nat

package
v0.0.0-...-c34bea4 Latest Latest
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 Go to latest Published: May 20, 2022 License: Apache-2.0 Imports: 11 Imported by: 0

Documentation

Overview

Package nat implements the BPF NAT map interaction code. +groupName=maps

Index

Constants

View Source 
const (
	// MapNameSnat4Global represents global IPv4 NAT table.
	MapNameSnat4Global = "cilium_snat_v4_external"
	// MapNameSnat6Global represents global IPv6 NAT table.
	MapNameSnat6Global = "cilium_snat_v6_external"

	// MinPortSnatDefault represents default min port from range.
	MinPortSnatDefault = 1024
	// MaxPortSnatDefault represents default max port from range.
	MaxPortSnatDefault = 65535
)
View Source 
const SizeofNatEntry4 = int(unsafe.Sizeof(NatEntry4{}))

SizeofNatEntry4 is the size of the NatEntry4 type in bytes.

View Source 
const SizeofNatEntry6 = int(unsafe.Sizeof(NatEntry6{}))

SizeofNatEntry6 is the size of the NatEntry6 type in bytes.

View Source 
const SizeofNatKey4 = int(unsafe.Sizeof(NatKey4{}))

SizeofNatKey4 is the size of the NatKey4 type in bytes.

View Source 
const SizeofNatKey6 = int(unsafe.Sizeof(NatKey6{}))

SizeofNatKey6 is the size of the NatKey6 type in bytes.

Variables

This section is empty.

Functions

func DoDumpEntries 

func DoDumpEntries(m NatMap) (string, error)

DoDumpEntries iterates through Map m and writes the values of the nat entries in m to a string.

func NatDumpCreated 

func NatDumpCreated(dumpStart, entryCreated uint64) string

NatDumpCreated returns time in seconds when NAT entry was created.

Types

type Map 

type Map struct {
	bpf.Map
	// contains filtered or unexported fields
}

Map represents a NAT map. It also implements the NatMap interface.

func GlobalMaps 

func GlobalMaps(ipv4, ipv6, nodeport bool) (ipv4Map, ipv6Map *Map)

GlobalMaps returns all global NAT maps.

func NewMap 

func NewMap(name string, v4 bool, entries int) *Map

NewMap instantiates a Map.

func (*Map) Delete 

func (m *Map) Delete(k bpf.MapKey) (deleted bool, err error)

func (*Map) DeleteMapping 

func (m *Map) DeleteMapping(key tuple.TupleKey) error

DeleteMapping removes a NAT mapping from the global NAT table.

func (*Map) DumpEntries 

func (m *Map) DumpEntries() (string, error)

DumpEntries iterates through Map m and writes the values of the nat entries in m to a string.

func (*Map) DumpReliablyWithCallback 

func (m *Map) DumpReliablyWithCallback(cb bpf.DumpCallback, stats *bpf.DumpStats) error

func (*Map) DumpStats 

func (m *Map) DumpStats() *bpf.DumpStats

func (*Map) Flush 

func (m *Map) Flush() int

Flush deletes all NAT mappings from the given table.

type NatEntry 

type NatEntry interface {
	bpf.MapValue

	// ToHost converts fields to host byte order.
	ToHost() NatEntry

	// Dumps the Nat entry as string.
	Dump(key NatKey, start uint64) string
}

NatEntry is the interface describing values to the NAT map.

type NatEntry4 

type NatEntry4 struct {
	Created   uint64     `align:"created"`
	HostLocal uint64     `align:"host_local"`
	Pad1      uint64     `align:"pad1"`
	Pad2      uint64     `align:"pad2"`
	Addr      types.IPv4 `align:"to_saddr"`
	Port      uint16     `align:"to_sport"`
}

NatEntry4 represents an IPv4 entry in the NAT table. +k8s:deepcopy-gen=true +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue

func (*NatEntry4) DeepCopy 

func (in *NatEntry4) DeepCopy() *NatEntry4

DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NatEntry4.

func (*NatEntry4) DeepCopyInto 

func (in *NatEntry4) DeepCopyInto(out *NatEntry4)

DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.

func (*NatEntry4) DeepCopyMapValue 

func (in *NatEntry4) DeepCopyMapValue() bpf.MapValue

DeepCopyMapValue is an autogenerated deepcopy function, copying the receiver, creating a new bpf.MapValue.

func (*NatEntry4) Dump 

func (n *NatEntry4) Dump(key NatKey, start uint64) string

Dump dumps NAT entry to string.

func (*NatEntry4) GetValuePtr 

func (n *NatEntry4) GetValuePtr() unsafe.Pointer

GetValuePtr returns the unsafe.Pointer for n.

func (*NatEntry4) String 

func (n *NatEntry4) String() string

String returns the readable format.

func (*NatEntry4) ToHost 

func (n *NatEntry4) ToHost() NatEntry

ToHost converts NatEntry4 ports to host byte order.

type NatEntry6 

type NatEntry6 struct {
	Created   uint64     `align:"created"`
	HostLocal uint64     `align:"host_local"`
	Pad1      uint64     `align:"pad1"`
	Pad2      uint64     `align:"pad2"`
	Addr      types.IPv6 `align:"to_saddr"`
	Port      uint16     `align:"to_sport"`
}

NatEntry6 represents an IPv6 entry in the NAT table. +k8s:deepcopy-gen=true +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue

func (*NatEntry6) DeepCopy 

func (in *NatEntry6) DeepCopy() *NatEntry6

DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NatEntry6.

func (*NatEntry6) DeepCopyInto 

func (in *NatEntry6) DeepCopyInto(out *NatEntry6)

DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.

func (*NatEntry6) DeepCopyMapValue 

func (in *NatEntry6) DeepCopyMapValue() bpf.MapValue

DeepCopyMapValue is an autogenerated deepcopy function, copying the receiver, creating a new bpf.MapValue.

func (*NatEntry6) Dump 

func (n *NatEntry6) Dump(key NatKey, start uint64) string

Dump dumps NAT entry to string.

func (*NatEntry6) GetValuePtr 

func (n *NatEntry6) GetValuePtr() unsafe.Pointer

GetValuePtr returns the unsafe.Pointer for n.

func (*NatEntry6) String 

func (n *NatEntry6) String() string

String returns the readable format.

func (*NatEntry6) ToHost 

func (n *NatEntry6) ToHost() NatEntry

ToHost converts NatEntry4 ports to host byte order.

type NatKey 

type NatKey interface {
	bpf.MapKey

	// ToNetwork converts fields to network byte order.
	ToNetwork() NatKey

	// ToHost converts fields to host byte order.
	ToHost() NatKey

	// Dump contents of key to sb. Returns true if successful.
	Dump(sb *strings.Builder, reverse bool) bool

	// GetFlags flags containing the direction of the TupleKey.
	GetFlags() uint8

	// GetNextHeader returns the proto of the NatKey
	GetNextHeader() u8proto.U8proto
}

type NatKey4 

type NatKey4 struct {
	tuple.TupleKey4Global
}

NatKey4 is needed to provide NatEntry type to Lookup values +k8s:deepcopy-gen=true +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey

func (*NatKey4) DeepCopy 

func (in *NatKey4) DeepCopy() *NatKey4

DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NatKey4.

func (*NatKey4) DeepCopyInto 

func (in *NatKey4) DeepCopyInto(out *NatKey4)

DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.

func (*NatKey4) DeepCopyMapKey 

func (in *NatKey4) DeepCopyMapKey() bpf.MapKey

DeepCopyMapKey is an autogenerated deepcopy function, copying the receiver, creating a new bpf.MapKey.

func (*NatKey4) GetKeyPtr 

func (k *NatKey4) GetKeyPtr() unsafe.Pointer

GetKeyPtr returns the unsafe.Pointer for k.

func (*NatKey4) GetNextHeader 

func (k *NatKey4) GetNextHeader() u8proto.U8proto

func (*NatKey4) NewValue 

func (k *NatKey4) NewValue() bpf.MapValue

NewValue creates a new bpf.MapValue.

func (*NatKey4) ToHost 

func (k *NatKey4) ToHost() NatKey

ToHost converts ports to host byte order.

This is necessary to prevent callers from implicitly converting the NatKey4 type here into a local key type in the nested TupleKey4Global field.

func (*NatKey4) ToNetwork 

func (k *NatKey4) ToNetwork() NatKey

ToNetwork converts ports to network byte order.

This is necessary to prevent callers from implicitly converting the NatKey4 type here into a local key type in the nested TupleKey4Global field.

type NatKey6 

type NatKey6 struct {
	tuple.TupleKey6Global
}

NatKey6 is needed to provide NatEntry type to Lookup values +k8s:deepcopy-gen=true +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey

func (*NatKey6) DeepCopy 

func (in *NatKey6) DeepCopy() *NatKey6

DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new NatKey6.

func (*NatKey6) DeepCopyInto 

func (in *NatKey6) DeepCopyInto(out *NatKey6)

DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.

func (*NatKey6) DeepCopyMapKey 

func (in *NatKey6) DeepCopyMapKey() bpf.MapKey

DeepCopyMapKey is an autogenerated deepcopy function, copying the receiver, creating a new bpf.MapKey.

func (*NatKey6) GetKeyPtr 

func (k *NatKey6) GetKeyPtr() unsafe.Pointer

GetKeyPtr returns the unsafe.Pointer for k.

func (*NatKey6) GetNextHeader 

func (k *NatKey6) GetNextHeader() u8proto.U8proto

func (*NatKey6) NewValue 

func (k *NatKey6) NewValue() bpf.MapValue

NewValue creates a new bpf.MapValue.

func (*NatKey6) ToHost 

func (k *NatKey6) ToHost() NatKey

ToHost converts ports to host byte order.

This is necessary to prevent callers from implicitly converting the NatKey6 type here into a local key type in the nested TupleKey6Global field.

func (*NatKey6) ToNetwork 

func (k *NatKey6) ToNetwork() NatKey

ToNetwork converts ports to network byte order.

This is necessary to prevent callers from implicitly converting the NatKey6 type here into a local key type in the nested TupleKey6Global field.

type NatMap 

type NatMap interface {
	Open() error
	Close() error
	Path() (string, error)
	DumpEntries() (string, error)
	DumpWithCallback(bpf.DumpCallback) error
}

NatMap interface represents a NAT map, and can be reused to implement mock maps for unit tests.

type NatMapRecord 

type NatMapRecord struct {
	Key   NatKey
	Value NatEntry
}

A "Record" designates a map entry (key + value), but avoid "entry" because of possible confusion with "NatEntry" (actually the value part). This type is used for JSON dump and mock maps.

Source Files

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