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 * $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#include <sys/refcount.h>
55
56#ifdef HAVE_KERNEL_OPTION_HEADERS
57#include "opt_netgraph.h"
58#include "opt_kdb.h"
59#endif
60
61/* debugging options */
62#define NG_SEPARATE_MALLOC /* make modules use their own malloc types */
63
64/*
65 * This defines the in-kernel binary interface version.
66 * It is possible to change this but leave the external message
67 * API the same. Each type also has it's own cookies for versioning as well.
68 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
69 * modules.
70 */
71#define _NG_ABI_VERSION 12
72
73#ifdef NETGRAPH_DEBUG
74#define _NG_ABI_PREFIX1 0x10000
75#else
76#define _NG_ABI_PREFIX1 0
77#endif
78
79#ifdef INVARIANTS
80#define _NG_ABI_PREFIX2 0x20000
81#else
82#define _NG_ABI_PREFIX2 0
83#endif
84
85#define NG_ABI_VERSION (_NG_ABI_PREFIX1 + _NG_ABI_PREFIX2 + _NG_ABI_VERSION)
86
87/*
88 * Forward references for the basic structures so we can
89 * define the typedefs and use them in the structures themselves.
90 */
91struct ng_hook ;
92struct ng_node ;
93struct ng_item ;
94typedef struct ng_item *item_p;
95typedef struct ng_node *node_p;
96typedef struct ng_hook *hook_p;
97typedef struct ng_item const *item_cp;
98typedef struct ng_hook const *hook_cp;
99#ifdef NETGRAPH_DEBUG
100typedef struct ng_node *node_cp; /* annotated during debug */
101#else /* NETGRAPH_DEBUG */
102typedef struct ng_node const *node_cp;
103#endif /* NETGRAPH_DEBUG */
104
105/* node method definitions */
106typedef int ng_constructor_t(node_p node);
107typedef int ng_close_t(node_p node);
108typedef int ng_shutdown_t(node_p node);
109typedef int ng_newhook_t(node_p node, hook_p hook, const char *name);
110typedef hook_p ng_findhook_t(node_p node, const char *name);
111typedef int ng_connect_t(hook_p hook);
112typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
113typedef int ng_rcvdata_t(hook_p hook, item_p item);
114typedef int ng_disconnect_t(hook_p hook);
115typedef int ng_rcvitem (node_p node, hook_p hook, item_p item);
116
117/***********************************************************************
118 ***************** Hook Structure and Methods **************************
119 ***********************************************************************
120 *
121 * Structure of a hook
122 */
123struct ng_hook {
124 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */
125 void *hk_private; /* node dependent ID for this hook */
126 int hk_flags; /* info about this hook/link */
127 int hk_type; /* tbd: hook data link type */
128 struct ng_hook *hk_peer; /* the other end of this link */
129 struct ng_node *hk_node; /* The node this hook is attached to */
130 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */
131 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */
132 ng_rcvdata_t *hk_rcvdata; /* data comes here */
133 int hk_refs; /* dont actually free this till 0 */
134#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
135#define HK_MAGIC 0x78573011
136 int hk_magic;
137 char *lastfile;
138 int lastline;
139 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */
140#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
141};
142/* Flags for a hook */
143#define HK_INVALID 0x0001 /* don't trust it! */
144#define HK_QUEUE 0x0002 /* queue for later delivery */
145#define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */
146#define HK_DEAD 0x0008 /* This is the dead hook.. don't free */
147#define HK_HI_STACK 0x0010 /* Hook has hi stack usage */
148#define HK_TO_INBOUND 0x0020 /* Hook on ntw. stack inbound path. */
149
150/*
151 * Public Methods for hook
152 * If you can't do it with these you probably shouldn;t be doing it.
153 */
154void ng_unref_hook(hook_p hook); /* don't move this */
155#define _NG_HOOK_REF(hook) refcount_acquire(&(hook)->hk_refs)
156#define _NG_HOOK_NAME(hook) ((hook)->hk_name)
157#define _NG_HOOK_UNREF(hook) ng_unref_hook(hook)
158#define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
159#define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0)
160#define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
161#define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private)
162#define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID)
163#define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
164#define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */
165#define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */
166#define _NG_HOOK_FORCE_WRITER(hook) \
167 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
168#define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
169#define _NG_HOOK_SET_TO_INBOUND(hook) \
170 do { hook->hk_flags |= HK_TO_INBOUND; } while (0)
171#define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0)
172
173/* Some shortcuts */
174#define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook))
175#define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
176#define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
177
178#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
179#define _NN_ __FILE__,__LINE__
180void dumphook (hook_p hook, char *file, int line);
181static __inline void _chkhook(hook_p hook, char *file, int line);
182static __inline void _ng_hook_ref(hook_p hook, char * file, int line);
183static __inline char * _ng_hook_name(hook_p hook, char * file, int line);
184static __inline void _ng_hook_unref(hook_p hook, char * file, int line);
185static __inline void _ng_hook_set_private(hook_p hook,
186 void * val, char * file, int line);
187static __inline void _ng_hook_set_rcvmsg(hook_p hook,
188 ng_rcvmsg_t *val, char * file, int line);
189static __inline void _ng_hook_set_rcvdata(hook_p hook,
190 ng_rcvdata_t *val, char * file, int line);
191static __inline void * _ng_hook_private(hook_p hook, char * file, int line);
192static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line);
193static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line);
194static __inline node_p _ng_hook_node(hook_p hook, char * file, int line);
195static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line);
196static __inline void _ng_hook_force_writer(hook_p hook, char * file,
197 int line);
198static __inline void _ng_hook_force_queue(hook_p hook, char * file,
199 int line);
200static __inline void _ng_hook_set_to_inbound(hook_p hook, char * file,
201 int line);
202
203static __inline void
204_chkhook(hook_p hook, char *file, int line)
205{
206 if (hook->hk_magic != HK_MAGIC) {
207 printf("Accessing freed ");
208 dumphook(hook, file, line);
209 }
210 hook->lastline = line;
211 hook->lastfile = file;
212}
213
214static __inline void
215_ng_hook_ref(hook_p hook, char * file, int line)
216{
217 _chkhook(hook, file, line);
218 _NG_HOOK_REF(hook);
219}
220
221static __inline char *
222_ng_hook_name(hook_p hook, char * file, int line)
223{
224 _chkhook(hook, file, line);
225 return (_NG_HOOK_NAME(hook));
226}
227
228static __inline void
229_ng_hook_unref(hook_p hook, char * file, int line)
230{
231 _chkhook(hook, file, line);
232 _NG_HOOK_UNREF(hook);
233}
234
235static __inline void
236_ng_hook_set_private(hook_p hook, void *val, char * file, int line)
237{
238 _chkhook(hook, file, line);
239 _NG_HOOK_SET_PRIVATE(hook, val);
240}
241
242static __inline void
243_ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
244{
245 _chkhook(hook, file, line);
246 _NG_HOOK_SET_RCVMSG(hook, val);
247}
248
249static __inline void
250_ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
251{
252 _chkhook(hook, file, line);
253 _NG_HOOK_SET_RCVDATA(hook, val);
254}
255
256static __inline void *
257_ng_hook_private(hook_p hook, char * file, int line)
258{
259 _chkhook(hook, file, line);
260 return (_NG_HOOK_PRIVATE(hook));
261}
262
263static __inline int
264_ng_hook_not_valid(hook_p hook, char * file, int line)
265{
266 _chkhook(hook, file, line);
267 return (_NG_HOOK_NOT_VALID(hook));
268}
269
270static __inline int
271_ng_hook_is_valid(hook_p hook, char * file, int line)
272{
273 _chkhook(hook, file, line);
274 return (_NG_HOOK_IS_VALID(hook));
275}
276
277static __inline node_p
278_ng_hook_node(hook_p hook, char * file, int line)
279{
280 _chkhook(hook, file, line);
281 return (_NG_HOOK_NODE(hook));
282}
283
284static __inline hook_p
285_ng_hook_peer(hook_p hook, char * file, int line)
286{
287 _chkhook(hook, file, line);
288 return (_NG_HOOK_PEER(hook));
289}
290
291static __inline void
292_ng_hook_force_writer(hook_p hook, char * file, int line)
293{
294 _chkhook(hook, file, line);
295 _NG_HOOK_FORCE_WRITER(hook);
296}
297
298static __inline void
299_ng_hook_force_queue(hook_p hook, char * file, int line)
300{
301 _chkhook(hook, file, line);
302 _NG_HOOK_FORCE_QUEUE(hook);
303}
304
305static __inline void
306_ng_hook_set_to_inbound(hook_p hook, char * file, int line)
307{
308 _chkhook(hook, file, line);
309 _NG_HOOK_SET_TO_INBOUND(hook);
310}
311
312static __inline void
313_ng_hook_hi_stack(hook_p hook, char * file, int line)
314{
315 _chkhook(hook, file, line);
316 _NG_HOOK_HI_STACK(hook);
317}
318
319#define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_)
320#define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_)
321#define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_)
322#define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_)
323#define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_)
324#define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
325#define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_)
326#define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_)
327#define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_)
328#define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_)
329#define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_)
330#define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_)
331#define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_)
332#define NG_HOOK_SET_TO_INBOUND(hook) _ng_hook_set_to_inbound(hook, _NN_)
333#define NG_HOOK_HI_STACK(hook) _ng_hook_hi_stack(hook, _NN_)
334
335#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
336
337#define NG_HOOK_REF(hook) _NG_HOOK_REF(hook)
338#define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook)
339#define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook)
340#define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val)
341#define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val)
342#define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)
343#define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook)
344#define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook)
345#define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook)
346#define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook)
347#define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook)
348#define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook)
349#define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook)
350#define NG_HOOK_SET_TO_INBOUND(hook) _NG_HOOK_SET_TO_INBOUND(hook)
351#define NG_HOOK_HI_STACK(hook) _NG_HOOK_HI_STACK(hook)
352
353#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
354
355/***********************************************************************
356 ***************** Node Structure and Methods **************************
357 ***********************************************************************
358 * Structure of a node
359 * including the eembedded queue structure.
360 *
361 * The structure for queueing Netgraph request items
362 * embedded in the node structure
363 */
364struct ng_queue {
365 u_int q_flags; /* Current r/w/q lock flags */
366 u_int q_flags2; /* Other queue flags */
367 struct mtx q_mtx;
368 STAILQ_ENTRY(ng_node) q_work; /* nodes with work to do */
369 STAILQ_HEAD(, ng_item) queue; /* actually items queue */
370};
371
372struct ng_node {
373 char nd_name[NG_NODESIZ]; /* optional globally unique name */
374 struct ng_type *nd_type; /* the installed 'type' */
375 int nd_flags; /* see below for bit definitions */
376 int nd_numhooks; /* number of hooks */
377 void *nd_private; /* node type dependent node ID */
378 ng_ID_t nd_ID; /* Unique per node */
379 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */
380 LIST_ENTRY(ng_node) nd_nodes; /* name hash collision list */
381 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */
382 struct ng_queue nd_input_queue; /* input queue for locking */
383 int nd_refs; /* # of references to this node */
384 struct vnet *nd_vnet; /* network stack instance */
385#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
386#define ND_MAGIC 0x59264837
387 int nd_magic;
388 char *lastfile;
389 int lastline;
390 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */
391#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
392};
393
394/* Flags for a node */
395#define NGF_INVALID 0x00000001 /* free when refs go to 0 */
396#define NG_INVALID NGF_INVALID /* compat for old code */
397#define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */
398#define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
399#define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */
400#define NG_CLOSING NGF_CLOSING /* compat for old code */
401#define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */
402#define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */
403#define NGF_HI_STACK 0x00000020 /* node has hi stack usage */
404#define NGF_TYPE1 0x10000000 /* reserved for type specific storage */
405#define NGF_TYPE2 0x20000000 /* reserved for type specific storage */
406#define NGF_TYPE3 0x40000000 /* reserved for type specific storage */
407#define NGF_TYPE4 0x80000000 /* reserved for type specific storage */
408
409/*
410 * Public methods for nodes.
411 * If you can't do it with these you probably shouldn't be doing it.
412 */
413void ng_unref_node(node_p node); /* don't move this */
414#define _NG_NODE_NAME(node) ((node)->nd_name + 0)
415#define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
416#define _NG_NODE_ID(node) ((node)->nd_ID + 0)
417#define _NG_NODE_REF(node) refcount_acquire(&(node)->nd_refs)
418#define _NG_NODE_UNREF(node) ng_unref_node(node)
419#define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
420#define _NG_NODE_PRIVATE(node) ((node)->nd_private)
421#define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
422#define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID)
423#define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
424#define _NG_NODE_FORCE_WRITER(node) \
425 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
426#define _NG_NODE_HI_STACK(node) \
427 do{ node->nd_flags |= NGF_HI_STACK; }while (0)
428#define _NG_NODE_REALLY_DIE(node) \
429 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
430#define _NG_NODE_REVIVE(node) \
431 do { node->nd_flags &= ~NGF_INVALID; } while (0)
432/*
433 * The hook iterator.
434 * This macro will call a function of type ng_fn_eachhook for each
435 * hook attached to the node. If the function returns 0, then the
436 * iterator will stop and return a pointer to the hook that returned 0.
437 */
438typedef int ng_fn_eachhook(hook_p hook, void* arg);
439#define _NG_NODE_FOREACH_HOOK(node, fn, arg) \
440 do { \
441 hook_p _hook; \
442 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \
443 if ((fn)(_hook, arg) == 0) { \
444 break; \
445 } \
446 } \
447 } while (0)
448
449#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
450void dumpnode(node_p node, char *file, int line);
451static __inline void _chknode(node_p node, char *file, int line);
452static __inline char * _ng_node_name(node_p node, char *file, int line);
453static __inline int _ng_node_has_name(node_p node, char *file, int line);
454static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
455static __inline void _ng_node_ref(node_p node, char *file, int line);
456static __inline void _ng_node_unref(node_p node, char *file, int line);
457static __inline void _ng_node_set_private(node_p node, void * val,
458 char *file, int line);
459static __inline void * _ng_node_private(node_p node, char *file, int line);
460static __inline int _ng_node_is_valid(node_p node, char *file, int line);
461static __inline int _ng_node_not_valid(node_p node, char *file, int line);
462static __inline int _ng_node_numhooks(node_p node, char *file, int line);
463static __inline void _ng_node_force_writer(node_p node, char *file, int line);
464static __inline void _ng_node_foreach_hook(node_p node,
465 ng_fn_eachhook *fn, void *arg, char *file, int line);
466static __inline void _ng_node_revive(node_p node, char *file, int line);
467
468static __inline void
469_chknode(node_p node, char *file, int line)
470{
471 if (node->nd_magic != ND_MAGIC) {
472 printf("Accessing freed ");
473 dumpnode(node, file, line);
474 }
475 node->lastline = line;
476 node->lastfile = file;
477}
478
479static __inline char *
480_ng_node_name(node_p node, char *file, int line)
481{
482 _chknode(node, file, line);
483 return(_NG_NODE_NAME(node));
484}
485
486static __inline int
487_ng_node_has_name(node_p node, char *file, int line)
488{
489 _chknode(node, file, line);
490 return(_NG_NODE_HAS_NAME(node));
491}
492
493static __inline ng_ID_t
494_ng_node_id(node_p node, char *file, int line)
495{
496 _chknode(node, file, line);
497 return(_NG_NODE_ID(node));
498}
499
500static __inline void
501_ng_node_ref(node_p node, char *file, int line)
502{
503 _chknode(node, file, line);
504 _NG_NODE_REF(node);
505}
506
507static __inline void
508_ng_node_unref(node_p node, char *file, int line)
509{
510 _chknode(node, file, line);
511 _NG_NODE_UNREF(node);
512}
513
514static __inline void
515_ng_node_set_private(node_p node, void * val, char *file, int line)
516{
517 _chknode(node, file, line);
518 _NG_NODE_SET_PRIVATE(node, val);
519}
520
521static __inline void *
522_ng_node_private(node_p node, char *file, int line)
523{
524 _chknode(node, file, line);
525 return (_NG_NODE_PRIVATE(node));
526}
527
528static __inline int
529_ng_node_is_valid(node_p node, char *file, int line)
530{
531 _chknode(node, file, line);
532 return(_NG_NODE_IS_VALID(node));
533}
534
535static __inline int
536_ng_node_not_valid(node_p node, char *file, int line)
537{
538 _chknode(node, file, line);
539 return(_NG_NODE_NOT_VALID(node));
540}
541
542static __inline int
543_ng_node_numhooks(node_p node, char *file, int line)
544{
545 _chknode(node, file, line);
546 return(_NG_NODE_NUMHOOKS(node));
547}
548
549static __inline void
550_ng_node_force_writer(node_p node, char *file, int line)
551{
552 _chknode(node, file, line);
553 _NG_NODE_FORCE_WRITER(node);
554}
555
556static __inline void
557_ng_node_hi_stack(node_p node, char *file, int line)
558{
559 _chknode(node, file, line);
560 _NG_NODE_HI_STACK(node);
561}
562
563static __inline void
564_ng_node_really_die(node_p node, char *file, int line)
565{
566 _chknode(node, file, line);
567 _NG_NODE_REALLY_DIE(node);
568}
569
570static __inline void
571_ng_node_revive(node_p node, char *file, int line)
572{
573 _chknode(node, file, line);
574 _NG_NODE_REVIVE(node);
575}
576
577static __inline void
578_ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
579 char *file, int line)
580{
581 _chknode(node, file, line);
582 _NG_NODE_FOREACH_HOOK(node, fn, arg);
583}
584
585#define NG_NODE_NAME(node) _ng_node_name(node, _NN_)
586#define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_)
587#define NG_NODE_ID(node) _ng_node_id(node, _NN_)
588#define NG_NODE_REF(node) _ng_node_ref(node, _NN_)
589#define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_)
590#define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_)
591#define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_)
592#define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_)
593#define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_)
594#define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_)
595#define NG_NODE_HI_STACK(node) _ng_node_hi_stack(node, _NN_)
596#define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_)
597#define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_)
598#define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_)
599#define NG_NODE_FOREACH_HOOK(node, fn, arg) \
600 _ng_node_foreach_hook(node, fn, (void *)arg, _NN_)
601
602#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
603
604#define NG_NODE_NAME(node) _NG_NODE_NAME(node)
605#define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node)
606#define NG_NODE_ID(node) _NG_NODE_ID(node)
607#define NG_NODE_REF(node) _NG_NODE_REF(node)
608#define NG_NODE_UNREF(node) _NG_NODE_UNREF(node)
609#define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val)
610#define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node)
611#define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node)
612#define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node)
613#define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node)
614#define NG_NODE_HI_STACK(node) _NG_NODE_HI_STACK(node)
615#define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node)
616#define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node)
617#define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node)
618#define NG_NODE_FOREACH_HOOK(node, fn, arg) \
619 _NG_NODE_FOREACH_HOOK(node, fn, arg)
620#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
621
622/***********************************************************************
623 ************* Node Queue and Item Structures and Methods **************
624 ***********************************************************************
625 *
626 */
627typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
628typedef int ng_item_fn2(node_p node, struct ng_item *item, hook_p hook);
629typedef void ng_apply_t(void *context, int error);
630struct ng_apply_info {
631 ng_apply_t *apply;
632 void *context;
633 int refs;
634 int error;
635};
636struct ng_item {
637 u_long el_flags;
638 STAILQ_ENTRY(ng_item) el_next;
639 node_p el_dest; /* The node it will be applied against (or NULL) */
640 hook_p el_hook; /* Entering hook. Optional in Control messages */
641 union {
642 struct mbuf *da_m;
643 struct {
644 struct ng_mesg *msg_msg;
645 ng_ID_t msg_retaddr;
646 } msg;
647 struct {
648 union {
649 ng_item_fn *fn_fn;
650 ng_item_fn2 *fn_fn2;
651 } fn_fn;
652 void *fn_arg1;
653 int fn_arg2;
654 } fn;
655 } body;
656 /*
657 * Optional callback called when item is being applied,
658 * and its context.
659 */
660 struct ng_apply_info *apply;
661 u_int depth;
662#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
663 char *lastfile;
664 int lastline;
665 TAILQ_ENTRY(ng_item) all; /* all existing items */
666#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
667};
668
669#define NGQF_TYPE 0x03 /* MASK of content definition */
670#define NGQF_MESG 0x00 /* the queue element is a message */
671#define NGQF_DATA 0x01 /* the queue element is data */
672#define NGQF_FN 0x02 /* the queue element is a function */
673#define NGQF_FN2 0x03 /* the queue element is a new function */
674
675#define NGQF_RW 0x04 /* MASK for wanted queue mode */
676#define NGQF_READER 0x04 /* wants to be a reader */
677#define NGQF_WRITER 0x00 /* wants to be a writer */
678
679#define NGQF_QMODE 0x08 /* MASK for how it was queued */
680#define NGQF_QREADER 0x08 /* was queued as a reader */
681#define NGQF_QWRITER 0x00 /* was queued as a writer */
682
683/*
684 * Get the mbuf (etc) out of an item.
685 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
686 * with it, (to avoid freeing the things twice).
687 * If you don't want to zero out the item then realise that the
688 * item still owns it.
689 * Retaddr is different. There are no references on that. It's just a number.
690 * The debug versions must be either all used everywhere or not at all.
691 */
692
693#define _NGI_M(i) ((i)->body.da_m)
694#define _NGI_MSG(i) ((i)->body.msg.msg_msg)
695#define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
696#define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn)
697#define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2)
698#define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
699#define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
700#define _NGI_NODE(i) ((i)->el_dest)
701#define _NGI_HOOK(i) ((i)->el_hook)
702#define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
703#define _NGI_CLR_HOOK(i) do { \
704 hook_p _hook = _NGI_HOOK(i); \
705 if (_hook) { \
706 _NG_HOOK_UNREF(_hook); \
707 _NGI_HOOK(i) = NULL; \
708 } \
709 } while (0)
710#define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
711#define _NGI_CLR_NODE(i) do { \
712 node_p _node = _NGI_NODE(i); \
713 if (_node) { \
714 _NG_NODE_UNREF(_node); \
715 _NGI_NODE(i) = NULL; \
716 } \
717 } while (0)
718
719#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
720void dumpitem(item_p item, char *file, int line);
721static __inline void _ngi_check(item_p item, char *file, int line) ;
722static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ;
723static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line);
724static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
725static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ;
726static __inline ng_item_fn2 ** _ngi_fn2(item_p item, char *file, int line) ;
727static __inline void ** _ngi_arg1(item_p item, char *file, int line) ;
728static __inline int * _ngi_arg2(item_p item, char *file, int line) ;
729static __inline node_p _ngi_node(item_p item, char *file, int line);
730static __inline hook_p _ngi_hook(item_p item, char *file, int line);
731
732static __inline void
733_ngi_check(item_p item, char *file, int line)
734{
735 (item)->lastline = line;
736 (item)->lastfile = file;
737}
738
739static __inline struct mbuf **
740_ngi_m(item_p item, char *file, int line)
741{
742 _ngi_check(item, file, line);
743 return (&_NGI_M(item));
744}
745
746static __inline struct ng_mesg **
747_ngi_msg(item_p item, char *file, int line)
748{
749 _ngi_check(item, file, line);
750 return (&_NGI_MSG(item));
751}
752
753static __inline ng_ID_t *
754_ngi_retaddr(item_p item, char *file, int line)
755{
756 _ngi_check(item, file, line);
757 return (&_NGI_RETADDR(item));
758}
759
760static __inline ng_item_fn **
761_ngi_fn(item_p item, char *file, int line)
762{
763 _ngi_check(item, file, line);
764 return (&_NGI_FN(item));
765}
766
767static __inline ng_item_fn2 **
768_ngi_fn2(item_p item, char *file, int line)
769{
770 _ngi_check(item, file, line);
771 return (&_NGI_FN2(item));
772}
773
774static __inline void **
775_ngi_arg1(item_p item, char *file, int line)
776{
777 _ngi_check(item, file, line);
778 return (&_NGI_ARG1(item));
779}
780
781static __inline int *
782_ngi_arg2(item_p item, char *file, int line)
783{
784 _ngi_check(item, file, line);
785 return (&_NGI_ARG2(item));
786}
787
788static __inline node_p
789_ngi_node(item_p item, char *file, int line)
790{
791 _ngi_check(item, file, line);
792 return (_NGI_NODE(item));
793}
794
795static __inline hook_p
796_ngi_hook(item_p item, char *file, int line)
797{
798 _ngi_check(item, file, line);
799 return (_NGI_HOOK(item));
800}
801
802#define NGI_M(i) (*_ngi_m(i, _NN_))
803#define NGI_MSG(i) (*_ngi_msg(i, _NN_))
804#define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_))
805#define NGI_FN(i) (*_ngi_fn(i, _NN_))
806#define NGI_FN2(i) (*_ngi_fn2(i, _NN_))
807#define NGI_ARG1(i) (*_ngi_arg1(i, _NN_))
808#define NGI_ARG2(i) (*_ngi_arg2(i, _NN_))
809#define NGI_HOOK(i) _ngi_hook(i, _NN_)
810#define NGI_NODE(i) _ngi_node(i, _NN_)
811#define NGI_SET_HOOK(i,h) \
812 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
813#define NGI_CLR_HOOK(i) \
814 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
815#define NGI_SET_NODE(i,n) \
816 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
817#define NGI_CLR_NODE(i) \
818 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
819
820#define NG_FREE_ITEM(item) \
821 do { \
822 _ngi_check(item, _NN_); \
823 ng_free_item((item)); \
824 } while (0)
825
826#define SAVE_LINE(item) \
827 do { \
828 (item)->lastline = __LINE__; \
829 (item)->lastfile = __FILE__; \
830 } while (0)
831
832#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
833
834#define NGI_M(i) _NGI_M(i)
835#define NGI_MSG(i) _NGI_MSG(i)
836#define NGI_RETADDR(i) _NGI_RETADDR(i)
837#define NGI_FN(i) _NGI_FN(i)
838#define NGI_FN2(i) _NGI_FN2(i)
839#define NGI_ARG1(i) _NGI_ARG1(i)
840#define NGI_ARG2(i) _NGI_ARG2(i)
841#define NGI_NODE(i) _NGI_NODE(i)
842#define NGI_HOOK(i) _NGI_HOOK(i)
843#define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
844#define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i)
845#define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
846#define NGI_CLR_NODE(i) _NGI_CLR_NODE(i)
847
848#define NG_FREE_ITEM(item) ng_free_item((item))
849#define SAVE_LINE(item) do {} while (0)
850
851#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
852
853#define NGI_GET_M(i,m) \
854 do { \
855 (m) = NGI_M(i); \
856 _NGI_M(i) = NULL; \
857 } while (0)
858
859#define NGI_GET_MSG(i,m) \
860 do { \
861 (m) = NGI_MSG(i); \
862 _NGI_MSG(i) = NULL; \
863 } while (0)
864
865#define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \
866 do { \
867 (n) = NGI_NODE(i); \
868 _NGI_NODE(i) = NULL; \
869 } while (0)
870
871#define NGI_GET_HOOK(i,h) \
872 do { \
873 (h) = NGI_HOOK(i); \
874 _NGI_HOOK(i) = NULL; \
875 } while (0)
876
877#define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE)
878#define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER)
879
880#define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER)
881#define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
882
883/**********************************************************************
884* Data macros. Send, manipulate and free.
885**********************************************************************/
886/*
887 * Assuming the data is already ok, just set the new address and send
888 */
889#define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \
890 do { \
891 (error) = \
892 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \
893 if (error == 0) { \
894 SAVE_LINE(item); \
895 (error) = ng_snd_item((item), (flags)); \
896 } \
897 (item) = NULL; \
898 } while (0)
899#define NG_FWD_ITEM_HOOK(error, item, hook) \
900 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
901
902/*
903 * Forward a data packet. Mbuf pointer is updated to new value. We
904 * presume you dealt with the old one when you update it to the new one
905 * (or it maybe the old one). We got a packet and possibly had to modify
906 * the mbuf. You should probably use NGI_GET_M() if you are going to use
907 * this too.
908 */
909#define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \
910 do { \
911 NGI_M(item) = (m); \
912 (m) = NULL; \
913 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \
914 } while (0)
915#define NG_FWD_NEW_DATA(error, item, hook, m) \
916 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
917
918/* Send a previously unpackaged mbuf. XXX: This should be called
919 * NG_SEND_DATA in future, but this name is kept for compatibility
920 * reasons.
921 */
922#define NG_SEND_DATA_FLAGS(error, hook, m, flags) \
923 do { \
924 item_p _item; \
925 if ((_item = ng_package_data((m), flags))) { \
926 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
927 } else { \
928 (error) = ENOMEM; \
929 } \
930 (m) = NULL; \
931 } while (0)
932
933#define NG_SEND_DATA_ONLY(error, hook, m) \
934 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
935/* NG_SEND_DATA() compat for meta-data times */
936#define NG_SEND_DATA(error, hook, m, x) \
937 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
938
939#define NG_FREE_MSG(msg) \
940 do { \
941 if ((msg)) { \
942 free((msg), M_NETGRAPH_MSG); \
943 (msg) = NULL; \
944 } \
945 } while (0)
946
947#define NG_FREE_M(m) \
948 do { \
949 if ((m)) { \
950 m_freem((m)); \
951 (m) = NULL; \
952 } \
953 } while (0)
954
955/*****************************************
956* Message macros
957*****************************************/
958
959#define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \
960 do { \
961 item_p _item; \
962 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
963 (msg) = NULL; \
964 (error) = ENOMEM; \
965 break; \
966 } \
967 if (((error) = ng_address_hook((here), (_item), \
968 (hook), (retaddr))) == 0) { \
969 SAVE_LINE(_item); \
970 (error) = ng_snd_item((_item), 0); \
971 } \
972 (msg) = NULL; \
973 } while (0)
974
975#define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \
976 do { \
977 item_p _item; \
978 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
979 (msg) = NULL; \
980 (error) = ENOMEM; \
981 break; \
982 } \
983 if (((error) = ng_address_path((here), (_item), \
984 (path), (retaddr))) == 0) { \
985 SAVE_LINE(_item); \
986 (error) = ng_snd_item((_item), 0); \
987 } \
988 (msg) = NULL; \
989 } while (0)
990
991#define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \
992 do { \
993 item_p _item; \
994 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
995 (msg) = NULL; \
996 (error) = ENOMEM; \
997 break; \
998 } \
999 if (((error) = ng_address_ID((here), (_item), \
1000 (ID), (retaddr))) == 0) { \
1001 SAVE_LINE(_item); \
1002 (error) = ng_snd_item((_item), 0); \
1003 } \
1004 (msg) = NULL; \
1005 } while (0)
1006
1007/*
1008 * Redirect the message to the next hop using the given hook.
1009 * ng_retarget_msg() frees the item if there is an error
1010 * and returns an error code. It returns 0 on success.
1011 */
1012#define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \
1013 do { \
1014 if (((error) = ng_address_hook((here), (item), \
1015 (hook), (retaddr))) == 0) { \
1016 SAVE_LINE(item); \
1017 (error) = ng_snd_item((item), 0); \
1018 } \
1019 (item) = NULL; \
1020 } while (0)
1021
1022/*
1023 * Send a queue item back to it's originator with a response message.
1024 * Assume original message was removed and freed separatly.
1025 */
1026#define NG_RESPOND_MSG(error, here, item, resp) \
1027 do { \
1028 if (resp) { \
1029 ng_ID_t _dest = NGI_RETADDR(item); \
1030 NGI_RETADDR(item) = 0; \
1031 NGI_MSG(item) = resp; \
1032 if ((error = ng_address_ID((here), (item), \
1033 _dest, 0)) == 0) { \
1034 SAVE_LINE(item); \
1035 (error) = ng_snd_item((item), NG_QUEUE);\
1036 } \
1037 } else \
1038 NG_FREE_ITEM(item); \
1039 (item) = NULL; \
1040 } while (0)
1041
1042/***********************************************************************
1043 ******** Structures Definitions and Macros for defining a node *******
1044 ***********************************************************************
1045 *
1046 * Here we define the structures needed to actually define a new node
1047 * type.
1048 */
1049
1050/*
1051 * Command list -- each node type specifies the command that it knows
1052 * how to convert between ASCII and binary using an array of these.
1053 * The last element in the array must be a terminator with cookie=0.
1054 */
1055
1056struct ng_cmdlist {
1057 u_int32_t cookie; /* command typecookie */
1058 int cmd; /* command number */
1059 const char *name; /* command name */
1060 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */
1061 const struct ng_parse_type *respType; /* args if NGF_RESP */
1062};
1063
1064/*
1065 * Structure of a node type
1066 * If data is sent to the "rcvdata()" entrypoint then the system
1067 * may decide to defer it until later by queing it with the normal netgraph
1068 * input queuing system. This is decidde by the HK_QUEUE flag being set in
1069 * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1070 * ensure it is not requeued again.
1071 * Note the input queueing system is to allow modules
1072 * to 'release the stack' or to pass data across spl layers.
1073 * The data will be redelivered as soon as the NETISR code runs
1074 * which may be almost immediately. A node may also do it's own queueing
1075 * for other reasons (e.g. device output queuing).
1076 */
1077struct ng_type {
1078 u_int32_t version; /* must equal NG_API_VERSION */
1079 const char *name; /* Unique type name */
1080 modeventhand_t mod_event; /* Module event handler (optional) */
1081 ng_constructor_t *constructor; /* Node constructor */
1082 ng_rcvmsg_t *rcvmsg; /* control messages come here */
1083 ng_close_t *close; /* warn about forthcoming shutdown */
1084 ng_shutdown_t *shutdown; /* reset, and free resources */
1085 ng_newhook_t *newhook; /* first notification of new hook */
1086 ng_findhook_t *findhook; /* only if you have lots of hooks */
1087 ng_connect_t *connect; /* final notification of new hook */
1088 ng_rcvdata_t *rcvdata; /* data comes here */
1089 ng_disconnect_t *disconnect; /* notify on disconnect */
1090
1091 const struct ng_cmdlist *cmdlist; /* commands we can convert */
1092
1093 /* R/W data private to the base netgraph code DON'T TOUCH! */
1094 LIST_ENTRY(ng_type) types; /* linked list of all types */
1095 int refs; /* number of instances */
1096};
1097
1098/*
1099 * Use the NETGRAPH_INIT() macro to link a node type into the
1100 * netgraph system. This works for types compiled into the kernel
1101 * as well as KLD modules. The first argument should be the type
1102 * name (eg, echo) and the second a pointer to the type struct.
1103 *
1104 * If a different link time is desired, e.g., a device driver that
1105 * needs to install its netgraph type before probing, use the
1106 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably
1107 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
1108 */
1109
1110#define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \
1111static moduledata_t ng_##typename##_mod = { \
1112 "ng_" #typename, \
1113 ng_mod_event, \
1114 (typestructp) \
1115}; \
1116DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \
1117MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \
1118 NG_ABI_VERSION, \
1119 NG_ABI_VERSION)
1120
1121#define NETGRAPH_INIT(tn, tp) \
1122 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_MIDDLE)
1123
1124/* Special malloc() type for netgraph structs and ctrl messages */
1125/* Only these two types should be visible to nodes */
1126MALLOC_DECLARE(M_NETGRAPH);
1127MALLOC_DECLARE(M_NETGRAPH_MSG);
1128
1129/* declare the base of the netgraph sysclt hierarchy */
1130/* but only if this file cares about sysctls */
1131#ifdef SYSCTL_DECL
1132SYSCTL_DECL(_net_graph);
1133#endif
1134
1135/*
1136 * Methods that the nodes can use.
1137 * Many of these methods should usually NOT be used directly but via
1138 * Macros above.
1139 */
1140int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1141int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1142int ng_address_path(node_p here, item_p item, const char *address, ng_ID_t raddr);
1143int ng_bypass(hook_p hook1, hook_p hook2);
1144hook_p ng_findhook(node_p node, const char *name);
1145struct ng_type *ng_findtype(const char *type);
1146int ng_make_node_common(struct ng_type *typep, node_p *nodep);
1147int ng_name_node(node_p node, const char *name);
1148node_p ng_name2noderef(node_p node, const char *name);
1149int ng_newtype(struct ng_type *tp);
1150ng_ID_t ng_node2ID(node_cp node);
1151item_p ng_package_data(struct mbuf *m, int flags);
1152item_p ng_package_msg(struct ng_mesg *msg, int flags);
1153item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1154void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1155int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */
1156int ng_rmnode_self(node_p here); /* if a node wants to suicide */
1157int ng_rmtype(struct ng_type *tp);
1158int ng_snd_item(item_p item, int queue);
1159int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1160 int arg2);
1161int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1162 int arg2, int flags);
1163int ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn,
1164 void *arg1, int arg2, int flags);
1165int ng_uncallout(struct callout *c, node_p node);
1166int ng_uncallout_drain(struct callout *c, node_p node);
1167int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1168 ng_item_fn *fn, void * arg1, int arg2);
1169#define ng_callout_init(c) callout_init(c, 1)
1170
1171/* Flags for netgraph functions. */
1172#define NG_NOFLAGS 0x00000000 /* no special options */
1173#define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */
1174#define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */
1175/* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */
1176#define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */
1177#define NG_REUSE_ITEM 0x00000008 /* supplied item should be reused */
1178
1179/*
1180 * prototypes the user should DEFINITELY not use directly
1181 */
1182void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1183int ng_mod_event(module_t mod, int what, void *arg);
1184
1185/*
1186 * Tag definitions and constants
1187 */
1188
1189#define NG_TAG_PRIO 1
1190
1191struct ng_tag_prio {
1192 struct m_tag tag;
1193 char priority;
1194 char discardability;
1195};
1196
1197#define NG_PRIO_CUTOFF 32
1198#define NG_PRIO_LINKSTATE 64
1199
1200/* Macros and declarations to keep compatibility with metadata, which
1201 * is obsoleted now. To be deleted.
1202 */
1203typedef void *meta_p;
1204#define _NGI_META(i) NULL
1205#define NGI_META(i) NULL
1206#define NG_FREE_META(meta)
1207#define NGI_GET_META(i,m)
1208#define ng_copy_meta(meta) NULL
1209
1210/*
1211 * Mark the current thread when called from the outbound path of the
1212 * network stack, in order to enforce queuing on ng nodes calling into
1213 * the inbound network stack path.
1214 */
1215#define NG_OUTBOUND_THREAD_REF() \
1216 curthread->td_ng_outbound++
1217#define NG_OUTBOUND_THREAD_UNREF() \
1218 do { \
1219 curthread->td_ng_outbound--; \
1220 KASSERT(curthread->td_ng_outbound >= 0, \
1221 ("%s: negative td_ng_outbound", __func__)); \
1222 } while (0)
1223
1224#endif /* _NETGRAPH_NETGRAPH_H_ */