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netfilter: flowtable: allow unidirectional rules

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Modify flow table offload to support unidirectional connections by
extending enum nf_flow_flags with new "NF_FLOW_HW_BIDIRECTIONAL" flag. Only
offload reply direction when the flag is set. This infrastructure change is
necessary to support offloading UDP NEW connections in original direction
in following patches in series.

Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2023-02-01 17:30:56 +01:00 committed by David S. Miller
parent 0eb5acb164
commit 8f84780b84
2 changed files with 9 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
include/net/netfilter/nf_flow_table.h
View file

@ -164,6 +164,7 @@ enum nf_flow_flags {
NF_FLOW_HW_DYING,
NF_FLOW_HW_DEAD,
NF_FLOW_HW_PENDING,
NF_FLOW_HW_BIDIRECTIONAL,
};
enum flow_offload_type {

6
net/netfilter/nf_flow_table_offload.c
View file

@ -895,6 +895,7 @@ static int flow_offload_rule_add(struct flow_offload_work *offload,
ok_count += flow_offload_tuple_add(offload, flow_rule[0],
FLOW_OFFLOAD_DIR_ORIGINAL);
if (test_bit(NF_FLOW_HW_BIDIRECTIONAL, &offload->flow->flags))
ok_count += flow_offload_tuple_add(offload, flow_rule[1],
FLOW_OFFLOAD_DIR_REPLY);
if (ok_count == 0)
@ -926,6 +927,7 @@ static void flow_offload_work_del(struct flow_offload_work *offload)
{
clear_bit(IPS_HW_OFFLOAD_BIT, &offload->flow->ct->status);
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_ORIGINAL);
if (test_bit(NF_FLOW_HW_BIDIRECTIONAL, &offload->flow->flags))
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_REPLY);
set_bit(NF_FLOW_HW_DEAD, &offload->flow->flags);
}
@ -946,7 +948,9 @@ static void flow_offload_work_stats(struct flow_offload_work *offload)
u64 lastused;
flow_offload_tuple_stats(offload, FLOW_OFFLOAD_DIR_ORIGINAL, &stats[0]);
flow_offload_tuple_stats(offload, FLOW_OFFLOAD_DIR_REPLY, &stats[1]);
if (test_bit(NF_FLOW_HW_BIDIRECTIONAL, &offload->flow->flags))
flow_offload_tuple_stats(offload, FLOW_OFFLOAD_DIR_REPLY,
&stats[1]);
lastused = max_t(u64, stats[0].lastused, stats[1].lastused);
offload->flow->timeout = max_t(u64, offload->flow->timeout,