diff options
Diffstat (limited to 'sys/netgraph/ng_echo.c')
-rw-r--r-- | sys/netgraph/ng_echo.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/sys/netgraph/ng_echo.c b/sys/netgraph/ng_echo.c new file mode 100644 index 0000000..ed69f9c --- /dev/null +++ b/sys/netgraph/ng_echo.c @@ -0,0 +1,121 @@ + +/* + * 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 <julian@whistle.com> + * + * $FreeBSD$ + * $Whistle: ng_echo.c,v 1.11 1999/01/28 23:54:53 julian Exp $ + */ + +/* + * Netgraph "echo" node + * + * This node simply bounces data and messages back to whence they came. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/errno.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/syslog.h> +#include <netgraph/ng_message.h> +#include <netgraph/netgraph.h> +#include <netgraph/ng_echo.h> + +/* Netgraph methods */ +static int nge_rcvmsg(node_p node, struct ng_mesg *msg, + const char *retaddr, struct ng_mesg ** resp); +static int nge_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); +static int nge_disconnect(hook_p hook); + +/* 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 +}; +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 { + FREE(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); +} + |