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sys/netgraph/netgraph.h

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    1 /*
    2  * netgraph.h
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Julian Elischer <julian@freebsd.org>
   39  *
   40  * $FreeBSD: src/sys/netgraph/netgraph.h,v 1.55.2.2 2005/08/15 20:04:28 julian 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/lock.h>
   53 #include <sys/malloc.h>
   54 #include <sys/module.h>
   55 #include <sys/mutex.h>
   56 
   57 #include "opt_netgraph.h"
   58 
   59 /* debugging options */
   60 #define NG_SEPARATE_MALLOC      /* make modules use their own malloc types */
   61 
   62 /*
   63  * This defines the in-kernel binary interface version.
   64  * It is possible to change this but leave the external message
   65  * API the same. Each type also has it's own cookies for versioning as well.
   66  * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
   67  * modules.
   68  */
   69 #define _NG_ABI_VERSION 11
   70 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
   71 #define NG_ABI_VERSION  (_NG_ABI_VERSION + 0x10000)
   72 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
   73 #define NG_ABI_VERSION  _NG_ABI_VERSION
   74 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
   75 
   76 
   77 /*
   78  * Forward references for the basic structures so we can
   79  * define the typedefs and use them in the structures themselves.
   80  */
   81 struct ng_hook ;
   82 struct ng_node ;
   83 struct ng_item ;
   84 typedef struct ng_item *item_p;
   85 typedef struct ng_node *node_p;
   86 typedef struct ng_hook *hook_p;
   87 
   88 /* node method definitions */
   89 typedef int     ng_constructor_t(node_p node);
   90 typedef int     ng_close_t(node_p node);
   91 typedef int     ng_shutdown_t(node_p node);
   92 typedef int     ng_newhook_t(node_p node, hook_p hook, const char *name);
   93 typedef hook_p  ng_findhook_t(node_p node, const char *name);
   94 typedef int     ng_connect_t(hook_p hook);
   95 typedef int     ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
   96 typedef int     ng_rcvdata_t(hook_p hook, item_p item);
   97 typedef int     ng_disconnect_t(hook_p hook);
   98 typedef int     ng_rcvitem (node_p node, hook_p hook, item_p item);
   99 
  100 /***********************************************************************
  101  ***************** Hook Structure and Methods **************************
  102  ***********************************************************************
  103  *
  104  * Structure of a hook
  105  */
  106 struct ng_hook {
  107         char    hk_name[NG_HOOKSIZ];    /* what this node knows this link as */
  108         void   *hk_private;             /* node dependant ID for this hook */
  109         int     hk_flags;               /* info about this hook/link */
  110         int     hk_refs;                /* dont actually free this till 0 */
  111         int     hk_type;                /* tbd: hook data link type */
  112         struct  ng_hook *hk_peer;       /* the other end of this link */
  113         struct  ng_node *hk_node;       /* The node this hook is attached to */
  114         LIST_ENTRY(ng_hook) hk_hooks;   /* linked list of all hooks on node */
  115         ng_rcvmsg_t     *hk_rcvmsg;     /* control messages come here */
  116         ng_rcvdata_t    *hk_rcvdata;    /* data comes here */
  117 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  118 #define HK_MAGIC 0x78573011
  119         int     hk_magic;
  120         char    *lastfile;
  121         int     lastline;
  122         SLIST_ENTRY(ng_hook)      hk_all;               /* all existing items */
  123 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  124 };
  125 /* Flags for a hook */
  126 #define HK_INVALID              0x0001  /* don't trust it! */
  127 #define HK_QUEUE                0x0002  /* queue for later delivery */
  128 #define HK_FORCE_WRITER         0x0004  /* Incoming data queued as a writer */
  129 #define HK_DEAD                 0x0008  /* This is the dead hook.. don't free */
  130 
  131 /*
  132  * Public Methods for hook
  133  * If you can't do it with these you probably shouldn;t be doing it.
  134  */
  135 void ng_unref_hook(hook_p hook); /* don't move this */
  136 #define _NG_HOOK_REF(hook)      atomic_add_int(&(hook)->hk_refs, 1)
  137 #define _NG_HOOK_NAME(hook)     ((hook)->hk_name)
  138 #define _NG_HOOK_UNREF(hook)    ng_unref_hook(hook)
  139 #define _NG_HOOK_SET_PRIVATE(hook, val) do {(hook)->hk_private = val;} while (0)
  140 #define _NG_HOOK_SET_RCVMSG(hook, val)  do {(hook)->hk_rcvmsg = val;} while (0)
  141 #define _NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->hk_rcvdata = val;} while (0)
  142 #define _NG_HOOK_PRIVATE(hook)  ((hook)->hk_private)
  143 #define _NG_HOOK_NOT_VALID(hook)        ((hook)->hk_flags & HK_INVALID)
  144 #define _NG_HOOK_IS_VALID(hook) (!((hook)->hk_flags & HK_INVALID))
  145 #define _NG_HOOK_NODE(hook)     ((hook)->hk_node) /* only rvalue! */
  146 #define _NG_HOOK_PEER(hook)     ((hook)->hk_peer) /* only rvalue! */
  147 #define _NG_HOOK_FORCE_WRITER(hook)                             \
  148                 do { hook->hk_flags |= HK_FORCE_WRITER; } while (0)
  149 #define _NG_HOOK_FORCE_QUEUE(hook) do { hook->hk_flags |= HK_QUEUE; } while (0)
  150 
  151 /* Some shortcuts */
  152 #define NG_PEER_NODE(hook)      NG_HOOK_NODE(NG_HOOK_PEER(hook))
  153 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
  154 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
  155 
  156 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  157 #define _NN_ __FILE__,__LINE__
  158 void    dumphook (hook_p hook, char *file, int line);
  159 static __inline void    _chkhook(hook_p hook, char *file, int line);
  160 static __inline void    _ng_hook_ref(hook_p hook, char * file, int line);
  161 static __inline char *  _ng_hook_name(hook_p hook, char * file, int line);
  162 static __inline void    _ng_hook_unref(hook_p hook, char * file, int line);
  163 static __inline void    _ng_hook_set_private(hook_p hook,
  164                                 void * val, char * file, int line);
  165 static __inline void    _ng_hook_set_rcvmsg(hook_p hook,
  166                                 ng_rcvmsg_t *val, char * file, int line);
  167 static __inline void    _ng_hook_set_rcvdata(hook_p hook,
  168                                 ng_rcvdata_t *val, char * file, int line);
  169 static __inline void *  _ng_hook_private(hook_p hook, char * file, int line);
  170 static __inline int     _ng_hook_not_valid(hook_p hook, char * file, int line);
  171 static __inline int     _ng_hook_is_valid(hook_p hook, char * file, int line);
  172 static __inline node_p  _ng_hook_node(hook_p hook, char * file, int line);
  173 static __inline hook_p  _ng_hook_peer(hook_p hook, char * file, int line);
  174 static __inline void    _ng_hook_force_writer(hook_p hook, char * file,
  175                                         int line);
  176 static __inline void    _ng_hook_force_queue(hook_p hook, char * file, int line);
  177 
  178 static __inline void
  179 _chkhook(hook_p hook, char *file, int line)
  180 {
  181         if (hook->hk_magic != HK_MAGIC) {
  182                 printf("Accessing freed hook ");
  183                 dumphook(hook, file, line);
  184         }
  185         hook->lastline = line;
  186         hook->lastfile = file;
  187 }
  188 
  189 static __inline void
  190 _ng_hook_ref(hook_p hook, char * file, int line)
  191 {
  192         _chkhook(hook, file, line);
  193         _NG_HOOK_REF(hook);
  194 } 
  195 
  196 static __inline char *
  197 _ng_hook_name(hook_p hook, char * file, int line)
  198 {
  199         _chkhook(hook, file, line);
  200         return (_NG_HOOK_NAME(hook));
  201 } 
  202 
  203 static __inline void
  204 _ng_hook_unref(hook_p hook, char * file, int line)
  205 {
  206         _chkhook(hook, file, line);
  207         _NG_HOOK_UNREF(hook);
  208 } 
  209 
  210 static __inline void
  211 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
  212 {
  213         _chkhook(hook, file, line);
  214         _NG_HOOK_SET_PRIVATE(hook, val);
  215 } 
  216 
  217 static __inline void
  218 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
  219 {
  220         _chkhook(hook, file, line);
  221         _NG_HOOK_SET_RCVMSG(hook, val);
  222 } 
  223 
  224 static __inline void
  225 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
  226 {
  227         _chkhook(hook, file, line);
  228         _NG_HOOK_SET_RCVDATA(hook, val);
  229 } 
  230 
  231 static __inline void *
  232 _ng_hook_private(hook_p hook, char * file, int line)
  233 {
  234         _chkhook(hook, file, line);
  235         return (_NG_HOOK_PRIVATE(hook));
  236 } 
  237 
  238 static __inline int
  239 _ng_hook_not_valid(hook_p hook, char * file, int line)
  240 {
  241         _chkhook(hook, file, line);
  242         return (_NG_HOOK_NOT_VALID(hook));
  243 } 
  244 
  245 static __inline int
  246 _ng_hook_is_valid(hook_p hook, char * file, int line)
  247 {
  248         _chkhook(hook, file, line);
  249         return (_NG_HOOK_IS_VALID(hook));
  250 } 
  251 
  252 static __inline node_p
  253 _ng_hook_node(hook_p hook, char * file, int line)
  254 {
  255         _chkhook(hook, file, line);
  256         return (_NG_HOOK_NODE(hook));
  257 } 
  258 
  259 static __inline hook_p
  260 _ng_hook_peer(hook_p hook, char * file, int line)
  261 {
  262         _chkhook(hook, file, line);
  263         return (_NG_HOOK_PEER(hook));
  264 } 
  265 
  266 static __inline void
  267 _ng_hook_force_writer(hook_p hook, char * file, int line)
  268 {
  269         _chkhook(hook, file, line);
  270         _NG_HOOK_FORCE_WRITER(hook);
  271 } 
  272 
  273 static __inline void
  274 _ng_hook_force_queue(hook_p hook, char * file, int line)
  275 {
  276         _chkhook(hook, file, line);
  277         _NG_HOOK_FORCE_QUEUE(hook);
  278 } 
  279 
  280 
  281 #define NG_HOOK_REF(hook)               _ng_hook_ref(hook, _NN_)
  282 #define NG_HOOK_NAME(hook)              _ng_hook_name(hook, _NN_)
  283 #define NG_HOOK_UNREF(hook)             _ng_hook_unref(hook, _NN_)
  284 #define NG_HOOK_SET_PRIVATE(hook, val)  _ng_hook_set_private(hook, val, _NN_)
  285 #define NG_HOOK_SET_RCVMSG(hook, val)   _ng_hook_set_rcvmsg(hook, val, _NN_)
  286 #define NG_HOOK_SET_RCVDATA(hook, val)  _ng_hook_set_rcvdata(hook, val, _NN_)
  287 #define NG_HOOK_PRIVATE(hook)           _ng_hook_private(hook, _NN_)
  288 #define NG_HOOK_NOT_VALID(hook)         _ng_hook_not_valid(hook, _NN_)
  289 #define NG_HOOK_IS_VALID(hook)          _ng_hook_is_valid(hook, _NN_)
  290 #define NG_HOOK_NODE(hook)              _ng_hook_node(hook, _NN_)
  291 #define NG_HOOK_PEER(hook)              _ng_hook_peer(hook, _NN_)
  292 #define NG_HOOK_FORCE_WRITER(hook)      _ng_hook_force_writer(hook, _NN_)
  293 #define NG_HOOK_FORCE_QUEUE(hook)       _ng_hook_force_queue(hook, _NN_)
  294 
  295 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  296 
  297 #define NG_HOOK_REF(hook)               _NG_HOOK_REF(hook)
  298 #define NG_HOOK_NAME(hook)              _NG_HOOK_NAME(hook)
  299 #define NG_HOOK_UNREF(hook)             _NG_HOOK_UNREF(hook)
  300 #define NG_HOOK_SET_PRIVATE(hook, val)  _NG_HOOK_SET_PRIVATE(hook, val)
  301 #define NG_HOOK_SET_RCVMSG(hook, val)   _NG_HOOK_SET_RCVMSG(hook, val)
  302 #define NG_HOOK_SET_RCVDATA(hook, val)  _NG_HOOK_SET_RCVDATA(hook, val)
  303 #define NG_HOOK_PRIVATE(hook)           _NG_HOOK_PRIVATE(hook)
  304 #define NG_HOOK_NOT_VALID(hook)         _NG_HOOK_NOT_VALID(hook)
  305 #define NG_HOOK_IS_VALID(hook)          _NG_HOOK_IS_VALID(hook)
  306 #define NG_HOOK_NODE(hook)              _NG_HOOK_NODE(hook)
  307 #define NG_HOOK_PEER(hook)              _NG_HOOK_PEER(hook)
  308 #define NG_HOOK_FORCE_WRITER(hook)      _NG_HOOK_FORCE_WRITER(hook)
  309 #define NG_HOOK_FORCE_QUEUE(hook)       _NG_HOOK_FORCE_QUEUE(hook)
  310 
  311 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  312 
  313 /***********************************************************************
  314  ***************** Node Structure and Methods **************************
  315  ***********************************************************************
  316  * Structure of a node
  317  * including the eembedded queue structure.
  318  *
  319  * The structure for queueing Netgraph request items 
  320  * embedded in the node structure
  321  */
  322 struct ng_queue {
  323         u_long          q_flags;
  324         struct mtx      q_mtx;
  325         item_p queue;
  326         item_p *last;
  327         struct ng_node *q_node;         /* find the front of the node.. */
  328 };
  329 
  330 struct ng_node {
  331         char    nd_name[NG_NODESIZ];    /* optional globally unique name */
  332         struct  ng_type *nd_type;       /* the installed 'type' */
  333         int     nd_flags;               /* see below for bit definitions */
  334         int     nd_refs;                /* # of references to this node */
  335         int     nd_numhooks;            /* number of hooks */
  336         void   *nd_private;             /* node type dependant node ID */
  337         ng_ID_t nd_ID;                  /* Unique per node */
  338         LIST_HEAD(hooks, ng_hook) nd_hooks;     /* linked list of node hooks */
  339         LIST_ENTRY(ng_node)       nd_nodes;     /* linked list of all nodes */
  340         LIST_ENTRY(ng_node)       nd_idnodes;   /* ID hash collision list */
  341         TAILQ_ENTRY(ng_node)      nd_work;      /* nodes with work to do */
  342         struct  ng_queue          nd_input_queue; /* input queue for locking */
  343 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  344 #define ND_MAGIC 0x59264837
  345         int     nd_magic;
  346         char    *lastfile;
  347         int     lastline;
  348         SLIST_ENTRY(ng_node)      nd_all;       /* all existing nodes */
  349 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  350 };
  351 
  352 /* Flags for a node */
  353 #define NGF_INVALID     0x00000001      /* free when refs go to 0 */
  354 #define NG_INVALID      NGF_INVALID     /* compat for old code */
  355 #define NGF_WORKQ       0x00000002      /* node is on the work queue */
  356 #define NG_WORKQ        NGF_WORKQ       /* compat for old code */
  357 #define NGF_FORCE_WRITER        0x00000004      /* Never multithread this node */
  358 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
  359 #define NGF_CLOSING     0x00000008      /* ng_rmnode() at work */
  360 #define NG_CLOSING      NGF_CLOSING     /* compat for old code */
  361 #define NGF_REALLY_DIE  0x00000010      /* "persistent" node is unloading */
  362 #define NG_REALLY_DIE   NGF_REALLY_DIE  /* compat for old code */
  363 #define NGF_TYPE1       0x10000000      /* reserved for type specific storage */
  364 #define NGF_TYPE2       0x20000000      /* reserved for type specific storage */
  365 #define NGF_TYPE3       0x40000000      /* reserved for type specific storage */
  366 #define NGF_TYPE4       0x80000000      /* reserved for type specific storage */
  367 
  368 /*
  369  * Public methods for nodes.
  370  * If you can't do it with these you probably shouldn't be doing it.
  371  */
  372 int     ng_unref_node(node_p node); /* don't move this */
  373 #define _NG_NODE_NAME(node)     ((node)->nd_name + 0)
  374 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
  375 #define _NG_NODE_ID(node)       ((node)->nd_ID + 0)
  376 #define _NG_NODE_REF(node)      atomic_add_int(&(node)->nd_refs, 1)
  377 #define _NG_NODE_UNREF(node)    ng_unref_node(node)
  378 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
  379 #define _NG_NODE_PRIVATE(node)  ((node)->nd_private)
  380 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
  381 #define _NG_NODE_NOT_VALID(node)        ((node)->nd_flags & NGF_INVALID)
  382 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
  383 #define _NG_NODE_FORCE_WRITER(node)                                     \
  384         do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
  385 #define _NG_NODE_REALLY_DIE(node)                                       \
  386         do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
  387 #define _NG_NODE_REVIVE(node) \
  388         do { node->nd_flags &= ~NGF_INVALID; } while (0)
  389 /*
  390  * The hook iterator.
  391  * This macro will call a function of type ng_fn_eachhook for each
  392  * hook attached to the node. If the function returns 0, then the
  393  * iterator will stop and return a pointer to the hook that returned 0.
  394  */
  395 typedef int     ng_fn_eachhook(hook_p hook, void* arg);
  396 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                   \
  397         do {                                                            \
  398                 hook_p _hook;                                           \
  399                 (rethook) = NULL;                                       \
  400                 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) {    \
  401                         if ((fn)(_hook, arg) == 0) {                    \
  402                                 (rethook) = _hook;                      \
  403                                 break;                                  \
  404                         }                                               \
  405                 }                                                       \
  406         } while (0)
  407 
  408 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  409 void    dumpnode(node_p node, char *file, int line);
  410 static __inline void _chknode(node_p node, char *file, int line);
  411 static __inline char * _ng_node_name(node_p node, char *file, int line);
  412 static __inline int _ng_node_has_name(node_p node, char *file, int line);
  413 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
  414 void ng_ref_node(node_p node);
  415 static __inline void _ng_node_ref(node_p node, char *file, int line);
  416 static __inline int _ng_node_unref(node_p node, char *file, int line);
  417 static __inline void _ng_node_set_private(node_p node, void * val,
  418                                                         char *file, int line);
  419 static __inline void * _ng_node_private(node_p node, char *file, int line);
  420 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
  421 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
  422 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
  423 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
  424 static __inline hook_p _ng_node_foreach_hook(node_p node,
  425                         ng_fn_eachhook *fn, void *arg, char *file, int line);
  426 static __inline void _ng_node_revive(node_p node, char *file, int line);
  427 
  428 static __inline void  
  429 _chknode(node_p node, char *file, int line)
  430 {
  431         if (node->nd_magic != ND_MAGIC) {
  432                 printf("Accessing freed node ");
  433                 dumpnode(node, file, line);
  434         }
  435         node->lastline = line;
  436         node->lastfile = file;
  437 }
  438 
  439 static __inline char *
  440 _ng_node_name(node_p node, char *file, int line)
  441 {
  442         _chknode(node, file, line);
  443         return(_NG_NODE_NAME(node));
  444 }
  445 
  446 static __inline int 
  447 _ng_node_has_name(node_p node, char *file, int line)
  448 {
  449         _chknode(node, file, line);
  450         return(_NG_NODE_HAS_NAME(node));
  451 }
  452 
  453 static __inline ng_ID_t
  454 _ng_node_id(node_p node, char *file, int line)
  455 {
  456         _chknode(node, file, line);
  457         return(_NG_NODE_ID(node));
  458 }
  459 
  460 static __inline void 
  461 _ng_node_ref(node_p node, char *file, int line)
  462 {
  463         _chknode(node, file, line);
  464         /*_NG_NODE_REF(node);*/
  465         ng_ref_node(node);
  466 }
  467 
  468 static __inline int
  469 _ng_node_unref(node_p node, char *file, int line)
  470 {
  471         _chknode(node, file, line);
  472         return (_NG_NODE_UNREF(node));
  473 }
  474 
  475 static __inline void
  476 _ng_node_set_private(node_p node, void * val, char *file, int line)
  477 {
  478         _chknode(node, file, line);
  479         _NG_NODE_SET_PRIVATE(node, val);
  480 }
  481 
  482 static __inline void *
  483 _ng_node_private(node_p node, char *file, int line)
  484 {
  485         _chknode(node, file, line);
  486         return (_NG_NODE_PRIVATE(node));
  487 }
  488 
  489 static __inline int
  490 _ng_node_is_valid(node_p node, char *file, int line)
  491 {
  492         _chknode(node, file, line);
  493         return(_NG_NODE_IS_VALID(node));
  494 }
  495 
  496 static __inline int
  497 _ng_node_not_valid(node_p node, char *file, int line)
  498 {
  499         _chknode(node, file, line);
  500         return(_NG_NODE_NOT_VALID(node));
  501 }
  502 
  503 static __inline int
  504 _ng_node_numhooks(node_p node, char *file, int line)
  505 {
  506         _chknode(node, file, line);
  507         return(_NG_NODE_NUMHOOKS(node));
  508 }
  509 
  510 static __inline void
  511 _ng_node_force_writer(node_p node, char *file, int line)
  512 {
  513         _chknode(node, file, line);
  514         _NG_NODE_FORCE_WRITER(node);
  515 }
  516 
  517 static __inline void
  518 _ng_node_really_die(node_p node, char *file, int line)
  519 {
  520         _chknode(node, file, line);
  521         _NG_NODE_REALLY_DIE(node);
  522 }
  523 
  524 static __inline void
  525 _ng_node_revive(node_p node, char *file, int line)
  526 {
  527         _chknode(node, file, line);
  528         _NG_NODE_REVIVE(node);
  529 }
  530 
  531 static __inline hook_p
  532 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
  533                                                 char *file, int line)
  534 {
  535         hook_p hook;
  536         _chknode(node, file, line);
  537         _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
  538         return (hook);
  539 }
  540 
  541 #define NG_NODE_NAME(node)              _ng_node_name(node, _NN_)       
  542 #define NG_NODE_HAS_NAME(node)          _ng_node_has_name(node, _NN_)   
  543 #define NG_NODE_ID(node)                _ng_node_id(node, _NN_)
  544 #define NG_NODE_REF(node)               _ng_node_ref(node, _NN_)
  545 #define NG_NODE_UNREF(node)             _ng_node_unref(node, _NN_)
  546 #define NG_NODE_SET_PRIVATE(node, val)  _ng_node_set_private(node, val, _NN_)
  547 #define NG_NODE_PRIVATE(node)           _ng_node_private(node, _NN_)
  548 #define NG_NODE_IS_VALID(node)          _ng_node_is_valid(node, _NN_)
  549 #define NG_NODE_NOT_VALID(node)         _ng_node_not_valid(node, _NN_)
  550 #define NG_NODE_FORCE_WRITER(node)      _ng_node_force_writer(node, _NN_)
  551 #define NG_NODE_REALLY_DIE(node)        _ng_node_really_die(node, _NN_)
  552 #define NG_NODE_NUMHOOKS(node)          _ng_node_numhooks(node, _NN_)
  553 #define NG_NODE_REVIVE(node)            _ng_node_revive(node, _NN_)
  554 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                          \
  555         do {                                                                  \
  556                 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
  557         } while (0)
  558 
  559 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  560 
  561 #define NG_NODE_NAME(node)              _NG_NODE_NAME(node)     
  562 #define NG_NODE_HAS_NAME(node)          _NG_NODE_HAS_NAME(node) 
  563 #define NG_NODE_ID(node)                _NG_NODE_ID(node)       
  564 #define NG_NODE_REF(node)               _NG_NODE_REF(node)      
  565 #define NG_NODE_UNREF(node)             _NG_NODE_UNREF(node)    
  566 #define NG_NODE_SET_PRIVATE(node, val)  _NG_NODE_SET_PRIVATE(node, val) 
  567 #define NG_NODE_PRIVATE(node)           _NG_NODE_PRIVATE(node)  
  568 #define NG_NODE_IS_VALID(node)          _NG_NODE_IS_VALID(node) 
  569 #define NG_NODE_NOT_VALID(node)         _NG_NODE_NOT_VALID(node)        
  570 #define NG_NODE_FORCE_WRITER(node)      _NG_NODE_FORCE_WRITER(node)
  571 #define NG_NODE_REALLY_DIE(node)        _NG_NODE_REALLY_DIE(node)
  572 #define NG_NODE_NUMHOOKS(node)          _NG_NODE_NUMHOOKS(node) 
  573 #define NG_NODE_REVIVE(node)            _NG_NODE_REVIVE(node)
  574 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                    \
  575                 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
  576 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  577 
  578 /***********************************************************************
  579  ************* Node Queue and Item Structures and Methods **************
  580  ***********************************************************************
  581  *
  582  */
  583 typedef void    ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
  584 typedef void    ng_apply_t(void *context, int error);
  585 struct ng_item {
  586         u_long  el_flags;
  587         item_p  el_next;
  588         node_p  el_dest; /* The node it will be applied against (or NULL) */
  589         hook_p  el_hook; /* Entering hook. Optional in Control messages */
  590         union {
  591                 struct mbuf     *da_m;
  592                 struct {
  593                         struct ng_mesg  *msg_msg;
  594                         ng_ID_t         msg_retaddr;
  595                 } msg;
  596                 struct {
  597                         ng_item_fn      *fn_fn;
  598                         void            *fn_arg1;
  599                         int             fn_arg2;
  600                 } fn;
  601         } body;
  602         /*
  603          * Optional callback called when item is being applied,
  604          * and its context.
  605          */
  606         ng_apply_t      *apply;
  607         void            *context;
  608 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  609         char *lastfile;
  610         int  lastline;
  611         TAILQ_ENTRY(ng_item)      all;          /* all existing items */
  612 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  613 };
  614 
  615 #define NGQF_TYPE       0x03            /* MASK of content definition */
  616 #define NGQF_MESG       0x00            /* the queue element is a message */
  617 #define NGQF_DATA       0x01            /* the queue element is data */
  618 #define NGQF_FN         0x02            /* the queue element is a function */
  619 #define NGQF_UNDEF      0x03            /* UNDEFINED */
  620 
  621 #define NGQF_RW         0x04            /* MASK for queue entry read/write */
  622 #define NGQF_READER     0x04            /* queued as a reader */
  623 #define NGQF_WRITER     0x00            /* queued as a writer */
  624 
  625 /*
  626  * Get the mbuf (etc) out of an item.
  627  * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
  628  * with it, (to avoid freeing the things twice).
  629  * If you don't want to zero out the item then realise that the
  630  * item still owns it.
  631  * Retaddr is different. There are no references on that. It's just a number.
  632  * The debug versions must be either all used everywhere or not at all.
  633  */
  634 
  635 #define _NGI_M(i) ((i)->body.da_m)
  636 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
  637 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
  638 #define _NGI_FN(i) ((i)->body.fn.fn_fn)
  639 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
  640 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
  641 #define _NGI_NODE(i) ((i)->el_dest)
  642 #define _NGI_HOOK(i) ((i)->el_hook)
  643 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
  644 #define _NGI_CLR_HOOK(i)   do {                                         \
  645                 hook_p _hook = _NGI_HOOK(i);                            \
  646                 if (_hook) {                                            \
  647                         _NG_HOOK_UNREF(_hook);                          \
  648                         _NGI_HOOK(i) = NULL;                            \
  649                 }                                                       \
  650         } while (0)
  651 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
  652 #define _NGI_CLR_NODE(i)   do {                                         \
  653                 node_p _node = _NGI_NODE(i);                            \
  654                 if (_node) {                                            \
  655                         _NG_NODE_UNREF(_node);                          \
  656                         _NGI_NODE(i) = NULL;                            \
  657                 }                                                       \
  658         } while (0)
  659 
  660 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
  661 void                            dumpitem(item_p item, char *file, int line);
  662 static __inline void            _ngi_check(item_p item, char *file, int line) ;
  663 static __inline struct mbuf **  _ngi_m(item_p item, char *file, int line) ;
  664 static __inline ng_ID_t *       _ngi_retaddr(item_p item, char *file, int line);
  665 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
  666 static __inline ng_item_fn **   _ngi_fn(item_p item, char *file, int line) ;
  667 static __inline void **         _ngi_arg1(item_p item, char *file, int line) ;
  668 static __inline int *           _ngi_arg2(item_p item, char *file, int line) ;
  669 static __inline node_p          _ngi_node(item_p item, char *file, int line);
  670 static __inline hook_p          _ngi_hook(item_p item, char *file, int line);
  671 
  672 static __inline void
  673 _ngi_check(item_p item, char *file, int line) 
  674 {
  675         (item)->lastline = line;
  676         (item)->lastfile = file;
  677 }
  678 
  679 static __inline struct mbuf **
  680 _ngi_m(item_p item, char *file, int line) 
  681 {
  682         _ngi_check(item, file, line);
  683         return (&_NGI_M(item));
  684 }
  685 
  686 static __inline struct ng_mesg **
  687 _ngi_msg(item_p item, char *file, int line) 
  688 {
  689         _ngi_check(item, file, line);
  690         return (&_NGI_MSG(item));
  691 }
  692 
  693 static __inline ng_ID_t *
  694 _ngi_retaddr(item_p item, char *file, int line) 
  695 {
  696         _ngi_check(item, file, line);
  697         return (&_NGI_RETADDR(item));
  698 }
  699 
  700 static __inline ng_item_fn **
  701 _ngi_fn(item_p item, char *file, int line) 
  702 {
  703         _ngi_check(item, file, line);
  704         return (&_NGI_FN(item));
  705 }
  706 
  707 static __inline void **
  708 _ngi_arg1(item_p item, char *file, int line) 
  709 {
  710         _ngi_check(item, file, line);
  711         return (&_NGI_ARG1(item));
  712 }
  713 
  714 static __inline int *
  715 _ngi_arg2(item_p item, char *file, int line) 
  716 {
  717         _ngi_check(item, file, line);
  718         return (&_NGI_ARG2(item));
  719 }
  720 
  721 static __inline node_p
  722 _ngi_node(item_p item, char *file, int line)
  723 {
  724         _ngi_check(item, file, line);
  725         return (_NGI_NODE(item));
  726 }
  727 
  728 static __inline hook_p
  729 _ngi_hook(item_p item, char *file, int line)
  730 {
  731         _ngi_check(item, file, line);
  732         return (_NGI_HOOK(item));
  733 }
  734 
  735 #define NGI_M(i)        (*_ngi_m(i, _NN_))
  736 #define NGI_MSG(i)      (*_ngi_msg(i, _NN_))
  737 #define NGI_RETADDR(i)  (*_ngi_retaddr(i, _NN_))
  738 #define NGI_FN(i)       (*_ngi_fn(i, _NN_))
  739 #define NGI_ARG1(i)     (*_ngi_arg1(i, _NN_))
  740 #define NGI_ARG2(i)     (*_ngi_arg2(i, _NN_))
  741 #define NGI_HOOK(i)     _ngi_hook(i, _NN_)
  742 #define NGI_NODE(i)     _ngi_node(i, _NN_)
  743 #define NGI_SET_HOOK(i,h)                                               \
  744         do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
  745 #define NGI_CLR_HOOK(i)                                                 \
  746         do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
  747 #define NGI_SET_NODE(i,n)                                               \
  748         do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
  749 #define NGI_CLR_NODE(i)                                                 \
  750         do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
  751 
  752 #define NG_FREE_ITEM(item)                                              \
  753         do {                                                            \
  754                 _ngi_check(item, _NN_);                                 \
  755                 ng_free_item((item));                                   \
  756         } while (0)
  757 
  758 #define SAVE_LINE(item)                                                 \
  759         do {                                                            \
  760                 (item)->lastline = __LINE__;                            \
  761                 (item)->lastfile = __FILE__;                            \
  762         } while (0)
  763 
  764 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  765 
  766 #define NGI_M(i)        _NGI_M(i)
  767 #define NGI_MSG(i)      _NGI_MSG(i)
  768 #define NGI_RETADDR(i)  _NGI_RETADDR(i)
  769 #define NGI_FN(i)       _NGI_FN(i)
  770 #define NGI_ARG1(i)     _NGI_ARG1(i)
  771 #define NGI_ARG2(i)     _NGI_ARG2(i)
  772 #define NGI_NODE(i)     _NGI_NODE(i)
  773 #define NGI_HOOK(i)     _NGI_HOOK(i)
  774 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
  775 #define NGI_CLR_HOOK(i)   _NGI_CLR_HOOK(i)
  776 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
  777 #define NGI_CLR_NODE(i)   _NGI_CLR_NODE(i)
  778 
  779 #define NG_FREE_ITEM(item)      ng_free_item((item))
  780 #define SAVE_LINE(item)         do {} while (0)
  781 
  782 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  783 
  784 #define NGI_GET_M(i,m)                                                  \
  785         do {                                                            \
  786                 (m) = NGI_M(i);                                         \
  787                 _NGI_M(i) = NULL;                                       \
  788         } while (0)
  789 
  790 #define NGI_GET_MSG(i,m)                                                \
  791         do {                                                            \
  792                 (m) = NGI_MSG(i);                                       \
  793                 _NGI_MSG(i) = NULL;                                     \
  794         } while (0)
  795 
  796 #define NGI_GET_NODE(i,n)       /* YOU NOW HAVE THE REFERENCE */        \
  797         do {                                                            \
  798                 (n) = NGI_NODE(i);                                      \
  799                 _NGI_NODE(i) = NULL;                                    \
  800         } while (0)
  801 
  802 #define NGI_GET_HOOK(i,h)                                               \
  803         do {                                                            \
  804                 (h) = NGI_HOOK(i);                                      \
  805                 _NGI_HOOK(i) = NULL;                                    \
  806         } while (0)
  807 
  808         
  809 /**********************************************************************
  810 * Data macros.  Send, manipulate and free.
  811 **********************************************************************/
  812 /*
  813  * Assuming the data is already ok, just set the new address and send
  814  */
  815 #define NG_FWD_ITEM_HOOK(error, item, hook)                             \
  816         do {                                                            \
  817                 (error) =                                               \
  818                     ng_address_hook(NULL, (item), (hook), 0);   \
  819                 if (error == 0) {                                       \
  820                         SAVE_LINE(item);                                \
  821                         (error) = ng_snd_item((item), 0);               \
  822                 }                                                       \
  823                 (item) = NULL;                                          \
  824         } while (0)
  825 
  826 /*
  827  * Forward a data packet. Mbuf pointer is updated to new value. We
  828  * presume you dealt with the old one when you update it to the new one
  829  * (or it maybe the old one). We got a packet and possibly had to modify
  830  * the mbuf. You should probably use NGI_GET_M() if you are going to use
  831  * this too.
  832  */
  833 #define NG_FWD_NEW_DATA(error, item, hook, m)                           \
  834         do {                                                            \
  835                 NGI_M(item) = (m);                                      \
  836                 (m) = NULL;                                             \
  837                 NG_FWD_ITEM_HOOK(error, item, hook);                    \
  838         } while (0)
  839 
  840 /* Send a previously unpackaged mbuf. XXX: This should be called
  841  * NG_SEND_DATA in future, but this name is kept for compatibility
  842  * reasons.
  843  */
  844 #define NG_SEND_DATA_ONLY(error, hook, m)                               \
  845         do {                                                            \
  846                 item_p _item;                                           \
  847                 if ((_item = ng_package_data((m), NG_NOFLAGS))) {       \
  848                         NG_FWD_ITEM_HOOK(error, _item, hook);           \
  849                 } else {                                                \
  850                         (error) = ENOMEM;                               \
  851                 }                                                       \
  852                 (m) = NULL;                                             \
  853         } while (0)
  854 
  855 #define NG_SEND_DATA(error, hook, m, x) NG_SEND_DATA_ONLY(error, hook, m)
  856 
  857 #define NG_FREE_MSG(msg)                                                \
  858         do {                                                            \
  859                 if ((msg)) {                                            \
  860                         FREE((msg), M_NETGRAPH_MSG);                    \
  861                         (msg) = NULL;                                   \
  862                 }                                                       \
  863         } while (0)
  864 
  865 #define NG_FREE_M(m)                                                    \
  866         do {                                                            \
  867                 if ((m)) {                                              \
  868                         m_freem((m));                                   \
  869                         (m) = NULL;                                     \
  870                 }                                                       \
  871         } while (0)
  872 
  873 /*****************************************
  874 * Message macros
  875 *****************************************/
  876 
  877 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr)               \
  878         do {                                                            \
  879                 item_p _item;                                           \
  880                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  881                         (msg) = NULL;                                   \
  882                         (error) = ENOMEM;                               \
  883                         break;                                          \
  884                 }                                                       \
  885                 if (((error) = ng_address_hook((here), (_item),         \
  886                                         (hook), (retaddr))) == 0) {     \
  887                         SAVE_LINE(_item);                               \
  888                         (error) = ng_snd_item((_item), 0);              \
  889                 }                                                       \
  890                 (msg) = NULL;                                           \
  891         } while (0)
  892 
  893 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr)               \
  894         do {                                                            \
  895                 item_p _item;                                           \
  896                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  897                         (msg) = NULL;                                   \
  898                         (error) = ENOMEM;                               \
  899                         break;                                          \
  900                 }                                                       \
  901                 if (((error) = ng_address_path((here), (_item),         \
  902                                         (path), (retaddr))) == 0) {     \
  903                         SAVE_LINE(_item);                               \
  904                         (error) = ng_snd_item((_item), 0);              \
  905                 }                                                       \
  906                 (msg) = NULL;                                           \
  907         } while (0)
  908 
  909 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr)                   \
  910         do {                                                            \
  911                 item_p _item;                                           \
  912                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  913                         (msg) = NULL;                                   \
  914                         (error) = ENOMEM;                               \
  915                         break;                                          \
  916                 }                                                       \
  917                 if (((error) = ng_address_ID((here), (_item),           \
  918                                         (ID), (retaddr))) == 0) {       \
  919                         SAVE_LINE(_item);                               \
  920                         (error) = ng_snd_item((_item), 0);              \
  921                 }                                                       \
  922                 (msg) = NULL;                                           \
  923         } while (0)
  924 
  925 /*
  926  * Redirect the message to the next hop using the given hook.
  927  * ng_retarget_msg() frees the item if there is an error
  928  * and returns an error code.  It returns 0 on success.
  929  */
  930 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr)               \
  931         do {                                                            \
  932                 if (((error) = ng_address_hook((here), (item),          \
  933                                         (hook), (retaddr))) == 0) {     \
  934                         SAVE_LINE(item);                                \
  935                         (error) = ng_snd_item((item), 0);               \
  936                 }                                                       \
  937                 (item) = NULL;                                          \
  938         } while (0)
  939 
  940 /*
  941  * Send a queue item back to it's originator with a response message.
  942  * Assume original message was removed and freed separatly.
  943  */
  944 #define NG_RESPOND_MSG(error, here, item, resp)                         \
  945         do {                                                            \
  946                 if (resp) {                                             \
  947                         ng_ID_t _dest = NGI_RETADDR(item);              \
  948                         NGI_RETADDR(item) = 0;                          \
  949                         NGI_MSG(item) = resp;                           \
  950                         if ((ng_address_ID((here), (item),              \
  951                                         _dest, 0)) == 0) {              \
  952                                 SAVE_LINE(item);                        \
  953                                 (error) = ng_snd_item((item), NG_QUEUE);\
  954                         } else {                                        \
  955                                 NG_FREE_ITEM(item);                     \
  956                                 (error) = EINVAL;                       \
  957                         }                                               \
  958                 } else {                                                \
  959                         NG_FREE_ITEM(item);                             \
  960                 }                                                       \
  961                 (item) = NULL;                                          \
  962         } while (0)
  963 
  964 
  965 /***********************************************************************
  966  ******** Structures Definitions and Macros for defining a node  *******
  967  ***********************************************************************
  968  * 
  969  * Here we define the structures needed to actually define a new node
  970  * type.
  971  */
  972 
  973 /*
  974  * Command list -- each node type specifies the command that it knows
  975  * how to convert between ASCII and binary using an array of these.
  976  * The last element in the array must be a terminator with cookie=0.
  977  */
  978 
  979 struct ng_cmdlist {
  980         u_int32_t                       cookie;         /* command typecookie */
  981         int                             cmd;            /* command number */
  982         const char                      *name;          /* command name */
  983         const struct ng_parse_type      *mesgType;      /* args if !NGF_RESP */
  984         const struct ng_parse_type      *respType;      /* args if NGF_RESP */
  985 };
  986 
  987 /*
  988  * Structure of a node type
  989  * If data is sent to the "rcvdata()" entrypoint then the system
  990  * may decide to defer it until later by queing it with the normal netgraph
  991  * input queuing system.  This is decidde by the HK_QUEUE flag being set in
  992  * the flags word of the peer (receiving) hook. The dequeuing mechanism will
  993  * ensure it is not requeued again.
  994  * Note the input queueing system is to allow modules
  995  * to 'release the stack' or to pass data across spl layers.
  996  * The data will be redelivered as soon as the NETISR code runs
  997  * which may be almost immediatly.  A node may also do it's own queueing
  998  * for other reasons (e.g. device output queuing).
  999  */
 1000 struct ng_type {
 1001 
 1002         u_int32_t       version;        /* must equal NG_API_VERSION */
 1003         const char      *name;          /* Unique type name */
 1004         modeventhand_t  mod_event;      /* Module event handler (optional) */
 1005         ng_constructor_t *constructor;  /* Node constructor */
 1006         ng_rcvmsg_t     *rcvmsg;        /* control messages come here */
 1007         ng_close_t      *close;         /* warn about forthcoming shutdown */
 1008         ng_shutdown_t   *shutdown;      /* reset, and free resources */
 1009         ng_newhook_t    *newhook;       /* first notification of new hook */
 1010         ng_findhook_t   *findhook;      /* only if you have lots of hooks */
 1011         ng_connect_t    *connect;       /* final notification of new hook */
 1012         ng_rcvdata_t    *rcvdata;       /* data comes here */
 1013         ng_disconnect_t *disconnect;    /* notify on disconnect */
 1014 
 1015         const struct    ng_cmdlist *cmdlist;    /* commands we can convert */
 1016 
 1017         /* R/W data private to the base netgraph code DON'T TOUCH! */
 1018         LIST_ENTRY(ng_type) types;              /* linked list of all types */
 1019         int                 refs;               /* number of instances */
 1020 };
 1021 
 1022 /*
 1023  * Use the NETGRAPH_INIT() macro to link a node type into the
 1024  * netgraph system. This works for types compiled into the kernel
 1025  * as well as KLD modules. The first argument should be the type
 1026  * name (eg, echo) and the second a pointer to the type struct.
 1027  *
 1028  * If a different link time is desired, e.g., a device driver that
 1029  * needs to install its netgraph type before probing, use the
 1030  * NETGRAPH_INIT_ORDERED() macro instead. Deivce drivers probably
 1031  * want to use SI_SUB_DRIVERS instead of SI_SUB_PSEUDO.
 1032  */
 1033 
 1034 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order)        \
 1035 static moduledata_t ng_##typename##_mod = {                             \
 1036         "ng_" #typename,                                                \
 1037         ng_mod_event,                                                   \
 1038         (typestructp)                                                   \
 1039 };                                                                      \
 1040 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order);         \
 1041 MODULE_DEPEND(ng_##typename, netgraph,  NG_ABI_VERSION,                 \
 1042                                         NG_ABI_VERSION,                 \
 1043                                         NG_ABI_VERSION)
 1044 
 1045 #define NETGRAPH_INIT(tn, tp)                                           \
 1046         NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_ANY)
 1047 
 1048 /* Special malloc() type for netgraph structs and ctrl messages */
 1049 /* Only these two types should be visible to nodes */ 
 1050 MALLOC_DECLARE(M_NETGRAPH);
 1051 MALLOC_DECLARE(M_NETGRAPH_MSG);
 1052 
 1053 /* declare the base of the netgraph sysclt hierarchy */
 1054 /* but only if this file cares about sysctls */
 1055 #ifdef  SYSCTL_DECL
 1056 SYSCTL_DECL(_net_graph);
 1057 #endif
 1058 
 1059 /*
 1060  * Methods that the nodes can use.
 1061  * Many of these methods should usually NOT be used directly but via 
 1062  * Macros above.
 1063  */
 1064 int     ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
 1065 int     ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
 1066 int     ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
 1067 int     ng_bypass(hook_p hook1, hook_p hook2);
 1068 hook_p  ng_findhook(node_p node, const char *name);
 1069 struct  ng_type *ng_findtype(const char *type);
 1070 int     ng_make_node_common(struct ng_type *typep, node_p *nodep);
 1071 int     ng_name_node(node_p node, const char *name);
 1072 int     ng_newtype(struct ng_type *tp);
 1073 ng_ID_t ng_node2ID(node_p node);
 1074 item_p  ng_package_data(struct mbuf *m, int flags);
 1075 item_p  ng_package_msg(struct ng_mesg *msg, int flags);
 1076 item_p  ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
 1077 void    ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
 1078 int     ng_rmhook_self(hook_p hook);    /* if a node wants to kill a hook */
 1079 int     ng_rmnode_self(node_p here);    /* if a node wants to suicide */
 1080 int     ng_rmtype(struct ng_type *tp);
 1081 int     ng_snd_item(item_p item, int queue);
 1082 int     ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn,
 1083         void *arg1, int arg2, int flags);
 1084 #define ng_send_fn(node, hook, fn, arg1, arg2) \
 1085         ng_send_fn1(node, hook, fn, arg1, arg2, NG_NOFLAGS)
 1086 int     ng_uncallout(struct callout *c, node_p node);
 1087 int     ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
 1088             ng_item_fn *fn, void * arg1, int arg2);
 1089 #define ng_callout_init(c)      callout_init(c, CALLOUT_MPSAFE)
 1090 
 1091 /* Flags for netgraph functions. */
 1092 #define NG_NOFLAGS      0x00000000      /* no special options */
 1093 #define NG_QUEUE        0x00000001      /* enqueue item, don't dispatch */
 1094 #define NG_WAITOK       0x00000002      /* use M_WAITOK, etc. */
 1095 #define NG_PROGRESS     0x00000004      /* return EINPROGRESS if queued */
 1096 
 1097 /*
 1098  * prototypes the user should DEFINITELY not use directly
 1099  */
 1100 void    ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
 1101 int     ng_mod_event(module_t mod, int what, void *arg);
 1102 
 1103 /*
 1104  * Tag definitions and constants
 1105  */
 1106 
 1107 #define NG_TAG_PRIO     1
 1108 
 1109 struct ng_tag_prio {
 1110         struct m_tag    tag;
 1111         char    priority;
 1112         char    discardability;
 1113 };
 1114 
 1115 #define NG_PRIO_CUTOFF          32
 1116 #define NG_PRIO_LINKSTATE       64
 1117 
 1118 /* Macros and declarations to keep compatibility with metadata, which
 1119  * is obsoleted now. To be deleted.
 1120  */
 1121 typedef void *meta_p;
 1122 #define _NGI_META(i)    NULL
 1123 #define NGI_META(i)     NULL
 1124 #define NG_FREE_META(meta)
 1125 #define NGI_GET_META(i,m)
 1126 #define ng_copy_meta(meta) NULL
 1127 
 1128 #endif /* _NETGRAPH_NETGRAPH_H_ */

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