1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if.c 8.5 (Berkeley) 1/9/95 32 * $FreeBSD$ 33 */ 34 35 #include "opt_inet6.h" 36 #include "opt_inet.h" 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/conf.h> 41 #include <sys/malloc.h> 42 #include <sys/sbuf.h> 43 #include <sys/bus.h> 44 #include <sys/epoch.h> 45 #include <sys/mbuf.h> 46 #include <sys/systm.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/refcount.h> 55 #include <sys/module.h> 56 #include <sys/rwlock.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/taskqueue.h> 62 #include <sys/domain.h> 63 #include <sys/jail.h> 64 #include <sys/priv.h> 65 66 #include <machine/stdarg.h> 67 #include <vm/uma.h> 68 69 #include <net/bpf.h> 70 #include <net/ethernet.h> 71 #include <net/if.h> 72 #include <net/if_arp.h> 73 #include <net/if_clone.h> 74 #include <net/if_dl.h> 75 #include <net/if_types.h> 76 #include <net/if_var.h> 77 #include <net/if_media.h> 78 #include <net/if_vlan_var.h> 79 #include <net/radix.h> 80 #include <net/route.h> 81 #include <net/vnet.h> 82 83 #if defined(INET) || defined(INET6) 84 #include <net/ethernet.h> 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/ip.h> 88 #include <netinet/ip_carp.h> 89 #ifdef INET 90 #include <netinet/if_ether.h> 91 #include <netinet/netdump/netdump.h> 92 #endif /* INET */ 93 #ifdef INET6 94 #include <netinet6/in6_var.h> 95 #include <netinet6/in6_ifattach.h> 96 #endif /* INET6 */ 97 #endif /* INET || INET6 */ 98 99 #include <security/mac/mac_framework.h> 100 101 /* 102 * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name 103 * and ifr_ifru when it is used in SIOCGIFCONF. 104 */ 105 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) == 106 offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru"); 107 108 __read_mostly epoch_t net_epoch_preempt; 109 __read_mostly epoch_t net_epoch; 110 #ifdef COMPAT_FREEBSD32 111 #include <sys/mount.h> 112 #include <compat/freebsd32/freebsd32.h> 113 114 struct ifreq_buffer32 { 115 uint32_t length; /* (size_t) */ 116 uint32_t buffer; /* (void *) */ 117 }; 118 119 /* 120 * Interface request structure used for socket 121 * ioctl's. All interface ioctl's must have parameter 122 * definitions which begin with ifr_name. The 123 * remainder may be interface specific. 124 */ 125 struct ifreq32 { 126 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 127 union { 128 struct sockaddr ifru_addr; 129 struct sockaddr ifru_dstaddr; 130 struct sockaddr ifru_broadaddr; 131 struct ifreq_buffer32 ifru_buffer; 132 short ifru_flags[2]; 133 short ifru_index; 134 int ifru_jid; 135 int ifru_metric; 136 int ifru_mtu; 137 int ifru_phys; 138 int ifru_media; 139 uint32_t ifru_data; 140 int ifru_cap[2]; 141 u_int ifru_fib; 142 u_char ifru_vlan_pcp; 143 } ifr_ifru; 144 }; 145 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32)); 146 CTASSERT(__offsetof(struct ifreq, ifr_ifru) == 147 __offsetof(struct ifreq32, ifr_ifru)); 148 149 struct ifgroupreq32 { 150 char ifgr_name[IFNAMSIZ]; 151 u_int ifgr_len; 152 union { 153 char ifgru_group[IFNAMSIZ]; 154 uint32_t ifgru_groups; 155 } ifgr_ifgru; 156 }; 157 158 struct ifmediareq32 { 159 char ifm_name[IFNAMSIZ]; 160 int ifm_current; 161 int ifm_mask; 162 int ifm_status; 163 int ifm_active; 164 int ifm_count; 165 uint32_t ifm_ulist; /* (int *) */ 166 }; 167 #define SIOCGIFMEDIA32 _IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32) 168 #define SIOCGIFXMEDIA32 _IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32) 169 170 #define _CASE_IOC_IFGROUPREQ_32(cmd) \ 171 case _IOC_NEWTYPE((cmd), struct ifgroupreq32): 172 #else /* !COMPAT_FREEBSD32 */ 173 #define _CASE_IOC_IFGROUPREQ_32(cmd) 174 #endif /* !COMPAT_FREEBSD32 */ 175 176 #define CASE_IOC_IFGROUPREQ(cmd) \ 177 _CASE_IOC_IFGROUPREQ_32(cmd) \ 178 case (cmd) 179 180 union ifreq_union { 181 struct ifreq ifr; 182 #ifdef COMPAT_FREEBSD32 183 struct ifreq32 ifr32; 184 #endif 185 }; 186 187 union ifgroupreq_union { 188 struct ifgroupreq ifgr; 189 #ifdef COMPAT_FREEBSD32 190 struct ifgroupreq32 ifgr32; 191 #endif 192 }; 193 194 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 195 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 196 197 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 198 &ifqmaxlen, 0, "max send queue size"); 199 200 /* Log link state change events */ 201 static int log_link_state_change = 1; 202 203 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 204 &log_link_state_change, 0, 205 "log interface link state change events"); 206 207 /* Log promiscuous mode change events */ 208 static int log_promisc_mode_change = 1; 209 210 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN, 211 &log_promisc_mode_change, 1, 212 "log promiscuous mode change events"); 213 214 /* Interface description */ 215 static unsigned int ifdescr_maxlen = 1024; 216 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 217 &ifdescr_maxlen, 0, 218 "administrative maximum length for interface description"); 219 220 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 221 222 /* global sx for non-critical path ifdescr */ 223 static struct sx ifdescr_sx; 224 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 225 226 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 227 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 228 /* These are external hooks for CARP. */ 229 void (*carp_linkstate_p)(struct ifnet *ifp); 230 void (*carp_demote_adj_p)(int, char *); 231 int (*carp_master_p)(struct ifaddr *); 232 #if defined(INET) || defined(INET6) 233 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 234 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 235 const struct sockaddr *sa); 236 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 237 int (*carp_attach_p)(struct ifaddr *, int); 238 void (*carp_detach_p)(struct ifaddr *, bool); 239 #endif 240 #ifdef INET 241 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 242 #endif 243 #ifdef INET6 244 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 245 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 246 const struct in6_addr *taddr); 247 #endif 248 249 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 250 251 /* 252 * XXX: Style; these should be sorted alphabetically, and unprototyped 253 * static functions should be prototyped. Currently they are sorted by 254 * declaration order. 255 */ 256 static void if_attachdomain(void *); 257 static void if_attachdomain1(struct ifnet *); 258 static int ifconf(u_long, caddr_t); 259 static void if_grow(void); 260 static void if_input_default(struct ifnet *, struct mbuf *); 261 static int if_requestencap_default(struct ifnet *, struct if_encap_req *); 262 static void if_route(struct ifnet *, int flag, int fam); 263 static int if_setflag(struct ifnet *, int, int, int *, int); 264 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 265 static void if_unroute(struct ifnet *, int flag, int fam); 266 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 267 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 268 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 269 static void do_link_state_change(void *, int); 270 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 271 static int if_getgroupmembers(struct ifgroupreq *); 272 static void if_delgroups(struct ifnet *); 273 static void if_attach_internal(struct ifnet *, int, struct if_clone *); 274 static int if_detach_internal(struct ifnet *, int, struct if_clone **); 275 #ifdef VIMAGE 276 static void if_vmove(struct ifnet *, struct vnet *); 277 #endif 278 279 #ifdef INET6 280 /* 281 * XXX: declare here to avoid to include many inet6 related files.. 282 * should be more generalized? 283 */ 284 extern void nd6_setmtu(struct ifnet *); 285 #endif 286 287 /* ipsec helper hooks */ 288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]); 289 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]); 290 291 VNET_DEFINE(int, if_index); 292 int ifqmaxlen = IFQ_MAXLEN; 293 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 294 VNET_DEFINE(struct ifgrouphead, ifg_head); 295 296 static VNET_DEFINE(int, if_indexlim) = 8; 297 298 /* Table of ifnet by index. */ 299 VNET_DEFINE(struct ifnet **, ifindex_table); 300 301 #define V_if_indexlim VNET(if_indexlim) 302 #define V_ifindex_table VNET(ifindex_table) 303 304 /* 305 * The global network interface list (V_ifnet) and related state (such as 306 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 307 * an rwlock. Either may be acquired shared to stablize the list, but both 308 * must be acquired writable to modify the list. This model allows us to 309 * both stablize the interface list during interrupt thread processing, but 310 * also to stablize it over long-running ioctls, without introducing priority 311 * inversions and deadlocks. 312 */ 313 struct rwlock ifnet_rwlock; 314 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 315 struct sx ifnet_sxlock; 316 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 317 318 /* 319 * The allocation of network interfaces is a rather non-atomic affair; we 320 * need to select an index before we are ready to expose the interface for 321 * use, so will use this pointer value to indicate reservation. 322 */ 323 #define IFNET_HOLD (void *)(uintptr_t)(-1) 324 325 static if_com_alloc_t *if_com_alloc[256]; 326 static if_com_free_t *if_com_free[256]; 327 328 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 329 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 330 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 331 332 struct ifnet * 333 ifnet_byindex_locked(u_short idx) 334 { 335 336 if (idx > V_if_index) 337 return (NULL); 338 if (V_ifindex_table[idx] == IFNET_HOLD) 339 return (NULL); 340 return (V_ifindex_table[idx]); 341 } 342 343 struct ifnet * 344 ifnet_byindex(u_short idx) 345 { 346 struct ifnet *ifp; 347 348 IFNET_RLOCK_NOSLEEP(); 349 ifp = ifnet_byindex_locked(idx); 350 IFNET_RUNLOCK_NOSLEEP(); 351 return (ifp); 352 } 353 354 struct ifnet * 355 ifnet_byindex_ref(u_short idx) 356 { 357 struct ifnet *ifp; 358 359 IFNET_RLOCK_NOSLEEP(); 360 ifp = ifnet_byindex_locked(idx); 361 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 362 IFNET_RUNLOCK_NOSLEEP(); 363 return (NULL); 364 } 365 if_ref(ifp); 366 IFNET_RUNLOCK_NOSLEEP(); 367 return (ifp); 368 } 369 370 /* 371 * Allocate an ifindex array entry; return 0 on success or an error on 372 * failure. 373 */ 374 static u_short 375 ifindex_alloc(void) 376 { 377 u_short idx; 378 379 IFNET_WLOCK_ASSERT(); 380 retry: 381 /* 382 * Try to find an empty slot below V_if_index. If we fail, take the 383 * next slot. 384 */ 385 for (idx = 1; idx <= V_if_index; idx++) { 386 if (V_ifindex_table[idx] == NULL) 387 break; 388 } 389 390 /* Catch if_index overflow. */ 391 if (idx >= V_if_indexlim) { 392 if_grow(); 393 goto retry; 394 } 395 if (idx > V_if_index) 396 V_if_index = idx; 397 return (idx); 398 } 399 400 static void 401 ifindex_free_locked(u_short idx) 402 { 403 404 IFNET_WLOCK_ASSERT(); 405 406 V_ifindex_table[idx] = NULL; 407 while (V_if_index > 0 && 408 V_ifindex_table[V_if_index] == NULL) 409 V_if_index--; 410 } 411 412 static void 413 ifindex_free(u_short idx) 414 { 415 416 IFNET_WLOCK(); 417 ifindex_free_locked(idx); 418 IFNET_WUNLOCK(); 419 } 420 421 static void 422 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 423 { 424 425 IFNET_WLOCK_ASSERT(); 426 427 V_ifindex_table[idx] = ifp; 428 } 429 430 static void 431 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 432 { 433 434 IFNET_WLOCK(); 435 ifnet_setbyindex_locked(idx, ifp); 436 IFNET_WUNLOCK(); 437 } 438 439 struct ifaddr * 440 ifaddr_byindex(u_short idx) 441 { 442 struct ifnet *ifp; 443 struct ifaddr *ifa = NULL; 444 445 IFNET_RLOCK_NOSLEEP(); 446 ifp = ifnet_byindex_locked(idx); 447 if (ifp != NULL && (ifa = ifp->if_addr) != NULL) 448 ifa_ref(ifa); 449 IFNET_RUNLOCK_NOSLEEP(); 450 return (ifa); 451 } 452 453 /* 454 * Network interface utility routines. 455 * 456 * Routines with ifa_ifwith* names take sockaddr *'s as 457 * parameters. 458 */ 459 460 static void 461 vnet_if_init(const void *unused __unused) 462 { 463 464 TAILQ_INIT(&V_ifnet); 465 TAILQ_INIT(&V_ifg_head); 466 IFNET_WLOCK(); 467 if_grow(); /* create initial table */ 468 IFNET_WUNLOCK(); 469 vnet_if_clone_init(); 470 } 471 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 472 NULL); 473 474 #ifdef VIMAGE 475 static void 476 vnet_if_uninit(const void *unused __unused) 477 { 478 479 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 480 "not empty", __func__, __LINE__, &V_ifnet)); 481 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 482 "not empty", __func__, __LINE__, &V_ifg_head)); 483 484 free((caddr_t)V_ifindex_table, M_IFNET); 485 } 486 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 487 vnet_if_uninit, NULL); 488 489 static void 490 vnet_if_return(const void *unused __unused) 491 { 492 struct ifnet *ifp, *nifp; 493 494 /* Return all inherited interfaces to their parent vnets. */ 495 TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 496 if (ifp->if_home_vnet != ifp->if_vnet) 497 if_vmove(ifp, ifp->if_home_vnet); 498 } 499 } 500 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY, 501 vnet_if_return, NULL); 502 #endif 503 504 static void 505 if_grow(void) 506 { 507 int oldlim; 508 u_int n; 509 struct ifnet **e; 510 511 IFNET_WLOCK_ASSERT(); 512 oldlim = V_if_indexlim; 513 IFNET_WUNLOCK(); 514 n = (oldlim << 1) * sizeof(*e); 515 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 516 IFNET_WLOCK(); 517 if (V_if_indexlim != oldlim) { 518 free(e, M_IFNET); 519 return; 520 } 521 if (V_ifindex_table != NULL) { 522 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 523 free((caddr_t)V_ifindex_table, M_IFNET); 524 } 525 V_if_indexlim <<= 1; 526 V_ifindex_table = e; 527 } 528 529 /* 530 * Allocate a struct ifnet and an index for an interface. A layer 2 531 * common structure will also be allocated if an allocation routine is 532 * registered for the passed type. 533 */ 534 struct ifnet * 535 if_alloc(u_char type) 536 { 537 struct ifnet *ifp; 538 u_short idx; 539 540 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 541 IFNET_WLOCK(); 542 idx = ifindex_alloc(); 543 ifnet_setbyindex_locked(idx, IFNET_HOLD); 544 IFNET_WUNLOCK(); 545 ifp->if_index = idx; 546 ifp->if_type = type; 547 ifp->if_alloctype = type; 548 #ifdef VIMAGE 549 ifp->if_vnet = curvnet; 550 #endif 551 if (if_com_alloc[type] != NULL) { 552 ifp->if_l2com = if_com_alloc[type](type, ifp); 553 if (ifp->if_l2com == NULL) { 554 free(ifp, M_IFNET); 555 ifindex_free(idx); 556 return (NULL); 557 } 558 } 559 560 IF_ADDR_LOCK_INIT(ifp); 561 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 562 ifp->if_afdata_initialized = 0; 563 IF_AFDATA_LOCK_INIT(ifp); 564 CK_STAILQ_INIT(&ifp->if_addrhead); 565 CK_STAILQ_INIT(&ifp->if_multiaddrs); 566 TAILQ_INIT(&ifp->if_groups); 567 #ifdef MAC 568 mac_ifnet_init(ifp); 569 #endif 570 ifq_init(&ifp->if_snd, ifp); 571 572 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 573 for (int i = 0; i < IFCOUNTERS; i++) 574 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 575 ifp->if_get_counter = if_get_counter_default; 576 ifp->if_pcp = IFNET_PCP_NONE; 577 ifnet_setbyindex(ifp->if_index, ifp); 578 return (ifp); 579 } 580 581 /* 582 * Do the actual work of freeing a struct ifnet, and layer 2 common 583 * structure. This call is made when the last reference to an 584 * interface is released. 585 */ 586 static void 587 if_free_internal(struct ifnet *ifp) 588 { 589 590 KASSERT((ifp->if_flags & IFF_DYING), 591 ("if_free_internal: interface not dying")); 592 593 if (if_com_free[ifp->if_alloctype] != NULL) 594 if_com_free[ifp->if_alloctype](ifp->if_l2com, 595 ifp->if_alloctype); 596 597 #ifdef MAC 598 mac_ifnet_destroy(ifp); 599 #endif /* MAC */ 600 if (ifp->if_description != NULL) 601 free(ifp->if_description, M_IFDESCR); 602 IF_AFDATA_DESTROY(ifp); 603 IF_ADDR_LOCK_DESTROY(ifp); 604 ifq_delete(&ifp->if_snd); 605 606 for (int i = 0; i < IFCOUNTERS; i++) 607 counter_u64_free(ifp->if_counters[i]); 608 609 free(ifp, M_IFNET); 610 } 611 612 /* 613 * Deregister an interface and free the associated storage. 614 */ 615 void 616 if_free(struct ifnet *ifp) 617 { 618 619 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 620 621 CURVNET_SET_QUIET(ifp->if_vnet); 622 IFNET_WLOCK(); 623 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 624 ("%s: freeing unallocated ifnet", ifp->if_xname)); 625 626 ifindex_free_locked(ifp->if_index); 627 IFNET_WUNLOCK(); 628 629 if (refcount_release(&ifp->if_refcount)) 630 if_free_internal(ifp); 631 CURVNET_RESTORE(); 632 } 633 634 /* 635 * Interfaces to keep an ifnet type-stable despite the possibility of the 636 * driver calling if_free(). If there are additional references, we defer 637 * freeing the underlying data structure. 638 */ 639 void 640 if_ref(struct ifnet *ifp) 641 { 642 643 /* We don't assert the ifnet list lock here, but arguably should. */ 644 refcount_acquire(&ifp->if_refcount); 645 } 646 647 void 648 if_rele(struct ifnet *ifp) 649 { 650 651 if (!refcount_release(&ifp->if_refcount)) 652 return; 653 if_free_internal(ifp); 654 } 655 656 void 657 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 658 { 659 660 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 661 662 if (ifq->ifq_maxlen == 0) 663 ifq->ifq_maxlen = ifqmaxlen; 664 665 ifq->altq_type = 0; 666 ifq->altq_disc = NULL; 667 ifq->altq_flags &= ALTQF_CANTCHANGE; 668 ifq->altq_tbr = NULL; 669 ifq->altq_ifp = ifp; 670 } 671 672 void 673 ifq_delete(struct ifaltq *ifq) 674 { 675 mtx_destroy(&ifq->ifq_mtx); 676 } 677 678 /* 679 * Perform generic interface initialization tasks and attach the interface 680 * to the list of "active" interfaces. If vmove flag is set on entry 681 * to if_attach_internal(), perform only a limited subset of initialization 682 * tasks, given that we are moving from one vnet to another an ifnet which 683 * has already been fully initialized. 684 * 685 * Note that if_detach_internal() removes group membership unconditionally 686 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 687 * Thus, when if_vmove() is applied to a cloned interface, group membership 688 * is lost while a cloned one always joins a group whose name is 689 * ifc->ifc_name. To recover this after if_detach_internal() and 690 * if_attach_internal(), the cloner should be specified to 691 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 692 * attempts to join a group whose name is ifc->ifc_name. 693 * 694 * XXX: 695 * - The decision to return void and thus require this function to 696 * succeed is questionable. 697 * - We should probably do more sanity checking. For instance we don't 698 * do anything to insure if_xname is unique or non-empty. 699 */ 700 void 701 if_attach(struct ifnet *ifp) 702 { 703 704 if_attach_internal(ifp, 0, NULL); 705 } 706 707 /* 708 * Compute the least common TSO limit. 709 */ 710 void 711 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 712 { 713 /* 714 * 1) If there is no limit currently, take the limit from 715 * the network adapter. 716 * 717 * 2) If the network adapter has a limit below the current 718 * limit, apply it. 719 */ 720 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 721 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 722 pmax->tsomaxbytes = ifp->if_hw_tsomax; 723 } 724 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 725 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 726 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 727 } 728 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 729 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 730 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 731 } 732 } 733 734 /* 735 * Update TSO limit of a network adapter. 736 * 737 * Returns zero if no change. Else non-zero. 738 */ 739 int 740 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 741 { 742 int retval = 0; 743 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 744 ifp->if_hw_tsomax = pmax->tsomaxbytes; 745 retval++; 746 } 747 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 748 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 749 retval++; 750 } 751 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 752 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 753 retval++; 754 } 755 return (retval); 756 } 757 758 static void 759 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 760 { 761 unsigned socksize, ifasize; 762 int namelen, masklen; 763 struct sockaddr_dl *sdl; 764 struct ifaddr *ifa; 765 766 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 767 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 768 ifp->if_xname); 769 770 #ifdef VIMAGE 771 ifp->if_vnet = curvnet; 772 if (ifp->if_home_vnet == NULL) 773 ifp->if_home_vnet = curvnet; 774 #endif 775 776 if_addgroup(ifp, IFG_ALL); 777 778 /* Restore group membership for cloned interfaces. */ 779 if (vmove && ifc != NULL) 780 if_clone_addgroup(ifp, ifc); 781 782 getmicrotime(&ifp->if_lastchange); 783 ifp->if_epoch = time_uptime; 784 785 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 786 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 787 ("transmit and qflush must both either be set or both be NULL")); 788 if (ifp->if_transmit == NULL) { 789 ifp->if_transmit = if_transmit; 790 ifp->if_qflush = if_qflush; 791 } 792 if (ifp->if_input == NULL) 793 ifp->if_input = if_input_default; 794 795 if (ifp->if_requestencap == NULL) 796 ifp->if_requestencap = if_requestencap_default; 797 798 if (!vmove) { 799 #ifdef MAC 800 mac_ifnet_create(ifp); 801 #endif 802 803 /* 804 * Create a Link Level name for this device. 805 */ 806 namelen = strlen(ifp->if_xname); 807 /* 808 * Always save enough space for any possiable name so we 809 * can do a rename in place later. 810 */ 811 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 812 socksize = masklen + ifp->if_addrlen; 813 if (socksize < sizeof(*sdl)) 814 socksize = sizeof(*sdl); 815 socksize = roundup2(socksize, sizeof(long)); 816 ifasize = sizeof(*ifa) + 2 * socksize; 817 ifa = ifa_alloc(ifasize, M_WAITOK); 818 sdl = (struct sockaddr_dl *)(ifa + 1); 819 sdl->sdl_len = socksize; 820 sdl->sdl_family = AF_LINK; 821 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 822 sdl->sdl_nlen = namelen; 823 sdl->sdl_index = ifp->if_index; 824 sdl->sdl_type = ifp->if_type; 825 ifp->if_addr = ifa; 826 ifa->ifa_ifp = ifp; 827 ifa->ifa_rtrequest = link_rtrequest; 828 ifa->ifa_addr = (struct sockaddr *)sdl; 829 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 830 ifa->ifa_netmask = (struct sockaddr *)sdl; 831 sdl->sdl_len = masklen; 832 while (namelen != 0) 833 sdl->sdl_data[--namelen] = 0xff; 834 CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 835 /* Reliably crash if used uninitialized. */ 836 ifp->if_broadcastaddr = NULL; 837 838 if (ifp->if_type == IFT_ETHER) { 839 ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR, 840 M_WAITOK | M_ZERO); 841 } 842 843 #if defined(INET) || defined(INET6) 844 /* Use defaults for TSO, if nothing is set */ 845 if (ifp->if_hw_tsomax == 0 && 846 ifp->if_hw_tsomaxsegcount == 0 && 847 ifp->if_hw_tsomaxsegsize == 0) { 848 /* 849 * The TSO defaults needs to be such that an 850 * NFS mbuf list of 35 mbufs totalling just 851 * below 64K works and that a chain of mbufs 852 * can be defragged into at most 32 segments: 853 */ 854 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 855 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 856 ifp->if_hw_tsomaxsegcount = 35; 857 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 858 859 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 860 if (ifp->if_capabilities & IFCAP_TSO) { 861 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 862 ifp->if_hw_tsomax, 863 ifp->if_hw_tsomaxsegcount, 864 ifp->if_hw_tsomaxsegsize); 865 } 866 } 867 #endif 868 } 869 #ifdef VIMAGE 870 else { 871 /* 872 * Update the interface index in the link layer address 873 * of the interface. 874 */ 875 for (ifa = ifp->if_addr; ifa != NULL; 876 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) { 877 if (ifa->ifa_addr->sa_family == AF_LINK) { 878 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 879 sdl->sdl_index = ifp->if_index; 880 } 881 } 882 } 883 #endif 884 885 IFNET_WLOCK(); 886 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 887 #ifdef VIMAGE 888 curvnet->vnet_ifcnt++; 889 #endif 890 IFNET_WUNLOCK(); 891 892 if (domain_init_status >= 2) 893 if_attachdomain1(ifp); 894 895 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 896 if (IS_DEFAULT_VNET(curvnet)) 897 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 898 899 /* Announce the interface. */ 900 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 901 } 902 903 static void 904 if_epochalloc(void *dummy __unused) 905 { 906 907 net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT); 908 net_epoch = epoch_alloc(0); 909 } 910 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY, 911 if_epochalloc, NULL); 912 913 static void 914 if_attachdomain(void *dummy) 915 { 916 struct ifnet *ifp; 917 918 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 919 if_attachdomain1(ifp); 920 } 921 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 922 if_attachdomain, NULL); 923 924 static void 925 if_attachdomain1(struct ifnet *ifp) 926 { 927 struct domain *dp; 928 929 /* 930 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 931 * cannot lock ifp->if_afdata initialization, entirely. 932 */ 933 IF_AFDATA_LOCK(ifp); 934 if (ifp->if_afdata_initialized >= domain_init_status) { 935 IF_AFDATA_UNLOCK(ifp); 936 log(LOG_WARNING, "%s called more than once on %s\n", 937 __func__, ifp->if_xname); 938 return; 939 } 940 ifp->if_afdata_initialized = domain_init_status; 941 IF_AFDATA_UNLOCK(ifp); 942 943 /* address family dependent data region */ 944 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 945 for (dp = domains; dp; dp = dp->dom_next) { 946 if (dp->dom_ifattach) 947 ifp->if_afdata[dp->dom_family] = 948 (*dp->dom_ifattach)(ifp); 949 } 950 } 951 952 /* 953 * Remove any unicast or broadcast network addresses from an interface. 954 */ 955 void 956 if_purgeaddrs(struct ifnet *ifp) 957 { 958 struct ifaddr *ifa, *next; 959 960 /* XXX cannot hold IF_ADDR_WLOCK over called functions. */ 961 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 962 if (ifa->ifa_addr->sa_family == AF_LINK) 963 continue; 964 #ifdef INET 965 /* XXX: Ugly!! ad hoc just for INET */ 966 if (ifa->ifa_addr->sa_family == AF_INET) { 967 struct ifaliasreq ifr; 968 969 bzero(&ifr, sizeof(ifr)); 970 ifr.ifra_addr = *ifa->ifa_addr; 971 if (ifa->ifa_dstaddr) 972 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 973 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 974 NULL) == 0) 975 continue; 976 } 977 #endif /* INET */ 978 #ifdef INET6 979 if (ifa->ifa_addr->sa_family == AF_INET6) { 980 in6_purgeaddr(ifa); 981 /* ifp_addrhead is already updated */ 982 continue; 983 } 984 #endif /* INET6 */ 985 IF_ADDR_WLOCK(ifp); 986 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 987 IF_ADDR_WUNLOCK(ifp); 988 ifa_free(ifa); 989 } 990 } 991 992 /* 993 * Remove any multicast network addresses from an interface when an ifnet 994 * is going away. 995 */ 996 static void 997 if_purgemaddrs(struct ifnet *ifp) 998 { 999 struct ifmultiaddr *ifma; 1000 1001 IF_ADDR_WLOCK(ifp); 1002 while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) { 1003 ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs); 1004 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 1005 if_delmulti_locked(ifp, ifma, 1); 1006 } 1007 IF_ADDR_WUNLOCK(ifp); 1008 } 1009 1010 /* 1011 * Detach an interface, removing it from the list of "active" interfaces. 1012 * If vmove flag is set on entry to if_detach_internal(), perform only a 1013 * limited subset of cleanup tasks, given that we are moving an ifnet from 1014 * one vnet to another, where it must be fully operational. 1015 * 1016 * XXXRW: There are some significant questions about event ordering, and 1017 * how to prevent things from starting to use the interface during detach. 1018 */ 1019 void 1020 if_detach(struct ifnet *ifp) 1021 { 1022 1023 CURVNET_SET_QUIET(ifp->if_vnet); 1024 if_detach_internal(ifp, 0, NULL); 1025 CURVNET_RESTORE(); 1026 } 1027 1028 /* 1029 * The vmove flag, if set, indicates that we are called from a callpath 1030 * that is moving an interface to a different vnet instance. 1031 * 1032 * The shutdown flag, if set, indicates that we are called in the 1033 * process of shutting down a vnet instance. Currently only the 1034 * vnet_if_return SYSUNINIT function sets it. Note: we can be called 1035 * on a vnet instance shutdown without this flag being set, e.g., when 1036 * the cloned interfaces are destoyed as first thing of teardown. 1037 */ 1038 static int 1039 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 1040 { 1041 struct ifaddr *ifa; 1042 int i; 1043 struct domain *dp; 1044 struct ifnet *iter; 1045 int found = 0; 1046 #ifdef VIMAGE 1047 int shutdown; 1048 1049 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1050 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1051 #endif 1052 IFNET_WLOCK(); 1053 TAILQ_FOREACH(iter, &V_ifnet, if_link) 1054 if (iter == ifp) { 1055 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 1056 found = 1; 1057 break; 1058 } 1059 IFNET_WUNLOCK(); 1060 if (!found) { 1061 /* 1062 * While we would want to panic here, we cannot 1063 * guarantee that the interface is indeed still on 1064 * the list given we don't hold locks all the way. 1065 */ 1066 return (ENOENT); 1067 #if 0 1068 if (vmove) 1069 panic("%s: ifp=%p not on the ifnet tailq %p", 1070 __func__, ifp, &V_ifnet); 1071 else 1072 return; /* XXX this should panic as well? */ 1073 #endif 1074 } 1075 1076 /* 1077 * At this point we know the interface still was on the ifnet list 1078 * and we removed it so we are in a stable state. 1079 */ 1080 #ifdef VIMAGE 1081 curvnet->vnet_ifcnt--; 1082 #endif 1083 1084 /* 1085 * In any case (destroy or vmove) detach us from the groups 1086 * and remove/wait for pending events on the taskq. 1087 * XXX-BZ in theory an interface could still enqueue a taskq change? 1088 */ 1089 if_delgroups(ifp); 1090 1091 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 1092 1093 /* 1094 * Check if this is a cloned interface or not. Must do even if 1095 * shutting down as a if_vmove_reclaim() would move the ifp and 1096 * the if_clone_addgroup() will have a corrupted string overwise 1097 * from a gibberish pointer. 1098 */ 1099 if (vmove && ifcp != NULL) 1100 *ifcp = if_clone_findifc(ifp); 1101 1102 if_down(ifp); 1103 1104 #ifdef VIMAGE 1105 /* 1106 * On VNET shutdown abort here as the stack teardown will do all 1107 * the work top-down for us. 1108 */ 1109 if (shutdown) { 1110 /* 1111 * In case of a vmove we are done here without error. 1112 * If we would signal an error it would lead to the same 1113 * abort as if we did not find the ifnet anymore. 1114 * if_detach() calls us in void context and does not care 1115 * about an early abort notification, so life is splendid :) 1116 */ 1117 goto finish_vnet_shutdown; 1118 } 1119 #endif 1120 1121 /* 1122 * At this point we are not tearing down a VNET and are either 1123 * going to destroy or vmove the interface and have to cleanup 1124 * accordingly. 1125 */ 1126 1127 /* 1128 * Remove routes and flush queues. 1129 */ 1130 #ifdef ALTQ 1131 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 1132 altq_disable(&ifp->if_snd); 1133 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 1134 altq_detach(&ifp->if_snd); 1135 #endif 1136 1137 if_purgeaddrs(ifp); 1138 1139 #ifdef INET 1140 in_ifdetach(ifp); 1141 #endif 1142 1143 #ifdef INET6 1144 /* 1145 * Remove all IPv6 kernel structs related to ifp. This should be done 1146 * before removing routing entries below, since IPv6 interface direct 1147 * routes are expected to be removed by the IPv6-specific kernel API. 1148 * Otherwise, the kernel will detect some inconsistency and bark it. 1149 */ 1150 in6_ifdetach(ifp); 1151 #endif 1152 if_purgemaddrs(ifp); 1153 1154 /* Announce that the interface is gone. */ 1155 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1156 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1157 if (IS_DEFAULT_VNET(curvnet)) 1158 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 1159 1160 if (!vmove) { 1161 /* 1162 * Prevent further calls into the device driver via ifnet. 1163 */ 1164 if_dead(ifp); 1165 1166 /* 1167 * Remove link ifaddr pointer and maybe decrement if_index. 1168 * Clean up all addresses. 1169 */ 1170 free(ifp->if_hw_addr, M_IFADDR); 1171 ifp->if_hw_addr = NULL; 1172 ifp->if_addr = NULL; 1173 1174 /* We can now free link ifaddr. */ 1175 IF_ADDR_WLOCK(ifp); 1176 if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) { 1177 ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 1178 CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link); 1179 IF_ADDR_WUNLOCK(ifp); 1180 ifa_free(ifa); 1181 } else 1182 IF_ADDR_WUNLOCK(ifp); 1183 } 1184 1185 rt_flushifroutes(ifp); 1186 1187 #ifdef VIMAGE 1188 finish_vnet_shutdown: 1189 #endif 1190 /* 1191 * We cannot hold the lock over dom_ifdetach calls as they might 1192 * sleep, for example trying to drain a callout, thus open up the 1193 * theoretical race with re-attaching. 1194 */ 1195 IF_AFDATA_LOCK(ifp); 1196 i = ifp->if_afdata_initialized; 1197 ifp->if_afdata_initialized = 0; 1198 IF_AFDATA_UNLOCK(ifp); 1199 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1200 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) { 1201 (*dp->dom_ifdetach)(ifp, 1202 ifp->if_afdata[dp->dom_family]); 1203 ifp->if_afdata[dp->dom_family] = NULL; 1204 } 1205 } 1206 1207 return (0); 1208 } 1209 1210 #ifdef VIMAGE 1211 /* 1212 * if_vmove() performs a limited version of if_detach() in current 1213 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1214 * An attempt is made to shrink if_index in current vnet, find an 1215 * unused if_index in target vnet and calls if_grow() if necessary, 1216 * and finally find an unused if_xname for the target vnet. 1217 */ 1218 static void 1219 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1220 { 1221 struct if_clone *ifc; 1222 u_int bif_dlt, bif_hdrlen; 1223 int rc; 1224 1225 /* 1226 * if_detach_internal() will call the eventhandler to notify 1227 * interface departure. That will detach if_bpf. We need to 1228 * safe the dlt and hdrlen so we can re-attach it later. 1229 */ 1230 bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen); 1231 1232 /* 1233 * Detach from current vnet, but preserve LLADDR info, do not 1234 * mark as dead etc. so that the ifnet can be reattached later. 1235 * If we cannot find it, we lost the race to someone else. 1236 */ 1237 rc = if_detach_internal(ifp, 1, &ifc); 1238 if (rc != 0) 1239 return; 1240 1241 /* 1242 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1243 * the if_index for that vnet if possible. 1244 * 1245 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1246 * or we'd lock on one vnet and unlock on another. 1247 */ 1248 IFNET_WLOCK(); 1249 ifindex_free_locked(ifp->if_index); 1250 IFNET_WUNLOCK(); 1251 1252 /* 1253 * Perform interface-specific reassignment tasks, if provided by 1254 * the driver. 1255 */ 1256 if (ifp->if_reassign != NULL) 1257 ifp->if_reassign(ifp, new_vnet, NULL); 1258 1259 /* 1260 * Switch to the context of the target vnet. 1261 */ 1262 CURVNET_SET_QUIET(new_vnet); 1263 1264 IFNET_WLOCK(); 1265 ifp->if_index = ifindex_alloc(); 1266 ifnet_setbyindex_locked(ifp->if_index, ifp); 1267 IFNET_WUNLOCK(); 1268 1269 if_attach_internal(ifp, 1, ifc); 1270 1271 if (ifp->if_bpf == NULL) 1272 bpfattach(ifp, bif_dlt, bif_hdrlen); 1273 1274 CURVNET_RESTORE(); 1275 } 1276 1277 /* 1278 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1279 */ 1280 static int 1281 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1282 { 1283 struct prison *pr; 1284 struct ifnet *difp; 1285 int shutdown; 1286 1287 /* Try to find the prison within our visibility. */ 1288 sx_slock(&allprison_lock); 1289 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1290 sx_sunlock(&allprison_lock); 1291 if (pr == NULL) 1292 return (ENXIO); 1293 prison_hold_locked(pr); 1294 mtx_unlock(&pr->pr_mtx); 1295 1296 /* Do not try to move the iface from and to the same prison. */ 1297 if (pr->pr_vnet == ifp->if_vnet) { 1298 prison_free(pr); 1299 return (EEXIST); 1300 } 1301 1302 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1303 /* XXX Lock interfaces to avoid races. */ 1304 CURVNET_SET_QUIET(pr->pr_vnet); 1305 difp = ifunit(ifname); 1306 if (difp != NULL) { 1307 CURVNET_RESTORE(); 1308 prison_free(pr); 1309 return (EEXIST); 1310 } 1311 1312 /* Make sure the VNET is stable. */ 1313 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1314 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1315 if (shutdown) { 1316 CURVNET_RESTORE(); 1317 prison_free(pr); 1318 return (EBUSY); 1319 } 1320 CURVNET_RESTORE(); 1321 1322 /* Move the interface into the child jail/vnet. */ 1323 if_vmove(ifp, pr->pr_vnet); 1324 1325 /* Report the new if_xname back to the userland. */ 1326 sprintf(ifname, "%s", ifp->if_xname); 1327 1328 prison_free(pr); 1329 return (0); 1330 } 1331 1332 static int 1333 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1334 { 1335 struct prison *pr; 1336 struct vnet *vnet_dst; 1337 struct ifnet *ifp; 1338 int shutdown; 1339 1340 /* Try to find the prison within our visibility. */ 1341 sx_slock(&allprison_lock); 1342 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1343 sx_sunlock(&allprison_lock); 1344 if (pr == NULL) 1345 return (ENXIO); 1346 prison_hold_locked(pr); 1347 mtx_unlock(&pr->pr_mtx); 1348 1349 /* Make sure the named iface exists in the source prison/vnet. */ 1350 CURVNET_SET(pr->pr_vnet); 1351 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1352 if (ifp == NULL) { 1353 CURVNET_RESTORE(); 1354 prison_free(pr); 1355 return (ENXIO); 1356 } 1357 1358 /* Do not try to move the iface from and to the same prison. */ 1359 vnet_dst = TD_TO_VNET(td); 1360 if (vnet_dst == ifp->if_vnet) { 1361 CURVNET_RESTORE(); 1362 prison_free(pr); 1363 return (EEXIST); 1364 } 1365 1366 /* Make sure the VNET is stable. */ 1367 shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET && 1368 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 1369 if (shutdown) { 1370 CURVNET_RESTORE(); 1371 prison_free(pr); 1372 return (EBUSY); 1373 } 1374 1375 /* Get interface back from child jail/vnet. */ 1376 if_vmove(ifp, vnet_dst); 1377 CURVNET_RESTORE(); 1378 1379 /* Report the new if_xname back to the userland. */ 1380 sprintf(ifname, "%s", ifp->if_xname); 1381 1382 prison_free(pr); 1383 return (0); 1384 } 1385 #endif /* VIMAGE */ 1386 1387 /* 1388 * Add a group to an interface 1389 */ 1390 int 1391 if_addgroup(struct ifnet *ifp, const char *groupname) 1392 { 1393 struct ifg_list *ifgl; 1394 struct ifg_group *ifg = NULL; 1395 struct ifg_member *ifgm; 1396 int new = 0; 1397 1398 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1399 groupname[strlen(groupname) - 1] <= '9') 1400 return (EINVAL); 1401 1402 IFNET_WLOCK(); 1403 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1404 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1405 IFNET_WUNLOCK(); 1406 return (EEXIST); 1407 } 1408 1409 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1410 M_NOWAIT)) == NULL) { 1411 IFNET_WUNLOCK(); 1412 return (ENOMEM); 1413 } 1414 1415 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1416 M_TEMP, M_NOWAIT)) == NULL) { 1417 free(ifgl, M_TEMP); 1418 IFNET_WUNLOCK(); 1419 return (ENOMEM); 1420 } 1421 1422 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1423 if (!strcmp(ifg->ifg_group, groupname)) 1424 break; 1425 1426 if (ifg == NULL) { 1427 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1428 M_TEMP, M_NOWAIT)) == NULL) { 1429 free(ifgl, M_TEMP); 1430 free(ifgm, M_TEMP); 1431 IFNET_WUNLOCK(); 1432 return (ENOMEM); 1433 } 1434 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1435 ifg->ifg_refcnt = 0; 1436 TAILQ_INIT(&ifg->ifg_members); 1437 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1438 new = 1; 1439 } 1440 1441 ifg->ifg_refcnt++; 1442 ifgl->ifgl_group = ifg; 1443 ifgm->ifgm_ifp = ifp; 1444 1445 IF_ADDR_WLOCK(ifp); 1446 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1447 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1448 IF_ADDR_WUNLOCK(ifp); 1449 1450 IFNET_WUNLOCK(); 1451 1452 if (new) 1453 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1454 EVENTHANDLER_INVOKE(group_change_event, groupname); 1455 1456 return (0); 1457 } 1458 1459 /* 1460 * Remove a group from an interface 1461 */ 1462 int 1463 if_delgroup(struct ifnet *ifp, const char *groupname) 1464 { 1465 struct ifg_list *ifgl; 1466 struct ifg_member *ifgm; 1467 1468 IFNET_WLOCK(); 1469 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1470 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1471 break; 1472 if (ifgl == NULL) { 1473 IFNET_WUNLOCK(); 1474 return (ENOENT); 1475 } 1476 1477 IF_ADDR_WLOCK(ifp); 1478 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1479 IF_ADDR_WUNLOCK(ifp); 1480 1481 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1482 if (ifgm->ifgm_ifp == ifp) 1483 break; 1484 1485 if (ifgm != NULL) { 1486 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1487 free(ifgm, M_TEMP); 1488 } 1489 1490 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1491 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1492 IFNET_WUNLOCK(); 1493 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1494 free(ifgl->ifgl_group, M_TEMP); 1495 } else 1496 IFNET_WUNLOCK(); 1497 1498 free(ifgl, M_TEMP); 1499 1500 EVENTHANDLER_INVOKE(group_change_event, groupname); 1501 1502 return (0); 1503 } 1504 1505 /* 1506 * Remove an interface from all groups 1507 */ 1508 static void 1509 if_delgroups(struct ifnet *ifp) 1510 { 1511 struct ifg_list *ifgl; 1512 struct ifg_member *ifgm; 1513 char groupname[IFNAMSIZ]; 1514 1515 IFNET_WLOCK(); 1516 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1517 ifgl = TAILQ_FIRST(&ifp->if_groups); 1518 1519 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1520 1521 IF_ADDR_WLOCK(ifp); 1522 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1523 IF_ADDR_WUNLOCK(ifp); 1524 1525 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1526 if (ifgm->ifgm_ifp == ifp) 1527 break; 1528 1529 if (ifgm != NULL) { 1530 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1531 ifgm_next); 1532 free(ifgm, M_TEMP); 1533 } 1534 1535 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1536 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1537 IFNET_WUNLOCK(); 1538 EVENTHANDLER_INVOKE(group_detach_event, 1539 ifgl->ifgl_group); 1540 free(ifgl->ifgl_group, M_TEMP); 1541 } else 1542 IFNET_WUNLOCK(); 1543 1544 free(ifgl, M_TEMP); 1545 1546 EVENTHANDLER_INVOKE(group_change_event, groupname); 1547 1548 IFNET_WLOCK(); 1549 } 1550 IFNET_WUNLOCK(); 1551 } 1552 1553 static char * 1554 ifgr_group_get(void *ifgrp) 1555 { 1556 union ifgroupreq_union *ifgrup; 1557 1558 ifgrup = ifgrp; 1559 #ifdef COMPAT_FREEBSD32 1560 if (SV_CURPROC_FLAG(SV_ILP32)) 1561 return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]); 1562 #endif 1563 return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]); 1564 } 1565 1566 static struct ifg_req * 1567 ifgr_groups_get(void *ifgrp) 1568 { 1569 union ifgroupreq_union *ifgrup; 1570 1571 ifgrup = ifgrp; 1572 #ifdef COMPAT_FREEBSD32 1573 if (SV_CURPROC_FLAG(SV_ILP32)) 1574 return ((struct ifg_req *)(uintptr_t) 1575 ifgrup->ifgr32.ifgr_ifgru.ifgru_groups); 1576 #endif 1577 return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups); 1578 } 1579 1580 /* 1581 * Stores all groups from an interface in memory pointed to by ifgr. 1582 */ 1583 static int 1584 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp) 1585 { 1586 int len, error; 1587 struct ifg_list *ifgl; 1588 struct ifg_req ifgrq, *ifgp; 1589 1590 if (ifgr->ifgr_len == 0) { 1591 IF_ADDR_RLOCK(ifp); 1592 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1593 ifgr->ifgr_len += sizeof(struct ifg_req); 1594 IF_ADDR_RUNLOCK(ifp); 1595 return (0); 1596 } 1597 1598 len = ifgr->ifgr_len; 1599 ifgp = ifgr_groups_get(ifgr); 1600 /* XXX: wire */ 1601 IF_ADDR_RLOCK(ifp); 1602 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1603 if (len < sizeof(ifgrq)) { 1604 IF_ADDR_RUNLOCK(ifp); 1605 return (EINVAL); 1606 } 1607 bzero(&ifgrq, sizeof ifgrq); 1608 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1609 sizeof(ifgrq.ifgrq_group)); 1610 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1611 IF_ADDR_RUNLOCK(ifp); 1612 return (error); 1613 } 1614 len -= sizeof(ifgrq); 1615 ifgp++; 1616 } 1617 IF_ADDR_RUNLOCK(ifp); 1618 1619 return (0); 1620 } 1621 1622 /* 1623 * Stores all members of a group in memory pointed to by igfr 1624 */ 1625 static int 1626 if_getgroupmembers(struct ifgroupreq *ifgr) 1627 { 1628 struct ifg_group *ifg; 1629 struct ifg_member *ifgm; 1630 struct ifg_req ifgrq, *ifgp; 1631 int len, error; 1632 1633 IFNET_RLOCK(); 1634 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1635 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1636 break; 1637 if (ifg == NULL) { 1638 IFNET_RUNLOCK(); 1639 return (ENOENT); 1640 } 1641 1642 if (ifgr->ifgr_len == 0) { 1643 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1644 ifgr->ifgr_len += sizeof(ifgrq); 1645 IFNET_RUNLOCK(); 1646 return (0); 1647 } 1648 1649 len = ifgr->ifgr_len; 1650 ifgp = ifgr_groups_get(ifgr); 1651 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1652 if (len < sizeof(ifgrq)) { 1653 IFNET_RUNLOCK(); 1654 return (EINVAL); 1655 } 1656 bzero(&ifgrq, sizeof ifgrq); 1657 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1658 sizeof(ifgrq.ifgrq_member)); 1659 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1660 IFNET_RUNLOCK(); 1661 return (error); 1662 } 1663 len -= sizeof(ifgrq); 1664 ifgp++; 1665 } 1666 IFNET_RUNLOCK(); 1667 1668 return (0); 1669 } 1670 1671 /* 1672 * Return counter values from counter(9)s stored in ifnet. 1673 */ 1674 uint64_t 1675 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1676 { 1677 1678 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1679 1680 return (counter_u64_fetch(ifp->if_counters[cnt])); 1681 } 1682 1683 /* 1684 * Increase an ifnet counter. Usually used for counters shared 1685 * between the stack and a driver, but function supports them all. 1686 */ 1687 void 1688 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1689 { 1690 1691 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1692 1693 counter_u64_add(ifp->if_counters[cnt], inc); 1694 } 1695 1696 /* 1697 * Copy data from ifnet to userland API structure if_data. 1698 */ 1699 void 1700 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1701 { 1702 1703 ifd->ifi_type = ifp->if_type; 1704 ifd->ifi_physical = 0; 1705 ifd->ifi_addrlen = ifp->if_addrlen; 1706 ifd->ifi_hdrlen = ifp->if_hdrlen; 1707 ifd->ifi_link_state = ifp->if_link_state; 1708 ifd->ifi_vhid = 0; 1709 ifd->ifi_datalen = sizeof(struct if_data); 1710 ifd->ifi_mtu = ifp->if_mtu; 1711 ifd->ifi_metric = ifp->if_metric; 1712 ifd->ifi_baudrate = ifp->if_baudrate; 1713 ifd->ifi_hwassist = ifp->if_hwassist; 1714 ifd->ifi_epoch = ifp->if_epoch; 1715 ifd->ifi_lastchange = ifp->if_lastchange; 1716 1717 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1718 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1719 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1720 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1721 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1722 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1723 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1724 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1725 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1726 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1727 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1728 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1729 } 1730 1731 /* 1732 * Wrapper functions for struct ifnet address list locking macros. These are 1733 * used by kernel modules to avoid encoding programming interface or binary 1734 * interface assumptions that may be violated when kernel-internal locking 1735 * approaches change. 1736 */ 1737 void 1738 if_addr_rlock(struct ifnet *ifp) 1739 { 1740 1741 IF_ADDR_RLOCK(ifp); 1742 } 1743 1744 void 1745 if_addr_runlock(struct ifnet *ifp) 1746 { 1747 1748 IF_ADDR_RUNLOCK(ifp); 1749 } 1750 1751 void 1752 if_maddr_rlock(if_t ifp) 1753 { 1754 1755 IF_ADDR_RLOCK((struct ifnet *)ifp); 1756 } 1757 1758 void 1759 if_maddr_runlock(if_t ifp) 1760 { 1761 1762 IF_ADDR_RUNLOCK((struct ifnet *)ifp); 1763 } 1764 1765 /* 1766 * Initialization, destruction and refcounting functions for ifaddrs. 1767 */ 1768 struct ifaddr * 1769 ifa_alloc(size_t size, int flags) 1770 { 1771 struct ifaddr *ifa; 1772 1773 KASSERT(size >= sizeof(struct ifaddr), 1774 ("%s: invalid size %zu", __func__, size)); 1775 1776 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1777 if (ifa == NULL) 1778 return (NULL); 1779 1780 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1781 goto fail; 1782 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1783 goto fail; 1784 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1785 goto fail; 1786 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1787 goto fail; 1788 1789 refcount_init(&ifa->ifa_refcnt, 1); 1790 1791 return (ifa); 1792 1793 fail: 1794 /* free(NULL) is okay */ 1795 counter_u64_free(ifa->ifa_opackets); 1796 counter_u64_free(ifa->ifa_ipackets); 1797 counter_u64_free(ifa->ifa_obytes); 1798 counter_u64_free(ifa->ifa_ibytes); 1799 free(ifa, M_IFADDR); 1800 1801 return (NULL); 1802 } 1803 1804 void 1805 ifa_ref(struct ifaddr *ifa) 1806 { 1807 1808 refcount_acquire(&ifa->ifa_refcnt); 1809 } 1810 1811 static void 1812 ifa_destroy(epoch_context_t ctx) 1813 { 1814 struct ifaddr *ifa; 1815 1816 ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx); 1817 counter_u64_free(ifa->ifa_opackets); 1818 counter_u64_free(ifa->ifa_ipackets); 1819 counter_u64_free(ifa->ifa_obytes); 1820 counter_u64_free(ifa->ifa_ibytes); 1821 free(ifa, M_IFADDR); 1822 } 1823 1824 void 1825 ifa_free(struct ifaddr *ifa) 1826 { 1827 1828 if (refcount_release(&ifa->ifa_refcnt)) 1829 epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy); 1830 } 1831 1832 1833 static int 1834 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa, 1835 struct sockaddr *ia) 1836 { 1837 int error; 1838 struct rt_addrinfo info; 1839 struct sockaddr_dl null_sdl; 1840 struct ifnet *ifp; 1841 1842 ifp = ifa->ifa_ifp; 1843 1844 bzero(&info, sizeof(info)); 1845 if (cmd != RTM_DELETE) 1846 info.rti_ifp = V_loif; 1847 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 1848 info.rti_info[RTAX_DST] = ia; 1849 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1850 link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type); 1851 1852 error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib); 1853 1854 if (error != 0 && 1855 !(cmd == RTM_ADD && error == EEXIST) && 1856 !(cmd == RTM_DELETE && error == ENOENT)) 1857 if_printf(ifp, "%s failed: %d\n", otype, error); 1858 1859 return (error); 1860 } 1861 1862 int 1863 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1864 { 1865 1866 return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia)); 1867 } 1868 1869 int 1870 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1871 { 1872 1873 return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia)); 1874 } 1875 1876 int 1877 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1878 { 1879 1880 return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia)); 1881 } 1882 1883 /* 1884 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1885 * structs used to represent other address families, it is necessary 1886 * to perform a different comparison. 1887 */ 1888 1889 #define sa_dl_equal(a1, a2) \ 1890 ((((const struct sockaddr_dl *)(a1))->sdl_len == \ 1891 ((const struct sockaddr_dl *)(a2))->sdl_len) && \ 1892 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)), \ 1893 CLLADDR((const struct sockaddr_dl *)(a2)), \ 1894 ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1895 1896 /* 1897 * Locate an interface based on a complete address. 1898 */ 1899 /*ARGSUSED*/ 1900 static struct ifaddr * 1901 ifa_ifwithaddr_internal(const struct sockaddr *addr, int getref) 1902 { 1903 struct ifnet *ifp; 1904 struct ifaddr *ifa; 1905 1906 IFNET_RLOCK_NOSLEEP(); 1907 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1908 IF_ADDR_RLOCK(ifp); 1909 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1910 if (ifa->ifa_addr->sa_family != addr->sa_family) 1911 continue; 1912 if (sa_equal(addr, ifa->ifa_addr)) { 1913 if (getref) 1914 ifa_ref(ifa); 1915 IF_ADDR_RUNLOCK(ifp); 1916 goto done; 1917 } 1918 /* IP6 doesn't have broadcast */ 1919 if ((ifp->if_flags & IFF_BROADCAST) && 1920 ifa->ifa_broadaddr && 1921 ifa->ifa_broadaddr->sa_len != 0 && 1922 sa_equal(ifa->ifa_broadaddr, addr)) { 1923 if (getref) 1924 ifa_ref(ifa); 1925 IF_ADDR_RUNLOCK(ifp); 1926 goto done; 1927 } 1928 } 1929 IF_ADDR_RUNLOCK(ifp); 1930 } 1931 ifa = NULL; 1932 done: 1933 IFNET_RUNLOCK_NOSLEEP(); 1934 return (ifa); 1935 } 1936 1937 struct ifaddr * 1938 ifa_ifwithaddr(const struct sockaddr *addr) 1939 { 1940 1941 return (ifa_ifwithaddr_internal(addr, 1)); 1942 } 1943 1944 int 1945 ifa_ifwithaddr_check(const struct sockaddr *addr) 1946 { 1947 1948 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1949 } 1950 1951 /* 1952 * Locate an interface based on the broadcast address. 1953 */ 1954 /* ARGSUSED */ 1955 struct ifaddr * 1956 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum) 1957 { 1958 struct ifnet *ifp; 1959 struct ifaddr *ifa; 1960 1961 IFNET_RLOCK_NOSLEEP(); 1962 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1963 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1964 continue; 1965 IF_ADDR_RLOCK(ifp); 1966 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1967 if (ifa->ifa_addr->sa_family != addr->sa_family) 1968 continue; 1969 if ((ifp->if_flags & IFF_BROADCAST) && 1970 ifa->ifa_broadaddr && 1971 ifa->ifa_broadaddr->sa_len != 0 && 1972 sa_equal(ifa->ifa_broadaddr, addr)) { 1973 ifa_ref(ifa); 1974 IF_ADDR_RUNLOCK(ifp); 1975 goto done; 1976 } 1977 } 1978 IF_ADDR_RUNLOCK(ifp); 1979 } 1980 ifa = NULL; 1981 done: 1982 IFNET_RUNLOCK_NOSLEEP(); 1983 return (ifa); 1984 } 1985 1986 /* 1987 * Locate the point to point interface with a given destination address. 1988 */ 1989 /*ARGSUSED*/ 1990 struct ifaddr * 1991 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum) 1992 { 1993 struct ifnet *ifp; 1994 struct ifaddr *ifa; 1995 1996 IFNET_RLOCK_NOSLEEP(); 1997 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1998 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1999 continue; 2000 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2001 continue; 2002 IF_ADDR_RLOCK(ifp); 2003 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2004 if (ifa->ifa_addr->sa_family != addr->sa_family) 2005 continue; 2006 if (ifa->ifa_dstaddr != NULL && 2007 sa_equal(addr, ifa->ifa_dstaddr)) { 2008 ifa_ref(ifa); 2009 IF_ADDR_RUNLOCK(ifp); 2010 goto done; 2011 } 2012 } 2013 IF_ADDR_RUNLOCK(ifp); 2014 } 2015 ifa = NULL; 2016 done: 2017 IFNET_RUNLOCK_NOSLEEP(); 2018 return (ifa); 2019 } 2020 2021 /* 2022 * Find an interface on a specific network. If many, choice 2023 * is most specific found. 2024 */ 2025 struct ifaddr * 2026 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum) 2027 { 2028 struct ifnet *ifp; 2029 struct ifaddr *ifa; 2030 struct ifaddr *ifa_maybe = NULL; 2031 u_int af = addr->sa_family; 2032 const char *addr_data = addr->sa_data, *cplim; 2033 2034 /* 2035 * AF_LINK addresses can be looked up directly by their index number, 2036 * so do that if we can. 2037 */ 2038 if (af == AF_LINK) { 2039 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr; 2040 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 2041 return (ifaddr_byindex(sdl->sdl_index)); 2042 } 2043 2044 /* 2045 * Scan though each interface, looking for ones that have addresses 2046 * in this address family and the requested fib. Maintain a reference 2047 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 2048 * kept it stable when we move onto the next interface. 2049 */ 2050 IFNET_RLOCK_NOSLEEP(); 2051 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2052 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 2053 continue; 2054 IF_ADDR_RLOCK(ifp); 2055 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2056 const char *cp, *cp2, *cp3; 2057 2058 if (ifa->ifa_addr->sa_family != af) 2059 next: continue; 2060 if (af == AF_INET && 2061 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 2062 /* 2063 * This is a bit broken as it doesn't 2064 * take into account that the remote end may 2065 * be a single node in the network we are 2066 * looking for. 2067 * The trouble is that we don't know the 2068 * netmask for the remote end. 2069 */ 2070 if (ifa->ifa_dstaddr != NULL && 2071 sa_equal(addr, ifa->ifa_dstaddr)) { 2072 ifa_ref(ifa); 2073 IF_ADDR_RUNLOCK(ifp); 2074 goto done; 2075 } 2076 } else { 2077 /* 2078 * Scan all the bits in the ifa's address. 2079 * If a bit dissagrees with what we are 2080 * looking for, mask it with the netmask 2081 * to see if it really matters. 2082 * (A byte at a time) 2083 */ 2084 if (ifa->ifa_netmask == 0) 2085 continue; 2086 cp = addr_data; 2087 cp2 = ifa->ifa_addr->sa_data; 2088 cp3 = ifa->ifa_netmask->sa_data; 2089 cplim = ifa->ifa_netmask->sa_len 2090 + (char *)ifa->ifa_netmask; 2091 while (cp3 < cplim) 2092 if ((*cp++ ^ *cp2++) & *cp3++) 2093 goto next; /* next address! */ 2094 /* 2095 * If the netmask of what we just found 2096 * is more specific than what we had before 2097 * (if we had one), or if the virtual status 2098 * of new prefix is better than of the old one, 2099 * then remember the new one before continuing 2100 * to search for an even better one. 2101 */ 2102 if (ifa_maybe == NULL || 2103 ifa_preferred(ifa_maybe, ifa) || 2104 rn_refines((caddr_t)ifa->ifa_netmask, 2105 (caddr_t)ifa_maybe->ifa_netmask)) { 2106 if (ifa_maybe != NULL) 2107 ifa_free(ifa_maybe); 2108 ifa_maybe = ifa; 2109 ifa_ref(ifa_maybe); 2110 } 2111 } 2112 } 2113 IF_ADDR_RUNLOCK(ifp); 2114 } 2115 ifa = ifa_maybe; 2116 ifa_maybe = NULL; 2117 done: 2118 IFNET_RUNLOCK_NOSLEEP(); 2119 if (ifa_maybe != NULL) 2120 ifa_free(ifa_maybe); 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 IF_ADDR_RLOCK(ifp); 2140 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2141 if (ifa->ifa_addr->sa_family != af) 2142 continue; 2143 if (ifa_maybe == NULL) 2144 ifa_maybe = ifa; 2145 if (ifa->ifa_netmask == 0) { 2146 if (sa_equal(addr, ifa->ifa_addr) || 2147 (ifa->ifa_dstaddr && 2148 sa_equal(addr, ifa->ifa_dstaddr))) 2149 goto done; 2150 continue; 2151 } 2152 if (ifp->if_flags & IFF_POINTOPOINT) { 2153 if (sa_equal(addr, ifa->ifa_dstaddr)) 2154 goto done; 2155 } else { 2156 cp = addr->sa_data; 2157 cp2 = ifa->ifa_addr->sa_data; 2158 cp3 = ifa->ifa_netmask->sa_data; 2159 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 2160 for (; cp3 < cplim; cp3++) 2161 if ((*cp++ ^ *cp2++) & *cp3) 2162 break; 2163 if (cp3 == cplim) 2164 goto done; 2165 } 2166 } 2167 ifa = ifa_maybe; 2168 done: 2169 if (ifa != NULL) 2170 ifa_ref(ifa); 2171 IF_ADDR_RUNLOCK(ifp); 2172 return (ifa); 2173 } 2174 2175 /* 2176 * See whether new ifa is better than current one: 2177 * 1) A non-virtual one is preferred over virtual. 2178 * 2) A virtual in master state preferred over any other state. 2179 * 2180 * Used in several address selecting functions. 2181 */ 2182 int 2183 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 2184 { 2185 2186 return (cur->ifa_carp && (!next->ifa_carp || 2187 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 2188 } 2189 2190 #include <net/if_llatbl.h> 2191 2192 /* 2193 * Default action when installing a route with a Link Level gateway. 2194 * Lookup an appropriate real ifa to point to. 2195 * This should be moved to /sys/net/link.c eventually. 2196 */ 2197 static void 2198 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 2199 { 2200 struct ifaddr *ifa, *oifa; 2201 struct sockaddr *dst; 2202 struct ifnet *ifp; 2203 2204 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 2205 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_key(rt)) == NULL)) 2206 return; 2207 ifa = ifaof_ifpforaddr(dst, ifp); 2208 if (ifa) { 2209 oifa = rt->rt_ifa; 2210 rt->rt_ifa = ifa; 2211 ifa_free(oifa); 2212 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2213 ifa->ifa_rtrequest(cmd, rt, info); 2214 } 2215 } 2216 2217 struct sockaddr_dl * 2218 link_alloc_sdl(size_t size, int flags) 2219 { 2220 2221 return (malloc(size, M_TEMP, flags)); 2222 } 2223 2224 void 2225 link_free_sdl(struct sockaddr *sa) 2226 { 2227 free(sa, M_TEMP); 2228 } 2229 2230 /* 2231 * Fills in given sdl with interface basic info. 2232 * Returns pointer to filled sdl. 2233 */ 2234 struct sockaddr_dl * 2235 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2236 { 2237 struct sockaddr_dl *sdl; 2238 2239 sdl = (struct sockaddr_dl *)paddr; 2240 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2241 sdl->sdl_len = sizeof(struct sockaddr_dl); 2242 sdl->sdl_family = AF_LINK; 2243 sdl->sdl_index = ifp->if_index; 2244 sdl->sdl_type = iftype; 2245 2246 return (sdl); 2247 } 2248 2249 /* 2250 * Mark an interface down and notify protocols of 2251 * the transition. 2252 */ 2253 static void 2254 if_unroute(struct ifnet *ifp, int flag, int fam) 2255 { 2256 struct ifaddr *ifa; 2257 2258 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2259 2260 ifp->if_flags &= ~flag; 2261 getmicrotime(&ifp->if_lastchange); 2262 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2263 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2264 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2265 ifp->if_qflush(ifp); 2266 2267 if (ifp->if_carp) 2268 (*carp_linkstate_p)(ifp); 2269 rt_ifmsg(ifp); 2270 } 2271 2272 /* 2273 * Mark an interface up and notify protocols of 2274 * the transition. 2275 */ 2276 static void 2277 if_route(struct ifnet *ifp, int flag, int fam) 2278 { 2279 struct ifaddr *ifa; 2280 2281 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2282 2283 ifp->if_flags |= flag; 2284 getmicrotime(&ifp->if_lastchange); 2285 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2286 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2287 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2288 if (ifp->if_carp) 2289 (*carp_linkstate_p)(ifp); 2290 rt_ifmsg(ifp); 2291 #ifdef INET6 2292 in6_if_up(ifp); 2293 #endif 2294 } 2295 2296 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2297 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2298 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2299 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2300 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2301 int (*vlan_setcookie_p)(struct ifnet *, void *); 2302 void *(*vlan_cookie_p)(struct ifnet *); 2303 2304 /* 2305 * Handle a change in the interface link state. To avoid LORs 2306 * between driver lock and upper layer locks, as well as possible 2307 * recursions, we post event to taskqueue, and all job 2308 * is done in static do_link_state_change(). 2309 */ 2310 void 2311 if_link_state_change(struct ifnet *ifp, int link_state) 2312 { 2313 /* Return if state hasn't changed. */ 2314 if (ifp->if_link_state == link_state) 2315 return; 2316 2317 ifp->if_link_state = link_state; 2318 2319 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2320 } 2321 2322 static void 2323 do_link_state_change(void *arg, int pending) 2324 { 2325 struct ifnet *ifp = (struct ifnet *)arg; 2326 int link_state = ifp->if_link_state; 2327 CURVNET_SET(ifp->if_vnet); 2328 2329 /* Notify that the link state has changed. */ 2330 rt_ifmsg(ifp); 2331 if (ifp->if_vlantrunk != NULL) 2332 (*vlan_link_state_p)(ifp); 2333 2334 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2335 ifp->if_l2com != NULL) 2336 (*ng_ether_link_state_p)(ifp, link_state); 2337 if (ifp->if_carp) 2338 (*carp_linkstate_p)(ifp); 2339 if (ifp->if_bridge) 2340 ifp->if_bridge_linkstate(ifp); 2341 if (ifp->if_lagg) 2342 (*lagg_linkstate_p)(ifp, link_state); 2343 2344 if (IS_DEFAULT_VNET(curvnet)) 2345 devctl_notify("IFNET", ifp->if_xname, 2346 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2347 NULL); 2348 if (pending > 1) 2349 if_printf(ifp, "%d link states coalesced\n", pending); 2350 if (log_link_state_change) 2351 if_printf(ifp, "link state changed to %s\n", 2352 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2353 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state); 2354 CURVNET_RESTORE(); 2355 } 2356 2357 /* 2358 * Mark an interface down and notify protocols of 2359 * the transition. 2360 */ 2361 void 2362 if_down(struct ifnet *ifp) 2363 { 2364 2365 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN); 2366 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2367 } 2368 2369 /* 2370 * Mark an interface up and notify protocols of 2371 * the transition. 2372 */ 2373 void 2374 if_up(struct ifnet *ifp) 2375 { 2376 2377 if_route(ifp, IFF_UP, AF_UNSPEC); 2378 EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP); 2379 } 2380 2381 /* 2382 * Flush an interface queue. 2383 */ 2384 void 2385 if_qflush(struct ifnet *ifp) 2386 { 2387 struct mbuf *m, *n; 2388 struct ifaltq *ifq; 2389 2390 ifq = &ifp->if_snd; 2391 IFQ_LOCK(ifq); 2392 #ifdef ALTQ 2393 if (ALTQ_IS_ENABLED(ifq)) 2394 ALTQ_PURGE(ifq); 2395 #endif 2396 n = ifq->ifq_head; 2397 while ((m = n) != NULL) { 2398 n = m->m_nextpkt; 2399 m_freem(m); 2400 } 2401 ifq->ifq_head = 0; 2402 ifq->ifq_tail = 0; 2403 ifq->ifq_len = 0; 2404 IFQ_UNLOCK(ifq); 2405 } 2406 2407 /* 2408 * Map interface name to interface structure pointer, with or without 2409 * returning a reference. 2410 */ 2411 struct ifnet * 2412 ifunit_ref(const char *name) 2413 { 2414 struct ifnet *ifp; 2415 2416 IFNET_RLOCK_NOSLEEP(); 2417 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2418 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2419 !(ifp->if_flags & IFF_DYING)) 2420 break; 2421 } 2422 if (ifp != NULL) 2423 if_ref(ifp); 2424 IFNET_RUNLOCK_NOSLEEP(); 2425 return (ifp); 2426 } 2427 2428 struct ifnet * 2429 ifunit(const char *name) 2430 { 2431 struct ifnet *ifp; 2432 2433 IFNET_RLOCK_NOSLEEP(); 2434 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2435 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2436 break; 2437 } 2438 IFNET_RUNLOCK_NOSLEEP(); 2439 return (ifp); 2440 } 2441 2442 static void * 2443 ifr_buffer_get_buffer(void *data) 2444 { 2445 union ifreq_union *ifrup; 2446 2447 ifrup = data; 2448 #ifdef COMPAT_FREEBSD32 2449 if (SV_CURPROC_FLAG(SV_ILP32)) 2450 return ((void *)(uintptr_t) 2451 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer); 2452 #endif 2453 return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer); 2454 } 2455 2456 static void 2457 ifr_buffer_set_buffer_null(void *data) 2458 { 2459 union ifreq_union *ifrup; 2460 2461 ifrup = data; 2462 #ifdef COMPAT_FREEBSD32 2463 if (SV_CURPROC_FLAG(SV_ILP32)) 2464 ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0; 2465 else 2466 #endif 2467 ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL; 2468 } 2469 2470 static size_t 2471 ifr_buffer_get_length(void *data) 2472 { 2473 union ifreq_union *ifrup; 2474 2475 ifrup = data; 2476 #ifdef COMPAT_FREEBSD32 2477 if (SV_CURPROC_FLAG(SV_ILP32)) 2478 return (ifrup->ifr32.ifr_ifru.ifru_buffer.length); 2479 #endif 2480 return (ifrup->ifr.ifr_ifru.ifru_buffer.length); 2481 } 2482 2483 static void 2484 ifr_buffer_set_length(void *data, size_t len) 2485 { 2486 union ifreq_union *ifrup; 2487 2488 ifrup = data; 2489 #ifdef COMPAT_FREEBSD32 2490 if (SV_CURPROC_FLAG(SV_ILP32)) 2491 ifrup->ifr32.ifr_ifru.ifru_buffer.length = len; 2492 else 2493 #endif 2494 ifrup->ifr.ifr_ifru.ifru_buffer.length = len; 2495 } 2496 2497 void * 2498 ifr_data_get_ptr(void *ifrp) 2499 { 2500 union ifreq_union *ifrup; 2501 2502 ifrup = ifrp; 2503 #ifdef COMPAT_FREEBSD32 2504 if (SV_CURPROC_FLAG(SV_ILP32)) 2505 return ((void *)(uintptr_t) 2506 ifrup->ifr32.ifr_ifru.ifru_data); 2507 #endif 2508 return (ifrup->ifr.ifr_ifru.ifru_data); 2509 } 2510 2511 /* 2512 * Hardware specific interface ioctls. 2513 */ 2514 static int 2515 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2516 { 2517 struct ifreq *ifr; 2518 int error = 0, do_ifup = 0; 2519 int new_flags, temp_flags; 2520 size_t namelen, onamelen; 2521 size_t descrlen; 2522 char *descrbuf, *odescrbuf; 2523 char new_name[IFNAMSIZ]; 2524 struct ifaddr *ifa; 2525 struct sockaddr_dl *sdl; 2526 2527 ifr = (struct ifreq *)data; 2528 switch (cmd) { 2529 case SIOCGIFINDEX: 2530 ifr->ifr_index = ifp->if_index; 2531 break; 2532 2533 case SIOCGIFFLAGS: 2534 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2535 ifr->ifr_flags = temp_flags & 0xffff; 2536 ifr->ifr_flagshigh = temp_flags >> 16; 2537 break; 2538 2539 case SIOCGIFCAP: 2540 ifr->ifr_reqcap = ifp->if_capabilities; 2541 ifr->ifr_curcap = ifp->if_capenable; 2542 break; 2543 2544 #ifdef MAC 2545 case SIOCGIFMAC: 2546 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2547 break; 2548 #endif 2549 2550 case SIOCGIFMETRIC: 2551 ifr->ifr_metric = ifp->if_metric; 2552 break; 2553 2554 case SIOCGIFMTU: 2555 ifr->ifr_mtu = ifp->if_mtu; 2556 break; 2557 2558 case SIOCGIFPHYS: 2559 /* XXXGL: did this ever worked? */ 2560 ifr->ifr_phys = 0; 2561 break; 2562 2563 case SIOCGIFDESCR: 2564 error = 0; 2565 sx_slock(&ifdescr_sx); 2566 if (ifp->if_description == NULL) 2567 error = ENOMSG; 2568 else { 2569 /* space for terminating nul */ 2570 descrlen = strlen(ifp->if_description) + 1; 2571 if (ifr_buffer_get_length(ifr) < descrlen) 2572 ifr_buffer_set_buffer_null(ifr); 2573 else 2574 error = copyout(ifp->if_description, 2575 ifr_buffer_get_buffer(ifr), descrlen); 2576 ifr_buffer_set_length(ifr, descrlen); 2577 } 2578 sx_sunlock(&ifdescr_sx); 2579 break; 2580 2581 case SIOCSIFDESCR: 2582 error = priv_check(td, PRIV_NET_SETIFDESCR); 2583 if (error) 2584 return (error); 2585 2586 /* 2587 * Copy only (length-1) bytes to make sure that 2588 * if_description is always nul terminated. The 2589 * length parameter is supposed to count the 2590 * terminating nul in. 2591 */ 2592 if (ifr_buffer_get_length(ifr) > ifdescr_maxlen) 2593 return (ENAMETOOLONG); 2594 else if (ifr_buffer_get_length(ifr) == 0) 2595 descrbuf = NULL; 2596 else { 2597 descrbuf = malloc(ifr_buffer_get_length(ifr), 2598 M_IFDESCR, M_WAITOK | M_ZERO); 2599 error = copyin(ifr_buffer_get_buffer(ifr), descrbuf, 2600 ifr_buffer_get_length(ifr) - 1); 2601 if (error) { 2602 free(descrbuf, M_IFDESCR); 2603 break; 2604 } 2605 } 2606 2607 sx_xlock(&ifdescr_sx); 2608 odescrbuf = ifp->if_description; 2609 ifp->if_description = descrbuf; 2610 sx_xunlock(&ifdescr_sx); 2611 2612 getmicrotime(&ifp->if_lastchange); 2613 free(odescrbuf, M_IFDESCR); 2614 break; 2615 2616 case SIOCGIFFIB: 2617 ifr->ifr_fib = ifp->if_fib; 2618 break; 2619 2620 case SIOCSIFFIB: 2621 error = priv_check(td, PRIV_NET_SETIFFIB); 2622 if (error) 2623 return (error); 2624 if (ifr->ifr_fib >= rt_numfibs) 2625 return (EINVAL); 2626 2627 ifp->if_fib = ifr->ifr_fib; 2628 break; 2629 2630 case SIOCSIFFLAGS: 2631 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2632 if (error) 2633 return (error); 2634 /* 2635 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2636 * check, so we don't need special handling here yet. 2637 */ 2638 new_flags = (ifr->ifr_flags & 0xffff) | 2639 (ifr->ifr_flagshigh << 16); 2640 if (ifp->if_flags & IFF_UP && 2641 (new_flags & IFF_UP) == 0) { 2642 if_down(ifp); 2643 } else if (new_flags & IFF_UP && 2644 (ifp->if_flags & IFF_UP) == 0) { 2645 do_ifup = 1; 2646 } 2647 /* See if permanently promiscuous mode bit is about to flip */ 2648 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2649 if (new_flags & IFF_PPROMISC) 2650 ifp->if_flags |= IFF_PROMISC; 2651 else if (ifp->if_pcount == 0) 2652 ifp->if_flags &= ~IFF_PROMISC; 2653 if (log_promisc_mode_change) 2654 if_printf(ifp, "permanently promiscuous mode %s\n", 2655 ((new_flags & IFF_PPROMISC) ? 2656 "enabled" : "disabled")); 2657 } 2658 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2659 (new_flags &~ IFF_CANTCHANGE); 2660 if (ifp->if_ioctl) { 2661 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2662 } 2663 if (do_ifup) 2664 if_up(ifp); 2665 getmicrotime(&ifp->if_lastchange); 2666 break; 2667 2668 case SIOCSIFCAP: 2669 error = priv_check(td, PRIV_NET_SETIFCAP); 2670 if (error) 2671 return (error); 2672 if (ifp->if_ioctl == NULL) 2673 return (EOPNOTSUPP); 2674 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2675 return (EINVAL); 2676 error = (*ifp->if_ioctl)(ifp, cmd, data); 2677 if (error == 0) 2678 getmicrotime(&ifp->if_lastchange); 2679 break; 2680 2681 #ifdef MAC 2682 case SIOCSIFMAC: 2683 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2684 break; 2685 #endif 2686 2687 case SIOCSIFNAME: 2688 error = priv_check(td, PRIV_NET_SETIFNAME); 2689 if (error) 2690 return (error); 2691 error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ, 2692 NULL); 2693 if (error != 0) 2694 return (error); 2695 if (new_name[0] == '\0') 2696 return (EINVAL); 2697 if (new_name[IFNAMSIZ-1] != '\0') { 2698 new_name[IFNAMSIZ-1] = '\0'; 2699 if (strlen(new_name) == IFNAMSIZ-1) 2700 return (EINVAL); 2701 } 2702 if (ifunit(new_name) != NULL) 2703 return (EEXIST); 2704 2705 /* 2706 * XXX: Locking. Nothing else seems to lock if_flags, 2707 * and there are numerous other races with the 2708 * ifunit() checks not being atomic with namespace 2709 * changes (renames, vmoves, if_attach, etc). 2710 */ 2711 ifp->if_flags |= IFF_RENAMING; 2712 2713 /* Announce the departure of the interface. */ 2714 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2715 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2716 2717 if_printf(ifp, "changing name to '%s'\n", new_name); 2718 2719 IF_ADDR_WLOCK(ifp); 2720 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2721 ifa = ifp->if_addr; 2722 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2723 namelen = strlen(new_name); 2724 onamelen = sdl->sdl_nlen; 2725 /* 2726 * Move the address if needed. This is safe because we 2727 * allocate space for a name of length IFNAMSIZ when we 2728 * create this in if_attach(). 2729 */ 2730 if (namelen != onamelen) { 2731 bcopy(sdl->sdl_data + onamelen, 2732 sdl->sdl_data + namelen, sdl->sdl_alen); 2733 } 2734 bcopy(new_name, sdl->sdl_data, namelen); 2735 sdl->sdl_nlen = namelen; 2736 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2737 bzero(sdl->sdl_data, onamelen); 2738 while (namelen != 0) 2739 sdl->sdl_data[--namelen] = 0xff; 2740 IF_ADDR_WUNLOCK(ifp); 2741 2742 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2743 /* Announce the return of the interface. */ 2744 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2745 2746 ifp->if_flags &= ~IFF_RENAMING; 2747 break; 2748 2749 #ifdef VIMAGE 2750 case SIOCSIFVNET: 2751 error = priv_check(td, PRIV_NET_SETIFVNET); 2752 if (error) 2753 return (error); 2754 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2755 break; 2756 #endif 2757 2758 case SIOCSIFMETRIC: 2759 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2760 if (error) 2761 return (error); 2762 ifp->if_metric = ifr->ifr_metric; 2763 getmicrotime(&ifp->if_lastchange); 2764 break; 2765 2766 case SIOCSIFPHYS: 2767 error = priv_check(td, PRIV_NET_SETIFPHYS); 2768 if (error) 2769 return (error); 2770 if (ifp->if_ioctl == NULL) 2771 return (EOPNOTSUPP); 2772 error = (*ifp->if_ioctl)(ifp, cmd, data); 2773 if (error == 0) 2774 getmicrotime(&ifp->if_lastchange); 2775 break; 2776 2777 case SIOCSIFMTU: 2778 { 2779 u_long oldmtu = ifp->if_mtu; 2780 2781 error = priv_check(td, PRIV_NET_SETIFMTU); 2782 if (error) 2783 return (error); 2784 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2785 return (EINVAL); 2786 if (ifp->if_ioctl == NULL) 2787 return (EOPNOTSUPP); 2788 error = (*ifp->if_ioctl)(ifp, cmd, data); 2789 if (error == 0) { 2790 getmicrotime(&ifp->if_lastchange); 2791 rt_ifmsg(ifp); 2792 #ifdef INET 2793 NETDUMP_REINIT(ifp); 2794 #endif 2795 } 2796 /* 2797 * If the link MTU changed, do network layer specific procedure. 2798 */ 2799 if (ifp->if_mtu != oldmtu) { 2800 #ifdef INET6 2801 nd6_setmtu(ifp); 2802 #endif 2803 rt_updatemtu(ifp); 2804 } 2805 break; 2806 } 2807 2808 case SIOCADDMULTI: 2809 case SIOCDELMULTI: 2810 if (cmd == SIOCADDMULTI) 2811 error = priv_check(td, PRIV_NET_ADDMULTI); 2812 else 2813 error = priv_check(td, PRIV_NET_DELMULTI); 2814 if (error) 2815 return (error); 2816 2817 /* Don't allow group membership on non-multicast interfaces. */ 2818 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2819 return (EOPNOTSUPP); 2820 2821 /* Don't let users screw up protocols' entries. */ 2822 if (ifr->ifr_addr.sa_family != AF_LINK) 2823 return (EINVAL); 2824 2825 if (cmd == SIOCADDMULTI) { 2826 struct ifmultiaddr *ifma; 2827 2828 /* 2829 * Userland is only permitted to join groups once 2830 * via the if_addmulti() KPI, because it cannot hold 2831 * struct ifmultiaddr * between calls. It may also 2832 * lose a race while we check if the membership 2833 * already exists. 2834 */ 2835 IF_ADDR_RLOCK(ifp); 2836 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2837 IF_ADDR_RUNLOCK(ifp); 2838 if (ifma != NULL) 2839 error = EADDRINUSE; 2840 else 2841 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2842 } else { 2843 error = if_delmulti(ifp, &ifr->ifr_addr); 2844 } 2845 if (error == 0) 2846 getmicrotime(&ifp->if_lastchange); 2847 break; 2848 2849 case SIOCSIFPHYADDR: 2850 case SIOCDIFPHYADDR: 2851 #ifdef INET6 2852 case SIOCSIFPHYADDR_IN6: 2853 #endif 2854 case SIOCSIFMEDIA: 2855 case SIOCSIFGENERIC: 2856 error = priv_check(td, PRIV_NET_HWIOCTL); 2857 if (error) 2858 return (error); 2859 if (ifp->if_ioctl == NULL) 2860 return (EOPNOTSUPP); 2861 error = (*ifp->if_ioctl)(ifp, cmd, data); 2862 if (error == 0) 2863 getmicrotime(&ifp->if_lastchange); 2864 break; 2865 2866 case SIOCGIFSTATUS: 2867 case SIOCGIFPSRCADDR: 2868 case SIOCGIFPDSTADDR: 2869 case SIOCGIFMEDIA: 2870 case SIOCGIFXMEDIA: 2871 case SIOCGIFGENERIC: 2872 case SIOCGIFRSSKEY: 2873 case SIOCGIFRSSHASH: 2874 if (ifp->if_ioctl == NULL) 2875 return (EOPNOTSUPP); 2876 error = (*ifp->if_ioctl)(ifp, cmd, data); 2877 break; 2878 2879 case SIOCSIFLLADDR: 2880 error = priv_check(td, PRIV_NET_SETLLADDR); 2881 if (error) 2882 return (error); 2883 error = if_setlladdr(ifp, 2884 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2885 break; 2886 2887 case SIOCGHWADDR: 2888 error = if_gethwaddr(ifp, ifr); 2889 break; 2890 2891 CASE_IOC_IFGROUPREQ(SIOCAIFGROUP): 2892 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2893 if (error) 2894 return (error); 2895 if ((error = if_addgroup(ifp, 2896 ifgr_group_get((struct ifgroupreq *)data)))) 2897 return (error); 2898 break; 2899 2900 CASE_IOC_IFGROUPREQ(SIOCGIFGROUP): 2901 if ((error = if_getgroup((struct ifgroupreq *)data, ifp))) 2902 return (error); 2903 break; 2904 2905 CASE_IOC_IFGROUPREQ(SIOCDIFGROUP): 2906 error = priv_check(td, PRIV_NET_DELIFGROUP); 2907 if (error) 2908 return (error); 2909 if ((error = if_delgroup(ifp, 2910 ifgr_group_get((struct ifgroupreq *)data)))) 2911 return (error); 2912 break; 2913 2914 default: 2915 error = ENOIOCTL; 2916 break; 2917 } 2918 return (error); 2919 } 2920 2921 #ifdef COMPAT_FREEBSD32 2922 struct ifconf32 { 2923 int32_t ifc_len; 2924 union { 2925 uint32_t ifcu_buf; 2926 uint32_t ifcu_req; 2927 } ifc_ifcu; 2928 }; 2929 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2930 #endif 2931 2932 #ifdef COMPAT_FREEBSD32 2933 static void 2934 ifmr_init(struct ifmediareq *ifmr, caddr_t data) 2935 { 2936 struct ifmediareq32 *ifmr32; 2937 2938 ifmr32 = (struct ifmediareq32 *)data; 2939 memcpy(ifmr->ifm_name, ifmr32->ifm_name, 2940 sizeof(ifmr->ifm_name)); 2941 ifmr->ifm_current = ifmr32->ifm_current; 2942 ifmr->ifm_mask = ifmr32->ifm_mask; 2943 ifmr->ifm_status = ifmr32->ifm_status; 2944 ifmr->ifm_active = ifmr32->ifm_active; 2945 ifmr->ifm_count = ifmr32->ifm_count; 2946 ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist; 2947 } 2948 2949 static void 2950 ifmr_update(const struct ifmediareq *ifmr, caddr_t data) 2951 { 2952 struct ifmediareq32 *ifmr32; 2953 2954 ifmr32 = (struct ifmediareq32 *)data; 2955 ifmr32->ifm_current = ifmr->ifm_current; 2956 ifmr32->ifm_mask = ifmr->ifm_mask; 2957 ifmr32->ifm_status = ifmr->ifm_status; 2958 ifmr32->ifm_active = ifmr->ifm_active; 2959 ifmr32->ifm_count = ifmr->ifm_count; 2960 } 2961 #endif 2962 2963 /* 2964 * Interface ioctls. 2965 */ 2966 int 2967 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2968 { 2969 #ifdef COMPAT_FREEBSD32 2970 caddr_t saved_data = NULL; 2971 struct ifmediareq ifmr; 2972 #endif 2973 struct ifmediareq *ifmrp; 2974 struct ifnet *ifp; 2975 struct ifreq *ifr; 2976 int error; 2977 int oif_flags; 2978 #ifdef VIMAGE 2979 int shutdown; 2980 #endif 2981 2982 CURVNET_SET(so->so_vnet); 2983 #ifdef VIMAGE 2984 /* Make sure the VNET is stable. */ 2985 shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET && 2986 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0; 2987 if (shutdown) { 2988 CURVNET_RESTORE(); 2989 return (EBUSY); 2990 } 2991 #endif 2992 2993 2994 switch (cmd) { 2995 case SIOCGIFCONF: 2996 error = ifconf(cmd, data); 2997 CURVNET_RESTORE(); 2998 return (error); 2999 3000 #ifdef COMPAT_FREEBSD32 3001 case SIOCGIFCONF32: 3002 { 3003 struct ifconf32 *ifc32; 3004 struct ifconf ifc; 3005 3006 ifc32 = (struct ifconf32 *)data; 3007 ifc.ifc_len = ifc32->ifc_len; 3008 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 3009 3010 error = ifconf(SIOCGIFCONF, (void *)&ifc); 3011 CURVNET_RESTORE(); 3012 if (error == 0) 3013 ifc32->ifc_len = ifc.ifc_len; 3014 return (error); 3015 } 3016 #endif 3017 } 3018 3019 ifmrp = NULL; 3020 #ifdef COMPAT_FREEBSD32 3021 switch (cmd) { 3022 case SIOCGIFMEDIA32: 3023 case SIOCGIFXMEDIA32: 3024 ifmrp = &ifmr; 3025 ifmr_init(ifmrp, data); 3026 cmd = _IOC_NEWTYPE(cmd, struct ifmediareq); 3027 saved_data = data; 3028 data = (caddr_t)ifmrp; 3029 } 3030 #endif 3031 3032 ifr = (struct ifreq *)data; 3033 switch (cmd) { 3034 #ifdef VIMAGE 3035 case SIOCSIFRVNET: 3036 error = priv_check(td, PRIV_NET_SETIFVNET); 3037 if (error == 0) 3038 error = if_vmove_reclaim(td, ifr->ifr_name, 3039 ifr->ifr_jid); 3040 goto out_noref; 3041 #endif 3042 case SIOCIFCREATE: 3043 case SIOCIFCREATE2: 3044 error = priv_check(td, PRIV_NET_IFCREATE); 3045 if (error == 0) 3046 error = if_clone_create(ifr->ifr_name, 3047 sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? 3048 ifr_data_get_ptr(ifr) : NULL); 3049 goto out_noref; 3050 case SIOCIFDESTROY: 3051 error = priv_check(td, PRIV_NET_IFDESTROY); 3052 if (error == 0) 3053 error = if_clone_destroy(ifr->ifr_name); 3054 goto out_noref; 3055 3056 case SIOCIFGCLONERS: 3057 error = if_clone_list((struct if_clonereq *)data); 3058 goto out_noref; 3059 3060 CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB): 3061 error = if_getgroupmembers((struct ifgroupreq *)data); 3062 goto out_noref; 3063 3064 #if defined(INET) || defined(INET6) 3065 case SIOCSVH: 3066 case SIOCGVH: 3067 if (carp_ioctl_p == NULL) 3068 error = EPROTONOSUPPORT; 3069 else 3070 error = (*carp_ioctl_p)(ifr, cmd, td); 3071 goto out_noref; 3072 #endif 3073 } 3074 3075 ifp = ifunit_ref(ifr->ifr_name); 3076 if (ifp == NULL) { 3077 error = ENXIO; 3078 goto out_noref; 3079 } 3080 3081 error = ifhwioctl(cmd, ifp, data, td); 3082 if (error != ENOIOCTL) 3083 goto out_ref; 3084 3085 oif_flags = ifp->if_flags; 3086 if (so->so_proto == NULL) { 3087 error = EOPNOTSUPP; 3088 goto out_ref; 3089 } 3090 3091 /* 3092 * Pass the request on to the socket control method, and if the 3093 * latter returns EOPNOTSUPP, directly to the interface. 3094 * 3095 * Make an exception for the legacy SIOCSIF* requests. Drivers 3096 * trust SIOCSIFADDR et al to come from an already privileged 3097 * layer, and do not perform any credentials checks or input 3098 * validation. 3099 */ 3100 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 3101 ifp, td)); 3102 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 3103 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 3104 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 3105 error = (*ifp->if_ioctl)(ifp, cmd, data); 3106 3107 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 3108 #ifdef INET6 3109 if (ifp->if_flags & IFF_UP) 3110 in6_if_up(ifp); 3111 #endif 3112 } 3113 3114 out_ref: 3115 if_rele(ifp); 3116 out_noref: 3117 #ifdef COMPAT_FREEBSD32 3118 if (ifmrp != NULL) { 3119 KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA), 3120 ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx", 3121 cmd)); 3122 data = saved_data; 3123 ifmr_update(ifmrp, data); 3124 } 3125 #endif 3126 CURVNET_RESTORE(); 3127 return (error); 3128 } 3129 3130 /* 3131 * The code common to handling reference counted flags, 3132 * e.g., in ifpromisc() and if_allmulti(). 3133 * The "pflag" argument can specify a permanent mode flag to check, 3134 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 3135 * 3136 * Only to be used on stack-owned flags, not driver-owned flags. 3137 */ 3138 static int 3139 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 3140 { 3141 struct ifreq ifr; 3142 int error; 3143 int oldflags, oldcount; 3144 3145 /* Sanity checks to catch programming errors */ 3146 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 3147 ("%s: setting driver-owned flag %d", __func__, flag)); 3148 3149 if (onswitch) 3150 KASSERT(*refcount >= 0, 3151 ("%s: increment negative refcount %d for flag %d", 3152 __func__, *refcount, flag)); 3153 else 3154 KASSERT(*refcount > 0, 3155 ("%s: decrement non-positive refcount %d for flag %d", 3156 __func__, *refcount, flag)); 3157 3158 /* In case this mode is permanent, just touch refcount */ 3159 if (ifp->if_flags & pflag) { 3160 *refcount += onswitch ? 1 : -1; 3161 return (0); 3162 } 3163 3164 /* Save ifnet parameters for if_ioctl() may fail */ 3165 oldcount = *refcount; 3166 oldflags = ifp->if_flags; 3167 3168 /* 3169 * See if we aren't the only and touching refcount is enough. 3170 * Actually toggle interface flag if we are the first or last. 3171 */ 3172 if (onswitch) { 3173 if ((*refcount)++) 3174 return (0); 3175 ifp->if_flags |= flag; 3176 } else { 3177 if (--(*refcount)) 3178 return (0); 3179 ifp->if_flags &= ~flag; 3180 } 3181 3182 /* Call down the driver since we've changed interface flags */ 3183 if (ifp->if_ioctl == NULL) { 3184 error = EOPNOTSUPP; 3185 goto recover; 3186 } 3187 ifr.ifr_flags = ifp->if_flags & 0xffff; 3188 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3189 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3190 if (error) 3191 goto recover; 3192 /* Notify userland that interface flags have changed */ 3193 rt_ifmsg(ifp); 3194 return (0); 3195 3196 recover: 3197 /* Recover after driver error */ 3198 *refcount = oldcount; 3199 ifp->if_flags = oldflags; 3200 return (error); 3201 } 3202 3203 /* 3204 * Set/clear promiscuous mode on interface ifp based on the truth value 3205 * of pswitch. The calls are reference counted so that only the first 3206 * "on" request actually has an effect, as does the final "off" request. 3207 * Results are undefined if the "off" and "on" requests are not matched. 3208 */ 3209 int 3210 ifpromisc(struct ifnet *ifp, int pswitch) 3211 { 3212 int error; 3213 int oldflags = ifp->if_flags; 3214 3215 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 3216 &ifp->if_pcount, pswitch); 3217 /* If promiscuous mode status has changed, log a message */ 3218 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) && 3219 log_promisc_mode_change) 3220 if_printf(ifp, "promiscuous mode %s\n", 3221 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 3222 return (error); 3223 } 3224 3225 /* 3226 * Return interface configuration 3227 * of system. List may be used 3228 * in later ioctl's (above) to get 3229 * other information. 3230 */ 3231 /*ARGSUSED*/ 3232 static int 3233 ifconf(u_long cmd, caddr_t data) 3234 { 3235 struct ifconf *ifc = (struct ifconf *)data; 3236 struct ifnet *ifp; 3237 struct ifaddr *ifa; 3238 struct ifreq ifr; 3239 struct sbuf *sb; 3240 int error, full = 0, valid_len, max_len; 3241 3242 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 3243 max_len = MAXPHYS - 1; 3244 3245 /* Prevent hostile input from being able to crash the system */ 3246 if (ifc->ifc_len <= 0) 3247 return (EINVAL); 3248 3249 again: 3250 if (ifc->ifc_len <= max_len) { 3251 max_len = ifc->ifc_len; 3252 full = 1; 3253 } 3254 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 3255 max_len = 0; 3256 valid_len = 0; 3257 3258 IFNET_RLOCK(); 3259 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 3260 int addrs; 3261 3262 /* 3263 * Zero the ifr to make sure we don't disclose the contents 3264 * of the stack. 3265 */ 3266 memset(&ifr, 0, sizeof(ifr)); 3267 3268 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 3269 >= sizeof(ifr.ifr_name)) { 3270 sbuf_delete(sb); 3271 IFNET_RUNLOCK(); 3272 return (ENAMETOOLONG); 3273 } 3274 3275 addrs = 0; 3276 IF_ADDR_RLOCK(ifp); 3277 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3278 struct sockaddr *sa = ifa->ifa_addr; 3279 3280 if (prison_if(curthread->td_ucred, sa) != 0) 3281 continue; 3282 addrs++; 3283 if (sa->sa_len <= sizeof(*sa)) { 3284 if (sa->sa_len < sizeof(*sa)) { 3285 memset(&ifr.ifr_ifru.ifru_addr, 0, 3286 sizeof(ifr.ifr_ifru.ifru_addr)); 3287 memcpy(&ifr.ifr_ifru.ifru_addr, sa, 3288 sa->sa_len); 3289 } else 3290 ifr.ifr_ifru.ifru_addr = *sa; 3291 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3292 max_len += sizeof(ifr); 3293 } else { 3294 sbuf_bcat(sb, &ifr, 3295 offsetof(struct ifreq, ifr_addr)); 3296 max_len += offsetof(struct ifreq, ifr_addr); 3297 sbuf_bcat(sb, sa, sa->sa_len); 3298 max_len += sa->sa_len; 3299 } 3300 3301 if (sbuf_error(sb) == 0) 3302 valid_len = sbuf_len(sb); 3303 } 3304 IF_ADDR_RUNLOCK(ifp); 3305 if (addrs == 0) { 3306 sbuf_bcat(sb, &ifr, sizeof(ifr)); 3307 max_len += sizeof(ifr); 3308 3309 if (sbuf_error(sb) == 0) 3310 valid_len = sbuf_len(sb); 3311 } 3312 } 3313 IFNET_RUNLOCK(); 3314 3315 /* 3316 * If we didn't allocate enough space (uncommon), try again. If 3317 * we have already allocated as much space as we are allowed, 3318 * return what we've got. 3319 */ 3320 if (valid_len != max_len && !full) { 3321 sbuf_delete(sb); 3322 goto again; 3323 } 3324 3325 ifc->ifc_len = valid_len; 3326 sbuf_finish(sb); 3327 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 3328 sbuf_delete(sb); 3329 return (error); 3330 } 3331 3332 /* 3333 * Just like ifpromisc(), but for all-multicast-reception mode. 3334 */ 3335 int 3336 if_allmulti(struct ifnet *ifp, int onswitch) 3337 { 3338 3339 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 3340 } 3341 3342 struct ifmultiaddr * 3343 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa) 3344 { 3345 struct ifmultiaddr *ifma; 3346 3347 IF_ADDR_LOCK_ASSERT(ifp); 3348 3349 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 3350 if (sa->sa_family == AF_LINK) { 3351 if (sa_dl_equal(ifma->ifma_addr, sa)) 3352 break; 3353 } else { 3354 if (sa_equal(ifma->ifma_addr, sa)) 3355 break; 3356 } 3357 } 3358 3359 return ifma; 3360 } 3361 3362 /* 3363 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3364 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3365 * the ifnet multicast address list here, so the caller must do that and 3366 * other setup work (such as notifying the device driver). The reference 3367 * count is initialized to 1. 3368 */ 3369 static struct ifmultiaddr * 3370 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3371 int mflags) 3372 { 3373 struct ifmultiaddr *ifma; 3374 struct sockaddr *dupsa; 3375 3376 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3377 M_ZERO); 3378 if (ifma == NULL) 3379 return (NULL); 3380 3381 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3382 if (dupsa == NULL) { 3383 free(ifma, M_IFMADDR); 3384 return (NULL); 3385 } 3386 bcopy(sa, dupsa, sa->sa_len); 3387 ifma->ifma_addr = dupsa; 3388 3389 ifma->ifma_ifp = ifp; 3390 ifma->ifma_refcount = 1; 3391 ifma->ifma_protospec = NULL; 3392 3393 if (llsa == NULL) { 3394 ifma->ifma_lladdr = NULL; 3395 return (ifma); 3396 } 3397 3398 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3399 if (dupsa == NULL) { 3400 free(ifma->ifma_addr, M_IFMADDR); 3401 free(ifma, M_IFMADDR); 3402 return (NULL); 3403 } 3404 bcopy(llsa, dupsa, llsa->sa_len); 3405 ifma->ifma_lladdr = dupsa; 3406 3407 return (ifma); 3408 } 3409 3410 /* 3411 * if_freemulti: free ifmultiaddr structure and possibly attached related 3412 * addresses. The caller is responsible for implementing reference 3413 * counting, notifying the driver, handling routing messages, and releasing 3414 * any dependent link layer state. 3415 */ 3416 #ifdef MCAST_VERBOSE 3417 extern void kdb_backtrace(void); 3418 #endif 3419 static void 3420 if_freemulti_internal(struct ifmultiaddr *ifma) 3421 { 3422 3423 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3424 ifma->ifma_refcount)); 3425 3426 if (ifma->ifma_lladdr != NULL) 3427 free(ifma->ifma_lladdr, M_IFMADDR); 3428 #ifdef MCAST_VERBOSE 3429 kdb_backtrace(); 3430 printf("%s freeing ifma: %p\n", __func__, ifma); 3431 #endif 3432 free(ifma->ifma_addr, M_IFMADDR); 3433 free(ifma, M_IFMADDR); 3434 } 3435 3436 static void 3437 if_destroymulti(epoch_context_t ctx) 3438 { 3439 struct ifmultiaddr *ifma; 3440 3441 ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx); 3442 if_freemulti_internal(ifma); 3443 } 3444 3445 void 3446 if_freemulti(struct ifmultiaddr *ifma) 3447 { 3448 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d", 3449 ifma->ifma_refcount)); 3450 3451 epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti); 3452 } 3453 3454 3455 /* 3456 * Register an additional multicast address with a network interface. 3457 * 3458 * - If the address is already present, bump the reference count on the 3459 * address and return. 3460 * - If the address is not link-layer, look up a link layer address. 3461 * - Allocate address structures for one or both addresses, and attach to the 3462 * multicast address list on the interface. If automatically adding a link 3463 * layer address, the protocol address will own a reference to the link 3464 * layer address, to be freed when it is freed. 3465 * - Notify the network device driver of an addition to the multicast address 3466 * list. 3467 * 3468 * 'sa' points to caller-owned memory with the desired multicast address. 3469 * 3470 * 'retifma' will be used to return a pointer to the resulting multicast 3471 * address reference, if desired. 3472 */ 3473 int 3474 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3475 struct ifmultiaddr **retifma) 3476 { 3477 struct ifmultiaddr *ifma, *ll_ifma; 3478 struct sockaddr *llsa; 3479 struct sockaddr_dl sdl; 3480 int error; 3481 3482 #ifdef INET 3483 IN_MULTI_LIST_UNLOCK_ASSERT(); 3484 #endif 3485 #ifdef INET6 3486 IN6_MULTI_LIST_UNLOCK_ASSERT(); 3487 #endif 3488 /* 3489 * If the address is already present, return a new reference to it; 3490 * otherwise, allocate storage and set up a new address. 3491 */ 3492 IF_ADDR_WLOCK(ifp); 3493 ifma = if_findmulti(ifp, sa); 3494 if (ifma != NULL) { 3495 ifma->ifma_refcount++; 3496 if (retifma != NULL) 3497 *retifma = ifma; 3498 IF_ADDR_WUNLOCK(ifp); 3499 return (0); 3500 } 3501 3502 /* 3503 * The address isn't already present; resolve the protocol address 3504 * into a link layer address, and then look that up, bump its 3505 * refcount or allocate an ifma for that also. 3506 * Most link layer resolving functions returns address data which 3507 * fits inside default sockaddr_dl structure. However callback 3508 * can allocate another sockaddr structure, in that case we need to 3509 * free it later. 3510 */ 3511 llsa = NULL; 3512 ll_ifma = NULL; 3513 if (ifp->if_resolvemulti != NULL) { 3514 /* Provide called function with buffer size information */ 3515 sdl.sdl_len = sizeof(sdl); 3516 llsa = (struct sockaddr *)&sdl; 3517 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3518 if (error) 3519 goto unlock_out; 3520 } 3521 3522 /* 3523 * Allocate the new address. Don't hook it up yet, as we may also 3524 * need to allocate a link layer multicast address. 3525 */ 3526 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3527 if (ifma == NULL) { 3528 error = ENOMEM; 3529 goto free_llsa_out; 3530 } 3531 3532 /* 3533 * If a link layer address is found, we'll need to see if it's 3534 * already present in the address list, or allocate is as well. 3535 * When this block finishes, the link layer address will be on the 3536 * list. 3537 */ 3538 if (llsa != NULL) { 3539 ll_ifma = if_findmulti(ifp, llsa); 3540 if (ll_ifma == NULL) { 3541 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3542 if (ll_ifma == NULL) { 3543 --ifma->ifma_refcount; 3544 if_freemulti(ifma); 3545 error = ENOMEM; 3546 goto free_llsa_out; 3547 } 3548 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3549 ifma_link); 3550 } else 3551 ll_ifma->ifma_refcount++; 3552 ifma->ifma_llifma = ll_ifma; 3553 } 3554 3555 /* 3556 * We now have a new multicast address, ifma, and possibly a new or 3557 * referenced link layer address. Add the primary address to the 3558 * ifnet address list. 3559 */ 3560 CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3561 3562 if (retifma != NULL) 3563 *retifma = ifma; 3564 3565 /* 3566 * Must generate the message while holding the lock so that 'ifma' 3567 * pointer is still valid. 3568 */ 3569 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3570 IF_ADDR_WUNLOCK(ifp); 3571 3572 /* 3573 * We are certain we have added something, so call down to the 3574 * interface to let them know about it. 3575 */ 3576 if (ifp->if_ioctl != NULL) { 3577 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3578 } 3579 3580 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3581 link_free_sdl(llsa); 3582 3583 return (0); 3584 3585 free_llsa_out: 3586 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3587 link_free_sdl(llsa); 3588 3589 unlock_out: 3590 IF_ADDR_WUNLOCK(ifp); 3591 return (error); 3592 } 3593 3594 /* 3595 * Delete a multicast group membership by network-layer group address. 3596 * 3597 * Returns ENOENT if the entry could not be found. If ifp no longer 3598 * exists, results are undefined. This entry point should only be used 3599 * from subsystems which do appropriate locking to hold ifp for the 3600 * duration of the call. 3601 * Network-layer protocol domains must use if_delmulti_ifma(). 3602 */ 3603 int 3604 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3605 { 3606 struct ifmultiaddr *ifma; 3607 int lastref; 3608 #ifdef INVARIANTS 3609 struct ifnet *oifp; 3610 3611 IFNET_RLOCK_NOSLEEP(); 3612 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3613 if (ifp == oifp) 3614 break; 3615 if (ifp != oifp) 3616 ifp = NULL; 3617 IFNET_RUNLOCK_NOSLEEP(); 3618 3619 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3620 #endif 3621 if (ifp == NULL) 3622 return (ENOENT); 3623 3624 IF_ADDR_WLOCK(ifp); 3625 lastref = 0; 3626 ifma = if_findmulti(ifp, sa); 3627 if (ifma != NULL) 3628 lastref = if_delmulti_locked(ifp, ifma, 0); 3629 IF_ADDR_WUNLOCK(ifp); 3630 3631 if (ifma == NULL) 3632 return (ENOENT); 3633 3634 if (lastref && ifp->if_ioctl != NULL) { 3635 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3636 } 3637 3638 return (0); 3639 } 3640 3641 /* 3642 * Delete all multicast group membership for an interface. 3643 * Should be used to quickly flush all multicast filters. 3644 */ 3645 void 3646 if_delallmulti(struct ifnet *ifp) 3647 { 3648 struct ifmultiaddr *ifma; 3649 struct ifmultiaddr *next; 3650 3651 IF_ADDR_WLOCK(ifp); 3652 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3653 if_delmulti_locked(ifp, ifma, 0); 3654 IF_ADDR_WUNLOCK(ifp); 3655 } 3656 3657 void 3658 if_delmulti_ifma(struct ifmultiaddr *ifma) 3659 { 3660 if_delmulti_ifma_flags(ifma, 0); 3661 } 3662 3663 /* 3664 * Delete a multicast group membership by group membership pointer. 3665 * Network-layer protocol domains must use this routine. 3666 * 3667 * It is safe to call this routine if the ifp disappeared. 3668 */ 3669 void 3670 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags) 3671 { 3672 struct ifnet *ifp; 3673 int lastref; 3674 MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma); 3675 #ifdef INET 3676 IN_MULTI_LIST_UNLOCK_ASSERT(); 3677 #endif 3678 ifp = ifma->ifma_ifp; 3679 #ifdef DIAGNOSTIC 3680 if (ifp == NULL) { 3681 printf("%s: ifma_ifp seems to be detached\n", __func__); 3682 } else { 3683 struct ifnet *oifp; 3684 3685 IFNET_RLOCK_NOSLEEP(); 3686 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3687 if (ifp == oifp) 3688 break; 3689 if (ifp != oifp) { 3690 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3691 ifp = NULL; 3692 } 3693 IFNET_RUNLOCK_NOSLEEP(); 3694 } 3695 #endif 3696 /* 3697 * If and only if the ifnet instance exists: Acquire the address lock. 3698 */ 3699 if (ifp != NULL) 3700 IF_ADDR_WLOCK(ifp); 3701 3702 lastref = if_delmulti_locked(ifp, ifma, flags); 3703 3704 if (ifp != NULL) { 3705 /* 3706 * If and only if the ifnet instance exists: 3707 * Release the address lock. 3708 * If the group was left: update the hardware hash filter. 3709 */ 3710 IF_ADDR_WUNLOCK(ifp); 3711 if (lastref && ifp->if_ioctl != NULL) { 3712 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3713 } 3714 } 3715 } 3716 3717 /* 3718 * Perform deletion of network-layer and/or link-layer multicast address. 3719 * 3720 * Return 0 if the reference count was decremented. 3721 * Return 1 if the final reference was released, indicating that the 3722 * hardware hash filter should be reprogrammed. 3723 */ 3724 static int 3725 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3726 { 3727 struct ifmultiaddr *ll_ifma; 3728 3729 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3730 KASSERT(ifma->ifma_ifp == ifp, 3731 ("%s: inconsistent ifp %p", __func__, ifp)); 3732 IF_ADDR_WLOCK_ASSERT(ifp); 3733 } 3734 3735 ifp = ifma->ifma_ifp; 3736 MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : ""); 3737 3738 /* 3739 * If the ifnet is detaching, null out references to ifnet, 3740 * so that upper protocol layers will notice, and not attempt 3741 * to obtain locks for an ifnet which no longer exists. The 3742 * routing socket announcement must happen before the ifnet 3743 * instance is detached from the system. 3744 */ 3745 if (detaching) { 3746 #ifdef DIAGNOSTIC 3747 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3748 #endif 3749 /* 3750 * ifp may already be nulled out if we are being reentered 3751 * to delete the ll_ifma. 3752 */ 3753 if (ifp != NULL) { 3754 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3755 ifma->ifma_ifp = NULL; 3756 } 3757 } 3758 3759 if (--ifma->ifma_refcount > 0) 3760 return 0; 3761 3762 if (ifp != NULL && detaching == 0) 3763 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link); 3764 3765 /* 3766 * If this ifma is a network-layer ifma, a link-layer ifma may 3767 * have been associated with it. Release it first if so. 3768 */ 3769 ll_ifma = ifma->ifma_llifma; 3770 if (ll_ifma != NULL) { 3771 KASSERT(ifma->ifma_lladdr != NULL, 3772 ("%s: llifma w/o lladdr", __func__)); 3773 if (detaching) 3774 ll_ifma->ifma_ifp = NULL; /* XXX */ 3775 if (--ll_ifma->ifma_refcount == 0) { 3776 if (ifp != NULL) { 3777 CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr, 3778 ifma_link); 3779 } 3780 if_freemulti(ll_ifma); 3781 } 3782 } 3783 #ifdef INVARIANTS 3784 if (ifp) { 3785 struct ifmultiaddr *ifmatmp; 3786 3787 CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link) 3788 MPASS(ifma != ifmatmp); 3789 } 3790 #endif 3791 if_freemulti(ifma); 3792 /* 3793 * The last reference to this instance of struct ifmultiaddr 3794 * was released; the hardware should be notified of this change. 3795 */ 3796 return 1; 3797 } 3798 3799 /* 3800 * Set the link layer address on an interface. 3801 * 3802 * At this time we only support certain types of interfaces, 3803 * and we don't allow the length of the address to change. 3804 * 3805 * Set noinline to be dtrace-friendly 3806 */ 3807 __noinline int 3808 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3809 { 3810 struct sockaddr_dl *sdl; 3811 struct ifaddr *ifa; 3812 struct ifreq ifr; 3813 3814 IF_ADDR_RLOCK(ifp); 3815 ifa = ifp->if_addr; 3816 if (ifa == NULL) { 3817 IF_ADDR_RUNLOCK(ifp); 3818 return (EINVAL); 3819 } 3820 ifa_ref(ifa); 3821 IF_ADDR_RUNLOCK(ifp); 3822 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3823 if (sdl == NULL) { 3824 ifa_free(ifa); 3825 return (EINVAL); 3826 } 3827 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3828 ifa_free(ifa); 3829 return (EINVAL); 3830 } 3831 switch (ifp->if_type) { 3832 case IFT_ETHER: 3833 case IFT_XETHER: 3834 case IFT_L2VLAN: 3835 case IFT_BRIDGE: 3836 case IFT_IEEE8023ADLAG: 3837 bcopy(lladdr, LLADDR(sdl), len); 3838 ifa_free(ifa); 3839 break; 3840 default: 3841 ifa_free(ifa); 3842 return (ENODEV); 3843 } 3844 3845 /* 3846 * If the interface is already up, we need 3847 * to re-init it in order to reprogram its 3848 * address filter. 3849 */ 3850 if ((ifp->if_flags & IFF_UP) != 0) { 3851 if (ifp->if_ioctl) { 3852 ifp->if_flags &= ~IFF_UP; 3853 ifr.ifr_flags = ifp->if_flags & 0xffff; 3854 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3855 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3856 ifp->if_flags |= IFF_UP; 3857 ifr.ifr_flags = ifp->if_flags & 0xffff; 3858 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3859 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3860 } 3861 } 3862 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 3863 return (0); 3864 } 3865 3866 /* 3867 * Compat function for handling basic encapsulation requests. 3868 * Not converted stacks (FDDI, IB, ..) supports traditional 3869 * output model: ARP (and other similar L2 protocols) are handled 3870 * inside output routine, arpresolve/nd6_resolve() returns MAC 3871 * address instead of full prepend. 3872 * 3873 * This function creates calculated header==MAC for IPv4/IPv6 and 3874 * returns EAFNOSUPPORT (which is then handled in ARP code) for other 3875 * address families. 3876 */ 3877 static int 3878 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req) 3879 { 3880 3881 if (req->rtype != IFENCAP_LL) 3882 return (EOPNOTSUPP); 3883 3884 if (req->bufsize < req->lladdr_len) 3885 return (ENOMEM); 3886 3887 switch (req->family) { 3888 case AF_INET: 3889 case AF_INET6: 3890 break; 3891 default: 3892 return (EAFNOSUPPORT); 3893 } 3894 3895 /* Copy lladdr to storage as is */ 3896 memmove(req->buf, req->lladdr, req->lladdr_len); 3897 req->bufsize = req->lladdr_len; 3898 req->lladdr_off = 0; 3899 3900 return (0); 3901 } 3902 3903 /* 3904 * Get the link layer address that was read from the hardware at attach. 3905 * 3906 * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type 3907 * their component interfaces as IFT_IEEE8023ADLAG. 3908 */ 3909 int 3910 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr) 3911 { 3912 3913 if (ifp->if_hw_addr == NULL) 3914 return (ENODEV); 3915 3916 switch (ifp->if_type) { 3917 case IFT_ETHER: 3918 case IFT_IEEE8023ADLAG: 3919 bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen); 3920 return (0); 3921 default: 3922 return (ENODEV); 3923 } 3924 } 3925 3926 /* 3927 * The name argument must be a pointer to storage which will last as 3928 * long as the interface does. For physical devices, the result of 3929 * device_get_name(dev) is a good choice and for pseudo-devices a 3930 * static string works well. 3931 */ 3932 void 3933 if_initname(struct ifnet *ifp, const char *name, int unit) 3934 { 3935 ifp->if_dname = name; 3936 ifp->if_dunit = unit; 3937 if (unit != IF_DUNIT_NONE) 3938 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3939 else 3940 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3941 } 3942 3943 int 3944 if_printf(struct ifnet *ifp, const char *fmt, ...) 3945 { 3946 char if_fmt[256]; 3947 va_list ap; 3948 3949 snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt); 3950 va_start(ap, fmt); 3951 vlog(LOG_INFO, if_fmt, ap); 3952 va_end(ap); 3953 return (0); 3954 } 3955 3956 void 3957 if_start(struct ifnet *ifp) 3958 { 3959 3960 (*(ifp)->if_start)(ifp); 3961 } 3962 3963 /* 3964 * Backwards compatibility interface for drivers 3965 * that have not implemented it 3966 */ 3967 static int 3968 if_transmit(struct ifnet *ifp, struct mbuf *m) 3969 { 3970 int error; 3971 3972 IFQ_HANDOFF(ifp, m, error); 3973 return (error); 3974 } 3975 3976 static void 3977 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 3978 { 3979 3980 m_freem(m); 3981 } 3982 3983 int 3984 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3985 { 3986 int active = 0; 3987 3988 IF_LOCK(ifq); 3989 if (_IF_QFULL(ifq)) { 3990 IF_UNLOCK(ifq); 3991 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 3992 m_freem(m); 3993 return (0); 3994 } 3995 if (ifp != NULL) { 3996 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 3997 if (m->m_flags & (M_BCAST|M_MCAST)) 3998 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 3999 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 4000 } 4001 _IF_ENQUEUE(ifq, m); 4002 IF_UNLOCK(ifq); 4003 if (ifp != NULL && !active) 4004 (*(ifp)->if_start)(ifp); 4005 return (1); 4006 } 4007 4008 void 4009 if_register_com_alloc(u_char type, 4010 if_com_alloc_t *a, if_com_free_t *f) 4011 { 4012 4013 KASSERT(if_com_alloc[type] == NULL, 4014 ("if_register_com_alloc: %d already registered", type)); 4015 KASSERT(if_com_free[type] == NULL, 4016 ("if_register_com_alloc: %d free already registered", type)); 4017 4018 if_com_alloc[type] = a; 4019 if_com_free[type] = f; 4020 } 4021 4022 void 4023 if_deregister_com_alloc(u_char type) 4024 { 4025 4026 KASSERT(if_com_alloc[type] != NULL, 4027 ("if_deregister_com_alloc: %d not registered", type)); 4028 KASSERT(if_com_free[type] != NULL, 4029 ("if_deregister_com_alloc: %d free not registered", type)); 4030 if_com_alloc[type] = NULL; 4031 if_com_free[type] = NULL; 4032 } 4033 4034 /* API for driver access to network stack owned ifnet.*/ 4035 uint64_t 4036 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 4037 { 4038 uint64_t oldbrate; 4039 4040 oldbrate = ifp->if_baudrate; 4041 ifp->if_baudrate = baudrate; 4042 return (oldbrate); 4043 } 4044 4045 uint64_t 4046 if_getbaudrate(if_t ifp) 4047 { 4048 4049 return (((struct ifnet *)ifp)->if_baudrate); 4050 } 4051 4052 int 4053 if_setcapabilities(if_t ifp, int capabilities) 4054 { 4055 ((struct ifnet *)ifp)->if_capabilities = capabilities; 4056 return (0); 4057 } 4058 4059 int 4060 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 4061 { 4062 ((struct ifnet *)ifp)->if_capabilities |= setbit; 4063 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 4064 4065 return (0); 4066 } 4067 4068 int 4069 if_getcapabilities(if_t ifp) 4070 { 4071 return ((struct ifnet *)ifp)->if_capabilities; 4072 } 4073 4074 int 4075 if_setcapenable(if_t ifp, int capabilities) 4076 { 4077 ((struct ifnet *)ifp)->if_capenable = capabilities; 4078 return (0); 4079 } 4080 4081 int 4082 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 4083 { 4084 if(setcap) 4085 ((struct ifnet *)ifp)->if_capenable |= setcap; 4086 if(clearcap) 4087 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 4088 4089 return (0); 4090 } 4091 4092 const char * 4093 if_getdname(if_t ifp) 4094 { 4095 return ((struct ifnet *)ifp)->if_dname; 4096 } 4097 4098 int 4099 if_togglecapenable(if_t ifp, int togglecap) 4100 { 4101 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 4102 return (0); 4103 } 4104 4105 int 4106 if_getcapenable(if_t ifp) 4107 { 4108 return ((struct ifnet *)ifp)->if_capenable; 4109 } 4110 4111 /* 4112 * This is largely undesirable because it ties ifnet to a device, but does 4113 * provide flexiblity for an embedded product vendor. Should be used with 4114 * the understanding that it violates the interface boundaries, and should be 4115 * a last resort only. 4116 */ 4117 int 4118 if_setdev(if_t ifp, void *dev) 4119 { 4120 return (0); 4121 } 4122 4123 int 4124 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 4125 { 4126 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 4127 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 4128 4129 return (0); 4130 } 4131 4132 int 4133 if_getdrvflags(if_t ifp) 4134 { 4135 return ((struct ifnet *)ifp)->if_drv_flags; 4136 } 4137 4138 int 4139 if_setdrvflags(if_t ifp, int flags) 4140 { 4141 ((struct ifnet *)ifp)->if_drv_flags = flags; 4142 return (0); 4143 } 4144 4145 4146 int 4147 if_setflags(if_t ifp, int flags) 4148 { 4149 ((struct ifnet *)ifp)->if_flags = flags; 4150 return (0); 4151 } 4152 4153 int 4154 if_setflagbits(if_t ifp, int set, int clear) 4155 { 4156 ((struct ifnet *)ifp)->if_flags |= set; 4157 ((struct ifnet *)ifp)->if_flags &= ~clear; 4158 4159 return (0); 4160 } 4161 4162 int 4163 if_getflags(if_t ifp) 4164 { 4165 return ((struct ifnet *)ifp)->if_flags; 4166 } 4167 4168 int 4169 if_clearhwassist(if_t ifp) 4170 { 4171 ((struct ifnet *)ifp)->if_hwassist = 0; 4172 return (0); 4173 } 4174 4175 int 4176 if_sethwassistbits(if_t ifp, int toset, int toclear) 4177 { 4178 ((struct ifnet *)ifp)->if_hwassist |= toset; 4179 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 4180 4181 return (0); 4182 } 4183 4184 int 4185 if_sethwassist(if_t ifp, int hwassist_bit) 4186 { 4187 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 4188 return (0); 4189 } 4190 4191 int 4192 if_gethwassist(if_t ifp) 4193 { 4194 return ((struct ifnet *)ifp)->if_hwassist; 4195 } 4196 4197 int 4198 if_setmtu(if_t ifp, int mtu) 4199 { 4200 ((struct ifnet *)ifp)->if_mtu = mtu; 4201 return (0); 4202 } 4203 4204 int 4205 if_getmtu(if_t ifp) 4206 { 4207 return ((struct ifnet *)ifp)->if_mtu; 4208 } 4209 4210 int 4211 if_getmtu_family(if_t ifp, int family) 4212 { 4213 struct domain *dp; 4214 4215 for (dp = domains; dp; dp = dp->dom_next) { 4216 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 4217 return (dp->dom_ifmtu((struct ifnet *)ifp)); 4218 } 4219 4220 return (((struct ifnet *)ifp)->if_mtu); 4221 } 4222 4223 int 4224 if_setsoftc(if_t ifp, void *softc) 4225 { 4226 ((struct ifnet *)ifp)->if_softc = softc; 4227 return (0); 4228 } 4229 4230 void * 4231 if_getsoftc(if_t ifp) 4232 { 4233 return ((struct ifnet *)ifp)->if_softc; 4234 } 4235 4236 void 4237 if_setrcvif(struct mbuf *m, if_t ifp) 4238 { 4239 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 4240 } 4241 4242 void 4243 if_setvtag(struct mbuf *m, uint16_t tag) 4244 { 4245 m->m_pkthdr.ether_vtag = tag; 4246 } 4247 4248 uint16_t 4249 if_getvtag(struct mbuf *m) 4250 { 4251 4252 return (m->m_pkthdr.ether_vtag); 4253 } 4254 4255 int 4256 if_sendq_empty(if_t ifp) 4257 { 4258 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 4259 } 4260 4261 struct ifaddr * 4262 if_getifaddr(if_t ifp) 4263 { 4264 return ((struct ifnet *)ifp)->if_addr; 4265 } 4266 4267 int 4268 if_getamcount(if_t ifp) 4269 { 4270 return ((struct ifnet *)ifp)->if_amcount; 4271 } 4272 4273 4274 int 4275 if_setsendqready(if_t ifp) 4276 { 4277 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 4278 return (0); 4279 } 4280 4281 int 4282 if_setsendqlen(if_t ifp, int tx_desc_count) 4283 { 4284 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 4285 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 4286 4287 return (0); 4288 } 4289 4290 int 4291 if_vlantrunkinuse(if_t ifp) 4292 { 4293 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 4294 } 4295 4296 int 4297 if_input(if_t ifp, struct mbuf* sendmp) 4298 { 4299 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 4300 return (0); 4301 4302 } 4303 4304 /* XXX */ 4305 #ifndef ETH_ADDR_LEN 4306 #define ETH_ADDR_LEN 6 4307 #endif 4308 4309 int 4310 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 4311 { 4312 struct ifmultiaddr *ifma; 4313 uint8_t *lmta = (uint8_t *)mta; 4314 int mcnt = 0; 4315 4316 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4317 if (ifma->ifma_addr->sa_family != AF_LINK) 4318 continue; 4319 4320 if (mcnt == max) 4321 break; 4322 4323 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 4324 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 4325 mcnt++; 4326 } 4327 *cnt = mcnt; 4328 4329 return (0); 4330 } 4331 4332 int 4333 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 4334 { 4335 int error; 4336 4337 if_maddr_rlock(ifp); 4338 error = if_setupmultiaddr(ifp, mta, cnt, max); 4339 if_maddr_runlock(ifp); 4340 return (error); 4341 } 4342 4343 int 4344 if_multiaddr_count(if_t ifp, int max) 4345 { 4346 struct ifmultiaddr *ifma; 4347 int count; 4348 4349 count = 0; 4350 if_maddr_rlock(ifp); 4351 CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 4352 if (ifma->ifma_addr->sa_family != AF_LINK) 4353 continue; 4354 count++; 4355 if (count == max) 4356 break; 4357 } 4358 if_maddr_runlock(ifp); 4359 return (count); 4360 } 4361 4362 int 4363 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg) 4364 { 4365 struct ifmultiaddr *ifma; 4366 int cnt = 0; 4367 4368 if_maddr_rlock(ifp); 4369 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 4370 cnt += filter(arg, ifma, cnt); 4371 if_maddr_runlock(ifp); 4372 return (cnt); 4373 } 4374 4375 struct mbuf * 4376 if_dequeue(if_t ifp) 4377 { 4378 struct mbuf *m; 4379 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 4380 4381 return (m); 4382 } 4383 4384 int 4385 if_sendq_prepend(if_t ifp, struct mbuf *m) 4386 { 4387 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 4388 return (0); 4389 } 4390 4391 int 4392 if_setifheaderlen(if_t ifp, int len) 4393 { 4394 ((struct ifnet *)ifp)->if_hdrlen = len; 4395 return (0); 4396 } 4397 4398 caddr_t 4399 if_getlladdr(if_t ifp) 4400 { 4401 return (IF_LLADDR((struct ifnet *)ifp)); 4402 } 4403 4404 void * 4405 if_gethandle(u_char type) 4406 { 4407 return (if_alloc(type)); 4408 } 4409 4410 void 4411 if_bpfmtap(if_t ifh, struct mbuf *m) 4412 { 4413 struct ifnet *ifp = (struct ifnet *)ifh; 4414 4415 BPF_MTAP(ifp, m); 4416 } 4417 4418 void 4419 if_etherbpfmtap(if_t ifh, struct mbuf *m) 4420 { 4421 struct ifnet *ifp = (struct ifnet *)ifh; 4422 4423 ETHER_BPF_MTAP(ifp, m); 4424 } 4425 4426 void 4427 if_vlancap(if_t ifh) 4428 { 4429 struct ifnet *ifp = (struct ifnet *)ifh; 4430 VLAN_CAPABILITIES(ifp); 4431 } 4432 4433 int 4434 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax) 4435 { 4436 4437 ((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax; 4438 return (0); 4439 } 4440 4441 int 4442 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount) 4443 { 4444 4445 ((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount; 4446 return (0); 4447 } 4448 4449 int 4450 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize) 4451 { 4452 4453 ((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize; 4454 return (0); 4455 } 4456 4457 u_int 4458 if_gethwtsomax(if_t ifp) 4459 { 4460 4461 return (((struct ifnet *)ifp)->if_hw_tsomax); 4462 } 4463 4464 u_int 4465 if_gethwtsomaxsegcount(if_t ifp) 4466 { 4467 4468 return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount); 4469 } 4470 4471 u_int 4472 if_gethwtsomaxsegsize(if_t ifp) 4473 { 4474 4475 return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize); 4476 } 4477 4478 void 4479 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 4480 { 4481 ((struct ifnet *)ifp)->if_init = init_fn; 4482 } 4483 4484 void 4485 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 4486 { 4487 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 4488 } 4489 4490 void 4491 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 4492 { 4493 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 4494 } 4495 4496 void 4497 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 4498 { 4499 ((struct ifnet *)ifp)->if_transmit = start_fn; 4500 } 4501 4502 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 4503 { 4504 ((struct ifnet *)ifp)->if_qflush = flush_fn; 4505 4506 } 4507 4508 void 4509 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 4510 { 4511 4512 ifp->if_get_counter = fn; 4513 } 4514 4515 /* Revisit these - These are inline functions originally. */ 4516 int 4517 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4518 { 4519 return drbr_inuse(ifh, br); 4520 } 4521 4522 struct mbuf* 4523 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4524 { 4525 return drbr_dequeue(ifh, br); 4526 } 4527 4528 int 4529 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4530 { 4531 return drbr_needs_enqueue(ifh, br); 4532 } 4533 4534 int 4535 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4536 { 4537 return drbr_enqueue(ifh, br, m); 4538 4539 } 4540