NF_ARP_IN 961 net/ipv4/arp.c return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, NF_ARP_IN 18 net/ipv4/netfilter/arptable_filter.c #define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \ NF_ARP_IN 75 net/netfilter/nft_chain_filter.c .hook_mask = (1 << NF_ARP_IN) | NF_ARP_IN 78 net/netfilter/nft_chain_filter.c [NF_ARP_IN] = nft_do_chain_arp,