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/5.2/sys/netgraph/netgraph.h 122548 2003-11-12 09:10:11Z harti $
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 7
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_shutdown_t(node_p node);
87 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
88 typedef hook_p ng_findhook_t(node_p node, const char *name);
89 typedef int ng_connect_t(hook_p hook);
90 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
91 typedef int ng_rcvdata_t(hook_p hook, item_p item);
92 typedef int ng_disconnect_t(hook_p hook);
93 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item);
94
95 /***********************************************************************
96 ***************** Hook Structure and Methods **************************
97 ***********************************************************************
98 *
99 * Structure of a hook
100 */
101 struct ng_hook {
102 char hk_name[NG_HOOKLEN+1]; /* what this node knows this link as */
103 void *hk_private; /* node dependant ID for this hook */
104 int hk_flags; /* info about this hook/link */
105 int hk_refs; /* dont actually free this till 0 */
106 struct ng_hook *hk_peer; /* the other end of this link */
107 struct ng_node *hk_node; /* The node this hook is attached to */
108 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
109 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
110 ng_rcvdata_t *hk_rcvdata; /* data comes here */
111 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
112 #define HK_MAGIC 0x78573011
113 int hk_magic;
114 char *lastfile;
115 int lastline;
116 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
117 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
118 };
119 /* Flags for a hook */
120 #define HK_INVALID 0x0001 /* don't trust it! */
121 #define HK_QUEUE 0x0002 /* queue for later delivery */
122 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
123 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
124
125 /*
126 * Public Methods for hook
127 * If you can't do it with these you probably shouldn;t be doing it.
128 */
129 void ng_unref_hook(hook_p hook); /* don't move this */
130 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1)
131 #define _NG_HOOK_NAME(hook) ((hook)->hk_name)
132 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
133 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
134 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
135 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
136 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
137 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
138 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
139 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
140 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
141 #define _NG_HOOK_FORCE_WRITER(hook) \
142 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
143 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
144
145 /* Some shortcuts */
146 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
147 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
148 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
149
150 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
151 #define _NN_ __FILE__,__LINE__
152 void dumphook (hook_p hook, char *file, int line);
153 static __inline void _chkhook(hook_p hook, char *file, int line);
154 static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
155 static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
156 static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
157 static __inline void _ng_hook_set_private(hook_p hook,
158 void * val, char * file, int line);
159 static __inline void _ng_hook_set_rcvmsg(hook_p hook,
160 ng_rcvmsg_t *val, char * file, int line);
161 static __inline void _ng_hook_set_rcvdata(hook_p hook,
162 ng_rcvdata_t *val, char * file, int line);
163 static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
164 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
165 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
166 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
167 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
168 static __inline void _ng_hook_force_writer(hook_p hook, char * file,
169 int line);
170 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line);
171
172 static void __inline
173 _chkhook(hook_p hook, char *file, int line)
174 {
175 if (hook->hk_magic != HK_MAGIC) {
176 printf("Accessing freed hook ");
177 dumphook(hook, file, line);
178 }
179 hook->lastline = line;
180 hook->lastfile = file;
181 }
182
183 static __inline void
184 _ng_hook_ref(hook_p hook, char * file, int line)
185 {
186 _chkhook(hook, file, line);
187 _NG_HOOK_REF(hook);
188 }
189
190 static __inline char *
191 _ng_hook_name(hook_p hook, char * file, int line)
192 {
193 _chkhook(hook, file, line);
194 return (_NG_HOOK_NAME(hook));
195 }
196
197 static __inline void
198 _ng_hook_unref(hook_p hook, char * file, int line)
199 {
200 _chkhook(hook, file, line);
201 _NG_HOOK_UNREF(hook);
202 }
203
204 static __inline void
205 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
206 {
207 _chkhook(hook, file, line);
208 _NG_HOOK_SET_PRIVATE(hook, val);
209 }
210
211 static __inline void
212 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
213 {
214 _chkhook(hook, file, line);
215 _NG_HOOK_SET_RCVMSG(hook, val);
216 }
217
218 static __inline void
219 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
220 {
221 _chkhook(hook, file, line);
222 _NG_HOOK_SET_RCVDATA(hook, val);
223 }
224
225 static __inline void *
226 _ng_hook_private(hook_p hook, char * file, int line)
227 {
228 _chkhook(hook, file, line);
229 return (_NG_HOOK_PRIVATE(hook));
230 }
231
232 static __inline int
233 _ng_hook_not_valid(hook_p hook, char * file, int line)
234 {
235 _chkhook(hook, file, line);
236 return (_NG_HOOK_NOT_VALID(hook));
237 }
238
239 static __inline int
240 _ng_hook_is_valid(hook_p hook, char * file, int line)
241 {
242 _chkhook(hook, file, line);
243 return (_NG_HOOK_IS_VALID(hook));
244 }
245
246 static __inline node_p
247 _ng_hook_node(hook_p hook, char * file, int line)
248 {
249 _chkhook(hook, file, line);
250 return (_NG_HOOK_NODE(hook));
251 }
252
253 static __inline hook_p
254 _ng_hook_peer(hook_p hook, char * file, int line)
255 {
256 _chkhook(hook, file, line);
257 return (_NG_HOOK_PEER(hook));
258 }
259
260 static __inline void
261 _ng_hook_force_writer(hook_p hook, char * file, int line)
262 {
263 _chkhook(hook, file, line);
264 _NG_HOOK_FORCE_WRITER(hook);
265 }
266
267 static __inline void
268 _ng_hook_force_queue(hook_p hook, char * file, int line)
269 {
270 _chkhook(hook, file, line);
271 _NG_HOOK_FORCE_QUEUE(hook);
272 }
273
274
275 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
276 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
277 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
278 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
279 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
280 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
281 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
282 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
283 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
284 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
285 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
286 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
287 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
288
289 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
290
291 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
292 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
293 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
294 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
295 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
296 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
297 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
298 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
299 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
300 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
301 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
302 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
303 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
304
305 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
306
307 /***********************************************************************
308 ***************** Node Structure and Methods **************************
309 ***********************************************************************
310 * Structure of a node
311 * including the eembedded queue structure.
312 *
313 * The structure for queueing Netgraph request items
314 * embedded in the node structure
315 */
316 struct ng_queue {
317 u_long q_flags;
318 struct mtx q_mtx;
319 item_p queue;
320 item_p *last;
321 struct ng_node *q_node; /* find the front of the node.. */
322 };
323
324 struct ng_node {
325 char nd_name[NG_NODELEN+1]; /* optional globally unique name */
326 struct ng_type *nd_type; /* the installed 'type' */
327 int nd_flags; /* see below for bit definitions */
328 int nd_refs; /* # of references to this node */
329 int nd_numhooks; /* number of hooks */
330 void *nd_private; /* node type dependant node ID */
331 ng_ID_t nd_ID; /* Unique per node */
332 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
333 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */
334 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
335 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */
336 struct ng_queue nd_input_queue; /* input queue for locking */
337 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
338 #define ND_MAGIC 0x59264837
339 int nd_magic;
340 char *lastfile;
341 int lastline;
342 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
343 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
344 };
345
346 /* Flags for a node */
347 #define NG_INVALID 0x00000001 /* free when refs go to 0 */
348 #define NG_WORKQ 0x00000002 /* node is on the work queue */
349 #define NG_FORCE_WRITER 0x00000004 /* Never multithread this node */
350 #define NG_CLOSING 0x00000008 /* ng_rmnode() at work */
351 #define NG_REALLY_DIE 0x00000010 /* "persistant" node is unloading */
352 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
353 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
354 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
355 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
356
357 /*
358 * Public methods for nodes.
359 * If you can't do it with these you probably shouldn't be doing it.
360 */
361 int ng_unref_node(node_p node); /* don't move this */
362 #define _NG_NODE_NAME(node) ((node)->nd_name + 0)
363 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
364 #define _NG_NODE_ID(node) ((node)->nd_ID + 0)
365 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1)
366 #define _NG_NODE_UNREF(node) ng_unref_node(node)
367 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
368 #define _NG_NODE_PRIVATE(node) ((node)->nd_private)
369 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NG_INVALID))
370 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NG_INVALID)
371 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
372 #define _NG_NODE_FORCE_WRITER(node) \
373 do{ node->nd_flags |= NG_FORCE_WRITER; }while (0)
374 #define _NG_NODE_REALLY_DIE(node) \
375 do{ node->nd_flags |= (NG_REALLY_DIE|NG_INVALID); }while (0)
376 /*
377 * The hook iterator.
378 * This macro will call a function of type ng_fn_eachhook for each
379 * hook attached to the node. If the function returns 0, then the
380 * iterator will stop and return a pointer to the hook that returned 0.
381 */
382 typedef int ng_fn_eachhook(hook_p hook, void* arg);
383 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
384 do { \
385 hook_p _hook; \
386 (rethook) = NULL; \
387 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
388 if ((fn)(_hook, arg) == 0) { \
389 (rethook) = _hook; \
390 break; \
391 } \
392 } \
393 } while (0)
394
395 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
396 void dumpnode(node_p node, char *file, int line);
397 static void __inline _chknode(node_p node, char *file, int line);
398 static __inline char * _ng_node_name(node_p node, char *file, int line);
399 static __inline int _ng_node_has_name(node_p node, char *file, int line);
400 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
401 void ng_ref_node(node_p node);
402 static __inline void _ng_node_ref(node_p node, char *file, int line);
403 static __inline int _ng_node_unref(node_p node, char *file, int line);
404 static __inline void _ng_node_set_private(node_p node, void * val,
405 char *file, int line);
406 static __inline void * _ng_node_private(node_p node, char *file, int line);
407 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
408 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
409 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
410 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
411 static __inline hook_p _ng_node_foreach_hook(node_p node,
412 ng_fn_eachhook *fn, void *arg, char *file, int line);
413
414 static void __inline
415 _chknode(node_p node, char *file, int line)
416 {
417 if (node->nd_magic != ND_MAGIC) {
418 printf("Accessing freed node ");
419 dumpnode(node, file, line);
420 }
421 node->lastline = line;
422 node->lastfile = file;
423 }
424
425 static __inline char *
426 _ng_node_name(node_p node, char *file, int line)
427 {
428 _chknode(node, file, line);
429 return(_NG_NODE_NAME(node));
430 }
431
432 static __inline int
433 _ng_node_has_name(node_p node, char *file, int line)
434 {
435 _chknode(node, file, line);
436 return(_NG_NODE_HAS_NAME(node));
437 }
438
439 static __inline ng_ID_t
440 _ng_node_id(node_p node, char *file, int line)
441 {
442 _chknode(node, file, line);
443 return(_NG_NODE_ID(node));
444 }
445
446 static __inline void
447 _ng_node_ref(node_p node, char *file, int line)
448 {
449 _chknode(node, file, line);
450 /*_NG_NODE_REF(node);*/
451 ng_ref_node(node);
452 }
453
454 static __inline int
455 _ng_node_unref(node_p node, char *file, int line)
456 {
457 _chknode(node, file, line);
458 return (_NG_NODE_UNREF(node));
459 }
460
461 static __inline void
462 _ng_node_set_private(node_p node, void * val, char *file, int line)
463 {
464 _chknode(node, file, line);
465 _NG_NODE_SET_PRIVATE(node, val);
466 }
467
468 static __inline void *
469 _ng_node_private(node_p node, char *file, int line)
470 {
471 _chknode(node, file, line);
472 return (_NG_NODE_PRIVATE(node));
473 }
474
475 static __inline int
476 _ng_node_is_valid(node_p node, char *file, int line)
477 {
478 _chknode(node, file, line);
479 return(_NG_NODE_IS_VALID(node));
480 }
481
482 static __inline int
483 _ng_node_not_valid(node_p node, char *file, int line)
484 {
485 _chknode(node, file, line);
486 return(_NG_NODE_NOT_VALID(node));
487 }
488
489 static __inline int
490 _ng_node_numhooks(node_p node, char *file, int line)
491 {
492 _chknode(node, file, line);
493 return(_NG_NODE_NUMHOOKS(node));
494 }
495
496 static __inline void
497 _ng_node_force_writer(node_p node, char *file, int line)
498 {
499 _chknode(node, file, line);
500 _NG_NODE_FORCE_WRITER(node);
501 }
502
503 static __inline void
504 _ng_node_really_die(node_p node, char *file, int line)
505 {
506 _chknode(node, file, line);
507 _NG_NODE_REALLY_DIE(node);
508 }
509
510 static __inline hook_p
511 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
512 char *file, int line)
513 {
514 hook_p hook;
515 _chknode(node, file, line);
516 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
517 return (hook);
518 }
519
520 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
521 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
522 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
523 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
524 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
525 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
526 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
527 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
528 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
529 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
530 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
531 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
532 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
533 do { \
534 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
535 } while (0)
536
537 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
538
539 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
540 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
541 #define NG_NODE_ID(node) _NG_NODE_ID(node)
542 #define NG_NODE_REF(node) _NG_NODE_REF(node)
543 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
544 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
545 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
546 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
547 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
548 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
549 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
550 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
551 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
552 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
553 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
554
555 /***********************************************************************
556 ***************** Meta Data Structures and Methods ********************
557 ***********************************************************************
558 *
559 * The structure that holds meta_data about a data packet (e.g. priority)
560 * Nodes might add or subtract options as needed if there is room.
561 * They might reallocate the struct to make more room if they need to.
562 * Meta-data is still experimental.
563 */
564 struct meta_field_header {
565 u_long cookie; /* cookie for the field. Skip fields you don't
566 * know about (same cookie as in messgaes) */
567 u_short type; /* field ID */
568 u_short len; /* total len of this field including extra
569 * data */
570 char data[0]; /* data starts here */
571 };
572
573 /* To zero out an option 'in place' set it's cookie to this */
574 #define NGM_INVALID_COOKIE 865455152
575
576 /* This part of the metadata is always present if the pointer is non NULL */
577 struct ng_meta {
578 char priority; /* -ve is less priority, 0 is default */
579 char discardability; /* higher is less valuable.. discard first */
580 u_short allocated_len; /* amount malloc'd */
581 u_short used_len; /* sum of all fields, options etc. */
582 u_short flags; /* see below.. generic flags */
583 struct meta_field_header options[0]; /* add as (if) needed */
584 };
585 typedef struct ng_meta *meta_p;
586
587 /* Flags for meta-data */
588 #define NGMF_TEST 0x01 /* discard at the last moment before sending */
589 #define NGMF_TRACE 0x02 /* trace when handing this data to a node */
590
591 /***********************************************************************
592 ************* Node Queue and Item Structures and Methods **************
593 ***********************************************************************
594 *
595 */
596 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
597 struct ng_item {
598 u_long el_flags;
599 item_p el_next;
600 node_p el_dest; /* The node it will be applied against (or NULL) */
601 hook_p el_hook; /* Entering hook. Optional in Control messages */
602 union {
603 struct {
604 struct mbuf *da_m;
605 meta_p da_meta;
606 } data;
607 struct {
608 struct ng_mesg *msg_msg;
609 ng_ID_t msg_retaddr;
610 } msg;
611 struct {
612 ng_item_fn *fn_fn;
613 void *fn_arg1;
614 int fn_arg2;
615 } fn;
616 } body;
617 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
618 char *lastfile;
619 int lastline;
620 TAILQ_ENTRY(ng_item) all; /* all existing items */
621 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
622 };
623
624 #define NGQF_TYPE 0x03 /* MASK of content definition */
625 #define NGQF_MESG 0x00 /* the queue element is a message */
626 #define NGQF_DATA 0x01 /* the queue element is data */
627 #define NGQF_FN 0x02 /* the queue element is a function */
628 #define NGQF_UNDEF 0x03 /* UNDEFINED */
629
630 #define NGQF_RW 0x04 /* MASK for queue entry read/write */
631 #define NGQF_READER 0x04 /* queued as a reader */
632 #define NGQF_WRITER 0x00 /* queued as a writer */
633
634 #define NGQF_FREE 0x08
635
636 /*
637 * Get the mbuf (etc) out of an item.
638 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
639 * with it, (to avoid freeing the things twice).
640 * If you don't want to zero out the item then realise that the
641 * item still owns it.
642 * Retaddr is different. There are no references on that. It's just a number.
643 * The debug versions must be either all used everywhere or not at all.
644 */
645
646 #define _NGI_M(i) ((i)->body.data.da_m)
647 #define _NGI_META(i) ((i)->body.data.da_meta)
648 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
649 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
650 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
651 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
652 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
653 #define _NGI_NODE(i) ((i)->el_dest)
654 #define _NGI_HOOK(i) ((i)->el_hook)
655 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
656 #define _NGI_CLR_HOOK(i) do { \
657 hook_p _hook = _NGI_HOOK(i); \
658 if (_hook) { \
659 _NG_HOOK_UNREF(_hook); \
660 _NGI_HOOK(i) = NULL; \
661 } \
662 } while (0)
663 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
664 #define _NGI_CLR_NODE(i) do { \
665 node_p _node = _NGI_NODE(i); \
666 if (_node) { \
667 _NG_NODE_UNREF(_node); \
668 _NGI_NODE(i) = NULL; \
669 } \
670 } while (0)
671
672 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
673 void dumpitem(item_p item, char *file, int line);
674 static __inline void _ngi_check(item_p item, char *file, int line) ;
675 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
676 static __inline meta_p * _ngi_meta(item_p item, char *file, int line) ;
677 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
678 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
679 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
680 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
681 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
682 static __inline node_p _ngi_node(item_p item, char *file, int line);
683 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
684
685 static __inline void
686 _ngi_check(item_p item, char *file, int line)
687 {
688 if (item->el_flags & NGQF_FREE) {
689 dumpitem(item, file, line);
690 panic ("free item!");
691 }
692 (item)->lastline = line;
693 (item)->lastfile = file;
694 }
695
696 static __inline struct mbuf **
697 _ngi_m(item_p item, char *file, int line)
698 {
699 _ngi_check(item, file, line);
700 return (&_NGI_M(item));
701 }
702
703 static __inline meta_p *
704 _ngi_meta(item_p item, char *file, int line)
705 {
706 _ngi_check(item, file, line);
707 return (&_NGI_META(item));
708 }
709
710 static __inline struct ng_mesg **
711 _ngi_msg(item_p item, char *file, int line)
712 {
713 _ngi_check(item, file, line);
714 return (&_NGI_MSG(item));
715 }
716
717 static __inline ng_ID_t *
718 _ngi_retaddr(item_p item, char *file, int line)
719 {
720 _ngi_check(item, file, line);
721 return (&_NGI_RETADDR(item));
722 }
723
724 static __inline ng_item_fn **
725 _ngi_fn(item_p item, char *file, int line)
726 {
727 _ngi_check(item, file, line);
728 return (&_NGI_FN(item));
729 }
730
731 static __inline void **
732 _ngi_arg1(item_p item, char *file, int line)
733 {
734 _ngi_check(item, file, line);
735 return (&_NGI_ARG1(item));
736 }
737
738 static __inline int *
739 _ngi_arg2(item_p item, char *file, int line)
740 {
741 _ngi_check(item, file, line);
742 return (&_NGI_ARG2(item));
743 }
744
745 static __inline node_p
746 _ngi_node(item_p item, char *file, int line)
747 {
748 _ngi_check(item, file, line);
749 return (_NGI_NODE(item));
750 }
751
752 static __inline hook_p
753 _ngi_hook(item_p item, char *file, int line)
754 {
755 _ngi_check(item, file, line);
756 return (_NGI_HOOK(item));
757 }
758
759 #define NGI_M(i) (*_ngi_m(i, _NN_))
760 #define NGI_META(i) (*_ngi_meta(i, _NN_))
761 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
762 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
763 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
764 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
765 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
766 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
767 #define NGI_NODE(i) _ngi_node(i, _NN_)
768 #define NGI_SET_HOOK(i,h) \
769 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
770 #define NGI_CLR_HOOK(i) \
771 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
772 #define NGI_SET_NODE(i,n) \
773 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
774 #define NGI_CLR_NODE(i) \
775 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
776
777 #define NG_FREE_ITEM(item) \
778 do { \
779 _ngi_check(item, _NN_); \
780 ng_free_item((item)); \
781 } while (0)
782
783 #define SAVE_LINE(item) \
784 do { \
785 (item)->lastline = __LINE__; \
786 (item)->lastfile = __FILE__; \
787 } while (0)
788
789 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
790
791 #define NGI_M(i) _NGI_M(i)
792 #define NGI_META(i) _NGI_META(i)
793 #define NGI_MSG(i) _NGI_MSG(i)
794 #define NGI_RETADDR(i) _NGI_RETADDR(i)
795 #define NGI_FN(i) _NGI_FN(i)
796 #define NGI_ARG1(i) _NGI_ARG1(i)
797 #define NGI_ARG2(i) _NGI_ARG2(i)
798 #define NGI_NODE(i) _NGI_NODE(i)
799 #define NGI_HOOK(i) _NGI_HOOK(i)
800 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
801 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
802 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
803 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
804
805 #define NG_FREE_ITEM(item) ng_free_item((item))
806 #define SAVE_LINE(item) do {} while (0)
807
808 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
809
810 #define NGI_GET_M(i,m) \
811 do { \
812 (m) = NGI_M(i); \
813 _NGI_M(i) = NULL; \
814 } while (0)
815
816 #define NGI_GET_META(i,m) \
817 do { \
818 (m) = NGI_META(i); \
819 _NGI_META(i) = NULL; \
820 } while (0)
821
822 #define NGI_GET_MSG(i,m) \
823 do { \
824 (m) = NGI_MSG(i); \
825 _NGI_MSG(i) = NULL; \
826 } while (0)
827
828 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
829 do { \
830 (n) = NGI_NODE(i); \
831 _NGI_NODE(i) = NULL; \
832 } while (0)
833
834 #define NGI_GET_HOOK(i,h) \
835 do { \
836 (h) = NGI_HOOK(i); \
837 _NGI_HOOK(i) = NULL; \
838 } while (0)
839
840
841 /**********************************************************************
842 * Data macros. Send, manipulate and free.
843 **********************************************************************/
844 /*
845 * Assuming the data is already ok, just set the new address and send
846 */
847 #define NG_FWD_ITEM_HOOK(error, item, hook) \
848 do { \
849 (error) = \
850 ng_address_hook(NULL, (item), (hook), 0); \
851 if (error == 0) { \
852 SAVE_LINE(item); \
853 (error) = ng_snd_item((item), 0); \
854 } \
855 (item) = NULL; \
856 } while (0)
857
858 /*
859 * Forward a data packet with no new meta-data.
860 * old metadata is passed along without change.
861 * Mbuf pointer is updated to new value. We presume you dealt with the
862 * old one when you update it to the new one (or it maybe the old one).
863 * We got a packet and possibly had to modify the mbuf.
864 * You should probably use NGI_GET_M() if you are going to use this too
865 */
866 #define NG_FWD_NEW_DATA(error, item, hook, m) \
867 do { \
868 NGI_M(item) = (m); \
869 (m) = NULL; \
870 NG_FWD_ITEM_HOOK(error, item, hook); \
871 } while (0)
872
873 /* Send a previously unpackaged mbuf when we have no metadata to send */
874 #define NG_SEND_DATA_ONLY(error, hook, m) \
875 do { \
876 item_p _item; \
877 if ((_item = ng_package_data((m), NULL))) { \
878 NG_FWD_ITEM_HOOK(error, _item, hook); \
879 } else { \
880 (error) = ENOMEM; \
881 } \
882 (m) = NULL; \
883 } while (0)
884
885 /* Send previously unpackeged data and metadata. */
886 #define NG_SEND_DATA(error, hook, m, meta) \
887 do { \
888 item_p _item; \
889 if ((_item = ng_package_data((m), (meta)))) { \
890 NG_FWD_ITEM_HOOK(error, _item, hook); \
891 } else { \
892 (error) = ENOMEM; \
893 } \
894 (m) = NULL; \
895 (meta) = NULL; \
896 } while (0)
897
898 #define NG_FREE_MSG(msg) \
899 do { \
900 if ((msg)) { \
901 FREE((msg), M_NETGRAPH_MSG); \
902 (msg) = NULL; \
903 } \
904 } while (0)
905
906 #define NG_FREE_META(meta) \
907 do { \
908 if ((meta)) { \
909 FREE((meta), M_NETGRAPH_META); \
910 (meta) = NULL; \
911 } \
912 } while (0)
913
914 #define NG_FREE_M(m) \
915 do { \
916 if ((m)) { \
917 m_freem((m)); \
918 (m) = NULL; \
919 } \
920 } while (0)
921
922 /*****************************************
923 * Message macros
924 *****************************************/
925
926 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
927 do { \
928 item_p _item; \
929 if ((_item = ng_package_msg(msg)) == NULL) { \
930 (msg) = NULL; \
931 (error) = ENOMEM; \
932 break; \
933 } \
934 if (((error) = ng_address_hook((here), (_item), \
935 (hook), (retaddr))) == 0) { \
936 SAVE_LINE(_item); \
937 (error) = ng_snd_item((_item), 0); \
938 } \
939 (msg) = NULL; \
940 } while (0)
941
942 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
943 do { \
944 item_p _item; \
945 if ((_item = ng_package_msg(msg)) == NULL) { \
946 (msg) = NULL; \
947 (error) = ENOMEM; \
948 break; \
949 } \
950 if (((error) = ng_address_path((here), (_item), \
951 (path), (retaddr))) == 0) { \
952 SAVE_LINE(_item); \
953 (error) = ng_snd_item((_item), 0); \
954 } \
955 (msg) = NULL; \
956 } while (0)
957
958 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
959 do { \
960 item_p _item; \
961 if ((_item = ng_package_msg(msg)) == NULL) { \
962 (msg) = NULL; \
963 (error) = ENOMEM; \
964 break; \
965 } \
966 if (((error) = ng_address_ID((here), (_item), \
967 (ID), (retaddr))) == 0) { \
968 SAVE_LINE(_item); \
969 (error) = ng_snd_item((_item), 0); \
970 } \
971 (msg) = NULL; \
972 } while (0)
973
974 /*
975 * Redirect the message to the next hop using the given hook.
976 * ng_retarget_msg() frees the item if there is an error
977 * and returns an error code. It returns 0 on success.
978 */
979 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
980 do { \
981 if (((error) = ng_address_hook((here), (item), \
982 (hook), (retaddr))) == 0) { \
983 SAVE_LINE(item); \
984 (error) = ng_snd_item((item), 0); \
985 } \
986 (item) = NULL; \
987 } while (0)
988
989 /*
990 * Send a queue item back to it's originator with a response message.
991 * Assume original message was removed and freed separatly.
992 */
993 #define NG_RESPOND_MSG(error, here, item, resp) \
994 do { \
995 if (resp) { \
996 ng_ID_t _dest = NGI_RETADDR(item); \
997 NGI_RETADDR(item) = 0; \
998 NGI_MSG(item) = resp; \
999 if ((ng_address_ID((here), (item), \
1000 _dest, 0)) == 0) { \
1001 SAVE_LINE(item); \
1002 (error) = ng_snd_item((item), 1); \
1003 } else { \
1004 (error) = EINVAL; \
1005 } \
1006 } else { \
1007 NG_FREE_ITEM(item); \
1008 } \
1009 (item) = NULL; \
1010 } while (0)
1011
1012
1013 /***********************************************************************
1014 ******** Structures Definitions and Macros for defining a node *******
1015 ***********************************************************************
1016 *
1017 * Here we define the structures needed to actually define a new node
1018 * type.
1019 */
1020
1021 /*
1022 * Command list -- each node type specifies the command that it knows
1023 * how to convert between ASCII and binary using an array of these.
1024 * The last element in the array must be a terminator with cookie=0.
1025 */
1026
1027 struct ng_cmdlist {
1028 u_int32_t cookie; /* command typecookie */
1029 int cmd; /* command number */
1030 const char *name; /* command name */
1031 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
1032 const struct ng_parse_type *respType; /* args if NGF_RESP */
1033 };
1034
1035 /*
1036 * Structure of a node type
1037 * If data is sent to the "rcvdata()" entrypoint then the system
1038 * may decide to defer it until later by queing it with the normal netgraph
1039 * input queuing system. This is decidde by the HK_QUEUE flag being set in
1040 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1041 * ensure it is not requeued again.
1042 * Note the input queueing system is to allow modules
1043 * to 'release the stack' or to pass data across spl layers.
1044 * The data will be redelivered as soon as the NETISR code runs
1045 * which may be almost immediatly. A node may also do it's own queueing
1046 * for other reasons (e.g. device output queuing).
1047 */
1048 struct ng_type {
1049
1050 u_int32_t version; /* must equal NG_API_VERSION */
1051 const char *name; /* Unique type name */
1052 modeventhand_t mod_event; /* Module event handler (optional) */
1053 ng_constructor_t *constructor; /* Node constructor */
1054 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1055 ng_shutdown_t *shutdown; /* reset, and free resources */
1056 ng_newhook_t *newhook; /* first notification of new hook */
1057 ng_findhook_t *findhook; /* only if you have lots of hooks */
1058 ng_connect_t *connect; /* final notification of new hook */
1059 ng_rcvdata_t *rcvdata; /* data comes here */
1060 ng_disconnect_t *disconnect; /* notify on disconnect */
1061
1062 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1063
1064 /* R/W data private to the base netgraph code DON'T TOUCH! */
1065 LIST_ENTRY(ng_type) types; /* linked list of all types */
1066 int refs; /* number of instances */
1067 };
1068
1069 /*
1070 * Use the NETGRAPH_INIT() macro to link a node type into the
1071 * netgraph system. This works for types compiled into the kernel
1072 * as well as KLD modules. The first argument should be the type
1073 * name (eg, echo) and the second a pointer to the type struct.
1074 *
1075 * If a different link time is desired, e.g., a device driver that
1076 * needs to install its netgraph type before probing, use the
1077 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
1078 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
1079 */
1080
1081 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1082 static moduledata_t ng_##typename##_mod = { \
1083 "ng_" #typename, \
1084 ng_mod_event, \
1085 (typestructp) \
1086 }; \
1087 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1088 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1089 NG_ABI_VERSION, \
1090 NG_ABI_VERSION)
1091
1092 #define NETGRAPH_INIT(tn, tp) \
1093 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1094
1095 /* Special malloc() type for netgraph structs and ctrl messages */
1096 /* Only these two types should be visible to nodes */
1097 MALLOC_DECLARE(M_NETGRAPH);
1098 MALLOC_DECLARE(M_NETGRAPH_MSG);
1099 MALLOC_DECLARE(M_NETGRAPH_META);
1100
1101 /* declare the base of the netgraph sysclt hierarchy */
1102 /* but only if this file cares about sysctls */
1103 #ifdef SYSCTL_DECL
1104 SYSCTL_DECL(_net_graph);
1105 #endif
1106
1107 /*
1108 * Methods that the nodes can use.
1109 * Many of these methods should usually NOT be used directly but via
1110 * Macros above.
1111 */
1112 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1113 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1114 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1115 meta_p ng_copy_meta(meta_p meta);
1116 hook_p ng_findhook(node_p node, const char *name);
1117 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1118 int ng_name_node(node_p node, const char *name);
1119 int ng_newtype(struct ng_type *tp);
1120 ng_ID_t ng_node2ID(node_p node);
1121 item_p ng_package_data(struct mbuf *m, meta_p meta);
1122 item_p ng_package_msg(struct ng_mesg *msg);
1123 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1124 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1125 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1126 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1127 int ng_rmtype(struct ng_type *tp);
1128 int ng_snd_item(item_p item, int queue);
1129 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn,
1130 void *arg1, int arg2);
1131 int ng_untimeout(struct callout_handle handle, node_p node);
1132 struct callout_handle
1133 ng_timeout(node_p node, hook_p hook, int ticks,
1134 ng_item_fn *fn, void * arg1, int arg2);
1135
1136 /*
1137 * prototypes the user should DEFINITLY not use directly
1138 */
1139 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1140 int ng_mod_event(module_t mod, int what, void *arg);
1141
1142 #endif /* _NETGRAPH_NETGRAPH_H_ */
1143
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