iptables

Documentation

Index

• func AddInterfaceFirewalld(intf string) error
• func DelInterfaceFirewalld(intf string) error
• func DeleteConntrackEntries(nlh *netlink.Handle, ipv4List []net.IP, ipv6List []net.IP) error
• func DeleteConntrackEntriesByPort(nlh *netlink.Handle, proto types.Protocol, ports []uint16) error
• func OnReloaded(callback func())
• func Passthrough(ipv IPV, args ...string) ([]byte, error)
• type Action
• type ChainError
  • func (e ChainError) Error() string
• type ChainInfo
  • 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 IPTable
  • func GetIptable(version IPVersion) *IPTable
  • func (iptable IPTable) AddReturnRule(chain string) error
  • func (iptable IPTable) EnsureJumpRule(fromChain, toChain string) error
  • func (iptable IPTable) ExistChain(chain string, table Table) bool
  • func (iptable IPTable) Exists(table Table, chain string, rule ...string) bool
  • func (iptable IPTable) ExistsNative(table Table, chain string, rule ...string) bool
  • func (iptable IPTable) NewChain(name string, table Table) (*ChainInfo, error)
  • func (iptable IPTable) ProgramChain(c *ChainInfo, bridgeName string, hairpinMode, enable bool) error
  • func (iptable IPTable) ProgramRule(table Table, chain string, action Action, args []string) error
  • func (iptable IPTable) Raw(args ...string) ([]byte, error)
  • func (iptable IPTable) RawCombinedOutput(args ...string) error
  • func (iptable IPTable) RawCombinedOutputNative(args ...string) error
  • func (iptable IPTable) RemoveExistingChain(name string, table Table) error
  • func (iptable IPTable) SetDefaultPolicy(table Table, chain string, policy Policy) error
• type IPV
• type IPVersion
• type Policy
• type Table

Functions

func AddInterfaceFirewalld

func AddInterfaceFirewalld(intf string) error

AddInterfaceFirewalld adds the interface to the trusted zone. It is a no-op if firewalld is not running.

func DelInterfaceFirewalld

func DelInterfaceFirewalld(intf string) error

DelInterfaceFirewalld removes the interface from the trusted zone It is a no-op if firewalld is not running.

func DeleteConntrackEntries

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

func DeleteConntrackEntriesByPort(nlh *netlink.Handle, proto types.Protocol, ports []uint16) error

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

Types

type Action

type Action string

Action signifies the iptable action.

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"
)

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
	IPVersion IPVersion
}

ChainInfo defines the iptables chain.

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 IPTable

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

IPTable defines struct with IPVersion.

func GetIptable

func GetIptable(version IPVersion) *IPTable

GetIptable returns an instance of IPTable with specified version (IPv4 or IPv6). It panics if an invalid IPVersion is provided.

func (IPTable) AddReturnRule

func (iptable IPTable) AddReturnRule(chain string) error

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

func (IPTable) EnsureJumpRule

func (iptable IPTable) EnsureJumpRule(fromChain, toChain string) error

EnsureJumpRule ensures the jump rule is on top

func (IPTable) ExistChain

func (iptable IPTable) ExistChain(chain string, table Table) bool

ExistChain checks if a chain exists

func (IPTable) Exists

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

Exists checks if a rule exists

func (IPTable) ExistsNative

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

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

func (IPTable) NewChain

func (iptable IPTable) NewChain(name string, table Table) (*ChainInfo, error)

NewChain adds a new chain to ip table.

func (IPTable) ProgramChain

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

ProgramChain is used to add rules to a chain

func (IPTable) ProgramRule

func (iptable IPTable) 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 (IPTable) Raw

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

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

func (IPTable) RawCombinedOutput

func (iptable IPTable) 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 (IPTable) RawCombinedOutputNative

func (iptable IPTable) RawCombinedOutputNative(args ...string) error

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

func (IPTable) RemoveExistingChain

func (iptable IPTable) RemoveExistingChain(name string, table Table) error

RemoveExistingChain removes existing chain from the table.

func (IPTable) SetDefaultPolicy

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

SetDefaultPolicy sets the passed default policy for the table/chain

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"
)

type IPVersion

type IPVersion string

IPVersion refers to IP version, v4 or v6

const (
	// IPv4 is version 4.
	IPv4 IPVersion = "IPV4"
	// IPv6 is version 6.
	IPv6 IPVersion = "IPV6"
)

type Policy

type Policy string

Policy is the default iptable policies

const (
	// Drop is the default iptables DROP policy.
	Drop Policy = "DROP"
	// Accept is the default iptables ACCEPT policy.
	Accept Policy = "ACCEPT"
)

type Table

type Table string

Table refers to Nat, Filter or Mangle.

const (
	// 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"
)