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 * $FreeBSD$ 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 priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK); 89 90 /* Link together node and private info */ 91 NG_NODE_SET_PRIVATE(node, priv); 92 priv->node = node; 93 94 /* Done */ 95 return (0); 96 } 97 98 /* 99 * Give our ok for a hook to be added 100 */ 101 static int 102 ng_split_newhook(node_p node, hook_p hook, const char *name) 103 { 104 priv_p priv = NG_NODE_PRIVATE(node); 105 hook_p *localhook; 106 107 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) { 108 localhook = &priv->mixed; 109 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) { 110 localhook = &priv->in; 111 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) { 112 localhook = &priv->out; 113 } else 114 return (EINVAL); 115 116 if (*localhook != NULL) 117 return (EISCONN); 118 *localhook = hook; 119 NG_HOOK_SET_PRIVATE(hook, localhook); 120 121 return (0); 122 } 123 124 /* 125 * Recive data from a hook. 126 */ 127 static int 128 ng_split_rcvdata(hook_p hook, item_p item) 129 { 130 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 131 int error = 0; 132 133 if (hook == priv->out) { 134 printf("ng_split: got packet from out hook!\n"); 135 NG_FREE_ITEM(item); 136 error = EINVAL; 137 } else if ((hook == priv->in) && (priv->mixed != NULL)) { 138 NG_FWD_ITEM_HOOK(error, item, priv->mixed); 139 } else if ((hook == priv->mixed) && (priv->out != NULL)) { 140 NG_FWD_ITEM_HOOK(error, item, priv->out); 141 } 142 143 if (item) 144 NG_FREE_ITEM(item); 145 146 return (error); 147 } 148 149 static int 150 ng_split_shutdown(node_p node) 151 { 152 const priv_p priv = NG_NODE_PRIVATE(node); 153 154 NG_NODE_SET_PRIVATE(node, NULL); 155 NG_NODE_UNREF(node); 156 free(priv, M_NETGRAPH); 157 158 return (0); 159 } 160 161 /* 162 * Hook disconnection 163 */ 164 static int 165 ng_split_disconnect(hook_p hook) 166 { 167 hook_p *localhook = NG_HOOK_PRIVATE(hook); 168 169 KASSERT(localhook != NULL, ("%s: null info", __func__)); 170 *localhook = NULL; 171 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 172 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { 173 ng_rmnode_self(NG_HOOK_NODE(hook)); 174 } 175 176 return (0); 177 } 178