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/6.1/sys/netgraph/netgraph.h 154614 2006-01-21 10:00:51Z glebius $
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 static __inline void _ng_node_ref(node_p node, char *file, int line);
415 static __inline int _ng_node_unref(node_p node, char *file, int line);
416 static __inline void _ng_node_set_private(node_p node, void * val,
417 char *file, int line);
418 static __inline void * _ng_node_private(node_p node, char *file, int line);
419 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
420 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
421 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
422 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
423 static __inline hook_p _ng_node_foreach_hook(node_p node,
424 ng_fn_eachhook *fn, void *arg, char *file, int line);
425 static __inline void _ng_node_revive(node_p node, char *file, int line);
426
427 static __inline void
428 _chknode(node_p node, char *file, int line)
429 {
430 if (node->nd_magic != ND_MAGIC) {
431 printf("Accessing freed node ");
432 dumpnode(node, file, line);
433 }
434 node->lastline = line;
435 node->lastfile = file;
436 }
437
438 static __inline char *
439 _ng_node_name(node_p node, char *file, int line)
440 {
441 _chknode(node, file, line);
442 return(_NG_NODE_NAME(node));
443 }
444
445 static __inline int
446 _ng_node_has_name(node_p node, char *file, int line)
447 {
448 _chknode(node, file, line);
449 return(_NG_NODE_HAS_NAME(node));
450 }
451
452 static __inline ng_ID_t
453 _ng_node_id(node_p node, char *file, int line)
454 {
455 _chknode(node, file, line);
456 return(_NG_NODE_ID(node));
457 }
458
459 static __inline void
460 _ng_node_ref(node_p node, char *file, int line)
461 {
462 _chknode(node, file, line);
463 _NG_NODE_REF(node);
464 }
465
466 static __inline int
467 _ng_node_unref(node_p node, char *file, int line)
468 {
469 _chknode(node, file, line);
470 return (_NG_NODE_UNREF(node));
471 }
472
473 static __inline void
474 _ng_node_set_private(node_p node, void * val, char *file, int line)
475 {
476 _chknode(node, file, line);
477 _NG_NODE_SET_PRIVATE(node, val);
478 }
479
480 static __inline void *
481 _ng_node_private(node_p node, char *file, int line)
482 {
483 _chknode(node, file, line);
484 return (_NG_NODE_PRIVATE(node));
485 }
486
487 static __inline int
488 _ng_node_is_valid(node_p node, char *file, int line)
489 {
490 _chknode(node, file, line);
491 return(_NG_NODE_IS_VALID(node));
492 }
493
494 static __inline int
495 _ng_node_not_valid(node_p node, char *file, int line)
496 {
497 _chknode(node, file, line);
498 return(_NG_NODE_NOT_VALID(node));
499 }
500
501 static __inline int
502 _ng_node_numhooks(node_p node, char *file, int line)
503 {
504 _chknode(node, file, line);
505 return(_NG_NODE_NUMHOOKS(node));
506 }
507
508 static __inline void
509 _ng_node_force_writer(node_p node, char *file, int line)
510 {
511 _chknode(node, file, line);
512 _NG_NODE_FORCE_WRITER(node);
513 }
514
515 static __inline void
516 _ng_node_really_die(node_p node, char *file, int line)
517 {
518 _chknode(node, file, line);
519 _NG_NODE_REALLY_DIE(node);
520 }
521
522 static __inline void
523 _ng_node_revive(node_p node, char *file, int line)
524 {
525 _chknode(node, file, line);
526 _NG_NODE_REVIVE(node);
527 }
528
529 static __inline hook_p
530 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
531 char *file, int line)
532 {
533 hook_p hook;
534 _chknode(node, file, line);
535 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
536 return (hook);
537 }
538
539 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
540 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
541 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
542 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
543 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
544 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
545 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
546 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
547 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
548 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
549 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
550 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
551 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
552 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
553 do { \
554 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
555 } while (0)
556
557 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
558
559 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
560 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
561 #define NG_NODE_ID(node) _NG_NODE_ID(node)
562 #define NG_NODE_REF(node) _NG_NODE_REF(node)
563 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
564 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
565 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
566 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
567 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
568 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
569 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
570 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
571 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
572 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
573 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
574 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
575
576 /***********************************************************************
577 ************* Node Queue and Item Structures and Methods **************
578 ***********************************************************************
579 *
580 */
581 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
582 typedef void ng_apply_t(void *context, int error);
583 struct ng_item {
584 u_long el_flags;
585 item_p el_next;
586 node_p el_dest; /* The node it will be applied against (or NULL) */
587 hook_p el_hook; /* Entering hook. Optional in Control messages */
588 union {
589 struct mbuf *da_m;
590 struct {
591 struct ng_mesg *msg_msg;
592 ng_ID_t msg_retaddr;
593 } msg;
594 struct {
595 ng_item_fn *fn_fn;
596 void *fn_arg1;
597 int fn_arg2;
598 } fn;
599 } body;
600 /*
601 * Optional callback called when item is being applied,
602 * and its context.
603 */
604 ng_apply_t *apply;
605 void *context;
606 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
607 char *lastfile;
608 int lastline;
609 TAILQ_ENTRY(ng_item) all; /* all existing items */
610 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
611 };
612
613 #define NGQF_TYPE 0x03 /* MASK of content definition */
614 #define NGQF_MESG 0x00 /* the queue element is a message */
615 #define NGQF_DATA 0x01 /* the queue element is data */
616 #define NGQF_FN 0x02 /* the queue element is a function */
617 #define NGQF_UNDEF 0x03 /* UNDEFINED */
618
619 #define NGQF_RW 0x04 /* MASK for wanted queue mode */
620 #define NGQF_READER 0x04 /* wants to be a reader */
621 #define NGQF_WRITER 0x00 /* wants to be a writer */
622
623 #define NGQF_QMODE 0x08 /* MASK for how it was queued */
624 #define NGQF_QREADER 0x08 /* was queued as a reader */
625 #define NGQF_QWRITER 0x00 /* was queued as a writer */
626
627 /*
628 * Get the mbuf (etc) out of an item.
629 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
630 * with it, (to avoid freeing the things twice).
631 * If you don't want to zero out the item then realise that the
632 * item still owns it.
633 * Retaddr is different. There are no references on that. It's just a number.
634 * The debug versions must be either all used everywhere or not at all.
635 */
636
637 #define _NGI_M(i) ((i)->body.da_m)
638 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
639 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
640 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
641 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
642 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
643 #define _NGI_NODE(i) ((i)->el_dest)
644 #define _NGI_HOOK(i) ((i)->el_hook)
645 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
646 #define _NGI_CLR_HOOK(i) do { \
647 hook_p _hook = _NGI_HOOK(i); \
648 if (_hook) { \
649 _NG_HOOK_UNREF(_hook); \
650 _NGI_HOOK(i) = NULL; \
651 } \
652 } while (0)
653 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
654 #define _NGI_CLR_NODE(i) do { \
655 node_p _node = _NGI_NODE(i); \
656 if (_node) { \
657 _NG_NODE_UNREF(_node); \
658 _NGI_NODE(i) = NULL; \
659 } \
660 } while (0)
661
662 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
663 void dumpitem(item_p item, char *file, int line);
664 static __inline void _ngi_check(item_p item, char *file, int line) ;
665 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
666 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
667 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
668 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
669 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
670 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
671 static __inline node_p _ngi_node(item_p item, char *file, int line);
672 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
673
674 static __inline void
675 _ngi_check(item_p item, char *file, int line)
676 {
677 (item)->lastline = line;
678 (item)->lastfile = file;
679 }
680
681 static __inline struct mbuf **
682 _ngi_m(item_p item, char *file, int line)
683 {
684 _ngi_check(item, file, line);
685 return (&_NGI_M(item));
686 }
687
688 static __inline struct ng_mesg **
689 _ngi_msg(item_p item, char *file, int line)
690 {
691 _ngi_check(item, file, line);
692 return (&_NGI_MSG(item));
693 }
694
695 static __inline ng_ID_t *
696 _ngi_retaddr(item_p item, char *file, int line)
697 {
698 _ngi_check(item, file, line);
699 return (&_NGI_RETADDR(item));
700 }
701
702 static __inline ng_item_fn **
703 _ngi_fn(item_p item, char *file, int line)
704 {
705 _ngi_check(item, file, line);
706 return (&_NGI_FN(item));
707 }
708
709 static __inline void **
710 _ngi_arg1(item_p item, char *file, int line)
711 {
712 _ngi_check(item, file, line);
713 return (&_NGI_ARG1(item));
714 }
715
716 static __inline int *
717 _ngi_arg2(item_p item, char *file, int line)
718 {
719 _ngi_check(item, file, line);
720 return (&_NGI_ARG2(item));
721 }
722
723 static __inline node_p
724 _ngi_node(item_p item, char *file, int line)
725 {
726 _ngi_check(item, file, line);
727 return (_NGI_NODE(item));
728 }
729
730 static __inline hook_p
731 _ngi_hook(item_p item, char *file, int line)
732 {
733 _ngi_check(item, file, line);
734 return (_NGI_HOOK(item));
735 }
736
737 #define NGI_M(i) (*_ngi_m(i, _NN_))
738 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
739 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
740 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
741 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
742 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
743 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
744 #define NGI_NODE(i) _ngi_node(i, _NN_)
745 #define NGI_SET_HOOK(i,h) \
746 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
747 #define NGI_CLR_HOOK(i) \
748 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
749 #define NGI_SET_NODE(i,n) \
750 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
751 #define NGI_CLR_NODE(i) \
752 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
753
754 #define NG_FREE_ITEM(item) \
755 do { \
756 _ngi_check(item, _NN_); \
757 ng_free_item((item)); \
758 } while (0)
759
760 #define SAVE_LINE(item) \
761 do { \
762 (item)->lastline = __LINE__; \
763 (item)->lastfile = __FILE__; \
764 } while (0)
765
766 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
767
768 #define NGI_M(i) _NGI_M(i)
769 #define NGI_MSG(i) _NGI_MSG(i)
770 #define NGI_RETADDR(i) _NGI_RETADDR(i)
771 #define NGI_FN(i) _NGI_FN(i)
772 #define NGI_ARG1(i) _NGI_ARG1(i)
773 #define NGI_ARG2(i) _NGI_ARG2(i)
774 #define NGI_NODE(i) _NGI_NODE(i)
775 #define NGI_HOOK(i) _NGI_HOOK(i)
776 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
777 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
778 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
779 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
780
781 #define NG_FREE_ITEM(item) ng_free_item((item))
782 #define SAVE_LINE(item) do {} while (0)
783
784 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
785
786 #define NGI_GET_M(i,m) \
787 do { \
788 (m) = NGI_M(i); \
789 _NGI_M(i) = NULL; \
790 } while (0)
791
792 #define NGI_GET_MSG(i,m) \
793 do { \
794 (m) = NGI_MSG(i); \
795 _NGI_MSG(i) = NULL; \
796 } while (0)
797
798 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
799 do { \
800 (n) = NGI_NODE(i); \
801 _NGI_NODE(i) = NULL; \
802 } while (0)
803
804 #define NGI_GET_HOOK(i,h) \
805 do { \
806 (h) = NGI_HOOK(i); \
807 _NGI_HOOK(i) = NULL; \
808 } while (0)
809
810 #define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE)
811 #define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER)
812
813 #define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER)
814 #define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
815
816 /**********************************************************************
817 * Data macros. Send, manipulate and free.
818 **********************************************************************/
819 /*
820 * Assuming the data is already ok, just set the new address and send
821 */
822 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \
823 do { \
824 (error) = \
825 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \
826 if (error == 0) { \
827 SAVE_LINE(item); \
828 (error) = ng_snd_item((item), (flags)); \
829 } \
830 (item) = NULL; \
831 } while (0)
832 #define NG_FWD_ITEM_HOOK(error, item, hook) \
833 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
834
835 /*
836 * Forward a data packet. Mbuf pointer is updated to new value. We
837 * presume you dealt with the old one when you update it to the new one
838 * (or it maybe the old one). We got a packet and possibly had to modify
839 * the mbuf. You should probably use NGI_GET_M() if you are going to use
840 * this too.
841 */
842 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \
843 do { \
844 NGI_M(item) = (m); \
845 (m) = NULL; \
846 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \
847 } while (0)
848 #define NG_FWD_NEW_DATA(error, item, hook, m) \
849 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
850
851 /* Send a previously unpackaged mbuf. XXX: This should be called
852 * NG_SEND_DATA in future, but this name is kept for compatibility
853 * reasons.
854 */
855 #define NG_SEND_DATA_FLAGS(error, hook, m, flags) \
856 do { \
857 item_p _item; \
858 if ((_item = ng_package_data((m), flags))) { \
859 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
860 } else { \
861 (error) = ENOMEM; \
862 } \
863 (m) = NULL; \
864 } while (0)
865
866 #define NG_SEND_DATA_ONLY(error, hook, m) \
867 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
868 /* NG_SEND_DATA() compat for meta-data times */
869 #define NG_SEND_DATA(error, hook, m, x) \
870 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
871
872 #define NG_FREE_MSG(msg) \
873 do { \
874 if ((msg)) { \
875 FREE((msg), M_NETGRAPH_MSG); \
876 (msg) = NULL; \
877 } \
878 } while (0)
879
880 #define NG_FREE_M(m) \
881 do { \
882 if ((m)) { \
883 m_freem((m)); \
884 (m) = NULL; \
885 } \
886 } while (0)
887
888 /*****************************************
889 * Message macros
890 *****************************************/
891
892 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
893 do { \
894 item_p _item; \
895 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
896 (msg) = NULL; \
897 (error) = ENOMEM; \
898 break; \
899 } \
900 if (((error) = ng_address_hook((here), (_item), \
901 (hook), (retaddr))) == 0) { \
902 SAVE_LINE(_item); \
903 (error) = ng_snd_item((_item), 0); \
904 } \
905 (msg) = NULL; \
906 } while (0)
907
908 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
909 do { \
910 item_p _item; \
911 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
912 (msg) = NULL; \
913 (error) = ENOMEM; \
914 break; \
915 } \
916 if (((error) = ng_address_path((here), (_item), \
917 (path), (retaddr))) == 0) { \
918 SAVE_LINE(_item); \
919 (error) = ng_snd_item((_item), 0); \
920 } \
921 (msg) = NULL; \
922 } while (0)
923
924 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
925 do { \
926 item_p _item; \
927 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
928 (msg) = NULL; \
929 (error) = ENOMEM; \
930 break; \
931 } \
932 if (((error) = ng_address_ID((here), (_item), \
933 (ID), (retaddr))) == 0) { \
934 SAVE_LINE(_item); \
935 (error) = ng_snd_item((_item), 0); \
936 } \
937 (msg) = NULL; \
938 } while (0)
939
940 /*
941 * Redirect the message to the next hop using the given hook.
942 * ng_retarget_msg() frees the item if there is an error
943 * and returns an error code. It returns 0 on success.
944 */
945 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
946 do { \
947 if (((error) = ng_address_hook((here), (item), \
948 (hook), (retaddr))) == 0) { \
949 SAVE_LINE(item); \
950 (error) = ng_snd_item((item), 0); \
951 } \
952 (item) = NULL; \
953 } while (0)
954
955 /*
956 * Send a queue item back to it's originator with a response message.
957 * Assume original message was removed and freed separatly.
958 */
959 #define NG_RESPOND_MSG(error, here, item, resp) \
960 do { \
961 if (resp) { \
962 ng_ID_t _dest = NGI_RETADDR(item); \
963 NGI_RETADDR(item) = 0; \
964 NGI_MSG(item) = resp; \
965 if ((ng_address_ID((here), (item), \
966 _dest, 0)) == 0) { \
967 SAVE_LINE(item); \
968 (error) = ng_snd_item((item), NG_QUEUE);\
969 } else { \
970 NG_FREE_ITEM(item); \
971 (error) = EINVAL; \
972 } \
973 } else { \
974 NG_FREE_ITEM(item); \
975 } \
976 (item) = NULL; \
977 } while (0)
978
979
980 /***********************************************************************
981 ******** Structures Definitions and Macros for defining a node *******
982 ***********************************************************************
983 *
984 * Here we define the structures needed to actually define a new node
985 * type.
986 */
987
988 /*
989 * Command list -- each node type specifies the command that it knows
990 * how to convert between ASCII and binary using an array of these.
991 * The last element in the array must be a terminator with cookie=0.
992 */
993
994 struct ng_cmdlist {
995 u_int32_t cookie; /* command typecookie */
996 int cmd; /* command number */
997 const char *name; /* command name */
998 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
999 const struct ng_parse_type *respType; /* args if NGF_RESP */
1000 };
1001
1002 /*
1003 * Structure of a node type
1004 * If data is sent to the "rcvdata()" entrypoint then the system
1005 * may decide to defer it until later by queing it with the normal netgraph
1006 * input queuing system. This is decidde by the HK_QUEUE flag being set in
1007 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1008 * ensure it is not requeued again.
1009 * Note the input queueing system is to allow modules
1010 * to 'release the stack' or to pass data across spl layers.
1011 * The data will be redelivered as soon as the NETISR code runs
1012 * which may be almost immediatly. A node may also do it's own queueing
1013 * for other reasons (e.g. device output queuing).
1014 */
1015 struct ng_type {
1016
1017 u_int32_t version; /* must equal NG_API_VERSION */
1018 const char *name; /* Unique type name */
1019 modeventhand_t mod_event; /* Module event handler (optional) */
1020 ng_constructor_t *constructor; /* Node constructor */
1021 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1022 ng_close_t *close; /* warn about forthcoming shutdown */
1023 ng_shutdown_t *shutdown; /* reset, and free resources */
1024 ng_newhook_t *newhook; /* first notification of new hook */
1025 ng_findhook_t *findhook; /* only if you have lots of hooks */
1026 ng_connect_t *connect; /* final notification of new hook */
1027 ng_rcvdata_t *rcvdata; /* data comes here */
1028 ng_disconnect_t *disconnect; /* notify on disconnect */
1029
1030 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1031
1032 /* R/W data private to the base netgraph code DON'T TOUCH! */
1033 LIST_ENTRY(ng_type) types; /* linked list of all types */
1034 int refs; /* number of instances */
1035 };
1036
1037 /*
1038 * Use the NETGRAPH_INIT() macro to link a node type into the
1039 * netgraph system. This works for types compiled into the kernel
1040 * as well as KLD modules. The first argument should be the type
1041 * name (eg, echo) and the second a pointer to the type struct.
1042 *
1043 * If a different link time is desired, e.g., a device driver that
1044 * needs to install its netgraph type before probing, use the
1045 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably
1046 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
1047 */
1048
1049 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1050 static moduledata_t ng_##typename##_mod = { \
1051 "ng_" #typename, \
1052 ng_mod_event, \
1053 (typestructp) \
1054 }; \
1055 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1056 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1057 NG_ABI_VERSION, \
1058 NG_ABI_VERSION)
1059
1060 #define NETGRAPH_INIT(tn, tp) \
1061 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1062
1063 /* Special malloc() type for netgraph structs and ctrl messages */
1064 /* Only these two types should be visible to nodes */
1065 MALLOC_DECLARE(M_NETGRAPH);
1066 MALLOC_DECLARE(M_NETGRAPH_MSG);
1067
1068 /* declare the base of the netgraph sysclt hierarchy */
1069 /* but only if this file cares about sysctls */
1070 #ifdef SYSCTL_DECL
1071 SYSCTL_DECL(_net_graph);
1072 #endif
1073
1074 /*
1075 * Methods that the nodes can use.
1076 * Many of these methods should usually NOT be used directly but via
1077 * Macros above.
1078 */
1079 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1080 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1081 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1082 int ng_bypass(hook_p hook1, hook_p hook2);
1083 hook_p ng_findhook(node_p node, const char *name);
1084 struct ng_type *ng_findtype(const char *type);
1085 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1086 int ng_name_node(node_p node, const char *name);
1087 int ng_newtype(struct ng_type *tp);
1088 ng_ID_t ng_node2ID(node_p node);
1089 item_p ng_package_data(struct mbuf *m, int flags);
1090 item_p ng_package_msg(struct ng_mesg *msg, int flags);
1091 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1092 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1093 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1094 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1095 int ng_rmtype(struct ng_type *tp);
1096 int ng_snd_item(item_p item, int queue);
1097 int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn,
1098 void *arg1, int arg2, int flags);
1099 #define ng_send_fn(node, hook, fn, arg1, arg2) \
1100 ng_send_fn1(node, hook, fn, arg1, arg2, NG_NOFLAGS)
1101 int ng_uncallout(struct callout *c, node_p node);
1102 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1103 ng_item_fn *fn, void * arg1, int arg2);
1104 #define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE)
1105
1106 /* Flags for netgraph functions. */
1107 #define NG_NOFLAGS 0x00000000 /* no special options */
1108 #define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */
1109 #define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */
1110 #define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */
1111
1112 /*
1113 * prototypes the user should DEFINITELY not use directly
1114 */
1115 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1116 int ng_mod_event(module_t mod, int what, void *arg);
1117
1118 /*
1119 * Tag definitions and constants
1120 */
1121
1122 #define NG_TAG_PRIO 1
1123
1124 struct ng_tag_prio {
1125 struct m_tag tag;
1126 char priority;
1127 char discardability;
1128 };
1129
1130 #define NG_PRIO_CUTOFF 32
1131 #define NG_PRIO_LINKSTATE 64
1132
1133 /* Macros and declarations to keep compatibility with metadata, which
1134 * is obsoleted now. To be deleted.
1135 */
1136 typedef void *meta_p;
1137 #define _NGI_META(i) NULL
1138 #define NGI_META(i) NULL
1139 #define NG_FREE_META(meta)
1140 #define NGI_GET_META(i,m)
1141 #define ng_copy_meta(meta) NULL
1142
1143 #endif /* _NETGRAPH_NETGRAPH_H_ */
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