1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_bpf.h" 36 #include "opt_inet6.h" 37 #include "opt_inet.h" 38 39 #include <sys/param.h> 40 #include <sys/conf.h> 41 #include <sys/eventhandler.h> 42 #include <sys/malloc.h> 43 #include <sys/domainset.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/epoch.h> 47 #include <sys/mbuf.h> 48 #include <sys/systm.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/protosw.h> 54 #include <sys/kernel.h> 55 #include <sys/lock.h> 56 #include <sys/refcount.h> 57 #include <sys/module.h> 58 #include <sys/rwlock.h> 59 #include <sys/sockio.h> 60 #include <sys/syslog.h> 61 #include <sys/sysctl.h> 62 #include <sys/sysent.h> 63 #include <sys/taskqueue.h> 64 #include <sys/domain.h> 65 #include <sys/jail.h> 66 #include <sys/priv.h> 67 68 #include <machine/stdarg.h> 69 #include <vm/uma.h> 70 71 #include <net/bpf.h> 72 #include <net/ethernet.h> 73 #include <net/if.h> 74 #include <net/if_arp.h> 75 #include <net/if_clone.h> 76 #include <net/if_dl.h> 77 #include <net/if_types.h> 78 #include <net/if_var.h> 79 #include <net/if_media.h> 80 #include <net/if_vlan_var.h> 81 #include <net/radix.h> 82 #include <net/route.h> 83 #include <net/vnet.h> 84 85 #if defined(INET) || defined(INET6) 86 #include <net/ethernet.h> 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/ip.h> 90 #include <netinet/ip_carp.h> 91 #ifdef INET 92 #include <net/debugnet.h> 93 #include <netinet/if_ether.h> 94 #endif /* INET */ 95 #ifdef INET6 96 #include <netinet6/in6_var.h> 97 #include <netinet6/in6_ifattach.h> 98 #endif /* INET6 */ 99 #endif /* INET || INET6 */ 100 101 #include <security/mac/mac_framework.h> 102 103 /* 104 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 105 * and ifr_ifru when it is used in SIOCGIFCONF. 106 */ 107 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 108 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 109 110 __read_mostly epoch_t net_epoch_preempt; 111 #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 static void if_siocaddmulti(void *, int); 275 #ifdef VIMAGE 276 static int if_vmove(struct ifnet *, struct vnet *); 277 #endif 278 279 #ifdef INET6 280 /* 281 * XXX: declare here to avoid to include many inet6 related files.. 282 * should be more generalized? 283 */ 284 extern void nd6_setmtu(struct ifnet *); 285 #endif 286 287 /* ipsec helper hooks */ 288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 289 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 290 291 VNET_DEFINE(int, if_index); 292 int ifqmaxlen = IFQ_MAXLEN; 293 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 294 VNET_DEFINE(struct ifgrouphead, ifg_head); 295 296 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 297 298 /* Table of ifnet by index. */ 299 VNET_DEFINE(struct ifnet **, ifindex_table); 300 301 #define V_if_indexlim VNET(if_indexlim) 302 #define V_ifindex_table VNET(ifindex_table) 303 304 /* 305 * The global network interface list (V_ifnet) and related state (such as 306 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 307 * an rwlock. Either may be acquired shared to stablize the list, but both 308 * must be acquired writable to modify the list. This model allows us to 309 * both stablize the interface list during interrupt thread processing, but 310 * also to stablize it over long-running ioctls, without introducing priority 311 * inversions and deadlocks. 312 */ 313 struct rwlock ifnet_rwlock; 314 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 315 struct sx ifnet_sxlock; 316 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 317 318 /* 319 * The allocation of network interfaces is a rather non-atomic affair; we 320 * need to select an index before we are ready to expose the interface for 321 * use, so will use this pointer value to indicate reservation. 322 */ 323 #define IFNET_HOLD (void *)(uintptr_t)(-1) 324 325 static if_com_alloc_t *if_com_alloc[256]; 326 static if_com_free_t *if_com_free[256]; 327 328 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 329 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 330 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 331 332 struct ifnet * 333 ifnet_byindex(u_short idx) 334 { 335 struct ifnet *ifp; 336 337 if (__predict_false(idx > V_if_index)) 338 return (NULL); 339 340 ifp = *(struct ifnet * const volatile *)(V_ifindex_table + idx); 341 return (__predict_false(ifp == IFNET_HOLD) ? NULL : ifp); 342 } 343 344 struct ifnet * 345 ifnet_byindex_ref(u_short idx) 346 { 347 struct ifnet *ifp; 348 349 NET_EPOCH_ASSERT(); 350 351 ifp = ifnet_byindex(idx); 352 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) 353 return (NULL); 354 if_ref(ifp); 355 return (ifp); 356 } 357 358 /* 359 * Allocate an ifindex array entry; return 0 on success or an error on 360 * failure. 361 */ 362 static u_short 363 ifindex_alloc(void **old) 364 { 365 u_short idx; 366 367 IFNET_WLOCK_ASSERT(); 368 /* 369 * Try to find an empty slot below V_if_index. If we fail, take the 370 * next slot. 371 */ 372 for (idx = 1; idx <= V_if_index; idx++) { 373 if (V_ifindex_table[idx] == NULL) 374 break; 375 } 376 377 /* Catch if_index overflow. */ 378 if (idx >= V_if_indexlim) { 379 *old = if_grow(); 380 return (USHRT_MAX); 381 } 382 if (idx > V_if_index) 383 V_if_index = idx; 384 return (idx); 385 } 386 387 static void 388 ifindex_free_locked(u_short idx) 389 { 390 391 IFNET_WLOCK_ASSERT(); 392 393 V_ifindex_table[idx] = NULL; 394 while (V_if_index > 0 && 395 V_ifindex_table[V_if_index] == NULL) 396 V_if_index--; 397 } 398 399 static void 400 ifindex_free(u_short idx) 401 { 402 403 IFNET_WLOCK(); 404 ifindex_free_locked(idx); 405 IFNET_WUNLOCK(); 406 } 407 408 static void 409 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 410 { 411 412 V_ifindex_table[idx] = ifp; 413 } 414 415 struct ifaddr * 416 ifaddr_byindex(u_short idx) 417 { 418 struct ifnet *ifp; 419 struct ifaddr *ifa = NULL; 420 421 NET_EPOCH_ASSERT(); 422 423 ifp = ifnet_byindex(idx); 424 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 425 ifa_ref(ifa); 426 return (ifa); 427 } 428 429 /* 430 * Network interface utility routines. 431 * 432 * Routines with ifa_ifwith* names take sockaddr *'s as 433 * parameters. 434 */ 435 436 static void 437 vnet_if_init(const void *unused __unused) 438 { 439 void *old; 440 441 CK_STAILQ_INIT(&V_ifnet); 442 CK_STAILQ_INIT(&V_ifg_head); 443 IFNET_WLOCK(); 444 old = if_grow(); /* create initial table */ 445 IFNET_WUNLOCK(); 446 epoch_wait_preempt(net_epoch_preempt); 447 free(old, M_IFNET); 448 vnet_if_clone_init(); 449 } 450 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 451 NULL); 452 453 #ifdef VIMAGE 454 static void 455 vnet_if_uninit(const void *unused __unused) 456 { 457 458 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 459 "not empty", __func__, __LINE__, &V_ifnet)); 460 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 461 "not empty", __func__, __LINE__, &V_ifg_head)); 462 463 free((caddr_t)V_ifindex_table, M_IFNET); 464 } 465 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 466 vnet_if_uninit, NULL); 467 468 static void 469 vnet_if_return(const void *unused __unused) 470 { 471 struct ifnet *ifp, *nifp; 472 473 /* Return all inherited interfaces to their parent vnets. */ 474 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 475 if (ifp->if_home_vnet != ifp->if_vnet) 476 if_vmove(ifp, ifp->if_home_vnet); 477 } 478 } 479 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 480 vnet_if_return, NULL); 481 #endif 482 483 484 static void * 485 if_grow(void) 486 { 487 int oldlim; 488 u_int n; 489 struct ifnet **e; 490 void *old; 491 492 old = NULL; 493 IFNET_WLOCK_ASSERT(); 494 oldlim = V_if_indexlim; 495 IFNET_WUNLOCK(); 496 n = (oldlim << 1) * sizeof(*e); 497 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 498 IFNET_WLOCK(); 499 if (V_if_indexlim != oldlim) { 500 free(e, M_IFNET); 501 return (NULL); 502 } 503 if (V_ifindex_table != NULL) { 504 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 505 old = V_ifindex_table; 506 } 507 V_if_indexlim <<= 1; 508 V_ifindex_table = e; 509 return (old); 510 } 511 512 /* 513 * Allocate a struct ifnet and an index for an interface. A layer 2 514 * common structure will also be allocated if an allocation routine is 515 * registered for the passed type. 516 */ 517 struct ifnet * 518 if_alloc_domain(u_char type, int numa_domain) 519 { 520 struct ifnet *ifp; 521 u_short idx; 522 void *old; 523 524 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 525 if (numa_domain == IF_NODOM) 526 ifp = malloc(sizeof(struct ifnet), M_IFNET, 527 M_WAITOK | M_ZERO); 528 else 529 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 530 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 531 restart: 532 IFNET_WLOCK(); 533 idx = ifindex_alloc(&old); 534 if (__predict_false(idx == USHRT_MAX)) { 535 IFNET_WUNLOCK(); 536 epoch_wait_preempt(net_epoch_preempt); 537 free(old, M_IFNET); 538 goto restart; 539 } 540 ifnet_setbyindex(idx, IFNET_HOLD); 541 IFNET_WUNLOCK(); 542 ifp->if_index = idx; 543 ifp->if_type = type; 544 ifp->if_alloctype = type; 545 ifp->if_numa_domain = numa_domain; 546 #ifdef VIMAGE 547 ifp->if_vnet = curvnet; 548 #endif 549 if (if_com_alloc[type] != NULL) { 550 ifp->if_l2com = if_com_alloc[type](type, ifp); 551 if (ifp->if_l2com == NULL) { 552 free(ifp, M_IFNET); 553 ifindex_free(idx); 554 return (NULL); 555 } 556 } 557 558 IF_ADDR_LOCK_INIT(ifp); 559 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 560 TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp); 561 ifp->if_afdata_initialized = 0; 562 IF_AFDATA_LOCK_INIT(ifp); 563 CK_STAILQ_INIT(&ifp->if_addrhead); 564 CK_STAILQ_INIT(&ifp->if_multiaddrs); 565 CK_STAILQ_INIT(&ifp->if_groups); 566 #ifdef MAC 567 mac_ifnet_init(ifp); 568 #endif 569 ifq_init(&ifp->if_snd, ifp); 570 571 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 572 for (int i = 0; i < IFCOUNTERS; i++) 573 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 574 ifp->if_get_counter = if_get_counter_default; 575 ifp->if_pcp = IFNET_PCP_NONE; 576 ifnet_setbyindex(ifp->if_index, ifp); 577 return (ifp); 578 } 579 580 struct ifnet * 581 if_alloc_dev(u_char type, device_t dev) 582 { 583 int numa_domain; 584 585 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 586 return (if_alloc_domain(type, IF_NODOM)); 587 return (if_alloc_domain(type, numa_domain)); 588 } 589 590 struct ifnet * 591 if_alloc(u_char type) 592 { 593 594 return (if_alloc_domain(type, IF_NODOM)); 595 } 596 /* 597 * Do the actual work of freeing a struct ifnet, and layer 2 common 598 * structure. This call is made when the last reference to an 599 * interface is released. 600 */ 601 static void 602 if_free_internal(struct ifnet *ifp) 603 { 604 605 KASSERT((ifp->if_flags & IFF_DYING), 606 ("if_free_internal: interface not dying")); 607 608 if (if_com_free[ifp->if_alloctype] != NULL) 609 if_com_free[ifp->if_alloctype](ifp->if_l2com, 610 ifp->if_alloctype); 611 612 #ifdef MAC 613 mac_ifnet_destroy(ifp); 614 #endif /* MAC */ 615 IF_AFDATA_DESTROY(ifp); 616 IF_ADDR_LOCK_DESTROY(ifp); 617 ifq_delete(&ifp->if_snd); 618 619 for (int i = 0; i < IFCOUNTERS; i++) 620 counter_u64_free(ifp->if_counters[i]); 621 622 free(ifp->if_description, M_IFDESCR); 623 free(ifp->if_hw_addr, M_IFADDR); 624 if (ifp->if_numa_domain == IF_NODOM) 625 free(ifp, M_IFNET); 626 else 627 free_domain(ifp, M_IFNET); 628 } 629 630 static void 631 if_destroy(epoch_context_t ctx) 632 { 633 struct ifnet *ifp; 634 635 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 636 if_free_internal(ifp); 637 } 638 639 /* 640 * Deregister an interface and free the associated storage. 641 */ 642 void 643 if_free(struct ifnet *ifp) 644 { 645 646 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 647 648 CURVNET_SET_QUIET(ifp->if_vnet); 649 IFNET_WLOCK(); 650 KASSERT(ifp == ifnet_byindex(ifp->if_index), 651 ("%s: freeing unallocated ifnet", ifp->if_xname)); 652 653 ifindex_free_locked(ifp->if_index); 654 IFNET_WUNLOCK(); 655 656 if (refcount_release(&ifp->if_refcount)) 657 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 658 CURVNET_RESTORE(); 659 } 660 661 /* 662 * Interfaces to keep an ifnet type-stable despite the possibility of the 663 * driver calling if_free(). If there are additional references, we defer 664 * freeing the underlying data structure. 665 */ 666 void 667 if_ref(struct ifnet *ifp) 668 { 669 670 /* We don't assert the ifnet list lock here, but arguably should. */ 671 refcount_acquire(&ifp->if_refcount); 672 } 673 674 void 675 if_rele(struct ifnet *ifp) 676 { 677 678 if (!refcount_release(&ifp->if_refcount)) 679 return; 680 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 681 } 682 683 void 684 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 685 { 686 687 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 688 689 if (ifq->ifq_maxlen == 0) 690 ifq->ifq_maxlen = ifqmaxlen; 691 692 ifq->altq_type = 0; 693 ifq->altq_disc = NULL; 694 ifq->altq_flags &= ALTQF_CANTCHANGE; 695 ifq->altq_tbr = NULL; 696 ifq->altq_ifp = ifp; 697 } 698 699 void 700 ifq_delete(struct ifaltq *ifq) 701 { 702 mtx_destroy(&ifq->ifq_mtx); 703 } 704 705 /* 706 * Perform generic interface initialization tasks and attach the interface 707 * to the list of "active" interfaces. If vmove flag is set on entry 708 * to if_attach_internal(), perform only a limited subset of initialization 709 * tasks, given that we are moving from one vnet to another an ifnet which 710 * has already been fully initialized. 711 * 712 * Note that if_detach_internal() removes group membership unconditionally 713 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 714 * Thus, when if_vmove() is applied to a cloned interface, group membership 715 * is lost while a cloned one always joins a group whose name is 716 * ifc->ifc_name. To recover this after if_detach_internal() and 717 * if_attach_internal(), the cloner should be specified to 718 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 719 * attempts to join a group whose name is ifc->ifc_name. 720 * 721 * XXX: 722 * - The decision to return void and thus require this function to 723 * succeed is questionable. 724 * - We should probably do more sanity checking. For instance we don't 725 * do anything to insure if_xname is unique or non-empty. 726 */ 727 void 728 if_attach(struct ifnet *ifp) 729 { 730 731 if_attach_internal(ifp, 0, NULL); 732 } 733 734 /* 735 * Compute the least common TSO limit. 736 */ 737 void 738 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 739 { 740 /* 741 * 1) If there is no limit currently, take the limit from 742 * the network adapter. 743 * 744 * 2) If the network adapter has a limit below the current 745 * limit, apply it. 746 */ 747 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 748 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 749 pmax->tsomaxbytes = ifp->if_hw_tsomax; 750 } 751 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 752 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 753 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 754 } 755 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 756 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 757 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 758 } 759 } 760 761 /* 762 * Update TSO limit of a network adapter. 763 * 764 * Returns zero if no change. Else non-zero. 765 */ 766 int 767 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 768 { 769 int retval = 0; 770 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 771 ifp->if_hw_tsomax = pmax->tsomaxbytes; 772 retval++; 773 } 774 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 775 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 776 retval++; 777 } 778 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 779 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 780 retval++; 781 } 782 return (retval); 783 } 784 785 static void 786 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 787 { 788 unsigned socksize, ifasize; 789 int namelen, masklen; 790 struct sockaddr_dl *sdl; 791 struct ifaddr *ifa; 792 793 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 794 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 795 ifp->if_xname); 796 797 #ifdef VIMAGE 798 ifp->if_vnet = curvnet; 799 if (ifp->if_home_vnet == NULL) 800 ifp->if_home_vnet = curvnet; 801 #endif 802 803 if_addgroup(ifp, IFG_ALL); 804 805 /* Restore group membership for cloned interfaces. */ 806 if (vmove && ifc != NULL) 807 if_clone_addgroup(ifp, ifc); 808 809 getmicrotime(&ifp->if_lastchange); 810 ifp->if_epoch = time_uptime; 811 812 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 813 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 814 ("transmit and qflush must both either be set or both be NULL")); 815 if (ifp->if_transmit == NULL) { 816 ifp->if_transmit = if_transmit; 817 ifp->if_qflush = if_qflush; 818 } 819 if (ifp->if_input == NULL) 820 ifp->if_input = if_input_default; 821 822 if (ifp->if_requestencap == NULL) 823 ifp->if_requestencap = if_requestencap_default; 824 825 if (!vmove) { 826 #ifdef MAC 827 mac_ifnet_create(ifp); 828 #endif 829 830 /* 831 * Create a Link Level name for this device. 832 */ 833 namelen = strlen(ifp->if_xname); 834 /* 835 * Always save enough space for any possiable name so we 836 * can do a rename in place later. 837 */ 838 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 839 socksize = masklen + ifp->if_addrlen; 840 if (socksize < sizeof(*sdl)) 841 socksize = sizeof(*sdl); 842 socksize = roundup2(socksize, sizeof(long)); 843 ifasize = sizeof(*ifa) + 2 * socksize; 844 ifa = ifa_alloc(ifasize, M_WAITOK); 845 sdl = (struct sockaddr_dl *)(ifa + 1); 846 sdl->sdl_len = socksize; 847 sdl->sdl_family = AF_LINK; 848 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 849 sdl->sdl_nlen = namelen; 850 sdl->sdl_index = ifp->if_index; 851 sdl->sdl_type = ifp->if_type; 852 ifp->if_addr = ifa; 853 ifa->ifa_ifp = ifp; 854 ifa->ifa_addr = (struct sockaddr *)sdl; 855 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 856 ifa->ifa_netmask = (struct sockaddr *)sdl; 857 sdl->sdl_len = masklen; 858 while (namelen != 0) 859 sdl->sdl_data[--namelen] = 0xff; 860 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 861 /* Reliably crash if used uninitialized. */ 862 ifp->if_broadcastaddr = NULL; 863 864 if (ifp->if_type == IFT_ETHER) { 865 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 866 M_WAITOK | M_ZERO); 867 } 868 869 #if defined(INET) || defined(INET6) 870 /* Use defaults for TSO, if nothing is set */ 871 if (ifp->if_hw_tsomax == 0 && 872 ifp->if_hw_tsomaxsegcount == 0 && 873 ifp->if_hw_tsomaxsegsize == 0) { 874 /* 875 * The TSO defaults needs to be such that an 876 * NFS mbuf list of 35 mbufs totalling just 877 * below 64K works and that a chain of mbufs 878 * can be defragged into at most 32 segments: 879 */ 880 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 881 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 882 ifp->if_hw_tsomaxsegcount = 35; 883 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 884 885 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 886 if (ifp->if_capabilities & IFCAP_TSO) { 887 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 888 ifp->if_hw_tsomax, 889 ifp->if_hw_tsomaxsegcount, 890 ifp->if_hw_tsomaxsegsize); 891 } 892 } 893 #endif 894 } 895 #ifdef VIMAGE 896 else { 897 /* 898 * Update the interface index in the link layer address 899 * of the interface. 900 */ 901 for (ifa = ifp->if_addr; ifa != NULL; 902 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 903 if (ifa->ifa_addr->sa_family == AF_LINK) { 904 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 905 sdl->sdl_index = ifp->if_index; 906 } 907 } 908 } 909 #endif 910 911 IFNET_WLOCK(); 912 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 913 #ifdef VIMAGE 914 curvnet->vnet_ifcnt++; 915 #endif 916 IFNET_WUNLOCK(); 917 918 if (domain_init_status >= 2) 919 if_attachdomain1(ifp); 920 921 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 922 if (IS_DEFAULT_VNET(curvnet)) 923 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 924 925 /* Announce the interface. */ 926 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 927 } 928 929 static void 930 if_epochalloc(void *dummy __unused) 931 { 932 933 net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT); 934 } 935 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL); 936 937 static void 938 if_attachdomain(void *dummy) 939 { 940 struct ifnet *ifp; 941 942 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 943 if_attachdomain1(ifp); 944 } 945 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 946 if_attachdomain, NULL); 947 948 static void 949 if_attachdomain1(struct ifnet *ifp) 950 { 951 struct domain *dp; 952 953 /* 954 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 955 * cannot lock ifp->if_afdata initialization, entirely. 956 */ 957 IF_AFDATA_LOCK(ifp); 958 if (ifp->if_afdata_initialized >= domain_init_status) { 959 IF_AFDATA_UNLOCK(ifp); 960 log(LOG_WARNING, "%s called more than once on %s\n", 961 __func__, ifp->if_xname); 962 return; 963 } 964 ifp->if_afdata_initialized = domain_init_status; 965 IF_AFDATA_UNLOCK(ifp); 966 967 /* address family dependent data region */ 968 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 969 for (dp = domains; dp; dp = dp->dom_next) { 970 if (dp->dom_ifattach) 971 ifp->if_afdata[dp->dom_family] = 972 (*dp->dom_ifattach)(ifp); 973 } 974 } 975 976 /* 977 * Remove any unicast or broadcast network addresses from an interface. 978 */ 979 void 980 if_purgeaddrs(struct ifnet *ifp) 981 { 982 struct ifaddr *ifa; 983 984 while (1) { 985 struct epoch_tracker et; 986 987 NET_EPOCH_ENTER(et); 988 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 989 if (ifa->ifa_addr->sa_family != AF_LINK) 990 break; 991 } 992 NET_EPOCH_EXIT(et); 993 994 if (ifa == NULL) 995 break; 996 #ifdef INET 997 /* XXX: Ugly!! ad hoc just for INET */ 998 if (ifa->ifa_addr->sa_family == AF_INET) { 999 struct ifaliasreq ifr; 1000 1001 bzero(&ifr, sizeof(ifr)); 1002 ifr.ifra_addr = *ifa->ifa_addr; 1003 if (ifa->ifa_dstaddr) 1004 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1005 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1006 NULL) == 0) 1007 continue; 1008 } 1009 #endif /* INET */ 1010 #ifdef INET6 1011 if (ifa->ifa_addr->sa_family == AF_INET6) { 1012 in6_purgeaddr(ifa); 1013 /* ifp_addrhead is already updated */ 1014 continue; 1015 } 1016 #endif /* INET6 */ 1017 IF_ADDR_WLOCK(ifp); 1018 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1019 IF_ADDR_WUNLOCK(ifp); 1020 ifa_free(ifa); 1021 } 1022 } 1023 1024 /* 1025 * Remove any multicast network addresses from an interface when an ifnet 1026 * is going away. 1027 */ 1028 static void 1029 if_purgemaddrs(struct ifnet *ifp) 1030 { 1031 struct ifmultiaddr *ifma; 1032 1033 IF_ADDR_WLOCK(ifp); 1034 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1035 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1036 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1037 if_delmulti_locked(ifp, ifma, 1); 1038 } 1039 IF_ADDR_WUNLOCK(ifp); 1040 } 1041 1042 /* 1043 * Detach an interface, removing it from the list of "active" interfaces. 1044 * If vmove flag is set on entry to if_detach_internal(), perform only a 1045 * limited subset of cleanup tasks, given that we are moving an ifnet from 1046 * one vnet to another, where it must be fully operational. 1047 * 1048 * XXXRW: There are some significant questions about event ordering, and 1049 * how to prevent things from starting to use the interface during detach. 1050 */ 1051 void 1052 if_detach(struct ifnet *ifp) 1053 { 1054 1055 CURVNET_SET_QUIET(ifp->if_vnet); 1056 if_detach_internal(ifp, 0, NULL); 1057 CURVNET_RESTORE(); 1058 } 1059 1060 /* 1061 * The vmove flag, if set, indicates that we are called from a callpath 1062 * that is moving an interface to a different vnet instance. 1063 * 1064 * The shutdown flag, if set, indicates that we are called in the 1065 * process of shutting down a vnet instance. Currently only the 1066 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1067 * on a vnet instance shutdown without this flag being set, e.g., when 1068 * the cloned interfaces are destoyed as first thing of teardown. 1069 */ 1070 static int 1071 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1072 { 1073 struct ifaddr *ifa; 1074 int i; 1075 struct domain *dp; 1076 struct ifnet *iter; 1077 int found = 0; 1078 #ifdef VIMAGE 1079 bool shutdown; 1080 1081 shutdown = ifp->if_vnet->vnet_shutdown; 1082 #endif 1083 IFNET_WLOCK(); 1084 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1085 if (iter == ifp) { 1086 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1087 if (!vmove) 1088 ifp->if_flags |= IFF_DYING; 1089 found = 1; 1090 break; 1091 } 1092 IFNET_WUNLOCK(); 1093 if (!found) { 1094 /* 1095 * While we would want to panic here, we cannot 1096 * guarantee that the interface is indeed still on 1097 * the list given we don't hold locks all the way. 1098 */ 1099 return (ENOENT); 1100 #if 0 1101 if (vmove) 1102 panic("%s: ifp=%p not on the ifnet tailq %p", 1103 __func__, ifp, &V_ifnet); 1104 else 1105 return; /* XXX this should panic as well? */ 1106 #endif 1107 } 1108 1109 /* 1110 * At this point we know the interface still was on the ifnet list 1111 * and we removed it so we are in a stable state. 1112 */ 1113 #ifdef VIMAGE 1114 curvnet->vnet_ifcnt--; 1115 #endif 1116 epoch_wait_preempt(net_epoch_preempt); 1117 1118 /* 1119 * Ensure all pending EPOCH(9) callbacks have been executed. This 1120 * fixes issues about late destruction of multicast options 1121 * which lead to leave group calls, which in turn access the 1122 * belonging ifnet structure: 1123 */ 1124 epoch_drain_callbacks(net_epoch_preempt); 1125 1126 /* 1127 * In any case (destroy or vmove) detach us from the groups 1128 * and remove/wait for pending events on the taskq. 1129 * XXX-BZ in theory an interface could still enqueue a taskq change? 1130 */ 1131 if_delgroups(ifp); 1132 1133 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1134 taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask); 1135 1136 /* 1137 * Check if this is a cloned interface or not. Must do even if 1138 * shutting down as a if_vmove_reclaim() would move the ifp and 1139 * the if_clone_addgroup() will have a corrupted string overwise 1140 * from a gibberish pointer. 1141 */ 1142 if (vmove && ifcp != NULL) 1143 *ifcp = if_clone_findifc(ifp); 1144 1145 if_down(ifp); 1146 1147 #ifdef VIMAGE 1148 /* 1149 * On VNET shutdown abort here as the stack teardown will do all 1150 * the work top-down for us. 1151 */ 1152 if (shutdown) { 1153 /* Give interface users the chance to clean up. */ 1154 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1155 1156 /* 1157 * In case of a vmove we are done here without error. 1158 * If we would signal an error it would lead to the same 1159 * abort as if we did not find the ifnet anymore. 1160 * if_detach() calls us in void context and does not care 1161 * about an early abort notification, so life is splendid :) 1162 */ 1163 goto finish_vnet_shutdown; 1164 } 1165 #endif 1166 1167 /* 1168 * At this point we are not tearing down a VNET and are either 1169 * going to destroy or vmove the interface and have to cleanup 1170 * accordingly. 1171 */ 1172 1173 /* 1174 * Remove routes and flush queues. 1175 */ 1176 #ifdef ALTQ 1177 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1178 altq_disable(&ifp->if_snd); 1179 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1180 altq_detach(&ifp->if_snd); 1181 #endif 1182 1183 if_purgeaddrs(ifp); 1184 1185 #ifdef INET 1186 in_ifdetach(ifp); 1187 #endif 1188 1189 #ifdef INET6 1190 /* 1191 * Remove all IPv6 kernel structs related to ifp. This should be done 1192 * before removing routing entries below, since IPv6 interface direct 1193 * routes are expected to be removed by the IPv6-specific kernel API. 1194 * Otherwise, the kernel will detect some inconsistency and bark it. 1195 */ 1196 in6_ifdetach(ifp); 1197 #endif 1198 if_purgemaddrs(ifp); 1199 1200 /* Announce that the interface is gone. */ 1201 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1202 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1203 if (IS_DEFAULT_VNET(curvnet)) 1204 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1205 1206 if (!vmove) { 1207 /* 1208 * Prevent further calls into the device driver via ifnet. 1209 */ 1210 if_dead(ifp); 1211 1212 /* 1213 * Clean up all addresses. 1214 */ 1215 IF_ADDR_WLOCK(ifp); 1216 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1217 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1218 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1219 IF_ADDR_WUNLOCK(ifp); 1220 ifa_free(ifa); 1221 } else 1222 IF_ADDR_WUNLOCK(ifp); 1223 } 1224 1225 rt_flushifroutes(ifp); 1226 1227 #ifdef VIMAGE 1228 finish_vnet_shutdown: 1229 #endif 1230 /* 1231 * We cannot hold the lock over dom_ifdetach calls as they might 1232 * sleep, for example trying to drain a callout, thus open up the 1233 * theoretical race with re-attaching. 1234 */ 1235 IF_AFDATA_LOCK(ifp); 1236 i = ifp->if_afdata_initialized; 1237 ifp->if_afdata_initialized = 0; 1238 IF_AFDATA_UNLOCK(ifp); 1239 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1240 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1241 (*dp->dom_ifdetach)(ifp, 1242 ifp->if_afdata[dp->dom_family]); 1243 ifp->if_afdata[dp->dom_family] = NULL; 1244 } 1245 } 1246 1247 return (0); 1248 } 1249 1250 #ifdef VIMAGE 1251 /* 1252 * if_vmove() performs a limited version of if_detach() in current 1253 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1254 * An attempt is made to shrink if_index in current vnet, find an 1255 * unused if_index in target vnet and calls if_grow() if necessary, 1256 * and finally find an unused if_xname for the target vnet. 1257 */ 1258 static int 1259 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1260 { 1261 struct if_clone *ifc; 1262 #ifdef DEV_BPF 1263 u_int bif_dlt, bif_hdrlen; 1264 #endif 1265 void *old; 1266 int rc; 1267 1268 #ifdef DEV_BPF 1269 /* 1270 * if_detach_internal() will call the eventhandler to notify 1271 * interface departure. That will detach if_bpf. We need to 1272 * safe the dlt and hdrlen so we can re-attach it later. 1273 */ 1274 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1275 #endif 1276 1277 /* 1278 * Detach from current vnet, but preserve LLADDR info, do not 1279 * mark as dead etc. so that the ifnet can be reattached later. 1280 * If we cannot find it, we lost the race to someone else. 1281 */ 1282 rc = if_detach_internal(ifp, 1, &ifc); 1283 if (rc != 0) 1284 return (rc); 1285 1286 /* 1287 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1288 * the if_index for that vnet if possible. 1289 * 1290 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1291 * or we'd lock on one vnet and unlock on another. 1292 */ 1293 IFNET_WLOCK(); 1294 ifindex_free_locked(ifp->if_index); 1295 IFNET_WUNLOCK(); 1296 1297 /* 1298 * Perform interface-specific reassignment tasks, if provided by 1299 * the driver. 1300 */ 1301 if (ifp->if_reassign != NULL) 1302 ifp->if_reassign(ifp, new_vnet, NULL); 1303 1304 /* 1305 * Switch to the context of the target vnet. 1306 */ 1307 CURVNET_SET_QUIET(new_vnet); 1308 restart: 1309 IFNET_WLOCK(); 1310 ifp->if_index = ifindex_alloc(&old); 1311 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1312 IFNET_WUNLOCK(); 1313 epoch_wait_preempt(net_epoch_preempt); 1314 free(old, M_IFNET); 1315 goto restart; 1316 } 1317 ifnet_setbyindex(ifp->if_index, ifp); 1318 IFNET_WUNLOCK(); 1319 1320 if_attach_internal(ifp, 1, ifc); 1321 1322 #ifdef DEV_BPF 1323 if (ifp->if_bpf == NULL) 1324 bpfattach(ifp, bif_dlt, bif_hdrlen); 1325 #endif 1326 1327 CURVNET_RESTORE(); 1328 return (0); 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 int error; 1340 1341 /* Try to find the prison within our visibility. */ 1342 sx_slock(&allprison_lock); 1343 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1344 sx_sunlock(&allprison_lock); 1345 if (pr == NULL) 1346 return (ENXIO); 1347 prison_hold_locked(pr); 1348 mtx_unlock(&pr->pr_mtx); 1349 1350 /* Do not try to move the iface from and to the same prison. */ 1351 if (pr->pr_vnet == ifp->if_vnet) { 1352 prison_free(pr); 1353 return (EEXIST); 1354 } 1355 1356 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1357 /* XXX Lock interfaces to avoid races. */ 1358 CURVNET_SET_QUIET(pr->pr_vnet); 1359 difp = ifunit(ifname); 1360 if (difp != NULL) { 1361 CURVNET_RESTORE(); 1362 prison_free(pr); 1363 return (EEXIST); 1364 } 1365 1366 /* Make sure the VNET is stable. */ 1367 if (ifp->if_vnet->vnet_shutdown) { 1368 CURVNET_RESTORE(); 1369 prison_free(pr); 1370 return (EBUSY); 1371 } 1372 CURVNET_RESTORE(); 1373 1374 /* Move the interface into the child jail/vnet. */ 1375 error = if_vmove(ifp, pr->pr_vnet); 1376 1377 /* Report the new if_xname back to the userland on success. */ 1378 if (error == 0) 1379 sprintf(ifname, "%s", ifp->if_xname); 1380 1381 prison_free(pr); 1382 return (error); 1383 } 1384 1385 static int 1386 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1387 { 1388 struct prison *pr; 1389 struct vnet *vnet_dst; 1390 struct ifnet *ifp; 1391 int error; 1392 1393 /* Try to find the prison within our visibility. */ 1394 sx_slock(&allprison_lock); 1395 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1396 sx_sunlock(&allprison_lock); 1397 if (pr == NULL) 1398 return (ENXIO); 1399 prison_hold_locked(pr); 1400 mtx_unlock(&pr->pr_mtx); 1401 1402 /* Make sure the named iface exists in the source prison/vnet. */ 1403 CURVNET_SET(pr->pr_vnet); 1404 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1405 if (ifp == NULL) { 1406 CURVNET_RESTORE(); 1407 prison_free(pr); 1408 return (ENXIO); 1409 } 1410 1411 /* Do not try to move the iface from and to the same prison. */ 1412 vnet_dst = TD_TO_VNET(td); 1413 if (vnet_dst == ifp->if_vnet) { 1414 CURVNET_RESTORE(); 1415 prison_free(pr); 1416 return (EEXIST); 1417 } 1418 1419 /* Make sure the VNET is stable. */ 1420 if (ifp->if_vnet->vnet_shutdown) { 1421 CURVNET_RESTORE(); 1422 prison_free(pr); 1423 return (EBUSY); 1424 } 1425 1426 /* Get interface back from child jail/vnet. */ 1427 error = if_vmove(ifp, vnet_dst); 1428 CURVNET_RESTORE(); 1429 1430 /* Report the new if_xname back to the userland on success. */ 1431 if (error == 0) 1432 sprintf(ifname, "%s", ifp->if_xname); 1433 1434 prison_free(pr); 1435 return (error); 1436 } 1437 #endif /* VIMAGE */ 1438 1439 /* 1440 * Add a group to an interface 1441 */ 1442 int 1443 if_addgroup(struct ifnet *ifp, const char *groupname) 1444 { 1445 struct ifg_list *ifgl; 1446 struct ifg_group *ifg = NULL; 1447 struct ifg_member *ifgm; 1448 int new = 0; 1449 1450 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1451 groupname[strlen(groupname) - 1] <= '9') 1452 return (EINVAL); 1453 1454 IFNET_WLOCK(); 1455 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1456 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1457 IFNET_WUNLOCK(); 1458 return (EEXIST); 1459 } 1460 1461 if ((ifgl = malloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) { 1462 IFNET_WUNLOCK(); 1463 return (ENOMEM); 1464 } 1465 1466 if ((ifgm = malloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) { 1467 free(ifgl, M_TEMP); 1468 IFNET_WUNLOCK(); 1469 return (ENOMEM); 1470 } 1471 1472 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1473 if (!strcmp(ifg->ifg_group, groupname)) 1474 break; 1475 1476 if (ifg == NULL) { 1477 if ((ifg = malloc(sizeof(*ifg), M_TEMP, M_NOWAIT)) == NULL) { 1478 free(ifgl, M_TEMP); 1479 free(ifgm, M_TEMP); 1480 IFNET_WUNLOCK(); 1481 return (ENOMEM); 1482 } 1483 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1484 ifg->ifg_refcnt = 0; 1485 CK_STAILQ_INIT(&ifg->ifg_members); 1486 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1487 new = 1; 1488 } 1489 1490 ifg->ifg_refcnt++; 1491 ifgl->ifgl_group = ifg; 1492 ifgm->ifgm_ifp = ifp; 1493 1494 IF_ADDR_WLOCK(ifp); 1495 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1496 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1497 IF_ADDR_WUNLOCK(ifp); 1498 1499 IFNET_WUNLOCK(); 1500 1501 if (new) 1502 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1503 EVENTHANDLER_INVOKE(group_change_event, groupname); 1504 1505 return (0); 1506 } 1507 1508 /* 1509 * Helper function to remove a group out of an interface. Expects the global 1510 * ifnet lock to be write-locked, and drops it before returning. 1511 */ 1512 static void 1513 _if_delgroup_locked(struct ifnet *ifp, struct ifg_list *ifgl, 1514 const char *groupname) 1515 { 1516 struct ifg_member *ifgm; 1517 bool freeifgl; 1518 1519 IFNET_WLOCK_ASSERT(); 1520 1521 IF_ADDR_WLOCK(ifp); 1522 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1523 IF_ADDR_WUNLOCK(ifp); 1524 1525 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) { 1526 if (ifgm->ifgm_ifp == ifp) { 1527 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1528 ifg_member, ifgm_next); 1529 break; 1530 } 1531 } 1532 1533 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1534 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, 1535 ifg_next); 1536 freeifgl = true; 1537 } else { 1538 freeifgl = false; 1539 } 1540 IFNET_WUNLOCK(); 1541 1542 epoch_wait_preempt(net_epoch_preempt); 1543 if (freeifgl) { 1544 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1545 free(ifgl->ifgl_group, M_TEMP); 1546 } 1547 free(ifgm, M_TEMP); 1548 free(ifgl, M_TEMP); 1549 1550 EVENTHANDLER_INVOKE(group_change_event, groupname); 1551 } 1552 1553 /* 1554 * Remove a group from an interface 1555 */ 1556 int 1557 if_delgroup(struct ifnet *ifp, const char *groupname) 1558 { 1559 struct ifg_list *ifgl; 1560 1561 IFNET_WLOCK(); 1562 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1563 if (strcmp(ifgl->ifgl_group->ifg_group, groupname) == 0) 1564 break; 1565 if (ifgl == NULL) { 1566 IFNET_WUNLOCK(); 1567 return (ENOENT); 1568 } 1569 1570 _if_delgroup_locked(ifp, ifgl, groupname); 1571 1572 return (0); 1573 } 1574 1575 /* 1576 * Remove an interface from all groups 1577 */ 1578 static void 1579 if_delgroups(struct ifnet *ifp) 1580 { 1581 struct ifg_list *ifgl; 1582 char groupname[IFNAMSIZ]; 1583 1584 IFNET_WLOCK(); 1585 while ((ifgl = CK_STAILQ_FIRST(&ifp->if_groups)) != NULL) { 1586 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1587 _if_delgroup_locked(ifp, ifgl, groupname); 1588 IFNET_WLOCK(); 1589 } 1590 IFNET_WUNLOCK(); 1591 } 1592 1593 static char * 1594 ifgr_group_get(void *ifgrp) 1595 { 1596 union ifgroupreq_union *ifgrup; 1597 1598 ifgrup = ifgrp; 1599 #ifdef COMPAT_FREEBSD32 1600 if (SV_CURPROC_FLAG(SV_ILP32)) 1601 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1602 #endif 1603 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1604 } 1605 1606 static struct ifg_req * 1607 ifgr_groups_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 ((struct ifg_req *)(uintptr_t) 1615 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1616 #endif 1617 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1618 } 1619 1620 /* 1621 * Stores all groups from an interface in memory pointed to by ifgr. 1622 */ 1623 static int 1624 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1625 { 1626 int len, error; 1627 struct ifg_list *ifgl; 1628 struct ifg_req ifgrq, *ifgp; 1629 1630 NET_EPOCH_ASSERT(); 1631 1632 if (ifgr->ifgr_len == 0) { 1633 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1634 ifgr->ifgr_len += sizeof(struct ifg_req); 1635 return (0); 1636 } 1637 1638 len = ifgr->ifgr_len; 1639 ifgp = ifgr_groups_get(ifgr); 1640 /* XXX: wire */ 1641 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1642 if (len < sizeof(ifgrq)) 1643 return (EINVAL); 1644 bzero(&ifgrq, sizeof ifgrq); 1645 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1646 sizeof(ifgrq.ifgrq_group)); 1647 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) 1648 return (error); 1649 len -= sizeof(ifgrq); 1650 ifgp++; 1651 } 1652 1653 return (0); 1654 } 1655 1656 /* 1657 * Stores all members of a group in memory pointed to by igfr 1658 */ 1659 static int 1660 if_getgroupmembers(struct ifgroupreq *ifgr) 1661 { 1662 struct ifg_group *ifg; 1663 struct ifg_member *ifgm; 1664 struct ifg_req ifgrq, *ifgp; 1665 int len, error; 1666 1667 IFNET_RLOCK(); 1668 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1669 if (strcmp(ifg->ifg_group, ifgr->ifgr_name) == 0) 1670 break; 1671 if (ifg == NULL) { 1672 IFNET_RUNLOCK(); 1673 return (ENOENT); 1674 } 1675 1676 if (ifgr->ifgr_len == 0) { 1677 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1678 ifgr->ifgr_len += sizeof(ifgrq); 1679 IFNET_RUNLOCK(); 1680 return (0); 1681 } 1682 1683 len = ifgr->ifgr_len; 1684 ifgp = ifgr_groups_get(ifgr); 1685 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1686 if (len < sizeof(ifgrq)) { 1687 IFNET_RUNLOCK(); 1688 return (EINVAL); 1689 } 1690 bzero(&ifgrq, sizeof ifgrq); 1691 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1692 sizeof(ifgrq.ifgrq_member)); 1693 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1694 IFNET_RUNLOCK(); 1695 return (error); 1696 } 1697 len -= sizeof(ifgrq); 1698 ifgp++; 1699 } 1700 IFNET_RUNLOCK(); 1701 1702 return (0); 1703 } 1704 1705 /* 1706 * Return counter values from counter(9)s stored in ifnet. 1707 */ 1708 uint64_t 1709 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1710 { 1711 1712 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1713 1714 return (counter_u64_fetch(ifp->if_counters[cnt])); 1715 } 1716 1717 /* 1718 * Increase an ifnet counter. Usually used for counters shared 1719 * between the stack and a driver, but function supports them all. 1720 */ 1721 void 1722 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1723 { 1724 1725 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1726 1727 counter_u64_add(ifp->if_counters[cnt], inc); 1728 } 1729 1730 /* 1731 * Copy data from ifnet to userland API structure if_data. 1732 */ 1733 void 1734 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1735 { 1736 1737 ifd->ifi_type = ifp->if_type; 1738 ifd->ifi_physical = 0; 1739 ifd->ifi_addrlen = ifp->if_addrlen; 1740 ifd->ifi_hdrlen = ifp->if_hdrlen; 1741 ifd->ifi_link_state = ifp->if_link_state; 1742 ifd->ifi_vhid = 0; 1743 ifd->ifi_datalen = sizeof(struct if_data); 1744 ifd->ifi_mtu = ifp->if_mtu; 1745 ifd->ifi_metric = ifp->if_metric; 1746 ifd->ifi_baudrate = ifp->if_baudrate; 1747 ifd->ifi_hwassist = ifp->if_hwassist; 1748 ifd->ifi_epoch = ifp->if_epoch; 1749 ifd->ifi_lastchange = ifp->if_lastchange; 1750 1751 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1752 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1753 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1754 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1755 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1756 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1757 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1758 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1759 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1760 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1761 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1762 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1763 } 1764 1765 /* 1766 * Initialization, destruction and refcounting functions for ifaddrs. 1767 */ 1768 struct ifaddr * 1769 ifa_alloc(size_t size, int flags) 1770 { 1771 struct ifaddr *ifa; 1772 1773 KASSERT(size >= sizeof(struct ifaddr), 1774 ("%s: invalid size %zu", __func__, size)); 1775 1776 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1777 if (ifa == NULL) 1778 return (NULL); 1779 1780 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1781 goto fail; 1782 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1783 goto fail; 1784 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1785 goto fail; 1786 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1787 goto fail; 1788 1789 refcount_init(&ifa->ifa_refcnt, 1); 1790 1791 return (ifa); 1792 1793 fail: 1794 /* free(NULL) is okay */ 1795 counter_u64_free(ifa->ifa_opackets); 1796 counter_u64_free(ifa->ifa_ipackets); 1797 counter_u64_free(ifa->ifa_obytes); 1798 counter_u64_free(ifa->ifa_ibytes); 1799 free(ifa, M_IFADDR); 1800 1801 return (NULL); 1802 } 1803 1804 void 1805 ifa_ref(struct ifaddr *ifa) 1806 { 1807 1808 refcount_acquire(&ifa->ifa_refcnt); 1809 } 1810 1811 static void 1812 ifa_destroy(epoch_context_t ctx) 1813 { 1814 struct ifaddr *ifa; 1815 1816 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1817 counter_u64_free(ifa->ifa_opackets); 1818 counter_u64_free(ifa->ifa_ipackets); 1819 counter_u64_free(ifa->ifa_obytes); 1820 counter_u64_free(ifa->ifa_ibytes); 1821 free(ifa, M_IFADDR); 1822 } 1823 1824 void 1825 ifa_free(struct ifaddr *ifa) 1826 { 1827 1828 if (refcount_release(&ifa->ifa_refcnt)) 1829 NET_EPOCH_CALL(ifa_destroy, &ifa->ifa_epoch_ctx); 1830 } 1831 1832 1833 static int 1834 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1835 struct sockaddr *ia) 1836 { 1837 struct epoch_tracker et; 1838 int error; 1839 struct rt_addrinfo info; 1840 struct sockaddr_dl null_sdl; 1841 struct ifnet *ifp; 1842 struct ifaddr *rti_ifa = NULL; 1843 1844 ifp = ifa->ifa_ifp; 1845 1846 bzero(&info, sizeof(info)); 1847 if (cmd != RTM_DELETE) 1848 info.rti_ifp = V_loif; 1849 if (cmd == RTM_ADD) { 1850 /* explicitly specify (loopback) ifa */ 1851 if (info.rti_ifp != NULL) { 1852 NET_EPOCH_ENTER(et); 1853 rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1854 if (rti_ifa != NULL) 1855 ifa_ref(rti_ifa); 1856 info.rti_ifa = rti_ifa; 1857 NET_EPOCH_EXIT(et); 1858 } 1859 } 1860 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1861 info.rti_info[RTAX_DST] = ia; 1862 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1863 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1864 1865 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1866 1867 if (rti_ifa != NULL) 1868 ifa_free(rti_ifa); 1869 1870 if (error == 0 || 1871 (cmd == RTM_ADD && error == EEXIST) || 1872 (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH))) 1873 return (error); 1874 1875 log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n", 1876 __func__, otype, if_name(ifp), error); 1877 1878 return (error); 1879 } 1880 1881 int 1882 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1883 { 1884 1885 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1886 } 1887 1888 int 1889 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1890 { 1891 1892 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1893 } 1894 1895 int 1896 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1897 { 1898 1899 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1900 } 1901 1902 /* 1903 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1904 * structs used to represent other address families, it is necessary 1905 * to perform a different comparison. 1906 */ 1907 1908 #define sa_dl_equal(a1, a2) \ 1909 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1910 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1911 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1912 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1913 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1914 1915 /* 1916 * Locate an interface based on a complete address. 1917 */ 1918 /*ARGSUSED*/ 1919 struct ifaddr * 1920 ifa_ifwithaddr(const struct sockaddr *addr) 1921 { 1922 struct ifnet *ifp; 1923 struct ifaddr *ifa; 1924 1925 NET_EPOCH_ASSERT(); 1926 1927 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1928 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1929 if (ifa->ifa_addr->sa_family != addr->sa_family) 1930 continue; 1931 if (sa_equal(addr, ifa->ifa_addr)) { 1932 goto done; 1933 } 1934 /* IP6 doesn't have broadcast */ 1935 if ((ifp->if_flags & IFF_BROADCAST) && 1936 ifa->ifa_broadaddr && 1937 ifa->ifa_broadaddr->sa_len != 0 && 1938 sa_equal(ifa->ifa_broadaddr, addr)) { 1939 goto done; 1940 } 1941 } 1942 } 1943 ifa = NULL; 1944 done: 1945 return (ifa); 1946 } 1947 1948 int 1949 ifa_ifwithaddr_check(const struct sockaddr *addr) 1950 { 1951 struct epoch_tracker et; 1952 int rc; 1953 1954 NET_EPOCH_ENTER(et); 1955 rc = (ifa_ifwithaddr(addr) != NULL); 1956 NET_EPOCH_EXIT(et); 1957 return (rc); 1958 } 1959 1960 /* 1961 * Locate an interface based on the broadcast address. 1962 */ 1963 /* ARGSUSED */ 1964 struct ifaddr * 1965 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1966 { 1967 struct ifnet *ifp; 1968 struct ifaddr *ifa; 1969 1970 NET_EPOCH_ASSERT(); 1971 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1972 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1973 continue; 1974 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1975 if (ifa->ifa_addr->sa_family != addr->sa_family) 1976 continue; 1977 if ((ifp->if_flags & IFF_BROADCAST) && 1978 ifa->ifa_broadaddr && 1979 ifa->ifa_broadaddr->sa_len != 0 && 1980 sa_equal(ifa->ifa_broadaddr, addr)) { 1981 goto done; 1982 } 1983 } 1984 } 1985 ifa = NULL; 1986 done: 1987 return (ifa); 1988 } 1989 1990 /* 1991 * Locate the point to point interface with a given destination address. 1992 */ 1993 /*ARGSUSED*/ 1994 struct ifaddr * 1995 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 1996 { 1997 struct ifnet *ifp; 1998 struct ifaddr *ifa; 1999 2000 NET_EPOCH_ASSERT(); 2001 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2002 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2003 continue; 2004 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2005 continue; 2006 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2007 if (ifa->ifa_addr->sa_family != addr->sa_family) 2008 continue; 2009 if (ifa->ifa_dstaddr != NULL && 2010 sa_equal(addr, ifa->ifa_dstaddr)) { 2011 goto done; 2012 } 2013 } 2014 } 2015 ifa = NULL; 2016 done: 2017 return (ifa); 2018 } 2019 2020 /* 2021 * Find an interface on a specific network. If many, choice 2022 * is most specific found. 2023 */ 2024 struct ifaddr * 2025 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2026 { 2027 struct ifnet *ifp; 2028 struct ifaddr *ifa; 2029 struct ifaddr *ifa_maybe = NULL; 2030 u_int af = addr->sa_family; 2031 const char *addr_data = addr->sa_data, *cplim; 2032 2033 NET_EPOCH_ASSERT(); 2034 /* 2035 * AF_LINK addresses can be looked up directly by their index number, 2036 * so do that if we can. 2037 */ 2038 if (af == AF_LINK) { 2039 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2040 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2041 return (ifaddr_byindex(sdl->sdl_index)); 2042 } 2043 2044 /* 2045 * Scan though each interface, looking for ones that have addresses 2046 * in this address family and the requested fib. 2047 */ 2048 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2049 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2050 continue; 2051 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2052 const char *cp, *cp2, *cp3; 2053 2054 if (ifa->ifa_addr->sa_family != af) 2055 next: continue; 2056 if (af == AF_INET && 2057 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2058 /* 2059 * This is a bit broken as it doesn't 2060 * take into account that the remote end may 2061 * be a single node in the network we are 2062 * looking for. 2063 * The trouble is that we don't know the 2064 * netmask for the remote end. 2065 */ 2066 if (ifa->ifa_dstaddr != NULL && 2067 sa_equal(addr, ifa->ifa_dstaddr)) { 2068 goto done; 2069 } 2070 } else { 2071 /* 2072 * Scan all the bits in the ifa's address. 2073 * If a bit dissagrees with what we are 2074 * looking for, mask it with the netmask 2075 * to see if it really matters. 2076 * (A byte at a time) 2077 */ 2078 if (ifa->ifa_netmask == 0) 2079 continue; 2080 cp = addr_data; 2081 cp2 = ifa->ifa_addr->sa_data; 2082 cp3 = ifa->ifa_netmask->sa_data; 2083 cplim = ifa->ifa_netmask->sa_len 2084 + (char *)ifa->ifa_netmask; 2085 while (cp3 < cplim) 2086 if ((*cp++ ^ *cp2++) & *cp3++) 2087 goto next; /* next address! */ 2088 /* 2089 * If the netmask of what we just found 2090 * is more specific than what we had before 2091 * (if we had one), or if the virtual status 2092 * of new prefix is better than of the old one, 2093 * then remember the new one before continuing 2094 * to search for an even better one. 2095 */ 2096 if (ifa_maybe == NULL || 2097 ifa_preferred(ifa_maybe, ifa) || 2098 rn_refines((caddr_t)ifa->ifa_netmask, 2099 (caddr_t)ifa_maybe->ifa_netmask)) { 2100 ifa_maybe = ifa; 2101 } 2102 } 2103 } 2104 } 2105 ifa = ifa_maybe; 2106 ifa_maybe = NULL; 2107 done: 2108 return (ifa); 2109 } 2110 2111 /* 2112 * Find an interface address specific to an interface best matching 2113 * a given address. 2114 */ 2115 struct ifaddr * 2116 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2117 { 2118 struct ifaddr *ifa; 2119 const char *cp, *cp2, *cp3; 2120 char *cplim; 2121 struct ifaddr *ifa_maybe = NULL; 2122 u_int af = addr->sa_family; 2123 2124 if (af >= AF_MAX) 2125 return (NULL); 2126 2127 NET_EPOCH_ASSERT(); 2128 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2129 if (ifa->ifa_addr->sa_family != af) 2130 continue; 2131 if (ifa_maybe == NULL) 2132 ifa_maybe = ifa; 2133 if (ifa->ifa_netmask == 0) { 2134 if (sa_equal(addr, ifa->ifa_addr) || 2135 (ifa->ifa_dstaddr && 2136 sa_equal(addr, ifa->ifa_dstaddr))) 2137 goto done; 2138 continue; 2139 } 2140 if (ifp->if_flags & IFF_POINTOPOINT) { 2141 if (sa_equal(addr, ifa->ifa_dstaddr)) 2142 goto done; 2143 } else { 2144 cp = addr->sa_data; 2145 cp2 = ifa->ifa_addr->sa_data; 2146 cp3 = ifa->ifa_netmask->sa_data; 2147 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2148 for (; cp3 < cplim; cp3++) 2149 if ((*cp++ ^ *cp2++) & *cp3) 2150 break; 2151 if (cp3 == cplim) 2152 goto done; 2153 } 2154 } 2155 ifa = ifa_maybe; 2156 done: 2157 return (ifa); 2158 } 2159 2160 /* 2161 * See whether new ifa is better than current one: 2162 * 1) A non-virtual one is preferred over virtual. 2163 * 2) A virtual in master state preferred over any other state. 2164 * 2165 * Used in several address selecting functions. 2166 */ 2167 int 2168 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2169 { 2170 2171 return (cur->ifa_carp && (!next->ifa_carp || 2172 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2173 } 2174 2175 struct sockaddr_dl * 2176 link_alloc_sdl(size_t size, int flags) 2177 { 2178 2179 return (malloc(size, M_TEMP, flags)); 2180 } 2181 2182 void 2183 link_free_sdl(struct sockaddr *sa) 2184 { 2185 free(sa, M_TEMP); 2186 } 2187 2188 /* 2189 * Fills in given sdl with interface basic info. 2190 * Returns pointer to filled sdl. 2191 */ 2192 struct sockaddr_dl * 2193 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2194 { 2195 struct sockaddr_dl *sdl; 2196 2197 sdl = (struct sockaddr_dl *)paddr; 2198 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2199 sdl->sdl_len = sizeof(struct sockaddr_dl); 2200 sdl->sdl_family = AF_LINK; 2201 sdl->sdl_index = ifp->if_index; 2202 sdl->sdl_type = iftype; 2203 2204 return (sdl); 2205 } 2206 2207 /* 2208 * Mark an interface down and notify protocols of 2209 * the transition. 2210 */ 2211 static void 2212 if_unroute(struct ifnet *ifp, int flag, int fam) 2213 { 2214 struct ifaddr *ifa; 2215 2216 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2217 2218 ifp->if_flags &= ~flag; 2219 getmicrotime(&ifp->if_lastchange); 2220 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2221 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2222 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2223 ifp->if_qflush(ifp); 2224 2225 if (ifp->if_carp) 2226 (*carp_linkstate_p)(ifp); 2227 rt_ifmsg(ifp); 2228 } 2229 2230 /* 2231 * Mark an interface up and notify protocols of 2232 * the transition. 2233 */ 2234 static void 2235 if_route(struct ifnet *ifp, int flag, int fam) 2236 { 2237 struct ifaddr *ifa; 2238 2239 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2240 2241 ifp->if_flags |= flag; 2242 getmicrotime(&ifp->if_lastchange); 2243 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2244 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2245 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2246 if (ifp->if_carp) 2247 (*carp_linkstate_p)(ifp); 2248 rt_ifmsg(ifp); 2249 #ifdef INET6 2250 in6_if_up(ifp); 2251 #endif 2252 } 2253 2254 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2255 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2256 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2257 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2258 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2259 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2260 int (*vlan_setcookie_p)(struct ifnet *, void *); 2261 void *(*vlan_cookie_p)(struct ifnet *); 2262 2263 /* 2264 * Handle a change in the interface link state. To avoid LORs 2265 * between driver lock and upper layer locks, as well as possible 2266 * recursions, we post event to taskqueue, and all job 2267 * is done in static do_link_state_change(). 2268 */ 2269 void 2270 if_link_state_change(struct ifnet *ifp, int link_state) 2271 { 2272 /* Return if state hasn't changed. */ 2273 if (ifp->if_link_state == link_state) 2274 return; 2275 2276 ifp->if_link_state = link_state; 2277 2278 /* XXXGL: reference ifp? */ 2279 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2280 } 2281 2282 static void 2283 do_link_state_change(void *arg, int pending) 2284 { 2285 struct ifnet *ifp; 2286 int link_state; 2287 2288 ifp = arg; 2289 link_state = ifp->if_link_state; 2290 2291 CURVNET_SET(ifp->if_vnet); 2292 rt_ifmsg(ifp); 2293 if (ifp->if_vlantrunk != NULL) 2294 (*vlan_link_state_p)(ifp); 2295 2296 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2297 ifp->if_l2com != NULL) 2298 (*ng_ether_link_state_p)(ifp, link_state); 2299 if (ifp->if_carp) 2300 (*carp_linkstate_p)(ifp); 2301 if (ifp->if_bridge) 2302 ifp->if_bridge_linkstate(ifp); 2303 if (ifp->if_lagg) 2304 (*lagg_linkstate_p)(ifp, link_state); 2305 2306 if (IS_DEFAULT_VNET(curvnet)) 2307 devctl_notify("IFNET", ifp->if_xname, 2308 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2309 NULL); 2310 if (pending > 1) 2311 if_printf(ifp, "%d link states coalesced\n", pending); 2312 if (log_link_state_change) 2313 if_printf(ifp, "link state changed to %s\n", 2314 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2315 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2316 CURVNET_RESTORE(); 2317 } 2318 2319 /* 2320 * Mark an interface down and notify protocols of 2321 * the transition. 2322 */ 2323 void 2324 if_down(struct ifnet *ifp) 2325 { 2326 2327 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2328 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2329 } 2330 2331 /* 2332 * Mark an interface up and notify protocols of 2333 * the transition. 2334 */ 2335 void 2336 if_up(struct ifnet *ifp) 2337 { 2338 2339 if_route(ifp, IFF_UP, AF_UNSPEC); 2340 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2341 } 2342 2343 /* 2344 * Flush an interface queue. 2345 */ 2346 void 2347 if_qflush(struct ifnet *ifp) 2348 { 2349 struct mbuf *m, *n; 2350 struct ifaltq *ifq; 2351 2352 ifq = &ifp->if_snd; 2353 IFQ_LOCK(ifq); 2354 #ifdef ALTQ 2355 if (ALTQ_IS_ENABLED(ifq)) 2356 ALTQ_PURGE(ifq); 2357 #endif 2358 n = ifq->ifq_head; 2359 while ((m = n) != NULL) { 2360 n = m->m_nextpkt; 2361 m_freem(m); 2362 } 2363 ifq->ifq_head = 0; 2364 ifq->ifq_tail = 0; 2365 ifq->ifq_len = 0; 2366 IFQ_UNLOCK(ifq); 2367 } 2368 2369 /* 2370 * Map interface name to interface structure pointer, with or without 2371 * returning a reference. 2372 */ 2373 struct ifnet * 2374 ifunit_ref(const char *name) 2375 { 2376 struct epoch_tracker et; 2377 struct ifnet *ifp; 2378 2379 NET_EPOCH_ENTER(et); 2380 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2381 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2382 !(ifp->if_flags & IFF_DYING)) 2383 break; 2384 } 2385 if (ifp != NULL) 2386 if_ref(ifp); 2387 NET_EPOCH_EXIT(et); 2388 return (ifp); 2389 } 2390 2391 struct ifnet * 2392 ifunit(const char *name) 2393 { 2394 struct epoch_tracker et; 2395 struct ifnet *ifp; 2396 2397 NET_EPOCH_ENTER(et); 2398 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2399 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2400 break; 2401 } 2402 NET_EPOCH_EXIT(et); 2403 return (ifp); 2404 } 2405 2406 static void * 2407 ifr_buffer_get_buffer(void *data) 2408 { 2409 union ifreq_union *ifrup; 2410 2411 ifrup = data; 2412 #ifdef COMPAT_FREEBSD32 2413 if (SV_CURPROC_FLAG(SV_ILP32)) 2414 return ((void *)(uintptr_t) 2415 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2416 #endif 2417 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2418 } 2419 2420 static void 2421 ifr_buffer_set_buffer_null(void *data) 2422 { 2423 union ifreq_union *ifrup; 2424 2425 ifrup = data; 2426 #ifdef COMPAT_FREEBSD32 2427 if (SV_CURPROC_FLAG(SV_ILP32)) 2428 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2429 else 2430 #endif 2431 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2432 } 2433 2434 static size_t 2435 ifr_buffer_get_length(void *data) 2436 { 2437 union ifreq_union *ifrup; 2438 2439 ifrup = data; 2440 #ifdef COMPAT_FREEBSD32 2441 if (SV_CURPROC_FLAG(SV_ILP32)) 2442 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2443 #endif 2444 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2445 } 2446 2447 static void 2448 ifr_buffer_set_length(void *data, size_t len) 2449 { 2450 union ifreq_union *ifrup; 2451 2452 ifrup = data; 2453 #ifdef COMPAT_FREEBSD32 2454 if (SV_CURPROC_FLAG(SV_ILP32)) 2455 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2456 else 2457 #endif 2458 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2459 } 2460 2461 void * 2462 ifr_data_get_ptr(void *ifrp) 2463 { 2464 union ifreq_union *ifrup; 2465 2466 ifrup = ifrp; 2467 #ifdef COMPAT_FREEBSD32 2468 if (SV_CURPROC_FLAG(SV_ILP32)) 2469 return ((void *)(uintptr_t) 2470 ifrup->ifr32.ifr_ifru.ifru_data); 2471 #endif 2472 return (ifrup->ifr.ifr_ifru.ifru_data); 2473 } 2474 2475 /* 2476 * Hardware specific interface ioctls. 2477 */ 2478 int 2479 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2480 { 2481 struct ifreq *ifr; 2482 int error = 0, do_ifup = 0; 2483 int new_flags, temp_flags; 2484 size_t namelen, onamelen; 2485 size_t descrlen; 2486 char *descrbuf, *odescrbuf; 2487 char new_name[IFNAMSIZ]; 2488 struct ifaddr *ifa; 2489 struct sockaddr_dl *sdl; 2490 2491 ifr = (struct ifreq *)data; 2492 switch (cmd) { 2493 case SIOCGIFINDEX: 2494 ifr->ifr_index = ifp->if_index; 2495 break; 2496 2497 case SIOCGIFFLAGS: 2498 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2499 ifr->ifr_flags = temp_flags & 0xffff; 2500 ifr->ifr_flagshigh = temp_flags >> 16; 2501 break; 2502 2503 case SIOCGIFCAP: 2504 ifr->ifr_reqcap = ifp->if_capabilities; 2505 ifr->ifr_curcap = ifp->if_capenable; 2506 break; 2507 2508 #ifdef MAC 2509 case SIOCGIFMAC: 2510 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2511 break; 2512 #endif 2513 2514 case SIOCGIFMETRIC: 2515 ifr->ifr_metric = ifp->if_metric; 2516 break; 2517 2518 case SIOCGIFMTU: 2519 ifr->ifr_mtu = ifp->if_mtu; 2520 break; 2521 2522 case SIOCGIFPHYS: 2523 /* XXXGL: did this ever worked? */ 2524 ifr->ifr_phys = 0; 2525 break; 2526 2527 case SIOCGIFDESCR: 2528 error = 0; 2529 sx_slock(&ifdescr_sx); 2530 if (ifp->if_description == NULL) 2531 error = ENOMSG; 2532 else { 2533 /* space for terminating nul */ 2534 descrlen = strlen(ifp->if_description) + 1; 2535 if (ifr_buffer_get_length(ifr) < descrlen) 2536 ifr_buffer_set_buffer_null(ifr); 2537 else 2538 error = copyout(ifp->if_description, 2539 ifr_buffer_get_buffer(ifr), descrlen); 2540 ifr_buffer_set_length(ifr, descrlen); 2541 } 2542 sx_sunlock(&ifdescr_sx); 2543 break; 2544 2545 case SIOCSIFDESCR: 2546 error = priv_check(td, PRIV_NET_SETIFDESCR); 2547 if (error) 2548 return (error); 2549 2550 /* 2551 * Copy only (length-1) bytes to make sure that 2552 * if_description is always nul terminated. The 2553 * length parameter is supposed to count the 2554 * terminating nul in. 2555 */ 2556 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2557 return (ENAMETOOLONG); 2558 else if (ifr_buffer_get_length(ifr) == 0) 2559 descrbuf = NULL; 2560 else { 2561 descrbuf = malloc(ifr_buffer_get_length(ifr), 2562 M_IFDESCR, M_WAITOK | M_ZERO); 2563 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2564 ifr_buffer_get_length(ifr) - 1); 2565 if (error) { 2566 free(descrbuf, M_IFDESCR); 2567 break; 2568 } 2569 } 2570 2571 sx_xlock(&ifdescr_sx); 2572 odescrbuf = ifp->if_description; 2573 ifp->if_description = descrbuf; 2574 sx_xunlock(&ifdescr_sx); 2575 2576 getmicrotime(&ifp->if_lastchange); 2577 free(odescrbuf, M_IFDESCR); 2578 break; 2579 2580 case SIOCGIFFIB: 2581 ifr->ifr_fib = ifp->if_fib; 2582 break; 2583 2584 case SIOCSIFFIB: 2585 error = priv_check(td, PRIV_NET_SETIFFIB); 2586 if (error) 2587 return (error); 2588 if (ifr->ifr_fib >= rt_numfibs) 2589 return (EINVAL); 2590 2591 ifp->if_fib = ifr->ifr_fib; 2592 break; 2593 2594 case SIOCSIFFLAGS: 2595 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2596 if (error) 2597 return (error); 2598 /* 2599 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2600 * check, so we don't need special handling here yet. 2601 */ 2602 new_flags = (ifr->ifr_flags & 0xffff) | 2603 (ifr->ifr_flagshigh << 16); 2604 if (ifp->if_flags & IFF_UP && 2605 (new_flags & IFF_UP) == 0) { 2606 if_down(ifp); 2607 } else if (new_flags & IFF_UP && 2608 (ifp->if_flags & IFF_UP) == 0) { 2609 do_ifup = 1; 2610 } 2611 /* See if permanently promiscuous mode bit is about to flip */ 2612 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2613 if (new_flags & IFF_PPROMISC) 2614 ifp->if_flags |= IFF_PROMISC; 2615 else if (ifp->if_pcount == 0) 2616 ifp->if_flags &= ~IFF_PROMISC; 2617 if (log_promisc_mode_change) 2618 if_printf(ifp, "permanently promiscuous mode %s\n", 2619 ((new_flags & IFF_PPROMISC) ? 2620 "enabled" : "disabled")); 2621 } 2622 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2623 (new_flags &~ IFF_CANTCHANGE); 2624 if (ifp->if_ioctl) { 2625 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2626 } 2627 if (do_ifup) 2628 if_up(ifp); 2629 getmicrotime(&ifp->if_lastchange); 2630 break; 2631 2632 case SIOCSIFCAP: 2633 error = priv_check(td, PRIV_NET_SETIFCAP); 2634 if (error) 2635 return (error); 2636 if (ifp->if_ioctl == NULL) 2637 return (EOPNOTSUPP); 2638 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2639 return (EINVAL); 2640 error = (*ifp->if_ioctl)(ifp, cmd, data); 2641 if (error == 0) 2642 getmicrotime(&ifp->if_lastchange); 2643 break; 2644 2645 #ifdef MAC 2646 case SIOCSIFMAC: 2647 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2648 break; 2649 #endif 2650 2651 case SIOCSIFNAME: 2652 error = priv_check(td, PRIV_NET_SETIFNAME); 2653 if (error) 2654 return (error); 2655 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2656 NULL); 2657 if (error != 0) 2658 return (error); 2659 if (new_name[0] == '\0') 2660 return (EINVAL); 2661 if (new_name[IFNAMSIZ-1] != '\0') { 2662 new_name[IFNAMSIZ-1] = '\0'; 2663 if (strlen(new_name) == IFNAMSIZ-1) 2664 return (EINVAL); 2665 } 2666 if (strcmp(new_name, ifp->if_xname) == 0) 2667 break; 2668 if (ifunit(new_name) != NULL) 2669 return (EEXIST); 2670 2671 /* 2672 * XXX: Locking. Nothing else seems to lock if_flags, 2673 * and there are numerous other races with the 2674 * ifunit() checks not being atomic with namespace 2675 * changes (renames, vmoves, if_attach, etc). 2676 */ 2677 ifp->if_flags |= IFF_RENAMING; 2678 2679 /* Announce the departure of the interface. */ 2680 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2681 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2682 2683 if_printf(ifp, "changing name to '%s'\n", new_name); 2684 2685 IF_ADDR_WLOCK(ifp); 2686 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2687 ifa = ifp->if_addr; 2688 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2689 namelen = strlen(new_name); 2690 onamelen = sdl->sdl_nlen; 2691 /* 2692 * Move the address if needed. This is safe because we 2693 * allocate space for a name of length IFNAMSIZ when we 2694 * create this in if_attach(). 2695 */ 2696 if (namelen != onamelen) { 2697 bcopy(sdl->sdl_data + onamelen, 2698 sdl->sdl_data + namelen, sdl->sdl_alen); 2699 } 2700 bcopy(new_name, sdl->sdl_data, namelen); 2701 sdl->sdl_nlen = namelen; 2702 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2703 bzero(sdl->sdl_data, onamelen); 2704 while (namelen != 0) 2705 sdl->sdl_data[--namelen] = 0xff; 2706 IF_ADDR_WUNLOCK(ifp); 2707 2708 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2709 /* Announce the return of the interface. */ 2710 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2711 2712 ifp->if_flags &= ~IFF_RENAMING; 2713 break; 2714 2715 #ifdef VIMAGE 2716 case SIOCSIFVNET: 2717 error = priv_check(td, PRIV_NET_SETIFVNET); 2718 if (error) 2719 return (error); 2720 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2721 break; 2722 #endif 2723 2724 case SIOCSIFMETRIC: 2725 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2726 if (error) 2727 return (error); 2728 ifp->if_metric = ifr->ifr_metric; 2729 getmicrotime(&ifp->if_lastchange); 2730 break; 2731 2732 case SIOCSIFPHYS: 2733 error = priv_check(td, PRIV_NET_SETIFPHYS); 2734 if (error) 2735 return (error); 2736 if (ifp->if_ioctl == NULL) 2737 return (EOPNOTSUPP); 2738 error = (*ifp->if_ioctl)(ifp, cmd, data); 2739 if (error == 0) 2740 getmicrotime(&ifp->if_lastchange); 2741 break; 2742 2743 case SIOCSIFMTU: 2744 { 2745 u_long oldmtu = ifp->if_mtu; 2746 2747 error = priv_check(td, PRIV_NET_SETIFMTU); 2748 if (error) 2749 return (error); 2750 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2751 return (EINVAL); 2752 if (ifp->if_ioctl == NULL) 2753 return (EOPNOTSUPP); 2754 error = (*ifp->if_ioctl)(ifp, cmd, data); 2755 if (error == 0) { 2756 getmicrotime(&ifp->if_lastchange); 2757 rt_ifmsg(ifp); 2758 #ifdef INET 2759 DEBUGNET_NOTIFY_MTU(ifp); 2760 #endif 2761 } 2762 /* 2763 * If the link MTU changed, do network layer specific procedure. 2764 */ 2765 if (ifp->if_mtu != oldmtu) { 2766 #ifdef INET6 2767 nd6_setmtu(ifp); 2768 #endif 2769 rt_updatemtu(ifp); 2770 } 2771 break; 2772 } 2773 2774 case SIOCADDMULTI: 2775 case SIOCDELMULTI: 2776 if (cmd == SIOCADDMULTI) 2777 error = priv_check(td, PRIV_NET_ADDMULTI); 2778 else 2779 error = priv_check(td, PRIV_NET_DELMULTI); 2780 if (error) 2781 return (error); 2782 2783 /* Don't allow group membership on non-multicast interfaces. */ 2784 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2785 return (EOPNOTSUPP); 2786 2787 /* Don't let users screw up protocols' entries. */ 2788 if (ifr->ifr_addr.sa_family != AF_LINK) 2789 return (EINVAL); 2790 2791 if (cmd == SIOCADDMULTI) { 2792 struct epoch_tracker et; 2793 struct ifmultiaddr *ifma; 2794 2795 /* 2796 * Userland is only permitted to join groups once 2797 * via the if_addmulti() KPI, because it cannot hold 2798 * struct ifmultiaddr * between calls. It may also 2799 * lose a race while we check if the membership 2800 * already exists. 2801 */ 2802 NET_EPOCH_ENTER(et); 2803 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2804 NET_EPOCH_EXIT(et); 2805 if (ifma != NULL) 2806 error = EADDRINUSE; 2807 else 2808 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2809 } else { 2810 error = if_delmulti(ifp, &ifr->ifr_addr); 2811 } 2812 if (error == 0) 2813 getmicrotime(&ifp->if_lastchange); 2814 break; 2815 2816 case SIOCSIFPHYADDR: 2817 case SIOCDIFPHYADDR: 2818 #ifdef INET6 2819 case SIOCSIFPHYADDR_IN6: 2820 #endif 2821 case SIOCSIFMEDIA: 2822 case SIOCSIFGENERIC: 2823 error = priv_check(td, PRIV_NET_HWIOCTL); 2824 if (error) 2825 return (error); 2826 if (ifp->if_ioctl == NULL) 2827 return (EOPNOTSUPP); 2828 error = (*ifp->if_ioctl)(ifp, cmd, data); 2829 if (error == 0) 2830 getmicrotime(&ifp->if_lastchange); 2831 break; 2832 2833 case SIOCGIFSTATUS: 2834 case SIOCGIFPSRCADDR: 2835 case SIOCGIFPDSTADDR: 2836 case SIOCGIFMEDIA: 2837 case SIOCGIFXMEDIA: 2838 case SIOCGIFGENERIC: 2839 case SIOCGIFRSSKEY: 2840 case SIOCGIFRSSHASH: 2841 case SIOCGIFDOWNREASON: 2842 if (ifp->if_ioctl == NULL) 2843 return (EOPNOTSUPP); 2844 error = (*ifp->if_ioctl)(ifp, cmd, data); 2845 break; 2846 2847 case SIOCSIFLLADDR: 2848 error = priv_check(td, PRIV_NET_SETLLADDR); 2849 if (error) 2850 return (error); 2851 error = if_setlladdr(ifp, 2852 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2853 break; 2854 2855 case SIOCGHWADDR: 2856 error = if_gethwaddr(ifp, ifr); 2857 break; 2858 2859 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2860 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2861 if (error) 2862 return (error); 2863 if ((error = if_addgroup(ifp, 2864 ifgr_group_get((struct ifgroupreq *)data)))) 2865 return (error); 2866 break; 2867 2868 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2869 { 2870 struct epoch_tracker et; 2871 2872 NET_EPOCH_ENTER(et); 2873 error = if_getgroup((struct ifgroupreq *)data, ifp); 2874 NET_EPOCH_EXIT(et); 2875 break; 2876 } 2877 2878 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2879 error = priv_check(td, PRIV_NET_DELIFGROUP); 2880 if (error) 2881 return (error); 2882 if ((error = if_delgroup(ifp, 2883 ifgr_group_get((struct ifgroupreq *)data)))) 2884 return (error); 2885 break; 2886 2887 default: 2888 error = ENOIOCTL; 2889 break; 2890 } 2891 return (error); 2892 } 2893 2894 #ifdef COMPAT_FREEBSD32 2895 struct ifconf32 { 2896 int32_t ifc_len; 2897 union { 2898 uint32_t ifcu_buf; 2899 uint32_t ifcu_req; 2900 } ifc_ifcu; 2901 }; 2902 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2903 #endif 2904 2905 #ifdef COMPAT_FREEBSD32 2906 static void 2907 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2908 { 2909 struct ifmediareq32 *ifmr32; 2910 2911 ifmr32 = (struct ifmediareq32 *)data; 2912 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2913 sizeof(ifmr->ifm_name)); 2914 ifmr->ifm_current = ifmr32->ifm_current; 2915 ifmr->ifm_mask = ifmr32->ifm_mask; 2916 ifmr->ifm_status = ifmr32->ifm_status; 2917 ifmr->ifm_active = ifmr32->ifm_active; 2918 ifmr->ifm_count = ifmr32->ifm_count; 2919 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2920 } 2921 2922 static void 2923 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2924 { 2925 struct ifmediareq32 *ifmr32; 2926 2927 ifmr32 = (struct ifmediareq32 *)data; 2928 ifmr32->ifm_current = ifmr->ifm_current; 2929 ifmr32->ifm_mask = ifmr->ifm_mask; 2930 ifmr32->ifm_status = ifmr->ifm_status; 2931 ifmr32->ifm_active = ifmr->ifm_active; 2932 ifmr32->ifm_count = ifmr->ifm_count; 2933 } 2934 #endif 2935 2936 /* 2937 * Interface ioctls. 2938 */ 2939 int 2940 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2941 { 2942 #ifdef COMPAT_FREEBSD32 2943 caddr_t saved_data = NULL; 2944 struct ifmediareq ifmr; 2945 struct ifmediareq *ifmrp = NULL; 2946 #endif 2947 struct ifnet *ifp; 2948 struct ifreq *ifr; 2949 int error; 2950 int oif_flags; 2951 2952 CURVNET_SET(so->so_vnet); 2953 #ifdef VIMAGE 2954 /* Make sure the VNET is stable. */ 2955 if (so->so_vnet->vnet_shutdown) { 2956 CURVNET_RESTORE(); 2957 return (EBUSY); 2958 } 2959 #endif 2960 2961 switch (cmd) { 2962 case SIOCGIFCONF: 2963 error = ifconf(cmd, data); 2964 goto out_noref; 2965 2966 #ifdef COMPAT_FREEBSD32 2967 case SIOCGIFCONF32: 2968 { 2969 struct ifconf32 *ifc32; 2970 struct ifconf ifc; 2971 2972 ifc32 = (struct ifconf32 *)data; 2973 ifc.ifc_len = ifc32->ifc_len; 2974 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2975 2976 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2977 if (error == 0) 2978 ifc32->ifc_len = ifc.ifc_len; 2979 goto out_noref; 2980 } 2981 #endif 2982 } 2983 2984 #ifdef COMPAT_FREEBSD32 2985 switch (cmd) { 2986 case SIOCGIFMEDIA32: 2987 case SIOCGIFXMEDIA32: 2988 ifmrp = &ifmr; 2989 ifmr_init(ifmrp, data); 2990 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 2991 saved_data = data; 2992 data = (caddr_t)ifmrp; 2993 } 2994 #endif 2995 2996 ifr = (struct ifreq *)data; 2997 switch (cmd) { 2998 #ifdef VIMAGE 2999 case SIOCSIFRVNET: 3000 error = priv_check(td, PRIV_NET_SETIFVNET); 3001 if (error == 0) 3002 error = if_vmove_reclaim(td, ifr->ifr_name, 3003 ifr->ifr_jid); 3004 goto out_noref; 3005 #endif 3006 case SIOCIFCREATE: 3007 case SIOCIFCREATE2: 3008 error = priv_check(td, PRIV_NET_IFCREATE); 3009 if (error == 0) 3010 error = if_clone_create(ifr->ifr_name, 3011 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3012 ifr_data_get_ptr(ifr) : NULL); 3013 goto out_noref; 3014 case SIOCIFDESTROY: 3015 error = priv_check(td, PRIV_NET_IFDESTROY); 3016 if (error == 0) 3017 error = if_clone_destroy(ifr->ifr_name); 3018 goto out_noref; 3019 3020 case SIOCIFGCLONERS: 3021 error = if_clone_list((struct if_clonereq *)data); 3022 goto out_noref; 3023 3024 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3025 error = if_getgroupmembers((struct ifgroupreq *)data); 3026 goto out_noref; 3027 3028 #if defined(INET) || defined(INET6) 3029 case SIOCSVH: 3030 case SIOCGVH: 3031 if (carp_ioctl_p == NULL) 3032 error = EPROTONOSUPPORT; 3033 else 3034 error = (*carp_ioctl_p)(ifr, cmd, td); 3035 goto out_noref; 3036 #endif 3037 } 3038 3039 ifp = ifunit_ref(ifr->ifr_name); 3040 if (ifp == NULL) { 3041 error = ENXIO; 3042 goto out_noref; 3043 } 3044 3045 error = ifhwioctl(cmd, ifp, data, td); 3046 if (error != ENOIOCTL) 3047 goto out_ref; 3048 3049 oif_flags = ifp->if_flags; 3050 if (so->so_proto == NULL) { 3051 error = EOPNOTSUPP; 3052 goto out_ref; 3053 } 3054 3055 /* 3056 * Pass the request on to the socket control method, and if the 3057 * latter returns EOPNOTSUPP, directly to the interface. 3058 * 3059 * Make an exception for the legacy SIOCSIF* requests. Drivers 3060 * trust SIOCSIFADDR et al to come from an already privileged 3061 * layer, and do not perform any credentials checks or input 3062 * validation. 3063 */ 3064 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3065 ifp, td)); 3066 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3067 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3068 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3069 error = (*ifp->if_ioctl)(ifp, cmd, data); 3070 3071 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3072 #ifdef INET6 3073 if (ifp->if_flags & IFF_UP) 3074 in6_if_up(ifp); 3075 #endif 3076 } 3077 3078 out_ref: 3079 if_rele(ifp); 3080 out_noref: 3081 #ifdef COMPAT_FREEBSD32 3082 if (ifmrp != NULL) { 3083 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3084 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3085 cmd)); 3086 data = saved_data; 3087 ifmr_update(ifmrp, data); 3088 } 3089 #endif 3090 CURVNET_RESTORE(); 3091 return (error); 3092 } 3093 3094 /* 3095 * The code common to handling reference counted flags, 3096 * e.g., in ifpromisc() and if_allmulti(). 3097 * The "pflag" argument can specify a permanent mode flag to check, 3098 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3099 * 3100 * Only to be used on stack-owned flags, not driver-owned flags. 3101 */ 3102 static int 3103 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3104 { 3105 struct ifreq ifr; 3106 int error; 3107 int oldflags, oldcount; 3108 3109 /* Sanity checks to catch programming errors */ 3110 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3111 ("%s: setting driver-owned flag %d", __func__, flag)); 3112 3113 if (onswitch) 3114 KASSERT(*refcount >= 0, 3115 ("%s: increment negative refcount %d for flag %d", 3116 __func__, *refcount, flag)); 3117 else 3118 KASSERT(*refcount > 0, 3119 ("%s: decrement non-positive refcount %d for flag %d", 3120 __func__, *refcount, flag)); 3121 3122 /* In case this mode is permanent, just touch refcount */ 3123 if (ifp->if_flags & pflag) { 3124 *refcount += onswitch ? 1 : -1; 3125 return (0); 3126 } 3127 3128 /* Save ifnet parameters for if_ioctl() may fail */ 3129 oldcount = *refcount; 3130 oldflags = ifp->if_flags; 3131 3132 /* 3133 * See if we aren't the only and touching refcount is enough. 3134 * Actually toggle interface flag if we are the first or last. 3135 */ 3136 if (onswitch) { 3137 if ((*refcount)++) 3138 return (0); 3139 ifp->if_flags |= flag; 3140 } else { 3141 if (--(*refcount)) 3142 return (0); 3143 ifp->if_flags &= ~flag; 3144 } 3145 3146 /* Call down the driver since we've changed interface flags */ 3147 if (ifp->if_ioctl == NULL) { 3148 error = EOPNOTSUPP; 3149 goto recover; 3150 } 3151 ifr.ifr_flags = ifp->if_flags & 0xffff; 3152 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3153 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3154 if (error) 3155 goto recover; 3156 /* Notify userland that interface flags have changed */ 3157 rt_ifmsg(ifp); 3158 return (0); 3159 3160 recover: 3161 /* Recover after driver error */ 3162 *refcount = oldcount; 3163 ifp->if_flags = oldflags; 3164 return (error); 3165 } 3166 3167 /* 3168 * Set/clear promiscuous mode on interface ifp based on the truth value 3169 * of pswitch. The calls are reference counted so that only the first 3170 * "on" request actually has an effect, as does the final "off" request. 3171 * Results are undefined if the "off" and "on" requests are not matched. 3172 */ 3173 int 3174 ifpromisc(struct ifnet *ifp, int pswitch) 3175 { 3176 int error; 3177 int oldflags = ifp->if_flags; 3178 3179 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3180 &ifp->if_pcount, pswitch); 3181 /* If promiscuous mode status has changed, log a message */ 3182 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3183 log_promisc_mode_change) 3184 if_printf(ifp, "promiscuous mode %s\n", 3185 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3186 return (error); 3187 } 3188 3189 /* 3190 * Return interface configuration 3191 * of system. List may be used 3192 * in later ioctl's (above) to get 3193 * other information. 3194 */ 3195 /*ARGSUSED*/ 3196 static int 3197 ifconf(u_long cmd, caddr_t data) 3198 { 3199 struct ifconf *ifc = (struct ifconf *)data; 3200 struct ifnet *ifp; 3201 struct ifaddr *ifa; 3202 struct ifreq ifr; 3203 struct sbuf *sb; 3204 int error, full = 0, valid_len, max_len; 3205 3206 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3207 max_len = MAXPHYS - 1; 3208 3209 /* Prevent hostile input from being able to crash the system */ 3210 if (ifc->ifc_len <= 0) 3211 return (EINVAL); 3212 3213 again: 3214 if (ifc->ifc_len <= max_len) { 3215 max_len = ifc->ifc_len; 3216 full = 1; 3217 } 3218 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3219 max_len = 0; 3220 valid_len = 0; 3221 3222 IFNET_RLOCK(); 3223 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3224 struct epoch_tracker et; 3225 int addrs; 3226 3227 /* 3228 * Zero the ifr to make sure we don't disclose the contents 3229 * of the stack. 3230 */ 3231 memset(&ifr, 0, sizeof(ifr)); 3232 3233 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3234 >= sizeof(ifr.ifr_name)) { 3235 sbuf_delete(sb); 3236 IFNET_RUNLOCK(); 3237 return (ENAMETOOLONG); 3238 } 3239 3240 addrs = 0; 3241 NET_EPOCH_ENTER(et); 3242 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3243 struct sockaddr *sa = ifa->ifa_addr; 3244 3245 if (prison_if(curthread->td_ucred, sa) != 0) 3246 continue; 3247 addrs++; 3248 if (sa->sa_len <= sizeof(*sa)) { 3249 if (sa->sa_len < sizeof(*sa)) { 3250 memset(&ifr.ifr_ifru.ifru_addr, 0, 3251 sizeof(ifr.ifr_ifru.ifru_addr)); 3252 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3253 sa->sa_len); 3254 } else 3255 ifr.ifr_ifru.ifru_addr = *sa; 3256 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3257 max_len += sizeof(ifr); 3258 } else { 3259 sbuf_bcat(sb, &ifr, 3260 offsetof(struct ifreq, ifr_addr)); 3261 max_len += offsetof(struct ifreq, ifr_addr); 3262 sbuf_bcat(sb, sa, sa->sa_len); 3263 max_len += sa->sa_len; 3264 } 3265 3266 if (sbuf_error(sb) == 0) 3267 valid_len = sbuf_len(sb); 3268 } 3269 NET_EPOCH_EXIT(et); 3270 if (addrs == 0) { 3271 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3272 max_len += sizeof(ifr); 3273 3274 if (sbuf_error(sb) == 0) 3275 valid_len = sbuf_len(sb); 3276 } 3277 } 3278 IFNET_RUNLOCK(); 3279 3280 /* 3281 * If we didn't allocate enough space (uncommon), try again. If 3282 * we have already allocated as much space as we are allowed, 3283 * return what we've got. 3284 */ 3285 if (valid_len != max_len && !full) { 3286 sbuf_delete(sb); 3287 goto again; 3288 } 3289 3290 ifc->ifc_len = valid_len; 3291 sbuf_finish(sb); 3292 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3293 sbuf_delete(sb); 3294 return (error); 3295 } 3296 3297 /* 3298 * Just like ifpromisc(), but for all-multicast-reception mode. 3299 */ 3300 int 3301 if_allmulti(struct ifnet *ifp, int onswitch) 3302 { 3303 3304 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3305 } 3306 3307 struct ifmultiaddr * 3308 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3309 { 3310 struct ifmultiaddr *ifma; 3311 3312 IF_ADDR_LOCK_ASSERT(ifp); 3313 3314 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3315 if (sa->sa_family == AF_LINK) { 3316 if (sa_dl_equal(ifma->ifma_addr, sa)) 3317 break; 3318 } else { 3319 if (sa_equal(ifma->ifma_addr, sa)) 3320 break; 3321 } 3322 } 3323 3324 return ifma; 3325 } 3326 3327 /* 3328 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3329 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3330 * the ifnet multicast address list here, so the caller must do that and 3331 * other setup work (such as notifying the device driver). The reference 3332 * count is initialized to 1. 3333 */ 3334 static struct ifmultiaddr * 3335 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3336 int mflags) 3337 { 3338 struct ifmultiaddr *ifma; 3339 struct sockaddr *dupsa; 3340 3341 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3342 M_ZERO); 3343 if (ifma == NULL) 3344 return (NULL); 3345 3346 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3347 if (dupsa == NULL) { 3348 free(ifma, M_IFMADDR); 3349 return (NULL); 3350 } 3351 bcopy(sa, dupsa, sa->sa_len); 3352 ifma->ifma_addr = dupsa; 3353 3354 ifma->ifma_ifp = ifp; 3355 ifma->ifma_refcount = 1; 3356 ifma->ifma_protospec = NULL; 3357 3358 if (llsa == NULL) { 3359 ifma->ifma_lladdr = NULL; 3360 return (ifma); 3361 } 3362 3363 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3364 if (dupsa == NULL) { 3365 free(ifma->ifma_addr, M_IFMADDR); 3366 free(ifma, M_IFMADDR); 3367 return (NULL); 3368 } 3369 bcopy(llsa, dupsa, llsa->sa_len); 3370 ifma->ifma_lladdr = dupsa; 3371 3372 return (ifma); 3373 } 3374 3375 /* 3376 * if_freemulti: free ifmultiaddr structure and possibly attached related 3377 * addresses. The caller is responsible for implementing reference 3378 * counting, notifying the driver, handling routing messages, and releasing 3379 * any dependent link layer state. 3380 */ 3381 #ifdef MCAST_VERBOSE 3382 extern void kdb_backtrace(void); 3383 #endif 3384 static void 3385 if_freemulti_internal(struct ifmultiaddr *ifma) 3386 { 3387 3388 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3389 ifma->ifma_refcount)); 3390 3391 if (ifma->ifma_lladdr != NULL) 3392 free(ifma->ifma_lladdr, M_IFMADDR); 3393 #ifdef MCAST_VERBOSE 3394 kdb_backtrace(); 3395 printf("%s freeing ifma: %p\n", __func__, ifma); 3396 #endif 3397 free(ifma->ifma_addr, M_IFMADDR); 3398 free(ifma, M_IFMADDR); 3399 } 3400 3401 static void 3402 if_destroymulti(epoch_context_t ctx) 3403 { 3404 struct ifmultiaddr *ifma; 3405 3406 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3407 if_freemulti_internal(ifma); 3408 } 3409 3410 void 3411 if_freemulti(struct ifmultiaddr *ifma) 3412 { 3413 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3414 ifma->ifma_refcount)); 3415 3416 NET_EPOCH_CALL(if_destroymulti, &ifma->ifma_epoch_ctx); 3417 } 3418 3419 3420 /* 3421 * Register an additional multicast address with a network interface. 3422 * 3423 * - If the address is already present, bump the reference count on the 3424 * address and return. 3425 * - If the address is not link-layer, look up a link layer address. 3426 * - Allocate address structures for one or both addresses, and attach to the 3427 * multicast address list on the interface. If automatically adding a link 3428 * layer address, the protocol address will own a reference to the link 3429 * layer address, to be freed when it is freed. 3430 * - Notify the network device driver of an addition to the multicast address 3431 * list. 3432 * 3433 * 'sa' points to caller-owned memory with the desired multicast address. 3434 * 3435 * 'retifma' will be used to return a pointer to the resulting multicast 3436 * address reference, if desired. 3437 */ 3438 int 3439 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3440 struct ifmultiaddr **retifma) 3441 { 3442 struct ifmultiaddr *ifma, *ll_ifma; 3443 struct sockaddr *llsa; 3444 struct sockaddr_dl sdl; 3445 int error; 3446 3447 #ifdef INET 3448 IN_MULTI_LIST_UNLOCK_ASSERT(); 3449 #endif 3450 #ifdef INET6 3451 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3452 #endif 3453 /* 3454 * If the address is already present, return a new reference to it; 3455 * otherwise, allocate storage and set up a new address. 3456 */ 3457 IF_ADDR_WLOCK(ifp); 3458 ifma = if_findmulti(ifp, sa); 3459 if (ifma != NULL) { 3460 ifma->ifma_refcount++; 3461 if (retifma != NULL) 3462 *retifma = ifma; 3463 IF_ADDR_WUNLOCK(ifp); 3464 return (0); 3465 } 3466 3467 /* 3468 * The address isn't already present; resolve the protocol address 3469 * into a link layer address, and then look that up, bump its 3470 * refcount or allocate an ifma for that also. 3471 * Most link layer resolving functions returns address data which 3472 * fits inside default sockaddr_dl structure. However callback 3473 * can allocate another sockaddr structure, in that case we need to 3474 * free it later. 3475 */ 3476 llsa = NULL; 3477 ll_ifma = NULL; 3478 if (ifp->if_resolvemulti != NULL) { 3479 /* Provide called function with buffer size information */ 3480 sdl.sdl_len = sizeof(sdl); 3481 llsa = (struct sockaddr *)&sdl; 3482 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3483 if (error) 3484 goto unlock_out; 3485 } 3486 3487 /* 3488 * Allocate the new address. Don't hook it up yet, as we may also 3489 * need to allocate a link layer multicast address. 3490 */ 3491 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3492 if (ifma == NULL) { 3493 error = ENOMEM; 3494 goto free_llsa_out; 3495 } 3496 3497 /* 3498 * If a link layer address is found, we'll need to see if it's 3499 * already present in the address list, or allocate is as well. 3500 * When this block finishes, the link layer address will be on the 3501 * list. 3502 */ 3503 if (llsa != NULL) { 3504 ll_ifma = if_findmulti(ifp, llsa); 3505 if (ll_ifma == NULL) { 3506 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3507 if (ll_ifma == NULL) { 3508 --ifma->ifma_refcount; 3509 if_freemulti(ifma); 3510 error = ENOMEM; 3511 goto free_llsa_out; 3512 } 3513 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3514 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3515 ifma_link); 3516 } else 3517 ll_ifma->ifma_refcount++; 3518 ifma->ifma_llifma = ll_ifma; 3519 } 3520 3521 /* 3522 * We now have a new multicast address, ifma, and possibly a new or 3523 * referenced link layer address. Add the primary address to the 3524 * ifnet address list. 3525 */ 3526 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3527 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3528 3529 if (retifma != NULL) 3530 *retifma = ifma; 3531 3532 /* 3533 * Must generate the message while holding the lock so that 'ifma' 3534 * pointer is still valid. 3535 */ 3536 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3537 IF_ADDR_WUNLOCK(ifp); 3538 3539 /* 3540 * We are certain we have added something, so call down to the 3541 * interface to let them know about it. 3542 */ 3543 if (ifp->if_ioctl != NULL) { 3544 if (THREAD_CAN_SLEEP()) 3545 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3546 else 3547 taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask); 3548 } 3549 3550 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3551 link_free_sdl(llsa); 3552 3553 return (0); 3554 3555 free_llsa_out: 3556 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3557 link_free_sdl(llsa); 3558 3559 unlock_out: 3560 IF_ADDR_WUNLOCK(ifp); 3561 return (error); 3562 } 3563 3564 static void 3565 if_siocaddmulti(void *arg, int pending) 3566 { 3567 struct ifnet *ifp; 3568 3569 ifp = arg; 3570 #ifdef DIAGNOSTIC 3571 if (pending > 1) 3572 if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending); 3573 #endif 3574 CURVNET_SET(ifp->if_vnet); 3575 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3576 CURVNET_RESTORE(); 3577 } 3578 3579 /* 3580 * Delete a multicast group membership by network-layer group address. 3581 * 3582 * Returns ENOENT if the entry could not be found. If ifp no longer 3583 * exists, results are undefined. This entry point should only be used 3584 * from subsystems which do appropriate locking to hold ifp for the 3585 * duration of the call. 3586 * Network-layer protocol domains must use if_delmulti_ifma(). 3587 */ 3588 int 3589 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3590 { 3591 struct ifmultiaddr *ifma; 3592 int lastref; 3593 3594 KASSERT(ifp, ("%s: NULL ifp", __func__)); 3595 3596 IF_ADDR_WLOCK(ifp); 3597 lastref = 0; 3598 ifma = if_findmulti(ifp, sa); 3599 if (ifma != NULL) 3600 lastref = if_delmulti_locked(ifp, ifma, 0); 3601 IF_ADDR_WUNLOCK(ifp); 3602 3603 if (ifma == NULL) 3604 return (ENOENT); 3605 3606 if (lastref && ifp->if_ioctl != NULL) { 3607 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3608 } 3609 3610 return (0); 3611 } 3612 3613 /* 3614 * Delete all multicast group membership for an interface. 3615 * Should be used to quickly flush all multicast filters. 3616 */ 3617 void 3618 if_delallmulti(struct ifnet *ifp) 3619 { 3620 struct ifmultiaddr *ifma; 3621 struct ifmultiaddr *next; 3622 3623 IF_ADDR_WLOCK(ifp); 3624 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3625 if_delmulti_locked(ifp, ifma, 0); 3626 IF_ADDR_WUNLOCK(ifp); 3627 } 3628 3629 void 3630 if_delmulti_ifma(struct ifmultiaddr *ifma) 3631 { 3632 if_delmulti_ifma_flags(ifma, 0); 3633 } 3634 3635 /* 3636 * Delete a multicast group membership by group membership pointer. 3637 * Network-layer protocol domains must use this routine. 3638 * 3639 * It is safe to call this routine if the ifp disappeared. 3640 */ 3641 void 3642 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3643 { 3644 struct ifnet *ifp; 3645 int lastref; 3646 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3647 #ifdef INET 3648 IN_MULTI_LIST_UNLOCK_ASSERT(); 3649 #endif 3650 ifp = ifma->ifma_ifp; 3651 #ifdef DIAGNOSTIC 3652 if (ifp == NULL) { 3653 printf("%s: ifma_ifp seems to be detached\n", __func__); 3654 } else { 3655 struct epoch_tracker et; 3656 struct ifnet *oifp; 3657 3658 NET_EPOCH_ENTER(et); 3659 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3660 if (ifp == oifp) 3661 break; 3662 NET_EPOCH_EXIT(et); 3663 if (ifp != oifp) 3664 ifp = NULL; 3665 } 3666 #endif 3667 /* 3668 * If and only if the ifnet instance exists: Acquire the address lock. 3669 */ 3670 if (ifp != NULL) 3671 IF_ADDR_WLOCK(ifp); 3672 3673 lastref = if_delmulti_locked(ifp, ifma, flags); 3674 3675 if (ifp != NULL) { 3676 /* 3677 * If and only if the ifnet instance exists: 3678 * Release the address lock. 3679 * If the group was left: update the hardware hash filter. 3680 */ 3681 IF_ADDR_WUNLOCK(ifp); 3682 if (lastref && ifp->if_ioctl != NULL) { 3683 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3684 } 3685 } 3686 } 3687 3688 /* 3689 * Perform deletion of network-layer and/or link-layer multicast address. 3690 * 3691 * Return 0 if the reference count was decremented. 3692 * Return 1 if the final reference was released, indicating that the 3693 * hardware hash filter should be reprogrammed. 3694 */ 3695 static int 3696 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3697 { 3698 struct ifmultiaddr *ll_ifma; 3699 3700 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3701 KASSERT(ifma->ifma_ifp == ifp, 3702 ("%s: inconsistent ifp %p", __func__, ifp)); 3703 IF_ADDR_WLOCK_ASSERT(ifp); 3704 } 3705 3706 ifp = ifma->ifma_ifp; 3707 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3708 3709 /* 3710 * If the ifnet is detaching, null out references to ifnet, 3711 * so that upper protocol layers will notice, and not attempt 3712 * to obtain locks for an ifnet which no longer exists. The 3713 * routing socket announcement must happen before the ifnet 3714 * instance is detached from the system. 3715 */ 3716 if (detaching) { 3717 #ifdef DIAGNOSTIC 3718 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3719 #endif 3720 /* 3721 * ifp may already be nulled out if we are being reentered 3722 * to delete the ll_ifma. 3723 */ 3724 if (ifp != NULL) { 3725 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3726 ifma->ifma_ifp = NULL; 3727 } 3728 } 3729 3730 if (--ifma->ifma_refcount > 0) 3731 return 0; 3732 3733 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3734 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3735 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3736 } 3737 /* 3738 * If this ifma is a network-layer ifma, a link-layer ifma may 3739 * have been associated with it. Release it first if so. 3740 */ 3741 ll_ifma = ifma->ifma_llifma; 3742 if (ll_ifma != NULL) { 3743 KASSERT(ifma->ifma_lladdr != NULL, 3744 ("%s: llifma w/o lladdr", __func__)); 3745 if (detaching) 3746 ll_ifma->ifma_ifp = NULL; /* XXX */ 3747 if (--ll_ifma->ifma_refcount == 0) { 3748 if (ifp != NULL) { 3749 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3750 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3751 ifma_link); 3752 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3753 } 3754 } 3755 if_freemulti(ll_ifma); 3756 } 3757 } 3758 #ifdef INVARIANTS 3759 if (ifp) { 3760 struct ifmultiaddr *ifmatmp; 3761 3762 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3763 MPASS(ifma != ifmatmp); 3764 } 3765 #endif 3766 if_freemulti(ifma); 3767 /* 3768 * The last reference to this instance of struct ifmultiaddr 3769 * was released; the hardware should be notified of this change. 3770 */ 3771 return 1; 3772 } 3773 3774 /* 3775 * Set the link layer address on an interface. 3776 * 3777 * At this time we only support certain types of interfaces, 3778 * and we don't allow the length of the address to change. 3779 * 3780 * Set noinline to be dtrace-friendly 3781 */ 3782 __noinline int 3783 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3784 { 3785 struct sockaddr_dl *sdl; 3786 struct ifaddr *ifa; 3787 struct ifreq ifr; 3788 3789 ifa = ifp->if_addr; 3790 if (ifa == NULL) 3791 return (EINVAL); 3792 3793 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3794 if (sdl == NULL) 3795 return (EINVAL); 3796 3797 if (len != sdl->sdl_alen) /* don't allow length to change */ 3798 return (EINVAL); 3799 3800 switch (ifp->if_type) { 3801 case IFT_ETHER: 3802 case IFT_XETHER: 3803 case IFT_L2VLAN: 3804 case IFT_BRIDGE: 3805 case IFT_IEEE8023ADLAG: 3806 bcopy(lladdr, LLADDR(sdl), len); 3807 break; 3808 default: 3809 return (ENODEV); 3810 } 3811 3812 /* 3813 * If the interface is already up, we need 3814 * to re-init it in order to reprogram its 3815 * address filter. 3816 */ 3817 if ((ifp->if_flags & IFF_UP) != 0) { 3818 if (ifp->if_ioctl) { 3819 ifp->if_flags &= ~IFF_UP; 3820 ifr.ifr_flags = ifp->if_flags & 0xffff; 3821 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3822 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3823 ifp->if_flags |= IFF_UP; 3824 ifr.ifr_flags = ifp->if_flags & 0xffff; 3825 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3826 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3827 } 3828 } 3829 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3830 3831 return (0); 3832 } 3833 3834 /* 3835 * Compat function for handling basic encapsulation requests. 3836 * Not converted stacks (FDDI, IB, ..) supports traditional 3837 * output model: ARP (and other similar L2 protocols) are handled 3838 * inside output routine, arpresolve/nd6_resolve() returns MAC 3839 * address instead of full prepend. 3840 * 3841 * This function creates calculated header==MAC for IPv4/IPv6 and 3842 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3843 * address families. 3844 */ 3845 static int 3846 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3847 { 3848 3849 if (req->rtype != IFENCAP_LL) 3850 return (EOPNOTSUPP); 3851 3852 if (req->bufsize < req->lladdr_len) 3853 return (ENOMEM); 3854 3855 switch (req->family) { 3856 case AF_INET: 3857 case AF_INET6: 3858 break; 3859 default: 3860 return (EAFNOSUPPORT); 3861 } 3862 3863 /* Copy lladdr to storage as is */ 3864 memmove(req->buf, req->lladdr, req->lladdr_len); 3865 req->bufsize = req->lladdr_len; 3866 req->lladdr_off = 0; 3867 3868 return (0); 3869 } 3870 3871 /* 3872 * Tunnel interfaces can nest, also they may cause infinite recursion 3873 * calls when misconfigured. We'll prevent this by detecting loops. 3874 * High nesting level may cause stack exhaustion. We'll prevent this 3875 * by introducing upper limit. 3876 * 3877 * Return 0, if tunnel nesting count is equal or less than limit. 3878 */ 3879 int 3880 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3881 int limit) 3882 { 3883 struct m_tag *mtag; 3884 int count; 3885 3886 count = 1; 3887 mtag = NULL; 3888 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3889 if (*(struct ifnet **)(mtag + 1) == ifp) { 3890 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3891 return (EIO); 3892 } 3893 count++; 3894 } 3895 if (count > limit) { 3896 log(LOG_NOTICE, 3897 "%s: if_output recursively called too many times(%d)\n", 3898 if_name(ifp), count); 3899 return (EIO); 3900 } 3901 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3902 if (mtag == NULL) 3903 return (ENOMEM); 3904 *(struct ifnet **)(mtag + 1) = ifp; 3905 m_tag_prepend(m, mtag); 3906 return (0); 3907 } 3908 3909 /* 3910 * Get the link layer address that was read from the hardware at attach. 3911 * 3912 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3913 * their component interfaces as IFT_IEEE8023ADLAG. 3914 */ 3915 int 3916 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3917 { 3918 3919 if (ifp->if_hw_addr == NULL) 3920 return (ENODEV); 3921 3922 switch (ifp->if_type) { 3923 case IFT_ETHER: 3924 case IFT_IEEE8023ADLAG: 3925 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3926 return (0); 3927 default: 3928 return (ENODEV); 3929 } 3930 } 3931 3932 /* 3933 * The name argument must be a pointer to storage which will last as 3934 * long as the interface does. For physical devices, the result of 3935 * device_get_name(dev) is a good choice and for pseudo-devices a 3936 * static string works well. 3937 */ 3938 void 3939 if_initname(struct ifnet *ifp, const char *name, int unit) 3940 { 3941 ifp->if_dname = name; 3942 ifp->if_dunit = unit; 3943 if (unit != IF_DUNIT_NONE) 3944 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3945 else 3946 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3947 } 3948 3949 int 3950 if_printf(struct ifnet *ifp, const char *fmt, ...) 3951 { 3952 char if_fmt[256]; 3953 va_list ap; 3954 3955 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3956 va_start(ap, fmt); 3957 vlog(LOG_INFO, if_fmt, ap); 3958 va_end(ap); 3959 return (0); 3960 } 3961 3962 void 3963 if_start(struct ifnet *ifp) 3964 { 3965 3966 (*(ifp)->if_start)(ifp); 3967 } 3968 3969 /* 3970 * Backwards compatibility interface for drivers 3971 * that have not implemented it 3972 */ 3973 static int 3974 if_transmit(struct ifnet *ifp, struct mbuf *m) 3975 { 3976 int error; 3977 3978 IFQ_HANDOFF(ifp, m, error); 3979 return (error); 3980 } 3981 3982 static void 3983 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 3984 { 3985 3986 m_freem(m); 3987 } 3988 3989 int 3990 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3991 { 3992 int active = 0; 3993 3994 IF_LOCK(ifq); 3995 if (_IF_QFULL(ifq)) { 3996 IF_UNLOCK(ifq); 3997 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 3998 m_freem(m); 3999 return (0); 4000 } 4001 if (ifp != NULL) { 4002 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4003 if (m->m_flags & (M_BCAST|M_MCAST)) 4004 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4005 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4006 } 4007 _IF_ENQUEUE(ifq, m); 4008 IF_UNLOCK(ifq); 4009 if (ifp != NULL && !active) 4010 (*(ifp)->if_start)(ifp); 4011 return (1); 4012 } 4013 4014 void 4015 if_register_com_alloc(u_char type, 4016 if_com_alloc_t *a, if_com_free_t *f) 4017 { 4018 4019 KASSERT(if_com_alloc[type] == NULL, 4020 ("if_register_com_alloc: %d already registered", type)); 4021 KASSERT(if_com_free[type] == NULL, 4022 ("if_register_com_alloc: %d free already registered", type)); 4023 4024 if_com_alloc[type] = a; 4025 if_com_free[type] = f; 4026 } 4027 4028 void 4029 if_deregister_com_alloc(u_char type) 4030 { 4031 4032 KASSERT(if_com_alloc[type] != NULL, 4033 ("if_deregister_com_alloc: %d not registered", type)); 4034 KASSERT(if_com_free[type] != NULL, 4035 ("if_deregister_com_alloc: %d free not registered", type)); 4036 if_com_alloc[type] = NULL; 4037 if_com_free[type] = NULL; 4038 } 4039 4040 /* API for driver access to network stack owned ifnet.*/ 4041 uint64_t 4042 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4043 { 4044 uint64_t oldbrate; 4045 4046 oldbrate = ifp->if_baudrate; 4047 ifp->if_baudrate = baudrate; 4048 return (oldbrate); 4049 } 4050 4051 uint64_t 4052 if_getbaudrate(if_t ifp) 4053 { 4054 4055 return (((struct ifnet *)ifp)->if_baudrate); 4056 } 4057 4058 int 4059 if_setcapabilities(if_t ifp, int capabilities) 4060 { 4061 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4062 return (0); 4063 } 4064 4065 int 4066 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4067 { 4068 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4069 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4070 4071 return (0); 4072 } 4073 4074 int 4075 if_getcapabilities(if_t ifp) 4076 { 4077 return ((struct ifnet *)ifp)->if_capabilities; 4078 } 4079 4080 int 4081 if_setcapenable(if_t ifp, int capabilities) 4082 { 4083 ((struct ifnet *)ifp)->if_capenable = capabilities; 4084 return (0); 4085 } 4086 4087 int 4088 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4089 { 4090 if(setcap) 4091 ((struct ifnet *)ifp)->if_capenable |= setcap; 4092 if(clearcap) 4093 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4094 4095 return (0); 4096 } 4097 4098 const char * 4099 if_getdname(if_t ifp) 4100 { 4101 return ((struct ifnet *)ifp)->if_dname; 4102 } 4103 4104 int 4105 if_togglecapenable(if_t ifp, int togglecap) 4106 { 4107 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4108 return (0); 4109 } 4110 4111 int 4112 if_getcapenable(if_t ifp) 4113 { 4114 return ((struct ifnet *)ifp)->if_capenable; 4115 } 4116 4117 /* 4118 * This is largely undesirable because it ties ifnet to a device, but does 4119 * provide flexiblity for an embedded product vendor. Should be used with 4120 * the understanding that it violates the interface boundaries, and should be 4121 * a last resort only. 4122 */ 4123 int 4124 if_setdev(if_t ifp, void *dev) 4125 { 4126 return (0); 4127 } 4128 4129 int 4130 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4131 { 4132 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4133 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4134 4135 return (0); 4136 } 4137 4138 int 4139 if_getdrvflags(if_t ifp) 4140 { 4141 return ((struct ifnet *)ifp)->if_drv_flags; 4142 } 4143 4144 int 4145 if_setdrvflags(if_t ifp, int flags) 4146 { 4147 ((struct ifnet *)ifp)->if_drv_flags = flags; 4148 return (0); 4149 } 4150 4151 4152 int 4153 if_setflags(if_t ifp, int flags) 4154 { 4155 ((struct ifnet *)ifp)->if_flags = flags; 4156 return (0); 4157 } 4158 4159 int 4160 if_setflagbits(if_t ifp, int set, int clear) 4161 { 4162 ((struct ifnet *)ifp)->if_flags |= set; 4163 ((struct ifnet *)ifp)->if_flags &= ~clear; 4164 4165 return (0); 4166 } 4167 4168 int 4169 if_getflags(if_t ifp) 4170 { 4171 return ((struct ifnet *)ifp)->if_flags; 4172 } 4173 4174 int 4175 if_clearhwassist(if_t ifp) 4176 { 4177 ((struct ifnet *)ifp)->if_hwassist = 0; 4178 return (0); 4179 } 4180 4181 int 4182 if_sethwassistbits(if_t ifp, int toset, int toclear) 4183 { 4184 ((struct ifnet *)ifp)->if_hwassist |= toset; 4185 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4186 4187 return (0); 4188 } 4189 4190 int 4191 if_sethwassist(if_t ifp, int hwassist_bit) 4192 { 4193 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4194 return (0); 4195 } 4196 4197 int 4198 if_gethwassist(if_t ifp) 4199 { 4200 return ((struct ifnet *)ifp)->if_hwassist; 4201 } 4202 4203 int 4204 if_setmtu(if_t ifp, int mtu) 4205 { 4206 ((struct ifnet *)ifp)->if_mtu = mtu; 4207 return (0); 4208 } 4209 4210 int 4211 if_getmtu(if_t ifp) 4212 { 4213 return ((struct ifnet *)ifp)->if_mtu; 4214 } 4215 4216 int 4217 if_getmtu_family(if_t ifp, int family) 4218 { 4219 struct domain *dp; 4220 4221 for (dp = domains; dp; dp = dp->dom_next) { 4222 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4223 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4224 } 4225 4226 return (((struct ifnet *)ifp)->if_mtu); 4227 } 4228 4229 /* 4230 * Methods for drivers to access interface unicast and multicast 4231 * link level addresses. Driver shall not know 'struct ifaddr' neither 4232 * 'struct ifmultiaddr'. 4233 */ 4234 u_int 4235 if_lladdr_count(if_t ifp) 4236 { 4237 struct epoch_tracker et; 4238 struct ifaddr *ifa; 4239 u_int count; 4240 4241 count = 0; 4242 NET_EPOCH_ENTER(et); 4243 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4244 if (ifa->ifa_addr->sa_family == AF_LINK) 4245 count++; 4246 NET_EPOCH_EXIT(et); 4247 4248 return (count); 4249 } 4250 4251 u_int 4252 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4253 { 4254 struct epoch_tracker et; 4255 struct ifaddr *ifa; 4256 u_int count; 4257 4258 MPASS(cb); 4259 4260 count = 0; 4261 NET_EPOCH_ENTER(et); 4262 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 4263 if (ifa->ifa_addr->sa_family != AF_LINK) 4264 continue; 4265 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr, 4266 count); 4267 } 4268 NET_EPOCH_EXIT(et); 4269 4270 return (count); 4271 } 4272 4273 u_int 4274 if_llmaddr_count(if_t ifp) 4275 { 4276 struct epoch_tracker et; 4277 struct ifmultiaddr *ifma; 4278 int count; 4279 4280 count = 0; 4281 NET_EPOCH_ENTER(et); 4282 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4283 if (ifma->ifma_addr->sa_family == AF_LINK) 4284 count++; 4285 NET_EPOCH_EXIT(et); 4286 4287 return (count); 4288 } 4289 4290 u_int 4291 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4292 { 4293 struct epoch_tracker et; 4294 struct ifmultiaddr *ifma; 4295 u_int count; 4296 4297 MPASS(cb); 4298 4299 count = 0; 4300 NET_EPOCH_ENTER(et); 4301 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 4302 if (ifma->ifma_addr->sa_family != AF_LINK) 4303 continue; 4304 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr, 4305 count); 4306 } 4307 NET_EPOCH_EXIT(et); 4308 4309 return (count); 4310 } 4311 4312 int 4313 if_setsoftc(if_t ifp, void *softc) 4314 { 4315 ((struct ifnet *)ifp)->if_softc = softc; 4316 return (0); 4317 } 4318 4319 void * 4320 if_getsoftc(if_t ifp) 4321 { 4322 return ((struct ifnet *)ifp)->if_softc; 4323 } 4324 4325 void 4326 if_setrcvif(struct mbuf *m, if_t ifp) 4327 { 4328 4329 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4330 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4331 } 4332 4333 void 4334 if_setvtag(struct mbuf *m, uint16_t tag) 4335 { 4336 m->m_pkthdr.ether_vtag = tag; 4337 } 4338 4339 uint16_t 4340 if_getvtag(struct mbuf *m) 4341 { 4342 4343 return (m->m_pkthdr.ether_vtag); 4344 } 4345 4346 int 4347 if_sendq_empty(if_t ifp) 4348 { 4349 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4350 } 4351 4352 struct ifaddr * 4353 if_getifaddr(if_t ifp) 4354 { 4355 return ((struct ifnet *)ifp)->if_addr; 4356 } 4357 4358 int 4359 if_getamcount(if_t ifp) 4360 { 4361 return ((struct ifnet *)ifp)->if_amcount; 4362 } 4363 4364 4365 int 4366 if_setsendqready(if_t ifp) 4367 { 4368 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4369 return (0); 4370 } 4371 4372 int 4373 if_setsendqlen(if_t ifp, int tx_desc_count) 4374 { 4375 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4376 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4377 4378 return (0); 4379 } 4380 4381 int 4382 if_vlantrunkinuse(if_t ifp) 4383 { 4384 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4385 } 4386 4387 int 4388 if_input(if_t ifp, struct mbuf* sendmp) 4389 { 4390 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4391 return (0); 4392 4393 } 4394 4395 struct mbuf * 4396 if_dequeue(if_t ifp) 4397 { 4398 struct mbuf *m; 4399 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4400 4401 return (m); 4402 } 4403 4404 int 4405 if_sendq_prepend(if_t ifp, struct mbuf *m) 4406 { 4407 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4408 return (0); 4409 } 4410 4411 int 4412 if_setifheaderlen(if_t ifp, int len) 4413 { 4414 ((struct ifnet *)ifp)->if_hdrlen = len; 4415 return (0); 4416 } 4417 4418 caddr_t 4419 if_getlladdr(if_t ifp) 4420 { 4421 return (IF_LLADDR((struct ifnet *)ifp)); 4422 } 4423 4424 void * 4425 if_gethandle(u_char type) 4426 { 4427 return (if_alloc(type)); 4428 } 4429 4430 void 4431 if_bpfmtap(if_t ifh, struct mbuf *m) 4432 { 4433 struct ifnet *ifp = (struct ifnet *)ifh; 4434 4435 BPF_MTAP(ifp, m); 4436 } 4437 4438 void 4439 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4440 { 4441 struct ifnet *ifp = (struct ifnet *)ifh; 4442 4443 ETHER_BPF_MTAP(ifp, m); 4444 } 4445 4446 void 4447 if_vlancap(if_t ifh) 4448 { 4449 struct ifnet *ifp = (struct ifnet *)ifh; 4450 VLAN_CAPABILITIES(ifp); 4451 } 4452 4453 int 4454 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4455 { 4456 4457 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4458 return (0); 4459 } 4460 4461 int 4462 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4463 { 4464 4465 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4466 return (0); 4467 } 4468 4469 int 4470 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4471 { 4472 4473 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4474 return (0); 4475 } 4476 4477 u_int 4478 if_gethwtsomax(if_t ifp) 4479 { 4480 4481 return (((struct ifnet *)ifp)->if_hw_tsomax); 4482 } 4483 4484 u_int 4485 if_gethwtsomaxsegcount(if_t ifp) 4486 { 4487 4488 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4489 } 4490 4491 u_int 4492 if_gethwtsomaxsegsize(if_t ifp) 4493 { 4494 4495 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4496 } 4497 4498 void 4499 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4500 { 4501 ((struct ifnet *)ifp)->if_init = init_fn; 4502 } 4503 4504 void 4505 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4506 { 4507 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4508 } 4509 4510 void 4511 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4512 { 4513 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4514 } 4515 4516 void 4517 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4518 { 4519 ((struct ifnet *)ifp)->if_transmit = start_fn; 4520 } 4521 4522 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4523 { 4524 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4525 4526 } 4527 4528 void 4529 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4530 { 4531 4532 ifp->if_get_counter = fn; 4533 } 4534 4535 /* Revisit these - These are inline functions originally. */ 4536 int 4537 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4538 { 4539 return drbr_inuse(ifh, br); 4540 } 4541 4542 struct mbuf* 4543 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4544 { 4545 return drbr_dequeue(ifh, br); 4546 } 4547 4548 int 4549 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4550 { 4551 return drbr_needs_enqueue(ifh, br); 4552 } 4553 4554 int 4555 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4556 { 4557 return drbr_enqueue(ifh, br, m); 4558 4559 } 4560