1 /*
2 * netgraph.h
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD$
41 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $
42 */
43
44 #ifndef _NETGRAPH_NETGRAPH_H_
45 #define _NETGRAPH_NETGRAPH_H_
46
47 #ifndef _KERNEL
48 #error "This file should not be included in user level programs"
49 #endif
50
51 #include <sys/queue.h>
52 #include <sys/lock.h>
53 #include <sys/malloc.h>
54 #include <sys/module.h>
55 #include <sys/mutex.h>
56
57 #include "opt_netgraph.h"
58
59 /* debugging options */
60 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */
61
62 /*
63 * This defines the in-kernel binary interface version.
64 * It is possible to change this but leave the external message
65 * API the same. Each type also has it's own cookies for versioning as well.
66 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
67 * modules.
68 */
69 #define _NG_ABI_VERSION 10
70 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
71 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000)
72 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
73 #define NG_ABI_VERSION _NG_ABI_VERSION
74 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
75
76
77 /*
78 * Forward references for the basic structures so we can
79 * define the typedefs and use them in the structures themselves.
80 */
81 struct ng_hook ;
82 struct ng_node ;
83 struct ng_item ;
84 typedef struct ng_item *item_p;
85 typedef struct ng_node *node_p;
86 typedef struct ng_hook *hook_p;
87
88 /* node method definitions */
89 typedef int ng_constructor_t(node_p node);
90 typedef int ng_close_t(node_p node);
91 typedef int ng_shutdown_t(node_p node);
92 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
93 typedef hook_p ng_findhook_t(node_p node, const char *name);
94 typedef int ng_connect_t(hook_p hook);
95 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
96 typedef int ng_rcvdata_t(hook_p hook, item_p item);
97 typedef int ng_disconnect_t(hook_p hook);
98 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item);
99
100 /***********************************************************************
101 ***************** Hook Structure and Methods **************************
102 ***********************************************************************
103 *
104 * Structure of a hook
105 */
106 struct ng_hook {
107 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */
108 void *hk_private; /* node dependant ID for this hook */
109 int hk_flags; /* info about this hook/link */
110 int hk_refs; /* dont actually free this till 0 */
111 struct ng_hook *hk_peer; /* the other end of this link */
112 struct ng_node *hk_node; /* The node this hook is attached to */
113 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
114 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
115 ng_rcvdata_t *hk_rcvdata; /* data comes here */
116 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
117 #define HK_MAGIC 0x78573011
118 int hk_magic;
119 char *lastfile;
120 int lastline;
121 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
122 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
123 };
124 /* Flags for a hook */
125 #define HK_INVALID 0x0001 /* don't trust it! */
126 #define HK_QUEUE 0x0002 /* queue for later delivery */
127 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
128 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
129
130 /*
131 * Public Methods for hook
132 * If you can't do it with these you probably shouldn;t be doing it.
133 */
134 void ng_unref_hook(hook_p hook); /* don't move this */
135 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1)
136 #define _NG_HOOK_NAME(hook) ((hook)->hk_name)
137 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
138 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
139 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
140 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
141 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
142 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
143 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
144 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
145 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
146 #define _NG_HOOK_FORCE_WRITER(hook) \
147 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
148 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
149
150 /* Some shortcuts */
151 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
152 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
153 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
154
155 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
156 #define _NN_ __FILE__,__LINE__
157 void dumphook (hook_p hook, char *file, int line);
158 static __inline void _chkhook(hook_p hook, char *file, int line);
159 static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
160 static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
161 static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
162 static __inline void _ng_hook_set_private(hook_p hook,
163 void * val, char * file, int line);
164 static __inline void _ng_hook_set_rcvmsg(hook_p hook,
165 ng_rcvmsg_t *val, char * file, int line);
166 static __inline void _ng_hook_set_rcvdata(hook_p hook,
167 ng_rcvdata_t *val, char * file, int line);
168 static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
169 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
170 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
171 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
172 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
173 static __inline void _ng_hook_force_writer(hook_p hook, char * file,
174 int line);
175 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line);
176
177 static __inline void
178 _chkhook(hook_p hook, char *file, int line)
179 {
180 if (hook->hk_magic != HK_MAGIC) {
181 printf("Accessing freed hook ");
182 dumphook(hook, file, line);
183 }
184 hook->lastline = line;
185 hook->lastfile = file;
186 }
187
188 static __inline void
189 _ng_hook_ref(hook_p hook, char * file, int line)
190 {
191 _chkhook(hook, file, line);
192 _NG_HOOK_REF(hook);
193 }
194
195 static __inline char *
196 _ng_hook_name(hook_p hook, char * file, int line)
197 {
198 _chkhook(hook, file, line);
199 return (_NG_HOOK_NAME(hook));
200 }
201
202 static __inline void
203 _ng_hook_unref(hook_p hook, char * file, int line)
204 {
205 _chkhook(hook, file, line);
206 _NG_HOOK_UNREF(hook);
207 }
208
209 static __inline void
210 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
211 {
212 _chkhook(hook, file, line);
213 _NG_HOOK_SET_PRIVATE(hook, val);
214 }
215
216 static __inline void
217 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
218 {
219 _chkhook(hook, file, line);
220 _NG_HOOK_SET_RCVMSG(hook, val);
221 }
222
223 static __inline void
224 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
225 {
226 _chkhook(hook, file, line);
227 _NG_HOOK_SET_RCVDATA(hook, val);
228 }
229
230 static __inline void *
231 _ng_hook_private(hook_p hook, char * file, int line)
232 {
233 _chkhook(hook, file, line);
234 return (_NG_HOOK_PRIVATE(hook));
235 }
236
237 static __inline int
238 _ng_hook_not_valid(hook_p hook, char * file, int line)
239 {
240 _chkhook(hook, file, line);
241 return (_NG_HOOK_NOT_VALID(hook));
242 }
243
244 static __inline int
245 _ng_hook_is_valid(hook_p hook, char * file, int line)
246 {
247 _chkhook(hook, file, line);
248 return (_NG_HOOK_IS_VALID(hook));
249 }
250
251 static __inline node_p
252 _ng_hook_node(hook_p hook, char * file, int line)
253 {
254 _chkhook(hook, file, line);
255 return (_NG_HOOK_NODE(hook));
256 }
257
258 static __inline hook_p
259 _ng_hook_peer(hook_p hook, char * file, int line)
260 {
261 _chkhook(hook, file, line);
262 return (_NG_HOOK_PEER(hook));
263 }
264
265 static __inline void
266 _ng_hook_force_writer(hook_p hook, char * file, int line)
267 {
268 _chkhook(hook, file, line);
269 _NG_HOOK_FORCE_WRITER(hook);
270 }
271
272 static __inline void
273 _ng_hook_force_queue(hook_p hook, char * file, int line)
274 {
275 _chkhook(hook, file, line);
276 _NG_HOOK_FORCE_QUEUE(hook);
277 }
278
279
280 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
281 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
282 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
283 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
284 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
285 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
286 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
287 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
288 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
289 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
290 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
291 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
292 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
293
294 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
295
296 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
297 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
298 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
299 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
300 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
301 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
302 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
303 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
304 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
305 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
306 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
307 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
308 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
309
310 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
311
312 /***********************************************************************
313 ***************** Node Structure and Methods **************************
314 ***********************************************************************
315 * Structure of a node
316 * including the eembedded queue structure.
317 *
318 * The structure for queueing Netgraph request items
319 * embedded in the node structure
320 */
321 struct ng_queue {
322 u_long q_flags;
323 struct mtx q_mtx;
324 item_p queue;
325 item_p *last;
326 struct ng_node *q_node; /* find the front of the node.. */
327 };
328
329 struct ng_node {
330 char nd_name[NG_NODESIZ]; /* optional globally unique name */
331 struct ng_type *nd_type; /* the installed 'type' */
332 int nd_flags; /* see below for bit definitions */
333 int nd_refs; /* # of references to this node */
334 int nd_numhooks; /* number of hooks */
335 void *nd_private; /* node type dependant node ID */
336 ng_ID_t nd_ID; /* Unique per node */
337 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
338 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */
339 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
340 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */
341 struct ng_queue nd_input_queue; /* input queue for locking */
342 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
343 #define ND_MAGIC 0x59264837
344 int nd_magic;
345 char *lastfile;
346 int lastline;
347 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
348 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
349 };
350
351 /* Flags for a node */
352 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */
353 #define NG_INVALID NGF_INVALID /* compat for old code */
354 #define NGF_WORKQ 0x00000002 /* node is on the work queue */
355 #define NG_WORKQ NGF_WORKQ /* compat for old code */
356 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */
357 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
358 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */
359 #define NG_CLOSING NGF_CLOSING /* compat for old code */
360 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */
361 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */
362 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
363 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
364 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
365 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
366
367 /*
368 * Public methods for nodes.
369 * If you can't do it with these you probably shouldn't be doing it.
370 */
371 int ng_unref_node(node_p node); /* don't move this */
372 #define _NG_NODE_NAME(node) ((node)->nd_name + 0)
373 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
374 #define _NG_NODE_ID(node) ((node)->nd_ID + 0)
375 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1)
376 #define _NG_NODE_UNREF(node) ng_unref_node(node)
377 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
378 #define _NG_NODE_PRIVATE(node) ((node)->nd_private)
379 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
380 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID)
381 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
382 #define _NG_NODE_FORCE_WRITER(node) \
383 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
384 #define _NG_NODE_REALLY_DIE(node) \
385 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
386 #define _NG_NODE_REVIVE(node) \
387 do { node->nd_flags &= ~NGF_INVALID; } while (0)
388 /*
389 * The hook iterator.
390 * This macro will call a function of type ng_fn_eachhook for each
391 * hook attached to the node. If the function returns 0, then the
392 * iterator will stop and return a pointer to the hook that returned 0.
393 */
394 typedef int ng_fn_eachhook(hook_p hook, void* arg);
395 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
396 do { \
397 hook_p _hook; \
398 (rethook) = NULL; \
399 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
400 if ((fn)(_hook, arg) == 0) { \
401 (rethook) = _hook; \
402 break; \
403 } \
404 } \
405 } while (0)
406
407 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
408 void dumpnode(node_p node, char *file, int line);
409 static __inline void _chknode(node_p node, char *file, int line);
410 static __inline char * _ng_node_name(node_p node, char *file, int line);
411 static __inline int _ng_node_has_name(node_p node, char *file, int line);
412 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
413 void ng_ref_node(node_p node);
414 static __inline void _ng_node_ref(node_p node, char *file, int line);
415 static __inline int _ng_node_unref(node_p node, char *file, int line);
416 static __inline void _ng_node_set_private(node_p node, void * val,
417 char *file, int line);
418 static __inline void * _ng_node_private(node_p node, char *file, int line);
419 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
420 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
421 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
422 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
423 static __inline hook_p _ng_node_foreach_hook(node_p node,
424 ng_fn_eachhook *fn, void *arg, char *file, int line);
425 static __inline void _ng_node_revive(node_p node, char *file, int line);
426
427 static __inline void
428 _chknode(node_p node, char *file, int line)
429 {
430 if (node->nd_magic != ND_MAGIC) {
431 printf("Accessing freed node ");
432 dumpnode(node, file, line);
433 }
434 node->lastline = line;
435 node->lastfile = file;
436 }
437
438 static __inline char *
439 _ng_node_name(node_p node, char *file, int line)
440 {
441 _chknode(node, file, line);
442 return(_NG_NODE_NAME(node));
443 }
444
445 static __inline int
446 _ng_node_has_name(node_p node, char *file, int line)
447 {
448 _chknode(node, file, line);
449 return(_NG_NODE_HAS_NAME(node));
450 }
451
452 static __inline ng_ID_t
453 _ng_node_id(node_p node, char *file, int line)
454 {
455 _chknode(node, file, line);
456 return(_NG_NODE_ID(node));
457 }
458
459 static __inline void
460 _ng_node_ref(node_p node, char *file, int line)
461 {
462 _chknode(node, file, line);
463 /*_NG_NODE_REF(node);*/
464 ng_ref_node(node);
465 }
466
467 static __inline int
468 _ng_node_unref(node_p node, char *file, int line)
469 {
470 _chknode(node, file, line);
471 return (_NG_NODE_UNREF(node));
472 }
473
474 static __inline void
475 _ng_node_set_private(node_p node, void * val, char *file, int line)
476 {
477 _chknode(node, file, line);
478 _NG_NODE_SET_PRIVATE(node, val);
479 }
480
481 static __inline void *
482 _ng_node_private(node_p node, char *file, int line)
483 {
484 _chknode(node, file, line);
485 return (_NG_NODE_PRIVATE(node));
486 }
487
488 static __inline int
489 _ng_node_is_valid(node_p node, char *file, int line)
490 {
491 _chknode(node, file, line);
492 return(_NG_NODE_IS_VALID(node));
493 }
494
495 static __inline int
496 _ng_node_not_valid(node_p node, char *file, int line)
497 {
498 _chknode(node, file, line);
499 return(_NG_NODE_NOT_VALID(node));
500 }
501
502 static __inline int
503 _ng_node_numhooks(node_p node, char *file, int line)
504 {
505 _chknode(node, file, line);
506 return(_NG_NODE_NUMHOOKS(node));
507 }
508
509 static __inline void
510 _ng_node_force_writer(node_p node, char *file, int line)
511 {
512 _chknode(node, file, line);
513 _NG_NODE_FORCE_WRITER(node);
514 }
515
516 static __inline void
517 _ng_node_really_die(node_p node, char *file, int line)
518 {
519 _chknode(node, file, line);
520 _NG_NODE_REALLY_DIE(node);
521 }
522
523 static __inline void
524 _ng_node_revive(node_p node, char *file, int line)
525 {
526 _chknode(node, file, line);
527 _NG_NODE_REVIVE(node);
528 }
529
530 static __inline hook_p
531 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
532 char *file, int line)
533 {
534 hook_p hook;
535 _chknode(node, file, line);
536 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
537 return (hook);
538 }
539
540 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
541 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
542 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
543 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
544 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
545 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
546 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
547 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
548 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
549 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
550 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
551 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
552 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
553 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
554 do { \
555 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
556 } while (0)
557
558 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
559
560 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
561 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
562 #define NG_NODE_ID(node) _NG_NODE_ID(node)
563 #define NG_NODE_REF(node) _NG_NODE_REF(node)
564 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
565 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
566 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
567 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
568 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
569 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
570 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
571 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
572 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
573 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
574 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
575 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
576
577 /***********************************************************************
578 ************* Node Queue and Item Structures and Methods **************
579 ***********************************************************************
580 *
581 */
582 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
583 struct ng_item {
584 u_long el_flags;
585 item_p el_next;
586 node_p el_dest; /* The node it will be applied against (or NULL) */
587 hook_p el_hook; /* Entering hook. Optional in Control messages */
588 union {
589 struct mbuf *da_m;
590 struct {
591 struct ng_mesg *msg_msg;
592 ng_ID_t msg_retaddr;
593 } msg;
594 struct {
595 ng_item_fn *fn_fn;
596 void *fn_arg1;
597 int fn_arg2;
598 } fn;
599 } body;
600 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
601 char *lastfile;
602 int lastline;
603 TAILQ_ENTRY(ng_item) all; /* all existing items */
604 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
605 };
606
607 #define NGQF_TYPE 0x03 /* MASK of content definition */
608 #define NGQF_MESG 0x00 /* the queue element is a message */
609 #define NGQF_DATA 0x01 /* the queue element is data */
610 #define NGQF_FN 0x02 /* the queue element is a function */
611 #define NGQF_UNDEF 0x03 /* UNDEFINED */
612
613 #define NGQF_RW 0x04 /* MASK for queue entry read/write */
614 #define NGQF_READER 0x04 /* queued as a reader */
615 #define NGQF_WRITER 0x00 /* queued as a writer */
616
617 /*
618 * Get the mbuf (etc) out of an item.
619 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
620 * with it, (to avoid freeing the things twice).
621 * If you don't want to zero out the item then realise that the
622 * item still owns it.
623 * Retaddr is different. There are no references on that. It's just a number.
624 * The debug versions must be either all used everywhere or not at all.
625 */
626
627 #define _NGI_M(i) ((i)->body.da_m)
628 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
629 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
630 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
631 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
632 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
633 #define _NGI_NODE(i) ((i)->el_dest)
634 #define _NGI_HOOK(i) ((i)->el_hook)
635 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
636 #define _NGI_CLR_HOOK(i) do { \
637 hook_p _hook = _NGI_HOOK(i); \
638 if (_hook) { \
639 _NG_HOOK_UNREF(_hook); \
640 _NGI_HOOK(i) = NULL; \
641 } \
642 } while (0)
643 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
644 #define _NGI_CLR_NODE(i) do { \
645 node_p _node = _NGI_NODE(i); \
646 if (_node) { \
647 _NG_NODE_UNREF(_node); \
648 _NGI_NODE(i) = NULL; \
649 } \
650 } while (0)
651
652 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
653 void dumpitem(item_p item, char *file, int line);
654 static __inline void _ngi_check(item_p item, char *file, int line) ;
655 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
656 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
657 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
658 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
659 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
660 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
661 static __inline node_p _ngi_node(item_p item, char *file, int line);
662 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
663
664 static __inline void
665 _ngi_check(item_p item, char *file, int line)
666 {
667 (item)->lastline = line;
668 (item)->lastfile = file;
669 }
670
671 static __inline struct mbuf **
672 _ngi_m(item_p item, char *file, int line)
673 {
674 _ngi_check(item, file, line);
675 return (&_NGI_M(item));
676 }
677
678 static __inline struct ng_mesg **
679 _ngi_msg(item_p item, char *file, int line)
680 {
681 _ngi_check(item, file, line);
682 return (&_NGI_MSG(item));
683 }
684
685 static __inline ng_ID_t *
686 _ngi_retaddr(item_p item, char *file, int line)
687 {
688 _ngi_check(item, file, line);
689 return (&_NGI_RETADDR(item));
690 }
691
692 static __inline ng_item_fn **
693 _ngi_fn(item_p item, char *file, int line)
694 {
695 _ngi_check(item, file, line);
696 return (&_NGI_FN(item));
697 }
698
699 static __inline void **
700 _ngi_arg1(item_p item, char *file, int line)
701 {
702 _ngi_check(item, file, line);
703 return (&_NGI_ARG1(item));
704 }
705
706 static __inline int *
707 _ngi_arg2(item_p item, char *file, int line)
708 {
709 _ngi_check(item, file, line);
710 return (&_NGI_ARG2(item));
711 }
712
713 static __inline node_p
714 _ngi_node(item_p item, char *file, int line)
715 {
716 _ngi_check(item, file, line);
717 return (_NGI_NODE(item));
718 }
719
720 static __inline hook_p
721 _ngi_hook(item_p item, char *file, int line)
722 {
723 _ngi_check(item, file, line);
724 return (_NGI_HOOK(item));
725 }
726
727 #define NGI_M(i) (*_ngi_m(i, _NN_))
728 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
729 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
730 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
731 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
732 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
733 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
734 #define NGI_NODE(i) _ngi_node(i, _NN_)
735 #define NGI_SET_HOOK(i,h) \
736 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
737 #define NGI_CLR_HOOK(i) \
738 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
739 #define NGI_SET_NODE(i,n) \
740 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
741 #define NGI_CLR_NODE(i) \
742 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
743
744 #define NG_FREE_ITEM(item) \
745 do { \
746 _ngi_check(item, _NN_); \
747 ng_free_item((item)); \
748 } while (0)
749
750 #define SAVE_LINE(item) \
751 do { \
752 (item)->lastline = __LINE__; \
753 (item)->lastfile = __FILE__; \
754 } while (0)
755
756 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
757
758 #define NGI_M(i) _NGI_M(i)
759 #define NGI_MSG(i) _NGI_MSG(i)
760 #define NGI_RETADDR(i) _NGI_RETADDR(i)
761 #define NGI_FN(i) _NGI_FN(i)
762 #define NGI_ARG1(i) _NGI_ARG1(i)
763 #define NGI_ARG2(i) _NGI_ARG2(i)
764 #define NGI_NODE(i) _NGI_NODE(i)
765 #define NGI_HOOK(i) _NGI_HOOK(i)
766 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
767 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
768 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
769 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
770
771 #define NG_FREE_ITEM(item) ng_free_item((item))
772 #define SAVE_LINE(item) do {} while (0)
773
774 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
775
776 #define NGI_GET_M(i,m) \
777 do { \
778 (m) = NGI_M(i); \
779 _NGI_M(i) = NULL; \
780 } while (0)
781
782 #define NGI_GET_MSG(i,m) \
783 do { \
784 (m) = NGI_MSG(i); \
785 _NGI_MSG(i) = NULL; \
786 } while (0)
787
788 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
789 do { \
790 (n) = NGI_NODE(i); \
791 _NGI_NODE(i) = NULL; \
792 } while (0)
793
794 #define NGI_GET_HOOK(i,h) \
795 do { \
796 (h) = NGI_HOOK(i); \
797 _NGI_HOOK(i) = NULL; \
798 } while (0)
799
800
801 /**********************************************************************
802 * Data macros. Send, manipulate and free.
803 **********************************************************************/
804 /*
805 * Assuming the data is already ok, just set the new address and send
806 */
807 #define NG_FWD_ITEM_HOOK(error, item, hook) \
808 do { \
809 (error) = \
810 ng_address_hook(NULL, (item), (hook), 0); \
811 if (error == 0) { \
812 SAVE_LINE(item); \
813 (error) = ng_snd_item((item), 0); \
814 } \
815 (item) = NULL; \
816 } while (0)
817
818 /*
819 * Forward a data packet. Mbuf pointer is updated to new value. We
820 * presume you dealt with the old one when you update it to the new one
821 * (or it maybe the old one). We got a packet and possibly had to modify
822 * the mbuf. You should probably use NGI_GET_M() if you are going to use
823 * this too.
824 */
825 #define NG_FWD_NEW_DATA(error, item, hook, m) \
826 do { \
827 NGI_M(item) = (m); \
828 (m) = NULL; \
829 NG_FWD_ITEM_HOOK(error, item, hook); \
830 } while (0)
831
832 /* Send a previously unpackaged mbuf. XXX: This should be called
833 * NG_SEND_DATA in future, but this name is kept for compatibility
834 * reasons.
835 */
836 #define NG_SEND_DATA_ONLY(error, hook, m) \
837 do { \
838 item_p _item; \
839 if ((_item = ng_package_data((m), NULL))) { \
840 NG_FWD_ITEM_HOOK(error, _item, hook); \
841 } else { \
842 (error) = ENOMEM; \
843 } \
844 (m) = NULL; \
845 } while (0)
846
847 #define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m)
848
849 #define NG_FREE_MSG(msg) \
850 do { \
851 if ((msg)) { \
852 FREE((msg), M_NETGRAPH_MSG); \
853 (msg) = NULL; \
854 } \
855 } while (0)
856
857 #define NG_FREE_M(m) \
858 do { \
859 if ((m)) { \
860 m_freem((m)); \
861 (m) = NULL; \
862 } \
863 } while (0)
864
865 /*****************************************
866 * Message macros
867 *****************************************/
868
869 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
870 do { \
871 item_p _item; \
872 if ((_item = ng_package_msg(msg)) == NULL) { \
873 (msg) = NULL; \
874 (error) = ENOMEM; \
875 break; \
876 } \
877 if (((error) = ng_address_hook((here), (_item), \
878 (hook), (retaddr))) == 0) { \
879 SAVE_LINE(_item); \
880 (error) = ng_snd_item((_item), 0); \
881 } \
882 (msg) = NULL; \
883 } while (0)
884
885 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
886 do { \
887 item_p _item; \
888 if ((_item = ng_package_msg(msg)) == NULL) { \
889 (msg) = NULL; \
890 (error) = ENOMEM; \
891 break; \
892 } \
893 if (((error) = ng_address_path((here), (_item), \
894 (path), (retaddr))) == 0) { \
895 SAVE_LINE(_item); \
896 (error) = ng_snd_item((_item), 0); \
897 } \
898 (msg) = NULL; \
899 } while (0)
900
901 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
902 do { \
903 item_p _item; \
904 if ((_item = ng_package_msg(msg)) == NULL) { \
905 (msg) = NULL; \
906 (error) = ENOMEM; \
907 break; \
908 } \
909 if (((error) = ng_address_ID((here), (_item), \
910 (ID), (retaddr))) == 0) { \
911 SAVE_LINE(_item); \
912 (error) = ng_snd_item((_item), 0); \
913 } \
914 (msg) = NULL; \
915 } while (0)
916
917 /*
918 * Redirect the message to the next hop using the given hook.
919 * ng_retarget_msg() frees the item if there is an error
920 * and returns an error code. It returns 0 on success.
921 */
922 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
923 do { \
924 if (((error) = ng_address_hook((here), (item), \
925 (hook), (retaddr))) == 0) { \
926 SAVE_LINE(item); \
927 (error) = ng_snd_item((item), 0); \
928 } \
929 (item) = NULL; \
930 } while (0)
931
932 /*
933 * Send a queue item back to it's originator with a response message.
934 * Assume original message was removed and freed separatly.
935 */
936 #define NG_RESPOND_MSG(error, here, item, resp) \
937 do { \
938 if (resp) { \
939 ng_ID_t _dest = NGI_RETADDR(item); \
940 NGI_RETADDR(item) = 0; \
941 NGI_MSG(item) = resp; \
942 if ((ng_address_ID((here), (item), \
943 _dest, 0)) == 0) { \
944 SAVE_LINE(item); \
945 (error) = ng_snd_item((item), 1); \
946 } else { \
947 NG_FREE_ITEM(item); \
948 (error) = EINVAL; \
949 } \
950 } else { \
951 NG_FREE_ITEM(item); \
952 } \
953 (item) = NULL; \
954 } while (0)
955
956
957 /***********************************************************************
958 ******** Structures Definitions and Macros for defining a node *******
959 ***********************************************************************
960 *
961 * Here we define the structures needed to actually define a new node
962 * type.
963 */
964
965 /*
966 * Command list -- each node type specifies the command that it knows
967 * how to convert between ASCII and binary using an array of these.
968 * The last element in the array must be a terminator with cookie=0.
969 */
970
971 struct ng_cmdlist {
972 u_int32_t cookie; /* command typecookie */
973 int cmd; /* command number */
974 const char *name; /* command name */
975 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
976 const struct ng_parse_type *respType; /* args if NGF_RESP */
977 };
978
979 /*
980 * Structure of a node type
981 * If data is sent to the "rcvdata()" entrypoint then the system
982 * may decide to defer it until later by queing it with the normal netgraph
983 * input queuing system. This is decidde by the HK_QUEUE flag being set in
984 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
985 * ensure it is not requeued again.
986 * Note the input queueing system is to allow modules
987 * to 'release the stack' or to pass data across spl layers.
988 * The data will be redelivered as soon as the NETISR code runs
989 * which may be almost immediatly. A node may also do it's own queueing
990 * for other reasons (e.g. device output queuing).
991 */
992 struct ng_type {
993
994 u_int32_t version; /* must equal NG_API_VERSION */
995 const char *name; /* Unique type name */
996 modeventhand_t mod_event; /* Module event handler (optional) */
997 ng_constructor_t *constructor; /* Node constructor */
998 ng_rcvmsg_t *rcvmsg; /* control messages come here */
999 ng_close_t *close; /* warn about forthcoming shutdown */
1000 ng_shutdown_t *shutdown; /* reset, and free resources */
1001 ng_newhook_t *newhook; /* first notification of new hook */
1002 ng_findhook_t *findhook; /* only if you have lots of hooks */
1003 ng_connect_t *connect; /* final notification of new hook */
1004 ng_rcvdata_t *rcvdata; /* data comes here */
1005 ng_disconnect_t *disconnect; /* notify on disconnect */
1006
1007 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1008
1009 /* R/W data private to the base netgraph code DON'T TOUCH! */
1010 LIST_ENTRY(ng_type) types; /* linked list of all types */
1011 int refs; /* number of instances */
1012 };
1013
1014 /*
1015 * Use the NETGRAPH_INIT() macro to link a node type into the
1016 * netgraph system. This works for types compiled into the kernel
1017 * as well as KLD modules. The first argument should be the type
1018 * name (eg, echo) and the second a pointer to the type struct.
1019 *
1020 * If a different link time is desired, e.g., a device driver that
1021 * needs to install its netgraph type before probing, use the
1022 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
1023 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
1024 */
1025
1026 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1027 static moduledata_t ng_##typename##_mod = { \
1028 "ng_" #typename, \
1029 ng_mod_event, \
1030 (typestructp) \
1031 }; \
1032 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1033 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1034 NG_ABI_VERSION, \
1035 NG_ABI_VERSION)
1036
1037 #define NETGRAPH_INIT(tn, tp) \
1038 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1039
1040 /* Special malloc() type for netgraph structs and ctrl messages */
1041 /* Only these two types should be visible to nodes */
1042 MALLOC_DECLARE(M_NETGRAPH);
1043 MALLOC_DECLARE(M_NETGRAPH_MSG);
1044
1045 /* declare the base of the netgraph sysclt hierarchy */
1046 /* but only if this file cares about sysctls */
1047 #ifdef SYSCTL_DECL
1048 SYSCTL_DECL(_net_graph);
1049 #endif
1050
1051 /*
1052 * Methods that the nodes can use.
1053 * Many of these methods should usually NOT be used directly but via
1054 * Macros above.
1055 */
1056 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1057 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1058 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1059 int ng_bypass(hook_p hook1, hook_p hook2);
1060 hook_p ng_findhook(node_p node, const char *name);
1061 struct ng_type *ng_findtype(const char *type);
1062 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1063 int ng_name_node(node_p node, const char *name);
1064 int ng_newtype(struct ng_type *tp);
1065 ng_ID_t ng_node2ID(node_p node);
1066 item_p ng_package_data(struct mbuf *m, void *dummy);
1067 item_p ng_package_msg(struct ng_mesg *msg);
1068 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1069 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1070 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1071 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1072 int ng_rmtype(struct ng_type *tp);
1073 int ng_snd_item(item_p item, int queue);
1074 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
1075 void *arg1, int arg2);
1076 int ng_queue_fn(node_p node, hook_p hook, ng_item_fn *fn,
1077 void *arg1, int arg2);
1078 int ng_uncallout(struct callout *c, node_p node);
1079 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1080 ng_item_fn *fn, void * arg1, int arg2);
1081 #define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE)
1082
1083 /* Deprecated functions kept for compatibility */
1084 int ng_untimeout(struct callout_handle handle, node_p node);
1085 struct callout_handle
1086 ng_timeout(node_p node, hook_p hook, int ticks,
1087 ng_item_fn *fn, void * arg1, int arg2);
1088
1089 /*
1090 * prototypes the user should DEFINITELY not use directly
1091 */
1092 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1093 int ng_mod_event(module_t mod, int what, void *arg);
1094
1095 /*
1096 * Tag definitions and constants
1097 */
1098
1099 #define NG_TAG_PRIO 1
1100
1101 struct ng_tag_prio {
1102 struct m_tag tag;
1103 char priority;
1104 char discardability;
1105 };
1106
1107 #define NG_PRIO_CUTOFF 32
1108 #define NG_PRIO_LINKSTATE 64
1109
1110 /* Macros and declarations to keep compatibility with metadata, which
1111 * is obsoleted now. To be deleted.
1112 */
1113 typedef void *meta_p;
1114 #define _NGI_META(i) NULL
1115 #define NGI_META(i) NULL
1116 #define NG_FREE_META(meta)
1117 #define NGI_GET_META(i,m)
1118 #define ng_copy_meta(meta) NULL
1119
1120 #endif /* _NETGRAPH_NETGRAPH_H_ */
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