iptables

Documentation

Index

• Constants
• Variables
• func AddReturnRule(chain string) error
• func DeleteConntrackEntries(nlh *netlink.Handle, ipv4List []net.IP, ipv6List []net.IP) (uint, uint, error)
• func EnsureJumpRule(fromChain, toChain string) error
• func ExistChain(chain string, table Table) bool
• func Exists(table Table, chain string, rule ...string) bool
• func ExistsNative(table Table, chain string, rule ...string) bool
• func FirewalldInit() error
• func GetVersion() (major, minor, micro int, err error)
• func IsConntrackProgrammable(nlh *netlink.Handle) bool
• func OnReloaded(callback func())
• func Passthrough(ipv IPV, args ...string) ([]byte, error)
• func ProgramChain(c *ChainInfo, bridgeName string, hairpinMode, enable bool) error
• func ProgramRule(table Table, chain string, action Action, args []string) error
• func Raw(args ...string) ([]byte, error)
• func RawCombinedOutput(args ...string) error
• func RawCombinedOutputNative(args ...string) error
• func RemoveExistingChain(name string, table Table) error
• func SetDefaultPolicy(table Table, chain string, policy Policy) error
• type Action
• type ChainError
  • func (e ChainError) Error() string
• type ChainInfo
  • func NewChain(name string, table Table, hairpinMode bool) (*ChainInfo, error)
  • func (c *ChainInfo) Forward(action Action, ip net.IP, port int, proto, destAddr string, destPort int, ...) error
  • func (c *ChainInfo) Link(action Action, ip1, ip2 net.IP, port int, proto string, bridgeName string) error
  • func (c *ChainInfo) Output(action Action, args ...string) error
  • func (c *ChainInfo) Prerouting(action Action, args ...string) error
  • func (c *ChainInfo) Remove() error
• type Conn
• type IPV
• type Policy
• type Table

Constants

const (
	// Append appends the rule at the end of the chain.
	Append Action = "-A"
	// Delete deletes the rule from the chain.
	Delete Action = "-D"
	// Insert inserts the rule at the top of the chain.
	Insert Action = "-I"
	// Nat table is used for nat translation rules.
	Nat Table = "nat"
	// Filter table is used for filter rules.
	Filter Table = "filter"
	// Mangle table is used for mangling the packet.
	Mangle Table = "mangle"
	// Drop is the default iptables DROP policy
	Drop Policy = "DROP"
	// Accept is the default iptables ACCEPT policy
	Accept Policy = "ACCEPT"
)

Variables

var (
	// ErrConntrackNotConfigurable means that conntrack module is not loaded or does not have the netlink module loaded
	ErrConntrackNotConfigurable = errors.New("conntrack is not available")
)

var (

	// ErrIptablesNotFound is returned when the rule is not found.
	ErrIptablesNotFound = errors.New("Iptables not found")
)

Functions

func AddReturnRule

func AddReturnRule(chain string) error

AddReturnRule adds a return rule for the chain in the filter table

func DeleteConntrackEntries

func DeleteConntrackEntries(nlh *netlink.Handle, ipv4List []net.IP, ipv6List []net.IP) (uint, uint, error)

DeleteConntrackEntries deletes all the conntrack connections on the host for the specified IP Returns the number of flows deleted for IPv4, IPv6 else error

func EnsureJumpRule

func EnsureJumpRule(fromChain, toChain string) error

EnsureJumpRule ensures the jump rule is on top

func ExistChain

func ExistChain(chain string, table Table) bool

ExistChain checks if a chain exists

func Exists

func Exists(table Table, chain string, rule ...string) bool

Exists checks if a rule exists

func ExistsNative

func ExistsNative(table Table, chain string, rule ...string) bool

ExistsNative behaves as Exists with the difference it will always invoke `iptables` binary.

func FirewalldInit

func FirewalldInit() error

FirewalldInit initializes firewalld management code.

func GetVersion

func GetVersion() (major, minor, micro int, err error)

GetVersion reads the iptables version numbers during initialization

func IsConntrackProgrammable

func IsConntrackProgrammable(nlh *netlink.Handle) bool

IsConntrackProgrammable returns true if the handle supports the NETLINK_NETFILTER and the base modules are loaded

func OnReloaded

func OnReloaded(callback func())

OnReloaded add callback

func Passthrough

func Passthrough(ipv IPV, args ...string) ([]byte, error)

Passthrough method simply passes args through to iptables/ip6tables

func ProgramChain

func ProgramChain(c *ChainInfo, bridgeName string, hairpinMode, enable bool) error

ProgramChain is used to add rules to a chain

func ProgramRule

func ProgramRule(table Table, chain string, action Action, args []string) error

ProgramRule adds the rule specified by args only if the rule is not already present in the chain. Reciprocally, it removes the rule only if present.

func Raw

func Raw(args ...string) ([]byte, error)

Raw calls 'iptables' system command, passing supplied arguments.

func RawCombinedOutput

func RawCombinedOutput(args ...string) error

RawCombinedOutput internally calls the Raw function and returns a non nil error if Raw returned a non nil error or a non empty output

func RawCombinedOutputNative

func RawCombinedOutputNative(args ...string) error

RawCombinedOutputNative behave as RawCombinedOutput with the difference it will always invoke `iptables` binary

func RemoveExistingChain

func RemoveExistingChain(name string, table Table) error

RemoveExistingChain removes existing chain from the table.

func SetDefaultPolicy

func SetDefaultPolicy(table Table, chain string, policy Policy) error

SetDefaultPolicy sets the passed default policy for the table/chain

Types

type Action

type Action string

Action signifies the iptable action.

type ChainError

type ChainError struct {
	Chain  string
	Output []byte
}

ChainError is returned to represent errors during ip table operation.

func (ChainError) Error

func (e ChainError) Error() string

type ChainInfo

type ChainInfo struct {
	Name        string
	Table       Table
	HairpinMode bool
}

ChainInfo defines the iptables chain.

func NewChain

func NewChain(name string, table Table, hairpinMode bool) (*ChainInfo, error)

NewChain adds a new chain to ip table.

func (*ChainInfo) Forward

func (c *ChainInfo) Forward(action Action, ip net.IP, port int, proto, destAddr string, destPort int, bridgeName string) error

Forward adds forwarding rule to 'filter' table and corresponding nat rule to 'nat' table.

func (*ChainInfo) Link

func (c *ChainInfo) Link(action Action, ip1, ip2 net.IP, port int, proto string, bridgeName string) error

Link adds reciprocal ACCEPT rule for two supplied IP addresses. Traffic is allowed from ip1 to ip2 and vice-versa

func (*ChainInfo) Output

func (c *ChainInfo) Output(action Action, args ...string) error

Output adds linking rule to an OUTPUT chain.

func (*ChainInfo) Prerouting

func (c *ChainInfo) Prerouting(action Action, args ...string) error

Prerouting adds linking rule to nat/PREROUTING chain.

func (*ChainInfo) Remove

func (c *ChainInfo) Remove() error

Remove removes the chain.

type Conn

type Conn struct {
	// contains filtered or unexported fields
}

Conn is a connection to firewalld dbus endpoint.

type IPV

type IPV string

IPV defines the table string

const (
	// Iptables point ipv4 table
	Iptables IPV = "ipv4"
	// IP6Tables point to ipv6 table
	IP6Tables IPV = "ipv6"
	// Ebtables point to bridge table
	Ebtables IPV = "eb"
)

type Policy

type Policy string

Policy is the default iptable policies

type Table

type Table string

Table refers to Nat, Filter or Mangle.