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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/7.4/sys/netgraph/netgraph.h 194270 2009-06-15 22:07:21Z gnn $ 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 #ifdef HAVE_KERNEL_OPTION_HEADERS 58 #include "opt_netgraph.h" 59 #endif 60 61 /* debugging options */ 62 #define NG_SEPARATE_MALLOC /* make modules use their own malloc types */ 63 64 /* 65 * This defines the in-kernel binary interface version. 66 * It is possible to change this but leave the external message 67 * API the same. Each type also has it's own cookies for versioning as well. 68 * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug 69 * modules. 70 */ 71 #define _NG_ABI_VERSION 11 72 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 73 #define NG_ABI_VERSION (_NG_ABI_VERSION + 0x10000) 74 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 75 #define NG_ABI_VERSION _NG_ABI_VERSION 76 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 77 78 79 /* 80 * Forward references for the basic structures so we can 81 * define the typedefs and use them in the structures themselves. 82 */ 83 struct ng_hook ; 84 struct ng_node ; 85 struct ng_item ; 86 typedef struct ng_item *item_p; 87 typedef struct ng_node *node_p; 88 typedef struct ng_hook *hook_p; 89 90 /* node method definitions */ 91 typedef int ng_constructor_t(node_p node); 92 typedef int ng_close_t(node_p node); 93 typedef int ng_shutdown_t(node_p node); 94 typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 95 typedef hook_p ng_findhook_t(node_p node, const char *name); 96 typedef int ng_connect_t(hook_p hook); 97 typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook); 98 typedef int ng_rcvdata_t(hook_p hook, item_p item); 99 typedef int ng_disconnect_t(hook_p hook); 100 typedef int ng_rcvitem (node_p node, hook_p hook, item_p item); 101 102 /*********************************************************************** 103 ***************** Hook Structure and Methods ************************** 104 *********************************************************************** 105 * 106 * Structure of a hook 107 */ 108 struct ng_hook { 109 char hk_name[NG_HOOKSIZ]; /* what this node knows this link as */ 110 void *hk_private; /* node dependant ID for this hook */ 111 int hk_flags; /* info about this hook/link */ 112 int hk_refs; /* dont actually free this till 0 */ 113 int hk_type; /* tbd: hook data link type */ 114 struct ng_hook *hk_peer; /* the other end of this link */ 115 struct ng_node *hk_node; /* The node this hook is attached to */ 116 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */ 117 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */ 118 ng_rcvdata_t *hk_rcvdata; /* data comes here */ 119 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 120 #define HK_MAGIC 0x78573011 121 int hk_magic; 122 char *lastfile; 123 int lastline; 124 SLIST_ENTRY(ng_hook) hk_all; /* all existing items */ 125 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 126 }; 127 /* Flags for a hook */ 128 #define HK_INVALID 0x0001 /* don't trust it! */ 129 #define HK_QUEUE 0x0002 /* queue for later delivery */ 130 #define HK_FORCE_WRITER 0x0004 /* Incoming data queued as a writer */ 131 #define HK_DEAD 0x0008 /* This is the dead hook.. don't free */ 132 #define HK_HI_STACK 0x0010 /* Hook has hi stack usage */ 133 134 /* 135 * Public Methods for hook 136 * If you can't do it with these you probably shouldn;t be doing it. 137 */ 138 void ng_unref_hook(hook_p hook); /* don't move this */ 139 #define _NG_HOOK_REF(hook) atomic_add_int(&(hook)->hk_refs, 1) 140 #define _NG_HOOK_NAME(hook) ((hook)->hk_name) 141 #define _NG_HOOK_UNREF(hook) ng_unref_hook(hook) 142 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0) 143 #define _NG_HOOK_SET_RCVMSG(hook, val) do {(hook)->hk_rcvmsg = val;} while (0) 144 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0) 145 #define _NG_HOOK_PRIVATE(hook) ((hook)->hk_private) 146 #define _NG_HOOK_NOT_VALID(hook) ((hook)->hk_flags & HK_INVALID) 147 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID)) 148 #define _NG_HOOK_NODE(hook) ((hook)->hk_node) /* only rvalue! */ 149 #define _NG_HOOK_PEER(hook) ((hook)->hk_peer) /* only rvalue! */ 150 #define _NG_HOOK_FORCE_WRITER(hook) \ 151 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0) 152 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0) 153 #define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0) 154 155 /* Some shortcuts */ 156 #define NG_PEER_NODE(hook) NG_HOOK_NODE(NG_HOOK_PEER(hook)) 157 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook)) 158 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook)) 159 160 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 161 #define _NN_ __FILE__,__LINE__ 162 void dumphook (hook_p hook, char *file, int line); 163 static __inline void _chkhook(hook_p hook, char *file, int line); 164 static __inline void _ng_hook_ref(hook_p hook, char * file, int line); 165 static __inline char * _ng_hook_name(hook_p hook, char * file, int line); 166 static __inline void _ng_hook_unref(hook_p hook, char * file, int line); 167 static __inline void _ng_hook_set_private(hook_p hook, 168 void * val, char * file, int line); 169 static __inline void _ng_hook_set_rcvmsg(hook_p hook, 170 ng_rcvmsg_t *val, char * file, int line); 171 static __inline void _ng_hook_set_rcvdata(hook_p hook, 172 ng_rcvdata_t *val, char * file, int line); 173 static __inline void * _ng_hook_private(hook_p hook, char * file, int line); 174 static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line); 175 static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line); 176 static __inline node_p _ng_hook_node(hook_p hook, char * file, int line); 177 static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line); 178 static __inline void _ng_hook_force_writer(hook_p hook, char * file, 179 int line); 180 static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line); 181 182 static __inline void 183 _chkhook(hook_p hook, char *file, int line) 184 { 185 if (hook->hk_magic != HK_MAGIC) { 186 printf("Accessing freed hook "); 187 dumphook(hook, file, line); 188 } 189 hook->lastline = line; 190 hook->lastfile = file; 191 } 192 193 static __inline void 194 _ng_hook_ref(hook_p hook, char * file, int line) 195 { 196 _chkhook(hook, file, line); 197 _NG_HOOK_REF(hook); 198 } 199 200 static __inline char * 201 _ng_hook_name(hook_p hook, char * file, int line) 202 { 203 _chkhook(hook, file, line); 204 return (_NG_HOOK_NAME(hook)); 205 } 206 207 static __inline void 208 _ng_hook_unref(hook_p hook, char * file, int line) 209 { 210 _chkhook(hook, file, line); 211 _NG_HOOK_UNREF(hook); 212 } 213 214 static __inline void 215 _ng_hook_set_private(hook_p hook, void *val, char * file, int line) 216 { 217 _chkhook(hook, file, line); 218 _NG_HOOK_SET_PRIVATE(hook, val); 219 } 220 221 static __inline void 222 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line) 223 { 224 _chkhook(hook, file, line); 225 _NG_HOOK_SET_RCVMSG(hook, val); 226 } 227 228 static __inline void 229 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line) 230 { 231 _chkhook(hook, file, line); 232 _NG_HOOK_SET_RCVDATA(hook, val); 233 } 234 235 static __inline void * 236 _ng_hook_private(hook_p hook, char * file, int line) 237 { 238 _chkhook(hook, file, line); 239 return (_NG_HOOK_PRIVATE(hook)); 240 } 241 242 static __inline int 243 _ng_hook_not_valid(hook_p hook, char * file, int line) 244 { 245 _chkhook(hook, file, line); 246 return (_NG_HOOK_NOT_VALID(hook)); 247 } 248 249 static __inline int 250 _ng_hook_is_valid(hook_p hook, char * file, int line) 251 { 252 _chkhook(hook, file, line); 253 return (_NG_HOOK_IS_VALID(hook)); 254 } 255 256 static __inline node_p 257 _ng_hook_node(hook_p hook, char * file, int line) 258 { 259 _chkhook(hook, file, line); 260 return (_NG_HOOK_NODE(hook)); 261 } 262 263 static __inline hook_p 264 _ng_hook_peer(hook_p hook, char * file, int line) 265 { 266 _chkhook(hook, file, line); 267 return (_NG_HOOK_PEER(hook)); 268 } 269 270 static __inline void 271 _ng_hook_force_writer(hook_p hook, char * file, int line) 272 { 273 _chkhook(hook, file, line); 274 _NG_HOOK_FORCE_WRITER(hook); 275 } 276 277 static __inline void 278 _ng_hook_force_queue(hook_p hook, char * file, int line) 279 { 280 _chkhook(hook, file, line); 281 _NG_HOOK_FORCE_QUEUE(hook); 282 } 283 284 static __inline void 285 _ng_hook_hi_stack(hook_p hook, char * file, int line) 286 { 287 _chkhook(hook, file, line); 288 _NG_HOOK_HI_STACK(hook); 289 } 290 291 292 #define NG_HOOK_REF(hook) _ng_hook_ref(hook, _NN_) 293 #define NG_HOOK_NAME(hook) _ng_hook_name(hook, _NN_) 294 #define NG_HOOK_UNREF(hook) _ng_hook_unref(hook, _NN_) 295 #define NG_HOOK_SET_PRIVATE(hook, val) _ng_hook_set_private(hook, val, _NN_) 296 #define NG_HOOK_SET_RCVMSG(hook, val) _ng_hook_set_rcvmsg(hook, val, _NN_) 297 #define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_) 298 #define NG_HOOK_PRIVATE(hook) _ng_hook_private(hook, _NN_) 299 #define NG_HOOK_NOT_VALID(hook) _ng_hook_not_valid(hook, _NN_) 300 #define NG_HOOK_IS_VALID(hook) _ng_hook_is_valid(hook, _NN_) 301 #define NG_HOOK_NODE(hook) _ng_hook_node(hook, _NN_) 302 #define NG_HOOK_PEER(hook) _ng_hook_peer(hook, _NN_) 303 #define NG_HOOK_FORCE_WRITER(hook) _ng_hook_force_writer(hook, _NN_) 304 #define NG_HOOK_FORCE_QUEUE(hook) _ng_hook_force_queue(hook, _NN_) 305 #define NG_HOOK_HI_STACK(hook) _ng_hook_hi_stack(hook, _NN_) 306 307 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 308 309 #define NG_HOOK_REF(hook) _NG_HOOK_REF(hook) 310 #define NG_HOOK_NAME(hook) _NG_HOOK_NAME(hook) 311 #define NG_HOOK_UNREF(hook) _NG_HOOK_UNREF(hook) 312 #define NG_HOOK_SET_PRIVATE(hook, val) _NG_HOOK_SET_PRIVATE(hook, val) 313 #define NG_HOOK_SET_RCVMSG(hook, val) _NG_HOOK_SET_RCVMSG(hook, val) 314 #define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val) 315 #define NG_HOOK_PRIVATE(hook) _NG_HOOK_PRIVATE(hook) 316 #define NG_HOOK_NOT_VALID(hook) _NG_HOOK_NOT_VALID(hook) 317 #define NG_HOOK_IS_VALID(hook) _NG_HOOK_IS_VALID(hook) 318 #define NG_HOOK_NODE(hook) _NG_HOOK_NODE(hook) 319 #define NG_HOOK_PEER(hook) _NG_HOOK_PEER(hook) 320 #define NG_HOOK_FORCE_WRITER(hook) _NG_HOOK_FORCE_WRITER(hook) 321 #define NG_HOOK_FORCE_QUEUE(hook) _NG_HOOK_FORCE_QUEUE(hook) 322 #define NG_HOOK_HI_STACK(hook) _NG_HOOK_HI_STACK(hook) 323 324 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 325 326 /*********************************************************************** 327 ***************** Node Structure and Methods ************************** 328 *********************************************************************** 329 * Structure of a node 330 * including the eembedded queue structure. 331 * 332 * The structure for queueing Netgraph request items 333 * embedded in the node structure 334 */ 335 struct ng_queue { 336 u_long q_flags; 337 struct mtx q_mtx; 338 item_p queue; 339 item_p *last; 340 struct ng_node *q_node; /* find the front of the node.. */ 341 }; 342 343 struct ng_node { 344 char nd_name[NG_NODESIZ]; /* optional globally unique name */ 345 struct ng_type *nd_type; /* the installed 'type' */ 346 int nd_flags; /* see below for bit definitions */ 347 int nd_refs; /* # of references to this node */ 348 int nd_numhooks; /* number of hooks */ 349 void *nd_private; /* node type dependant node ID */ 350 ng_ID_t nd_ID; /* Unique per node */ 351 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */ 352 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */ 353 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */ 354 TAILQ_ENTRY(ng_node) nd_work; /* nodes with work to do */ 355 struct ng_queue nd_input_queue; /* input queue for locking */ 356 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 357 #define ND_MAGIC 0x59264837 358 int nd_magic; 359 char *lastfile; 360 int lastline; 361 SLIST_ENTRY(ng_node) nd_all; /* all existing nodes */ 362 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 363 }; 364 365 /* Flags for a node */ 366 #define NGF_INVALID 0x00000001 /* free when refs go to 0 */ 367 #define NG_INVALID NGF_INVALID /* compat for old code */ 368 #define NGF_WORKQ 0x00000002 /* node is on the work queue */ 369 #define NG_WORKQ NGF_WORKQ /* compat for old code */ 370 #define NGF_FORCE_WRITER 0x00000004 /* Never multithread this node */ 371 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */ 372 #define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */ 373 #define NG_CLOSING NGF_CLOSING /* compat for old code */ 374 #define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */ 375 #define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */ 376 #define NGF_HI_STACK 0x00000020 /* node has hi stack usage */ 377 #define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 378 #define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 379 #define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 380 #define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 381 382 /* 383 * Public methods for nodes. 384 * If you can't do it with these you probably shouldn't be doing it. 385 */ 386 int ng_unref_node(node_p node); /* don't move this */ 387 #define _NG_NODE_NAME(node) ((node)->nd_name + 0) 388 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0) 389 #define _NG_NODE_ID(node) ((node)->nd_ID + 0) 390 #define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1) 391 #define _NG_NODE_UNREF(node) ng_unref_node(node) 392 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0) 393 #define _NG_NODE_PRIVATE(node) ((node)->nd_private) 394 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID)) 395 #define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID) 396 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */ 397 #define _NG_NODE_FORCE_WRITER(node) \ 398 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0) 399 #define _NG_NODE_HI_STACK(node) \ 400 do{ node->nd_flags |= NGF_HI_STACK; }while (0) 401 #define _NG_NODE_REALLY_DIE(node) \ 402 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0) 403 #define _NG_NODE_REVIVE(node) \ 404 do { node->nd_flags &= ~NGF_INVALID; } while (0) 405 /* 406 * The hook iterator. 407 * This macro will call a function of type ng_fn_eachhook for each 408 * hook attached to the node. If the function returns 0, then the 409 * iterator will stop and return a pointer to the hook that returned 0. 410 */ 411 typedef int ng_fn_eachhook(hook_p hook, void* arg); 412 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 413 do { \ 414 hook_p _hook; \ 415 (rethook) = NULL; \ 416 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \ 417 if ((fn)(_hook, arg) == 0) { \ 418 (rethook) = _hook; \ 419 break; \ 420 } \ 421 } \ 422 } while (0) 423 424 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 425 void dumpnode(node_p node, char *file, int line); 426 static __inline void _chknode(node_p node, char *file, int line); 427 static __inline char * _ng_node_name(node_p node, char *file, int line); 428 static __inline int _ng_node_has_name(node_p node, char *file, int line); 429 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line); 430 static __inline void _ng_node_ref(node_p node, char *file, int line); 431 static __inline int _ng_node_unref(node_p node, char *file, int line); 432 static __inline void _ng_node_set_private(node_p node, void * val, 433 char *file, int line); 434 static __inline void * _ng_node_private(node_p node, char *file, int line); 435 static __inline int _ng_node_is_valid(node_p node, char *file, int line); 436 static __inline int _ng_node_not_valid(node_p node, char *file, int line); 437 static __inline int _ng_node_numhooks(node_p node, char *file, int line); 438 static __inline void _ng_node_force_writer(node_p node, char *file, int line); 439 static __inline hook_p _ng_node_foreach_hook(node_p node, 440 ng_fn_eachhook *fn, void *arg, char *file, int line); 441 static __inline void _ng_node_revive(node_p node, char *file, int line); 442 443 static __inline void 444 _chknode(node_p node, char *file, int line) 445 { 446 if (node->nd_magic != ND_MAGIC) { 447 printf("Accessing freed node "); 448 dumpnode(node, file, line); 449 } 450 node->lastline = line; 451 node->lastfile = file; 452 } 453 454 static __inline char * 455 _ng_node_name(node_p node, char *file, int line) 456 { 457 _chknode(node, file, line); 458 return(_NG_NODE_NAME(node)); 459 } 460 461 static __inline int 462 _ng_node_has_name(node_p node, char *file, int line) 463 { 464 _chknode(node, file, line); 465 return(_NG_NODE_HAS_NAME(node)); 466 } 467 468 static __inline ng_ID_t 469 _ng_node_id(node_p node, char *file, int line) 470 { 471 _chknode(node, file, line); 472 return(_NG_NODE_ID(node)); 473 } 474 475 static __inline void 476 _ng_node_ref(node_p node, char *file, int line) 477 { 478 _chknode(node, file, line); 479 _NG_NODE_REF(node); 480 } 481 482 static __inline int 483 _ng_node_unref(node_p node, char *file, int line) 484 { 485 _chknode(node, file, line); 486 return (_NG_NODE_UNREF(node)); 487 } 488 489 static __inline void 490 _ng_node_set_private(node_p node, void * val, char *file, int line) 491 { 492 _chknode(node, file, line); 493 _NG_NODE_SET_PRIVATE(node, val); 494 } 495 496 static __inline void * 497 _ng_node_private(node_p node, char *file, int line) 498 { 499 _chknode(node, file, line); 500 return (_NG_NODE_PRIVATE(node)); 501 } 502 503 static __inline int 504 _ng_node_is_valid(node_p node, char *file, int line) 505 { 506 _chknode(node, file, line); 507 return(_NG_NODE_IS_VALID(node)); 508 } 509 510 static __inline int 511 _ng_node_not_valid(node_p node, char *file, int line) 512 { 513 _chknode(node, file, line); 514 return(_NG_NODE_NOT_VALID(node)); 515 } 516 517 static __inline int 518 _ng_node_numhooks(node_p node, char *file, int line) 519 { 520 _chknode(node, file, line); 521 return(_NG_NODE_NUMHOOKS(node)); 522 } 523 524 static __inline void 525 _ng_node_force_writer(node_p node, char *file, int line) 526 { 527 _chknode(node, file, line); 528 _NG_NODE_FORCE_WRITER(node); 529 } 530 531 static __inline void 532 _ng_node_hi_stack(node_p node, char *file, int line) 533 { 534 _chknode(node, file, line); 535 _NG_NODE_HI_STACK(node); 536 } 537 538 static __inline void 539 _ng_node_really_die(node_p node, char *file, int line) 540 { 541 _chknode(node, file, line); 542 _NG_NODE_REALLY_DIE(node); 543 } 544 545 static __inline void 546 _ng_node_revive(node_p node, char *file, int line) 547 { 548 _chknode(node, file, line); 549 _NG_NODE_REVIVE(node); 550 } 551 552 static __inline hook_p 553 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg, 554 char *file, int line) 555 { 556 hook_p hook; 557 _chknode(node, file, line); 558 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook); 559 return (hook); 560 } 561 562 #define NG_NODE_NAME(node) _ng_node_name(node, _NN_) 563 #define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_) 564 #define NG_NODE_ID(node) _ng_node_id(node, _NN_) 565 #define NG_NODE_REF(node) _ng_node_ref(node, _NN_) 566 #define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_) 567 #define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_) 568 #define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_) 569 #define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_) 570 #define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_) 571 #define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_) 572 #define NG_NODE_HI_STACK(node) _ng_node_hi_stack(node, _NN_) 573 #define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_) 574 #define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_) 575 #define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_) 576 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 577 do { \ 578 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \ 579 } while (0) 580 581 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 582 583 #define NG_NODE_NAME(node) _NG_NODE_NAME(node) 584 #define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node) 585 #define NG_NODE_ID(node) _NG_NODE_ID(node) 586 #define NG_NODE_REF(node) _NG_NODE_REF(node) 587 #define NG_NODE_UNREF(node) _NG_NODE_UNREF(node) 588 #define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val) 589 #define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node) 590 #define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node) 591 #define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node) 592 #define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node) 593 #define NG_NODE_HI_STACK(node) _NG_NODE_HI_STACK(node) 594 #define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node) 595 #define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node) 596 #define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node) 597 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 598 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) 599 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 600 601 /*********************************************************************** 602 ************* Node Queue and Item Structures and Methods ************** 603 *********************************************************************** 604 * 605 */ 606 typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2); 607 typedef int ng_item_fn2(node_p node, struct ng_item *item, hook_p hook); 608 typedef void ng_apply_t(void *context, int error); 609 struct ng_apply_info { 610 ng_apply_t *apply; 611 void *context; 612 int refs; 613 int error; 614 }; 615 struct ng_item { 616 u_long el_flags; 617 item_p el_next; 618 node_p el_dest; /* The node it will be applied against (or NULL) */ 619 hook_p el_hook; /* Entering hook. Optional in Control messages */ 620 union { 621 struct mbuf *da_m; 622 struct { 623 struct ng_mesg *msg_msg; 624 ng_ID_t msg_retaddr; 625 } msg; 626 struct { 627 union { 628 ng_item_fn *fn_fn; 629 ng_item_fn2 *fn_fn2; 630 } fn_fn; 631 void *fn_arg1; 632 int fn_arg2; 633 } fn; 634 } body; 635 /* 636 * Optional callback called when item is being applied, 637 * and its context. 638 */ 639 struct ng_apply_info *apply; 640 uintptr_t depth; 641 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 642 char *lastfile; 643 int lastline; 644 TAILQ_ENTRY(ng_item) all; /* all existing items */ 645 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 646 }; 647 648 #define NGQF_TYPE 0x03 /* MASK of content definition */ 649 #define NGQF_MESG 0x00 /* the queue element is a message */ 650 #define NGQF_DATA 0x01 /* the queue element is data */ 651 #define NGQF_FN 0x02 /* the queue element is a function */ 652 #define NGQF_FN2 0x03 /* the queue element is a new function */ 653 654 #define NGQF_RW 0x04 /* MASK for wanted queue mode */ 655 #define NGQF_READER 0x04 /* wants to be a reader */ 656 #define NGQF_WRITER 0x00 /* wants to be a writer */ 657 658 #define NGQF_QMODE 0x08 /* MASK for how it was queued */ 659 #define NGQF_QREADER 0x08 /* was queued as a reader */ 660 #define NGQF_QWRITER 0x00 /* was queued as a writer */ 661 662 /* 663 * Get the mbuf (etc) out of an item. 664 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM() 665 * with it, (to avoid freeing the things twice). 666 * If you don't want to zero out the item then realise that the 667 * item still owns it. 668 * Retaddr is different. There are no references on that. It's just a number. 669 * The debug versions must be either all used everywhere or not at all. 670 */ 671 672 #define _NGI_M(i) ((i)->body.da_m) 673 #define _NGI_MSG(i) ((i)->body.msg.msg_msg) 674 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr) 675 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn) 676 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2) 677 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1) 678 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2) 679 #define _NGI_NODE(i) ((i)->el_dest) 680 #define _NGI_HOOK(i) ((i)->el_hook) 681 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0) 682 #define _NGI_CLR_HOOK(i) do { \ 683 hook_p _hook = _NGI_HOOK(i); \ 684 if (_hook) { \ 685 _NG_HOOK_UNREF(_hook); \ 686 _NGI_HOOK(i) = NULL; \ 687 } \ 688 } while (0) 689 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0) 690 #define _NGI_CLR_NODE(i) do { \ 691 node_p _node = _NGI_NODE(i); \ 692 if (_node) { \ 693 _NG_NODE_UNREF(_node); \ 694 _NGI_NODE(i) = NULL; \ 695 } \ 696 } while (0) 697 698 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 699 void dumpitem(item_p item, char *file, int line); 700 static __inline void _ngi_check(item_p item, char *file, int line) ; 701 static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ; 702 static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line); 703 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ; 704 static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ; 705 static __inline ng_item_fn2 ** _ngi_fn2(item_p item, char *file, int line) ; 706 static __inline void ** _ngi_arg1(item_p item, char *file, int line) ; 707 static __inline int * _ngi_arg2(item_p item, char *file, int line) ; 708 static __inline node_p _ngi_node(item_p item, char *file, int line); 709 static __inline hook_p _ngi_hook(item_p item, char *file, int line); 710 711 static __inline void 712 _ngi_check(item_p item, char *file, int line) 713 { 714 (item)->lastline = line; 715 (item)->lastfile = file; 716 } 717 718 static __inline struct mbuf ** 719 _ngi_m(item_p item, char *file, int line) 720 { 721 _ngi_check(item, file, line); 722 return (&_NGI_M(item)); 723 } 724 725 static __inline struct ng_mesg ** 726 _ngi_msg(item_p item, char *file, int line) 727 { 728 _ngi_check(item, file, line); 729 return (&_NGI_MSG(item)); 730 } 731 732 static __inline ng_ID_t * 733 _ngi_retaddr(item_p item, char *file, int line) 734 { 735 _ngi_check(item, file, line); 736 return (&_NGI_RETADDR(item)); 737 } 738 739 static __inline ng_item_fn ** 740 _ngi_fn(item_p item, char *file, int line) 741 { 742 _ngi_check(item, file, line); 743 return (&_NGI_FN(item)); 744 } 745 746 static __inline ng_item_fn2 ** 747 _ngi_fn2(item_p item, char *file, int line) 748 { 749 _ngi_check(item, file, line); 750 return (&_NGI_FN2(item)); 751 } 752 753 static __inline void ** 754 _ngi_arg1(item_p item, char *file, int line) 755 { 756 _ngi_check(item, file, line); 757 return (&_NGI_ARG1(item)); 758 } 759 760 static __inline int * 761 _ngi_arg2(item_p item, char *file, int line) 762 { 763 _ngi_check(item, file, line); 764 return (&_NGI_ARG2(item)); 765 } 766 767 static __inline node_p 768 _ngi_node(item_p item, char *file, int line) 769 { 770 _ngi_check(item, file, line); 771 return (_NGI_NODE(item)); 772 } 773 774 static __inline hook_p 775 _ngi_hook(item_p item, char *file, int line) 776 { 777 _ngi_check(item, file, line); 778 return (_NGI_HOOK(item)); 779 } 780 781 #define NGI_M(i) (*_ngi_m(i, _NN_)) 782 #define NGI_MSG(i) (*_ngi_msg(i, _NN_)) 783 #define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_)) 784 #define NGI_FN(i) (*_ngi_fn(i, _NN_)) 785 #define NGI_FN2(i) (*_ngi_fn2(i, _NN_)) 786 #define NGI_ARG1(i) (*_ngi_arg1(i, _NN_)) 787 #define NGI_ARG2(i) (*_ngi_arg2(i, _NN_)) 788 #define NGI_HOOK(i) _ngi_hook(i, _NN_) 789 #define NGI_NODE(i) _ngi_node(i, _NN_) 790 #define NGI_SET_HOOK(i,h) \ 791 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0) 792 #define NGI_CLR_HOOK(i) \ 793 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0) 794 #define NGI_SET_NODE(i,n) \ 795 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0) 796 #define NGI_CLR_NODE(i) \ 797 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0) 798 799 #define NG_FREE_ITEM(item) \ 800 do { \ 801 _ngi_check(item, _NN_); \ 802 ng_free_item((item)); \ 803 } while (0) 804 805 #define SAVE_LINE(item) \ 806 do { \ 807 (item)->lastline = __LINE__; \ 808 (item)->lastfile = __FILE__; \ 809 } while (0) 810 811 #else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 812 813 #define NGI_M(i) _NGI_M(i) 814 #define NGI_MSG(i) _NGI_MSG(i) 815 #define NGI_RETADDR(i) _NGI_RETADDR(i) 816 #define NGI_FN(i) _NGI_FN(i) 817 #define NGI_FN2(i) _NGI_FN2(i) 818 #define NGI_ARG1(i) _NGI_ARG1(i) 819 #define NGI_ARG2(i) _NGI_ARG2(i) 820 #define NGI_NODE(i) _NGI_NODE(i) 821 #define NGI_HOOK(i) _NGI_HOOK(i) 822 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h) 823 #define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i) 824 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n) 825 #define NGI_CLR_NODE(i) _NGI_CLR_NODE(i) 826 827 #define NG_FREE_ITEM(item) ng_free_item((item)) 828 #define SAVE_LINE(item) do {} while (0) 829 830 #endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 831 832 #define NGI_GET_M(i,m) \ 833 do { \ 834 (m) = NGI_M(i); \ 835 _NGI_M(i) = NULL; \ 836 } while (0) 837 838 #define NGI_GET_MSG(i,m) \ 839 do { \ 840 (m) = NGI_MSG(i); \ 841 _NGI_MSG(i) = NULL; \ 842 } while (0) 843 844 #define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \ 845 do { \ 846 (n) = NGI_NODE(i); \ 847 _NGI_NODE(i) = NULL; \ 848 } while (0) 849 850 #define NGI_GET_HOOK(i,h) \ 851 do { \ 852 (h) = NGI_HOOK(i); \ 853 _NGI_HOOK(i) = NULL; \ 854 } while (0) 855 856 #define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE) 857 #define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER) 858 859 #define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER) 860 #define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER) 861 862 /********************************************************************** 863 * Data macros. Send, manipulate and free. 864 **********************************************************************/ 865 /* 866 * Assuming the data is already ok, just set the new address and send 867 */ 868 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \ 869 do { \ 870 (error) = \ 871 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \ 872 if (error == 0) { \ 873 SAVE_LINE(item); \ 874 (error) = ng_snd_item((item), (flags)); \ 875 } \ 876 (item) = NULL; \ 877 } while (0) 878 #define NG_FWD_ITEM_HOOK(error, item, hook) \ 879 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS) 880 881 /* 882 * Forward a data packet. Mbuf pointer is updated to new value. We 883 * presume you dealt with the old one when you update it to the new one 884 * (or it maybe the old one). We got a packet and possibly had to modify 885 * the mbuf. You should probably use NGI_GET_M() if you are going to use 886 * this too. 887 */ 888 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \ 889 do { \ 890 NGI_M(item) = (m); \ 891 (m) = NULL; \ 892 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \ 893 } while (0) 894 #define NG_FWD_NEW_DATA(error, item, hook, m) \ 895 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS) 896 897 /* Send a previously unpackaged mbuf. XXX: This should be called 898 * NG_SEND_DATA in future, but this name is kept for compatibility 899 * reasons. 900 */ 901 #define NG_SEND_DATA_FLAGS(error, hook, m, flags) \ 902 do { \ 903 item_p _item; \ 904 if ((_item = ng_package_data((m), flags))) { \ 905 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\ 906 } else { \ 907 (error) = ENOMEM; \ 908 } \ 909 (m) = NULL; \ 910 } while (0) 911 912 #define NG_SEND_DATA_ONLY(error, hook, m) \ 913 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 914 /* NG_SEND_DATA() compat for meta-data times */ 915 #define NG_SEND_DATA(error, hook, m, x) \ 916 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 917 918 #define NG_FREE_MSG(msg) \ 919 do { \ 920 if ((msg)) { \ 921 FREE((msg), M_NETGRAPH_MSG); \ 922 (msg) = NULL; \ 923 } \ 924 } while (0) 925 926 #define NG_FREE_M(m) \ 927 do { \ 928 if ((m)) { \ 929 m_freem((m)); \ 930 (m) = NULL; \ 931 } \ 932 } while (0) 933 934 /***************************************** 935 * Message macros 936 *****************************************/ 937 938 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \ 939 do { \ 940 item_p _item; \ 941 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 942 (msg) = NULL; \ 943 (error) = ENOMEM; \ 944 break; \ 945 } \ 946 if (((error) = ng_address_hook((here), (_item), \ 947 (hook), (retaddr))) == 0) { \ 948 SAVE_LINE(_item); \ 949 (error) = ng_snd_item((_item), 0); \ 950 } \ 951 (msg) = NULL; \ 952 } while (0) 953 954 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \ 955 do { \ 956 item_p _item; \ 957 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 958 (msg) = NULL; \ 959 (error) = ENOMEM; \ 960 break; \ 961 } \ 962 if (((error) = ng_address_path((here), (_item), \ 963 (path), (retaddr))) == 0) { \ 964 SAVE_LINE(_item); \ 965 (error) = ng_snd_item((_item), 0); \ 966 } \ 967 (msg) = NULL; \ 968 } while (0) 969 970 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \ 971 do { \ 972 item_p _item; \ 973 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 974 (msg) = NULL; \ 975 (error) = ENOMEM; \ 976 break; \ 977 } \ 978 if (((error) = ng_address_ID((here), (_item), \ 979 (ID), (retaddr))) == 0) { \ 980 SAVE_LINE(_item); \ 981 (error) = ng_snd_item((_item), 0); \ 982 } \ 983 (msg) = NULL; \ 984 } while (0) 985 986 /* 987 * Redirect the message to the next hop using the given hook. 988 * ng_retarget_msg() frees the item if there is an error 989 * and returns an error code. It returns 0 on success. 990 */ 991 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \ 992 do { \ 993 if (((error) = ng_address_hook((here), (item), \ 994 (hook), (retaddr))) == 0) { \ 995 SAVE_LINE(item); \ 996 (error) = ng_snd_item((item), 0); \ 997 } \ 998 (item) = NULL; \ 999 } while (0) 1000 1001 /* 1002 * Send a queue item back to it's originator with a response message. 1003 * Assume original message was removed and freed separatly. 1004 */ 1005 #define NG_RESPOND_MSG(error, here, item, resp) \ 1006 do { \ 1007 if (resp) { \ 1008 ng_ID_t _dest = NGI_RETADDR(item); \ 1009 NGI_RETADDR(item) = 0; \ 1010 NGI_MSG(item) = resp; \ 1011 if ((error = ng_address_ID((here), (item), \ 1012 _dest, 0)) == 0) { \ 1013 SAVE_LINE(item); \ 1014 (error) = ng_snd_item((item), NG_QUEUE);\ 1015 } \ 1016 } else \ 1017 NG_FREE_ITEM(item); \ 1018 (item) = NULL; \ 1019 } while (0) 1020 1021 1022 /*********************************************************************** 1023 ******** Structures Definitions and Macros for defining a node ******* 1024 *********************************************************************** 1025 * 1026 * Here we define the structures needed to actually define a new node 1027 * type. 1028 */ 1029 1030 /* 1031 * Command list -- each node type specifies the command that it knows 1032 * how to convert between ASCII and binary using an array of these. 1033 * The last element in the array must be a terminator with cookie=0. 1034 */ 1035 1036 struct ng_cmdlist { 1037 u_int32_t cookie; /* command typecookie */ 1038 int cmd; /* command number */ 1039 const char *name; /* command name */ 1040 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 1041 const struct ng_parse_type *respType; /* args if NGF_RESP */ 1042 }; 1043 1044 /* 1045 * Structure of a node type 1046 * If data is sent to the "rcvdata()" entrypoint then the system 1047 * may decide to defer it until later by queing it with the normal netgraph 1048 * input queuing system. This is decidde by the HK_QUEUE flag being set in 1049 * the flags word of the peer (receiving) hook. The dequeuing mechanism will 1050 * ensure it is not requeued again. 1051 * Note the input queueing system is to allow modules 1052 * to 'release the stack' or to pass data across spl layers. 1053 * The data will be redelivered as soon as the NETISR code runs 1054 * which may be almost immediatly. A node may also do it's own queueing 1055 * for other reasons (e.g. device output queuing). 1056 */ 1057 struct ng_type { 1058 1059 u_int32_t version; /* must equal NG_API_VERSION */ 1060 const char *name; /* Unique type name */ 1061 modeventhand_t mod_event; /* Module event handler (optional) */ 1062 ng_constructor_t *constructor; /* Node constructor */ 1063 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 1064 ng_close_t *close; /* warn about forthcoming shutdown */ 1065 ng_shutdown_t *shutdown; /* reset, and free resources */ 1066 ng_newhook_t *newhook; /* first notification of new hook */ 1067 ng_findhook_t *findhook; /* only if you have lots of hooks */ 1068 ng_connect_t *connect; /* final notification of new hook */ 1069 ng_rcvdata_t *rcvdata; /* data comes here */ 1070 ng_disconnect_t *disconnect; /* notify on disconnect */ 1071 1072 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 1073 1074 /* R/W data private to the base netgraph code DON'T TOUCH! */ 1075 LIST_ENTRY(ng_type) types; /* linked list of all types */ 1076 int refs; /* number of instances */ 1077 }; 1078 1079 /* 1080 * Use the NETGRAPH_INIT() macro to link a node type into the 1081 * netgraph system. This works for types compiled into the kernel 1082 * as well as KLD modules. The first argument should be the type 1083 * name (eg, echo) and the second a pointer to the type struct. 1084 * 1085 * If a different link time is desired, e.g., a device driver that 1086 * needs to install its netgraph type before probing, use the 1087 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably 1088 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST. 1089 */ 1090 1091 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 1092 static moduledata_t ng_##typename##_mod = { \ 1093 "ng_" #typename, \ 1094 ng_mod_event, \ 1095 (typestructp) \ 1096 }; \ 1097 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \ 1098 MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \ 1099 NG_ABI_VERSION, \ 1100 NG_ABI_VERSION) 1101 1102 #define NETGRAPH_INIT(tn, tp) \ 1103 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 1104 1105 /* Special malloc() type for netgraph structs and ctrl messages */ 1106 /* Only these two types should be visible to nodes */ 1107 MALLOC_DECLARE(M_NETGRAPH); 1108 MALLOC_DECLARE(M_NETGRAPH_MSG); 1109 1110 /* declare the base of the netgraph sysclt hierarchy */ 1111 /* but only if this file cares about sysctls */ 1112 #ifdef SYSCTL_DECL 1113 SYSCTL_DECL(_net_graph); 1114 #endif 1115 1116 /* 1117 * Methods that the nodes can use. 1118 * Many of these methods should usually NOT be used directly but via 1119 * Macros above. 1120 */ 1121 int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr); 1122 int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr); 1123 int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr); 1124 int ng_bypass(hook_p hook1, hook_p hook2); 1125 hook_p ng_findhook(node_p node, const char *name); 1126 struct ng_type *ng_findtype(const char *type); 1127 int ng_make_node_common(struct ng_type *typep, node_p *nodep); 1128 int ng_name_node(node_p node, const char *name); 1129 int ng_newtype(struct ng_type *tp); 1130 ng_ID_t ng_node2ID(node_p node); 1131 item_p ng_package_data(struct mbuf *m, int flags); 1132 item_p ng_package_msg(struct ng_mesg *msg, int flags); 1133 item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg); 1134 void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr); 1135 int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */ 1136 int ng_rmnode_self(node_p here); /* if a node wants to suicide */ 1137 int ng_rmtype(struct ng_type *tp); 1138 int ng_snd_item(item_p item, int queue); 1139 int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1140 int arg2); 1141 int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1142 int arg2, int flags); 1143 int ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn, 1144 void *arg1, int arg2, int flags); 1145 int ng_uncallout(struct callout *c, node_p node); 1146 int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks, 1147 ng_item_fn *fn, void * arg1, int arg2); 1148 #define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE) 1149 1150 /* Flags for netgraph functions. */ 1151 #define NG_NOFLAGS 0x00000000 /* no special options */ 1152 #define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */ 1153 #define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */ 1154 /* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */ 1155 #define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */ 1156 #define NG_REUSE_ITEM 0x00000008 /* supplied item should be reused */ 1157 1158 /* 1159 * prototypes the user should DEFINITELY not use directly 1160 */ 1161 void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */ 1162 int ng_mod_event(module_t mod, int what, void *arg); 1163 1164 /* 1165 * Tag definitions and constants 1166 */ 1167 1168 #define NG_TAG_PRIO 1 1169 1170 struct ng_tag_prio { 1171 struct m_tag tag; 1172 char priority; 1173 char discardability; 1174 }; 1175 1176 #define NG_PRIO_CUTOFF 32 1177 #define NG_PRIO_LINKSTATE 64 1178 1179 /* Macros and declarations to keep compatibility with metadata, which 1180 * is obsoleted now. To be deleted. 1181 */ 1182 typedef void *meta_p; 1183 #define _NGI_META(i) NULL 1184 #define NGI_META(i) NULL 1185 #define NG_FREE_META(meta) 1186 #define NGI_GET_META(i,m) 1187 #define ng_copy_meta(meta) NULL 1188 1189 #endif /* _NETGRAPH_NETGRAPH_H_ */
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