1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_bpf.h" 36 #include "opt_inet6.h" 37 #include "opt_inet.h" 38 39 #include <sys/param.h> 40 #include <sys/conf.h> 41 #include <sys/eventhandler.h> 42 #include <sys/malloc.h> 43 #include <sys/domainset.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/epoch.h> 47 #include <sys/mbuf.h> 48 #include <sys/systm.h> 49 #include <sys/priv.h> 50 #include <sys/proc.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/protosw.h> 54 #include <sys/kernel.h> 55 #include <sys/lock.h> 56 #include <sys/refcount.h> 57 #include <sys/module.h> 58 #include <sys/rwlock.h> 59 #include <sys/sockio.h> 60 #include <sys/syslog.h> 61 #include <sys/sysctl.h> 62 #include <sys/sysent.h> 63 #include <sys/taskqueue.h> 64 #include <sys/domain.h> 65 #include <sys/jail.h> 66 #include <sys/priv.h> 67 68 #include <machine/stdarg.h> 69 #include <vm/uma.h> 70 71 #include <net/bpf.h> 72 #include <net/ethernet.h> 73 #include <net/if.h> 74 #include <net/if_arp.h> 75 #include <net/if_clone.h> 76 #include <net/if_dl.h> 77 #include <net/if_types.h> 78 #include <net/if_var.h> 79 #include <net/if_media.h> 80 #include <net/if_vlan_var.h> 81 #include <net/radix.h> 82 #include <net/route.h> 83 #include <net/route/route_ctl.h> 84 #include <net/vnet.h> 85 86 #if defined(INET) || defined(INET6) 87 #include <net/ethernet.h> 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip.h> 91 #include <netinet/ip_carp.h> 92 #ifdef INET 93 #include <net/debugnet.h> 94 #include <netinet/if_ether.h> 95 #endif /* INET */ 96 #ifdef INET6 97 #include <netinet6/in6_var.h> 98 #include <netinet6/in6_ifattach.h> 99 #endif /* INET6 */ 100 #endif /* INET || INET6 */ 101 102 #include <security/mac/mac_framework.h> 103 104 /* 105 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 106 * and ifr_ifru when it is used in SIOCGIFCONF. 107 */ 108 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 109 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 110 111 __read_mostly epoch_t net_epoch_preempt; 112 #ifdef COMPAT_FREEBSD32 113 #include <sys/mount.h> 114 #include <compat/freebsd32/freebsd32.h> 115 116 struct ifreq_buffer32 { 117 uint32_t length; /* (size_t) */ 118 uint32_t buffer; /* (void *) */ 119 }; 120 121 /* 122 * Interface request structure used for socket 123 * ioctl's. All interface ioctl's must have parameter 124 * definitions which begin with ifr_name. The 125 * remainder may be interface specific. 126 */ 127 struct ifreq32 { 128 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 129 union { 130 struct sockaddr ifru_addr; 131 struct sockaddr ifru_dstaddr; 132 struct sockaddr ifru_broadaddr; 133 struct ifreq_buffer32 ifru_buffer; 134 short ifru_flags[2]; 135 short ifru_index; 136 int ifru_jid; 137 int ifru_metric; 138 int ifru_mtu; 139 int ifru_phys; 140 int ifru_media; 141 uint32_t ifru_data; 142 int ifru_cap[2]; 143 u_int ifru_fib; 144 u_char ifru_vlan_pcp; 145 } ifr_ifru; 146 }; 147 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 148 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 149 __offsetof(struct ifreq32, ifr_ifru)); 150 151 struct ifgroupreq32 { 152 char ifgr_name[IFNAMSIZ]; 153 u_int ifgr_len; 154 union { 155 char ifgru_group[IFNAMSIZ]; 156 uint32_t ifgru_groups; 157 } ifgr_ifgru; 158 }; 159 160 struct ifmediareq32 { 161 char ifm_name[IFNAMSIZ]; 162 int ifm_current; 163 int ifm_mask; 164 int ifm_status; 165 int ifm_active; 166 int ifm_count; 167 uint32_t ifm_ulist; /* (int *) */ 168 }; 169 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 170 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 171 172 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 173 _IOC_NEWTYPE((cmd), struct ifgroupreq32): case 174 #else /* !COMPAT_FREEBSD32 */ 175 #define _CASE_IOC_IFGROUPREQ_32(cmd) 176 #endif /* !COMPAT_FREEBSD32 */ 177 178 #define CASE_IOC_IFGROUPREQ(cmd) \ 179 _CASE_IOC_IFGROUPREQ_32(cmd) \ 180 (cmd) 181 182 union ifreq_union { 183 struct ifreq ifr; 184 #ifdef COMPAT_FREEBSD32 185 struct ifreq32 ifr32; 186 #endif 187 }; 188 189 union ifgroupreq_union { 190 struct ifgroupreq ifgr; 191 #ifdef COMPAT_FREEBSD32 192 struct ifgroupreq32 ifgr32; 193 #endif 194 }; 195 196 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 197 "Link layers"); 198 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 199 "Generic link-management"); 200 201 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 202 &ifqmaxlen, 0, "max send queue size"); 203 204 /* Log link state change events */ 205 static int log_link_state_change = 1; 206 207 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 208 &log_link_state_change, 0, 209 "log interface link state change events"); 210 211 /* Log promiscuous mode change events */ 212 static int log_promisc_mode_change = 1; 213 214 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 215 &log_promisc_mode_change, 1, 216 "log promiscuous mode change events"); 217 218 /* Interface description */ 219 static unsigned int ifdescr_maxlen = 1024; 220 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 221 &ifdescr_maxlen, 0, 222 "administrative maximum length for interface description"); 223 224 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 225 226 /* global sx for non-critical path ifdescr */ 227 static struct sx ifdescr_sx; 228 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 229 230 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 231 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 232 /* These are external hooks for CARP. */ 233 void (*carp_linkstate_p)(struct ifnet *ifp); 234 void (*carp_demote_adj_p)(int, char *); 235 int (*carp_master_p)(struct ifaddr *); 236 #if defined(INET) || defined(INET6) 237 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 238 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 239 const struct sockaddr *sa); 240 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 241 int (*carp_attach_p)(struct ifaddr *, int); 242 void (*carp_detach_p)(struct ifaddr *, bool); 243 #endif 244 #ifdef INET 245 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 246 #endif 247 #ifdef INET6 248 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 249 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 250 const struct in6_addr *taddr); 251 #endif 252 253 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 254 255 /* 256 * XXX: Style; these should be sorted alphabetically, and unprototyped 257 * static functions should be prototyped. Currently they are sorted by 258 * declaration order. 259 */ 260 static void if_attachdomain(void *); 261 static void if_attachdomain1(struct ifnet *); 262 static int ifconf(u_long, caddr_t); 263 static void *if_grow(void); 264 static void if_input_default(struct ifnet *, struct mbuf *); 265 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 266 static void if_route(struct ifnet *, int flag, int fam); 267 static int if_setflag(struct ifnet *, int, int, int *, int); 268 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 269 static void if_unroute(struct ifnet *, int flag, int fam); 270 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 271 static void do_link_state_change(void *, int); 272 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 273 static int if_getgroupmembers(struct ifgroupreq *); 274 static void if_delgroups(struct ifnet *); 275 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 276 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 277 static void if_siocaddmulti(void *, int); 278 #ifdef VIMAGE 279 static int if_vmove(struct ifnet *, struct vnet *); 280 #endif 281 282 #ifdef INET6 283 /* 284 * XXX: declare here to avoid to include many inet6 related files.. 285 * should be more generalized? 286 */ 287 extern void nd6_setmtu(struct ifnet *); 288 #endif 289 290 /* ipsec helper hooks */ 291 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 292 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 293 294 VNET_DEFINE(int, if_index); 295 int ifqmaxlen = IFQ_MAXLEN; 296 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 297 VNET_DEFINE(struct ifgrouphead, ifg_head); 298 299 VNET_DEFINE_STATIC(int, if_indexlim) = 8; 300 301 /* Table of ifnet by index. */ 302 VNET_DEFINE(struct ifnet **, ifindex_table); 303 304 #define V_if_indexlim VNET(if_indexlim) 305 #define V_ifindex_table VNET(ifindex_table) 306 307 /* 308 * The global network interface list (V_ifnet) and related state (such as 309 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 310 * an rwlock. Either may be acquired shared to stablize the list, but both 311 * must be acquired writable to modify the list. This model allows us to 312 * both stablize the interface list during interrupt thread processing, but 313 * also to stablize it over long-running ioctls, without introducing priority 314 * inversions and deadlocks. 315 */ 316 struct rwlock ifnet_rwlock; 317 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 318 struct sx ifnet_sxlock; 319 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 320 321 /* 322 * The allocation of network interfaces is a rather non-atomic affair; we 323 * need to select an index before we are ready to expose the interface for 324 * use, so will use this pointer value to indicate reservation. 325 */ 326 #define IFNET_HOLD (void *)(uintptr_t)(-1) 327 328 #ifdef VIMAGE 329 #define VNET_IS_SHUTTING_DOWN(_vnet) \ 330 ((_vnet)->vnet_shutdown && (_vnet)->vnet_state < SI_SUB_VNET_DONE) 331 #endif 332 333 static if_com_alloc_t *if_com_alloc[256]; 334 static if_com_free_t *if_com_free[256]; 335 336 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 337 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 338 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 339 340 struct ifnet * 341 ifnet_byindex(u_short idx) 342 { 343 struct ifnet *ifp; 344 345 if (__predict_false(idx > V_if_index)) 346 return (NULL); 347 348 ifp = *(struct ifnet * const volatile *)(V_ifindex_table + idx); 349 return (__predict_false(ifp == IFNET_HOLD) ? NULL : ifp); 350 } 351 352 struct ifnet * 353 ifnet_byindex_ref(u_short idx) 354 { 355 struct ifnet *ifp; 356 357 NET_EPOCH_ASSERT(); 358 359 ifp = ifnet_byindex(idx); 360 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) 361 return (NULL); 362 if_ref(ifp); 363 return (ifp); 364 } 365 366 /* 367 * Allocate an ifindex array entry; return 0 on success or an error on 368 * failure. 369 */ 370 static u_short 371 ifindex_alloc(void **old) 372 { 373 u_short idx; 374 375 IFNET_WLOCK_ASSERT(); 376 /* 377 * Try to find an empty slot below V_if_index. If we fail, take the 378 * next slot. 379 */ 380 for (idx = 1; idx <= V_if_index; idx++) { 381 if (V_ifindex_table[idx] == NULL) 382 break; 383 } 384 385 /* Catch if_index overflow. */ 386 if (idx >= V_if_indexlim) { 387 *old = if_grow(); 388 return (USHRT_MAX); 389 } 390 if (idx > V_if_index) 391 V_if_index = idx; 392 return (idx); 393 } 394 395 static void 396 ifindex_free_locked(u_short idx) 397 { 398 399 IFNET_WLOCK_ASSERT(); 400 401 V_ifindex_table[idx] = NULL; 402 while (V_if_index > 0 && 403 V_ifindex_table[V_if_index] == NULL) 404 V_if_index--; 405 } 406 407 static void 408 ifindex_free(u_short idx) 409 { 410 411 IFNET_WLOCK(); 412 ifindex_free_locked(idx); 413 IFNET_WUNLOCK(); 414 } 415 416 static void 417 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 418 { 419 420 V_ifindex_table[idx] = ifp; 421 } 422 423 struct ifaddr * 424 ifaddr_byindex(u_short idx) 425 { 426 struct ifnet *ifp; 427 struct ifaddr *ifa = NULL; 428 429 NET_EPOCH_ASSERT(); 430 431 ifp = ifnet_byindex(idx); 432 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 433 ifa_ref(ifa); 434 return (ifa); 435 } 436 437 /* 438 * Network interface utility routines. 439 * 440 * Routines with ifa_ifwith* names take sockaddr *'s as 441 * parameters. 442 */ 443 444 static void 445 vnet_if_init(const void *unused __unused) 446 { 447 void *old; 448 449 CK_STAILQ_INIT(&V_ifnet); 450 CK_STAILQ_INIT(&V_ifg_head); 451 IFNET_WLOCK(); 452 old = if_grow(); /* create initial table */ 453 IFNET_WUNLOCK(); 454 epoch_wait_preempt(net_epoch_preempt); 455 free(old, M_IFNET); 456 vnet_if_clone_init(); 457 } 458 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 459 NULL); 460 461 #ifdef VIMAGE 462 static void 463 vnet_if_uninit(const void *unused __unused) 464 { 465 466 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 467 "not empty", __func__, __LINE__, &V_ifnet)); 468 VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 469 "not empty", __func__, __LINE__, &V_ifg_head)); 470 471 free((caddr_t)V_ifindex_table, M_IFNET); 472 } 473 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 474 vnet_if_uninit, NULL); 475 476 static void 477 vnet_if_return(const void *unused __unused) 478 { 479 struct ifnet *ifp, *nifp; 480 481 /* Return all inherited interfaces to their parent vnets. */ 482 CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 483 if (ifp->if_home_vnet != ifp->if_vnet) 484 if_vmove(ifp, ifp->if_home_vnet); 485 } 486 } 487 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 488 vnet_if_return, NULL); 489 #endif 490 491 492 static void * 493 if_grow(void) 494 { 495 int oldlim; 496 u_int n; 497 struct ifnet **e; 498 void *old; 499 500 old = NULL; 501 IFNET_WLOCK_ASSERT(); 502 oldlim = V_if_indexlim; 503 IFNET_WUNLOCK(); 504 n = (oldlim << 1) * sizeof(*e); 505 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 506 IFNET_WLOCK(); 507 if (V_if_indexlim != oldlim) { 508 free(e, M_IFNET); 509 return (NULL); 510 } 511 if (V_ifindex_table != NULL) { 512 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 513 old = V_ifindex_table; 514 } 515 V_if_indexlim <<= 1; 516 V_ifindex_table = e; 517 return (old); 518 } 519 520 /* 521 * Allocate a struct ifnet and an index for an interface. A layer 2 522 * common structure will also be allocated if an allocation routine is 523 * registered for the passed type. 524 */ 525 struct ifnet * 526 if_alloc_domain(u_char type, int numa_domain) 527 { 528 struct ifnet *ifp; 529 u_short idx; 530 void *old; 531 532 KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large")); 533 if (numa_domain == IF_NODOM) 534 ifp = malloc(sizeof(struct ifnet), M_IFNET, 535 M_WAITOK | M_ZERO); 536 else 537 ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET, 538 DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO); 539 restart: 540 IFNET_WLOCK(); 541 idx = ifindex_alloc(&old); 542 if (__predict_false(idx == USHRT_MAX)) { 543 IFNET_WUNLOCK(); 544 epoch_wait_preempt(net_epoch_preempt); 545 free(old, M_IFNET); 546 goto restart; 547 } 548 ifnet_setbyindex(idx, IFNET_HOLD); 549 IFNET_WUNLOCK(); 550 ifp->if_index = idx; 551 ifp->if_type = type; 552 ifp->if_alloctype = type; 553 ifp->if_numa_domain = numa_domain; 554 #ifdef VIMAGE 555 ifp->if_vnet = curvnet; 556 #endif 557 if (if_com_alloc[type] != NULL) { 558 ifp->if_l2com = if_com_alloc[type](type, ifp); 559 if (ifp->if_l2com == NULL) { 560 free(ifp, M_IFNET); 561 ifindex_free(idx); 562 return (NULL); 563 } 564 } 565 566 IF_ADDR_LOCK_INIT(ifp); 567 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 568 TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp); 569 ifp->if_afdata_initialized = 0; 570 IF_AFDATA_LOCK_INIT(ifp); 571 CK_STAILQ_INIT(&ifp->if_addrhead); 572 CK_STAILQ_INIT(&ifp->if_multiaddrs); 573 CK_STAILQ_INIT(&ifp->if_groups); 574 #ifdef MAC 575 mac_ifnet_init(ifp); 576 #endif 577 ifq_init(&ifp->if_snd, ifp); 578 579 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 580 for (int i = 0; i < IFCOUNTERS; i++) 581 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 582 ifp->if_get_counter = if_get_counter_default; 583 ifp->if_pcp = IFNET_PCP_NONE; 584 ifnet_setbyindex(ifp->if_index, ifp); 585 return (ifp); 586 } 587 588 struct ifnet * 589 if_alloc_dev(u_char type, device_t dev) 590 { 591 int numa_domain; 592 593 if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0) 594 return (if_alloc_domain(type, IF_NODOM)); 595 return (if_alloc_domain(type, numa_domain)); 596 } 597 598 struct ifnet * 599 if_alloc(u_char type) 600 { 601 602 return (if_alloc_domain(type, IF_NODOM)); 603 } 604 /* 605 * Do the actual work of freeing a struct ifnet, and layer 2 common 606 * structure. This call is made when the last reference to an 607 * interface is released. 608 */ 609 static void 610 if_free_internal(struct ifnet *ifp) 611 { 612 613 KASSERT((ifp->if_flags & IFF_DYING), 614 ("if_free_internal: interface not dying")); 615 616 if (if_com_free[ifp->if_alloctype] != NULL) 617 if_com_free[ifp->if_alloctype](ifp->if_l2com, 618 ifp->if_alloctype); 619 620 #ifdef MAC 621 mac_ifnet_destroy(ifp); 622 #endif /* MAC */ 623 IF_AFDATA_DESTROY(ifp); 624 IF_ADDR_LOCK_DESTROY(ifp); 625 ifq_delete(&ifp->if_snd); 626 627 for (int i = 0; i < IFCOUNTERS; i++) 628 counter_u64_free(ifp->if_counters[i]); 629 630 free(ifp->if_description, M_IFDESCR); 631 free(ifp->if_hw_addr, M_IFADDR); 632 if (ifp->if_numa_domain == IF_NODOM) 633 free(ifp, M_IFNET); 634 else 635 free_domain(ifp, M_IFNET); 636 } 637 638 static void 639 if_destroy(epoch_context_t ctx) 640 { 641 struct ifnet *ifp; 642 643 ifp = __containerof(ctx, struct ifnet, if_epoch_ctx); 644 if_free_internal(ifp); 645 } 646 647 /* 648 * Deregister an interface and free the associated storage. 649 */ 650 void 651 if_free(struct ifnet *ifp) 652 { 653 654 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 655 656 CURVNET_SET_QUIET(ifp->if_vnet); 657 IFNET_WLOCK(); 658 KASSERT(ifp == ifnet_byindex(ifp->if_index), 659 ("%s: freeing unallocated ifnet", ifp->if_xname)); 660 661 ifindex_free_locked(ifp->if_index); 662 IFNET_WUNLOCK(); 663 664 if (refcount_release(&ifp->if_refcount)) 665 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 666 CURVNET_RESTORE(); 667 } 668 669 /* 670 * Interfaces to keep an ifnet type-stable despite the possibility of the 671 * driver calling if_free(). If there are additional references, we defer 672 * freeing the underlying data structure. 673 */ 674 void 675 if_ref(struct ifnet *ifp) 676 { 677 678 /* We don't assert the ifnet list lock here, but arguably should. */ 679 refcount_acquire(&ifp->if_refcount); 680 } 681 682 void 683 if_rele(struct ifnet *ifp) 684 { 685 686 if (!refcount_release(&ifp->if_refcount)) 687 return; 688 NET_EPOCH_CALL(if_destroy, &ifp->if_epoch_ctx); 689 } 690 691 void 692 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 693 { 694 695 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 696 697 if (ifq->ifq_maxlen == 0) 698 ifq->ifq_maxlen = ifqmaxlen; 699 700 ifq->altq_type = 0; 701 ifq->altq_disc = NULL; 702 ifq->altq_flags &= ALTQF_CANTCHANGE; 703 ifq->altq_tbr = NULL; 704 ifq->altq_ifp = ifp; 705 } 706 707 void 708 ifq_delete(struct ifaltq *ifq) 709 { 710 mtx_destroy(&ifq->ifq_mtx); 711 } 712 713 /* 714 * Perform generic interface initialization tasks and attach the interface 715 * to the list of "active" interfaces. If vmove flag is set on entry 716 * to if_attach_internal(), perform only a limited subset of initialization 717 * tasks, given that we are moving from one vnet to another an ifnet which 718 * has already been fully initialized. 719 * 720 * Note that if_detach_internal() removes group membership unconditionally 721 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 722 * Thus, when if_vmove() is applied to a cloned interface, group membership 723 * is lost while a cloned one always joins a group whose name is 724 * ifc->ifc_name. To recover this after if_detach_internal() and 725 * if_attach_internal(), the cloner should be specified to 726 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 727 * attempts to join a group whose name is ifc->ifc_name. 728 * 729 * XXX: 730 * - The decision to return void and thus require this function to 731 * succeed is questionable. 732 * - We should probably do more sanity checking. For instance we don't 733 * do anything to insure if_xname is unique or non-empty. 734 */ 735 void 736 if_attach(struct ifnet *ifp) 737 { 738 739 if_attach_internal(ifp, 0, NULL); 740 } 741 742 /* 743 * Compute the least common TSO limit. 744 */ 745 void 746 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 747 { 748 /* 749 * 1) If there is no limit currently, take the limit from 750 * the network adapter. 751 * 752 * 2) If the network adapter has a limit below the current 753 * limit, apply it. 754 */ 755 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 756 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 757 pmax->tsomaxbytes = ifp->if_hw_tsomax; 758 } 759 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 760 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 761 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 762 } 763 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 764 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 765 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 766 } 767 } 768 769 /* 770 * Update TSO limit of a network adapter. 771 * 772 * Returns zero if no change. Else non-zero. 773 */ 774 int 775 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 776 { 777 int retval = 0; 778 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 779 ifp->if_hw_tsomax = pmax->tsomaxbytes; 780 retval++; 781 } 782 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 783 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 784 retval++; 785 } 786 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 787 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 788 retval++; 789 } 790 return (retval); 791 } 792 793 static void 794 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 795 { 796 unsigned socksize, ifasize; 797 int namelen, masklen; 798 struct sockaddr_dl *sdl; 799 struct ifaddr *ifa; 800 801 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 802 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 803 ifp->if_xname); 804 805 #ifdef VIMAGE 806 ifp->if_vnet = curvnet; 807 if (ifp->if_home_vnet == NULL) 808 ifp->if_home_vnet = curvnet; 809 #endif 810 811 if_addgroup(ifp, IFG_ALL); 812 813 /* Restore group membership for cloned interfaces. */ 814 if (vmove && ifc != NULL) 815 if_clone_addgroup(ifp, ifc); 816 817 getmicrotime(&ifp->if_lastchange); 818 ifp->if_epoch = time_uptime; 819 820 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 821 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 822 ("transmit and qflush must both either be set or both be NULL")); 823 if (ifp->if_transmit == NULL) { 824 ifp->if_transmit = if_transmit; 825 ifp->if_qflush = if_qflush; 826 } 827 if (ifp->if_input == NULL) 828 ifp->if_input = if_input_default; 829 830 if (ifp->if_requestencap == NULL) 831 ifp->if_requestencap = if_requestencap_default; 832 833 if (!vmove) { 834 #ifdef MAC 835 mac_ifnet_create(ifp); 836 #endif 837 838 /* 839 * Create a Link Level name for this device. 840 */ 841 namelen = strlen(ifp->if_xname); 842 /* 843 * Always save enough space for any possiable name so we 844 * can do a rename in place later. 845 */ 846 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 847 socksize = masklen + ifp->if_addrlen; 848 if (socksize < sizeof(*sdl)) 849 socksize = sizeof(*sdl); 850 socksize = roundup2(socksize, sizeof(long)); 851 ifasize = sizeof(*ifa) + 2 * socksize; 852 ifa = ifa_alloc(ifasize, M_WAITOK); 853 sdl = (struct sockaddr_dl *)(ifa + 1); 854 sdl->sdl_len = socksize; 855 sdl->sdl_family = AF_LINK; 856 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 857 sdl->sdl_nlen = namelen; 858 sdl->sdl_index = ifp->if_index; 859 sdl->sdl_type = ifp->if_type; 860 ifp->if_addr = ifa; 861 ifa->ifa_ifp = ifp; 862 ifa->ifa_addr = (struct sockaddr *)sdl; 863 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 864 ifa->ifa_netmask = (struct sockaddr *)sdl; 865 sdl->sdl_len = masklen; 866 while (namelen != 0) 867 sdl->sdl_data[--namelen] = 0xff; 868 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 869 /* Reliably crash if used uninitialized. */ 870 ifp->if_broadcastaddr = NULL; 871 872 if (ifp->if_type == IFT_ETHER) { 873 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 874 M_WAITOK | M_ZERO); 875 } 876 877 #if defined(INET) || defined(INET6) 878 /* Use defaults for TSO, if nothing is set */ 879 if (ifp->if_hw_tsomax == 0 && 880 ifp->if_hw_tsomaxsegcount == 0 && 881 ifp->if_hw_tsomaxsegsize == 0) { 882 /* 883 * The TSO defaults needs to be such that an 884 * NFS mbuf list of 35 mbufs totalling just 885 * below 64K works and that a chain of mbufs 886 * can be defragged into at most 32 segments: 887 */ 888 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 889 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 890 ifp->if_hw_tsomaxsegcount = 35; 891 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 892 893 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 894 if (ifp->if_capabilities & IFCAP_TSO) { 895 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 896 ifp->if_hw_tsomax, 897 ifp->if_hw_tsomaxsegcount, 898 ifp->if_hw_tsomaxsegsize); 899 } 900 } 901 #endif 902 } 903 #ifdef VIMAGE 904 else { 905 /* 906 * Update the interface index in the link layer address 907 * of the interface. 908 */ 909 for (ifa = ifp->if_addr; ifa != NULL; 910 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 911 if (ifa->ifa_addr->sa_family == AF_LINK) { 912 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 913 sdl->sdl_index = ifp->if_index; 914 } 915 } 916 } 917 #endif 918 919 IFNET_WLOCK(); 920 CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 921 #ifdef VIMAGE 922 curvnet->vnet_ifcnt++; 923 #endif 924 IFNET_WUNLOCK(); 925 926 if (domain_init_status >= 2) 927 if_attachdomain1(ifp); 928 929 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 930 if (IS_DEFAULT_VNET(curvnet)) 931 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 932 933 /* Announce the interface. */ 934 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 935 } 936 937 static void 938 if_epochalloc(void *dummy __unused) 939 { 940 941 net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT); 942 } 943 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL); 944 945 static void 946 if_attachdomain(void *dummy) 947 { 948 struct ifnet *ifp; 949 950 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 951 if_attachdomain1(ifp); 952 } 953 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 954 if_attachdomain, NULL); 955 956 static void 957 if_attachdomain1(struct ifnet *ifp) 958 { 959 struct domain *dp; 960 961 /* 962 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 963 * cannot lock ifp->if_afdata initialization, entirely. 964 */ 965 IF_AFDATA_LOCK(ifp); 966 if (ifp->if_afdata_initialized >= domain_init_status) { 967 IF_AFDATA_UNLOCK(ifp); 968 log(LOG_WARNING, "%s called more than once on %s\n", 969 __func__, ifp->if_xname); 970 return; 971 } 972 ifp->if_afdata_initialized = domain_init_status; 973 IF_AFDATA_UNLOCK(ifp); 974 975 /* address family dependent data region */ 976 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 977 for (dp = domains; dp; dp = dp->dom_next) { 978 if (dp->dom_ifattach) 979 ifp->if_afdata[dp->dom_family] = 980 (*dp->dom_ifattach)(ifp); 981 } 982 } 983 984 /* 985 * Remove any unicast or broadcast network addresses from an interface. 986 */ 987 void 988 if_purgeaddrs(struct ifnet *ifp) 989 { 990 struct ifaddr *ifa; 991 992 while (1) { 993 struct epoch_tracker et; 994 995 NET_EPOCH_ENTER(et); 996 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 997 if (ifa->ifa_addr->sa_family != AF_LINK) 998 break; 999 } 1000 NET_EPOCH_EXIT(et); 1001 1002 if (ifa == NULL) 1003 break; 1004 #ifdef INET 1005 /* XXX: Ugly!! ad hoc just for INET */ 1006 if (ifa->ifa_addr->sa_family == AF_INET) { 1007 struct ifaliasreq ifr; 1008 1009 bzero(&ifr, sizeof(ifr)); 1010 ifr.ifra_addr = *ifa->ifa_addr; 1011 if (ifa->ifa_dstaddr) 1012 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1013 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 1014 NULL) == 0) 1015 continue; 1016 } 1017 #endif /* INET */ 1018 #ifdef INET6 1019 if (ifa->ifa_addr->sa_family == AF_INET6) { 1020 in6_purgeaddr(ifa); 1021 /* ifp_addrhead is already updated */ 1022 continue; 1023 } 1024 #endif /* INET6 */ 1025 IF_ADDR_WLOCK(ifp); 1026 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1027 IF_ADDR_WUNLOCK(ifp); 1028 ifa_free(ifa); 1029 } 1030 } 1031 1032 /* 1033 * Remove any multicast network addresses from an interface when an ifnet 1034 * is going away. 1035 */ 1036 static void 1037 if_purgemaddrs(struct ifnet *ifp) 1038 { 1039 struct ifmultiaddr *ifma; 1040 1041 IF_ADDR_WLOCK(ifp); 1042 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1043 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1044 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1045 if_delmulti_locked(ifp, ifma, 1); 1046 } 1047 IF_ADDR_WUNLOCK(ifp); 1048 } 1049 1050 /* 1051 * Detach an interface, removing it from the list of "active" interfaces. 1052 * If vmove flag is set on entry to if_detach_internal(), perform only a 1053 * limited subset of cleanup tasks, given that we are moving an ifnet from 1054 * one vnet to another, where it must be fully operational. 1055 * 1056 * XXXRW: There are some significant questions about event ordering, and 1057 * how to prevent things from starting to use the interface during detach. 1058 */ 1059 void 1060 if_detach(struct ifnet *ifp) 1061 { 1062 1063 CURVNET_SET_QUIET(ifp->if_vnet); 1064 if_detach_internal(ifp, 0, NULL); 1065 CURVNET_RESTORE(); 1066 } 1067 1068 /* 1069 * The vmove flag, if set, indicates that we are called from a callpath 1070 * that is moving an interface to a different vnet instance. 1071 * 1072 * The shutdown flag, if set, indicates that we are called in the 1073 * process of shutting down a vnet instance. Currently only the 1074 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1075 * on a vnet instance shutdown without this flag being set, e.g., when 1076 * the cloned interfaces are destoyed as first thing of teardown. 1077 */ 1078 static int 1079 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1080 { 1081 struct ifaddr *ifa; 1082 int i; 1083 struct domain *dp; 1084 struct ifnet *iter; 1085 int found = 0; 1086 #ifdef VIMAGE 1087 bool shutdown; 1088 1089 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1090 #endif 1091 IFNET_WLOCK(); 1092 CK_STAILQ_FOREACH(iter, &V_ifnet, if_link) 1093 if (iter == ifp) { 1094 CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link); 1095 if (!vmove) 1096 ifp->if_flags |= IFF_DYING; 1097 found = 1; 1098 break; 1099 } 1100 IFNET_WUNLOCK(); 1101 if (!found) { 1102 /* 1103 * While we would want to panic here, we cannot 1104 * guarantee that the interface is indeed still on 1105 * the list given we don't hold locks all the way. 1106 */ 1107 return (ENOENT); 1108 #if 0 1109 if (vmove) 1110 panic("%s: ifp=%p not on the ifnet tailq %p", 1111 __func__, ifp, &V_ifnet); 1112 else 1113 return; /* XXX this should panic as well? */ 1114 #endif 1115 } 1116 1117 /* 1118 * At this point we know the interface still was on the ifnet list 1119 * and we removed it so we are in a stable state. 1120 */ 1121 #ifdef VIMAGE 1122 curvnet->vnet_ifcnt--; 1123 #endif 1124 epoch_wait_preempt(net_epoch_preempt); 1125 1126 /* 1127 * Ensure all pending EPOCH(9) callbacks have been executed. This 1128 * fixes issues about late destruction of multicast options 1129 * which lead to leave group calls, which in turn access the 1130 * belonging ifnet structure: 1131 */ 1132 epoch_drain_callbacks(net_epoch_preempt); 1133 1134 /* 1135 * In any case (destroy or vmove) detach us from the groups 1136 * and remove/wait for pending events on the taskq. 1137 * XXX-BZ in theory an interface could still enqueue a taskq change? 1138 */ 1139 if_delgroups(ifp); 1140 1141 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1142 taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask); 1143 1144 /* 1145 * Check if this is a cloned interface or not. Must do even if 1146 * shutting down as a if_vmove_reclaim() would move the ifp and 1147 * the if_clone_addgroup() will have a corrupted string overwise 1148 * from a gibberish pointer. 1149 */ 1150 if (vmove && ifcp != NULL) 1151 *ifcp = if_clone_findifc(ifp); 1152 1153 if_down(ifp); 1154 1155 #ifdef VIMAGE 1156 /* 1157 * On VNET shutdown abort here as the stack teardown will do all 1158 * the work top-down for us. 1159 */ 1160 if (shutdown) { 1161 /* Give interface users the chance to clean up. */ 1162 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1163 1164 /* 1165 * In case of a vmove we are done here without error. 1166 * If we would signal an error it would lead to the same 1167 * abort as if we did not find the ifnet anymore. 1168 * if_detach() calls us in void context and does not care 1169 * about an early abort notification, so life is splendid :) 1170 */ 1171 goto finish_vnet_shutdown; 1172 } 1173 #endif 1174 1175 /* 1176 * At this point we are not tearing down a VNET and are either 1177 * going to destroy or vmove the interface and have to cleanup 1178 * accordingly. 1179 */ 1180 1181 /* 1182 * Remove routes and flush queues. 1183 */ 1184 #ifdef ALTQ 1185 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1186 altq_disable(&ifp->if_snd); 1187 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1188 altq_detach(&ifp->if_snd); 1189 #endif 1190 1191 if_purgeaddrs(ifp); 1192 1193 #ifdef INET 1194 in_ifdetach(ifp); 1195 #endif 1196 1197 #ifdef INET6 1198 /* 1199 * Remove all IPv6 kernel structs related to ifp. This should be done 1200 * before removing routing entries below, since IPv6 interface direct 1201 * routes are expected to be removed by the IPv6-specific kernel API. 1202 * Otherwise, the kernel will detect some inconsistency and bark it. 1203 */ 1204 in6_ifdetach(ifp); 1205 #endif 1206 if_purgemaddrs(ifp); 1207 1208 /* Announce that the interface is gone. */ 1209 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1210 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1211 if (IS_DEFAULT_VNET(curvnet)) 1212 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1213 1214 if (!vmove) { 1215 /* 1216 * Prevent further calls into the device driver via ifnet. 1217 */ 1218 if_dead(ifp); 1219 1220 /* 1221 * Clean up all addresses. 1222 */ 1223 IF_ADDR_WLOCK(ifp); 1224 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1225 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1226 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1227 IF_ADDR_WUNLOCK(ifp); 1228 ifa_free(ifa); 1229 } else 1230 IF_ADDR_WUNLOCK(ifp); 1231 } 1232 1233 rt_flushifroutes(ifp); 1234 1235 #ifdef VIMAGE 1236 finish_vnet_shutdown: 1237 #endif 1238 /* 1239 * We cannot hold the lock over dom_ifdetach calls as they might 1240 * sleep, for example trying to drain a callout, thus open up the 1241 * theoretical race with re-attaching. 1242 */ 1243 IF_AFDATA_LOCK(ifp); 1244 i = ifp->if_afdata_initialized; 1245 ifp->if_afdata_initialized = 0; 1246 IF_AFDATA_UNLOCK(ifp); 1247 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1248 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1249 (*dp->dom_ifdetach)(ifp, 1250 ifp->if_afdata[dp->dom_family]); 1251 ifp->if_afdata[dp->dom_family] = NULL; 1252 } 1253 } 1254 1255 return (0); 1256 } 1257 1258 #ifdef VIMAGE 1259 /* 1260 * if_vmove() performs a limited version of if_detach() in current 1261 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1262 * An attempt is made to shrink if_index in current vnet, find an 1263 * unused if_index in target vnet and calls if_grow() if necessary, 1264 * and finally find an unused if_xname for the target vnet. 1265 */ 1266 static int 1267 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1268 { 1269 struct if_clone *ifc; 1270 #ifdef DEV_BPF 1271 u_int bif_dlt, bif_hdrlen; 1272 #endif 1273 void *old; 1274 int rc; 1275 1276 #ifdef DEV_BPF 1277 /* 1278 * if_detach_internal() will call the eventhandler to notify 1279 * interface departure. That will detach if_bpf. We need to 1280 * safe the dlt and hdrlen so we can re-attach it later. 1281 */ 1282 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1283 #endif 1284 1285 /* 1286 * Detach from current vnet, but preserve LLADDR info, do not 1287 * mark as dead etc. so that the ifnet can be reattached later. 1288 * If we cannot find it, we lost the race to someone else. 1289 */ 1290 rc = if_detach_internal(ifp, 1, &ifc); 1291 if (rc != 0) 1292 return (rc); 1293 1294 /* 1295 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1296 * the if_index for that vnet if possible. 1297 * 1298 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1299 * or we'd lock on one vnet and unlock on another. 1300 */ 1301 IFNET_WLOCK(); 1302 ifindex_free_locked(ifp->if_index); 1303 IFNET_WUNLOCK(); 1304 1305 /* 1306 * Perform interface-specific reassignment tasks, if provided by 1307 * the driver. 1308 */ 1309 if (ifp->if_reassign != NULL) 1310 ifp->if_reassign(ifp, new_vnet, NULL); 1311 1312 /* 1313 * Switch to the context of the target vnet. 1314 */ 1315 CURVNET_SET_QUIET(new_vnet); 1316 restart: 1317 IFNET_WLOCK(); 1318 ifp->if_index = ifindex_alloc(&old); 1319 if (__predict_false(ifp->if_index == USHRT_MAX)) { 1320 IFNET_WUNLOCK(); 1321 epoch_wait_preempt(net_epoch_preempt); 1322 free(old, M_IFNET); 1323 goto restart; 1324 } 1325 ifnet_setbyindex(ifp->if_index, ifp); 1326 IFNET_WUNLOCK(); 1327 1328 if_attach_internal(ifp, 1, ifc); 1329 1330 #ifdef DEV_BPF 1331 if (ifp->if_bpf == NULL) 1332 bpfattach(ifp, bif_dlt, bif_hdrlen); 1333 #endif 1334 1335 CURVNET_RESTORE(); 1336 return (0); 1337 } 1338 1339 /* 1340 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1341 */ 1342 static int 1343 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1344 { 1345 struct prison *pr; 1346 struct ifnet *difp; 1347 int error; 1348 bool shutdown; 1349 1350 /* Try to find the prison within our visibility. */ 1351 sx_slock(&allprison_lock); 1352 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1353 sx_sunlock(&allprison_lock); 1354 if (pr == NULL) 1355 return (ENXIO); 1356 prison_hold_locked(pr); 1357 mtx_unlock(&pr->pr_mtx); 1358 1359 /* Do not try to move the iface from and to the same prison. */ 1360 if (pr->pr_vnet == ifp->if_vnet) { 1361 prison_free(pr); 1362 return (EEXIST); 1363 } 1364 1365 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1366 /* XXX Lock interfaces to avoid races. */ 1367 CURVNET_SET_QUIET(pr->pr_vnet); 1368 difp = ifunit(ifname); 1369 if (difp != NULL) { 1370 CURVNET_RESTORE(); 1371 prison_free(pr); 1372 return (EEXIST); 1373 } 1374 1375 /* Make sure the VNET is stable. */ 1376 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1377 if (shutdown) { 1378 CURVNET_RESTORE(); 1379 prison_free(pr); 1380 return (EBUSY); 1381 } 1382 CURVNET_RESTORE(); 1383 1384 /* Move the interface into the child jail/vnet. */ 1385 error = if_vmove(ifp, pr->pr_vnet); 1386 1387 /* Report the new if_xname back to the userland on success. */ 1388 if (error == 0) 1389 sprintf(ifname, "%s", ifp->if_xname); 1390 1391 prison_free(pr); 1392 return (error); 1393 } 1394 1395 static int 1396 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1397 { 1398 struct prison *pr; 1399 struct vnet *vnet_dst; 1400 struct ifnet *ifp; 1401 int error; 1402 bool shutdown; 1403 1404 /* Try to find the prison within our visibility. */ 1405 sx_slock(&allprison_lock); 1406 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1407 sx_sunlock(&allprison_lock); 1408 if (pr == NULL) 1409 return (ENXIO); 1410 prison_hold_locked(pr); 1411 mtx_unlock(&pr->pr_mtx); 1412 1413 /* Make sure the named iface exists in the source prison/vnet. */ 1414 CURVNET_SET(pr->pr_vnet); 1415 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1416 if (ifp == NULL) { 1417 CURVNET_RESTORE(); 1418 prison_free(pr); 1419 return (ENXIO); 1420 } 1421 1422 /* Do not try to move the iface from and to the same prison. */ 1423 vnet_dst = TD_TO_VNET(td); 1424 if (vnet_dst == ifp->if_vnet) { 1425 CURVNET_RESTORE(); 1426 prison_free(pr); 1427 return (EEXIST); 1428 } 1429 1430 /* Make sure the VNET is stable. */ 1431 shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet); 1432 if (shutdown) { 1433 CURVNET_RESTORE(); 1434 prison_free(pr); 1435 return (EBUSY); 1436 } 1437 1438 /* Get interface back from child jail/vnet. */ 1439 error = if_vmove(ifp, vnet_dst); 1440 CURVNET_RESTORE(); 1441 1442 /* Report the new if_xname back to the userland on success. */ 1443 if (error == 0) 1444 sprintf(ifname, "%s", ifp->if_xname); 1445 1446 prison_free(pr); 1447 return (error); 1448 } 1449 #endif /* VIMAGE */ 1450 1451 /* 1452 * Add a group to an interface 1453 */ 1454 int 1455 if_addgroup(struct ifnet *ifp, const char *groupname) 1456 { 1457 struct ifg_list *ifgl; 1458 struct ifg_group *ifg = NULL; 1459 struct ifg_member *ifgm; 1460 int new = 0; 1461 1462 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1463 groupname[strlen(groupname) - 1] <= '9') 1464 return (EINVAL); 1465 1466 IFNET_WLOCK(); 1467 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1468 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1469 IFNET_WUNLOCK(); 1470 return (EEXIST); 1471 } 1472 1473 if ((ifgl = malloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) { 1474 IFNET_WUNLOCK(); 1475 return (ENOMEM); 1476 } 1477 1478 if ((ifgm = malloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) { 1479 free(ifgl, M_TEMP); 1480 IFNET_WUNLOCK(); 1481 return (ENOMEM); 1482 } 1483 1484 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1485 if (!strcmp(ifg->ifg_group, groupname)) 1486 break; 1487 1488 if (ifg == NULL) { 1489 if ((ifg = malloc(sizeof(*ifg), M_TEMP, M_NOWAIT)) == NULL) { 1490 free(ifgl, M_TEMP); 1491 free(ifgm, M_TEMP); 1492 IFNET_WUNLOCK(); 1493 return (ENOMEM); 1494 } 1495 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1496 ifg->ifg_refcnt = 0; 1497 CK_STAILQ_INIT(&ifg->ifg_members); 1498 CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1499 new = 1; 1500 } 1501 1502 ifg->ifg_refcnt++; 1503 ifgl->ifgl_group = ifg; 1504 ifgm->ifgm_ifp = ifp; 1505 1506 IF_ADDR_WLOCK(ifp); 1507 CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1508 CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1509 IF_ADDR_WUNLOCK(ifp); 1510 1511 IFNET_WUNLOCK(); 1512 1513 if (new) 1514 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1515 EVENTHANDLER_INVOKE(group_change_event, groupname); 1516 1517 return (0); 1518 } 1519 1520 /* 1521 * Helper function to remove a group out of an interface. Expects the global 1522 * ifnet lock to be write-locked, and drops it before returning. 1523 */ 1524 static void 1525 _if_delgroup_locked(struct ifnet *ifp, struct ifg_list *ifgl, 1526 const char *groupname) 1527 { 1528 struct ifg_member *ifgm; 1529 bool freeifgl; 1530 1531 IFNET_WLOCK_ASSERT(); 1532 1533 IF_ADDR_WLOCK(ifp); 1534 CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next); 1535 IF_ADDR_WUNLOCK(ifp); 1536 1537 CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) { 1538 if (ifgm->ifgm_ifp == ifp) { 1539 CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1540 ifg_member, ifgm_next); 1541 break; 1542 } 1543 } 1544 1545 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1546 CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, 1547 ifg_next); 1548 freeifgl = true; 1549 } else { 1550 freeifgl = false; 1551 } 1552 IFNET_WUNLOCK(); 1553 1554 epoch_wait_preempt(net_epoch_preempt); 1555 if (freeifgl) { 1556 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1557 free(ifgl->ifgl_group, M_TEMP); 1558 } 1559 free(ifgm, M_TEMP); 1560 free(ifgl, M_TEMP); 1561 1562 EVENTHANDLER_INVOKE(group_change_event, groupname); 1563 } 1564 1565 /* 1566 * Remove a group from an interface 1567 */ 1568 int 1569 if_delgroup(struct ifnet *ifp, const char *groupname) 1570 { 1571 struct ifg_list *ifgl; 1572 1573 IFNET_WLOCK(); 1574 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1575 if (strcmp(ifgl->ifgl_group->ifg_group, groupname) == 0) 1576 break; 1577 if (ifgl == NULL) { 1578 IFNET_WUNLOCK(); 1579 return (ENOENT); 1580 } 1581 1582 _if_delgroup_locked(ifp, ifgl, groupname); 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * Remove an interface from all groups 1589 */ 1590 static void 1591 if_delgroups(struct ifnet *ifp) 1592 { 1593 struct ifg_list *ifgl; 1594 char groupname[IFNAMSIZ]; 1595 1596 IFNET_WLOCK(); 1597 while ((ifgl = CK_STAILQ_FIRST(&ifp->if_groups)) != NULL) { 1598 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1599 _if_delgroup_locked(ifp, ifgl, groupname); 1600 IFNET_WLOCK(); 1601 } 1602 IFNET_WUNLOCK(); 1603 } 1604 1605 static char * 1606 ifgr_group_get(void *ifgrp) 1607 { 1608 union ifgroupreq_union *ifgrup; 1609 1610 ifgrup = ifgrp; 1611 #ifdef COMPAT_FREEBSD32 1612 if (SV_CURPROC_FLAG(SV_ILP32)) 1613 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1614 #endif 1615 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1616 } 1617 1618 static struct ifg_req * 1619 ifgr_groups_get(void *ifgrp) 1620 { 1621 union ifgroupreq_union *ifgrup; 1622 1623 ifgrup = ifgrp; 1624 #ifdef COMPAT_FREEBSD32 1625 if (SV_CURPROC_FLAG(SV_ILP32)) 1626 return ((struct ifg_req *)(uintptr_t) 1627 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1628 #endif 1629 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1630 } 1631 1632 /* 1633 * Stores all groups from an interface in memory pointed to by ifgr. 1634 */ 1635 static int 1636 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1637 { 1638 int len, error; 1639 struct ifg_list *ifgl; 1640 struct ifg_req ifgrq, *ifgp; 1641 1642 NET_EPOCH_ASSERT(); 1643 1644 if (ifgr->ifgr_len == 0) { 1645 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1646 ifgr->ifgr_len += sizeof(struct ifg_req); 1647 return (0); 1648 } 1649 1650 len = ifgr->ifgr_len; 1651 ifgp = ifgr_groups_get(ifgr); 1652 /* XXX: wire */ 1653 CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1654 if (len < sizeof(ifgrq)) 1655 return (EINVAL); 1656 bzero(&ifgrq, sizeof ifgrq); 1657 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1658 sizeof(ifgrq.ifgrq_group)); 1659 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) 1660 return (error); 1661 len -= sizeof(ifgrq); 1662 ifgp++; 1663 } 1664 1665 return (0); 1666 } 1667 1668 /* 1669 * Stores all members of a group in memory pointed to by igfr 1670 */ 1671 static int 1672 if_getgroupmembers(struct ifgroupreq *ifgr) 1673 { 1674 struct ifg_group *ifg; 1675 struct ifg_member *ifgm; 1676 struct ifg_req ifgrq, *ifgp; 1677 int len, error; 1678 1679 IFNET_RLOCK(); 1680 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1681 if (strcmp(ifg->ifg_group, ifgr->ifgr_name) == 0) 1682 break; 1683 if (ifg == NULL) { 1684 IFNET_RUNLOCK(); 1685 return (ENOENT); 1686 } 1687 1688 if (ifgr->ifgr_len == 0) { 1689 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1690 ifgr->ifgr_len += sizeof(ifgrq); 1691 IFNET_RUNLOCK(); 1692 return (0); 1693 } 1694 1695 len = ifgr->ifgr_len; 1696 ifgp = ifgr_groups_get(ifgr); 1697 CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1698 if (len < sizeof(ifgrq)) { 1699 IFNET_RUNLOCK(); 1700 return (EINVAL); 1701 } 1702 bzero(&ifgrq, sizeof ifgrq); 1703 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1704 sizeof(ifgrq.ifgrq_member)); 1705 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1706 IFNET_RUNLOCK(); 1707 return (error); 1708 } 1709 len -= sizeof(ifgrq); 1710 ifgp++; 1711 } 1712 IFNET_RUNLOCK(); 1713 1714 return (0); 1715 } 1716 1717 /* 1718 * Return counter values from counter(9)s stored in ifnet. 1719 */ 1720 uint64_t 1721 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1722 { 1723 1724 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1725 1726 return (counter_u64_fetch(ifp->if_counters[cnt])); 1727 } 1728 1729 /* 1730 * Increase an ifnet counter. Usually used for counters shared 1731 * between the stack and a driver, but function supports them all. 1732 */ 1733 void 1734 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1735 { 1736 1737 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1738 1739 counter_u64_add(ifp->if_counters[cnt], inc); 1740 } 1741 1742 /* 1743 * Copy data from ifnet to userland API structure if_data. 1744 */ 1745 void 1746 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1747 { 1748 1749 ifd->ifi_type = ifp->if_type; 1750 ifd->ifi_physical = 0; 1751 ifd->ifi_addrlen = ifp->if_addrlen; 1752 ifd->ifi_hdrlen = ifp->if_hdrlen; 1753 ifd->ifi_link_state = ifp->if_link_state; 1754 ifd->ifi_vhid = 0; 1755 ifd->ifi_datalen = sizeof(struct if_data); 1756 ifd->ifi_mtu = ifp->if_mtu; 1757 ifd->ifi_metric = ifp->if_metric; 1758 ifd->ifi_baudrate = ifp->if_baudrate; 1759 ifd->ifi_hwassist = ifp->if_hwassist; 1760 ifd->ifi_epoch = ifp->if_epoch; 1761 ifd->ifi_lastchange = ifp->if_lastchange; 1762 1763 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1764 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1765 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1766 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1767 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1768 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1769 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1770 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1771 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1772 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1773 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1774 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1775 } 1776 1777 /* 1778 * Initialization, destruction and refcounting functions for ifaddrs. 1779 */ 1780 struct ifaddr * 1781 ifa_alloc(size_t size, int flags) 1782 { 1783 struct ifaddr *ifa; 1784 1785 KASSERT(size >= sizeof(struct ifaddr), 1786 ("%s: invalid size %zu", __func__, size)); 1787 1788 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1789 if (ifa == NULL) 1790 return (NULL); 1791 1792 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1793 goto fail; 1794 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1795 goto fail; 1796 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1797 goto fail; 1798 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1799 goto fail; 1800 1801 refcount_init(&ifa->ifa_refcnt, 1); 1802 1803 return (ifa); 1804 1805 fail: 1806 /* free(NULL) is okay */ 1807 counter_u64_free(ifa->ifa_opackets); 1808 counter_u64_free(ifa->ifa_ipackets); 1809 counter_u64_free(ifa->ifa_obytes); 1810 counter_u64_free(ifa->ifa_ibytes); 1811 free(ifa, M_IFADDR); 1812 1813 return (NULL); 1814 } 1815 1816 void 1817 ifa_ref(struct ifaddr *ifa) 1818 { 1819 1820 refcount_acquire(&ifa->ifa_refcnt); 1821 } 1822 1823 static void 1824 ifa_destroy(epoch_context_t ctx) 1825 { 1826 struct ifaddr *ifa; 1827 1828 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1829 counter_u64_free(ifa->ifa_opackets); 1830 counter_u64_free(ifa->ifa_ipackets); 1831 counter_u64_free(ifa->ifa_obytes); 1832 counter_u64_free(ifa->ifa_ibytes); 1833 free(ifa, M_IFADDR); 1834 } 1835 1836 void 1837 ifa_free(struct ifaddr *ifa) 1838 { 1839 1840 if (refcount_release(&ifa->ifa_refcnt)) 1841 NET_EPOCH_CALL(ifa_destroy, &ifa->ifa_epoch_ctx); 1842 } 1843 1844 1845 static int 1846 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1847 struct sockaddr *ia) 1848 { 1849 struct rib_cmd_info rc; 1850 struct epoch_tracker et; 1851 int error; 1852 struct rt_addrinfo info; 1853 struct sockaddr_dl null_sdl; 1854 struct ifnet *ifp; 1855 struct ifaddr *rti_ifa = NULL; 1856 1857 ifp = ifa->ifa_ifp; 1858 1859 NET_EPOCH_ENTER(et); 1860 bzero(&info, sizeof(info)); 1861 if (cmd != RTM_DELETE) 1862 info.rti_ifp = V_loif; 1863 if (cmd == RTM_ADD) { 1864 /* explicitly specify (loopback) ifa */ 1865 if (info.rti_ifp != NULL) { 1866 rti_ifa = ifaof_ifpforaddr(ifa->ifa_addr, info.rti_ifp); 1867 if (rti_ifa != NULL) 1868 ifa_ref(rti_ifa); 1869 info.rti_ifa = rti_ifa; 1870 } 1871 } 1872 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1873 info.rti_info[RTAX_DST] = ia; 1874 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1875 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1876 1877 error = rib_action(ifp->if_fib, cmd, &info, &rc); 1878 NET_EPOCH_EXIT(et); 1879 1880 if (rti_ifa != NULL) 1881 ifa_free(rti_ifa); 1882 1883 if (error == 0 || 1884 (cmd == RTM_ADD && error == EEXIST) || 1885 (cmd == RTM_DELETE && (error == ENOENT || error == ESRCH))) 1886 return (error); 1887 1888 log(LOG_DEBUG, "%s: %s failed for interface %s: %u\n", 1889 __func__, otype, if_name(ifp), error); 1890 1891 return (error); 1892 } 1893 1894 int 1895 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1896 { 1897 1898 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1899 } 1900 1901 int 1902 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1903 { 1904 1905 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1906 } 1907 1908 int 1909 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1910 { 1911 1912 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1913 } 1914 1915 /* 1916 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1917 * structs used to represent other address families, it is necessary 1918 * to perform a different comparison. 1919 */ 1920 1921 #define sa_dl_equal(a1, a2) \ 1922 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1923 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1924 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1925 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1926 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1927 1928 /* 1929 * Locate an interface based on a complete address. 1930 */ 1931 /*ARGSUSED*/ 1932 struct ifaddr * 1933 ifa_ifwithaddr(const struct sockaddr *addr) 1934 { 1935 struct ifnet *ifp; 1936 struct ifaddr *ifa; 1937 1938 NET_EPOCH_ASSERT(); 1939 1940 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1941 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1942 if (ifa->ifa_addr->sa_family != addr->sa_family) 1943 continue; 1944 if (sa_equal(addr, ifa->ifa_addr)) { 1945 goto done; 1946 } 1947 /* IP6 doesn't have broadcast */ 1948 if ((ifp->if_flags & IFF_BROADCAST) && 1949 ifa->ifa_broadaddr && 1950 ifa->ifa_broadaddr->sa_len != 0 && 1951 sa_equal(ifa->ifa_broadaddr, addr)) { 1952 goto done; 1953 } 1954 } 1955 } 1956 ifa = NULL; 1957 done: 1958 return (ifa); 1959 } 1960 1961 int 1962 ifa_ifwithaddr_check(const struct sockaddr *addr) 1963 { 1964 struct epoch_tracker et; 1965 int rc; 1966 1967 NET_EPOCH_ENTER(et); 1968 rc = (ifa_ifwithaddr(addr) != NULL); 1969 NET_EPOCH_EXIT(et); 1970 return (rc); 1971 } 1972 1973 /* 1974 * Locate an interface based on the broadcast address. 1975 */ 1976 /* ARGSUSED */ 1977 struct ifaddr * 1978 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1979 { 1980 struct ifnet *ifp; 1981 struct ifaddr *ifa; 1982 1983 NET_EPOCH_ASSERT(); 1984 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1985 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1986 continue; 1987 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1988 if (ifa->ifa_addr->sa_family != addr->sa_family) 1989 continue; 1990 if ((ifp->if_flags & IFF_BROADCAST) && 1991 ifa->ifa_broadaddr && 1992 ifa->ifa_broadaddr->sa_len != 0 && 1993 sa_equal(ifa->ifa_broadaddr, addr)) { 1994 goto done; 1995 } 1996 } 1997 } 1998 ifa = NULL; 1999 done: 2000 return (ifa); 2001 } 2002 2003 /* 2004 * Locate the point to point interface with a given destination address. 2005 */ 2006 /*ARGSUSED*/ 2007 struct ifaddr * 2008 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 2009 { 2010 struct ifnet *ifp; 2011 struct ifaddr *ifa; 2012 2013 NET_EPOCH_ASSERT(); 2014 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2015 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 2016 continue; 2017 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2018 continue; 2019 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2020 if (ifa->ifa_addr->sa_family != addr->sa_family) 2021 continue; 2022 if (ifa->ifa_dstaddr != NULL && 2023 sa_equal(addr, ifa->ifa_dstaddr)) { 2024 goto done; 2025 } 2026 } 2027 } 2028 ifa = NULL; 2029 done: 2030 return (ifa); 2031 } 2032 2033 /* 2034 * Find an interface on a specific network. If many, choice 2035 * is most specific found. 2036 */ 2037 struct ifaddr * 2038 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2039 { 2040 struct ifnet *ifp; 2041 struct ifaddr *ifa; 2042 struct ifaddr *ifa_maybe = NULL; 2043 u_int af = addr->sa_family; 2044 const char *addr_data = addr->sa_data, *cplim; 2045 2046 NET_EPOCH_ASSERT(); 2047 /* 2048 * AF_LINK addresses can be looked up directly by their index number, 2049 * so do that if we can. 2050 */ 2051 if (af == AF_LINK) { 2052 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2053 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2054 return (ifaddr_byindex(sdl->sdl_index)); 2055 } 2056 2057 /* 2058 * Scan though each interface, looking for ones that have addresses 2059 * in this address family and the requested fib. 2060 */ 2061 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2062 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2063 continue; 2064 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2065 const char *cp, *cp2, *cp3; 2066 2067 if (ifa->ifa_addr->sa_family != af) 2068 next: continue; 2069 if (af == AF_INET && 2070 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2071 /* 2072 * This is a bit broken as it doesn't 2073 * take into account that the remote end may 2074 * be a single node in the network we are 2075 * looking for. 2076 * The trouble is that we don't know the 2077 * netmask for the remote end. 2078 */ 2079 if (ifa->ifa_dstaddr != NULL && 2080 sa_equal(addr, ifa->ifa_dstaddr)) { 2081 goto done; 2082 } 2083 } else { 2084 /* 2085 * Scan all the bits in the ifa's address. 2086 * If a bit dissagrees with what we are 2087 * looking for, mask it with the netmask 2088 * to see if it really matters. 2089 * (A byte at a time) 2090 */ 2091 if (ifa->ifa_netmask == 0) 2092 continue; 2093 cp = addr_data; 2094 cp2 = ifa->ifa_addr->sa_data; 2095 cp3 = ifa->ifa_netmask->sa_data; 2096 cplim = ifa->ifa_netmask->sa_len 2097 + (char *)ifa->ifa_netmask; 2098 while (cp3 < cplim) 2099 if ((*cp++ ^ *cp2++) & *cp3++) 2100 goto next; /* next address! */ 2101 /* 2102 * If the netmask of what we just found 2103 * is more specific than what we had before 2104 * (if we had one), or if the virtual status 2105 * of new prefix is better than of the old one, 2106 * then remember the new one before continuing 2107 * to search for an even better one. 2108 */ 2109 if (ifa_maybe == NULL || 2110 ifa_preferred(ifa_maybe, ifa) || 2111 rn_refines((caddr_t)ifa->ifa_netmask, 2112 (caddr_t)ifa_maybe->ifa_netmask)) { 2113 ifa_maybe = ifa; 2114 } 2115 } 2116 } 2117 } 2118 ifa = ifa_maybe; 2119 ifa_maybe = NULL; 2120 done: 2121 return (ifa); 2122 } 2123 2124 /* 2125 * Find an interface address specific to an interface best matching 2126 * a given address. 2127 */ 2128 struct ifaddr * 2129 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 2130 { 2131 struct ifaddr *ifa; 2132 const char *cp, *cp2, *cp3; 2133 char *cplim; 2134 struct ifaddr *ifa_maybe = NULL; 2135 u_int af = addr->sa_family; 2136 2137 if (af >= AF_MAX) 2138 return (NULL); 2139 2140 NET_EPOCH_ASSERT(); 2141 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2142 if (ifa->ifa_addr->sa_family != af) 2143 continue; 2144 if (ifa_maybe == NULL) 2145 ifa_maybe = ifa; 2146 if (ifa->ifa_netmask == 0) { 2147 if (sa_equal(addr, ifa->ifa_addr) || 2148 (ifa->ifa_dstaddr && 2149 sa_equal(addr, ifa->ifa_dstaddr))) 2150 goto done; 2151 continue; 2152 } 2153 if (ifp->if_flags & IFF_POINTOPOINT) { 2154 if (sa_equal(addr, ifa->ifa_dstaddr)) 2155 goto done; 2156 } else { 2157 cp = addr->sa_data; 2158 cp2 = ifa->ifa_addr->sa_data; 2159 cp3 = ifa->ifa_netmask->sa_data; 2160 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2161 for (; cp3 < cplim; cp3++) 2162 if ((*cp++ ^ *cp2++) & *cp3) 2163 break; 2164 if (cp3 == cplim) 2165 goto done; 2166 } 2167 } 2168 ifa = ifa_maybe; 2169 done: 2170 return (ifa); 2171 } 2172 2173 /* 2174 * See whether new ifa is better than current one: 2175 * 1) A non-virtual one is preferred over virtual. 2176 * 2) A virtual in master state preferred over any other state. 2177 * 2178 * Used in several address selecting functions. 2179 */ 2180 int 2181 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2182 { 2183 2184 return (cur->ifa_carp && (!next->ifa_carp || 2185 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2186 } 2187 2188 struct sockaddr_dl * 2189 link_alloc_sdl(size_t size, int flags) 2190 { 2191 2192 return (malloc(size, M_TEMP, flags)); 2193 } 2194 2195 void 2196 link_free_sdl(struct sockaddr *sa) 2197 { 2198 free(sa, M_TEMP); 2199 } 2200 2201 /* 2202 * Fills in given sdl with interface basic info. 2203 * Returns pointer to filled sdl. 2204 */ 2205 struct sockaddr_dl * 2206 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2207 { 2208 struct sockaddr_dl *sdl; 2209 2210 sdl = (struct sockaddr_dl *)paddr; 2211 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2212 sdl->sdl_len = sizeof(struct sockaddr_dl); 2213 sdl->sdl_family = AF_LINK; 2214 sdl->sdl_index = ifp->if_index; 2215 sdl->sdl_type = iftype; 2216 2217 return (sdl); 2218 } 2219 2220 /* 2221 * Mark an interface down and notify protocols of 2222 * the transition. 2223 */ 2224 static void 2225 if_unroute(struct ifnet *ifp, int flag, int fam) 2226 { 2227 struct ifaddr *ifa; 2228 2229 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2230 2231 ifp->if_flags &= ~flag; 2232 getmicrotime(&ifp->if_lastchange); 2233 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2234 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2235 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2236 ifp->if_qflush(ifp); 2237 2238 if (ifp->if_carp) 2239 (*carp_linkstate_p)(ifp); 2240 rt_ifmsg(ifp); 2241 } 2242 2243 /* 2244 * Mark an interface up and notify protocols of 2245 * the transition. 2246 */ 2247 static void 2248 if_route(struct ifnet *ifp, int flag, int fam) 2249 { 2250 struct ifaddr *ifa; 2251 2252 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2253 2254 ifp->if_flags |= flag; 2255 getmicrotime(&ifp->if_lastchange); 2256 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2257 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2258 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2259 if (ifp->if_carp) 2260 (*carp_linkstate_p)(ifp); 2261 rt_ifmsg(ifp); 2262 #ifdef INET6 2263 in6_if_up(ifp); 2264 #endif 2265 } 2266 2267 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2268 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2269 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2270 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2271 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2272 int (*vlan_pcp_p)(struct ifnet *, uint16_t *); 2273 int (*vlan_setcookie_p)(struct ifnet *, void *); 2274 void *(*vlan_cookie_p)(struct ifnet *); 2275 2276 /* 2277 * Handle a change in the interface link state. To avoid LORs 2278 * between driver lock and upper layer locks, as well as possible 2279 * recursions, we post event to taskqueue, and all job 2280 * is done in static do_link_state_change(). 2281 */ 2282 void 2283 if_link_state_change(struct ifnet *ifp, int link_state) 2284 { 2285 /* Return if state hasn't changed. */ 2286 if (ifp->if_link_state == link_state) 2287 return; 2288 2289 ifp->if_link_state = link_state; 2290 2291 /* XXXGL: reference ifp? */ 2292 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2293 } 2294 2295 static void 2296 do_link_state_change(void *arg, int pending) 2297 { 2298 struct ifnet *ifp; 2299 int link_state; 2300 2301 ifp = arg; 2302 link_state = ifp->if_link_state; 2303 2304 CURVNET_SET(ifp->if_vnet); 2305 rt_ifmsg(ifp); 2306 if (ifp->if_vlantrunk != NULL) 2307 (*vlan_link_state_p)(ifp); 2308 2309 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2310 ifp->if_l2com != NULL) 2311 (*ng_ether_link_state_p)(ifp, link_state); 2312 if (ifp->if_carp) 2313 (*carp_linkstate_p)(ifp); 2314 if (ifp->if_bridge) 2315 ifp->if_bridge_linkstate(ifp); 2316 if (ifp->if_lagg) 2317 (*lagg_linkstate_p)(ifp, link_state); 2318 2319 if (IS_DEFAULT_VNET(curvnet)) 2320 devctl_notify("IFNET", ifp->if_xname, 2321 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2322 NULL); 2323 if (pending > 1) 2324 if_printf(ifp, "%d link states coalesced\n", pending); 2325 if (log_link_state_change) 2326 if_printf(ifp, "link state changed to %s\n", 2327 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2328 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2329 CURVNET_RESTORE(); 2330 } 2331 2332 /* 2333 * Mark an interface down and notify protocols of 2334 * the transition. 2335 */ 2336 void 2337 if_down(struct ifnet *ifp) 2338 { 2339 2340 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2341 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2342 } 2343 2344 /* 2345 * Mark an interface up and notify protocols of 2346 * the transition. 2347 */ 2348 void 2349 if_up(struct ifnet *ifp) 2350 { 2351 2352 if_route(ifp, IFF_UP, AF_UNSPEC); 2353 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2354 } 2355 2356 /* 2357 * Flush an interface queue. 2358 */ 2359 void 2360 if_qflush(struct ifnet *ifp) 2361 { 2362 struct mbuf *m, *n; 2363 struct ifaltq *ifq; 2364 2365 ifq = &ifp->if_snd; 2366 IFQ_LOCK(ifq); 2367 #ifdef ALTQ 2368 if (ALTQ_IS_ENABLED(ifq)) 2369 ALTQ_PURGE(ifq); 2370 #endif 2371 n = ifq->ifq_head; 2372 while ((m = n) != NULL) { 2373 n = m->m_nextpkt; 2374 m_freem(m); 2375 } 2376 ifq->ifq_head = 0; 2377 ifq->ifq_tail = 0; 2378 ifq->ifq_len = 0; 2379 IFQ_UNLOCK(ifq); 2380 } 2381 2382 /* 2383 * Map interface name to interface structure pointer, with or without 2384 * returning a reference. 2385 */ 2386 struct ifnet * 2387 ifunit_ref(const char *name) 2388 { 2389 struct epoch_tracker et; 2390 struct ifnet *ifp; 2391 2392 NET_EPOCH_ENTER(et); 2393 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2394 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2395 !(ifp->if_flags & IFF_DYING)) 2396 break; 2397 } 2398 if (ifp != NULL) 2399 if_ref(ifp); 2400 NET_EPOCH_EXIT(et); 2401 return (ifp); 2402 } 2403 2404 struct ifnet * 2405 ifunit(const char *name) 2406 { 2407 struct epoch_tracker et; 2408 struct ifnet *ifp; 2409 2410 NET_EPOCH_ENTER(et); 2411 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2412 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2413 break; 2414 } 2415 NET_EPOCH_EXIT(et); 2416 return (ifp); 2417 } 2418 2419 void * 2420 ifr_buffer_get_buffer(void *data) 2421 { 2422 union ifreq_union *ifrup; 2423 2424 ifrup = data; 2425 #ifdef COMPAT_FREEBSD32 2426 if (SV_CURPROC_FLAG(SV_ILP32)) 2427 return ((void *)(uintptr_t) 2428 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2429 #endif 2430 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2431 } 2432 2433 static void 2434 ifr_buffer_set_buffer_null(void *data) 2435 { 2436 union ifreq_union *ifrup; 2437 2438 ifrup = data; 2439 #ifdef COMPAT_FREEBSD32 2440 if (SV_CURPROC_FLAG(SV_ILP32)) 2441 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2442 else 2443 #endif 2444 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2445 } 2446 2447 size_t 2448 ifr_buffer_get_length(void *data) 2449 { 2450 union ifreq_union *ifrup; 2451 2452 ifrup = data; 2453 #ifdef COMPAT_FREEBSD32 2454 if (SV_CURPROC_FLAG(SV_ILP32)) 2455 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2456 #endif 2457 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2458 } 2459 2460 static void 2461 ifr_buffer_set_length(void *data, size_t len) 2462 { 2463 union ifreq_union *ifrup; 2464 2465 ifrup = data; 2466 #ifdef COMPAT_FREEBSD32 2467 if (SV_CURPROC_FLAG(SV_ILP32)) 2468 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2469 else 2470 #endif 2471 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2472 } 2473 2474 void * 2475 ifr_data_get_ptr(void *ifrp) 2476 { 2477 union ifreq_union *ifrup; 2478 2479 ifrup = ifrp; 2480 #ifdef COMPAT_FREEBSD32 2481 if (SV_CURPROC_FLAG(SV_ILP32)) 2482 return ((void *)(uintptr_t) 2483 ifrup->ifr32.ifr_ifru.ifru_data); 2484 #endif 2485 return (ifrup->ifr.ifr_ifru.ifru_data); 2486 } 2487 2488 /* 2489 * Hardware specific interface ioctls. 2490 */ 2491 int 2492 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2493 { 2494 struct ifreq *ifr; 2495 int error = 0, do_ifup = 0; 2496 int new_flags, temp_flags; 2497 size_t namelen, onamelen; 2498 size_t descrlen; 2499 char *descrbuf, *odescrbuf; 2500 char new_name[IFNAMSIZ]; 2501 struct ifaddr *ifa; 2502 struct sockaddr_dl *sdl; 2503 2504 ifr = (struct ifreq *)data; 2505 switch (cmd) { 2506 case SIOCGIFINDEX: 2507 ifr->ifr_index = ifp->if_index; 2508 break; 2509 2510 case SIOCGIFFLAGS: 2511 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2512 ifr->ifr_flags = temp_flags & 0xffff; 2513 ifr->ifr_flagshigh = temp_flags >> 16; 2514 break; 2515 2516 case SIOCGIFCAP: 2517 ifr->ifr_reqcap = ifp->if_capabilities; 2518 ifr->ifr_curcap = ifp->if_capenable; 2519 break; 2520 2521 #ifdef MAC 2522 case SIOCGIFMAC: 2523 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2524 break; 2525 #endif 2526 2527 case SIOCGIFMETRIC: 2528 ifr->ifr_metric = ifp->if_metric; 2529 break; 2530 2531 case SIOCGIFMTU: 2532 ifr->ifr_mtu = ifp->if_mtu; 2533 break; 2534 2535 case SIOCGIFPHYS: 2536 /* XXXGL: did this ever worked? */ 2537 ifr->ifr_phys = 0; 2538 break; 2539 2540 case SIOCGIFDESCR: 2541 error = 0; 2542 sx_slock(&ifdescr_sx); 2543 if (ifp->if_description == NULL) 2544 error = ENOMSG; 2545 else { 2546 /* space for terminating nul */ 2547 descrlen = strlen(ifp->if_description) + 1; 2548 if (ifr_buffer_get_length(ifr) < descrlen) 2549 ifr_buffer_set_buffer_null(ifr); 2550 else 2551 error = copyout(ifp->if_description, 2552 ifr_buffer_get_buffer(ifr), descrlen); 2553 ifr_buffer_set_length(ifr, descrlen); 2554 } 2555 sx_sunlock(&ifdescr_sx); 2556 break; 2557 2558 case SIOCSIFDESCR: 2559 error = priv_check(td, PRIV_NET_SETIFDESCR); 2560 if (error) 2561 return (error); 2562 2563 /* 2564 * Copy only (length-1) bytes to make sure that 2565 * if_description is always nul terminated. The 2566 * length parameter is supposed to count the 2567 * terminating nul in. 2568 */ 2569 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2570 return (ENAMETOOLONG); 2571 else if (ifr_buffer_get_length(ifr) == 0) 2572 descrbuf = NULL; 2573 else { 2574 descrbuf = malloc(ifr_buffer_get_length(ifr), 2575 M_IFDESCR, M_WAITOK | M_ZERO); 2576 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2577 ifr_buffer_get_length(ifr) - 1); 2578 if (error) { 2579 free(descrbuf, M_IFDESCR); 2580 break; 2581 } 2582 } 2583 2584 sx_xlock(&ifdescr_sx); 2585 odescrbuf = ifp->if_description; 2586 ifp->if_description = descrbuf; 2587 sx_xunlock(&ifdescr_sx); 2588 2589 getmicrotime(&ifp->if_lastchange); 2590 free(odescrbuf, M_IFDESCR); 2591 break; 2592 2593 case SIOCGIFFIB: 2594 ifr->ifr_fib = ifp->if_fib; 2595 break; 2596 2597 case SIOCSIFFIB: 2598 error = priv_check(td, PRIV_NET_SETIFFIB); 2599 if (error) 2600 return (error); 2601 if (ifr->ifr_fib >= rt_numfibs) 2602 return (EINVAL); 2603 2604 ifp->if_fib = ifr->ifr_fib; 2605 break; 2606 2607 case SIOCSIFFLAGS: 2608 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2609 if (error) 2610 return (error); 2611 /* 2612 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2613 * check, so we don't need special handling here yet. 2614 */ 2615 new_flags = (ifr->ifr_flags & 0xffff) | 2616 (ifr->ifr_flagshigh << 16); 2617 if (ifp->if_flags & IFF_UP && 2618 (new_flags & IFF_UP) == 0) { 2619 if_down(ifp); 2620 } else if (new_flags & IFF_UP && 2621 (ifp->if_flags & IFF_UP) == 0) { 2622 do_ifup = 1; 2623 } 2624 /* See if permanently promiscuous mode bit is about to flip */ 2625 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2626 if (new_flags & IFF_PPROMISC) 2627 ifp->if_flags |= IFF_PROMISC; 2628 else if (ifp->if_pcount == 0) 2629 ifp->if_flags &= ~IFF_PROMISC; 2630 if (log_promisc_mode_change) 2631 if_printf(ifp, "permanently promiscuous mode %s\n", 2632 ((new_flags & IFF_PPROMISC) ? 2633 "enabled" : "disabled")); 2634 } 2635 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2636 (new_flags &~ IFF_CANTCHANGE); 2637 if (ifp->if_ioctl) { 2638 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2639 } 2640 if (do_ifup) 2641 if_up(ifp); 2642 getmicrotime(&ifp->if_lastchange); 2643 break; 2644 2645 case SIOCSIFCAP: 2646 error = priv_check(td, PRIV_NET_SETIFCAP); 2647 if (error) 2648 return (error); 2649 if (ifp->if_ioctl == NULL) 2650 return (EOPNOTSUPP); 2651 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2652 return (EINVAL); 2653 error = (*ifp->if_ioctl)(ifp, cmd, data); 2654 if (error == 0) 2655 getmicrotime(&ifp->if_lastchange); 2656 break; 2657 2658 #ifdef MAC 2659 case SIOCSIFMAC: 2660 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2661 break; 2662 #endif 2663 2664 case SIOCSIFNAME: 2665 error = priv_check(td, PRIV_NET_SETIFNAME); 2666 if (error) 2667 return (error); 2668 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2669 NULL); 2670 if (error != 0) 2671 return (error); 2672 if (new_name[0] == '\0') 2673 return (EINVAL); 2674 if (new_name[IFNAMSIZ-1] != '\0') { 2675 new_name[IFNAMSIZ-1] = '\0'; 2676 if (strlen(new_name) == IFNAMSIZ-1) 2677 return (EINVAL); 2678 } 2679 if (strcmp(new_name, ifp->if_xname) == 0) 2680 break; 2681 if (ifunit(new_name) != NULL) 2682 return (EEXIST); 2683 2684 /* 2685 * XXX: Locking. Nothing else seems to lock if_flags, 2686 * and there are numerous other races with the 2687 * ifunit() checks not being atomic with namespace 2688 * changes (renames, vmoves, if_attach, etc). 2689 */ 2690 ifp->if_flags |= IFF_RENAMING; 2691 2692 /* Announce the departure of the interface. */ 2693 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2694 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2695 2696 if_printf(ifp, "changing name to '%s'\n", new_name); 2697 2698 IF_ADDR_WLOCK(ifp); 2699 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2700 ifa = ifp->if_addr; 2701 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2702 namelen = strlen(new_name); 2703 onamelen = sdl->sdl_nlen; 2704 /* 2705 * Move the address if needed. This is safe because we 2706 * allocate space for a name of length IFNAMSIZ when we 2707 * create this in if_attach(). 2708 */ 2709 if (namelen != onamelen) { 2710 bcopy(sdl->sdl_data + onamelen, 2711 sdl->sdl_data + namelen, sdl->sdl_alen); 2712 } 2713 bcopy(new_name, sdl->sdl_data, namelen); 2714 sdl->sdl_nlen = namelen; 2715 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2716 bzero(sdl->sdl_data, onamelen); 2717 while (namelen != 0) 2718 sdl->sdl_data[--namelen] = 0xff; 2719 IF_ADDR_WUNLOCK(ifp); 2720 2721 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2722 /* Announce the return of the interface. */ 2723 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2724 2725 ifp->if_flags &= ~IFF_RENAMING; 2726 break; 2727 2728 #ifdef VIMAGE 2729 case SIOCSIFVNET: 2730 error = priv_check(td, PRIV_NET_SETIFVNET); 2731 if (error) 2732 return (error); 2733 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2734 break; 2735 #endif 2736 2737 case SIOCSIFMETRIC: 2738 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2739 if (error) 2740 return (error); 2741 ifp->if_metric = ifr->ifr_metric; 2742 getmicrotime(&ifp->if_lastchange); 2743 break; 2744 2745 case SIOCSIFPHYS: 2746 error = priv_check(td, PRIV_NET_SETIFPHYS); 2747 if (error) 2748 return (error); 2749 if (ifp->if_ioctl == NULL) 2750 return (EOPNOTSUPP); 2751 error = (*ifp->if_ioctl)(ifp, cmd, data); 2752 if (error == 0) 2753 getmicrotime(&ifp->if_lastchange); 2754 break; 2755 2756 case SIOCSIFMTU: 2757 { 2758 u_long oldmtu = ifp->if_mtu; 2759 2760 error = priv_check(td, PRIV_NET_SETIFMTU); 2761 if (error) 2762 return (error); 2763 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2764 return (EINVAL); 2765 if (ifp->if_ioctl == NULL) 2766 return (EOPNOTSUPP); 2767 error = (*ifp->if_ioctl)(ifp, cmd, data); 2768 if (error == 0) { 2769 getmicrotime(&ifp->if_lastchange); 2770 rt_ifmsg(ifp); 2771 #ifdef INET 2772 DEBUGNET_NOTIFY_MTU(ifp); 2773 #endif 2774 } 2775 /* 2776 * If the link MTU changed, do network layer specific procedure. 2777 */ 2778 if (ifp->if_mtu != oldmtu) { 2779 #ifdef INET6 2780 nd6_setmtu(ifp); 2781 #endif 2782 rt_updatemtu(ifp); 2783 } 2784 break; 2785 } 2786 2787 case SIOCADDMULTI: 2788 case SIOCDELMULTI: 2789 if (cmd == SIOCADDMULTI) 2790 error = priv_check(td, PRIV_NET_ADDMULTI); 2791 else 2792 error = priv_check(td, PRIV_NET_DELMULTI); 2793 if (error) 2794 return (error); 2795 2796 /* Don't allow group membership on non-multicast interfaces. */ 2797 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2798 return (EOPNOTSUPP); 2799 2800 /* Don't let users screw up protocols' entries. */ 2801 if (ifr->ifr_addr.sa_family != AF_LINK) 2802 return (EINVAL); 2803 2804 if (cmd == SIOCADDMULTI) { 2805 struct epoch_tracker et; 2806 struct ifmultiaddr *ifma; 2807 2808 /* 2809 * Userland is only permitted to join groups once 2810 * via the if_addmulti() KPI, because it cannot hold 2811 * struct ifmultiaddr * between calls. It may also 2812 * lose a race while we check if the membership 2813 * already exists. 2814 */ 2815 NET_EPOCH_ENTER(et); 2816 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2817 NET_EPOCH_EXIT(et); 2818 if (ifma != NULL) 2819 error = EADDRINUSE; 2820 else 2821 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2822 } else { 2823 error = if_delmulti(ifp, &ifr->ifr_addr); 2824 } 2825 if (error == 0) 2826 getmicrotime(&ifp->if_lastchange); 2827 break; 2828 2829 case SIOCSIFPHYADDR: 2830 case SIOCDIFPHYADDR: 2831 #ifdef INET6 2832 case SIOCSIFPHYADDR_IN6: 2833 #endif 2834 case SIOCSIFMEDIA: 2835 case SIOCSIFGENERIC: 2836 error = priv_check(td, PRIV_NET_HWIOCTL); 2837 if (error) 2838 return (error); 2839 if (ifp->if_ioctl == NULL) 2840 return (EOPNOTSUPP); 2841 error = (*ifp->if_ioctl)(ifp, cmd, data); 2842 if (error == 0) 2843 getmicrotime(&ifp->if_lastchange); 2844 break; 2845 2846 case SIOCGIFSTATUS: 2847 case SIOCGIFPSRCADDR: 2848 case SIOCGIFPDSTADDR: 2849 case SIOCGIFMEDIA: 2850 case SIOCGIFXMEDIA: 2851 case SIOCGIFGENERIC: 2852 case SIOCGIFRSSKEY: 2853 case SIOCGIFRSSHASH: 2854 case SIOCGIFDOWNREASON: 2855 if (ifp->if_ioctl == NULL) 2856 return (EOPNOTSUPP); 2857 error = (*ifp->if_ioctl)(ifp, cmd, data); 2858 break; 2859 2860 case SIOCSIFLLADDR: 2861 error = priv_check(td, PRIV_NET_SETLLADDR); 2862 if (error) 2863 return (error); 2864 error = if_setlladdr(ifp, 2865 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2866 break; 2867 2868 case SIOCGHWADDR: 2869 error = if_gethwaddr(ifp, ifr); 2870 break; 2871 2872 case CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2873 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2874 if (error) 2875 return (error); 2876 if ((error = if_addgroup(ifp, 2877 ifgr_group_get((struct ifgroupreq *)data)))) 2878 return (error); 2879 break; 2880 2881 case CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2882 { 2883 struct epoch_tracker et; 2884 2885 NET_EPOCH_ENTER(et); 2886 error = if_getgroup((struct ifgroupreq *)data, ifp); 2887 NET_EPOCH_EXIT(et); 2888 break; 2889 } 2890 2891 case CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2892 error = priv_check(td, PRIV_NET_DELIFGROUP); 2893 if (error) 2894 return (error); 2895 if ((error = if_delgroup(ifp, 2896 ifgr_group_get((struct ifgroupreq *)data)))) 2897 return (error); 2898 break; 2899 2900 default: 2901 error = ENOIOCTL; 2902 break; 2903 } 2904 return (error); 2905 } 2906 2907 #ifdef COMPAT_FREEBSD32 2908 struct ifconf32 { 2909 int32_t ifc_len; 2910 union { 2911 uint32_t ifcu_buf; 2912 uint32_t ifcu_req; 2913 } ifc_ifcu; 2914 }; 2915 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2916 #endif 2917 2918 #ifdef COMPAT_FREEBSD32 2919 static void 2920 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2921 { 2922 struct ifmediareq32 *ifmr32; 2923 2924 ifmr32 = (struct ifmediareq32 *)data; 2925 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2926 sizeof(ifmr->ifm_name)); 2927 ifmr->ifm_current = ifmr32->ifm_current; 2928 ifmr->ifm_mask = ifmr32->ifm_mask; 2929 ifmr->ifm_status = ifmr32->ifm_status; 2930 ifmr->ifm_active = ifmr32->ifm_active; 2931 ifmr->ifm_count = ifmr32->ifm_count; 2932 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2933 } 2934 2935 static void 2936 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2937 { 2938 struct ifmediareq32 *ifmr32; 2939 2940 ifmr32 = (struct ifmediareq32 *)data; 2941 ifmr32->ifm_current = ifmr->ifm_current; 2942 ifmr32->ifm_mask = ifmr->ifm_mask; 2943 ifmr32->ifm_status = ifmr->ifm_status; 2944 ifmr32->ifm_active = ifmr->ifm_active; 2945 ifmr32->ifm_count = ifmr->ifm_count; 2946 } 2947 #endif 2948 2949 /* 2950 * Interface ioctls. 2951 */ 2952 int 2953 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2954 { 2955 #ifdef COMPAT_FREEBSD32 2956 caddr_t saved_data = NULL; 2957 struct ifmediareq ifmr; 2958 struct ifmediareq *ifmrp = NULL; 2959 #endif 2960 struct ifnet *ifp; 2961 struct ifreq *ifr; 2962 int error; 2963 int oif_flags; 2964 #ifdef VIMAGE 2965 bool shutdown; 2966 #endif 2967 2968 CURVNET_SET(so->so_vnet); 2969 #ifdef VIMAGE 2970 /* Make sure the VNET is stable. */ 2971 shutdown = VNET_IS_SHUTTING_DOWN(so->so_vnet); 2972 if (shutdown) { 2973 CURVNET_RESTORE(); 2974 return (EBUSY); 2975 } 2976 #endif 2977 2978 switch (cmd) { 2979 case SIOCGIFCONF: 2980 error = ifconf(cmd, data); 2981 goto out_noref; 2982 2983 #ifdef COMPAT_FREEBSD32 2984 case SIOCGIFCONF32: 2985 { 2986 struct ifconf32 *ifc32; 2987 struct ifconf ifc; 2988 2989 ifc32 = (struct ifconf32 *)data; 2990 ifc.ifc_len = ifc32->ifc_len; 2991 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2992 2993 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2994 if (error == 0) 2995 ifc32->ifc_len = ifc.ifc_len; 2996 goto out_noref; 2997 } 2998 #endif 2999 } 3000 3001 #ifdef COMPAT_FREEBSD32 3002 switch (cmd) { 3003 case SIOCGIFMEDIA32: 3004 case SIOCGIFXMEDIA32: 3005 ifmrp = &ifmr; 3006 ifmr_init(ifmrp, data); 3007 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3008 saved_data = data; 3009 data = (caddr_t)ifmrp; 3010 } 3011 #endif 3012 3013 ifr = (struct ifreq *)data; 3014 switch (cmd) { 3015 #ifdef VIMAGE 3016 case SIOCSIFRVNET: 3017 error = priv_check(td, PRIV_NET_SETIFVNET); 3018 if (error == 0) 3019 error = if_vmove_reclaim(td, ifr->ifr_name, 3020 ifr->ifr_jid); 3021 goto out_noref; 3022 #endif 3023 case SIOCIFCREATE: 3024 case SIOCIFCREATE2: 3025 error = priv_check(td, PRIV_NET_IFCREATE); 3026 if (error == 0) 3027 error = if_clone_create(ifr->ifr_name, 3028 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3029 ifr_data_get_ptr(ifr) : NULL); 3030 goto out_noref; 3031 case SIOCIFDESTROY: 3032 error = priv_check(td, PRIV_NET_IFDESTROY); 3033 if (error == 0) 3034 error = if_clone_destroy(ifr->ifr_name); 3035 goto out_noref; 3036 3037 case SIOCIFGCLONERS: 3038 error = if_clone_list((struct if_clonereq *)data); 3039 goto out_noref; 3040 3041 case CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3042 error = if_getgroupmembers((struct ifgroupreq *)data); 3043 goto out_noref; 3044 3045 #if defined(INET) || defined(INET6) 3046 case SIOCSVH: 3047 case SIOCGVH: 3048 if (carp_ioctl_p == NULL) 3049 error = EPROTONOSUPPORT; 3050 else 3051 error = (*carp_ioctl_p)(ifr, cmd, td); 3052 goto out_noref; 3053 #endif 3054 } 3055 3056 ifp = ifunit_ref(ifr->ifr_name); 3057 if (ifp == NULL) { 3058 error = ENXIO; 3059 goto out_noref; 3060 } 3061 3062 error = ifhwioctl(cmd, ifp, data, td); 3063 if (error != ENOIOCTL) 3064 goto out_ref; 3065 3066 oif_flags = ifp->if_flags; 3067 if (so->so_proto == NULL) { 3068 error = EOPNOTSUPP; 3069 goto out_ref; 3070 } 3071 3072 /* 3073 * Pass the request on to the socket control method, and if the 3074 * latter returns EOPNOTSUPP, directly to the interface. 3075 * 3076 * Make an exception for the legacy SIOCSIF* requests. Drivers 3077 * trust SIOCSIFADDR et al to come from an already privileged 3078 * layer, and do not perform any credentials checks or input 3079 * validation. 3080 */ 3081 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3082 ifp, td)); 3083 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3084 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3085 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3086 error = (*ifp->if_ioctl)(ifp, cmd, data); 3087 3088 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3089 #ifdef INET6 3090 if (ifp->if_flags & IFF_UP) 3091 in6_if_up(ifp); 3092 #endif 3093 } 3094 3095 out_ref: 3096 if_rele(ifp); 3097 out_noref: 3098 #ifdef COMPAT_FREEBSD32 3099 if (ifmrp != NULL) { 3100 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3101 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3102 cmd)); 3103 data = saved_data; 3104 ifmr_update(ifmrp, data); 3105 } 3106 #endif 3107 CURVNET_RESTORE(); 3108 return (error); 3109 } 3110 3111 /* 3112 * The code common to handling reference counted flags, 3113 * e.g., in ifpromisc() and if_allmulti(). 3114 * The "pflag" argument can specify a permanent mode flag to check, 3115 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3116 * 3117 * Only to be used on stack-owned flags, not driver-owned flags. 3118 */ 3119 static int 3120 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3121 { 3122 struct ifreq ifr; 3123 int error; 3124 int oldflags, oldcount; 3125 3126 /* Sanity checks to catch programming errors */ 3127 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3128 ("%s: setting driver-owned flag %d", __func__, flag)); 3129 3130 if (onswitch) 3131 KASSERT(*refcount >= 0, 3132 ("%s: increment negative refcount %d for flag %d", 3133 __func__, *refcount, flag)); 3134 else 3135 KASSERT(*refcount > 0, 3136 ("%s: decrement non-positive refcount %d for flag %d", 3137 __func__, *refcount, flag)); 3138 3139 /* In case this mode is permanent, just touch refcount */ 3140 if (ifp->if_flags & pflag) { 3141 *refcount += onswitch ? 1 : -1; 3142 return (0); 3143 } 3144 3145 /* Save ifnet parameters for if_ioctl() may fail */ 3146 oldcount = *refcount; 3147 oldflags = ifp->if_flags; 3148 3149 /* 3150 * See if we aren't the only and touching refcount is enough. 3151 * Actually toggle interface flag if we are the first or last. 3152 */ 3153 if (onswitch) { 3154 if ((*refcount)++) 3155 return (0); 3156 ifp->if_flags |= flag; 3157 } else { 3158 if (--(*refcount)) 3159 return (0); 3160 ifp->if_flags &= ~flag; 3161 } 3162 3163 /* Call down the driver since we've changed interface flags */ 3164 if (ifp->if_ioctl == NULL) { 3165 error = EOPNOTSUPP; 3166 goto recover; 3167 } 3168 ifr.ifr_flags = ifp->if_flags & 0xffff; 3169 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3170 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3171 if (error) 3172 goto recover; 3173 /* Notify userland that interface flags have changed */ 3174 rt_ifmsg(ifp); 3175 return (0); 3176 3177 recover: 3178 /* Recover after driver error */ 3179 *refcount = oldcount; 3180 ifp->if_flags = oldflags; 3181 return (error); 3182 } 3183 3184 /* 3185 * Set/clear promiscuous mode on interface ifp based on the truth value 3186 * of pswitch. The calls are reference counted so that only the first 3187 * "on" request actually has an effect, as does the final "off" request. 3188 * Results are undefined if the "off" and "on" requests are not matched. 3189 */ 3190 int 3191 ifpromisc(struct ifnet *ifp, int pswitch) 3192 { 3193 int error; 3194 int oldflags = ifp->if_flags; 3195 3196 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3197 &ifp->if_pcount, pswitch); 3198 /* If promiscuous mode status has changed, log a message */ 3199 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3200 log_promisc_mode_change) 3201 if_printf(ifp, "promiscuous mode %s\n", 3202 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3203 return (error); 3204 } 3205 3206 /* 3207 * Return interface configuration 3208 * of system. List may be used 3209 * in later ioctl's (above) to get 3210 * other information. 3211 */ 3212 /*ARGSUSED*/ 3213 static int 3214 ifconf(u_long cmd, caddr_t data) 3215 { 3216 struct ifconf *ifc = (struct ifconf *)data; 3217 struct ifnet *ifp; 3218 struct ifaddr *ifa; 3219 struct ifreq ifr; 3220 struct sbuf *sb; 3221 int error, full = 0, valid_len, max_len; 3222 3223 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3224 max_len = MAXPHYS - 1; 3225 3226 /* Prevent hostile input from being able to crash the system */ 3227 if (ifc->ifc_len <= 0) 3228 return (EINVAL); 3229 3230 again: 3231 if (ifc->ifc_len <= max_len) { 3232 max_len = ifc->ifc_len; 3233 full = 1; 3234 } 3235 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3236 max_len = 0; 3237 valid_len = 0; 3238 3239 IFNET_RLOCK(); 3240 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3241 struct epoch_tracker et; 3242 int addrs; 3243 3244 /* 3245 * Zero the ifr to make sure we don't disclose the contents 3246 * of the stack. 3247 */ 3248 memset(&ifr, 0, sizeof(ifr)); 3249 3250 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3251 >= sizeof(ifr.ifr_name)) { 3252 sbuf_delete(sb); 3253 IFNET_RUNLOCK(); 3254 return (ENAMETOOLONG); 3255 } 3256 3257 addrs = 0; 3258 NET_EPOCH_ENTER(et); 3259 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3260 struct sockaddr *sa = ifa->ifa_addr; 3261 3262 if (prison_if(curthread->td_ucred, sa) != 0) 3263 continue; 3264 addrs++; 3265 if (sa->sa_len <= sizeof(*sa)) { 3266 if (sa->sa_len < sizeof(*sa)) { 3267 memset(&ifr.ifr_ifru.ifru_addr, 0, 3268 sizeof(ifr.ifr_ifru.ifru_addr)); 3269 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3270 sa->sa_len); 3271 } else 3272 ifr.ifr_ifru.ifru_addr = *sa; 3273 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3274 max_len += sizeof(ifr); 3275 } else { 3276 sbuf_bcat(sb, &ifr, 3277 offsetof(struct ifreq, ifr_addr)); 3278 max_len += offsetof(struct ifreq, ifr_addr); 3279 sbuf_bcat(sb, sa, sa->sa_len); 3280 max_len += sa->sa_len; 3281 } 3282 3283 if (sbuf_error(sb) == 0) 3284 valid_len = sbuf_len(sb); 3285 } 3286 NET_EPOCH_EXIT(et); 3287 if (addrs == 0) { 3288 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3289 max_len += sizeof(ifr); 3290 3291 if (sbuf_error(sb) == 0) 3292 valid_len = sbuf_len(sb); 3293 } 3294 } 3295 IFNET_RUNLOCK(); 3296 3297 /* 3298 * If we didn't allocate enough space (uncommon), try again. If 3299 * we have already allocated as much space as we are allowed, 3300 * return what we've got. 3301 */ 3302 if (valid_len != max_len && !full) { 3303 sbuf_delete(sb); 3304 goto again; 3305 } 3306 3307 ifc->ifc_len = valid_len; 3308 sbuf_finish(sb); 3309 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3310 sbuf_delete(sb); 3311 return (error); 3312 } 3313 3314 /* 3315 * Just like ifpromisc(), but for all-multicast-reception mode. 3316 */ 3317 int 3318 if_allmulti(struct ifnet *ifp, int onswitch) 3319 { 3320 3321 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3322 } 3323 3324 struct ifmultiaddr * 3325 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3326 { 3327 struct ifmultiaddr *ifma; 3328 3329 IF_ADDR_LOCK_ASSERT(ifp); 3330 3331 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3332 if (sa->sa_family == AF_LINK) { 3333 if (sa_dl_equal(ifma->ifma_addr, sa)) 3334 break; 3335 } else { 3336 if (sa_equal(ifma->ifma_addr, sa)) 3337 break; 3338 } 3339 } 3340 3341 return ifma; 3342 } 3343 3344 /* 3345 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3346 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3347 * the ifnet multicast address list here, so the caller must do that and 3348 * other setup work (such as notifying the device driver). The reference 3349 * count is initialized to 1. 3350 */ 3351 static struct ifmultiaddr * 3352 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3353 int mflags) 3354 { 3355 struct ifmultiaddr *ifma; 3356 struct sockaddr *dupsa; 3357 3358 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3359 M_ZERO); 3360 if (ifma == NULL) 3361 return (NULL); 3362 3363 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3364 if (dupsa == NULL) { 3365 free(ifma, M_IFMADDR); 3366 return (NULL); 3367 } 3368 bcopy(sa, dupsa, sa->sa_len); 3369 ifma->ifma_addr = dupsa; 3370 3371 ifma->ifma_ifp = ifp; 3372 ifma->ifma_refcount = 1; 3373 ifma->ifma_protospec = NULL; 3374 3375 if (llsa == NULL) { 3376 ifma->ifma_lladdr = NULL; 3377 return (ifma); 3378 } 3379 3380 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3381 if (dupsa == NULL) { 3382 free(ifma->ifma_addr, M_IFMADDR); 3383 free(ifma, M_IFMADDR); 3384 return (NULL); 3385 } 3386 bcopy(llsa, dupsa, llsa->sa_len); 3387 ifma->ifma_lladdr = dupsa; 3388 3389 return (ifma); 3390 } 3391 3392 /* 3393 * if_freemulti: free ifmultiaddr structure and possibly attached related 3394 * addresses. The caller is responsible for implementing reference 3395 * counting, notifying the driver, handling routing messages, and releasing 3396 * any dependent link layer state. 3397 */ 3398 #ifdef MCAST_VERBOSE 3399 extern void kdb_backtrace(void); 3400 #endif 3401 static void 3402 if_freemulti_internal(struct ifmultiaddr *ifma) 3403 { 3404 3405 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3406 ifma->ifma_refcount)); 3407 3408 if (ifma->ifma_lladdr != NULL) 3409 free(ifma->ifma_lladdr, M_IFMADDR); 3410 #ifdef MCAST_VERBOSE 3411 kdb_backtrace(); 3412 printf("%s freeing ifma: %p\n", __func__, ifma); 3413 #endif 3414 free(ifma->ifma_addr, M_IFMADDR); 3415 free(ifma, M_IFMADDR); 3416 } 3417 3418 static void 3419 if_destroymulti(epoch_context_t ctx) 3420 { 3421 struct ifmultiaddr *ifma; 3422 3423 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3424 if_freemulti_internal(ifma); 3425 } 3426 3427 void 3428 if_freemulti(struct ifmultiaddr *ifma) 3429 { 3430 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3431 ifma->ifma_refcount)); 3432 3433 NET_EPOCH_CALL(if_destroymulti, &ifma->ifma_epoch_ctx); 3434 } 3435 3436 3437 /* 3438 * Register an additional multicast address with a network interface. 3439 * 3440 * - If the address is already present, bump the reference count on the 3441 * address and return. 3442 * - If the address is not link-layer, look up a link layer address. 3443 * - Allocate address structures for one or both addresses, and attach to the 3444 * multicast address list on the interface. If automatically adding a link 3445 * layer address, the protocol address will own a reference to the link 3446 * layer address, to be freed when it is freed. 3447 * - Notify the network device driver of an addition to the multicast address 3448 * list. 3449 * 3450 * 'sa' points to caller-owned memory with the desired multicast address. 3451 * 3452 * 'retifma' will be used to return a pointer to the resulting multicast 3453 * address reference, if desired. 3454 */ 3455 int 3456 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3457 struct ifmultiaddr **retifma) 3458 { 3459 struct ifmultiaddr *ifma, *ll_ifma; 3460 struct sockaddr *llsa; 3461 struct sockaddr_dl sdl; 3462 int error; 3463 3464 #ifdef INET 3465 IN_MULTI_LIST_UNLOCK_ASSERT(); 3466 #endif 3467 #ifdef INET6 3468 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3469 #endif 3470 /* 3471 * If the address is already present, return a new reference to it; 3472 * otherwise, allocate storage and set up a new address. 3473 */ 3474 IF_ADDR_WLOCK(ifp); 3475 ifma = if_findmulti(ifp, sa); 3476 if (ifma != NULL) { 3477 ifma->ifma_refcount++; 3478 if (retifma != NULL) 3479 *retifma = ifma; 3480 IF_ADDR_WUNLOCK(ifp); 3481 return (0); 3482 } 3483 3484 /* 3485 * The address isn't already present; resolve the protocol address 3486 * into a link layer address, and then look that up, bump its 3487 * refcount or allocate an ifma for that also. 3488 * Most link layer resolving functions returns address data which 3489 * fits inside default sockaddr_dl structure. However callback 3490 * can allocate another sockaddr structure, in that case we need to 3491 * free it later. 3492 */ 3493 llsa = NULL; 3494 ll_ifma = NULL; 3495 if (ifp->if_resolvemulti != NULL) { 3496 /* Provide called function with buffer size information */ 3497 sdl.sdl_len = sizeof(sdl); 3498 llsa = (struct sockaddr *)&sdl; 3499 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3500 if (error) 3501 goto unlock_out; 3502 } 3503 3504 /* 3505 * Allocate the new address. Don't hook it up yet, as we may also 3506 * need to allocate a link layer multicast address. 3507 */ 3508 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3509 if (ifma == NULL) { 3510 error = ENOMEM; 3511 goto free_llsa_out; 3512 } 3513 3514 /* 3515 * If a link layer address is found, we'll need to see if it's 3516 * already present in the address list, or allocate is as well. 3517 * When this block finishes, the link layer address will be on the 3518 * list. 3519 */ 3520 if (llsa != NULL) { 3521 ll_ifma = if_findmulti(ifp, llsa); 3522 if (ll_ifma == NULL) { 3523 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3524 if (ll_ifma == NULL) { 3525 --ifma->ifma_refcount; 3526 if_freemulti(ifma); 3527 error = ENOMEM; 3528 goto free_llsa_out; 3529 } 3530 ll_ifma->ifma_flags |= IFMA_F_ENQUEUED; 3531 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3532 ifma_link); 3533 } else 3534 ll_ifma->ifma_refcount++; 3535 ifma->ifma_llifma = ll_ifma; 3536 } 3537 3538 /* 3539 * We now have a new multicast address, ifma, and possibly a new or 3540 * referenced link layer address. Add the primary address to the 3541 * ifnet address list. 3542 */ 3543 ifma->ifma_flags |= IFMA_F_ENQUEUED; 3544 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3545 3546 if (retifma != NULL) 3547 *retifma = ifma; 3548 3549 /* 3550 * Must generate the message while holding the lock so that 'ifma' 3551 * pointer is still valid. 3552 */ 3553 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3554 IF_ADDR_WUNLOCK(ifp); 3555 3556 /* 3557 * We are certain we have added something, so call down to the 3558 * interface to let them know about it. 3559 */ 3560 if (ifp->if_ioctl != NULL) { 3561 if (THREAD_CAN_SLEEP()) 3562 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3563 else 3564 taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask); 3565 } 3566 3567 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3568 link_free_sdl(llsa); 3569 3570 return (0); 3571 3572 free_llsa_out: 3573 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3574 link_free_sdl(llsa); 3575 3576 unlock_out: 3577 IF_ADDR_WUNLOCK(ifp); 3578 return (error); 3579 } 3580 3581 static void 3582 if_siocaddmulti(void *arg, int pending) 3583 { 3584 struct ifnet *ifp; 3585 3586 ifp = arg; 3587 #ifdef DIAGNOSTIC 3588 if (pending > 1) 3589 if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending); 3590 #endif 3591 CURVNET_SET(ifp->if_vnet); 3592 (void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3593 CURVNET_RESTORE(); 3594 } 3595 3596 /* 3597 * Delete a multicast group membership by network-layer group address. 3598 * 3599 * Returns ENOENT if the entry could not be found. If ifp no longer 3600 * exists, results are undefined. This entry point should only be used 3601 * from subsystems which do appropriate locking to hold ifp for the 3602 * duration of the call. 3603 * Network-layer protocol domains must use if_delmulti_ifma(). 3604 */ 3605 int 3606 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3607 { 3608 struct ifmultiaddr *ifma; 3609 int lastref; 3610 3611 KASSERT(ifp, ("%s: NULL ifp", __func__)); 3612 3613 IF_ADDR_WLOCK(ifp); 3614 lastref = 0; 3615 ifma = if_findmulti(ifp, sa); 3616 if (ifma != NULL) 3617 lastref = if_delmulti_locked(ifp, ifma, 0); 3618 IF_ADDR_WUNLOCK(ifp); 3619 3620 if (ifma == NULL) 3621 return (ENOENT); 3622 3623 if (lastref && ifp->if_ioctl != NULL) { 3624 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3625 } 3626 3627 return (0); 3628 } 3629 3630 /* 3631 * Delete all multicast group membership for an interface. 3632 * Should be used to quickly flush all multicast filters. 3633 */ 3634 void 3635 if_delallmulti(struct ifnet *ifp) 3636 { 3637 struct ifmultiaddr *ifma; 3638 struct ifmultiaddr *next; 3639 3640 IF_ADDR_WLOCK(ifp); 3641 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3642 if_delmulti_locked(ifp, ifma, 0); 3643 IF_ADDR_WUNLOCK(ifp); 3644 } 3645 3646 void 3647 if_delmulti_ifma(struct ifmultiaddr *ifma) 3648 { 3649 if_delmulti_ifma_flags(ifma, 0); 3650 } 3651 3652 /* 3653 * Delete a multicast group membership by group membership pointer. 3654 * Network-layer protocol domains must use this routine. 3655 * 3656 * It is safe to call this routine if the ifp disappeared. 3657 */ 3658 void 3659 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3660 { 3661 struct ifnet *ifp; 3662 int lastref; 3663 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3664 #ifdef INET 3665 IN_MULTI_LIST_UNLOCK_ASSERT(); 3666 #endif 3667 ifp = ifma->ifma_ifp; 3668 #ifdef DIAGNOSTIC 3669 if (ifp == NULL) { 3670 printf("%s: ifma_ifp seems to be detached\n", __func__); 3671 } else { 3672 struct epoch_tracker et; 3673 struct ifnet *oifp; 3674 3675 NET_EPOCH_ENTER(et); 3676 CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link) 3677 if (ifp == oifp) 3678 break; 3679 NET_EPOCH_EXIT(et); 3680 if (ifp != oifp) 3681 ifp = NULL; 3682 } 3683 #endif 3684 /* 3685 * If and only if the ifnet instance exists: Acquire the address lock. 3686 */ 3687 if (ifp != NULL) 3688 IF_ADDR_WLOCK(ifp); 3689 3690 lastref = if_delmulti_locked(ifp, ifma, flags); 3691 3692 if (ifp != NULL) { 3693 /* 3694 * If and only if the ifnet instance exists: 3695 * Release the address lock. 3696 * If the group was left: update the hardware hash filter. 3697 */ 3698 IF_ADDR_WUNLOCK(ifp); 3699 if (lastref && ifp->if_ioctl != NULL) { 3700 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3701 } 3702 } 3703 } 3704 3705 /* 3706 * Perform deletion of network-layer and/or link-layer multicast address. 3707 * 3708 * Return 0 if the reference count was decremented. 3709 * Return 1 if the final reference was released, indicating that the 3710 * hardware hash filter should be reprogrammed. 3711 */ 3712 static int 3713 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3714 { 3715 struct ifmultiaddr *ll_ifma; 3716 3717 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3718 KASSERT(ifma->ifma_ifp == ifp, 3719 ("%s: inconsistent ifp %p", __func__, ifp)); 3720 IF_ADDR_WLOCK_ASSERT(ifp); 3721 } 3722 3723 ifp = ifma->ifma_ifp; 3724 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3725 3726 /* 3727 * If the ifnet is detaching, null out references to ifnet, 3728 * so that upper protocol layers will notice, and not attempt 3729 * to obtain locks for an ifnet which no longer exists. The 3730 * routing socket announcement must happen before the ifnet 3731 * instance is detached from the system. 3732 */ 3733 if (detaching) { 3734 #ifdef DIAGNOSTIC 3735 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3736 #endif 3737 /* 3738 * ifp may already be nulled out if we are being reentered 3739 * to delete the ll_ifma. 3740 */ 3741 if (ifp != NULL) { 3742 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3743 ifma->ifma_ifp = NULL; 3744 } 3745 } 3746 3747 if (--ifma->ifma_refcount > 0) 3748 return 0; 3749 3750 if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) { 3751 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3752 ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3753 } 3754 /* 3755 * If this ifma is a network-layer ifma, a link-layer ifma may 3756 * have been associated with it. Release it first if so. 3757 */ 3758 ll_ifma = ifma->ifma_llifma; 3759 if (ll_ifma != NULL) { 3760 KASSERT(ifma->ifma_lladdr != NULL, 3761 ("%s: llifma w/o lladdr", __func__)); 3762 if (detaching) 3763 ll_ifma->ifma_ifp = NULL; /* XXX */ 3764 if (--ll_ifma->ifma_refcount == 0) { 3765 if (ifp != NULL) { 3766 if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) { 3767 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3768 ifma_link); 3769 ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED; 3770 } 3771 } 3772 if_freemulti(ll_ifma); 3773 } 3774 } 3775 #ifdef INVARIANTS 3776 if (ifp) { 3777 struct ifmultiaddr *ifmatmp; 3778 3779 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3780 MPASS(ifma != ifmatmp); 3781 } 3782 #endif 3783 if_freemulti(ifma); 3784 /* 3785 * The last reference to this instance of struct ifmultiaddr 3786 * was released; the hardware should be notified of this change. 3787 */ 3788 return 1; 3789 } 3790 3791 /* 3792 * Set the link layer address on an interface. 3793 * 3794 * At this time we only support certain types of interfaces, 3795 * and we don't allow the length of the address to change. 3796 * 3797 * Set noinline to be dtrace-friendly 3798 */ 3799 __noinline int 3800 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3801 { 3802 struct sockaddr_dl *sdl; 3803 struct ifaddr *ifa; 3804 struct ifreq ifr; 3805 3806 ifa = ifp->if_addr; 3807 if (ifa == NULL) 3808 return (EINVAL); 3809 3810 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3811 if (sdl == NULL) 3812 return (EINVAL); 3813 3814 if (len != sdl->sdl_alen) /* don't allow length to change */ 3815 return (EINVAL); 3816 3817 switch (ifp->if_type) { 3818 case IFT_ETHER: 3819 case IFT_XETHER: 3820 case IFT_L2VLAN: 3821 case IFT_BRIDGE: 3822 case IFT_IEEE8023ADLAG: 3823 bcopy(lladdr, LLADDR(sdl), len); 3824 break; 3825 default: 3826 return (ENODEV); 3827 } 3828 3829 /* 3830 * If the interface is already up, we need 3831 * to re-init it in order to reprogram its 3832 * address filter. 3833 */ 3834 if ((ifp->if_flags & IFF_UP) != 0) { 3835 if (ifp->if_ioctl) { 3836 ifp->if_flags &= ~IFF_UP; 3837 ifr.ifr_flags = ifp->if_flags & 0xffff; 3838 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3839 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3840 ifp->if_flags |= IFF_UP; 3841 ifr.ifr_flags = ifp->if_flags & 0xffff; 3842 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3843 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3844 } 3845 } 3846 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3847 3848 return (0); 3849 } 3850 3851 /* 3852 * Compat function for handling basic encapsulation requests. 3853 * Not converted stacks (FDDI, IB, ..) supports traditional 3854 * output model: ARP (and other similar L2 protocols) are handled 3855 * inside output routine, arpresolve/nd6_resolve() returns MAC 3856 * address instead of full prepend. 3857 * 3858 * This function creates calculated header==MAC for IPv4/IPv6 and 3859 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3860 * address families. 3861 */ 3862 static int 3863 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3864 { 3865 3866 if (req->rtype != IFENCAP_LL) 3867 return (EOPNOTSUPP); 3868 3869 if (req->bufsize < req->lladdr_len) 3870 return (ENOMEM); 3871 3872 switch (req->family) { 3873 case AF_INET: 3874 case AF_INET6: 3875 break; 3876 default: 3877 return (EAFNOSUPPORT); 3878 } 3879 3880 /* Copy lladdr to storage as is */ 3881 memmove(req->buf, req->lladdr, req->lladdr_len); 3882 req->bufsize = req->lladdr_len; 3883 req->lladdr_off = 0; 3884 3885 return (0); 3886 } 3887 3888 /* 3889 * Tunnel interfaces can nest, also they may cause infinite recursion 3890 * calls when misconfigured. We'll prevent this by detecting loops. 3891 * High nesting level may cause stack exhaustion. We'll prevent this 3892 * by introducing upper limit. 3893 * 3894 * Return 0, if tunnel nesting count is equal or less than limit. 3895 */ 3896 int 3897 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie, 3898 int limit) 3899 { 3900 struct m_tag *mtag; 3901 int count; 3902 3903 count = 1; 3904 mtag = NULL; 3905 while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) { 3906 if (*(struct ifnet **)(mtag + 1) == ifp) { 3907 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp)); 3908 return (EIO); 3909 } 3910 count++; 3911 } 3912 if (count > limit) { 3913 log(LOG_NOTICE, 3914 "%s: if_output recursively called too many times(%d)\n", 3915 if_name(ifp), count); 3916 return (EIO); 3917 } 3918 mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT); 3919 if (mtag == NULL) 3920 return (ENOMEM); 3921 *(struct ifnet **)(mtag + 1) = ifp; 3922 m_tag_prepend(m, mtag); 3923 return (0); 3924 } 3925 3926 /* 3927 * Get the link layer address that was read from the hardware at attach. 3928 * 3929 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3930 * their component interfaces as IFT_IEEE8023ADLAG. 3931 */ 3932 int 3933 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3934 { 3935 3936 if (ifp->if_hw_addr == NULL) 3937 return (ENODEV); 3938 3939 switch (ifp->if_type) { 3940 case IFT_ETHER: 3941 case IFT_IEEE8023ADLAG: 3942 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3943 return (0); 3944 default: 3945 return (ENODEV); 3946 } 3947 } 3948 3949 /* 3950 * The name argument must be a pointer to storage which will last as 3951 * long as the interface does. For physical devices, the result of 3952 * device_get_name(dev) is a good choice and for pseudo-devices a 3953 * static string works well. 3954 */ 3955 void 3956 if_initname(struct ifnet *ifp, const char *name, int unit) 3957 { 3958 ifp->if_dname = name; 3959 ifp->if_dunit = unit; 3960 if (unit != IF_DUNIT_NONE) 3961 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3962 else 3963 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3964 } 3965 3966 int 3967 if_printf(struct ifnet *ifp, const char *fmt, ...) 3968 { 3969 char if_fmt[256]; 3970 va_list ap; 3971 3972 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3973 va_start(ap, fmt); 3974 vlog(LOG_INFO, if_fmt, ap); 3975 va_end(ap); 3976 return (0); 3977 } 3978 3979 void 3980 if_start(struct ifnet *ifp) 3981 { 3982 3983 (*(ifp)->if_start)(ifp); 3984 } 3985 3986 /* 3987 * Backwards compatibility interface for drivers 3988 * that have not implemented it 3989 */ 3990 static int 3991 if_transmit(struct ifnet *ifp, struct mbuf *m) 3992 { 3993 int error; 3994 3995 IFQ_HANDOFF(ifp, m, error); 3996 return (error); 3997 } 3998 3999 static void 4000 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 4001 { 4002 4003 m_freem(m); 4004 } 4005 4006 int 4007 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 4008 { 4009 int active = 0; 4010 4011 IF_LOCK(ifq); 4012 if (_IF_QFULL(ifq)) { 4013 IF_UNLOCK(ifq); 4014 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 4015 m_freem(m); 4016 return (0); 4017 } 4018 if (ifp != NULL) { 4019 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 4020 if (m->m_flags & (M_BCAST|M_MCAST)) 4021 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 4022 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4023 } 4024 _IF_ENQUEUE(ifq, m); 4025 IF_UNLOCK(ifq); 4026 if (ifp != NULL && !active) 4027 (*(ifp)->if_start)(ifp); 4028 return (1); 4029 } 4030 4031 void 4032 if_register_com_alloc(u_char type, 4033 if_com_alloc_t *a, if_com_free_t *f) 4034 { 4035 4036 KASSERT(if_com_alloc[type] == NULL, 4037 ("if_register_com_alloc: %d already registered", type)); 4038 KASSERT(if_com_free[type] == NULL, 4039 ("if_register_com_alloc: %d free already registered", type)); 4040 4041 if_com_alloc[type] = a; 4042 if_com_free[type] = f; 4043 } 4044 4045 void 4046 if_deregister_com_alloc(u_char type) 4047 { 4048 4049 KASSERT(if_com_alloc[type] != NULL, 4050 ("if_deregister_com_alloc: %d not registered", type)); 4051 KASSERT(if_com_free[type] != NULL, 4052 ("if_deregister_com_alloc: %d free not registered", type)); 4053 if_com_alloc[type] = NULL; 4054 if_com_free[type] = NULL; 4055 } 4056 4057 /* API for driver access to network stack owned ifnet.*/ 4058 uint64_t 4059 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4060 { 4061 uint64_t oldbrate; 4062 4063 oldbrate = ifp->if_baudrate; 4064 ifp->if_baudrate = baudrate; 4065 return (oldbrate); 4066 } 4067 4068 uint64_t 4069 if_getbaudrate(if_t ifp) 4070 { 4071 4072 return (((struct ifnet *)ifp)->if_baudrate); 4073 } 4074 4075 int 4076 if_setcapabilities(if_t ifp, int capabilities) 4077 { 4078 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4079 return (0); 4080 } 4081 4082 int 4083 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4084 { 4085 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4086 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4087 4088 return (0); 4089 } 4090 4091 int 4092 if_getcapabilities(if_t ifp) 4093 { 4094 return ((struct ifnet *)ifp)->if_capabilities; 4095 } 4096 4097 int 4098 if_setcapenable(if_t ifp, int capabilities) 4099 { 4100 ((struct ifnet *)ifp)->if_capenable = capabilities; 4101 return (0); 4102 } 4103 4104 int 4105 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4106 { 4107 if(setcap) 4108 ((struct ifnet *)ifp)->if_capenable |= setcap; 4109 if(clearcap) 4110 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4111 4112 return (0); 4113 } 4114 4115 const char * 4116 if_getdname(if_t ifp) 4117 { 4118 return ((struct ifnet *)ifp)->if_dname; 4119 } 4120 4121 int 4122 if_togglecapenable(if_t ifp, int togglecap) 4123 { 4124 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4125 return (0); 4126 } 4127 4128 int 4129 if_getcapenable(if_t ifp) 4130 { 4131 return ((struct ifnet *)ifp)->if_capenable; 4132 } 4133 4134 /* 4135 * This is largely undesirable because it ties ifnet to a device, but does 4136 * provide flexiblity for an embedded product vendor. Should be used with 4137 * the understanding that it violates the interface boundaries, and should be 4138 * a last resort only. 4139 */ 4140 int 4141 if_setdev(if_t ifp, void *dev) 4142 { 4143 return (0); 4144 } 4145 4146 int 4147 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4148 { 4149 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4150 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4151 4152 return (0); 4153 } 4154 4155 int 4156 if_getdrvflags(if_t ifp) 4157 { 4158 return ((struct ifnet *)ifp)->if_drv_flags; 4159 } 4160 4161 int 4162 if_setdrvflags(if_t ifp, int flags) 4163 { 4164 ((struct ifnet *)ifp)->if_drv_flags = flags; 4165 return (0); 4166 } 4167 4168 4169 int 4170 if_setflags(if_t ifp, int flags) 4171 { 4172 4173 ifp->if_flags = flags; 4174 return (0); 4175 } 4176 4177 int 4178 if_setflagbits(if_t ifp, int set, int clear) 4179 { 4180 ((struct ifnet *)ifp)->if_flags |= set; 4181 ((struct ifnet *)ifp)->if_flags &= ~clear; 4182 4183 return (0); 4184 } 4185 4186 int 4187 if_getflags(if_t ifp) 4188 { 4189 return ((struct ifnet *)ifp)->if_flags; 4190 } 4191 4192 int 4193 if_clearhwassist(if_t ifp) 4194 { 4195 ((struct ifnet *)ifp)->if_hwassist = 0; 4196 return (0); 4197 } 4198 4199 int 4200 if_sethwassistbits(if_t ifp, int toset, int toclear) 4201 { 4202 ((struct ifnet *)ifp)->if_hwassist |= toset; 4203 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4204 4205 return (0); 4206 } 4207 4208 int 4209 if_sethwassist(if_t ifp, int hwassist_bit) 4210 { 4211 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4212 return (0); 4213 } 4214 4215 int 4216 if_gethwassist(if_t ifp) 4217 { 4218 return ((struct ifnet *)ifp)->if_hwassist; 4219 } 4220 4221 int 4222 if_setmtu(if_t ifp, int mtu) 4223 { 4224 ((struct ifnet *)ifp)->if_mtu = mtu; 4225 return (0); 4226 } 4227 4228 int 4229 if_getmtu(if_t ifp) 4230 { 4231 return ((struct ifnet *)ifp)->if_mtu; 4232 } 4233 4234 int 4235 if_getmtu_family(if_t ifp, int family) 4236 { 4237 struct domain *dp; 4238 4239 for (dp = domains; dp; dp = dp->dom_next) { 4240 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4241 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4242 } 4243 4244 return (((struct ifnet *)ifp)->if_mtu); 4245 } 4246 4247 /* 4248 * Methods for drivers to access interface unicast and multicast 4249 * link level addresses. Driver shall not know 'struct ifaddr' neither 4250 * 'struct ifmultiaddr'. 4251 */ 4252 u_int 4253 if_lladdr_count(if_t ifp) 4254 { 4255 struct epoch_tracker et; 4256 struct ifaddr *ifa; 4257 u_int count; 4258 4259 count = 0; 4260 NET_EPOCH_ENTER(et); 4261 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 4262 if (ifa->ifa_addr->sa_family == AF_LINK) 4263 count++; 4264 NET_EPOCH_EXIT(et); 4265 4266 return (count); 4267 } 4268 4269 u_int 4270 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4271 { 4272 struct epoch_tracker et; 4273 struct ifaddr *ifa; 4274 u_int count; 4275 4276 MPASS(cb); 4277 4278 count = 0; 4279 NET_EPOCH_ENTER(et); 4280 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 4281 if (ifa->ifa_addr->sa_family != AF_LINK) 4282 continue; 4283 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr, 4284 count); 4285 } 4286 NET_EPOCH_EXIT(et); 4287 4288 return (count); 4289 } 4290 4291 u_int 4292 if_llmaddr_count(if_t ifp) 4293 { 4294 struct epoch_tracker et; 4295 struct ifmultiaddr *ifma; 4296 int count; 4297 4298 count = 0; 4299 NET_EPOCH_ENTER(et); 4300 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4301 if (ifma->ifma_addr->sa_family == AF_LINK) 4302 count++; 4303 NET_EPOCH_EXIT(et); 4304 4305 return (count); 4306 } 4307 4308 u_int 4309 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg) 4310 { 4311 struct epoch_tracker et; 4312 struct ifmultiaddr *ifma; 4313 u_int count; 4314 4315 MPASS(cb); 4316 4317 count = 0; 4318 NET_EPOCH_ENTER(et); 4319 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 4320 if (ifma->ifma_addr->sa_family != AF_LINK) 4321 continue; 4322 count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr, 4323 count); 4324 } 4325 NET_EPOCH_EXIT(et); 4326 4327 return (count); 4328 } 4329 4330 int 4331 if_setsoftc(if_t ifp, void *softc) 4332 { 4333 ((struct ifnet *)ifp)->if_softc = softc; 4334 return (0); 4335 } 4336 4337 void * 4338 if_getsoftc(if_t ifp) 4339 { 4340 return ((struct ifnet *)ifp)->if_softc; 4341 } 4342 4343 void 4344 if_setrcvif(struct mbuf *m, if_t ifp) 4345 { 4346 4347 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 4348 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4349 } 4350 4351 void 4352 if_setvtag(struct mbuf *m, uint16_t tag) 4353 { 4354 m->m_pkthdr.ether_vtag = tag; 4355 } 4356 4357 uint16_t 4358 if_getvtag(struct mbuf *m) 4359 { 4360 4361 return (m->m_pkthdr.ether_vtag); 4362 } 4363 4364 int 4365 if_sendq_empty(if_t ifp) 4366 { 4367 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4368 } 4369 4370 struct ifaddr * 4371 if_getifaddr(if_t ifp) 4372 { 4373 return ((struct ifnet *)ifp)->if_addr; 4374 } 4375 4376 int 4377 if_getamcount(if_t ifp) 4378 { 4379 return ((struct ifnet *)ifp)->if_amcount; 4380 } 4381 4382 4383 int 4384 if_setsendqready(if_t ifp) 4385 { 4386 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4387 return (0); 4388 } 4389 4390 int 4391 if_setsendqlen(if_t ifp, int tx_desc_count) 4392 { 4393 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4394 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4395 4396 return (0); 4397 } 4398 4399 int 4400 if_vlantrunkinuse(if_t ifp) 4401 { 4402 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4403 } 4404 4405 int 4406 if_input(if_t ifp, struct mbuf* sendmp) 4407 { 4408 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4409 return (0); 4410 4411 } 4412 4413 struct mbuf * 4414 if_dequeue(if_t ifp) 4415 { 4416 struct mbuf *m; 4417 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4418 4419 return (m); 4420 } 4421 4422 int 4423 if_sendq_prepend(if_t ifp, struct mbuf *m) 4424 { 4425 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4426 return (0); 4427 } 4428 4429 int 4430 if_setifheaderlen(if_t ifp, int len) 4431 { 4432 ((struct ifnet *)ifp)->if_hdrlen = len; 4433 return (0); 4434 } 4435 4436 caddr_t 4437 if_getlladdr(if_t ifp) 4438 { 4439 return (IF_LLADDR((struct ifnet *)ifp)); 4440 } 4441 4442 void * 4443 if_gethandle(u_char type) 4444 { 4445 return (if_alloc(type)); 4446 } 4447 4448 void 4449 if_bpfmtap(if_t ifh, struct mbuf *m) 4450 { 4451 struct ifnet *ifp = (struct ifnet *)ifh; 4452 4453 BPF_MTAP(ifp, m); 4454 } 4455 4456 void 4457 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4458 { 4459 struct ifnet *ifp = (struct ifnet *)ifh; 4460 4461 ETHER_BPF_MTAP(ifp, m); 4462 } 4463 4464 void 4465 if_vlancap(if_t ifh) 4466 { 4467 struct ifnet *ifp = (struct ifnet *)ifh; 4468 VLAN_CAPABILITIES(ifp); 4469 } 4470 4471 int 4472 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4473 { 4474 4475 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4476 return (0); 4477 } 4478 4479 int 4480 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4481 { 4482 4483 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4484 return (0); 4485 } 4486 4487 int 4488 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4489 { 4490 4491 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4492 return (0); 4493 } 4494 4495 u_int 4496 if_gethwtsomax(if_t ifp) 4497 { 4498 4499 return (((struct ifnet *)ifp)->if_hw_tsomax); 4500 } 4501 4502 u_int 4503 if_gethwtsomaxsegcount(if_t ifp) 4504 { 4505 4506 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4507 } 4508 4509 u_int 4510 if_gethwtsomaxsegsize(if_t ifp) 4511 { 4512 4513 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4514 } 4515 4516 void 4517 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4518 { 4519 ((struct ifnet *)ifp)->if_init = init_fn; 4520 } 4521 4522 void 4523 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4524 { 4525 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4526 } 4527 4528 void 4529 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4530 { 4531 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4532 } 4533 4534 void 4535 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4536 { 4537 ((struct ifnet *)ifp)->if_transmit = start_fn; 4538 } 4539 4540 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4541 { 4542 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4543 4544 } 4545 4546 void 4547 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4548 { 4549 4550 ifp->if_get_counter = fn; 4551 } 4552 4553 /* Revisit these - These are inline functions originally. */ 4554 int 4555 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4556 { 4557 return drbr_inuse(ifh, br); 4558 } 4559 4560 struct mbuf* 4561 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4562 { 4563 return drbr_dequeue(ifh, br); 4564 } 4565 4566 int 4567 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4568 { 4569 return drbr_needs_enqueue(ifh, br); 4570 } 4571 4572 int 4573 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4574 { 4575 return drbr_enqueue(ifh, br, m); 4576 4577 } 4578