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author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-10-11 20:35:40 +0200 |
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committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-10-12 06:57:40 +0200 |
commit | 0b53d4604ac2b4f2faa9a62a04ea9b383ad2efe0 (patch) | |
tree | 70ed0d136ef719f33655f78b31650d1c88cd3e00 /Documentation/logo.txt | |
parent | 0ed8ddf4045fcfcac36bad753dc4046118c603ec (diff) | |
download | linux-0b53d4604ac2b4f2faa9a62a04ea9b383ad2efe0.tar.bz2 |
dccp: fix the adjustments to AWL and SWL
This fixes a problem and a potential loophole with regard to seqno/ackno
validity: currently the initial adjustments to AWL/SWL are only performed
once at the begin of the connection, during the handshake.
Since the Sequence Window feature is always greater than Wmin=32 (7.5.2),
it is however necessary to perform these adjustments at least for the first
W/W' (variables as per 7.5.1) packets in the lifetime of a connection.
This requirement is complicated by the fact that W/W' can change at any time
during the lifetime of a connection.
Therefore it is better to perform that safety check each time SWL/AWL are
updated, as implemented by the patch.
A second problem solved by this patch is that the remote/local Sequence Window
feature values (which set the bounds for AWL/SWL/SWH) are undefined until the
feature negotiation has completed.
During the initial handshake we have more stringent sequence number protection;
the changes added by this patch effect that {A,S}W{L,H} are within the correct
bounds at the instant that feature negotiation completes (since the SeqWin
feature activation handlers call dccp_update_gsr/gss()).
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'Documentation/logo.txt')
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