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