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 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_ZERO | M_NOWAIT); 89 if (priv == NULL) 90 return (ENOMEM); 91 bzero(priv, sizeof(*priv)); 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 (EPFNOSUPPORT); 118 } 119 120 if (*localhook != NULL) 121 return (EISCONN); 122 *localhook = hook; 123 NG_HOOK_SET_PRIVATE(hook, localhook); 124 125 return (0); 126 } 127 128 /* 129 * Recive data from a hook. 130 */ 131 static int 132 ng_split_rcvdata(hook_p hook, item_p item) 133 { 134 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 135 int error = 0; 136 137 if (hook == priv->out) { 138 printf("ng_split: got packet from out hook!\n"); 139 NG_FREE_ITEM(item); 140 error = EINVAL; 141 } else if ((hook == priv->in) && (priv->mixed != NULL)) { 142 NG_FWD_ITEM_HOOK(error, item, priv->mixed); 143 } else if ((hook == priv->mixed) && (priv->out != NULL)) { 144 NG_FWD_ITEM_HOOK(error, item, priv->out); 145 } 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 FREE(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