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portmap.go
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portmap.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package policy
import (
"errors"
"fmt"
"strings"
"github.com/cilium/cilium/pkg/iana"
"github.com/cilium/cilium/pkg/lock"
"github.com/cilium/cilium/pkg/u8proto"
)
var (
ErrNilMap = errors.New("nil map")
ErrUnknownNamedPort = errors.New("unknown named port")
ErrIncompatibleProtocol = errors.New("incompatible protocol")
ErrNamedPortIsZero = errors.New("named port is zero")
ErrDuplicateNamedPorts = errors.New("duplicate named ports")
)
// PortProto is a pair of port number and protocol and is used as the
// value type in named port maps.
type PortProto struct {
Port uint16 // non-0
Proto uint8 // 0 for any
}
// NamedPortMap maps port names to port numbers and protocols.
type NamedPortMap map[string]PortProto
// PortProtoSet is a reference-counted set of unique PortProto values.
type PortProtoSet map[PortProto]int
// Equal returns true if the PortProtoSets are equal.
func (pps PortProtoSet) Equal(other PortProtoSet) bool {
if len(pps) != len(other) {
return false
}
for port := range pps {
if _, exists := other[port]; !exists {
return false
}
}
return true
}
// Add increments the reference count for the specified key.
func (pps PortProtoSet) Add(pp PortProto) bool {
value, exists := pps[pp]
pps[pp] = value + 1
return !exists
}
// Delete decrements the reference count for the specified key.
func (pps PortProtoSet) Delete(pp PortProto) bool {
value := pps[pp]
if value <= 1 {
delete(pps, pp)
return true
}
pps[pp] = value - 1
return false
}
// NamedPortMultiMap may have multiple entries for a name if multiple PODs
// define the same name with different values.
type NamedPortMultiMap interface {
// GetNamedPort returns the port number for the named port, if any.
GetNamedPort(name string, proto uint8) (uint16, error)
// Len returns the number of Name->PortProtoSet mappings known.
Len() int
}
func NewNamedPortMultiMap() *namedPortMultiMap {
return &namedPortMultiMap{
m: make(map[string]PortProtoSet),
}
}
// Implements NamedPortMultiMap and allows changes through Update. All accesses
// must be protected by its RW mutex.
type namedPortMultiMap struct {
lock.RWMutex
m map[string]PortProtoSet
}
func (npm *namedPortMultiMap) Len() int {
npm.RLock()
defer npm.RUnlock()
return len(npm.m)
}
// Update applies potential changes in named ports, and returns whether there were any.
func (npm *namedPortMultiMap) Update(old, new NamedPortMap) (namedPortsChanged bool) {
npm.Lock()
defer npm.Unlock()
// The order is important here. Increment the refcount first, and then
// decrement it again for old ports, so that we don't hit zero if there are
// no changes.
for name, port := range new {
c, ok := npm.m[name]
if !ok {
c = make(PortProtoSet)
npm.m[name] = c
}
if c.Add(port) {
namedPortsChanged = true
}
}
for name, port := range old {
if npm.m[name].Delete(port) {
namedPortsChanged = true
if len(npm.m[name]) == 0 {
delete(npm.m, name)
}
}
}
return namedPortsChanged
}
// ValidatePortName checks that the port name conforms to the IANA Service Names spec
// and converts the port name to lower case for case-insensitive comparisons.
func ValidatePortName(name string) (string, error) {
if !iana.IsSvcName(name) { // Port names are formatted as IANA Service Names
return "", fmt.Errorf("Invalid port name \"%s\", not using as a named port", name)
}
return strings.ToLower(name), nil // Normalize for case-insensitive comparison
}
func newPortProto(port int, protocol string) (pp PortProto, err error) {
var u8p u8proto.U8proto
if protocol == "" {
u8p = u8proto.TCP // K8s ContainerPort protocol defaults to TCP
} else {
var err error
u8p, err = u8proto.ParseProtocol(protocol)
if err != nil {
return pp, err
}
}
if port < 1 || port > 65535 {
if port == 0 {
return pp, ErrNamedPortIsZero
}
return pp, fmt.Errorf("Port number %d out of 16-bit range", port)
}
return PortProto{
Proto: uint8(u8p),
Port: uint16(port),
}, nil
}
// AddPort adds a new PortProto to the NamedPortMap
func (npm NamedPortMap) AddPort(name string, port int, protocol string) error {
name, err := ValidatePortName(name)
if err != nil {
return err
}
pp, err := newPortProto(port, protocol)
if err != nil {
return err
}
npm[name] = pp
return nil
}
// GetNamedPort returns the port number for the named port, if any.
func (npm NamedPortMap) GetNamedPort(name string, proto uint8) (uint16, error) {
if npm == nil {
return 0, ErrNilMap
}
pp, ok := npm[name]
if !ok {
return 0, ErrUnknownNamedPort
}
if pp.Proto != 0 && proto != pp.Proto {
return 0, ErrIncompatibleProtocol
}
if pp.Port == 0 {
return 0, ErrNamedPortIsZero
}
return pp.Port, nil
}
// GetNamedPort returns the port number for the named port, if any.
func (npm *namedPortMultiMap) GetNamedPort(name string, proto uint8) (uint16, error) {
if npm == nil {
return 0, ErrNilMap
}
npm.RLock()
defer npm.RUnlock()
if npm.m == nil {
return 0, ErrNilMap
}
pps, ok := npm.m[name]
if !ok {
// Return an error the caller can filter out as this happens only for egress policy
// and it is likely the destination POD with the port name is simply not scheduled yet.
return 0, ErrUnknownNamedPort
}
// Find if there is a single port that has no proto conflict and no zero port value
port := uint16(0)
err := ErrUnknownNamedPort
for pp := range pps {
if pp.Proto != 0 && proto != pp.Proto {
err = ErrIncompatibleProtocol
continue // conflicting proto
}
if pp.Port == 0 {
err = ErrNamedPortIsZero
continue // zero port
}
if port != 0 && pp.Port != port {
return 0, ErrDuplicateNamedPorts
}
port = pp.Port
}
if port == 0 {
return 0, err
}
return port, nil
}