type Chain string

const (
	ChainPostrouting Chain = "POSTROUTING"
	ChainPrerouting  Chain = "PREROUTING"
	ChainOutput      Chain = "OUTPUT"
	ChainInput       Chain = "INPUT"
	ChainBrouting    Chain = "BROUTING"
)

type Interface interface {
	// GetVersion returns the "X.Y.Z" semver string for ebtables.
	GetVersion() (string, error)
	// EnsureRule checks if the specified rule is present and, if not, creates it.  If the rule existed, return true.
	// WARNING: ebtables does not provide check operation like iptables do. Hence we have to do a string match of args.
	// Input args must follow the format and sequence of ebtables list output. Otherwise, EnsureRule will always create
	// new rules and causing duplicates.
	EnsureRule(position RulePosition, table Table, chain Chain, args ...string) (bool, error)
	// DeleteRule checks if the specified rule is present and, if so, deletes it.
	DeleteRule(table Table, chain Chain, args ...string) error
	// EnsureChain checks if the specified chain is present and, if not, creates it.  If the rule existed, return true.
	EnsureChain(table Table, chain Chain) (bool, error)
	// DeleteChain deletes the specified chain.  If the chain did not exist, return error.
	DeleteChain(table Table, chain Chain) error
	// FlushChain flush the specified chain.  If the chain did not exist, return error.
	FlushChain(table Table, chain Chain) error
}

type RulePosition string

const (
	Prepend RulePosition = "-I"
	Append  RulePosition = "-A"
)

type Table string

const (
	TableNAT    Table = "nat"
	TableFilter Table = "filter"
	TableBroute Table = "broute"
)