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