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1 /*-
2  * Copyright (c) 1982, 1986, 1989, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 4. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
30  * $FreeBSD$
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  */
65 struct  mbuf;
66 struct  thread;
67 struct  rtentry;
68 struct  rt_addrinfo;
69 struct  socket;
70 struct  ether_header;
71 struct  carp_if;
72 struct  ifvlantrunk;
73 struct  route;
74 struct  vnet;
75 #endif
76
77 #include <sys/queue.h>          /* get TAILQ macros */
78
79 #ifdef _KERNEL
80 #include <sys/mbuf.h>
81 #include <sys/eventhandler.h>
82 #include <sys/buf_ring.h>
83 #include <net/vnet.h>
84 #endif /* _KERNEL */
85 #include <sys/lock.h>           /* XXX */
86 #include <sys/mutex.h>          /* XXX */
87 #include <sys/rwlock.h>         /* XXX */
88 #include <sys/sx.h>             /* XXX */
89 #include <sys/event.h>          /* XXX */
90 #include <sys/_task.h>
91
92 #define IF_DUNIT_NONE   -1
93
94 #include <altq/if_altq.h>
95
96 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
97 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
98 TAILQ_HEAD(ifprefixhead, ifprefix);
99 TAILQ_HEAD(ifmultihead, ifmultiaddr);
100 TAILQ_HEAD(ifgrouphead, ifg_group);
101
102 /*
103  * Structure defining a queue for a network interface.
104  */
105 struct  ifqueue {
106         struct  mbuf *ifq_head;
107         struct  mbuf *ifq_tail;
108         int     ifq_len;
109         int     ifq_maxlen;
110         int     ifq_drops;
111         struct  mtx ifq_mtx;
112 };
113
114 /*
115  * Structure defining a network interface.
116  *
117  * (Would like to call this struct ``if'', but C isn't PL/1.)
118  */
119
120 struct ifnet {
121         void    *if_softc;              /* pointer to driver state */
122         void    *if_l2com;              /* pointer to protocol bits */
123         struct vnet *if_vnet;           /* pointer to network stack instance */
124         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
125         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
126         const char *if_dname;           /* driver name */
127         int     if_dunit;               /* unit or IF_DUNIT_NONE */
128         u_int   if_refcount;            /* reference count */
129         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
130                 /*
131                  * if_addrhead is the list of all addresses associated to
132                  * an interface.
133                  * Some code in the kernel assumes that first element
134                  * of the list has type AF_LINK, and contains sockaddr_dl
135                  * addresses which store the link-level address and the name
136                  * of the interface.
137                  * However, access to the AF_LINK address through this
138                  * field is deprecated. Use if_addr or ifaddr_byindex() instead.
139                  */
140         int     if_pcount;              /* number of promiscuous listeners */
141         struct  carp_if *if_carp;       /* carp interface structure */
142         struct  bpf_if *if_bpf;         /* packet filter structure */
143         u_short if_index;               /* numeric abbreviation for this if  */
144         short   if_index_reserved;      /* spare space to grow if_index */
145         struct  ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
146         int     if_flags;               /* up/down, broadcast, etc. */
147         int     if_capabilities;        /* interface features & capabilities */
148         int     if_capenable;           /* enabled features & capabilities */
149         void    *if_linkmib;            /* link-type-specific MIB data */
150         size_t  if_linkmiblen;          /* length of above data */
151         struct  if_data if_data;
152         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
153         int     if_amcount;             /* number of all-multicast requests */
154 /* procedure handles */
155         int     (*if_output)            /* output routine (enqueue) */
156                 (struct ifnet *, struct mbuf *, struct sockaddr *,
157                      struct route *);
158         void    (*if_input)             /* input routine (from h/w driver) */
159                 (struct ifnet *, struct mbuf *);
160         void    (*if_start)             /* initiate output routine */
161                 (struct ifnet *);
162         int     (*if_ioctl)             /* ioctl routine */
163                 (struct ifnet *, u_long, caddr_t);
164         void    (*if_init)              /* Init routine */
165                 (void *);
166         int     (*if_resolvemulti)      /* validate/resolve multicast */
167                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
168         void    (*if_qflush)            /* flush any queues */
169                 (struct ifnet *);
170         int     (*if_transmit)          /* initiate output routine */
171                 (struct ifnet *, struct mbuf *);
172         void    (*if_reassign)          /* reassign to vnet routine */
173                 (struct ifnet *, struct vnet *, char *);
174         struct  vnet *if_home_vnet;     /* where this ifnet originates from */
175         struct  ifaddr  *if_addr;       /* pointer to link-level address */
176         void    *if_llsoftc;            /* link layer softc */
177         int     if_drv_flags;           /* driver-managed status flags */
178         struct  ifaltq if_snd;          /* output queue (includes altq) */
179         const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
180
181         void    *if_bridge;             /* bridge glue */
182
183         struct  label *if_label;        /* interface MAC label */
184
185         /* these are only used by IPv6 */
186         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
187         void    *if_afdata[AF_MAX];
188         int     if_afdata_initialized;
189         struct  rwlock if_afdata_lock;
190         struct  task if_linktask;       /* task for link change events */
191         struct  mtx if_addr_mtx;        /* mutex to protect address lists */
192
193         LIST_ENTRY(ifnet) if_clones;    /* interfaces of a cloner */
194         TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
195                                         /* protected by if_addr_mtx */
196         void    *if_pf_kif;
197         void    *if_lagg;               /* lagg glue */
198         char    *if_description;        /* interface description */
199         u_int   if_fib;                 /* interface FIB */
200         u_char  if_alloctype;           /* if_type at time of allocation */
201
202         /*
203          * Spare fields are added so that we can modify sensitive data
204          * structures without changing the kernel binary interface, and must
205          * be used with care where binary compatibility is required.
206          */
207         char    if_cspare[3];
208         u_int   if_hw_tsomax;           /* tso burst length limit, the minmum
209                                          * is (IP_MAXPACKET / 8).
210                                          * XXXAO: Have to find a better place
211                                          * for it eventually. */
212         int     if_ispare[3];
213         void    *if_pspare[8];          /* 1 netmap, 7 TDB */
214 };
215
216 typedef void if_init_f_t(void *);
217
218 /*
219  * XXX These aliases are terribly dangerous because they could apply
220  * to anything.
221  */
222 #define if_mtu          if_data.ifi_mtu
223 #define if_type         if_data.ifi_type
224 #define if_physical     if_data.ifi_physical
225 #define if_addrlen      if_data.ifi_addrlen
226 #define if_hdrlen       if_data.ifi_hdrlen
227 #define if_metric       if_data.ifi_metric
228 #define if_link_state   if_data.ifi_link_state
229 #define if_baudrate     if_data.ifi_baudrate
230 #define if_hwassist     if_data.ifi_hwassist
231 #define if_ipackets     if_data.ifi_ipackets
232 #define if_ierrors      if_data.ifi_ierrors
233 #define if_opackets     if_data.ifi_opackets
234 #define if_oerrors      if_data.ifi_oerrors
235 #define if_collisions   if_data.ifi_collisions
236 #define if_ibytes       if_data.ifi_ibytes
237 #define if_obytes       if_data.ifi_obytes
238 #define if_imcasts      if_data.ifi_imcasts
239 #define if_omcasts      if_data.ifi_omcasts
240 #define if_iqdrops      if_data.ifi_iqdrops
241 #define if_noproto      if_data.ifi_noproto
242 #define if_lastchange   if_data.ifi_lastchange
243
244 /* for compatibility with other BSDs */
245 #define if_addrlist     if_addrhead
246 #define if_list         if_link
247 #define if_name(ifp)    ((ifp)->if_xname)
248
249 /*
250  * Locks for address lists on the network interface.
251  */
252 #define IF_ADDR_LOCK_INIT(if)   mtx_init(&(if)->if_addr_mtx,            \
253                                     "if_addr_mtx", NULL, MTX_DEF)
254 #define IF_ADDR_LOCK_DESTROY(if)        mtx_destroy(&(if)->if_addr_mtx)
255 #define IF_ADDR_WLOCK(if)       mtx_lock(&(if)->if_addr_mtx)
256 #define IF_ADDR_WUNLOCK(if)     mtx_unlock(&(if)->if_addr_mtx)
257 #define IF_ADDR_RLOCK(if)       mtx_lock(&(if)->if_addr_mtx)
258 #define IF_ADDR_RUNLOCK(if)     mtx_unlock(&(if)->if_addr_mtx)
259 #define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
260 #define IF_ADDR_WLOCK_ASSERT(if)        mtx_assert(&(if)->if_addr_mtx, MA_OWNED)
261 /* XXX: Compat. */
262 #define IF_ADDR_LOCK(if)        IF_ADDR_WLOCK(if)
263 #define IF_ADDR_UNLOCK(if)      IF_ADDR_WUNLOCK(if)
264
265 /*
266  * Function variations on locking macros intended to be used by loadable
267  * kernel modules in order to divorce them from the internals of address list
268  * locking.
269  */
270 void    if_addr_rlock(struct ifnet *ifp);       /* if_addrhead */
271 void    if_addr_runlock(struct ifnet *ifp);     /* if_addrhead */
272 void    if_maddr_rlock(struct ifnet *ifp);      /* if_multiaddrs */
273 void    if_maddr_runlock(struct ifnet *ifp);    /* if_multiaddrs */
274
275 /*
276  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
277  * are queues of messages stored on ifqueue structures
278  * (defined above).  Entries are added to and deleted from these structures
279  * by these macros, which should be called with ipl raised to splimp().
280  */
281 #define IF_LOCK(ifq)            mtx_lock(&(ifq)->ifq_mtx)
282 #define IF_UNLOCK(ifq)          mtx_unlock(&(ifq)->ifq_mtx)
283 #define IF_LOCK_ASSERT(ifq)     mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
284 #define _IF_QFULL(ifq)          ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
285 #define _IF_DROP(ifq)           ((ifq)->ifq_drops++)
286 #define _IF_QLEN(ifq)           ((ifq)->ifq_len)
287
288 #define _IF_ENQUEUE(ifq, m) do {                                \
289         (m)->m_nextpkt = NULL;                                  \
290         if ((ifq)->ifq_tail == NULL)                            \
291                 (ifq)->ifq_head = m;                            \
292         else                                                    \
293                 (ifq)->ifq_tail->m_nextpkt = m;                 \
294         (ifq)->ifq_tail = m;                                    \
295         (ifq)->ifq_len++;                                       \
296 } while (0)
297
298 #define IF_ENQUEUE(ifq, m) do {                                 \
299         IF_LOCK(ifq);                                           \
300         _IF_ENQUEUE(ifq, m);                                    \
301         IF_UNLOCK(ifq);                                         \
302 } while (0)
303
304 #define _IF_PREPEND(ifq, m) do {                                \
305         (m)->m_nextpkt = (ifq)->ifq_head;                       \
306         if ((ifq)->ifq_tail == NULL)                            \
307                 (ifq)->ifq_tail = (m);                          \
308         (ifq)->ifq_head = (m);                                  \
309         (ifq)->ifq_len++;                                       \
310 } while (0)
311
312 #define IF_PREPEND(ifq, m) do {                                 \
313         IF_LOCK(ifq);                                           \
314         _IF_PREPEND(ifq, m);                                    \
315         IF_UNLOCK(ifq);                                         \
316 } while (0)
317
318 #define _IF_DEQUEUE(ifq, m) do {                                \
319         (m) = (ifq)->ifq_head;                                  \
320         if (m) {                                                \
321                 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
322                         (ifq)->ifq_tail = NULL;                 \
323                 (m)->m_nextpkt = NULL;                          \
324                 (ifq)->ifq_len--;                               \
325         }                                                       \
326 } while (0)
327
328 #define IF_DEQUEUE(ifq, m) do {                                 \
329         IF_LOCK(ifq);                                           \
330         _IF_DEQUEUE(ifq, m);                                    \
331         IF_UNLOCK(ifq);                                         \
332 } while (0)
333
334 #define _IF_DEQUEUE_ALL(ifq, m) do {                            \
335         (m) = (ifq)->ifq_head;                                  \
336         (ifq)->ifq_head = (ifq)->ifq_tail = NULL;               \
337         (ifq)->ifq_len = 0;                                     \
338 } while (0)
339
340 #define IF_DEQUEUE_ALL(ifq, m) do {                             \
341         IF_LOCK(ifq);                                           \
342         _IF_DEQUEUE_ALL(ifq, m);                                \
343         IF_UNLOCK(ifq);                                         \
344 } while (0)
345
346 #define _IF_POLL(ifq, m)        ((m) = (ifq)->ifq_head)
347 #define IF_POLL(ifq, m)         _IF_POLL(ifq, m)
348
349 #define _IF_DRAIN(ifq) do {                                     \
350         struct mbuf *m;                                         \
351         for (;;) {                                              \
352                 _IF_DEQUEUE(ifq, m);                            \
353                 if (m == NULL)                                  \
354                         break;                                  \
355                 m_freem(m);                                     \
356         }                                                       \
357 } while (0)
358
359 #define IF_DRAIN(ifq) do {                                      \
360         IF_LOCK(ifq);                                           \
361         _IF_DRAIN(ifq);                                         \
362         IF_UNLOCK(ifq);                                         \
363 } while(0)
364
365 #ifdef _KERNEL
366 /* interface link layer address change event */
367 typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
368 EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
369 /* interface address change event */
370 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
371 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
372 /* new interface arrival event */
373 typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
374 EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
375 /* interface departure event */
376 typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
377 EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
378 /* Interface link state change event */
379 typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
380 EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
381
382 /*
383  * interface groups
384  */
385 struct ifg_group {
386         char                             ifg_group[IFNAMSIZ];
387         u_int                            ifg_refcnt;
388         void                            *ifg_pf_kif;
389         TAILQ_HEAD(, ifg_member)         ifg_members;
390         TAILQ_ENTRY(ifg_group)           ifg_next;
391 };
392
393 struct ifg_member {
394         TAILQ_ENTRY(ifg_member)  ifgm_next;
395         struct ifnet            *ifgm_ifp;
396 };
397
398 struct ifg_list {
399         struct ifg_group        *ifgl_group;
400         TAILQ_ENTRY(ifg_list)    ifgl_next;
401 };
402
403 /* group attach event */
404 typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
405 EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
406 /* group detach event */
407 typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
408 EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
409 /* group change event */
410 typedef void (*group_change_event_handler_t)(void *, const char *);
411 EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
412
413 #define IF_AFDATA_LOCK_INIT(ifp)        \
414         rw_init(&(ifp)->if_afdata_lock, "if_afdata")
415
416 #define IF_AFDATA_WLOCK(ifp)    rw_wlock(&(ifp)->if_afdata_lock)
417 #define IF_AFDATA_RLOCK(ifp)    rw_rlock(&(ifp)->if_afdata_lock)
418 #define IF_AFDATA_WUNLOCK(ifp)  rw_wunlock(&(ifp)->if_afdata_lock)
419 #define IF_AFDATA_RUNLOCK(ifp)  rw_runlock(&(ifp)->if_afdata_lock)
420 #define IF_AFDATA_LOCK(ifp)     IF_AFDATA_WLOCK(ifp)
421 #define IF_AFDATA_UNLOCK(ifp)   IF_AFDATA_WUNLOCK(ifp)
422 #define IF_AFDATA_TRYLOCK(ifp)  rw_try_wlock(&(ifp)->if_afdata_lock)
423 #define IF_AFDATA_DESTROY(ifp)  rw_destroy(&(ifp)->if_afdata_lock)
424
425 #define IF_AFDATA_LOCK_ASSERT(ifp)      rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED)
426 #define IF_AFDATA_RLOCK_ASSERT(ifp)     rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED)
427 #define IF_AFDATA_WLOCK_ASSERT(ifp)     rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED)
428 #define IF_AFDATA_UNLOCK_ASSERT(ifp)    rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED)
429
430 int     if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
431             int adjust);
432 #define IF_HANDOFF(ifq, m, ifp)                 \
433         if_handoff((struct ifqueue *)ifq, m, ifp, 0)
434 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        \
435         if_handoff((struct ifqueue *)ifq, m, ifp, adj)
436
437 void    if_start(struct ifnet *);
438
439 #define IFQ_ENQUEUE(ifq, m, err)                                        \
440 do {                                                                    \
441         IF_LOCK(ifq);                                                   \
442         if (ALTQ_IS_ENABLED(ifq))                                       \
443                 ALTQ_ENQUEUE(ifq, m, NULL, err);                        \
444         else {                                                          \
445                 if (_IF_QFULL(ifq)) {                                   \
446                         m_freem(m);                                     \
447                         (err) = ENOBUFS;                                \
448                 } else {                                                \
449                         _IF_ENQUEUE(ifq, m);                            \
450                         (err) = 0;                                      \
451                 }                                                       \
452         }                                                               \
453         if (err)                                                        \
454                 (ifq)->ifq_drops++;                                     \
455         IF_UNLOCK(ifq);                                                 \
456 } while (0)
457
458 #define IFQ_DEQUEUE_NOLOCK(ifq, m)                                      \
459 do {                                                                    \
460         if (TBR_IS_ENABLED(ifq))                                        \
461                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE);               \
462         else if (ALTQ_IS_ENABLED(ifq))                                  \
463                 ALTQ_DEQUEUE(ifq, m);                                   \
464         else                                                            \
465                 _IF_DEQUEUE(ifq, m);                                    \
466 } while (0)
467
468 #define IFQ_DEQUEUE(ifq, m)                                             \
469 do {                                                                    \
470         IF_LOCK(ifq);                                                   \
471         IFQ_DEQUEUE_NOLOCK(ifq, m);                                     \
472         IF_UNLOCK(ifq);                                                 \
473 } while (0)
474
475 #define IFQ_POLL_NOLOCK(ifq, m)                                         \
476 do {                                                                    \
477         if (TBR_IS_ENABLED(ifq))                                        \
478                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL);                 \
479         else if (ALTQ_IS_ENABLED(ifq))                                  \
480                 ALTQ_POLL(ifq, m);                                      \
481         else                                                            \
482                 _IF_POLL(ifq, m);                                       \
483 } while (0)
484
485 #define IFQ_POLL(ifq, m)                                                \
486 do {                                                                    \
487         IF_LOCK(ifq);                                                   \
488         IFQ_POLL_NOLOCK(ifq, m);                                        \
489         IF_UNLOCK(ifq);                                                 \
490 } while (0)
491
492 #define IFQ_PURGE_NOLOCK(ifq)                                           \
493 do {                                                                    \
494         if (ALTQ_IS_ENABLED(ifq)) {                                     \
495                 ALTQ_PURGE(ifq);                                        \
496         } else                                                          \
497                 _IF_DRAIN(ifq);                                         \
498 } while (0)
499
500 #define IFQ_PURGE(ifq)                                                  \
501 do {                                                                    \
502         IF_LOCK(ifq);                                                   \
503         IFQ_PURGE_NOLOCK(ifq);                                          \
504         IF_UNLOCK(ifq);                                                 \
505 } while (0)
506
507 #define IFQ_SET_READY(ifq)                                              \
508         do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
509
510 #define IFQ_LOCK(ifq)                   IF_LOCK(ifq)
511 #define IFQ_UNLOCK(ifq)                 IF_UNLOCK(ifq)
512 #define IFQ_LOCK_ASSERT(ifq)            IF_LOCK_ASSERT(ifq)
513 #define IFQ_IS_EMPTY(ifq)               ((ifq)->ifq_len == 0)
514 #define IFQ_INC_LEN(ifq)                ((ifq)->ifq_len++)
515 #define IFQ_DEC_LEN(ifq)                (--(ifq)->ifq_len)
516 #define IFQ_INC_DROPS(ifq)              ((ifq)->ifq_drops++)
517 #define IFQ_SET_MAXLEN(ifq, len)        ((ifq)->ifq_maxlen = (len))
518
519 /*
520  * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
521  * the handoff logic, as that flag is locked by the device driver.
522  */
523 #define IFQ_HANDOFF_ADJ(ifp, m, adj, err)                               \
524 do {                                                                    \
525         int len;                                                        \
526         short mflags;                                                   \
527                                                                         \
528         len = (m)->m_pkthdr.len;                                        \
529         mflags = (m)->m_flags;                                          \
530         IFQ_ENQUEUE(&(ifp)->if_snd, m, err);                            \
531         if ((err) == 0) {                                               \
532                 (ifp)->if_obytes += len + (adj);                        \
533                 if (mflags & M_MCAST)                                   \
534                         (ifp)->if_omcasts++;                            \
535                 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0)       \
536                         if_start(ifp);                                  \
537         }                                                               \
538 } while (0)
539
540 #define IFQ_HANDOFF(ifp, m, err)                                        \
541         IFQ_HANDOFF_ADJ(ifp, m, 0, err)
542
543 #define IFQ_DRV_DEQUEUE(ifq, m)                                         \
544 do {                                                                    \
545         (m) = (ifq)->ifq_drv_head;                                      \
546         if (m) {                                                        \
547                 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL)     \
548                         (ifq)->ifq_drv_tail = NULL;                     \
549                 (m)->m_nextpkt = NULL;                                  \
550                 (ifq)->ifq_drv_len--;                                   \
551         } else {                                                        \
552                 IFQ_LOCK(ifq);                                          \
553                 IFQ_DEQUEUE_NOLOCK(ifq, m);                             \
554                 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) {    \
555                         struct mbuf *m0;                                \
556                         IFQ_DEQUEUE_NOLOCK(ifq, m0);                    \
557                         if (m0 == NULL)                                 \
558                                 break;                                  \
559                         m0->m_nextpkt = NULL;                           \
560                         if ((ifq)->ifq_drv_tail == NULL)                \
561                                 (ifq)->ifq_drv_head = m0;               \
562                         else                                            \
563                                 (ifq)->ifq_drv_tail->m_nextpkt = m0;    \
564                         (ifq)->ifq_drv_tail = m0;                       \
565                         (ifq)->ifq_drv_len++;                           \
566                 }                                                       \
567                 IFQ_UNLOCK(ifq);                                        \
568         }                                                               \
569 } while (0)
570
571 #define IFQ_DRV_PREPEND(ifq, m)                                         \
572 do {                                                                    \
573         (m)->m_nextpkt = (ifq)->ifq_drv_head;                           \
574         if ((ifq)->ifq_drv_tail == NULL)                                \
575                 (ifq)->ifq_drv_tail = (m);                              \
576         (ifq)->ifq_drv_head = (m);                                      \
577         (ifq)->ifq_drv_len++;                                           \
578 } while (0)
579
580 #define IFQ_DRV_IS_EMPTY(ifq)                                           \
581         (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
582
583 #define IFQ_DRV_PURGE(ifq)                                              \
584 do {                                                                    \
585         struct mbuf *m, *n = (ifq)->ifq_drv_head;                       \
586         while((m = n) != NULL) {                                        \
587                 n = m->m_nextpkt;                                       \
588                 m_freem(m);                                             \
589         }                                                               \
590         (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL;               \
591         (ifq)->ifq_drv_len = 0;                                         \
592         IFQ_PURGE(ifq);                                                 \
593 } while (0)
594
595 #ifdef _KERNEL
596 static __inline int
597 drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m)
598 {       
599         int error = 0;
600
601 #ifdef ALTQ
602         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
603                 IFQ_ENQUEUE(&ifp->if_snd, m, error);
604                 return (error);
605         }
606 #endif
607         error = buf_ring_enqueue(br, m);
608         if (error)
609                 m_freem(m);
610
611         return (error);
612 }
613
614 static __inline void
615 drbr_putback(struct ifnet *ifp, struct buf_ring *br, struct mbuf *new)
616 {
617         /*
618          * The top of the list needs to be swapped 
619          * for this one.
620          */
621 #ifdef ALTQ
622         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
623                 /* 
624                  * Peek in altq case dequeued it
625                  * so put it back.
626                  */
627                 IFQ_DRV_PREPEND(&ifp->if_snd, new);
628                 return;
629         }
630 #endif
631         buf_ring_putback_sc(br, new);
632 }
633
634 static __inline struct mbuf *
635 drbr_peek(struct ifnet *ifp, struct buf_ring *br)
636 {
637 #ifdef ALTQ
638         struct mbuf *m;
639         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
640                 /* 
641                  * Pull it off like a dequeue
642                  * since drbr_advance() does nothing
643                  * for altq and drbr_putback() will
644                  * use the old prepend function.
645                  */
646                 IFQ_DEQUEUE(&ifp->if_snd, m);
647                 return (m);
648         }
649 #endif
650         return(buf_ring_peek(br));
651 }
652
653 static __inline void
654 drbr_flush(struct ifnet *ifp, struct buf_ring *br)
655 {
656         struct mbuf *m;
657
658 #ifdef ALTQ
659         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
660                 IFQ_PURGE(&ifp->if_snd);
661 #endif  
662         while ((m = buf_ring_dequeue_sc(br)) != NULL)
663                 m_freem(m);
664 }
665
666 static __inline void
667 drbr_free(struct buf_ring *br, struct malloc_type *type)
668 {
669
670         drbr_flush(NULL, br);
671         buf_ring_free(br, type);
672 }
673
674 static __inline struct mbuf *
675 drbr_dequeue(struct ifnet *ifp, struct buf_ring *br)
676 {
677 #ifdef ALTQ
678         struct mbuf *m;
679
680         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {     
681                 IFQ_DEQUEUE(&ifp->if_snd, m);
682                 return (m);
683         }
684 #endif
685         return (buf_ring_dequeue_sc(br));
686 }
687
688 static __inline void
689 drbr_advance(struct ifnet *ifp, struct buf_ring *br)
690 {
691 #ifdef ALTQ
692         /* Nothing to do here since peek dequeues in altq case */
693         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
694                 return;
695 #endif
696         return (buf_ring_advance_sc(br));
697 }
698
699
700 static __inline struct mbuf *
701 drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br,
702     int (*func) (struct mbuf *, void *), void *arg) 
703 {
704         struct mbuf *m;
705 #ifdef ALTQ
706         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
707                 IFQ_LOCK(&ifp->if_snd);
708                 IFQ_POLL_NOLOCK(&ifp->if_snd, m);
709                 if (m != NULL && func(m, arg) == 0) {
710                         IFQ_UNLOCK(&ifp->if_snd);
711                         return (NULL);
712                 }
713                 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
714                 IFQ_UNLOCK(&ifp->if_snd);
715                 return (m);
716         }
717 #endif
718         m = buf_ring_peek(br);
719         if (m == NULL || func(m, arg) == 0)
720                 return (NULL);
721
722         return (buf_ring_dequeue_sc(br));
723 }
724
725 static __inline int
726 drbr_empty(struct ifnet *ifp, struct buf_ring *br)
727 {
728 #ifdef ALTQ
729         if (ALTQ_IS_ENABLED(&ifp->if_snd))
730                 return (IFQ_IS_EMPTY(&ifp->if_snd));
731 #endif
732         return (buf_ring_empty(br));
733 }
734
735 static __inline int
736 drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br)
737 {
738 #ifdef ALTQ
739         if (ALTQ_IS_ENABLED(&ifp->if_snd))
740                 return (1);
741 #endif
742         return (!buf_ring_empty(br));
743 }
744
745 static __inline int
746 drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
747 {
748 #ifdef ALTQ
749         if (ALTQ_IS_ENABLED(&ifp->if_snd))
750                 return (ifp->if_snd.ifq_len);
751 #endif
752         return (buf_ring_count(br));
753 }
754 #endif
755 /*
756  * 72 was chosen below because it is the size of a TCP/IP
757  * header (40) + the minimum mss (32).
758  */
759 #define IF_MINMTU       72
760 #define IF_MAXMTU       65535
761
762 #define TOEDEV(ifp)     ((ifp)->if_llsoftc)
763
764 #endif /* _KERNEL */
765
766 /*
767  * The ifaddr structure contains information about one address
768  * of an interface.  They are maintained by the different address families,
769  * are allocated and attached when an address is set, and are linked
770  * together so all addresses for an interface can be located.
771  *
772  * NOTE: a 'struct ifaddr' is always at the beginning of a larger
773  * chunk of malloc'ed memory, where we store the three addresses
774  * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
775  */
776 struct ifaddr {
777         struct  sockaddr *ifa_addr;     /* address of interface */
778         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
779 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
780         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
781         struct  if_data if_data;        /* not all members are meaningful */
782         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
783         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
784         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
785                 (int, struct rtentry *, struct rt_addrinfo *);
786         u_short ifa_flags;              /* mostly rt_flags for cloning */
787         u_int   ifa_refcnt;             /* references to this structure */
788         int     ifa_metric;             /* cost of going out this interface */
789         int (*ifa_claim_addr)           /* check if an addr goes to this if */
790                 (struct ifaddr *, struct sockaddr *);
791         struct mtx ifa_mtx;
792 };
793 #define IFA_ROUTE       RTF_UP          /* route installed */
794 #define IFA_RTSELF      RTF_HOST        /* loopback route to self installed */
795
796 /* for compatibility with other BSDs */
797 #define ifa_list        ifa_link
798
799 #ifdef _KERNEL
800 #define IFA_LOCK(ifa)           mtx_lock(&(ifa)->ifa_mtx)
801 #define IFA_UNLOCK(ifa)         mtx_unlock(&(ifa)->ifa_mtx)
802
803 void    ifa_free(struct ifaddr *ifa);
804 void    ifa_init(struct ifaddr *ifa);
805 void    ifa_ref(struct ifaddr *ifa);
806 #endif
807
808 /*
809  * The prefix structure contains information about one prefix
810  * of an interface.  They are maintained by the different address families,
811  * are allocated and attached when a prefix or an address is set,
812  * and are linked together so all prefixes for an interface can be located.
813  */
814 struct ifprefix {
815         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
816         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
817         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
818         u_char  ifpr_plen;              /* prefix length in bits */
819         u_char  ifpr_type;              /* protocol dependent prefix type */
820 };
821
822 /*
823  * Multicast address structure.  This is analogous to the ifaddr
824  * structure except that it keeps track of multicast addresses.
825  */
826 struct ifmultiaddr {
827         TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
828         struct  sockaddr *ifma_addr;    /* address this membership is for */
829         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
830         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
831         u_int   ifma_refcount;          /* reference count */
832         void    *ifma_protospec;        /* protocol-specific state, if any */
833         struct  ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
834 };
835
836 #ifdef _KERNEL
837
838 extern  struct rwlock ifnet_rwlock;
839 extern  struct sx ifnet_sxlock;
840
841 #define IFNET_LOCK_INIT() do {                                          \
842         rw_init_flags(&ifnet_rwlock, "ifnet_rw",  RW_RECURSE);          \
843         sx_init_flags(&ifnet_sxlock, "ifnet_sx",  SX_RECURSE);          \
844 } while(0)
845
846 #define IFNET_WLOCK() do {                                              \
847         sx_xlock(&ifnet_sxlock);                                        \
848         rw_wlock(&ifnet_rwlock);                                        \
849 } while (0)
850
851 #define IFNET_WUNLOCK() do {                                            \
852         rw_wunlock(&ifnet_rwlock);                                      \
853         sx_xunlock(&ifnet_sxlock);                                      \
854 } while (0)
855
856 /*
857  * To assert the ifnet lock, you must know not only whether it's for read or
858  * write, but also whether it was acquired with sleep support or not.
859  */
860 #define IFNET_RLOCK_ASSERT()            sx_assert(&ifnet_sxlock, SA_SLOCKED)
861 #define IFNET_RLOCK_NOSLEEP_ASSERT()    rw_assert(&ifnet_rwlock, RA_RLOCKED)
862 #define IFNET_WLOCK_ASSERT() do {                                       \
863         sx_assert(&ifnet_sxlock, SA_XLOCKED);                           \
864         rw_assert(&ifnet_rwlock, RA_WLOCKED);                           \
865 } while (0)
866
867 #define IFNET_RLOCK()           sx_slock(&ifnet_sxlock)
868 #define IFNET_RLOCK_NOSLEEP()   rw_rlock(&ifnet_rwlock)
869 #define IFNET_RUNLOCK()         sx_sunlock(&ifnet_sxlock)
870 #define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock)
871
872 /*
873  * Look up an ifnet given its index; the _ref variant also acquires a
874  * reference that must be freed using if_rele().  It is almost always a bug
875  * to call ifnet_byindex() instead if ifnet_byindex_ref().
876  */
877 struct ifnet    *ifnet_byindex(u_short idx);
878 struct ifnet    *ifnet_byindex_locked(u_short idx);
879 struct ifnet    *ifnet_byindex_ref(u_short idx);
880
881 /*
882  * Given the index, ifaddr_byindex() returns the one and only
883  * link-level ifaddr for the interface. You are not supposed to use
884  * it to traverse the list of addresses associated to the interface.
885  */
886 struct ifaddr   *ifaddr_byindex(u_short idx);
887
888 VNET_DECLARE(struct ifnethead, ifnet);
889 VNET_DECLARE(struct ifgrouphead, ifg_head);
890 VNET_DECLARE(int, if_index);
891 VNET_DECLARE(struct ifnet *, loif);     /* first loopback interface */
892 VNET_DECLARE(int, useloopback);
893
894 #define V_ifnet         VNET(ifnet)
895 #define V_ifg_head      VNET(ifg_head)
896 #define V_if_index      VNET(if_index)
897 #define V_loif          VNET(loif)
898 #define V_useloopback   VNET(useloopback)
899
900 extern  int ifqmaxlen;
901
902 int     if_addgroup(struct ifnet *, const char *);
903 int     if_delgroup(struct ifnet *, const char *);
904 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
905 int     if_allmulti(struct ifnet *, int);
906 struct  ifnet* if_alloc(u_char);
907 void    if_attach(struct ifnet *);
908 void    if_dead(struct ifnet *);
909 int     if_delmulti(struct ifnet *, struct sockaddr *);
910 void    if_delmulti_ifma(struct ifmultiaddr *);
911 void    if_detach(struct ifnet *);
912 void    if_vmove(struct ifnet *, struct vnet *);
913 void    if_purgeaddrs(struct ifnet *);
914 void    if_delallmulti(struct ifnet *);
915 void    if_down(struct ifnet *);
916 struct ifmultiaddr *
917         if_findmulti(struct ifnet *, struct sockaddr *);
918 void    if_free(struct ifnet *);
919 void    if_free_type(struct ifnet *, u_char);
920 void    if_initname(struct ifnet *, const char *, int);
921 void    if_link_state_change(struct ifnet *, int);
922 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
923 void    if_qflush(struct ifnet *);
924 void    if_ref(struct ifnet *);
925 void    if_rele(struct ifnet *);
926 int     if_setlladdr(struct ifnet *, const u_char *, int);
927 void    if_up(struct ifnet *);
928 int     ifioctl(struct socket *, u_long, caddr_t, struct thread *);
929 int     ifpromisc(struct ifnet *, int);
930 struct  ifnet *ifunit(const char *);
931 struct  ifnet *ifunit_ref(const char *);
932
933 void    ifq_init(struct ifaltq *, struct ifnet *ifp);
934 void    ifq_delete(struct ifaltq *);
935
936 int     ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
937 int     ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
938
939 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
940 int             ifa_ifwithaddr_check(struct sockaddr *);
941 struct  ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
942 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
943 struct  ifaddr *ifa_ifwithnet(struct sockaddr *, int);
944 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
945 struct  ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
946
947 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
948
949 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
950
951 typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
952 typedef void if_com_free_t(void *com, u_char type);
953 void    if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
954 void    if_deregister_com_alloc(u_char type);
955
956 #define IF_LLADDR(ifp)                                                  \
957     LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
958
959 #ifdef DEVICE_POLLING
960 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
961
962 typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
963 int    ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
964 int    ether_poll_deregister(struct ifnet *ifp);
965 #endif /* DEVICE_POLLING */
966
967 #endif /* _KERNEL */
968
969 #endif /* !_NET_IF_VAR_H_ */