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authorOle Troan <ot@cisco.com>2022-03-17 11:58:38 +0100
committerOle Tr�an <otroan@employees.org>2022-04-21 10:35:58 +0000
commit5297447bd64ab253ab3ab3e144605dd39f995f12 (patch)
treed351435893287349ebb9ca5736a627ff53cc28f9 /src/vat
parente0c875551fa0cd49131671be0f521801e06764f8 (diff)
nat: tweak rfc7857 tcp connection tracking
The RFC7857 state machine introduced in 56c492a is a trade-off. It tries to retain sessions as much as possible and also offers some protection against spurious RST by re-establishing sessions if data is received after the RST. From experience in the wild, this algorithm is a little too liberal, as it leaves too many spurious established sessions in the session table. E.g. a oberserved pattern is: client server <- FIN, ACK ACK -> ACK -> RST, ACK -> With the current state machine this would leave the session in established state. These proposed changes do: - require 3-way handshake to establish session. (current requires only to see SYNs from both sides) - RST will move session to transitory without recovery if data is sent after - Only a single FIN is needed to move to transitory Fixes: 56c492aa0502751de2dd9d890096a82c5f04776d Type: fix Signed-off-by: Ole Troan <ot@cisco.com> Change-Id: I92e593e00b2efe48d04997642d85bd59e0eaa2ea Signed-off-by: Ole Troan <ot@cisco.com>
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