1 /* 2 * netgraph.h 3 * 4 * Copyright (c) 1996-1999 Whistle Communications, Inc. 5 * All rights reserved. 6 * 7 * Subject to the following obligations and disclaimer of warranty, use and 8 * redistribution of this software, in source or object code forms, with or 9 * without modifications are expressly permitted by Whistle Communications; 10 * provided, however, that: 11 * 1. Any and all reproductions of the source or object code must include the 12 * copyright notice above and the following disclaimer of warranties; and 13 * 2. No rights are granted, in any manner or form, to use Whistle 14 * Communications, Inc. trademarks, including the mark "WHISTLE 15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 16 * such appears in the above copyright notice or in the software. 17 * 18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * Author: Julian Elischer <julian@freebsd.org> 37 * 38 * $FreeBSD$ 39 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $ 40 */ 41 42 #ifndef _NETGRAPH_NETGRAPH_H_ 43 #define _NETGRAPH_NETGRAPH_H_ 44 45 #ifndef _KERNEL 46 #error "This file should not be included in user level programs" 47 #endif 48 49 #include <sys/queue.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/module.h> 53 #include <sys/mutex.h> 54 /* debugging options */ 55 #define NETGRAPH_DEBUG 56 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */ 57 58 /* 59 * This defines the in-kernel binary interface version. 60 * It is possible to change this but leave the external message 61 * API the same. Each type also has it's own cookies for versioning as well. 62 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug 63 * modules. 64 */ 65 #define _NG_ABI_VERSION 9 66 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 67 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000) 68 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 69 #define NG_ABI_VERSION _NG_ABI_VERSION 70 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 71 72 73 /* 74 * Forward references for the basic structures so we can 75 * define the typedefs and use them in the structures themselves. 76 */ 77 struct ng_hook ; 78 struct ng_node ; 79 struct ng_item ; 80 typedef struct ng_item *item_p; 81 typedef struct ng_node *node_p; 82 typedef struct ng_hook *hook_p; 83 84 /* node method definitions */ 85 typedef int ng_constructor_t(node_p node); 86 typedef int ng_close_t(node_p node); 87 typedef int ng_shutdown_t(node_p node); 88 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 89 typedef hook_p ng_findhook_t(node_p node, const char *name); 90 typedef int ng_connect_t(hook_p hook); 91 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook); 92 typedef int ng_rcvdata_t(hook_p hook, item_p item); 93 typedef int ng_disconnect_t(hook_p hook); 94 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item); 95 96 /*********************************************************************** 97 ***************** Hook Structure and Methods ************************** 98 *********************************************************************** 99 * 100 * Structure of a hook 101 */ 102 struct ng_hook { 103 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */ 104 void *hk_private; /* node dependant ID for this hook */ 105 int hk_flags; /* info about this hook/link */ 106 int hk_refs; /* dont actually free this till 0 */ 107 struct ng_hook *hk_peer; /* the other end of this link */ 108 struct ng_node *hk_node; /* The node this hook is attached to */ 109 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */ 110 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */ 111 ng_rcvdata_t *hk_rcvdata; /* data comes here */ 112 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 113 #define HK_MAGIC 0x78573011 114 int hk_magic; 115 char *lastfile; 116 int lastline; 117 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */ 118 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 119 }; 120 /* Flags for a hook */ 121 #define HK_INVALID 0x0001 /* don't trust it! */ 122 #define HK_QUEUE 0x0002 /* queue for later delivery */ 123 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */ 124 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */ 125 126 /* 127 * Public Methods for hook 128 * If you can't do it with these you probably shouldn;t be doing it. 129 */ 130 void ng_unref_hook(hook_p hook); /* don't move this */ 131 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1) 132 #define _NG_HOOK_NAME(hook) ((hook)->hk_name) 133 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook) 134 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0) 135 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0) 136 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0) 137 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private) 138 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID) 139 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID)) 140 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */ 141 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */ 142 #define _NG_HOOK_FORCE_WRITER(hook) \ 143 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0) 144 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0) 145 146 /* Some shortcuts */ 147 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook)) 148 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook)) 149 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook)) 150 151 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 152 #define _NN_ __FILE__,__LINE__ 153 void dumphook (hook_p hook, char *file, int line); 154 static __inline void _chkhook(hook_p hook, char *file, int line); 155 static __inline void _ng_hook_ref(hook_p hook, char * file, int line); 156 static __inline char * _ng_hook_name(hook_p hook, char * file, int line); 157 static __inline void _ng_hook_unref(hook_p hook, char * file, int line); 158 static __inline void _ng_hook_set_private(hook_p hook, 159 void * val, char * file, int line); 160 static __inline void _ng_hook_set_rcvmsg(hook_p hook, 161 ng_rcvmsg_t *val, char * file, int line); 162 static __inline void _ng_hook_set_rcvdata(hook_p hook, 163 ng_rcvdata_t *val, char * file, int line); 164 static __inline void * _ng_hook_private(hook_p hook, char * file, int line); 165 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line); 166 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line); 167 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line); 168 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line); 169 static __inline void _ng_hook_force_writer(hook_p hook, char * file, 170 int line); 171 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line); 172 173 static void __inline 174 _chkhook(hook_p hook, char *file, int line) 175 { 176 if (hook->hk_magic != HK_MAGIC) { 177 printf("Accessing freed hook "); 178 dumphook(hook, file, line); 179 } 180 hook->lastline = line; 181 hook->lastfile = file; 182 } 183 184 static __inline void 185 _ng_hook_ref(hook_p hook, char * file, int line) 186 { 187 _chkhook(hook, file, line); 188 _NG_HOOK_REF(hook); 189 } 190 191 static __inline char * 192 _ng_hook_name(hook_p hook, char * file, int line) 193 { 194 _chkhook(hook, file, line); 195 return (_NG_HOOK_NAME(hook)); 196 } 197 198 static __inline void 199 _ng_hook_unref(hook_p hook, char * file, int line) 200 { 201 _chkhook(hook, file, line); 202 _NG_HOOK_UNREF(hook); 203 } 204 205 static __inline void 206 _ng_hook_set_private(hook_p hook, void *val, char * file, int line) 207 { 208 _chkhook(hook, file, line); 209 _NG_HOOK_SET_PRIVATE(hook, val); 210 } 211 212 static __inline void 213 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line) 214 { 215 _chkhook(hook, file, line); 216 _NG_HOOK_SET_RCVMSG(hook, val); 217 } 218 219 static __inline void 220 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line) 221 { 222 _chkhook(hook, file, line); 223 _NG_HOOK_SET_RCVDATA(hook, val); 224 } 225 226 static __inline void * 227 _ng_hook_private(hook_p hook, char * file, int line) 228 { 229 _chkhook(hook, file, line); 230 return (_NG_HOOK_PRIVATE(hook)); 231 } 232 233 static __inline int 234 _ng_hook_not_valid(hook_p hook, char * file, int line) 235 { 236 _chkhook(hook, file, line); 237 return (_NG_HOOK_NOT_VALID(hook)); 238 } 239 240 static __inline int 241 _ng_hook_is_valid(hook_p hook, char * file, int line) 242 { 243 _chkhook(hook, file, line); 244 return (_NG_HOOK_IS_VALID(hook)); 245 } 246 247 static __inline node_p 248 _ng_hook_node(hook_p hook, char * file, int line) 249 { 250 _chkhook(hook, file, line); 251 return (_NG_HOOK_NODE(hook)); 252 } 253 254 static __inline hook_p 255 _ng_hook_peer(hook_p hook, char * file, int line) 256 { 257 _chkhook(hook, file, line); 258 return (_NG_HOOK_PEER(hook)); 259 } 260 261 static __inline void 262 _ng_hook_force_writer(hook_p hook, char * file, int line) 263 { 264 _chkhook(hook, file, line); 265 _NG_HOOK_FORCE_WRITER(hook); 266 } 267 268 static __inline void 269 _ng_hook_force_queue(hook_p hook, char * file, int line) 270 { 271 _chkhook(hook, file, line); 272 _NG_HOOK_FORCE_QUEUE(hook); 273 } 274 275 276 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_) 277 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_) 278 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_) 279 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_) 280 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_) 281 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_) 282 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_) 283 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_) 284 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_) 285 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_) 286 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_) 287 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_) 288 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_) 289 290 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 291 292 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook) 293 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook) 294 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook) 295 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val) 296 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val) 297 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val) 298 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook) 299 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook) 300 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook) 301 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook) 302 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook) 303 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook) 304 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook) 305 306 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 307 308 /*********************************************************************** 309 ***************** Node Structure and Methods ************************** 310 *********************************************************************** 311 * Structure of a node 312 * including the eembedded queue structure. 313 * 314 * The structure for queueing Netgraph request items 315 * embedded in the node structure 316 */ 317 struct ng_queue { 318 u_long q_flags; 319 struct mtx q_mtx; 320 item_p queue; 321 item_p *last; 322 struct ng_node *q_node; /* find the front of the node.. */ 323 }; 324 325 struct ng_node { 326 char nd_name[NG_NODESIZ]; /* optional globally unique name */ 327 struct ng_type *nd_type; /* the installed 'type' */ 328 int nd_flags; /* see below for bit definitions */ 329 int nd_refs; /* # of references to this node */ 330 int nd_numhooks; /* number of hooks */ 331 void *nd_private; /* node type dependant node ID */ 332 ng_ID_t nd_ID; /* Unique per node */ 333 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */ 334 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */ 335 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */ 336 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */ 337 struct ng_queue nd_input_queue; /* input queue for locking */ 338 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 339 #define ND_MAGIC 0x59264837 340 int nd_magic; 341 char *lastfile; 342 int lastline; 343 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */ 344 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 345 }; 346 347 /* Flags for a node */ 348 #define NG_INVALID 0x00000001 /* free when refs go to 0 */ 349 #define NG_WORKQ 0x00000002 /* node is on the work queue */ 350 #define NG_FORCE_WRITER 0x00000004 /* Never multithread this node */ 351 #define NG_CLOSING 0x00000008 /* ng_rmnode() at work */ 352 #define NG_REALLY_DIE 0x00000010 /* "persistant" node is unloading */ 353 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 354 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 355 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 356 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 357 358 /* 359 * Public methods for nodes. 360 * If you can't do it with these you probably shouldn't be doing it. 361 */ 362 int ng_unref_node(node_p node); /* don't move this */ 363 #define _NG_NODE_NAME(node) ((node)->nd_name + 0) 364 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0) 365 #define _NG_NODE_ID(node) ((node)->nd_ID + 0) 366 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1) 367 #define _NG_NODE_UNREF(node) ng_unref_node(node) 368 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0) 369 #define _NG_NODE_PRIVATE(node) ((node)->nd_private) 370 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NG_INVALID)) 371 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NG_INVALID) 372 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */ 373 #define _NG_NODE_FORCE_WRITER(node) \ 374 do{ node->nd_flags |= NG_FORCE_WRITER; }while (0) 375 #define _NG_NODE_REALLY_DIE(node) \ 376 do{ node->nd_flags |= (NG_REALLY_DIE|NG_INVALID); }while (0) 377 /* 378 * The hook iterator. 379 * This macro will call a function of type ng_fn_eachhook for each 380 * hook attached to the node. If the function returns 0, then the 381 * iterator will stop and return a pointer to the hook that returned 0. 382 */ 383 typedef int ng_fn_eachhook(hook_p hook, void* arg); 384 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 385 do { \ 386 hook_p _hook; \ 387 (rethook) = NULL; \ 388 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \ 389 if ((fn)(_hook, arg) == 0) { \ 390 (rethook) = _hook; \ 391 break; \ 392 } \ 393 } \ 394 } while (0) 395 396 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 397 void dumpnode(node_p node, char *file, int line); 398 static void __inline _chknode(node_p node, char *file, int line); 399 static __inline char * _ng_node_name(node_p node, char *file, int line); 400 static __inline int _ng_node_has_name(node_p node, char *file, int line); 401 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line); 402 void ng_ref_node(node_p node); 403 static __inline void _ng_node_ref(node_p node, char *file, int line); 404 static __inline int _ng_node_unref(node_p node, char *file, int line); 405 static __inline void _ng_node_set_private(node_p node, void * val, 406 char *file, int line); 407 static __inline void * _ng_node_private(node_p node, char *file, int line); 408 static __inline int _ng_node_is_valid(node_p node, char *file, int line); 409 static __inline int _ng_node_not_valid(node_p node, char *file, int line); 410 static __inline int _ng_node_numhooks(node_p node, char *file, int line); 411 static __inline void _ng_node_force_writer(node_p node, char *file, int line); 412 static __inline hook_p _ng_node_foreach_hook(node_p node, 413 ng_fn_eachhook *fn, void *arg, char *file, int line); 414 415 static void __inline 416 _chknode(node_p node, char *file, int line) 417 { 418 if (node->nd_magic != ND_MAGIC) { 419 printf("Accessing freed node "); 420 dumpnode(node, file, line); 421 } 422 node->lastline = line; 423 node->lastfile = file; 424 } 425 426 static __inline char * 427 _ng_node_name(node_p node, char *file, int line) 428 { 429 _chknode(node, file, line); 430 return(_NG_NODE_NAME(node)); 431 } 432 433 static __inline int 434 _ng_node_has_name(node_p node, char *file, int line) 435 { 436 _chknode(node, file, line); 437 return(_NG_NODE_HAS_NAME(node)); 438 } 439 440 static __inline ng_ID_t 441 _ng_node_id(node_p node, char *file, int line) 442 { 443 _chknode(node, file, line); 444 return(_NG_NODE_ID(node)); 445 } 446 447 static __inline void 448 _ng_node_ref(node_p node, char *file, int line) 449 { 450 _chknode(node, file, line); 451 /*_NG_NODE_REF(node);*/ 452 ng_ref_node(node); 453 } 454 455 static __inline int 456 _ng_node_unref(node_p node, char *file, int line) 457 { 458 _chknode(node, file, line); 459 return (_NG_NODE_UNREF(node)); 460 } 461 462 static __inline void 463 _ng_node_set_private(node_p node, void * val, char *file, int line) 464 { 465 _chknode(node, file, line); 466 _NG_NODE_SET_PRIVATE(node, val); 467 } 468 469 static __inline void * 470 _ng_node_private(node_p node, char *file, int line) 471 { 472 _chknode(node, file, line); 473 return (_NG_NODE_PRIVATE(node)); 474 } 475 476 static __inline int 477 _ng_node_is_valid(node_p node, char *file, int line) 478 { 479 _chknode(node, file, line); 480 return(_NG_NODE_IS_VALID(node)); 481 } 482 483 static __inline int 484 _ng_node_not_valid(node_p node, char *file, int line) 485 { 486 _chknode(node, file, line); 487 return(_NG_NODE_NOT_VALID(node)); 488 } 489 490 static __inline int 491 _ng_node_numhooks(node_p node, char *file, int line) 492 { 493 _chknode(node, file, line); 494 return(_NG_NODE_NUMHOOKS(node)); 495 } 496 497 static __inline void 498 _ng_node_force_writer(node_p node, char *file, int line) 499 { 500 _chknode(node, file, line); 501 _NG_NODE_FORCE_WRITER(node); 502 } 503 504 static __inline void 505 _ng_node_really_die(node_p node, char *file, int line) 506 { 507 _chknode(node, file, line); 508 _NG_NODE_REALLY_DIE(node); 509 } 510 511 static __inline hook_p 512 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg, 513 char *file, int line) 514 { 515 hook_p hook; 516 _chknode(node, file, line); 517 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook); 518 return (hook); 519 } 520 521 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_) 522 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_) 523 #define NG_NODE_ID(node) _ng_node_id(node, _NN_) 524 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_) 525 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_) 526 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_) 527 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_) 528 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_) 529 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_) 530 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_) 531 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_) 532 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_) 533 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 534 do { \ 535 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \ 536 } while (0) 537 538 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 539 540 #define NG_NODE_NAME(node) _NG_NODE_NAME(node) 541 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node) 542 #define NG_NODE_ID(node) _NG_NODE_ID(node) 543 #define NG_NODE_REF(node) _NG_NODE_REF(node) 544 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node) 545 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val) 546 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node) 547 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node) 548 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node) 549 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node) 550 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node) 551 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node) 552 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 553 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) 554 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 555 556 /*********************************************************************** 557 ************* Node Queue and Item Structures and Methods ************** 558 *********************************************************************** 559 * 560 */ 561 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2); 562 struct ng_item { 563 u_long el_flags; 564 item_p el_next; 565 node_p el_dest; /* The node it will be applied against (or NULL) */ 566 hook_p el_hook; /* Entering hook. Optional in Control messages */ 567 union { 568 struct mbuf *da_m; 569 struct { 570 struct ng_mesg *msg_msg; 571 ng_ID_t msg_retaddr; 572 } msg; 573 struct { 574 ng_item_fn *fn_fn; 575 void *fn_arg1; 576 int fn_arg2; 577 } fn; 578 } body; 579 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 580 char *lastfile; 581 int lastline; 582 TAILQ_ENTRY(ng_item) all; /* all existing items */ 583 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 584 }; 585 586 #define NGQF_TYPE 0x03 /* MASK of content definition */ 587 #define NGQF_MESG 0x00 /* the queue element is a message */ 588 #define NGQF_DATA 0x01 /* the queue element is data */ 589 #define NGQF_FN 0x02 /* the queue element is a function */ 590 #define NGQF_UNDEF 0x03 /* UNDEFINED */ 591 592 #define NGQF_RW 0x04 /* MASK for queue entry read/write */ 593 #define NGQF_READER 0x04 /* queued as a reader */ 594 #define NGQF_WRITER 0x00 /* queued as a writer */ 595 596 #define NGQF_FREE 0x08 597 598 /* 599 * Get the mbuf (etc) out of an item. 600 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM() 601 * with it, (to avoid freeing the things twice). 602 * If you don't want to zero out the item then realise that the 603 * item still owns it. 604 * Retaddr is different. There are no references on that. It's just a number. 605 * The debug versions must be either all used everywhere or not at all. 606 */ 607 608 #define _NGI_M(i) ((i)->body.da_m) 609 #define _NGI_MSG(i) ((i)->body.msg.msg_msg) 610 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr) 611 #define _NGI_FN(i) ((i)->body.fn.fn_fn) 612 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1) 613 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2) 614 #define _NGI_NODE(i) ((i)->el_dest) 615 #define _NGI_HOOK(i) ((i)->el_hook) 616 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0) 617 #define _NGI_CLR_HOOK(i) do { \ 618 hook_p _hook = _NGI_HOOK(i); \ 619 if (_hook) { \ 620 _NG_HOOK_UNREF(_hook); \ 621 _NGI_HOOK(i) = NULL; \ 622 } \ 623 } while (0) 624 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0) 625 #define _NGI_CLR_NODE(i) do { \ 626 node_p _node = _NGI_NODE(i); \ 627 if (_node) { \ 628 _NG_NODE_UNREF(_node); \ 629 _NGI_NODE(i) = NULL; \ 630 } \ 631 } while (0) 632 633 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 634 void dumpitem(item_p item, char *file, int line); 635 static __inline void _ngi_check(item_p item, char *file, int line) ; 636 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ; 637 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line); 638 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ; 639 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ; 640 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ; 641 static __inline int * _ngi_arg2(item_p item, char *file, int line) ; 642 static __inline node_p _ngi_node(item_p item, char *file, int line); 643 static __inline hook_p _ngi_hook(item_p item, char *file, int line); 644 645 static __inline void 646 _ngi_check(item_p item, char *file, int line) 647 { 648 if (item->el_flags & NGQF_FREE) { 649 dumpitem(item, file, line); 650 panic ("free item!"); 651 } 652 (item)->lastline = line; 653 (item)->lastfile = file; 654 } 655 656 static __inline struct mbuf ** 657 _ngi_m(item_p item, char *file, int line) 658 { 659 _ngi_check(item, file, line); 660 return (&_NGI_M(item)); 661 } 662 663 static __inline struct ng_mesg ** 664 _ngi_msg(item_p item, char *file, int line) 665 { 666 _ngi_check(item, file, line); 667 return (&_NGI_MSG(item)); 668 } 669 670 static __inline ng_ID_t * 671 _ngi_retaddr(item_p item, char *file, int line) 672 { 673 _ngi_check(item, file, line); 674 return (&_NGI_RETADDR(item)); 675 } 676 677 static __inline ng_item_fn ** 678 _ngi_fn(item_p item, char *file, int line) 679 { 680 _ngi_check(item, file, line); 681 return (&_NGI_FN(item)); 682 } 683 684 static __inline void ** 685 _ngi_arg1(item_p item, char *file, int line) 686 { 687 _ngi_check(item, file, line); 688 return (&_NGI_ARG1(item)); 689 } 690 691 static __inline int * 692 _ngi_arg2(item_p item, char *file, int line) 693 { 694 _ngi_check(item, file, line); 695 return (&_NGI_ARG2(item)); 696 } 697 698 static __inline node_p 699 _ngi_node(item_p item, char *file, int line) 700 { 701 _ngi_check(item, file, line); 702 return (_NGI_NODE(item)); 703 } 704 705 static __inline hook_p 706 _ngi_hook(item_p item, char *file, int line) 707 { 708 _ngi_check(item, file, line); 709 return (_NGI_HOOK(item)); 710 } 711 712 #define NGI_M(i) (*_ngi_m(i, _NN_)) 713 #define NGI_MSG(i) (*_ngi_msg(i, _NN_)) 714 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_)) 715 #define NGI_FN(i) (*_ngi_fn(i, _NN_)) 716 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_)) 717 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_)) 718 #define NGI_HOOK(i) _ngi_hook(i, _NN_) 719 #define NGI_NODE(i) _ngi_node(i, _NN_) 720 #define NGI_SET_HOOK(i,h) \ 721 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0) 722 #define NGI_CLR_HOOK(i) \ 723 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0) 724 #define NGI_SET_NODE(i,n) \ 725 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0) 726 #define NGI_CLR_NODE(i) \ 727 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0) 728 729 #define NG_FREE_ITEM(item) \ 730 do { \ 731 _ngi_check(item, _NN_); \ 732 ng_free_item((item)); \ 733 } while (0) 734 735 #define SAVE_LINE(item) \ 736 do { \ 737 (item)->lastline = __LINE__; \ 738 (item)->lastfile = __FILE__; \ 739 } while (0) 740 741 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 742 743 #define NGI_M(i) _NGI_M(i) 744 #define NGI_MSG(i) _NGI_MSG(i) 745 #define NGI_RETADDR(i) _NGI_RETADDR(i) 746 #define NGI_FN(i) _NGI_FN(i) 747 #define NGI_ARG1(i) _NGI_ARG1(i) 748 #define NGI_ARG2(i) _NGI_ARG2(i) 749 #define NGI_NODE(i) _NGI_NODE(i) 750 #define NGI_HOOK(i) _NGI_HOOK(i) 751 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h) 752 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i) 753 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n) 754 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i) 755 756 #define NG_FREE_ITEM(item) ng_free_item((item)) 757 #define SAVE_LINE(item) do {} while (0) 758 759 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 760 761 #define NGI_GET_M(i,m) \ 762 do { \ 763 (m) = NGI_M(i); \ 764 _NGI_M(i) = NULL; \ 765 } while (0) 766 767 #define NGI_GET_MSG(i,m) \ 768 do { \ 769 (m) = NGI_MSG(i); \ 770 _NGI_MSG(i) = NULL; \ 771 } while (0) 772 773 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \ 774 do { \ 775 (n) = NGI_NODE(i); \ 776 _NGI_NODE(i) = NULL; \ 777 } while (0) 778 779 #define NGI_GET_HOOK(i,h) \ 780 do { \ 781 (h) = NGI_HOOK(i); \ 782 _NGI_HOOK(i) = NULL; \ 783 } while (0) 784 785 786 /********************************************************************** 787 * Data macros. Send, manipulate and free. 788 **********************************************************************/ 789 /* 790 * Assuming the data is already ok, just set the new address and send 791 */ 792 #define NG_FWD_ITEM_HOOK(error, item, hook) \ 793 do { \ 794 (error) = \ 795 ng_address_hook(NULL, (item), (hook), 0); \ 796 if (error == 0) { \ 797 SAVE_LINE(item); \ 798 (error) = ng_snd_item((item), 0); \ 799 } \ 800 (item) = NULL; \ 801 } while (0) 802 803 /* 804 * Forward a data packet. Mbuf pointer is updated to new value. We 805 * presume you dealt with the old one when you update it to the new one 806 * (or it maybe the old one). We got a packet and possibly had to modify 807 * the mbuf. You should probably use NGI_GET_M() if you are going to use 808 * this too. 809 */ 810 #define NG_FWD_NEW_DATA(error, item, hook, m) \ 811 do { \ 812 NGI_M(item) = (m); \ 813 (m) = NULL; \ 814 NG_FWD_ITEM_HOOK(error, item, hook); \ 815 } while (0) 816 817 /* Send a previously unpackaged mbuf. XXX: This should be called 818 * NG_SEND_DATA in future, but this name is kept for compatibility 819 * reasons. 820 */ 821 #define NG_SEND_DATA_ONLY(error, hook, m) \ 822 do { \ 823 item_p _item; \ 824 if ((_item = ng_package_data((m), NULL))) { \ 825 NG_FWD_ITEM_HOOK(error, _item, hook); \ 826 } else { \ 827 (error) = ENOMEM; \ 828 } \ 829 (m) = NULL; \ 830 } while (0) 831 832 #define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m) 833 834 #define NG_FREE_MSG(msg) \ 835 do { \ 836 if ((msg)) { \ 837 FREE((msg), M_NETGRAPH_MSG); \ 838 (msg) = NULL; \ 839 } \ 840 } while (0) 841 842 #define NG_FREE_M(m) \ 843 do { \ 844 if ((m)) { \ 845 m_freem((m)); \ 846 (m) = NULL; \ 847 } \ 848 } while (0) 849 850 /***************************************** 851 * Message macros 852 *****************************************/ 853 854 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \ 855 do { \ 856 item_p _item; \ 857 if ((_item = ng_package_msg(msg)) == NULL) { \ 858 (msg) = NULL; \ 859 (error) = ENOMEM; \ 860 break; \ 861 } \ 862 if (((error) = ng_address_hook((here), (_item), \ 863 (hook), (retaddr))) == 0) { \ 864 SAVE_LINE(_item); \ 865 (error) = ng_snd_item((_item), 0); \ 866 } \ 867 (msg) = NULL; \ 868 } while (0) 869 870 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \ 871 do { \ 872 item_p _item; \ 873 if ((_item = ng_package_msg(msg)) == NULL) { \ 874 (msg) = NULL; \ 875 (error) = ENOMEM; \ 876 break; \ 877 } \ 878 if (((error) = ng_address_path((here), (_item), \ 879 (path), (retaddr))) == 0) { \ 880 SAVE_LINE(_item); \ 881 (error) = ng_snd_item((_item), 0); \ 882 } \ 883 (msg) = NULL; \ 884 } while (0) 885 886 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \ 887 do { \ 888 item_p _item; \ 889 if ((_item = ng_package_msg(msg)) == NULL) { \ 890 (msg) = NULL; \ 891 (error) = ENOMEM; \ 892 break; \ 893 } \ 894 if (((error) = ng_address_ID((here), (_item), \ 895 (ID), (retaddr))) == 0) { \ 896 SAVE_LINE(_item); \ 897 (error) = ng_snd_item((_item), 0); \ 898 } \ 899 (msg) = NULL; \ 900 } while (0) 901 902 /* 903 * Redirect the message to the next hop using the given hook. 904 * ng_retarget_msg() frees the item if there is an error 905 * and returns an error code. It returns 0 on success. 906 */ 907 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \ 908 do { \ 909 if (((error) = ng_address_hook((here), (item), \ 910 (hook), (retaddr))) == 0) { \ 911 SAVE_LINE(item); \ 912 (error) = ng_snd_item((item), 0); \ 913 } \ 914 (item) = NULL; \ 915 } while (0) 916 917 /* 918 * Send a queue item back to it's originator with a response message. 919 * Assume original message was removed and freed separatly. 920 */ 921 #define NG_RESPOND_MSG(error, here, item, resp) \ 922 do { \ 923 if (resp) { \ 924 ng_ID_t _dest = NGI_RETADDR(item); \ 925 NGI_RETADDR(item) = 0; \ 926 NGI_MSG(item) = resp; \ 927 if ((ng_address_ID((here), (item), \ 928 _dest, 0)) == 0) { \ 929 SAVE_LINE(item); \ 930 (error) = ng_snd_item((item), 1); \ 931 } else { \ 932 (error) = EINVAL; \ 933 } \ 934 } else { \ 935 NG_FREE_ITEM(item); \ 936 } \ 937 (item) = NULL; \ 938 } while (0) 939 940 941 /*********************************************************************** 942 ******** Structures Definitions and Macros for defining a node ******* 943 *********************************************************************** 944 * 945 * Here we define the structures needed to actually define a new node 946 * type. 947 */ 948 949 /* 950 * Command list -- each node type specifies the command that it knows 951 * how to convert between ASCII and binary using an array of these. 952 * The last element in the array must be a terminator with cookie=0. 953 */ 954 955 struct ng_cmdlist { 956 u_int32_t cookie; /* command typecookie */ 957 int cmd; /* command number */ 958 const char *name; /* command name */ 959 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 960 const struct ng_parse_type *respType; /* args if NGF_RESP */ 961 }; 962 963 /* 964 * Structure of a node type 965 * If data is sent to the "rcvdata()" entrypoint then the system 966 * may decide to defer it until later by queing it with the normal netgraph 967 * input queuing system. This is decidde by the HK_QUEUE flag being set in 968 * the flags word of the peer (receiving) hook. The dequeuing mechanism will 969 * ensure it is not requeued again. 970 * Note the input queueing system is to allow modules 971 * to 'release the stack' or to pass data across spl layers. 972 * The data will be redelivered as soon as the NETISR code runs 973 * which may be almost immediatly. A node may also do it's own queueing 974 * for other reasons (e.g. device output queuing). 975 */ 976 struct ng_type { 977 978 u_int32_t version; /* must equal NG_API_VERSION */ 979 const char *name; /* Unique type name */ 980 modeventhand_t mod_event; /* Module event handler (optional) */ 981 ng_constructor_t *constructor; /* Node constructor */ 982 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 983 ng_close_t *close; /* warn about forthcoming shutdown */ 984 ng_shutdown_t *shutdown; /* reset, and free resources */ 985 ng_newhook_t *newhook; /* first notification of new hook */ 986 ng_findhook_t *findhook; /* only if you have lots of hooks */ 987 ng_connect_t *connect; /* final notification of new hook */ 988 ng_rcvdata_t *rcvdata; /* data comes here */ 989 ng_disconnect_t *disconnect; /* notify on disconnect */ 990 991 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 992 993 /* R/W data private to the base netgraph code DON'T TOUCH! */ 994 LIST_ENTRY(ng_type) types; /* linked list of all types */ 995 int refs; /* number of instances */ 996 }; 997 998 /* 999 * Use the NETGRAPH_INIT() macro to link a node type into the 1000 * netgraph system. This works for types compiled into the kernel 1001 * as well as KLD modules. The first argument should be the type 1002 * name (eg, echo) and the second a pointer to the type struct. 1003 * 1004 * If a different link time is desired, e.g., a device driver that 1005 * needs to install its netgraph type before probing, use the 1006 * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably 1007 * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO. 1008 */ 1009 1010 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 1011 static moduledata_t ng_##typename##_mod = { \ 1012 "ng_" #typename, \ 1013 ng_mod_event, \ 1014 (typestructp) \ 1015 }; \ 1016 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \ 1017 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \ 1018 NG_ABI_VERSION, \ 1019 NG_ABI_VERSION) 1020 1021 #define NETGRAPH_INIT(tn, tp) \ 1022 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 1023 1024 /* Special malloc() type for netgraph structs and ctrl messages */ 1025 /* Only these two types should be visible to nodes */ 1026 MALLOC_DECLARE(M_NETGRAPH); 1027 MALLOC_DECLARE(M_NETGRAPH_MSG); 1028 1029 /* declare the base of the netgraph sysclt hierarchy */ 1030 /* but only if this file cares about sysctls */ 1031 #ifdef SYSCTL_DECL 1032 SYSCTL_DECL(_net_graph); 1033 #endif 1034 1035 /* 1036 * Methods that the nodes can use. 1037 * Many of these methods should usually NOT be used directly but via 1038 * Macros above. 1039 */ 1040 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr); 1041 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr); 1042 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr); 1043 int ng_bypass(hook_p hook1, hook_p hook2); 1044 hook_p ng_findhook(node_p node, const char *name); 1045 int ng_make_node_common(struct ng_type *typep, node_p *nodep); 1046 int ng_name_node(node_p node, const char *name); 1047 int ng_newtype(struct ng_type *tp); 1048 ng_ID_t ng_node2ID(node_p node); 1049 item_p ng_package_data(struct mbuf *m, void *dummy); 1050 item_p ng_package_msg(struct ng_mesg *msg); 1051 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg); 1052 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr); 1053 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */ 1054 int ng_rmnode_self(node_p here); /* if a node wants to suicide */ 1055 int ng_rmtype(struct ng_type *tp); 1056 int ng_snd_item(item_p item, int queue); 1057 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, 1058 void *arg1, int arg2); 1059 int ng_untimeout(struct callout_handle handle, node_p node); 1060 struct callout_handle 1061 ng_timeout(node_p node, hook_p hook, int ticks, 1062 ng_item_fn *fn, void * arg1, int arg2); 1063 1064 /* 1065 * prototypes the user should DEFINITELY not use directly 1066 */ 1067 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */ 1068 int ng_mod_event(module_t mod, int what, void *arg); 1069 1070 /* 1071 * Tag definitions and constants 1072 */ 1073 1074 #define NG_TAG_PRIO 1 1075 1076 struct ng_tag_prio { 1077 struct m_tag tag; 1078 char priority; 1079 char discardability; 1080 }; 1081 1082 #define NG_PRIO_CUTOFF 32 1083 #define NG_PRIO_LINKSTATE 64 1084 1085 /* Macros and declarations to keep compatibility with metadata, which 1086 * is obsoleted now. To be deleted. 1087 */ 1088 typedef void *meta_p; 1089 #define _NGI_META(i) NULL 1090 #define NGI_META(i) NULL 1091 #define NG_FREE_META(meta) 1092 #define NGI_GET_META(i,m) 1093 #define ng_copy_meta(meta) NULL 1094 1095 #endif /* _NETGRAPH_NETGRAPH_H_ */ 1096