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  * $DragonFly: src/sys/netgraph7/netgraph.h,v 1.2 2008/06/26 23:05:35 dillon Exp $
  42  * $Whistle: netgraph.h,v 1.29 1999/11/01 07:56:13 julian Exp $
  43  */
  44
  45 #ifndef _NETGRAPH_NETGRAPH_H_
  46 #define _NETGRAPH_NETGRAPH_H_
  47
  48 #ifndef _KERNEL
  49 #error "This file should not be included in user level programs"
  50 #endif
  51
  52 #include <sys/queue.h>
  53 #include <sys/lock.h>
  54 #include <sys/malloc.h>
  55 #include <sys/module.h>
  56 /*#include <sys/mutex.h>*/
  57 #include "dragonfly.h"
  58
  59 #ifdef HAVE_KERNEL_OPTION_HEADERS
  60 #include "opt_netgraph.h"
  61 #endif
  62
  63 /* debugging options */
  64 #define NG_SEPARATE_MALLOC      /* make modules use their own malloc types */
  65
  66 /*
  67  * This defines the in-kernel binary interface version.
  68  * It is possible to change this but leave the external message
  69  * API the same. Each type also has it's own cookies for versioning as well.
  70  * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
  71  * modules.
  72  */
  73 #define _NG_ABI_VERSION 12
  74 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  75 #define NG_ABI_VERSION  (_NG_ABI_VERSION + 0x10000)
  76 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  77 #define NG_ABI_VERSION  _NG_ABI_VERSION
  78 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  79
  80
  81 /*
  82  * Forward references for the basic structures so we can
  83  * define the typedefs and use them in the structures themselves.
  84  */
  85 struct ng_hook ;
  86 struct ng_node ;
  87 struct ng_item ;
  88 typedef struct ng_item *item_p;
  89 typedef struct ng_node *node_p;
  90 typedef struct ng_hook *hook_p;
  91
  92 /* node method definitions */
  93 typedef int     ng_constructor_t(node_p node);
  94 typedef int     ng_close_t(node_p node);
  95 typedef int     ng_shutdown_t(node_p node);
  96 typedef int     ng_newhook_t(node_p node, hook_p hook, const char *name);
  97 typedef hook_p  ng_findhook_t(node_p node, const char *name);
  98 typedef int     ng_connect_t(hook_p hook);
  99 typedef int     ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
 100 typedef int     ng_rcvdata_t(hook_p hook, item_p item);
 101 typedef int     ng_disconnect_t(hook_p hook);
 102 typedef int     ng_rcvitem (node_p node, hook_p hook, item_p item);
 103
 104 /***********************************************************************
 105  ***************** Hook Structure and Methods **************************
 106  ***********************************************************************
 107  *
 108  * Structure of a hook
 109  */
 110 struct ng_hook {
 111         char    hk_name[NG_HOOKSIZ];    /* what this node knows this link as */
 112         void   *hk_private;             /* node dependant ID for this hook */
 113         int     hk_flags;               /* info about this hook/link */
 114         int     hk_type;                /* tbd: hook data link type */
 115         struct  ng_hook *hk_peer;       /* the other end of this link */
 116         struct  ng_node *hk_node;       /* The node this hook is attached to */
 117         LIST_ENTRY(ng_hook) hk_hooks;   /* linked list of all hooks on node */
 118         ng_rcvmsg_t     *hk_rcvmsg;     /* control messages come here */
 119         ng_rcvdata_t    *hk_rcvdata;    /* data comes here */
 120         int     hk_refs;                /* dont actually free this till 0 */
 121 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 122 #define HK_MAGIC 0x78573011
 123         int     hk_magic;
 124         char    *lastfile;
 125         int     lastline;
 126         SLIST_ENTRY(ng_hook)      hk_all;               /* all existing items */
 127 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 128 };
 129 /* Flags for a hook */
 130 #define HK_INVALID              0x0001  /* don't trust it! */
 131 #define HK_QUEUE                0x0002  /* queue for later delivery */
 132 #define HK_FORCE_WRITER         0x0004  /* Incoming data queued as a writer */
 133 #define HK_DEAD                 0x0008  /* This is the dead hook.. don't free */
 134 #define HK_HI_STACK             0x0010  /* Hook has hi stack usage */
 135
 136 /*
 137  * Public Methods for hook
 138  * If you can't do it with these you probably shouldn;t be doing it.
 139  */
 140 void ng_unref_hook(hook_p hook); /* don't move this */
 141 #define _NG_HOOK_REF(hook)      atomic_add_int(&(hook)->hk_refs, 1)
 142 #define _NG_HOOK_NAME(hook)     ((hook)->hk_name)
 143 #define _NG_HOOK_UNREF(hook)    ng_unref_hook(hook)
 144 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
 145 #define _NG_HOOK_SET_RCVMSG(hook, val)  do {(hook)->hk_rcvmsg = val;} while (0)
 146 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
 147 #define _NG_HOOK_PRIVATE(hook)  ((hook)->hk_private)
 148 #define _NG_HOOK_NOT_VALID(hook)        ((hook)->hk_flags & HK_INVALID)
 149 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
 150 #define _NG_HOOK_NODE(hook)     ((hook)->hk_node) /* only rvalue! */
 151 #define _NG_HOOK_PEER(hook)     ((hook)->hk_peer) /* only rvalue! */
 152 #define _NG_HOOK_FORCE_WRITER(hook)                             \
 153                 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
 154 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
 155 #define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0)
 156
 157 /* Some shortcuts */
 158 #define NG_PEER_NODE(hook)      NG_HOOK_NODE(NG_HOOK_PEER(hook))
 159 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
 160 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
 161
 162 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 163 #define _NN_ __FILE__,__LINE__
 164 void    dumphook (hook_p hook, char *file, int line);
 165 static __inline void    _chkhook(hook_p hook, char *file, int line);
 166 static __inline void    _ng_hook_ref(hook_p hook, char * file, int line);
 167 static __inline char *  _ng_hook_name(hook_p hook, char * file, int line);
 168 static __inline void    _ng_hook_unref(hook_p hook, char * file, int line);
 169 static __inline void    _ng_hook_set_private(hook_p hook,
 170                                 void * val, char * file, int line);
 171 static __inline void    _ng_hook_set_rcvmsg(hook_p hook,
 172                                 ng_rcvmsg_t *val, char * file, int line);
 173 static __inline void    _ng_hook_set_rcvdata(hook_p hook,
 174                                 ng_rcvdata_t *val, char * file, int line);
 175 static __inline void *  _ng_hook_private(hook_p hook, char * file, int line);
 176 static __inline int     _ng_hook_not_valid(hook_p hook, char * file, int line);
 177 static __inline int     _ng_hook_is_valid(hook_p hook, char * file, int line);
 178 static __inline node_p  _ng_hook_node(hook_p hook, char * file, int line);
 179 static __inline hook_p  _ng_hook_peer(hook_p hook, char * file, int line);
 180 static __inline void    _ng_hook_force_writer(hook_p hook, char * file,
 181                                         int line);
 182 static __inline void    _ng_hook_force_queue(hook_p hook, char * file, int line);
 183
 184 static __inline void
 185 _chkhook(hook_p hook, char *file, int line)
 186 {
 187         if (hook->hk_magic != HK_MAGIC) {
 188                 printf("Accessing freed hook ");
 189                 dumphook(hook, file, line);
 190         }
 191         hook->lastline = line;
 192         hook->lastfile = file;
 193 }
 194
 195 static __inline void
 196 _ng_hook_ref(hook_p hook, char * file, int line)
 197 {
 198         _chkhook(hook, file, line);
 199         _NG_HOOK_REF(hook);
 200 }
 201
 202 static __inline char *
 203 _ng_hook_name(hook_p hook, char * file, int line)
 204 {
 205         _chkhook(hook, file, line);
 206         return (_NG_HOOK_NAME(hook));
 207 }
 208
 209 static __inline void
 210 _ng_hook_unref(hook_p hook, char * file, int line)
 211 {
 212         _chkhook(hook, file, line);
 213         _NG_HOOK_UNREF(hook);
 214 }
 215
 216 static __inline void
 217 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
 218 {
 219         _chkhook(hook, file, line);
 220         _NG_HOOK_SET_PRIVATE(hook, val);
 221 }
 222
 223 static __inline void
 224 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
 225 {
 226         _chkhook(hook, file, line);
 227         _NG_HOOK_SET_RCVMSG(hook, val);
 228 }
 229
 230 static __inline void
 231 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
 232 {
 233         _chkhook(hook, file, line);
 234         _NG_HOOK_SET_RCVDATA(hook, val);
 235 }
 236
 237 static __inline void *
 238 _ng_hook_private(hook_p hook, char * file, int line)
 239 {
 240         _chkhook(hook, file, line);
 241         return (_NG_HOOK_PRIVATE(hook));
 242 }
 243
 244 static __inline int
 245 _ng_hook_not_valid(hook_p hook, char * file, int line)
 246 {
 247         _chkhook(hook, file, line);
 248         return (_NG_HOOK_NOT_VALID(hook));
 249 }
 250
 251 static __inline int
 252 _ng_hook_is_valid(hook_p hook, char * file, int line)
 253 {
 254         _chkhook(hook, file, line);
 255         return (_NG_HOOK_IS_VALID(hook));
 256 }
 257
 258 static __inline node_p
 259 _ng_hook_node(hook_p hook, char * file, int line)
 260 {
 261         _chkhook(hook, file, line);
 262         return (_NG_HOOK_NODE(hook));
 263 }
 264
 265 static __inline hook_p
 266 _ng_hook_peer(hook_p hook, char * file, int line)
 267 {
 268         _chkhook(hook, file, line);
 269         return (_NG_HOOK_PEER(hook));
 270 }
 271
 272 static __inline void
 273 _ng_hook_force_writer(hook_p hook, char * file, int line)
 274 {
 275         _chkhook(hook, file, line);
 276         _NG_HOOK_FORCE_WRITER(hook);
 277 }
 278
 279 static __inline void
 280 _ng_hook_force_queue(hook_p hook, char * file, int line)
 281 {
 282         _chkhook(hook, file, line);
 283         _NG_HOOK_FORCE_QUEUE(hook);
 284 }
 285
 286 static __inline void
 287 _ng_hook_hi_stack(hook_p hook, char * file, int line)
 288 {
 289         _chkhook(hook, file, line);
 290         _NG_HOOK_HI_STACK(hook);
 291 }
 292
 293
 294 #define NG_HOOK_REF(hook)               _ng_hook_ref(hook, _NN_)
 295 #define NG_HOOK_NAME(hook)              _ng_hook_name(hook, _NN_)
 296 #define NG_HOOK_UNREF(hook)             _ng_hook_unref(hook, _NN_)
 297 #define NG_HOOK_SET_PRIVATE(hook, val)  _ng_hook_set_private(hook, val, _NN_)
 298 #define NG_HOOK_SET_RCVMSG(hook, val)   _ng_hook_set_rcvmsg(hook, val, _NN_)
 299 #define NG_HOOK_SET_RCVDATA(hook, val)  _ng_hook_set_rcvdata(hook, val, _NN_)
 300 #define NG_HOOK_PRIVATE(hook)           _ng_hook_private(hook, _NN_)
 301 #define NG_HOOK_NOT_VALID(hook)         _ng_hook_not_valid(hook, _NN_)
 302 #define NG_HOOK_IS_VALID(hook)          _ng_hook_is_valid(hook, _NN_)
 303 #define NG_HOOK_NODE(hook)              _ng_hook_node(hook, _NN_)
 304 #define NG_HOOK_PEER(hook)              _ng_hook_peer(hook, _NN_)
 305 #define NG_HOOK_FORCE_WRITER(hook)      _ng_hook_force_writer(hook, _NN_)
 306 #define NG_HOOK_FORCE_QUEUE(hook)       _ng_hook_force_queue(hook, _NN_)
 307 #define NG_HOOK_HI_STACK(hook)          _ng_hook_hi_stack(hook, _NN_)
 308
 309 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 310
 311 #define NG_HOOK_REF(hook)               _NG_HOOK_REF(hook)
 312 #define NG_HOOK_NAME(hook)              _NG_HOOK_NAME(hook)
 313 #define NG_HOOK_UNREF(hook)             _NG_HOOK_UNREF(hook)
 314 #define NG_HOOK_SET_PRIVATE(hook, val)  _NG_HOOK_SET_PRIVATE(hook, val)
 315 #define NG_HOOK_SET_RCVMSG(hook, val)   _NG_HOOK_SET_RCVMSG(hook, val)
 316 #define NG_HOOK_SET_RCVDATA(hook, val)  _NG_HOOK_SET_RCVDATA(hook, val)
 317 #define NG_HOOK_PRIVATE(hook)           _NG_HOOK_PRIVATE(hook)
 318 #define NG_HOOK_NOT_VALID(hook)         _NG_HOOK_NOT_VALID(hook)
 319 #define NG_HOOK_IS_VALID(hook)          _NG_HOOK_IS_VALID(hook)
 320 #define NG_HOOK_NODE(hook)              _NG_HOOK_NODE(hook)
 321 #define NG_HOOK_PEER(hook)              _NG_HOOK_PEER(hook)
 322 #define NG_HOOK_FORCE_WRITER(hook)      _NG_HOOK_FORCE_WRITER(hook)
 323 #define NG_HOOK_FORCE_QUEUE(hook)       _NG_HOOK_FORCE_QUEUE(hook)
 324 #define NG_HOOK_HI_STACK(hook)          _NG_HOOK_HI_STACK(hook)
 325
 326 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 327
 328 /***********************************************************************
 329  ***************** Node Structure and Methods **************************
 330  ***********************************************************************
 331  * Structure of a node
 332  * including the eembedded queue structure.
 333  *
 334  * The structure for queueing Netgraph request items
 335  * embedded in the node structure
 336  */
 337 struct ng_queue {
 338         u_int           q_flags;        /* Current r/w/q lock flags */
 339         u_int           q_flags2;       /* Other queue flags */
 340         struct mtx      q_mtx;
 341         STAILQ_ENTRY(ng_node)   q_work; /* nodes with work to do */
 342         STAILQ_HEAD(, ng_item)  queue;  /* actually items queue */
 343 };
 344
 345 struct ng_node {
 346         char    nd_name[NG_NODESIZ];    /* optional globally unique name */
 347         struct  ng_type *nd_type;       /* the installed 'type' */
 348         int     nd_flags;               /* see below for bit definitions */
 349         int     nd_numhooks;            /* number of hooks */
 350         void   *nd_private;             /* node type dependant node ID */
 351         ng_ID_t nd_ID;                  /* Unique per node */
 352         LIST_HEAD(hooks, ng_hook) nd_hooks;     /* linked list of node hooks */
 353         LIST_ENTRY(ng_node)       nd_nodes;     /* linked list of all nodes */
 354         LIST_ENTRY(ng_node)       nd_idnodes;   /* ID hash collision list */
 355         struct  ng_queue          nd_input_queue; /* input queue for locking */
 356         int     nd_refs;                /* # of references to this node */
 357 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 358 #define ND_MAGIC 0x59264837
 359         int     nd_magic;
 360         char    *lastfile;
 361         int     lastline;
 362         SLIST_ENTRY(ng_node)      nd_all;       /* all existing nodes */
 363 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 364 };
 365
 366 /* Flags for a node */
 367 #define NGF_INVALID     0x00000001      /* free when refs go to 0 */
 368 #define NG_INVALID      NGF_INVALID     /* compat for old code */
 369 #define NGF_FORCE_WRITER        0x00000004      /* Never multithread this node */
 370 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
 371 #define NGF_CLOSING     0x00000008      /* ng_rmnode() at work */
 372 #define NG_CLOSING      NGF_CLOSING     /* compat for old code */
 373 #define NGF_REALLY_DIE  0x00000010      /* "persistent" node is unloading */
 374 #define NG_REALLY_DIE   NGF_REALLY_DIE  /* compat for old code */
 375 #define NGF_HI_STACK    0x00000020      /* node has hi stack usage */
 376 #define NGF_TYPE1       0x10000000      /* reserved for type specific storage */
 377 #define NGF_TYPE2       0x20000000      /* reserved for type specific storage */
 378 #define NGF_TYPE3       0x40000000      /* reserved for type specific storage */
 379 #define NGF_TYPE4       0x80000000      /* reserved for type specific storage */
 380
 381 /*
 382  * Public methods for nodes.
 383  * If you can't do it with these you probably shouldn't be doing it.
 384  */
 385 int     ng_unref_node(node_p node); /* don't move this */
 386 #define _NG_NODE_NAME(node)     ((node)->nd_name + 0)
 387 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
 388 #define _NG_NODE_ID(node)       ((node)->nd_ID + 0)
 389 #define _NG_NODE_REF(node)      atomic_add_int(&(node)->nd_refs, 1)
 390 #define _NG_NODE_UNREF(node)    ng_unref_node(node)
 391 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
 392 #define _NG_NODE_PRIVATE(node)  ((node)->nd_private)
 393 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
 394 #define _NG_NODE_NOT_VALID(node)        ((node)->nd_flags & NGF_INVALID)
 395 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
 396 #define _NG_NODE_FORCE_WRITER(node)                                     \
 397         do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
 398 #define _NG_NODE_HI_STACK(node)                                         \
 399         do{ node->nd_flags |= NGF_HI_STACK; }while (0)
 400 #define _NG_NODE_REALLY_DIE(node)                                       \
 401         do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
 402 #define _NG_NODE_REVIVE(node) \
 403         do { node->nd_flags &= ~NGF_INVALID; } while (0)
 404 /*
 405  * The hook iterator.
 406  * This macro will call a function of type ng_fn_eachhook for each
 407  * hook attached to the node. If the function returns 0, then the
 408  * iterator will stop and return a pointer to the hook that returned 0.
 409  */
 410 typedef int     ng_fn_eachhook(hook_p hook, void* arg);
 411 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                   \
 412         do {                                                            \
 413                 hook_p _hook;                                           \
 414                 (rethook) = NULL;                                       \
 415                 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) {    \
 416                         if ((fn)(_hook, arg) == 0) {                    \
 417                                 (rethook) = _hook;                      \
 418                                 break;                                  \
 419                         }                                               \
 420                 }                                                       \
 421         } while (0)
 422
 423 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 424 void    dumpnode(node_p node, char *file, int line);
 425 static __inline void _chknode(node_p node, char *file, int line);
 426 static __inline char * _ng_node_name(node_p node, char *file, int line);
 427 static __inline int _ng_node_has_name(node_p node, char *file, int line);
 428 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
 429 static __inline void _ng_node_ref(node_p node, char *file, int line);
 430 static __inline int _ng_node_unref(node_p node, char *file, int line);
 431 static __inline void _ng_node_set_private(node_p node, void * val,
 432                                                         char *file, int line);
 433 static __inline void * _ng_node_private(node_p node, char *file, int line);
 434 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
 435 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
 436 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
 437 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
 438 static __inline hook_p _ng_node_foreach_hook(node_p node,
 439                         ng_fn_eachhook *fn, void *arg, char *file, int line);
 440 static __inline void _ng_node_revive(node_p node, char *file, int line);
 441
 442 static __inline void
 443 _chknode(node_p node, char *file, int line)
 444 {
 445         if (node->nd_magic != ND_MAGIC) {
 446                 printf("Accessing freed node ");
 447                 dumpnode(node, file, line);
 448         }
 449         node->lastline = line;
 450         node->lastfile = file;
 451 }
 452
 453 static __inline char *
 454 _ng_node_name(node_p node, char *file, int line)
 455 {
 456         _chknode(node, file, line);
 457         return(_NG_NODE_NAME(node));
 458 }
 459
 460 static __inline int
 461 _ng_node_has_name(node_p node, char *file, int line)
 462 {
 463         _chknode(node, file, line);
 464         return(_NG_NODE_HAS_NAME(node));
 465 }
 466
 467 static __inline ng_ID_t
 468 _ng_node_id(node_p node, char *file, int line)
 469 {
 470         _chknode(node, file, line);
 471         return(_NG_NODE_ID(node));
 472 }
 473
 474 static __inline void
 475 _ng_node_ref(node_p node, char *file, int line)
 476 {
 477         _chknode(node, file, line);
 478         _NG_NODE_REF(node);
 479 }
 480
 481 static __inline int
 482 _ng_node_unref(node_p node, char *file, int line)
 483 {
 484         _chknode(node, file, line);
 485         return (_NG_NODE_UNREF(node));
 486 }
 487
 488 static __inline void
 489 _ng_node_set_private(node_p node, void * val, char *file, int line)
 490 {
 491         _chknode(node, file, line);
 492         _NG_NODE_SET_PRIVATE(node, val);
 493 }
 494
 495 static __inline void *
 496 _ng_node_private(node_p node, char *file, int line)
 497 {
 498         _chknode(node, file, line);
 499         return (_NG_NODE_PRIVATE(node));
 500 }
 501
 502 static __inline int
 503 _ng_node_is_valid(node_p node, char *file, int line)
 504 {
 505         _chknode(node, file, line);
 506         return(_NG_NODE_IS_VALID(node));
 507 }
 508
 509 static __inline int
 510 _ng_node_not_valid(node_p node, char *file, int line)
 511 {
 512         _chknode(node, file, line);
 513         return(_NG_NODE_NOT_VALID(node));
 514 }
 515
 516 static __inline int
 517 _ng_node_numhooks(node_p node, char *file, int line)
 518 {
 519         _chknode(node, file, line);
 520         return(_NG_NODE_NUMHOOKS(node));
 521 }
 522
 523 static __inline void
 524 _ng_node_force_writer(node_p node, char *file, int line)
 525 {
 526         _chknode(node, file, line);
 527         _NG_NODE_FORCE_WRITER(node);
 528 }
 529
 530 static __inline void
 531 _ng_node_hi_stack(node_p node, char *file, int line)
 532 {
 533         _chknode(node, file, line);
 534         _NG_NODE_HI_STACK(node);
 535 }
 536
 537 static __inline void
 538 _ng_node_really_die(node_p node, char *file, int line)
 539 {
 540         _chknode(node, file, line);
 541         _NG_NODE_REALLY_DIE(node);
 542 }
 543
 544 static __inline void
 545 _ng_node_revive(node_p node, char *file, int line)
 546 {
 547         _chknode(node, file, line);
 548         _NG_NODE_REVIVE(node);
 549 }
 550
 551 static __inline hook_p
 552 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
 553                                                 char *file, int line)
 554 {
 555         hook_p hook;
 556         _chknode(node, file, line);
 557         _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
 558         return (hook);
 559 }
 560
 561 #define NG_NODE_NAME(node)              _ng_node_name(node, _NN_)
 562 #define NG_NODE_HAS_NAME(node)          _ng_node_has_name(node, _NN_)
 563 #define NG_NODE_ID(node)                _ng_node_id(node, _NN_)
 564 #define NG_NODE_REF(node)               _ng_node_ref(node, _NN_)
 565 #define NG_NODE_UNREF(node)             _ng_node_unref(node, _NN_)
 566 #define NG_NODE_SET_PRIVATE(node, val)  _ng_node_set_private(node, val, _NN_)
 567 #define NG_NODE_PRIVATE(node)           _ng_node_private(node, _NN_)
 568 #define NG_NODE_IS_VALID(node)          _ng_node_is_valid(node, _NN_)
 569 #define NG_NODE_NOT_VALID(node)         _ng_node_not_valid(node, _NN_)
 570 #define NG_NODE_FORCE_WRITER(node)      _ng_node_force_writer(node, _NN_)
 571 #define NG_NODE_HI_STACK(node)          _ng_node_hi_stack(node, _NN_)
 572 #define NG_NODE_REALLY_DIE(node)        _ng_node_really_die(node, _NN_)
 573 #define NG_NODE_NUMHOOKS(node)          _ng_node_numhooks(node, _NN_)
 574 #define NG_NODE_REVIVE(node)            _ng_node_revive(node, _NN_)
 575 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                          \
 576         do {                                                                  \
 577                 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
 578         } while (0)
 579
 580 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 581
 582 #define NG_NODE_NAME(node)              _NG_NODE_NAME(node)
 583 #define NG_NODE_HAS_NAME(node)          _NG_NODE_HAS_NAME(node)
 584 #define NG_NODE_ID(node)                _NG_NODE_ID(node)
 585 #define NG_NODE_REF(node)               _NG_NODE_REF(node)
 586 #define NG_NODE_UNREF(node)             _NG_NODE_UNREF(node)
 587 #define NG_NODE_SET_PRIVATE(node, val)  _NG_NODE_SET_PRIVATE(node, val)
 588 #define NG_NODE_PRIVATE(node)           _NG_NODE_PRIVATE(node)
 589 #define NG_NODE_IS_VALID(node)          _NG_NODE_IS_VALID(node)
 590 #define NG_NODE_NOT_VALID(node)         _NG_NODE_NOT_VALID(node)
 591 #define NG_NODE_FORCE_WRITER(node)      _NG_NODE_FORCE_WRITER(node)
 592 #define NG_NODE_HI_STACK(node)          _NG_NODE_HI_STACK(node)
 593 #define NG_NODE_REALLY_DIE(node)        _NG_NODE_REALLY_DIE(node)
 594 #define NG_NODE_NUMHOOKS(node)          _NG_NODE_NUMHOOKS(node)
 595 #define NG_NODE_REVIVE(node)            _NG_NODE_REVIVE(node)
 596 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                    \
 597                 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
 598 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 599
 600 /***********************************************************************
 601  ************* Node Queue and Item Structures and Methods **************
 602  ***********************************************************************
 603  *
 604  */
 605 typedef void    ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
 606 typedef int     ng_item_fn2(node_p node, struct ng_item *item, hook_p hook);
 607 typedef void    ng_apply_t(void *context, int error);
 608 struct ng_apply_info {
 609         ng_apply_t      *apply;
 610         void            *context;
 611         int             refs;
 612         int             error;
 613 };
 614 struct ng_item {
 615         u_long  el_flags;
 616         STAILQ_ENTRY(ng_item)   el_next;
 617         node_p  el_dest; /* The node it will be applied against (or NULL) */
 618         hook_p  el_hook; /* Entering hook. Optional in Control messages */
 619         union {
 620                 struct mbuf     *da_m;
 621                 struct {
 622                         struct ng_mesg  *msg_msg;
 623                         ng_ID_t         msg_retaddr;
 624                 } msg;
 625                 struct {
 626                         union {
 627                                 ng_item_fn      *fn_fn;
 628                                 ng_item_fn2     *fn_fn2;
 629                         } fn_fn;
 630                         void            *fn_arg1;
 631                         int             fn_arg2;
 632                 } fn;
 633         } body;
 634         /*
 635          * Optional callback called when item is being applied,
 636          * and its context.
 637          */
 638         struct ng_apply_info    *apply;
 639         u_int   depth;
 640 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
 641         char *lastfile;
 642         int  lastline;
 643         TAILQ_ENTRY(ng_item)      all;          /* all existing items */
 644 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 645 };
 646
 647 #define NGQF_TYPE       0x03            /* MASK of content definition */
 648 #define NGQF_MESG       0x00            /* the queue element is a message */
 649 #define NGQF_DATA       0x01            /* the queue element is data */
 650 #define NGQF_FN         0x02            /* the queue element is a function */
 651 #define NGQF_FN2        0x03            /* the queue element is a new function */
 652
 653 #define NGQF_RW         0x04            /* MASK for wanted queue mode */
 654 #define NGQF_READER     0x04            /* wants to be a reader */
 655 #define NGQF_WRITER     0x00            /* wants to be a writer */
 656
 657 #define NGQF_QMODE      0x08            /* MASK for how it was queued */
 658 #define NGQF_QREADER    0x08            /* was queued as a reader */
 659 #define NGQF_QWRITER    0x00            /* was queued as a writer */
 660
 661 /*
 662  * Get the mbuf (etc) out of an item.
 663  * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
 664  * with it, (to avoid freeing the things twice).
 665  * If you don't want to zero out the item then realise that the
 666  * item still owns it.
 667  * Retaddr is different. There are no references on that. It's just a number.
 668  * The debug versions must be either all used everywhere or not at all.
 669  */
 670
 671 #define _NGI_M(i) ((i)->body.da_m)
 672 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
 673 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
 674 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn)
 675 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2)
 676 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
 677 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
 678 #define _NGI_NODE(i) ((i)->el_dest)
 679 #define _NGI_HOOK(i) ((i)->el_hook)
 680 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
 681 #define _NGI_CLR_HOOK(i)   do {                                         \
 682                 hook_p _hook = _NGI_HOOK(i);                            \
 683                 if (_hook) {                                            \
 684                         _NG_HOOK_UNREF(_hook);                          \
 685                         _NGI_HOOK(i) = NULL;                            \
 686                 }                                                       \
 687         } while (0)
 688 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
 689 #define _NGI_CLR_NODE(i)   do {                                         \
 690                 node_p _node = _NGI_NODE(i);                            \
 691                 if (_node) {                                            \
 692                         _NG_NODE_UNREF(_node);                          \
 693                         _NGI_NODE(i) = NULL;                            \
 694                 }                                                       \
 695         } while (0)
 696
 697 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
 698 void                            dumpitem(item_p item, char *file, int line);
 699 static __inline void            _ngi_check(item_p item, char *file, int line) ;
 700 static __inline struct mbuf **  _ngi_m(item_p item, char *file, int line) ;
 701 static __inline ng_ID_t *       _ngi_retaddr(item_p item, char *file, int line);
 702 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
 703 static __inline ng_item_fn **   _ngi_fn(item_p item, char *file, int line) ;
 704 static __inline ng_item_fn2 **  _ngi_fn2(item_p item, char *file, int line) ;
 705 static __inline void **         _ngi_arg1(item_p item, char *file, int line) ;
 706 static __inline int *           _ngi_arg2(item_p item, char *file, int line) ;
 707 static __inline node_p          _ngi_node(item_p item, char *file, int line);
 708 static __inline hook_p          _ngi_hook(item_p item, char *file, int line);
 709
 710 static __inline void
 711 _ngi_check(item_p item, char *file, int line)
 712 {
 713         (item)->lastline = line;
 714         (item)->lastfile = file;
 715 }
 716
 717 static __inline struct mbuf **
 718 _ngi_m(item_p item, char *file, int line)
 719 {
 720         _ngi_check(item, file, line);
 721         return (&_NGI_M(item));
 722 }
 723
 724 static __inline struct ng_mesg **
 725 _ngi_msg(item_p item, char *file, int line)
 726 {
 727         _ngi_check(item, file, line);
 728         return (&_NGI_MSG(item));
 729 }
 730
 731 static __inline ng_ID_t *
 732 _ngi_retaddr(item_p item, char *file, int line)
 733 {
 734         _ngi_check(item, file, line);
 735         return (&_NGI_RETADDR(item));
 736 }
 737
 738 static __inline ng_item_fn **
 739 _ngi_fn(item_p item, char *file, int line)
 740 {
 741         _ngi_check(item, file, line);
 742         return (&_NGI_FN(item));
 743 }
 744
 745 static __inline ng_item_fn2 **
 746 _ngi_fn2(item_p item, char *file, int line)
 747 {
 748         _ngi_check(item, file, line);
 749         return (&_NGI_FN2(item));
 750 }
 751
 752 static __inline void **
 753 _ngi_arg1(item_p item, char *file, int line)
 754 {
 755         _ngi_check(item, file, line);
 756         return (&_NGI_ARG1(item));
 757 }
 758
 759 static __inline int *
 760 _ngi_arg2(item_p item, char *file, int line)
 761 {
 762         _ngi_check(item, file, line);
 763         return (&_NGI_ARG2(item));
 764 }
 765
 766 static __inline node_p
 767 _ngi_node(item_p item, char *file, int line)
 768 {
 769         _ngi_check(item, file, line);
 770         return (_NGI_NODE(item));
 771 }
 772
 773 static __inline hook_p
 774 _ngi_hook(item_p item, char *file, int line)
 775 {
 776         _ngi_check(item, file, line);
 777         return (_NGI_HOOK(item));
 778 }
 779
 780 #define NGI_M(i)        (*_ngi_m(i, _NN_))
 781 #define NGI_MSG(i)      (*_ngi_msg(i, _NN_))
 782 #define NGI_RETADDR(i)  (*_ngi_retaddr(i, _NN_))
 783 #define NGI_FN(i)       (*_ngi_fn(i, _NN_))
 784 #define NGI_FN2(i)      (*_ngi_fn2(i, _NN_))
 785 #define NGI_ARG1(i)     (*_ngi_arg1(i, _NN_))
 786 #define NGI_ARG2(i)     (*_ngi_arg2(i, _NN_))
 787 #define NGI_HOOK(i)     _ngi_hook(i, _NN_)
 788 #define NGI_NODE(i)     _ngi_node(i, _NN_)
 789 #define NGI_SET_HOOK(i,h)                                               \
 790         do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
 791 #define NGI_CLR_HOOK(i)                                                 \
 792         do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
 793 #define NGI_SET_NODE(i,n)                                               \
 794         do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
 795 #define NGI_CLR_NODE(i)                                                 \
 796         do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
 797
 798 #define NG_FREE_ITEM(item)                                              \
 799         do {                                                            \
 800                 _ngi_check(item, _NN_);                                 \
 801                 ng_free_item((item));                                   \
 802         } while (0)
 803
 804 #define SAVE_LINE(item)                                                 \
 805         do {                                                            \
 806                 (item)->lastline = __LINE__;                            \
 807                 (item)->lastfile = __FILE__;                            \
 808         } while (0)
 809
 810 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 811
 812 #define NGI_M(i)        _NGI_M(i)
 813 #define NGI_MSG(i)      _NGI_MSG(i)
 814 #define NGI_RETADDR(i)  _NGI_RETADDR(i)
 815 #define NGI_FN(i)       _NGI_FN(i)
 816 #define NGI_FN2(i)      _NGI_FN2(i)
 817 #define NGI_ARG1(i)     _NGI_ARG1(i)
 818 #define NGI_ARG2(i)     _NGI_ARG2(i)
 819 #define NGI_NODE(i)     _NGI_NODE(i)
 820 #define NGI_HOOK(i)     _NGI_HOOK(i)
 821 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
 822 #define NGI_CLR_HOOK(i)   _NGI_CLR_HOOK(i)
 823 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
 824 #define NGI_CLR_NODE(i)   _NGI_CLR_NODE(i)
 825
 826 #define NG_FREE_ITEM(item)      ng_free_item((item))
 827 #define SAVE_LINE(item)         do {} while (0)
 828
 829 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
 830
 831 #define NGI_GET_M(i,m)                                                  \
 832         do {                                                            \
 833                 (m) = NGI_M(i);                                         \
 834                 _NGI_M(i) = NULL;                                       \
 835         } while (0)
 836
 837 #define NGI_GET_MSG(i,m)                                                \
 838         do {                                                            \
 839                 (m) = NGI_MSG(i);                                       \
 840                 _NGI_MSG(i) = NULL;                                     \
 841         } while (0)
 842
 843 #define NGI_GET_NODE(i,n)       /* YOU NOW HAVE THE REFERENCE */        \
 844         do {                                                            \
 845                 (n) = NGI_NODE(i);                                      \
 846                 _NGI_NODE(i) = NULL;                                    \
 847         } while (0)
 848
 849 #define NGI_GET_HOOK(i,h)                                               \
 850         do {                                                            \
 851                 (h) = NGI_HOOK(i);                                      \
 852                 _NGI_HOOK(i) = NULL;                                    \
 853         } while (0)
 854
 855 #define NGI_SET_WRITER(i)       ((i)->el_flags &= ~NGQF_QMODE)
 856 #define NGI_SET_READER(i)       ((i)->el_flags |= NGQF_QREADER)
 857
 858 #define NGI_QUEUED_READER(i)    ((i)->el_flags & NGQF_QREADER)
 859 #define NGI_QUEUED_WRITER(i)    (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
 860
 861 /**********************************************************************
 862 * Data macros.  Send, manipulate and free.
 863 **********************************************************************/
 864 /*
 865  * Assuming the data is already ok, just set the new address and send
 866  */
 867 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags)                \
 868         do {                                                            \
 869                 (error) =                                               \
 870                     ng_address_hook(NULL, (item), (hook), NG_NOFLAGS);  \
 871                 if (error == 0) {                                       \
 872                         SAVE_LINE(item);                                \
 873                         (error) = ng_snd_item((item), (flags));         \
 874                 }                                                       \
 875                 (item) = NULL;                                          \
 876         } while (0)
 877 #define NG_FWD_ITEM_HOOK(error, item, hook)     \
 878                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
 879
 880 /*
 881  * Forward a data packet. Mbuf pointer is updated to new value. We
 882  * presume you dealt with the old one when you update it to the new one
 883  * (or it maybe the old one). We got a packet and possibly had to modify
 884  * the mbuf. You should probably use NGI_GET_M() if you are going to use
 885  * this too.
 886  */
 887 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags)              \
 888         do {                                                            \
 889                 NGI_M(item) = (m);                                      \
 890                 (m) = NULL;                                             \
 891                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags);       \
 892         } while (0)
 893 #define NG_FWD_NEW_DATA(error, item, hook, m)   \
 894                 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
 895
 896 /* Send a previously unpackaged mbuf. XXX: This should be called
 897  * NG_SEND_DATA in future, but this name is kept for compatibility
 898  * reasons.
 899  */
 900 #define NG_SEND_DATA_FLAGS(error, hook, m, flags)                       \
 901         do {                                                            \
 902                 item_p _item;                                           \
 903                 if ((_item = ng_package_data((m), flags))) {            \
 904                         NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
 905                 } else {                                                \
 906                         (error) = ENOMEM;                               \
 907                 }                                                       \
 908                 (m) = NULL;                                             \
 909         } while (0)
 910
 911 #define NG_SEND_DATA_ONLY(error, hook, m)       \
 912                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
 913 /* NG_SEND_DATA() compat for meta-data times */
 914 #define NG_SEND_DATA(error, hook, m, x) \
 915                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
 916
 917 #define NG_FREE_MSG(msg)                                                \
 918         do {                                                            \
 919                 if ((msg)) {                                            \
 920                         FREE((msg), M_NETGRAPH_MSG);                    \
 921                         (msg) = NULL;                                   \
 922                 }                                                       \
 923         } while (0)
 924
 925 #define NG_FREE_M(m)                                                    \
 926         do {                                                            \
 927                 if ((m)) {                                              \
 928                         m_freem((m));                                   \
 929                         (m) = NULL;                                     \
 930                 }                                                       \
 931         } while (0)
 932
 933 /*****************************************
 934 * Message macros
 935 *****************************************/
 936
 937 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr)               \
 938         do {                                                            \
 939                 item_p _item;                                           \
 940                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 941                         (msg) = NULL;                                   \
 942                         (error) = ENOMEM;                               \
 943                         break;                                          \
 944                 }                                                       \
 945                 if (((error) = ng_address_hook((here), (_item),         \
 946                                         (hook), (retaddr))) == 0) {     \
 947                         SAVE_LINE(_item);                               \
 948                         (error) = ng_snd_item((_item), 0);              \
 949                 }                                                       \
 950                 (msg) = NULL;                                           \
 951         } while (0)
 952
 953 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr)               \
 954         do {                                                            \
 955                 item_p _item;                                           \
 956                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 957                         (msg) = NULL;                                   \
 958                         (error) = ENOMEM;                               \
 959                         break;                                          \
 960                 }                                                       \
 961                 if (((error) = ng_address_path((here), (_item),         \
 962                                         (path), (retaddr))) == 0) {     \
 963                         SAVE_LINE(_item);                               \
 964                         (error) = ng_snd_item((_item), 0);              \
 965                 }                                                       \
 966                 (msg) = NULL;                                           \
 967         } while (0)
 968
 969 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr)                   \
 970         do {                                                            \
 971                 item_p _item;                                           \
 972                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
 973                         (msg) = NULL;                                   \
 974                         (error) = ENOMEM;                               \
 975                         break;                                          \
 976                 }                                                       \
 977                 if (((error) = ng_address_ID((here), (_item),           \
 978                                         (ID), (retaddr))) == 0) {       \
 979                         SAVE_LINE(_item);                               \
 980                         (error) = ng_snd_item((_item), 0);              \
 981                 }                                                       \
 982                 (msg) = NULL;                                           \
 983         } while (0)
 984
 985 /*
 986  * Redirect the message to the next hop using the given hook.
 987  * ng_retarget_msg() frees the item if there is an error
 988  * and returns an error code.  It returns 0 on success.
 989  */
 990 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr)               \
 991         do {                                                            \
 992                 if (((error) = ng_address_hook((here), (item),          \
 993                                         (hook), (retaddr))) == 0) {     \
 994                         SAVE_LINE(item);                                \
 995                         (error) = ng_snd_item((item), 0);               \
 996                 }                                                       \
 997                 (item) = NULL;                                          \
 998         } while (0)
 999
1000 /*
1001  * Send a queue item back to it's originator with a response message.
1002  * Assume original message was removed and freed separatly.
1003  */
1004 #define NG_RESPOND_MSG(error, here, item, resp)                         \
1005         do {                                                            \
1006                 if (resp) {                                             \
1007                         ng_ID_t _dest = NGI_RETADDR(item);              \
1008                         NGI_RETADDR(item) = 0;                          \
1009                         NGI_MSG(item) = resp;                           \
1010                         if ((error = ng_address_ID((here), (item),      \
1011                                         _dest, 0)) == 0) {              \
1012                                 SAVE_LINE(item);                        \
1013                                 (error) = ng_snd_item((item), NG_QUEUE);\
1014                         }                                               \
1015                 } else                                                  \
1016                         NG_FREE_ITEM(item);                             \
1017                 (item) = NULL;                                          \
1018         } while (0)
1019
1020
1021 /***********************************************************************
1022  ******** Structures Definitions and Macros for defining a node  *******
1023  ***********************************************************************
1024  *
1025  * Here we define the structures needed to actually define a new node
1026  * type.
1027  */
1028
1029 /*
1030  * Command list -- each node type specifies the command that it knows
1031  * how to convert between ASCII and binary using an array of these.
1032  * The last element in the array must be a terminator with cookie=0.
1033  */
1034
1035 struct ng_cmdlist {
1036         u_int32_t                       cookie;         /* command typecookie */
1037         int                             cmd;            /* command number */
1038         const char                      *name;          /* command name */
1039         const struct ng_parse_type      *mesgType;      /* args if !NGF_RESP */
1040         const struct ng_parse_type      *respType;      /* args if NGF_RESP */
1041 };
1042
1043 /*
1044  * Structure of a node type
1045  * If data is sent to the "rcvdata()" entrypoint then the system
1046  * may decide to defer it until later by queing it with the normal netgraph
1047  * input queuing system.  This is decidde by the HK_QUEUE flag being set in
1048  * the flags word of the peer (receiving) hook. The dequeuing mechanism will
1049  * ensure it is not requeued again.
1050  * Note the input queueing system is to allow modules
1051  * to 'release the stack' or to pass data across spl layers.
1052  * The data will be redelivered as soon as the NETISR code runs
1053  * which may be almost immediatly.  A node may also do it's own queueing
1054  * for other reasons (e.g. device output queuing).
1055  */
1056 struct ng_type {
1057
1058         u_int32_t       version;        /* must equal NG_API_VERSION */
1059         const char      *name;          /* Unique type name */
1060         modeventhand_t  mod_event;      /* Module event handler (optional) */
1061         ng_constructor_t *constructor;  /* Node constructor */
1062         ng_rcvmsg_t     *rcvmsg;        /* control messages come here */
1063         ng_close_t      *close;         /* warn about forthcoming shutdown */
1064         ng_shutdown_t   *shutdown;      /* reset, and free resources */
1065         ng_newhook_t    *newhook;       /* first notification of new hook */
1066         ng_findhook_t   *findhook;      /* only if you have lots of hooks */
1067         ng_connect_t    *connect;       /* final notification of new hook */
1068         ng_rcvdata_t    *rcvdata;       /* data comes here */
1069         ng_disconnect_t *disconnect;    /* notify on disconnect */
1070
1071         const struct    ng_cmdlist *cmdlist;    /* commands we can convert */
1072
1073         /* R/W data private to the base netgraph code DON'T TOUCH! */
1074         LIST_ENTRY(ng_type) types;              /* linked list of all types */
1075         int                 refs;               /* number of instances */
1076 };
1077
1078 /*
1079  * Use the NETGRAPH_INIT() macro to link a node type into the
1080  * netgraph system. This works for types compiled into the kernel
1081  * as well as KLD modules. The first argument should be the type
1082  * name (eg, echo) and the second a pointer to the type struct.
1083  *
1084  * If a different link time is desired, e.g., a device driver that
1085  * needs to install its netgraph type before probing, use the
1086  * NETGRAPH_INIT_ORDERED() macro instead.  Device drivers probably
1087  * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
1088  */
1089
1090 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order)        \
1091 static moduledata_t ng_##typename##_mod = {                             \
1092         "ng_" #typename,                                                \
1093         ng_mod_event,                                                   \
1094         (typestructp)                                                   \
1095 };                                                                      \
1096 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order);         \
1097 MODULE_DEPEND(ng_##typename, netgraph,  NG_ABI_VERSION,                 \
1098                                         NG_ABI_VERSION,                 \
1099                                         NG_ABI_VERSION)
1100
1101 #define NETGRAPH_INIT(tn, tp)                                           \
1102         NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
1103
1104 /* Special malloc() type for netgraph structs and ctrl messages */
1105 /* Only these two types should be visible to nodes */
1106 MALLOC_DECLARE(M_NETGRAPH);
1107 MALLOC_DECLARE(M_NETGRAPH_MSG);
1108
1109 /* declare the base of the netgraph sysclt hierarchy */
1110 /* but only if this file cares about sysctls */
1111 #ifdef  SYSCTL_DECL
1112 SYSCTL_DECL(_net_graph);
1113 #endif
1114
1115 /*
1116  * Methods that the nodes can use.
1117  * Many of these methods should usually NOT be used directly but via
1118  * Macros above.
1119  */
1120 int     ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
1121 int     ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
1122 int     ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
1123 int     ng_bypass(hook_p hook1, hook_p hook2);
1124 hook_p  ng_findhook(node_p node, const char *name);
1125 struct  ng_type *ng_findtype(const char *type);
1126 int     ng_make_node_common(struct ng_type *typep, node_p *nodep);
1127 int     ng_name_node(node_p node, const char *name);
1128 int     ng_newtype(struct ng_type *tp);
1129 ng_ID_t ng_node2ID(node_p node);
1130 item_p  ng_package_data(struct mbuf *m, int flags);
1131 item_p  ng_package_msg(struct ng_mesg *msg, int flags);
1132 item_p  ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
1133 void    ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
1134 int     ng_rmhook_self(hook_p hook);    /* if a node wants to kill a hook */
1135 int     ng_rmnode_self(node_p here);    /* if a node wants to suicide */
1136 int     ng_rmtype(struct ng_type *tp);
1137 int     ng_snd_item(item_p item, int queue);
1138 int     ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1139         int arg2);
1140 int     ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
1141         int arg2, int flags);
1142 int     ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn,
1143         void *arg1, int arg2, int flags);
1144 int     ng_uncallout(struct callout *c, node_p node);
1145 int     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  */
1160 void    ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
1161 int     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
1169 struct 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  */
1181 typedef 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 #endif /* _NETGRAPH_NETGRAPH_H_ */