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
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14 * must display the following acknowledgement:
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 1.21 2005/01/23 13:47:24 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
70 * Forward structure declarations for function prototypes [sic].
81 #include <sys/queue.h> /* get TAILQ macros */
84 #include <sys/eventhandler.h>
86 #include <sys/systm.h> /* XXX */
89 #define IF_DUNIT_NONE -1
91 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
92 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
93 TAILQ_HEAD(ifprefixhead, ifprefix);
94 LIST_HEAD(ifmultihead, ifmultiaddr);
97 * Structure defining a queue for a network interface.
100 struct mbuf *ifq_head;
101 struct mbuf *ifq_tail;
108 * Structure defining a network interface.
110 * (Would like to call this struct ``if'', but C isn't PL/1.)
114 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
115 * one of these structures, typically held within an arpcom structure.
117 * struct <foo>_softc {
119 * struct ifnet ac_if;
125 * The assumption is used in a number of places, including many
126 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
128 * Unfortunately devices' softc are opaque, so we depend on this layout
129 * to locate the struct ifnet from the softc in the generic code.
131 * Note that not all fields are used by drivers in the FreeBSD source
132 * tree. However, who knows what third party software does with fields
133 * marked as "unused", such as if_ipending, if_done, and if_poll*,
134 * so any attemt to redefine their meaning might end up in binary
135 * compatibility problems, even if the size of struct ifnet, and
136 * the size and position of its fields do not change.
137 * We just have to live with that.
140 void *if_softc; /* pointer to driver state */
141 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
142 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
143 const char *if_dname; /* driver name */
144 int if_dunit; /* unit or IF_DUNIT_NONE */
145 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
146 int if_pcount; /* number of promiscuous listeners */
147 struct bpf_if *if_bpf; /* packet filter structure */
148 u_short if_index; /* numeric abbreviation for this if */
149 short if_timer; /* time 'til if_watchdog called */
150 int if_flags; /* up/down, broadcast, etc. */
151 int if_capabilities; /* interface capabilities */
152 int if_capenable; /* enabled features */
153 void *if_linkmib; /* link-type-specific MIB data */
154 size_t if_linkmiblen; /* length of above data */
155 struct if_data if_data;
156 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
157 int if_amcount; /* number of all-multicast requests */
158 /* procedure handles */
159 int (*if_output) /* output routine (enqueue) */
160 (struct ifnet *, struct mbuf *, struct sockaddr *,
162 void (*if_input) /* input routine from hardware driver */
163 (struct ifnet *, struct mbuf *);
164 void (*if_start) /* initiate output routine */
166 int (*if_ioctl) /* ioctl routine */
167 (struct ifnet *, u_long, caddr_t, struct ucred *);
168 void (*if_watchdog) /* timer routine */
170 void (*if_init) /* Init routine */
172 int (*if_resolvemulti) /* validate/resolve multicast */
173 (struct ifnet *, struct sockaddr **, struct sockaddr *);
174 struct ifqueue if_snd; /* output queue */
175 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
176 const uint8_t *if_broadcastaddr;
178 typedef void if_init_f_t (void *);
180 #define if_mtu if_data.ifi_mtu
181 #define if_type if_data.ifi_type
182 #define if_physical if_data.ifi_physical
183 #define if_addrlen if_data.ifi_addrlen
184 #define if_hdrlen if_data.ifi_hdrlen
185 #define if_metric if_data.ifi_metric
186 #define if_baudrate if_data.ifi_baudrate
187 #define if_hwassist if_data.ifi_hwassist
188 #define if_ipackets if_data.ifi_ipackets
189 #define if_ierrors if_data.ifi_ierrors
190 #define if_opackets if_data.ifi_opackets
191 #define if_oerrors if_data.ifi_oerrors
192 #define if_collisions if_data.ifi_collisions
193 #define if_ibytes if_data.ifi_ibytes
194 #define if_obytes if_data.ifi_obytes
195 #define if_imcasts if_data.ifi_imcasts
196 #define if_omcasts if_data.ifi_omcasts
197 #define if_iqdrops if_data.ifi_iqdrops
198 #define if_noproto if_data.ifi_noproto
199 #define if_lastchange if_data.ifi_lastchange
200 #define if_recvquota if_data.ifi_recvquota
201 #define if_xmitquota if_data.ifi_xmitquota
202 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
204 /* for compatibility with other BSDs */
205 #define if_addrlist if_addrhead
206 #define if_list if_link
209 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
210 * are queues of messages stored on ifqueue structures
211 * (defined above). Entries are added to and deleted from these structures
212 * by these macros, which should be called with ipl raised to splimp().
214 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
215 #define IF_DROP(ifq) ((ifq)->ifq_drops++)
216 #define IF_QLEN(ifq) ((ifq)->ifq_len)
217 #define IF_QEMPTY(ifq) (IF_QLEN(ifq) == 0)
218 #define IF_ENQUEUE(ifq, m) { \
219 (m)->m_nextpkt = 0; \
220 if ((ifq)->ifq_tail == 0) \
221 (ifq)->ifq_head = m; \
223 (ifq)->ifq_tail->m_nextpkt = m; \
224 (ifq)->ifq_tail = m; \
227 #define IF_PREPEND(ifq, m) { \
228 (m)->m_nextpkt = (ifq)->ifq_head; \
229 if ((ifq)->ifq_tail == 0) \
230 (ifq)->ifq_tail = (m); \
231 (ifq)->ifq_head = (m); \
234 #define IF_DEQUEUE(ifq, m) { \
235 (m) = (ifq)->ifq_head; \
237 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
238 (ifq)->ifq_tail = 0; \
239 (m)->m_nextpkt = 0; \
244 #define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
246 #define IF_DRAIN(ifq) do { \
249 IF_DEQUEUE(ifq, m); \
258 #define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
259 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
262 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
264 int need_if_start = 0;
274 ifp->if_obytes += m->m_pkthdr.len + adjust;
275 if (m->m_flags & M_MCAST)
277 need_if_start = !(ifp->if_flags & IFF_OACTIVE);
281 (*ifp->if_start)(ifp);
286 #define IFQ_ENQUEUE(ifq, m, err) \
288 if (IF_QFULL(ifq)) { \
292 IF_ENQUEUE(ifq, m); \
296 (ifq)->ifq_drops++; \
299 #define IFQ_DEQUEUE(ifq, m) IF_DEQUEUE(ifq, m)
300 #define IFQ_POLL(ifq, m) IF_POLL(ifq, m)
301 #define IFQ_PURGE(ifq) IF_DRAIN(ifq)
303 #define IFQ_SET_READY(ifq) /* nothing */
305 #define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
306 #define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
307 #define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
308 #define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
309 #define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
311 #define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
316 len = (m)->m_pkthdr.len; \
317 mflags = (m)->m_flags; \
318 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
320 (ifp)->if_obytes += len + (adj); \
321 if (mflags & M_MCAST) \
322 (ifp)->if_omcasts++; \
323 if (((ifp)->if_flags & IFF_OACTIVE) == 0) \
324 (*(ifp)->if_start)(ifp); \
328 #define IFQ_HANDOFF(ifp, m, err) \
329 IFQ_HANDOFF_ADJ(ifp, m, 0, err)
331 #define IFQ_DRV_DEQUEUE(ifq, m) \
333 (m) = (ifq)->ifq_drv_head; \
335 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
336 (ifq)->ifq_drv_tail = NULL; \
337 (m)->m_nextpkt = NULL; \
338 (ifq)->ifq_drv_len--; \
340 IFQ_DEQUEUE(ifq, m); \
341 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
343 IFQ_DEQUEUE(ifq, m0); \
346 m0->m_nextpkt = NULL; \
347 if ((ifq)->ifq_drv_tail == NULL) \
348 (ifq)->ifq_drv_head = m0; \
350 (ifq)->ifq_drv_tail->m_nextpkt = m0; \
351 (ifq)->ifq_drv_tail = m0; \
352 (ifq)->ifq_drv_len++; \
357 #define IFQ_DRV_PREPEND(ifq, m) \
359 (m)->m_nextpkt = (ifq)->ifq_drv_head; \
360 if ((ifq)->ifq_tail == NULL) \
361 (ifq)->ifq_tail = (m); \
362 (ifq)->ifq_drv_head = (m); \
363 (ifq)->ifq_drv_len++; \
366 #define IFQ_DRV_IS_EMPTY(ifq) \
367 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
369 #define IFQ_DRV_PURGE(ifq) \
371 struct mbuf *m = (ifq)->ifq_drv_head; \
376 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
377 (ifq)->ifq_drv_len = 0; \
382 * 72 was chosen below because it is the size of a TCP/IP
383 * header (40) + the minimum mss (32).
386 #define IF_MAXMTU 65535
391 * The ifaddr structure contains information about one address
392 * of an interface. They are maintained by the different address families,
393 * are allocated and attached when an address is set, and are linked
394 * together so all addresses for an interface can be located.
397 struct sockaddr *ifa_addr; /* address of interface */
398 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
399 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
400 struct sockaddr *ifa_netmask; /* used to determine subnet */
401 struct if_data if_data; /* not all members are meaningful */
402 struct ifnet *ifa_ifp; /* back-pointer to interface */
403 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
404 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
405 (int, struct rtentry *, struct rt_addrinfo *);
406 u_short ifa_flags; /* mostly rt_flags for cloning */
407 u_int ifa_refcnt; /* references to this structure */
408 int ifa_metric; /* cost of going out this interface */
410 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
412 int (*ifa_claim_addr) /* check if an addr goes to this if */
413 (struct ifaddr *, struct sockaddr *);
416 #define IFA_ROUTE RTF_UP /* route installed */
418 /* for compatibility with other BSDs */
419 #define ifa_list ifa_link
422 * The prefix structure contains information about one prefix
423 * of an interface. They are maintained by the different address families,
424 * are allocated and attached when an prefix or an address is set,
425 * and are linked together so all prefixes for an interface can be located.
428 struct sockaddr *ifpr_prefix; /* prefix of interface */
429 struct ifnet *ifpr_ifp; /* back-pointer to interface */
430 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
431 u_char ifpr_plen; /* prefix length in bits */
432 u_char ifpr_type; /* protocol dependent prefix type */
436 * Multicast address structure. This is analogous to the ifaddr
437 * structure except that it keeps track of multicast addresses.
438 * Also, the reference count here is a count of requests for this
439 * address, not a count of pointers to this structure.
442 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
443 struct sockaddr *ifma_addr; /* address this membership is for */
444 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
445 struct ifnet *ifma_ifp; /* back-pointer to interface */
446 u_int ifma_refcount; /* reference count */
447 void *ifma_protospec; /* protocol-specific state, if any */
451 /* interface address change event */
452 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
453 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
454 /* new interface attach event */
455 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
456 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
457 /* interface detach event */
458 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
459 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
460 /* interface clone event */
461 typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
462 EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
465 IFAREF(struct ifaddr *ifa)
470 #include <sys/malloc.h>
472 MALLOC_DECLARE(M_IFADDR);
473 MALLOC_DECLARE(M_IFMADDR);
476 IFAFREE(struct ifaddr *ifa)
478 if (ifa->ifa_refcnt <= 0)
484 extern struct ifnethead ifnet;
485 extern struct ifnet **ifindex2ifnet;
486 extern int ifqmaxlen;
487 extern struct ifnet loif[];
489 extern struct ifaddr **ifnet_addrs;
491 void ether_ifattach(struct ifnet *, uint8_t *);
492 void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int);
493 void ether_ifdetach(struct ifnet *);
494 void ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
495 void ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
496 int ether_output_frame(struct ifnet *, struct mbuf *);
497 int ether_ioctl(struct ifnet *, int, caddr_t);
498 uint32_t ether_crc32_le(const uint8_t *, size_t);
499 uint32_t ether_crc32_be(const uint8_t *, size_t);
501 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
502 int if_allmulti(struct ifnet *, int);
503 void if_attach(struct ifnet *);
504 int if_delmulti(struct ifnet *, struct sockaddr *);
505 void if_detach(struct ifnet *);
506 void if_down(struct ifnet *);
507 void if_initname(struct ifnet *, const char *, int);
508 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
509 void if_route(struct ifnet *, int flag, int fam);
510 int if_setlladdr(struct ifnet *, const u_char *, int);
511 void if_unroute(struct ifnet *, int flag, int fam);
512 void if_up(struct ifnet *);
513 /*void ifinit(void);*/ /* declared in systm.h for main() */
514 int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
515 int ifpromisc(struct ifnet *, int);
516 struct ifnet *ifunit(const char *);
517 struct ifnet *if_withname(struct sockaddr *);
519 struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
520 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
521 struct ifaddr *ifa_ifwithnet(struct sockaddr *);
522 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
523 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
525 struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
526 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
528 void if_clone_attach(struct if_clone *);
529 void if_clone_detach(struct if_clone *);
531 int if_clone_create(char *, int);
532 int if_clone_destroy(const char *);
534 #define IF_LLADDR(ifp) \
535 LLADDR((struct sockaddr_dl *) ifnet_addrs[ifp->if_index - 1]->ifa_addr)
537 #ifdef DEVICE_POLLING
538 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER };
540 typedef void poll_handler_t (struct ifnet *ifp,
541 enum poll_cmd cmd, int count);
542 int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
543 int ether_poll_deregister(struct ifnet *ifp);
544 void emergency_poll_enable(const char *name);
545 #endif /* DEVICE_POLLING */
548 #endif /* !_NET_IF_VAR_H_ */