iptables

package
v0.0.0-...-8d193d8 Latest Latest
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 Go to latest Published: Sep 28, 2022 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Index

Constants

View Source 
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"
	// IPv4 is version 4
	IPv4 IPVersion = "IPV4"
	// IPv6 is version 6
	IPv6 IPVersion = "IPV6"
)

Variables

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

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

Functions

func AddInterfaceFirewalld 

func AddInterfaceFirewalld(intf string) error

AddInterfaceFirewalld adds the interface to the trusted zone

func DelInterfaceFirewalld 

func DelInterfaceFirewalld(intf string) error

DelInterfaceFirewalld removes the interface from the trusted zone

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 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

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
	IPTable     IPTable
}

ChainInfo defines the iptables chain.

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 (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 {
	Version IPVersion
}

IPTable defines struct with IPVersion

func GetIptable 

func GetIptable(version IPVersion) *IPTable

GetIptable returns an instance of IPTable with specified version

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) LoopbackByVersion 

func (iptable IPTable) LoopbackByVersion() string

LoopbackByVersion returns loopback address by version

func (IPTable) NewChain 

func (iptable IPTable) NewChain(name string, table Table, hairpinMode bool) (*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"
	// Ebtables point to bridge table
	Ebtables IPV = "eb"
)

type IPVersion 

type IPVersion string

IPVersion refers to IP version, v4 or v6

type Policy 

type Policy string

Policy is the default iptable policies

type Table 

type Table string

Table refers to Nat, Filter or Mangle.

type ZoneSettings 

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

ZoneSettings holds the firewalld zone settings, documented in https://firewalld.org/documentation/man-pages/firewalld.dbus.html

Source Files

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