1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1999-2000, Vitaly V Belekhov 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 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/errno.h> 38 #include <sys/sockio.h> 39 #include <sys/socket.h> 40 #include <sys/syslog.h> 41 42 #include <netgraph/ng_message.h> 43 #include <netgraph/netgraph.h> 44 #include <netgraph/ng_split.h> 45 46 /* Netgraph methods */ 47 static ng_constructor_t ng_split_constructor; 48 static ng_shutdown_t ng_split_shutdown; 49 static ng_newhook_t ng_split_newhook; 50 static ng_rcvdata_t ng_split_rcvdata; 51 static ng_disconnect_t ng_split_disconnect; 52 53 /* Node type descriptor */ 54 static struct ng_type typestruct = { 55 .version = NG_ABI_VERSION, 56 .name = NG_SPLIT_NODE_TYPE, 57 .constructor = ng_split_constructor, 58 .shutdown = ng_split_shutdown, 59 .newhook = ng_split_newhook, 60 .rcvdata = ng_split_rcvdata, 61 .disconnect = ng_split_disconnect, 62 }; 63 NETGRAPH_INIT(ng_split, &typestruct); 64 65 /* Node private data */ 66 struct ng_split_private { 67 hook_p out; 68 hook_p in; 69 hook_p mixed; 70 node_p node; /* Our netgraph node */ 71 }; 72 typedef struct ng_split_private *priv_p; 73 74 /************************************************************************ 75 NETGRAPH NODE STUFF 76 ************************************************************************/ 77 78 /* 79 * Constructor for a node 80 */ 81 static int 82 ng_split_constructor(node_p node) 83 { 84 priv_p priv; 85 86 /* Allocate node */ 87 priv = malloc(sizeof(*priv), M_NETGRAPH, M_ZERO | M_WAITOK); 88 89 /* Link together node and private info */ 90 NG_NODE_SET_PRIVATE(node, priv); 91 priv->node = node; 92 93 /* Done */ 94 return (0); 95 } 96 97 /* 98 * Give our ok for a hook to be added 99 */ 100 static int 101 ng_split_newhook(node_p node, hook_p hook, const char *name) 102 { 103 priv_p priv = NG_NODE_PRIVATE(node); 104 hook_p *localhook; 105 106 if (strcmp(name, NG_SPLIT_HOOK_MIXED) == 0) { 107 localhook = &priv->mixed; 108 } else if (strcmp(name, NG_SPLIT_HOOK_IN) == 0) { 109 localhook = &priv->in; 110 } else if (strcmp(name, NG_SPLIT_HOOK_OUT) == 0) { 111 localhook = &priv->out; 112 } else 113 return (EINVAL); 114 115 if (*localhook != NULL) 116 return (EISCONN); 117 *localhook = hook; 118 NG_HOOK_SET_PRIVATE(hook, localhook); 119 120 return (0); 121 } 122 123 /* 124 * Recive data from a hook. 125 */ 126 static int 127 ng_split_rcvdata(hook_p hook, item_p item) 128 { 129 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 130 int error = 0; 131 132 if (hook == priv->out) { 133 printf("ng_split: got packet from out hook!\n"); 134 NG_FREE_ITEM(item); 135 error = EINVAL; 136 } else if ((hook == priv->in) && (priv->mixed != NULL)) { 137 NG_FWD_ITEM_HOOK(error, item, priv->mixed); 138 } else if ((hook == priv->mixed) && (priv->out != NULL)) { 139 NG_FWD_ITEM_HOOK(error, item, priv->out); 140 } 141 142 if (item) 143 NG_FREE_ITEM(item); 144 145 return (error); 146 } 147 148 static int 149 ng_split_shutdown(node_p node) 150 { 151 const priv_p priv = NG_NODE_PRIVATE(node); 152 153 NG_NODE_SET_PRIVATE(node, NULL); 154 NG_NODE_UNREF(node); 155 free(priv, M_NETGRAPH); 156 157 return (0); 158 } 159 160 /* 161 * Hook disconnection 162 */ 163 static int 164 ng_split_disconnect(hook_p hook) 165 { 166 hook_p *localhook = NG_HOOK_PRIVATE(hook); 167 168 KASSERT(localhook != NULL, ("%s: null info", __func__)); 169 *localhook = NULL; 170 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 171 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { 172 ng_rmnode_self(NG_HOOK_NODE(hook)); 173 } 174 175 return (0); 176 } 177