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| author | Phil Sutter <phil@nwl.cc> | 2020-12-02 18:58:01 +0100 |
|---|---|---|
| committer | Phil Sutter <phil@nwl.cc> | 2020-12-08 13:38:46 +0100 |
| commit | 08a04414f24e21a07e58c2ccc750e1a57d4da6b6 (patch) | |
| tree | b4bcd3432987749fc42060f9516c1b9b7cc6ec24 /doc/data-types.txt | |
| parent | d357e27aa45870f2955d7a57c7c860d3ec7145c4 (diff) | |
doc: Document 'dccp type' match
Add a description of dccp_pkttype and extend DCCP header expression
synopsis by the 'type' argument.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Diffstat (limited to 'doc/data-types.txt')
| -rw-r--r-- | doc/data-types.txt | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/doc/data-types.txt b/doc/data-types.txt index a42a55fa..961fc624 100644 --- a/doc/data-types.txt +++ b/doc/data-types.txt @@ -492,3 +492,46 @@ For each of the types above, keywords are available for convenience: |================== Possible keywords for conntrack label type (ct_label) are read at runtime from /etc/connlabel.conf. + +DCCP PKTTYPE TYPE +~~~~~~~~~~~~~~~~ +[options="header"] +|================== +|Name | Keyword | Size | Base type +|DCCP packet type | +dccp_pkttype | +4 bit | +integer +|=================== + +The DCCP packet type abstracts the different legal values of the respective +four bit field in the DCCP header, as stated by RFC4340. Note that possible +values 10-15 are considered reserved and therefore not allowed to be used. In +iptables' *dccp* match, these values are aliased 'INVALID'. With nftables, one +may simply match on the numeric value range, i.e. *10-15*. + +.keywords may be used when specifying the DCCP packet type +[options="header"] +|================== +|Keyword |Value +|request| +0 +|response| +1 +|data| +2 +|ack| +3 +|dataack| +4 +|closereq| +5 +|close| +6 +|reset| +7 +|sync| +8 +|syncack| +9 +|================= |