The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/netgraph.h

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    1 /*
    2  * netgraph.h
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Julian Elischer <julian@freebsd.org>
   39  *
   40  * $FreeBSD: releng/9.0/sys/netgraph/netgraph.h 223768 2011-07-04 20:50:09Z glebius $
   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 #include <sys/refcount.h>
   57 
   58 #ifdef HAVE_KERNEL_OPTION_HEADERS
   59 #include "opt_netgraph.h"
   60 #endif
   61 
   62 /* debugging options */
   63 #define NG_SEPARATE_MALLOC      /* make modules use their own malloc types */
   64 
   65 /*
   66  * This defines the in-kernel binary interface version.
   67  * It is possible to change this but leave the external message
   68  * API the same. Each type also has it's own cookies for versioning as well.
   69  * Change it for NETGRAPH_DEBUG version so we cannot mix debug and non debug
   70  * modules.
   71  */
   72 #define _NG_ABI_VERSION 12
   73 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
   74 #define NG_ABI_VERSION  (_NG_ABI_VERSION + 0x10000)
   75 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
   76 #define NG_ABI_VERSION  _NG_ABI_VERSION
   77 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
   78 
   79 
   80 /*
   81  * Forward references for the basic structures so we can
   82  * define the typedefs and use them in the structures themselves.
   83  */
   84 struct ng_hook ;
   85 struct ng_node ;
   86 struct ng_item ;
   87 typedef struct ng_item *item_p;
   88 typedef struct ng_node *node_p;
   89 typedef struct ng_hook *hook_p;
   90 
   91 /* node method definitions */
   92 typedef int     ng_constructor_t(node_p node);
   93 typedef int     ng_close_t(node_p node);
   94 typedef int     ng_shutdown_t(node_p node);
   95 typedef int     ng_newhook_t(node_p node, hook_p hook, const char *name);
   96 typedef hook_p  ng_findhook_t(node_p node, const char *name);
   97 typedef int     ng_connect_t(hook_p hook);
   98 typedef int     ng_rcvmsg_t(node_p node, item_p item, hook_p lasthook);
   99 typedef int     ng_rcvdata_t(hook_p hook, item_p item);
  100 typedef int     ng_disconnect_t(hook_p hook);
  101 typedef int     ng_rcvitem (node_p node, hook_p hook, item_p item);
  102 
  103 /***********************************************************************
  104  ***************** Hook Structure and Methods **************************
  105  ***********************************************************************
  106  *
  107  * Structure of a hook
  108  */
  109 struct ng_hook {
  110         char    hk_name[NG_HOOKSIZ];    /* what this node knows this link as */
  111         void   *hk_private;             /* node dependant ID for this hook */
  112         int     hk_flags;               /* info about this hook/link */
  113         int     hk_type;                /* tbd: hook data link type */
  114         struct  ng_hook *hk_peer;       /* the other end of this link */
  115         struct  ng_node *hk_node;       /* The node this hook is attached to */
  116         LIST_ENTRY(ng_hook) hk_hooks;   /* linked list of all hooks on node */
  117         ng_rcvmsg_t     *hk_rcvmsg;     /* control messages come here */
  118         ng_rcvdata_t    *hk_rcvdata;    /* data comes here */
  119         int     hk_refs;                /* dont actually free this till 0 */
  120 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  121 #define HK_MAGIC 0x78573011
  122         int     hk_magic;
  123         char    *lastfile;
  124         int     lastline;
  125         SLIST_ENTRY(ng_hook)      hk_all;               /* all existing items */
  126 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  127 };
  128 /* Flags for a hook */
  129 #define HK_INVALID              0x0001  /* don't trust it! */
  130 #define HK_QUEUE                0x0002  /* queue for later delivery */
  131 #define HK_FORCE_WRITER         0x0004  /* Incoming data queued as a writer */
  132 #define HK_DEAD                 0x0008  /* This is the dead hook.. don't free */
  133 #define HK_HI_STACK             0x0010  /* Hook has hi stack usage */
  134 #define HK_TO_INBOUND           0x0020  /* Hook on ntw. stack inbound path. */
  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)      refcount_acquire(&(hook)->hk_refs)
  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_SET_TO_INBOUND(hook)                           \
  156                 do { hook->hk_flags |= HK_TO_INBOUND; } while (0)
  157 #define _NG_HOOK_HI_STACK(hook) do { hook->hk_flags |= HK_HI_STACK; } while (0)
  158 
  159 /* Some shortcuts */
  160 #define NG_PEER_NODE(hook)      NG_HOOK_NODE(NG_HOOK_PEER(hook))
  161 #define NG_PEER_HOOK_NAME(hook) NG_HOOK_NAME(NG_HOOK_PEER(hook))
  162 #define NG_PEER_NODE_NAME(hook) NG_NODE_NAME(NG_PEER_NODE(hook))
  163 
  164 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  165 #define _NN_ __FILE__,__LINE__
  166 void    dumphook (hook_p hook, char *file, int line);
  167 static __inline void    _chkhook(hook_p hook, char *file, int line);
  168 static __inline void    _ng_hook_ref(hook_p hook, char * file, int line);
  169 static __inline char *  _ng_hook_name(hook_p hook, char * file, int line);
  170 static __inline void    _ng_hook_unref(hook_p hook, char * file, int line);
  171 static __inline void    _ng_hook_set_private(hook_p hook,
  172                                 void * val, char * file, int line);
  173 static __inline void    _ng_hook_set_rcvmsg(hook_p hook,
  174                                 ng_rcvmsg_t *val, char * file, int line);
  175 static __inline void    _ng_hook_set_rcvdata(hook_p hook,
  176                                 ng_rcvdata_t *val, char * file, int line);
  177 static __inline void *  _ng_hook_private(hook_p hook, char * file, int line);
  178 static __inline int     _ng_hook_not_valid(hook_p hook, char * file, int line);
  179 static __inline int     _ng_hook_is_valid(hook_p hook, char * file, int line);
  180 static __inline node_p  _ng_hook_node(hook_p hook, char * file, int line);
  181 static __inline hook_p  _ng_hook_peer(hook_p hook, char * file, int line);
  182 static __inline void    _ng_hook_force_writer(hook_p hook, char * file,
  183                                 int line);
  184 static __inline void    _ng_hook_force_queue(hook_p hook, char * file,
  185                                 int line);
  186 static __inline void    _ng_hook_set_to_inbound(hook_p hook, char * file,
  187                                 int line);
  188 
  189 static __inline void
  190 _chkhook(hook_p hook, char *file, int line)
  191 {
  192         if (hook->hk_magic != HK_MAGIC) {
  193                 printf("Accessing freed hook ");
  194                 dumphook(hook, file, line);
  195         }
  196         hook->lastline = line;
  197         hook->lastfile = file;
  198 }
  199 
  200 static __inline void
  201 _ng_hook_ref(hook_p hook, char * file, int line)
  202 {
  203         _chkhook(hook, file, line);
  204         _NG_HOOK_REF(hook);
  205 }
  206 
  207 static __inline char *
  208 _ng_hook_name(hook_p hook, char * file, int line)
  209 {
  210         _chkhook(hook, file, line);
  211         return (_NG_HOOK_NAME(hook));
  212 }
  213 
  214 static __inline void
  215 _ng_hook_unref(hook_p hook, char * file, int line)
  216 {
  217         _chkhook(hook, file, line);
  218         _NG_HOOK_UNREF(hook);
  219 }
  220 
  221 static __inline void
  222 _ng_hook_set_private(hook_p hook, void *val, char * file, int line)
  223 {
  224         _chkhook(hook, file, line);
  225         _NG_HOOK_SET_PRIVATE(hook, val);
  226 }
  227 
  228 static __inline void
  229 _ng_hook_set_rcvmsg(hook_p hook, ng_rcvmsg_t *val, char * file, int line)
  230 {
  231         _chkhook(hook, file, line);
  232         _NG_HOOK_SET_RCVMSG(hook, val);
  233 }
  234 
  235 static __inline void
  236 _ng_hook_set_rcvdata(hook_p hook, ng_rcvdata_t *val, char * file, int line)
  237 {
  238         _chkhook(hook, file, line);
  239         _NG_HOOK_SET_RCVDATA(hook, val);
  240 }
  241 
  242 static __inline void *
  243 _ng_hook_private(hook_p hook, char * file, int line)
  244 {
  245         _chkhook(hook, file, line);
  246         return (_NG_HOOK_PRIVATE(hook));
  247 }
  248 
  249 static __inline int
  250 _ng_hook_not_valid(hook_p hook, char * file, int line)
  251 {
  252         _chkhook(hook, file, line);
  253         return (_NG_HOOK_NOT_VALID(hook));
  254 }
  255 
  256 static __inline int
  257 _ng_hook_is_valid(hook_p hook, char * file, int line)
  258 {
  259         _chkhook(hook, file, line);
  260         return (_NG_HOOK_IS_VALID(hook));
  261 }
  262 
  263 static __inline node_p
  264 _ng_hook_node(hook_p hook, char * file, int line)
  265 {
  266         _chkhook(hook, file, line);
  267         return (_NG_HOOK_NODE(hook));
  268 }
  269 
  270 static __inline hook_p
  271 _ng_hook_peer(hook_p hook, char * file, int line)
  272 {
  273         _chkhook(hook, file, line);
  274         return (_NG_HOOK_PEER(hook));
  275 }
  276 
  277 static __inline void
  278 _ng_hook_force_writer(hook_p hook, char * file, int line)
  279 {
  280         _chkhook(hook, file, line);
  281         _NG_HOOK_FORCE_WRITER(hook);
  282 }
  283 
  284 static __inline void
  285 _ng_hook_force_queue(hook_p hook, char * file, int line)
  286 {
  287         _chkhook(hook, file, line);
  288         _NG_HOOK_FORCE_QUEUE(hook);
  289 }
  290 
  291 static __inline void
  292 _ng_hook_set_to_inbound(hook_p hook, char * file, int line)
  293 {
  294         _chkhook(hook, file, line);
  295         _NG_HOOK_SET_TO_INBOUND(hook);
  296 }
  297 
  298 static __inline void
  299 _ng_hook_hi_stack(hook_p hook, char * file, int line)
  300 {
  301         _chkhook(hook, file, line);
  302         _NG_HOOK_HI_STACK(hook);
  303 }
  304 
  305 
  306 #define NG_HOOK_REF(hook)               _ng_hook_ref(hook, _NN_)
  307 #define NG_HOOK_NAME(hook)              _ng_hook_name(hook, _NN_)
  308 #define NG_HOOK_UNREF(hook)             _ng_hook_unref(hook, _NN_)
  309 #define NG_HOOK_SET_PRIVATE(hook, val)  _ng_hook_set_private(hook, val, _NN_)
  310 #define NG_HOOK_SET_RCVMSG(hook, val)   _ng_hook_set_rcvmsg(hook, val, _NN_)
  311 #define NG_HOOK_SET_RCVDATA(hook, val)  _ng_hook_set_rcvdata(hook, val, _NN_)
  312 #define NG_HOOK_PRIVATE(hook)           _ng_hook_private(hook, _NN_)
  313 #define NG_HOOK_NOT_VALID(hook)         _ng_hook_not_valid(hook, _NN_)
  314 #define NG_HOOK_IS_VALID(hook)          _ng_hook_is_valid(hook, _NN_)
  315 #define NG_HOOK_NODE(hook)              _ng_hook_node(hook, _NN_)
  316 #define NG_HOOK_PEER(hook)              _ng_hook_peer(hook, _NN_)
  317 #define NG_HOOK_FORCE_WRITER(hook)      _ng_hook_force_writer(hook, _NN_)
  318 #define NG_HOOK_FORCE_QUEUE(hook)       _ng_hook_force_queue(hook, _NN_)
  319 #define NG_HOOK_SET_TO_INBOUND(hook)    _ng_hook_set_to_inbound(hook, _NN_)
  320 #define NG_HOOK_HI_STACK(hook)          _ng_hook_hi_stack(hook, _NN_)
  321 
  322 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  323 
  324 #define NG_HOOK_REF(hook)               _NG_HOOK_REF(hook)
  325 #define NG_HOOK_NAME(hook)              _NG_HOOK_NAME(hook)
  326 #define NG_HOOK_UNREF(hook)             _NG_HOOK_UNREF(hook)
  327 #define NG_HOOK_SET_PRIVATE(hook, val)  _NG_HOOK_SET_PRIVATE(hook, val)
  328 #define NG_HOOK_SET_RCVMSG(hook, val)   _NG_HOOK_SET_RCVMSG(hook, val)
  329 #define NG_HOOK_SET_RCVDATA(hook, val)  _NG_HOOK_SET_RCVDATA(hook, val)
  330 #define NG_HOOK_PRIVATE(hook)           _NG_HOOK_PRIVATE(hook)
  331 #define NG_HOOK_NOT_VALID(hook)         _NG_HOOK_NOT_VALID(hook)
  332 #define NG_HOOK_IS_VALID(hook)          _NG_HOOK_IS_VALID(hook)
  333 #define NG_HOOK_NODE(hook)              _NG_HOOK_NODE(hook)
  334 #define NG_HOOK_PEER(hook)              _NG_HOOK_PEER(hook)
  335 #define NG_HOOK_FORCE_WRITER(hook)      _NG_HOOK_FORCE_WRITER(hook)
  336 #define NG_HOOK_FORCE_QUEUE(hook)       _NG_HOOK_FORCE_QUEUE(hook)
  337 #define NG_HOOK_SET_TO_INBOUND(hook)    _NG_HOOK_SET_TO_INBOUND(hook)
  338 #define NG_HOOK_HI_STACK(hook)          _NG_HOOK_HI_STACK(hook)
  339 
  340 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  341 
  342 /***********************************************************************
  343  ***************** Node Structure and Methods **************************
  344  ***********************************************************************
  345  * Structure of a node
  346  * including the eembedded queue structure.
  347  *
  348  * The structure for queueing Netgraph request items
  349  * embedded in the node structure
  350  */
  351 struct ng_queue {
  352         u_int           q_flags;        /* Current r/w/q lock flags */
  353         u_int           q_flags2;       /* Other queue flags */
  354         struct mtx      q_mtx;
  355         STAILQ_ENTRY(ng_node)   q_work; /* nodes with work to do */
  356         STAILQ_HEAD(, ng_item)  queue;  /* actually items queue */
  357 };
  358 
  359 struct ng_node {
  360         char    nd_name[NG_NODESIZ];    /* optional globally unique name */
  361         struct  ng_type *nd_type;       /* the installed 'type' */
  362         int     nd_flags;               /* see below for bit definitions */
  363         int     nd_numhooks;            /* number of hooks */
  364         void   *nd_private;             /* node type dependant node ID */
  365         ng_ID_t nd_ID;                  /* Unique per node */
  366         LIST_HEAD(hooks, ng_hook) nd_hooks;     /* linked list of node hooks */
  367         LIST_ENTRY(ng_node)       nd_nodes;     /* linked list of all nodes */
  368         LIST_ENTRY(ng_node)       nd_idnodes;   /* ID hash collision list */
  369         struct  ng_queue          nd_input_queue; /* input queue for locking */
  370         int     nd_refs;                /* # of references to this node */
  371         struct  vnet             *nd_vnet;      /* network stack instance */
  372 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  373 #define ND_MAGIC 0x59264837
  374         int     nd_magic;
  375         char    *lastfile;
  376         int     lastline;
  377         SLIST_ENTRY(ng_node)      nd_all;       /* all existing nodes */
  378 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  379 };
  380 
  381 /* Flags for a node */
  382 #define NGF_INVALID     0x00000001      /* free when refs go to 0 */
  383 #define NG_INVALID      NGF_INVALID     /* compat for old code */
  384 #define NGF_FORCE_WRITER        0x00000004      /* Never multithread this node */
  385 #define NG_FORCE_WRITER NGF_FORCE_WRITER /* compat for old code */
  386 #define NGF_CLOSING     0x00000008      /* ng_rmnode() at work */
  387 #define NG_CLOSING      NGF_CLOSING     /* compat for old code */
  388 #define NGF_REALLY_DIE  0x00000010      /* "persistent" node is unloading */
  389 #define NG_REALLY_DIE   NGF_REALLY_DIE  /* compat for old code */
  390 #define NGF_HI_STACK    0x00000020      /* node has hi stack usage */
  391 #define NGF_TYPE1       0x10000000      /* reserved for type specific storage */
  392 #define NGF_TYPE2       0x20000000      /* reserved for type specific storage */
  393 #define NGF_TYPE3       0x40000000      /* reserved for type specific storage */
  394 #define NGF_TYPE4       0x80000000      /* reserved for type specific storage */
  395 
  396 /*
  397  * Public methods for nodes.
  398  * If you can't do it with these you probably shouldn't be doing it.
  399  */
  400 void    ng_unref_node(node_p node); /* don't move this */
  401 #define _NG_NODE_NAME(node)     ((node)->nd_name + 0)
  402 #define _NG_NODE_HAS_NAME(node) ((node)->nd_name[0] + 0)
  403 #define _NG_NODE_ID(node)       ((node)->nd_ID + 0)
  404 #define _NG_NODE_REF(node)      refcount_acquire(&(node)->nd_refs)
  405 #define _NG_NODE_UNREF(node)    ng_unref_node(node)
  406 #define _NG_NODE_SET_PRIVATE(node, val) do {(node)->nd_private = val;} while (0)
  407 #define _NG_NODE_PRIVATE(node)  ((node)->nd_private)
  408 #define _NG_NODE_IS_VALID(node) (!((node)->nd_flags & NGF_INVALID))
  409 #define _NG_NODE_NOT_VALID(node)        ((node)->nd_flags & NGF_INVALID)
  410 #define _NG_NODE_NUMHOOKS(node) ((node)->nd_numhooks + 0) /* rvalue */
  411 #define _NG_NODE_FORCE_WRITER(node)                                     \
  412         do{ node->nd_flags |= NGF_FORCE_WRITER; }while (0)
  413 #define _NG_NODE_HI_STACK(node)                                         \
  414         do{ node->nd_flags |= NGF_HI_STACK; }while (0)
  415 #define _NG_NODE_REALLY_DIE(node)                                       \
  416         do{ node->nd_flags |= (NGF_REALLY_DIE|NGF_INVALID); }while (0)
  417 #define _NG_NODE_REVIVE(node) \
  418         do { node->nd_flags &= ~NGF_INVALID; } while (0)
  419 /*
  420  * The hook iterator.
  421  * This macro will call a function of type ng_fn_eachhook for each
  422  * hook attached to the node. If the function returns 0, then the
  423  * iterator will stop and return a pointer to the hook that returned 0.
  424  */
  425 typedef int     ng_fn_eachhook(hook_p hook, void* arg);
  426 #define _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                   \
  427         do {                                                            \
  428                 hook_p _hook;                                           \
  429                 (rethook) = NULL;                                       \
  430                 LIST_FOREACH(_hook, &((node)->nd_hooks), hk_hooks) {    \
  431                         if ((fn)(_hook, arg) == 0) {                    \
  432                                 (rethook) = _hook;                      \
  433                                 break;                                  \
  434                         }                                               \
  435                 }                                                       \
  436         } while (0)
  437 
  438 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  439 void    dumpnode(node_p node, char *file, int line);
  440 static __inline void _chknode(node_p node, char *file, int line);
  441 static __inline char * _ng_node_name(node_p node, char *file, int line);
  442 static __inline int _ng_node_has_name(node_p node, char *file, int line);
  443 static __inline ng_ID_t _ng_node_id(node_p node, char *file, int line);
  444 static __inline void _ng_node_ref(node_p node, char *file, int line);
  445 static __inline void _ng_node_unref(node_p node, char *file, int line);
  446 static __inline void _ng_node_set_private(node_p node, void * val,
  447                                                         char *file, int line);
  448 static __inline void * _ng_node_private(node_p node, char *file, int line);
  449 static __inline int _ng_node_is_valid(node_p node, char *file, int line);
  450 static __inline int _ng_node_not_valid(node_p node, char *file, int line);
  451 static __inline int _ng_node_numhooks(node_p node, char *file, int line);
  452 static __inline void _ng_node_force_writer(node_p node, char *file, int line);
  453 static __inline hook_p _ng_node_foreach_hook(node_p node,
  454                         ng_fn_eachhook *fn, void *arg, char *file, int line);
  455 static __inline void _ng_node_revive(node_p node, char *file, int line);
  456 
  457 static __inline void
  458 _chknode(node_p node, char *file, int line)
  459 {
  460         if (node->nd_magic != ND_MAGIC) {
  461                 printf("Accessing freed node ");
  462                 dumpnode(node, file, line);
  463         }
  464         node->lastline = line;
  465         node->lastfile = file;
  466 }
  467 
  468 static __inline char *
  469 _ng_node_name(node_p node, char *file, int line)
  470 {
  471         _chknode(node, file, line);
  472         return(_NG_NODE_NAME(node));
  473 }
  474 
  475 static __inline int
  476 _ng_node_has_name(node_p node, char *file, int line)
  477 {
  478         _chknode(node, file, line);
  479         return(_NG_NODE_HAS_NAME(node));
  480 }
  481 
  482 static __inline ng_ID_t
  483 _ng_node_id(node_p node, char *file, int line)
  484 {
  485         _chknode(node, file, line);
  486         return(_NG_NODE_ID(node));
  487 }
  488 
  489 static __inline void
  490 _ng_node_ref(node_p node, char *file, int line)
  491 {
  492         _chknode(node, file, line);
  493         _NG_NODE_REF(node);
  494 }
  495 
  496 static __inline void
  497 _ng_node_unref(node_p node, char *file, int line)
  498 {
  499         _chknode(node, file, line);
  500         _NG_NODE_UNREF(node);
  501 }
  502 
  503 static __inline void
  504 _ng_node_set_private(node_p node, void * val, char *file, int line)
  505 {
  506         _chknode(node, file, line);
  507         _NG_NODE_SET_PRIVATE(node, val);
  508 }
  509 
  510 static __inline void *
  511 _ng_node_private(node_p node, char *file, int line)
  512 {
  513         _chknode(node, file, line);
  514         return (_NG_NODE_PRIVATE(node));
  515 }
  516 
  517 static __inline int
  518 _ng_node_is_valid(node_p node, char *file, int line)
  519 {
  520         _chknode(node, file, line);
  521         return(_NG_NODE_IS_VALID(node));
  522 }
  523 
  524 static __inline int
  525 _ng_node_not_valid(node_p node, char *file, int line)
  526 {
  527         _chknode(node, file, line);
  528         return(_NG_NODE_NOT_VALID(node));
  529 }
  530 
  531 static __inline int
  532 _ng_node_numhooks(node_p node, char *file, int line)
  533 {
  534         _chknode(node, file, line);
  535         return(_NG_NODE_NUMHOOKS(node));
  536 }
  537 
  538 static __inline void
  539 _ng_node_force_writer(node_p node, char *file, int line)
  540 {
  541         _chknode(node, file, line);
  542         _NG_NODE_FORCE_WRITER(node);
  543 }
  544 
  545 static __inline void
  546 _ng_node_hi_stack(node_p node, char *file, int line)
  547 {
  548         _chknode(node, file, line);
  549         _NG_NODE_HI_STACK(node);
  550 }
  551 
  552 static __inline void
  553 _ng_node_really_die(node_p node, char *file, int line)
  554 {
  555         _chknode(node, file, line);
  556         _NG_NODE_REALLY_DIE(node);
  557 }
  558 
  559 static __inline void
  560 _ng_node_revive(node_p node, char *file, int line)
  561 {
  562         _chknode(node, file, line);
  563         _NG_NODE_REVIVE(node);
  564 }
  565 
  566 static __inline hook_p
  567 _ng_node_foreach_hook(node_p node, ng_fn_eachhook *fn, void *arg,
  568                                                 char *file, int line)
  569 {
  570         hook_p hook;
  571         _chknode(node, file, line);
  572         _NG_NODE_FOREACH_HOOK(node, fn, arg, hook);
  573         return (hook);
  574 }
  575 
  576 #define NG_NODE_NAME(node)              _ng_node_name(node, _NN_)       
  577 #define NG_NODE_HAS_NAME(node)          _ng_node_has_name(node, _NN_)   
  578 #define NG_NODE_ID(node)                _ng_node_id(node, _NN_)
  579 #define NG_NODE_REF(node)               _ng_node_ref(node, _NN_)
  580 #define NG_NODE_UNREF(node)             _ng_node_unref(node, _NN_)
  581 #define NG_NODE_SET_PRIVATE(node, val)  _ng_node_set_private(node, val, _NN_)
  582 #define NG_NODE_PRIVATE(node)           _ng_node_private(node, _NN_)
  583 #define NG_NODE_IS_VALID(node)          _ng_node_is_valid(node, _NN_)
  584 #define NG_NODE_NOT_VALID(node)         _ng_node_not_valid(node, _NN_)
  585 #define NG_NODE_FORCE_WRITER(node)      _ng_node_force_writer(node, _NN_)
  586 #define NG_NODE_HI_STACK(node)          _ng_node_hi_stack(node, _NN_)
  587 #define NG_NODE_REALLY_DIE(node)        _ng_node_really_die(node, _NN_)
  588 #define NG_NODE_NUMHOOKS(node)          _ng_node_numhooks(node, _NN_)
  589 #define NG_NODE_REVIVE(node)            _ng_node_revive(node, _NN_)
  590 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                          \
  591         do {                                                                  \
  592                 rethook = _ng_node_foreach_hook(node, fn, (void *)arg, _NN_); \
  593         } while (0)
  594 
  595 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  596 
  597 #define NG_NODE_NAME(node)              _NG_NODE_NAME(node)     
  598 #define NG_NODE_HAS_NAME(node)          _NG_NODE_HAS_NAME(node) 
  599 #define NG_NODE_ID(node)                _NG_NODE_ID(node)       
  600 #define NG_NODE_REF(node)               _NG_NODE_REF(node)      
  601 #define NG_NODE_UNREF(node)             _NG_NODE_UNREF(node)    
  602 #define NG_NODE_SET_PRIVATE(node, val)  _NG_NODE_SET_PRIVATE(node, val) 
  603 #define NG_NODE_PRIVATE(node)           _NG_NODE_PRIVATE(node)  
  604 #define NG_NODE_IS_VALID(node)          _NG_NODE_IS_VALID(node) 
  605 #define NG_NODE_NOT_VALID(node)         _NG_NODE_NOT_VALID(node)        
  606 #define NG_NODE_FORCE_WRITER(node)      _NG_NODE_FORCE_WRITER(node)
  607 #define NG_NODE_HI_STACK(node)          _NG_NODE_HI_STACK(node)
  608 #define NG_NODE_REALLY_DIE(node)        _NG_NODE_REALLY_DIE(node)
  609 #define NG_NODE_NUMHOOKS(node)          _NG_NODE_NUMHOOKS(node) 
  610 #define NG_NODE_REVIVE(node)            _NG_NODE_REVIVE(node)
  611 #define NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)                    \
  612                 _NG_NODE_FOREACH_HOOK(node, fn, arg, rethook)
  613 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  614 
  615 /***********************************************************************
  616  ************* Node Queue and Item Structures and Methods **************
  617  ***********************************************************************
  618  *
  619  */
  620 typedef void    ng_item_fn(node_p node, hook_p hook, void *arg1, int arg2);
  621 typedef int     ng_item_fn2(node_p node, struct ng_item *item, hook_p hook);
  622 typedef void    ng_apply_t(void *context, int error);
  623 struct ng_apply_info {
  624         ng_apply_t      *apply;
  625         void            *context;
  626         int             refs;
  627         int             error;
  628 };
  629 struct ng_item {
  630         u_long  el_flags;
  631         STAILQ_ENTRY(ng_item)   el_next;
  632         node_p  el_dest; /* The node it will be applied against (or NULL) */
  633         hook_p  el_hook; /* Entering hook. Optional in Control messages */
  634         union {
  635                 struct mbuf     *da_m;
  636                 struct {
  637                         struct ng_mesg  *msg_msg;
  638                         ng_ID_t         msg_retaddr;
  639                 } msg;
  640                 struct {
  641                         union {
  642                                 ng_item_fn      *fn_fn;
  643                                 ng_item_fn2     *fn_fn2;
  644                         } fn_fn;
  645                         void            *fn_arg1;
  646                         int             fn_arg2;
  647                 } fn;
  648         } body;
  649         /*
  650          * Optional callback called when item is being applied,
  651          * and its context.
  652          */
  653         struct ng_apply_info    *apply;
  654         u_int   depth;
  655 #ifdef  NETGRAPH_DEBUG /*----------------------------------------------*/
  656         char *lastfile;
  657         int  lastline;
  658         TAILQ_ENTRY(ng_item)      all;          /* all existing items */
  659 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  660 };
  661 
  662 #define NGQF_TYPE       0x03            /* MASK of content definition */
  663 #define NGQF_MESG       0x00            /* the queue element is a message */
  664 #define NGQF_DATA       0x01            /* the queue element is data */
  665 #define NGQF_FN         0x02            /* the queue element is a function */
  666 #define NGQF_FN2        0x03            /* the queue element is a new function */
  667 
  668 #define NGQF_RW         0x04            /* MASK for wanted queue mode */
  669 #define NGQF_READER     0x04            /* wants to be a reader */
  670 #define NGQF_WRITER     0x00            /* wants to be a writer */
  671 
  672 #define NGQF_QMODE      0x08            /* MASK for how it was queued */
  673 #define NGQF_QREADER    0x08            /* was queued as a reader */
  674 #define NGQF_QWRITER    0x00            /* was queued as a writer */
  675 
  676 /*
  677  * Get the mbuf (etc) out of an item.
  678  * Sets the value in the item to NULL in case we need to call NG_FREE_ITEM()
  679  * with it, (to avoid freeing the things twice).
  680  * If you don't want to zero out the item then realise that the
  681  * item still owns it.
  682  * Retaddr is different. There are no references on that. It's just a number.
  683  * The debug versions must be either all used everywhere or not at all.
  684  */
  685 
  686 #define _NGI_M(i) ((i)->body.da_m)
  687 #define _NGI_MSG(i) ((i)->body.msg.msg_msg)
  688 #define _NGI_RETADDR(i) ((i)->body.msg.msg_retaddr)
  689 #define _NGI_FN(i) ((i)->body.fn.fn_fn.fn_fn)
  690 #define _NGI_FN2(i) ((i)->body.fn.fn_fn.fn_fn2)
  691 #define _NGI_ARG1(i) ((i)->body.fn.fn_arg1)
  692 #define _NGI_ARG2(i) ((i)->body.fn.fn_arg2)
  693 #define _NGI_NODE(i) ((i)->el_dest)
  694 #define _NGI_HOOK(i) ((i)->el_hook)
  695 #define _NGI_SET_HOOK(i,h) do { _NGI_HOOK(i) = h; h = NULL;} while (0)
  696 #define _NGI_CLR_HOOK(i)   do {                                         \
  697                 hook_p _hook = _NGI_HOOK(i);                            \
  698                 if (_hook) {                                            \
  699                         _NG_HOOK_UNREF(_hook);                          \
  700                         _NGI_HOOK(i) = NULL;                            \
  701                 }                                                       \
  702         } while (0)
  703 #define _NGI_SET_NODE(i,n) do { _NGI_NODE(i) = n; n = NULL;} while (0)
  704 #define _NGI_CLR_NODE(i)   do {                                         \
  705                 node_p _node = _NGI_NODE(i);                            \
  706                 if (_node) {                                            \
  707                         _NG_NODE_UNREF(_node);                          \
  708                         _NGI_NODE(i) = NULL;                            \
  709                 }                                                       \
  710         } while (0)
  711 
  712 #ifdef NETGRAPH_DEBUG /*----------------------------------------------*/
  713 void                            dumpitem(item_p item, char *file, int line);
  714 static __inline void            _ngi_check(item_p item, char *file, int line) ;
  715 static __inline struct mbuf **  _ngi_m(item_p item, char *file, int line) ;
  716 static __inline ng_ID_t *       _ngi_retaddr(item_p item, char *file, int line);
  717 static __inline struct ng_mesg ** _ngi_msg(item_p item, char *file, int line) ;
  718 static __inline ng_item_fn **   _ngi_fn(item_p item, char *file, int line) ;
  719 static __inline ng_item_fn2 **  _ngi_fn2(item_p item, char *file, int line) ;
  720 static __inline void **         _ngi_arg1(item_p item, char *file, int line) ;
  721 static __inline int *           _ngi_arg2(item_p item, char *file, int line) ;
  722 static __inline node_p          _ngi_node(item_p item, char *file, int line);
  723 static __inline hook_p          _ngi_hook(item_p item, char *file, int line);
  724 
  725 static __inline void
  726 _ngi_check(item_p item, char *file, int line)
  727 {
  728         (item)->lastline = line;
  729         (item)->lastfile = file;
  730 }
  731 
  732 static __inline struct mbuf **
  733 _ngi_m(item_p item, char *file, int line)
  734 {
  735         _ngi_check(item, file, line);
  736         return (&_NGI_M(item));
  737 }
  738 
  739 static __inline struct ng_mesg **
  740 _ngi_msg(item_p item, char *file, int line)
  741 {
  742         _ngi_check(item, file, line);
  743         return (&_NGI_MSG(item));
  744 }
  745 
  746 static __inline ng_ID_t *
  747 _ngi_retaddr(item_p item, char *file, int line)
  748 {
  749         _ngi_check(item, file, line);
  750         return (&_NGI_RETADDR(item));
  751 }
  752 
  753 static __inline ng_item_fn **
  754 _ngi_fn(item_p item, char *file, int line)
  755 {
  756         _ngi_check(item, file, line);
  757         return (&_NGI_FN(item));
  758 }
  759 
  760 static __inline ng_item_fn2 **
  761 _ngi_fn2(item_p item, char *file, int line)
  762 {
  763         _ngi_check(item, file, line);
  764         return (&_NGI_FN2(item));
  765 }
  766 
  767 static __inline void **
  768 _ngi_arg1(item_p item, char *file, int line)
  769 {
  770         _ngi_check(item, file, line);
  771         return (&_NGI_ARG1(item));
  772 }
  773 
  774 static __inline int *
  775 _ngi_arg2(item_p item, char *file, int line)
  776 {
  777         _ngi_check(item, file, line);
  778         return (&_NGI_ARG2(item));
  779 }
  780 
  781 static __inline node_p
  782 _ngi_node(item_p item, char *file, int line)
  783 {
  784         _ngi_check(item, file, line);
  785         return (_NGI_NODE(item));
  786 }
  787 
  788 static __inline hook_p
  789 _ngi_hook(item_p item, char *file, int line)
  790 {
  791         _ngi_check(item, file, line);
  792         return (_NGI_HOOK(item));
  793 }
  794 
  795 #define NGI_M(i)        (*_ngi_m(i, _NN_))
  796 #define NGI_MSG(i)      (*_ngi_msg(i, _NN_))
  797 #define NGI_RETADDR(i)  (*_ngi_retaddr(i, _NN_))
  798 #define NGI_FN(i)       (*_ngi_fn(i, _NN_))
  799 #define NGI_FN2(i)      (*_ngi_fn2(i, _NN_))
  800 #define NGI_ARG1(i)     (*_ngi_arg1(i, _NN_))
  801 #define NGI_ARG2(i)     (*_ngi_arg2(i, _NN_))
  802 #define NGI_HOOK(i)     _ngi_hook(i, _NN_)
  803 #define NGI_NODE(i)     _ngi_node(i, _NN_)
  804 #define NGI_SET_HOOK(i,h)                                               \
  805         do { _ngi_check(i, _NN_); _NGI_SET_HOOK(i, h); } while (0)
  806 #define NGI_CLR_HOOK(i)                                                 \
  807         do { _ngi_check(i, _NN_); _NGI_CLR_HOOK(i); } while (0)
  808 #define NGI_SET_NODE(i,n)                                               \
  809         do { _ngi_check(i, _NN_); _NGI_SET_NODE(i, n); } while (0)
  810 #define NGI_CLR_NODE(i)                                                 \
  811         do { _ngi_check(i, _NN_); _NGI_CLR_NODE(i); } while (0)
  812 
  813 #define NG_FREE_ITEM(item)                                              \
  814         do {                                                            \
  815                 _ngi_check(item, _NN_);                                 \
  816                 ng_free_item((item));                                   \
  817         } while (0)
  818 
  819 #define SAVE_LINE(item)                                                 \
  820         do {                                                            \
  821                 (item)->lastline = __LINE__;                            \
  822                 (item)->lastfile = __FILE__;                            \
  823         } while (0)
  824 
  825 #else   /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  826 
  827 #define NGI_M(i)        _NGI_M(i)
  828 #define NGI_MSG(i)      _NGI_MSG(i)
  829 #define NGI_RETADDR(i)  _NGI_RETADDR(i)
  830 #define NGI_FN(i)       _NGI_FN(i)
  831 #define NGI_FN2(i)      _NGI_FN2(i)
  832 #define NGI_ARG1(i)     _NGI_ARG1(i)
  833 #define NGI_ARG2(i)     _NGI_ARG2(i)
  834 #define NGI_NODE(i)     _NGI_NODE(i)
  835 #define NGI_HOOK(i)     _NGI_HOOK(i)
  836 #define NGI_SET_HOOK(i,h) _NGI_SET_HOOK(i,h)
  837 #define NGI_CLR_HOOK(i)   _NGI_CLR_HOOK(i)
  838 #define NGI_SET_NODE(i,n) _NGI_SET_NODE(i,n)
  839 #define NGI_CLR_NODE(i)   _NGI_CLR_NODE(i)
  840 
  841 #define NG_FREE_ITEM(item)      ng_free_item((item))
  842 #define SAVE_LINE(item)         do {} while (0)
  843 
  844 #endif  /* NETGRAPH_DEBUG */ /*----------------------------------------------*/
  845 
  846 #define NGI_GET_M(i,m)                                                  \
  847         do {                                                            \
  848                 (m) = NGI_M(i);                                         \
  849                 _NGI_M(i) = NULL;                                       \
  850         } while (0)
  851 
  852 #define NGI_GET_MSG(i,m)                                                \
  853         do {                                                            \
  854                 (m) = NGI_MSG(i);                                       \
  855                 _NGI_MSG(i) = NULL;                                     \
  856         } while (0)
  857 
  858 #define NGI_GET_NODE(i,n)       /* YOU NOW HAVE THE REFERENCE */        \
  859         do {                                                            \
  860                 (n) = NGI_NODE(i);                                      \
  861                 _NGI_NODE(i) = NULL;                                    \
  862         } while (0)
  863 
  864 #define NGI_GET_HOOK(i,h)                                               \
  865         do {                                                            \
  866                 (h) = NGI_HOOK(i);                                      \
  867                 _NGI_HOOK(i) = NULL;                                    \
  868         } while (0)
  869 
  870 #define NGI_SET_WRITER(i)       ((i)->el_flags &= ~NGQF_QMODE)
  871 #define NGI_SET_READER(i)       ((i)->el_flags |= NGQF_QREADER)
  872 
  873 #define NGI_QUEUED_READER(i)    ((i)->el_flags & NGQF_QREADER)
  874 #define NGI_QUEUED_WRITER(i)    (((i)->el_flags & NGQF_QMODE) == NGQF_QWRITER)
  875         
  876 /**********************************************************************
  877 * Data macros.  Send, manipulate and free.
  878 **********************************************************************/
  879 /*
  880  * Assuming the data is already ok, just set the new address and send
  881  */
  882 #define NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags)                \
  883         do {                                                            \
  884                 (error) =                                               \
  885                     ng_address_hook(NULL, (item), (hook), NG_NOFLAGS);  \
  886                 if (error == 0) {                                       \
  887                         SAVE_LINE(item);                                \
  888                         (error) = ng_snd_item((item), (flags));         \
  889                 }                                                       \
  890                 (item) = NULL;                                          \
  891         } while (0)
  892 #define NG_FWD_ITEM_HOOK(error, item, hook)     \
  893                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, NG_NOFLAGS)
  894 
  895 /*
  896  * Forward a data packet. Mbuf pointer is updated to new value. We
  897  * presume you dealt with the old one when you update it to the new one
  898  * (or it maybe the old one). We got a packet and possibly had to modify
  899  * the mbuf. You should probably use NGI_GET_M() if you are going to use
  900  * this too.
  901  */
  902 #define NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, flags)              \
  903         do {                                                            \
  904                 NGI_M(item) = (m);                                      \
  905                 (m) = NULL;                                             \
  906                 NG_FWD_ITEM_HOOK_FLAGS(error, item, hook, flags);       \
  907         } while (0)
  908 #define NG_FWD_NEW_DATA(error, item, hook, m)   \
  909                 NG_FWD_NEW_DATA_FLAGS(error, item, hook, m, NG_NOFLAGS)
  910 
  911 /* Send a previously unpackaged mbuf. XXX: This should be called
  912  * NG_SEND_DATA in future, but this name is kept for compatibility
  913  * reasons.
  914  */
  915 #define NG_SEND_DATA_FLAGS(error, hook, m, flags)                       \
  916         do {                                                            \
  917                 item_p _item;                                           \
  918                 if ((_item = ng_package_data((m), flags))) {            \
  919                         NG_FWD_ITEM_HOOK_FLAGS(error, _item, hook, flags);\
  920                 } else {                                                \
  921                         (error) = ENOMEM;                               \
  922                 }                                                       \
  923                 (m) = NULL;                                             \
  924         } while (0)
  925 
  926 #define NG_SEND_DATA_ONLY(error, hook, m)       \
  927                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
  928 /* NG_SEND_DATA() compat for meta-data times */
  929 #define NG_SEND_DATA(error, hook, m, x) \
  930                 NG_SEND_DATA_FLAGS(error, hook, m, NG_NOFLAGS)
  931 
  932 #define NG_FREE_MSG(msg)                                                \
  933         do {                                                            \
  934                 if ((msg)) {                                            \
  935                         free((msg), M_NETGRAPH_MSG);                    \
  936                         (msg) = NULL;                                   \
  937                 }                                                       \
  938         } while (0)
  939 
  940 #define NG_FREE_M(m)                                                    \
  941         do {                                                            \
  942                 if ((m)) {                                              \
  943                         m_freem((m));                                   \
  944                         (m) = NULL;                                     \
  945                 }                                                       \
  946         } while (0)
  947 
  948 /*****************************************
  949 * Message macros
  950 *****************************************/
  951 
  952 #define NG_SEND_MSG_HOOK(error, here, msg, hook, retaddr)               \
  953         do {                                                            \
  954                 item_p _item;                                           \
  955                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  956                         (msg) = NULL;                                   \
  957                         (error) = ENOMEM;                               \
  958                         break;                                          \
  959                 }                                                       \
  960                 if (((error) = ng_address_hook((here), (_item),         \
  961                                         (hook), (retaddr))) == 0) {     \
  962                         SAVE_LINE(_item);                               \
  963                         (error) = ng_snd_item((_item), 0);              \
  964                 }                                                       \
  965                 (msg) = NULL;                                           \
  966         } while (0)
  967 
  968 #define NG_SEND_MSG_PATH(error, here, msg, path, retaddr)               \
  969         do {                                                            \
  970                 item_p _item;                                           \
  971                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  972                         (msg) = NULL;                                   \
  973                         (error) = ENOMEM;                               \
  974                         break;                                          \
  975                 }                                                       \
  976                 if (((error) = ng_address_path((here), (_item),         \
  977                                         (path), (retaddr))) == 0) {     \
  978                         SAVE_LINE(_item);                               \
  979                         (error) = ng_snd_item((_item), 0);              \
  980                 }                                                       \
  981                 (msg) = NULL;                                           \
  982         } while (0)
  983 
  984 #define NG_SEND_MSG_ID(error, here, msg, ID, retaddr)                   \
  985         do {                                                            \
  986                 item_p _item;                                           \
  987                 if ((_item = ng_package_msg(msg, NG_NOFLAGS)) == NULL) {\
  988                         (msg) = NULL;                                   \
  989                         (error) = ENOMEM;                               \
  990                         break;                                          \
  991                 }                                                       \
  992                 if (((error) = ng_address_ID((here), (_item),           \
  993                                         (ID), (retaddr))) == 0) {       \
  994                         SAVE_LINE(_item);                               \
  995                         (error) = ng_snd_item((_item), 0);              \
  996                 }                                                       \
  997                 (msg) = NULL;                                           \
  998         } while (0)
  999 
 1000 /*
 1001  * Redirect the message to the next hop using the given hook.
 1002  * ng_retarget_msg() frees the item if there is an error
 1003  * and returns an error code.  It returns 0 on success.
 1004  */
 1005 #define NG_FWD_MSG_HOOK(error, here, item, hook, retaddr)               \
 1006         do {                                                            \
 1007                 if (((error) = ng_address_hook((here), (item),          \
 1008                                         (hook), (retaddr))) == 0) {     \
 1009                         SAVE_LINE(item);                                \
 1010                         (error) = ng_snd_item((item), 0);               \
 1011                 }                                                       \
 1012                 (item) = NULL;                                          \
 1013         } while (0)
 1014 
 1015 /*
 1016  * Send a queue item back to it's originator with a response message.
 1017  * Assume original message was removed and freed separatly.
 1018  */
 1019 #define NG_RESPOND_MSG(error, here, item, resp)                         \
 1020         do {                                                            \
 1021                 if (resp) {                                             \
 1022                         ng_ID_t _dest = NGI_RETADDR(item);              \
 1023                         NGI_RETADDR(item) = 0;                          \
 1024                         NGI_MSG(item) = resp;                           \
 1025                         if ((error = ng_address_ID((here), (item),      \
 1026                                         _dest, 0)) == 0) {              \
 1027                                 SAVE_LINE(item);                        \
 1028                                 (error) = ng_snd_item((item), NG_QUEUE);\
 1029                         }                                               \
 1030                 } else                                                  \
 1031                         NG_FREE_ITEM(item);                             \
 1032                 (item) = NULL;                                          \
 1033         } while (0)
 1034 
 1035 
 1036 /***********************************************************************
 1037  ******** Structures Definitions and Macros for defining a node  *******
 1038  ***********************************************************************
 1039  *
 1040  * Here we define the structures needed to actually define a new node
 1041  * type.
 1042  */
 1043 
 1044 /*
 1045  * Command list -- each node type specifies the command that it knows
 1046  * how to convert between ASCII and binary using an array of these.
 1047  * The last element in the array must be a terminator with cookie=0.
 1048  */
 1049 
 1050 struct ng_cmdlist {
 1051         u_int32_t                       cookie;         /* command typecookie */
 1052         int                             cmd;            /* command number */
 1053         const char                      *name;          /* command name */
 1054         const struct ng_parse_type      *mesgType;      /* args if !NGF_RESP */
 1055         const struct ng_parse_type      *respType;      /* args if NGF_RESP */
 1056 };
 1057 
 1058 /*
 1059  * Structure of a node type
 1060  * If data is sent to the "rcvdata()" entrypoint then the system
 1061  * may decide to defer it until later by queing it with the normal netgraph
 1062  * input queuing system.  This is decidde by the HK_QUEUE flag being set in
 1063  * the flags word of the peer (receiving) hook. The dequeuing mechanism will
 1064  * ensure it is not requeued again.
 1065  * Note the input queueing system is to allow modules
 1066  * to 'release the stack' or to pass data across spl layers.
 1067  * The data will be redelivered as soon as the NETISR code runs
 1068  * which may be almost immediatly.  A node may also do it's own queueing
 1069  * for other reasons (e.g. device output queuing).
 1070  */
 1071 struct ng_type {
 1072 
 1073         u_int32_t       version;        /* must equal NG_API_VERSION */
 1074         const char      *name;          /* Unique type name */
 1075         modeventhand_t  mod_event;      /* Module event handler (optional) */
 1076         ng_constructor_t *constructor;  /* Node constructor */
 1077         ng_rcvmsg_t     *rcvmsg;        /* control messages come here */
 1078         ng_close_t      *close;         /* warn about forthcoming shutdown */
 1079         ng_shutdown_t   *shutdown;      /* reset, and free resources */
 1080         ng_newhook_t    *newhook;       /* first notification of new hook */
 1081         ng_findhook_t   *findhook;      /* only if you have lots of hooks */
 1082         ng_connect_t    *connect;       /* final notification of new hook */
 1083         ng_rcvdata_t    *rcvdata;       /* data comes here */
 1084         ng_disconnect_t *disconnect;    /* notify on disconnect */
 1085 
 1086         const struct    ng_cmdlist *cmdlist;    /* commands we can convert */
 1087 
 1088         /* R/W data private to the base netgraph code DON'T TOUCH! */
 1089         LIST_ENTRY(ng_type) types;              /* linked list of all types */
 1090         int                 refs;               /* number of instances */
 1091 };
 1092 
 1093 /*
 1094  * Use the NETGRAPH_INIT() macro to link a node type into the
 1095  * netgraph system. This works for types compiled into the kernel
 1096  * as well as KLD modules. The first argument should be the type
 1097  * name (eg, echo) and the second a pointer to the type struct.
 1098  *
 1099  * If a different link time is desired, e.g., a device driver that
 1100  * needs to install its netgraph type before probing, use the
 1101  * NETGRAPH_INIT_ORDERED() macro instead.  Device drivers probably
 1102  * want to use SI_SUB_DRIVERS/SI_ORDER_FIRST.
 1103  */
 1104 
 1105 #define NETGRAPH_INIT_ORDERED(typename, typestructp, sub, order)        \
 1106 static moduledata_t ng_##typename##_mod = {                             \
 1107         "ng_" #typename,                                                \
 1108         ng_mod_event,                                                   \
 1109         (typestructp)                                                   \
 1110 };                                                                      \
 1111 DECLARE_MODULE(ng_##typename, ng_##typename##_mod, sub, order);         \
 1112 MODULE_DEPEND(ng_##typename, netgraph,  NG_ABI_VERSION,                 \
 1113                                         NG_ABI_VERSION,                 \
 1114                                         NG_ABI_VERSION)
 1115 
 1116 #define NETGRAPH_INIT(tn, tp)                                           \
 1117         NETGRAPH_INIT_ORDERED(tn, tp, SI_SUB_PSEUDO, SI_ORDER_MIDDLE)
 1118 
 1119 /* Special malloc() type for netgraph structs and ctrl messages */
 1120 /* Only these two types should be visible to nodes */
 1121 MALLOC_DECLARE(M_NETGRAPH);
 1122 MALLOC_DECLARE(M_NETGRAPH_MSG);
 1123 
 1124 /* declare the base of the netgraph sysclt hierarchy */
 1125 /* but only if this file cares about sysctls */
 1126 #ifdef  SYSCTL_DECL
 1127 SYSCTL_DECL(_net_graph);
 1128 #endif
 1129 
 1130 /*
 1131  * Methods that the nodes can use.
 1132  * Many of these methods should usually NOT be used directly but via
 1133  * Macros above.
 1134  */
 1135 int     ng_address_ID(node_p here, item_p item, ng_ID_t ID, ng_ID_t retaddr);
 1136 int     ng_address_hook(node_p here, item_p item, hook_p hook, ng_ID_t retaddr);
 1137 int     ng_address_path(node_p here, item_p item, char *address, ng_ID_t raddr);
 1138 int     ng_bypass(hook_p hook1, hook_p hook2);
 1139 hook_p  ng_findhook(node_p node, const char *name);
 1140 struct  ng_type *ng_findtype(const char *type);
 1141 int     ng_make_node_common(struct ng_type *typep, node_p *nodep);
 1142 int     ng_name_node(node_p node, const char *name);
 1143 node_p  ng_name2noderef(node_p node, const char *name);
 1144 int     ng_newtype(struct ng_type *tp);
 1145 ng_ID_t ng_node2ID(node_p node);
 1146 item_p  ng_package_data(struct mbuf *m, int flags);
 1147 item_p  ng_package_msg(struct ng_mesg *msg, int flags);
 1148 item_p  ng_package_msg_self(node_p here, hook_p hook, struct ng_mesg *msg);
 1149 void    ng_replace_retaddr(node_p here, item_p item, ng_ID_t retaddr);
 1150 int     ng_rmhook_self(hook_p hook);    /* if a node wants to kill a hook */
 1151 int     ng_rmnode_self(node_p here);    /* if a node wants to suicide */
 1152 int     ng_rmtype(struct ng_type *tp);
 1153 int     ng_snd_item(item_p item, int queue);
 1154 int     ng_send_fn(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
 1155         int arg2);
 1156 int     ng_send_fn1(node_p node, hook_p hook, ng_item_fn *fn, void *arg1,
 1157         int arg2, int flags);
 1158 int     ng_send_fn2(node_p node, hook_p hook, item_p pitem, ng_item_fn2 *fn,
 1159         void *arg1, int arg2, int flags);
 1160 int     ng_uncallout(struct callout *c, node_p node);
 1161 int     ng_callout(struct callout *c, node_p node, hook_p hook, int ticks,
 1162             ng_item_fn *fn, void * arg1, int arg2);
 1163 #define ng_callout_init(c)      callout_init(c, CALLOUT_MPSAFE)
 1164 
 1165 /* Flags for netgraph functions. */
 1166 #define NG_NOFLAGS      0x00000000      /* no special options */
 1167 #define NG_QUEUE        0x00000001      /* enqueue item, don't dispatch */
 1168 #define NG_WAITOK       0x00000002      /* use M_WAITOK, etc. */
 1169 /* XXXGL: NG_PROGRESS unused since ng_base.c rev. 1.136. Should be deleted? */
 1170 #define NG_PROGRESS     0x00000004      /* return EINPROGRESS if queued */
 1171 #define NG_REUSE_ITEM   0x00000008      /* supplied item should be reused */
 1172 
 1173 /*
 1174  * prototypes the user should DEFINITELY not use directly
 1175  */
 1176 void    ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
 1177 int     ng_mod_event(module_t mod, int what, void *arg);
 1178 
 1179 /*
 1180  * Tag definitions and constants
 1181  */
 1182 
 1183 #define NG_TAG_PRIO     1
 1184 
 1185 struct ng_tag_prio {
 1186         struct m_tag    tag;
 1187         char    priority;
 1188         char    discardability;
 1189 };
 1190 
 1191 #define NG_PRIO_CUTOFF          32
 1192 #define NG_PRIO_LINKSTATE       64
 1193 
 1194 /* Macros and declarations to keep compatibility with metadata, which
 1195  * is obsoleted now. To be deleted.
 1196  */
 1197 typedef void *meta_p;
 1198 #define _NGI_META(i)    NULL
 1199 #define NGI_META(i)     NULL
 1200 #define NG_FREE_META(meta)
 1201 #define NGI_GET_META(i,m)
 1202 #define ng_copy_meta(meta) NULL
 1203 
 1204 /* Hash related definitions */
 1205 #define NG_ID_HASH_SIZE 128 /* most systems wont need even this many */
 1206 #define NG_NAME_HASH_SIZE 128 /* most systems wont need even this many */
 1207 
 1208 /*
 1209  * Mark the current thread when called from the outbound path of the
 1210  * network stack, in order to enforce queuing on ng nodes calling into
 1211  * the inbound network stack path.
 1212  */
 1213 #define NG_OUTBOUND_THREAD_REF()                                        \
 1214         curthread->td_ng_outbound++
 1215 #define NG_OUTBOUND_THREAD_UNREF()                                      \
 1216         do {                                                            \
 1217                 curthread->td_ng_outbound--;                            \
 1218                 KASSERT(curthread->td_ng_outbound >= 0,                 \
 1219                     ("%s: negative td_ng_outbound", __func__));         \
 1220         } while (0)
 1221 
 1222 #endif /* _NETGRAPH_NETGRAPH_H_ */

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