EBT_ARP_OPCODE 16 include/uapi/linux/netfilter_bridge/ebt_arp.h #define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \ EBT_ARP_OPCODE 29 net/bridge/netfilter/ebt_arp.c if ((info->bitmask & EBT_ARP_OPCODE) && EBT_ARP_OPCODE 30 net/bridge/netfilter/ebt_arp.c NF_INVF(info, EBT_ARP_OPCODE, info->opcode != ah->ar_op))