1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 Ruslan Ermilov 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, this list of conditions and the following 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 29 #include <sys/param.h> 30 #include <sys/errno.h> 31 #include <sys/kernel.h> 32 #include <sys/mbuf.h> 33 #include <sys/systm.h> 34 35 #include <netgraph/ng_message.h> 36 #include <netgraph/ng_hub.h> 37 #include <netgraph/netgraph.h> 38 39 #ifdef NG_SEPARATE_MALLOC 40 static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node"); 41 #else 42 #define M_NETGRAPH_HUB M_NETGRAPH 43 #endif 44 45 /* Per-node private data */ 46 struct ng_hub_private { 47 int persistent; /* can exist w/o hooks */ 48 }; 49 typedef struct ng_hub_private *priv_p; 50 51 /* Netgraph node methods */ 52 static ng_constructor_t ng_hub_constructor; 53 static ng_rcvmsg_t ng_hub_rcvmsg; 54 static ng_shutdown_t ng_hub_shutdown; 55 static ng_rcvdata_t ng_hub_rcvdata; 56 static ng_disconnect_t ng_hub_disconnect; 57 58 /* List of commands and how to convert arguments to/from ASCII */ 59 static const struct ng_cmdlist ng_hub_cmdlist[] = { 60 { 61 NGM_HUB_COOKIE, 62 NGM_HUB_SET_PERSISTENT, 63 "setpersistent", 64 NULL, 65 NULL 66 }, 67 { 0 } 68 }; 69 70 static struct ng_type ng_hub_typestruct = { 71 .version = NG_ABI_VERSION, 72 .name = NG_HUB_NODE_TYPE, 73 .constructor = ng_hub_constructor, 74 .rcvmsg = ng_hub_rcvmsg, 75 .shutdown = ng_hub_shutdown, 76 .rcvdata = ng_hub_rcvdata, 77 .disconnect = ng_hub_disconnect, 78 .cmdlist = ng_hub_cmdlist, 79 }; 80 NETGRAPH_INIT(hub, &ng_hub_typestruct); 81 82 static int 83 ng_hub_constructor(node_p node) 84 { 85 priv_p priv; 86 87 /* Allocate and initialize private info */ 88 priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO); 89 90 NG_NODE_SET_PRIVATE(node, priv); 91 return (0); 92 } 93 94 /* 95 * Receive a control message 96 */ 97 static int 98 ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook) 99 { 100 const priv_p priv = NG_NODE_PRIVATE(node); 101 int error = 0; 102 struct ng_mesg *msg; 103 104 NGI_GET_MSG(item, msg); 105 if (msg->header.typecookie == NGM_HUB_COOKIE && 106 msg->header.cmd == NGM_HUB_SET_PERSISTENT) { 107 priv->persistent = 1; 108 } else { 109 error = EINVAL; 110 } 111 112 NG_FREE_MSG(msg); 113 return (error); 114 } 115 116 static int 117 ng_hub_rcvdata(hook_p hook, item_p item) 118 { 119 const node_p node = NG_HOOK_NODE(hook); 120 int error = 0; 121 hook_p hook2; 122 struct mbuf * const m = NGI_M(item), *m2; 123 int nhooks; 124 125 if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) { 126 NG_FREE_ITEM(item); 127 return (0); 128 } 129 LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) { 130 if (hook2 == hook) 131 continue; 132 if (--nhooks == 1) 133 NG_FWD_ITEM_HOOK(error, item, hook2); 134 else { 135 if ((m2 = m_dup(m, M_NOWAIT)) == NULL) { 136 NG_FREE_ITEM(item); 137 return (ENOBUFS); 138 } 139 NG_SEND_DATA_ONLY(error, hook2, m2); 140 if (error) 141 continue; /* don't give up */ 142 } 143 } 144 145 return (error); 146 } 147 148 /* 149 * Shutdown node 150 */ 151 static int 152 ng_hub_shutdown(node_p node) 153 { 154 const priv_p priv = NG_NODE_PRIVATE(node); 155 156 free(priv, M_NETGRAPH_HUB); 157 NG_NODE_SET_PRIVATE(node, NULL); 158 NG_NODE_UNREF(node); 159 return (0); 160 } 161 162 static int 163 ng_hub_disconnect(hook_p hook) 164 { 165 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 166 167 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 && 168 NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent) 169 ng_rmnode_self(NG_HOOK_NODE(hook)); 170 return (0); 171 } 172