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/conf.h> 40 #include <sys/eventhandler.h> 41 #include <sys/malloc.h> 42 #include <sys/domainset.h> 43 #include <sys/sbuf.h> 44 #include <sys/bus.h> 45 #include <sys/epoch.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/priv.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/refcount.h> 56 #include <sys/module.h> 57 #include <sys/rwlock.h> 58 #include <sys/sockio.h> 59 #include <sys/syslog.h> 60 #include <sys/sysctl.h> 61 #include <sys/sysent.h> 62 #include <sys/taskqueue.h> 63 #include <sys/domain.h> 64 #include <sys/jail.h> 65 #include <sys/priv.h> 66 67 #include <machine/stdarg.h> 68 #include <vm/uma.h> 69 70 #include <net/bpf.h> 71 #include <net/ethernet.h> 72 #include <net/if.h> 73 #include <net/if_arp.h> 74 #include <net/if_clone.h> 75 #include <net/if_dl.h> 76 #include <net/if_types.h> 77 #include <net/if_var.h> 78 #include <net/if_media.h> 79 #include <net/if_vlan_var.h> 80 #include <net/radix.h> 81 #include <net/route.h> 82 #include <net/vnet.h> 83 84 #if defined(INET) || defined(INET6) 85 #include <net/ethernet.h> 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet/ip.h> 89 #include <netinet/ip_carp.h> 90 #ifdef INET 91 #include <netinet/if_ether.h> 92 #include <netinet/netdump/netdump.h> 93 #endif /* INET */ 94 #ifdef INET6 95 #include <netinet6/in6_var.h> 96 #include <netinet6/in6_ifattach.h> 97 #endif /* INET6 */ 98 #endif /* INET || INET6 */ 99 100 #include <security/mac/mac_framework.h> 101 102 /* 103 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 104 * and ifr_ifru when it is used in SIOCGIFCONF. 105 */ 106 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 107 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 108 109 __read_mostly epoch_t net_epoch_preempt; 110 __read_mostly epoch_t net_epoch; 111 #ifdef COMPAT_FREEBSD32 112 #include <sys/mount.h> 113 #include <compat/freebsd32/freebsd32.h> 114 115 struct ifreq_buffer32 { 116 uint32_t length; /* (size_t) */ 117 uint32_t buffer; /* (void *) */ 118 }; 119 120 /* 121 * Interface request structure used for socket 122 * ioctl's. All interface ioctl's must have parameter 123 * definitions which begin with ifr_name. The 124 * remainder may be interface specific. 125 */ 126 struct ifreq32 { 127 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 128 union { 129 struct sockaddr ifru_addr; 130 struct sockaddr ifru_dstaddr; 131 struct sockaddr ifru_broadaddr; 132 struct ifreq_buffer32 ifru_buffer; 133 short ifru_flags[2]; 134 short ifru_index; 135 int ifru_jid; 136 int ifru_metric; 137 int ifru_mtu; 138 int ifru_phys; 139 int ifru_media; 140 uint32_t ifru_data; 141 int ifru_cap[2]; 142 u_int ifru_fib; 143 u_char ifru_vlan_pcp; 144 } ifr_ifru; 145 }; 146 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 147 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 148 __offsetof(struct ifreq32, ifr_ifru)); 149 150 struct ifgroupreq32 { 151 char ifgr_name[IFNAMSIZ]; 152 u_int ifgr_len; 153 union { 154 char ifgru_group[IFNAMSIZ]; 155 uint32_t ifgru_groups; 156 } ifgr_ifgru; 157 }; 158 159 struct ifmediareq32 { 160 char ifm_name[IFNAMSIZ]; 161 int ifm_current; 162 int ifm_mask; 163 int ifm_status; 164 int ifm_active; 165 int ifm_count; 166 uint32_t ifm_ulist; /* (int *) */ 167 }; 168 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 169 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 170 171 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 172 _IOC_NEWTYPE((cmd), struct ifgroupreq32): case 173 #else /* !COMPAT_FREEBSD32 */ 174 #define _CASE_IOC_IFGROUPREQ_32(cmd) 175 #endif /* !COMPAT_FREEBSD32 */ 176 177 #define CASE_IOC_IFGROUPREQ(cmd) \ 178 _CASE_IOC_IFGROUPREQ_32(cmd) \ 179 (cmd) 180 181 union ifreq_union { 182 struct ifreq ifr; 183 #ifdef COMPAT_FREEBSD32 184 struct ifreq32 ifr32; 185 #endif 186 }; 187 188 union ifgroupreq_union { 189 struct ifgroupreq ifgr; 190 #ifdef COMPAT_FREEBSD32 191 struct ifgroupreq32 ifgr32; 192 #endif 193 }; 194 195 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 196 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 197 198 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 199 &ifqmaxlen, 0, "max send queue size"); 200 201 /* Log link state change events */ 202 static int log_link_state_change = 1; 203 204 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 205 &log_link_state_change, 0, 206 "log interface link state change events"); 207 208 /* Log promiscuous mode change events */ 209 static int log_promisc_mode_change = 1; 210 211 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 212 &log_promisc_mode_change, 1, 213 "log promiscuous mode change events"); 214 215 /* Interface description */ 216 static unsigned int ifdescr_maxlen = 1024; 217 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 218 &ifdescr_maxlen, 0, 219 "administrative maximum length for interface description"); 220 221 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 222 223 /* global sx for non-critical path ifdescr */ 224 static struct sx ifdescr_sx; 225 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 226 227 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 228 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 229 /* These are external hooks for CARP. */ 230 void (*carp_linkstate_p)(struct ifnet *ifp); 231 void (*carp_demote_adj_p)(int, char *); 232 int (*carp_master_p)(struct ifaddr *); 233 #if defined(INET) || defined(INET6) 234 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 235 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 236 const struct sockaddr *sa); 237 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 238 int (*carp_attach_p)(struct ifaddr *, int); 239 void (*carp_detach_p)(struct ifaddr *, bool); 240 #endif 241 #ifdef INET 242 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 243 #endif 244 #ifdef INET6 245 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 246 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 247 const struct in6_addr *taddr); 248 #endif 249 250 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 251 252 /* 253 * XXX: Style; these should be sorted alphabetically, and unprototyped 254 * static functions should be prototyped. Currently they are sorted by 255 * declaration order. 256 */ 257 static void if_attachdomain(void *); 258 static void if_attachdomain1(struct ifnet *); 259 static int ifconf(u_long, caddr_t); 260 static void *if_grow(void); 261 static void if_input_default(struct ifnet *, struct mbuf *); 262 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 263 static void if_route(struct ifnet *, int flag, int fam); 264 static int if_setflag(struct ifnet *, int, int, int *, int); 265 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 266 static void if_unroute(struct ifnet *, int flag, int fam); 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 NET_EPOCH_ASSERT(); 357 358 ifp = ifnet_byindex_locked(idx); 359 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) 360 return (NULL); 361 if_ref(ifp); 362 return (ifp); 363 } 364 365 /* 366 * Allocate an ifindex array entry; return 0 on success or an error on 367 * failure. 368 */ 369 static u_short 370 ifindex_alloc(void **old) 371 { 372 u_short idx; 373 374 IFNET_WLOCK_ASSERT(); 375 /* 376 * Try to find an empty slot below V_if_index. If we fail, take the 377 * next slot. 378 */ 379 for (idx = 1; idx <= V_if_index; idx++) { 380 if (V_ifindex_table[idx] == NULL) 381 break; 382 } 383 384 /* Catch if_index overflow. */ 385 if (idx >= V_if_indexlim) { 386 *old = if_grow(); 387 return (USHRT_MAX); 388 } 389 if (idx > V_if_index) 390 V_if_index = idx; 391 return (idx); 392 } 393 394 static void 395 ifindex_free_locked(u_short idx) 396 { 397 398 IFNET_WLOCK_ASSERT(); 399 400 V_ifindex_table[idx] = NULL; 401 while (V_if_index > 0 && 402 V_ifindex_table[V_if_index] == NULL) 403 V_if_index--; 404 } 405 406 static void 407 ifindex_free(u_short idx) 408 { 409 410 IFNET_WLOCK(); 411 ifindex_free_locked(idx); 412 IFNET_WUNLOCK(); 413 } 414 415 static void 416 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 417 { 418 419 V_ifindex_table[idx] = ifp; 420 } 421 422 struct ifaddr * 423 ifaddr_byindex(u_short idx) 424 { 425 struct ifnet *ifp; 426 struct ifaddr *ifa = NULL; 427 428 NET_EPOCH_ASSERT(); 429 430 ifp = ifnet_byindex_locked(idx); 431 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 432 ifa_ref(ifa); 433 return (ifa); 434 } 435 436 /* 437 * Network interface utility routines. 438 * 439 * Routines with ifa_ifwith* names take sockaddr *'s as 440 * parameters. 441 */ 442 443 static void 444 vnet_if_init(const void *unused __unused) 445 { 446 void *old; 447 448 CK_STAILQ_INIT(&V_ifnet); 449 CK_STAILQ_INIT(&V_ifg_head); 450 IFNET_WLOCK(); 451 old = if_grow(); /* create initial table */ 452 IFNET_WUNLOCK(); 453 epoch_wait_preempt(net_epoch_preempt); 454 free(old, M_IFNET); 455 vnet_if_clone_init(); 456 } 457 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 458 NULL); 459 460 #ifdef VIMAGE 461 static void 462 vnet_if_uninit(const void *unused __unused) 463 { 464 465 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 466 "not empty", __func__, __LINE__, &V_ifnet)); 467 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 468 "not empty", __func__, __LINE__, &V_ifg_head)); 469 470 free((caddr_t)V_ifindex_table, M_IFNET); 471 } 472 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 473 vnet_if_uninit, NULL); 474 475 static void 476 vnet_if_return(const void *unused __unused) 477 { 478 struct ifnet *ifp, *nifp; 479 480 /* Return all inherited interfaces to their parent vnets. */ 481 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 482 if (ifp->if_home_vnet != ifp->if_vnet) 483 if_vmove(ifp, ifp->if_home_vnet); 484 } 485 } 486 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 487 vnet_if_return, NULL); 488 #endif 489 490 491 static void * 492 if_grow(void) 493 { 494 int oldlim; 495 u_int n; 496 struct ifnet **e; 497 void *old; 498 499 old = NULL; 500 IFNET_WLOCK_ASSERT(); 501 oldlim = V_if_indexlim; 502 IFNET_WUNLOCK(); 503 n = (oldlim << 1) * sizeof(*e); 504 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 505 IFNET_WLOCK(); 506 if (V_if_indexlim != oldlim) { 507 free(e, M_IFNET); 508 return (NULL); 509 } 510 if (V_ifindex_table != NULL) { 511 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 512 old = V_ifindex_table; 513 } 514 V_if_indexlim <<= 1; 515 V_ifindex_table = e; 516 return (old); 517 } 518 519 /* 520 * Allocate a struct ifnet and an index for an interface. A layer 2 521 * common structure will also be allocated if an allocation routine is 522 * registered for the passed type. 523 */ 524 struct ifnet * 525 if_alloc_domain(u_char type, int numa_domain) 526 { 527 struct ifnet *ifp; 528 u_short idx; 529 void *old; 530 531 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 532 if (numa_domain == IF_NODOM) 533 ifp = malloc(sizeof(struct ifnet), M_IFNET, 534 M_WAITOK | M_ZERO); 535 else 536 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 537 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 538 restart: 539 IFNET_WLOCK(); 540 idx = ifindex_alloc(&old); 541 if (__predict_false(idx == USHRT_MAX)) { 542 IFNET_WUNLOCK(); 543 epoch_wait_preempt(net_epoch_preempt); 544 free(old, M_IFNET); 545 goto restart; 546 } 547 ifnet_setbyindex(idx, IFNET_HOLD); 548 IFNET_WUNLOCK(); 549 ifp->if_index = idx; 550 ifp->if_type = type; 551 ifp->if_alloctype = type; 552 ifp->if_numa_domain = numa_domain; 553 #ifdef VIMAGE 554 ifp->if_vnet = curvnet; 555 #endif 556 if (if_com_alloc[type] != NULL) { 557 ifp->if_l2com = if_com_alloc[type](type, ifp); 558 if (ifp->if_l2com == NULL) { 559 free(ifp, M_IFNET); 560 ifindex_free(idx); 561 return (NULL); 562 } 563 } 564 565 IF_ADDR_LOCK_INIT(ifp); 566 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 567 ifp->if_afdata_initialized = 0; 568 IF_AFDATA_LOCK_INIT(ifp); 569 CK_STAILQ_INIT(&ifp->if_addrhead); 570 CK_STAILQ_INIT(&ifp->if_multiaddrs); 571 CK_STAILQ_INIT(&ifp->if_groups); 572 #ifdef MAC 573 mac_ifnet_init(ifp); 574 #endif 575 ifq_init(&ifp->if_snd, ifp); 576 577 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 578 for (int i = 0; i < IFCOUNTERS; i++) 579 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 580 ifp->if_get_counter = if_get_counter_default; 581 ifp->if_pcp = IFNET_PCP_NONE; 582 ifnet_setbyindex(ifp->if_index, ifp); 583 return (ifp); 584 } 585 586 struct ifnet * 587 if_alloc_dev(u_char type, device_t dev) 588 { 589 int numa_domain; 590 591 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 592 return (if_alloc_domain(type, IF_NODOM)); 593 return (if_alloc_domain(type, numa_domain)); 594 } 595 596 struct ifnet * 597 if_alloc(u_char type) 598 { 599 600 return (if_alloc_domain(type, IF_NODOM)); 601 } 602 /* 603 * Do the actual work of freeing a struct ifnet, and layer 2 common 604 * structure. This call is made when the last reference to an 605 * interface is released. 606 */ 607 static void 608 if_free_internal(struct ifnet *ifp) 609 { 610 611 KASSERT((ifp->if_flags & IFF_DYING), 612 ("if_free_internal: interface not dying")); 613 614 if (if_com_free[ifp->if_alloctype] != NULL) 615 if_com_free[ifp->if_alloctype](ifp->if_l2com, 616 ifp->if_alloctype); 617 618 #ifdef MAC 619 mac_ifnet_destroy(ifp); 620 #endif /* MAC */ 621 IF_AFDATA_DESTROY(ifp); 622 IF_ADDR_LOCK_DESTROY(ifp); 623 ifq_delete(&ifp->if_snd); 624 625 for (int i = 0; i < IFCOUNTERS; i++) 626 counter_u64_free(ifp->if_counters[i]); 627 628 free(ifp->if_description, M_IFDESCR); 629 free(ifp->if_hw_addr, M_IFADDR); 630 if (ifp->if_numa_domain == IF_NODOM) 631 free(ifp, M_IFNET); 632 else 633 free_domain(ifp, M_IFNET); 634 } 635 636 static void 637 if_destroy(epoch_context_t ctx) 638 { 639 struct ifnet *ifp; 640 641 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 642 if_free_internal(ifp); 643 } 644 645 /* 646 * Deregister an interface and free the associated storage. 647 */ 648 void 649 if_free(struct ifnet *ifp) 650 { 651 652 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 653 654 CURVNET_SET_QUIET(ifp->if_vnet); 655 IFNET_WLOCK(); 656 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 657 ("%s: freeing unallocated ifnet", ifp->if_xname)); 658 659 ifindex_free_locked(ifp->if_index); 660 IFNET_WUNLOCK(); 661 662 if (refcount_release(&ifp->if_refcount)) 663 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 664 CURVNET_RESTORE(); 665 } 666 667 /* 668 * Interfaces to keep an ifnet type-stable despite the possibility of the 669 * driver calling if_free(). If there are additional references, we defer 670 * freeing the underlying data structure. 671 */ 672 void 673 if_ref(struct ifnet *ifp) 674 { 675 676 /* We don't assert the ifnet list lock here, but arguably should. */ 677 refcount_acquire(&ifp->if_refcount); 678 } 679 680 void 681 if_rele(struct ifnet *ifp) 682 { 683 684 if (!refcount_release(&ifp->if_refcount)) 685 return; 686 epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy); 687 } 688 689 void 690 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 691 { 692 693 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 694 695 if (ifq->ifq_maxlen == 0) 696 ifq->ifq_maxlen = ifqmaxlen; 697 698 ifq->altq_type = 0; 699 ifq->altq_disc = NULL; 700 ifq->altq_flags &= ALTQF_CANTCHANGE; 701 ifq->altq_tbr = NULL; 702 ifq->altq_ifp = ifp; 703 } 704 705 void 706 ifq_delete(struct ifaltq *ifq) 707 { 708 mtx_destroy(&ifq->ifq_mtx); 709 } 710 711 /* 712 * Perform generic interface initialization tasks and attach the interface 713 * to the list of "active" interfaces. If vmove flag is set on entry 714 * to if_attach_internal(), perform only a limited subset of initialization 715 * tasks, given that we are moving from one vnet to another an ifnet which 716 * has already been fully initialized. 717 * 718 * Note that if_detach_internal() removes group membership unconditionally 719 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 720 * Thus, when if_vmove() is applied to a cloned interface, group membership 721 * is lost while a cloned one always joins a group whose name is 722 * ifc->ifc_name. To recover this after if_detach_internal() and 723 * if_attach_internal(), the cloner should be specified to 724 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 725 * attempts to join a group whose name is ifc->ifc_name. 726 * 727 * XXX: 728 * - The decision to return void and thus require this function to 729 * succeed is questionable. 730 * - We should probably do more sanity checking. For instance we don't 731 * do anything to insure if_xname is unique or non-empty. 732 */ 733 void 734 if_attach(struct ifnet *ifp) 735 { 736 737 if_attach_internal(ifp, 0, NULL); 738 } 739 740 /* 741 * Compute the least common TSO limit. 742 */ 743 void 744 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 745 { 746 /* 747 * 1) If there is no limit currently, take the limit from 748 * the network adapter. 749 * 750 * 2) If the network adapter has a limit below the current 751 * limit, apply it. 752 */ 753 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 754 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 755 pmax->tsomaxbytes = ifp->if_hw_tsomax; 756 } 757 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 758 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 759 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 760 } 761 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 762 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 763 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 764 } 765 } 766 767 /* 768 * Update TSO limit of a network adapter. 769 * 770 * Returns zero if no change. Else non-zero. 771 */ 772 int 773 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 774 { 775 int retval = 0; 776 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 777 ifp->if_hw_tsomax = pmax->tsomaxbytes; 778 retval++; 779 } 780 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 781 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 782 retval++; 783 } 784 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 785 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 786 retval++; 787 } 788 return (retval); 789 } 790 791 static void 792 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 793 { 794 unsigned socksize, ifasize; 795 int namelen, masklen; 796 struct sockaddr_dl *sdl; 797 struct ifaddr *ifa; 798 799 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 800 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 801 ifp->if_xname); 802 803 #ifdef VIMAGE 804 ifp->if_vnet = curvnet; 805 if (ifp->if_home_vnet == NULL) 806 ifp->if_home_vnet = curvnet; 807 #endif 808 809 if_addgroup(ifp, IFG_ALL); 810 811 /* Restore group membership for cloned interfaces. */ 812 if (vmove && ifc != NULL) 813 if_clone_addgroup(ifp, ifc); 814 815 getmicrotime(&ifp->if_lastchange); 816 ifp->if_epoch = time_uptime; 817 818 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 819 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 820 ("transmit and qflush must both either be set or both be NULL")); 821 if (ifp->if_transmit == NULL) { 822 ifp->if_transmit = if_transmit; 823 ifp->if_qflush = if_qflush; 824 } 825 if (ifp->if_input == NULL) 826 ifp->if_input = if_input_default; 827 828 if (ifp->if_requestencap == NULL) 829 ifp->if_requestencap = if_requestencap_default; 830 831 if (!vmove) { 832 #ifdef MAC 833 mac_ifnet_create(ifp); 834 #endif 835 836 /* 837 * Create a Link Level name for this device. 838 */ 839 namelen = strlen(ifp->if_xname); 840 /* 841 * Always save enough space for any possiable name so we 842 * can do a rename in place later. 843 */ 844 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 845 socksize = masklen + ifp->if_addrlen; 846 if (socksize < sizeof(*sdl)) 847 socksize = sizeof(*sdl); 848 socksize = roundup2(socksize, sizeof(long)); 849 ifasize = sizeof(*ifa) + 2 * socksize; 850 ifa = ifa_alloc(ifasize, M_WAITOK); 851 sdl = (struct sockaddr_dl *)(ifa + 1); 852 sdl->sdl_len = socksize; 853 sdl->sdl_family = AF_LINK; 854 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 855 sdl->sdl_nlen = namelen; 856 sdl->sdl_index = ifp->if_index; 857 sdl->sdl_type = ifp->if_type; 858 ifp->if_addr = ifa; 859 ifa->ifa_ifp = ifp; 860 ifa->ifa_addr = (struct sockaddr *)sdl; 861 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 862 ifa->ifa_netmask = (struct sockaddr *)sdl; 863 sdl->sdl_len = masklen; 864 while (namelen != 0) 865 sdl->sdl_data[--namelen] = 0xff; 866 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 867 /* Reliably crash if used uninitialized. */ 868 ifp->if_broadcastaddr = NULL; 869 870 if (ifp->if_type == IFT_ETHER) { 871 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 872 M_WAITOK | M_ZERO); 873 } 874 875 #if defined(INET) || defined(INET6) 876 /* Use defaults for TSO, if nothing is set */ 877 if (ifp->if_hw_tsomax == 0 && 878 ifp->if_hw_tsomaxsegcount == 0 && 879 ifp->if_hw_tsomaxsegsize == 0) { 880 /* 881 * The TSO defaults needs to be such that an 882 * NFS mbuf list of 35 mbufs totalling just 883 * below 64K works and that a chain of mbufs 884 * can be defragged into at most 32 segments: 885 */ 886 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 887 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 888 ifp->if_hw_tsomaxsegcount = 35; 889 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 890 891 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 892 if (ifp->if_capabilities & IFCAP_TSO) { 893 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 894 ifp->if_hw_tsomax, 895 ifp->if_hw_tsomaxsegcount, 896 ifp->if_hw_tsomaxsegsize); 897 } 898 } 899 #endif 900 } 901 #ifdef VIMAGE 902 else { 903 /* 904 * Update the interface index in the link layer address 905 * of the interface. 906 */ 907 for (ifa = ifp->if_addr; ifa != NULL; 908 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 909 if (ifa->ifa_addr->sa_family == AF_LINK) { 910 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 911 sdl->sdl_index = ifp->if_index; 912 } 913 } 914 } 915 #endif 916 917 IFNET_WLOCK(); 918 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 919 #ifdef VIMAGE 920 curvnet->vnet_ifcnt++; 921 #endif 922 IFNET_WUNLOCK(); 923 924 if (domain_init_status >= 2) 925 if_attachdomain1(ifp); 926 927 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 928 if (IS_DEFAULT_VNET(curvnet)) 929 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 930 931 /* Announce the interface. */ 932 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 933 } 934 935 static void 936 if_epochalloc(void *dummy __unused) 937 { 938 939 net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT); 940 net_epoch = epoch_alloc("Net", 0); 941 } 942 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 943 if_epochalloc, NULL); 944 945 static void 946 if_attachdomain(void *dummy) 947 { 948 struct ifnet *ifp; 949 950 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 951 if_attachdomain1(ifp); 952 } 953 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 954 if_attachdomain, NULL); 955 956 static void 957 if_attachdomain1(struct ifnet *ifp) 958 { 959 struct domain *dp; 960 961 /* 962 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 963 * cannot lock ifp->if_afdata initialization, entirely. 964 */ 965 IF_AFDATA_LOCK(ifp); 966 if (ifp->if_afdata_initialized >= domain_init_status) { 967 IF_AFDATA_UNLOCK(ifp); 968 log(LOG_WARNING, "%s called more than once on %s\n", 969 __func__, ifp->if_xname); 970 return; 971 } 972 ifp->if_afdata_initialized = domain_init_status; 973 IF_AFDATA_UNLOCK(ifp); 974 975 /* address family dependent data region */ 976 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 977 for (dp = domains; dp; dp = dp->dom_next) { 978 if (dp->dom_ifattach) 979 ifp->if_afdata[dp->dom_family] = 980 (*dp->dom_ifattach)(ifp); 981 } 982 } 983 984 /* 985 * Remove any unicast or broadcast network addresses from an interface. 986 */ 987 void 988 if_purgeaddrs(struct ifnet *ifp) 989 { 990 struct ifaddr *ifa; 991 992 while (1) { 993 struct epoch_tracker et; 994 995 NET_EPOCH_ENTER(et); 996 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 997 if (ifa->ifa_addr->sa_family != AF_LINK) 998 break; 999 } 1000 NET_EPOCH_EXIT(et); 1001 1002 if (ifa == NULL) 1003 break; 1004 #ifdef INET 1005 /* XXX: Ugly!! ad hoc just for INET */ 1006 if (ifa->ifa_addr->sa_family == AF_INET) { 1007 struct ifaliasreq ifr; 1008 1009 bzero(&ifr, sizeof(ifr)); 1010 ifr.ifra_addr = *ifa->ifa_addr; 1011 if (ifa->ifa_dstaddr) 1012 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1013 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1014 NULL) == 0) 1015 continue; 1016 } 1017 #endif /* INET */ 1018 #ifdef INET6 1019 if (ifa->ifa_addr->sa_family == AF_INET6) { 1020 in6_purgeaddr(ifa); 1021 /* ifp_addrhead is already updated */ 1022 continue; 1023 } 1024 #endif /* INET6 */ 1025 IF_ADDR_WLOCK(ifp); 1026 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1027 IF_ADDR_WUNLOCK(ifp); 1028 ifa_free(ifa); 1029 } 1030 } 1031 1032 /* 1033 * Remove any multicast network addresses from an interface when an ifnet 1034 * is going away. 1035 */ 1036 static void 1037 if_purgemaddrs(struct ifnet *ifp) 1038 { 1039 struct ifmultiaddr *ifma; 1040 1041 IF_ADDR_WLOCK(ifp); 1042 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1043 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1044 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1045 if_delmulti_locked(ifp, ifma, 1); 1046 } 1047 IF_ADDR_WUNLOCK(ifp); 1048 } 1049 1050 /* 1051 * Detach an interface, removing it from the list of "active" interfaces. 1052 * If vmove flag is set on entry to if_detach_internal(), perform only a 1053 * limited subset of cleanup tasks, given that we are moving an ifnet from 1054 * one vnet to another, where it must be fully operational. 1055 * 1056 * XXXRW: There are some significant questions about event ordering, and 1057 * how to prevent things from starting to use the interface during detach. 1058 */ 1059 void 1060 if_detach(struct ifnet *ifp) 1061 { 1062 1063 CURVNET_SET_QUIET(ifp->if_vnet); 1064 if_detach_internal(ifp, 0, NULL); 1065 CURVNET_RESTORE(); 1066 } 1067 1068 /* 1069 * The vmove flag, if set, indicates that we are called from a callpath 1070 * that is moving an interface to a different vnet instance. 1071 * 1072 * The shutdown flag, if set, indicates that we are called in the 1073 * process of shutting down a vnet instance. Currently only the 1074 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1075 * on a vnet instance shutdown without this flag being set, e.g., when 1076 * the cloned interfaces are destoyed as first thing of teardown. 1077 */ 1078 static int 1079 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1080 { 1081 struct ifaddr *ifa; 1082 int i; 1083 struct domain *dp; 1084 struct ifnet *iter; 1085 int found = 0; 1086 #ifdef VIMAGE 1087 bool shutdown; 1088 1089 shutdown = ifp->if_vnet->vnet_shutdown; 1090 #endif 1091 IFNET_WLOCK(); 1092 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1093 if (iter == ifp) { 1094 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1095 if (!vmove) 1096 ifp->if_flags |= IFF_DYING; 1097 found = 1; 1098 break; 1099 } 1100 IFNET_WUNLOCK(); 1101 if (!found) { 1102 /* 1103 * While we would want to panic here, we cannot 1104 * guarantee that the interface is indeed still on 1105 * the list given we don't hold locks all the way. 1106 */ 1107 return (ENOENT); 1108 #if 0 1109 if (vmove) 1110 panic("%s: ifp=%p not on the ifnet tailq %p", 1111 __func__, ifp, &V_ifnet); 1112 else 1113 return; /* XXX this should panic as well? */ 1114 #endif 1115 } 1116 1117 /* 1118 * At this point we know the interface still was on the ifnet list 1119 * and we removed it so we are in a stable state. 1120 */ 1121 #ifdef VIMAGE 1122 curvnet->vnet_ifcnt--; 1123 #endif 1124 epoch_wait_preempt(net_epoch_preempt); 1125 1126 /* 1127 * Ensure all pending EPOCH(9) callbacks have been executed. This 1128 * fixes issues about late destruction of multicast options 1129 * which lead to leave group calls, which in turn access the 1130 * belonging ifnet structure: 1131 */ 1132 epoch_drain_callbacks(net_epoch_preempt); 1133 1134 /* 1135 * In any case (destroy or vmove) detach us from the groups 1136 * and remove/wait for pending events on the taskq. 1137 * XXX-BZ in theory an interface could still enqueue a taskq change? 1138 */ 1139 if_delgroups(ifp); 1140 1141 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1142 1143 /* 1144 * Check if this is a cloned interface or not. Must do even if 1145 * shutting down as a if_vmove_reclaim() would move the ifp and 1146 * the if_clone_addgroup() will have a corrupted string overwise 1147 * from a gibberish pointer. 1148 */ 1149 if (vmove && ifcp != NULL) 1150 *ifcp = if_clone_findifc(ifp); 1151 1152 if_down(ifp); 1153 1154 #ifdef VIMAGE 1155 /* 1156 * On VNET shutdown abort here as the stack teardown will do all 1157 * the work top-down for us. 1158 */ 1159 if (shutdown) { 1160 /* Give interface users the chance to clean up. */ 1161 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1162 1163 /* 1164 * In case of a vmove we are done here without error. 1165 * If we would signal an error it would lead to the same 1166 * abort as if we did not find the ifnet anymore. 1167 * if_detach() calls us in void context and does not care 1168 * about an early abort notification, so life is splendid :) 1169 */ 1170 goto finish_vnet_shutdown; 1171 } 1172 #endif 1173 1174 /* 1175 * At this point we are not tearing down a VNET and are either 1176 * going to destroy or vmove the interface and have to cleanup 1177 * accordingly. 1178 */ 1179 1180 /* 1181 * Remove routes and flush queues. 1182 */ 1183 #ifdef ALTQ 1184 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1185 altq_disable(&ifp->if_snd); 1186 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1187 altq_detach(&ifp->if_snd); 1188 #endif 1189 1190 if_purgeaddrs(ifp); 1191 1192 #ifdef INET 1193 in_ifdetach(ifp); 1194 #endif 1195 1196 #ifdef INET6 1197 /* 1198 * Remove all IPv6 kernel structs related to ifp. This should be done 1199 * before removing routing entries below, since IPv6 interface direct 1200 * routes are expected to be removed by the IPv6-specific kernel API. 1201 * Otherwise, the kernel will detect some inconsistency and bark it. 1202 */ 1203 in6_ifdetach(ifp); 1204 #endif 1205 if_purgemaddrs(ifp); 1206 1207 /* Announce that the interface is gone. */ 1208 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1209 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1210 if (IS_DEFAULT_VNET(curvnet)) 1211 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1212 1213 if (!vmove) { 1214 /* 1215 * Prevent further calls into the device driver via ifnet. 1216 */ 1217 if_dead(ifp); 1218 1219 /* 1220 * Clean up all addresses. 1221 */ 1222 IF_ADDR_WLOCK(ifp); 1223 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1224 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1225 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1226 IF_ADDR_WUNLOCK(ifp); 1227 ifa_free(ifa); 1228 } else 1229 IF_ADDR_WUNLOCK(ifp); 1230 } 1231 1232 rt_flushifroutes(ifp); 1233 1234 #ifdef VIMAGE 1235 finish_vnet_shutdown: 1236 #endif 1237 /* 1238 * We cannot hold the lock over dom_ifdetach calls as they might 1239 * sleep, for example trying to drain a callout, thus open up the 1240 * theoretical race with re-attaching. 1241 */ 1242 IF_AFDATA_LOCK(ifp); 1243 i = ifp->if_afdata_initialized; 1244 ifp->if_afdata_initialized = 0; 1245 IF_AFDATA_UNLOCK(ifp); 1246 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1247 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1248 (*dp->dom_ifdetach)(ifp, 1249 ifp->if_afdata[dp->dom_family]); 1250 ifp->if_afdata[dp->dom_family] = NULL; 1251 } 1252 } 1253 1254 return (0); 1255 } 1256 1257 #ifdef VIMAGE 1258 /* 1259 * if_vmove() performs a limited version of if_detach() in current 1260 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1261 * An attempt is made to shrink if_index in current vnet, find an 1262 * unused if_index in target vnet and calls if_grow() if necessary, 1263 * and finally find an unused if_xname for the target vnet. 1264 */ 1265 static void 1266 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1267 { 1268 struct if_clone *ifc; 1269 u_int bif_dlt, bif_hdrlen; 1270 void *old; 1271 int rc; 1272 1273 /* 1274 * if_detach_internal() will call the eventhandler to notify 1275 * interface departure. That will detach if_bpf. We need to 1276 * safe the dlt and hdrlen so we can re-attach it later. 1277 */ 1278 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1279 1280 /* 1281 * Detach from current vnet, but preserve LLADDR info, do not 1282 * mark as dead etc. so that the ifnet can be reattached later. 1283 * If we cannot find it, we lost the race to someone else. 1284 */ 1285 rc = if_detach_internal(ifp, 1, &ifc); 1286 if (rc != 0) 1287 return; 1288 1289 /* 1290 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1291 * the if_index for that vnet if possible. 1292 * 1293 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1294 * or we'd lock on one vnet and unlock on another. 1295 */ 1296 IFNET_WLOCK(); 1297 ifindex_free_locked(ifp->if_index); 1298 IFNET_WUNLOCK(); 1299 1300 /* 1301 * Perform interface-specific reassignment tasks, if provided by 1302 * the driver. 1303 */ 1304 if (ifp->if_reassign != NULL) 1305 ifp->if_reassign(ifp, new_vnet, NULL); 1306 1307 /* 1308 * Switch to the context of the target vnet. 1309 */ 1310 CURVNET_SET_QUIET(new_vnet); 1311 restart: 1312 IFNET_WLOCK(); 1313 ifp->if_index = ifindex_alloc(&old); 1314 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1315 IFNET_WUNLOCK(); 1316 epoch_wait_preempt(net_epoch_preempt); 1317 free(old, M_IFNET); 1318 goto restart; 1319 } 1320 ifnet_setbyindex(ifp->if_index, ifp); 1321 IFNET_WUNLOCK(); 1322 1323 if_attach_internal(ifp, 1, ifc); 1324 1325 if (ifp->if_bpf == NULL) 1326 bpfattach(ifp, bif_dlt, bif_hdrlen); 1327 1328 CURVNET_RESTORE(); 1329 } 1330 1331 /* 1332 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1333 */ 1334 static int 1335 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1336 { 1337 struct prison *pr; 1338 struct ifnet *difp; 1339 1340 /* Try to find the prison within our visibility. */ 1341 sx_slock(&allprison_lock); 1342 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1343 sx_sunlock(&allprison_lock); 1344 if (pr == NULL) 1345 return (ENXIO); 1346 prison_hold_locked(pr); 1347 mtx_unlock(&pr->pr_mtx); 1348 1349 /* Do not try to move the iface from and to the same prison. */ 1350 if (pr->pr_vnet == ifp->if_vnet) { 1351 prison_free(pr); 1352 return (EEXIST); 1353 } 1354 1355 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1356 /* XXX Lock interfaces to avoid races. */ 1357 CURVNET_SET_QUIET(pr->pr_vnet); 1358 difp = ifunit(ifname); 1359 if (difp != NULL) { 1360 CURVNET_RESTORE(); 1361 prison_free(pr); 1362 return (EEXIST); 1363 } 1364 1365 /* Make sure the VNET is stable. */ 1366 if (ifp->if_vnet->vnet_shutdown) { 1367 CURVNET_RESTORE(); 1368 prison_free(pr); 1369 return (EBUSY); 1370 } 1371 CURVNET_RESTORE(); 1372 1373 /* Move the interface into the child jail/vnet. */ 1374 if_vmove(ifp, pr->pr_vnet); 1375 1376 /* Report the new if_xname back to the userland. */ 1377 sprintf(ifname, "%s", ifp->if_xname); 1378 1379 prison_free(pr); 1380 return (0); 1381 } 1382 1383 static int 1384 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1385 { 1386 struct prison *pr; 1387 struct vnet *vnet_dst; 1388 struct ifnet *ifp; 1389 1390 /* Try to find the prison within our visibility. */ 1391 sx_slock(&allprison_lock); 1392 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1393 sx_sunlock(&allprison_lock); 1394 if (pr == NULL) 1395 return (ENXIO); 1396 prison_hold_locked(pr); 1397 mtx_unlock(&pr->pr_mtx); 1398 1399 /* Make sure the named iface exists in the source prison/vnet. */ 1400 CURVNET_SET(pr->pr_vnet); 1401 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1402 if (ifp == NULL) { 1403 CURVNET_RESTORE(); 1404 prison_free(pr); 1405 return (ENXIO); 1406 } 1407 1408 /* Do not try to move the iface from and to the same prison. */ 1409 vnet_dst = TD_TO_VNET(td); 1410 if (vnet_dst == ifp->if_vnet) { 1411 CURVNET_RESTORE(); 1412 prison_free(pr); 1413 return (EEXIST); 1414 } 1415 1416 /* Make sure the VNET is stable. */ 1417 if (ifp->if_vnet->vnet_shutdown) { 1418 CURVNET_RESTORE(); 1419 prison_free(pr); 1420 return (EBUSY); 1421 } 1422 1423 /* Get interface back from child jail/vnet. */ 1424 if_vmove(ifp, vnet_dst); 1425 CURVNET_RESTORE(); 1426 1427 /* Report the new if_xname back to the userland. */ 1428 sprintf(ifname, "%s", ifp->if_xname); 1429 1430 prison_free(pr); 1431 return (0); 1432 } 1433 #endif /* VIMAGE */ 1434 1435 /* 1436 * Add a group to an interface 1437 */ 1438 int 1439 if_addgroup(struct ifnet *ifp, const char *groupname) 1440 { 1441 struct ifg_list *ifgl; 1442 struct ifg_group *ifg = NULL; 1443 struct ifg_member *ifgm; 1444 int new = 0; 1445 1446 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1447 groupname[strlen(groupname) - 1] <= '9') 1448 return (EINVAL); 1449 1450 IFNET_WLOCK(); 1451 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1452 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1453 IFNET_WUNLOCK(); 1454 return (EEXIST); 1455 } 1456 1457 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1458 M_NOWAIT)) == NULL) { 1459 IFNET_WUNLOCK(); 1460 return (ENOMEM); 1461 } 1462 1463 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1464 M_TEMP, M_NOWAIT)) == NULL) { 1465 free(ifgl, M_TEMP); 1466 IFNET_WUNLOCK(); 1467 return (ENOMEM); 1468 } 1469 1470 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1471 if (!strcmp(ifg->ifg_group, groupname)) 1472 break; 1473 1474 if (ifg == NULL) { 1475 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1476 M_TEMP, M_NOWAIT)) == NULL) { 1477 free(ifgl, M_TEMP); 1478 free(ifgm, M_TEMP); 1479 IFNET_WUNLOCK(); 1480 return (ENOMEM); 1481 } 1482 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1483 ifg->ifg_refcnt = 0; 1484 CK_STAILQ_INIT(&ifg->ifg_members); 1485 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1486 new = 1; 1487 } 1488 1489 ifg->ifg_refcnt++; 1490 ifgl->ifgl_group = ifg; 1491 ifgm->ifgm_ifp = ifp; 1492 1493 IF_ADDR_WLOCK(ifp); 1494 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1495 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1496 IF_ADDR_WUNLOCK(ifp); 1497 1498 IFNET_WUNLOCK(); 1499 1500 if (new) 1501 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1502 EVENTHANDLER_INVOKE(group_change_event, groupname); 1503 1504 return (0); 1505 } 1506 1507 /* 1508 * Remove a group from an interface 1509 */ 1510 int 1511 if_delgroup(struct ifnet *ifp, const char *groupname) 1512 { 1513 struct ifg_list *ifgl; 1514 struct ifg_member *ifgm; 1515 int freeifgl; 1516 1517 IFNET_WLOCK(); 1518 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1519 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1520 break; 1521 if (ifgl == NULL) { 1522 IFNET_WUNLOCK(); 1523 return (ENOENT); 1524 } 1525 1526 freeifgl = 0; 1527 IF_ADDR_WLOCK(ifp); 1528 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1529 IF_ADDR_WUNLOCK(ifp); 1530 1531 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1532 if (ifgm->ifgm_ifp == ifp) 1533 break; 1534 1535 if (ifgm != NULL) 1536 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next); 1537 1538 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1539 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1540 freeifgl = 1; 1541 } 1542 IFNET_WUNLOCK(); 1543 1544 epoch_wait_preempt(net_epoch_preempt); 1545 if (freeifgl) { 1546 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1547 free(ifgl->ifgl_group, M_TEMP); 1548 } 1549 free(ifgm, M_TEMP); 1550 free(ifgl, M_TEMP); 1551 1552 EVENTHANDLER_INVOKE(group_change_event, groupname); 1553 1554 return (0); 1555 } 1556 1557 /* 1558 * Remove an interface from all groups 1559 */ 1560 static void 1561 if_delgroups(struct ifnet *ifp) 1562 { 1563 struct ifg_list *ifgl; 1564 struct ifg_member *ifgm; 1565 char groupname[IFNAMSIZ]; 1566 int ifglfree; 1567 1568 IFNET_WLOCK(); 1569 while (!CK_STAILQ_EMPTY(&ifp->if_groups)) { 1570 ifgl = CK_STAILQ_FIRST(&ifp->if_groups); 1571 1572 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1573 1574 IF_ADDR_WLOCK(ifp); 1575 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1576 IF_ADDR_WUNLOCK(ifp); 1577 1578 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1579 if (ifgm->ifgm_ifp == ifp) 1580 break; 1581 1582 if (ifgm != NULL) 1583 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, 1584 ifgm_next); 1585 ifglfree = 0; 1586 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1587 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next); 1588 ifglfree = 1; 1589 } 1590 1591 IFNET_WUNLOCK(); 1592 epoch_wait_preempt(net_epoch_preempt); 1593 free(ifgm, M_TEMP); 1594 if (ifglfree) { 1595 EVENTHANDLER_INVOKE(group_detach_event, 1596 ifgl->ifgl_group); 1597 free(ifgl->ifgl_group, M_TEMP); 1598 } 1599 EVENTHANDLER_INVOKE(group_change_event, groupname); 1600 1601 IFNET_WLOCK(); 1602 } 1603 IFNET_WUNLOCK(); 1604 } 1605 1606 static char * 1607 ifgr_group_get(void *ifgrp) 1608 { 1609 union ifgroupreq_union *ifgrup; 1610 1611 ifgrup = ifgrp; 1612 #ifdef COMPAT_FREEBSD32 1613 if (SV_CURPROC_FLAG(SV_ILP32)) 1614 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1615 #endif 1616 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1617 } 1618 1619 static struct ifg_req * 1620 ifgr_groups_get(void *ifgrp) 1621 { 1622 union ifgroupreq_union *ifgrup; 1623 1624 ifgrup = ifgrp; 1625 #ifdef COMPAT_FREEBSD32 1626 if (SV_CURPROC_FLAG(SV_ILP32)) 1627 return ((struct ifg_req *)(uintptr_t) 1628 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1629 #endif 1630 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1631 } 1632 1633 /* 1634 * Stores all groups from an interface in memory pointed to by ifgr. 1635 */ 1636 static int 1637 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1638 { 1639 int len, error; 1640 struct ifg_list *ifgl; 1641 struct ifg_req ifgrq, *ifgp; 1642 1643 NET_EPOCH_ASSERT(); 1644 1645 if (ifgr->ifgr_len == 0) { 1646 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1647 ifgr->ifgr_len += sizeof(struct ifg_req); 1648 return (0); 1649 } 1650 1651 len = ifgr->ifgr_len; 1652 ifgp = ifgr_groups_get(ifgr); 1653 /* XXX: wire */ 1654 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1655 if (len < sizeof(ifgrq)) 1656 return (EINVAL); 1657 bzero(&ifgrq, sizeof ifgrq); 1658 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1659 sizeof(ifgrq.ifgrq_group)); 1660 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) 1661 return (error); 1662 len -= sizeof(ifgrq); 1663 ifgp++; 1664 } 1665 1666 return (0); 1667 } 1668 1669 /* 1670 * Stores all members of a group in memory pointed to by igfr 1671 */ 1672 static int 1673 if_getgroupmembers(struct ifgroupreq *ifgr) 1674 { 1675 struct ifg_group *ifg; 1676 struct ifg_member *ifgm; 1677 struct ifg_req ifgrq, *ifgp; 1678 int len, error; 1679 1680 IFNET_RLOCK(); 1681 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1682 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1683 break; 1684 if (ifg == NULL) { 1685 IFNET_RUNLOCK(); 1686 return (ENOENT); 1687 } 1688 1689 if (ifgr->ifgr_len == 0) { 1690 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1691 ifgr->ifgr_len += sizeof(ifgrq); 1692 IFNET_RUNLOCK(); 1693 return (0); 1694 } 1695 1696 len = ifgr->ifgr_len; 1697 ifgp = ifgr_groups_get(ifgr); 1698 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1699 if (len < sizeof(ifgrq)) { 1700 IFNET_RUNLOCK(); 1701 return (EINVAL); 1702 } 1703 bzero(&ifgrq, sizeof ifgrq); 1704 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1705 sizeof(ifgrq.ifgrq_member)); 1706 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1707 IFNET_RUNLOCK(); 1708 return (error); 1709 } 1710 len -= sizeof(ifgrq); 1711 ifgp++; 1712 } 1713 IFNET_RUNLOCK(); 1714 1715 return (0); 1716 } 1717 1718 /* 1719 * Return counter values from counter(9)s stored in ifnet. 1720 */ 1721 uint64_t 1722 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1723 { 1724 1725 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1726 1727 return (counter_u64_fetch(ifp->if_counters[cnt])); 1728 } 1729 1730 /* 1731 * Increase an ifnet counter. Usually used for counters shared 1732 * between the stack and a driver, but function supports them all. 1733 */ 1734 void 1735 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1736 { 1737 1738 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1739 1740 counter_u64_add(ifp->if_counters[cnt], inc); 1741 } 1742 1743 /* 1744 * Copy data from ifnet to userland API structure if_data. 1745 */ 1746 void 1747 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1748 { 1749 1750 ifd->ifi_type = ifp->if_type; 1751 ifd->ifi_physical = 0; 1752 ifd->ifi_addrlen = ifp->if_addrlen; 1753 ifd->ifi_hdrlen = ifp->if_hdrlen; 1754 ifd->ifi_link_state = ifp->if_link_state; 1755 ifd->ifi_vhid = 0; 1756 ifd->ifi_datalen = sizeof(struct if_data); 1757 ifd->ifi_mtu = ifp->if_mtu; 1758 ifd->ifi_metric = ifp->if_metric; 1759 ifd->ifi_baudrate = ifp->if_baudrate; 1760 ifd->ifi_hwassist = ifp->if_hwassist; 1761 ifd->ifi_epoch = ifp->if_epoch; 1762 ifd->ifi_lastchange = ifp->if_lastchange; 1763 1764 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1765 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1766 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1767 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1768 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1769 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1770 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1771 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1772 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1773 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1774 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1775 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1776 } 1777 1778 /* 1779 * Wrapper functions for struct ifnet address list locking macros. These are 1780 * used by kernel modules to avoid encoding programming interface or binary 1781 * interface assumptions that may be violated when kernel-internal locking 1782 * approaches change. 1783 */ 1784 void 1785 if_addr_rlock(struct ifnet *ifp) 1786 { 1787 1788 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1789 } 1790 1791 void 1792 if_addr_runlock(struct ifnet *ifp) 1793 { 1794 1795 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1796 } 1797 1798 void 1799 if_maddr_rlock(if_t ifp) 1800 { 1801 1802 epoch_enter_preempt(net_epoch_preempt, curthread->td_et); 1803 } 1804 1805 void 1806 if_maddr_runlock(if_t ifp) 1807 { 1808 1809 epoch_exit_preempt(net_epoch_preempt, curthread->td_et); 1810 } 1811 1812 /* 1813 * Initialization, destruction and refcounting functions for ifaddrs. 1814 */ 1815 struct ifaddr * 1816 ifa_alloc(size_t size, int flags) 1817 { 1818 struct ifaddr *ifa; 1819 1820 KASSERT(size >= sizeof(struct ifaddr), 1821 ("%s: invalid size %zu", __func__, size)); 1822 1823 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1824 if (ifa == NULL) 1825 return (NULL); 1826 1827 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1828 goto fail; 1829 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1830 goto fail; 1831 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1832 goto fail; 1833 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1834 goto fail; 1835 1836 refcount_init(&ifa->ifa_refcnt, 1); 1837 1838 return (ifa); 1839 1840 fail: 1841 /* free(NULL) is okay */ 1842 counter_u64_free(ifa->ifa_opackets); 1843 counter_u64_free(ifa->ifa_ipackets); 1844 counter_u64_free(ifa->ifa_obytes); 1845 counter_u64_free(ifa->ifa_ibytes); 1846 free(ifa, M_IFADDR); 1847 1848 return (NULL); 1849 } 1850 1851 void 1852 ifa_ref(struct ifaddr *ifa) 1853 { 1854 1855 refcount_acquire(&ifa->ifa_refcnt); 1856 } 1857 1858 static void 1859 ifa_destroy(epoch_context_t ctx) 1860 { 1861 struct ifaddr *ifa; 1862 1863 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1864 counter_u64_free(ifa->ifa_opackets); 1865 counter_u64_free(ifa->ifa_ipackets); 1866 counter_u64_free(ifa->ifa_obytes); 1867 counter_u64_free(ifa->ifa_ibytes); 1868 free(ifa, M_IFADDR); 1869 } 1870 1871 void 1872 ifa_free(struct ifaddr *ifa) 1873 { 1874 1875 if (refcount_release(&ifa->ifa_refcnt)) 1876 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1877 } 1878 1879 1880 static int 1881 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1882 struct sockaddr *ia) 1883 { 1884 struct epoch_tracker et; 1885 int error; 1886 struct rt_addrinfo info; 1887 struct sockaddr_dl null_sdl; 1888 struct ifnet *ifp; 1889 1890 ifp = ifa->ifa_ifp; 1891 1892 bzero(&info, sizeof(info)); 1893 if (cmd != RTM_DELETE) 1894 info.rti_ifp = V_loif; 1895 if (cmd == RTM_ADD) { 1896 /* explicitly specify (loopback) ifa */ 1897 if (info.rti_ifp != NULL) { 1898 NET_EPOCH_ENTER(et); 1899 info.rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1900 if (info.rti_ifa != NULL) 1901 ifa_ref(info.rti_ifa); 1902 NET_EPOCH_EXIT(et); 1903 } 1904 } 1905 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1906 info.rti_info[RTAX_DST] = ia; 1907 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1908 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1909 1910 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1911 1912 if (error != 0 && 1913 !(cmd == RTM_ADD && error == EEXIST) && 1914 !(cmd == RTM_DELETE && error == ENOENT)) 1915 if_printf(ifp, "%s failed: %d\n", otype, error); 1916 1917 return (error); 1918 } 1919 1920 int 1921 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1922 { 1923 1924 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1925 } 1926 1927 int 1928 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1929 { 1930 1931 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1932 } 1933 1934 int 1935 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1936 { 1937 1938 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1939 } 1940 1941 /* 1942 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1943 * structs used to represent other address families, it is necessary 1944 * to perform a different comparison. 1945 */ 1946 1947 #define sa_dl_equal(a1, a2) \ 1948 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1949 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1950 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1951 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1952 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1953 1954 /* 1955 * Locate an interface based on a complete address. 1956 */ 1957 /*ARGSUSED*/ 1958 struct ifaddr * 1959 ifa_ifwithaddr(const struct sockaddr *addr) 1960 { 1961 struct ifnet *ifp; 1962 struct ifaddr *ifa; 1963 1964 NET_EPOCH_ASSERT(); 1965 1966 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1967 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1968 if (ifa->ifa_addr->sa_family != addr->sa_family) 1969 continue; 1970 if (sa_equal(addr, ifa->ifa_addr)) { 1971 goto done; 1972 } 1973 /* IP6 doesn't have broadcast */ 1974 if ((ifp->if_flags & IFF_BROADCAST) && 1975 ifa->ifa_broadaddr && 1976 ifa->ifa_broadaddr->sa_len != 0 && 1977 sa_equal(ifa->ifa_broadaddr, addr)) { 1978 goto done; 1979 } 1980 } 1981 } 1982 ifa = NULL; 1983 done: 1984 return (ifa); 1985 } 1986 1987 int 1988 ifa_ifwithaddr_check(const struct sockaddr *addr) 1989 { 1990 struct epoch_tracker et; 1991 int rc; 1992 1993 NET_EPOCH_ENTER(et); 1994 rc = (ifa_ifwithaddr(addr) != NULL); 1995 NET_EPOCH_EXIT(et); 1996 return (rc); 1997 } 1998 1999 /* 2000 * Locate an interface based on the broadcast address. 2001 */ 2002 /* ARGSUSED */ 2003 struct ifaddr * 2004 ifa_ifwithbroadaddr(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 ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2012 continue; 2013 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2014 if (ifa->ifa_addr->sa_family != addr->sa_family) 2015 continue; 2016 if ((ifp->if_flags & IFF_BROADCAST) && 2017 ifa->ifa_broadaddr && 2018 ifa->ifa_broadaddr->sa_len != 0 && 2019 sa_equal(ifa->ifa_broadaddr, addr)) { 2020 goto done; 2021 } 2022 } 2023 } 2024 ifa = NULL; 2025 done: 2026 return (ifa); 2027 } 2028 2029 /* 2030 * Locate the point to point interface with a given destination address. 2031 */ 2032 /*ARGSUSED*/ 2033 struct ifaddr * 2034 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2035 { 2036 struct ifnet *ifp; 2037 struct ifaddr *ifa; 2038 2039 MPASS(in_epoch(net_epoch_preempt)); 2040 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2041 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2042 continue; 2043 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2044 continue; 2045 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2046 if (ifa->ifa_addr->sa_family != addr->sa_family) 2047 continue; 2048 if (ifa->ifa_dstaddr != NULL && 2049 sa_equal(addr, ifa->ifa_dstaddr)) { 2050 goto done; 2051 } 2052 } 2053 } 2054 ifa = NULL; 2055 done: 2056 return (ifa); 2057 } 2058 2059 /* 2060 * Find an interface on a specific network. If many, choice 2061 * is most specific found. 2062 */ 2063 struct ifaddr * 2064 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2065 { 2066 struct ifnet *ifp; 2067 struct ifaddr *ifa; 2068 struct ifaddr *ifa_maybe = NULL; 2069 u_int af = addr->sa_family; 2070 const char *addr_data = addr->sa_data, *cplim; 2071 2072 MPASS(in_epoch(net_epoch_preempt)); 2073 /* 2074 * AF_LINK addresses can be looked up directly by their index number, 2075 * so do that if we can. 2076 */ 2077 if (af == AF_LINK) { 2078 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2079 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2080 return (ifaddr_byindex(sdl->sdl_index)); 2081 } 2082 2083 /* 2084 * Scan though each interface, looking for ones that have addresses 2085 * in this address family and the requested fib. 2086 */ 2087 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2088 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2089 continue; 2090 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2091 const char *cp, *cp2, *cp3; 2092 2093 if (ifa->ifa_addr->sa_family != af) 2094 next: continue; 2095 if (af == AF_INET && 2096 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2097 /* 2098 * This is a bit broken as it doesn't 2099 * take into account that the remote end may 2100 * be a single node in the network we are 2101 * looking for. 2102 * The trouble is that we don't know the 2103 * netmask for the remote end. 2104 */ 2105 if (ifa->ifa_dstaddr != NULL && 2106 sa_equal(addr, ifa->ifa_dstaddr)) { 2107 goto done; 2108 } 2109 } else { 2110 /* 2111 * Scan all the bits in the ifa's address. 2112 * If a bit dissagrees with what we are 2113 * looking for, mask it with the netmask 2114 * to see if it really matters. 2115 * (A byte at a time) 2116 */ 2117 if (ifa->ifa_netmask == 0) 2118 continue; 2119 cp = addr_data; 2120 cp2 = ifa->ifa_addr->sa_data; 2121 cp3 = ifa->ifa_netmask->sa_data; 2122 cplim = ifa->ifa_netmask->sa_len 2123 + (char *)ifa->ifa_netmask; 2124 while (cp3 < cplim) 2125 if ((*cp++ ^ *cp2++) & *cp3++) 2126 goto next; /* next address! */ 2127 /* 2128 * If the netmask of what we just found 2129 * is more specific than what we had before 2130 * (if we had one), or if the virtual status 2131 * of new prefix is better than of the old one, 2132 * then remember the new one before continuing 2133 * to search for an even better one. 2134 */ 2135 if (ifa_maybe == NULL || 2136 ifa_preferred(ifa_maybe, ifa) || 2137 rn_refines((caddr_t)ifa->ifa_netmask, 2138 (caddr_t)ifa_maybe->ifa_netmask)) { 2139 ifa_maybe = ifa; 2140 } 2141 } 2142 } 2143 } 2144 ifa = ifa_maybe; 2145 ifa_maybe = NULL; 2146 done: 2147 return (ifa); 2148 } 2149 2150 /* 2151 * Find an interface address specific to an interface best matching 2152 * a given address. 2153 */ 2154 struct ifaddr * 2155 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2156 { 2157 struct ifaddr *ifa; 2158 const char *cp, *cp2, *cp3; 2159 char *cplim; 2160 struct ifaddr *ifa_maybe = NULL; 2161 u_int af = addr->sa_family; 2162 2163 if (af >= AF_MAX) 2164 return (NULL); 2165 2166 MPASS(in_epoch(net_epoch_preempt)); 2167 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2168 if (ifa->ifa_addr->sa_family != af) 2169 continue; 2170 if (ifa_maybe == NULL) 2171 ifa_maybe = ifa; 2172 if (ifa->ifa_netmask == 0) { 2173 if (sa_equal(addr, ifa->ifa_addr) || 2174 (ifa->ifa_dstaddr && 2175 sa_equal(addr, ifa->ifa_dstaddr))) 2176 goto done; 2177 continue; 2178 } 2179 if (ifp->if_flags & IFF_POINTOPOINT) { 2180 if (sa_equal(addr, ifa->ifa_dstaddr)) 2181 goto done; 2182 } else { 2183 cp = addr->sa_data; 2184 cp2 = ifa->ifa_addr->sa_data; 2185 cp3 = ifa->ifa_netmask->sa_data; 2186 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2187 for (; cp3 < cplim; cp3++) 2188 if ((*cp++ ^ *cp2++) & *cp3) 2189 break; 2190 if (cp3 == cplim) 2191 goto done; 2192 } 2193 } 2194 ifa = ifa_maybe; 2195 done: 2196 return (ifa); 2197 } 2198 2199 /* 2200 * See whether new ifa is better than current one: 2201 * 1) A non-virtual one is preferred over virtual. 2202 * 2) A virtual in master state preferred over any other state. 2203 * 2204 * Used in several address selecting functions. 2205 */ 2206 int 2207 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2208 { 2209 2210 return (cur->ifa_carp && (!next->ifa_carp || 2211 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2212 } 2213 2214 struct sockaddr_dl * 2215 link_alloc_sdl(size_t size, int flags) 2216 { 2217 2218 return (malloc(size, M_TEMP, flags)); 2219 } 2220 2221 void 2222 link_free_sdl(struct sockaddr *sa) 2223 { 2224 free(sa, M_TEMP); 2225 } 2226 2227 /* 2228 * Fills in given sdl with interface basic info. 2229 * Returns pointer to filled sdl. 2230 */ 2231 struct sockaddr_dl * 2232 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2233 { 2234 struct sockaddr_dl *sdl; 2235 2236 sdl = (struct sockaddr_dl *)paddr; 2237 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2238 sdl->sdl_len = sizeof(struct sockaddr_dl); 2239 sdl->sdl_family = AF_LINK; 2240 sdl->sdl_index = ifp->if_index; 2241 sdl->sdl_type = iftype; 2242 2243 return (sdl); 2244 } 2245 2246 /* 2247 * Mark an interface down and notify protocols of 2248 * the transition. 2249 */ 2250 static void 2251 if_unroute(struct ifnet *ifp, int flag, int fam) 2252 { 2253 struct ifaddr *ifa; 2254 2255 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2256 2257 ifp->if_flags &= ~flag; 2258 getmicrotime(&ifp->if_lastchange); 2259 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2260 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2261 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2262 ifp->if_qflush(ifp); 2263 2264 if (ifp->if_carp) 2265 (*carp_linkstate_p)(ifp); 2266 rt_ifmsg(ifp); 2267 } 2268 2269 /* 2270 * Mark an interface up and notify protocols of 2271 * the transition. 2272 */ 2273 static void 2274 if_route(struct ifnet *ifp, int flag, int fam) 2275 { 2276 struct ifaddr *ifa; 2277 2278 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2279 2280 ifp->if_flags |= flag; 2281 getmicrotime(&ifp->if_lastchange); 2282 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2283 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2284 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2285 if (ifp->if_carp) 2286 (*carp_linkstate_p)(ifp); 2287 rt_ifmsg(ifp); 2288 #ifdef INET6 2289 in6_if_up(ifp); 2290 #endif 2291 } 2292 2293 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2294 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2295 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2296 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2297 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2298 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2299 int (*vlan_setcookie_p)(struct ifnet *, void *); 2300 void *(*vlan_cookie_p)(struct ifnet *); 2301 2302 /* 2303 * Handle a change in the interface link state. To avoid LORs 2304 * between driver lock and upper layer locks, as well as possible 2305 * recursions, we post event to taskqueue, and all job 2306 * is done in static do_link_state_change(). 2307 */ 2308 void 2309 if_link_state_change(struct ifnet *ifp, int link_state) 2310 { 2311 /* Return if state hasn't changed. */ 2312 if (ifp->if_link_state == link_state) 2313 return; 2314 2315 ifp->if_link_state = link_state; 2316 2317 /* XXXGL: reference ifp? */ 2318 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2319 } 2320 2321 static void 2322 do_link_state_change(void *arg, int pending) 2323 { 2324 struct epoch_tracker et; 2325 struct ifnet *ifp; 2326 int link_state; 2327 2328 NET_EPOCH_ENTER(et); 2329 ifp = arg; 2330 link_state = ifp->if_link_state; 2331 2332 CURVNET_SET(ifp->if_vnet); 2333 rt_ifmsg(ifp); 2334 if (ifp->if_vlantrunk != NULL) 2335 (*vlan_link_state_p)(ifp); 2336 2337 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2338 ifp->if_l2com != NULL) 2339 (*ng_ether_link_state_p)(ifp, link_state); 2340 if (ifp->if_carp) 2341 (*carp_linkstate_p)(ifp); 2342 if (ifp->if_bridge) 2343 ifp->if_bridge_linkstate(ifp); 2344 if (ifp->if_lagg) 2345 (*lagg_linkstate_p)(ifp, link_state); 2346 2347 if (IS_DEFAULT_VNET(curvnet)) 2348 devctl_notify("IFNET", ifp->if_xname, 2349 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2350 NULL); 2351 if (pending > 1) 2352 if_printf(ifp, "%d link states coalesced\n", pending); 2353 if (log_link_state_change) 2354 if_printf(ifp, "link state changed to %s\n", 2355 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2356 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2357 CURVNET_RESTORE(); 2358 NET_EPOCH_EXIT(et); 2359 } 2360 2361 /* 2362 * Mark an interface down and notify protocols of 2363 * the transition. 2364 */ 2365 void 2366 if_down(struct ifnet *ifp) 2367 { 2368 2369 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2370 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2371 } 2372 2373 /* 2374 * Mark an interface up and notify protocols of 2375 * the transition. 2376 */ 2377 void 2378 if_up(struct ifnet *ifp) 2379 { 2380 2381 if_route(ifp, IFF_UP, AF_UNSPEC); 2382 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2383 } 2384 2385 /* 2386 * Flush an interface queue. 2387 */ 2388 void 2389 if_qflush(struct ifnet *ifp) 2390 { 2391 struct mbuf *m, *n; 2392 struct ifaltq *ifq; 2393 2394 ifq = &ifp->if_snd; 2395 IFQ_LOCK(ifq); 2396 #ifdef ALTQ 2397 if (ALTQ_IS_ENABLED(ifq)) 2398 ALTQ_PURGE(ifq); 2399 #endif 2400 n = ifq->ifq_head; 2401 while ((m = n) != NULL) { 2402 n = m->m_nextpkt; 2403 m_freem(m); 2404 } 2405 ifq->ifq_head = 0; 2406 ifq->ifq_tail = 0; 2407 ifq->ifq_len = 0; 2408 IFQ_UNLOCK(ifq); 2409 } 2410 2411 /* 2412 * Map interface name to interface structure pointer, with or without 2413 * returning a reference. 2414 */ 2415 struct ifnet * 2416 ifunit_ref(const char *name) 2417 { 2418 struct epoch_tracker et; 2419 struct ifnet *ifp; 2420 2421 NET_EPOCH_ENTER(et); 2422 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2423 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2424 !(ifp->if_flags & IFF_DYING)) 2425 break; 2426 } 2427 if (ifp != NULL) 2428 if_ref(ifp); 2429 NET_EPOCH_EXIT(et); 2430 return (ifp); 2431 } 2432 2433 struct ifnet * 2434 ifunit(const char *name) 2435 { 2436 struct epoch_tracker et; 2437 struct ifnet *ifp; 2438 2439 NET_EPOCH_ENTER(et); 2440 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2441 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2442 break; 2443 } 2444 NET_EPOCH_EXIT(et); 2445 return (ifp); 2446 } 2447 2448 static void * 2449 ifr_buffer_get_buffer(void *data) 2450 { 2451 union ifreq_union *ifrup; 2452 2453 ifrup = data; 2454 #ifdef COMPAT_FREEBSD32 2455 if (SV_CURPROC_FLAG(SV_ILP32)) 2456 return ((void *)(uintptr_t) 2457 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2458 #endif 2459 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2460 } 2461 2462 static void 2463 ifr_buffer_set_buffer_null(void *data) 2464 { 2465 union ifreq_union *ifrup; 2466 2467 ifrup = data; 2468 #ifdef COMPAT_FREEBSD32 2469 if (SV_CURPROC_FLAG(SV_ILP32)) 2470 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2471 else 2472 #endif 2473 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2474 } 2475 2476 static size_t 2477 ifr_buffer_get_length(void *data) 2478 { 2479 union ifreq_union *ifrup; 2480 2481 ifrup = data; 2482 #ifdef COMPAT_FREEBSD32 2483 if (SV_CURPROC_FLAG(SV_ILP32)) 2484 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2485 #endif 2486 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2487 } 2488 2489 static void 2490 ifr_buffer_set_length(void *data, size_t len) 2491 { 2492 union ifreq_union *ifrup; 2493 2494 ifrup = data; 2495 #ifdef COMPAT_FREEBSD32 2496 if (SV_CURPROC_FLAG(SV_ILP32)) 2497 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2498 else 2499 #endif 2500 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2501 } 2502 2503 void * 2504 ifr_data_get_ptr(void *ifrp) 2505 { 2506 union ifreq_union *ifrup; 2507 2508 ifrup = ifrp; 2509 #ifdef COMPAT_FREEBSD32 2510 if (SV_CURPROC_FLAG(SV_ILP32)) 2511 return ((void *)(uintptr_t) 2512 ifrup->ifr32.ifr_ifru.ifru_data); 2513 #endif 2514 return (ifrup->ifr.ifr_ifru.ifru_data); 2515 } 2516 2517 /* 2518 * Hardware specific interface ioctls. 2519 */ 2520 int 2521 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2522 { 2523 struct ifreq *ifr; 2524 int error = 0, do_ifup = 0; 2525 int new_flags, temp_flags; 2526 size_t namelen, onamelen; 2527 size_t descrlen; 2528 char *descrbuf, *odescrbuf; 2529 char new_name[IFNAMSIZ]; 2530 struct ifaddr *ifa; 2531 struct sockaddr_dl *sdl; 2532 2533 ifr = (struct ifreq *)data; 2534 switch (cmd) { 2535 case SIOCGIFINDEX: 2536 ifr->ifr_index = ifp->if_index; 2537 break; 2538 2539 case SIOCGIFFLAGS: 2540 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2541 ifr->ifr_flags = temp_flags & 0xffff; 2542 ifr->ifr_flagshigh = temp_flags >> 16; 2543 break; 2544 2545 case SIOCGIFCAP: 2546 ifr->ifr_reqcap = ifp->if_capabilities; 2547 ifr->ifr_curcap = ifp->if_capenable; 2548 break; 2549 2550 #ifdef MAC 2551 case SIOCGIFMAC: 2552 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2553 break; 2554 #endif 2555 2556 case SIOCGIFMETRIC: 2557 ifr->ifr_metric = ifp->if_metric; 2558 break; 2559 2560 case SIOCGIFMTU: 2561 ifr->ifr_mtu = ifp->if_mtu; 2562 break; 2563 2564 case SIOCGIFPHYS: 2565 /* XXXGL: did this ever worked? */ 2566 ifr->ifr_phys = 0; 2567 break; 2568 2569 case SIOCGIFDESCR: 2570 error = 0; 2571 sx_slock(&ifdescr_sx); 2572 if (ifp->if_description == NULL) 2573 error = ENOMSG; 2574 else { 2575 /* space for terminating nul */ 2576 descrlen = strlen(ifp->if_description) + 1; 2577 if (ifr_buffer_get_length(ifr) < descrlen) 2578 ifr_buffer_set_buffer_null(ifr); 2579 else 2580 error = copyout(ifp->if_description, 2581 ifr_buffer_get_buffer(ifr), descrlen); 2582 ifr_buffer_set_length(ifr, descrlen); 2583 } 2584 sx_sunlock(&ifdescr_sx); 2585 break; 2586 2587 case SIOCSIFDESCR: 2588 error = priv_check(td, PRIV_NET_SETIFDESCR); 2589 if (error) 2590 return (error); 2591 2592 /* 2593 * Copy only (length-1) bytes to make sure that 2594 * if_description is always nul terminated. The 2595 * length parameter is supposed to count the 2596 * terminating nul in. 2597 */ 2598 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2599 return (ENAMETOOLONG); 2600 else if (ifr_buffer_get_length(ifr) == 0) 2601 descrbuf = NULL; 2602 else { 2603 descrbuf = malloc(ifr_buffer_get_length(ifr), 2604 M_IFDESCR, M_WAITOK | M_ZERO); 2605 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2606 ifr_buffer_get_length(ifr) - 1); 2607 if (error) { 2608 free(descrbuf, M_IFDESCR); 2609 break; 2610 } 2611 } 2612 2613 sx_xlock(&ifdescr_sx); 2614 odescrbuf = ifp->if_description; 2615 ifp->if_description = descrbuf; 2616 sx_xunlock(&ifdescr_sx); 2617 2618 getmicrotime(&ifp->if_lastchange); 2619 free(odescrbuf, M_IFDESCR); 2620 break; 2621 2622 case SIOCGIFFIB: 2623 ifr->ifr_fib = ifp->if_fib; 2624 break; 2625 2626 case SIOCSIFFIB: 2627 error = priv_check(td, PRIV_NET_SETIFFIB); 2628 if (error) 2629 return (error); 2630 if (ifr->ifr_fib >= rt_numfibs) 2631 return (EINVAL); 2632 2633 ifp->if_fib = ifr->ifr_fib; 2634 break; 2635 2636 case SIOCSIFFLAGS: 2637 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2638 if (error) 2639 return (error); 2640 /* 2641 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2642 * check, so we don't need special handling here yet. 2643 */ 2644 new_flags = (ifr->ifr_flags & 0xffff) | 2645 (ifr->ifr_flagshigh << 16); 2646 if (ifp->if_flags & IFF_UP && 2647 (new_flags & IFF_UP) == 0) { 2648 if_down(ifp); 2649 } else if (new_flags & IFF_UP && 2650 (ifp->if_flags & IFF_UP) == 0) { 2651 do_ifup = 1; 2652 } 2653 /* See if permanently promiscuous mode bit is about to flip */ 2654 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2655 if (new_flags & IFF_PPROMISC) 2656 ifp->if_flags |= IFF_PROMISC; 2657 else if (ifp->if_pcount == 0) 2658 ifp->if_flags &= ~IFF_PROMISC; 2659 if (log_promisc_mode_change) 2660 if_printf(ifp, "permanently promiscuous mode %s\n", 2661 ((new_flags & IFF_PPROMISC) ? 2662 "enabled" : "disabled")); 2663 } 2664 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2665 (new_flags &~ IFF_CANTCHANGE); 2666 if (ifp->if_ioctl) { 2667 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2668 } 2669 if (do_ifup) 2670 if_up(ifp); 2671 getmicrotime(&ifp->if_lastchange); 2672 break; 2673 2674 case SIOCSIFCAP: 2675 error = priv_check(td, PRIV_NET_SETIFCAP); 2676 if (error) 2677 return (error); 2678 if (ifp->if_ioctl == NULL) 2679 return (EOPNOTSUPP); 2680 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2681 return (EINVAL); 2682 error = (*ifp->if_ioctl)(ifp, cmd, data); 2683 if (error == 0) 2684 getmicrotime(&ifp->if_lastchange); 2685 break; 2686 2687 #ifdef MAC 2688 case SIOCSIFMAC: 2689 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2690 break; 2691 #endif 2692 2693 case SIOCSIFNAME: 2694 error = priv_check(td, PRIV_NET_SETIFNAME); 2695 if (error) 2696 return (error); 2697 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2698 NULL); 2699 if (error != 0) 2700 return (error); 2701 if (new_name[0] == '\0') 2702 return (EINVAL); 2703 if (new_name[IFNAMSIZ-1] != '\0') { 2704 new_name[IFNAMSIZ-1] = '\0'; 2705 if (strlen(new_name) == IFNAMSIZ-1) 2706 return (EINVAL); 2707 } 2708 if (strcmp(new_name, ifp->if_xname) == 0) 2709 break; 2710 if (ifunit(new_name) != NULL) 2711 return (EEXIST); 2712 2713 /* 2714 * XXX: Locking. Nothing else seems to lock if_flags, 2715 * and there are numerous other races with the 2716 * ifunit() checks not being atomic with namespace 2717 * changes (renames, vmoves, if_attach, etc). 2718 */ 2719 ifp->if_flags |= IFF_RENAMING; 2720 2721 /* Announce the departure of the interface. */ 2722 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2723 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2724 2725 if_printf(ifp, "changing name to '%s'\n", new_name); 2726 2727 IF_ADDR_WLOCK(ifp); 2728 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2729 ifa = ifp->if_addr; 2730 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2731 namelen = strlen(new_name); 2732 onamelen = sdl->sdl_nlen; 2733 /* 2734 * Move the address if needed. This is safe because we 2735 * allocate space for a name of length IFNAMSIZ when we 2736 * create this in if_attach(). 2737 */ 2738 if (namelen != onamelen) { 2739 bcopy(sdl->sdl_data + onamelen, 2740 sdl->sdl_data + namelen, sdl->sdl_alen); 2741 } 2742 bcopy(new_name, sdl->sdl_data, namelen); 2743 sdl->sdl_nlen = namelen; 2744 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2745 bzero(sdl->sdl_data, onamelen); 2746 while (namelen != 0) 2747 sdl->sdl_data[--namelen] = 0xff; 2748 IF_ADDR_WUNLOCK(ifp); 2749 2750 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2751 /* Announce the return of the interface. */ 2752 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2753 2754 ifp->if_flags &= ~IFF_RENAMING; 2755 break; 2756 2757 #ifdef VIMAGE 2758 case SIOCSIFVNET: 2759 error = priv_check(td, PRIV_NET_SETIFVNET); 2760 if (error) 2761 return (error); 2762 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2763 break; 2764 #endif 2765 2766 case SIOCSIFMETRIC: 2767 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2768 if (error) 2769 return (error); 2770 ifp->if_metric = ifr->ifr_metric; 2771 getmicrotime(&ifp->if_lastchange); 2772 break; 2773 2774 case SIOCSIFPHYS: 2775 error = priv_check(td, PRIV_NET_SETIFPHYS); 2776 if (error) 2777 return (error); 2778 if (ifp->if_ioctl == NULL) 2779 return (EOPNOTSUPP); 2780 error = (*ifp->if_ioctl)(ifp, cmd, data); 2781 if (error == 0) 2782 getmicrotime(&ifp->if_lastchange); 2783 break; 2784 2785 case SIOCSIFMTU: 2786 { 2787 u_long oldmtu = ifp->if_mtu; 2788 2789 error = priv_check(td, PRIV_NET_SETIFMTU); 2790 if (error) 2791 return (error); 2792 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2793 return (EINVAL); 2794 if (ifp->if_ioctl == NULL) 2795 return (EOPNOTSUPP); 2796 error = (*ifp->if_ioctl)(ifp, cmd, data); 2797 if (error == 0) { 2798 getmicrotime(&ifp->if_lastchange); 2799 rt_ifmsg(ifp); 2800 #ifdef INET 2801 NETDUMP_REINIT(ifp); 2802 #endif 2803 } 2804 /* 2805 * If the link MTU changed, do network layer specific procedure. 2806 */ 2807 if (ifp->if_mtu != oldmtu) { 2808 #ifdef INET6 2809 nd6_setmtu(ifp); 2810 #endif 2811 rt_updatemtu(ifp); 2812 } 2813 break; 2814 } 2815 2816 case SIOCADDMULTI: 2817 case SIOCDELMULTI: 2818 if (cmd == SIOCADDMULTI) 2819 error = priv_check(td, PRIV_NET_ADDMULTI); 2820 else 2821 error = priv_check(td, PRIV_NET_DELMULTI); 2822 if (error) 2823 return (error); 2824 2825 /* Don't allow group membership on non-multicast interfaces. */ 2826 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2827 return (EOPNOTSUPP); 2828 2829 /* Don't let users screw up protocols' entries. */ 2830 if (ifr->ifr_addr.sa_family != AF_LINK) 2831 return (EINVAL); 2832 2833 if (cmd == SIOCADDMULTI) { 2834 struct epoch_tracker et; 2835 struct ifmultiaddr *ifma; 2836 2837 /* 2838 * Userland is only permitted to join groups once 2839 * via the if_addmulti() KPI, because it cannot hold 2840 * struct ifmultiaddr * between calls. It may also 2841 * lose a race while we check if the membership 2842 * already exists. 2843 */ 2844 NET_EPOCH_ENTER(et); 2845 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2846 NET_EPOCH_EXIT(et); 2847 if (ifma != NULL) 2848 error = EADDRINUSE; 2849 else 2850 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2851 } else { 2852 error = if_delmulti(ifp, &ifr->ifr_addr); 2853 } 2854 if (error == 0) 2855 getmicrotime(&ifp->if_lastchange); 2856 break; 2857 2858 case SIOCSIFPHYADDR: 2859 case SIOCDIFPHYADDR: 2860 #ifdef INET6 2861 case SIOCSIFPHYADDR_IN6: 2862 #endif 2863 case SIOCSIFMEDIA: 2864 case SIOCSIFGENERIC: 2865 error = priv_check(td, PRIV_NET_HWIOCTL); 2866 if (error) 2867 return (error); 2868 if (ifp->if_ioctl == NULL) 2869 return (EOPNOTSUPP); 2870 error = (*ifp->if_ioctl)(ifp, cmd, data); 2871 if (error == 0) 2872 getmicrotime(&ifp->if_lastchange); 2873 break; 2874 2875 case SIOCGIFSTATUS: 2876 case SIOCGIFPSRCADDR: 2877 case SIOCGIFPDSTADDR: 2878 case SIOCGIFMEDIA: 2879 case SIOCGIFXMEDIA: 2880 case SIOCGIFGENERIC: 2881 case SIOCGIFRSSKEY: 2882 case SIOCGIFRSSHASH: 2883 case SIOCGIFDOWNREASON: 2884 if (ifp->if_ioctl == NULL) 2885 return (EOPNOTSUPP); 2886 error = (*ifp->if_ioctl)(ifp, cmd, data); 2887 break; 2888 2889 case SIOCSIFLLADDR: 2890 error = priv_check(td, PRIV_NET_SETLLADDR); 2891 if (error) 2892 return (error); 2893 error = if_setlladdr(ifp, 2894 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2895 break; 2896 2897 case SIOCGHWADDR: 2898 error = if_gethwaddr(ifp, ifr); 2899 break; 2900 2901 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2902 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2903 if (error) 2904 return (error); 2905 if ((error = if_addgroup(ifp, 2906 ifgr_group_get((struct ifgroupreq *)data)))) 2907 return (error); 2908 break; 2909 2910 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2911 { 2912 struct epoch_tracker et; 2913 2914 NET_EPOCH_ENTER(et); 2915 error = if_getgroup((struct ifgroupreq *)data, ifp); 2916 NET_EPOCH_EXIT(et); 2917 break; 2918 } 2919 2920 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2921 error = priv_check(td, PRIV_NET_DELIFGROUP); 2922 if (error) 2923 return (error); 2924 if ((error = if_delgroup(ifp, 2925 ifgr_group_get((struct ifgroupreq *)data)))) 2926 return (error); 2927 break; 2928 2929 default: 2930 error = ENOIOCTL; 2931 break; 2932 } 2933 return (error); 2934 } 2935 2936 #ifdef COMPAT_FREEBSD32 2937 struct ifconf32 { 2938 int32_t ifc_len; 2939 union { 2940 uint32_t ifcu_buf; 2941 uint32_t ifcu_req; 2942 } ifc_ifcu; 2943 }; 2944 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2945 #endif 2946 2947 #ifdef COMPAT_FREEBSD32 2948 static void 2949 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2950 { 2951 struct ifmediareq32 *ifmr32; 2952 2953 ifmr32 = (struct ifmediareq32 *)data; 2954 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2955 sizeof(ifmr->ifm_name)); 2956 ifmr->ifm_current = ifmr32->ifm_current; 2957 ifmr->ifm_mask = ifmr32->ifm_mask; 2958 ifmr->ifm_status = ifmr32->ifm_status; 2959 ifmr->ifm_active = ifmr32->ifm_active; 2960 ifmr->ifm_count = ifmr32->ifm_count; 2961 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2962 } 2963 2964 static void 2965 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2966 { 2967 struct ifmediareq32 *ifmr32; 2968 2969 ifmr32 = (struct ifmediareq32 *)data; 2970 ifmr32->ifm_current = ifmr->ifm_current; 2971 ifmr32->ifm_mask = ifmr->ifm_mask; 2972 ifmr32->ifm_status = ifmr->ifm_status; 2973 ifmr32->ifm_active = ifmr->ifm_active; 2974 ifmr32->ifm_count = ifmr->ifm_count; 2975 } 2976 #endif 2977 2978 /* 2979 * Interface ioctls. 2980 */ 2981 int 2982 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2983 { 2984 #ifdef COMPAT_FREEBSD32 2985 caddr_t saved_data = NULL; 2986 struct ifmediareq ifmr; 2987 struct ifmediareq *ifmrp = NULL; 2988 #endif 2989 struct ifnet *ifp; 2990 struct ifreq *ifr; 2991 int error; 2992 int oif_flags; 2993 2994 CURVNET_SET(so->so_vnet); 2995 #ifdef VIMAGE 2996 /* Make sure the VNET is stable. */ 2997 if (so->so_vnet->vnet_shutdown) { 2998 CURVNET_RESTORE(); 2999 return (EBUSY); 3000 } 3001 #endif 3002 3003 switch (cmd) { 3004 case SIOCGIFCONF: 3005 error = ifconf(cmd, data); 3006 goto out_noref; 3007 3008 #ifdef COMPAT_FREEBSD32 3009 case SIOCGIFCONF32: 3010 { 3011 struct ifconf32 *ifc32; 3012 struct ifconf ifc; 3013 3014 ifc32 = (struct ifconf32 *)data; 3015 ifc.ifc_len = ifc32->ifc_len; 3016 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3017 3018 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3019 if (error == 0) 3020 ifc32->ifc_len = ifc.ifc_len; 3021 goto out_noref; 3022 } 3023 #endif 3024 } 3025 3026 #ifdef COMPAT_FREEBSD32 3027 switch (cmd) { 3028 case SIOCGIFMEDIA32: 3029 case SIOCGIFXMEDIA32: 3030 ifmrp = &ifmr; 3031 ifmr_init(ifmrp, data); 3032 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3033 saved_data = data; 3034 data = (caddr_t)ifmrp; 3035 } 3036 #endif 3037 3038 ifr = (struct ifreq *)data; 3039 switch (cmd) { 3040 #ifdef VIMAGE 3041 case SIOCSIFRVNET: 3042 error = priv_check(td, PRIV_NET_SETIFVNET); 3043 if (error == 0) 3044 error = if_vmove_reclaim(td, ifr->ifr_name, 3045 ifr->ifr_jid); 3046 goto out_noref; 3047 #endif 3048 case SIOCIFCREATE: 3049 case SIOCIFCREATE2: 3050 error = priv_check(td, PRIV_NET_IFCREATE); 3051 if (error == 0) 3052 error = if_clone_create(ifr->ifr_name, 3053 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3054 ifr_data_get_ptr(ifr) : NULL); 3055 goto out_noref; 3056 case SIOCIFDESTROY: 3057 error = priv_check(td, PRIV_NET_IFDESTROY); 3058 if (error == 0) 3059 error = if_clone_destroy(ifr->ifr_name); 3060 goto out_noref; 3061 3062 case SIOCIFGCLONERS: 3063 error = if_clone_list((struct if_clonereq *)data); 3064 goto out_noref; 3065 3066 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3067 error = if_getgroupmembers((struct ifgroupreq *)data); 3068 goto out_noref; 3069 3070 #if defined(INET) || defined(INET6) 3071 case SIOCSVH: 3072 case SIOCGVH: 3073 if (carp_ioctl_p == NULL) 3074 error = EPROTONOSUPPORT; 3075 else 3076 error = (*carp_ioctl_p)(ifr, cmd, td); 3077 goto out_noref; 3078 #endif 3079 } 3080 3081 ifp = ifunit_ref(ifr->ifr_name); 3082 if (ifp == NULL) { 3083 error = ENXIO; 3084 goto out_noref; 3085 } 3086 3087 error = ifhwioctl(cmd, ifp, data, td); 3088 if (error != ENOIOCTL) 3089 goto out_ref; 3090 3091 oif_flags = ifp->if_flags; 3092 if (so->so_proto == NULL) { 3093 error = EOPNOTSUPP; 3094 goto out_ref; 3095 } 3096 3097 /* 3098 * Pass the request on to the socket control method, and if the 3099 * latter returns EOPNOTSUPP, directly to the interface. 3100 * 3101 * Make an exception for the legacy SIOCSIF* requests. Drivers 3102 * trust SIOCSIFADDR et al to come from an already privileged 3103 * layer, and do not perform any credentials checks or input 3104 * validation. 3105 */ 3106 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3107 ifp, td)); 3108 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3109 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3110 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3111 error = (*ifp->if_ioctl)(ifp, cmd, data); 3112 3113 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3114 #ifdef INET6 3115 if (ifp->if_flags & IFF_UP) 3116 in6_if_up(ifp); 3117 #endif 3118 } 3119 3120 out_ref: 3121 if_rele(ifp); 3122 out_noref: 3123 #ifdef COMPAT_FREEBSD32 3124 if (ifmrp != NULL) { 3125 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3126 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3127 cmd)); 3128 data = saved_data; 3129 ifmr_update(ifmrp, data); 3130 } 3131 #endif 3132 CURVNET_RESTORE(); 3133 return (error); 3134 } 3135 3136 /* 3137 * The code common to handling reference counted flags, 3138 * e.g., in ifpromisc() and if_allmulti(). 3139 * The "pflag" argument can specify a permanent mode flag to check, 3140 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3141 * 3142 * Only to be used on stack-owned flags, not driver-owned flags. 3143 */ 3144 static int 3145 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3146 { 3147 struct ifreq ifr; 3148 int error; 3149 int oldflags, oldcount; 3150 3151 /* Sanity checks to catch programming errors */ 3152 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3153 ("%s: setting driver-owned flag %d", __func__, flag)); 3154 3155 if (onswitch) 3156 KASSERT(*refcount >= 0, 3157 ("%s: increment negative refcount %d for flag %d", 3158 __func__, *refcount, flag)); 3159 else 3160 KASSERT(*refcount > 0, 3161 ("%s: decrement non-positive refcount %d for flag %d", 3162 __func__, *refcount, flag)); 3163 3164 /* In case this mode is permanent, just touch refcount */ 3165 if (ifp->if_flags & pflag) { 3166 *refcount += onswitch ? 1 : -1; 3167 return (0); 3168 } 3169 3170 /* Save ifnet parameters for if_ioctl() may fail */ 3171 oldcount = *refcount; 3172 oldflags = ifp->if_flags; 3173 3174 /* 3175 * See if we aren't the only and touching refcount is enough. 3176 * Actually toggle interface flag if we are the first or last. 3177 */ 3178 if (onswitch) { 3179 if ((*refcount)++) 3180 return (0); 3181 ifp->if_flags |= flag; 3182 } else { 3183 if (--(*refcount)) 3184 return (0); 3185 ifp->if_flags &= ~flag; 3186 } 3187 3188 /* Call down the driver since we've changed interface flags */ 3189 if (ifp->if_ioctl == NULL) { 3190 error = EOPNOTSUPP; 3191 goto recover; 3192 } 3193 ifr.ifr_flags = ifp->if_flags & 0xffff; 3194 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3195 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3196 if (error) 3197 goto recover; 3198 /* Notify userland that interface flags have changed */ 3199 rt_ifmsg(ifp); 3200 return (0); 3201 3202 recover: 3203 /* Recover after driver error */ 3204 *refcount = oldcount; 3205 ifp->if_flags = oldflags; 3206 return (error); 3207 } 3208 3209 /* 3210 * Set/clear promiscuous mode on interface ifp based on the truth value 3211 * of pswitch. The calls are reference counted so that only the first 3212 * "on" request actually has an effect, as does the final "off" request. 3213 * Results are undefined if the "off" and "on" requests are not matched. 3214 */ 3215 int 3216 ifpromisc(struct ifnet *ifp, int pswitch) 3217 { 3218 int error; 3219 int oldflags = ifp->if_flags; 3220 3221 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3222 &ifp->if_pcount, pswitch); 3223 /* If promiscuous mode status has changed, log a message */ 3224 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3225 log_promisc_mode_change) 3226 if_printf(ifp, "promiscuous mode %s\n", 3227 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3228 return (error); 3229 } 3230 3231 /* 3232 * Return interface configuration 3233 * of system. List may be used 3234 * in later ioctl's (above) to get 3235 * other information. 3236 */ 3237 /*ARGSUSED*/ 3238 static int 3239 ifconf(u_long cmd, caddr_t data) 3240 { 3241 struct ifconf *ifc = (struct ifconf *)data; 3242 struct ifnet *ifp; 3243 struct ifaddr *ifa; 3244 struct ifreq ifr; 3245 struct sbuf *sb; 3246 int error, full = 0, valid_len, max_len; 3247 3248 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3249 max_len = MAXPHYS - 1; 3250 3251 /* Prevent hostile input from being able to crash the system */ 3252 if (ifc->ifc_len <= 0) 3253 return (EINVAL); 3254 3255 again: 3256 if (ifc->ifc_len <= max_len) { 3257 max_len = ifc->ifc_len; 3258 full = 1; 3259 } 3260 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3261 max_len = 0; 3262 valid_len = 0; 3263 3264 IFNET_RLOCK(); 3265 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3266 struct epoch_tracker et; 3267 int addrs; 3268 3269 /* 3270 * Zero the ifr to make sure we don't disclose the contents 3271 * of the stack. 3272 */ 3273 memset(&ifr, 0, sizeof(ifr)); 3274 3275 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3276 >= sizeof(ifr.ifr_name)) { 3277 sbuf_delete(sb); 3278 IFNET_RUNLOCK(); 3279 return (ENAMETOOLONG); 3280 } 3281 3282 addrs = 0; 3283 NET_EPOCH_ENTER(et); 3284 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3285 struct sockaddr *sa = ifa->ifa_addr; 3286 3287 if (prison_if(curthread->td_ucred, sa) != 0) 3288 continue; 3289 addrs++; 3290 if (sa->sa_len <= sizeof(*sa)) { 3291 if (sa->sa_len < sizeof(*sa)) { 3292 memset(&ifr.ifr_ifru.ifru_addr, 0, 3293 sizeof(ifr.ifr_ifru.ifru_addr)); 3294 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3295 sa->sa_len); 3296 } else 3297 ifr.ifr_ifru.ifru_addr = *sa; 3298 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3299 max_len += sizeof(ifr); 3300 } else { 3301 sbuf_bcat(sb, &ifr, 3302 offsetof(struct ifreq, ifr_addr)); 3303 max_len += offsetof(struct ifreq, ifr_addr); 3304 sbuf_bcat(sb, sa, sa->sa_len); 3305 max_len += sa->sa_len; 3306 } 3307 3308 if (sbuf_error(sb) == 0) 3309 valid_len = sbuf_len(sb); 3310 } 3311 NET_EPOCH_EXIT(et); 3312 if (addrs == 0) { 3313 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3314 max_len += sizeof(ifr); 3315 3316 if (sbuf_error(sb) == 0) 3317 valid_len = sbuf_len(sb); 3318 } 3319 } 3320 IFNET_RUNLOCK(); 3321 3322 /* 3323 * If we didn't allocate enough space (uncommon), try again. If 3324 * we have already allocated as much space as we are allowed, 3325 * return what we've got. 3326 */ 3327 if (valid_len != max_len && !full) { 3328 sbuf_delete(sb); 3329 goto again; 3330 } 3331 3332 ifc->ifc_len = valid_len; 3333 sbuf_finish(sb); 3334 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3335 sbuf_delete(sb); 3336 return (error); 3337 } 3338 3339 /* 3340 * Just like ifpromisc(), but for all-multicast-reception mode. 3341 */ 3342 int 3343 if_allmulti(struct ifnet *ifp, int onswitch) 3344 { 3345 3346 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3347 } 3348 3349 struct ifmultiaddr * 3350 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3351 { 3352 struct ifmultiaddr *ifma; 3353 3354 IF_ADDR_LOCK_ASSERT(ifp); 3355 3356 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3357 if (sa->sa_family == AF_LINK) { 3358 if (sa_dl_equal(ifma->ifma_addr, sa)) 3359 break; 3360 } else { 3361 if (sa_equal(ifma->ifma_addr, sa)) 3362 break; 3363 } 3364 } 3365 3366 return ifma; 3367 } 3368 3369 /* 3370 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3371 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3372 * the ifnet multicast address list here, so the caller must do that and 3373 * other setup work (such as notifying the device driver). The reference 3374 * count is initialized to 1. 3375 */ 3376 static struct ifmultiaddr * 3377 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3378 int mflags) 3379 { 3380 struct ifmultiaddr *ifma; 3381 struct sockaddr *dupsa; 3382 3383 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3384 M_ZERO); 3385 if (ifma == NULL) 3386 return (NULL); 3387 3388 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3389 if (dupsa == NULL) { 3390 free(ifma, M_IFMADDR); 3391 return (NULL); 3392 } 3393 bcopy(sa, dupsa, sa->sa_len); 3394 ifma->ifma_addr = dupsa; 3395 3396 ifma->ifma_ifp = ifp; 3397 ifma->ifma_refcount = 1; 3398 ifma->ifma_protospec = NULL; 3399 3400 if (llsa == NULL) { 3401 ifma->ifma_lladdr = NULL; 3402 return (ifma); 3403 } 3404 3405 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3406 if (dupsa == NULL) { 3407 free(ifma->ifma_addr, M_IFMADDR); 3408 free(ifma, M_IFMADDR); 3409 return (NULL); 3410 } 3411 bcopy(llsa, dupsa, llsa->sa_len); 3412 ifma->ifma_lladdr = dupsa; 3413 3414 return (ifma); 3415 } 3416 3417 /* 3418 * if_freemulti: free ifmultiaddr structure and possibly attached related 3419 * addresses. The caller is responsible for implementing reference 3420 * counting, notifying the driver, handling routing messages, and releasing 3421 * any dependent link layer state. 3422 */ 3423 #ifdef MCAST_VERBOSE 3424 extern void kdb_backtrace(void); 3425 #endif 3426 static void 3427 if_freemulti_internal(struct ifmultiaddr *ifma) 3428 { 3429 3430 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3431 ifma->ifma_refcount)); 3432 3433 if (ifma->ifma_lladdr != NULL) 3434 free(ifma->ifma_lladdr, M_IFMADDR); 3435 #ifdef MCAST_VERBOSE 3436 kdb_backtrace(); 3437 printf("%s freeing ifma: %p\n", __func__, ifma); 3438 #endif 3439 free(ifma->ifma_addr, M_IFMADDR); 3440 free(ifma, M_IFMADDR); 3441 } 3442 3443 static void 3444 if_destroymulti(epoch_context_t ctx) 3445 { 3446 struct ifmultiaddr *ifma; 3447 3448 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3449 if_freemulti_internal(ifma); 3450 } 3451 3452 void 3453 if_freemulti(struct ifmultiaddr *ifma) 3454 { 3455 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3456 ifma->ifma_refcount)); 3457 3458 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3459 } 3460 3461 3462 /* 3463 * Register an additional multicast address with a network interface. 3464 * 3465 * - If the address is already present, bump the reference count on the 3466 * address and return. 3467 * - If the address is not link-layer, look up a link layer address. 3468 * - Allocate address structures for one or both addresses, and attach to the 3469 * multicast address list on the interface. If automatically adding a link 3470 * layer address, the protocol address will own a reference to the link 3471 * layer address, to be freed when it is freed. 3472 * - Notify the network device driver of an addition to the multicast address 3473 * list. 3474 * 3475 * 'sa' points to caller-owned memory with the desired multicast address. 3476 * 3477 * 'retifma' will be used to return a pointer to the resulting multicast 3478 * address reference, if desired. 3479 */ 3480 int 3481 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3482 struct ifmultiaddr **retifma) 3483 { 3484 struct ifmultiaddr *ifma, *ll_ifma; 3485 struct sockaddr *llsa; 3486 struct sockaddr_dl sdl; 3487 int error; 3488 3489 #ifdef INET 3490 IN_MULTI_LIST_UNLOCK_ASSERT(); 3491 #endif 3492 #ifdef INET6 3493 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3494 #endif 3495 /* 3496 * If the address is already present, return a new reference to it; 3497 * otherwise, allocate storage and set up a new address. 3498 */ 3499 IF_ADDR_WLOCK(ifp); 3500 ifma = if_findmulti(ifp, sa); 3501 if (ifma != NULL) { 3502 ifma->ifma_refcount++; 3503 if (retifma != NULL) 3504 *retifma = ifma; 3505 IF_ADDR_WUNLOCK(ifp); 3506 return (0); 3507 } 3508 3509 /* 3510 * The address isn't already present; resolve the protocol address 3511 * into a link layer address, and then look that up, bump its 3512 * refcount or allocate an ifma for that also. 3513 * Most link layer resolving functions returns address data which 3514 * fits inside default sockaddr_dl structure. However callback 3515 * can allocate another sockaddr structure, in that case we need to 3516 * free it later. 3517 */ 3518 llsa = NULL; 3519 ll_ifma = NULL; 3520 if (ifp->if_resolvemulti != NULL) { 3521 /* Provide called function with buffer size information */ 3522 sdl.sdl_len = sizeof(sdl); 3523 llsa = (struct sockaddr *)&sdl; 3524 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3525 if (error) 3526 goto unlock_out; 3527 } 3528 3529 /* 3530 * Allocate the new address. Don't hook it up yet, as we may also 3531 * need to allocate a link layer multicast address. 3532 */ 3533 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3534 if (ifma == NULL) { 3535 error = ENOMEM; 3536 goto free_llsa_out; 3537 } 3538 3539 /* 3540 * If a link layer address is found, we'll need to see if it's 3541 * already present in the address list, or allocate is as well. 3542 * When this block finishes, the link layer address will be on the 3543 * list. 3544 */ 3545 if (llsa != NULL) { 3546 ll_ifma = if_findmulti(ifp, llsa); 3547 if (ll_ifma == NULL) { 3548 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3549 if (ll_ifma == NULL) { 3550 --ifma->ifma_refcount; 3551 if_freemulti(ifma); 3552 error = ENOMEM; 3553 goto free_llsa_out; 3554 } 3555 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3556 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3557 ifma_link); 3558 } else 3559 ll_ifma->ifma_refcount++; 3560 ifma->ifma_llifma = ll_ifma; 3561 } 3562 3563 /* 3564 * We now have a new multicast address, ifma, and possibly a new or 3565 * referenced link layer address. Add the primary address to the 3566 * ifnet address list. 3567 */ 3568 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3569 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3570 3571 if (retifma != NULL) 3572 *retifma = ifma; 3573 3574 /* 3575 * Must generate the message while holding the lock so that 'ifma' 3576 * pointer is still valid. 3577 */ 3578 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3579 IF_ADDR_WUNLOCK(ifp); 3580 3581 /* 3582 * We are certain we have added something, so call down to the 3583 * interface to let them know about it. 3584 */ 3585 if (ifp->if_ioctl != NULL) { 3586 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3587 } 3588 3589 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3590 link_free_sdl(llsa); 3591 3592 return (0); 3593 3594 free_llsa_out: 3595 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3596 link_free_sdl(llsa); 3597 3598 unlock_out: 3599 IF_ADDR_WUNLOCK(ifp); 3600 return (error); 3601 } 3602 3603 /* 3604 * Delete a multicast group membership by network-layer group address. 3605 * 3606 * Returns ENOENT if the entry could not be found. If ifp no longer 3607 * exists, results are undefined. This entry point should only be used 3608 * from subsystems which do appropriate locking to hold ifp for the 3609 * duration of the call. 3610 * Network-layer protocol domains must use if_delmulti_ifma(). 3611 */ 3612 int 3613 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3614 { 3615 struct ifmultiaddr *ifma; 3616 int lastref; 3617 #ifdef INVARIANTS 3618 struct ifnet *oifp; 3619 3620 NET_EPOCH_ASSERT(); 3621 3622 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3623 if (ifp == oifp) 3624 break; 3625 if (ifp != oifp) 3626 ifp = NULL; 3627 3628 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3629 #endif 3630 if (ifp == NULL) 3631 return (ENOENT); 3632 3633 IF_ADDR_WLOCK(ifp); 3634 lastref = 0; 3635 ifma = if_findmulti(ifp, sa); 3636 if (ifma != NULL) 3637 lastref = if_delmulti_locked(ifp, ifma, 0); 3638 IF_ADDR_WUNLOCK(ifp); 3639 3640 if (ifma == NULL) 3641 return (ENOENT); 3642 3643 if (lastref && ifp->if_ioctl != NULL) { 3644 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3645 } 3646 3647 return (0); 3648 } 3649 3650 /* 3651 * Delete all multicast group membership for an interface. 3652 * Should be used to quickly flush all multicast filters. 3653 */ 3654 void 3655 if_delallmulti(struct ifnet *ifp) 3656 { 3657 struct ifmultiaddr *ifma; 3658 struct ifmultiaddr *next; 3659 3660 IF_ADDR_WLOCK(ifp); 3661 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3662 if_delmulti_locked(ifp, ifma, 0); 3663 IF_ADDR_WUNLOCK(ifp); 3664 } 3665 3666 void 3667 if_delmulti_ifma(struct ifmultiaddr *ifma) 3668 { 3669 if_delmulti_ifma_flags(ifma, 0); 3670 } 3671 3672 /* 3673 * Delete a multicast group membership by group membership pointer. 3674 * Network-layer protocol domains must use this routine. 3675 * 3676 * It is safe to call this routine if the ifp disappeared. 3677 */ 3678 void 3679 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3680 { 3681 struct ifnet *ifp; 3682 int lastref; 3683 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3684 #ifdef INET 3685 IN_MULTI_LIST_UNLOCK_ASSERT(); 3686 #endif 3687 ifp = ifma->ifma_ifp; 3688 #ifdef DIAGNOSTIC 3689 if (ifp == NULL) { 3690 printf("%s: ifma_ifp seems to be detached\n", __func__); 3691 } else { 3692 struct epoch_tracker et; 3693 struct ifnet *oifp; 3694 3695 NET_EPOCH_ENTER(et); 3696 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3697 if (ifp == oifp) 3698 break; 3699 NET_EPOCH_EXIT(et); 3700 if (ifp != oifp) 3701 ifp = NULL; 3702 } 3703 #endif 3704 /* 3705 * If and only if the ifnet instance exists: Acquire the address lock. 3706 */ 3707 if (ifp != NULL) 3708 IF_ADDR_WLOCK(ifp); 3709 3710 lastref = if_delmulti_locked(ifp, ifma, flags); 3711 3712 if (ifp != NULL) { 3713 /* 3714 * If and only if the ifnet instance exists: 3715 * Release the address lock. 3716 * If the group was left: update the hardware hash filter. 3717 */ 3718 IF_ADDR_WUNLOCK(ifp); 3719 if (lastref && ifp->if_ioctl != NULL) { 3720 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3721 } 3722 } 3723 } 3724 3725 /* 3726 * Perform deletion of network-layer and/or link-layer multicast address. 3727 * 3728 * Return 0 if the reference count was decremented. 3729 * Return 1 if the final reference was released, indicating that the 3730 * hardware hash filter should be reprogrammed. 3731 */ 3732 static int 3733 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3734 { 3735 struct ifmultiaddr *ll_ifma; 3736 3737 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3738 KASSERT(ifma->ifma_ifp == ifp, 3739 ("%s: inconsistent ifp %p", __func__, ifp)); 3740 IF_ADDR_WLOCK_ASSERT(ifp); 3741 } 3742 3743 ifp = ifma->ifma_ifp; 3744 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3745 3746 /* 3747 * If the ifnet is detaching, null out references to ifnet, 3748 * so that upper protocol layers will notice, and not attempt 3749 * to obtain locks for an ifnet which no longer exists. The 3750 * routing socket announcement must happen before the ifnet 3751 * instance is detached from the system. 3752 */ 3753 if (detaching) { 3754 #ifdef DIAGNOSTIC 3755 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3756 #endif 3757 /* 3758 * ifp may already be nulled out if we are being reentered 3759 * to delete the ll_ifma. 3760 */ 3761 if (ifp != NULL) { 3762 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3763 ifma->ifma_ifp = NULL; 3764 } 3765 } 3766 3767 if (--ifma->ifma_refcount > 0) 3768 return 0; 3769 3770 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3771 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3772 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3773 } 3774 /* 3775 * If this ifma is a network-layer ifma, a link-layer ifma may 3776 * have been associated with it. Release it first if so. 3777 */ 3778 ll_ifma = ifma->ifma_llifma; 3779 if (ll_ifma != NULL) { 3780 KASSERT(ifma->ifma_lladdr != NULL, 3781 ("%s: llifma w/o lladdr", __func__)); 3782 if (detaching) 3783 ll_ifma->ifma_ifp = NULL; /* XXX */ 3784 if (--ll_ifma->ifma_refcount == 0) { 3785 if (ifp != NULL) { 3786 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3787 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3788 ifma_link); 3789 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3790 } 3791 } 3792 if_freemulti(ll_ifma); 3793 } 3794 } 3795 #ifdef INVARIANTS 3796 if (ifp) { 3797 struct ifmultiaddr *ifmatmp; 3798 3799 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3800 MPASS(ifma != ifmatmp); 3801 } 3802 #endif 3803 if_freemulti(ifma); 3804 /* 3805 * The last reference to this instance of struct ifmultiaddr 3806 * was released; the hardware should be notified of this change. 3807 */ 3808 return 1; 3809 } 3810 3811 /* 3812 * Set the link layer address on an interface. 3813 * 3814 * At this time we only support certain types of interfaces, 3815 * and we don't allow the length of the address to change. 3816 * 3817 * Set noinline to be dtrace-friendly 3818 */ 3819 __noinline int 3820 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3821 { 3822 struct sockaddr_dl *sdl; 3823 struct ifaddr *ifa; 3824 struct ifreq ifr; 3825 3826 ifa = ifp->if_addr; 3827 if (ifa == NULL) 3828 return (EINVAL); 3829 3830 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3831 if (sdl == NULL) 3832 return (EINVAL); 3833 3834 if (len != sdl->sdl_alen) /* don't allow length to change */ 3835 return (EINVAL); 3836 3837 switch (ifp->if_type) { 3838 case IFT_ETHER: 3839 case IFT_XETHER: 3840 case IFT_L2VLAN: 3841 case IFT_BRIDGE: 3842 case IFT_IEEE8023ADLAG: 3843 bcopy(lladdr, LLADDR(sdl), len); 3844 break; 3845 default: 3846 return (ENODEV); 3847 } 3848 3849 /* 3850 * If the interface is already up, we need 3851 * to re-init it in order to reprogram its 3852 * address filter. 3853 */ 3854 if ((ifp->if_flags & IFF_UP) != 0) { 3855 if (ifp->if_ioctl) { 3856 ifp->if_flags &= ~IFF_UP; 3857 ifr.ifr_flags = ifp->if_flags & 0xffff; 3858 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3859 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3860 ifp->if_flags |= IFF_UP; 3861 ifr.ifr_flags = ifp->if_flags & 0xffff; 3862 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3863 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3864 } 3865 } 3866 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3867 3868 return (0); 3869 } 3870 3871 /* 3872 * Compat function for handling basic encapsulation requests. 3873 * Not converted stacks (FDDI, IB, ..) supports traditional 3874 * output model: ARP (and other similar L2 protocols) are handled 3875 * inside output routine, arpresolve/nd6_resolve() returns MAC 3876 * address instead of full prepend. 3877 * 3878 * This function creates calculated header==MAC for IPv4/IPv6 and 3879 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3880 * address families. 3881 */ 3882 static int 3883 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3884 { 3885 3886 if (req->rtype != IFENCAP_LL) 3887 return (EOPNOTSUPP); 3888 3889 if (req->bufsize < req->lladdr_len) 3890 return (ENOMEM); 3891 3892 switch (req->family) { 3893 case AF_INET: 3894 case AF_INET6: 3895 break; 3896 default: 3897 return (EAFNOSUPPORT); 3898 } 3899 3900 /* Copy lladdr to storage as is */ 3901 memmove(req->buf, req->lladdr, req->lladdr_len); 3902 req->bufsize = req->lladdr_len; 3903 req->lladdr_off = 0; 3904 3905 return (0); 3906 } 3907 3908 /* 3909 * Tunnel interfaces can nest, also they may cause infinite recursion 3910 * calls when misconfigured. We'll prevent this by detecting loops. 3911 * High nesting level may cause stack exhaustion. We'll prevent this 3912 * by introducing upper limit. 3913 * 3914 * Return 0, if tunnel nesting count is equal or less than limit. 3915 */ 3916 int 3917 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3918 int limit) 3919 { 3920 struct m_tag *mtag; 3921 int count; 3922 3923 count = 1; 3924 mtag = NULL; 3925 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3926 if (*(struct ifnet **)(mtag + 1) == ifp) { 3927 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3928 return (EIO); 3929 } 3930 count++; 3931 } 3932 if (count > limit) { 3933 log(LOG_NOTICE, 3934 "%s: if_output recursively called too many times(%d)\n", 3935 if_name(ifp), count); 3936 return (EIO); 3937 } 3938 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3939 if (mtag == NULL) 3940 return (ENOMEM); 3941 *(struct ifnet **)(mtag + 1) = ifp; 3942 m_tag_prepend(m, mtag); 3943 return (0); 3944 } 3945 3946 /* 3947 * Get the link layer address that was read from the hardware at attach. 3948 * 3949 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3950 * their component interfaces as IFT_IEEE8023ADLAG. 3951 */ 3952 int 3953 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3954 { 3955 3956 if (ifp->if_hw_addr == NULL) 3957 return (ENODEV); 3958 3959 switch (ifp->if_type) { 3960 case IFT_ETHER: 3961 case IFT_IEEE8023ADLAG: 3962 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3963 return (0); 3964 default: 3965 return (ENODEV); 3966 } 3967 } 3968 3969 /* 3970 * The name argument must be a pointer to storage which will last as 3971 * long as the interface does. For physical devices, the result of 3972 * device_get_name(dev) is a good choice and for pseudo-devices a 3973 * static string works well. 3974 */ 3975 void 3976 if_initname(struct ifnet *ifp, const char *name, int unit) 3977 { 3978 ifp->if_dname = name; 3979 ifp->if_dunit = unit; 3980 if (unit != IF_DUNIT_NONE) 3981 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3982 else 3983 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3984 } 3985 3986 int 3987 if_printf(struct ifnet *ifp, const char *fmt, ...) 3988 { 3989 char if_fmt[256]; 3990 va_list ap; 3991 3992 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3993 va_start(ap, fmt); 3994 vlog(LOG_INFO, if_fmt, ap); 3995 va_end(ap); 3996 return (0); 3997 } 3998 3999 void 4000 if_start(struct ifnet *ifp) 4001 { 4002 4003 (*(ifp)->if_start)(ifp); 4004 } 4005 4006 /* 4007 * Backwards compatibility interface for drivers 4008 * that have not implemented it 4009 */ 4010 static int 4011 if_transmit(struct ifnet *ifp, struct mbuf *m) 4012 { 4013 int error; 4014 4015 IFQ_HANDOFF(ifp, m, error); 4016 return (error); 4017 } 4018 4019 static void 4020 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4021 { 4022 4023 m_freem(m); 4024 } 4025 4026 int 4027 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4028 { 4029 int active = 0; 4030 4031 IF_LOCK(ifq); 4032 if (_IF_QFULL(ifq)) { 4033 IF_UNLOCK(ifq); 4034 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4035 m_freem(m); 4036 return (0); 4037 } 4038 if (ifp != NULL) { 4039 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4040 if (m->m_flags & (M_BCAST|M_MCAST)) 4041 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4042 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4043 } 4044 _IF_ENQUEUE(ifq, m); 4045 IF_UNLOCK(ifq); 4046 if (ifp != NULL && !active) 4047 (*(ifp)->if_start)(ifp); 4048 return (1); 4049 } 4050 4051 void 4052 if_register_com_alloc(u_char type, 4053 if_com_alloc_t *a, if_com_free_t *f) 4054 { 4055 4056 KASSERT(if_com_alloc[type] == NULL, 4057 ("if_register_com_alloc: %d already registered", type)); 4058 KASSERT(if_com_free[type] == NULL, 4059 ("if_register_com_alloc: %d free already registered", type)); 4060 4061 if_com_alloc[type] = a; 4062 if_com_free[type] = f; 4063 } 4064 4065 void 4066 if_deregister_com_alloc(u_char type) 4067 { 4068 4069 KASSERT(if_com_alloc[type] != NULL, 4070 ("if_deregister_com_alloc: %d not registered", type)); 4071 KASSERT(if_com_free[type] != NULL, 4072 ("if_deregister_com_alloc: %d free not registered", type)); 4073 if_com_alloc[type] = NULL; 4074 if_com_free[type] = NULL; 4075 } 4076 4077 /* API for driver access to network stack owned ifnet.*/ 4078 uint64_t 4079 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4080 { 4081 uint64_t oldbrate; 4082 4083 oldbrate = ifp->if_baudrate; 4084 ifp->if_baudrate = baudrate; 4085 return (oldbrate); 4086 } 4087 4088 uint64_t 4089 if_getbaudrate(if_t ifp) 4090 { 4091 4092 return (((struct ifnet *)ifp)->if_baudrate); 4093 } 4094 4095 int 4096 if_setcapabilities(if_t ifp, int capabilities) 4097 { 4098 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4099 return (0); 4100 } 4101 4102 int 4103 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4104 { 4105 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4106 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4107 4108 return (0); 4109 } 4110 4111 int 4112 if_getcapabilities(if_t ifp) 4113 { 4114 return ((struct ifnet *)ifp)->if_capabilities; 4115 } 4116 4117 int 4118 if_setcapenable(if_t ifp, int capabilities) 4119 { 4120 ((struct ifnet *)ifp)->if_capenable = capabilities; 4121 return (0); 4122 } 4123 4124 int 4125 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4126 { 4127 if(setcap) 4128 ((struct ifnet *)ifp)->if_capenable |= setcap; 4129 if(clearcap) 4130 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4131 4132 return (0); 4133 } 4134 4135 const char * 4136 if_getdname(if_t ifp) 4137 { 4138 return ((struct ifnet *)ifp)->if_dname; 4139 } 4140 4141 int 4142 if_togglecapenable(if_t ifp, int togglecap) 4143 { 4144 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4145 return (0); 4146 } 4147 4148 int 4149 if_getcapenable(if_t ifp) 4150 { 4151 return ((struct ifnet *)ifp)->if_capenable; 4152 } 4153 4154 /* 4155 * This is largely undesirable because it ties ifnet to a device, but does 4156 * provide flexiblity for an embedded product vendor. Should be used with 4157 * the understanding that it violates the interface boundaries, and should be 4158 * a last resort only. 4159 */ 4160 int 4161 if_setdev(if_t ifp, void *dev) 4162 { 4163 return (0); 4164 } 4165 4166 int 4167 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4168 { 4169 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4170 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4171 4172 return (0); 4173 } 4174 4175 int 4176 if_getdrvflags(if_t ifp) 4177 { 4178 return ((struct ifnet *)ifp)->if_drv_flags; 4179 } 4180 4181 int 4182 if_setdrvflags(if_t ifp, int flags) 4183 { 4184 ((struct ifnet *)ifp)->if_drv_flags = flags; 4185 return (0); 4186 } 4187 4188 4189 int 4190 if_setflags(if_t ifp, int flags) 4191 { 4192 ((struct ifnet *)ifp)->if_flags = flags; 4193 return (0); 4194 } 4195 4196 int 4197 if_setflagbits(if_t ifp, int set, int clear) 4198 { 4199 ((struct ifnet *)ifp)->if_flags |= set; 4200 ((struct ifnet *)ifp)->if_flags &= ~clear; 4201 4202 return (0); 4203 } 4204 4205 int 4206 if_getflags(if_t ifp) 4207 { 4208 return ((struct ifnet *)ifp)->if_flags; 4209 } 4210 4211 int 4212 if_clearhwassist(if_t ifp) 4213 { 4214 ((struct ifnet *)ifp)->if_hwassist = 0; 4215 return (0); 4216 } 4217 4218 int 4219 if_sethwassistbits(if_t ifp, int toset, int toclear) 4220 { 4221 ((struct ifnet *)ifp)->if_hwassist |= toset; 4222 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4223 4224 return (0); 4225 } 4226 4227 int 4228 if_sethwassist(if_t ifp, int hwassist_bit) 4229 { 4230 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4231 return (0); 4232 } 4233 4234 int 4235 if_gethwassist(if_t ifp) 4236 { 4237 return ((struct ifnet *)ifp)->if_hwassist; 4238 } 4239 4240 int 4241 if_setmtu(if_t ifp, int mtu) 4242 { 4243 ((struct ifnet *)ifp)->if_mtu = mtu; 4244 return (0); 4245 } 4246 4247 int 4248 if_getmtu(if_t ifp) 4249 { 4250 return ((struct ifnet *)ifp)->if_mtu; 4251 } 4252 4253 int 4254 if_getmtu_family(if_t ifp, int family) 4255 { 4256 struct domain *dp; 4257 4258 for (dp = domains; dp; dp = dp->dom_next) { 4259 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4260 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4261 } 4262 4263 return (((struct ifnet *)ifp)->if_mtu); 4264 } 4265 4266 int 4267 if_setsoftc(if_t ifp, void *softc) 4268 { 4269 ((struct ifnet *)ifp)->if_softc = softc; 4270 return (0); 4271 } 4272 4273 void * 4274 if_getsoftc(if_t ifp) 4275 { 4276 return ((struct ifnet *)ifp)->if_softc; 4277 } 4278 4279 void 4280 if_setrcvif(struct mbuf *m, if_t ifp) 4281 { 4282 4283 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4284 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4285 } 4286 4287 void 4288 if_setvtag(struct mbuf *m, uint16_t tag) 4289 { 4290 m->m_pkthdr.ether_vtag = tag; 4291 } 4292 4293 uint16_t 4294 if_getvtag(struct mbuf *m) 4295 { 4296 4297 return (m->m_pkthdr.ether_vtag); 4298 } 4299 4300 int 4301 if_sendq_empty(if_t ifp) 4302 { 4303 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4304 } 4305 4306 struct ifaddr * 4307 if_getifaddr(if_t ifp) 4308 { 4309 return ((struct ifnet *)ifp)->if_addr; 4310 } 4311 4312 int 4313 if_getamcount(if_t ifp) 4314 { 4315 return ((struct ifnet *)ifp)->if_amcount; 4316 } 4317 4318 4319 int 4320 if_setsendqready(if_t ifp) 4321 { 4322 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4323 return (0); 4324 } 4325 4326 int 4327 if_setsendqlen(if_t ifp, int tx_desc_count) 4328 { 4329 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4330 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4331 4332 return (0); 4333 } 4334 4335 int 4336 if_vlantrunkinuse(if_t ifp) 4337 { 4338 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4339 } 4340 4341 int 4342 if_input(if_t ifp, struct mbuf* sendmp) 4343 { 4344 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4345 return (0); 4346 4347 } 4348 4349 /* XXX */ 4350 #ifndef ETH_ADDR_LEN 4351 #define ETH_ADDR_LEN 6 4352 #endif 4353 4354 int 4355 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4356 { 4357 struct ifmultiaddr *ifma; 4358 uint8_t *lmta = (uint8_t *)mta; 4359 int mcnt = 0; 4360 4361 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4362 if (ifma->ifma_addr->sa_family != AF_LINK) 4363 continue; 4364 4365 if (mcnt == max) 4366 break; 4367 4368 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4369 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4370 mcnt++; 4371 } 4372 *cnt = mcnt; 4373 4374 return (0); 4375 } 4376 4377 int 4378 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4379 { 4380 int error; 4381 4382 if_maddr_rlock(ifp); 4383 error = if_setupmultiaddr(ifp, mta, cnt, max); 4384 if_maddr_runlock(ifp); 4385 return (error); 4386 } 4387 4388 int 4389 if_multiaddr_count(if_t ifp, int max) 4390 { 4391 struct ifmultiaddr *ifma; 4392 int count; 4393 4394 count = 0; 4395 if_maddr_rlock(ifp); 4396 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4397 if (ifma->ifma_addr->sa_family != AF_LINK) 4398 continue; 4399 count++; 4400 if (count == max) 4401 break; 4402 } 4403 if_maddr_runlock(ifp); 4404 return (count); 4405 } 4406 4407 int 4408 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4409 { 4410 struct ifmultiaddr *ifma; 4411 int cnt = 0; 4412 4413 if_maddr_rlock(ifp); 4414 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4415 cnt += filter(arg, ifma, cnt); 4416 if_maddr_runlock(ifp); 4417 return (cnt); 4418 } 4419 4420 struct mbuf * 4421 if_dequeue(if_t ifp) 4422 { 4423 struct mbuf *m; 4424 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4425 4426 return (m); 4427 } 4428 4429 int 4430 if_sendq_prepend(if_t ifp, struct mbuf *m) 4431 { 4432 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4433 return (0); 4434 } 4435 4436 int 4437 if_setifheaderlen(if_t ifp, int len) 4438 { 4439 ((struct ifnet *)ifp)->if_hdrlen = len; 4440 return (0); 4441 } 4442 4443 caddr_t 4444 if_getlladdr(if_t ifp) 4445 { 4446 return (IF_LLADDR((struct ifnet *)ifp)); 4447 } 4448 4449 void * 4450 if_gethandle(u_char type) 4451 { 4452 return (if_alloc(type)); 4453 } 4454 4455 void 4456 if_bpfmtap(if_t ifh, struct mbuf *m) 4457 { 4458 struct ifnet *ifp = (struct ifnet *)ifh; 4459 4460 BPF_MTAP(ifp, m); 4461 } 4462 4463 void 4464 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4465 { 4466 struct ifnet *ifp = (struct ifnet *)ifh; 4467 4468 ETHER_BPF_MTAP(ifp, m); 4469 } 4470 4471 void 4472 if_vlancap(if_t ifh) 4473 { 4474 struct ifnet *ifp = (struct ifnet *)ifh; 4475 VLAN_CAPABILITIES(ifp); 4476 } 4477 4478 int 4479 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4480 { 4481 4482 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4483 return (0); 4484 } 4485 4486 int 4487 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4488 { 4489 4490 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4491 return (0); 4492 } 4493 4494 int 4495 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4496 { 4497 4498 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4499 return (0); 4500 } 4501 4502 u_int 4503 if_gethwtsomax(if_t ifp) 4504 { 4505 4506 return (((struct ifnet *)ifp)->if_hw_tsomax); 4507 } 4508 4509 u_int 4510 if_gethwtsomaxsegcount(if_t ifp) 4511 { 4512 4513 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4514 } 4515 4516 u_int 4517 if_gethwtsomaxsegsize(if_t ifp) 4518 { 4519 4520 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4521 } 4522 4523 void 4524 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4525 { 4526 ((struct ifnet *)ifp)->if_init = init_fn; 4527 } 4528 4529 void 4530 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4531 { 4532 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4533 } 4534 4535 void 4536 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4537 { 4538 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4539 } 4540 4541 void 4542 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4543 { 4544 ((struct ifnet *)ifp)->if_transmit = start_fn; 4545 } 4546 4547 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4548 { 4549 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4550 4551 } 4552 4553 void 4554 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4555 { 4556 4557 ifp->if_get_counter = fn; 4558 } 4559 4560 /* Revisit these - These are inline functions originally. */ 4561 int 4562 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4563 { 4564 return drbr_inuse(ifh, br); 4565 } 4566 4567 struct mbuf* 4568 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4569 { 4570 return drbr_dequeue(ifh, br); 4571 } 4572 4573 int 4574 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4575 { 4576 return drbr_needs_enqueue(ifh, br); 4577 } 4578 4579 int 4580 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4581 { 4582 return drbr_enqueue(ifh, br, m); 4583 4584 } 4585