575ee59b1c
and add a sysctl to pppoe to activate non standard ethertypes so that idiot ISPs (apparently in France) who use equipment from idiot suppliers (rumour says 3com) who use nonstandard ethertypes can still connect. "yep, sure we do pppoe, we use a different identifier to that dictated in the standard, but sure it's pppoe!" sysctl -w net.graph.stupid_isp=1 enables the changeover.
420 lines
14 KiB
Groff
420 lines
14 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@FreeBSD.org>
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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 4
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.Os FreeBSD
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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 <net/ethernet.h>
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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 pppoe
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node type performs the PPPoE protocol. It is used in conjunction with the
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.Xr netgraph 4
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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 argument. 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 listener. 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 service 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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.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; /* service name length */
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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 immediately 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 immediately after sending this
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message. At present this message is not yet used and a 'failed' message
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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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.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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.Ed
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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 disconnected.
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.Sh SYSCTLs
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If you are one of the unfortunate people who have an ISP that
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uses some "pppoe" equipment from (I believe) 3com, and who have to
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use a different ethertype on pppoe packets
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(hey why not change it from the standard for
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no reason?) then after you have kldloaded or compiled in your pppoe node,
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you may have to do the following sysctl:
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.Bd -literal
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(kldload netgraph)
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(kldload ng_pppoe)
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sysctl -w net.graph.stupid_isp=1
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.Ed
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.Pp
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to enable the alternate ethertypes. Then phone your ISP and ask them
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why you need to set option "stupid_isp" for you to be able to connect.
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.Sh EXAMPLES
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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 someone 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 4 ,
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.Xr ng_ppp 4 ,
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.Xr ngctl 8
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.Rs
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.%A L. Mamakos
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.%A K. Lidl
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.%A J. Evarts
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.%A D. Carrel
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|
.%A D. Simone
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.%A R. Wheeler
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.%T "A Method for transmitting PPP over Ethernet (PPPoE)"
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.%O RFC 2516
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.Re
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.0 .
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.Sh AUTHORS
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|
.An Julian Elischer Aq julian@FreeBSD.org
|