netgraph.h revision 191816
1/* 2 * netgraph.h 3 */ 4 5/*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: head/sys/netgraph/netgraph.h 191816 2009-05-05 10:56:12Z zec $ 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 12 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 */ 83struct ng_hook ; 84struct ng_node ; 85struct ng_item ; 86typedef struct ng_item *item_p; 87typedef struct ng_node *node_p; 88typedef struct ng_hook *hook_p; 89 90/* node method definitions */ 91typedef int ng_constructor_t(node_p node); 92typedef int ng_close_t(node_p node); 93typedef int ng_shutdown_t(node_p node); 94typedef int ng_newhook_t(node_p node, hook_p hook, const char *name); 95typedef hook_p ng_findhook_t(node_p node, const char *name); 96typedef int ng_connect_t(hook_p hook); 97typedef int ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook); 98typedef int ng_rcvdata_t(hook_p hook, item_p item); 99typedef int ng_disconnect_t(hook_p hook); 100typedef 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 */ 108struct 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_type; /* tbd: hook data link type */ 113 struct ng_hook *hk_peer; /* the other end of this link */ 114 struct ng_node *hk_node; /* The node this hook is attached to */ 115 LIST_ENTRY(ng_hook) hk_hooks; /* linked list of all hooks on node */ 116 ng_rcvmsg_t *hk_rcvmsg; /* control messages come here */ 117 ng_rcvdata_t *hk_rcvdata; /* data comes here */ 118 int hk_refs; /* dont actually free this till 0 */ 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 */ 138void 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__ 162void dumphook (hook_p hook, char *file, int line); 163static __inline void _chkhook(hook_p hook, char *file, int line); 164static __inline void _ng_hook_ref(hook_p hook, char * file, int line); 165static __inline char * _ng_hook_name(hook_p hook, char * file, int line); 166static __inline void _ng_hook_unref(hook_p hook, char * file, int line); 167static __inline void _ng_hook_set_private(hook_p hook, 168 void * val, char * file, int line); 169static __inline void _ng_hook_set_rcvmsg(hook_p hook, 170 ng_rcvmsg_t *val, char * file, int line); 171static __inline void _ng_hook_set_rcvdata(hook_p hook, 172 ng_rcvdata_t *val, char * file, int line); 173static __inline void * _ng_hook_private(hook_p hook, char * file, int line); 174static __inline int _ng_hook_not_valid(hook_p hook, char * file, int line); 175static __inline int _ng_hook_is_valid(hook_p hook, char * file, int line); 176static __inline node_p _ng_hook_node(hook_p hook, char * file, int line); 177static __inline hook_p _ng_hook_peer(hook_p hook, char * file, int line); 178static __inline void _ng_hook_force_writer(hook_p hook, char * file, 179 int line); 180static __inline void _ng_hook_force_queue(hook_p hook, char * file, int line); 181 182static __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 193static __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 200static __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 207static __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 214static __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 221static __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 228static __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 235static __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 242static __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 249static __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 256static __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 263static __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 270static __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 277static __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 284static __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 */ 335struct ng_queue { 336 u_int q_flags; /* Current r/w/q lock flags */ 337 u_int q_flags2; /* Other queue flags */ 338 struct mtx q_mtx; 339 STAILQ_ENTRY(ng_node) q_work; /* nodes with work to do */ 340 STAILQ_HEAD(, ng_item) queue; /* actually items queue */ 341}; 342 343struct 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_numhooks; /* number of hooks */ 348 void *nd_private; /* node type dependant node ID */ 349 ng_ID_t nd_ID; /* Unique per node */ 350 LIST_HEAD(hooks, ng_hook) nd_hooks; /* linked list of node hooks */ 351 LIST_ENTRY(ng_node) nd_nodes; /* linked list of all nodes */ 352 LIST_ENTRY(ng_node) nd_idnodes; /* ID hash collision list */ 353 struct ng_queue nd_input_queue; /* input queue for locking */ 354 int nd_refs; /* # of references to this node */ 355 struct vnet *nd_vnet; /* network stack instance */ 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_FORCE_WRITER 0x00000004 /* Never multithread this node */ 369#define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */ 370#define NGF_CLOSING 0x00000008 /* ng_rmnode() at work */ 371#define NG_CLOSING NGF_CLOSING /* compat for old code */ 372#define NGF_REALLY_DIE 0x00000010 /* "persistent" node is unloading */ 373#define NG_REALLY_DIE NGF_REALLY_DIE /* compat for old code */ 374#define NGF_HI_STACK 0x00000020 /* node has hi stack usage */ 375#define NGF_TYPE1 0x10000000 /* reserved for type specific storage */ 376#define NGF_TYPE2 0x20000000 /* reserved for type specific storage */ 377#define NGF_TYPE3 0x40000000 /* reserved for type specific storage */ 378#define NGF_TYPE4 0x80000000 /* reserved for type specific storage */ 379 380/* 381 * Public methods for nodes. 382 * If you can't do it with these you probably shouldn't be doing it. 383 */ 384int ng_unref_node(node_p node); /* don't move this */ 385#define _NG_NODE_NAME(node) ((node)->nd_name + 0) 386#define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0) 387#define _NG_NODE_ID(node) ((node)->nd_ID + 0) 388#define _NG_NODE_REF(node) atomic_add_int(&(node)->nd_refs, 1) 389#define _NG_NODE_UNREF(node) ng_unref_node(node) 390#define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0) 391#define _NG_NODE_PRIVATE(node) ((node)->nd_private) 392#define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID)) 393#define _NG_NODE_NOT_VALID(node) ((node)->nd_flags & NGF_INVALID) 394#define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */ 395#define _NG_NODE_FORCE_WRITER(node) \ 396 do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0) 397#define _NG_NODE_HI_STACK(node) \ 398 do{ node->nd_flags |= NGF_HI_STACK; }while (0) 399#define _NG_NODE_REALLY_DIE(node) \ 400 do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0) 401#define _NG_NODE_REVIVE(node) \ 402 do { node->nd_flags &= ~NGF_INVALID; } while (0) 403/* 404 * The hook iterator. 405 * This macro will call a function of type ng_fn_eachhook for each 406 * hook attached to the node. If the function returns 0, then the 407 * iterator will stop and return a pointer to the hook that returned 0. 408 */ 409typedef int ng_fn_eachhook(hook_p hook, void* arg); 410#define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 411 do { \ 412 hook_p _hook; \ 413 (rethook) = NULL; \ 414 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) { \ 415 if ((fn)(_hook, arg) == 0) { \ 416 (rethook) = _hook; \ 417 break; \ 418 } \ 419 } \ 420 } while (0) 421 422#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 423void dumpnode(node_p node, char *file, int line); 424static __inline void _chknode(node_p node, char *file, int line); 425static __inline char * _ng_node_name(node_p node, char *file, int line); 426static __inline int _ng_node_has_name(node_p node, char *file, int line); 427static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line); 428static __inline void _ng_node_ref(node_p node, char *file, int line); 429static __inline int _ng_node_unref(node_p node, char *file, int line); 430static __inline void _ng_node_set_private(node_p node, void * val, 431 char *file, int line); 432static __inline void * _ng_node_private(node_p node, char *file, int line); 433static __inline int _ng_node_is_valid(node_p node, char *file, int line); 434static __inline int _ng_node_not_valid(node_p node, char *file, int line); 435static __inline int _ng_node_numhooks(node_p node, char *file, int line); 436static __inline void _ng_node_force_writer(node_p node, char *file, int line); 437static __inline hook_p _ng_node_foreach_hook(node_p node, 438 ng_fn_eachhook *fn, void *arg, char *file, int line); 439static __inline void _ng_node_revive(node_p node, char *file, int line); 440 441static __inline void 442_chknode(node_p node, char *file, int line) 443{ 444 if (node->nd_magic != ND_MAGIC) { 445 printf("Accessing freed node "); 446 dumpnode(node, file, line); 447 } 448 node->lastline = line; 449 node->lastfile = file; 450} 451 452static __inline char * 453_ng_node_name(node_p node, char *file, int line) 454{ 455 _chknode(node, file, line); 456 return(_NG_NODE_NAME(node)); 457} 458 459static __inline int 460_ng_node_has_name(node_p node, char *file, int line) 461{ 462 _chknode(node, file, line); 463 return(_NG_NODE_HAS_NAME(node)); 464} 465 466static __inline ng_ID_t 467_ng_node_id(node_p node, char *file, int line) 468{ 469 _chknode(node, file, line); 470 return(_NG_NODE_ID(node)); 471} 472 473static __inline void 474_ng_node_ref(node_p node, char *file, int line) 475{ 476 _chknode(node, file, line); 477 _NG_NODE_REF(node); 478} 479 480static __inline int 481_ng_node_unref(node_p node, char *file, int line) 482{ 483 _chknode(node, file, line); 484 return (_NG_NODE_UNREF(node)); 485} 486 487static __inline void 488_ng_node_set_private(node_p node, void * val, char *file, int line) 489{ 490 _chknode(node, file, line); 491 _NG_NODE_SET_PRIVATE(node, val); 492} 493 494static __inline void * 495_ng_node_private(node_p node, char *file, int line) 496{ 497 _chknode(node, file, line); 498 return (_NG_NODE_PRIVATE(node)); 499} 500 501static __inline int 502_ng_node_is_valid(node_p node, char *file, int line) 503{ 504 _chknode(node, file, line); 505 return(_NG_NODE_IS_VALID(node)); 506} 507 508static __inline int 509_ng_node_not_valid(node_p node, char *file, int line) 510{ 511 _chknode(node, file, line); 512 return(_NG_NODE_NOT_VALID(node)); 513} 514 515static __inline int 516_ng_node_numhooks(node_p node, char *file, int line) 517{ 518 _chknode(node, file, line); 519 return(_NG_NODE_NUMHOOKS(node)); 520} 521 522static __inline void 523_ng_node_force_writer(node_p node, char *file, int line) 524{ 525 _chknode(node, file, line); 526 _NG_NODE_FORCE_WRITER(node); 527} 528 529static __inline void 530_ng_node_hi_stack(node_p node, char *file, int line) 531{ 532 _chknode(node, file, line); 533 _NG_NODE_HI_STACK(node); 534} 535 536static __inline void 537_ng_node_really_die(node_p node, char *file, int line) 538{ 539 _chknode(node, file, line); 540 _NG_NODE_REALLY_DIE(node); 541} 542 543static __inline void 544_ng_node_revive(node_p node, char *file, int line) 545{ 546 _chknode(node, file, line); 547 _NG_NODE_REVIVE(node); 548} 549 550static __inline hook_p 551_ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg, 552 char *file, int line) 553{ 554 hook_p hook; 555 _chknode(node, file, line); 556 _NG_NODE_FOREACH_HOOK(node, fn, arg, hook); 557 return (hook); 558} 559 560#define NG_NODE_NAME(node) _ng_node_name(node, _NN_) 561#define NG_NODE_HAS_NAME(node) _ng_node_has_name(node, _NN_) 562#define NG_NODE_ID(node) _ng_node_id(node, _NN_) 563#define NG_NODE_REF(node) _ng_node_ref(node, _NN_) 564#define NG_NODE_UNREF(node) _ng_node_unref(node, _NN_) 565#define NG_NODE_SET_PRIVATE(node, val) _ng_node_set_private(node, val, _NN_) 566#define NG_NODE_PRIVATE(node) _ng_node_private(node, _NN_) 567#define NG_NODE_IS_VALID(node) _ng_node_is_valid(node, _NN_) 568#define NG_NODE_NOT_VALID(node) _ng_node_not_valid(node, _NN_) 569#define NG_NODE_FORCE_WRITER(node) _ng_node_force_writer(node, _NN_) 570#define NG_NODE_HI_STACK(node) _ng_node_hi_stack(node, _NN_) 571#define NG_NODE_REALLY_DIE(node) _ng_node_really_die(node, _NN_) 572#define NG_NODE_NUMHOOKS(node) _ng_node_numhooks(node, _NN_) 573#define NG_NODE_REVIVE(node) _ng_node_revive(node, _NN_) 574#define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 575 do { \ 576 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \ 577 } while (0) 578 579#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 580 581#define NG_NODE_NAME(node) _NG_NODE_NAME(node) 582#define NG_NODE_HAS_NAME(node) _NG_NODE_HAS_NAME(node) 583#define NG_NODE_ID(node) _NG_NODE_ID(node) 584#define NG_NODE_REF(node) _NG_NODE_REF(node) 585#define NG_NODE_UNREF(node) _NG_NODE_UNREF(node) 586#define NG_NODE_SET_PRIVATE(node, val) _NG_NODE_SET_PRIVATE(node, val) 587#define NG_NODE_PRIVATE(node) _NG_NODE_PRIVATE(node) 588#define NG_NODE_IS_VALID(node) _NG_NODE_IS_VALID(node) 589#define NG_NODE_NOT_VALID(node) _NG_NODE_NOT_VALID(node) 590#define NG_NODE_FORCE_WRITER(node) _NG_NODE_FORCE_WRITER(node) 591#define NG_NODE_HI_STACK(node) _NG_NODE_HI_STACK(node) 592#define NG_NODE_REALLY_DIE(node) _NG_NODE_REALLY_DIE(node) 593#define NG_NODE_NUMHOOKS(node) _NG_NODE_NUMHOOKS(node) 594#define NG_NODE_REVIVE(node) _NG_NODE_REVIVE(node) 595#define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) \ 596 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook) 597#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 598 599/*********************************************************************** 600 ************* Node Queue and Item Structures and Methods ************** 601 *********************************************************************** 602 * 603 */ 604typedef void ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2); 605typedef int ng_item_fn2(node_p node, struct ng_item *item, hook_p hook); 606typedef void ng_apply_t(void *context, int error); 607struct ng_apply_info { 608 ng_apply_t *apply; 609 void *context; 610 int refs; 611 int error; 612}; 613struct ng_item { 614 u_long el_flags; 615 STAILQ_ENTRY(ng_item) el_next; 616 node_p el_dest; /* The node it will be applied against (or NULL) */ 617 hook_p el_hook; /* Entering hook. Optional in Control messages */ 618 union { 619 struct mbuf *da_m; 620 struct { 621 struct ng_mesg *msg_msg; 622 ng_ID_t msg_retaddr; 623 } msg; 624 struct { 625 union { 626 ng_item_fn *fn_fn; 627 ng_item_fn2 *fn_fn2; 628 } fn_fn; 629 void *fn_arg1; 630 int fn_arg2; 631 } fn; 632 } body; 633 /* 634 * Optional callback called when item is being applied, 635 * and its context. 636 */ 637 struct ng_apply_info *apply; 638 u_int depth; 639#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 640 char *lastfile; 641 int lastline; 642 TAILQ_ENTRY(ng_item) all; /* all existing items */ 643#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 644}; 645 646#define NGQF_TYPE 0x03 /* MASK of content definition */ 647#define NGQF_MESG 0x00 /* the queue element is a message */ 648#define NGQF_DATA 0x01 /* the queue element is data */ 649#define NGQF_FN 0x02 /* the queue element is a function */ 650#define NGQF_FN2 0x03 /* the queue element is a new function */ 651 652#define NGQF_RW 0x04 /* MASK for wanted queue mode */ 653#define NGQF_READER 0x04 /* wants to be a reader */ 654#define NGQF_WRITER 0x00 /* wants to be a writer */ 655 656#define NGQF_QMODE 0x08 /* MASK for how it was queued */ 657#define NGQF_QREADER 0x08 /* was queued as a reader */ 658#define NGQF_QWRITER 0x00 /* was queued as a writer */ 659 660/* 661 * Get the mbuf (etc) out of an item. 662 * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM() 663 * with it, (to avoid freeing the things twice). 664 * If you don't want to zero out the item then realise that the 665 * item still owns it. 666 * Retaddr is different. There are no references on that. It's just a number. 667 * The debug versions must be either all used everywhere or not at all. 668 */ 669 670#define _NGI_M(i) ((i)->body.da_m) 671#define _NGI_MSG(i) ((i)->body.msg.msg_msg) 672#define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr) 673#define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn) 674#define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2) 675#define _NGI_ARG1(i) ((i)->body.fn.fn_arg1) 676#define _NGI_ARG2(i) ((i)->body.fn.fn_arg2) 677#define _NGI_NODE(i) ((i)->el_dest) 678#define _NGI_HOOK(i) ((i)->el_hook) 679#define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0) 680#define _NGI_CLR_HOOK(i) do { \ 681 hook_p _hook = _NGI_HOOK(i); \ 682 if (_hook) { \ 683 _NG_HOOK_UNREF(_hook); \ 684 _NGI_HOOK(i) = NULL; \ 685 } \ 686 } while (0) 687#define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0) 688#define _NGI_CLR_NODE(i) do { \ 689 node_p _node = _NGI_NODE(i); \ 690 if (_node) { \ 691 _NG_NODE_UNREF(_node); \ 692 _NGI_NODE(i) = NULL; \ 693 } \ 694 } while (0) 695 696#ifdef NETGRAPH_DEBUG /*----------------------------------------------*/ 697void dumpitem(item_p item, char *file, int line); 698static __inline void _ngi_check(item_p item, char *file, int line) ; 699static __inline struct mbuf ** _ngi_m(item_p item, char *file, int line) ; 700static __inline ng_ID_t * _ngi_retaddr(item_p item, char *file, int line); 701static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ; 702static __inline ng_item_fn ** _ngi_fn(item_p item, char *file, int line) ; 703static __inline ng_item_fn2 ** _ngi_fn2(item_p item, char *file, int line) ; 704static __inline void ** _ngi_arg1(item_p item, char *file, int line) ; 705static __inline int * _ngi_arg2(item_p item, char *file, int line) ; 706static __inline node_p _ngi_node(item_p item, char *file, int line); 707static __inline hook_p _ngi_hook(item_p item, char *file, int line); 708 709static __inline void 710_ngi_check(item_p item, char *file, int line) 711{ 712 (item)->lastline = line; 713 (item)->lastfile = file; 714} 715 716static __inline struct mbuf ** 717_ngi_m(item_p item, char *file, int line) 718{ 719 _ngi_check(item, file, line); 720 return (&_NGI_M(item)); 721} 722 723static __inline struct ng_mesg ** 724_ngi_msg(item_p item, char *file, int line) 725{ 726 _ngi_check(item, file, line); 727 return (&_NGI_MSG(item)); 728} 729 730static __inline ng_ID_t * 731_ngi_retaddr(item_p item, char *file, int line) 732{ 733 _ngi_check(item, file, line); 734 return (&_NGI_RETADDR(item)); 735} 736 737static __inline ng_item_fn ** 738_ngi_fn(item_p item, char *file, int line) 739{ 740 _ngi_check(item, file, line); 741 return (&_NGI_FN(item)); 742} 743 744static __inline ng_item_fn2 ** 745_ngi_fn2(item_p item, char *file, int line) 746{ 747 _ngi_check(item, file, line); 748 return (&_NGI_FN2(item)); 749} 750 751static __inline void ** 752_ngi_arg1(item_p item, char *file, int line) 753{ 754 _ngi_check(item, file, line); 755 return (&_NGI_ARG1(item)); 756} 757 758static __inline int * 759_ngi_arg2(item_p item, char *file, int line) 760{ 761 _ngi_check(item, file, line); 762 return (&_NGI_ARG2(item)); 763} 764 765static __inline node_p 766_ngi_node(item_p item, char *file, int line) 767{ 768 _ngi_check(item, file, line); 769 return (_NGI_NODE(item)); 770} 771 772static __inline hook_p 773_ngi_hook(item_p item, char *file, int line) 774{ 775 _ngi_check(item, file, line); 776 return (_NGI_HOOK(item)); 777} 778 779#define NGI_M(i) (*_ngi_m(i, _NN_)) 780#define NGI_MSG(i) (*_ngi_msg(i, _NN_)) 781#define NGI_RETADDR(i) (*_ngi_retaddr(i, _NN_)) 782#define NGI_FN(i) (*_ngi_fn(i, _NN_)) 783#define NGI_FN2(i) (*_ngi_fn2(i, _NN_)) 784#define NGI_ARG1(i) (*_ngi_arg1(i, _NN_)) 785#define NGI_ARG2(i) (*_ngi_arg2(i, _NN_)) 786#define NGI_HOOK(i) _ngi_hook(i, _NN_) 787#define NGI_NODE(i) _ngi_node(i, _NN_) 788#define NGI_SET_HOOK(i,h) \ 789 do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0) 790#define NGI_CLR_HOOK(i) \ 791 do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0) 792#define NGI_SET_NODE(i,n) \ 793 do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0) 794#define NGI_CLR_NODE(i) \ 795 do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0) 796 797#define NG_FREE_ITEM(item) \ 798 do { \ 799 _ngi_check(item, _NN_); \ 800 ng_free_item((item)); \ 801 } while (0) 802 803#define SAVE_LINE(item) \ 804 do { \ 805 (item)->lastline = __LINE__; \ 806 (item)->lastfile = __FILE__; \ 807 } while (0) 808 809#else /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 810 811#define NGI_M(i) _NGI_M(i) 812#define NGI_MSG(i) _NGI_MSG(i) 813#define NGI_RETADDR(i) _NGI_RETADDR(i) 814#define NGI_FN(i) _NGI_FN(i) 815#define NGI_FN2(i) _NGI_FN2(i) 816#define NGI_ARG1(i) _NGI_ARG1(i) 817#define NGI_ARG2(i) _NGI_ARG2(i) 818#define NGI_NODE(i) _NGI_NODE(i) 819#define NGI_HOOK(i) _NGI_HOOK(i) 820#define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h) 821#define NGI_CLR_HOOK(i) _NGI_CLR_HOOK(i) 822#define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n) 823#define NGI_CLR_NODE(i) _NGI_CLR_NODE(i) 824 825#define NG_FREE_ITEM(item) ng_free_item((item)) 826#define SAVE_LINE(item) do {} while (0) 827 828#endif /* NETGRAPH_DEBUG */ /*----------------------------------------------*/ 829 830#define NGI_GET_M(i,m) \ 831 do { \ 832 (m) = NGI_M(i); \ 833 _NGI_M(i) = NULL; \ 834 } while (0) 835 836#define NGI_GET_MSG(i,m) \ 837 do { \ 838 (m) = NGI_MSG(i); \ 839 _NGI_MSG(i) = NULL; \ 840 } while (0) 841 842#define NGI_GET_NODE(i,n) /* YOU NOW HAVE THE REFERENCE */ \ 843 do { \ 844 (n) = NGI_NODE(i); \ 845 _NGI_NODE(i) = NULL; \ 846 } while (0) 847 848#define NGI_GET_HOOK(i,h) \ 849 do { \ 850 (h) = NGI_HOOK(i); \ 851 _NGI_HOOK(i) = NULL; \ 852 } while (0) 853 854#define NGI_SET_WRITER(i) ((i)->el_flags &= ~NGQF_QMODE) 855#define NGI_SET_READER(i) ((i)->el_flags |= NGQF_QREADER) 856 857#define NGI_QUEUED_READER(i) ((i)->el_flags & NGQF_QREADER) 858#define NGI_QUEUED_WRITER(i) (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER) 859 860/********************************************************************** 861* Data macros. Send, manipulate and free. 862**********************************************************************/ 863/* 864 * Assuming the data is already ok, just set the new address and send 865 */ 866#define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags) \ 867 do { \ 868 (error) = \ 869 ng_address_hook(NULL, (item), (hook), NG_NOFLAGS); \ 870 if (error == 0) { \ 871 SAVE_LINE(item); \ 872 (error) = ng_snd_item((item), (flags)); \ 873 } \ 874 (item) = NULL; \ 875 } while (0) 876#define NG_FWD_ITEM_HOOK(error, item, hook) \ 877 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS) 878 879/* 880 * Forward a data packet. Mbuf pointer is updated to new value. We 881 * presume you dealt with the old one when you update it to the new one 882 * (or it maybe the old one). We got a packet and possibly had to modify 883 * the mbuf. You should probably use NGI_GET_M() if you are going to use 884 * this too. 885 */ 886#define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags) \ 887 do { \ 888 NGI_M(item) = (m); \ 889 (m) = NULL; \ 890 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags); \ 891 } while (0) 892#define NG_FWD_NEW_DATA(error, item, hook, m) \ 893 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS) 894 895/* Send a previously unpackaged mbuf. XXX: This should be called 896 * NG_SEND_DATA in future, but this name is kept for compatibility 897 * reasons. 898 */ 899#define NG_SEND_DATA_FLAGS(error, hook, m, flags) \ 900 do { \ 901 item_p _item; \ 902 if ((_item = ng_package_data((m), flags))) { \ 903 NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\ 904 } else { \ 905 (error) = ENOMEM; \ 906 } \ 907 (m) = NULL; \ 908 } while (0) 909 910#define NG_SEND_DATA_ONLY(error, hook, m) \ 911 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 912/* NG_SEND_DATA() compat for meta-data times */ 913#define NG_SEND_DATA(error, hook, m, x) \ 914 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS) 915 916#define NG_FREE_MSG(msg) \ 917 do { \ 918 if ((msg)) { \ 919 free((msg), M_NETGRAPH_MSG); \ 920 (msg) = NULL; \ 921 } \ 922 } while (0) 923 924#define NG_FREE_M(m) \ 925 do { \ 926 if ((m)) { \ 927 m_freem((m)); \ 928 (m) = NULL; \ 929 } \ 930 } while (0) 931 932/***************************************** 933* Message macros 934*****************************************/ 935 936#define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr) \ 937 do { \ 938 item_p _item; \ 939 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 940 (msg) = NULL; \ 941 (error) = ENOMEM; \ 942 break; \ 943 } \ 944 if (((error) = ng_address_hook((here), (_item), \ 945 (hook), (retaddr))) == 0) { \ 946 SAVE_LINE(_item); \ 947 (error) = ng_snd_item((_item), 0); \ 948 } \ 949 (msg) = NULL; \ 950 } while (0) 951 952#define NG_SEND_MSG_PATH(error, here, msg, path, retaddr) \ 953 do { \ 954 item_p _item; \ 955 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 956 (msg) = NULL; \ 957 (error) = ENOMEM; \ 958 break; \ 959 } \ 960 if (((error) = ng_address_path((here), (_item), \ 961 (path), (retaddr))) == 0) { \ 962 SAVE_LINE(_item); \ 963 (error) = ng_snd_item((_item), 0); \ 964 } \ 965 (msg) = NULL; \ 966 } while (0) 967 968#define NG_SEND_MSG_ID(error, here, msg, ID, retaddr) \ 969 do { \ 970 item_p _item; \ 971 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\ 972 (msg) = NULL; \ 973 (error) = ENOMEM; \ 974 break; \ 975 } \ 976 if (((error) = ng_address_ID((here), (_item), \ 977 (ID), (retaddr))) == 0) { \ 978 SAVE_LINE(_item); \ 979 (error) = ng_snd_item((_item), 0); \ 980 } \ 981 (msg) = NULL; \ 982 } while (0) 983 984/* 985 * Redirect the message to the next hop using the given hook. 986 * ng_retarget_msg() frees the item if there is an error 987 * and returns an error code. It returns 0 on success. 988 */ 989#define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr) \ 990 do { \ 991 if (((error) = ng_address_hook((here), (item), \ 992 (hook), (retaddr))) == 0) { \ 993 SAVE_LINE(item); \ 994 (error) = ng_snd_item((item), 0); \ 995 } \ 996 (item) = NULL; \ 997 } while (0) 998 999/* 1000 * Send a queue item back to it's originator with a response message. 1001 * Assume original message was removed and freed separatly. 1002 */ 1003#define NG_RESPOND_MSG(error, here, item, resp) \ 1004 do { \ 1005 if (resp) { \ 1006 ng_ID_t _dest = NGI_RETADDR(item); \ 1007 NGI_RETADDR(item) = 0; \ 1008 NGI_MSG(item) = resp; \ 1009 if ((error = ng_address_ID((here), (item), \ 1010 _dest, 0)) == 0) { \ 1011 SAVE_LINE(item); \ 1012 (error) = ng_snd_item((item), NG_QUEUE);\ 1013 } \ 1014 } else \ 1015 NG_FREE_ITEM(item); \ 1016 (item) = NULL; \ 1017 } while (0) 1018 1019 1020/*********************************************************************** 1021 ******** Structures Definitions and Macros for defining a node ******* 1022 *********************************************************************** 1023 * 1024 * Here we define the structures needed to actually define a new node 1025 * type. 1026 */ 1027 1028/* 1029 * Command list -- each node type specifies the command that it knows 1030 * how to convert between ASCII and binary using an array of these. 1031 * The last element in the array must be a terminator with cookie=0. 1032 */ 1033 1034struct ng_cmdlist { 1035 u_int32_t cookie; /* command typecookie */ 1036 int cmd; /* command number */ 1037 const char *name; /* command name */ 1038 const struct ng_parse_type *mesgType; /* args if !NGF_RESP */ 1039 const struct ng_parse_type *respType; /* args if NGF_RESP */ 1040}; 1041 1042/* 1043 * Structure of a node type 1044 * If data is sent to the "rcvdata()" entrypoint then the system 1045 * may decide to defer it until later by queing it with the normal netgraph 1046 * input queuing system. This is decidde by the HK_QUEUE flag being set in 1047 * the flags word of the peer (receiving) hook. The dequeuing mechanism will 1048 * ensure it is not requeued again. 1049 * Note the input queueing system is to allow modules 1050 * to 'release the stack' or to pass data across spl layers. 1051 * The data will be redelivered as soon as the NETISR code runs 1052 * which may be almost immediatly. A node may also do it's own queueing 1053 * for other reasons (e.g. device output queuing). 1054 */ 1055struct ng_type { 1056 1057 u_int32_t version; /* must equal NG_API_VERSION */ 1058 const char *name; /* Unique type name */ 1059 modeventhand_t mod_event; /* Module event handler (optional) */ 1060 ng_constructor_t *constructor; /* Node constructor */ 1061 ng_rcvmsg_t *rcvmsg; /* control messages come here */ 1062 ng_close_t *close; /* warn about forthcoming shutdown */ 1063 ng_shutdown_t *shutdown; /* reset, and free resources */ 1064 ng_newhook_t *newhook; /* first notification of new hook */ 1065 ng_findhook_t *findhook; /* only if you have lots of hooks */ 1066 ng_connect_t *connect; /* final notification of new hook */ 1067 ng_rcvdata_t *rcvdata; /* data comes here */ 1068 ng_disconnect_t *disconnect; /* notify on disconnect */ 1069 1070 const struct ng_cmdlist *cmdlist; /* commands we can convert */ 1071 1072 /* R/W data private to the base netgraph code DON'T TOUCH! */ 1073 LIST_ENTRY(ng_type) types; /* linked list of all types */ 1074 int refs; /* number of instances */ 1075}; 1076 1077/* 1078 * Use the NETGRAPH_INIT() macro to link a node type into the 1079 * netgraph system. This works for types compiled into the kernel 1080 * as well as KLD modules. The first argument should be the type 1081 * name (eg, echo) and the second a pointer to the type struct. 1082 * 1083 * If a different link time is desired, e.g., a device driver that 1084 * needs to install its netgraph type before probing, use the 1085 * NETGRAPH_INIT_ORDERED() macro instead. Device drivers probably 1086 * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST. 1087 */ 1088 1089#define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order) \ 1090static moduledata_t ng_##typename##_mod = { \ 1091 "ng_" #typename, \ 1092 ng_mod_event, \ 1093 (typestructp) \ 1094}; \ 1095DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order); \ 1096MODULE_DEPEND(ng_##typename, netgraph, NG_ABI_VERSION, \ 1097 NG_ABI_VERSION, \ 1098 NG_ABI_VERSION) 1099 1100#define NETGRAPH_INIT(tn, tp) \ 1101 NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY) 1102 1103/* Special malloc() type for netgraph structs and ctrl messages */ 1104/* Only these two types should be visible to nodes */ 1105MALLOC_DECLARE(M_NETGRAPH); 1106MALLOC_DECLARE(M_NETGRAPH_MSG); 1107 1108/* declare the base of the netgraph sysclt hierarchy */ 1109/* but only if this file cares about sysctls */ 1110#ifdef SYSCTL_DECL 1111SYSCTL_DECL(_net_graph); 1112#endif 1113 1114/* 1115 * Methods that the nodes can use. 1116 * Many of these methods should usually NOT be used directly but via 1117 * Macros above. 1118 */ 1119int ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr); 1120int ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr); 1121int ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr); 1122int ng_bypass(hook_p hook1, hook_p hook2); 1123hook_p ng_findhook(node_p node, const char *name); 1124struct ng_type *ng_findtype(const char *type); 1125int ng_make_node_common(struct ng_type *typep, node_p *nodep); 1126int ng_name_node(node_p node, const char *name); 1127node_p ng_name2noderef(node_p node, const char *name); 1128int ng_newtype(struct ng_type *tp); 1129ng_ID_t ng_node2ID(node_p node); 1130item_p ng_package_data(struct mbuf *m, int flags); 1131item_p ng_package_msg(struct ng_mesg *msg, int flags); 1132item_p ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg); 1133void ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr); 1134int ng_rmhook_self(hook_p hook); /* if a node wants to kill a hook */ 1135int ng_rmnode_self(node_p here); /* if a node wants to suicide */ 1136int ng_rmtype(struct ng_type *tp); 1137int ng_snd_item(item_p item, int queue); 1138int ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1139 int arg2); 1140int ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1, 1141 int arg2, int flags); 1142int ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn, 1143 void *arg1, int arg2, int flags); 1144int ng_uncallout(struct callout *c, node_p node); 1145int ng_callout(struct callout *c, node_p node, hook_p hook, int ticks, 1146 ng_item_fn *fn, void * arg1, int arg2); 1147#define ng_callout_init(c) callout_init(c, CALLOUT_MPSAFE) 1148 1149/* Flags for netgraph functions. */ 1150#define NG_NOFLAGS 0x00000000 /* no special options */ 1151#define NG_QUEUE 0x00000001 /* enqueue item, don't dispatch */ 1152#define NG_WAITOK 0x00000002 /* use M_WAITOK, etc. */ 1153/* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */ 1154#define NG_PROGRESS 0x00000004 /* return EINPROGRESS if queued */ 1155#define NG_REUSE_ITEM 0x00000008 /* supplied item should be reused */ 1156 1157/* 1158 * prototypes the user should DEFINITELY not use directly 1159 */ 1160void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */ 1161int ng_mod_event(module_t mod, int what, void *arg); 1162 1163/* 1164 * Tag definitions and constants 1165 */ 1166 1167#define NG_TAG_PRIO 1 1168 1169struct ng_tag_prio { 1170 struct m_tag tag; 1171 char priority; 1172 char discardability; 1173}; 1174 1175#define NG_PRIO_CUTOFF 32 1176#define NG_PRIO_LINKSTATE 64 1177 1178/* Macros and declarations to keep compatibility with metadata, which 1179 * is obsoleted now. To be deleted. 1180 */ 1181typedef void *meta_p; 1182#define _NGI_META(i) NULL 1183#define NGI_META(i) NULL 1184#define NG_FREE_META(meta) 1185#define NGI_GET_META(i,m) 1186#define ng_copy_meta(meta) NULL 1187 1188/* Hash related definitions */ 1189#define NG_ID_HASH_SIZE 128 /* most systems wont need even this many */ 1190#define NG_NAME_HASH_SIZE 128 /* most systems wont need even this many */ 1191 1192/* Virtualization macros */ 1193#define INIT_VNET_NETGRAPH(vnet) \ 1194 INIT_FROM_VNET(vnet, VNET_MOD_NETGRAPH, \ 1195 struct vnet_netgraph, vnet_netgraph) 1196 1197#define VNET_NETGRAPH(sym) VSYM(vnet_netgraph, sym) 1198 1199struct vnet_netgraph { 1200 LIST_HEAD(, ng_node) _ng_ID_hash[NG_ID_HASH_SIZE]; 1201 LIST_HEAD(, ng_node) _ng_name_hash[NG_NAME_HASH_SIZE]; 1202 LIST_HEAD(, ng_node) _ng_nodelist; 1203 ng_ID_t _nextID; 1204 struct unrhdr *_ng_iface_unit; 1205 struct unrhdr *_ng_eiface_unit; 1206 struct unrhdr *_ng_wormhole_unit; 1207}; 1208 1209#ifndef VIMAGE 1210#ifndef VIMAGE_GLOBALS 1211extern struct vnet_netgraph vnet_netgraph_0; 1212#endif 1213#endif 1214 1215/* Symbol translation macros */ 1216#define V_nextID VNET_NETGRAPH(nextID) 1217#define V_ng_ID_hash VNET_NETGRAPH(ng_ID_hash) 1218#define V_ng_eiface_unit VNET_NETGRAPH(ng_eiface_unit) 1219#define V_ng_iface_unit VNET_NETGRAPH(ng_iface_unit) 1220#define V_ng_name_hash VNET_NETGRAPH(ng_name_hash) 1221#define V_ng_nodelist VNET_NETGRAPH(ng_nodelist) 1222#define V_ng_wormhole_unit VNET_NETGRAPH(ng_wormhole_unit) 1223 1224#endif /* _NETGRAPH_NETGRAPH_H_ */ 1225