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netfilter: nft_flow_offload: add entry to flowtable after confirmation

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[ Upstream commit 270a8a297f42ecff82060aaa53118361f09c1f7d ]

This is fixing flow offload for UDP traffic where packets only follow
one single direction.

The flow_offload_fixup_tcp() mechanism works fine in case that the
offloaded entry remains in SYN_RECV state, given sequence tracking is
reset and that conntrack handles syn+ack packets as a retransmission, ie.

	sES + synack => sIG

for reply traffic.

Fixes: a3c90f7a23 ("netfilter: nf_tables: flow offload expression")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2019-04-29 11:54:56 +02:00 • committed by Greg Kroah-Hartman
parent 7939468446
commit 8480fbeb0b
1 changed files with 1 additions and 2 deletions

3
net/netfilter/nft_flow_offload.c
View file

@ -103,8 +103,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
ct->status & IPS_SEQ_ADJUST)
goto out;
if (ctinfo == IP_CT_NEW ||
ctinfo == IP_CT_RELATED)
if (!nf_ct_is_confirmed(ct))
goto out;
if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))