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sys/netgraph/netgraph.h
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1 /* 2 * netgraph.h 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: releng/6.3/sys/netgraph/netgraph.h 173818 2007-11-21 12:14:00Z glebius $ 41 * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $ 42 */ 43 44 #ifndef _NETGRAPH_NETGRAPH_H_ 45 #define _NETGRAPH_NETGRAPH_H_ 46 47 #ifndef _KERNEL 48 #error "This file should not be included in user level programs" 49 #endif 50 51 #include <sys/queue.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/module.h> 55 #include <sys/mutex.h> 56 57 #include "opt_netgraph.h" 58 59 /* debugging options */ 60 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */ 61 62 /* 63 * This defines the in-kernel binary interface version. 64 * It is possible to change this but leave the external message 65 * API the same. Each type also has it's own cookies for versioning as well. 66 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug 67 * modules. 68 */ 69 #define _NG_ABI_VERSION 11 70 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 71 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000) 72 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 73 #define NG_ABI_VERSION _NG_ABI_VERSION 74 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 75 76 77 /* 78 * Forward references for the basic structures so we can 79 * define the typedefs and use them in the structures themselves. 80 */ 81 struct ng_hook ; 82 struct ng_node ; 83 struct ng_item ; 84 typedef struct ng_item *item_p; 85 typedef struct ng_node *node_p; 86 typedef struct ng_hook *hook_p; 87 88 /* node method definitions */ 89 typedef int ng_constructor_t(node_p node); 90 typedef int ng_close_t(node_p node); 91 typedef int ng_shutdown_t(node_p node); 92 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 93 typedef hook_p ng_findhook_t(node_p node, const char *name); 94 typedef int ng_connect_t(hook_p hook); 95 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook); 96 typedef int ng_rcvdata_t(hook_p hook, item_p item); 97 typedef int ng_disconnect_t(hook_p hook); 98 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item); 99 100 /*********************************************************************** 101 ***************** Hook Structure and Methods ************************** 102 *********************************************************************** 103 * 104 * Structure of a hook 105 */ 106 struct ng_hook { 107 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */ 108 void *hk_private; /* node dependant ID for this hook */ 109 int hk_flags; /* info about this hook/link */ 110 int hk_refs; /* dont actually free this till 0 */ 111 int hk_type; /* tbd: hook data link type */ 112 struct ng_hook *hk_peer; /* the other end of this link */ 113 struct ng_node *hk_node; /* The node this hook is attached to */ 114 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */ 115 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */ 116 ng_rcvdata_t *hk_rcvdata; /* data comes here */ 117 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 118 #define HK_MAGIC 0x78573011 119 int hk_magic; 120 char *lastfile; 121 int lastline; 122 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */ 123 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 124 }; 125 /* Flags for a hook */ 126 #define HK_INVALID 0x0001 /* don't trust it! */ 127 #define HK_QUEUE 0x0002 /* queue for later delivery */ 128 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */ 129 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */ 130 131 /* 132 * Public Methods for hook 133 * If you can't do it with these you probably shouldn;t be doing it. 134 */ 135 void ng_unref_hook(hook_p hook); /* don't move this */ 136 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1) 137 #define _NG_HOOK_NAME(hook) ((hook)->hk_name) 138 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook) 139 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0) 140 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0) 141 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0) 142 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private) 143 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID) 144 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID)) 145 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */ 146 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */ 147 #define _NG_HOOK_FORCE_WRITER(hook) \ 148 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0) 149 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0) 150 151 /* Some shortcuts */ 152 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook)) 153 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook)) 154 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook)) 155 156 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 157 #define _NN_ __FILE__,__LINE__ 158 void dumphook (hook_p hook, char *file, int line); 159 static __inline void _chkhook(hook_p hook, char *file, int line); 160 static __inline void _ng_hook_ref(hook_p hook, char * file, int line); 161 static __inline char * _ng_hook_name(hook_p hook, char * file, int line); 162 static __inline void _ng_hook_unref(hook_p hook, char * file, int line); 163 static __inline void _ng_hook_set_private(hook_p hook, 164 void * val, char * file, int line); 165 static __inline void _ng_hook_set_rcvmsg(hook_p hook, 166 ng_rcvmsg_t *val, char * file, int line); 167 static __inline void _ng_hook_set_rcvdata(hook_p hook, 168 ng_rcvdata_t *val, char * file, int line); 169 static __inline void * _ng_hook_private(hook_p hook, char * file, int line); 170 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line); 171 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line); 172 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line); 173 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line); 174 static __inline void _ng_hook_force_writer(hook_p hook, char * file, 175 int line); 176 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line); 177 178 static __inline void 179 _chkhook(hook_p hook, char *file, int line) 180 { 181 if (hook->hk_magic != HK_MAGIC) { 182 printf("Accessing freed hook "); 183 dumphook(hook, file, line); 184 } 185 hook->lastline = line; 186 hook->lastfile = file; 187 } 188 189 static __inline void 190 _ng_hook_ref(hook_p hook, char * file, int line) 191 { 192 _chkhook(hook, file, line); 193 _NG_HOOK_REF(hook); 194 } 195 196 static __inline char * 197 _ng_hook_name(hook_p hook, char * file, int line) 198 { 199 _chkhook(hook, file, line); 200 return (_NG_HOOK_NAME(hook)); 201 } 202 203 static __inline void 204 _ng_hook_unref(hook_p hook, char * file, int line) 205 { 206 _chkhook(hook, file, line); 207 _NG_HOOK_UNREF(hook); 208 } 209 210 static __inline void 211 _ng_hook_set_private(hook_p hook, void *val, char * file, int line) 212 { 213 _chkhook(hook, file, line); 214 _NG_HOOK_SET_PRIVATE(hook, val); 215 } 216 217 static __inline void 218 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line) 219 { 220 _chkhook(hook, file, line); 221 _NG_HOOK_SET_RCVMSG(hook, val); 222 } 223 224 static __inline void 225 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line) 226 { 227 _chkhook(hook, file, line); 228 _NG_HOOK_SET_RCVDATA(hook, val); 229 } 230 231 static __inline void * 232 _ng_hook_private(hook_p hook, char * file, int line) 233 { 234 _chkhook(hook, file, line); 235 return (_NG_HOOK_PRIVATE(hook)); 236 } 237 238 static __inline int 239 _ng_hook_not_valid(hook_p hook, char * file, int line) 240 { 241 _chkhook(hook, file, line); 242 return (_NG_HOOK_NOT_VALID(hook)); 243 } 244 245 static __inline int 246 _ng_hook_is_valid(hook_p hook, char * file, int line) 247 { 248 _chkhook(hook, file, line); 249 return (_NG_HOOK_IS_VALID(hook)); 250 } 251 252 static __inline node_p 253 _ng_hook_node(hook_p hook, char * file, int line) 254 { 255 _chkhook(hook, file, line); 256 return (_NG_HOOK_NODE(hook)); 257 } 258 259 static __inline hook_p 260 _ng_hook_peer(hook_p hook, char * file, int line) 261 { 262 _chkhook(hook, file, line); 263 return (_NG_HOOK_PEER(hook)); 264 } 265 266 static __inline void 267 _ng_hook_force_writer(hook_p hook, char * file, int line) 268 { 269 _chkhook(hook, file, line); 270 _NG_HOOK_FORCE_WRITER(hook); 271 } 272 273 static __inline void 274 _ng_hook_force_queue(hook_p hook, char * file, int line) 275 { 276 _chkhook(hook, file, line); 277 _NG_HOOK_FORCE_QUEUE(hook); 278 } 279 280 281 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_) 282 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_) 283 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_) 284 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_) 285 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_) 286 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_) 287 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_) 288 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_) 289 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_) 290 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_) 291 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_) 292 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_) 293 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_) 294 295 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 296 297 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook) 298 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook) 299 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook) 300 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val) 301 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val) 302 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val) 303 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook) 304 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook) 305 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook) 306 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook) 307 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook) 308 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook) 309 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook) 310 311 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 312 313 /*********************************************************************** 314 ***************** Node Structure and Methods ************************** 315 *********************************************************************** 316 * Structure of a node 317 * including the eembedded queue structure. 318 * 319 * The structure for queueing Netgraph request items 320 * embedded in the node structure 321 */ 322 struct ng_queue { 323 u_long q_flags; 324 struct mtx q_mtx; 325 item_p queue; 326 item_p *last; 327 struct ng_node *q_node; /* find the front of the node.. */ 328 }; 329 330 struct ng_node { 331 char nd_name[NG_NODESIZ]; /* optional globally unique name */ 332 struct ng_type *nd_type; /* the installed 'type' */ 333 int nd_flags; /* see below for bit definitions */ 334 int nd_refs; /* # of references to this node */ 335 int nd_numhooks; /* number of hooks */ 336 void *nd_private; /* node type dependant node ID */ 337 ng_ID_t nd_ID; /* Unique per node */ 338 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */ 339 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */ 340 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */ 341 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */ 342 struct ng_queue nd_input_queue; /* input queue for locking */ 343 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 344 #define ND_MAGIC 0x59264837 345 int nd_magic; 346 char *lastfile; 347 int lastline; 348 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */ 349 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 350 }; 351 352 /* Flags for a node */ 353 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */ 354 #define NG_INVALID NGF_INVALID /* compat for old code */ 355 #define NGF_WORKQ 0x00000002 /* node is on the work queue */ 356 #define NG_WORKQ NGF_WORKQ /* compat for old code */ 357 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */ 358 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */ 359 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */ 360 #define NG_CLOSING NGF_CLOSING /* compat for old code */ 361 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */ 362 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */ 363 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 364 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 365 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 366 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 367 368 /* 369 * Public methods for nodes. 370 * If you can't do it with these you probably shouldn't be doing it. 371 */ 372 int ng_unref_node(node_p node); /* don't move this */ 373 #define _NG_NODE_NAME(node) ((node)->nd_name + 0) 374 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0) 375 #define _NG_NODE_ID(node) ((node)->nd_ID + 0) 376 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1) 377 #define _NG_NODE_UNREF(node) ng_unref_node(node) 378 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0) 379 #define _NG_NODE_PRIVATE(node) ((node)->nd_private) 380 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID)) 381 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID) 382 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */ 383 #define _NG_NODE_FORCE_WRITER(node) \ 384 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0) 385 #define _NG_NODE_REALLY_DIE(node) \ 386 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0) 387 #define _NG_NODE_REVIVE(node) \ 388 do { node->nd_flags &= ~NGF_INVALID; } while (0) 389 /* 390 * The hook iterator. 391 * This macro will call a function of type ng_fn_eachhook for each 392 * hook attached to the node. If the function returns 0, then the 393 * iterator will stop and return a pointer to the hook that returned 0. 394 */ 395 typedef int ng_fn_eachhook(hook_p hook, void* arg); 396 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 397 do { \ 398 hook_p _hook; \ 399 (rethook) = NULL; \ 400 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \ 401 if ((fn)(_hook, arg) == 0) { \ 402 (rethook) = _hook; \ 403 break; \ 404 } \ 405 } \ 406 } while (0) 407 408 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 409 void dumpnode(node_p node, char *file, int line); 410 static __inline void _chknode(node_p node, char *file, int line); 411 static __inline char * _ng_node_name(node_p node, char *file, int line); 412 static __inline int _ng_node_has_name(node_p node, char *file, int line); 413 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line); 414 static __inline void _ng_node_ref(node_p node, char *file, int line); 415 static __inline int _ng_node_unref(node_p node, char *file, int line); 416 static __inline void _ng_node_set_private(node_p node, void * val, 417 char *file, int line); 418 static __inline void * _ng_node_private(node_p node, char *file, int line); 419 static __inline int _ng_node_is_valid(node_p node, char *file, int line); 420 static __inline int _ng_node_not_valid(node_p node, char *file, int line); 421 static __inline int _ng_node_numhooks(node_p node, char *file, int line); 422 static __inline void _ng_node_force_writer(node_p node, char *file, int line); 423 static __inline hook_p _ng_node_foreach_hook(node_p node, 424 ng_fn_eachhook *fn, void *arg, char *file, int line); 425 static __inline void _ng_node_revive(node_p node, char *file, int line); 426 427 static __inline void 428 _chknode(node_p node, char *file, int line) 429 { 430 if (node->nd_magic != ND_MAGIC) { 431 printf("Accessing freed node "); 432 dumpnode(node, file, line); 433 } 434 node->lastline = line; 435 node->lastfile = file; 436 } 437 438 static __inline char * 439 _ng_node_name(node_p node, char *file, int line) 440 { 441 _chknode(node, file, line); 442 return(_NG_NODE_NAME(node)); 443 } 444 445 static __inline int 446 _ng_node_has_name(node_p node, char *file, int line) 447 { 448 _chknode(node, file, line); 449 return(_NG_NODE_HAS_NAME(node)); 450 } 451 452 static __inline ng_ID_t 453 _ng_node_id(node_p node, char *file, int line) 454 { 455 _chknode(node, file, line); 456 return(_NG_NODE_ID(node)); 457 } 458 459 static __inline void 460 _ng_node_ref(node_p node, char *file, int line) 461 { 462 _chknode(node, file, line); 463 _NG_NODE_REF(node); 464 } 465 466 static __inline int 467 _ng_node_unref(node_p node, char *file, int line) 468 { 469 _chknode(node, file, line); 470 return (_NG_NODE_UNREF(node)); 471 } 472 473 static __inline void 474 _ng_node_set_private(node_p node, void * val, char *file, int line) 475 { 476 _chknode(node, file, line); 477 _NG_NODE_SET_PRIVATE(node, val); 478 } 479 480 static __inline void * 481 _ng_node_private(node_p node, char *file, int line) 482 { 483 _chknode(node, file, line); 484 return (_NG_NODE_PRIVATE(node)); 485 } 486 487 static __inline int 488 _ng_node_is_valid(node_p node, char *file, int line) 489 { 490 _chknode(node, file, line); 491 return(_NG_NODE_IS_VALID(node)); 492 } 493 494 static __inline int 495 _ng_node_not_valid(node_p node, char *file, int line) 496 { 497 _chknode(node, file, line); 498 return(_NG_NODE_NOT_VALID(node)); 499 } 500 501 static __inline int 502 _ng_node_numhooks(node_p node, char *file, int line) 503 { 504 _chknode(node, file, line); 505 return(_NG_NODE_NUMHOOKS(node)); 506 } 507 508 static __inline void 509 _ng_node_force_writer(node_p node, char *file, int line) 510 { 511 _chknode(node, file, line); 512 _NG_NODE_FORCE_WRITER(node); 513 } 514 515 static __inline void 516 _ng_node_really_die(node_p node, char *file, int line) 517 { 518 _chknode(node, file, line); 519 _NG_NODE_REALLY_DIE(node); 520 } 521 522 static __inline void 523 _ng_node_revive(node_p node, char *file, int line) 524 { 525 _chknode(node, file, line); 526 _NG_NODE_REVIVE(node); 527 } 528 529 static __inline hook_p 530 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg, 531 char *file, int line) 532 { 533 hook_p hook; 534 _chknode(node, file, line); 535 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook); 536 return (hook); 537 } 538 539 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_) 540 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_) 541 #define NG_NODE_ID(node) _ng_node_id(node, _NN_) 542 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_) 543 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_) 544 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_) 545 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_) 546 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_) 547 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_) 548 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_) 549 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_) 550 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_) 551 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_) 552 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 553 do { \ 554 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \ 555 } while (0) 556 557 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 558 559 #define NG_NODE_NAME(node) _NG_NODE_NAME(node) 560 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node) 561 #define NG_NODE_ID(node) _NG_NODE_ID(node) 562 #define NG_NODE_REF(node) _NG_NODE_REF(node) 563 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node) 564 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val) 565 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node) 566 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node) 567 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node) 568 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node) 569 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node) 570 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node) 571 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node) 572 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 573 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) 574 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 575 576 /*********************************************************************** 577 ************* Node Queue and Item Structures and Methods ************** 578 *********************************************************************** 579 * 580 */ 581 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2); 582 typedef int ng_item_fn2(node_p node, struct ng_item *item, hook_p hook); 583 typedef void ng_apply_t(void *context, int error); 584 struct ng_apply_info { 585 ng_apply_t *apply; 586 void *context; 587 int refs; 588 }; 589 struct ng_item { 590 u_long el_flags; 591 item_p el_next; 592 node_p el_dest; /* The node it will be applied against (or NULL) */ 593 hook_p el_hook; /* Entering hook. Optional in Control messages */ 594 union { 595 struct mbuf *da_m; 596 struct { 597 struct ng_mesg *msg_msg; 598 ng_ID_t msg_retaddr; 599 } msg; 600 struct { 601 union { 602 ng_item_fn *fn_fn; 603 ng_item_fn2 *fn_fn2; 604 } fn_fn; 605 void *fn_arg1; 606 int fn_arg2; 607 } fn; 608 } body; 609 /* 610 * Optional callback called when item is being applied, 611 * and its context. 612 */ 613 struct ng_apply_info *apply; 614 void *PAD1; 615 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 616 char *lastfile; 617 int lastline; 618 TAILQ_ENTRY(ng_item) all; /* all existing items */ 619 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 620 }; 621 622 #define NGQF_TYPE 0x03 /* MASK of content definition */ 623 #define NGQF_MESG 0x00 /* the queue element is a message */ 624 #define NGQF_DATA 0x01 /* the queue element is data */ 625 #define NGQF_FN 0x02 /* the queue element is a function */ 626 #define NGQF_FN2 0x03 /* the queue element is a new function */ 627 628 #define NGQF_RW 0x04 /* MASK for wanted queue mode */ 629 #define NGQF_READER 0x04 /* wants to be a reader */ 630 #define NGQF_WRITER 0x00 /* wants to be a writer */ 631 632 #define NGQF_QMODE 0x08 /* MASK for how it was queued */ 633 #define NGQF_QREADER 0x08 /* was queued as a reader */ 634 #define NGQF_QWRITER 0x00 /* was queued as a writer */ 635 636 /* 637 * Get the mbuf (etc) out of an item. 638 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM() 639 * with it, (to avoid freeing the things twice). 640 * If you don't want to zero out the item then realise that the 641 * item still owns it. 642 * Retaddr is different. There are no references on that. It's just a number. 643 * The debug versions must be either all used everywhere or not at all. 644 */ 645 646 #define _NGI_M(i) ((i)->body.da_m) 647 #define _NGI_MSG(i) ((i)->body.msg.msg_msg) 648 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr) 649 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn) 650 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2) 651 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1) 652 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2) 653 #define _NGI_NODE(i) ((i)->el_dest) 654 #define _NGI_HOOK(i) ((i)->el_hook) 655 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0) 656 #define _NGI_CLR_HOOK(i) do { \ 657 hook_p _hook = _NGI_HOOK(i); \ 658 if (_hook) { \ 659 _NG_HOOK_UNREF(_hook); \ 660 _NGI_HOOK(i) = NULL; \ 661 } \ 662 } while (0) 663 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0) 664 #define _NGI_CLR_NODE(i) do { \ 665 node_p _node = _NGI_NODE(i); \ 666 if (_node) { \ 667 _NG_NODE_UNREF(_node); \ 668 _NGI_NODE(i) = NULL; \ 669 } \ 670 } while (0) 671 672 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 673 void dumpitem(item_p item, char *file, int line); 674 static __inline void _ngi_check(item_p item, char *file, int line) ; 675 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ; 676 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line); 677 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ; 678 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ; 679 static __inline ng_item_fn2 ** _ngi_fn2(item_p item, char *file, int line) ; 680 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ; 681 static __inline int * _ngi_arg2(item_p item, char *file, int line) ; 682 static __inline node_p _ngi_node(item_p item, char *file, int line); 683 static __inline hook_p _ngi_hook(item_p item, char *file, int line); 684 685 static __inline void 686 _ngi_check(item_p item, char *file, int line) 687 { 688 (item)->lastline = line; 689 (item)->lastfile = file; 690 } 691 692 static __inline struct mbuf ** 693 _ngi_m(item_p item, char *file, int line) 694 { 695 _ngi_check(item, file, line); 696 return (&_NGI_M(item)); 697 } 698 699 static __inline struct ng_mesg ** 700 _ngi_msg(item_p item, char *file, int line) 701 { 702 _ngi_check(item, file, line); 703 return (&_NGI_MSG(item)); 704 } 705 706 static __inline ng_ID_t * 707 _ngi_retaddr(item_p item, char *file, int line) 708 { 709 _ngi_check(item, file, line); 710 return (&_NGI_RETADDR(item)); 711 } 712 713 static __inline ng_item_fn ** 714 _ngi_fn(item_p item, char *file, int line) 715 { 716 _ngi_check(item, file, line); 717 return (&_NGI_FN(item)); 718 } 719 720 static __inline ng_item_fn2 ** 721 _ngi_fn2(item_p item, char *file, int line) 722 { 723 _ngi_check(item, file, line); 724 return (&_NGI_FN2(item)); 725 } 726 727 static __inline void ** 728 _ngi_arg1(item_p item, char *file, int line) 729 { 730 _ngi_check(item, file, line); 731 return (&_NGI_ARG1(item)); 732 } 733 734 static __inline int * 735 _ngi_arg2(item_p item, char *file, int line) 736 { 737 _ngi_check(item, file, line); 738 return (&_NGI_ARG2(item)); 739 } 740 741 static __inline node_p 742 _ngi_node(item_p item, char *file, int line) 743 { 744 _ngi_check(item, file, line); 745 return (_NGI_NODE(item)); 746 } 747 748 static __inline hook_p 749 _ngi_hook(item_p item, char *file, int line) 750 { 751 _ngi_check(item, file, line); 752 return (_NGI_HOOK(item)); 753 } 754 755 #define NGI_M(i) (*_ngi_m(i, _NN_)) 756 #define NGI_MSG(i) (*_ngi_msg(i, _NN_)) 757 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_)) 758 #define NGI_FN(i) (*_ngi_fn(i, _NN_)) 759 #define NGI_FN2(i) (*_ngi_fn2(i, _NN_)) 760 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_)) 761 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_)) 762 #define NGI_HOOK(i) _ngi_hook(i, _NN_) 763 #define NGI_NODE(i) _ngi_node(i, _NN_) 764 #define NGI_SET_HOOK(i,h) \ 765 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0) 766 #define NGI_CLR_HOOK(i) \ 767 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0) 768 #define NGI_SET_NODE(i,n) \ 769 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0) 770 #define NGI_CLR_NODE(i) \ 771 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0) 772 773 #define NG_FREE_ITEM(item) \ 774 do { \ 775 _ngi_check(item, _NN_); \ 776 ng_free_item((item)); \ 777 } while (0) 778 779 #define SAVE_LINE(item) \ 780 do { \ 781 (item)->lastline = __LINE__; \ 782 (item)->lastfile = __FILE__; \ 783 } while (0) 784 785 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 786 787 #define NGI_M(i) _NGI_M(i) 788 #define NGI_MSG(i) _NGI_MSG(i) 789 #define NGI_RETADDR(i) _NGI_RETADDR(i) 790 #define NGI_FN(i) _NGI_FN(i) 791 #define NGI_FN2(i) _NGI_FN2(i) 792 #define NGI_ARG1(i) _NGI_ARG1(i) 793 #define NGI_ARG2(i) _NGI_ARG2(i) 794 #define NGI_NODE(i) _NGI_NODE(i) 795 #define NGI_HOOK(i) _NGI_HOOK(i) 796 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h) 797 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i) 798 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n) 799 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i) 800 801 #define NG_FREE_ITEM(item) ng_free_item((item)) 802 #define SAVE_LINE(item) do {} while (0) 803 804 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 805 806 #define NGI_GET_M(i,m) \ 807 do { \ 808 (m) = NGI_M(i); \ 809 _NGI_M(i) = NULL; \ 810 } while (0) 811 812 #define NGI_GET_MSG(i,m) \ 813 do { \ 814 (m) = NGI_MSG(i); \ 815 _NGI_MSG(i) = NULL; \ 816 } while (0) 817 818 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \ 819 do { \ 820 (n) = NGI_NODE(i); \ 821 _NGI_NODE(i) = NULL; \ 822 } while (0) 823 824 #define NGI_GET_HOOK(i,h) \ 825 do { \ 826 (h) = NGI_HOOK(i); \ 827 _NGI_HOOK(i) = NULL; \ 828 } while (0) 829 830 #define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE) 831 #define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER) 832 833 #define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER) 834 #define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER) 835 836 /********************************************************************** 837 * Data macros. Send, manipulate and free. 838 **********************************************************************/ 839 /* 840 * Assuming the data is already ok, just set the new address and send 841 */ 842 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \ 843 do { \ 844 (error) = \ 845 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \ 846 if (error == 0) { \ 847 SAVE_LINE(item); \ 848 (error) = ng_snd_item((item), (flags)); \ 849 } \ 850 (item) = NULL; \ 851 } while (0) 852 #define NG_FWD_ITEM_HOOK(error, item, hook) \ 853 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS) 854 855 /* 856 * Forward a data packet. Mbuf pointer is updated to new value. We 857 * presume you dealt with the old one when you update it to the new one 858 * (or it maybe the old one). We got a packet and possibly had to modify 859 * the mbuf. You should probably use NGI_GET_M() if you are going to use 860 * this too. 861 */ 862 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \ 863 do { \ 864 NGI_M(item) = (m); \ 865 (m) = NULL; \ 866 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \ 867 } while (0) 868 #define NG_FWD_NEW_DATA(error, item, hook, m) \ 869 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS) 870 871 /* Send a previously unpackaged mbuf. XXX: This should be called 872 * NG_SEND_DATA in future, but this name is kept for compatibility 873 * reasons. 874 */ 875 #define NG_SEND_DATA_FLAGS(error, hook, m, flags) \ 876 do { \ 877 item_p _item; \ 878 if ((_item = ng_package_data((m), flags))) { \ 879 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\ 880 } else { \ 881 (error) = ENOMEM; \ 882 } \ 883 (m) = NULL; \ 884 } while (0) 885 886 #define NG_SEND_DATA_ONLY(error, hook, m) \ 887 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 888 /* NG_SEND_DATA() compat for meta-data times */ 889 #define NG_SEND_DATA(error, hook, m, x) \ 890 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 891 892 #define NG_FREE_MSG(msg) \ 893 do { \ 894 if ((msg)) { \ 895 FREE((msg), M_NETGRAPH_MSG); \ 896 (msg) = NULL; \ 897 } \ 898 } while (0) 899 900 #define NG_FREE_M(m) \ 901 do { \ 902 if ((m)) { \ 903 m_freem((m)); \ 904 (m) = NULL; \ 905 } \ 906 } while (0) 907 908 /***************************************** 909 * Message macros 910 *****************************************/ 911 912 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \ 913 do { \ 914 item_p _item; \ 915 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 916 (msg) = NULL; \ 917 (error) = ENOMEM; \ 918 break; \ 919 } \ 920 if (((error) = ng_address_hook((here), (_item), \ 921 (hook), (retaddr))) == 0) { \ 922 SAVE_LINE(_item); \ 923 (error) = ng_snd_item((_item), 0); \ 924 } \ 925 (msg) = NULL; \ 926 } while (0) 927 928 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \ 929 do { \ 930 item_p _item; \ 931 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 932 (msg) = NULL; \ 933 (error) = ENOMEM; \ 934 break; \ 935 } \ 936 if (((error) = ng_address_path((here), (_item), \ 937 (path), (retaddr))) == 0) { \ 938 SAVE_LINE(_item); \ 939 (error) = ng_snd_item((_item), 0); \ 940 } \ 941 (msg) = NULL; \ 942 } while (0) 943 944 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \ 945 do { \ 946 item_p _item; \ 947 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 948 (msg) = NULL; \ 949 (error) = ENOMEM; \ 950 break; \ 951 } \ 952 if (((error) = ng_address_ID((here), (_item), \ 953 (ID), (retaddr))) == 0) { \ 954 SAVE_LINE(_item); \ 955 (error) = ng_snd_item((_item), 0); \ 956 } \ 957 (msg) = NULL; \ 958 } while (0) 959 960 /* 961 * Redirect the message to the next hop using the given hook. 962 * ng_retarget_msg() frees the item if there is an error 963 * and returns an error code. It returns 0 on success. 964 */ 965 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \ 966 do { \ 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 (item) = NULL; \ 973 } while (0) 974 975 /* 976 * Send a queue item back to it's originator with a response message. 977 * Assume original message was removed and freed separatly. 978 */ 979 #define NG_RESPOND_MSG(error, here, item, resp) \ 980 do { \ 981 if (resp) { \ 982 ng_ID_t _dest = NGI_RETADDR(item); \ 983 NGI_RETADDR(item) = 0; \ 984 NGI_MSG(item) = resp; \ 985 if ((error = ng_address_ID((here), (item), \ 986 _dest, 0)) == 0) { \ 987 SAVE_LINE(item); \ 988 (error) = ng_snd_item((item), NG_QUEUE);\ 989 } \ 990 } else \ 991 NG_FREE_ITEM(item); \ 992 (item) = NULL; \ 993 } while (0) 994 995 996 /*********************************************************************** 997 ******** Structures Definitions and Macros for defining a node ******* 998 *********************************************************************** 999 * 1000 * Here we define the structures needed to actually define a new node 1001 * type. 1002 */ 1003 1004 /* 1005 * Command list -- each node type specifies the command that it knows 1006 * how to convert between ASCII and binary using an array of these. 1007 * The last element in the array must be a terminator with cookie=0. 1008 */ 1009 1010 struct ng_cmdlist { 1011 u_int32_t cookie; /* command typecookie */ 1012 int cmd; /* command number */ 1013 const char *name; /* command name */ 1014 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 1015 const struct ng_parse_type *respType; /* args if NGF_RESP */ 1016 }; 1017 1018 /* 1019 * Structure of a node type 1020 * If data is sent to the "rcvdata()" entrypoint then the system 1021 * may decide to defer it until later by queing it with the normal netgraph 1022 * input queuing system. This is decidde by the HK_QUEUE flag being set in 1023 * the flags word of the peer (receiving) hook. The dequeuing mechanism will 1024 * ensure it is not requeued again. 1025 * Note the input queueing system is to allow modules 1026 * to 'release the stack' or to pass data across spl layers. 1027 * The data will be redelivered as soon as the NETISR code runs 1028 * which may be almost immediatly. A node may also do it's own queueing 1029 * for other reasons (e.g. device output queuing). 1030 */ 1031 struct ng_type { 1032 1033 u_int32_t version; /* must equal NG_API_VERSION */ 1034 const char *name; /* Unique type name */ 1035 modeventhand_t mod_event; /* Module event handler (optional) */ 1036 ng_constructor_t *constructor; /* Node constructor */ 1037 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 1038 ng_close_t *close; /* warn about forthcoming shutdown */ 1039 ng_shutdown_t *shutdown; /* reset, and free resources */ 1040 ng_newhook_t *newhook; /* first notification of new hook */ 1041 ng_findhook_t *findhook; /* only if you have lots of hooks */ 1042 ng_connect_t *connect; /* final notification of new hook */ 1043 ng_rcvdata_t *rcvdata; /* data comes here */ 1044 ng_disconnect_t *disconnect; /* notify on disconnect */ 1045 1046 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 1047 1048 /* R/W data private to the base netgraph code DON'T TOUCH! */ 1049 LIST_ENTRY(ng_type) types; /* linked list of all types */ 1050 int refs; /* number of instances */ 1051 }; 1052 1053 /* 1054 * Use the NETGRAPH_INIT() macro to link a node type into the 1055 * netgraph system. This works for types compiled into the kernel 1056 * as well as KLD modules. The first argument should be the type 1057 * name (eg, echo) and the second a pointer to the type struct. 1058 * 1059 * If a different link time is desired, e.g., a device driver that 1060 * needs to install its netgraph type before probing, use the 1061 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably 1062 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST. 1063 */ 1064 1065 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 1066 static moduledata_t ng_##typename##_mod = { \ 1067 "ng_" #typename, \ 1068 ng_mod_event, \ 1069 (typestructp) \ 1070 }; \ 1071 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \ 1072 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \ 1073 NG_ABI_VERSION, \ 1074 NG_ABI_VERSION) 1075 1076 #define NETGRAPH_INIT(tn, tp) \ 1077 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 1078 1079 /* Special malloc() type for netgraph structs and ctrl messages */ 1080 /* Only these two types should be visible to nodes */ 1081 MALLOC_DECLARE(M_NETGRAPH); 1082 MALLOC_DECLARE(M_NETGRAPH_MSG); 1083 1084 /* declare the base of the netgraph sysclt hierarchy */ 1085 /* but only if this file cares about sysctls */ 1086 #ifdef SYSCTL_DECL 1087 SYSCTL_DECL(_net_graph); 1088 #endif 1089 1090 /* 1091 * Methods that the nodes can use. 1092 * Many of these methods should usually NOT be used directly but via 1093 * Macros above. 1094 */ 1095 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr); 1096 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr); 1097 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr); 1098 int ng_bypass(hook_p hook1, hook_p hook2); 1099 hook_p ng_findhook(node_p node, const char *name); 1100 struct ng_type *ng_findtype(const char *type); 1101 int ng_make_node_common(struct ng_type *typep, node_p *nodep); 1102 int ng_name_node(node_p node, const char *name); 1103 int ng_newtype(struct ng_type *tp); 1104 ng_ID_t ng_node2ID(node_p node); 1105 item_p ng_package_data(struct mbuf *m, int flags); 1106 item_p ng_package_msg(struct ng_mesg *msg, int flags); 1107 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg); 1108 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr); 1109 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */ 1110 int ng_rmnode_self(node_p here); /* if a node wants to suicide */ 1111 int ng_rmtype(struct ng_type *tp); 1112 int ng_snd_item(item_p item, int queue); 1113 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1114 int arg2); 1115 int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1116 int arg2, int flags); 1117 int ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn, 1118 void *arg1, int arg2, int flags); 1119 int ng_uncallout(struct callout *c, node_p node); 1120 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks, 1121 ng_item_fn *fn, void * arg1, int arg2); 1122 #define ng_callout_init(c) callout_init(c, NET_CALLOUT_MPSAFE) 1123 1124 /* Flags for netgraph functions. */ 1125 #define NG_NOFLAGS 0x00000000 /* no special options */ 1126 #define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */ 1127 #define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */ 1128 /* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */ 1129 #define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */ 1130 #define NG_REUSE_ITEM 0x00000008 /* supplied item should be reused */ 1131 1132 /* 1133 * prototypes the user should DEFINITELY not use directly 1134 */ 1135 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */ 1136 int ng_mod_event(module_t mod, int what, void *arg); 1137 1138 /* 1139 * Tag definitions and constants 1140 */ 1141 1142 #define NG_TAG_PRIO 1 1143 1144 struct ng_tag_prio { 1145 struct m_tag tag; 1146 char priority; 1147 char discardability; 1148 }; 1149 1150 #define NG_PRIO_CUTOFF 32 1151 #define NG_PRIO_LINKSTATE 64 1152 1153 /* Macros and declarations to keep compatibility with metadata, which 1154 * is obsoleted now. To be deleted. 1155 */ 1156 typedef void *meta_p; 1157 #define _NGI_META(i) NULL 1158 #define NGI_META(i) NULL 1159 #define NG_FREE_META(meta) 1160 #define NGI_GET_META(i,m) 1161 #define ng_copy_meta(meta) NULL 1162 1163 #endif /* _NETGRAPH_NETGRAPH_H_ */
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