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: releng/6.0/sys/netgraph/netgraph.h 149108 2005-08-15 20:04:28Z julian $
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 11
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 int hk_type; /* tbd: hook data link type */
112 struct ng_hook *hk_peer; /* the other end of this link */
113 struct ng_node *hk_node; /* The node this hook is attached to */
114 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
115 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
116 ng_rcvdata_t *hk_rcvdata; /* data comes here */
117 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
118 #define HK_MAGIC 0x78573011
119 int hk_magic;
120 char *lastfile;
121 int lastline;
122 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
123 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
124 };
125 /* Flags for a hook */
126 #define HK_INVALID 0x0001 /* don't trust it! */
127 #define HK_QUEUE 0x0002 /* queue for later delivery */
128 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
129 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
130
131 /*
132 * Public Methods for hook
133 * If you can't do it with these you probably shouldn;t be doing it.
134 */
135 void ng_unref_hook(hook_p hook); /* don't move this */
136 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1)
137 #define _NG_HOOK_NAME(hook) ((hook)->hk_name)
138 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
139 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
140 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
141 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
142 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
143 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
144 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
145 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
146 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
147 #define _NG_HOOK_FORCE_WRITER(hook) \
148 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
149 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
150
151 /* Some shortcuts */
152 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
153 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
154 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
155
156 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
157 #define _NN_ __FILE__,__LINE__
158 void dumphook (hook_p hook, char *file, int line);
159 static __inline void _chkhook(hook_p hook, char *file, int line);
160 static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
161 static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
162 static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
163 static __inline void _ng_hook_set_private(hook_p hook,
164 void * val, char * file, int line);
165 static __inline void _ng_hook_set_rcvmsg(hook_p hook,
166 ng_rcvmsg_t *val, char * file, int line);
167 static __inline void _ng_hook_set_rcvdata(hook_p hook,
168 ng_rcvdata_t *val, char * file, int line);
169 static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
170 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
171 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
172 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
173 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
174 static __inline void _ng_hook_force_writer(hook_p hook, char * file,
175 int line);
176 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line);
177
178 static __inline void
179 _chkhook(hook_p hook, char *file, int line)
180 {
181 if (hook->hk_magic != HK_MAGIC) {
182 printf("Accessing freed hook ");
183 dumphook(hook, file, line);
184 }
185 hook->lastline = line;
186 hook->lastfile = file;
187 }
188
189 static __inline void
190 _ng_hook_ref(hook_p hook, char * file, int line)
191 {
192 _chkhook(hook, file, line);
193 _NG_HOOK_REF(hook);
194 }
195
196 static __inline char *
197 _ng_hook_name(hook_p hook, char * file, int line)
198 {
199 _chkhook(hook, file, line);
200 return (_NG_HOOK_NAME(hook));
201 }
202
203 static __inline void
204 _ng_hook_unref(hook_p hook, char * file, int line)
205 {
206 _chkhook(hook, file, line);
207 _NG_HOOK_UNREF(hook);
208 }
209
210 static __inline void
211 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
212 {
213 _chkhook(hook, file, line);
214 _NG_HOOK_SET_PRIVATE(hook, val);
215 }
216
217 static __inline void
218 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
219 {
220 _chkhook(hook, file, line);
221 _NG_HOOK_SET_RCVMSG(hook, val);
222 }
223
224 static __inline void
225 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
226 {
227 _chkhook(hook, file, line);
228 _NG_HOOK_SET_RCVDATA(hook, val);
229 }
230
231 static __inline void *
232 _ng_hook_private(hook_p hook, char * file, int line)
233 {
234 _chkhook(hook, file, line);
235 return (_NG_HOOK_PRIVATE(hook));
236 }
237
238 static __inline int
239 _ng_hook_not_valid(hook_p hook, char * file, int line)
240 {
241 _chkhook(hook, file, line);
242 return (_NG_HOOK_NOT_VALID(hook));
243 }
244
245 static __inline int
246 _ng_hook_is_valid(hook_p hook, char * file, int line)
247 {
248 _chkhook(hook, file, line);
249 return (_NG_HOOK_IS_VALID(hook));
250 }
251
252 static __inline node_p
253 _ng_hook_node(hook_p hook, char * file, int line)
254 {
255 _chkhook(hook, file, line);
256 return (_NG_HOOK_NODE(hook));
257 }
258
259 static __inline hook_p
260 _ng_hook_peer(hook_p hook, char * file, int line)
261 {
262 _chkhook(hook, file, line);
263 return (_NG_HOOK_PEER(hook));
264 }
265
266 static __inline void
267 _ng_hook_force_writer(hook_p hook, char * file, int line)
268 {
269 _chkhook(hook, file, line);
270 _NG_HOOK_FORCE_WRITER(hook);
271 }
272
273 static __inline void
274 _ng_hook_force_queue(hook_p hook, char * file, int line)
275 {
276 _chkhook(hook, file, line);
277 _NG_HOOK_FORCE_QUEUE(hook);
278 }
279
280
281 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
282 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
283 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
284 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
285 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
286 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
287 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
288 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
289 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
290 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
291 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
292 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
293 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
294
295 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
296
297 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
298 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
299 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
300 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
301 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
302 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
303 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
304 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
305 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
306 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
307 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
308 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
309 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
310
311 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
312
313 /***********************************************************************
314 ***************** Node Structure and Methods **************************
315 ***********************************************************************
316 * Structure of a node
317 * including the eembedded queue structure.
318 *
319 * The structure for queueing Netgraph request items
320 * embedded in the node structure
321 */
322 struct ng_queue {
323 u_long q_flags;
324 struct mtx q_mtx;
325 item_p queue;
326 item_p *last;
327 struct ng_node *q_node; /* find the front of the node.. */
328 };
329
330 struct ng_node {
331 char nd_name[NG_NODESIZ]; /* optional globally unique name */
332 struct ng_type *nd_type; /* the installed 'type' */
333 int nd_flags; /* see below for bit definitions */
334 int nd_refs; /* # of references to this node */
335 int nd_numhooks; /* number of hooks */
336 void *nd_private; /* node type dependant node ID */
337 ng_ID_t nd_ID; /* Unique per node */
338 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
339 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */
340 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
341 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */
342 struct ng_queue nd_input_queue; /* input queue for locking */
343 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
344 #define ND_MAGIC 0x59264837
345 int nd_magic;
346 char *lastfile;
347 int lastline;
348 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
349 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
350 };
351
352 /* Flags for a node */
353 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */
354 #define NG_INVALID NGF_INVALID /* compat for old code */
355 #define NGF_WORKQ 0x00000002 /* node is on the work queue */
356 #define NG_WORKQ NGF_WORKQ /* compat for old code */
357 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */
358 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
359 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */
360 #define NG_CLOSING NGF_CLOSING /* compat for old code */
361 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */
362 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */
363 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
364 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
365 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
366 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
367
368 /*
369 * Public methods for nodes.
370 * If you can't do it with these you probably shouldn't be doing it.
371 */
372 int ng_unref_node(node_p node); /* don't move this */
373 #define _NG_NODE_NAME(node) ((node)->nd_name + 0)
374 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
375 #define _NG_NODE_ID(node) ((node)->nd_ID + 0)
376 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1)
377 #define _NG_NODE_UNREF(node) ng_unref_node(node)
378 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
379 #define _NG_NODE_PRIVATE(node) ((node)->nd_private)
380 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
381 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID)
382 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
383 #define _NG_NODE_FORCE_WRITER(node) \
384 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
385 #define _NG_NODE_REALLY_DIE(node) \
386 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
387 #define _NG_NODE_REVIVE(node) \
388 do { node->nd_flags &= ~NGF_INVALID; } while (0)
389 /*
390 * The hook iterator.
391 * This macro will call a function of type ng_fn_eachhook for each
392 * hook attached to the node. If the function returns 0, then the
393 * iterator will stop and return a pointer to the hook that returned 0.
394 */
395 typedef int ng_fn_eachhook(hook_p hook, void* arg);
396 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
397 do { \
398 hook_p _hook; \
399 (rethook) = NULL; \
400 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
401 if ((fn)(_hook, arg) == 0) { \
402 (rethook) = _hook; \
403 break; \
404 } \
405 } \
406 } while (0)
407
408 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
409 void dumpnode(node_p node, char *file, int line);
410 static __inline void _chknode(node_p node, char *file, int line);
411 static __inline char * _ng_node_name(node_p node, char *file, int line);
412 static __inline int _ng_node_has_name(node_p node, char *file, int line);
413 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
414 void ng_ref_node(node_p node);
415 static __inline void _ng_node_ref(node_p node, char *file, int line);
416 static __inline int _ng_node_unref(node_p node, char *file, int line);
417 static __inline void _ng_node_set_private(node_p node, void * val,
418 char *file, int line);
419 static __inline void * _ng_node_private(node_p node, char *file, int line);
420 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
421 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
422 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
423 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
424 static __inline hook_p _ng_node_foreach_hook(node_p node,
425 ng_fn_eachhook *fn, void *arg, char *file, int line);
426 static __inline void _ng_node_revive(node_p node, char *file, int line);
427
428 static __inline void
429 _chknode(node_p node, char *file, int line)
430 {
431 if (node->nd_magic != ND_MAGIC) {
432 printf("Accessing freed node ");
433 dumpnode(node, file, line);
434 }
435 node->lastline = line;
436 node->lastfile = file;
437 }
438
439 static __inline char *
440 _ng_node_name(node_p node, char *file, int line)
441 {
442 _chknode(node, file, line);
443 return(_NG_NODE_NAME(node));
444 }
445
446 static __inline int
447 _ng_node_has_name(node_p node, char *file, int line)
448 {
449 _chknode(node, file, line);
450 return(_NG_NODE_HAS_NAME(node));
451 }
452
453 static __inline ng_ID_t
454 _ng_node_id(node_p node, char *file, int line)
455 {
456 _chknode(node, file, line);
457 return(_NG_NODE_ID(node));
458 }
459
460 static __inline void
461 _ng_node_ref(node_p node, char *file, int line)
462 {
463 _chknode(node, file, line);
464 /*_NG_NODE_REF(node);*/
465 ng_ref_node(node);
466 }
467
468 static __inline int
469 _ng_node_unref(node_p node, char *file, int line)
470 {
471 _chknode(node, file, line);
472 return (_NG_NODE_UNREF(node));
473 }
474
475 static __inline void
476 _ng_node_set_private(node_p node, void * val, char *file, int line)
477 {
478 _chknode(node, file, line);
479 _NG_NODE_SET_PRIVATE(node, val);
480 }
481
482 static __inline void *
483 _ng_node_private(node_p node, char *file, int line)
484 {
485 _chknode(node, file, line);
486 return (_NG_NODE_PRIVATE(node));
487 }
488
489 static __inline int
490 _ng_node_is_valid(node_p node, char *file, int line)
491 {
492 _chknode(node, file, line);
493 return(_NG_NODE_IS_VALID(node));
494 }
495
496 static __inline int
497 _ng_node_not_valid(node_p node, char *file, int line)
498 {
499 _chknode(node, file, line);
500 return(_NG_NODE_NOT_VALID(node));
501 }
502
503 static __inline int
504 _ng_node_numhooks(node_p node, char *file, int line)
505 {
506 _chknode(node, file, line);
507 return(_NG_NODE_NUMHOOKS(node));
508 }
509
510 static __inline void
511 _ng_node_force_writer(node_p node, char *file, int line)
512 {
513 _chknode(node, file, line);
514 _NG_NODE_FORCE_WRITER(node);
515 }
516
517 static __inline void
518 _ng_node_really_die(node_p node, char *file, int line)
519 {
520 _chknode(node, file, line);
521 _NG_NODE_REALLY_DIE(node);
522 }
523
524 static __inline void
525 _ng_node_revive(node_p node, char *file, int line)
526 {
527 _chknode(node, file, line);
528 _NG_NODE_REVIVE(node);
529 }
530
531 static __inline hook_p
532 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
533 char *file, int line)
534 {
535 hook_p hook;
536 _chknode(node, file, line);
537 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
538 return (hook);
539 }
540
541 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
542 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
543 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
544 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
545 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
546 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
547 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
548 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
549 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
550 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
551 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
552 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
553 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
554 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
555 do { \
556 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
557 } while (0)
558
559 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
560
561 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
562 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
563 #define NG_NODE_ID(node) _NG_NODE_ID(node)
564 #define NG_NODE_REF(node) _NG_NODE_REF(node)
565 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
566 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
567 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
568 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
569 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
570 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
571 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
572 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
573 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
574 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
575 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
576 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
577
578 /***********************************************************************
579 ************* Node Queue and Item Structures and Methods **************
580 ***********************************************************************
581 *
582 */
583 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
584 typedef void ng_apply_t(void *context, int error);
585 struct ng_item {
586 u_long el_flags;
587 item_p el_next;
588 node_p el_dest; /* The node it will be applied against (or NULL) */
589 hook_p el_hook; /* Entering hook. Optional in Control messages */
590 union {
591 struct mbuf *da_m;
592 struct {
593 struct ng_mesg *msg_msg;
594 ng_ID_t msg_retaddr;
595 } msg;
596 struct {
597 ng_item_fn *fn_fn;
598 void *fn_arg1;
599 int fn_arg2;
600 } fn;
601 } body;
602 /*
603 * Optional callback called when item is being applied,
604 * and its context.
605 */
606 ng_apply_t *apply;
607 void *context;
608 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
609 char *lastfile;
610 int lastline;
611 TAILQ_ENTRY(ng_item) all; /* all existing items */
612 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
613 };
614
615 #define NGQF_TYPE 0x03 /* MASK of content definition */
616 #define NGQF_MESG 0x00 /* the queue element is a message */
617 #define NGQF_DATA 0x01 /* the queue element is data */
618 #define NGQF_FN 0x02 /* the queue element is a function */
619 #define NGQF_UNDEF 0x03 /* UNDEFINED */
620
621 #define NGQF_RW 0x04 /* MASK for queue entry read/write */
622 #define NGQF_READER 0x04 /* queued as a reader */
623 #define NGQF_WRITER 0x00 /* queued as a writer */
624
625 /*
626 * Get the mbuf (etc) out of an item.
627 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
628 * with it, (to avoid freeing the things twice).
629 * If you don't want to zero out the item then realise that the
630 * item still owns it.
631 * Retaddr is different. There are no references on that. It's just a number.
632 * The debug versions must be either all used everywhere or not at all.
633 */
634
635 #define _NGI_M(i) ((i)->body.da_m)
636 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
637 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
638 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
639 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
640 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
641 #define _NGI_NODE(i) ((i)->el_dest)
642 #define _NGI_HOOK(i) ((i)->el_hook)
643 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
644 #define _NGI_CLR_HOOK(i) do { \
645 hook_p _hook = _NGI_HOOK(i); \
646 if (_hook) { \
647 _NG_HOOK_UNREF(_hook); \
648 _NGI_HOOK(i) = NULL; \
649 } \
650 } while (0)
651 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
652 #define _NGI_CLR_NODE(i) do { \
653 node_p _node = _NGI_NODE(i); \
654 if (_node) { \
655 _NG_NODE_UNREF(_node); \
656 _NGI_NODE(i) = NULL; \
657 } \
658 } while (0)
659
660 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
661 void dumpitem(item_p item, char *file, int line);
662 static __inline void _ngi_check(item_p item, char *file, int line) ;
663 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
664 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
665 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
666 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
667 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
668 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
669 static __inline node_p _ngi_node(item_p item, char *file, int line);
670 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
671
672 static __inline void
673 _ngi_check(item_p item, char *file, int line)
674 {
675 (item)->lastline = line;
676 (item)->lastfile = file;
677 }
678
679 static __inline struct mbuf **
680 _ngi_m(item_p item, char *file, int line)
681 {
682 _ngi_check(item, file, line);
683 return (&_NGI_M(item));
684 }
685
686 static __inline struct ng_mesg **
687 _ngi_msg(item_p item, char *file, int line)
688 {
689 _ngi_check(item, file, line);
690 return (&_NGI_MSG(item));
691 }
692
693 static __inline ng_ID_t *
694 _ngi_retaddr(item_p item, char *file, int line)
695 {
696 _ngi_check(item, file, line);
697 return (&_NGI_RETADDR(item));
698 }
699
700 static __inline ng_item_fn **
701 _ngi_fn(item_p item, char *file, int line)
702 {
703 _ngi_check(item, file, line);
704 return (&_NGI_FN(item));
705 }
706
707 static __inline void **
708 _ngi_arg1(item_p item, char *file, int line)
709 {
710 _ngi_check(item, file, line);
711 return (&_NGI_ARG1(item));
712 }
713
714 static __inline int *
715 _ngi_arg2(item_p item, char *file, int line)
716 {
717 _ngi_check(item, file, line);
718 return (&_NGI_ARG2(item));
719 }
720
721 static __inline node_p
722 _ngi_node(item_p item, char *file, int line)
723 {
724 _ngi_check(item, file, line);
725 return (_NGI_NODE(item));
726 }
727
728 static __inline hook_p
729 _ngi_hook(item_p item, char *file, int line)
730 {
731 _ngi_check(item, file, line);
732 return (_NGI_HOOK(item));
733 }
734
735 #define NGI_M(i) (*_ngi_m(i, _NN_))
736 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
737 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
738 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
739 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
740 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
741 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
742 #define NGI_NODE(i) _ngi_node(i, _NN_)
743 #define NGI_SET_HOOK(i,h) \
744 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
745 #define NGI_CLR_HOOK(i) \
746 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
747 #define NGI_SET_NODE(i,n) \
748 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
749 #define NGI_CLR_NODE(i) \
750 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
751
752 #define NG_FREE_ITEM(item) \
753 do { \
754 _ngi_check(item, _NN_); \
755 ng_free_item((item)); \
756 } while (0)
757
758 #define SAVE_LINE(item) \
759 do { \
760 (item)->lastline = __LINE__; \
761 (item)->lastfile = __FILE__; \
762 } while (0)
763
764 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
765
766 #define NGI_M(i) _NGI_M(i)
767 #define NGI_MSG(i) _NGI_MSG(i)
768 #define NGI_RETADDR(i) _NGI_RETADDR(i)
769 #define NGI_FN(i) _NGI_FN(i)
770 #define NGI_ARG1(i) _NGI_ARG1(i)
771 #define NGI_ARG2(i) _NGI_ARG2(i)
772 #define NGI_NODE(i) _NGI_NODE(i)
773 #define NGI_HOOK(i) _NGI_HOOK(i)
774 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
775 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
776 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
777 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
778
779 #define NG_FREE_ITEM(item) ng_free_item((item))
780 #define SAVE_LINE(item) do {} while (0)
781
782 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
783
784 #define NGI_GET_M(i,m) \
785 do { \
786 (m) = NGI_M(i); \
787 _NGI_M(i) = NULL; \
788 } while (0)
789
790 #define NGI_GET_MSG(i,m) \
791 do { \
792 (m) = NGI_MSG(i); \
793 _NGI_MSG(i) = NULL; \
794 } while (0)
795
796 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
797 do { \
798 (n) = NGI_NODE(i); \
799 _NGI_NODE(i) = NULL; \
800 } while (0)
801
802 #define NGI_GET_HOOK(i,h) \
803 do { \
804 (h) = NGI_HOOK(i); \
805 _NGI_HOOK(i) = NULL; \
806 } while (0)
807
808
809 /**********************************************************************
810 * Data macros. Send, manipulate and free.
811 **********************************************************************/
812 /*
813 * Assuming the data is already ok, just set the new address and send
814 */
815 #define NG_FWD_ITEM_HOOK(error, item, hook) \
816 do { \
817 (error) = \
818 ng_address_hook(NULL, (item), (hook), 0); \
819 if (error == 0) { \
820 SAVE_LINE(item); \
821 (error) = ng_snd_item((item), 0); \
822 } \
823 (item) = NULL; \
824 } while (0)
825
826 /*
827 * Forward a data packet. Mbuf pointer is updated to new value. We
828 * presume you dealt with the old one when you update it to the new one
829 * (or it maybe the old one). We got a packet and possibly had to modify
830 * the mbuf. You should probably use NGI_GET_M() if you are going to use
831 * this too.
832 */
833 #define NG_FWD_NEW_DATA(error, item, hook, m) \
834 do { \
835 NGI_M(item) = (m); \
836 (m) = NULL; \
837 NG_FWD_ITEM_HOOK(error, item, hook); \
838 } while (0)
839
840 /* Send a previously unpackaged mbuf. XXX: This should be called
841 * NG_SEND_DATA in future, but this name is kept for compatibility
842 * reasons.
843 */
844 #define NG_SEND_DATA_ONLY(error, hook, m) \
845 do { \
846 item_p _item; \
847 if ((_item = ng_package_data((m), NG_NOFLAGS))) { \
848 NG_FWD_ITEM_HOOK(error, _item, hook); \
849 } else { \
850 (error) = ENOMEM; \
851 } \
852 (m) = NULL; \
853 } while (0)
854
855 #define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m)
856
857 #define NG_FREE_MSG(msg) \
858 do { \
859 if ((msg)) { \
860 FREE((msg), M_NETGRAPH_MSG); \
861 (msg) = NULL; \
862 } \
863 } while (0)
864
865 #define NG_FREE_M(m) \
866 do { \
867 if ((m)) { \
868 m_freem((m)); \
869 (m) = NULL; \
870 } \
871 } while (0)
872
873 /*****************************************
874 * Message macros
875 *****************************************/
876
877 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
878 do { \
879 item_p _item; \
880 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
881 (msg) = NULL; \
882 (error) = ENOMEM; \
883 break; \
884 } \
885 if (((error) = ng_address_hook((here), (_item), \
886 (hook), (retaddr))) == 0) { \
887 SAVE_LINE(_item); \
888 (error) = ng_snd_item((_item), 0); \
889 } \
890 (msg) = NULL; \
891 } while (0)
892
893 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
894 do { \
895 item_p _item; \
896 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
897 (msg) = NULL; \
898 (error) = ENOMEM; \
899 break; \
900 } \
901 if (((error) = ng_address_path((here), (_item), \
902 (path), (retaddr))) == 0) { \
903 SAVE_LINE(_item); \
904 (error) = ng_snd_item((_item), 0); \
905 } \
906 (msg) = NULL; \
907 } while (0)
908
909 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
910 do { \
911 item_p _item; \
912 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
913 (msg) = NULL; \
914 (error) = ENOMEM; \
915 break; \
916 } \
917 if (((error) = ng_address_ID((here), (_item), \
918 (ID), (retaddr))) == 0) { \
919 SAVE_LINE(_item); \
920 (error) = ng_snd_item((_item), 0); \
921 } \
922 (msg) = NULL; \
923 } while (0)
924
925 /*
926 * Redirect the message to the next hop using the given hook.
927 * ng_retarget_msg() frees the item if there is an error
928 * and returns an error code. It returns 0 on success.
929 */
930 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
931 do { \
932 if (((error) = ng_address_hook((here), (item), \
933 (hook), (retaddr))) == 0) { \
934 SAVE_LINE(item); \
935 (error) = ng_snd_item((item), 0); \
936 } \
937 (item) = NULL; \
938 } while (0)
939
940 /*
941 * Send a queue item back to it's originator with a response message.
942 * Assume original message was removed and freed separatly.
943 */
944 #define NG_RESPOND_MSG(error, here, item, resp) \
945 do { \
946 if (resp) { \
947 ng_ID_t _dest = NGI_RETADDR(item); \
948 NGI_RETADDR(item) = 0; \
949 NGI_MSG(item) = resp; \
950 if ((ng_address_ID((here), (item), \
951 _dest, 0)) == 0) { \
952 SAVE_LINE(item); \
953 (error) = ng_snd_item((item), NG_QUEUE);\
954 } else { \
955 NG_FREE_ITEM(item); \
956 (error) = EINVAL; \
957 } \
958 } else { \
959 NG_FREE_ITEM(item); \
960 } \
961 (item) = NULL; \
962 } while (0)
963
964
965 /***********************************************************************
966 ******** Structures Definitions and Macros for defining a node *******
967 ***********************************************************************
968 *
969 * Here we define the structures needed to actually define a new node
970 * type.
971 */
972
973 /*
974 * Command list -- each node type specifies the command that it knows
975 * how to convert between ASCII and binary using an array of these.
976 * The last element in the array must be a terminator with cookie=0.
977 */
978
979 struct ng_cmdlist {
980 u_int32_t cookie; /* command typecookie */
981 int cmd; /* command number */
982 const char *name; /* command name */
983 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
984 const struct ng_parse_type *respType; /* args if NGF_RESP */
985 };
986
987 /*
988 * Structure of a node type
989 * If data is sent to the "rcvdata()" entrypoint then the system
990 * may decide to defer it until later by queing it with the normal netgraph
991 * input queuing system. This is decidde by the HK_QUEUE flag being set in
992 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
993 * ensure it is not requeued again.
994 * Note the input queueing system is to allow modules
995 * to 'release the stack' or to pass data across spl layers.
996 * The data will be redelivered as soon as the NETISR code runs
997 * which may be almost immediatly. A node may also do it's own queueing
998 * for other reasons (e.g. device output queuing).
999 */
1000 struct ng_type {
1001
1002 u_int32_t version; /* must equal NG_API_VERSION */
1003 const char *name; /* Unique type name */
1004 modeventhand_t mod_event; /* Module event handler (optional) */
1005 ng_constructor_t *constructor; /* Node constructor */
1006 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1007 ng_close_t *close; /* warn about forthcoming shutdown */
1008 ng_shutdown_t *shutdown; /* reset, and free resources */
1009 ng_newhook_t *newhook; /* first notification of new hook */
1010 ng_findhook_t *findhook; /* only if you have lots of hooks */
1011 ng_connect_t *connect; /* final notification of new hook */
1012 ng_rcvdata_t *rcvdata; /* data comes here */
1013 ng_disconnect_t *disconnect; /* notify on disconnect */
1014
1015 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1016
1017 /* R/W data private to the base netgraph code DON'T TOUCH! */
1018 LIST_ENTRY(ng_type) types; /* linked list of all types */
1019 int refs; /* number of instances */
1020 };
1021
1022 /*
1023 * Use the NETGRAPH_INIT() macro to link a node type into the
1024 * netgraph system. This works for types compiled into the kernel
1025 * as well as KLD modules. The first argument should be the type
1026 * name (eg, echo) and the second a pointer to the type struct.
1027 *
1028 * If a different link time is desired, e.g., a device driver that
1029 * needs to install its netgraph type before probing, use the
1030 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
1031 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
1032 */
1033
1034 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1035 static moduledata_t ng_##typename##_mod = { \
1036 "ng_" #typename, \
1037 ng_mod_event, \
1038 (typestructp) \
1039 }; \
1040 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1041 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1042 NG_ABI_VERSION, \
1043 NG_ABI_VERSION)
1044
1045 #define NETGRAPH_INIT(tn, tp) \
1046 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1047
1048 /* Special malloc() type for netgraph structs and ctrl messages */
1049 /* Only these two types should be visible to nodes */
1050 MALLOC_DECLARE(M_NETGRAPH);
1051 MALLOC_DECLARE(M_NETGRAPH_MSG);
1052
1053 /* declare the base of the netgraph sysclt hierarchy */
1054 /* but only if this file cares about sysctls */
1055 #ifdef SYSCTL_DECL
1056 SYSCTL_DECL(_net_graph);
1057 #endif
1058
1059 /*
1060 * Methods that the nodes can use.
1061 * Many of these methods should usually NOT be used directly but via
1062 * Macros above.
1063 */
1064 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1065 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1066 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1067 int ng_bypass(hook_p hook1, hook_p hook2);
1068 hook_p ng_findhook(node_p node, const char *name);
1069 struct ng_type *ng_findtype(const char *type);
1070 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1071 int ng_name_node(node_p node, const char *name);
1072 int ng_newtype(struct ng_type *tp);
1073 ng_ID_t ng_node2ID(node_p node);
1074 item_p ng_package_data(struct mbuf *m, int flags);
1075 item_p ng_package_msg(struct ng_mesg *msg, int flags);
1076 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1077 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1078 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1079 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1080 int ng_rmtype(struct ng_type *tp);
1081 int ng_snd_item(item_p item, int queue);
1082 int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn,
1083 void *arg1, int arg2, int flags);
1084 #define ng_send_fn(node, hook, fn, arg1, arg2) \
1085 ng_send_fn1(node, hook, fn, arg1, arg2, NG_NOFLAGS)
1086 int ng_uncallout(struct callout *c, node_p node);
1087 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1088 ng_item_fn *fn, void * arg1, int arg2);
1089 #define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE)
1090
1091 /* Flags for netgraph functions. */
1092 #define NG_NOFLAGS 0x00000000 /* no special options */
1093 #define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */
1094 #define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */
1095 #define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */
1096
1097 /*
1098 * prototypes the user should DEFINITELY not use directly
1099 */
1100 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1101 int ng_mod_event(module_t mod, int what, void *arg);
1102
1103 /*
1104 * Tag definitions and constants
1105 */
1106
1107 #define NG_TAG_PRIO 1
1108
1109 struct ng_tag_prio {
1110 struct m_tag tag;
1111 char priority;
1112 char discardability;
1113 };
1114
1115 #define NG_PRIO_CUTOFF 32
1116 #define NG_PRIO_LINKSTATE 64
1117
1118 /* Macros and declarations to keep compatibility with metadata, which
1119 * is obsoleted now. To be deleted.
1120 */
1121 typedef void *meta_p;
1122 #define _NGI_META(i) NULL
1123 #define NGI_META(i) NULL
1124 #define NG_FREE_META(meta)
1125 #define NGI_GET_META(i,m)
1126 #define ng_copy_meta(meta) NULL
1127
1128 #endif /* _NETGRAPH_NETGRAPH_H_ */
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