2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * From: @(#)if.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
35 * $DragonFly: src/sys/net/if_var.h,v 1.31 2005/10/24 08:06:16 sephe Exp $
38 #ifndef _NET_IF_VAR_H_
39 #define _NET_IF_VAR_H_
42 * Structures defining a network interface, providing a packet
43 * transport mechanism (ala level 0 of the PUP protocols).
45 * Each interface accepts output datagrams of a specified maximum
46 * length, and provides higher level routines with input datagrams
47 * received from its medium.
49 * Output occurs when the routine if_output is called, with three parameters:
50 * (*ifp->if_output)(ifp, m, dst, rt)
51 * Here m is the mbuf chain to be sent and dst is the destination address.
52 * The output routine encapsulates the supplied datagram if necessary,
53 * and then transmits it on its medium.
55 * On input, each interface unwraps the data received by it, and either
56 * places it on the input queue of a internetwork datagram routine
57 * and posts the associated software interrupt, or passes the datagram to
58 * the routine if_input. It is called with the mbuf chain as parameter:
59 * (*ifp->if_input)(ifp, m)
60 * The input routine removes the protocol dependent header if necessary.
62 * Routines exist for locating interfaces by their addresses
63 * or for locating a interface on a certain network, as well as more general
64 * routing and gateway routines maintaining information used to locate
65 * interfaces. These routines live in the files if.c and route.c
69 * Forward structure declarations for function prototypes [sic].
79 #include <sys/queue.h> /* get TAILQ macros */
81 #include <net/altq/if_altq.h>
84 #include <sys/eventhandler.h>
86 #include <sys/systm.h> /* XXX */
87 #include <sys/thread2.h>
90 #define IF_DUNIT_NONE -1
92 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
93 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
94 TAILQ_HEAD(ifprefixhead, ifprefix);
95 LIST_HEAD(ifmultihead, ifmultiaddr);
98 * Structure defining a queue for a network interface.
101 struct mbuf *ifq_head;
102 struct mbuf *ifq_tail;
109 * Note of DEVICE_POLLING
110 * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
111 * file should include opt_polling.h at its beginning.
112 * 2) When struct changes, which are conditioned by DEVICE_POLLING,
113 * are to be introduced, please keep the struct's size and layout
114 * same, no matter whether DEVICE_POLLING is defined or not.
115 * See ifnet.if_poll and ifnet.if_poll_unused for example.
118 #ifdef DEVICE_POLLING
119 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
124 * Structure defining a network interface.
126 * (Would like to call this struct ``if'', but C isn't PL/1.)
130 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
131 * one of these structures, typically held within an arpcom structure.
133 * struct <foo>_softc {
135 * struct ifnet ac_if;
141 * The assumption is used in a number of places, including many
142 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
144 * Unfortunately devices' softc are opaque, so we depend on this layout
145 * to locate the struct ifnet from the softc in the generic code.
147 * Note that not all fields are used by drivers in the FreeBSD source
148 * tree. However, who knows what third party software does with fields
149 * marked as "unused", such as if_ipending, if_done, and if_poll*,
150 * so any attemt to redefine their meaning might end up in binary
151 * compatibility problems, even if the size of struct ifnet, and
152 * the size and position of its fields do not change.
153 * We just have to live with that.
156 void *if_softc; /* pointer to driver state */
157 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
158 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
159 const char *if_dname; /* driver name */
160 int if_dunit; /* unit or IF_DUNIT_NONE */
161 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
162 int if_pcount; /* number of promiscuous listeners */
163 struct bpf_if *if_bpf; /* packet filter structure */
164 u_short if_index; /* numeric abbreviation for this if */
165 short if_timer; /* time 'til if_watchdog called */
166 int if_flags; /* up/down, broadcast, etc. */
167 int if_capabilities; /* interface capabilities */
168 int if_capenable; /* enabled features */
169 void *if_linkmib; /* link-type-specific MIB data */
170 size_t if_linkmiblen; /* length of above data */
171 struct if_data if_data;
172 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
173 int if_amcount; /* number of all-multicast requests */
174 /* procedure handles */
175 int (*if_output) /* output routine (enqueue) */
176 (struct ifnet *, struct mbuf *, struct sockaddr *,
178 void (*if_input) /* input routine from hardware driver */
179 (struct ifnet *, struct mbuf *);
180 void (*if_start) /* initiate output routine */
182 int (*if_ioctl) /* ioctl routine */
183 (struct ifnet *, u_long, caddr_t, struct ucred *);
184 void (*if_watchdog) /* timer routine */
186 void (*if_init) /* Init routine */
188 int (*if_resolvemulti) /* validate/resolve multicast */
189 (struct ifnet *, struct sockaddr **, struct sockaddr *);
190 #ifdef DEVICE_POLLING
191 void (*if_poll) /* IFF_POLLING support */
192 (struct ifnet *, enum poll_cmd, int);
194 void (*if_poll_unused)(void); /* placeholder */
196 struct ifaltq if_snd; /* output queue (includes altq) */
197 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
198 const uint8_t *if_broadcastaddr;
199 void *if_afdata[AF_MAX];
200 struct ifaddr *if_lladdr;
202 typedef void if_init_f_t (void *);
204 #define if_mtu if_data.ifi_mtu
205 #define if_type if_data.ifi_type
206 #define if_physical if_data.ifi_physical
207 #define if_addrlen if_data.ifi_addrlen
208 #define if_hdrlen if_data.ifi_hdrlen
209 #define if_metric if_data.ifi_metric
210 #define if_baudrate if_data.ifi_baudrate
211 #define if_hwassist if_data.ifi_hwassist
212 #define if_ipackets if_data.ifi_ipackets
213 #define if_ierrors if_data.ifi_ierrors
214 #define if_opackets if_data.ifi_opackets
215 #define if_oerrors if_data.ifi_oerrors
216 #define if_collisions if_data.ifi_collisions
217 #define if_ibytes if_data.ifi_ibytes
218 #define if_obytes if_data.ifi_obytes
219 #define if_imcasts if_data.ifi_imcasts
220 #define if_omcasts if_data.ifi_omcasts
221 #define if_iqdrops if_data.ifi_iqdrops
222 #define if_noproto if_data.ifi_noproto
223 #define if_lastchange if_data.ifi_lastchange
224 #define if_recvquota if_data.ifi_recvquota
225 #define if_xmitquota if_data.ifi_xmitquota
226 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
228 /* for compatibility with other BSDs */
229 #define if_addrlist if_addrhead
230 #define if_list if_link
233 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
234 * are queues of messages stored on ifqueue structures
235 * (defined above). Entries are added to and deleted from these structures
236 * by these macros, which should be called with ipl raised to splimp().
238 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
239 #define IF_DROP(ifq) ((ifq)->ifq_drops++)
240 #define IF_QLEN(ifq) ((ifq)->ifq_len)
241 #define IF_QEMPTY(ifq) (IF_QLEN(ifq) == 0)
242 #define IF_ENQUEUE(ifq, m) { \
243 (m)->m_nextpkt = 0; \
244 if ((ifq)->ifq_tail == 0) \
245 (ifq)->ifq_head = m; \
247 (ifq)->ifq_tail->m_nextpkt = m; \
248 (ifq)->ifq_tail = m; \
251 #define IF_PREPEND(ifq, m) { \
252 (m)->m_nextpkt = (ifq)->ifq_head; \
253 if ((ifq)->ifq_tail == 0) \
254 (ifq)->ifq_tail = (m); \
255 (ifq)->ifq_head = (m); \
258 #define IF_DEQUEUE(ifq, m) { \
259 (m) = (ifq)->ifq_head; \
261 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
262 (ifq)->ifq_tail = 0; \
263 (m)->m_nextpkt = 0; \
268 #define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
270 #define IF_DRAIN(ifq) do { \
273 IF_DEQUEUE(ifq, m); \
282 #define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
283 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
286 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
289 int _need_if_start = 0;
293 if (IF_QFULL(_ifq)) {
300 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
301 if (_m->m_flags & M_MCAST)
303 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
305 IF_ENQUEUE(_ifq, _m);
307 (*_ifp->if_start)(_ifp);
313 * 72 was chosen below because it is the size of a TCP/IP
314 * header (40) + the minimum mss (32).
317 #define IF_MAXMTU 65535
322 * The ifaddr structure contains information about one address
323 * of an interface. They are maintained by the different address families,
324 * are allocated and attached when an address is set, and are linked
325 * together so all addresses for an interface can be located.
328 struct sockaddr *ifa_addr; /* address of interface */
329 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
330 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
331 struct sockaddr *ifa_netmask; /* used to determine subnet */
332 struct if_data if_data; /* not all members are meaningful */
333 struct ifnet *ifa_ifp; /* back-pointer to interface */
334 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
335 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
336 (int, struct rtentry *, struct rt_addrinfo *);
337 u_short ifa_flags; /* mostly rt_flags for cloning */
338 u_int ifa_refcnt; /* references to this structure */
339 int ifa_metric; /* cost of going out this interface */
341 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
343 int (*ifa_claim_addr) /* check if an addr goes to this if */
344 (struct ifaddr *, struct sockaddr *);
347 #define IFA_ROUTE RTF_UP /* route installed */
349 /* for compatibility with other BSDs */
350 #define ifa_list ifa_link
353 * The prefix structure contains information about one prefix
354 * of an interface. They are maintained by the different address families,
355 * are allocated and attached when an prefix or an address is set,
356 * and are linked together so all prefixes for an interface can be located.
359 struct sockaddr *ifpr_prefix; /* prefix of interface */
360 struct ifnet *ifpr_ifp; /* back-pointer to interface */
361 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
362 u_char ifpr_plen; /* prefix length in bits */
363 u_char ifpr_type; /* protocol dependent prefix type */
367 * Multicast address structure. This is analogous to the ifaddr
368 * structure except that it keeps track of multicast addresses.
369 * Also, the reference count here is a count of requests for this
370 * address, not a count of pointers to this structure.
373 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
374 struct sockaddr *ifma_addr; /* address this membership is for */
375 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
376 struct ifnet *ifma_ifp; /* back-pointer to interface */
377 u_int ifma_refcount; /* reference count */
378 void *ifma_protospec; /* protocol-specific state, if any */
382 /* interface address change event */
383 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
384 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
385 /* new interface attach event */
386 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
387 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
388 /* interface detach event */
389 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
390 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
391 /* interface clone event */
392 typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
393 EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
396 IFAREF(struct ifaddr *_ifa)
401 #include <sys/malloc.h>
403 MALLOC_DECLARE(M_IFADDR);
404 MALLOC_DECLARE(M_IFMADDR);
407 IFAFREE(struct ifaddr *_ifa)
409 if (_ifa->ifa_refcnt <= 0)
410 free(_ifa, M_IFADDR);
415 extern struct ifnethead ifnet;
416 extern struct ifnet **ifindex2ifnet;
417 extern int ifqmaxlen;
418 extern struct ifnet loif[];
421 void ether_ifattach(struct ifnet *, uint8_t *);
422 void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int);
423 void ether_ifdetach(struct ifnet *);
424 void ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
425 void ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
426 int ether_output_frame(struct ifnet *, struct mbuf *);
427 int ether_ioctl(struct ifnet *, int, caddr_t);
428 uint32_t ether_crc32_le(const uint8_t *, size_t);
429 uint32_t ether_crc32_be(const uint8_t *, size_t);
431 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
432 int if_allmulti(struct ifnet *, int);
433 void if_attach(struct ifnet *);
434 int if_delmulti(struct ifnet *, struct sockaddr *);
435 void if_detach(struct ifnet *);
436 void if_down(struct ifnet *);
437 void if_initname(struct ifnet *, const char *, int);
438 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
439 void if_route(struct ifnet *, int flag, int fam);
440 int if_setlladdr(struct ifnet *, const u_char *, int);
441 void if_unroute(struct ifnet *, int flag, int fam);
442 void if_up(struct ifnet *);
443 /*void ifinit(void);*/ /* declared in systm.h for main() */
444 int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
445 int ifpromisc(struct ifnet *, int);
446 struct ifnet *ifunit(const char *);
447 struct ifnet *if_withname(struct sockaddr *);
449 struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
450 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
451 struct ifaddr *ifa_ifwithnet(struct sockaddr *);
452 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
453 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
455 struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
456 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
458 void if_clone_attach(struct if_clone *);
459 void if_clone_detach(struct if_clone *);
461 int if_clone_create(char *, int);
462 int if_clone_destroy(const char *);
464 #define IF_LLSOCKADDR(ifp) \
465 ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
466 #define IF_LLADDR(ifp) LLADDR(IF_LLSOCKADDR(ifp))
468 #ifdef DEVICE_POLLING
469 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
470 int ether_poll_register(struct ifnet *);
471 int ether_poll_deregister(struct ifnet *);
472 void emergency_poll_enable(const char *);
473 #endif /* DEVICE_POLLING */
476 #endif /* !_NET_IF_VAR_H_ */