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/vnet.h> 84 85 #if defined(INET) || defined(INET6) 86 #include <net/ethernet.h> 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/ip.h> 90 #include <netinet/ip_carp.h> 91 #ifdef INET 92 #include <net/debugnet.h> 93 #include <netinet/if_ether.h> 94 #endif /* INET */ 95 #ifdef INET6 96 #include <netinet6/in6_var.h> 97 #include <netinet6/in6_ifattach.h> 98 #endif /* INET6 */ 99 #endif /* INET || INET6 */ 100 101 #include <security/mac/mac_framework.h> 102 103 /* 104 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 105 * and ifr_ifru when it is used in SIOCGIFCONF. 106 */ 107 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 108 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 109 110 __read_mostly epoch_t net_epoch_preempt; 111 __read_mostly epoch_t net_epoch; 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, 0, "Link layers"); 197 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 198 199 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 200 &ifqmaxlen, 0, "max send queue size"); 201 202 /* Log link state change events */ 203 static int log_link_state_change = 1; 204 205 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 206 &log_link_state_change, 0, 207 "log interface link state change events"); 208 209 /* Log promiscuous mode change events */ 210 static int log_promisc_mode_change = 1; 211 212 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 213 &log_promisc_mode_change, 1, 214 "log promiscuous mode change events"); 215 216 /* Interface description */ 217 static unsigned int ifdescr_maxlen = 1024; 218 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 219 &ifdescr_maxlen, 0, 220 "administrative maximum length for interface description"); 221 222 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 223 224 /* global sx for non-critical path ifdescr */ 225 static struct sx ifdescr_sx; 226 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 227 228 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 229 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 230 /* These are external hooks for CARP. */ 231 void (*carp_linkstate_p)(struct ifnet *ifp); 232 void (*carp_demote_adj_p)(int, char *); 233 int (*carp_master_p)(struct ifaddr *); 234 #if defined(INET) || defined(INET6) 235 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 236 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 237 const struct sockaddr *sa); 238 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 239 int (*carp_attach_p)(struct ifaddr *, int); 240 void (*carp_detach_p)(struct ifaddr *, bool); 241 #endif 242 #ifdef INET 243 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 244 #endif 245 #ifdef INET6 246 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 247 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 248 const struct in6_addr *taddr); 249 #endif 250 251 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 252 253 /* 254 * XXX: Style; these should be sorted alphabetically, and unprototyped 255 * static functions should be prototyped. Currently they are sorted by 256 * declaration order. 257 */ 258 static void if_attachdomain(void *); 259 static void if_attachdomain1(struct ifnet *); 260 static int ifconf(u_long, caddr_t); 261 static void *if_grow(void); 262 static void if_input_default(struct ifnet *, struct mbuf *); 263 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 264 static void if_route(struct ifnet *, int flag, int fam); 265 static int if_setflag(struct ifnet *, int, int, int *, int); 266 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 267 static void if_unroute(struct ifnet *, int flag, int fam); 268 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 269 static void do_link_state_change(void *, int); 270 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 271 static int if_getgroupmembers(struct ifgroupreq *); 272 static void if_delgroups(struct ifnet *); 273 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 274 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 275 static void if_siocaddmulti(void *, int); 276 #ifdef VIMAGE 277 static void if_vmove(struct ifnet *, struct vnet *); 278 #endif 279 280 #ifdef INET6 281 /* 282 * XXX: declare here to avoid to include many inet6 related files.. 283 * should be more generalized? 284 */ 285 extern void nd6_setmtu(struct ifnet *); 286 #endif 287 288 /* ipsec helper hooks */ 289 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 290 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 291 292 VNET_DEFINE(int, if_index); 293 int ifqmaxlen = IFQ_MAXLEN; 294 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 295 VNET_DEFINE(struct ifgrouphead, ifg_head); 296 297 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 298 299 /* Table of ifnet by index. */ 300 VNET_DEFINE(struct ifnet **, ifindex_table); 301 302 #define V_if_indexlim VNET(if_indexlim) 303 #define V_ifindex_table VNET(ifindex_table) 304 305 /* 306 * The global network interface list (V_ifnet) and related state (such as 307 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 308 * an rwlock. Either may be acquired shared to stablize the list, but both 309 * must be acquired writable to modify the list. This model allows us to 310 * both stablize the interface list during interrupt thread processing, but 311 * also to stablize it over long-running ioctls, without introducing priority 312 * inversions and deadlocks. 313 */ 314 struct rwlock ifnet_rwlock; 315 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 316 struct sx ifnet_sxlock; 317 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 318 319 /* 320 * The allocation of network interfaces is a rather non-atomic affair; we 321 * need to select an index before we are ready to expose the interface for 322 * use, so will use this pointer value to indicate reservation. 323 */ 324 #define IFNET_HOLD (void *)(uintptr_t)(-1) 325 326 static if_com_alloc_t *if_com_alloc[256]; 327 static if_com_free_t *if_com_free[256]; 328 329 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 330 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 331 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 332 333 struct ifnet * 334 ifnet_byindex(u_short idx) 335 { 336 struct ifnet *ifp; 337 338 if (__predict_false(idx > V_if_index)) 339 return (NULL); 340 341 ifp = *(struct ifnet * const volatile *)(V_ifindex_table + idx); 342 return (__predict_false(ifp == IFNET_HOLD) ? NULL : ifp); 343 } 344 345 struct ifnet * 346 ifnet_byindex_ref(u_short idx) 347 { 348 struct ifnet *ifp; 349 350 NET_EPOCH_ASSERT(); 351 352 ifp = ifnet_byindex(idx); 353 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) 354 return (NULL); 355 if_ref(ifp); 356 return (ifp); 357 } 358 359 /* 360 * Allocate an ifindex array entry; return 0 on success or an error on 361 * failure. 362 */ 363 static u_short 364 ifindex_alloc(void **old) 365 { 366 u_short idx; 367 368 IFNET_WLOCK_ASSERT(); 369 /* 370 * Try to find an empty slot below V_if_index. If we fail, take the 371 * next slot. 372 */ 373 for (idx = 1; idx <= V_if_index; idx++) { 374 if (V_ifindex_table[idx] == NULL) 375 break; 376 } 377 378 /* Catch if_index overflow. */ 379 if (idx >= V_if_indexlim) { 380 *old = if_grow(); 381 return (USHRT_MAX); 382 } 383 if (idx > V_if_index) 384 V_if_index = idx; 385 return (idx); 386 } 387 388 static void 389 ifindex_free_locked(u_short idx) 390 { 391 392 IFNET_WLOCK_ASSERT(); 393 394 V_ifindex_table[idx] = NULL; 395 while (V_if_index > 0 && 396 V_ifindex_table[V_if_index] == NULL) 397 V_if_index--; 398 } 399 400 static void 401 ifindex_free(u_short idx) 402 { 403 404 IFNET_WLOCK(); 405 ifindex_free_locked(idx); 406 IFNET_WUNLOCK(); 407 } 408 409 static void 410 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 411 { 412 413 V_ifindex_table[idx] = ifp; 414 } 415 416 struct ifaddr * 417 ifaddr_byindex(u_short idx) 418 { 419 struct ifnet *ifp; 420 struct ifaddr *ifa = NULL; 421 422 NET_EPOCH_ASSERT(); 423 424 ifp = ifnet_byindex(idx); 425 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 426 ifa_ref(ifa); 427 return (ifa); 428 } 429 430 /* 431 * Network interface utility routines. 432 * 433 * Routines with ifa_ifwith* names take sockaddr *'s as 434 * parameters. 435 */ 436 437 static void 438 vnet_if_init(const void *unused __unused) 439 { 440 void *old; 441 442 CK_STAILQ_INIT(&V_ifnet); 443 CK_STAILQ_INIT(&V_ifg_head); 444 IFNET_WLOCK(); 445 old = if_grow(); /* create initial table */ 446 IFNET_WUNLOCK(); 447 epoch_wait_preempt(net_epoch_preempt); 448 free(old, M_IFNET); 449 vnet_if_clone_init(); 450 } 451 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 452 NULL); 453 454 #ifdef VIMAGE 455 static void 456 vnet_if_uninit(const void *unused __unused) 457 { 458 459 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 460 "not empty", __func__, __LINE__, &V_ifnet)); 461 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 462 "not empty", __func__, __LINE__, &V_ifg_head)); 463 464 free((caddr_t)V_ifindex_table, M_IFNET); 465 } 466 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 467 vnet_if_uninit, NULL); 468 469 static void 470 vnet_if_return(const void *unused __unused) 471 { 472 struct ifnet *ifp, *nifp; 473 474 /* Return all inherited interfaces to their parent vnets. */ 475 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 476 if (ifp->if_home_vnet != ifp->if_vnet) 477 if_vmove(ifp, ifp->if_home_vnet); 478 } 479 } 480 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 481 vnet_if_return, NULL); 482 #endif 483 484 485 static void * 486 if_grow(void) 487 { 488 int oldlim; 489 u_int n; 490 struct ifnet **e; 491 void *old; 492 493 old = NULL; 494 IFNET_WLOCK_ASSERT(); 495 oldlim = V_if_indexlim; 496 IFNET_WUNLOCK(); 497 n = (oldlim << 1) * sizeof(*e); 498 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 499 IFNET_WLOCK(); 500 if (V_if_indexlim != oldlim) { 501 free(e, M_IFNET); 502 return (NULL); 503 } 504 if (V_ifindex_table != NULL) { 505 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 506 old = V_ifindex_table; 507 } 508 V_if_indexlim <<= 1; 509 V_ifindex_table = e; 510 return (old); 511 } 512 513 /* 514 * Allocate a struct ifnet and an index for an interface. A layer 2 515 * common structure will also be allocated if an allocation routine is 516 * registered for the passed type. 517 */ 518 struct ifnet * 519 if_alloc_domain(u_char type, int numa_domain) 520 { 521 struct ifnet *ifp; 522 u_short idx; 523 void *old; 524 525 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 526 if (numa_domain == IF_NODOM) 527 ifp = malloc(sizeof(struct ifnet), M_IFNET, 528 M_WAITOK | M_ZERO); 529 else 530 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 531 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 532 restart: 533 IFNET_WLOCK(); 534 idx = ifindex_alloc(&old); 535 if (__predict_false(idx == USHRT_MAX)) { 536 IFNET_WUNLOCK(); 537 epoch_wait_preempt(net_epoch_preempt); 538 free(old, M_IFNET); 539 goto restart; 540 } 541 ifnet_setbyindex(idx, IFNET_HOLD); 542 IFNET_WUNLOCK(); 543 ifp->if_index = idx; 544 ifp->if_type = type; 545 ifp->if_alloctype = type; 546 ifp->if_numa_domain = numa_domain; 547 #ifdef VIMAGE 548 ifp->if_vnet = curvnet; 549 #endif 550 if (if_com_alloc[type] != NULL) { 551 ifp->if_l2com = if_com_alloc[type](type, ifp); 552 if (ifp->if_l2com == NULL) { 553 free(ifp, M_IFNET); 554 ifindex_free(idx); 555 return (NULL); 556 } 557 } 558 559 IF_ADDR_LOCK_INIT(ifp); 560 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 561 TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp); 562 ifp->if_afdata_initialized = 0; 563 IF_AFDATA_LOCK_INIT(ifp); 564 CK_STAILQ_INIT(&ifp->if_addrhead); 565 CK_STAILQ_INIT(&ifp->if_multiaddrs); 566 CK_STAILQ_INIT(&ifp->if_groups); 567 #ifdef MAC 568 mac_ifnet_init(ifp); 569 #endif 570 ifq_init(&ifp->if_snd, ifp); 571 572 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 573 for (int i = 0; i < IFCOUNTERS; i++) 574 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 575 ifp->if_get_counter = if_get_counter_default; 576 ifp->if_pcp = IFNET_PCP_NONE; 577 ifnet_setbyindex(ifp->if_index, ifp); 578 return (ifp); 579 } 580 581 struct ifnet * 582 if_alloc_dev(u_char type, device_t dev) 583 { 584 int numa_domain; 585 586 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 587 return (if_alloc_domain(type, IF_NODOM)); 588 return (if_alloc_domain(type, numa_domain)); 589 } 590 591 struct ifnet * 592 if_alloc(u_char type) 593 { 594 595 return (if_alloc_domain(type, IF_NODOM)); 596 } 597 /* 598 * Do the actual work of freeing a struct ifnet, and layer 2 common 599 * structure. This call is made when the last reference to an 600 * interface is released. 601 */ 602 static void 603 if_free_internal(struct ifnet *ifp) 604 { 605 606 KASSERT((ifp->if_flags & IFF_DYING), 607 ("if_free_internal: interface not dying")); 608 609 if (if_com_free[ifp->if_alloctype] != NULL) 610 if_com_free[ifp->if_alloctype](ifp->if_l2com, 611 ifp->if_alloctype); 612 613 #ifdef MAC 614 mac_ifnet_destroy(ifp); 615 #endif /* MAC */ 616 IF_AFDATA_DESTROY(ifp); 617 IF_ADDR_LOCK_DESTROY(ifp); 618 ifq_delete(&ifp->if_snd); 619 620 for (int i = 0; i < IFCOUNTERS; i++) 621 counter_u64_free(ifp->if_counters[i]); 622 623 free(ifp->if_description, M_IFDESCR); 624 free(ifp->if_hw_addr, M_IFADDR); 625 if (ifp->if_numa_domain == IF_NODOM) 626 free(ifp, M_IFNET); 627 else 628 free_domain(ifp, M_IFNET); 629 } 630 631 static void 632 if_destroy(epoch_context_t ctx) 633 { 634 struct ifnet *ifp; 635 636 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 637 if_free_internal(ifp); 638 } 639 640 /* 641 * Deregister an interface and free the associated storage. 642 */ 643 void 644 if_free(struct ifnet *ifp) 645 { 646 647 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 648 649 CURVNET_SET_QUIET(ifp->if_vnet); 650 IFNET_WLOCK(); 651 KASSERT(ifp == ifnet_byindex(ifp->if_index), 652 ("%s: freeing unallocated ifnet", ifp->if_xname)); 653 654 ifindex_free_locked(ifp->if_index); 655 IFNET_WUNLOCK(); 656 657 if (refcount_release(&ifp->if_refcount)) 658 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 659 CURVNET_RESTORE(); 660 } 661 662 /* 663 * Interfaces to keep an ifnet type-stable despite the possibility of the 664 * driver calling if_free(). If there are additional references, we defer 665 * freeing the underlying data structure. 666 */ 667 void 668 if_ref(struct ifnet *ifp) 669 { 670 671 /* We don't assert the ifnet list lock here, but arguably should. */ 672 refcount_acquire(&ifp->if_refcount); 673 } 674 675 void 676 if_rele(struct ifnet *ifp) 677 { 678 679 if (!refcount_release(&ifp->if_refcount)) 680 return; 681 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 682 } 683 684 void 685 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 686 { 687 688 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 689 690 if (ifq->ifq_maxlen == 0) 691 ifq->ifq_maxlen = ifqmaxlen; 692 693 ifq->altq_type = 0; 694 ifq->altq_disc = NULL; 695 ifq->altq_flags &= ALTQF_CANTCHANGE; 696 ifq->altq_tbr = NULL; 697 ifq->altq_ifp = ifp; 698 } 699 700 void 701 ifq_delete(struct ifaltq *ifq) 702 { 703 mtx_destroy(&ifq->ifq_mtx); 704 } 705 706 /* 707 * Perform generic interface initialization tasks and attach the interface 708 * to the list of "active" interfaces. If vmove flag is set on entry 709 * to if_attach_internal(), perform only a limited subset of initialization 710 * tasks, given that we are moving from one vnet to another an ifnet which 711 * has already been fully initialized. 712 * 713 * Note that if_detach_internal() removes group membership unconditionally 714 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 715 * Thus, when if_vmove() is applied to a cloned interface, group membership 716 * is lost while a cloned one always joins a group whose name is 717 * ifc->ifc_name. To recover this after if_detach_internal() and 718 * if_attach_internal(), the cloner should be specified to 719 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 720 * attempts to join a group whose name is ifc->ifc_name. 721 * 722 * XXX: 723 * - The decision to return void and thus require this function to 724 * succeed is questionable. 725 * - We should probably do more sanity checking. For instance we don't 726 * do anything to insure if_xname is unique or non-empty. 727 */ 728 void 729 if_attach(struct ifnet *ifp) 730 { 731 732 if_attach_internal(ifp, 0, NULL); 733 } 734 735 /* 736 * Compute the least common TSO limit. 737 */ 738 void 739 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 740 { 741 /* 742 * 1) If there is no limit currently, take the limit from 743 * the network adapter. 744 * 745 * 2) If the network adapter has a limit below the current 746 * limit, apply it. 747 */ 748 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 749 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 750 pmax->tsomaxbytes = ifp->if_hw_tsomax; 751 } 752 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 753 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 754 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 755 } 756 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 757 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 758 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 759 } 760 } 761 762 /* 763 * Update TSO limit of a network adapter. 764 * 765 * Returns zero if no change. Else non-zero. 766 */ 767 int 768 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 769 { 770 int retval = 0; 771 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 772 ifp->if_hw_tsomax = pmax->tsomaxbytes; 773 retval++; 774 } 775 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 776 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 777 retval++; 778 } 779 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 780 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 781 retval++; 782 } 783 return (retval); 784 } 785 786 static void 787 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 788 { 789 unsigned socksize, ifasize; 790 int namelen, masklen; 791 struct sockaddr_dl *sdl; 792 struct ifaddr *ifa; 793 794 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 795 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 796 ifp->if_xname); 797 798 #ifdef VIMAGE 799 ifp->if_vnet = curvnet; 800 if (ifp->if_home_vnet == NULL) 801 ifp->if_home_vnet = curvnet; 802 #endif 803 804 if_addgroup(ifp, IFG_ALL); 805 806 /* Restore group membership for cloned interfaces. */ 807 if (vmove && ifc != NULL) 808 if_clone_addgroup(ifp, ifc); 809 810 getmicrotime(&ifp->if_lastchange); 811 ifp->if_epoch = time_uptime; 812 813 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 814 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 815 ("transmit and qflush must both either be set or both be NULL")); 816 if (ifp->if_transmit == NULL) { 817 ifp->if_transmit = if_transmit; 818 ifp->if_qflush = if_qflush; 819 } 820 if (ifp->if_input == NULL) 821 ifp->if_input = if_input_default; 822 823 if (ifp->if_requestencap == NULL) 824 ifp->if_requestencap = if_requestencap_default; 825 826 if (!vmove) { 827 #ifdef MAC 828 mac_ifnet_create(ifp); 829 #endif 830 831 /* 832 * Create a Link Level name for this device. 833 */ 834 namelen = strlen(ifp->if_xname); 835 /* 836 * Always save enough space for any possiable name so we 837 * can do a rename in place later. 838 */ 839 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 840 socksize = masklen + ifp->if_addrlen; 841 if (socksize < sizeof(*sdl)) 842 socksize = sizeof(*sdl); 843 socksize = roundup2(socksize, sizeof(long)); 844 ifasize = sizeof(*ifa) + 2 * socksize; 845 ifa = ifa_alloc(ifasize, M_WAITOK); 846 sdl = (struct sockaddr_dl *)(ifa + 1); 847 sdl->sdl_len = socksize; 848 sdl->sdl_family = AF_LINK; 849 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 850 sdl->sdl_nlen = namelen; 851 sdl->sdl_index = ifp->if_index; 852 sdl->sdl_type = ifp->if_type; 853 ifp->if_addr = ifa; 854 ifa->ifa_ifp = ifp; 855 ifa->ifa_addr = (struct sockaddr *)sdl; 856 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 857 ifa->ifa_netmask = (struct sockaddr *)sdl; 858 sdl->sdl_len = masklen; 859 while (namelen != 0) 860 sdl->sdl_data[--namelen] = 0xff; 861 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 862 /* Reliably crash if used uninitialized. */ 863 ifp->if_broadcastaddr = NULL; 864 865 if (ifp->if_type == IFT_ETHER) { 866 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 867 M_WAITOK | M_ZERO); 868 } 869 870 #if defined(INET) || defined(INET6) 871 /* Use defaults for TSO, if nothing is set */ 872 if (ifp->if_hw_tsomax == 0 && 873 ifp->if_hw_tsomaxsegcount == 0 && 874 ifp->if_hw_tsomaxsegsize == 0) { 875 /* 876 * The TSO defaults needs to be such that an 877 * NFS mbuf list of 35 mbufs totalling just 878 * below 64K works and that a chain of mbufs 879 * can be defragged into at most 32 segments: 880 */ 881 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 882 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 883 ifp->if_hw_tsomaxsegcount = 35; 884 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 885 886 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 887 if (ifp->if_capabilities & IFCAP_TSO) { 888 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 889 ifp->if_hw_tsomax, 890 ifp->if_hw_tsomaxsegcount, 891 ifp->if_hw_tsomaxsegsize); 892 } 893 } 894 #endif 895 } 896 #ifdef VIMAGE 897 else { 898 /* 899 * Update the interface index in the link layer address 900 * of the interface. 901 */ 902 for (ifa = ifp->if_addr; ifa != NULL; 903 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 904 if (ifa->ifa_addr->sa_family == AF_LINK) { 905 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 906 sdl->sdl_index = ifp->if_index; 907 } 908 } 909 } 910 #endif 911 912 IFNET_WLOCK(); 913 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 914 #ifdef VIMAGE 915 curvnet->vnet_ifcnt++; 916 #endif 917 IFNET_WUNLOCK(); 918 919 if (domain_init_status >= 2) 920 if_attachdomain1(ifp); 921 922 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 923 if (IS_DEFAULT_VNET(curvnet)) 924 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 925 926 /* Announce the interface. */ 927 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 928 } 929 930 static void 931 if_epochalloc(void *dummy __unused) 932 { 933 934 net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT); 935 net_epoch = epoch_alloc("Net", 0); 936 } 937 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL); 938 939 static void 940 if_attachdomain(void *dummy) 941 { 942 struct ifnet *ifp; 943 944 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 945 if_attachdomain1(ifp); 946 } 947 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 948 if_attachdomain, NULL); 949 950 static void 951 if_attachdomain1(struct ifnet *ifp) 952 { 953 struct domain *dp; 954 955 /* 956 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 957 * cannot lock ifp->if_afdata initialization, entirely. 958 */ 959 IF_AFDATA_LOCK(ifp); 960 if (ifp->if_afdata_initialized >= domain_init_status) { 961 IF_AFDATA_UNLOCK(ifp); 962 log(LOG_WARNING, "%s called more than once on %s\n", 963 __func__, ifp->if_xname); 964 return; 965 } 966 ifp->if_afdata_initialized = domain_init_status; 967 IF_AFDATA_UNLOCK(ifp); 968 969 /* address family dependent data region */ 970 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 971 for (dp = domains; dp; dp = dp->dom_next) { 972 if (dp->dom_ifattach) 973 ifp->if_afdata[dp->dom_family] = 974 (*dp->dom_ifattach)(ifp); 975 } 976 } 977 978 /* 979 * Remove any unicast or broadcast network addresses from an interface. 980 */ 981 void 982 if_purgeaddrs(struct ifnet *ifp) 983 { 984 struct ifaddr *ifa; 985 986 while (1) { 987 struct epoch_tracker et; 988 989 NET_EPOCH_ENTER(et); 990 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 991 if (ifa->ifa_addr->sa_family != AF_LINK) 992 break; 993 } 994 NET_EPOCH_EXIT(et); 995 996 if (ifa == NULL) 997 break; 998 #ifdef INET 999 /* XXX: Ugly!! ad hoc just for INET */ 1000 if (ifa->ifa_addr->sa_family == AF_INET) { 1001 struct ifaliasreq ifr; 1002 1003 bzero(&ifr, sizeof(ifr)); 1004 ifr.ifra_addr = *ifa->ifa_addr; 1005 if (ifa->ifa_dstaddr) 1006 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1007 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1008 NULL) == 0) 1009 continue; 1010 } 1011 #endif /* INET */ 1012 #ifdef INET6 1013 if (ifa->ifa_addr->sa_family == AF_INET6) { 1014 in6_purgeaddr(ifa); 1015 /* ifp_addrhead is already updated */ 1016 continue; 1017 } 1018 #endif /* INET6 */ 1019 IF_ADDR_WLOCK(ifp); 1020 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1021 IF_ADDR_WUNLOCK(ifp); 1022 ifa_free(ifa); 1023 } 1024 } 1025 1026 /* 1027 * Remove any multicast network addresses from an interface when an ifnet 1028 * is going away. 1029 */ 1030 static void 1031 if_purgemaddrs(struct ifnet *ifp) 1032 { 1033 struct ifmultiaddr *ifma; 1034 1035 IF_ADDR_WLOCK(ifp); 1036 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1037 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1038 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1039 if_delmulti_locked(ifp, ifma, 1); 1040 } 1041 IF_ADDR_WUNLOCK(ifp); 1042 } 1043 1044 /* 1045 * Detach an interface, removing it from the list of "active" interfaces. 1046 * If vmove flag is set on entry to if_detach_internal(), perform only a 1047 * limited subset of cleanup tasks, given that we are moving an ifnet from 1048 * one vnet to another, where it must be fully operational. 1049 * 1050 * XXXRW: There are some significant questions about event ordering, and 1051 * how to prevent things from starting to use the interface during detach. 1052 */ 1053 void 1054 if_detach(struct ifnet *ifp) 1055 { 1056 1057 CURVNET_SET_QUIET(ifp->if_vnet); 1058 if_detach_internal(ifp, 0, NULL); 1059 CURVNET_RESTORE(); 1060 } 1061 1062 /* 1063 * The vmove flag, if set, indicates that we are called from a callpath 1064 * that is moving an interface to a different vnet instance. 1065 * 1066 * The shutdown flag, if set, indicates that we are called in the 1067 * process of shutting down a vnet instance. Currently only the 1068 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1069 * on a vnet instance shutdown without this flag being set, e.g., when 1070 * the cloned interfaces are destoyed as first thing of teardown. 1071 */ 1072 static int 1073 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1074 { 1075 struct ifaddr *ifa; 1076 int i; 1077 struct domain *dp; 1078 struct ifnet *iter; 1079 int found = 0; 1080 #ifdef VIMAGE 1081 bool shutdown; 1082 1083 shutdown = ifp->if_vnet->vnet_shutdown; 1084 #endif 1085 IFNET_WLOCK(); 1086 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1087 if (iter == ifp) { 1088 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1089 if (!vmove) 1090 ifp->if_flags |= IFF_DYING; 1091 found = 1; 1092 break; 1093 } 1094 IFNET_WUNLOCK(); 1095 if (!found) { 1096 /* 1097 * While we would want to panic here, we cannot 1098 * guarantee that the interface is indeed still on 1099 * the list given we don't hold locks all the way. 1100 */ 1101 return (ENOENT); 1102 #if 0 1103 if (vmove) 1104 panic("%s: ifp=%p not on the ifnet tailq %p", 1105 __func__, ifp, &V_ifnet); 1106 else 1107 return; /* XXX this should panic as well? */ 1108 #endif 1109 } 1110 1111 /* 1112 * At this point we know the interface still was on the ifnet list 1113 * and we removed it so we are in a stable state. 1114 */ 1115 #ifdef VIMAGE 1116 curvnet->vnet_ifcnt--; 1117 #endif 1118 epoch_wait_preempt(net_epoch_preempt); 1119 1120 /* 1121 * Ensure all pending EPOCH(9) callbacks have been executed. This 1122 * fixes issues about late destruction of multicast options 1123 * which lead to leave group calls, which in turn access the 1124 * belonging ifnet structure: 1125 */ 1126 epoch_drain_callbacks(net_epoch_preempt); 1127 1128 /* 1129 * In any case (destroy or vmove) detach us from the groups 1130 * and remove/wait for pending events on the taskq. 1131 * XXX-BZ in theory an interface could still enqueue a taskq change? 1132 */ 1133 if_delgroups(ifp); 1134 1135 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1136 taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask); 1137 1138 /* 1139 * Check if this is a cloned interface or not. Must do even if 1140 * shutting down as a if_vmove_reclaim() would move the ifp and 1141 * the if_clone_addgroup() will have a corrupted string overwise 1142 * from a gibberish pointer. 1143 */ 1144 if (vmove && ifcp != NULL) 1145 *ifcp = if_clone_findifc(ifp); 1146 1147 if_down(ifp); 1148 1149 #ifdef VIMAGE 1150 /* 1151 * On VNET shutdown abort here as the stack teardown will do all 1152 * the work top-down for us. 1153 */ 1154 if (shutdown) { 1155 /* Give interface users the chance to clean up. */ 1156 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1157 1158 /* 1159 * In case of a vmove we are done here without error. 1160 * If we would signal an error it would lead to the same 1161 * abort as if we did not find the ifnet anymore. 1162 * if_detach() calls us in void context and does not care 1163 * about an early abort notification, so life is splendid :) 1164 */ 1165 goto finish_vnet_shutdown; 1166 } 1167 #endif 1168 1169 /* 1170 * At this point we are not tearing down a VNET and are either 1171 * going to destroy or vmove the interface and have to cleanup 1172 * accordingly. 1173 */ 1174 1175 /* 1176 * Remove routes and flush queues. 1177 */ 1178 #ifdef ALTQ 1179 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1180 altq_disable(&ifp->if_snd); 1181 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1182 altq_detach(&ifp->if_snd); 1183 #endif 1184 1185 if_purgeaddrs(ifp); 1186 1187 #ifdef INET 1188 in_ifdetach(ifp); 1189 #endif 1190 1191 #ifdef INET6 1192 /* 1193 * Remove all IPv6 kernel structs related to ifp. This should be done 1194 * before removing routing entries below, since IPv6 interface direct 1195 * routes are expected to be removed by the IPv6-specific kernel API. 1196 * Otherwise, the kernel will detect some inconsistency and bark it. 1197 */ 1198 in6_ifdetach(ifp); 1199 #endif 1200 if_purgemaddrs(ifp); 1201 1202 /* Announce that the interface is gone. */ 1203 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1204 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1205 if (IS_DEFAULT_VNET(curvnet)) 1206 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1207 1208 if (!vmove) { 1209 /* 1210 * Prevent further calls into the device driver via ifnet. 1211 */ 1212 if_dead(ifp); 1213 1214 /* 1215 * Clean up all addresses. 1216 */ 1217 IF_ADDR_WLOCK(ifp); 1218 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1219 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1220 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1221 IF_ADDR_WUNLOCK(ifp); 1222 ifa_free(ifa); 1223 } else 1224 IF_ADDR_WUNLOCK(ifp); 1225 } 1226 1227 rt_flushifroutes(ifp); 1228 1229 #ifdef VIMAGE 1230 finish_vnet_shutdown: 1231 #endif 1232 /* 1233 * We cannot hold the lock over dom_ifdetach calls as they might 1234 * sleep, for example trying to drain a callout, thus open up the 1235 * theoretical race with re-attaching. 1236 */ 1237 IF_AFDATA_LOCK(ifp); 1238 i = ifp->if_afdata_initialized; 1239 ifp->if_afdata_initialized = 0; 1240 IF_AFDATA_UNLOCK(ifp); 1241 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1242 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1243 (*dp->dom_ifdetach)(ifp, 1244 ifp->if_afdata[dp->dom_family]); 1245 ifp->if_afdata[dp->dom_family] = NULL; 1246 } 1247 } 1248 1249 return (0); 1250 } 1251 1252 #ifdef VIMAGE 1253 /* 1254 * if_vmove() performs a limited version of if_detach() in current 1255 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1256 * An attempt is made to shrink if_index in current vnet, find an 1257 * unused if_index in target vnet and calls if_grow() if necessary, 1258 * and finally find an unused if_xname for the target vnet. 1259 */ 1260 static void 1261 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1262 { 1263 struct if_clone *ifc; 1264 #ifdef DEV_BPF 1265 u_int bif_dlt, bif_hdrlen; 1266 #endif 1267 void *old; 1268 int rc; 1269 1270 #ifdef DEV_BPF 1271 /* 1272 * if_detach_internal() will call the eventhandler to notify 1273 * interface departure. That will detach if_bpf. We need to 1274 * safe the dlt and hdrlen so we can re-attach it later. 1275 */ 1276 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1277 #endif 1278 1279 /* 1280 * Detach from current vnet, but preserve LLADDR info, do not 1281 * mark as dead etc. so that the ifnet can be reattached later. 1282 * If we cannot find it, we lost the race to someone else. 1283 */ 1284 rc = if_detach_internal(ifp, 1, &ifc); 1285 if (rc != 0) 1286 return; 1287 1288 /* 1289 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1290 * the if_index for that vnet if possible. 1291 * 1292 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1293 * or we'd lock on one vnet and unlock on another. 1294 */ 1295 IFNET_WLOCK(); 1296 ifindex_free_locked(ifp->if_index); 1297 IFNET_WUNLOCK(); 1298 1299 /* 1300 * Perform interface-specific reassignment tasks, if provided by 1301 * the driver. 1302 */ 1303 if (ifp->if_reassign != NULL) 1304 ifp->if_reassign(ifp, new_vnet, NULL); 1305 1306 /* 1307 * Switch to the context of the target vnet. 1308 */ 1309 CURVNET_SET_QUIET(new_vnet); 1310 restart: 1311 IFNET_WLOCK(); 1312 ifp->if_index = ifindex_alloc(&old); 1313 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1314 IFNET_WUNLOCK(); 1315 epoch_wait_preempt(net_epoch_preempt); 1316 free(old, M_IFNET); 1317 goto restart; 1318 } 1319 ifnet_setbyindex(ifp->if_index, ifp); 1320 IFNET_WUNLOCK(); 1321 1322 if_attach_internal(ifp, 1, ifc); 1323 1324 #ifdef DEV_BPF 1325 if (ifp->if_bpf == NULL) 1326 bpfattach(ifp, bif_dlt, bif_hdrlen); 1327 #endif 1328 1329 CURVNET_RESTORE(); 1330 } 1331 1332 /* 1333 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1334 */ 1335 static int 1336 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1337 { 1338 struct prison *pr; 1339 struct ifnet *difp; 1340 1341 /* Try to find the prison within our visibility. */ 1342 sx_slock(&allprison_lock); 1343 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1344 sx_sunlock(&allprison_lock); 1345 if (pr == NULL) 1346 return (ENXIO); 1347 prison_hold_locked(pr); 1348 mtx_unlock(&pr->pr_mtx); 1349 1350 /* Do not try to move the iface from and to the same prison. */ 1351 if (pr->pr_vnet == ifp->if_vnet) { 1352 prison_free(pr); 1353 return (EEXIST); 1354 } 1355 1356 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1357 /* XXX Lock interfaces to avoid races. */ 1358 CURVNET_SET_QUIET(pr->pr_vnet); 1359 difp = ifunit(ifname); 1360 if (difp != NULL) { 1361 CURVNET_RESTORE(); 1362 prison_free(pr); 1363 return (EEXIST); 1364 } 1365 1366 /* Make sure the VNET is stable. */ 1367 if (ifp->if_vnet->vnet_shutdown) { 1368 CURVNET_RESTORE(); 1369 prison_free(pr); 1370 return (EBUSY); 1371 } 1372 CURVNET_RESTORE(); 1373 1374 /* Move the interface into the child jail/vnet. */ 1375 if_vmove(ifp, pr->pr_vnet); 1376 1377 /* Report the new if_xname back to the userland. */ 1378 sprintf(ifname, "%s", ifp->if_xname); 1379 1380 prison_free(pr); 1381 return (0); 1382 } 1383 1384 static int 1385 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1386 { 1387 struct prison *pr; 1388 struct vnet *vnet_dst; 1389 struct ifnet *ifp; 1390 1391 /* Try to find the prison within our visibility. */ 1392 sx_slock(&allprison_lock); 1393 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1394 sx_sunlock(&allprison_lock); 1395 if (pr == NULL) 1396 return (ENXIO); 1397 prison_hold_locked(pr); 1398 mtx_unlock(&pr->pr_mtx); 1399 1400 /* Make sure the named iface exists in the source prison/vnet. */ 1401 CURVNET_SET(pr->pr_vnet); 1402 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1403 if (ifp == NULL) { 1404 CURVNET_RESTORE(); 1405 prison_free(pr); 1406 return (ENXIO); 1407 } 1408 1409 /* Do not try to move the iface from and to the same prison. */ 1410 vnet_dst = TD_TO_VNET(td); 1411 if (vnet_dst == ifp->if_vnet) { 1412 CURVNET_RESTORE(); 1413 prison_free(pr); 1414 return (EEXIST); 1415 } 1416 1417 /* Make sure the VNET is stable. */ 1418 if (ifp->if_vnet->vnet_shutdown) { 1419 CURVNET_RESTORE(); 1420 prison_free(pr); 1421 return (EBUSY); 1422 } 1423 1424 /* Get interface back from child jail/vnet. */ 1425 if_vmove(ifp, vnet_dst); 1426 CURVNET_RESTORE(); 1427 1428 /* Report the new if_xname back to the userland. */ 1429 sprintf(ifname, "%s", ifp->if_xname); 1430 1431 prison_free(pr); 1432 return (0); 1433 } 1434 #endif /* VIMAGE */ 1435 1436 /* 1437 * Add a group to an interface 1438 */ 1439 int 1440 if_addgroup(struct ifnet *ifp, const char *groupname) 1441 { 1442 struct ifg_list *ifgl; 1443 struct ifg_group *ifg = NULL; 1444 struct ifg_member *ifgm; 1445 int new = 0; 1446 1447 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1448 groupname[strlen(groupname) - 1] <= '9') 1449 return (EINVAL); 1450 1451 IFNET_WLOCK(); 1452 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1453 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1454 IFNET_WUNLOCK(); 1455 return (EEXIST); 1456 } 1457 1458 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1459 M_NOWAIT)) == NULL) { 1460 IFNET_WUNLOCK(); 1461 return (ENOMEM); 1462 } 1463 1464 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1465 M_TEMP, M_NOWAIT)) == NULL) { 1466 free(ifgl, M_TEMP); 1467 IFNET_WUNLOCK(); 1468 return (ENOMEM); 1469 } 1470 1471 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1472 if (!strcmp(ifg->ifg_group, groupname)) 1473 break; 1474 1475 if (ifg == NULL) { 1476 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1477 M_TEMP, M_NOWAIT)) == NULL) { 1478 free(ifgl, M_TEMP); 1479 free(ifgm, M_TEMP); 1480 IFNET_WUNLOCK(); 1481 return (ENOMEM); 1482 } 1483 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1484 ifg->ifg_refcnt = 0; 1485 CK_STAILQ_INIT(&ifg->ifg_members); 1486 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1487 new = 1; 1488 } 1489 1490 ifg->ifg_refcnt++; 1491 ifgl->ifgl_group = ifg; 1492 ifgm->ifgm_ifp = ifp; 1493 1494 IF_ADDR_WLOCK(ifp); 1495 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1496 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1497 IF_ADDR_WUNLOCK(ifp); 1498 1499 IFNET_WUNLOCK(); 1500 1501 if (new) 1502 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1503 EVENTHANDLER_INVOKE(group_change_event, groupname); 1504 1505 return (0); 1506 } 1507 1508 /* 1509 * Remove a group from an interface 1510 */ 1511 int 1512 if_delgroup(struct ifnet *ifp, const char *groupname) 1513 { 1514 struct ifg_list *ifgl; 1515 struct ifg_member *ifgm; 1516 int freeifgl; 1517 1518 IFNET_WLOCK(); 1519 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1520 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1521 break; 1522 if (ifgl == NULL) { 1523 IFNET_WUNLOCK(); 1524 return (ENOENT); 1525 } 1526 1527 freeifgl = 0; 1528 IF_ADDR_WLOCK(ifp); 1529 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1530 IF_ADDR_WUNLOCK(ifp); 1531 1532 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1533 if (ifgm->ifgm_ifp == ifp) 1534 break; 1535 1536 if (ifgm != NULL) 1537 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1538 1539 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1540 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1541 freeifgl = 1; 1542 } 1543 IFNET_WUNLOCK(); 1544 1545 epoch_wait_preempt(net_epoch_preempt); 1546 if (freeifgl) { 1547 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1548 free(ifgl->ifgl_group, M_TEMP); 1549 } 1550 free(ifgm, M_TEMP); 1551 free(ifgl, M_TEMP); 1552 1553 EVENTHANDLER_INVOKE(group_change_event, groupname); 1554 1555 return (0); 1556 } 1557 1558 /* 1559 * Remove an interface from all groups 1560 */ 1561 static void 1562 if_delgroups(struct ifnet *ifp) 1563 { 1564 struct ifg_list *ifgl; 1565 struct ifg_member *ifgm; 1566 char groupname[IFNAMSIZ]; 1567 int ifglfree; 1568 1569 IFNET_WLOCK(); 1570 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1571 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1572 1573 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1574 1575 IF_ADDR_WLOCK(ifp); 1576 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1577 IF_ADDR_WUNLOCK(ifp); 1578 1579 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1580 if (ifgm->ifgm_ifp == ifp) 1581 break; 1582 1583 if (ifgm != NULL) 1584 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1585 ifgm_next); 1586 ifglfree = 0; 1587 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1588 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1589 ifglfree = 1; 1590 } 1591 1592 IFNET_WUNLOCK(); 1593 epoch_wait_preempt(net_epoch_preempt); 1594 free(ifgm, M_TEMP); 1595 if (ifglfree) { 1596 EVENTHANDLER_INVOKE(group_detach_event, 1597 ifgl->ifgl_group); 1598 free(ifgl->ifgl_group, M_TEMP); 1599 } 1600 EVENTHANDLER_INVOKE(group_change_event, groupname); 1601 1602 IFNET_WLOCK(); 1603 } 1604 IFNET_WUNLOCK(); 1605 } 1606 1607 static char * 1608 ifgr_group_get(void *ifgrp) 1609 { 1610 union ifgroupreq_union *ifgrup; 1611 1612 ifgrup = ifgrp; 1613 #ifdef COMPAT_FREEBSD32 1614 if (SV_CURPROC_FLAG(SV_ILP32)) 1615 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1616 #endif 1617 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1618 } 1619 1620 static struct ifg_req * 1621 ifgr_groups_get(void *ifgrp) 1622 { 1623 union ifgroupreq_union *ifgrup; 1624 1625 ifgrup = ifgrp; 1626 #ifdef COMPAT_FREEBSD32 1627 if (SV_CURPROC_FLAG(SV_ILP32)) 1628 return ((struct ifg_req *)(uintptr_t) 1629 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1630 #endif 1631 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1632 } 1633 1634 /* 1635 * Stores all groups from an interface in memory pointed to by ifgr. 1636 */ 1637 static int 1638 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1639 { 1640 int len, error; 1641 struct ifg_list *ifgl; 1642 struct ifg_req ifgrq, *ifgp; 1643 1644 NET_EPOCH_ASSERT(); 1645 1646 if (ifgr->ifgr_len == 0) { 1647 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1648 ifgr->ifgr_len += sizeof(struct ifg_req); 1649 return (0); 1650 } 1651 1652 len = ifgr->ifgr_len; 1653 ifgp = ifgr_groups_get(ifgr); 1654 /* XXX: wire */ 1655 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1656 if (len < sizeof(ifgrq)) 1657 return (EINVAL); 1658 bzero(&ifgrq, sizeof ifgrq); 1659 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1660 sizeof(ifgrq.ifgrq_group)); 1661 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) 1662 return (error); 1663 len -= sizeof(ifgrq); 1664 ifgp++; 1665 } 1666 1667 return (0); 1668 } 1669 1670 /* 1671 * Stores all members of a group in memory pointed to by igfr 1672 */ 1673 static int 1674 if_getgroupmembers(struct ifgroupreq *ifgr) 1675 { 1676 struct ifg_group *ifg; 1677 struct ifg_member *ifgm; 1678 struct ifg_req ifgrq, *ifgp; 1679 int len, error; 1680 1681 IFNET_RLOCK(); 1682 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1683 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1684 break; 1685 if (ifg == NULL) { 1686 IFNET_RUNLOCK(); 1687 return (ENOENT); 1688 } 1689 1690 if (ifgr->ifgr_len == 0) { 1691 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1692 ifgr->ifgr_len += sizeof(ifgrq); 1693 IFNET_RUNLOCK(); 1694 return (0); 1695 } 1696 1697 len = ifgr->ifgr_len; 1698 ifgp = ifgr_groups_get(ifgr); 1699 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1700 if (len < sizeof(ifgrq)) { 1701 IFNET_RUNLOCK(); 1702 return (EINVAL); 1703 } 1704 bzero(&ifgrq, sizeof ifgrq); 1705 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1706 sizeof(ifgrq.ifgrq_member)); 1707 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1708 IFNET_RUNLOCK(); 1709 return (error); 1710 } 1711 len -= sizeof(ifgrq); 1712 ifgp++; 1713 } 1714 IFNET_RUNLOCK(); 1715 1716 return (0); 1717 } 1718 1719 /* 1720 * Return counter values from counter(9)s stored in ifnet. 1721 */ 1722 uint64_t 1723 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1724 { 1725 1726 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1727 1728 return (counter_u64_fetch(ifp->if_counters[cnt])); 1729 } 1730 1731 /* 1732 * Increase an ifnet counter. Usually used for counters shared 1733 * between the stack and a driver, but function supports them all. 1734 */ 1735 void 1736 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1737 { 1738 1739 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1740 1741 counter_u64_add(ifp->if_counters[cnt], inc); 1742 } 1743 1744 /* 1745 * Copy data from ifnet to userland API structure if_data. 1746 */ 1747 void 1748 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1749 { 1750 1751 ifd->ifi_type = ifp->if_type; 1752 ifd->ifi_physical = 0; 1753 ifd->ifi_addrlen = ifp->if_addrlen; 1754 ifd->ifi_hdrlen = ifp->if_hdrlen; 1755 ifd->ifi_link_state = ifp->if_link_state; 1756 ifd->ifi_vhid = 0; 1757 ifd->ifi_datalen = sizeof(struct if_data); 1758 ifd->ifi_mtu = ifp->if_mtu; 1759 ifd->ifi_metric = ifp->if_metric; 1760 ifd->ifi_baudrate = ifp->if_baudrate; 1761 ifd->ifi_hwassist = ifp->if_hwassist; 1762 ifd->ifi_epoch = ifp->if_epoch; 1763 ifd->ifi_lastchange = ifp->if_lastchange; 1764 1765 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1766 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1767 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1768 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1769 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1770 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1771 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1772 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1773 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1774 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1775 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1776 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1777 } 1778 1779 /* 1780 * Initialization, destruction and refcounting functions for ifaddrs. 1781 */ 1782 struct ifaddr * 1783 ifa_alloc(size_t size, int flags) 1784 { 1785 struct ifaddr *ifa; 1786 1787 KASSERT(size >= sizeof(struct ifaddr), 1788 ("%s: invalid size %zu", __func__, size)); 1789 1790 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1791 if (ifa == NULL) 1792 return (NULL); 1793 1794 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1795 goto fail; 1796 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1797 goto fail; 1798 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1799 goto fail; 1800 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1801 goto fail; 1802 1803 refcount_init(&ifa->ifa_refcnt, 1); 1804 1805 return (ifa); 1806 1807 fail: 1808 /* free(NULL) is okay */ 1809 counter_u64_free(ifa->ifa_opackets); 1810 counter_u64_free(ifa->ifa_ipackets); 1811 counter_u64_free(ifa->ifa_obytes); 1812 counter_u64_free(ifa->ifa_ibytes); 1813 free(ifa, M_IFADDR); 1814 1815 return (NULL); 1816 } 1817 1818 void 1819 ifa_ref(struct ifaddr *ifa) 1820 { 1821 1822 refcount_acquire(&ifa->ifa_refcnt); 1823 } 1824 1825 static void 1826 ifa_destroy(epoch_context_t ctx) 1827 { 1828 struct ifaddr *ifa; 1829 1830 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1831 counter_u64_free(ifa->ifa_opackets); 1832 counter_u64_free(ifa->ifa_ipackets); 1833 counter_u64_free(ifa->ifa_obytes); 1834 counter_u64_free(ifa->ifa_ibytes); 1835 free(ifa, M_IFADDR); 1836 } 1837 1838 void 1839 ifa_free(struct ifaddr *ifa) 1840 { 1841 1842 if (refcount_release(&ifa->ifa_refcnt)) 1843 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1844 } 1845 1846 1847 static int 1848 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1849 struct sockaddr *ia) 1850 { 1851 struct epoch_tracker et; 1852 int error; 1853 struct rt_addrinfo info; 1854 struct sockaddr_dl null_sdl; 1855 struct ifnet *ifp; 1856 1857 ifp = ifa->ifa_ifp; 1858 1859 bzero(&info, sizeof(info)); 1860 if (cmd != RTM_DELETE) 1861 info.rti_ifp = V_loif; 1862 if (cmd == RTM_ADD) { 1863 /* explicitly specify (loopback) ifa */ 1864 if (info.rti_ifp != NULL) { 1865 NET_EPOCH_ENTER(et); 1866 info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1867 if (info.rti_ifa != NULL) 1868 ifa_ref(info.rti_ifa); 1869 NET_EPOCH_EXIT(et); 1870 } 1871 } 1872 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1873 info.rti_info[RTAX_DST] = ia; 1874 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1875 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1876 1877 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1878 1879 if (error != 0 && 1880 !(cmd == RTM_ADD && error == EEXIST) && 1881 !(cmd == RTM_DELETE && error == ENOENT)) 1882 if_printf(ifp, "%s failed: %d\n", otype, error); 1883 1884 return (error); 1885 } 1886 1887 int 1888 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1889 { 1890 1891 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1892 } 1893 1894 int 1895 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1896 { 1897 1898 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1899 } 1900 1901 int 1902 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1903 { 1904 1905 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1906 } 1907 1908 /* 1909 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1910 * structs used to represent other address families, it is necessary 1911 * to perform a different comparison. 1912 */ 1913 1914 #define sa_dl_equal(a1, a2) \ 1915 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1916 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1917 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1918 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1919 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1920 1921 /* 1922 * Locate an interface based on a complete address. 1923 */ 1924 /*ARGSUSED*/ 1925 struct ifaddr * 1926 ifa_ifwithaddr(const struct sockaddr *addr) 1927 { 1928 struct ifnet *ifp; 1929 struct ifaddr *ifa; 1930 1931 NET_EPOCH_ASSERT(); 1932 1933 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1934 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1935 if (ifa->ifa_addr->sa_family != addr->sa_family) 1936 continue; 1937 if (sa_equal(addr, ifa->ifa_addr)) { 1938 goto done; 1939 } 1940 /* IP6 doesn't have broadcast */ 1941 if ((ifp->if_flags & IFF_BROADCAST) && 1942 ifa->ifa_broadaddr && 1943 ifa->ifa_broadaddr->sa_len != 0 && 1944 sa_equal(ifa->ifa_broadaddr, addr)) { 1945 goto done; 1946 } 1947 } 1948 } 1949 ifa = NULL; 1950 done: 1951 return (ifa); 1952 } 1953 1954 int 1955 ifa_ifwithaddr_check(const struct sockaddr *addr) 1956 { 1957 struct epoch_tracker et; 1958 int rc; 1959 1960 NET_EPOCH_ENTER(et); 1961 rc = (ifa_ifwithaddr(addr) != NULL); 1962 NET_EPOCH_EXIT(et); 1963 return (rc); 1964 } 1965 1966 /* 1967 * Locate an interface based on the broadcast address. 1968 */ 1969 /* ARGSUSED */ 1970 struct ifaddr * 1971 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1972 { 1973 struct ifnet *ifp; 1974 struct ifaddr *ifa; 1975 1976 MPASS(in_epoch(net_epoch_preempt)); 1977 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1978 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1979 continue; 1980 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1981 if (ifa->ifa_addr->sa_family != addr->sa_family) 1982 continue; 1983 if ((ifp->if_flags & IFF_BROADCAST) && 1984 ifa->ifa_broadaddr && 1985 ifa->ifa_broadaddr->sa_len != 0 && 1986 sa_equal(ifa->ifa_broadaddr, addr)) { 1987 goto done; 1988 } 1989 } 1990 } 1991 ifa = NULL; 1992 done: 1993 return (ifa); 1994 } 1995 1996 /* 1997 * Locate the point to point interface with a given destination address. 1998 */ 1999 /*ARGSUSED*/ 2000 struct ifaddr * 2001 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2002 { 2003 struct ifnet *ifp; 2004 struct ifaddr *ifa; 2005 2006 MPASS(in_epoch(net_epoch_preempt)); 2007 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2008 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2009 continue; 2010 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2011 continue; 2012 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2013 if (ifa->ifa_addr->sa_family != addr->sa_family) 2014 continue; 2015 if (ifa->ifa_dstaddr != NULL && 2016 sa_equal(addr, ifa->ifa_dstaddr)) { 2017 goto done; 2018 } 2019 } 2020 } 2021 ifa = NULL; 2022 done: 2023 return (ifa); 2024 } 2025 2026 /* 2027 * Find an interface on a specific network. If many, choice 2028 * is most specific found. 2029 */ 2030 struct ifaddr * 2031 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2032 { 2033 struct ifnet *ifp; 2034 struct ifaddr *ifa; 2035 struct ifaddr *ifa_maybe = NULL; 2036 u_int af = addr->sa_family; 2037 const char *addr_data = addr->sa_data, *cplim; 2038 2039 MPASS(in_epoch(net_epoch_preempt)); 2040 /* 2041 * AF_LINK addresses can be looked up directly by their index number, 2042 * so do that if we can. 2043 */ 2044 if (af == AF_LINK) { 2045 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2046 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2047 return (ifaddr_byindex(sdl->sdl_index)); 2048 } 2049 2050 /* 2051 * Scan though each interface, looking for ones that have addresses 2052 * in this address family and the requested fib. 2053 */ 2054 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2055 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2056 continue; 2057 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2058 const char *cp, *cp2, *cp3; 2059 2060 if (ifa->ifa_addr->sa_family != af) 2061 next: continue; 2062 if (af == AF_INET && 2063 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2064 /* 2065 * This is a bit broken as it doesn't 2066 * take into account that the remote end may 2067 * be a single node in the network we are 2068 * looking for. 2069 * The trouble is that we don't know the 2070 * netmask for the remote end. 2071 */ 2072 if (ifa->ifa_dstaddr != NULL && 2073 sa_equal(addr, ifa->ifa_dstaddr)) { 2074 goto done; 2075 } 2076 } else { 2077 /* 2078 * Scan all the bits in the ifa's address. 2079 * If a bit dissagrees with what we are 2080 * looking for, mask it with the netmask 2081 * to see if it really matters. 2082 * (A byte at a time) 2083 */ 2084 if (ifa->ifa_netmask == 0) 2085 continue; 2086 cp = addr_data; 2087 cp2 = ifa->ifa_addr->sa_data; 2088 cp3 = ifa->ifa_netmask->sa_data; 2089 cplim = ifa->ifa_netmask->sa_len 2090 + (char *)ifa->ifa_netmask; 2091 while (cp3 < cplim) 2092 if ((*cp++ ^ *cp2++) & *cp3++) 2093 goto next; /* next address! */ 2094 /* 2095 * If the netmask of what we just found 2096 * is more specific than what we had before 2097 * (if we had one), or if the virtual status 2098 * of new prefix is better than of the old one, 2099 * then remember the new one before continuing 2100 * to search for an even better one. 2101 */ 2102 if (ifa_maybe == NULL || 2103 ifa_preferred(ifa_maybe, ifa) || 2104 rn_refines((caddr_t)ifa->ifa_netmask, 2105 (caddr_t)ifa_maybe->ifa_netmask)) { 2106 ifa_maybe = ifa; 2107 } 2108 } 2109 } 2110 } 2111 ifa = ifa_maybe; 2112 ifa_maybe = NULL; 2113 done: 2114 return (ifa); 2115 } 2116 2117 /* 2118 * Find an interface address specific to an interface best matching 2119 * a given address. 2120 */ 2121 struct ifaddr * 2122 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2123 { 2124 struct ifaddr *ifa; 2125 const char *cp, *cp2, *cp3; 2126 char *cplim; 2127 struct ifaddr *ifa_maybe = NULL; 2128 u_int af = addr->sa_family; 2129 2130 if (af >= AF_MAX) 2131 return (NULL); 2132 2133 MPASS(in_epoch(net_epoch_preempt)); 2134 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2135 if (ifa->ifa_addr->sa_family != af) 2136 continue; 2137 if (ifa_maybe == NULL) 2138 ifa_maybe = ifa; 2139 if (ifa->ifa_netmask == 0) { 2140 if (sa_equal(addr, ifa->ifa_addr) || 2141 (ifa->ifa_dstaddr && 2142 sa_equal(addr, ifa->ifa_dstaddr))) 2143 goto done; 2144 continue; 2145 } 2146 if (ifp->if_flags & IFF_POINTOPOINT) { 2147 if (sa_equal(addr, ifa->ifa_dstaddr)) 2148 goto done; 2149 } else { 2150 cp = addr->sa_data; 2151 cp2 = ifa->ifa_addr->sa_data; 2152 cp3 = ifa->ifa_netmask->sa_data; 2153 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2154 for (; cp3 < cplim; cp3++) 2155 if ((*cp++ ^ *cp2++) & *cp3) 2156 break; 2157 if (cp3 == cplim) 2158 goto done; 2159 } 2160 } 2161 ifa = ifa_maybe; 2162 done: 2163 return (ifa); 2164 } 2165 2166 /* 2167 * See whether new ifa is better than current one: 2168 * 1) A non-virtual one is preferred over virtual. 2169 * 2) A virtual in master state preferred over any other state. 2170 * 2171 * Used in several address selecting functions. 2172 */ 2173 int 2174 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2175 { 2176 2177 return (cur->ifa_carp && (!next->ifa_carp || 2178 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2179 } 2180 2181 struct sockaddr_dl * 2182 link_alloc_sdl(size_t size, int flags) 2183 { 2184 2185 return (malloc(size, M_TEMP, flags)); 2186 } 2187 2188 void 2189 link_free_sdl(struct sockaddr *sa) 2190 { 2191 free(sa, M_TEMP); 2192 } 2193 2194 /* 2195 * Fills in given sdl with interface basic info. 2196 * Returns pointer to filled sdl. 2197 */ 2198 struct sockaddr_dl * 2199 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2200 { 2201 struct sockaddr_dl *sdl; 2202 2203 sdl = (struct sockaddr_dl *)paddr; 2204 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2205 sdl->sdl_len = sizeof(struct sockaddr_dl); 2206 sdl->sdl_family = AF_LINK; 2207 sdl->sdl_index = ifp->if_index; 2208 sdl->sdl_type = iftype; 2209 2210 return (sdl); 2211 } 2212 2213 /* 2214 * Mark an interface down and notify protocols of 2215 * the transition. 2216 */ 2217 static void 2218 if_unroute(struct ifnet *ifp, int flag, int fam) 2219 { 2220 struct ifaddr *ifa; 2221 2222 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2223 2224 ifp->if_flags &= ~flag; 2225 getmicrotime(&ifp->if_lastchange); 2226 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2227 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2228 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2229 ifp->if_qflush(ifp); 2230 2231 if (ifp->if_carp) 2232 (*carp_linkstate_p)(ifp); 2233 rt_ifmsg(ifp); 2234 } 2235 2236 /* 2237 * Mark an interface up and notify protocols of 2238 * the transition. 2239 */ 2240 static void 2241 if_route(struct ifnet *ifp, int flag, int fam) 2242 { 2243 struct ifaddr *ifa; 2244 2245 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2246 2247 ifp->if_flags |= flag; 2248 getmicrotime(&ifp->if_lastchange); 2249 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2250 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2251 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2252 if (ifp->if_carp) 2253 (*carp_linkstate_p)(ifp); 2254 rt_ifmsg(ifp); 2255 #ifdef INET6 2256 in6_if_up(ifp); 2257 #endif 2258 } 2259 2260 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2261 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2262 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2263 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2264 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2265 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2266 int (*vlan_setcookie_p)(struct ifnet *, void *); 2267 void *(*vlan_cookie_p)(struct ifnet *); 2268 2269 /* 2270 * Handle a change in the interface link state. To avoid LORs 2271 * between driver lock and upper layer locks, as well as possible 2272 * recursions, we post event to taskqueue, and all job 2273 * is done in static do_link_state_change(). 2274 */ 2275 void 2276 if_link_state_change(struct ifnet *ifp, int link_state) 2277 { 2278 /* Return if state hasn't changed. */ 2279 if (ifp->if_link_state == link_state) 2280 return; 2281 2282 ifp->if_link_state = link_state; 2283 2284 /* XXXGL: reference ifp? */ 2285 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2286 } 2287 2288 static void 2289 do_link_state_change(void *arg, int pending) 2290 { 2291 struct ifnet *ifp; 2292 int link_state; 2293 2294 ifp = arg; 2295 link_state = ifp->if_link_state; 2296 2297 CURVNET_SET(ifp->if_vnet); 2298 rt_ifmsg(ifp); 2299 if (ifp->if_vlantrunk != NULL) 2300 (*vlan_link_state_p)(ifp); 2301 2302 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2303 ifp->if_l2com != NULL) 2304 (*ng_ether_link_state_p)(ifp, link_state); 2305 if (ifp->if_carp) 2306 (*carp_linkstate_p)(ifp); 2307 if (ifp->if_bridge) 2308 ifp->if_bridge_linkstate(ifp); 2309 if (ifp->if_lagg) 2310 (*lagg_linkstate_p)(ifp, link_state); 2311 2312 if (IS_DEFAULT_VNET(curvnet)) 2313 devctl_notify("IFNET", ifp->if_xname, 2314 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2315 NULL); 2316 if (pending > 1) 2317 if_printf(ifp, "%d link states coalesced\n", pending); 2318 if (log_link_state_change) 2319 if_printf(ifp, "link state changed to %s\n", 2320 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2321 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2322 CURVNET_RESTORE(); 2323 } 2324 2325 /* 2326 * Mark an interface down and notify protocols of 2327 * the transition. 2328 */ 2329 void 2330 if_down(struct ifnet *ifp) 2331 { 2332 2333 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2334 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2335 } 2336 2337 /* 2338 * Mark an interface up and notify protocols of 2339 * the transition. 2340 */ 2341 void 2342 if_up(struct ifnet *ifp) 2343 { 2344 2345 if_route(ifp, IFF_UP, AF_UNSPEC); 2346 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2347 } 2348 2349 /* 2350 * Flush an interface queue. 2351 */ 2352 void 2353 if_qflush(struct ifnet *ifp) 2354 { 2355 struct mbuf *m, *n; 2356 struct ifaltq *ifq; 2357 2358 ifq = &ifp->if_snd; 2359 IFQ_LOCK(ifq); 2360 #ifdef ALTQ 2361 if (ALTQ_IS_ENABLED(ifq)) 2362 ALTQ_PURGE(ifq); 2363 #endif 2364 n = ifq->ifq_head; 2365 while ((m = n) != NULL) { 2366 n = m->m_nextpkt; 2367 m_freem(m); 2368 } 2369 ifq->ifq_head = 0; 2370 ifq->ifq_tail = 0; 2371 ifq->ifq_len = 0; 2372 IFQ_UNLOCK(ifq); 2373 } 2374 2375 /* 2376 * Map interface name to interface structure pointer, with or without 2377 * returning a reference. 2378 */ 2379 struct ifnet * 2380 ifunit_ref(const char *name) 2381 { 2382 struct epoch_tracker et; 2383 struct ifnet *ifp; 2384 2385 NET_EPOCH_ENTER(et); 2386 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2387 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2388 !(ifp->if_flags & IFF_DYING)) 2389 break; 2390 } 2391 if (ifp != NULL) 2392 if_ref(ifp); 2393 NET_EPOCH_EXIT(et); 2394 return (ifp); 2395 } 2396 2397 struct ifnet * 2398 ifunit(const char *name) 2399 { 2400 struct epoch_tracker et; 2401 struct ifnet *ifp; 2402 2403 NET_EPOCH_ENTER(et); 2404 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2405 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2406 break; 2407 } 2408 NET_EPOCH_EXIT(et); 2409 return (ifp); 2410 } 2411 2412 static void * 2413 ifr_buffer_get_buffer(void *data) 2414 { 2415 union ifreq_union *ifrup; 2416 2417 ifrup = data; 2418 #ifdef COMPAT_FREEBSD32 2419 if (SV_CURPROC_FLAG(SV_ILP32)) 2420 return ((void *)(uintptr_t) 2421 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2422 #endif 2423 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2424 } 2425 2426 static void 2427 ifr_buffer_set_buffer_null(void *data) 2428 { 2429 union ifreq_union *ifrup; 2430 2431 ifrup = data; 2432 #ifdef COMPAT_FREEBSD32 2433 if (SV_CURPROC_FLAG(SV_ILP32)) 2434 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2435 else 2436 #endif 2437 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2438 } 2439 2440 static size_t 2441 ifr_buffer_get_length(void *data) 2442 { 2443 union ifreq_union *ifrup; 2444 2445 ifrup = data; 2446 #ifdef COMPAT_FREEBSD32 2447 if (SV_CURPROC_FLAG(SV_ILP32)) 2448 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2449 #endif 2450 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2451 } 2452 2453 static void 2454 ifr_buffer_set_length(void *data, size_t len) 2455 { 2456 union ifreq_union *ifrup; 2457 2458 ifrup = data; 2459 #ifdef COMPAT_FREEBSD32 2460 if (SV_CURPROC_FLAG(SV_ILP32)) 2461 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2462 else 2463 #endif 2464 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2465 } 2466 2467 void * 2468 ifr_data_get_ptr(void *ifrp) 2469 { 2470 union ifreq_union *ifrup; 2471 2472 ifrup = ifrp; 2473 #ifdef COMPAT_FREEBSD32 2474 if (SV_CURPROC_FLAG(SV_ILP32)) 2475 return ((void *)(uintptr_t) 2476 ifrup->ifr32.ifr_ifru.ifru_data); 2477 #endif 2478 return (ifrup->ifr.ifr_ifru.ifru_data); 2479 } 2480 2481 /* 2482 * Hardware specific interface ioctls. 2483 */ 2484 int 2485 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2486 { 2487 struct ifreq *ifr; 2488 int error = 0, do_ifup = 0; 2489 int new_flags, temp_flags; 2490 size_t namelen, onamelen; 2491 size_t descrlen; 2492 char *descrbuf, *odescrbuf; 2493 char new_name[IFNAMSIZ]; 2494 struct ifaddr *ifa; 2495 struct sockaddr_dl *sdl; 2496 2497 ifr = (struct ifreq *)data; 2498 switch (cmd) { 2499 case SIOCGIFINDEX: 2500 ifr->ifr_index = ifp->if_index; 2501 break; 2502 2503 case SIOCGIFFLAGS: 2504 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2505 ifr->ifr_flags = temp_flags & 0xffff; 2506 ifr->ifr_flagshigh = temp_flags >> 16; 2507 break; 2508 2509 case SIOCGIFCAP: 2510 ifr->ifr_reqcap = ifp->if_capabilities; 2511 ifr->ifr_curcap = ifp->if_capenable; 2512 break; 2513 2514 #ifdef MAC 2515 case SIOCGIFMAC: 2516 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2517 break; 2518 #endif 2519 2520 case SIOCGIFMETRIC: 2521 ifr->ifr_metric = ifp->if_metric; 2522 break; 2523 2524 case SIOCGIFMTU: 2525 ifr->ifr_mtu = ifp->if_mtu; 2526 break; 2527 2528 case SIOCGIFPHYS: 2529 /* XXXGL: did this ever worked? */ 2530 ifr->ifr_phys = 0; 2531 break; 2532 2533 case SIOCGIFDESCR: 2534 error = 0; 2535 sx_slock(&ifdescr_sx); 2536 if (ifp->if_description == NULL) 2537 error = ENOMSG; 2538 else { 2539 /* space for terminating nul */ 2540 descrlen = strlen(ifp->if_description) + 1; 2541 if (ifr_buffer_get_length(ifr) < descrlen) 2542 ifr_buffer_set_buffer_null(ifr); 2543 else 2544 error = copyout(ifp->if_description, 2545 ifr_buffer_get_buffer(ifr), descrlen); 2546 ifr_buffer_set_length(ifr, descrlen); 2547 } 2548 sx_sunlock(&ifdescr_sx); 2549 break; 2550 2551 case SIOCSIFDESCR: 2552 error = priv_check(td, PRIV_NET_SETIFDESCR); 2553 if (error) 2554 return (error); 2555 2556 /* 2557 * Copy only (length-1) bytes to make sure that 2558 * if_description is always nul terminated. The 2559 * length parameter is supposed to count the 2560 * terminating nul in. 2561 */ 2562 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2563 return (ENAMETOOLONG); 2564 else if (ifr_buffer_get_length(ifr) == 0) 2565 descrbuf = NULL; 2566 else { 2567 descrbuf = malloc(ifr_buffer_get_length(ifr), 2568 M_IFDESCR, M_WAITOK | M_ZERO); 2569 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2570 ifr_buffer_get_length(ifr) - 1); 2571 if (error) { 2572 free(descrbuf, M_IFDESCR); 2573 break; 2574 } 2575 } 2576 2577 sx_xlock(&ifdescr_sx); 2578 odescrbuf = ifp->if_description; 2579 ifp->if_description = descrbuf; 2580 sx_xunlock(&ifdescr_sx); 2581 2582 getmicrotime(&ifp->if_lastchange); 2583 free(odescrbuf, M_IFDESCR); 2584 break; 2585 2586 case SIOCGIFFIB: 2587 ifr->ifr_fib = ifp->if_fib; 2588 break; 2589 2590 case SIOCSIFFIB: 2591 error = priv_check(td, PRIV_NET_SETIFFIB); 2592 if (error) 2593 return (error); 2594 if (ifr->ifr_fib >= rt_numfibs) 2595 return (EINVAL); 2596 2597 ifp->if_fib = ifr->ifr_fib; 2598 break; 2599 2600 case SIOCSIFFLAGS: 2601 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2602 if (error) 2603 return (error); 2604 /* 2605 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2606 * check, so we don't need special handling here yet. 2607 */ 2608 new_flags = (ifr->ifr_flags & 0xffff) | 2609 (ifr->ifr_flagshigh << 16); 2610 if (ifp->if_flags & IFF_UP && 2611 (new_flags & IFF_UP) == 0) { 2612 if_down(ifp); 2613 } else if (new_flags & IFF_UP && 2614 (ifp->if_flags & IFF_UP) == 0) { 2615 do_ifup = 1; 2616 } 2617 /* See if permanently promiscuous mode bit is about to flip */ 2618 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2619 if (new_flags & IFF_PPROMISC) 2620 ifp->if_flags |= IFF_PROMISC; 2621 else if (ifp->if_pcount == 0) 2622 ifp->if_flags &= ~IFF_PROMISC; 2623 if (log_promisc_mode_change) 2624 if_printf(ifp, "permanently promiscuous mode %s\n", 2625 ((new_flags & IFF_PPROMISC) ? 2626 "enabled" : "disabled")); 2627 } 2628 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2629 (new_flags &~ IFF_CANTCHANGE); 2630 if (ifp->if_ioctl) { 2631 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2632 } 2633 if (do_ifup) 2634 if_up(ifp); 2635 getmicrotime(&ifp->if_lastchange); 2636 break; 2637 2638 case SIOCSIFCAP: 2639 error = priv_check(td, PRIV_NET_SETIFCAP); 2640 if (error) 2641 return (error); 2642 if (ifp->if_ioctl == NULL) 2643 return (EOPNOTSUPP); 2644 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2645 return (EINVAL); 2646 error = (*ifp->if_ioctl)(ifp, cmd, data); 2647 if (error == 0) 2648 getmicrotime(&ifp->if_lastchange); 2649 break; 2650 2651 #ifdef MAC 2652 case SIOCSIFMAC: 2653 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2654 break; 2655 #endif 2656 2657 case SIOCSIFNAME: 2658 error = priv_check(td, PRIV_NET_SETIFNAME); 2659 if (error) 2660 return (error); 2661 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2662 NULL); 2663 if (error != 0) 2664 return (error); 2665 if (new_name[0] == '\0') 2666 return (EINVAL); 2667 if (new_name[IFNAMSIZ-1] != '\0') { 2668 new_name[IFNAMSIZ-1] = '\0'; 2669 if (strlen(new_name) == IFNAMSIZ-1) 2670 return (EINVAL); 2671 } 2672 if (strcmp(new_name, ifp->if_xname) == 0) 2673 break; 2674 if (ifunit(new_name) != NULL) 2675 return (EEXIST); 2676 2677 /* 2678 * XXX: Locking. Nothing else seems to lock if_flags, 2679 * and there are numerous other races with the 2680 * ifunit() checks not being atomic with namespace 2681 * changes (renames, vmoves, if_attach, etc). 2682 */ 2683 ifp->if_flags |= IFF_RENAMING; 2684 2685 /* Announce the departure of the interface. */ 2686 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2687 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2688 2689 if_printf(ifp, "changing name to '%s'\n", new_name); 2690 2691 IF_ADDR_WLOCK(ifp); 2692 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2693 ifa = ifp->if_addr; 2694 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2695 namelen = strlen(new_name); 2696 onamelen = sdl->sdl_nlen; 2697 /* 2698 * Move the address if needed. This is safe because we 2699 * allocate space for a name of length IFNAMSIZ when we 2700 * create this in if_attach(). 2701 */ 2702 if (namelen != onamelen) { 2703 bcopy(sdl->sdl_data + onamelen, 2704 sdl->sdl_data + namelen, sdl->sdl_alen); 2705 } 2706 bcopy(new_name, sdl->sdl_data, namelen); 2707 sdl->sdl_nlen = namelen; 2708 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2709 bzero(sdl->sdl_data, onamelen); 2710 while (namelen != 0) 2711 sdl->sdl_data[--namelen] = 0xff; 2712 IF_ADDR_WUNLOCK(ifp); 2713 2714 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2715 /* Announce the return of the interface. */ 2716 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2717 2718 ifp->if_flags &= ~IFF_RENAMING; 2719 break; 2720 2721 #ifdef VIMAGE 2722 case SIOCSIFVNET: 2723 error = priv_check(td, PRIV_NET_SETIFVNET); 2724 if (error) 2725 return (error); 2726 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2727 break; 2728 #endif 2729 2730 case SIOCSIFMETRIC: 2731 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2732 if (error) 2733 return (error); 2734 ifp->if_metric = ifr->ifr_metric; 2735 getmicrotime(&ifp->if_lastchange); 2736 break; 2737 2738 case SIOCSIFPHYS: 2739 error = priv_check(td, PRIV_NET_SETIFPHYS); 2740 if (error) 2741 return (error); 2742 if (ifp->if_ioctl == NULL) 2743 return (EOPNOTSUPP); 2744 error = (*ifp->if_ioctl)(ifp, cmd, data); 2745 if (error == 0) 2746 getmicrotime(&ifp->if_lastchange); 2747 break; 2748 2749 case SIOCSIFMTU: 2750 { 2751 u_long oldmtu = ifp->if_mtu; 2752 2753 error = priv_check(td, PRIV_NET_SETIFMTU); 2754 if (error) 2755 return (error); 2756 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2757 return (EINVAL); 2758 if (ifp->if_ioctl == NULL) 2759 return (EOPNOTSUPP); 2760 error = (*ifp->if_ioctl)(ifp, cmd, data); 2761 if (error == 0) { 2762 getmicrotime(&ifp->if_lastchange); 2763 rt_ifmsg(ifp); 2764 #ifdef INET 2765 DEBUGNET_NOTIFY_MTU(ifp); 2766 #endif 2767 } 2768 /* 2769 * If the link MTU changed, do network layer specific procedure. 2770 */ 2771 if (ifp->if_mtu != oldmtu) { 2772 #ifdef INET6 2773 nd6_setmtu(ifp); 2774 #endif 2775 rt_updatemtu(ifp); 2776 } 2777 break; 2778 } 2779 2780 case SIOCADDMULTI: 2781 case SIOCDELMULTI: 2782 if (cmd == SIOCADDMULTI) 2783 error = priv_check(td, PRIV_NET_ADDMULTI); 2784 else 2785 error = priv_check(td, PRIV_NET_DELMULTI); 2786 if (error) 2787 return (error); 2788 2789 /* Don't allow group membership on non-multicast interfaces. */ 2790 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2791 return (EOPNOTSUPP); 2792 2793 /* Don't let users screw up protocols' entries. */ 2794 if (ifr->ifr_addr.sa_family != AF_LINK) 2795 return (EINVAL); 2796 2797 if (cmd == SIOCADDMULTI) { 2798 struct epoch_tracker et; 2799 struct ifmultiaddr *ifma; 2800 2801 /* 2802 * Userland is only permitted to join groups once 2803 * via the if_addmulti() KPI, because it cannot hold 2804 * struct ifmultiaddr * between calls. It may also 2805 * lose a race while we check if the membership 2806 * already exists. 2807 */ 2808 NET_EPOCH_ENTER(et); 2809 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2810 NET_EPOCH_EXIT(et); 2811 if (ifma != NULL) 2812 error = EADDRINUSE; 2813 else 2814 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2815 } else { 2816 error = if_delmulti(ifp, &ifr->ifr_addr); 2817 } 2818 if (error == 0) 2819 getmicrotime(&ifp->if_lastchange); 2820 break; 2821 2822 case SIOCSIFPHYADDR: 2823 case SIOCDIFPHYADDR: 2824 #ifdef INET6 2825 case SIOCSIFPHYADDR_IN6: 2826 #endif 2827 case SIOCSIFMEDIA: 2828 case SIOCSIFGENERIC: 2829 error = priv_check(td, PRIV_NET_HWIOCTL); 2830 if (error) 2831 return (error); 2832 if (ifp->if_ioctl == NULL) 2833 return (EOPNOTSUPP); 2834 error = (*ifp->if_ioctl)(ifp, cmd, data); 2835 if (error == 0) 2836 getmicrotime(&ifp->if_lastchange); 2837 break; 2838 2839 case SIOCGIFSTATUS: 2840 case SIOCGIFPSRCADDR: 2841 case SIOCGIFPDSTADDR: 2842 case SIOCGIFMEDIA: 2843 case SIOCGIFXMEDIA: 2844 case SIOCGIFGENERIC: 2845 case SIOCGIFRSSKEY: 2846 case SIOCGIFRSSHASH: 2847 case SIOCGIFDOWNREASON: 2848 if (ifp->if_ioctl == NULL) 2849 return (EOPNOTSUPP); 2850 error = (*ifp->if_ioctl)(ifp, cmd, data); 2851 break; 2852 2853 case SIOCSIFLLADDR: 2854 error = priv_check(td, PRIV_NET_SETLLADDR); 2855 if (error) 2856 return (error); 2857 error = if_setlladdr(ifp, 2858 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2859 break; 2860 2861 case SIOCGHWADDR: 2862 error = if_gethwaddr(ifp, ifr); 2863 break; 2864 2865 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2866 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2867 if (error) 2868 return (error); 2869 if ((error = if_addgroup(ifp, 2870 ifgr_group_get((struct ifgroupreq *)data)))) 2871 return (error); 2872 break; 2873 2874 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2875 { 2876 struct epoch_tracker et; 2877 2878 NET_EPOCH_ENTER(et); 2879 error = if_getgroup((struct ifgroupreq *)data, ifp); 2880 NET_EPOCH_EXIT(et); 2881 break; 2882 } 2883 2884 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2885 error = priv_check(td, PRIV_NET_DELIFGROUP); 2886 if (error) 2887 return (error); 2888 if ((error = if_delgroup(ifp, 2889 ifgr_group_get((struct ifgroupreq *)data)))) 2890 return (error); 2891 break; 2892 2893 default: 2894 error = ENOIOCTL; 2895 break; 2896 } 2897 return (error); 2898 } 2899 2900 #ifdef COMPAT_FREEBSD32 2901 struct ifconf32 { 2902 int32_t ifc_len; 2903 union { 2904 uint32_t ifcu_buf; 2905 uint32_t ifcu_req; 2906 } ifc_ifcu; 2907 }; 2908 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2909 #endif 2910 2911 #ifdef COMPAT_FREEBSD32 2912 static void 2913 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2914 { 2915 struct ifmediareq32 *ifmr32; 2916 2917 ifmr32 = (struct ifmediareq32 *)data; 2918 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2919 sizeof(ifmr->ifm_name)); 2920 ifmr->ifm_current = ifmr32->ifm_current; 2921 ifmr->ifm_mask = ifmr32->ifm_mask; 2922 ifmr->ifm_status = ifmr32->ifm_status; 2923 ifmr->ifm_active = ifmr32->ifm_active; 2924 ifmr->ifm_count = ifmr32->ifm_count; 2925 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2926 } 2927 2928 static void 2929 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2930 { 2931 struct ifmediareq32 *ifmr32; 2932 2933 ifmr32 = (struct ifmediareq32 *)data; 2934 ifmr32->ifm_current = ifmr->ifm_current; 2935 ifmr32->ifm_mask = ifmr->ifm_mask; 2936 ifmr32->ifm_status = ifmr->ifm_status; 2937 ifmr32->ifm_active = ifmr->ifm_active; 2938 ifmr32->ifm_count = ifmr->ifm_count; 2939 } 2940 #endif 2941 2942 /* 2943 * Interface ioctls. 2944 */ 2945 int 2946 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2947 { 2948 #ifdef COMPAT_FREEBSD32 2949 caddr_t saved_data = NULL; 2950 struct ifmediareq ifmr; 2951 struct ifmediareq *ifmrp = NULL; 2952 #endif 2953 struct ifnet *ifp; 2954 struct ifreq *ifr; 2955 int error; 2956 int oif_flags; 2957 2958 CURVNET_SET(so->so_vnet); 2959 #ifdef VIMAGE 2960 /* Make sure the VNET is stable. */ 2961 if (so->so_vnet->vnet_shutdown) { 2962 CURVNET_RESTORE(); 2963 return (EBUSY); 2964 } 2965 #endif 2966 2967 switch (cmd) { 2968 case SIOCGIFCONF: 2969 error = ifconf(cmd, data); 2970 goto out_noref; 2971 2972 #ifdef COMPAT_FREEBSD32 2973 case SIOCGIFCONF32: 2974 { 2975 struct ifconf32 *ifc32; 2976 struct ifconf ifc; 2977 2978 ifc32 = (struct ifconf32 *)data; 2979 ifc.ifc_len = ifc32->ifc_len; 2980 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2981 2982 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2983 if (error == 0) 2984 ifc32->ifc_len = ifc.ifc_len; 2985 goto out_noref; 2986 } 2987 #endif 2988 } 2989 2990 #ifdef COMPAT_FREEBSD32 2991 switch (cmd) { 2992 case SIOCGIFMEDIA32: 2993 case SIOCGIFXMEDIA32: 2994 ifmrp = &ifmr; 2995 ifmr_init(ifmrp, data); 2996 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 2997 saved_data = data; 2998 data = (caddr_t)ifmrp; 2999 } 3000 #endif 3001 3002 ifr = (struct ifreq *)data; 3003 switch (cmd) { 3004 #ifdef VIMAGE 3005 case SIOCSIFRVNET: 3006 error = priv_check(td, PRIV_NET_SETIFVNET); 3007 if (error == 0) 3008 error = if_vmove_reclaim(td, ifr->ifr_name, 3009 ifr->ifr_jid); 3010 goto out_noref; 3011 #endif 3012 case SIOCIFCREATE: 3013 case SIOCIFCREATE2: 3014 error = priv_check(td, PRIV_NET_IFCREATE); 3015 if (error == 0) 3016 error = if_clone_create(ifr->ifr_name, 3017 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3018 ifr_data_get_ptr(ifr) : NULL); 3019 goto out_noref; 3020 case SIOCIFDESTROY: 3021 error = priv_check(td, PRIV_NET_IFDESTROY); 3022 if (error == 0) 3023 error = if_clone_destroy(ifr->ifr_name); 3024 goto out_noref; 3025 3026 case SIOCIFGCLONERS: 3027 error = if_clone_list((struct if_clonereq *)data); 3028 goto out_noref; 3029 3030 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3031 error = if_getgroupmembers((struct ifgroupreq *)data); 3032 goto out_noref; 3033 3034 #if defined(INET) || defined(INET6) 3035 case SIOCSVH: 3036 case SIOCGVH: 3037 if (carp_ioctl_p == NULL) 3038 error = EPROTONOSUPPORT; 3039 else 3040 error = (*carp_ioctl_p)(ifr, cmd, td); 3041 goto out_noref; 3042 #endif 3043 } 3044 3045 ifp = ifunit_ref(ifr->ifr_name); 3046 if (ifp == NULL) { 3047 error = ENXIO; 3048 goto out_noref; 3049 } 3050 3051 error = ifhwioctl(cmd, ifp, data, td); 3052 if (error != ENOIOCTL) 3053 goto out_ref; 3054 3055 oif_flags = ifp->if_flags; 3056 if (so->so_proto == NULL) { 3057 error = EOPNOTSUPP; 3058 goto out_ref; 3059 } 3060 3061 /* 3062 * Pass the request on to the socket control method, and if the 3063 * latter returns EOPNOTSUPP, directly to the interface. 3064 * 3065 * Make an exception for the legacy SIOCSIF* requests. Drivers 3066 * trust SIOCSIFADDR et al to come from an already privileged 3067 * layer, and do not perform any credentials checks or input 3068 * validation. 3069 */ 3070 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3071 ifp, td)); 3072 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3073 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3074 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3075 error = (*ifp->if_ioctl)(ifp, cmd, data); 3076 3077 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3078 #ifdef INET6 3079 if (ifp->if_flags & IFF_UP) 3080 in6_if_up(ifp); 3081 #endif 3082 } 3083 3084 out_ref: 3085 if_rele(ifp); 3086 out_noref: 3087 #ifdef COMPAT_FREEBSD32 3088 if (ifmrp != NULL) { 3089 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3090 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3091 cmd)); 3092 data = saved_data; 3093 ifmr_update(ifmrp, data); 3094 } 3095 #endif 3096 CURVNET_RESTORE(); 3097 return (error); 3098 } 3099 3100 /* 3101 * The code common to handling reference counted flags, 3102 * e.g., in ifpromisc() and if_allmulti(). 3103 * The "pflag" argument can specify a permanent mode flag to check, 3104 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3105 * 3106 * Only to be used on stack-owned flags, not driver-owned flags. 3107 */ 3108 static int 3109 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3110 { 3111 struct ifreq ifr; 3112 int error; 3113 int oldflags, oldcount; 3114 3115 /* Sanity checks to catch programming errors */ 3116 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3117 ("%s: setting driver-owned flag %d", __func__, flag)); 3118 3119 if (onswitch) 3120 KASSERT(*refcount >= 0, 3121 ("%s: increment negative refcount %d for flag %d", 3122 __func__, *refcount, flag)); 3123 else 3124 KASSERT(*refcount > 0, 3125 ("%s: decrement non-positive refcount %d for flag %d", 3126 __func__, *refcount, flag)); 3127 3128 /* In case this mode is permanent, just touch refcount */ 3129 if (ifp->if_flags & pflag) { 3130 *refcount += onswitch ? 1 : -1; 3131 return (0); 3132 } 3133 3134 /* Save ifnet parameters for if_ioctl() may fail */ 3135 oldcount = *refcount; 3136 oldflags = ifp->if_flags; 3137 3138 /* 3139 * See if we aren't the only and touching refcount is enough. 3140 * Actually toggle interface flag if we are the first or last. 3141 */ 3142 if (onswitch) { 3143 if ((*refcount)++) 3144 return (0); 3145 ifp->if_flags |= flag; 3146 } else { 3147 if (--(*refcount)) 3148 return (0); 3149 ifp->if_flags &= ~flag; 3150 } 3151 3152 /* Call down the driver since we've changed interface flags */ 3153 if (ifp->if_ioctl == NULL) { 3154 error = EOPNOTSUPP; 3155 goto recover; 3156 } 3157 ifr.ifr_flags = ifp->if_flags & 0xffff; 3158 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3159 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3160 if (error) 3161 goto recover; 3162 /* Notify userland that interface flags have changed */ 3163 rt_ifmsg(ifp); 3164 return (0); 3165 3166 recover: 3167 /* Recover after driver error */ 3168 *refcount = oldcount; 3169 ifp->if_flags = oldflags; 3170 return (error); 3171 } 3172 3173 /* 3174 * Set/clear promiscuous mode on interface ifp based on the truth value 3175 * of pswitch. The calls are reference counted so that only the first 3176 * "on" request actually has an effect, as does the final "off" request. 3177 * Results are undefined if the "off" and "on" requests are not matched. 3178 */ 3179 int 3180 ifpromisc(struct ifnet *ifp, int pswitch) 3181 { 3182 int error; 3183 int oldflags = ifp->if_flags; 3184 3185 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3186 &ifp->if_pcount, pswitch); 3187 /* If promiscuous mode status has changed, log a message */ 3188 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3189 log_promisc_mode_change) 3190 if_printf(ifp, "promiscuous mode %s\n", 3191 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3192 return (error); 3193 } 3194 3195 /* 3196 * Return interface configuration 3197 * of system. List may be used 3198 * in later ioctl's (above) to get 3199 * other information. 3200 */ 3201 /*ARGSUSED*/ 3202 static int 3203 ifconf(u_long cmd, caddr_t data) 3204 { 3205 struct ifconf *ifc = (struct ifconf *)data; 3206 struct ifnet *ifp; 3207 struct ifaddr *ifa; 3208 struct ifreq ifr; 3209 struct sbuf *sb; 3210 int error, full = 0, valid_len, max_len; 3211 3212 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3213 max_len = MAXPHYS - 1; 3214 3215 /* Prevent hostile input from being able to crash the system */ 3216 if (ifc->ifc_len <= 0) 3217 return (EINVAL); 3218 3219 again: 3220 if (ifc->ifc_len <= max_len) { 3221 max_len = ifc->ifc_len; 3222 full = 1; 3223 } 3224 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3225 max_len = 0; 3226 valid_len = 0; 3227 3228 IFNET_RLOCK(); 3229 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3230 struct epoch_tracker et; 3231 int addrs; 3232 3233 /* 3234 * Zero the ifr to make sure we don't disclose the contents 3235 * of the stack. 3236 */ 3237 memset(&ifr, 0, sizeof(ifr)); 3238 3239 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3240 >= sizeof(ifr.ifr_name)) { 3241 sbuf_delete(sb); 3242 IFNET_RUNLOCK(); 3243 return (ENAMETOOLONG); 3244 } 3245 3246 addrs = 0; 3247 NET_EPOCH_ENTER(et); 3248 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3249 struct sockaddr *sa = ifa->ifa_addr; 3250 3251 if (prison_if(curthread->td_ucred, sa) != 0) 3252 continue; 3253 addrs++; 3254 if (sa->sa_len <= sizeof(*sa)) { 3255 if (sa->sa_len < sizeof(*sa)) { 3256 memset(&ifr.ifr_ifru.ifru_addr, 0, 3257 sizeof(ifr.ifr_ifru.ifru_addr)); 3258 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3259 sa->sa_len); 3260 } else 3261 ifr.ifr_ifru.ifru_addr = *sa; 3262 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3263 max_len += sizeof(ifr); 3264 } else { 3265 sbuf_bcat(sb, &ifr, 3266 offsetof(struct ifreq, ifr_addr)); 3267 max_len += offsetof(struct ifreq, ifr_addr); 3268 sbuf_bcat(sb, sa, sa->sa_len); 3269 max_len += sa->sa_len; 3270 } 3271 3272 if (sbuf_error(sb) == 0) 3273 valid_len = sbuf_len(sb); 3274 } 3275 NET_EPOCH_EXIT(et); 3276 if (addrs == 0) { 3277 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3278 max_len += sizeof(ifr); 3279 3280 if (sbuf_error(sb) == 0) 3281 valid_len = sbuf_len(sb); 3282 } 3283 } 3284 IFNET_RUNLOCK(); 3285 3286 /* 3287 * If we didn't allocate enough space (uncommon), try again. If 3288 * we have already allocated as much space as we are allowed, 3289 * return what we've got. 3290 */ 3291 if (valid_len != max_len && !full) { 3292 sbuf_delete(sb); 3293 goto again; 3294 } 3295 3296 ifc->ifc_len = valid_len; 3297 sbuf_finish(sb); 3298 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3299 sbuf_delete(sb); 3300 return (error); 3301 } 3302 3303 /* 3304 * Just like ifpromisc(), but for all-multicast-reception mode. 3305 */ 3306 int 3307 if_allmulti(struct ifnet *ifp, int onswitch) 3308 { 3309 3310 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3311 } 3312 3313 struct ifmultiaddr * 3314 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3315 { 3316 struct ifmultiaddr *ifma; 3317 3318 IF_ADDR_LOCK_ASSERT(ifp); 3319 3320 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3321 if (sa->sa_family == AF_LINK) { 3322 if (sa_dl_equal(ifma->ifma_addr, sa)) 3323 break; 3324 } else { 3325 if (sa_equal(ifma->ifma_addr, sa)) 3326 break; 3327 } 3328 } 3329 3330 return ifma; 3331 } 3332 3333 /* 3334 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3335 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3336 * the ifnet multicast address list here, so the caller must do that and 3337 * other setup work (such as notifying the device driver). The reference 3338 * count is initialized to 1. 3339 */ 3340 static struct ifmultiaddr * 3341 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3342 int mflags) 3343 { 3344 struct ifmultiaddr *ifma; 3345 struct sockaddr *dupsa; 3346 3347 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3348 M_ZERO); 3349 if (ifma == NULL) 3350 return (NULL); 3351 3352 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3353 if (dupsa == NULL) { 3354 free(ifma, M_IFMADDR); 3355 return (NULL); 3356 } 3357 bcopy(sa, dupsa, sa->sa_len); 3358 ifma->ifma_addr = dupsa; 3359 3360 ifma->ifma_ifp = ifp; 3361 ifma->ifma_refcount = 1; 3362 ifma->ifma_protospec = NULL; 3363 3364 if (llsa == NULL) { 3365 ifma->ifma_lladdr = NULL; 3366 return (ifma); 3367 } 3368 3369 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3370 if (dupsa == NULL) { 3371 free(ifma->ifma_addr, M_IFMADDR); 3372 free(ifma, M_IFMADDR); 3373 return (NULL); 3374 } 3375 bcopy(llsa, dupsa, llsa->sa_len); 3376 ifma->ifma_lladdr = dupsa; 3377 3378 return (ifma); 3379 } 3380 3381 /* 3382 * if_freemulti: free ifmultiaddr structure and possibly attached related 3383 * addresses. The caller is responsible for implementing reference 3384 * counting, notifying the driver, handling routing messages, and releasing 3385 * any dependent link layer state. 3386 */ 3387 #ifdef MCAST_VERBOSE 3388 extern void kdb_backtrace(void); 3389 #endif 3390 static void 3391 if_freemulti_internal(struct ifmultiaddr *ifma) 3392 { 3393 3394 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3395 ifma->ifma_refcount)); 3396 3397 if (ifma->ifma_lladdr != NULL) 3398 free(ifma->ifma_lladdr, M_IFMADDR); 3399 #ifdef MCAST_VERBOSE 3400 kdb_backtrace(); 3401 printf("%s freeing ifma: %p\n", __func__, ifma); 3402 #endif 3403 free(ifma->ifma_addr, M_IFMADDR); 3404 free(ifma, M_IFMADDR); 3405 } 3406 3407 static void 3408 if_destroymulti(epoch_context_t ctx) 3409 { 3410 struct ifmultiaddr *ifma; 3411 3412 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3413 if_freemulti_internal(ifma); 3414 } 3415 3416 void 3417 if_freemulti(struct ifmultiaddr *ifma) 3418 { 3419 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3420 ifma->ifma_refcount)); 3421 3422 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3423 } 3424 3425 3426 /* 3427 * Register an additional multicast address with a network interface. 3428 * 3429 * - If the address is already present, bump the reference count on the 3430 * address and return. 3431 * - If the address is not link-layer, look up a link layer address. 3432 * - Allocate address structures for one or both addresses, and attach to the 3433 * multicast address list on the interface. If automatically adding a link 3434 * layer address, the protocol address will own a reference to the link 3435 * layer address, to be freed when it is freed. 3436 * - Notify the network device driver of an addition to the multicast address 3437 * list. 3438 * 3439 * 'sa' points to caller-owned memory with the desired multicast address. 3440 * 3441 * 'retifma' will be used to return a pointer to the resulting multicast 3442 * address reference, if desired. 3443 */ 3444 int 3445 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3446 struct ifmultiaddr **retifma) 3447 { 3448 struct ifmultiaddr *ifma, *ll_ifma; 3449 struct sockaddr *llsa; 3450 struct sockaddr_dl sdl; 3451 int error; 3452 3453 #ifdef INET 3454 IN_MULTI_LIST_UNLOCK_ASSERT(); 3455 #endif 3456 #ifdef INET6 3457 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3458 #endif 3459 /* 3460 * If the address is already present, return a new reference to it; 3461 * otherwise, allocate storage and set up a new address. 3462 */ 3463 IF_ADDR_WLOCK(ifp); 3464 ifma = if_findmulti(ifp, sa); 3465 if (ifma != NULL) { 3466 ifma->ifma_refcount++; 3467 if (retifma != NULL) 3468 *retifma = ifma; 3469 IF_ADDR_WUNLOCK(ifp); 3470 return (0); 3471 } 3472 3473 /* 3474 * The address isn't already present; resolve the protocol address 3475 * into a link layer address, and then look that up, bump its 3476 * refcount or allocate an ifma for that also. 3477 * Most link layer resolving functions returns address data which 3478 * fits inside default sockaddr_dl structure. However callback 3479 * can allocate another sockaddr structure, in that case we need to 3480 * free it later. 3481 */ 3482 llsa = NULL; 3483 ll_ifma = NULL; 3484 if (ifp->if_resolvemulti != NULL) { 3485 /* Provide called function with buffer size information */ 3486 sdl.sdl_len = sizeof(sdl); 3487 llsa = (struct sockaddr *)&sdl; 3488 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3489 if (error) 3490 goto unlock_out; 3491 } 3492 3493 /* 3494 * Allocate the new address. Don't hook it up yet, as we may also 3495 * need to allocate a link layer multicast address. 3496 */ 3497 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3498 if (ifma == NULL) { 3499 error = ENOMEM; 3500 goto free_llsa_out; 3501 } 3502 3503 /* 3504 * If a link layer address is found, we'll need to see if it's 3505 * already present in the address list, or allocate is as well. 3506 * When this block finishes, the link layer address will be on the 3507 * list. 3508 */ 3509 if (llsa != NULL) { 3510 ll_ifma = if_findmulti(ifp, llsa); 3511 if (ll_ifma == NULL) { 3512 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3513 if (ll_ifma == NULL) { 3514 --ifma->ifma_refcount; 3515 if_freemulti(ifma); 3516 error = ENOMEM; 3517 goto free_llsa_out; 3518 } 3519 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3520 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3521 ifma_link); 3522 } else 3523 ll_ifma->ifma_refcount++; 3524 ifma->ifma_llifma = ll_ifma; 3525 } 3526 3527 /* 3528 * We now have a new multicast address, ifma, and possibly a new or 3529 * referenced link layer address. Add the primary address to the 3530 * ifnet address list. 3531 */ 3532 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3533 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3534 3535 if (retifma != NULL) 3536 *retifma = ifma; 3537 3538 /* 3539 * Must generate the message while holding the lock so that 'ifma' 3540 * pointer is still valid. 3541 */ 3542 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3543 IF_ADDR_WUNLOCK(ifp); 3544 3545 /* 3546 * We are certain we have added something, so call down to the 3547 * interface to let them know about it. 3548 */ 3549 if (ifp->if_ioctl != NULL) { 3550 if (THREAD_CAN_SLEEP()) 3551 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3552 else 3553 taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask); 3554 } 3555 3556 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3557 link_free_sdl(llsa); 3558 3559 return (0); 3560 3561 free_llsa_out: 3562 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3563 link_free_sdl(llsa); 3564 3565 unlock_out: 3566 IF_ADDR_WUNLOCK(ifp); 3567 return (error); 3568 } 3569 3570 static void 3571 if_siocaddmulti(void *arg, int pending) 3572 { 3573 struct ifnet *ifp; 3574 3575 ifp = arg; 3576 #ifdef DIAGNOSTIC 3577 if (pending > 1) 3578 if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending); 3579 #endif 3580 CURVNET_SET(ifp->if_vnet); 3581 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3582 CURVNET_RESTORE(); 3583 } 3584 3585 /* 3586 * Delete a multicast group membership by network-layer group address. 3587 * 3588 * Returns ENOENT if the entry could not be found. If ifp no longer 3589 * exists, results are undefined. This entry point should only be used 3590 * from subsystems which do appropriate locking to hold ifp for the 3591 * duration of the call. 3592 * Network-layer protocol domains must use if_delmulti_ifma(). 3593 */ 3594 int 3595 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3596 { 3597 struct ifmultiaddr *ifma; 3598 int lastref; 3599 3600 KASSERT(ifp, ("%s: NULL ifp", __func__)); 3601 3602 IF_ADDR_WLOCK(ifp); 3603 lastref = 0; 3604 ifma = if_findmulti(ifp, sa); 3605 if (ifma != NULL) 3606 lastref = if_delmulti_locked(ifp, ifma, 0); 3607 IF_ADDR_WUNLOCK(ifp); 3608 3609 if (ifma == NULL) 3610 return (ENOENT); 3611 3612 if (lastref && ifp->if_ioctl != NULL) { 3613 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3614 } 3615 3616 return (0); 3617 } 3618 3619 /* 3620 * Delete all multicast group membership for an interface. 3621 * Should be used to quickly flush all multicast filters. 3622 */ 3623 void 3624 if_delallmulti(struct ifnet *ifp) 3625 { 3626 struct ifmultiaddr *ifma; 3627 struct ifmultiaddr *next; 3628 3629 IF_ADDR_WLOCK(ifp); 3630 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3631 if_delmulti_locked(ifp, ifma, 0); 3632 IF_ADDR_WUNLOCK(ifp); 3633 } 3634 3635 void 3636 if_delmulti_ifma(struct ifmultiaddr *ifma) 3637 { 3638 if_delmulti_ifma_flags(ifma, 0); 3639 } 3640 3641 /* 3642 * Delete a multicast group membership by group membership pointer. 3643 * Network-layer protocol domains must use this routine. 3644 * 3645 * It is safe to call this routine if the ifp disappeared. 3646 */ 3647 void 3648 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3649 { 3650 struct ifnet *ifp; 3651 int lastref; 3652 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3653 #ifdef INET 3654 IN_MULTI_LIST_UNLOCK_ASSERT(); 3655 #endif 3656 ifp = ifma->ifma_ifp; 3657 #ifdef DIAGNOSTIC 3658 if (ifp == NULL) { 3659 printf("%s: ifma_ifp seems to be detached\n", __func__); 3660 } else { 3661 struct epoch_tracker et; 3662 struct ifnet *oifp; 3663 3664 NET_EPOCH_ENTER(et); 3665 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3666 if (ifp == oifp) 3667 break; 3668 NET_EPOCH_EXIT(et); 3669 if (ifp != oifp) 3670 ifp = NULL; 3671 } 3672 #endif 3673 /* 3674 * If and only if the ifnet instance exists: Acquire the address lock. 3675 */ 3676 if (ifp != NULL) 3677 IF_ADDR_WLOCK(ifp); 3678 3679 lastref = if_delmulti_locked(ifp, ifma, flags); 3680 3681 if (ifp != NULL) { 3682 /* 3683 * If and only if the ifnet instance exists: 3684 * Release the address lock. 3685 * If the group was left: update the hardware hash filter. 3686 */ 3687 IF_ADDR_WUNLOCK(ifp); 3688 if (lastref && ifp->if_ioctl != NULL) { 3689 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3690 } 3691 } 3692 } 3693 3694 /* 3695 * Perform deletion of network-layer and/or link-layer multicast address. 3696 * 3697 * Return 0 if the reference count was decremented. 3698 * Return 1 if the final reference was released, indicating that the 3699 * hardware hash filter should be reprogrammed. 3700 */ 3701 static int 3702 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3703 { 3704 struct ifmultiaddr *ll_ifma; 3705 3706 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3707 KASSERT(ifma->ifma_ifp == ifp, 3708 ("%s: inconsistent ifp %p", __func__, ifp)); 3709 IF_ADDR_WLOCK_ASSERT(ifp); 3710 } 3711 3712 ifp = ifma->ifma_ifp; 3713 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3714 3715 /* 3716 * If the ifnet is detaching, null out references to ifnet, 3717 * so that upper protocol layers will notice, and not attempt 3718 * to obtain locks for an ifnet which no longer exists. The 3719 * routing socket announcement must happen before the ifnet 3720 * instance is detached from the system. 3721 */ 3722 if (detaching) { 3723 #ifdef DIAGNOSTIC 3724 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3725 #endif 3726 /* 3727 * ifp may already be nulled out if we are being reentered 3728 * to delete the ll_ifma. 3729 */ 3730 if (ifp != NULL) { 3731 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3732 ifma->ifma_ifp = NULL; 3733 } 3734 } 3735 3736 if (--ifma->ifma_refcount > 0) 3737 return 0; 3738 3739 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3740 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3741 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3742 } 3743 /* 3744 * If this ifma is a network-layer ifma, a link-layer ifma may 3745 * have been associated with it. Release it first if so. 3746 */ 3747 ll_ifma = ifma->ifma_llifma; 3748 if (ll_ifma != NULL) { 3749 KASSERT(ifma->ifma_lladdr != NULL, 3750 ("%s: llifma w/o lladdr", __func__)); 3751 if (detaching) 3752 ll_ifma->ifma_ifp = NULL; /* XXX */ 3753 if (--ll_ifma->ifma_refcount == 0) { 3754 if (ifp != NULL) { 3755 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3756 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3757 ifma_link); 3758 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3759 } 3760 } 3761 if_freemulti(ll_ifma); 3762 } 3763 } 3764 #ifdef INVARIANTS 3765 if (ifp) { 3766 struct ifmultiaddr *ifmatmp; 3767 3768 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3769 MPASS(ifma != ifmatmp); 3770 } 3771 #endif 3772 if_freemulti(ifma); 3773 /* 3774 * The last reference to this instance of struct ifmultiaddr 3775 * was released; the hardware should be notified of this change. 3776 */ 3777 return 1; 3778 } 3779 3780 /* 3781 * Set the link layer address on an interface. 3782 * 3783 * At this time we only support certain types of interfaces, 3784 * and we don't allow the length of the address to change. 3785 * 3786 * Set noinline to be dtrace-friendly 3787 */ 3788 __noinline int 3789 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3790 { 3791 struct sockaddr_dl *sdl; 3792 struct ifaddr *ifa; 3793 struct ifreq ifr; 3794 3795 ifa = ifp->if_addr; 3796 if (ifa == NULL) 3797 return (EINVAL); 3798 3799 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3800 if (sdl == NULL) 3801 return (EINVAL); 3802 3803 if (len != sdl->sdl_alen) /* don't allow length to change */ 3804 return (EINVAL); 3805 3806 switch (ifp->if_type) { 3807 case IFT_ETHER: 3808 case IFT_XETHER: 3809 case IFT_L2VLAN: 3810 case IFT_BRIDGE: 3811 case IFT_IEEE8023ADLAG: 3812 bcopy(lladdr, LLADDR(sdl), len); 3813 break; 3814 default: 3815 return (ENODEV); 3816 } 3817 3818 /* 3819 * If the interface is already up, we need 3820 * to re-init it in order to reprogram its 3821 * address filter. 3822 */ 3823 if ((ifp->if_flags & IFF_UP) != 0) { 3824 if (ifp->if_ioctl) { 3825 ifp->if_flags &= ~IFF_UP; 3826 ifr.ifr_flags = ifp->if_flags & 0xffff; 3827 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3828 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3829 ifp->if_flags |= IFF_UP; 3830 ifr.ifr_flags = ifp->if_flags & 0xffff; 3831 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3832 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3833 } 3834 } 3835 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3836 3837 return (0); 3838 } 3839 3840 /* 3841 * Compat function for handling basic encapsulation requests. 3842 * Not converted stacks (FDDI, IB, ..) supports traditional 3843 * output model: ARP (and other similar L2 protocols) are handled 3844 * inside output routine, arpresolve/nd6_resolve() returns MAC 3845 * address instead of full prepend. 3846 * 3847 * This function creates calculated header==MAC for IPv4/IPv6 and 3848 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3849 * address families. 3850 */ 3851 static int 3852 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3853 { 3854 3855 if (req->rtype != IFENCAP_LL) 3856 return (EOPNOTSUPP); 3857 3858 if (req->bufsize < req->lladdr_len) 3859 return (ENOMEM); 3860 3861 switch (req->family) { 3862 case AF_INET: 3863 case AF_INET6: 3864 break; 3865 default: 3866 return (EAFNOSUPPORT); 3867 } 3868 3869 /* Copy lladdr to storage as is */ 3870 memmove(req->buf, req->lladdr, req->lladdr_len); 3871 req->bufsize = req->lladdr_len; 3872 req->lladdr_off = 0; 3873 3874 return (0); 3875 } 3876 3877 /* 3878 * Tunnel interfaces can nest, also they may cause infinite recursion 3879 * calls when misconfigured. We'll prevent this by detecting loops. 3880 * High nesting level may cause stack exhaustion. We'll prevent this 3881 * by introducing upper limit. 3882 * 3883 * Return 0, if tunnel nesting count is equal or less than limit. 3884 */ 3885 int 3886 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3887 int limit) 3888 { 3889 struct m_tag *mtag; 3890 int count; 3891 3892 count = 1; 3893 mtag = NULL; 3894 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3895 if (*(struct ifnet **)(mtag + 1) == ifp) { 3896 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3897 return (EIO); 3898 } 3899 count++; 3900 } 3901 if (count > limit) { 3902 log(LOG_NOTICE, 3903 "%s: if_output recursively called too many times(%d)\n", 3904 if_name(ifp), count); 3905 return (EIO); 3906 } 3907 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3908 if (mtag == NULL) 3909 return (ENOMEM); 3910 *(struct ifnet **)(mtag + 1) = ifp; 3911 m_tag_prepend(m, mtag); 3912 return (0); 3913 } 3914 3915 /* 3916 * Get the link layer address that was read from the hardware at attach. 3917 * 3918 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3919 * their component interfaces as IFT_IEEE8023ADLAG. 3920 */ 3921 int 3922 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3923 { 3924 3925 if (ifp->if_hw_addr == NULL) 3926 return (ENODEV); 3927 3928 switch (ifp->if_type) { 3929 case IFT_ETHER: 3930 case IFT_IEEE8023ADLAG: 3931 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3932 return (0); 3933 default: 3934 return (ENODEV); 3935 } 3936 } 3937 3938 /* 3939 * The name argument must be a pointer to storage which will last as 3940 * long as the interface does. For physical devices, the result of 3941 * device_get_name(dev) is a good choice and for pseudo-devices a 3942 * static string works well. 3943 */ 3944 void 3945 if_initname(struct ifnet *ifp, const char *name, int unit) 3946 { 3947 ifp->if_dname = name; 3948 ifp->if_dunit = unit; 3949 if (unit != IF_DUNIT_NONE) 3950 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3951 else 3952 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3953 } 3954 3955 int 3956 if_printf(struct ifnet *ifp, const char *fmt, ...) 3957 { 3958 char if_fmt[256]; 3959 va_list ap; 3960 3961 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3962 va_start(ap, fmt); 3963 vlog(LOG_INFO, if_fmt, ap); 3964 va_end(ap); 3965 return (0); 3966 } 3967 3968 void 3969 if_start(struct ifnet *ifp) 3970 { 3971 3972 (*(ifp)->if_start)(ifp); 3973 } 3974 3975 /* 3976 * Backwards compatibility interface for drivers 3977 * that have not implemented it 3978 */ 3979 static int 3980 if_transmit(struct ifnet *ifp, struct mbuf *m) 3981 { 3982 int error; 3983 3984 IFQ_HANDOFF(ifp, m, error); 3985 return (error); 3986 } 3987 3988 static void 3989 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 3990 { 3991 3992 m_freem(m); 3993 } 3994 3995 int 3996 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3997 { 3998 int active = 0; 3999 4000 IF_LOCK(ifq); 4001 if (_IF_QFULL(ifq)) { 4002 IF_UNLOCK(ifq); 4003 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4004 m_freem(m); 4005 return (0); 4006 } 4007 if (ifp != NULL) { 4008 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4009 if (m->m_flags & (M_BCAST|M_MCAST)) 4010 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4011 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4012 } 4013 _IF_ENQUEUE(ifq, m); 4014 IF_UNLOCK(ifq); 4015 if (ifp != NULL && !active) 4016 (*(ifp)->if_start)(ifp); 4017 return (1); 4018 } 4019 4020 void 4021 if_register_com_alloc(u_char type, 4022 if_com_alloc_t *a, if_com_free_t *f) 4023 { 4024 4025 KASSERT(if_com_alloc[type] == NULL, 4026 ("if_register_com_alloc: %d already registered", type)); 4027 KASSERT(if_com_free[type] == NULL, 4028 ("if_register_com_alloc: %d free already registered", type)); 4029 4030 if_com_alloc[type] = a; 4031 if_com_free[type] = f; 4032 } 4033 4034 void 4035 if_deregister_com_alloc(u_char type) 4036 { 4037 4038 KASSERT(if_com_alloc[type] != NULL, 4039 ("if_deregister_com_alloc: %d not registered", type)); 4040 KASSERT(if_com_free[type] != NULL, 4041 ("if_deregister_com_alloc: %d free not registered", type)); 4042 if_com_alloc[type] = NULL; 4043 if_com_free[type] = NULL; 4044 } 4045 4046 /* API for driver access to network stack owned ifnet.*/ 4047 uint64_t 4048 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4049 { 4050 uint64_t oldbrate; 4051 4052 oldbrate = ifp->if_baudrate; 4053 ifp->if_baudrate = baudrate; 4054 return (oldbrate); 4055 } 4056 4057 uint64_t 4058 if_getbaudrate(if_t ifp) 4059 { 4060 4061 return (((struct ifnet *)ifp)->if_baudrate); 4062 } 4063 4064 int 4065 if_setcapabilities(if_t ifp, int capabilities) 4066 { 4067 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4068 return (0); 4069 } 4070 4071 int 4072 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4073 { 4074 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4075 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4076 4077 return (0); 4078 } 4079 4080 int 4081 if_getcapabilities(if_t ifp) 4082 { 4083 return ((struct ifnet *)ifp)->if_capabilities; 4084 } 4085 4086 int 4087 if_setcapenable(if_t ifp, int capabilities) 4088 { 4089 ((struct ifnet *)ifp)->if_capenable = capabilities; 4090 return (0); 4091 } 4092 4093 int 4094 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4095 { 4096 if(setcap) 4097 ((struct ifnet *)ifp)->if_capenable |= setcap; 4098 if(clearcap) 4099 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4100 4101 return (0); 4102 } 4103 4104 const char * 4105 if_getdname(if_t ifp) 4106 { 4107 return ((struct ifnet *)ifp)->if_dname; 4108 } 4109 4110 int 4111 if_togglecapenable(if_t ifp, int togglecap) 4112 { 4113 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4114 return (0); 4115 } 4116 4117 int 4118 if_getcapenable(if_t ifp) 4119 { 4120 return ((struct ifnet *)ifp)->if_capenable; 4121 } 4122 4123 /* 4124 * This is largely undesirable because it ties ifnet to a device, but does 4125 * provide flexiblity for an embedded product vendor. Should be used with 4126 * the understanding that it violates the interface boundaries, and should be 4127 * a last resort only. 4128 */ 4129 int 4130 if_setdev(if_t ifp, void *dev) 4131 { 4132 return (0); 4133 } 4134 4135 int 4136 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4137 { 4138 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4139 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4140 4141 return (0); 4142 } 4143 4144 int 4145 if_getdrvflags(if_t ifp) 4146 { 4147 return ((struct ifnet *)ifp)->if_drv_flags; 4148 } 4149 4150 int 4151 if_setdrvflags(if_t ifp, int flags) 4152 { 4153 ((struct ifnet *)ifp)->if_drv_flags = flags; 4154 return (0); 4155 } 4156 4157 4158 int 4159 if_setflags(if_t ifp, int flags) 4160 { 4161 ((struct ifnet *)ifp)->if_flags = flags; 4162 return (0); 4163 } 4164 4165 int 4166 if_setflagbits(if_t ifp, int set, int clear) 4167 { 4168 ((struct ifnet *)ifp)->if_flags |= set; 4169 ((struct ifnet *)ifp)->if_flags &= ~clear; 4170 4171 return (0); 4172 } 4173 4174 int 4175 if_getflags(if_t ifp) 4176 { 4177 return ((struct ifnet *)ifp)->if_flags; 4178 } 4179 4180 int 4181 if_clearhwassist(if_t ifp) 4182 { 4183 ((struct ifnet *)ifp)->if_hwassist = 0; 4184 return (0); 4185 } 4186 4187 int 4188 if_sethwassistbits(if_t ifp, int toset, int toclear) 4189 { 4190 ((struct ifnet *)ifp)->if_hwassist |= toset; 4191 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4192 4193 return (0); 4194 } 4195 4196 int 4197 if_sethwassist(if_t ifp, int hwassist_bit) 4198 { 4199 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4200 return (0); 4201 } 4202 4203 int 4204 if_gethwassist(if_t ifp) 4205 { 4206 return ((struct ifnet *)ifp)->if_hwassist; 4207 } 4208 4209 int 4210 if_setmtu(if_t ifp, int mtu) 4211 { 4212 ((struct ifnet *)ifp)->if_mtu = mtu; 4213 return (0); 4214 } 4215 4216 int 4217 if_getmtu(if_t ifp) 4218 { 4219 return ((struct ifnet *)ifp)->if_mtu; 4220 } 4221 4222 int 4223 if_getmtu_family(if_t ifp, int family) 4224 { 4225 struct domain *dp; 4226 4227 for (dp = domains; dp; dp = dp->dom_next) { 4228 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4229 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4230 } 4231 4232 return (((struct ifnet *)ifp)->if_mtu); 4233 } 4234 4235 /* 4236 * Methods for drivers to access interface unicast and multicast 4237 * link level addresses. Driver shall not know 'struct ifaddr' neither 4238 * 'struct ifmultiaddr'. 4239 */ 4240 u_int 4241 if_lladdr_count(if_t ifp) 4242 { 4243 struct epoch_tracker et; 4244 struct ifaddr *ifa; 4245 u_int count; 4246 4247 count = 0; 4248 NET_EPOCH_ENTER(et); 4249 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4250 if (ifa->ifa_addr->sa_family == AF_LINK) 4251 count++; 4252 NET_EPOCH_EXIT(et); 4253 4254 return (count); 4255 } 4256 4257 u_int 4258 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4259 { 4260 struct epoch_tracker et; 4261 struct ifaddr *ifa; 4262 u_int count; 4263 4264 MPASS(cb); 4265 4266 count = 0; 4267 NET_EPOCH_ENTER(et); 4268 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 4269 if (ifa->ifa_addr->sa_family != AF_LINK) 4270 continue; 4271 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr, 4272 count); 4273 } 4274 NET_EPOCH_EXIT(et); 4275 4276 return (count); 4277 } 4278 4279 u_int 4280 if_llmaddr_count(if_t ifp) 4281 { 4282 struct epoch_tracker et; 4283 struct ifmultiaddr *ifma; 4284 int count; 4285 4286 count = 0; 4287 NET_EPOCH_ENTER(et); 4288 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4289 if (ifma->ifma_addr->sa_family == AF_LINK) 4290 count++; 4291 NET_EPOCH_EXIT(et); 4292 4293 return (count); 4294 } 4295 4296 u_int 4297 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4298 { 4299 struct epoch_tracker et; 4300 struct ifmultiaddr *ifma; 4301 u_int count; 4302 4303 MPASS(cb); 4304 4305 count = 0; 4306 NET_EPOCH_ENTER(et); 4307 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 4308 if (ifma->ifma_addr->sa_family != AF_LINK) 4309 continue; 4310 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr, 4311 count); 4312 } 4313 NET_EPOCH_EXIT(et); 4314 4315 return (count); 4316 } 4317 4318 int 4319 if_setsoftc(if_t ifp, void *softc) 4320 { 4321 ((struct ifnet *)ifp)->if_softc = softc; 4322 return (0); 4323 } 4324 4325 void * 4326 if_getsoftc(if_t ifp) 4327 { 4328 return ((struct ifnet *)ifp)->if_softc; 4329 } 4330 4331 void 4332 if_setrcvif(struct mbuf *m, if_t ifp) 4333 { 4334 4335 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4336 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4337 } 4338 4339 void 4340 if_setvtag(struct mbuf *m, uint16_t tag) 4341 { 4342 m->m_pkthdr.ether_vtag = tag; 4343 } 4344 4345 uint16_t 4346 if_getvtag(struct mbuf *m) 4347 { 4348 4349 return (m->m_pkthdr.ether_vtag); 4350 } 4351 4352 int 4353 if_sendq_empty(if_t ifp) 4354 { 4355 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4356 } 4357 4358 struct ifaddr * 4359 if_getifaddr(if_t ifp) 4360 { 4361 return ((struct ifnet *)ifp)->if_addr; 4362 } 4363 4364 int 4365 if_getamcount(if_t ifp) 4366 { 4367 return ((struct ifnet *)ifp)->if_amcount; 4368 } 4369 4370 4371 int 4372 if_setsendqready(if_t ifp) 4373 { 4374 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4375 return (0); 4376 } 4377 4378 int 4379 if_setsendqlen(if_t ifp, int tx_desc_count) 4380 { 4381 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4382 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4383 4384 return (0); 4385 } 4386 4387 int 4388 if_vlantrunkinuse(if_t ifp) 4389 { 4390 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4391 } 4392 4393 int 4394 if_input(if_t ifp, struct mbuf* sendmp) 4395 { 4396 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4397 return (0); 4398 4399 } 4400 4401 struct mbuf * 4402 if_dequeue(if_t ifp) 4403 { 4404 struct mbuf *m; 4405 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4406 4407 return (m); 4408 } 4409 4410 int 4411 if_sendq_prepend(if_t ifp, struct mbuf *m) 4412 { 4413 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4414 return (0); 4415 } 4416 4417 int 4418 if_setifheaderlen(if_t ifp, int len) 4419 { 4420 ((struct ifnet *)ifp)->if_hdrlen = len; 4421 return (0); 4422 } 4423 4424 caddr_t 4425 if_getlladdr(if_t ifp) 4426 { 4427 return (IF_LLADDR((struct ifnet *)ifp)); 4428 } 4429 4430 void * 4431 if_gethandle(u_char type) 4432 { 4433 return (if_alloc(type)); 4434 } 4435 4436 void 4437 if_bpfmtap(if_t ifh, struct mbuf *m) 4438 { 4439 struct ifnet *ifp = (struct ifnet *)ifh; 4440 4441 BPF_MTAP(ifp, m); 4442 } 4443 4444 void 4445 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4446 { 4447 struct ifnet *ifp = (struct ifnet *)ifh; 4448 4449 ETHER_BPF_MTAP(ifp, m); 4450 } 4451 4452 void 4453 if_vlancap(if_t ifh) 4454 { 4455 struct ifnet *ifp = (struct ifnet *)ifh; 4456 VLAN_CAPABILITIES(ifp); 4457 } 4458 4459 int 4460 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4461 { 4462 4463 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4464 return (0); 4465 } 4466 4467 int 4468 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4469 { 4470 4471 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4472 return (0); 4473 } 4474 4475 int 4476 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4477 { 4478 4479 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4480 return (0); 4481 } 4482 4483 u_int 4484 if_gethwtsomax(if_t ifp) 4485 { 4486 4487 return (((struct ifnet *)ifp)->if_hw_tsomax); 4488 } 4489 4490 u_int 4491 if_gethwtsomaxsegcount(if_t ifp) 4492 { 4493 4494 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4495 } 4496 4497 u_int 4498 if_gethwtsomaxsegsize(if_t ifp) 4499 { 4500 4501 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4502 } 4503 4504 void 4505 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4506 { 4507 ((struct ifnet *)ifp)->if_init = init_fn; 4508 } 4509 4510 void 4511 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4512 { 4513 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4514 } 4515 4516 void 4517 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4518 { 4519 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4520 } 4521 4522 void 4523 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4524 { 4525 ((struct ifnet *)ifp)->if_transmit = start_fn; 4526 } 4527 4528 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4529 { 4530 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4531 4532 } 4533 4534 void 4535 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4536 { 4537 4538 ifp->if_get_counter = fn; 4539 } 4540 4541 /* Revisit these - These are inline functions originally. */ 4542 int 4543 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4544 { 4545 return drbr_inuse(ifh, br); 4546 } 4547 4548 struct mbuf* 4549 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4550 { 4551 return drbr_dequeue(ifh, br); 4552 } 4553 4554 int 4555 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4556 { 4557 return drbr_needs_enqueue(ifh, br); 4558 } 4559 4560 int 4561 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4562 { 4563 return drbr_enqueue(ifh, br, m); 4564 4565 } 4566