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 } 179