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 * $FreeBSD$
31 */
32
33 #include "opt_compat.h"
34 #include "opt_inet6.h"
35 #include "opt_inet.h"
36 #include "opt_mac.h"
37 #include "opt_carp.h"
38
39 #include <sys/param.h>
40 #include <sys/types.h>
41 #include <sys/conf.h>
42 #include <sys/malloc.h>
43 #include <sys/sbuf.h>
44 #include <sys/bus.h>
45 #include <sys/mbuf.h>
46 #include <sys/systm.h>
47 #include <sys/priv.h>
48 #include <sys/proc.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/protosw.h>
52 #include <sys/kernel.h>
53 #include <sys/sockio.h>
54 #include <sys/syslog.h>
55 #include <sys/sysctl.h>
56 #include <sys/taskqueue.h>
57 #include <sys/domain.h>
58 #include <sys/jail.h>
59 #include <machine/stdarg.h>
60
61 #include <net/if.h>
62 #include <net/if_clone.h>
63 #include <net/if_dl.h>
64 #include <net/if_types.h>
65 #include <net/if_var.h>
66 #include <net/radix.h>
67 #include <net/route.h>
68
69 #if defined(INET) || defined(INET6)
70 /*XXX*/
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73 #ifdef INET6
74 #include <netinet6/in6_var.h>
75 #include <netinet6/in6_ifattach.h>
76 #endif
77 #endif
78 #ifdef INET
79 #include <netinet/if_ether.h>
80 #endif
81 #ifdef DEV_CARP
82 #include <netinet/ip_carp.h>
83 #endif
84
85 #include <security/mac/mac_framework.h>
86
87 static int slowtimo_started;
88
89 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
90 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
91
92 /* Log link state change events */
93 static int log_link_state_change = 1;
94
95 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
96 &log_link_state_change, 0,
97 "log interface link state change events");
98
99 void (*bstp_linkstate_p)(struct ifnet *ifp, int state);
100 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
101 void (*lagg_linkstate_p)(struct ifnet *ifp, int state);
102
103 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
104
105 /*
106 * XXX: Style; these should be sorted alphabetically, and unprototyped
107 * static functions should be prototyped. Currently they are sorted by
108 * declaration order.
109 */
110 static void if_attachdomain(void *);
111 static void if_attachdomain1(struct ifnet *);
112 static void if_purgemaddrs(struct ifnet *);
113 static int ifconf(u_long, caddr_t);
114 static void if_freemulti(struct ifmultiaddr *);
115 static void if_grow(void);
116 static void if_init(void *);
117 static void if_check(void *);
118 static void if_qflush(struct ifaltq *);
119 static void if_route(struct ifnet *, int flag, int fam);
120 static int if_setflag(struct ifnet *, int, int, int *, int);
121 static void if_slowtimo(void *);
122 static void if_unroute(struct ifnet *, int flag, int fam);
123 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
124 static int if_rtdel(struct radix_node *, void *);
125 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
126 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
127 static void if_start_deferred(void *context, int pending);
128 static void do_link_state_change(void *, int);
129 static int if_getgroup(struct ifgroupreq *, struct ifnet *);
130 static int if_getgroupmembers(struct ifgroupreq *);
131 static void if_delgroups(struct ifnet *);
132 #ifdef INET6
133 /*
134 * XXX: declare here to avoid to include many inet6 related files..
135 * should be more generalized?
136 */
137 extern void nd6_setmtu(struct ifnet *);
138 #endif
139
140 int if_index = 0;
141 int ifqmaxlen = IFQ_MAXLEN;
142 struct ifnethead ifnet; /* depend on static init XXX */
143 struct ifgrouphead ifg_head;
144 struct mtx ifnet_lock;
145 static if_com_alloc_t *if_com_alloc[256];
146 static if_com_free_t *if_com_free[256];
147
148 static int if_indexlim = 8;
149 static struct knlist ifklist;
150
151 /*
152 * Table of ifnet/cdev by index. Locked with ifnet_lock.
153 */
154 static struct ifindex_entry *ifindex_table = NULL;
155
156 static void filt_netdetach(struct knote *kn);
157 static int filt_netdev(struct knote *kn, long hint);
158
159 static struct filterops netdev_filtops =
160 { 1, NULL, filt_netdetach, filt_netdev };
161
162 /*
163 * System initialization
164 */
165 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL);
166 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL);
167
168 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
169 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
170 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
171
172 struct ifnet *
173 ifnet_byindex(u_short idx)
174 {
175 struct ifnet *ifp;
176
177 IFNET_RLOCK();
178 ifp = ifindex_table[idx].ife_ifnet;
179 IFNET_RUNLOCK();
180 return (ifp);
181 }
182
183 static void
184 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
185 {
186
187 IFNET_WLOCK_ASSERT();
188
189 ifindex_table[idx].ife_ifnet = ifp;
190 }
191
192 struct ifaddr *
193 ifaddr_byindex(u_short idx)
194 {
195 struct ifaddr *ifa;
196
197 IFNET_RLOCK();
198 ifa = ifnet_byindex(idx)->if_addr;
199 IFNET_RUNLOCK();
200 return (ifa);
201 }
202
203 struct cdev *
204 ifdev_byindex(u_short idx)
205 {
206 struct cdev *cdev;
207
208 IFNET_RLOCK();
209 cdev = ifindex_table[idx].ife_dev;
210 IFNET_RUNLOCK();
211 return (cdev);
212 }
213
214 static void
215 ifdev_setbyindex(u_short idx, struct cdev *cdev)
216 {
217
218 IFNET_WLOCK();
219 ifindex_table[idx].ife_dev = cdev;
220 IFNET_WUNLOCK();
221 }
222
223 static d_open_t netopen;
224 static d_close_t netclose;
225 static d_ioctl_t netioctl;
226 static d_kqfilter_t netkqfilter;
227
228 static struct cdevsw net_cdevsw = {
229 .d_version = D_VERSION,
230 .d_flags = D_NEEDGIANT,
231 .d_open = netopen,
232 .d_close = netclose,
233 .d_ioctl = netioctl,
234 .d_name = "net",
235 .d_kqfilter = netkqfilter,
236 };
237
238 static int
239 netopen(struct cdev *dev, int flag, int mode, struct thread *td)
240 {
241 return (0);
242 }
243
244 static int
245 netclose(struct cdev *dev, int flags, int fmt, struct thread *td)
246 {
247 return (0);
248 }
249
250 static int
251 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
252 {
253 struct ifnet *ifp;
254 int error, idx;
255
256 /* only support interface specific ioctls */
257 if (IOCGROUP(cmd) != 'i')
258 return (EOPNOTSUPP);
259 idx = minor(dev);
260 if (idx == 0) {
261 /*
262 * special network device, not interface.
263 */
264 if (cmd == SIOCGIFCONF)
265 return (ifconf(cmd, data)); /* XXX remove cmd */
266 #ifdef __amd64__
267 if (cmd == SIOCGIFCONF32)
268 return (ifconf(cmd, data)); /* XXX remove cmd */
269 #endif
270 return (EOPNOTSUPP);
271 }
272
273 ifp = ifnet_byindex(idx);
274 if (ifp == NULL)
275 return (ENXIO);
276
277 error = ifhwioctl(cmd, ifp, data, td);
278 if (error == ENOIOCTL)
279 error = EOPNOTSUPP;
280 return (error);
281 }
282
283 static int
284 netkqfilter(struct cdev *dev, struct knote *kn)
285 {
286 struct knlist *klist;
287 struct ifnet *ifp;
288 int idx;
289
290 switch (kn->kn_filter) {
291 case EVFILT_NETDEV:
292 kn->kn_fop = &netdev_filtops;
293 break;
294 default:
295 return (EINVAL);
296 }
297
298 idx = minor(dev);
299 if (idx == 0) {
300 klist = &ifklist;
301 } else {
302 ifp = ifnet_byindex(idx);
303 if (ifp == NULL)
304 return (1);
305 klist = &ifp->if_klist;
306 }
307
308 kn->kn_hook = (caddr_t)klist;
309
310 knlist_add(klist, kn, 0);
311
312 return (0);
313 }
314
315 static void
316 filt_netdetach(struct knote *kn)
317 {
318 struct knlist *klist = (struct knlist *)kn->kn_hook;
319
320 knlist_remove(klist, kn, 0);
321 }
322
323 static int
324 filt_netdev(struct knote *kn, long hint)
325 {
326 struct knlist *klist = (struct knlist *)kn->kn_hook;
327
328 /*
329 * Currently NOTE_EXIT is abused to indicate device detach.
330 */
331 if (hint == NOTE_EXIT) {
332 kn->kn_data = NOTE_LINKINV;
333 kn->kn_flags |= (EV_EOF | EV_ONESHOT);
334 knlist_remove_inevent(klist, kn);
335 return (1);
336 }
337 if (hint != 0)
338 kn->kn_data = hint; /* current status */
339 if (kn->kn_sfflags & hint)
340 kn->kn_fflags |= hint;
341 return (kn->kn_fflags != 0);
342 }
343
344 /*
345 * Network interface utility routines.
346 *
347 * Routines with ifa_ifwith* names take sockaddr *'s as
348 * parameters.
349 */
350
351 /* ARGSUSED*/
352 static void
353 if_init(void *dummy __unused)
354 {
355
356 IFNET_LOCK_INIT();
357 TAILQ_INIT(&ifnet);
358 TAILQ_INIT(&ifg_head);
359 knlist_init(&ifklist, NULL, NULL, NULL, NULL);
360 if_grow(); /* create initial table */
361 ifdev_setbyindex(0, make_dev(&net_cdevsw, 0, UID_ROOT, GID_WHEEL,
362 0600, "network"));
363 if_clone_init();
364 }
365
366 static void
367 if_grow(void)
368 {
369 u_int n;
370 struct ifindex_entry *e;
371
372 if_indexlim <<= 1;
373 n = if_indexlim * sizeof(*e);
374 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
375 if (ifindex_table != NULL) {
376 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2);
377 free((caddr_t)ifindex_table, M_IFNET);
378 }
379 ifindex_table = e;
380 }
381
382 /* ARGSUSED*/
383 static void
384 if_check(void *dummy __unused)
385 {
386 struct ifnet *ifp;
387 int s;
388
389 s = splimp();
390 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */
391 TAILQ_FOREACH(ifp, &ifnet, if_link) {
392 if (ifp->if_snd.ifq_maxlen == 0) {
393 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
394 ifp->if_snd.ifq_maxlen = ifqmaxlen;
395 }
396 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) {
397 if_printf(ifp,
398 "XXX: driver didn't initialize queue mtx\n");
399 mtx_init(&ifp->if_snd.ifq_mtx, "unknown",
400 MTX_NETWORK_LOCK, MTX_DEF);
401 }
402 }
403 IFNET_RUNLOCK();
404 splx(s);
405
406 /*
407 * If at least one interface added during boot uses
408 * if_watchdog then start the timer.
409 */
410 if (slowtimo_started)
411 if_slowtimo(0);
412 }
413
414 /*
415 * Allocate a struct ifnet and an index for an interface. A layer 2
416 * common structure will also be allocated if an allocation routine is
417 * registered for the passed type.
418 */
419 struct ifnet*
420 if_alloc(u_char type)
421 {
422 struct ifnet *ifp;
423
424 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
425
426 /*
427 * Try to find an empty slot below if_index. If we fail, take
428 * the next slot.
429 *
430 * XXX: should be locked!
431 */
432 for (ifp->if_index = 1; ifp->if_index <= if_index; ifp->if_index++) {
433 if (ifnet_byindex(ifp->if_index) == NULL)
434 break;
435 }
436 /* Catch if_index overflow. */
437 if (ifp->if_index < 1) {
438 free(ifp, M_IFNET);
439 return (NULL);
440 }
441 if (ifp->if_index > if_index)
442 if_index = ifp->if_index;
443 if (if_index >= if_indexlim)
444 if_grow();
445
446 ifp->if_type = type;
447
448 if (if_com_alloc[type] != NULL) {
449 ifp->if_l2com = if_com_alloc[type](type, ifp);
450 if (ifp->if_l2com == NULL) {
451 free(ifp, M_IFNET);
452 return (NULL);
453 }
454 }
455 IFNET_WLOCK();
456 ifnet_setbyindex(ifp->if_index, ifp);
457 IFNET_WUNLOCK();
458 IF_ADDR_LOCK_INIT(ifp);
459
460 return (ifp);
461 }
462
463 /*
464 * Free the struct ifnet, the associated index, and the layer 2 common
465 * structure if needed. All the work is done in if_free_type().
466 *
467 * Do not add code to this function! Add it to if_free_type().
468 */
469 void
470 if_free(struct ifnet *ifp)
471 {
472
473 if_free_type(ifp, ifp->if_type);
474 }
475
476 /*
477 * Do the actual work of freeing a struct ifnet, associated index, and
478 * layer 2 common structure. This version should only be called by
479 * intefaces that switch their type after calling if_alloc().
480 */
481 void
482 if_free_type(struct ifnet *ifp, u_char type)
483 {
484
485 if (ifp != ifnet_byindex(ifp->if_index)) {
486 if_printf(ifp, "%s: value was not if_alloced, skipping\n",
487 __func__);
488 return;
489 }
490
491 IFNET_WLOCK();
492 ifnet_setbyindex(ifp->if_index, NULL);
493
494 /* XXX: should be locked with if_findindex() */
495 while (if_index > 0 && ifnet_byindex(if_index) == NULL)
496 if_index--;
497 IFNET_WUNLOCK();
498
499 if (if_com_free[type] != NULL)
500 if_com_free[type](ifp->if_l2com, type);
501
502 IF_ADDR_LOCK_DESTROY(ifp);
503 free(ifp, M_IFNET);
504 };
505
506 /*
507 * Perform generic interface initalization tasks and attach the interface
508 * to the list of "active" interfaces.
509 *
510 * XXX:
511 * - The decision to return void and thus require this function to
512 * succeed is questionable.
513 * - We do more initialization here then is probably a good idea.
514 * Some of this should probably move to if_alloc().
515 * - We should probably do more sanity checking. For instance we don't
516 * do anything to insure if_xname is unique or non-empty.
517 */
518 void
519 if_attach(struct ifnet *ifp)
520 {
521 unsigned socksize, ifasize;
522 int namelen, masklen;
523 struct sockaddr_dl *sdl;
524 struct ifaddr *ifa;
525
526 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
527 panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
528 ifp->if_xname);
529
530 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp);
531 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
532 IF_AFDATA_LOCK_INIT(ifp);
533 ifp->if_afdata_initialized = 0;
534
535 TAILQ_INIT(&ifp->if_addrhead);
536 TAILQ_INIT(&ifp->if_prefixhead);
537 TAILQ_INIT(&ifp->if_multiaddrs);
538 TAILQ_INIT(&ifp->if_groups);
539
540 if_addgroup(ifp, IFG_ALL);
541
542 knlist_init(&ifp->if_klist, NULL, NULL, NULL, NULL);
543 getmicrotime(&ifp->if_lastchange);
544 ifp->if_data.ifi_epoch = time_uptime;
545 ifp->if_data.ifi_datalen = sizeof(struct if_data);
546
547 #ifdef MAC
548 mac_init_ifnet(ifp);
549 mac_create_ifnet(ifp);
550 #endif
551
552 ifdev_setbyindex(ifp->if_index, make_dev(&net_cdevsw,
553 unit2minor(ifp->if_index), UID_ROOT, GID_WHEEL, 0600, "%s/%s",
554 net_cdevsw.d_name, ifp->if_xname));
555 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d",
556 net_cdevsw.d_name, ifp->if_index);
557
558 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
559
560 /*
561 * create a Link Level name for this device
562 */
563 namelen = strlen(ifp->if_xname);
564 /*
565 * Always save enough space for any possiable name so we can do
566 * a rename in place later.
567 */
568 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
569 socksize = masklen + ifp->if_addrlen;
570 if (socksize < sizeof(*sdl))
571 socksize = sizeof(*sdl);
572 socksize = roundup2(socksize, sizeof(long));
573 ifasize = sizeof(*ifa) + 2 * socksize;
574 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
575 IFA_LOCK_INIT(ifa);
576 sdl = (struct sockaddr_dl *)(ifa + 1);
577 sdl->sdl_len = socksize;
578 sdl->sdl_family = AF_LINK;
579 bcopy(ifp->if_xname, sdl->sdl_data, namelen);
580 sdl->sdl_nlen = namelen;
581 sdl->sdl_index = ifp->if_index;
582 sdl->sdl_type = ifp->if_type;
583 ifp->if_addr = ifa;
584 ifa->ifa_ifp = ifp;
585 ifa->ifa_rtrequest = link_rtrequest;
586 ifa->ifa_addr = (struct sockaddr *)sdl;
587 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
588 ifa->ifa_netmask = (struct sockaddr *)sdl;
589 sdl->sdl_len = masklen;
590 while (namelen != 0)
591 sdl->sdl_data[--namelen] = 0xff;
592 ifa->ifa_refcnt = 1;
593 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
594 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */
595 ifp->if_snd.altq_type = 0;
596 ifp->if_snd.altq_disc = NULL;
597 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE;
598 ifp->if_snd.altq_tbr = NULL;
599 ifp->if_snd.altq_ifp = ifp;
600
601 IFNET_WLOCK();
602 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
603 IFNET_WUNLOCK();
604
605 if (domain_init_status >= 2)
606 if_attachdomain1(ifp);
607
608 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
609 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
610
611 /* Announce the interface. */
612 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
613
614 if (ifp->if_watchdog != NULL) {
615 if_printf(ifp,
616 "WARNING: using obsoleted if_watchdog interface\n");
617
618 /*
619 * Note that we need if_slowtimo(). If this happens after
620 * boot, then call if_slowtimo() directly.
621 */
622 if (atomic_cmpset_int(&slowtimo_started, 0, 1) && !cold)
623 if_slowtimo(0);
624 }
625 if (ifp->if_flags & IFF_NEEDSGIANT)
626 if_printf(ifp,
627 "WARNING: using obsoleted IFF_NEEDSGIANT flag\n");
628 }
629
630 static void
631 if_attachdomain(void *dummy)
632 {
633 struct ifnet *ifp;
634 int s;
635
636 s = splnet();
637 TAILQ_FOREACH(ifp, &ifnet, if_link)
638 if_attachdomain1(ifp);
639 splx(s);
640 }
641 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
642 if_attachdomain, NULL);
643
644 static void
645 if_attachdomain1(struct ifnet *ifp)
646 {
647 struct domain *dp;
648 int s;
649
650 s = splnet();
651
652 /*
653 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
654 * cannot lock ifp->if_afdata initialization, entirely.
655 */
656 if (IF_AFDATA_TRYLOCK(ifp) == 0) {
657 splx(s);
658 return;
659 }
660 if (ifp->if_afdata_initialized >= domain_init_status) {
661 IF_AFDATA_UNLOCK(ifp);
662 splx(s);
663 printf("if_attachdomain called more than once on %s\n",
664 ifp->if_xname);
665 return;
666 }
667 ifp->if_afdata_initialized = domain_init_status;
668 IF_AFDATA_UNLOCK(ifp);
669
670 /* address family dependent data region */
671 bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
672 for (dp = domains; dp; dp = dp->dom_next) {
673 if (dp->dom_ifattach)
674 ifp->if_afdata[dp->dom_family] =
675 (*dp->dom_ifattach)(ifp);
676 }
677
678 splx(s);
679 }
680
681 /*
682 * Remove any unicast or broadcast network addresses from an interface.
683 */
684 void
685 if_purgeaddrs(struct ifnet *ifp)
686 {
687 struct ifaddr *ifa, *next;
688
689 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
690 if (ifa->ifa_addr->sa_family == AF_LINK)
691 continue;
692 #ifdef INET
693 /* XXX: Ugly!! ad hoc just for INET */
694 if (ifa->ifa_addr->sa_family == AF_INET) {
695 struct ifaliasreq ifr;
696
697 bzero(&ifr, sizeof(ifr));
698 ifr.ifra_addr = *ifa->ifa_addr;
699 if (ifa->ifa_dstaddr)
700 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
701 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
702 NULL) == 0)
703 continue;
704 }
705 #endif /* INET */
706 #ifdef INET6
707 if (ifa->ifa_addr->sa_family == AF_INET6) {
708 in6_purgeaddr(ifa);
709 /* ifp_addrhead is already updated */
710 continue;
711 }
712 #endif /* INET6 */
713 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
714 IFAFREE(ifa);
715 }
716 }
717
718 /*
719 * Remove any multicast network addresses from an interface.
720 */
721 static void
722 if_purgemaddrs(struct ifnet *ifp)
723 {
724 struct ifmultiaddr *ifma;
725 struct ifmultiaddr *next;
726
727 IF_ADDR_LOCK(ifp);
728 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
729 if_delmulti_locked(ifp, ifma, 1);
730 IF_ADDR_UNLOCK(ifp);
731 }
732
733 /*
734 * Detach an interface, removing it from the
735 * list of "active" interfaces.
736 *
737 * XXXRW: There are some significant questions about event ordering, and
738 * how to prevent things from starting to use the interface during detach.
739 */
740 void
741 if_detach(struct ifnet *ifp)
742 {
743 struct ifaddr *ifa;
744 struct radix_node_head *rnh;
745 int s;
746 int i;
747 struct domain *dp;
748 struct ifnet *iter;
749 int found = 0;
750
751 IFNET_WLOCK();
752 TAILQ_FOREACH(iter, &ifnet, if_link)
753 if (iter == ifp) {
754 TAILQ_REMOVE(&ifnet, ifp, if_link);
755 found = 1;
756 break;
757 }
758 IFNET_WUNLOCK();
759 if (!found)
760 return;
761
762 /*
763 * Remove/wait for pending events.
764 */
765 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
766
767 /*
768 * Remove routes and flush queues.
769 */
770 s = splnet();
771 if_down(ifp);
772 #ifdef ALTQ
773 if (ALTQ_IS_ENABLED(&ifp->if_snd))
774 altq_disable(&ifp->if_snd);
775 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
776 altq_detach(&ifp->if_snd);
777 #endif
778
779 if_purgeaddrs(ifp);
780
781 #ifdef INET
782 in_ifdetach(ifp);
783 #endif
784
785 #ifdef INET6
786 /*
787 * Remove all IPv6 kernel structs related to ifp. This should be done
788 * before removing routing entries below, since IPv6 interface direct
789 * routes are expected to be removed by the IPv6-specific kernel API.
790 * Otherwise, the kernel will detect some inconsistency and bark it.
791 */
792 in6_ifdetach(ifp);
793 #endif
794 if_purgemaddrs(ifp);
795
796 /*
797 * Remove link ifaddr pointer and maybe decrement if_index.
798 * Clean up all addresses.
799 */
800 ifp->if_addr = NULL;
801 destroy_dev(ifdev_byindex(ifp->if_index));
802 ifdev_setbyindex(ifp->if_index, NULL);
803
804 /* We can now free link ifaddr. */
805 if (!TAILQ_EMPTY(&ifp->if_addrhead)) {
806 ifa = TAILQ_FIRST(&ifp->if_addrhead);
807 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
808 IFAFREE(ifa);
809 }
810
811 /*
812 * Delete all remaining routes using this interface
813 * Unfortuneatly the only way to do this is to slog through
814 * the entire routing table looking for routes which point
815 * to this interface...oh well...
816 */
817 for (i = 1; i <= AF_MAX; i++) {
818 int j;
819 for (j = 0; j < rt_numfibs; j++) {
820 if ((rnh = rt_tables[j][i]) == NULL)
821 continue;
822 RADIX_NODE_HEAD_LOCK(rnh);
823 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
824 RADIX_NODE_HEAD_UNLOCK(rnh);
825 }
826 }
827
828 /* Announce that the interface is gone. */
829 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
830 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
831 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
832 if_delgroups(ifp);
833
834 IF_AFDATA_LOCK(ifp);
835 for (dp = domains; dp; dp = dp->dom_next) {
836 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
837 (*dp->dom_ifdetach)(ifp,
838 ifp->if_afdata[dp->dom_family]);
839 }
840 IF_AFDATA_UNLOCK(ifp);
841
842 #ifdef MAC
843 mac_destroy_ifnet(ifp);
844 #endif /* MAC */
845 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT);
846 knlist_clear(&ifp->if_klist, 0);
847 knlist_destroy(&ifp->if_klist);
848 mtx_destroy(&ifp->if_snd.ifq_mtx);
849 IF_AFDATA_DESTROY(ifp);
850 splx(s);
851 }
852
853 /*
854 * Add a group to an interface
855 */
856 int
857 if_addgroup(struct ifnet *ifp, const char *groupname)
858 {
859 struct ifg_list *ifgl;
860 struct ifg_group *ifg = NULL;
861 struct ifg_member *ifgm;
862
863 if (groupname[0] && groupname[strlen(groupname) - 1] >= '' &&
864 groupname[strlen(groupname) - 1] <= '9')
865 return (EINVAL);
866
867 IFNET_WLOCK();
868 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
869 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
870 IFNET_WUNLOCK();
871 return (EEXIST);
872 }
873
874 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
875 M_NOWAIT)) == NULL) {
876 IFNET_WUNLOCK();
877 return (ENOMEM);
878 }
879
880 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
881 M_TEMP, M_NOWAIT)) == NULL) {
882 free(ifgl, M_TEMP);
883 IFNET_WUNLOCK();
884 return (ENOMEM);
885 }
886
887 TAILQ_FOREACH(ifg, &ifg_head, ifg_next)
888 if (!strcmp(ifg->ifg_group, groupname))
889 break;
890
891 if (ifg == NULL) {
892 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
893 M_TEMP, M_NOWAIT)) == NULL) {
894 free(ifgl, M_TEMP);
895 free(ifgm, M_TEMP);
896 IFNET_WUNLOCK();
897 return (ENOMEM);
898 }
899 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
900 ifg->ifg_refcnt = 0;
901 TAILQ_INIT(&ifg->ifg_members);
902 EVENTHANDLER_INVOKE(group_attach_event, ifg);
903 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next);
904 }
905
906 ifg->ifg_refcnt++;
907 ifgl->ifgl_group = ifg;
908 ifgm->ifgm_ifp = ifp;
909
910 IF_ADDR_LOCK(ifp);
911 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
912 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
913 IF_ADDR_UNLOCK(ifp);
914
915 IFNET_WUNLOCK();
916
917 EVENTHANDLER_INVOKE(group_change_event, groupname);
918
919 return (0);
920 }
921
922 /*
923 * Remove a group from an interface
924 */
925 int
926 if_delgroup(struct ifnet *ifp, const char *groupname)
927 {
928 struct ifg_list *ifgl;
929 struct ifg_member *ifgm;
930
931 IFNET_WLOCK();
932 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
933 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
934 break;
935 if (ifgl == NULL) {
936 IFNET_WUNLOCK();
937 return (ENOENT);
938 }
939
940 IF_ADDR_LOCK(ifp);
941 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
942 IF_ADDR_UNLOCK(ifp);
943
944 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
945 if (ifgm->ifgm_ifp == ifp)
946 break;
947
948 if (ifgm != NULL) {
949 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
950 free(ifgm, M_TEMP);
951 }
952
953 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
954 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next);
955 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
956 free(ifgl->ifgl_group, M_TEMP);
957 }
958 IFNET_WUNLOCK();
959
960 free(ifgl, M_TEMP);
961
962 EVENTHANDLER_INVOKE(group_change_event, groupname);
963
964 return (0);
965 }
966
967 /*
968 * Remove an interface from all groups
969 */
970 static void
971 if_delgroups(struct ifnet *ifp)
972 {
973 struct ifg_list *ifgl;
974 struct ifg_member *ifgm;
975 char groupname[IFNAMSIZ];
976
977 IFNET_WLOCK();
978 while (!TAILQ_EMPTY(&ifp->if_groups)) {
979 ifgl = TAILQ_FIRST(&ifp->if_groups);
980
981 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
982
983 IF_ADDR_LOCK(ifp);
984 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
985 IF_ADDR_UNLOCK(ifp);
986
987 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
988 if (ifgm->ifgm_ifp == ifp)
989 break;
990
991 if (ifgm != NULL) {
992 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
993 ifgm_next);
994 free(ifgm, M_TEMP);
995 }
996
997 if (--ifgl->ifgl_group->ifg_refcnt == 0) {
998 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next);
999 EVENTHANDLER_INVOKE(group_detach_event,
1000 ifgl->ifgl_group);
1001 free(ifgl->ifgl_group, M_TEMP);
1002 }
1003 IFNET_WUNLOCK();
1004
1005 free(ifgl, M_TEMP);
1006
1007 EVENTHANDLER_INVOKE(group_change_event, groupname);
1008
1009 IFNET_WLOCK();
1010 }
1011 IFNET_WUNLOCK();
1012 }
1013
1014 /*
1015 * Stores all groups from an interface in memory pointed
1016 * to by data
1017 */
1018 static int
1019 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp)
1020 {
1021 int len, error;
1022 struct ifg_list *ifgl;
1023 struct ifg_req ifgrq, *ifgp;
1024 struct ifgroupreq *ifgr = data;
1025
1026 if (ifgr->ifgr_len == 0) {
1027 IF_ADDR_LOCK(ifp);
1028 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1029 ifgr->ifgr_len += sizeof(struct ifg_req);
1030 IF_ADDR_UNLOCK(ifp);
1031 return (0);
1032 }
1033
1034 len = ifgr->ifgr_len;
1035 ifgp = ifgr->ifgr_groups;
1036 /* XXX: wire */
1037 IF_ADDR_LOCK(ifp);
1038 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1039 if (len < sizeof(ifgrq)) {
1040 IF_ADDR_UNLOCK(ifp);
1041 return (EINVAL);
1042 }
1043 bzero(&ifgrq, sizeof ifgrq);
1044 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1045 sizeof(ifgrq.ifgrq_group));
1046 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1047 IF_ADDR_UNLOCK(ifp);
1048 return (error);
1049 }
1050 len -= sizeof(ifgrq);
1051 ifgp++;
1052 }
1053 IF_ADDR_UNLOCK(ifp);
1054
1055 return (0);
1056 }
1057
1058 /*
1059 * Stores all members of a group in memory pointed to by data
1060 */
1061 static int
1062 if_getgroupmembers(struct ifgroupreq *data)
1063 {
1064 struct ifgroupreq *ifgr = data;
1065 struct ifg_group *ifg;
1066 struct ifg_member *ifgm;
1067 struct ifg_req ifgrq, *ifgp;
1068 int len, error;
1069
1070 IFNET_RLOCK();
1071 TAILQ_FOREACH(ifg, &ifg_head, ifg_next)
1072 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1073 break;
1074 if (ifg == NULL) {
1075 IFNET_RUNLOCK();
1076 return (ENOENT);
1077 }
1078
1079 if (ifgr->ifgr_len == 0) {
1080 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1081 ifgr->ifgr_len += sizeof(ifgrq);
1082 IFNET_RUNLOCK();
1083 return (0);
1084 }
1085
1086 len = ifgr->ifgr_len;
1087 ifgp = ifgr->ifgr_groups;
1088 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1089 if (len < sizeof(ifgrq)) {
1090 IFNET_RUNLOCK();
1091 return (EINVAL);
1092 }
1093 bzero(&ifgrq, sizeof ifgrq);
1094 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1095 sizeof(ifgrq.ifgrq_member));
1096 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1097 IFNET_RUNLOCK();
1098 return (error);
1099 }
1100 len -= sizeof(ifgrq);
1101 ifgp++;
1102 }
1103 IFNET_RUNLOCK();
1104
1105 return (0);
1106 }
1107
1108 /*
1109 * Delete Routes for a Network Interface
1110 *
1111 * Called for each routing entry via the rnh->rnh_walktree() call above
1112 * to delete all route entries referencing a detaching network interface.
1113 *
1114 * Arguments:
1115 * rn pointer to node in the routing table
1116 * arg argument passed to rnh->rnh_walktree() - detaching interface
1117 *
1118 * Returns:
1119 * 0 successful
1120 * errno failed - reason indicated
1121 *
1122 */
1123 static int
1124 if_rtdel(struct radix_node *rn, void *arg)
1125 {
1126 struct rtentry *rt = (struct rtentry *)rn;
1127 struct ifnet *ifp = arg;
1128 int err;
1129
1130 if (rt->rt_ifp == ifp) {
1131
1132 /*
1133 * Protect (sorta) against walktree recursion problems
1134 * with cloned routes
1135 */
1136 if ((rt->rt_flags & RTF_UP) == 0)
1137 return (0);
1138
1139 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1140 rt_mask(rt), rt->rt_flags,
1141 (struct rtentry **) NULL, rt->rt_fibnum);
1142 if (err) {
1143 log(LOG_WARNING, "if_rtdel: error %d\n", err);
1144 }
1145 }
1146
1147 return (0);
1148 }
1149
1150 /*
1151 * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1152 * structs used to represent other address families, it is necessary
1153 * to perform a different comparison.
1154 */
1155
1156 #define sa_equal(a1, a2) \
1157 (bcmp((a1), (a2), ((a1))->sa_len) == 0)
1158
1159 #define sa_dl_equal(a1, a2) \
1160 ((((struct sockaddr_dl *)(a1))->sdl_len == \
1161 ((struct sockaddr_dl *)(a2))->sdl_len) && \
1162 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
1163 LLADDR((struct sockaddr_dl *)(a2)), \
1164 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1165
1166 /*
1167 * Locate an interface based on a complete address.
1168 */
1169 /*ARGSUSED*/
1170 struct ifaddr *
1171 ifa_ifwithaddr(struct sockaddr *addr)
1172 {
1173 struct ifnet *ifp;
1174 struct ifaddr *ifa;
1175
1176 IFNET_RLOCK();
1177 TAILQ_FOREACH(ifp, &ifnet, if_link)
1178 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1179 if (ifa->ifa_addr->sa_family != addr->sa_family)
1180 continue;
1181 if (sa_equal(addr, ifa->ifa_addr))
1182 goto done;
1183 /* IP6 doesn't have broadcast */
1184 if ((ifp->if_flags & IFF_BROADCAST) &&
1185 ifa->ifa_broadaddr &&
1186 ifa->ifa_broadaddr->sa_len != 0 &&
1187 sa_equal(ifa->ifa_broadaddr, addr))
1188 goto done;
1189 }
1190 ifa = NULL;
1191 done:
1192 IFNET_RUNLOCK();
1193 return (ifa);
1194 }
1195
1196 /*
1197 * Locate an interface based on the broadcast address.
1198 */
1199 /* ARGSUSED */
1200 struct ifaddr *
1201 ifa_ifwithbroadaddr(struct sockaddr *addr)
1202 {
1203 struct ifnet *ifp;
1204 struct ifaddr *ifa;
1205
1206 IFNET_RLOCK();
1207 TAILQ_FOREACH(ifp, &ifnet, if_link)
1208 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1209 if (ifa->ifa_addr->sa_family != addr->sa_family)
1210 continue;
1211 if ((ifp->if_flags & IFF_BROADCAST) &&
1212 ifa->ifa_broadaddr &&
1213 ifa->ifa_broadaddr->sa_len != 0 &&
1214 sa_equal(ifa->ifa_broadaddr, addr))
1215 goto done;
1216 }
1217 ifa = NULL;
1218 done:
1219 IFNET_RUNLOCK();
1220 return (ifa);
1221 }
1222
1223 /*
1224 * Locate the point to point interface with a given destination address.
1225 */
1226 /*ARGSUSED*/
1227 struct ifaddr *
1228 ifa_ifwithdstaddr(struct sockaddr *addr)
1229 {
1230 struct ifnet *ifp;
1231 struct ifaddr *ifa;
1232
1233 IFNET_RLOCK();
1234 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1235 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1236 continue;
1237 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1238 if (ifa->ifa_addr->sa_family != addr->sa_family)
1239 continue;
1240 if (ifa->ifa_dstaddr != NULL &&
1241 sa_equal(addr, ifa->ifa_dstaddr))
1242 goto done;
1243 }
1244 }
1245 ifa = NULL;
1246 done:
1247 IFNET_RUNLOCK();
1248 return (ifa);
1249 }
1250
1251 /*
1252 * Find an interface on a specific network. If many, choice
1253 * is most specific found.
1254 */
1255 struct ifaddr *
1256 ifa_ifwithnet(struct sockaddr *addr)
1257 {
1258 struct ifnet *ifp;
1259 struct ifaddr *ifa;
1260 struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
1261 u_int af = addr->sa_family;
1262 char *addr_data = addr->sa_data, *cplim;
1263
1264 /*
1265 * AF_LINK addresses can be looked up directly by their index number,
1266 * so do that if we can.
1267 */
1268 if (af == AF_LINK) {
1269 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1270 if (sdl->sdl_index && sdl->sdl_index <= if_index)
1271 return (ifaddr_byindex(sdl->sdl_index));
1272 }
1273
1274 /*
1275 * Scan though each interface, looking for ones that have
1276 * addresses in this address family.
1277 */
1278 IFNET_RLOCK();
1279 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1280 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1281 char *cp, *cp2, *cp3;
1282
1283 if (ifa->ifa_addr->sa_family != af)
1284 next: continue;
1285 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
1286 /*
1287 * This is a bit broken as it doesn't
1288 * take into account that the remote end may
1289 * be a single node in the network we are
1290 * looking for.
1291 * The trouble is that we don't know the
1292 * netmask for the remote end.
1293 */
1294 if (ifa->ifa_dstaddr != NULL &&
1295 sa_equal(addr, ifa->ifa_dstaddr))
1296 goto done;
1297 } else {
1298 /*
1299 * if we have a special address handler,
1300 * then use it instead of the generic one.
1301 */
1302 if (ifa->ifa_claim_addr) {
1303 if ((*ifa->ifa_claim_addr)(ifa, addr))
1304 goto done;
1305 continue;
1306 }
1307
1308 /*
1309 * Scan all the bits in the ifa's address.
1310 * If a bit dissagrees with what we are
1311 * looking for, mask it with the netmask
1312 * to see if it really matters.
1313 * (A byte at a time)
1314 */
1315 if (ifa->ifa_netmask == 0)
1316 continue;
1317 cp = addr_data;
1318 cp2 = ifa->ifa_addr->sa_data;
1319 cp3 = ifa->ifa_netmask->sa_data;
1320 cplim = ifa->ifa_netmask->sa_len
1321 + (char *)ifa->ifa_netmask;
1322 while (cp3 < cplim)
1323 if ((*cp++ ^ *cp2++) & *cp3++)
1324 goto next; /* next address! */
1325 /*
1326 * If the netmask of what we just found
1327 * is more specific than what we had before
1328 * (if we had one) then remember the new one
1329 * before continuing to search
1330 * for an even better one.
1331 */
1332 if (ifa_maybe == 0 ||
1333 rn_refines((caddr_t)ifa->ifa_netmask,
1334 (caddr_t)ifa_maybe->ifa_netmask))
1335 ifa_maybe = ifa;
1336 }
1337 }
1338 }
1339 ifa = ifa_maybe;
1340 done:
1341 IFNET_RUNLOCK();
1342 return (ifa);
1343 }
1344
1345 /*
1346 * Find an interface address specific to an interface best matching
1347 * a given address.
1348 */
1349 struct ifaddr *
1350 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1351 {
1352 struct ifaddr *ifa;
1353 char *cp, *cp2, *cp3;
1354 char *cplim;
1355 struct ifaddr *ifa_maybe = 0;
1356 u_int af = addr->sa_family;
1357
1358 if (af >= AF_MAX)
1359 return (0);
1360 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1361 if (ifa->ifa_addr->sa_family != af)
1362 continue;
1363 if (ifa_maybe == 0)
1364 ifa_maybe = ifa;
1365 if (ifa->ifa_netmask == 0) {
1366 if (sa_equal(addr, ifa->ifa_addr) ||
1367 (ifa->ifa_dstaddr &&
1368 sa_equal(addr, ifa->ifa_dstaddr)))
1369 goto done;
1370 continue;
1371 }
1372 if (ifp->if_flags & IFF_POINTOPOINT) {
1373 if (sa_equal(addr, ifa->ifa_dstaddr))
1374 goto done;
1375 } else {
1376 cp = addr->sa_data;
1377 cp2 = ifa->ifa_addr->sa_data;
1378 cp3 = ifa->ifa_netmask->sa_data;
1379 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1380 for (; cp3 < cplim; cp3++)
1381 if ((*cp++ ^ *cp2++) & *cp3)
1382 break;
1383 if (cp3 == cplim)
1384 goto done;
1385 }
1386 }
1387 ifa = ifa_maybe;
1388 done:
1389 return (ifa);
1390 }
1391
1392 #include <net/route.h>
1393
1394 /*
1395 * Default action when installing a route with a Link Level gateway.
1396 * Lookup an appropriate real ifa to point to.
1397 * This should be moved to /sys/net/link.c eventually.
1398 */
1399 static void
1400 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
1401 {
1402 struct ifaddr *ifa, *oifa;
1403 struct sockaddr *dst;
1404 struct ifnet *ifp;
1405
1406 RT_LOCK_ASSERT(rt);
1407
1408 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
1409 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
1410 return;
1411 ifa = ifaof_ifpforaddr(dst, ifp);
1412 if (ifa) {
1413 IFAREF(ifa); /* XXX */
1414 oifa = rt->rt_ifa;
1415 rt->rt_ifa = ifa;
1416 IFAFREE(oifa);
1417 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
1418 ifa->ifa_rtrequest(cmd, rt, info);
1419 }
1420 }
1421
1422 /*
1423 * Mark an interface down and notify protocols of
1424 * the transition.
1425 * NOTE: must be called at splnet or eqivalent.
1426 */
1427 static void
1428 if_unroute(struct ifnet *ifp, int flag, int fam)
1429 {
1430 struct ifaddr *ifa;
1431
1432 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
1433
1434 ifp->if_flags &= ~flag;
1435 getmicrotime(&ifp->if_lastchange);
1436 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1437 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1438 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1439 if_qflush(&ifp->if_snd);
1440 #ifdef DEV_CARP
1441 if (ifp->if_carp)
1442 carp_carpdev_state(ifp->if_carp);
1443 #endif
1444 rt_ifmsg(ifp);
1445 }
1446
1447 /*
1448 * Mark an interface up and notify protocols of
1449 * the transition.
1450 * NOTE: must be called at splnet or eqivalent.
1451 */
1452 static void
1453 if_route(struct ifnet *ifp, int flag, int fam)
1454 {
1455 struct ifaddr *ifa;
1456
1457 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
1458
1459 ifp->if_flags |= flag;
1460 getmicrotime(&ifp->if_lastchange);
1461 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1462 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1463 pfctlinput(PRC_IFUP, ifa->ifa_addr);
1464 #ifdef DEV_CARP
1465 if (ifp->if_carp)
1466 carp_carpdev_state(ifp->if_carp);
1467 #endif
1468 rt_ifmsg(ifp);
1469 #ifdef INET6
1470 in6_if_up(ifp);
1471 #endif
1472 }
1473
1474 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */
1475 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */
1476
1477 /*
1478 * Handle a change in the interface link state. To avoid LORs
1479 * between driver lock and upper layer locks, as well as possible
1480 * recursions, we post event to taskqueue, and all job
1481 * is done in static do_link_state_change().
1482 */
1483 void
1484 if_link_state_change(struct ifnet *ifp, int link_state)
1485 {
1486 /* Return if state hasn't changed. */
1487 if (ifp->if_link_state == link_state)
1488 return;
1489
1490 ifp->if_link_state = link_state;
1491
1492 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
1493 }
1494
1495 static void
1496 do_link_state_change(void *arg, int pending)
1497 {
1498 struct ifnet *ifp = (struct ifnet *)arg;
1499 int link_state = ifp->if_link_state;
1500 int link;
1501
1502 /* Notify that the link state has changed. */
1503 rt_ifmsg(ifp);
1504 if (link_state == LINK_STATE_UP)
1505 link = NOTE_LINKUP;
1506 else if (link_state == LINK_STATE_DOWN)
1507 link = NOTE_LINKDOWN;
1508 else
1509 link = NOTE_LINKINV;
1510 KNOTE_UNLOCKED(&ifp->if_klist, link);
1511 if (ifp->if_vlantrunk != NULL)
1512 (*vlan_link_state_p)(ifp, link);
1513
1514 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
1515 IFP2AC(ifp)->ac_netgraph != NULL)
1516 (*ng_ether_link_state_p)(ifp, link_state);
1517 #ifdef DEV_CARP
1518 if (ifp->if_carp)
1519 carp_carpdev_state(ifp->if_carp);
1520 #endif
1521 if (ifp->if_bridge) {
1522 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!"));
1523 (*bstp_linkstate_p)(ifp, link_state);
1524 }
1525 if (ifp->if_lagg) {
1526 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!"));
1527 (*lagg_linkstate_p)(ifp, link_state);
1528 }
1529
1530 devctl_notify("IFNET", ifp->if_xname,
1531 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL);
1532 if (pending > 1)
1533 if_printf(ifp, "%d link states coalesced\n", pending);
1534 if (log_link_state_change)
1535 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname,
1536 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
1537 }
1538
1539 /*
1540 * Mark an interface down and notify protocols of
1541 * the transition.
1542 * NOTE: must be called at splnet or eqivalent.
1543 */
1544 void
1545 if_down(struct ifnet *ifp)
1546 {
1547
1548 if_unroute(ifp, IFF_UP, AF_UNSPEC);
1549 }
1550
1551 /*
1552 * Mark an interface up and notify protocols of
1553 * the transition.
1554 * NOTE: must be called at splnet or eqivalent.
1555 */
1556 void
1557 if_up(struct ifnet *ifp)
1558 {
1559
1560 if_route(ifp, IFF_UP, AF_UNSPEC);
1561 }
1562
1563 /*
1564 * Flush an interface queue.
1565 */
1566 static void
1567 if_qflush(struct ifaltq *ifq)
1568 {
1569 struct mbuf *m, *n;
1570
1571 IFQ_LOCK(ifq);
1572 #ifdef ALTQ
1573 if (ALTQ_IS_ENABLED(ifq))
1574 ALTQ_PURGE(ifq);
1575 #endif
1576 n = ifq->ifq_head;
1577 while ((m = n) != 0) {
1578 n = m->m_act;
1579 m_freem(m);
1580 }
1581 ifq->ifq_head = 0;
1582 ifq->ifq_tail = 0;
1583 ifq->ifq_len = 0;
1584 IFQ_UNLOCK(ifq);
1585 }
1586
1587 /*
1588 * Handle interface watchdog timer routines. Called
1589 * from softclock, we decrement timers (if set) and
1590 * call the appropriate interface routine on expiration.
1591 *
1592 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called
1593 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab
1594 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface.
1595 */
1596 static void
1597 if_slowtimo(void *arg)
1598 {
1599 struct ifnet *ifp;
1600 int s = splimp();
1601
1602 IFNET_RLOCK();
1603 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1604 if (ifp->if_timer == 0 || --ifp->if_timer)
1605 continue;
1606 if (ifp->if_watchdog)
1607 (*ifp->if_watchdog)(ifp);
1608 }
1609 IFNET_RUNLOCK();
1610 splx(s);
1611 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
1612 }
1613
1614 /*
1615 * Map interface name to
1616 * interface structure pointer.
1617 */
1618 struct ifnet *
1619 ifunit(const char *name)
1620 {
1621 struct ifnet *ifp;
1622
1623 IFNET_RLOCK();
1624 TAILQ_FOREACH(ifp, &ifnet, if_link) {
1625 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
1626 break;
1627 }
1628 IFNET_RUNLOCK();
1629 return (ifp);
1630 }
1631
1632 /*
1633 * Hardware specific interface ioctls.
1634 */
1635 static int
1636 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
1637 {
1638 struct ifreq *ifr;
1639 struct ifstat *ifs;
1640 int error = 0;
1641 int new_flags, temp_flags;
1642 size_t namelen, onamelen;
1643 char new_name[IFNAMSIZ];
1644 struct ifaddr *ifa;
1645 struct sockaddr_dl *sdl;
1646
1647 ifr = (struct ifreq *)data;
1648 switch (cmd) {
1649 case SIOCGIFINDEX:
1650 ifr->ifr_index = ifp->if_index;
1651 break;
1652
1653 case SIOCGIFFLAGS:
1654 temp_flags = ifp->if_flags | ifp->if_drv_flags;
1655 ifr->ifr_flags = temp_flags & 0xffff;
1656 ifr->ifr_flagshigh = temp_flags >> 16;
1657 break;
1658
1659 case SIOCGIFCAP:
1660 ifr->ifr_reqcap = ifp->if_capabilities;
1661 ifr->ifr_curcap = ifp->if_capenable;
1662 break;
1663
1664 #ifdef MAC
1665 case SIOCGIFMAC:
1666 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp);
1667 break;
1668 #endif
1669
1670 case SIOCGIFMETRIC:
1671 ifr->ifr_metric = ifp->if_metric;
1672 break;
1673
1674 case SIOCGIFMTU:
1675 ifr->ifr_mtu = ifp->if_mtu;
1676 break;
1677
1678 case SIOCGIFPHYS:
1679 ifr->ifr_phys = ifp->if_physical;
1680 break;
1681
1682 case SIOCSIFFLAGS:
1683 error = priv_check(td, PRIV_NET_SETIFFLAGS);
1684 if (error)
1685 return (error);
1686 /*
1687 * Currently, no driver owned flags pass the IFF_CANTCHANGE
1688 * check, so we don't need special handling here yet.
1689 */
1690 new_flags = (ifr->ifr_flags & 0xffff) |
1691 (ifr->ifr_flagshigh << 16);
1692 if (ifp->if_flags & IFF_SMART) {
1693 /* Smart drivers twiddle their own routes */
1694 } else if (ifp->if_flags & IFF_UP &&
1695 (new_flags & IFF_UP) == 0) {
1696 int s = splimp();
1697 if_down(ifp);
1698 splx(s);
1699 } else if (new_flags & IFF_UP &&
1700 (ifp->if_flags & IFF_UP) == 0) {
1701 int s = splimp();
1702 if_up(ifp);
1703 splx(s);
1704 }
1705 /* See if permanently promiscuous mode bit is about to flip */
1706 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
1707 if (new_flags & IFF_PPROMISC)
1708 ifp->if_flags |= IFF_PROMISC;
1709 else if (ifp->if_pcount == 0)
1710 ifp->if_flags &= ~IFF_PROMISC;
1711 log(LOG_INFO, "%s: permanently promiscuous mode %s\n",
1712 ifp->if_xname,
1713 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled");
1714 }
1715 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1716 (new_flags &~ IFF_CANTCHANGE);
1717 if (ifp->if_ioctl) {
1718 IFF_LOCKGIANT(ifp);
1719 (void) (*ifp->if_ioctl)(ifp, cmd, data);
1720 IFF_UNLOCKGIANT(ifp);
1721 }
1722 getmicrotime(&ifp->if_lastchange);
1723 break;
1724
1725 case SIOCSIFCAP:
1726 error = priv_check(td, PRIV_NET_SETIFCAP);
1727 if (error)
1728 return (error);
1729 if (ifp->if_ioctl == NULL)
1730 return (EOPNOTSUPP);
1731 if (ifr->ifr_reqcap & ~ifp->if_capabilities)
1732 return (EINVAL);
1733 IFF_LOCKGIANT(ifp);
1734 error = (*ifp->if_ioctl)(ifp, cmd, data);
1735 IFF_UNLOCKGIANT(ifp);
1736 if (error == 0)
1737 getmicrotime(&ifp->if_lastchange);
1738 break;
1739
1740 #ifdef MAC
1741 case SIOCSIFMAC:
1742 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp);
1743 break;
1744 #endif
1745
1746 case SIOCSIFNAME:
1747 error = priv_check(td, PRIV_NET_SETIFNAME);
1748 if (error)
1749 return (error);
1750 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1751 if (error != 0)
1752 return (error);
1753 if (new_name[0] == '\0')
1754 return (EINVAL);
1755 if (ifunit(new_name) != NULL)
1756 return (EEXIST);
1757
1758 /* Announce the departure of the interface. */
1759 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1760 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1761
1762 log(LOG_INFO, "%s: changing name to '%s'\n",
1763 ifp->if_xname, new_name);
1764
1765 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1766 ifa = ifp->if_addr;
1767 IFA_LOCK(ifa);
1768 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1769 namelen = strlen(new_name);
1770 onamelen = sdl->sdl_nlen;
1771 /*
1772 * Move the address if needed. This is safe because we
1773 * allocate space for a name of length IFNAMSIZ when we
1774 * create this in if_attach().
1775 */
1776 if (namelen != onamelen) {
1777 bcopy(sdl->sdl_data + onamelen,
1778 sdl->sdl_data + namelen, sdl->sdl_alen);
1779 }
1780 bcopy(new_name, sdl->sdl_data, namelen);
1781 sdl->sdl_nlen = namelen;
1782 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1783 bzero(sdl->sdl_data, onamelen);
1784 while (namelen != 0)
1785 sdl->sdl_data[--namelen] = 0xff;
1786 IFA_UNLOCK(ifa);
1787
1788 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
1789 /* Announce the return of the interface. */
1790 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1791 break;
1792
1793 case SIOCSIFMETRIC:
1794 error = priv_check(td, PRIV_NET_SETIFMETRIC);
1795 if (error)
1796 return (error);
1797 ifp->if_metric = ifr->ifr_metric;
1798 getmicrotime(&ifp->if_lastchange);
1799 break;
1800
1801 case SIOCSIFPHYS:
1802 error = priv_check(td, PRIV_NET_SETIFPHYS);
1803 if (error)
1804 return (error);
1805 if (ifp->if_ioctl == NULL)
1806 return (EOPNOTSUPP);
1807 IFF_LOCKGIANT(ifp);
1808 error = (*ifp->if_ioctl)(ifp, cmd, data);
1809 IFF_UNLOCKGIANT(ifp);
1810 if (error == 0)
1811 getmicrotime(&ifp->if_lastchange);
1812 break;
1813
1814 case SIOCSIFMTU:
1815 {
1816 u_long oldmtu = ifp->if_mtu;
1817
1818 error = priv_check(td, PRIV_NET_SETIFMTU);
1819 if (error)
1820 return (error);
1821 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1822 return (EINVAL);
1823 if (ifp->if_ioctl == NULL)
1824 return (EOPNOTSUPP);
1825 IFF_LOCKGIANT(ifp);
1826 error = (*ifp->if_ioctl)(ifp, cmd, data);
1827 IFF_UNLOCKGIANT(ifp);
1828 if (error == 0) {
1829 getmicrotime(&ifp->if_lastchange);
1830 rt_ifmsg(ifp);
1831 }
1832 /*
1833 * If the link MTU changed, do network layer specific procedure.
1834 */
1835 if (ifp->if_mtu != oldmtu) {
1836 #ifdef INET6
1837 nd6_setmtu(ifp);
1838 #endif
1839 }
1840 break;
1841 }
1842
1843 case SIOCADDMULTI:
1844 case SIOCDELMULTI:
1845 if (cmd == SIOCADDMULTI)
1846 error = priv_check(td, PRIV_NET_ADDMULTI);
1847 else
1848 error = priv_check(td, PRIV_NET_DELMULTI);
1849 if (error)
1850 return (error);
1851
1852 /* Don't allow group membership on non-multicast interfaces. */
1853 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1854 return (EOPNOTSUPP);
1855
1856 /* Don't let users screw up protocols' entries. */
1857 if (ifr->ifr_addr.sa_family != AF_LINK)
1858 return (EINVAL);
1859
1860 if (cmd == SIOCADDMULTI) {
1861 struct ifmultiaddr *ifma;
1862
1863 /*
1864 * Userland is only permitted to join groups once
1865 * via the if_addmulti() KPI, because it cannot hold
1866 * struct ifmultiaddr * between calls. It may also
1867 * lose a race while we check if the membership
1868 * already exists.
1869 */
1870 IF_ADDR_LOCK(ifp);
1871 ifma = if_findmulti(ifp, &ifr->ifr_addr);
1872 IF_ADDR_UNLOCK(ifp);
1873 if (ifma != NULL)
1874 error = EADDRINUSE;
1875 else
1876 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1877 } else {
1878 error = if_delmulti(ifp, &ifr->ifr_addr);
1879 }
1880 if (error == 0)
1881 getmicrotime(&ifp->if_lastchange);
1882 break;
1883
1884 case SIOCSIFPHYADDR:
1885 case SIOCDIFPHYADDR:
1886 #ifdef INET6
1887 case SIOCSIFPHYADDR_IN6:
1888 #endif
1889 case SIOCSLIFPHYADDR:
1890 case SIOCSIFMEDIA:
1891 case SIOCSIFGENERIC:
1892 error = priv_check(td, PRIV_NET_HWIOCTL);
1893 if (error)
1894 return (error);
1895 if (ifp->if_ioctl == NULL)
1896 return (EOPNOTSUPP);
1897 IFF_LOCKGIANT(ifp);
1898 error = (*ifp->if_ioctl)(ifp, cmd, data);
1899 IFF_UNLOCKGIANT(ifp);
1900 if (error == 0)
1901 getmicrotime(&ifp->if_lastchange);
1902 break;
1903
1904 case SIOCGIFSTATUS:
1905 ifs = (struct ifstat *)data;
1906 ifs->ascii[0] = '\0';
1907
1908 case SIOCGIFPSRCADDR:
1909 case SIOCGIFPDSTADDR:
1910 case SIOCGLIFPHYADDR:
1911 case SIOCGIFMEDIA:
1912 case SIOCGIFGENERIC:
1913 if (ifp->if_ioctl == NULL)
1914 return (EOPNOTSUPP);
1915 IFF_LOCKGIANT(ifp);
1916 error = (*ifp->if_ioctl)(ifp, cmd, data);
1917 IFF_UNLOCKGIANT(ifp);
1918 break;
1919
1920 case SIOCSIFLLADDR:
1921 error = priv_check(td, PRIV_NET_SETLLADDR);
1922 if (error)
1923 return (error);
1924 error = if_setlladdr(ifp,
1925 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1926 break;
1927
1928 case SIOCAIFGROUP:
1929 {
1930 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
1931
1932 error = priv_check(td, PRIV_NET_ADDIFGROUP);
1933 if (error)
1934 return (error);
1935 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
1936 return (error);
1937 break;
1938 }
1939
1940 case SIOCGIFGROUP:
1941 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
1942 return (error);
1943 break;
1944
1945 case SIOCDIFGROUP:
1946 {
1947 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
1948
1949 error = priv_check(td, PRIV_NET_DELIFGROUP);
1950 if (error)
1951 return (error);
1952 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
1953 return (error);
1954 break;
1955 }
1956
1957 default:
1958 error = ENOIOCTL;
1959 break;
1960 }
1961 return (error);
1962 }
1963
1964 /*
1965 * Interface ioctls.
1966 */
1967 int
1968 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
1969 {
1970 struct ifnet *ifp;
1971 struct ifreq *ifr;
1972 int error;
1973 int oif_flags;
1974
1975 switch (cmd) {
1976 case SIOCGIFCONF:
1977 case OSIOCGIFCONF:
1978 #ifdef __amd64__
1979 case SIOCGIFCONF32:
1980 #endif
1981 return (ifconf(cmd, data));
1982 }
1983 ifr = (struct ifreq *)data;
1984
1985 switch (cmd) {
1986 case SIOCIFCREATE:
1987 case SIOCIFCREATE2:
1988 error = priv_check(td, PRIV_NET_IFCREATE);
1989 if (error)
1990 return (error);
1991 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name),
1992 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL));
1993 case SIOCIFDESTROY:
1994 error = priv_check(td, PRIV_NET_IFDESTROY);
1995 if (error)
1996 return (error);
1997 return if_clone_destroy(ifr->ifr_name);
1998
1999 case SIOCIFGCLONERS:
2000 return (if_clone_list((struct if_clonereq *)data));
2001 case SIOCGIFGMEMB:
2002 return (if_getgroupmembers((struct ifgroupreq *)data));
2003 }
2004
2005 ifp = ifunit(ifr->ifr_name);
2006 if (ifp == 0)
2007 return (ENXIO);
2008
2009 error = ifhwioctl(cmd, ifp, data, td);
2010 if (error != ENOIOCTL)
2011 return (error);
2012
2013 oif_flags = ifp->if_flags;
2014 if (so->so_proto == 0)
2015 return (EOPNOTSUPP);
2016 #ifndef COMPAT_43
2017 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2018 data,
2019 ifp, td));
2020 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL)
2021 error = (*ifp->if_ioctl)(ifp, cmd, data);
2022 #else
2023 {
2024 int ocmd = cmd;
2025
2026 switch (cmd) {
2027
2028 case SIOCSIFDSTADDR:
2029 case SIOCSIFADDR:
2030 case SIOCSIFBRDADDR:
2031 case SIOCSIFNETMASK:
2032 #if BYTE_ORDER != BIG_ENDIAN
2033 if (ifr->ifr_addr.sa_family == 0 &&
2034 ifr->ifr_addr.sa_len < 16) {
2035 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2036 ifr->ifr_addr.sa_len = 16;
2037 }
2038 #else
2039 if (ifr->ifr_addr.sa_len == 0)
2040 ifr->ifr_addr.sa_len = 16;
2041 #endif
2042 break;
2043
2044 case OSIOCGIFADDR:
2045 cmd = SIOCGIFADDR;
2046 break;
2047
2048 case OSIOCGIFDSTADDR:
2049 cmd = SIOCGIFDSTADDR;
2050 break;
2051
2052 case OSIOCGIFBRDADDR:
2053 cmd = SIOCGIFBRDADDR;
2054 break;
2055
2056 case OSIOCGIFNETMASK:
2057 cmd = SIOCGIFNETMASK;
2058 }
2059 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2060 cmd,
2061 data,
2062 ifp, td));
2063 if (error == EOPNOTSUPP && ifp != NULL &&
2064 ifp->if_ioctl != NULL)
2065 error = (*ifp->if_ioctl)(ifp, cmd, data);
2066 switch (ocmd) {
2067
2068 case OSIOCGIFADDR:
2069 case OSIOCGIFDSTADDR:
2070 case OSIOCGIFBRDADDR:
2071 case OSIOCGIFNETMASK:
2072 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2073
2074 }
2075 }
2076 #endif /* COMPAT_43 */
2077
2078 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2079 #ifdef INET6
2080 DELAY(100);/* XXX: temporary workaround for fxp issue*/
2081 if (ifp->if_flags & IFF_UP) {
2082 int s = splimp();
2083 in6_if_up(ifp);
2084 splx(s);
2085 }
2086 #endif
2087 }
2088 return (error);
2089 }
2090
2091 /*
2092 * The code common to handling reference counted flags,
2093 * e.g., in ifpromisc() and if_allmulti().
2094 * The "pflag" argument can specify a permanent mode flag to check,
2095 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2096 *
2097 * Only to be used on stack-owned flags, not driver-owned flags.
2098 */
2099 static int
2100 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2101 {
2102 struct ifreq ifr;
2103 int error;
2104 int oldflags, oldcount;
2105
2106 /* Sanity checks to catch programming errors */
2107 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2108 ("%s: setting driver-owned flag %d", __func__, flag));
2109
2110 if (onswitch)
2111 KASSERT(*refcount >= 0,
2112 ("%s: increment negative refcount %d for flag %d",
2113 __func__, *refcount, flag));
2114 else
2115 KASSERT(*refcount > 0,
2116 ("%s: decrement non-positive refcount %d for flag %d",
2117 __func__, *refcount, flag));
2118
2119 /* In case this mode is permanent, just touch refcount */
2120 if (ifp->if_flags & pflag) {
2121 *refcount += onswitch ? 1 : -1;
2122 return (0);
2123 }
2124
2125 /* Save ifnet parameters for if_ioctl() may fail */
2126 oldcount = *refcount;
2127 oldflags = ifp->if_flags;
2128
2129 /*
2130 * See if we aren't the only and touching refcount is enough.
2131 * Actually toggle interface flag if we are the first or last.
2132 */
2133 if (onswitch) {
2134 if ((*refcount)++)
2135 return (0);
2136 ifp->if_flags |= flag;
2137 } else {
2138 if (--(*refcount))
2139 return (0);
2140 ifp->if_flags &= ~flag;
2141 }
2142
2143 /* Call down the driver since we've changed interface flags */
2144 if (ifp->if_ioctl == NULL) {
2145 error = EOPNOTSUPP;
2146 goto recover;
2147 }
2148 ifr.ifr_flags = ifp->if_flags & 0xffff;
2149 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2150 IFF_LOCKGIANT(ifp);
2151 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2152 IFF_UNLOCKGIANT(ifp);
2153 if (error)
2154 goto recover;
2155 /* Notify userland that interface flags have changed */
2156 rt_ifmsg(ifp);
2157 return (0);
2158
2159 recover:
2160 /* Recover after driver error */
2161 *refcount = oldcount;
2162 ifp->if_flags = oldflags;
2163 return (error);
2164 }
2165
2166 /*
2167 * Set/clear promiscuous mode on interface ifp based on the truth value
2168 * of pswitch. The calls are reference counted so that only the first
2169 * "on" request actually has an effect, as does the final "off" request.
2170 * Results are undefined if the "off" and "on" requests are not matched.
2171 */
2172 int
2173 ifpromisc(struct ifnet *ifp, int pswitch)
2174 {
2175 int error;
2176 int oldflags = ifp->if_flags;
2177
2178 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2179 &ifp->if_pcount, pswitch);
2180 /* If promiscuous mode status has changed, log a message */
2181 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2182 log(LOG_INFO, "%s: promiscuous mode %s\n",
2183 ifp->if_xname,
2184 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2185 return (error);
2186 }
2187
2188 /*
2189 * Return interface configuration
2190 * of system. List may be used
2191 * in later ioctl's (above) to get
2192 * other information.
2193 */
2194 /*ARGSUSED*/
2195 static int
2196 ifconf(u_long cmd, caddr_t data)
2197 {
2198 struct ifconf *ifc = (struct ifconf *)data;
2199 #ifdef __amd64__
2200 struct ifconf32 *ifc32 = (struct ifconf32 *)data;
2201 struct ifconf ifc_swab;
2202 #endif
2203 struct ifnet *ifp;
2204 struct ifaddr *ifa;
2205 struct ifreq ifr;
2206 struct sbuf *sb;
2207 int error, full = 0, valid_len, max_len;
2208
2209 #ifdef __amd64__
2210 if (cmd == SIOCGIFCONF32) {
2211 ifc_swab.ifc_len = ifc32->ifc_len;
2212 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf;
2213 ifc = &ifc_swab;
2214 }
2215 #endif
2216 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2217 max_len = MAXPHYS - 1;
2218
2219 /* Prevent hostile input from being able to crash the system */
2220 if (ifc->ifc_len <= 0)
2221 return (EINVAL);
2222
2223 again:
2224 if (ifc->ifc_len <= max_len) {
2225 max_len = ifc->ifc_len;
2226 full = 1;
2227 }
2228 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2229 max_len = 0;
2230 valid_len = 0;
2231
2232 IFNET_RLOCK(); /* could sleep XXX */
2233 TAILQ_FOREACH(ifp, &ifnet, if_link) {
2234 int addrs;
2235
2236 /*
2237 * Zero the ifr_name buffer to make sure we don't
2238 * disclose the contents of the stack.
2239 */
2240 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2241
2242 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2243 >= sizeof(ifr.ifr_name)) {
2244 sbuf_delete(sb);
2245 IFNET_RUNLOCK();
2246 return (ENAMETOOLONG);
2247 }
2248
2249 addrs = 0;
2250 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2251 struct sockaddr *sa = ifa->ifa_addr;
2252
2253 if (prison_if(curthread->td_ucred, sa) != 0)
2254 continue;
2255 addrs++;
2256 #ifdef COMPAT_43
2257 if (cmd == OSIOCGIFCONF) {
2258 struct osockaddr *osa =
2259 (struct osockaddr *)&ifr.ifr_addr;
2260 ifr.ifr_addr = *sa;
2261 osa->sa_family = sa->sa_family;
2262 sbuf_bcat(sb, &ifr, sizeof(ifr));
2263 max_len += sizeof(ifr);
2264 } else
2265 #endif
2266 if (sa->sa_len <= sizeof(*sa)) {
2267 ifr.ifr_addr = *sa;
2268 sbuf_bcat(sb, &ifr, sizeof(ifr));
2269 max_len += sizeof(ifr);
2270 } else {
2271 sbuf_bcat(sb, &ifr,
2272 offsetof(struct ifreq, ifr_addr));
2273 max_len += offsetof(struct ifreq, ifr_addr);
2274 sbuf_bcat(sb, sa, sa->sa_len);
2275 max_len += sa->sa_len;
2276 }
2277
2278 if (!sbuf_overflowed(sb))
2279 valid_len = sbuf_len(sb);
2280 }
2281 if (addrs == 0) {
2282 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
2283 sbuf_bcat(sb, &ifr, sizeof(ifr));
2284 max_len += sizeof(ifr);
2285
2286 if (!sbuf_overflowed(sb))
2287 valid_len = sbuf_len(sb);
2288 }
2289 }
2290 IFNET_RUNLOCK();
2291
2292 /*
2293 * If we didn't allocate enough space (uncommon), try again. If
2294 * we have already allocated as much space as we are allowed,
2295 * return what we've got.
2296 */
2297 if (valid_len != max_len && !full) {
2298 sbuf_delete(sb);
2299 goto again;
2300 }
2301
2302 ifc->ifc_len = valid_len;
2303 #ifdef __amd64__
2304 if (cmd == SIOCGIFCONF32)
2305 ifc32->ifc_len = valid_len;
2306 #endif
2307 sbuf_finish(sb);
2308 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
2309 sbuf_delete(sb);
2310 return (error);
2311 }
2312
2313 /*
2314 * Just like ifpromisc(), but for all-multicast-reception mode.
2315 */
2316 int
2317 if_allmulti(struct ifnet *ifp, int onswitch)
2318 {
2319
2320 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
2321 }
2322
2323 struct ifmultiaddr *
2324 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
2325 {
2326 struct ifmultiaddr *ifma;
2327
2328 IF_ADDR_LOCK_ASSERT(ifp);
2329
2330 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2331 if (sa->sa_family == AF_LINK) {
2332 if (sa_dl_equal(ifma->ifma_addr, sa))
2333 break;
2334 } else {
2335 if (sa_equal(ifma->ifma_addr, sa))
2336 break;
2337 }
2338 }
2339
2340 return ifma;
2341 }
2342
2343 /*
2344 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
2345 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
2346 * the ifnet multicast address list here, so the caller must do that and
2347 * other setup work (such as notifying the device driver). The reference
2348 * count is initialized to 1.
2349 */
2350 static struct ifmultiaddr *
2351 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
2352 int mflags)
2353 {
2354 struct ifmultiaddr *ifma;
2355 struct sockaddr *dupsa;
2356
2357 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags |
2358 M_ZERO);
2359 if (ifma == NULL)
2360 return (NULL);
2361
2362 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags);
2363 if (dupsa == NULL) {
2364 FREE(ifma, M_IFMADDR);
2365 return (NULL);
2366 }
2367 bcopy(sa, dupsa, sa->sa_len);
2368 ifma->ifma_addr = dupsa;
2369
2370 ifma->ifma_ifp = ifp;
2371 ifma->ifma_refcount = 1;
2372 ifma->ifma_protospec = NULL;
2373
2374 if (llsa == NULL) {
2375 ifma->ifma_lladdr = NULL;
2376 return (ifma);
2377 }
2378
2379 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags);
2380 if (dupsa == NULL) {
2381 FREE(ifma->ifma_addr, M_IFMADDR);
2382 FREE(ifma, M_IFMADDR);
2383 return (NULL);
2384 }
2385 bcopy(llsa, dupsa, llsa->sa_len);
2386 ifma->ifma_lladdr = dupsa;
2387
2388 return (ifma);
2389 }
2390
2391 /*
2392 * if_freemulti: free ifmultiaddr structure and possibly attached related
2393 * addresses. The caller is responsible for implementing reference
2394 * counting, notifying the driver, handling routing messages, and releasing
2395 * any dependent link layer state.
2396 */
2397 static void
2398 if_freemulti(struct ifmultiaddr *ifma)
2399 {
2400
2401 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
2402 ifma->ifma_refcount));
2403 KASSERT(ifma->ifma_protospec == NULL,
2404 ("if_freemulti: protospec not NULL"));
2405
2406 if (ifma->ifma_lladdr != NULL)
2407 FREE(ifma->ifma_lladdr, M_IFMADDR);
2408 FREE(ifma->ifma_addr, M_IFMADDR);
2409 FREE(ifma, M_IFMADDR);
2410 }
2411
2412 /*
2413 * Register an additional multicast address with a network interface.
2414 *
2415 * - If the address is already present, bump the reference count on the
2416 * address and return.
2417 * - If the address is not link-layer, look up a link layer address.
2418 * - Allocate address structures for one or both addresses, and attach to the
2419 * multicast address list on the interface. If automatically adding a link
2420 * layer address, the protocol address will own a reference to the link
2421 * layer address, to be freed when it is freed.
2422 * - Notify the network device driver of an addition to the multicast address
2423 * list.
2424 *
2425 * 'sa' points to caller-owned memory with the desired multicast address.
2426 *
2427 * 'retifma' will be used to return a pointer to the resulting multicast
2428 * address reference, if desired.
2429 */
2430 int
2431 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
2432 struct ifmultiaddr **retifma)
2433 {
2434 struct ifmultiaddr *ifma, *ll_ifma;
2435 struct sockaddr *llsa;
2436 int error;
2437
2438 /*
2439 * If the address is already present, return a new reference to it;
2440 * otherwise, allocate storage and set up a new address.
2441 */
2442 IF_ADDR_LOCK(ifp);
2443 ifma = if_findmulti(ifp, sa);
2444 if (ifma != NULL) {
2445 ifma->ifma_refcount++;
2446 if (retifma != NULL)
2447 *retifma = ifma;
2448 IF_ADDR_UNLOCK(ifp);
2449 return (0);
2450 }
2451
2452 /*
2453 * The address isn't already present; resolve the protocol address
2454 * into a link layer address, and then look that up, bump its
2455 * refcount or allocate an ifma for that also. If 'llsa' was
2456 * returned, we will need to free it later.
2457 */
2458 llsa = NULL;
2459 ll_ifma = NULL;
2460 if (ifp->if_resolvemulti != NULL) {
2461 error = ifp->if_resolvemulti(ifp, &llsa, sa);
2462 if (error)
2463 goto unlock_out;
2464 }
2465
2466 /*
2467 * Allocate the new address. Don't hook it up yet, as we may also
2468 * need to allocate a link layer multicast address.
2469 */
2470 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
2471 if (ifma == NULL) {
2472 error = ENOMEM;
2473 goto free_llsa_out;
2474 }
2475
2476 /*
2477 * If a link layer address is found, we'll need to see if it's
2478 * already present in the address list, or allocate is as well.
2479 * When this block finishes, the link layer address will be on the
2480 * list.
2481 */
2482 if (llsa != NULL) {
2483 ll_ifma = if_findmulti(ifp, llsa);
2484 if (ll_ifma == NULL) {
2485 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
2486 if (ll_ifma == NULL) {
2487 --ifma->ifma_refcount;
2488 if_freemulti(ifma);
2489 error = ENOMEM;
2490 goto free_llsa_out;
2491 }
2492 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
2493 ifma_link);
2494 } else
2495 ll_ifma->ifma_refcount++;
2496 ifma->ifma_llifma = ll_ifma;
2497 }
2498
2499 /*
2500 * We now have a new multicast address, ifma, and possibly a new or
2501 * referenced link layer address. Add the primary address to the
2502 * ifnet address list.
2503 */
2504 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
2505
2506 if (retifma != NULL)
2507 *retifma = ifma;
2508
2509 /*
2510 * Must generate the message while holding the lock so that 'ifma'
2511 * pointer is still valid.
2512 */
2513 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
2514 IF_ADDR_UNLOCK(ifp);
2515
2516 /*
2517 * We are certain we have added something, so call down to the
2518 * interface to let them know about it.
2519 */
2520 if (ifp->if_ioctl != NULL) {
2521 IFF_LOCKGIANT(ifp);
2522 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
2523 IFF_UNLOCKGIANT(ifp);
2524 }
2525
2526 if (llsa != NULL)
2527 FREE(llsa, M_IFMADDR);
2528
2529 return (0);
2530
2531 free_llsa_out:
2532 if (llsa != NULL)
2533 FREE(llsa, M_IFMADDR);
2534
2535 unlock_out:
2536 IF_ADDR_UNLOCK(ifp);
2537 return (error);
2538 }
2539
2540 /*
2541 * Delete a multicast group membership by network-layer group address.
2542 *
2543 * Returns ENOENT if the entry could not be found. If ifp no longer
2544 * exists, results are undefined. This entry point should only be used
2545 * from subsystems which do appropriate locking to hold ifp for the
2546 * duration of the call.
2547 * Network-layer protocol domains must use if_delmulti_ifma().
2548 */
2549 int
2550 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
2551 {
2552 struct ifmultiaddr *ifma;
2553 int lastref;
2554 #ifdef INVARIANTS
2555 struct ifnet *oifp;
2556
2557 IFNET_RLOCK();
2558 TAILQ_FOREACH(oifp, &ifnet, if_link)
2559 if (ifp == oifp)
2560 break;
2561 if (ifp != oifp)
2562 ifp = NULL;
2563 IFNET_RUNLOCK();
2564
2565 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
2566 #endif
2567 if (ifp == NULL)
2568 return (ENOENT);
2569
2570 IF_ADDR_LOCK(ifp);
2571 lastref = 0;
2572 ifma = if_findmulti(ifp, sa);
2573 if (ifma != NULL)
2574 lastref = if_delmulti_locked(ifp, ifma, 0);
2575 IF_ADDR_UNLOCK(ifp);
2576
2577 if (ifma == NULL)
2578 return (ENOENT);
2579
2580 if (lastref && ifp->if_ioctl != NULL) {
2581 IFF_LOCKGIANT(ifp);
2582 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
2583 IFF_UNLOCKGIANT(ifp);
2584 }
2585
2586 return (0);
2587 }
2588
2589 /*
2590 * Delete a multicast group membership by group membership pointer.
2591 * Network-layer protocol domains must use this routine.
2592 *
2593 * It is safe to call this routine if the ifp disappeared. Callers should
2594 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be
2595 * reconfigured.
2596 */
2597 void
2598 if_delmulti_ifma(struct ifmultiaddr *ifma)
2599 {
2600 struct ifnet *ifp;
2601 int lastref;
2602
2603 ifp = ifma->ifma_ifp;
2604 #ifdef DIAGNOSTIC
2605 if (ifp == NULL) {
2606 printf("%s: ifma_ifp seems to be detached\n", __func__);
2607 } else {
2608 struct ifnet *oifp;
2609
2610 IFNET_RLOCK();
2611 TAILQ_FOREACH(oifp, &ifnet, if_link)
2612 if (ifp == oifp)
2613 break;
2614 if (ifp != oifp) {
2615 printf("%s: ifnet %p disappeared\n", __func__, ifp);
2616 ifp = NULL;
2617 }
2618 IFNET_RUNLOCK();
2619 }
2620 #endif
2621 /*
2622 * If and only if the ifnet instance exists: Acquire the address lock.
2623 */
2624 if (ifp != NULL)
2625 IF_ADDR_LOCK(ifp);
2626
2627 lastref = if_delmulti_locked(ifp, ifma, 0);
2628
2629 if (ifp != NULL) {
2630 /*
2631 * If and only if the ifnet instance exists:
2632 * Release the address lock.
2633 * If the group was left: update the hardware hash filter.
2634 */
2635 IF_ADDR_UNLOCK(ifp);
2636 if (lastref && ifp->if_ioctl != NULL) {
2637 IFF_LOCKGIANT(ifp);
2638 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
2639 IFF_UNLOCKGIANT(ifp);
2640 }
2641 }
2642 }
2643
2644 /*
2645 * Perform deletion of network-layer and/or link-layer multicast address.
2646 *
2647 * Return 0 if the reference count was decremented.
2648 * Return 1 if the final reference was released, indicating that the
2649 * hardware hash filter should be reprogrammed.
2650 */
2651 static int
2652 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
2653 {
2654 struct ifmultiaddr *ll_ifma;
2655
2656 if (ifp != NULL && ifma->ifma_ifp != NULL) {
2657 KASSERT(ifma->ifma_ifp == ifp,
2658 ("%s: inconsistent ifp %p", __func__, ifp));
2659 IF_ADDR_LOCK_ASSERT(ifp);
2660 }
2661
2662 ifp = ifma->ifma_ifp;
2663
2664 /*
2665 * If the ifnet is detaching, null out references to ifnet,
2666 * so that upper protocol layers will notice, and not attempt
2667 * to obtain locks for an ifnet which no longer exists. The
2668 * routing socket announcement must happen before the ifnet
2669 * instance is detached from the system.
2670 */
2671 if (detaching) {
2672 #ifdef DIAGNOSTIC
2673 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
2674 #endif
2675 /*
2676 * ifp may already be nulled out if we are being reentered
2677 * to delete the ll_ifma.
2678 */
2679 if (ifp != NULL) {
2680 rt_newmaddrmsg(RTM_DELMADDR, ifma);
2681 ifma->ifma_ifp = NULL;
2682 }
2683 }
2684
2685 if (--ifma->ifma_refcount > 0)
2686 return 0;
2687
2688 /*
2689 * If this ifma is a network-layer ifma, a link-layer ifma may
2690 * have been associated with it. Release it first if so.
2691 */
2692 ll_ifma = ifma->ifma_llifma;
2693 if (ll_ifma != NULL) {
2694 KASSERT(ifma->ifma_lladdr != NULL,
2695 ("%s: llifma w/o lladdr", __func__));
2696 if (detaching)
2697 ll_ifma->ifma_ifp = NULL; /* XXX */
2698 if (--ll_ifma->ifma_refcount == 0) {
2699 if (ifp != NULL) {
2700 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
2701 ifma_link);
2702 }
2703 if_freemulti(ll_ifma);
2704 }
2705 }
2706
2707 if (ifp != NULL)
2708 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
2709
2710 if_freemulti(ifma);
2711
2712 /*
2713 * The last reference to this instance of struct ifmultiaddr
2714 * was released; the hardware should be notified of this change.
2715 */
2716 return 1;
2717 }
2718
2719 /*
2720 * Set the link layer address on an interface.
2721 *
2722 * At this time we only support certain types of interfaces,
2723 * and we don't allow the length of the address to change.
2724 */
2725 int
2726 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
2727 {
2728 struct sockaddr_dl *sdl;
2729 struct ifaddr *ifa;
2730 struct ifreq ifr;
2731
2732 ifa = ifp->if_addr;
2733 if (ifa == NULL)
2734 return (EINVAL);
2735 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2736 if (sdl == NULL)
2737 return (EINVAL);
2738 if (len != sdl->sdl_alen) /* don't allow length to change */
2739 return (EINVAL);
2740 switch (ifp->if_type) {
2741 case IFT_ETHER:
2742 case IFT_FDDI:
2743 case IFT_XETHER:
2744 case IFT_ISO88025:
2745 case IFT_L2VLAN:
2746 case IFT_BRIDGE:
2747 case IFT_ARCNET:
2748 case IFT_IEEE8023ADLAG:
2749 bcopy(lladdr, LLADDR(sdl), len);
2750 break;
2751 default:
2752 return (ENODEV);
2753 }
2754 /*
2755 * If the interface is already up, we need
2756 * to re-init it in order to reprogram its
2757 * address filter.
2758 */
2759 if ((ifp->if_flags & IFF_UP) != 0) {
2760 if (ifp->if_ioctl) {
2761 IFF_LOCKGIANT(ifp);
2762 ifp->if_flags &= ~IFF_UP;
2763 ifr.ifr_flags = ifp->if_flags & 0xffff;
2764 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2765 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2766 ifp->if_flags |= IFF_UP;
2767 ifr.ifr_flags = ifp->if_flags & 0xffff;
2768 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2769 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2770 IFF_UNLOCKGIANT(ifp);
2771 }
2772 #ifdef INET
2773 /*
2774 * Also send gratuitous ARPs to notify other nodes about
2775 * the address change.
2776 */
2777 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2778 if (ifa->ifa_addr->sa_family == AF_INET)
2779 arp_ifinit(ifp, ifa);
2780 }
2781 #endif
2782 }
2783 return (0);
2784 }
2785
2786 /*
2787 * The name argument must be a pointer to storage which will last as
2788 * long as the interface does. For physical devices, the result of
2789 * device_get_name(dev) is a good choice and for pseudo-devices a
2790 * static string works well.
2791 */
2792 void
2793 if_initname(struct ifnet *ifp, const char *name, int unit)
2794 {
2795 ifp->if_dname = name;
2796 ifp->if_dunit = unit;
2797 if (unit != IF_DUNIT_NONE)
2798 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
2799 else
2800 strlcpy(ifp->if_xname, name, IFNAMSIZ);
2801 }
2802
2803 int
2804 if_printf(struct ifnet *ifp, const char * fmt, ...)
2805 {
2806 va_list ap;
2807 int retval;
2808
2809 retval = printf("%s: ", ifp->if_xname);
2810 va_start(ap, fmt);
2811 retval += vprintf(fmt, ap);
2812 va_end(ap);
2813 return (retval);
2814 }
2815
2816 /*
2817 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot
2818 * be called without Giant. However, we often can't acquire the Giant lock
2819 * at those points; instead, we run it via a task queue that holds Giant via
2820 * if_start_deferred.
2821 *
2822 * XXXRW: We need to make sure that the ifnet isn't fully detached until any
2823 * outstanding if_start_deferred() tasks that will run after the free. This
2824 * probably means waiting in if_detach().
2825 */
2826 void
2827 if_start(struct ifnet *ifp)
2828 {
2829
2830 if (ifp->if_flags & IFF_NEEDSGIANT) {
2831 if (mtx_owned(&Giant))
2832 (*(ifp)->if_start)(ifp);
2833 else
2834 taskqueue_enqueue(taskqueue_swi_giant,
2835 &ifp->if_starttask);
2836 } else
2837 (*(ifp)->if_start)(ifp);
2838 }
2839
2840 static void
2841 if_start_deferred(void *context, int pending)
2842 {
2843 struct ifnet *ifp;
2844
2845 GIANT_REQUIRED;
2846
2847 ifp = context;
2848 (ifp->if_start)(ifp);
2849 }
2850
2851 int
2852 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
2853 {
2854 int active = 0;
2855
2856 IF_LOCK(ifq);
2857 if (_IF_QFULL(ifq)) {
2858 _IF_DROP(ifq);
2859 IF_UNLOCK(ifq);
2860 m_freem(m);
2861 return (0);
2862 }
2863 if (ifp != NULL) {
2864 ifp->if_obytes += m->m_pkthdr.len + adjust;
2865 if (m->m_flags & (M_BCAST|M_MCAST))
2866 ifp->if_omcasts++;
2867 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
2868 }
2869 _IF_ENQUEUE(ifq, m);
2870 IF_UNLOCK(ifq);
2871 if (ifp != NULL && !active)
2872 if_start(ifp);
2873 return (1);
2874 }
2875
2876 void
2877 if_register_com_alloc(u_char type,
2878 if_com_alloc_t *a, if_com_free_t *f)
2879 {
2880
2881 KASSERT(if_com_alloc[type] == NULL,
2882 ("if_register_com_alloc: %d already registered", type));
2883 KASSERT(if_com_free[type] == NULL,
2884 ("if_register_com_alloc: %d free already registered", type));
2885
2886 if_com_alloc[type] = a;
2887 if_com_free[type] = f;
2888 }
2889
2890 void
2891 if_deregister_com_alloc(u_char type)
2892 {
2893
2894 KASSERT(if_com_alloc[type] != NULL,
2895 ("if_deregister_com_alloc: %d not registered", type));
2896 KASSERT(if_com_free[type] != NULL,
2897 ("if_deregister_com_alloc: %d free not registered", type));
2898 if_com_alloc[type] = NULL;
2899 if_com_free[type] = NULL;
2900 }
Cache object: 8e2a950867f637e6b93c32498e0da772
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