From 9ed81c8e0deb7bd2aa0d69371e4a0f9a7b31205d Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 11 May 2020 11:54:31 +0200 Subject: netfilter: flowtable: set NF_FLOW_TEARDOWN flag on entry expiration If the flow timer expires, the gc sets on the NF_FLOW_TEARDOWN flag. Otherwise, the flowtable software path might race to refresh the timeout, leaving the state machine in inconsistent state. Fixes: c29f74e0df7a ("netfilter: nf_flow_table: hardware offload support") Reported-by: Paul Blakey Reviewed-by: Roi Dayan Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_flow_table_core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'net') diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c index 4344e572b7f9..42da6e337276 100644 --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -284,7 +284,7 @@ static void flow_offload_del(struct nf_flowtable *flow_table, if (nf_flow_has_expired(flow)) flow_offload_fixup_ct(flow->ct); - else if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) + else flow_offload_fixup_ct_timeout(flow->ct); flow_offload_free(flow); @@ -361,8 +361,10 @@ static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data) { struct nf_flowtable *flow_table = data; - if (nf_flow_has_expired(flow) || nf_ct_is_dying(flow->ct) || - test_bit(NF_FLOW_TEARDOWN, &flow->flags)) { + if (nf_flow_has_expired(flow) || nf_ct_is_dying(flow->ct)) + set_bit(NF_FLOW_TEARDOWN, &flow->flags); + + if (test_bit(NF_FLOW_TEARDOWN, &flow->flags)) { if (test_bit(NF_FLOW_HW, &flow->flags)) { if (!test_bit(NF_FLOW_HW_DYING, &flow->flags)) nf_flow_offload_del(flow_table, flow); -- cgit v1.2.3