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  * $DragonFly: src/sys/netgraph7/ng_split.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
  30  *
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/errno.h>
  36 #include <sys/kernel.h>
  37 #include <sys/malloc.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/errno.h>
  40 #include <sys/sockio.h>
  41 #include <sys/socket.h>
  42 #include <sys/syslog.h>
  43
  44 #include "ng_message.h"
  45 #include "netgraph.h"
  46 #include "ng_split.h"
  47
  48 /* Netgraph methods */
  49 static ng_constructor_t ng_split_constructor;
  50 static ng_shutdown_t ng_split_shutdown;
  51 static ng_newhook_t ng_split_newhook;
  52 static ng_rcvdata_t ng_split_rcvdata;
  53 static ng_disconnect_t ng_split_disconnect;
  54
  55 /* Node type descriptor */
  56 static struct ng_type typestruct = {
  57         .version =      NG_ABI_VERSION,
  58         .name =         NG_SPLIT_NODE_TYPE,
  59         .constructor =  ng_split_constructor,
  60         .shutdown =     ng_split_shutdown,
  61         .newhook =      ng_split_newhook,
  62         .rcvdata =      ng_split_rcvdata,
  63         .disconnect =   ng_split_disconnect,
  64 };
  65 NETGRAPH_INIT(ng_split, &typestruct);
  66
  67 /* Node private data */
  68 struct ng_split_private {
  69         hook_p out;
  70         hook_p in;
  71         hook_p mixed;
  72         node_p  node;                   /* Our netgraph node */
  73 };
  74 typedef struct ng_split_private *priv_p;
  75
  76 /************************************************************************
  77                         NETGRAPH NODE STUFF
  78  ************************************************************************/
  79
  80 /*
  81  * Constructor for a node
  82  */
  83 static int
  84 ng_split_constructor(node_p node)
  85 {
  86         priv_p          priv;
  87
  88         /* Allocate node */
  89         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK | M_NULLOK);
  90         if (priv == NULL)
  91                 return (ENOMEM);
  92
  93         /* Link together node and private info */
  94         NG_NODE_SET_PRIVATE(node, priv);
  95         priv->node = node;
  96
  97         /* Done */
  98         return (0);
  99 }
 100
 101 /*
 102  * Give our ok for a hook to be added
 103  */
 104 static int
 105 ng_split_newhook(node_p node, hook_p hook, const char *name)
 106 {
 107         priv_p          priv = NG_NODE_PRIVATE(node);
 108         hook_p          *localhook;
 109
 110         if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) {
 111                 localhook = &priv->mixed;
 112         } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) {
 113                 localhook = &priv->in;
 114         } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) {
 115                 localhook = &priv->out;
 116         } else
 117                 return (EINVAL);
 118
 119         if (*localhook != NULL)
 120                 return (EISCONN);
 121         *localhook = hook;
 122         NG_HOOK_SET_PRIVATE(hook, localhook);
 123
 124         return (0);
 125 }
 126
 127 /*
 128  * Recive data from a hook.
 129  */
 130 static int
 131 ng_split_rcvdata(hook_p hook, item_p item)
 132 {
 133         const priv_p    priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
 134         int             error = 0;
 135
 136         if (hook == priv->out) {
 137                 printf("ng_split: got packet from out hook!\n");
 138                 NG_FREE_ITEM(item);
 139                 error = EINVAL;
 140         } else if ((hook == priv->in) && (priv->mixed != NULL)) {
 141                 NG_FWD_ITEM_HOOK(error, item, priv->mixed);
 142         } else if ((hook == priv->mixed) && (priv->out != NULL)) {
 143                 NG_FWD_ITEM_HOOK(error, item, priv->out);
 144         }
 145
 146         if (item)
 147                 NG_FREE_ITEM(item);
 148
 149         return (error);
 150 }
 151
 152 static int
 153 ng_split_shutdown(node_p node)
 154 {
 155         const priv_p    priv = NG_NODE_PRIVATE(node);
 156
 157         NG_NODE_SET_PRIVATE(node, NULL);
 158         NG_NODE_UNREF(node);
 159         FREE(priv, M_NETGRAPH);
 160
 161         return (0);
 162 }
 163
 164 /*
 165  * Hook disconnection
 166  */
 167 static int
 168 ng_split_disconnect(hook_p hook)
 169 {
 170         hook_p          *localhook = NG_HOOK_PRIVATE(hook);
 171
 172         KASSERT(localhook != NULL, ("%s: null info", __func__));
 173         *localhook = NULL;
 174         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
 175             && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
 176                 ng_rmnode_self(NG_HOOK_NODE(hook));
 177         }
 178
 179         return (0);
 180 }