policymap

package
v1.14.0-rc.0 Latest Latest
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 Go to latest Published: Jun 28, 2023 License: Apache-2.0 Imports: 9 Imported by: 88

Documentation

Overview

+groupName=maps

Index

Constants

View Source 
const (
	// PolicyCallMapName is the name of the map to do tail calls into policy
	// enforcement programs.
	PolicyCallMapName = "cilium_call_policy"

	// PolicyEgressCallMapName is the name of the map to do tail calls into egress policy
	// enforcement programs.
	PolicyEgressCallMapName = "cilium_egresscall_policy"

	// MapName is the prefix for endpoint-specific policy maps which map
	// identity+ports+direction to whether the policy allows communication
	// with that identity on that port for that direction.
	MapName = "cilium_policy_"

	// PolicyCallMaxEntries is the upper limit of entries in the program
	// array for the tail calls to jump into the endpoint specific policy
	// programs. This number *MUST* be identical to the maximum endpoint ID.
	PolicyCallMaxEntries = ^uint16(0)

	// AllPorts is used to ignore the L4 ports in PolicyMap lookups; all ports
	// are allowed. In the datapath, this is represented with the value 0 in the
	// port field of map elements.
	AllPorts = uint16(0)

	// PressureMetricThreshold sets the threshold over which map pressure will
	// be reported for the policy map.
	PressureMetricThreshold = 0.1
)
View Source 
const (
	NexthdrBits    = uint32(sizeofNexthdr) * 8
	DestPortBits   = uint32(sizeofDestPort) * 8
	FullPrefixBits = NexthdrBits + DestPortBits

	StaticPrefixBits = uint32(sizeofPolicyKey-sizeofPrefixlen)*8 - FullPrefixBits
)

Variables

View Source 
var (
	// MaxEntries is the upper limit of entries in the per endpoint policy
	// table ie the maximum number of peer identities that the endpoint could
	// send/receive traffic to/from.. It is set by InitMapInfo(), but unit
	// tests use the initial value below.
	// The default value of this upper limit is 16384.
	MaxEntries = 16384
)

Functions

func CallString added in v0.15.7 

func CallString(id uint16) string

CallString returns the string which indicates the calls map by index in the ELF, and index into that call map for a specific endpoint.

Derived from __section_tail(CILIUM_MAP_POLICY, NAME) per bpf/lib/tailcall.h.

func Create added in v0.15.7 

func Create(path string) error

Create creates a policy map at the specified path.

func EgressCallString added in v0.15.7 

func EgressCallString(id uint16) string

EgressCallString returns the string which indicates the calls map by index in the ELF, and index into that call map for a specific endpoint.

Derived from __section_tail(CILIUM_MAP_EGRESSPOLICY, NAME) per bpf/lib/tailcall.h.

func InitCallMaps added in v0.15.7 

func InitCallMaps(haveEgressCallMap bool) error

InitCallMap creates the policy call maps in the kernel.

func InitMapInfo added in v0.15.7 

func InitMapInfo(maxEntries int)

InitMapInfo updates the map info defaults for policy maps.

func RemoveGlobalMapping added in v0.15.7 

func RemoveGlobalMapping(id uint32, haveEgressCallMap bool) error

RemoveGlobalMapping removes the mapping from the specified endpoint ID to the BPF policy program for that endpoint.

Types

type CallKey added in v0.15.7 

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

CallKey is the index into the prog array map.

func (*CallKey) New added in v0.15.7 

func (k *CallKey) New() bpf.MapKey

func (*CallKey) String added in v0.15.7 

func (k *CallKey) String() string

String converts the key into a human readable string format.

type CallValue added in v0.15.7 

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

CallValue is the program ID in the prog array map.

func (*CallValue) New added in v0.15.7 

func (v *CallValue) New() bpf.MapValue

func (*CallValue) String added in v0.15.7 

func (v *CallValue) String() string

String converts the value into a human readable string format.

type PlumbingKey added in v0.15.7 

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

func (*PlumbingKey) New added in v0.15.7 

func (k *PlumbingKey) New() bpf.MapKey

func (*PlumbingKey) String added in v0.15.7 

func (k *PlumbingKey) String() string

type PlumbingValue added in v0.15.7 

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

func (*PlumbingValue) New added in v0.15.7 

func (k *PlumbingValue) New() bpf.MapValue

func (*PlumbingValue) String added in v0.15.7 

func (v *PlumbingValue) String() string

type PolicyEntriesDump added in v0.15.7 

type PolicyEntriesDump []PolicyEntryDump

PolicyEntriesDump is a wrapper for a slice of PolicyEntryDump

func (PolicyEntriesDump) Less added in v0.15.7 

func (p PolicyEntriesDump) Less(i, j int) bool

Less is a function used to sort PolicyEntriesDump by Policy Type (Deny / Allow), TrafficDirection (Ingress / Egress) and Identity (ascending order).

func (PolicyEntriesDump) String added in v0.15.7 

func (p PolicyEntriesDump) String() string

String returns a string representation of PolicyEntriesDump

type PolicyEntry 

type PolicyEntry struct {
	ProxyPortNetwork uint16           `align:"proxy_port"` // In network byte-order
	Flags            policyEntryFlags `align:"deny"`
	AuthType         uint8            `align:"auth_type"`
	Pad1             uint16           `align:"pad1"`
	Pad2             uint16           `align:"pad2"`
	Packets          uint64           `align:"packets"`
	Bytes            uint64           `align:"bytes"`
}

PolicyEntry represents an entry in the BPF policy map for an endpoint. It must match the layout of policy_entry in bpf/lib/common.h.

func (*PolicyEntry) Add 

func (pe *PolicyEntry) Add(oPe PolicyEntry)

func (*PolicyEntry) GetProxyPort added in v0.15.7 

func (pe *PolicyEntry) GetProxyPort() uint16

GetProxyPort returns the ProxyPortNetwork in host byte order

func (PolicyEntry) IsDeny added in v0.15.7 

func (pe PolicyEntry) IsDeny() bool

func (*PolicyEntry) New added in v0.15.7 

func (pe *PolicyEntry) New() bpf.MapValue

func (*PolicyEntry) String 

func (pe *PolicyEntry) String() string

type PolicyEntryDump 

type PolicyEntryDump struct {
	PolicyEntry
	Key PolicyKey
}

type PolicyKey added in v0.15.7 

type PolicyKey struct {
	Prefixlen        uint32 `align:"lpm_key"`
	Identity         uint32 `align:"sec_label"`
	TrafficDirection uint8  `align:"egress"`
	Nexthdr          uint8  `align:"protocol"`
	DestPortNetwork  uint16 `align:"dport"` // In network byte-order
}

PolicyKey represents a key in the BPF policy map for an endpoint. It must match the layout of policy_key in bpf/lib/common.h.

func NewKey added in v0.15.7 

func NewKey(id uint32, dport uint16, proto uint8, trafficDirection uint8) PolicyKey

NewKey returns a PolicyKey representing the specified parameters in network byte-order.

func (*PolicyKey) GetDestPort added in v0.15.7 

func (k *PolicyKey) GetDestPort() uint16

GetDestPort returns the DestPortNetwork in host byte order

func (*PolicyKey) New added in v0.15.7 

func (key *PolicyKey) New() bpf.MapKey

func (*PolicyKey) PortProtoString added in v0.15.7 

func (key *PolicyKey) PortProtoString() string

func (*PolicyKey) String added in v0.15.7 

func (key *PolicyKey) String() string

type PolicyMap 

type PolicyMap struct {
	*bpf.Map
}

func Open added in v0.15.7 

func Open(path string) (*PolicyMap, error)

Open opens the policymap at the specified path.

func OpenOrCreate added in v0.15.7 

func OpenOrCreate(path string) (*PolicyMap, error)

OpenOrCreate opens (or creates) a policy map at the specified path, which is used to govern which peer identities can communicate with the endpoint protected by this map.

func (*PolicyMap) Allow added in v0.15.7 

func (pm *PolicyMap) Allow(id uint32, dport uint16, proto u8proto.U8proto, trafficDirection trafficdirection.TrafficDirection, authType uint8, proxyPort uint16) error

Allow pushes an entry into the PolicyMap to allow traffic in the given `trafficDirection` for identity `id` with destination port `dport` over protocol `proto`. It is assumed that `dport` and `proxyPort` are in host byte-order.

func (*PolicyMap) AllowKey added in v0.15.7 

func (pm *PolicyMap) AllowKey(key PolicyKey, authType uint8, proxyPort uint16) error

AllowKey pushes an entry into the PolicyMap for the given PolicyKey k. Returns an error if the update of the PolicyMap fails.

func (*PolicyMap) Delete added in v0.15.7 

func (pm *PolicyMap) Delete(id uint32, dport uint16, proto u8proto.U8proto, trafficDirection trafficdirection.TrafficDirection) error

Delete removes an entry from the PolicyMap for identity `id` sending traffic in direction `trafficDirection` with destination port `dport` over protocol `proto`. It is assumed that `dport` is in host byte-order. Returns an error if the deletion did not succeed.

func (*PolicyMap) DeleteEntry added in v0.15.7 

func (pm *PolicyMap) DeleteEntry(entry *PolicyEntryDump) error

DeleteEntry removes an entry from the PolicyMap. It can be used in conjunction with DumpToSlice() to inspect and delete map entries.

func (*PolicyMap) DeleteKey added in v0.15.7 

func (pm *PolicyMap) DeleteKey(key PolicyKey) error

DeleteKey deletes the key-value pair from the given PolicyMap with PolicyKey k. Returns an error if deletion from the PolicyMap fails.

func (*PolicyMap) Deny added in v0.15.7 

func (pm *PolicyMap) Deny(id uint32, dport uint16, proto u8proto.U8proto, trafficDirection trafficdirection.TrafficDirection) error

Deny pushes an entry into the PolicyMap to deny traffic in the given `trafficDirection` for identity `id` with destination port `dport` over protocol `proto`. It is assumed that `dport` is in host byte-order.

func (*PolicyMap) DenyKey added in v0.15.7 

func (pm *PolicyMap) DenyKey(key PolicyKey) error

DenyKey pushes an entry into the PolicyMap for the given PolicyKey k. Returns an error if the update of the PolicyMap fails.

func (*PolicyMap) Dump 

func (pm *PolicyMap) Dump() (string, error)

func (*PolicyMap) DumpToSlice 

func (pm *PolicyMap) DumpToSlice() (PolicyEntriesDump, error)

func (*PolicyMap) Exists added in v0.15.7 

func (pm *PolicyMap) Exists(id uint32, dport uint16, proto u8proto.U8proto, trafficDirection trafficdirection.TrafficDirection) bool

Exists determines whether PolicyMap currently contains an entry that allows traffic in `trafficDirection` for identity `id` with destination port `dport`over protocol `proto`. It is assumed that `dport` is in host byte-order.

func (*PolicyMap) String 

func (pm *PolicyMap) String() string

String returns a human-readable string representing the policy map.

type PolicyPlumbingMap added in v0.15.7 

type PolicyPlumbingMap struct {
	*bpf.Map
}

PolicyPlumbingMap maps endpoint IDs to the fd for the program which implements its policy.

func OpenCallMap added in v0.15.7 

func OpenCallMap(name string) (*PolicyPlumbingMap, error)

OpenCallMap opens the map that maps endpoint IDs to program file descriptors, which allows tail calling into the policy datapath code from other BPF programs.

Source Files

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