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#ifdef __STDC__
62/*
63 * Forward structure declarations for function prototypes [sic].
64 */
65struct mbuf;
66struct thread;
67struct rtentry;
68struct rt_addrinfo;
69struct socket;
70struct ether_header;
71struct carp_if;
72struct ifvlantrunk;
73#endif
74
75#include <sys/queue.h> /* get TAILQ macros */
76
77#ifdef _KERNEL
78#include <sys/mbuf.h>
79#include <sys/eventhandler.h>
80#endif /* _KERNEL */
81#include <sys/lock.h> /* XXX */
82#include <sys/mutex.h> /* XXX */
83#include <sys/event.h> /* XXX */
84#include <sys/_task.h>
85
86#define IF_DUNIT_NONE -1
87
88#include <altq/if_altq.h>
89
90TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
91TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
92TAILQ_HEAD(ifprefixhead, ifprefix);
93TAILQ_HEAD(ifmultihead, ifmultiaddr);
94TAILQ_HEAD(ifgrouphead, ifg_group);
95
96/*
97 * Structure defining a queue for a network interface.
98 */
99struct ifqueue {
100 struct mbuf *ifq_head;
101 struct mbuf *ifq_tail;
102 int ifq_len;
103 int ifq_maxlen;
104 int ifq_drops;
105 struct mtx ifq_mtx;
106};
107
108/*
109 * Structure defining a network interface.
110 *
111 * (Would like to call this struct ``if'', but C isn't PL/1.)
112 */
113
114struct ifnet {
115 void *if_softc; /* pointer to driver state */
116 void *if_l2com; /* pointer to protocol bits */
117 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
118 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
119 const char *if_dname; /* driver name */
120 int if_dunit; /* unit or IF_DUNIT_NONE */
121 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
122 /*
123 * if_addrhead is the list of all addresses associated to
124 * an interface.
125 * Some code in the kernel assumes that first element
126 * of the list has type AF_LINK, and contains sockaddr_dl
127 * addresses which store the link-level address and the name
128 * of the interface.
129 * However, access to the AF_LINK address through this
130 * field is deprecated. Use if_addr or ifaddr_byindex() instead.
131 */
132 struct knlist if_klist; /* events attached to this if */
133 int if_pcount; /* number of promiscuous listeners */
134 struct carp_if *if_carp; /* carp interface structure */
135 struct bpf_if *if_bpf; /* packet filter structure */
136 u_short if_index; /* numeric abbreviation for this if */
137 short if_timer; /* time 'til if_watchdog called */
138 struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
139 int if_flags; /* up/down, broadcast, etc. */
140 int if_capabilities; /* interface features & capabilities */
141 int if_capenable; /* enabled features & capabilities */
142 void *if_linkmib; /* link-type-specific MIB data */
143 size_t if_linkmiblen; /* length of above data */
144 struct if_data if_data;
145 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
146 int if_amcount; /* number of all-multicast requests */
147/* procedure handles */
148 int (*if_output) /* output routine (enqueue) */
149 (struct ifnet *, struct mbuf *, struct sockaddr *,
150 struct rtentry *);
151 void (*if_input) /* input routine (from h/w driver) */
152 (struct ifnet *, struct mbuf *);
153 void (*if_start) /* initiate output routine */
154 (struct ifnet *);
155 int (*if_ioctl) /* ioctl routine */
156 (struct ifnet *, u_long, caddr_t);
157 void (*if_watchdog) /* timer routine */
158 (struct ifnet *);
159 void (*if_init) /* Init routine */
160 (void *);
161 int (*if_resolvemulti) /* validate/resolve multicast */
162 (struct ifnet *, struct sockaddr **, struct sockaddr *);
163 struct ifaddr *if_addr; /* pointer to link-level address */
164 void *if_spare2; /* spare pointer 2 */
165 void *if_spare3; /* spare pointer 3 */
166 int if_drv_flags; /* driver-managed status flags */
167 u_int if_spare_flags2; /* spare flags 2 */
168 struct ifaltq if_snd; /* output queue (includes altq) */
169 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
170
171 void *if_bridge; /* bridge glue */
172
173 struct lltable *lltables; /* list of L3-L2 resolution tables */
174
175 struct label *if_label; /* interface MAC label */
176
177 /* these are only used by IPv6 */
178 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
179 void *if_afdata[AF_MAX];
180 int if_afdata_initialized;
181 struct mtx if_afdata_mtx;
182 struct task if_starttask; /* task for IFF_NEEDSGIANT */
183 struct task if_linktask; /* task for link change events */
184 struct mtx if_addr_mtx; /* mutex to protect address lists */
185 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */
186 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
187 /* protected by if_addr_mtx */
188 void *if_pf_kif;
|
190};
191
192typedef void if_init_f_t(void *);
193
194/*
195 * XXX These aliases are terribly dangerous because they could apply
196 * to anything.
197 */
198#define if_mtu if_data.ifi_mtu
199#define if_type if_data.ifi_type
200#define if_physical if_data.ifi_physical
201#define if_addrlen if_data.ifi_addrlen
202#define if_hdrlen if_data.ifi_hdrlen
203#define if_metric if_data.ifi_metric
204#define if_link_state if_data.ifi_link_state
205#define if_baudrate if_data.ifi_baudrate
206#define if_hwassist if_data.ifi_hwassist
207#define if_ipackets if_data.ifi_ipackets
208#define if_ierrors if_data.ifi_ierrors
209#define if_opackets if_data.ifi_opackets
210#define if_oerrors if_data.ifi_oerrors
211#define if_collisions if_data.ifi_collisions
212#define if_ibytes if_data.ifi_ibytes
213#define if_obytes if_data.ifi_obytes
214#define if_imcasts if_data.ifi_imcasts
215#define if_omcasts if_data.ifi_omcasts
216#define if_iqdrops if_data.ifi_iqdrops
217#define if_noproto if_data.ifi_noproto
218#define if_lastchange if_data.ifi_lastchange
219#define if_recvquota if_data.ifi_recvquota
220#define if_xmitquota if_data.ifi_xmitquota
221#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL)
222
223/* for compatibility with other BSDs */
224#define if_addrlist if_addrhead
225#define if_list if_link
226#define if_name(ifp) ((ifp)->if_xname)
227
228/*
229 * Locks for address lists on the network interface.
230 */
231#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \
232 "if_addr_mtx", NULL, MTX_DEF)
233#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx)
234#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx)
235#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx)
236#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
237
238/*
239 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
240 * are queues of messages stored on ifqueue structures
241 * (defined above). Entries are added to and deleted from these structures
242 * by these macros, which should be called with ipl raised to splimp().
243 */
244#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx)
245#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx)
246#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
247#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
248#define _IF_DROP(ifq) ((ifq)->ifq_drops++)
249#define _IF_QLEN(ifq) ((ifq)->ifq_len)
250
251#define _IF_ENQUEUE(ifq, m) do { \
252 (m)->m_nextpkt = NULL; \
253 if ((ifq)->ifq_tail == NULL) \
254 (ifq)->ifq_head = m; \
255 else \
256 (ifq)->ifq_tail->m_nextpkt = m; \
257 (ifq)->ifq_tail = m; \
258 (ifq)->ifq_len++; \
259} while (0)
260
261#define IF_ENQUEUE(ifq, m) do { \
262 IF_LOCK(ifq); \
263 _IF_ENQUEUE(ifq, m); \
264 IF_UNLOCK(ifq); \
265} while (0)
266
267#define _IF_PREPEND(ifq, m) do { \
268 (m)->m_nextpkt = (ifq)->ifq_head; \
269 if ((ifq)->ifq_tail == NULL) \
270 (ifq)->ifq_tail = (m); \
271 (ifq)->ifq_head = (m); \
272 (ifq)->ifq_len++; \
273} while (0)
274
275#define IF_PREPEND(ifq, m) do { \
276 IF_LOCK(ifq); \
277 _IF_PREPEND(ifq, m); \
278 IF_UNLOCK(ifq); \
279} while (0)
280
281#define _IF_DEQUEUE(ifq, m) do { \
282 (m) = (ifq)->ifq_head; \
283 if (m) { \
284 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
285 (ifq)->ifq_tail = NULL; \
286 (m)->m_nextpkt = NULL; \
287 (ifq)->ifq_len--; \
288 } \
289} while (0)
290
291#define IF_DEQUEUE(ifq, m) do { \
292 IF_LOCK(ifq); \
293 _IF_DEQUEUE(ifq, m); \
294 IF_UNLOCK(ifq); \
295} while (0)
296
297#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
298#define IF_POLL(ifq, m) _IF_POLL(ifq, m)
299
300#define _IF_DRAIN(ifq) do { \
301 struct mbuf *m; \
302 for (;;) { \
303 _IF_DEQUEUE(ifq, m); \
304 if (m == NULL) \
305 break; \
306 m_freem(m); \
307 } \
308} while (0)
309
310#define IF_DRAIN(ifq) do { \
311 IF_LOCK(ifq); \
312 _IF_DRAIN(ifq); \
313 IF_UNLOCK(ifq); \
314} while(0)
315
316#ifdef _KERNEL
317/* interface address change event */
318typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
319EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
320/* new interface arrival event */
321typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
322EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
323/* interface departure event */
324typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
325EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
326
327/*
328 * interface groups
329 */
330struct ifg_group {
331 char ifg_group[IFNAMSIZ];
332 u_int ifg_refcnt;
333 void *ifg_pf_kif;
334 TAILQ_HEAD(, ifg_member) ifg_members;
335 TAILQ_ENTRY(ifg_group) ifg_next;
336};
337
338struct ifg_member {
339 TAILQ_ENTRY(ifg_member) ifgm_next;
340 struct ifnet *ifgm_ifp;
341};
342
343struct ifg_list {
344 struct ifg_group *ifgl_group;
345 TAILQ_ENTRY(ifg_list) ifgl_next;
346};
347
348/* group attach event */
349typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
350EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
351/* group detach event */
352typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
353EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
354/* group change event */
355typedef void (*group_change_event_handler_t)(void *, const char *);
356EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
357
358#define IF_AFDATA_LOCK_INIT(ifp) \
359 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF)
360#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx)
361#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx)
362#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx)
363#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx)
364
365#define IFF_LOCKGIANT(ifp) do { \
366 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
367 mtx_lock(&Giant); \
368} while (0)
369
370#define IFF_UNLOCKGIANT(ifp) do { \
371 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
372 mtx_unlock(&Giant); \
373} while (0)
374
375int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
376 int adjust);
377#define IF_HANDOFF(ifq, m, ifp) \
378 if_handoff((struct ifqueue *)ifq, m, ifp, 0)
379#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \
380 if_handoff((struct ifqueue *)ifq, m, ifp, adj)
381
382void if_start(struct ifnet *);
383
384#define IFQ_ENQUEUE(ifq, m, err) \
385do { \
386 IF_LOCK(ifq); \
387 if (ALTQ_IS_ENABLED(ifq)) \
388 ALTQ_ENQUEUE(ifq, m, NULL, err); \
389 else { \
390 if (_IF_QFULL(ifq)) { \
391 m_freem(m); \
392 (err) = ENOBUFS; \
393 } else { \
394 _IF_ENQUEUE(ifq, m); \
395 (err) = 0; \
396 } \
397 } \
398 if (err) \
399 (ifq)->ifq_drops++; \
400 IF_UNLOCK(ifq); \
401} while (0)
402
403#define IFQ_DEQUEUE_NOLOCK(ifq, m) \
404do { \
405 if (TBR_IS_ENABLED(ifq)) \
406 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \
407 else if (ALTQ_IS_ENABLED(ifq)) \
408 ALTQ_DEQUEUE(ifq, m); \
409 else \
410 _IF_DEQUEUE(ifq, m); \
411} while (0)
412
413#define IFQ_DEQUEUE(ifq, m) \
414do { \
415 IF_LOCK(ifq); \
416 IFQ_DEQUEUE_NOLOCK(ifq, m); \
417 IF_UNLOCK(ifq); \
418} while (0)
419
420#define IFQ_POLL_NOLOCK(ifq, m) \
421do { \
422 if (TBR_IS_ENABLED(ifq)) \
423 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \
424 else if (ALTQ_IS_ENABLED(ifq)) \
425 ALTQ_POLL(ifq, m); \
426 else \
427 _IF_POLL(ifq, m); \
428} while (0)
429
430#define IFQ_POLL(ifq, m) \
431do { \
432 IF_LOCK(ifq); \
433 IFQ_POLL_NOLOCK(ifq, m); \
434 IF_UNLOCK(ifq); \
435} while (0)
436
437#define IFQ_PURGE_NOLOCK(ifq) \
438do { \
439 if (ALTQ_IS_ENABLED(ifq)) { \
440 ALTQ_PURGE(ifq); \
441 } else \
442 _IF_DRAIN(ifq); \
443} while (0)
444
445#define IFQ_PURGE(ifq) \
446do { \
447 IF_LOCK(ifq); \
448 IFQ_PURGE_NOLOCK(ifq); \
449 IF_UNLOCK(ifq); \
450} while (0)
451
452#define IFQ_SET_READY(ifq) \
453 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
454
455#define IFQ_LOCK(ifq) IF_LOCK(ifq)
456#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq)
457#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq)
458#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
459#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
460#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
461#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
462#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
463
464/*
465 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
466 * the handoff logic, as that flag is locked by the device driver.
467 */
468#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
469do { \
470 int len; \
471 short mflags; \
472 \
473 len = (m)->m_pkthdr.len; \
474 mflags = (m)->m_flags; \
475 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
476 if ((err) == 0) { \
477 (ifp)->if_obytes += len + (adj); \
478 if (mflags & M_MCAST) \
479 (ifp)->if_omcasts++; \
480 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \
481 if_start(ifp); \
482 } \
483} while (0)
484
485#define IFQ_HANDOFF(ifp, m, err) \
486 IFQ_HANDOFF_ADJ(ifp, m, 0, err)
487
488#define IFQ_DRV_DEQUEUE(ifq, m) \
489do { \
490 (m) = (ifq)->ifq_drv_head; \
491 if (m) { \
492 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
493 (ifq)->ifq_drv_tail = NULL; \
494 (m)->m_nextpkt = NULL; \
495 (ifq)->ifq_drv_len--; \
496 } else { \
497 IFQ_LOCK(ifq); \
498 IFQ_DEQUEUE_NOLOCK(ifq, m); \
499 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
500 struct mbuf *m0; \
501 IFQ_DEQUEUE_NOLOCK(ifq, m0); \
502 if (m0 == NULL) \
503 break; \
504 m0->m_nextpkt = NULL; \
505 if ((ifq)->ifq_drv_tail == NULL) \
506 (ifq)->ifq_drv_head = m0; \
507 else \
508 (ifq)->ifq_drv_tail->m_nextpkt = m0; \
509 (ifq)->ifq_drv_tail = m0; \
510 (ifq)->ifq_drv_len++; \
511 } \
512 IFQ_UNLOCK(ifq); \
513 } \
514} while (0)
515
516#define IFQ_DRV_PREPEND(ifq, m) \
517do { \
518 (m)->m_nextpkt = (ifq)->ifq_drv_head; \
519 if ((ifq)->ifq_drv_tail == NULL) \
520 (ifq)->ifq_drv_tail = (m); \
521 (ifq)->ifq_drv_head = (m); \
522 (ifq)->ifq_drv_len++; \
523} while (0)
524
525#define IFQ_DRV_IS_EMPTY(ifq) \
526 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
527
528#define IFQ_DRV_PURGE(ifq) \
529do { \
530 struct mbuf *m, *n = (ifq)->ifq_drv_head; \
531 while((m = n) != NULL) { \
532 n = m->m_nextpkt; \
533 m_freem(m); \
534 } \
535 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
536 (ifq)->ifq_drv_len = 0; \
537 IFQ_PURGE(ifq); \
538} while (0)
539
540/*
541 * 72 was chosen below because it is the size of a TCP/IP
542 * header (40) + the minimum mss (32).
543 */
544#define IF_MINMTU 72
545#define IF_MAXMTU 65535
546
547#endif /* _KERNEL */
548
549/*
550 * The ifaddr structure contains information about one address
551 * of an interface. They are maintained by the different address families,
552 * are allocated and attached when an address is set, and are linked
553 * together so all addresses for an interface can be located.
554 *
555 * NOTE: a 'struct ifaddr' is always at the beginning of a larger
556 * chunk of malloc'ed memory, where we store the three addresses
557 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
558 */
559struct ifaddr {
560 struct sockaddr *ifa_addr; /* address of interface */
561 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
562#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
563 struct sockaddr *ifa_netmask; /* used to determine subnet */
564 struct if_data if_data; /* not all members are meaningful */
565 struct ifnet *ifa_ifp; /* back-pointer to interface */
566 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
567 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
568 (int, struct rtentry *, struct rt_addrinfo *);
569 u_short ifa_flags; /* mostly rt_flags for cloning */
570 u_int ifa_refcnt; /* references to this structure */
571 int ifa_metric; /* cost of going out this interface */
572 int (*ifa_claim_addr) /* check if an addr goes to this if */
573 (struct ifaddr *, struct sockaddr *);
574 struct mtx ifa_mtx;
575};
576#define IFA_ROUTE RTF_UP /* route installed */
577
578/* for compatibility with other BSDs */
579#define ifa_list ifa_link
580
581#define IFA_LOCK_INIT(ifa) \
582 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF)
583#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx)
584#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx)
585#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx)
586
587/*
588 * The prefix structure contains information about one prefix
589 * of an interface. They are maintained by the different address families,
590 * are allocated and attached when a prefix or an address is set,
591 * and are linked together so all prefixes for an interface can be located.
592 */
593struct ifprefix {
594 struct sockaddr *ifpr_prefix; /* prefix of interface */
595 struct ifnet *ifpr_ifp; /* back-pointer to interface */
596 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
597 u_char ifpr_plen; /* prefix length in bits */
598 u_char ifpr_type; /* protocol dependent prefix type */
599};
600
601/*
602 * Multicast address structure. This is analogous to the ifaddr
603 * structure except that it keeps track of multicast addresses.
604 */
605struct ifmultiaddr {
606 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
607 struct sockaddr *ifma_addr; /* address this membership is for */
608 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
609 struct ifnet *ifma_ifp; /* back-pointer to interface */
610 u_int ifma_refcount; /* reference count */
611 void *ifma_protospec; /* protocol-specific state, if any */
612 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
613};
614
615#ifdef _KERNEL
616#define IFAFREE(ifa) \
617 do { \
618 IFA_LOCK(ifa); \
619 KASSERT((ifa)->ifa_refcnt > 0, \
620 ("ifa %p !(ifa_refcnt > 0)", ifa)); \
621 if (--(ifa)->ifa_refcnt == 0) { \
622 IFA_DESTROY(ifa); \
623 free(ifa, M_IFADDR); \
624 } else \
625 IFA_UNLOCK(ifa); \
626 } while (0)
627
628#define IFAREF(ifa) \
629 do { \
630 IFA_LOCK(ifa); \
631 ++(ifa)->ifa_refcnt; \
632 IFA_UNLOCK(ifa); \
633 } while (0)
634
635extern struct mtx ifnet_lock;
636#define IFNET_LOCK_INIT() \
637 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE)
638#define IFNET_WLOCK() mtx_lock(&ifnet_lock)
639#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock)
640#define IFNET_RLOCK() IFNET_WLOCK()
641#define IFNET_RUNLOCK() IFNET_WUNLOCK()
642
643struct ifindex_entry {
644 struct ifnet *ife_ifnet;
645 struct cdev *ife_dev;
646};
647
648#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet
649/*
650 * Given the index, ifaddr_byindex() returns the one and only
651 * link-level ifaddr for the interface. You are not supposed to use
652 * it to traverse the list of addresses associated to the interface.
653 */
654#define ifaddr_byindex(idx) ifnet_byindex(idx)->if_addr
655#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev
656
657extern struct ifnethead ifnet;
658extern struct ifindex_entry *ifindex_table;
659extern int ifqmaxlen;
660extern struct ifnet *loif; /* first loopback interface */
661extern int if_index;
662
663int if_addgroup(struct ifnet *, const char *);
664int if_delgroup(struct ifnet *, const char *);
665int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
666int if_allmulti(struct ifnet *, int);
667struct ifnet* if_alloc(u_char);
668void if_attach(struct ifnet *);
669int if_delmulti(struct ifnet *, struct sockaddr *);
670void if_delmulti_ifma(struct ifmultiaddr *);
671void if_detach(struct ifnet *);
672void if_purgeaddrs(struct ifnet *);
673void if_down(struct ifnet *);
674struct ifmultiaddr *
675 if_findmulti(struct ifnet *, struct sockaddr *);
676void if_free(struct ifnet *);
677void if_free_type(struct ifnet *, u_char);
678void if_initname(struct ifnet *, const char *, int);
679void if_link_state_change(struct ifnet *, int);
680int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
681int if_setlladdr(struct ifnet *, const u_char *, int);
682void if_up(struct ifnet *);
683/*void ifinit(void);*/ /* declared in systm.h for main() */
684int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
685int ifpromisc(struct ifnet *, int);
686struct ifnet *ifunit(const char *);
687
688struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
689struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
690struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
691struct ifaddr *ifa_ifwithnet(struct sockaddr *);
692struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
693struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
694
695int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
696
697typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
698typedef void if_com_free_t(void *com, u_char type);
699void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
700void if_deregister_com_alloc(u_char type);
701
702#define IF_LLADDR(ifp) \
703 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
704
705#ifdef DEVICE_POLLING
706enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
707
708typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
709int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
710int ether_poll_deregister(struct ifnet *ifp);
711#endif /* DEVICE_POLLING */
712
713#endif /* _KERNEL */
714
715#endif /* !_NET_IF_VAR_H_ */
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