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 priv = kmalloc(sizeof(*priv), M_NETGRAPH, 90 M_ZERO | M_WAITOK | M_NULLOK); 91 if (priv == NULL) 92 return (ENOMEM); 93 94 /* Link together node and private info */ 95 NG_NODE_SET_PRIVATE(node, priv); 96 priv->node = node; 97 98 /* Done */ 99 return (0); 100 } 101 102 /* 103 * Give our ok for a hook to be added 104 */ 105 static int 106 ng_split_newhook(node_p node, hook_p hook, const char *name) 107 { 108 priv_p priv = NG_NODE_PRIVATE(node); 109 hook_p *localhook; 110 111 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) { 112 localhook = &priv->mixed; 113 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) { 114 localhook = &priv->in; 115 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) { 116 localhook = &priv->out; 117 } else 118 return (EINVAL); 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 if (item) 148 NG_FREE_ITEM(item); 149 150 return (error); 151 } 152 153 static int 154 ng_split_shutdown(node_p node) 155 { 156 const priv_p priv = NG_NODE_PRIVATE(node); 157 158 NG_NODE_SET_PRIVATE(node, NULL); 159 NG_NODE_UNREF(node); 160 kfree(priv, M_NETGRAPH); 161 162 return (0); 163 } 164 165 /* 166 * Hook disconnection 167 */ 168 static int 169 ng_split_disconnect(hook_p hook) 170 { 171 hook_p *localhook = NG_HOOK_PRIVATE(hook); 172 173 KASSERT(localhook != NULL, ("%s: null info", __func__)); 174 *localhook = NULL; 175 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 176 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { 177 ng_rmnode_self(NG_HOOK_NODE(hook)); 178 } 179 180 return (0); 181 } 182