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/9.0/sys/netgraph/netgraph.h 223768 2011-07-04 20:50:09Z 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 #include <sys/refcount.h>
57
58 #ifdef HAVE_KERNEL_OPTION_HEADERS
59 #include "opt_netgraph.h"
60 #endif
61
62 /* debugging options */
63 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */
64
65 /*
66 * This defines the in-kernel binary interface version.
67 * It is possible to change this but leave the external message
68 * API the same. Each type also has it's own cookies for versioning as well.
69 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
70 * modules.
71 */
72 #define _NG_ABI_VERSION 12
73 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
74 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000)
75 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
76 #define NG_ABI_VERSION _NG_ABI_VERSION
77 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
78
79
80 /*
81 * Forward references for the basic structures so we can
82 * define the typedefs and use them in the structures themselves.
83 */
84 struct ng_hook ;
85 struct ng_node ;
86 struct ng_item ;
87 typedef struct ng_item *item_p;
88 typedef struct ng_node *node_p;
89 typedef struct ng_hook *hook_p;
90
91 /* node method definitions */
92 typedef int ng_constructor_t(node_p node);
93 typedef int ng_close_t(node_p node);
94 typedef int ng_shutdown_t(node_p node);
95 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
96 typedef hook_p ng_findhook_t(node_p node, const char *name);
97 typedef int ng_connect_t(hook_p hook);
98 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
99 typedef int ng_rcvdata_t(hook_p hook, item_p item);
100 typedef int ng_disconnect_t(hook_p hook);
101 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item);
102
103 /***********************************************************************
104 ***************** Hook Structure and Methods **************************
105 ***********************************************************************
106 *
107 * Structure of a hook
108 */
109 struct ng_hook {
110 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */
111 void *hk_private; /* node dependant ID for this hook */
112 int hk_flags; /* info about this hook/link */
113 int hk_type; /* tbd: hook data link type */
114 struct ng_hook *hk_peer; /* the other end of this link */
115 struct ng_node *hk_node; /* The node this hook is attached to */
116 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
117 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
118 ng_rcvdata_t *hk_rcvdata; /* data comes here */
119 int hk_refs; /* dont actually free this till 0 */
120 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
121 #define HK_MAGIC 0x78573011
122 int hk_magic;
123 char *lastfile;
124 int lastline;
125 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
126 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
127 };
128 /* Flags for a hook */
129 #define HK_INVALID 0x0001 /* don't trust it! */
130 #define HK_QUEUE 0x0002 /* queue for later delivery */
131 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
132 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
133 #define HK_HI_STACK 0x0010 /* Hook has hi stack usage */
134 #define HK_TO_INBOUND 0x0020 /* Hook on ntw. stack inbound path. */
135
136 /*
137 * Public Methods for hook
138 * If you can't do it with these you probably shouldn;t be doing it.
139 */
140 void ng_unref_hook(hook_p hook); /* don't move this */
141 #define _NG_HOOK_REF(hook) refcount_acquire(&(hook)->hk_refs)
142 #define _NG_HOOK_NAME(hook) ((hook)->hk_name)
143 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
144 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
145 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
146 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
147 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
148 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
149 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
150 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
151 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
152 #define _NG_HOOK_FORCE_WRITER(hook) \
153 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
154 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
155 #define _NG_HOOK_SET_TO_INBOUND(hook) \
156 do { hook->hk_flags |= HK_TO_INBOUND; } while (0)
157 #define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0)
158
159 /* Some shortcuts */
160 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
161 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
162 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
163
164 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
165 #define _NN_ __FILE__,__LINE__
166 void dumphook (hook_p hook, char *file, int line);
167 static __inline void _chkhook(hook_p hook, char *file, int line);
168 static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
169 static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
170 static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
171 static __inline void _ng_hook_set_private(hook_p hook,
172 void * val, char * file, int line);
173 static __inline void _ng_hook_set_rcvmsg(hook_p hook,
174 ng_rcvmsg_t *val, char * file, int line);
175 static __inline void _ng_hook_set_rcvdata(hook_p hook,
176 ng_rcvdata_t *val, char * file, int line);
177 static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
178 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
179 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
180 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
181 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
182 static __inline void _ng_hook_force_writer(hook_p hook, char * file,
183 int line);
184 static __inline void _ng_hook_force_queue(hook_p hook, char * file,
185 int line);
186 static __inline void _ng_hook_set_to_inbound(hook_p hook, char * file,
187 int line);
188
189 static __inline void
190 _chkhook(hook_p hook, char *file, int line)
191 {
192 if (hook->hk_magic != HK_MAGIC) {
193 printf("Accessing freed hook ");
194 dumphook(hook, file, line);
195 }
196 hook->lastline = line;
197 hook->lastfile = file;
198 }
199
200 static __inline void
201 _ng_hook_ref(hook_p hook, char * file, int line)
202 {
203 _chkhook(hook, file, line);
204 _NG_HOOK_REF(hook);
205 }
206
207 static __inline char *
208 _ng_hook_name(hook_p hook, char * file, int line)
209 {
210 _chkhook(hook, file, line);
211 return (_NG_HOOK_NAME(hook));
212 }
213
214 static __inline void
215 _ng_hook_unref(hook_p hook, char * file, int line)
216 {
217 _chkhook(hook, file, line);
218 _NG_HOOK_UNREF(hook);
219 }
220
221 static __inline void
222 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
223 {
224 _chkhook(hook, file, line);
225 _NG_HOOK_SET_PRIVATE(hook, val);
226 }
227
228 static __inline void
229 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
230 {
231 _chkhook(hook, file, line);
232 _NG_HOOK_SET_RCVMSG(hook, val);
233 }
234
235 static __inline void
236 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
237 {
238 _chkhook(hook, file, line);
239 _NG_HOOK_SET_RCVDATA(hook, val);
240 }
241
242 static __inline void *
243 _ng_hook_private(hook_p hook, char * file, int line)
244 {
245 _chkhook(hook, file, line);
246 return (_NG_HOOK_PRIVATE(hook));
247 }
248
249 static __inline int
250 _ng_hook_not_valid(hook_p hook, char * file, int line)
251 {
252 _chkhook(hook, file, line);
253 return (_NG_HOOK_NOT_VALID(hook));
254 }
255
256 static __inline int
257 _ng_hook_is_valid(hook_p hook, char * file, int line)
258 {
259 _chkhook(hook, file, line);
260 return (_NG_HOOK_IS_VALID(hook));
261 }
262
263 static __inline node_p
264 _ng_hook_node(hook_p hook, char * file, int line)
265 {
266 _chkhook(hook, file, line);
267 return (_NG_HOOK_NODE(hook));
268 }
269
270 static __inline hook_p
271 _ng_hook_peer(hook_p hook, char * file, int line)
272 {
273 _chkhook(hook, file, line);
274 return (_NG_HOOK_PEER(hook));
275 }
276
277 static __inline void
278 _ng_hook_force_writer(hook_p hook, char * file, int line)
279 {
280 _chkhook(hook, file, line);
281 _NG_HOOK_FORCE_WRITER(hook);
282 }
283
284 static __inline void
285 _ng_hook_force_queue(hook_p hook, char * file, int line)
286 {
287 _chkhook(hook, file, line);
288 _NG_HOOK_FORCE_QUEUE(hook);
289 }
290
291 static __inline void
292 _ng_hook_set_to_inbound(hook_p hook, char * file, int line)
293 {
294 _chkhook(hook, file, line);
295 _NG_HOOK_SET_TO_INBOUND(hook);
296 }
297
298 static __inline void
299 _ng_hook_hi_stack(hook_p hook, char * file, int line)
300 {
301 _chkhook(hook, file, line);
302 _NG_HOOK_HI_STACK(hook);
303 }
304
305
306 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
307 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
308 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
309 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
310 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
311 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
312 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
313 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
314 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
315 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
316 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
317 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
318 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
319 #define NG_HOOK_SET_TO_INBOUND(hook) _ng_hook_set_to_inbound(hook, _NN_)
320 #define NG_HOOK_HI_STACK(hook) _ng_hook_hi_stack(hook, _NN_)
321
322 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
323
324 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
325 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
326 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
327 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
328 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
329 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
330 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
331 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
332 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
333 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
334 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
335 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
336 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
337 #define NG_HOOK_SET_TO_INBOUND(hook) _NG_HOOK_SET_TO_INBOUND(hook)
338 #define NG_HOOK_HI_STACK(hook) _NG_HOOK_HI_STACK(hook)
339
340 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
341
342 /***********************************************************************
343 ***************** Node Structure and Methods **************************
344 ***********************************************************************
345 * Structure of a node
346 * including the eembedded queue structure.
347 *
348 * The structure for queueing Netgraph request items
349 * embedded in the node structure
350 */
351 struct ng_queue {
352 u_int q_flags; /* Current r/w/q lock flags */
353 u_int q_flags2; /* Other queue flags */
354 struct mtx q_mtx;
355 STAILQ_ENTRY(ng_node) q_work; /* nodes with work to do */
356 STAILQ_HEAD(, ng_item) queue; /* actually items queue */
357 };
358
359 struct ng_node {
360 char nd_name[NG_NODESIZ]; /* optional globally unique name */
361 struct ng_type *nd_type; /* the installed 'type' */
362 int nd_flags; /* see below for bit definitions */
363 int nd_numhooks; /* number of hooks */
364 void *nd_private; /* node type dependant node ID */
365 ng_ID_t nd_ID; /* Unique per node */
366 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
367 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */
368 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
369 struct ng_queue nd_input_queue; /* input queue for locking */
370 int nd_refs; /* # of references to this node */
371 struct vnet *nd_vnet; /* network stack instance */
372 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
373 #define ND_MAGIC 0x59264837
374 int nd_magic;
375 char *lastfile;
376 int lastline;
377 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
378 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
379 };
380
381 /* Flags for a node */
382 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */
383 #define NG_INVALID NGF_INVALID /* compat for old code */
384 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */
385 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
386 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */
387 #define NG_CLOSING NGF_CLOSING /* compat for old code */
388 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */
389 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */
390 #define NGF_HI_STACK 0x00000020 /* node has hi stack usage */
391 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
392 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
393 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
394 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
395
396 /*
397 * Public methods for nodes.
398 * If you can't do it with these you probably shouldn't be doing it.
399 */
400 void ng_unref_node(node_p node); /* don't move this */
401 #define _NG_NODE_NAME(node) ((node)->nd_name + 0)
402 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
403 #define _NG_NODE_ID(node) ((node)->nd_ID + 0)
404 #define _NG_NODE_REF(node) refcount_acquire(&(node)->nd_refs)
405 #define _NG_NODE_UNREF(node) ng_unref_node(node)
406 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
407 #define _NG_NODE_PRIVATE(node) ((node)->nd_private)
408 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
409 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID)
410 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
411 #define _NG_NODE_FORCE_WRITER(node) \
412 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
413 #define _NG_NODE_HI_STACK(node) \
414 do{ node->nd_flags |= NGF_HI_STACK; }while (0)
415 #define _NG_NODE_REALLY_DIE(node) \
416 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
417 #define _NG_NODE_REVIVE(node) \
418 do { node->nd_flags &= ~NGF_INVALID; } while (0)
419 /*
420 * The hook iterator.
421 * This macro will call a function of type ng_fn_eachhook for each
422 * hook attached to the node. If the function returns 0, then the
423 * iterator will stop and return a pointer to the hook that returned 0.
424 */
425 typedef int ng_fn_eachhook(hook_p hook, void* arg);
426 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
427 do { \
428 hook_p _hook; \
429 (rethook) = NULL; \
430 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
431 if ((fn)(_hook, arg) == 0) { \
432 (rethook) = _hook; \
433 break; \
434 } \
435 } \
436 } while (0)
437
438 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
439 void dumpnode(node_p node, char *file, int line);
440 static __inline void _chknode(node_p node, char *file, int line);
441 static __inline char * _ng_node_name(node_p node, char *file, int line);
442 static __inline int _ng_node_has_name(node_p node, char *file, int line);
443 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
444 static __inline void _ng_node_ref(node_p node, char *file, int line);
445 static __inline void _ng_node_unref(node_p node, char *file, int line);
446 static __inline void _ng_node_set_private(node_p node, void * val,
447 char *file, int line);
448 static __inline void * _ng_node_private(node_p node, char *file, int line);
449 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
450 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
451 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
452 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
453 static __inline hook_p _ng_node_foreach_hook(node_p node,
454 ng_fn_eachhook *fn, void *arg, char *file, int line);
455 static __inline void _ng_node_revive(node_p node, char *file, int line);
456
457 static __inline void
458 _chknode(node_p node, char *file, int line)
459 {
460 if (node->nd_magic != ND_MAGIC) {
461 printf("Accessing freed node ");
462 dumpnode(node, file, line);
463 }
464 node->lastline = line;
465 node->lastfile = file;
466 }
467
468 static __inline char *
469 _ng_node_name(node_p node, char *file, int line)
470 {
471 _chknode(node, file, line);
472 return(_NG_NODE_NAME(node));
473 }
474
475 static __inline int
476 _ng_node_has_name(node_p node, char *file, int line)
477 {
478 _chknode(node, file, line);
479 return(_NG_NODE_HAS_NAME(node));
480 }
481
482 static __inline ng_ID_t
483 _ng_node_id(node_p node, char *file, int line)
484 {
485 _chknode(node, file, line);
486 return(_NG_NODE_ID(node));
487 }
488
489 static __inline void
490 _ng_node_ref(node_p node, char *file, int line)
491 {
492 _chknode(node, file, line);
493 _NG_NODE_REF(node);
494 }
495
496 static __inline void
497 _ng_node_unref(node_p node, char *file, int line)
498 {
499 _chknode(node, file, line);
500 _NG_NODE_UNREF(node);
501 }
502
503 static __inline void
504 _ng_node_set_private(node_p node, void * val, char *file, int line)
505 {
506 _chknode(node, file, line);
507 _NG_NODE_SET_PRIVATE(node, val);
508 }
509
510 static __inline void *
511 _ng_node_private(node_p node, char *file, int line)
512 {
513 _chknode(node, file, line);
514 return (_NG_NODE_PRIVATE(node));
515 }
516
517 static __inline int
518 _ng_node_is_valid(node_p node, char *file, int line)
519 {
520 _chknode(node, file, line);
521 return(_NG_NODE_IS_VALID(node));
522 }
523
524 static __inline int
525 _ng_node_not_valid(node_p node, char *file, int line)
526 {
527 _chknode(node, file, line);
528 return(_NG_NODE_NOT_VALID(node));
529 }
530
531 static __inline int
532 _ng_node_numhooks(node_p node, char *file, int line)
533 {
534 _chknode(node, file, line);
535 return(_NG_NODE_NUMHOOKS(node));
536 }
537
538 static __inline void
539 _ng_node_force_writer(node_p node, char *file, int line)
540 {
541 _chknode(node, file, line);
542 _NG_NODE_FORCE_WRITER(node);
543 }
544
545 static __inline void
546 _ng_node_hi_stack(node_p node, char *file, int line)
547 {
548 _chknode(node, file, line);
549 _NG_NODE_HI_STACK(node);
550 }
551
552 static __inline void
553 _ng_node_really_die(node_p node, char *file, int line)
554 {
555 _chknode(node, file, line);
556 _NG_NODE_REALLY_DIE(node);
557 }
558
559 static __inline void
560 _ng_node_revive(node_p node, char *file, int line)
561 {
562 _chknode(node, file, line);
563 _NG_NODE_REVIVE(node);
564 }
565
566 static __inline hook_p
567 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
568 char *file, int line)
569 {
570 hook_p hook;
571 _chknode(node, file, line);
572 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
573 return (hook);
574 }
575
576 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
577 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
578 #define NG_NODE_ID(node) _ng_node_id(node, _NN_)
579 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
580 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
581 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
582 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
583 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
584 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
585 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
586 #define NG_NODE_HI_STACK(node) _ng_node_hi_stack(node, _NN_)
587 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
588 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
589 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
590 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
591 do { \
592 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
593 } while (0)
594
595 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
596
597 #define NG_NODE_NAME(node) _NG_NODE_NAME(node)
598 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
599 #define NG_NODE_ID(node) _NG_NODE_ID(node)
600 #define NG_NODE_REF(node) _NG_NODE_REF(node)
601 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
602 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
603 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
604 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
605 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
606 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
607 #define NG_NODE_HI_STACK(node) _NG_NODE_HI_STACK(node)
608 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
609 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
610 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
611 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \
612 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
613 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
614
615 /***********************************************************************
616 ************* Node Queue and Item Structures and Methods **************
617 ***********************************************************************
618 *
619 */
620 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
621 typedef int ng_item_fn2(node_p node, struct ng_item *item, hook_p hook);
622 typedef void ng_apply_t(void *context, int error);
623 struct ng_apply_info {
624 ng_apply_t *apply;
625 void *context;
626 int refs;
627 int error;
628 };
629 struct ng_item {
630 u_long el_flags;
631 STAILQ_ENTRY(ng_item) el_next;
632 node_p el_dest; /* The node it will be applied against (or NULL) */
633 hook_p el_hook; /* Entering hook. Optional in Control messages */
634 union {
635 struct mbuf *da_m;
636 struct {
637 struct ng_mesg *msg_msg;
638 ng_ID_t msg_retaddr;
639 } msg;
640 struct {
641 union {
642 ng_item_fn *fn_fn;
643 ng_item_fn2 *fn_fn2;
644 } fn_fn;
645 void *fn_arg1;
646 int fn_arg2;
647 } fn;
648 } body;
649 /*
650 * Optional callback called when item is being applied,
651 * and its context.
652 */
653 struct ng_apply_info *apply;
654 u_int depth;
655 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
656 char *lastfile;
657 int lastline;
658 TAILQ_ENTRY(ng_item) all; /* all existing items */
659 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
660 };
661
662 #define NGQF_TYPE 0x03 /* MASK of content definition */
663 #define NGQF_MESG 0x00 /* the queue element is a message */
664 #define NGQF_DATA 0x01 /* the queue element is data */
665 #define NGQF_FN 0x02 /* the queue element is a function */
666 #define NGQF_FN2 0x03 /* the queue element is a new function */
667
668 #define NGQF_RW 0x04 /* MASK for wanted queue mode */
669 #define NGQF_READER 0x04 /* wants to be a reader */
670 #define NGQF_WRITER 0x00 /* wants to be a writer */
671
672 #define NGQF_QMODE 0x08 /* MASK for how it was queued */
673 #define NGQF_QREADER 0x08 /* was queued as a reader */
674 #define NGQF_QWRITER 0x00 /* was queued as a writer */
675
676 /*
677 * Get the mbuf (etc) out of an item.
678 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
679 * with it, (to avoid freeing the things twice).
680 * If you don't want to zero out the item then realise that the
681 * item still owns it.
682 * Retaddr is different. There are no references on that. It's just a number.
683 * The debug versions must be either all used everywhere or not at all.
684 */
685
686 #define _NGI_M(i) ((i)->body.da_m)
687 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
688 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
689 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn)
690 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2)
691 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
692 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
693 #define _NGI_NODE(i) ((i)->el_dest)
694 #define _NGI_HOOK(i) ((i)->el_hook)
695 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
696 #define _NGI_CLR_HOOK(i) do { \
697 hook_p _hook = _NGI_HOOK(i); \
698 if (_hook) { \
699 _NG_HOOK_UNREF(_hook); \
700 _NGI_HOOK(i) = NULL; \
701 } \
702 } while (0)
703 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
704 #define _NGI_CLR_NODE(i) do { \
705 node_p _node = _NGI_NODE(i); \
706 if (_node) { \
707 _NG_NODE_UNREF(_node); \
708 _NGI_NODE(i) = NULL; \
709 } \
710 } while (0)
711
712 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
713 void dumpitem(item_p item, char *file, int line);
714 static __inline void _ngi_check(item_p item, char *file, int line) ;
715 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
716 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
717 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
718 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
719 static __inline ng_item_fn2 ** _ngi_fn2(item_p item, char *file, int line) ;
720 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
721 static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
722 static __inline node_p _ngi_node(item_p item, char *file, int line);
723 static __inline hook_p _ngi_hook(item_p item, char *file, int line);
724
725 static __inline void
726 _ngi_check(item_p item, char *file, int line)
727 {
728 (item)->lastline = line;
729 (item)->lastfile = file;
730 }
731
732 static __inline struct mbuf **
733 _ngi_m(item_p item, char *file, int line)
734 {
735 _ngi_check(item, file, line);
736 return (&_NGI_M(item));
737 }
738
739 static __inline struct ng_mesg **
740 _ngi_msg(item_p item, char *file, int line)
741 {
742 _ngi_check(item, file, line);
743 return (&_NGI_MSG(item));
744 }
745
746 static __inline ng_ID_t *
747 _ngi_retaddr(item_p item, char *file, int line)
748 {
749 _ngi_check(item, file, line);
750 return (&_NGI_RETADDR(item));
751 }
752
753 static __inline ng_item_fn **
754 _ngi_fn(item_p item, char *file, int line)
755 {
756 _ngi_check(item, file, line);
757 return (&_NGI_FN(item));
758 }
759
760 static __inline ng_item_fn2 **
761 _ngi_fn2(item_p item, char *file, int line)
762 {
763 _ngi_check(item, file, line);
764 return (&_NGI_FN2(item));
765 }
766
767 static __inline void **
768 _ngi_arg1(item_p item, char *file, int line)
769 {
770 _ngi_check(item, file, line);
771 return (&_NGI_ARG1(item));
772 }
773
774 static __inline int *
775 _ngi_arg2(item_p item, char *file, int line)
776 {
777 _ngi_check(item, file, line);
778 return (&_NGI_ARG2(item));
779 }
780
781 static __inline node_p
782 _ngi_node(item_p item, char *file, int line)
783 {
784 _ngi_check(item, file, line);
785 return (_NGI_NODE(item));
786 }
787
788 static __inline hook_p
789 _ngi_hook(item_p item, char *file, int line)
790 {
791 _ngi_check(item, file, line);
792 return (_NGI_HOOK(item));
793 }
794
795 #define NGI_M(i) (*_ngi_m(i, _NN_))
796 #define NGI_MSG(i) (*_ngi_msg(i, _NN_))
797 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
798 #define NGI_FN(i) (*_ngi_fn(i, _NN_))
799 #define NGI_FN2(i) (*_ngi_fn2(i, _NN_))
800 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
801 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
802 #define NGI_HOOK(i) _ngi_hook(i, _NN_)
803 #define NGI_NODE(i) _ngi_node(i, _NN_)
804 #define NGI_SET_HOOK(i,h) \
805 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
806 #define NGI_CLR_HOOK(i) \
807 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
808 #define NGI_SET_NODE(i,n) \
809 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
810 #define NGI_CLR_NODE(i) \
811 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
812
813 #define NG_FREE_ITEM(item) \
814 do { \
815 _ngi_check(item, _NN_); \
816 ng_free_item((item)); \
817 } while (0)
818
819 #define SAVE_LINE(item) \
820 do { \
821 (item)->lastline = __LINE__; \
822 (item)->lastfile = __FILE__; \
823 } while (0)
824
825 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
826
827 #define NGI_M(i) _NGI_M(i)
828 #define NGI_MSG(i) _NGI_MSG(i)
829 #define NGI_RETADDR(i) _NGI_RETADDR(i)
830 #define NGI_FN(i) _NGI_FN(i)
831 #define NGI_FN2(i) _NGI_FN2(i)
832 #define NGI_ARG1(i) _NGI_ARG1(i)
833 #define NGI_ARG2(i) _NGI_ARG2(i)
834 #define NGI_NODE(i) _NGI_NODE(i)
835 #define NGI_HOOK(i) _NGI_HOOK(i)
836 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
837 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
838 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
839 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
840
841 #define NG_FREE_ITEM(item) ng_free_item((item))
842 #define SAVE_LINE(item) do {} while (0)
843
844 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
845
846 #define NGI_GET_M(i,m) \
847 do { \
848 (m) = NGI_M(i); \
849 _NGI_M(i) = NULL; \
850 } while (0)
851
852 #define NGI_GET_MSG(i,m) \
853 do { \
854 (m) = NGI_MSG(i); \
855 _NGI_MSG(i) = NULL; \
856 } while (0)
857
858 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
859 do { \
860 (n) = NGI_NODE(i); \
861 _NGI_NODE(i) = NULL; \
862 } while (0)
863
864 #define NGI_GET_HOOK(i,h) \
865 do { \
866 (h) = NGI_HOOK(i); \
867 _NGI_HOOK(i) = NULL; \
868 } while (0)
869
870 #define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE)
871 #define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER)
872
873 #define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER)
874 #define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
875
876 /**********************************************************************
877 * Data macros. Send, manipulate and free.
878 **********************************************************************/
879 /*
880 * Assuming the data is already ok, just set the new address and send
881 */
882 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \
883 do { \
884 (error) = \
885 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \
886 if (error == 0) { \
887 SAVE_LINE(item); \
888 (error) = ng_snd_item((item), (flags)); \
889 } \
890 (item) = NULL; \
891 } while (0)
892 #define NG_FWD_ITEM_HOOK(error, item, hook) \
893 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
894
895 /*
896 * Forward a data packet. Mbuf pointer is updated to new value. We
897 * presume you dealt with the old one when you update it to the new one
898 * (or it maybe the old one). We got a packet and possibly had to modify
899 * the mbuf. You should probably use NGI_GET_M() if you are going to use
900 * this too.
901 */
902 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \
903 do { \
904 NGI_M(item) = (m); \
905 (m) = NULL; \
906 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \
907 } while (0)
908 #define NG_FWD_NEW_DATA(error, item, hook, m) \
909 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
910
911 /* Send a previously unpackaged mbuf. XXX: This should be called
912 * NG_SEND_DATA in future, but this name is kept for compatibility
913 * reasons.
914 */
915 #define NG_SEND_DATA_FLAGS(error, hook, m, flags) \
916 do { \
917 item_p _item; \
918 if ((_item = ng_package_data((m), flags))) { \
919 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
920 } else { \
921 (error) = ENOMEM; \
922 } \
923 (m) = NULL; \
924 } while (0)
925
926 #define NG_SEND_DATA_ONLY(error, hook, m) \
927 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
928 /* NG_SEND_DATA() compat for meta-data times */
929 #define NG_SEND_DATA(error, hook, m, x) \
930 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
931
932 #define NG_FREE_MSG(msg) \
933 do { \
934 if ((msg)) { \
935 free((msg), M_NETGRAPH_MSG); \
936 (msg) = NULL; \
937 } \
938 } while (0)
939
940 #define NG_FREE_M(m) \
941 do { \
942 if ((m)) { \
943 m_freem((m)); \
944 (m) = NULL; \
945 } \
946 } while (0)
947
948 /*****************************************
949 * Message macros
950 *****************************************/
951
952 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
953 do { \
954 item_p _item; \
955 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
956 (msg) = NULL; \
957 (error) = ENOMEM; \
958 break; \
959 } \
960 if (((error) = ng_address_hook((here), (_item), \
961 (hook), (retaddr))) == 0) { \
962 SAVE_LINE(_item); \
963 (error) = ng_snd_item((_item), 0); \
964 } \
965 (msg) = NULL; \
966 } while (0)
967
968 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
969 do { \
970 item_p _item; \
971 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
972 (msg) = NULL; \
973 (error) = ENOMEM; \
974 break; \
975 } \
976 if (((error) = ng_address_path((here), (_item), \
977 (path), (retaddr))) == 0) { \
978 SAVE_LINE(_item); \
979 (error) = ng_snd_item((_item), 0); \
980 } \
981 (msg) = NULL; \
982 } while (0)
983
984 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
985 do { \
986 item_p _item; \
987 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
988 (msg) = NULL; \
989 (error) = ENOMEM; \
990 break; \
991 } \
992 if (((error) = ng_address_ID((here), (_item), \
993 (ID), (retaddr))) == 0) { \
994 SAVE_LINE(_item); \
995 (error) = ng_snd_item((_item), 0); \
996 } \
997 (msg) = NULL; \
998 } while (0)
999
1000 /*
1001 * Redirect the message to the next hop using the given hook.
1002 * ng_retarget_msg() frees the item if there is an error
1003 * and returns an error code. It returns 0 on success.
1004 */
1005 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
1006 do { \
1007 if (((error) = ng_address_hook((here), (item), \
1008 (hook), (retaddr))) == 0) { \
1009 SAVE_LINE(item); \
1010 (error) = ng_snd_item((item), 0); \
1011 } \
1012 (item) = NULL; \
1013 } while (0)
1014
1015 /*
1016 * Send a queue item back to it's originator with a response message.
1017 * Assume original message was removed and freed separatly.
1018 */
1019 #define NG_RESPOND_MSG(error, here, item, resp) \
1020 do { \
1021 if (resp) { \
1022 ng_ID_t _dest = NGI_RETADDR(item); \
1023 NGI_RETADDR(item) = 0; \
1024 NGI_MSG(item) = resp; \
1025 if ((error = ng_address_ID((here), (item), \
1026 _dest, 0)) == 0) { \
1027 SAVE_LINE(item); \
1028 (error) = ng_snd_item((item), NG_QUEUE);\
1029 } \
1030 } else \
1031 NG_FREE_ITEM(item); \
1032 (item) = NULL; \
1033 } while (0)
1034
1035
1036 /***********************************************************************
1037 ******** Structures Definitions and Macros for defining a node *******
1038 ***********************************************************************
1039 *
1040 * Here we define the structures needed to actually define a new node
1041 * type.
1042 */
1043
1044 /*
1045 * Command list -- each node type specifies the command that it knows
1046 * how to convert between ASCII and binary using an array of these.
1047 * The last element in the array must be a terminator with cookie=0.
1048 */
1049
1050 struct ng_cmdlist {
1051 u_int32_t cookie; /* command typecookie */
1052 int cmd; /* command number */
1053 const char *name; /* command name */
1054 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
1055 const struct ng_parse_type *respType; /* args if NGF_RESP */
1056 };
1057
1058 /*
1059 * Structure of a node type
1060 * If data is sent to the "rcvdata()" entrypoint then the system
1061 * may decide to defer it until later by queing it with the normal netgraph
1062 * input queuing system. This is decidde by the HK_QUEUE flag being set in
1063 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1064 * ensure it is not requeued again.
1065 * Note the input queueing system is to allow modules
1066 * to 'release the stack' or to pass data across spl layers.
1067 * The data will be redelivered as soon as the NETISR code runs
1068 * which may be almost immediatly. A node may also do it's own queueing
1069 * for other reasons (e.g. device output queuing).
1070 */
1071 struct ng_type {
1072
1073 u_int32_t version; /* must equal NG_API_VERSION */
1074 const char *name; /* Unique type name */
1075 modeventhand_t mod_event; /* Module event handler (optional) */
1076 ng_constructor_t *constructor; /* Node constructor */
1077 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1078 ng_close_t *close; /* warn about forthcoming shutdown */
1079 ng_shutdown_t *shutdown; /* reset, and free resources */
1080 ng_newhook_t *newhook; /* first notification of new hook */
1081 ng_findhook_t *findhook; /* only if you have lots of hooks */
1082 ng_connect_t *connect; /* final notification of new hook */
1083 ng_rcvdata_t *rcvdata; /* data comes here */
1084 ng_disconnect_t *disconnect; /* notify on disconnect */
1085
1086 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1087
1088 /* R/W data private to the base netgraph code DON'T TOUCH! */
1089 LIST_ENTRY(ng_type) types; /* linked list of all types */
1090 int refs; /* number of instances */
1091 };
1092
1093 /*
1094 * Use the NETGRAPH_INIT() macro to link a node type into the
1095 * netgraph system. This works for types compiled into the kernel
1096 * as well as KLD modules. The first argument should be the type
1097 * name (eg, echo) and the second a pointer to the type struct.
1098 *
1099 * If a different link time is desired, e.g., a device driver that
1100 * needs to install its netgraph type before probing, use the
1101 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably
1102 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
1103 */
1104
1105 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1106 static moduledata_t ng_##typename##_mod = { \
1107 "ng_" #typename, \
1108 ng_mod_event, \
1109 (typestructp) \
1110 }; \
1111 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1112 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1113 NG_ABI_VERSION, \
1114 NG_ABI_VERSION)
1115
1116 #define NETGRAPH_INIT(tn, tp) \
1117 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_MIDDLE)
1118
1119 /* Special malloc() type for netgraph structs and ctrl messages */
1120 /* Only these two types should be visible to nodes */
1121 MALLOC_DECLARE(M_NETGRAPH);
1122 MALLOC_DECLARE(M_NETGRAPH_MSG);
1123
1124 /* declare the base of the netgraph sysclt hierarchy */
1125 /* but only if this file cares about sysctls */
1126 #ifdef SYSCTL_DECL
1127 SYSCTL_DECL(_net_graph);
1128 #endif
1129
1130 /*
1131 * Methods that the nodes can use.
1132 * Many of these methods should usually NOT be used directly but via
1133 * Macros above.
1134 */
1135 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1136 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1137 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1138 int ng_bypass(hook_p hook1, hook_p hook2);
1139 hook_p ng_findhook(node_p node, const char *name);
1140 struct ng_type *ng_findtype(const char *type);
1141 int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1142 int ng_name_node(node_p node, const char *name);
1143 node_p ng_name2noderef(node_p node, const char *name);
1144 int ng_newtype(struct ng_type *tp);
1145 ng_ID_t ng_node2ID(node_p node);
1146 item_p ng_package_data(struct mbuf *m, int flags);
1147 item_p ng_package_msg(struct ng_mesg *msg, int flags);
1148 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1149 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1150 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1151 int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1152 int ng_rmtype(struct ng_type *tp);
1153 int ng_snd_item(item_p item, int queue);
1154 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1155 int arg2);
1156 int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1157 int arg2, int flags);
1158 int ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn,
1159 void *arg1, int arg2, int flags);
1160 int ng_uncallout(struct callout *c, node_p node);
1161 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1162 ng_item_fn *fn, void * arg1, int arg2);
1163 #define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE)
1164
1165 /* Flags for netgraph functions. */
1166 #define NG_NOFLAGS 0x00000000 /* no special options */
1167 #define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */
1168 #define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */
1169 /* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */
1170 #define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */
1171 #define NG_REUSE_ITEM 0x00000008 /* supplied item should be reused */
1172
1173 /*
1174 * prototypes the user should DEFINITELY not use directly
1175 */
1176 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1177 int ng_mod_event(module_t mod, int what, void *arg);
1178
1179 /*
1180 * Tag definitions and constants
1181 */
1182
1183 #define NG_TAG_PRIO 1
1184
1185 struct ng_tag_prio {
1186 struct m_tag tag;
1187 char priority;
1188 char discardability;
1189 };
1190
1191 #define NG_PRIO_CUTOFF 32
1192 #define NG_PRIO_LINKSTATE 64
1193
1194 /* Macros and declarations to keep compatibility with metadata, which
1195 * is obsoleted now. To be deleted.
1196 */
1197 typedef void *meta_p;
1198 #define _NGI_META(i) NULL
1199 #define NGI_META(i) NULL
1200 #define NG_FREE_META(meta)
1201 #define NGI_GET_META(i,m)
1202 #define ng_copy_meta(meta) NULL
1203
1204 /* Hash related definitions */
1205 #define NG_ID_HASH_SIZE 128 /* most systems wont need even this many */
1206 #define NG_NAME_HASH_SIZE 128 /* most systems wont need even this many */
1207
1208 /*
1209 * Mark the current thread when called from the outbound path of the
1210 * network stack, in order to enforce queuing on ng nodes calling into
1211 * the inbound network stack path.
1212 */
1213 #define NG_OUTBOUND_THREAD_REF() \
1214 curthread->td_ng_outbound++
1215 #define NG_OUTBOUND_THREAD_UNREF() \
1216 do { \
1217 curthread->td_ng_outbound--; \
1218 KASSERT(curthread->td_ng_outbound >= 0, \
1219 ("%s: negative td_ng_outbound", __func__)); \
1220 } while (0)
1221
1222 #endif /* _NETGRAPH_NETGRAPH_H_ */
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