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 static void * 492 if_grow(void) 493 { 494 int oldlim; 495 u_int n; 496 struct ifnet **e; 497 void *old; 498 499 old = NULL; 500 IFNET_WLOCK_ASSERT(); 501 oldlim = V_if_indexlim; 502 IFNET_WUNLOCK(); 503 n = (oldlim << 1) * sizeof(*e); 504 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 505 IFNET_WLOCK(); 506 if (V_if_indexlim != oldlim) { 507 free(e, M_IFNET); 508 return (NULL); 509 } 510 if (V_ifindex_table != NULL) { 511 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 512 old = V_ifindex_table; 513 } 514 V_if_indexlim <<= 1; 515 V_ifindex_table = e; 516 return (old); 517 } 518 519 /* 520 * Allocate a struct ifnet and an index for an interface. A layer 2 521 * common structure will also be allocated if an allocation routine is 522 * registered for the passed type. 523 */ 524 struct ifnet * 525 if_alloc_domain(u_char type, int numa_domain) 526 { 527 struct ifnet *ifp; 528 u_short idx; 529 void *old; 530 531 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 532 if (numa_domain == IF_NODOM) 533 ifp = malloc(sizeof(struct ifnet), M_IFNET, 534 M_WAITOK | M_ZERO); 535 else 536 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 537 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 538 restart: 539 IFNET_WLOCK(); 540 idx = ifindex_alloc(&old); 541 if (__predict_false(idx == USHRT_MAX)) { 542 IFNET_WUNLOCK(); 543 epoch_wait_preempt(net_epoch_preempt); 544 free(old, M_IFNET); 545 goto restart; 546 } 547 ifnet_setbyindex(idx, IFNET_HOLD); 548 IFNET_WUNLOCK(); 549 ifp->if_index = idx; 550 ifp->if_type = type; 551 ifp->if_alloctype = type; 552 ifp->if_numa_domain = numa_domain; 553 #ifdef VIMAGE 554 ifp->if_vnet = curvnet; 555 #endif 556 if (if_com_alloc[type] != NULL) { 557 ifp->if_l2com = if_com_alloc[type](type, ifp); 558 if (ifp->if_l2com == NULL) { 559 free(ifp, M_IFNET); 560 ifindex_free(idx); 561 return (NULL); 562 } 563 } 564 565 IF_ADDR_LOCK_INIT(ifp); 566 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 567 TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp); 568 ifp->if_afdata_initialized = 0; 569 IF_AFDATA_LOCK_INIT(ifp); 570 CK_STAILQ_INIT(&ifp->if_addrhead); 571 CK_STAILQ_INIT(&ifp->if_multiaddrs); 572 CK_STAILQ_INIT(&ifp->if_groups); 573 #ifdef MAC 574 mac_ifnet_init(ifp); 575 #endif 576 ifq_init(&ifp->if_snd, ifp); 577 578 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 579 for (int i = 0; i < IFCOUNTERS; i++) 580 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 581 ifp->if_get_counter = if_get_counter_default; 582 ifp->if_pcp = IFNET_PCP_NONE; 583 ifnet_setbyindex(ifp->if_index, ifp); 584 return (ifp); 585 } 586 587 struct ifnet * 588 if_alloc_dev(u_char type, device_t dev) 589 { 590 int numa_domain; 591 592 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 593 return (if_alloc_domain(type, IF_NODOM)); 594 return (if_alloc_domain(type, numa_domain)); 595 } 596 597 struct ifnet * 598 if_alloc(u_char type) 599 { 600 601 return (if_alloc_domain(type, IF_NODOM)); 602 } 603 /* 604 * Do the actual work of freeing a struct ifnet, and layer 2 common 605 * structure. This call is made when the last reference to an 606 * interface is released. 607 */ 608 static void 609 if_free_internal(struct ifnet *ifp) 610 { 611 612 KASSERT((ifp->if_flags & IFF_DYING), 613 ("if_free_internal: interface not dying")); 614 615 if (if_com_free[ifp->if_alloctype] != NULL) 616 if_com_free[ifp->if_alloctype](ifp->if_l2com, 617 ifp->if_alloctype); 618 619 #ifdef MAC 620 mac_ifnet_destroy(ifp); 621 #endif /* MAC */ 622 IF_AFDATA_DESTROY(ifp); 623 IF_ADDR_LOCK_DESTROY(ifp); 624 ifq_delete(&ifp->if_snd); 625 626 for (int i = 0; i < IFCOUNTERS; i++) 627 counter_u64_free(ifp->if_counters[i]); 628 629 free(ifp->if_description, M_IFDESCR); 630 free(ifp->if_hw_addr, M_IFADDR); 631 free(ifp, M_IFNET); 632 } 633 634 static void 635 if_destroy(epoch_context_t ctx) 636 { 637 struct ifnet *ifp; 638 639 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 640 if_free_internal(ifp); 641 } 642 643 /* 644 * Deregister an interface and free the associated storage. 645 */ 646 void 647 if_free(struct ifnet *ifp) 648 { 649 650 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 651 652 CURVNET_SET_QUIET(ifp->if_vnet); 653 IFNET_WLOCK(); 654 KASSERT(ifp == ifnet_byindex(ifp->if_index), 655 ("%s: freeing unallocated ifnet", ifp->if_xname)); 656 657 ifindex_free_locked(ifp->if_index); 658 IFNET_WUNLOCK(); 659 660 if (refcount_release(&ifp->if_refcount)) 661 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 662 CURVNET_RESTORE(); 663 } 664 665 /* 666 * Interfaces to keep an ifnet type-stable despite the possibility of the 667 * driver calling if_free(). If there are additional references, we defer 668 * freeing the underlying data structure. 669 */ 670 void 671 if_ref(struct ifnet *ifp) 672 { 673 674 /* We don't assert the ifnet list lock here, but arguably should. */ 675 refcount_acquire(&ifp->if_refcount); 676 } 677 678 void 679 if_rele(struct ifnet *ifp) 680 { 681 682 if (!refcount_release(&ifp->if_refcount)) 683 return; 684 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 685 } 686 687 void 688 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 689 { 690 691 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 692 693 if (ifq->ifq_maxlen == 0) 694 ifq->ifq_maxlen = ifqmaxlen; 695 696 ifq->altq_type = 0; 697 ifq->altq_disc = NULL; 698 ifq->altq_flags &= ALTQF_CANTCHANGE; 699 ifq->altq_tbr = NULL; 700 ifq->altq_ifp = ifp; 701 } 702 703 void 704 ifq_delete(struct ifaltq *ifq) 705 { 706 mtx_destroy(&ifq->ifq_mtx); 707 } 708 709 /* 710 * Perform generic interface initialization tasks and attach the interface 711 * to the list of "active" interfaces. If vmove flag is set on entry 712 * to if_attach_internal(), perform only a limited subset of initialization 713 * tasks, given that we are moving from one vnet to another an ifnet which 714 * has already been fully initialized. 715 * 716 * Note that if_detach_internal() removes group membership unconditionally 717 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 718 * Thus, when if_vmove() is applied to a cloned interface, group membership 719 * is lost while a cloned one always joins a group whose name is 720 * ifc->ifc_name. To recover this after if_detach_internal() and 721 * if_attach_internal(), the cloner should be specified to 722 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 723 * attempts to join a group whose name is ifc->ifc_name. 724 * 725 * XXX: 726 * - The decision to return void and thus require this function to 727 * succeed is questionable. 728 * - We should probably do more sanity checking. For instance we don't 729 * do anything to insure if_xname is unique or non-empty. 730 */ 731 void 732 if_attach(struct ifnet *ifp) 733 { 734 735 if_attach_internal(ifp, 0, NULL); 736 } 737 738 /* 739 * Compute the least common TSO limit. 740 */ 741 void 742 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 743 { 744 /* 745 * 1) If there is no limit currently, take the limit from 746 * the network adapter. 747 * 748 * 2) If the network adapter has a limit below the current 749 * limit, apply it. 750 */ 751 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 752 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 753 pmax->tsomaxbytes = ifp->if_hw_tsomax; 754 } 755 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 756 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 757 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 758 } 759 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 760 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 761 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 762 } 763 } 764 765 /* 766 * Update TSO limit of a network adapter. 767 * 768 * Returns zero if no change. Else non-zero. 769 */ 770 int 771 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 772 { 773 int retval = 0; 774 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 775 ifp->if_hw_tsomax = pmax->tsomaxbytes; 776 retval++; 777 } 778 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 779 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 780 retval++; 781 } 782 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 783 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 784 retval++; 785 } 786 return (retval); 787 } 788 789 static void 790 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 791 { 792 unsigned socksize, ifasize; 793 int namelen, masklen; 794 struct sockaddr_dl *sdl; 795 struct ifaddr *ifa; 796 797 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 798 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 799 ifp->if_xname); 800 801 #ifdef VIMAGE 802 ifp->if_vnet = curvnet; 803 if (ifp->if_home_vnet == NULL) 804 ifp->if_home_vnet = curvnet; 805 #endif 806 807 if_addgroup(ifp, IFG_ALL); 808 809 /* Restore group membership for cloned interfaces. */ 810 if (vmove && ifc != NULL) 811 if_clone_addgroup(ifp, ifc); 812 813 getmicrotime(&ifp->if_lastchange); 814 ifp->if_epoch = time_uptime; 815 816 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 817 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 818 ("transmit and qflush must both either be set or both be NULL")); 819 if (ifp->if_transmit == NULL) { 820 ifp->if_transmit = if_transmit; 821 ifp->if_qflush = if_qflush; 822 } 823 if (ifp->if_input == NULL) 824 ifp->if_input = if_input_default; 825 826 if (ifp->if_requestencap == NULL) 827 ifp->if_requestencap = if_requestencap_default; 828 829 if (!vmove) { 830 #ifdef MAC 831 mac_ifnet_create(ifp); 832 #endif 833 834 /* 835 * Create a Link Level name for this device. 836 */ 837 namelen = strlen(ifp->if_xname); 838 /* 839 * Always save enough space for any possiable name so we 840 * can do a rename in place later. 841 */ 842 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 843 socksize = masklen + ifp->if_addrlen; 844 if (socksize < sizeof(*sdl)) 845 socksize = sizeof(*sdl); 846 socksize = roundup2(socksize, sizeof(long)); 847 ifasize = sizeof(*ifa) + 2 * socksize; 848 ifa = ifa_alloc(ifasize, M_WAITOK); 849 sdl = (struct sockaddr_dl *)(ifa + 1); 850 sdl->sdl_len = socksize; 851 sdl->sdl_family = AF_LINK; 852 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 853 sdl->sdl_nlen = namelen; 854 sdl->sdl_index = ifp->if_index; 855 sdl->sdl_type = ifp->if_type; 856 ifp->if_addr = ifa; 857 ifa->ifa_ifp = ifp; 858 ifa->ifa_addr = (struct sockaddr *)sdl; 859 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 860 ifa->ifa_netmask = (struct sockaddr *)sdl; 861 sdl->sdl_len = masklen; 862 while (namelen != 0) 863 sdl->sdl_data[--namelen] = 0xff; 864 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 865 /* Reliably crash if used uninitialized. */ 866 ifp->if_broadcastaddr = NULL; 867 868 if (ifp->if_type == IFT_ETHER) { 869 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 870 M_WAITOK | M_ZERO); 871 } 872 873 #if defined(INET) || defined(INET6) 874 /* Use defaults for TSO, if nothing is set */ 875 if (ifp->if_hw_tsomax == 0 && 876 ifp->if_hw_tsomaxsegcount == 0 && 877 ifp->if_hw_tsomaxsegsize == 0) { 878 /* 879 * The TSO defaults needs to be such that an 880 * NFS mbuf list of 35 mbufs totalling just 881 * below 64K works and that a chain of mbufs 882 * can be defragged into at most 32 segments: 883 */ 884 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 885 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 886 ifp->if_hw_tsomaxsegcount = 35; 887 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 888 889 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 890 if (ifp->if_capabilities & IFCAP_TSO) { 891 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 892 ifp->if_hw_tsomax, 893 ifp->if_hw_tsomaxsegcount, 894 ifp->if_hw_tsomaxsegsize); 895 } 896 } 897 #endif 898 } 899 #ifdef VIMAGE 900 else { 901 /* 902 * Update the interface index in the link layer address 903 * of the interface. 904 */ 905 for (ifa = ifp->if_addr; ifa != NULL; 906 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 907 if (ifa->ifa_addr->sa_family == AF_LINK) { 908 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 909 sdl->sdl_index = ifp->if_index; 910 } 911 } 912 } 913 #endif 914 915 IFNET_WLOCK(); 916 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 917 #ifdef VIMAGE 918 curvnet->vnet_ifcnt++; 919 #endif 920 IFNET_WUNLOCK(); 921 922 if (domain_init_status >= 2) 923 if_attachdomain1(ifp); 924 925 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 926 if (IS_DEFAULT_VNET(curvnet)) 927 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 928 929 /* Announce the interface. */ 930 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 931 } 932 933 static void 934 if_epochalloc(void *dummy __unused) 935 { 936 937 net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT); 938 } 939 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL); 940 941 static void 942 if_attachdomain(void *dummy) 943 { 944 struct ifnet *ifp; 945 946 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 947 if_attachdomain1(ifp); 948 } 949 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 950 if_attachdomain, NULL); 951 952 static void 953 if_attachdomain1(struct ifnet *ifp) 954 { 955 struct domain *dp; 956 957 /* 958 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 959 * cannot lock ifp->if_afdata initialization, entirely. 960 */ 961 IF_AFDATA_LOCK(ifp); 962 if (ifp->if_afdata_initialized >= domain_init_status) { 963 IF_AFDATA_UNLOCK(ifp); 964 log(LOG_WARNING, "%s called more than once on %s\n", 965 __func__, ifp->if_xname); 966 return; 967 } 968 ifp->if_afdata_initialized = domain_init_status; 969 IF_AFDATA_UNLOCK(ifp); 970 971 /* address family dependent data region */ 972 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 973 for (dp = domains; dp; dp = dp->dom_next) { 974 if (dp->dom_ifattach) 975 ifp->if_afdata[dp->dom_family] = 976 (*dp->dom_ifattach)(ifp); 977 } 978 } 979 980 /* 981 * Remove any unicast or broadcast network addresses from an interface. 982 */ 983 void 984 if_purgeaddrs(struct ifnet *ifp) 985 { 986 struct ifaddr *ifa; 987 988 while (1) { 989 struct epoch_tracker et; 990 991 NET_EPOCH_ENTER(et); 992 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 993 if (ifa->ifa_addr->sa_family != AF_LINK) 994 break; 995 } 996 NET_EPOCH_EXIT(et); 997 998 if (ifa == NULL) 999 break; 1000 #ifdef INET 1001 /* XXX: Ugly!! ad hoc just for INET */ 1002 if (ifa->ifa_addr->sa_family == AF_INET) { 1003 struct ifaliasreq ifr; 1004 1005 bzero(&ifr, sizeof(ifr)); 1006 ifr.ifra_addr = *ifa->ifa_addr; 1007 if (ifa->ifa_dstaddr) 1008 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1009 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1010 NULL) == 0) 1011 continue; 1012 } 1013 #endif /* INET */ 1014 #ifdef INET6 1015 if (ifa->ifa_addr->sa_family == AF_INET6) { 1016 in6_purgeaddr(ifa); 1017 /* ifp_addrhead is already updated */ 1018 continue; 1019 } 1020 #endif /* INET6 */ 1021 IF_ADDR_WLOCK(ifp); 1022 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1023 IF_ADDR_WUNLOCK(ifp); 1024 ifa_free(ifa); 1025 } 1026 } 1027 1028 /* 1029 * Remove any multicast network addresses from an interface when an ifnet 1030 * is going away. 1031 */ 1032 static void 1033 if_purgemaddrs(struct ifnet *ifp) 1034 { 1035 struct ifmultiaddr *ifma; 1036 1037 IF_ADDR_WLOCK(ifp); 1038 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1039 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1040 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1041 if_delmulti_locked(ifp, ifma, 1); 1042 } 1043 IF_ADDR_WUNLOCK(ifp); 1044 } 1045 1046 /* 1047 * Detach an interface, removing it from the list of "active" interfaces. 1048 * If vmove flag is set on entry to if_detach_internal(), perform only a 1049 * limited subset of cleanup tasks, given that we are moving an ifnet from 1050 * one vnet to another, where it must be fully operational. 1051 * 1052 * XXXRW: There are some significant questions about event ordering, and 1053 * how to prevent things from starting to use the interface during detach. 1054 */ 1055 void 1056 if_detach(struct ifnet *ifp) 1057 { 1058 1059 CURVNET_SET_QUIET(ifp->if_vnet); 1060 if_detach_internal(ifp, 0, NULL); 1061 CURVNET_RESTORE(); 1062 } 1063 1064 /* 1065 * The vmove flag, if set, indicates that we are called from a callpath 1066 * that is moving an interface to a different vnet instance. 1067 * 1068 * The shutdown flag, if set, indicates that we are called in the 1069 * process of shutting down a vnet instance. Currently only the 1070 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1071 * on a vnet instance shutdown without this flag being set, e.g., when 1072 * the cloned interfaces are destoyed as first thing of teardown. 1073 */ 1074 static int 1075 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1076 { 1077 struct ifaddr *ifa; 1078 int i; 1079 struct domain *dp; 1080 struct ifnet *iter; 1081 int found = 0; 1082 #ifdef VIMAGE 1083 bool shutdown; 1084 1085 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1086 #endif 1087 IFNET_WLOCK(); 1088 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1089 if (iter == ifp) { 1090 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1091 if (!vmove) 1092 ifp->if_flags |= IFF_DYING; 1093 found = 1; 1094 break; 1095 } 1096 IFNET_WUNLOCK(); 1097 if (!found) { 1098 /* 1099 * While we would want to panic here, we cannot 1100 * guarantee that the interface is indeed still on 1101 * the list given we don't hold locks all the way. 1102 */ 1103 return (ENOENT); 1104 #if 0 1105 if (vmove) 1106 panic("%s: ifp=%p not on the ifnet tailq %p", 1107 __func__, ifp, &V_ifnet); 1108 else 1109 return; /* XXX this should panic as well? */ 1110 #endif 1111 } 1112 1113 /* 1114 * At this point we know the interface still was on the ifnet list 1115 * and we removed it so we are in a stable state. 1116 */ 1117 #ifdef VIMAGE 1118 curvnet->vnet_ifcnt--; 1119 #endif 1120 epoch_wait_preempt(net_epoch_preempt); 1121 1122 /* 1123 * Ensure all pending EPOCH(9) callbacks have been executed. This 1124 * fixes issues about late destruction of multicast options 1125 * which lead to leave group calls, which in turn access the 1126 * belonging ifnet structure: 1127 */ 1128 epoch_drain_callbacks(net_epoch_preempt); 1129 1130 /* 1131 * In any case (destroy or vmove) detach us from the groups 1132 * and remove/wait for pending events on the taskq. 1133 * XXX-BZ in theory an interface could still enqueue a taskq change? 1134 */ 1135 if_delgroups(ifp); 1136 1137 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1138 taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask); 1139 1140 /* 1141 * Check if this is a cloned interface or not. Must do even if 1142 * shutting down as a if_vmove_reclaim() would move the ifp and 1143 * the if_clone_addgroup() will have a corrupted string overwise 1144 * from a gibberish pointer. 1145 */ 1146 if (vmove && ifcp != NULL) 1147 *ifcp = if_clone_findifc(ifp); 1148 1149 if_down(ifp); 1150 1151 #ifdef VIMAGE 1152 /* 1153 * On VNET shutdown abort here as the stack teardown will do all 1154 * the work top-down for us. 1155 */ 1156 if (shutdown) { 1157 /* Give interface users the chance to clean up. */ 1158 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1159 1160 /* 1161 * In case of a vmove we are done here without error. 1162 * If we would signal an error it would lead to the same 1163 * abort as if we did not find the ifnet anymore. 1164 * if_detach() calls us in void context and does not care 1165 * about an early abort notification, so life is splendid :) 1166 */ 1167 goto finish_vnet_shutdown; 1168 } 1169 #endif 1170 1171 /* 1172 * At this point we are not tearing down a VNET and are either 1173 * going to destroy or vmove the interface and have to cleanup 1174 * accordingly. 1175 */ 1176 1177 /* 1178 * Remove routes and flush queues. 1179 */ 1180 #ifdef ALTQ 1181 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1182 altq_disable(&ifp->if_snd); 1183 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1184 altq_detach(&ifp->if_snd); 1185 #endif 1186 1187 if_purgeaddrs(ifp); 1188 1189 #ifdef INET 1190 in_ifdetach(ifp); 1191 #endif 1192 1193 #ifdef INET6 1194 /* 1195 * Remove all IPv6 kernel structs related to ifp. This should be done 1196 * before removing routing entries below, since IPv6 interface direct 1197 * routes are expected to be removed by the IPv6-specific kernel API. 1198 * Otherwise, the kernel will detect some inconsistency and bark it. 1199 */ 1200 in6_ifdetach(ifp); 1201 #endif 1202 if_purgemaddrs(ifp); 1203 1204 /* Announce that the interface is gone. */ 1205 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1206 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1207 if (IS_DEFAULT_VNET(curvnet)) 1208 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1209 1210 if (!vmove) { 1211 /* 1212 * Prevent further calls into the device driver via ifnet. 1213 */ 1214 if_dead(ifp); 1215 1216 /* 1217 * Clean up all addresses. 1218 */ 1219 IF_ADDR_WLOCK(ifp); 1220 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1221 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1222 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1223 IF_ADDR_WUNLOCK(ifp); 1224 ifa_free(ifa); 1225 } else 1226 IF_ADDR_WUNLOCK(ifp); 1227 } 1228 1229 rt_flushifroutes(ifp); 1230 1231 #ifdef VIMAGE 1232 finish_vnet_shutdown: 1233 #endif 1234 /* 1235 * We cannot hold the lock over dom_ifdetach calls as they might 1236 * sleep, for example trying to drain a callout, thus open up the 1237 * theoretical race with re-attaching. 1238 */ 1239 IF_AFDATA_LOCK(ifp); 1240 i = ifp->if_afdata_initialized; 1241 ifp->if_afdata_initialized = 0; 1242 IF_AFDATA_UNLOCK(ifp); 1243 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1244 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1245 (*dp->dom_ifdetach)(ifp, 1246 ifp->if_afdata[dp->dom_family]); 1247 ifp->if_afdata[dp->dom_family] = NULL; 1248 } 1249 } 1250 1251 return (0); 1252 } 1253 1254 #ifdef VIMAGE 1255 /* 1256 * if_vmove() performs a limited version of if_detach() in current 1257 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1258 * An attempt is made to shrink if_index in current vnet, find an 1259 * unused if_index in target vnet and calls if_grow() if necessary, 1260 * and finally find an unused if_xname for the target vnet. 1261 */ 1262 static int 1263 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1264 { 1265 struct if_clone *ifc; 1266 #ifdef DEV_BPF 1267 u_int bif_dlt, bif_hdrlen; 1268 #endif 1269 void *old; 1270 int rc; 1271 1272 #ifdef DEV_BPF 1273 /* 1274 * if_detach_internal() will call the eventhandler to notify 1275 * interface departure. That will detach if_bpf. We need to 1276 * safe the dlt and hdrlen so we can re-attach it later. 1277 */ 1278 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1279 #endif 1280 1281 /* 1282 * Detach from current vnet, but preserve LLADDR info, do not 1283 * mark as dead etc. so that the ifnet can be reattached later. 1284 * If we cannot find it, we lost the race to someone else. 1285 */ 1286 rc = if_detach_internal(ifp, 1, &ifc); 1287 if (rc != 0) 1288 return (rc); 1289 1290 /* 1291 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1292 * the if_index for that vnet if possible. 1293 * 1294 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1295 * or we'd lock on one vnet and unlock on another. 1296 */ 1297 IFNET_WLOCK(); 1298 ifindex_free_locked(ifp->if_index); 1299 IFNET_WUNLOCK(); 1300 1301 1302 /* Don't re-attach DYING interfaces. */ 1303 if (ifp->if_flags & IFF_DYING) 1304 return (0); 1305 1306 /* 1307 * Perform interface-specific reassignment tasks, if provided by 1308 * the driver. 1309 */ 1310 if (ifp->if_reassign != NULL) 1311 ifp->if_reassign(ifp, new_vnet, NULL); 1312 1313 /* 1314 * Switch to the context of the target vnet. 1315 */ 1316 CURVNET_SET_QUIET(new_vnet); 1317 restart: 1318 IFNET_WLOCK(); 1319 ifp->if_index = ifindex_alloc(&old); 1320 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1321 IFNET_WUNLOCK(); 1322 epoch_wait_preempt(net_epoch_preempt); 1323 free(old, M_IFNET); 1324 goto restart; 1325 } 1326 ifnet_setbyindex(ifp->if_index, ifp); 1327 IFNET_WUNLOCK(); 1328 1329 if_attach_internal(ifp, 1, ifc); 1330 1331 #ifdef DEV_BPF 1332 if (ifp->if_bpf == NULL) 1333 bpfattach(ifp, bif_dlt, bif_hdrlen); 1334 #endif 1335 1336 CURVNET_RESTORE(); 1337 return (0); 1338 } 1339 1340 /* 1341 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1342 */ 1343 static int 1344 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1345 { 1346 struct prison *pr; 1347 struct ifnet *difp; 1348 int error; 1349 bool shutdown; 1350 1351 /* Try to find the prison within our visibility. */ 1352 sx_slock(&allprison_lock); 1353 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1354 sx_sunlock(&allprison_lock); 1355 if (pr == NULL) 1356 return (ENXIO); 1357 prison_hold_locked(pr); 1358 mtx_unlock(&pr->pr_mtx); 1359 1360 /* Do not try to move the iface from and to the same prison. */ 1361 if (pr->pr_vnet == ifp->if_vnet) { 1362 prison_free(pr); 1363 return (EEXIST); 1364 } 1365 1366 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1367 /* XXX Lock interfaces to avoid races. */ 1368 CURVNET_SET_QUIET(pr->pr_vnet); 1369 difp = ifunit(ifname); 1370 if (difp != NULL) { 1371 CURVNET_RESTORE(); 1372 prison_free(pr); 1373 return (EEXIST); 1374 } 1375 1376 /* Make sure the VNET is stable. */ 1377 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1378 if (shutdown) { 1379 CURVNET_RESTORE(); 1380 prison_free(pr); 1381 return (EBUSY); 1382 } 1383 CURVNET_RESTORE(); 1384 1385 /* Move the interface into the child jail/vnet. */ 1386 error = if_vmove(ifp, pr->pr_vnet); 1387 1388 /* Report the new if_xname back to the userland on success. */ 1389 if (error == 0) 1390 sprintf(ifname, "%s", ifp->if_xname); 1391 1392 prison_free(pr); 1393 return (error); 1394 } 1395 1396 static int 1397 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1398 { 1399 struct prison *pr; 1400 struct vnet *vnet_dst; 1401 struct ifnet *ifp; 1402 int error; 1403 bool shutdown; 1404 1405 /* Try to find the prison within our visibility. */ 1406 sx_slock(&allprison_lock); 1407 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1408 sx_sunlock(&allprison_lock); 1409 if (pr == NULL) 1410 return (ENXIO); 1411 prison_hold_locked(pr); 1412 mtx_unlock(&pr->pr_mtx); 1413 1414 /* Make sure the named iface exists in the source prison/vnet. */ 1415 CURVNET_SET(pr->pr_vnet); 1416 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1417 if (ifp == NULL) { 1418 CURVNET_RESTORE(); 1419 prison_free(pr); 1420 return (ENXIO); 1421 } 1422 1423 /* Do not try to move the iface from and to the same prison. */ 1424 vnet_dst = TD_TO_VNET(td); 1425 if (vnet_dst == ifp->if_vnet) { 1426 CURVNET_RESTORE(); 1427 prison_free(pr); 1428 return (EEXIST); 1429 } 1430 1431 /* Make sure the VNET is stable. */ 1432 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1433 if (shutdown) { 1434 CURVNET_RESTORE(); 1435 prison_free(pr); 1436 return (EBUSY); 1437 } 1438 1439 /* Get interface back from child jail/vnet. */ 1440 error = if_vmove(ifp, vnet_dst); 1441 CURVNET_RESTORE(); 1442 1443 /* Report the new if_xname back to the userland on success. */ 1444 if (error == 0) 1445 sprintf(ifname, "%s", ifp->if_xname); 1446 1447 prison_free(pr); 1448 return (error); 1449 } 1450 #endif /* VIMAGE */ 1451 1452 /* 1453 * Add a group to an interface 1454 */ 1455 int 1456 if_addgroup(struct ifnet *ifp, const char *groupname) 1457 { 1458 struct ifg_list *ifgl; 1459 struct ifg_group *ifg = NULL; 1460 struct ifg_member *ifgm; 1461 int new = 0; 1462 1463 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1464 groupname[strlen(groupname) - 1] <= '9') 1465 return (EINVAL); 1466 1467 IFNET_WLOCK(); 1468 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1469 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1470 IFNET_WUNLOCK(); 1471 return (EEXIST); 1472 } 1473 1474 if ((ifgl = malloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) { 1475 IFNET_WUNLOCK(); 1476 return (ENOMEM); 1477 } 1478 1479 if ((ifgm = malloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) { 1480 free(ifgl, M_TEMP); 1481 IFNET_WUNLOCK(); 1482 return (ENOMEM); 1483 } 1484 1485 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1486 if (!strcmp(ifg->ifg_group, groupname)) 1487 break; 1488 1489 if (ifg == NULL) { 1490 if ((ifg = malloc(sizeof(*ifg), M_TEMP, M_NOWAIT)) == NULL) { 1491 free(ifgl, M_TEMP); 1492 free(ifgm, M_TEMP); 1493 IFNET_WUNLOCK(); 1494 return (ENOMEM); 1495 } 1496 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1497 ifg->ifg_refcnt = 0; 1498 CK_STAILQ_INIT(&ifg->ifg_members); 1499 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1500 new = 1; 1501 } 1502 1503 ifg->ifg_refcnt++; 1504 ifgl->ifgl_group = ifg; 1505 ifgm->ifgm_ifp = ifp; 1506 1507 IF_ADDR_WLOCK(ifp); 1508 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1509 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1510 IF_ADDR_WUNLOCK(ifp); 1511 1512 IFNET_WUNLOCK(); 1513 1514 if (new) 1515 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1516 EVENTHANDLER_INVOKE(group_change_event, groupname); 1517 1518 return (0); 1519 } 1520 1521 /* 1522 * Helper function to remove a group out of an interface. Expects the global 1523 * ifnet lock to be write-locked, and drops it before returning. 1524 */ 1525 static void 1526 _if_delgroup_locked(struct ifnet *ifp, struct ifg_list *ifgl, 1527 const char *groupname) 1528 { 1529 struct ifg_member *ifgm; 1530 bool freeifgl; 1531 1532 IFNET_WLOCK_ASSERT(); 1533 1534 IF_ADDR_WLOCK(ifp); 1535 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1536 IF_ADDR_WUNLOCK(ifp); 1537 1538 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) { 1539 if (ifgm->ifgm_ifp == ifp) { 1540 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1541 ifg_member, ifgm_next); 1542 break; 1543 } 1544 } 1545 1546 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1547 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, 1548 ifg_next); 1549 freeifgl = true; 1550 } else { 1551 freeifgl = false; 1552 } 1553 IFNET_WUNLOCK(); 1554 1555 epoch_wait_preempt(net_epoch_preempt); 1556 if (freeifgl) { 1557 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1558 free(ifgl->ifgl_group, M_TEMP); 1559 } 1560 free(ifgm, M_TEMP); 1561 free(ifgl, M_TEMP); 1562 1563 EVENTHANDLER_INVOKE(group_change_event, groupname); 1564 } 1565 1566 /* 1567 * Remove a group from an interface 1568 */ 1569 int 1570 if_delgroup(struct ifnet *ifp, const char *groupname) 1571 { 1572 struct ifg_list *ifgl; 1573 1574 IFNET_WLOCK(); 1575 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1576 if (strcmp(ifgl->ifgl_group->ifg_group, groupname) == 0) 1577 break; 1578 if (ifgl == NULL) { 1579 IFNET_WUNLOCK(); 1580 return (ENOENT); 1581 } 1582 1583 _if_delgroup_locked(ifp, ifgl, groupname); 1584 1585 return (0); 1586 } 1587 1588 /* 1589 * Remove an interface from all groups 1590 */ 1591 static void 1592 if_delgroups(struct ifnet *ifp) 1593 { 1594 struct ifg_list *ifgl; 1595 char groupname[IFNAMSIZ]; 1596 1597 IFNET_WLOCK(); 1598 while ((ifgl = CK_STAILQ_FIRST(&ifp->if_groups)) != NULL) { 1599 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1600 _if_delgroup_locked(ifp, ifgl, groupname); 1601 IFNET_WLOCK(); 1602 } 1603 IFNET_WUNLOCK(); 1604 } 1605 1606 static char * 1607 ifgr_group_get(void *ifgrp) 1608 { 1609 union ifgroupreq_union *ifgrup; 1610 1611 ifgrup = ifgrp; 1612 #ifdef COMPAT_FREEBSD32 1613 if (SV_CURPROC_FLAG(SV_ILP32)) 1614 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1615 #endif 1616 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1617 } 1618 1619 static struct ifg_req * 1620 ifgr_groups_get(void *ifgrp) 1621 { 1622 union ifgroupreq_union *ifgrup; 1623 1624 ifgrup = ifgrp; 1625 #ifdef COMPAT_FREEBSD32 1626 if (SV_CURPROC_FLAG(SV_ILP32)) 1627 return ((struct ifg_req *)(uintptr_t) 1628 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1629 #endif 1630 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1631 } 1632 1633 /* 1634 * Stores all groups from an interface in memory pointed to by ifgr. 1635 */ 1636 static int 1637 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1638 { 1639 int len, error; 1640 struct ifg_list *ifgl; 1641 struct ifg_req ifgrq, *ifgp; 1642 1643 NET_EPOCH_ASSERT(); 1644 1645 if (ifgr->ifgr_len == 0) { 1646 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1647 ifgr->ifgr_len += sizeof(struct ifg_req); 1648 return (0); 1649 } 1650 1651 len = ifgr->ifgr_len; 1652 ifgp = ifgr_groups_get(ifgr); 1653 /* XXX: wire */ 1654 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1655 if (len < sizeof(ifgrq)) 1656 return (EINVAL); 1657 bzero(&ifgrq, sizeof ifgrq); 1658 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1659 sizeof(ifgrq.ifgrq_group)); 1660 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) 1661 return (error); 1662 len -= sizeof(ifgrq); 1663 ifgp++; 1664 } 1665 1666 return (0); 1667 } 1668 1669 /* 1670 * Stores all members of a group in memory pointed to by igfr 1671 */ 1672 static int 1673 if_getgroupmembers(struct ifgroupreq *ifgr) 1674 { 1675 struct ifg_group *ifg; 1676 struct ifg_member *ifgm; 1677 struct ifg_req ifgrq, *ifgp; 1678 int len, error; 1679 1680 IFNET_RLOCK(); 1681 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1682 if (strcmp(ifg->ifg_group, ifgr->ifgr_name) == 0) 1683 break; 1684 if (ifg == NULL) { 1685 IFNET_RUNLOCK(); 1686 return (ENOENT); 1687 } 1688 1689 if (ifgr->ifgr_len == 0) { 1690 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1691 ifgr->ifgr_len += sizeof(ifgrq); 1692 IFNET_RUNLOCK(); 1693 return (0); 1694 } 1695 1696 len = ifgr->ifgr_len; 1697 ifgp = ifgr_groups_get(ifgr); 1698 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1699 if (len < sizeof(ifgrq)) { 1700 IFNET_RUNLOCK(); 1701 return (EINVAL); 1702 } 1703 bzero(&ifgrq, sizeof ifgrq); 1704 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1705 sizeof(ifgrq.ifgrq_member)); 1706 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1707 IFNET_RUNLOCK(); 1708 return (error); 1709 } 1710 len -= sizeof(ifgrq); 1711 ifgp++; 1712 } 1713 IFNET_RUNLOCK(); 1714 1715 return (0); 1716 } 1717 1718 /* 1719 * Return counter values from counter(9)s stored in ifnet. 1720 */ 1721 uint64_t 1722 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1723 { 1724 1725 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1726 1727 return (counter_u64_fetch(ifp->if_counters[cnt])); 1728 } 1729 1730 /* 1731 * Increase an ifnet counter. Usually used for counters shared 1732 * between the stack and a driver, but function supports them all. 1733 */ 1734 void 1735 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1736 { 1737 1738 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1739 1740 counter_u64_add(ifp->if_counters[cnt], inc); 1741 } 1742 1743 /* 1744 * Copy data from ifnet to userland API structure if_data. 1745 */ 1746 void 1747 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1748 { 1749 1750 ifd->ifi_type = ifp->if_type; 1751 ifd->ifi_physical = 0; 1752 ifd->ifi_addrlen = ifp->if_addrlen; 1753 ifd->ifi_hdrlen = ifp->if_hdrlen; 1754 ifd->ifi_link_state = ifp->if_link_state; 1755 ifd->ifi_vhid = 0; 1756 ifd->ifi_datalen = sizeof(struct if_data); 1757 ifd->ifi_mtu = ifp->if_mtu; 1758 ifd->ifi_metric = ifp->if_metric; 1759 ifd->ifi_baudrate = ifp->if_baudrate; 1760 ifd->ifi_hwassist = ifp->if_hwassist; 1761 ifd->ifi_epoch = ifp->if_epoch; 1762 ifd->ifi_lastchange = ifp->if_lastchange; 1763 1764 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1765 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1766 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1767 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1768 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1769 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1770 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1771 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1772 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1773 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1774 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1775 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1776 } 1777 1778 /* 1779 * Initialization, destruction and refcounting functions for ifaddrs. 1780 */ 1781 struct ifaddr * 1782 ifa_alloc(size_t size, int flags) 1783 { 1784 struct ifaddr *ifa; 1785 1786 KASSERT(size >= sizeof(struct ifaddr), 1787 ("%s: invalid size %zu", __func__, size)); 1788 1789 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1790 if (ifa == NULL) 1791 return (NULL); 1792 1793 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1794 goto fail; 1795 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1796 goto fail; 1797 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1798 goto fail; 1799 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1800 goto fail; 1801 1802 refcount_init(&ifa->ifa_refcnt, 1); 1803 1804 return (ifa); 1805 1806 fail: 1807 /* free(NULL) is okay */ 1808 counter_u64_free(ifa->ifa_opackets); 1809 counter_u64_free(ifa->ifa_ipackets); 1810 counter_u64_free(ifa->ifa_obytes); 1811 counter_u64_free(ifa->ifa_ibytes); 1812 free(ifa, M_IFADDR); 1813 1814 return (NULL); 1815 } 1816 1817 void 1818 ifa_ref(struct ifaddr *ifa) 1819 { 1820 1821 refcount_acquire(&ifa->ifa_refcnt); 1822 } 1823 1824 static void 1825 ifa_destroy(epoch_context_t ctx) 1826 { 1827 struct ifaddr *ifa; 1828 1829 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1830 counter_u64_free(ifa->ifa_opackets); 1831 counter_u64_free(ifa->ifa_ipackets); 1832 counter_u64_free(ifa->ifa_obytes); 1833 counter_u64_free(ifa->ifa_ibytes); 1834 free(ifa, M_IFADDR); 1835 } 1836 1837 void 1838 ifa_free(struct ifaddr *ifa) 1839 { 1840 1841 if (refcount_release(&ifa->ifa_refcnt)) 1842 NET_EPOCH_CALL(ifa_destroy, &ifa->ifa_epoch_ctx); 1843 } 1844 1845 static int 1846 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1847 struct sockaddr *ia) 1848 { 1849 struct rib_cmd_info rc; 1850 struct epoch_tracker et; 1851 int error; 1852 struct rt_addrinfo info; 1853 struct sockaddr_dl null_sdl; 1854 struct ifnet *ifp; 1855 struct ifaddr *rti_ifa = NULL; 1856 1857 ifp = ifa->ifa_ifp; 1858 1859 NET_EPOCH_ENTER(et); 1860 bzero(&info, sizeof(info)); 1861 if (cmd != RTM_DELETE) 1862 info.rti_ifp = V_loif; 1863 if (cmd == RTM_ADD) { 1864 /* explicitly specify (loopback) ifa */ 1865 if (info.rti_ifp != NULL) { 1866 rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1867 if (rti_ifa != NULL) 1868 ifa_ref(rti_ifa); 1869 info.rti_ifa = rti_ifa; 1870 } 1871 } 1872 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1873 info.rti_info[RTAX_DST] = ia; 1874 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1875 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1876 1877 error = rib_action(ifp->if_fib, cmd, &info, &rc); 1878 NET_EPOCH_EXIT(et); 1879 1880 if (rti_ifa != NULL) 1881 ifa_free(rti_ifa); 1882 1883 if (error == 0 || 1884 (cmd == RTM_ADD && error == EEXIST) || 1885 (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH))) 1886 return (error); 1887 1888 log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n", 1889 __func__, otype, if_name(ifp), error); 1890 1891 return (error); 1892 } 1893 1894 int 1895 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1896 { 1897 1898 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1899 } 1900 1901 int 1902 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1903 { 1904 1905 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1906 } 1907 1908 int 1909 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1910 { 1911 1912 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1913 } 1914 1915 /* 1916 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1917 * structs used to represent other address families, it is necessary 1918 * to perform a different comparison. 1919 */ 1920 1921 #define sa_dl_equal(a1, a2) \ 1922 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1923 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1924 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1925 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1926 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1927 1928 /* 1929 * Locate an interface based on a complete address. 1930 */ 1931 /*ARGSUSED*/ 1932 struct ifaddr * 1933 ifa_ifwithaddr(const struct sockaddr *addr) 1934 { 1935 struct ifnet *ifp; 1936 struct ifaddr *ifa; 1937 1938 NET_EPOCH_ASSERT(); 1939 1940 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1941 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1942 if (ifa->ifa_addr->sa_family != addr->sa_family) 1943 continue; 1944 if (sa_equal(addr, ifa->ifa_addr)) { 1945 goto done; 1946 } 1947 /* IP6 doesn't have broadcast */ 1948 if ((ifp->if_flags & IFF_BROADCAST) && 1949 ifa->ifa_broadaddr && 1950 ifa->ifa_broadaddr->sa_len != 0 && 1951 sa_equal(ifa->ifa_broadaddr, addr)) { 1952 goto done; 1953 } 1954 } 1955 } 1956 ifa = NULL; 1957 done: 1958 return (ifa); 1959 } 1960 1961 int 1962 ifa_ifwithaddr_check(const struct sockaddr *addr) 1963 { 1964 struct epoch_tracker et; 1965 int rc; 1966 1967 NET_EPOCH_ENTER(et); 1968 rc = (ifa_ifwithaddr(addr) != NULL); 1969 NET_EPOCH_EXIT(et); 1970 return (rc); 1971 } 1972 1973 /* 1974 * Locate an interface based on the broadcast address. 1975 */ 1976 /* ARGSUSED */ 1977 struct ifaddr * 1978 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1979 { 1980 struct ifnet *ifp; 1981 struct ifaddr *ifa; 1982 1983 NET_EPOCH_ASSERT(); 1984 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1985 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1986 continue; 1987 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1988 if (ifa->ifa_addr->sa_family != addr->sa_family) 1989 continue; 1990 if ((ifp->if_flags & IFF_BROADCAST) && 1991 ifa->ifa_broadaddr && 1992 ifa->ifa_broadaddr->sa_len != 0 && 1993 sa_equal(ifa->ifa_broadaddr, addr)) { 1994 goto done; 1995 } 1996 } 1997 } 1998 ifa = NULL; 1999 done: 2000 return (ifa); 2001 } 2002 2003 /* 2004 * Locate the point to point interface with a given destination address. 2005 */ 2006 /*ARGSUSED*/ 2007 struct ifaddr * 2008 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2009 { 2010 struct ifnet *ifp; 2011 struct ifaddr *ifa; 2012 2013 NET_EPOCH_ASSERT(); 2014 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2015 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2016 continue; 2017 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2018 continue; 2019 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2020 if (ifa->ifa_addr->sa_family != addr->sa_family) 2021 continue; 2022 if (ifa->ifa_dstaddr != NULL && 2023 sa_equal(addr, ifa->ifa_dstaddr)) { 2024 goto done; 2025 } 2026 } 2027 } 2028 ifa = NULL; 2029 done: 2030 return (ifa); 2031 } 2032 2033 /* 2034 * Find an interface on a specific network. If many, choice 2035 * is most specific found. 2036 */ 2037 struct ifaddr * 2038 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2039 { 2040 struct ifnet *ifp; 2041 struct ifaddr *ifa; 2042 struct ifaddr *ifa_maybe = NULL; 2043 u_int af = addr->sa_family; 2044 const char *addr_data = addr->sa_data, *cplim; 2045 2046 NET_EPOCH_ASSERT(); 2047 /* 2048 * AF_LINK addresses can be looked up directly by their index number, 2049 * so do that if we can. 2050 */ 2051 if (af == AF_LINK) { 2052 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2053 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2054 return (ifaddr_byindex(sdl->sdl_index)); 2055 } 2056 2057 /* 2058 * Scan though each interface, looking for ones that have addresses 2059 * in this address family and the requested fib. 2060 */ 2061 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2062 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2063 continue; 2064 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2065 const char *cp, *cp2, *cp3; 2066 2067 if (ifa->ifa_addr->sa_family != af) 2068 next: continue; 2069 if (af == AF_INET && 2070 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2071 /* 2072 * This is a bit broken as it doesn't 2073 * take into account that the remote end may 2074 * be a single node in the network we are 2075 * looking for. 2076 * The trouble is that we don't know the 2077 * netmask for the remote end. 2078 */ 2079 if (ifa->ifa_dstaddr != NULL && 2080 sa_equal(addr, ifa->ifa_dstaddr)) { 2081 goto done; 2082 } 2083 } else { 2084 /* 2085 * Scan all the bits in the ifa's address. 2086 * If a bit dissagrees with what we are 2087 * looking for, mask it with the netmask 2088 * to see if it really matters. 2089 * (A byte at a time) 2090 */ 2091 if (ifa->ifa_netmask == 0) 2092 continue; 2093 cp = addr_data; 2094 cp2 = ifa->ifa_addr->sa_data; 2095 cp3 = ifa->ifa_netmask->sa_data; 2096 cplim = ifa->ifa_netmask->sa_len 2097 + (char *)ifa->ifa_netmask; 2098 while (cp3 < cplim) 2099 if ((*cp++ ^ *cp2++) & *cp3++) 2100 goto next; /* next address! */ 2101 /* 2102 * If the netmask of what we just found 2103 * is more specific than what we had before 2104 * (if we had one), or if the virtual status 2105 * of new prefix is better than of the old one, 2106 * then remember the new one before continuing 2107 * to search for an even better one. 2108 */ 2109 if (ifa_maybe == NULL || 2110 ifa_preferred(ifa_maybe, ifa) || 2111 rn_refines((caddr_t)ifa->ifa_netmask, 2112 (caddr_t)ifa_maybe->ifa_netmask)) { 2113 ifa_maybe = ifa; 2114 } 2115 } 2116 } 2117 } 2118 ifa = ifa_maybe; 2119 ifa_maybe = NULL; 2120 done: 2121 return (ifa); 2122 } 2123 2124 /* 2125 * Find an interface address specific to an interface best matching 2126 * a given address. 2127 */ 2128 struct ifaddr * 2129 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2130 { 2131 struct ifaddr *ifa; 2132 const char *cp, *cp2, *cp3; 2133 char *cplim; 2134 struct ifaddr *ifa_maybe = NULL; 2135 u_int af = addr->sa_family; 2136 2137 if (af >= AF_MAX) 2138 return (NULL); 2139 2140 NET_EPOCH_ASSERT(); 2141 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2142 if (ifa->ifa_addr->sa_family != af) 2143 continue; 2144 if (ifa_maybe == NULL) 2145 ifa_maybe = ifa; 2146 if (ifa->ifa_netmask == 0) { 2147 if (sa_equal(addr, ifa->ifa_addr) || 2148 (ifa->ifa_dstaddr && 2149 sa_equal(addr, ifa->ifa_dstaddr))) 2150 goto done; 2151 continue; 2152 } 2153 if (ifp->if_flags & IFF_POINTOPOINT) { 2154 if (sa_equal(addr, ifa->ifa_dstaddr)) 2155 goto done; 2156 } else { 2157 cp = addr->sa_data; 2158 cp2 = ifa->ifa_addr->sa_data; 2159 cp3 = ifa->ifa_netmask->sa_data; 2160 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2161 for (; cp3 < cplim; cp3++) 2162 if ((*cp++ ^ *cp2++) & *cp3) 2163 break; 2164 if (cp3 == cplim) 2165 goto done; 2166 } 2167 } 2168 ifa = ifa_maybe; 2169 done: 2170 return (ifa); 2171 } 2172 2173 /* 2174 * See whether new ifa is better than current one: 2175 * 1) A non-virtual one is preferred over virtual. 2176 * 2) A virtual in master state preferred over any other state. 2177 * 2178 * Used in several address selecting functions. 2179 */ 2180 int 2181 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2182 { 2183 2184 return (cur->ifa_carp && (!next->ifa_carp || 2185 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2186 } 2187 2188 struct sockaddr_dl * 2189 link_alloc_sdl(size_t size, int flags) 2190 { 2191 2192 return (malloc(size, M_TEMP, flags)); 2193 } 2194 2195 void 2196 link_free_sdl(struct sockaddr *sa) 2197 { 2198 free(sa, M_TEMP); 2199 } 2200 2201 /* 2202 * Fills in given sdl with interface basic info. 2203 * Returns pointer to filled sdl. 2204 */ 2205 struct sockaddr_dl * 2206 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2207 { 2208 struct sockaddr_dl *sdl; 2209 2210 sdl = (struct sockaddr_dl *)paddr; 2211 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2212 sdl->sdl_len = sizeof(struct sockaddr_dl); 2213 sdl->sdl_family = AF_LINK; 2214 sdl->sdl_index = ifp->if_index; 2215 sdl->sdl_type = iftype; 2216 2217 return (sdl); 2218 } 2219 2220 /* 2221 * Mark an interface down and notify protocols of 2222 * the transition. 2223 */ 2224 static void 2225 if_unroute(struct ifnet *ifp, int flag, int fam) 2226 { 2227 struct ifaddr *ifa; 2228 2229 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2230 2231 ifp->if_flags &= ~flag; 2232 getmicrotime(&ifp->if_lastchange); 2233 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2234 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2235 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2236 ifp->if_qflush(ifp); 2237 2238 if (ifp->if_carp) 2239 (*carp_linkstate_p)(ifp); 2240 rt_ifmsg(ifp); 2241 } 2242 2243 /* 2244 * Mark an interface up and notify protocols of 2245 * the transition. 2246 */ 2247 static void 2248 if_route(struct ifnet *ifp, int flag, int fam) 2249 { 2250 struct ifaddr *ifa; 2251 2252 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2253 2254 ifp->if_flags |= flag; 2255 getmicrotime(&ifp->if_lastchange); 2256 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2257 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2258 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2259 if (ifp->if_carp) 2260 (*carp_linkstate_p)(ifp); 2261 rt_ifmsg(ifp); 2262 #ifdef INET6 2263 in6_if_up(ifp); 2264 #endif 2265 } 2266 2267 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2268 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2269 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2270 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2271 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2272 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2273 int (*vlan_setcookie_p)(struct ifnet *, void *); 2274 void *(*vlan_cookie_p)(struct ifnet *); 2275 2276 /* 2277 * Handle a change in the interface link state. To avoid LORs 2278 * between driver lock and upper layer locks, as well as possible 2279 * recursions, we post event to taskqueue, and all job 2280 * is done in static do_link_state_change(). 2281 */ 2282 void 2283 if_link_state_change(struct ifnet *ifp, int link_state) 2284 { 2285 /* Return if state hasn't changed. */ 2286 if (ifp->if_link_state == link_state) 2287 return; 2288 2289 ifp->if_link_state = link_state; 2290 2291 /* XXXGL: reference ifp? */ 2292 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2293 } 2294 2295 static void 2296 do_link_state_change(void *arg, int pending) 2297 { 2298 struct ifnet *ifp; 2299 int link_state; 2300 2301 ifp = arg; 2302 link_state = ifp->if_link_state; 2303 2304 CURVNET_SET(ifp->if_vnet); 2305 rt_ifmsg(ifp); 2306 if (ifp->if_vlantrunk != NULL) 2307 (*vlan_link_state_p)(ifp); 2308 2309 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2310 ifp->if_l2com != NULL) 2311 (*ng_ether_link_state_p)(ifp, link_state); 2312 if (ifp->if_carp) 2313 (*carp_linkstate_p)(ifp); 2314 if (ifp->if_bridge) 2315 ifp->if_bridge_linkstate(ifp); 2316 if (ifp->if_lagg) 2317 (*lagg_linkstate_p)(ifp, link_state); 2318 2319 if (IS_DEFAULT_VNET(curvnet)) 2320 devctl_notify("IFNET", ifp->if_xname, 2321 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2322 NULL); 2323 if (pending > 1) 2324 if_printf(ifp, "%d link states coalesced\n", pending); 2325 if (log_link_state_change) 2326 if_printf(ifp, "link state changed to %s\n", 2327 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2328 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2329 CURVNET_RESTORE(); 2330 } 2331 2332 /* 2333 * Mark an interface down and notify protocols of 2334 * the transition. 2335 */ 2336 void 2337 if_down(struct ifnet *ifp) 2338 { 2339 2340 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2341 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2342 } 2343 2344 /* 2345 * Mark an interface up and notify protocols of 2346 * the transition. 2347 */ 2348 void 2349 if_up(struct ifnet *ifp) 2350 { 2351 2352 if_route(ifp, IFF_UP, AF_UNSPEC); 2353 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2354 } 2355 2356 /* 2357 * Flush an interface queue. 2358 */ 2359 void 2360 if_qflush(struct ifnet *ifp) 2361 { 2362 struct mbuf *m, *n; 2363 struct ifaltq *ifq; 2364 2365 ifq = &ifp->if_snd; 2366 IFQ_LOCK(ifq); 2367 #ifdef ALTQ 2368 if (ALTQ_IS_ENABLED(ifq)) 2369 ALTQ_PURGE(ifq); 2370 #endif 2371 n = ifq->ifq_head; 2372 while ((m = n) != NULL) { 2373 n = m->m_nextpkt; 2374 m_freem(m); 2375 } 2376 ifq->ifq_head = 0; 2377 ifq->ifq_tail = 0; 2378 ifq->ifq_len = 0; 2379 IFQ_UNLOCK(ifq); 2380 } 2381 2382 /* 2383 * Map interface name to interface structure pointer, with or without 2384 * returning a reference. 2385 */ 2386 struct ifnet * 2387 ifunit_ref(const char *name) 2388 { 2389 struct epoch_tracker et; 2390 struct ifnet *ifp; 2391 2392 NET_EPOCH_ENTER(et); 2393 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2394 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2395 !(ifp->if_flags & IFF_DYING)) 2396 break; 2397 } 2398 if (ifp != NULL) 2399 if_ref(ifp); 2400 NET_EPOCH_EXIT(et); 2401 return (ifp); 2402 } 2403 2404 struct ifnet * 2405 ifunit(const char *name) 2406 { 2407 struct epoch_tracker et; 2408 struct ifnet *ifp; 2409 2410 NET_EPOCH_ENTER(et); 2411 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2412 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2413 break; 2414 } 2415 NET_EPOCH_EXIT(et); 2416 return (ifp); 2417 } 2418 2419 void * 2420 ifr_buffer_get_buffer(void *data) 2421 { 2422 union ifreq_union *ifrup; 2423 2424 ifrup = data; 2425 #ifdef COMPAT_FREEBSD32 2426 if (SV_CURPROC_FLAG(SV_ILP32)) 2427 return ((void *)(uintptr_t) 2428 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2429 #endif 2430 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2431 } 2432 2433 static void 2434 ifr_buffer_set_buffer_null(void *data) 2435 { 2436 union ifreq_union *ifrup; 2437 2438 ifrup = data; 2439 #ifdef COMPAT_FREEBSD32 2440 if (SV_CURPROC_FLAG(SV_ILP32)) 2441 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2442 else 2443 #endif 2444 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2445 } 2446 2447 size_t 2448 ifr_buffer_get_length(void *data) 2449 { 2450 union ifreq_union *ifrup; 2451 2452 ifrup = data; 2453 #ifdef COMPAT_FREEBSD32 2454 if (SV_CURPROC_FLAG(SV_ILP32)) 2455 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2456 #endif 2457 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2458 } 2459 2460 static void 2461 ifr_buffer_set_length(void *data, size_t len) 2462 { 2463 union ifreq_union *ifrup; 2464 2465 ifrup = data; 2466 #ifdef COMPAT_FREEBSD32 2467 if (SV_CURPROC_FLAG(SV_ILP32)) 2468 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2469 else 2470 #endif 2471 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2472 } 2473 2474 void * 2475 ifr_data_get_ptr(void *ifrp) 2476 { 2477 union ifreq_union *ifrup; 2478 2479 ifrup = ifrp; 2480 #ifdef COMPAT_FREEBSD32 2481 if (SV_CURPROC_FLAG(SV_ILP32)) 2482 return ((void *)(uintptr_t) 2483 ifrup->ifr32.ifr_ifru.ifru_data); 2484 #endif 2485 return (ifrup->ifr.ifr_ifru.ifru_data); 2486 } 2487 2488 /* 2489 * Hardware specific interface ioctls. 2490 */ 2491 int 2492 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2493 { 2494 struct ifreq *ifr; 2495 int error = 0, do_ifup = 0; 2496 int new_flags, temp_flags; 2497 size_t namelen, onamelen; 2498 size_t descrlen; 2499 char *descrbuf, *odescrbuf; 2500 char new_name[IFNAMSIZ]; 2501 struct ifaddr *ifa; 2502 struct sockaddr_dl *sdl; 2503 2504 ifr = (struct ifreq *)data; 2505 switch (cmd) { 2506 case SIOCGIFINDEX: 2507 ifr->ifr_index = ifp->if_index; 2508 break; 2509 2510 case SIOCGIFFLAGS: 2511 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2512 ifr->ifr_flags = temp_flags & 0xffff; 2513 ifr->ifr_flagshigh = temp_flags >> 16; 2514 break; 2515 2516 case SIOCGIFCAP: 2517 ifr->ifr_reqcap = ifp->if_capabilities; 2518 ifr->ifr_curcap = ifp->if_capenable; 2519 break; 2520 2521 case SIOCGIFDATA: 2522 { 2523 struct if_data ifd; 2524 2525 /* Ensure uninitialised padding is not leaked. */ 2526 memset(&ifd, 0, sizeof(ifd)); 2527 2528 if_data_copy(ifp, &ifd); 2529 error = copyout(&ifd, ifr_data_get_ptr(ifr), sizeof(ifd)); 2530 break; 2531 } 2532 2533 #ifdef MAC 2534 case SIOCGIFMAC: 2535 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2536 break; 2537 #endif 2538 2539 case SIOCGIFMETRIC: 2540 ifr->ifr_metric = ifp->if_metric; 2541 break; 2542 2543 case SIOCGIFMTU: 2544 ifr->ifr_mtu = ifp->if_mtu; 2545 break; 2546 2547 case SIOCGIFPHYS: 2548 /* XXXGL: did this ever worked? */ 2549 ifr->ifr_phys = 0; 2550 break; 2551 2552 case SIOCGIFDESCR: 2553 error = 0; 2554 sx_slock(&ifdescr_sx); 2555 if (ifp->if_description == NULL) 2556 error = ENOMSG; 2557 else { 2558 /* space for terminating nul */ 2559 descrlen = strlen(ifp->if_description) + 1; 2560 if (ifr_buffer_get_length(ifr) < descrlen) 2561 ifr_buffer_set_buffer_null(ifr); 2562 else 2563 error = copyout(ifp->if_description, 2564 ifr_buffer_get_buffer(ifr), descrlen); 2565 ifr_buffer_set_length(ifr, descrlen); 2566 } 2567 sx_sunlock(&ifdescr_sx); 2568 break; 2569 2570 case SIOCSIFDESCR: 2571 error = priv_check(td, PRIV_NET_SETIFDESCR); 2572 if (error) 2573 return (error); 2574 2575 /* 2576 * Copy only (length-1) bytes to make sure that 2577 * if_description is always nul terminated. The 2578 * length parameter is supposed to count the 2579 * terminating nul in. 2580 */ 2581 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2582 return (ENAMETOOLONG); 2583 else if (ifr_buffer_get_length(ifr) == 0) 2584 descrbuf = NULL; 2585 else { 2586 descrbuf = malloc(ifr_buffer_get_length(ifr), 2587 M_IFDESCR, M_WAITOK | M_ZERO); 2588 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2589 ifr_buffer_get_length(ifr) - 1); 2590 if (error) { 2591 free(descrbuf, M_IFDESCR); 2592 break; 2593 } 2594 } 2595 2596 sx_xlock(&ifdescr_sx); 2597 odescrbuf = ifp->if_description; 2598 ifp->if_description = descrbuf; 2599 sx_xunlock(&ifdescr_sx); 2600 2601 getmicrotime(&ifp->if_lastchange); 2602 free(odescrbuf, M_IFDESCR); 2603 break; 2604 2605 case SIOCGIFFIB: 2606 ifr->ifr_fib = ifp->if_fib; 2607 break; 2608 2609 case SIOCSIFFIB: 2610 error = priv_check(td, PRIV_NET_SETIFFIB); 2611 if (error) 2612 return (error); 2613 if (ifr->ifr_fib >= rt_numfibs) 2614 return (EINVAL); 2615 2616 ifp->if_fib = ifr->ifr_fib; 2617 break; 2618 2619 case SIOCSIFFLAGS: 2620 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2621 if (error) 2622 return (error); 2623 /* 2624 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2625 * check, so we don't need special handling here yet. 2626 */ 2627 new_flags = (ifr->ifr_flags & 0xffff) | 2628 (ifr->ifr_flagshigh << 16); 2629 if (ifp->if_flags & IFF_UP && 2630 (new_flags & IFF_UP) == 0) { 2631 if_down(ifp); 2632 } else if (new_flags & IFF_UP && 2633 (ifp->if_flags & IFF_UP) == 0) { 2634 do_ifup = 1; 2635 } 2636 /* See if permanently promiscuous mode bit is about to flip */ 2637 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2638 if (new_flags & IFF_PPROMISC) 2639 ifp->if_flags |= IFF_PROMISC; 2640 else if (ifp->if_pcount == 0) 2641 ifp->if_flags &= ~IFF_PROMISC; 2642 if (log_promisc_mode_change) 2643 if_printf(ifp, "permanently promiscuous mode %s\n", 2644 ((new_flags & IFF_PPROMISC) ? 2645 "enabled" : "disabled")); 2646 } 2647 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2648 (new_flags &~ IFF_CANTCHANGE); 2649 if (ifp->if_ioctl) { 2650 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2651 } 2652 if (do_ifup) 2653 if_up(ifp); 2654 getmicrotime(&ifp->if_lastchange); 2655 break; 2656 2657 case SIOCSIFCAP: 2658 error = priv_check(td, PRIV_NET_SETIFCAP); 2659 if (error) 2660 return (error); 2661 if (ifp->if_ioctl == NULL) 2662 return (EOPNOTSUPP); 2663 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2664 return (EINVAL); 2665 error = (*ifp->if_ioctl)(ifp, cmd, data); 2666 if (error == 0) 2667 getmicrotime(&ifp->if_lastchange); 2668 break; 2669 2670 #ifdef MAC 2671 case SIOCSIFMAC: 2672 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2673 break; 2674 #endif 2675 2676 case SIOCSIFNAME: 2677 error = priv_check(td, PRIV_NET_SETIFNAME); 2678 if (error) 2679 return (error); 2680 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2681 NULL); 2682 if (error != 0) 2683 return (error); 2684 if (new_name[0] == '\0') 2685 return (EINVAL); 2686 if (new_name[IFNAMSIZ-1] != '\0') { 2687 new_name[IFNAMSIZ-1] = '\0'; 2688 if (strlen(new_name) == IFNAMSIZ-1) 2689 return (EINVAL); 2690 } 2691 if (strcmp(new_name, ifp->if_xname) == 0) 2692 break; 2693 if (ifunit(new_name) != NULL) 2694 return (EEXIST); 2695 2696 /* 2697 * XXX: Locking. Nothing else seems to lock if_flags, 2698 * and there are numerous other races with the 2699 * ifunit() checks not being atomic with namespace 2700 * changes (renames, vmoves, if_attach, etc). 2701 */ 2702 ifp->if_flags |= IFF_RENAMING; 2703 2704 /* Announce the departure of the interface. */ 2705 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2706 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2707 2708 if_printf(ifp, "changing name to '%s'\n", new_name); 2709 2710 IF_ADDR_WLOCK(ifp); 2711 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2712 ifa = ifp->if_addr; 2713 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2714 namelen = strlen(new_name); 2715 onamelen = sdl->sdl_nlen; 2716 /* 2717 * Move the address if needed. This is safe because we 2718 * allocate space for a name of length IFNAMSIZ when we 2719 * create this in if_attach(). 2720 */ 2721 if (namelen != onamelen) { 2722 bcopy(sdl->sdl_data + onamelen, 2723 sdl->sdl_data + namelen, sdl->sdl_alen); 2724 } 2725 bcopy(new_name, sdl->sdl_data, namelen); 2726 sdl->sdl_nlen = namelen; 2727 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2728 bzero(sdl->sdl_data, onamelen); 2729 while (namelen != 0) 2730 sdl->sdl_data[--namelen] = 0xff; 2731 IF_ADDR_WUNLOCK(ifp); 2732 2733 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2734 /* Announce the return of the interface. */ 2735 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2736 2737 ifp->if_flags &= ~IFF_RENAMING; 2738 break; 2739 2740 #ifdef VIMAGE 2741 case SIOCSIFVNET: 2742 error = priv_check(td, PRIV_NET_SETIFVNET); 2743 if (error) 2744 return (error); 2745 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2746 break; 2747 #endif 2748 2749 case SIOCSIFMETRIC: 2750 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2751 if (error) 2752 return (error); 2753 ifp->if_metric = ifr->ifr_metric; 2754 getmicrotime(&ifp->if_lastchange); 2755 break; 2756 2757 case SIOCSIFPHYS: 2758 error = priv_check(td, PRIV_NET_SETIFPHYS); 2759 if (error) 2760 return (error); 2761 if (ifp->if_ioctl == NULL) 2762 return (EOPNOTSUPP); 2763 error = (*ifp->if_ioctl)(ifp, cmd, data); 2764 if (error == 0) 2765 getmicrotime(&ifp->if_lastchange); 2766 break; 2767 2768 case SIOCSIFMTU: 2769 { 2770 u_long oldmtu = ifp->if_mtu; 2771 2772 error = priv_check(td, PRIV_NET_SETIFMTU); 2773 if (error) 2774 return (error); 2775 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2776 return (EINVAL); 2777 if (ifp->if_ioctl == NULL) 2778 return (EOPNOTSUPP); 2779 error = (*ifp->if_ioctl)(ifp, cmd, data); 2780 if (error == 0) { 2781 getmicrotime(&ifp->if_lastchange); 2782 rt_ifmsg(ifp); 2783 #ifdef INET 2784 DEBUGNET_NOTIFY_MTU(ifp); 2785 #endif 2786 } 2787 /* 2788 * If the link MTU changed, do network layer specific procedure. 2789 */ 2790 if (ifp->if_mtu != oldmtu) { 2791 #ifdef INET6 2792 nd6_setmtu(ifp); 2793 #endif 2794 rt_updatemtu(ifp); 2795 } 2796 break; 2797 } 2798 2799 case SIOCADDMULTI: 2800 case SIOCDELMULTI: 2801 if (cmd == SIOCADDMULTI) 2802 error = priv_check(td, PRIV_NET_ADDMULTI); 2803 else 2804 error = priv_check(td, PRIV_NET_DELMULTI); 2805 if (error) 2806 return (error); 2807 2808 /* Don't allow group membership on non-multicast interfaces. */ 2809 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2810 return (EOPNOTSUPP); 2811 2812 /* Don't let users screw up protocols' entries. */ 2813 if (ifr->ifr_addr.sa_family != AF_LINK) 2814 return (EINVAL); 2815 2816 if (cmd == SIOCADDMULTI) { 2817 struct epoch_tracker et; 2818 struct ifmultiaddr *ifma; 2819 2820 /* 2821 * Userland is only permitted to join groups once 2822 * via the if_addmulti() KPI, because it cannot hold 2823 * struct ifmultiaddr * between calls. It may also 2824 * lose a race while we check if the membership 2825 * already exists. 2826 */ 2827 NET_EPOCH_ENTER(et); 2828 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2829 NET_EPOCH_EXIT(et); 2830 if (ifma != NULL) 2831 error = EADDRINUSE; 2832 else 2833 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2834 } else { 2835 error = if_delmulti(ifp, &ifr->ifr_addr); 2836 } 2837 if (error == 0) 2838 getmicrotime(&ifp->if_lastchange); 2839 break; 2840 2841 case SIOCSIFPHYADDR: 2842 case SIOCDIFPHYADDR: 2843 #ifdef INET6 2844 case SIOCSIFPHYADDR_IN6: 2845 #endif 2846 case SIOCSIFMEDIA: 2847 case SIOCSIFGENERIC: 2848 error = priv_check(td, PRIV_NET_HWIOCTL); 2849 if (error) 2850 return (error); 2851 if (ifp->if_ioctl == NULL) 2852 return (EOPNOTSUPP); 2853 error = (*ifp->if_ioctl)(ifp, cmd, data); 2854 if (error == 0) 2855 getmicrotime(&ifp->if_lastchange); 2856 break; 2857 2858 case SIOCGIFSTATUS: 2859 case SIOCGIFPSRCADDR: 2860 case SIOCGIFPDSTADDR: 2861 case SIOCGIFMEDIA: 2862 case SIOCGIFXMEDIA: 2863 case SIOCGIFGENERIC: 2864 case SIOCGIFRSSKEY: 2865 case SIOCGIFRSSHASH: 2866 case SIOCGIFDOWNREASON: 2867 if (ifp->if_ioctl == NULL) 2868 return (EOPNOTSUPP); 2869 error = (*ifp->if_ioctl)(ifp, cmd, data); 2870 break; 2871 2872 case SIOCSIFLLADDR: 2873 error = priv_check(td, PRIV_NET_SETLLADDR); 2874 if (error) 2875 return (error); 2876 error = if_setlladdr(ifp, 2877 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2878 break; 2879 2880 case SIOCGHWADDR: 2881 error = if_gethwaddr(ifp, ifr); 2882 break; 2883 2884 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2885 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2886 if (error) 2887 return (error); 2888 if ((error = if_addgroup(ifp, 2889 ifgr_group_get((struct ifgroupreq *)data)))) 2890 return (error); 2891 break; 2892 2893 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2894 { 2895 struct epoch_tracker et; 2896 2897 NET_EPOCH_ENTER(et); 2898 error = if_getgroup((struct ifgroupreq *)data, ifp); 2899 NET_EPOCH_EXIT(et); 2900 break; 2901 } 2902 2903 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2904 error = priv_check(td, PRIV_NET_DELIFGROUP); 2905 if (error) 2906 return (error); 2907 if ((error = if_delgroup(ifp, 2908 ifgr_group_get((struct ifgroupreq *)data)))) 2909 return (error); 2910 break; 2911 2912 default: 2913 error = ENOIOCTL; 2914 break; 2915 } 2916 return (error); 2917 } 2918 2919 #ifdef COMPAT_FREEBSD32 2920 struct ifconf32 { 2921 int32_t ifc_len; 2922 union { 2923 uint32_t ifcu_buf; 2924 uint32_t ifcu_req; 2925 } ifc_ifcu; 2926 }; 2927 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2928 #endif 2929 2930 #ifdef COMPAT_FREEBSD32 2931 static void 2932 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2933 { 2934 struct ifmediareq32 *ifmr32; 2935 2936 ifmr32 = (struct ifmediareq32 *)data; 2937 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2938 sizeof(ifmr->ifm_name)); 2939 ifmr->ifm_current = ifmr32->ifm_current; 2940 ifmr->ifm_mask = ifmr32->ifm_mask; 2941 ifmr->ifm_status = ifmr32->ifm_status; 2942 ifmr->ifm_active = ifmr32->ifm_active; 2943 ifmr->ifm_count = ifmr32->ifm_count; 2944 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2945 } 2946 2947 static void 2948 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2949 { 2950 struct ifmediareq32 *ifmr32; 2951 2952 ifmr32 = (struct ifmediareq32 *)data; 2953 ifmr32->ifm_current = ifmr->ifm_current; 2954 ifmr32->ifm_mask = ifmr->ifm_mask; 2955 ifmr32->ifm_status = ifmr->ifm_status; 2956 ifmr32->ifm_active = ifmr->ifm_active; 2957 ifmr32->ifm_count = ifmr->ifm_count; 2958 } 2959 #endif 2960 2961 /* 2962 * Interface ioctls. 2963 */ 2964 int 2965 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2966 { 2967 #ifdef COMPAT_FREEBSD32 2968 caddr_t saved_data = NULL; 2969 struct ifmediareq ifmr; 2970 struct ifmediareq *ifmrp = NULL; 2971 #endif 2972 struct ifnet *ifp; 2973 struct ifreq *ifr; 2974 int error; 2975 int oif_flags; 2976 #ifdef VIMAGE 2977 bool shutdown; 2978 #endif 2979 2980 CURVNET_SET(so->so_vnet); 2981 #ifdef VIMAGE 2982 /* Make sure the VNET is stable. */ 2983 shutdown = VNET_IS_SHUTTING_DOWN(so->so_vnet); 2984 if (shutdown) { 2985 CURVNET_RESTORE(); 2986 return (EBUSY); 2987 } 2988 #endif 2989 2990 switch (cmd) { 2991 case SIOCGIFCONF: 2992 error = ifconf(cmd, data); 2993 goto out_noref; 2994 2995 #ifdef COMPAT_FREEBSD32 2996 case SIOCGIFCONF32: 2997 { 2998 struct ifconf32 *ifc32; 2999 struct ifconf ifc; 3000 3001 ifc32 = (struct ifconf32 *)data; 3002 ifc.ifc_len = ifc32->ifc_len; 3003 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3004 3005 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3006 if (error == 0) 3007 ifc32->ifc_len = ifc.ifc_len; 3008 goto out_noref; 3009 } 3010 #endif 3011 } 3012 3013 #ifdef COMPAT_FREEBSD32 3014 switch (cmd) { 3015 case SIOCGIFMEDIA32: 3016 case SIOCGIFXMEDIA32: 3017 ifmrp = &ifmr; 3018 ifmr_init(ifmrp, data); 3019 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3020 saved_data = data; 3021 data = (caddr_t)ifmrp; 3022 } 3023 #endif 3024 3025 ifr = (struct ifreq *)data; 3026 switch (cmd) { 3027 #ifdef VIMAGE 3028 case SIOCSIFRVNET: 3029 error = priv_check(td, PRIV_NET_SETIFVNET); 3030 if (error == 0) 3031 error = if_vmove_reclaim(td, ifr->ifr_name, 3032 ifr->ifr_jid); 3033 goto out_noref; 3034 #endif 3035 case SIOCIFCREATE: 3036 case SIOCIFCREATE2: 3037 error = priv_check(td, PRIV_NET_IFCREATE); 3038 if (error == 0) 3039 error = if_clone_create(ifr->ifr_name, 3040 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3041 ifr_data_get_ptr(ifr) : NULL); 3042 goto out_noref; 3043 case SIOCIFDESTROY: 3044 error = priv_check(td, PRIV_NET_IFDESTROY); 3045 if (error == 0) 3046 error = if_clone_destroy(ifr->ifr_name); 3047 goto out_noref; 3048 3049 case SIOCIFGCLONERS: 3050 error = if_clone_list((struct if_clonereq *)data); 3051 goto out_noref; 3052 3053 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3054 error = if_getgroupmembers((struct ifgroupreq *)data); 3055 goto out_noref; 3056 3057 #if defined(INET) || defined(INET6) 3058 case SIOCSVH: 3059 case SIOCGVH: 3060 if (carp_ioctl_p == NULL) 3061 error = EPROTONOSUPPORT; 3062 else 3063 error = (*carp_ioctl_p)(ifr, cmd, td); 3064 goto out_noref; 3065 #endif 3066 } 3067 3068 ifp = ifunit_ref(ifr->ifr_name); 3069 if (ifp == NULL) { 3070 error = ENXIO; 3071 goto out_noref; 3072 } 3073 3074 error = ifhwioctl(cmd, ifp, data, td); 3075 if (error != ENOIOCTL) 3076 goto out_ref; 3077 3078 oif_flags = ifp->if_flags; 3079 if (so->so_proto == NULL) { 3080 error = EOPNOTSUPP; 3081 goto out_ref; 3082 } 3083 3084 /* 3085 * Pass the request on to the socket control method, and if the 3086 * latter returns EOPNOTSUPP, directly to the interface. 3087 * 3088 * Make an exception for the legacy SIOCSIF* requests. Drivers 3089 * trust SIOCSIFADDR et al to come from an already privileged 3090 * layer, and do not perform any credentials checks or input 3091 * validation. 3092 */ 3093 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3094 ifp, td)); 3095 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3096 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3097 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3098 error = (*ifp->if_ioctl)(ifp, cmd, data); 3099 3100 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3101 #ifdef INET6 3102 if (ifp->if_flags & IFF_UP) 3103 in6_if_up(ifp); 3104 #endif 3105 } 3106 3107 out_ref: 3108 if_rele(ifp); 3109 out_noref: 3110 #ifdef COMPAT_FREEBSD32 3111 if (ifmrp != NULL) { 3112 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3113 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3114 cmd)); 3115 data = saved_data; 3116 ifmr_update(ifmrp, data); 3117 } 3118 #endif 3119 CURVNET_RESTORE(); 3120 return (error); 3121 } 3122 3123 /* 3124 * The code common to handling reference counted flags, 3125 * e.g., in ifpromisc() and if_allmulti(). 3126 * The "pflag" argument can specify a permanent mode flag to check, 3127 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3128 * 3129 * Only to be used on stack-owned flags, not driver-owned flags. 3130 */ 3131 static int 3132 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3133 { 3134 struct ifreq ifr; 3135 int error; 3136 int oldflags, oldcount; 3137 3138 /* Sanity checks to catch programming errors */ 3139 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3140 ("%s: setting driver-owned flag %d", __func__, flag)); 3141 3142 if (onswitch) 3143 KASSERT(*refcount >= 0, 3144 ("%s: increment negative refcount %d for flag %d", 3145 __func__, *refcount, flag)); 3146 else 3147 KASSERT(*refcount > 0, 3148 ("%s: decrement non-positive refcount %d for flag %d", 3149 __func__, *refcount, flag)); 3150 3151 /* In case this mode is permanent, just touch refcount */ 3152 if (ifp->if_flags & pflag) { 3153 *refcount += onswitch ? 1 : -1; 3154 return (0); 3155 } 3156 3157 /* Save ifnet parameters for if_ioctl() may fail */ 3158 oldcount = *refcount; 3159 oldflags = ifp->if_flags; 3160 3161 /* 3162 * See if we aren't the only and touching refcount is enough. 3163 * Actually toggle interface flag if we are the first or last. 3164 */ 3165 if (onswitch) { 3166 if ((*refcount)++) 3167 return (0); 3168 ifp->if_flags |= flag; 3169 } else { 3170 if (--(*refcount)) 3171 return (0); 3172 ifp->if_flags &= ~flag; 3173 } 3174 3175 /* Call down the driver since we've changed interface flags */ 3176 if (ifp->if_ioctl == NULL) { 3177 error = EOPNOTSUPP; 3178 goto recover; 3179 } 3180 ifr.ifr_flags = ifp->if_flags & 0xffff; 3181 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3182 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3183 if (error) 3184 goto recover; 3185 /* Notify userland that interface flags have changed */ 3186 rt_ifmsg(ifp); 3187 return (0); 3188 3189 recover: 3190 /* Recover after driver error */ 3191 *refcount = oldcount; 3192 ifp->if_flags = oldflags; 3193 return (error); 3194 } 3195 3196 /* 3197 * Set/clear promiscuous mode on interface ifp based on the truth value 3198 * of pswitch. The calls are reference counted so that only the first 3199 * "on" request actually has an effect, as does the final "off" request. 3200 * Results are undefined if the "off" and "on" requests are not matched. 3201 */ 3202 int 3203 ifpromisc(struct ifnet *ifp, int pswitch) 3204 { 3205 int error; 3206 int oldflags = ifp->if_flags; 3207 3208 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3209 &ifp->if_pcount, pswitch); 3210 /* If promiscuous mode status has changed, log a message */ 3211 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3212 log_promisc_mode_change) 3213 if_printf(ifp, "promiscuous mode %s\n", 3214 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3215 return (error); 3216 } 3217 3218 /* 3219 * Return interface configuration 3220 * of system. List may be used 3221 * in later ioctl's (above) to get 3222 * other information. 3223 */ 3224 /*ARGSUSED*/ 3225 static int 3226 ifconf(u_long cmd, caddr_t data) 3227 { 3228 struct ifconf *ifc = (struct ifconf *)data; 3229 struct ifnet *ifp; 3230 struct ifaddr *ifa; 3231 struct ifreq ifr; 3232 struct sbuf *sb; 3233 int error, full = 0, valid_len, max_len; 3234 3235 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3236 max_len = MAXPHYS - 1; 3237 3238 /* Prevent hostile input from being able to crash the system */ 3239 if (ifc->ifc_len <= 0) 3240 return (EINVAL); 3241 3242 again: 3243 if (ifc->ifc_len <= max_len) { 3244 max_len = ifc->ifc_len; 3245 full = 1; 3246 } 3247 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3248 max_len = 0; 3249 valid_len = 0; 3250 3251 IFNET_RLOCK(); 3252 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3253 struct epoch_tracker et; 3254 int addrs; 3255 3256 /* 3257 * Zero the ifr to make sure we don't disclose the contents 3258 * of the stack. 3259 */ 3260 memset(&ifr, 0, sizeof(ifr)); 3261 3262 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3263 >= sizeof(ifr.ifr_name)) { 3264 sbuf_delete(sb); 3265 IFNET_RUNLOCK(); 3266 return (ENAMETOOLONG); 3267 } 3268 3269 addrs = 0; 3270 NET_EPOCH_ENTER(et); 3271 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3272 struct sockaddr *sa = ifa->ifa_addr; 3273 3274 if (prison_if(curthread->td_ucred, sa) != 0) 3275 continue; 3276 addrs++; 3277 if (sa->sa_len <= sizeof(*sa)) { 3278 if (sa->sa_len < sizeof(*sa)) { 3279 memset(&ifr.ifr_ifru.ifru_addr, 0, 3280 sizeof(ifr.ifr_ifru.ifru_addr)); 3281 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3282 sa->sa_len); 3283 } else 3284 ifr.ifr_ifru.ifru_addr = *sa; 3285 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3286 max_len += sizeof(ifr); 3287 } else { 3288 sbuf_bcat(sb, &ifr, 3289 offsetof(struct ifreq, ifr_addr)); 3290 max_len += offsetof(struct ifreq, ifr_addr); 3291 sbuf_bcat(sb, sa, sa->sa_len); 3292 max_len += sa->sa_len; 3293 } 3294 3295 if (sbuf_error(sb) == 0) 3296 valid_len = sbuf_len(sb); 3297 } 3298 NET_EPOCH_EXIT(et); 3299 if (addrs == 0) { 3300 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3301 max_len += sizeof(ifr); 3302 3303 if (sbuf_error(sb) == 0) 3304 valid_len = sbuf_len(sb); 3305 } 3306 } 3307 IFNET_RUNLOCK(); 3308 3309 /* 3310 * If we didn't allocate enough space (uncommon), try again. If 3311 * we have already allocated as much space as we are allowed, 3312 * return what we've got. 3313 */ 3314 if (valid_len != max_len && !full) { 3315 sbuf_delete(sb); 3316 goto again; 3317 } 3318 3319 ifc->ifc_len = valid_len; 3320 sbuf_finish(sb); 3321 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3322 sbuf_delete(sb); 3323 return (error); 3324 } 3325 3326 /* 3327 * Just like ifpromisc(), but for all-multicast-reception mode. 3328 */ 3329 int 3330 if_allmulti(struct ifnet *ifp, int onswitch) 3331 { 3332 3333 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3334 } 3335 3336 struct ifmultiaddr * 3337 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3338 { 3339 struct ifmultiaddr *ifma; 3340 3341 IF_ADDR_LOCK_ASSERT(ifp); 3342 3343 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3344 if (sa->sa_family == AF_LINK) { 3345 if (sa_dl_equal(ifma->ifma_addr, sa)) 3346 break; 3347 } else { 3348 if (sa_equal(ifma->ifma_addr, sa)) 3349 break; 3350 } 3351 } 3352 3353 return ifma; 3354 } 3355 3356 /* 3357 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3358 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3359 * the ifnet multicast address list here, so the caller must do that and 3360 * other setup work (such as notifying the device driver). The reference 3361 * count is initialized to 1. 3362 */ 3363 static struct ifmultiaddr * 3364 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3365 int mflags) 3366 { 3367 struct ifmultiaddr *ifma; 3368 struct sockaddr *dupsa; 3369 3370 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3371 M_ZERO); 3372 if (ifma == NULL) 3373 return (NULL); 3374 3375 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3376 if (dupsa == NULL) { 3377 free(ifma, M_IFMADDR); 3378 return (NULL); 3379 } 3380 bcopy(sa, dupsa, sa->sa_len); 3381 ifma->ifma_addr = dupsa; 3382 3383 ifma->ifma_ifp = ifp; 3384 ifma->ifma_refcount = 1; 3385 ifma->ifma_protospec = NULL; 3386 3387 if (llsa == NULL) { 3388 ifma->ifma_lladdr = NULL; 3389 return (ifma); 3390 } 3391 3392 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3393 if (dupsa == NULL) { 3394 free(ifma->ifma_addr, M_IFMADDR); 3395 free(ifma, M_IFMADDR); 3396 return (NULL); 3397 } 3398 bcopy(llsa, dupsa, llsa->sa_len); 3399 ifma->ifma_lladdr = dupsa; 3400 3401 return (ifma); 3402 } 3403 3404 /* 3405 * if_freemulti: free ifmultiaddr structure and possibly attached related 3406 * addresses. The caller is responsible for implementing reference 3407 * counting, notifying the driver, handling routing messages, and releasing 3408 * any dependent link layer state. 3409 */ 3410 #ifdef MCAST_VERBOSE 3411 extern void kdb_backtrace(void); 3412 #endif 3413 static void 3414 if_freemulti_internal(struct ifmultiaddr *ifma) 3415 { 3416 3417 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3418 ifma->ifma_refcount)); 3419 3420 if (ifma->ifma_lladdr != NULL) 3421 free(ifma->ifma_lladdr, M_IFMADDR); 3422 #ifdef MCAST_VERBOSE 3423 kdb_backtrace(); 3424 printf("%s freeing ifma: %p\n", __func__, ifma); 3425 #endif 3426 free(ifma->ifma_addr, M_IFMADDR); 3427 free(ifma, M_IFMADDR); 3428 } 3429 3430 static void 3431 if_destroymulti(epoch_context_t ctx) 3432 { 3433 struct ifmultiaddr *ifma; 3434 3435 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3436 if_freemulti_internal(ifma); 3437 } 3438 3439 void 3440 if_freemulti(struct ifmultiaddr *ifma) 3441 { 3442 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3443 ifma->ifma_refcount)); 3444 3445 NET_EPOCH_CALL(if_destroymulti, &ifma->ifma_epoch_ctx); 3446 } 3447 3448 /* 3449 * Register an additional multicast address with a network interface. 3450 * 3451 * - If the address is already present, bump the reference count on the 3452 * address and return. 3453 * - If the address is not link-layer, look up a link layer address. 3454 * - Allocate address structures for one or both addresses, and attach to the 3455 * multicast address list on the interface. If automatically adding a link 3456 * layer address, the protocol address will own a reference to the link 3457 * layer address, to be freed when it is freed. 3458 * - Notify the network device driver of an addition to the multicast address 3459 * list. 3460 * 3461 * 'sa' points to caller-owned memory with the desired multicast address. 3462 * 3463 * 'retifma' will be used to return a pointer to the resulting multicast 3464 * address reference, if desired. 3465 */ 3466 int 3467 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3468 struct ifmultiaddr **retifma) 3469 { 3470 struct ifmultiaddr *ifma, *ll_ifma; 3471 struct sockaddr *llsa; 3472 struct sockaddr_dl sdl; 3473 int error; 3474 3475 #ifdef INET 3476 IN_MULTI_LIST_UNLOCK_ASSERT(); 3477 #endif 3478 #ifdef INET6 3479 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3480 #endif 3481 /* 3482 * If the address is already present, return a new reference to it; 3483 * otherwise, allocate storage and set up a new address. 3484 */ 3485 IF_ADDR_WLOCK(ifp); 3486 ifma = if_findmulti(ifp, sa); 3487 if (ifma != NULL) { 3488 ifma->ifma_refcount++; 3489 if (retifma != NULL) 3490 *retifma = ifma; 3491 IF_ADDR_WUNLOCK(ifp); 3492 return (0); 3493 } 3494 3495 /* 3496 * The address isn't already present; resolve the protocol address 3497 * into a link layer address, and then look that up, bump its 3498 * refcount or allocate an ifma for that also. 3499 * Most link layer resolving functions returns address data which 3500 * fits inside default sockaddr_dl structure. However callback 3501 * can allocate another sockaddr structure, in that case we need to 3502 * free it later. 3503 */ 3504 llsa = NULL; 3505 ll_ifma = NULL; 3506 if (ifp->if_resolvemulti != NULL) { 3507 /* Provide called function with buffer size information */ 3508 sdl.sdl_len = sizeof(sdl); 3509 llsa = (struct sockaddr *)&sdl; 3510 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3511 if (error) 3512 goto unlock_out; 3513 } 3514 3515 /* 3516 * Allocate the new address. Don't hook it up yet, as we may also 3517 * need to allocate a link layer multicast address. 3518 */ 3519 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3520 if (ifma == NULL) { 3521 error = ENOMEM; 3522 goto free_llsa_out; 3523 } 3524 3525 /* 3526 * If a link layer address is found, we'll need to see if it's 3527 * already present in the address list, or allocate is as well. 3528 * When this block finishes, the link layer address will be on the 3529 * list. 3530 */ 3531 if (llsa != NULL) { 3532 ll_ifma = if_findmulti(ifp, llsa); 3533 if (ll_ifma == NULL) { 3534 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3535 if (ll_ifma == NULL) { 3536 --ifma->ifma_refcount; 3537 if_freemulti(ifma); 3538 error = ENOMEM; 3539 goto free_llsa_out; 3540 } 3541 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3542 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3543 ifma_link); 3544 } else 3545 ll_ifma->ifma_refcount++; 3546 ifma->ifma_llifma = ll_ifma; 3547 } 3548 3549 /* 3550 * We now have a new multicast address, ifma, and possibly a new or 3551 * referenced link layer address. Add the primary address to the 3552 * ifnet address list. 3553 */ 3554 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3555 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3556 3557 if (retifma != NULL) 3558 *retifma = ifma; 3559 3560 /* 3561 * Must generate the message while holding the lock so that 'ifma' 3562 * pointer is still valid. 3563 */ 3564 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3565 IF_ADDR_WUNLOCK(ifp); 3566 3567 /* 3568 * We are certain we have added something, so call down to the 3569 * interface to let them know about it. 3570 */ 3571 if (ifp->if_ioctl != NULL) { 3572 if (THREAD_CAN_SLEEP()) 3573 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3574 else 3575 taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask); 3576 } 3577 3578 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3579 link_free_sdl(llsa); 3580 3581 return (0); 3582 3583 free_llsa_out: 3584 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3585 link_free_sdl(llsa); 3586 3587 unlock_out: 3588 IF_ADDR_WUNLOCK(ifp); 3589 return (error); 3590 } 3591 3592 static void 3593 if_siocaddmulti(void *arg, int pending) 3594 { 3595 struct ifnet *ifp; 3596 3597 ifp = arg; 3598 #ifdef DIAGNOSTIC 3599 if (pending > 1) 3600 if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending); 3601 #endif 3602 CURVNET_SET(ifp->if_vnet); 3603 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3604 CURVNET_RESTORE(); 3605 } 3606 3607 /* 3608 * Delete a multicast group membership by network-layer group address. 3609 * 3610 * Returns ENOENT if the entry could not be found. If ifp no longer 3611 * exists, results are undefined. This entry point should only be used 3612 * from subsystems which do appropriate locking to hold ifp for the 3613 * duration of the call. 3614 * Network-layer protocol domains must use if_delmulti_ifma(). 3615 */ 3616 int 3617 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3618 { 3619 struct ifmultiaddr *ifma; 3620 int lastref; 3621 3622 KASSERT(ifp, ("%s: NULL ifp", __func__)); 3623 3624 IF_ADDR_WLOCK(ifp); 3625 lastref = 0; 3626 ifma = if_findmulti(ifp, sa); 3627 if (ifma != NULL) 3628 lastref = if_delmulti_locked(ifp, ifma, 0); 3629 IF_ADDR_WUNLOCK(ifp); 3630 3631 if (ifma == NULL) 3632 return (ENOENT); 3633 3634 if (lastref && ifp->if_ioctl != NULL) { 3635 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3636 } 3637 3638 return (0); 3639 } 3640 3641 /* 3642 * Delete all multicast group membership for an interface. 3643 * Should be used to quickly flush all multicast filters. 3644 */ 3645 void 3646 if_delallmulti(struct ifnet *ifp) 3647 { 3648 struct ifmultiaddr *ifma; 3649 struct ifmultiaddr *next; 3650 3651 IF_ADDR_WLOCK(ifp); 3652 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3653 if_delmulti_locked(ifp, ifma, 0); 3654 IF_ADDR_WUNLOCK(ifp); 3655 } 3656 3657 void 3658 if_delmulti_ifma(struct ifmultiaddr *ifma) 3659 { 3660 if_delmulti_ifma_flags(ifma, 0); 3661 } 3662 3663 /* 3664 * Delete a multicast group membership by group membership pointer. 3665 * Network-layer protocol domains must use this routine. 3666 * 3667 * It is safe to call this routine if the ifp disappeared. 3668 */ 3669 void 3670 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3671 { 3672 struct ifnet *ifp; 3673 int lastref; 3674 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3675 #ifdef INET 3676 IN_MULTI_LIST_UNLOCK_ASSERT(); 3677 #endif 3678 ifp = ifma->ifma_ifp; 3679 #ifdef DIAGNOSTIC 3680 if (ifp == NULL) { 3681 printf("%s: ifma_ifp seems to be detached\n", __func__); 3682 } else { 3683 struct epoch_tracker et; 3684 struct ifnet *oifp; 3685 3686 NET_EPOCH_ENTER(et); 3687 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3688 if (ifp == oifp) 3689 break; 3690 NET_EPOCH_EXIT(et); 3691 if (ifp != oifp) 3692 ifp = NULL; 3693 } 3694 #endif 3695 /* 3696 * If and only if the ifnet instance exists: Acquire the address lock. 3697 */ 3698 if (ifp != NULL) 3699 IF_ADDR_WLOCK(ifp); 3700 3701 lastref = if_delmulti_locked(ifp, ifma, flags); 3702 3703 if (ifp != NULL) { 3704 /* 3705 * If and only if the ifnet instance exists: 3706 * Release the address lock. 3707 * If the group was left: update the hardware hash filter. 3708 */ 3709 IF_ADDR_WUNLOCK(ifp); 3710 if (lastref && ifp->if_ioctl != NULL) { 3711 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3712 } 3713 } 3714 } 3715 3716 /* 3717 * Perform deletion of network-layer and/or link-layer multicast address. 3718 * 3719 * Return 0 if the reference count was decremented. 3720 * Return 1 if the final reference was released, indicating that the 3721 * hardware hash filter should be reprogrammed. 3722 */ 3723 static int 3724 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3725 { 3726 struct ifmultiaddr *ll_ifma; 3727 3728 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3729 KASSERT(ifma->ifma_ifp == ifp, 3730 ("%s: inconsistent ifp %p", __func__, ifp)); 3731 IF_ADDR_WLOCK_ASSERT(ifp); 3732 } 3733 3734 ifp = ifma->ifma_ifp; 3735 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3736 3737 /* 3738 * If the ifnet is detaching, null out references to ifnet, 3739 * so that upper protocol layers will notice, and not attempt 3740 * to obtain locks for an ifnet which no longer exists. The 3741 * routing socket announcement must happen before the ifnet 3742 * instance is detached from the system. 3743 */ 3744 if (detaching) { 3745 #ifdef DIAGNOSTIC 3746 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3747 #endif 3748 /* 3749 * ifp may already be nulled out if we are being reentered 3750 * to delete the ll_ifma. 3751 */ 3752 if (ifp != NULL) { 3753 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3754 ifma->ifma_ifp = NULL; 3755 } 3756 } 3757 3758 if (--ifma->ifma_refcount > 0) 3759 return 0; 3760 3761 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3762 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3763 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3764 } 3765 /* 3766 * If this ifma is a network-layer ifma, a link-layer ifma may 3767 * have been associated with it. Release it first if so. 3768 */ 3769 ll_ifma = ifma->ifma_llifma; 3770 if (ll_ifma != NULL) { 3771 KASSERT(ifma->ifma_lladdr != NULL, 3772 ("%s: llifma w/o lladdr", __func__)); 3773 if (detaching) 3774 ll_ifma->ifma_ifp = NULL; /* XXX */ 3775 if (--ll_ifma->ifma_refcount == 0) { 3776 if (ifp != NULL) { 3777 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3778 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3779 ifma_link); 3780 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3781 } 3782 } 3783 if_freemulti(ll_ifma); 3784 } 3785 } 3786 #ifdef INVARIANTS 3787 if (ifp) { 3788 struct ifmultiaddr *ifmatmp; 3789 3790 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3791 MPASS(ifma != ifmatmp); 3792 } 3793 #endif 3794 if_freemulti(ifma); 3795 /* 3796 * The last reference to this instance of struct ifmultiaddr 3797 * was released; the hardware should be notified of this change. 3798 */ 3799 return 1; 3800 } 3801 3802 /* 3803 * Set the link layer address on an interface. 3804 * 3805 * At this time we only support certain types of interfaces, 3806 * and we don't allow the length of the address to change. 3807 * 3808 * Set noinline to be dtrace-friendly 3809 */ 3810 __noinline int 3811 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3812 { 3813 struct sockaddr_dl *sdl; 3814 struct ifaddr *ifa; 3815 struct ifreq ifr; 3816 3817 ifa = ifp->if_addr; 3818 if (ifa == NULL) 3819 return (EINVAL); 3820 3821 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3822 if (sdl == NULL) 3823 return (EINVAL); 3824 3825 if (len != sdl->sdl_alen) /* don't allow length to change */ 3826 return (EINVAL); 3827 3828 switch (ifp->if_type) { 3829 case IFT_ETHER: 3830 case IFT_XETHER: 3831 case IFT_L2VLAN: 3832 case IFT_BRIDGE: 3833 case IFT_IEEE8023ADLAG: 3834 bcopy(lladdr, LLADDR(sdl), len); 3835 break; 3836 default: 3837 return (ENODEV); 3838 } 3839 3840 /* 3841 * If the interface is already up, we need 3842 * to re-init it in order to reprogram its 3843 * address filter. 3844 */ 3845 if ((ifp->if_flags & IFF_UP) != 0) { 3846 if (ifp->if_ioctl) { 3847 ifp->if_flags &= ~IFF_UP; 3848 ifr.ifr_flags = ifp->if_flags & 0xffff; 3849 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3850 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3851 ifp->if_flags |= IFF_UP; 3852 ifr.ifr_flags = ifp->if_flags & 0xffff; 3853 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3854 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3855 } 3856 } 3857 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3858 3859 return (0); 3860 } 3861 3862 /* 3863 * Compat function for handling basic encapsulation requests. 3864 * Not converted stacks (FDDI, IB, ..) supports traditional 3865 * output model: ARP (and other similar L2 protocols) are handled 3866 * inside output routine, arpresolve/nd6_resolve() returns MAC 3867 * address instead of full prepend. 3868 * 3869 * This function creates calculated header==MAC for IPv4/IPv6 and 3870 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3871 * address families. 3872 */ 3873 static int 3874 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3875 { 3876 3877 if (req->rtype != IFENCAP_LL) 3878 return (EOPNOTSUPP); 3879 3880 if (req->bufsize < req->lladdr_len) 3881 return (ENOMEM); 3882 3883 switch (req->family) { 3884 case AF_INET: 3885 case AF_INET6: 3886 break; 3887 default: 3888 return (EAFNOSUPPORT); 3889 } 3890 3891 /* Copy lladdr to storage as is */ 3892 memmove(req->buf, req->lladdr, req->lladdr_len); 3893 req->bufsize = req->lladdr_len; 3894 req->lladdr_off = 0; 3895 3896 return (0); 3897 } 3898 3899 /* 3900 * Tunnel interfaces can nest, also they may cause infinite recursion 3901 * calls when misconfigured. We'll prevent this by detecting loops. 3902 * High nesting level may cause stack exhaustion. We'll prevent this 3903 * by introducing upper limit. 3904 * 3905 * Return 0, if tunnel nesting count is equal or less than limit. 3906 */ 3907 int 3908 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3909 int limit) 3910 { 3911 struct m_tag *mtag; 3912 int count; 3913 3914 count = 1; 3915 mtag = NULL; 3916 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3917 if (*(struct ifnet **)(mtag + 1) == ifp) { 3918 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3919 return (EIO); 3920 } 3921 count++; 3922 } 3923 if (count > limit) { 3924 log(LOG_NOTICE, 3925 "%s: if_output recursively called too many times(%d)\n", 3926 if_name(ifp), count); 3927 return (EIO); 3928 } 3929 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3930 if (mtag == NULL) 3931 return (ENOMEM); 3932 *(struct ifnet **)(mtag + 1) = ifp; 3933 m_tag_prepend(m, mtag); 3934 return (0); 3935 } 3936 3937 /* 3938 * Get the link layer address that was read from the hardware at attach. 3939 * 3940 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3941 * their component interfaces as IFT_IEEE8023ADLAG. 3942 */ 3943 int 3944 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3945 { 3946 3947 if (ifp->if_hw_addr == NULL) 3948 return (ENODEV); 3949 3950 switch (ifp->if_type) { 3951 case IFT_ETHER: 3952 case IFT_IEEE8023ADLAG: 3953 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3954 return (0); 3955 default: 3956 return (ENODEV); 3957 } 3958 } 3959 3960 /* 3961 * The name argument must be a pointer to storage which will last as 3962 * long as the interface does. For physical devices, the result of 3963 * device_get_name(dev) is a good choice and for pseudo-devices a 3964 * static string works well. 3965 */ 3966 void 3967 if_initname(struct ifnet *ifp, const char *name, int unit) 3968 { 3969 ifp->if_dname = name; 3970 ifp->if_dunit = unit; 3971 if (unit != IF_DUNIT_NONE) 3972 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3973 else 3974 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3975 } 3976 3977 int 3978 if_printf(struct ifnet *ifp, const char *fmt, ...) 3979 { 3980 char if_fmt[256]; 3981 va_list ap; 3982 3983 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3984 va_start(ap, fmt); 3985 vlog(LOG_INFO, if_fmt, ap); 3986 va_end(ap); 3987 return (0); 3988 } 3989 3990 void 3991 if_start(struct ifnet *ifp) 3992 { 3993 3994 (*(ifp)->if_start)(ifp); 3995 } 3996 3997 /* 3998 * Backwards compatibility interface for drivers 3999 * that have not implemented it 4000 */ 4001 static int 4002 if_transmit(struct ifnet *ifp, struct mbuf *m) 4003 { 4004 int error; 4005 4006 IFQ_HANDOFF(ifp, m, error); 4007 return (error); 4008 } 4009 4010 static void 4011 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4012 { 4013 4014 m_freem(m); 4015 } 4016 4017 int 4018 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4019 { 4020 int active = 0; 4021 4022 IF_LOCK(ifq); 4023 if (_IF_QFULL(ifq)) { 4024 IF_UNLOCK(ifq); 4025 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4026 m_freem(m); 4027 return (0); 4028 } 4029 if (ifp != NULL) { 4030 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4031 if (m->m_flags & (M_BCAST|M_MCAST)) 4032 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4033 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4034 } 4035 _IF_ENQUEUE(ifq, m); 4036 IF_UNLOCK(ifq); 4037 if (ifp != NULL && !active) 4038 (*(ifp)->if_start)(ifp); 4039 return (1); 4040 } 4041 4042 void 4043 if_register_com_alloc(u_char type, 4044 if_com_alloc_t *a, if_com_free_t *f) 4045 { 4046 4047 KASSERT(if_com_alloc[type] == NULL, 4048 ("if_register_com_alloc: %d already registered", type)); 4049 KASSERT(if_com_free[type] == NULL, 4050 ("if_register_com_alloc: %d free already registered", type)); 4051 4052 if_com_alloc[type] = a; 4053 if_com_free[type] = f; 4054 } 4055 4056 void 4057 if_deregister_com_alloc(u_char type) 4058 { 4059 4060 KASSERT(if_com_alloc[type] != NULL, 4061 ("if_deregister_com_alloc: %d not registered", type)); 4062 KASSERT(if_com_free[type] != NULL, 4063 ("if_deregister_com_alloc: %d free not registered", type)); 4064 if_com_alloc[type] = NULL; 4065 if_com_free[type] = NULL; 4066 } 4067 4068 /* API for driver access to network stack owned ifnet.*/ 4069 uint64_t 4070 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4071 { 4072 uint64_t oldbrate; 4073 4074 oldbrate = ifp->if_baudrate; 4075 ifp->if_baudrate = baudrate; 4076 return (oldbrate); 4077 } 4078 4079 uint64_t 4080 if_getbaudrate(if_t ifp) 4081 { 4082 4083 return (((struct ifnet *)ifp)->if_baudrate); 4084 } 4085 4086 int 4087 if_setcapabilities(if_t ifp, int capabilities) 4088 { 4089 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4090 return (0); 4091 } 4092 4093 int 4094 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4095 { 4096 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4097 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4098 4099 return (0); 4100 } 4101 4102 int 4103 if_getcapabilities(if_t ifp) 4104 { 4105 return ((struct ifnet *)ifp)->if_capabilities; 4106 } 4107 4108 int 4109 if_setcapenable(if_t ifp, int capabilities) 4110 { 4111 ((struct ifnet *)ifp)->if_capenable = capabilities; 4112 return (0); 4113 } 4114 4115 int 4116 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4117 { 4118 if(setcap) 4119 ((struct ifnet *)ifp)->if_capenable |= setcap; 4120 if(clearcap) 4121 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4122 4123 return (0); 4124 } 4125 4126 const char * 4127 if_getdname(if_t ifp) 4128 { 4129 return ((struct ifnet *)ifp)->if_dname; 4130 } 4131 4132 int 4133 if_togglecapenable(if_t ifp, int togglecap) 4134 { 4135 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4136 return (0); 4137 } 4138 4139 int 4140 if_getcapenable(if_t ifp) 4141 { 4142 return ((struct ifnet *)ifp)->if_capenable; 4143 } 4144 4145 /* 4146 * This is largely undesirable because it ties ifnet to a device, but does 4147 * provide flexiblity for an embedded product vendor. Should be used with 4148 * the understanding that it violates the interface boundaries, and should be 4149 * a last resort only. 4150 */ 4151 int 4152 if_setdev(if_t ifp, void *dev) 4153 { 4154 return (0); 4155 } 4156 4157 int 4158 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4159 { 4160 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4161 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4162 4163 return (0); 4164 } 4165 4166 int 4167 if_getdrvflags(if_t ifp) 4168 { 4169 return ((struct ifnet *)ifp)->if_drv_flags; 4170 } 4171 4172 int 4173 if_setdrvflags(if_t ifp, int flags) 4174 { 4175 ((struct ifnet *)ifp)->if_drv_flags = flags; 4176 return (0); 4177 } 4178 4179 int 4180 if_setflags(if_t ifp, int flags) 4181 { 4182 4183 ifp->if_flags = flags; 4184 return (0); 4185 } 4186 4187 int 4188 if_setflagbits(if_t ifp, int set, int clear) 4189 { 4190 ((struct ifnet *)ifp)->if_flags |= set; 4191 ((struct ifnet *)ifp)->if_flags &= ~clear; 4192 4193 return (0); 4194 } 4195 4196 int 4197 if_getflags(if_t ifp) 4198 { 4199 return ((struct ifnet *)ifp)->if_flags; 4200 } 4201 4202 int 4203 if_clearhwassist(if_t ifp) 4204 { 4205 ((struct ifnet *)ifp)->if_hwassist = 0; 4206 return (0); 4207 } 4208 4209 int 4210 if_sethwassistbits(if_t ifp, int toset, int toclear) 4211 { 4212 ((struct ifnet *)ifp)->if_hwassist |= toset; 4213 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4214 4215 return (0); 4216 } 4217 4218 int 4219 if_sethwassist(if_t ifp, int hwassist_bit) 4220 { 4221 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4222 return (0); 4223 } 4224 4225 int 4226 if_gethwassist(if_t ifp) 4227 { 4228 return ((struct ifnet *)ifp)->if_hwassist; 4229 } 4230 4231 int 4232 if_setmtu(if_t ifp, int mtu) 4233 { 4234 ((struct ifnet *)ifp)->if_mtu = mtu; 4235 return (0); 4236 } 4237 4238 int 4239 if_getmtu(if_t ifp) 4240 { 4241 return ((struct ifnet *)ifp)->if_mtu; 4242 } 4243 4244 int 4245 if_getmtu_family(if_t ifp, int family) 4246 { 4247 struct domain *dp; 4248 4249 for (dp = domains; dp; dp = dp->dom_next) { 4250 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4251 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4252 } 4253 4254 return (((struct ifnet *)ifp)->if_mtu); 4255 } 4256 4257 /* 4258 * Methods for drivers to access interface unicast and multicast 4259 * link level addresses. Driver shall not know 'struct ifaddr' neither 4260 * 'struct ifmultiaddr'. 4261 */ 4262 u_int 4263 if_lladdr_count(if_t ifp) 4264 { 4265 struct epoch_tracker et; 4266 struct ifaddr *ifa; 4267 u_int count; 4268 4269 count = 0; 4270 NET_EPOCH_ENTER(et); 4271 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4272 if (ifa->ifa_addr->sa_family == AF_LINK) 4273 count++; 4274 NET_EPOCH_EXIT(et); 4275 4276 return (count); 4277 } 4278 4279 u_int 4280 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4281 { 4282 struct epoch_tracker et; 4283 struct ifaddr *ifa; 4284 u_int count; 4285 4286 MPASS(cb); 4287 4288 count = 0; 4289 NET_EPOCH_ENTER(et); 4290 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 4291 if (ifa->ifa_addr->sa_family != AF_LINK) 4292 continue; 4293 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr, 4294 count); 4295 } 4296 NET_EPOCH_EXIT(et); 4297 4298 return (count); 4299 } 4300 4301 u_int 4302 if_llmaddr_count(if_t ifp) 4303 { 4304 struct epoch_tracker et; 4305 struct ifmultiaddr *ifma; 4306 int count; 4307 4308 count = 0; 4309 NET_EPOCH_ENTER(et); 4310 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4311 if (ifma->ifma_addr->sa_family == AF_LINK) 4312 count++; 4313 NET_EPOCH_EXIT(et); 4314 4315 return (count); 4316 } 4317 4318 u_int 4319 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4320 { 4321 struct epoch_tracker et; 4322 struct ifmultiaddr *ifma; 4323 u_int count; 4324 4325 MPASS(cb); 4326 4327 count = 0; 4328 NET_EPOCH_ENTER(et); 4329 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 4330 if (ifma->ifma_addr->sa_family != AF_LINK) 4331 continue; 4332 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr, 4333 count); 4334 } 4335 NET_EPOCH_EXIT(et); 4336 4337 return (count); 4338 } 4339 4340 int 4341 if_setsoftc(if_t ifp, void *softc) 4342 { 4343 ((struct ifnet *)ifp)->if_softc = softc; 4344 return (0); 4345 } 4346 4347 void * 4348 if_getsoftc(if_t ifp) 4349 { 4350 return ((struct ifnet *)ifp)->if_softc; 4351 } 4352 4353 void 4354 if_setrcvif(struct mbuf *m, if_t ifp) 4355 { 4356 4357 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4358 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4359 } 4360 4361 void 4362 if_setvtag(struct mbuf *m, uint16_t tag) 4363 { 4364 m->m_pkthdr.ether_vtag = tag; 4365 } 4366 4367 uint16_t 4368 if_getvtag(struct mbuf *m) 4369 { 4370 4371 return (m->m_pkthdr.ether_vtag); 4372 } 4373 4374 int 4375 if_sendq_empty(if_t ifp) 4376 { 4377 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4378 } 4379 4380 struct ifaddr * 4381 if_getifaddr(if_t ifp) 4382 { 4383 return ((struct ifnet *)ifp)->if_addr; 4384 } 4385 4386 int 4387 if_getamcount(if_t ifp) 4388 { 4389 return ((struct ifnet *)ifp)->if_amcount; 4390 } 4391 4392 int 4393 if_setsendqready(if_t ifp) 4394 { 4395 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4396 return (0); 4397 } 4398 4399 int 4400 if_setsendqlen(if_t ifp, int tx_desc_count) 4401 { 4402 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4403 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4404 4405 return (0); 4406 } 4407 4408 int 4409 if_vlantrunkinuse(if_t ifp) 4410 { 4411 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4412 } 4413 4414 int 4415 if_input(if_t ifp, struct mbuf* sendmp) 4416 { 4417 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4418 return (0); 4419 4420 } 4421 4422 struct mbuf * 4423 if_dequeue(if_t ifp) 4424 { 4425 struct mbuf *m; 4426 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4427 4428 return (m); 4429 } 4430 4431 int 4432 if_sendq_prepend(if_t ifp, struct mbuf *m) 4433 { 4434 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4435 return (0); 4436 } 4437 4438 int 4439 if_setifheaderlen(if_t ifp, int len) 4440 { 4441 ((struct ifnet *)ifp)->if_hdrlen = len; 4442 return (0); 4443 } 4444 4445 caddr_t 4446 if_getlladdr(if_t ifp) 4447 { 4448 return (IF_LLADDR((struct ifnet *)ifp)); 4449 } 4450 4451 void * 4452 if_gethandle(u_char type) 4453 { 4454 return (if_alloc(type)); 4455 } 4456 4457 void 4458 if_bpfmtap(if_t ifh, struct mbuf *m) 4459 { 4460 struct ifnet *ifp = (struct ifnet *)ifh; 4461 4462 BPF_MTAP(ifp, m); 4463 } 4464 4465 void 4466 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4467 { 4468 struct ifnet *ifp = (struct ifnet *)ifh; 4469 4470 ETHER_BPF_MTAP(ifp, m); 4471 } 4472 4473 void 4474 if_vlancap(if_t ifh) 4475 { 4476 struct ifnet *ifp = (struct ifnet *)ifh; 4477 VLAN_CAPABILITIES(ifp); 4478 } 4479 4480 int 4481 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4482 { 4483 4484 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4485 return (0); 4486 } 4487 4488 int 4489 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4490 { 4491 4492 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4493 return (0); 4494 } 4495 4496 int 4497 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4498 { 4499 4500 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4501 return (0); 4502 } 4503 4504 u_int 4505 if_gethwtsomax(if_t ifp) 4506 { 4507 4508 return (((struct ifnet *)ifp)->if_hw_tsomax); 4509 } 4510 4511 u_int 4512 if_gethwtsomaxsegcount(if_t ifp) 4513 { 4514 4515 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4516 } 4517 4518 u_int 4519 if_gethwtsomaxsegsize(if_t ifp) 4520 { 4521 4522 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4523 } 4524 4525 void 4526 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4527 { 4528 ((struct ifnet *)ifp)->if_init = init_fn; 4529 } 4530 4531 void 4532 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4533 { 4534 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4535 } 4536 4537 void 4538 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4539 { 4540 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4541 } 4542 4543 void 4544 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4545 { 4546 ((struct ifnet *)ifp)->if_transmit = start_fn; 4547 } 4548 4549 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4550 { 4551 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4552 4553 } 4554 4555 void 4556 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4557 { 4558 4559 ifp->if_get_counter = fn; 4560 } 4561 4562 /* Revisit these - These are inline functions originally. */ 4563 int 4564 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4565 { 4566 return drbr_inuse(ifh, br); 4567 } 4568 4569 struct mbuf* 4570 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4571 { 4572 return drbr_dequeue(ifh, br); 4573 } 4574 4575 int 4576 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4577 { 4578 return drbr_needs_enqueue(ifh, br); 4579 } 4580 4581 int 4582 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4583 { 4584 return drbr_enqueue(ifh, br, m); 4585 4586 } 4587