sys/netgraph7/netgraph.h

   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: src/sys/netgraph/netgraph.h,v 1.74 2008/06/24 18:49:49 gnn Exp $
  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/malloc.h>
  53 #include <sys/module.h>
  54 #include <sys/mutex2.h>
  55 #include <netgraph7/ng_message.h>       /* NG_HOOKSIZ, NG_NODESIZ */
  56 #include "dragonfly.h"
  57
  58 #ifdef HAVE_KERNEL_OPTION_HEADERS
  59 #include "opt_netgraph.h"
  60 #endif
  61
  62 /* debugging options */
  63 #define NG_SEPARATE_MALLOC      /* make modules use their own malloc types */
  64
  65 /*
  66  * This defines the in-kernel binary interface version.
  67  * It is possible to change this but leave the external message
  68  * API the same. Each type also has it's own cookies for versioning as well.
  69  * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
  70  * modules.
  71  */
  72 #define _NG_ABI_VERSION 12
  73 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  74 #define NG_ABI_VERSION  (_NG_ABI_VERSION + 0x10000)
  75 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  76 #define NG_ABI_VERSION  _NG_ABI_VERSION
  77 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  78
  79
  80 /*
  81  * Forward references for the basic structures so we can
  82  * define the typedefs and use them in the structures themselves.
  83  */
  84 struct ng_hook ;
  85 struct ng_node ;
  86 struct ng_item ;
  87 struct ng_apply_info ;
  88 typedef struct ng_apply_info *apply_p;
  89 typedef struct ng_item *item_p;
  90 typedef struct ng_node *node_p;
  91 typedef struct ng_hook *hook_p;
  92
  93 /* node method definitions */
  94 typedef int     ng_constructor_t(node_p node);
  95 typedef int     ng_close_t(node_p node);
  96 typedef int     ng_shutdown_t(node_p node);
  97 typedef int     ng_newhook_t(node_p node, hook_p hook, const char *name);
  98 typedef hook_p  ng_findhook_t(node_p node, const char *name);
  99 typedef int     ng_connect_t(hook_p hook);
 100 typedef int     ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
 101 typedef int     ng_rcvdata_t(hook_p hook, item_p item);
 102 typedef int     ng_disconnect_t(hook_p hook);
 103 typedef int     ng_rcvitem (node_p node, hook_p hook, item_p item);
 104
 105 /***********************************************************************
 106  ***************** Hook Structure and Methods **************************
 107  ***********************************************************************
 108  *
 109  * Structure of a hook
 110  */
 111 struct ng_hook {
 112         char    hk_name[NG_HOOKSIZ];    /* what this node knows this link as */
 113         void   *hk_private;             /* node dependant ID for this hook */
 114         int     hk_flags;               /* info about this hook/link */
 115         int     hk_type;                /* tbd: hook data link type */
 116         struct  ng_hook *hk_peer;       /* the other end of this link */
 117         struct  ng_node *hk_node;       /* The node this hook is attached to */
 118         LIST_ENTRY(ng_hook) hk_hooks;   /* linked list of all hooks on node */
 119         ng_rcvmsg_t     *hk_rcvmsg;     /* control messages come here */
 120         ng_rcvdata_t    *hk_rcvdata;    /* data comes here */
 121         int     hk_refs;                /* dont actually free this till 0 */
 122 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 123 #define HK_MAGIC 0x78573011
 124         int     hk_magic;
 125         char    *lastfile;
 126         int     lastline;
 127         SLIST_ENTRY(ng_hook)      hk_all;               /* all existing items */
 128 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 129 };
 130 /* Flags for a hook */
 131 #define HK_INVALID              0x0001  /* don't trust it! */
 132 #define HK_QUEUE                0x0002  /* queue for later delivery */
 133 #define HK_FORCE_WRITER         0x0004  /* Incoming data queued as a writer */
 134 #define HK_DEAD                 0x0008  /* This is the dead hook.. don't free */
 135 #define HK_HI_STACK             0x0010  /* Hook has hi stack usage */
 136
 137 /*
 138  * Public Methods for hook
 139  * If you can't do it with these you probably shouldn;t be doing it.
 140  */
 141 void ng_unref_hook(hook_p hook); /* don't move this */
 142 #define _NG_HOOK_REF(hook)      atomic_add_int(&(hook)->hk_refs, 1)
 143 #define _NG_HOOK_NAME(hook)     ((hook)->hk_name)
 144 #define _NG_HOOK_UNREF(hook)    ng_unref_hook(hook)
 145 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
 146 #define _NG_HOOK_SET_RCVMSG(hook, val)  do {(hook)->hk_rcvmsg = val;} while (0)
 147 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
 148 #define _NG_HOOK_PRIVATE(hook)  ((hook)->hk_private)
 149 #define _NG_HOOK_NOT_VALID(hook)        ((hook)->hk_flags & HK_INVALID)
 150 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
 151 #define _NG_HOOK_NODE(hook)     ((hook)->hk_node) /* only rvalue! */
 152 #define _NG_HOOK_PEER(hook)     ((hook)->hk_peer) /* only rvalue! */
 153 #define _NG_HOOK_FORCE_WRITER(hook)                             \
 154                 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
 155 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
 156 #define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0)
 157
 158 /* Some shortcuts */
 159 #define NG_PEER_NODE(hook)      NG_HOOK_NODE(NG_HOOK_PEER(hook))
 160 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
 161 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
 162
 163 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 164 #define _NN_ __FILE__,__LINE__
 165 void    dumphook (hook_p hook, char *file, int line);
 166 static __inline void    _chkhook(hook_p hook, char *file, int line);
 167 static __inline void    _ng_hook_ref(hook_p hook, char * file, int line);
 168 static __inline char *  _ng_hook_name(hook_p hook, char * file, int line);
 169 static __inline void    _ng_hook_unref(hook_p hook, char * file, int line);
 170 static __inline void    _ng_hook_set_private(hook_p hook,
 171                                 void * val, char * file, int line);
 172 static __inline void    _ng_hook_set_rcvmsg(hook_p hook,
 173                                 ng_rcvmsg_t *val, char * file, int line);
 174 static __inline void    _ng_hook_set_rcvdata(hook_p hook,
 175                                 ng_rcvdata_t *val, char * file, int line);
 176 static __inline void *  _ng_hook_private(hook_p hook, char * file, int line);
 177 static __inline int     _ng_hook_not_valid(hook_p hook, char * file, int line);
 178 static __inline int     _ng_hook_is_valid(hook_p hook, char * file, int line);
 179 static __inline node_p  _ng_hook_node(hook_p hook, char * file, int line);
 180 static __inline hook_p  _ng_hook_peer(hook_p hook, char * file, int line);
 181 static __inline void    _ng_hook_force_writer(hook_p hook, char * file,
 182                                         int line);
 183 static __inline void    _ng_hook_force_queue(hook_p hook, char * file, int line);
 184
 185 static __inline void
 186 _chkhook(hook_p hook, char *file, int line)
 187 {
 188         if (hook->hk_magic != HK_MAGIC) {
 189                 kprintf("Accessing freed hook ");
 190                 dumphook(hook, file, line);
 191         }
 192         hook->lastline = line;
 193         hook->lastfile = file;
 194 }
 195
 196 static __inline void
 197 _ng_hook_ref(hook_p hook, char * file, int line)
 198 {
 199         _chkhook(hook, file, line);
 200         _NG_HOOK_REF(hook);
 201 }
 202
 203 static __inline char *
 204 _ng_hook_name(hook_p hook, char * file, int line)
 205 {
 206         _chkhook(hook, file, line);
 207         return (_NG_HOOK_NAME(hook));
 208 }
 209
 210 static __inline void
 211 _ng_hook_unref(hook_p hook, char * file, int line)
 212 {
 213         _chkhook(hook, file, line);
 214         _NG_HOOK_UNREF(hook);
 215 }
 216
 217 static __inline void
 218 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
 219 {
 220         _chkhook(hook, file, line);
 221         _NG_HOOK_SET_PRIVATE(hook, val);
 222 }
 223
 224 static __inline void
 225 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
 226 {
 227         _chkhook(hook, file, line);
 228         _NG_HOOK_SET_RCVMSG(hook, val);
 229 }
 230
 231 static __inline void
 232 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
 233 {
 234         _chkhook(hook, file, line);
 235         _NG_HOOK_SET_RCVDATA(hook, val);
 236 }
 237
 238 static __inline void *
 239 _ng_hook_private(hook_p hook, char * file, int line)
 240 {
 241         _chkhook(hook, file, line);
 242         return (_NG_HOOK_PRIVATE(hook));
 243 }
 244
 245 static __inline int
 246 _ng_hook_not_valid(hook_p hook, char * file, int line)
 247 {
 248         _chkhook(hook, file, line);
 249         return (_NG_HOOK_NOT_VALID(hook));
 250 }
 251
 252 static __inline int
 253 _ng_hook_is_valid(hook_p hook, char * file, int line)
 254 {
 255         _chkhook(hook, file, line);
 256         return (_NG_HOOK_IS_VALID(hook));
 257 }
 258
 259 static __inline node_p
 260 _ng_hook_node(hook_p hook, char * file, int line)
 261 {
 262         _chkhook(hook, file, line);
 263         return (_NG_HOOK_NODE(hook));
 264 }
 265
 266 static __inline hook_p
 267 _ng_hook_peer(hook_p hook, char * file, int line)
 268 {
 269         _chkhook(hook, file, line);
 270         return (_NG_HOOK_PEER(hook));
 271 }
 272
 273 static __inline void
 274 _ng_hook_force_writer(hook_p hook, char * file, int line)
 275 {
 276         _chkhook(hook, file, line);
 277         _NG_HOOK_FORCE_WRITER(hook);
 278 }
 279
 280 static __inline void
 281 _ng_hook_force_queue(hook_p hook, char * file, int line)
 282 {
 283         _chkhook(hook, file, line);
 284         _NG_HOOK_FORCE_QUEUE(hook);
 285 }
 286
 287 static __inline void
 288 _ng_hook_hi_stack(hook_p hook, char * file, int line)
 289 {
 290         _chkhook(hook, file, line);
 291         _NG_HOOK_HI_STACK(hook);
 292 }
 293
 294
 295 #define NG_HOOK_REF(hook)               _ng_hook_ref(hook, _NN_)
 296 #define NG_HOOK_NAME(hook)              _ng_hook_name(hook, _NN_)
 297 #define NG_HOOK_UNREF(hook)             _ng_hook_unref(hook, _NN_)
 298 #define NG_HOOK_SET_PRIVATE(hook, val)  _ng_hook_set_private(hook, val, _NN_)
 299 #define NG_HOOK_SET_RCVMSG(hook, val)   _ng_hook_set_rcvmsg(hook, val, _NN_)
 300 #define NG_HOOK_SET_RCVDATA(hook, val)  _ng_hook_set_rcvdata(hook, val, _NN_)
 301 #define NG_HOOK_PRIVATE(hook)           _ng_hook_private(hook, _NN_)
 302 #define NG_HOOK_NOT_VALID(hook)         _ng_hook_not_valid(hook, _NN_)
 303 #define NG_HOOK_IS_VALID(hook)          _ng_hook_is_valid(hook, _NN_)
 304 #define NG_HOOK_NODE(hook)              _ng_hook_node(hook, _NN_)
 305 #define NG_HOOK_PEER(hook)              _ng_hook_peer(hook, _NN_)
 306 #define NG_HOOK_FORCE_WRITER(hook)      _ng_hook_force_writer(hook, _NN_)
 307 #define NG_HOOK_FORCE_QUEUE(hook)       _ng_hook_force_queue(hook, _NN_)
 308 #define NG_HOOK_HI_STACK(hook)          _ng_hook_hi_stack(hook, _NN_)
 309
 310 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 311
 312 #define NG_HOOK_REF(hook)               _NG_HOOK_REF(hook)
 313 #define NG_HOOK_NAME(hook)              _NG_HOOK_NAME(hook)
 314 #define NG_HOOK_UNREF(hook)             _NG_HOOK_UNREF(hook)
 315 #define NG_HOOK_SET_PRIVATE(hook, val)  _NG_HOOK_SET_PRIVATE(hook, val)
 316 #define NG_HOOK_SET_RCVMSG(hook, val)   _NG_HOOK_SET_RCVMSG(hook, val)
 317 #define NG_HOOK_SET_RCVDATA(hook, val)  _NG_HOOK_SET_RCVDATA(hook, val)
 318 #define NG_HOOK_PRIVATE(hook)           _NG_HOOK_PRIVATE(hook)
 319 #define NG_HOOK_NOT_VALID(hook)         _NG_HOOK_NOT_VALID(hook)
 320 #define NG_HOOK_IS_VALID(hook)          _NG_HOOK_IS_VALID(hook)
 321 #define NG_HOOK_NODE(hook)              _NG_HOOK_NODE(hook)
 322 #define NG_HOOK_PEER(hook)              _NG_HOOK_PEER(hook)
 323 #define NG_HOOK_FORCE_WRITER(hook)      _NG_HOOK_FORCE_WRITER(hook)
 324 #define NG_HOOK_FORCE_QUEUE(hook)       _NG_HOOK_FORCE_QUEUE(hook)
 325 #define NG_HOOK_HI_STACK(hook)          _NG_HOOK_HI_STACK(hook)
 326
 327 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 328
 329 /***********************************************************************
 330  ***************** Node Structure and Methods **************************
 331  ***********************************************************************
 332  * Structure of a node
 333  */
 334 struct ng_node {
 335         char    nd_name[NG_NODESIZ];    /* optional globally unique name */
 336         struct  ng_type *nd_type;       /* the installed 'type' */
 337         int     nd_flags;               /* see below for bit definitions */
 338         int     nd_numhooks;            /* number of hooks */
 339         void   *nd_private;             /* node type dependant node ID */
 340         ng_ID_t nd_ID;                  /* Unique per node */
 341         LIST_HEAD(hooks, ng_hook) nd_hooks;     /* linked list of node hooks */
 342         LIST_ENTRY(ng_node)       nd_nodes;     /* name hash collision list */
 343         LIST_ENTRY(ng_node)       nd_idnodes;   /* ID hash collision list */
 344         struct  lwkt_token        nd_token;
 345         int     nd_refs;                /* # of references to this node */
 346 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 347 #define ND_MAGIC 0x59264837
 348         int     nd_magic;
 349         char    *lastfile;
 350         int     lastline;
 351         SLIST_ENTRY(ng_node)      nd_all;       /* all existing nodes */
 352 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 353 };
 354
 355 /* Flags for a node */
 356 #define NGF_INVALID     0x00000001      /* free when refs go to 0 */
 357 #define NG_INVALID      NGF_INVALID     /* compat for old code */
 358 #define NGF_FORCE_WRITER        0x00000004      /* Never multithread this node */
 359 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
 360 #define NGF_CLOSING     0x00000008      /* ng_rmnode() at work */
 361 #define NG_CLOSING      NGF_CLOSING     /* compat for old code */
 362 #define NGF_REALLY_DIE  0x00000010      /* "persistent" node is unloading */
 363 #define NG_REALLY_DIE   NGF_REALLY_DIE  /* compat for old code */
 364 #define NGF_HI_STACK    0x00000020      /* node has hi stack usage */
 365 #define NGF_TYPE1       0x10000000      /* reserved for type specific storage */
 366 #define NGF_TYPE2       0x20000000      /* reserved for type specific storage */
 367 #define NGF_TYPE3       0x40000000      /* reserved for type specific storage */
 368 #define NGF_TYPE4       0x80000000      /* reserved for type specific storage */
 369
 370 /*
 371  * Public methods for nodes.
 372  * If you can't do it with these you probably shouldn't be doing it.
 373  */
 374 void    ng_unref_node(node_p node); /* don't move this */
 375 #define _NG_NODE_NAME(node)     ((node)->nd_name + 0)
 376 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
 377 #define _NG_NODE_ID(node)       ((node)->nd_ID + 0)
 378 #define _NG_NODE_REF(node)      atomic_add_int(&(node)->nd_refs, 1)
 379 #define _NG_NODE_UNREF(node)    ng_unref_node(node)
 380 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
 381 #define _NG_NODE_PRIVATE(node)  ((node)->nd_private)
 382 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
 383 #define _NG_NODE_NOT_VALID(node)        ((node)->nd_flags & NGF_INVALID)
 384 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
 385 #define _NG_NODE_FORCE_WRITER(node)                                     \
 386         do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
 387 #define _NG_NODE_HI_STACK(node)                                         \
 388         do{ node->nd_flags |= NGF_HI_STACK; }while (0)
 389 #define _NG_NODE_REALLY_DIE(node)                                       \
 390         do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
 391 #define _NG_NODE_REVIVE(node) \
 392         do { node->nd_flags &= ~NGF_INVALID; } while (0)
 393 /*
 394  * The hook iterator.
 395  * This macro will call a function of type ng_fn_eachhook for each
 396  * hook attached to the node. If the function returns 0, then the
 397  * iterator will stop and return a pointer to the hook that returned 0.
 398  */
 399 typedef int     ng_fn_eachhook(hook_p hook, void* arg);
 400 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                   \
 401         do {                                                            \
 402                 hook_p _hook;                                           \
 403                 (rethook) = NULL;                                       \
 404                 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) {    \
 405                         if ((fn)(_hook, arg) == 0) {                    \
 406                                 (rethook) = _hook;                      \
 407                                 break;                                  \
 408                         }                                               \
 409                 }                                                       \
 410         } while (0)
 411
 412 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 413 void    dumpnode(node_p node, char *file, int line);
 414 static __inline void _chknode(node_p node, char *file, int line);
 415 static __inline char * _ng_node_name(node_p node, char *file, int line);
 416 static __inline int _ng_node_has_name(node_p node, char *file, int line);
 417 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
 418 static __inline void _ng_node_ref(node_p node, char *file, int line);
 419 static __inline int _ng_node_unref(node_p node, char *file, int line);
 420 static __inline void _ng_node_set_private(node_p node, void * val,
 421                                                         char *file, int line);
 422 static __inline void * _ng_node_private(node_p node, char *file, int line);
 423 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
 424 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
 425 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
 426 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
 427 static __inline hook_p _ng_node_foreach_hook(node_p node,
 428                         ng_fn_eachhook *fn, void *arg, char *file, int line);
 429 static __inline void _ng_node_revive(node_p node, char *file, int line);
 430
 431 static __inline void
 432 _chknode(node_p node, char *file, int line)
 433 {
 434         if (node->nd_magic != ND_MAGIC) {
 435                 kprintf("Accessing freed node ");
 436                 dumpnode(node, file, line);
 437         }
 438         node->lastline = line;
 439         node->lastfile = file;
 440 }
 441
 442 static __inline char *
 443 _ng_node_name(node_p node, char *file, int line)
 444 {
 445         _chknode(node, file, line);
 446         return(_NG_NODE_NAME(node));
 447 }
 448
 449 static __inline int
 450 _ng_node_has_name(node_p node, char *file, int line)
 451 {
 452         _chknode(node, file, line);
 453         return(_NG_NODE_HAS_NAME(node));
 454 }
 455
 456 static __inline ng_ID_t
 457 _ng_node_id(node_p node, char *file, int line)
 458 {
 459         _chknode(node, file, line);
 460         return(_NG_NODE_ID(node));
 461 }
 462
 463 static __inline void
 464 _ng_node_ref(node_p node, char *file, int line)
 465 {
 466         _chknode(node, file, line);
 467         _NG_NODE_REF(node);
 468 }
 469
 470 static __inline int
 471 _ng_node_unref(node_p node, char *file, int line)
 472 {
 473         _chknode(node, file, line);
 474         return (_NG_NODE_UNREF(node));
 475 }
 476
 477 static __inline void
 478 _ng_node_set_private(node_p node, void * val, char *file, int line)
 479 {
 480         _chknode(node, file, line);
 481         _NG_NODE_SET_PRIVATE(node, val);
 482 }
 483
 484 static __inline void *
 485 _ng_node_private(node_p node, char *file, int line)
 486 {
 487         _chknode(node, file, line);
 488         return (_NG_NODE_PRIVATE(node));
 489 }
 490
 491 static __inline int
 492 _ng_node_is_valid(node_p node, char *file, int line)
 493 {
 494         _chknode(node, file, line);
 495         return(_NG_NODE_IS_VALID(node));
 496 }
 497
 498 static __inline int
 499 _ng_node_not_valid(node_p node, char *file, int line)
 500 {
 501         _chknode(node, file, line);
 502         return(_NG_NODE_NOT_VALID(node));
 503 }
 504
 505 static __inline int
 506 _ng_node_numhooks(node_p node, char *file, int line)
 507 {
 508         _chknode(node, file, line);
 509         return(_NG_NODE_NUMHOOKS(node));
 510 }
 511
 512 static __inline void
 513 _ng_node_force_writer(node_p node, char *file, int line)
 514 {
 515         _chknode(node, file, line);
 516         _NG_NODE_FORCE_WRITER(node);
 517 }
 518
 519 static __inline void
 520 _ng_node_hi_stack(node_p node, char *file, int line)
 521 {
 522         _chknode(node, file, line);
 523         _NG_NODE_HI_STACK(node);
 524 }
 525
 526 static __inline void
 527 _ng_node_really_die(node_p node, char *file, int line)
 528 {
 529         _chknode(node, file, line);
 530         _NG_NODE_REALLY_DIE(node);
 531 }
 532
 533 static __inline void
 534 _ng_node_revive(node_p node, char *file, int line)
 535 {
 536         _chknode(node, file, line);
 537         _NG_NODE_REVIVE(node);
 538 }
 539
 540 static __inline hook_p
 541 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
 542                                                 char *file, int line)
 543 {
 544         hook_p hook;
 545         _chknode(node, file, line);
 546         _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
 547         return (hook);
 548 }
 549
 550 #define NG_NODE_NAME(node)              _ng_node_name(node, _NN_)
 551 #define NG_NODE_HAS_NAME(node)          _ng_node_has_name(node, _NN_)
 552 #define NG_NODE_ID(node)                _ng_node_id(node, _NN_)
 553 #define NG_NODE_REF(node)               _ng_node_ref(node, _NN_)
 554 #define NG_NODE_UNREF(node)             _ng_node_unref(node, _NN_)
 555 #define NG_NODE_SET_PRIVATE(node, val)  _ng_node_set_private(node, val, _NN_)
 556 #define NG_NODE_PRIVATE(node)           _ng_node_private(node, _NN_)
 557 #define NG_NODE_IS_VALID(node)          _ng_node_is_valid(node, _NN_)
 558 #define NG_NODE_NOT_VALID(node)         _ng_node_not_valid(node, _NN_)
 559 #define NG_NODE_FORCE_WRITER(node)      _ng_node_force_writer(node, _NN_)
 560 #define NG_NODE_HI_STACK(node)          _ng_node_hi_stack(node, _NN_)
 561 #define NG_NODE_REALLY_DIE(node)        _ng_node_really_die(node, _NN_)
 562 #define NG_NODE_NUMHOOKS(node)          _ng_node_numhooks(node, _NN_)
 563 #define NG_NODE_REVIVE(node)            _ng_node_revive(node, _NN_)
 564 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                          \
 565         do {                                                                  \
 566                 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
 567         } while (0)
 568
 569 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 570
 571 #define NG_NODE_NAME(node)              _NG_NODE_NAME(node)
 572 #define NG_NODE_HAS_NAME(node)          _NG_NODE_HAS_NAME(node)
 573 #define NG_NODE_ID(node)                _NG_NODE_ID(node)
 574 #define NG_NODE_REF(node)               _NG_NODE_REF(node)
 575 #define NG_NODE_UNREF(node)             _NG_NODE_UNREF(node)
 576 #define NG_NODE_SET_PRIVATE(node, val)  _NG_NODE_SET_PRIVATE(node, val)
 577 #define NG_NODE_PRIVATE(node)           _NG_NODE_PRIVATE(node)
 578 #define NG_NODE_IS_VALID(node)          _NG_NODE_IS_VALID(node)
 579 #define NG_NODE_NOT_VALID(node)         _NG_NODE_NOT_VALID(node)
 580 #define NG_NODE_FORCE_WRITER(node)      _NG_NODE_FORCE_WRITER(node)
 581 #define NG_NODE_HI_STACK(node)          _NG_NODE_HI_STACK(node)
 582 #define NG_NODE_REALLY_DIE(node)        _NG_NODE_REALLY_DIE(node)
 583 #define NG_NODE_NUMHOOKS(node)          _NG_NODE_NUMHOOKS(node)
 584 #define NG_NODE_REVIVE(node)            _NG_NODE_REVIVE(node)
 585 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                    \
 586                 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
 587 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 588
 589 /***********************************************************************
 590  ************* Node Queue and Item Structures and Methods **************
 591  ***********************************************************************
 592  *
 593  */
 594 typedef void    ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
 595 typedef int     ng_item_fn2(node_p node, struct ng_item *item, hook_p hook);
 596 typedef void    ng_apply_t(void *context, int error);
 597 struct ng_apply_info {
 598         ng_apply_t      *apply;
 599         void            *context;
 600 };
 601 struct ng_item {
 602         struct lwkt_msg         el_lmsg;
 603         u_long  el_flags;
 604         STAILQ_ENTRY(ng_item)   el_next;
 605         node_p  el_dest; /* The node it will be applied against (or NULL) */
 606         hook_p  el_hook; /* Entering hook. Optional in Control messages */
 607         union {
 608                 struct mbuf     *da_m;
 609                 struct {
 610                         struct ng_mesg  *msg_msg;
 611                         ng_ID_t         msg_retaddr;
 612                 } msg;
 613                 struct {
 614                         union {
 615                                 ng_item_fn      *fn_fn;
 616                                 ng_item_fn2     *fn_fn2;
 617                         } fn_fn;
 618                         void            *fn_arg1;
 619                         int             fn_arg2;
 620                 } fn;
 621         } body;
 622         /*
 623          * Optional callback called when item is being applied,
 624          * and its context.
 625          */
 626         struct ng_apply_info    *apply;
 627         u_int   refs;
 628 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 629         char *lastfile;
 630         int  lastline;
 631         TAILQ_ENTRY(ng_item)      all;          /* all existing items */
 632 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 633 };
 634
 635 #define NGQF_TYPE       0x03            /* MASK of content definition */
 636 #define NGQF_MESG       0x00            /* the queue element is a message */
 637 #define NGQF_DATA       0x01            /* the queue element is data */
 638 #define NGQF_FN         0x02            /* the queue element is a function */
 639 #define NGQF_FN2        0x03            /* the queue element is a new function */
 640
 641 #define NGQF_RW         0x04            /* MASK for wanted queue mode */
 642 #define NGQF_READER     0x04            /* wants to be a reader */
 643 #define NGQF_WRITER     0x00            /* wants to be a writer */
 644
 645 #define NGQF_QMODE      0x08            /* MASK for how it was queued */
 646 #define NGQF_QREADER    0x08            /* was queued as a reader */
 647 #define NGQF_QWRITER    0x00            /* was queued as a writer */
 648
 649 #define NGQF_FREE       0x10            /* mark for freeing */
 650
 651 /*
 652  * Get the mbuf (etc) out of an item.
 653  * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
 654  * with it, (to avoid freeing the things twice).
 655  * If you don't want to zero out the item then realise that the
 656  * item still owns it.
 657  * Retaddr is different. There are no references on that. It's just a number.
 658  * The debug versions must be either all used everywhere or not at all.
 659  */
 660
 661 #define _NGI_M(i) ((i)->body.da_m)
 662 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
 663 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
 664 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn)
 665 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2)
 666 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
 667 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
 668 #define _NGI_NODE(i) ((i)->el_dest)
 669 #define _NGI_HOOK(i) ((i)->el_hook)
 670 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
 671 #define _NGI_CLR_HOOK(i)   do {                                         \
 672                 hook_p _hook = _NGI_HOOK(i);                            \
 673                 if (_hook) {                                            \
 674                         _NG_HOOK_UNREF(_hook);                          \
 675                         _NGI_HOOK(i) = NULL;                            \
 676                 }                                                       \
 677         } while (0)
 678 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
 679 #define _NGI_CLR_NODE(i)   do {                                         \
 680                 node_p _node = _NGI_NODE(i);                            \
 681                 if (_node) {                                            \
 682                         _NG_NODE_UNREF(_node);                          \
 683                         _NGI_NODE(i) = NULL;                            \
 684                 }                                                       \
 685         } while (0)
 686
 687 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
 688 void                            dumpitem(item_p item, char *file, int line);
 689 static __inline void            _ngi_check(item_p item, char *file, int line) ;
 690 static __inline struct mbuf **  _ngi_m(item_p item, char *file, int line) ;
 691 static __inline ng_ID_t *       _ngi_retaddr(item_p item, char *file, int line);
 692 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
 693 static __inline ng_item_fn **   _ngi_fn(item_p item, char *file, int line) ;
 694 static __inline ng_item_fn2 **  _ngi_fn2(item_p item, char *file, int line) ;
 695 static __inline void **         _ngi_arg1(item_p item, char *file, int line) ;
 696 static __inline int *           _ngi_arg2(item_p item, char *file, int line) ;
 697 static __inline node_p          _ngi_node(item_p item, char *file, int line);
 698 static __inline hook_p          _ngi_hook(item_p item, char *file, int line);
 699
 700 static __inline void
 701 _ngi_check(item_p item, char *file, int line)
 702 {
 703         (item)->lastline = line;
 704         (item)->lastfile = file;
 705 }
 706
 707 static __inline struct mbuf **
 708 _ngi_m(item_p item, char *file, int line)
 709 {
 710         _ngi_check(item, file, line);
 711         return (&_NGI_M(item));
 712 }
 713
 714 static __inline struct ng_mesg **
 715 _ngi_msg(item_p item, char *file, int line)
 716 {
 717         _ngi_check(item, file, line);
 718         return (&_NGI_MSG(item));
 719 }
 720
 721 static __inline ng_ID_t *
 722 _ngi_retaddr(item_p item, char *file, int line)
 723 {
 724         _ngi_check(item, file, line);
 725         return (&_NGI_RETADDR(item));
 726 }
 727
 728 static __inline ng_item_fn **
 729 _ngi_fn(item_p item, char *file, int line)
 730 {
 731         _ngi_check(item, file, line);
 732         return (&_NGI_FN(item));
 733 }
 734
 735 static __inline ng_item_fn2 **
 736 _ngi_fn2(item_p item, char *file, int line)
 737 {
 738         _ngi_check(item, file, line);
 739         return (&_NGI_FN2(item));
 740 }
 741
 742 static __inline void **
 743 _ngi_arg1(item_p item, char *file, int line)
 744 {
 745         _ngi_check(item, file, line);
 746         return (&_NGI_ARG1(item));
 747 }
 748
 749 static __inline int *
 750 _ngi_arg2(item_p item, char *file, int line)
 751 {
 752         _ngi_check(item, file, line);
 753         return (&_NGI_ARG2(item));
 754 }
 755
 756 static __inline node_p
 757 _ngi_node(item_p item, char *file, int line)
 758 {
 759         _ngi_check(item, file, line);
 760         return (_NGI_NODE(item));
 761 }
 762
 763 static __inline hook_p
 764 _ngi_hook(item_p item, char *file, int line)
 765 {
 766         _ngi_check(item, file, line);
 767         return (_NGI_HOOK(item));
 768 }
 769
 770 #define NGI_M(i)        (*_ngi_m(i, _NN_))
 771 #define NGI_MSG(i)      (*_ngi_msg(i, _NN_))
 772 #define NGI_RETADDR(i)  (*_ngi_retaddr(i, _NN_))
 773 #define NGI_FN(i)       (*_ngi_fn(i, _NN_))
 774 #define NGI_FN2(i)      (*_ngi_fn2(i, _NN_))
 775 #define NGI_ARG1(i)     (*_ngi_arg1(i, _NN_))
 776 #define NGI_ARG2(i)     (*_ngi_arg2(i, _NN_))
 777 #define NGI_HOOK(i)     _ngi_hook(i, _NN_)
 778 #define NGI_NODE(i)     _ngi_node(i, _NN_)
 779 #define NGI_SET_HOOK(i,h)                                               \
 780         do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
 781 #define NGI_CLR_HOOK(i)                                                 \
 782         do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
 783 #define NGI_SET_NODE(i,n)                                               \
 784         do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
 785 #define NGI_CLR_NODE(i)                                                 \
 786         do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
 787
 788 #define NG_FREE_ITEM(item)                                              \
 789         do {                                                            \
 790                 _ngi_check(item, _NN_);                                 \
 791                 item->el_flags |= NGQF_FREE;                            \
 792                 item = NULL;                                            \
 793         } while (0)
 794
 795 #define SAVE_LINE(item)                                                 \
 796         do {                                                            \
 797                 (item)->lastline = __LINE__;                            \
 798                 (item)->lastfile = __FILE__;                            \
 799         } while (0)
 800
 801 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 802
 803 #define NGI_M(i)        _NGI_M(i)
 804 #define NGI_MSG(i)      _NGI_MSG(i)
 805 #define NGI_RETADDR(i)  _NGI_RETADDR(i)
 806 #define NGI_FN(i)       _NGI_FN(i)
 807 #define NGI_FN2(i)      _NGI_FN2(i)
 808 #define NGI_ARG1(i)     _NGI_ARG1(i)
 809 #define NGI_ARG2(i)     _NGI_ARG2(i)
 810 #define NGI_NODE(i)     _NGI_NODE(i)
 811 #define NGI_HOOK(i)     _NGI_HOOK(i)
 812 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
 813 #define NGI_CLR_HOOK(i)   _NGI_CLR_HOOK(i)
 814 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
 815 #define NGI_CLR_NODE(i)   _NGI_CLR_NODE(i)
 816
 817 #define NG_FREE_ITEM(item)                                              \
 818         do {                                                            \
 819                 KKASSERT(!(item->el_flags & NGQF_FREE));                \
 820                 item->el_flags |= NGQF_FREE;                            \
 821         } while (0)
 822 #define SAVE_LINE(item)         do {} while (0)
 823
 824 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 825
 826 #define NGI_GET_M(i,m)                                                  \
 827         do {                                                            \
 828                 (m) = NGI_M(i);                                         \
 829                 _NGI_M(i) = NULL;                                       \
 830         } while (0)
 831
 832 #define NGI_GET_MSG(i,m)                                                \
 833         do {                                                            \
 834                 (m) = NGI_MSG(i);                                       \
 835                 _NGI_MSG(i) = NULL;                                     \
 836         } while (0)
 837
 838 #define NGI_GET_NODE(i,n)       /* YOU NOW HAVE THE REFERENCE */        \
 839         do {                                                            \
 840                 (n) = NGI_NODE(i);                                      \
 841                 _NGI_NODE(i) = NULL;                                    \
 842         } while (0)
 843
 844 #define NGI_GET_HOOK(i,h)                                               \
 845         do {                                                            \
 846                 (h) = NGI_HOOK(i);                                      \
 847                 _NGI_HOOK(i) = NULL;                                    \
 848         } while (0)
 849
 850 #define NGI_SET_WRITER(i)       ((i)->el_flags &= ~NGQF_QMODE)
 851 #define NGI_SET_READER(i)       ((i)->el_flags |= NGQF_QREADER)
 852
 853 #define NGI_QUEUED_READER(i)    ((i)->el_flags & NGQF_QREADER)
 854 #define NGI_QUEUED_WRITER(i)    (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
 855
 856 /**********************************************************************
 857 * Data macros.  Send, manipulate and free.
 858 **********************************************************************/
 859 /*
 860  * Assuming the data is already ok, just set the new address and send
 861  */
 862 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags)                \
 863         do {                                                            \
 864                 (error) =                                               \
 865                     ng_address_hook(NULL, (item), (hook), NG_NOFLAGS);  \
 866                 if (error == 0) {                                       \
 867                         SAVE_LINE(item);                                \
 868                         (error) = ng_snd_item((item), (flags));         \
 869                 }                                                       \
 870                 (item) = NULL;                                          \
 871         } while (0)
 872 #define NG_FWD_ITEM_HOOK(error, item, hook)     \
 873                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
 874
 875 /*
 876  * Forward a data packet. Mbuf pointer is updated to new value. We
 877  * presume you dealt with the old one when you update it to the new one
 878  * (or it maybe the old one). We got a packet and possibly had to modify
 879  * the mbuf. You should probably use NGI_GET_M() if you are going to use
 880  * this too.
 881  */
 882 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags)              \
 883         do {                                                            \
 884                 NGI_M(item) = (m);                                      \
 885                 (m) = NULL;                                             \
 886                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags);       \
 887         } while (0)
 888 #define NG_FWD_NEW_DATA(error, item, hook, m)   \
 889                 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
 890
 891 /* Send a previously unpackaged mbuf. XXX: This should be called
 892  * NG_SEND_DATA in future, but this name is kept for compatibility
 893  * reasons.
 894  */
 895 #define NG_SEND_DATA_FLAGS(error, hook, m, flags)                       \
 896         do {                                                            \
 897                 item_p _item;                                           \
 898                 if ((_item = ng_package_data((m), flags))) {            \
 899                         NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
 900                 } else {                                                \
 901                         (error) = ENOMEM;                               \
 902                 }                                                       \
 903                 (m) = NULL;                                             \
 904         } while (0)
 905
 906 #define NG_SEND_DATA_ONLY(error, hook, m)       \
 907                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
 908 /* NG_SEND_DATA() compat for meta-data times */
 909 #define NG_SEND_DATA(error, hook, m, x) \
 910                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
 911
 912 #define NG_FREE_MSG(msg)                                                \
 913         do {                                                            \
 914                 if ((msg)) {                                            \
 915                         kfree((msg), M_NETGRAPH_MSG);                   \
 916                         (msg) = NULL;                                   \
 917                 }                                                       \
 918         } while (0)
 919
 920 #define NG_FREE_M(m)                                                    \
 921         do {                                                            \
 922                 if ((m)) {                                              \
 923                         m_freem((m));                                   \
 924                         (m) = NULL;                                     \
 925                 }                                                       \
 926         } while (0)
 927
 928 /*****************************************
 929 * Message macros
 930 *****************************************/
 931
 932 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr)               \
 933         do {                                                            \
 934                 item_p _item;                                           \
 935                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 936                         (msg) = NULL;                                   \
 937                         (error) = ENOMEM;                               \
 938                         break;                                          \
 939                 }                                                       \
 940                 if (((error) = ng_address_hook((here), (_item),         \
 941                                         (hook), (retaddr))) == 0) {     \
 942                         SAVE_LINE(_item);                               \
 943                         (error) = ng_snd_item((_item), 0);              \
 944                 }                                                       \
 945                 (msg) = NULL;                                           \
 946         } while (0)
 947
 948 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr)               \
 949         do {                                                            \
 950                 item_p _item;                                           \
 951                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 952                         (msg) = NULL;                                   \
 953                         (error) = ENOMEM;                               \
 954                         break;                                          \
 955                 }                                                       \
 956                 if (((error) = ng_address_path((here), (_item),         \
 957                                         (path), (retaddr))) == 0) {     \
 958                         SAVE_LINE(_item);                               \
 959                         (error) = ng_snd_item((_item), 0);              \
 960                 }                                                       \
 961                 (msg) = NULL;                                           \
 962         } while (0)
 963
 964 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr)                   \
 965         do {                                                            \
 966                 item_p _item;                                           \
 967                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 968                         (msg) = NULL;                                   \
 969                         (error) = ENOMEM;                               \
 970                         break;                                          \
 971                 }                                                       \
 972                 if (((error) = ng_address_ID((here), (_item),           \
 973                                         (ID), (retaddr))) == 0) {       \
 974                         SAVE_LINE(_item);                               \
 975                         (error) = ng_snd_item((_item), 0);              \
 976                 }                                                       \
 977                 (msg) = NULL;                                           \
 978         } while (0)
 979
 980 /*
 981  * Redirect the message to the next hop using the given hook.
 982  * ng_retarget_msg() frees the item if there is an error
 983  * and returns an error code.  It returns 0 on success.
 984  */
 985 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr)               \
 986         do {                                                            \
 987                 if (((error) = ng_address_hook((here), (item),          \
 988                                         (hook), (retaddr))) == 0) {     \
 989                         SAVE_LINE(item);                                \
 990                         (error) = ng_snd_item((item), 0);               \
 991                 }                                                       \
 992                 (item) = NULL;                                          \
 993         } while (0)
 994
 995 /*
 996  * Send a queue item back to it's originator with a response message.
 997  * Assume original message was removed and freed separatly.
 998  */
 999 #define NG_RESPOND_MSG(error, here, item, resp)                         \
1000         do {                                                            \
1001                 if (resp) {                                             \
1002                         ng_ID_t _dest = NGI_RETADDR(item);              \
1003                         NGI_RETADDR(item) = 0;                          \
1004                         NGI_MSG(item) = resp;                           \
1005                         if ((error = ng_address_ID((here), (item),      \
1006                                         _dest, 0)) == 0) {              \
1007                                 SAVE_LINE(item);                        \
1008                                 (error) = ng_snd_item((item), NG_QUEUE);\
1009                         }                                               \
1010                 } else {                                                \
1011                         NG_FREE_ITEM(item);                             \
1012                 }                                                       \
1013                 (item) = NULL;                                          \
1014         } while (0)
1015
1016
1017 /***********************************************************************
1018  ******** Structures Definitions and Macros for defining a node  *******
1019  ***********************************************************************
1020  *
1021  * Here we define the structures needed to actually define a new node
1022  * type.
1023  */
1024
1025 /*
1026  * Command list -- each node type specifies the command that it knows
1027  * how to convert between ASCII and binary using an array of these.
1028  * The last element in the array must be a terminator with cookie=0.
1029  */
1030
1031 struct ng_cmdlist {
1032         u_int32_t                       cookie;         /* command typecookie */
1033         int                             cmd;            /* command number */
1034         const char                      *name;          /* command name */
1035         const struct ng_parse_type      *mesgType;      /* args if !NGF_RESP */
1036         const struct ng_parse_type      *respType;      /* args if NGF_RESP */
1037 };
1038
1039 /*
1040  * Structure of a node type
1041  * If data is sent to the "rcvdata()" entrypoint then the system
1042  * may decide to defer it until later by queing it with the normal netgraph
1043  * input queuing system.  This is decidde by the HK_QUEUE flag being set in
1044  * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1045  * ensure it is not requeued again.
1046  * Note the input queueing system is to allow modules
1047  * to 'release the stack' or to pass data across spl layers.
1048  * The data will be redelivered as soon as the NETISR code runs
1049  * which may be almost immediatly.  A node may also do it's own queueing
1050  * for other reasons (e.g. device output queuing).
1051  */
1052 struct ng_type {
1053
1054         u_int32_t       version;        /* must equal NG_API_VERSION */
1055         const char      *name;          /* Unique type name */
1056         modeventhand_t  mod_event;      /* Module event handler (optional) */
1057         ng_constructor_t *constructor;  /* Node constructor */
1058         ng_rcvmsg_t     *rcvmsg;        /* control messages come here */
1059         ng_close_t      *close;         /* warn about forthcoming shutdown */
1060         ng_shutdown_t   *shutdown;      /* reset, and free resources */
1061         ng_newhook_t    *newhook;       /* first notification of new hook */
1062         ng_findhook_t   *findhook;      /* only if you have lots of hooks */
1063         ng_connect_t    *connect;       /* final notification of new hook */
1064         ng_rcvdata_t    *rcvdata;       /* data comes here */
1065         ng_disconnect_t *disconnect;    /* notify on disconnect */
1066
1067         const struct    ng_cmdlist *cmdlist;    /* commands we can convert */
1068
1069         /* R/W data private to the base netgraph code DON'T TOUCH! */
1070         LIST_ENTRY(ng_type) types;              /* linked list of all types */
1071         int                 refs;               /* number of instances */
1072 };
1073
1074 /*
1075  * Use the NETGRAPH_INIT() macro to link a node type into the
1076  * netgraph system. This works for types compiled into the kernel
1077  * as well as KLD modules. The first argument should be the type
1078  * name (eg, echo) and the second a pointer to the type struct.
1079  *
1080  * If a different link time is desired, e.g., a device driver that
1081  * needs to install its netgraph type before probing, use the
1082  * NETGRAPH_INIT_ORDERED() macro instead.  Device drivers probably
1083  * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
1084  */
1085
1086 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order)        \
1087 static moduledata_t ng_##typename##_mod = {                             \
1088         "ng_" #typename,                                                \
1089         ng_mod_event,                                                   \
1090         (typestructp)                                                   \
1091 };                                                                      \
1092 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order);         \
1093 MODULE_DEPEND(ng_##typename, netgraph,  NG_ABI_VERSION,                 \
1094                                         NG_ABI_VERSION,                 \
1095                                         NG_ABI_VERSION)
1096
1097 #define NETGRAPH_INIT(tn, tp)                                           \
1098         NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1099
1100 /* Special malloc() type for netgraph structs and ctrl messages */
1101 /* Only these two types should be visible to nodes */
1102 MALLOC_DECLARE(M_NETGRAPH);
1103 MALLOC_DECLARE(M_NETGRAPH_MSG);
1104
1105 /* declare the base of the netgraph sysclt hierarchy */
1106 /* but only if this file cares about sysctls */
1107 #ifdef  SYSCTL_DECL
1108 SYSCTL_DECL(_net_graph);
1109 #endif
1110
1111 /*
1112  * Methods that the nodes can use.
1113  * Many of these methods should usually NOT be used directly but via
1114  * Macros above.
1115  */
1116 int     ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1117 int     ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1118 int     ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1119 int     ng_bypass(hook_p hook1, hook_p hook2);
1120 hook_p  ng_findhook(node_p node, const char *name);
1121 struct  ng_type *ng_findtype(const char *type);
1122 int     ng_make_node_common(struct ng_type *typep, node_p *nodep);
1123 int     ng_name_node(node_p node, const char *name);
1124 int     ng_newtype(struct ng_type *tp);
1125 ng_ID_t ng_node2ID(node_p node);
1126 item_p  ng_package_data(struct mbuf *m, int flags);
1127 item_p  ng_package_msg(struct ng_mesg *msg, int flags);
1128 item_p  ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1129 void    ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1130 int     ng_rmhook_self(hook_p hook);    /* if a node wants to kill a hook */
1131 int     ng_rmnode_self(node_p here);    /* if a node wants to suicide */
1132 int     ng_rmtype(struct ng_type *tp);
1133 int     ng_snd_item(item_p item, int queue);
1134 int     ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1135         int arg2);
1136 int     ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1137         int arg2, int flags);
1138 int     ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn,
1139         void *arg1, int arg2, int flags);
1140 int     ng_uncallout(struct callout *c, node_p node);
1141 int     ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
1142             ng_item_fn *fn, void * arg1, int arg2);
1143 #define ng_callout_init(c)      callout_init(c)
1144 apply_p ng_alloc_apply(void);
1145 void    ng_free_apply(apply_p apply);
1146
1147 /* Flags for netgraph functions. */
1148 #define NG_NOFLAGS      0x00000000      /* no special options */
1149 #define NG_QUEUE        0x00000001      /* enqueue item, don't dispatch */
1150 #define NG_WAITOK       0x00000002      /* use M_WAITOK, etc. */
1151 /* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */
1152 #define NG_PROGRESS     0x00000004      /* return EINPROGRESS if queued */
1153 #define NG_REUSE_ITEM   0x00000008      /* supplied item should be reused */
1154
1155 /*
1156  * prototypes the user should DEFINITELY not use directly
1157  */
1158 void    ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1159 int     ng_mod_event(module_t mod, int what, void *arg);
1160
1161 /*
1162  * Tag definitions and constants
1163  */
1164
1165 #define NG_TAG_PRIO     1
1166
1167 struct ng_tag_prio {
1168         struct m_tag    tag;
1169         char    priority;
1170         char    discardability;
1171 };
1172
1173 #define NG_PRIO_CUTOFF          32
1174 #define NG_PRIO_LINKSTATE       64
1175
1176 /* Macros and declarations to keep compatibility with metadata, which
1177  * is obsoleted now. To be deleted.
1178  */
1179 typedef void *meta_p;
1180 #define _NGI_META(i)    NULL
1181 #define NGI_META(i)     NULL
1182 #define NG_FREE_META(meta)
1183 #define NGI_GET_META(i,m)
1184 #define ng_copy_meta(meta) NULL
1185
1186 #endif /* _NETGRAPH_NETGRAPH_H_ */