xref: /freebsd/sys/net/if.c (revision 5b56413d04e608379c9a306373554a8e4d321bc0)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 2010 Bjoern A. Zeeb <bz@FreeBSD.org>
5  * Copyright (c) 1980, 1986, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include "opt_bpf.h"
34 #include "opt_inet6.h"
35 #include "opt_inet.h"
36 #include "opt_ddb.h"
37 
38 #include <sys/param.h>
39 #include <sys/capsicum.h>
40 #include <sys/conf.h>
41 #include <sys/eventhandler.h>
42 #include <sys/malloc.h>
43 #include <sys/domainset.h>
44 #include <sys/sbuf.h>
45 #include <sys/bus.h>
46 #include <sys/epoch.h>
47 #include <sys/mbuf.h>
48 #include <sys/systm.h>
49 #include <sys/priv.h>
50 #include <sys/proc.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/protosw.h>
54 #include <sys/kernel.h>
55 #include <sys/lock.h>
56 #include <sys/refcount.h>
57 #include <sys/module.h>
58 #include <sys/nv.h>
59 #include <sys/rwlock.h>
60 #include <sys/sockio.h>
61 #include <sys/syslog.h>
62 #include <sys/sysctl.h>
63 #include <sys/sysent.h>
64 #include <sys/taskqueue.h>
65 #include <sys/domain.h>
66 #include <sys/jail.h>
67 #include <sys/priv.h>
68 
69 #ifdef DDB
70 #include <ddb/ddb.h>
71 #endif
72 
73 #include <machine/stdarg.h>
74 #include <vm/uma.h>
75 
76 #include <net/bpf.h>
77 #include <net/ethernet.h>
78 #include <net/if.h>
79 #include <net/if_arp.h>
80 #include <net/if_clone.h>
81 #include <net/if_dl.h>
82 #include <net/if_strings.h>
83 #include <net/if_types.h>
84 #include <net/if_var.h>
85 #include <net/if_media.h>
86 #include <net/if_mib.h>
87 #include <net/if_private.h>
88 #include <net/if_vlan_var.h>
89 #include <net/radix.h>
90 #include <net/route.h>
91 #include <net/route/route_ctl.h>
92 #include <net/vnet.h>
93 
94 #if defined(INET) || defined(INET6)
95 #include <net/ethernet.h>
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #include <netinet/ip.h>
99 #include <netinet/ip_carp.h>
100 #ifdef INET
101 #include <net/debugnet.h>
102 #include <netinet/if_ether.h>
103 #endif /* INET */
104 #ifdef INET6
105 #include <netinet6/in6_var.h>
106 #include <netinet6/in6_ifattach.h>
107 #endif /* INET6 */
108 #endif /* INET || INET6 */
109 
110 #include <security/mac/mac_framework.h>
111 
112 /*
113  * Consumers of struct ifreq such as tcpdump assume no pad between ifr_name
114  * and ifr_ifru when it is used in SIOCGIFCONF.
115  */
116 _Static_assert(sizeof(((struct ifreq *)0)->ifr_name) ==
117     offsetof(struct ifreq, ifr_ifru), "gap between ifr_name and ifr_ifru");
118 
119 __read_mostly epoch_t net_epoch_preempt;
120 #ifdef COMPAT_FREEBSD32
121 #include <sys/mount.h>
122 #include <compat/freebsd32/freebsd32.h>
123 
124 struct ifreq_buffer32 {
125 	uint32_t	length;		/* (size_t) */
126 	uint32_t	buffer;		/* (void *) */
127 };
128 
129 /*
130  * Interface request structure used for socket
131  * ioctl's.  All interface ioctl's must have parameter
132  * definitions which begin with ifr_name.  The
133  * remainder may be interface specific.
134  */
135 struct ifreq32 {
136 	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
137 	union {
138 		struct sockaddr	ifru_addr;
139 		struct sockaddr	ifru_dstaddr;
140 		struct sockaddr	ifru_broadaddr;
141 		struct ifreq_buffer32 ifru_buffer;
142 		short		ifru_flags[2];
143 		short		ifru_index;
144 		int		ifru_jid;
145 		int		ifru_metric;
146 		int		ifru_mtu;
147 		int		ifru_phys;
148 		int		ifru_media;
149 		uint32_t	ifru_data;
150 		int		ifru_cap[2];
151 		u_int		ifru_fib;
152 		u_char		ifru_vlan_pcp;
153 	} ifr_ifru;
154 };
155 CTASSERT(sizeof(struct ifreq) == sizeof(struct ifreq32));
156 CTASSERT(__offsetof(struct ifreq, ifr_ifru) ==
157     __offsetof(struct ifreq32, ifr_ifru));
158 
159 struct ifconf32 {
160 	int32_t	ifc_len;
161 	union {
162 		uint32_t	ifcu_buf;
163 		uint32_t	ifcu_req;
164 	} ifc_ifcu;
165 };
166 #define	SIOCGIFCONF32	_IOWR('i', 36, struct ifconf32)
167 
168 struct ifdrv32 {
169 	char		ifd_name[IFNAMSIZ];
170 	uint32_t	ifd_cmd;
171 	uint32_t	ifd_len;
172 	uint32_t	ifd_data;
173 };
174 #define SIOCSDRVSPEC32	_IOC_NEWTYPE(SIOCSDRVSPEC, struct ifdrv32)
175 #define SIOCGDRVSPEC32	_IOC_NEWTYPE(SIOCGDRVSPEC, struct ifdrv32)
176 
177 struct ifgroupreq32 {
178 	char	ifgr_name[IFNAMSIZ];
179 	u_int	ifgr_len;
180 	union {
181 		char		ifgru_group[IFNAMSIZ];
182 		uint32_t	ifgru_groups;
183 	} ifgr_ifgru;
184 };
185 #define	SIOCAIFGROUP32	_IOC_NEWTYPE(SIOCAIFGROUP, struct ifgroupreq32)
186 #define	SIOCGIFGROUP32	_IOC_NEWTYPE(SIOCGIFGROUP, struct ifgroupreq32)
187 #define	SIOCDIFGROUP32	_IOC_NEWTYPE(SIOCDIFGROUP, struct ifgroupreq32)
188 #define	SIOCGIFGMEMB32	_IOC_NEWTYPE(SIOCGIFGMEMB, struct ifgroupreq32)
189 
190 struct ifmediareq32 {
191 	char		ifm_name[IFNAMSIZ];
192 	int		ifm_current;
193 	int		ifm_mask;
194 	int		ifm_status;
195 	int		ifm_active;
196 	int		ifm_count;
197 	uint32_t	ifm_ulist;	/* (int *) */
198 };
199 #define	SIOCGIFMEDIA32	_IOC_NEWTYPE(SIOCGIFMEDIA, struct ifmediareq32)
200 #define	SIOCGIFXMEDIA32	_IOC_NEWTYPE(SIOCGIFXMEDIA, struct ifmediareq32)
201 #endif /* COMPAT_FREEBSD32 */
202 
203 union ifreq_union {
204 	struct ifreq	ifr;
205 #ifdef COMPAT_FREEBSD32
206 	struct ifreq32	ifr32;
207 #endif
208 };
209 
210 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
211     "Link layers");
212 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
213     "Generic link-management");
214 
215 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN,
216     &ifqmaxlen, 0, "max send queue size");
217 
218 /* Log link state change events */
219 static int log_link_state_change = 1;
220 
221 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW,
222 	&log_link_state_change, 0,
223 	"log interface link state change events");
224 
225 /* Log promiscuous mode change events */
226 static int log_promisc_mode_change = 1;
227 
228 SYSCTL_INT(_net_link, OID_AUTO, log_promisc_mode_change, CTLFLAG_RDTUN,
229 	&log_promisc_mode_change, 1,
230 	"log promiscuous mode change events");
231 
232 /* Interface description */
233 static unsigned int ifdescr_maxlen = 1024;
234 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW,
235 	&ifdescr_maxlen, 0,
236 	"administrative maximum length for interface description");
237 
238 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions");
239 
240 /* global sx for non-critical path ifdescr */
241 static struct sx ifdescr_sx;
242 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr");
243 
244 void	(*ng_ether_link_state_p)(struct ifnet *ifp, int state);
245 void	(*lagg_linkstate_p)(struct ifnet *ifp, int state);
246 /* These are external hooks for CARP. */
247 void	(*carp_linkstate_p)(struct ifnet *ifp);
248 void	(*carp_demote_adj_p)(int, char *);
249 int	(*carp_master_p)(struct ifaddr *);
250 #if defined(INET) || defined(INET6)
251 int	(*carp_forus_p)(struct ifnet *ifp, u_char *dhost);
252 int	(*carp_output_p)(struct ifnet *ifp, struct mbuf *m,
253     const struct sockaddr *sa);
254 int	(*carp_ioctl_p)(struct ifreq *, u_long, struct thread *);
255 int	(*carp_attach_p)(struct ifaddr *, int);
256 void	(*carp_detach_p)(struct ifaddr *, bool);
257 #endif
258 #ifdef INET
259 int	(*carp_iamatch_p)(struct ifaddr *, uint8_t **);
260 #endif
261 #ifdef INET6
262 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6);
263 caddr_t	(*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m,
264     const struct in6_addr *taddr);
265 #endif
266 
267 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL;
268 
269 /*
270  * XXX: Style; these should be sorted alphabetically, and unprototyped
271  * static functions should be prototyped. Currently they are sorted by
272  * declaration order.
273  */
274 static void	if_attachdomain(void *);
275 static void	if_attachdomain1(struct ifnet *);
276 static int	ifconf(u_long, caddr_t);
277 static void	if_input_default(struct ifnet *, struct mbuf *);
278 static int	if_requestencap_default(struct ifnet *, struct if_encap_req *);
279 static int	if_setflag(struct ifnet *, int, int, int *, int);
280 static int	if_transmit_default(struct ifnet *ifp, struct mbuf *m);
281 static void	if_unroute(struct ifnet *, int flag, int fam);
282 static int	if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
283 static void	do_link_state_change(void *, int);
284 static int	if_getgroup(struct ifgroupreq *, struct ifnet *);
285 static int	if_getgroupmembers(struct ifgroupreq *);
286 static void	if_delgroups(struct ifnet *);
287 static void	if_attach_internal(struct ifnet *, bool);
288 static int	if_detach_internal(struct ifnet *, bool);
289 static void	if_siocaddmulti(void *, int);
290 static void	if_link_ifnet(struct ifnet *);
291 static bool	if_unlink_ifnet(struct ifnet *, bool);
292 #ifdef VIMAGE
293 static int	if_vmove(struct ifnet *, struct vnet *);
294 #endif
295 
296 #ifdef INET6
297 /*
298  * XXX: declare here to avoid to include many inet6 related files..
299  * should be more generalized?
300  */
301 extern void	nd6_setmtu(struct ifnet *);
302 #endif
303 
304 /* ipsec helper hooks */
305 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]);
306 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]);
307 
308 int	ifqmaxlen = IFQ_MAXLEN;
309 VNET_DEFINE(struct ifnethead, ifnet);	/* depend on static init XXX */
310 VNET_DEFINE(struct ifgrouphead, ifg_head);
311 
312 /* Table of ifnet by index. */
313 static int if_index;
314 static int if_indexlim = 8;
315 static struct ifindex_entry {
316 	struct ifnet	*ife_ifnet;
317 	uint16_t	ife_gencnt;
318 } *ifindex_table;
319 
320 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system,
321     CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
322     "Variables global to all interfaces");
323 static int
324 sysctl_ifcount(SYSCTL_HANDLER_ARGS)
325 {
326 	int rv = 0;
327 
328 	IFNET_RLOCK();
329 	for (int i = 1; i <= if_index; i++)
330 		if (ifindex_table[i].ife_ifnet != NULL &&
331 		    ifindex_table[i].ife_ifnet->if_vnet == curvnet)
332 			rv = i;
333 	IFNET_RUNLOCK();
334 
335 	return (sysctl_handle_int(oidp, &rv, 0, req));
336 }
337 SYSCTL_PROC(_net_link_generic_system, IFMIB_IFCOUNT, ifcount,
338     CTLTYPE_INT | CTLFLAG_VNET | CTLFLAG_RD, NULL, 0, sysctl_ifcount, "I",
339     "Maximum known interface index");
340 
341 /*
342  * The global network interface list (V_ifnet) and related state (such as
343  * if_index, if_indexlim, and ifindex_table) are protected by an sxlock.
344  * This may be acquired to stabilise the list, or we may rely on NET_EPOCH.
345  */
346 struct sx ifnet_sxlock;
347 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE);
348 
349 struct sx ifnet_detach_sxlock;
350 SX_SYSINIT_FLAGS(ifnet_detach, &ifnet_detach_sxlock, "ifnet_detach_sx",
351     SX_RECURSE);
352 
353 #ifdef VIMAGE
354 #define	VNET_IS_SHUTTING_DOWN(_vnet)					\
355     ((_vnet)->vnet_shutdown && (_vnet)->vnet_state < SI_SUB_VNET_DONE)
356 #endif
357 
358 static	if_com_alloc_t *if_com_alloc[256];
359 static	if_com_free_t *if_com_free[256];
360 
361 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
362 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
363 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
364 
365 struct ifnet *
366 ifnet_byindex(u_int idx)
367 {
368 	struct ifnet *ifp;
369 
370 	NET_EPOCH_ASSERT();
371 
372 	if (__predict_false(idx > if_index))
373 		return (NULL);
374 
375 	ifp = ck_pr_load_ptr(&ifindex_table[idx].ife_ifnet);
376 
377 	if (curvnet != NULL && ifp != NULL && ifp->if_vnet != curvnet)
378 		ifp = NULL;
379 
380 	return (ifp);
381 }
382 
383 struct ifnet *
384 ifnet_byindex_ref(u_int idx)
385 {
386 	struct ifnet *ifp;
387 
388 	ifp = ifnet_byindex(idx);
389 	if (ifp == NULL || (ifp->if_flags & IFF_DYING))
390 		return (NULL);
391 	if (!if_try_ref(ifp))
392 		return (NULL);
393 	return (ifp);
394 }
395 
396 struct ifnet *
397 ifnet_byindexgen(uint16_t idx, uint16_t gen)
398 {
399 	struct ifnet *ifp;
400 
401 	NET_EPOCH_ASSERT();
402 
403 	if (__predict_false(idx > if_index))
404 		return (NULL);
405 
406 	ifp = ck_pr_load_ptr(&ifindex_table[idx].ife_ifnet);
407 
408 	if (ifindex_table[idx].ife_gencnt == gen)
409 		return (ifp);
410 	else
411 		return (NULL);
412 }
413 
414 /*
415  * Network interface utility routines.
416  *
417  * Routines with ifa_ifwith* names take sockaddr *'s as
418  * parameters.
419  */
420 
421 static void
422 if_init_idxtable(void *arg __unused)
423 {
424 
425 	ifindex_table = malloc(if_indexlim * sizeof(*ifindex_table),
426 	    M_IFNET, M_WAITOK | M_ZERO);
427 }
428 SYSINIT(if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, if_init_idxtable, NULL);
429 
430 static void
431 vnet_if_init(const void *unused __unused)
432 {
433 
434 	CK_STAILQ_INIT(&V_ifnet);
435 	CK_STAILQ_INIT(&V_ifg_head);
436 	vnet_if_clone_init();
437 }
438 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
439     NULL);
440 
441 static void
442 if_link_ifnet(struct ifnet *ifp)
443 {
444 
445 	IFNET_WLOCK();
446 	CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
447 #ifdef VIMAGE
448 	curvnet->vnet_ifcnt++;
449 #endif
450 	IFNET_WUNLOCK();
451 }
452 
453 static bool
454 if_unlink_ifnet(struct ifnet *ifp, bool vmove)
455 {
456 	struct ifnet *iter;
457 	int found = 0;
458 
459 	IFNET_WLOCK();
460 	CK_STAILQ_FOREACH(iter, &V_ifnet, if_link)
461 		if (iter == ifp) {
462 			CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link);
463 			if (!vmove)
464 				ifp->if_flags |= IFF_DYING;
465 			found = 1;
466 			break;
467 		}
468 #ifdef VIMAGE
469 	curvnet->vnet_ifcnt--;
470 #endif
471 	IFNET_WUNLOCK();
472 
473 	return (found);
474 }
475 
476 #ifdef VIMAGE
477 static void
478 vnet_if_return(const void *unused __unused)
479 {
480 	struct ifnet *ifp, *nifp;
481 	struct ifnet **pending;
482 	int found __diagused;
483 	int i;
484 
485 	i = 0;
486 
487 	/*
488 	 * We need to protect our access to the V_ifnet tailq. Ordinarily we'd
489 	 * enter NET_EPOCH, but that's not possible, because if_vmove() calls
490 	 * if_detach_internal(), which waits for NET_EPOCH callbacks to
491 	 * complete. We can't do that from within NET_EPOCH.
492 	 *
493 	 * However, we can also use the IFNET_xLOCK, which is the V_ifnet
494 	 * read/write lock. We cannot hold the lock as we call if_vmove()
495 	 * though, as that presents LOR w.r.t ifnet_sx, in_multi_sx and iflib
496 	 * ctx lock.
497 	 */
498 	IFNET_WLOCK();
499 
500 	pending = malloc(sizeof(struct ifnet *) * curvnet->vnet_ifcnt,
501 	    M_IFNET, M_WAITOK | M_ZERO);
502 
503 	/* Return all inherited interfaces to their parent vnets. */
504 	CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
505 		if (ifp->if_home_vnet != ifp->if_vnet) {
506 			found = if_unlink_ifnet(ifp, true);
507 			MPASS(found);
508 
509 			pending[i++] = ifp;
510 		}
511 	}
512 	IFNET_WUNLOCK();
513 
514 	for (int j = 0; j < i; j++) {
515 		sx_xlock(&ifnet_detach_sxlock);
516 		if_vmove(pending[j], pending[j]->if_home_vnet);
517 		sx_xunlock(&ifnet_detach_sxlock);
518 	}
519 
520 	free(pending, M_IFNET);
521 }
522 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY,
523     vnet_if_return, NULL);
524 #endif
525 
526 /*
527  * Allocate a struct ifnet and an index for an interface.  A layer 2
528  * common structure will also be allocated if an allocation routine is
529  * registered for the passed type.
530  */
531 static struct ifnet *
532 if_alloc_domain(u_char type, int numa_domain)
533 {
534 	struct ifnet *ifp;
535 	u_short idx;
536 
537 	KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large"));
538 	if (numa_domain == IF_NODOM)
539 		ifp = malloc(sizeof(struct ifnet), M_IFNET,
540 		    M_WAITOK | M_ZERO);
541 	else
542 		ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET,
543 		    DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO);
544 	ifp->if_type = type;
545 	ifp->if_alloctype = type;
546 	ifp->if_numa_domain = numa_domain;
547 #ifdef VIMAGE
548 	ifp->if_vnet = curvnet;
549 #endif
550 	if (if_com_alloc[type] != NULL) {
551 		ifp->if_l2com = if_com_alloc[type](type, ifp);
552 		KASSERT(ifp->if_l2com, ("%s: if_com_alloc[%u] failed", __func__,
553 		    type));
554 	}
555 
556 	IF_ADDR_LOCK_INIT(ifp);
557 	TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
558 	TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp);
559 	ifp->if_afdata_initialized = 0;
560 	IF_AFDATA_LOCK_INIT(ifp);
561 	CK_STAILQ_INIT(&ifp->if_addrhead);
562 	CK_STAILQ_INIT(&ifp->if_multiaddrs);
563 	CK_STAILQ_INIT(&ifp->if_groups);
564 #ifdef MAC
565 	mac_ifnet_init(ifp);
566 #endif
567 	ifq_init(&ifp->if_snd, ifp);
568 
569 	refcount_init(&ifp->if_refcount, 1);	/* Index reference. */
570 	for (int i = 0; i < IFCOUNTERS; i++)
571 		ifp->if_counters[i] = counter_u64_alloc(M_WAITOK);
572 	ifp->if_get_counter = if_get_counter_default;
573 	ifp->if_pcp = IFNET_PCP_NONE;
574 
575 	/* Allocate an ifindex array entry. */
576 	IFNET_WLOCK();
577 	/*
578 	 * Try to find an empty slot below if_index.  If we fail, take the
579 	 * next slot.
580 	 */
581 	for (idx = 1; idx <= if_index; idx++) {
582 		if (ifindex_table[idx].ife_ifnet == NULL)
583 			break;
584 	}
585 
586 	/* Catch if_index overflow. */
587 	if (idx >= if_indexlim) {
588 		struct ifindex_entry *new, *old;
589 		int newlim;
590 
591 		newlim = if_indexlim * 2;
592 		new = malloc(newlim * sizeof(*new), M_IFNET, M_WAITOK | M_ZERO);
593 		memcpy(new, ifindex_table, if_indexlim * sizeof(*new));
594 		old = ifindex_table;
595 		ck_pr_store_ptr(&ifindex_table, new);
596 		if_indexlim = newlim;
597 		NET_EPOCH_WAIT();
598 		free(old, M_IFNET);
599 	}
600 	if (idx > if_index)
601 		if_index = idx;
602 
603 	ifp->if_index = idx;
604 	ifp->if_idxgen = ifindex_table[idx].ife_gencnt;
605 	ck_pr_store_ptr(&ifindex_table[idx].ife_ifnet, ifp);
606 	IFNET_WUNLOCK();
607 
608 	return (ifp);
609 }
610 
611 struct ifnet *
612 if_alloc_dev(u_char type, device_t dev)
613 {
614 	int numa_domain;
615 
616 	if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0)
617 		return (if_alloc_domain(type, IF_NODOM));
618 	return (if_alloc_domain(type, numa_domain));
619 }
620 
621 struct ifnet *
622 if_alloc(u_char type)
623 {
624 
625 	return (if_alloc_domain(type, IF_NODOM));
626 }
627 /*
628  * Do the actual work of freeing a struct ifnet, and layer 2 common
629  * structure.  This call is made when the network epoch guarantees
630  * us that nobody holds a pointer to the interface.
631  */
632 static void
633 if_free_deferred(epoch_context_t ctx)
634 {
635 	struct ifnet *ifp = __containerof(ctx, struct ifnet, if_epoch_ctx);
636 
637 	KASSERT((ifp->if_flags & IFF_DYING),
638 	    ("%s: interface not dying", __func__));
639 
640 	if (if_com_free[ifp->if_alloctype] != NULL)
641 		if_com_free[ifp->if_alloctype](ifp->if_l2com,
642 		    ifp->if_alloctype);
643 
644 #ifdef MAC
645 	mac_ifnet_destroy(ifp);
646 #endif /* MAC */
647 	IF_AFDATA_DESTROY(ifp);
648 	IF_ADDR_LOCK_DESTROY(ifp);
649 	ifq_delete(&ifp->if_snd);
650 
651 	for (int i = 0; i < IFCOUNTERS; i++)
652 		counter_u64_free(ifp->if_counters[i]);
653 
654 	if_freedescr(ifp->if_description);
655 	free(ifp->if_hw_addr, M_IFADDR);
656 	free(ifp, M_IFNET);
657 }
658 
659 /*
660  * Deregister an interface and free the associated storage.
661  */
662 void
663 if_free(struct ifnet *ifp)
664 {
665 
666 	ifp->if_flags |= IFF_DYING;			/* XXX: Locking */
667 
668 	/*
669 	 * XXXGL: An interface index is really an alias to ifp pointer.
670 	 * Why would we clear the alias now, and not in the deferred
671 	 * context?  Indeed there is nothing wrong with some network
672 	 * thread obtaining ifp via ifnet_byindex() inside the network
673 	 * epoch and then dereferencing ifp while we perform if_free(),
674 	 * and after if_free() finished, too.
675 	 *
676 	 * This early index freeing was important back when ifindex was
677 	 * virtualized and interface would outlive the vnet.
678 	 */
679 	IFNET_WLOCK();
680 	MPASS(ifindex_table[ifp->if_index].ife_ifnet == ifp);
681 	ck_pr_store_ptr(&ifindex_table[ifp->if_index].ife_ifnet, NULL);
682 	ifindex_table[ifp->if_index].ife_gencnt++;
683 	while (if_index > 0 && ifindex_table[if_index].ife_ifnet == NULL)
684 		if_index--;
685 	IFNET_WUNLOCK();
686 
687 	if (refcount_release(&ifp->if_refcount))
688 		NET_EPOCH_CALL(if_free_deferred, &ifp->if_epoch_ctx);
689 }
690 
691 /*
692  * Interfaces to keep an ifnet type-stable despite the possibility of the
693  * driver calling if_free().  If there are additional references, we defer
694  * freeing the underlying data structure.
695  */
696 void
697 if_ref(struct ifnet *ifp)
698 {
699 	u_int old __diagused;
700 
701 	/* We don't assert the ifnet list lock here, but arguably should. */
702 	old = refcount_acquire(&ifp->if_refcount);
703 	KASSERT(old > 0, ("%s: ifp %p has 0 refs", __func__, ifp));
704 }
705 
706 bool
707 if_try_ref(struct ifnet *ifp)
708 {
709 	NET_EPOCH_ASSERT();
710 	return (refcount_acquire_if_not_zero(&ifp->if_refcount));
711 }
712 
713 void
714 if_rele(struct ifnet *ifp)
715 {
716 
717 	if (!refcount_release(&ifp->if_refcount))
718 		return;
719 	NET_EPOCH_CALL(if_free_deferred, &ifp->if_epoch_ctx);
720 }
721 
722 void
723 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
724 {
725 
726 	mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
727 
728 	if (ifq->ifq_maxlen == 0)
729 		ifq->ifq_maxlen = ifqmaxlen;
730 
731 	ifq->altq_type = 0;
732 	ifq->altq_disc = NULL;
733 	ifq->altq_flags &= ALTQF_CANTCHANGE;
734 	ifq->altq_tbr  = NULL;
735 	ifq->altq_ifp  = ifp;
736 }
737 
738 void
739 ifq_delete(struct ifaltq *ifq)
740 {
741 	mtx_destroy(&ifq->ifq_mtx);
742 }
743 
744 /*
745  * Perform generic interface initialization tasks and attach the interface
746  * to the list of "active" interfaces.  If vmove flag is set on entry
747  * to if_attach_internal(), perform only a limited subset of initialization
748  * tasks, given that we are moving from one vnet to another an ifnet which
749  * has already been fully initialized.
750  *
751  * Note that if_detach_internal() removes group membership unconditionally
752  * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL.
753  * Thus, when if_vmove() is applied to a cloned interface, group membership
754  * is lost while a cloned one always joins a group whose name is
755  * ifc->ifc_name.  To recover this after if_detach_internal() and
756  * if_attach_internal(), the cloner should be specified to
757  * if_attach_internal() via ifc.  If it is non-NULL, if_attach_internal()
758  * attempts to join a group whose name is ifc->ifc_name.
759  *
760  * XXX:
761  *  - The decision to return void and thus require this function to
762  *    succeed is questionable.
763  *  - We should probably do more sanity checking.  For instance we don't
764  *    do anything to insure if_xname is unique or non-empty.
765  */
766 void
767 if_attach(struct ifnet *ifp)
768 {
769 
770 	if_attach_internal(ifp, false);
771 }
772 
773 /*
774  * Compute the least common TSO limit.
775  */
776 void
777 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax)
778 {
779 	/*
780 	 * 1) If there is no limit currently, take the limit from
781 	 * the network adapter.
782 	 *
783 	 * 2) If the network adapter has a limit below the current
784 	 * limit, apply it.
785 	 */
786 	if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
787 	    ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
788 		pmax->tsomaxbytes = ifp->if_hw_tsomax;
789 	}
790 	if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
791 	    ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
792 		pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
793 	}
794 	if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
795 	    ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
796 		pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
797 	}
798 }
799 
800 /*
801  * Update TSO limit of a network adapter.
802  *
803  * Returns zero if no change. Else non-zero.
804  */
805 int
806 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax)
807 {
808 	int retval = 0;
809 	if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
810 		ifp->if_hw_tsomax = pmax->tsomaxbytes;
811 		retval++;
812 	}
813 	if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
814 		ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
815 		retval++;
816 	}
817 	if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
818 		ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
819 		retval++;
820 	}
821 	return (retval);
822 }
823 
824 static void
825 if_attach_internal(struct ifnet *ifp, bool vmove)
826 {
827 	unsigned socksize, ifasize;
828 	int namelen, masklen;
829 	struct sockaddr_dl *sdl;
830 	struct ifaddr *ifa;
831 
832 	MPASS(ifindex_table[ifp->if_index].ife_ifnet == ifp);
833 
834 #ifdef VIMAGE
835 	ifp->if_vnet = curvnet;
836 	if (ifp->if_home_vnet == NULL)
837 		ifp->if_home_vnet = curvnet;
838 #endif
839 
840 	if_addgroup(ifp, IFG_ALL);
841 
842 #ifdef VIMAGE
843 	/* Restore group membership for cloned interface. */
844 	if (vmove)
845 		if_clone_restoregroup(ifp);
846 #endif
847 
848 	getmicrotime(&ifp->if_lastchange);
849 	ifp->if_epoch = time_uptime;
850 
851 	KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
852 	    (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
853 	    ("transmit and qflush must both either be set or both be NULL"));
854 	if (ifp->if_transmit == NULL) {
855 		ifp->if_transmit = if_transmit_default;
856 		ifp->if_qflush = if_qflush;
857 	}
858 	if (ifp->if_input == NULL)
859 		ifp->if_input = if_input_default;
860 
861 	if (ifp->if_requestencap == NULL)
862 		ifp->if_requestencap = if_requestencap_default;
863 
864 	if (!vmove) {
865 #ifdef MAC
866 		mac_ifnet_create(ifp);
867 #endif
868 
869 		/*
870 		 * Create a Link Level name for this device.
871 		 */
872 		namelen = strlen(ifp->if_xname);
873 		/*
874 		 * Always save enough space for any possiable name so we
875 		 * can do a rename in place later.
876 		 */
877 		masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
878 		socksize = masklen + ifp->if_addrlen;
879 		if (socksize < sizeof(*sdl))
880 			socksize = sizeof(*sdl);
881 		socksize = roundup2(socksize, sizeof(long));
882 		ifasize = sizeof(*ifa) + 2 * socksize;
883 		ifa = ifa_alloc(ifasize, M_WAITOK);
884 		sdl = (struct sockaddr_dl *)(ifa + 1);
885 		sdl->sdl_len = socksize;
886 		sdl->sdl_family = AF_LINK;
887 		bcopy(ifp->if_xname, sdl->sdl_data, namelen);
888 		sdl->sdl_nlen = namelen;
889 		sdl->sdl_index = ifp->if_index;
890 		sdl->sdl_type = ifp->if_type;
891 		ifp->if_addr = ifa;
892 		ifa->ifa_ifp = ifp;
893 		ifa->ifa_addr = (struct sockaddr *)sdl;
894 		sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
895 		ifa->ifa_netmask = (struct sockaddr *)sdl;
896 		sdl->sdl_len = masklen;
897 		while (namelen != 0)
898 			sdl->sdl_data[--namelen] = 0xff;
899 		CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
900 		/* Reliably crash if used uninitialized. */
901 		ifp->if_broadcastaddr = NULL;
902 
903 		if (ifp->if_type == IFT_ETHER) {
904 			ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR,
905 			    M_WAITOK | M_ZERO);
906 		}
907 
908 #if defined(INET) || defined(INET6)
909 		/* Use defaults for TSO, if nothing is set */
910 		if (ifp->if_hw_tsomax == 0 &&
911 		    ifp->if_hw_tsomaxsegcount == 0 &&
912 		    ifp->if_hw_tsomaxsegsize == 0) {
913 			/*
914 			 * The TSO defaults needs to be such that an
915 			 * NFS mbuf list of 35 mbufs totalling just
916 			 * below 64K works and that a chain of mbufs
917 			 * can be defragged into at most 32 segments:
918 			 */
919 			ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
920 			    (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
921 			ifp->if_hw_tsomaxsegcount = 35;
922 			ifp->if_hw_tsomaxsegsize = 2048;	/* 2K */
923 
924 			/* XXX some drivers set IFCAP_TSO after ethernet attach */
925 			if (ifp->if_capabilities & IFCAP_TSO) {
926 				if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
927 				    ifp->if_hw_tsomax,
928 				    ifp->if_hw_tsomaxsegcount,
929 				    ifp->if_hw_tsomaxsegsize);
930 			}
931 		}
932 #endif
933 	}
934 #ifdef VIMAGE
935 	else {
936 		/*
937 		 * Update the interface index in the link layer address
938 		 * of the interface.
939 		 */
940 		for (ifa = ifp->if_addr; ifa != NULL;
941 		    ifa = CK_STAILQ_NEXT(ifa, ifa_link)) {
942 			if (ifa->ifa_addr->sa_family == AF_LINK) {
943 				sdl = (struct sockaddr_dl *)ifa->ifa_addr;
944 				sdl->sdl_index = ifp->if_index;
945 			}
946 		}
947 	}
948 #endif
949 
950 	if_link_ifnet(ifp);
951 
952 	if (domain_init_status >= 2)
953 		if_attachdomain1(ifp);
954 
955 	EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
956 	if (IS_DEFAULT_VNET(curvnet))
957 		devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
958 }
959 
960 static void
961 if_epochalloc(void *dummy __unused)
962 {
963 
964 	net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT);
965 }
966 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL);
967 
968 static void
969 if_attachdomain(void *dummy)
970 {
971 	struct ifnet *ifp;
972 
973 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link)
974 		if_attachdomain1(ifp);
975 }
976 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
977     if_attachdomain, NULL);
978 
979 static void
980 if_attachdomain1(struct ifnet *ifp)
981 {
982 	struct domain *dp;
983 
984 	/*
985 	 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
986 	 * cannot lock ifp->if_afdata initialization, entirely.
987 	 */
988 	IF_AFDATA_LOCK(ifp);
989 	if (ifp->if_afdata_initialized >= domain_init_status) {
990 		IF_AFDATA_UNLOCK(ifp);
991 		log(LOG_WARNING, "%s called more than once on %s\n",
992 		    __func__, ifp->if_xname);
993 		return;
994 	}
995 	ifp->if_afdata_initialized = domain_init_status;
996 	IF_AFDATA_UNLOCK(ifp);
997 
998 	/* address family dependent data region */
999 	bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
1000 	SLIST_FOREACH(dp, &domains, dom_next) {
1001 		if (dp->dom_ifattach)
1002 			ifp->if_afdata[dp->dom_family] =
1003 			    (*dp->dom_ifattach)(ifp);
1004 	}
1005 }
1006 
1007 /*
1008  * Remove any unicast or broadcast network addresses from an interface.
1009  */
1010 void
1011 if_purgeaddrs(struct ifnet *ifp)
1012 {
1013 	struct ifaddr *ifa;
1014 
1015 #ifdef INET6
1016 	/*
1017 	 * Need to leave multicast addresses of proxy NDP llentries
1018 	 * before in6_purgeifaddr() because the llentries are keys
1019 	 * for in6_multi objects of proxy NDP entries.
1020 	 * in6_purgeifaddr()s clean up llentries including proxy NDPs
1021 	 * then we would lose the keys if they are called earlier.
1022 	 */
1023 	in6_purge_proxy_ndp(ifp);
1024 #endif
1025 	while (1) {
1026 		struct epoch_tracker et;
1027 
1028 		NET_EPOCH_ENTER(et);
1029 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1030 			if (ifa->ifa_addr->sa_family != AF_LINK)
1031 				break;
1032 		}
1033 		NET_EPOCH_EXIT(et);
1034 
1035 		if (ifa == NULL)
1036 			break;
1037 #ifdef INET
1038 		/* XXX: Ugly!! ad hoc just for INET */
1039 		if (ifa->ifa_addr->sa_family == AF_INET) {
1040 			struct ifreq ifr;
1041 
1042 			bzero(&ifr, sizeof(ifr));
1043 			ifr.ifr_addr = *ifa->ifa_addr;
1044 			if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
1045 			    NULL) == 0)
1046 				continue;
1047 		}
1048 #endif /* INET */
1049 #ifdef INET6
1050 		if (ifa->ifa_addr->sa_family == AF_INET6) {
1051 			in6_purgeifaddr((struct in6_ifaddr *)ifa);
1052 			/* ifp_addrhead is already updated */
1053 			continue;
1054 		}
1055 #endif /* INET6 */
1056 		IF_ADDR_WLOCK(ifp);
1057 		CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
1058 		IF_ADDR_WUNLOCK(ifp);
1059 		ifa_free(ifa);
1060 	}
1061 }
1062 
1063 /*
1064  * Remove any multicast network addresses from an interface when an ifnet
1065  * is going away.
1066  */
1067 static void
1068 if_purgemaddrs(struct ifnet *ifp)
1069 {
1070 	struct ifmultiaddr *ifma;
1071 
1072 	IF_ADDR_WLOCK(ifp);
1073 	while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) {
1074 		ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs);
1075 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
1076 		if_delmulti_locked(ifp, ifma, 1);
1077 	}
1078 	IF_ADDR_WUNLOCK(ifp);
1079 }
1080 
1081 /*
1082  * Detach an interface, removing it from the list of "active" interfaces.
1083  * If vmove flag is set on entry to if_detach_internal(), perform only a
1084  * limited subset of cleanup tasks, given that we are moving an ifnet from
1085  * one vnet to another, where it must be fully operational.
1086  *
1087  * XXXRW: There are some significant questions about event ordering, and
1088  * how to prevent things from starting to use the interface during detach.
1089  */
1090 void
1091 if_detach(struct ifnet *ifp)
1092 {
1093 	bool found;
1094 
1095 	CURVNET_SET_QUIET(ifp->if_vnet);
1096 	found = if_unlink_ifnet(ifp, false);
1097 	if (found) {
1098 		sx_xlock(&ifnet_detach_sxlock);
1099 		if_detach_internal(ifp, false);
1100 		sx_xunlock(&ifnet_detach_sxlock);
1101 	}
1102 	CURVNET_RESTORE();
1103 }
1104 
1105 /*
1106  * The vmove flag, if set, indicates that we are called from a callpath
1107  * that is moving an interface to a different vnet instance.
1108  *
1109  * The shutdown flag, if set, indicates that we are called in the
1110  * process of shutting down a vnet instance.  Currently only the
1111  * vnet_if_return SYSUNINIT function sets it.  Note: we can be called
1112  * on a vnet instance shutdown without this flag being set, e.g., when
1113  * the cloned interfaces are destoyed as first thing of teardown.
1114  */
1115 static int
1116 if_detach_internal(struct ifnet *ifp, bool vmove)
1117 {
1118 	struct ifaddr *ifa;
1119 	int i;
1120 	struct domain *dp;
1121 #ifdef VIMAGE
1122 	bool shutdown;
1123 
1124 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1125 #endif
1126 
1127 	sx_assert(&ifnet_detach_sxlock, SX_XLOCKED);
1128 
1129 	/*
1130 	 * At this point we know the interface still was on the ifnet list
1131 	 * and we removed it so we are in a stable state.
1132 	 */
1133 	NET_EPOCH_WAIT();
1134 
1135 	/*
1136 	 * Ensure all pending EPOCH(9) callbacks have been executed. This
1137 	 * fixes issues about late destruction of multicast options
1138 	 * which lead to leave group calls, which in turn access the
1139 	 * belonging ifnet structure:
1140 	 */
1141 	NET_EPOCH_DRAIN_CALLBACKS();
1142 
1143 	/*
1144 	 * In any case (destroy or vmove) detach us from the groups
1145 	 * and remove/wait for pending events on the taskq.
1146 	 * XXX-BZ in theory an interface could still enqueue a taskq change?
1147 	 */
1148 	if_delgroups(ifp);
1149 
1150 	taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
1151 	taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask);
1152 
1153 	if_down(ifp);
1154 
1155 #ifdef VIMAGE
1156 	/*
1157 	 * On VNET shutdown abort here as the stack teardown will do all
1158 	 * the work top-down for us.
1159 	 */
1160 	if (shutdown) {
1161 		/* Give interface users the chance to clean up. */
1162 		EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1163 
1164 		/*
1165 		 * In case of a vmove we are done here without error.
1166 		 * If we would signal an error it would lead to the same
1167 		 * abort as if we did not find the ifnet anymore.
1168 		 * if_detach() calls us in void context and does not care
1169 		 * about an early abort notification, so life is splendid :)
1170 		 */
1171 		goto finish_vnet_shutdown;
1172 	}
1173 #endif
1174 
1175 	/*
1176 	 * At this point we are not tearing down a VNET and are either
1177 	 * going to destroy or vmove the interface and have to cleanup
1178 	 * accordingly.
1179 	 */
1180 
1181 	/*
1182 	 * Remove routes and flush queues.
1183 	 */
1184 #ifdef ALTQ
1185 	if (ALTQ_IS_ENABLED(&ifp->if_snd))
1186 		altq_disable(&ifp->if_snd);
1187 	if (ALTQ_IS_ATTACHED(&ifp->if_snd))
1188 		altq_detach(&ifp->if_snd);
1189 #endif
1190 
1191 	if_purgeaddrs(ifp);
1192 
1193 #ifdef INET
1194 	in_ifdetach(ifp);
1195 #endif
1196 
1197 #ifdef INET6
1198 	/*
1199 	 * Remove all IPv6 kernel structs related to ifp.  This should be done
1200 	 * before removing routing entries below, since IPv6 interface direct
1201 	 * routes are expected to be removed by the IPv6-specific kernel API.
1202 	 * Otherwise, the kernel will detect some inconsistency and bark it.
1203 	 */
1204 	in6_ifdetach(ifp);
1205 #endif
1206 	if_purgemaddrs(ifp);
1207 
1208 	EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1209 	if (IS_DEFAULT_VNET(curvnet))
1210 		devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
1211 
1212 	if (!vmove) {
1213 		/*
1214 		 * Prevent further calls into the device driver via ifnet.
1215 		 */
1216 		if_dead(ifp);
1217 
1218 		/*
1219 		 * Clean up all addresses.
1220 		 */
1221 		IF_ADDR_WLOCK(ifp);
1222 		if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) {
1223 			ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
1224 			CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
1225 			IF_ADDR_WUNLOCK(ifp);
1226 			ifa_free(ifa);
1227 		} else
1228 			IF_ADDR_WUNLOCK(ifp);
1229 	}
1230 
1231 	rt_flushifroutes(ifp);
1232 
1233 #ifdef VIMAGE
1234 finish_vnet_shutdown:
1235 #endif
1236 	/*
1237 	 * We cannot hold the lock over dom_ifdetach calls as they might
1238 	 * sleep, for example trying to drain a callout, thus open up the
1239 	 * theoretical race with re-attaching.
1240 	 */
1241 	IF_AFDATA_LOCK(ifp);
1242 	i = ifp->if_afdata_initialized;
1243 	ifp->if_afdata_initialized = 0;
1244 	IF_AFDATA_UNLOCK(ifp);
1245 	if (i == 0)
1246 		return (0);
1247 	SLIST_FOREACH(dp, &domains, dom_next) {
1248 		if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) {
1249 			(*dp->dom_ifdetach)(ifp,
1250 			    ifp->if_afdata[dp->dom_family]);
1251 			ifp->if_afdata[dp->dom_family] = NULL;
1252 		}
1253 	}
1254 
1255 	return (0);
1256 }
1257 
1258 #ifdef VIMAGE
1259 /*
1260  * if_vmove() performs a limited version of if_detach() in current
1261  * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
1262  */
1263 static int
1264 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
1265 {
1266 	int rc;
1267 
1268 	/*
1269 	 * Detach from current vnet, but preserve LLADDR info, do not
1270 	 * mark as dead etc. so that the ifnet can be reattached later.
1271 	 * If we cannot find it, we lost the race to someone else.
1272 	 */
1273 	rc = if_detach_internal(ifp, true);
1274 	if (rc != 0)
1275 		return (rc);
1276 
1277 	/*
1278 	 * Perform interface-specific reassignment tasks, if provided by
1279 	 * the driver.
1280 	 */
1281 	if (ifp->if_reassign != NULL)
1282 		ifp->if_reassign(ifp, new_vnet, NULL);
1283 
1284 	/*
1285 	 * Switch to the context of the target vnet.
1286 	 */
1287 	CURVNET_SET_QUIET(new_vnet);
1288 	if_attach_internal(ifp, true);
1289 	CURVNET_RESTORE();
1290 	return (0);
1291 }
1292 
1293 /*
1294  * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1295  */
1296 static int
1297 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1298 {
1299 	struct prison *pr;
1300 	struct ifnet *difp;
1301 	int error;
1302 	bool found __diagused;
1303 	bool shutdown;
1304 
1305 	MPASS(ifindex_table[ifp->if_index].ife_ifnet == ifp);
1306 
1307 	/* Try to find the prison within our visibility. */
1308 	sx_slock(&allprison_lock);
1309 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1310 	sx_sunlock(&allprison_lock);
1311 	if (pr == NULL)
1312 		return (ENXIO);
1313 	prison_hold_locked(pr);
1314 	mtx_unlock(&pr->pr_mtx);
1315 
1316 	/* Do not try to move the iface from and to the same prison. */
1317 	if (pr->pr_vnet == ifp->if_vnet) {
1318 		prison_free(pr);
1319 		return (EEXIST);
1320 	}
1321 
1322 	/* Make sure the named iface does not exists in the dst. prison/vnet. */
1323 	/* XXX Lock interfaces to avoid races. */
1324 	CURVNET_SET_QUIET(pr->pr_vnet);
1325 	difp = ifunit(ifname);
1326 	CURVNET_RESTORE();
1327 	if (difp != NULL) {
1328 		prison_free(pr);
1329 		return (EEXIST);
1330 	}
1331 	sx_xlock(&ifnet_detach_sxlock);
1332 
1333 	/* Make sure the VNET is stable. */
1334 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1335 	if (shutdown) {
1336 		sx_xunlock(&ifnet_detach_sxlock);
1337 		prison_free(pr);
1338 		return (EBUSY);
1339 	}
1340 
1341 	found = if_unlink_ifnet(ifp, true);
1342 	if (! found) {
1343 		sx_xunlock(&ifnet_detach_sxlock);
1344 		prison_free(pr);
1345 		return (ENODEV);
1346 	}
1347 
1348 	/* Move the interface into the child jail/vnet. */
1349 	error = if_vmove(ifp, pr->pr_vnet);
1350 
1351 	/* Report the new if_xname back to the userland on success. */
1352 	if (error == 0)
1353 		sprintf(ifname, "%s", ifp->if_xname);
1354 
1355 	sx_xunlock(&ifnet_detach_sxlock);
1356 
1357 	prison_free(pr);
1358 	return (error);
1359 }
1360 
1361 static int
1362 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1363 {
1364 	struct prison *pr;
1365 	struct vnet *vnet_dst;
1366 	struct ifnet *ifp;
1367 	int error, found __diagused;
1368  	bool shutdown;
1369 
1370 	/* Try to find the prison within our visibility. */
1371 	sx_slock(&allprison_lock);
1372 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1373 	sx_sunlock(&allprison_lock);
1374 	if (pr == NULL)
1375 		return (ENXIO);
1376 	prison_hold_locked(pr);
1377 	mtx_unlock(&pr->pr_mtx);
1378 
1379 	/* Make sure the named iface exists in the source prison/vnet. */
1380 	CURVNET_SET(pr->pr_vnet);
1381 	ifp = ifunit(ifname);		/* XXX Lock to avoid races. */
1382 	if (ifp == NULL) {
1383 		CURVNET_RESTORE();
1384 		prison_free(pr);
1385 		return (ENXIO);
1386 	}
1387 
1388 	/* Do not try to move the iface from and to the same prison. */
1389 	vnet_dst = TD_TO_VNET(td);
1390 	if (vnet_dst == ifp->if_vnet) {
1391 		CURVNET_RESTORE();
1392 		prison_free(pr);
1393 		return (EEXIST);
1394 	}
1395 
1396 	/* Make sure the VNET is stable. */
1397 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1398 	if (shutdown) {
1399 		CURVNET_RESTORE();
1400 		prison_free(pr);
1401 		return (EBUSY);
1402 	}
1403 
1404 	/* Get interface back from child jail/vnet. */
1405 	found = if_unlink_ifnet(ifp, true);
1406 	MPASS(found);
1407 	sx_xlock(&ifnet_detach_sxlock);
1408 	error = if_vmove(ifp, vnet_dst);
1409 	sx_xunlock(&ifnet_detach_sxlock);
1410 	CURVNET_RESTORE();
1411 
1412 	/* Report the new if_xname back to the userland on success. */
1413 	if (error == 0)
1414 		sprintf(ifname, "%s", ifp->if_xname);
1415 
1416 	prison_free(pr);
1417 	return (error);
1418 }
1419 #endif /* VIMAGE */
1420 
1421 /*
1422  * Add a group to an interface
1423  */
1424 int
1425 if_addgroup(struct ifnet *ifp, const char *groupname)
1426 {
1427 	struct ifg_list		*ifgl;
1428 	struct ifg_group	*ifg = NULL;
1429 	struct ifg_member	*ifgm;
1430 	int 			 new = 0;
1431 
1432 	if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
1433 	    groupname[strlen(groupname) - 1] <= '9')
1434 		return (EINVAL);
1435 
1436 	IFNET_WLOCK();
1437 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1438 		if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1439 			IFNET_WUNLOCK();
1440 			return (EEXIST);
1441 		}
1442 
1443 	if ((ifgl = malloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) {
1444 	    	IFNET_WUNLOCK();
1445 		return (ENOMEM);
1446 	}
1447 
1448 	if ((ifgm = malloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) {
1449 		free(ifgl, M_TEMP);
1450 		IFNET_WUNLOCK();
1451 		return (ENOMEM);
1452 	}
1453 
1454 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1455 		if (!strcmp(ifg->ifg_group, groupname))
1456 			break;
1457 
1458 	if (ifg == NULL) {
1459 		if ((ifg = malloc(sizeof(*ifg), M_TEMP, M_NOWAIT)) == NULL) {
1460 			free(ifgl, M_TEMP);
1461 			free(ifgm, M_TEMP);
1462 			IFNET_WUNLOCK();
1463 			return (ENOMEM);
1464 		}
1465 		strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1466 		ifg->ifg_refcnt = 0;
1467 		CK_STAILQ_INIT(&ifg->ifg_members);
1468 		CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1469 		new = 1;
1470 	}
1471 
1472 	ifg->ifg_refcnt++;
1473 	ifgl->ifgl_group = ifg;
1474 	ifgm->ifgm_ifp = ifp;
1475 
1476 	IF_ADDR_WLOCK(ifp);
1477 	CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1478 	CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1479 	IF_ADDR_WUNLOCK(ifp);
1480 
1481 	IFNET_WUNLOCK();
1482 
1483 	if (new)
1484 		EVENTHANDLER_INVOKE(group_attach_event, ifg);
1485 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1486 
1487 	return (0);
1488 }
1489 
1490 /*
1491  * Helper function to remove a group out of an interface.  Expects the global
1492  * ifnet lock to be write-locked, and drops it before returning.
1493  */
1494 static void
1495 _if_delgroup_locked(struct ifnet *ifp, struct ifg_list *ifgl,
1496     const char *groupname)
1497 {
1498 	struct ifg_member *ifgm;
1499 	bool freeifgl;
1500 
1501 	IFNET_WLOCK_ASSERT();
1502 
1503 	IF_ADDR_WLOCK(ifp);
1504 	CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next);
1505 	IF_ADDR_WUNLOCK(ifp);
1506 
1507 	CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) {
1508 		if (ifgm->ifgm_ifp == ifp) {
1509 			CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1510 			    ifg_member, ifgm_next);
1511 			break;
1512 		}
1513 	}
1514 
1515 	if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1516 		CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group,
1517 		    ifg_next);
1518 		freeifgl = true;
1519 	} else {
1520 		freeifgl = false;
1521 	}
1522 	IFNET_WUNLOCK();
1523 
1524 	NET_EPOCH_WAIT();
1525 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1526 	if (freeifgl) {
1527 		EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1528 		free(ifgl->ifgl_group, M_TEMP);
1529 	}
1530 	free(ifgm, M_TEMP);
1531 	free(ifgl, M_TEMP);
1532 }
1533 
1534 /*
1535  * Remove a group from an interface
1536  */
1537 int
1538 if_delgroup(struct ifnet *ifp, const char *groupname)
1539 {
1540 	struct ifg_list *ifgl;
1541 
1542 	IFNET_WLOCK();
1543 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1544 		if (strcmp(ifgl->ifgl_group->ifg_group, groupname) == 0)
1545 			break;
1546 	if (ifgl == NULL) {
1547 		IFNET_WUNLOCK();
1548 		return (ENOENT);
1549 	}
1550 
1551 	_if_delgroup_locked(ifp, ifgl, groupname);
1552 
1553 	return (0);
1554 }
1555 
1556 /*
1557  * Remove an interface from all groups
1558  */
1559 static void
1560 if_delgroups(struct ifnet *ifp)
1561 {
1562 	struct ifg_list *ifgl;
1563 	char groupname[IFNAMSIZ];
1564 
1565 	IFNET_WLOCK();
1566 	while ((ifgl = CK_STAILQ_FIRST(&ifp->if_groups)) != NULL) {
1567 		strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1568 		_if_delgroup_locked(ifp, ifgl, groupname);
1569 		IFNET_WLOCK();
1570 	}
1571 	IFNET_WUNLOCK();
1572 }
1573 
1574 /*
1575  * Stores all groups from an interface in memory pointed to by ifgr.
1576  */
1577 static int
1578 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp)
1579 {
1580 	int			 len, error;
1581 	struct ifg_list		*ifgl;
1582 	struct ifg_req		 ifgrq, *ifgp;
1583 
1584 	NET_EPOCH_ASSERT();
1585 
1586 	if (ifgr->ifgr_len == 0) {
1587 		CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1588 			ifgr->ifgr_len += sizeof(struct ifg_req);
1589 		return (0);
1590 	}
1591 
1592 	len = ifgr->ifgr_len;
1593 	ifgp = ifgr->ifgr_groups;
1594 	/* XXX: wire */
1595 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1596 		if (len < sizeof(ifgrq))
1597 			return (EINVAL);
1598 		bzero(&ifgrq, sizeof ifgrq);
1599 		strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1600 		    sizeof(ifgrq.ifgrq_group));
1601 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req))))
1602 			return (error);
1603 		len -= sizeof(ifgrq);
1604 		ifgp++;
1605 	}
1606 
1607 	return (0);
1608 }
1609 
1610 /*
1611  * Stores all members of a group in memory pointed to by igfr
1612  */
1613 static int
1614 if_getgroupmembers(struct ifgroupreq *ifgr)
1615 {
1616 	struct ifg_group	*ifg;
1617 	struct ifg_member	*ifgm;
1618 	struct ifg_req		 ifgrq, *ifgp;
1619 	int			 len, error;
1620 
1621 	IFNET_RLOCK();
1622 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1623 		if (strcmp(ifg->ifg_group, ifgr->ifgr_name) == 0)
1624 			break;
1625 	if (ifg == NULL) {
1626 		IFNET_RUNLOCK();
1627 		return (ENOENT);
1628 	}
1629 
1630 	if (ifgr->ifgr_len == 0) {
1631 		CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1632 			ifgr->ifgr_len += sizeof(ifgrq);
1633 		IFNET_RUNLOCK();
1634 		return (0);
1635 	}
1636 
1637 	len = ifgr->ifgr_len;
1638 	ifgp = ifgr->ifgr_groups;
1639 	CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1640 		if (len < sizeof(ifgrq)) {
1641 			IFNET_RUNLOCK();
1642 			return (EINVAL);
1643 		}
1644 		bzero(&ifgrq, sizeof ifgrq);
1645 		strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1646 		    sizeof(ifgrq.ifgrq_member));
1647 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1648 			IFNET_RUNLOCK();
1649 			return (error);
1650 		}
1651 		len -= sizeof(ifgrq);
1652 		ifgp++;
1653 	}
1654 	IFNET_RUNLOCK();
1655 
1656 	return (0);
1657 }
1658 
1659 /*
1660  * Return counter values from counter(9)s stored in ifnet.
1661  */
1662 uint64_t
1663 if_get_counter_default(struct ifnet *ifp, ift_counter cnt)
1664 {
1665 
1666 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1667 
1668 	return (counter_u64_fetch(ifp->if_counters[cnt]));
1669 }
1670 
1671 /*
1672  * Increase an ifnet counter. Usually used for counters shared
1673  * between the stack and a driver, but function supports them all.
1674  */
1675 void
1676 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc)
1677 {
1678 
1679 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1680 
1681 	counter_u64_add(ifp->if_counters[cnt], inc);
1682 }
1683 
1684 /*
1685  * Copy data from ifnet to userland API structure if_data.
1686  */
1687 void
1688 if_data_copy(struct ifnet *ifp, struct if_data *ifd)
1689 {
1690 
1691 	ifd->ifi_type = ifp->if_type;
1692 	ifd->ifi_physical = 0;
1693 	ifd->ifi_addrlen = ifp->if_addrlen;
1694 	ifd->ifi_hdrlen = ifp->if_hdrlen;
1695 	ifd->ifi_link_state = ifp->if_link_state;
1696 	ifd->ifi_vhid = 0;
1697 	ifd->ifi_datalen = sizeof(struct if_data);
1698 	ifd->ifi_mtu = ifp->if_mtu;
1699 	ifd->ifi_metric = ifp->if_metric;
1700 	ifd->ifi_baudrate = ifp->if_baudrate;
1701 	ifd->ifi_hwassist = ifp->if_hwassist;
1702 	ifd->ifi_epoch = ifp->if_epoch;
1703 	ifd->ifi_lastchange = ifp->if_lastchange;
1704 
1705 	ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS);
1706 	ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS);
1707 	ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS);
1708 	ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS);
1709 	ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS);
1710 	ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES);
1711 	ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES);
1712 	ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS);
1713 	ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS);
1714 	ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS);
1715 	ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
1716 	ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO);
1717 }
1718 
1719 /*
1720  * Initialization, destruction and refcounting functions for ifaddrs.
1721  */
1722 struct ifaddr *
1723 ifa_alloc(size_t size, int flags)
1724 {
1725 	struct ifaddr *ifa;
1726 
1727 	KASSERT(size >= sizeof(struct ifaddr),
1728 	    ("%s: invalid size %zu", __func__, size));
1729 
1730 	ifa = malloc(size, M_IFADDR, M_ZERO | flags);
1731 	if (ifa == NULL)
1732 		return (NULL);
1733 
1734 	if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL)
1735 		goto fail;
1736 	if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL)
1737 		goto fail;
1738 	if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL)
1739 		goto fail;
1740 	if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL)
1741 		goto fail;
1742 
1743 	refcount_init(&ifa->ifa_refcnt, 1);
1744 
1745 	return (ifa);
1746 
1747 fail:
1748 	/* free(NULL) is okay */
1749 	counter_u64_free(ifa->ifa_opackets);
1750 	counter_u64_free(ifa->ifa_ipackets);
1751 	counter_u64_free(ifa->ifa_obytes);
1752 	counter_u64_free(ifa->ifa_ibytes);
1753 	free(ifa, M_IFADDR);
1754 
1755 	return (NULL);
1756 }
1757 
1758 void
1759 ifa_ref(struct ifaddr *ifa)
1760 {
1761 	u_int old __diagused;
1762 
1763 	old = refcount_acquire(&ifa->ifa_refcnt);
1764 	KASSERT(old > 0, ("%s: ifa %p has 0 refs", __func__, ifa));
1765 }
1766 
1767 int
1768 ifa_try_ref(struct ifaddr *ifa)
1769 {
1770 
1771 	NET_EPOCH_ASSERT();
1772 	return (refcount_acquire_if_not_zero(&ifa->ifa_refcnt));
1773 }
1774 
1775 static void
1776 ifa_destroy(epoch_context_t ctx)
1777 {
1778 	struct ifaddr *ifa;
1779 
1780 	ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx);
1781 	counter_u64_free(ifa->ifa_opackets);
1782 	counter_u64_free(ifa->ifa_ipackets);
1783 	counter_u64_free(ifa->ifa_obytes);
1784 	counter_u64_free(ifa->ifa_ibytes);
1785 	free(ifa, M_IFADDR);
1786 }
1787 
1788 void
1789 ifa_free(struct ifaddr *ifa)
1790 {
1791 
1792 	if (refcount_release(&ifa->ifa_refcnt))
1793 		NET_EPOCH_CALL(ifa_destroy, &ifa->ifa_epoch_ctx);
1794 }
1795 
1796 /*
1797  * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1798  * structs used to represent other address families, it is necessary
1799  * to perform a different comparison.
1800  */
1801 
1802 #define	sa_dl_equal(a1, a2)	\
1803 	((((const struct sockaddr_dl *)(a1))->sdl_len ==		\
1804 	 ((const struct sockaddr_dl *)(a2))->sdl_len) &&		\
1805 	 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)),		\
1806 	       CLLADDR((const struct sockaddr_dl *)(a2)),		\
1807 	       ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1808 
1809 /*
1810  * Locate an interface based on a complete address.
1811  */
1812 /*ARGSUSED*/
1813 struct ifaddr *
1814 ifa_ifwithaddr(const struct sockaddr *addr)
1815 {
1816 	struct ifnet *ifp;
1817 	struct ifaddr *ifa;
1818 
1819 	NET_EPOCH_ASSERT();
1820 
1821 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1822 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1823 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1824 				continue;
1825 			if (sa_equal(addr, ifa->ifa_addr)) {
1826 				goto done;
1827 			}
1828 			/* IP6 doesn't have broadcast */
1829 			if ((ifp->if_flags & IFF_BROADCAST) &&
1830 			    ifa->ifa_broadaddr &&
1831 			    ifa->ifa_broadaddr->sa_len != 0 &&
1832 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1833 				goto done;
1834 			}
1835 		}
1836 	}
1837 	ifa = NULL;
1838 done:
1839 	return (ifa);
1840 }
1841 
1842 int
1843 ifa_ifwithaddr_check(const struct sockaddr *addr)
1844 {
1845 	struct epoch_tracker et;
1846 	int rc;
1847 
1848 	NET_EPOCH_ENTER(et);
1849 	rc = (ifa_ifwithaddr(addr) != NULL);
1850 	NET_EPOCH_EXIT(et);
1851 	return (rc);
1852 }
1853 
1854 /*
1855  * Locate an interface based on the broadcast address.
1856  */
1857 /* ARGSUSED */
1858 struct ifaddr *
1859 ifa_ifwithbroadaddr(const struct sockaddr *addr, int fibnum)
1860 {
1861 	struct ifnet *ifp;
1862 	struct ifaddr *ifa;
1863 
1864 	NET_EPOCH_ASSERT();
1865 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1866 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1867 			continue;
1868 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1869 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1870 				continue;
1871 			if ((ifp->if_flags & IFF_BROADCAST) &&
1872 			    ifa->ifa_broadaddr &&
1873 			    ifa->ifa_broadaddr->sa_len != 0 &&
1874 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1875 				goto done;
1876 			}
1877 		}
1878 	}
1879 	ifa = NULL;
1880 done:
1881 	return (ifa);
1882 }
1883 
1884 /*
1885  * Locate the point to point interface with a given destination address.
1886  */
1887 /*ARGSUSED*/
1888 struct ifaddr *
1889 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum)
1890 {
1891 	struct ifnet *ifp;
1892 	struct ifaddr *ifa;
1893 
1894 	NET_EPOCH_ASSERT();
1895 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1896 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1897 			continue;
1898 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1899 			continue;
1900 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1901 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1902 				continue;
1903 			if (ifa->ifa_dstaddr != NULL &&
1904 			    sa_equal(addr, ifa->ifa_dstaddr)) {
1905 				goto done;
1906 			}
1907 		}
1908 	}
1909 	ifa = NULL;
1910 done:
1911 	return (ifa);
1912 }
1913 
1914 /*
1915  * Find an interface on a specific network.  If many, choice
1916  * is most specific found.
1917  */
1918 struct ifaddr *
1919 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum)
1920 {
1921 	struct ifnet *ifp;
1922 	struct ifaddr *ifa;
1923 	struct ifaddr *ifa_maybe = NULL;
1924 	u_int af = addr->sa_family;
1925 	const char *addr_data = addr->sa_data, *cplim;
1926 
1927 	NET_EPOCH_ASSERT();
1928 	/*
1929 	 * AF_LINK addresses can be looked up directly by their index number,
1930 	 * so do that if we can.
1931 	 */
1932 	if (af == AF_LINK) {
1933 		ifp = ifnet_byindex(
1934 		    ((const struct sockaddr_dl *)addr)->sdl_index);
1935 		return (ifp ? ifp->if_addr : NULL);
1936 	}
1937 
1938 	/*
1939 	 * Scan though each interface, looking for ones that have addresses
1940 	 * in this address family and the requested fib.
1941 	 */
1942 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1943 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1944 			continue;
1945 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1946 			const char *cp, *cp2, *cp3;
1947 
1948 			if (ifa->ifa_addr->sa_family != af)
1949 next:				continue;
1950 			if (af == AF_INET &&
1951 			    ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1952 				/*
1953 				 * This is a bit broken as it doesn't
1954 				 * take into account that the remote end may
1955 				 * be a single node in the network we are
1956 				 * looking for.
1957 				 * The trouble is that we don't know the
1958 				 * netmask for the remote end.
1959 				 */
1960 				if (ifa->ifa_dstaddr != NULL &&
1961 				    sa_equal(addr, ifa->ifa_dstaddr)) {
1962 					goto done;
1963 				}
1964 			} else {
1965 				/*
1966 				 * Scan all the bits in the ifa's address.
1967 				 * If a bit dissagrees with what we are
1968 				 * looking for, mask it with the netmask
1969 				 * to see if it really matters.
1970 				 * (A byte at a time)
1971 				 */
1972 				if (ifa->ifa_netmask == 0)
1973 					continue;
1974 				cp = addr_data;
1975 				cp2 = ifa->ifa_addr->sa_data;
1976 				cp3 = ifa->ifa_netmask->sa_data;
1977 				cplim = ifa->ifa_netmask->sa_len
1978 					+ (char *)ifa->ifa_netmask;
1979 				while (cp3 < cplim)
1980 					if ((*cp++ ^ *cp2++) & *cp3++)
1981 						goto next; /* next address! */
1982 				/*
1983 				 * If the netmask of what we just found
1984 				 * is more specific than what we had before
1985 				 * (if we had one), or if the virtual status
1986 				 * of new prefix is better than of the old one,
1987 				 * then remember the new one before continuing
1988 				 * to search for an even better one.
1989 				 */
1990 				if (ifa_maybe == NULL ||
1991 				    ifa_preferred(ifa_maybe, ifa) ||
1992 				    rn_refines((caddr_t)ifa->ifa_netmask,
1993 				    (caddr_t)ifa_maybe->ifa_netmask)) {
1994 					ifa_maybe = ifa;
1995 				}
1996 			}
1997 		}
1998 	}
1999 	ifa = ifa_maybe;
2000 	ifa_maybe = NULL;
2001 done:
2002 	return (ifa);
2003 }
2004 
2005 /*
2006  * Find an interface address specific to an interface best matching
2007  * a given address.
2008  */
2009 struct ifaddr *
2010 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp)
2011 {
2012 	struct ifaddr *ifa;
2013 	const char *cp, *cp2, *cp3;
2014 	char *cplim;
2015 	struct ifaddr *ifa_maybe = NULL;
2016 	u_int af = addr->sa_family;
2017 
2018 	if (af >= AF_MAX)
2019 		return (NULL);
2020 
2021 	NET_EPOCH_ASSERT();
2022 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2023 		if (ifa->ifa_addr->sa_family != af)
2024 			continue;
2025 		if (ifa_maybe == NULL)
2026 			ifa_maybe = ifa;
2027 		if (ifa->ifa_netmask == 0) {
2028 			if (sa_equal(addr, ifa->ifa_addr) ||
2029 			    (ifa->ifa_dstaddr &&
2030 			    sa_equal(addr, ifa->ifa_dstaddr)))
2031 				goto done;
2032 			continue;
2033 		}
2034 		if (ifp->if_flags & IFF_POINTOPOINT) {
2035 			if (ifa->ifa_dstaddr && sa_equal(addr, ifa->ifa_dstaddr))
2036 				goto done;
2037 		} else {
2038 			cp = addr->sa_data;
2039 			cp2 = ifa->ifa_addr->sa_data;
2040 			cp3 = ifa->ifa_netmask->sa_data;
2041 			cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
2042 			for (; cp3 < cplim; cp3++)
2043 				if ((*cp++ ^ *cp2++) & *cp3)
2044 					break;
2045 			if (cp3 == cplim)
2046 				goto done;
2047 		}
2048 	}
2049 	ifa = ifa_maybe;
2050 done:
2051 	return (ifa);
2052 }
2053 
2054 /*
2055  * See whether new ifa is better than current one:
2056  * 1) A non-virtual one is preferred over virtual.
2057  * 2) A virtual in master state preferred over any other state.
2058  *
2059  * Used in several address selecting functions.
2060  */
2061 int
2062 ifa_preferred(struct ifaddr *cur, struct ifaddr *next)
2063 {
2064 
2065 	return (cur->ifa_carp && (!next->ifa_carp ||
2066 	    ((*carp_master_p)(next) && !(*carp_master_p)(cur))));
2067 }
2068 
2069 struct sockaddr_dl *
2070 link_alloc_sdl(size_t size, int flags)
2071 {
2072 
2073 	return (malloc(size, M_TEMP, flags));
2074 }
2075 
2076 void
2077 link_free_sdl(struct sockaddr *sa)
2078 {
2079 	free(sa, M_TEMP);
2080 }
2081 
2082 /*
2083  * Fills in given sdl with interface basic info.
2084  * Returns pointer to filled sdl.
2085  */
2086 struct sockaddr_dl *
2087 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype)
2088 {
2089 	struct sockaddr_dl *sdl;
2090 
2091 	sdl = (struct sockaddr_dl *)paddr;
2092 	memset(sdl, 0, sizeof(struct sockaddr_dl));
2093 	sdl->sdl_len = sizeof(struct sockaddr_dl);
2094 	sdl->sdl_family = AF_LINK;
2095 	sdl->sdl_index = ifp->if_index;
2096 	sdl->sdl_type = iftype;
2097 
2098 	return (sdl);
2099 }
2100 
2101 /*
2102  * Mark an interface down and notify protocols of
2103  * the transition.
2104  */
2105 static void
2106 if_unroute(struct ifnet *ifp, int flag, int fam)
2107 {
2108 
2109 	KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
2110 
2111 	ifp->if_flags &= ~flag;
2112 	getmicrotime(&ifp->if_lastchange);
2113 	ifp->if_qflush(ifp);
2114 
2115 	if (ifp->if_carp)
2116 		(*carp_linkstate_p)(ifp);
2117 	rt_ifmsg(ifp, IFF_UP);
2118 }
2119 
2120 void	(*vlan_link_state_p)(struct ifnet *);	/* XXX: private from if_vlan */
2121 void	(*vlan_trunk_cap_p)(struct ifnet *);		/* XXX: private from if_vlan */
2122 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
2123 struct	ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
2124 int	(*vlan_tag_p)(struct ifnet *, uint16_t *);
2125 int	(*vlan_pcp_p)(struct ifnet *, uint16_t *);
2126 int	(*vlan_setcookie_p)(struct ifnet *, void *);
2127 void	*(*vlan_cookie_p)(struct ifnet *);
2128 
2129 /*
2130  * Handle a change in the interface link state. To avoid LORs
2131  * between driver lock and upper layer locks, as well as possible
2132  * recursions, we post event to taskqueue, and all job
2133  * is done in static do_link_state_change().
2134  */
2135 void
2136 if_link_state_change(struct ifnet *ifp, int link_state)
2137 {
2138 	/* Return if state hasn't changed. */
2139 	if (ifp->if_link_state == link_state)
2140 		return;
2141 
2142 	ifp->if_link_state = link_state;
2143 
2144 	/* XXXGL: reference ifp? */
2145 	taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
2146 }
2147 
2148 static void
2149 do_link_state_change(void *arg, int pending)
2150 {
2151 	struct ifnet *ifp;
2152 	int link_state;
2153 
2154 	ifp = arg;
2155 	link_state = ifp->if_link_state;
2156 
2157 	CURVNET_SET(ifp->if_vnet);
2158 	rt_ifmsg(ifp, 0);
2159 	if (ifp->if_vlantrunk != NULL)
2160 		(*vlan_link_state_p)(ifp);
2161 
2162 	if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
2163 	    ifp->if_l2com != NULL)
2164 		(*ng_ether_link_state_p)(ifp, link_state);
2165 	if (ifp->if_carp)
2166 		(*carp_linkstate_p)(ifp);
2167 	if (ifp->if_bridge)
2168 		ifp->if_bridge_linkstate(ifp);
2169 	if (ifp->if_lagg)
2170 		(*lagg_linkstate_p)(ifp, link_state);
2171 
2172 	if (IS_DEFAULT_VNET(curvnet))
2173 		devctl_notify("IFNET", ifp->if_xname,
2174 		    (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
2175 		    NULL);
2176 	if (pending > 1)
2177 		if_printf(ifp, "%d link states coalesced\n", pending);
2178 	if (log_link_state_change)
2179 		if_printf(ifp, "link state changed to %s\n",
2180 		    (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
2181 	EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state);
2182 	CURVNET_RESTORE();
2183 }
2184 
2185 /*
2186  * Mark an interface down and notify protocols of
2187  * the transition.
2188  */
2189 void
2190 if_down(struct ifnet *ifp)
2191 {
2192 
2193 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
2194 	if_unroute(ifp, IFF_UP, AF_UNSPEC);
2195 }
2196 
2197 /*
2198  * Mark an interface up and notify protocols of
2199  * the transition.
2200  */
2201 void
2202 if_up(struct ifnet *ifp)
2203 {
2204 
2205 	ifp->if_flags |= IFF_UP;
2206 	getmicrotime(&ifp->if_lastchange);
2207 	if (ifp->if_carp)
2208 		(*carp_linkstate_p)(ifp);
2209 	rt_ifmsg(ifp, IFF_UP);
2210 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
2211 }
2212 
2213 /*
2214  * Flush an interface queue.
2215  */
2216 void
2217 if_qflush(struct ifnet *ifp)
2218 {
2219 	struct mbuf *m, *n;
2220 	struct ifaltq *ifq;
2221 
2222 	ifq = &ifp->if_snd;
2223 	IFQ_LOCK(ifq);
2224 #ifdef ALTQ
2225 	if (ALTQ_IS_ENABLED(ifq))
2226 		ALTQ_PURGE(ifq);
2227 #endif
2228 	n = ifq->ifq_head;
2229 	while ((m = n) != NULL) {
2230 		n = m->m_nextpkt;
2231 		m_freem(m);
2232 	}
2233 	ifq->ifq_head = 0;
2234 	ifq->ifq_tail = 0;
2235 	ifq->ifq_len = 0;
2236 	IFQ_UNLOCK(ifq);
2237 }
2238 
2239 /*
2240  * Map interface name to interface structure pointer, with or without
2241  * returning a reference.
2242  */
2243 struct ifnet *
2244 ifunit_ref(const char *name)
2245 {
2246 	struct epoch_tracker et;
2247 	struct ifnet *ifp;
2248 
2249 	NET_EPOCH_ENTER(et);
2250 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2251 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2252 		    !(ifp->if_flags & IFF_DYING))
2253 			break;
2254 	}
2255 	if (ifp != NULL) {
2256 		if_ref(ifp);
2257 		MPASS(ifindex_table[ifp->if_index].ife_ifnet == ifp);
2258 	}
2259 
2260 	NET_EPOCH_EXIT(et);
2261 	return (ifp);
2262 }
2263 
2264 struct ifnet *
2265 ifunit(const char *name)
2266 {
2267 	struct epoch_tracker et;
2268 	struct ifnet *ifp;
2269 
2270 	NET_EPOCH_ENTER(et);
2271 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2272 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2273 			break;
2274 	}
2275 	NET_EPOCH_EXIT(et);
2276 	return (ifp);
2277 }
2278 
2279 void *
2280 ifr_buffer_get_buffer(void *data)
2281 {
2282 	union ifreq_union *ifrup;
2283 
2284 	ifrup = data;
2285 #ifdef COMPAT_FREEBSD32
2286 	if (SV_CURPROC_FLAG(SV_ILP32))
2287 		return ((void *)(uintptr_t)
2288 		    ifrup->ifr32.ifr_ifru.ifru_buffer.buffer);
2289 #endif
2290 	return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer);
2291 }
2292 
2293 static void
2294 ifr_buffer_set_buffer_null(void *data)
2295 {
2296 	union ifreq_union *ifrup;
2297 
2298 	ifrup = data;
2299 #ifdef COMPAT_FREEBSD32
2300 	if (SV_CURPROC_FLAG(SV_ILP32))
2301 		ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0;
2302 	else
2303 #endif
2304 		ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL;
2305 }
2306 
2307 size_t
2308 ifr_buffer_get_length(void *data)
2309 {
2310 	union ifreq_union *ifrup;
2311 
2312 	ifrup = data;
2313 #ifdef COMPAT_FREEBSD32
2314 	if (SV_CURPROC_FLAG(SV_ILP32))
2315 		return (ifrup->ifr32.ifr_ifru.ifru_buffer.length);
2316 #endif
2317 	return (ifrup->ifr.ifr_ifru.ifru_buffer.length);
2318 }
2319 
2320 static void
2321 ifr_buffer_set_length(void *data, size_t len)
2322 {
2323 	union ifreq_union *ifrup;
2324 
2325 	ifrup = data;
2326 #ifdef COMPAT_FREEBSD32
2327 	if (SV_CURPROC_FLAG(SV_ILP32))
2328 		ifrup->ifr32.ifr_ifru.ifru_buffer.length = len;
2329 	else
2330 #endif
2331 		ifrup->ifr.ifr_ifru.ifru_buffer.length = len;
2332 }
2333 
2334 void *
2335 ifr_data_get_ptr(void *ifrp)
2336 {
2337 	union ifreq_union *ifrup;
2338 
2339 	ifrup = ifrp;
2340 #ifdef COMPAT_FREEBSD32
2341 	if (SV_CURPROC_FLAG(SV_ILP32))
2342 		return ((void *)(uintptr_t)
2343 		    ifrup->ifr32.ifr_ifru.ifru_data);
2344 #endif
2345 		return (ifrup->ifr.ifr_ifru.ifru_data);
2346 }
2347 
2348 struct ifcap_nv_bit_name {
2349 	uint64_t cap_bit;
2350 	const char *cap_name;
2351 };
2352 #define CAPNV(x) {.cap_bit = IFCAP_##x, \
2353     .cap_name = __CONCAT(IFCAP_, __CONCAT(x, _NAME)) }
2354 const struct ifcap_nv_bit_name ifcap_nv_bit_names[] = {
2355 	CAPNV(RXCSUM),
2356 	CAPNV(TXCSUM),
2357 	CAPNV(NETCONS),
2358 	CAPNV(VLAN_MTU),
2359 	CAPNV(VLAN_HWTAGGING),
2360 	CAPNV(JUMBO_MTU),
2361 	CAPNV(POLLING),
2362 	CAPNV(VLAN_HWCSUM),
2363 	CAPNV(TSO4),
2364 	CAPNV(TSO6),
2365 	CAPNV(LRO),
2366 	CAPNV(WOL_UCAST),
2367 	CAPNV(WOL_MCAST),
2368 	CAPNV(WOL_MAGIC),
2369 	CAPNV(TOE4),
2370 	CAPNV(TOE6),
2371 	CAPNV(VLAN_HWFILTER),
2372 	CAPNV(VLAN_HWTSO),
2373 	CAPNV(LINKSTATE),
2374 	CAPNV(NETMAP),
2375 	CAPNV(RXCSUM_IPV6),
2376 	CAPNV(TXCSUM_IPV6),
2377 	CAPNV(HWSTATS),
2378 	CAPNV(TXRTLMT),
2379 	CAPNV(HWRXTSTMP),
2380 	CAPNV(MEXTPG),
2381 	CAPNV(TXTLS4),
2382 	CAPNV(TXTLS6),
2383 	CAPNV(VXLAN_HWCSUM),
2384 	CAPNV(VXLAN_HWTSO),
2385 	CAPNV(TXTLS_RTLMT),
2386 	{0, NULL}
2387 };
2388 #define CAP2NV(x) {.cap_bit = IFCAP2_BIT(IFCAP2_##x), \
2389     .cap_name = __CONCAT(IFCAP2_, __CONCAT(x, _NAME)) }
2390 const struct ifcap_nv_bit_name ifcap2_nv_bit_names[] = {
2391 	CAP2NV(RXTLS4),
2392 	CAP2NV(RXTLS6),
2393 	CAP2NV(IPSEC_OFFLOAD),
2394 	{0, NULL}
2395 };
2396 #undef CAPNV
2397 #undef CAP2NV
2398 
2399 int
2400 if_capnv_to_capint(const nvlist_t *nv, int *old_cap,
2401     const struct ifcap_nv_bit_name *nn, bool all)
2402 {
2403 	int i, res;
2404 
2405 	res = 0;
2406 	for (i = 0; nn[i].cap_name != NULL; i++) {
2407 		if (nvlist_exists_bool(nv, nn[i].cap_name)) {
2408 			if (all || nvlist_get_bool(nv, nn[i].cap_name))
2409 				res |= nn[i].cap_bit;
2410 		} else {
2411 			res |= *old_cap & nn[i].cap_bit;
2412 		}
2413 	}
2414 	return (res);
2415 }
2416 
2417 void
2418 if_capint_to_capnv(nvlist_t *nv, const struct ifcap_nv_bit_name *nn,
2419     int ifr_cap, int ifr_req)
2420 {
2421 	int i;
2422 
2423 	for (i = 0; nn[i].cap_name != NULL; i++) {
2424 		if ((nn[i].cap_bit & ifr_cap) != 0) {
2425 			nvlist_add_bool(nv, nn[i].cap_name,
2426 			    (nn[i].cap_bit & ifr_req) != 0);
2427 		}
2428 	}
2429 }
2430 
2431 /*
2432  * Hardware specific interface ioctls.
2433  */
2434 int
2435 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2436 {
2437 	struct ifreq *ifr;
2438 	int error = 0, do_ifup = 0;
2439 	int new_flags, temp_flags;
2440 	size_t descrlen, nvbuflen;
2441 	char *descrbuf;
2442 	char new_name[IFNAMSIZ];
2443 	void *buf;
2444 	nvlist_t *nvcap;
2445 	struct siocsifcapnv_driver_data drv_ioctl_data;
2446 
2447 	ifr = (struct ifreq *)data;
2448 	switch (cmd) {
2449 	case SIOCGIFINDEX:
2450 		ifr->ifr_index = ifp->if_index;
2451 		break;
2452 
2453 	case SIOCGIFFLAGS:
2454 		temp_flags = ifp->if_flags | ifp->if_drv_flags;
2455 		ifr->ifr_flags = temp_flags & 0xffff;
2456 		ifr->ifr_flagshigh = temp_flags >> 16;
2457 		break;
2458 
2459 	case SIOCGIFCAP:
2460 		ifr->ifr_reqcap = ifp->if_capabilities;
2461 		ifr->ifr_curcap = ifp->if_capenable;
2462 		break;
2463 
2464 	case SIOCGIFCAPNV:
2465 		if ((ifp->if_capabilities & IFCAP_NV) == 0) {
2466 			error = EINVAL;
2467 			break;
2468 		}
2469 		buf = NULL;
2470 		nvcap = nvlist_create(0);
2471 		for (;;) {
2472 			if_capint_to_capnv(nvcap, ifcap_nv_bit_names,
2473 			    ifp->if_capabilities, ifp->if_capenable);
2474 			if_capint_to_capnv(nvcap, ifcap2_nv_bit_names,
2475 			    ifp->if_capabilities2, ifp->if_capenable2);
2476 			error = (*ifp->if_ioctl)(ifp, SIOCGIFCAPNV,
2477 			    __DECONST(caddr_t, nvcap));
2478 			if (error != 0) {
2479 				if_printf(ifp,
2480 			    "SIOCGIFCAPNV driver mistake: nvlist error %d\n",
2481 				    error);
2482 				break;
2483 			}
2484 			buf = nvlist_pack(nvcap, &nvbuflen);
2485 			if (buf == NULL) {
2486 				error = nvlist_error(nvcap);
2487 				if (error == 0)
2488 					error = EDOOFUS;
2489 				break;
2490 			}
2491 			if (nvbuflen > ifr->ifr_cap_nv.buf_length) {
2492 				ifr->ifr_cap_nv.length = nvbuflen;
2493 				ifr->ifr_cap_nv.buffer = NULL;
2494 				error = EFBIG;
2495 				break;
2496 			}
2497 			ifr->ifr_cap_nv.length = nvbuflen;
2498 			error = copyout(buf, ifr->ifr_cap_nv.buffer, nvbuflen);
2499 			break;
2500 		}
2501 		free(buf, M_NVLIST);
2502 		nvlist_destroy(nvcap);
2503 		break;
2504 
2505 	case SIOCGIFDATA:
2506 	{
2507 		struct if_data ifd;
2508 
2509 		/* Ensure uninitialised padding is not leaked. */
2510 		memset(&ifd, 0, sizeof(ifd));
2511 
2512 		if_data_copy(ifp, &ifd);
2513 		error = copyout(&ifd, ifr_data_get_ptr(ifr), sizeof(ifd));
2514 		break;
2515 	}
2516 
2517 #ifdef MAC
2518 	case SIOCGIFMAC:
2519 		error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2520 		break;
2521 #endif
2522 
2523 	case SIOCGIFMETRIC:
2524 		ifr->ifr_metric = ifp->if_metric;
2525 		break;
2526 
2527 	case SIOCGIFMTU:
2528 		ifr->ifr_mtu = ifp->if_mtu;
2529 		break;
2530 
2531 	case SIOCGIFPHYS:
2532 		/* XXXGL: did this ever worked? */
2533 		ifr->ifr_phys = 0;
2534 		break;
2535 
2536 	case SIOCGIFDESCR:
2537 		error = 0;
2538 		sx_slock(&ifdescr_sx);
2539 		if (ifp->if_description == NULL)
2540 			error = ENOMSG;
2541 		else {
2542 			/* space for terminating nul */
2543 			descrlen = strlen(ifp->if_description) + 1;
2544 			if (ifr_buffer_get_length(ifr) < descrlen)
2545 				ifr_buffer_set_buffer_null(ifr);
2546 			else
2547 				error = copyout(ifp->if_description,
2548 				    ifr_buffer_get_buffer(ifr), descrlen);
2549 			ifr_buffer_set_length(ifr, descrlen);
2550 		}
2551 		sx_sunlock(&ifdescr_sx);
2552 		break;
2553 
2554 	case SIOCSIFDESCR:
2555 		error = priv_check(td, PRIV_NET_SETIFDESCR);
2556 		if (error)
2557 			return (error);
2558 
2559 		/*
2560 		 * Copy only (length-1) bytes to make sure that
2561 		 * if_description is always nul terminated.  The
2562 		 * length parameter is supposed to count the
2563 		 * terminating nul in.
2564 		 */
2565 		if (ifr_buffer_get_length(ifr) > ifdescr_maxlen)
2566 			return (ENAMETOOLONG);
2567 		else if (ifr_buffer_get_length(ifr) == 0)
2568 			descrbuf = NULL;
2569 		else {
2570 			descrbuf = if_allocdescr(ifr_buffer_get_length(ifr), M_WAITOK);
2571 			error = copyin(ifr_buffer_get_buffer(ifr), descrbuf,
2572 			    ifr_buffer_get_length(ifr) - 1);
2573 			if (error) {
2574 				if_freedescr(descrbuf);
2575 				break;
2576 			}
2577 		}
2578 
2579 		if_setdescr(ifp, descrbuf);
2580 		getmicrotime(&ifp->if_lastchange);
2581 		break;
2582 
2583 	case SIOCGIFFIB:
2584 		ifr->ifr_fib = ifp->if_fib;
2585 		break;
2586 
2587 	case SIOCSIFFIB:
2588 		error = priv_check(td, PRIV_NET_SETIFFIB);
2589 		if (error)
2590 			return (error);
2591 		if (ifr->ifr_fib >= rt_numfibs)
2592 			return (EINVAL);
2593 
2594 		ifp->if_fib = ifr->ifr_fib;
2595 		break;
2596 
2597 	case SIOCSIFFLAGS:
2598 		error = priv_check(td, PRIV_NET_SETIFFLAGS);
2599 		if (error)
2600 			return (error);
2601 		/*
2602 		 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2603 		 * check, so we don't need special handling here yet.
2604 		 */
2605 		new_flags = (ifr->ifr_flags & 0xffff) |
2606 		    (ifr->ifr_flagshigh << 16);
2607 		if (ifp->if_flags & IFF_UP &&
2608 		    (new_flags & IFF_UP) == 0) {
2609 			if_down(ifp);
2610 		} else if (new_flags & IFF_UP &&
2611 		    (ifp->if_flags & IFF_UP) == 0) {
2612 			do_ifup = 1;
2613 		}
2614 		/* See if permanently promiscuous mode bit is about to flip */
2615 		if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2616 			if (new_flags & IFF_PPROMISC)
2617 				ifp->if_flags |= IFF_PROMISC;
2618 			else if (ifp->if_pcount == 0)
2619 				ifp->if_flags &= ~IFF_PROMISC;
2620 			if (log_promisc_mode_change)
2621                                 if_printf(ifp, "permanently promiscuous mode %s\n",
2622                                     ((new_flags & IFF_PPROMISC) ?
2623                                      "enabled" : "disabled"));
2624 		}
2625 		ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2626 			(new_flags &~ IFF_CANTCHANGE);
2627 		if (ifp->if_ioctl) {
2628 			(void) (*ifp->if_ioctl)(ifp, cmd, data);
2629 		}
2630 		if (do_ifup)
2631 			if_up(ifp);
2632 		getmicrotime(&ifp->if_lastchange);
2633 		break;
2634 
2635 	case SIOCSIFCAP:
2636 		error = priv_check(td, PRIV_NET_SETIFCAP);
2637 		if (error != 0)
2638 			return (error);
2639 		if (ifp->if_ioctl == NULL)
2640 			return (EOPNOTSUPP);
2641 		if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2642 			return (EINVAL);
2643 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2644 		if (error == 0)
2645 			getmicrotime(&ifp->if_lastchange);
2646 		break;
2647 
2648 	case SIOCSIFCAPNV:
2649 		error = priv_check(td, PRIV_NET_SETIFCAP);
2650 		if (error != 0)
2651 			return (error);
2652 		if (ifp->if_ioctl == NULL)
2653 			return (EOPNOTSUPP);
2654 		if ((ifp->if_capabilities & IFCAP_NV) == 0)
2655 			return (EINVAL);
2656 		if (ifr->ifr_cap_nv.length > IFR_CAP_NV_MAXBUFSIZE)
2657 			return (EINVAL);
2658 		nvcap = NULL;
2659 		buf = malloc(ifr->ifr_cap_nv.length, M_TEMP, M_WAITOK);
2660 		for (;;) {
2661 			error = copyin(ifr->ifr_cap_nv.buffer, buf,
2662 			    ifr->ifr_cap_nv.length);
2663 			if (error != 0)
2664 				break;
2665 			nvcap = nvlist_unpack(buf, ifr->ifr_cap_nv.length, 0);
2666 			if (nvcap == NULL) {
2667 				error = EINVAL;
2668 				break;
2669 			}
2670 			drv_ioctl_data.reqcap = if_capnv_to_capint(nvcap,
2671 			    &ifp->if_capenable, ifcap_nv_bit_names, false);
2672 			if ((drv_ioctl_data.reqcap &
2673 			    ~ifp->if_capabilities) != 0) {
2674 				error = EINVAL;
2675 				break;
2676 			}
2677 			drv_ioctl_data.reqcap2 = if_capnv_to_capint(nvcap,
2678 			    &ifp->if_capenable2, ifcap2_nv_bit_names, false);
2679 			if ((drv_ioctl_data.reqcap2 &
2680 			    ~ifp->if_capabilities2) != 0) {
2681 				error = EINVAL;
2682 				break;
2683 			}
2684 			drv_ioctl_data.nvcap = nvcap;
2685 			error = (*ifp->if_ioctl)(ifp, SIOCSIFCAPNV,
2686 			    (caddr_t)&drv_ioctl_data);
2687 			break;
2688 		}
2689 		nvlist_destroy(nvcap);
2690 		free(buf, M_TEMP);
2691 		if (error == 0)
2692 			getmicrotime(&ifp->if_lastchange);
2693 		break;
2694 
2695 #ifdef MAC
2696 	case SIOCSIFMAC:
2697 		error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2698 		break;
2699 #endif
2700 
2701 	case SIOCSIFNAME:
2702 		error = priv_check(td, PRIV_NET_SETIFNAME);
2703 		if (error)
2704 			return (error);
2705 		error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ,
2706 		    NULL);
2707 		if (error != 0)
2708 			return (error);
2709 		error = if_rename(ifp, new_name);
2710 		break;
2711 
2712 #ifdef VIMAGE
2713 	case SIOCSIFVNET:
2714 		error = priv_check(td, PRIV_NET_SETIFVNET);
2715 		if (error)
2716 			return (error);
2717 		error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2718 		break;
2719 #endif
2720 
2721 	case SIOCSIFMETRIC:
2722 		error = priv_check(td, PRIV_NET_SETIFMETRIC);
2723 		if (error)
2724 			return (error);
2725 		ifp->if_metric = ifr->ifr_metric;
2726 		getmicrotime(&ifp->if_lastchange);
2727 		break;
2728 
2729 	case SIOCSIFPHYS:
2730 		error = priv_check(td, PRIV_NET_SETIFPHYS);
2731 		if (error)
2732 			return (error);
2733 		if (ifp->if_ioctl == NULL)
2734 			return (EOPNOTSUPP);
2735 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2736 		if (error == 0)
2737 			getmicrotime(&ifp->if_lastchange);
2738 		break;
2739 
2740 	case SIOCSIFMTU:
2741 	{
2742 		u_long oldmtu = ifp->if_mtu;
2743 
2744 		error = priv_check(td, PRIV_NET_SETIFMTU);
2745 		if (error)
2746 			return (error);
2747 		if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2748 			return (EINVAL);
2749 		if (ifp->if_ioctl == NULL)
2750 			return (EOPNOTSUPP);
2751 		/* Disallow MTU changes on bridge member interfaces. */
2752 		if (ifp->if_bridge)
2753 			return (EOPNOTSUPP);
2754 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2755 		if (error == 0) {
2756 			getmicrotime(&ifp->if_lastchange);
2757 			rt_ifmsg(ifp, 0);
2758 #ifdef INET
2759 			DEBUGNET_NOTIFY_MTU(ifp);
2760 #endif
2761 		}
2762 		/*
2763 		 * If the link MTU changed, do network layer specific procedure.
2764 		 */
2765 		if (ifp->if_mtu != oldmtu)
2766 			if_notifymtu(ifp);
2767 		break;
2768 	}
2769 
2770 	case SIOCADDMULTI:
2771 	case SIOCDELMULTI:
2772 		if (cmd == SIOCADDMULTI)
2773 			error = priv_check(td, PRIV_NET_ADDMULTI);
2774 		else
2775 			error = priv_check(td, PRIV_NET_DELMULTI);
2776 		if (error)
2777 			return (error);
2778 
2779 		/* Don't allow group membership on non-multicast interfaces. */
2780 		if ((ifp->if_flags & IFF_MULTICAST) == 0)
2781 			return (EOPNOTSUPP);
2782 
2783 		/* Don't let users screw up protocols' entries. */
2784 		if (ifr->ifr_addr.sa_family != AF_LINK)
2785 			return (EINVAL);
2786 
2787 		if (cmd == SIOCADDMULTI) {
2788 			struct epoch_tracker et;
2789 			struct ifmultiaddr *ifma;
2790 
2791 			/*
2792 			 * Userland is only permitted to join groups once
2793 			 * via the if_addmulti() KPI, because it cannot hold
2794 			 * struct ifmultiaddr * between calls. It may also
2795 			 * lose a race while we check if the membership
2796 			 * already exists.
2797 			 */
2798 			NET_EPOCH_ENTER(et);
2799 			ifma = if_findmulti(ifp, &ifr->ifr_addr);
2800 			NET_EPOCH_EXIT(et);
2801 			if (ifma != NULL)
2802 				error = EADDRINUSE;
2803 			else
2804 				error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2805 		} else {
2806 			error = if_delmulti(ifp, &ifr->ifr_addr);
2807 		}
2808 		if (error == 0)
2809 			getmicrotime(&ifp->if_lastchange);
2810 		break;
2811 
2812 	case SIOCSIFPHYADDR:
2813 	case SIOCDIFPHYADDR:
2814 #ifdef INET6
2815 	case SIOCSIFPHYADDR_IN6:
2816 #endif
2817 	case SIOCSIFMEDIA:
2818 	case SIOCSIFGENERIC:
2819 		error = priv_check(td, PRIV_NET_HWIOCTL);
2820 		if (error)
2821 			return (error);
2822 		if (ifp->if_ioctl == NULL)
2823 			return (EOPNOTSUPP);
2824 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2825 		if (error == 0)
2826 			getmicrotime(&ifp->if_lastchange);
2827 		break;
2828 
2829 	case SIOCGIFSTATUS:
2830 	case SIOCGIFPSRCADDR:
2831 	case SIOCGIFPDSTADDR:
2832 	case SIOCGIFMEDIA:
2833 	case SIOCGIFXMEDIA:
2834 	case SIOCGIFGENERIC:
2835 	case SIOCGIFRSSKEY:
2836 	case SIOCGIFRSSHASH:
2837 	case SIOCGIFDOWNREASON:
2838 		if (ifp->if_ioctl == NULL)
2839 			return (EOPNOTSUPP);
2840 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2841 		break;
2842 
2843 	case SIOCSIFLLADDR:
2844 		error = priv_check(td, PRIV_NET_SETLLADDR);
2845 		if (error)
2846 			return (error);
2847 		error = if_setlladdr(ifp,
2848 		    ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2849 		break;
2850 
2851 	case SIOCGHWADDR:
2852 		error = if_gethwaddr(ifp, ifr);
2853 		break;
2854 
2855 	case SIOCAIFGROUP:
2856 		error = priv_check(td, PRIV_NET_ADDIFGROUP);
2857 		if (error)
2858 			return (error);
2859 		error = if_addgroup(ifp,
2860 		    ((struct ifgroupreq *)data)->ifgr_group);
2861 		if (error != 0)
2862 			return (error);
2863 		break;
2864 
2865 	case SIOCGIFGROUP:
2866 	{
2867 		struct epoch_tracker et;
2868 
2869 		NET_EPOCH_ENTER(et);
2870 		error = if_getgroup((struct ifgroupreq *)data, ifp);
2871 		NET_EPOCH_EXIT(et);
2872 		break;
2873 	}
2874 
2875 	case SIOCDIFGROUP:
2876 		error = priv_check(td, PRIV_NET_DELIFGROUP);
2877 		if (error)
2878 			return (error);
2879 		error = if_delgroup(ifp,
2880 		    ((struct ifgroupreq *)data)->ifgr_group);
2881 		if (error != 0)
2882 			return (error);
2883 		break;
2884 
2885 	default:
2886 		error = ENOIOCTL;
2887 		break;
2888 	}
2889 	return (error);
2890 }
2891 
2892 /*
2893  * Interface ioctls.
2894  */
2895 int
2896 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2897 {
2898 #ifdef COMPAT_FREEBSD32
2899 	union {
2900 		struct ifconf ifc;
2901 		struct ifdrv ifd;
2902 		struct ifgroupreq ifgr;
2903 		struct ifmediareq ifmr;
2904 	} thunk;
2905 	u_long saved_cmd;
2906 	struct ifconf32 *ifc32;
2907 	struct ifdrv32 *ifd32;
2908 	struct ifgroupreq32 *ifgr32;
2909 	struct ifmediareq32 *ifmr32;
2910 #endif
2911 	struct ifnet *ifp;
2912 	struct ifreq *ifr;
2913 	int error;
2914 	int oif_flags;
2915 #ifdef VIMAGE
2916 	bool shutdown;
2917 #endif
2918 
2919 	CURVNET_SET(so->so_vnet);
2920 #ifdef VIMAGE
2921 	/* Make sure the VNET is stable. */
2922 	shutdown = VNET_IS_SHUTTING_DOWN(so->so_vnet);
2923 	if (shutdown) {
2924 		CURVNET_RESTORE();
2925 		return (EBUSY);
2926 	}
2927 #endif
2928 
2929 #ifdef COMPAT_FREEBSD32
2930 	saved_cmd = cmd;
2931 	switch (cmd) {
2932 	case SIOCGIFCONF32:
2933 		ifc32 = (struct ifconf32 *)data;
2934 		thunk.ifc.ifc_len = ifc32->ifc_len;
2935 		thunk.ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2936 		data = (caddr_t)&thunk.ifc;
2937 		cmd = SIOCGIFCONF;
2938 		break;
2939 	case SIOCGDRVSPEC32:
2940 	case SIOCSDRVSPEC32:
2941 		ifd32 = (struct ifdrv32 *)data;
2942 		memcpy(thunk.ifd.ifd_name, ifd32->ifd_name,
2943 		    sizeof(thunk.ifd.ifd_name));
2944 		thunk.ifd.ifd_cmd = ifd32->ifd_cmd;
2945 		thunk.ifd.ifd_len = ifd32->ifd_len;
2946 		thunk.ifd.ifd_data = PTRIN(ifd32->ifd_data);
2947 		data = (caddr_t)&thunk.ifd;
2948 		cmd = _IOC_NEWTYPE(cmd, struct ifdrv);
2949 		break;
2950 	case SIOCAIFGROUP32:
2951 	case SIOCGIFGROUP32:
2952 	case SIOCDIFGROUP32:
2953 	case SIOCGIFGMEMB32:
2954 		ifgr32 = (struct ifgroupreq32 *)data;
2955 		memcpy(thunk.ifgr.ifgr_name, ifgr32->ifgr_name,
2956 		    sizeof(thunk.ifgr.ifgr_name));
2957 		thunk.ifgr.ifgr_len = ifgr32->ifgr_len;
2958 		switch (cmd) {
2959 		case SIOCAIFGROUP32:
2960 		case SIOCDIFGROUP32:
2961 			memcpy(thunk.ifgr.ifgr_group, ifgr32->ifgr_group,
2962 			    sizeof(thunk.ifgr.ifgr_group));
2963 			break;
2964 		case SIOCGIFGROUP32:
2965 		case SIOCGIFGMEMB32:
2966 			thunk.ifgr.ifgr_groups = PTRIN(ifgr32->ifgr_groups);
2967 			break;
2968 		}
2969 		data = (caddr_t)&thunk.ifgr;
2970 		cmd = _IOC_NEWTYPE(cmd, struct ifgroupreq);
2971 		break;
2972 	case SIOCGIFMEDIA32:
2973 	case SIOCGIFXMEDIA32:
2974 		ifmr32 = (struct ifmediareq32 *)data;
2975 		memcpy(thunk.ifmr.ifm_name, ifmr32->ifm_name,
2976 		    sizeof(thunk.ifmr.ifm_name));
2977 		thunk.ifmr.ifm_current = ifmr32->ifm_current;
2978 		thunk.ifmr.ifm_mask = ifmr32->ifm_mask;
2979 		thunk.ifmr.ifm_status = ifmr32->ifm_status;
2980 		thunk.ifmr.ifm_active = ifmr32->ifm_active;
2981 		thunk.ifmr.ifm_count = ifmr32->ifm_count;
2982 		thunk.ifmr.ifm_ulist = PTRIN(ifmr32->ifm_ulist);
2983 		data = (caddr_t)&thunk.ifmr;
2984 		cmd = _IOC_NEWTYPE(cmd, struct ifmediareq);
2985 		break;
2986 	}
2987 #endif
2988 
2989 	switch (cmd) {
2990 	case SIOCGIFCONF:
2991 		error = ifconf(cmd, data);
2992 		goto out_noref;
2993 	}
2994 
2995 	ifr = (struct ifreq *)data;
2996 	switch (cmd) {
2997 #ifdef VIMAGE
2998 	case SIOCSIFRVNET:
2999 		error = priv_check(td, PRIV_NET_SETIFVNET);
3000 		if (error == 0)
3001 			error = if_vmove_reclaim(td, ifr->ifr_name,
3002 			    ifr->ifr_jid);
3003 		goto out_noref;
3004 #endif
3005 	case SIOCIFCREATE:
3006 	case SIOCIFCREATE2:
3007 		error = priv_check(td, PRIV_NET_IFCREATE);
3008 		if (error == 0)
3009 			error = if_clone_create(ifr->ifr_name,
3010 			    sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ?
3011 			    ifr_data_get_ptr(ifr) : NULL);
3012 		goto out_noref;
3013 	case SIOCIFDESTROY:
3014 		error = priv_check(td, PRIV_NET_IFDESTROY);
3015 
3016 		if (error == 0) {
3017 			sx_xlock(&ifnet_detach_sxlock);
3018 			error = if_clone_destroy(ifr->ifr_name);
3019 			sx_xunlock(&ifnet_detach_sxlock);
3020 		}
3021 		goto out_noref;
3022 
3023 	case SIOCIFGCLONERS:
3024 		error = if_clone_list((struct if_clonereq *)data);
3025 		goto out_noref;
3026 
3027 	case SIOCGIFGMEMB:
3028 		error = if_getgroupmembers((struct ifgroupreq *)data);
3029 		goto out_noref;
3030 
3031 #if defined(INET) || defined(INET6)
3032 	case SIOCSVH:
3033 	case SIOCGVH:
3034 		if (carp_ioctl_p == NULL)
3035 			error = EPROTONOSUPPORT;
3036 		else
3037 			error = (*carp_ioctl_p)(ifr, cmd, td);
3038 		goto out_noref;
3039 #endif
3040 	}
3041 
3042 	ifp = ifunit_ref(ifr->ifr_name);
3043 	if (ifp == NULL) {
3044 		error = ENXIO;
3045 		goto out_noref;
3046 	}
3047 
3048 	error = ifhwioctl(cmd, ifp, data, td);
3049 	if (error != ENOIOCTL)
3050 		goto out_ref;
3051 
3052 	oif_flags = ifp->if_flags;
3053 	if (so->so_proto == NULL) {
3054 		error = EOPNOTSUPP;
3055 		goto out_ref;
3056 	}
3057 
3058 	/*
3059 	 * Pass the request on to the socket control method, and if the
3060 	 * latter returns EOPNOTSUPP, directly to the interface.
3061 	 *
3062 	 * Make an exception for the legacy SIOCSIF* requests.  Drivers
3063 	 * trust SIOCSIFADDR et al to come from an already privileged
3064 	 * layer, and do not perform any credentials checks or input
3065 	 * validation.
3066 	 */
3067 	error = so->so_proto->pr_control(so, cmd, data, ifp, td);
3068 	if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
3069 	    cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
3070 	    cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
3071 		error = (*ifp->if_ioctl)(ifp, cmd, data);
3072 
3073 	if (!(oif_flags & IFF_UP) && (ifp->if_flags & IFF_UP))
3074 		if_up(ifp);
3075 out_ref:
3076 	if_rele(ifp);
3077 out_noref:
3078 	CURVNET_RESTORE();
3079 #ifdef COMPAT_FREEBSD32
3080 	if (error != 0)
3081 		return (error);
3082 	switch (saved_cmd) {
3083 	case SIOCGIFCONF32:
3084 		ifc32->ifc_len = thunk.ifc.ifc_len;
3085 		break;
3086 	case SIOCGDRVSPEC32:
3087 		/*
3088 		 * SIOCGDRVSPEC is IOWR, but nothing actually touches
3089 		 * the struct so just assert that ifd_len (the only
3090 		 * field it might make sense to update) hasn't
3091 		 * changed.
3092 		 */
3093 		KASSERT(thunk.ifd.ifd_len == ifd32->ifd_len,
3094 		    ("ifd_len was updated %u -> %zu", ifd32->ifd_len,
3095 			thunk.ifd.ifd_len));
3096 		break;
3097 	case SIOCGIFGROUP32:
3098 	case SIOCGIFGMEMB32:
3099 		ifgr32->ifgr_len = thunk.ifgr.ifgr_len;
3100 		break;
3101 	case SIOCGIFMEDIA32:
3102 	case SIOCGIFXMEDIA32:
3103 		ifmr32->ifm_current = thunk.ifmr.ifm_current;
3104 		ifmr32->ifm_mask = thunk.ifmr.ifm_mask;
3105 		ifmr32->ifm_status = thunk.ifmr.ifm_status;
3106 		ifmr32->ifm_active = thunk.ifmr.ifm_active;
3107 		ifmr32->ifm_count = thunk.ifmr.ifm_count;
3108 		break;
3109 	}
3110 #endif
3111 	return (error);
3112 }
3113 
3114 int
3115 if_rename(struct ifnet *ifp, char *new_name)
3116 {
3117 	struct ifaddr *ifa;
3118 	struct sockaddr_dl *sdl;
3119 	size_t namelen, onamelen;
3120 	char old_name[IFNAMSIZ];
3121 	char strbuf[IFNAMSIZ + 8];
3122 
3123 	if (new_name[0] == '\0')
3124 		return (EINVAL);
3125 	if (strcmp(new_name, ifp->if_xname) == 0)
3126 		return (0);
3127 	if (ifunit(new_name) != NULL)
3128 		return (EEXIST);
3129 
3130 	/*
3131 	 * XXX: Locking.  Nothing else seems to lock if_flags,
3132 	 * and there are numerous other races with the
3133 	 * ifunit() checks not being atomic with namespace
3134 	 * changes (renames, vmoves, if_attach, etc).
3135 	 */
3136 	ifp->if_flags |= IFF_RENAMING;
3137 
3138 	EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
3139 
3140 	if_printf(ifp, "changing name to '%s'\n", new_name);
3141 
3142 	IF_ADDR_WLOCK(ifp);
3143 	strlcpy(old_name, ifp->if_xname, sizeof(old_name));
3144 	strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
3145 	ifa = ifp->if_addr;
3146 	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3147 	namelen = strlen(new_name);
3148 	onamelen = sdl->sdl_nlen;
3149 	/*
3150 	 * Move the address if needed.  This is safe because we
3151 	 * allocate space for a name of length IFNAMSIZ when we
3152 	 * create this in if_attach().
3153 	 */
3154 	if (namelen != onamelen) {
3155 		bcopy(sdl->sdl_data + onamelen,
3156 		    sdl->sdl_data + namelen, sdl->sdl_alen);
3157 	}
3158 	bcopy(new_name, sdl->sdl_data, namelen);
3159 	sdl->sdl_nlen = namelen;
3160 	sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
3161 	bzero(sdl->sdl_data, onamelen);
3162 	while (namelen != 0)
3163 		sdl->sdl_data[--namelen] = 0xff;
3164 	IF_ADDR_WUNLOCK(ifp);
3165 
3166 	EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
3167 
3168 	ifp->if_flags &= ~IFF_RENAMING;
3169 
3170 	snprintf(strbuf, sizeof(strbuf), "name=%s", new_name);
3171 	devctl_notify("IFNET", old_name, "RENAME", strbuf);
3172 
3173 	return (0);
3174 }
3175 
3176 /*
3177  * The code common to handling reference counted flags,
3178  * e.g., in ifpromisc() and if_allmulti().
3179  * The "pflag" argument can specify a permanent mode flag to check,
3180  * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
3181  *
3182  * Only to be used on stack-owned flags, not driver-owned flags.
3183  */
3184 static int
3185 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
3186 {
3187 	struct ifreq ifr;
3188 	int error;
3189 	int oldflags, oldcount;
3190 
3191 	/* Sanity checks to catch programming errors */
3192 	KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
3193 	    ("%s: setting driver-owned flag %d", __func__, flag));
3194 
3195 	if (onswitch)
3196 		KASSERT(*refcount >= 0,
3197 		    ("%s: increment negative refcount %d for flag %d",
3198 		    __func__, *refcount, flag));
3199 	else
3200 		KASSERT(*refcount > 0,
3201 		    ("%s: decrement non-positive refcount %d for flag %d",
3202 		    __func__, *refcount, flag));
3203 
3204 	/* In case this mode is permanent, just touch refcount */
3205 	if (ifp->if_flags & pflag) {
3206 		*refcount += onswitch ? 1 : -1;
3207 		return (0);
3208 	}
3209 
3210 	/* Save ifnet parameters for if_ioctl() may fail */
3211 	oldcount = *refcount;
3212 	oldflags = ifp->if_flags;
3213 
3214 	/*
3215 	 * See if we aren't the only and touching refcount is enough.
3216 	 * Actually toggle interface flag if we are the first or last.
3217 	 */
3218 	if (onswitch) {
3219 		if ((*refcount)++)
3220 			return (0);
3221 		ifp->if_flags |= flag;
3222 	} else {
3223 		if (--(*refcount))
3224 			return (0);
3225 		ifp->if_flags &= ~flag;
3226 	}
3227 
3228 	/* Call down the driver since we've changed interface flags */
3229 	if (ifp->if_ioctl == NULL) {
3230 		error = EOPNOTSUPP;
3231 		goto recover;
3232 	}
3233 	ifr.ifr_flags = ifp->if_flags & 0xffff;
3234 	ifr.ifr_flagshigh = ifp->if_flags >> 16;
3235 	error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3236 	if (error)
3237 		goto recover;
3238 	/* Notify userland that interface flags have changed */
3239 	rt_ifmsg(ifp, flag);
3240 	return (0);
3241 
3242 recover:
3243 	/* Recover after driver error */
3244 	*refcount = oldcount;
3245 	ifp->if_flags = oldflags;
3246 	return (error);
3247 }
3248 
3249 /*
3250  * Set/clear promiscuous mode on interface ifp based on the truth value
3251  * of pswitch.  The calls are reference counted so that only the first
3252  * "on" request actually has an effect, as does the final "off" request.
3253  * Results are undefined if the "off" and "on" requests are not matched.
3254  */
3255 int
3256 ifpromisc(struct ifnet *ifp, int pswitch)
3257 {
3258 	int error;
3259 	int oldflags = ifp->if_flags;
3260 
3261 	error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
3262 			   &ifp->if_pcount, pswitch);
3263 	/* If promiscuous mode status has changed, log a message */
3264 	if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) &&
3265             log_promisc_mode_change)
3266 		if_printf(ifp, "promiscuous mode %s\n",
3267 		    (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
3268 	return (error);
3269 }
3270 
3271 /*
3272  * Return interface configuration
3273  * of system.  List may be used
3274  * in later ioctl's (above) to get
3275  * other information.
3276  */
3277 /*ARGSUSED*/
3278 static int
3279 ifconf(u_long cmd, caddr_t data)
3280 {
3281 	struct ifconf *ifc = (struct ifconf *)data;
3282 	struct ifnet *ifp;
3283 	struct ifaddr *ifa;
3284 	struct ifreq ifr;
3285 	struct sbuf *sb;
3286 	int error, full = 0, valid_len, max_len;
3287 
3288 	/* Limit initial buffer size to maxphys to avoid DoS from userspace. */
3289 	max_len = maxphys - 1;
3290 
3291 	/* Prevent hostile input from being able to crash the system */
3292 	if (ifc->ifc_len <= 0)
3293 		return (EINVAL);
3294 
3295 again:
3296 	if (ifc->ifc_len <= max_len) {
3297 		max_len = ifc->ifc_len;
3298 		full = 1;
3299 	}
3300 	sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
3301 	max_len = 0;
3302 	valid_len = 0;
3303 
3304 	IFNET_RLOCK();
3305 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
3306 		struct epoch_tracker et;
3307 		int addrs;
3308 
3309 		/*
3310 		 * Zero the ifr to make sure we don't disclose the contents
3311 		 * of the stack.
3312 		 */
3313 		memset(&ifr, 0, sizeof(ifr));
3314 
3315 		if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
3316 		    >= sizeof(ifr.ifr_name)) {
3317 			sbuf_delete(sb);
3318 			IFNET_RUNLOCK();
3319 			return (ENAMETOOLONG);
3320 		}
3321 
3322 		addrs = 0;
3323 		NET_EPOCH_ENTER(et);
3324 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3325 			struct sockaddr *sa = ifa->ifa_addr;
3326 
3327 			if (prison_if(curthread->td_ucred, sa) != 0)
3328 				continue;
3329 			addrs++;
3330 			if (sa->sa_len <= sizeof(*sa)) {
3331 				if (sa->sa_len < sizeof(*sa)) {
3332 					memset(&ifr.ifr_ifru.ifru_addr, 0,
3333 					    sizeof(ifr.ifr_ifru.ifru_addr));
3334 					memcpy(&ifr.ifr_ifru.ifru_addr, sa,
3335 					    sa->sa_len);
3336 				} else
3337 					ifr.ifr_ifru.ifru_addr = *sa;
3338 				sbuf_bcat(sb, &ifr, sizeof(ifr));
3339 				max_len += sizeof(ifr);
3340 			} else {
3341 				sbuf_bcat(sb, &ifr,
3342 				    offsetof(struct ifreq, ifr_addr));
3343 				max_len += offsetof(struct ifreq, ifr_addr);
3344 				sbuf_bcat(sb, sa, sa->sa_len);
3345 				max_len += sa->sa_len;
3346 			}
3347 
3348 			if (sbuf_error(sb) == 0)
3349 				valid_len = sbuf_len(sb);
3350 		}
3351 		NET_EPOCH_EXIT(et);
3352 		if (addrs == 0) {
3353 			sbuf_bcat(sb, &ifr, sizeof(ifr));
3354 			max_len += sizeof(ifr);
3355 
3356 			if (sbuf_error(sb) == 0)
3357 				valid_len = sbuf_len(sb);
3358 		}
3359 	}
3360 	IFNET_RUNLOCK();
3361 
3362 	/*
3363 	 * If we didn't allocate enough space (uncommon), try again.  If
3364 	 * we have already allocated as much space as we are allowed,
3365 	 * return what we've got.
3366 	 */
3367 	if (valid_len != max_len && !full) {
3368 		sbuf_delete(sb);
3369 		goto again;
3370 	}
3371 
3372 	ifc->ifc_len = valid_len;
3373 	sbuf_finish(sb);
3374 	error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
3375 	sbuf_delete(sb);
3376 	return (error);
3377 }
3378 
3379 /*
3380  * Just like ifpromisc(), but for all-multicast-reception mode.
3381  */
3382 int
3383 if_allmulti(struct ifnet *ifp, int onswitch)
3384 {
3385 
3386 	return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
3387 }
3388 
3389 struct ifmultiaddr *
3390 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa)
3391 {
3392 	struct ifmultiaddr *ifma;
3393 
3394 	IF_ADDR_LOCK_ASSERT(ifp);
3395 
3396 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
3397 		if (sa->sa_family == AF_LINK) {
3398 			if (sa_dl_equal(ifma->ifma_addr, sa))
3399 				break;
3400 		} else {
3401 			if (sa_equal(ifma->ifma_addr, sa))
3402 				break;
3403 		}
3404 	}
3405 
3406 	return ifma;
3407 }
3408 
3409 /*
3410  * Allocate a new ifmultiaddr and initialize based on passed arguments.  We
3411  * make copies of passed sockaddrs.  The ifmultiaddr will not be added to
3412  * the ifnet multicast address list here, so the caller must do that and
3413  * other setup work (such as notifying the device driver).  The reference
3414  * count is initialized to 1.
3415  */
3416 static struct ifmultiaddr *
3417 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
3418     int mflags)
3419 {
3420 	struct ifmultiaddr *ifma;
3421 	struct sockaddr *dupsa;
3422 
3423 	ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
3424 	    M_ZERO);
3425 	if (ifma == NULL)
3426 		return (NULL);
3427 
3428 	dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
3429 	if (dupsa == NULL) {
3430 		free(ifma, M_IFMADDR);
3431 		return (NULL);
3432 	}
3433 	bcopy(sa, dupsa, sa->sa_len);
3434 	ifma->ifma_addr = dupsa;
3435 
3436 	ifma->ifma_ifp = ifp;
3437 	ifma->ifma_refcount = 1;
3438 	ifma->ifma_protospec = NULL;
3439 
3440 	if (llsa == NULL) {
3441 		ifma->ifma_lladdr = NULL;
3442 		return (ifma);
3443 	}
3444 
3445 	dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
3446 	if (dupsa == NULL) {
3447 		free(ifma->ifma_addr, M_IFMADDR);
3448 		free(ifma, M_IFMADDR);
3449 		return (NULL);
3450 	}
3451 	bcopy(llsa, dupsa, llsa->sa_len);
3452 	ifma->ifma_lladdr = dupsa;
3453 
3454 	return (ifma);
3455 }
3456 
3457 /*
3458  * if_freemulti: free ifmultiaddr structure and possibly attached related
3459  * addresses.  The caller is responsible for implementing reference
3460  * counting, notifying the driver, handling routing messages, and releasing
3461  * any dependent link layer state.
3462  */
3463 #ifdef MCAST_VERBOSE
3464 extern void kdb_backtrace(void);
3465 #endif
3466 static void
3467 if_freemulti_internal(struct ifmultiaddr *ifma)
3468 {
3469 
3470 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
3471 	    ifma->ifma_refcount));
3472 
3473 	if (ifma->ifma_lladdr != NULL)
3474 		free(ifma->ifma_lladdr, M_IFMADDR);
3475 #ifdef MCAST_VERBOSE
3476 	kdb_backtrace();
3477 	printf("%s freeing ifma: %p\n", __func__, ifma);
3478 #endif
3479 	free(ifma->ifma_addr, M_IFMADDR);
3480 	free(ifma, M_IFMADDR);
3481 }
3482 
3483 static void
3484 if_destroymulti(epoch_context_t ctx)
3485 {
3486 	struct ifmultiaddr *ifma;
3487 
3488 	ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx);
3489 	if_freemulti_internal(ifma);
3490 }
3491 
3492 void
3493 if_freemulti(struct ifmultiaddr *ifma)
3494 {
3495 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d",
3496 	    ifma->ifma_refcount));
3497 
3498 	NET_EPOCH_CALL(if_destroymulti, &ifma->ifma_epoch_ctx);
3499 }
3500 
3501 /*
3502  * Register an additional multicast address with a network interface.
3503  *
3504  * - If the address is already present, bump the reference count on the
3505  *   address and return.
3506  * - If the address is not link-layer, look up a link layer address.
3507  * - Allocate address structures for one or both addresses, and attach to the
3508  *   multicast address list on the interface.  If automatically adding a link
3509  *   layer address, the protocol address will own a reference to the link
3510  *   layer address, to be freed when it is freed.
3511  * - Notify the network device driver of an addition to the multicast address
3512  *   list.
3513  *
3514  * 'sa' points to caller-owned memory with the desired multicast address.
3515  *
3516  * 'retifma' will be used to return a pointer to the resulting multicast
3517  * address reference, if desired.
3518  */
3519 int
3520 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
3521     struct ifmultiaddr **retifma)
3522 {
3523 	struct ifmultiaddr *ifma, *ll_ifma;
3524 	struct sockaddr *llsa;
3525 	struct sockaddr_dl sdl;
3526 	int error;
3527 
3528 #ifdef INET
3529 	IN_MULTI_LIST_UNLOCK_ASSERT();
3530 #endif
3531 #ifdef INET6
3532 	IN6_MULTI_LIST_UNLOCK_ASSERT();
3533 #endif
3534 	/*
3535 	 * If the address is already present, return a new reference to it;
3536 	 * otherwise, allocate storage and set up a new address.
3537 	 */
3538 	IF_ADDR_WLOCK(ifp);
3539 	ifma = if_findmulti(ifp, sa);
3540 	if (ifma != NULL) {
3541 		ifma->ifma_refcount++;
3542 		if (retifma != NULL)
3543 			*retifma = ifma;
3544 		IF_ADDR_WUNLOCK(ifp);
3545 		return (0);
3546 	}
3547 
3548 	/*
3549 	 * The address isn't already present; resolve the protocol address
3550 	 * into a link layer address, and then look that up, bump its
3551 	 * refcount or allocate an ifma for that also.
3552 	 * Most link layer resolving functions returns address data which
3553 	 * fits inside default sockaddr_dl structure. However callback
3554 	 * can allocate another sockaddr structure, in that case we need to
3555 	 * free it later.
3556 	 */
3557 	llsa = NULL;
3558 	ll_ifma = NULL;
3559 	if (ifp->if_resolvemulti != NULL) {
3560 		/* Provide called function with buffer size information */
3561 		sdl.sdl_len = sizeof(sdl);
3562 		llsa = (struct sockaddr *)&sdl;
3563 		error = ifp->if_resolvemulti(ifp, &llsa, sa);
3564 		if (error)
3565 			goto unlock_out;
3566 	}
3567 
3568 	/*
3569 	 * Allocate the new address.  Don't hook it up yet, as we may also
3570 	 * need to allocate a link layer multicast address.
3571 	 */
3572 	ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3573 	if (ifma == NULL) {
3574 		error = ENOMEM;
3575 		goto free_llsa_out;
3576 	}
3577 
3578 	/*
3579 	 * If a link layer address is found, we'll need to see if it's
3580 	 * already present in the address list, or allocate is as well.
3581 	 * When this block finishes, the link layer address will be on the
3582 	 * list.
3583 	 */
3584 	if (llsa != NULL) {
3585 		ll_ifma = if_findmulti(ifp, llsa);
3586 		if (ll_ifma == NULL) {
3587 			ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3588 			if (ll_ifma == NULL) {
3589 				--ifma->ifma_refcount;
3590 				if_freemulti(ifma);
3591 				error = ENOMEM;
3592 				goto free_llsa_out;
3593 			}
3594 			ll_ifma->ifma_flags |= IFMA_F_ENQUEUED;
3595 			CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3596 			    ifma_link);
3597 		} else
3598 			ll_ifma->ifma_refcount++;
3599 		ifma->ifma_llifma = ll_ifma;
3600 	}
3601 
3602 	/*
3603 	 * We now have a new multicast address, ifma, and possibly a new or
3604 	 * referenced link layer address.  Add the primary address to the
3605 	 * ifnet address list.
3606 	 */
3607 	ifma->ifma_flags |= IFMA_F_ENQUEUED;
3608 	CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3609 
3610 	if (retifma != NULL)
3611 		*retifma = ifma;
3612 
3613 	/*
3614 	 * Must generate the message while holding the lock so that 'ifma'
3615 	 * pointer is still valid.
3616 	 */
3617 	rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3618 	IF_ADDR_WUNLOCK(ifp);
3619 
3620 	/*
3621 	 * We are certain we have added something, so call down to the
3622 	 * interface to let them know about it.
3623 	 */
3624 	if (ifp->if_ioctl != NULL) {
3625 		if (THREAD_CAN_SLEEP())
3626 			(void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3627 		else
3628 			taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask);
3629 	}
3630 
3631 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3632 		link_free_sdl(llsa);
3633 
3634 	return (0);
3635 
3636 free_llsa_out:
3637 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3638 		link_free_sdl(llsa);
3639 
3640 unlock_out:
3641 	IF_ADDR_WUNLOCK(ifp);
3642 	return (error);
3643 }
3644 
3645 static void
3646 if_siocaddmulti(void *arg, int pending)
3647 {
3648 	struct ifnet *ifp;
3649 
3650 	ifp = arg;
3651 #ifdef DIAGNOSTIC
3652 	if (pending > 1)
3653 		if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending);
3654 #endif
3655 	CURVNET_SET(ifp->if_vnet);
3656 	(void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3657 	CURVNET_RESTORE();
3658 }
3659 
3660 /*
3661  * Delete a multicast group membership by network-layer group address.
3662  *
3663  * Returns ENOENT if the entry could not be found. If ifp no longer
3664  * exists, results are undefined. This entry point should only be used
3665  * from subsystems which do appropriate locking to hold ifp for the
3666  * duration of the call.
3667  * Network-layer protocol domains must use if_delmulti_ifma().
3668  */
3669 int
3670 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3671 {
3672 	struct ifmultiaddr *ifma;
3673 	int lastref;
3674 
3675 	KASSERT(ifp, ("%s: NULL ifp", __func__));
3676 
3677 	IF_ADDR_WLOCK(ifp);
3678 	lastref = 0;
3679 	ifma = if_findmulti(ifp, sa);
3680 	if (ifma != NULL)
3681 		lastref = if_delmulti_locked(ifp, ifma, 0);
3682 	IF_ADDR_WUNLOCK(ifp);
3683 
3684 	if (ifma == NULL)
3685 		return (ENOENT);
3686 
3687 	if (lastref && ifp->if_ioctl != NULL) {
3688 		(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3689 	}
3690 
3691 	return (0);
3692 }
3693 
3694 /*
3695  * Delete all multicast group membership for an interface.
3696  * Should be used to quickly flush all multicast filters.
3697  */
3698 void
3699 if_delallmulti(struct ifnet *ifp)
3700 {
3701 	struct ifmultiaddr *ifma;
3702 	struct ifmultiaddr *next;
3703 
3704 	IF_ADDR_WLOCK(ifp);
3705 	CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3706 		if_delmulti_locked(ifp, ifma, 0);
3707 	IF_ADDR_WUNLOCK(ifp);
3708 }
3709 
3710 void
3711 if_delmulti_ifma(struct ifmultiaddr *ifma)
3712 {
3713 	if_delmulti_ifma_flags(ifma, 0);
3714 }
3715 
3716 /*
3717  * Delete a multicast group membership by group membership pointer.
3718  * Network-layer protocol domains must use this routine.
3719  *
3720  * It is safe to call this routine if the ifp disappeared.
3721  */
3722 void
3723 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags)
3724 {
3725 	struct ifnet *ifp;
3726 	int lastref;
3727 	MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma);
3728 #ifdef INET
3729 	IN_MULTI_LIST_UNLOCK_ASSERT();
3730 #endif
3731 	ifp = ifma->ifma_ifp;
3732 #ifdef DIAGNOSTIC
3733 	if (ifp == NULL) {
3734 		printf("%s: ifma_ifp seems to be detached\n", __func__);
3735 	} else {
3736 		struct epoch_tracker et;
3737 		struct ifnet *oifp;
3738 
3739 		NET_EPOCH_ENTER(et);
3740 		CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link)
3741 			if (ifp == oifp)
3742 				break;
3743 		NET_EPOCH_EXIT(et);
3744 		if (ifp != oifp)
3745 			ifp = NULL;
3746 	}
3747 #endif
3748 	/*
3749 	 * If and only if the ifnet instance exists: Acquire the address lock.
3750 	 */
3751 	if (ifp != NULL)
3752 		IF_ADDR_WLOCK(ifp);
3753 
3754 	lastref = if_delmulti_locked(ifp, ifma, flags);
3755 
3756 	if (ifp != NULL) {
3757 		/*
3758 		 * If and only if the ifnet instance exists:
3759 		 *  Release the address lock.
3760 		 *  If the group was left: update the hardware hash filter.
3761 		 */
3762 		IF_ADDR_WUNLOCK(ifp);
3763 		if (lastref && ifp->if_ioctl != NULL) {
3764 			(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3765 		}
3766 	}
3767 }
3768 
3769 /*
3770  * Perform deletion of network-layer and/or link-layer multicast address.
3771  *
3772  * Return 0 if the reference count was decremented.
3773  * Return 1 if the final reference was released, indicating that the
3774  * hardware hash filter should be reprogrammed.
3775  */
3776 static int
3777 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3778 {
3779 	struct ifmultiaddr *ll_ifma;
3780 
3781 	if (ifp != NULL && ifma->ifma_ifp != NULL) {
3782 		KASSERT(ifma->ifma_ifp == ifp,
3783 		    ("%s: inconsistent ifp %p", __func__, ifp));
3784 		IF_ADDR_WLOCK_ASSERT(ifp);
3785 	}
3786 
3787 	ifp = ifma->ifma_ifp;
3788 	MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : "");
3789 
3790 	/*
3791 	 * If the ifnet is detaching, null out references to ifnet,
3792 	 * so that upper protocol layers will notice, and not attempt
3793 	 * to obtain locks for an ifnet which no longer exists. The
3794 	 * routing socket announcement must happen before the ifnet
3795 	 * instance is detached from the system.
3796 	 */
3797 	if (detaching) {
3798 #ifdef DIAGNOSTIC
3799 		printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3800 #endif
3801 		/*
3802 		 * ifp may already be nulled out if we are being reentered
3803 		 * to delete the ll_ifma.
3804 		 */
3805 		if (ifp != NULL) {
3806 			rt_newmaddrmsg(RTM_DELMADDR, ifma);
3807 			ifma->ifma_ifp = NULL;
3808 		}
3809 	}
3810 
3811 	if (--ifma->ifma_refcount > 0)
3812 		return 0;
3813 
3814 	if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) {
3815 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
3816 		ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
3817 	}
3818 	/*
3819 	 * If this ifma is a network-layer ifma, a link-layer ifma may
3820 	 * have been associated with it. Release it first if so.
3821 	 */
3822 	ll_ifma = ifma->ifma_llifma;
3823 	if (ll_ifma != NULL) {
3824 		KASSERT(ifma->ifma_lladdr != NULL,
3825 		    ("%s: llifma w/o lladdr", __func__));
3826 		if (detaching)
3827 			ll_ifma->ifma_ifp = NULL;	/* XXX */
3828 		if (--ll_ifma->ifma_refcount == 0) {
3829 			if (ifp != NULL) {
3830 				if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) {
3831 					CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr,
3832 						ifma_link);
3833 					ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
3834 				}
3835 			}
3836 			if_freemulti(ll_ifma);
3837 		}
3838 	}
3839 #ifdef INVARIANTS
3840 	if (ifp) {
3841 		struct ifmultiaddr *ifmatmp;
3842 
3843 		CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link)
3844 			MPASS(ifma != ifmatmp);
3845 	}
3846 #endif
3847 	if_freemulti(ifma);
3848 	/*
3849 	 * The last reference to this instance of struct ifmultiaddr
3850 	 * was released; the hardware should be notified of this change.
3851 	 */
3852 	return 1;
3853 }
3854 
3855 /*
3856  * Set the link layer address on an interface.
3857  *
3858  * At this time we only support certain types of interfaces,
3859  * and we don't allow the length of the address to change.
3860  *
3861  * Set noinline to be dtrace-friendly
3862  */
3863 __noinline int
3864 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3865 {
3866 	struct sockaddr_dl *sdl;
3867 	struct ifaddr *ifa;
3868 	struct ifreq ifr;
3869 
3870 	ifa = ifp->if_addr;
3871 	if (ifa == NULL)
3872 		return (EINVAL);
3873 
3874 	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3875 	if (sdl == NULL)
3876 		return (EINVAL);
3877 
3878 	if (len != sdl->sdl_alen)	/* don't allow length to change */
3879 		return (EINVAL);
3880 
3881 	switch (ifp->if_type) {
3882 	case IFT_ETHER:
3883 	case IFT_XETHER:
3884 	case IFT_L2VLAN:
3885 	case IFT_BRIDGE:
3886 	case IFT_IEEE8023ADLAG:
3887 		bcopy(lladdr, LLADDR(sdl), len);
3888 		break;
3889 	default:
3890 		return (ENODEV);
3891 	}
3892 
3893 	/*
3894 	 * If the interface is already up, we need
3895 	 * to re-init it in order to reprogram its
3896 	 * address filter.
3897 	 */
3898 	if ((ifp->if_flags & IFF_UP) != 0) {
3899 		if (ifp->if_ioctl) {
3900 			ifp->if_flags &= ~IFF_UP;
3901 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3902 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3903 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3904 			ifp->if_flags |= IFF_UP;
3905 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3906 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3907 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3908 		}
3909 	}
3910 	EVENTHANDLER_INVOKE(iflladdr_event, ifp);
3911 
3912 	return (0);
3913 }
3914 
3915 /*
3916  * Compat function for handling basic encapsulation requests.
3917  * Not converted stacks (FDDI, IB, ..) supports traditional
3918  * output model: ARP (and other similar L2 protocols) are handled
3919  * inside output routine, arpresolve/nd6_resolve() returns MAC
3920  * address instead of full prepend.
3921  *
3922  * This function creates calculated header==MAC for IPv4/IPv6 and
3923  * returns EAFNOSUPPORT (which is then handled in ARP code) for other
3924  * address families.
3925  */
3926 static int
3927 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req)
3928 {
3929 	if (req->rtype != IFENCAP_LL)
3930 		return (EOPNOTSUPP);
3931 
3932 	if (req->bufsize < req->lladdr_len)
3933 		return (ENOMEM);
3934 
3935 	switch (req->family) {
3936 	case AF_INET:
3937 	case AF_INET6:
3938 		break;
3939 	default:
3940 		return (EAFNOSUPPORT);
3941 	}
3942 
3943 	/* Copy lladdr to storage as is */
3944 	memmove(req->buf, req->lladdr, req->lladdr_len);
3945 	req->bufsize = req->lladdr_len;
3946 	req->lladdr_off = 0;
3947 
3948 	return (0);
3949 }
3950 
3951 /*
3952  * Tunnel interfaces can nest, also they may cause infinite recursion
3953  * calls when misconfigured. We'll prevent this by detecting loops.
3954  * High nesting level may cause stack exhaustion. We'll prevent this
3955  * by introducing upper limit.
3956  *
3957  * Return 0, if tunnel nesting count is equal or less than limit.
3958  */
3959 int
3960 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie,
3961     int limit)
3962 {
3963 	struct m_tag *mtag;
3964 	int count;
3965 
3966 	count = 1;
3967 	mtag = NULL;
3968 	while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) {
3969 		if (*(struct ifnet **)(mtag + 1) == ifp) {
3970 			log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp));
3971 			return (EIO);
3972 		}
3973 		count++;
3974 	}
3975 	if (count > limit) {
3976 		log(LOG_NOTICE,
3977 		    "%s: if_output recursively called too many times(%d)\n",
3978 		    if_name(ifp), count);
3979 		return (EIO);
3980 	}
3981 	mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT);
3982 	if (mtag == NULL)
3983 		return (ENOMEM);
3984 	*(struct ifnet **)(mtag + 1) = ifp;
3985 	m_tag_prepend(m, mtag);
3986 	return (0);
3987 }
3988 
3989 /*
3990  * Get the link layer address that was read from the hardware at attach.
3991  *
3992  * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type
3993  * their component interfaces as IFT_IEEE8023ADLAG.
3994  */
3995 int
3996 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr)
3997 {
3998 	if (ifp->if_hw_addr == NULL)
3999 		return (ENODEV);
4000 
4001 	switch (ifp->if_type) {
4002 	case IFT_ETHER:
4003 	case IFT_IEEE8023ADLAG:
4004 		bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen);
4005 		return (0);
4006 	default:
4007 		return (ENODEV);
4008 	}
4009 }
4010 
4011 /*
4012  * The name argument must be a pointer to storage which will last as
4013  * long as the interface does.  For physical devices, the result of
4014  * device_get_name(dev) is a good choice and for pseudo-devices a
4015  * static string works well.
4016  */
4017 void
4018 if_initname(struct ifnet *ifp, const char *name, int unit)
4019 {
4020 	ifp->if_dname = name;
4021 	ifp->if_dunit = unit;
4022 	if (unit != IF_DUNIT_NONE)
4023 		snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
4024 	else
4025 		strlcpy(ifp->if_xname, name, IFNAMSIZ);
4026 }
4027 
4028 static int
4029 if_vlog(struct ifnet *ifp, int pri, const char *fmt, va_list ap)
4030 {
4031 	char if_fmt[256];
4032 
4033 	snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt);
4034 	vlog(pri, if_fmt, ap);
4035 	return (0);
4036 }
4037 
4038 
4039 int
4040 if_printf(struct ifnet *ifp, const char *fmt, ...)
4041 {
4042 	va_list ap;
4043 
4044 	va_start(ap, fmt);
4045 	if_vlog(ifp, LOG_INFO, fmt, ap);
4046 	va_end(ap);
4047 	return (0);
4048 }
4049 
4050 int
4051 if_log(struct ifnet *ifp, int pri, const char *fmt, ...)
4052 {
4053 	va_list ap;
4054 
4055 	va_start(ap, fmt);
4056 	if_vlog(ifp, pri, fmt, ap);
4057 	va_end(ap);
4058 	return (0);
4059 }
4060 
4061 void
4062 if_start(struct ifnet *ifp)
4063 {
4064 
4065 	(*(ifp)->if_start)(ifp);
4066 }
4067 
4068 /*
4069  * Backwards compatibility interface for drivers
4070  * that have not implemented it
4071  */
4072 static int
4073 if_transmit_default(struct ifnet *ifp, struct mbuf *m)
4074 {
4075 	int error;
4076 
4077 	IFQ_HANDOFF(ifp, m, error);
4078 	return (error);
4079 }
4080 
4081 static void
4082 if_input_default(struct ifnet *ifp __unused, struct mbuf *m)
4083 {
4084 	m_freem(m);
4085 }
4086 
4087 int
4088 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
4089 {
4090 	int active = 0;
4091 
4092 	IF_LOCK(ifq);
4093 	if (_IF_QFULL(ifq)) {
4094 		IF_UNLOCK(ifq);
4095 		if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
4096 		m_freem(m);
4097 		return (0);
4098 	}
4099 	if (ifp != NULL) {
4100 		if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust);
4101 		if (m->m_flags & (M_BCAST|M_MCAST))
4102 			if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
4103 		active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
4104 	}
4105 	_IF_ENQUEUE(ifq, m);
4106 	IF_UNLOCK(ifq);
4107 	if (ifp != NULL && !active)
4108 		(*(ifp)->if_start)(ifp);
4109 	return (1);
4110 }
4111 
4112 void
4113 if_register_com_alloc(u_char type,
4114     if_com_alloc_t *a, if_com_free_t *f)
4115 {
4116 
4117 	KASSERT(if_com_alloc[type] == NULL,
4118 	    ("if_register_com_alloc: %d already registered", type));
4119 	KASSERT(if_com_free[type] == NULL,
4120 	    ("if_register_com_alloc: %d free already registered", type));
4121 
4122 	if_com_alloc[type] = a;
4123 	if_com_free[type] = f;
4124 }
4125 
4126 void
4127 if_deregister_com_alloc(u_char type)
4128 {
4129 
4130 	KASSERT(if_com_alloc[type] != NULL,
4131 	    ("if_deregister_com_alloc: %d not registered", type));
4132 	KASSERT(if_com_free[type] != NULL,
4133 	    ("if_deregister_com_alloc: %d free not registered", type));
4134 
4135 	/*
4136 	 * Ensure all pending EPOCH(9) callbacks have been executed. This
4137 	 * fixes issues about late invocation of if_destroy(), which leads
4138 	 * to memory leak from if_com_alloc[type] allocated if_l2com.
4139 	 */
4140 	NET_EPOCH_DRAIN_CALLBACKS();
4141 
4142 	if_com_alloc[type] = NULL;
4143 	if_com_free[type] = NULL;
4144 }
4145 
4146 /* API for driver access to network stack owned ifnet.*/
4147 uint64_t
4148 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate)
4149 {
4150 	uint64_t oldbrate;
4151 
4152 	oldbrate = ifp->if_baudrate;
4153 	ifp->if_baudrate = baudrate;
4154 	return (oldbrate);
4155 }
4156 
4157 uint64_t
4158 if_getbaudrate(const if_t ifp)
4159 {
4160 	return (ifp->if_baudrate);
4161 }
4162 
4163 int
4164 if_setcapabilities(if_t ifp, int capabilities)
4165 {
4166 	ifp->if_capabilities = capabilities;
4167 	return (0);
4168 }
4169 
4170 int
4171 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit)
4172 {
4173 	ifp->if_capabilities &= ~clearbit;
4174 	ifp->if_capabilities |= setbit;
4175 	return (0);
4176 }
4177 
4178 int
4179 if_getcapabilities(const if_t ifp)
4180 {
4181 	return (ifp->if_capabilities);
4182 }
4183 
4184 int
4185 if_setcapenable(if_t ifp, int capabilities)
4186 {
4187 	ifp->if_capenable = capabilities;
4188 	return (0);
4189 }
4190 
4191 int
4192 if_setcapenablebit(if_t ifp, int setcap, int clearcap)
4193 {
4194 	ifp->if_capenable &= ~clearcap;
4195 	ifp->if_capenable |= setcap;
4196 	return (0);
4197 }
4198 
4199 int
4200 if_setcapabilities2(if_t ifp, int capabilities)
4201 {
4202 	ifp->if_capabilities2 = capabilities;
4203 	return (0);
4204 }
4205 
4206 int
4207 if_setcapabilities2bit(if_t ifp, int setbit, int clearbit)
4208 {
4209 	ifp->if_capabilities2 &= ~clearbit;
4210 	ifp->if_capabilities2 |= setbit;
4211 	return (0);
4212 }
4213 
4214 int
4215 if_getcapabilities2(const if_t ifp)
4216 {
4217 	return (ifp->if_capabilities2);
4218 }
4219 
4220 int
4221 if_setcapenable2(if_t ifp, int capabilities2)
4222 {
4223 	ifp->if_capenable2 = capabilities2;
4224 	return (0);
4225 }
4226 
4227 int
4228 if_setcapenable2bit(if_t ifp, int setcap, int clearcap)
4229 {
4230 	ifp->if_capenable2 &= ~clearcap;
4231 	ifp->if_capenable2 |= setcap;
4232 	return (0);
4233 }
4234 
4235 const char *
4236 if_getdname(const if_t ifp)
4237 {
4238 	return (ifp->if_dname);
4239 }
4240 
4241 void
4242 if_setdname(if_t ifp, const char *dname)
4243 {
4244 	ifp->if_dname = dname;
4245 }
4246 
4247 const char *
4248 if_name(if_t ifp)
4249 {
4250 	return (ifp->if_xname);
4251 }
4252 
4253 int
4254 if_setname(if_t ifp, const char *name)
4255 {
4256 	if (strlen(name) > sizeof(ifp->if_xname) - 1)
4257 		return (ENAMETOOLONG);
4258 	strcpy(ifp->if_xname, name);
4259 
4260 	return (0);
4261 }
4262 
4263 int
4264 if_togglecapenable(if_t ifp, int togglecap)
4265 {
4266 	ifp->if_capenable ^= togglecap;
4267 	return (0);
4268 }
4269 
4270 int
4271 if_getcapenable(const if_t ifp)
4272 {
4273 	return (ifp->if_capenable);
4274 }
4275 
4276 int
4277 if_togglecapenable2(if_t ifp, int togglecap)
4278 {
4279 	ifp->if_capenable2 ^= togglecap;
4280 	return (0);
4281 }
4282 
4283 int
4284 if_getcapenable2(const if_t ifp)
4285 {
4286 	return (ifp->if_capenable2);
4287 }
4288 
4289 int
4290 if_getdunit(const if_t ifp)
4291 {
4292 	return (ifp->if_dunit);
4293 }
4294 
4295 int
4296 if_getindex(const if_t ifp)
4297 {
4298 	return (ifp->if_index);
4299 }
4300 
4301 int
4302 if_getidxgen(const if_t ifp)
4303 {
4304 	return (ifp->if_idxgen);
4305 }
4306 
4307 const char *
4308 if_getdescr(if_t ifp)
4309 {
4310 	return (ifp->if_description);
4311 }
4312 
4313 void
4314 if_setdescr(if_t ifp, char *descrbuf)
4315 {
4316 	sx_xlock(&ifdescr_sx);
4317 	char *odescrbuf = ifp->if_description;
4318 	ifp->if_description = descrbuf;
4319 	sx_xunlock(&ifdescr_sx);
4320 
4321 	if_freedescr(odescrbuf);
4322 }
4323 
4324 char *
4325 if_allocdescr(size_t sz, int malloc_flag)
4326 {
4327 	malloc_flag &= (M_WAITOK | M_NOWAIT);
4328 	return (malloc(sz, M_IFDESCR, M_ZERO | malloc_flag));
4329 }
4330 
4331 void
4332 if_freedescr(char *descrbuf)
4333 {
4334 	free(descrbuf, M_IFDESCR);
4335 }
4336 
4337 int
4338 if_getalloctype(const if_t ifp)
4339 {
4340 	return (ifp->if_alloctype);
4341 }
4342 
4343 void
4344 if_setlastchange(if_t ifp)
4345 {
4346 	getmicrotime(&ifp->if_lastchange);
4347 }
4348 
4349 /*
4350  * This is largely undesirable because it ties ifnet to a device, but does
4351  * provide flexiblity for an embedded product vendor. Should be used with
4352  * the understanding that it violates the interface boundaries, and should be
4353  * a last resort only.
4354  */
4355 int
4356 if_setdev(if_t ifp, void *dev)
4357 {
4358 	return (0);
4359 }
4360 
4361 int
4362 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags)
4363 {
4364 	ifp->if_drv_flags &= ~clear_flags;
4365 	ifp->if_drv_flags |= set_flags;
4366 
4367 	return (0);
4368 }
4369 
4370 int
4371 if_getdrvflags(const if_t ifp)
4372 {
4373 	return (ifp->if_drv_flags);
4374 }
4375 
4376 int
4377 if_setdrvflags(if_t ifp, int flags)
4378 {
4379 	ifp->if_drv_flags = flags;
4380 	return (0);
4381 }
4382 
4383 int
4384 if_setflags(if_t ifp, int flags)
4385 {
4386 	ifp->if_flags = flags;
4387 	return (0);
4388 }
4389 
4390 int
4391 if_setflagbits(if_t ifp, int set, int clear)
4392 {
4393 	ifp->if_flags &= ~clear;
4394 	ifp->if_flags |= set;
4395 	return (0);
4396 }
4397 
4398 int
4399 if_getflags(const if_t ifp)
4400 {
4401 	return (ifp->if_flags);
4402 }
4403 
4404 int
4405 if_clearhwassist(if_t ifp)
4406 {
4407 	ifp->if_hwassist = 0;
4408 	return (0);
4409 }
4410 
4411 int
4412 if_sethwassistbits(if_t ifp, int toset, int toclear)
4413 {
4414 	ifp->if_hwassist &= ~toclear;
4415 	ifp->if_hwassist |= toset;
4416 
4417 	return (0);
4418 }
4419 
4420 int
4421 if_sethwassist(if_t ifp, int hwassist_bit)
4422 {
4423 	ifp->if_hwassist = hwassist_bit;
4424 	return (0);
4425 }
4426 
4427 int
4428 if_gethwassist(const if_t ifp)
4429 {
4430 	return (ifp->if_hwassist);
4431 }
4432 
4433 int
4434 if_togglehwassist(if_t ifp, int toggle_bits)
4435 {
4436 	ifp->if_hwassist ^= toggle_bits;
4437 	return (0);
4438 }
4439 
4440 int
4441 if_setmtu(if_t ifp, int mtu)
4442 {
4443 	ifp->if_mtu = mtu;
4444 	return (0);
4445 }
4446 
4447 void
4448 if_notifymtu(if_t ifp)
4449 {
4450 #ifdef INET6
4451 	nd6_setmtu(ifp);
4452 #endif
4453 	rt_updatemtu(ifp);
4454 }
4455 
4456 int
4457 if_getmtu(const if_t ifp)
4458 {
4459 	return (ifp->if_mtu);
4460 }
4461 
4462 int
4463 if_getmtu_family(const if_t ifp, int family)
4464 {
4465 	struct domain *dp;
4466 
4467 	SLIST_FOREACH(dp, &domains, dom_next) {
4468 		if (dp->dom_family == family && dp->dom_ifmtu != NULL)
4469 			return (dp->dom_ifmtu(ifp));
4470 	}
4471 
4472 	return (ifp->if_mtu);
4473 }
4474 
4475 /*
4476  * Methods for drivers to access interface unicast and multicast
4477  * link level addresses.  Driver shall not know 'struct ifaddr' neither
4478  * 'struct ifmultiaddr'.
4479  */
4480 u_int
4481 if_lladdr_count(if_t ifp)
4482 {
4483 	struct epoch_tracker et;
4484 	struct ifaddr *ifa;
4485 	u_int count;
4486 
4487 	count = 0;
4488 	NET_EPOCH_ENTER(et);
4489 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4490 		if (ifa->ifa_addr->sa_family == AF_LINK)
4491 			count++;
4492 	NET_EPOCH_EXIT(et);
4493 
4494 	return (count);
4495 }
4496 
4497 int
4498 if_foreach(if_foreach_cb_t cb, void *cb_arg)
4499 {
4500 	if_t ifp;
4501 	int error;
4502 
4503 	NET_EPOCH_ASSERT();
4504 	MPASS(cb);
4505 
4506 	error = 0;
4507 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
4508 		error = cb(ifp, cb_arg);
4509 		if (error != 0)
4510 			break;
4511 	}
4512 
4513 	return (error);
4514 }
4515 
4516 /*
4517  * Iterates over the list of interfaces, permitting callback function @cb to sleep.
4518  * Stops iteration if @cb returns non-zero error code.
4519  * Returns the last error code from @cb.
4520  * @match_cb: optional match callback limiting the iteration to only matched interfaces
4521  * @match_arg: argument to pass to @match_cb
4522  * @cb: iteration callback
4523  * @cb_arg: argument to pass to @cb
4524  */
4525 int
4526 if_foreach_sleep(if_foreach_match_t match_cb, void *match_arg, if_foreach_cb_t cb,
4527     void *cb_arg)
4528 {
4529 	int match_count = 0, array_size = 16; /* 128 bytes for malloc */
4530 	struct ifnet **match_array = NULL;
4531 	int error = 0;
4532 
4533 	MPASS(cb);
4534 
4535 	while (true) {
4536 		struct ifnet **new_array;
4537 		int new_size = array_size;
4538 		struct epoch_tracker et;
4539 		struct ifnet *ifp;
4540 
4541 		while (new_size < match_count)
4542 			new_size *= 2;
4543 		new_array = malloc(new_size * sizeof(void *), M_TEMP, M_WAITOK);
4544 		if (match_array != NULL)
4545 			memcpy(new_array, match_array, array_size * sizeof(void *));
4546 		free(match_array, M_TEMP);
4547 		match_array = new_array;
4548 		array_size = new_size;
4549 
4550 		match_count = 0;
4551 		NET_EPOCH_ENTER(et);
4552 		CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
4553 			if (match_cb != NULL && !match_cb(ifp, match_arg))
4554 				continue;
4555 			if (match_count < array_size) {
4556 				if (if_try_ref(ifp))
4557 					match_array[match_count++] = ifp;
4558 			} else
4559 				match_count++;
4560 		}
4561 		NET_EPOCH_EXIT(et);
4562 
4563 		if (match_count > array_size) {
4564 			for (int i = 0; i < array_size; i++)
4565 				if_rele(match_array[i]);
4566 			continue;
4567 		} else {
4568 			for (int i = 0; i < match_count; i++) {
4569 				if (error == 0)
4570 					error = cb(match_array[i], cb_arg);
4571 				if_rele(match_array[i]);
4572 			}
4573 			free(match_array, M_TEMP);
4574 			break;
4575 		}
4576 	}
4577 
4578 	return (error);
4579 }
4580 
4581 
4582 /*
4583  * Uses just 1 pointer of the 4 available in the public struct.
4584  */
4585 if_t
4586 if_iter_start(struct if_iter *iter)
4587 {
4588 	if_t ifp;
4589 
4590 	NET_EPOCH_ASSERT();
4591 
4592 	bzero(iter, sizeof(*iter));
4593 	ifp = CK_STAILQ_FIRST(&V_ifnet);
4594 	if (ifp != NULL)
4595 		iter->context[0] = CK_STAILQ_NEXT(ifp, if_link);
4596 	else
4597 		iter->context[0] = NULL;
4598 	return (ifp);
4599 }
4600 
4601 if_t
4602 if_iter_next(struct if_iter *iter)
4603 {
4604 	if_t cur_ifp = iter->context[0];
4605 
4606 	if (cur_ifp != NULL)
4607 		iter->context[0] = CK_STAILQ_NEXT(cur_ifp, if_link);
4608 	return (cur_ifp);
4609 }
4610 
4611 void
4612 if_iter_finish(struct if_iter *iter)
4613 {
4614 	/* Nothing to do here for now. */
4615 }
4616 
4617 u_int
4618 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
4619 {
4620 	struct epoch_tracker et;
4621 	struct ifaddr *ifa;
4622 	u_int count;
4623 
4624 	MPASS(cb);
4625 
4626 	count = 0;
4627 	NET_EPOCH_ENTER(et);
4628 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4629 		if (ifa->ifa_addr->sa_family != AF_LINK)
4630 			continue;
4631 		count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr,
4632 		    count);
4633 	}
4634 	NET_EPOCH_EXIT(et);
4635 
4636 	return (count);
4637 }
4638 
4639 u_int
4640 if_llmaddr_count(if_t ifp)
4641 {
4642 	struct epoch_tracker et;
4643 	struct ifmultiaddr *ifma;
4644 	int count;
4645 
4646 	count = 0;
4647 	NET_EPOCH_ENTER(et);
4648 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
4649 		if (ifma->ifma_addr->sa_family == AF_LINK)
4650 			count++;
4651 	NET_EPOCH_EXIT(et);
4652 
4653 	return (count);
4654 }
4655 
4656 bool
4657 if_maddr_empty(if_t ifp)
4658 {
4659 
4660 	return (CK_STAILQ_EMPTY(&ifp->if_multiaddrs));
4661 }
4662 
4663 u_int
4664 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
4665 {
4666 	struct epoch_tracker et;
4667 	struct ifmultiaddr *ifma;
4668 	u_int count;
4669 
4670 	MPASS(cb);
4671 
4672 	count = 0;
4673 	NET_EPOCH_ENTER(et);
4674 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
4675 		if (ifma->ifma_addr->sa_family != AF_LINK)
4676 			continue;
4677 		count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr,
4678 		    count);
4679 	}
4680 	NET_EPOCH_EXIT(et);
4681 
4682 	return (count);
4683 }
4684 
4685 u_int
4686 if_foreach_addr_type(if_t ifp, int type, if_addr_cb_t cb, void *cb_arg)
4687 {
4688 	struct epoch_tracker et;
4689 	struct ifaddr *ifa;
4690 	u_int count;
4691 
4692 	MPASS(cb);
4693 
4694 	count = 0;
4695 	NET_EPOCH_ENTER(et);
4696 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4697 		if (ifa->ifa_addr->sa_family != type)
4698 			continue;
4699 		count += (*cb)(cb_arg, ifa, count);
4700 	}
4701 	NET_EPOCH_EXIT(et);
4702 
4703 	return (count);
4704 }
4705 
4706 struct ifaddr *
4707 ifa_iter_start(if_t ifp, struct ifa_iter *iter)
4708 {
4709 	struct ifaddr *ifa;
4710 
4711 	NET_EPOCH_ASSERT();
4712 
4713 	bzero(iter, sizeof(*iter));
4714 	ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
4715 	if (ifa != NULL)
4716 		iter->context[0] = CK_STAILQ_NEXT(ifa, ifa_link);
4717 	else
4718 		iter->context[0] = NULL;
4719 	return (ifa);
4720 }
4721 
4722 struct ifaddr *
4723 ifa_iter_next(struct ifa_iter *iter)
4724 {
4725 	struct ifaddr *ifa = iter->context[0];
4726 
4727 	if (ifa != NULL)
4728 		iter->context[0] = CK_STAILQ_NEXT(ifa, ifa_link);
4729 	return (ifa);
4730 }
4731 
4732 void
4733 ifa_iter_finish(struct ifa_iter *iter)
4734 {
4735 	/* Nothing to do here for now. */
4736 }
4737 
4738 int
4739 if_setsoftc(if_t ifp, void *softc)
4740 {
4741 	ifp->if_softc = softc;
4742 	return (0);
4743 }
4744 
4745 void *
4746 if_getsoftc(const if_t ifp)
4747 {
4748 	return (ifp->if_softc);
4749 }
4750 
4751 void
4752 if_setrcvif(struct mbuf *m, if_t ifp)
4753 {
4754 
4755 	MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
4756 	m->m_pkthdr.rcvif = (struct ifnet *)ifp;
4757 }
4758 
4759 void
4760 if_setvtag(struct mbuf *m, uint16_t tag)
4761 {
4762 	m->m_pkthdr.ether_vtag = tag;
4763 }
4764 
4765 uint16_t
4766 if_getvtag(struct mbuf *m)
4767 {
4768 	return (m->m_pkthdr.ether_vtag);
4769 }
4770 
4771 int
4772 if_sendq_empty(if_t ifp)
4773 {
4774 	return (IFQ_DRV_IS_EMPTY(&ifp->if_snd));
4775 }
4776 
4777 struct ifaddr *
4778 if_getifaddr(const if_t ifp)
4779 {
4780 	return (ifp->if_addr);
4781 }
4782 
4783 int
4784 if_getamcount(const if_t ifp)
4785 {
4786 	return (ifp->if_amcount);
4787 }
4788 
4789 int
4790 if_setsendqready(if_t ifp)
4791 {
4792 	IFQ_SET_READY(&ifp->if_snd);
4793 	return (0);
4794 }
4795 
4796 int
4797 if_setsendqlen(if_t ifp, int tx_desc_count)
4798 {
4799 	IFQ_SET_MAXLEN(&ifp->if_snd, tx_desc_count);
4800 	ifp->if_snd.ifq_drv_maxlen = tx_desc_count;
4801 	return (0);
4802 }
4803 
4804 void
4805 if_setnetmapadapter(if_t ifp, struct netmap_adapter *na)
4806 {
4807 	ifp->if_netmap = na;
4808 }
4809 
4810 struct netmap_adapter *
4811 if_getnetmapadapter(if_t ifp)
4812 {
4813 	return (ifp->if_netmap);
4814 }
4815 
4816 int
4817 if_vlantrunkinuse(if_t ifp)
4818 {
4819 	return (ifp->if_vlantrunk != NULL);
4820 }
4821 
4822 void
4823 if_init(if_t ifp, void *ctx)
4824 {
4825 	(*ifp->if_init)(ctx);
4826 }
4827 
4828 void
4829 if_input(if_t ifp, struct mbuf* sendmp)
4830 {
4831 	(*ifp->if_input)(ifp, sendmp);
4832 }
4833 
4834 int
4835 if_transmit(if_t ifp, struct mbuf *m)
4836 {
4837 	return ((*ifp->if_transmit)(ifp, m));
4838 }
4839 
4840 int
4841 if_resolvemulti(if_t ifp, struct sockaddr **srcs, struct sockaddr *dst)
4842 {
4843 	if (ifp->if_resolvemulti == NULL)
4844 		return (EOPNOTSUPP);
4845 
4846 	return (ifp->if_resolvemulti(ifp, srcs, dst));
4847 }
4848 
4849 int
4850 if_ioctl(if_t ifp, u_long cmd, void *data)
4851 {
4852 	if (ifp->if_ioctl == NULL)
4853 		return (EOPNOTSUPP);
4854 
4855 	return (ifp->if_ioctl(ifp, cmd, data));
4856 }
4857 
4858 struct mbuf *
4859 if_dequeue(if_t ifp)
4860 {
4861 	struct mbuf *m;
4862 
4863 	IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
4864 	return (m);
4865 }
4866 
4867 int
4868 if_sendq_prepend(if_t ifp, struct mbuf *m)
4869 {
4870 	IFQ_DRV_PREPEND(&ifp->if_snd, m);
4871 	return (0);
4872 }
4873 
4874 int
4875 if_setifheaderlen(if_t ifp, int len)
4876 {
4877 	ifp->if_hdrlen = len;
4878 	return (0);
4879 }
4880 
4881 caddr_t
4882 if_getlladdr(const if_t ifp)
4883 {
4884 	return (IF_LLADDR(ifp));
4885 }
4886 
4887 void *
4888 if_gethandle(u_char type)
4889 {
4890 	return (if_alloc(type));
4891 }
4892 
4893 void
4894 if_vlancap(if_t ifp)
4895 {
4896 	VLAN_CAPABILITIES(ifp);
4897 }
4898 
4899 int
4900 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax)
4901 {
4902 	ifp->if_hw_tsomax = if_hw_tsomax;
4903         return (0);
4904 }
4905 
4906 int
4907 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount)
4908 {
4909 	ifp->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount;
4910         return (0);
4911 }
4912 
4913 int
4914 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize)
4915 {
4916 	ifp->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize;
4917         return (0);
4918 }
4919 
4920 u_int
4921 if_gethwtsomax(const if_t ifp)
4922 {
4923 	return (ifp->if_hw_tsomax);
4924 }
4925 
4926 u_int
4927 if_gethwtsomaxsegcount(const if_t ifp)
4928 {
4929 	return (ifp->if_hw_tsomaxsegcount);
4930 }
4931 
4932 u_int
4933 if_gethwtsomaxsegsize(const if_t ifp)
4934 {
4935 	return (ifp->if_hw_tsomaxsegsize);
4936 }
4937 
4938 void
4939 if_setinitfn(if_t ifp, if_init_fn_t init_fn)
4940 {
4941 	ifp->if_init = init_fn;
4942 }
4943 
4944 void
4945 if_setinputfn(if_t ifp, if_input_fn_t input_fn)
4946 {
4947 	ifp->if_input = input_fn;
4948 }
4949 
4950 if_input_fn_t
4951 if_getinputfn(if_t ifp)
4952 {
4953 	return (ifp->if_input);
4954 }
4955 
4956 void
4957 if_setioctlfn(if_t ifp, if_ioctl_fn_t ioctl_fn)
4958 {
4959 	ifp->if_ioctl = ioctl_fn;
4960 }
4961 
4962 void
4963 if_setoutputfn(if_t ifp, if_output_fn_t output_fn)
4964 {
4965 	ifp->if_output = output_fn;
4966 }
4967 
4968 void
4969 if_setstartfn(if_t ifp, if_start_fn_t start_fn)
4970 {
4971 	ifp->if_start = start_fn;
4972 }
4973 
4974 if_start_fn_t
4975 if_getstartfn(if_t ifp)
4976 {
4977 	return (ifp->if_start);
4978 }
4979 
4980 void
4981 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn)
4982 {
4983 	ifp->if_transmit = start_fn;
4984 }
4985 
4986 if_transmit_fn_t
4987 if_gettransmitfn(if_t ifp)
4988 {
4989 	return (ifp->if_transmit);
4990 }
4991 
4992 void
4993 if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn)
4994 {
4995 	ifp->if_qflush = flush_fn;
4996 }
4997 
4998 void
4999 if_setsndtagallocfn(if_t ifp, if_snd_tag_alloc_t alloc_fn)
5000 {
5001 	ifp->if_snd_tag_alloc = alloc_fn;
5002 }
5003 
5004 int
5005 if_snd_tag_alloc(if_t ifp, union if_snd_tag_alloc_params *params,
5006     struct m_snd_tag **mstp)
5007 {
5008 	if (ifp->if_snd_tag_alloc == NULL)
5009 		return (EOPNOTSUPP);
5010 	return (ifp->if_snd_tag_alloc(ifp, params, mstp));
5011 }
5012 
5013 void
5014 if_setgetcounterfn(if_t ifp, if_get_counter_t fn)
5015 {
5016 	ifp->if_get_counter = fn;
5017 }
5018 
5019 void
5020 if_setreassignfn(if_t ifp, if_reassign_fn_t fn)
5021 {
5022 	ifp->if_reassign = fn;
5023 }
5024 
5025 void
5026 if_setratelimitqueryfn(if_t ifp, if_ratelimit_query_t fn)
5027 {
5028 	ifp->if_ratelimit_query = fn;
5029 }
5030 
5031 void
5032 if_setdebugnet_methods(if_t ifp, struct debugnet_methods *m)
5033 {
5034 	ifp->if_debugnet_methods = m;
5035 }
5036 
5037 struct label *
5038 if_getmaclabel(if_t ifp)
5039 {
5040 	return (ifp->if_label);
5041 }
5042 
5043 void
5044 if_setmaclabel(if_t ifp, struct label *label)
5045 {
5046 	ifp->if_label = label;
5047 }
5048 
5049 int
5050 if_gettype(if_t ifp)
5051 {
5052 	return (ifp->if_type);
5053 }
5054 
5055 void *
5056 if_getllsoftc(if_t ifp)
5057 {
5058 	return (ifp->if_llsoftc);
5059 }
5060 
5061 void
5062 if_setllsoftc(if_t ifp, void *llsoftc)
5063 {
5064 	ifp->if_llsoftc = llsoftc;
5065 };
5066 
5067 int
5068 if_getlinkstate(if_t ifp)
5069 {
5070 	return (ifp->if_link_state);
5071 }
5072 
5073 const uint8_t *
5074 if_getbroadcastaddr(if_t ifp)
5075 {
5076 	return (ifp->if_broadcastaddr);
5077 }
5078 
5079 void
5080 if_setbroadcastaddr(if_t ifp, const uint8_t *addr)
5081 {
5082 	ifp->if_broadcastaddr = addr;
5083 }
5084 
5085 int
5086 if_getnumadomain(if_t ifp)
5087 {
5088 	return (ifp->if_numa_domain);
5089 }
5090 
5091 uint64_t
5092 if_getcounter(if_t ifp, ift_counter counter)
5093 {
5094 	return (ifp->if_get_counter(ifp, counter));
5095 }
5096 
5097 bool
5098 if_altq_is_enabled(if_t ifp)
5099 {
5100 	return (ALTQ_IS_ENABLED(&ifp->if_snd));
5101 }
5102 
5103 struct vnet *
5104 if_getvnet(if_t ifp)
5105 {
5106 	return (ifp->if_vnet);
5107 }
5108 
5109 void *
5110 if_getafdata(if_t ifp, int af)
5111 {
5112 	return (ifp->if_afdata[af]);
5113 }
5114 
5115 u_int
5116 if_getfib(if_t ifp)
5117 {
5118 	return (ifp->if_fib);
5119 }
5120 
5121 uint8_t
5122 if_getaddrlen(if_t ifp)
5123 {
5124 	return (ifp->if_addrlen);
5125 }
5126 
5127 struct bpf_if *
5128 if_getbpf(if_t ifp)
5129 {
5130 	return (ifp->if_bpf);
5131 }
5132 
5133 struct ifvlantrunk *
5134 if_getvlantrunk(if_t ifp)
5135 {
5136 	return (ifp->if_vlantrunk);
5137 }
5138 
5139 uint8_t
5140 if_getpcp(if_t ifp)
5141 {
5142 	return (ifp->if_pcp);
5143 }
5144 
5145 void *
5146 if_getl2com(if_t ifp)
5147 {
5148 	return (ifp->if_l2com);
5149 }
5150 
5151 void
5152 if_setipsec_accel_methods(if_t ifp, const struct if_ipsec_accel_methods *m)
5153 {
5154 	ifp->if_ipsec_accel_m = m;
5155 }
5156 
5157 #ifdef DDB
5158 static void
5159 if_show_ifnet(struct ifnet *ifp)
5160 {
5161 	if (ifp == NULL)
5162 		return;
5163 	db_printf("%s:\n", ifp->if_xname);
5164 #define	IF_DB_PRINTF(f, e)	db_printf("   %s = " f "\n", #e, ifp->e);
5165 	IF_DB_PRINTF("%s", if_dname);
5166 	IF_DB_PRINTF("%d", if_dunit);
5167 	IF_DB_PRINTF("%s", if_description);
5168 	IF_DB_PRINTF("%u", if_index);
5169 	IF_DB_PRINTF("%d", if_idxgen);
5170 	IF_DB_PRINTF("%u", if_refcount);
5171 	IF_DB_PRINTF("%p", if_softc);
5172 	IF_DB_PRINTF("%p", if_l2com);
5173 	IF_DB_PRINTF("%p", if_llsoftc);
5174 	IF_DB_PRINTF("%d", if_amcount);
5175 	IF_DB_PRINTF("%p", if_addr);
5176 	IF_DB_PRINTF("%p", if_broadcastaddr);
5177 	IF_DB_PRINTF("%p", if_afdata);
5178 	IF_DB_PRINTF("%d", if_afdata_initialized);
5179 	IF_DB_PRINTF("%u", if_fib);
5180 	IF_DB_PRINTF("%p", if_vnet);
5181 	IF_DB_PRINTF("%p", if_home_vnet);
5182 	IF_DB_PRINTF("%p", if_vlantrunk);
5183 	IF_DB_PRINTF("%p", if_bpf);
5184 	IF_DB_PRINTF("%u", if_pcount);
5185 	IF_DB_PRINTF("%p", if_bridge);
5186 	IF_DB_PRINTF("%p", if_lagg);
5187 	IF_DB_PRINTF("%p", if_pf_kif);
5188 	IF_DB_PRINTF("%p", if_carp);
5189 	IF_DB_PRINTF("%p", if_label);
5190 	IF_DB_PRINTF("%p", if_netmap);
5191 	IF_DB_PRINTF("0x%08x", if_flags);
5192 	IF_DB_PRINTF("0x%08x", if_drv_flags);
5193 	IF_DB_PRINTF("0x%08x", if_capabilities);
5194 	IF_DB_PRINTF("0x%08x", if_capenable);
5195 	IF_DB_PRINTF("%p", if_snd.ifq_head);
5196 	IF_DB_PRINTF("%p", if_snd.ifq_tail);
5197 	IF_DB_PRINTF("%d", if_snd.ifq_len);
5198 	IF_DB_PRINTF("%d", if_snd.ifq_maxlen);
5199 	IF_DB_PRINTF("%p", if_snd.ifq_drv_head);
5200 	IF_DB_PRINTF("%p", if_snd.ifq_drv_tail);
5201 	IF_DB_PRINTF("%d", if_snd.ifq_drv_len);
5202 	IF_DB_PRINTF("%d", if_snd.ifq_drv_maxlen);
5203 	IF_DB_PRINTF("%d", if_snd.altq_type);
5204 	IF_DB_PRINTF("%x", if_snd.altq_flags);
5205 #undef IF_DB_PRINTF
5206 }
5207 
5208 DB_SHOW_COMMAND(ifnet, db_show_ifnet)
5209 {
5210 	if (!have_addr) {
5211 		db_printf("usage: show ifnet <struct ifnet *>\n");
5212 		return;
5213 	}
5214 
5215 	if_show_ifnet((struct ifnet *)addr);
5216 }
5217 
5218 DB_SHOW_ALL_COMMAND(ifnets, db_show_all_ifnets)
5219 {
5220 	struct ifnet *ifp;
5221 	u_short idx;
5222 
5223 	for (idx = 1; idx <= if_index; idx++) {
5224 		ifp = ifindex_table[idx].ife_ifnet;
5225 		if (ifp == NULL)
5226 			continue;
5227 		db_printf( "%20s ifp=%p\n", ifp->if_xname, ifp);
5228 		if (db_pager_quit)
5229 			break;
5230 	}
5231 }
5232 #endif	/* DDB */
5233