[NETFILTER]: nf_conntrack_tcp: fix connection reopening
With your description I could reproduce the bug and actually you were completely right: the code above is incorrect. Somehow I was able to misread RFC1122 and mixed the roles :-(: When a connection is >>closed actively<<, it MUST linger in TIME-WAIT state for a time 2xMSL (Maximum Segment Lifetime). However, it MAY >>accept<< a new SYN from the remote TCP to reopen the connection directly from TIME-WAIT state, if it: [...] The fix is as follows: if the receiver initiated an active close, then the sender may reopen the connection - otherwise try to figure out if we hold a dead connection. Signed-off-by: NJozsef Kadlecsik <kadlec@blackhole.kfki.hu> Tested-by: NKrzysztof Piotr Oledzki <ole@ans.pl> Signed-off-by: NPatrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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