2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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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 1.30 2005/06/15 19:29:30 joerg 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;
108 #ifdef DEVICE_POLLING
109 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
114 * Structure defining a network interface.
116 * (Would like to call this struct ``if'', but C isn't PL/1.)
120 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
121 * one of these structures, typically held within an arpcom structure.
123 * struct <foo>_softc {
125 * struct ifnet ac_if;
131 * The assumption is used in a number of places, including many
132 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
134 * Unfortunately devices' softc are opaque, so we depend on this layout
135 * to locate the struct ifnet from the softc in the generic code.
137 * Note that not all fields are used by drivers in the FreeBSD source
138 * tree. However, who knows what third party software does with fields
139 * marked as "unused", such as if_ipending, if_done, and if_poll*,
140 * so any attemt to redefine their meaning might end up in binary
141 * compatibility problems, even if the size of struct ifnet, and
142 * the size and position of its fields do not change.
143 * We just have to live with that.
146 void *if_softc; /* pointer to driver state */
147 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
148 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
149 const char *if_dname; /* driver name */
150 int if_dunit; /* unit or IF_DUNIT_NONE */
151 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
152 int if_pcount; /* number of promiscuous listeners */
153 struct bpf_if *if_bpf; /* packet filter structure */
154 u_short if_index; /* numeric abbreviation for this if */
155 short if_timer; /* time 'til if_watchdog called */
156 int if_flags; /* up/down, broadcast, etc. */
157 int if_capabilities; /* interface capabilities */
158 int if_capenable; /* enabled features */
159 void *if_linkmib; /* link-type-specific MIB data */
160 size_t if_linkmiblen; /* length of above data */
161 struct if_data if_data;
162 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
163 int if_amcount; /* number of all-multicast requests */
164 /* procedure handles */
165 int (*if_output) /* output routine (enqueue) */
166 (struct ifnet *, struct mbuf *, struct sockaddr *,
168 void (*if_input) /* input routine from hardware driver */
169 (struct ifnet *, struct mbuf *);
170 void (*if_start) /* initiate output routine */
172 int (*if_ioctl) /* ioctl routine */
173 (struct ifnet *, u_long, caddr_t, struct ucred *);
174 void (*if_watchdog) /* timer routine */
176 void (*if_init) /* Init routine */
178 int (*if_resolvemulti) /* validate/resolve multicast */
179 (struct ifnet *, struct sockaddr **, struct sockaddr *);
180 #ifdef DEVICE_POLLING
181 void (*if_poll) /* IFF_POLLING support */
182 (struct ifnet *, enum poll_cmd, int);
184 void (*if_poll_unused)(void); /* placeholder */
186 struct ifaltq if_snd; /* output queue (includes altq) */
187 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
188 const uint8_t *if_broadcastaddr;
189 void *if_afdata[AF_MAX];
190 struct ifaddr *if_lladdr;
192 typedef void if_init_f_t (void *);
194 #define if_mtu if_data.ifi_mtu
195 #define if_type if_data.ifi_type
196 #define if_physical if_data.ifi_physical
197 #define if_addrlen if_data.ifi_addrlen
198 #define if_hdrlen if_data.ifi_hdrlen
199 #define if_metric if_data.ifi_metric
200 #define if_baudrate if_data.ifi_baudrate
201 #define if_hwassist if_data.ifi_hwassist
202 #define if_ipackets if_data.ifi_ipackets
203 #define if_ierrors if_data.ifi_ierrors
204 #define if_opackets if_data.ifi_opackets
205 #define if_oerrors if_data.ifi_oerrors
206 #define if_collisions if_data.ifi_collisions
207 #define if_ibytes if_data.ifi_ibytes
208 #define if_obytes if_data.ifi_obytes
209 #define if_imcasts if_data.ifi_imcasts
210 #define if_omcasts if_data.ifi_omcasts
211 #define if_iqdrops if_data.ifi_iqdrops
212 #define if_noproto if_data.ifi_noproto
213 #define if_lastchange if_data.ifi_lastchange
214 #define if_recvquota if_data.ifi_recvquota
215 #define if_xmitquota if_data.ifi_xmitquota
216 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
218 /* for compatibility with other BSDs */
219 #define if_addrlist if_addrhead
220 #define if_list if_link
223 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
224 * are queues of messages stored on ifqueue structures
225 * (defined above). Entries are added to and deleted from these structures
226 * by these macros, which should be called with ipl raised to splimp().
228 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
229 #define IF_DROP(ifq) ((ifq)->ifq_drops++)
230 #define IF_QLEN(ifq) ((ifq)->ifq_len)
231 #define IF_QEMPTY(ifq) (IF_QLEN(ifq) == 0)
232 #define IF_ENQUEUE(ifq, m) { \
233 (m)->m_nextpkt = 0; \
234 if ((ifq)->ifq_tail == 0) \
235 (ifq)->ifq_head = m; \
237 (ifq)->ifq_tail->m_nextpkt = m; \
238 (ifq)->ifq_tail = m; \
241 #define IF_PREPEND(ifq, m) { \
242 (m)->m_nextpkt = (ifq)->ifq_head; \
243 if ((ifq)->ifq_tail == 0) \
244 (ifq)->ifq_tail = (m); \
245 (ifq)->ifq_head = (m); \
248 #define IF_DEQUEUE(ifq, m) { \
249 (m) = (ifq)->ifq_head; \
251 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
252 (ifq)->ifq_tail = 0; \
253 (m)->m_nextpkt = 0; \
258 #define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
260 #define IF_DRAIN(ifq) do { \
263 IF_DEQUEUE(ifq, m); \
272 #define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
273 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
276 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
279 int _need_if_start = 0;
283 if (IF_QFULL(_ifq)) {
290 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
291 if (_m->m_flags & M_MCAST)
293 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
295 IF_ENQUEUE(_ifq, _m);
297 (*_ifp->if_start)(_ifp);
303 * 72 was chosen below because it is the size of a TCP/IP
304 * header (40) + the minimum mss (32).
307 #define IF_MAXMTU 65535
312 * The ifaddr structure contains information about one address
313 * of an interface. They are maintained by the different address families,
314 * are allocated and attached when an address is set, and are linked
315 * together so all addresses for an interface can be located.
318 struct sockaddr *ifa_addr; /* address of interface */
319 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
320 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
321 struct sockaddr *ifa_netmask; /* used to determine subnet */
322 struct if_data if_data; /* not all members are meaningful */
323 struct ifnet *ifa_ifp; /* back-pointer to interface */
324 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
325 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
326 (int, struct rtentry *, struct rt_addrinfo *);
327 u_short ifa_flags; /* mostly rt_flags for cloning */
328 u_int ifa_refcnt; /* references to this structure */
329 int ifa_metric; /* cost of going out this interface */
331 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
333 int (*ifa_claim_addr) /* check if an addr goes to this if */
334 (struct ifaddr *, struct sockaddr *);
337 #define IFA_ROUTE RTF_UP /* route installed */
339 /* for compatibility with other BSDs */
340 #define ifa_list ifa_link
343 * The prefix structure contains information about one prefix
344 * of an interface. They are maintained by the different address families,
345 * are allocated and attached when an prefix or an address is set,
346 * and are linked together so all prefixes for an interface can be located.
349 struct sockaddr *ifpr_prefix; /* prefix of interface */
350 struct ifnet *ifpr_ifp; /* back-pointer to interface */
351 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
352 u_char ifpr_plen; /* prefix length in bits */
353 u_char ifpr_type; /* protocol dependent prefix type */
357 * Multicast address structure. This is analogous to the ifaddr
358 * structure except that it keeps track of multicast addresses.
359 * Also, the reference count here is a count of requests for this
360 * address, not a count of pointers to this structure.
363 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
364 struct sockaddr *ifma_addr; /* address this membership is for */
365 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
366 struct ifnet *ifma_ifp; /* back-pointer to interface */
367 u_int ifma_refcount; /* reference count */
368 void *ifma_protospec; /* protocol-specific state, if any */
372 /* interface address change event */
373 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
374 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
375 /* new interface attach event */
376 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
377 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
378 /* interface detach event */
379 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
380 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
381 /* interface clone event */
382 typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
383 EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
386 IFAREF(struct ifaddr *_ifa)
391 #include <sys/malloc.h>
393 MALLOC_DECLARE(M_IFADDR);
394 MALLOC_DECLARE(M_IFMADDR);
397 IFAFREE(struct ifaddr *_ifa)
399 if (_ifa->ifa_refcnt <= 0)
400 free(_ifa, M_IFADDR);
405 extern struct ifnethead ifnet;
406 extern struct ifnet **ifindex2ifnet;
407 extern int ifqmaxlen;
408 extern struct ifnet loif[];
411 void ether_ifattach(struct ifnet *, uint8_t *);
412 void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int);
413 void ether_ifdetach(struct ifnet *);
414 void ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
415 void ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
416 int ether_output_frame(struct ifnet *, struct mbuf *);
417 int ether_ioctl(struct ifnet *, int, caddr_t);
418 uint32_t ether_crc32_le(const uint8_t *, size_t);
419 uint32_t ether_crc32_be(const uint8_t *, size_t);
421 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
422 int if_allmulti(struct ifnet *, int);
423 void if_attach(struct ifnet *);
424 int if_delmulti(struct ifnet *, struct sockaddr *);
425 void if_detach(struct ifnet *);
426 void if_down(struct ifnet *);
427 void if_initname(struct ifnet *, const char *, int);
428 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
429 void if_route(struct ifnet *, int flag, int fam);
430 int if_setlladdr(struct ifnet *, const u_char *, int);
431 void if_unroute(struct ifnet *, int flag, int fam);
432 void if_up(struct ifnet *);
433 /*void ifinit(void);*/ /* declared in systm.h for main() */
434 int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
435 int ifpromisc(struct ifnet *, int);
436 struct ifnet *ifunit(const char *);
437 struct ifnet *if_withname(struct sockaddr *);
439 struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
440 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
441 struct ifaddr *ifa_ifwithnet(struct sockaddr *);
442 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
443 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
445 struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
446 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
448 void if_clone_attach(struct if_clone *);
449 void if_clone_detach(struct if_clone *);
451 int if_clone_create(char *, int);
452 int if_clone_destroy(const char *);
454 #define IF_LLSOCKADDR(ifp) \
455 ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
456 #define IF_LLADDR(ifp) LLADDR(IF_LLSOCKADDR(ifp))
458 #ifdef DEVICE_POLLING
459 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
460 int ether_poll_register(struct ifnet *);
461 int ether_poll_deregister(struct ifnet *);
462 void emergency_poll_enable(const char *);
463 #endif /* DEVICE_POLLING */
466 #endif /* !_NET_IF_VAR_H_ */