(ifp); 2746 2747 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2748 /* Announce the return of the interface. */ 2749 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2750 2751 ifp->if_flags &= ~IFF_RENAMING; 2752 break; 2753 2754 #ifdef VIMAGE 2755 case SIOCSIFVNET: 2756 error = priv_check(td, PRIV_NET_SETIFVNET); 2757 if (error) 2758 return (error); 2759 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2760 break; 2761 #endif 2762 2763 case SIOCSIFMETRIC: 2764 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2765 if (error) 2766 return (error); 2767 ifp->if_metric = ifr->ifr_metric; 2768 getmicrotime(&ifp->if_lastchange); 2769 break; 2770 2771 case SIOCSIFPHYS: 2772 error = priv_check(td, PRIV_NET_SETIFPHYS); 2773 if (error) 2774 return (error); 2775 if (ifp->if_ioctl == NULL) 2776 return (EOPNOTSUPP); 2777 error = (*ifp->if_ioctl)(ifp, cmd, data); 2778 if (error == 0) 2779 getmicrotime(&ifp->if_lastchange); 2780 break; 2781 2782 case SIOCSIFMTU: 2783 { 2784 u_long oldmtu = ifp->if_mtu; 2785 2786 error = priv_check(td, PRIV_NET_SETIFMTU); 2787 if (error) 2788 return (error); 2789 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2790 return (EINVAL); 2791 if (ifp->if_ioctl == NULL) 2792 return (EOPNOTSUPP); 2793 error = (*ifp->if_ioctl)(ifp, cmd, data); 2794 if (error == 0) { 2795 getmicrotime(&ifp->if_lastchange); 2796 rt_ifmsg(ifp); 2797 #ifdef INET 2798 NETDUMP_REINIT(ifp); 2799 #endif 2800 } 2801 /* 2802 * If the link MTU changed, do network layer specific procedure. 2803 */ 2804 if (ifp->if_mtu != oldmtu) { 2805 #ifdef INET6 2806 nd6_setmtu(ifp); 2807 #endif 2808 rt_updatemtu(ifp); 2809 } 2810 break; 2811 } 2812 2813 case SIOCADDMULTI: 2814 case SIOCDELMULTI: 2815 if (cmd == SIOCADDMULTI) 2816 error = priv_check(td, PRIV_NET_ADDMULTI); 2817 else 2818 error = priv_check(td, PRIV_NET_DELMULTI); 2819 if (error) 2820 return (error); 2821 2822 /* Don't allow group membership on non-multicast interfaces. */ 2823 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2824 return (EOPNOTSUPP); 2825 2826 /* Don't let users screw up protocols' entries. */ 2827 if (ifr->ifr_addr.sa_family != AF_LINK) 2828 return (EINVAL); 2829 2830 if (cmd == SIOCADDMULTI) { 2831 struct epoch_tracker et; 2832 struct ifmultiaddr *ifma; 2833 2834 /* 2835 * Userland is only permitted to join groups once 2836 * via the if_addmulti() KPI, because it cannot hold 2837 * struct ifmultiaddr * between calls. It may also 2838 * lose a race while we check if the membership 2839 * already exists. 2840 */ 2841 NET_EPOCH_ENTER(et); 2842 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2843 NET_EPOCH_EXIT(et); 2844 if (ifma != NULL) 2845 error = EADDRINUSE; 2846 else 2847 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2848 } else { 2849 error = if_delmulti(ifp, &ifr->ifr_addr); 2850 } 2851 if (error == 0) 2852 getmicrotime(&ifp->if_lastchange); 2853 break; 2854 2855 case SIOCSIFPHYADDR: 2856 case SIOCDIFPHYADDR: 2857 #ifdef INET6 2858 case SIOCSIFPHYADDR_IN6: 2859 #endif 2860 case SIOCSIFMEDIA: 2861 case SIOCSIFGENERIC: 2862 error = priv_check(td, PRIV_NET_HWIOCTL); 2863 if (error) 2864 return (error); 2865 if (ifp->if_ioctl == NULL) 2866 return (EOPNOTSUPP); 2867 error = (*ifp->if_ioctl)(ifp, cmd, data); 2868 if (error == 0) 2869 getmicrotime(&ifp->if_lastchange); 2870 break; 2871 2872 case SIOCGIFSTATUS: 2873 case SIOCGIFPSRCADDR: 2874 case SIOCGIFPDSTADDR: 2875 case SIOCGIFMEDIA: 2876 case SIOCGIFXMEDIA: 2877 case SIOCGIFGENERIC: 2878 case SIOCGIFRSSKEY: 2879 case SIOCGIFRSSHASH: 2880 if (ifp->if_ioctl == NULL) 2881 return (EOPNOTSUPP); 2882 error = (*ifp->if_ioctl)(ifp, cmd, data); 2883 break; 2884 2885 case SIOCSIFLLADDR: 2886 error = priv_check(td, PRIV_NET_SETLLADDR); 2887 if (error) 2888 return (error); 2889 error = if_setlladdr(ifp, 2890 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2891 break; 2892 2893 case SIOCGHWADDR: 2894 error = if_gethwaddr(ifp, ifr); 2895 break; 2896 2897 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2898 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2899 if (error) 2900 return (error); 2901 if ((error = if_addgroup(ifp, 2902 ifgr_group_get((struct ifgroupreq *)data)))) 2903 return (error); 2904 break; 2905 2906 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2907 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2908 return (error); 2909 break; 2910 2911 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2912 error = priv_check(td, PRIV_NET_DELIFGROUP); 2913 if (error) 2914 return (error); 2915 if ((error = if_delgroup(ifp, 2916 ifgr_group_get((struct ifgroupreq *)data)))) 2917 return (error); 2918 break; 2919 2920 default: 2921 error = ENOIOCTL; 2922 break; 2923 } 2924 return (error); 2925 } 2926 2927 #ifdef COMPAT_FREEBSD32 2928 struct ifconf32 { 2929 int32_t ifc_len; 2930 union { 2931 uint32_t ifcu_buf; 2932 uint32_t ifcu_req; 2933 } ifc_ifcu; 2934 }; 2935 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2936 #endif 2937 2938 #ifdef COMPAT_FREEBSD32 2939 static void 2940 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2941 { 2942 struct ifmediareq32 *ifmr32; 2943 2944 ifmr32 = (struct ifmediareq32 *)data; 2945 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2946 sizeof(ifmr->ifm_name)); 2947 ifmr->ifm_current = ifmr32->ifm_current; 2948 ifmr->ifm_mask = ifmr32->ifm_mask; 2949 ifmr->ifm_status = ifmr32->ifm_status; 2950 ifmr->ifm_active = ifmr32->ifm_active; 2951 ifmr->ifm_count = ifmr32->ifm_count; 2952 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2953 } 2954 2955 static void 2956 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2957 { 2958 struct ifmediareq32 *ifmr32; 2959 2960 ifmr32 = (struct ifmediareq32 *)data; 2961 ifmr32->ifm_current = ifmr->ifm_current; 2962 ifmr32->ifm_mask = ifmr->ifm_mask; 2963 ifmr32->ifm_status = ifmr->ifm_status; 2964 ifmr32->ifm_active = ifmr->ifm_active; 2965 ifmr32->ifm_count = ifmr->ifm_count; 2966 } 2967 #endif 2968 2969 /* 2970 * Interface ioctls. 2971 */ 2972 int 2973 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2974 { 2975 #ifdef COMPAT_FREEBSD32 2976 caddr_t saved_data = NULL; 2977 struct ifmediareq ifmr; 2978 struct ifmediareq *ifmrp; 2979 #endif 2980 struct ifnet *ifp; 2981 struct ifreq *ifr; 2982 int error; 2983 int oif_flags; 2984 #ifdef VIMAGE 2985 int shutdown; 2986 #endif 2987 2988 CURVNET_SET(so->so_vnet); 2989 #ifdef VIMAGE 2990 /* Make sure the VNET is stable. */ 2991 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 2992 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 2993 if (shutdown) { 2994 CURVNET_RESTORE(); 2995 return (EBUSY); 2996 } 2997 #endif 2998 2999 3000 switch (cmd) { 3001 case SIOCGIFCONF: 3002 error = ifconf(cmd, data); 3003 CURVNET_RESTORE(); 3004 return (error); 3005 3006 #ifdef COMPAT_FREEBSD32 3007 case SIOCGIFCONF32: 3008 { 3009 struct ifconf32 *ifc32; 3010 struct ifconf ifc; 3011 3012 ifc32 = (struct ifconf32 *)data; 3013 ifc.ifc_len = ifc32->ifc_len; 3014 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3015 3016 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3017 CURVNET_RESTORE(); 3018 if (error == 0) 3019 ifc32->ifc_len = ifc.ifc_len; 3020 return (error); 3021 } 3022 #endif 3023 } 3024 3025 #ifdef COMPAT_FREEBSD32 3026 ifmrp = NULL; 3027 switch (cmd) { 3028 case SIOCGIFMEDIA32: 3029 case SIOCGIFXMEDIA32: 3030 ifmrp = &ifmr; 3031 ifmr_init(ifmrp, data); 3032 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3033 saved_data = data; 3034 data = (caddr_t)ifmrp; 3035 } 3036 #endif 3037 3038 ifr = (struct ifreq *)data; 3039 switch (cmd) { 3040 #ifdef VIMAGE 3041 case SIOCSIFRVNET: 3042 error = priv_check(td, PRIV_NET_SETIFVNET); 3043 if (error == 0) 3044 error = if_vmove_reclaim(td, ifr->ifr_name, 3045 ifr->ifr_jid); 3046 goto out_noref; 3047 #endif 3048 case SIOCIFCREATE: 3049 case SIOCIFCREATE2: 3050 error = priv_check(td, PRIV_NET_IFCREATE); 3051 if (error == 0) 3052 error = if_clone_create(ifr->ifr_name, 3053 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3054 ifr_data_get_ptr(ifr) : NULL); 3055 goto out_noref; 3056 case SIOCIFDESTROY: 3057 error = priv_check(td, PRIV_NET_IFDESTROY); 3058 if (error == 0) 3059 error = if_clone_destroy(ifr->ifr_name); 3060 goto out_noref; 3061 3062 case SIOCIFGCLONERS: 3063 error = if_clone_list((struct if_clonereq *)data); 3064 goto out_noref; 3065 3066 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3067 error = if_getgroupmembers((struct ifgroupreq *)data); 3068 goto out_noref; 3069 3070 #if defined(INET) || defined(INET6) 3071 case SIOCSVH: 3072 case SIOCGVH: 3073 if (carp_ioctl_p == NULL) 3074 error = EPROTONOSUPPORT; 3075 else 3076 error = (*carp_ioctl_p)(ifr, cmd, td); 3077 goto out_noref; 3078 #endif 3079 } 3080 3081 ifp = ifunit_ref(ifr->ifr_name); 3082 if (ifp == NULL) { 3083 error = ENXIO; 3084 goto out_noref; 3085 } 3086 3087 error = ifhwioctl(cmd, ifp, data, td); 3088 if (error != ENOIOCTL) 3089 goto out_ref; 3090 3091 oif_flags = ifp->if_flags; 3092 if (so->so_proto == NULL) { 3093 error = EOPNOTSUPP; 3094 goto out_ref; 3095 } 3096 3097 /* 3098 * Pass the request on to the socket control method, and if the 3099 * latter returns EOPNOTSUPP, directly to the interface. 3100 * 3101 * Make an exception for the legacy SIOCSIF* requests. Drivers 3102 * trust SIOCSIFADDR et al to come from an already privileged 3103 * layer, and do not perform any credentials checks or input 3104 * validation. 3105 */ 3106 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3107 ifp, td)); 3108 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3109 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3110 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3111 error = (*ifp->if_ioctl)(ifp, cmd, data); 3112 3113 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3114 #ifdef INET6 3115 if (ifp->if_flags & IFF_UP) 3116 in6_if_up(ifp); 3117 #endif 3118 } 3119 3120 out_ref: 3121 if_rele(ifp); 3122 out_noref: 3123 #ifdef COMPAT_FREEBSD32 3124 if (ifmrp != NULL) { 3125 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3126 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3127 cmd)); 3128 data = saved_data; 3129 ifmr_update(ifmrp, data); 3130 } 3131 #endif 3132 CURVNET_RESTORE(); 3133 return (error); 3134 } 3135 3136 /* 3137 * The code common to handling reference counted flags, 3138 * e.g., in ifpromisc() and if_allmulti(). 3139 * The "pflag" argument can specify a permanent mode flag to check, 3140 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3141 * 3142 * Only to be used on stack-owned flags, not driver-owned flags. 3143 */ 3144 static int 3145 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3146 { 3147 struct ifreq ifr; 3148 int error; 3149 int oldflags, oldcount; 3150 3151 /* Sanity checks to catch programming errors */ 3152 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3153 ("%s: setting driver-owned flag %d", __func__, flag)); 3154 3155 if (onswitch) 3156 KASSERT(*refcount >= 0, 3157 ("%s: increment negative refcount %d for flag %d", 3158 __func__, *refcount, flag)); 3159 else 3160 KASSERT(*refcount > 0, 3161 ("%s: decrement non-positive refcount %d for flag %d", 3162 __func__, *refcount, flag)); 3163 3164 /* In case this mode is permanent, just touch refcount */ 3165 if (ifp->if_flags & pflag) { 3166 *refcount += onswitch ? 1 : -1; 3167 return (0); 3168 } 3169 3170 /* Save ifnet parameters for if_ioctl() may fail */ 3171 oldcount = *refcount; 3172 oldflags = ifp->if_flags; 3173 3174 /* 3175 * See if we aren't the only and touching refcount is enough. 3176 * Actually toggle interface flag if we are the first or last. 3177 */ 3178 if (onswitch) { 3179 if ((*refcount)++) 3180 return (0); 3181 ifp->if_flags |= flag; 3182 } else { 3183 if (--(*refcount)) 3184 return (0); 3185 ifp->if_flags &= ~flag; 3186 } 3187 3188 /* Call down the driver since we've changed interface flags */ 3189 if (ifp->if_ioctl == NULL) { 3190 error = EOPNOTSUPP; 3191 goto recover; 3192 } 3193 ifr.ifr_flags = ifp->if_flags & 0xffff; 3194 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3195 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3196 if (error) 3197 goto recover; 3198 /* Notify userland that interface flags have changed */ 3199 rt_ifmsg(ifp); 3200 return (0); 3201 3202 recover: 3203 /* Recover after driver error */ 3204 *refcount = oldcount; 3205 ifp->if_flags = oldflags; 3206 return (error); 3207 } 3208 3209 /* 3210 * Set/clear promiscuous mode on interface ifp based on the truth value 3211 * of pswitch. The calls are reference counted so that only the first 3212 * "on" request actually has an effect, as does the final "off" request. 3213 * Results are undefined if the "off" and "on" requests are not matched. 3214 */ 3215 int 3216 ifpromisc(struct ifnet *ifp, int pswitch) 3217 { 3218 int error; 3219 int oldflags = ifp->if_flags; 3220 3221 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3222 &ifp->if_pcount, pswitch); 3223 /* If promiscuous mode status has changed, log a message */ 3224 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3225 log_promisc_mode_change) 3226 if_printf(ifp, "promiscuous mode %s\n", 3227 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3228 return (error); 3229 } 3230 3231 /* 3232 * Return interface configuration 3233 * of system. List may be used 3234 * in later ioctl's (above) to get 3235 * other information. 3236 */ 3237 /*ARGSUSED*/ 3238 static int 3239 ifconf(u_long cmd, caddr_t data) 3240 { 3241 struct ifconf *ifc = (struct ifconf *)data; 3242 struct ifnet *ifp; 3243 struct ifaddr *ifa; 3244 struct ifreq ifr; 3245 struct sbuf *sb; 3246 int error, full = 0, valid_len, max_len; 3247 3248 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3249 max_len = MAXPHYS - 1; 3250 3251 /* Prevent hostile input from being able to crash the system */ 3252 if (ifc->ifc_len <= 0) 3253 return (EINVAL); 3254 3255 again: 3256 if (ifc->ifc_len <= max_len) { 3257 max_len = ifc->ifc_len; 3258 full = 1; 3259 } 3260 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3261 max_len = 0; 3262 valid_len = 0; 3263 3264 IFNET_RLOCK(); 3265 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3266 struct epoch_tracker et; 3267 int addrs; 3268 3269 /* 3270 * Zero the ifr to make sure we don't disclose the contents 3271 * of the stack. 3272 */ 3273 memset(&ifr, 0, sizeof(ifr)); 3274 3275 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3276 >= sizeof(ifr.ifr_name)) { 3277 sbuf_delete(sb); 3278 IFNET_RUNLOCK(); 3279 return (ENAMETOOLONG); 3280 } 3281 3282 addrs = 0; 3283 NET_EPOCH_ENTER(et); 3284 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3285 struct sockaddr *sa = ifa->ifa_addr; 3286 3287 if (prison_if(curthread->td_ucred, sa) != 0) 3288 continue; 3289 addrs++; 3290 if (sa->sa_len <= sizeof(*sa)) { 3291 if (sa->sa_len < sizeof(*sa)) { 3292 memset(&ifr.ifr_ifru.ifru_addr, 0, 3293 sizeof(ifr.ifr_ifru.ifru_addr)); 3294 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3295 sa->sa_len); 3296 } else 3297 ifr.ifr_ifru.ifru_addr = *sa; 3298 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3299 max_len += sizeof(ifr); 3300 } else { 3301 sbuf_bcat(sb, &ifr, 3302 offsetof(struct ifreq, ifr_addr)); 3303 max_len += offsetof(struct ifreq, ifr_addr); 3304 sbuf_bcat(sb, sa, sa->sa_len); 3305 max_len += sa->sa_len; 3306 } 3307 3308 if (sbuf_error(sb) == 0) 3309 valid_len = sbuf_len(sb); 3310 } 3311 NET_EPOCH_EXIT(et); 3312 if (addrs == 0) { 3313 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3314 max_len += sizeof(ifr); 3315 3316 if (sbuf_error(sb) == 0) 3317 valid_len = sbuf_len(sb); 3318 } 3319 } 3320 IFNET_RUNLOCK(); 3321 3322 /* 3323 * If we didn't allocate enough space (uncommon), try again. If 3324 * we have already allocated as much space as we are allowed, 3325 * return what we've got. 3326 */ 3327 if (valid_len != max_len && !full) { 3328 sbuf_delete(sb); 3329 goto again; 3330 } 3331 3332 ifc->ifc_len = valid_len; 3333 sbuf_finish(sb); 3334 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3335 sbuf_delete(sb); 3336 return (error); 3337 } 3338 3339 /* 3340 * Just like ifpromisc(), but for all-multicast-reception mode. 3341 */ 3342 int 3343 if_allmulti(struct ifnet *ifp, int onswitch) 3344 { 3345 3346 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3347 } 3348 3349 struct ifmultiaddr * 3350 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3351 { 3352 struct ifmultiaddr *ifma; 3353 3354 IF_ADDR_LOCK_ASSERT(ifp); 3355 3356 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3357 if (sa->sa_family == AF_LINK) { 3358 if (sa_dl_equal(ifma->ifma_addr, sa)) 3359 break; 3360 } else { 3361 if (sa_equal(ifma->ifma_addr, sa)) 3362 break; 3363 } 3364 } 3365 3366 return ifma; 3367 } 3368 3369 /* 3370 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3371 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3372 * the ifnet multicast address list here, so the caller must do that and 3373 * other setup work (such as notifying the device driver). The reference 3374 * count is initialized to 1. 3375 */ 3376 static struct ifmultiaddr * 3377 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3378 int mflags) 3379 { 3380 struct ifmultiaddr *ifma; 3381 struct sockaddr *dupsa; 3382 3383 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3384 M_ZERO); 3385 if (ifma == NULL) 3386 return (NULL); 3387 3388 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3389 if (dupsa == NULL) { 3390 free(ifma, M_IFMADDR); 3391 return (NULL); 3392 } 3393 bcopy(sa, dupsa, sa->sa_len); 3394 ifma->ifma_addr = dupsa; 3395 3396 ifma->ifma_ifp = ifp; 3397 ifma->ifma_refcount = 1; 3398 ifma->ifma_protospec = NULL; 3399 3400 if (llsa == NULL) { 3401 ifma->ifma_lladdr = NULL; 3402 return (ifma); 3403 } 3404 3405 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3406 if (dupsa == NULL) { 3407 free(ifma->ifma_addr, M_IFMADDR); 3408 free(ifma, M_IFMADDR); 3409 return (NULL); 3410 } 3411 bcopy(llsa, dupsa, llsa->sa_len); 3412 ifma->ifma_lladdr = dupsa; 3413 3414 return (ifma); 3415 } 3416 3417 /* 3418 * if_freemulti: free ifmultiaddr structure and possibly attached related 3419 * addresses. The caller is responsible for implementing reference 3420 * counting, notifying the driver, handling routing messages, and releasing 3421 * any dependent link layer state. 3422 */ 3423 #ifdef MCAST_VERBOSE 3424 extern void kdb_backtrace(void); 3425 #endif 3426 static void 3427 if_freemulti_internal(struct ifmultiaddr *ifma) 3428 { 3429 3430 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3431 ifma->ifma_refcount)); 3432 3433 if (ifma->ifma_lladdr != NULL) 3434 free(ifma->ifma_lladdr, M_IFMADDR); 3435 #ifdef MCAST_VERBOSE 3436 kdb_backtrace(); 3437 printf("%s freeing ifma: %p\n", __func__, ifma); 3438 #endif 3439 free(ifma->ifma_addr, M_IFMADDR); 3440 free(ifma, M_IFMADDR); 3441 } 3442 3443 static void 3444 if_destroymulti(epoch_context_t ctx) 3445 { 3446 struct ifmultiaddr *ifma; 3447 3448 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3449 if_freemulti_internal(ifma); 3450 } 3451 3452 void 3453 if_freemulti(struct ifmultiaddr *ifma) 3454 { 3455 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3456 ifma->ifma_refcount)); 3457 3458 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3459 } 3460 3461 3462 /* 3463 * Register an additional multicast address with a network interface. 3464 * 3465 * - If the address is already present, bump the reference count on the 3466 * address and return. 3467 * - If the address is not link-layer, look up a link layer address. 3468 * - Allocate address structures for one or both addresses, and attach to the 3469 * multicast address list on the interface. If automatically adding a link 3470 * layer address, the protocol address will own a reference to the link 3471 * layer address, to be freed when it is freed. 3472 * - Notify the network device driver of an addition to the multicast address 3473 * list. 3474 * 3475 * 'sa' points to caller-owned memory with the desired multicast address. 3476 * 3477 * 'retifma' will be used to return a pointer to the resulting multicast 3478 * address reference, if desired. 3479 */ 3480 int 3481 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3482 struct ifmultiaddr **retifma) 3483 { 3484 struct ifmultiaddr *ifma, *ll_ifma; 3485 struct sockaddr *llsa; 3486 struct sockaddr_dl sdl; 3487 int error; 3488 3489 #ifdef INET 3490 IN_MULTI_LIST_UNLOCK_ASSERT(); 3491 #endif 3492 #ifdef INET6 3493 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3494 #endif 3495 /* 3496 * If the address is already present, return a new reference to it; 3497 * otherwise, allocate storage and set up a new address. 3498 */ 3499 IF_ADDR_WLOCK(ifp); 3500 ifma = if_findmulti(ifp, sa); 3501 if (ifma != NULL) { 3502 ifma->ifma_refcount++; 3503 if (retifma != NULL) 3504 *retifma = ifma; 3505 IF_ADDR_WUNLOCK(ifp); 3506 return (0); 3507 } 3508 3509 /* 3510 * The address isn't already present; resolve the protocol address 3511 * into a link layer address, and then look that up, bump its 3512 * refcount or allocate an ifma for that also. 3513 * Most link layer resolving functions returns address data which 3514 * fits inside default sockaddr_dl structure. However callback 3515 * can allocate another sockaddr structure, in that case we need to 3516 * free it later. 3517 */ 3518 llsa = NULL; 3519 ll_ifma = NULL; 3520 if (ifp->if_resolvemulti != NULL) { 3521 /* Provide called function with buffer size information */ 3522 sdl.sdl_len = sizeof(sdl); 3523 llsa = (struct sockaddr *)&sdl; 3524 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3525 if (error) 3526 goto unlock_out; 3527 } 3528 3529 /* 3530 * Allocate the new address. Don't hook it up yet, as we may also 3531 * need to allocate a link layer multicast address. 3532 */ 3533 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3534 if (ifma == NULL) { 3535 error = ENOMEM; 3536 goto free_llsa_out; 3537 } 3538 3539 /* 3540 * If a link layer address is found, we'll need to see if it's 3541 * already present in the address list, or allocate is as well. 3542 * When this block finishes, the link layer address will be on the 3543 * list. 3544 */ 3545 if (llsa != NULL) { 3546 ll_ifma = if_findmulti(ifp, llsa); 3547 if (ll_ifma == NULL) { 3548 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3549 if (ll_ifma == NULL) { 3550 --ifma->ifma_refcount; 3551 if_freemulti(ifma); 3552 error = ENOMEM; 3553 goto free_llsa_out; 3554 } 3555 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3556 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3557 ifma_link); 3558 } else 3559 ll_ifma->ifma_refcount++; 3560 ifma->ifma_llifma = ll_ifma; 3561 } 3562 3563 /* 3564 * We now have a new multicast address, ifma, and possibly a new or 3565 * referenced link layer address. Add the primary address to the 3566 * ifnet address list. 3567 */ 3568 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3569 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3570 3571 if (retifma != NULL) 3572 *retifma = ifma; 3573 3574 /* 3575 * Must generate the message while holding the lock so that 'ifma' 3576 * pointer is still valid. 3577 */ 3578 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3579 IF_ADDR_WUNLOCK(ifp); 3580 3581 /* 3582 * We are certain we have added something, so call down to the 3583 * interface to let them know about it. 3584 */ 3585 if (ifp->if_ioctl != NULL) { 3586 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3587 } 3588 3589 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3590 link_free_sdl(llsa); 3591 3592 return (0); 3593 3594 free_llsa_out: 3595 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3596 link_free_sdl(llsa); 3597 3598 unlock_out: 3599 IF_ADDR_WUNLOCK(ifp); 3600 return (error); 3601 } 3602 3603 /* 3604 * Delete a multicast group membership by network-layer group address. 3605 * 3606 * Returns ENOENT if the entry could not be found. If ifp no longer 3607 * exists, results are undefined. This entry point should only be used 3608 * from subsystems which do appropriate locking to hold ifp for the 3609 * duration of the call. 3610 * Network-layer protocol domains must use if_delmulti_ifma(). 3611 */ 3612 int 3613 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3614 { 3615 struct ifmultiaddr *ifma; 3616 int lastref; 3617 #ifdef INVARIANTS 3618 struct epoch_tracker et; 3619 struct ifnet *oifp; 3620 3621 NET_EPOCH_ENTER(et); 3622 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3623 if (ifp == oifp) 3624 break; 3625 if (ifp != oifp) 3626 ifp = NULL; 3627 NET_EPOCH_EXIT(et); 3628 3629 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3630 #endif 3631 if (ifp == NULL) 3632 return (ENOENT); 3633 3634 IF_ADDR_WLOCK(ifp); 3635 lastref = 0; 3636 ifma = if_findmulti(ifp, sa); 3637 if (ifma != NULL) 3638 lastref = if_delmulti_locked(ifp, ifma, 0); 3639 IF_ADDR_WUNLOCK(ifp); 3640 3641 if (ifma == NULL) 3642 return (ENOENT); 3643 3644 if (lastref && ifp->if_ioctl != NULL) { 3645 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3646 } 3647 3648 return (0); 3649 } 3650 3651 /* 3652 * Delete all multicast group membership for an interface. 3653 * Should be used to quickly flush all multicast filters. 3654 */ 3655 void 3656 if_delallmulti(struct ifnet *ifp) 3657 { 3658 struct ifmultiaddr *ifma; 3659 struct ifmultiaddr *next; 3660 3661 IF_ADDR_WLOCK(ifp); 3662 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3663 if_delmulti_locked(ifp, ifma, 0); 3664 IF_ADDR_WUNLOCK(ifp); 3665 } 3666 3667 void 3668 if_delmulti_ifma(struct ifmultiaddr *ifma) 3669 { 3670 if_delmulti_ifma_flags(ifma, 0); 3671 } 3672 3673 /* 3674 * Delete a multicast group membership by group membership pointer. 3675 * Network-layer protocol domains must use this routine. 3676 * 3677 * It is safe to call this routine if the ifp disappeared. 3678 */ 3679 void 3680 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3681 { 3682 struct ifnet *ifp; 3683 int lastref; 3684 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3685 #ifdef INET 3686 IN_MULTI_LIST_UNLOCK_ASSERT(); 3687 #endif 3688 ifp = ifma->ifma_ifp; 3689 #ifdef DIAGNOSTIC 3690 if (ifp == NULL) { 3691 printf("%s: ifma_ifp seems to be detached\n", __func__); 3692 } else { 3693 struct epoch_tracker et; 3694 struct ifnet *oifp; 3695 3696 NET_EPOCH_ENTER(et); 3697 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3698 if (ifp == oifp) 3699 break; 3700 if (ifp != oifp) 3701 ifp = NULL; 3702 NET_EPOCH_EXIT(et); 3703 } 3704 #endif 3705 /* 3706 * If and only if the ifnet instance exists: Acquire the address lock. 3707 */ 3708 if (ifp != NULL) 3709 IF_ADDR_WLOCK(ifp); 3710 3711 lastref = if_delmulti_locked(ifp, ifma, flags); 3712 3713 if (ifp != NULL) { 3714 /* 3715 * If and only if the ifnet instance exists: 3716 * Release the address lock. 3717 * If the group was left: update the hardware hash filter. 3718 */ 3719 IF_ADDR_WUNLOCK(ifp); 3720 if (lastref && ifp->if_ioctl != NULL) { 3721 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3722 } 3723 } 3724 } 3725 3726 /* 3727 * Perform deletion of network-layer and/or link-layer multicast address. 3728 * 3729 * Return 0 if the reference count was decremented. 3730 * Return 1 if the final reference was released, indicating that the 3731 * hardware hash filter should be reprogrammed. 3732 */ 3733 static int 3734 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3735 { 3736 struct ifmultiaddr *ll_ifma; 3737 3738 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3739 KASSERT(ifma->ifma_ifp == ifp, 3740 ("%s: inconsistent ifp %p", __func__, ifp)); 3741 IF_ADDR_WLOCK_ASSERT(ifp); 3742 } 3743 3744 ifp = ifma->ifma_ifp; 3745 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3746 3747 /* 3748 * If the ifnet is detaching, null out references to ifnet, 3749 * so that upper protocol layers will notice, and not attempt 3750 * to obtain locks for an ifnet which no longer exists. The 3751 * routing socket announcement must happen before the ifnet 3752 * instance is detached from the system. 3753 */ 3754 if (detaching) { 3755 #ifdef DIAGNOSTIC 3756 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3757 #endif 3758 /* 3759 * ifp may already be nulled out if we are being reentered 3760 * to delete the ll_ifma. 3761 */ 3762 if (ifp != NULL) { 3763 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3764 ifma->ifma_ifp = NULL; 3765 } 3766 } 3767 3768 if (--ifma->ifma_refcount > 0) 3769 return 0; 3770 3771 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3772 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3773 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3774 } 3775 /* 3776 * If this ifma is a network-layer ifma, a link-layer ifma may 3777 * have been associated with it. Release it first if so. 3778 */ 3779 ll_ifma = ifma->ifma_llifma; 3780 if (ll_ifma != NULL) { 3781 KASSERT(ifma->ifma_lladdr != NULL, 3782 ("%s: llifma w/o lladdr", __func__)); 3783 if (detaching) 3784 ll_ifma->ifma_ifp = NULL; /* XXX */ 3785 if (--ll_ifma->ifma_refcount == 0) { 3786 if (ifp != NULL) { 3787 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3788 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3789 ifma_link); 3790 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3791 } 3792 } 3793 if_freemulti(ll_ifma); 3794 } 3795 } 3796 #ifdef INVARIANTS 3797 if (ifp) { 3798 struct ifmultiaddr *ifmatmp; 3799 3800 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3801 MPASS(ifma != ifmatmp); 3802 } 3803 #endif 3804 if_freemulti(ifma); 3805 /* 3806 * The last reference to this instance of struct ifmultiaddr 3807 * was released; the hardware should be notified of this change. 3808 */ 3809 return 1; 3810 } 3811 3812 /* 3813 * Set the link layer address on an interface. 3814 * 3815 * At this time we only support certain types of interfaces, 3816 * and we don't allow the length of the address to change. 3817 * 3818 * Set noinline to be dtrace-friendly 3819 */ 3820 __noinline int 3821 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3822 { 3823 struct sockaddr_dl *sdl; 3824 struct ifaddr *ifa; 3825 struct ifreq ifr; 3826 struct epoch_tracker et; 3827 int rc; 3828 3829 rc = 0; 3830 NET_EPOCH_ENTER(et); 3831 ifa = ifp->if_addr; 3832 if (ifa == NULL) { 3833 rc = EINVAL; 3834 goto out; 3835 } 3836 3837 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3838 if (sdl == NULL) { 3839 rc = EINVAL; 3840 goto out; 3841 } 3842 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3843 rc = EINVAL; 3844 goto out; 3845 } 3846 switch (ifp->if_type) { 3847 case IFT_ETHER: 3848 case IFT_XETHER: 3849 case IFT_L2VLAN: 3850 case IFT_BRIDGE: 3851 case IFT_IEEE8023ADLAG: 3852 bcopy(lladdr, LLADDR(sdl), len); 3853 break; 3854 default: 3855 rc = ENODEV; 3856 goto out; 3857 } 3858 3859 /* 3860 * If the interface is already up, we need 3861 * to re-init it in order to reprogram its 3862 * address filter. 3863 */ 3864 NET_EPOCH_EXIT(et); 3865 if ((ifp->if_flags & IFF_UP) != 0) { 3866 if (ifp->if_ioctl) { 3867 ifp->if_flags &= ~IFF_UP; 3868 ifr.ifr_flags = ifp->if_flags & 0xffff; 3869 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3870 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3871 ifp->if_flags |= IFF_UP; 3872 ifr.ifr_flags = ifp->if_flags & 0xffff; 3873 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3874 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3875 } 3876 } 3877 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3878 return (0); 3879 out: 3880 NET_EPOCH_EXIT(et); 3881 return (rc); 3882 } 3883 3884 /* 3885 * Compat function for handling basic encapsulation requests. 3886 * Not converted stacks (FDDI, IB, ..) supports traditional 3887 * output model: ARP (and other similar L2 protocols) are handled 3888 * inside output routine, arpresolve/nd6_resolve() returns MAC 3889 * address instead of full prepend. 3890 * 3891 * This function creates calculated header==MAC for IPv4/IPv6 and 3892 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3893 * address families. 3894 */ 3895 static int 3896 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3897 { 3898 3899 if (req->rtype != IFENCAP_LL) 3900 return (EOPNOTSUPP); 3901 3902 if (req->bufsize < req->lladdr_len) 3903 return (ENOMEM); 3904 3905 switch (req->family) { 3906 case AF_INET: 3907 case AF_INET6: 3908 break; 3909 default: 3910 return (EAFNOSUPPORT); 3911 } 3912 3913 /* Copy lladdr to storage as is */ 3914 memmove(req->buf, req->lladdr, req->lladdr_len); 3915 req->bufsize = req->lladdr_len; 3916 req->lladdr_off = 0; 3917 3918 return (0); 3919 } 3920 3921 /* 3922 * Tunnel interfaces can nest, also they may cause infinite recursion 3923 * calls when misconfigured. We'll prevent this by detecting loops. 3924 * High nesting level may cause stack exhaustion. We'll prevent this 3925 * by introducing upper limit. 3926 * 3927 * Return 0, if tunnel nesting count is equal or less than limit. 3928 */ 3929 int 3930 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3931 int limit) 3932 { 3933 struct m_tag *mtag; 3934 int count; 3935 3936 count = 1; 3937 mtag = NULL; 3938 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3939 if (*(struct ifnet **)(mtag + 1) == ifp) { 3940 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3941 return (EIO); 3942 } 3943 count++; 3944 } 3945 if (count > limit) { 3946 log(LOG_NOTICE, 3947 "%s: if_output recursively called too many times(%d)\n", 3948 if_name(ifp), count); 3949 return (EIO); 3950 } 3951 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3952 if (mtag == NULL) 3953 return (ENOMEM); 3954 *(struct ifnet **)(mtag + 1) = ifp; 3955 m_tag_prepend(m, mtag); 3956 return (0); 3957 } 3958 3959 /* 3960 * Get the link layer address that was read from the hardware at attach. 3961 * 3962 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3963 * their component interfaces as IFT_IEEE8023ADLAG. 3964 */ 3965 int 3966 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3967 { 3968 3969 if (ifp->if_hw_addr == NULL) 3970 return (ENODEV); 3971 3972 switch (ifp->if_type) { 3973 case IFT_ETHER: 3974 case IFT_IEEE8023ADLAG: 3975 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3976 return (0); 3977 default: 3978 return (ENODEV); 3979 } 3980 } 3981 3982 /* 3983 * The name argument must be a pointer to storage which will last as 3984 * long as the interface does. For physical devices, the result of 3985 * device_get_name(dev) is a good choice and for pseudo-devices a 3986 * static string works well. 3987 */ 3988 void 3989 if_initname(struct ifnet *ifp, const char *name, int unit) 3990 { 3991 ifp->if_dname = name; 3992 ifp->if_dunit = unit; 3993 if (unit != IF_DUNIT_NONE) 3994 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3995 else 3996 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3997 } 3998 3999 int 4000 if_printf(struct ifnet *ifp, const char *fmt, ...) 4001 { 4002 char if_fmt[256]; 4003 va_list ap; 4004 4005 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 4006 va_start(ap, fmt); 4007 vlog(LOG_INFO, if_fmt, ap); 4008 va_end(ap); 4009 return (0); 4010 } 4011 4012 void 4013 if_start(struct ifnet *ifp) 4014 { 4015 4016 (*(ifp)->if_start)(ifp); 4017 } 4018 4019 /* 4020 * Backwards compatibility interface for drivers 4021 * that have not implemented it 4022 */ 4023 static int 4024 if_transmit(struct ifnet *ifp, struct mbuf *m) 4025 { 4026 int error; 4027 4028 IFQ_HANDOFF(ifp, m, error); 4029 return (error); 4030 } 4031 4032 static void 4033 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4034 { 4035 4036 m_freem(m); 4037 } 4038 4039 int 4040 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4041 { 4042 int active = 0; 4043 4044 IF_LOCK(ifq); 4045 if (_IF_QFULL(ifq)) { 4046 IF_UNLOCK(ifq); 4047 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4048 m_freem(m); 4049 return (0); 4050 } 4051 if (ifp != NULL) { 4052 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4053 if (m->m_flags & (M_BCAST|M_MCAST)) 4054 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4055 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4056 } 4057 _IF_ENQUEUE(ifq, m); 4058 IF_UNLOCK(ifq); 4059 if (ifp != NULL && !active) 4060 (*(ifp)->if_start)(ifp); 4061 return (1); 4062 } 4063 4064 void 4065 if_register_com_alloc(u_char type, 4066 if_com_alloc_t *a, if_com_free_t *f) 4067 { 4068 4069 KASSERT(if_com_alloc[type] == NULL, 4070 ("if_register_com_alloc: %d already registered", type)); 4071 KASSERT(if_com_free[type] == NULL, 4072 ("if_register_com_alloc: %d free already registered", type)); 4073 4074 if_com_alloc[type] = a; 4075 if_com_free[type] = f; 4076 } 4077 4078 void 4079 if_deregister_com_alloc(u_char type) 4080 { 4081 4082 KASSERT(if_com_alloc[type] != NULL, 4083 ("if_deregister_com_alloc: %d not registered", type)); 4084 KASSERT(if_com_free[type] != NULL, 4085 ("if_deregister_com_alloc: %d free not registered", type)); 4086 if_com_alloc[type] = NULL; 4087 if_com_free[type] = NULL; 4088 } 4089 4090 /* API for driver access to network stack owned ifnet.*/ 4091 uint64_t 4092 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4093 { 4094 uint64_t oldbrate; 4095 4096 oldbrate = ifp->if_baudrate; 4097 ifp->if_baudrate = baudrate; 4098 return (oldbrate); 4099 } 4100 4101 uint64_t 4102 if_getbaudrate(if_t ifp) 4103 { 4104 4105 return (((struct ifnet *)ifp)->if_baudrate); 4106 } 4107 4108 int 4109 if_setcapabilities(if_t ifp, int capabilities) 4110 { 4111 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4112 return (0); 4113 } 4114 4115 int 4116 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4117 { 4118 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4119 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4120 4121 return (0); 4122 } 4123 4124 int 4125 if_getcapabilities(if_t ifp) 4126 { 4127 return ((struct ifnet *)ifp)->if_capabilities; 4128 } 4129 4130 int 4131 if_setcapenable(if_t ifp, int capabilities) 4132 { 4133 ((struct ifnet *)ifp)->if_capenable = capabilities; 4134 return (0); 4135 } 4136 4137 int 4138 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4139 { 4140 if(setcap) 4141 ((struct ifnet *)ifp)->if_capenable |= setcap; 4142 if(clearcap) 4143 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4144 4145 return (0); 4146 } 4147 4148 const char * 4149 if_getdname(if_t ifp) 4150 { 4151 return ((struct ifnet *)ifp)->if_dname; 4152 } 4153 4154 int 4155 if_togglecapenable(if_t ifp, int togglecap) 4156 { 4157 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4158 return (0); 4159 } 4160 4161 int 4162 if_getcapenable(if_t ifp) 4163 { 4164 return ((struct ifnet *)ifp)->if_capenable; 4165 } 4166 4167 /* 4168 * This is largely undesirable because it ties ifnet to a device, but does 4169 * provide flexiblity for an embedded product vendor. Should be used with 4170 * the understanding that it violates the interface boundaries, and should be 4171 * a last resort only. 4172 */ 4173 int 4174 if_setdev(if_t ifp, void *dev) 4175 { 4176 return (0); 4177 } 4178 4179 int 4180 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4181 { 4182 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4183 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4184 4185 return (0); 4186 } 4187 4188 int 4189 if_getdrvflags(if_t ifp) 4190 { 4191 return ((struct ifnet *)ifp)->if_drv_flags; 4192 } 4193 4194 int 4195 if_setdrvflags(if_t ifp, int flags) 4196 { 4197 ((struct ifnet *)ifp)->if_drv_flags = flags; 4198 return (0); 4199 } 4200 4201 4202 int 4203 if_setflags(if_t ifp, int flags) 4204 { 4205 ((struct ifnet *)ifp)->if_flags = flags; 4206 return (0); 4207 } 4208 4209 int 4210 if_setflagbits(if_t ifp, int set, int clear) 4211 { 4212 ((struct ifnet *)ifp)->if_flags |= set; 4213 ((struct ifnet *)ifp)->if_flags &= ~clear; 4214 4215 return (0); 4216 } 4217 4218 int 4219 if_getflags(if_t ifp) 4220 { 4221 return ((struct ifnet *)ifp)->if_flags; 4222 } 4223 4224 int 4225 if_clearhwassist(if_t ifp) 4226 { 4227 ((struct ifnet *)ifp)->if_hwassist = 0; 4228 return (0); 4229 } 4230 4231 int 4232 if_sethwassistbits(if_t ifp, int toset, int toclear) 4233 { 4234 ((struct ifnet *)ifp)->if_hwassist |= toset; 4235 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4236 4237 return (0); 4238 } 4239 4240 int 4241 if_sethwassist(if_t ifp, int hwassist_bit) 4242 { 4243 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4244 return (0); 4245 } 4246 4247 int 4248 if_gethwassist(if_t ifp) 4249 { 4250 return ((struct ifnet *)ifp)->if_hwassist; 4251 } 4252 4253 int 4254 if_setmtu(if_t ifp, int mtu) 4255 { 4256 ((struct ifnet *)ifp)->if_mtu = mtu; 4257 return (0); 4258 } 4259 4260 int 4261 if_getmtu(if_t ifp) 4262 { 4263 return ((struct ifnet *)ifp)->if_mtu; 4264 } 4265 4266 int 4267 if_getmtu_family(if_t ifp, int family) 4268 { 4269 struct domain *dp; 4270 4271 for (dp = domains; dp; dp = dp->dom_next) { 4272 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4273 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4274 } 4275 4276 return (((struct ifnet *)ifp)->if_mtu); 4277 } 4278 4279 int 4280 if_setsoftc(if_t ifp, void *softc) 4281 { 4282 ((struct ifnet *)ifp)->if_softc = softc; 4283 return (0); 4284 } 4285 4286 void * 4287 if_getsoftc(if_t ifp) 4288 { 4289 return ((struct ifnet *)ifp)->if_softc; 4290 } 4291 4292 void 4293 if_setrcvif(struct mbuf *m, if_t ifp) 4294 { 4295 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4296 } 4297 4298 void 4299 if_setvtag(struct mbuf *m, uint16_t tag) 4300 { 4301 m->m_pkthdr.ether_vtag = tag; 4302 } 4303 4304 uint16_t 4305 if_getvtag(struct mbuf *m) 4306 { 4307 4308 return (m->m_pkthdr.ether_vtag); 4309 } 4310 4311 int 4312 if_sendq_empty(if_t ifp) 4313 { 4314 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4315 } 4316 4317 struct ifaddr * 4318 if_getifaddr(if_t ifp) 4319 { 4320 return ((struct ifnet *)ifp)->if_addr; 4321 } 4322 4323 int 4324 if_getamcount(if_t ifp) 4325 { 4326 return ((struct ifnet *)ifp)->if_amcount; 4327 } 4328 4329 4330 int 4331 if_setsendqready(if_t ifp) 4332 { 4333 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4334 return (0); 4335 } 4336 4337 int 4338 if_setsendqlen(if_t ifp, int tx_desc_count) 4339 { 4340 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4341 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4342 4343 return (0); 4344 } 4345 4346 int 4347 if_vlantrunkinuse(if_t ifp) 4348 { 4349 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4350 } 4351 4352 int 4353 if_input(if_t ifp, struct mbuf* sendmp) 4354 { 4355 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4356 return (0); 4357 4358 } 4359 4360 /* XXX */ 4361 #ifndef ETH_ADDR_LEN 4362 #define ETH_ADDR_LEN 6 4363 #endif 4364 4365 int 4366 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4367 { 4368 struct ifmultiaddr *ifma; 4369 uint8_t *lmta = (uint8_t *)mta; 4370 int mcnt = 0; 4371 4372 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4373 if (ifma->ifma_addr->sa_family != AF_LINK) 4374 continue; 4375 4376 if (mcnt == max) 4377 break; 4378 4379 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4380 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4381 mcnt++; 4382 } 4383 *cnt = mcnt; 4384 4385 return (0); 4386 } 4387 4388 int 4389 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4390 { 4391 int error; 4392 4393 if_maddr_rlock(ifp); 4394 error = if_setupmultiaddr(ifp, mta, cnt, max); 4395 if_maddr_runlock(ifp); 4396 return (error); 4397 } 4398 4399 int 4400 if_multiaddr_count(if_t ifp, int max) 4401 { 4402 struct ifmultiaddr *ifma; 4403 int count; 4404 4405 count = 0; 4406 if_maddr_rlock(ifp); 4407 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4408 if (ifma->ifma_addr->sa_family != AF_LINK) 4409 continue; 4410 count++; 4411 if (count == max) 4412 break; 4413 } 4414 if_maddr_runlock(ifp); 4415 return (count); 4416 } 4417 4418 int 4419 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4420 { 4421 struct ifmultiaddr *ifma; 4422 int cnt = 0; 4423 4424 if_maddr_rlock(ifp); 4425 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4426 cnt += filter(arg, ifma, cnt); 4427 if_maddr_runlock(ifp); 4428 return (cnt); 4429 } 4430 4431 struct mbuf * 4432 if_dequeue(if_t ifp) 4433 { 4434 struct mbuf *m; 4435 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4436 4437 return (m); 4438 } 4439 4440 int 4441 if_sendq_prepend(if_t ifp, struct mbuf *m) 4442 { 4443 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4444 return (0); 4445 } 4446 4447 int 4448 if_setifheaderlen(if_t ifp, int len) 4449 { 4450 ((struct ifnet *)ifp)->if_hdrlen = len; 4451 return (0); 4452 } 4453 4454 caddr_t 4455 if_getlladdr(if_t ifp) 4456 { 4457 return (IF_LLADDR((struct ifnet *)ifp)); 4458 } 4459 4460 void * 4461 if_gethandle(u_char type) 4462 { 4463 return (if_alloc(type)); 4464 } 4465 4466 void 4467 if_bpfmtap(if_t ifh, struct mbuf *m) 4468 { 4469 struct ifnet *ifp = (struct ifnet *)ifh; 4470 4471 BPF_MTAP(ifp, m); 4472 } 4473 4474 void 4475 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4476 { 4477 struct ifnet *ifp = (struct ifnet *)ifh; 4478 4479 ETHER_BPF_MTAP(ifp, m); 4480 } 4481 4482 void 4483 if_vlancap(if_t ifh) 4484 { 4485 struct ifnet *ifp = (struct ifnet *)ifh; 4486 VLAN_CAPABILITIES(ifp); 4487 } 4488 4489 int 4490 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4491 { 4492 4493 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4494 return (0); 4495 } 4496 4497 int 4498 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4499 { 4500 4501 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4502 return (0); 4503 } 4504 4505 int 4506 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4507 { 4508 4509 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4510 return (0); 4511 } 4512 4513 u_int 4514 if_gethwtsomax(if_t ifp) 4515 { 4516 4517 return (((struct ifnet *)ifp)->if_hw_tsomax); 4518 } 4519 4520 u_int 4521 if_gethwtsomaxsegcount(if_t ifp) 4522 { 4523 4524 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4525 } 4526 4527 u_int 4528 if_gethwtsomaxsegsize(if_t ifp) 4529 { 4530 4531 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4532 } 4533 4534 void 4535 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4536 { 4537 ((struct ifnet *)ifp)->if_init = init_fn; 4538 } 4539 4540 void 4541 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4542 { 4543 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4544 } 4545 4546 void 4547 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4548 { 4549 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4550 } 4551 4552 void 4553 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4554 { 4555 ((struct ifnet *)ifp)->if_transmit = start_fn; 4556 } 4557 4558 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4559 { 4560 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4561 4562 } 4563 4564 void 4565 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4566 { 4567 4568 ifp->if_get_counter = fn; 4569 } 4570 4571 /* Revisit these - These are inline functions originally. */ 4572 int 4573 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4574 { 4575 return drbr_inuse(ifh, br); 4576 } 4577 4578 struct mbuf* 4579 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4580 { 4581 return drbr_dequeue(ifh, br); 4582 } 4583 4584 int 4585 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4586 { 4587 return drbr_needs_enqueue(ifh, br); 4588 } 4589 4590 int 4591 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4592 { 4593 return drbr_enqueue(ifh, br, m); 4594 4595 } 4596