On Mon, 9 Nov 2020 12:59:30 +0530 nusiddiq@xxxxxxxxxx wrote: > From: Numan Siddique <nusiddiq@xxxxxxxxxx> > > Before calling nf_conntrack_in(), caller can set this flag in the > connection template for a tcp packet and any errors in the > tcp_in_window() will be ignored. > > A helper function - nf_ct_set_tcp_be_liberal(nf_conn) is added which > sets this flag for both the directions of the nf_conn. > > openvswitch makes use of this feature so that any out of window tcp > packets are not marked invalid. Prior to this there was no easy way > to distinguish if conntracked packet is marked invalid because of > tcp_in_window() check error or because it doesn't belong to an > existing connection. > > An earlier attempt (see the link) tried to solve this problem for > openvswitch in a different way. Florian Westphal instead suggested > to be liberal in openvswitch for tcp packets. > > Link: https://patchwork.ozlabs.org/project/netdev/patch/20201006083355.121018-1-nusiddiq@xxxxxxxxxx/ > > Suggested-by: Florian Westphal <fw@xxxxxxxxx> > Signed-off-by: Numan Siddique <nusiddiq@xxxxxxxxxx> Please repost Ccing Pablo & netfilter-devel.
