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/7.3/sys/net/if.c 201599 2010-01-05 18:26:41Z jhb $
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 /*
1759 * XXX: Locking. Nothing else seems to lock if_flags,
1760 * and there are numerous other races with the
1761 * ifunit() checks not being atomic with namespace
1762 * changes (renames, vmoves, if_attach, etc).
1763 */
1764 ifp->if_flags |= IFF_RENAMING;
1765
1766 /* Announce the departure of the interface. */
1767 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1768 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1769
1770 log(LOG_INFO, "%s: changing name to '%s'\n",
1771 ifp->if_xname, new_name);
1772
1773 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1774 ifa = ifp->if_addr;
1775 IFA_LOCK(ifa);
1776 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1777 namelen = strlen(new_name);
1778 onamelen = sdl->sdl_nlen;
1779 /*
1780 * Move the address if needed. This is safe because we
1781 * allocate space for a name of length IFNAMSIZ when we
1782 * create this in if_attach().
1783 */
1784 if (namelen != onamelen) {
1785 bcopy(sdl->sdl_data + onamelen,
1786 sdl->sdl_data + namelen, sdl->sdl_alen);
1787 }
1788 bcopy(new_name, sdl->sdl_data, namelen);
1789 sdl->sdl_nlen = namelen;
1790 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1791 bzero(sdl->sdl_data, onamelen);
1792 while (namelen != 0)
1793 sdl->sdl_data[--namelen] = 0xff;
1794 IFA_UNLOCK(ifa);
1795
1796 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
1797 /* Announce the return of the interface. */
1798 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1799
1800 ifp->if_flags &= ~IFF_RENAMING;
1801 break;
1802
1803 case SIOCSIFMETRIC:
1804 error = priv_check(td, PRIV_NET_SETIFMETRIC);
1805 if (error)
1806 return (error);
1807 ifp->if_metric = ifr->ifr_metric;
1808 getmicrotime(&ifp->if_lastchange);
1809 break;
1810
1811 case SIOCSIFPHYS:
1812 error = priv_check(td, PRIV_NET_SETIFPHYS);
1813 if (error)
1814 return (error);
1815 if (ifp->if_ioctl == NULL)
1816 return (EOPNOTSUPP);
1817 IFF_LOCKGIANT(ifp);
1818 error = (*ifp->if_ioctl)(ifp, cmd, data);
1819 IFF_UNLOCKGIANT(ifp);
1820 if (error == 0)
1821 getmicrotime(&ifp->if_lastchange);
1822 break;
1823
1824 case SIOCSIFMTU:
1825 {
1826 u_long oldmtu = ifp->if_mtu;
1827
1828 error = priv_check(td, PRIV_NET_SETIFMTU);
1829 if (error)
1830 return (error);
1831 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
1832 return (EINVAL);
1833 if (ifp->if_ioctl == NULL)
1834 return (EOPNOTSUPP);
1835 IFF_LOCKGIANT(ifp);
1836 error = (*ifp->if_ioctl)(ifp, cmd, data);
1837 IFF_UNLOCKGIANT(ifp);
1838 if (error == 0) {
1839 getmicrotime(&ifp->if_lastchange);
1840 rt_ifmsg(ifp);
1841 }
1842 /*
1843 * If the link MTU changed, do network layer specific procedure.
1844 */
1845 if (ifp->if_mtu != oldmtu) {
1846 #ifdef INET6
1847 nd6_setmtu(ifp);
1848 #endif
1849 }
1850 break;
1851 }
1852
1853 case SIOCADDMULTI:
1854 case SIOCDELMULTI:
1855 if (cmd == SIOCADDMULTI)
1856 error = priv_check(td, PRIV_NET_ADDMULTI);
1857 else
1858 error = priv_check(td, PRIV_NET_DELMULTI);
1859 if (error)
1860 return (error);
1861
1862 /* Don't allow group membership on non-multicast interfaces. */
1863 if ((ifp->if_flags & IFF_MULTICAST) == 0)
1864 return (EOPNOTSUPP);
1865
1866 /* Don't let users screw up protocols' entries. */
1867 if (ifr->ifr_addr.sa_family != AF_LINK)
1868 return (EINVAL);
1869
1870 if (cmd == SIOCADDMULTI) {
1871 struct ifmultiaddr *ifma;
1872
1873 /*
1874 * Userland is only permitted to join groups once
1875 * via the if_addmulti() KPI, because it cannot hold
1876 * struct ifmultiaddr * between calls. It may also
1877 * lose a race while we check if the membership
1878 * already exists.
1879 */
1880 IF_ADDR_LOCK(ifp);
1881 ifma = if_findmulti(ifp, &ifr->ifr_addr);
1882 IF_ADDR_UNLOCK(ifp);
1883 if (ifma != NULL)
1884 error = EADDRINUSE;
1885 else
1886 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1887 } else {
1888 error = if_delmulti(ifp, &ifr->ifr_addr);
1889 }
1890 if (error == 0)
1891 getmicrotime(&ifp->if_lastchange);
1892 break;
1893
1894 case SIOCSIFPHYADDR:
1895 case SIOCDIFPHYADDR:
1896 #ifdef INET6
1897 case SIOCSIFPHYADDR_IN6:
1898 #endif
1899 case SIOCSLIFPHYADDR:
1900 case SIOCSIFMEDIA:
1901 case SIOCSIFGENERIC:
1902 error = priv_check(td, PRIV_NET_HWIOCTL);
1903 if (error)
1904 return (error);
1905 if (ifp->if_ioctl == NULL)
1906 return (EOPNOTSUPP);
1907 IFF_LOCKGIANT(ifp);
1908 error = (*ifp->if_ioctl)(ifp, cmd, data);
1909 IFF_UNLOCKGIANT(ifp);
1910 if (error == 0)
1911 getmicrotime(&ifp->if_lastchange);
1912 break;
1913
1914 case SIOCGIFSTATUS:
1915 ifs = (struct ifstat *)data;
1916 ifs->ascii[0] = '\0';
1917
1918 case SIOCGIFPSRCADDR:
1919 case SIOCGIFPDSTADDR:
1920 case SIOCGLIFPHYADDR:
1921 case SIOCGIFMEDIA:
1922 case SIOCGIFGENERIC:
1923 if (ifp->if_ioctl == NULL)
1924 return (EOPNOTSUPP);
1925 IFF_LOCKGIANT(ifp);
1926 error = (*ifp->if_ioctl)(ifp, cmd, data);
1927 IFF_UNLOCKGIANT(ifp);
1928 break;
1929
1930 case SIOCSIFLLADDR:
1931 error = priv_check(td, PRIV_NET_SETLLADDR);
1932 if (error)
1933 return (error);
1934 error = if_setlladdr(ifp,
1935 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
1936 break;
1937
1938 case SIOCAIFGROUP:
1939 {
1940 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
1941
1942 error = priv_check(td, PRIV_NET_ADDIFGROUP);
1943 if (error)
1944 return (error);
1945 if ((error = if_addgroup(ifp, ifgr->ifgr_group)))
1946 return (error);
1947 break;
1948 }
1949
1950 case SIOCGIFGROUP:
1951 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp)))
1952 return (error);
1953 break;
1954
1955 case SIOCDIFGROUP:
1956 {
1957 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr;
1958
1959 error = priv_check(td, PRIV_NET_DELIFGROUP);
1960 if (error)
1961 return (error);
1962 if ((error = if_delgroup(ifp, ifgr->ifgr_group)))
1963 return (error);
1964 break;
1965 }
1966
1967 default:
1968 error = ENOIOCTL;
1969 break;
1970 }
1971 return (error);
1972 }
1973
1974 /*
1975 * Interface ioctls.
1976 */
1977 int
1978 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
1979 {
1980 struct ifnet *ifp;
1981 struct ifreq *ifr;
1982 int error;
1983 int oif_flags;
1984
1985 switch (cmd) {
1986 case SIOCGIFCONF:
1987 case OSIOCGIFCONF:
1988 #ifdef __amd64__
1989 case SIOCGIFCONF32:
1990 #endif
1991 return (ifconf(cmd, data));
1992 }
1993 ifr = (struct ifreq *)data;
1994
1995 switch (cmd) {
1996 case SIOCIFCREATE:
1997 case SIOCIFCREATE2:
1998 error = priv_check(td, PRIV_NET_IFCREATE);
1999 if (error)
2000 return (error);
2001 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name),
2002 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL));
2003 case SIOCIFDESTROY:
2004 error = priv_check(td, PRIV_NET_IFDESTROY);
2005 if (error)
2006 return (error);
2007 return if_clone_destroy(ifr->ifr_name);
2008
2009 case SIOCIFGCLONERS:
2010 return (if_clone_list((struct if_clonereq *)data));
2011 case SIOCGIFGMEMB:
2012 return (if_getgroupmembers((struct ifgroupreq *)data));
2013 }
2014
2015 ifp = ifunit(ifr->ifr_name);
2016 if (ifp == 0)
2017 return (ENXIO);
2018
2019 error = ifhwioctl(cmd, ifp, data, td);
2020 if (error != ENOIOCTL)
2021 return (error);
2022
2023 oif_flags = ifp->if_flags;
2024 if (so->so_proto == 0)
2025 return (EOPNOTSUPP);
2026 #ifndef COMPAT_43
2027 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
2028 data,
2029 ifp, td));
2030 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL)
2031 error = (*ifp->if_ioctl)(ifp, cmd, data);
2032 #else
2033 {
2034 int ocmd = cmd;
2035
2036 switch (cmd) {
2037
2038 case SIOCSIFDSTADDR:
2039 case SIOCSIFADDR:
2040 case SIOCSIFBRDADDR:
2041 case SIOCSIFNETMASK:
2042 #if BYTE_ORDER != BIG_ENDIAN
2043 if (ifr->ifr_addr.sa_family == 0 &&
2044 ifr->ifr_addr.sa_len < 16) {
2045 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
2046 ifr->ifr_addr.sa_len = 16;
2047 }
2048 #else
2049 if (ifr->ifr_addr.sa_len == 0)
2050 ifr->ifr_addr.sa_len = 16;
2051 #endif
2052 break;
2053
2054 case OSIOCGIFADDR:
2055 cmd = SIOCGIFADDR;
2056 break;
2057
2058 case OSIOCGIFDSTADDR:
2059 cmd = SIOCGIFDSTADDR;
2060 break;
2061
2062 case OSIOCGIFBRDADDR:
2063 cmd = SIOCGIFBRDADDR;
2064 break;
2065
2066 case OSIOCGIFNETMASK:
2067 cmd = SIOCGIFNETMASK;
2068 }
2069 error = ((*so->so_proto->pr_usrreqs->pru_control)(so,
2070 cmd,
2071 data,
2072 ifp, td));
2073 if (error == EOPNOTSUPP && ifp != NULL &&
2074 ifp->if_ioctl != NULL)
2075 error = (*ifp->if_ioctl)(ifp, cmd, data);
2076 switch (ocmd) {
2077
2078 case OSIOCGIFADDR:
2079 case OSIOCGIFDSTADDR:
2080 case OSIOCGIFBRDADDR:
2081 case OSIOCGIFNETMASK:
2082 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
2083
2084 }
2085 }
2086 #endif /* COMPAT_43 */
2087
2088 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
2089 #ifdef INET6
2090 DELAY(100);/* XXX: temporary workaround for fxp issue*/
2091 if (ifp->if_flags & IFF_UP) {
2092 int s = splimp();
2093 in6_if_up(ifp);
2094 splx(s);
2095 }
2096 #endif
2097 }
2098 return (error);
2099 }
2100
2101 /*
2102 * The code common to handling reference counted flags,
2103 * e.g., in ifpromisc() and if_allmulti().
2104 * The "pflag" argument can specify a permanent mode flag to check,
2105 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
2106 *
2107 * Only to be used on stack-owned flags, not driver-owned flags.
2108 */
2109 static int
2110 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
2111 {
2112 struct ifreq ifr;
2113 int error;
2114 int oldflags, oldcount;
2115
2116 /* Sanity checks to catch programming errors */
2117 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
2118 ("%s: setting driver-owned flag %d", __func__, flag));
2119
2120 if (onswitch)
2121 KASSERT(*refcount >= 0,
2122 ("%s: increment negative refcount %d for flag %d",
2123 __func__, *refcount, flag));
2124 else
2125 KASSERT(*refcount > 0,
2126 ("%s: decrement non-positive refcount %d for flag %d",
2127 __func__, *refcount, flag));
2128
2129 /* In case this mode is permanent, just touch refcount */
2130 if (ifp->if_flags & pflag) {
2131 *refcount += onswitch ? 1 : -1;
2132 return (0);
2133 }
2134
2135 /* Save ifnet parameters for if_ioctl() may fail */
2136 oldcount = *refcount;
2137 oldflags = ifp->if_flags;
2138
2139 /*
2140 * See if we aren't the only and touching refcount is enough.
2141 * Actually toggle interface flag if we are the first or last.
2142 */
2143 if (onswitch) {
2144 if ((*refcount)++)
2145 return (0);
2146 ifp->if_flags |= flag;
2147 } else {
2148 if (--(*refcount))
2149 return (0);
2150 ifp->if_flags &= ~flag;
2151 }
2152
2153 /* Call down the driver since we've changed interface flags */
2154 if (ifp->if_ioctl == NULL) {
2155 error = EOPNOTSUPP;
2156 goto recover;
2157 }
2158 ifr.ifr_flags = ifp->if_flags & 0xffff;
2159 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2160 IFF_LOCKGIANT(ifp);
2161 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2162 IFF_UNLOCKGIANT(ifp);
2163 if (error)
2164 goto recover;
2165 /* Notify userland that interface flags have changed */
2166 rt_ifmsg(ifp);
2167 return (0);
2168
2169 recover:
2170 /* Recover after driver error */
2171 *refcount = oldcount;
2172 ifp->if_flags = oldflags;
2173 return (error);
2174 }
2175
2176 /*
2177 * Set/clear promiscuous mode on interface ifp based on the truth value
2178 * of pswitch. The calls are reference counted so that only the first
2179 * "on" request actually has an effect, as does the final "off" request.
2180 * Results are undefined if the "off" and "on" requests are not matched.
2181 */
2182 int
2183 ifpromisc(struct ifnet *ifp, int pswitch)
2184 {
2185 int error;
2186 int oldflags = ifp->if_flags;
2187
2188 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
2189 &ifp->if_pcount, pswitch);
2190 /* If promiscuous mode status has changed, log a message */
2191 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC))
2192 log(LOG_INFO, "%s: promiscuous mode %s\n",
2193 ifp->if_xname,
2194 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
2195 return (error);
2196 }
2197
2198 /*
2199 * Return interface configuration
2200 * of system. List may be used
2201 * in later ioctl's (above) to get
2202 * other information.
2203 */
2204 /*ARGSUSED*/
2205 static int
2206 ifconf(u_long cmd, caddr_t data)
2207 {
2208 struct ifconf *ifc = (struct ifconf *)data;
2209 #ifdef __amd64__
2210 struct ifconf32 *ifc32 = (struct ifconf32 *)data;
2211 struct ifconf ifc_swab;
2212 #endif
2213 struct ifnet *ifp;
2214 struct ifaddr *ifa;
2215 struct ifreq ifr;
2216 struct sbuf *sb;
2217 int error, full = 0, valid_len, max_len;
2218
2219 #ifdef __amd64__
2220 if (cmd == SIOCGIFCONF32) {
2221 ifc_swab.ifc_len = ifc32->ifc_len;
2222 ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf;
2223 ifc = &ifc_swab;
2224 }
2225 #endif
2226 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
2227 max_len = MAXPHYS - 1;
2228
2229 /* Prevent hostile input from being able to crash the system */
2230 if (ifc->ifc_len <= 0)
2231 return (EINVAL);
2232
2233 again:
2234 if (ifc->ifc_len <= max_len) {
2235 max_len = ifc->ifc_len;
2236 full = 1;
2237 }
2238 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
2239 max_len = 0;
2240 valid_len = 0;
2241
2242 IFNET_RLOCK(); /* could sleep XXX */
2243 TAILQ_FOREACH(ifp, &ifnet, if_link) {
2244 int addrs;
2245
2246 /*
2247 * Zero the ifr_name buffer to make sure we don't
2248 * disclose the contents of the stack.
2249 */
2250 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name));
2251
2252 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
2253 >= sizeof(ifr.ifr_name)) {
2254 sbuf_delete(sb);
2255 IFNET_RUNLOCK();
2256 return (ENAMETOOLONG);
2257 }
2258
2259 addrs = 0;
2260 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2261 struct sockaddr *sa = ifa->ifa_addr;
2262
2263 if (prison_if(curthread->td_ucred, sa) != 0)
2264 continue;
2265 addrs++;
2266 #ifdef COMPAT_43
2267 if (cmd == OSIOCGIFCONF) {
2268 struct osockaddr *osa =
2269 (struct osockaddr *)&ifr.ifr_addr;
2270 ifr.ifr_addr = *sa;
2271 osa->sa_family = sa->sa_family;
2272 sbuf_bcat(sb, &ifr, sizeof(ifr));
2273 max_len += sizeof(ifr);
2274 } else
2275 #endif
2276 if (sa->sa_len <= sizeof(*sa)) {
2277 ifr.ifr_addr = *sa;
2278 sbuf_bcat(sb, &ifr, sizeof(ifr));
2279 max_len += sizeof(ifr);
2280 } else {
2281 sbuf_bcat(sb, &ifr,
2282 offsetof(struct ifreq, ifr_addr));
2283 max_len += offsetof(struct ifreq, ifr_addr);
2284 sbuf_bcat(sb, sa, sa->sa_len);
2285 max_len += sa->sa_len;
2286 }
2287
2288 if (!sbuf_overflowed(sb))
2289 valid_len = sbuf_len(sb);
2290 }
2291 if (addrs == 0) {
2292 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
2293 sbuf_bcat(sb, &ifr, sizeof(ifr));
2294 max_len += sizeof(ifr);
2295
2296 if (!sbuf_overflowed(sb))
2297 valid_len = sbuf_len(sb);
2298 }
2299 }
2300 IFNET_RUNLOCK();
2301
2302 /*
2303 * If we didn't allocate enough space (uncommon), try again. If
2304 * we have already allocated as much space as we are allowed,
2305 * return what we've got.
2306 */
2307 if (valid_len != max_len && !full) {
2308 sbuf_delete(sb);
2309 goto again;
2310 }
2311
2312 ifc->ifc_len = valid_len;
2313 #ifdef __amd64__
2314 if (cmd == SIOCGIFCONF32)
2315 ifc32->ifc_len = valid_len;
2316 #endif
2317 sbuf_finish(sb);
2318 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
2319 sbuf_delete(sb);
2320 return (error);
2321 }
2322
2323 /*
2324 * Just like ifpromisc(), but for all-multicast-reception mode.
2325 */
2326 int
2327 if_allmulti(struct ifnet *ifp, int onswitch)
2328 {
2329
2330 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
2331 }
2332
2333 struct ifmultiaddr *
2334 if_findmulti(struct ifnet *ifp, struct sockaddr *sa)
2335 {
2336 struct ifmultiaddr *ifma;
2337
2338 IF_ADDR_LOCK_ASSERT(ifp);
2339
2340 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2341 if (sa->sa_family == AF_LINK) {
2342 if (sa_dl_equal(ifma->ifma_addr, sa))
2343 break;
2344 } else {
2345 if (sa_equal(ifma->ifma_addr, sa))
2346 break;
2347 }
2348 }
2349
2350 return ifma;
2351 }
2352
2353 /*
2354 * Allocate a new ifmultiaddr and initialize based on passed arguments. We
2355 * make copies of passed sockaddrs. The ifmultiaddr will not be added to
2356 * the ifnet multicast address list here, so the caller must do that and
2357 * other setup work (such as notifying the device driver). The reference
2358 * count is initialized to 1.
2359 */
2360 static struct ifmultiaddr *
2361 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
2362 int mflags)
2363 {
2364 struct ifmultiaddr *ifma;
2365 struct sockaddr *dupsa;
2366
2367 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, mflags |
2368 M_ZERO);
2369 if (ifma == NULL)
2370 return (NULL);
2371
2372 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, mflags);
2373 if (dupsa == NULL) {
2374 FREE(ifma, M_IFMADDR);
2375 return (NULL);
2376 }
2377 bcopy(sa, dupsa, sa->sa_len);
2378 ifma->ifma_addr = dupsa;
2379
2380 ifma->ifma_ifp = ifp;
2381 ifma->ifma_refcount = 1;
2382 ifma->ifma_protospec = NULL;
2383
2384 if (llsa == NULL) {
2385 ifma->ifma_lladdr = NULL;
2386 return (ifma);
2387 }
2388
2389 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, M_IFMADDR, mflags);
2390 if (dupsa == NULL) {
2391 FREE(ifma->ifma_addr, M_IFMADDR);
2392 FREE(ifma, M_IFMADDR);
2393 return (NULL);
2394 }
2395 bcopy(llsa, dupsa, llsa->sa_len);
2396 ifma->ifma_lladdr = dupsa;
2397
2398 return (ifma);
2399 }
2400
2401 /*
2402 * if_freemulti: free ifmultiaddr structure and possibly attached related
2403 * addresses. The caller is responsible for implementing reference
2404 * counting, notifying the driver, handling routing messages, and releasing
2405 * any dependent link layer state.
2406 */
2407 static void
2408 if_freemulti(struct ifmultiaddr *ifma)
2409 {
2410
2411 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
2412 ifma->ifma_refcount));
2413 KASSERT(ifma->ifma_protospec == NULL,
2414 ("if_freemulti: protospec not NULL"));
2415
2416 if (ifma->ifma_lladdr != NULL)
2417 FREE(ifma->ifma_lladdr, M_IFMADDR);
2418 FREE(ifma->ifma_addr, M_IFMADDR);
2419 FREE(ifma, M_IFMADDR);
2420 }
2421
2422 /*
2423 * Register an additional multicast address with a network interface.
2424 *
2425 * - If the address is already present, bump the reference count on the
2426 * address and return.
2427 * - If the address is not link-layer, look up a link layer address.
2428 * - Allocate address structures for one or both addresses, and attach to the
2429 * multicast address list on the interface. If automatically adding a link
2430 * layer address, the protocol address will own a reference to the link
2431 * layer address, to be freed when it is freed.
2432 * - Notify the network device driver of an addition to the multicast address
2433 * list.
2434 *
2435 * 'sa' points to caller-owned memory with the desired multicast address.
2436 *
2437 * 'retifma' will be used to return a pointer to the resulting multicast
2438 * address reference, if desired.
2439 */
2440 int
2441 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
2442 struct ifmultiaddr **retifma)
2443 {
2444 struct ifmultiaddr *ifma, *ll_ifma;
2445 struct sockaddr *llsa;
2446 int error;
2447
2448 /*
2449 * If the address is already present, return a new reference to it;
2450 * otherwise, allocate storage and set up a new address.
2451 */
2452 IF_ADDR_LOCK(ifp);
2453 ifma = if_findmulti(ifp, sa);
2454 if (ifma != NULL) {
2455 ifma->ifma_refcount++;
2456 if (retifma != NULL)
2457 *retifma = ifma;
2458 IF_ADDR_UNLOCK(ifp);
2459 return (0);
2460 }
2461
2462 /*
2463 * The address isn't already present; resolve the protocol address
2464 * into a link layer address, and then look that up, bump its
2465 * refcount or allocate an ifma for that also. If 'llsa' was
2466 * returned, we will need to free it later.
2467 */
2468 llsa = NULL;
2469 ll_ifma = NULL;
2470 if (ifp->if_resolvemulti != NULL) {
2471 error = ifp->if_resolvemulti(ifp, &llsa, sa);
2472 if (error)
2473 goto unlock_out;
2474 }
2475
2476 /*
2477 * Allocate the new address. Don't hook it up yet, as we may also
2478 * need to allocate a link layer multicast address.
2479 */
2480 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
2481 if (ifma == NULL) {
2482 error = ENOMEM;
2483 goto free_llsa_out;
2484 }
2485
2486 /*
2487 * If a link layer address is found, we'll need to see if it's
2488 * already present in the address list, or allocate is as well.
2489 * When this block finishes, the link layer address will be on the
2490 * list.
2491 */
2492 if (llsa != NULL) {
2493 ll_ifma = if_findmulti(ifp, llsa);
2494 if (ll_ifma == NULL) {
2495 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
2496 if (ll_ifma == NULL) {
2497 --ifma->ifma_refcount;
2498 if_freemulti(ifma);
2499 error = ENOMEM;
2500 goto free_llsa_out;
2501 }
2502 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
2503 ifma_link);
2504 } else
2505 ll_ifma->ifma_refcount++;
2506 ifma->ifma_llifma = ll_ifma;
2507 }
2508
2509 /*
2510 * We now have a new multicast address, ifma, and possibly a new or
2511 * referenced link layer address. Add the primary address to the
2512 * ifnet address list.
2513 */
2514 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
2515
2516 if (retifma != NULL)
2517 *retifma = ifma;
2518
2519 /*
2520 * Must generate the message while holding the lock so that 'ifma'
2521 * pointer is still valid.
2522 */
2523 rt_newmaddrmsg(RTM_NEWMADDR, ifma);
2524 IF_ADDR_UNLOCK(ifp);
2525
2526 /*
2527 * We are certain we have added something, so call down to the
2528 * interface to let them know about it.
2529 */
2530 if (ifp->if_ioctl != NULL) {
2531 IFF_LOCKGIANT(ifp);
2532 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
2533 IFF_UNLOCKGIANT(ifp);
2534 }
2535
2536 if (llsa != NULL)
2537 FREE(llsa, M_IFMADDR);
2538
2539 return (0);
2540
2541 free_llsa_out:
2542 if (llsa != NULL)
2543 FREE(llsa, M_IFMADDR);
2544
2545 unlock_out:
2546 IF_ADDR_UNLOCK(ifp);
2547 return (error);
2548 }
2549
2550 /*
2551 * Delete a multicast group membership by network-layer group address.
2552 *
2553 * Returns ENOENT if the entry could not be found. If ifp no longer
2554 * exists, results are undefined. This entry point should only be used
2555 * from subsystems which do appropriate locking to hold ifp for the
2556 * duration of the call.
2557 * Network-layer protocol domains must use if_delmulti_ifma().
2558 */
2559 int
2560 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
2561 {
2562 struct ifmultiaddr *ifma;
2563 int lastref;
2564 #ifdef INVARIANTS
2565 struct ifnet *oifp;
2566
2567 IFNET_RLOCK();
2568 TAILQ_FOREACH(oifp, &ifnet, if_link)
2569 if (ifp == oifp)
2570 break;
2571 if (ifp != oifp)
2572 ifp = NULL;
2573 IFNET_RUNLOCK();
2574
2575 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
2576 #endif
2577 if (ifp == NULL)
2578 return (ENOENT);
2579
2580 IF_ADDR_LOCK(ifp);
2581 lastref = 0;
2582 ifma = if_findmulti(ifp, sa);
2583 if (ifma != NULL)
2584 lastref = if_delmulti_locked(ifp, ifma, 0);
2585 IF_ADDR_UNLOCK(ifp);
2586
2587 if (ifma == NULL)
2588 return (ENOENT);
2589
2590 if (lastref && ifp->if_ioctl != NULL) {
2591 IFF_LOCKGIANT(ifp);
2592 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
2593 IFF_UNLOCKGIANT(ifp);
2594 }
2595
2596 return (0);
2597 }
2598
2599 /*
2600 * Delete a multicast group membership by group membership pointer.
2601 * Network-layer protocol domains must use this routine.
2602 *
2603 * It is safe to call this routine if the ifp disappeared. Callers should
2604 * hold IFF_LOCKGIANT() to avoid a LOR in case the hardware needs to be
2605 * reconfigured.
2606 */
2607 void
2608 if_delmulti_ifma(struct ifmultiaddr *ifma)
2609 {
2610 struct ifnet *ifp;
2611 int lastref;
2612
2613 ifp = ifma->ifma_ifp;
2614 #ifdef DIAGNOSTIC
2615 if (ifp == NULL) {
2616 printf("%s: ifma_ifp seems to be detached\n", __func__);
2617 } else {
2618 struct ifnet *oifp;
2619
2620 IFNET_RLOCK();
2621 TAILQ_FOREACH(oifp, &ifnet, if_link)
2622 if (ifp == oifp)
2623 break;
2624 if (ifp != oifp) {
2625 printf("%s: ifnet %p disappeared\n", __func__, ifp);
2626 ifp = NULL;
2627 }
2628 IFNET_RUNLOCK();
2629 }
2630 #endif
2631 /*
2632 * If and only if the ifnet instance exists: Acquire the address lock.
2633 */
2634 if (ifp != NULL)
2635 IF_ADDR_LOCK(ifp);
2636
2637 lastref = if_delmulti_locked(ifp, ifma, 0);
2638
2639 if (ifp != NULL) {
2640 /*
2641 * If and only if the ifnet instance exists:
2642 * Release the address lock.
2643 * If the group was left: update the hardware hash filter.
2644 */
2645 IF_ADDR_UNLOCK(ifp);
2646 if (lastref && ifp->if_ioctl != NULL) {
2647 IFF_LOCKGIANT(ifp);
2648 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
2649 IFF_UNLOCKGIANT(ifp);
2650 }
2651 }
2652 }
2653
2654 /*
2655 * Perform deletion of network-layer and/or link-layer multicast address.
2656 *
2657 * Return 0 if the reference count was decremented.
2658 * Return 1 if the final reference was released, indicating that the
2659 * hardware hash filter should be reprogrammed.
2660 */
2661 static int
2662 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
2663 {
2664 struct ifmultiaddr *ll_ifma;
2665
2666 if (ifp != NULL && ifma->ifma_ifp != NULL) {
2667 KASSERT(ifma->ifma_ifp == ifp,
2668 ("%s: inconsistent ifp %p", __func__, ifp));
2669 IF_ADDR_LOCK_ASSERT(ifp);
2670 }
2671
2672 ifp = ifma->ifma_ifp;
2673
2674 /*
2675 * If the ifnet is detaching, null out references to ifnet,
2676 * so that upper protocol layers will notice, and not attempt
2677 * to obtain locks for an ifnet which no longer exists. The
2678 * routing socket announcement must happen before the ifnet
2679 * instance is detached from the system.
2680 */
2681 if (detaching) {
2682 #ifdef DIAGNOSTIC
2683 printf("%s: detaching ifnet instance %p\n", __func__, ifp);
2684 #endif
2685 /*
2686 * ifp may already be nulled out if we are being reentered
2687 * to delete the ll_ifma.
2688 */
2689 if (ifp != NULL) {
2690 rt_newmaddrmsg(RTM_DELMADDR, ifma);
2691 ifma->ifma_ifp = NULL;
2692 }
2693 }
2694
2695 if (--ifma->ifma_refcount > 0)
2696 return 0;
2697
2698 /*
2699 * If this ifma is a network-layer ifma, a link-layer ifma may
2700 * have been associated with it. Release it first if so.
2701 */
2702 ll_ifma = ifma->ifma_llifma;
2703 if (ll_ifma != NULL) {
2704 KASSERT(ifma->ifma_lladdr != NULL,
2705 ("%s: llifma w/o lladdr", __func__));
2706 if (detaching)
2707 ll_ifma->ifma_ifp = NULL; /* XXX */
2708 if (--ll_ifma->ifma_refcount == 0) {
2709 if (ifp != NULL) {
2710 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma,
2711 ifma_link);
2712 }
2713 if_freemulti(ll_ifma);
2714 }
2715 }
2716
2717 if (ifp != NULL)
2718 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
2719
2720 if_freemulti(ifma);
2721
2722 /*
2723 * The last reference to this instance of struct ifmultiaddr
2724 * was released; the hardware should be notified of this change.
2725 */
2726 return 1;
2727 }
2728
2729 /*
2730 * Set the link layer address on an interface.
2731 *
2732 * At this time we only support certain types of interfaces,
2733 * and we don't allow the length of the address to change.
2734 */
2735 int
2736 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
2737 {
2738 struct sockaddr_dl *sdl;
2739 struct ifaddr *ifa;
2740 struct ifreq ifr;
2741
2742 ifa = ifp->if_addr;
2743 if (ifa == NULL)
2744 return (EINVAL);
2745 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2746 if (sdl == NULL)
2747 return (EINVAL);
2748 if (len != sdl->sdl_alen) /* don't allow length to change */
2749 return (EINVAL);
2750 switch (ifp->if_type) {
2751 case IFT_ETHER:
2752 case IFT_FDDI:
2753 case IFT_XETHER:
2754 case IFT_ISO88025:
2755 case IFT_L2VLAN:
2756 case IFT_BRIDGE:
2757 case IFT_ARCNET:
2758 case IFT_IEEE8023ADLAG:
2759 bcopy(lladdr, LLADDR(sdl), len);
2760 break;
2761 default:
2762 return (ENODEV);
2763 }
2764 /*
2765 * If the interface is already up, we need
2766 * to re-init it in order to reprogram its
2767 * address filter.
2768 */
2769 if ((ifp->if_flags & IFF_UP) != 0) {
2770 if (ifp->if_ioctl) {
2771 IFF_LOCKGIANT(ifp);
2772 ifp->if_flags &= ~IFF_UP;
2773 ifr.ifr_flags = ifp->if_flags & 0xffff;
2774 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2775 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2776 ifp->if_flags |= IFF_UP;
2777 ifr.ifr_flags = ifp->if_flags & 0xffff;
2778 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2779 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
2780 IFF_UNLOCKGIANT(ifp);
2781 }
2782 #ifdef INET
2783 /*
2784 * Also send gratuitous ARPs to notify other nodes about
2785 * the address change.
2786 */
2787 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2788 if (ifa->ifa_addr->sa_family == AF_INET)
2789 arp_ifinit(ifp, ifa);
2790 }
2791 #endif
2792 }
2793 return (0);
2794 }
2795
2796 /*
2797 * The name argument must be a pointer to storage which will last as
2798 * long as the interface does. For physical devices, the result of
2799 * device_get_name(dev) is a good choice and for pseudo-devices a
2800 * static string works well.
2801 */
2802 void
2803 if_initname(struct ifnet *ifp, const char *name, int unit)
2804 {
2805 ifp->if_dname = name;
2806 ifp->if_dunit = unit;
2807 if (unit != IF_DUNIT_NONE)
2808 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
2809 else
2810 strlcpy(ifp->if_xname, name, IFNAMSIZ);
2811 }
2812
2813 int
2814 if_printf(struct ifnet *ifp, const char * fmt, ...)
2815 {
2816 va_list ap;
2817 int retval;
2818
2819 retval = printf("%s: ", ifp->if_xname);
2820 va_start(ap, fmt);
2821 retval += vprintf(fmt, ap);
2822 va_end(ap);
2823 return (retval);
2824 }
2825
2826 /*
2827 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot
2828 * be called without Giant. However, we often can't acquire the Giant lock
2829 * at those points; instead, we run it via a task queue that holds Giant via
2830 * if_start_deferred.
2831 *
2832 * XXXRW: We need to make sure that the ifnet isn't fully detached until any
2833 * outstanding if_start_deferred() tasks that will run after the free. This
2834 * probably means waiting in if_detach().
2835 */
2836 void
2837 if_start(struct ifnet *ifp)
2838 {
2839
2840 if (ifp->if_flags & IFF_NEEDSGIANT) {
2841 if (mtx_owned(&Giant))
2842 (*(ifp)->if_start)(ifp);
2843 else
2844 taskqueue_enqueue(taskqueue_swi_giant,
2845 &ifp->if_starttask);
2846 } else
2847 (*(ifp)->if_start)(ifp);
2848 }
2849
2850 static void
2851 if_start_deferred(void *context, int pending)
2852 {
2853 struct ifnet *ifp;
2854
2855 GIANT_REQUIRED;
2856
2857 ifp = context;
2858 (ifp->if_start)(ifp);
2859 }
2860
2861 int
2862 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
2863 {
2864 int active = 0;
2865
2866 IF_LOCK(ifq);
2867 if (_IF_QFULL(ifq)) {
2868 _IF_DROP(ifq);
2869 IF_UNLOCK(ifq);
2870 m_freem(m);
2871 return (0);
2872 }
2873 if (ifp != NULL) {
2874 ifp->if_obytes += m->m_pkthdr.len + adjust;
2875 if (m->m_flags & (M_BCAST|M_MCAST))
2876 ifp->if_omcasts++;
2877 active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
2878 }
2879 _IF_ENQUEUE(ifq, m);
2880 IF_UNLOCK(ifq);
2881 if (ifp != NULL && !active)
2882 if_start(ifp);
2883 return (1);
2884 }
2885
2886 void
2887 if_register_com_alloc(u_char type,
2888 if_com_alloc_t *a, if_com_free_t *f)
2889 {
2890
2891 KASSERT(if_com_alloc[type] == NULL,
2892 ("if_register_com_alloc: %d already registered", type));
2893 KASSERT(if_com_free[type] == NULL,
2894 ("if_register_com_alloc: %d free already registered", type));
2895
2896 if_com_alloc[type] = a;
2897 if_com_free[type] = f;
2898 }
2899
2900 void
2901 if_deregister_com_alloc(u_char type)
2902 {
2903
2904 KASSERT(if_com_alloc[type] != NULL,
2905 ("if_deregister_com_alloc: %d not registered", type));
2906 KASSERT(if_com_free[type] != NULL,
2907 ("if_deregister_com_alloc: %d free not registered", type));
2908 if_com_alloc[type] = NULL;
2909 if_com_free[type] = NULL;
2910 }
Cache object: 18d35db02c72eefc67eb1a8c07f82e46
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