NF_BR_FORWARD
br_hook = NF_BR_FORWARD;
.hooknum = NF_BR_FORWARD,
br_nf_hook_thresh(NF_BR_FORWARD, net, sk, skb, in, skb->dev,
#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
[NF_BR_FORWARD] = &initial_chains[1],
.hooknum = NF_BR_FORWARD,
(1 << NF_BR_FORWARD) |
[NF_BR_FORWARD] = nft_do_chain_bridge,