xref: /freebsd/sys/net/if.c (revision f1951fd745b894fe6586c298874af98544a5e272)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1980, 1986, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	@(#)if.c	8.5 (Berkeley) 1/9/95
32  * $FreeBSD$
33  */
34 
35 #include "opt_inet6.h"
36 #include "opt_inet.h"
37 
38 #include <sys/param.h>
39 #include <sys/types.h>
40 #include <sys/conf.h>
41 #include <sys/malloc.h>
42 #include <sys/sbuf.h>
43 #include <sys/bus.h>
44 #include <sys/epoch.h>
45 #include <sys/mbuf.h>
46 #include <sys/systm.h>
47 #include <sys/priv.h>
48 #include <sys/proc.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/protosw.h>
52 #include <sys/kernel.h>
53 #include <sys/lock.h>
54 #include <sys/refcount.h>
55 #include <sys/module.h>
56 #include <sys/rwlock.h>
57 #include <sys/sockio.h>
58 #include <sys/syslog.h>
59 #include <sys/sysctl.h>
60 #include <sys/sysent.h>
61 #include <sys/taskqueue.h>
62 #include <sys/domain.h>
63 #include <sys/jail.h>
64 #include <sys/priv.h>
65 
66 #include <machine/stdarg.h>
67 #include <vm/uma.h>
68 
69 #include <net/bpf.h>
70 #include <net/ethernet.h>
71 #include <net/if.h>
72 #include <net/if_arp.h>
73 #include <net/if_clone.h>
74 #include <net/if_dl.h>
75 #include <net/if_types.h>
76 #include <net/if_var.h>
77 #include <net/if_media.h>
78 #include <net/if_vlan_var.h>
79 #include <net/radix.h>
80 #include <net/route.h>
81 #include <net/vnet.h>
82 
83 #if defined(INET) || defined(INET6)
84 #include <net/ethernet.h>
85 #include <netinet/in.h>
86 #include <netinet/in_var.h>
87 #include <netinet/ip.h>
88 #include <netinet/ip_carp.h>
89 #ifdef INET
90 #include <netinet/if_ether.h>
91 #include <netinet/netdump/netdump.h>
92 #endif /* INET */
93 #ifdef INET6
94 #include <netinet6/in6_var.h>
95 #include <netinet6/in6_ifattach.h>
96 #endif /* INET6 */
97 #endif /* INET || INET6 */
98 
99 #include <security/mac/mac_framework.h>
100 
101 /*
102  * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name
103  * and ifr_ifru when it is used in SIOCGIFCONF.
104  */
105 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) ==
106     offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru");
107 
108 __read_mostly epoch_t net_epoch_preempt;
109 __read_mostly epoch_t net_epoch;
110 #ifdef COMPAT_FREEBSD32
111 #include <sys/mount.h>
112 #include <compat/freebsd32/freebsd32.h>
113 
114 struct ifreq_buffer32 {
115 	uint32_t	length;		/* (size_t) */
116 	uint32_t	buffer;		/* (void *) */
117 };
118 
119 /*
120  * Interface request structure used for socket
121  * ioctl's.  All interface ioctl's must have parameter
122  * definitions which begin with ifr_name.  The
123  * remainder may be interface specific.
124  */
125 struct ifreq32 {
126 	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
127 	union {
128 		struct sockaddr	ifru_addr;
129 		struct sockaddr	ifru_dstaddr;
130 		struct sockaddr	ifru_broadaddr;
131 		struct ifreq_buffer32 ifru_buffer;
132 		short		ifru_flags[2];
133 		short		ifru_index;
134 		int		ifru_jid;
135 		int		ifru_metric;
136 		int		ifru_mtu;
137 		int		ifru_phys;
138 		int		ifru_media;
139 		uint32_t	ifru_data;
140 		int		ifru_cap[2];
141 		u_int		ifru_fib;
142 		u_char		ifru_vlan_pcp;
143 	} ifr_ifru;
144 };
145 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32));
146 CTASSERT(__offsetof(struct ifreq, ifr_ifru) ==
147     __offsetof(struct ifreq32, ifr_ifru));
148 
149 struct ifgroupreq32 {
150 	char	ifgr_name[IFNAMSIZ];
151 	u_int	ifgr_len;
152 	union {
153 		char		ifgru_group[IFNAMSIZ];
154 		uint32_t	ifgru_groups;
155 	} ifgr_ifgru;
156 };
157 
158 struct ifmediareq32 {
159 	char		ifm_name[IFNAMSIZ];
160 	int		ifm_current;
161 	int		ifm_mask;
162 	int		ifm_status;
163 	int		ifm_active;
164 	int		ifm_count;
165 	uint32_t	ifm_ulist;	/* (int *) */
166 };
167 #define	SIOCGIFMEDIA32	_IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32)
168 #define	SIOCGIFXMEDIA32	_IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32)
169 
170 #define	_CASE_IOC_IFGROUPREQ_32(cmd)				\
171     case _IOC_NEWTYPE((cmd), struct ifgroupreq32):
172 #else /* !COMPAT_FREEBSD32 */
173 #define _CASE_IOC_IFGROUPREQ_32(cmd)
174 #endif /* !COMPAT_FREEBSD32 */
175 
176 #define CASE_IOC_IFGROUPREQ(cmd)	\
177     _CASE_IOC_IFGROUPREQ_32(cmd)	\
178     case (cmd)
179 
180 union ifreq_union {
181 	struct ifreq	ifr;
182 #ifdef COMPAT_FREEBSD32
183 	struct ifreq32	ifr32;
184 #endif
185 };
186 
187 union ifgroupreq_union {
188 	struct ifgroupreq ifgr;
189 #ifdef COMPAT_FREEBSD32
190 	struct ifgroupreq32 ifgr32;
191 #endif
192 };
193 
194 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
195 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
196 
197 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
198     &ifqmaxlen, 0, "max send queue size");
199 
200 /* Log link state change events */
201 static int log_link_state_change = 1;
202 
203 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
204 	&log_link_state_change, 0,
205 	"log interface link state change events");
206 
207 /* Log promiscuous mode change events */
208 static int log_promisc_mode_change = 1;
209 
210 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN,
211 	&log_promisc_mode_change, 1,
212 	"log promiscuous mode change events");
213 
214 /* Interface description */
215 static unsigned int ifdescr_maxlen = 1024;
216 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW,
217 	&ifdescr_maxlen, 0,
218 	"administrative maximum length for interface description");
219 
220 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions");
221 
222 /* global sx for non-critical path ifdescr */
223 static struct sx ifdescr_sx;
224 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
225 
226 void	(*ng_ether_link_state_p)(struct ifnet *ifp, int state);
227 void	(*lagg_linkstate_p)(struct ifnet *ifp, int state);
228 /* These are external hooks for CARP. */
229 void	(*carp_linkstate_p)(struct ifnet *ifp);
230 void	(*carp_demote_adj_p)(int, char *);
231 int	(*carp_master_p)(struct ifaddr *);
232 #if defined(INET) || defined(INET6)
233 int	(*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
234 int	(*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
235     const struct sockaddr *sa);
236 int	(*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
237 int	(*carp_attach_p)(struct ifaddr *, int);
238 void	(*carp_detach_p)(struct ifaddr *, bool);
239 #endif
240 #ifdef INET
241 int	(*carp_iamatch_p)(struct ifaddr *, uint8_t **);
242 #endif
243 #ifdef INET6
244 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
245 caddr_t	(*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
246     const struct in6_addr *taddr);
247 #endif
248 
249 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
250 
251 /*
252  * XXX: Style; these should be sorted alphabetically, and unprototyped
253  * static functions should be prototyped. Currently they are sorted by
254  * declaration order.
255  */
256 static void	if_attachdomain(void *);
257 static void	if_attachdomain1(struct ifnet *);
258 static int	ifconf(u_long, caddr_t);
259 static void	*if_grow(void);
260 static void	if_input_default(struct ifnet *, struct mbuf *);
261 static int	if_requestencap_default(struct ifnet *, struct if_encap_req *);
262 static void	if_route(struct ifnet *, int flag, int fam);
263 static int	if_setflag(struct ifnet *, int, int, int *, int);
264 static int	if_transmit(struct ifnet *ifp, struct mbuf *m);
265 static void	if_unroute(struct ifnet *, int flag, int fam);
266 static void	link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
267 static int	ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *);
268 static int	if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
269 static void	do_link_state_change(void *, int);
270 static int	if_getgroup(struct ifgroupreq *, struct ifnet *);
271 static int	if_getgroupmembers(struct ifgroupreq *);
272 static void	if_delgroups(struct ifnet *);
273 static void	if_attach_internal(struct ifnet *, int, struct if_clone *);
274 static int	if_detach_internal(struct ifnet *, int, struct if_clone **);
275 #ifdef VIMAGE
276 static void	if_vmove(struct ifnet *, struct vnet *);
277 #endif
278 
279 #ifdef INET6
280 /*
281  * XXX: declare here to avoid to include many inet6 related files..
282  * should be more generalized?
283  */
284 extern void	nd6_setmtu(struct ifnet *);
285 #endif
286 
287 /* ipsec helper hooks */
288 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]);
289 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]);
290 
291 VNET_DEFINE(int, if_index);
292 int	ifqmaxlen = IFQ_MAXLEN;
293 VNET_DEFINE(struct ifnethead, ifnet);	/* depend on static init XXX */
294 VNET_DEFINE(struct ifgrouphead, ifg_head);
295 
296 VNET_DEFINE_STATIC(int, if_indexlim) = 8;
297 
298 /* Table of ifnet by index. */
299 VNET_DEFINE(struct ifnet **, ifindex_table);
300 
301 #define	V_if_indexlim		VNET(if_indexlim)
302 #define	V_ifindex_table		VNET(ifindex_table)
303 
304 /*
305  * The global network interface list (V_ifnet) and related state (such as
306  * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and
307  * an rwlock.  Either may be acquired shared to stablize the list, but both
308  * must be acquired writable to modify the list.  This model allows us to
309  * both stablize the interface list during interrupt thread processing, but
310  * also to stablize it over long-running ioctls, without introducing priority
311  * inversions and deadlocks.
312  */
313 struct rwlock ifnet_rwlock;
314 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE);
315 struct sx ifnet_sxlock;
316 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE);
317 
318 /*
319  * The allocation of network interfaces is a rather non-atomic affair; we
320  * need to select an index before we are ready to expose the interface for
321  * use, so will use this pointer value to indicate reservation.
322  */
323 #define	IFNET_HOLD	(void *)(uintptr_t)(-1)
324 
325 static	if_com_alloc_t *if_com_alloc[256];
326 static	if_com_free_t *if_com_free[256];
327 
328 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
329 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
330 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
331 
332 struct ifnet *
333 ifnet_byindex_locked(u_short idx)
334 {
335 
336 	if (idx > V_if_index)
337 		return (NULL);
338 	if (V_ifindex_table[idx] == IFNET_HOLD)
339 		return (NULL);
340 	return (V_ifindex_table[idx]);
341 }
342 
343 struct ifnet *
344 ifnet_byindex(u_short idx)
345 {
346 	struct ifnet *ifp;
347 
348 	ifp = ifnet_byindex_locked(idx);
349 	return (ifp);
350 }
351 
352 struct ifnet *
353 ifnet_byindex_ref(u_short idx)
354 {
355 	struct ifnet *ifp;
356 
357 	IFNET_RLOCK_NOSLEEP();
358 	ifp = ifnet_byindex_locked(idx);
359 	if (ifp == NULL || (ifp->if_flags & IFF_DYING)) {
360 		IFNET_RUNLOCK_NOSLEEP();
361 		return (NULL);
362 	}
363 	if_ref(ifp);
364 	IFNET_RUNLOCK_NOSLEEP();
365 	return (ifp);
366 }
367 
368 /*
369  * Allocate an ifindex array entry; return 0 on success or an error on
370  * failure.
371  */
372 static u_short
373 ifindex_alloc(void **old)
374 {
375 	u_short idx;
376 
377 	IFNET_WLOCK_ASSERT();
378 	/*
379 	 * Try to find an empty slot below V_if_index.  If we fail, take the
380 	 * next slot.
381 	 */
382 	for (idx = 1; idx <= V_if_index; idx++) {
383 		if (V_ifindex_table[idx] == NULL)
384 			break;
385 	}
386 
387 	/* Catch if_index overflow. */
388 	if (idx >= V_if_indexlim) {
389 		*old = if_grow();
390 		return (USHRT_MAX);
391 	}
392 	if (idx > V_if_index)
393 		V_if_index = idx;
394 	return (idx);
395 }
396 
397 static void
398 ifindex_free_locked(u_short idx)
399 {
400 
401 	IFNET_WLOCK_ASSERT();
402 
403 	V_ifindex_table[idx] = NULL;
404 	while (V_if_index > 0 &&
405 	    V_ifindex_table[V_if_index] == NULL)
406 		V_if_index--;
407 }
408 
409 static void
410 ifindex_free(u_short idx)
411 {
412 
413 	IFNET_WLOCK();
414 	ifindex_free_locked(idx);
415 	IFNET_WUNLOCK();
416 }
417 
418 static void
419 ifnet_setbyindex(u_short idx, struct ifnet *ifp)
420 {
421 
422 	V_ifindex_table[idx] = ifp;
423 }
424 
425 struct ifaddr *
426 ifaddr_byindex(u_short idx)
427 {
428 	struct ifnet *ifp;
429 	struct ifaddr *ifa = NULL;
430 
431 	IFNET_RLOCK_NOSLEEP();
432 	ifp = ifnet_byindex_locked(idx);
433 	if (ifp != NULL && (ifa = ifp->if_addr) != NULL)
434 		ifa_ref(ifa);
435 	IFNET_RUNLOCK_NOSLEEP();
436 	return (ifa);
437 }
438 
439 /*
440  * Network interface utility routines.
441  *
442  * Routines with ifa_ifwith* names take sockaddr *'s as
443  * parameters.
444  */
445 
446 static void
447 vnet_if_init(const void *unused __unused)
448 {
449 	void *old;
450 
451 	CK_STAILQ_INIT(&V_ifnet);
452 	CK_STAILQ_INIT(&V_ifg_head);
453 	IFNET_WLOCK();
454 	old = if_grow();				/* create initial table */
455 	IFNET_WUNLOCK();
456 	epoch_wait_preempt(net_epoch_preempt);
457 	free(old, M_IFNET);
458 	vnet_if_clone_init();
459 }
460 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
461     NULL);
462 
463 #ifdef VIMAGE
464 static void
465 vnet_if_uninit(const void *unused __unused)
466 {
467 
468 	VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
469 	    "not empty", __func__, __LINE__, &V_ifnet));
470 	VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
471 	    "not empty", __func__, __LINE__, &V_ifg_head));
472 
473 	free((caddr_t)V_ifindex_table, M_IFNET);
474 }
475 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
476     vnet_if_uninit, NULL);
477 
478 static void
479 vnet_if_return(const void *unused __unused)
480 {
481 	struct ifnet *ifp, *nifp;
482 
483 	/* Return all inherited interfaces to their parent vnets. */
484 	CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
485 		if (ifp->if_home_vnet != ifp->if_vnet)
486 			if_vmove(ifp, ifp->if_home_vnet);
487 	}
488 }
489 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY,
490     vnet_if_return, NULL);
491 #endif
492 
493 
494 static void *
495 if_grow(void)
496 {
497 	int oldlim;
498 	u_int n;
499 	struct ifnet **e;
500 	void *old;
501 
502 	old = NULL;
503 	IFNET_WLOCK_ASSERT();
504 	oldlim = V_if_indexlim;
505 	IFNET_WUNLOCK();
506 	n = (oldlim << 1) * sizeof(*e);
507 	e = malloc(n, M_IFNET, M_WAITOK | M_ZERO);
508 	IFNET_WLOCK();
509 	if (V_if_indexlim != oldlim) {
510 		free(e, M_IFNET);
511 		return (NULL);
512 	}
513 	if (V_ifindex_table != NULL) {
514 		memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2);
515 		old = V_ifindex_table;
516 	}
517 	V_if_indexlim <<= 1;
518 	V_ifindex_table = e;
519 	return (old);
520 }
521 
522 /*
523  * Allocate a struct ifnet and an index for an interface.  A layer 2
524  * common structure will also be allocated if an allocation routine is
525  * registered for the passed type.
526  */
527 struct ifnet *
528 if_alloc(u_char type)
529 {
530 	struct ifnet *ifp;
531 	u_short idx;
532 	void *old;
533 
534 	ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO);
535  restart:
536 	IFNET_WLOCK();
537 	idx = ifindex_alloc(&old);
538 	if (__predict_false(idx == USHRT_MAX)) {
539 		IFNET_WUNLOCK();
540 		epoch_wait_preempt(net_epoch_preempt);
541 		free(old, M_IFNET);
542 		goto restart;
543 	}
544 	ifnet_setbyindex(idx, IFNET_HOLD);
545 	IFNET_WUNLOCK();
546 	ifp->if_index = idx;
547 	ifp->if_type = type;
548 	ifp->if_alloctype = type;
549 #ifdef VIMAGE
550 	ifp->if_vnet = curvnet;
551 #endif
552 	if (if_com_alloc[type] != NULL) {
553 		ifp->if_l2com = if_com_alloc[type](type, ifp);
554 		if (ifp->if_l2com == NULL) {
555 			free(ifp, M_IFNET);
556 			ifindex_free(idx);
557 			return (NULL);
558 		}
559 	}
560 
561 	IF_ADDR_LOCK_INIT(ifp);
562 	TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
563 	ifp->if_afdata_initialized = 0;
564 	IF_AFDATA_LOCK_INIT(ifp);
565 	CK_STAILQ_INIT(&ifp->if_addrhead);
566 	CK_STAILQ_INIT(&ifp->if_multiaddrs);
567 	CK_STAILQ_INIT(&ifp->if_groups);
568 #ifdef MAC
569 	mac_ifnet_init(ifp);
570 #endif
571 	ifq_init(&ifp->if_snd, ifp);
572 
573 	refcount_init(&ifp->if_refcount, 1);	/* Index reference. */
574 	for (int i = 0; i < IFCOUNTERS; i++)
575 		ifp->if_counters[i] = counter_u64_alloc(M_WAITOK);
576 	ifp->if_get_counter = if_get_counter_default;
577 	ifp->if_pcp = IFNET_PCP_NONE;
578 	ifnet_setbyindex(ifp->if_index, ifp);
579 	return (ifp);
580 }
581 
582 /*
583  * Do the actual work of freeing a struct ifnet, and layer 2 common
584  * structure.  This call is made when the last reference to an
585  * interface is released.
586  */
587 static void
588 if_free_internal(struct ifnet *ifp)
589 {
590 
591 	KASSERT((ifp->if_flags & IFF_DYING),
592 	    ("if_free_internal: interface not dying"));
593 
594 	if (if_com_free[ifp->if_alloctype] != NULL)
595 		if_com_free[ifp->if_alloctype](ifp->if_l2com,
596 		    ifp->if_alloctype);
597 
598 #ifdef MAC
599 	mac_ifnet_destroy(ifp);
600 #endif /* MAC */
601 	if (ifp->if_description != NULL)
602 		free(ifp->if_description, M_IFDESCR);
603 	IF_AFDATA_DESTROY(ifp);
604 	IF_ADDR_LOCK_DESTROY(ifp);
605 	ifq_delete(&ifp->if_snd);
606 
607 	for (int i = 0; i < IFCOUNTERS; i++)
608 		counter_u64_free(ifp->if_counters[i]);
609 
610 	free(ifp, M_IFNET);
611 }
612 
613 static void
614 if_destroy(epoch_context_t ctx)
615 {
616 	struct ifnet *ifp;
617 
618 	ifp = __containerof(ctx, struct ifnet, if_epoch_ctx);
619 	if_free_internal(ifp);
620 }
621 
622 /*
623  * Deregister an interface and free the associated storage.
624  */
625 void
626 if_free(struct ifnet *ifp)
627 {
628 
629 	ifp->if_flags |= IFF_DYING;			/* XXX: Locking */
630 
631 	CURVNET_SET_QUIET(ifp->if_vnet);
632 	IFNET_WLOCK();
633 	KASSERT(ifp == ifnet_byindex_locked(ifp->if_index),
634 	    ("%s: freeing unallocated ifnet", ifp->if_xname));
635 
636 	ifindex_free_locked(ifp->if_index);
637 	IFNET_WUNLOCK();
638 
639 	if (refcount_release(&ifp->if_refcount))
640 		epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy);
641 	CURVNET_RESTORE();
642 }
643 
644 /*
645  * Interfaces to keep an ifnet type-stable despite the possibility of the
646  * driver calling if_free().  If there are additional references, we defer
647  * freeing the underlying data structure.
648  */
649 void
650 if_ref(struct ifnet *ifp)
651 {
652 
653 	/* We don't assert the ifnet list lock here, but arguably should. */
654 	refcount_acquire(&ifp->if_refcount);
655 }
656 
657 void
658 if_rele(struct ifnet *ifp)
659 {
660 
661 	if (!refcount_release(&ifp->if_refcount))
662 		return;
663 	epoch_call(net_epoch_preempt, &ifp->if_epoch_ctx, if_destroy);
664 }
665 
666 void
667 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
668 {
669 
670 	mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
671 
672 	if (ifq->ifq_maxlen == 0)
673 		ifq->ifq_maxlen = ifqmaxlen;
674 
675 	ifq->altq_type = 0;
676 	ifq->altq_disc = NULL;
677 	ifq->altq_flags &= ALTQF_CANTCHANGE;
678 	ifq->altq_tbr  = NULL;
679 	ifq->altq_ifp  = ifp;
680 }
681 
682 void
683 ifq_delete(struct ifaltq *ifq)
684 {
685 	mtx_destroy(&ifq->ifq_mtx);
686 }
687 
688 /*
689  * Perform generic interface initialization tasks and attach the interface
690  * to the list of "active" interfaces.  If vmove flag is set on entry
691  * to if_attach_internal(), perform only a limited subset of initialization
692  * tasks, given that we are moving from one vnet to another an ifnet which
693  * has already been fully initialized.
694  *
695  * Note that if_detach_internal() removes group membership unconditionally
696  * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL.
697  * Thus, when if_vmove() is applied to a cloned interface, group membership
698  * is lost while a cloned one always joins a group whose name is
699  * ifc->ifc_name.  To recover this after if_detach_internal() and
700  * if_attach_internal(), the cloner should be specified to
701  * if_attach_internal() via ifc.  If it is non-NULL, if_attach_internal()
702  * attempts to join a group whose name is ifc->ifc_name.
703  *
704  * XXX:
705  *  - The decision to return void and thus require this function to
706  *    succeed is questionable.
707  *  - We should probably do more sanity checking.  For instance we don't
708  *    do anything to insure if_xname is unique or non-empty.
709  */
710 void
711 if_attach(struct ifnet *ifp)
712 {
713 
714 	if_attach_internal(ifp, 0, NULL);
715 }
716 
717 /*
718  * Compute the least common TSO limit.
719  */
720 void
721 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax)
722 {
723 	/*
724 	 * 1) If there is no limit currently, take the limit from
725 	 * the network adapter.
726 	 *
727 	 * 2) If the network adapter has a limit below the current
728 	 * limit, apply it.
729 	 */
730 	if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
731 	    ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
732 		pmax->tsomaxbytes = ifp->if_hw_tsomax;
733 	}
734 	if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
735 	    ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
736 		pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
737 	}
738 	if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
739 	    ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
740 		pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
741 	}
742 }
743 
744 /*
745  * Update TSO limit of a network adapter.
746  *
747  * Returns zero if no change. Else non-zero.
748  */
749 int
750 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax)
751 {
752 	int retval = 0;
753 	if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
754 		ifp->if_hw_tsomax = pmax->tsomaxbytes;
755 		retval++;
756 	}
757 	if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
758 		ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
759 		retval++;
760 	}
761 	if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
762 		ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
763 		retval++;
764 	}
765 	return (retval);
766 }
767 
768 static void
769 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc)
770 {
771 	unsigned socksize, ifasize;
772 	int namelen, masklen;
773 	struct sockaddr_dl *sdl;
774 	struct ifaddr *ifa;
775 
776 	if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index))
777 		panic ("%s: BUG: if_attach called without if_alloc'd input()\n",
778 		    ifp->if_xname);
779 
780 #ifdef VIMAGE
781 	ifp->if_vnet = curvnet;
782 	if (ifp->if_home_vnet == NULL)
783 		ifp->if_home_vnet = curvnet;
784 #endif
785 
786 	if_addgroup(ifp, IFG_ALL);
787 
788 	/* Restore group membership for cloned interfaces. */
789 	if (vmove && ifc != NULL)
790 		if_clone_addgroup(ifp, ifc);
791 
792 	getmicrotime(&ifp->if_lastchange);
793 	ifp->if_epoch = time_uptime;
794 
795 	KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
796 	    (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
797 	    ("transmit and qflush must both either be set or both be NULL"));
798 	if (ifp->if_transmit == NULL) {
799 		ifp->if_transmit = if_transmit;
800 		ifp->if_qflush = if_qflush;
801 	}
802 	if (ifp->if_input == NULL)
803 		ifp->if_input = if_input_default;
804 
805 	if (ifp->if_requestencap == NULL)
806 		ifp->if_requestencap = if_requestencap_default;
807 
808 	if (!vmove) {
809 #ifdef MAC
810 		mac_ifnet_create(ifp);
811 #endif
812 
813 		/*
814 		 * Create a Link Level name for this device.
815 		 */
816 		namelen = strlen(ifp->if_xname);
817 		/*
818 		 * Always save enough space for any possiable name so we
819 		 * can do a rename in place later.
820 		 */
821 		masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
822 		socksize = masklen + ifp->if_addrlen;
823 		if (socksize < sizeof(*sdl))
824 			socksize = sizeof(*sdl);
825 		socksize = roundup2(socksize, sizeof(long));
826 		ifasize = sizeof(*ifa) + 2 * socksize;
827 		ifa = ifa_alloc(ifasize, M_WAITOK);
828 		sdl = (struct sockaddr_dl *)(ifa + 1);
829 		sdl->sdl_len = socksize;
830 		sdl->sdl_family = AF_LINK;
831 		bcopy(ifp->if_xname, sdl->sdl_data, namelen);
832 		sdl->sdl_nlen = namelen;
833 		sdl->sdl_index = ifp->if_index;
834 		sdl->sdl_type = ifp->if_type;
835 		ifp->if_addr = ifa;
836 		ifa->ifa_ifp = ifp;
837 		ifa->ifa_rtrequest = link_rtrequest;
838 		ifa->ifa_addr = (struct sockaddr *)sdl;
839 		sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
840 		ifa->ifa_netmask = (struct sockaddr *)sdl;
841 		sdl->sdl_len = masklen;
842 		while (namelen != 0)
843 			sdl->sdl_data[--namelen] = 0xff;
844 		CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
845 		/* Reliably crash if used uninitialized. */
846 		ifp->if_broadcastaddr = NULL;
847 
848 		if (ifp->if_type == IFT_ETHER) {
849 			ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR,
850 			    M_WAITOK | M_ZERO);
851 		}
852 
853 #if defined(INET) || defined(INET6)
854 		/* Use defaults for TSO, if nothing is set */
855 		if (ifp->if_hw_tsomax == 0 &&
856 		    ifp->if_hw_tsomaxsegcount == 0 &&
857 		    ifp->if_hw_tsomaxsegsize == 0) {
858 			/*
859 			 * The TSO defaults needs to be such that an
860 			 * NFS mbuf list of 35 mbufs totalling just
861 			 * below 64K works and that a chain of mbufs
862 			 * can be defragged into at most 32 segments:
863 			 */
864 			ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
865 			    (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
866 			ifp->if_hw_tsomaxsegcount = 35;
867 			ifp->if_hw_tsomaxsegsize = 2048;	/* 2K */
868 
869 			/* XXX some drivers set IFCAP_TSO after ethernet attach */
870 			if (ifp->if_capabilities & IFCAP_TSO) {
871 				if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
872 				    ifp->if_hw_tsomax,
873 				    ifp->if_hw_tsomaxsegcount,
874 				    ifp->if_hw_tsomaxsegsize);
875 			}
876 		}
877 #endif
878 	}
879 #ifdef VIMAGE
880 	else {
881 		/*
882 		 * Update the interface index in the link layer address
883 		 * of the interface.
884 		 */
885 		for (ifa = ifp->if_addr; ifa != NULL;
886 		    ifa = CK_STAILQ_NEXT(ifa, ifa_link)) {
887 			if (ifa->ifa_addr->sa_family == AF_LINK) {
888 				sdl = (struct sockaddr_dl *)ifa->ifa_addr;
889 				sdl->sdl_index = ifp->if_index;
890 			}
891 		}
892 	}
893 #endif
894 
895 	IFNET_WLOCK();
896 	CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
897 #ifdef VIMAGE
898 	curvnet->vnet_ifcnt++;
899 #endif
900 	IFNET_WUNLOCK();
901 
902 	if (domain_init_status >= 2)
903 		if_attachdomain1(ifp);
904 
905 	EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
906 	if (IS_DEFAULT_VNET(curvnet))
907 		devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
908 
909 	/* Announce the interface. */
910 	rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
911 }
912 
913 static void
914 if_epochalloc(void *dummy __unused)
915 {
916 
917 	net_epoch_preempt = epoch_alloc(EPOCH_PREEMPT);
918 	net_epoch = epoch_alloc(0);
919 }
920 SYSINIT(ifepochalloc, SI_SUB_TASKQ + 1, SI_ORDER_ANY,
921     if_epochalloc, NULL);
922 
923 static void
924 if_attachdomain(void *dummy)
925 {
926 	struct ifnet *ifp;
927 
928 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link)
929 		if_attachdomain1(ifp);
930 }
931 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
932     if_attachdomain, NULL);
933 
934 static void
935 if_attachdomain1(struct ifnet *ifp)
936 {
937 	struct domain *dp;
938 
939 	/*
940 	 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
941 	 * cannot lock ifp->if_afdata initialization, entirely.
942 	 */
943 	IF_AFDATA_LOCK(ifp);
944 	if (ifp->if_afdata_initialized >= domain_init_status) {
945 		IF_AFDATA_UNLOCK(ifp);
946 		log(LOG_WARNING, "%s called more than once on %s\n",
947 		    __func__, ifp->if_xname);
948 		return;
949 	}
950 	ifp->if_afdata_initialized = domain_init_status;
951 	IF_AFDATA_UNLOCK(ifp);
952 
953 	/* address family dependent data region */
954 	bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
955 	for (dp = domains; dp; dp = dp->dom_next) {
956 		if (dp->dom_ifattach)
957 			ifp->if_afdata[dp->dom_family] =
958 			    (*dp->dom_ifattach)(ifp);
959 	}
960 }
961 
962 /*
963  * Remove any unicast or broadcast network addresses from an interface.
964  */
965 void
966 if_purgeaddrs(struct ifnet *ifp)
967 {
968 	struct ifaddr *ifa, *next;
969 
970 	NET_EPOCH_ENTER();
971 	CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
972 		if (ifa->ifa_addr->sa_family == AF_LINK)
973 			continue;
974 #ifdef INET
975 		/* XXX: Ugly!! ad hoc just for INET */
976 		if (ifa->ifa_addr->sa_family == AF_INET) {
977 			struct ifaliasreq ifr;
978 
979 			bzero(&ifr, sizeof(ifr));
980 			ifr.ifra_addr = *ifa->ifa_addr;
981 			if (ifa->ifa_dstaddr)
982 				ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
983 			if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
984 			    NULL) == 0)
985 				continue;
986 		}
987 #endif /* INET */
988 #ifdef INET6
989 		if (ifa->ifa_addr->sa_family == AF_INET6) {
990 			in6_purgeaddr(ifa);
991 			/* ifp_addrhead is already updated */
992 			continue;
993 		}
994 #endif /* INET6 */
995 		IF_ADDR_WLOCK(ifp);
996 		CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
997 		IF_ADDR_WUNLOCK(ifp);
998 		ifa_free(ifa);
999 	}
1000 	NET_EPOCH_EXIT();
1001 }
1002 
1003 /*
1004  * Remove any multicast network addresses from an interface when an ifnet
1005  * is going away.
1006  */
1007 static void
1008 if_purgemaddrs(struct ifnet *ifp)
1009 {
1010 	struct ifmultiaddr *ifma;
1011 
1012 	IF_ADDR_WLOCK(ifp);
1013 	while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) {
1014 		ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs);
1015 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
1016 		if_delmulti_locked(ifp, ifma, 1);
1017 	}
1018 	IF_ADDR_WUNLOCK(ifp);
1019 }
1020 
1021 /*
1022  * Detach an interface, removing it from the list of "active" interfaces.
1023  * If vmove flag is set on entry to if_detach_internal(), perform only a
1024  * limited subset of cleanup tasks, given that we are moving an ifnet from
1025  * one vnet to another, where it must be fully operational.
1026  *
1027  * XXXRW: There are some significant questions about event ordering, and
1028  * how to prevent things from starting to use the interface during detach.
1029  */
1030 void
1031 if_detach(struct ifnet *ifp)
1032 {
1033 
1034 	CURVNET_SET_QUIET(ifp->if_vnet);
1035 	if_detach_internal(ifp, 0, NULL);
1036 	CURVNET_RESTORE();
1037 }
1038 
1039 /*
1040  * The vmove flag, if set, indicates that we are called from a callpath
1041  * that is moving an interface to a different vnet instance.
1042  *
1043  * The shutdown flag, if set, indicates that we are called in the
1044  * process of shutting down a vnet instance.  Currently only the
1045  * vnet_if_return SYSUNINIT function sets it.  Note: we can be called
1046  * on a vnet instance shutdown without this flag being set, e.g., when
1047  * the cloned interfaces are destoyed as first thing of teardown.
1048  */
1049 static int
1050 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp)
1051 {
1052 	struct ifaddr *ifa;
1053 	int i;
1054 	struct domain *dp;
1055  	struct ifnet *iter;
1056  	int found = 0;
1057 #ifdef VIMAGE
1058 	int shutdown;
1059 
1060 	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
1061 		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
1062 #endif
1063 	IFNET_WLOCK();
1064 	CK_STAILQ_FOREACH(iter, &V_ifnet, if_link)
1065 		if (iter == ifp) {
1066 			CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link);
1067 			found = 1;
1068 			break;
1069 		}
1070 	IFNET_WUNLOCK();
1071 	if (!found) {
1072 		/*
1073 		 * While we would want to panic here, we cannot
1074 		 * guarantee that the interface is indeed still on
1075 		 * the list given we don't hold locks all the way.
1076 		 */
1077 		return (ENOENT);
1078 #if 0
1079 		if (vmove)
1080 			panic("%s: ifp=%p not on the ifnet tailq %p",
1081 			    __func__, ifp, &V_ifnet);
1082 		else
1083 			return; /* XXX this should panic as well? */
1084 #endif
1085 	}
1086 
1087 	/*
1088 	 * At this point we know the interface still was on the ifnet list
1089 	 * and we removed it so we are in a stable state.
1090 	 */
1091 #ifdef VIMAGE
1092 	curvnet->vnet_ifcnt--;
1093 #endif
1094 	epoch_wait_preempt(net_epoch_preempt);
1095 	/*
1096 	 * In any case (destroy or vmove) detach us from the groups
1097 	 * and remove/wait for pending events on the taskq.
1098 	 * XXX-BZ in theory an interface could still enqueue a taskq change?
1099 	 */
1100 	if_delgroups(ifp);
1101 
1102 	taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
1103 
1104 	/*
1105 	 * Check if this is a cloned interface or not. Must do even if
1106 	 * shutting down as a if_vmove_reclaim() would move the ifp and
1107 	 * the if_clone_addgroup() will have a corrupted string overwise
1108 	 * from a gibberish pointer.
1109 	 */
1110 	if (vmove && ifcp != NULL)
1111 		*ifcp = if_clone_findifc(ifp);
1112 
1113 	if_down(ifp);
1114 
1115 #ifdef VIMAGE
1116 	/*
1117 	 * On VNET shutdown abort here as the stack teardown will do all
1118 	 * the work top-down for us.
1119 	 */
1120 	if (shutdown) {
1121 		/*
1122 		 * In case of a vmove we are done here without error.
1123 		 * If we would signal an error it would lead to the same
1124 		 * abort as if we did not find the ifnet anymore.
1125 		 * if_detach() calls us in void context and does not care
1126 		 * about an early abort notification, so life is splendid :)
1127 		 */
1128 		goto finish_vnet_shutdown;
1129 	}
1130 #endif
1131 
1132 	/*
1133 	 * At this point we are not tearing down a VNET and are either
1134 	 * going to destroy or vmove the interface and have to cleanup
1135 	 * accordingly.
1136 	 */
1137 
1138 	/*
1139 	 * Remove routes and flush queues.
1140 	 */
1141 #ifdef ALTQ
1142 	if (ALTQ_IS_ENABLED(&ifp->if_snd))
1143 		altq_disable(&ifp->if_snd);
1144 	if (ALTQ_IS_ATTACHED(&ifp->if_snd))
1145 		altq_detach(&ifp->if_snd);
1146 #endif
1147 
1148 	if_purgeaddrs(ifp);
1149 
1150 #ifdef INET
1151 	in_ifdetach(ifp);
1152 #endif
1153 
1154 #ifdef INET6
1155 	/*
1156 	 * Remove all IPv6 kernel structs related to ifp.  This should be done
1157 	 * before removing routing entries below, since IPv6 interface direct
1158 	 * routes are expected to be removed by the IPv6-specific kernel API.
1159 	 * Otherwise, the kernel will detect some inconsistency and bark it.
1160 	 */
1161 	in6_ifdetach(ifp);
1162 #endif
1163 	if_purgemaddrs(ifp);
1164 
1165 	/* Announce that the interface is gone. */
1166 	rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1167 	EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1168 	if (IS_DEFAULT_VNET(curvnet))
1169 		devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
1170 
1171 	if (!vmove) {
1172 		/*
1173 		 * Prevent further calls into the device driver via ifnet.
1174 		 */
1175 		if_dead(ifp);
1176 
1177 		/*
1178 		 * Remove link ifaddr pointer and maybe decrement if_index.
1179 		 * Clean up all addresses.
1180 		 */
1181 		free(ifp->if_hw_addr, M_IFADDR);
1182 		ifp->if_hw_addr = NULL;
1183 		ifp->if_addr = NULL;
1184 
1185 		/* We can now free link ifaddr. */
1186 		IF_ADDR_WLOCK(ifp);
1187 		if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) {
1188 			ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
1189 			CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
1190 			IF_ADDR_WUNLOCK(ifp);
1191 			ifa_free(ifa);
1192 		} else
1193 			IF_ADDR_WUNLOCK(ifp);
1194 	}
1195 
1196 	rt_flushifroutes(ifp);
1197 
1198 #ifdef VIMAGE
1199 finish_vnet_shutdown:
1200 #endif
1201 	/*
1202 	 * We cannot hold the lock over dom_ifdetach calls as they might
1203 	 * sleep, for example trying to drain a callout, thus open up the
1204 	 * theoretical race with re-attaching.
1205 	 */
1206 	IF_AFDATA_LOCK(ifp);
1207 	i = ifp->if_afdata_initialized;
1208 	ifp->if_afdata_initialized = 0;
1209 	IF_AFDATA_UNLOCK(ifp);
1210 	for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
1211 		if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) {
1212 			(*dp->dom_ifdetach)(ifp,
1213 			    ifp->if_afdata[dp->dom_family]);
1214 			ifp->if_afdata[dp->dom_family] = NULL;
1215 		}
1216 	}
1217 
1218 	return (0);
1219 }
1220 
1221 #ifdef VIMAGE
1222 /*
1223  * if_vmove() performs a limited version of if_detach() in current
1224  * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
1225  * An attempt is made to shrink if_index in current vnet, find an
1226  * unused if_index in target vnet and calls if_grow() if necessary,
1227  * and finally find an unused if_xname for the target vnet.
1228  */
1229 static void
1230 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
1231 {
1232 	struct if_clone *ifc;
1233 	u_int bif_dlt, bif_hdrlen;
1234 	void *old;
1235 	int rc;
1236 
1237  	/*
1238 	 * if_detach_internal() will call the eventhandler to notify
1239 	 * interface departure.  That will detach if_bpf.  We need to
1240 	 * safe the dlt and hdrlen so we can re-attach it later.
1241 	 */
1242 	bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen);
1243 
1244 	/*
1245 	 * Detach from current vnet, but preserve LLADDR info, do not
1246 	 * mark as dead etc. so that the ifnet can be reattached later.
1247 	 * If we cannot find it, we lost the race to someone else.
1248 	 */
1249 	rc = if_detach_internal(ifp, 1, &ifc);
1250 	if (rc != 0)
1251 		return;
1252 
1253 	/*
1254 	 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
1255 	 * the if_index for that vnet if possible.
1256 	 *
1257 	 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
1258 	 * or we'd lock on one vnet and unlock on another.
1259 	 */
1260 	IFNET_WLOCK();
1261 	ifindex_free_locked(ifp->if_index);
1262 	IFNET_WUNLOCK();
1263 
1264 	/*
1265 	 * Perform interface-specific reassignment tasks, if provided by
1266 	 * the driver.
1267 	 */
1268 	if (ifp->if_reassign != NULL)
1269 		ifp->if_reassign(ifp, new_vnet, NULL);
1270 
1271 	/*
1272 	 * Switch to the context of the target vnet.
1273 	 */
1274 	CURVNET_SET_QUIET(new_vnet);
1275  restart:
1276 	IFNET_WLOCK();
1277 	ifp->if_index = ifindex_alloc(&old);
1278 	if (__predict_false(ifp->if_index == USHRT_MAX)) {
1279 		IFNET_WUNLOCK();
1280 		epoch_wait_preempt(net_epoch_preempt);
1281 		free(old, M_IFNET);
1282 		goto restart;
1283 	}
1284 	ifnet_setbyindex(ifp->if_index, ifp);
1285 	IFNET_WUNLOCK();
1286 
1287 	if_attach_internal(ifp, 1, ifc);
1288 
1289 	if (ifp->if_bpf == NULL)
1290 		bpfattach(ifp, bif_dlt, bif_hdrlen);
1291 
1292 	CURVNET_RESTORE();
1293 }
1294 
1295 /*
1296  * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1297  */
1298 static int
1299 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1300 {
1301 	struct prison *pr;
1302 	struct ifnet *difp;
1303 	int shutdown;
1304 
1305 	/* Try to find the prison within our visibility. */
1306 	sx_slock(&allprison_lock);
1307 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1308 	sx_sunlock(&allprison_lock);
1309 	if (pr == NULL)
1310 		return (ENXIO);
1311 	prison_hold_locked(pr);
1312 	mtx_unlock(&pr->pr_mtx);
1313 
1314 	/* Do not try to move the iface from and to the same prison. */
1315 	if (pr->pr_vnet == ifp->if_vnet) {
1316 		prison_free(pr);
1317 		return (EEXIST);
1318 	}
1319 
1320 	/* Make sure the named iface does not exists in the dst. prison/vnet. */
1321 	/* XXX Lock interfaces to avoid races. */
1322 	CURVNET_SET_QUIET(pr->pr_vnet);
1323 	difp = ifunit(ifname);
1324 	if (difp != NULL) {
1325 		CURVNET_RESTORE();
1326 		prison_free(pr);
1327 		return (EEXIST);
1328 	}
1329 
1330 	/* Make sure the VNET is stable. */
1331 	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
1332 		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
1333 	if (shutdown) {
1334 		CURVNET_RESTORE();
1335 		prison_free(pr);
1336 		return (EBUSY);
1337 	}
1338 	CURVNET_RESTORE();
1339 
1340 	/* Move the interface into the child jail/vnet. */
1341 	if_vmove(ifp, pr->pr_vnet);
1342 
1343 	/* Report the new if_xname back to the userland. */
1344 	sprintf(ifname, "%s", ifp->if_xname);
1345 
1346 	prison_free(pr);
1347 	return (0);
1348 }
1349 
1350 static int
1351 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1352 {
1353 	struct prison *pr;
1354 	struct vnet *vnet_dst;
1355 	struct ifnet *ifp;
1356  	int shutdown;
1357 
1358 	/* Try to find the prison within our visibility. */
1359 	sx_slock(&allprison_lock);
1360 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1361 	sx_sunlock(&allprison_lock);
1362 	if (pr == NULL)
1363 		return (ENXIO);
1364 	prison_hold_locked(pr);
1365 	mtx_unlock(&pr->pr_mtx);
1366 
1367 	/* Make sure the named iface exists in the source prison/vnet. */
1368 	CURVNET_SET(pr->pr_vnet);
1369 	ifp = ifunit(ifname);		/* XXX Lock to avoid races. */
1370 	if (ifp == NULL) {
1371 		CURVNET_RESTORE();
1372 		prison_free(pr);
1373 		return (ENXIO);
1374 	}
1375 
1376 	/* Do not try to move the iface from and to the same prison. */
1377 	vnet_dst = TD_TO_VNET(td);
1378 	if (vnet_dst == ifp->if_vnet) {
1379 		CURVNET_RESTORE();
1380 		prison_free(pr);
1381 		return (EEXIST);
1382 	}
1383 
1384 	/* Make sure the VNET is stable. */
1385 	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
1386 		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
1387 	if (shutdown) {
1388 		CURVNET_RESTORE();
1389 		prison_free(pr);
1390 		return (EBUSY);
1391 	}
1392 
1393 	/* Get interface back from child jail/vnet. */
1394 	if_vmove(ifp, vnet_dst);
1395 	CURVNET_RESTORE();
1396 
1397 	/* Report the new if_xname back to the userland. */
1398 	sprintf(ifname, "%s", ifp->if_xname);
1399 
1400 	prison_free(pr);
1401 	return (0);
1402 }
1403 #endif /* VIMAGE */
1404 
1405 /*
1406  * Add a group to an interface
1407  */
1408 int
1409 if_addgroup(struct ifnet *ifp, const char *groupname)
1410 {
1411 	struct ifg_list		*ifgl;
1412 	struct ifg_group	*ifg = NULL;
1413 	struct ifg_member	*ifgm;
1414 	int 			 new = 0;
1415 
1416 	if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
1417 	    groupname[strlen(groupname) - 1] <= '9')
1418 		return (EINVAL);
1419 
1420 	IFNET_WLOCK();
1421 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1422 		if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1423 			IFNET_WUNLOCK();
1424 			return (EEXIST);
1425 		}
1426 
1427 	if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP,
1428 	    M_NOWAIT)) == NULL) {
1429 	    	IFNET_WUNLOCK();
1430 		return (ENOMEM);
1431 	}
1432 
1433 	if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member),
1434 	    M_TEMP, M_NOWAIT)) == NULL) {
1435 		free(ifgl, M_TEMP);
1436 		IFNET_WUNLOCK();
1437 		return (ENOMEM);
1438 	}
1439 
1440 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1441 		if (!strcmp(ifg->ifg_group, groupname))
1442 			break;
1443 
1444 	if (ifg == NULL) {
1445 		if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group),
1446 		    M_TEMP, M_NOWAIT)) == NULL) {
1447 			free(ifgl, M_TEMP);
1448 			free(ifgm, M_TEMP);
1449 			IFNET_WUNLOCK();
1450 			return (ENOMEM);
1451 		}
1452 		strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1453 		ifg->ifg_refcnt = 0;
1454 		CK_STAILQ_INIT(&ifg->ifg_members);
1455 		CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1456 		new = 1;
1457 	}
1458 
1459 	ifg->ifg_refcnt++;
1460 	ifgl->ifgl_group = ifg;
1461 	ifgm->ifgm_ifp = ifp;
1462 
1463 	IF_ADDR_WLOCK(ifp);
1464 	CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1465 	CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1466 	IF_ADDR_WUNLOCK(ifp);
1467 
1468 	IFNET_WUNLOCK();
1469 
1470 	if (new)
1471 		EVENTHANDLER_INVOKE(group_attach_event, ifg);
1472 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1473 
1474 	return (0);
1475 }
1476 
1477 /*
1478  * Remove a group from an interface
1479  */
1480 int
1481 if_delgroup(struct ifnet *ifp, const char *groupname)
1482 {
1483 	struct ifg_list		*ifgl;
1484 	struct ifg_member	*ifgm;
1485 	int freeifgl;
1486 
1487 	IFNET_WLOCK();
1488 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1489 		if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
1490 			break;
1491 	if (ifgl == NULL) {
1492 		IFNET_WUNLOCK();
1493 		return (ENOENT);
1494 	}
1495 
1496 	freeifgl = 0;
1497 	IF_ADDR_WLOCK(ifp);
1498 	CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next);
1499 	IF_ADDR_WUNLOCK(ifp);
1500 
1501 	CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1502 		if (ifgm->ifgm_ifp == ifp)
1503 			break;
1504 
1505 	if (ifgm != NULL)
1506 		CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member, ifgm_next);
1507 
1508 	if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1509 		CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next);
1510 		freeifgl = 1;
1511 	}
1512 	IFNET_WUNLOCK();
1513 
1514 	epoch_wait_preempt(net_epoch_preempt);
1515 	if (freeifgl) {
1516 		EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1517 		free(ifgl->ifgl_group, M_TEMP);
1518 	}
1519 	free(ifgm, M_TEMP);
1520 	free(ifgl, M_TEMP);
1521 
1522 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1523 
1524 	return (0);
1525 }
1526 
1527 /*
1528  * Remove an interface from all groups
1529  */
1530 static void
1531 if_delgroups(struct ifnet *ifp)
1532 {
1533 	struct ifg_list		*ifgl;
1534 	struct ifg_member	*ifgm;
1535 	char groupname[IFNAMSIZ];
1536 	int ifglfree;
1537 
1538 	IFNET_WLOCK();
1539 	while (!CK_STAILQ_EMPTY(&ifp->if_groups)) {
1540 		ifgl = CK_STAILQ_FIRST(&ifp->if_groups);
1541 
1542 		strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1543 
1544 		IF_ADDR_WLOCK(ifp);
1545 		CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next);
1546 		IF_ADDR_WUNLOCK(ifp);
1547 
1548 		CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
1549 			if (ifgm->ifgm_ifp == ifp)
1550 				break;
1551 
1552 		if (ifgm != NULL)
1553 			CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifg_member,
1554 			    ifgm_next);
1555 		ifglfree = 0;
1556 		if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1557 			CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next);
1558 			ifglfree = 1;
1559 		}
1560 
1561 		IFNET_WUNLOCK();
1562 		epoch_wait_preempt(net_epoch_preempt);
1563 		free(ifgm, M_TEMP);
1564 		if (ifglfree) {
1565 			EVENTHANDLER_INVOKE(group_detach_event,
1566 								ifgl->ifgl_group);
1567 			free(ifgl->ifgl_group, M_TEMP);
1568 		}
1569 		EVENTHANDLER_INVOKE(group_change_event, groupname);
1570 
1571 		IFNET_WLOCK();
1572 	}
1573 	IFNET_WUNLOCK();
1574 }
1575 
1576 static char *
1577 ifgr_group_get(void *ifgrp)
1578 {
1579 	union ifgroupreq_union *ifgrup;
1580 
1581 	ifgrup = ifgrp;
1582 #ifdef COMPAT_FREEBSD32
1583 	if (SV_CURPROC_FLAG(SV_ILP32))
1584 		return (&ifgrup->ifgr32.ifgr_ifgru.ifgru_group[0]);
1585 #endif
1586 	return (&ifgrup->ifgr.ifgr_ifgru.ifgru_group[0]);
1587 }
1588 
1589 static struct ifg_req *
1590 ifgr_groups_get(void *ifgrp)
1591 {
1592 	union ifgroupreq_union *ifgrup;
1593 
1594 	ifgrup = ifgrp;
1595 #ifdef COMPAT_FREEBSD32
1596 	if (SV_CURPROC_FLAG(SV_ILP32))
1597 		return ((struct ifg_req *)(uintptr_t)
1598 		    ifgrup->ifgr32.ifgr_ifgru.ifgru_groups);
1599 #endif
1600 	return (ifgrup->ifgr.ifgr_ifgru.ifgru_groups);
1601 }
1602 
1603 /*
1604  * Stores all groups from an interface in memory pointed to by ifgr.
1605  */
1606 static int
1607 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp)
1608 {
1609 	int			 len, error;
1610 	struct ifg_list		*ifgl;
1611 	struct ifg_req		 ifgrq, *ifgp;
1612 
1613 	if (ifgr->ifgr_len == 0) {
1614 		IF_ADDR_RLOCK(ifp);
1615 		CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1616 			ifgr->ifgr_len += sizeof(struct ifg_req);
1617 		IF_ADDR_RUNLOCK(ifp);
1618 		return (0);
1619 	}
1620 
1621 	len = ifgr->ifgr_len;
1622 	ifgp = ifgr_groups_get(ifgr);
1623 	/* XXX: wire */
1624 	IF_ADDR_RLOCK(ifp);
1625 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1626 		if (len < sizeof(ifgrq)) {
1627 			IF_ADDR_RUNLOCK(ifp);
1628 			return (EINVAL);
1629 		}
1630 		bzero(&ifgrq, sizeof ifgrq);
1631 		strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1632 		    sizeof(ifgrq.ifgrq_group));
1633 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1634 		    	IF_ADDR_RUNLOCK(ifp);
1635 			return (error);
1636 		}
1637 		len -= sizeof(ifgrq);
1638 		ifgp++;
1639 	}
1640 	IF_ADDR_RUNLOCK(ifp);
1641 
1642 	return (0);
1643 }
1644 
1645 /*
1646  * Stores all members of a group in memory pointed to by igfr
1647  */
1648 static int
1649 if_getgroupmembers(struct ifgroupreq *ifgr)
1650 {
1651 	struct ifg_group	*ifg;
1652 	struct ifg_member	*ifgm;
1653 	struct ifg_req		 ifgrq, *ifgp;
1654 	int			 len, error;
1655 
1656 	IFNET_RLOCK();
1657 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1658 		if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
1659 			break;
1660 	if (ifg == NULL) {
1661 		IFNET_RUNLOCK();
1662 		return (ENOENT);
1663 	}
1664 
1665 	if (ifgr->ifgr_len == 0) {
1666 		CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1667 			ifgr->ifgr_len += sizeof(ifgrq);
1668 		IFNET_RUNLOCK();
1669 		return (0);
1670 	}
1671 
1672 	len = ifgr->ifgr_len;
1673 	ifgp = ifgr_groups_get(ifgr);
1674 	CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1675 		if (len < sizeof(ifgrq)) {
1676 			IFNET_RUNLOCK();
1677 			return (EINVAL);
1678 		}
1679 		bzero(&ifgrq, sizeof ifgrq);
1680 		strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1681 		    sizeof(ifgrq.ifgrq_member));
1682 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1683 			IFNET_RUNLOCK();
1684 			return (error);
1685 		}
1686 		len -= sizeof(ifgrq);
1687 		ifgp++;
1688 	}
1689 	IFNET_RUNLOCK();
1690 
1691 	return (0);
1692 }
1693 
1694 /*
1695  * Return counter values from counter(9)s stored in ifnet.
1696  */
1697 uint64_t
1698 if_get_counter_default(struct ifnet *ifp, ift_counter cnt)
1699 {
1700 
1701 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1702 
1703 	return (counter_u64_fetch(ifp->if_counters[cnt]));
1704 }
1705 
1706 /*
1707  * Increase an ifnet counter. Usually used for counters shared
1708  * between the stack and a driver, but function supports them all.
1709  */
1710 void
1711 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc)
1712 {
1713 
1714 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1715 
1716 	counter_u64_add(ifp->if_counters[cnt], inc);
1717 }
1718 
1719 /*
1720  * Copy data from ifnet to userland API structure if_data.
1721  */
1722 void
1723 if_data_copy(struct ifnet *ifp, struct if_data *ifd)
1724 {
1725 
1726 	ifd->ifi_type = ifp->if_type;
1727 	ifd->ifi_physical = 0;
1728 	ifd->ifi_addrlen = ifp->if_addrlen;
1729 	ifd->ifi_hdrlen = ifp->if_hdrlen;
1730 	ifd->ifi_link_state = ifp->if_link_state;
1731 	ifd->ifi_vhid = 0;
1732 	ifd->ifi_datalen = sizeof(struct if_data);
1733 	ifd->ifi_mtu = ifp->if_mtu;
1734 	ifd->ifi_metric = ifp->if_metric;
1735 	ifd->ifi_baudrate = ifp->if_baudrate;
1736 	ifd->ifi_hwassist = ifp->if_hwassist;
1737 	ifd->ifi_epoch = ifp->if_epoch;
1738 	ifd->ifi_lastchange = ifp->if_lastchange;
1739 
1740 	ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS);
1741 	ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS);
1742 	ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS);
1743 	ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS);
1744 	ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS);
1745 	ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES);
1746 	ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES);
1747 	ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS);
1748 	ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS);
1749 	ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS);
1750 	ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
1751 	ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO);
1752 }
1753 
1754 /*
1755  * Wrapper functions for struct ifnet address list locking macros.  These are
1756  * used by kernel modules to avoid encoding programming interface or binary
1757  * interface assumptions that may be violated when kernel-internal locking
1758  * approaches change.
1759  */
1760 void
1761 if_addr_rlock(struct ifnet *ifp)
1762 {
1763 	MPASS(*(uint64_t *)&ifp->if_addr_et == 0);
1764 	epoch_enter_preempt(net_epoch_preempt, &ifp->if_addr_et);
1765 }
1766 
1767 void
1768 if_addr_runlock(struct ifnet *ifp)
1769 {
1770 	epoch_exit_preempt(net_epoch_preempt, &ifp->if_addr_et);
1771 #ifdef INVARIANTS
1772 	bzero(&ifp->if_addr_et, sizeof(struct epoch_tracker));
1773 #endif
1774 }
1775 
1776 void
1777 if_maddr_rlock(if_t ifp)
1778 {
1779 
1780 	MPASS(*(uint64_t *)&ifp->if_maddr_et == 0);
1781 	epoch_enter_preempt(net_epoch_preempt, &ifp->if_maddr_et);
1782 }
1783 
1784 void
1785 if_maddr_runlock(if_t ifp)
1786 {
1787 
1788 	epoch_exit_preempt(net_epoch_preempt, &ifp->if_maddr_et);
1789 #ifdef INVARIANTS
1790 	bzero(&ifp->if_maddr_et, sizeof(struct epoch_tracker));
1791 #endif
1792 }
1793 
1794 /*
1795  * Initialization, destruction and refcounting functions for ifaddrs.
1796  */
1797 struct ifaddr *
1798 ifa_alloc(size_t size, int flags)
1799 {
1800 	struct ifaddr *ifa;
1801 
1802 	KASSERT(size >= sizeof(struct ifaddr),
1803 	    ("%s: invalid size %zu", __func__, size));
1804 
1805 	ifa = malloc(size, M_IFADDR, M_ZERO | flags);
1806 	if (ifa == NULL)
1807 		return (NULL);
1808 
1809 	if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL)
1810 		goto fail;
1811 	if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL)
1812 		goto fail;
1813 	if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL)
1814 		goto fail;
1815 	if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL)
1816 		goto fail;
1817 
1818 	refcount_init(&ifa->ifa_refcnt, 1);
1819 
1820 	return (ifa);
1821 
1822 fail:
1823 	/* free(NULL) is okay */
1824 	counter_u64_free(ifa->ifa_opackets);
1825 	counter_u64_free(ifa->ifa_ipackets);
1826 	counter_u64_free(ifa->ifa_obytes);
1827 	counter_u64_free(ifa->ifa_ibytes);
1828 	free(ifa, M_IFADDR);
1829 
1830 	return (NULL);
1831 }
1832 
1833 void
1834 ifa_ref(struct ifaddr *ifa)
1835 {
1836 
1837 	refcount_acquire(&ifa->ifa_refcnt);
1838 }
1839 
1840 static void
1841 ifa_destroy(epoch_context_t ctx)
1842 {
1843 	struct ifaddr *ifa;
1844 
1845 	ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx);
1846 	counter_u64_free(ifa->ifa_opackets);
1847 	counter_u64_free(ifa->ifa_ipackets);
1848 	counter_u64_free(ifa->ifa_obytes);
1849 	counter_u64_free(ifa->ifa_ibytes);
1850 	free(ifa, M_IFADDR);
1851 }
1852 
1853 void
1854 ifa_free(struct ifaddr *ifa)
1855 {
1856 
1857 	if (refcount_release(&ifa->ifa_refcnt))
1858 		epoch_call(net_epoch_preempt, &ifa->ifa_epoch_ctx, ifa_destroy);
1859 }
1860 
1861 
1862 static int
1863 ifa_maintain_loopback_route(int cmd, const char *otype, struct ifaddr *ifa,
1864     struct sockaddr *ia)
1865 {
1866 	int error;
1867 	struct rt_addrinfo info;
1868 	struct sockaddr_dl null_sdl;
1869 	struct ifnet *ifp;
1870 
1871 	ifp = ifa->ifa_ifp;
1872 
1873 	bzero(&info, sizeof(info));
1874 	if (cmd != RTM_DELETE)
1875 		info.rti_ifp = V_loif;
1876 	info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED;
1877 	info.rti_info[RTAX_DST] = ia;
1878 	info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl;
1879 	link_init_sdl(ifp, (struct sockaddr *)&null_sdl, ifp->if_type);
1880 
1881 	error = rtrequest1_fib(cmd, &info, NULL, ifp->if_fib);
1882 
1883 	if (error != 0 &&
1884 	    !(cmd == RTM_ADD && error == EEXIST) &&
1885 	    !(cmd == RTM_DELETE && error == ENOENT))
1886 		if_printf(ifp, "%s failed: %d\n", otype, error);
1887 
1888 	return (error);
1889 }
1890 
1891 int
1892 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1893 {
1894 
1895 	return (ifa_maintain_loopback_route(RTM_ADD, "insertion", ifa, ia));
1896 }
1897 
1898 int
1899 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1900 {
1901 
1902 	return (ifa_maintain_loopback_route(RTM_DELETE, "deletion", ifa, ia));
1903 }
1904 
1905 int
1906 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *ia)
1907 {
1908 
1909 	return (ifa_maintain_loopback_route(RTM_CHANGE, "switch", ifa, ia));
1910 }
1911 
1912 /*
1913  * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1914  * structs used to represent other address families, it is necessary
1915  * to perform a different comparison.
1916  */
1917 
1918 #define	sa_dl_equal(a1, a2)	\
1919 	((((const struct sockaddr_dl *)(a1))->sdl_len ==		\
1920 	 ((const struct sockaddr_dl *)(a2))->sdl_len) &&		\
1921 	 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)),		\
1922 	       CLLADDR((const struct sockaddr_dl *)(a2)),		\
1923 	       ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1924 
1925 /*
1926  * Locate an interface based on a complete address.
1927  */
1928 /*ARGSUSED*/
1929 struct ifaddr *
1930 ifa_ifwithaddr(const struct sockaddr *addr)
1931 {
1932 	struct ifnet *ifp;
1933 	struct ifaddr *ifa;
1934 
1935 	MPASS(in_epoch(net_epoch_preempt));
1936 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1937 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1938 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1939 				continue;
1940 			if (sa_equal(addr, ifa->ifa_addr)) {
1941 				goto done;
1942 			}
1943 			/* IP6 doesn't have broadcast */
1944 			if ((ifp->if_flags & IFF_BROADCAST) &&
1945 			    ifa->ifa_broadaddr &&
1946 			    ifa->ifa_broadaddr->sa_len != 0 &&
1947 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1948 				goto done;
1949 			}
1950 		}
1951 	}
1952 	ifa = NULL;
1953 done:
1954 	return (ifa);
1955 }
1956 
1957 int
1958 ifa_ifwithaddr_check(const struct sockaddr *addr)
1959 {
1960 	int rc;
1961 
1962 	NET_EPOCH_ENTER();
1963 	rc = (ifa_ifwithaddr(addr) != NULL);
1964 	NET_EPOCH_EXIT();
1965 	return (rc);
1966 }
1967 
1968 /*
1969  * Locate an interface based on the broadcast address.
1970  */
1971 /* ARGSUSED */
1972 struct ifaddr *
1973 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum)
1974 {
1975 	struct ifnet *ifp;
1976 	struct ifaddr *ifa;
1977 
1978 	MPASS(in_epoch(net_epoch_preempt));
1979 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1980 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1981 			continue;
1982 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1983 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1984 				continue;
1985 			if ((ifp->if_flags & IFF_BROADCAST) &&
1986 			    ifa->ifa_broadaddr &&
1987 			    ifa->ifa_broadaddr->sa_len != 0 &&
1988 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1989 				goto done;
1990 			}
1991 		}
1992 	}
1993 	ifa = NULL;
1994 done:
1995 	return (ifa);
1996 }
1997 
1998 /*
1999  * Locate the point to point interface with a given destination address.
2000  */
2001 /*ARGSUSED*/
2002 struct ifaddr *
2003 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum)
2004 {
2005 	struct ifnet *ifp;
2006 	struct ifaddr *ifa;
2007 
2008 	MPASS(in_epoch(net_epoch_preempt));
2009 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2010 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
2011 			continue;
2012 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
2013 			continue;
2014 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2015 			if (ifa->ifa_addr->sa_family != addr->sa_family)
2016 				continue;
2017 			if (ifa->ifa_dstaddr != NULL &&
2018 			    sa_equal(addr, ifa->ifa_dstaddr)) {
2019 				goto done;
2020 			}
2021 		}
2022 	}
2023 	ifa = NULL;
2024 done:
2025 	return (ifa);
2026 }
2027 
2028 /*
2029  * Find an interface on a specific network.  If many, choice
2030  * is most specific found.
2031  */
2032 struct ifaddr *
2033 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum)
2034 {
2035 	struct ifnet *ifp;
2036 	struct ifaddr *ifa;
2037 	struct ifaddr *ifa_maybe = NULL;
2038 	u_int af = addr->sa_family;
2039 	const char *addr_data = addr->sa_data, *cplim;
2040 
2041 	MPASS(in_epoch(net_epoch_preempt));
2042 	/*
2043 	 * AF_LINK addresses can be looked up directly by their index number,
2044 	 * so do that if we can.
2045 	 */
2046 	if (af == AF_LINK) {
2047 	    const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr;
2048 	    if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
2049 		return (ifaddr_byindex(sdl->sdl_index));
2050 	}
2051 
2052 	/*
2053 	 * Scan though each interface, looking for ones that have addresses
2054 	 * in this address family and the requested fib.  Maintain a reference
2055 	 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that
2056 	 * kept it stable when we move onto the next interface.
2057 	 */
2058 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2059 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
2060 			continue;
2061 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2062 			const char *cp, *cp2, *cp3;
2063 
2064 			if (ifa->ifa_addr->sa_family != af)
2065 next:				continue;
2066 			if (af == AF_INET &&
2067 			    ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
2068 				/*
2069 				 * This is a bit broken as it doesn't
2070 				 * take into account that the remote end may
2071 				 * be a single node in the network we are
2072 				 * looking for.
2073 				 * The trouble is that we don't know the
2074 				 * netmask for the remote end.
2075 				 */
2076 				if (ifa->ifa_dstaddr != NULL &&
2077 				    sa_equal(addr, ifa->ifa_dstaddr)) {
2078 					goto done;
2079 				}
2080 			} else {
2081 				/*
2082 				 * Scan all the bits in the ifa's address.
2083 				 * If a bit dissagrees with what we are
2084 				 * looking for, mask it with the netmask
2085 				 * to see if it really matters.
2086 				 * (A byte at a time)
2087 				 */
2088 				if (ifa->ifa_netmask == 0)
2089 					continue;
2090 				cp = addr_data;
2091 				cp2 = ifa->ifa_addr->sa_data;
2092 				cp3 = ifa->ifa_netmask->sa_data;
2093 				cplim = ifa->ifa_netmask->sa_len
2094 					+ (char *)ifa->ifa_netmask;
2095 				while (cp3 < cplim)
2096 					if ((*cp++ ^ *cp2++) & *cp3++)
2097 						goto next; /* next address! */
2098 				/*
2099 				 * If the netmask of what we just found
2100 				 * is more specific than what we had before
2101 				 * (if we had one), or if the virtual status
2102 				 * of new prefix is better than of the old one,
2103 				 * then remember the new one before continuing
2104 				 * to search for an even better one.
2105 				 */
2106 				if (ifa_maybe == NULL ||
2107 				    ifa_preferred(ifa_maybe, ifa) ||
2108 				    rn_refines((caddr_t)ifa->ifa_netmask,
2109 				    (caddr_t)ifa_maybe->ifa_netmask)) {
2110 					ifa_maybe = ifa;
2111 				}
2112 			}
2113 		}
2114 	}
2115 	ifa = ifa_maybe;
2116 	ifa_maybe = NULL;
2117 done:
2118 	return (ifa);
2119 }
2120 
2121 /*
2122  * Find an interface address specific to an interface best matching
2123  * a given address.
2124  */
2125 struct ifaddr *
2126 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp)
2127 {
2128 	struct ifaddr *ifa;
2129 	const char *cp, *cp2, *cp3;
2130 	char *cplim;
2131 	struct ifaddr *ifa_maybe = NULL;
2132 	u_int af = addr->sa_family;
2133 
2134 	if (af >= AF_MAX)
2135 		return (NULL);
2136 
2137 	MPASS(in_epoch(net_epoch_preempt));
2138 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2139 		if (ifa->ifa_addr->sa_family != af)
2140 			continue;
2141 		if (ifa_maybe == NULL)
2142 			ifa_maybe = ifa;
2143 		if (ifa->ifa_netmask == 0) {
2144 			if (sa_equal(addr, ifa->ifa_addr) ||
2145 			    (ifa->ifa_dstaddr &&
2146 			    sa_equal(addr, ifa->ifa_dstaddr)))
2147 				goto done;
2148 			continue;
2149 		}
2150 		if (ifp->if_flags & IFF_POINTOPOINT) {
2151 			if (sa_equal(addr, ifa->ifa_dstaddr))
2152 				goto done;
2153 		} else {
2154 			cp = addr->sa_data;
2155 			cp2 = ifa->ifa_addr->sa_data;
2156 			cp3 = ifa->ifa_netmask->sa_data;
2157 			cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
2158 			for (; cp3 < cplim; cp3++)
2159 				if ((*cp++ ^ *cp2++) & *cp3)
2160 					break;
2161 			if (cp3 == cplim)
2162 				goto done;
2163 		}
2164 	}
2165 	ifa = ifa_maybe;
2166 done:
2167 	return (ifa);
2168 }
2169 
2170 /*
2171  * See whether new ifa is better than current one:
2172  * 1) A non-virtual one is preferred over virtual.
2173  * 2) A virtual in master state preferred over any other state.
2174  *
2175  * Used in several address selecting functions.
2176  */
2177 int
2178 ifa_preferred(struct ifaddr *cur, struct ifaddr *next)
2179 {
2180 
2181 	return (cur->ifa_carp && (!next->ifa_carp ||
2182 	    ((*carp_master_p)(next) && !(*carp_master_p)(cur))));
2183 }
2184 
2185 #include <net/if_llatbl.h>
2186 
2187 /*
2188  * Default action when installing a route with a Link Level gateway.
2189  * Lookup an appropriate real ifa to point to.
2190  * This should be moved to /sys/net/link.c eventually.
2191  */
2192 static void
2193 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
2194 {
2195 	struct ifaddr *ifa, *oifa;
2196 	struct sockaddr *dst;
2197 	struct ifnet *ifp;
2198 
2199 	if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) ||
2200 	    ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_key(rt)) == NULL))
2201 		return;
2202 	NET_EPOCH_ENTER();
2203 	ifa = ifaof_ifpforaddr(dst, ifp);
2204 	if (ifa) {
2205 		oifa = rt->rt_ifa;
2206 		if (oifa != ifa) {
2207 			ifa_free(oifa);
2208 			ifa_ref(ifa);
2209 		}
2210 		rt->rt_ifa = ifa;
2211 		if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
2212 			ifa->ifa_rtrequest(cmd, rt, info);
2213 	}
2214 	NET_EPOCH_EXIT();
2215 }
2216 
2217 struct sockaddr_dl *
2218 link_alloc_sdl(size_t size, int flags)
2219 {
2220 
2221 	return (malloc(size, M_TEMP, flags));
2222 }
2223 
2224 void
2225 link_free_sdl(struct sockaddr *sa)
2226 {
2227 	free(sa, M_TEMP);
2228 }
2229 
2230 /*
2231  * Fills in given sdl with interface basic info.
2232  * Returns pointer to filled sdl.
2233  */
2234 struct sockaddr_dl *
2235 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype)
2236 {
2237 	struct sockaddr_dl *sdl;
2238 
2239 	sdl = (struct sockaddr_dl *)paddr;
2240 	memset(sdl, 0, sizeof(struct sockaddr_dl));
2241 	sdl->sdl_len = sizeof(struct sockaddr_dl);
2242 	sdl->sdl_family = AF_LINK;
2243 	sdl->sdl_index = ifp->if_index;
2244 	sdl->sdl_type = iftype;
2245 
2246 	return (sdl);
2247 }
2248 
2249 /*
2250  * Mark an interface down and notify protocols of
2251  * the transition.
2252  */
2253 static void
2254 if_unroute(struct ifnet *ifp, int flag, int fam)
2255 {
2256 	struct ifaddr *ifa;
2257 
2258 	KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
2259 
2260 	ifp->if_flags &= ~flag;
2261 	getmicrotime(&ifp->if_lastchange);
2262 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2263 		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2264 			pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
2265 	ifp->if_qflush(ifp);
2266 
2267 	if (ifp->if_carp)
2268 		(*carp_linkstate_p)(ifp);
2269 	rt_ifmsg(ifp);
2270 }
2271 
2272 /*
2273  * Mark an interface up and notify protocols of
2274  * the transition.
2275  */
2276 static void
2277 if_route(struct ifnet *ifp, int flag, int fam)
2278 {
2279 	struct ifaddr *ifa;
2280 
2281 	KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
2282 
2283 	ifp->if_flags |= flag;
2284 	getmicrotime(&ifp->if_lastchange);
2285 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2286 		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2287 			pfctlinput(PRC_IFUP, ifa->ifa_addr);
2288 	if (ifp->if_carp)
2289 		(*carp_linkstate_p)(ifp);
2290 	rt_ifmsg(ifp);
2291 #ifdef INET6
2292 	in6_if_up(ifp);
2293 #endif
2294 }
2295 
2296 void	(*vlan_link_state_p)(struct ifnet *);	/* XXX: private from if_vlan */
2297 void	(*vlan_trunk_cap_p)(struct ifnet *);		/* XXX: private from if_vlan */
2298 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
2299 struct	ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
2300 int	(*vlan_tag_p)(struct ifnet *, uint16_t *);
2301 int	(*vlan_setcookie_p)(struct ifnet *, void *);
2302 void	*(*vlan_cookie_p)(struct ifnet *);
2303 
2304 /*
2305  * Handle a change in the interface link state. To avoid LORs
2306  * between driver lock and upper layer locks, as well as possible
2307  * recursions, we post event to taskqueue, and all job
2308  * is done in static do_link_state_change().
2309  */
2310 void
2311 if_link_state_change(struct ifnet *ifp, int link_state)
2312 {
2313 	/* Return if state hasn't changed. */
2314 	if (ifp->if_link_state == link_state)
2315 		return;
2316 
2317 	ifp->if_link_state = link_state;
2318 
2319 	taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
2320 }
2321 
2322 static void
2323 do_link_state_change(void *arg, int pending)
2324 {
2325 	struct ifnet *ifp = (struct ifnet *)arg;
2326 	int link_state = ifp->if_link_state;
2327 	CURVNET_SET(ifp->if_vnet);
2328 
2329 	/* Notify that the link state has changed. */
2330 	rt_ifmsg(ifp);
2331 	if (ifp->if_vlantrunk != NULL)
2332 		(*vlan_link_state_p)(ifp);
2333 
2334 	if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
2335 	    ifp->if_l2com != NULL)
2336 		(*ng_ether_link_state_p)(ifp, link_state);
2337 	if (ifp->if_carp)
2338 		(*carp_linkstate_p)(ifp);
2339 	if (ifp->if_bridge)
2340 		ifp->if_bridge_linkstate(ifp);
2341 	if (ifp->if_lagg)
2342 		(*lagg_linkstate_p)(ifp, link_state);
2343 
2344 	if (IS_DEFAULT_VNET(curvnet))
2345 		devctl_notify("IFNET", ifp->if_xname,
2346 		    (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
2347 		    NULL);
2348 	if (pending > 1)
2349 		if_printf(ifp, "%d link states coalesced\n", pending);
2350 	if (log_link_state_change)
2351 		if_printf(ifp, "link state changed to %s\n",
2352 		    (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
2353 	EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state);
2354 	CURVNET_RESTORE();
2355 }
2356 
2357 /*
2358  * Mark an interface down and notify protocols of
2359  * the transition.
2360  */
2361 void
2362 if_down(struct ifnet *ifp)
2363 {
2364 
2365 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
2366 	if_unroute(ifp, IFF_UP, AF_UNSPEC);
2367 }
2368 
2369 /*
2370  * Mark an interface up and notify protocols of
2371  * the transition.
2372  */
2373 void
2374 if_up(struct ifnet *ifp)
2375 {
2376 
2377 	if_route(ifp, IFF_UP, AF_UNSPEC);
2378 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
2379 }
2380 
2381 /*
2382  * Flush an interface queue.
2383  */
2384 void
2385 if_qflush(struct ifnet *ifp)
2386 {
2387 	struct mbuf *m, *n;
2388 	struct ifaltq *ifq;
2389 
2390 	ifq = &ifp->if_snd;
2391 	IFQ_LOCK(ifq);
2392 #ifdef ALTQ
2393 	if (ALTQ_IS_ENABLED(ifq))
2394 		ALTQ_PURGE(ifq);
2395 #endif
2396 	n = ifq->ifq_head;
2397 	while ((m = n) != NULL) {
2398 		n = m->m_nextpkt;
2399 		m_freem(m);
2400 	}
2401 	ifq->ifq_head = 0;
2402 	ifq->ifq_tail = 0;
2403 	ifq->ifq_len = 0;
2404 	IFQ_UNLOCK(ifq);
2405 }
2406 
2407 /*
2408  * Map interface name to interface structure pointer, with or without
2409  * returning a reference.
2410  */
2411 struct ifnet *
2412 ifunit_ref(const char *name)
2413 {
2414 	struct ifnet *ifp;
2415 
2416 	IFNET_RLOCK_NOSLEEP();
2417 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2418 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2419 		    !(ifp->if_flags & IFF_DYING))
2420 			break;
2421 	}
2422 	if (ifp != NULL)
2423 		if_ref(ifp);
2424 	IFNET_RUNLOCK_NOSLEEP();
2425 	return (ifp);
2426 }
2427 
2428 struct ifnet *
2429 ifunit(const char *name)
2430 {
2431 	struct ifnet *ifp;
2432 
2433 	IFNET_RLOCK_NOSLEEP();
2434 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2435 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2436 			break;
2437 	}
2438 	IFNET_RUNLOCK_NOSLEEP();
2439 	return (ifp);
2440 }
2441 
2442 static void *
2443 ifr_buffer_get_buffer(void *data)
2444 {
2445 	union ifreq_union *ifrup;
2446 
2447 	ifrup = data;
2448 #ifdef COMPAT_FREEBSD32
2449 	if (SV_CURPROC_FLAG(SV_ILP32))
2450 		return ((void *)(uintptr_t)
2451 		    ifrup->ifr32.ifr_ifru.ifru_buffer.buffer);
2452 #endif
2453 	return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer);
2454 }
2455 
2456 static void
2457 ifr_buffer_set_buffer_null(void *data)
2458 {
2459 	union ifreq_union *ifrup;
2460 
2461 	ifrup = data;
2462 #ifdef COMPAT_FREEBSD32
2463 	if (SV_CURPROC_FLAG(SV_ILP32))
2464 		ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0;
2465 	else
2466 #endif
2467 		ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL;
2468 }
2469 
2470 static size_t
2471 ifr_buffer_get_length(void *data)
2472 {
2473 	union ifreq_union *ifrup;
2474 
2475 	ifrup = data;
2476 #ifdef COMPAT_FREEBSD32
2477 	if (SV_CURPROC_FLAG(SV_ILP32))
2478 		return (ifrup->ifr32.ifr_ifru.ifru_buffer.length);
2479 #endif
2480 	return (ifrup->ifr.ifr_ifru.ifru_buffer.length);
2481 }
2482 
2483 static void
2484 ifr_buffer_set_length(void *data, size_t len)
2485 {
2486 	union ifreq_union *ifrup;
2487 
2488 	ifrup = data;
2489 #ifdef COMPAT_FREEBSD32
2490 	if (SV_CURPROC_FLAG(SV_ILP32))
2491 		ifrup->ifr32.ifr_ifru.ifru_buffer.length = len;
2492 	else
2493 #endif
2494 		ifrup->ifr.ifr_ifru.ifru_buffer.length = len;
2495 }
2496 
2497 void *
2498 ifr_data_get_ptr(void *ifrp)
2499 {
2500 	union ifreq_union *ifrup;
2501 
2502 	ifrup = ifrp;
2503 #ifdef COMPAT_FREEBSD32
2504 	if (SV_CURPROC_FLAG(SV_ILP32))
2505 		return ((void *)(uintptr_t)
2506 		    ifrup->ifr32.ifr_ifru.ifru_data);
2507 #endif
2508 		return (ifrup->ifr.ifr_ifru.ifru_data);
2509 }
2510 
2511 /*
2512  * Hardware specific interface ioctls.
2513  */
2514 static int
2515 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2516 {
2517 	struct ifreq *ifr;
2518 	int error = 0, do_ifup = 0;
2519 	int new_flags, temp_flags;
2520 	size_t namelen, onamelen;
2521 	size_t descrlen;
2522 	char *descrbuf, *odescrbuf;
2523 	char new_name[IFNAMSIZ];
2524 	struct ifaddr *ifa;
2525 	struct sockaddr_dl *sdl;
2526 
2527 	ifr = (struct ifreq *)data;
2528 	switch (cmd) {
2529 	case SIOCGIFINDEX:
2530 		ifr->ifr_index = ifp->if_index;
2531 		break;
2532 
2533 	case SIOCGIFFLAGS:
2534 		temp_flags = ifp->if_flags | ifp->if_drv_flags;
2535 		ifr->ifr_flags = temp_flags & 0xffff;
2536 		ifr->ifr_flagshigh = temp_flags >> 16;
2537 		break;
2538 
2539 	case SIOCGIFCAP:
2540 		ifr->ifr_reqcap = ifp->if_capabilities;
2541 		ifr->ifr_curcap = ifp->if_capenable;
2542 		break;
2543 
2544 #ifdef MAC
2545 	case SIOCGIFMAC:
2546 		error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2547 		break;
2548 #endif
2549 
2550 	case SIOCGIFMETRIC:
2551 		ifr->ifr_metric = ifp->if_metric;
2552 		break;
2553 
2554 	case SIOCGIFMTU:
2555 		ifr->ifr_mtu = ifp->if_mtu;
2556 		break;
2557 
2558 	case SIOCGIFPHYS:
2559 		/* XXXGL: did this ever worked? */
2560 		ifr->ifr_phys = 0;
2561 		break;
2562 
2563 	case SIOCGIFDESCR:
2564 		error = 0;
2565 		sx_slock(&ifdescr_sx);
2566 		if (ifp->if_description == NULL)
2567 			error = ENOMSG;
2568 		else {
2569 			/* space for terminating nul */
2570 			descrlen = strlen(ifp->if_description) + 1;
2571 			if (ifr_buffer_get_length(ifr) < descrlen)
2572 				ifr_buffer_set_buffer_null(ifr);
2573 			else
2574 				error = copyout(ifp->if_description,
2575 				    ifr_buffer_get_buffer(ifr), descrlen);
2576 			ifr_buffer_set_length(ifr, descrlen);
2577 		}
2578 		sx_sunlock(&ifdescr_sx);
2579 		break;
2580 
2581 	case SIOCSIFDESCR:
2582 		error = priv_check(td, PRIV_NET_SETIFDESCR);
2583 		if (error)
2584 			return (error);
2585 
2586 		/*
2587 		 * Copy only (length-1) bytes to make sure that
2588 		 * if_description is always nul terminated.  The
2589 		 * length parameter is supposed to count the
2590 		 * terminating nul in.
2591 		 */
2592 		if (ifr_buffer_get_length(ifr) > ifdescr_maxlen)
2593 			return (ENAMETOOLONG);
2594 		else if (ifr_buffer_get_length(ifr) == 0)
2595 			descrbuf = NULL;
2596 		else {
2597 			descrbuf = malloc(ifr_buffer_get_length(ifr),
2598 			    M_IFDESCR, M_WAITOK | M_ZERO);
2599 			error = copyin(ifr_buffer_get_buffer(ifr), descrbuf,
2600 			    ifr_buffer_get_length(ifr) - 1);
2601 			if (error) {
2602 				free(descrbuf, M_IFDESCR);
2603 				break;
2604 			}
2605 		}
2606 
2607 		sx_xlock(&ifdescr_sx);
2608 		odescrbuf = ifp->if_description;
2609 		ifp->if_description = descrbuf;
2610 		sx_xunlock(&ifdescr_sx);
2611 
2612 		getmicrotime(&ifp->if_lastchange);
2613 		free(odescrbuf, M_IFDESCR);
2614 		break;
2615 
2616 	case SIOCGIFFIB:
2617 		ifr->ifr_fib = ifp->if_fib;
2618 		break;
2619 
2620 	case SIOCSIFFIB:
2621 		error = priv_check(td, PRIV_NET_SETIFFIB);
2622 		if (error)
2623 			return (error);
2624 		if (ifr->ifr_fib >= rt_numfibs)
2625 			return (EINVAL);
2626 
2627 		ifp->if_fib = ifr->ifr_fib;
2628 		break;
2629 
2630 	case SIOCSIFFLAGS:
2631 		error = priv_check(td, PRIV_NET_SETIFFLAGS);
2632 		if (error)
2633 			return (error);
2634 		/*
2635 		 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2636 		 * check, so we don't need special handling here yet.
2637 		 */
2638 		new_flags = (ifr->ifr_flags & 0xffff) |
2639 		    (ifr->ifr_flagshigh << 16);
2640 		if (ifp->if_flags & IFF_UP &&
2641 		    (new_flags & IFF_UP) == 0) {
2642 			if_down(ifp);
2643 		} else if (new_flags & IFF_UP &&
2644 		    (ifp->if_flags & IFF_UP) == 0) {
2645 			do_ifup = 1;
2646 		}
2647 		/* See if permanently promiscuous mode bit is about to flip */
2648 		if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2649 			if (new_flags & IFF_PPROMISC)
2650 				ifp->if_flags |= IFF_PROMISC;
2651 			else if (ifp->if_pcount == 0)
2652 				ifp->if_flags &= ~IFF_PROMISC;
2653 			if (log_promisc_mode_change)
2654                                 if_printf(ifp, "permanently promiscuous mode %s\n",
2655                                     ((new_flags & IFF_PPROMISC) ?
2656                                      "enabled" : "disabled"));
2657 		}
2658 		ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2659 			(new_flags &~ IFF_CANTCHANGE);
2660 		if (ifp->if_ioctl) {
2661 			(void) (*ifp->if_ioctl)(ifp, cmd, data);
2662 		}
2663 		if (do_ifup)
2664 			if_up(ifp);
2665 		getmicrotime(&ifp->if_lastchange);
2666 		break;
2667 
2668 	case SIOCSIFCAP:
2669 		error = priv_check(td, PRIV_NET_SETIFCAP);
2670 		if (error)
2671 			return (error);
2672 		if (ifp->if_ioctl == NULL)
2673 			return (EOPNOTSUPP);
2674 		if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2675 			return (EINVAL);
2676 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2677 		if (error == 0)
2678 			getmicrotime(&ifp->if_lastchange);
2679 		break;
2680 
2681 #ifdef MAC
2682 	case SIOCSIFMAC:
2683 		error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2684 		break;
2685 #endif
2686 
2687 	case SIOCSIFNAME:
2688 		error = priv_check(td, PRIV_NET_SETIFNAME);
2689 		if (error)
2690 			return (error);
2691 		error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ,
2692 		    NULL);
2693 		if (error != 0)
2694 			return (error);
2695 		if (new_name[0] == '\0')
2696 			return (EINVAL);
2697 		if (new_name[IFNAMSIZ-1] != '\0') {
2698 			new_name[IFNAMSIZ-1] = '\0';
2699 			if (strlen(new_name) == IFNAMSIZ-1)
2700 				return (EINVAL);
2701 		}
2702 		if (ifunit(new_name) != NULL)
2703 			return (EEXIST);
2704 
2705 		/*
2706 		 * XXX: Locking.  Nothing else seems to lock if_flags,
2707 		 * and there are numerous other races with the
2708 		 * ifunit() checks not being atomic with namespace
2709 		 * changes (renames, vmoves, if_attach, etc).
2710 		 */
2711 		ifp->if_flags |= IFF_RENAMING;
2712 
2713 		/* Announce the departure of the interface. */
2714 		rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2715 		EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2716 
2717 		if_printf(ifp, "changing name to '%s'\n", new_name);
2718 
2719 		IF_ADDR_WLOCK(ifp);
2720 		strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2721 		ifa = ifp->if_addr;
2722 		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2723 		namelen = strlen(new_name);
2724 		onamelen = sdl->sdl_nlen;
2725 		/*
2726 		 * Move the address if needed.  This is safe because we
2727 		 * allocate space for a name of length IFNAMSIZ when we
2728 		 * create this in if_attach().
2729 		 */
2730 		if (namelen != onamelen) {
2731 			bcopy(sdl->sdl_data + onamelen,
2732 			    sdl->sdl_data + namelen, sdl->sdl_alen);
2733 		}
2734 		bcopy(new_name, sdl->sdl_data, namelen);
2735 		sdl->sdl_nlen = namelen;
2736 		sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2737 		bzero(sdl->sdl_data, onamelen);
2738 		while (namelen != 0)
2739 			sdl->sdl_data[--namelen] = 0xff;
2740 		IF_ADDR_WUNLOCK(ifp);
2741 
2742 		EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2743 		/* Announce the return of the interface. */
2744 		rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2745 
2746 		ifp->if_flags &= ~IFF_RENAMING;
2747 		break;
2748 
2749 #ifdef VIMAGE
2750 	case SIOCSIFVNET:
2751 		error = priv_check(td, PRIV_NET_SETIFVNET);
2752 		if (error)
2753 			return (error);
2754 		error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2755 		break;
2756 #endif
2757 
2758 	case SIOCSIFMETRIC:
2759 		error = priv_check(td, PRIV_NET_SETIFMETRIC);
2760 		if (error)
2761 			return (error);
2762 		ifp->if_metric = ifr->ifr_metric;
2763 		getmicrotime(&ifp->if_lastchange);
2764 		break;
2765 
2766 	case SIOCSIFPHYS:
2767 		error = priv_check(td, PRIV_NET_SETIFPHYS);
2768 		if (error)
2769 			return (error);
2770 		if (ifp->if_ioctl == NULL)
2771 			return (EOPNOTSUPP);
2772 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2773 		if (error == 0)
2774 			getmicrotime(&ifp->if_lastchange);
2775 		break;
2776 
2777 	case SIOCSIFMTU:
2778 	{
2779 		u_long oldmtu = ifp->if_mtu;
2780 
2781 		error = priv_check(td, PRIV_NET_SETIFMTU);
2782 		if (error)
2783 			return (error);
2784 		if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2785 			return (EINVAL);
2786 		if (ifp->if_ioctl == NULL)
2787 			return (EOPNOTSUPP);
2788 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2789 		if (error == 0) {
2790 			getmicrotime(&ifp->if_lastchange);
2791 			rt_ifmsg(ifp);
2792 #ifdef INET
2793 			NETDUMP_REINIT(ifp);
2794 #endif
2795 		}
2796 		/*
2797 		 * If the link MTU changed, do network layer specific procedure.
2798 		 */
2799 		if (ifp->if_mtu != oldmtu) {
2800 #ifdef INET6
2801 			nd6_setmtu(ifp);
2802 #endif
2803 			rt_updatemtu(ifp);
2804 		}
2805 		break;
2806 	}
2807 
2808 	case SIOCADDMULTI:
2809 	case SIOCDELMULTI:
2810 		if (cmd == SIOCADDMULTI)
2811 			error = priv_check(td, PRIV_NET_ADDMULTI);
2812 		else
2813 			error = priv_check(td, PRIV_NET_DELMULTI);
2814 		if (error)
2815 			return (error);
2816 
2817 		/* Don't allow group membership on non-multicast interfaces. */
2818 		if ((ifp->if_flags & IFF_MULTICAST) == 0)
2819 			return (EOPNOTSUPP);
2820 
2821 		/* Don't let users screw up protocols' entries. */
2822 		if (ifr->ifr_addr.sa_family != AF_LINK)
2823 			return (EINVAL);
2824 
2825 		if (cmd == SIOCADDMULTI) {
2826 			struct ifmultiaddr *ifma;
2827 
2828 			/*
2829 			 * Userland is only permitted to join groups once
2830 			 * via the if_addmulti() KPI, because it cannot hold
2831 			 * struct ifmultiaddr * between calls. It may also
2832 			 * lose a race while we check if the membership
2833 			 * already exists.
2834 			 */
2835 			IF_ADDR_RLOCK(ifp);
2836 			ifma = if_findmulti(ifp, &ifr->ifr_addr);
2837 			IF_ADDR_RUNLOCK(ifp);
2838 			if (ifma != NULL)
2839 				error = EADDRINUSE;
2840 			else
2841 				error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2842 		} else {
2843 			error = if_delmulti(ifp, &ifr->ifr_addr);
2844 		}
2845 		if (error == 0)
2846 			getmicrotime(&ifp->if_lastchange);
2847 		break;
2848 
2849 	case SIOCSIFPHYADDR:
2850 	case SIOCDIFPHYADDR:
2851 #ifdef INET6
2852 	case SIOCSIFPHYADDR_IN6:
2853 #endif
2854 	case SIOCSIFMEDIA:
2855 	case SIOCSIFGENERIC:
2856 		error = priv_check(td, PRIV_NET_HWIOCTL);
2857 		if (error)
2858 			return (error);
2859 		if (ifp->if_ioctl == NULL)
2860 			return (EOPNOTSUPP);
2861 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2862 		if (error == 0)
2863 			getmicrotime(&ifp->if_lastchange);
2864 		break;
2865 
2866 	case SIOCGIFSTATUS:
2867 	case SIOCGIFPSRCADDR:
2868 	case SIOCGIFPDSTADDR:
2869 	case SIOCGIFMEDIA:
2870 	case SIOCGIFXMEDIA:
2871 	case SIOCGIFGENERIC:
2872 	case SIOCGIFRSSKEY:
2873 	case SIOCGIFRSSHASH:
2874 		if (ifp->if_ioctl == NULL)
2875 			return (EOPNOTSUPP);
2876 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2877 		break;
2878 
2879 	case SIOCSIFLLADDR:
2880 		error = priv_check(td, PRIV_NET_SETLLADDR);
2881 		if (error)
2882 			return (error);
2883 		error = if_setlladdr(ifp,
2884 		    ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2885 		break;
2886 
2887 	case SIOCGHWADDR:
2888 		error = if_gethwaddr(ifp, ifr);
2889 		break;
2890 
2891 	CASE_IOC_IFGROUPREQ(SIOCAIFGROUP):
2892 		error = priv_check(td, PRIV_NET_ADDIFGROUP);
2893 		if (error)
2894 			return (error);
2895 		if ((error = if_addgroup(ifp,
2896 		    ifgr_group_get((struct ifgroupreq *)data))))
2897 			return (error);
2898 		break;
2899 
2900 	CASE_IOC_IFGROUPREQ(SIOCGIFGROUP):
2901 		if ((error = if_getgroup((struct ifgroupreq *)data, ifp)))
2902 			return (error);
2903 		break;
2904 
2905 	CASE_IOC_IFGROUPREQ(SIOCDIFGROUP):
2906 		error = priv_check(td, PRIV_NET_DELIFGROUP);
2907 		if (error)
2908 			return (error);
2909 		if ((error = if_delgroup(ifp,
2910 		    ifgr_group_get((struct ifgroupreq *)data))))
2911 			return (error);
2912 		break;
2913 
2914 	default:
2915 		error = ENOIOCTL;
2916 		break;
2917 	}
2918 	return (error);
2919 }
2920 
2921 #ifdef COMPAT_FREEBSD32
2922 struct ifconf32 {
2923 	int32_t	ifc_len;
2924 	union {
2925 		uint32_t	ifcu_buf;
2926 		uint32_t	ifcu_req;
2927 	} ifc_ifcu;
2928 };
2929 #define	SIOCGIFCONF32	_IOWR('i', 36, struct ifconf32)
2930 #endif
2931 
2932 #ifdef COMPAT_FREEBSD32
2933 static void
2934 ifmr_init(struct ifmediareq *ifmr, caddr_t data)
2935 {
2936 	struct ifmediareq32 *ifmr32;
2937 
2938 	ifmr32 = (struct ifmediareq32 *)data;
2939 	memcpy(ifmr->ifm_name, ifmr32->ifm_name,
2940 	    sizeof(ifmr->ifm_name));
2941 	ifmr->ifm_current = ifmr32->ifm_current;
2942 	ifmr->ifm_mask = ifmr32->ifm_mask;
2943 	ifmr->ifm_status = ifmr32->ifm_status;
2944 	ifmr->ifm_active = ifmr32->ifm_active;
2945 	ifmr->ifm_count = ifmr32->ifm_count;
2946 	ifmr->ifm_ulist = (int *)(uintptr_t)ifmr32->ifm_ulist;
2947 }
2948 
2949 static void
2950 ifmr_update(const struct ifmediareq *ifmr, caddr_t data)
2951 {
2952 	struct ifmediareq32 *ifmr32;
2953 
2954 	ifmr32 = (struct ifmediareq32 *)data;
2955 	ifmr32->ifm_current = ifmr->ifm_current;
2956 	ifmr32->ifm_mask = ifmr->ifm_mask;
2957 	ifmr32->ifm_status = ifmr->ifm_status;
2958 	ifmr32->ifm_active = ifmr->ifm_active;
2959 	ifmr32->ifm_count = ifmr->ifm_count;
2960 }
2961 #endif
2962 
2963 /*
2964  * Interface ioctls.
2965  */
2966 int
2967 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2968 {
2969 #ifdef COMPAT_FREEBSD32
2970 	caddr_t saved_data = NULL;
2971 	struct ifmediareq ifmr;
2972 	struct ifmediareq *ifmrp;
2973 #endif
2974 	struct ifnet *ifp;
2975 	struct ifreq *ifr;
2976 	int error;
2977 	int oif_flags;
2978 #ifdef VIMAGE
2979 	int shutdown;
2980 #endif
2981 
2982 	CURVNET_SET(so->so_vnet);
2983 #ifdef VIMAGE
2984 	/* Make sure the VNET is stable. */
2985 	shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET &&
2986 		 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
2987 	if (shutdown) {
2988 		CURVNET_RESTORE();
2989 		return (EBUSY);
2990 	}
2991 #endif
2992 
2993 
2994 	switch (cmd) {
2995 	case SIOCGIFCONF:
2996 		error = ifconf(cmd, data);
2997 		CURVNET_RESTORE();
2998 		return (error);
2999 
3000 #ifdef COMPAT_FREEBSD32
3001 	case SIOCGIFCONF32:
3002 		{
3003 			struct ifconf32 *ifc32;
3004 			struct ifconf ifc;
3005 
3006 			ifc32 = (struct ifconf32 *)data;
3007 			ifc.ifc_len = ifc32->ifc_len;
3008 			ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
3009 
3010 			error = ifconf(SIOCGIFCONF, (void *)&ifc);
3011 			CURVNET_RESTORE();
3012 			if (error == 0)
3013 				ifc32->ifc_len = ifc.ifc_len;
3014 			return (error);
3015 		}
3016 #endif
3017 	}
3018 
3019 #ifdef COMPAT_FREEBSD32
3020 	ifmrp = NULL;
3021 	switch (cmd) {
3022 	case SIOCGIFMEDIA32:
3023 	case SIOCGIFXMEDIA32:
3024 		ifmrp = &ifmr;
3025 		ifmr_init(ifmrp, data);
3026 		cmd = _IOC_NEWTYPE(cmd, struct ifmediareq);
3027 		saved_data = data;
3028 		data = (caddr_t)ifmrp;
3029 	}
3030 #endif
3031 
3032 	ifr = (struct ifreq *)data;
3033 	switch (cmd) {
3034 #ifdef VIMAGE
3035 	case SIOCSIFRVNET:
3036 		error = priv_check(td, PRIV_NET_SETIFVNET);
3037 		if (error == 0)
3038 			error = if_vmove_reclaim(td, ifr->ifr_name,
3039 			    ifr->ifr_jid);
3040 		goto out_noref;
3041 #endif
3042 	case SIOCIFCREATE:
3043 	case SIOCIFCREATE2:
3044 		error = priv_check(td, PRIV_NET_IFCREATE);
3045 		if (error == 0)
3046 			error = if_clone_create(ifr->ifr_name,
3047 			    sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ?
3048 			    ifr_data_get_ptr(ifr) : NULL);
3049 		goto out_noref;
3050 	case SIOCIFDESTROY:
3051 		error = priv_check(td, PRIV_NET_IFDESTROY);
3052 		if (error == 0)
3053 			error = if_clone_destroy(ifr->ifr_name);
3054 		goto out_noref;
3055 
3056 	case SIOCIFGCLONERS:
3057 		error = if_clone_list((struct if_clonereq *)data);
3058 		goto out_noref;
3059 
3060 	CASE_IOC_IFGROUPREQ(SIOCGIFGMEMB):
3061 		error = if_getgroupmembers((struct ifgroupreq *)data);
3062 		goto out_noref;
3063 
3064 #if defined(INET) || defined(INET6)
3065 	case SIOCSVH:
3066 	case SIOCGVH:
3067 		if (carp_ioctl_p == NULL)
3068 			error = EPROTONOSUPPORT;
3069 		else
3070 			error = (*carp_ioctl_p)(ifr, cmd, td);
3071 		goto out_noref;
3072 #endif
3073 	}
3074 
3075 	ifp = ifunit_ref(ifr->ifr_name);
3076 	if (ifp == NULL) {
3077 		error = ENXIO;
3078 		goto out_noref;
3079 	}
3080 
3081 	error = ifhwioctl(cmd, ifp, data, td);
3082 	if (error != ENOIOCTL)
3083 		goto out_ref;
3084 
3085 	oif_flags = ifp->if_flags;
3086 	if (so->so_proto == NULL) {
3087 		error = EOPNOTSUPP;
3088 		goto out_ref;
3089 	}
3090 
3091 	/*
3092 	 * Pass the request on to the socket control method, and if the
3093 	 * latter returns EOPNOTSUPP, directly to the interface.
3094 	 *
3095 	 * Make an exception for the legacy SIOCSIF* requests.  Drivers
3096 	 * trust SIOCSIFADDR et al to come from an already privileged
3097 	 * layer, and do not perform any credentials checks or input
3098 	 * validation.
3099 	 */
3100 	error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data,
3101 	    ifp, td));
3102 	if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
3103 	    cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
3104 	    cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
3105 		error = (*ifp->if_ioctl)(ifp, cmd, data);
3106 
3107 	if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
3108 #ifdef INET6
3109 		if (ifp->if_flags & IFF_UP)
3110 			in6_if_up(ifp);
3111 #endif
3112 	}
3113 
3114 out_ref:
3115 	if_rele(ifp);
3116 out_noref:
3117 #ifdef COMPAT_FREEBSD32
3118 	if (ifmrp != NULL) {
3119 		KASSERT((cmd == SIOCGIFMEDIA || cmd == SIOCGIFXMEDIA),
3120 		    ("ifmrp non-NULL, but cmd is not an ifmedia req 0x%lx",
3121 		     cmd));
3122 		data = saved_data;
3123 		ifmr_update(ifmrp, data);
3124 	}
3125 #endif
3126 	CURVNET_RESTORE();
3127 	return (error);
3128 }
3129 
3130 /*
3131  * The code common to handling reference counted flags,
3132  * e.g., in ifpromisc() and if_allmulti().
3133  * The "pflag" argument can specify a permanent mode flag to check,
3134  * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
3135  *
3136  * Only to be used on stack-owned flags, not driver-owned flags.
3137  */
3138 static int
3139 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
3140 {
3141 	struct ifreq ifr;
3142 	int error;
3143 	int oldflags, oldcount;
3144 
3145 	/* Sanity checks to catch programming errors */
3146 	KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
3147 	    ("%s: setting driver-owned flag %d", __func__, flag));
3148 
3149 	if (onswitch)
3150 		KASSERT(*refcount >= 0,
3151 		    ("%s: increment negative refcount %d for flag %d",
3152 		    __func__, *refcount, flag));
3153 	else
3154 		KASSERT(*refcount > 0,
3155 		    ("%s: decrement non-positive refcount %d for flag %d",
3156 		    __func__, *refcount, flag));
3157 
3158 	/* In case this mode is permanent, just touch refcount */
3159 	if (ifp->if_flags & pflag) {
3160 		*refcount += onswitch ? 1 : -1;
3161 		return (0);
3162 	}
3163 
3164 	/* Save ifnet parameters for if_ioctl() may fail */
3165 	oldcount = *refcount;
3166 	oldflags = ifp->if_flags;
3167 
3168 	/*
3169 	 * See if we aren't the only and touching refcount is enough.
3170 	 * Actually toggle interface flag if we are the first or last.
3171 	 */
3172 	if (onswitch) {
3173 		if ((*refcount)++)
3174 			return (0);
3175 		ifp->if_flags |= flag;
3176 	} else {
3177 		if (--(*refcount))
3178 			return (0);
3179 		ifp->if_flags &= ~flag;
3180 	}
3181 
3182 	/* Call down the driver since we've changed interface flags */
3183 	if (ifp->if_ioctl == NULL) {
3184 		error = EOPNOTSUPP;
3185 		goto recover;
3186 	}
3187 	ifr.ifr_flags = ifp->if_flags & 0xffff;
3188 	ifr.ifr_flagshigh = ifp->if_flags >> 16;
3189 	error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3190 	if (error)
3191 		goto recover;
3192 	/* Notify userland that interface flags have changed */
3193 	rt_ifmsg(ifp);
3194 	return (0);
3195 
3196 recover:
3197 	/* Recover after driver error */
3198 	*refcount = oldcount;
3199 	ifp->if_flags = oldflags;
3200 	return (error);
3201 }
3202 
3203 /*
3204  * Set/clear promiscuous mode on interface ifp based on the truth value
3205  * of pswitch.  The calls are reference counted so that only the first
3206  * "on" request actually has an effect, as does the final "off" request.
3207  * Results are undefined if the "off" and "on" requests are not matched.
3208  */
3209 int
3210 ifpromisc(struct ifnet *ifp, int pswitch)
3211 {
3212 	int error;
3213 	int oldflags = ifp->if_flags;
3214 
3215 	error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
3216 			   &ifp->if_pcount, pswitch);
3217 	/* If promiscuous mode status has changed, log a message */
3218 	if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) &&
3219             log_promisc_mode_change)
3220 		if_printf(ifp, "promiscuous mode %s\n",
3221 		    (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
3222 	return (error);
3223 }
3224 
3225 /*
3226  * Return interface configuration
3227  * of system.  List may be used
3228  * in later ioctl's (above) to get
3229  * other information.
3230  */
3231 /*ARGSUSED*/
3232 static int
3233 ifconf(u_long cmd, caddr_t data)
3234 {
3235 	struct ifconf *ifc = (struct ifconf *)data;
3236 	struct ifnet *ifp;
3237 	struct ifaddr *ifa;
3238 	struct ifreq ifr;
3239 	struct sbuf *sb;
3240 	int error, full = 0, valid_len, max_len;
3241 
3242 	/* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */
3243 	max_len = MAXPHYS - 1;
3244 
3245 	/* Prevent hostile input from being able to crash the system */
3246 	if (ifc->ifc_len <= 0)
3247 		return (EINVAL);
3248 
3249 again:
3250 	if (ifc->ifc_len <= max_len) {
3251 		max_len = ifc->ifc_len;
3252 		full = 1;
3253 	}
3254 	sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
3255 	max_len = 0;
3256 	valid_len = 0;
3257 
3258 	IFNET_RLOCK();
3259 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
3260 		int addrs;
3261 
3262 		/*
3263 		 * Zero the ifr to make sure we don't disclose the contents
3264 		 * of the stack.
3265 		 */
3266 		memset(&ifr, 0, sizeof(ifr));
3267 
3268 		if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
3269 		    >= sizeof(ifr.ifr_name)) {
3270 			sbuf_delete(sb);
3271 			IFNET_RUNLOCK();
3272 			return (ENAMETOOLONG);
3273 		}
3274 
3275 		addrs = 0;
3276 		IF_ADDR_RLOCK(ifp);
3277 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3278 			struct sockaddr *sa = ifa->ifa_addr;
3279 
3280 			if (prison_if(curthread->td_ucred, sa) != 0)
3281 				continue;
3282 			addrs++;
3283 			if (sa->sa_len <= sizeof(*sa)) {
3284 				if (sa->sa_len < sizeof(*sa)) {
3285 					memset(&ifr.ifr_ifru.ifru_addr, 0,
3286 					    sizeof(ifr.ifr_ifru.ifru_addr));
3287 					memcpy(&ifr.ifr_ifru.ifru_addr, sa,
3288 					    sa->sa_len);
3289 				} else
3290 					ifr.ifr_ifru.ifru_addr = *sa;
3291 				sbuf_bcat(sb, &ifr, sizeof(ifr));
3292 				max_len += sizeof(ifr);
3293 			} else {
3294 				sbuf_bcat(sb, &ifr,
3295 				    offsetof(struct ifreq, ifr_addr));
3296 				max_len += offsetof(struct ifreq, ifr_addr);
3297 				sbuf_bcat(sb, sa, sa->sa_len);
3298 				max_len += sa->sa_len;
3299 			}
3300 
3301 			if (sbuf_error(sb) == 0)
3302 				valid_len = sbuf_len(sb);
3303 		}
3304 		IF_ADDR_RUNLOCK(ifp);
3305 		if (addrs == 0) {
3306 			sbuf_bcat(sb, &ifr, sizeof(ifr));
3307 			max_len += sizeof(ifr);
3308 
3309 			if (sbuf_error(sb) == 0)
3310 				valid_len = sbuf_len(sb);
3311 		}
3312 	}
3313 	IFNET_RUNLOCK();
3314 
3315 	/*
3316 	 * If we didn't allocate enough space (uncommon), try again.  If
3317 	 * we have already allocated as much space as we are allowed,
3318 	 * return what we've got.
3319 	 */
3320 	if (valid_len != max_len && !full) {
3321 		sbuf_delete(sb);
3322 		goto again;
3323 	}
3324 
3325 	ifc->ifc_len = valid_len;
3326 	sbuf_finish(sb);
3327 	error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
3328 	sbuf_delete(sb);
3329 	return (error);
3330 }
3331 
3332 /*
3333  * Just like ifpromisc(), but for all-multicast-reception mode.
3334  */
3335 int
3336 if_allmulti(struct ifnet *ifp, int onswitch)
3337 {
3338 
3339 	return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
3340 }
3341 
3342 struct ifmultiaddr *
3343 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa)
3344 {
3345 	struct ifmultiaddr *ifma;
3346 
3347 	IF_ADDR_LOCK_ASSERT(ifp);
3348 
3349 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
3350 		if (sa->sa_family == AF_LINK) {
3351 			if (sa_dl_equal(ifma->ifma_addr, sa))
3352 				break;
3353 		} else {
3354 			if (sa_equal(ifma->ifma_addr, sa))
3355 				break;
3356 		}
3357 	}
3358 
3359 	return ifma;
3360 }
3361 
3362 /*
3363  * Allocate a new ifmultiaddr and initialize based on passed arguments.  We
3364  * make copies of passed sockaddrs.  The ifmultiaddr will not be added to
3365  * the ifnet multicast address list here, so the caller must do that and
3366  * other setup work (such as notifying the device driver).  The reference
3367  * count is initialized to 1.
3368  */
3369 static struct ifmultiaddr *
3370 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
3371     int mflags)
3372 {
3373 	struct ifmultiaddr *ifma;
3374 	struct sockaddr *dupsa;
3375 
3376 	ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
3377 	    M_ZERO);
3378 	if (ifma == NULL)
3379 		return (NULL);
3380 
3381 	dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
3382 	if (dupsa == NULL) {
3383 		free(ifma, M_IFMADDR);
3384 		return (NULL);
3385 	}
3386 	bcopy(sa, dupsa, sa->sa_len);
3387 	ifma->ifma_addr = dupsa;
3388 
3389 	ifma->ifma_ifp = ifp;
3390 	ifma->ifma_refcount = 1;
3391 	ifma->ifma_protospec = NULL;
3392 
3393 	if (llsa == NULL) {
3394 		ifma->ifma_lladdr = NULL;
3395 		return (ifma);
3396 	}
3397 
3398 	dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
3399 	if (dupsa == NULL) {
3400 		free(ifma->ifma_addr, M_IFMADDR);
3401 		free(ifma, M_IFMADDR);
3402 		return (NULL);
3403 	}
3404 	bcopy(llsa, dupsa, llsa->sa_len);
3405 	ifma->ifma_lladdr = dupsa;
3406 
3407 	return (ifma);
3408 }
3409 
3410 /*
3411  * if_freemulti: free ifmultiaddr structure and possibly attached related
3412  * addresses.  The caller is responsible for implementing reference
3413  * counting, notifying the driver, handling routing messages, and releasing
3414  * any dependent link layer state.
3415  */
3416 #ifdef MCAST_VERBOSE
3417 extern void kdb_backtrace(void);
3418 #endif
3419 static void
3420 if_freemulti_internal(struct ifmultiaddr *ifma)
3421 {
3422 
3423 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
3424 	    ifma->ifma_refcount));
3425 
3426 	if (ifma->ifma_lladdr != NULL)
3427 		free(ifma->ifma_lladdr, M_IFMADDR);
3428 #ifdef MCAST_VERBOSE
3429 	kdb_backtrace();
3430 	printf("%s freeing ifma: %p\n", __func__, ifma);
3431 #endif
3432 	free(ifma->ifma_addr, M_IFMADDR);
3433 	free(ifma, M_IFMADDR);
3434 }
3435 
3436 static void
3437 if_destroymulti(epoch_context_t ctx)
3438 {
3439 	struct ifmultiaddr *ifma;
3440 
3441 	ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx);
3442 	if_freemulti_internal(ifma);
3443 }
3444 
3445 void
3446 if_freemulti(struct ifmultiaddr *ifma)
3447 {
3448 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d",
3449 	    ifma->ifma_refcount));
3450 
3451 	epoch_call(net_epoch_preempt, &ifma->ifma_epoch_ctx, if_destroymulti);
3452 }
3453 
3454 
3455 /*
3456  * Register an additional multicast address with a network interface.
3457  *
3458  * - If the address is already present, bump the reference count on the
3459  *   address and return.
3460  * - If the address is not link-layer, look up a link layer address.
3461  * - Allocate address structures for one or both addresses, and attach to the
3462  *   multicast address list on the interface.  If automatically adding a link
3463  *   layer address, the protocol address will own a reference to the link
3464  *   layer address, to be freed when it is freed.
3465  * - Notify the network device driver of an addition to the multicast address
3466  *   list.
3467  *
3468  * 'sa' points to caller-owned memory with the desired multicast address.
3469  *
3470  * 'retifma' will be used to return a pointer to the resulting multicast
3471  * address reference, if desired.
3472  */
3473 int
3474 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
3475     struct ifmultiaddr **retifma)
3476 {
3477 	struct ifmultiaddr *ifma, *ll_ifma;
3478 	struct sockaddr *llsa;
3479 	struct sockaddr_dl sdl;
3480 	int error;
3481 
3482 #ifdef INET
3483 	IN_MULTI_LIST_UNLOCK_ASSERT();
3484 #endif
3485 #ifdef INET6
3486 	IN6_MULTI_LIST_UNLOCK_ASSERT();
3487 #endif
3488 	/*
3489 	 * If the address is already present, return a new reference to it;
3490 	 * otherwise, allocate storage and set up a new address.
3491 	 */
3492 	IF_ADDR_WLOCK(ifp);
3493 	ifma = if_findmulti(ifp, sa);
3494 	if (ifma != NULL) {
3495 		ifma->ifma_refcount++;
3496 		if (retifma != NULL)
3497 			*retifma = ifma;
3498 		IF_ADDR_WUNLOCK(ifp);
3499 		return (0);
3500 	}
3501 
3502 	/*
3503 	 * The address isn't already present; resolve the protocol address
3504 	 * into a link layer address, and then look that up, bump its
3505 	 * refcount or allocate an ifma for that also.
3506 	 * Most link layer resolving functions returns address data which
3507 	 * fits inside default sockaddr_dl structure. However callback
3508 	 * can allocate another sockaddr structure, in that case we need to
3509 	 * free it later.
3510 	 */
3511 	llsa = NULL;
3512 	ll_ifma = NULL;
3513 	if (ifp->if_resolvemulti != NULL) {
3514 		/* Provide called function with buffer size information */
3515 		sdl.sdl_len = sizeof(sdl);
3516 		llsa = (struct sockaddr *)&sdl;
3517 		error = ifp->if_resolvemulti(ifp, &llsa, sa);
3518 		if (error)
3519 			goto unlock_out;
3520 	}
3521 
3522 	/*
3523 	 * Allocate the new address.  Don't hook it up yet, as we may also
3524 	 * need to allocate a link layer multicast address.
3525 	 */
3526 	ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3527 	if (ifma == NULL) {
3528 		error = ENOMEM;
3529 		goto free_llsa_out;
3530 	}
3531 
3532 	/*
3533 	 * If a link layer address is found, we'll need to see if it's
3534 	 * already present in the address list, or allocate is as well.
3535 	 * When this block finishes, the link layer address will be on the
3536 	 * list.
3537 	 */
3538 	if (llsa != NULL) {
3539 		ll_ifma = if_findmulti(ifp, llsa);
3540 		if (ll_ifma == NULL) {
3541 			ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3542 			if (ll_ifma == NULL) {
3543 				--ifma->ifma_refcount;
3544 				if_freemulti(ifma);
3545 				error = ENOMEM;
3546 				goto free_llsa_out;
3547 			}
3548 			CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3549 			    ifma_link);
3550 		} else
3551 			ll_ifma->ifma_refcount++;
3552 		ifma->ifma_llifma = ll_ifma;
3553 	}
3554 
3555 	/*
3556 	 * We now have a new multicast address, ifma, and possibly a new or
3557 	 * referenced link layer address.  Add the primary address to the
3558 	 * ifnet address list.
3559 	 */
3560 	CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3561 
3562 	if (retifma != NULL)
3563 		*retifma = ifma;
3564 
3565 	/*
3566 	 * Must generate the message while holding the lock so that 'ifma'
3567 	 * pointer is still valid.
3568 	 */
3569 	rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3570 	IF_ADDR_WUNLOCK(ifp);
3571 
3572 	/*
3573 	 * We are certain we have added something, so call down to the
3574 	 * interface to let them know about it.
3575 	 */
3576 	if (ifp->if_ioctl != NULL) {
3577 		(void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3578 	}
3579 
3580 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3581 		link_free_sdl(llsa);
3582 
3583 	return (0);
3584 
3585 free_llsa_out:
3586 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3587 		link_free_sdl(llsa);
3588 
3589 unlock_out:
3590 	IF_ADDR_WUNLOCK(ifp);
3591 	return (error);
3592 }
3593 
3594 /*
3595  * Delete a multicast group membership by network-layer group address.
3596  *
3597  * Returns ENOENT if the entry could not be found. If ifp no longer
3598  * exists, results are undefined. This entry point should only be used
3599  * from subsystems which do appropriate locking to hold ifp for the
3600  * duration of the call.
3601  * Network-layer protocol domains must use if_delmulti_ifma().
3602  */
3603 int
3604 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3605 {
3606 	struct ifmultiaddr *ifma;
3607 	int lastref;
3608 #ifdef INVARIANTS
3609 	struct ifnet *oifp;
3610 
3611 	IFNET_RLOCK_NOSLEEP();
3612 	CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link)
3613 		if (ifp == oifp)
3614 			break;
3615 	if (ifp != oifp)
3616 		ifp = NULL;
3617 	IFNET_RUNLOCK_NOSLEEP();
3618 
3619 	KASSERT(ifp != NULL, ("%s: ifnet went away", __func__));
3620 #endif
3621 	if (ifp == NULL)
3622 		return (ENOENT);
3623 
3624 	IF_ADDR_WLOCK(ifp);
3625 	lastref = 0;
3626 	ifma = if_findmulti(ifp, sa);
3627 	if (ifma != NULL)
3628 		lastref = if_delmulti_locked(ifp, ifma, 0);
3629 	IF_ADDR_WUNLOCK(ifp);
3630 
3631 	if (ifma == NULL)
3632 		return (ENOENT);
3633 
3634 	if (lastref && ifp->if_ioctl != NULL) {
3635 		(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3636 	}
3637 
3638 	return (0);
3639 }
3640 
3641 /*
3642  * Delete all multicast group membership for an interface.
3643  * Should be used to quickly flush all multicast filters.
3644  */
3645 void
3646 if_delallmulti(struct ifnet *ifp)
3647 {
3648 	struct ifmultiaddr *ifma;
3649 	struct ifmultiaddr *next;
3650 
3651 	IF_ADDR_WLOCK(ifp);
3652 	CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3653 		if_delmulti_locked(ifp, ifma, 0);
3654 	IF_ADDR_WUNLOCK(ifp);
3655 }
3656 
3657 void
3658 if_delmulti_ifma(struct ifmultiaddr *ifma)
3659 {
3660 	if_delmulti_ifma_flags(ifma, 0);
3661 }
3662 
3663 /*
3664  * Delete a multicast group membership by group membership pointer.
3665  * Network-layer protocol domains must use this routine.
3666  *
3667  * It is safe to call this routine if the ifp disappeared.
3668  */
3669 void
3670 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags)
3671 {
3672 	struct ifnet *ifp;
3673 	int lastref;
3674 	MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma);
3675 #ifdef INET
3676 	IN_MULTI_LIST_UNLOCK_ASSERT();
3677 #endif
3678 	ifp = ifma->ifma_ifp;
3679 #ifdef DIAGNOSTIC
3680 	if (ifp == NULL) {
3681 		printf("%s: ifma_ifp seems to be detached\n", __func__);
3682 	} else {
3683 		struct ifnet *oifp;
3684 
3685 		IFNET_RLOCK_NOSLEEP();
3686 		CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link)
3687 			if (ifp == oifp)
3688 				break;
3689 		if (ifp != oifp)
3690 			ifp = NULL;
3691 		IFNET_RUNLOCK_NOSLEEP();
3692 	}
3693 #endif
3694 	/*
3695 	 * If and only if the ifnet instance exists: Acquire the address lock.
3696 	 */
3697 	if (ifp != NULL)
3698 		IF_ADDR_WLOCK(ifp);
3699 
3700 	lastref = if_delmulti_locked(ifp, ifma, flags);
3701 
3702 	if (ifp != NULL) {
3703 		/*
3704 		 * If and only if the ifnet instance exists:
3705 		 *  Release the address lock.
3706 		 *  If the group was left: update the hardware hash filter.
3707 		 */
3708 		IF_ADDR_WUNLOCK(ifp);
3709 		if (lastref && ifp->if_ioctl != NULL) {
3710 			(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3711 		}
3712 	}
3713 }
3714 
3715 /*
3716  * Perform deletion of network-layer and/or link-layer multicast address.
3717  *
3718  * Return 0 if the reference count was decremented.
3719  * Return 1 if the final reference was released, indicating that the
3720  * hardware hash filter should be reprogrammed.
3721  */
3722 static int
3723 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3724 {
3725 	struct ifmultiaddr *ll_ifma;
3726 
3727 	if (ifp != NULL && ifma->ifma_ifp != NULL) {
3728 		KASSERT(ifma->ifma_ifp == ifp,
3729 		    ("%s: inconsistent ifp %p", __func__, ifp));
3730 		IF_ADDR_WLOCK_ASSERT(ifp);
3731 	}
3732 
3733 	ifp = ifma->ifma_ifp;
3734 	MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : "");
3735 
3736 	/*
3737 	 * If the ifnet is detaching, null out references to ifnet,
3738 	 * so that upper protocol layers will notice, and not attempt
3739 	 * to obtain locks for an ifnet which no longer exists. The
3740 	 * routing socket announcement must happen before the ifnet
3741 	 * instance is detached from the system.
3742 	 */
3743 	if (detaching) {
3744 #ifdef DIAGNOSTIC
3745 		printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3746 #endif
3747 		/*
3748 		 * ifp may already be nulled out if we are being reentered
3749 		 * to delete the ll_ifma.
3750 		 */
3751 		if (ifp != NULL) {
3752 			rt_newmaddrmsg(RTM_DELMADDR, ifma);
3753 			ifma->ifma_ifp = NULL;
3754 		}
3755 	}
3756 
3757 	if (--ifma->ifma_refcount > 0)
3758 		return 0;
3759 
3760 	if (ifp != NULL && detaching == 0)
3761 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
3762 
3763 	/*
3764 	 * If this ifma is a network-layer ifma, a link-layer ifma may
3765 	 * have been associated with it. Release it first if so.
3766 	 */
3767 	ll_ifma = ifma->ifma_llifma;
3768 	if (ll_ifma != NULL) {
3769 		KASSERT(ifma->ifma_lladdr != NULL,
3770 		    ("%s: llifma w/o lladdr", __func__));
3771 		if (detaching)
3772 			ll_ifma->ifma_ifp = NULL;	/* XXX */
3773 		if (--ll_ifma->ifma_refcount == 0) {
3774 			if (ifp != NULL) {
3775 				CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr,
3776 				    ifma_link);
3777 			}
3778 			if_freemulti(ll_ifma);
3779 		}
3780 	}
3781 #ifdef INVARIANTS
3782 	if (ifp) {
3783 		struct ifmultiaddr *ifmatmp;
3784 
3785 		CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link)
3786 			MPASS(ifma != ifmatmp);
3787 	}
3788 #endif
3789 	if_freemulti(ifma);
3790 	/*
3791 	 * The last reference to this instance of struct ifmultiaddr
3792 	 * was released; the hardware should be notified of this change.
3793 	 */
3794 	return 1;
3795 }
3796 
3797 /*
3798  * Set the link layer address on an interface.
3799  *
3800  * At this time we only support certain types of interfaces,
3801  * and we don't allow the length of the address to change.
3802  *
3803  * Set noinline to be dtrace-friendly
3804  */
3805 __noinline int
3806 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3807 {
3808 	struct sockaddr_dl *sdl;
3809 	struct ifaddr *ifa;
3810 	struct ifreq ifr;
3811 	int rc;
3812 
3813 	rc = 0;
3814 	NET_EPOCH_ENTER();
3815 	ifa = ifp->if_addr;
3816 	if (ifa == NULL) {
3817 		rc = EINVAL;
3818 		goto out;
3819 	}
3820 
3821 	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3822 	if (sdl == NULL) {
3823 		rc = EINVAL;
3824 		goto out;
3825 	}
3826 	if (len != sdl->sdl_alen) {	/* don't allow length to change */
3827 		rc = EINVAL;
3828 		goto out;
3829 	}
3830 	switch (ifp->if_type) {
3831 	case IFT_ETHER:
3832 	case IFT_XETHER:
3833 	case IFT_L2VLAN:
3834 	case IFT_BRIDGE:
3835 	case IFT_IEEE8023ADLAG:
3836 		bcopy(lladdr, LLADDR(sdl), len);
3837 		break;
3838 	default:
3839 		rc = ENODEV;
3840 		goto out;
3841 	}
3842 
3843 	/*
3844 	 * If the interface is already up, we need
3845 	 * to re-init it in order to reprogram its
3846 	 * address filter.
3847 	 */
3848 	NET_EPOCH_EXIT();
3849 	if ((ifp->if_flags & IFF_UP) != 0) {
3850 		if (ifp->if_ioctl) {
3851 			ifp->if_flags &= ~IFF_UP;
3852 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3853 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3854 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3855 			ifp->if_flags |= IFF_UP;
3856 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3857 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3858 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3859 		}
3860 	}
3861 	EVENTHANDLER_INVOKE(iflladdr_event, ifp);
3862 	return (0);
3863  out:
3864 	NET_EPOCH_EXIT();
3865 	return (rc);
3866 }
3867 
3868 /*
3869  * Compat function for handling basic encapsulation requests.
3870  * Not converted stacks (FDDI, IB, ..) supports traditional
3871  * output model: ARP (and other similar L2 protocols) are handled
3872  * inside output routine, arpresolve/nd6_resolve() returns MAC
3873  * address instead of full prepend.
3874  *
3875  * This function creates calculated header==MAC for IPv4/IPv6 and
3876  * returns EAFNOSUPPORT (which is then handled in ARP code) for other
3877  * address families.
3878  */
3879 static int
3880 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req)
3881 {
3882 
3883 	if (req->rtype != IFENCAP_LL)
3884 		return (EOPNOTSUPP);
3885 
3886 	if (req->bufsize < req->lladdr_len)
3887 		return (ENOMEM);
3888 
3889 	switch (req->family) {
3890 	case AF_INET:
3891 	case AF_INET6:
3892 		break;
3893 	default:
3894 		return (EAFNOSUPPORT);
3895 	}
3896 
3897 	/* Copy lladdr to storage as is */
3898 	memmove(req->buf, req->lladdr, req->lladdr_len);
3899 	req->bufsize = req->lladdr_len;
3900 	req->lladdr_off = 0;
3901 
3902 	return (0);
3903 }
3904 
3905 /*
3906  * Tunnel interfaces can nest, also they may cause infinite recursion
3907  * calls when misconfigured. We'll prevent this by detecting loops.
3908  * High nesting level may cause stack exhaustion. We'll prevent this
3909  * by introducing upper limit.
3910  *
3911  * Return 0, if tunnel nesting count is equal or less than limit.
3912  */
3913 int
3914 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie,
3915     int limit)
3916 {
3917 	struct m_tag *mtag;
3918 	int count;
3919 
3920 	count = 1;
3921 	mtag = NULL;
3922 	while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) {
3923 		if (*(struct ifnet **)(mtag + 1) == ifp) {
3924 			log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp));
3925 			return (EIO);
3926 		}
3927 		count++;
3928 	}
3929 	if (count > limit) {
3930 		log(LOG_NOTICE,
3931 		    "%s: if_output recursively called too many times(%d)\n",
3932 		    if_name(ifp), count);
3933 		return (EIO);
3934 	}
3935 	mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT);
3936 	if (mtag == NULL)
3937 		return (ENOMEM);
3938 	*(struct ifnet **)(mtag + 1) = ifp;
3939 	m_tag_prepend(m, mtag);
3940 	return (0);
3941 }
3942 
3943 /*
3944  * Get the link layer address that was read from the hardware at attach.
3945  *
3946  * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type
3947  * their component interfaces as IFT_IEEE8023ADLAG.
3948  */
3949 int
3950 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr)
3951 {
3952 
3953 	if (ifp->if_hw_addr == NULL)
3954 		return (ENODEV);
3955 
3956 	switch (ifp->if_type) {
3957 	case IFT_ETHER:
3958 	case IFT_IEEE8023ADLAG:
3959 		bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen);
3960 		return (0);
3961 	default:
3962 		return (ENODEV);
3963 	}
3964 }
3965 
3966 /*
3967  * The name argument must be a pointer to storage which will last as
3968  * long as the interface does.  For physical devices, the result of
3969  * device_get_name(dev) is a good choice and for pseudo-devices a
3970  * static string works well.
3971  */
3972 void
3973 if_initname(struct ifnet *ifp, const char *name, int unit)
3974 {
3975 	ifp->if_dname = name;
3976 	ifp->if_dunit = unit;
3977 	if (unit != IF_DUNIT_NONE)
3978 		snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3979 	else
3980 		strlcpy(ifp->if_xname, name, IFNAMSIZ);
3981 }
3982 
3983 int
3984 if_printf(struct ifnet *ifp, const char *fmt, ...)
3985 {
3986 	char if_fmt[256];
3987 	va_list ap;
3988 
3989 	snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt);
3990 	va_start(ap, fmt);
3991 	vlog(LOG_INFO, if_fmt, ap);
3992 	va_end(ap);
3993 	return (0);
3994 }
3995 
3996 void
3997 if_start(struct ifnet *ifp)
3998 {
3999 
4000 	(*(ifp)->if_start)(ifp);
4001 }
4002 
4003 /*
4004  * Backwards compatibility interface for drivers
4005  * that have not implemented it
4006  */
4007 static int
4008 if_transmit(struct ifnet *ifp, struct mbuf *m)
4009 {
4010 	int error;
4011 
4012 	IFQ_HANDOFF(ifp, m, error);
4013 	return (error);
4014 }
4015 
4016 static void
4017 if_input_default(struct ifnet *ifp __unused, struct mbuf *m)
4018 {
4019 
4020 	m_freem(m);
4021 }
4022 
4023 int
4024 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
4025 {
4026 	int active = 0;
4027 
4028 	IF_LOCK(ifq);
4029 	if (_IF_QFULL(ifq)) {
4030 		IF_UNLOCK(ifq);
4031 		if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
4032 		m_freem(m);
4033 		return (0);
4034 	}
4035 	if (ifp != NULL) {
4036 		if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust);
4037 		if (m->m_flags & (M_BCAST|M_MCAST))
4038 			if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
4039 		active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
4040 	}
4041 	_IF_ENQUEUE(ifq, m);
4042 	IF_UNLOCK(ifq);
4043 	if (ifp != NULL && !active)
4044 		(*(ifp)->if_start)(ifp);
4045 	return (1);
4046 }
4047 
4048 void
4049 if_register_com_alloc(u_char type,
4050     if_com_alloc_t *a, if_com_free_t *f)
4051 {
4052 
4053 	KASSERT(if_com_alloc[type] == NULL,
4054 	    ("if_register_com_alloc: %d already registered", type));
4055 	KASSERT(if_com_free[type] == NULL,
4056 	    ("if_register_com_alloc: %d free already registered", type));
4057 
4058 	if_com_alloc[type] = a;
4059 	if_com_free[type] = f;
4060 }
4061 
4062 void
4063 if_deregister_com_alloc(u_char type)
4064 {
4065 
4066 	KASSERT(if_com_alloc[type] != NULL,
4067 	    ("if_deregister_com_alloc: %d not registered", type));
4068 	KASSERT(if_com_free[type] != NULL,
4069 	    ("if_deregister_com_alloc: %d free not registered", type));
4070 	if_com_alloc[type] = NULL;
4071 	if_com_free[type] = NULL;
4072 }
4073 
4074 /* API for driver access to network stack owned ifnet.*/
4075 uint64_t
4076 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate)
4077 {
4078 	uint64_t oldbrate;
4079 
4080 	oldbrate = ifp->if_baudrate;
4081 	ifp->if_baudrate = baudrate;
4082 	return (oldbrate);
4083 }
4084 
4085 uint64_t
4086 if_getbaudrate(if_t ifp)
4087 {
4088 
4089 	return (((struct ifnet *)ifp)->if_baudrate);
4090 }
4091 
4092 int
4093 if_setcapabilities(if_t ifp, int capabilities)
4094 {
4095 	((struct ifnet *)ifp)->if_capabilities = capabilities;
4096 	return (0);
4097 }
4098 
4099 int
4100 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit)
4101 {
4102 	((struct ifnet *)ifp)->if_capabilities |= setbit;
4103 	((struct ifnet *)ifp)->if_capabilities &= ~clearbit;
4104 
4105 	return (0);
4106 }
4107 
4108 int
4109 if_getcapabilities(if_t ifp)
4110 {
4111 	return ((struct ifnet *)ifp)->if_capabilities;
4112 }
4113 
4114 int
4115 if_setcapenable(if_t ifp, int capabilities)
4116 {
4117 	((struct ifnet *)ifp)->if_capenable = capabilities;
4118 	return (0);
4119 }
4120 
4121 int
4122 if_setcapenablebit(if_t ifp, int setcap, int clearcap)
4123 {
4124 	if(setcap)
4125 		((struct ifnet *)ifp)->if_capenable |= setcap;
4126 	if(clearcap)
4127 		((struct ifnet *)ifp)->if_capenable &= ~clearcap;
4128 
4129 	return (0);
4130 }
4131 
4132 const char *
4133 if_getdname(if_t ifp)
4134 {
4135 	return ((struct ifnet *)ifp)->if_dname;
4136 }
4137 
4138 int
4139 if_togglecapenable(if_t ifp, int togglecap)
4140 {
4141 	((struct ifnet *)ifp)->if_capenable ^= togglecap;
4142 	return (0);
4143 }
4144 
4145 int
4146 if_getcapenable(if_t ifp)
4147 {
4148 	return ((struct ifnet *)ifp)->if_capenable;
4149 }
4150 
4151 /*
4152  * This is largely undesirable because it ties ifnet to a device, but does
4153  * provide flexiblity for an embedded product vendor. Should be used with
4154  * the understanding that it violates the interface boundaries, and should be
4155  * a last resort only.
4156  */
4157 int
4158 if_setdev(if_t ifp, void *dev)
4159 {
4160 	return (0);
4161 }
4162 
4163 int
4164 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags)
4165 {
4166 	((struct ifnet *)ifp)->if_drv_flags |= set_flags;
4167 	((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags;
4168 
4169 	return (0);
4170 }
4171 
4172 int
4173 if_getdrvflags(if_t ifp)
4174 {
4175 	return ((struct ifnet *)ifp)->if_drv_flags;
4176 }
4177 
4178 int
4179 if_setdrvflags(if_t ifp, int flags)
4180 {
4181 	((struct ifnet *)ifp)->if_drv_flags = flags;
4182 	return (0);
4183 }
4184 
4185 
4186 int
4187 if_setflags(if_t ifp, int flags)
4188 {
4189 	((struct ifnet *)ifp)->if_flags = flags;
4190 	return (0);
4191 }
4192 
4193 int
4194 if_setflagbits(if_t ifp, int set, int clear)
4195 {
4196 	((struct ifnet *)ifp)->if_flags |= set;
4197 	((struct ifnet *)ifp)->if_flags &= ~clear;
4198 
4199 	return (0);
4200 }
4201 
4202 int
4203 if_getflags(if_t ifp)
4204 {
4205 	return ((struct ifnet *)ifp)->if_flags;
4206 }
4207 
4208 int
4209 if_clearhwassist(if_t ifp)
4210 {
4211 	((struct ifnet *)ifp)->if_hwassist = 0;
4212 	return (0);
4213 }
4214 
4215 int
4216 if_sethwassistbits(if_t ifp, int toset, int toclear)
4217 {
4218 	((struct ifnet *)ifp)->if_hwassist |= toset;
4219 	((struct ifnet *)ifp)->if_hwassist &= ~toclear;
4220 
4221 	return (0);
4222 }
4223 
4224 int
4225 if_sethwassist(if_t ifp, int hwassist_bit)
4226 {
4227 	((struct ifnet *)ifp)->if_hwassist = hwassist_bit;
4228 	return (0);
4229 }
4230 
4231 int
4232 if_gethwassist(if_t ifp)
4233 {
4234 	return ((struct ifnet *)ifp)->if_hwassist;
4235 }
4236 
4237 int
4238 if_setmtu(if_t ifp, int mtu)
4239 {
4240 	((struct ifnet *)ifp)->if_mtu = mtu;
4241 	return (0);
4242 }
4243 
4244 int
4245 if_getmtu(if_t ifp)
4246 {
4247 	return ((struct ifnet *)ifp)->if_mtu;
4248 }
4249 
4250 int
4251 if_getmtu_family(if_t ifp, int family)
4252 {
4253 	struct domain *dp;
4254 
4255 	for (dp = domains; dp; dp = dp->dom_next) {
4256 		if (dp->dom_family == family && dp->dom_ifmtu != NULL)
4257 			return (dp->dom_ifmtu((struct ifnet *)ifp));
4258 	}
4259 
4260 	return (((struct ifnet *)ifp)->if_mtu);
4261 }
4262 
4263 int
4264 if_setsoftc(if_t ifp, void *softc)
4265 {
4266 	((struct ifnet *)ifp)->if_softc = softc;
4267 	return (0);
4268 }
4269 
4270 void *
4271 if_getsoftc(if_t ifp)
4272 {
4273 	return ((struct ifnet *)ifp)->if_softc;
4274 }
4275 
4276 void
4277 if_setrcvif(struct mbuf *m, if_t ifp)
4278 {
4279 	m->m_pkthdr.rcvif = (struct ifnet *)ifp;
4280 }
4281 
4282 void
4283 if_setvtag(struct mbuf *m, uint16_t tag)
4284 {
4285 	m->m_pkthdr.ether_vtag = tag;
4286 }
4287 
4288 uint16_t
4289 if_getvtag(struct mbuf *m)
4290 {
4291 
4292 	return (m->m_pkthdr.ether_vtag);
4293 }
4294 
4295 int
4296 if_sendq_empty(if_t ifp)
4297 {
4298 	return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd);
4299 }
4300 
4301 struct ifaddr *
4302 if_getifaddr(if_t ifp)
4303 {
4304 	return ((struct ifnet *)ifp)->if_addr;
4305 }
4306 
4307 int
4308 if_getamcount(if_t ifp)
4309 {
4310 	return ((struct ifnet *)ifp)->if_amcount;
4311 }
4312 
4313 
4314 int
4315 if_setsendqready(if_t ifp)
4316 {
4317 	IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd);
4318 	return (0);
4319 }
4320 
4321 int
4322 if_setsendqlen(if_t ifp, int tx_desc_count)
4323 {
4324 	IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count);
4325 	((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count;
4326 
4327 	return (0);
4328 }
4329 
4330 int
4331 if_vlantrunkinuse(if_t ifp)
4332 {
4333 	return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0;
4334 }
4335 
4336 int
4337 if_input(if_t ifp, struct mbuf* sendmp)
4338 {
4339 	(*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp);
4340 	return (0);
4341 
4342 }
4343 
4344 /* XXX */
4345 #ifndef ETH_ADDR_LEN
4346 #define ETH_ADDR_LEN 6
4347 #endif
4348 
4349 int
4350 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max)
4351 {
4352 	struct ifmultiaddr *ifma;
4353 	uint8_t *lmta = (uint8_t *)mta;
4354 	int mcnt = 0;
4355 
4356 	CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) {
4357 		if (ifma->ifma_addr->sa_family != AF_LINK)
4358 			continue;
4359 
4360 		if (mcnt == max)
4361 			break;
4362 
4363 		bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
4364 		    &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN);
4365 		mcnt++;
4366 	}
4367 	*cnt = mcnt;
4368 
4369 	return (0);
4370 }
4371 
4372 int
4373 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max)
4374 {
4375 	int error;
4376 
4377 	if_maddr_rlock(ifp);
4378 	error = if_setupmultiaddr(ifp, mta, cnt, max);
4379 	if_maddr_runlock(ifp);
4380 	return (error);
4381 }
4382 
4383 int
4384 if_multiaddr_count(if_t ifp, int max)
4385 {
4386 	struct ifmultiaddr *ifma;
4387 	int count;
4388 
4389 	count = 0;
4390 	if_maddr_rlock(ifp);
4391 	CK_STAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) {
4392 		if (ifma->ifma_addr->sa_family != AF_LINK)
4393 			continue;
4394 		count++;
4395 		if (count == max)
4396 			break;
4397 	}
4398 	if_maddr_runlock(ifp);
4399 	return (count);
4400 }
4401 
4402 int
4403 if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg)
4404 {
4405 	struct ifmultiaddr *ifma;
4406 	int cnt = 0;
4407 
4408 	if_maddr_rlock(ifp);
4409 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
4410 		cnt += filter(arg, ifma, cnt);
4411 	if_maddr_runlock(ifp);
4412 	return (cnt);
4413 }
4414 
4415 struct mbuf *
4416 if_dequeue(if_t ifp)
4417 {
4418 	struct mbuf *m;
4419 	IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m);
4420 
4421 	return (m);
4422 }
4423 
4424 int
4425 if_sendq_prepend(if_t ifp, struct mbuf *m)
4426 {
4427 	IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m);
4428 	return (0);
4429 }
4430 
4431 int
4432 if_setifheaderlen(if_t ifp, int len)
4433 {
4434 	((struct ifnet *)ifp)->if_hdrlen = len;
4435 	return (0);
4436 }
4437 
4438 caddr_t
4439 if_getlladdr(if_t ifp)
4440 {
4441 	return (IF_LLADDR((struct ifnet *)ifp));
4442 }
4443 
4444 void *
4445 if_gethandle(u_char type)
4446 {
4447 	return (if_alloc(type));
4448 }
4449 
4450 void
4451 if_bpfmtap(if_t ifh, struct mbuf *m)
4452 {
4453 	struct ifnet *ifp = (struct ifnet *)ifh;
4454 
4455 	BPF_MTAP(ifp, m);
4456 }
4457 
4458 void
4459 if_etherbpfmtap(if_t ifh, struct mbuf *m)
4460 {
4461 	struct ifnet *ifp = (struct ifnet *)ifh;
4462 
4463 	ETHER_BPF_MTAP(ifp, m);
4464 }
4465 
4466 void
4467 if_vlancap(if_t ifh)
4468 {
4469 	struct ifnet *ifp = (struct ifnet *)ifh;
4470 	VLAN_CAPABILITIES(ifp);
4471 }
4472 
4473 int
4474 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax)
4475 {
4476 
4477 	((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax;
4478         return (0);
4479 }
4480 
4481 int
4482 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount)
4483 {
4484 
4485 	((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount;
4486         return (0);
4487 }
4488 
4489 int
4490 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize)
4491 {
4492 
4493 	((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize;
4494         return (0);
4495 }
4496 
4497 u_int
4498 if_gethwtsomax(if_t ifp)
4499 {
4500 
4501 	return (((struct ifnet *)ifp)->if_hw_tsomax);
4502 }
4503 
4504 u_int
4505 if_gethwtsomaxsegcount(if_t ifp)
4506 {
4507 
4508 	return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount);
4509 }
4510 
4511 u_int
4512 if_gethwtsomaxsegsize(if_t ifp)
4513 {
4514 
4515 	return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize);
4516 }
4517 
4518 void
4519 if_setinitfn(if_t ifp, void (*init_fn)(void *))
4520 {
4521 	((struct ifnet *)ifp)->if_init = init_fn;
4522 }
4523 
4524 void
4525 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t))
4526 {
4527 	((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn;
4528 }
4529 
4530 void
4531 if_setstartfn(if_t ifp, void (*start_fn)(if_t))
4532 {
4533 	((struct ifnet *)ifp)->if_start = (void *)start_fn;
4534 }
4535 
4536 void
4537 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn)
4538 {
4539 	((struct ifnet *)ifp)->if_transmit = start_fn;
4540 }
4541 
4542 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn)
4543 {
4544 	((struct ifnet *)ifp)->if_qflush = flush_fn;
4545 
4546 }
4547 
4548 void
4549 if_setgetcounterfn(if_t ifp, if_get_counter_t fn)
4550 {
4551 
4552 	ifp->if_get_counter = fn;
4553 }
4554 
4555 /* Revisit these - These are inline functions originally. */
4556 int
4557 drbr_inuse_drv(if_t ifh, struct buf_ring *br)
4558 {
4559 	return drbr_inuse(ifh, br);
4560 }
4561 
4562 struct mbuf*
4563 drbr_dequeue_drv(if_t ifh, struct buf_ring *br)
4564 {
4565 	return drbr_dequeue(ifh, br);
4566 }
4567 
4568 int
4569 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br)
4570 {
4571 	return drbr_needs_enqueue(ifh, br);
4572 }
4573 
4574 int
4575 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m)
4576 {
4577 	return drbr_enqueue(ifh, br, m);
4578 
4579 }
4580