xref: /freebsd/sys/net/if_var.h (revision a9e8641da961bcf3d24afc85fd657f2083a872a2)
1 /*-
2  * Copyright (c) 1982, 1986, 1989, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *	From: @(#)if.h	8.1 (Berkeley) 6/10/93
30  * $FreeBSD$
31  */
32 
33 #ifndef	_NET_IF_VAR_H_
34 #define	_NET_IF_VAR_H_
35 
36 /*
37  * Structures defining a network interface, providing a packet
38  * transport mechanism (ala level 0 of the PUP protocols).
39  *
40  * Each interface accepts output datagrams of a specified maximum
41  * length, and provides higher level routines with input datagrams
42  * received from its medium.
43  *
44  * Output occurs when the routine if_output is called, with three parameters:
45  *	(*ifp->if_output)(ifp, m, dst, rt)
46  * Here m is the mbuf chain to be sent and dst is the destination address.
47  * The output routine encapsulates the supplied datagram if necessary,
48  * and then transmits it on its medium.
49  *
50  * On input, each interface unwraps the data received by it, and either
51  * places it on the input queue of an internetwork datagram routine
52  * and posts the associated software interrupt, or passes the datagram to a raw
53  * packet input routine.
54  *
55  * Routines exist for locating interfaces by their addresses
56  * or for locating an interface on a certain network, as well as more general
57  * routing and gateway routines maintaining information used to locate
58  * interfaces.  These routines live in the files if.c and route.c
59  */
60 
61 struct	rtentry;		/* ifa_rtrequest */
62 struct	rt_addrinfo;		/* ifa_rtrequest */
63 struct	socket;
64 struct	carp_if;
65 struct	carp_softc;
66 struct  ifvlantrunk;
67 struct	route;			/* if_output */
68 struct	vnet;
69 
70 #ifdef _KERNEL
71 #include <sys/mbuf.h>		/* ifqueue only? */
72 #include <sys/buf_ring.h>
73 #include <net/vnet.h>
74 #endif /* _KERNEL */
75 #include <sys/counter.h>
76 #include <sys/lock.h>		/* XXX */
77 #include <sys/mutex.h>		/* struct ifqueue */
78 #include <sys/rwlock.h>		/* XXX */
79 #include <sys/sx.h>		/* XXX */
80 #include <sys/_task.h>		/* if_link_task */
81 
82 #define	IF_DUNIT_NONE	-1
83 
84 #include <altq/if_altq.h>
85 
86 TAILQ_HEAD(ifnethead, ifnet);	/* we use TAILQs so that the order of */
87 TAILQ_HEAD(ifaddrhead, ifaddr);	/* instantiation is preserved in the list */
88 TAILQ_HEAD(ifmultihead, ifmultiaddr);
89 TAILQ_HEAD(ifgrouphead, ifg_group);
90 
91 #ifdef _KERNEL
92 VNET_DECLARE(struct pfil_head, link_pfil_hook);	/* packet filter hooks */
93 #define	V_link_pfil_hook	VNET(link_pfil_hook)
94 #endif /* _KERNEL */
95 
96 /*
97  * Structure defining a network interface.
98  *
99  * Size ILP32:  592 (approx)
100  *	 LP64: 1048 (approx)
101  */
102 struct ifnet {
103 	/* General book keeping of interface lists. */
104 	TAILQ_ENTRY(ifnet) if_link; 	/* all struct ifnets are chained */
105 	LIST_ENTRY(ifnet) if_clones;	/* interfaces of a cloner */
106 	TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
107 					/* protected by if_addr_lock */
108 	u_char	if_alloctype;		/* if_type at time of allocation */
109 
110 	/* Driver and protocol specific information that remains stable. */
111 	void	*if_softc;		/* pointer to driver state */
112 	void	*if_llsoftc;		/* link layer softc */
113 	void	*if_l2com;		/* pointer to protocol bits */
114 	const char *if_dname;		/* driver name */
115 	int	if_dunit;		/* unit or IF_DUNIT_NONE */
116 	u_short	if_index;		/* numeric abbreviation for this if  */
117 	short	if_index_reserved;	/* spare space to grow if_index */
118 	char	if_xname[IFNAMSIZ];	/* external name (name + unit) */
119 	char	*if_description;	/* interface description */
120 
121 	/* Variable fields that are touched by the stack and drivers. */
122 	int	if_flags;		/* up/down, broadcast, etc. */
123 	int	if_capabilities;	/* interface features & capabilities */
124 	int	if_capenable;		/* enabled features & capabilities */
125 	void	*if_linkmib;		/* link-type-specific MIB data */
126 	size_t	if_linkmiblen;		/* length of above data */
127 	int	if_drv_flags;		/* driver-managed status flags */
128 	u_int	if_refcount;		/* reference count */
129 	struct  ifaltq if_snd;		/* output queue (includes altq) */
130 	struct	if_data if_data;	/* type information and statistics */
131 	struct	task if_linktask;	/* task for link change events */
132 
133 	/* Addresses of different protocol families assigned to this if. */
134 	struct	rwlock if_addr_lock;	/* lock to protect address lists */
135 		/*
136 		 * if_addrhead is the list of all addresses associated to
137 		 * an interface.
138 		 * Some code in the kernel assumes that first element
139 		 * of the list has type AF_LINK, and contains sockaddr_dl
140 		 * addresses which store the link-level address and the name
141 		 * of the interface.
142 		 * However, access to the AF_LINK address through this
143 		 * field is deprecated. Use if_addr or ifaddr_byindex() instead.
144 		 */
145 	struct	ifaddrhead if_addrhead;	/* linked list of addresses per if */
146 	struct	ifmultihead if_multiaddrs; /* multicast addresses configured */
147 	int	if_amcount;		/* number of all-multicast requests */
148 	struct	ifaddr	*if_addr;	/* pointer to link-level address */
149 	const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
150 	struct	rwlock if_afdata_lock;
151 	void	*if_afdata[AF_MAX];
152 	int	if_afdata_initialized;
153 
154 	/* Additional features hung off the interface. */
155 	u_int	if_fib;			/* interface FIB */
156 	struct	vnet *if_vnet;		/* pointer to network stack instance */
157 	struct	vnet *if_home_vnet;	/* where this ifnet originates from */
158 	struct  ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
159 	struct	bpf_if *if_bpf;		/* packet filter structure */
160 	int	if_pcount;		/* number of promiscuous listeners */
161 	void	*if_bridge;		/* bridge glue */
162 	void	*if_lagg;		/* lagg glue */
163 	void	*if_pf_kif;		/* pf glue */
164 	struct	carp_if *if_carp;	/* carp interface structure */
165 	struct	label *if_label;	/* interface MAC label */
166 
167 	/* Various procedures of the layer2 encapsulation and drivers. */
168 	int	(*if_output)		/* output routine (enqueue) */
169 		(struct ifnet *, struct mbuf *, const struct sockaddr *,
170 		     struct route *);
171 	void	(*if_input)		/* input routine (from h/w driver) */
172 		(struct ifnet *, struct mbuf *);
173 	void	(*if_start)		/* initiate output routine */
174 		(struct ifnet *);
175 	int	(*if_ioctl)		/* ioctl routine */
176 		(struct ifnet *, u_long, caddr_t);
177 	void	(*if_init)		/* Init routine */
178 		(void *);
179 	int	(*if_resolvemulti)	/* validate/resolve multicast */
180 		(struct ifnet *, struct sockaddr **, struct sockaddr *);
181 	void	(*if_qflush)		/* flush any queues */
182 		(struct ifnet *);
183 	int	(*if_transmit)		/* initiate output routine */
184 		(struct ifnet *, struct mbuf *);
185 	void	(*if_reassign)		/* reassign to vnet routine */
186 		(struct ifnet *, struct vnet *, char *);
187 
188 	/* Stuff that's only temporary and doesn't belong here. */
189 	u_int	if_hw_tsomax;		/* tso burst length limit, the minimum
190 					 * is (IP_MAXPACKET / 8).
191 					 * XXXAO: Have to find a better place
192 					 * for it eventually. */
193 	/*
194 	 * Spare fields are added so that we can modify sensitive data
195 	 * structures without changing the kernel binary interface, and must
196 	 * be used with care where binary compatibility is required.
197 	 */
198 	char	if_cspare[3];
199 	int	if_ispare[4];
200 	void	*if_unused[2];
201 	void	*if_pspare[8];		/* 1 netmap, 7 TDB */
202 };
203 
204 #include <net/ifq.h>	/* XXXAO: temporary unconditional include */
205 
206 /*
207  * XXX These aliases are terribly dangerous because they could apply
208  * to anything.
209  */
210 #define	if_mtu		if_data.ifi_mtu
211 #define	if_type		if_data.ifi_type
212 #define if_physical	if_data.ifi_physical
213 #define	if_addrlen	if_data.ifi_addrlen
214 #define	if_hdrlen	if_data.ifi_hdrlen
215 #define	if_metric	if_data.ifi_metric
216 #define	if_link_state	if_data.ifi_link_state
217 #define	if_baudrate	if_data.ifi_baudrate
218 #define	if_baudrate_pf	if_data.ifi_baudrate_pf
219 #define	if_hwassist	if_data.ifi_hwassist
220 #define	if_ipackets	if_data.ifi_ipackets
221 #define	if_ierrors	if_data.ifi_ierrors
222 #define	if_opackets	if_data.ifi_opackets
223 #define	if_oerrors	if_data.ifi_oerrors
224 #define	if_collisions	if_data.ifi_collisions
225 #define	if_ibytes	if_data.ifi_ibytes
226 #define	if_obytes	if_data.ifi_obytes
227 #define	if_imcasts	if_data.ifi_imcasts
228 #define	if_omcasts	if_data.ifi_omcasts
229 #define	if_iqdrops	if_data.ifi_iqdrops
230 #define	if_noproto	if_data.ifi_noproto
231 #define	if_lastchange	if_data.ifi_lastchange
232 
233 /* for compatibility with other BSDs */
234 #define	if_addrlist	if_addrhead
235 #define	if_list		if_link
236 #define	if_name(ifp)	((ifp)->if_xname)
237 
238 /*
239  * Locks for address lists on the network interface.
240  */
241 #define	IF_ADDR_LOCK_INIT(if)	rw_init(&(if)->if_addr_lock, "if_addr_lock")
242 #define	IF_ADDR_LOCK_DESTROY(if)	rw_destroy(&(if)->if_addr_lock)
243 #define	IF_ADDR_WLOCK(if)	rw_wlock(&(if)->if_addr_lock)
244 #define	IF_ADDR_WUNLOCK(if)	rw_wunlock(&(if)->if_addr_lock)
245 #define	IF_ADDR_RLOCK(if)	rw_rlock(&(if)->if_addr_lock)
246 #define	IF_ADDR_RUNLOCK(if)	rw_runlock(&(if)->if_addr_lock)
247 #define	IF_ADDR_LOCK_ASSERT(if)	rw_assert(&(if)->if_addr_lock, RA_LOCKED)
248 #define	IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED)
249 
250 /*
251  * Function variations on locking macros intended to be used by loadable
252  * kernel modules in order to divorce them from the internals of address list
253  * locking.
254  */
255 void	if_addr_rlock(struct ifnet *ifp);	/* if_addrhead */
256 void	if_addr_runlock(struct ifnet *ifp);	/* if_addrhead */
257 void	if_maddr_rlock(struct ifnet *ifp);	/* if_multiaddrs */
258 void	if_maddr_runlock(struct ifnet *ifp);	/* if_multiaddrs */
259 
260 #ifdef _KERNEL
261 #ifdef _SYS_EVENTHANDLER_H_
262 /* interface link layer address change event */
263 typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
264 EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
265 /* interface address change event */
266 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
267 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
268 /* new interface arrival event */
269 typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
270 EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
271 /* interface departure event */
272 typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
273 EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
274 /* Interface link state change event */
275 typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
276 EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
277 #endif /* _SYS_EVENTHANDLER_H_ */
278 
279 /*
280  * interface groups
281  */
282 struct ifg_group {
283 	char				 ifg_group[IFNAMSIZ];
284 	u_int				 ifg_refcnt;
285 	void				*ifg_pf_kif;
286 	TAILQ_HEAD(, ifg_member)	 ifg_members;
287 	TAILQ_ENTRY(ifg_group)		 ifg_next;
288 };
289 
290 struct ifg_member {
291 	TAILQ_ENTRY(ifg_member)	 ifgm_next;
292 	struct ifnet		*ifgm_ifp;
293 };
294 
295 struct ifg_list {
296 	struct ifg_group	*ifgl_group;
297 	TAILQ_ENTRY(ifg_list)	 ifgl_next;
298 };
299 
300 #ifdef _SYS_EVENTHANDLER_H_
301 /* group attach event */
302 typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
303 EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
304 /* group detach event */
305 typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
306 EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
307 /* group change event */
308 typedef void (*group_change_event_handler_t)(void *, const char *);
309 EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
310 #endif /* _SYS_EVENTHANDLER_H_ */
311 
312 #define	IF_AFDATA_LOCK_INIT(ifp)	\
313 	rw_init(&(ifp)->if_afdata_lock, "if_afdata")
314 
315 #define	IF_AFDATA_WLOCK(ifp)	rw_wlock(&(ifp)->if_afdata_lock)
316 #define	IF_AFDATA_RLOCK(ifp)	rw_rlock(&(ifp)->if_afdata_lock)
317 #define	IF_AFDATA_WUNLOCK(ifp)	rw_wunlock(&(ifp)->if_afdata_lock)
318 #define	IF_AFDATA_RUNLOCK(ifp)	rw_runlock(&(ifp)->if_afdata_lock)
319 #define	IF_AFDATA_LOCK(ifp)	IF_AFDATA_WLOCK(ifp)
320 #define	IF_AFDATA_UNLOCK(ifp)	IF_AFDATA_WUNLOCK(ifp)
321 #define	IF_AFDATA_TRYLOCK(ifp)	rw_try_wlock(&(ifp)->if_afdata_lock)
322 #define	IF_AFDATA_DESTROY(ifp)	rw_destroy(&(ifp)->if_afdata_lock)
323 
324 #define	IF_AFDATA_LOCK_ASSERT(ifp)	rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED)
325 #define	IF_AFDATA_RLOCK_ASSERT(ifp)	rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED)
326 #define	IF_AFDATA_WLOCK_ASSERT(ifp)	rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED)
327 #define	IF_AFDATA_UNLOCK_ASSERT(ifp)	rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED)
328 
329 static __inline void
330 if_initbaudrate(struct ifnet *ifp, uintmax_t baud)
331 {
332 
333 	ifp->if_baudrate_pf = 0;
334 	while (baud > (u_long)(~0UL)) {
335 		baud /= 10;
336 		ifp->if_baudrate_pf++;
337 	}
338 	ifp->if_baudrate = baud;
339 }
340 
341 /*
342  * 72 was chosen below because it is the size of a TCP/IP
343  * header (40) + the minimum mss (32).
344  */
345 #define	IF_MINMTU	72
346 #define	IF_MAXMTU	65535
347 
348 #define	TOEDEV(ifp)	((ifp)->if_llsoftc)
349 
350 #endif /* _KERNEL */
351 
352 /*
353  * The ifaddr structure contains information about one address
354  * of an interface.  They are maintained by the different address families,
355  * are allocated and attached when an address is set, and are linked
356  * together so all addresses for an interface can be located.
357  *
358  * NOTE: a 'struct ifaddr' is always at the beginning of a larger
359  * chunk of malloc'ed memory, where we store the three addresses
360  * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
361  */
362 #if defined(_KERNEL) || defined(_WANT_IFADDR)
363 struct ifaddr {
364 	struct	sockaddr *ifa_addr;	/* address of interface */
365 	struct	sockaddr *ifa_dstaddr;	/* other end of p-to-p link */
366 #define	ifa_broadaddr	ifa_dstaddr	/* broadcast address interface */
367 	struct	sockaddr *ifa_netmask;	/* used to determine subnet */
368 	struct	ifnet *ifa_ifp;		/* back-pointer to interface */
369 	struct	carp_softc *ifa_carp;	/* pointer to CARP data */
370 	TAILQ_ENTRY(ifaddr) ifa_link;	/* queue macro glue */
371 	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */
372 		(int, struct rtentry *, struct rt_addrinfo *);
373 	u_short	ifa_flags;		/* mostly rt_flags for cloning */
374 	u_int	ifa_refcnt;		/* references to this structure */
375 	int	ifa_metric;		/* cost of going out this interface */
376 	int (*ifa_claim_addr)		/* check if an addr goes to this if */
377 		(struct ifaddr *, struct sockaddr *);
378 
379 	counter_u64_t	ifa_ipackets;
380 	counter_u64_t	ifa_opackets;
381 	counter_u64_t	ifa_ibytes;
382 	counter_u64_t	ifa_obytes;
383 };
384 #endif
385 
386 #ifdef _KERNEL
387 #define	IFA_ROUTE	RTF_UP		/* route installed */
388 #define	IFA_RTSELF	RTF_HOST	/* loopback route to self installed */
389 
390 /* For compatibility with other BSDs. SCTP uses it. */
391 #define	ifa_list	ifa_link
392 
393 struct ifaddr *	ifa_alloc(size_t size, int flags);
394 void	ifa_free(struct ifaddr *ifa);
395 void	ifa_ref(struct ifaddr *ifa);
396 #endif /* _KERNEL */
397 
398 /*
399  * Multicast address structure.  This is analogous to the ifaddr
400  * structure except that it keeps track of multicast addresses.
401  */
402 struct ifmultiaddr {
403 	TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
404 	struct	sockaddr *ifma_addr; 	/* address this membership is for */
405 	struct	sockaddr *ifma_lladdr;	/* link-layer translation, if any */
406 	struct	ifnet *ifma_ifp;	/* back-pointer to interface */
407 	u_int	ifma_refcount;		/* reference count */
408 	void	*ifma_protospec;	/* protocol-specific state, if any */
409 	struct	ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
410 };
411 
412 #ifdef _KERNEL
413 
414 extern	struct rwlock ifnet_rwlock;
415 extern	struct sx ifnet_sxlock;
416 
417 #define	IFNET_LOCK_INIT() do {						\
418 	rw_init_flags(&ifnet_rwlock, "ifnet_rw",  RW_RECURSE);		\
419 	sx_init_flags(&ifnet_sxlock, "ifnet_sx",  SX_RECURSE);		\
420 } while(0)
421 
422 #define	IFNET_WLOCK() do {						\
423 	sx_xlock(&ifnet_sxlock);					\
424 	rw_wlock(&ifnet_rwlock);					\
425 } while (0)
426 
427 #define	IFNET_WUNLOCK() do {						\
428 	rw_wunlock(&ifnet_rwlock);					\
429 	sx_xunlock(&ifnet_sxlock);					\
430 } while (0)
431 
432 /*
433  * To assert the ifnet lock, you must know not only whether it's for read or
434  * write, but also whether it was acquired with sleep support or not.
435  */
436 #define	IFNET_RLOCK_ASSERT()		sx_assert(&ifnet_sxlock, SA_SLOCKED)
437 #define	IFNET_RLOCK_NOSLEEP_ASSERT()	rw_assert(&ifnet_rwlock, RA_RLOCKED)
438 #define	IFNET_WLOCK_ASSERT() do {					\
439 	sx_assert(&ifnet_sxlock, SA_XLOCKED);				\
440 	rw_assert(&ifnet_rwlock, RA_WLOCKED);				\
441 } while (0)
442 
443 #define	IFNET_RLOCK()		sx_slock(&ifnet_sxlock)
444 #define	IFNET_RLOCK_NOSLEEP()	rw_rlock(&ifnet_rwlock)
445 #define	IFNET_RUNLOCK()		sx_sunlock(&ifnet_sxlock)
446 #define	IFNET_RUNLOCK_NOSLEEP()	rw_runlock(&ifnet_rwlock)
447 
448 /*
449  * Look up an ifnet given its index; the _ref variant also acquires a
450  * reference that must be freed using if_rele().  It is almost always a bug
451  * to call ifnet_byindex() instead if ifnet_byindex_ref().
452  */
453 struct ifnet	*ifnet_byindex(u_short idx);
454 struct ifnet	*ifnet_byindex_locked(u_short idx);
455 struct ifnet	*ifnet_byindex_ref(u_short idx);
456 
457 /*
458  * Given the index, ifaddr_byindex() returns the one and only
459  * link-level ifaddr for the interface. You are not supposed to use
460  * it to traverse the list of addresses associated to the interface.
461  */
462 struct ifaddr	*ifaddr_byindex(u_short idx);
463 
464 VNET_DECLARE(struct ifnethead, ifnet);
465 VNET_DECLARE(struct ifgrouphead, ifg_head);
466 VNET_DECLARE(int, if_index);
467 VNET_DECLARE(struct ifnet *, loif);	/* first loopback interface */
468 
469 #define	V_ifnet		VNET(ifnet)
470 #define	V_ifg_head	VNET(ifg_head)
471 #define	V_if_index	VNET(if_index)
472 #define	V_loif		VNET(loif)
473 
474 int	if_addgroup(struct ifnet *, const char *);
475 int	if_delgroup(struct ifnet *, const char *);
476 int	if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
477 int	if_allmulti(struct ifnet *, int);
478 struct	ifnet* if_alloc(u_char);
479 void	if_attach(struct ifnet *);
480 void	if_dead(struct ifnet *);
481 int	if_delmulti(struct ifnet *, struct sockaddr *);
482 void	if_delmulti_ifma(struct ifmultiaddr *);
483 void	if_detach(struct ifnet *);
484 void	if_vmove(struct ifnet *, struct vnet *);
485 void	if_purgeaddrs(struct ifnet *);
486 void	if_delallmulti(struct ifnet *);
487 void	if_down(struct ifnet *);
488 struct ifmultiaddr *
489 	if_findmulti(struct ifnet *, struct sockaddr *);
490 void	if_free(struct ifnet *);
491 void	if_initname(struct ifnet *, const char *, int);
492 void	if_link_state_change(struct ifnet *, int);
493 int	if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
494 void	if_ref(struct ifnet *);
495 void	if_rele(struct ifnet *);
496 int	if_setlladdr(struct ifnet *, const u_char *, int);
497 void	if_up(struct ifnet *);
498 int	ifioctl(struct socket *, u_long, caddr_t, struct thread *);
499 int	ifpromisc(struct ifnet *, int);
500 struct	ifnet *ifunit(const char *);
501 struct	ifnet *ifunit_ref(const char *);
502 
503 int	ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
504 int	ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
505 int	ifa_switch_loopback_route(struct ifaddr *, struct sockaddr *);
506 
507 struct	ifaddr *ifa_ifwithaddr(struct sockaddr *);
508 int		ifa_ifwithaddr_check(struct sockaddr *);
509 struct	ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
510 struct	ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
511 struct	ifaddr *ifa_ifwithnet(struct sockaddr *, int);
512 struct	ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
513 struct	ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
514 struct	ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
515 int	ifa_preferred(struct ifaddr *, struct ifaddr *);
516 
517 int	if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
518 
519 typedef	void *if_com_alloc_t(u_char type, struct ifnet *ifp);
520 typedef	void if_com_free_t(void *com, u_char type);
521 void	if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
522 void	if_deregister_com_alloc(u_char type);
523 
524 #define IF_LLADDR(ifp)							\
525     LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
526 
527 #endif /* _KERNEL */
528 #endif /* !_NET_IF_VAR_H_ */
529