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netfilter: nf_tables: fix flowtable free

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Every flow_offload entry is added into the table twice. Because of this,
rhashtable_free_and_destroy can't be used, since it would call kfree for
each flow_offload object twice.

This patch cleans up the flowtable via nf_flow_table_iterate() to
schedule removal of entries by setting on the dying bit, then there is
an explicitly invocation of the garbage collector to release resources.

Based on patch from Felix Fietkau.

Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Pablo Neira Ayuso 2018-02-06 13:22:47 +01:00
commit b408c5b04f
6 changed files with 26 additions and 13 deletions
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1
net/ipv4/netfilter/nf_flow_table_ipv4.c
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@ -260,6 +260,7 @@ static struct nf_flowtable_type flowtable_ipv4 = {
.family = NFPROTO_IPV4,
.params = &nf_flow_offload_rhash_params,
.gc = nf_flow_offload_work_gc,
.free = nf_flow_table_free,
.hook = nf_flow_offload_ip_hook,
.owner = THIS_MODULE,
};