Commit 270a8a29 authored Apr 29, 2019 by Pablo Neira Ayuso

netfilter: nft_flow_offload: add entry to flowtable after confirmation



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: a3c90f7a ("netfilter: nf_tables: flow offload expression")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

parent 66293c46

net/netfilter/nft_flow_offload.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -94,8 +94,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
		if (help)
		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))

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