1 2 /* 3 * ng_echo.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elisher <julian@freebsd.org> 38 * 39 * $FreeBSD: src/sys/netgraph/ng_echo.c,v 1.4.2.1 2000/10/24 18:36:44 julian Exp $ 40 * $DragonFly: src/sys/netgraph/echo/ng_echo.c,v 1.3 2003/08/07 21:17:31 dillon Exp $ 41 * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 /* 45 * Netgraph "echo" node 46 * 47 * This node simply bounces data and messages back to whence they came. 48 */ 49 50 #include <sys/param.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <netgraph/ng_message.h> 55 #include <netgraph/netgraph.h> 56 #include "ng_echo.h" 57 58 /* Netgraph methods */ 59 static ng_rcvmsg_t nge_rcvmsg; 60 static ng_rcvdata_t nge_rcvdata; 61 static ng_disconnect_t nge_disconnect; 62 63 /* Netgraph type */ 64 static struct ng_type typestruct = { 65 NG_VERSION, 66 NG_ECHO_NODE_TYPE, 67 NULL, 68 NULL, 69 nge_rcvmsg, 70 NULL, 71 NULL, 72 NULL, 73 NULL, 74 nge_rcvdata, 75 nge_rcvdata, 76 nge_disconnect, 77 NULL 78 }; 79 NETGRAPH_INIT(echo, &typestruct); 80 81 /* 82 * Receive control message. We just bounce it back as a reply. 83 */ 84 static int 85 nge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 86 struct ng_mesg **rptr) 87 { 88 if (rptr) { 89 msg->header.flags |= NGF_RESP; 90 *rptr = msg; 91 } else { 92 FREE(msg, M_NETGRAPH); 93 } 94 return (0); 95 } 96 97 /* 98 * Receive data 99 */ 100 static int 101 nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 102 { 103 int error = 0; 104 105 NG_SEND_DATA(error, hook, m, meta); 106 return (error); 107 } 108 109 /* 110 * Removal of the last link destroys the nodeo 111 */ 112 static int 113 nge_disconnect(hook_p hook) 114 { 115 if (hook->node->numhooks == 0) 116 ng_rmnode(hook->node); 117 return (0); 118 } 119 120