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_llsoftc; /* link layer softc */
165 int if_drv_flags; /* driver-managed status flags */
166 u_int if_spare_flags2; /* spare flags 2 */
167 struct ifaltq if_snd; /* output queue (includes altq) */
168 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
169
170 void *if_bridge; /* bridge glue */
171
172 struct lltable *lltables; /* list of L3-L2 resolution tables */
173
174 struct label *if_label; /* interface MAC label */
175
176 /* these are only used by IPv6 */
177 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
178 void *if_afdata[AF_MAX];
179 int if_afdata_initialized;
180 struct mtx if_afdata_mtx;
181 struct task if_starttask; /* task for IFF_NEEDSGIANT */
182 struct task if_linktask; /* task for link change events */
183 struct mtx if_addr_mtx; /* mutex to protect address lists */
184 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */
185 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
186 /* protected by if_addr_mtx */
187 void *if_pf_kif;
188 void *if_lagg; /* lagg glue */
189 void *if_pspare[8]; /* multiq/TOE 3; vimage 3; general use 4 */
190 void (*if_qflush) /* flush any queues */
191 (struct ifnet *);
192 int (*if_transmit) /* initiate output routine */
193 (struct ifnet *, struct mbuf *);
194 int if_ispare[2]; /* general use 2 */
195};
196
197typedef void if_init_f_t(void *);
198
199/*
200 * XXX These aliases are terribly dangerous because they could apply
201 * to anything.
202 */
203#define if_mtu if_data.ifi_mtu
204#define if_type if_data.ifi_type
205#define if_physical if_data.ifi_physical
206#define if_addrlen if_data.ifi_addrlen
207#define if_hdrlen if_data.ifi_hdrlen
208#define if_metric if_data.ifi_metric
209#define if_link_state if_data.ifi_link_state
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_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL)
225
226/* for compatibility with other BSDs */
227#define if_addrlist if_addrhead
228#define if_list if_link
229#define if_name(ifp) ((ifp)->if_xname)
230
231/*
232 * Locks for address lists on the network interface.
233 */
234#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \
235 "if_addr_mtx", NULL, MTX_DEF)
236#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx)
237#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx)
238#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx)
239#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
240
241/*
242 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
243 * are queues of messages stored on ifqueue structures
244 * (defined above). Entries are added to and deleted from these structures
245 * by these macros, which should be called with ipl raised to splimp().
246 */
247#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx)
248#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx)
249#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
250#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
251#define _IF_DROP(ifq) ((ifq)->ifq_drops++)
252#define _IF_QLEN(ifq) ((ifq)->ifq_len)
253
254#define _IF_ENQUEUE(ifq, m) do { \
255 (m)->m_nextpkt = NULL; \
256 if ((ifq)->ifq_tail == NULL) \
257 (ifq)->ifq_head = m; \
258 else \
259 (ifq)->ifq_tail->m_nextpkt = m; \
260 (ifq)->ifq_tail = m; \
261 (ifq)->ifq_len++; \
262} while (0)
263
264#define IF_ENQUEUE(ifq, m) do { \
265 IF_LOCK(ifq); \
266 _IF_ENQUEUE(ifq, m); \
267 IF_UNLOCK(ifq); \
268} while (0)
269
270#define _IF_PREPEND(ifq, m) do { \
271 (m)->m_nextpkt = (ifq)->ifq_head; \
272 if ((ifq)->ifq_tail == NULL) \
273 (ifq)->ifq_tail = (m); \
274 (ifq)->ifq_head = (m); \
275 (ifq)->ifq_len++; \
276} while (0)
277
278#define IF_PREPEND(ifq, m) do { \
279 IF_LOCK(ifq); \
280 _IF_PREPEND(ifq, m); \
281 IF_UNLOCK(ifq); \
282} while (0)
283
284#define _IF_DEQUEUE(ifq, m) do { \
285 (m) = (ifq)->ifq_head; \
286 if (m) { \
287 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
288 (ifq)->ifq_tail = NULL; \
289 (m)->m_nextpkt = NULL; \
290 (ifq)->ifq_len--; \
291 } \
292} while (0)
293
294#define IF_DEQUEUE(ifq, m) do { \
295 IF_LOCK(ifq); \
296 _IF_DEQUEUE(ifq, m); \
297 IF_UNLOCK(ifq); \
298} while (0)
299
300#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
301#define IF_POLL(ifq, m) _IF_POLL(ifq, m)
302
303#define _IF_DRAIN(ifq) do { \
304 struct mbuf *m; \
305 for (;;) { \
306 _IF_DEQUEUE(ifq, m); \
307 if (m == NULL) \
308 break; \
309 m_freem(m); \
310 } \
311} while (0)
312
313#define IF_DRAIN(ifq) do { \
314 IF_LOCK(ifq); \
315 _IF_DRAIN(ifq); \
316 IF_UNLOCK(ifq); \
317} while(0)
318
319#ifdef _KERNEL
320/* interface address change event */
321typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
322EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
323/* new interface arrival event */
324typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
325EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
326/* interface departure event */
327typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
328EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
329
330/*
331 * interface groups
332 */
333struct ifg_group {
334 char ifg_group[IFNAMSIZ];
335 u_int ifg_refcnt;
336 void *ifg_pf_kif;
337 TAILQ_HEAD(, ifg_member) ifg_members;
338 TAILQ_ENTRY(ifg_group) ifg_next;
339};
340
341struct ifg_member {
342 TAILQ_ENTRY(ifg_member) ifgm_next;
343 struct ifnet *ifgm_ifp;
344};
345
346struct ifg_list {
347 struct ifg_group *ifgl_group;
348 TAILQ_ENTRY(ifg_list) ifgl_next;
349};
350
351/* group attach event */
352typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
353EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
354/* group detach event */
355typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
356EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
357/* group change event */
358typedef void (*group_change_event_handler_t)(void *, const char *);
359EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
360
361#define IF_AFDATA_LOCK_INIT(ifp) \
362 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF)
363#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx)
364#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx)
365#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx)
366#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx)
367
368#define IFF_LOCKGIANT(ifp) do { \
369 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
370 mtx_lock(&Giant); \
371} while (0)
372
373#define IFF_UNLOCKGIANT(ifp) do { \
374 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
375 mtx_unlock(&Giant); \
376} while (0)
377
378int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
379 int adjust);
380#define IF_HANDOFF(ifq, m, ifp) \
381 if_handoff((struct ifqueue *)ifq, m, ifp, 0)
382#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \
383 if_handoff((struct ifqueue *)ifq, m, ifp, adj)
384
385void if_start(struct ifnet *);
386
387#define IFQ_ENQUEUE(ifq, m, err) \
388do { \
389 IF_LOCK(ifq); \
390 if (ALTQ_IS_ENABLED(ifq)) \
391 ALTQ_ENQUEUE(ifq, m, NULL, err); \
392 else { \
393 if (_IF_QFULL(ifq)) { \
394 m_freem(m); \
395 (err) = ENOBUFS; \
396 } else { \
397 _IF_ENQUEUE(ifq, m); \
398 (err) = 0; \
399 } \
400 } \
401 if (err) \
402 (ifq)->ifq_drops++; \
403 IF_UNLOCK(ifq); \
404} while (0)
405
406#define IFQ_DEQUEUE_NOLOCK(ifq, m) \
407do { \
408 if (TBR_IS_ENABLED(ifq)) \
409 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \
410 else if (ALTQ_IS_ENABLED(ifq)) \
411 ALTQ_DEQUEUE(ifq, m); \
412 else \
413 _IF_DEQUEUE(ifq, m); \
414} while (0)
415
416#define IFQ_DEQUEUE(ifq, m) \
417do { \
418 IF_LOCK(ifq); \
419 IFQ_DEQUEUE_NOLOCK(ifq, m); \
420 IF_UNLOCK(ifq); \
421} while (0)
422
423#define IFQ_POLL_NOLOCK(ifq, m) \
424do { \
425 if (TBR_IS_ENABLED(ifq)) \
426 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \
427 else if (ALTQ_IS_ENABLED(ifq)) \
428 ALTQ_POLL(ifq, m); \
429 else \
430 _IF_POLL(ifq, m); \
431} while (0)
432
433#define IFQ_POLL(ifq, m) \
434do { \
435 IF_LOCK(ifq); \
436 IFQ_POLL_NOLOCK(ifq, m); \
437 IF_UNLOCK(ifq); \
438} while (0)
439
440#define IFQ_PURGE_NOLOCK(ifq) \
441do { \
442 if (ALTQ_IS_ENABLED(ifq)) { \
443 ALTQ_PURGE(ifq); \
444 } else \
445 _IF_DRAIN(ifq); \
446} while (0)
447
448#define IFQ_PURGE(ifq) \
449do { \
450 IF_LOCK(ifq); \
451 IFQ_PURGE_NOLOCK(ifq); \
452 IF_UNLOCK(ifq); \
453} while (0)
454
455#define IFQ_SET_READY(ifq) \
456 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
457
458#define IFQ_LOCK(ifq) IF_LOCK(ifq)
459#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq)
460#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq)
461#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
462#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
463#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
464#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
465#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
466
467/*
468 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
469 * the handoff logic, as that flag is locked by the device driver.
470 */
471#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
472do { \
473 int len; \
474 short mflags; \
475 \
476 len = (m)->m_pkthdr.len; \
477 mflags = (m)->m_flags; \
478 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
479 if ((err) == 0) { \
480 (ifp)->if_obytes += len + (adj); \
481 if (mflags & M_MCAST) \
482 (ifp)->if_omcasts++; \
483 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \
484 if_start(ifp); \
485 } \
486} while (0)
487
488#define IFQ_HANDOFF(ifp, m, err) \
489 IFQ_HANDOFF_ADJ(ifp, m, 0, err)
490
491#define IFQ_DRV_DEQUEUE(ifq, m) \
492do { \
493 (m) = (ifq)->ifq_drv_head; \
494 if (m) { \
495 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
496 (ifq)->ifq_drv_tail = NULL; \
497 (m)->m_nextpkt = NULL; \
498 (ifq)->ifq_drv_len--; \
499 } else { \
500 IFQ_LOCK(ifq); \
501 IFQ_DEQUEUE_NOLOCK(ifq, m); \
502 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
503 struct mbuf *m0; \
504 IFQ_DEQUEUE_NOLOCK(ifq, m0); \
505 if (m0 == NULL) \
506 break; \
507 m0->m_nextpkt = NULL; \
508 if ((ifq)->ifq_drv_tail == NULL) \
509 (ifq)->ifq_drv_head = m0; \
510 else \
511 (ifq)->ifq_drv_tail->m_nextpkt = m0; \
512 (ifq)->ifq_drv_tail = m0; \
513 (ifq)->ifq_drv_len++; \
514 } \
515 IFQ_UNLOCK(ifq); \
516 } \
517} while (0)
518
519#define IFQ_DRV_PREPEND(ifq, m) \
520do { \
521 (m)->m_nextpkt = (ifq)->ifq_drv_head; \
522 if ((ifq)->ifq_drv_tail == NULL) \
523 (ifq)->ifq_drv_tail = (m); \
524 (ifq)->ifq_drv_head = (m); \
525 (ifq)->ifq_drv_len++; \
526} while (0)
527
528#define IFQ_DRV_IS_EMPTY(ifq) \
529 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
530
531#define IFQ_DRV_PURGE(ifq) \
532do { \
533 struct mbuf *m, *n = (ifq)->ifq_drv_head; \
534 while((m = n) != NULL) { \
535 n = m->m_nextpkt; \
536 m_freem(m); \
537 } \
538 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
539 (ifq)->ifq_drv_len = 0; \
540 IFQ_PURGE(ifq); \
541} while (0)
542
543/*
544 * 72 was chosen below because it is the size of a TCP/IP
545 * header (40) + the minimum mss (32).
546 */
547#define IF_MINMTU 72
548#define IF_MAXMTU 65535
549
550#endif /* _KERNEL */
551
552/*
553 * The ifaddr structure contains information about one address
554 * of an interface. They are maintained by the different address families,
555 * are allocated and attached when an address is set, and are linked
556 * together so all addresses for an interface can be located.
557 *
558 * NOTE: a 'struct ifaddr' is always at the beginning of a larger
559 * chunk of malloc'ed memory, where we store the three addresses
560 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
561 */
562struct ifaddr {
563 struct sockaddr *ifa_addr; /* address of interface */
564 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
565#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
566 struct sockaddr *ifa_netmask; /* used to determine subnet */
567 struct if_data if_data; /* not all members are meaningful */
568 struct ifnet *ifa_ifp; /* back-pointer to interface */
569 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
570 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
571 (int, struct rtentry *, struct rt_addrinfo *);
572 u_short ifa_flags; /* mostly rt_flags for cloning */
573 u_int ifa_refcnt; /* references to this structure */
574 int ifa_metric; /* cost of going out this interface */
575 int (*ifa_claim_addr) /* check if an addr goes to this if */
576 (struct ifaddr *, struct sockaddr *);
577 struct mtx ifa_mtx;
578};
579#define IFA_ROUTE RTF_UP /* route installed */
580
581/* for compatibility with other BSDs */
582#define ifa_list ifa_link
583
584#define IFA_LOCK_INIT(ifa) \
585 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF)
586#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx)
587#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx)
588#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx)
589
590/*
591 * The prefix structure contains information about one prefix
592 * of an interface. They are maintained by the different address families,
593 * are allocated and attached when a prefix or an address is set,
594 * and are linked together so all prefixes for an interface can be located.
595 */
596struct ifprefix {
597 struct sockaddr *ifpr_prefix; /* prefix of interface */
598 struct ifnet *ifpr_ifp; /* back-pointer to interface */
599 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
600 u_char ifpr_plen; /* prefix length in bits */
601 u_char ifpr_type; /* protocol dependent prefix type */
602};
603
604/*
605 * Multicast address structure. This is analogous to the ifaddr
606 * structure except that it keeps track of multicast addresses.
607 */
608struct ifmultiaddr {
609 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
610 struct sockaddr *ifma_addr; /* address this membership is for */
611 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
612 struct ifnet *ifma_ifp; /* back-pointer to interface */
613 u_int ifma_refcount; /* reference count */
614 void *ifma_protospec; /* protocol-specific state, if any */
615 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
616};
617
618#ifdef _KERNEL
619#define IFAFREE(ifa) \
620 do { \
621 IFA_LOCK(ifa); \
622 KASSERT((ifa)->ifa_refcnt > 0, \
623 ("ifa %p !(ifa_refcnt > 0)", ifa)); \
624 if (--(ifa)->ifa_refcnt == 0) { \
625 IFA_DESTROY(ifa); \
626 free(ifa, M_IFADDR); \
627 } else \
628 IFA_UNLOCK(ifa); \
629 } while (0)
630
631#define IFAREF(ifa) \
632 do { \
633 IFA_LOCK(ifa); \
634 ++(ifa)->ifa_refcnt; \
635 IFA_UNLOCK(ifa); \
636 } while (0)
637
638extern struct mtx ifnet_lock;
639#define IFNET_LOCK_INIT() \
640 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE)
641#define IFNET_WLOCK() mtx_lock(&ifnet_lock)
642#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock)
643#define IFNET_WLOCK_ASSERT() mtx_assert(&ifnet_lock, MA_OWNED)
644#define IFNET_RLOCK() IFNET_WLOCK()
645#define IFNET_RUNLOCK() IFNET_WUNLOCK()
646
647struct ifindex_entry {
648 struct ifnet *ife_ifnet;
649 struct cdev *ife_dev;
650};
651
652struct ifnet *ifnet_byindex(u_short idx);
653
654/*
655 * Given the index, ifaddr_byindex() returns the one and only
656 * link-level ifaddr for the interface. You are not supposed to use
657 * it to traverse the list of addresses associated to the interface.
658 */
659struct ifaddr *ifaddr_byindex(u_short idx);
660struct cdev *ifdev_byindex(u_short idx);
661
662extern struct ifnethead ifnet;
663extern int ifqmaxlen;
664extern struct ifnet *loif; /* first loopback interface */
665extern int if_index;
666
667int if_addgroup(struct ifnet *, const char *);
668int if_delgroup(struct ifnet *, const char *);
669int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
670int if_allmulti(struct ifnet *, int);
671struct ifnet* if_alloc(u_char);
672void if_attach(struct ifnet *);
673int if_delmulti(struct ifnet *, struct sockaddr *);
674void if_delmulti_ifma(struct ifmultiaddr *);
675void if_detach(struct ifnet *);
676void if_purgeaddrs(struct ifnet *);
677void if_purgemaddrs(struct ifnet *);
678void if_down(struct ifnet *);
679struct ifmultiaddr *
680 if_findmulti(struct ifnet *, struct sockaddr *);
681void if_free(struct ifnet *);
682void if_free_type(struct ifnet *, u_char);
683void if_initname(struct ifnet *, const char *, int);
684void if_link_state_change(struct ifnet *, int);
685int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
686int if_setlladdr(struct ifnet *, const u_char *, int);
687void if_up(struct ifnet *);
688/*void ifinit(void);*/ /* declared in systm.h for main() */
689int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
690int ifpromisc(struct ifnet *, int);
691struct ifnet *ifunit(const char *);
692
693void ifq_attach(struct ifaltq *, struct ifnet *ifp);
694void ifq_detach(struct ifaltq *);
695
696struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
697struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
698struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
699struct ifaddr *ifa_ifwithnet(struct sockaddr *);
700struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
701struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
702
703struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
704
705int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
706
707typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
708typedef void if_com_free_t(void *com, u_char type);
709void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
710void if_deregister_com_alloc(u_char type);
711
712#define IF_LLADDR(ifp) \
713 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
714
715#ifdef DEVICE_POLLING
716enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
717
718typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
719int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
720int ether_poll_deregister(struct ifnet *ifp);
721#endif /* DEVICE_POLLING */
722
| 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_llsoftc; /* link layer softc */
165 int if_drv_flags; /* driver-managed status flags */
166 u_int if_spare_flags2; /* spare flags 2 */
167 struct ifaltq if_snd; /* output queue (includes altq) */
168 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
169
170 void *if_bridge; /* bridge glue */
171
172 struct lltable *lltables; /* list of L3-L2 resolution tables */
173
174 struct label *if_label; /* interface MAC label */
175
176 /* these are only used by IPv6 */
177 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
178 void *if_afdata[AF_MAX];
179 int if_afdata_initialized;
180 struct mtx if_afdata_mtx;
181 struct task if_starttask; /* task for IFF_NEEDSGIANT */
182 struct task if_linktask; /* task for link change events */
183 struct mtx if_addr_mtx; /* mutex to protect address lists */
184 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */
185 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
186 /* protected by if_addr_mtx */
187 void *if_pf_kif;
188 void *if_lagg; /* lagg glue */
189 void *if_pspare[8]; /* multiq/TOE 3; vimage 3; general use 4 */
190 void (*if_qflush) /* flush any queues */
191 (struct ifnet *);
192 int (*if_transmit) /* initiate output routine */
193 (struct ifnet *, struct mbuf *);
194 int if_ispare[2]; /* general use 2 */
195};
196
197typedef void if_init_f_t(void *);
198
199/*
200 * XXX These aliases are terribly dangerous because they could apply
201 * to anything.
202 */
203#define if_mtu if_data.ifi_mtu
204#define if_type if_data.ifi_type
205#define if_physical if_data.ifi_physical
206#define if_addrlen if_data.ifi_addrlen
207#define if_hdrlen if_data.ifi_hdrlen
208#define if_metric if_data.ifi_metric
209#define if_link_state if_data.ifi_link_state
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_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL)
225
226/* for compatibility with other BSDs */
227#define if_addrlist if_addrhead
228#define if_list if_link
229#define if_name(ifp) ((ifp)->if_xname)
230
231/*
232 * Locks for address lists on the network interface.
233 */
234#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \
235 "if_addr_mtx", NULL, MTX_DEF)
236#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx)
237#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx)
238#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx)
239#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
240
241/*
242 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
243 * are queues of messages stored on ifqueue structures
244 * (defined above). Entries are added to and deleted from these structures
245 * by these macros, which should be called with ipl raised to splimp().
246 */
247#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx)
248#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx)
249#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
250#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
251#define _IF_DROP(ifq) ((ifq)->ifq_drops++)
252#define _IF_QLEN(ifq) ((ifq)->ifq_len)
253
254#define _IF_ENQUEUE(ifq, m) do { \
255 (m)->m_nextpkt = NULL; \
256 if ((ifq)->ifq_tail == NULL) \
257 (ifq)->ifq_head = m; \
258 else \
259 (ifq)->ifq_tail->m_nextpkt = m; \
260 (ifq)->ifq_tail = m; \
261 (ifq)->ifq_len++; \
262} while (0)
263
264#define IF_ENQUEUE(ifq, m) do { \
265 IF_LOCK(ifq); \
266 _IF_ENQUEUE(ifq, m); \
267 IF_UNLOCK(ifq); \
268} while (0)
269
270#define _IF_PREPEND(ifq, m) do { \
271 (m)->m_nextpkt = (ifq)->ifq_head; \
272 if ((ifq)->ifq_tail == NULL) \
273 (ifq)->ifq_tail = (m); \
274 (ifq)->ifq_head = (m); \
275 (ifq)->ifq_len++; \
276} while (0)
277
278#define IF_PREPEND(ifq, m) do { \
279 IF_LOCK(ifq); \
280 _IF_PREPEND(ifq, m); \
281 IF_UNLOCK(ifq); \
282} while (0)
283
284#define _IF_DEQUEUE(ifq, m) do { \
285 (m) = (ifq)->ifq_head; \
286 if (m) { \
287 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
288 (ifq)->ifq_tail = NULL; \
289 (m)->m_nextpkt = NULL; \
290 (ifq)->ifq_len--; \
291 } \
292} while (0)
293
294#define IF_DEQUEUE(ifq, m) do { \
295 IF_LOCK(ifq); \
296 _IF_DEQUEUE(ifq, m); \
297 IF_UNLOCK(ifq); \
298} while (0)
299
300#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
301#define IF_POLL(ifq, m) _IF_POLL(ifq, m)
302
303#define _IF_DRAIN(ifq) do { \
304 struct mbuf *m; \
305 for (;;) { \
306 _IF_DEQUEUE(ifq, m); \
307 if (m == NULL) \
308 break; \
309 m_freem(m); \
310 } \
311} while (0)
312
313#define IF_DRAIN(ifq) do { \
314 IF_LOCK(ifq); \
315 _IF_DRAIN(ifq); \
316 IF_UNLOCK(ifq); \
317} while(0)
318
319#ifdef _KERNEL
320/* interface address change event */
321typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
322EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
323/* new interface arrival event */
324typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
325EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
326/* interface departure event */
327typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
328EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
329
330/*
331 * interface groups
332 */
333struct ifg_group {
334 char ifg_group[IFNAMSIZ];
335 u_int ifg_refcnt;
336 void *ifg_pf_kif;
337 TAILQ_HEAD(, ifg_member) ifg_members;
338 TAILQ_ENTRY(ifg_group) ifg_next;
339};
340
341struct ifg_member {
342 TAILQ_ENTRY(ifg_member) ifgm_next;
343 struct ifnet *ifgm_ifp;
344};
345
346struct ifg_list {
347 struct ifg_group *ifgl_group;
348 TAILQ_ENTRY(ifg_list) ifgl_next;
349};
350
351/* group attach event */
352typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
353EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
354/* group detach event */
355typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
356EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
357/* group change event */
358typedef void (*group_change_event_handler_t)(void *, const char *);
359EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
360
361#define IF_AFDATA_LOCK_INIT(ifp) \
362 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF)
363#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx)
364#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx)
365#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx)
366#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx)
367
368#define IFF_LOCKGIANT(ifp) do { \
369 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
370 mtx_lock(&Giant); \
371} while (0)
372
373#define IFF_UNLOCKGIANT(ifp) do { \
374 if ((ifp)->if_flags & IFF_NEEDSGIANT) \
375 mtx_unlock(&Giant); \
376} while (0)
377
378int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
379 int adjust);
380#define IF_HANDOFF(ifq, m, ifp) \
381 if_handoff((struct ifqueue *)ifq, m, ifp, 0)
382#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \
383 if_handoff((struct ifqueue *)ifq, m, ifp, adj)
384
385void if_start(struct ifnet *);
386
387#define IFQ_ENQUEUE(ifq, m, err) \
388do { \
389 IF_LOCK(ifq); \
390 if (ALTQ_IS_ENABLED(ifq)) \
391 ALTQ_ENQUEUE(ifq, m, NULL, err); \
392 else { \
393 if (_IF_QFULL(ifq)) { \
394 m_freem(m); \
395 (err) = ENOBUFS; \
396 } else { \
397 _IF_ENQUEUE(ifq, m); \
398 (err) = 0; \
399 } \
400 } \
401 if (err) \
402 (ifq)->ifq_drops++; \
403 IF_UNLOCK(ifq); \
404} while (0)
405
406#define IFQ_DEQUEUE_NOLOCK(ifq, m) \
407do { \
408 if (TBR_IS_ENABLED(ifq)) \
409 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \
410 else if (ALTQ_IS_ENABLED(ifq)) \
411 ALTQ_DEQUEUE(ifq, m); \
412 else \
413 _IF_DEQUEUE(ifq, m); \
414} while (0)
415
416#define IFQ_DEQUEUE(ifq, m) \
417do { \
418 IF_LOCK(ifq); \
419 IFQ_DEQUEUE_NOLOCK(ifq, m); \
420 IF_UNLOCK(ifq); \
421} while (0)
422
423#define IFQ_POLL_NOLOCK(ifq, m) \
424do { \
425 if (TBR_IS_ENABLED(ifq)) \
426 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \
427 else if (ALTQ_IS_ENABLED(ifq)) \
428 ALTQ_POLL(ifq, m); \
429 else \
430 _IF_POLL(ifq, m); \
431} while (0)
432
433#define IFQ_POLL(ifq, m) \
434do { \
435 IF_LOCK(ifq); \
436 IFQ_POLL_NOLOCK(ifq, m); \
437 IF_UNLOCK(ifq); \
438} while (0)
439
440#define IFQ_PURGE_NOLOCK(ifq) \
441do { \
442 if (ALTQ_IS_ENABLED(ifq)) { \
443 ALTQ_PURGE(ifq); \
444 } else \
445 _IF_DRAIN(ifq); \
446} while (0)
447
448#define IFQ_PURGE(ifq) \
449do { \
450 IF_LOCK(ifq); \
451 IFQ_PURGE_NOLOCK(ifq); \
452 IF_UNLOCK(ifq); \
453} while (0)
454
455#define IFQ_SET_READY(ifq) \
456 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
457
458#define IFQ_LOCK(ifq) IF_LOCK(ifq)
459#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq)
460#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq)
461#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
462#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
463#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
464#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++)
465#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
466
467/*
468 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
469 * the handoff logic, as that flag is locked by the device driver.
470 */
471#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
472do { \
473 int len; \
474 short mflags; \
475 \
476 len = (m)->m_pkthdr.len; \
477 mflags = (m)->m_flags; \
478 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
479 if ((err) == 0) { \
480 (ifp)->if_obytes += len + (adj); \
481 if (mflags & M_MCAST) \
482 (ifp)->if_omcasts++; \
483 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \
484 if_start(ifp); \
485 } \
486} while (0)
487
488#define IFQ_HANDOFF(ifp, m, err) \
489 IFQ_HANDOFF_ADJ(ifp, m, 0, err)
490
491#define IFQ_DRV_DEQUEUE(ifq, m) \
492do { \
493 (m) = (ifq)->ifq_drv_head; \
494 if (m) { \
495 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
496 (ifq)->ifq_drv_tail = NULL; \
497 (m)->m_nextpkt = NULL; \
498 (ifq)->ifq_drv_len--; \
499 } else { \
500 IFQ_LOCK(ifq); \
501 IFQ_DEQUEUE_NOLOCK(ifq, m); \
502 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
503 struct mbuf *m0; \
504 IFQ_DEQUEUE_NOLOCK(ifq, m0); \
505 if (m0 == NULL) \
506 break; \
507 m0->m_nextpkt = NULL; \
508 if ((ifq)->ifq_drv_tail == NULL) \
509 (ifq)->ifq_drv_head = m0; \
510 else \
511 (ifq)->ifq_drv_tail->m_nextpkt = m0; \
512 (ifq)->ifq_drv_tail = m0; \
513 (ifq)->ifq_drv_len++; \
514 } \
515 IFQ_UNLOCK(ifq); \
516 } \
517} while (0)
518
519#define IFQ_DRV_PREPEND(ifq, m) \
520do { \
521 (m)->m_nextpkt = (ifq)->ifq_drv_head; \
522 if ((ifq)->ifq_drv_tail == NULL) \
523 (ifq)->ifq_drv_tail = (m); \
524 (ifq)->ifq_drv_head = (m); \
525 (ifq)->ifq_drv_len++; \
526} while (0)
527
528#define IFQ_DRV_IS_EMPTY(ifq) \
529 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
530
531#define IFQ_DRV_PURGE(ifq) \
532do { \
533 struct mbuf *m, *n = (ifq)->ifq_drv_head; \
534 while((m = n) != NULL) { \
535 n = m->m_nextpkt; \
536 m_freem(m); \
537 } \
538 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
539 (ifq)->ifq_drv_len = 0; \
540 IFQ_PURGE(ifq); \
541} while (0)
542
543/*
544 * 72 was chosen below because it is the size of a TCP/IP
545 * header (40) + the minimum mss (32).
546 */
547#define IF_MINMTU 72
548#define IF_MAXMTU 65535
549
550#endif /* _KERNEL */
551
552/*
553 * The ifaddr structure contains information about one address
554 * of an interface. They are maintained by the different address families,
555 * are allocated and attached when an address is set, and are linked
556 * together so all addresses for an interface can be located.
557 *
558 * NOTE: a 'struct ifaddr' is always at the beginning of a larger
559 * chunk of malloc'ed memory, where we store the three addresses
560 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
561 */
562struct ifaddr {
563 struct sockaddr *ifa_addr; /* address of interface */
564 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
565#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
566 struct sockaddr *ifa_netmask; /* used to determine subnet */
567 struct if_data if_data; /* not all members are meaningful */
568 struct ifnet *ifa_ifp; /* back-pointer to interface */
569 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
570 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
571 (int, struct rtentry *, struct rt_addrinfo *);
572 u_short ifa_flags; /* mostly rt_flags for cloning */
573 u_int ifa_refcnt; /* references to this structure */
574 int ifa_metric; /* cost of going out this interface */
575 int (*ifa_claim_addr) /* check if an addr goes to this if */
576 (struct ifaddr *, struct sockaddr *);
577 struct mtx ifa_mtx;
578};
579#define IFA_ROUTE RTF_UP /* route installed */
580
581/* for compatibility with other BSDs */
582#define ifa_list ifa_link
583
584#define IFA_LOCK_INIT(ifa) \
585 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF)
586#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx)
587#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx)
588#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx)
589
590/*
591 * The prefix structure contains information about one prefix
592 * of an interface. They are maintained by the different address families,
593 * are allocated and attached when a prefix or an address is set,
594 * and are linked together so all prefixes for an interface can be located.
595 */
596struct ifprefix {
597 struct sockaddr *ifpr_prefix; /* prefix of interface */
598 struct ifnet *ifpr_ifp; /* back-pointer to interface */
599 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
600 u_char ifpr_plen; /* prefix length in bits */
601 u_char ifpr_type; /* protocol dependent prefix type */
602};
603
604/*
605 * Multicast address structure. This is analogous to the ifaddr
606 * structure except that it keeps track of multicast addresses.
607 */
608struct ifmultiaddr {
609 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
610 struct sockaddr *ifma_addr; /* address this membership is for */
611 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
612 struct ifnet *ifma_ifp; /* back-pointer to interface */
613 u_int ifma_refcount; /* reference count */
614 void *ifma_protospec; /* protocol-specific state, if any */
615 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
616};
617
618#ifdef _KERNEL
619#define IFAFREE(ifa) \
620 do { \
621 IFA_LOCK(ifa); \
622 KASSERT((ifa)->ifa_refcnt > 0, \
623 ("ifa %p !(ifa_refcnt > 0)", ifa)); \
624 if (--(ifa)->ifa_refcnt == 0) { \
625 IFA_DESTROY(ifa); \
626 free(ifa, M_IFADDR); \
627 } else \
628 IFA_UNLOCK(ifa); \
629 } while (0)
630
631#define IFAREF(ifa) \
632 do { \
633 IFA_LOCK(ifa); \
634 ++(ifa)->ifa_refcnt; \
635 IFA_UNLOCK(ifa); \
636 } while (0)
637
638extern struct mtx ifnet_lock;
639#define IFNET_LOCK_INIT() \
640 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE)
641#define IFNET_WLOCK() mtx_lock(&ifnet_lock)
642#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock)
643#define IFNET_WLOCK_ASSERT() mtx_assert(&ifnet_lock, MA_OWNED)
644#define IFNET_RLOCK() IFNET_WLOCK()
645#define IFNET_RUNLOCK() IFNET_WUNLOCK()
646
647struct ifindex_entry {
648 struct ifnet *ife_ifnet;
649 struct cdev *ife_dev;
650};
651
652struct ifnet *ifnet_byindex(u_short idx);
653
654/*
655 * Given the index, ifaddr_byindex() returns the one and only
656 * link-level ifaddr for the interface. You are not supposed to use
657 * it to traverse the list of addresses associated to the interface.
658 */
659struct ifaddr *ifaddr_byindex(u_short idx);
660struct cdev *ifdev_byindex(u_short idx);
661
662extern struct ifnethead ifnet;
663extern int ifqmaxlen;
664extern struct ifnet *loif; /* first loopback interface */
665extern int if_index;
666
667int if_addgroup(struct ifnet *, const char *);
668int if_delgroup(struct ifnet *, const char *);
669int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
670int if_allmulti(struct ifnet *, int);
671struct ifnet* if_alloc(u_char);
672void if_attach(struct ifnet *);
673int if_delmulti(struct ifnet *, struct sockaddr *);
674void if_delmulti_ifma(struct ifmultiaddr *);
675void if_detach(struct ifnet *);
676void if_purgeaddrs(struct ifnet *);
677void if_purgemaddrs(struct ifnet *);
678void if_down(struct ifnet *);
679struct ifmultiaddr *
680 if_findmulti(struct ifnet *, struct sockaddr *);
681void if_free(struct ifnet *);
682void if_free_type(struct ifnet *, u_char);
683void if_initname(struct ifnet *, const char *, int);
684void if_link_state_change(struct ifnet *, int);
685int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
686int if_setlladdr(struct ifnet *, const u_char *, int);
687void if_up(struct ifnet *);
688/*void ifinit(void);*/ /* declared in systm.h for main() */
689int ifioctl(struct socket *, u_long, caddr_t, struct thread *);
690int ifpromisc(struct ifnet *, int);
691struct ifnet *ifunit(const char *);
692
693void ifq_attach(struct ifaltq *, struct ifnet *ifp);
694void ifq_detach(struct ifaltq *);
695
696struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
697struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
698struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
699struct ifaddr *ifa_ifwithnet(struct sockaddr *);
700struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
701struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
702
703struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
704
705int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
706
707typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
708typedef void if_com_free_t(void *com, u_char type);
709void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
710void if_deregister_com_alloc(u_char type);
711
712#define IF_LLADDR(ifp) \
713 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
714
715#ifdef DEVICE_POLLING
716enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
717
718typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
719int ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
720int ether_poll_deregister(struct ifnet *ifp);
721#endif /* DEVICE_POLLING */
722
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