netgraph.h revision 141719
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: head/sys/netgraph/netgraph.h 141719 2005-02-12 09:52:36Z 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/* debugging options */ 57#define NETGRAPH_DEBUG 58#define NG_SEPARATE_MALLOC /* make modules use their own malloc types */ 59 60/* 61 * This defines the in-kernel binary interface version. 62 * It is possible to change this but leave the external message 63 * API the same. Each type also has it's own cookies for versioning as well. 64 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug 65 * modules. 66 */ 67#define _NG_ABI_VERSION 10 68#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 69#define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000) 70#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 71#define NG_ABI_VERSION _NG_ABI_VERSION 72#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 73 74 75/* 76 * Forward references for the basic structures so we can 77 * define the typedefs and use them in the structures themselves. 78 */ 79struct ng_hook ; 80struct ng_node ; 81struct ng_item ; 82typedef struct ng_item *item_p; 83typedef struct ng_node *node_p; 84typedef struct ng_hook *hook_p; 85 86/* node method definitions */ 87typedef int ng_constructor_t(node_p node); 88typedef int ng_close_t(node_p node); 89typedef int ng_shutdown_t(node_p node); 90typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 91typedef hook_p ng_findhook_t(node_p node, const char *name); 92typedef int ng_connect_t(hook_p hook); 93typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook); 94typedef int ng_rcvdata_t(hook_p hook, item_p item); 95typedef int ng_disconnect_t(hook_p hook); 96typedef int ng_rcvitem (node_p node, hook_p hook, item_p item); 97 98/*********************************************************************** 99 ***************** Hook Structure and Methods ************************** 100 *********************************************************************** 101 * 102 * Structure of a hook 103 */ 104struct ng_hook { 105 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */ 106 void *hk_private; /* node dependant ID for this hook */ 107 int hk_flags; /* info about this hook/link */ 108 int hk_refs; /* dont actually free this till 0 */ 109 struct ng_hook *hk_peer; /* the other end of this link */ 110 struct ng_node *hk_node; /* The node this hook is attached to */ 111 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */ 112 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */ 113 ng_rcvdata_t *hk_rcvdata; /* data comes here */ 114#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 115#define HK_MAGIC 0x78573011 116 int hk_magic; 117 char *lastfile; 118 int lastline; 119 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */ 120#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 121}; 122/* Flags for a hook */ 123#define HK_INVALID 0x0001 /* don't trust it! */ 124#define HK_QUEUE 0x0002 /* queue for later delivery */ 125#define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */ 126#define HK_DEAD 0x0008 /* This is the dead hook.. don't free */ 127 128/* 129 * Public Methods for hook 130 * If you can't do it with these you probably shouldn;t be doing it. 131 */ 132void ng_unref_hook(hook_p hook); /* don't move this */ 133#define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1) 134#define _NG_HOOK_NAME(hook) ((hook)->hk_name) 135#define _NG_HOOK_UNREF(hook) ng_unref_hook(hook) 136#define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0) 137#define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0) 138#define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0) 139#define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private) 140#define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID) 141#define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID)) 142#define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */ 143#define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */ 144#define _NG_HOOK_FORCE_WRITER(hook) \ 145 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0) 146#define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0) 147 148/* Some shortcuts */ 149#define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook)) 150#define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook)) 151#define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook)) 152 153#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 154#define _NN_ __FILE__,__LINE__ 155void dumphook (hook_p hook, char *file, int line); 156static __inline void _chkhook(hook_p hook, char *file, int line); 157static __inline void _ng_hook_ref(hook_p hook, char * file, int line); 158static __inline char * _ng_hook_name(hook_p hook, char * file, int line); 159static __inline void _ng_hook_unref(hook_p hook, char * file, int line); 160static __inline void _ng_hook_set_private(hook_p hook, 161 void * val, char * file, int line); 162static __inline void _ng_hook_set_rcvmsg(hook_p hook, 163 ng_rcvmsg_t *val, char * file, int line); 164static __inline void _ng_hook_set_rcvdata(hook_p hook, 165 ng_rcvdata_t *val, char * file, int line); 166static __inline void * _ng_hook_private(hook_p hook, char * file, int line); 167static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line); 168static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line); 169static __inline node_p _ng_hook_node(hook_p hook, char * file, int line); 170static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line); 171static __inline void _ng_hook_force_writer(hook_p hook, char * file, 172 int line); 173static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line); 174 175static void __inline 176_chkhook(hook_p hook, char *file, int line) 177{ 178 if (hook->hk_magic != HK_MAGIC) { 179 printf("Accessing freed hook "); 180 dumphook(hook, file, line); 181 } 182 hook->lastline = line; 183 hook->lastfile = file; 184} 185 186static __inline void 187_ng_hook_ref(hook_p hook, char * file, int line) 188{ 189 _chkhook(hook, file, line); 190 _NG_HOOK_REF(hook); 191} 192 193static __inline char * 194_ng_hook_name(hook_p hook, char * file, int line) 195{ 196 _chkhook(hook, file, line); 197 return (_NG_HOOK_NAME(hook)); 198} 199 200static __inline void 201_ng_hook_unref(hook_p hook, char * file, int line) 202{ 203 _chkhook(hook, file, line); 204 _NG_HOOK_UNREF(hook); 205} 206 207static __inline void 208_ng_hook_set_private(hook_p hook, void *val, char * file, int line) 209{ 210 _chkhook(hook, file, line); 211 _NG_HOOK_SET_PRIVATE(hook, val); 212} 213 214static __inline void 215_ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line) 216{ 217 _chkhook(hook, file, line); 218 _NG_HOOK_SET_RCVMSG(hook, val); 219} 220 221static __inline void 222_ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line) 223{ 224 _chkhook(hook, file, line); 225 _NG_HOOK_SET_RCVDATA(hook, val); 226} 227 228static __inline void * 229_ng_hook_private(hook_p hook, char * file, int line) 230{ 231 _chkhook(hook, file, line); 232 return (_NG_HOOK_PRIVATE(hook)); 233} 234 235static __inline int 236_ng_hook_not_valid(hook_p hook, char * file, int line) 237{ 238 _chkhook(hook, file, line); 239 return (_NG_HOOK_NOT_VALID(hook)); 240} 241 242static __inline int 243_ng_hook_is_valid(hook_p hook, char * file, int line) 244{ 245 _chkhook(hook, file, line); 246 return (_NG_HOOK_IS_VALID(hook)); 247} 248 249static __inline node_p 250_ng_hook_node(hook_p hook, char * file, int line) 251{ 252 _chkhook(hook, file, line); 253 return (_NG_HOOK_NODE(hook)); 254} 255 256static __inline hook_p 257_ng_hook_peer(hook_p hook, char * file, int line) 258{ 259 _chkhook(hook, file, line); 260 return (_NG_HOOK_PEER(hook)); 261} 262 263static __inline void 264_ng_hook_force_writer(hook_p hook, char * file, int line) 265{ 266 _chkhook(hook, file, line); 267 _NG_HOOK_FORCE_WRITER(hook); 268} 269 270static __inline void 271_ng_hook_force_queue(hook_p hook, char * file, int line) 272{ 273 _chkhook(hook, file, line); 274 _NG_HOOK_FORCE_QUEUE(hook); 275} 276 277 278#define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_) 279#define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_) 280#define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_) 281#define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_) 282#define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_) 283#define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_) 284#define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_) 285#define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_) 286#define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_) 287#define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_) 288#define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_) 289#define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_) 290#define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_) 291 292#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 293 294#define NG_HOOK_REF(hook) _NG_HOOK_REF(hook) 295#define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook) 296#define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook) 297#define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val) 298#define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val) 299#define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val) 300#define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook) 301#define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook) 302#define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook) 303#define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook) 304#define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook) 305#define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook) 306#define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook) 307 308#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 309 310/*********************************************************************** 311 ***************** Node Structure and Methods ************************** 312 *********************************************************************** 313 * Structure of a node 314 * including the eembedded queue structure. 315 * 316 * The structure for queueing Netgraph request items 317 * embedded in the node structure 318 */ 319struct ng_queue { 320 u_long q_flags; 321 struct mtx q_mtx; 322 item_p queue; 323 item_p *last; 324 struct ng_node *q_node; /* find the front of the node.. */ 325}; 326 327struct ng_node { 328 char nd_name[NG_NODESIZ]; /* optional globally unique name */ 329 struct ng_type *nd_type; /* the installed 'type' */ 330 int nd_flags; /* see below for bit definitions */ 331 int nd_refs; /* # of references to this node */ 332 int nd_numhooks; /* number of hooks */ 333 void *nd_private; /* node type dependant node ID */ 334 ng_ID_t nd_ID; /* Unique per node */ 335 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */ 336 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */ 337 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */ 338 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */ 339 struct ng_queue nd_input_queue; /* input queue for locking */ 340#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 341#define ND_MAGIC 0x59264837 342 int nd_magic; 343 char *lastfile; 344 int lastline; 345 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */ 346#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 347}; 348 349/* Flags for a node */ 350#define NGF_INVALID 0x00000001 /* free when refs go to 0 */ 351#define NG_INVALID NGF_INVALID /* compat for old code */ 352#define NGF_WORKQ 0x00000002 /* node is on the work queue */ 353#define NG_WORKQ NGF_WORKQ /* compat for old code */ 354#define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */ 355#define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */ 356#define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */ 357#define NG_CLOSING NGF_CLOSING /* compat for old code */ 358#define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */ 359#define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */ 360#define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 361#define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 362#define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 363#define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 364 365/* 366 * Public methods for nodes. 367 * If you can't do it with these you probably shouldn't be doing it. 368 */ 369int ng_unref_node(node_p node); /* don't move this */ 370#define _NG_NODE_NAME(node) ((node)->nd_name + 0) 371#define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0) 372#define _NG_NODE_ID(node) ((node)->nd_ID + 0) 373#define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1) 374#define _NG_NODE_UNREF(node) ng_unref_node(node) 375#define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0) 376#define _NG_NODE_PRIVATE(node) ((node)->nd_private) 377#define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID)) 378#define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID) 379#define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */ 380#define _NG_NODE_FORCE_WRITER(node) \ 381 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0) 382#define _NG_NODE_REALLY_DIE(node) \ 383 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0) 384#define _NG_NODE_REVIVE(node) \ 385 do { node->nd_flags &= ~NGF_INVALID; } while (0) 386/* 387 * The hook iterator. 388 * This macro will call a function of type ng_fn_eachhook for each 389 * hook attached to the node. If the function returns 0, then the 390 * iterator will stop and return a pointer to the hook that returned 0. 391 */ 392typedef int ng_fn_eachhook(hook_p hook, void* arg); 393#define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 394 do { \ 395 hook_p _hook; \ 396 (rethook) = NULL; \ 397 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \ 398 if ((fn)(_hook, arg) == 0) { \ 399 (rethook) = _hook; \ 400 break; \ 401 } \ 402 } \ 403 } while (0) 404 405#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 406void dumpnode(node_p node, char *file, int line); 407static void __inline _chknode(node_p node, char *file, int line); 408static __inline char * _ng_node_name(node_p node, char *file, int line); 409static __inline int _ng_node_has_name(node_p node, char *file, int line); 410static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line); 411void ng_ref_node(node_p node); 412static __inline void _ng_node_ref(node_p node, char *file, int line); 413static __inline int _ng_node_unref(node_p node, char *file, int line); 414static __inline void _ng_node_set_private(node_p node, void * val, 415 char *file, int line); 416static __inline void * _ng_node_private(node_p node, char *file, int line); 417static __inline int _ng_node_is_valid(node_p node, char *file, int line); 418static __inline int _ng_node_not_valid(node_p node, char *file, int line); 419static __inline int _ng_node_numhooks(node_p node, char *file, int line); 420static __inline void _ng_node_force_writer(node_p node, char *file, int line); 421static __inline hook_p _ng_node_foreach_hook(node_p node, 422 ng_fn_eachhook *fn, void *arg, char *file, int line); 423static __inline void _ng_node_revive(node_p node, char *file, int line); 424 425static void __inline 426_chknode(node_p node, char *file, int line) 427{ 428 if (node->nd_magic != ND_MAGIC) { 429 printf("Accessing freed node "); 430 dumpnode(node, file, line); 431 } 432 node->lastline = line; 433 node->lastfile = file; 434} 435 436static __inline char * 437_ng_node_name(node_p node, char *file, int line) 438{ 439 _chknode(node, file, line); 440 return(_NG_NODE_NAME(node)); 441} 442 443static __inline int 444_ng_node_has_name(node_p node, char *file, int line) 445{ 446 _chknode(node, file, line); 447 return(_NG_NODE_HAS_NAME(node)); 448} 449 450static __inline ng_ID_t 451_ng_node_id(node_p node, char *file, int line) 452{ 453 _chknode(node, file, line); 454 return(_NG_NODE_ID(node)); 455} 456 457static __inline void 458_ng_node_ref(node_p node, char *file, int line) 459{ 460 _chknode(node, file, line); 461 /*_NG_NODE_REF(node);*/ 462 ng_ref_node(node); 463} 464 465static __inline int 466_ng_node_unref(node_p node, char *file, int line) 467{ 468 _chknode(node, file, line); 469 return (_NG_NODE_UNREF(node)); 470} 471 472static __inline void 473_ng_node_set_private(node_p node, void * val, char *file, int line) 474{ 475 _chknode(node, file, line); 476 _NG_NODE_SET_PRIVATE(node, val); 477} 478 479static __inline void * 480_ng_node_private(node_p node, char *file, int line) 481{ 482 _chknode(node, file, line); 483 return (_NG_NODE_PRIVATE(node)); 484} 485 486static __inline int 487_ng_node_is_valid(node_p node, char *file, int line) 488{ 489 _chknode(node, file, line); 490 return(_NG_NODE_IS_VALID(node)); 491} 492 493static __inline int 494_ng_node_not_valid(node_p node, char *file, int line) 495{ 496 _chknode(node, file, line); 497 return(_NG_NODE_NOT_VALID(node)); 498} 499 500static __inline int 501_ng_node_numhooks(node_p node, char *file, int line) 502{ 503 _chknode(node, file, line); 504 return(_NG_NODE_NUMHOOKS(node)); 505} 506 507static __inline void 508_ng_node_force_writer(node_p node, char *file, int line) 509{ 510 _chknode(node, file, line); 511 _NG_NODE_FORCE_WRITER(node); 512} 513 514static __inline void 515_ng_node_really_die(node_p node, char *file, int line) 516{ 517 _chknode(node, file, line); 518 _NG_NODE_REALLY_DIE(node); 519} 520 521static __inline void 522_ng_node_revive(node_p node, char *file, int line) 523{ 524 _chknode(node, file, line); 525 _NG_NODE_REVIVE(node); 526} 527 528static __inline hook_p 529_ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg, 530 char *file, int line) 531{ 532 hook_p hook; 533 _chknode(node, file, line); 534 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook); 535 return (hook); 536} 537 538#define NG_NODE_NAME(node) _ng_node_name(node, _NN_) 539#define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_) 540#define NG_NODE_ID(node) _ng_node_id(node, _NN_) 541#define NG_NODE_REF(node) _ng_node_ref(node, _NN_) 542#define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_) 543#define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_) 544#define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_) 545#define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_) 546#define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_) 547#define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_) 548#define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_) 549#define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_) 550#define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_) 551#define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 552 do { \ 553 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \ 554 } while (0) 555 556#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 557 558#define NG_NODE_NAME(node) _NG_NODE_NAME(node) 559#define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node) 560#define NG_NODE_ID(node) _NG_NODE_ID(node) 561#define NG_NODE_REF(node) _NG_NODE_REF(node) 562#define NG_NODE_UNREF(node) _NG_NODE_UNREF(node) 563#define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val) 564#define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node) 565#define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node) 566#define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node) 567#define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node) 568#define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node) 569#define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node) 570#define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node) 571#define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 572 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) 573#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 574 575/*********************************************************************** 576 ************* Node Queue and Item Structures and Methods ************** 577 *********************************************************************** 578 * 579 */ 580typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2); 581struct ng_item { 582 u_long el_flags; 583 item_p el_next; 584 node_p el_dest; /* The node it will be applied against (or NULL) */ 585 hook_p el_hook; /* Entering hook. Optional in Control messages */ 586 union { 587 struct mbuf *da_m; 588 struct { 589 struct ng_mesg *msg_msg; 590 ng_ID_t msg_retaddr; 591 } msg; 592 struct { 593 ng_item_fn *fn_fn; 594 void *fn_arg1; 595 int fn_arg2; 596 } fn; 597 } body; 598#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 599 char *lastfile; 600 int lastline; 601 TAILQ_ENTRY(ng_item) all; /* all existing items */ 602#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 603}; 604 605#define NGQF_TYPE 0x03 /* MASK of content definition */ 606#define NGQF_MESG 0x00 /* the queue element is a message */ 607#define NGQF_DATA 0x01 /* the queue element is data */ 608#define NGQF_FN 0x02 /* the queue element is a function */ 609#define NGQF_UNDEF 0x03 /* UNDEFINED */ 610 611#define NGQF_RW 0x04 /* MASK for queue entry read/write */ 612#define NGQF_READER 0x04 /* queued as a reader */ 613#define NGQF_WRITER 0x00 /* queued as a writer */ 614 615#define NGQF_FREE 0x08 616 617/* 618 * Get the mbuf (etc) out of an item. 619 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM() 620 * with it, (to avoid freeing the things twice). 621 * If you don't want to zero out the item then realise that the 622 * item still owns it. 623 * Retaddr is different. There are no references on that. It's just a number. 624 * The debug versions must be either all used everywhere or not at all. 625 */ 626 627#define _NGI_M(i) ((i)->body.da_m) 628#define _NGI_MSG(i) ((i)->body.msg.msg_msg) 629#define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr) 630#define _NGI_FN(i) ((i)->body.fn.fn_fn) 631#define _NGI_ARG1(i) ((i)->body.fn.fn_arg1) 632#define _NGI_ARG2(i) ((i)->body.fn.fn_arg2) 633#define _NGI_NODE(i) ((i)->el_dest) 634#define _NGI_HOOK(i) ((i)->el_hook) 635#define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0) 636#define _NGI_CLR_HOOK(i) do { \ 637 hook_p _hook = _NGI_HOOK(i); \ 638 if (_hook) { \ 639 _NG_HOOK_UNREF(_hook); \ 640 _NGI_HOOK(i) = NULL; \ 641 } \ 642 } while (0) 643#define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0) 644#define _NGI_CLR_NODE(i) do { \ 645 node_p _node = _NGI_NODE(i); \ 646 if (_node) { \ 647 _NG_NODE_UNREF(_node); \ 648 _NGI_NODE(i) = NULL; \ 649 } \ 650 } while (0) 651 652#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 653void dumpitem(item_p item, char *file, int line); 654static __inline void _ngi_check(item_p item, char *file, int line) ; 655static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ; 656static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line); 657static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ; 658static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ; 659static __inline void ** _ngi_arg1(item_p item, char *file, int line) ; 660static __inline int * _ngi_arg2(item_p item, char *file, int line) ; 661static __inline node_p _ngi_node(item_p item, char *file, int line); 662static __inline hook_p _ngi_hook(item_p item, char *file, int line); 663 664static __inline void 665_ngi_check(item_p item, char *file, int line) 666{ 667 if (item->el_flags & NGQF_FREE) { 668 dumpitem(item, file, line); 669 panic ("free item!"); 670 } 671 (item)->lastline = line; 672 (item)->lastfile = file; 673} 674 675static __inline struct mbuf ** 676_ngi_m(item_p item, char *file, int line) 677{ 678 _ngi_check(item, file, line); 679 return (&_NGI_M(item)); 680} 681 682static __inline struct ng_mesg ** 683_ngi_msg(item_p item, char *file, int line) 684{ 685 _ngi_check(item, file, line); 686 return (&_NGI_MSG(item)); 687} 688 689static __inline ng_ID_t * 690_ngi_retaddr(item_p item, char *file, int line) 691{ 692 _ngi_check(item, file, line); 693 return (&_NGI_RETADDR(item)); 694} 695 696static __inline ng_item_fn ** 697_ngi_fn(item_p item, char *file, int line) 698{ 699 _ngi_check(item, file, line); 700 return (&_NGI_FN(item)); 701} 702 703static __inline void ** 704_ngi_arg1(item_p item, char *file, int line) 705{ 706 _ngi_check(item, file, line); 707 return (&_NGI_ARG1(item)); 708} 709 710static __inline int * 711_ngi_arg2(item_p item, char *file, int line) 712{ 713 _ngi_check(item, file, line); 714 return (&_NGI_ARG2(item)); 715} 716 717static __inline node_p 718_ngi_node(item_p item, char *file, int line) 719{ 720 _ngi_check(item, file, line); 721 return (_NGI_NODE(item)); 722} 723 724static __inline hook_p 725_ngi_hook(item_p item, char *file, int line) 726{ 727 _ngi_check(item, file, line); 728 return (_NGI_HOOK(item)); 729} 730 731#define NGI_M(i) (*_ngi_m(i, _NN_)) 732#define NGI_MSG(i) (*_ngi_msg(i, _NN_)) 733#define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_)) 734#define NGI_FN(i) (*_ngi_fn(i, _NN_)) 735#define NGI_ARG1(i) (*_ngi_arg1(i, _NN_)) 736#define NGI_ARG2(i) (*_ngi_arg2(i, _NN_)) 737#define NGI_HOOK(i) _ngi_hook(i, _NN_) 738#define NGI_NODE(i) _ngi_node(i, _NN_) 739#define NGI_SET_HOOK(i,h) \ 740 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0) 741#define NGI_CLR_HOOK(i) \ 742 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0) 743#define NGI_SET_NODE(i,n) \ 744 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0) 745#define NGI_CLR_NODE(i) \ 746 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0) 747 748#define NG_FREE_ITEM(item) \ 749 do { \ 750 _ngi_check(item, _NN_); \ 751 ng_free_item((item)); \ 752 } while (0) 753 754#define SAVE_LINE(item) \ 755 do { \ 756 (item)->lastline = __LINE__; \ 757 (item)->lastfile = __FILE__; \ 758 } while (0) 759 760#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 761 762#define NGI_M(i) _NGI_M(i) 763#define NGI_MSG(i) _NGI_MSG(i) 764#define NGI_RETADDR(i) _NGI_RETADDR(i) 765#define NGI_FN(i) _NGI_FN(i) 766#define NGI_ARG1(i) _NGI_ARG1(i) 767#define NGI_ARG2(i) _NGI_ARG2(i) 768#define NGI_NODE(i) _NGI_NODE(i) 769#define NGI_HOOK(i) _NGI_HOOK(i) 770#define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h) 771#define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i) 772#define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n) 773#define NGI_CLR_NODE(i) _NGI_CLR_NODE(i) 774 775#define NG_FREE_ITEM(item) ng_free_item((item)) 776#define SAVE_LINE(item) do {} while (0) 777 778#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 779 780#define NGI_GET_M(i,m) \ 781 do { \ 782 (m) = NGI_M(i); \ 783 _NGI_M(i) = NULL; \ 784 } while (0) 785 786#define NGI_GET_MSG(i,m) \ 787 do { \ 788 (m) = NGI_MSG(i); \ 789 _NGI_MSG(i) = NULL; \ 790 } while (0) 791 792#define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \ 793 do { \ 794 (n) = NGI_NODE(i); \ 795 _NGI_NODE(i) = NULL; \ 796 } while (0) 797 798#define NGI_GET_HOOK(i,h) \ 799 do { \ 800 (h) = NGI_HOOK(i); \ 801 _NGI_HOOK(i) = NULL; \ 802 } while (0) 803 804 805/********************************************************************** 806* Data macros. Send, manipulate and free. 807**********************************************************************/ 808/* 809 * Assuming the data is already ok, just set the new address and send 810 */ 811#define NG_FWD_ITEM_HOOK(error, item, hook) \ 812 do { \ 813 (error) = \ 814 ng_address_hook(NULL, (item), (hook), 0); \ 815 if (error == 0) { \ 816 SAVE_LINE(item); \ 817 (error) = ng_snd_item((item), 0); \ 818 } \ 819 (item) = NULL; \ 820 } while (0) 821 822/* 823 * Forward a data packet. Mbuf pointer is updated to new value. We 824 * presume you dealt with the old one when you update it to the new one 825 * (or it maybe the old one). We got a packet and possibly had to modify 826 * the mbuf. You should probably use NGI_GET_M() if you are going to use 827 * this too. 828 */ 829#define NG_FWD_NEW_DATA(error, item, hook, m) \ 830 do { \ 831 NGI_M(item) = (m); \ 832 (m) = NULL; \ 833 NG_FWD_ITEM_HOOK(error, item, hook); \ 834 } while (0) 835 836/* Send a previously unpackaged mbuf. XXX: This should be called 837 * NG_SEND_DATA in future, but this name is kept for compatibility 838 * reasons. 839 */ 840#define NG_SEND_DATA_ONLY(error, hook, m) \ 841 do { \ 842 item_p _item; \ 843 if ((_item = ng_package_data((m), NULL))) { \ 844 NG_FWD_ITEM_HOOK(error, _item, hook); \ 845 } else { \ 846 (error) = ENOMEM; \ 847 } \ 848 (m) = NULL; \ 849 } while (0) 850 851#define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m) 852 853#define NG_FREE_MSG(msg) \ 854 do { \ 855 if ((msg)) { \ 856 FREE((msg), M_NETGRAPH_MSG); \ 857 (msg) = NULL; \ 858 } \ 859 } while (0) 860 861#define NG_FREE_M(m) \ 862 do { \ 863 if ((m)) { \ 864 m_freem((m)); \ 865 (m) = NULL; \ 866 } \ 867 } while (0) 868 869/***************************************** 870* Message macros 871*****************************************/ 872 873#define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \ 874 do { \ 875 item_p _item; \ 876 if ((_item = ng_package_msg(msg)) == NULL) { \ 877 (msg) = NULL; \ 878 (error) = ENOMEM; \ 879 break; \ 880 } \ 881 if (((error) = ng_address_hook((here), (_item), \ 882 (hook), (retaddr))) == 0) { \ 883 SAVE_LINE(_item); \ 884 (error) = ng_snd_item((_item), 0); \ 885 } \ 886 (msg) = NULL; \ 887 } while (0) 888 889#define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \ 890 do { \ 891 item_p _item; \ 892 if ((_item = ng_package_msg(msg)) == NULL) { \ 893 (msg) = NULL; \ 894 (error) = ENOMEM; \ 895 break; \ 896 } \ 897 if (((error) = ng_address_path((here), (_item), \ 898 (path), (retaddr))) == 0) { \ 899 SAVE_LINE(_item); \ 900 (error) = ng_snd_item((_item), 0); \ 901 } \ 902 (msg) = NULL; \ 903 } while (0) 904 905#define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \ 906 do { \ 907 item_p _item; \ 908 if ((_item = ng_package_msg(msg)) == NULL) { \ 909 (msg) = NULL; \ 910 (error) = ENOMEM; \ 911 break; \ 912 } \ 913 if (((error) = ng_address_ID((here), (_item), \ 914 (ID), (retaddr))) == 0) { \ 915 SAVE_LINE(_item); \ 916 (error) = ng_snd_item((_item), 0); \ 917 } \ 918 (msg) = NULL; \ 919 } while (0) 920 921/* 922 * Redirect the message to the next hop using the given hook. 923 * ng_retarget_msg() frees the item if there is an error 924 * and returns an error code. It returns 0 on success. 925 */ 926#define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \ 927 do { \ 928 if (((error) = ng_address_hook((here), (item), \ 929 (hook), (retaddr))) == 0) { \ 930 SAVE_LINE(item); \ 931 (error) = ng_snd_item((item), 0); \ 932 } \ 933 (item) = NULL; \ 934 } while (0) 935 936/* 937 * Send a queue item back to it's originator with a response message. 938 * Assume original message was removed and freed separatly. 939 */ 940#define NG_RESPOND_MSG(error, here, item, resp) \ 941 do { \ 942 if (resp) { \ 943 ng_ID_t _dest = NGI_RETADDR(item); \ 944 NGI_RETADDR(item) = 0; \ 945 NGI_MSG(item) = resp; \ 946 if ((ng_address_ID((here), (item), \ 947 _dest, 0)) == 0) { \ 948 SAVE_LINE(item); \ 949 (error) = ng_snd_item((item), 1); \ 950 } else { \ 951 (error) = EINVAL; \ 952 } \ 953 } else { \ 954 NG_FREE_ITEM(item); \ 955 } \ 956 (item) = NULL; \ 957 } while (0) 958 959 960/*********************************************************************** 961 ******** Structures Definitions and Macros for defining a node ******* 962 *********************************************************************** 963 * 964 * Here we define the structures needed to actually define a new node 965 * type. 966 */ 967 968/* 969 * Command list -- each node type specifies the command that it knows 970 * how to convert between ASCII and binary using an array of these. 971 * The last element in the array must be a terminator with cookie=0. 972 */ 973 974struct ng_cmdlist { 975 u_int32_t cookie; /* command typecookie */ 976 int cmd; /* command number */ 977 const char *name; /* command name */ 978 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 979 const struct ng_parse_type *respType; /* args if NGF_RESP */ 980}; 981 982/* 983 * Structure of a node type 984 * If data is sent to the "rcvdata()" entrypoint then the system 985 * may decide to defer it until later by queing it with the normal netgraph 986 * input queuing system. This is decidde by the HK_QUEUE flag being set in 987 * the flags word of the peer (receiving) hook. The dequeuing mechanism will 988 * ensure it is not requeued again. 989 * Note the input queueing system is to allow modules 990 * to 'release the stack' or to pass data across spl layers. 991 * The data will be redelivered as soon as the NETISR code runs 992 * which may be almost immediatly. A node may also do it's own queueing 993 * for other reasons (e.g. device output queuing). 994 */ 995struct ng_type { 996 997 u_int32_t version; /* must equal NG_API_VERSION */ 998 const char *name; /* Unique type name */ 999 modeventhand_t mod_event; /* Module event handler (optional) */ 1000 ng_constructor_t *constructor; /* Node constructor */ 1001 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 1002 ng_close_t *close; /* warn about forthcoming shutdown */ 1003 ng_shutdown_t *shutdown; /* reset, and free resources */ 1004 ng_newhook_t *newhook; /* first notification of new hook */ 1005 ng_findhook_t *findhook; /* only if you have lots of hooks */ 1006 ng_connect_t *connect; /* final notification of new hook */ 1007 ng_rcvdata_t *rcvdata; /* data comes here */ 1008 ng_disconnect_t *disconnect; /* notify on disconnect */ 1009 1010 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 1011 1012 /* R/W data private to the base netgraph code DON'T TOUCH! */ 1013 LIST_ENTRY(ng_type) types; /* linked list of all types */ 1014 int refs; /* number of instances */ 1015}; 1016 1017/* 1018 * Use the NETGRAPH_INIT() macro to link a node type into the 1019 * netgraph system. This works for types compiled into the kernel 1020 * as well as KLD modules. The first argument should be the type 1021 * name (eg, echo) and the second a pointer to the type struct. 1022 * 1023 * If a different link time is desired, e.g., a device driver that 1024 * needs to install its netgraph type before probing, use the 1025 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably 1026 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO. 1027 */ 1028 1029#define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 1030static moduledata_t ng_##typename##_mod = { \ 1031 "ng_" #typename, \ 1032 ng_mod_event, \ 1033 (typestructp) \ 1034}; \ 1035DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \ 1036MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \ 1037 NG_ABI_VERSION, \ 1038 NG_ABI_VERSION) 1039 1040#define NETGRAPH_INIT(tn, tp) \ 1041 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 1042 1043/* Special malloc() type for netgraph structs and ctrl messages */ 1044/* Only these two types should be visible to nodes */ 1045MALLOC_DECLARE(M_NETGRAPH); 1046MALLOC_DECLARE(M_NETGRAPH_MSG); 1047 1048/* declare the base of the netgraph sysclt hierarchy */ 1049/* but only if this file cares about sysctls */ 1050#ifdef SYSCTL_DECL 1051SYSCTL_DECL(_net_graph); 1052#endif 1053 1054/* 1055 * Methods that the nodes can use. 1056 * Many of these methods should usually NOT be used directly but via 1057 * Macros above. 1058 */ 1059int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr); 1060int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr); 1061int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr); 1062int ng_bypass(hook_p hook1, hook_p hook2); 1063hook_p ng_findhook(node_p node, const char *name); 1064struct ng_type *ng_findtype(const char *type); 1065int ng_make_node_common(struct ng_type *typep, node_p *nodep); 1066int ng_name_node(node_p node, const char *name); 1067int ng_newtype(struct ng_type *tp); 1068ng_ID_t ng_node2ID(node_p node); 1069item_p ng_package_data(struct mbuf *m, void *dummy); 1070item_p ng_package_msg(struct ng_mesg *msg); 1071item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg); 1072void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr); 1073int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */ 1074int ng_rmnode_self(node_p here); /* if a node wants to suicide */ 1075int ng_rmtype(struct ng_type *tp); 1076int ng_snd_item(item_p item, int queue); 1077int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, 1078 void *arg1, int arg2); 1079int ng_uncallout(struct callout *c, node_p node); 1080int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks, 1081 ng_item_fn *fn, void * arg1, int arg2); 1082#define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE) 1083 1084/* 1085 * prototypes the user should DEFINITELY not use directly 1086 */ 1087void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */ 1088int ng_mod_event(module_t mod, int what, void *arg); 1089 1090/* 1091 * Tag definitions and constants 1092 */ 1093 1094#define NG_TAG_PRIO 1 1095 1096struct ng_tag_prio { 1097 struct m_tag tag; 1098 char priority; 1099 char discardability; 1100}; 1101 1102#define NG_PRIO_CUTOFF 32 1103#define NG_PRIO_LINKSTATE 64 1104 1105/* Macros and declarations to keep compatibility with metadata, which 1106 * is obsoleted now. To be deleted. 1107 */ 1108typedef void *meta_p; 1109#define _NGI_META(i) NULL 1110#define NGI_META(i) NULL 1111#define NG_FREE_META(meta) 1112#define NGI_GET_META(i,m) 1113#define ng_copy_meta(meta) NULL 1114 1115#endif /* _NETGRAPH_NETGRAPH_H_ */ 1116