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mdoc(7) police: bump document date, fix markup.

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ru 2001-12-08 16:40:19 +00:00
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45
share/man/man4/ng_pptpgre.4
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@ -35,7 +35,7 @@
.\" $FreeBSD$
.\" $Whistle: ng_pptpgre.8,v 1.2 1999/12/08 00:20:53 archie Exp $
.\"
.Dd November 29, 1999
.Dd December 7, 2001
.Dt NG_PPTPGRE 4
.Os
.Sh NAME
@ -47,44 +47,46 @@
The
.Nm pptpgre
node type performs Generic Routing Encapsulation (GRE) over IP
for the PPTP protocol as specified by RFC 2637. This involves packet
for the PPTP protocol as specified by RFC 2637.
This involves packet
encapsulation, sequencing, acknowlegement, and an adaptive timeout
sliding window mechanism. This node type does not handle any of
sliding window mechanism.
This node type does not handle any of
the TCP control protocol or call negotiation defined by PPTP.
.Pp
This node type expects to receive complete IP packets,
including the IP header, on the
.Dv lower
.Dq Li lower
hook, but it transmits outgoing frames without any IP header.
The typical use for this node type would be to connect the
.Dv upper
.Dq Li upper
hook to one of the link hooks of a
.Xr ng_ppp 4
node, and the
.Dv lower
.Dq Li lower
hook to the
.Dv "inet/raw/gre"
.Dq Li "inet/raw/gre"
hook of a
.Xr ng_ksocket 4
node.
.Sh HOOKS
This node type supports the following hooks:
.Pp
.Bl -tag -compact -width vjc_vjuncomp
.It Dv upper
.Bl -tag -compact -width ".Li upper"
.It Li upper
Connection to the upper protocol layers
.It Dv lower
.It Li lower
Connection to the lower protocol layers
.El
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width foo
.Bl -tag -width indent
.It Dv NGM_PPTPGRE_SET_CONFIG
This command resets and configures the node for a session.
This command takes a
.Dv "struct ng_pptpgre_conf"
.Vt "struct ng_pptpgre_conf"
as an argument:
.Bd -literal -offset 0n
.Bd -literal
/* Configuration for a session */
struct ng_pptpgre_conf {
u_char enabled; /* enables traffic flow */
@ -96,30 +98,31 @@ struct ng_pptpgre_conf {
u_int16_t peerPpd; /* peer packet processing delay
(in 1/10 of a second) */
};
.Ed
.Pp
The
.Dv enabled
field enables traffic flow through the node. The
.Dv enableDelayedAck
.Va enabled
field enables traffic flow through the node.
The
.Va enableDelayedAck
field enables delayed acknowledgement (maximum 250 miliseconds), which
is a useful optimization and should generally be turned on.
.Dv enableAlwaysAck
.Va enableAlwaysAck
field enables sending acknowledgements with every data packet, which
is probably helpful as well.
The remaining fields are as supplied by the PPTP virtual call setup process.
.It Dv NGM_PPTPGRE_GET_CONFIG
Returns the current configuration as a
.Dv "struct ng_pptpgre_conf" .
.Vt "struct ng_pptpgre_conf" .
.It Dv NGM_PPTPGRE_GET_STATS
This command returns a
.Dv "struct ng_pptpgre_stats"
.Vt "struct ng_pptpgre_stats"
containing various node statistics.
.It Dv NGM_PPTPGRE_CLR_STATS
This command resets the node statistics.
.It Dv NGM_PPTPGRE_GETCLR_STATS
This command atomically gets and resets the node statistics, returning a
.Dv "struct ng_pptpgre_stats" .
.Vt "struct ng_pptpgre_stats" .
.El
.Sh SHUTDOWN
This node shuts down upon receipt of a