sockmap

Documentation

Overview

Package Sockmap represents the map from 5-tuple to the socket. It is primarily managed from the datapath using a sockops program. Cilium side is primarily for pretty printing.

Index

• Constants
• Variables
• func SockmapCreate()
• type SockmapKey
  • func NewSockmapKey(dip, sip net.IP, sport, dport uint32) SockmapKey
  • func (k *SockmapKey) GetKeyPtr() unsafe.Pointer
  • func (k SockmapKey) NewValue() bpf.MapValue
  • func (v SockmapKey) String() string
• type SockmapValue
  • func (v *SockmapValue) GetValuePtr() unsafe.Pointer
  • func (v SockmapValue) String() string

Constants

const (

	// MaxEntries represents the maximum number of endpoints in the map
	MaxEntries = 65535
)

Variables

var (
	// SockMap represents the BPF map for sockets
	SockMap = bpf.NewMap(mapName,
		bpf.MapTypeSockHash,
		int(unsafe.Sizeof(SockmapKey{})),
		4,
		MaxEntries,
		0, 0,
		func(key []byte, value []byte) (bpf.MapKey, bpf.MapValue, error) {
			k, v := &SockmapKey{}, &SockmapValue{}

			if err := bpf.ConvertKeyValue(key, value, k, v); err != nil {
				return nil, nil, err
			}

			return k, v, nil
		},
	)
)

Functions

func SockmapCreate

func SockmapCreate()

SockmapCreate will create sockmap map

Types

type SockmapKey

type SockmapKey struct {
	DIP    types.IPv6 `align:"$union0"`
	SIP    types.IPv6 `align:"$union1"`
	Family uint8      `align:"family"`
	Pad7   uint8      `align:"pad7"`
	Pad8   uint16     `align:"pad8"`
	SPort  uint32     `align:"sport"`
	DPort  uint32     `align:"dport"`
}

SockmapKey is the 5-tuple used to lookup a socket

func NewSockmapKey

func NewSockmapKey(dip, sip net.IP, sport, dport uint32) SockmapKey

NewSockmapKey returns a new key using 5-tuple input.

func (*SockmapKey) GetKeyPtr

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

GetKeyPtr returns the unsafe pointer to the BPF key

func (SockmapKey) NewValue

func (k SockmapKey) NewValue() bpf.MapValue

NewValue returns a new empty instance of the structure representing the BPF map value

func (SockmapKey) String

func (v SockmapKey) String() string

String pretty print the 5-tuple as sip:sport->dip:dport

type SockmapValue

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

SockmapValue is the fd of a socket

func (*SockmapValue) GetValuePtr

func (v *SockmapValue) GetValuePtr() unsafe.Pointer

GetValuePtr returns the unsafe pointer to the BPF value.

func (SockmapValue) String

func (v SockmapValue) String() string

String pretty print the file descriptor value, note this is local to agent.