1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_inet6.h" 36 #include "opt_inet.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/conf.h> 41 #include <sys/malloc.h> 42 #include <sys/sbuf.h> 43 #include <sys/bus.h> 44 #include <sys/epoch.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/refcount.h> 55 #include <sys/module.h> 56 #include <sys/rwlock.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/taskqueue.h> 62 #include <sys/domain.h> 63 #include <sys/jail.h> 64 #include <sys/priv.h> 65 66 #include <machine/stdarg.h> 67 #include <vm/uma.h> 68 69 #include <net/bpf.h> 70 #include <net/ethernet.h> 71 #include <net/if.h> 72 #include <net/if_arp.h> 73 #include <net/if_clone.h> 74 #include <net/if_dl.h> 75 #include <net/if_types.h> 76 #include <net/if_var.h> 77 #include <net/if_media.h> 78 #include <net/if_vlan_var.h> 79 #include <net/radix.h> 80 #include <net/route.h> 81 #include <net/vnet.h> 82 83 #if defined(INET) || defined(INET6) 84 #include <net/ethernet.h> 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_carp.h> 89 #ifdef INET 90 #include <netinet/if_ether.h> 91 #include <netinet/netdump/netdump.h> 92 #endif /* INET */ 93 #ifdef INET6 94 #include <netinet6/in6_var.h> 95 #include <netinet6/in6_ifattach.h> 96 #endif /* INET6 */ 97 #endif /* INET || INET6 */ 98 99 #include <security/mac/mac_framework.h> 100 101 /* 102 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 103 * and ifr_ifru when it is used in SIOCGIFCONF. 104 */ 105 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 106 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 107 108 __read_mostly epoch_t net_epoch_preempt; 109 __read_mostly epoch_t net_epoch; 110 #ifdef COMPAT_FREEBSD32 111 #include <sys/mount.h> 112 #include <compat/freebsd32/freebsd32.h> 113 114 struct ifreq_buffer32 { 115 uint32_t length; /* (size_t) */ 116 uint32_t buffer; /* (void *) */ 117 }; 118 119 /* 120 * Interface request structure used for socket 121 * ioctl's. All interface ioctl's must have parameter 122 * definitions which begin with ifr_name. The 123 * remainder may be interface specific. 124 */ 125 struct ifreq32 { 126 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 127 union { 128 struct sockaddr ifru_addr; 129 struct sockaddr ifru_dstaddr; 130 struct sockaddr ifru_broadaddr; 131 struct ifreq_buffer32 ifru_buffer; 132 short ifru_flags[2]; 133 short ifru_index; 134 int ifru_jid; 135 int ifru_metric; 136 int ifru_mtu; 137 int ifru_phys; 138 int ifru_media; 139 uint32_t ifru_data; 140 int ifru_cap[2]; 141 u_int ifru_fib; 142 u_char ifru_vlan_pcp; 143 } ifr_ifru; 144 }; 145 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 146 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 147 __offsetof(struct ifreq32, ifr_ifru)); 148 149 struct ifgroupreq32 { 150 char ifgr_name[IFNAMSIZ]; 151 u_int ifgr_len; 152 union { 153 char ifgru_group[IFNAMSIZ]; 154 uint32_t ifgru_groups; 155 } ifgr_ifgru; 156 }; 157 158 struct ifmediareq32 { 159 char ifm_name[IFNAMSIZ]; 160 int ifm_current; 161 int ifm_mask; 162 int ifm_status; 163 int ifm_active; 164 int ifm_count; 165 uint32_t ifm_ulist; /* (int *) */ 166 }; 167 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 168 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 169 170 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 171 case _IOC_NEWTYPE((cmd), struct ifgroupreq32): 172 #else /* !COMPAT_FREEBSD32 */ 173 #define _CASE_IOC_IFGROUPREQ_32(cmd) 174 #endif /* !COMPAT_FREEBSD32 */ 175 176 #define CASE_IOC_IFGROUPREQ(cmd) \ 177 _CASE_IOC_IFGROUPREQ_32(cmd) \ 178 case (cmd) 179 180 union ifreq_union { 181 struct ifreq ifr; 182 #ifdef COMPAT_FREEBSD32 183 struct ifreq32 ifr32; 184 #endif 185 }; 186 187 union ifgroupreq_union { 188 struct ifgroupreq ifgr; 189 #ifdef COMPAT_FREEBSD32 190 struct ifgroupreq32 ifgr32; 191 #endif 192 }; 193 194 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 195 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 196 197 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 198 &ifqmaxlen, 0, "max send queue size"); 199 200 /* Log link state change events */ 201 static int log_link_state_change = 1; 202 203 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 204 &log_link_state_change, 0, 205 "log interface link state change events"); 206 207 /* Log promiscuous mode change events */ 208 static int log_promisc_mode_change = 1; 209 210 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 211 &log_promisc_mode_change, 1, 212 "log promiscuous mode change events"); 213 214 /* Interface description */ 215 static unsigned int ifdescr_maxlen = 1024; 216 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 217 &ifdescr_maxlen, 0, 218 "administrative maximum length for interface description"); 219 220 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 221 222 /* global sx for non-critical path ifdescr */ 223 static struct sx ifdescr_sx; 224 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 225 226 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 227 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 228 /* These are external hooks for CARP. */ 229 void (*carp_linkstate_p)(struct ifnet *ifp); 230 void (*carp_demote_adj_p)(int, char *); 231 int (*carp_master_p)(struct ifaddr *); 232 #if defined(INET) || defined(INET6) 233 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 234 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 235 const struct sockaddr *sa); 236 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 237 int (*carp_attach_p)(struct ifaddr *, int); 238 void (*carp_detach_p)(struct ifaddr *, bool); 239 #endif 240 #ifdef INET 241 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 242 #endif 243 #ifdef INET6 244 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 245 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 246 const struct in6_addr *taddr); 247 #endif 248 249 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 250 251 /* 252 * XXX: Style; these should be sorted alphabetically, and unprototyped 253 * static functions should be prototyped. Currently they are sorted by 254 * declaration order. 255 */ 256 static void if_attachdomain(void *); 257 static void if_attachdomain1(struct ifnet *); 258 static int ifconf(u_long, caddr_t); 259 static void *if_grow(void); 260 static void if_input_default(struct ifnet *, struct mbuf *); 261 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 262 static void if_route(struct ifnet *, int flag, int fam); 263 static int if_setflag(struct ifnet *, int, int, int *, int); 264 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 265 static void if_unroute(struct ifnet *, int flag, int fam); 266 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 267 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 268 static void do_link_state_change(void *, int); 269 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 270 static int if_getgroupmembers(struct ifgroupreq *); 271 static void if_delgroups(struct ifnet *); 272 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 273 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 274 #ifdef VIMAGE 275 static void if_vmove(struct ifnet *, struct vnet *); 276 #endif 277 278 #ifdef INET6 279 /* 280 * XXX: declare here to avoid to include many inet6 related files.. 281 * should be more generalized? 282 */ 283 extern void nd6_setmtu(struct ifnet *); 284 #endif 285 286 /* ipsec helper hooks */ 287 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 289 290 VNET_DEFINE(int, if_index); 291 int ifqmaxlen = IFQ_MAXLEN; 292 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 293 VNET_DEFINE(struct ifgrouphead, ifg_head); 294 295 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 296 297 /* Table of ifnet by index. */ 298 VNET_DEFINE(struct ifnet **, ifindex_table); 299 300 #define V_if_indexlim VNET(if_indexlim) 301 #define V_ifindex_table VNET(ifindex_table) 302 303 /* 304 * The global network interface list (V_ifnet) and related state (such as 305 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 306 * an rwlock. Either may be acquired shared to stablize the list, but both 307 * must be acquired writable to modify the list. This model allows us to 308 * both stablize the interface list during interrupt thread processing, but 309 * also to stablize it over long-running ioctls, without introducing priority 310 * inversions and deadlocks. 311 */ 312 struct rwlock ifnet_rwlock; 313 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 314 struct sx ifnet_sxlock; 315 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 316 317 /* 318 * The allocation of network interfaces is a rather non-atomic affair; we 319 * need to select an index before we are ready to expose the interface for 320 * use, so will use this pointer value to indicate reservation. 321 */ 322 #define IFNET_HOLD (void *)(uintptr_t)(-1) 323 324 static if_com_alloc_t *if_com_alloc[256]; 325 static if_com_free_t *if_com_free[256]; 326 327 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 328 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 329 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 330 331 struct ifnet * 332 ifnet_byindex_locked(u_short idx) 333 { 334 335 if (idx > V_if_index) 336 return (NULL); 337 if (V_ifindex_table[idx] == IFNET_HOLD) 338 return (NULL); 339 return (V_ifindex_table[idx]); 340 } 341 342 struct ifnet * 343 ifnet_byindex(u_short idx) 344 { 345 struct ifnet *ifp; 346 347 ifp = ifnet_byindex_locked(idx); 348 return (ifp); 349 } 350 351 struct ifnet * 352 ifnet_byindex_ref(u_short idx) 353 { 354 struct ifnet *ifp; 355 356 IFNET_RLOCK_NOSLEEP(); 357 ifp = ifnet_byindex_locked(idx); 358 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 359 IFNET_RUNLOCK_NOSLEEP(); 360 return (NULL); 361 } 362 if_ref(ifp); 363 IFNET_RUNLOCK_NOSLEEP(); 364 return (ifp); 365 } 366 367 /* 368 * Allocate an ifindex array entry; return 0 on success or an error on 369 * failure. 370 */ 371 static u_short 372 ifindex_alloc(void **old) 373 { 374 u_short idx; 375 376 IFNET_WLOCK_ASSERT(); 377 /* 378 * Try to find an empty slot below V_if_index. If we fail, take the 379 * next slot. 380 */ 381 for (idx = 1; idx <= V_if_index; idx++) { 382 if (V_ifindex_table[idx] == NULL) 383 break; 384 } 385 386 /* Catch if_index overflow. */ 387 if (idx >= V_if_indexlim) { 388 *old = if_grow(); 389 return (USHRT_MAX); 390 } 391 if (idx > V_if_index) 392 V_if_index = idx; 393 return (idx); 394 } 395 396 static void 397 ifindex_free_locked(u_short idx) 398 { 399 400 IFNET_WLOCK_ASSERT(); 401 402 V_ifindex_table[idx] = NULL; 403 while (V_if_index > 0 && 404 V_ifindex_table[V_if_index] == NULL) 405 V_if_index--; 406 } 407 408 static void 409 ifindex_free(u_short idx) 410 { 411 412 IFNET_WLOCK(); 413 ifindex_free_locked(idx); 414 IFNET_WUNLOCK(); 415 } 416 417 static void 418 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 419 { 420 421 V_ifindex_table[idx] = ifp; 422 } 423 424 struct ifaddr * 425 ifaddr_byindex(u_short idx) 426 { 427 struct ifnet *ifp; 428 struct ifaddr *ifa = NULL; 429 430 IFNET_RLOCK_NOSLEEP(); 431 ifp = ifnet_byindex_locked(idx); 432 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 433 ifa_ref(ifa); 434 IFNET_RUNLOCK_NOSLEEP(); 435 return (ifa); 436 } 437 438 /* 439 * Network interface utility routines. 440 * 441 * Routines with ifa_ifwith* names take sockaddr *'s as 442 * parameters. 443 */ 444 445 static void 446 vnet_if_init(const void *unused __unused) 447 { 448 void *old; 449 450 CK_STAILQ_INIT(&V_ifnet); 451 CK_STAILQ_INIT(&V_ifg_head); 452 IFNET_WLOCK(); 453 old = if_grow(); /* create initial table */ 454 IFNET_WUNLOCK(); 455 epoch_wait_preempt(net_epoch_preempt); 456 free(old, M_IFNET); 457 vnet_if_clone_init(); 458 } 459 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 460 NULL); 461 462 #ifdef VIMAGE 463 static void 464 vnet_if_uninit(const void *unused __unused) 465 { 466 467 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 468 "not empty", __func__, __LINE__, &V_ifnet)); 469 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 470 "not empty", __func__, __LINE__, &V_ifg_head)); 471 472 free((caddr_t)V_ifindex_table, M_IFNET); 473 } 474 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 475 vnet_if_uninit, NULL); 476 477 static void 478 vnet_if_return(const void *unused __unused) 479 { 480 struct ifnet *ifp, *nifp; 481 482 /* Return all inherited interfaces to their parent vnets. */ 483 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 484 if (ifp->if_home_vnet != ifp->if_vnet) 485 if_vmove(ifp, ifp->if_home_vnet); 486 } 487 } 488 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 489 vnet_if_return, NULL); 490 #endif 491 492 493 static void * 494 if_grow(void) 495 { 496 int oldlim; 497 u_int n; 498 struct ifnet **e; 499 void *old; 500 501 old = NULL; 502 IFNET_WLOCK_ASSERT(); 503 oldlim = V_if_indexlim; 504 IFNET_WUNLOCK(); 505 n = (oldlim << 1) * sizeof(*e); 506 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 507 IFNET_WLOCK(); 508 if (V_if_indexlim != oldlim) { 509 free(e, M_IFNET); 510 return (NULL); 511 } 512 if (V_ifindex_table != NULL) { 513 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 514 old = V_ifindex_table; 515 } 516 V_if_indexlim <<= 1; 517 V_ifindex_table = e; 518 return (old); 519 } 520 521 /* 522 * Allocate a struct ifnet and an index for an interface. A layer 2 523 * common structure will also be allocated if an allocation routine is 524 * registered for the passed type. 525 */ 526 struct ifnet * 527 if_alloc(u_char type) 528 { 529 struct ifnet *ifp; 530 u_short idx; 531 void *old; 532 533 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 534 restart: 535 IFNET_WLOCK(); 536 idx = ifindex_alloc(&old); 537 if (__predict_false(idx == USHRT_MAX)) { 538 IFNET_WUNLOCK(); 539 epoch_wait_preempt(net_epoch_preempt); 540 free(old, M_IFNET); 541 goto restart; 542 } 543 ifnet_setbyindex(idx, IFNET_HOLD); 544 IFNET_WUNLOCK(); 545 ifp->if_index = idx; 546 ifp->if_type = type; 547 ifp->if_alloctype = type; 548 #ifdef VIMAGE 549 ifp->if_vnet = curvnet; 550 #endif 551 if (if_com_alloc[type] != NULL) { 552 ifp->if_l2com = if_com_alloc[type](type, ifp); 553 if (ifp->if_l2com == NULL) { 554 free(ifp, M_IFNET); 555 ifindex_free(idx); 556 return (NULL); 557 } 558 } 559 560 IF_ADDR_LOCK_INIT(ifp); 561 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, 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 /* 582 * Do the actual work of freeing a struct ifnet, and layer 2 common 583 * structure. This call is made when the last reference to an 584 * interface is released. 585 */ 586 static void 587 if_free_internal(struct ifnet *ifp) 588 { 589 590 KASSERT((ifp->if_flags & IFF_DYING), 591 ("if_free_internal: interface not dying")); 592 593 if (if_com_free[ifp->if_alloctype] != NULL) 594 if_com_free[ifp->if_alloctype](ifp->if_l2com, 595 ifp->if_alloctype); 596 597 #ifdef MAC 598 mac_ifnet_destroy(ifp); 599 #endif /* MAC */ 600 if (ifp->if_description != NULL) 601 free(ifp->if_description, M_IFDESCR); 602 IF_AFDATA_DESTROY(ifp); 603 IF_ADDR_LOCK_DESTROY(ifp); 604 ifq_delete(&ifp->if_snd); 605 606 for (int i = 0; i < IFCOUNTERS; i++) 607 counter_u64_free(ifp->if_counters[i]); 608 609 free(ifp, M_IFNET); 610 } 611 612 static void 613 if_destroy(epoch_context_t ctx) 614 { 615 struct ifnet *ifp; 616 617 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 618 if_free_internal(ifp); 619 } 620 621 /* 622 * Deregister an interface and free the associated storage. 623 */ 624 void 625 if_free(struct ifnet *ifp) 626 { 627 628 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 629 630 CURVNET_SET_QUIET(ifp->if_vnet); 631 IFNET_WLOCK(); 632 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 633 ("%s: freeing unallocated ifnet", ifp->if_xname)); 634 635 ifindex_free_locked(ifp->if_index); 636 IFNET_WUNLOCK(); 637 638 if (refcount_release(&ifp->if_refcount)) 639 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 640 CURVNET_RESTORE(); 641 } 642 643 /* 644 * Interfaces to keep an ifnet type-stable despite the possibility of the 645 * driver calling if_free(). If there are additional references, we defer 646 * freeing the underlying data structure. 647 */ 648 void 649 if_ref(struct ifnet *ifp) 650 { 651 652 /* We don't assert the ifnet list lock here, but arguably should. */ 653 refcount_acquire(&ifp->if_refcount); 654 } 655 656 void 657 if_rele(struct ifnet *ifp) 658 { 659 660 if (!refcount_release(&ifp->if_refcount)) 661 return; 662 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 663 } 664 665 void 666 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 667 { 668 669 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 670 671 if (ifq->ifq_maxlen == 0) 672 ifq->ifq_maxlen = ifqmaxlen; 673 674 ifq->altq_type = 0; 675 ifq->altq_disc = NULL; 676 ifq->altq_flags &= ALTQF_CANTCHANGE; 677 ifq->altq_tbr = NULL; 678 ifq->altq_ifp = ifp; 679 } 680 681 void 682 ifq_delete(struct ifaltq *ifq) 683 { 684 mtx_destroy(&ifq->ifq_mtx); 685 } 686 687 /* 688 * Perform generic interface initialization tasks and attach the interface 689 * to the list of "active" interfaces. If vmove flag is set on entry 690 * to if_attach_internal(), perform only a limited subset of initialization 691 * tasks, given that we are moving from one vnet to another an ifnet which 692 * has already been fully initialized. 693 * 694 * Note that if_detach_internal() removes group membership unconditionally 695 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 696 * Thus, when if_vmove() is applied to a cloned interface, group membership 697 * is lost while a cloned one always joins a group whose name is 698 * ifc->ifc_name. To recover this after if_detach_internal() and 699 * if_attach_internal(), the cloner should be specified to 700 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 701 * attempts to join a group whose name is ifc->ifc_name. 702 * 703 * XXX: 704 * - The decision to return void and thus require this function to 705 * succeed is questionable. 706 * - We should probably do more sanity checking. For instance we don't 707 * do anything to insure if_xname is unique or non-empty. 708 */ 709 void 710 if_attach(struct ifnet *ifp) 711 { 712 713 if_attach_internal(ifp, 0, NULL); 714 } 715 716 /* 717 * Compute the least common TSO limit. 718 */ 719 void 720 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 721 { 722 /* 723 * 1) If there is no limit currently, take the limit from 724 * the network adapter. 725 * 726 * 2) If the network adapter has a limit below the current 727 * limit, apply it. 728 */ 729 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 730 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 731 pmax->tsomaxbytes = ifp->if_hw_tsomax; 732 } 733 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 734 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 735 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 736 } 737 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 738 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 739 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 740 } 741 } 742 743 /* 744 * Update TSO limit of a network adapter. 745 * 746 * Returns zero if no change. Else non-zero. 747 */ 748 int 749 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 750 { 751 int retval = 0; 752 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 753 ifp->if_hw_tsomax = pmax->tsomaxbytes; 754 retval++; 755 } 756 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 757 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 758 retval++; 759 } 760 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 761 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 762 retval++; 763 } 764 return (retval); 765 } 766 767 static void 768 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 769 { 770 unsigned socksize, ifasize; 771 int namelen, masklen; 772 struct sockaddr_dl *sdl; 773 struct ifaddr *ifa; 774 775 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 776 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 777 ifp->if_xname); 778 779 #ifdef VIMAGE 780 ifp->if_vnet = curvnet; 781 if (ifp->if_home_vnet == NULL) 782 ifp->if_home_vnet = curvnet; 783 #endif 784 785 if_addgroup(ifp, IFG_ALL); 786 787 /* Restore group membership for cloned interfaces. */ 788 if (vmove && ifc != NULL) 789 if_clone_addgroup(ifp, ifc); 790 791 getmicrotime(&ifp->if_lastchange); 792 ifp->if_epoch = time_uptime; 793 794 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 795 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 796 ("transmit and qflush must both either be set or both be NULL")); 797 if (ifp->if_transmit == NULL) { 798 ifp->if_transmit = if_transmit; 799 ifp->if_qflush = if_qflush; 800 } 801 if (ifp->if_input == NULL) 802 ifp->if_input = if_input_default; 803 804 if (ifp->if_requestencap == NULL) 805 ifp->if_requestencap = if_requestencap_default; 806 807 if (!vmove) { 808 #ifdef MAC 809 mac_ifnet_create(ifp); 810 #endif 811 812 /* 813 * Create a Link Level name for this device. 814 */ 815 namelen = strlen(ifp->if_xname); 816 /* 817 * Always save enough space for any possiable name so we 818 * can do a rename in place later. 819 */ 820 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 821 socksize = masklen + ifp->if_addrlen; 822 if (socksize < sizeof(*sdl)) 823 socksize = sizeof(*sdl); 824 socksize = roundup2(socksize, sizeof(long)); 825 ifasize = sizeof(*ifa) + 2 * socksize; 826 ifa = ifa_alloc(ifasize, M_WAITOK); 827 sdl = (struct sockaddr_dl *)(ifa + 1); 828 sdl->sdl_len = socksize; 829 sdl->sdl_family = AF_LINK; 830 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 831 sdl->sdl_nlen = namelen; 832 sdl->sdl_index = ifp->if_index; 833 sdl->sdl_type = ifp->if_type; 834 ifp->if_addr = ifa; 835 ifa->ifa_ifp = ifp; 836 ifa->ifa_rtrequest = link_rtrequest; 837 ifa->ifa_addr = (struct sockaddr *)sdl; 838 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 839 ifa->ifa_netmask = (struct sockaddr *)sdl; 840 sdl->sdl_len = masklen; 841 while (namelen != 0) 842 sdl->sdl_data[--namelen] = 0xff; 843 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 844 /* Reliably crash if used uninitialized. */ 845 ifp->if_broadcastaddr = NULL; 846 847 if (ifp->if_type == IFT_ETHER) { 848 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 849 M_WAITOK | M_ZERO); 850 } 851 852 #if defined(INET) || defined(INET6) 853 /* Use defaults for TSO, if nothing is set */ 854 if (ifp->if_hw_tsomax == 0 && 855 ifp->if_hw_tsomaxsegcount == 0 && 856 ifp->if_hw_tsomaxsegsize == 0) { 857 /* 858 * The TSO defaults needs to be such that an 859 * NFS mbuf list of 35 mbufs totalling just 860 * below 64K works and that a chain of mbufs 861 * can be defragged into at most 32 segments: 862 */ 863 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 864 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 865 ifp->if_hw_tsomaxsegcount = 35; 866 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 867 868 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 869 if (ifp->if_capabilities & IFCAP_TSO) { 870 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 871 ifp->if_hw_tsomax, 872 ifp->if_hw_tsomaxsegcount, 873 ifp->if_hw_tsomaxsegsize); 874 } 875 } 876 #endif 877 } 878 #ifdef VIMAGE 879 else { 880 /* 881 * Update the interface index in the link layer address 882 * of the interface. 883 */ 884 for (ifa = ifp->if_addr; ifa != NULL; 885 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 886 if (ifa->ifa_addr->sa_family == AF_LINK) { 887 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 888 sdl->sdl_index = ifp->if_index; 889 } 890 } 891 } 892 #endif 893 894 IFNET_WLOCK(); 895 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 896 #ifdef VIMAGE 897 curvnet->vnet_ifcnt++; 898 #endif 899 IFNET_WUNLOCK(); 900 901 if (domain_init_status >= 2) 902 if_attachdomain1(ifp); 903 904 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 905 if (IS_DEFAULT_VNET(curvnet)) 906 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 907 908 /* Announce the interface. */ 909 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 910 } 911 912 static void 913 if_epochalloc(void *dummy __unused) 914 { 915 916 net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT); 917 net_epoch = epoch_alloc(0); 918 } 919 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 920 if_epochalloc, NULL); 921 922 static void 923 if_attachdomain(void *dummy) 924 { 925 struct ifnet *ifp; 926 927 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 928 if_attachdomain1(ifp); 929 } 930 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 931 if_attachdomain, NULL); 932 933 static void 934 if_attachdomain1(struct ifnet *ifp) 935 { 936 struct domain *dp; 937 938 /* 939 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 940 * cannot lock ifp->if_afdata initialization, entirely. 941 */ 942 IF_AFDATA_LOCK(ifp); 943 if (ifp->if_afdata_initialized >= domain_init_status) { 944 IF_AFDATA_UNLOCK(ifp); 945 log(LOG_WARNING, "%s called more than once on %s\n", 946 __func__, ifp->if_xname); 947 return; 948 } 949 ifp->if_afdata_initialized = domain_init_status; 950 IF_AFDATA_UNLOCK(ifp); 951 952 /* address family dependent data region */ 953 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 954 for (dp = domains; dp; dp = dp->dom_next) { 955 if (dp->dom_ifattach) 956 ifp->if_afdata[dp->dom_family] = 957 (*dp->dom_ifattach)(ifp); 958 } 959 } 960 961 /* 962 * Remove any unicast or broadcast network addresses from an interface. 963 */ 964 void 965 if_purgeaddrs(struct ifnet *ifp) 966 { 967 struct ifaddr *ifa; 968 969 while (1) { 970 NET_EPOCH_ENTER(); 971 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 972 if (ifa->ifa_addr->sa_family != AF_LINK) 973 break; 974 } 975 NET_EPOCH_EXIT(); 976 977 if (ifa == NULL) 978 break; 979 #ifdef INET 980 /* XXX: Ugly!! ad hoc just for INET */ 981 if (ifa->ifa_addr->sa_family == AF_INET) { 982 struct ifaliasreq ifr; 983 984 bzero(&ifr, sizeof(ifr)); 985 ifr.ifra_addr = *ifa->ifa_addr; 986 if (ifa->ifa_dstaddr) 987 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 988 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 989 NULL) == 0) 990 continue; 991 } 992 #endif /* INET */ 993 #ifdef INET6 994 if (ifa->ifa_addr->sa_family == AF_INET6) { 995 in6_purgeaddr(ifa); 996 /* ifp_addrhead is already updated */ 997 continue; 998 } 999 #endif /* INET6 */ 1000 IF_ADDR_WLOCK(ifp); 1001 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1002 IF_ADDR_WUNLOCK(ifp); 1003 ifa_free(ifa); 1004 } 1005 } 1006 1007 /* 1008 * Remove any multicast network addresses from an interface when an ifnet 1009 * is going away. 1010 */ 1011 static void 1012 if_purgemaddrs(struct ifnet *ifp) 1013 { 1014 struct ifmultiaddr *ifma; 1015 1016 IF_ADDR_WLOCK(ifp); 1017 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1018 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1019 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1020 if_delmulti_locked(ifp, ifma, 1); 1021 } 1022 IF_ADDR_WUNLOCK(ifp); 1023 } 1024 1025 /* 1026 * Detach an interface, removing it from the list of "active" interfaces. 1027 * If vmove flag is set on entry to if_detach_internal(), perform only a 1028 * limited subset of cleanup tasks, given that we are moving an ifnet from 1029 * one vnet to another, where it must be fully operational. 1030 * 1031 * XXXRW: There are some significant questions about event ordering, and 1032 * how to prevent things from starting to use the interface during detach. 1033 */ 1034 void 1035 if_detach(struct ifnet *ifp) 1036 { 1037 1038 CURVNET_SET_QUIET(ifp->if_vnet); 1039 if_detach_internal(ifp, 0, NULL); 1040 CURVNET_RESTORE(); 1041 } 1042 1043 /* 1044 * The vmove flag, if set, indicates that we are called from a callpath 1045 * that is moving an interface to a different vnet instance. 1046 * 1047 * The shutdown flag, if set, indicates that we are called in the 1048 * process of shutting down a vnet instance. Currently only the 1049 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1050 * on a vnet instance shutdown without this flag being set, e.g., when 1051 * the cloned interfaces are destoyed as first thing of teardown. 1052 */ 1053 static int 1054 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1055 { 1056 struct ifaddr *ifa; 1057 int i; 1058 struct domain *dp; 1059 struct ifnet *iter; 1060 int found = 0; 1061 #ifdef VIMAGE 1062 int shutdown; 1063 1064 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1065 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1066 #endif 1067 IFNET_WLOCK(); 1068 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1069 if (iter == ifp) { 1070 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1071 found = 1; 1072 break; 1073 } 1074 IFNET_WUNLOCK(); 1075 if (!found) { 1076 /* 1077 * While we would want to panic here, we cannot 1078 * guarantee that the interface is indeed still on 1079 * the list given we don't hold locks all the way. 1080 */ 1081 return (ENOENT); 1082 #if 0 1083 if (vmove) 1084 panic("%s: ifp=%p not on the ifnet tailq %p", 1085 __func__, ifp, &V_ifnet); 1086 else 1087 return; /* XXX this should panic as well? */ 1088 #endif 1089 } 1090 1091 /* 1092 * At this point we know the interface still was on the ifnet list 1093 * and we removed it so we are in a stable state. 1094 */ 1095 #ifdef VIMAGE 1096 curvnet->vnet_ifcnt--; 1097 #endif 1098 epoch_wait_preempt(net_epoch_preempt); 1099 /* 1100 * In any case (destroy or vmove) detach us from the groups 1101 * and remove/wait for pending events on the taskq. 1102 * XXX-BZ in theory an interface could still enqueue a taskq change? 1103 */ 1104 if_delgroups(ifp); 1105 1106 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1107 1108 /* 1109 * Check if this is a cloned interface or not. Must do even if 1110 * shutting down as a if_vmove_reclaim() would move the ifp and 1111 * the if_clone_addgroup() will have a corrupted string overwise 1112 * from a gibberish pointer. 1113 */ 1114 if (vmove && ifcp != NULL) 1115 *ifcp = if_clone_findifc(ifp); 1116 1117 if_down(ifp); 1118 1119 #ifdef VIMAGE 1120 /* 1121 * On VNET shutdown abort here as the stack teardown will do all 1122 * the work top-down for us. 1123 */ 1124 if (shutdown) { 1125 /* Give interface users the chance to clean up. */ 1126 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1127 1128 /* 1129 * In case of a vmove we are done here without error. 1130 * If we would signal an error it would lead to the same 1131 * abort as if we did not find the ifnet anymore. 1132 * if_detach() calls us in void context and does not care 1133 * about an early abort notification, so life is splendid :) 1134 */ 1135 goto finish_vnet_shutdown; 1136 } 1137 #endif 1138 1139 /* 1140 * At this point we are not tearing down a VNET and are either 1141 * going to destroy or vmove the interface and have to cleanup 1142 * accordingly. 1143 */ 1144 1145 /* 1146 * Remove routes and flush queues. 1147 */ 1148 #ifdef ALTQ 1149 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1150 altq_disable(&ifp->if_snd); 1151 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1152 altq_detach(&ifp->if_snd); 1153 #endif 1154 1155 if_purgeaddrs(ifp); 1156 1157 #ifdef INET 1158 in_ifdetach(ifp); 1159 #endif 1160 1161 #ifdef INET6 1162 /* 1163 * Remove all IPv6 kernel structs related to ifp. This should be done 1164 * before removing routing entries below, since IPv6 interface direct 1165 * routes are expected to be removed by the IPv6-specific kernel API. 1166 * Otherwise, the kernel will detect some inconsistency and bark it. 1167 */ 1168 in6_ifdetach(ifp); 1169 #endif 1170 if_purgemaddrs(ifp); 1171 1172 /* Announce that the interface is gone. */ 1173 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1174 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1175 if (IS_DEFAULT_VNET(curvnet)) 1176 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1177 1178 if (!vmove) { 1179 /* 1180 * Prevent further calls into the device driver via ifnet. 1181 */ 1182 if_dead(ifp); 1183 1184 /* 1185 * Remove link ifaddr pointer and maybe decrement if_index. 1186 * Clean up all addresses. 1187 */ 1188 free(ifp->if_hw_addr, M_IFADDR); 1189 ifp->if_hw_addr = NULL; 1190 ifp->if_addr = NULL; 1191 1192 /* We can now free link ifaddr. */ 1193 IF_ADDR_WLOCK(ifp); 1194 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1195 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1196 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1197 IF_ADDR_WUNLOCK(ifp); 1198 ifa_free(ifa); 1199 } else 1200 IF_ADDR_WUNLOCK(ifp); 1201 } 1202 1203 rt_flushifroutes(ifp); 1204 1205 #ifdef VIMAGE 1206 finish_vnet_shutdown: 1207 #endif 1208 /* 1209 * We cannot hold the lock over dom_ifdetach calls as they might 1210 * sleep, for example trying to drain a callout, thus open up the 1211 * theoretical race with re-attaching. 1212 */ 1213 IF_AFDATA_LOCK(ifp); 1214 i = ifp->if_afdata_initialized; 1215 ifp->if_afdata_initialized = 0; 1216 IF_AFDATA_UNLOCK(ifp); 1217 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1218 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1219 (*dp->dom_ifdetach)(ifp, 1220 ifp->if_afdata[dp->dom_family]); 1221 ifp->if_afdata[dp->dom_family] = NULL; 1222 } 1223 } 1224 1225 return (0); 1226 } 1227 1228 #ifdef VIMAGE 1229 /* 1230 * if_vmove() performs a limited version of if_detach() in current 1231 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1232 * An attempt is made to shrink if_index in current vnet, find an 1233 * unused if_index in target vnet and calls if_grow() if necessary, 1234 * and finally find an unused if_xname for the target vnet. 1235 */ 1236 static void 1237 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1238 { 1239 struct if_clone *ifc; 1240 u_int bif_dlt, bif_hdrlen; 1241 void *old; 1242 int rc; 1243 1244 /* 1245 * if_detach_internal() will call the eventhandler to notify 1246 * interface departure. That will detach if_bpf. We need to 1247 * safe the dlt and hdrlen so we can re-attach it later. 1248 */ 1249 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1250 1251 /* 1252 * Detach from current vnet, but preserve LLADDR info, do not 1253 * mark as dead etc. so that the ifnet can be reattached later. 1254 * If we cannot find it, we lost the race to someone else. 1255 */ 1256 rc = if_detach_internal(ifp, 1, &ifc); 1257 if (rc != 0) 1258 return; 1259 1260 /* 1261 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1262 * the if_index for that vnet if possible. 1263 * 1264 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1265 * or we'd lock on one vnet and unlock on another. 1266 */ 1267 IFNET_WLOCK(); 1268 ifindex_free_locked(ifp->if_index); 1269 IFNET_WUNLOCK(); 1270 1271 /* 1272 * Perform interface-specific reassignment tasks, if provided by 1273 * the driver. 1274 */ 1275 if (ifp->if_reassign != NULL) 1276 ifp->if_reassign(ifp, new_vnet, NULL); 1277 1278 /* 1279 * Switch to the context of the target vnet. 1280 */ 1281 CURVNET_SET_QUIET(new_vnet); 1282 restart: 1283 IFNET_WLOCK(); 1284 ifp->if_index = ifindex_alloc(&old); 1285 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1286 IFNET_WUNLOCK(); 1287 epoch_wait_preempt(net_epoch_preempt); 1288 free(old, M_IFNET); 1289 goto restart; 1290 } 1291 ifnet_setbyindex(ifp->if_index, ifp); 1292 IFNET_WUNLOCK(); 1293 1294 if_attach_internal(ifp, 1, ifc); 1295 1296 if (ifp->if_bpf == NULL) 1297 bpfattach(ifp, bif_dlt, bif_hdrlen); 1298 1299 CURVNET_RESTORE(); 1300 } 1301 1302 /* 1303 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1304 */ 1305 static int 1306 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1307 { 1308 struct prison *pr; 1309 struct ifnet *difp; 1310 int shutdown; 1311 1312 /* Try to find the prison within our visibility. */ 1313 sx_slock(&allprison_lock); 1314 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1315 sx_sunlock(&allprison_lock); 1316 if (pr == NULL) 1317 return (ENXIO); 1318 prison_hold_locked(pr); 1319 mtx_unlock(&pr->pr_mtx); 1320 1321 /* Do not try to move the iface from and to the same prison. */ 1322 if (pr->pr_vnet == ifp->if_vnet) { 1323 prison_free(pr); 1324 return (EEXIST); 1325 } 1326 1327 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1328 /* XXX Lock interfaces to avoid races. */ 1329 CURVNET_SET_QUIET(pr->pr_vnet); 1330 difp = ifunit(ifname); 1331 if (difp != NULL) { 1332 CURVNET_RESTORE(); 1333 prison_free(pr); 1334 return (EEXIST); 1335 } 1336 1337 /* Make sure the VNET is stable. */ 1338 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1339 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1340 if (shutdown) { 1341 CURVNET_RESTORE(); 1342 prison_free(pr); 1343 return (EBUSY); 1344 } 1345 CURVNET_RESTORE(); 1346 1347 /* Move the interface into the child jail/vnet. */ 1348 if_vmove(ifp, pr->pr_vnet); 1349 1350 /* Report the new if_xname back to the userland. */ 1351 sprintf(ifname, "%s", ifp->if_xname); 1352 1353 prison_free(pr); 1354 return (0); 1355 } 1356 1357 static int 1358 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1359 { 1360 struct prison *pr; 1361 struct vnet *vnet_dst; 1362 struct ifnet *ifp; 1363 int shutdown; 1364 1365 /* Try to find the prison within our visibility. */ 1366 sx_slock(&allprison_lock); 1367 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1368 sx_sunlock(&allprison_lock); 1369 if (pr == NULL) 1370 return (ENXIO); 1371 prison_hold_locked(pr); 1372 mtx_unlock(&pr->pr_mtx); 1373 1374 /* Make sure the named iface exists in the source prison/vnet. */ 1375 CURVNET_SET(pr->pr_vnet); 1376 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1377 if (ifp == NULL) { 1378 CURVNET_RESTORE(); 1379 prison_free(pr); 1380 return (ENXIO); 1381 } 1382 1383 /* Do not try to move the iface from and to the same prison. */ 1384 vnet_dst = TD_TO_VNET(td); 1385 if (vnet_dst == ifp->if_vnet) { 1386 CURVNET_RESTORE(); 1387 prison_free(pr); 1388 return (EEXIST); 1389 } 1390 1391 /* Make sure the VNET is stable. */ 1392 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1393 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1394 if (shutdown) { 1395 CURVNET_RESTORE(); 1396 prison_free(pr); 1397 return (EBUSY); 1398 } 1399 1400 /* Get interface back from child jail/vnet. */ 1401 if_vmove(ifp, vnet_dst); 1402 CURVNET_RESTORE(); 1403 1404 /* Report the new if_xname back to the userland. */ 1405 sprintf(ifname, "%s", ifp->if_xname); 1406 1407 prison_free(pr); 1408 return (0); 1409 } 1410 #endif /* VIMAGE */ 1411 1412 /* 1413 * Add a group to an interface 1414 */ 1415 int 1416 if_addgroup(struct ifnet *ifp, const char *groupname) 1417 { 1418 struct ifg_list *ifgl; 1419 struct ifg_group *ifg = NULL; 1420 struct ifg_member *ifgm; 1421 int new = 0; 1422 1423 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1424 groupname[strlen(groupname) - 1] <= '9') 1425 return (EINVAL); 1426 1427 IFNET_WLOCK(); 1428 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1429 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1430 IFNET_WUNLOCK(); 1431 return (EEXIST); 1432 } 1433 1434 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1435 M_NOWAIT)) == NULL) { 1436 IFNET_WUNLOCK(); 1437 return (ENOMEM); 1438 } 1439 1440 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1441 M_TEMP, M_NOWAIT)) == NULL) { 1442 free(ifgl, M_TEMP); 1443 IFNET_WUNLOCK(); 1444 return (ENOMEM); 1445 } 1446 1447 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1448 if (!strcmp(ifg->ifg_group, groupname)) 1449 break; 1450 1451 if (ifg == NULL) { 1452 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1453 M_TEMP, M_NOWAIT)) == NULL) { 1454 free(ifgl, M_TEMP); 1455 free(ifgm, M_TEMP); 1456 IFNET_WUNLOCK(); 1457 return (ENOMEM); 1458 } 1459 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1460 ifg->ifg_refcnt = 0; 1461 CK_STAILQ_INIT(&ifg->ifg_members); 1462 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1463 new = 1; 1464 } 1465 1466 ifg->ifg_refcnt++; 1467 ifgl->ifgl_group = ifg; 1468 ifgm->ifgm_ifp = ifp; 1469 1470 IF_ADDR_WLOCK(ifp); 1471 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1472 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1473 IF_ADDR_WUNLOCK(ifp); 1474 1475 IFNET_WUNLOCK(); 1476 1477 if (new) 1478 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1479 EVENTHANDLER_INVOKE(group_change_event, groupname); 1480 1481 return (0); 1482 } 1483 1484 /* 1485 * Remove a group from an interface 1486 */ 1487 int 1488 if_delgroup(struct ifnet *ifp, const char *groupname) 1489 { 1490 struct ifg_list *ifgl; 1491 struct ifg_member *ifgm; 1492 int freeifgl; 1493 1494 IFNET_WLOCK(); 1495 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1496 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1497 break; 1498 if (ifgl == NULL) { 1499 IFNET_WUNLOCK(); 1500 return (ENOENT); 1501 } 1502 1503 freeifgl = 0; 1504 IF_ADDR_WLOCK(ifp); 1505 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1506 IF_ADDR_WUNLOCK(ifp); 1507 1508 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1509 if (ifgm->ifgm_ifp == ifp) 1510 break; 1511 1512 if (ifgm != NULL) 1513 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1514 1515 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1516 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1517 freeifgl = 1; 1518 } 1519 IFNET_WUNLOCK(); 1520 1521 epoch_wait_preempt(net_epoch_preempt); 1522 if (freeifgl) { 1523 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1524 free(ifgl->ifgl_group, M_TEMP); 1525 } 1526 free(ifgm, M_TEMP); 1527 free(ifgl, M_TEMP); 1528 1529 EVENTHANDLER_INVOKE(group_change_event, groupname); 1530 1531 return (0); 1532 } 1533 1534 /* 1535 * Remove an interface from all groups 1536 */ 1537 static void 1538 if_delgroups(struct ifnet *ifp) 1539 { 1540 struct ifg_list *ifgl; 1541 struct ifg_member *ifgm; 1542 char groupname[IFNAMSIZ]; 1543 int ifglfree; 1544 1545 IFNET_WLOCK(); 1546 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1547 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1548 1549 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1550 1551 IF_ADDR_WLOCK(ifp); 1552 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1553 IF_ADDR_WUNLOCK(ifp); 1554 1555 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1556 if (ifgm->ifgm_ifp == ifp) 1557 break; 1558 1559 if (ifgm != NULL) 1560 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1561 ifgm_next); 1562 ifglfree = 0; 1563 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1564 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1565 ifglfree = 1; 1566 } 1567 1568 IFNET_WUNLOCK(); 1569 epoch_wait_preempt(net_epoch_preempt); 1570 free(ifgm, M_TEMP); 1571 if (ifglfree) { 1572 EVENTHANDLER_INVOKE(group_detach_event, 1573 ifgl->ifgl_group); 1574 free(ifgl->ifgl_group, M_TEMP); 1575 } 1576 EVENTHANDLER_INVOKE(group_change_event, groupname); 1577 1578 IFNET_WLOCK(); 1579 } 1580 IFNET_WUNLOCK(); 1581 } 1582 1583 static char * 1584 ifgr_group_get(void *ifgrp) 1585 { 1586 union ifgroupreq_union *ifgrup; 1587 1588 ifgrup = ifgrp; 1589 #ifdef COMPAT_FREEBSD32 1590 if (SV_CURPROC_FLAG(SV_ILP32)) 1591 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1592 #endif 1593 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1594 } 1595 1596 static struct ifg_req * 1597 ifgr_groups_get(void *ifgrp) 1598 { 1599 union ifgroupreq_union *ifgrup; 1600 1601 ifgrup = ifgrp; 1602 #ifdef COMPAT_FREEBSD32 1603 if (SV_CURPROC_FLAG(SV_ILP32)) 1604 return ((struct ifg_req *)(uintptr_t) 1605 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1606 #endif 1607 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1608 } 1609 1610 /* 1611 * Stores all groups from an interface in memory pointed to by ifgr. 1612 */ 1613 static int 1614 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1615 { 1616 int len, error; 1617 struct ifg_list *ifgl; 1618 struct ifg_req ifgrq, *ifgp; 1619 1620 if (ifgr->ifgr_len == 0) { 1621 IF_ADDR_RLOCK(ifp); 1622 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1623 ifgr->ifgr_len += sizeof(struct ifg_req); 1624 IF_ADDR_RUNLOCK(ifp); 1625 return (0); 1626 } 1627 1628 len = ifgr->ifgr_len; 1629 ifgp = ifgr_groups_get(ifgr); 1630 /* XXX: wire */ 1631 IF_ADDR_RLOCK(ifp); 1632 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1633 if (len < sizeof(ifgrq)) { 1634 IF_ADDR_RUNLOCK(ifp); 1635 return (EINVAL); 1636 } 1637 bzero(&ifgrq, sizeof ifgrq); 1638 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1639 sizeof(ifgrq.ifgrq_group)); 1640 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1641 IF_ADDR_RUNLOCK(ifp); 1642 return (error); 1643 } 1644 len -= sizeof(ifgrq); 1645 ifgp++; 1646 } 1647 IF_ADDR_RUNLOCK(ifp); 1648 1649 return (0); 1650 } 1651 1652 /* 1653 * Stores all members of a group in memory pointed to by igfr 1654 */ 1655 static int 1656 if_getgroupmembers(struct ifgroupreq *ifgr) 1657 { 1658 struct ifg_group *ifg; 1659 struct ifg_member *ifgm; 1660 struct ifg_req ifgrq, *ifgp; 1661 int len, error; 1662 1663 IFNET_RLOCK(); 1664 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1665 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1666 break; 1667 if (ifg == NULL) { 1668 IFNET_RUNLOCK(); 1669 return (ENOENT); 1670 } 1671 1672 if (ifgr->ifgr_len == 0) { 1673 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1674 ifgr->ifgr_len += sizeof(ifgrq); 1675 IFNET_RUNLOCK(); 1676 return (0); 1677 } 1678 1679 len = ifgr->ifgr_len; 1680 ifgp = ifgr_groups_get(ifgr); 1681 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1682 if (len < sizeof(ifgrq)) { 1683 IFNET_RUNLOCK(); 1684 return (EINVAL); 1685 } 1686 bzero(&ifgrq, sizeof ifgrq); 1687 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1688 sizeof(ifgrq.ifgrq_member)); 1689 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1690 IFNET_RUNLOCK(); 1691 return (error); 1692 } 1693 len -= sizeof(ifgrq); 1694 ifgp++; 1695 } 1696 IFNET_RUNLOCK(); 1697 1698 return (0); 1699 } 1700 1701 /* 1702 * Return counter values from counter(9)s stored in ifnet. 1703 */ 1704 uint64_t 1705 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1706 { 1707 1708 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1709 1710 return (counter_u64_fetch(ifp->if_counters[cnt])); 1711 } 1712 1713 /* 1714 * Increase an ifnet counter. Usually used for counters shared 1715 * between the stack and a driver, but function supports them all. 1716 */ 1717 void 1718 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1719 { 1720 1721 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1722 1723 counter_u64_add(ifp->if_counters[cnt], inc); 1724 } 1725 1726 /* 1727 * Copy data from ifnet to userland API structure if_data. 1728 */ 1729 void 1730 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1731 { 1732 1733 ifd->ifi_type = ifp->if_type; 1734 ifd->ifi_physical = 0; 1735 ifd->ifi_addrlen = ifp->if_addrlen; 1736 ifd->ifi_hdrlen = ifp->if_hdrlen; 1737 ifd->ifi_link_state = ifp->if_link_state; 1738 ifd->ifi_vhid = 0; 1739 ifd->ifi_datalen = sizeof(struct if_data); 1740 ifd->ifi_mtu = ifp->if_mtu; 1741 ifd->ifi_metric = ifp->if_metric; 1742 ifd->ifi_baudrate = ifp->if_baudrate; 1743 ifd->ifi_hwassist = ifp->if_hwassist; 1744 ifd->ifi_epoch = ifp->if_epoch; 1745 ifd->ifi_lastchange = ifp->if_lastchange; 1746 1747 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1748 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1749 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1750 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1751 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1752 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1753 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1754 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1755 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1756 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1757 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1758 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1759 } 1760 1761 /* 1762 * Wrapper functions for struct ifnet address list locking macros. These are 1763 * used by kernel modules to avoid encoding programming interface or binary 1764 * interface assumptions that may be violated when kernel-internal locking 1765 * approaches change. 1766 */ 1767 void 1768 if_addr_rlock(struct ifnet *ifp) 1769 { 1770 1771 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1772 } 1773 1774 void 1775 if_addr_runlock(struct ifnet *ifp) 1776 { 1777 1778 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1779 } 1780 1781 void 1782 if_maddr_rlock(if_t ifp) 1783 { 1784 1785 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1786 } 1787 1788 void 1789 if_maddr_runlock(if_t ifp) 1790 { 1791 1792 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1793 } 1794 1795 /* 1796 * Initialization, destruction and refcounting functions for ifaddrs. 1797 */ 1798 struct ifaddr * 1799 ifa_alloc(size_t size, int flags) 1800 { 1801 struct ifaddr *ifa; 1802 1803 KASSERT(size >= sizeof(struct ifaddr), 1804 ("%s: invalid size %zu", __func__, size)); 1805 1806 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1807 if (ifa == NULL) 1808 return (NULL); 1809 1810 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1811 goto fail; 1812 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1813 goto fail; 1814 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1815 goto fail; 1816 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1817 goto fail; 1818 1819 refcount_init(&ifa->ifa_refcnt, 1); 1820 1821 return (ifa); 1822 1823 fail: 1824 /* free(NULL) is okay */ 1825 counter_u64_free(ifa->ifa_opackets); 1826 counter_u64_free(ifa->ifa_ipackets); 1827 counter_u64_free(ifa->ifa_obytes); 1828 counter_u64_free(ifa->ifa_ibytes); 1829 free(ifa, M_IFADDR); 1830 1831 return (NULL); 1832 } 1833 1834 void 1835 ifa_ref(struct ifaddr *ifa) 1836 { 1837 1838 refcount_acquire(&ifa->ifa_refcnt); 1839 } 1840 1841 static void 1842 ifa_destroy(epoch_context_t ctx) 1843 { 1844 struct ifaddr *ifa; 1845 1846 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1847 counter_u64_free(ifa->ifa_opackets); 1848 counter_u64_free(ifa->ifa_ipackets); 1849 counter_u64_free(ifa->ifa_obytes); 1850 counter_u64_free(ifa->ifa_ibytes); 1851 free(ifa, M_IFADDR); 1852 } 1853 1854 void 1855 ifa_free(struct ifaddr *ifa) 1856 { 1857 1858 if (refcount_release(&ifa->ifa_refcnt)) 1859 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1860 } 1861 1862 1863 static int 1864 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1865 struct sockaddr *ia) 1866 { 1867 int error; 1868 struct rt_addrinfo info; 1869 struct sockaddr_dl null_sdl; 1870 struct ifnet *ifp; 1871 1872 ifp = ifa->ifa_ifp; 1873 1874 bzero(&info, sizeof(info)); 1875 if (cmd != RTM_DELETE) 1876 info.rti_ifp = V_loif; 1877 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1878 info.rti_info[RTAX_DST] = ia; 1879 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1880 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1881 1882 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1883 1884 if (error != 0 && 1885 !(cmd == RTM_ADD && error == EEXIST) && 1886 !(cmd == RTM_DELETE && error == ENOENT)) 1887 if_printf(ifp, "%s failed: %d\n", otype, error); 1888 1889 return (error); 1890 } 1891 1892 int 1893 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1894 { 1895 1896 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1897 } 1898 1899 int 1900 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1901 { 1902 1903 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1904 } 1905 1906 int 1907 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1908 { 1909 1910 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1911 } 1912 1913 /* 1914 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1915 * structs used to represent other address families, it is necessary 1916 * to perform a different comparison. 1917 */ 1918 1919 #define sa_dl_equal(a1, a2) \ 1920 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1921 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1922 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1923 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1924 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1925 1926 /* 1927 * Locate an interface based on a complete address. 1928 */ 1929 /*ARGSUSED*/ 1930 struct ifaddr * 1931 ifa_ifwithaddr(const struct sockaddr *addr) 1932 { 1933 struct ifnet *ifp; 1934 struct ifaddr *ifa; 1935 1936 MPASS(in_epoch(net_epoch_preempt)); 1937 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1938 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1939 if (ifa->ifa_addr->sa_family != addr->sa_family) 1940 continue; 1941 if (sa_equal(addr, ifa->ifa_addr)) { 1942 goto done; 1943 } 1944 /* IP6 doesn't have broadcast */ 1945 if ((ifp->if_flags & IFF_BROADCAST) && 1946 ifa->ifa_broadaddr && 1947 ifa->ifa_broadaddr->sa_len != 0 && 1948 sa_equal(ifa->ifa_broadaddr, addr)) { 1949 goto done; 1950 } 1951 } 1952 } 1953 ifa = NULL; 1954 done: 1955 return (ifa); 1956 } 1957 1958 int 1959 ifa_ifwithaddr_check(const struct sockaddr *addr) 1960 { 1961 int rc; 1962 1963 NET_EPOCH_ENTER(); 1964 rc = (ifa_ifwithaddr(addr) != NULL); 1965 NET_EPOCH_EXIT(); 1966 return (rc); 1967 } 1968 1969 /* 1970 * Locate an interface based on the broadcast address. 1971 */ 1972 /* ARGSUSED */ 1973 struct ifaddr * 1974 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1975 { 1976 struct ifnet *ifp; 1977 struct ifaddr *ifa; 1978 1979 MPASS(in_epoch(net_epoch_preempt)); 1980 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1981 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1982 continue; 1983 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1984 if (ifa->ifa_addr->sa_family != addr->sa_family) 1985 continue; 1986 if ((ifp->if_flags & IFF_BROADCAST) && 1987 ifa->ifa_broadaddr && 1988 ifa->ifa_broadaddr->sa_len != 0 && 1989 sa_equal(ifa->ifa_broadaddr, addr)) { 1990 goto done; 1991 } 1992 } 1993 } 1994 ifa = NULL; 1995 done: 1996 return (ifa); 1997 } 1998 1999 /* 2000 * Locate the point to point interface with a given destination address. 2001 */ 2002 /*ARGSUSED*/ 2003 struct ifaddr * 2004 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2005 { 2006 struct ifnet *ifp; 2007 struct ifaddr *ifa; 2008 2009 MPASS(in_epoch(net_epoch_preempt)); 2010 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2011 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2012 continue; 2013 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2014 continue; 2015 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2016 if (ifa->ifa_addr->sa_family != addr->sa_family) 2017 continue; 2018 if (ifa->ifa_dstaddr != NULL && 2019 sa_equal(addr, ifa->ifa_dstaddr)) { 2020 goto done; 2021 } 2022 } 2023 } 2024 ifa = NULL; 2025 done: 2026 return (ifa); 2027 } 2028 2029 /* 2030 * Find an interface on a specific network. If many, choice 2031 * is most specific found. 2032 */ 2033 struct ifaddr * 2034 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2035 { 2036 struct ifnet *ifp; 2037 struct ifaddr *ifa; 2038 struct ifaddr *ifa_maybe = NULL; 2039 u_int af = addr->sa_family; 2040 const char *addr_data = addr->sa_data, *cplim; 2041 2042 MPASS(in_epoch(net_epoch_preempt)); 2043 /* 2044 * AF_LINK addresses can be looked up directly by their index number, 2045 * so do that if we can. 2046 */ 2047 if (af == AF_LINK) { 2048 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2049 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2050 return (ifaddr_byindex(sdl->sdl_index)); 2051 } 2052 2053 /* 2054 * Scan though each interface, looking for ones that have addresses 2055 * in this address family and the requested fib. Maintain a reference 2056 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 2057 * kept it stable when we move onto the next interface. 2058 */ 2059 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2060 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2061 continue; 2062 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2063 const char *cp, *cp2, *cp3; 2064 2065 if (ifa->ifa_addr->sa_family != af) 2066 next: continue; 2067 if (af == AF_INET && 2068 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2069 /* 2070 * This is a bit broken as it doesn't 2071 * take into account that the remote end may 2072 * be a single node in the network we are 2073 * looking for. 2074 * The trouble is that we don't know the 2075 * netmask for the remote end. 2076 */ 2077 if (ifa->ifa_dstaddr != NULL && 2078 sa_equal(addr, ifa->ifa_dstaddr)) { 2079 goto done; 2080 } 2081 } else { 2082 /* 2083 * Scan all the bits in the ifa's address. 2084 * If a bit dissagrees with what we are 2085 * looking for, mask it with the netmask 2086 * to see if it really matters. 2087 * (A byte at a time) 2088 */ 2089 if (ifa->ifa_netmask == 0) 2090 continue; 2091 cp = addr_data; 2092 cp2 = ifa->ifa_addr->sa_data; 2093 cp3 = ifa->ifa_netmask->sa_data; 2094 cplim = ifa->ifa_netmask->sa_len 2095 + (char *)ifa->ifa_netmask; 2096 while (cp3 < cplim) 2097 if ((*cp++ ^ *cp2++) & *cp3++) 2098 goto next; /* next address! */ 2099 /* 2100 * If the netmask of what we just found 2101 * is more specific than what we had before 2102 * (if we had one), or if the virtual status 2103 * of new prefix is better than of the old one, 2104 * then remember the new one before continuing 2105 * to search for an even better one. 2106 */ 2107 if (ifa_maybe == NULL || 2108 ifa_preferred(ifa_maybe, ifa) || 2109 rn_refines((caddr_t)ifa->ifa_netmask, 2110 (caddr_t)ifa_maybe->ifa_netmask)) { 2111 ifa_maybe = ifa; 2112 } 2113 } 2114 } 2115 } 2116 ifa = ifa_maybe; 2117 ifa_maybe = NULL; 2118 done: 2119 return (ifa); 2120 } 2121 2122 /* 2123 * Find an interface address specific to an interface best matching 2124 * a given address. 2125 */ 2126 struct ifaddr * 2127 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2128 { 2129 struct ifaddr *ifa; 2130 const char *cp, *cp2, *cp3; 2131 char *cplim; 2132 struct ifaddr *ifa_maybe = NULL; 2133 u_int af = addr->sa_family; 2134 2135 if (af >= AF_MAX) 2136 return (NULL); 2137 2138 MPASS(in_epoch(net_epoch_preempt)); 2139 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2140 if (ifa->ifa_addr->sa_family != af) 2141 continue; 2142 if (ifa_maybe == NULL) 2143 ifa_maybe = ifa; 2144 if (ifa->ifa_netmask == 0) { 2145 if (sa_equal(addr, ifa->ifa_addr) || 2146 (ifa->ifa_dstaddr && 2147 sa_equal(addr, ifa->ifa_dstaddr))) 2148 goto done; 2149 continue; 2150 } 2151 if (ifp->if_flags & IFF_POINTOPOINT) { 2152 if (sa_equal(addr, ifa->ifa_dstaddr)) 2153 goto done; 2154 } else { 2155 cp = addr->sa_data; 2156 cp2 = ifa->ifa_addr->sa_data; 2157 cp3 = ifa->ifa_netmask->sa_data; 2158 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2159 for (; cp3 < cplim; cp3++) 2160 if ((*cp++ ^ *cp2++) & *cp3) 2161 break; 2162 if (cp3 == cplim) 2163 goto done; 2164 } 2165 } 2166 ifa = ifa_maybe; 2167 done: 2168 return (ifa); 2169 } 2170 2171 /* 2172 * See whether new ifa is better than current one: 2173 * 1) A non-virtual one is preferred over virtual. 2174 * 2) A virtual in master state preferred over any other state. 2175 * 2176 * Used in several address selecting functions. 2177 */ 2178 int 2179 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2180 { 2181 2182 return (cur->ifa_carp && (!next->ifa_carp || 2183 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2184 } 2185 2186 #include <net/if_llatbl.h> 2187 2188 /* 2189 * Default action when installing a route with a Link Level gateway. 2190 * Lookup an appropriate real ifa to point to. 2191 * This should be moved to /sys/net/link.c eventually. 2192 */ 2193 static void 2194 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 2195 { 2196 struct ifaddr *ifa, *oifa; 2197 struct sockaddr *dst; 2198 struct ifnet *ifp; 2199 2200 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 2201 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_key(rt)) == NULL)) 2202 return; 2203 NET_EPOCH_ENTER(); 2204 ifa = ifaof_ifpforaddr(dst, ifp); 2205 if (ifa) { 2206 oifa = rt->rt_ifa; 2207 if (oifa != ifa) { 2208 ifa_free(oifa); 2209 ifa_ref(ifa); 2210 } 2211 rt->rt_ifa = ifa; 2212 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2213 ifa->ifa_rtrequest(cmd, rt, info); 2214 } 2215 NET_EPOCH_EXIT(); 2216 } 2217 2218 struct sockaddr_dl * 2219 link_alloc_sdl(size_t size, int flags) 2220 { 2221 2222 return (malloc(size, M_TEMP, flags)); 2223 } 2224 2225 void 2226 link_free_sdl(struct sockaddr *sa) 2227 { 2228 free(sa, M_TEMP); 2229 } 2230 2231 /* 2232 * Fills in given sdl with interface basic info. 2233 * Returns pointer to filled sdl. 2234 */ 2235 struct sockaddr_dl * 2236 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2237 { 2238 struct sockaddr_dl *sdl; 2239 2240 sdl = (struct sockaddr_dl *)paddr; 2241 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2242 sdl->sdl_len = sizeof(struct sockaddr_dl); 2243 sdl->sdl_family = AF_LINK; 2244 sdl->sdl_index = ifp->if_index; 2245 sdl->sdl_type = iftype; 2246 2247 return (sdl); 2248 } 2249 2250 /* 2251 * Mark an interface down and notify protocols of 2252 * the transition. 2253 */ 2254 static void 2255 if_unroute(struct ifnet *ifp, int flag, int fam) 2256 { 2257 struct ifaddr *ifa; 2258 2259 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2260 2261 ifp->if_flags &= ~flag; 2262 getmicrotime(&ifp->if_lastchange); 2263 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2264 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2265 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2266 ifp->if_qflush(ifp); 2267 2268 if (ifp->if_carp) 2269 (*carp_linkstate_p)(ifp); 2270 rt_ifmsg(ifp); 2271 } 2272 2273 /* 2274 * Mark an interface up and notify protocols of 2275 * the transition. 2276 */ 2277 static void 2278 if_route(struct ifnet *ifp, int flag, int fam) 2279 { 2280 struct ifaddr *ifa; 2281 2282 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2283 2284 ifp->if_flags |= flag; 2285 getmicrotime(&ifp->if_lastchange); 2286 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2287 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2288 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2289 if (ifp->if_carp) 2290 (*carp_linkstate_p)(ifp); 2291 rt_ifmsg(ifp); 2292 #ifdef INET6 2293 in6_if_up(ifp); 2294 #endif 2295 } 2296 2297 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2298 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2299 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2300 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2301 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2302 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2303 int (*vlan_setcookie_p)(struct ifnet *, void *); 2304 void *(*vlan_cookie_p)(struct ifnet *); 2305 2306 /* 2307 * Handle a change in the interface link state. To avoid LORs 2308 * between driver lock and upper layer locks, as well as possible 2309 * recursions, we post event to taskqueue, and all job 2310 * is done in static do_link_state_change(). 2311 */ 2312 void 2313 if_link_state_change(struct ifnet *ifp, int link_state) 2314 { 2315 /* Return if state hasn't changed. */ 2316 if (ifp->if_link_state == link_state) 2317 return; 2318 2319 ifp->if_link_state = link_state; 2320 2321 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2322 } 2323 2324 static void 2325 do_link_state_change(void *arg, int pending) 2326 { 2327 struct ifnet *ifp = (struct ifnet *)arg; 2328 int link_state = ifp->if_link_state; 2329 CURVNET_SET(ifp->if_vnet); 2330 2331 /* Notify that the link state has changed. */ 2332 rt_ifmsg(ifp); 2333 if (ifp->if_vlantrunk != NULL) 2334 (*vlan_link_state_p)(ifp); 2335 2336 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2337 ifp->if_l2com != NULL) 2338 (*ng_ether_link_state_p)(ifp, link_state); 2339 if (ifp->if_carp) 2340 (*carp_linkstate_p)(ifp); 2341 if (ifp->if_bridge) 2342 ifp->if_bridge_linkstate(ifp); 2343 if (ifp->if_lagg) 2344 (*lagg_linkstate_p)(ifp, link_state); 2345 2346 if (IS_DEFAULT_VNET(curvnet)) 2347 devctl_notify("IFNET", ifp->if_xname, 2348 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2349 NULL); 2350 if (pending > 1) 2351 if_printf(ifp, "%d link states coalesced\n", pending); 2352 if (log_link_state_change) 2353 if_printf(ifp, "link state changed to %s\n", 2354 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2355 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2356 CURVNET_RESTORE(); 2357 } 2358 2359 /* 2360 * Mark an interface down and notify protocols of 2361 * the transition. 2362 */ 2363 void 2364 if_down(struct ifnet *ifp) 2365 { 2366 2367 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2368 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2369 } 2370 2371 /* 2372 * Mark an interface up and notify protocols of 2373 * the transition. 2374 */ 2375 void 2376 if_up(struct ifnet *ifp) 2377 { 2378 2379 if_route(ifp, IFF_UP, AF_UNSPEC); 2380 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2381 } 2382 2383 /* 2384 * Flush an interface queue. 2385 */ 2386 void 2387 if_qflush(struct ifnet *ifp) 2388 { 2389 struct mbuf *m, *n; 2390 struct ifaltq *ifq; 2391 2392 ifq = &ifp->if_snd; 2393 IFQ_LOCK(ifq); 2394 #ifdef ALTQ 2395 if (ALTQ_IS_ENABLED(ifq)) 2396 ALTQ_PURGE(ifq); 2397 #endif 2398 n = ifq->ifq_head; 2399 while ((m = n) != NULL) { 2400 n = m->m_nextpkt; 2401 m_freem(m); 2402 } 2403 ifq->ifq_head = 0; 2404 ifq->ifq_tail = 0; 2405 ifq->ifq_len = 0; 2406 IFQ_UNLOCK(ifq); 2407 } 2408 2409 /* 2410 * Map interface name to interface structure pointer, with or without 2411 * returning a reference. 2412 */ 2413 struct ifnet * 2414 ifunit_ref(const char *name) 2415 { 2416 struct ifnet *ifp; 2417 2418 IFNET_RLOCK_NOSLEEP(); 2419 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2420 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2421 !(ifp->if_flags & IFF_DYING)) 2422 break; 2423 } 2424 if (ifp != NULL) 2425 if_ref(ifp); 2426 IFNET_RUNLOCK_NOSLEEP(); 2427 return (ifp); 2428 } 2429 2430 struct ifnet * 2431 ifunit(const char *name) 2432 { 2433 struct ifnet *ifp; 2434 2435 IFNET_RLOCK_NOSLEEP(); 2436 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2437 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2438 break; 2439 } 2440 IFNET_RUNLOCK_NOSLEEP(); 2441 return (ifp); 2442 } 2443 2444 static void * 2445 ifr_buffer_get_buffer(void *data) 2446 { 2447 union ifreq_union *ifrup; 2448 2449 ifrup = data; 2450 #ifdef COMPAT_FREEBSD32 2451 if (SV_CURPROC_FLAG(SV_ILP32)) 2452 return ((void *)(uintptr_t) 2453 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2454 #endif 2455 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2456 } 2457 2458 static void 2459 ifr_buffer_set_buffer_null(void *data) 2460 { 2461 union ifreq_union *ifrup; 2462 2463 ifrup = data; 2464 #ifdef COMPAT_FREEBSD32 2465 if (SV_CURPROC_FLAG(SV_ILP32)) 2466 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2467 else 2468 #endif 2469 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2470 } 2471 2472 static size_t 2473 ifr_buffer_get_length(void *data) 2474 { 2475 union ifreq_union *ifrup; 2476 2477 ifrup = data; 2478 #ifdef COMPAT_FREEBSD32 2479 if (SV_CURPROC_FLAG(SV_ILP32)) 2480 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2481 #endif 2482 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2483 } 2484 2485 static void 2486 ifr_buffer_set_length(void *data, size_t len) 2487 { 2488 union ifreq_union *ifrup; 2489 2490 ifrup = data; 2491 #ifdef COMPAT_FREEBSD32 2492 if (SV_CURPROC_FLAG(SV_ILP32)) 2493 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2494 else 2495 #endif 2496 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2497 } 2498 2499 void * 2500 ifr_data_get_ptr(void *ifrp) 2501 { 2502 union ifreq_union *ifrup; 2503 2504 ifrup = ifrp; 2505 #ifdef COMPAT_FREEBSD32 2506 if (SV_CURPROC_FLAG(SV_ILP32)) 2507 return ((void *)(uintptr_t) 2508 ifrup->ifr32.ifr_ifru.ifru_data); 2509 #endif 2510 return (ifrup->ifr.ifr_ifru.ifru_data); 2511 } 2512 2513 /* 2514 * Hardware specific interface ioctls. 2515 */ 2516 int 2517 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2518 { 2519 struct ifreq *ifr; 2520 int error = 0, do_ifup = 0; 2521 int new_flags, temp_flags; 2522 size_t namelen, onamelen; 2523 size_t descrlen; 2524 char *descrbuf, *odescrbuf; 2525 char new_name[IFNAMSIZ]; 2526 struct ifaddr *ifa; 2527 struct sockaddr_dl *sdl; 2528 2529 ifr = (struct ifreq *)data; 2530 switch (cmd) { 2531 case SIOCGIFINDEX: 2532 ifr->ifr_index = ifp->if_index; 2533 break; 2534 2535 case SIOCGIFFLAGS: 2536 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2537 ifr->ifr_flags = temp_flags & 0xffff; 2538 ifr->ifr_flagshigh = temp_flags >> 16; 2539 break; 2540 2541 case SIOCGIFCAP: 2542 ifr->ifr_reqcap = ifp->if_capabilities; 2543 ifr->ifr_curcap = ifp->if_capenable; 2544 break; 2545 2546 #ifdef MAC 2547 case SIOCGIFMAC: 2548 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2549 break; 2550 #endif 2551 2552 case SIOCGIFMETRIC: 2553 ifr->ifr_metric = ifp->if_metric; 2554 break; 2555 2556 case SIOCGIFMTU: 2557 ifr->ifr_mtu = ifp->if_mtu; 2558 break; 2559 2560 case SIOCGIFPHYS: 2561 /* XXXGL: did this ever worked? */ 2562 ifr->ifr_phys = 0; 2563 break; 2564 2565 case SIOCGIFDESCR: 2566 error = 0; 2567 sx_slock(&ifdescr_sx); 2568 if (ifp->if_description == NULL) 2569 error = ENOMSG; 2570 else { 2571 /* space for terminating nul */ 2572 descrlen = strlen(ifp->if_description) + 1; 2573 if (ifr_buffer_get_length(ifr) < descrlen) 2574 ifr_buffer_set_buffer_null(ifr); 2575 else 2576 error = copyout(ifp->if_description, 2577 ifr_buffer_get_buffer(ifr), descrlen); 2578 ifr_buffer_set_length(ifr, descrlen); 2579 } 2580 sx_sunlock(&ifdescr_sx); 2581 break; 2582 2583 case SIOCSIFDESCR: 2584 error = priv_check(td, PRIV_NET_SETIFDESCR); 2585 if (error) 2586 return (error); 2587 2588 /* 2589 * Copy only (length-1) bytes to make sure that 2590 * if_description is always nul terminated. The 2591 * length parameter is supposed to count the 2592 * terminating nul in. 2593 */ 2594 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2595 return (ENAMETOOLONG); 2596 else if (ifr_buffer_get_length(ifr) == 0) 2597 descrbuf = NULL; 2598 else { 2599 descrbuf = malloc(ifr_buffer_get_length(ifr), 2600 M_IFDESCR, M_WAITOK | M_ZERO); 2601 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2602 ifr_buffer_get_length(ifr) - 1); 2603 if (error) { 2604 free(descrbuf, M_IFDESCR); 2605 break; 2606 } 2607 } 2608 2609 sx_xlock(&ifdescr_sx); 2610 odescrbuf = ifp->if_description; 2611 ifp->if_description = descrbuf; 2612 sx_xunlock(&ifdescr_sx); 2613 2614 getmicrotime(&ifp->if_lastchange); 2615 free(odescrbuf, M_IFDESCR); 2616 break; 2617 2618 case SIOCGIFFIB: 2619 ifr->ifr_fib = ifp->if_fib; 2620 break; 2621 2622 case SIOCSIFFIB: 2623 error = priv_check(td, PRIV_NET_SETIFFIB); 2624 if (error) 2625 return (error); 2626 if (ifr->ifr_fib >= rt_numfibs) 2627 return (EINVAL); 2628 2629 ifp->if_fib = ifr->ifr_fib; 2630 break; 2631 2632 case SIOCSIFFLAGS: 2633 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2634 if (error) 2635 return (error); 2636 /* 2637 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2638 * check, so we don't need special handling here yet. 2639 */ 2640 new_flags = (ifr->ifr_flags & 0xffff) | 2641 (ifr->ifr_flagshigh << 16); 2642 if (ifp->if_flags & IFF_UP && 2643 (new_flags & IFF_UP) == 0) { 2644 if_down(ifp); 2645 } else if (new_flags & IFF_UP && 2646 (ifp->if_flags & IFF_UP) == 0) { 2647 do_ifup = 1; 2648 } 2649 /* See if permanently promiscuous mode bit is about to flip */ 2650 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2651 if (new_flags & IFF_PPROMISC) 2652 ifp->if_flags |= IFF_PROMISC; 2653 else if (ifp->if_pcount == 0) 2654 ifp->if_flags &= ~IFF_PROMISC; 2655 if (log_promisc_mode_change) 2656 if_printf(ifp, "permanently promiscuous mode %s\n", 2657 ((new_flags & IFF_PPROMISC) ? 2658 "enabled" : "disabled")); 2659 } 2660 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2661 (new_flags &~ IFF_CANTCHANGE); 2662 if (ifp->if_ioctl) { 2663 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2664 } 2665 if (do_ifup) 2666 if_up(ifp); 2667 getmicrotime(&ifp->if_lastchange); 2668 break; 2669 2670 case SIOCSIFCAP: 2671 error = priv_check(td, PRIV_NET_SETIFCAP); 2672 if (error) 2673 return (error); 2674 if (ifp->if_ioctl == NULL) 2675 return (EOPNOTSUPP); 2676 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2677 return (EINVAL); 2678 error = (*ifp->if_ioctl)(ifp, cmd, data); 2679 if (error == 0) 2680 getmicrotime(&ifp->if_lastchange); 2681 break; 2682 2683 #ifdef MAC 2684 case SIOCSIFMAC: 2685 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2686 break; 2687 #endif 2688 2689 case SIOCSIFNAME: 2690 error = priv_check(td, PRIV_NET_SETIFNAME); 2691 if (error) 2692 return (error); 2693 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2694 NULL); 2695 if (error != 0) 2696 return (error); 2697 if (new_name[0] == '\0') 2698 return (EINVAL); 2699 if (new_name[IFNAMSIZ-1] != '\0') { 2700 new_name[IFNAMSIZ-1] = '\0'; 2701 if (strlen(new_name) == IFNAMSIZ-1) 2702 return (EINVAL); 2703 } 2704 if (ifunit(new_name) != NULL) 2705 return (EEXIST); 2706 2707 /* 2708 * XXX: Locking. Nothing else seems to lock if_flags, 2709 * and there are numerous other races with the 2710 * ifunit() checks not being atomic with namespace 2711 * changes (renames, vmoves, if_attach, etc). 2712 */ 2713 ifp->if_flags |= IFF_RENAMING; 2714 2715 /* Announce the departure of the interface. */ 2716 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2717 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2718 2719 if_printf(ifp, "changing name to '%s'\n", new_name); 2720 2721 IF_ADDR_WLOCK(ifp); 2722 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2723 ifa = ifp->if_addr; 2724 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2725 namelen = strlen(new_name); 2726 onamelen = sdl->sdl_nlen; 2727 /* 2728 * Move the address if needed. This is safe because we 2729 * allocate space for a name of length IFNAMSIZ when we 2730 * create this in if_attach(). 2731 */ 2732 if (namelen != onamelen) { 2733 bcopy(sdl->sdl_data + onamelen, 2734 sdl->sdl_data + namelen, sdl->sdl_alen); 2735 } 2736 bcopy(new_name, sdl->sdl_data, namelen); 2737 sdl->sdl_nlen = namelen; 2738 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2739 bzero(sdl->sdl_data, onamelen); 2740 while (namelen != 0) 2741 sdl->sdl_data[--namelen] = 0xff; 2742 IF_ADDR_WUNLOCK(ifp); 2743 2744 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2745 /* Announce the return of the interface. */ 2746 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2747 2748 ifp->if_flags &= ~IFF_RENAMING; 2749 break; 2750 2751 #ifdef VIMAGE 2752 case SIOCSIFVNET: 2753 error = priv_check(td, PRIV_NET_SETIFVNET); 2754 if (error) 2755 return (error); 2756 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2757 break; 2758 #endif 2759 2760 case SIOCSIFMETRIC: 2761 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2762 if (error) 2763 return (error); 2764 ifp->if_metric = ifr->ifr_metric; 2765 getmicrotime(&ifp->if_lastchange); 2766 break; 2767 2768 case SIOCSIFPHYS: 2769 error = priv_check(td, PRIV_NET_SETIFPHYS); 2770 if (error) 2771 return (error); 2772 if (ifp->if_ioctl == NULL) 2773 return (EOPNOTSUPP); 2774 error = (*ifp->if_ioctl)(ifp, cmd, data); 2775 if (error == 0) 2776 getmicrotime(&ifp->if_lastchange); 2777 break; 2778 2779 case SIOCSIFMTU: 2780 { 2781 u_long oldmtu = ifp->if_mtu; 2782 2783 error = priv_check(td, PRIV_NET_SETIFMTU); 2784 if (error) 2785 return (error); 2786 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2787 return (EINVAL); 2788 if (ifp->if_ioctl == NULL) 2789 return (EOPNOTSUPP); 2790 error = (*ifp->if_ioctl)(ifp, cmd, data); 2791 if (error == 0) { 2792 getmicrotime(&ifp->if_lastchange); 2793 rt_ifmsg(ifp); 2794 #ifdef INET 2795 NETDUMP_REINIT(ifp); 2796 #endif 2797 } 2798 /* 2799 * If the link MTU changed, do network layer specific procedure. 2800 */ 2801 if (ifp->if_mtu != oldmtu) { 2802 #ifdef INET6 2803 nd6_setmtu(ifp); 2804 #endif 2805 rt_updatemtu(ifp); 2806 } 2807 break; 2808 } 2809 2810 case SIOCADDMULTI: 2811 case SIOCDELMULTI: 2812 if (cmd == SIOCADDMULTI) 2813 error = priv_check(td, PRIV_NET_ADDMULTI); 2814 else 2815 error = priv_check(td, PRIV_NET_DELMULTI); 2816 if (error) 2817 return (error); 2818 2819 /* Don't allow group membership on non-multicast interfaces. */ 2820 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2821 return (EOPNOTSUPP); 2822 2823 /* Don't let users screw up protocols' entries. */ 2824 if (ifr->ifr_addr.sa_family != AF_LINK) 2825 return (EINVAL); 2826 2827 if (cmd == SIOCADDMULTI) { 2828 struct ifmultiaddr *ifma; 2829 2830 /* 2831 * Userland is only permitted to join groups once 2832 * via the if_addmulti() KPI, because it cannot hold 2833 * struct ifmultiaddr * between calls. It may also 2834 * lose a race while we check if the membership 2835 * already exists. 2836 */ 2837 IF_ADDR_RLOCK(ifp); 2838 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2839 IF_ADDR_RUNLOCK(ifp); 2840 if (ifma != NULL) 2841 error = EADDRINUSE; 2842 else 2843 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2844 } else { 2845 error = if_delmulti(ifp, &ifr->ifr_addr); 2846 } 2847 if (error == 0) 2848 getmicrotime(&ifp->if_lastchange); 2849 break; 2850 2851 case SIOCSIFPHYADDR: 2852 case SIOCDIFPHYADDR: 2853 #ifdef INET6 2854 case SIOCSIFPHYADDR_IN6: 2855 #endif 2856 case SIOCSIFMEDIA: 2857 case SIOCSIFGENERIC: 2858 error = priv_check(td, PRIV_NET_HWIOCTL); 2859 if (error) 2860 return (error); 2861 if (ifp->if_ioctl == NULL) 2862 return (EOPNOTSUPP); 2863 error = (*ifp->if_ioctl)(ifp, cmd, data); 2864 if (error == 0) 2865 getmicrotime(&ifp->if_lastchange); 2866 break; 2867 2868 case SIOCGIFSTATUS: 2869 case SIOCGIFPSRCADDR: 2870 case SIOCGIFPDSTADDR: 2871 case SIOCGIFMEDIA: 2872 case SIOCGIFXMEDIA: 2873 case SIOCGIFGENERIC: 2874 case SIOCGIFRSSKEY: 2875 case SIOCGIFRSSHASH: 2876 if (ifp->if_ioctl == NULL) 2877 return (EOPNOTSUPP); 2878 error = (*ifp->if_ioctl)(ifp, cmd, data); 2879 break; 2880 2881 case SIOCSIFLLADDR: 2882 error = priv_check(td, PRIV_NET_SETLLADDR); 2883 if (error) 2884 return (error); 2885 error = if_setlladdr(ifp, 2886 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2887 break; 2888 2889 case SIOCGHWADDR: 2890 error = if_gethwaddr(ifp, ifr); 2891 break; 2892 2893 CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2894 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2895 if (error) 2896 return (error); 2897 if ((error = if_addgroup(ifp, 2898 ifgr_group_get((struct ifgroupreq *)data)))) 2899 return (error); 2900 break; 2901 2902 CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2903 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2904 return (error); 2905 break; 2906 2907 CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2908 error = priv_check(td, PRIV_NET_DELIFGROUP); 2909 if (error) 2910 return (error); 2911 if ((error = if_delgroup(ifp, 2912 ifgr_group_get((struct ifgroupreq *)data)))) 2913 return (error); 2914 break; 2915 2916 default: 2917 error = ENOIOCTL; 2918 break; 2919 } 2920 return (error); 2921 } 2922 2923 #ifdef COMPAT_FREEBSD32 2924 struct ifconf32 { 2925 int32_t ifc_len; 2926 union { 2927 uint32_t ifcu_buf; 2928 uint32_t ifcu_req; 2929 } ifc_ifcu; 2930 }; 2931 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2932 #endif 2933 2934 #ifdef COMPAT_FREEBSD32 2935 static void 2936 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2937 { 2938 struct ifmediareq32 *ifmr32; 2939 2940 ifmr32 = (struct ifmediareq32 *)data; 2941 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2942 sizeof(ifmr->ifm_name)); 2943 ifmr->ifm_current = ifmr32->ifm_current; 2944 ifmr->ifm_mask = ifmr32->ifm_mask; 2945 ifmr->ifm_status = ifmr32->ifm_status; 2946 ifmr->ifm_active = ifmr32->ifm_active; 2947 ifmr->ifm_count = ifmr32->ifm_count; 2948 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2949 } 2950 2951 static void 2952 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2953 { 2954 struct ifmediareq32 *ifmr32; 2955 2956 ifmr32 = (struct ifmediareq32 *)data; 2957 ifmr32->ifm_current = ifmr->ifm_current; 2958 ifmr32->ifm_mask = ifmr->ifm_mask; 2959 ifmr32->ifm_status = ifmr->ifm_status; 2960 ifmr32->ifm_active = ifmr->ifm_active; 2961 ifmr32->ifm_count = ifmr->ifm_count; 2962 } 2963 #endif 2964 2965 /* 2966 * Interface ioctls. 2967 */ 2968 int 2969 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2970 { 2971 #ifdef COMPAT_FREEBSD32 2972 caddr_t saved_data = NULL; 2973 struct ifmediareq ifmr; 2974 struct ifmediareq *ifmrp; 2975 #endif 2976 struct ifnet *ifp; 2977 struct ifreq *ifr; 2978 int error; 2979 int oif_flags; 2980 #ifdef VIMAGE 2981 int shutdown; 2982 #endif 2983 2984 CURVNET_SET(so->so_vnet); 2985 #ifdef VIMAGE 2986 /* Make sure the VNET is stable. */ 2987 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 2988 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 2989 if (shutdown) { 2990 CURVNET_RESTORE(); 2991 return (EBUSY); 2992 } 2993 #endif 2994 2995 2996 switch (cmd) { 2997 case SIOCGIFCONF: 2998 error = ifconf(cmd, data); 2999 CURVNET_RESTORE(); 3000 return (error); 3001 3002 #ifdef COMPAT_FREEBSD32 3003 case SIOCGIFCONF32: 3004 { 3005 struct ifconf32 *ifc32; 3006 struct ifconf ifc; 3007 3008 ifc32 = (struct ifconf32 *)data; 3009 ifc.ifc_len = ifc32->ifc_len; 3010 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3011 3012 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3013 CURVNET_RESTORE(); 3014 if (error == 0) 3015 ifc32->ifc_len = ifc.ifc_len; 3016 return (error); 3017 } 3018 #endif 3019 } 3020 3021 #ifdef COMPAT_FREEBSD32 3022 ifmrp = NULL; 3023 switch (cmd) { 3024 case SIOCGIFMEDIA32: 3025 case SIOCGIFXMEDIA32: 3026 ifmrp = &ifmr; 3027 ifmr_init(ifmrp, data); 3028 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3029 saved_data = data; 3030 data = (caddr_t)ifmrp; 3031 } 3032 #endif 3033 3034 ifr = (struct ifreq *)data; 3035 switch (cmd) { 3036 #ifdef VIMAGE 3037 case SIOCSIFRVNET: 3038 error = priv_check(td, PRIV_NET_SETIFVNET); 3039 if (error == 0) 3040 error = if_vmove_reclaim(td, ifr->ifr_name, 3041 ifr->ifr_jid); 3042 goto out_noref; 3043 #endif 3044 case SIOCIFCREATE: 3045 case SIOCIFCREATE2: 3046 error = priv_check(td, PRIV_NET_IFCREATE); 3047 if (error == 0) 3048 error = if_clone_create(ifr->ifr_name, 3049 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3050 ifr_data_get_ptr(ifr) : NULL); 3051 goto out_noref; 3052 case SIOCIFDESTROY: 3053 error = priv_check(td, PRIV_NET_IFDESTROY); 3054 if (error == 0) 3055 error = if_clone_destroy(ifr->ifr_name); 3056 goto out_noref; 3057 3058 case SIOCIFGCLONERS: 3059 error = if_clone_list((struct if_clonereq *)data); 3060 goto out_noref; 3061 3062 CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3063 error = if_getgroupmembers((struct ifgroupreq *)data); 3064 goto out_noref; 3065 3066 #if defined(INET) || defined(INET6) 3067 case SIOCSVH: 3068 case SIOCGVH: 3069 if (carp_ioctl_p == NULL) 3070 error = EPROTONOSUPPORT; 3071 else 3072 error = (*carp_ioctl_p)(ifr, cmd, td); 3073 goto out_noref; 3074 #endif 3075 } 3076 3077 ifp = ifunit_ref(ifr->ifr_name); 3078 if (ifp == NULL) { 3079 error = ENXIO; 3080 goto out_noref; 3081 } 3082 3083 error = ifhwioctl(cmd, ifp, data, td); 3084 if (error != ENOIOCTL) 3085 goto out_ref; 3086 3087 oif_flags = ifp->if_flags; 3088 if (so->so_proto == NULL) { 3089 error = EOPNOTSUPP; 3090 goto out_ref; 3091 } 3092 3093 /* 3094 * Pass the request on to the socket control method, and if the 3095 * latter returns EOPNOTSUPP, directly to the interface. 3096 * 3097 * Make an exception for the legacy SIOCSIF* requests. Drivers 3098 * trust SIOCSIFADDR et al to come from an already privileged 3099 * layer, and do not perform any credentials checks or input 3100 * validation. 3101 */ 3102 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3103 ifp, td)); 3104 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3105 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3106 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3107 error = (*ifp->if_ioctl)(ifp, cmd, data); 3108 3109 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3110 #ifdef INET6 3111 if (ifp->if_flags & IFF_UP) 3112 in6_if_up(ifp); 3113 #endif 3114 } 3115 3116 out_ref: 3117 if_rele(ifp); 3118 out_noref: 3119 #ifdef COMPAT_FREEBSD32 3120 if (ifmrp != NULL) { 3121 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3122 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3123 cmd)); 3124 data = saved_data; 3125 ifmr_update(ifmrp, data); 3126 } 3127 #endif 3128 CURVNET_RESTORE(); 3129 return (error); 3130 } 3131 3132 /* 3133 * The code common to handling reference counted flags, 3134 * e.g., in ifpromisc() and if_allmulti(). 3135 * The "pflag" argument can specify a permanent mode flag to check, 3136 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3137 * 3138 * Only to be used on stack-owned flags, not driver-owned flags. 3139 */ 3140 static int 3141 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3142 { 3143 struct ifreq ifr; 3144 int error; 3145 int oldflags, oldcount; 3146 3147 /* Sanity checks to catch programming errors */ 3148 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3149 ("%s: setting driver-owned flag %d", __func__, flag)); 3150 3151 if (onswitch) 3152 KASSERT(*refcount >= 0, 3153 ("%s: increment negative refcount %d for flag %d", 3154 __func__, *refcount, flag)); 3155 else 3156 KASSERT(*refcount > 0, 3157 ("%s: decrement non-positive refcount %d for flag %d", 3158 __func__, *refcount, flag)); 3159 3160 /* In case this mode is permanent, just touch refcount */ 3161 if (ifp->if_flags & pflag) { 3162 *refcount += onswitch ? 1 : -1; 3163 return (0); 3164 } 3165 3166 /* Save ifnet parameters for if_ioctl() may fail */ 3167 oldcount = *refcount; 3168 oldflags = ifp->if_flags; 3169 3170 /* 3171 * See if we aren't the only and touching refcount is enough. 3172 * Actually toggle interface flag if we are the first or last. 3173 */ 3174 if (onswitch) { 3175 if ((*refcount)++) 3176 return (0); 3177 ifp->if_flags |= flag; 3178 } else { 3179 if (--(*refcount)) 3180 return (0); 3181 ifp->if_flags &= ~flag; 3182 } 3183 3184 /* Call down the driver since we've changed interface flags */ 3185 if (ifp->if_ioctl == NULL) { 3186 error = EOPNOTSUPP; 3187 goto recover; 3188 } 3189 ifr.ifr_flags = ifp->if_flags & 0xffff; 3190 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3191 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3192 if (error) 3193 goto recover; 3194 /* Notify userland that interface flags have changed */ 3195 rt_ifmsg(ifp); 3196 return (0); 3197 3198 recover: 3199 /* Recover after driver error */ 3200 *refcount = oldcount; 3201 ifp->if_flags = oldflags; 3202 return (error); 3203 } 3204 3205 /* 3206 * Set/clear promiscuous mode on interface ifp based on the truth value 3207 * of pswitch. The calls are reference counted so that only the first 3208 * "on" request actually has an effect, as does the final "off" request. 3209 * Results are undefined if the "off" and "on" requests are not matched. 3210 */ 3211 int 3212 ifpromisc(struct ifnet *ifp, int pswitch) 3213 { 3214 int error; 3215 int oldflags = ifp->if_flags; 3216 3217 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3218 &ifp->if_pcount, pswitch); 3219 /* If promiscuous mode status has changed, log a message */ 3220 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3221 log_promisc_mode_change) 3222 if_printf(ifp, "promiscuous mode %s\n", 3223 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3224 return (error); 3225 } 3226 3227 /* 3228 * Return interface configuration 3229 * of system. List may be used 3230 * in later ioctl's (above) to get 3231 * other information. 3232 */ 3233 /*ARGSUSED*/ 3234 static int 3235 ifconf(u_long cmd, caddr_t data) 3236 { 3237 struct ifconf *ifc = (struct ifconf *)data; 3238 struct ifnet *ifp; 3239 struct ifaddr *ifa; 3240 struct ifreq ifr; 3241 struct sbuf *sb; 3242 int error, full = 0, valid_len, max_len; 3243 3244 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3245 max_len = MAXPHYS - 1; 3246 3247 /* Prevent hostile input from being able to crash the system */ 3248 if (ifc->ifc_len <= 0) 3249 return (EINVAL); 3250 3251 again: 3252 if (ifc->ifc_len <= max_len) { 3253 max_len = ifc->ifc_len; 3254 full = 1; 3255 } 3256 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3257 max_len = 0; 3258 valid_len = 0; 3259 3260 IFNET_RLOCK(); 3261 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3262 int addrs; 3263 3264 /* 3265 * Zero the ifr to make sure we don't disclose the contents 3266 * of the stack. 3267 */ 3268 memset(&ifr, 0, sizeof(ifr)); 3269 3270 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3271 >= sizeof(ifr.ifr_name)) { 3272 sbuf_delete(sb); 3273 IFNET_RUNLOCK(); 3274 return (ENAMETOOLONG); 3275 } 3276 3277 addrs = 0; 3278 IF_ADDR_RLOCK(ifp); 3279 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3280 struct sockaddr *sa = ifa->ifa_addr; 3281 3282 if (prison_if(curthread->td_ucred, sa) != 0) 3283 continue; 3284 addrs++; 3285 if (sa->sa_len <= sizeof(*sa)) { 3286 if (sa->sa_len < sizeof(*sa)) { 3287 memset(&ifr.ifr_ifru.ifru_addr, 0, 3288 sizeof(ifr.ifr_ifru.ifru_addr)); 3289 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3290 sa->sa_len); 3291 } else 3292 ifr.ifr_ifru.ifru_addr = *sa; 3293 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3294 max_len += sizeof(ifr); 3295 } else { 3296 sbuf_bcat(sb, &ifr, 3297 offsetof(struct ifreq, ifr_addr)); 3298 max_len += offsetof(struct ifreq, ifr_addr); 3299 sbuf_bcat(sb, sa, sa->sa_len); 3300 max_len += sa->sa_len; 3301 } 3302 3303 if (sbuf_error(sb) == 0) 3304 valid_len = sbuf_len(sb); 3305 } 3306 IF_ADDR_RUNLOCK(ifp); 3307 if (addrs == 0) { 3308 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3309 max_len += sizeof(ifr); 3310 3311 if (sbuf_error(sb) == 0) 3312 valid_len = sbuf_len(sb); 3313 } 3314 } 3315 IFNET_RUNLOCK(); 3316 3317 /* 3318 * If we didn't allocate enough space (uncommon), try again. If 3319 * we have already allocated as much space as we are allowed, 3320 * return what we've got. 3321 */ 3322 if (valid_len != max_len && !full) { 3323 sbuf_delete(sb); 3324 goto again; 3325 } 3326 3327 ifc->ifc_len = valid_len; 3328 sbuf_finish(sb); 3329 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3330 sbuf_delete(sb); 3331 return (error); 3332 } 3333 3334 /* 3335 * Just like ifpromisc(), but for all-multicast-reception mode. 3336 */ 3337 int 3338 if_allmulti(struct ifnet *ifp, int onswitch) 3339 { 3340 3341 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3342 } 3343 3344 struct ifmultiaddr * 3345 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3346 { 3347 struct ifmultiaddr *ifma; 3348 3349 IF_ADDR_LOCK_ASSERT(ifp); 3350 3351 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3352 if (sa->sa_family == AF_LINK) { 3353 if (sa_dl_equal(ifma->ifma_addr, sa)) 3354 break; 3355 } else { 3356 if (sa_equal(ifma->ifma_addr, sa)) 3357 break; 3358 } 3359 } 3360 3361 return ifma; 3362 } 3363 3364 /* 3365 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3366 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3367 * the ifnet multicast address list here, so the caller must do that and 3368 * other setup work (such as notifying the device driver). The reference 3369 * count is initialized to 1. 3370 */ 3371 static struct ifmultiaddr * 3372 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3373 int mflags) 3374 { 3375 struct ifmultiaddr *ifma; 3376 struct sockaddr *dupsa; 3377 3378 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3379 M_ZERO); 3380 if (ifma == NULL) 3381 return (NULL); 3382 3383 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3384 if (dupsa == NULL) { 3385 free(ifma, M_IFMADDR); 3386 return (NULL); 3387 } 3388 bcopy(sa, dupsa, sa->sa_len); 3389 ifma->ifma_addr = dupsa; 3390 3391 ifma->ifma_ifp = ifp; 3392 ifma->ifma_refcount = 1; 3393 ifma->ifma_protospec = NULL; 3394 3395 if (llsa == NULL) { 3396 ifma->ifma_lladdr = NULL; 3397 return (ifma); 3398 } 3399 3400 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3401 if (dupsa == NULL) { 3402 free(ifma->ifma_addr, M_IFMADDR); 3403 free(ifma, M_IFMADDR); 3404 return (NULL); 3405 } 3406 bcopy(llsa, dupsa, llsa->sa_len); 3407 ifma->ifma_lladdr = dupsa; 3408 3409 return (ifma); 3410 } 3411 3412 /* 3413 * if_freemulti: free ifmultiaddr structure and possibly attached related 3414 * addresses. The caller is responsible for implementing reference 3415 * counting, notifying the driver, handling routing messages, and releasing 3416 * any dependent link layer state. 3417 */ 3418 #ifdef MCAST_VERBOSE 3419 extern void kdb_backtrace(void); 3420 #endif 3421 static void 3422 if_freemulti_internal(struct ifmultiaddr *ifma) 3423 { 3424 3425 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3426 ifma->ifma_refcount)); 3427 3428 if (ifma->ifma_lladdr != NULL) 3429 free(ifma->ifma_lladdr, M_IFMADDR); 3430 #ifdef MCAST_VERBOSE 3431 kdb_backtrace(); 3432 printf("%s freeing ifma: %p\n", __func__, ifma); 3433 #endif 3434 free(ifma->ifma_addr, M_IFMADDR); 3435 free(ifma, M_IFMADDR); 3436 } 3437 3438 static void 3439 if_destroymulti(epoch_context_t ctx) 3440 { 3441 struct ifmultiaddr *ifma; 3442 3443 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3444 if_freemulti_internal(ifma); 3445 } 3446 3447 void 3448 if_freemulti(struct ifmultiaddr *ifma) 3449 { 3450 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3451 ifma->ifma_refcount)); 3452 3453 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3454 } 3455 3456 3457 /* 3458 * Register an additional multicast address with a network interface. 3459 * 3460 * - If the address is already present, bump the reference count on the 3461 * address and return. 3462 * - If the address is not link-layer, look up a link layer address. 3463 * - Allocate address structures for one or both addresses, and attach to the 3464 * multicast address list on the interface. If automatically adding a link 3465 * layer address, the protocol address will own a reference to the link 3466 * layer address, to be freed when it is freed. 3467 * - Notify the network device driver of an addition to the multicast address 3468 * list. 3469 * 3470 * 'sa' points to caller-owned memory with the desired multicast address. 3471 * 3472 * 'retifma' will be used to return a pointer to the resulting multicast 3473 * address reference, if desired. 3474 */ 3475 int 3476 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3477 struct ifmultiaddr **retifma) 3478 { 3479 struct ifmultiaddr *ifma, *ll_ifma; 3480 struct sockaddr *llsa; 3481 struct sockaddr_dl sdl; 3482 int error; 3483 3484 #ifdef INET 3485 IN_MULTI_LIST_UNLOCK_ASSERT(); 3486 #endif 3487 #ifdef INET6 3488 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3489 #endif 3490 /* 3491 * If the address is already present, return a new reference to it; 3492 * otherwise, allocate storage and set up a new address. 3493 */ 3494 IF_ADDR_WLOCK(ifp); 3495 ifma = if_findmulti(ifp, sa); 3496 if (ifma != NULL) { 3497 ifma->ifma_refcount++; 3498 if (retifma != NULL) 3499 *retifma = ifma; 3500 IF_ADDR_WUNLOCK(ifp); 3501 return (0); 3502 } 3503 3504 /* 3505 * The address isn't already present; resolve the protocol address 3506 * into a link layer address, and then look that up, bump its 3507 * refcount or allocate an ifma for that also. 3508 * Most link layer resolving functions returns address data which 3509 * fits inside default sockaddr_dl structure. However callback 3510 * can allocate another sockaddr structure, in that case we need to 3511 * free it later. 3512 */ 3513 llsa = NULL; 3514 ll_ifma = NULL; 3515 if (ifp->if_resolvemulti != NULL) { 3516 /* Provide called function with buffer size information */ 3517 sdl.sdl_len = sizeof(sdl); 3518 llsa = (struct sockaddr *)&sdl; 3519 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3520 if (error) 3521 goto unlock_out; 3522 } 3523 3524 /* 3525 * Allocate the new address. Don't hook it up yet, as we may also 3526 * need to allocate a link layer multicast address. 3527 */ 3528 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3529 if (ifma == NULL) { 3530 error = ENOMEM; 3531 goto free_llsa_out; 3532 } 3533 3534 /* 3535 * If a link layer address is found, we'll need to see if it's 3536 * already present in the address list, or allocate is as well. 3537 * When this block finishes, the link layer address will be on the 3538 * list. 3539 */ 3540 if (llsa != NULL) { 3541 ll_ifma = if_findmulti(ifp, llsa); 3542 if (ll_ifma == NULL) { 3543 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3544 if (ll_ifma == NULL) { 3545 --ifma->ifma_refcount; 3546 if_freemulti(ifma); 3547 error = ENOMEM; 3548 goto free_llsa_out; 3549 } 3550 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3551 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3552 ifma_link); 3553 } else 3554 ll_ifma->ifma_refcount++; 3555 ifma->ifma_llifma = ll_ifma; 3556 } 3557 3558 /* 3559 * We now have a new multicast address, ifma, and possibly a new or 3560 * referenced link layer address. Add the primary address to the 3561 * ifnet address list. 3562 */ 3563 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3564 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3565 3566 if (retifma != NULL) 3567 *retifma = ifma; 3568 3569 /* 3570 * Must generate the message while holding the lock so that 'ifma' 3571 * pointer is still valid. 3572 */ 3573 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3574 IF_ADDR_WUNLOCK(ifp); 3575 3576 /* 3577 * We are certain we have added something, so call down to the 3578 * interface to let them know about it. 3579 */ 3580 if (ifp->if_ioctl != NULL) { 3581 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3582 } 3583 3584 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3585 link_free_sdl(llsa); 3586 3587 return (0); 3588 3589 free_llsa_out: 3590 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3591 link_free_sdl(llsa); 3592 3593 unlock_out: 3594 IF_ADDR_WUNLOCK(ifp); 3595 return (error); 3596 } 3597 3598 /* 3599 * Delete a multicast group membership by network-layer group address. 3600 * 3601 * Returns ENOENT if the entry could not be found. If ifp no longer 3602 * exists, results are undefined. This entry point should only be used 3603 * from subsystems which do appropriate locking to hold ifp for the 3604 * duration of the call. 3605 * Network-layer protocol domains must use if_delmulti_ifma(). 3606 */ 3607 int 3608 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3609 { 3610 struct ifmultiaddr *ifma; 3611 int lastref; 3612 #ifdef INVARIANTS 3613 struct ifnet *oifp; 3614 3615 IFNET_RLOCK_NOSLEEP(); 3616 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3617 if (ifp == oifp) 3618 break; 3619 if (ifp != oifp) 3620 ifp = NULL; 3621 IFNET_RUNLOCK_NOSLEEP(); 3622 3623 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3624 #endif 3625 if (ifp == NULL) 3626 return (ENOENT); 3627 3628 IF_ADDR_WLOCK(ifp); 3629 lastref = 0; 3630 ifma = if_findmulti(ifp, sa); 3631 if (ifma != NULL) 3632 lastref = if_delmulti_locked(ifp, ifma, 0); 3633 IF_ADDR_WUNLOCK(ifp); 3634 3635 if (ifma == NULL) 3636 return (ENOENT); 3637 3638 if (lastref && ifp->if_ioctl != NULL) { 3639 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3640 } 3641 3642 return (0); 3643 } 3644 3645 /* 3646 * Delete all multicast group membership for an interface. 3647 * Should be used to quickly flush all multicast filters. 3648 */ 3649 void 3650 if_delallmulti(struct ifnet *ifp) 3651 { 3652 struct ifmultiaddr *ifma; 3653 struct ifmultiaddr *next; 3654 3655 IF_ADDR_WLOCK(ifp); 3656 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3657 if_delmulti_locked(ifp, ifma, 0); 3658 IF_ADDR_WUNLOCK(ifp); 3659 } 3660 3661 void 3662 if_delmulti_ifma(struct ifmultiaddr *ifma) 3663 { 3664 if_delmulti_ifma_flags(ifma, 0); 3665 } 3666 3667 /* 3668 * Delete a multicast group membership by group membership pointer. 3669 * Network-layer protocol domains must use this routine. 3670 * 3671 * It is safe to call this routine if the ifp disappeared. 3672 */ 3673 void 3674 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3675 { 3676 struct ifnet *ifp; 3677 int lastref; 3678 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3679 #ifdef INET 3680 IN_MULTI_LIST_UNLOCK_ASSERT(); 3681 #endif 3682 ifp = ifma->ifma_ifp; 3683 #ifdef DIAGNOSTIC 3684 if (ifp == NULL) { 3685 printf("%s: ifma_ifp seems to be detached\n", __func__); 3686 } else { 3687 struct ifnet *oifp; 3688 3689 IFNET_RLOCK_NOSLEEP(); 3690 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3691 if (ifp == oifp) 3692 break; 3693 if (ifp != oifp) 3694 ifp = NULL; 3695 IFNET_RUNLOCK_NOSLEEP(); 3696 } 3697 #endif 3698 /* 3699 * If and only if the ifnet instance exists: Acquire the address lock. 3700 */ 3701 if (ifp != NULL) 3702 IF_ADDR_WLOCK(ifp); 3703 3704 lastref = if_delmulti_locked(ifp, ifma, flags); 3705 3706 if (ifp != NULL) { 3707 /* 3708 * If and only if the ifnet instance exists: 3709 * Release the address lock. 3710 * If the group was left: update the hardware hash filter. 3711 */ 3712 IF_ADDR_WUNLOCK(ifp); 3713 if (lastref && ifp->if_ioctl != NULL) { 3714 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3715 } 3716 } 3717 } 3718 3719 /* 3720 * Perform deletion of network-layer and/or link-layer multicast address. 3721 * 3722 * Return 0 if the reference count was decremented. 3723 * Return 1 if the final reference was released, indicating that the 3724 * hardware hash filter should be reprogrammed. 3725 */ 3726 static int 3727 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3728 { 3729 struct ifmultiaddr *ll_ifma; 3730 3731 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3732 KASSERT(ifma->ifma_ifp == ifp, 3733 ("%s: inconsistent ifp %p", __func__, ifp)); 3734 IF_ADDR_WLOCK_ASSERT(ifp); 3735 } 3736 3737 ifp = ifma->ifma_ifp; 3738 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3739 3740 /* 3741 * If the ifnet is detaching, null out references to ifnet, 3742 * so that upper protocol layers will notice, and not attempt 3743 * to obtain locks for an ifnet which no longer exists. The 3744 * routing socket announcement must happen before the ifnet 3745 * instance is detached from the system. 3746 */ 3747 if (detaching) { 3748 #ifdef DIAGNOSTIC 3749 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3750 #endif 3751 /* 3752 * ifp may already be nulled out if we are being reentered 3753 * to delete the ll_ifma. 3754 */ 3755 if (ifp != NULL) { 3756 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3757 ifma->ifma_ifp = NULL; 3758 } 3759 } 3760 3761 if (--ifma->ifma_refcount > 0) 3762 return 0; 3763 3764 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3765 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3766 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3767 } 3768 /* 3769 * If this ifma is a network-layer ifma, a link-layer ifma may 3770 * have been associated with it. Release it first if so. 3771 */ 3772 ll_ifma = ifma->ifma_llifma; 3773 if (ll_ifma != NULL) { 3774 KASSERT(ifma->ifma_lladdr != NULL, 3775 ("%s: llifma w/o lladdr", __func__)); 3776 if (detaching) 3777 ll_ifma->ifma_ifp = NULL; /* XXX */ 3778 if (--ll_ifma->ifma_refcount == 0) { 3779 if (ifp != NULL) { 3780 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3781 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3782 ifma_link); 3783 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3784 } 3785 } 3786 if_freemulti(ll_ifma); 3787 } 3788 } 3789 #ifdef INVARIANTS 3790 if (ifp) { 3791 struct ifmultiaddr *ifmatmp; 3792 3793 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3794 MPASS(ifma != ifmatmp); 3795 } 3796 #endif 3797 if_freemulti(ifma); 3798 /* 3799 * The last reference to this instance of struct ifmultiaddr 3800 * was released; the hardware should be notified of this change. 3801 */ 3802 return 1; 3803 } 3804 3805 /* 3806 * Set the link layer address on an interface. 3807 * 3808 * At this time we only support certain types of interfaces, 3809 * and we don't allow the length of the address to change. 3810 * 3811 * Set noinline to be dtrace-friendly 3812 */ 3813 __noinline int 3814 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3815 { 3816 struct sockaddr_dl *sdl; 3817 struct ifaddr *ifa; 3818 struct ifreq ifr; 3819 int rc; 3820 3821 rc = 0; 3822 NET_EPOCH_ENTER(); 3823 ifa = ifp->if_addr; 3824 if (ifa == NULL) { 3825 rc = EINVAL; 3826 goto out; 3827 } 3828 3829 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3830 if (sdl == NULL) { 3831 rc = EINVAL; 3832 goto out; 3833 } 3834 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3835 rc = EINVAL; 3836 goto out; 3837 } 3838 switch (ifp->if_type) { 3839 case IFT_ETHER: 3840 case IFT_XETHER: 3841 case IFT_L2VLAN: 3842 case IFT_BRIDGE: 3843 case IFT_IEEE8023ADLAG: 3844 bcopy(lladdr, LLADDR(sdl), len); 3845 break; 3846 default: 3847 rc = ENODEV; 3848 goto out; 3849 } 3850 3851 /* 3852 * If the interface is already up, we need 3853 * to re-init it in order to reprogram its 3854 * address filter. 3855 */ 3856 NET_EPOCH_EXIT(); 3857 if ((ifp->if_flags & IFF_UP) != 0) { 3858 if (ifp->if_ioctl) { 3859 ifp->if_flags &= ~IFF_UP; 3860 ifr.ifr_flags = ifp->if_flags & 0xffff; 3861 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3862 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3863 ifp->if_flags |= IFF_UP; 3864 ifr.ifr_flags = ifp->if_flags & 0xffff; 3865 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3866 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3867 } 3868 } 3869 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3870 return (0); 3871 out: 3872 NET_EPOCH_EXIT(); 3873 return (rc); 3874 } 3875 3876 /* 3877 * Compat function for handling basic encapsulation requests. 3878 * Not converted stacks (FDDI, IB, ..) supports traditional 3879 * output model: ARP (and other similar L2 protocols) are handled 3880 * inside output routine, arpresolve/nd6_resolve() returns MAC 3881 * address instead of full prepend. 3882 * 3883 * This function creates calculated header==MAC for IPv4/IPv6 and 3884 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3885 * address families. 3886 */ 3887 static int 3888 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3889 { 3890 3891 if (req->rtype != IFENCAP_LL) 3892 return (EOPNOTSUPP); 3893 3894 if (req->bufsize < req->lladdr_len) 3895 return (ENOMEM); 3896 3897 switch (req->family) { 3898 case AF_INET: 3899 case AF_INET6: 3900 break; 3901 default: 3902 return (EAFNOSUPPORT); 3903 } 3904 3905 /* Copy lladdr to storage as is */ 3906 memmove(req->buf, req->lladdr, req->lladdr_len); 3907 req->bufsize = req->lladdr_len; 3908 req->lladdr_off = 0; 3909 3910 return (0); 3911 } 3912 3913 /* 3914 * Tunnel interfaces can nest, also they may cause infinite recursion 3915 * calls when misconfigured. We'll prevent this by detecting loops. 3916 * High nesting level may cause stack exhaustion. We'll prevent this 3917 * by introducing upper limit. 3918 * 3919 * Return 0, if tunnel nesting count is equal or less than limit. 3920 */ 3921 int 3922 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3923 int limit) 3924 { 3925 struct m_tag *mtag; 3926 int count; 3927 3928 count = 1; 3929 mtag = NULL; 3930 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3931 if (*(struct ifnet **)(mtag + 1) == ifp) { 3932 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3933 return (EIO); 3934 } 3935 count++; 3936 } 3937 if (count > limit) { 3938 log(LOG_NOTICE, 3939 "%s: if_output recursively called too many times(%d)\n", 3940 if_name(ifp), count); 3941 return (EIO); 3942 } 3943 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3944 if (mtag == NULL) 3945 return (ENOMEM); 3946 *(struct ifnet **)(mtag + 1) = ifp; 3947 m_tag_prepend(m, mtag); 3948 return (0); 3949 } 3950 3951 /* 3952 * Get the link layer address that was read from the hardware at attach. 3953 * 3954 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3955 * their component interfaces as IFT_IEEE8023ADLAG. 3956 */ 3957 int 3958 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3959 { 3960 3961 if (ifp->if_hw_addr == NULL) 3962 return (ENODEV); 3963 3964 switch (ifp->if_type) { 3965 case IFT_ETHER: 3966 case IFT_IEEE8023ADLAG: 3967 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3968 return (0); 3969 default: 3970 return (ENODEV); 3971 } 3972 } 3973 3974 /* 3975 * The name argument must be a pointer to storage which will last as 3976 * long as the interface does. For physical devices, the result of 3977 * device_get_name(dev) is a good choice and for pseudo-devices a 3978 * static string works well. 3979 */ 3980 void 3981 if_initname(struct ifnet *ifp, const char *name, int unit) 3982 { 3983 ifp->if_dname = name; 3984 ifp->if_dunit = unit; 3985 if (unit != IF_DUNIT_NONE) 3986 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3987 else 3988 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3989 } 3990 3991 int 3992 if_printf(struct ifnet *ifp, const char *fmt, ...) 3993 { 3994 char if_fmt[256]; 3995 va_list ap; 3996 3997 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3998 va_start(ap, fmt); 3999 vlog(LOG_INFO, if_fmt, ap); 4000 va_end(ap); 4001 return (0); 4002 } 4003 4004 void 4005 if_start(struct ifnet *ifp) 4006 { 4007 4008 (*(ifp)->if_start)(ifp); 4009 } 4010 4011 /* 4012 * Backwards compatibility interface for drivers 4013 * that have not implemented it 4014 */ 4015 static int 4016 if_transmit(struct ifnet *ifp, struct mbuf *m) 4017 { 4018 int error; 4019 4020 IFQ_HANDOFF(ifp, m, error); 4021 return (error); 4022 } 4023 4024 static void 4025 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4026 { 4027 4028 m_freem(m); 4029 } 4030 4031 int 4032 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4033 { 4034 int active = 0; 4035 4036 IF_LOCK(ifq); 4037 if (_IF_QFULL(ifq)) { 4038 IF_UNLOCK(ifq); 4039 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4040 m_freem(m); 4041 return (0); 4042 } 4043 if (ifp != NULL) { 4044 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4045 if (m->m_flags & (M_BCAST|M_MCAST)) 4046 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4047 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4048 } 4049 _IF_ENQUEUE(ifq, m); 4050 IF_UNLOCK(ifq); 4051 if (ifp != NULL && !active) 4052 (*(ifp)->if_start)(ifp); 4053 return (1); 4054 } 4055 4056 void 4057 if_register_com_alloc(u_char type, 4058 if_com_alloc_t *a, if_com_free_t *f) 4059 { 4060 4061 KASSERT(if_com_alloc[type] == NULL, 4062 ("if_register_com_alloc: %d already registered", type)); 4063 KASSERT(if_com_free[type] == NULL, 4064 ("if_register_com_alloc: %d free already registered", type)); 4065 4066 if_com_alloc[type] = a; 4067 if_com_free[type] = f; 4068 } 4069 4070 void 4071 if_deregister_com_alloc(u_char type) 4072 { 4073 4074 KASSERT(if_com_alloc[type] != NULL, 4075 ("if_deregister_com_alloc: %d not registered", type)); 4076 KASSERT(if_com_free[type] != NULL, 4077 ("if_deregister_com_alloc: %d free not registered", type)); 4078 if_com_alloc[type] = NULL; 4079 if_com_free[type] = NULL; 4080 } 4081 4082 /* API for driver access to network stack owned ifnet.*/ 4083 uint64_t 4084 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4085 { 4086 uint64_t oldbrate; 4087 4088 oldbrate = ifp->if_baudrate; 4089 ifp->if_baudrate = baudrate; 4090 return (oldbrate); 4091 } 4092 4093 uint64_t 4094 if_getbaudrate(if_t ifp) 4095 { 4096 4097 return (((struct ifnet *)ifp)->if_baudrate); 4098 } 4099 4100 int 4101 if_setcapabilities(if_t ifp, int capabilities) 4102 { 4103 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4104 return (0); 4105 } 4106 4107 int 4108 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4109 { 4110 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4111 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4112 4113 return (0); 4114 } 4115 4116 int 4117 if_getcapabilities(if_t ifp) 4118 { 4119 return ((struct ifnet *)ifp)->if_capabilities; 4120 } 4121 4122 int 4123 if_setcapenable(if_t ifp, int capabilities) 4124 { 4125 ((struct ifnet *)ifp)->if_capenable = capabilities; 4126 return (0); 4127 } 4128 4129 int 4130 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4131 { 4132 if(setcap) 4133 ((struct ifnet *)ifp)->if_capenable |= setcap; 4134 if(clearcap) 4135 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4136 4137 return (0); 4138 } 4139 4140 const char * 4141 if_getdname(if_t ifp) 4142 { 4143 return ((struct ifnet *)ifp)->if_dname; 4144 } 4145 4146 int 4147 if_togglecapenable(if_t ifp, int togglecap) 4148 { 4149 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4150 return (0); 4151 } 4152 4153 int 4154 if_getcapenable(if_t ifp) 4155 { 4156 return ((struct ifnet *)ifp)->if_capenable; 4157 } 4158 4159 /* 4160 * This is largely undesirable because it ties ifnet to a device, but does 4161 * provide flexiblity for an embedded product vendor. Should be used with 4162 * the understanding that it violates the interface boundaries, and should be 4163 * a last resort only. 4164 */ 4165 int 4166 if_setdev(if_t ifp, void *dev) 4167 { 4168 return (0); 4169 } 4170 4171 int 4172 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4173 { 4174 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4175 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4176 4177 return (0); 4178 } 4179 4180 int 4181 if_getdrvflags(if_t ifp) 4182 { 4183 return ((struct ifnet *)ifp)->if_drv_flags; 4184 } 4185 4186 int 4187 if_setdrvflags(if_t ifp, int flags) 4188 { 4189 ((struct ifnet *)ifp)->if_drv_flags = flags; 4190 return (0); 4191 } 4192 4193 4194 int 4195 if_setflags(if_t ifp, int flags) 4196 { 4197 ((struct ifnet *)ifp)->if_flags = flags; 4198 return (0); 4199 } 4200 4201 int 4202 if_setflagbits(if_t ifp, int set, int clear) 4203 { 4204 ((struct ifnet *)ifp)->if_flags |= set; 4205 ((struct ifnet *)ifp)->if_flags &= ~clear; 4206 4207 return (0); 4208 } 4209 4210 int 4211 if_getflags(if_t ifp) 4212 { 4213 return ((struct ifnet *)ifp)->if_flags; 4214 } 4215 4216 int 4217 if_clearhwassist(if_t ifp) 4218 { 4219 ((struct ifnet *)ifp)->if_hwassist = 0; 4220 return (0); 4221 } 4222 4223 int 4224 if_sethwassistbits(if_t ifp, int toset, int toclear) 4225 { 4226 ((struct ifnet *)ifp)->if_hwassist |= toset; 4227 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4228 4229 return (0); 4230 } 4231 4232 int 4233 if_sethwassist(if_t ifp, int hwassist_bit) 4234 { 4235 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4236 return (0); 4237 } 4238 4239 int 4240 if_gethwassist(if_t ifp) 4241 { 4242 return ((struct ifnet *)ifp)->if_hwassist; 4243 } 4244 4245 int 4246 if_setmtu(if_t ifp, int mtu) 4247 { 4248 ((struct ifnet *)ifp)->if_mtu = mtu; 4249 return (0); 4250 } 4251 4252 int 4253 if_getmtu(if_t ifp) 4254 { 4255 return ((struct ifnet *)ifp)->if_mtu; 4256 } 4257 4258 int 4259 if_getmtu_family(if_t ifp, int family) 4260 { 4261 struct domain *dp; 4262 4263 for (dp = domains; dp; dp = dp->dom_next) { 4264 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4265 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4266 } 4267 4268 return (((struct ifnet *)ifp)->if_mtu); 4269 } 4270 4271 int 4272 if_setsoftc(if_t ifp, void *softc) 4273 { 4274 ((struct ifnet *)ifp)->if_softc = softc; 4275 return (0); 4276 } 4277 4278 void * 4279 if_getsoftc(if_t ifp) 4280 { 4281 return ((struct ifnet *)ifp)->if_softc; 4282 } 4283 4284 void 4285 if_setrcvif(struct mbuf *m, if_t ifp) 4286 { 4287 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4288 } 4289 4290 void 4291 if_setvtag(struct mbuf *m, uint16_t tag) 4292 { 4293 m->m_pkthdr.ether_vtag = tag; 4294 } 4295 4296 uint16_t 4297 if_getvtag(struct mbuf *m) 4298 { 4299 4300 return (m->m_pkthdr.ether_vtag); 4301 } 4302 4303 int 4304 if_sendq_empty(if_t ifp) 4305 { 4306 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4307 } 4308 4309 struct ifaddr * 4310 if_getifaddr(if_t ifp) 4311 { 4312 return ((struct ifnet *)ifp)->if_addr; 4313 } 4314 4315 int 4316 if_getamcount(if_t ifp) 4317 { 4318 return ((struct ifnet *)ifp)->if_amcount; 4319 } 4320 4321 4322 int 4323 if_setsendqready(if_t ifp) 4324 { 4325 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4326 return (0); 4327 } 4328 4329 int 4330 if_setsendqlen(if_t ifp, int tx_desc_count) 4331 { 4332 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4333 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4334 4335 return (0); 4336 } 4337 4338 int 4339 if_vlantrunkinuse(if_t ifp) 4340 { 4341 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4342 } 4343 4344 int 4345 if_input(if_t ifp, struct mbuf* sendmp) 4346 { 4347 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4348 return (0); 4349 4350 } 4351 4352 /* XXX */ 4353 #ifndef ETH_ADDR_LEN 4354 #define ETH_ADDR_LEN 6 4355 #endif 4356 4357 int 4358 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4359 { 4360 struct ifmultiaddr *ifma; 4361 uint8_t *lmta = (uint8_t *)mta; 4362 int mcnt = 0; 4363 4364 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4365 if (ifma->ifma_addr->sa_family != AF_LINK) 4366 continue; 4367 4368 if (mcnt == max) 4369 break; 4370 4371 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4372 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4373 mcnt++; 4374 } 4375 *cnt = mcnt; 4376 4377 return (0); 4378 } 4379 4380 int 4381 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4382 { 4383 int error; 4384 4385 if_maddr_rlock(ifp); 4386 error = if_setupmultiaddr(ifp, mta, cnt, max); 4387 if_maddr_runlock(ifp); 4388 return (error); 4389 } 4390 4391 int 4392 if_multiaddr_count(if_t ifp, int max) 4393 { 4394 struct ifmultiaddr *ifma; 4395 int count; 4396 4397 count = 0; 4398 if_maddr_rlock(ifp); 4399 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4400 if (ifma->ifma_addr->sa_family != AF_LINK) 4401 continue; 4402 count++; 4403 if (count == max) 4404 break; 4405 } 4406 if_maddr_runlock(ifp); 4407 return (count); 4408 } 4409 4410 int 4411 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4412 { 4413 struct ifmultiaddr *ifma; 4414 int cnt = 0; 4415 4416 if_maddr_rlock(ifp); 4417 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4418 cnt += filter(arg, ifma, cnt); 4419 if_maddr_runlock(ifp); 4420 return (cnt); 4421 } 4422 4423 struct mbuf * 4424 if_dequeue(if_t ifp) 4425 { 4426 struct mbuf *m; 4427 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4428 4429 return (m); 4430 } 4431 4432 int 4433 if_sendq_prepend(if_t ifp, struct mbuf *m) 4434 { 4435 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4436 return (0); 4437 } 4438 4439 int 4440 if_setifheaderlen(if_t ifp, int len) 4441 { 4442 ((struct ifnet *)ifp)->if_hdrlen = len; 4443 return (0); 4444 } 4445 4446 caddr_t 4447 if_getlladdr(if_t ifp) 4448 { 4449 return (IF_LLADDR((struct ifnet *)ifp)); 4450 } 4451 4452 void * 4453 if_gethandle(u_char type) 4454 { 4455 return (if_alloc(type)); 4456 } 4457 4458 void 4459 if_bpfmtap(if_t ifh, struct mbuf *m) 4460 { 4461 struct ifnet *ifp = (struct ifnet *)ifh; 4462 4463 BPF_MTAP(ifp, m); 4464 } 4465 4466 void 4467 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4468 { 4469 struct ifnet *ifp = (struct ifnet *)ifh; 4470 4471 ETHER_BPF_MTAP(ifp, m); 4472 } 4473 4474 void 4475 if_vlancap(if_t ifh) 4476 { 4477 struct ifnet *ifp = (struct ifnet *)ifh; 4478 VLAN_CAPABILITIES(ifp); 4479 } 4480 4481 int 4482 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4483 { 4484 4485 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4486 return (0); 4487 } 4488 4489 int 4490 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4491 { 4492 4493 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4494 return (0); 4495 } 4496 4497 int 4498 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4499 { 4500 4501 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4502 return (0); 4503 } 4504 4505 u_int 4506 if_gethwtsomax(if_t ifp) 4507 { 4508 4509 return (((struct ifnet *)ifp)->if_hw_tsomax); 4510 } 4511 4512 u_int 4513 if_gethwtsomaxsegcount(if_t ifp) 4514 { 4515 4516 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4517 } 4518 4519 u_int 4520 if_gethwtsomaxsegsize(if_t ifp) 4521 { 4522 4523 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4524 } 4525 4526 void 4527 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4528 { 4529 ((struct ifnet *)ifp)->if_init = init_fn; 4530 } 4531 4532 void 4533 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4534 { 4535 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4536 } 4537 4538 void 4539 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4540 { 4541 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4542 } 4543 4544 void 4545 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4546 { 4547 ((struct ifnet *)ifp)->if_transmit = start_fn; 4548 } 4549 4550 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4551 { 4552 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4553 4554 } 4555 4556 void 4557 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4558 { 4559 4560 ifp->if_get_counter = fn; 4561 } 4562 4563 /* Revisit these - These are inline functions originally. */ 4564 int 4565 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4566 { 4567 return drbr_inuse(ifh, br); 4568 } 4569 4570 struct mbuf* 4571 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4572 { 4573 return drbr_dequeue(ifh, br); 4574 } 4575 4576 int 4577 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4578 { 4579 return drbr_needs_enqueue(ifh, br); 4580 } 4581 4582 int 4583 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4584 { 4585 return drbr_enqueue(ifh, br, m); 4586 4587 } 4588