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/9.0/sys/net/if.c 223735 2011-07-03 12:22:02Z bz $
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 /*XXX*/
78 #include <netinet/in.h>
79 #include <netinet/in_var.h>
80 #include <netinet/ip_carp.h>
81 #ifdef INET6
82 #include <netinet6/in6_var.h>
83 #include <netinet6/in6_ifattach.h>
84 #endif
85 #endif
86 #ifdef INET
87 #include <netinet/if_ether.h>
88 #endif
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 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 (*bstp_linkstate_p)(struct ifnet *ifp, int state);
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 #if defined(INET) || defined(INET6)
133 struct ifnet *(*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
134 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
135 struct sockaddr *sa, struct rtentry *rt);
136 #endif
137 #ifdef INET
138 int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *,
139 u_int8_t **);
140 #endif
141 #ifdef INET6
142 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
143 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
144 const struct in6_addr *taddr);
145 #endif
146
147 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
148
149 /*
150 * XXX: Style; these should be sorted alphabetically, and unprototyped
151 * static functions should be prototyped. Currently they are sorted by
152 * declaration order.
153 */
154 static void if_attachdomain(void *);
155 static void if_attachdomain1(struct ifnet *);
156 static int ifconf(u_long, caddr_t);
157 static void if_freemulti(struct ifmultiaddr *);
158 static void if_init(void *);
159 static void if_grow(void);
160 static void if_route(struct ifnet *, int flag, int fam);
161 static int if_setflag(struct ifnet *, int, int, int *, int);
162 static int if_transmit(struct ifnet *ifp, struct mbuf *m);
163 static void if_unroute(struct ifnet *, int flag, int fam);
164 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
165 static int if_rtdel(struct radix_node *, void *);
166 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
167 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
168 static void do_link_state_change(void *, int);
169 static int if_getgroup(struct ifgroupreq *, struct ifnet *);
170 static int if_getgroupmembers(struct ifgroupreq *);
171 static void if_delgroups(struct ifnet *);
172 static void if_attach_internal(struct ifnet *, int);
173 static void if_detach_internal(struct ifnet *, int);
174
175 #ifdef INET6
176 /*
177 * XXX: declare here to avoid to include many inet6 related files..
178 * should be more generalized?
179 */
180 extern void nd6_setmtu(struct ifnet *);
181 #endif
182
183 VNET_DEFINE(int, if_index);
184 int ifqmaxlen = IFQ_MAXLEN;
185 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */
186 VNET_DEFINE(struct ifgrouphead, ifg_head);
187
188 static VNET_DEFINE(int, if_indexlim) = 8;
189
190 /* Table of ifnet by index. */
191 VNET_DEFINE(struct ifindex_entry *, ifindex_table);
192
193 #define V_if_indexlim VNET(if_indexlim)
194 #define V_ifindex_table VNET(ifindex_table)
195
196 /*
197 * The global network interface list (V_ifnet) and related state (such as
198 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and
199 * an rwlock. Either may be acquired shared to stablize the list, but both
200 * must be acquired writable to modify the list. This model allows us to
201 * both stablize the interface list during interrupt thread processing, but
202 * also to stablize it over long-running ioctls, without introducing priority
203 * inversions and deadlocks.
204 */
205 struct rwlock ifnet_rwlock;
206 struct sx ifnet_sxlock;
207
208 /*
209 * The allocation of network interfaces is a rather non-atomic affair; we
210 * need to select an index before we are ready to expose the interface for
211 * use, so will use this pointer value to indicate reservation.
212 */
213 #define IFNET_HOLD (void *)(uintptr_t)(-1)
214
215 static if_com_alloc_t *if_com_alloc[256];
216 static if_com_free_t *if_com_free[256];
217
218 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
219 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
220 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
221
222 struct ifnet *
223 ifnet_byindex_locked(u_short idx)
224 {
225
226 if (idx > V_if_index)
227 return (NULL);
228 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD)
229 return (NULL);
230 return (V_ifindex_table[idx].ife_ifnet);
231 }
232
233 struct ifnet *
234 ifnet_byindex(u_short idx)
235 {
236 struct ifnet *ifp;
237
238 IFNET_RLOCK_NOSLEEP();
239 ifp = ifnet_byindex_locked(idx);
240 IFNET_RUNLOCK_NOSLEEP();
241 return (ifp);
242 }
243
244 struct ifnet *
245 ifnet_byindex_ref(u_short idx)
246 {
247 struct ifnet *ifp;
248
249 IFNET_RLOCK_NOSLEEP();
250 ifp = ifnet_byindex_locked(idx);
251 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) {
252 IFNET_RUNLOCK_NOSLEEP();
253 return (NULL);
254 }
255 if_ref(ifp);
256 IFNET_RUNLOCK_NOSLEEP();
257 return (ifp);
258 }
259
260 /*
261 * Allocate an ifindex array entry; return 0 on success or an error on
262 * failure.
263 */
264 static int
265 ifindex_alloc_locked(u_short *idxp)
266 {
267 u_short idx;
268
269 IFNET_WLOCK_ASSERT();
270
271 retry:
272 /*
273 * Try to find an empty slot below V_if_index. If we fail, take the
274 * next slot.
275 */
276 for (idx = 1; idx <= V_if_index; idx++) {
277 if (V_ifindex_table[idx].ife_ifnet == NULL)
278 break;
279 }
280
281 /* Catch if_index overflow. */
282 if (idx < 1)
283 return (ENOSPC);
284 if (idx >= V_if_indexlim) {
285 if_grow();
286 goto retry;
287 }
288 if (idx > V_if_index)
289 V_if_index = idx;
290 *idxp = idx;
291 return (0);
292 }
293
294 static void
295 ifindex_free_locked(u_short idx)
296 {
297
298 IFNET_WLOCK_ASSERT();
299
300 V_ifindex_table[idx].ife_ifnet = NULL;
301 while (V_if_index > 0 &&
302 V_ifindex_table[V_if_index].ife_ifnet == NULL)
303 V_if_index--;
304 }
305
306 static void
307 ifindex_free(u_short idx)
308 {
309
310 IFNET_WLOCK();
311 ifindex_free_locked(idx);
312 IFNET_WUNLOCK();
313 }
314
315 static void
316 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp)
317 {
318
319 IFNET_WLOCK_ASSERT();
320
321 V_ifindex_table[idx].ife_ifnet = ifp;
322 }
323
324 static void
325 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
326 {
327
328 IFNET_WLOCK();
329 ifnet_setbyindex_locked(idx, ifp);
330 IFNET_WUNLOCK();
331 }
332
333 struct ifaddr *
334 ifaddr_byindex(u_short idx)
335 {
336 struct ifaddr *ifa;
337
338 IFNET_RLOCK_NOSLEEP();
339 ifa = ifnet_byindex_locked(idx)->if_addr;
340 if (ifa != NULL)
341 ifa_ref(ifa);
342 IFNET_RUNLOCK_NOSLEEP();
343 return (ifa);
344 }
345
346 /*
347 * Network interface utility routines.
348 *
349 * Routines with ifa_ifwith* names take sockaddr *'s as
350 * parameters.
351 */
352
353 static void
354 vnet_if_init(const void *unused __unused)
355 {
356
357 TAILQ_INIT(&V_ifnet);
358 TAILQ_INIT(&V_ifg_head);
359 IFNET_WLOCK();
360 if_grow(); /* create initial table */
361 IFNET_WUNLOCK();
362 vnet_if_clone_init();
363 }
364 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
365 NULL);
366
367 /* ARGSUSED*/
368 static void
369 if_init(void *dummy __unused)
370 {
371
372 IFNET_LOCK_INIT();
373 if_clone_init();
374 }
375 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL);
376
377
378 #ifdef VIMAGE
379 static void
380 vnet_if_uninit(const void *unused __unused)
381 {
382
383 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
384 "not empty", __func__, __LINE__, &V_ifnet));
385 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
386 "not empty", __func__, __LINE__, &V_ifg_head));
387
388 free((caddr_t)V_ifindex_table, M_IFNET);
389 }
390 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
391 vnet_if_uninit, NULL);
392 #endif
393
394 static void
395 if_grow(void)
396 {
397 int oldlim;
398 u_int n;
399 struct ifindex_entry *e;
400
401 IFNET_WLOCK_ASSERT();
402 oldlim = V_if_indexlim;
403 IFNET_WUNLOCK();
404 n = (oldlim << 1) * sizeof(*e);
405 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
406 IFNET_WLOCK();
407 if (V_if_indexlim != oldlim) {
408 free(e, M_IFNET);
409 return;
410 }
411 if (V_ifindex_table != NULL) {
412 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2);
413 free((caddr_t)V_ifindex_table, M_IFNET);
414 }
415 V_if_indexlim <<= 1;
416 V_ifindex_table = e;
417 }
418
419 /*
420 * Allocate a struct ifnet and an index for an interface. A layer 2
421 * common structure will also be allocated if an allocation routine is
422 * registered for the passed type.
423 */
424 struct ifnet *
425 if_alloc(u_char type)
426 {
427 struct ifnet *ifp;
428 u_short idx;
429
430 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
431 IFNET_WLOCK();
432 if (ifindex_alloc_locked(&idx) != 0) {
433 IFNET_WUNLOCK();
434 free(ifp, M_IFNET);
435 return (NULL);
436 }
437 ifnet_setbyindex_locked(idx, IFNET_HOLD);
438 IFNET_WUNLOCK();
439 ifp->if_index = idx;
440 ifp->if_type = type;
441 ifp->if_alloctype = type;
442 if (if_com_alloc[type] != NULL) {
443 ifp->if_l2com = if_com_alloc[type](type, ifp);
444 if (ifp->if_l2com == NULL) {
445 free(ifp, M_IFNET);
446 ifindex_free(idx);
447 return (NULL);
448 }
449 }
450
451 IF_ADDR_LOCK_INIT(ifp);
452 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
453 ifp->if_afdata_initialized = 0;
454 IF_AFDATA_LOCK_INIT(ifp);
455 TAILQ_INIT(&ifp->if_addrhead);
456 TAILQ_INIT(&ifp->if_prefixhead);
457 TAILQ_INIT(&ifp->if_multiaddrs);
458 TAILQ_INIT(&ifp->if_groups);
459 #ifdef MAC
460 mac_ifnet_init(ifp);
461 #endif
462 ifq_init(&ifp->if_snd, ifp);
463
464 refcount_init(&ifp->if_refcount, 1); /* Index reference. */
465 ifnet_setbyindex(ifp->if_index, ifp);
466 return (ifp);
467 }
468
469 /*
470 * Do the actual work of freeing a struct ifnet, and layer 2 common
471 * structure. This call is made when the last reference to an
472 * interface is released.
473 */
474 static void
475 if_free_internal(struct ifnet *ifp)
476 {
477
478 KASSERT((ifp->if_flags & IFF_DYING),
479 ("if_free_internal: interface not dying"));
480
481 if (if_com_free[ifp->if_alloctype] != NULL)
482 if_com_free[ifp->if_alloctype](ifp->if_l2com,
483 ifp->if_alloctype);
484
485 #ifdef MAC
486 mac_ifnet_destroy(ifp);
487 #endif /* MAC */
488 if (ifp->if_description != NULL)
489 free(ifp->if_description, M_IFDESCR);
490 IF_AFDATA_DESTROY(ifp);
491 IF_ADDR_LOCK_DESTROY(ifp);
492 ifq_delete(&ifp->if_snd);
493 free(ifp, M_IFNET);
494 }
495
496 /*
497 * This version should only be called by intefaces that switch their type
498 * after calling if_alloc(). if_free_type() will go away again now that we
499 * have if_alloctype to cache the original allocation type. For now, assert
500 * that they match, since we require that in practice.
501 */
502 void
503 if_free_type(struct ifnet *ifp, u_char type)
504 {
505
506 KASSERT(ifp->if_alloctype == type,
507 ("if_free_type: type (%d) != alloctype (%d)", type,
508 ifp->if_alloctype));
509
510 ifp->if_flags |= IFF_DYING; /* XXX: Locking */
511
512 IFNET_WLOCK();
513 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index),
514 ("%s: freeing unallocated ifnet", ifp->if_xname));
515
516 ifindex_free_locked(ifp->if_index);
517 IFNET_WUNLOCK();
518
519 if (!refcount_release(&ifp->if_refcount))
520 return;
521 if_free_internal(ifp);
522 }
523
524 /*
525 * This is the normal version of if_free(), used by device drivers to free a
526 * detached network interface. The contents of if_free_type() will move into
527 * here when if_free_type() goes away.
528 */
529 void
530 if_free(struct ifnet *ifp)
531 {
532
533 if_free_type(ifp, ifp->if_alloctype);
534 }
535
536 /*
537 * Interfaces to keep an ifnet type-stable despite the possibility of the
538 * driver calling if_free(). If there are additional references, we defer
539 * freeing the underlying data structure.
540 */
541 void
542 if_ref(struct ifnet *ifp)
543 {
544
545 /* We don't assert the ifnet list lock here, but arguably should. */
546 refcount_acquire(&ifp->if_refcount);
547 }
548
549 void
550 if_rele(struct ifnet *ifp)
551 {
552
553 if (!refcount_release(&ifp->if_refcount))
554 return;
555 if_free_internal(ifp);
556 }
557
558 void
559 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
560 {
561
562 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
563
564 if (ifq->ifq_maxlen == 0)
565 ifq->ifq_maxlen = ifqmaxlen;
566
567 ifq->altq_type = 0;
568 ifq->altq_disc = NULL;
569 ifq->altq_flags &= ALTQF_CANTCHANGE;
570 ifq->altq_tbr = NULL;
571 ifq->altq_ifp = ifp;
572 }
573
574 void
575 ifq_delete(struct ifaltq *ifq)
576 {
577 mtx_destroy(&ifq->ifq_mtx);
578 }
579
580 /*
581 * Perform generic interface initalization tasks and attach the interface
582 * to the list of "active" interfaces. If vmove flag is set on entry
583 * to if_attach_internal(), perform only a limited subset of initialization
584 * tasks, given that we are moving from one vnet to another an ifnet which
585 * has already been fully initialized.
586 *
587 * XXX:
588 * - The decision to return void and thus require this function to
589 * succeed is questionable.
590 * - We should probably do more sanity checking. For instance we don't
591 * do anything to insure if_xname is unique or non-empty.
592 */
593 void
594 if_attach(struct ifnet *ifp)
595 {
596
597 if_attach_internal(ifp, 0);
598 }
599
600 static void
601 if_attach_internal(struct ifnet *ifp, int vmove)
602 {
603 unsigned socksize, ifasize;
604 int namelen, masklen;
605 struct sockaddr_dl *sdl;
606 struct ifaddr *ifa;
607
608 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
609 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
610 ifp->if_xname);
611
612 #ifdef VIMAGE
613 ifp->if_vnet = curvnet;
614 if (ifp->if_home_vnet == NULL)
615 ifp->if_home_vnet = curvnet;
616 #endif
617
618 if_addgroup(ifp, IFG_ALL);
619
620 getmicrotime(&ifp->if_lastchange);
621 ifp->if_data.ifi_epoch = time_uptime;
622 ifp->if_data.ifi_datalen = sizeof(struct if_data);
623
624 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
625 (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
626 ("transmit and qflush must both either be set or both be NULL"));
627 if (ifp->if_transmit == NULL) {
628 ifp->if_transmit = if_transmit;
629 ifp->if_qflush = if_qflush;
630 }
631
632 if (!vmove) {
633 #ifdef MAC
634 mac_ifnet_create(ifp);
635 #endif
636
637 /*
638 * Create a Link Level name for this device.
639 */
640 namelen = strlen(ifp->if_xname);
641 /*
642 * Always save enough space for any possiable name so we
643 * can do a rename in place later.
644 */
645 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
646 socksize = masklen + ifp->if_addrlen;
647 if (socksize < sizeof(*sdl))
648 socksize = sizeof(*sdl);
649 socksize = roundup2(socksize, sizeof(long));
650 ifasize = sizeof(*ifa) + 2 * socksize;
651 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
652 ifa_init(ifa);
653 sdl = (struct sockaddr_dl *)(ifa + 1);
654 sdl->sdl_len = socksize;
655 sdl->sdl_family = AF_LINK;
656 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
657 sdl->sdl_nlen = namelen;
658 sdl->sdl_index = ifp->if_index;
659 sdl->sdl_type = ifp->if_type;
660 ifp->if_addr = ifa;
661 ifa->ifa_ifp = ifp;
662 ifa->ifa_rtrequest = link_rtrequest;
663 ifa->ifa_addr = (struct sockaddr *)sdl;
664 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
665 ifa->ifa_netmask = (struct sockaddr *)sdl;
666 sdl->sdl_len = masklen;
667 while (namelen != 0)
668 sdl->sdl_data[--namelen] = 0xff;
669 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
670 /* Reliably crash if used uninitialized. */
671 ifp->if_broadcastaddr = NULL;
672 }
673 #ifdef VIMAGE
674 else {
675 /*
676 * Update the interface index in the link layer address
677 * of the interface.
678 */
679 for (ifa = ifp->if_addr; ifa != NULL;
680 ifa = TAILQ_NEXT(ifa, ifa_link)) {
681 if (ifa->ifa_addr->sa_family == AF_LINK) {
682 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
683 sdl->sdl_index = ifp->if_index;
684 }
685 }
686 }
687 #endif
688
689 IFNET_WLOCK();
690 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
691 #ifdef VIMAGE
692 curvnet->vnet_ifcnt++;
693 #endif
694 IFNET_WUNLOCK();
695
696 if (domain_init_status >= 2)
697 if_attachdomain1(ifp);
698
699 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
700 if (IS_DEFAULT_VNET(curvnet))
701 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
702
703 /* Announce the interface. */
704 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
705 }
706
707 static void
708 if_attachdomain(void *dummy)
709 {
710 struct ifnet *ifp;
711 int s;
712
713 s = splnet();
714 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
715 if_attachdomain1(ifp);
716 splx(s);
717 }
718 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
719 if_attachdomain, NULL);
720
721 static void
722 if_attachdomain1(struct ifnet *ifp)
723 {
724 struct domain *dp;
725 int s;
726
727 s = splnet();
728
729 /*
730 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
731 * cannot lock ifp->if_afdata initialization, entirely.
732 */
733 if (IF_AFDATA_TRYLOCK(ifp) == 0) {
734 splx(s);
735 return;
736 }
737 if (ifp->if_afdata_initialized >= domain_init_status) {
738 IF_AFDATA_UNLOCK(ifp);
739 splx(s);
740 printf("if_attachdomain called more than once on %s\n",
741 ifp->if_xname);
742 return;
743 }
744 ifp->if_afdata_initialized = domain_init_status;
745 IF_AFDATA_UNLOCK(ifp);
746
747 /* address family dependent data region */
748 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
749 for (dp = domains; dp; dp = dp->dom_next) {
750 if (dp->dom_ifattach)
751 ifp->if_afdata[dp->dom_family] =
752 (*dp->dom_ifattach)(ifp);
753 }
754
755 splx(s);
756 }
757
758 /*
759 * Remove any unicast or broadcast network addresses from an interface.
760 */
761 void
762 if_purgeaddrs(struct ifnet *ifp)
763 {
764 struct ifaddr *ifa, *next;
765
766 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
767 if (ifa->ifa_addr->sa_family == AF_LINK)
768 continue;
769 #ifdef INET
770 /* XXX: Ugly!! ad hoc just for INET */
771 if (ifa->ifa_addr->sa_family == AF_INET) {
772 struct ifaliasreq ifr;
773
774 bzero(&ifr, sizeof(ifr));
775 ifr.ifra_addr = *ifa->ifa_addr;
776 if (ifa->ifa_dstaddr)
777 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
778 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
779 NULL) == 0)
780 continue;
781 }
782 #endif /* INET */
783 #ifdef INET6
784 if (ifa->ifa_addr->sa_family == AF_INET6) {
785 in6_purgeaddr(ifa);
786 /* ifp_addrhead is already updated */
787 continue;
788 }
789 #endif /* INET6 */
790 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
791 ifa_free(ifa);
792 }
793 }
794
795 /*
796 * Remove any multicast network addresses from an interface when an ifnet
797 * is going away.
798 */
799 static void
800 if_purgemaddrs(struct ifnet *ifp)
801 {
802 struct ifmultiaddr *ifma;
803 struct ifmultiaddr *next;
804
805 IF_ADDR_LOCK(ifp);
806 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
807 if_delmulti_locked(ifp, ifma, 1);
808 IF_ADDR_UNLOCK(ifp);
809 }
810
811 /*
812 * Detach an interface, removing it from the list of "active" interfaces.
813 * If vmove flag is set on entry to if_detach_internal(), perform only a
814 * limited subset of cleanup tasks, given that we are moving an ifnet from
815 * one vnet to another, where it must be fully operational.
816 *
817 * XXXRW: There are some significant questions about event ordering, and
818 * how to prevent things from starting to use the interface during detach.
819 */
820 void
821 if_detach(struct ifnet *ifp)
822 {
823
824 if_detach_internal(ifp, 0);
825 }
826
827 static void
828 if_detach_internal(struct ifnet *ifp, int vmove)
829 {
830 struct ifaddr *ifa;
831 struct radix_node_head *rnh;
832 int i, j;
833 struct domain *dp;
834 struct ifnet *iter;
835 int found = 0;
836
837 IFNET_WLOCK();
838 TAILQ_FOREACH(iter, &V_ifnet, if_link)
839 if (iter == ifp) {
840 TAILQ_REMOVE(&V_ifnet, ifp, if_link);
841 found = 1;
842 break;
843 }
844 #ifdef VIMAGE
845 if (found)
846 curvnet->vnet_ifcnt--;
847 #endif
848 IFNET_WUNLOCK();
849 if (!found) {
850 if (vmove)
851 panic("%s: ifp=%p not on the ifnet tailq %p",
852 __func__, ifp, &V_ifnet);
853 else
854 return; /* XXX this should panic as well? */
855 }
856
857 /*
858 * Remove/wait for pending events.
859 */
860 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
861
862 /*
863 * Remove routes and flush queues.
864 */
865 if_down(ifp);
866 #ifdef ALTQ
867 if (ALTQ_IS_ENABLED(&ifp->if_snd))
868 altq_disable(&ifp->if_snd);
869 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
870 altq_detach(&ifp->if_snd);
871 #endif
872
873 if_purgeaddrs(ifp);
874
875 #ifdef INET
876 in_ifdetach(ifp);
877 #endif
878
879 #ifdef INET6
880 /*
881 * Remove all IPv6 kernel structs related to ifp. This should be done
882 * before removing routing entries below, since IPv6 interface direct
883 * routes are expected to be removed by the IPv6-specific kernel API.
884 * Otherwise, the kernel will detect some inconsistency and bark it.
885 */
886 in6_ifdetach(ifp);
887 #endif
888 if_purgemaddrs(ifp);
889
890 if (!vmove) {
891 /*
892 * Prevent further calls into the device driver via ifnet.
893 */
894 if_dead(ifp);
895
896 /*
897 * Remove link ifaddr pointer and maybe decrement if_index.
898 * Clean up all addresses.
899 */
900 ifp->if_addr = NULL;
901
902 /* We can now free link ifaddr. */
903 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
904 ifa = TAILQ_FIRST(&ifp->if_addrhead);
905 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
906 ifa_free(ifa);
907 }
908 }
909
910 /*
911 * Delete all remaining routes using this interface
912 * Unfortuneatly the only way to do this is to slog through
913 * the entire routing table looking for routes which point
914 * to this interface...oh well...
915 */
916 for (i = 1; i <= AF_MAX; i++) {
917 for (j = 0; j < rt_numfibs; j++) {
918 rnh = rt_tables_get_rnh(j, i);
919 if (rnh == NULL)
920 continue;
921 RADIX_NODE_HEAD_LOCK(rnh);
922 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
923 RADIX_NODE_HEAD_UNLOCK(rnh);
924 }
925 }
926
927 /* Announce that the interface is gone. */
928 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
929 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
930 if (IS_DEFAULT_VNET(curvnet))
931 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
932 if_delgroups(ifp);
933
934 /*
935 * We cannot hold the lock over dom_ifdetach calls as they might
936 * sleep, for example trying to drain a callout, thus open up the
937 * theoretical race with re-attaching.
938 */
939 IF_AFDATA_LOCK(ifp);
940 i = ifp->if_afdata_initialized;
941 ifp->if_afdata_initialized = 0;
942 IF_AFDATA_UNLOCK(ifp);
943 for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
944 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
945 (*dp->dom_ifdetach)(ifp,
946 ifp->if_afdata[dp->dom_family]);
947 }
948 }
949
950 #ifdef VIMAGE
951 /*
952 * if_vmove() performs a limited version of if_detach() in current
953 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
954 * An attempt is made to shrink if_index in current vnet, find an
955 * unused if_index in target vnet and calls if_grow() if necessary,
956 * and finally find an unused if_xname for the target vnet.
957 */
958 void
959 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
960 {
961 u_short idx;
962
963 /*
964 * Detach from current vnet, but preserve LLADDR info, do not
965 * mark as dead etc. so that the ifnet can be reattached later.
966 */
967 if_detach_internal(ifp, 1);
968
969 /*
970 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
971 * the if_index for that vnet if possible.
972 *
973 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
974 * or we'd lock on one vnet and unlock on another.
975 */
976 IFNET_WLOCK();
977 ifindex_free_locked(ifp->if_index);
978 IFNET_WUNLOCK();
979
980 /*
981 * Perform interface-specific reassignment tasks, if provided by
982 * the driver.
983 */
984 if (ifp->if_reassign != NULL)
985 ifp->if_reassign(ifp, new_vnet, NULL);
986
987 /*
988 * Switch to the context of the target vnet.
989 */
990 CURVNET_SET_QUIET(new_vnet);
991
992 IFNET_WLOCK();
993 if (ifindex_alloc_locked(&idx) != 0) {
994 IFNET_WUNLOCK();
995 panic("if_index overflow");
996 }
997 ifp->if_index = idx;
998 ifnet_setbyindex_locked(ifp->if_index, ifp);
999 IFNET_WUNLOCK();
1000
1001 if_attach_internal(ifp, 1);
1002
1003 CURVNET_RESTORE();
1004 }
1005
1006 /*
1007 * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1008 */
1009 static int
1010 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1011 {
1012 struct prison *pr;
1013 struct ifnet *difp;
1014
1015 /* Try to find the prison within our visibility. */
1016 sx_slock(&allprison_lock);
1017 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1018 sx_sunlock(&allprison_lock);
1019 if (pr == NULL)
1020 return (ENXIO);
1021 prison_hold_locked(pr);
1022 mtx_unlock(&pr->pr_mtx);
1023
1024 /* Do not try to move the iface from and to the same prison. */
1025 if (pr->pr_vnet == ifp->if_vnet) {
1026 prison_free(pr);
1027 return (EEXIST);
1028 }
1029
1030 /* Make sure the named iface does not exists in the dst. prison/vnet. */
1031 /* XXX Lock interfaces to avoid races. */
1032 CURVNET_SET_QUIET(pr->pr_vnet);
1033 difp = ifunit(ifname);
1034 CURVNET_RESTORE();
1035 if (difp != NULL) {
1036 prison_free(pr);
1037 return (EEXIST);
1038 }
1039
1040 /* Move the interface into the child jail/vnet. */
1041 if_vmove(ifp, pr->pr_vnet);
1042
1043 /* Report the new if_xname back to the userland. */
1044 sprintf(ifname, "%s", ifp->if_xname);
1045
1046 prison_free(pr);
1047 return (0);
1048 }
1049
1050 static int
1051 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1052 {
1053 struct prison *pr;
1054 struct vnet *vnet_dst;
1055 struct ifnet *ifp;
1056
1057 /* Try to find the prison within our visibility. */
1058 sx_slock(&allprison_lock);
1059 pr = prison_find_child(td->td_ucred->cr_prison, jid);
1060 sx_sunlock(&allprison_lock);
1061 if (pr == NULL)
1062 return (ENXIO);
1063 prison_hold_locked(pr);
1064 mtx_unlock(&pr->pr_mtx);
1065
1066 /* Make sure the named iface exists in the source prison/vnet. */
1067 CURVNET_SET(pr->pr_vnet);
1068 ifp = ifunit(ifname); /* XXX Lock to avoid races. */
1069 if (ifp == NULL) {
1070 CURVNET_RESTORE();
1071 prison_free(pr);
1072 return (ENXIO);
1073 }
1074
1075 /* Do not try to move the iface from and to the same prison. */
1076 vnet_dst = TD_TO_VNET(td);
1077 if (vnet_dst == ifp->if_vnet) {
1078 CURVNET_RESTORE();
1079 prison_free(pr);
1080 return (EEXIST);
1081 }
1082
1083 /* Get interface back from child jail/vnet. */
1084 if_vmove(ifp, vnet_dst);
1085 CURVNET_RESTORE();
1086
1087 /* Report the new if_xname back to the userland. */
1088 sprintf(ifname, "%s", ifp->if_xname);
1089
1090 prison_free(pr);
1091 return (0);
1092 }
1093 #endif /* VIMAGE */
1094
1095 /*
1096 * Add a group to an interface
1097 */
1098 int
1099 if_addgroup(struct ifnet *ifp, const char *groupname)
1100 {
1101 struct ifg_list *ifgl;
1102 struct ifg_group *ifg = NULL;
1103 struct ifg_member *ifgm;
1104
1105 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' &&
1106 groupname[strlen(groupname) - 1] <= '9')
1107 return (EINVAL);
1108
1109 IFNET_WLOCK();
1110 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1111 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1112 IFNET_WUNLOCK();
1113 return (EEXIST);
1114 }
1115
1116 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
1117 M_NOWAIT)) == NULL) {
1118 IFNET_WUNLOCK();
1119 return (ENOMEM);
1120 }
1121
1122 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
1123 M_TEMP, M_NOWAIT)) == NULL) {
1124 free(ifgl, M_TEMP);
1125 IFNET_WUNLOCK();
1126 return (ENOMEM);
1127 }
1128
1129 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1130 if (!strcmp(ifg->ifg_group, groupname))
1131 break;
1132
1133 if (ifg == NULL) {
1134 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
1135 M_TEMP, M_NOWAIT)) == NULL) {
1136 free(ifgl, M_TEMP);
1137 free(ifgm, M_TEMP);
1138 IFNET_WUNLOCK();
1139 return (ENOMEM);
1140 }
1141 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1142 ifg->ifg_refcnt = 0;
1143 TAILQ_INIT(&ifg->ifg_members);
1144 EVENTHANDLER_INVOKE(group_attach_event, ifg);
1145 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1146 }
1147
1148 ifg->ifg_refcnt++;
1149 ifgl->ifgl_group = ifg;
1150 ifgm->ifgm_ifp = ifp;
1151
1152 IF_ADDR_LOCK(ifp);
1153 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1154 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1155 IF_ADDR_UNLOCK(ifp);
1156
1157 IFNET_WUNLOCK();
1158
1159 EVENTHANDLER_INVOKE(group_change_event, groupname);
1160
1161 return (0);
1162 }
1163
1164 /*
1165 * Remove a group from an interface
1166 */
1167 int
1168 if_delgroup(struct ifnet *ifp, const char *groupname)
1169 {
1170 struct ifg_list *ifgl;
1171 struct ifg_member *ifgm;
1172
1173 IFNET_WLOCK();
1174 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1175 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
1176 break;
1177 if (ifgl == NULL) {
1178 IFNET_WUNLOCK();
1179 return (ENOENT);
1180 }
1181
1182 IF_ADDR_LOCK(ifp);
1183 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1184 IF_ADDR_UNLOCK(ifp);
1185
1186 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1187 if (ifgm->ifgm_ifp == ifp)
1188 break;
1189
1190 if (ifgm != NULL) {
1191 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
1192 free(ifgm, M_TEMP);
1193 }
1194
1195 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1196 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1197 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1198 free(ifgl->ifgl_group, M_TEMP);
1199 }
1200 IFNET_WUNLOCK();
1201
1202 free(ifgl, M_TEMP);
1203
1204 EVENTHANDLER_INVOKE(group_change_event, groupname);
1205
1206 return (0);
1207 }
1208
1209 /*
1210 * Remove an interface from all groups
1211 */
1212 static void
1213 if_delgroups(struct ifnet *ifp)
1214 {
1215 struct ifg_list *ifgl;
1216 struct ifg_member *ifgm;
1217 char groupname[IFNAMSIZ];
1218
1219 IFNET_WLOCK();
1220 while (!TAILQ_EMPTY(&ifp->if_groups)) {
1221 ifgl = TAILQ_FIRST(&ifp->if_groups);
1222
1223 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1224
1225 IF_ADDR_LOCK(ifp);
1226 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
1227 IF_ADDR_UNLOCK(ifp);
1228
1229 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1230 if (ifgm->ifgm_ifp == ifp)
1231 break;
1232
1233 if (ifgm != NULL) {
1234 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1235 ifgm_next);
1236 free(ifgm, M_TEMP);
1237 }
1238
1239 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1240 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next);
1241 EVENTHANDLER_INVOKE(group_detach_event,
1242 ifgl->ifgl_group);
1243 free(ifgl->ifgl_group, M_TEMP);
1244 }
1245 IFNET_WUNLOCK();
1246
1247 free(ifgl, M_TEMP);
1248
1249 EVENTHANDLER_INVOKE(group_change_event, groupname);
1250
1251 IFNET_WLOCK();
1252 }
1253 IFNET_WUNLOCK();
1254 }
1255
1256 /*
1257 * Stores all groups from an interface in memory pointed
1258 * to by data
1259 */
1260 static int
1261 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp)
1262 {
1263 int len, error;
1264 struct ifg_list *ifgl;
1265 struct ifg_req ifgrq, *ifgp;
1266 struct ifgroupreq *ifgr = data;
1267
1268 if (ifgr->ifgr_len == 0) {
1269 IF_ADDR_LOCK(ifp);
1270 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1271 ifgr->ifgr_len += sizeof(struct ifg_req);
1272 IF_ADDR_UNLOCK(ifp);
1273 return (0);
1274 }
1275
1276 len = ifgr->ifgr_len;
1277 ifgp = ifgr->ifgr_groups;
1278 /* XXX: wire */
1279 IF_ADDR_LOCK(ifp);
1280 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1281 if (len < sizeof(ifgrq)) {
1282 IF_ADDR_UNLOCK(ifp);
1283 return (EINVAL);
1284 }
1285 bzero(&ifgrq, sizeof ifgrq);
1286 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1287 sizeof(ifgrq.ifgrq_group));
1288 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1289 IF_ADDR_UNLOCK(ifp);
1290 return (error);
1291 }
1292 len -= sizeof(ifgrq);
1293 ifgp++;
1294 }
1295 IF_ADDR_UNLOCK(ifp);
1296
1297 return (0);
1298 }
1299
1300 /*
1301 * Stores all members of a group in memory pointed to by data
1302 */
1303 static int
1304 if_getgroupmembers(struct ifgroupreq *data)
1305 {
1306 struct ifgroupreq *ifgr = data;
1307 struct ifg_group *ifg;
1308 struct ifg_member *ifgm;
1309 struct ifg_req ifgrq, *ifgp;
1310 int len, error;
1311
1312 IFNET_RLOCK();
1313 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1314 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1315 break;
1316 if (ifg == NULL) {
1317 IFNET_RUNLOCK();
1318 return (ENOENT);
1319 }
1320
1321 if (ifgr->ifgr_len == 0) {
1322 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1323 ifgr->ifgr_len += sizeof(ifgrq);
1324 IFNET_RUNLOCK();
1325 return (0);
1326 }
1327
1328 len = ifgr->ifgr_len;
1329 ifgp = ifgr->ifgr_groups;
1330 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1331 if (len < sizeof(ifgrq)) {
1332 IFNET_RUNLOCK();
1333 return (EINVAL);
1334 }
1335 bzero(&ifgrq, sizeof ifgrq);
1336 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1337 sizeof(ifgrq.ifgrq_member));
1338 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1339 IFNET_RUNLOCK();
1340 return (error);
1341 }
1342 len -= sizeof(ifgrq);
1343 ifgp++;
1344 }
1345 IFNET_RUNLOCK();
1346
1347 return (0);
1348 }
1349
1350 /*
1351 * Delete Routes for a Network Interface
1352 *
1353 * Called for each routing entry via the rnh->rnh_walktree() call above
1354 * to delete all route entries referencing a detaching network interface.
1355 *
1356 * Arguments:
1357 * rn pointer to node in the routing table
1358 * arg argument passed to rnh->rnh_walktree() - detaching interface
1359 *
1360 * Returns:
1361 * 0 successful
1362 * errno failed - reason indicated
1363 *
1364 */
1365 static int
1366 if_rtdel(struct radix_node *rn, void *arg)
1367 {
1368 struct rtentry *rt = (struct rtentry *)rn;
1369 struct ifnet *ifp = arg;
1370 int err;
1371
1372 if (rt->rt_ifp == ifp) {
1373
1374 /*
1375 * Protect (sorta) against walktree recursion problems
1376 * with cloned routes
1377 */
1378 if ((rt->rt_flags & RTF_UP) == 0)
1379 return (0);
1380
1381 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1382 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED,
1383 (struct rtentry **) NULL, rt->rt_fibnum);
1384 if (err) {
1385 log(LOG_WARNING, "if_rtdel: error %d\n", err);
1386 }
1387 }
1388
1389 return (0);
1390 }
1391
1392 /*
1393 * Wrapper functions for struct ifnet address list locking macros. These are
1394 * used by kernel modules to avoid encoding programming interface or binary
1395 * interface assumptions that may be violated when kernel-internal locking
1396 * approaches change.
1397 */
1398 void
1399 if_addr_rlock(struct ifnet *ifp)
1400 {
1401
1402 IF_ADDR_LOCK(ifp);
1403 }
1404
1405 void
1406 if_addr_runlock(struct ifnet *ifp)
1407 {
1408
1409 IF_ADDR_UNLOCK(ifp);
1410 }
1411
1412 void
1413 if_maddr_rlock(struct ifnet *ifp)
1414 {
1415
1416 IF_ADDR_LOCK(ifp);
1417 }
1418
1419 void
1420 if_maddr_runlock(struct ifnet *ifp)
1421 {
1422
1423 IF_ADDR_UNLOCK(ifp);
1424 }
1425
1426 /*
1427 * Reference count functions for ifaddrs.
1428 */
1429 void
1430 ifa_init(struct ifaddr *ifa)
1431 {
1432
1433 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF);
1434 refcount_init(&ifa->ifa_refcnt, 1);
1435 }
1436
1437 void
1438 ifa_ref(struct ifaddr *ifa)
1439 {
1440
1441 refcount_acquire(&ifa->ifa_refcnt);
1442 }
1443
1444 void
1445 ifa_free(struct ifaddr *ifa)
1446 {
1447
1448 if (refcount_release(&ifa->ifa_refcnt)) {
1449 mtx_destroy(&ifa->ifa_mtx);
1450 free(ifa, M_IFADDR);
1451 }
1452 }
1453
1454 int
1455 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1456 {
1457 int error = 0;
1458 struct rtentry *rt = NULL;
1459 struct rt_addrinfo info;
1460 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1461
1462 bzero(&info, sizeof(info));
1463 info.rti_ifp = V_loif;
1464 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1465 info.rti_info[RTAX_DST] = ia;
1466 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1467 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0);
1468
1469 if (error == 0 && rt != NULL) {
1470 RT_LOCK(rt);
1471 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1472 ifa->ifa_ifp->if_type;
1473 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1474 ifa->ifa_ifp->if_index;
1475 RT_REMREF(rt);
1476 RT_UNLOCK(rt);
1477 } else if (error != 0)
1478 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n");
1479
1480 return (error);
1481 }
1482
1483 int
1484 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1485 {
1486 int error = 0;
1487 struct rt_addrinfo info;
1488 struct sockaddr_dl null_sdl;
1489
1490 bzero(&null_sdl, sizeof(null_sdl));
1491 null_sdl.sdl_len = sizeof(null_sdl);
1492 null_sdl.sdl_family = AF_LINK;
1493 null_sdl.sdl_type = ifa->ifa_ifp->if_type;
1494 null_sdl.sdl_index = ifa->ifa_ifp->if_index;
1495 bzero(&info, sizeof(info));
1496 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC;
1497 info.rti_info[RTAX_DST] = ia;
1498 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1499 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0);
1500
1501 if (error != 0)
1502 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n");
1503
1504 return (error);
1505 }
1506
1507 /*
1508 * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1509 * structs used to represent other address families, it is necessary
1510 * to perform a different comparison.
1511 */
1512
1513 #define sa_equal(a1, a2) \
1514 (bcmp((a1), (a2), ((a1))->sa_len) == 0)
1515
1516 #define sa_dl_equal(a1, a2) \
1517 ((((struct sockaddr_dl *)(a1))->sdl_len == \
1518 ((struct sockaddr_dl *)(a2))->sdl_len) && \
1519 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
1520 LLADDR((struct sockaddr_dl *)(a2)), \
1521 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1522
1523 /*
1524 * Locate an interface based on a complete address.
1525 */
1526 /*ARGSUSED*/
1527 static struct ifaddr *
1528 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref)
1529 {
1530 struct ifnet *ifp;
1531 struct ifaddr *ifa;
1532
1533 IFNET_RLOCK_NOSLEEP();
1534 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1535 IF_ADDR_LOCK(ifp);
1536 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1537 if (ifa->ifa_addr->sa_family != addr->sa_family)
1538 continue;
1539 if (sa_equal(addr, ifa->ifa_addr)) {
1540 if (getref)
1541 ifa_ref(ifa);
1542 IF_ADDR_UNLOCK(ifp);
1543 goto done;
1544 }
1545 /* IP6 doesn't have broadcast */
1546 if ((ifp->if_flags & IFF_BROADCAST) &&
1547 ifa->ifa_broadaddr &&
1548 ifa->ifa_broadaddr->sa_len != 0 &&
1549 sa_equal(ifa->ifa_broadaddr, addr)) {
1550 if (getref)
1551 ifa_ref(ifa);
1552 IF_ADDR_UNLOCK(ifp);
1553 goto done;
1554 }
1555 }
1556 IF_ADDR_UNLOCK(ifp);
1557 }
1558 ifa = NULL;
1559 done:
1560 IFNET_RUNLOCK_NOSLEEP();
1561 return (ifa);
1562 }
1563
1564 struct ifaddr *
1565 ifa_ifwithaddr(struct sockaddr *addr)
1566 {
1567
1568 return (ifa_ifwithaddr_internal(addr, 1));
1569 }
1570
1571 int
1572 ifa_ifwithaddr_check(struct sockaddr *addr)
1573 {
1574
1575 return (ifa_ifwithaddr_internal(addr, 0) != NULL);
1576 }
1577
1578 /*
1579 * Locate an interface based on the broadcast address.
1580 */
1581 /* ARGSUSED */
1582 struct ifaddr *
1583 ifa_ifwithbroadaddr(struct sockaddr *addr)
1584 {
1585 struct ifnet *ifp;
1586 struct ifaddr *ifa;
1587
1588 IFNET_RLOCK_NOSLEEP();
1589 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1590 IF_ADDR_LOCK(ifp);
1591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1592 if (ifa->ifa_addr->sa_family != addr->sa_family)
1593 continue;
1594 if ((ifp->if_flags & IFF_BROADCAST) &&
1595 ifa->ifa_broadaddr &&
1596 ifa->ifa_broadaddr->sa_len != 0 &&
1597 sa_equal(ifa->ifa_broadaddr, addr)) {
1598 ifa_ref(ifa);
1599 IF_ADDR_UNLOCK(ifp);
1600 goto done;
1601 }
1602 }
1603 IF_ADDR_UNLOCK(ifp);
1604 }
1605 ifa = NULL;
1606 done:
1607 IFNET_RUNLOCK_NOSLEEP();
1608 return (ifa);
1609 }
1610
1611 /*
1612 * Locate the point to point interface with a given destination address.
1613 */
1614 /*ARGSUSED*/
1615 struct ifaddr *
1616 ifa_ifwithdstaddr(struct sockaddr *addr)
1617 {
1618 struct ifnet *ifp;
1619 struct ifaddr *ifa;
1620
1621 IFNET_RLOCK_NOSLEEP();
1622 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1623 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1624 continue;
1625 IF_ADDR_LOCK(ifp);
1626 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1627 if (ifa->ifa_addr->sa_family != addr->sa_family)
1628 continue;
1629 if (ifa->ifa_dstaddr != NULL &&
1630 sa_equal(addr, ifa->ifa_dstaddr)) {
1631 ifa_ref(ifa);
1632 IF_ADDR_UNLOCK(ifp);
1633 goto done;
1634 }
1635 }
1636 IF_ADDR_UNLOCK(ifp);
1637 }
1638 ifa = NULL;
1639 done:
1640 IFNET_RUNLOCK_NOSLEEP();
1641 return (ifa);
1642 }
1643
1644 /*
1645 * Find an interface on a specific network. If many, choice
1646 * is most specific found.
1647 */
1648 struct ifaddr *
1649 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp)
1650 {
1651 struct ifnet *ifp;
1652 struct ifaddr *ifa;
1653 struct ifaddr *ifa_maybe = NULL;
1654 u_int af = addr->sa_family;
1655 char *addr_data = addr->sa_data, *cplim;
1656
1657 /*
1658 * AF_LINK addresses can be looked up directly by their index number,
1659 * so do that if we can.
1660 */
1661 if (af == AF_LINK) {
1662 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1663 if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
1664 return (ifaddr_byindex(sdl->sdl_index));
1665 }
1666
1667 /*
1668 * Scan though each interface, looking for ones that have addresses
1669 * in this address family. Maintain a reference on ifa_maybe once
1670 * we find one, as we release the IF_ADDR_LOCK() that kept it stable
1671 * when we move onto the next interface.
1672 */
1673 IFNET_RLOCK_NOSLEEP();
1674 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1675 IF_ADDR_LOCK(ifp);
1676 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1677 char *cp, *cp2, *cp3;
1678
1679 if (ifa->ifa_addr->sa_family != af)
1680 next: continue;
1681 if (af == AF_INET &&
1682 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1683 /*
1684 * This is a bit broken as it doesn't
1685 * take into account that the remote end may
1686 * be a single node in the network we are
1687 * looking for.
1688 * The trouble is that we don't know the
1689 * netmask for the remote end.
1690 */
1691 if (ifa->ifa_dstaddr != NULL &&
1692 sa_equal(addr, ifa->ifa_dstaddr)) {
1693 ifa_ref(ifa);
1694 IF_ADDR_UNLOCK(ifp);
1695 goto done;
1696 }
1697 } else {
1698 /*
1699 * if we have a special address handler,
1700 * then use it instead of the generic one.
1701 */
1702 if (ifa->ifa_claim_addr) {
1703 if ((*ifa->ifa_claim_addr)(ifa, addr)) {
1704 ifa_ref(ifa);
1705 IF_ADDR_UNLOCK(ifp);
1706 goto done;
1707 }
1708 continue;
1709 }
1710
1711 /*
1712 * Scan all the bits in the ifa's address.
1713 * If a bit dissagrees with what we are
1714 * looking for, mask it with the netmask
1715 * to see if it really matters.
1716 * (A byte at a time)
1717 */
1718 if (ifa->ifa_netmask == 0)
1719 continue;
1720 cp = addr_data;
1721 cp2 = ifa->ifa_addr->sa_data;
1722 cp3 = ifa->ifa_netmask->sa_data;
1723 cplim = ifa->ifa_netmask->sa_len
1724 + (char *)ifa->ifa_netmask;
1725 while (cp3 < cplim)
1726 if ((*cp++ ^ *cp2++) & *cp3++)
1727 goto next; /* next address! */
1728 /*
1729 * If the netmask of what we just found
1730 * is more specific than what we had before
1731 * (if we had one) then remember the new one
1732 * before continuing to search
1733 * for an even better one.
1734 */
1735 if (ifa_maybe == NULL ||
1736 rn_refines((caddr_t)ifa->ifa_netmask,
1737 (caddr_t)ifa_maybe->ifa_netmask)) {
1738 if (ifa_maybe != NULL)
1739 ifa_free(ifa_maybe);
1740 ifa_maybe = ifa;
1741 ifa_ref(ifa_maybe);
1742 }
1743 }
1744 }
1745 IF_ADDR_UNLOCK(ifp);
1746 }
1747 ifa = ifa_maybe;
1748 ifa_maybe = NULL;
1749 done:
1750 IFNET_RUNLOCK_NOSLEEP();
1751 if (ifa_maybe != NULL)
1752 ifa_free(ifa_maybe);
1753 return (ifa);
1754 }
1755
1756 /*
1757 * Find an interface address specific to an interface best matching
1758 * a given address.
1759 */
1760 struct ifaddr *
1761 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1762 {
1763 struct ifaddr *ifa;
1764 char *cp, *cp2, *cp3;
1765 char *cplim;
1766 struct ifaddr *ifa_maybe = NULL;
1767 u_int af = addr->sa_family;
1768
1769 if (af >= AF_MAX)
1770 return (NULL);
1771 IF_ADDR_LOCK(ifp);
1772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1773 if (ifa->ifa_addr->sa_family != af)
1774 continue;
1775 if (ifa_maybe == NULL)
1776 ifa_maybe = ifa;
1777 if (ifa->ifa_netmask == 0) {
1778 if (sa_equal(addr, ifa->ifa_addr) ||
1779 (ifa->ifa_dstaddr &&
1780 sa_equal(addr, ifa->ifa_dstaddr)))
1781 goto done;
1782 continue;
1783 }
1784 if (ifp->if_flags & IFF_POINTOPOINT) {
1785 if (sa_equal(addr, ifa->ifa_dstaddr))
1786 goto done;
1787 } else {
1788 cp = addr->sa_data;
1789 cp2 = ifa->ifa_addr->sa_data;
1790 cp3 = ifa->ifa_netmask->sa_data;
1791 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1792 for (; cp3 < cplim; cp3++)
1793 if ((*cp++ ^ *cp2++) & *cp3)
1794 break;
1795 if (cp3 == cplim)
1796 goto done;
1797 }
1798 }
1799 ifa = ifa_maybe;
1800 done:
1801 if (ifa != NULL)
1802 ifa_ref(ifa);
1803 IF_ADDR_UNLOCK(ifp);
1804 return (ifa);
1805 }
1806
1807 #include <net/if_llatbl.h>
1808
1809 /*
1810 * Default action when installing a route with a Link Level gateway.
1811 * Lookup an appropriate real ifa to point to.
1812 * This should be moved to /sys/net/link.c eventually.
1813 */
1814 static void
1815 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
1816 {
1817 struct ifaddr *ifa, *oifa;
1818 struct sockaddr *dst;
1819 struct ifnet *ifp;
1820
1821 RT_LOCK_ASSERT(rt);
1822
1823 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
1824 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
1825 return;
1826 ifa = ifaof_ifpforaddr(dst, ifp);
1827 if (ifa) {
1828 oifa = rt->rt_ifa;
1829 rt->rt_ifa = ifa;
1830 ifa_free(oifa);
1831 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
1832 ifa->ifa_rtrequest(cmd, rt, info);
1833 }
1834 }
1835
1836 /*
1837 * Mark an interface down and notify protocols of
1838 * the transition.
1839 * NOTE: must be called at splnet or eqivalent.
1840 */
1841 static void
1842 if_unroute(struct ifnet *ifp, int flag, int fam)
1843 {
1844 struct ifaddr *ifa;
1845
1846 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
1847
1848 ifp->if_flags &= ~flag;
1849 getmicrotime(&ifp->if_lastchange);
1850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1852 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1853 ifp->if_qflush(ifp);
1854
1855 if (ifp->if_carp)
1856 (*carp_linkstate_p)(ifp);
1857 rt_ifmsg(ifp);
1858 }
1859
1860 /*
1861 * Mark an interface up and notify protocols of
1862 * the transition.
1863 * NOTE: must be called at splnet or eqivalent.
1864 */
1865 static void
1866 if_route(struct ifnet *ifp, int flag, int fam)
1867 {
1868 struct ifaddr *ifa;
1869
1870 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
1871
1872 ifp->if_flags |= flag;
1873 getmicrotime(&ifp->if_lastchange);
1874 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1875 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1876 pfctlinput(PRC_IFUP, ifa->ifa_addr);
1877 if (ifp->if_carp)
1878 (*carp_linkstate_p)(ifp);
1879 rt_ifmsg(ifp);
1880 #ifdef INET6
1881 in6_if_up(ifp);
1882 #endif
1883 }
1884
1885 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */
1886 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
1887 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
1888 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
1889 int (*vlan_tag_p)(struct ifnet *, uint16_t *);
1890 int (*vlan_setcookie_p)(struct ifnet *, void *);
1891 void *(*vlan_cookie_p)(struct ifnet *);
1892
1893 /*
1894 * Handle a change in the interface link state. To avoid LORs
1895 * between driver lock and upper layer locks, as well as possible
1896 * recursions, we post event to taskqueue, and all job
1897 * is done in static do_link_state_change().
1898 */
1899 void
1900 if_link_state_change(struct ifnet *ifp, int link_state)
1901 {
1902 /* Return if state hasn't changed. */
1903 if (ifp->if_link_state == link_state)
1904 return;
1905
1906 ifp->if_link_state = link_state;
1907
1908 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
1909 }
1910
1911 static void
1912 do_link_state_change(void *arg, int pending)
1913 {
1914 struct ifnet *ifp = (struct ifnet *)arg;
1915 int link_state = ifp->if_link_state;
1916 CURVNET_SET(ifp->if_vnet);
1917
1918 /* Notify that the link state has changed. */
1919 rt_ifmsg(ifp);
1920 if (ifp->if_vlantrunk != NULL)
1921 (*vlan_link_state_p)(ifp);
1922
1923 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
1924 IFP2AC(ifp)->ac_netgraph != NULL)
1925 (*ng_ether_link_state_p)(ifp, link_state);
1926 if (ifp->if_carp)
1927 (*carp_linkstate_p)(ifp);
1928 if (ifp->if_bridge) {
1929 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!"));
1930 (*bstp_linkstate_p)(ifp, link_state);
1931 }
1932 if (ifp->if_lagg) {
1933 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!"));
1934 (*lagg_linkstate_p)(ifp, link_state);
1935 }
1936
1937 if (IS_DEFAULT_VNET(curvnet))
1938 devctl_notify("IFNET", ifp->if_xname,
1939 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
1940 NULL);
1941 if (pending > 1)
1942 if_printf(ifp, "%d link states coalesced\n", pending);
1943 if (log_link_state_change)
1944 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
1945 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
1946 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state);
1947 CURVNET_RESTORE();
1948 }
1949
1950 /*
1951 * Mark an interface down and notify protocols of
1952 * the transition.
1953 * NOTE: must be called at splnet or eqivalent.
1954 */
1955 void
1956 if_down(struct ifnet *ifp)
1957 {
1958
1959 if_unroute(ifp, IFF_UP, AF_UNSPEC);
1960 }
1961
1962 /*
1963 * Mark an interface up and notify protocols of
1964 * the transition.
1965 * NOTE: must be called at splnet or eqivalent.
1966 */
1967 void
1968 if_up(struct ifnet *ifp)
1969 {
1970
1971 if_route(ifp, IFF_UP, AF_UNSPEC);
1972 }
1973
1974 /*
1975 * Flush an interface queue.
1976 */
1977 void
1978 if_qflush(struct ifnet *ifp)
1979 {
1980 struct mbuf *m, *n;
1981 struct ifaltq *ifq;
1982
1983 ifq = &ifp->if_snd;
1984 IFQ_LOCK(ifq);
1985 #ifdef ALTQ
1986 if (ALTQ_IS_ENABLED(ifq))
1987 ALTQ_PURGE(ifq);
1988 #endif
1989 n = ifq->ifq_head;
1990 while ((m = n) != 0) {
1991 n = m->m_act;
1992 m_freem(m);
1993 }
1994 ifq->ifq_head = 0;
1995 ifq->ifq_tail = 0;
1996 ifq->ifq_len = 0;
1997 IFQ_UNLOCK(ifq);
1998 }
1999
2000 /*
2001 * Map interface name to interface structure pointer, with or without
2002 * returning a reference.
2003 */
2004 struct ifnet *
2005 ifunit_ref(const char *name)
2006 {
2007 struct ifnet *ifp;
2008
2009 IFNET_RLOCK_NOSLEEP();
2010 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2011 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2012 !(ifp->if_flags & IFF_DYING))
2013 break;
2014 }
2015 if (ifp != NULL)
2016 if_ref(ifp);
2017 IFNET_RUNLOCK_NOSLEEP();
2018 return (ifp);
2019 }
2020
2021 struct ifnet *
2022 ifunit(const char *name)
2023 {
2024 struct ifnet *ifp;
2025
2026 IFNET_RLOCK_NOSLEEP();
2027 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2028 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2029 break;
2030 }
2031 IFNET_RUNLOCK_NOSLEEP();
2032 return (ifp);
2033 }
2034
2035 /*
2036 * Hardware specific interface ioctls.
2037 */
2038 static int
2039 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2040 {
2041 struct ifreq *ifr;
2042 struct ifstat *ifs;
2043 int error = 0;
2044 int new_flags, temp_flags;
2045 size_t namelen, onamelen;
2046 size_t descrlen;
2047 char *descrbuf, *odescrbuf;
2048 char new_name[IFNAMSIZ];
2049 struct ifaddr *ifa;
2050 struct sockaddr_dl *sdl;
2051
2052 ifr = (struct ifreq *)data;
2053 switch (cmd) {
2054 case SIOCGIFINDEX:
2055 ifr->ifr_index = ifp->if_index;
2056 break;
2057
2058 case SIOCGIFFLAGS:
2059 temp_flags = ifp->if_flags | ifp->if_drv_flags;
2060 ifr->ifr_flags = temp_flags & 0xffff;
2061 ifr->ifr_flagshigh = temp_flags >> 16;
2062 break;
2063
2064 case SIOCGIFCAP:
2065 ifr->ifr_reqcap = ifp->if_capabilities;
2066 ifr->ifr_curcap = ifp->if_capenable;
2067 break;
2068
2069 #ifdef MAC
2070 case SIOCGIFMAC:
2071 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2072 break;
2073 #endif
2074
2075 case SIOCGIFMETRIC:
2076 ifr->ifr_metric = ifp->if_metric;
2077 break;
2078
2079 case SIOCGIFMTU:
2080 ifr->ifr_mtu = ifp->if_mtu;
2081 break;
2082
2083 case SIOCGIFPHYS:
2084 ifr->ifr_phys = ifp->if_physical;
2085 break;
2086
2087 case SIOCGIFDESCR:
2088 error = 0;
2089 sx_slock(&ifdescr_sx);
2090 if (ifp->if_description == NULL)
2091 error = ENOMSG;
2092 else {
2093 /* space for terminating nul */
2094 descrlen = strlen(ifp->if_description) + 1;
2095 if (ifr->ifr_buffer.length < descrlen)
2096 ifr->ifr_buffer.buffer = NULL;
2097 else
2098 error = copyout(ifp->if_description,
2099 ifr->ifr_buffer.buffer, descrlen);
2100 ifr->ifr_buffer.length = descrlen;
2101 }
2102 sx_sunlock(&ifdescr_sx);
2103 break;
2104
2105 case SIOCSIFDESCR:
2106 error = priv_check(td, PRIV_NET_SETIFDESCR);
2107 if (error)
2108 return (error);
2109
2110 /*
2111 * Copy only (length-1) bytes to make sure that
2112 * if_description is always nul terminated. The
2113 * length parameter is supposed to count the
2114 * terminating nul in.
2115 */
2116 if (ifr->ifr_buffer.length > ifdescr_maxlen)
2117 return (ENAMETOOLONG);
2118 else if (ifr->ifr_buffer.length == 0)
2119 descrbuf = NULL;
2120 else {
2121 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR,
2122 M_WAITOK | M_ZERO);
2123 error = copyin(ifr->ifr_buffer.buffer, descrbuf,
2124 ifr->ifr_buffer.length - 1);
2125 if (error) {
2126 free(descrbuf, M_IFDESCR);
2127 break;
2128 }
2129 }
2130
2131 sx_xlock(&ifdescr_sx);
2132 odescrbuf = ifp->if_description;
2133 ifp->if_description = descrbuf;
2134 sx_xunlock(&ifdescr_sx);
2135
2136 getmicrotime(&ifp->if_lastchange);
2137 free(odescrbuf, M_IFDESCR);
2138 break;
2139
2140 case SIOCGIFFIB:
2141 ifr->ifr_fib = ifp->if_fib;
2142 break;
2143
2144 case SIOCSIFFIB:
2145 error = priv_check(td, PRIV_NET_SETIFFIB);
2146 if (error)
2147 return (error);
2148 if (ifr->ifr_fib >= rt_numfibs)
2149 return (EINVAL);
2150
2151 ifp->if_fib = ifr->ifr_fib;
2152 break;
2153
2154 case SIOCSIFFLAGS:
2155 error = priv_check(td, PRIV_NET_SETIFFLAGS);
2156 if (error)
2157 return (error);
2158 /*
2159 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2160 * check, so we don't need special handling here yet.
2161 */
2162 new_flags = (ifr->ifr_flags & 0xffff) |
2163 (ifr->ifr_flagshigh << 16);
2164 if (ifp->if_flags & IFF_SMART) {
2165 /* Smart drivers twiddle their own routes */
2166 } else if (ifp->if_flags & IFF_UP &&
2167 (new_flags & IFF_UP) == 0) {
2168 int s = splimp();
2169 if_down(ifp);
2170 splx(s);
2171 } else if (new_flags & IFF_UP &&
2172 (ifp->if_flags & IFF_UP) == 0) {
2173 int s = splimp();
2174 if_up(ifp);
2175 splx(s);
2176 }
2177 /* See if permanently promiscuous mode bit is about to flip */
2178 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2179 if (new_flags & IFF_PPROMISC)
2180 ifp->if_flags |= IFF_PROMISC;
2181 else if (ifp->if_pcount == 0)
2182 ifp->if_flags &= ~IFF_PROMISC;
2183 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
2184 ifp->if_xname,
2185 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
2186 }
2187 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2188 (new_flags &~ IFF_CANTCHANGE);
2189 if (ifp->if_ioctl) {
2190 (void) (*ifp->if_ioctl)(ifp, cmd, data);
2191 }
2192 getmicrotime(&ifp->if_lastchange);
2193 break;
2194
2195 case SIOCSIFCAP:
2196 error = priv_check(td, PRIV_NET_SETIFCAP);
2197 if (error)
2198 return (error);
2199 if (ifp->if_ioctl == NULL)
2200 return (EOPNOTSUPP);
2201 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2202 return (EINVAL);
2203 error = (*ifp->if_ioctl)(ifp, cmd, data);
2204 if (error == 0)
2205 getmicrotime(&ifp->if_lastchange);
2206 break;
2207
2208 #ifdef MAC
2209 case SIOCSIFMAC:
2210 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2211 break;
2212 #endif
2213
2214 case SIOCSIFNAME:
2215 error = priv_check(td, PRIV_NET_SETIFNAME);
2216 if (error)
2217 return (error);
2218 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
2219 if (error != 0)
2220 return (error);
2221 if (new_name[0] == '\0')
2222 return (EINVAL);
2223 if (ifunit(new_name) != NULL)
2224 return (EEXIST);
2225
2226 /*
2227 * XXX: Locking. Nothing else seems to lock if_flags,
2228 * and there are numerous other races with the
2229 * ifunit() checks not being atomic with namespace
2230 * changes (renames, vmoves, if_attach, etc).
2231 */
2232 ifp->if_flags |= IFF_RENAMING;
2233
2234 /* Announce the departure of the interface. */
2235 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2236 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2237
2238 log(LOG_INFO, "%s: changing name to '%s'\n",
2239 ifp->if_xname, new_name);
2240
2241 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2242 ifa = ifp->if_addr;
2243 IFA_LOCK(ifa);
2244 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2245 namelen = strlen(new_name);
2246 onamelen = sdl->sdl_nlen;
2247 /*
2248 * Move the address if needed. This is safe because we
2249 * allocate space for a name of length IFNAMSIZ when we
2250 * create this in if_attach().
2251 */
2252 if (namelen != onamelen) {
2253 bcopy(sdl->sdl_data + onamelen,
2254 sdl->sdl_data + namelen, sdl->sdl_alen);
2255 }
2256 bcopy(new_name, sdl->sdl_data, namelen);
2257 sdl->sdl_nlen = namelen;
2258 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2259 bzero(sdl->sdl_data, onamelen);
2260 while (namelen != 0)
2261 sdl->sdl_data[--namelen] = 0xff;
2262 IFA_UNLOCK(ifa);
2263
2264 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2265 /* Announce the return of the interface. */
2266 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2267
2268 ifp->if_flags &= ~IFF_RENAMING;
2269 break;
2270
2271 #ifdef VIMAGE
2272 case SIOCSIFVNET:
2273 error = priv_check(td, PRIV_NET_SETIFVNET);
2274 if (error)
2275 return (error);
2276 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2277 break;
2278 #endif
2279
2280 case SIOCSIFMETRIC:
2281 error = priv_check(td, PRIV_NET_SETIFMETRIC);
2282 if (error)
2283 return (error);
2284 ifp->if_metric = ifr->ifr_metric;
2285 getmicrotime(&ifp->if_lastchange);
2286 break;
2287
2288 case SIOCSIFPHYS:
2289 error = priv_check(td, PRIV_NET_SETIFPHYS);
2290 if (error)
2291 return (error);
2292 if (ifp->if_ioctl == NULL)
2293 return (EOPNOTSUPP);
2294 error = (*ifp->if_ioctl)(ifp, cmd, data);
2295 if (error == 0)
2296 getmicrotime(&ifp->if_lastchange);
2297 break;
2298
2299 case SIOCSIFMTU:
2300 {
2301 u_long oldmtu = ifp->if_mtu;
2302
2303 error = priv_check(td, PRIV_NET_SETIFMTU);
2304 if (error)
2305 return (error);
2306 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2307 return (EINVAL);
2308 if (ifp->if_ioctl == NULL)
2309 return (EOPNOTSUPP);
2310 error = (*ifp->if_ioctl)(ifp, cmd, data);
2311 if (error == 0) {
2312 getmicrotime(&ifp->if_lastchange);
2313 rt_ifmsg(ifp);
2314 }
2315 /*
2316 * If the link MTU changed, do network layer specific procedure.
2317 */
2318 if (ifp->if_mtu != oldmtu) {
2319 #ifdef INET6
2320 nd6_setmtu(ifp);
2321 #endif
2322 }
2323 break;
2324 }
2325
2326 case SIOCADDMULTI:
2327 case SIOCDELMULTI:
2328 if (cmd == SIOCADDMULTI)
2329 error = priv_check(td, PRIV_NET_ADDMULTI);
2330 else
2331 error = priv_check(td, PRIV_NET_DELMULTI);
2332 if (error)
2333 return (error);
2334
2335 /* Don't allow group membership on non-multicast interfaces. */
2336 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2337 return (EOPNOTSUPP);
2338
2339 /* Don't let users screw up protocols' entries. */
2340 if (ifr->ifr_addr.sa_family != AF_LINK)
2341 return (EINVAL);
2342
2343 if (cmd == SIOCADDMULTI) {
2344 struct ifmultiaddr *ifma;
2345
2346 /*
2347 * Userland is only permitted to join groups once
2348 * via the if_addmulti() KPI, because it cannot hold
2349 * struct ifmultiaddr * between calls. It may also
2350 * lose a race while we check if the membership
2351 * already exists.
2352 */
2353 IF_ADDR_LOCK(ifp);
2354 ifma = if_findmulti(ifp, &ifr->ifr_addr);
2355 IF_ADDR_UNLOCK(ifp);
2356 if (ifma != NULL)
2357 error = EADDRINUSE;
2358 else
2359 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2360 } else {
2361 error = if_delmulti(ifp, &ifr->ifr_addr);
2362 }
2363 if (error == 0)
2364 getmicrotime(&ifp->if_lastchange);
2365 break;
2366
2367 case SIOCSIFPHYADDR:
2368 case SIOCDIFPHYADDR:
2369 #ifdef INET6
2370 case SIOCSIFPHYADDR_IN6:
2371 #endif
2372 case SIOCSLIFPHYADDR:
2373 case SIOCSIFMEDIA:
2374 case SIOCSIFGENERIC:
2375 error = priv_check(td, PRIV_NET_HWIOCTL);
2376 if (error)
2377 return (error);
2378 if (ifp->if_ioctl == NULL)
2379 return (EOPNOTSUPP);
2380 error = (*ifp->if_ioctl)(ifp, cmd, data);
2381 if (error == 0)
2382 getmicrotime(&ifp->if_lastchange);
2383 break;
2384
2385 case SIOCGIFSTATUS:
2386 ifs = (struct ifstat *)data;
2387 ifs->ascii[0] = '\0';
2388
2389 case SIOCGIFPSRCADDR:
2390 case SIOCGIFPDSTADDR:
2391 case SIOCGLIFPHYADDR:
2392 case SIOCGIFMEDIA:
2393 case SIOCGIFGENERIC:
2394 if (ifp->if_ioctl == NULL)
2395 return (EOPNOTSUPP);
2396 error = (*ifp->if_ioctl)(ifp, cmd, data);
2397 break;
2398
2399 case SIOCSIFLLADDR:
2400 error = priv_check(td, PRIV_NET_SETLLADDR);
2401 if (error)
2402 return (error);
2403 error = if_setlladdr(ifp,
2404 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2405 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
2406 break;
2407
2408 case SIOCAIFGROUP:
2409 {
2410 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2411
2412 error = priv_check(td, PRIV_NET_ADDIFGROUP);
2413 if (error)
2414 return (error);
2415 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
2416 return (error);
2417 break;
2418 }
2419
2420 case SIOCGIFGROUP:
2421 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
2422 return (error);
2423 break;
2424
2425 case SIOCDIFGROUP:
2426 {
2427 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
2428
2429 error = priv_check(td, PRIV_NET_DELIFGROUP);
2430 if (error)
2431 return (error);
2432 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
2433 return (error);
2434 break;
2435 }
2436
2437 default:
2438 error = ENOIOCTL;
2439 break;
2440 }
2441 return (error);
2442 }
2443
2444 #ifdef COMPAT_FREEBSD32
2445 struct ifconf32 {
2446 int32_t ifc_len;
2447 union {
2448 uint32_t ifcu_buf;
2449 uint32_t ifcu_req;
2450 } ifc_ifcu;
2451 };
2452 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32)
2453 #endif
2454
2455 /*
2456 * Interface ioctls.
2457 */
2458 int
2459 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2460 {
2461 struct ifnet *ifp;
2462 struct ifreq *ifr;
2463 int error;
2464 int oif_flags;
2465
2466 CURVNET_SET(so->so_vnet);
2467 switch (cmd) {
2468 case SIOCGIFCONF:
2469 case OSIOCGIFCONF:
2470 error = ifconf(cmd, data);
2471 CURVNET_RESTORE();
2472 return (error);
2473
2474 #ifdef COMPAT_FREEBSD32
2475 case SIOCGIFCONF32:
2476 {
2477 struct ifconf32 *ifc32;
2478 struct ifconf ifc;
2479
2480 ifc32 = (struct ifconf32 *)data;
2481 ifc.ifc_len = ifc32->ifc_len;
2482 ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2483
2484 error = ifconf(SIOCGIFCONF, (void *)&ifc);
2485 CURVNET_RESTORE();
2486 if (error == 0)
2487 ifc32->ifc_len = ifc.ifc_len;
2488 return (error);
2489 }
2490 #endif
2491 }
2492 ifr = (struct ifreq *)data;
2493
2494 switch (cmd) {
2495 #ifdef VIMAGE
2496 case SIOCSIFRVNET:
2497 error = priv_check(td, PRIV_NET_SETIFVNET);
2498 if (error == 0)
2499 error = if_vmove_reclaim(td, ifr->ifr_name,
2500 ifr->ifr_jid);
2501 CURVNET_RESTORE();
2502 return (error);
2503 #endif
2504 case SIOCIFCREATE:
2505 case SIOCIFCREATE2:
2506 error = priv_check(td, PRIV_NET_IFCREATE);
2507 if (error == 0)
2508 error = if_clone_create(ifr->ifr_name,
2509 sizeof(ifr->ifr_name),
2510 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL);
2511 CURVNET_RESTORE();
2512 return (error);
2513 case SIOCIFDESTROY:
2514 error = priv_check(td, PRIV_NET_IFDESTROY);
2515 if (error == 0)
2516 error = if_clone_destroy(ifr->ifr_name);
2517 CURVNET_RESTORE();
2518 return (error);
2519
2520 case SIOCIFGCLONERS:
2521 error = if_clone_list((struct if_clonereq *)data);
2522 CURVNET_RESTORE();
2523 return (error);
2524 case SIOCGIFGMEMB:
2525 error = if_getgroupmembers((struct ifgroupreq *)data);
2526 CURVNET_RESTORE();
2527 return (error);
2528 }
2529
2530 ifp = ifunit_ref(ifr->ifr_name);
2531 if (ifp == NULL) {
2532 CURVNET_RESTORE();
2533 return (ENXIO);
2534 }
2535
2536 error = ifhwioctl(cmd, ifp, data, td);
2537 if (error != ENOIOCTL) {
2538 if_rele(ifp);
2539 CURVNET_RESTORE();
2540 return (error);
2541 }
2542
2543 oif_flags = ifp->if_flags;
2544 if (so->so_proto == NULL) {
2545 if_rele(ifp);
2546 CURVNET_RESTORE();
2547 return (EOPNOTSUPP);
2548 }
2549 #ifndef COMPAT_43
2550 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2551 data,
2552 ifp, td));
2553 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL)
2554 error = (*ifp->if_ioctl)(ifp, cmd, data);
2555 #else
2556 {
2557 u_long ocmd = cmd;
2558
2559 switch (cmd) {
2560
2561 case SIOCSIFDSTADDR:
2562 case SIOCSIFADDR:
2563 case SIOCSIFBRDADDR:
2564 case SIOCSIFNETMASK:
2565 #if BYTE_ORDER != BIG_ENDIAN
2566 if (ifr->ifr_addr.sa_family == 0 &&
2567 ifr->ifr_addr.sa_len < 16) {
2568 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2569 ifr->ifr_addr.sa_len = 16;
2570 }
2571 #else
2572 if (ifr->ifr_addr.sa_len == 0)
2573 ifr->ifr_addr.sa_len = 16;
2574 #endif
2575 break;
2576
2577 case OSIOCGIFADDR:
2578 cmd = SIOCGIFADDR;
2579 break;
2580
2581 case OSIOCGIFDSTADDR:
2582 cmd = SIOCGIFDSTADDR;
2583 break;
2584
2585 case OSIOCGIFBRDADDR:
2586 cmd = SIOCGIFBRDADDR;
2587 break;
2588
2589 case OSIOCGIFNETMASK:
2590 cmd = SIOCGIFNETMASK;
2591 }
2592 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2593 cmd,
2594 data,
2595 ifp, td));
2596 if (error == EOPNOTSUPP && ifp != NULL &&
2597 ifp->if_ioctl != NULL)
2598 error = (*ifp->if_ioctl)(ifp, cmd, data);
2599 switch (ocmd) {
2600
2601 case OSIOCGIFADDR:
2602 case OSIOCGIFDSTADDR:
2603 case OSIOCGIFBRDADDR:
2604 case OSIOCGIFNETMASK:
2605 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2606
2607 }
2608 }
2609 #endif /* COMPAT_43 */
2610
2611 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2612 #ifdef INET6
2613 if (ifp->if_flags & IFF_UP) {
2614 int s = splimp();
2615 in6_if_up(ifp);
2616 splx(s);
2617 }
2618 #endif
2619 }
2620 if_rele(ifp);
2621 CURVNET_RESTORE();
2622 return (error);
2623 }
2624
2625 /*
2626 * The code common to handling reference counted flags,
2627 * e.g., in ifpromisc() and if_allmulti().
2628 * The "pflag" argument can specify a permanent mode flag to check,
2629 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2630 *
2631 * Only to be used on stack-owned flags, not driver-owned flags.
2632 */
2633 static int
2634 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2635 {
2636 struct ifreq ifr;
2637 int error;
2638 int oldflags, oldcount;
2639
2640 /* Sanity checks to catch programming errors */
2641 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2642 ("%s: setting driver-owned flag %d", __func__, flag));
2643
2644 if (onswitch)
2645 KASSERT(*refcount >= 0,
2646 ("%s: increment negative refcount %d for flag %d",
2647 __func__, *refcount, flag));
2648 else
2649 KASSERT(*refcount > 0,
2650 ("%s: decrement non-positive refcount %d for flag %d",
2651 __func__, *refcount, flag));
2652
2653 /* In case this mode is permanent, just touch refcount */
2654 if (ifp->if_flags & pflag) {
2655 *refcount += onswitch ? 1 : -1;
2656 return (0);
2657 }
2658
2659 /* Save ifnet parameters for if_ioctl() may fail */
2660 oldcount = *refcount;
2661 oldflags = ifp->if_flags;
2662
2663 /*
2664 * See if we aren't the only and touching refcount is enough.
2665 * Actually toggle interface flag if we are the first or last.
2666 */
2667 if (onswitch) {
2668 if ((*refcount)++)
2669 return (0);
2670 ifp->if_flags |= flag;
2671 } else {
2672 if (--(*refcount))
2673 return (0);
2674 ifp->if_flags &= ~flag;
2675 }
2676
2677 /* Call down the driver since we've changed interface flags */
2678 if (ifp->if_ioctl == NULL) {
2679 error = EOPNOTSUPP;
2680 goto recover;
2681 }
2682 ifr.ifr_flags = ifp->if_flags & 0xffff;
2683 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2684 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2685 if (error)
2686 goto recover;
2687 /* Notify userland that interface flags have changed */
2688 rt_ifmsg(ifp);
2689 return (0);
2690
2691 recover:
2692 /* Recover after driver error */
2693 *refcount = oldcount;
2694 ifp->if_flags = oldflags;
2695 return (error);
2696 }
2697
2698 /*
2699 * Set/clear promiscuous mode on interface ifp based on the truth value
2700 * of pswitch. The calls are reference counted so that only the first
2701 * "on" request actually has an effect, as does the final "off" request.
2702 * Results are undefined if the "off" and "on" requests are not matched.
2703 */
2704 int
2705 ifpromisc(struct ifnet *ifp, int pswitch)
2706 {
2707 int error;
2708 int oldflags = ifp->if_flags;
2709
2710 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2711 &ifp->if_pcount, pswitch);
2712 /* If promiscuous mode status has changed, log a message */
2713 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2714 log(LOG_INFO, "%s: promiscuous mode %s\n",
2715 ifp->if_xname,
2716 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2717 return (error);
2718 }
2719
2720 /*
2721 * Return interface configuration
2722 * of system. List may be used
2723 * in later ioctl's (above) to get
2724 * other information.
2725 */
2726 /*ARGSUSED*/
2727 static int
2728 ifconf(u_long cmd, caddr_t data)
2729 {
2730 struct ifconf *ifc = (struct ifconf *)data;
2731 struct ifnet *ifp;
2732 struct ifaddr *ifa;
2733 struct ifreq ifr;
2734 struct sbuf *sb;
2735 int error, full = 0, valid_len, max_len;
2736
2737 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2738 max_len = MAXPHYS - 1;
2739
2740 /* Prevent hostile input from being able to crash the system */
2741 if (ifc->ifc_len <= 0)
2742 return (EINVAL);
2743
2744 again:
2745 if (ifc->ifc_len <= max_len) {
2746 max_len = ifc->ifc_len;
2747 full = 1;
2748 }
2749 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2750 max_len = 0;
2751 valid_len = 0;
2752
2753 IFNET_RLOCK();
2754 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2755 int addrs;
2756
2757 /*
2758 * Zero the ifr_name buffer to make sure we don't
2759 * disclose the contents of the stack.
2760 */
2761 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2762
2763 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2764 >= sizeof(ifr.ifr_name)) {
2765 sbuf_delete(sb);
2766 IFNET_RUNLOCK();
2767 return (ENAMETOOLONG);
2768 }
2769
2770 addrs = 0;
2771 IF_ADDR_LOCK(ifp);
2772 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2773 struct sockaddr *sa = ifa->ifa_addr;
2774
2775 if (prison_if(curthread->td_ucred, sa) != 0)
2776 continue;
2777 addrs++;
2778 #ifdef COMPAT_43
2779 if (cmd == OSIOCGIFCONF) {
2780 struct osockaddr *osa =
2781 (struct osockaddr *)&ifr.ifr_addr;
2782 ifr.ifr_addr = *sa;
2783 osa->sa_family = sa->sa_family;
2784 sbuf_bcat(sb, &ifr, sizeof(ifr));
2785 max_len += sizeof(ifr);
2786 } else
2787 #endif
2788 if (sa->sa_len <= sizeof(*sa)) {
2789 ifr.ifr_addr = *sa;
2790 sbuf_bcat(sb, &ifr, sizeof(ifr));
2791 max_len += sizeof(ifr);
2792 } else {
2793 sbuf_bcat(sb, &ifr,
2794 offsetof(struct ifreq, ifr_addr));
2795 max_len += offsetof(struct ifreq, ifr_addr);
2796 sbuf_bcat(sb, sa, sa->sa_len);
2797 max_len += sa->sa_len;
2798 }
2799
2800 if (sbuf_error(sb) == 0)
2801 valid_len = sbuf_len(sb);
2802 }
2803 IF_ADDR_UNLOCK(ifp);
2804 if (addrs == 0) {
2805 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
2806 sbuf_bcat(sb, &ifr, sizeof(ifr));
2807 max_len += sizeof(ifr);
2808
2809 if (sbuf_error(sb) == 0)
2810 valid_len = sbuf_len(sb);
2811 }
2812 }
2813 IFNET_RUNLOCK();
2814
2815 /*
2816 * If we didn't allocate enough space (uncommon), try again. If
2817 * we have already allocated as much space as we are allowed,
2818 * return what we've got.
2819 */
2820 if (valid_len != max_len && !full) {
2821 sbuf_delete(sb);
2822 goto again;
2823 }
2824
2825 ifc->ifc_len = valid_len;
2826 sbuf_finish(sb);
2827 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
2828 sbuf_delete(sb);
2829 return (error);
2830 }
2831
2832 /*
2833 * Just like ifpromisc(), but for all-multicast-reception mode.
2834 */
2835 int
2836 if_allmulti(struct ifnet *ifp, int onswitch)
2837 {
2838
2839 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
2840 }
2841
2842 struct ifmultiaddr *
2843 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
2844 {
2845 struct ifmultiaddr *ifma;
2846
2847 IF_ADDR_LOCK_ASSERT(ifp);
2848
2849 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2850 if (sa->sa_family == AF_LINK) {
2851 if (sa_dl_equal(ifma->ifma_addr, sa))
2852 break;
2853 } else {
2854 if (sa_equal(ifma->ifma_addr, sa))
2855 break;
2856 }
2857 }
2858
2859 return ifma;
2860 }
2861
2862 /*
2863 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
2864 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
2865 * the ifnet multicast address list here, so the caller must do that and
2866 * other setup work (such as notifying the device driver). The reference
2867 * count is initialized to 1.
2868 */
2869 static struct ifmultiaddr *
2870 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
2871 int mflags)
2872 {
2873 struct ifmultiaddr *ifma;
2874 struct sockaddr *dupsa;
2875
2876 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
2877 M_ZERO);
2878 if (ifma == NULL)
2879 return (NULL);
2880
2881 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
2882 if (dupsa == NULL) {
2883 free(ifma, M_IFMADDR);
2884 return (NULL);
2885 }
2886 bcopy(sa, dupsa, sa->sa_len);
2887 ifma->ifma_addr = dupsa;
2888
2889 ifma->ifma_ifp = ifp;
2890 ifma->ifma_refcount = 1;
2891 ifma->ifma_protospec = NULL;
2892
2893 if (llsa == NULL) {
2894 ifma->ifma_lladdr = NULL;
2895 return (ifma);
2896 }
2897
2898 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
2899 if (dupsa == NULL) {
2900 free(ifma->ifma_addr, M_IFMADDR);
2901 free(ifma, M_IFMADDR);
2902 return (NULL);
2903 }
2904 bcopy(llsa, dupsa, llsa->sa_len);
2905 ifma->ifma_lladdr = dupsa;
2906
2907 return (ifma);
2908 }
2909
2910 /*
2911 * if_freemulti: free ifmultiaddr structure and possibly attached related
2912 * addresses. The caller is responsible for implementing reference
2913 * counting, notifying the driver, handling routing messages, and releasing
2914 * any dependent link layer state.
2915 */
2916 static void
2917 if_freemulti(struct ifmultiaddr *ifma)
2918 {
2919
2920 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
2921 ifma->ifma_refcount));
2922 KASSERT(ifma->ifma_protospec == NULL,
2923 ("if_freemulti: protospec not NULL"));
2924
2925 if (ifma->ifma_lladdr != NULL)
2926 free(ifma->ifma_lladdr, M_IFMADDR);
2927 free(ifma->ifma_addr, M_IFMADDR);
2928 free(ifma, M_IFMADDR);
2929 }
2930
2931 /*
2932 * Register an additional multicast address with a network interface.
2933 *
2934 * - If the address is already present, bump the reference count on the
2935 * address and return.
2936 * - If the address is not link-layer, look up a link layer address.
2937 * - Allocate address structures for one or both addresses, and attach to the
2938 * multicast address list on the interface. If automatically adding a link
2939 * layer address, the protocol address will own a reference to the link
2940 * layer address, to be freed when it is freed.
2941 * - Notify the network device driver of an addition to the multicast address
2942 * list.
2943 *
2944 * 'sa' points to caller-owned memory with the desired multicast address.
2945 *
2946 * 'retifma' will be used to return a pointer to the resulting multicast
2947 * address reference, if desired.
2948 */
2949 int
2950 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
2951 struct ifmultiaddr **retifma)
2952 {
2953 struct ifmultiaddr *ifma, *ll_ifma;
2954 struct sockaddr *llsa;
2955 int error;
2956
2957 /*
2958 * If the address is already present, return a new reference to it;
2959 * otherwise, allocate storage and set up a new address.
2960 */
2961 IF_ADDR_LOCK(ifp);
2962 ifma = if_findmulti(ifp, sa);
2963 if (ifma != NULL) {
2964 ifma->ifma_refcount++;
2965 if (retifma != NULL)
2966 *retifma = ifma;
2967 IF_ADDR_UNLOCK(ifp);
2968 return (0);
2969 }
2970
2971 /*
2972 * The address isn't already present; resolve the protocol address
2973 * into a link layer address, and then look that up, bump its
2974 * refcount or allocate an ifma for that also. If 'llsa' was
2975 * returned, we will need to free it later.
2976 */
2977 llsa = NULL;
2978 ll_ifma = NULL;
2979 if (ifp->if_resolvemulti != NULL) {
2980 error = ifp->if_resolvemulti(ifp, &llsa, sa);
2981 if (error)
2982 goto unlock_out;
2983 }
2984
2985 /*
2986 * Allocate the new address. Don't hook it up yet, as we may also
2987 * need to allocate a link layer multicast address.
2988 */
2989 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
2990 if (ifma == NULL) {
2991 error = ENOMEM;
2992 goto free_llsa_out;
2993 }
2994
2995 /*
2996 * If a link layer address is found, we'll need to see if it's
2997 * already present in the address list, or allocate is as well.
2998 * When this block finishes, the link layer address will be on the
2999 * list.
3000 */
3001 if (llsa != NULL) {
3002 ll_ifma = if_findmulti(ifp, llsa);
3003 if (ll_ifma == NULL) {
3004 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3005 if (ll_ifma == NULL) {
3006 --ifma->ifma_refcount;
3007 if_freemulti(ifma);
3008 error = ENOMEM;
3009 goto free_llsa_out;
3010 }
3011 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3012 ifma_link);
3013 } else
3014 ll_ifma->ifma_refcount++;
3015 ifma->ifma_llifma = ll_ifma;
3016 }
3017
3018 /*
3019 * We now have a new multicast address, ifma, and possibly a new or
3020 * referenced link layer address. Add the primary address to the
3021 * ifnet address list.
3022 */
3023 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3024
3025 if (retifma != NULL)
3026 *retifma = ifma;
3027
3028 /*
3029 * Must generate the message while holding the lock so that 'ifma'
3030 * pointer is still valid.
3031 */
3032 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3033 IF_ADDR_UNLOCK(ifp);
3034
3035 /*
3036 * We are certain we have added something, so call down to the
3037 * interface to let them know about it.
3038 */
3039 if (ifp->if_ioctl != NULL) {
3040 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3041 }
3042
3043 if (llsa != NULL)
3044 free(llsa, M_IFMADDR);
3045
3046 return (0);
3047
3048 free_llsa_out:
3049 if (llsa != NULL)
3050 free(llsa, M_IFMADDR);
3051
3052 unlock_out:
3053 IF_ADDR_UNLOCK(ifp);
3054 return (error);
3055 }
3056
3057 /*
3058 * Delete a multicast group membership by network-layer group address.
3059 *
3060 * Returns ENOENT if the entry could not be found. If ifp no longer
3061 * exists, results are undefined. This entry point should only be used
3062 * from subsystems which do appropriate locking to hold ifp for the
3063 * duration of the call.
3064 * Network-layer protocol domains must use if_delmulti_ifma().
3065 */
3066 int
3067 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3068 {
3069 struct ifmultiaddr *ifma;
3070 int lastref;
3071 #ifdef INVARIANTS
3072 struct ifnet *oifp;
3073
3074 IFNET_RLOCK_NOSLEEP();
3075 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3076 if (ifp == oifp)
3077 break;
3078 if (ifp != oifp)
3079 ifp = NULL;
3080 IFNET_RUNLOCK_NOSLEEP();
3081
3082 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
3083 #endif
3084 if (ifp == NULL)
3085 return (ENOENT);
3086
3087 IF_ADDR_LOCK(ifp);
3088 lastref = 0;
3089 ifma = if_findmulti(ifp, sa);
3090 if (ifma != NULL)
3091 lastref = if_delmulti_locked(ifp, ifma, 0);
3092 IF_ADDR_UNLOCK(ifp);
3093
3094 if (ifma == NULL)
3095 return (ENOENT);
3096
3097 if (lastref && ifp->if_ioctl != NULL) {
3098 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3099 }
3100
3101 return (0);
3102 }
3103
3104 /*
3105 * Delete all multicast group membership for an interface.
3106 * Should be used to quickly flush all multicast filters.
3107 */
3108 void
3109 if_delallmulti(struct ifnet *ifp)
3110 {
3111 struct ifmultiaddr *ifma;
3112 struct ifmultiaddr *next;
3113
3114 IF_ADDR_LOCK(ifp);
3115 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3116 if_delmulti_locked(ifp, ifma, 0);
3117 IF_ADDR_UNLOCK(ifp);
3118 }
3119
3120 /*
3121 * Delete a multicast group membership by group membership pointer.
3122 * Network-layer protocol domains must use this routine.
3123 *
3124 * It is safe to call this routine if the ifp disappeared.
3125 */
3126 void
3127 if_delmulti_ifma(struct ifmultiaddr *ifma)
3128 {
3129 struct ifnet *ifp;
3130 int lastref;
3131
3132 ifp = ifma->ifma_ifp;
3133 #ifdef DIAGNOSTIC
3134 if (ifp == NULL) {
3135 printf("%s: ifma_ifp seems to be detached\n", __func__);
3136 } else {
3137 struct ifnet *oifp;
3138
3139 IFNET_RLOCK_NOSLEEP();
3140 TAILQ_FOREACH(oifp, &V_ifnet, if_link)
3141 if (ifp == oifp)
3142 break;
3143 if (ifp != oifp) {
3144 printf("%s: ifnet %p disappeared\n", __func__, ifp);
3145 ifp = NULL;
3146 }
3147 IFNET_RUNLOCK_NOSLEEP();
3148 }
3149 #endif
3150 /*
3151 * If and only if the ifnet instance exists: Acquire the address lock.
3152 */
3153 if (ifp != NULL)
3154 IF_ADDR_LOCK(ifp);
3155
3156 lastref = if_delmulti_locked(ifp, ifma, 0);
3157
3158 if (ifp != NULL) {
3159 /*
3160 * If and only if the ifnet instance exists:
3161 * Release the address lock.
3162 * If the group was left: update the hardware hash filter.
3163 */
3164 IF_ADDR_UNLOCK(ifp);
3165 if (lastref && ifp->if_ioctl != NULL) {
3166 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3167 }
3168 }
3169 }
3170
3171 /*
3172 * Perform deletion of network-layer and/or link-layer multicast address.
3173 *
3174 * Return 0 if the reference count was decremented.
3175 * Return 1 if the final reference was released, indicating that the
3176 * hardware hash filter should be reprogrammed.
3177 */
3178 static int
3179 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3180 {
3181 struct ifmultiaddr *ll_ifma;
3182
3183 if (ifp != NULL && ifma->ifma_ifp != NULL) {
3184 KASSERT(ifma->ifma_ifp == ifp,
3185 ("%s: inconsistent ifp %p", __func__, ifp));
3186 IF_ADDR_LOCK_ASSERT(ifp);
3187 }
3188
3189 ifp = ifma->ifma_ifp;
3190
3191 /*
3192 * If the ifnet is detaching, null out references to ifnet,
3193 * so that upper protocol layers will notice, and not attempt
3194 * to obtain locks for an ifnet which no longer exists. The
3195 * routing socket announcement must happen before the ifnet
3196 * instance is detached from the system.
3197 */
3198 if (detaching) {
3199 #ifdef DIAGNOSTIC
3200 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3201 #endif
3202 /*
3203 * ifp may already be nulled out if we are being reentered
3204 * to delete the ll_ifma.
3205 */
3206 if (ifp != NULL) {
3207 rt_newmaddrmsg(RTM_DELMADDR, ifma);
3208 ifma->ifma_ifp = NULL;
3209 }
3210 }
3211
3212 if (--ifma->ifma_refcount > 0)
3213 return 0;
3214
3215 /*
3216 * If this ifma is a network-layer ifma, a link-layer ifma may
3217 * have been associated with it. Release it first if so.
3218 */
3219 ll_ifma = ifma->ifma_llifma;
3220 if (ll_ifma != NULL) {
3221 KASSERT(ifma->ifma_lladdr != NULL,
3222 ("%s: llifma w/o lladdr", __func__));
3223 if (detaching)
3224 ll_ifma->ifma_ifp = NULL; /* XXX */
3225 if (--ll_ifma->ifma_refcount == 0) {
3226 if (ifp != NULL) {
3227 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
3228 ifma_link);
3229 }
3230 if_freemulti(ll_ifma);
3231 }
3232 }
3233
3234 if (ifp != NULL)
3235 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
3236
3237 if_freemulti(ifma);
3238
3239 /*
3240 * The last reference to this instance of struct ifmultiaddr
3241 * was released; the hardware should be notified of this change.
3242 */
3243 return 1;
3244 }
3245
3246 /*
3247 * Set the link layer address on an interface.
3248 *
3249 * At this time we only support certain types of interfaces,
3250 * and we don't allow the length of the address to change.
3251 */
3252 int
3253 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3254 {
3255 struct sockaddr_dl *sdl;
3256 struct ifaddr *ifa;
3257 struct ifreq ifr;
3258
3259 IF_ADDR_LOCK(ifp);
3260 ifa = ifp->if_addr;
3261 if (ifa == NULL) {
3262 IF_ADDR_UNLOCK(ifp);
3263 return (EINVAL);
3264 }
3265 ifa_ref(ifa);
3266 IF_ADDR_UNLOCK(ifp);
3267 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3268 if (sdl == NULL) {
3269 ifa_free(ifa);
3270 return (EINVAL);
3271 }
3272 if (len != sdl->sdl_alen) { /* don't allow length to change */
3273 ifa_free(ifa);
3274 return (EINVAL);
3275 }
3276 switch (ifp->if_type) {
3277 case IFT_ETHER:
3278 case IFT_FDDI:
3279 case IFT_XETHER:
3280 case IFT_ISO88025:
3281 case IFT_L2VLAN:
3282 case IFT_BRIDGE:
3283 case IFT_ARCNET:
3284 case IFT_IEEE8023ADLAG:
3285 case IFT_IEEE80211:
3286 bcopy(lladdr, LLADDR(sdl), len);
3287 ifa_free(ifa);
3288 break;
3289 default:
3290 ifa_free(ifa);
3291 return (ENODEV);
3292 }
3293
3294 /*
3295 * If the interface is already up, we need
3296 * to re-init it in order to reprogram its
3297 * address filter.
3298 */
3299 if ((ifp->if_flags & IFF_UP) != 0) {
3300 if (ifp->if_ioctl) {
3301 ifp->if_flags &= ~IFF_UP;
3302 ifr.ifr_flags = ifp->if_flags & 0xffff;
3303 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3304 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3305 ifp->if_flags |= IFF_UP;
3306 ifr.ifr_flags = ifp->if_flags & 0xffff;
3307 ifr.ifr_flagshigh = ifp->if_flags >> 16;
3308 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3309 }
3310 #ifdef INET
3311 /*
3312 * Also send gratuitous ARPs to notify other nodes about
3313 * the address change.
3314 */
3315 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3316 if (ifa->ifa_addr->sa_family == AF_INET)
3317 arp_ifinit(ifp, ifa);
3318 }
3319 #endif
3320 }
3321 return (0);
3322 }
3323
3324 /*
3325 * The name argument must be a pointer to storage which will last as
3326 * long as the interface does. For physical devices, the result of
3327 * device_get_name(dev) is a good choice and for pseudo-devices a
3328 * static string works well.
3329 */
3330 void
3331 if_initname(struct ifnet *ifp, const char *name, int unit)
3332 {
3333 ifp->if_dname = name;
3334 ifp->if_dunit = unit;
3335 if (unit != IF_DUNIT_NONE)
3336 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3337 else
3338 strlcpy(ifp->if_xname, name, IFNAMSIZ);
3339 }
3340
3341 int
3342 if_printf(struct ifnet *ifp, const char * fmt, ...)
3343 {
3344 va_list ap;
3345 int retval;
3346
3347 retval = printf("%s: ", ifp->if_xname);
3348 va_start(ap, fmt);
3349 retval += vprintf(fmt, ap);
3350 va_end(ap);
3351 return (retval);
3352 }
3353
3354 void
3355 if_start(struct ifnet *ifp)
3356 {
3357
3358 (*(ifp)->if_start)(ifp);
3359 }
3360
3361 /*
3362 * Backwards compatibility interface for drivers
3363 * that have not implemented it
3364 */
3365 static int
3366 if_transmit(struct ifnet *ifp, struct mbuf *m)
3367 {
3368 int error;
3369
3370 IFQ_HANDOFF(ifp, m, error);
3371 return (error);
3372 }
3373
3374 int
3375 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
3376 {
3377 int active = 0;
3378
3379 IF_LOCK(ifq);
3380 if (_IF_QFULL(ifq)) {
3381 _IF_DROP(ifq);
3382 IF_UNLOCK(ifq);
3383 m_freem(m);
3384 return (0);
3385 }
3386 if (ifp != NULL) {
3387 ifp->if_obytes += m->m_pkthdr.len + adjust;
3388 if (m->m_flags & (M_BCAST|M_MCAST))
3389 ifp->if_omcasts++;
3390 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
3391 }
3392 _IF_ENQUEUE(ifq, m);
3393 IF_UNLOCK(ifq);
3394 if (ifp != NULL && !active)
3395 (*(ifp)->if_start)(ifp);
3396 return (1);
3397 }
3398
3399 void
3400 if_register_com_alloc(u_char type,
3401 if_com_alloc_t *a, if_com_free_t *f)
3402 {
3403
3404 KASSERT(if_com_alloc[type] == NULL,
3405 ("if_register_com_alloc: %d already registered", type));
3406 KASSERT(if_com_free[type] == NULL,
3407 ("if_register_com_alloc: %d free already registered", type));
3408
3409 if_com_alloc[type] = a;
3410 if_com_free[type] = f;
3411 }
3412
3413 void
3414 if_deregister_com_alloc(u_char type)
3415 {
3416
3417 KASSERT(if_com_alloc[type] != NULL,
3418 ("if_deregister_com_alloc: %d not registered", type));
3419 KASSERT(if_com_free[type] != NULL,
3420 ("if_deregister_com_alloc: %d free not registered", type));
3421 if_com_alloc[type] = NULL;
3422 if_com_free[type] = NULL;
3423 }
Cache object: 2687255cc98ce6971eb770263d848dd3
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