FreeBSD/Linux Kernel Cross Reference
sys/net/if.c
1 /* $NetBSD: if.c,v 1.528 2022/11/25 06:18:42 msaitoh Exp $ */
2
3 /*-
4 * Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by William Studenmund and Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the project nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61 /*
62 * Copyright (c) 1980, 1986, 1993
63 * The Regents of the University of California. All rights reserved.
64 *
65 * Redistribution and use in source and binary forms, with or without
66 * modification, are permitted provided that the following conditions
67 * are met:
68 * 1. Redistributions of source code must retain the above copyright
69 * notice, this list of conditions and the following disclaimer.
70 * 2. Redistributions in binary form must reproduce the above copyright
71 * notice, this list of conditions and the following disclaimer in the
72 * documentation and/or other materials provided with the distribution.
73 * 3. Neither the name of the University nor the names of its contributors
74 * may be used to endorse or promote products derived from this software
75 * without specific prior written permission.
76 *
77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
87 * SUCH DAMAGE.
88 *
89 * @(#)if.c 8.5 (Berkeley) 1/9/95
90 */
91
92 #include <sys/cdefs.h>
93 __KERNEL_RCSID(0, "$NetBSD: if.c,v 1.528 2022/11/25 06:18:42 msaitoh Exp $");
94
95 #if defined(_KERNEL_OPT)
96 #include "opt_inet.h"
97 #include "opt_ipsec.h"
98 #include "opt_atalk.h"
99 #include "opt_wlan.h"
100 #include "opt_net_mpsafe.h"
101 #include "opt_mrouting.h"
102 #endif
103
104 #include <sys/param.h>
105 #include <sys/mbuf.h>
106 #include <sys/systm.h>
107 #include <sys/callout.h>
108 #include <sys/proc.h>
109 #include <sys/socket.h>
110 #include <sys/socketvar.h>
111 #include <sys/domain.h>
112 #include <sys/protosw.h>
113 #include <sys/kernel.h>
114 #include <sys/ioctl.h>
115 #include <sys/sysctl.h>
116 #include <sys/syslog.h>
117 #include <sys/kauth.h>
118 #include <sys/kmem.h>
119 #include <sys/xcall.h>
120 #include <sys/cpu.h>
121 #include <sys/intr.h>
122 #include <sys/module_hook.h>
123 #include <sys/compat_stub.h>
124 #include <sys/msan.h>
125 #include <sys/hook.h>
126
127 #include <net/if.h>
128 #include <net/if_dl.h>
129 #include <net/if_ether.h>
130 #include <net/if_media.h>
131 #include <net80211/ieee80211.h>
132 #include <net80211/ieee80211_ioctl.h>
133 #include <net/if_types.h>
134 #include <net/route.h>
135 #include <sys/module.h>
136 #ifdef NETATALK
137 #include <netatalk/at_extern.h>
138 #include <netatalk/at.h>
139 #endif
140 #include <net/pfil.h>
141 #include <netinet/in.h>
142 #include <netinet/in_var.h>
143 #include <netinet/ip_encap.h>
144 #include <net/bpf.h>
145
146 #ifdef INET6
147 #include <netinet6/in6_var.h>
148 #include <netinet6/nd6.h>
149 #endif
150
151 #include "ether.h"
152
153 #include "bridge.h"
154 #if NBRIDGE > 0
155 #include <net/if_bridgevar.h>
156 #endif
157
158 #include "carp.h"
159 #if NCARP > 0
160 #include <netinet/ip_carp.h>
161 #endif
162
163 #include <compat/sys/sockio.h>
164
165 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
166 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
167
168 /*
169 * XXX reusing (ifp)->if_snd->ifq_lock rather than having another spin mutex
170 * for each ifnet. It doesn't matter because:
171 * - if IFEF_MPSAFE is enabled, if_snd isn't used and lock contentions on
172 * ifq_lock don't happen
173 * - if IFEF_MPSAFE is disabled, there is no lock contention on ifq_lock
174 * because if_snd, if_link_state_change and if_link_state_change_process
175 * are all called with KERNEL_LOCK
176 */
177 #define IF_LINK_STATE_CHANGE_LOCK(ifp) \
178 mutex_enter((ifp)->if_snd.ifq_lock)
179 #define IF_LINK_STATE_CHANGE_UNLOCK(ifp) \
180 mutex_exit((ifp)->if_snd.ifq_lock)
181
182 /*
183 * Global list of interfaces.
184 */
185 /* DEPRECATED. Remove it once kvm(3) users disappeared */
186 struct ifnet_head ifnet_list;
187
188 struct pslist_head ifnet_pslist;
189 static ifnet_t ** ifindex2ifnet = NULL;
190 static u_int if_index = 1;
191 static size_t if_indexlim = 0;
192 static uint64_t index_gen;
193 /* Mutex to protect the above objects. */
194 kmutex_t ifnet_mtx __cacheline_aligned;
195 static struct psref_class *ifnet_psref_class __read_mostly;
196 static pserialize_t ifnet_psz;
197 static struct workqueue *ifnet_link_state_wq __read_mostly;
198
199 static struct workqueue *if_slowtimo_wq __read_mostly;
200
201 static kmutex_t if_clone_mtx;
202
203 struct ifnet *lo0ifp;
204 int ifqmaxlen = IFQ_MAXLEN;
205
206 struct psref_class *ifa_psref_class __read_mostly;
207
208 static int if_delroute_matcher(struct rtentry *, void *);
209
210 static bool if_is_unit(const char *);
211 static struct if_clone *if_clone_lookup(const char *, int *);
212
213 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
214 static int if_cloners_count;
215
216 /* Packet filtering hook for interfaces. */
217 pfil_head_t * if_pfil __read_mostly;
218
219 static kauth_listener_t if_listener;
220
221 static int doifioctl(struct socket *, u_long, void *, struct lwp *);
222 static void sysctl_sndq_setup(struct sysctllog **, const char *,
223 struct ifaltq *);
224 static void if_slowtimo_intr(void *);
225 static void if_slowtimo_work(struct work *, void *);
226 static int sysctl_if_watchdog(SYSCTLFN_PROTO);
227 static void sysctl_watchdog_setup(struct ifnet *);
228 static void if_attachdomain1(struct ifnet *);
229 static int ifconf(u_long, void *);
230 static int if_transmit(struct ifnet *, struct mbuf *);
231 static int if_clone_create(const char *);
232 static int if_clone_destroy(const char *);
233 static void if_link_state_change_work(struct work *, void *);
234 static void if_up_locked(struct ifnet *);
235 static void _if_down(struct ifnet *);
236 static void if_down_deactivated(struct ifnet *);
237
238 struct if_percpuq {
239 struct ifnet *ipq_ifp;
240 void *ipq_si;
241 struct percpu *ipq_ifqs; /* struct ifqueue */
242 };
243
244 static struct mbuf *if_percpuq_dequeue(struct if_percpuq *);
245
246 static void if_percpuq_drops(void *, void *, struct cpu_info *);
247 static int sysctl_percpuq_drops_handler(SYSCTLFN_PROTO);
248 static void sysctl_percpuq_setup(struct sysctllog **, const char *,
249 struct if_percpuq *);
250
251 struct if_deferred_start {
252 struct ifnet *ids_ifp;
253 void (*ids_if_start)(struct ifnet *);
254 void *ids_si;
255 };
256
257 static void if_deferred_start_softint(void *);
258 static void if_deferred_start_common(struct ifnet *);
259 static void if_deferred_start_destroy(struct ifnet *);
260
261 struct if_slowtimo_data {
262 kmutex_t isd_lock;
263 struct callout isd_ch;
264 struct work isd_work;
265 struct ifnet *isd_ifp;
266 bool isd_queued;
267 bool isd_dying;
268 bool isd_trigger;
269 };
270
271 /*
272 * Hook for if_vlan - needed by if_agr
273 */
274 struct if_vlan_vlan_input_hook_t if_vlan_vlan_input_hook;
275
276 static void if_sysctl_setup(struct sysctllog **);
277
278 static int
279 if_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
280 void *arg0, void *arg1, void *arg2, void *arg3)
281 {
282 int result;
283 enum kauth_network_req req;
284
285 result = KAUTH_RESULT_DEFER;
286 req = (enum kauth_network_req)(uintptr_t)arg1;
287
288 if (action != KAUTH_NETWORK_INTERFACE)
289 return result;
290
291 if ((req == KAUTH_REQ_NETWORK_INTERFACE_GET) ||
292 (req == KAUTH_REQ_NETWORK_INTERFACE_SET))
293 result = KAUTH_RESULT_ALLOW;
294
295 return result;
296 }
297
298 /*
299 * Network interface utility routines.
300 *
301 * Routines with ifa_ifwith* names take sockaddr *'s as
302 * parameters.
303 */
304 void
305 ifinit(void)
306 {
307
308 #if (defined(INET) || defined(INET6))
309 encapinit();
310 #endif
311
312 if_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK,
313 if_listener_cb, NULL);
314
315 /* interfaces are available, inform socket code */
316 ifioctl = doifioctl;
317 }
318
319 /*
320 * XXX Initialization before configure().
321 * XXX hack to get pfil_add_hook working in autoconf.
322 */
323 void
324 ifinit1(void)
325 {
326 int error __diagused;
327
328 #ifdef NET_MPSAFE
329 printf("NET_MPSAFE enabled\n");
330 #endif
331
332 mutex_init(&if_clone_mtx, MUTEX_DEFAULT, IPL_NONE);
333
334 TAILQ_INIT(&ifnet_list);
335 mutex_init(&ifnet_mtx, MUTEX_DEFAULT, IPL_NONE);
336 ifnet_psz = pserialize_create();
337 ifnet_psref_class = psref_class_create("ifnet", IPL_SOFTNET);
338 ifa_psref_class = psref_class_create("ifa", IPL_SOFTNET);
339 error = workqueue_create(&ifnet_link_state_wq, "iflnkst",
340 if_link_state_change_work, NULL, PRI_SOFTNET, IPL_NET,
341 WQ_MPSAFE);
342 KASSERT(error == 0);
343 PSLIST_INIT(&ifnet_pslist);
344
345 error = workqueue_create(&if_slowtimo_wq, "ifwdog",
346 if_slowtimo_work, NULL, PRI_SOFTNET, IPL_SOFTCLOCK, WQ_MPSAFE);
347 KASSERTMSG(error == 0, "error=%d", error);
348
349 if_indexlim = 8;
350
351 if_pfil = pfil_head_create(PFIL_TYPE_IFNET, NULL);
352 KASSERT(if_pfil != NULL);
353
354 #if NETHER > 0 || defined(NETATALK) || defined(WLAN)
355 etherinit();
356 #endif
357 }
358
359 /* XXX must be after domaininit() */
360 void
361 ifinit_post(void)
362 {
363
364 if_sysctl_setup(NULL);
365 }
366
367 ifnet_t *
368 if_alloc(u_char type)
369 {
370
371 return kmem_zalloc(sizeof(ifnet_t), KM_SLEEP);
372 }
373
374 void
375 if_free(ifnet_t *ifp)
376 {
377
378 kmem_free(ifp, sizeof(ifnet_t));
379 }
380
381 void
382 if_initname(struct ifnet *ifp, const char *name, int unit)
383 {
384
385 (void)snprintf(ifp->if_xname, sizeof(ifp->if_xname),
386 "%s%d", name, unit);
387 }
388
389 /*
390 * Null routines used while an interface is going away. These routines
391 * just return an error.
392 */
393
394 int
395 if_nulloutput(struct ifnet *ifp, struct mbuf *m,
396 const struct sockaddr *so, const struct rtentry *rt)
397 {
398
399 return ENXIO;
400 }
401
402 void
403 if_nullinput(struct ifnet *ifp, struct mbuf *m)
404 {
405
406 /* Nothing. */
407 }
408
409 void
410 if_nullstart(struct ifnet *ifp)
411 {
412
413 /* Nothing. */
414 }
415
416 int
417 if_nulltransmit(struct ifnet *ifp, struct mbuf *m)
418 {
419
420 m_freem(m);
421 return ENXIO;
422 }
423
424 int
425 if_nullioctl(struct ifnet *ifp, u_long cmd, void *data)
426 {
427
428 return ENXIO;
429 }
430
431 int
432 if_nullinit(struct ifnet *ifp)
433 {
434
435 return ENXIO;
436 }
437
438 void
439 if_nullstop(struct ifnet *ifp, int disable)
440 {
441
442 /* Nothing. */
443 }
444
445 void
446 if_nullslowtimo(struct ifnet *ifp)
447 {
448
449 /* Nothing. */
450 }
451
452 void
453 if_nulldrain(struct ifnet *ifp)
454 {
455
456 /* Nothing. */
457 }
458
459 void
460 if_set_sadl(struct ifnet *ifp, const void *lla, u_char addrlen, bool factory)
461 {
462 struct ifaddr *ifa;
463 struct sockaddr_dl *sdl;
464
465 ifp->if_addrlen = addrlen;
466 if_alloc_sadl(ifp);
467 ifa = ifp->if_dl;
468 sdl = satosdl(ifa->ifa_addr);
469
470 (void)sockaddr_dl_setaddr(sdl, sdl->sdl_len, lla, ifp->if_addrlen);
471 if (factory) {
472 KASSERT(ifp->if_hwdl == NULL);
473 ifp->if_hwdl = ifp->if_dl;
474 ifaref(ifp->if_hwdl);
475 }
476 /* TBD routing socket */
477 }
478
479 struct ifaddr *
480 if_dl_create(const struct ifnet *ifp, const struct sockaddr_dl **sdlp)
481 {
482 unsigned socksize, ifasize;
483 int addrlen, namelen;
484 struct sockaddr_dl *mask, *sdl;
485 struct ifaddr *ifa;
486
487 namelen = strlen(ifp->if_xname);
488 addrlen = ifp->if_addrlen;
489 socksize = roundup(sockaddr_dl_measure(namelen, addrlen),
490 sizeof(long));
491 ifasize = sizeof(*ifa) + 2 * socksize;
492 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO);
493
494 sdl = (struct sockaddr_dl *)(ifa + 1);
495 mask = (struct sockaddr_dl *)(socksize + (char *)sdl);
496
497 sockaddr_dl_init(sdl, socksize, ifp->if_index, ifp->if_type,
498 ifp->if_xname, namelen, NULL, addrlen);
499 mask->sdl_family = AF_LINK;
500 mask->sdl_len = sockaddr_dl_measure(namelen, 0);
501 memset(&mask->sdl_data[0], 0xff, namelen);
502 ifa->ifa_rtrequest = link_rtrequest;
503 ifa->ifa_addr = (struct sockaddr *)sdl;
504 ifa->ifa_netmask = (struct sockaddr *)mask;
505 ifa_psref_init(ifa);
506
507 *sdlp = sdl;
508
509 return ifa;
510 }
511
512 static void
513 if_sadl_setrefs(struct ifnet *ifp, struct ifaddr *ifa)
514 {
515 const struct sockaddr_dl *sdl;
516
517 ifp->if_dl = ifa;
518 ifaref(ifa);
519 sdl = satosdl(ifa->ifa_addr);
520 ifp->if_sadl = sdl;
521 }
522
523 /*
524 * Allocate the link level name for the specified interface. This
525 * is an attachment helper. It must be called after ifp->if_addrlen
526 * is initialized, which may not be the case when if_attach() is
527 * called.
528 */
529 void
530 if_alloc_sadl(struct ifnet *ifp)
531 {
532 struct ifaddr *ifa;
533 const struct sockaddr_dl *sdl;
534
535 /*
536 * If the interface already has a link name, release it
537 * now. This is useful for interfaces that can change
538 * link types, and thus switch link names often.
539 */
540 if (ifp->if_sadl != NULL)
541 if_free_sadl(ifp, 0);
542
543 ifa = if_dl_create(ifp, &sdl);
544
545 ifa_insert(ifp, ifa);
546 if_sadl_setrefs(ifp, ifa);
547 }
548
549 static void
550 if_deactivate_sadl(struct ifnet *ifp)
551 {
552 struct ifaddr *ifa;
553
554 KASSERT(ifp->if_dl != NULL);
555
556 ifa = ifp->if_dl;
557
558 ifp->if_sadl = NULL;
559
560 ifp->if_dl = NULL;
561 ifafree(ifa);
562 }
563
564 static void
565 if_replace_sadl(struct ifnet *ifp, struct ifaddr *ifa)
566 {
567 struct ifaddr *old;
568
569 KASSERT(ifp->if_dl != NULL);
570
571 old = ifp->if_dl;
572
573 ifaref(ifa);
574 /* XXX Update if_dl and if_sadl atomically */
575 ifp->if_dl = ifa;
576 ifp->if_sadl = satosdl(ifa->ifa_addr);
577
578 ifafree(old);
579 }
580
581 void
582 if_activate_sadl(struct ifnet *ifp, struct ifaddr *ifa0,
583 const struct sockaddr_dl *sdl)
584 {
585 struct ifaddr *ifa;
586 const int bound = curlwp_bind();
587
588 KASSERT(ifa_held(ifa0));
589
590 const int s = splsoftnet();
591
592 if_replace_sadl(ifp, ifa0);
593
594 int ss = pserialize_read_enter();
595 IFADDR_READER_FOREACH(ifa, ifp) {
596 struct psref psref;
597 ifa_acquire(ifa, &psref);
598 pserialize_read_exit(ss);
599
600 rtinit(ifa, RTM_LLINFO_UPD, 0);
601
602 ss = pserialize_read_enter();
603 ifa_release(ifa, &psref);
604 }
605 pserialize_read_exit(ss);
606
607 splx(s);
608 curlwp_bindx(bound);
609 }
610
611 /*
612 * Free the link level name for the specified interface. This is
613 * a detach helper. This is called from if_detach().
614 */
615 void
616 if_free_sadl(struct ifnet *ifp, int factory)
617 {
618 struct ifaddr *ifa;
619
620 if (factory && ifp->if_hwdl != NULL) {
621 ifa = ifp->if_hwdl;
622 ifp->if_hwdl = NULL;
623 ifafree(ifa);
624 }
625
626 ifa = ifp->if_dl;
627 if (ifa == NULL) {
628 KASSERT(ifp->if_sadl == NULL);
629 return;
630 }
631
632 KASSERT(ifp->if_sadl != NULL);
633
634 const int s = splsoftnet();
635 KASSERT(ifa->ifa_addr->sa_family == AF_LINK);
636 ifa_remove(ifp, ifa);
637 if_deactivate_sadl(ifp);
638 splx(s);
639 }
640
641 static void
642 if_getindex(ifnet_t *ifp)
643 {
644 bool hitlimit = false;
645 char xnamebuf[HOOKNAMSIZ];
646
647 ifp->if_index_gen = index_gen++;
648 snprintf(xnamebuf, sizeof(xnamebuf), "%s-lshk", ifp->if_xname);
649 ifp->if_linkstate_hooks = simplehook_create(IPL_NET,
650 xnamebuf);
651
652 ifp->if_index = if_index;
653 if (ifindex2ifnet == NULL) {
654 if_index++;
655 goto skip;
656 }
657 while (if_byindex(ifp->if_index)) {
658 /*
659 * If we hit USHRT_MAX, we skip back to 0 since
660 * there are a number of places where the value
661 * of if_index or if_index itself is compared
662 * to or stored in an unsigned short. By
663 * jumping back, we won't botch those assignments
664 * or comparisons.
665 */
666 if (++if_index == 0) {
667 if_index = 1;
668 } else if (if_index == USHRT_MAX) {
669 /*
670 * However, if we have to jump back to
671 * zero *twice* without finding an empty
672 * slot in ifindex2ifnet[], then there
673 * there are too many (>65535) interfaces.
674 */
675 if (hitlimit)
676 panic("too many interfaces");
677 hitlimit = true;
678 if_index = 1;
679 }
680 ifp->if_index = if_index;
681 }
682 skip:
683 /*
684 * ifindex2ifnet is indexed by if_index. Since if_index will
685 * grow dynamically, it should grow too.
686 */
687 if (ifindex2ifnet == NULL || ifp->if_index >= if_indexlim) {
688 size_t m, n, oldlim;
689 void *q;
690
691 oldlim = if_indexlim;
692 while (ifp->if_index >= if_indexlim)
693 if_indexlim <<= 1;
694
695 /* grow ifindex2ifnet */
696 m = oldlim * sizeof(struct ifnet *);
697 n = if_indexlim * sizeof(struct ifnet *);
698 q = malloc(n, M_IFADDR, M_WAITOK | M_ZERO);
699 if (ifindex2ifnet != NULL) {
700 memcpy(q, ifindex2ifnet, m);
701 free(ifindex2ifnet, M_IFADDR);
702 }
703 ifindex2ifnet = (struct ifnet **)q;
704 }
705 ifindex2ifnet[ifp->if_index] = ifp;
706 }
707
708 /*
709 * Initialize an interface and assign an index for it.
710 *
711 * It must be called prior to a device specific attach routine
712 * (e.g., ether_ifattach and ieee80211_ifattach) or if_alloc_sadl,
713 * and be followed by if_register:
714 *
715 * if_initialize(ifp);
716 * ether_ifattach(ifp, enaddr);
717 * if_register(ifp);
718 */
719 void
720 if_initialize(ifnet_t *ifp)
721 {
722
723 KASSERT(if_indexlim > 0);
724 TAILQ_INIT(&ifp->if_addrlist);
725
726 /*
727 * Link level name is allocated later by a separate call to
728 * if_alloc_sadl().
729 */
730
731 if (ifp->if_snd.ifq_maxlen == 0)
732 ifp->if_snd.ifq_maxlen = ifqmaxlen;
733
734 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */
735
736 ifp->if_link_state = LINK_STATE_UNKNOWN;
737 ifp->if_link_queue = -1; /* all bits set, see link_state_change() */
738 ifp->if_link_scheduled = false;
739
740 ifp->if_capenable = 0;
741 ifp->if_csum_flags_tx = 0;
742 ifp->if_csum_flags_rx = 0;
743
744 #ifdef ALTQ
745 ifp->if_snd.altq_type = 0;
746 ifp->if_snd.altq_disc = NULL;
747 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE;
748 ifp->if_snd.altq_tbr = NULL;
749 ifp->if_snd.altq_ifp = ifp;
750 #endif
751
752 IFQ_LOCK_INIT(&ifp->if_snd);
753
754 ifp->if_pfil = pfil_head_create(PFIL_TYPE_IFNET, ifp);
755 pfil_run_ifhooks(if_pfil, PFIL_IFNET_ATTACH, ifp);
756
757 IF_AFDATA_LOCK_INIT(ifp);
758
759 PSLIST_ENTRY_INIT(ifp, if_pslist_entry);
760 PSLIST_INIT(&ifp->if_addr_pslist);
761 psref_target_init(&ifp->if_psref, ifnet_psref_class);
762 ifp->if_ioctl_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
763 LIST_INIT(&ifp->if_multiaddrs);
764 if_stats_init(ifp);
765
766 IFNET_GLOBAL_LOCK();
767 if_getindex(ifp);
768 IFNET_GLOBAL_UNLOCK();
769 }
770
771 /*
772 * Register an interface to the list of "active" interfaces.
773 */
774 void
775 if_register(ifnet_t *ifp)
776 {
777 /*
778 * If the driver has not supplied its own if_ioctl or if_stop,
779 * then supply the default.
780 */
781 if (ifp->if_ioctl == NULL)
782 ifp->if_ioctl = ifioctl_common;
783 if (ifp->if_stop == NULL)
784 ifp->if_stop = if_nullstop;
785
786 sysctl_sndq_setup(&ifp->if_sysctl_log, ifp->if_xname, &ifp->if_snd);
787
788 if (!STAILQ_EMPTY(&domains))
789 if_attachdomain1(ifp);
790
791 /* Announce the interface. */
792 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
793
794 if (ifp->if_slowtimo != NULL) {
795 struct if_slowtimo_data *isd;
796
797 isd = kmem_zalloc(sizeof(*isd), KM_SLEEP);
798 mutex_init(&isd->isd_lock, MUTEX_DEFAULT, IPL_SOFTCLOCK);
799 callout_init(&isd->isd_ch, CALLOUT_MPSAFE);
800 callout_setfunc(&isd->isd_ch, if_slowtimo_intr, ifp);
801 isd->isd_ifp = ifp;
802
803 ifp->if_slowtimo_data = isd;
804
805 if_slowtimo_intr(ifp);
806
807 sysctl_watchdog_setup(ifp);
808 }
809
810 if (ifp->if_transmit == NULL || ifp->if_transmit == if_nulltransmit)
811 ifp->if_transmit = if_transmit;
812
813 IFNET_GLOBAL_LOCK();
814 TAILQ_INSERT_TAIL(&ifnet_list, ifp, if_list);
815 IFNET_WRITER_INSERT_TAIL(ifp);
816 IFNET_GLOBAL_UNLOCK();
817 }
818
819 /*
820 * The if_percpuq framework
821 *
822 * It allows network device drivers to execute the network stack
823 * in softint (so called softint-based if_input). It utilizes
824 * softint and percpu ifqueue. It doesn't distribute any packets
825 * between CPUs, unlike pktqueue(9).
826 *
827 * Currently we support two options for device drivers to apply the framework:
828 * - Use it implicitly with less changes
829 * - If you use if_attach in driver's _attach function and if_input in
830 * driver's Rx interrupt handler, a packet is queued and a softint handles
831 * the packet implicitly
832 * - Use it explicitly in each driver (recommended)
833 * - You can use if_percpuq_* directly in your driver
834 * - In this case, you need to allocate struct if_percpuq in driver's softc
835 * - See wm(4) as a reference implementation
836 */
837
838 static void
839 if_percpuq_softint(void *arg)
840 {
841 struct if_percpuq *ipq = arg;
842 struct ifnet *ifp = ipq->ipq_ifp;
843 struct mbuf *m;
844
845 while ((m = if_percpuq_dequeue(ipq)) != NULL) {
846 if_statinc(ifp, if_ipackets);
847 bpf_mtap(ifp, m, BPF_D_IN);
848
849 ifp->_if_input(ifp, m);
850 }
851 }
852
853 static void
854 if_percpuq_init_ifq(void *p, void *arg __unused, struct cpu_info *ci __unused)
855 {
856 struct ifqueue *const ifq = p;
857
858 memset(ifq, 0, sizeof(*ifq));
859 ifq->ifq_maxlen = IFQ_MAXLEN;
860 }
861
862 struct if_percpuq *
863 if_percpuq_create(struct ifnet *ifp)
864 {
865 struct if_percpuq *ipq;
866 u_int flags = SOFTINT_NET;
867
868 flags |= if_is_mpsafe(ifp) ? SOFTINT_MPSAFE : 0;
869
870 ipq = kmem_zalloc(sizeof(*ipq), KM_SLEEP);
871 ipq->ipq_ifp = ifp;
872 ipq->ipq_si = softint_establish(flags, if_percpuq_softint, ipq);
873 ipq->ipq_ifqs = percpu_alloc(sizeof(struct ifqueue));
874 percpu_foreach(ipq->ipq_ifqs, &if_percpuq_init_ifq, NULL);
875
876 sysctl_percpuq_setup(&ifp->if_sysctl_log, ifp->if_xname, ipq);
877
878 return ipq;
879 }
880
881 static struct mbuf *
882 if_percpuq_dequeue(struct if_percpuq *ipq)
883 {
884 struct mbuf *m;
885 struct ifqueue *ifq;
886
887 const int s = splnet();
888 ifq = percpu_getref(ipq->ipq_ifqs);
889 IF_DEQUEUE(ifq, m);
890 percpu_putref(ipq->ipq_ifqs);
891 splx(s);
892
893 return m;
894 }
895
896 static void
897 if_percpuq_purge_ifq(void *p, void *arg __unused, struct cpu_info *ci __unused)
898 {
899 struct ifqueue *const ifq = p;
900
901 IF_PURGE(ifq);
902 }
903
904 void
905 if_percpuq_destroy(struct if_percpuq *ipq)
906 {
907
908 /* if_detach may already destroy it */
909 if (ipq == NULL)
910 return;
911
912 softint_disestablish(ipq->ipq_si);
913 percpu_foreach(ipq->ipq_ifqs, &if_percpuq_purge_ifq, NULL);
914 percpu_free(ipq->ipq_ifqs, sizeof(struct ifqueue));
915 kmem_free(ipq, sizeof(*ipq));
916 }
917
918 void
919 if_percpuq_enqueue(struct if_percpuq *ipq, struct mbuf *m)
920 {
921 struct ifqueue *ifq;
922
923 KASSERT(ipq != NULL);
924
925 const int s = splnet();
926 ifq = percpu_getref(ipq->ipq_ifqs);
927 if (IF_QFULL(ifq)) {
928 IF_DROP(ifq);
929 percpu_putref(ipq->ipq_ifqs);
930 m_freem(m);
931 goto out;
932 }
933 IF_ENQUEUE(ifq, m);
934 percpu_putref(ipq->ipq_ifqs);
935
936 softint_schedule(ipq->ipq_si);
937 out:
938 splx(s);
939 }
940
941 static void
942 if_percpuq_drops(void *p, void *arg, struct cpu_info *ci __unused)
943 {
944 struct ifqueue *const ifq = p;
945 uint64_t *sum = arg;
946
947 *sum += ifq->ifq_drops;
948 }
949
950 static int
951 sysctl_percpuq_drops_handler(SYSCTLFN_ARGS)
952 {
953 struct sysctlnode node;
954 struct if_percpuq *ipq;
955 uint64_t sum = 0;
956 int error;
957
958 node = *rnode;
959 ipq = node.sysctl_data;
960
961 percpu_foreach(ipq->ipq_ifqs, if_percpuq_drops, &sum);
962
963 node.sysctl_data = ∑
964 error = sysctl_lookup(SYSCTLFN_CALL(&node));
965 if (error != 0 || newp == NULL)
966 return error;
967
968 return 0;
969 }
970
971 static void
972 sysctl_percpuq_setup(struct sysctllog **clog, const char* ifname,
973 struct if_percpuq *ipq)
974 {
975 const struct sysctlnode *cnode, *rnode;
976
977 if (sysctl_createv(clog, 0, NULL, &rnode,
978 CTLFLAG_PERMANENT,
979 CTLTYPE_NODE, "interfaces",
980 SYSCTL_DESCR("Per-interface controls"),
981 NULL, 0, NULL, 0,
982 CTL_NET, CTL_CREATE, CTL_EOL) != 0)
983 goto bad;
984
985 if (sysctl_createv(clog, 0, &rnode, &rnode,
986 CTLFLAG_PERMANENT,
987 CTLTYPE_NODE, ifname,
988 SYSCTL_DESCR("Interface controls"),
989 NULL, 0, NULL, 0,
990 CTL_CREATE, CTL_EOL) != 0)
991 goto bad;
992
993 if (sysctl_createv(clog, 0, &rnode, &rnode,
994 CTLFLAG_PERMANENT,
995 CTLTYPE_NODE, "rcvq",
996 SYSCTL_DESCR("Interface input queue controls"),
997 NULL, 0, NULL, 0,
998 CTL_CREATE, CTL_EOL) != 0)
999 goto bad;
1000
1001 #ifdef NOTYET
1002 /* XXX Should show each per-CPU queue length? */
1003 if (sysctl_createv(clog, 0, &rnode, &rnode,
1004 CTLFLAG_PERMANENT,
1005 CTLTYPE_INT, "len",
1006 SYSCTL_DESCR("Current input queue length"),
1007 sysctl_percpuq_len, 0, NULL, 0,
1008 CTL_CREATE, CTL_EOL) != 0)
1009 goto bad;
1010
1011 if (sysctl_createv(clog, 0, &rnode, &cnode,
1012 CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
1013 CTLTYPE_INT, "maxlen",
1014 SYSCTL_DESCR("Maximum allowed input queue length"),
1015 sysctl_percpuq_maxlen_handler, 0, (void *)ipq, 0,
1016 CTL_CREATE, CTL_EOL) != 0)
1017 goto bad;
1018 #endif
1019
1020 if (sysctl_createv(clog, 0, &rnode, &cnode,
1021 CTLFLAG_PERMANENT,
1022 CTLTYPE_QUAD, "drops",
1023 SYSCTL_DESCR("Total packets dropped due to full input queue"),
1024 sysctl_percpuq_drops_handler, 0, (void *)ipq, 0,
1025 CTL_CREATE, CTL_EOL) != 0)
1026 goto bad;
1027
1028 return;
1029 bad:
1030 printf("%s: could not attach sysctl nodes\n", ifname);
1031 return;
1032 }
1033
1034 /*
1035 * The deferred if_start framework
1036 *
1037 * The common APIs to defer if_start to softint when if_start is requested
1038 * from a device driver running in hardware interrupt context.
1039 */
1040 /*
1041 * Call ifp->if_start (or equivalent) in a dedicated softint for
1042 * deferred if_start.
1043 */
1044 static void
1045 if_deferred_start_softint(void *arg)
1046 {
1047 struct if_deferred_start *ids = arg;
1048 struct ifnet *ifp = ids->ids_ifp;
1049
1050 ids->ids_if_start(ifp);
1051 }
1052
1053 /*
1054 * The default callback function for deferred if_start.
1055 */
1056 static void
1057 if_deferred_start_common(struct ifnet *ifp)
1058 {
1059 const int s = splnet();
1060 if_start_lock(ifp);
1061 splx(s);
1062 }
1063
1064 static inline bool
1065 if_snd_is_used(struct ifnet *ifp)
1066 {
1067
1068 return ALTQ_IS_ENABLED(&ifp->if_snd) ||
1069 ifp->if_transmit == if_transmit ||
1070 ifp->if_transmit == NULL ||
1071 ifp->if_transmit == if_nulltransmit;
1072 }
1073
1074 /*
1075 * Schedule deferred if_start.
1076 */
1077 void
1078 if_schedule_deferred_start(struct ifnet *ifp)
1079 {
1080
1081 KASSERT(ifp->if_deferred_start != NULL);
1082
1083 if (if_snd_is_used(ifp) && IFQ_IS_EMPTY(&ifp->if_snd))
1084 return;
1085
1086 softint_schedule(ifp->if_deferred_start->ids_si);
1087 }
1088
1089 /*
1090 * Create an instance of deferred if_start. A driver should call the function
1091 * only if the driver needs deferred if_start. Drivers can setup their own
1092 * deferred if_start function via 2nd argument.
1093 */
1094 void
1095 if_deferred_start_init(struct ifnet *ifp, void (*func)(struct ifnet *))
1096 {
1097 struct if_deferred_start *ids;
1098 u_int flags = SOFTINT_NET;
1099
1100 flags |= if_is_mpsafe(ifp) ? SOFTINT_MPSAFE : 0;
1101
1102 ids = kmem_zalloc(sizeof(*ids), KM_SLEEP);
1103 ids->ids_ifp = ifp;
1104 ids->ids_si = softint_establish(flags, if_deferred_start_softint, ids);
1105 if (func != NULL)
1106 ids->ids_if_start = func;
1107 else
1108 ids->ids_if_start = if_deferred_start_common;
1109
1110 ifp->if_deferred_start = ids;
1111 }
1112
1113 static void
1114 if_deferred_start_destroy(struct ifnet *ifp)
1115 {
1116
1117 if (ifp->if_deferred_start == NULL)
1118 return;
1119
1120 softint_disestablish(ifp->if_deferred_start->ids_si);
1121 kmem_free(ifp->if_deferred_start, sizeof(*ifp->if_deferred_start));
1122 ifp->if_deferred_start = NULL;
1123 }
1124
1125 /*
1126 * The common interface input routine that is called by device drivers,
1127 * which should be used only when the driver's rx handler already runs
1128 * in softint.
1129 */
1130 void
1131 if_input(struct ifnet *ifp, struct mbuf *m)
1132 {
1133
1134 KASSERT(ifp->if_percpuq == NULL);
1135 KASSERT(!cpu_intr_p());
1136
1137 if_statinc(ifp, if_ipackets);
1138 bpf_mtap(ifp, m, BPF_D_IN);
1139
1140 ifp->_if_input(ifp, m);
1141 }
1142
1143 /*
1144 * DEPRECATED. Use if_initialize and if_register instead.
1145 * See the above comment of if_initialize.
1146 *
1147 * Note that it implicitly enables if_percpuq to make drivers easy to
1148 * migrate softint-based if_input without much changes. If you don't
1149 * want to enable it, use if_initialize instead.
1150 */
1151 void
1152 if_attach(ifnet_t *ifp)
1153 {
1154
1155 if_initialize(ifp);
1156 ifp->if_percpuq = if_percpuq_create(ifp);
1157 if_register(ifp);
1158 }
1159
1160 void
1161 if_attachdomain(void)
1162 {
1163 struct ifnet *ifp;
1164 const int bound = curlwp_bind();
1165
1166 int s = pserialize_read_enter();
1167 IFNET_READER_FOREACH(ifp) {
1168 struct psref psref;
1169 psref_acquire(&psref, &ifp->if_psref, ifnet_psref_class);
1170 pserialize_read_exit(s);
1171 if_attachdomain1(ifp);
1172 s = pserialize_read_enter();
1173 psref_release(&psref, &ifp->if_psref, ifnet_psref_class);
1174 }
1175 pserialize_read_exit(s);
1176 curlwp_bindx(bound);
1177 }
1178
1179 static void
1180 if_attachdomain1(struct ifnet *ifp)
1181 {
1182 struct domain *dp;
1183 const int s = splsoftnet();
1184
1185 /* address family dependent data region */
1186 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata));
1187 DOMAIN_FOREACH(dp) {
1188 if (dp->dom_ifattach != NULL)
1189 ifp->if_afdata[dp->dom_family] =
1190 (*dp->dom_ifattach)(ifp);
1191 }
1192
1193 splx(s);
1194 }
1195
1196 /*
1197 * Deactivate an interface. This points all of the procedure
1198 * handles at error stubs. May be called from interrupt context.
1199 */
1200 void
1201 if_deactivate(struct ifnet *ifp)
1202 {
1203 const int s = splsoftnet();
1204
1205 ifp->if_output = if_nulloutput;
1206 ifp->_if_input = if_nullinput;
1207 ifp->if_start = if_nullstart;
1208 ifp->if_transmit = if_nulltransmit;
1209 ifp->if_ioctl = if_nullioctl;
1210 ifp->if_init = if_nullinit;
1211 ifp->if_stop = if_nullstop;
1212 if (ifp->if_slowtimo)
1213 ifp->if_slowtimo = if_nullslowtimo;
1214 ifp->if_drain = if_nulldrain;
1215
1216 /* No more packets may be enqueued. */
1217 ifp->if_snd.ifq_maxlen = 0;
1218
1219 splx(s);
1220 }
1221
1222 bool
1223 if_is_deactivated(const struct ifnet *ifp)
1224 {
1225
1226 return ifp->if_output == if_nulloutput;
1227 }
1228
1229 void
1230 if_purgeaddrs(struct ifnet *ifp, int family,
1231 void (*purgeaddr)(struct ifaddr *))
1232 {
1233 struct ifaddr *ifa, *nifa;
1234 int s;
1235
1236 s = pserialize_read_enter();
1237 for (ifa = IFADDR_READER_FIRST(ifp); ifa; ifa = nifa) {
1238 nifa = IFADDR_READER_NEXT(ifa);
1239 if (ifa->ifa_addr->sa_family != family)
1240 continue;
1241 pserialize_read_exit(s);
1242
1243 (*purgeaddr)(ifa);
1244
1245 s = pserialize_read_enter();
1246 }
1247 pserialize_read_exit(s);
1248 }
1249
1250 #ifdef IFAREF_DEBUG
1251 static struct ifaddr **ifa_list;
1252 static int ifa_list_size;
1253
1254 /* Depends on only one if_attach runs at once */
1255 static void
1256 if_build_ifa_list(struct ifnet *ifp)
1257 {
1258 struct ifaddr *ifa;
1259 int i;
1260
1261 KASSERT(ifa_list == NULL);
1262 KASSERT(ifa_list_size == 0);
1263
1264 IFADDR_READER_FOREACH(ifa, ifp)
1265 ifa_list_size++;
1266
1267 ifa_list = kmem_alloc(sizeof(*ifa) * ifa_list_size, KM_SLEEP);
1268 i = 0;
1269 IFADDR_READER_FOREACH(ifa, ifp) {
1270 ifa_list[i++] = ifa;
1271 ifaref(ifa);
1272 }
1273 }
1274
1275 static void
1276 if_check_and_free_ifa_list(struct ifnet *ifp)
1277 {
1278 int i;
1279 struct ifaddr *ifa;
1280
1281 if (ifa_list == NULL)
1282 return;
1283
1284 for (i = 0; i < ifa_list_size; i++) {
1285 char buf[64];
1286
1287 ifa = ifa_list[i];
1288 sockaddr_format(ifa->ifa_addr, buf, sizeof(buf));
1289 if (ifa->ifa_refcnt > 1) {
1290 log(LOG_WARNING,
1291 "ifa(%s) still referenced (refcnt=%d)\n",
1292 buf, ifa->ifa_refcnt - 1);
1293 } else
1294 log(LOG_DEBUG,
1295 "ifa(%s) not referenced (refcnt=%d)\n",
1296 buf, ifa->ifa_refcnt - 1);
1297 ifafree(ifa);
1298 }
1299
1300 kmem_free(ifa_list, sizeof(*ifa) * ifa_list_size);
1301 ifa_list = NULL;
1302 ifa_list_size = 0;
1303 }
1304 #endif
1305
1306 /*
1307 * Detach an interface from the list of "active" interfaces,
1308 * freeing any resources as we go along.
1309 *
1310 * NOTE: This routine must be called with a valid thread context,
1311 * as it may block.
1312 */
1313 void
1314 if_detach(struct ifnet *ifp)
1315 {
1316 struct socket so;
1317 struct ifaddr *ifa;
1318 #ifdef IFAREF_DEBUG
1319 struct ifaddr *last_ifa = NULL;
1320 #endif
1321 struct domain *dp;
1322 const struct protosw *pr;
1323 int i, family, purged;
1324
1325 #ifdef IFAREF_DEBUG
1326 if_build_ifa_list(ifp);
1327 #endif
1328 /*
1329 * XXX It's kind of lame that we have to have the
1330 * XXX socket structure...
1331 */
1332 memset(&so, 0, sizeof(so));
1333
1334 const int s = splnet();
1335
1336 sysctl_teardown(&ifp->if_sysctl_log);
1337
1338 IFNET_LOCK(ifp);
1339
1340 /*
1341 * Unset all queued link states and pretend a
1342 * link state change is scheduled.
1343 * This stops any more link state changes occurring for this
1344 * interface while it's being detached so it's safe
1345 * to drain the workqueue.
1346 */
1347 IF_LINK_STATE_CHANGE_LOCK(ifp);
1348 ifp->if_link_queue = -1; /* all bits set, see link_state_change() */
1349 ifp->if_link_scheduled = true;
1350 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
1351 workqueue_wait(ifnet_link_state_wq, &ifp->if_link_work);
1352
1353 if_deactivate(ifp);
1354 IFNET_UNLOCK(ifp);
1355
1356 /*
1357 * Unlink from the list and wait for all readers to leave
1358 * from pserialize read sections. Note that we can't do
1359 * psref_target_destroy here. See below.
1360 */
1361 IFNET_GLOBAL_LOCK();
1362 ifindex2ifnet[ifp->if_index] = NULL;
1363 TAILQ_REMOVE(&ifnet_list, ifp, if_list);
1364 IFNET_WRITER_REMOVE(ifp);
1365 pserialize_perform(ifnet_psz);
1366 IFNET_GLOBAL_UNLOCK();
1367
1368 if (ifp->if_slowtimo != NULL) {
1369 struct if_slowtimo_data *isd = ifp->if_slowtimo_data;
1370
1371 mutex_enter(&isd->isd_lock);
1372 isd->isd_dying = true;
1373 mutex_exit(&isd->isd_lock);
1374 callout_halt(&isd->isd_ch, NULL);
1375 workqueue_wait(if_slowtimo_wq, &isd->isd_work);
1376 callout_destroy(&isd->isd_ch);
1377 mutex_destroy(&isd->isd_lock);
1378 kmem_free(isd, sizeof(*isd));
1379
1380 ifp->if_slowtimo_data = NULL; /* paraonia */
1381 ifp->if_slowtimo = NULL; /* paranoia */
1382 }
1383 if_deferred_start_destroy(ifp);
1384
1385 /*
1386 * Do an if_down() to give protocols a chance to do something.
1387 */
1388 if_down_deactivated(ifp);
1389
1390 #ifdef ALTQ
1391 if (ALTQ_IS_ENABLED(&ifp->if_snd))
1392 altq_disable(&ifp->if_snd);
1393 if (ALTQ_IS_ATTACHED(&ifp->if_snd))
1394 altq_detach(&ifp->if_snd);
1395 #endif
1396
1397 #if NCARP > 0
1398 /* Remove the interface from any carp group it is a part of. */
1399 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP)
1400 carp_ifdetach(ifp);
1401 #endif
1402
1403 /*
1404 * Ensure that all packets on protocol input pktqueues have been
1405 * processed, or, at least, removed from the queues.
1406 *
1407 * A cross-call will ensure that the interrupts have completed.
1408 * FIXME: not quite..
1409 */
1410 pktq_ifdetach();
1411 xc_barrier(0);
1412
1413 /*
1414 * Rip all the addresses off the interface. This should make
1415 * all of the routes go away.
1416 *
1417 * pr_usrreq calls can remove an arbitrary number of ifaddrs
1418 * from the list, including our "cursor", ifa. For safety,
1419 * and to honor the TAILQ abstraction, I just restart the
1420 * loop after each removal. Note that the loop will exit
1421 * when all of the remaining ifaddrs belong to the AF_LINK
1422 * family. I am counting on the historical fact that at
1423 * least one pr_usrreq in each address domain removes at
1424 * least one ifaddr.
1425 */
1426 again:
1427 /*
1428 * At this point, no other one tries to remove ifa in the list,
1429 * so we don't need to take a lock or psref. Avoid using
1430 * IFADDR_READER_FOREACH to pass over an inspection of contract
1431 * violations of pserialize.
1432 */
1433 IFADDR_WRITER_FOREACH(ifa, ifp) {
1434 family = ifa->ifa_addr->sa_family;
1435 #ifdef IFAREF_DEBUG
1436 printf("if_detach: ifaddr %p, family %d, refcnt %d\n",
1437 ifa, family, ifa->ifa_refcnt);
1438 if (last_ifa != NULL && ifa == last_ifa)
1439 panic("if_detach: loop detected");
1440 last_ifa = ifa;
1441 #endif
1442 if (family == AF_LINK)
1443 continue;
1444 dp = pffinddomain(family);
1445 KASSERTMSG(dp != NULL, "no domain for AF %d", family);
1446 /*
1447 * XXX These PURGEIF calls are redundant with the
1448 * purge-all-families calls below, but are left in for
1449 * now both to make a smaller change, and to avoid
1450 * unplanned interactions with clearing of
1451 * ifp->if_addrlist.
1452 */
1453 purged = 0;
1454 for (pr = dp->dom_protosw;
1455 pr < dp->dom_protoswNPROTOSW; pr++) {
1456 so.so_proto = pr;
1457 if (pr->pr_usrreqs) {
1458 (void) (*pr->pr_usrreqs->pr_purgeif)(&so, ifp);
1459 purged = 1;
1460 }
1461 }
1462 if (purged == 0) {
1463 /*
1464 * XXX What's really the best thing to do
1465 * XXX here? --thorpej@NetBSD.org
1466 */
1467 printf("if_detach: WARNING: AF %d not purged\n",
1468 family);
1469 ifa_remove(ifp, ifa);
1470 }
1471 goto again;
1472 }
1473
1474 if_free_sadl(ifp, 1);
1475
1476 restart:
1477 IFADDR_WRITER_FOREACH(ifa, ifp) {
1478 family = ifa->ifa_addr->sa_family;
1479 KASSERT(family == AF_LINK);
1480 ifa_remove(ifp, ifa);
1481 goto restart;
1482 }
1483
1484 /* Delete stray routes from the routing table. */
1485 for (i = 0; i <= AF_MAX; i++)
1486 rt_delete_matched_entries(i, if_delroute_matcher, ifp, false);
1487
1488 DOMAIN_FOREACH(dp) {
1489 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family])
1490 {
1491 void *p = ifp->if_afdata[dp->dom_family];
1492 if (p) {
1493 ifp->if_afdata[dp->dom_family] = NULL;
1494 (*dp->dom_ifdetach)(ifp, p);
1495 }
1496 }
1497
1498 /*
1499 * One would expect multicast memberships (INET and
1500 * INET6) on UDP sockets to be purged by the PURGEIF
1501 * calls above, but if all addresses were removed from
1502 * the interface prior to destruction, the calls will
1503 * not be made (e.g. ppp, for which pppd(8) generally
1504 * removes addresses before destroying the interface).
1505 * Because there is no invariant that multicast
1506 * memberships only exist for interfaces with IPv4
1507 * addresses, we must call PURGEIF regardless of
1508 * addresses. (Protocols which might store ifnet
1509 * pointers are marked with PR_PURGEIF.)
1510 */
1511 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
1512 {
1513 so.so_proto = pr;
1514 if (pr->pr_usrreqs && pr->pr_flags & PR_PURGEIF)
1515 (void)(*pr->pr_usrreqs->pr_purgeif)(&so, ifp);
1516 }
1517 }
1518
1519 /*
1520 * Must be done after the above pr_purgeif because if_psref may be
1521 * still used in pr_purgeif.
1522 */
1523 psref_target_destroy(&ifp->if_psref, ifnet_psref_class);
1524 PSLIST_ENTRY_DESTROY(ifp, if_pslist_entry);
1525
1526 pfil_run_ifhooks(if_pfil, PFIL_IFNET_DETACH, ifp);
1527 (void)pfil_head_destroy(ifp->if_pfil);
1528
1529 /* Announce that the interface is gone. */
1530 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1531
1532 IF_AFDATA_LOCK_DESTROY(ifp);
1533
1534 if (ifp->if_percpuq != NULL) {
1535 if_percpuq_destroy(ifp->if_percpuq);
1536 ifp->if_percpuq = NULL;
1537 }
1538
1539 mutex_obj_free(ifp->if_ioctl_lock);
1540 ifp->if_ioctl_lock = NULL;
1541 mutex_obj_free(ifp->if_snd.ifq_lock);
1542 if_stats_fini(ifp);
1543 KASSERT(!simplehook_has_hooks(ifp->if_linkstate_hooks));
1544 simplehook_destroy(ifp->if_linkstate_hooks);
1545
1546 splx(s);
1547
1548 #ifdef IFAREF_DEBUG
1549 if_check_and_free_ifa_list(ifp);
1550 #endif
1551 }
1552
1553 /*
1554 * Callback for a radix tree walk to delete all references to an
1555 * ifnet.
1556 */
1557 static int
1558 if_delroute_matcher(struct rtentry *rt, void *v)
1559 {
1560 struct ifnet *ifp = (struct ifnet *)v;
1561
1562 if (rt->rt_ifp == ifp)
1563 return 1;
1564 else
1565 return 0;
1566 }
1567
1568 /*
1569 * Create a clone network interface.
1570 */
1571 static int
1572 if_clone_create(const char *name)
1573 {
1574 struct if_clone *ifc;
1575 struct ifnet *ifp;
1576 struct psref psref;
1577 int unit;
1578
1579 KASSERT(mutex_owned(&if_clone_mtx));
1580
1581 ifc = if_clone_lookup(name, &unit);
1582 if (ifc == NULL)
1583 return EINVAL;
1584
1585 ifp = if_get(name, &psref);
1586 if (ifp != NULL) {
1587 if_put(ifp, &psref);
1588 return EEXIST;
1589 }
1590
1591 return (*ifc->ifc_create)(ifc, unit);
1592 }
1593
1594 /*
1595 * Destroy a clone network interface.
1596 */
1597 static int
1598 if_clone_destroy(const char *name)
1599 {
1600 struct if_clone *ifc;
1601 struct ifnet *ifp;
1602 struct psref psref;
1603 int error;
1604 int (*if_ioctlfn)(struct ifnet *, u_long, void *);
1605
1606 KASSERT(mutex_owned(&if_clone_mtx));
1607
1608 ifc = if_clone_lookup(name, NULL);
1609 if (ifc == NULL)
1610 return EINVAL;
1611
1612 if (ifc->ifc_destroy == NULL)
1613 return EOPNOTSUPP;
1614
1615 ifp = if_get(name, &psref);
1616 if (ifp == NULL)
1617 return ENXIO;
1618
1619 /* We have to disable ioctls here */
1620 IFNET_LOCK(ifp);
1621 if_ioctlfn = ifp->if_ioctl;
1622 ifp->if_ioctl = if_nullioctl;
1623 IFNET_UNLOCK(ifp);
1624
1625 /*
1626 * We cannot call ifc_destroy with holding ifp.
1627 * Releasing ifp here is safe thanks to if_clone_mtx.
1628 */
1629 if_put(ifp, &psref);
1630
1631 error = (*ifc->ifc_destroy)(ifp);
1632
1633 if (error != 0) {
1634 /* We have to restore if_ioctl on error */
1635 IFNET_LOCK(ifp);
1636 ifp->if_ioctl = if_ioctlfn;
1637 IFNET_UNLOCK(ifp);
1638 }
1639
1640 return error;
1641 }
1642
1643 static bool
1644 if_is_unit(const char *name)
1645 {
1646
1647 while (*name != '\0') {
1648 if (*name < '' || *name > '9')
1649 return false;
1650 name++;
1651 }
1652
1653 return true;
1654 }
1655
1656 /*
1657 * Look up a network interface cloner.
1658 */
1659 static struct if_clone *
1660 if_clone_lookup(const char *name, int *unitp)
1661 {
1662 struct if_clone *ifc;
1663 const char *cp;
1664 char *dp, ifname[IFNAMSIZ + 3];
1665 int unit;
1666
1667 KASSERT(mutex_owned(&if_clone_mtx));
1668
1669 strcpy(ifname, "if_");
1670 /* separate interface name from unit */
1671 /* TODO: search unit number from backward */
1672 for (dp = ifname + 3, cp = name; cp - name < IFNAMSIZ &&
1673 *cp && !if_is_unit(cp);)
1674 *dp++ = *cp++;
1675
1676 if (cp == name || cp - name == IFNAMSIZ || !*cp)
1677 return NULL; /* No name or unit number */
1678 *dp++ = '\0';
1679
1680 again:
1681 LIST_FOREACH(ifc, &if_cloners, ifc_list) {
1682 if (strcmp(ifname + 3, ifc->ifc_name) == 0)
1683 break;
1684 }
1685
1686 if (ifc == NULL) {
1687 int error;
1688 if (*ifname == '\0')
1689 return NULL;
1690 mutex_exit(&if_clone_mtx);
1691 error = module_autoload(ifname, MODULE_CLASS_DRIVER);
1692 mutex_enter(&if_clone_mtx);
1693 if (error)
1694 return NULL;
1695 *ifname = '\0';
1696 goto again;
1697 }
1698
1699 unit = 0;
1700 while (cp - name < IFNAMSIZ && *cp) {
1701 if (*cp < '' || *cp > '9' || unit >= INT_MAX / 10) {
1702 /* Bogus unit number. */
1703 return NULL;
1704 }
1705 unit = (unit * 10) + (*cp++ - '');
1706 }
1707
1708 if (unitp != NULL)
1709 *unitp = unit;
1710 return ifc;
1711 }
1712
1713 /*
1714 * Register a network interface cloner.
1715 */
1716 void
1717 if_clone_attach(struct if_clone *ifc)
1718 {
1719
1720 mutex_enter(&if_clone_mtx);
1721 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
1722 if_cloners_count++;
1723 mutex_exit(&if_clone_mtx);
1724 }
1725
1726 /*
1727 * Unregister a network interface cloner.
1728 */
1729 void
1730 if_clone_detach(struct if_clone *ifc)
1731 {
1732
1733 mutex_enter(&if_clone_mtx);
1734 LIST_REMOVE(ifc, ifc_list);
1735 if_cloners_count--;
1736 mutex_exit(&if_clone_mtx);
1737 }
1738
1739 /*
1740 * Provide list of interface cloners to userspace.
1741 */
1742 int
1743 if_clone_list(int buf_count, char *buffer, int *total)
1744 {
1745 char outbuf[IFNAMSIZ], *dst;
1746 struct if_clone *ifc;
1747 int count, error = 0;
1748
1749 mutex_enter(&if_clone_mtx);
1750 *total = if_cloners_count;
1751 if ((dst = buffer) == NULL) {
1752 /* Just asking how many there are. */
1753 goto out;
1754 }
1755
1756 if (buf_count < 0) {
1757 error = EINVAL;
1758 goto out;
1759 }
1760
1761 count = (if_cloners_count < buf_count) ? if_cloners_count : buf_count;
1762
1763 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
1764 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
1765 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf));
1766 if (outbuf[sizeof(outbuf) - 1] != '\0') {
1767 error = ENAMETOOLONG;
1768 goto out;
1769 }
1770 error = copyout(outbuf, dst, sizeof(outbuf));
1771 if (error != 0)
1772 break;
1773 }
1774
1775 out:
1776 mutex_exit(&if_clone_mtx);
1777 return error;
1778 }
1779
1780 void
1781 ifa_psref_init(struct ifaddr *ifa)
1782 {
1783
1784 psref_target_init(&ifa->ifa_psref, ifa_psref_class);
1785 }
1786
1787 void
1788 ifaref(struct ifaddr *ifa)
1789 {
1790
1791 atomic_inc_uint(&ifa->ifa_refcnt);
1792 }
1793
1794 void
1795 ifafree(struct ifaddr *ifa)
1796 {
1797 KASSERT(ifa != NULL);
1798 KASSERTMSG(ifa->ifa_refcnt > 0, "ifa_refcnt=%d", ifa->ifa_refcnt);
1799
1800 #ifndef __HAVE_ATOMIC_AS_MEMBAR
1801 membar_release();
1802 #endif
1803 if (atomic_dec_uint_nv(&ifa->ifa_refcnt) != 0)
1804 return;
1805 #ifndef __HAVE_ATOMIC_AS_MEMBAR
1806 membar_acquire();
1807 #endif
1808 free(ifa, M_IFADDR);
1809 }
1810
1811 bool
1812 ifa_is_destroying(struct ifaddr *ifa)
1813 {
1814
1815 return ISSET(ifa->ifa_flags, IFA_DESTROYING);
1816 }
1817
1818 void
1819 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa)
1820 {
1821
1822 ifa->ifa_ifp = ifp;
1823
1824 /*
1825 * Check MP-safety for IFEF_MPSAFE drivers.
1826 * Check !IFF_RUNNING for initialization routines that normally don't
1827 * take IFNET_LOCK but it's safe because there is no competitor.
1828 * XXX there are false positive cases because IFF_RUNNING can be off on
1829 * if_stop.
1830 */
1831 KASSERT(!if_is_mpsafe(ifp) || !ISSET(ifp->if_flags, IFF_RUNNING) ||
1832 IFNET_LOCKED(ifp));
1833
1834 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list);
1835 IFADDR_ENTRY_INIT(ifa);
1836 IFADDR_WRITER_INSERT_TAIL(ifp, ifa);
1837
1838 ifaref(ifa);
1839 }
1840
1841 void
1842 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa)
1843 {
1844
1845 KASSERT(ifa->ifa_ifp == ifp);
1846 /*
1847 * Check MP-safety for IFEF_MPSAFE drivers.
1848 * if_is_deactivated indicates ifa_remove is called from if_detach
1849 * where it is safe even if IFNET_LOCK isn't held.
1850 */
1851 KASSERT(!if_is_mpsafe(ifp) || if_is_deactivated(ifp) ||
1852 IFNET_LOCKED(ifp));
1853
1854 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list);
1855 IFADDR_WRITER_REMOVE(ifa);
1856 #ifdef NET_MPSAFE
1857 IFNET_GLOBAL_LOCK();
1858 pserialize_perform(ifnet_psz);
1859 IFNET_GLOBAL_UNLOCK();
1860 #endif
1861
1862 #ifdef NET_MPSAFE
1863 psref_target_destroy(&ifa->ifa_psref, ifa_psref_class);
1864 #endif
1865 IFADDR_ENTRY_DESTROY(ifa);
1866 ifafree(ifa);
1867 }
1868
1869 void
1870 ifa_acquire(struct ifaddr *ifa, struct psref *psref)
1871 {
1872
1873 PSREF_DEBUG_FILL_RETURN_ADDRESS(psref);
1874 psref_acquire(psref, &ifa->ifa_psref, ifa_psref_class);
1875 }
1876
1877 void
1878 ifa_release(struct ifaddr *ifa, struct psref *psref)
1879 {
1880
1881 if (ifa == NULL)
1882 return;
1883
1884 psref_release(psref, &ifa->ifa_psref, ifa_psref_class);
1885 }
1886
1887 bool
1888 ifa_held(struct ifaddr *ifa)
1889 {
1890
1891 return psref_held(&ifa->ifa_psref, ifa_psref_class);
1892 }
1893
1894 static inline int
1895 equal(const struct sockaddr *sa1, const struct sockaddr *sa2)
1896 {
1897
1898 return sockaddr_cmp(sa1, sa2) == 0;
1899 }
1900
1901 /*
1902 * Locate an interface based on a complete address.
1903 */
1904 /*ARGSUSED*/
1905 struct ifaddr *
1906 ifa_ifwithaddr(const struct sockaddr *addr)
1907 {
1908 struct ifnet *ifp;
1909 struct ifaddr *ifa;
1910
1911 IFNET_READER_FOREACH(ifp) {
1912 if (if_is_deactivated(ifp))
1913 continue;
1914 IFADDR_READER_FOREACH(ifa, ifp) {
1915 if (ifa->ifa_addr->sa_family != addr->sa_family)
1916 continue;
1917 if (equal(addr, ifa->ifa_addr))
1918 return ifa;
1919 if ((ifp->if_flags & IFF_BROADCAST) &&
1920 ifa->ifa_broadaddr &&
1921 /* IP6 doesn't have broadcast */
1922 ifa->ifa_broadaddr->sa_len != 0 &&
1923 equal(ifa->ifa_broadaddr, addr))
1924 return ifa;
1925 }
1926 }
1927 return NULL;
1928 }
1929
1930 struct ifaddr *
1931 ifa_ifwithaddr_psref(const struct sockaddr *addr, struct psref *psref)
1932 {
1933 struct ifaddr *ifa;
1934 int s = pserialize_read_enter();
1935
1936 ifa = ifa_ifwithaddr(addr);
1937 if (ifa != NULL)
1938 ifa_acquire(ifa, psref);
1939 pserialize_read_exit(s);
1940
1941 return ifa;
1942 }
1943
1944 /*
1945 * Locate the point to point interface with a given destination address.
1946 */
1947 /*ARGSUSED*/
1948 struct ifaddr *
1949 ifa_ifwithdstaddr(const struct sockaddr *addr)
1950 {
1951 struct ifnet *ifp;
1952 struct ifaddr *ifa;
1953
1954 IFNET_READER_FOREACH(ifp) {
1955 if (if_is_deactivated(ifp))
1956 continue;
1957 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1958 continue;
1959 IFADDR_READER_FOREACH(ifa, ifp) {
1960 if (ifa->ifa_addr->sa_family != addr->sa_family ||
1961 ifa->ifa_dstaddr == NULL)
1962 continue;
1963 if (equal(addr, ifa->ifa_dstaddr))
1964 return ifa;
1965 }
1966 }
1967
1968 return NULL;
1969 }
1970
1971 struct ifaddr *
1972 ifa_ifwithdstaddr_psref(const struct sockaddr *addr, struct psref *psref)
1973 {
1974 struct ifaddr *ifa;
1975 int s;
1976
1977 s = pserialize_read_enter();
1978 ifa = ifa_ifwithdstaddr(addr);
1979 if (ifa != NULL)
1980 ifa_acquire(ifa, psref);
1981 pserialize_read_exit(s);
1982
1983 return ifa;
1984 }
1985
1986 /*
1987 * Find an interface on a specific network. If many, choice
1988 * is most specific found.
1989 */
1990 struct ifaddr *
1991 ifa_ifwithnet(const struct sockaddr *addr)
1992 {
1993 struct ifnet *ifp;
1994 struct ifaddr *ifa, *ifa_maybe = NULL;
1995 const struct sockaddr_dl *sdl;
1996 u_int af = addr->sa_family;
1997 const char *addr_data = addr->sa_data, *cplim;
1998
1999 if (af == AF_LINK) {
2000 sdl = satocsdl(addr);
2001 if (sdl->sdl_index && sdl->sdl_index < if_indexlim &&
2002 ifindex2ifnet[sdl->sdl_index] &&
2003 !if_is_deactivated(ifindex2ifnet[sdl->sdl_index])) {
2004 return ifindex2ifnet[sdl->sdl_index]->if_dl;
2005 }
2006 }
2007 #ifdef NETATALK
2008 if (af == AF_APPLETALK) {
2009 const struct sockaddr_at *sat, *sat2;
2010 sat = (const struct sockaddr_at *)addr;
2011 IFNET_READER_FOREACH(ifp) {
2012 if (if_is_deactivated(ifp))
2013 continue;
2014 ifa = at_ifawithnet((const struct sockaddr_at *)addr,
2015 ifp);
2016 if (ifa == NULL)
2017 continue;
2018 sat2 = (struct sockaddr_at *)ifa->ifa_addr;
2019 if (sat2->sat_addr.s_net == sat->sat_addr.s_net)
2020 return ifa; /* exact match */
2021 if (ifa_maybe == NULL) {
2022 /* else keep the if with the right range */
2023 ifa_maybe = ifa;
2024 }
2025 }
2026 return ifa_maybe;
2027 }
2028 #endif
2029 IFNET_READER_FOREACH(ifp) {
2030 if (if_is_deactivated(ifp))
2031 continue;
2032 IFADDR_READER_FOREACH(ifa, ifp) {
2033 const char *cp, *cp2, *cp3;
2034
2035 if (ifa->ifa_addr->sa_family != af ||
2036 ifa->ifa_netmask == NULL)
2037 next: continue;
2038 cp = addr_data;
2039 cp2 = ifa->ifa_addr->sa_data;
2040 cp3 = ifa->ifa_netmask->sa_data;
2041 cplim = (const char *)ifa->ifa_netmask +
2042 ifa->ifa_netmask->sa_len;
2043 while (cp3 < cplim) {
2044 if ((*cp++ ^ *cp2++) & *cp3++) {
2045 /* want to continue for() loop */
2046 goto next;
2047 }
2048 }
2049 if (ifa_maybe == NULL ||
2050 rt_refines(ifa->ifa_netmask,
2051 ifa_maybe->ifa_netmask))
2052 ifa_maybe = ifa;
2053 }
2054 }
2055 return ifa_maybe;
2056 }
2057
2058 struct ifaddr *
2059 ifa_ifwithnet_psref(const struct sockaddr *addr, struct psref *psref)
2060 {
2061 struct ifaddr *ifa;
2062 int s;
2063
2064 s = pserialize_read_enter();
2065 ifa = ifa_ifwithnet(addr);
2066 if (ifa != NULL)
2067 ifa_acquire(ifa, psref);
2068 pserialize_read_exit(s);
2069
2070 return ifa;
2071 }
2072
2073 /*
2074 * Find the interface of the address.
2075 */
2076 struct ifaddr *
2077 ifa_ifwithladdr(const struct sockaddr *addr)
2078 {
2079 struct ifaddr *ia;
2080
2081 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) ||
2082 (ia = ifa_ifwithnet(addr)))
2083 return ia;
2084 return NULL;
2085 }
2086
2087 struct ifaddr *
2088 ifa_ifwithladdr_psref(const struct sockaddr *addr, struct psref *psref)
2089 {
2090 struct ifaddr *ifa;
2091 int s;
2092
2093 s = pserialize_read_enter();
2094 ifa = ifa_ifwithladdr(addr);
2095 if (ifa != NULL)
2096 ifa_acquire(ifa, psref);
2097 pserialize_read_exit(s);
2098
2099 return ifa;
2100 }
2101
2102 /*
2103 * Find an interface using a specific address family
2104 */
2105 struct ifaddr *
2106 ifa_ifwithaf(int af)
2107 {
2108 struct ifnet *ifp;
2109 struct ifaddr *ifa = NULL;
2110 int s;
2111
2112 s = pserialize_read_enter();
2113 IFNET_READER_FOREACH(ifp) {
2114 if (if_is_deactivated(ifp))
2115 continue;
2116 IFADDR_READER_FOREACH(ifa, ifp) {
2117 if (ifa->ifa_addr->sa_family == af)
2118 goto out;
2119 }
2120 }
2121 out:
2122 pserialize_read_exit(s);
2123 return ifa;
2124 }
2125
2126 /*
2127 * Find an interface address specific to an interface best matching
2128 * a given address.
2129 */
2130 struct ifaddr *
2131 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp)
2132 {
2133 struct ifaddr *ifa;
2134 const char *cp, *cp2, *cp3;
2135 const char *cplim;
2136 struct ifaddr *ifa_maybe = 0;
2137 u_int af = addr->sa_family;
2138
2139 if (if_is_deactivated(ifp))
2140 return NULL;
2141
2142 if (af >= AF_MAX)
2143 return NULL;
2144
2145 IFADDR_READER_FOREACH(ifa, ifp) {
2146 if (ifa->ifa_addr->sa_family != af)
2147 continue;
2148 ifa_maybe = ifa;
2149 if (ifa->ifa_netmask == NULL) {
2150 if (equal(addr, ifa->ifa_addr) ||
2151 (ifa->ifa_dstaddr &&
2152 equal(addr, ifa->ifa_dstaddr)))
2153 return ifa;
2154 continue;
2155 }
2156 cp = addr->sa_data;
2157 cp2 = ifa->ifa_addr->sa_data;
2158 cp3 = ifa->ifa_netmask->sa_data;
2159 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
2160 for (; cp3 < cplim; cp3++) {
2161 if ((*cp++ ^ *cp2++) & *cp3)
2162 break;
2163 }
2164 if (cp3 == cplim)
2165 return ifa;
2166 }
2167 return ifa_maybe;
2168 }
2169
2170 struct ifaddr *
2171 ifaof_ifpforaddr_psref(const struct sockaddr *addr, struct ifnet *ifp,
2172 struct psref *psref)
2173 {
2174 struct ifaddr *ifa;
2175 int s;
2176
2177 s = pserialize_read_enter();
2178 ifa = ifaof_ifpforaddr(addr, ifp);
2179 if (ifa != NULL)
2180 ifa_acquire(ifa, psref);
2181 pserialize_read_exit(s);
2182
2183 return ifa;
2184 }
2185
2186 /*
2187 * Default action when installing a route with a Link Level gateway.
2188 * Lookup an appropriate real ifa to point to.
2189 * This should be moved to /sys/net/link.c eventually.
2190 */
2191 void
2192 link_rtrequest(int cmd, struct rtentry *rt, const struct rt_addrinfo *info)
2193 {
2194 struct ifaddr *ifa;
2195 const struct sockaddr *dst;
2196 struct ifnet *ifp;
2197 struct psref psref;
2198
2199 if (cmd != RTM_ADD || ISSET(info->rti_flags, RTF_DONTCHANGEIFA))
2200 return;
2201 ifp = rt->rt_ifa->ifa_ifp;
2202 dst = rt_getkey(rt);
2203 if ((ifa = ifaof_ifpforaddr_psref(dst, ifp, &psref)) != NULL) {
2204 rt_replace_ifa(rt, ifa);
2205 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
2206 ifa->ifa_rtrequest(cmd, rt, info);
2207 ifa_release(ifa, &psref);
2208 }
2209 }
2210
2211 /*
2212 * bitmask macros to manage a densely packed link_state change queue.
2213 * Because we need to store LINK_STATE_UNKNOWN(0), LINK_STATE_DOWN(1) and
2214 * LINK_STATE_UP(2) we need 2 bits for each state change.
2215 * As a state change to store is 0, treat all bits set as an unset item.
2216 */
2217 #define LQ_ITEM_BITS 2
2218 #define LQ_ITEM_MASK ((1 << LQ_ITEM_BITS) - 1)
2219 #define LQ_MASK(i) (LQ_ITEM_MASK << (i) * LQ_ITEM_BITS)
2220 #define LINK_STATE_UNSET LQ_ITEM_MASK
2221 #define LQ_ITEM(q, i) (((q) & LQ_MASK((i))) >> (i) * LQ_ITEM_BITS)
2222 #define LQ_STORE(q, i, v) \
2223 do { \
2224 (q) &= ~LQ_MASK((i)); \
2225 (q) |= (v) << (i) * LQ_ITEM_BITS; \
2226 } while (0 /* CONSTCOND */)
2227 #define LQ_MAX(q) ((sizeof((q)) * NBBY) / LQ_ITEM_BITS)
2228 #define LQ_POP(q, v) \
2229 do { \
2230 (v) = LQ_ITEM((q), 0); \
2231 (q) >>= LQ_ITEM_BITS; \
2232 (q) |= LINK_STATE_UNSET << (LQ_MAX((q)) - 1) * LQ_ITEM_BITS; \
2233 } while (0 /* CONSTCOND */)
2234 #define LQ_PUSH(q, v) \
2235 do { \
2236 (q) >>= LQ_ITEM_BITS; \
2237 (q) |= (v) << (LQ_MAX((q)) - 1) * LQ_ITEM_BITS; \
2238 } while (0 /* CONSTCOND */)
2239 #define LQ_FIND_UNSET(q, i) \
2240 for ((i) = 0; i < LQ_MAX((q)); (i)++) { \
2241 if (LQ_ITEM((q), (i)) == LINK_STATE_UNSET) \
2242 break; \
2243 }
2244
2245 /*
2246 * Handle a change in the interface link state and
2247 * queue notifications.
2248 */
2249 void
2250 if_link_state_change(struct ifnet *ifp, int link_state)
2251 {
2252 int idx;
2253
2254 /* Ensure change is to a valid state */
2255 switch (link_state) {
2256 case LINK_STATE_UNKNOWN: /* FALLTHROUGH */
2257 case LINK_STATE_DOWN: /* FALLTHROUGH */
2258 case LINK_STATE_UP:
2259 break;
2260 default:
2261 #ifdef DEBUG
2262 printf("%s: invalid link state %d\n",
2263 ifp->if_xname, link_state);
2264 #endif
2265 return;
2266 }
2267
2268 IF_LINK_STATE_CHANGE_LOCK(ifp);
2269
2270 /* Find the last unset event in the queue. */
2271 LQ_FIND_UNSET(ifp->if_link_queue, idx);
2272
2273 if (idx == 0) {
2274 /*
2275 * There is no queue of link state changes.
2276 * As we have the lock we can safely compare against the
2277 * current link state and return if the same.
2278 * Otherwise, if scheduled is true then the interface is being
2279 * detached and the queue is being drained so we need
2280 * to avoid queuing more work.
2281 */
2282 if (ifp->if_link_state == link_state ||
2283 ifp->if_link_scheduled)
2284 goto out;
2285 } else {
2286 /* Ensure link_state doesn't match the last queued state. */
2287 if (LQ_ITEM(ifp->if_link_queue, idx - 1)
2288 == (uint8_t)link_state)
2289 goto out;
2290 }
2291
2292 /* Handle queue overflow. */
2293 if (idx == LQ_MAX(ifp->if_link_queue)) {
2294 uint8_t lost;
2295
2296 /*
2297 * The DOWN state must be protected from being pushed off
2298 * the queue to ensure that userland will always be
2299 * in a sane state.
2300 * Because DOWN is protected, there is no need to protect
2301 * UNKNOWN.
2302 * It should be invalid to change from any other state to
2303 * UNKNOWN anyway ...
2304 */
2305 lost = LQ_ITEM(ifp->if_link_queue, 0);
2306 LQ_PUSH(ifp->if_link_queue, (uint8_t)link_state);
2307 if (lost == LINK_STATE_DOWN) {
2308 lost = LQ_ITEM(ifp->if_link_queue, 0);
2309 LQ_STORE(ifp->if_link_queue, 0, LINK_STATE_DOWN);
2310 }
2311 printf("%s: lost link state change %s\n",
2312 ifp->if_xname,
2313 lost == LINK_STATE_UP ? "UP" :
2314 lost == LINK_STATE_DOWN ? "DOWN" :
2315 "UNKNOWN");
2316 } else
2317 LQ_STORE(ifp->if_link_queue, idx, (uint8_t)link_state);
2318
2319 if (ifp->if_link_scheduled)
2320 goto out;
2321
2322 ifp->if_link_scheduled = true;
2323 workqueue_enqueue(ifnet_link_state_wq, &ifp->if_link_work, NULL);
2324
2325 out:
2326 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
2327 }
2328
2329 /*
2330 * Handle interface link state change notifications.
2331 */
2332 static void
2333 if_link_state_change_process(struct ifnet *ifp, int link_state)
2334 {
2335 struct domain *dp;
2336 const int s = splnet();
2337 bool notify;
2338
2339 KASSERT(!cpu_intr_p());
2340
2341 IF_LINK_STATE_CHANGE_LOCK(ifp);
2342
2343 /* Ensure the change is still valid. */
2344 if (ifp->if_link_state == link_state) {
2345 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
2346 splx(s);
2347 return;
2348 }
2349
2350 #ifdef DEBUG
2351 log(LOG_DEBUG, "%s: link state %s (was %s)\n", ifp->if_xname,
2352 link_state == LINK_STATE_UP ? "UP" :
2353 link_state == LINK_STATE_DOWN ? "DOWN" :
2354 "UNKNOWN",
2355 ifp->if_link_state == LINK_STATE_UP ? "UP" :
2356 ifp->if_link_state == LINK_STATE_DOWN ? "DOWN" :
2357 "UNKNOWN");
2358 #endif
2359
2360 /*
2361 * When going from UNKNOWN to UP, we need to mark existing
2362 * addresses as tentative and restart DAD as we may have
2363 * erroneously not found a duplicate.
2364 *
2365 * This needs to happen before rt_ifmsg to avoid a race where
2366 * listeners would have an address and expect it to work right
2367 * away.
2368 */
2369 notify = (link_state == LINK_STATE_UP &&
2370 ifp->if_link_state == LINK_STATE_UNKNOWN);
2371 ifp->if_link_state = link_state;
2372 /* The following routines may sleep so release the spin mutex */
2373 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
2374
2375 KERNEL_LOCK_UNLESS_NET_MPSAFE();
2376 if (notify) {
2377 DOMAIN_FOREACH(dp) {
2378 if (dp->dom_if_link_state_change != NULL)
2379 dp->dom_if_link_state_change(ifp,
2380 LINK_STATE_DOWN);
2381 }
2382 }
2383
2384 /* Notify that the link state has changed. */
2385 rt_ifmsg(ifp);
2386
2387 simplehook_dohooks(ifp->if_linkstate_hooks);
2388
2389 DOMAIN_FOREACH(dp) {
2390 if (dp->dom_if_link_state_change != NULL)
2391 dp->dom_if_link_state_change(ifp, link_state);
2392 }
2393 KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
2394 splx(s);
2395 }
2396
2397 /*
2398 * Process the interface link state change queue.
2399 */
2400 static void
2401 if_link_state_change_work(struct work *work, void *arg)
2402 {
2403 struct ifnet *ifp = container_of(work, struct ifnet, if_link_work);
2404 uint8_t state;
2405
2406 KERNEL_LOCK_UNLESS_NET_MPSAFE();
2407 const int s = splnet();
2408
2409 /*
2410 * Pop a link state change from the queue and process it.
2411 * If there is nothing to process then if_detach() has been called.
2412 * We keep if_link_scheduled = true so the queue can safely drain
2413 * without more work being queued.
2414 */
2415 IF_LINK_STATE_CHANGE_LOCK(ifp);
2416 LQ_POP(ifp->if_link_queue, state);
2417 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
2418 if (state == LINK_STATE_UNSET)
2419 goto out;
2420
2421 if_link_state_change_process(ifp, state);
2422
2423 /* If there is a link state change to come, schedule it. */
2424 IF_LINK_STATE_CHANGE_LOCK(ifp);
2425 if (LQ_ITEM(ifp->if_link_queue, 0) != LINK_STATE_UNSET) {
2426 ifp->if_link_scheduled = true;
2427 workqueue_enqueue(ifnet_link_state_wq, &ifp->if_link_work,
2428 NULL);
2429 } else
2430 ifp->if_link_scheduled = false;
2431 IF_LINK_STATE_CHANGE_UNLOCK(ifp);
2432
2433 out:
2434 splx(s);
2435 KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
2436 }
2437
2438 void *
2439 if_linkstate_change_establish(struct ifnet *ifp, void (*fn)(void *), void *arg)
2440 {
2441 khook_t *hk;
2442
2443 hk = simplehook_establish(ifp->if_linkstate_hooks, fn, arg);
2444
2445 return (void *)hk;
2446 }
2447
2448 void
2449 if_linkstate_change_disestablish(struct ifnet *ifp, void *vhook,
2450 kmutex_t *lock)
2451 {
2452
2453 simplehook_disestablish(ifp->if_linkstate_hooks, vhook, lock);
2454 }
2455
2456 /*
2457 * Used to mark addresses on an interface as DETATCHED or TENTATIVE
2458 * and thus start Duplicate Address Detection without changing the
2459 * real link state.
2460 */
2461 void
2462 if_domain_link_state_change(struct ifnet *ifp, int link_state)
2463 {
2464 struct domain *dp;
2465
2466 const int s = splnet();
2467 KERNEL_LOCK_UNLESS_NET_MPSAFE();
2468
2469 DOMAIN_FOREACH(dp) {
2470 if (dp->dom_if_link_state_change != NULL)
2471 dp->dom_if_link_state_change(ifp, link_state);
2472 }
2473
2474 splx(s);
2475 KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
2476 }
2477
2478 /*
2479 * Default action when installing a local route on a point-to-point
2480 * interface.
2481 */
2482 void
2483 p2p_rtrequest(int req, struct rtentry *rt,
2484 __unused const struct rt_addrinfo *info)
2485 {
2486 struct ifnet *ifp = rt->rt_ifp;
2487 struct ifaddr *ifa, *lo0ifa;
2488 int s = pserialize_read_enter();
2489
2490 switch (req) {
2491 case RTM_ADD:
2492 if ((rt->rt_flags & RTF_LOCAL) == 0)
2493 break;
2494
2495 rt->rt_ifp = lo0ifp;
2496
2497 if (ISSET(info->rti_flags, RTF_DONTCHANGEIFA))
2498 break;
2499
2500 IFADDR_READER_FOREACH(ifa, ifp) {
2501 if (equal(rt_getkey(rt), ifa->ifa_addr))
2502 break;
2503 }
2504 if (ifa == NULL)
2505 break;
2506
2507 /*
2508 * Ensure lo0 has an address of the same family.
2509 */
2510 IFADDR_READER_FOREACH(lo0ifa, lo0ifp) {
2511 if (lo0ifa->ifa_addr->sa_family ==
2512 ifa->ifa_addr->sa_family)
2513 break;
2514 }
2515 if (lo0ifa == NULL)
2516 break;
2517
2518 /*
2519 * Make sure to set rt->rt_ifa to the interface
2520 * address we are using, otherwise we will have trouble
2521 * with source address selection.
2522 */
2523 if (ifa != rt->rt_ifa)
2524 rt_replace_ifa(rt, ifa);
2525 break;
2526 case RTM_DELETE:
2527 default:
2528 break;
2529 }
2530 pserialize_read_exit(s);
2531 }
2532
2533 static void
2534 _if_down(struct ifnet *ifp)
2535 {
2536 struct ifaddr *ifa;
2537 struct domain *dp;
2538 struct psref psref;
2539
2540 ifp->if_flags &= ~IFF_UP;
2541 nanotime(&ifp->if_lastchange);
2542
2543 const int bound = curlwp_bind();
2544 int s = pserialize_read_enter();
2545 IFADDR_READER_FOREACH(ifa, ifp) {
2546 ifa_acquire(ifa, &psref);
2547 pserialize_read_exit(s);
2548
2549 pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
2550
2551 s = pserialize_read_enter();
2552 ifa_release(ifa, &psref);
2553 }
2554 pserialize_read_exit(s);
2555 curlwp_bindx(bound);
2556
2557 IFQ_PURGE(&ifp->if_snd);
2558 #if NCARP > 0
2559 if (ifp->if_carp)
2560 carp_carpdev_state(ifp);
2561 #endif
2562 rt_ifmsg(ifp);
2563 DOMAIN_FOREACH(dp) {
2564 if (dp->dom_if_down)
2565 dp->dom_if_down(ifp);
2566 }
2567 }
2568
2569 static void
2570 if_down_deactivated(struct ifnet *ifp)
2571 {
2572
2573 KASSERT(if_is_deactivated(ifp));
2574 _if_down(ifp);
2575 }
2576
2577 void
2578 if_down_locked(struct ifnet *ifp)
2579 {
2580
2581 KASSERT(IFNET_LOCKED(ifp));
2582 _if_down(ifp);
2583 }
2584
2585 /*
2586 * Mark an interface down and notify protocols of
2587 * the transition.
2588 * NOTE: must be called at splsoftnet or equivalent.
2589 */
2590 void
2591 if_down(struct ifnet *ifp)
2592 {
2593
2594 IFNET_LOCK(ifp);
2595 if_down_locked(ifp);
2596 IFNET_UNLOCK(ifp);
2597 }
2598
2599 /*
2600 * Must be called with holding if_ioctl_lock.
2601 */
2602 static void
2603 if_up_locked(struct ifnet *ifp)
2604 {
2605 #ifdef notyet
2606 struct ifaddr *ifa;
2607 #endif
2608 struct domain *dp;
2609
2610 KASSERT(IFNET_LOCKED(ifp));
2611
2612 KASSERT(!if_is_deactivated(ifp));
2613 ifp->if_flags |= IFF_UP;
2614 nanotime(&ifp->if_lastchange);
2615 #ifdef notyet
2616 /* this has no effect on IP, and will kill all ISO connections XXX */
2617 IFADDR_READER_FOREACH(ifa, ifp)
2618 pfctlinput(PRC_IFUP, ifa->ifa_addr);
2619 #endif
2620 #if NCARP > 0
2621 if (ifp->if_carp)
2622 carp_carpdev_state(ifp);
2623 #endif
2624 rt_ifmsg(ifp);
2625 DOMAIN_FOREACH(dp) {
2626 if (dp->dom_if_up)
2627 dp->dom_if_up(ifp);
2628 }
2629 }
2630
2631 /*
2632 * Handle interface slowtimo timer routine. Called
2633 * from softclock, we decrement timer (if set) and
2634 * call the appropriate interface routine on expiration.
2635 */
2636 static bool
2637 if_slowtimo_countdown(struct ifnet *ifp)
2638 {
2639 bool fire = false;
2640 const int s = splnet();
2641
2642 KERNEL_LOCK(1, NULL);
2643 if (ifp->if_timer != 0 && --ifp->if_timer == 0)
2644 fire = true;
2645 KERNEL_UNLOCK_ONE(NULL);
2646 splx(s);
2647
2648 return fire;
2649 }
2650
2651 static void
2652 if_slowtimo_intr(void *arg)
2653 {
2654 struct ifnet *ifp = arg;
2655 struct if_slowtimo_data *isd = ifp->if_slowtimo_data;
2656
2657 mutex_enter(&isd->isd_lock);
2658 if (!isd->isd_dying) {
2659 if (isd->isd_trigger || if_slowtimo_countdown(ifp)) {
2660 if (!isd->isd_queued) {
2661 isd->isd_queued = true;
2662 workqueue_enqueue(if_slowtimo_wq,
2663 &isd->isd_work, NULL);
2664 }
2665 } else
2666 callout_schedule(&isd->isd_ch, hz / IFNET_SLOWHZ);
2667 }
2668 mutex_exit(&isd->isd_lock);
2669 }
2670
2671 static void
2672 if_slowtimo_work(struct work *work, void *arg)
2673 {
2674 struct if_slowtimo_data *isd =
2675 container_of(work, struct if_slowtimo_data, isd_work);
2676 struct ifnet *ifp = isd->isd_ifp;
2677 const int s = splnet();
2678
2679 KERNEL_LOCK(1, NULL);
2680 (*ifp->if_slowtimo)(ifp);
2681 KERNEL_UNLOCK_ONE(NULL);
2682 splx(s);
2683
2684 mutex_enter(&isd->isd_lock);
2685 if (isd->isd_trigger) {
2686 isd->isd_trigger = false;
2687 printf("%s: watchdog triggered\n", ifp->if_xname);
2688 }
2689 isd->isd_queued = false;
2690 if (!isd->isd_dying)
2691 callout_schedule(&isd->isd_ch, hz / IFNET_SLOWHZ);
2692 mutex_exit(&isd->isd_lock);
2693 }
2694
2695 static int
2696 sysctl_if_watchdog(SYSCTLFN_ARGS)
2697 {
2698 struct sysctlnode node = *rnode;
2699 struct ifnet *ifp = node.sysctl_data;
2700 struct if_slowtimo_data *isd = ifp->if_slowtimo_data;
2701 int arg = 0;
2702 int error;
2703
2704 node.sysctl_data = &arg;
2705 error = sysctl_lookup(SYSCTLFN_CALL(&node));
2706 if (error || newp == NULL)
2707 return error;
2708 if (arg) {
2709 mutex_enter(&isd->isd_lock);
2710 KASSERT(!isd->isd_dying);
2711 isd->isd_trigger = true;
2712 callout_schedule(&isd->isd_ch, 0);
2713 mutex_exit(&isd->isd_lock);
2714 }
2715
2716 return 0;
2717 }
2718
2719 static void
2720 sysctl_watchdog_setup(struct ifnet *ifp)
2721 {
2722 struct sysctllog **clog = &ifp->if_sysctl_log;
2723 const struct sysctlnode *rnode;
2724
2725 if (sysctl_createv(clog, 0, NULL, &rnode,
2726 CTLFLAG_PERMANENT, CTLTYPE_NODE, "interfaces",
2727 SYSCTL_DESCR("Per-interface controls"),
2728 NULL, 0, NULL, 0,
2729 CTL_NET, CTL_CREATE, CTL_EOL) != 0)
2730 goto bad;
2731 if (sysctl_createv(clog, 0, &rnode, &rnode,
2732 CTLFLAG_PERMANENT, CTLTYPE_NODE, ifp->if_xname,
2733 SYSCTL_DESCR("Interface controls"),
2734 NULL, 0, NULL, 0,
2735 CTL_CREATE, CTL_EOL) != 0)
2736 goto bad;
2737 if (sysctl_createv(clog, 0, &rnode, &rnode,
2738 CTLFLAG_PERMANENT, CTLTYPE_NODE, "watchdog",
2739 SYSCTL_DESCR("Interface watchdog controls"),
2740 NULL, 0, NULL, 0,
2741 CTL_CREATE, CTL_EOL) != 0)
2742 goto bad;
2743 if (sysctl_createv(clog, 0, &rnode, NULL,
2744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "trigger",
2745 SYSCTL_DESCR("Trigger watchdog timeout"),
2746 sysctl_if_watchdog, 0, (int *)ifp, 0,
2747 CTL_CREATE, CTL_EOL) != 0)
2748 goto bad;
2749
2750 return;
2751
2752 bad:
2753 printf("%s: could not attach sysctl watchdog nodes\n", ifp->if_xname);
2754 }
2755
2756 /*
2757 * Mark an interface up and notify protocols of
2758 * the transition.
2759 * NOTE: must be called at splsoftnet or equivalent.
2760 */
2761 void
2762 if_up(struct ifnet *ifp)
2763 {
2764
2765 IFNET_LOCK(ifp);
2766 if_up_locked(ifp);
2767 IFNET_UNLOCK(ifp);
2768 }
2769
2770 /*
2771 * Set/clear promiscuous mode on interface ifp based on the truth value
2772 * of pswitch. The calls are reference counted so that only the first
2773 * "on" request actually has an effect, as does the final "off" request.
2774 * Results are undefined if the "off" and "on" requests are not matched.
2775 */
2776 int
2777 ifpromisc_locked(struct ifnet *ifp, int pswitch)
2778 {
2779 int pcount, ret = 0;
2780 u_short nflags;
2781
2782 KASSERT(IFNET_LOCKED(ifp));
2783
2784 pcount = ifp->if_pcount;
2785 if (pswitch) {
2786 /*
2787 * Allow the device to be "placed" into promiscuous
2788 * mode even if it is not configured up. It will
2789 * consult IFF_PROMISC when it is brought up.
2790 */
2791 if (ifp->if_pcount++ != 0)
2792 goto out;
2793 nflags = ifp->if_flags | IFF_PROMISC;
2794 } else {
2795 if (--ifp->if_pcount > 0)
2796 goto out;
2797 nflags = ifp->if_flags & ~IFF_PROMISC;
2798 }
2799 ret = if_flags_set(ifp, nflags);
2800 /* Restore interface state if not successful. */
2801 if (ret != 0)
2802 ifp->if_pcount = pcount;
2803
2804 out:
2805 return ret;
2806 }
2807
2808 int
2809 ifpromisc(struct ifnet *ifp, int pswitch)
2810 {
2811 int e;
2812
2813 IFNET_LOCK(ifp);
2814 e = ifpromisc_locked(ifp, pswitch);
2815 IFNET_UNLOCK(ifp);
2816
2817 return e;
2818 }
2819
2820 /*
2821 * if_ioctl(ifp, cmd, data)
2822 *
2823 * Apply an ioctl command to the interface. Returns 0 on success,
2824 * nonzero errno(3) number on failure.
2825 *
2826 * For SIOCADDMULTI/SIOCDELMULTI, caller need not hold locks -- it
2827 * is the driver's responsibility to take any internal locks.
2828 * (Kernel logic should generally invoke these only through
2829 * if_mcast_op.)
2830 *
2831 * For all other ioctls, caller must hold ifp->if_ioctl_lock,
2832 * a.k.a. IFNET_LOCK. May sleep.
2833 */
2834 int
2835 if_ioctl(struct ifnet *ifp, u_long cmd, void *data)
2836 {
2837
2838 switch (cmd) {
2839 case SIOCADDMULTI:
2840 case SIOCDELMULTI:
2841 break;
2842 default:
2843 KASSERTMSG(IFNET_LOCKED(ifp), "%s", ifp->if_xname);
2844 }
2845
2846 return (*ifp->if_ioctl)(ifp, cmd, data);
2847 }
2848
2849 /*
2850 * if_init(ifp)
2851 *
2852 * Prepare the hardware underlying ifp to process packets
2853 * according to its current configuration. Returns 0 on success,
2854 * nonzero errno(3) number on failure.
2855 *
2856 * May sleep. Caller must hold ifp->if_ioctl_lock, a.k.a
2857 * IFNET_LOCK.
2858 */
2859 int
2860 if_init(struct ifnet *ifp)
2861 {
2862
2863 KASSERTMSG(IFNET_LOCKED(ifp), "%s", ifp->if_xname);
2864
2865 return (*ifp->if_init)(ifp);
2866 }
2867
2868 /*
2869 * if_stop(ifp, disable)
2870 *
2871 * Stop the hardware underlying ifp from processing packets.
2872 *
2873 * If disable is true, ... XXX(?)
2874 *
2875 * May sleep. Caller must hold ifp->if_ioctl_lock, a.k.a
2876 * IFNET_LOCK.
2877 */
2878 void
2879 if_stop(struct ifnet *ifp, int disable)
2880 {
2881
2882 KASSERTMSG(IFNET_LOCKED(ifp), "%s", ifp->if_xname);
2883
2884 (*ifp->if_stop)(ifp, disable);
2885 }
2886
2887 /*
2888 * Map interface name to
2889 * interface structure pointer.
2890 */
2891 struct ifnet *
2892 ifunit(const char *name)
2893 {
2894 struct ifnet *ifp;
2895 const char *cp = name;
2896 u_int unit = 0;
2897 u_int i;
2898
2899 /*
2900 * If the entire name is a number, treat it as an ifindex.
2901 */
2902 for (i = 0; i < IFNAMSIZ && *cp >= '' && *cp <= '9'; i++, cp++)
2903 unit = unit * 10 + (*cp - '');
2904
2905 /*
2906 * If the number took all of the name, then it's a valid ifindex.
2907 */
2908 if (i == IFNAMSIZ || (cp != name && *cp == '\0'))
2909 return if_byindex(unit);
2910
2911 ifp = NULL;
2912 const int s = pserialize_read_enter();
2913 IFNET_READER_FOREACH(ifp) {
2914 if (if_is_deactivated(ifp))
2915 continue;
2916 if (strcmp(ifp->if_xname, name) == 0)
2917 goto out;
2918 }
2919 out:
2920 pserialize_read_exit(s);
2921 return ifp;
2922 }
2923
2924 /*
2925 * Get a reference of an ifnet object by an interface name.
2926 * The returned reference is protected by psref(9). The caller
2927 * must release a returned reference by if_put after use.
2928 */
2929 struct ifnet *
2930 if_get(const char *name, struct psref *psref)
2931 {
2932 struct ifnet *ifp;
2933 const char *cp = name;
2934 u_int unit = 0;
2935 u_int i;
2936
2937 /*
2938 * If the entire name is a number, treat it as an ifindex.
2939 */
2940 for (i = 0; i < IFNAMSIZ && *cp >= '' && *cp <= '9'; i++, cp++)
2941 unit = unit * 10 + (*cp - '');
2942
2943 /*
2944 * If the number took all of the name, then it's a valid ifindex.
2945 */
2946 if (i == IFNAMSIZ || (cp != name && *cp == '\0'))
2947 return if_get_byindex(unit, psref);
2948
2949 ifp = NULL;
2950 const int s = pserialize_read_enter();
2951 IFNET_READER_FOREACH(ifp) {
2952 if (if_is_deactivated(ifp))
2953 continue;
2954 if (strcmp(ifp->if_xname, name) == 0) {
2955 PSREF_DEBUG_FILL_RETURN_ADDRESS(psref);
2956 psref_acquire(psref, &ifp->if_psref,
2957 ifnet_psref_class);
2958 goto out;
2959 }
2960 }
2961 out:
2962 pserialize_read_exit(s);
2963 return ifp;
2964 }
2965
2966 /*
2967 * Release a reference of an ifnet object given by if_get, if_get_byindex
2968 * or if_get_bylla.
2969 */
2970 void
2971 if_put(const struct ifnet *ifp, struct psref *psref)
2972 {
2973
2974 if (ifp == NULL)
2975 return;
2976
2977 psref_release(psref, &ifp->if_psref, ifnet_psref_class);
2978 }
2979
2980 /*
2981 * Return ifp having idx. Return NULL if not found. Normally if_byindex
2982 * should be used.
2983 */
2984 ifnet_t *
2985 _if_byindex(u_int idx)
2986 {
2987
2988 return (__predict_true(idx < if_indexlim)) ? ifindex2ifnet[idx] : NULL;
2989 }
2990
2991 /*
2992 * Return ifp having idx. Return NULL if not found or the found ifp is
2993 * already deactivated.
2994 */
2995 ifnet_t *
2996 if_byindex(u_int idx)
2997 {
2998 ifnet_t *ifp;
2999
3000 ifp = _if_byindex(idx);
3001 if (ifp != NULL && if_is_deactivated(ifp))
3002 ifp = NULL;
3003 return ifp;
3004 }
3005
3006 /*
3007 * Get a reference of an ifnet object by an interface index.
3008 * The returned reference is protected by psref(9). The caller
3009 * must release a returned reference by if_put after use.
3010 */
3011 ifnet_t *
3012 if_get_byindex(u_int idx, struct psref *psref)
3013 {
3014 ifnet_t *ifp;
3015
3016 const int s = pserialize_read_enter();
3017 ifp = if_byindex(idx);
3018 if (__predict_true(ifp != NULL)) {
3019 PSREF_DEBUG_FILL_RETURN_ADDRESS(psref);
3020 psref_acquire(psref, &ifp->if_psref, ifnet_psref_class);
3021 }
3022 pserialize_read_exit(s);
3023
3024 return ifp;
3025 }
3026
3027 ifnet_t *
3028 if_get_bylla(const void *lla, unsigned char lla_len, struct psref *psref)
3029 {
3030 ifnet_t *ifp;
3031
3032 const int s = pserialize_read_enter();
3033 IFNET_READER_FOREACH(ifp) {
3034 if (if_is_deactivated(ifp))
3035 continue;
3036 if (ifp->if_addrlen != lla_len)
3037 continue;
3038 if (memcmp(lla, CLLADDR(ifp->if_sadl), lla_len) == 0) {
3039 psref_acquire(psref, &ifp->if_psref,
3040 ifnet_psref_class);
3041 break;
3042 }
3043 }
3044 pserialize_read_exit(s);
3045
3046 return ifp;
3047 }
3048
3049 /*
3050 * Note that it's safe only if the passed ifp is guaranteed to not be freed,
3051 * for example using pserialize or the ifp is already held or some other
3052 * object is held which guarantes the ifp to not be freed indirectly.
3053 */
3054 void
3055 if_acquire(struct ifnet *ifp, struct psref *psref)
3056 {
3057
3058 KASSERT(ifp->if_index != 0);
3059 psref_acquire(psref, &ifp->if_psref, ifnet_psref_class);
3060 }
3061
3062 bool
3063 if_held(struct ifnet *ifp)
3064 {
3065
3066 return psref_held(&ifp->if_psref, ifnet_psref_class);
3067 }
3068
3069 /*
3070 * Some tunnel interfaces can nest, e.g. IPv4 over IPv4 gif(4) tunnel over
3071 * IPv4. Check the tunnel nesting count.
3072 * Return > 0, if tunnel nesting count is more than limit.
3073 * Return 0, if tunnel nesting count is equal or less than limit.
3074 */
3075 int
3076 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, int limit)
3077 {
3078 struct m_tag *mtag;
3079 int *count;
3080
3081 mtag = m_tag_find(m, PACKET_TAG_TUNNEL_INFO);
3082 if (mtag != NULL) {
3083 count = (int *)(mtag + 1);
3084 if (++(*count) > limit) {
3085 log(LOG_NOTICE,
3086 "%s: recursively called too many times(%d)\n",
3087 ifp->if_xname, *count);
3088 return EIO;
3089 }
3090 } else {
3091 mtag = m_tag_get(PACKET_TAG_TUNNEL_INFO, sizeof(*count),
3092 M_NOWAIT);
3093 if (mtag != NULL) {
3094 m_tag_prepend(m, mtag);
3095 count = (int *)(mtag + 1);
3096 *count = 0;
3097 } else {
3098 log(LOG_DEBUG, "%s: m_tag_get() failed, "
3099 "recursion calls are not prevented.\n",
3100 ifp->if_xname);
3101 }
3102 }
3103
3104 return 0;
3105 }
3106
3107 static void
3108 if_tunnel_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
3109 {
3110 struct tunnel_ro *tro = p;
3111
3112 tro->tr_ro = kmem_zalloc(sizeof(*tro->tr_ro), KM_SLEEP);
3113 tro->tr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);
3114 }
3115
3116 static void
3117 if_tunnel_ro_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused)
3118 {
3119 struct tunnel_ro *tro = p;
3120
3121 rtcache_free(tro->tr_ro);
3122 kmem_free(tro->tr_ro, sizeof(*tro->tr_ro));
3123
3124 mutex_obj_free(tro->tr_lock);
3125 }
3126
3127 percpu_t *
3128 if_tunnel_alloc_ro_percpu(void)
3129 {
3130
3131 return percpu_create(sizeof(struct tunnel_ro),
3132 if_tunnel_ro_init_pc, if_tunnel_ro_fini_pc, NULL);
3133 }
3134
3135 void
3136 if_tunnel_free_ro_percpu(percpu_t *ro_percpu)
3137 {
3138
3139 percpu_free(ro_percpu, sizeof(struct tunnel_ro));
3140 }
3141
3142
3143 static void
3144 if_tunnel_rtcache_free_pc(void *p, void *arg __unused,
3145 struct cpu_info *ci __unused)
3146 {
3147 struct tunnel_ro *tro = p;
3148
3149 mutex_enter(tro->tr_lock);
3150 rtcache_free(tro->tr_ro);
3151 mutex_exit(tro->tr_lock);
3152 }
3153
3154 void if_tunnel_ro_percpu_rtcache_free(percpu_t *ro_percpu)
3155 {
3156
3157 percpu_foreach(ro_percpu, if_tunnel_rtcache_free_pc, NULL);
3158 }
3159
3160 void
3161 if_export_if_data(ifnet_t * const ifp, struct if_data *ifi, bool zero_stats)
3162 {
3163
3164 /* Collect the volatile stats first; this zeros *ifi. */
3165 if_stats_to_if_data(ifp, ifi, zero_stats);
3166
3167 ifi->ifi_type = ifp->if_type;
3168 ifi->ifi_addrlen = ifp->if_addrlen;
3169 ifi->ifi_hdrlen = ifp->if_hdrlen;
3170 ifi->ifi_link_state = ifp->if_link_state;
3171 ifi->ifi_mtu = ifp->if_mtu;
3172 ifi->ifi_metric = ifp->if_metric;
3173 ifi->ifi_baudrate = ifp->if_baudrate;
3174 ifi->ifi_lastchange = ifp->if_lastchange;
3175 }
3176
3177 /* common */
3178 int
3179 ifioctl_common(struct ifnet *ifp, u_long cmd, void *data)
3180 {
3181 struct ifreq *ifr;
3182 struct ifcapreq *ifcr;
3183 struct ifdatareq *ifdr;
3184 unsigned short flags;
3185 char *descr;
3186 int error;
3187
3188 switch (cmd) {
3189 case SIOCSIFCAP:
3190 ifcr = data;
3191 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0)
3192 return EINVAL;
3193
3194 if (ifcr->ifcr_capenable == ifp->if_capenable)
3195 return 0;
3196
3197 ifp->if_capenable = ifcr->ifcr_capenable;
3198
3199 /* Pre-compute the checksum flags mask. */
3200 ifp->if_csum_flags_tx = 0;
3201 ifp->if_csum_flags_rx = 0;
3202 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx)
3203 ifp->if_csum_flags_tx |= M_CSUM_IPv4;
3204 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx)
3205 ifp->if_csum_flags_rx |= M_CSUM_IPv4;
3206
3207 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx)
3208 ifp->if_csum_flags_tx |= M_CSUM_TCPv4;
3209 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx)
3210 ifp->if_csum_flags_rx |= M_CSUM_TCPv4;
3211
3212 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx)
3213 ifp->if_csum_flags_tx |= M_CSUM_UDPv4;
3214 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx)
3215 ifp->if_csum_flags_rx |= M_CSUM_UDPv4;
3216
3217 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx)
3218 ifp->if_csum_flags_tx |= M_CSUM_TCPv6;
3219 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx)
3220 ifp->if_csum_flags_rx |= M_CSUM_TCPv6;
3221
3222 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx)
3223 ifp->if_csum_flags_tx |= M_CSUM_UDPv6;
3224 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx)
3225 ifp->if_csum_flags_rx |= M_CSUM_UDPv6;
3226
3227 if (ifp->if_capenable & IFCAP_TSOv4)
3228 ifp->if_csum_flags_tx |= M_CSUM_TSOv4;
3229 if (ifp->if_capenable & IFCAP_TSOv6)
3230 ifp->if_csum_flags_tx |= M_CSUM_TSOv6;
3231
3232 #if NBRIDGE > 0
3233 if (ifp->if_bridge != NULL)
3234 bridge_calc_csum_flags(ifp->if_bridge);
3235 #endif
3236
3237 if (ifp->if_flags & IFF_UP)
3238 return ENETRESET;
3239 return 0;
3240 case SIOCSIFFLAGS:
3241 ifr = data;
3242 /*
3243 * If if_is_mpsafe(ifp), KERNEL_LOCK isn't held here, but if_up
3244 * and if_down aren't MP-safe yet, so we must hold the lock.
3245 */
3246 KERNEL_LOCK_IF_IFP_MPSAFE(ifp);
3247 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
3248 const int s = splsoftnet();
3249 if_down_locked(ifp);
3250 splx(s);
3251 }
3252 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {
3253 const int s = splsoftnet();
3254 if_up_locked(ifp);
3255 splx(s);
3256 }
3257 KERNEL_UNLOCK_IF_IFP_MPSAFE(ifp);
3258 flags = (ifp->if_flags & IFF_CANTCHANGE) |
3259 (ifr->ifr_flags &~ IFF_CANTCHANGE);
3260 if (ifp->if_flags != flags) {
3261 ifp->if_flags = flags;
3262 /* Notify that the flags have changed. */
3263 rt_ifmsg(ifp);
3264 }
3265 break;
3266 case SIOCGIFFLAGS:
3267 ifr = data;
3268 ifr->ifr_flags = ifp->if_flags;
3269 break;
3270
3271 case SIOCGIFMETRIC:
3272 ifr = data;
3273 ifr->ifr_metric = ifp->if_metric;
3274 break;
3275
3276 case SIOCGIFMTU:
3277 ifr = data;
3278 ifr->ifr_mtu = ifp->if_mtu;
3279 break;
3280
3281 case SIOCGIFDLT:
3282 ifr = data;
3283 ifr->ifr_dlt = ifp->if_dlt;
3284 break;
3285
3286 case SIOCGIFCAP:
3287 ifcr = data;
3288 ifcr->ifcr_capabilities = ifp->if_capabilities;
3289 ifcr->ifcr_capenable = ifp->if_capenable;
3290 break;
3291
3292 case SIOCSIFMETRIC:
3293 ifr = data;
3294 ifp->if_metric = ifr->ifr_metric;
3295 break;
3296
3297 case SIOCGIFDATA:
3298 ifdr = data;
3299 if_export_if_data(ifp, &ifdr->ifdr_data, false);
3300 break;
3301
3302 case SIOCGIFINDEX:
3303 ifr = data;
3304 ifr->ifr_index = ifp->if_index;
3305 break;
3306
3307 case SIOCZIFDATA:
3308 ifdr = data;
3309 if_export_if_data(ifp, &ifdr->ifdr_data, true);
3310 getnanotime(&ifp->if_lastchange);
3311 break;
3312 case SIOCSIFMTU:
3313 ifr = data;
3314 if (ifp->if_mtu == ifr->ifr_mtu)
3315 break;
3316 ifp->if_mtu = ifr->ifr_mtu;
3317 return ENETRESET;
3318 case SIOCSIFDESCR:
3319 error = kauth_authorize_network(kauth_cred_get(),
3320 KAUTH_NETWORK_INTERFACE,
3321 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, KAUTH_ARG(cmd),
3322 NULL);
3323 if (error)
3324 return error;
3325
3326 ifr = data;
3327
3328 if (ifr->ifr_buflen > IFDESCRSIZE)
3329 return ENAMETOOLONG;
3330
3331 if (ifr->ifr_buf == NULL || ifr->ifr_buflen == 0) {
3332 /* unset description */
3333 descr = NULL;
3334 } else {
3335 descr = kmem_zalloc(IFDESCRSIZE, KM_SLEEP);
3336 /*
3337 * copy (IFDESCRSIZE - 1) bytes to ensure
3338 * terminating nul
3339 */
3340 error = copyin(ifr->ifr_buf, descr, IFDESCRSIZE - 1);
3341 if (error) {
3342 kmem_free(descr, IFDESCRSIZE);
3343 return error;
3344 }
3345 }
3346
3347 if (ifp->if_description != NULL)
3348 kmem_free(ifp->if_description, IFDESCRSIZE);
3349
3350 ifp->if_description = descr;
3351 break;
3352
3353 case SIOCGIFDESCR:
3354 ifr = data;
3355 descr = ifp->if_description;
3356
3357 if (descr == NULL)
3358 return ENOMSG;
3359
3360 if (ifr->ifr_buflen < IFDESCRSIZE)
3361 return EINVAL;
3362
3363 error = copyout(descr, ifr->ifr_buf, IFDESCRSIZE);
3364 if (error)
3365 return error;
3366 break;
3367
3368 default:
3369 return ENOTTY;
3370 }
3371 return 0;
3372 }
3373
3374 int
3375 ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
3376 {
3377 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data;
3378 struct ifaddr *ifa;
3379 const struct sockaddr *any, *sa;
3380 union {
3381 struct sockaddr sa;
3382 struct sockaddr_storage ss;
3383 } u, v;
3384 int s, error = 0;
3385
3386 switch (cmd) {
3387 case SIOCSIFADDRPREF:
3388 error = kauth_authorize_network(kauth_cred_get(),
3389 KAUTH_NETWORK_INTERFACE,
3390 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, KAUTH_ARG(cmd),
3391 NULL);
3392 if (error)
3393 return error;
3394 break;
3395 case SIOCGIFADDRPREF:
3396 break;
3397 default:
3398 return EOPNOTSUPP;
3399 }
3400
3401 /* sanity checks */
3402 if (data == NULL || ifp == NULL) {
3403 panic("invalid argument to %s", __func__);
3404 /*NOTREACHED*/
3405 }
3406
3407 /* address must be specified on ADD and DELETE */
3408 sa = sstocsa(&ifap->ifap_addr);
3409 if (sa->sa_family != sofamily(so))
3410 return EINVAL;
3411 if ((any = sockaddr_any(sa)) == NULL || sa->sa_len != any->sa_len)
3412 return EINVAL;
3413
3414 sockaddr_externalize(&v.sa, sizeof(v.ss), sa);
3415
3416 s = pserialize_read_enter();
3417 IFADDR_READER_FOREACH(ifa, ifp) {
3418 if (ifa->ifa_addr->sa_family != sa->sa_family)
3419 continue;
3420 sockaddr_externalize(&u.sa, sizeof(u.ss), ifa->ifa_addr);
3421 if (sockaddr_cmp(&u.sa, &v.sa) == 0)
3422 break;
3423 }
3424 if (ifa == NULL) {
3425 error = EADDRNOTAVAIL;
3426 goto out;
3427 }
3428
3429 switch (cmd) {
3430 case SIOCSIFADDRPREF:
3431 ifa->ifa_preference = ifap->ifap_preference;
3432 goto out;
3433 case SIOCGIFADDRPREF:
3434 /* fill in the if_laddrreq structure */
3435 (void)sockaddr_copy(sstosa(&ifap->ifap_addr),
3436 sizeof(ifap->ifap_addr), ifa->ifa_addr);
3437 ifap->ifap_preference = ifa->ifa_preference;
3438 goto out;
3439 default:
3440 error = EOPNOTSUPP;
3441 }
3442 out:
3443 pserialize_read_exit(s);
3444 return error;
3445 }
3446
3447 /*
3448 * Interface ioctls.
3449 */
3450 static int
3451 doifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l)
3452 {
3453 struct ifnet *ifp;
3454 struct ifreq *ifr;
3455 int error = 0;
3456 u_long ocmd = cmd;
3457 u_short oif_flags;
3458 struct ifreq ifrb;
3459 struct oifreq *oifr = NULL;
3460 int r;
3461 struct psref psref;
3462 bool do_if43_post = false;
3463 bool do_ifm80_post = false;
3464
3465 switch (cmd) {
3466 case SIOCGIFCONF:
3467 return ifconf(cmd, data);
3468 case SIOCINITIFADDR:
3469 return EPERM;
3470 default:
3471 MODULE_HOOK_CALL(uipc_syscalls_40_hook, (cmd, data), enosys(),
3472 error);
3473 if (error != ENOSYS)
3474 return error;
3475 MODULE_HOOK_CALL(uipc_syscalls_50_hook, (l, cmd, data),
3476 enosys(), error);
3477 if (error != ENOSYS)
3478 return error;
3479 error = 0;
3480 break;
3481 }
3482
3483 ifr = data;
3484 /* Pre-conversion */
3485 MODULE_HOOK_CALL(if_cvtcmd_43_hook, (&cmd, ocmd), enosys(), error);
3486 if (cmd != ocmd) {
3487 oifr = data;
3488 data = ifr = &ifrb;
3489 IFREQO2N_43(oifr, ifr);
3490 do_if43_post = true;
3491 }
3492 MODULE_HOOK_CALL(ifmedia_80_pre_hook, (ifr, &cmd, &do_ifm80_post),
3493 enosys(), error);
3494
3495 switch (cmd) {
3496 case SIOCIFCREATE:
3497 case SIOCIFDESTROY: {
3498 const int bound = curlwp_bind();
3499 if (l != NULL) {
3500 ifp = if_get(ifr->ifr_name, &psref);
3501 error = kauth_authorize_network(l->l_cred,
3502 KAUTH_NETWORK_INTERFACE,
3503 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp,
3504 KAUTH_ARG(cmd), NULL);
3505 if (ifp != NULL)
3506 if_put(ifp, &psref);
3507 if (error != 0) {
3508 curlwp_bindx(bound);
3509 return error;
3510 }
3511 }
3512 KERNEL_LOCK_UNLESS_NET_MPSAFE();
3513 mutex_enter(&if_clone_mtx);
3514 r = (cmd == SIOCIFCREATE) ?
3515 if_clone_create(ifr->ifr_name) :
3516 if_clone_destroy(ifr->ifr_name);
3517 mutex_exit(&if_clone_mtx);
3518 KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
3519 curlwp_bindx(bound);
3520 return r;
3521 }
3522 case SIOCIFGCLONERS: {
3523 struct if_clonereq *req = (struct if_clonereq *)data;
3524 return if_clone_list(req->ifcr_count, req->ifcr_buffer,
3525 &req->ifcr_total);
3526 }
3527 }
3528
3529 if ((cmd & IOC_IN) == 0 || IOCPARM_LEN(cmd) < sizeof(ifr->ifr_name))
3530 return EINVAL;
3531
3532 const int bound = curlwp_bind();
3533 ifp = if_get(ifr->ifr_name, &psref);
3534 if (ifp == NULL) {
3535 curlwp_bindx(bound);
3536 return ENXIO;
3537 }
3538
3539 switch (cmd) {
3540 case SIOCALIFADDR:
3541 case SIOCDLIFADDR:
3542 case SIOCSIFADDRPREF:
3543 case SIOCSIFFLAGS:
3544 case SIOCSIFCAP:
3545 case SIOCSIFMETRIC:
3546 case SIOCZIFDATA:
3547 case SIOCSIFMTU:
3548 case SIOCSIFPHYADDR:
3549 case SIOCDIFPHYADDR:
3550 #ifdef INET6
3551 case SIOCSIFPHYADDR_IN6:
3552 #endif
3553 case SIOCSLIFPHYADDR:
3554 case SIOCADDMULTI:
3555 case SIOCDELMULTI:
3556 case SIOCSETHERCAP:
3557 case SIOCSIFMEDIA:
3558 case SIOCSDRVSPEC:
3559 case SIOCG80211:
3560 case SIOCS80211:
3561 case SIOCS80211NWID:
3562 case SIOCS80211NWKEY:
3563 case SIOCS80211POWER:
3564 case SIOCS80211BSSID:
3565 case SIOCS80211CHANNEL:
3566 case SIOCSLINKSTR:
3567 if (l != NULL) {
3568 error = kauth_authorize_network(l->l_cred,
3569 KAUTH_NETWORK_INTERFACE,
3570 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp,
3571 KAUTH_ARG(cmd), NULL);
3572 if (error != 0)
3573 goto out;
3574 }
3575 }
3576
3577 oif_flags = ifp->if_flags;
3578
3579 KERNEL_LOCK_UNLESS_IFP_MPSAFE(ifp);
3580 IFNET_LOCK(ifp);
3581
3582 error = if_ioctl(ifp, cmd, data);
3583 if (error != ENOTTY)
3584 ;
3585 else if (so->so_proto == NULL)
3586 error = EOPNOTSUPP;
3587 else {
3588 KERNEL_LOCK_IF_IFP_MPSAFE(ifp);
3589 MODULE_HOOK_CALL(if_ifioctl_43_hook,
3590 (so, ocmd, cmd, data, l), enosys(), error);
3591 if (error == ENOSYS)
3592 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so,
3593 cmd, data, ifp);
3594 KERNEL_UNLOCK_IF_IFP_MPSAFE(ifp);
3595 }
3596
3597 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) {
3598 if ((ifp->if_flags & IFF_UP) != 0) {
3599 const int s = splsoftnet();
3600 if_up_locked(ifp);
3601 splx(s);
3602 }
3603 }
3604
3605 /* Post-conversion */
3606 if (do_ifm80_post && (error == 0))
3607 MODULE_HOOK_CALL(ifmedia_80_post_hook, (ifr, cmd),
3608 enosys(), error);
3609 if (do_if43_post)
3610 IFREQN2O_43(oifr, ifr);
3611
3612 IFNET_UNLOCK(ifp);
3613 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(ifp);
3614 out:
3615 if_put(ifp, &psref);
3616 curlwp_bindx(bound);
3617 return error;
3618 }
3619
3620 /*
3621 * Return interface configuration
3622 * of system. List may be used
3623 * in later ioctl's (above) to get
3624 * other information.
3625 *
3626 * Each record is a struct ifreq. Before the addition of
3627 * sockaddr_storage, the API rule was that sockaddr flavors that did
3628 * not fit would extend beyond the struct ifreq, with the next struct
3629 * ifreq starting sa_len beyond the struct sockaddr. Because the
3630 * union in struct ifreq includes struct sockaddr_storage, every kind
3631 * of sockaddr must fit. Thus, there are no longer any overlength
3632 * records.
3633 *
3634 * Records are added to the user buffer if they fit, and ifc_len is
3635 * adjusted to the length that was written. Thus, the user is only
3636 * assured of getting the complete list if ifc_len on return is at
3637 * least sizeof(struct ifreq) less than it was on entry.
3638 *
3639 * If the user buffer pointer is NULL, this routine copies no data and
3640 * returns the amount of space that would be needed.
3641 *
3642 * Invariants:
3643 * ifrp points to the next part of the user's buffer to be used. If
3644 * ifrp != NULL, space holds the number of bytes remaining that we may
3645 * write at ifrp. Otherwise, space holds the number of bytes that
3646 * would have been written had there been adequate space.
3647 */
3648 /*ARGSUSED*/
3649 static int
3650 ifconf(u_long cmd, void *data)
3651 {
3652 struct ifconf *ifc = (struct ifconf *)data;
3653 struct ifnet *ifp;
3654 struct ifaddr *ifa;
3655 struct ifreq ifr, *ifrp = NULL;
3656 int space = 0, error = 0;
3657 const int sz = (int)sizeof(struct ifreq);
3658 const bool docopy = ifc->ifc_req != NULL;
3659 struct psref psref;
3660
3661 if (docopy) {
3662 if (ifc->ifc_len < 0)
3663 return EINVAL;
3664
3665 space = ifc->ifc_len;
3666 ifrp = ifc->ifc_req;
3667 }
3668 memset(&ifr, 0, sizeof(ifr));
3669
3670 const int bound = curlwp_bind();
3671 int s = pserialize_read_enter();
3672 IFNET_READER_FOREACH(ifp) {
3673 psref_acquire(&psref, &ifp->if_psref, ifnet_psref_class);
3674 pserialize_read_exit(s);
3675
3676 (void)strncpy(ifr.ifr_name, ifp->if_xname,
3677 sizeof(ifr.ifr_name));
3678 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') {
3679 error = ENAMETOOLONG;
3680 goto release_exit;
3681 }
3682 if (IFADDR_READER_EMPTY(ifp)) {
3683 /* Interface with no addresses - send zero sockaddr. */
3684 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
3685 if (!docopy) {
3686 space += sz;
3687 goto next;
3688 }
3689 if (space >= sz) {
3690 error = copyout(&ifr, ifrp, sz);
3691 if (error != 0)
3692 goto release_exit;
3693 ifrp++;
3694 space -= sz;
3695 }
3696 }
3697
3698 s = pserialize_read_enter();
3699 IFADDR_READER_FOREACH(ifa, ifp) {
3700 struct sockaddr *sa = ifa->ifa_addr;
3701 /* all sockaddrs must fit in sockaddr_storage */
3702 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru));
3703
3704 if (!docopy) {
3705 space += sz;
3706 continue;
3707 }
3708 memcpy(&ifr.ifr_space, sa, sa->sa_len);
3709 pserialize_read_exit(s);
3710
3711 if (space >= sz) {
3712 error = copyout(&ifr, ifrp, sz);
3713 if (error != 0)
3714 goto release_exit;
3715 ifrp++; space -= sz;
3716 }
3717 s = pserialize_read_enter();
3718 }
3719 pserialize_read_exit(s);
3720
3721 next:
3722 s = pserialize_read_enter();
3723 psref_release(&psref, &ifp->if_psref, ifnet_psref_class);
3724 }
3725 pserialize_read_exit(s);
3726 curlwp_bindx(bound);
3727
3728 if (docopy) {
3729 KASSERT(0 <= space && space <= ifc->ifc_len);
3730 ifc->ifc_len -= space;
3731 } else {
3732 KASSERT(space >= 0);
3733 ifc->ifc_len = space;
3734 }
3735 return 0;
3736
3737 release_exit:
3738 psref_release(&psref, &ifp->if_psref, ifnet_psref_class);
3739 curlwp_bindx(bound);
3740 return error;
3741 }
3742
3743 int
3744 ifreq_setaddr(u_long cmd, struct ifreq *ifr, const struct sockaddr *sa)
3745 {
3746 uint8_t len = sizeof(ifr->ifr_ifru.ifru_space);
3747 struct ifreq ifrb;
3748 struct oifreq *oifr = NULL;
3749 u_long ocmd = cmd;
3750 int hook;
3751
3752 MODULE_HOOK_CALL(if_cvtcmd_43_hook, (&cmd, ocmd), enosys(), hook);
3753 if (hook != ENOSYS) {
3754 if (cmd != ocmd) {
3755 oifr = (struct oifreq *)(void *)ifr;
3756 ifr = &ifrb;
3757 IFREQO2N_43(oifr, ifr);
3758 len = sizeof(oifr->ifr_addr);
3759 }
3760 }
3761
3762 if (len < sa->sa_len)
3763 return EFBIG;
3764
3765 memset(&ifr->ifr_addr, 0, len);
3766 sockaddr_copy(&ifr->ifr_addr, len, sa);
3767
3768 if (cmd != ocmd)
3769 IFREQN2O_43(oifr, ifr);
3770 return 0;
3771 }
3772
3773 /*
3774 * wrapper function for the drivers which doesn't have if_transmit().
3775 */
3776 static int
3777 if_transmit(struct ifnet *ifp, struct mbuf *m)
3778 {
3779 int error;
3780 size_t pktlen = m->m_pkthdr.len;
3781 bool mcast = (m->m_flags & M_MCAST) != 0;
3782
3783 const int s = splnet();
3784
3785 IFQ_ENQUEUE(&ifp->if_snd, m, error);
3786 if (error != 0) {
3787 /* mbuf is already freed */
3788 goto out;
3789 }
3790
3791 net_stat_ref_t nsr = IF_STAT_GETREF(ifp);
3792 if_statadd_ref(nsr, if_obytes, pktlen);
3793 if (mcast)
3794 if_statinc_ref(nsr, if_omcasts);
3795 IF_STAT_PUTREF(ifp);
3796
3797 if ((ifp->if_flags & IFF_OACTIVE) == 0)
3798 if_start_lock(ifp);
3799 out:
3800 splx(s);
3801
3802 return error;
3803 }
3804
3805 int
3806 if_transmit_lock(struct ifnet *ifp, struct mbuf *m)
3807 {
3808 int error;
3809
3810 kmsan_check_mbuf(m);
3811
3812 #ifdef ALTQ
3813 KERNEL_LOCK(1, NULL);
3814 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
3815 error = if_transmit(ifp, m);
3816 KERNEL_UNLOCK_ONE(NULL);
3817 } else {
3818 KERNEL_UNLOCK_ONE(NULL);
3819 error = (*ifp->if_transmit)(ifp, m);
3820 /* mbuf is already freed */
3821 }
3822 #else /* !ALTQ */
3823 error = (*ifp->if_transmit)(ifp, m);
3824 /* mbuf is already freed */
3825 #endif /* !ALTQ */
3826
3827 return error;
3828 }
3829
3830 /*
3831 * Queue message on interface, and start output if interface
3832 * not yet active.
3833 */
3834 int
3835 ifq_enqueue(struct ifnet *ifp, struct mbuf *m)
3836 {
3837
3838 return if_transmit_lock(ifp, m);
3839 }
3840
3841 /*
3842 * Queue message on interface, possibly using a second fast queue
3843 */
3844 int
3845 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m)
3846 {
3847 int error = 0;
3848
3849 if (ifq != NULL
3850 #ifdef ALTQ
3851 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0
3852 #endif
3853 ) {
3854 if (IF_QFULL(ifq)) {
3855 IF_DROP(&ifp->if_snd);
3856 m_freem(m);
3857 if (error == 0)
3858 error = ENOBUFS;
3859 } else
3860 IF_ENQUEUE(ifq, m);
3861 } else
3862 IFQ_ENQUEUE(&ifp->if_snd, m, error);
3863 if (error != 0) {
3864 if_statinc(ifp, if_oerrors);
3865 return error;
3866 }
3867 return 0;
3868 }
3869
3870 int
3871 if_addr_init(ifnet_t *ifp, struct ifaddr *ifa, const bool src)
3872 {
3873 int rc;
3874
3875 KASSERT(IFNET_LOCKED(ifp));
3876 if (ifp->if_initaddr != NULL)
3877 rc = (*ifp->if_initaddr)(ifp, ifa, src);
3878 else if (src || (rc = if_ioctl(ifp, SIOCSIFDSTADDR, ifa)) == ENOTTY)
3879 rc = if_ioctl(ifp, SIOCINITIFADDR, ifa);
3880
3881 return rc;
3882 }
3883
3884 int
3885 if_do_dad(struct ifnet *ifp)
3886 {
3887 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
3888 return 0;
3889
3890 switch (ifp->if_type) {
3891 case IFT_FAITH:
3892 /*
3893 * These interfaces do not have the IFF_LOOPBACK flag,
3894 * but loop packets back. We do not have to do DAD on such
3895 * interfaces. We should even omit it, because loop-backed
3896 * responses would confuse the DAD procedure.
3897 */
3898 return 0;
3899 default:
3900 /*
3901 * Our DAD routine requires the interface up and running.
3902 * However, some interfaces can be up before the RUNNING
3903 * status. Additionally, users may try to assign addresses
3904 * before the interface becomes up (or running).
3905 * We simply skip DAD in such a case as a work around.
3906 * XXX: we should rather mark "tentative" on such addresses,
3907 * and do DAD after the interface becomes ready.
3908 */
3909 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) !=
3910 (IFF_UP | IFF_RUNNING))
3911 return 0;
3912
3913 return 1;
3914 }
3915 }
3916
3917 /*
3918 * if_flags_set(ifp, flags)
3919 *
3920 * Ask ifp to change ifp->if_flags to flags, as if with the
3921 * SIOCSIFFLAGS ioctl command.
3922 *
3923 * May sleep. Caller must hold ifp->if_ioctl_lock, a.k.a
3924 * IFNET_LOCK.
3925 */
3926 int
3927 if_flags_set(ifnet_t *ifp, const u_short flags)
3928 {
3929 int rc;
3930
3931 KASSERT(IFNET_LOCKED(ifp));
3932
3933 if (ifp->if_setflags != NULL)
3934 rc = (*ifp->if_setflags)(ifp, flags);
3935 else {
3936 u_short cantflags, chgdflags;
3937 struct ifreq ifr;
3938
3939 chgdflags = ifp->if_flags ^ flags;
3940 cantflags = chgdflags & IFF_CANTCHANGE;
3941
3942 if (cantflags != 0)
3943 ifp->if_flags ^= cantflags;
3944
3945 /*
3946 * Traditionally, we do not call if_ioctl after
3947 * setting/clearing only IFF_PROMISC if the interface
3948 * isn't IFF_UP. Uphold that tradition.
3949 */
3950 if (chgdflags == IFF_PROMISC && (ifp->if_flags & IFF_UP) == 0)
3951 return 0;
3952
3953 memset(&ifr, 0, sizeof(ifr));
3954
3955 ifr.ifr_flags = flags & ~IFF_CANTCHANGE;
3956 rc = if_ioctl(ifp, SIOCSIFFLAGS, &ifr);
3957
3958 if (rc != 0 && cantflags != 0)
3959 ifp->if_flags ^= cantflags;
3960 }
3961
3962 return rc;
3963 }
3964
3965 /*
3966 * if_mcast_op(ifp, cmd, sa)
3967 *
3968 * Apply a multicast command, SIOCADDMULTI/SIOCDELMULTI, to the
3969 * interface. Returns 0 on success, nonzero errno(3) number on
3970 * failure.
3971 *
3972 * May sleep.
3973 *
3974 * Use this, not if_ioctl, for the multicast commands.
3975 */
3976 int
3977 if_mcast_op(ifnet_t *ifp, const unsigned long cmd, const struct sockaddr *sa)
3978 {
3979 int rc;
3980 struct ifreq ifr;
3981
3982 switch (cmd) {
3983 case SIOCADDMULTI:
3984 case SIOCDELMULTI:
3985 break;
3986 default:
3987 panic("invalid ifnet multicast command: 0x%lx", cmd);
3988 }
3989
3990 ifreq_setaddr(cmd, &ifr, sa);
3991 rc = if_ioctl(ifp, cmd, &ifr);
3992
3993 return rc;
3994 }
3995
3996 static void
3997 sysctl_sndq_setup(struct sysctllog **clog, const char *ifname,
3998 struct ifaltq *ifq)
3999 {
4000 const struct sysctlnode *cnode, *rnode;
4001
4002 if (sysctl_createv(clog, 0, NULL, &rnode,
4003 CTLFLAG_PERMANENT,
4004 CTLTYPE_NODE, "interfaces",
4005 SYSCTL_DESCR("Per-interface controls"),
4006 NULL, 0, NULL, 0,
4007 CTL_NET, CTL_CREATE, CTL_EOL) != 0)
4008 goto bad;
4009
4010 if (sysctl_createv(clog, 0, &rnode, &rnode,
4011 CTLFLAG_PERMANENT,
4012 CTLTYPE_NODE, ifname,
4013 SYSCTL_DESCR("Interface controls"),
4014 NULL, 0, NULL, 0,
4015 CTL_CREATE, CTL_EOL) != 0)
4016 goto bad;
4017
4018 if (sysctl_createv(clog, 0, &rnode, &rnode,
4019 CTLFLAG_PERMANENT,
4020 CTLTYPE_NODE, "sndq",
4021 SYSCTL_DESCR("Interface output queue controls"),
4022 NULL, 0, NULL, 0,
4023 CTL_CREATE, CTL_EOL) != 0)
4024 goto bad;
4025
4026 if (sysctl_createv(clog, 0, &rnode, &cnode,
4027 CTLFLAG_PERMANENT,
4028 CTLTYPE_INT, "len",
4029 SYSCTL_DESCR("Current output queue length"),
4030 NULL, 0, &ifq->ifq_len, 0,
4031 CTL_CREATE, CTL_EOL) != 0)
4032 goto bad;
4033
4034 if (sysctl_createv(clog, 0, &rnode, &cnode,
4035 CTLFLAG_PERMANENT | CTLFLAG_READWRITE,
4036 CTLTYPE_INT, "maxlen",
4037 SYSCTL_DESCR("Maximum allowed output queue length"),
4038 NULL, 0, &ifq->ifq_maxlen, 0,
4039 CTL_CREATE, CTL_EOL) != 0)
4040 goto bad;
4041
4042 if (sysctl_createv(clog, 0, &rnode, &cnode,
4043 CTLFLAG_PERMANENT,
4044 CTLTYPE_QUAD, "drops",
4045 SYSCTL_DESCR("Packets dropped due to full output queue"),
4046 NULL, 0, &ifq->ifq_drops, 0,
4047 CTL_CREATE, CTL_EOL) != 0)
4048 goto bad;
4049
4050 return;
4051 bad:
4052 printf("%s: could not attach sysctl nodes\n", ifname);
4053 return;
4054 }
4055
4056 static int
4057 if_sdl_sysctl(SYSCTLFN_ARGS)
4058 {
4059 struct ifnet *ifp;
4060 const struct sockaddr_dl *sdl;
4061 struct psref psref;
4062 int error = 0;
4063
4064 if (namelen != 1)
4065 return EINVAL;
4066
4067 const int bound = curlwp_bind();
4068 ifp = if_get_byindex(name[0], &psref);
4069 if (ifp == NULL) {
4070 error = ENODEV;
4071 goto out0;
4072 }
4073
4074 sdl = ifp->if_sadl;
4075 if (sdl == NULL) {
4076 *oldlenp = 0;
4077 goto out1;
4078 }
4079
4080 if (oldp == NULL) {
4081 *oldlenp = sdl->sdl_alen;
4082 goto out1;
4083 }
4084
4085 if (*oldlenp >= sdl->sdl_alen)
4086 *oldlenp = sdl->sdl_alen;
4087 error = sysctl_copyout(l, &sdl->sdl_data[sdl->sdl_nlen],
4088 oldp, *oldlenp);
4089 out1:
4090 if_put(ifp, &psref);
4091 out0:
4092 curlwp_bindx(bound);
4093 return error;
4094 }
4095
4096 static void
4097 if_sysctl_setup(struct sysctllog **clog)
4098 {
4099 const struct sysctlnode *rnode = NULL;
4100
4101 sysctl_createv(clog, 0, NULL, &rnode,
4102 CTLFLAG_PERMANENT,
4103 CTLTYPE_NODE, "sdl",
4104 SYSCTL_DESCR("Get active link-layer address"),
4105 if_sdl_sysctl, 0, NULL, 0,
4106 CTL_NET, CTL_CREATE, CTL_EOL);
4107 }
Cache object: d21a98f6ce63964d2b7fa579159ee704
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