2 * Copyright (c) 1982, 1986, 1989, 1993
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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 1.11 2004/04/16 14:24:36 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 a raw
58 * packet input routine.
60 * Routines exist for locating interfaces by their addresses
61 * or for locating a interface on a certain network, as well as more general
62 * routing and gateway routines maintaining information used to locate
63 * interfaces. These routines live in the files if.c and route.c
68 * Forward structure declarations for function prototypes [sic].
79 #include <sys/queue.h> /* get TAILQ macros */
83 #include <sys/systm.h> /* XXX */
86 #define IF_DUNIT_NONE -1
88 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
89 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
90 TAILQ_HEAD(ifprefixhead, ifprefix);
91 LIST_HEAD(ifmultihead, ifmultiaddr);
94 * Structure defining a queue for a network interface.
97 struct mbuf *ifq_head;
98 struct mbuf *ifq_tail;
105 * Structure defining a network interface.
107 * (Would like to call this struct ``if'', but C isn't PL/1.)
111 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
112 * one of these structures, typically held within an arpcom structure.
114 * struct <foo>_softc {
116 * struct ifnet ac_if;
122 * The assumption is used in a number of places, including many
123 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
125 * Unfortunately devices' softc are opaque, so we depend on this layout
126 * to locate the struct ifnet from the softc in the generic code.
128 * Note that not all fields are used by drivers in the FreeBSD source
129 * tree. However, who knows what third party software does with fields
130 * marked as "unused", such as if_ipending, if_done, and if_poll*,
131 * so any attemt to redefine their meaning might end up in binary
132 * compatibility problems, even if the size of struct ifnet, and
133 * the size and position of its fields do not change.
134 * We just have to live with that.
137 void *if_softc; /* pointer to driver state */
138 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
139 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
140 const char *if_dname; /* driver name */
141 int if_dunit; /* unit or IF_DUNIT_NONE */
142 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
143 int if_pcount; /* number of promiscuous listeners */
144 struct bpf_if *if_bpf; /* packet filter structure */
145 u_short if_index; /* numeric abbreviation for this if */
146 short if_timer; /* time 'til if_watchdog called */
147 int if_flags; /* up/down, broadcast, etc. */
148 int if_capabilities; /* interface capabilities */
149 int if_capenable; /* enabled features */
150 void *if_linkmib; /* link-type-specific MIB data */
151 size_t if_linkmiblen; /* length of above data */
152 struct if_data if_data;
153 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
154 int if_amcount; /* number of all-multicast requests */
155 /* procedure handles */
156 int (*if_output) /* output routine (enqueue) */
157 (struct ifnet *, struct mbuf *, struct sockaddr *,
159 void (*if_start) /* initiate output routine */
161 int (*if_ioctl) /* ioctl routine */
162 (struct ifnet *, u_long, caddr_t, struct ucred *);
163 void (*if_watchdog) /* timer routine */
165 void (*if_init) /* Init routine */
167 int (*if_resolvemulti) /* validate/resolve multicast */
168 (struct ifnet *, struct sockaddr **, struct sockaddr *);
169 struct ifqueue if_snd; /* output queue */
170 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
172 typedef void if_init_f_t (void *);
174 #define if_mtu if_data.ifi_mtu
175 #define if_type if_data.ifi_type
176 #define if_physical if_data.ifi_physical
177 #define if_addrlen if_data.ifi_addrlen
178 #define if_hdrlen if_data.ifi_hdrlen
179 #define if_metric if_data.ifi_metric
180 #define if_baudrate if_data.ifi_baudrate
181 #define if_hwassist if_data.ifi_hwassist
182 #define if_ipackets if_data.ifi_ipackets
183 #define if_ierrors if_data.ifi_ierrors
184 #define if_opackets if_data.ifi_opackets
185 #define if_oerrors if_data.ifi_oerrors
186 #define if_collisions if_data.ifi_collisions
187 #define if_ibytes if_data.ifi_ibytes
188 #define if_obytes if_data.ifi_obytes
189 #define if_imcasts if_data.ifi_imcasts
190 #define if_omcasts if_data.ifi_omcasts
191 #define if_iqdrops if_data.ifi_iqdrops
192 #define if_noproto if_data.ifi_noproto
193 #define if_lastchange if_data.ifi_lastchange
194 #define if_recvquota if_data.ifi_recvquota
195 #define if_xmitquota if_data.ifi_xmitquota
196 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
198 /* for compatibility with other BSDs */
199 #define if_addrlist if_addrhead
200 #define if_list if_link
203 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
204 * are queues of messages stored on ifqueue structures
205 * (defined above). Entries are added to and deleted from these structures
206 * by these macros, which should be called with ipl raised to splimp().
208 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
209 #define IF_DROP(ifq) ((ifq)->ifq_drops++)
210 #define IF_ENQUEUE(ifq, m) { \
211 (m)->m_nextpkt = 0; \
212 if ((ifq)->ifq_tail == 0) \
213 (ifq)->ifq_head = m; \
215 (ifq)->ifq_tail->m_nextpkt = m; \
216 (ifq)->ifq_tail = m; \
219 #define IF_PREPEND(ifq, m) { \
220 (m)->m_nextpkt = (ifq)->ifq_head; \
221 if ((ifq)->ifq_tail == 0) \
222 (ifq)->ifq_tail = (m); \
223 (ifq)->ifq_head = (m); \
226 #define IF_DEQUEUE(ifq, m) { \
227 (m) = (ifq)->ifq_head; \
229 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
230 (ifq)->ifq_tail = 0; \
231 (m)->m_nextpkt = 0; \
235 #define IF_DRAIN(ifq) do { \
238 IF_DEQUEUE(ifq, m); \
248 * #define _IF_QFULL for compatibility with -current
250 #define _IF_QFULL(ifq) IF_QFULL(ifq)
252 #define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
253 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
256 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
258 int need_if_start = 0;
268 ifp->if_obytes += m->m_pkthdr.len + adjust;
269 if (m->m_flags & M_MCAST)
271 need_if_start = !(ifp->if_flags & IFF_OACTIVE);
275 (*ifp->if_start)(ifp);
281 * 72 was chosen below because it is the size of a TCP/IP
282 * header (40) + the minimum mss (32).
285 #define IF_MAXMTU 65535
290 * The ifaddr structure contains information about one address
291 * of an interface. They are maintained by the different address families,
292 * are allocated and attached when an address is set, and are linked
293 * together so all addresses for an interface can be located.
296 struct sockaddr *ifa_addr; /* address of interface */
297 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
298 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
299 struct sockaddr *ifa_netmask; /* used to determine subnet */
300 struct if_data if_data; /* not all members are meaningful */
301 struct ifnet *ifa_ifp; /* back-pointer to interface */
302 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
303 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
304 (int, struct rtentry *, struct rt_addrinfo *);
305 u_short ifa_flags; /* mostly rt_flags for cloning */
306 u_int ifa_refcnt; /* references to this structure */
307 int ifa_metric; /* cost of going out this interface */
309 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
311 int (*ifa_claim_addr) /* check if an addr goes to this if */
312 (struct ifaddr *, struct sockaddr *);
315 #define IFA_ROUTE RTF_UP /* route installed */
317 /* for compatibility with other BSDs */
318 #define ifa_list ifa_link
321 * The prefix structure contains information about one prefix
322 * of an interface. They are maintained by the different address families,
323 * are allocated and attached when an prefix or an address is set,
324 * and are linked together so all prefixes for an interface can be located.
327 struct sockaddr *ifpr_prefix; /* prefix of interface */
328 struct ifnet *ifpr_ifp; /* back-pointer to interface */
329 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
330 u_char ifpr_plen; /* prefix length in bits */
331 u_char ifpr_type; /* protocol dependent prefix type */
335 * Multicast address structure. This is analogous to the ifaddr
336 * structure except that it keeps track of multicast addresses.
337 * Also, the reference count here is a count of requests for this
338 * address, not a count of pointers to this structure.
341 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
342 struct sockaddr *ifma_addr; /* address this membership is for */
343 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
344 struct ifnet *ifma_ifp; /* back-pointer to interface */
345 u_int ifma_refcount; /* reference count */
346 void *ifma_protospec; /* protocol-specific state, if any */
350 #define IFAFREE(ifa) \
352 if ((ifa)->ifa_refcnt <= 0) \
355 (ifa)->ifa_refcnt--; \
358 extern struct ifnethead ifnet;
359 extern struct ifnet **ifindex2ifnet;
360 extern int ifqmaxlen;
361 extern struct ifnet loif[];
363 extern struct ifaddr **ifnet_addrs;
365 void ether_ifattach(struct ifnet *, uint8_t *);
366 void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int);
367 void ether_ifdetach(struct ifnet *);
368 void ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
369 void ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
370 int ether_output(struct ifnet *,
371 struct mbuf *, struct sockaddr *, struct rtentry *);
372 int ether_output_frame(struct ifnet *, struct mbuf *);
373 int ether_ioctl(struct ifnet *, int, caddr_t);
375 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
376 int if_allmulti(struct ifnet *, int);
377 void if_attach(struct ifnet *);
378 int if_delmulti(struct ifnet *, struct sockaddr *);
379 void if_detach(struct ifnet *);
380 void if_down(struct ifnet *);
381 void if_initname(struct ifnet *, const char *, int);
382 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
383 void if_route(struct ifnet *, int flag, int fam);
384 int if_setlladdr(struct ifnet *, const u_char *, int);
385 void if_unroute(struct ifnet *, int flag, int fam);
386 void if_up(struct ifnet *);
387 /*void ifinit(void);*/ /* declared in systm.h for main() */
388 int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
389 int ifpromisc(struct ifnet *, int);
390 struct ifnet *ifunit(const char *);
391 struct ifnet *if_withname(struct sockaddr *);
393 struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
394 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
395 struct ifaddr *ifa_ifwithnet(struct sockaddr *);
396 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
397 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
398 void ifafree(struct ifaddr *);
400 struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
401 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
403 void if_clone_attach(struct if_clone *);
404 void if_clone_detach(struct if_clone *);
406 int if_clone_create(char *, int);
407 int if_clone_destroy(const char *);
409 #define IF_LLADDR(ifp) \
410 LLADDR((struct sockaddr_dl *) ifnet_addrs[ifp->if_index - 1]->ifa_addr)
412 #ifdef DEVICE_POLLING
413 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER };
415 typedef void poll_handler_t (struct ifnet *ifp,
416 enum poll_cmd cmd, int count);
417 int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
418 int ether_poll_deregister(struct ifnet *ifp);
419 #endif /* DEVICE_POLLING */
422 #endif /* !_NET_IF_VAR_H_ */