1 /*
2 * netgraph.h
3 *
4 * Copyright (c) 1996-1999 Whistle Communications, Inc.
5 * All rights reserved.
6 *
7 * Subject to the following obligations and disclaimer of warranty, use and
8 * redistribution of this software, in source or object code forms, with or
9 * without modifications are expressly permitted by Whistle Communications;
10 * provided, however, that:
11 * 1. Any and all reproductions of the source or object code must include the
12 * copyright notice above and the following disclaimer of warranties; and
13 * 2. No rights are granted, in any manner or form, to use Whistle
14 * Communications, Inc. trademarks, including the mark "WHISTLE
15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
16 * such appears in the above copyright notice or in the software.
17 *
18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
35 *
36 * Author: Julian Elischer <julian@freebsd.org>
37 *
38 * $FreeBSD: releng/5.3/sys/netgraph/netgraph.h 136588 2004-10-16 08:43:07Z cvs2svn $
39 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $
40 */
41
42 #ifndef _NETGRAPH_NETGRAPH_H_
43 #define _NETGRAPH_NETGRAPH_H_
44
45 #ifndef _KERNEL
46 #error "This file should not be included in user level programs"
47 #endif
48
49 #include <sys/queue.h>
50 #include <sys/lock.h>
51 #include <sys/malloc.h>
52 #include <sys/module.h>
53 #include <sys/mutex.h>
54 /* debugging options */
55 #define NETGRAPH_DEBUG
56 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */
57
58 /*
59 * This defines the in-kernel binary interface version.
60 * It is possible to change this but leave the external message
61 * API the same. Each type also has it's own cookies for versioning as well.
62 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
63 * modules.
64 */
65 #define _NG_ABI_VERSION 10
66 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
67 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000)
68 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
69 #define NG_ABI_VERSION _NG_ABI_VERSION
70 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
71
72
73 /*
74 * Forward references for the basic structures so we can
75 * define the typedefs and use them in the structures themselves.
76 */
77 struct ng_hook ;
78 struct ng_node ;
79 struct ng_item ;
80 typedef struct ng_item *item_p;
81 typedef struct ng_node *node_p;
82 typedef struct ng_hook *hook_p;
83
84 /* node method definitions */
85 typedef int ng_constructor_t(node_p node);
86 typedef int ng_close_t(node_p node);
87 typedef int ng_shutdown_t(node_p node);
88 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
89 typedef hook_p ng_findhook_t(node_p node, const char *name);
90 typedef int ng_connect_t(hook_p hook);
91 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
92 typedef int ng_rcvdata_t(hook_p hook, item_p item);
93 typedef int ng_disconnect_t(hook_p hook);
94 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item);
95
96 /***********************************************************************
97 ***************** Hook Structure and Methods **************************
98 ***********************************************************************
99 *
100 * Structure of a hook
101 */
102 struct ng_hook {
103 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */
104 void *hk_private; /* node dependant ID for this hook */
105 int hk_flags; /* info about this hook/link */
106 int hk_refs; /* dont actually free this till 0 */
107 struct ng_hook *hk_peer; /* the other end of this link */
108 struct ng_node *hk_node; /* The node this hook is attached to */
109 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
110 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
111 ng_rcvdata_t *hk_rcvdata; /* data comes here */
112 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
113 #define HK_MAGIC 0x78573011
114 int hk_magic;
115 char *lastfile;
116 int lastline;
117 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
118 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
119 };
120 /* Flags for a hook */
121 #define HK_INVALID 0x0001 /* don't trust it! */
122 #define HK_QUEUE 0x0002 /* queue for later delivery */
123 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
124 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
125
126 /*
127 * Public Methods for hook
128 * If you can't do it with these you probably shouldn;t be doing it.
129 */
130 void ng_unref_hook(hook_p hook); /* don't move this */
131 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1)
132 #define _NG_HOOK_NAME(hook) ((hook)->hk_name)
133 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
134 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
135 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
136 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
137 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
138 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
139 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
140 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
141 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
142 #define _NG_HOOK_FORCE_WRITER(hook) \
143 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
144 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
145
146 /* Some shortcuts */
147 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
148 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
149 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
150
151 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
152 #define _NN_ __FILE__,__LINE__
153 void dumphook (hook_p hook, char *file, int line);
154 static __inline void _chkhook(hook_p hook, char *file, int line);
155 static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
156 static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
157 static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
158 static __inline void _ng_hook_set_private(hook_p hook,
159 void * val, char * file, int line);
160 static __inline void _ng_hook_set_rcvmsg(hook_p hook,
161 ng_rcvmsg_t *val, char * file, int line);
162 static __inline void _ng_hook_set_rcvdata(hook_p hook,
163 ng_rcvdata_t *val, char * file, int line);
164 static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
165 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
166 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
167 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
168 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
169 static __inline void _ng_hook_force_writer(hook_p hook, char * file,
170 int line);
171 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line);
172
173 static void __inline
174 _chkhook(hook_p hook, char *file, int line)
175 {
176 if (hook->hk_magic != HK_MAGIC) {
177 printf("Accessing freed hook ");
178 dumphook(hook, file, line);
179 }
180 hook->lastline = line;
181 hook->lastfile = file;
182 }
183
184 static __inline void
185 _ng_hook_ref(hook_p hook, char * file, int line)
186 {
187 _chkhook(hook, file, line);
188 _NG_HOOK_REF(hook);
189 }
190
191 static __inline char *
192 _ng_hook_name(hook_p hook, char * file, int line)
193 {
194 _chkhook(hook, file, line);
195 return (_NG_HOOK_NAME(hook));
196 }
197
198 static __inline void
199 _ng_hook_unref(hook_p hook, char * file, int line)
200 {
201 _chkhook(hook, file, line);
202 _NG_HOOK_UNREF(hook);
203 }
204
205 static __inline void
206 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
207 {
208 _chkhook(hook, file, line);
209 _NG_HOOK_SET_PRIVATE(hook, val);
210 }
211
212 static __inline void
213 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
214 {
215 _chkhook(hook, file, line);
216 _NG_HOOK_SET_RCVMSG(hook, val);
217 }
218
219 static __inline void
220 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
221 {
222 _chkhook(hook, file, line);
223 _NG_HOOK_SET_RCVDATA(hook, val);
224 }
225
226 static __inline void *
227 _ng_hook_private(hook_p hook, char * file, int line)
228 {
229 _chkhook(hook, file, line);
230 return (_NG_HOOK_PRIVATE(hook));
231 }
232
233 static __inline int
234 _ng_hook_not_valid(hook_p hook, char * file, int line)
235 {
236 _chkhook(hook, file, line);
237 return (_NG_HOOK_NOT_VALID(hook));
238 }
239
240 static __inline int
241 _ng_hook_is_valid(hook_p hook, char * file, int line)
242 {
243 _chkhook(hook, file, line);
244 return (_NG_HOOK_IS_VALID(hook));
245 }
246
247 static __inline node_p
248 _ng_hook_node(hook_p hook, char * file, int line)
249 {
250 _chkhook(hook, file, line);
251 return (_NG_HOOK_NODE(hook));
252 }
253
254 static __inline hook_p
255 _ng_hook_peer(hook_p hook, char * file, int line)
256 {
257 _chkhook(hook, file, line);
258 return (_NG_HOOK_PEER(hook));
259 }
260
261 static __inline void
262 _ng_hook_force_writer(hook_p hook, char * file, int line)
263 {
264 _chkhook(hook, file, line);
265 _NG_HOOK_FORCE_WRITER(hook);
266 }
267
268 static __inline void
269 _ng_hook_force_queue(hook_p hook, char * file, int line)
270 {
271 _chkhook(hook, file, line);
272 _NG_HOOK_FORCE_QUEUE(hook);
273 }
274
275
276 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
277 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
278 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
279 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
280 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
281 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
282 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
283 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
284 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
285 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
286 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
287 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
288 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
289
290 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
291
292 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
293 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
294 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
295 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
296 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
297 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
298 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
299 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
300 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
301 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
302 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
303 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
304 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
305
306 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
307
308 /***********************************************************************
309 ***************** Node Structure and Methods **************************
310 ***********************************************************************
311 * Structure of a node
312 * including the eembedded queue structure.
313 *
314 * The structure for queueing Netgraph request items
315 * embedded in the node structure
316 */
317 struct ng_queue {
318 u_long q_flags;
319 struct mtx q_mtx;
320 item_p queue;
321 item_p *last;
322 struct ng_node *q_node; /* find the front of the node.. */
323 };
324
325 struct ng_node {
326 char nd_name[NG_NODESIZ]; /* optional globally unique name */
327 struct ng_type *nd_type; /* the installed 'type' */
328 int nd_flags; /* see below for bit definitions */
329 int nd_refs; /* # of references to this node */
330 int nd_numhooks; /* number of hooks */
331 void *nd_private; /* node type dependant node ID */
332 ng_ID_t nd_ID; /* Unique per node */
333 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
334 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */
335 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
336 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */
337 struct ng_queue nd_input_queue; /* input queue for locking */
338 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
339 #define ND_MAGIC 0x59264837
340 int nd_magic;
341 char *lastfile;
342 int lastline;
343 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
344 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
345 };
346
347 /* Flags for a node */
348 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */
349 #define NG_INVALID NGF_INVALID /* compat for old code */
350 #define NGF_WORKQ 0x00000002 /* node is on the work queue */
351 #define NG_WORKQ NGF_WORKQ /* compat for old code */
352 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */
353 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
354 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */
355 #define NG_CLOSING NGF_CLOSING /* compat for old code */
356 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */
357 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */
358 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
359 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
360 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
361 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
362
363 /*
364 * Public methods for nodes.
365 * If you can't do it with these you probably shouldn't be doing it.
366 */
367 int ng_unref_node(node_p node); /* don't move this */
368 #define _NG_NODE_NAME(node) ((node)->nd_name + 0)
369 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
370 #define _NG_NODE_ID(node) ((node)->nd_ID + 0)
371 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1)
372 #define _NG_NODE_UNREF(node) ng_unref_node(node)
373 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
374 #define _NG_NODE_PRIVATE(node) ((node)->nd_private)
375 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
376 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID)
377 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
378 #define _NG_NODE_FORCE_WRITER(node) \
379 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
380 #define _NG_NODE_REALLY_DIE(node) \
381 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
382 #define _NG_NODE_REVIVE(node) \
383 do { node->nd_flags &= ~NGF_INVALID; } while (0)
384 /*
385 * The hook iterator.
386 * This macro will call a function of type ng_fn_eachhook for each
387 * hook attached to the node. If the function returns 0, then the
388 * iterator will stop and return a pointer to the hook that returned 0.
389 */
390 typedef int ng_fn_eachhook(hook_p hook, void* arg);
391 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
392 do { \
393 hook_p _hook; \
394 (rethook) = NULL; \
395 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
396 if ((fn)(_hook, arg) == 0) { \
397 (rethook) = _hook; \
398 break; \
399 } \
400 } \
401 } while (0)
402
403 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
404 void dumpnode(node_p node, char *file, int line);
405 static void __inline _chknode(node_p node, char *file, int line);
406 static __inline char * _ng_node_name(node_p node, char *file, int line);
407 static __inline int _ng_node_has_name(node_p node, char *file, int line);
408 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
409 void ng_ref_node(node_p node);
410 static __inline void _ng_node_ref(node_p node, char *file, int line);
411 static __inline int _ng_node_unref(node_p node, char *file, int line);
412 static __inline void _ng_node_set_private(node_p node, void * val,
413 char *file, int line);
414 static __inline void * _ng_node_private(node_p node, char *file, int line);
415 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
416 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
417 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
418 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
419 static __inline hook_p _ng_node_foreach_hook(node_p node,
420 ng_fn_eachhook *fn, void *arg, char *file, int line);
421 static __inline void _ng_node_revive(node_p node, char *file, int line);
422
423 static void __inline
424 _chknode(node_p node, char *file, int line)
425 {
426 if (node->nd_magic != ND_MAGIC) {
427 printf("Accessing freed node ");
428 dumpnode(node, file, line);
429 }
430 node->lastline = line;
431 node->lastfile = file;
432 }
433
434 static __inline char *
435 _ng_node_name(node_p node, char *file, int line)
436 {
437 _chknode(node, file, line);
438 return(_NG_NODE_NAME(node));
439 }
440
441 static __inline int
442 _ng_node_has_name(node_p node, char *file, int line)
443 {
444 _chknode(node, file, line);
445 return(_NG_NODE_HAS_NAME(node));
446 }
447
448 static __inline ng_ID_t
449 _ng_node_id(node_p node, char *file, int line)
450 {
451 _chknode(node, file, line);
452 return(_NG_NODE_ID(node));
453 }
454
455 static __inline void
456 _ng_node_ref(node_p node, char *file, int line)
457 {
458 _chknode(node, file, line);
459 /*_NG_NODE_REF(node);*/
460 ng_ref_node(node);
461 }
462
463 static __inline int
464 _ng_node_unref(node_p node, char *file, int line)
465 {
466 _chknode(node, file, line);
467 return (_NG_NODE_UNREF(node));
468 }
469
470 static __inline void
471 _ng_node_set_private(node_p node, void * val, char *file, int line)
472 {
473 _chknode(node, file, line);
474 _NG_NODE_SET_PRIVATE(node, val);
475 }
476
477 static __inline void *
478 _ng_node_private(node_p node, char *file, int line)
479 {
480 _chknode(node, file, line);
481 return (_NG_NODE_PRIVATE(node));
482 }
483
484 static __inline int
485 _ng_node_is_valid(node_p node, char *file, int line)
486 {
487 _chknode(node, file, line);
488 return(_NG_NODE_IS_VALID(node));
489 }
490
491 static __inline int
492 _ng_node_not_valid(node_p node, char *file, int line)
493 {
494 _chknode(node, file, line);
495 return(_NG_NODE_NOT_VALID(node));
496 }
497
498 static __inline int
499 _ng_node_numhooks(node_p node, char *file, int line)
500 {
501 _chknode(node, file, line);
502 return(_NG_NODE_NUMHOOKS(node));
503 }
504
505 static __inline void
506 _ng_node_force_writer(node_p node, char *file, int line)
507 {
508 _chknode(node, file, line);
509 _NG_NODE_FORCE_WRITER(node);
510 }
511
512 static __inline void
513 _ng_node_really_die(node_p node, char *file, int line)
514 {
515 _chknode(node, file, line);
516 _NG_NODE_REALLY_DIE(node);
517 }
518
519 static __inline void
520 _ng_node_revive(node_p node, char *file, int line)
521 {
522 _chknode(node, file, line);
523 _NG_NODE_REVIVE(node);
524 }
525
526 static __inline hook_p
527 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
528 char *file, int line)
529 {
530 hook_p hook;
531 _chknode(node, file, line);
532 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
533 return (hook);
534 }
535
536 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
537 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
538 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
539 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
540 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
541 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
542 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
543 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
544 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
545 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
546 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
547 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
548 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
549 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
550 do { \
551 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
552 } while (0)
553
554 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
555
556 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
557 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
558 #define NG_NODE_ID(node) _NG_NODE_ID(node)
559 #define NG_NODE_REF(node) _NG_NODE_REF(node)
560 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
561 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
562 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
563 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
564 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
565 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
566 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
567 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
568 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
569 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
570 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
571 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
572
573 /***********************************************************************
574 ************* Node Queue and Item Structures and Methods **************
575 ***********************************************************************
576 *
577 */
578 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
579 struct ng_item {
580 u_long el_flags;
581 item_p el_next;
582 node_p el_dest; /* The node it will be applied against (or NULL) */
583 hook_p el_hook; /* Entering hook. Optional in Control messages */
584 union {
585 struct mbuf *da_m;
586 struct {
587 struct ng_mesg *msg_msg;
588 ng_ID_t msg_retaddr;
589 } msg;
590 struct {
591 ng_item_fn *fn_fn;
592 void *fn_arg1;
593 int fn_arg2;
594 } fn;
595 } body;
596 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
597 char *lastfile;
598 int lastline;
599 TAILQ_ENTRY(ng_item) all; /* all existing items */
600 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
601 };
602
603 #define NGQF_TYPE 0x03 /* MASK of content definition */
604 #define NGQF_MESG 0x00 /* the queue element is a message */
605 #define NGQF_DATA 0x01 /* the queue element is data */
606 #define NGQF_FN 0x02 /* the queue element is a function */
607 #define NGQF_UNDEF 0x03 /* UNDEFINED */
608
609 #define NGQF_RW 0x04 /* MASK for queue entry read/write */
610 #define NGQF_READER 0x04 /* queued as a reader */
611 #define NGQF_WRITER 0x00 /* queued as a writer */
612
613 #define NGQF_FREE 0x08
614
615 /*
616 * Get the mbuf (etc) out of an item.
617 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
618 * with it, (to avoid freeing the things twice).
619 * If you don't want to zero out the item then realise that the
620 * item still owns it.
621 * Retaddr is different. There are no references on that. It's just a number.
622 * The debug versions must be either all used everywhere or not at all.
623 */
624
625 #define _NGI_M(i) ((i)->body.da_m)
626 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
627 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
628 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
629 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
630 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
631 #define _NGI_NODE(i) ((i)->el_dest)
632 #define _NGI_HOOK(i) ((i)->el_hook)
633 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
634 #define _NGI_CLR_HOOK(i) do { \
635 hook_p _hook = _NGI_HOOK(i); \
636 if (_hook) { \
637 _NG_HOOK_UNREF(_hook); \
638 _NGI_HOOK(i) = NULL; \
639 } \
640 } while (0)
641 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
642 #define _NGI_CLR_NODE(i) do { \
643 node_p _node = _NGI_NODE(i); \
644 if (_node) { \
645 _NG_NODE_UNREF(_node); \
646 _NGI_NODE(i) = NULL; \
647 } \
648 } while (0)
649
650 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
651 void dumpitem(item_p item, char *file, int line);
652 static __inline void _ngi_check(item_p item, char *file, int line) ;
653 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
654 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
655 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
656 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
657 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
658 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
659 static __inline node_p _ngi_node(item_p item, char *file, int line);
660 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
661
662 static __inline void
663 _ngi_check(item_p item, char *file, int line)
664 {
665 if (item->el_flags & NGQF_FREE) {
666 dumpitem(item, file, line);
667 panic ("free item!");
668 }
669 (item)->lastline = line;
670 (item)->lastfile = file;
671 }
672
673 static __inline struct mbuf **
674 _ngi_m(item_p item, char *file, int line)
675 {
676 _ngi_check(item, file, line);
677 return (&_NGI_M(item));
678 }
679
680 static __inline struct ng_mesg **
681 _ngi_msg(item_p item, char *file, int line)
682 {
683 _ngi_check(item, file, line);
684 return (&_NGI_MSG(item));
685 }
686
687 static __inline ng_ID_t *
688 _ngi_retaddr(item_p item, char *file, int line)
689 {
690 _ngi_check(item, file, line);
691 return (&_NGI_RETADDR(item));
692 }
693
694 static __inline ng_item_fn **
695 _ngi_fn(item_p item, char *file, int line)
696 {
697 _ngi_check(item, file, line);
698 return (&_NGI_FN(item));
699 }
700
701 static __inline void **
702 _ngi_arg1(item_p item, char *file, int line)
703 {
704 _ngi_check(item, file, line);
705 return (&_NGI_ARG1(item));
706 }
707
708 static __inline int *
709 _ngi_arg2(item_p item, char *file, int line)
710 {
711 _ngi_check(item, file, line);
712 return (&_NGI_ARG2(item));
713 }
714
715 static __inline node_p
716 _ngi_node(item_p item, char *file, int line)
717 {
718 _ngi_check(item, file, line);
719 return (_NGI_NODE(item));
720 }
721
722 static __inline hook_p
723 _ngi_hook(item_p item, char *file, int line)
724 {
725 _ngi_check(item, file, line);
726 return (_NGI_HOOK(item));
727 }
728
729 #define NGI_M(i) (*_ngi_m(i, _NN_))
730 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
731 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
732 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
733 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
734 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
735 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
736 #define NGI_NODE(i) _ngi_node(i, _NN_)
737 #define NGI_SET_HOOK(i,h) \
738 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
739 #define NGI_CLR_HOOK(i) \
740 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
741 #define NGI_SET_NODE(i,n) \
742 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
743 #define NGI_CLR_NODE(i) \
744 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
745
746 #define NG_FREE_ITEM(item) \
747 do { \
748 _ngi_check(item, _NN_); \
749 ng_free_item((item)); \
750 } while (0)
751
752 #define SAVE_LINE(item) \
753 do { \
754 (item)->lastline = __LINE__; \
755 (item)->lastfile = __FILE__; \
756 } while (0)
757
758 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
759
760 #define NGI_M(i) _NGI_M(i)
761 #define NGI_MSG(i) _NGI_MSG(i)
762 #define NGI_RETADDR(i) _NGI_RETADDR(i)
763 #define NGI_FN(i) _NGI_FN(i)
764 #define NGI_ARG1(i) _NGI_ARG1(i)
765 #define NGI_ARG2(i) _NGI_ARG2(i)
766 #define NGI_NODE(i) _NGI_NODE(i)
767 #define NGI_HOOK(i) _NGI_HOOK(i)
768 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
769 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
770 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
771 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
772
773 #define NG_FREE_ITEM(item) ng_free_item((item))
774 #define SAVE_LINE(item) do {} while (0)
775
776 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
777
778 #define NGI_GET_M(i,m) \
779 do { \
780 (m) = NGI_M(i); \
781 _NGI_M(i) = NULL; \
782 } while (0)
783
784 #define NGI_GET_MSG(i,m) \
785 do { \
786 (m) = NGI_MSG(i); \
787 _NGI_MSG(i) = NULL; \
788 } while (0)
789
790 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
791 do { \
792 (n) = NGI_NODE(i); \
793 _NGI_NODE(i) = NULL; \
794 } while (0)
795
796 #define NGI_GET_HOOK(i,h) \
797 do { \
798 (h) = NGI_HOOK(i); \
799 _NGI_HOOK(i) = NULL; \
800 } while (0)
801
802
803 /**********************************************************************
804 * Data macros. Send, manipulate and free.
805 **********************************************************************/
806 /*
807 * Assuming the data is already ok, just set the new address and send
808 */
809 #define NG_FWD_ITEM_HOOK(error, item, hook) \
810 do { \
811 (error) = \
812 ng_address_hook(NULL, (item), (hook), 0); \
813 if (error == 0) { \
814 SAVE_LINE(item); \
815 (error) = ng_snd_item((item), 0); \
816 } \
817 (item) = NULL; \
818 } while (0)
819
820 /*
821 * Forward a data packet. Mbuf pointer is updated to new value. We
822 * presume you dealt with the old one when you update it to the new one
823 * (or it maybe the old one). We got a packet and possibly had to modify
824 * the mbuf. You should probably use NGI_GET_M() if you are going to use
825 * this too.
826 */
827 #define NG_FWD_NEW_DATA(error, item, hook, m) \
828 do { \
829 NGI_M(item) = (m); \
830 (m) = NULL; \
831 NG_FWD_ITEM_HOOK(error, item, hook); \
832 } while (0)
833
834 /* Send a previously unpackaged mbuf. XXX: This should be called
835 * NG_SEND_DATA in future, but this name is kept for compatibility
836 * reasons.
837 */
838 #define NG_SEND_DATA_ONLY(error, hook, m) \
839 do { \
840 item_p _item; \
841 if ((_item = ng_package_data((m), NULL))) { \
842 NG_FWD_ITEM_HOOK(error, _item, hook); \
843 } else { \
844 (error) = ENOMEM; \
845 } \
846 (m) = NULL; \
847 } while (0)
848
849 #define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m)
850
851 #define NG_FREE_MSG(msg) \
852 do { \
853 if ((msg)) { \
854 FREE((msg), M_NETGRAPH_MSG); \
855 (msg) = NULL; \
856 } \
857 } while (0)
858
859 #define NG_FREE_M(m) \
860 do { \
861 if ((m)) { \
862 m_freem((m)); \
863 (m) = NULL; \
864 } \
865 } while (0)
866
867 /*****************************************
868 * Message macros
869 *****************************************/
870
871 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
872 do { \
873 item_p _item; \
874 if ((_item = ng_package_msg(msg)) == NULL) { \
875 (msg) = NULL; \
876 (error) = ENOMEM; \
877 break; \
878 } \
879 if (((error) = ng_address_hook((here), (_item), \
880 (hook), (retaddr))) == 0) { \
881 SAVE_LINE(_item); \
882 (error) = ng_snd_item((_item), 0); \
883 } \
884 (msg) = NULL; \
885 } while (0)
886
887 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
888 do { \
889 item_p _item; \
890 if ((_item = ng_package_msg(msg)) == NULL) { \
891 (msg) = NULL; \
892 (error) = ENOMEM; \
893 break; \
894 } \
895 if (((error) = ng_address_path((here), (_item), \
896 (path), (retaddr))) == 0) { \
897 SAVE_LINE(_item); \
898 (error) = ng_snd_item((_item), 0); \
899 } \
900 (msg) = NULL; \
901 } while (0)
902
903 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
904 do { \
905 item_p _item; \
906 if ((_item = ng_package_msg(msg)) == NULL) { \
907 (msg) = NULL; \
908 (error) = ENOMEM; \
909 break; \
910 } \
911 if (((error) = ng_address_ID((here), (_item), \
912 (ID), (retaddr))) == 0) { \
913 SAVE_LINE(_item); \
914 (error) = ng_snd_item((_item), 0); \
915 } \
916 (msg) = NULL; \
917 } while (0)
918
919 /*
920 * Redirect the message to the next hop using the given hook.
921 * ng_retarget_msg() frees the item if there is an error
922 * and returns an error code. It returns 0 on success.
923 */
924 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
925 do { \
926 if (((error) = ng_address_hook((here), (item), \
927 (hook), (retaddr))) == 0) { \
928 SAVE_LINE(item); \
929 (error) = ng_snd_item((item), 0); \
930 } \
931 (item) = NULL; \
932 } while (0)
933
934 /*
935 * Send a queue item back to it's originator with a response message.
936 * Assume original message was removed and freed separatly.
937 */
938 #define NG_RESPOND_MSG(error, here, item, resp) \
939 do { \
940 if (resp) { \
941 ng_ID_t _dest = NGI_RETADDR(item); \
942 NGI_RETADDR(item) = 0; \
943 NGI_MSG(item) = resp; \
944 if ((ng_address_ID((here), (item), \
945 _dest, 0)) == 0) { \
946 SAVE_LINE(item); \
947 (error) = ng_snd_item((item), 1); \
948 } else { \
949 (error) = EINVAL; \
950 } \
951 } else { \
952 NG_FREE_ITEM(item); \
953 } \
954 (item) = NULL; \
955 } while (0)
956
957
958 /***********************************************************************
959 ******** Structures Definitions and Macros for defining a node *******
960 ***********************************************************************
961 *
962 * Here we define the structures needed to actually define a new node
963 * type.
964 */
965
966 /*
967 * Command list -- each node type specifies the command that it knows
968 * how to convert between ASCII and binary using an array of these.
969 * The last element in the array must be a terminator with cookie=0.
970 */
971
972 struct ng_cmdlist {
973 u_int32_t cookie; /* command typecookie */
974 int cmd; /* command number */
975 const char *name; /* command name */
976 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
977 const struct ng_parse_type *respType; /* args if NGF_RESP */
978 };
979
980 /*
981 * Structure of a node type
982 * If data is sent to the "rcvdata()" entrypoint then the system
983 * may decide to defer it until later by queing it with the normal netgraph
984 * input queuing system. This is decidde by the HK_QUEUE flag being set in
985 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
986 * ensure it is not requeued again.
987 * Note the input queueing system is to allow modules
988 * to 'release the stack' or to pass data across spl layers.
989 * The data will be redelivered as soon as the NETISR code runs
990 * which may be almost immediatly. A node may also do it's own queueing
991 * for other reasons (e.g. device output queuing).
992 */
993 struct ng_type {
994
995 u_int32_t version; /* must equal NG_API_VERSION */
996 const char *name; /* Unique type name */
997 modeventhand_t mod_event; /* Module event handler (optional) */
998 ng_constructor_t *constructor; /* Node constructor */
999 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1000 ng_close_t *close; /* warn about forthcoming shutdown */
1001 ng_shutdown_t *shutdown; /* reset, and free resources */
1002 ng_newhook_t *newhook; /* first notification of new hook */
1003 ng_findhook_t *findhook; /* only if you have lots of hooks */
1004 ng_connect_t *connect; /* final notification of new hook */
1005 ng_rcvdata_t *rcvdata; /* data comes here */
1006 ng_disconnect_t *disconnect; /* notify on disconnect */
1007
1008 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1009
1010 /* R/W data private to the base netgraph code DON'T TOUCH! */
1011 LIST_ENTRY(ng_type) types; /* linked list of all types */
1012 int refs; /* number of instances */
1013 };
1014
1015 /*
1016 * Use the NETGRAPH_INIT() macro to link a node type into the
1017 * netgraph system. This works for types compiled into the kernel
1018 * as well as KLD modules. The first argument should be the type
1019 * name (eg, echo) and the second a pointer to the type struct.
1020 *
1021 * If a different link time is desired, e.g., a device driver that
1022 * needs to install its netgraph type before probing, use the
1023 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
1024 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
1025 */
1026
1027 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1028 static moduledata_t ng_##typename##_mod = { \
1029 "ng_" #typename, \
1030 ng_mod_event, \
1031 (typestructp) \
1032 }; \
1033 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1034 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1035 NG_ABI_VERSION, \
1036 NG_ABI_VERSION)
1037
1038 #define NETGRAPH_INIT(tn, tp) \
1039 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1040
1041 /* Special malloc() type for netgraph structs and ctrl messages */
1042 /* Only these two types should be visible to nodes */
1043 MALLOC_DECLARE(M_NETGRAPH);
1044 MALLOC_DECLARE(M_NETGRAPH_MSG);
1045
1046 /* declare the base of the netgraph sysclt hierarchy */
1047 /* but only if this file cares about sysctls */
1048 #ifdef SYSCTL_DECL
1049 SYSCTL_DECL(_net_graph);
1050 #endif
1051
1052 /*
1053 * Methods that the nodes can use.
1054 * Many of these methods should usually NOT be used directly but via
1055 * Macros above.
1056 */
1057 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1058 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1059 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1060 int ng_bypass(hook_p hook1, hook_p hook2);
1061 hook_p ng_findhook(node_p node, const char *name);
1062 struct ng_type *ng_findtype(const char *type);
1063 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1064 int ng_name_node(node_p node, const char *name);
1065 int ng_newtype(struct ng_type *tp);
1066 ng_ID_t ng_node2ID(node_p node);
1067 item_p ng_package_data(struct mbuf *m, void *dummy);
1068 item_p ng_package_msg(struct ng_mesg *msg);
1069 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1070 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1071 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1072 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1073 int ng_rmtype(struct ng_type *tp);
1074 int ng_snd_item(item_p item, int queue);
1075 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
1076 void *arg1, int arg2);
1077 int ng_untimeout(struct callout_handle handle, node_p node);
1078 struct callout_handle
1079 ng_timeout(node_p node, hook_p hook, int ticks,
1080 ng_item_fn *fn, void * arg1, int arg2);
1081
1082 /*
1083 * prototypes the user should DEFINITELY not use directly
1084 */
1085 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1086 int ng_mod_event(module_t mod, int what, void *arg);
1087
1088 /*
1089 * Tag definitions and constants
1090 */
1091
1092 #define NG_TAG_PRIO 1
1093
1094 struct ng_tag_prio {
1095 struct m_tag tag;
1096 char priority;
1097 char discardability;
1098 };
1099
1100 #define NG_PRIO_CUTOFF 32
1101 #define NG_PRIO_LINKSTATE 64
1102
1103 /* Macros and declarations to keep compatibility with metadata, which
1104 * is obsoleted now. To be deleted.
1105 */
1106 typedef void *meta_p;
1107 #define _NGI_META(i) NULL
1108 #define NGI_META(i) NULL
1109 #define NG_FREE_META(meta)
1110 #define NGI_GET_META(i,m)
1111 #define ng_copy_meta(meta) NULL
1112
1113 #endif /* _NETGRAPH_NETGRAPH_H_ */
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