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