1 /*- 2 * Copyright (c) 2004 Ruslan Ermilov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/netgraph/ng_hub.c,v 1.3 2004/06/26 22:24:16 julian Exp $ 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 <netgraph7/ng_message.h> 36 #include <netgraph7/netgraph.h> 37 #include "ng_hub.h" 38 39 static ng_constructor_t ng_hub_constructor; 40 static ng_rcvdata_t ng_hub_rcvdata; 41 static ng_disconnect_t ng_hub_disconnect; 42 43 static struct ng_type ng_hub_typestruct = { 44 .version = NG_ABI_VERSION, 45 .name = NG_HUB_NODE_TYPE, 46 .constructor = ng_hub_constructor, 47 .rcvdata = ng_hub_rcvdata, 48 .disconnect = ng_hub_disconnect, 49 }; 50 NETGRAPH_INIT(hub, &ng_hub_typestruct); 51 52 53 static int 54 ng_hub_constructor(node_p node) 55 { 56 57 return (0); 58 } 59 60 static int 61 ng_hub_rcvdata(hook_p hook, item_p item) 62 { 63 const node_p node = NG_HOOK_NODE(hook); 64 int error = 0; 65 hook_p hook2; 66 struct mbuf * const m = NGI_M(item), *m2; 67 int nhooks; 68 69 if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) { 70 NG_FREE_ITEM(item); 71 return (0); 72 } 73 LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) { 74 if (hook2 == hook) 75 continue; 76 if (--nhooks == 1) 77 NG_FWD_ITEM_HOOK(error, item, hook2); 78 else { 79 if ((m2 = m_dup(m, M_NOWAIT)) == NULL) { 80 NG_FREE_ITEM(item); 81 return (ENOBUFS); 82 } 83 NG_SEND_DATA_ONLY(error, hook2, m2); 84 if (error) 85 continue; /* don't give up */ 86 } 87 } 88 89 return (error); 90 } 91 92 static int 93 ng_hub_disconnect(hook_p hook) 94 { 95 96 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 && 97 NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 98 ng_rmnode_self(NG_HOOK_NODE(hook)); 99 return (0); 100 } 101