FreeBSD/Linux Kernel Cross Reference
sys/net/if.c
1 /*-
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)if.c 8.5 (Berkeley) 1/9/95
30 * $FreeBSD: releng/10.0/sys/net/if.c 255442 2013-09-10 10:05:59Z des $
31 */
32
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
35 #include "opt_inet.h"
36
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <sys/conf.h>
40 #include <sys/malloc.h>
41 #include <sys/sbuf.h>
42 #include <sys/bus.h>
43 #include <sys/mbuf.h>
44 #include <sys/systm.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 #include <sys/kernel.h>
51 #include <sys/lock.h>
52 #include <sys/refcount.h>
53 #include <sys/module.h>
54 #include <sys/rwlock.h>
55 #include <sys/sockio.h>
56 #include <sys/syslog.h>
57 #include <sys/sysctl.h>
58 #include <sys/taskqueue.h>
59 #include <sys/domain.h>
60 #include <sys/jail.h>
61 #include <sys/priv.h>
62
63 #include <machine/stdarg.h>
64 #include <vm/uma.h>
65
66 #include <net/if.h>
67 #include <net/if_arp.h>
68 #include <net/if_clone.h>
69 #include <net/if_dl.h>
70 #include <net/if_types.h>
71 #include <net/if_var.h>
72 #include <net/radix.h>
73 #include <net/route.h>
74 #include <net/vnet.h>
75
76 #if defined(INET) || defined(INET6)
77 #include <netinet/in.h>
78 #include <netinet/in_var.h>
79 #include <netinet/ip.h>
80 #include <netinet/ip_carp.h>
81 #ifdef INET
82 #include <netinet/if_ether.h>
83 #endif /* INET */
84 #ifdef INET6
85 #include <netinet6/in6_var.h>
86 #include <netinet6/in6_ifattach.h>
87 #endif /* INET6 */
88 #endif /* INET || INET6 */
89
90 #include <security/mac/mac_framework.h>
91
92 #ifdef COMPAT_FREEBSD32
93 #include <sys/mount.h>
94 #include <compat/freebsd32/freebsd32.h>
95 #endif
96
97 struct ifindex_entry {
98 struct ifnet *ife_ifnet;
99 };
100
101 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
102 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
103
104 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen);
105 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
106 &ifqmaxlen, 0, "max send queue size");
107
108 /* Log link state change events */
109 static int log_link_state_change = 1;
110
111 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
112 &log_link_state_change, 0,
113 "log interface link state change events");
114
115 /* Interface description */
116 static unsigned int ifdescr_maxlen = 1024;
117 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW,
118 &ifdescr_maxlen, 0,
119 "administrative maximum length for interface description");
120
121 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions");
122
123 /* global sx for non-critical path ifdescr */
124 static struct sx ifdescr_sx;
125 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
126
127 void (*bridge_linkstate_p)(struct ifnet *ifp);
128 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
129 void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
130 /* These are external hooks for CARP. */
131 void (*carp_linkstate_p)(struct ifnet *ifp);
132 void (*carp_demote_adj_p)(int, char *);
133 int (*carp_master_p)(struct ifaddr *);
134 #if defined(INET) || defined(INET6)
135 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
136 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
137 const struct sockaddr *sa);
138 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
139 int (*carp_attach_p)(struct ifaddr *, int);
140 void (*carp_detach_p)(struct ifaddr *);
141 #endif
142 #ifdef INET
143 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **);
144 #endif
145 #ifdef INET6
146 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
147 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
148 const struct in6_addr *taddr);
149 #endif
150
151 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
152
153 /*
154 * XXX: Style; these should be sorted alphabetically, and unprototyped
155 * static functions should be prototyped. Currently they are sorted by
156 * declaration order.
157 */
158 static void if_attachdomain(void *);
159 static void if_attachdomain1(struct ifnet *);
160 static int ifconf(u_long, caddr_t);
161 static void if_freemulti(struct ifmultiaddr *);
162 static void if_init(void *);
163 static void if_grow(void);
164 static void if_route(struct ifnet *, int flag, int fam);
165 static int if_setflag(struct ifnet *, int, int, int *, int);
166 static int if_transmit(struct ifnet *ifp, struct mbuf *m);
167 static void if_unroute(struct ifnet *, int flag, int fam);
168 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
169 static int if_rtdel(struct radix_node *, void *);
170 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
171 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
172 static void do_link_state_change(void *, int);
173 static int if_getgroup(struct ifgroupreq *, struct ifnet *);
174 static int if_getgroupmembers(struct ifgroupreq *);
175 static void if_delgroups(struct ifnet *);
176 static void if_attach_internal(struct ifnet *, int);
177 static void if_detach_internal(struct ifnet *, int);
178
179 #ifdef INET6
180 /*
181 * XXX: declare here to avoid to include many inet6 related files..
182 * should be more generalized?
183 */
184 extern void nd6_setmtu(struct ifnet *);
185 #endif
186
187 VNET_DEFINE(int, if_index);
188 int ifqmaxlen = IFQ_MAXLEN;
189 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */
190 VNET_DEFINE(struct ifgrouphead, ifg_head);
191
192 static VNET_DEFINE(int, if_indexlim) = 8;
193
194 /* Table of ifnet by index. */
195 VNET_DEFINE(struct ifindex_entry *, ifindex_table);
196
197 #define V_if_indexlim VNET(if_indexlim)
198 #define V_ifindex_table VNET(ifindex_table)
199
200 /*
201 * The global network interface list (V_ifnet) and related state (such as
202 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and
203 * an rwlock. Either may be acquired shared to stablize the list, but both
204 * must be acquired writable to modify the list. This model allows us to
205 * both stablize the interface list during interrupt thread processing, but
206 * also to stablize it over long-running ioctls, without introducing priority
207 * inversions and deadlocks.
208 */
209 struct rwlock ifnet_rwlock;
210 struct sx ifnet_sxlock;
211
212 /*
213 * The allocation of network interfaces is a rather non-atomic affair; we
214 * need to select an index before we are ready to expose the interface for
215 * use, so will use this pointer value to indicate reservation.
216 */
217 #define IFNET_HOLD (void *)(uintptr_t)(-1)
218
219 static if_com_alloc_t *if_com_alloc[256];
220 static if_com_free_t *if_com_free[256];
221
222 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
223 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
224 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
225
226 struct ifnet *
227 ifnet_byindex_locked(u_short idx)
228 {
229
230 if (idx > V_if_index)
231 return (NULL);
232 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD)
233 return (NULL);
234 return (V_ifindex_table[idx].ife_ifnet);
235 }
236
237 struct ifnet *
238 ifnet_byindex(u_short idx)
239 {
240 struct ifnet *ifp;
241
242 IFNET_RLOCK_NOSLEEP();
243 ifp = ifnet_byindex_locked(idx);
244 IFNET_RUNLOCK_NOSLEEP();
245 return (ifp);
246 }
247
248 struct ifnet *
249 ifnet_byindex_ref(u_short idx)
250 {
251 struct ifnet *ifp;
252
253 IFNET_RLOCK_NOSLEEP();
254 ifp = ifnet_byindex_locked(idx);
255 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) {
256 IFNET_RUNLOCK_NOSLEEP();
257 return (NULL);
258 }
259 if_ref(ifp);
260 IFNET_RUNLOCK_NOSLEEP();
261 return (ifp);
262 }
263
264 /*
265 * Allocate an ifindex array entry; return 0 on success or an error on
266 * failure.
267 */
268 static int
269 ifindex_alloc_locked(u_short *idxp)
270 {
271 u_short idx;
272
273 IFNET_WLOCK_ASSERT();
274
275 retry:
276 /*
277 * Try to find an empty slot below V_if_index. If we fail, take the
278 * next slot.
279 */
280 for (idx = 1; idx <= V_if_index; idx++) {
281 if (V_ifindex_table[idx].ife_ifnet == NULL)
282 break;
283 }
284
285 /* Catch if_index overflow. */
286 if (idx < 1)
287 return (ENOSPC);
288 if (idx >= V_if_indexlim) {
289 if_grow();
290 goto retry;
291 }
292 if (idx > V_if_index)
293 V_if_index = idx;
294 *idxp = idx;
295 return (0);
296 }
297
298 static void
299 ifindex_free_locked(u_short idx)
300 {
301
302 IFNET_WLOCK_ASSERT();
303
304 V_ifindex_table[idx].ife_ifnet = NULL;
305 while (V_if_index > 0 &&
306 V_ifindex_table[V_if_index].ife_ifnet == NULL)
307 V_if_index--;
308 }
309
310 static void
311 ifindex_free(u_short idx)
312 {
313
314 IFNET_WLOCK();
315 ifindex_free_locked(idx);
316 IFNET_WUNLOCK();
317 }
318
319 static void
320 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp)
321 {
322
323 IFNET_WLOCK_ASSERT();
324
325 V_ifindex_table[idx].ife_ifnet = ifp;
326 }
327
328 static void
329 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
330 {
331
332 IFNET_WLOCK();
333 ifnet_setbyindex_locked(idx, ifp);
334 IFNET_WUNLOCK();
335 }
336
337 struct ifaddr *
338 ifaddr_byindex(u_short idx)
339 {
340 struct ifaddr *ifa;
341
342 IFNET_RLOCK_NOSLEEP();
343 ifa = ifnet_byindex_locked(idx)->if_addr;
344 if (ifa != NULL)
345 ifa_ref(ifa);
346 IFNET_RUNLOCK_NOSLEEP();
347 return (ifa);
348 }
349
350 /*
351 * Network interface utility routines.
352 *
353 * Routines with ifa_ifwith* names take sockaddr *'s as
354 * parameters.
355 */
356
357 static void
358 vnet_if_init(const void *unused __unused)
359 {
360
361 TAILQ_INIT(&V_ifnet);
362 TAILQ_INIT(&V_ifg_head);
363 IFNET_WLOCK();
364 if_grow(); /* create initial table */
365 IFNET_WUNLOCK();
366 vnet_if_clone_init();
367 }
368 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
369 NULL);
370
371 /* ARGSUSED*/
372 static void
373 if_init(void *dummy __unused)
374 {
375
376 IFNET_LOCK_INIT();
377 if_clone_init();
378 }
379 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL);
380
381
382 #ifdef VIMAGE
383 static void
384 vnet_if_uninit(const void *unused __unused)
385 {
386
387 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
388 "not empty", __func__, __LINE__, &V_ifnet));
389 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
390 "not empty", __func__, __LINE__, &V_ifg_head));
391
392 free((caddr_t)V_ifindex_table, M_IFNET);
393 }
394 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
395 vnet_if_uninit, NULL);
396 #endif
397
398 static void
399 if_grow(void)
400 {
401 int oldlim;
402 u_int n;
403 struct ifindex_entry *e;
404
405 IFNET_WLOCK_ASSERT();
406 oldlim = V_if_indexlim;
407 IFNET_WUNLOCK();
408 n = (oldlim << 1) * sizeof(*e);
409 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
410 IFNET_WLOCK();
411 if (V_if_indexlim != oldlim) {
412 free(e, M_IFNET);
413 return;
414 }
415 if (V_ifindex_table != NULL) {
416 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2);
417 free((caddr_t)V_ifindex_table, M_IFNET);
418 }
419 V_if_indexlim <<= 1;
420 V_ifindex_table = e;
421 }
422
423 /*
424 * Allocate a struct ifnet and an index for an interface. A layer 2
425 * common structure will also be allocated if an allocation routine is
426 * registered for the passed type.
427 */
428 struct ifnet *
429 if_alloc(u_char type)
430 {
431 struct ifnet *ifp;
432 u_short idx;
433
434 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
435 IFNET_WLOCK();
436 if (ifindex_alloc_locked(&idx) != 0) {
437 IFNET_WUNLOCK();
438 free(ifp, M_IFNET);
439 return (NULL);
440 }
441 ifnet_setbyindex_locked(idx, IFNET_HOLD);
442 IFNET_WUNLOCK();
443 ifp->if_index = idx;
444 ifp->if_type = type;
445 ifp->if_alloctype = type;
446 if (if_com_alloc[type] != NULL) {
447 ifp->if_l2com = if_com_alloc[type](type, ifp);
448 if (ifp->if_l2com == NULL) {
449 free(ifp, M_IFNET);
450 ifindex_free(idx);
451 return (NULL);
452 }
453 }
454
455 IF_ADDR_LOCK_INIT(ifp);
456 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
457 ifp->if_afdata_initialized = 0;
458 IF_AFDATA_LOCK_INIT(ifp);
459 TAILQ_INIT(&ifp->if_addrhead);
460 TAILQ_INIT(&ifp->if_multiaddrs);
461 TAILQ_INIT(&ifp->if_groups);
462 #ifdef MAC
463 mac_ifnet_init(ifp);
464 #endif
465 ifq_init(&ifp->if_snd, ifp);
466
467 refcount_init(&ifp->if_refcount, 1); /* Index reference. */
468 ifnet_setbyindex(ifp->if_index, ifp);
469 return (ifp);
470 }
471
472 /*
473 * Do the actual work of freeing a struct ifnet, and layer 2 common
474 * structure. This call is made when the last reference to an
475 * interface is released.
476 */
477 static void
478 if_free_internal(struct ifnet *ifp)
479 {
480
481 KASSERT((ifp->if_flags & IFF_DYING),
482 ("if_free_internal: interface not dying"));
483
484 if (if_com_free[ifp->if_alloctype] != NULL)
485 if_com_free[ifp->if_alloctype](ifp->if_l2com,
486 ifp->if_alloctype);
487
488 #ifdef MAC
489 mac_ifnet_destroy(ifp);
490 #endif /* MAC */
491 if (ifp->if_description != NULL)
492 free(ifp->if_description, M_IFDESCR);
493 IF_AFDATA_DESTROY(ifp);
494 IF_ADDR_LOCK_DESTROY(ifp);
495 ifq_delete(&ifp->if_snd);
496 free(ifp, M_IFNET);
497 }
498
499 /*
500 * Deregister an interface and free the associated storage.
501 */
502 void
503 if_free(struct ifnet *ifp)
504 {
505
506 ifp->if_flags |= IFF_DYING; /* XXX: Locking */
507
508 CURVNET_SET_QUIET(ifp->if_vnet);
509 IFNET_WLOCK();
510 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index),
511 ("%s: freeing unallocated ifnet", ifp->if_xname));
512
513 ifindex_free_locked(ifp->if_index);
514 IFNET_WUNLOCK();
515
516 if (refcount_release(&ifp->if_refcount))
517 if_free_internal(ifp);
518 CURVNET_RESTORE();
519 }
520
521 /*
522 * Interfaces to keep an ifnet type-stable despite the possibility of the
523 * driver calling if_free(). If there are additional references, we defer
524 * freeing the underlying data structure.
525 */
526 void
527 if_ref(struct ifnet *ifp)
528 {
529
530 /* We don't assert the ifnet list lock here, but arguably should. */
531 refcount_acquire(&ifp->if_refcount);
532 }
533
534 void
535 if_rele(struct ifnet *ifp)
536 {
537
538 if (!refcount_release(&ifp->if_refcount))
539 return;
540 if_free_internal(ifp);
541 }
542
543 void
544 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
545 {
546
547 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
548
549 if (ifq->ifq_maxlen == 0)
550 ifq->ifq_maxlen = ifqmaxlen;
551
552 ifq->altq_type = 0;
553 ifq->altq_disc = NULL;
554 ifq->altq_flags &= ALTQF_CANTCHANGE;
555 ifq->altq_tbr = NULL;
556 ifq->altq_ifp = ifp;
557 }
558
559 void
560 ifq_delete(struct ifaltq *ifq)
561 {
562 mtx_destroy(&ifq->ifq_mtx);
563 }
564
565 /*
566 * Perform generic interface initalization tasks and attach the interface
567 * to the list of "active" interfaces. If vmove flag is set on entry
568 * to if_attach_internal(), perform only a limited subset of initialization
569 * tasks, given that we are moving from one vnet to another an ifnet which
570 * has already been fully initialized.
571 *
572 * XXX:
573 * - The decision to return void and thus require this function to
574 * succeed is questionable.
575 * - We should probably do more sanity checking. For instance we don't
576 * do anything to insure if_xname is unique or non-empty.
577 */
578 void
579 if_attach(struct ifnet *ifp)
580 {
581
582 if_attach_internal(ifp, 0);
583 }
584
585 static void
586 if_attach_internal(struct ifnet *ifp, int vmove)
587 {
588 unsigned socksize, ifasize;
589 int namelen, masklen;
590 struct sockaddr_dl *sdl;
591 struct ifaddr *ifa;
592
593 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
594 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
595 ifp->if_xname);
596
597 #ifdef VIMAGE
598 ifp->if_vnet = curvnet;
599 if (ifp->if_home_vnet == NULL)
600 ifp->if_home_vnet = curvnet;
601 #endif
602
603 if_addgroup(ifp, IFG_ALL);
604
605 getmicrotime(&ifp->if_lastchange);
606 ifp->if_data.ifi_epoch = time_uptime;
607 ifp->if_data.ifi_datalen = sizeof(struct if_data);
608
609 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
610 (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
611 ("transmit and qflush must both either be set or both be NULL"));
612 if (ifp->if_transmit == NULL) {
613 ifp->if_transmit = if_transmit;
614 ifp->if_qflush = if_qflush;
615 }
616
617 if (!vmove) {
618 #ifdef MAC
619 mac_ifnet_create(ifp);
620 #endif
621
622 /*
623 * Create a Link Level name for this device.
624 */
625 namelen = strlen(ifp->if_xname);
626 /*
627 * Always save enough space for any possiable name so we
628 * can do a rename in place later.
629 */
630 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
631 socksize = masklen + ifp->if_addrlen;
632 if (socksize < sizeof(*sdl))
633 socksize = sizeof(*sdl);
634 socksize = roundup2(socksize, sizeof(long));
635 ifasize = sizeof(*ifa) + 2 * socksize;
636 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
637 ifa_init(ifa);
638 sdl = (struct sockaddr_dl *)(ifa + 1);
639 sdl->sdl_len = socksize;
640 sdl->sdl_family = AF_LINK;
641 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
642 sdl->sdl_nlen = namelen;
643 sdl->sdl_index = ifp->if_index;
644 sdl->sdl_type = ifp->if_type;
645 ifp->if_addr = ifa;
646 ifa->ifa_ifp = ifp;
647 ifa->ifa_rtrequest = link_rtrequest;
648 ifa->ifa_addr = (struct sockaddr *)sdl;
649 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
650 ifa->ifa_netmask = (struct sockaddr *)sdl;
651 sdl->sdl_len = masklen;
652 while (namelen != 0)
653 sdl->sdl_data[--namelen] = 0xff;
654 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
655 /* Reliably crash if used uninitialized. */
656 ifp->if_broadcastaddr = NULL;
657
658 #if defined(INET) || defined(INET6)
659 /* Initialize to max value. */
660 if (ifp->if_hw_tsomax == 0)
661 ifp->if_hw_tsomax = IP_MAXPACKET;
662 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET &&
663 ifp->if_hw_tsomax >= IP_MAXPACKET / 8,
664 ("%s: tsomax outside of range", __func__));
665 #endif
666 }
667 #ifdef VIMAGE
668 else {
669 /*
670 * Update the interface index in the link layer address
671 * of the interface.
672 */
673 for (ifa = ifp->if_addr; ifa != NULL;
674 ifa = TAILQ_NEXT(ifa, ifa_link)) {
675 if (ifa->ifa_addr->sa_family == AF_LINK) {
676 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
677 sdl->sdl_index = ifp->if_index;
678 }
679 }
680 }
681 #endif
682
683 IFNET_WLOCK();
684 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
685 #ifdef VIMAGE
686 curvnet->vnet_ifcnt++;
687 #endif
688 IFNET_WUNLOCK();
689
690 if (domain_init_status >= 2)
691 if_attachdomain1(ifp);
692
693 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
694 if (IS_DEFAULT_VNET(curvnet))
695 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
696
697 /* Announce the interface. */
698 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
699 }
700
701 static void
702 if_attachdomain(void *dummy)
703 {
704 struct ifnet *ifp;
705
706 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
707 if_attachdomain1(ifp);
708 }
709 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
710 if_attachdomain, NULL);
711
712 static void
713 if_attachdomain1(struct ifnet *ifp)
714 {
715 struct domain *dp;
716
717 /*
718 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
719 * cannot lock ifp->if_afdata initialization, entirely.
720 */
721 if (IF_AFDATA_TRYLOCK(ifp) == 0)
722 return;
723 if (ifp->if_afdata_initialized >= domain_init_status) {
724 IF_AFDATA_UNLOCK(ifp);
725 log(LOG_WARNING, "%s called more than once on %s\n",
726 __func__, ifp->if_xname);
727 return;
728 }
729 ifp->if_afdata_initialized = domain_init_status;
730 IF_AFDATA_UNLOCK(ifp);
731
732 /* address family dependent data region */
733 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
734 for (dp = domains; dp; dp = dp->dom_next) {
735 if (dp->dom_ifattach)
736 ifp->if_afdata[dp->dom_family] =
737 (*dp->dom_ifattach)(ifp);
738 }
739 }
740
741 /*
742 * Remove any unicast or broadcast network addresses from an interface.
743 */
744 void
745 if_purgeaddrs(struct ifnet *ifp)
746 {
747 struct ifaddr *ifa, *next;
748
749 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
750 if (ifa->ifa_addr->sa_family == AF_LINK)
751 continue;
752 #ifdef INET
753 /* XXX: Ugly!! ad hoc just for INET */
754 if (ifa->ifa_addr->sa_family == AF_INET) {
755 struct ifaliasreq ifr;
756
757 bzero(&ifr, sizeof(ifr));
758 ifr.ifra_addr = *ifa->ifa_addr;
759 if (ifa->ifa_dstaddr)
760 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
761 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
762 NULL) == 0)
763 continue;
764 }
765 #endif /* INET */
766 #ifdef INET6
767 if (ifa->ifa_addr->sa_family == AF_INET6) {
768 in6_purgeaddr(ifa);
769 /* ifp_addrhead is already updated */
770 continue;
771 }
772 #endif /* INET6 */
773 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
774 ifa_free(ifa);
775 }
776 }
777
778 /*
779 * Remove any multicast network addresses from an interface when an ifnet
780 * is going away.
781 */
782 static void
783 if_purgemaddrs(struct ifnet *ifp)
784 {
785 struct ifmultiaddr *ifma;
786 struct ifmultiaddr *next;
787
788 IF_ADDR_WLOCK(ifp);
789 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
790 if_delmulti_locked(ifp, ifma, 1);
791 IF_ADDR_WUNLOCK(ifp);
792 }
793
794 /*
795 * Detach an interface, removing it from the list of "active" interfaces.
796 * If vmove flag is set on entry to if_detach_internal(), perform only a
797 * limited subset of cleanup tasks, given that we are moving an ifnet from
798 * one vnet to another, where it must be fully operational.
799 *
800 * XXXRW: There are some significant questions about event ordering, and
801 * how to prevent things from starting to use the interface during detach.
802 */
803 void
804 if_detach(struct ifnet *ifp)
805 {
806
807 CURVNET_SET_QUIET(ifp->if_vnet);
808 if_detach_internal(ifp, 0);
809 CURVNET_RESTORE();
810 }
811
812 static void
813 if_detach_internal(struct ifnet *ifp, int vmove)
814 {
815 struct ifaddr *ifa;
816 struct radix_node_head *rnh;
817 int i, j;
818 struct domain *dp;
819 struct ifnet *iter;
820 int found = 0;
821
822 IFNET_WLOCK();
823 TAILQ_FOREACH(iter, &V_ifnet, if_link)
824 if (iter == ifp) {
825 TAILQ_REMOVE(&V_ifnet, ifp, if_link);
826 found = 1;
827 break;
828 }
829 #ifdef VIMAGE
830 if (found)
831 curvnet->vnet_ifcnt--;
832 #endif
833 IFNET_WUNLOCK();
834 if (!found) {
835 if (vmove)
836 panic("%s: ifp=%p not on the ifnet tailq %p",
837 __func__, ifp, &V_ifnet);
838 else
839 return; /* XXX this should panic as well? */
840 }
841
842 /*
843 * Remove/wait for pending events.
844 */
845 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
846
847 /*
848 * Remove routes and flush queues.
849 */
850 if_down(ifp);
851 #ifdef ALTQ
852 if (ALTQ_IS_ENABLED(&ifp->if_snd))
853 altq_disable(&ifp->if_snd);
854 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
855 altq_detach(&ifp->if_snd);
856 #endif
857
858 if_purgeaddrs(ifp);
859
860 #ifdef INET
861 in_ifdetach(ifp);
862 #endif
863
864 #ifdef INET6
865 /*
866 * Remove all IPv6 kernel structs related to ifp. This should be done
867 * before removing routing entries below, since IPv6 interface direct
868 * routes are expected to be removed by the IPv6-specific kernel API.
869 * Otherwise, the kernel will detect some inconsistency and bark it.
870 */
871 in6_ifdetach(ifp);
872 #endif
873 if_purgemaddrs(ifp);
874
875 if (!vmove) {
876 /*
877 * Prevent further calls into the device driver via ifnet.
878 */
879 if_dead(ifp);
880
881 /*
882 * Remove link ifaddr pointer and maybe decrement if_index.
883 * Clean up all addresses.
884 */
885 ifp->if_addr = NULL;
886
887 /* We can now free link ifaddr. */
888 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
889 ifa = TAILQ_FIRST(&ifp->if_addrhead);
890 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
891 ifa_free(ifa);
892 }
893 }
894
895 /*
896 * Delete all remaining routes using this interface
897 * Unfortuneatly the only way to do this is to slog through
898 * the entire routing table looking for routes which point
899 * to this interface...oh well...
900 */
901 for (i = 1; i <= AF_MAX; i++) {
902 for (j = 0; j < rt_numfibs; j++) {
903 rnh = rt_tables_get_rnh(j, i);
904 if (rnh == NULL)
905 continue;
906 RADIX_NODE_HEAD_LOCK(rnh);
907 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
908 RADIX_NODE_HEAD_UNLOCK(rnh);
909 }
910 }
911
912 /* Announce that the interface is gone. */
913 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
914 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
915 if (IS_DEFAULT_VNET(curvnet))
916 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
917 if_delgroups(ifp);
918
919 /*
920 * We cannot hold the lock over dom_ifdetach calls as they might
921 * sleep, for example trying to drain a callout, thus open up the
922 * theoretical race with re-attaching.
923 */
924 IF_AFDATA_LOCK(ifp);
925 i = ifp->if_afdata_initialized;
926 ifp->if_afdata_initialized = 0;
927 IF_AFDATA_UNLOCK(ifp);
928 for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
929 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
930 (*dp->dom_ifdetach)(ifp,
931 ifp->if_afdata[dp->dom_family]);
932 }
933 }
934
935 #ifdef VIMAGE
936 /*
937 * if_vmove() performs a limited version of if_detach() in current
938 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
939 * An attempt is made to shrink if_index in current vnet, find an
940 * unused if_index in target vnet and calls if_grow() if necessary,
941 * and finally find an unused if_xname for the target vnet.
942 */
943 void
944 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
945 {
946 u_short idx;
947
948 /*
949 * Detach from current vnet, but preserve LLADDR info, do not
950 * mark as dead etc. so that the ifnet can be reattached later.
951 */
952 if_detach_internal(ifp, 1);
953
954 /*
955 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
956 * the if_index for that vnet if possible.
957 *
958 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
959 * or we'd lock on one vnet and unlock on another.
960 */
961 IFNET_WLOCK();
962 ifindex_free_locked(ifp->if_index);
963 IFNET_WUNLOCK();
964
965 /*
966 * Perform interface-specific reassignment tasks, if provided by
967 * the driver.
968 */
969 if (ifp->if_reassign != NULL)
970 ifp->if_reassign(ifp, new_vnet, NULL);
971
972 /*
973 * Switch to the context of the target vnet.
974 */
975 CURVNET_SET_QUIET(new_vnet);
976
977 IFNET_WLOCK();
978 if (ifindex_alloc_locked(&idx) != 0) {
979 IFNET_WUNLOCK();
980 panic("if_index overflow");
981 }
982 ifp->if_index = idx;
983 ifnet_setbyindex_locked(ifp->if_index, ifp);
984 IFNET_WUNLOCK();
985
986 if_attach_internal(ifp, 1);
987
988 CURVNET_RESTORE();
989 }
990
991 /*
992 * Move an ifnet to or from another child prison/vnet, specified by the jail id.
993 */
994 static int
995 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
996 {
997 struct prison *pr;
998 struct ifnet *difp;
999
1000 /* Try to find the prison within our visibility. */
1001 sx_slock(&allprison_lock);
1002 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1003 sx_sunlock(&allprison_lock);
1004 if (pr == NULL)
1005 return (ENXIO);
1006 prison_hold_locked(pr);
1007 mtx_unlock(&pr->pr_mtx);
1008
1009 /* Do not try to move the iface from and to the same prison. */
1010 if (pr->pr_vnet == ifp->if_vnet) {
1011 prison_free(pr);
1012 return (EEXIST);
1013 }
1014
1015 /* Make sure the named iface does not exists in the dst. prison/vnet. */
1016 /* XXX Lock interfaces to avoid races. */
1017 CURVNET_SET_QUIET(pr->pr_vnet);
1018 difp = ifunit(ifname);
1019 CURVNET_RESTORE();
1020 if (difp != NULL) {
1021 prison_free(pr);
1022 return (EEXIST);
1023 }
1024
1025 /* Move the interface into the child jail/vnet. */
1026 if_vmove(ifp, pr->pr_vnet);
1027
1028 /* Report the new if_xname back to the userland. */
1029 sprintf(ifname, "%s", ifp->if_xname);
1030
1031 prison_free(pr);
1032 return (0);
1033 }
1034
1035 static int
1036 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1037 {
1038 struct prison *pr;
1039 struct vnet *vnet_dst;
1040 struct ifnet *ifp;
1041
1042 /* Try to find the prison within our visibility. */
1043 sx_slock(&allprison_lock);
1044 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1045 sx_sunlock(&allprison_lock);
1046 if (pr == NULL)
1047 return (ENXIO);
1048 prison_hold_locked(pr);
1049 mtx_unlock(&pr->pr_mtx);
1050
1051 /* Make sure the named iface exists in the source prison/vnet. */
1052 CURVNET_SET(pr->pr_vnet);
1053 ifp = ifunit(ifname); /* XXX Lock to avoid races. */
1054 if (ifp == NULL) {
1055 CURVNET_RESTORE();
1056 prison_free(pr);
1057 return (ENXIO);
1058 }
1059
1060 /* Do not try to move the iface from and to the same prison. */
1061 vnet_dst = TD_TO_VNET(td);
1062 if (vnet_dst == ifp->if_vnet) {
1063 CURVNET_RESTORE();
1064 prison_free(pr);
1065 return (EEXIST);
1066 }
1067
1068 /* Get interface back from child jail/vnet. */
1069 if_vmove(ifp, vnet_dst);
1070 CURVNET_RESTORE();
1071
1072 /* Report the new if_xname back to the userland. */
1073 sprintf(ifname, "%s", ifp->if_xname);
1074
1075 prison_free(pr);
1076 return (0);
1077 }
1078 #endif /* VIMAGE */
1079
1080 /*
1081 * Add a group to an interface
1082 */
1083 int
1084 if_addgroup(struct ifnet *ifp, const char *groupname)
1085 {
1086 struct ifg_list *ifgl;
1087 struct ifg_group *ifg = NULL;
1088 struct ifg_member *ifgm;
1089 int new = 0;
1090
1091 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' &&
1092 groupname[strlen(groupname) - 1] <= '9')
1093 return (EINVAL);
1094
1095 IFNET_WLOCK();
1096 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1097 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1098 IFNET_WUNLOCK();
1099 return (EEXIST);
1100 }
1101
1102 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
1103 M_NOWAIT)) == NULL) {
1104 IFNET_WUNLOCK();
1105 return (ENOMEM);
1106 }
1107
1108 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
1109 M_TEMP, M_NOWAIT)) == NULL) {
1110 free(ifgl, M_TEMP);
1111 IFNET_WUNLOCK();
1112 return (ENOMEM);
1113 }
1114
1115 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1116 if (!strcmp(ifg->ifg_group, groupname))
1117 break;
1118
1119 if (ifg == NULL) {
1120 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
1121 M_TEMP, M_NOWAIT)) == NULL) {
1122 free(ifgl, M_TEMP);
1123 free(ifgm, M_TEMP);
1124 IFNET_WUNLOCK();
1125 return (ENOMEM);
1126 }
1127 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1128 ifg->ifg_refcnt = 0;
1129 TAILQ_INIT(&ifg->ifg_members);
1130 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1131 new = 1;
1132 }
1133
1134 ifg->ifg_refcnt++;
1135 ifgl->ifgl_group = ifg;
1136 ifgm->ifgm_ifp = ifp;
1137
1138 IF_ADDR_WLOCK(ifp);
1139 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1140 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1141 IF_ADDR_WUNLOCK(ifp);
1142
1143 IFNET_WUNLOCK();
1144
1145 if (new)
1146 EVENTHANDLER_INVOKE(group_attach_event, ifg);
1147 EVENTHANDLER_INVOKE(group_change_event, groupname);
1148
1149 return (0);
1150 }
1151
1152 /*
1153 * Remove a group from an interface
1154 */
1155 int
1156 if_delgroup(struct ifnet *ifp, const char *groupname)
1157 {
1158 struct ifg_list *ifgl;
1159 struct ifg_member *ifgm;
1160
1161 IFNET_WLOCK();
1162 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1163 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
1164 break;
1165 if (ifgl == NULL) {
1166 IFNET_WUNLOCK();
1167 return (ENOENT);
1168 }
1169
1170 IF_ADDR_WLOCK(ifp);
1171 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1172 IF_ADDR_WUNLOCK(ifp);
1173
1174 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1175 if (ifgm->ifgm_ifp == ifp)
1176 break;
1177
1178 if (ifgm != NULL) {
1179 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
1180 free(ifgm, M_TEMP);
1181 }
1182
1183 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1184 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1185 IFNET_WUNLOCK();
1186 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1187 free(ifgl->ifgl_group, M_TEMP);
1188 } else
1189 IFNET_WUNLOCK();
1190
1191 free(ifgl, M_TEMP);
1192
1193 EVENTHANDLER_INVOKE(group_change_event, groupname);
1194
1195 return (0);
1196 }
1197
1198 /*
1199 * Remove an interface from all groups
1200 */
1201 static void
1202 if_delgroups(struct ifnet *ifp)
1203 {
1204 struct ifg_list *ifgl;
1205 struct ifg_member *ifgm;
1206 char groupname[IFNAMSIZ];
1207
1208 IFNET_WLOCK();
1209 while (!TAILQ_EMPTY(&ifp->if_groups)) {
1210 ifgl = TAILQ_FIRST(&ifp->if_groups);
1211
1212 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1213
1214 IF_ADDR_WLOCK(ifp);
1215 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1216 IF_ADDR_WUNLOCK(ifp);
1217
1218 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1219 if (ifgm->ifgm_ifp == ifp)
1220 break;
1221
1222 if (ifgm != NULL) {
1223 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1224 ifgm_next);
1225 free(ifgm, M_TEMP);
1226 }
1227
1228 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1229 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1230 IFNET_WUNLOCK();
1231 EVENTHANDLER_INVOKE(group_detach_event,
1232 ifgl->ifgl_group);
1233 free(ifgl->ifgl_group, M_TEMP);
1234 } else
1235 IFNET_WUNLOCK();
1236
1237 free(ifgl, M_TEMP);
1238
1239 EVENTHANDLER_INVOKE(group_change_event, groupname);
1240
1241 IFNET_WLOCK();
1242 }
1243 IFNET_WUNLOCK();
1244 }
1245
1246 /*
1247 * Stores all groups from an interface in memory pointed
1248 * to by data
1249 */
1250 static int
1251 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp)
1252 {
1253 int len, error;
1254 struct ifg_list *ifgl;
1255 struct ifg_req ifgrq, *ifgp;
1256 struct ifgroupreq *ifgr = data;
1257
1258 if (ifgr->ifgr_len == 0) {
1259 IF_ADDR_RLOCK(ifp);
1260 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1261 ifgr->ifgr_len += sizeof(struct ifg_req);
1262 IF_ADDR_RUNLOCK(ifp);
1263 return (0);
1264 }
1265
1266 len = ifgr->ifgr_len;
1267 ifgp = ifgr->ifgr_groups;
1268 /* XXX: wire */
1269 IF_ADDR_RLOCK(ifp);
1270 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1271 if (len < sizeof(ifgrq)) {
1272 IF_ADDR_RUNLOCK(ifp);
1273 return (EINVAL);
1274 }
1275 bzero(&ifgrq, sizeof ifgrq);
1276 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1277 sizeof(ifgrq.ifgrq_group));
1278 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1279 IF_ADDR_RUNLOCK(ifp);
1280 return (error);
1281 }
1282 len -= sizeof(ifgrq);
1283 ifgp++;
1284 }
1285 IF_ADDR_RUNLOCK(ifp);
1286
1287 return (0);
1288 }
1289
1290 /*
1291 * Stores all members of a group in memory pointed to by data
1292 */
1293 static int
1294 if_getgroupmembers(struct ifgroupreq *data)
1295 {
1296 struct ifgroupreq *ifgr = data;
1297 struct ifg_group *ifg;
1298 struct ifg_member *ifgm;
1299 struct ifg_req ifgrq, *ifgp;
1300 int len, error;
1301
1302 IFNET_RLOCK();
1303 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1304 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1305 break;
1306 if (ifg == NULL) {
1307 IFNET_RUNLOCK();
1308 return (ENOENT);
1309 }
1310
1311 if (ifgr->ifgr_len == 0) {
1312 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1313 ifgr->ifgr_len += sizeof(ifgrq);
1314 IFNET_RUNLOCK();
1315 return (0);
1316 }
1317
1318 len = ifgr->ifgr_len;
1319 ifgp = ifgr->ifgr_groups;
1320 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1321 if (len < sizeof(ifgrq)) {
1322 IFNET_RUNLOCK();
1323 return (EINVAL);
1324 }
1325 bzero(&ifgrq, sizeof ifgrq);
1326 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1327 sizeof(ifgrq.ifgrq_member));
1328 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1329 IFNET_RUNLOCK();
1330 return (error);
1331 }
1332 len -= sizeof(ifgrq);
1333 ifgp++;
1334 }
1335 IFNET_RUNLOCK();
1336
1337 return (0);
1338 }
1339
1340 /*
1341 * Delete Routes for a Network Interface
1342 *
1343 * Called for each routing entry via the rnh->rnh_walktree() call above
1344 * to delete all route entries referencing a detaching network interface.
1345 *
1346 * Arguments:
1347 * rn pointer to node in the routing table
1348 * arg argument passed to rnh->rnh_walktree() - detaching interface
1349 *
1350 * Returns:
1351 * 0 successful
1352 * errno failed - reason indicated
1353 *
1354 */
1355 static int
1356 if_rtdel(struct radix_node *rn, void *arg)
1357 {
1358 struct rtentry *rt = (struct rtentry *)rn;
1359 struct ifnet *ifp = arg;
1360 int err;
1361
1362 if (rt->rt_ifp == ifp) {
1363
1364 /*
1365 * Protect (sorta) against walktree recursion problems
1366 * with cloned routes
1367 */
1368 if ((rt->rt_flags & RTF_UP) == 0)
1369 return (0);
1370
1371 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1372 rt_mask(rt),
1373 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED,
1374 (struct rtentry **) NULL, rt->rt_fibnum);
1375 if (err) {
1376 log(LOG_WARNING, "if_rtdel: error %d\n", err);
1377 }
1378 }
1379
1380 return (0);
1381 }
1382
1383 /*
1384 * Wrapper functions for struct ifnet address list locking macros. These are
1385 * used by kernel modules to avoid encoding programming interface or binary
1386 * interface assumptions that may be violated when kernel-internal locking
1387 * approaches change.
1388 */
1389 void
1390 if_addr_rlock(struct ifnet *ifp)
1391 {
1392
1393 IF_ADDR_RLOCK(ifp);
1394 }
1395
1396 void
1397 if_addr_runlock(struct ifnet *ifp)
1398 {
1399
1400 IF_ADDR_RUNLOCK(ifp);
1401 }
1402
1403 void
1404 if_maddr_rlock(struct ifnet *ifp)
1405 {
1406
1407 IF_ADDR_RLOCK(ifp);
1408 }
1409
1410 void
1411 if_maddr_runlock(struct ifnet *ifp)
1412 {
1413
1414 IF_ADDR_RUNLOCK(ifp);
1415 }
1416
1417 /*
1418 * Initialization, destruction and refcounting functions for ifaddrs.
1419 */
1420 void
1421 ifa_init(struct ifaddr *ifa)
1422 {
1423
1424 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF);
1425 refcount_init(&ifa->ifa_refcnt, 1);
1426 ifa->if_data.ifi_datalen = sizeof(ifa->if_data);
1427 }
1428
1429 void
1430 ifa_ref(struct ifaddr *ifa)
1431 {
1432
1433 refcount_acquire(&ifa->ifa_refcnt);
1434 }
1435
1436 void
1437 ifa_free(struct ifaddr *ifa)
1438 {
1439
1440 if (refcount_release(&ifa->ifa_refcnt)) {
1441 mtx_destroy(&ifa->ifa_mtx);
1442 free(ifa, M_IFADDR);
1443 }
1444 }
1445
1446 int
1447 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1448 {
1449 int error = 0;
1450 struct rtentry *rt = NULL;
1451 struct rt_addrinfo info;
1452 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1453
1454 bzero(&info, sizeof(info));
1455 info.rti_ifp = V_loif;
1456 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1457 info.rti_info[RTAX_DST] = ia;
1458 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1459 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0);
1460
1461 if (error == 0 && rt != NULL) {
1462 RT_LOCK(rt);
1463 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1464 ifa->ifa_ifp->if_type;
1465 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1466 ifa->ifa_ifp->if_index;
1467 RT_REMREF(rt);
1468 RT_UNLOCK(rt);
1469 } else if (error != 0)
1470 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error);
1471
1472 return (error);
1473 }
1474
1475 int
1476 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1477 {
1478 int error = 0;
1479 struct rt_addrinfo info;
1480 struct sockaddr_dl null_sdl;
1481
1482 bzero(&null_sdl, sizeof(null_sdl));
1483 null_sdl.sdl_len = sizeof(null_sdl);
1484 null_sdl.sdl_family = AF_LINK;
1485 null_sdl.sdl_type = ifa->ifa_ifp->if_type;
1486 null_sdl.sdl_index = ifa->ifa_ifp->if_index;
1487 bzero(&info, sizeof(info));
1488 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1489 info.rti_info[RTAX_DST] = ia;
1490 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1491 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0);
1492
1493 if (error != 0)
1494 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error);
1495
1496 return (error);
1497 }
1498
1499 /*
1500 * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1501 * structs used to represent other address families, it is necessary
1502 * to perform a different comparison.
1503 */
1504
1505 #define sa_equal(a1, a2) \
1506 (bcmp((a1), (a2), ((a1))->sa_len) == 0)
1507
1508 #define sa_dl_equal(a1, a2) \
1509 ((((struct sockaddr_dl *)(a1))->sdl_len == \
1510 ((struct sockaddr_dl *)(a2))->sdl_len) && \
1511 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
1512 LLADDR((struct sockaddr_dl *)(a2)), \
1513 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1514
1515 /*
1516 * Locate an interface based on a complete address.
1517 */
1518 /*ARGSUSED*/
1519 static struct ifaddr *
1520 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref)
1521 {
1522 struct ifnet *ifp;
1523 struct ifaddr *ifa;
1524
1525 IFNET_RLOCK_NOSLEEP();
1526 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1527 IF_ADDR_RLOCK(ifp);
1528 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1529 if (ifa->ifa_addr->sa_family != addr->sa_family)
1530 continue;
1531 if (sa_equal(addr, ifa->ifa_addr)) {
1532 if (getref)
1533 ifa_ref(ifa);
1534 IF_ADDR_RUNLOCK(ifp);
1535 goto done;
1536 }
1537 /* IP6 doesn't have broadcast */
1538 if ((ifp->if_flags & IFF_BROADCAST) &&
1539 ifa->ifa_broadaddr &&
1540 ifa->ifa_broadaddr->sa_len != 0 &&
1541 sa_equal(ifa->ifa_broadaddr, addr)) {
1542 if (getref)
1543 ifa_ref(ifa);
1544 IF_ADDR_RUNLOCK(ifp);
1545 goto done;
1546 }
1547 }
1548 IF_ADDR_RUNLOCK(ifp);
1549 }
1550 ifa = NULL;
1551 done:
1552 IFNET_RUNLOCK_NOSLEEP();
1553 return (ifa);
1554 }
1555
1556 struct ifaddr *
1557 ifa_ifwithaddr(struct sockaddr *addr)
1558 {
1559
1560 return (ifa_ifwithaddr_internal(addr, 1));
1561 }
1562
1563 int
1564 ifa_ifwithaddr_check(struct sockaddr *addr)
1565 {
1566
1567 return (ifa_ifwithaddr_internal(addr, 0) != NULL);
1568 }
1569
1570 /*
1571 * Locate an interface based on the broadcast address.
1572 */
1573 /* ARGSUSED */
1574 struct ifaddr *
1575 ifa_ifwithbroadaddr(struct sockaddr *addr)
1576 {
1577 struct ifnet *ifp;
1578 struct ifaddr *ifa;
1579
1580 IFNET_RLOCK_NOSLEEP();
1581 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1582 IF_ADDR_RLOCK(ifp);
1583 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1584 if (ifa->ifa_addr->sa_family != addr->sa_family)
1585 continue;
1586 if ((ifp->if_flags & IFF_BROADCAST) &&
1587 ifa->ifa_broadaddr &&
1588 ifa->ifa_broadaddr->sa_len != 0 &&
1589 sa_equal(ifa->ifa_broadaddr, addr)) {
1590 ifa_ref(ifa);
1591 IF_ADDR_RUNLOCK(ifp);
1592 goto done;
1593 }
1594 }
1595 IF_ADDR_RUNLOCK(ifp);
1596 }
1597 ifa = NULL;
1598 done:
1599 IFNET_RUNLOCK_NOSLEEP();
1600 return (ifa);
1601 }
1602
1603 /*
1604 * Locate the point to point interface with a given destination address.
1605 */
1606 /*ARGSUSED*/
1607 struct ifaddr *
1608 ifa_ifwithdstaddr(struct sockaddr *addr)
1609 {
1610 struct ifnet *ifp;
1611 struct ifaddr *ifa;
1612
1613 IFNET_RLOCK_NOSLEEP();
1614 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1615 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1616 continue;
1617 IF_ADDR_RLOCK(ifp);
1618 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1619 if (ifa->ifa_addr->sa_family != addr->sa_family)
1620 continue;
1621 if (ifa->ifa_dstaddr != NULL &&
1622 sa_equal(addr, ifa->ifa_dstaddr)) {
1623 ifa_ref(ifa);
1624 IF_ADDR_RUNLOCK(ifp);
1625 goto done;
1626 }
1627 }
1628 IF_ADDR_RUNLOCK(ifp);
1629 }
1630 ifa = NULL;
1631 done:
1632 IFNET_RUNLOCK_NOSLEEP();
1633 return (ifa);
1634 }
1635
1636 /*
1637 * Find an interface on a specific network. If many, choice
1638 * is most specific found.
1639 */
1640 struct ifaddr *
1641 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp)
1642 {
1643 struct ifnet *ifp;
1644 struct ifaddr *ifa;
1645 struct ifaddr *ifa_maybe = NULL;
1646 u_int af = addr->sa_family;
1647 char *addr_data = addr->sa_data, *cplim;
1648
1649 /*
1650 * AF_LINK addresses can be looked up directly by their index number,
1651 * so do that if we can.
1652 */
1653 if (af == AF_LINK) {
1654 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1655 if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
1656 return (ifaddr_byindex(sdl->sdl_index));
1657 }
1658
1659 /*
1660 * Scan though each interface, looking for ones that have addresses
1661 * in this address family. Maintain a reference on ifa_maybe once
1662 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable
1663 * when we move onto the next interface.
1664 */
1665 IFNET_RLOCK_NOSLEEP();
1666 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1667 IF_ADDR_RLOCK(ifp);
1668 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1669 char *cp, *cp2, *cp3;
1670
1671 if (ifa->ifa_addr->sa_family != af)
1672 next: continue;
1673 if (af == AF_INET &&
1674 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1675 /*
1676 * This is a bit broken as it doesn't
1677 * take into account that the remote end may
1678 * be a single node in the network we are
1679 * looking for.
1680 * The trouble is that we don't know the
1681 * netmask for the remote end.
1682 */
1683 if (ifa->ifa_dstaddr != NULL &&
1684 sa_equal(addr, ifa->ifa_dstaddr)) {
1685 ifa_ref(ifa);
1686 IF_ADDR_RUNLOCK(ifp);
1687 goto done;
1688 }
1689 } else {
1690 /*
1691 * if we have a special address handler,
1692 * then use it instead of the generic one.
1693 */
1694 if (ifa->ifa_claim_addr) {
1695 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
1696 ifa_ref(ifa);
1697 IF_ADDR_RUNLOCK(ifp);
1698 goto done;
1699 }
1700 continue;
1701 }
1702
1703 /*
1704 * Scan all the bits in the ifa's address.
1705 * If a bit dissagrees with what we are
1706 * looking for, mask it with the netmask
1707 * to see if it really matters.
1708 * (A byte at a time)
1709 */
1710 if (ifa->ifa_netmask == 0)
1711 continue;
1712 cp = addr_data;
1713 cp2 = ifa->ifa_addr->sa_data;
1714 cp3 = ifa->ifa_netmask->sa_data;
1715 cplim = ifa->ifa_netmask->sa_len
1716 + (char *)ifa->ifa_netmask;
1717 while (cp3 < cplim)
1718 if ((*cp++ ^ *cp2++) & *cp3++)
1719 goto next; /* next address! */
1720 /*
1721 * If the netmask of what we just found
1722 * is more specific than what we had before
1723 * (if we had one), or if the virtual status
1724 * of new prefix is better than of the old one,
1725 * then remember the new one before continuing
1726 * to search for an even better one.
1727 */
1728 if (ifa_maybe == NULL ||
1729 ifa_preferred(ifa_maybe, ifa) ||
1730 rn_refines((caddr_t)ifa->ifa_netmask,
1731 (caddr_t)ifa_maybe->ifa_netmask)) {
1732 if (ifa_maybe != NULL)
1733 ifa_free(ifa_maybe);
1734 ifa_maybe = ifa;
1735 ifa_ref(ifa_maybe);
1736 }
1737 }
1738 }
1739 IF_ADDR_RUNLOCK(ifp);
1740 }
1741 ifa = ifa_maybe;
1742 ifa_maybe = NULL;
1743 done:
1744 IFNET_RUNLOCK_NOSLEEP();
1745 if (ifa_maybe != NULL)
1746 ifa_free(ifa_maybe);
1747 return (ifa);
1748 }
1749
1750 /*
1751 * Find an interface address specific to an interface best matching
1752 * a given address.
1753 */
1754 struct ifaddr *
1755 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1756 {
1757 struct ifaddr *ifa;
1758 char *cp, *cp2, *cp3;
1759 char *cplim;
1760 struct ifaddr *ifa_maybe = NULL;
1761 u_int af = addr->sa_family;
1762
1763 if (af >= AF_MAX)
1764 return (NULL);
1765 IF_ADDR_RLOCK(ifp);
1766 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1767 if (ifa->ifa_addr->sa_family != af)
1768 continue;
1769 if (ifa_maybe == NULL)
1770 ifa_maybe = ifa;
1771 if (ifa->ifa_netmask == 0) {
1772 if (sa_equal(addr, ifa->ifa_addr) ||
1773 (ifa->ifa_dstaddr &&
1774 sa_equal(addr, ifa->ifa_dstaddr)))
1775 goto done;
1776 continue;
1777 }
1778 if (ifp->if_flags & IFF_POINTOPOINT) {
1779 if (sa_equal(addr, ifa->ifa_dstaddr))
1780 goto done;
1781 } else {
1782 cp = addr->sa_data;
1783 cp2 = ifa->ifa_addr->sa_data;
1784 cp3 = ifa->ifa_netmask->sa_data;
1785 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1786 for (; cp3 < cplim; cp3++)
1787 if ((*cp++ ^ *cp2++) & *cp3)
1788 break;
1789 if (cp3 == cplim)
1790 goto done;
1791 }
1792 }
1793 ifa = ifa_maybe;
1794 done:
1795 if (ifa != NULL)
1796 ifa_ref(ifa);
1797 IF_ADDR_RUNLOCK(ifp);
1798 return (ifa);
1799 }
1800
1801 /*
1802 * See whether new ifa is better than current one:
1803 * 1) A non-virtual one is preferred over virtual.
1804 * 2) A virtual in master state preferred over any other state.
1805 *
1806 * Used in several address selecting functions.
1807 */
1808 int
1809 ifa_preferred(struct ifaddr *cur, struct ifaddr *next)
1810 {
1811
1812 return (cur->ifa_carp && (!next->ifa_carp ||
1813 ((*carp_master_p)(next) && !(*carp_master_p)(cur))));
1814 }
1815
1816 #include <net/if_llatbl.h>
1817
1818 /*
1819 * Default action when installing a route with a Link Level gateway.
1820 * Lookup an appropriate real ifa to point to.
1821 * This should be moved to /sys/net/link.c eventually.
1822 */
1823 static void
1824 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
1825 {
1826 struct ifaddr *ifa, *oifa;
1827 struct sockaddr *dst;
1828 struct ifnet *ifp;
1829
1830 RT_LOCK_ASSERT(rt);
1831
1832 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
1833 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
1834 return;
1835 ifa = ifaof_ifpforaddr(dst, ifp);
1836 if (ifa) {
1837 oifa = rt->rt_ifa;
1838 rt->rt_ifa = ifa;
1839 ifa_free(oifa);
1840 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
1841 ifa->ifa_rtrequest(cmd, rt, info);
1842 }
1843 }
1844
1845 /*
1846 * Mark an interface down and notify protocols of
1847 * the transition.
1848 */
1849 static void
1850 if_unroute(struct ifnet *ifp, int flag, int fam)
1851 {
1852 struct ifaddr *ifa;
1853
1854 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
1855
1856 ifp->if_flags &= ~flag;
1857 getmicrotime(&ifp->if_lastchange);
1858 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1859 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1860 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1861 ifp->if_qflush(ifp);
1862
1863 if (ifp->if_carp)
1864 (*carp_linkstate_p)(ifp);
1865 rt_ifmsg(ifp);
1866 }
1867
1868 /*
1869 * Mark an interface up and notify protocols of
1870 * the transition.
1871 */
1872 static void
1873 if_route(struct ifnet *ifp, int flag, int fam)
1874 {
1875 struct ifaddr *ifa;
1876
1877 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
1878
1879 ifp->if_flags |= flag;
1880 getmicrotime(&ifp->if_lastchange);
1881 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1882 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1883 pfctlinput(PRC_IFUP, ifa->ifa_addr);
1884 if (ifp->if_carp)
1885 (*carp_linkstate_p)(ifp);
1886 rt_ifmsg(ifp);
1887 #ifdef INET6
1888 in6_if_up(ifp);
1889 #endif
1890 }
1891
1892 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */
1893 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
1894 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
1895 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
1896 int (*vlan_tag_p)(struct ifnet *, uint16_t *);
1897 int (*vlan_setcookie_p)(struct ifnet *, void *);
1898 void *(*vlan_cookie_p)(struct ifnet *);
1899
1900 /*
1901 * Handle a change in the interface link state. To avoid LORs
1902 * between driver lock and upper layer locks, as well as possible
1903 * recursions, we post event to taskqueue, and all job
1904 * is done in static do_link_state_change().
1905 */
1906 void
1907 if_link_state_change(struct ifnet *ifp, int link_state)
1908 {
1909 /* Return if state hasn't changed. */
1910 if (ifp->if_link_state == link_state)
1911 return;
1912
1913 ifp->if_link_state = link_state;
1914
1915 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
1916 }
1917
1918 static void
1919 do_link_state_change(void *arg, int pending)
1920 {
1921 struct ifnet *ifp = (struct ifnet *)arg;
1922 int link_state = ifp->if_link_state;
1923 CURVNET_SET(ifp->if_vnet);
1924
1925 /* Notify that the link state has changed. */
1926 rt_ifmsg(ifp);
1927 if (ifp->if_vlantrunk != NULL)
1928 (*vlan_link_state_p)(ifp);
1929
1930 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
1931 IFP2AC(ifp)->ac_netgraph != NULL)
1932 (*ng_ether_link_state_p)(ifp, link_state);
1933 if (ifp->if_carp)
1934 (*carp_linkstate_p)(ifp);
1935 if (ifp->if_bridge)
1936 (*bridge_linkstate_p)(ifp);
1937 if (ifp->if_lagg)
1938 (*lagg_linkstate_p)(ifp, link_state);
1939
1940 if (IS_DEFAULT_VNET(curvnet))
1941 devctl_notify("IFNET", ifp->if_xname,
1942 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
1943 NULL);
1944 if (pending > 1)
1945 if_printf(ifp, "%d link states coalesced\n", pending);
1946 if (log_link_state_change)
1947 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
1948 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
1949 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state);
1950 CURVNET_RESTORE();
1951 }
1952
1953 /*
1954 * Mark an interface down and notify protocols of
1955 * the transition.
1956 */
1957 void
1958 if_down(struct ifnet *ifp)
1959 {
1960
1961 if_unroute(ifp, IFF_UP, AF_UNSPEC);
1962 }
1963
1964 /*
1965 * Mark an interface up and notify protocols of
1966 * the transition.
1967 */
1968 void
1969 if_up(struct ifnet *ifp)
1970 {
1971
1972 if_route(ifp, IFF_UP, AF_UNSPEC);
1973 }
1974
1975 /*
1976 * Flush an interface queue.
1977 */
1978 void
1979 if_qflush(struct ifnet *ifp)
1980 {
1981 struct mbuf *m, *n;
1982 struct ifaltq *ifq;
1983
1984 ifq = &ifp->if_snd;
1985 IFQ_LOCK(ifq);
1986 #ifdef ALTQ
1987 if (ALTQ_IS_ENABLED(ifq))
1988 ALTQ_PURGE(ifq);
1989 #endif
1990 n = ifq->ifq_head;
1991 while ((m = n) != 0) {
1992 n = m->m_act;
1993 m_freem(m);
1994 }
1995 ifq->ifq_head = 0;
1996 ifq->ifq_tail = 0;
1997 ifq->ifq_len = 0;
1998 IFQ_UNLOCK(ifq);
1999 }
2000
2001 /*
2002 * Map interface name to interface structure pointer, with or without
2003 * returning a reference.
2004 */
2005 struct ifnet *
2006 ifunit_ref(const char *name)
2007 {
2008 struct ifnet *ifp;
2009
2010 IFNET_RLOCK_NOSLEEP();
2011 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2012 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2013 !(ifp->if_flags & IFF_DYING))
2014 break;
2015 }
2016 if (ifp != NULL)
2017 if_ref(ifp);
2018 IFNET_RUNLOCK_NOSLEEP();
2019 return (ifp);
2020 }
2021
2022 struct ifnet *
2023 ifunit(const char *name)
2024 {
2025 struct ifnet *ifp;
2026
2027 IFNET_RLOCK_NOSLEEP();
2028 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2029 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2030 break;
2031 }
2032 IFNET_RUNLOCK_NOSLEEP();
2033 return (ifp);
2034 }
2035
2036 /*
2037 * Hardware specific interface ioctls.
2038 */
2039 static int
2040 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2041 {
2042 struct ifreq *ifr;
2043 struct ifstat *ifs;
2044 int error = 0;
2045 int new_flags, temp_flags;
2046 size_t namelen, onamelen;
2047 size_t descrlen;
2048 char *descrbuf, *odescrbuf;
2049 char new_name[IFNAMSIZ];
2050 struct ifaddr *ifa;
2051 struct sockaddr_dl *sdl;
2052
2053 ifr = (struct ifreq *)data;
2054 switch (cmd) {
2055 case SIOCGIFINDEX:
2056 ifr->ifr_index = ifp->if_index;
2057 break;
2058
2059 case SIOCGIFFLAGS:
2060 temp_flags = ifp->if_flags | ifp->if_drv_flags;
2061 ifr->ifr_flags = temp_flags & 0xffff;
2062 ifr->ifr_flagshigh = temp_flags >> 16;
2063 break;
2064
2065 case SIOCGIFCAP:
2066 ifr->ifr_reqcap = ifp->if_capabilities;
2067 ifr->ifr_curcap = ifp->if_capenable;
2068 break;
2069
2070 #ifdef MAC
2071 case SIOCGIFMAC:
2072 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2073 break;
2074 #endif
2075
2076 case SIOCGIFMETRIC:
2077 ifr->ifr_metric = ifp->if_metric;
2078 break;
2079
2080 case SIOCGIFMTU:
2081 ifr->ifr_mtu = ifp->if_mtu;
2082 break;
2083
2084 case SIOCGIFPHYS:
2085 ifr->ifr_phys = ifp->if_physical;
2086 break;
2087
2088 case SIOCGIFDESCR:
2089 error = 0;
2090 sx_slock(&ifdescr_sx);
2091 if (ifp->if_description == NULL)
2092 error = ENOMSG;
2093 else {
2094 /* space for terminating nul */
2095 descrlen = strlen(ifp->if_description) + 1;
2096 if (ifr->ifr_buffer.length < descrlen)
2097 ifr->ifr_buffer.buffer = NULL;
2098 else
2099 error = copyout(ifp->if_description,
2100 ifr->ifr_buffer.buffer, descrlen);
2101 ifr->ifr_buffer.length = descrlen;
2102 }
2103 sx_sunlock(&ifdescr_sx);
2104 break;
2105
2106 case SIOCSIFDESCR:
2107 error = priv_check(td, PRIV_NET_SETIFDESCR);
2108 if (error)
2109 return (error);
2110
2111 /*
2112 * Copy only (length-1) bytes to make sure that
2113 * if_description is always nul terminated. The
2114 * length parameter is supposed to count the
2115 * terminating nul in.
2116 */
2117 if (ifr->ifr_buffer.length > ifdescr_maxlen)
2118 return (ENAMETOOLONG);
2119 else if (ifr->ifr_buffer.length == 0)
2120 descrbuf = NULL;
2121 else {
2122 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR,
2123 M_WAITOK | M_ZERO);
2124 error = copyin(ifr->ifr_buffer.buffer, descrbuf,
2125 ifr->ifr_buffer.length - 1);
2126 if (error) {
2127 free(descrbuf, M_IFDESCR);
2128 break;
2129 }
2130 }
2131
2132 sx_xlock(&ifdescr_sx);
2133 odescrbuf = ifp->if_description;
2134 ifp->if_description = descrbuf;
2135 sx_xunlock(&ifdescr_sx);
2136
2137 getmicrotime(&ifp->if_lastchange);
2138 free(odescrbuf, M_IFDESCR);
2139 break;
2140
2141 case SIOCGIFFIB:
2142 ifr->ifr_fib = ifp->if_fib;
2143 break;
2144
2145 case SIOCSIFFIB:
2146 error = priv_check(td, PRIV_NET_SETIFFIB);
2147 if (error)
2148 return (error);
2149 if (ifr->ifr_fib >= rt_numfibs)
2150 return (EINVAL);
2151
2152 ifp->if_fib = ifr->ifr_fib;
2153 break;
2154
2155 case SIOCSIFFLAGS:
2156 error = priv_check(td, PRIV_NET_SETIFFLAGS);
2157 if (error)
2158 return (error);
2159 /*
2160 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2161 * check, so we don't need special handling here yet.
2162 */
2163 new_flags = (ifr->ifr_flags & 0xffff) |
2164 (ifr->ifr_flagshigh << 16);
2165 if (ifp->if_flags & IFF_SMART) {
2166 /* Smart drivers twiddle their own routes */
2167 } else if (ifp->if_flags & IFF_UP &&
2168 (new_flags & IFF_UP) == 0) {
2169 if_down(ifp);
2170 } else if (new_flags & IFF_UP &&
2171 (ifp->if_flags & IFF_UP) == 0) {
2172 if_up(ifp);
2173 }
2174 /* See if permanently promiscuous mode bit is about to flip */
2175 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2176 if (new_flags & IFF_PPROMISC)
2177 ifp->if_flags |= IFF_PROMISC;
2178 else if (ifp->if_pcount == 0)
2179 ifp->if_flags &= ~IFF_PROMISC;
2180 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
2181 ifp->if_xname,
2182 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
2183 }
2184 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2185 (new_flags &~ IFF_CANTCHANGE);
2186 if (ifp->if_ioctl) {
2187 (void) (*ifp->if_ioctl)(ifp, cmd, data);
2188 }
2189 getmicrotime(&ifp->if_lastchange);
2190 break;
2191
2192 case SIOCSIFCAP:
2193 error = priv_check(td, PRIV_NET_SETIFCAP);
2194 if (error)
2195 return (error);
2196 if (ifp->if_ioctl == NULL)
2197 return (EOPNOTSUPP);
2198 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2199 return (EINVAL);
2200 error = (*ifp->if_ioctl)(ifp, cmd, data);
2201 if (error == 0)
2202 getmicrotime(&ifp->if_lastchange);
2203 break;
2204
2205 #ifdef MAC
2206 case SIOCSIFMAC:
2207 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2208 break;
2209 #endif
2210
2211 case SIOCSIFNAME:
2212 error = priv_check(td, PRIV_NET_SETIFNAME);
2213 if (error)
2214 return (error);
2215 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
2216 if (error != 0)
2217 return (error);
2218 if (new_name[0] == '\0')
2219 return (EINVAL);
2220 if (ifunit(new_name) != NULL)
2221 return (EEXIST);
2222
2223 /*
2224 * XXX: Locking. Nothing else seems to lock if_flags,
2225 * and there are numerous other races with the
2226 * ifunit() checks not being atomic with namespace
2227 * changes (renames, vmoves, if_attach, etc).
2228 */
2229 ifp->if_flags |= IFF_RENAMING;
2230
2231 /* Announce the departure of the interface. */
2232 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2233 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2234
2235 log(LOG_INFO, "%s: changing name to '%s'\n",
2236 ifp->if_xname, new_name);
2237
2238 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2239 ifa = ifp->if_addr;
2240 IFA_LOCK(ifa);
2241 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2242 namelen = strlen(new_name);
2243 onamelen = sdl->sdl_nlen;
2244 /*
2245 * Move the address if needed. This is safe because we
2246 * allocate space for a name of length IFNAMSIZ when we
2247 * create this in if_attach().
2248 */
2249 if (namelen != onamelen) {
2250 bcopy(sdl->sdl_data + onamelen,
2251 sdl->sdl_data + namelen, sdl->sdl_alen);
2252 }
2253 bcopy(new_name, sdl->sdl_data, namelen);
2254 sdl->sdl_nlen = namelen;
2255 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2256 bzero(sdl->sdl_data, onamelen);
2257 while (namelen != 0)
2258 sdl->sdl_data[--namelen] = 0xff;
2259 IFA_UNLOCK(ifa);
2260
2261 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2262 /* Announce the return of the interface. */
2263 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2264
2265 ifp->if_flags &= ~IFF_RENAMING;
2266 break;
2267
2268 #ifdef VIMAGE
2269 case SIOCSIFVNET:
2270 error = priv_check(td, PRIV_NET_SETIFVNET);
2271 if (error)
2272 return (error);
2273 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2274 break;
2275 #endif
2276
2277 case SIOCSIFMETRIC:
2278 error = priv_check(td, PRIV_NET_SETIFMETRIC);
2279 if (error)
2280 return (error);
2281 ifp->if_metric = ifr->ifr_metric;
2282 getmicrotime(&ifp->if_lastchange);
2283 break;
2284
2285 case SIOCSIFPHYS:
2286 error = priv_check(td, PRIV_NET_SETIFPHYS);
2287 if (error)
2288 return (error);
2289 if (ifp->if_ioctl == NULL)
2290 return (EOPNOTSUPP);
2291 error = (*ifp->if_ioctl)(ifp, cmd, data);
2292 if (error == 0)
2293 getmicrotime(&ifp->if_lastchange);
2294 break;
2295
2296 case SIOCSIFMTU:
2297 {
2298 u_long oldmtu = ifp->if_mtu;
2299
2300 error = priv_check(td, PRIV_NET_SETIFMTU);
2301 if (error)
2302 return (error);
2303 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2304 return (EINVAL);
2305 if (ifp->if_ioctl == NULL)
2306 return (EOPNOTSUPP);
2307 error = (*ifp->if_ioctl)(ifp, cmd, data);
2308 if (error == 0) {
2309 getmicrotime(&ifp->if_lastchange);
2310 rt_ifmsg(ifp);
2311 }
2312 /*
2313 * If the link MTU changed, do network layer specific procedure.
2314 */
2315 if (ifp->if_mtu != oldmtu) {
2316 #ifdef INET6
2317 nd6_setmtu(ifp);
2318 #endif
2319 }
2320 break;
2321 }
2322
2323 case SIOCADDMULTI:
2324 case SIOCDELMULTI:
2325 if (cmd == SIOCADDMULTI)
2326 error = priv_check(td, PRIV_NET_ADDMULTI);
2327 else
2328 error = priv_check(td, PRIV_NET_DELMULTI);
2329 if (error)
2330 return (error);
2331
2332 /* Don't allow group membership on non-multicast interfaces. */
2333 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2334 return (EOPNOTSUPP);
2335
2336 /* Don't let users screw up protocols' entries. */
2337 if (ifr->ifr_addr.sa_family != AF_LINK)
2338 return (EINVAL);
2339
2340 if (cmd == SIOCADDMULTI) {
2341 struct ifmultiaddr *ifma;
2342
2343 /*
2344 * Userland is only permitted to join groups once
2345 * via the if_addmulti() KPI, because it cannot hold
2346 * struct ifmultiaddr * between calls. It may also
2347 * lose a race while we check if the membership
2348 * already exists.
2349 */
2350 IF_ADDR_RLOCK(ifp);
2351 ifma = if_findmulti(ifp, &ifr->ifr_addr);
2352 IF_ADDR_RUNLOCK(ifp);
2353 if (ifma != NULL)
2354 error = EADDRINUSE;
2355 else
2356 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2357 } else {
2358 error = if_delmulti(ifp, &ifr->ifr_addr);
2359 }
2360 if (error == 0)
2361 getmicrotime(&ifp->if_lastchange);
2362 break;
2363
2364 case SIOCSIFPHYADDR:
2365 case SIOCDIFPHYADDR:
2366 #ifdef INET6
2367 case SIOCSIFPHYADDR_IN6:
2368 #endif
2369 case SIOCSLIFPHYADDR:
2370 case SIOCSIFMEDIA:
2371 case SIOCSIFGENERIC:
2372 error = priv_check(td, PRIV_NET_HWIOCTL);
2373 if (error)
2374 return (error);
2375 if (ifp->if_ioctl == NULL)
2376 return (EOPNOTSUPP);
2377 error = (*ifp->if_ioctl)(ifp, cmd, data);
2378 if (error == 0)
2379 getmicrotime(&ifp->if_lastchange);
2380 break;
2381
2382 case SIOCGIFSTATUS:
2383 ifs = (struct ifstat *)data;
2384 ifs->ascii[0] = '\0';
2385
2386 case SIOCGIFPSRCADDR:
2387 case SIOCGIFPDSTADDR:
2388 case SIOCGLIFPHYADDR:
2389 case SIOCGIFMEDIA:
2390 case SIOCGIFGENERIC:
2391 if (ifp->if_ioctl == NULL)
2392 return (EOPNOTSUPP);
2393 error = (*ifp->if_ioctl)(ifp, cmd, data);
2394 break;
2395
2396 case SIOCSIFLLADDR:
2397 error = priv_check(td, PRIV_NET_SETLLADDR);
2398 if (error)
2399 return (error);
2400 error = if_setlladdr(ifp,
2401 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2402 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
2403 break;
2404
2405 case SIOCAIFGROUP:
2406 {
2407 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2408
2409 error = priv_check(td, PRIV_NET_ADDIFGROUP);
2410 if (error)
2411 return (error);
2412 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
2413 return (error);
2414 break;
2415 }
2416
2417 case SIOCGIFGROUP:
2418 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
2419 return (error);
2420 break;
2421
2422 case SIOCDIFGROUP:
2423 {
2424 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2425
2426 error = priv_check(td, PRIV_NET_DELIFGROUP);
2427 if (error)
2428 return (error);
2429 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
2430 return (error);
2431 break;
2432 }
2433
2434 default:
2435 error = ENOIOCTL;
2436 break;
2437 }
2438 return (error);
2439 }
2440
2441 #ifdef COMPAT_FREEBSD32
2442 struct ifconf32 {
2443 int32_t ifc_len;
2444 union {
2445 uint32_t ifcu_buf;
2446 uint32_t ifcu_req;
2447 } ifc_ifcu;
2448 };
2449 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32)
2450 #endif
2451
2452 /*
2453 * Interface ioctls.
2454 */
2455 int
2456 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2457 {
2458 struct ifnet *ifp;
2459 struct ifreq *ifr;
2460 int error;
2461 int oif_flags;
2462
2463 CURVNET_SET(so->so_vnet);
2464 switch (cmd) {
2465 case SIOCGIFCONF:
2466 case OSIOCGIFCONF:
2467 error = ifconf(cmd, data);
2468 CURVNET_RESTORE();
2469 return (error);
2470
2471 #ifdef COMPAT_FREEBSD32
2472 case SIOCGIFCONF32:
2473 {
2474 struct ifconf32 *ifc32;
2475 struct ifconf ifc;
2476
2477 ifc32 = (struct ifconf32 *)data;
2478 ifc.ifc_len = ifc32->ifc_len;
2479 ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2480
2481 error = ifconf(SIOCGIFCONF, (void *)&ifc);
2482 CURVNET_RESTORE();
2483 if (error == 0)
2484 ifc32->ifc_len = ifc.ifc_len;
2485 return (error);
2486 }
2487 #endif
2488 }
2489 ifr = (struct ifreq *)data;
2490
2491 switch (cmd) {
2492 #ifdef VIMAGE
2493 case SIOCSIFRVNET:
2494 error = priv_check(td, PRIV_NET_SETIFVNET);
2495 if (error == 0)
2496 error = if_vmove_reclaim(td, ifr->ifr_name,
2497 ifr->ifr_jid);
2498 CURVNET_RESTORE();
2499 return (error);
2500 #endif
2501 case SIOCIFCREATE:
2502 case SIOCIFCREATE2:
2503 error = priv_check(td, PRIV_NET_IFCREATE);
2504 if (error == 0)
2505 error = if_clone_create(ifr->ifr_name,
2506 sizeof(ifr->ifr_name),
2507 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL);
2508 CURVNET_RESTORE();
2509 return (error);
2510 case SIOCIFDESTROY:
2511 error = priv_check(td, PRIV_NET_IFDESTROY);
2512 if (error == 0)
2513 error = if_clone_destroy(ifr->ifr_name);
2514 CURVNET_RESTORE();
2515 return (error);
2516
2517 case SIOCIFGCLONERS:
2518 error = if_clone_list((struct if_clonereq *)data);
2519 CURVNET_RESTORE();
2520 return (error);
2521 case SIOCGIFGMEMB:
2522 error = if_getgroupmembers((struct ifgroupreq *)data);
2523 CURVNET_RESTORE();
2524 return (error);
2525 #if defined(INET) || defined(INET6)
2526 case SIOCSVH:
2527 case SIOCGVH:
2528 if (carp_ioctl_p == NULL)
2529 error = EPROTONOSUPPORT;
2530 else
2531 error = (*carp_ioctl_p)(ifr, cmd, td);
2532 CURVNET_RESTORE();
2533 return (error);
2534 #endif
2535 }
2536
2537 ifp = ifunit_ref(ifr->ifr_name);
2538 if (ifp == NULL) {
2539 CURVNET_RESTORE();
2540 return (ENXIO);
2541 }
2542
2543 error = ifhwioctl(cmd, ifp, data, td);
2544 if (error != ENOIOCTL) {
2545 if_rele(ifp);
2546 CURVNET_RESTORE();
2547 return (error);
2548 }
2549
2550 oif_flags = ifp->if_flags;
2551 if (so->so_proto == NULL) {
2552 if_rele(ifp);
2553 CURVNET_RESTORE();
2554 return (EOPNOTSUPP);
2555 }
2556
2557 /*
2558 * Pass the request on to the socket control method, and if the
2559 * latter returns EOPNOTSUPP, directly to the interface.
2560 *
2561 * Make an exception for the legacy SIOCSIF* requests. Drivers
2562 * trust SIOCSIFADDR et al to come from an already privileged
2563 * layer, and do not perform any credentials checks or input
2564 * validation.
2565 */
2566 #ifndef COMPAT_43
2567 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2568 data,
2569 ifp, td));
2570 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
2571 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2572 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2573 error = (*ifp->if_ioctl)(ifp, cmd, data);
2574 #else
2575 {
2576 u_long ocmd = cmd;
2577
2578 switch (cmd) {
2579
2580 case SIOCSIFDSTADDR:
2581 case SIOCSIFADDR:
2582 case SIOCSIFBRDADDR:
2583 case SIOCSIFNETMASK:
2584 #if BYTE_ORDER != BIG_ENDIAN
2585 if (ifr->ifr_addr.sa_family == 0 &&
2586 ifr->ifr_addr.sa_len < 16) {
2587 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2588 ifr->ifr_addr.sa_len = 16;
2589 }
2590 #else
2591 if (ifr->ifr_addr.sa_len == 0)
2592 ifr->ifr_addr.sa_len = 16;
2593 #endif
2594 break;
2595
2596 case OSIOCGIFADDR:
2597 cmd = SIOCGIFADDR;
2598 break;
2599
2600 case OSIOCGIFDSTADDR:
2601 cmd = SIOCGIFDSTADDR;
2602 break;
2603
2604 case OSIOCGIFBRDADDR:
2605 cmd = SIOCGIFBRDADDR;
2606 break;
2607
2608 case OSIOCGIFNETMASK:
2609 cmd = SIOCGIFNETMASK;
2610 }
2611 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2612 cmd,
2613 data,
2614 ifp, td));
2615 if (error == EOPNOTSUPP && ifp != NULL &&
2616 ifp->if_ioctl != NULL &&
2617 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
2618 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
2619 error = (*ifp->if_ioctl)(ifp, cmd, data);
2620 switch (ocmd) {
2621
2622 case OSIOCGIFADDR:
2623 case OSIOCGIFDSTADDR:
2624 case OSIOCGIFBRDADDR:
2625 case OSIOCGIFNETMASK:
2626 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2627
2628 }
2629 }
2630 #endif /* COMPAT_43 */
2631
2632 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2633 #ifdef INET6
2634 if (ifp->if_flags & IFF_UP)
2635 in6_if_up(ifp);
2636 #endif
2637 }
2638 if_rele(ifp);
2639 CURVNET_RESTORE();
2640 return (error);
2641 }
2642
2643 /*
2644 * The code common to handling reference counted flags,
2645 * e.g., in ifpromisc() and if_allmulti().
2646 * The "pflag" argument can specify a permanent mode flag to check,
2647 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2648 *
2649 * Only to be used on stack-owned flags, not driver-owned flags.
2650 */
2651 static int
2652 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2653 {
2654 struct ifreq ifr;
2655 int error;
2656 int oldflags, oldcount;
2657
2658 /* Sanity checks to catch programming errors */
2659 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2660 ("%s: setting driver-owned flag %d", __func__, flag));
2661
2662 if (onswitch)
2663 KASSERT(*refcount >= 0,
2664 ("%s: increment negative refcount %d for flag %d",
2665 __func__, *refcount, flag));
2666 else
2667 KASSERT(*refcount > 0,
2668 ("%s: decrement non-positive refcount %d for flag %d",
2669 __func__, *refcount, flag));
2670
2671 /* In case this mode is permanent, just touch refcount */
2672 if (ifp->if_flags & pflag) {
2673 *refcount += onswitch ? 1 : -1;
2674 return (0);
2675 }
2676
2677 /* Save ifnet parameters for if_ioctl() may fail */
2678 oldcount = *refcount;
2679 oldflags = ifp->if_flags;
2680
2681 /*
2682 * See if we aren't the only and touching refcount is enough.
2683 * Actually toggle interface flag if we are the first or last.
2684 */
2685 if (onswitch) {
2686 if ((*refcount)++)
2687 return (0);
2688 ifp->if_flags |= flag;
2689 } else {
2690 if (--(*refcount))
2691 return (0);
2692 ifp->if_flags &= ~flag;
2693 }
2694
2695 /* Call down the driver since we've changed interface flags */
2696 if (ifp->if_ioctl == NULL) {
2697 error = EOPNOTSUPP;
2698 goto recover;
2699 }
2700 ifr.ifr_flags = ifp->if_flags & 0xffff;
2701 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2702 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2703 if (error)
2704 goto recover;
2705 /* Notify userland that interface flags have changed */
2706 rt_ifmsg(ifp);
2707 return (0);
2708
2709 recover:
2710 /* Recover after driver error */
2711 *refcount = oldcount;
2712 ifp->if_flags = oldflags;
2713 return (error);
2714 }
2715
2716 /*
2717 * Set/clear promiscuous mode on interface ifp based on the truth value
2718 * of pswitch. The calls are reference counted so that only the first
2719 * "on" request actually has an effect, as does the final "off" request.
2720 * Results are undefined if the "off" and "on" requests are not matched.
2721 */
2722 int
2723 ifpromisc(struct ifnet *ifp, int pswitch)
2724 {
2725 int error;
2726 int oldflags = ifp->if_flags;
2727
2728 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2729 &ifp->if_pcount, pswitch);
2730 /* If promiscuous mode status has changed, log a message */
2731 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2732 log(LOG_INFO, "%s: promiscuous mode %s\n",
2733 ifp->if_xname,
2734 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2735 return (error);
2736 }
2737
2738 /*
2739 * Return interface configuration
2740 * of system. List may be used
2741 * in later ioctl's (above) to get
2742 * other information.
2743 */
2744 /*ARGSUSED*/
2745 static int
2746 ifconf(u_long cmd, caddr_t data)
2747 {
2748 struct ifconf *ifc = (struct ifconf *)data;
2749 struct ifnet *ifp;
2750 struct ifaddr *ifa;
2751 struct ifreq ifr;
2752 struct sbuf *sb;
2753 int error, full = 0, valid_len, max_len;
2754
2755 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2756 max_len = MAXPHYS - 1;
2757
2758 /* Prevent hostile input from being able to crash the system */
2759 if (ifc->ifc_len <= 0)
2760 return (EINVAL);
2761
2762 again:
2763 if (ifc->ifc_len <= max_len) {
2764 max_len = ifc->ifc_len;
2765 full = 1;
2766 }
2767 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2768 max_len = 0;
2769 valid_len = 0;
2770
2771 IFNET_RLOCK();
2772 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2773 int addrs;
2774
2775 /*
2776 * Zero the ifr_name buffer to make sure we don't
2777 * disclose the contents of the stack.
2778 */
2779 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2780
2781 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2782 >= sizeof(ifr.ifr_name)) {
2783 sbuf_delete(sb);
2784 IFNET_RUNLOCK();
2785 return (ENAMETOOLONG);
2786 }
2787
2788 addrs = 0;
2789 IF_ADDR_RLOCK(ifp);
2790 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2791 struct sockaddr *sa = ifa->ifa_addr;
2792
2793 if (prison_if(curthread->td_ucred, sa) != 0)
2794 continue;
2795 addrs++;
2796 #ifdef COMPAT_43
2797 if (cmd == OSIOCGIFCONF) {
2798 struct osockaddr *osa =
2799 (struct osockaddr *)&ifr.ifr_addr;
2800 ifr.ifr_addr = *sa;
2801 osa->sa_family = sa->sa_family;
2802 sbuf_bcat(sb, &ifr, sizeof(ifr));
2803 max_len += sizeof(ifr);
2804 } else
2805 #endif
2806 if (sa->sa_len <= sizeof(*sa)) {
2807 ifr.ifr_addr = *sa;
2808 sbuf_bcat(sb, &ifr, sizeof(ifr));
2809 max_len += sizeof(ifr);
2810 } else {
2811 sbuf_bcat(sb, &ifr,
2812 offsetof(struct ifreq, ifr_addr));
2813 max_len += offsetof(struct ifreq, ifr_addr);
2814 sbuf_bcat(sb, sa, sa->sa_len);
2815 max_len += sa->sa_len;
2816 }
2817
2818 if (sbuf_error(sb) == 0)
2819 valid_len = sbuf_len(sb);
2820 }
2821 IF_ADDR_RUNLOCK(ifp);
2822 if (addrs == 0) {
2823 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
2824 sbuf_bcat(sb, &ifr, sizeof(ifr));
2825 max_len += sizeof(ifr);
2826
2827 if (sbuf_error(sb) == 0)
2828 valid_len = sbuf_len(sb);
2829 }
2830 }
2831 IFNET_RUNLOCK();
2832
2833 /*
2834 * If we didn't allocate enough space (uncommon), try again. If
2835 * we have already allocated as much space as we are allowed,
2836 * return what we've got.
2837 */
2838 if (valid_len != max_len && !full) {
2839 sbuf_delete(sb);
2840 goto again;
2841 }
2842
2843 ifc->ifc_len = valid_len;
2844 sbuf_finish(sb);
2845 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
2846 sbuf_delete(sb);
2847 return (error);
2848 }
2849
2850 /*
2851 * Just like ifpromisc(), but for all-multicast-reception mode.
2852 */
2853 int
2854 if_allmulti(struct ifnet *ifp, int onswitch)
2855 {
2856
2857 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
2858 }
2859
2860 struct ifmultiaddr *
2861 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
2862 {
2863 struct ifmultiaddr *ifma;
2864
2865 IF_ADDR_LOCK_ASSERT(ifp);
2866
2867 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2868 if (sa->sa_family == AF_LINK) {
2869 if (sa_dl_equal(ifma->ifma_addr, sa))
2870 break;
2871 } else {
2872 if (sa_equal(ifma->ifma_addr, sa))
2873 break;
2874 }
2875 }
2876
2877 return ifma;
2878 }
2879
2880 /*
2881 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
2882 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
2883 * the ifnet multicast address list here, so the caller must do that and
2884 * other setup work (such as notifying the device driver). The reference
2885 * count is initialized to 1.
2886 */
2887 static struct ifmultiaddr *
2888 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
2889 int mflags)
2890 {
2891 struct ifmultiaddr *ifma;
2892 struct sockaddr *dupsa;
2893
2894 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
2895 M_ZERO);
2896 if (ifma == NULL)
2897 return (NULL);
2898
2899 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
2900 if (dupsa == NULL) {
2901 free(ifma, M_IFMADDR);
2902 return (NULL);
2903 }
2904 bcopy(sa, dupsa, sa->sa_len);
2905 ifma->ifma_addr = dupsa;
2906
2907 ifma->ifma_ifp = ifp;
2908 ifma->ifma_refcount = 1;
2909 ifma->ifma_protospec = NULL;
2910
2911 if (llsa == NULL) {
2912 ifma->ifma_lladdr = NULL;
2913 return (ifma);
2914 }
2915
2916 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
2917 if (dupsa == NULL) {
2918 free(ifma->ifma_addr, M_IFMADDR);
2919 free(ifma, M_IFMADDR);
2920 return (NULL);
2921 }
2922 bcopy(llsa, dupsa, llsa->sa_len);
2923 ifma->ifma_lladdr = dupsa;
2924
2925 return (ifma);
2926 }
2927
2928 /*
2929 * if_freemulti: free ifmultiaddr structure and possibly attached related
2930 * addresses. The caller is responsible for implementing reference
2931 * counting, notifying the driver, handling routing messages, and releasing
2932 * any dependent link layer state.
2933 */
2934 static void
2935 if_freemulti(struct ifmultiaddr *ifma)
2936 {
2937
2938 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
2939 ifma->ifma_refcount));
2940 KASSERT(ifma->ifma_protospec == NULL,
2941 ("if_freemulti: protospec not NULL"));
2942
2943 if (ifma->ifma_lladdr != NULL)
2944 free(ifma->ifma_lladdr, M_IFMADDR);
2945 free(ifma->ifma_addr, M_IFMADDR);
2946 free(ifma, M_IFMADDR);
2947 }
2948
2949 /*
2950 * Register an additional multicast address with a network interface.
2951 *
2952 * - If the address is already present, bump the reference count on the
2953 * address and return.
2954 * - If the address is not link-layer, look up a link layer address.
2955 * - Allocate address structures for one or both addresses, and attach to the
2956 * multicast address list on the interface. If automatically adding a link
2957 * layer address, the protocol address will own a reference to the link
2958 * layer address, to be freed when it is freed.
2959 * - Notify the network device driver of an addition to the multicast address
2960 * list.
2961 *
2962 * 'sa' points to caller-owned memory with the desired multicast address.
2963 *
2964 * 'retifma' will be used to return a pointer to the resulting multicast
2965 * address reference, if desired.
2966 */
2967 int
2968 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
2969 struct ifmultiaddr **retifma)
2970 {
2971 struct ifmultiaddr *ifma, *ll_ifma;
2972 struct sockaddr *llsa;
2973 int error;
2974
2975 /*
2976 * If the address is already present, return a new reference to it;
2977 * otherwise, allocate storage and set up a new address.
2978 */
2979 IF_ADDR_WLOCK(ifp);
2980 ifma = if_findmulti(ifp, sa);
2981 if (ifma != NULL) {
2982 ifma->ifma_refcount++;
2983 if (retifma != NULL)
2984 *retifma = ifma;
2985 IF_ADDR_WUNLOCK(ifp);
2986 return (0);
2987 }
2988
2989 /*
2990 * The address isn't already present; resolve the protocol address
2991 * into a link layer address, and then look that up, bump its
2992 * refcount or allocate an ifma for that also. If 'llsa' was
2993 * returned, we will need to free it later.
2994 */
2995 llsa = NULL;
2996 ll_ifma = NULL;
2997 if (ifp->if_resolvemulti != NULL) {
2998 error = ifp->if_resolvemulti(ifp, &llsa, sa);
2999 if (error)
3000 goto unlock_out;
3001 }
3002
3003 /*
3004 * Allocate the new address. Don't hook it up yet, as we may also
3005 * need to allocate a link layer multicast address.
3006 */
3007 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3008 if (ifma == NULL) {
3009 error = ENOMEM;
3010 goto free_llsa_out;
3011 }
3012
3013 /*
3014 * If a link layer address is found, we'll need to see if it's
3015 * already present in the address list, or allocate is as well.
3016 * When this block finishes, the link layer address will be on the
3017 * list.
3018 */
3019 if (llsa != NULL) {
3020 ll_ifma = if_findmulti(ifp, llsa);
3021 if (ll_ifma == NULL) {
3022 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3023 if (ll_ifma == NULL) {
3024 --ifma->ifma_refcount;
3025 if_freemulti(ifma);
3026 error = ENOMEM;
3027 goto free_llsa_out;
3028 }
3029 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3030 ifma_link);
3031 } else
3032 ll_ifma->ifma_refcount++;
3033 ifma->ifma_llifma = ll_ifma;
3034 }
3035
3036 /*
3037 * We now have a new multicast address, ifma, and possibly a new or
3038 * referenced link layer address. Add the primary address to the
3039 * ifnet address list.
3040 */
3041 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3042
3043 if (retifma != NULL)
3044 *retifma = ifma;
3045
3046 /*
3047 * Must generate the message while holding the lock so that 'ifma'
3048 * pointer is still valid.
3049 */
3050 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3051 IF_ADDR_WUNLOCK(ifp);
3052
3053 /*
3054 * We are certain we have added something, so call down to the
3055 * interface to let them know about it.
3056 */
3057 if (ifp->if_ioctl != NULL) {
3058 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3059 }
3060
3061 if (llsa != NULL)
3062 free(llsa, M_IFMADDR);
3063
3064 return (0);
3065
3066 free_llsa_out:
3067 if (llsa != NULL)
3068 free(llsa, M_IFMADDR);
3069
3070 unlock_out:
3071 IF_ADDR_WUNLOCK(ifp);
3072 return (error);
3073 }
3074
3075 /*
3076 * Delete a multicast group membership by network-layer group address.
3077 *
3078 * Returns ENOENT if the entry could not be found. If ifp no longer
3079 * exists, results are undefined. This entry point should only be used
3080 * from subsystems which do appropriate locking to hold ifp for the
3081 * duration of the call.
3082 * Network-layer protocol domains must use if_delmulti_ifma().
3083 */
3084 int
3085 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3086 {
3087 struct ifmultiaddr *ifma;
3088 int lastref;
3089 #ifdef INVARIANTS
3090 struct ifnet *oifp;
3091
3092 IFNET_RLOCK_NOSLEEP();
3093 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3094 if (ifp == oifp)
3095 break;
3096 if (ifp != oifp)
3097 ifp = NULL;
3098 IFNET_RUNLOCK_NOSLEEP();
3099
3100 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
3101 #endif
3102 if (ifp == NULL)
3103 return (ENOENT);
3104
3105 IF_ADDR_WLOCK(ifp);
3106 lastref = 0;
3107 ifma = if_findmulti(ifp, sa);
3108 if (ifma != NULL)
3109 lastref = if_delmulti_locked(ifp, ifma, 0);
3110 IF_ADDR_WUNLOCK(ifp);
3111
3112 if (ifma == NULL)
3113 return (ENOENT);
3114
3115 if (lastref && ifp->if_ioctl != NULL) {
3116 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3117 }
3118
3119 return (0);
3120 }
3121
3122 /*
3123 * Delete all multicast group membership for an interface.
3124 * Should be used to quickly flush all multicast filters.
3125 */
3126 void
3127 if_delallmulti(struct ifnet *ifp)
3128 {
3129 struct ifmultiaddr *ifma;
3130 struct ifmultiaddr *next;
3131
3132 IF_ADDR_WLOCK(ifp);
3133 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3134 if_delmulti_locked(ifp, ifma, 0);
3135 IF_ADDR_WUNLOCK(ifp);
3136 }
3137
3138 /*
3139 * Delete a multicast group membership by group membership pointer.
3140 * Network-layer protocol domains must use this routine.
3141 *
3142 * It is safe to call this routine if the ifp disappeared.
3143 */
3144 void
3145 if_delmulti_ifma(struct ifmultiaddr *ifma)
3146 {
3147 struct ifnet *ifp;
3148 int lastref;
3149
3150 ifp = ifma->ifma_ifp;
3151 #ifdef DIAGNOSTIC
3152 if (ifp == NULL) {
3153 printf("%s: ifma_ifp seems to be detached\n", __func__);
3154 } else {
3155 struct ifnet *oifp;
3156
3157 IFNET_RLOCK_NOSLEEP();
3158 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3159 if (ifp == oifp)
3160 break;
3161 if (ifp != oifp) {
3162 printf("%s: ifnet %p disappeared\n", __func__, ifp);
3163 ifp = NULL;
3164 }
3165 IFNET_RUNLOCK_NOSLEEP();
3166 }
3167 #endif
3168 /*
3169 * If and only if the ifnet instance exists: Acquire the address lock.
3170 */
3171 if (ifp != NULL)
3172 IF_ADDR_WLOCK(ifp);
3173
3174 lastref = if_delmulti_locked(ifp, ifma, 0);
3175
3176 if (ifp != NULL) {
3177 /*
3178 * If and only if the ifnet instance exists:
3179 * Release the address lock.
3180 * If the group was left: update the hardware hash filter.
3181 */
3182 IF_ADDR_WUNLOCK(ifp);
3183 if (lastref && ifp->if_ioctl != NULL) {
3184 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3185 }
3186 }
3187 }
3188
3189 /*
3190 * Perform deletion of network-layer and/or link-layer multicast address.
3191 *
3192 * Return 0 if the reference count was decremented.
3193 * Return 1 if the final reference was released, indicating that the
3194 * hardware hash filter should be reprogrammed.
3195 */
3196 static int
3197 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3198 {
3199 struct ifmultiaddr *ll_ifma;
3200
3201 if (ifp != NULL && ifma->ifma_ifp != NULL) {
3202 KASSERT(ifma->ifma_ifp == ifp,
3203 ("%s: inconsistent ifp %p", __func__, ifp));
3204 IF_ADDR_WLOCK_ASSERT(ifp);
3205 }
3206
3207 ifp = ifma->ifma_ifp;
3208
3209 /*
3210 * If the ifnet is detaching, null out references to ifnet,
3211 * so that upper protocol layers will notice, and not attempt
3212 * to obtain locks for an ifnet which no longer exists. The
3213 * routing socket announcement must happen before the ifnet
3214 * instance is detached from the system.
3215 */
3216 if (detaching) {
3217 #ifdef DIAGNOSTIC
3218 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3219 #endif
3220 /*
3221 * ifp may already be nulled out if we are being reentered
3222 * to delete the ll_ifma.
3223 */
3224 if (ifp != NULL) {
3225 rt_newmaddrmsg(RTM_DELMADDR, ifma);
3226 ifma->ifma_ifp = NULL;
3227 }
3228 }
3229
3230 if (--ifma->ifma_refcount > 0)
3231 return 0;
3232
3233 /*
3234 * If this ifma is a network-layer ifma, a link-layer ifma may
3235 * have been associated with it. Release it first if so.
3236 */
3237 ll_ifma = ifma->ifma_llifma;
3238 if (ll_ifma != NULL) {
3239 KASSERT(ifma->ifma_lladdr != NULL,
3240 ("%s: llifma w/o lladdr", __func__));
3241 if (detaching)
3242 ll_ifma->ifma_ifp = NULL; /* XXX */
3243 if (--ll_ifma->ifma_refcount == 0) {
3244 if (ifp != NULL) {
3245 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
3246 ifma_link);
3247 }
3248 if_freemulti(ll_ifma);
3249 }
3250 }
3251
3252 if (ifp != NULL)
3253 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
3254
3255 if_freemulti(ifma);
3256
3257 /*
3258 * The last reference to this instance of struct ifmultiaddr
3259 * was released; the hardware should be notified of this change.
3260 */
3261 return 1;
3262 }
3263
3264 /*
3265 * Set the link layer address on an interface.
3266 *
3267 * At this time we only support certain types of interfaces,
3268 * and we don't allow the length of the address to change.
3269 */
3270 int
3271 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3272 {
3273 struct sockaddr_dl *sdl;
3274 struct ifaddr *ifa;
3275 struct ifreq ifr;
3276
3277 IF_ADDR_RLOCK(ifp);
3278 ifa = ifp->if_addr;
3279 if (ifa == NULL) {
3280 IF_ADDR_RUNLOCK(ifp);
3281 return (EINVAL);
3282 }
3283 ifa_ref(ifa);
3284 IF_ADDR_RUNLOCK(ifp);
3285 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3286 if (sdl == NULL) {
3287 ifa_free(ifa);
3288 return (EINVAL);
3289 }
3290 if (len != sdl->sdl_alen) { /* don't allow length to change */
3291 ifa_free(ifa);
3292 return (EINVAL);
3293 }
3294 switch (ifp->if_type) {
3295 case IFT_ETHER:
3296 case IFT_FDDI:
3297 case IFT_XETHER:
3298 case IFT_ISO88025:
3299 case IFT_L2VLAN:
3300 case IFT_BRIDGE:
3301 case IFT_ARCNET:
3302 case IFT_IEEE8023ADLAG:
3303 case IFT_IEEE80211:
3304 bcopy(lladdr, LLADDR(sdl), len);
3305 ifa_free(ifa);
3306 break;
3307 default:
3308 ifa_free(ifa);
3309 return (ENODEV);
3310 }
3311
3312 /*
3313 * If the interface is already up, we need
3314 * to re-init it in order to reprogram its
3315 * address filter.
3316 */
3317 if ((ifp->if_flags & IFF_UP) != 0) {
3318 if (ifp->if_ioctl) {
3319 ifp->if_flags &= ~IFF_UP;
3320 ifr.ifr_flags = ifp->if_flags & 0xffff;
3321 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3322 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3323 ifp->if_flags |= IFF_UP;
3324 ifr.ifr_flags = ifp->if_flags & 0xffff;
3325 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3326 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3327 }
3328 #ifdef INET
3329 /*
3330 * Also send gratuitous ARPs to notify other nodes about
3331 * the address change.
3332 */
3333 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3334 if (ifa->ifa_addr->sa_family == AF_INET)
3335 arp_ifinit(ifp, ifa);
3336 }
3337 #endif
3338 }
3339 return (0);
3340 }
3341
3342 /*
3343 * The name argument must be a pointer to storage which will last as
3344 * long as the interface does. For physical devices, the result of
3345 * device_get_name(dev) is a good choice and for pseudo-devices a
3346 * static string works well.
3347 */
3348 void
3349 if_initname(struct ifnet *ifp, const char *name, int unit)
3350 {
3351 ifp->if_dname = name;
3352 ifp->if_dunit = unit;
3353 if (unit != IF_DUNIT_NONE)
3354 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3355 else
3356 strlcpy(ifp->if_xname, name, IFNAMSIZ);
3357 }
3358
3359 int
3360 if_printf(struct ifnet *ifp, const char * fmt, ...)
3361 {
3362 va_list ap;
3363 int retval;
3364
3365 retval = printf("%s: ", ifp->if_xname);
3366 va_start(ap, fmt);
3367 retval += vprintf(fmt, ap);
3368 va_end(ap);
3369 return (retval);
3370 }
3371
3372 void
3373 if_start(struct ifnet *ifp)
3374 {
3375
3376 (*(ifp)->if_start)(ifp);
3377 }
3378
3379 /*
3380 * Backwards compatibility interface for drivers
3381 * that have not implemented it
3382 */
3383 static int
3384 if_transmit(struct ifnet *ifp, struct mbuf *m)
3385 {
3386 int error;
3387
3388 IFQ_HANDOFF(ifp, m, error);
3389 return (error);
3390 }
3391
3392 int
3393 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
3394 {
3395 int active = 0;
3396
3397 IF_LOCK(ifq);
3398 if (_IF_QFULL(ifq)) {
3399 _IF_DROP(ifq);
3400 IF_UNLOCK(ifq);
3401 m_freem(m);
3402 return (0);
3403 }
3404 if (ifp != NULL) {
3405 ifp->if_obytes += m->m_pkthdr.len + adjust;
3406 if (m->m_flags & (M_BCAST|M_MCAST))
3407 ifp->if_omcasts++;
3408 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
3409 }
3410 _IF_ENQUEUE(ifq, m);
3411 IF_UNLOCK(ifq);
3412 if (ifp != NULL && !active)
3413 (*(ifp)->if_start)(ifp);
3414 return (1);
3415 }
3416
3417 void
3418 if_register_com_alloc(u_char type,
3419 if_com_alloc_t *a, if_com_free_t *f)
3420 {
3421
3422 KASSERT(if_com_alloc[type] == NULL,
3423 ("if_register_com_alloc: %d already registered", type));
3424 KASSERT(if_com_free[type] == NULL,
3425 ("if_register_com_alloc: %d free already registered", type));
3426
3427 if_com_alloc[type] = a;
3428 if_com_free[type] = f;
3429 }
3430
3431 void
3432 if_deregister_com_alloc(u_char type)
3433 {
3434
3435 KASSERT(if_com_alloc[type] != NULL,
3436 ("if_deregister_com_alloc: %d not registered", type));
3437 KASSERT(if_com_free[type] != NULL,
3438 ("if_deregister_com_alloc: %d free not registered", type));
3439 if_com_alloc[type] = NULL;
3440 if_com_free[type] = NULL;
3441 }
Cache object: e9bcd8c592e2e7a05f8d70d4dedd3ce1
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