395 lines
13 KiB
Groff
395 lines
13 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@whistle.com>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_pppoe.8,v 1.1 1999/01/25 23:46:27 archie Exp $
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.\"
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.Dd October 28, 1999
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.Dt NG_PPPOE 8
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.Os FreeBSD 3
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.Sh NAME
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.Nm ng_pppoe
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.Nd RFC-2516 PPPOE protocol netgraph node type
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.Sh SYNOPSIS
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.Fd #include <netgraph/ng_pppoe.h>
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.Sh DESCRIPTION
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The
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.Nm
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node type performs the PPPoE protocol. It is used in conjunction with a the
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.Dv Netgraph
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extensions to the ethernet framework to divert and inject ethernet packets
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to and from a PPP agent (which is not specified).
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.Pp
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The
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.Dv NGM_PPPOE_GET_STATUS
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control message can be used at any time to query the current status
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of the PPPOE module. The only statistics presently available are the
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total packet counts for input and output. This node does not yet support
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the
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.Dv NGM_TEXT_STATUS
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control message.
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.Sh HOOKS
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This node type supports the following hooks:
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.Pp
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.Bl -tag -width foobarbaz
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.It Dv ethernet
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The hook that should normally be connected to an ethernet node.
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.It Dv debug
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Presently no use.
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.It Dv [unspecified]
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Any other name is assumed to be a session hook that will be connected to
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a PPP client agent, or a ppp server agent.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_PPPOE_GET_STATUS
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This command returns status information in a
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.Dv "struct ngpppoestat" :
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.Bd -literal -offset 4n
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struct ngpppoestat {
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u_int packets_in; /* packets in from ethernet */
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u_int packets_out; /* packets out towards ethernet */
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};
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.Ed
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.It Dv NGM_TEXT_STATUS
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This generic message returns is a human-readable version of the node status.
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(not yet)
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.It Dv NGM_PPPOE_CONNECT
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Tell a nominated newly created hook that it's session should enter
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the state machine in a manner to become a client. It must be newly created and
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a service name can be given as an agument. It is legal to specify a zero length
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service name. This is common on some DSL setups. A session request packet
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will be broadcast on the ethernet.
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This command uses the
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.Dv ngpppoe_init_data
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structure shown below.
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.It Dv NGM_PPPOE_LISTEN
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Tell a nominated newly created hook that it's session should enter
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the state machine in a manner to become a server listenner. The argument
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given is the name of the service to listen on behalf of. A zero length service
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length will match all requests for service. A matching ervice request
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packet will be passed unmodified back to the process responsible
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for starting the service. It can then examine it and pass it on to
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the session that is started to answer the request.
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This command uses the
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.Dv ngpppoe_init_data
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structure shown below.
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.It Dv NGM_PPPOE_OFFER
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Tell a nominated newly created hook that it's session should enter
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the state machine in a manner to become a server. The argument
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given is the name of the service to offer. A zero length service
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is legal. The State machine will progress to a state where it will await
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a request packet to be forwarded to it from the startup server,
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which in turn probably received it from a LISTEN mode hook ( see above).
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This is so
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that information that is required for the session that is embedded in
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the original session request packet, is made available to the state machine
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that eventually answers the request. When the Session request packet is
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received, the session negotiation will proceed.
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This command uses the
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.Dv ngpppoe_init_data
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structure shown below.
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.Pp
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The three commands above use a common data structure.
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.Dv "struct ngpppoe_init_data"
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.Bd -literal -offset 4n
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struct ngpppoe_init_data {
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char hook[NG_HOOKLEN + 1]; /* hook to monitor on */
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u_int16_t data_len; /* Length of the service name */
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char data[0]; /* init data goes here */
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};
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.Ed
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.It Dv NGM_PPPOE_SUCCESS
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This command is sent to the node that started this session with one of the
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above messages, and reports a state change. This message reports
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successful Session negotiation. It uses the structure shown below, and
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reports back the hook name corresponding to the successful session.
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.It Dv NGM_NGM_PPPOE_FAIL
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This command is sent to the node that started this session with one of the
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above messages, and reports a state change. This message reports
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failed Session negotiation. It uses the structure shown below, and
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reports back the hook name corresponding to the failed session.
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The hook will probably have been removed immediatly after sending this message
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.It Dv NGM_NGM_PPPOE_CLOSE
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This command is sent to the node that started this session with one of the
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above messages, and reports a state change. This message reports
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a request to close a session. It uses the structure shown below, and
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reports back the hook name corresponding to the closed session.
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The hook will probably have been removed immediatly after sending this
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message. At present this message is not yet used and a 'failed' mesage
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will be received at closure instead.
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.Pp
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The three commands above use a common data structure.
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.Dv "struct ngpppoe_sts"
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.Bd -literal -offset 4n
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struct ngpppoe_sts {
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char hook[NG_HOOKLEN + 1]; /* hook associated with event session */
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};
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, when all session have been disconnected or when the
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.Dv ethernet
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hook is disconected.
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.Sh EXAMPLE USAGE
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The following code uses
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.Dv libnetgraph
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to set up a
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.Nm
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node and connect it to both a socket node and an ethernet node. It can handle
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the case of when a
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.Nm
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node is already attached to the ethernet. It then starts a client session.
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.Bd -literal
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <sysexits.h>
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#include <errno.h>
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#include <err.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <net/ethernet.h>
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#include <netgraph.h>
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#include <netgraph/ng_ether.h>
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#include <netgraph/ng_pppoe.h>
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#include <netgraph/ng_socket.h>
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static int setup(char *ethername, char *service, char *sessname,
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int *dfd, int *cfd);
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int
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main()
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{
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int fd1, fd2;
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setup("xl0", NULL, "fred", &fd1, &fd2);
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sleep (30);
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}
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static int
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setup(char *ethername, char *service, char *sessname,
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int *dfd, int *cfd)
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{
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struct ngm_connect ngc; /* connect */
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struct ngm_mkpeer mkp; /* mkpeer */
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/******** nodeinfo stuff **********/
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u_char rbuf[2 * 1024];
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struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
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struct hooklist *const hlist
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= (struct hooklist *) resp->data;
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struct nodeinfo *const ninfo = &hlist->nodeinfo;
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int ch, no_hooks = 0;
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struct linkinfo *link;
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struct nodeinfo *peer;
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/****message to connect pppoe session*****/
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struct {
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struct ngPPPoE_init_data idata;
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char service[100];
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} message;
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/********tracking our little graph ********/
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char path[100];
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char source_ID[NG_NODELEN + 1];
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char pppoe_node_name[100];
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int k;
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/*
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* Create the data and control sockets
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*/
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if (NgMkSockNode(NULL, cfd, dfd) < 0) {
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return (errno);
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}
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/*
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* find the ether node of the name requested by asking it for
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* it's inquiry information.
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*/
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if (strlen(ethername) > 16)
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return (EINVAL);
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sprintf(path, "%s:", ethername);
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if (NgSendMsg(*cfd, path, NGM_GENERIC_COOKIE,
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NGM_LISTHOOKS, NULL, 0) < 0) {
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return (errno);
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}
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/*
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* the command was accepted so it exists. Await the reply (It's
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* almost certainly already waiting).
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*/
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if (NgRecvMsg(*cfd, resp, sizeof(rbuf), NULL) < 0) {
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return (errno);
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}
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/**
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* The following is available about the node:
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* ninfo->name (string)
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* ninfo->type (string)
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* ninfo->id (u_int32_t)
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* ninfo->hooks (u_int32_t) (count of hooks)
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* check it is the correct type. and get it's ID for use
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* with mkpeer later.
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*/
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if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
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strlen(NG_ETHER_NODE_TYPE)) != 0) {
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return (EPROTOTYPE);
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}
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sprintf(source_ID, "[%08x]:", ninfo->id);
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/*
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* look for a hook already attached.
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*/
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for (k = 0; k < ninfo->hooks; k++) {
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/**
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* The following are available about each hook.
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* link->ourhook (string)
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* link->peerhook (string)
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* peer->name (string)
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* peer->type (string)
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* peer->id (u_int32_t)
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* peer->hooks (u_int32_t)
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*/
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link = &hlist->link[k];
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peer = &hlist->link[k].nodeinfo;
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/* Ignore debug hooks */
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if (strcmp("debug", link->ourhook) == 0)
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continue;
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/* If the orphans hook is attached, use that */
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if (strcmp(NG_ETHER_HOOK_ORPHAN,
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link->ourhook) == 0) {
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break;
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}
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/* the other option is the 'divert' hook */
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if (strcmp("NG_ETHER_HOOK_DIVERT",
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link->ourhook) == 0) {
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break;
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}
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}
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/*
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* See if we found a hook there.
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*/
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if (k < ninfo->hooks) {
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if (strcmp(peer->type, NG_PPPOE_NODE_TYPE) == 0) {
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/*
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* If it's a type pppoe, we skip making one
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* ourself, but we continue, using
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* the existing one.
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*/
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sprintf(pppoe_node_name, "[%08x]:", peer->id);
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} else {
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/*
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* There is already someon hogging the data,
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* return * an error. Some day we'll try
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* daisy-chaining..
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*/
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return (EBUSY);
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}
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} else {
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/*
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* Try make a node of type pppoe against node "ID"
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* On hook NG_ETHER_HOOK_ORPHAN.
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*/
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snprintf(mkp.type, sizeof(mkp.type),
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"%s", NG_PPPOE_NODE_TYPE);
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snprintf(mkp.ourhook, sizeof(mkp.ourhook),
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"%s", NG_ETHER_HOOK_ORPHAN);
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snprintf(mkp.peerhook, sizeof(mkp.peerhook),
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"%s", NG_PPPOE_HOOK_ETHERNET);
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/* Send message */
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if (NgSendMsg(*cfd, source_ID, NGM_GENERIC_COOKIE,
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NGM_MKPEER, &mkp, sizeof(mkp)) < 0) {
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return (errno);
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}
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/*
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* Work out a name for the new node.
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*/
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sprintf(pppoe_node_name, "%s:%s",
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source_ID, NG_ETHER_HOOK_ORPHAN);
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}
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/*
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* We now have a pppoe node attached to the ethernet
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* card. The Ethernet is addressed as ethername: The pppoe
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* node is addressed as pppoe_node_name: attach to it.
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* Connect socket node to specified node Use the same hook
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* name on both ends of the link.
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*/
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snprintf(ngc.path, sizeof(ngc.path), "%s", pppoe_node_name);
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snprintf(ngc.ourhook, sizeof(ngc.ourhook), "%s", sessname);
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snprintf(ngc.peerhook, sizeof(ngc.peerhook), "%s", sessname);
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if (NgSendMsg(*cfd, ".:", NGM_GENERIC_COOKIE,
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NGM_CONNECT, &ngc, sizeof(ngc)) < 0) {
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return (errno);
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}
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/*
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* Send it a message telling it to start up.
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*/
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bzero(&message, sizeof(message));
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snprintf(message.idata.hook, sizeof(message.idata.hook),
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"%s", sessname);
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if (service == NULL) {
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message.idata.data_len = 0;
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} else {
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snprintf(message.idata.data,
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sizeof(message.idata.data), "%s", service);
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message.idata.data_len = strlen(service);
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}
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/* Tell session/hook to start up as a client */
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if (NgSendMsg(*cfd, ngc.path,
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NGM_PPPOE_COOKIE, NGM_PPPOE_CONNECT, &message.idata,
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sizeof(message.idata) + message.idata.data_len) < 0) {
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return (errno);
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}
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return (0);
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}
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.Ed
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.Sh SEE ALSO
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.Xr netgraph 3 ,
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.Xr netgraph 4 ,
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.Xr ng_socket 8 ,
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.Xr ngctl 8 .
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.Rs
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.%T "RFC 2516 - A Method of transmitting PPP over Ethernet (PPPoE)"
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.Re
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.Sh AUTHOR
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Julian Elisher <julian@whistle.com>
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