xref: /freebsd/sys/net/if.c (revision 681ce946f33e75c590e97c53076e86dff1fe8f4a)
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  *	@(#)if.c	8.5 (Berkeley) 1/9/95
33  * $FreeBSD$
34  */
35 
36 #include "opt_bpf.h"
37 #include "opt_inet6.h"
38 #include "opt_inet.h"
39 #include "opt_ddb.h"
40 
41 #include <sys/param.h>
42 #include <sys/capsicum.h>
43 #include <sys/conf.h>
44 #include <sys/eventhandler.h>
45 #include <sys/malloc.h>
46 #include <sys/domainset.h>
47 #include <sys/sbuf.h>
48 #include <sys/bus.h>
49 #include <sys/epoch.h>
50 #include <sys/mbuf.h>
51 #include <sys/systm.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/protosw.h>
57 #include <sys/kernel.h>
58 #include <sys/lock.h>
59 #include <sys/refcount.h>
60 #include <sys/module.h>
61 #include <sys/rwlock.h>
62 #include <sys/sockio.h>
63 #include <sys/syslog.h>
64 #include <sys/sysctl.h>
65 #include <sys/sysent.h>
66 #include <sys/taskqueue.h>
67 #include <sys/domain.h>
68 #include <sys/jail.h>
69 #include <sys/priv.h>
70 
71 #ifdef DDB
72 #include <ddb/ddb.h>
73 #endif
74 
75 #include <machine/stdarg.h>
76 #include <vm/uma.h>
77 
78 #include <net/bpf.h>
79 #include <net/ethernet.h>
80 #include <net/if.h>
81 #include <net/if_arp.h>
82 #include <net/if_clone.h>
83 #include <net/if_dl.h>
84 #include <net/if_types.h>
85 #include <net/if_var.h>
86 #include <net/if_media.h>
87 #include <net/if_mib.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 void	if_route(struct ifnet *, int flag, int fam);
280 static int	if_setflag(struct ifnet *, int, int, int *, int);
281 static int	if_transmit(struct ifnet *ifp, struct mbuf *m);
282 static void	if_unroute(struct ifnet *, int flag, int fam);
283 static int	if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int);
284 static void	do_link_state_change(void *, int);
285 static int	if_getgroup(struct ifgroupreq *, struct ifnet *);
286 static int	if_getgroupmembers(struct ifgroupreq *);
287 static void	if_delgroups(struct ifnet *);
288 static void	if_attach_internal(struct ifnet *, int, struct if_clone *);
289 static int	if_detach_internal(struct ifnet *, int, struct if_clone **);
290 static void	if_siocaddmulti(void *, int);
291 static void	if_link_ifnet(struct ifnet *);
292 static bool	if_unlink_ifnet(struct ifnet *, bool);
293 #ifdef VIMAGE
294 static int	if_vmove(struct ifnet *, struct vnet *);
295 #endif
296 
297 #ifdef INET6
298 /*
299  * XXX: declare here to avoid to include many inet6 related files..
300  * should be more generalized?
301  */
302 extern void	nd6_setmtu(struct ifnet *);
303 #endif
304 
305 /* ipsec helper hooks */
306 VNET_DEFINE(struct hhook_head *, ipsec_hhh_in[HHOOK_IPSEC_COUNT]);
307 VNET_DEFINE(struct hhook_head *, ipsec_hhh_out[HHOOK_IPSEC_COUNT]);
308 
309 int	ifqmaxlen = IFQ_MAXLEN;
310 VNET_DEFINE(struct ifnethead, ifnet);	/* depend on static init XXX */
311 VNET_DEFINE(struct ifgrouphead, ifg_head);
312 
313 /* Table of ifnet by index. */
314 VNET_DEFINE_STATIC(int, if_index);
315 #define	V_if_index		VNET(if_index)
316 VNET_DEFINE_STATIC(int, if_indexlim) = 8;
317 #define	V_if_indexlim		VNET(if_indexlim)
318 VNET_DEFINE_STATIC(struct ifnet **, ifindex_table);
319 #define	V_ifindex_table		VNET(ifindex_table)
320 
321 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system,
322     CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
323     "Variables global to all interfaces");
324 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount,
325     CTLFLAG_VNET | CTLFLAG_RD, &VNET_NAME(if_index), 0,
326     "Number of configured interfaces");
327 
328 /*
329  * The global network interface list (V_ifnet) and related state (such as
330  * if_index, if_indexlim, and ifindex_table) are protected by an sxlock.
331  * This may be acquired to stabilise the list, or we may rely on NET_EPOCH.
332  */
333 struct sx ifnet_sxlock;
334 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE);
335 
336 struct sx ifnet_detach_sxlock;
337 SX_SYSINIT_FLAGS(ifnet_detach, &ifnet_detach_sxlock, "ifnet_detach_sx",
338     SX_RECURSE);
339 
340 #ifdef VIMAGE
341 #define	VNET_IS_SHUTTING_DOWN(_vnet)					\
342     ((_vnet)->vnet_shutdown && (_vnet)->vnet_state < SI_SUB_VNET_DONE)
343 #endif
344 
345 static	if_com_alloc_t *if_com_alloc[256];
346 static	if_com_free_t *if_com_free[256];
347 
348 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals");
349 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
350 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
351 
352 struct ifnet *
353 ifnet_byindex(u_int idx)
354 {
355 
356 	NET_EPOCH_ASSERT();
357 
358 	if (__predict_false(idx > V_if_index))
359 		return (NULL);
360 
361 	return (ck_pr_load_ptr(&V_ifindex_table[idx]));
362 }
363 
364 struct ifnet *
365 ifnet_byindex_ref(u_int idx)
366 {
367 	struct ifnet *ifp;
368 
369 	ifp = ifnet_byindex(idx);
370 	if (ifp == NULL || (ifp->if_flags & IFF_DYING))
371 		return (NULL);
372 	if (!if_try_ref(ifp))
373 		return (NULL);
374 	return (ifp);
375 }
376 
377 /*
378  * Allocate an ifindex array entry.
379  */
380 static void
381 ifindex_alloc(struct ifnet *ifp)
382 {
383 	u_short idx;
384 
385 	IFNET_WLOCK();
386 	/*
387 	 * Try to find an empty slot below V_if_index.  If we fail, take the
388 	 * next slot.
389 	 */
390 	for (idx = 1; idx <= V_if_index; idx++) {
391 		if (V_ifindex_table[idx] == NULL)
392 			break;
393 	}
394 
395 	/* Catch if_index overflow. */
396 	if (idx >= V_if_indexlim) {
397 		struct ifnet **new, **old;
398 		int newlim;
399 
400 		newlim = V_if_indexlim * 2;
401 		new = malloc(newlim * sizeof(*new), M_IFNET, M_WAITOK | M_ZERO);
402 		memcpy(new, V_ifindex_table, V_if_indexlim * sizeof(*new));
403 		old = V_ifindex_table;
404 		ck_pr_store_ptr(&V_ifindex_table, new);
405 		V_if_indexlim = newlim;
406 		epoch_wait_preempt(net_epoch_preempt);
407 		free(old, M_IFNET);
408 	}
409 	if (idx > V_if_index)
410 		V_if_index = idx;
411 
412 	ifp->if_index = idx;
413 	ck_pr_store_ptr(&V_ifindex_table[idx], ifp);
414 	IFNET_WUNLOCK();
415 }
416 
417 static void
418 ifindex_free(u_short idx)
419 {
420 
421 	IFNET_WLOCK_ASSERT();
422 
423 	ck_pr_store_ptr(&V_ifindex_table[idx], NULL);
424 	while (V_if_index > 0 &&
425 	    V_ifindex_table[V_if_index] == NULL)
426 		V_if_index--;
427 }
428 
429 struct ifaddr *
430 ifaddr_byindex(u_short idx)
431 {
432 	struct ifnet *ifp;
433 	struct ifaddr *ifa = NULL;
434 
435 	NET_EPOCH_ASSERT();
436 
437 	ifp = ifnet_byindex(idx);
438 	if (ifp != NULL && (ifa = ifp->if_addr) != NULL)
439 		ifa_ref(ifa);
440 	return (ifa);
441 }
442 
443 /*
444  * Network interface utility routines.
445  *
446  * Routines with ifa_ifwith* names take sockaddr *'s as
447  * parameters.
448  */
449 
450 static void
451 vnet_if_init(const void *unused __unused)
452 {
453 
454 	CK_STAILQ_INIT(&V_ifnet);
455 	CK_STAILQ_INIT(&V_ifg_head);
456 	V_ifindex_table = malloc(V_if_indexlim * sizeof(*V_ifindex_table),
457 	    M_IFNET, M_WAITOK | M_ZERO);
458 	vnet_if_clone_init();
459 }
460 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init,
461     NULL);
462 
463 #ifdef VIMAGE
464 static void
465 vnet_if_uninit(const void *unused __unused)
466 {
467 
468 	VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p "
469 	    "not empty", __func__, __LINE__, &V_ifnet));
470 	VNET_ASSERT(CK_STAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p "
471 	    "not empty", __func__, __LINE__, &V_ifg_head));
472 
473 	free((caddr_t)V_ifindex_table, M_IFNET);
474 }
475 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
476     vnet_if_uninit, NULL);
477 #endif
478 
479 static void
480 if_link_ifnet(struct ifnet *ifp)
481 {
482 
483 	IFNET_WLOCK();
484 	CK_STAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link);
485 #ifdef VIMAGE
486 	curvnet->vnet_ifcnt++;
487 #endif
488 	IFNET_WUNLOCK();
489 }
490 
491 static bool
492 if_unlink_ifnet(struct ifnet *ifp, bool vmove)
493 {
494 	struct ifnet *iter;
495 	int found = 0;
496 
497 	IFNET_WLOCK();
498 	CK_STAILQ_FOREACH(iter, &V_ifnet, if_link)
499 		if (iter == ifp) {
500 			CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link);
501 			if (!vmove)
502 				ifp->if_flags |= IFF_DYING;
503 			found = 1;
504 			break;
505 		}
506 #ifdef VIMAGE
507 	curvnet->vnet_ifcnt--;
508 #endif
509 	IFNET_WUNLOCK();
510 
511 	return (found);
512 }
513 
514 #ifdef VIMAGE
515 static void
516 vnet_if_return(const void *unused __unused)
517 {
518 	struct ifnet *ifp, *nifp;
519 	struct ifnet **pending;
520 	int found __diagused;
521 	int i;
522 
523 	i = 0;
524 
525 	/*
526 	 * We need to protect our access to the V_ifnet tailq. Ordinarily we'd
527 	 * enter NET_EPOCH, but that's not possible, because if_vmove() calls
528 	 * if_detach_internal(), which waits for NET_EPOCH callbacks to
529 	 * complete. We can't do that from within NET_EPOCH.
530 	 *
531 	 * However, we can also use the IFNET_xLOCK, which is the V_ifnet
532 	 * read/write lock. We cannot hold the lock as we call if_vmove()
533 	 * though, as that presents LOR w.r.t ifnet_sx, in_multi_sx and iflib
534 	 * ctx lock.
535 	 */
536 	IFNET_WLOCK();
537 
538 	pending = malloc(sizeof(struct ifnet *) * curvnet->vnet_ifcnt,
539 	    M_IFNET, M_WAITOK | M_ZERO);
540 
541 	/* Return all inherited interfaces to their parent vnets. */
542 	CK_STAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
543 		if (ifp->if_home_vnet != ifp->if_vnet) {
544 			found = if_unlink_ifnet(ifp, true);
545 			MPASS(found);
546 
547 			pending[i++] = ifp;
548 		}
549 	}
550 	IFNET_WUNLOCK();
551 
552 	for (int j = 0; j < i; j++) {
553 		if_vmove(pending[j], pending[j]->if_home_vnet);
554 	}
555 
556 	free(pending, M_IFNET);
557 }
558 VNET_SYSUNINIT(vnet_if_return, SI_SUB_VNET_DONE, SI_ORDER_ANY,
559     vnet_if_return, NULL);
560 #endif
561 
562 /*
563  * Allocate a struct ifnet and an index for an interface.  A layer 2
564  * common structure will also be allocated if an allocation routine is
565  * registered for the passed type.
566  */
567 static struct ifnet *
568 if_alloc_domain(u_char type, int numa_domain)
569 {
570 	struct ifnet *ifp;
571 
572 	KASSERT(numa_domain <= IF_NODOM, ("numa_domain too large"));
573 	if (numa_domain == IF_NODOM)
574 		ifp = malloc(sizeof(struct ifnet), M_IFNET,
575 		    M_WAITOK | M_ZERO);
576 	else
577 		ifp = malloc_domainset(sizeof(struct ifnet), M_IFNET,
578 		    DOMAINSET_PREF(numa_domain), M_WAITOK | M_ZERO);
579 	ifp->if_type = type;
580 	ifp->if_alloctype = type;
581 	ifp->if_numa_domain = numa_domain;
582 #ifdef VIMAGE
583 	ifp->if_vnet = curvnet;
584 #endif
585 	if (if_com_alloc[type] != NULL) {
586 		ifp->if_l2com = if_com_alloc[type](type, ifp);
587 		KASSERT(ifp->if_l2com, ("%s: if_com_alloc[%u] failed", __func__,
588 		    type));
589 	}
590 
591 	IF_ADDR_LOCK_INIT(ifp);
592 	TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp);
593 	TASK_INIT(&ifp->if_addmultitask, 0, if_siocaddmulti, ifp);
594 	ifp->if_afdata_initialized = 0;
595 	IF_AFDATA_LOCK_INIT(ifp);
596 	CK_STAILQ_INIT(&ifp->if_addrhead);
597 	CK_STAILQ_INIT(&ifp->if_multiaddrs);
598 	CK_STAILQ_INIT(&ifp->if_groups);
599 #ifdef MAC
600 	mac_ifnet_init(ifp);
601 #endif
602 	ifq_init(&ifp->if_snd, ifp);
603 
604 	refcount_init(&ifp->if_refcount, 1);	/* Index reference. */
605 	for (int i = 0; i < IFCOUNTERS; i++)
606 		ifp->if_counters[i] = counter_u64_alloc(M_WAITOK);
607 	ifp->if_get_counter = if_get_counter_default;
608 	ifp->if_pcp = IFNET_PCP_NONE;
609 
610 	ifindex_alloc(ifp);
611 
612 	return (ifp);
613 }
614 
615 struct ifnet *
616 if_alloc_dev(u_char type, device_t dev)
617 {
618 	int numa_domain;
619 
620 	if (dev == NULL || bus_get_domain(dev, &numa_domain) != 0)
621 		return (if_alloc_domain(type, IF_NODOM));
622 	return (if_alloc_domain(type, numa_domain));
623 }
624 
625 struct ifnet *
626 if_alloc(u_char type)
627 {
628 
629 	return (if_alloc_domain(type, IF_NODOM));
630 }
631 /*
632  * Do the actual work of freeing a struct ifnet, and layer 2 common
633  * structure.  This call is made when the network epoch guarantees
634  * us that nobody holds a pointer to the interface.
635  */
636 static void
637 if_free_deferred(epoch_context_t ctx)
638 {
639 	struct ifnet *ifp = __containerof(ctx, struct ifnet, if_epoch_ctx);
640 
641 	KASSERT((ifp->if_flags & IFF_DYING),
642 	    ("%s: interface not dying", __func__));
643 
644 	if (if_com_free[ifp->if_alloctype] != NULL)
645 		if_com_free[ifp->if_alloctype](ifp->if_l2com,
646 		    ifp->if_alloctype);
647 
648 #ifdef MAC
649 	mac_ifnet_destroy(ifp);
650 #endif /* MAC */
651 	IF_AFDATA_DESTROY(ifp);
652 	IF_ADDR_LOCK_DESTROY(ifp);
653 	ifq_delete(&ifp->if_snd);
654 
655 	for (int i = 0; i < IFCOUNTERS; i++)
656 		counter_u64_free(ifp->if_counters[i]);
657 
658 	free(ifp->if_description, M_IFDESCR);
659 	free(ifp->if_hw_addr, M_IFADDR);
660 	free(ifp, M_IFNET);
661 }
662 
663 /*
664  * Deregister an interface and free the associated storage.
665  */
666 void
667 if_free(struct ifnet *ifp)
668 {
669 
670 	ifp->if_flags |= IFF_DYING;			/* XXX: Locking */
671 
672 	/*
673 	 * XXXGL: An interface index is really an alias to ifp pointer.
674 	 * Why would we clear the alias now, and not in the deferred
675 	 * context?  Indeed there is nothing wrong with some network
676 	 * thread obtaining ifp via ifnet_byindex() inside the network
677 	 * epoch and then dereferencing ifp while we peform if_free(),
678 	 * and after if_free() finished, too.
679 	 *
680 	 * The reason is the VIMAGE.  For some reason it was designed
681 	 * to require all sockets drained before destroying, but not all
682 	 * ifnets.  A vnet destruction calls if_vmove() on ifnet, which
683 	 * causes ID change.  But ID change and a possible misidentification
684 	 * of an ifnet later is a lesser problem, as it doesn't crash kernel.
685 	 * A worse problem is that removed interface may outlive the vnet it
686 	 * belongs too!  The if_free_deferred() would see ifp->if_vnet freed.
687 	 */
688 	CURVNET_SET_QUIET(ifp->if_vnet);
689 	IFNET_WLOCK();
690 	MPASS(V_ifindex_table[ifp->if_index] == ifp);
691 	ifindex_free(ifp->if_index);
692 	IFNET_WUNLOCK();
693 
694 	if (refcount_release(&ifp->if_refcount))
695 		NET_EPOCH_CALL(if_free_deferred, &ifp->if_epoch_ctx);
696 	CURVNET_RESTORE();
697 }
698 
699 /*
700  * Interfaces to keep an ifnet type-stable despite the possibility of the
701  * driver calling if_free().  If there are additional references, we defer
702  * freeing the underlying data structure.
703  */
704 void
705 if_ref(struct ifnet *ifp)
706 {
707 	u_int old __diagused;
708 
709 	/* We don't assert the ifnet list lock here, but arguably should. */
710 	old = refcount_acquire(&ifp->if_refcount);
711 	KASSERT(old > 0, ("%s: ifp %p has 0 refs", __func__, ifp));
712 }
713 
714 bool
715 if_try_ref(struct ifnet *ifp)
716 {
717 	NET_EPOCH_ASSERT();
718 	return (refcount_acquire_if_not_zero(&ifp->if_refcount));
719 }
720 
721 void
722 if_rele(struct ifnet *ifp)
723 {
724 
725 	if (!refcount_release(&ifp->if_refcount))
726 		return;
727 	NET_EPOCH_CALL(if_free_deferred, &ifp->if_epoch_ctx);
728 }
729 
730 void
731 ifq_init(struct ifaltq *ifq, struct ifnet *ifp)
732 {
733 
734 	mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF);
735 
736 	if (ifq->ifq_maxlen == 0)
737 		ifq->ifq_maxlen = ifqmaxlen;
738 
739 	ifq->altq_type = 0;
740 	ifq->altq_disc = NULL;
741 	ifq->altq_flags &= ALTQF_CANTCHANGE;
742 	ifq->altq_tbr  = NULL;
743 	ifq->altq_ifp  = ifp;
744 }
745 
746 void
747 ifq_delete(struct ifaltq *ifq)
748 {
749 	mtx_destroy(&ifq->ifq_mtx);
750 }
751 
752 /*
753  * Perform generic interface initialization tasks and attach the interface
754  * to the list of "active" interfaces.  If vmove flag is set on entry
755  * to if_attach_internal(), perform only a limited subset of initialization
756  * tasks, given that we are moving from one vnet to another an ifnet which
757  * has already been fully initialized.
758  *
759  * Note that if_detach_internal() removes group membership unconditionally
760  * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL.
761  * Thus, when if_vmove() is applied to a cloned interface, group membership
762  * is lost while a cloned one always joins a group whose name is
763  * ifc->ifc_name.  To recover this after if_detach_internal() and
764  * if_attach_internal(), the cloner should be specified to
765  * if_attach_internal() via ifc.  If it is non-NULL, if_attach_internal()
766  * attempts to join a group whose name is ifc->ifc_name.
767  *
768  * XXX:
769  *  - The decision to return void and thus require this function to
770  *    succeed is questionable.
771  *  - We should probably do more sanity checking.  For instance we don't
772  *    do anything to insure if_xname is unique or non-empty.
773  */
774 void
775 if_attach(struct ifnet *ifp)
776 {
777 
778 	if_attach_internal(ifp, 0, NULL);
779 }
780 
781 /*
782  * Compute the least common TSO limit.
783  */
784 void
785 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax)
786 {
787 	/*
788 	 * 1) If there is no limit currently, take the limit from
789 	 * the network adapter.
790 	 *
791 	 * 2) If the network adapter has a limit below the current
792 	 * limit, apply it.
793 	 */
794 	if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 &&
795 	    ifp->if_hw_tsomax < pmax->tsomaxbytes)) {
796 		pmax->tsomaxbytes = ifp->if_hw_tsomax;
797 	}
798 	if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 &&
799 	    ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) {
800 		pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
801 	}
802 	if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 &&
803 	    ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) {
804 		pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
805 	}
806 }
807 
808 /*
809  * Update TSO limit of a network adapter.
810  *
811  * Returns zero if no change. Else non-zero.
812  */
813 int
814 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax)
815 {
816 	int retval = 0;
817 	if (ifp->if_hw_tsomax != pmax->tsomaxbytes) {
818 		ifp->if_hw_tsomax = pmax->tsomaxbytes;
819 		retval++;
820 	}
821 	if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) {
822 		ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize;
823 		retval++;
824 	}
825 	if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) {
826 		ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount;
827 		retval++;
828 	}
829 	return (retval);
830 }
831 
832 static void
833 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc)
834 {
835 	unsigned socksize, ifasize;
836 	int namelen, masklen;
837 	struct sockaddr_dl *sdl;
838 	struct ifaddr *ifa;
839 
840 	MPASS(V_ifindex_table[ifp->if_index] == ifp);
841 
842 #ifdef VIMAGE
843 	ifp->if_vnet = curvnet;
844 	if (ifp->if_home_vnet == NULL)
845 		ifp->if_home_vnet = curvnet;
846 #endif
847 
848 	if_addgroup(ifp, IFG_ALL);
849 
850 	/* Restore group membership for cloned interfaces. */
851 	if (vmove && ifc != NULL)
852 		if_clone_addgroup(ifp, ifc);
853 
854 	getmicrotime(&ifp->if_lastchange);
855 	ifp->if_epoch = time_uptime;
856 
857 	KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) ||
858 	    (ifp->if_transmit != NULL && ifp->if_qflush != NULL),
859 	    ("transmit and qflush must both either be set or both be NULL"));
860 	if (ifp->if_transmit == NULL) {
861 		ifp->if_transmit = if_transmit;
862 		ifp->if_qflush = if_qflush;
863 	}
864 	if (ifp->if_input == NULL)
865 		ifp->if_input = if_input_default;
866 
867 	if (ifp->if_requestencap == NULL)
868 		ifp->if_requestencap = if_requestencap_default;
869 
870 	if (!vmove) {
871 #ifdef MAC
872 		mac_ifnet_create(ifp);
873 #endif
874 
875 		/*
876 		 * Create a Link Level name for this device.
877 		 */
878 		namelen = strlen(ifp->if_xname);
879 		/*
880 		 * Always save enough space for any possiable name so we
881 		 * can do a rename in place later.
882 		 */
883 		masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ;
884 		socksize = masklen + ifp->if_addrlen;
885 		if (socksize < sizeof(*sdl))
886 			socksize = sizeof(*sdl);
887 		socksize = roundup2(socksize, sizeof(long));
888 		ifasize = sizeof(*ifa) + 2 * socksize;
889 		ifa = ifa_alloc(ifasize, M_WAITOK);
890 		sdl = (struct sockaddr_dl *)(ifa + 1);
891 		sdl->sdl_len = socksize;
892 		sdl->sdl_family = AF_LINK;
893 		bcopy(ifp->if_xname, sdl->sdl_data, namelen);
894 		sdl->sdl_nlen = namelen;
895 		sdl->sdl_index = ifp->if_index;
896 		sdl->sdl_type = ifp->if_type;
897 		ifp->if_addr = ifa;
898 		ifa->ifa_ifp = ifp;
899 		ifa->ifa_addr = (struct sockaddr *)sdl;
900 		sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
901 		ifa->ifa_netmask = (struct sockaddr *)sdl;
902 		sdl->sdl_len = masklen;
903 		while (namelen != 0)
904 			sdl->sdl_data[--namelen] = 0xff;
905 		CK_STAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
906 		/* Reliably crash if used uninitialized. */
907 		ifp->if_broadcastaddr = NULL;
908 
909 		if (ifp->if_type == IFT_ETHER) {
910 			ifp->if_hw_addr = malloc(ifp->if_addrlen, M_IFADDR,
911 			    M_WAITOK | M_ZERO);
912 		}
913 
914 #if defined(INET) || defined(INET6)
915 		/* Use defaults for TSO, if nothing is set */
916 		if (ifp->if_hw_tsomax == 0 &&
917 		    ifp->if_hw_tsomaxsegcount == 0 &&
918 		    ifp->if_hw_tsomaxsegsize == 0) {
919 			/*
920 			 * The TSO defaults needs to be such that an
921 			 * NFS mbuf list of 35 mbufs totalling just
922 			 * below 64K works and that a chain of mbufs
923 			 * can be defragged into at most 32 segments:
924 			 */
925 			ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) -
926 			    (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
927 			ifp->if_hw_tsomaxsegcount = 35;
928 			ifp->if_hw_tsomaxsegsize = 2048;	/* 2K */
929 
930 			/* XXX some drivers set IFCAP_TSO after ethernet attach */
931 			if (ifp->if_capabilities & IFCAP_TSO) {
932 				if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n",
933 				    ifp->if_hw_tsomax,
934 				    ifp->if_hw_tsomaxsegcount,
935 				    ifp->if_hw_tsomaxsegsize);
936 			}
937 		}
938 #endif
939 	}
940 #ifdef VIMAGE
941 	else {
942 		/*
943 		 * Update the interface index in the link layer address
944 		 * of the interface.
945 		 */
946 		for (ifa = ifp->if_addr; ifa != NULL;
947 		    ifa = CK_STAILQ_NEXT(ifa, ifa_link)) {
948 			if (ifa->ifa_addr->sa_family == AF_LINK) {
949 				sdl = (struct sockaddr_dl *)ifa->ifa_addr;
950 				sdl->sdl_index = ifp->if_index;
951 			}
952 		}
953 	}
954 #endif
955 
956 	if_link_ifnet(ifp);
957 
958 	if (domain_init_status >= 2)
959 		if_attachdomain1(ifp);
960 
961 	EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
962 	if (IS_DEFAULT_VNET(curvnet))
963 		devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
964 
965 	/* Announce the interface. */
966 	rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
967 }
968 
969 static void
970 if_epochalloc(void *dummy __unused)
971 {
972 
973 	net_epoch_preempt = epoch_alloc("Net preemptible", EPOCH_PREEMPT);
974 }
975 SYSINIT(ifepochalloc, SI_SUB_EPOCH, SI_ORDER_ANY, if_epochalloc, NULL);
976 
977 static void
978 if_attachdomain(void *dummy)
979 {
980 	struct ifnet *ifp;
981 
982 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link)
983 		if_attachdomain1(ifp);
984 }
985 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND,
986     if_attachdomain, NULL);
987 
988 static void
989 if_attachdomain1(struct ifnet *ifp)
990 {
991 	struct domain *dp;
992 
993 	/*
994 	 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
995 	 * cannot lock ifp->if_afdata initialization, entirely.
996 	 */
997 	IF_AFDATA_LOCK(ifp);
998 	if (ifp->if_afdata_initialized >= domain_init_status) {
999 		IF_AFDATA_UNLOCK(ifp);
1000 		log(LOG_WARNING, "%s called more than once on %s\n",
1001 		    __func__, ifp->if_xname);
1002 		return;
1003 	}
1004 	ifp->if_afdata_initialized = domain_init_status;
1005 	IF_AFDATA_UNLOCK(ifp);
1006 
1007 	/* address family dependent data region */
1008 	bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
1009 	for (dp = domains; dp; dp = dp->dom_next) {
1010 		if (dp->dom_ifattach)
1011 			ifp->if_afdata[dp->dom_family] =
1012 			    (*dp->dom_ifattach)(ifp);
1013 	}
1014 }
1015 
1016 /*
1017  * Remove any unicast or broadcast network addresses from an interface.
1018  */
1019 void
1020 if_purgeaddrs(struct ifnet *ifp)
1021 {
1022 	struct ifaddr *ifa;
1023 
1024 	while (1) {
1025 		struct epoch_tracker et;
1026 
1027 		NET_EPOCH_ENTER(et);
1028 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1029 			if (ifa->ifa_addr->sa_family != AF_LINK)
1030 				break;
1031 		}
1032 		NET_EPOCH_EXIT(et);
1033 
1034 		if (ifa == NULL)
1035 			break;
1036 #ifdef INET
1037 		/* XXX: Ugly!! ad hoc just for INET */
1038 		if (ifa->ifa_addr->sa_family == AF_INET) {
1039 			struct ifaliasreq ifr;
1040 
1041 			bzero(&ifr, sizeof(ifr));
1042 			ifr.ifra_addr = *ifa->ifa_addr;
1043 			if (ifa->ifa_dstaddr)
1044 				ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
1045 			if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
1046 			    NULL) == 0)
1047 				continue;
1048 		}
1049 #endif /* INET */
1050 #ifdef INET6
1051 		if (ifa->ifa_addr->sa_family == AF_INET6) {
1052 			in6_purgeifaddr((struct in6_ifaddr *)ifa);
1053 			/* ifp_addrhead is already updated */
1054 			continue;
1055 		}
1056 #endif /* INET6 */
1057 		IF_ADDR_WLOCK(ifp);
1058 		CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
1059 		IF_ADDR_WUNLOCK(ifp);
1060 		ifa_free(ifa);
1061 	}
1062 }
1063 
1064 /*
1065  * Remove any multicast network addresses from an interface when an ifnet
1066  * is going away.
1067  */
1068 static void
1069 if_purgemaddrs(struct ifnet *ifp)
1070 {
1071 	struct ifmultiaddr *ifma;
1072 
1073 	IF_ADDR_WLOCK(ifp);
1074 	while (!CK_STAILQ_EMPTY(&ifp->if_multiaddrs)) {
1075 		ifma = CK_STAILQ_FIRST(&ifp->if_multiaddrs);
1076 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
1077 		if_delmulti_locked(ifp, ifma, 1);
1078 	}
1079 	IF_ADDR_WUNLOCK(ifp);
1080 }
1081 
1082 /*
1083  * Detach an interface, removing it from the list of "active" interfaces.
1084  * If vmove flag is set on entry to if_detach_internal(), perform only a
1085  * limited subset of cleanup tasks, given that we are moving an ifnet from
1086  * one vnet to another, where it must be fully operational.
1087  *
1088  * XXXRW: There are some significant questions about event ordering, and
1089  * how to prevent things from starting to use the interface during detach.
1090  */
1091 void
1092 if_detach(struct ifnet *ifp)
1093 {
1094 	bool found;
1095 
1096 	CURVNET_SET_QUIET(ifp->if_vnet);
1097 	found = if_unlink_ifnet(ifp, false);
1098 	if (found) {
1099 		sx_xlock(&ifnet_detach_sxlock);
1100 		if_detach_internal(ifp, 0, NULL);
1101 		sx_xunlock(&ifnet_detach_sxlock);
1102 	}
1103 	CURVNET_RESTORE();
1104 }
1105 
1106 /*
1107  * The vmove flag, if set, indicates that we are called from a callpath
1108  * that is moving an interface to a different vnet instance.
1109  *
1110  * The shutdown flag, if set, indicates that we are called in the
1111  * process of shutting down a vnet instance.  Currently only the
1112  * vnet_if_return SYSUNINIT function sets it.  Note: we can be called
1113  * on a vnet instance shutdown without this flag being set, e.g., when
1114  * the cloned interfaces are destoyed as first thing of teardown.
1115  */
1116 static int
1117 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp)
1118 {
1119 	struct ifaddr *ifa;
1120 	int i;
1121 	struct domain *dp;
1122 #ifdef VIMAGE
1123 	bool shutdown;
1124 
1125 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1126 #endif
1127 
1128 	/*
1129 	 * At this point we know the interface still was on the ifnet list
1130 	 * and we removed it so we are in a stable state.
1131 	 */
1132 	epoch_wait_preempt(net_epoch_preempt);
1133 
1134 	/*
1135 	 * Ensure all pending EPOCH(9) callbacks have been executed. This
1136 	 * fixes issues about late destruction of multicast options
1137 	 * which lead to leave group calls, which in turn access the
1138 	 * belonging ifnet structure:
1139 	 */
1140 	epoch_drain_callbacks(net_epoch_preempt);
1141 
1142 	/*
1143 	 * In any case (destroy or vmove) detach us from the groups
1144 	 * and remove/wait for pending events on the taskq.
1145 	 * XXX-BZ in theory an interface could still enqueue a taskq change?
1146 	 */
1147 	if_delgroups(ifp);
1148 
1149 	taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
1150 	taskqueue_drain(taskqueue_swi, &ifp->if_addmultitask);
1151 
1152 	/*
1153 	 * Check if this is a cloned interface or not. Must do even if
1154 	 * shutting down as a if_vmove_reclaim() would move the ifp and
1155 	 * the if_clone_addgroup() will have a corrupted string overwise
1156 	 * from a gibberish pointer.
1157 	 */
1158 	if (vmove && ifcp != NULL)
1159 		*ifcp = if_clone_findifc(ifp);
1160 
1161 	if_down(ifp);
1162 
1163 #ifdef VIMAGE
1164 	/*
1165 	 * On VNET shutdown abort here as the stack teardown will do all
1166 	 * the work top-down for us.
1167 	 */
1168 	if (shutdown) {
1169 		/* Give interface users the chance to clean up. */
1170 		EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1171 
1172 		/*
1173 		 * In case of a vmove we are done here without error.
1174 		 * If we would signal an error it would lead to the same
1175 		 * abort as if we did not find the ifnet anymore.
1176 		 * if_detach() calls us in void context and does not care
1177 		 * about an early abort notification, so life is splendid :)
1178 		 */
1179 		goto finish_vnet_shutdown;
1180 	}
1181 #endif
1182 
1183 	/*
1184 	 * At this point we are not tearing down a VNET and are either
1185 	 * going to destroy or vmove the interface and have to cleanup
1186 	 * accordingly.
1187 	 */
1188 
1189 	/*
1190 	 * Remove routes and flush queues.
1191 	 */
1192 #ifdef ALTQ
1193 	if (ALTQ_IS_ENABLED(&ifp->if_snd))
1194 		altq_disable(&ifp->if_snd);
1195 	if (ALTQ_IS_ATTACHED(&ifp->if_snd))
1196 		altq_detach(&ifp->if_snd);
1197 #endif
1198 
1199 	if_purgeaddrs(ifp);
1200 
1201 #ifdef INET
1202 	in_ifdetach(ifp);
1203 #endif
1204 
1205 #ifdef INET6
1206 	/*
1207 	 * Remove all IPv6 kernel structs related to ifp.  This should be done
1208 	 * before removing routing entries below, since IPv6 interface direct
1209 	 * routes are expected to be removed by the IPv6-specific kernel API.
1210 	 * Otherwise, the kernel will detect some inconsistency and bark it.
1211 	 */
1212 	in6_ifdetach(ifp);
1213 #endif
1214 	if_purgemaddrs(ifp);
1215 
1216 	/* Announce that the interface is gone. */
1217 	rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1218 	EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
1219 	if (IS_DEFAULT_VNET(curvnet))
1220 		devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
1221 
1222 	if (!vmove) {
1223 		/*
1224 		 * Prevent further calls into the device driver via ifnet.
1225 		 */
1226 		if_dead(ifp);
1227 
1228 		/*
1229 		 * Clean up all addresses.
1230 		 */
1231 		IF_ADDR_WLOCK(ifp);
1232 		if (!CK_STAILQ_EMPTY(&ifp->if_addrhead)) {
1233 			ifa = CK_STAILQ_FIRST(&ifp->if_addrhead);
1234 			CK_STAILQ_REMOVE(&ifp->if_addrhead, ifa, ifaddr, ifa_link);
1235 			IF_ADDR_WUNLOCK(ifp);
1236 			ifa_free(ifa);
1237 		} else
1238 			IF_ADDR_WUNLOCK(ifp);
1239 	}
1240 
1241 	rt_flushifroutes(ifp);
1242 
1243 #ifdef VIMAGE
1244 finish_vnet_shutdown:
1245 #endif
1246 	/*
1247 	 * We cannot hold the lock over dom_ifdetach calls as they might
1248 	 * sleep, for example trying to drain a callout, thus open up the
1249 	 * theoretical race with re-attaching.
1250 	 */
1251 	IF_AFDATA_LOCK(ifp);
1252 	i = ifp->if_afdata_initialized;
1253 	ifp->if_afdata_initialized = 0;
1254 	IF_AFDATA_UNLOCK(ifp);
1255 	for (dp = domains; i > 0 && dp; dp = dp->dom_next) {
1256 		if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) {
1257 			(*dp->dom_ifdetach)(ifp,
1258 			    ifp->if_afdata[dp->dom_family]);
1259 			ifp->if_afdata[dp->dom_family] = NULL;
1260 		}
1261 	}
1262 
1263 	return (0);
1264 }
1265 
1266 #ifdef VIMAGE
1267 /*
1268  * if_vmove() performs a limited version of if_detach() in current
1269  * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg.
1270  */
1271 static int
1272 if_vmove(struct ifnet *ifp, struct vnet *new_vnet)
1273 {
1274 	struct if_clone *ifc;
1275 #ifdef DEV_BPF
1276 	u_int bif_dlt, bif_hdrlen;
1277 #endif
1278 	int rc;
1279 
1280 #ifdef DEV_BPF
1281  	/*
1282 	 * if_detach_internal() will call the eventhandler to notify
1283 	 * interface departure.  That will detach if_bpf.  We need to
1284 	 * safe the dlt and hdrlen so we can re-attach it later.
1285 	 */
1286 	bpf_get_bp_params(ifp->if_bpf, &bif_dlt, &bif_hdrlen);
1287 #endif
1288 
1289 	/*
1290 	 * Detach from current vnet, but preserve LLADDR info, do not
1291 	 * mark as dead etc. so that the ifnet can be reattached later.
1292 	 * If we cannot find it, we lost the race to someone else.
1293 	 */
1294 	rc = if_detach_internal(ifp, 1, &ifc);
1295 	if (rc != 0)
1296 		return (rc);
1297 
1298 	/*
1299 	 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink
1300 	 * the if_index for that vnet if possible.
1301 	 *
1302 	 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized,
1303 	 * or we'd lock on one vnet and unlock on another.
1304 	 */
1305 	IFNET_WLOCK();
1306 	ifindex_free(ifp->if_index);
1307 	IFNET_WUNLOCK();
1308 
1309 	/*
1310 	 * Perform interface-specific reassignment tasks, if provided by
1311 	 * the driver.
1312 	 */
1313 	if (ifp->if_reassign != NULL)
1314 		ifp->if_reassign(ifp, new_vnet, NULL);
1315 
1316 	/*
1317 	 * Switch to the context of the target vnet.
1318 	 */
1319 	CURVNET_SET_QUIET(new_vnet);
1320 	ifindex_alloc(ifp);
1321 	if_attach_internal(ifp, 1, ifc);
1322 
1323 #ifdef DEV_BPF
1324 	if (ifp->if_bpf == NULL)
1325 		bpfattach(ifp, bif_dlt, bif_hdrlen);
1326 #endif
1327 
1328 	CURVNET_RESTORE();
1329 	return (0);
1330 }
1331 
1332 /*
1333  * Move an ifnet to or from another child prison/vnet, specified by the jail id.
1334  */
1335 static int
1336 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
1337 {
1338 	struct prison *pr;
1339 	struct ifnet *difp;
1340 	int error;
1341 	bool found __diagused;
1342 	bool shutdown;
1343 
1344 	/* Try to find the prison within our visibility. */
1345 	sx_slock(&allprison_lock);
1346 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1347 	sx_sunlock(&allprison_lock);
1348 	if (pr == NULL)
1349 		return (ENXIO);
1350 	prison_hold_locked(pr);
1351 	mtx_unlock(&pr->pr_mtx);
1352 
1353 	/* Do not try to move the iface from and to the same prison. */
1354 	if (pr->pr_vnet == ifp->if_vnet) {
1355 		prison_free(pr);
1356 		return (EEXIST);
1357 	}
1358 
1359 	/* Make sure the named iface does not exists in the dst. prison/vnet. */
1360 	/* XXX Lock interfaces to avoid races. */
1361 	CURVNET_SET_QUIET(pr->pr_vnet);
1362 	difp = ifunit(ifname);
1363 	if (difp != NULL) {
1364 		CURVNET_RESTORE();
1365 		prison_free(pr);
1366 		return (EEXIST);
1367 	}
1368 
1369 	/* Make sure the VNET is stable. */
1370 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1371 	if (shutdown) {
1372 		CURVNET_RESTORE();
1373 		prison_free(pr);
1374 		return (EBUSY);
1375 	}
1376 	CURVNET_RESTORE();
1377 
1378 	found = if_unlink_ifnet(ifp, true);
1379 	MPASS(found);
1380 
1381 	/* Move the interface into the child jail/vnet. */
1382 	error = if_vmove(ifp, pr->pr_vnet);
1383 
1384 	/* Report the new if_xname back to the userland on success. */
1385 	if (error == 0)
1386 		sprintf(ifname, "%s", ifp->if_xname);
1387 
1388 	prison_free(pr);
1389 	return (error);
1390 }
1391 
1392 static int
1393 if_vmove_reclaim(struct thread *td, char *ifname, int jid)
1394 {
1395 	struct prison *pr;
1396 	struct vnet *vnet_dst;
1397 	struct ifnet *ifp;
1398 	int error, found __diagused;
1399  	bool shutdown;
1400 
1401 	/* Try to find the prison within our visibility. */
1402 	sx_slock(&allprison_lock);
1403 	pr = prison_find_child(td->td_ucred->cr_prison, jid);
1404 	sx_sunlock(&allprison_lock);
1405 	if (pr == NULL)
1406 		return (ENXIO);
1407 	prison_hold_locked(pr);
1408 	mtx_unlock(&pr->pr_mtx);
1409 
1410 	/* Make sure the named iface exists in the source prison/vnet. */
1411 	CURVNET_SET(pr->pr_vnet);
1412 	ifp = ifunit(ifname);		/* XXX Lock to avoid races. */
1413 	if (ifp == NULL) {
1414 		CURVNET_RESTORE();
1415 		prison_free(pr);
1416 		return (ENXIO);
1417 	}
1418 
1419 	/* Do not try to move the iface from and to the same prison. */
1420 	vnet_dst = TD_TO_VNET(td);
1421 	if (vnet_dst == ifp->if_vnet) {
1422 		CURVNET_RESTORE();
1423 		prison_free(pr);
1424 		return (EEXIST);
1425 	}
1426 
1427 	/* Make sure the VNET is stable. */
1428 	shutdown = VNET_IS_SHUTTING_DOWN(ifp->if_vnet);
1429 	if (shutdown) {
1430 		CURVNET_RESTORE();
1431 		prison_free(pr);
1432 		return (EBUSY);
1433 	}
1434 
1435 	/* Get interface back from child jail/vnet. */
1436 	found = if_unlink_ifnet(ifp, true);
1437 	MPASS(found);
1438 	error = if_vmove(ifp, vnet_dst);
1439 	CURVNET_RESTORE();
1440 
1441 	/* Report the new if_xname back to the userland on success. */
1442 	if (error == 0)
1443 		sprintf(ifname, "%s", ifp->if_xname);
1444 
1445 	prison_free(pr);
1446 	return (error);
1447 }
1448 #endif /* VIMAGE */
1449 
1450 /*
1451  * Add a group to an interface
1452  */
1453 int
1454 if_addgroup(struct ifnet *ifp, const char *groupname)
1455 {
1456 	struct ifg_list		*ifgl;
1457 	struct ifg_group	*ifg = NULL;
1458 	struct ifg_member	*ifgm;
1459 	int 			 new = 0;
1460 
1461 	if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
1462 	    groupname[strlen(groupname) - 1] <= '9')
1463 		return (EINVAL);
1464 
1465 	IFNET_WLOCK();
1466 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1467 		if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) {
1468 			IFNET_WUNLOCK();
1469 			return (EEXIST);
1470 		}
1471 
1472 	if ((ifgl = malloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) {
1473 	    	IFNET_WUNLOCK();
1474 		return (ENOMEM);
1475 	}
1476 
1477 	if ((ifgm = malloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) {
1478 		free(ifgl, M_TEMP);
1479 		IFNET_WUNLOCK();
1480 		return (ENOMEM);
1481 	}
1482 
1483 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1484 		if (!strcmp(ifg->ifg_group, groupname))
1485 			break;
1486 
1487 	if (ifg == NULL) {
1488 		if ((ifg = malloc(sizeof(*ifg), M_TEMP, M_NOWAIT)) == NULL) {
1489 			free(ifgl, M_TEMP);
1490 			free(ifgm, M_TEMP);
1491 			IFNET_WUNLOCK();
1492 			return (ENOMEM);
1493 		}
1494 		strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
1495 		ifg->ifg_refcnt = 0;
1496 		CK_STAILQ_INIT(&ifg->ifg_members);
1497 		CK_STAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next);
1498 		new = 1;
1499 	}
1500 
1501 	ifg->ifg_refcnt++;
1502 	ifgl->ifgl_group = ifg;
1503 	ifgm->ifgm_ifp = ifp;
1504 
1505 	IF_ADDR_WLOCK(ifp);
1506 	CK_STAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
1507 	CK_STAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
1508 	IF_ADDR_WUNLOCK(ifp);
1509 
1510 	IFNET_WUNLOCK();
1511 
1512 	if (new)
1513 		EVENTHANDLER_INVOKE(group_attach_event, ifg);
1514 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1515 
1516 	return (0);
1517 }
1518 
1519 /*
1520  * Helper function to remove a group out of an interface.  Expects the global
1521  * ifnet lock to be write-locked, and drops it before returning.
1522  */
1523 static void
1524 _if_delgroup_locked(struct ifnet *ifp, struct ifg_list *ifgl,
1525     const char *groupname)
1526 {
1527 	struct ifg_member *ifgm;
1528 	bool freeifgl;
1529 
1530 	IFNET_WLOCK_ASSERT();
1531 
1532 	IF_ADDR_WLOCK(ifp);
1533 	CK_STAILQ_REMOVE(&ifp->if_groups, ifgl, ifg_list, ifgl_next);
1534 	IF_ADDR_WUNLOCK(ifp);
1535 
1536 	CK_STAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) {
1537 		if (ifgm->ifgm_ifp == ifp) {
1538 			CK_STAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm,
1539 			    ifg_member, ifgm_next);
1540 			break;
1541 		}
1542 	}
1543 
1544 	if (--ifgl->ifgl_group->ifg_refcnt == 0) {
1545 		CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group,
1546 		    ifg_next);
1547 		freeifgl = true;
1548 	} else {
1549 		freeifgl = false;
1550 	}
1551 	IFNET_WUNLOCK();
1552 
1553 	epoch_wait_preempt(net_epoch_preempt);
1554 	if (freeifgl) {
1555 		EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group);
1556 		free(ifgl->ifgl_group, M_TEMP);
1557 	}
1558 	free(ifgm, M_TEMP);
1559 	free(ifgl, M_TEMP);
1560 
1561 	EVENTHANDLER_INVOKE(group_change_event, groupname);
1562 }
1563 
1564 /*
1565  * Remove a group from an interface
1566  */
1567 int
1568 if_delgroup(struct ifnet *ifp, const char *groupname)
1569 {
1570 	struct ifg_list *ifgl;
1571 
1572 	IFNET_WLOCK();
1573 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1574 		if (strcmp(ifgl->ifgl_group->ifg_group, groupname) == 0)
1575 			break;
1576 	if (ifgl == NULL) {
1577 		IFNET_WUNLOCK();
1578 		return (ENOENT);
1579 	}
1580 
1581 	_if_delgroup_locked(ifp, ifgl, groupname);
1582 
1583 	return (0);
1584 }
1585 
1586 /*
1587  * Remove an interface from all groups
1588  */
1589 static void
1590 if_delgroups(struct ifnet *ifp)
1591 {
1592 	struct ifg_list *ifgl;
1593 	char groupname[IFNAMSIZ];
1594 
1595 	IFNET_WLOCK();
1596 	while ((ifgl = CK_STAILQ_FIRST(&ifp->if_groups)) != NULL) {
1597 		strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ);
1598 		_if_delgroup_locked(ifp, ifgl, groupname);
1599 		IFNET_WLOCK();
1600 	}
1601 	IFNET_WUNLOCK();
1602 }
1603 
1604 /*
1605  * Stores all groups from an interface in memory pointed to by ifgr.
1606  */
1607 static int
1608 if_getgroup(struct ifgroupreq *ifgr, struct ifnet *ifp)
1609 {
1610 	int			 len, error;
1611 	struct ifg_list		*ifgl;
1612 	struct ifg_req		 ifgrq, *ifgp;
1613 
1614 	NET_EPOCH_ASSERT();
1615 
1616 	if (ifgr->ifgr_len == 0) {
1617 		CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
1618 			ifgr->ifgr_len += sizeof(struct ifg_req);
1619 		return (0);
1620 	}
1621 
1622 	len = ifgr->ifgr_len;
1623 	ifgp = ifgr->ifgr_groups;
1624 	/* XXX: wire */
1625 	CK_STAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
1626 		if (len < sizeof(ifgrq))
1627 			return (EINVAL);
1628 		bzero(&ifgrq, sizeof ifgrq);
1629 		strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
1630 		    sizeof(ifgrq.ifgrq_group));
1631 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req))))
1632 			return (error);
1633 		len -= sizeof(ifgrq);
1634 		ifgp++;
1635 	}
1636 
1637 	return (0);
1638 }
1639 
1640 /*
1641  * Stores all members of a group in memory pointed to by igfr
1642  */
1643 static int
1644 if_getgroupmembers(struct ifgroupreq *ifgr)
1645 {
1646 	struct ifg_group	*ifg;
1647 	struct ifg_member	*ifgm;
1648 	struct ifg_req		 ifgrq, *ifgp;
1649 	int			 len, error;
1650 
1651 	IFNET_RLOCK();
1652 	CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
1653 		if (strcmp(ifg->ifg_group, ifgr->ifgr_name) == 0)
1654 			break;
1655 	if (ifg == NULL) {
1656 		IFNET_RUNLOCK();
1657 		return (ENOENT);
1658 	}
1659 
1660 	if (ifgr->ifgr_len == 0) {
1661 		CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
1662 			ifgr->ifgr_len += sizeof(ifgrq);
1663 		IFNET_RUNLOCK();
1664 		return (0);
1665 	}
1666 
1667 	len = ifgr->ifgr_len;
1668 	ifgp = ifgr->ifgr_groups;
1669 	CK_STAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
1670 		if (len < sizeof(ifgrq)) {
1671 			IFNET_RUNLOCK();
1672 			return (EINVAL);
1673 		}
1674 		bzero(&ifgrq, sizeof ifgrq);
1675 		strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
1676 		    sizeof(ifgrq.ifgrq_member));
1677 		if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) {
1678 			IFNET_RUNLOCK();
1679 			return (error);
1680 		}
1681 		len -= sizeof(ifgrq);
1682 		ifgp++;
1683 	}
1684 	IFNET_RUNLOCK();
1685 
1686 	return (0);
1687 }
1688 
1689 /*
1690  * Return counter values from counter(9)s stored in ifnet.
1691  */
1692 uint64_t
1693 if_get_counter_default(struct ifnet *ifp, ift_counter cnt)
1694 {
1695 
1696 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1697 
1698 	return (counter_u64_fetch(ifp->if_counters[cnt]));
1699 }
1700 
1701 /*
1702  * Increase an ifnet counter. Usually used for counters shared
1703  * between the stack and a driver, but function supports them all.
1704  */
1705 void
1706 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc)
1707 {
1708 
1709 	KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt));
1710 
1711 	counter_u64_add(ifp->if_counters[cnt], inc);
1712 }
1713 
1714 /*
1715  * Copy data from ifnet to userland API structure if_data.
1716  */
1717 void
1718 if_data_copy(struct ifnet *ifp, struct if_data *ifd)
1719 {
1720 
1721 	ifd->ifi_type = ifp->if_type;
1722 	ifd->ifi_physical = 0;
1723 	ifd->ifi_addrlen = ifp->if_addrlen;
1724 	ifd->ifi_hdrlen = ifp->if_hdrlen;
1725 	ifd->ifi_link_state = ifp->if_link_state;
1726 	ifd->ifi_vhid = 0;
1727 	ifd->ifi_datalen = sizeof(struct if_data);
1728 	ifd->ifi_mtu = ifp->if_mtu;
1729 	ifd->ifi_metric = ifp->if_metric;
1730 	ifd->ifi_baudrate = ifp->if_baudrate;
1731 	ifd->ifi_hwassist = ifp->if_hwassist;
1732 	ifd->ifi_epoch = ifp->if_epoch;
1733 	ifd->ifi_lastchange = ifp->if_lastchange;
1734 
1735 	ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS);
1736 	ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS);
1737 	ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS);
1738 	ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS);
1739 	ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS);
1740 	ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES);
1741 	ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES);
1742 	ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS);
1743 	ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS);
1744 	ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS);
1745 	ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
1746 	ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO);
1747 }
1748 
1749 /*
1750  * Initialization, destruction and refcounting functions for ifaddrs.
1751  */
1752 struct ifaddr *
1753 ifa_alloc(size_t size, int flags)
1754 {
1755 	struct ifaddr *ifa;
1756 
1757 	KASSERT(size >= sizeof(struct ifaddr),
1758 	    ("%s: invalid size %zu", __func__, size));
1759 
1760 	ifa = malloc(size, M_IFADDR, M_ZERO | flags);
1761 	if (ifa == NULL)
1762 		return (NULL);
1763 
1764 	if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL)
1765 		goto fail;
1766 	if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL)
1767 		goto fail;
1768 	if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL)
1769 		goto fail;
1770 	if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL)
1771 		goto fail;
1772 
1773 	refcount_init(&ifa->ifa_refcnt, 1);
1774 
1775 	return (ifa);
1776 
1777 fail:
1778 	/* free(NULL) is okay */
1779 	counter_u64_free(ifa->ifa_opackets);
1780 	counter_u64_free(ifa->ifa_ipackets);
1781 	counter_u64_free(ifa->ifa_obytes);
1782 	counter_u64_free(ifa->ifa_ibytes);
1783 	free(ifa, M_IFADDR);
1784 
1785 	return (NULL);
1786 }
1787 
1788 void
1789 ifa_ref(struct ifaddr *ifa)
1790 {
1791 	u_int old __diagused;
1792 
1793 	old = refcount_acquire(&ifa->ifa_refcnt);
1794 	KASSERT(old > 0, ("%s: ifa %p has 0 refs", __func__, ifa));
1795 }
1796 
1797 int
1798 ifa_try_ref(struct ifaddr *ifa)
1799 {
1800 
1801 	NET_EPOCH_ASSERT();
1802 	return (refcount_acquire_if_not_zero(&ifa->ifa_refcnt));
1803 }
1804 
1805 static void
1806 ifa_destroy(epoch_context_t ctx)
1807 {
1808 	struct ifaddr *ifa;
1809 
1810 	ifa = __containerof(ctx, struct ifaddr, ifa_epoch_ctx);
1811 	counter_u64_free(ifa->ifa_opackets);
1812 	counter_u64_free(ifa->ifa_ipackets);
1813 	counter_u64_free(ifa->ifa_obytes);
1814 	counter_u64_free(ifa->ifa_ibytes);
1815 	free(ifa, M_IFADDR);
1816 }
1817 
1818 void
1819 ifa_free(struct ifaddr *ifa)
1820 {
1821 
1822 	if (refcount_release(&ifa->ifa_refcnt))
1823 		NET_EPOCH_CALL(ifa_destroy, &ifa->ifa_epoch_ctx);
1824 }
1825 
1826 /*
1827  * XXX: Because sockaddr_dl has deeper structure than the sockaddr
1828  * structs used to represent other address families, it is necessary
1829  * to perform a different comparison.
1830  */
1831 
1832 #define	sa_dl_equal(a1, a2)	\
1833 	((((const struct sockaddr_dl *)(a1))->sdl_len ==		\
1834 	 ((const struct sockaddr_dl *)(a2))->sdl_len) &&		\
1835 	 (bcmp(CLLADDR((const struct sockaddr_dl *)(a1)),		\
1836 	       CLLADDR((const struct sockaddr_dl *)(a2)),		\
1837 	       ((const struct sockaddr_dl *)(a1))->sdl_alen) == 0))
1838 
1839 /*
1840  * Locate an interface based on a complete address.
1841  */
1842 /*ARGSUSED*/
1843 struct ifaddr *
1844 ifa_ifwithaddr(const struct sockaddr *addr)
1845 {
1846 	struct ifnet *ifp;
1847 	struct ifaddr *ifa;
1848 
1849 	NET_EPOCH_ASSERT();
1850 
1851 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1852 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1853 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1854 				continue;
1855 			if (sa_equal(addr, ifa->ifa_addr)) {
1856 				goto done;
1857 			}
1858 			/* IP6 doesn't have broadcast */
1859 			if ((ifp->if_flags & IFF_BROADCAST) &&
1860 			    ifa->ifa_broadaddr &&
1861 			    ifa->ifa_broadaddr->sa_len != 0 &&
1862 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1863 				goto done;
1864 			}
1865 		}
1866 	}
1867 	ifa = NULL;
1868 done:
1869 	return (ifa);
1870 }
1871 
1872 int
1873 ifa_ifwithaddr_check(const struct sockaddr *addr)
1874 {
1875 	struct epoch_tracker et;
1876 	int rc;
1877 
1878 	NET_EPOCH_ENTER(et);
1879 	rc = (ifa_ifwithaddr(addr) != NULL);
1880 	NET_EPOCH_EXIT(et);
1881 	return (rc);
1882 }
1883 
1884 /*
1885  * Locate an interface based on the broadcast address.
1886  */
1887 /* ARGSUSED */
1888 struct ifaddr *
1889 ifa_ifwithbroadaddr(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 ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1897 			continue;
1898 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1899 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1900 				continue;
1901 			if ((ifp->if_flags & IFF_BROADCAST) &&
1902 			    ifa->ifa_broadaddr &&
1903 			    ifa->ifa_broadaddr->sa_len != 0 &&
1904 			    sa_equal(ifa->ifa_broadaddr, addr)) {
1905 				goto done;
1906 			}
1907 		}
1908 	}
1909 	ifa = NULL;
1910 done:
1911 	return (ifa);
1912 }
1913 
1914 /*
1915  * Locate the point to point interface with a given destination address.
1916  */
1917 /*ARGSUSED*/
1918 struct ifaddr *
1919 ifa_ifwithdstaddr(const struct sockaddr *addr, int fibnum)
1920 {
1921 	struct ifnet *ifp;
1922 	struct ifaddr *ifa;
1923 
1924 	NET_EPOCH_ASSERT();
1925 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1926 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1927 			continue;
1928 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1929 			continue;
1930 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1931 			if (ifa->ifa_addr->sa_family != addr->sa_family)
1932 				continue;
1933 			if (ifa->ifa_dstaddr != NULL &&
1934 			    sa_equal(addr, ifa->ifa_dstaddr)) {
1935 				goto done;
1936 			}
1937 		}
1938 	}
1939 	ifa = NULL;
1940 done:
1941 	return (ifa);
1942 }
1943 
1944 /*
1945  * Find an interface on a specific network.  If many, choice
1946  * is most specific found.
1947  */
1948 struct ifaddr *
1949 ifa_ifwithnet(const struct sockaddr *addr, int ignore_ptp, int fibnum)
1950 {
1951 	struct ifnet *ifp;
1952 	struct ifaddr *ifa;
1953 	struct ifaddr *ifa_maybe = NULL;
1954 	u_int af = addr->sa_family;
1955 	const char *addr_data = addr->sa_data, *cplim;
1956 
1957 	NET_EPOCH_ASSERT();
1958 	/*
1959 	 * AF_LINK addresses can be looked up directly by their index number,
1960 	 * so do that if we can.
1961 	 */
1962 	if (af == AF_LINK) {
1963 	    const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)addr;
1964 	    if (sdl->sdl_index && sdl->sdl_index <= V_if_index)
1965 		return (ifaddr_byindex(sdl->sdl_index));
1966 	}
1967 
1968 	/*
1969 	 * Scan though each interface, looking for ones that have addresses
1970 	 * in this address family and the requested fib.
1971 	 */
1972 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1973 		if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum))
1974 			continue;
1975 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1976 			const char *cp, *cp2, *cp3;
1977 
1978 			if (ifa->ifa_addr->sa_family != af)
1979 next:				continue;
1980 			if (af == AF_INET &&
1981 			    ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) {
1982 				/*
1983 				 * This is a bit broken as it doesn't
1984 				 * take into account that the remote end may
1985 				 * be a single node in the network we are
1986 				 * looking for.
1987 				 * The trouble is that we don't know the
1988 				 * netmask for the remote end.
1989 				 */
1990 				if (ifa->ifa_dstaddr != NULL &&
1991 				    sa_equal(addr, ifa->ifa_dstaddr)) {
1992 					goto done;
1993 				}
1994 			} else {
1995 				/*
1996 				 * Scan all the bits in the ifa's address.
1997 				 * If a bit dissagrees with what we are
1998 				 * looking for, mask it with the netmask
1999 				 * to see if it really matters.
2000 				 * (A byte at a time)
2001 				 */
2002 				if (ifa->ifa_netmask == 0)
2003 					continue;
2004 				cp = addr_data;
2005 				cp2 = ifa->ifa_addr->sa_data;
2006 				cp3 = ifa->ifa_netmask->sa_data;
2007 				cplim = ifa->ifa_netmask->sa_len
2008 					+ (char *)ifa->ifa_netmask;
2009 				while (cp3 < cplim)
2010 					if ((*cp++ ^ *cp2++) & *cp3++)
2011 						goto next; /* next address! */
2012 				/*
2013 				 * If the netmask of what we just found
2014 				 * is more specific than what we had before
2015 				 * (if we had one), or if the virtual status
2016 				 * of new prefix is better than of the old one,
2017 				 * then remember the new one before continuing
2018 				 * to search for an even better one.
2019 				 */
2020 				if (ifa_maybe == NULL ||
2021 				    ifa_preferred(ifa_maybe, ifa) ||
2022 				    rn_refines((caddr_t)ifa->ifa_netmask,
2023 				    (caddr_t)ifa_maybe->ifa_netmask)) {
2024 					ifa_maybe = ifa;
2025 				}
2026 			}
2027 		}
2028 	}
2029 	ifa = ifa_maybe;
2030 	ifa_maybe = NULL;
2031 done:
2032 	return (ifa);
2033 }
2034 
2035 /*
2036  * Find an interface address specific to an interface best matching
2037  * a given address.
2038  */
2039 struct ifaddr *
2040 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp)
2041 {
2042 	struct ifaddr *ifa;
2043 	const char *cp, *cp2, *cp3;
2044 	char *cplim;
2045 	struct ifaddr *ifa_maybe = NULL;
2046 	u_int af = addr->sa_family;
2047 
2048 	if (af >= AF_MAX)
2049 		return (NULL);
2050 
2051 	NET_EPOCH_ASSERT();
2052 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2053 		if (ifa->ifa_addr->sa_family != af)
2054 			continue;
2055 		if (ifa_maybe == NULL)
2056 			ifa_maybe = ifa;
2057 		if (ifa->ifa_netmask == 0) {
2058 			if (sa_equal(addr, ifa->ifa_addr) ||
2059 			    (ifa->ifa_dstaddr &&
2060 			    sa_equal(addr, ifa->ifa_dstaddr)))
2061 				goto done;
2062 			continue;
2063 		}
2064 		if (ifp->if_flags & IFF_POINTOPOINT) {
2065 			if (sa_equal(addr, ifa->ifa_dstaddr))
2066 				goto done;
2067 		} else {
2068 			cp = addr->sa_data;
2069 			cp2 = ifa->ifa_addr->sa_data;
2070 			cp3 = ifa->ifa_netmask->sa_data;
2071 			cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
2072 			for (; cp3 < cplim; cp3++)
2073 				if ((*cp++ ^ *cp2++) & *cp3)
2074 					break;
2075 			if (cp3 == cplim)
2076 				goto done;
2077 		}
2078 	}
2079 	ifa = ifa_maybe;
2080 done:
2081 	return (ifa);
2082 }
2083 
2084 /*
2085  * See whether new ifa is better than current one:
2086  * 1) A non-virtual one is preferred over virtual.
2087  * 2) A virtual in master state preferred over any other state.
2088  *
2089  * Used in several address selecting functions.
2090  */
2091 int
2092 ifa_preferred(struct ifaddr *cur, struct ifaddr *next)
2093 {
2094 
2095 	return (cur->ifa_carp && (!next->ifa_carp ||
2096 	    ((*carp_master_p)(next) && !(*carp_master_p)(cur))));
2097 }
2098 
2099 struct sockaddr_dl *
2100 link_alloc_sdl(size_t size, int flags)
2101 {
2102 
2103 	return (malloc(size, M_TEMP, flags));
2104 }
2105 
2106 void
2107 link_free_sdl(struct sockaddr *sa)
2108 {
2109 	free(sa, M_TEMP);
2110 }
2111 
2112 /*
2113  * Fills in given sdl with interface basic info.
2114  * Returns pointer to filled sdl.
2115  */
2116 struct sockaddr_dl *
2117 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype)
2118 {
2119 	struct sockaddr_dl *sdl;
2120 
2121 	sdl = (struct sockaddr_dl *)paddr;
2122 	memset(sdl, 0, sizeof(struct sockaddr_dl));
2123 	sdl->sdl_len = sizeof(struct sockaddr_dl);
2124 	sdl->sdl_family = AF_LINK;
2125 	sdl->sdl_index = ifp->if_index;
2126 	sdl->sdl_type = iftype;
2127 
2128 	return (sdl);
2129 }
2130 
2131 /*
2132  * Mark an interface down and notify protocols of
2133  * the transition.
2134  */
2135 static void
2136 if_unroute(struct ifnet *ifp, int flag, int fam)
2137 {
2138 	struct ifaddr *ifa;
2139 	struct epoch_tracker et;
2140 
2141 	KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP"));
2142 
2143 	ifp->if_flags &= ~flag;
2144 	getmicrotime(&ifp->if_lastchange);
2145 	NET_EPOCH_ENTER(et);
2146 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2147 		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2148 			pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
2149 	NET_EPOCH_EXIT(et);
2150 	ifp->if_qflush(ifp);
2151 
2152 	if (ifp->if_carp)
2153 		(*carp_linkstate_p)(ifp);
2154 	rt_ifmsg(ifp);
2155 }
2156 
2157 /*
2158  * Mark an interface up and notify protocols of
2159  * the transition.
2160  */
2161 static void
2162 if_route(struct ifnet *ifp, int flag, int fam)
2163 {
2164 	struct ifaddr *ifa;
2165 	struct epoch_tracker et;
2166 
2167 	KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP"));
2168 
2169 	ifp->if_flags |= flag;
2170 	getmicrotime(&ifp->if_lastchange);
2171 	NET_EPOCH_ENTER(et);
2172 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
2173 		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
2174 			pfctlinput(PRC_IFUP, ifa->ifa_addr);
2175 	NET_EPOCH_EXIT(et);
2176 	if (ifp->if_carp)
2177 		(*carp_linkstate_p)(ifp);
2178 	rt_ifmsg(ifp);
2179 #ifdef INET6
2180 	in6_if_up(ifp);
2181 #endif
2182 }
2183 
2184 void	(*vlan_link_state_p)(struct ifnet *);	/* XXX: private from if_vlan */
2185 void	(*vlan_trunk_cap_p)(struct ifnet *);		/* XXX: private from if_vlan */
2186 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *);
2187 struct	ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t);
2188 int	(*vlan_tag_p)(struct ifnet *, uint16_t *);
2189 int	(*vlan_pcp_p)(struct ifnet *, uint16_t *);
2190 int	(*vlan_setcookie_p)(struct ifnet *, void *);
2191 void	*(*vlan_cookie_p)(struct ifnet *);
2192 
2193 /*
2194  * Handle a change in the interface link state. To avoid LORs
2195  * between driver lock and upper layer locks, as well as possible
2196  * recursions, we post event to taskqueue, and all job
2197  * is done in static do_link_state_change().
2198  */
2199 void
2200 if_link_state_change(struct ifnet *ifp, int link_state)
2201 {
2202 	/* Return if state hasn't changed. */
2203 	if (ifp->if_link_state == link_state)
2204 		return;
2205 
2206 	ifp->if_link_state = link_state;
2207 
2208 	/* XXXGL: reference ifp? */
2209 	taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
2210 }
2211 
2212 static void
2213 do_link_state_change(void *arg, int pending)
2214 {
2215 	struct ifnet *ifp;
2216 	int link_state;
2217 
2218 	ifp = arg;
2219 	link_state = ifp->if_link_state;
2220 
2221 	CURVNET_SET(ifp->if_vnet);
2222 	rt_ifmsg(ifp);
2223 	if (ifp->if_vlantrunk != NULL)
2224 		(*vlan_link_state_p)(ifp);
2225 
2226 	if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) &&
2227 	    ifp->if_l2com != NULL)
2228 		(*ng_ether_link_state_p)(ifp, link_state);
2229 	if (ifp->if_carp)
2230 		(*carp_linkstate_p)(ifp);
2231 	if (ifp->if_bridge)
2232 		ifp->if_bridge_linkstate(ifp);
2233 	if (ifp->if_lagg)
2234 		(*lagg_linkstate_p)(ifp, link_state);
2235 
2236 	if (IS_DEFAULT_VNET(curvnet))
2237 		devctl_notify("IFNET", ifp->if_xname,
2238 		    (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN",
2239 		    NULL);
2240 	if (pending > 1)
2241 		if_printf(ifp, "%d link states coalesced\n", pending);
2242 	if (log_link_state_change)
2243 		if_printf(ifp, "link state changed to %s\n",
2244 		    (link_state == LINK_STATE_UP) ? "UP" : "DOWN" );
2245 	EVENTHANDLER_INVOKE(ifnet_link_event, ifp, link_state);
2246 	CURVNET_RESTORE();
2247 }
2248 
2249 /*
2250  * Mark an interface down and notify protocols of
2251  * the transition.
2252  */
2253 void
2254 if_down(struct ifnet *ifp)
2255 {
2256 
2257 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
2258 	if_unroute(ifp, IFF_UP, AF_UNSPEC);
2259 }
2260 
2261 /*
2262  * Mark an interface up and notify protocols of
2263  * the transition.
2264  */
2265 void
2266 if_up(struct ifnet *ifp)
2267 {
2268 
2269 	if_route(ifp, IFF_UP, AF_UNSPEC);
2270 	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
2271 }
2272 
2273 /*
2274  * Flush an interface queue.
2275  */
2276 void
2277 if_qflush(struct ifnet *ifp)
2278 {
2279 	struct mbuf *m, *n;
2280 	struct ifaltq *ifq;
2281 
2282 	ifq = &ifp->if_snd;
2283 	IFQ_LOCK(ifq);
2284 #ifdef ALTQ
2285 	if (ALTQ_IS_ENABLED(ifq))
2286 		ALTQ_PURGE(ifq);
2287 #endif
2288 	n = ifq->ifq_head;
2289 	while ((m = n) != NULL) {
2290 		n = m->m_nextpkt;
2291 		m_freem(m);
2292 	}
2293 	ifq->ifq_head = 0;
2294 	ifq->ifq_tail = 0;
2295 	ifq->ifq_len = 0;
2296 	IFQ_UNLOCK(ifq);
2297 }
2298 
2299 /*
2300  * Map interface name to interface structure pointer, with or without
2301  * returning a reference.
2302  */
2303 struct ifnet *
2304 ifunit_ref(const char *name)
2305 {
2306 	struct epoch_tracker et;
2307 	struct ifnet *ifp;
2308 
2309 	NET_EPOCH_ENTER(et);
2310 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2311 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 &&
2312 		    !(ifp->if_flags & IFF_DYING))
2313 			break;
2314 	}
2315 	if (ifp != NULL)
2316 		if_ref(ifp);
2317 	NET_EPOCH_EXIT(et);
2318 	return (ifp);
2319 }
2320 
2321 struct ifnet *
2322 ifunit(const char *name)
2323 {
2324 	struct epoch_tracker et;
2325 	struct ifnet *ifp;
2326 
2327 	NET_EPOCH_ENTER(et);
2328 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2329 		if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0)
2330 			break;
2331 	}
2332 	NET_EPOCH_EXIT(et);
2333 	return (ifp);
2334 }
2335 
2336 void *
2337 ifr_buffer_get_buffer(void *data)
2338 {
2339 	union ifreq_union *ifrup;
2340 
2341 	ifrup = data;
2342 #ifdef COMPAT_FREEBSD32
2343 	if (SV_CURPROC_FLAG(SV_ILP32))
2344 		return ((void *)(uintptr_t)
2345 		    ifrup->ifr32.ifr_ifru.ifru_buffer.buffer);
2346 #endif
2347 	return (ifrup->ifr.ifr_ifru.ifru_buffer.buffer);
2348 }
2349 
2350 static void
2351 ifr_buffer_set_buffer_null(void *data)
2352 {
2353 	union ifreq_union *ifrup;
2354 
2355 	ifrup = data;
2356 #ifdef COMPAT_FREEBSD32
2357 	if (SV_CURPROC_FLAG(SV_ILP32))
2358 		ifrup->ifr32.ifr_ifru.ifru_buffer.buffer = 0;
2359 	else
2360 #endif
2361 		ifrup->ifr.ifr_ifru.ifru_buffer.buffer = NULL;
2362 }
2363 
2364 size_t
2365 ifr_buffer_get_length(void *data)
2366 {
2367 	union ifreq_union *ifrup;
2368 
2369 	ifrup = data;
2370 #ifdef COMPAT_FREEBSD32
2371 	if (SV_CURPROC_FLAG(SV_ILP32))
2372 		return (ifrup->ifr32.ifr_ifru.ifru_buffer.length);
2373 #endif
2374 	return (ifrup->ifr.ifr_ifru.ifru_buffer.length);
2375 }
2376 
2377 static void
2378 ifr_buffer_set_length(void *data, size_t len)
2379 {
2380 	union ifreq_union *ifrup;
2381 
2382 	ifrup = data;
2383 #ifdef COMPAT_FREEBSD32
2384 	if (SV_CURPROC_FLAG(SV_ILP32))
2385 		ifrup->ifr32.ifr_ifru.ifru_buffer.length = len;
2386 	else
2387 #endif
2388 		ifrup->ifr.ifr_ifru.ifru_buffer.length = len;
2389 }
2390 
2391 void *
2392 ifr_data_get_ptr(void *ifrp)
2393 {
2394 	union ifreq_union *ifrup;
2395 
2396 	ifrup = ifrp;
2397 #ifdef COMPAT_FREEBSD32
2398 	if (SV_CURPROC_FLAG(SV_ILP32))
2399 		return ((void *)(uintptr_t)
2400 		    ifrup->ifr32.ifr_ifru.ifru_data);
2401 #endif
2402 		return (ifrup->ifr.ifr_ifru.ifru_data);
2403 }
2404 
2405 /*
2406  * Hardware specific interface ioctls.
2407  */
2408 int
2409 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
2410 {
2411 	struct ifreq *ifr;
2412 	int error = 0, do_ifup = 0;
2413 	int new_flags, temp_flags;
2414 	size_t namelen, onamelen;
2415 	size_t descrlen;
2416 	char *descrbuf, *odescrbuf;
2417 	char new_name[IFNAMSIZ];
2418 	char old_name[IFNAMSIZ], strbuf[IFNAMSIZ + 8];
2419 	struct ifaddr *ifa;
2420 	struct sockaddr_dl *sdl;
2421 
2422 	ifr = (struct ifreq *)data;
2423 	switch (cmd) {
2424 	case SIOCGIFINDEX:
2425 		ifr->ifr_index = ifp->if_index;
2426 		break;
2427 
2428 	case SIOCGIFFLAGS:
2429 		temp_flags = ifp->if_flags | ifp->if_drv_flags;
2430 		ifr->ifr_flags = temp_flags & 0xffff;
2431 		ifr->ifr_flagshigh = temp_flags >> 16;
2432 		break;
2433 
2434 	case SIOCGIFCAP:
2435 		ifr->ifr_reqcap = ifp->if_capabilities;
2436 		ifr->ifr_curcap = ifp->if_capenable;
2437 		break;
2438 
2439 	case SIOCGIFDATA:
2440 	{
2441 		struct if_data ifd;
2442 
2443 		/* Ensure uninitialised padding is not leaked. */
2444 		memset(&ifd, 0, sizeof(ifd));
2445 
2446 		if_data_copy(ifp, &ifd);
2447 		error = copyout(&ifd, ifr_data_get_ptr(ifr), sizeof(ifd));
2448 		break;
2449 	}
2450 
2451 #ifdef MAC
2452 	case SIOCGIFMAC:
2453 		error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp);
2454 		break;
2455 #endif
2456 
2457 	case SIOCGIFMETRIC:
2458 		ifr->ifr_metric = ifp->if_metric;
2459 		break;
2460 
2461 	case SIOCGIFMTU:
2462 		ifr->ifr_mtu = ifp->if_mtu;
2463 		break;
2464 
2465 	case SIOCGIFPHYS:
2466 		/* XXXGL: did this ever worked? */
2467 		ifr->ifr_phys = 0;
2468 		break;
2469 
2470 	case SIOCGIFDESCR:
2471 		error = 0;
2472 		sx_slock(&ifdescr_sx);
2473 		if (ifp->if_description == NULL)
2474 			error = ENOMSG;
2475 		else {
2476 			/* space for terminating nul */
2477 			descrlen = strlen(ifp->if_description) + 1;
2478 			if (ifr_buffer_get_length(ifr) < descrlen)
2479 				ifr_buffer_set_buffer_null(ifr);
2480 			else
2481 				error = copyout(ifp->if_description,
2482 				    ifr_buffer_get_buffer(ifr), descrlen);
2483 			ifr_buffer_set_length(ifr, descrlen);
2484 		}
2485 		sx_sunlock(&ifdescr_sx);
2486 		break;
2487 
2488 	case SIOCSIFDESCR:
2489 		error = priv_check(td, PRIV_NET_SETIFDESCR);
2490 		if (error)
2491 			return (error);
2492 
2493 		/*
2494 		 * Copy only (length-1) bytes to make sure that
2495 		 * if_description is always nul terminated.  The
2496 		 * length parameter is supposed to count the
2497 		 * terminating nul in.
2498 		 */
2499 		if (ifr_buffer_get_length(ifr) > ifdescr_maxlen)
2500 			return (ENAMETOOLONG);
2501 		else if (ifr_buffer_get_length(ifr) == 0)
2502 			descrbuf = NULL;
2503 		else {
2504 			descrbuf = malloc(ifr_buffer_get_length(ifr),
2505 			    M_IFDESCR, M_WAITOK | M_ZERO);
2506 			error = copyin(ifr_buffer_get_buffer(ifr), descrbuf,
2507 			    ifr_buffer_get_length(ifr) - 1);
2508 			if (error) {
2509 				free(descrbuf, M_IFDESCR);
2510 				break;
2511 			}
2512 		}
2513 
2514 		sx_xlock(&ifdescr_sx);
2515 		odescrbuf = ifp->if_description;
2516 		ifp->if_description = descrbuf;
2517 		sx_xunlock(&ifdescr_sx);
2518 
2519 		getmicrotime(&ifp->if_lastchange);
2520 		free(odescrbuf, M_IFDESCR);
2521 		break;
2522 
2523 	case SIOCGIFFIB:
2524 		ifr->ifr_fib = ifp->if_fib;
2525 		break;
2526 
2527 	case SIOCSIFFIB:
2528 		error = priv_check(td, PRIV_NET_SETIFFIB);
2529 		if (error)
2530 			return (error);
2531 		if (ifr->ifr_fib >= rt_numfibs)
2532 			return (EINVAL);
2533 
2534 		ifp->if_fib = ifr->ifr_fib;
2535 		break;
2536 
2537 	case SIOCSIFFLAGS:
2538 		error = priv_check(td, PRIV_NET_SETIFFLAGS);
2539 		if (error)
2540 			return (error);
2541 		/*
2542 		 * Currently, no driver owned flags pass the IFF_CANTCHANGE
2543 		 * check, so we don't need special handling here yet.
2544 		 */
2545 		new_flags = (ifr->ifr_flags & 0xffff) |
2546 		    (ifr->ifr_flagshigh << 16);
2547 		if (ifp->if_flags & IFF_UP &&
2548 		    (new_flags & IFF_UP) == 0) {
2549 			if_down(ifp);
2550 		} else if (new_flags & IFF_UP &&
2551 		    (ifp->if_flags & IFF_UP) == 0) {
2552 			do_ifup = 1;
2553 		}
2554 		/* See if permanently promiscuous mode bit is about to flip */
2555 		if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) {
2556 			if (new_flags & IFF_PPROMISC)
2557 				ifp->if_flags |= IFF_PROMISC;
2558 			else if (ifp->if_pcount == 0)
2559 				ifp->if_flags &= ~IFF_PROMISC;
2560 			if (log_promisc_mode_change)
2561                                 if_printf(ifp, "permanently promiscuous mode %s\n",
2562                                     ((new_flags & IFF_PPROMISC) ?
2563                                      "enabled" : "disabled"));
2564 		}
2565 		ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
2566 			(new_flags &~ IFF_CANTCHANGE);
2567 		if (ifp->if_ioctl) {
2568 			(void) (*ifp->if_ioctl)(ifp, cmd, data);
2569 		}
2570 		if (do_ifup)
2571 			if_up(ifp);
2572 		getmicrotime(&ifp->if_lastchange);
2573 		break;
2574 
2575 	case SIOCSIFCAP:
2576 		error = priv_check(td, PRIV_NET_SETIFCAP);
2577 		if (error)
2578 			return (error);
2579 		if (ifp->if_ioctl == NULL)
2580 			return (EOPNOTSUPP);
2581 		if (ifr->ifr_reqcap & ~ifp->if_capabilities)
2582 			return (EINVAL);
2583 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2584 		if (error == 0)
2585 			getmicrotime(&ifp->if_lastchange);
2586 		break;
2587 
2588 #ifdef MAC
2589 	case SIOCSIFMAC:
2590 		error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp);
2591 		break;
2592 #endif
2593 
2594 	case SIOCSIFNAME:
2595 		error = priv_check(td, PRIV_NET_SETIFNAME);
2596 		if (error)
2597 			return (error);
2598 		error = copyinstr(ifr_data_get_ptr(ifr), new_name, IFNAMSIZ,
2599 		    NULL);
2600 		if (error != 0)
2601 			return (error);
2602 		if (new_name[0] == '\0')
2603 			return (EINVAL);
2604 		if (strcmp(new_name, ifp->if_xname) == 0)
2605 			break;
2606 		if (ifunit(new_name) != NULL)
2607 			return (EEXIST);
2608 
2609 		/*
2610 		 * XXX: Locking.  Nothing else seems to lock if_flags,
2611 		 * and there are numerous other races with the
2612 		 * ifunit() checks not being atomic with namespace
2613 		 * changes (renames, vmoves, if_attach, etc).
2614 		 */
2615 		ifp->if_flags |= IFF_RENAMING;
2616 
2617 		/* Announce the departure of the interface. */
2618 		rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
2619 		EVENTHANDLER_INVOKE(ifnet_departure_event, ifp);
2620 
2621 		if_printf(ifp, "changing name to '%s'\n", new_name);
2622 
2623 		IF_ADDR_WLOCK(ifp);
2624 		strlcpy(old_name, ifp->if_xname, sizeof(old_name));
2625 		strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
2626 		ifa = ifp->if_addr;
2627 		sdl = (struct sockaddr_dl *)ifa->ifa_addr;
2628 		namelen = strlen(new_name);
2629 		onamelen = sdl->sdl_nlen;
2630 		/*
2631 		 * Move the address if needed.  This is safe because we
2632 		 * allocate space for a name of length IFNAMSIZ when we
2633 		 * create this in if_attach().
2634 		 */
2635 		if (namelen != onamelen) {
2636 			bcopy(sdl->sdl_data + onamelen,
2637 			    sdl->sdl_data + namelen, sdl->sdl_alen);
2638 		}
2639 		bcopy(new_name, sdl->sdl_data, namelen);
2640 		sdl->sdl_nlen = namelen;
2641 		sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
2642 		bzero(sdl->sdl_data, onamelen);
2643 		while (namelen != 0)
2644 			sdl->sdl_data[--namelen] = 0xff;
2645 		IF_ADDR_WUNLOCK(ifp);
2646 
2647 		EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp);
2648 		/* Announce the return of the interface. */
2649 		rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
2650 
2651 		ifp->if_flags &= ~IFF_RENAMING;
2652 
2653 		snprintf(strbuf, sizeof(strbuf), "name=%s", new_name);
2654 		devctl_notify("IFNET", old_name, "RENAME", strbuf);
2655 		break;
2656 
2657 #ifdef VIMAGE
2658 	case SIOCSIFVNET:
2659 		error = priv_check(td, PRIV_NET_SETIFVNET);
2660 		if (error)
2661 			return (error);
2662 		error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid);
2663 		break;
2664 #endif
2665 
2666 	case SIOCSIFMETRIC:
2667 		error = priv_check(td, PRIV_NET_SETIFMETRIC);
2668 		if (error)
2669 			return (error);
2670 		ifp->if_metric = ifr->ifr_metric;
2671 		getmicrotime(&ifp->if_lastchange);
2672 		break;
2673 
2674 	case SIOCSIFPHYS:
2675 		error = priv_check(td, PRIV_NET_SETIFPHYS);
2676 		if (error)
2677 			return (error);
2678 		if (ifp->if_ioctl == NULL)
2679 			return (EOPNOTSUPP);
2680 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2681 		if (error == 0)
2682 			getmicrotime(&ifp->if_lastchange);
2683 		break;
2684 
2685 	case SIOCSIFMTU:
2686 	{
2687 		u_long oldmtu = ifp->if_mtu;
2688 
2689 		error = priv_check(td, PRIV_NET_SETIFMTU);
2690 		if (error)
2691 			return (error);
2692 		if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
2693 			return (EINVAL);
2694 		if (ifp->if_ioctl == NULL)
2695 			return (EOPNOTSUPP);
2696 		/* Disallow MTU changes on bridge member interfaces. */
2697 		if (ifp->if_bridge)
2698 			return (EOPNOTSUPP);
2699 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2700 		if (error == 0) {
2701 			getmicrotime(&ifp->if_lastchange);
2702 			rt_ifmsg(ifp);
2703 #ifdef INET
2704 			DEBUGNET_NOTIFY_MTU(ifp);
2705 #endif
2706 		}
2707 		/*
2708 		 * If the link MTU changed, do network layer specific procedure.
2709 		 */
2710 		if (ifp->if_mtu != oldmtu) {
2711 #ifdef INET6
2712 			nd6_setmtu(ifp);
2713 #endif
2714 			rt_updatemtu(ifp);
2715 		}
2716 		break;
2717 	}
2718 
2719 	case SIOCADDMULTI:
2720 	case SIOCDELMULTI:
2721 		if (cmd == SIOCADDMULTI)
2722 			error = priv_check(td, PRIV_NET_ADDMULTI);
2723 		else
2724 			error = priv_check(td, PRIV_NET_DELMULTI);
2725 		if (error)
2726 			return (error);
2727 
2728 		/* Don't allow group membership on non-multicast interfaces. */
2729 		if ((ifp->if_flags & IFF_MULTICAST) == 0)
2730 			return (EOPNOTSUPP);
2731 
2732 		/* Don't let users screw up protocols' entries. */
2733 		if (ifr->ifr_addr.sa_family != AF_LINK)
2734 			return (EINVAL);
2735 
2736 		if (cmd == SIOCADDMULTI) {
2737 			struct epoch_tracker et;
2738 			struct ifmultiaddr *ifma;
2739 
2740 			/*
2741 			 * Userland is only permitted to join groups once
2742 			 * via the if_addmulti() KPI, because it cannot hold
2743 			 * struct ifmultiaddr * between calls. It may also
2744 			 * lose a race while we check if the membership
2745 			 * already exists.
2746 			 */
2747 			NET_EPOCH_ENTER(et);
2748 			ifma = if_findmulti(ifp, &ifr->ifr_addr);
2749 			NET_EPOCH_EXIT(et);
2750 			if (ifma != NULL)
2751 				error = EADDRINUSE;
2752 			else
2753 				error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
2754 		} else {
2755 			error = if_delmulti(ifp, &ifr->ifr_addr);
2756 		}
2757 		if (error == 0)
2758 			getmicrotime(&ifp->if_lastchange);
2759 		break;
2760 
2761 	case SIOCSIFPHYADDR:
2762 	case SIOCDIFPHYADDR:
2763 #ifdef INET6
2764 	case SIOCSIFPHYADDR_IN6:
2765 #endif
2766 	case SIOCSIFMEDIA:
2767 	case SIOCSIFGENERIC:
2768 		error = priv_check(td, PRIV_NET_HWIOCTL);
2769 		if (error)
2770 			return (error);
2771 		if (ifp->if_ioctl == NULL)
2772 			return (EOPNOTSUPP);
2773 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2774 		if (error == 0)
2775 			getmicrotime(&ifp->if_lastchange);
2776 		break;
2777 
2778 	case SIOCGIFSTATUS:
2779 	case SIOCGIFPSRCADDR:
2780 	case SIOCGIFPDSTADDR:
2781 	case SIOCGIFMEDIA:
2782 	case SIOCGIFXMEDIA:
2783 	case SIOCGIFGENERIC:
2784 	case SIOCGIFRSSKEY:
2785 	case SIOCGIFRSSHASH:
2786 	case SIOCGIFDOWNREASON:
2787 		if (ifp->if_ioctl == NULL)
2788 			return (EOPNOTSUPP);
2789 		error = (*ifp->if_ioctl)(ifp, cmd, data);
2790 		break;
2791 
2792 	case SIOCSIFLLADDR:
2793 		error = priv_check(td, PRIV_NET_SETLLADDR);
2794 		if (error)
2795 			return (error);
2796 		error = if_setlladdr(ifp,
2797 		    ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
2798 		break;
2799 
2800 	case SIOCGHWADDR:
2801 		error = if_gethwaddr(ifp, ifr);
2802 		break;
2803 
2804 	case SIOCAIFGROUP:
2805 		error = priv_check(td, PRIV_NET_ADDIFGROUP);
2806 		if (error)
2807 			return (error);
2808 		error = if_addgroup(ifp,
2809 		    ((struct ifgroupreq *)data)->ifgr_group);
2810 		if (error != 0)
2811 			return (error);
2812 		break;
2813 
2814 	case SIOCGIFGROUP:
2815 	{
2816 		struct epoch_tracker et;
2817 
2818 		NET_EPOCH_ENTER(et);
2819 		error = if_getgroup((struct ifgroupreq *)data, ifp);
2820 		NET_EPOCH_EXIT(et);
2821 		break;
2822 	}
2823 
2824 	case SIOCDIFGROUP:
2825 		error = priv_check(td, PRIV_NET_DELIFGROUP);
2826 		if (error)
2827 			return (error);
2828 		error = if_delgroup(ifp,
2829 		    ((struct ifgroupreq *)data)->ifgr_group);
2830 		if (error != 0)
2831 			return (error);
2832 		break;
2833 
2834 	default:
2835 		error = ENOIOCTL;
2836 		break;
2837 	}
2838 	return (error);
2839 }
2840 
2841 /*
2842  * Interface ioctls.
2843  */
2844 int
2845 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td)
2846 {
2847 #ifdef COMPAT_FREEBSD32
2848 	union {
2849 		struct ifconf ifc;
2850 		struct ifdrv ifd;
2851 		struct ifgroupreq ifgr;
2852 		struct ifmediareq ifmr;
2853 	} thunk;
2854 	u_long saved_cmd;
2855 	struct ifconf32 *ifc32;
2856 	struct ifdrv32 *ifd32;
2857 	struct ifgroupreq32 *ifgr32;
2858 	struct ifmediareq32 *ifmr32;
2859 #endif
2860 	struct ifnet *ifp;
2861 	struct ifreq *ifr;
2862 	int error;
2863 	int oif_flags;
2864 #ifdef VIMAGE
2865 	bool shutdown;
2866 #endif
2867 
2868 	CURVNET_SET(so->so_vnet);
2869 #ifdef VIMAGE
2870 	/* Make sure the VNET is stable. */
2871 	shutdown = VNET_IS_SHUTTING_DOWN(so->so_vnet);
2872 	if (shutdown) {
2873 		CURVNET_RESTORE();
2874 		return (EBUSY);
2875 	}
2876 #endif
2877 
2878 #ifdef COMPAT_FREEBSD32
2879 	saved_cmd = cmd;
2880 	switch (cmd) {
2881 	case SIOCGIFCONF32:
2882 		ifc32 = (struct ifconf32 *)data;
2883 		thunk.ifc.ifc_len = ifc32->ifc_len;
2884 		thunk.ifc.ifc_buf = PTRIN(ifc32->ifc_buf);
2885 		data = (caddr_t)&thunk.ifc;
2886 		cmd = SIOCGIFCONF;
2887 		break;
2888 	case SIOCGDRVSPEC32:
2889 	case SIOCSDRVSPEC32:
2890 		ifd32 = (struct ifdrv32 *)data;
2891 		memcpy(thunk.ifd.ifd_name, ifd32->ifd_name,
2892 		    sizeof(thunk.ifd.ifd_name));
2893 		thunk.ifd.ifd_cmd = ifd32->ifd_cmd;
2894 		thunk.ifd.ifd_len = ifd32->ifd_len;
2895 		thunk.ifd.ifd_data = PTRIN(ifd32->ifd_data);
2896 		data = (caddr_t)&thunk.ifd;
2897 		cmd = _IOC_NEWTYPE(cmd, struct ifdrv);
2898 		break;
2899 	case SIOCAIFGROUP32:
2900 	case SIOCGIFGROUP32:
2901 	case SIOCDIFGROUP32:
2902 	case SIOCGIFGMEMB32:
2903 		ifgr32 = (struct ifgroupreq32 *)data;
2904 		memcpy(thunk.ifgr.ifgr_name, ifgr32->ifgr_name,
2905 		    sizeof(thunk.ifgr.ifgr_name));
2906 		thunk.ifgr.ifgr_len = ifgr32->ifgr_len;
2907 		switch (cmd) {
2908 		case SIOCAIFGROUP32:
2909 		case SIOCDIFGROUP32:
2910 			memcpy(thunk.ifgr.ifgr_group, ifgr32->ifgr_group,
2911 			    sizeof(thunk.ifgr.ifgr_group));
2912 			break;
2913 		case SIOCGIFGROUP32:
2914 		case SIOCGIFGMEMB32:
2915 			thunk.ifgr.ifgr_groups = PTRIN(ifgr32->ifgr_groups);
2916 			break;
2917 		}
2918 		data = (caddr_t)&thunk.ifgr;
2919 		cmd = _IOC_NEWTYPE(cmd, struct ifgroupreq);
2920 		break;
2921 	case SIOCGIFMEDIA32:
2922 	case SIOCGIFXMEDIA32:
2923 		ifmr32 = (struct ifmediareq32 *)data;
2924 		memcpy(thunk.ifmr.ifm_name, ifmr32->ifm_name,
2925 		    sizeof(thunk.ifmr.ifm_name));
2926 		thunk.ifmr.ifm_current = ifmr32->ifm_current;
2927 		thunk.ifmr.ifm_mask = ifmr32->ifm_mask;
2928 		thunk.ifmr.ifm_status = ifmr32->ifm_status;
2929 		thunk.ifmr.ifm_active = ifmr32->ifm_active;
2930 		thunk.ifmr.ifm_count = ifmr32->ifm_count;
2931 		thunk.ifmr.ifm_ulist = PTRIN(ifmr32->ifm_ulist);
2932 		data = (caddr_t)&thunk.ifmr;
2933 		cmd = _IOC_NEWTYPE(cmd, struct ifmediareq);
2934 		break;
2935 	}
2936 #endif
2937 
2938 	switch (cmd) {
2939 	case SIOCGIFCONF:
2940 		error = ifconf(cmd, data);
2941 		goto out_noref;
2942 	}
2943 
2944 	ifr = (struct ifreq *)data;
2945 	switch (cmd) {
2946 #ifdef VIMAGE
2947 	case SIOCSIFRVNET:
2948 		error = priv_check(td, PRIV_NET_SETIFVNET);
2949 		if (error == 0)
2950 			error = if_vmove_reclaim(td, ifr->ifr_name,
2951 			    ifr->ifr_jid);
2952 		goto out_noref;
2953 #endif
2954 	case SIOCIFCREATE:
2955 	case SIOCIFCREATE2:
2956 		error = priv_check(td, PRIV_NET_IFCREATE);
2957 		if (error == 0)
2958 			error = if_clone_create(ifr->ifr_name,
2959 			    sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ?
2960 			    ifr_data_get_ptr(ifr) : NULL);
2961 		goto out_noref;
2962 	case SIOCIFDESTROY:
2963 		error = priv_check(td, PRIV_NET_IFDESTROY);
2964 
2965 		if (error == 0) {
2966 			sx_xlock(&ifnet_detach_sxlock);
2967 			error = if_clone_destroy(ifr->ifr_name);
2968 			sx_xunlock(&ifnet_detach_sxlock);
2969 		}
2970 		goto out_noref;
2971 
2972 	case SIOCIFGCLONERS:
2973 		error = if_clone_list((struct if_clonereq *)data);
2974 		goto out_noref;
2975 
2976 	case SIOCGIFGMEMB:
2977 		error = if_getgroupmembers((struct ifgroupreq *)data);
2978 		goto out_noref;
2979 
2980 #if defined(INET) || defined(INET6)
2981 	case SIOCSVH:
2982 	case SIOCGVH:
2983 		if (carp_ioctl_p == NULL)
2984 			error = EPROTONOSUPPORT;
2985 		else
2986 			error = (*carp_ioctl_p)(ifr, cmd, td);
2987 		goto out_noref;
2988 #endif
2989 	}
2990 
2991 	ifp = ifunit_ref(ifr->ifr_name);
2992 	if (ifp == NULL) {
2993 		error = ENXIO;
2994 		goto out_noref;
2995 	}
2996 
2997 	error = ifhwioctl(cmd, ifp, data, td);
2998 	if (error != ENOIOCTL)
2999 		goto out_ref;
3000 
3001 	oif_flags = ifp->if_flags;
3002 	if (so->so_proto == NULL) {
3003 		error = EOPNOTSUPP;
3004 		goto out_ref;
3005 	}
3006 
3007 	/*
3008 	 * Pass the request on to the socket control method, and if the
3009 	 * latter returns EOPNOTSUPP, directly to the interface.
3010 	 *
3011 	 * Make an exception for the legacy SIOCSIF* requests.  Drivers
3012 	 * trust SIOCSIFADDR et al to come from an already privileged
3013 	 * layer, and do not perform any credentials checks or input
3014 	 * validation.
3015 	 */
3016 	error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data,
3017 	    ifp, td));
3018 	if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL &&
3019 	    cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR &&
3020 	    cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK)
3021 		error = (*ifp->if_ioctl)(ifp, cmd, data);
3022 
3023 	if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
3024 #ifdef INET6
3025 		if (ifp->if_flags & IFF_UP)
3026 			in6_if_up(ifp);
3027 #endif
3028 	}
3029 
3030 out_ref:
3031 	if_rele(ifp);
3032 out_noref:
3033 	CURVNET_RESTORE();
3034 #ifdef COMPAT_FREEBSD32
3035 	if (error != 0)
3036 		return (error);
3037 	switch (saved_cmd) {
3038 	case SIOCGIFCONF32:
3039 		ifc32->ifc_len = thunk.ifc.ifc_len;
3040 		break;
3041 	case SIOCGDRVSPEC32:
3042 		/*
3043 		 * SIOCGDRVSPEC is IOWR, but nothing actually touches
3044 		 * the struct so just assert that ifd_len (the only
3045 		 * field it might make sense to update) hasn't
3046 		 * changed.
3047 		 */
3048 		KASSERT(thunk.ifd.ifd_len == ifd32->ifd_len,
3049 		    ("ifd_len was updated %u -> %zu", ifd32->ifd_len,
3050 			thunk.ifd.ifd_len));
3051 		break;
3052 	case SIOCGIFGROUP32:
3053 	case SIOCGIFGMEMB32:
3054 		ifgr32->ifgr_len = thunk.ifgr.ifgr_len;
3055 		break;
3056 	case SIOCGIFMEDIA32:
3057 	case SIOCGIFXMEDIA32:
3058 		ifmr32->ifm_current = thunk.ifmr.ifm_current;
3059 		ifmr32->ifm_mask = thunk.ifmr.ifm_mask;
3060 		ifmr32->ifm_status = thunk.ifmr.ifm_status;
3061 		ifmr32->ifm_active = thunk.ifmr.ifm_active;
3062 		ifmr32->ifm_count = thunk.ifmr.ifm_count;
3063 		break;
3064 	}
3065 #endif
3066 	return (error);
3067 }
3068 
3069 /*
3070  * The code common to handling reference counted flags,
3071  * e.g., in ifpromisc() and if_allmulti().
3072  * The "pflag" argument can specify a permanent mode flag to check,
3073  * such as IFF_PPROMISC for promiscuous mode; should be 0 if none.
3074  *
3075  * Only to be used on stack-owned flags, not driver-owned flags.
3076  */
3077 static int
3078 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch)
3079 {
3080 	struct ifreq ifr;
3081 	int error;
3082 	int oldflags, oldcount;
3083 
3084 	/* Sanity checks to catch programming errors */
3085 	KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0,
3086 	    ("%s: setting driver-owned flag %d", __func__, flag));
3087 
3088 	if (onswitch)
3089 		KASSERT(*refcount >= 0,
3090 		    ("%s: increment negative refcount %d for flag %d",
3091 		    __func__, *refcount, flag));
3092 	else
3093 		KASSERT(*refcount > 0,
3094 		    ("%s: decrement non-positive refcount %d for flag %d",
3095 		    __func__, *refcount, flag));
3096 
3097 	/* In case this mode is permanent, just touch refcount */
3098 	if (ifp->if_flags & pflag) {
3099 		*refcount += onswitch ? 1 : -1;
3100 		return (0);
3101 	}
3102 
3103 	/* Save ifnet parameters for if_ioctl() may fail */
3104 	oldcount = *refcount;
3105 	oldflags = ifp->if_flags;
3106 
3107 	/*
3108 	 * See if we aren't the only and touching refcount is enough.
3109 	 * Actually toggle interface flag if we are the first or last.
3110 	 */
3111 	if (onswitch) {
3112 		if ((*refcount)++)
3113 			return (0);
3114 		ifp->if_flags |= flag;
3115 	} else {
3116 		if (--(*refcount))
3117 			return (0);
3118 		ifp->if_flags &= ~flag;
3119 	}
3120 
3121 	/* Call down the driver since we've changed interface flags */
3122 	if (ifp->if_ioctl == NULL) {
3123 		error = EOPNOTSUPP;
3124 		goto recover;
3125 	}
3126 	ifr.ifr_flags = ifp->if_flags & 0xffff;
3127 	ifr.ifr_flagshigh = ifp->if_flags >> 16;
3128 	error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3129 	if (error)
3130 		goto recover;
3131 	/* Notify userland that interface flags have changed */
3132 	rt_ifmsg(ifp);
3133 	return (0);
3134 
3135 recover:
3136 	/* Recover after driver error */
3137 	*refcount = oldcount;
3138 	ifp->if_flags = oldflags;
3139 	return (error);
3140 }
3141 
3142 /*
3143  * Set/clear promiscuous mode on interface ifp based on the truth value
3144  * of pswitch.  The calls are reference counted so that only the first
3145  * "on" request actually has an effect, as does the final "off" request.
3146  * Results are undefined if the "off" and "on" requests are not matched.
3147  */
3148 int
3149 ifpromisc(struct ifnet *ifp, int pswitch)
3150 {
3151 	int error;
3152 	int oldflags = ifp->if_flags;
3153 
3154 	error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC,
3155 			   &ifp->if_pcount, pswitch);
3156 	/* If promiscuous mode status has changed, log a message */
3157 	if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC) &&
3158             log_promisc_mode_change)
3159 		if_printf(ifp, "promiscuous mode %s\n",
3160 		    (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled");
3161 	return (error);
3162 }
3163 
3164 /*
3165  * Return interface configuration
3166  * of system.  List may be used
3167  * in later ioctl's (above) to get
3168  * other information.
3169  */
3170 /*ARGSUSED*/
3171 static int
3172 ifconf(u_long cmd, caddr_t data)
3173 {
3174 	struct ifconf *ifc = (struct ifconf *)data;
3175 	struct ifnet *ifp;
3176 	struct ifaddr *ifa;
3177 	struct ifreq ifr;
3178 	struct sbuf *sb;
3179 	int error, full = 0, valid_len, max_len;
3180 
3181 	/* Limit initial buffer size to maxphys to avoid DoS from userspace. */
3182 	max_len = maxphys - 1;
3183 
3184 	/* Prevent hostile input from being able to crash the system */
3185 	if (ifc->ifc_len <= 0)
3186 		return (EINVAL);
3187 
3188 again:
3189 	if (ifc->ifc_len <= max_len) {
3190 		max_len = ifc->ifc_len;
3191 		full = 1;
3192 	}
3193 	sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN);
3194 	max_len = 0;
3195 	valid_len = 0;
3196 
3197 	IFNET_RLOCK();
3198 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
3199 		struct epoch_tracker et;
3200 		int addrs;
3201 
3202 		/*
3203 		 * Zero the ifr to make sure we don't disclose the contents
3204 		 * of the stack.
3205 		 */
3206 		memset(&ifr, 0, sizeof(ifr));
3207 
3208 		if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
3209 		    >= sizeof(ifr.ifr_name)) {
3210 			sbuf_delete(sb);
3211 			IFNET_RUNLOCK();
3212 			return (ENAMETOOLONG);
3213 		}
3214 
3215 		addrs = 0;
3216 		NET_EPOCH_ENTER(et);
3217 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
3218 			struct sockaddr *sa = ifa->ifa_addr;
3219 
3220 			if (prison_if(curthread->td_ucred, sa) != 0)
3221 				continue;
3222 			addrs++;
3223 			if (sa->sa_len <= sizeof(*sa)) {
3224 				if (sa->sa_len < sizeof(*sa)) {
3225 					memset(&ifr.ifr_ifru.ifru_addr, 0,
3226 					    sizeof(ifr.ifr_ifru.ifru_addr));
3227 					memcpy(&ifr.ifr_ifru.ifru_addr, sa,
3228 					    sa->sa_len);
3229 				} else
3230 					ifr.ifr_ifru.ifru_addr = *sa;
3231 				sbuf_bcat(sb, &ifr, sizeof(ifr));
3232 				max_len += sizeof(ifr);
3233 			} else {
3234 				sbuf_bcat(sb, &ifr,
3235 				    offsetof(struct ifreq, ifr_addr));
3236 				max_len += offsetof(struct ifreq, ifr_addr);
3237 				sbuf_bcat(sb, sa, sa->sa_len);
3238 				max_len += sa->sa_len;
3239 			}
3240 
3241 			if (sbuf_error(sb) == 0)
3242 				valid_len = sbuf_len(sb);
3243 		}
3244 		NET_EPOCH_EXIT(et);
3245 		if (addrs == 0) {
3246 			sbuf_bcat(sb, &ifr, sizeof(ifr));
3247 			max_len += sizeof(ifr);
3248 
3249 			if (sbuf_error(sb) == 0)
3250 				valid_len = sbuf_len(sb);
3251 		}
3252 	}
3253 	IFNET_RUNLOCK();
3254 
3255 	/*
3256 	 * If we didn't allocate enough space (uncommon), try again.  If
3257 	 * we have already allocated as much space as we are allowed,
3258 	 * return what we've got.
3259 	 */
3260 	if (valid_len != max_len && !full) {
3261 		sbuf_delete(sb);
3262 		goto again;
3263 	}
3264 
3265 	ifc->ifc_len = valid_len;
3266 	sbuf_finish(sb);
3267 	error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len);
3268 	sbuf_delete(sb);
3269 	return (error);
3270 }
3271 
3272 /*
3273  * Just like ifpromisc(), but for all-multicast-reception mode.
3274  */
3275 int
3276 if_allmulti(struct ifnet *ifp, int onswitch)
3277 {
3278 
3279 	return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch));
3280 }
3281 
3282 struct ifmultiaddr *
3283 if_findmulti(struct ifnet *ifp, const struct sockaddr *sa)
3284 {
3285 	struct ifmultiaddr *ifma;
3286 
3287 	IF_ADDR_LOCK_ASSERT(ifp);
3288 
3289 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
3290 		if (sa->sa_family == AF_LINK) {
3291 			if (sa_dl_equal(ifma->ifma_addr, sa))
3292 				break;
3293 		} else {
3294 			if (sa_equal(ifma->ifma_addr, sa))
3295 				break;
3296 		}
3297 	}
3298 
3299 	return ifma;
3300 }
3301 
3302 /*
3303  * Allocate a new ifmultiaddr and initialize based on passed arguments.  We
3304  * make copies of passed sockaddrs.  The ifmultiaddr will not be added to
3305  * the ifnet multicast address list here, so the caller must do that and
3306  * other setup work (such as notifying the device driver).  The reference
3307  * count is initialized to 1.
3308  */
3309 static struct ifmultiaddr *
3310 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa,
3311     int mflags)
3312 {
3313 	struct ifmultiaddr *ifma;
3314 	struct sockaddr *dupsa;
3315 
3316 	ifma = malloc(sizeof *ifma, M_IFMADDR, mflags |
3317 	    M_ZERO);
3318 	if (ifma == NULL)
3319 		return (NULL);
3320 
3321 	dupsa = malloc(sa->sa_len, M_IFMADDR, mflags);
3322 	if (dupsa == NULL) {
3323 		free(ifma, M_IFMADDR);
3324 		return (NULL);
3325 	}
3326 	bcopy(sa, dupsa, sa->sa_len);
3327 	ifma->ifma_addr = dupsa;
3328 
3329 	ifma->ifma_ifp = ifp;
3330 	ifma->ifma_refcount = 1;
3331 	ifma->ifma_protospec = NULL;
3332 
3333 	if (llsa == NULL) {
3334 		ifma->ifma_lladdr = NULL;
3335 		return (ifma);
3336 	}
3337 
3338 	dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags);
3339 	if (dupsa == NULL) {
3340 		free(ifma->ifma_addr, M_IFMADDR);
3341 		free(ifma, M_IFMADDR);
3342 		return (NULL);
3343 	}
3344 	bcopy(llsa, dupsa, llsa->sa_len);
3345 	ifma->ifma_lladdr = dupsa;
3346 
3347 	return (ifma);
3348 }
3349 
3350 /*
3351  * if_freemulti: free ifmultiaddr structure and possibly attached related
3352  * addresses.  The caller is responsible for implementing reference
3353  * counting, notifying the driver, handling routing messages, and releasing
3354  * any dependent link layer state.
3355  */
3356 #ifdef MCAST_VERBOSE
3357 extern void kdb_backtrace(void);
3358 #endif
3359 static void
3360 if_freemulti_internal(struct ifmultiaddr *ifma)
3361 {
3362 
3363 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d",
3364 	    ifma->ifma_refcount));
3365 
3366 	if (ifma->ifma_lladdr != NULL)
3367 		free(ifma->ifma_lladdr, M_IFMADDR);
3368 #ifdef MCAST_VERBOSE
3369 	kdb_backtrace();
3370 	printf("%s freeing ifma: %p\n", __func__, ifma);
3371 #endif
3372 	free(ifma->ifma_addr, M_IFMADDR);
3373 	free(ifma, M_IFMADDR);
3374 }
3375 
3376 static void
3377 if_destroymulti(epoch_context_t ctx)
3378 {
3379 	struct ifmultiaddr *ifma;
3380 
3381 	ifma = __containerof(ctx, struct ifmultiaddr, ifma_epoch_ctx);
3382 	if_freemulti_internal(ifma);
3383 }
3384 
3385 void
3386 if_freemulti(struct ifmultiaddr *ifma)
3387 {
3388 	KASSERT(ifma->ifma_refcount == 0, ("if_freemulti_epoch: refcount %d",
3389 	    ifma->ifma_refcount));
3390 
3391 	NET_EPOCH_CALL(if_destroymulti, &ifma->ifma_epoch_ctx);
3392 }
3393 
3394 /*
3395  * Register an additional multicast address with a network interface.
3396  *
3397  * - If the address is already present, bump the reference count on the
3398  *   address and return.
3399  * - If the address is not link-layer, look up a link layer address.
3400  * - Allocate address structures for one or both addresses, and attach to the
3401  *   multicast address list on the interface.  If automatically adding a link
3402  *   layer address, the protocol address will own a reference to the link
3403  *   layer address, to be freed when it is freed.
3404  * - Notify the network device driver of an addition to the multicast address
3405  *   list.
3406  *
3407  * 'sa' points to caller-owned memory with the desired multicast address.
3408  *
3409  * 'retifma' will be used to return a pointer to the resulting multicast
3410  * address reference, if desired.
3411  */
3412 int
3413 if_addmulti(struct ifnet *ifp, struct sockaddr *sa,
3414     struct ifmultiaddr **retifma)
3415 {
3416 	struct ifmultiaddr *ifma, *ll_ifma;
3417 	struct sockaddr *llsa;
3418 	struct sockaddr_dl sdl;
3419 	int error;
3420 
3421 #ifdef INET
3422 	IN_MULTI_LIST_UNLOCK_ASSERT();
3423 #endif
3424 #ifdef INET6
3425 	IN6_MULTI_LIST_UNLOCK_ASSERT();
3426 #endif
3427 	/*
3428 	 * If the address is already present, return a new reference to it;
3429 	 * otherwise, allocate storage and set up a new address.
3430 	 */
3431 	IF_ADDR_WLOCK(ifp);
3432 	ifma = if_findmulti(ifp, sa);
3433 	if (ifma != NULL) {
3434 		ifma->ifma_refcount++;
3435 		if (retifma != NULL)
3436 			*retifma = ifma;
3437 		IF_ADDR_WUNLOCK(ifp);
3438 		return (0);
3439 	}
3440 
3441 	/*
3442 	 * The address isn't already present; resolve the protocol address
3443 	 * into a link layer address, and then look that up, bump its
3444 	 * refcount or allocate an ifma for that also.
3445 	 * Most link layer resolving functions returns address data which
3446 	 * fits inside default sockaddr_dl structure. However callback
3447 	 * can allocate another sockaddr structure, in that case we need to
3448 	 * free it later.
3449 	 */
3450 	llsa = NULL;
3451 	ll_ifma = NULL;
3452 	if (ifp->if_resolvemulti != NULL) {
3453 		/* Provide called function with buffer size information */
3454 		sdl.sdl_len = sizeof(sdl);
3455 		llsa = (struct sockaddr *)&sdl;
3456 		error = ifp->if_resolvemulti(ifp, &llsa, sa);
3457 		if (error)
3458 			goto unlock_out;
3459 	}
3460 
3461 	/*
3462 	 * Allocate the new address.  Don't hook it up yet, as we may also
3463 	 * need to allocate a link layer multicast address.
3464 	 */
3465 	ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT);
3466 	if (ifma == NULL) {
3467 		error = ENOMEM;
3468 		goto free_llsa_out;
3469 	}
3470 
3471 	/*
3472 	 * If a link layer address is found, we'll need to see if it's
3473 	 * already present in the address list, or allocate is as well.
3474 	 * When this block finishes, the link layer address will be on the
3475 	 * list.
3476 	 */
3477 	if (llsa != NULL) {
3478 		ll_ifma = if_findmulti(ifp, llsa);
3479 		if (ll_ifma == NULL) {
3480 			ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT);
3481 			if (ll_ifma == NULL) {
3482 				--ifma->ifma_refcount;
3483 				if_freemulti(ifma);
3484 				error = ENOMEM;
3485 				goto free_llsa_out;
3486 			}
3487 			ll_ifma->ifma_flags |= IFMA_F_ENQUEUED;
3488 			CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma,
3489 			    ifma_link);
3490 		} else
3491 			ll_ifma->ifma_refcount++;
3492 		ifma->ifma_llifma = ll_ifma;
3493 	}
3494 
3495 	/*
3496 	 * We now have a new multicast address, ifma, and possibly a new or
3497 	 * referenced link layer address.  Add the primary address to the
3498 	 * ifnet address list.
3499 	 */
3500 	ifma->ifma_flags |= IFMA_F_ENQUEUED;
3501 	CK_STAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
3502 
3503 	if (retifma != NULL)
3504 		*retifma = ifma;
3505 
3506 	/*
3507 	 * Must generate the message while holding the lock so that 'ifma'
3508 	 * pointer is still valid.
3509 	 */
3510 	rt_newmaddrmsg(RTM_NEWMADDR, ifma);
3511 	IF_ADDR_WUNLOCK(ifp);
3512 
3513 	/*
3514 	 * We are certain we have added something, so call down to the
3515 	 * interface to let them know about it.
3516 	 */
3517 	if (ifp->if_ioctl != NULL) {
3518 		if (THREAD_CAN_SLEEP())
3519 			(void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3520 		else
3521 			taskqueue_enqueue(taskqueue_swi, &ifp->if_addmultitask);
3522 	}
3523 
3524 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3525 		link_free_sdl(llsa);
3526 
3527 	return (0);
3528 
3529 free_llsa_out:
3530 	if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl))
3531 		link_free_sdl(llsa);
3532 
3533 unlock_out:
3534 	IF_ADDR_WUNLOCK(ifp);
3535 	return (error);
3536 }
3537 
3538 static void
3539 if_siocaddmulti(void *arg, int pending)
3540 {
3541 	struct ifnet *ifp;
3542 
3543 	ifp = arg;
3544 #ifdef DIAGNOSTIC
3545 	if (pending > 1)
3546 		if_printf(ifp, "%d SIOCADDMULTI coalesced\n", pending);
3547 #endif
3548 	CURVNET_SET(ifp->if_vnet);
3549 	(void )(*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0);
3550 	CURVNET_RESTORE();
3551 }
3552 
3553 /*
3554  * Delete a multicast group membership by network-layer group address.
3555  *
3556  * Returns ENOENT if the entry could not be found. If ifp no longer
3557  * exists, results are undefined. This entry point should only be used
3558  * from subsystems which do appropriate locking to hold ifp for the
3559  * duration of the call.
3560  * Network-layer protocol domains must use if_delmulti_ifma().
3561  */
3562 int
3563 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
3564 {
3565 	struct ifmultiaddr *ifma;
3566 	int lastref;
3567 
3568 	KASSERT(ifp, ("%s: NULL ifp", __func__));
3569 
3570 	IF_ADDR_WLOCK(ifp);
3571 	lastref = 0;
3572 	ifma = if_findmulti(ifp, sa);
3573 	if (ifma != NULL)
3574 		lastref = if_delmulti_locked(ifp, ifma, 0);
3575 	IF_ADDR_WUNLOCK(ifp);
3576 
3577 	if (ifma == NULL)
3578 		return (ENOENT);
3579 
3580 	if (lastref && ifp->if_ioctl != NULL) {
3581 		(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3582 	}
3583 
3584 	return (0);
3585 }
3586 
3587 /*
3588  * Delete all multicast group membership for an interface.
3589  * Should be used to quickly flush all multicast filters.
3590  */
3591 void
3592 if_delallmulti(struct ifnet *ifp)
3593 {
3594 	struct ifmultiaddr *ifma;
3595 	struct ifmultiaddr *next;
3596 
3597 	IF_ADDR_WLOCK(ifp);
3598 	CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next)
3599 		if_delmulti_locked(ifp, ifma, 0);
3600 	IF_ADDR_WUNLOCK(ifp);
3601 }
3602 
3603 void
3604 if_delmulti_ifma(struct ifmultiaddr *ifma)
3605 {
3606 	if_delmulti_ifma_flags(ifma, 0);
3607 }
3608 
3609 /*
3610  * Delete a multicast group membership by group membership pointer.
3611  * Network-layer protocol domains must use this routine.
3612  *
3613  * It is safe to call this routine if the ifp disappeared.
3614  */
3615 void
3616 if_delmulti_ifma_flags(struct ifmultiaddr *ifma, int flags)
3617 {
3618 	struct ifnet *ifp;
3619 	int lastref;
3620 	MCDPRINTF("%s freeing ifma: %p\n", __func__, ifma);
3621 #ifdef INET
3622 	IN_MULTI_LIST_UNLOCK_ASSERT();
3623 #endif
3624 	ifp = ifma->ifma_ifp;
3625 #ifdef DIAGNOSTIC
3626 	if (ifp == NULL) {
3627 		printf("%s: ifma_ifp seems to be detached\n", __func__);
3628 	} else {
3629 		struct epoch_tracker et;
3630 		struct ifnet *oifp;
3631 
3632 		NET_EPOCH_ENTER(et);
3633 		CK_STAILQ_FOREACH(oifp, &V_ifnet, if_link)
3634 			if (ifp == oifp)
3635 				break;
3636 		NET_EPOCH_EXIT(et);
3637 		if (ifp != oifp)
3638 			ifp = NULL;
3639 	}
3640 #endif
3641 	/*
3642 	 * If and only if the ifnet instance exists: Acquire the address lock.
3643 	 */
3644 	if (ifp != NULL)
3645 		IF_ADDR_WLOCK(ifp);
3646 
3647 	lastref = if_delmulti_locked(ifp, ifma, flags);
3648 
3649 	if (ifp != NULL) {
3650 		/*
3651 		 * If and only if the ifnet instance exists:
3652 		 *  Release the address lock.
3653 		 *  If the group was left: update the hardware hash filter.
3654 		 */
3655 		IF_ADDR_WUNLOCK(ifp);
3656 		if (lastref && ifp->if_ioctl != NULL) {
3657 			(void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0);
3658 		}
3659 	}
3660 }
3661 
3662 /*
3663  * Perform deletion of network-layer and/or link-layer multicast address.
3664  *
3665  * Return 0 if the reference count was decremented.
3666  * Return 1 if the final reference was released, indicating that the
3667  * hardware hash filter should be reprogrammed.
3668  */
3669 static int
3670 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching)
3671 {
3672 	struct ifmultiaddr *ll_ifma;
3673 
3674 	if (ifp != NULL && ifma->ifma_ifp != NULL) {
3675 		KASSERT(ifma->ifma_ifp == ifp,
3676 		    ("%s: inconsistent ifp %p", __func__, ifp));
3677 		IF_ADDR_WLOCK_ASSERT(ifp);
3678 	}
3679 
3680 	ifp = ifma->ifma_ifp;
3681 	MCDPRINTF("%s freeing %p from %s \n", __func__, ifma, ifp ? ifp->if_xname : "");
3682 
3683 	/*
3684 	 * If the ifnet is detaching, null out references to ifnet,
3685 	 * so that upper protocol layers will notice, and not attempt
3686 	 * to obtain locks for an ifnet which no longer exists. The
3687 	 * routing socket announcement must happen before the ifnet
3688 	 * instance is detached from the system.
3689 	 */
3690 	if (detaching) {
3691 #ifdef DIAGNOSTIC
3692 		printf("%s: detaching ifnet instance %p\n", __func__, ifp);
3693 #endif
3694 		/*
3695 		 * ifp may already be nulled out if we are being reentered
3696 		 * to delete the ll_ifma.
3697 		 */
3698 		if (ifp != NULL) {
3699 			rt_newmaddrmsg(RTM_DELMADDR, ifma);
3700 			ifma->ifma_ifp = NULL;
3701 		}
3702 	}
3703 
3704 	if (--ifma->ifma_refcount > 0)
3705 		return 0;
3706 
3707 	if (ifp != NULL && detaching == 0 && (ifma->ifma_flags & IFMA_F_ENQUEUED)) {
3708 		CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifmultiaddr, ifma_link);
3709 		ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
3710 	}
3711 	/*
3712 	 * If this ifma is a network-layer ifma, a link-layer ifma may
3713 	 * have been associated with it. Release it first if so.
3714 	 */
3715 	ll_ifma = ifma->ifma_llifma;
3716 	if (ll_ifma != NULL) {
3717 		KASSERT(ifma->ifma_lladdr != NULL,
3718 		    ("%s: llifma w/o lladdr", __func__));
3719 		if (detaching)
3720 			ll_ifma->ifma_ifp = NULL;	/* XXX */
3721 		if (--ll_ifma->ifma_refcount == 0) {
3722 			if (ifp != NULL) {
3723 				if (ll_ifma->ifma_flags & IFMA_F_ENQUEUED) {
3724 					CK_STAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifmultiaddr,
3725 						ifma_link);
3726 					ll_ifma->ifma_flags &= ~IFMA_F_ENQUEUED;
3727 				}
3728 			}
3729 			if_freemulti(ll_ifma);
3730 		}
3731 	}
3732 #ifdef INVARIANTS
3733 	if (ifp) {
3734 		struct ifmultiaddr *ifmatmp;
3735 
3736 		CK_STAILQ_FOREACH(ifmatmp, &ifp->if_multiaddrs, ifma_link)
3737 			MPASS(ifma != ifmatmp);
3738 	}
3739 #endif
3740 	if_freemulti(ifma);
3741 	/*
3742 	 * The last reference to this instance of struct ifmultiaddr
3743 	 * was released; the hardware should be notified of this change.
3744 	 */
3745 	return 1;
3746 }
3747 
3748 /*
3749  * Set the link layer address on an interface.
3750  *
3751  * At this time we only support certain types of interfaces,
3752  * and we don't allow the length of the address to change.
3753  *
3754  * Set noinline to be dtrace-friendly
3755  */
3756 __noinline int
3757 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
3758 {
3759 	struct sockaddr_dl *sdl;
3760 	struct ifaddr *ifa;
3761 	struct ifreq ifr;
3762 
3763 	ifa = ifp->if_addr;
3764 	if (ifa == NULL)
3765 		return (EINVAL);
3766 
3767 	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
3768 	if (sdl == NULL)
3769 		return (EINVAL);
3770 
3771 	if (len != sdl->sdl_alen)	/* don't allow length to change */
3772 		return (EINVAL);
3773 
3774 	switch (ifp->if_type) {
3775 	case IFT_ETHER:
3776 	case IFT_XETHER:
3777 	case IFT_L2VLAN:
3778 	case IFT_BRIDGE:
3779 	case IFT_IEEE8023ADLAG:
3780 		bcopy(lladdr, LLADDR(sdl), len);
3781 		break;
3782 	default:
3783 		return (ENODEV);
3784 	}
3785 
3786 	/*
3787 	 * If the interface is already up, we need
3788 	 * to re-init it in order to reprogram its
3789 	 * address filter.
3790 	 */
3791 	if ((ifp->if_flags & IFF_UP) != 0) {
3792 		if (ifp->if_ioctl) {
3793 			ifp->if_flags &= ~IFF_UP;
3794 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3795 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3796 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3797 			ifp->if_flags |= IFF_UP;
3798 			ifr.ifr_flags = ifp->if_flags & 0xffff;
3799 			ifr.ifr_flagshigh = ifp->if_flags >> 16;
3800 			(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
3801 		}
3802 	}
3803 	EVENTHANDLER_INVOKE(iflladdr_event, ifp);
3804 
3805 	return (0);
3806 }
3807 
3808 /*
3809  * Compat function for handling basic encapsulation requests.
3810  * Not converted stacks (FDDI, IB, ..) supports traditional
3811  * output model: ARP (and other similar L2 protocols) are handled
3812  * inside output routine, arpresolve/nd6_resolve() returns MAC
3813  * address instead of full prepend.
3814  *
3815  * This function creates calculated header==MAC for IPv4/IPv6 and
3816  * returns EAFNOSUPPORT (which is then handled in ARP code) for other
3817  * address families.
3818  */
3819 static int
3820 if_requestencap_default(struct ifnet *ifp, struct if_encap_req *req)
3821 {
3822 
3823 	if (req->rtype != IFENCAP_LL)
3824 		return (EOPNOTSUPP);
3825 
3826 	if (req->bufsize < req->lladdr_len)
3827 		return (ENOMEM);
3828 
3829 	switch (req->family) {
3830 	case AF_INET:
3831 	case AF_INET6:
3832 		break;
3833 	default:
3834 		return (EAFNOSUPPORT);
3835 	}
3836 
3837 	/* Copy lladdr to storage as is */
3838 	memmove(req->buf, req->lladdr, req->lladdr_len);
3839 	req->bufsize = req->lladdr_len;
3840 	req->lladdr_off = 0;
3841 
3842 	return (0);
3843 }
3844 
3845 /*
3846  * Tunnel interfaces can nest, also they may cause infinite recursion
3847  * calls when misconfigured. We'll prevent this by detecting loops.
3848  * High nesting level may cause stack exhaustion. We'll prevent this
3849  * by introducing upper limit.
3850  *
3851  * Return 0, if tunnel nesting count is equal or less than limit.
3852  */
3853 int
3854 if_tunnel_check_nesting(struct ifnet *ifp, struct mbuf *m, uint32_t cookie,
3855     int limit)
3856 {
3857 	struct m_tag *mtag;
3858 	int count;
3859 
3860 	count = 1;
3861 	mtag = NULL;
3862 	while ((mtag = m_tag_locate(m, cookie, 0, mtag)) != NULL) {
3863 		if (*(struct ifnet **)(mtag + 1) == ifp) {
3864 			log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp));
3865 			return (EIO);
3866 		}
3867 		count++;
3868 	}
3869 	if (count > limit) {
3870 		log(LOG_NOTICE,
3871 		    "%s: if_output recursively called too many times(%d)\n",
3872 		    if_name(ifp), count);
3873 		return (EIO);
3874 	}
3875 	mtag = m_tag_alloc(cookie, 0, sizeof(struct ifnet *), M_NOWAIT);
3876 	if (mtag == NULL)
3877 		return (ENOMEM);
3878 	*(struct ifnet **)(mtag + 1) = ifp;
3879 	m_tag_prepend(m, mtag);
3880 	return (0);
3881 }
3882 
3883 /*
3884  * Get the link layer address that was read from the hardware at attach.
3885  *
3886  * This is only set by Ethernet NICs (IFT_ETHER), but laggX interfaces re-type
3887  * their component interfaces as IFT_IEEE8023ADLAG.
3888  */
3889 int
3890 if_gethwaddr(struct ifnet *ifp, struct ifreq *ifr)
3891 {
3892 
3893 	if (ifp->if_hw_addr == NULL)
3894 		return (ENODEV);
3895 
3896 	switch (ifp->if_type) {
3897 	case IFT_ETHER:
3898 	case IFT_IEEE8023ADLAG:
3899 		bcopy(ifp->if_hw_addr, ifr->ifr_addr.sa_data, ifp->if_addrlen);
3900 		return (0);
3901 	default:
3902 		return (ENODEV);
3903 	}
3904 }
3905 
3906 /*
3907  * The name argument must be a pointer to storage which will last as
3908  * long as the interface does.  For physical devices, the result of
3909  * device_get_name(dev) is a good choice and for pseudo-devices a
3910  * static string works well.
3911  */
3912 void
3913 if_initname(struct ifnet *ifp, const char *name, int unit)
3914 {
3915 	ifp->if_dname = name;
3916 	ifp->if_dunit = unit;
3917 	if (unit != IF_DUNIT_NONE)
3918 		snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
3919 	else
3920 		strlcpy(ifp->if_xname, name, IFNAMSIZ);
3921 }
3922 
3923 static int
3924 if_vlog(struct ifnet *ifp, int pri, const char *fmt, va_list ap)
3925 {
3926 	char if_fmt[256];
3927 
3928 	snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt);
3929 	vlog(pri, if_fmt, ap);
3930 	return (0);
3931 }
3932 
3933 
3934 int
3935 if_printf(struct ifnet *ifp, const char *fmt, ...)
3936 {
3937 	va_list ap;
3938 
3939 	va_start(ap, fmt);
3940 	if_vlog(ifp, LOG_INFO, fmt, ap);
3941 	va_end(ap);
3942 	return (0);
3943 }
3944 
3945 int
3946 if_log(struct ifnet *ifp, int pri, const char *fmt, ...)
3947 {
3948 	va_list ap;
3949 
3950 	va_start(ap, fmt);
3951 	if_vlog(ifp, pri, fmt, ap);
3952 	va_end(ap);
3953 	return (0);
3954 }
3955 
3956 void
3957 if_start(struct ifnet *ifp)
3958 {
3959 
3960 	(*(ifp)->if_start)(ifp);
3961 }
3962 
3963 /*
3964  * Backwards compatibility interface for drivers
3965  * that have not implemented it
3966  */
3967 static int
3968 if_transmit(struct ifnet *ifp, struct mbuf *m)
3969 {
3970 	int error;
3971 
3972 	IFQ_HANDOFF(ifp, m, error);
3973 	return (error);
3974 }
3975 
3976 static void
3977 if_input_default(struct ifnet *ifp __unused, struct mbuf *m)
3978 {
3979 
3980 	m_freem(m);
3981 }
3982 
3983 int
3984 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
3985 {
3986 	int active = 0;
3987 
3988 	IF_LOCK(ifq);
3989 	if (_IF_QFULL(ifq)) {
3990 		IF_UNLOCK(ifq);
3991 		if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
3992 		m_freem(m);
3993 		return (0);
3994 	}
3995 	if (ifp != NULL) {
3996 		if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust);
3997 		if (m->m_flags & (M_BCAST|M_MCAST))
3998 			if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
3999 		active = ifp->if_drv_flags & IFF_DRV_OACTIVE;
4000 	}
4001 	_IF_ENQUEUE(ifq, m);
4002 	IF_UNLOCK(ifq);
4003 	if (ifp != NULL && !active)
4004 		(*(ifp)->if_start)(ifp);
4005 	return (1);
4006 }
4007 
4008 void
4009 if_register_com_alloc(u_char type,
4010     if_com_alloc_t *a, if_com_free_t *f)
4011 {
4012 
4013 	KASSERT(if_com_alloc[type] == NULL,
4014 	    ("if_register_com_alloc: %d already registered", type));
4015 	KASSERT(if_com_free[type] == NULL,
4016 	    ("if_register_com_alloc: %d free already registered", type));
4017 
4018 	if_com_alloc[type] = a;
4019 	if_com_free[type] = f;
4020 }
4021 
4022 void
4023 if_deregister_com_alloc(u_char type)
4024 {
4025 
4026 	KASSERT(if_com_alloc[type] != NULL,
4027 	    ("if_deregister_com_alloc: %d not registered", type));
4028 	KASSERT(if_com_free[type] != NULL,
4029 	    ("if_deregister_com_alloc: %d free not registered", type));
4030 
4031 	/*
4032 	 * Ensure all pending EPOCH(9) callbacks have been executed. This
4033 	 * fixes issues about late invocation of if_destroy(), which leads
4034 	 * to memory leak from if_com_alloc[type] allocated if_l2com.
4035 	 */
4036 	epoch_drain_callbacks(net_epoch_preempt);
4037 
4038 	if_com_alloc[type] = NULL;
4039 	if_com_free[type] = NULL;
4040 }
4041 
4042 /* API for driver access to network stack owned ifnet.*/
4043 uint64_t
4044 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate)
4045 {
4046 	uint64_t oldbrate;
4047 
4048 	oldbrate = ifp->if_baudrate;
4049 	ifp->if_baudrate = baudrate;
4050 	return (oldbrate);
4051 }
4052 
4053 uint64_t
4054 if_getbaudrate(if_t ifp)
4055 {
4056 
4057 	return (((struct ifnet *)ifp)->if_baudrate);
4058 }
4059 
4060 int
4061 if_setcapabilities(if_t ifp, int capabilities)
4062 {
4063 	((struct ifnet *)ifp)->if_capabilities = capabilities;
4064 	return (0);
4065 }
4066 
4067 int
4068 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit)
4069 {
4070 	((struct ifnet *)ifp)->if_capabilities |= setbit;
4071 	((struct ifnet *)ifp)->if_capabilities &= ~clearbit;
4072 
4073 	return (0);
4074 }
4075 
4076 int
4077 if_getcapabilities(if_t ifp)
4078 {
4079 	return ((struct ifnet *)ifp)->if_capabilities;
4080 }
4081 
4082 int
4083 if_setcapenable(if_t ifp, int capabilities)
4084 {
4085 	((struct ifnet *)ifp)->if_capenable = capabilities;
4086 	return (0);
4087 }
4088 
4089 int
4090 if_setcapenablebit(if_t ifp, int setcap, int clearcap)
4091 {
4092 	if(setcap)
4093 		((struct ifnet *)ifp)->if_capenable |= setcap;
4094 	if(clearcap)
4095 		((struct ifnet *)ifp)->if_capenable &= ~clearcap;
4096 
4097 	return (0);
4098 }
4099 
4100 const char *
4101 if_getdname(if_t ifp)
4102 {
4103 	return ((struct ifnet *)ifp)->if_dname;
4104 }
4105 
4106 int
4107 if_togglecapenable(if_t ifp, int togglecap)
4108 {
4109 	((struct ifnet *)ifp)->if_capenable ^= togglecap;
4110 	return (0);
4111 }
4112 
4113 int
4114 if_getcapenable(if_t ifp)
4115 {
4116 	return ((struct ifnet *)ifp)->if_capenable;
4117 }
4118 
4119 /*
4120  * This is largely undesirable because it ties ifnet to a device, but does
4121  * provide flexiblity for an embedded product vendor. Should be used with
4122  * the understanding that it violates the interface boundaries, and should be
4123  * a last resort only.
4124  */
4125 int
4126 if_setdev(if_t ifp, void *dev)
4127 {
4128 	return (0);
4129 }
4130 
4131 int
4132 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags)
4133 {
4134 	((struct ifnet *)ifp)->if_drv_flags |= set_flags;
4135 	((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags;
4136 
4137 	return (0);
4138 }
4139 
4140 int
4141 if_getdrvflags(if_t ifp)
4142 {
4143 	return ((struct ifnet *)ifp)->if_drv_flags;
4144 }
4145 
4146 int
4147 if_setdrvflags(if_t ifp, int flags)
4148 {
4149 	((struct ifnet *)ifp)->if_drv_flags = flags;
4150 	return (0);
4151 }
4152 
4153 int
4154 if_setflags(if_t ifp, int flags)
4155 {
4156 
4157 	ifp->if_flags = flags;
4158 	return (0);
4159 }
4160 
4161 int
4162 if_setflagbits(if_t ifp, int set, int clear)
4163 {
4164 	((struct ifnet *)ifp)->if_flags |= set;
4165 	((struct ifnet *)ifp)->if_flags &= ~clear;
4166 
4167 	return (0);
4168 }
4169 
4170 int
4171 if_getflags(if_t ifp)
4172 {
4173 	return ((struct ifnet *)ifp)->if_flags;
4174 }
4175 
4176 int
4177 if_clearhwassist(if_t ifp)
4178 {
4179 	((struct ifnet *)ifp)->if_hwassist = 0;
4180 	return (0);
4181 }
4182 
4183 int
4184 if_sethwassistbits(if_t ifp, int toset, int toclear)
4185 {
4186 	((struct ifnet *)ifp)->if_hwassist |= toset;
4187 	((struct ifnet *)ifp)->if_hwassist &= ~toclear;
4188 
4189 	return (0);
4190 }
4191 
4192 int
4193 if_sethwassist(if_t ifp, int hwassist_bit)
4194 {
4195 	((struct ifnet *)ifp)->if_hwassist = hwassist_bit;
4196 	return (0);
4197 }
4198 
4199 int
4200 if_gethwassist(if_t ifp)
4201 {
4202 	return ((struct ifnet *)ifp)->if_hwassist;
4203 }
4204 
4205 int
4206 if_setmtu(if_t ifp, int mtu)
4207 {
4208 	((struct ifnet *)ifp)->if_mtu = mtu;
4209 	return (0);
4210 }
4211 
4212 int
4213 if_getmtu(if_t ifp)
4214 {
4215 	return ((struct ifnet *)ifp)->if_mtu;
4216 }
4217 
4218 int
4219 if_getmtu_family(if_t ifp, int family)
4220 {
4221 	struct domain *dp;
4222 
4223 	for (dp = domains; dp; dp = dp->dom_next) {
4224 		if (dp->dom_family == family && dp->dom_ifmtu != NULL)
4225 			return (dp->dom_ifmtu((struct ifnet *)ifp));
4226 	}
4227 
4228 	return (((struct ifnet *)ifp)->if_mtu);
4229 }
4230 
4231 /*
4232  * Methods for drivers to access interface unicast and multicast
4233  * link level addresses.  Driver shall not know 'struct ifaddr' neither
4234  * 'struct ifmultiaddr'.
4235  */
4236 u_int
4237 if_lladdr_count(if_t ifp)
4238 {
4239 	struct epoch_tracker et;
4240 	struct ifaddr *ifa;
4241 	u_int count;
4242 
4243 	count = 0;
4244 	NET_EPOCH_ENTER(et);
4245 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
4246 		if (ifa->ifa_addr->sa_family == AF_LINK)
4247 			count++;
4248 	NET_EPOCH_EXIT(et);
4249 
4250 	return (count);
4251 }
4252 
4253 u_int
4254 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
4255 {
4256 	struct epoch_tracker et;
4257 	struct ifaddr *ifa;
4258 	u_int count;
4259 
4260 	MPASS(cb);
4261 
4262 	count = 0;
4263 	NET_EPOCH_ENTER(et);
4264 	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
4265 		if (ifa->ifa_addr->sa_family != AF_LINK)
4266 			continue;
4267 		count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr,
4268 		    count);
4269 	}
4270 	NET_EPOCH_EXIT(et);
4271 
4272 	return (count);
4273 }
4274 
4275 u_int
4276 if_llmaddr_count(if_t ifp)
4277 {
4278 	struct epoch_tracker et;
4279 	struct ifmultiaddr *ifma;
4280 	int count;
4281 
4282 	count = 0;
4283 	NET_EPOCH_ENTER(et);
4284 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
4285 		if (ifma->ifma_addr->sa_family == AF_LINK)
4286 			count++;
4287 	NET_EPOCH_EXIT(et);
4288 
4289 	return (count);
4290 }
4291 
4292 u_int
4293 if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
4294 {
4295 	struct epoch_tracker et;
4296 	struct ifmultiaddr *ifma;
4297 	u_int count;
4298 
4299 	MPASS(cb);
4300 
4301 	count = 0;
4302 	NET_EPOCH_ENTER(et);
4303 	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
4304 		if (ifma->ifma_addr->sa_family != AF_LINK)
4305 			continue;
4306 		count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr,
4307 		    count);
4308 	}
4309 	NET_EPOCH_EXIT(et);
4310 
4311 	return (count);
4312 }
4313 
4314 int
4315 if_setsoftc(if_t ifp, void *softc)
4316 {
4317 	((struct ifnet *)ifp)->if_softc = softc;
4318 	return (0);
4319 }
4320 
4321 void *
4322 if_getsoftc(if_t ifp)
4323 {
4324 	return ((struct ifnet *)ifp)->if_softc;
4325 }
4326 
4327 void
4328 if_setrcvif(struct mbuf *m, if_t ifp)
4329 {
4330 
4331 	MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
4332 	m->m_pkthdr.rcvif = (struct ifnet *)ifp;
4333 }
4334 
4335 void
4336 if_setvtag(struct mbuf *m, uint16_t tag)
4337 {
4338 	m->m_pkthdr.ether_vtag = tag;
4339 }
4340 
4341 uint16_t
4342 if_getvtag(struct mbuf *m)
4343 {
4344 
4345 	return (m->m_pkthdr.ether_vtag);
4346 }
4347 
4348 int
4349 if_sendq_empty(if_t ifp)
4350 {
4351 	return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd);
4352 }
4353 
4354 struct ifaddr *
4355 if_getifaddr(if_t ifp)
4356 {
4357 	return ((struct ifnet *)ifp)->if_addr;
4358 }
4359 
4360 int
4361 if_getamcount(if_t ifp)
4362 {
4363 	return ((struct ifnet *)ifp)->if_amcount;
4364 }
4365 
4366 int
4367 if_setsendqready(if_t ifp)
4368 {
4369 	IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd);
4370 	return (0);
4371 }
4372 
4373 int
4374 if_setsendqlen(if_t ifp, int tx_desc_count)
4375 {
4376 	IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count);
4377 	((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count;
4378 
4379 	return (0);
4380 }
4381 
4382 int
4383 if_vlantrunkinuse(if_t ifp)
4384 {
4385 	return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0;
4386 }
4387 
4388 int
4389 if_input(if_t ifp, struct mbuf* sendmp)
4390 {
4391 	(*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp);
4392 	return (0);
4393 
4394 }
4395 
4396 struct mbuf *
4397 if_dequeue(if_t ifp)
4398 {
4399 	struct mbuf *m;
4400 	IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m);
4401 
4402 	return (m);
4403 }
4404 
4405 int
4406 if_sendq_prepend(if_t ifp, struct mbuf *m)
4407 {
4408 	IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m);
4409 	return (0);
4410 }
4411 
4412 int
4413 if_setifheaderlen(if_t ifp, int len)
4414 {
4415 	((struct ifnet *)ifp)->if_hdrlen = len;
4416 	return (0);
4417 }
4418 
4419 caddr_t
4420 if_getlladdr(if_t ifp)
4421 {
4422 	return (IF_LLADDR((struct ifnet *)ifp));
4423 }
4424 
4425 void *
4426 if_gethandle(u_char type)
4427 {
4428 	return (if_alloc(type));
4429 }
4430 
4431 void
4432 if_bpfmtap(if_t ifh, struct mbuf *m)
4433 {
4434 	struct ifnet *ifp = (struct ifnet *)ifh;
4435 
4436 	BPF_MTAP(ifp, m);
4437 }
4438 
4439 void
4440 if_etherbpfmtap(if_t ifh, struct mbuf *m)
4441 {
4442 	struct ifnet *ifp = (struct ifnet *)ifh;
4443 
4444 	ETHER_BPF_MTAP(ifp, m);
4445 }
4446 
4447 void
4448 if_vlancap(if_t ifh)
4449 {
4450 	struct ifnet *ifp = (struct ifnet *)ifh;
4451 	VLAN_CAPABILITIES(ifp);
4452 }
4453 
4454 int
4455 if_sethwtsomax(if_t ifp, u_int if_hw_tsomax)
4456 {
4457 
4458 	((struct ifnet *)ifp)->if_hw_tsomax = if_hw_tsomax;
4459         return (0);
4460 }
4461 
4462 int
4463 if_sethwtsomaxsegcount(if_t ifp, u_int if_hw_tsomaxsegcount)
4464 {
4465 
4466 	((struct ifnet *)ifp)->if_hw_tsomaxsegcount = if_hw_tsomaxsegcount;
4467         return (0);
4468 }
4469 
4470 int
4471 if_sethwtsomaxsegsize(if_t ifp, u_int if_hw_tsomaxsegsize)
4472 {
4473 
4474 	((struct ifnet *)ifp)->if_hw_tsomaxsegsize = if_hw_tsomaxsegsize;
4475         return (0);
4476 }
4477 
4478 u_int
4479 if_gethwtsomax(if_t ifp)
4480 {
4481 
4482 	return (((struct ifnet *)ifp)->if_hw_tsomax);
4483 }
4484 
4485 u_int
4486 if_gethwtsomaxsegcount(if_t ifp)
4487 {
4488 
4489 	return (((struct ifnet *)ifp)->if_hw_tsomaxsegcount);
4490 }
4491 
4492 u_int
4493 if_gethwtsomaxsegsize(if_t ifp)
4494 {
4495 
4496 	return (((struct ifnet *)ifp)->if_hw_tsomaxsegsize);
4497 }
4498 
4499 void
4500 if_setinitfn(if_t ifp, void (*init_fn)(void *))
4501 {
4502 	((struct ifnet *)ifp)->if_init = init_fn;
4503 }
4504 
4505 void
4506 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t))
4507 {
4508 	((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn;
4509 }
4510 
4511 void
4512 if_setstartfn(if_t ifp, void (*start_fn)(if_t))
4513 {
4514 	((struct ifnet *)ifp)->if_start = (void *)start_fn;
4515 }
4516 
4517 void
4518 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn)
4519 {
4520 	((struct ifnet *)ifp)->if_transmit = start_fn;
4521 }
4522 
4523 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn)
4524 {
4525 	((struct ifnet *)ifp)->if_qflush = flush_fn;
4526 
4527 }
4528 
4529 void
4530 if_setgetcounterfn(if_t ifp, if_get_counter_t fn)
4531 {
4532 
4533 	ifp->if_get_counter = fn;
4534 }
4535 
4536 #ifdef DDB
4537 static void
4538 if_show_ifnet(struct ifnet *ifp)
4539 {
4540 
4541 	if (ifp == NULL)
4542 		return;
4543 	db_printf("%s:\n", ifp->if_xname);
4544 #define	IF_DB_PRINTF(f, e)	db_printf("   %s = " f "\n", #e, ifp->e);
4545 	IF_DB_PRINTF("%s", if_dname);
4546 	IF_DB_PRINTF("%d", if_dunit);
4547 	IF_DB_PRINTF("%s", if_description);
4548 	IF_DB_PRINTF("%u", if_index);
4549 	IF_DB_PRINTF("%u", if_refcount);
4550 	IF_DB_PRINTF("%d", if_index_reserved);
4551 	IF_DB_PRINTF("%p", if_softc);
4552 	IF_DB_PRINTF("%p", if_l2com);
4553 	IF_DB_PRINTF("%p", if_llsoftc);
4554 	IF_DB_PRINTF("%d", if_amcount);
4555 	IF_DB_PRINTF("%p", if_addr);
4556 	IF_DB_PRINTF("%p", if_broadcastaddr);
4557 	IF_DB_PRINTF("%p", if_afdata);
4558 	IF_DB_PRINTF("%d", if_afdata_initialized);
4559 	IF_DB_PRINTF("%u", if_fib);
4560 	IF_DB_PRINTF("%p", if_vnet);
4561 	IF_DB_PRINTF("%p", if_home_vnet);
4562 	IF_DB_PRINTF("%p", if_vlantrunk);
4563 	IF_DB_PRINTF("%p", if_bpf);
4564 	IF_DB_PRINTF("%u", if_pcount);
4565 	IF_DB_PRINTF("%p", if_bridge);
4566 	IF_DB_PRINTF("%p", if_lagg);
4567 	IF_DB_PRINTF("%p", if_pf_kif);
4568 	IF_DB_PRINTF("%p", if_carp);
4569 	IF_DB_PRINTF("%p", if_label);
4570 	IF_DB_PRINTF("%p", if_netmap);
4571 	IF_DB_PRINTF("0x%08x", if_flags);
4572 	IF_DB_PRINTF("0x%08x", if_drv_flags);
4573 	IF_DB_PRINTF("0x%08x", if_capabilities);
4574 	IF_DB_PRINTF("0x%08x", if_capenable);
4575 	IF_DB_PRINTF("%p", if_snd.ifq_head);
4576 	IF_DB_PRINTF("%p", if_snd.ifq_tail);
4577 	IF_DB_PRINTF("%d", if_snd.ifq_len);
4578 	IF_DB_PRINTF("%d", if_snd.ifq_maxlen);
4579 	IF_DB_PRINTF("%p", if_snd.ifq_drv_head);
4580 	IF_DB_PRINTF("%p", if_snd.ifq_drv_tail);
4581 	IF_DB_PRINTF("%d", if_snd.ifq_drv_len);
4582 	IF_DB_PRINTF("%d", if_snd.ifq_drv_maxlen);
4583 	IF_DB_PRINTF("%d", if_snd.altq_type);
4584 	IF_DB_PRINTF("%x", if_snd.altq_flags);
4585 #undef IF_DB_PRINTF
4586 }
4587 
4588 DB_SHOW_COMMAND(ifnet, db_show_ifnet)
4589 {
4590 
4591 	if (!have_addr) {
4592 		db_printf("usage: show ifnet <struct ifnet *>\n");
4593 		return;
4594 	}
4595 
4596 	if_show_ifnet((struct ifnet *)addr);
4597 }
4598 
4599 DB_SHOW_ALL_COMMAND(ifnets, db_show_all_ifnets)
4600 {
4601 	VNET_ITERATOR_DECL(vnet_iter);
4602 	struct ifnet *ifp;
4603 	u_short idx;
4604 
4605 	VNET_FOREACH(vnet_iter) {
4606 		CURVNET_SET_QUIET(vnet_iter);
4607 #ifdef VIMAGE
4608 		db_printf("vnet=%p\n", curvnet);
4609 #endif
4610 		for (idx = 1; idx <= V_if_index; idx++) {
4611 			ifp = V_ifindex_table[idx];
4612 			if (ifp == NULL)
4613 				continue;
4614 			db_printf( "%20s ifp=%p\n", ifp->if_xname, ifp);
4615 			if (db_pager_quit)
4616 				break;
4617 		}
4618 		CURVNET_RESTORE();
4619 	}
4620 }
4621 #endif	/* DDB */
4622