/* * ng_echo.c * * Copyright (c) 1996-1999 Whistle Communications, Inc. * All rights reserved. * * Subject to the following obligations and disclaimer of warranty, use and * redistribution of this software, in source or object code forms, with or * without modifications are expressly permitted by Whistle Communications; * provided, however, that: * 1. Any and all reproductions of the source or object code must include the * copyright notice above and the following disclaimer of warranties; and * 2. No rights are granted, in any manner or form, to use Whistle * Communications, Inc. trademarks, including the mark "WHISTLE * COMMUNICATIONS" on advertising, endorsements, or otherwise except as * such appears in the above copyright notice or in the software. * * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * Author: Julian Elisher * * $FreeBSD: src/sys/netgraph/ng_echo.c,v 1.4.2.1 2000/10/24 18:36:44 julian Exp $ * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $ */ /* * Netgraph "echo" node * * This node simply bounces data and messages back to whence they came. */ #include #include #include #include #include #include #include "ng_echo.h" /* Netgraph methods */ static ng_rcvmsg_t nge_rcvmsg; static ng_rcvdata_t nge_rcvdata; static ng_disconnect_t nge_disconnect; /* Netgraph type */ static struct ng_type typestruct = { NG_VERSION, NG_ECHO_NODE_TYPE, NULL, NULL, nge_rcvmsg, NULL, NULL, NULL, NULL, nge_rcvdata, nge_rcvdata, nge_disconnect, NULL }; NETGRAPH_INIT(echo, &typestruct); /* * Receive control message. We just bounce it back as a reply. */ static int nge_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) { if (rptr) { msg->header.flags |= NGF_RESP; *rptr = msg; } else { kfree(msg, M_NETGRAPH); } return (0); } /* * Receive data */ static int nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) { int error = 0; NG_SEND_DATA(error, hook, m, meta); return (error); } /* * Removal of the last link destroys the nodeo */ static int nge_disconnect(hook_p hook) { if (hook->node->numhooks == 0) ng_rmnode(hook->node); return (0); }