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x_tables matches and targets that require nf_conntrack_ipv[4|6] to work don't have enough information to load on demand these modules. This patch introduces the following changes to solve this issue: o nf_ct_l3proto_try_module_get: try to load the layer 3 connection tracker module and increases the refcount. o nf_ct_l3proto_module put: drop the refcount of the module. Signed-off-by: Pablo Neira Ayuso <[email protected]> Signed-off-by: Patrick McHardy <[email protected]> Signed-off-by: David S. Miller <[email protected]>