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