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@whistle.com> 38 * 39 * $FreeBSD$ 40 * $Whistle: ng_echo.c,v 1.11 1999/01/28 23:54:53 julian Exp $ 41 */ 42 43 /* 44 * Netgraph "echo" node 45 * 46 * This node simply bounces data and messages back to whence they came. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/errno.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/mbuf.h> 55 #include <sys/syslog.h> 56 #include <netgraph/ng_message.h> 57 #include <netgraph/netgraph.h> 58 #include <netgraph/ng_echo.h> 59 60 /* Netgraph methods */ 61 static int nge_rcvmsg(node_p node, struct ng_mesg *msg, 62 const char *retaddr, struct ng_mesg ** resp); 63 static int nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); 64 static int nge_disconnect(hook_p hook); 65 66 /* Netgraph type */ 67 static struct ng_type typestruct = { 68 NG_VERSION, 69 NG_ECHO_NODE_TYPE, 70 NULL, 71 NULL, 72 nge_rcvmsg, 73 NULL, 74 NULL, 75 NULL, 76 NULL, 77 nge_rcvdata, 78 nge_rcvdata, 79 nge_disconnect 80 }; 81 NETGRAPH_INIT(echo, &typestruct); 82 83 /* 84 * Receive control message. We just bounce it back as a reply. 85 */ 86 static int 87 nge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 88 struct ng_mesg **rptr) 89 { 90 if (rptr) { 91 msg->header.flags |= NGF_RESP; 92 *rptr = msg; 93 } else { 94 FREE(msg, M_NETGRAPH); 95 } 96 return (0); 97 } 98 99 /* 100 * Receive data 101 */ 102 static int 103 nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 104 { 105 int error = 0; 106 107 NG_SEND_DATA(error, hook, m, meta); 108 return (error); 109 } 110 111 /* 112 * Removal of the last link destroys the nodeo 113 */ 114 static int 115 nge_disconnect(hook_p hook) 116 { 117 if (hook->node->numhooks == 0) 118 ng_rmnode(hook->node); 119 return (0); 120 } 121 122