sys/netgraph7/ng_split.c

   1 /*-
   2  *
   3  * Copyright (c) 1999-2000, Vitaly V Belekhov
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice unmodified, this list of conditions, and the following
  11  *    disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/netgraph/ng_split.c,v 1.7 2005/08/29 13:47:08 glebius Exp $
  29  *
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/errno.h>
  35 #include <sys/kernel.h>
  36 #include <sys/malloc.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/errno.h>
  39 #include <sys/sockio.h>
  40 #include <sys/socket.h>
  41 #include <sys/syslog.h>
  42
  43 #include <netgraph/ng_message.h>
  44 #include <netgraph/netgraph.h>
  45 #include <netgraph/ng_split.h>
  46
  47 /* Netgraph methods */
  48 static ng_constructor_t ng_split_constructor;
  49 static ng_shutdown_t ng_split_shutdown;
  50 static ng_newhook_t ng_split_newhook;
  51 static ng_rcvdata_t ng_split_rcvdata;
  52 static ng_disconnect_t ng_split_disconnect;
  53
  54 /* Node type descriptor */
  55 static struct ng_type typestruct = {
  56         .version =      NG_ABI_VERSION,
  57         .name =         NG_SPLIT_NODE_TYPE,
  58         .constructor =  ng_split_constructor,
  59         .shutdown =     ng_split_shutdown,
  60         .newhook =      ng_split_newhook,
  61         .rcvdata =      ng_split_rcvdata,
  62         .disconnect =   ng_split_disconnect,
  63 };
  64 NETGRAPH_INIT(ng_split, &typestruct);
  65
  66 /* Node private data */
  67 struct ng_split_private {
  68         hook_p out;
  69         hook_p in;
  70         hook_p mixed;
  71         node_p  node;                   /* Our netgraph node */
  72 };
  73 typedef struct ng_split_private *priv_p;
  74
  75 /************************************************************************
  76                         NETGRAPH NODE STUFF
  77  ************************************************************************/
  78
  79 /*
  80  * Constructor for a node
  81  */
  82 static int
  83 ng_split_constructor(node_p node)
  84 {
  85         priv_p          priv;
  86
  87         /* Allocate node */
  88         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT);
  89         if (priv == NULL)
  90                 return (ENOMEM);
  91
  92         /* Link together node and private info */
  93         NG_NODE_SET_PRIVATE(node, priv);
  94         priv->node = node;
  95
  96         /* Done */
  97         return (0);
  98 }
  99
 100 /*
 101  * Give our ok for a hook to be added
 102  */
 103 static int
 104 ng_split_newhook(node_p node, hook_p hook, const char *name)
 105 {
 106         priv_p          priv = NG_NODE_PRIVATE(node);
 107         hook_p          *localhook;
 108
 109         if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
 110                 localhook = &priv->mixed;
 111         } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
 112                 localhook = &priv->in;
 113         } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
 114                 localhook = &priv->out;
 115         } else
 116                 return (EINVAL);
 117
 118         if (*localhook != NULL)
 119                 return (EISCONN);
 120         *localhook = hook;
 121         NG_HOOK_SET_PRIVATE(hook, localhook);
 122
 123         return (0);
 124 }
 125
 126 /*
 127  * Recive data from a hook.
 128  */
 129 static int
 130 ng_split_rcvdata(hook_p hook, item_p item)
 131 {
 132         const priv_p    priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 133         int             error = 0;
 134
 135         if (hook == priv->out) {
 136                 printf("ng_split: got packet from out hook!\n");
 137                 NG_FREE_ITEM(item);
 138                 error = EINVAL;
 139         } else if ((hook == priv->in) && (priv->mixed != NULL)) {
 140                 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
 141         } else if ((hook == priv->mixed) && (priv->out != NULL)) {
 142                 NG_FWD_ITEM_HOOK(error, item, priv->out);
 143         }
 144
 145         if (item)
 146                 NG_FREE_ITEM(item);
 147
 148         return (error);
 149 }
 150
 151 static int
 152 ng_split_shutdown(node_p node)
 153 {
 154         const priv_p    priv = NG_NODE_PRIVATE(node);
 155
 156         NG_NODE_SET_PRIVATE(node, NULL);
 157         NG_NODE_UNREF(node);
 158         FREE(priv, M_NETGRAPH);
 159
 160         return (0);
 161 }
 162
 163 /*
 164  * Hook disconnection
 165  */
 166 static int
 167 ng_split_disconnect(hook_p hook)
 168 {
 169         hook_p          *localhook = NG_HOOK_PRIVATE(hook);
 170
 171         KASSERT(localhook != NULL, ("%s: null info", __func__));
 172         *localhook = NULL;
 173         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
 174             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
 175                 ng_rmnode_self(NG_HOOK_NODE(hook));
 176         }
 177
 178         return (0);
 179 }