From 36efa471ac6aff2e0085cdb31ea71ad43438883f Mon Sep 17 00:00:00 2001 From: julian Date: Thu, 25 Dec 2008 00:01:29 +0000 Subject: Add a trivial node to reflect ethernet frames to whence they came. MFC after: 1 month --- sys/netgraph/ng_ether_echo.c | 145 +++++++++++++++++++++++++++++++++++++++++++ sys/netgraph/ng_ether_echo.h | 51 +++++++++++++++ 2 files changed, 196 insertions(+) create mode 100644 sys/netgraph/ng_ether_echo.c create mode 100644 sys/netgraph/ng_ether_echo.h (limited to 'sys/netgraph') diff --git a/sys/netgraph/ng_ether_echo.c b/sys/netgraph/ng_ether_echo.c new file mode 100644 index 0000000..4064bc3 --- /dev/null +++ b/sys/netgraph/ng_ether_echo.c @@ -0,0 +1,145 @@ +/* + * ng_ether_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 + * + * $FreeBSD$ + * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $ + */ + +/* + * Netgraph "ether_echo" node + * + * This node simply bounces data and messages back to whence they came. + * However it swaps the source and destination ether fields. + * No testing is done! + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/* Netgraph methods */ +static ng_constructor_t ngee_cons; +static ng_rcvmsg_t ngee_rcvmsg; +static ng_rcvdata_t ngee_rcvdata; +static ng_disconnect_t ngee_disconnect; + +/* Netgraph type */ +static struct ng_type typestruct = { + .version = NG_ABI_VERSION, + .name = NG_ETHER_ECHO_NODE_TYPE, + .constructor = ngee_cons, + .rcvmsg = ngee_rcvmsg, + .rcvdata = ngee_rcvdata, + .disconnect = ngee_disconnect, +}; +NETGRAPH_INIT(ether_echo, &typestruct); + +static int +ngee_cons(node_p node) +{ + return (0); +} + +/* + * Receive control message. We just bounce it back as a reply. + */ +static int +ngee_rcvmsg(node_p node, item_p item, hook_p lasthook) +{ + struct ng_mesg *msg; + int error = 0; + + NGI_GET_MSG(item, msg); + msg->header.flags |= NGF_RESP; + NG_RESPOND_MSG(error, node, item, msg); + return (error); +} + +/* + * Receive data + */ +static int +ngee_rcvdata(hook_p hook, item_p item) +{ + int error; + struct mbuf *m; + + struct ether_header *eh; + struct ether_addr tmpaddr; + + /* Make sure we have an entire header */ + NGI_GET_M(item, m); + if (m->m_len < sizeof(*eh) ) { + m = m_pullup(m, sizeof(*eh)); + if (m == NULL) { + NG_FREE_ITEM(item); + return(EINVAL); + } + } + eh = mtod(m, struct ether_header *); + + /* swap the source and destination fields */ + bcopy(eh->ether_dhost, &tmpaddr, ETHER_ADDR_LEN); + bcopy(eh->ether_shost, eh->ether_dhost, ETHER_ADDR_LEN); + bcopy(&tmpaddr, eh->ether_shost, ETHER_ADDR_LEN); + + NG_FWD_NEW_DATA(error, item, hook, m); + return (error); +} + +/* + * Removal of the last link destroys the nodeo + */ +static int +ngee_disconnect(hook_p hook) +{ + if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) + && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { + ng_rmnode_self(NG_HOOK_NODE(hook)); + } + return (0); +} + diff --git a/sys/netgraph/ng_ether_echo.h b/sys/netgraph/ng_ether_echo.h new file mode 100644 index 0000000..4b63808 --- /dev/null +++ b/sys/netgraph/ng_ether_echo.h @@ -0,0 +1,51 @@ +/* + * ng_ether_echo.h + */ + +/*- + * 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: Archie Cobbs + * + * $FreeBSD$ + * $Whistle: ng_echo.h,v 1.3 1999/01/20 00:22:12 archie Exp $ + */ + +#ifndef _NETGRAPH_NG_ETHER_ECHO_H_ +#define _NETGRAPH_NG_ETHER_ECHO_H_ + +/* Node type name and magic cookie */ +#define NG_ETHER_ECHO_NODE_TYPE "ether_echo" +#define NGM_ETHER_ECHO_COOKIE 1230155201 + +#endif /* _NETGRAPH_NG_ETHER_ECHO_H_ */ -- cgit v1.1