Update to reflect changed functionality.
This commit is contained in:
Archie Cobbs
parent
19a52c592d
commit
debfa5183b
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@ -58,8 +58,7 @@ hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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hook as a single frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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@ -67,11 +66,14 @@ hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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Received packets should start with the address and control fields,
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or the PPP protocol field if address and control field compression
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is employed, and contain no checksum field. If the first four bytes are
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.Dv "0xff 0x03 0xc0 0x21"
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(an LCP protocol frame) then complete control character escaping
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is enabled for that frame (in PPP, LCP packets are always sent with
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no address and control field compression and all control characters
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escaped).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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@ -89,10 +91,10 @@ Typically this hook would be connected to a
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.Xr ng_tty 8
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node, which handles transmission of serial data over a tty device.
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.It Dv sync
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to a link hook of a
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames should contain address, control, and protocol fields,
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but no checksum field.
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Typically this hook would be connected to an individual link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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@ -111,7 +113,6 @@ Sets the node configuration, which is described by a
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.Bd -literal -offset 4n
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struct ng_async_cfg {
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u_char enabled; /* Turn encoding on/off */
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u_char acfcomp; /* Address/control field comp. */
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u_int16_t amru; /* Max receive async frame len */
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u_int16_t smru; /* Max receive sync frame len */
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u_int32_t accm; /* ACCM encoding */
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@ -121,21 +122,17 @@ struct ng_async_cfg {
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The
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.Dv enabled
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field enables or disables all encoding/decoding functions (default disabled).
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When disabled, the node operates in simple ``pass through'' mode. Setting
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.Dv acfcomp
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enables address and control field compression on transmission (for packets
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received on the
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.Dv sync
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hook only; default off).
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When disabled, the node operates in simple ``pass through'' mode.
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The
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.Dv amru
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and
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.Dv smru
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are the asynchronous and synchronous MRU (maximum receive unit) values,
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respectively. These both default to 1600; note that the async MRU
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fields are the asynchronous and synchronous MRU (maximum receive unit) values,
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respectively. These both default to 1600; note that the async MRU
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applies to the incoming frame length after asynchronous decoding.
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Finally,
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The
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.Dv accm
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is the asynchronous character control map, which controls the escaping
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field is the asynchronous character control map, which controls the escaping
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of characters 0x00 thorough 0x1f (default 0xffffffff).
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.It Dv NGM_ASYNC_CMD_GET_CONFIG
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This command returns the current configuration structure.
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@ -154,5 +151,10 @@ control message, or when all hooks have been disconnected.
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.%T "PPP in HDLC-link Framing"
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.%O RFC 1662
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.Re
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.Rs
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.%A W. Simpson
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.%T "The Point-to-Point Protocol (PPP)"
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.%O RFC 1661
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.Re
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.Sh AUTHOR
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Archie Cobbs <archie@whistle.com>
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@ -58,8 +58,7 @@ hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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hook as a single frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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@ -67,11 +66,14 @@ hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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Received packets should start with the address and control fields,
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or the PPP protocol field if address and control field compression
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is employed, and contain no checksum field. If the first four bytes are
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.Dv "0xff 0x03 0xc0 0x21"
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(an LCP protocol frame) then complete control character escaping
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is enabled for that frame (in PPP, LCP packets are always sent with
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no address and control field compression and all control characters
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escaped).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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@ -89,10 +91,10 @@ Typically this hook would be connected to a
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.Xr ng_tty 8
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node, which handles transmission of serial data over a tty device.
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.It Dv sync
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to a link hook of a
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames should contain address, control, and protocol fields,
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but no checksum field.
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Typically this hook would be connected to an individual link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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@ -111,7 +113,6 @@ Sets the node configuration, which is described by a
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.Bd -literal -offset 4n
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struct ng_async_cfg {
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u_char enabled; /* Turn encoding on/off */
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u_char acfcomp; /* Address/control field comp. */
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u_int16_t amru; /* Max receive async frame len */
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u_int16_t smru; /* Max receive sync frame len */
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u_int32_t accm; /* ACCM encoding */
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@ -121,21 +122,17 @@ struct ng_async_cfg {
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The
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.Dv enabled
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field enables or disables all encoding/decoding functions (default disabled).
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When disabled, the node operates in simple ``pass through'' mode. Setting
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.Dv acfcomp
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enables address and control field compression on transmission (for packets
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received on the
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.Dv sync
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hook only; default off).
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When disabled, the node operates in simple ``pass through'' mode.
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The
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.Dv amru
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and
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.Dv smru
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are the asynchronous and synchronous MRU (maximum receive unit) values,
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respectively. These both default to 1600; note that the async MRU
|
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fields are the asynchronous and synchronous MRU (maximum receive unit) values,
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respectively. These both default to 1600; note that the async MRU
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applies to the incoming frame length after asynchronous decoding.
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Finally,
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The
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.Dv accm
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is the asynchronous character control map, which controls the escaping
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field is the asynchronous character control map, which controls the escaping
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of characters 0x00 thorough 0x1f (default 0xffffffff).
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.It Dv NGM_ASYNC_CMD_GET_CONFIG
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This command returns the current configuration structure.
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@ -154,5 +151,10 @@ control message, or when all hooks have been disconnected.
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.%T "PPP in HDLC-link Framing"
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.%O RFC 1662
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.Re
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.Rs
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.%A W. Simpson
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.%T "The Point-to-Point Protocol (PPP)"
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.%O RFC 1661
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.Re
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.Sh AUTHOR
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Archie Cobbs <archie@whistle.com>
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@ -58,8 +58,7 @@ hook. Mbuf boundaries of incoming data are ignored.
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Once a complete packet has been received, it is decoded and
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stripped of all framing bytes, and transmitted out the
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.Dv sync
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hook as a single frame. The address and control bytes,
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if present, are removed from the beginning of the frame.
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hook as a single frame.
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.Pp
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Synchronous frames are transmitted and received on the
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.Dv sync
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|
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@ -67,11 +66,14 @@ hook.
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Packets received on this hook are encoded as asynchronous frames
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and sent out on
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.Dv async .
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Received packets should start with the PPP protocol field.
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If the LCP protocol (0xc021) is detected,
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address and control field compression is disabled
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and complete control character escaping is enabled for that frame
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(in PPP, LCP packets are always sent with these settings).
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Received packets should start with the address and control fields,
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or the PPP protocol field if address and control field compression
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is employed, and contain no checksum field. If the first four bytes are
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.Dv "0xff 0x03 0xc0 0x21"
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(an LCP protocol frame) then complete control character escaping
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is enabled for that frame (in PPP, LCP packets are always sent with
|
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no address and control field compression and all control characters
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escaped).
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.Pp
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This node supports ``flag sharing'' for packets transmitted on
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.Dv async .
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|
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@ -89,10 +91,10 @@ Typically this hook would be connected to a
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.Xr ng_tty 8
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node, which handles transmission of serial data over a tty device.
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.It Dv sync
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames contain no address, control, or checksum fields;
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each frame begins with the PPP protocol number. Typically this hook would
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be connected to a link hook of a
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Synchronous connection. This hook sends and receives synchronous frames.
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For PPP, these frames should contain address, control, and protocol fields,
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but no checksum field.
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Typically this hook would be connected to an individual link hook of a
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.Xr ng_ppp 8
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type node.
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.El
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@ -111,7 +113,6 @@ Sets the node configuration, which is described by a
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.Bd -literal -offset 4n
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struct ng_async_cfg {
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u_char enabled; /* Turn encoding on/off */
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u_char acfcomp; /* Address/control field comp. */
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u_int16_t amru; /* Max receive async frame len */
|
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u_int16_t smru; /* Max receive sync frame len */
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u_int32_t accm; /* ACCM encoding */
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|
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@ -121,21 +122,17 @@ struct ng_async_cfg {
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The
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.Dv enabled
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field enables or disables all encoding/decoding functions (default disabled).
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When disabled, the node operates in simple ``pass through'' mode. Setting
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.Dv acfcomp
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enables address and control field compression on transmission (for packets
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received on the
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.Dv sync
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hook only; default off).
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When disabled, the node operates in simple ``pass through'' mode.
|
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The
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.Dv amru
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and
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.Dv smru
|
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are the asynchronous and synchronous MRU (maximum receive unit) values,
|
||||
respectively. These both default to 1600; note that the async MRU
|
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fields are the asynchronous and synchronous MRU (maximum receive unit) values,
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respectively. These both default to 1600; note that the async MRU
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applies to the incoming frame length after asynchronous decoding.
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Finally,
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The
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.Dv accm
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is the asynchronous character control map, which controls the escaping
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field is the asynchronous character control map, which controls the escaping
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of characters 0x00 thorough 0x1f (default 0xffffffff).
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.It Dv NGM_ASYNC_CMD_GET_CONFIG
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This command returns the current configuration structure.
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|
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@ -154,5 +151,10 @@ control message, or when all hooks have been disconnected.
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.%T "PPP in HDLC-link Framing"
|
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.%O RFC 1662
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||||
.Re
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||||
.Rs
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||||
.%A W. Simpson
|
||||
.%T "The Point-to-Point Protocol (PPP)"
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.%O RFC 1661
|
||||
.Re
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||||
.Sh AUTHOR
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||||
Archie Cobbs <archie@whistle.com>
|
||||
|
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