rules

package
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 Go to latest Published: Feb 22, 2019 License: Apache-2.0 Imports: 17 Imported by: 0

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Index

Constants

View Source 
const (
	// ChainNamePrefix is a prefix used for all our iptables chain names.  We include a '-' at
	// the end to reduce clashes with other apps.  Our OpenStack DHCP agent uses prefix
	// 'calico-dhcp-', for example.
	ChainNamePrefix = "cali-"
	// IPSetNamePrefix: similarly for IP sets, we use the following prefix; the IP sets layer
	// adds its own "-" so it isn't included here.
	IPSetNamePrefix = "cali"

	ChainFilterInput   = ChainNamePrefix + "INPUT"
	ChainFilterForward = ChainNamePrefix + "FORWARD"
	ChainFilterOutput  = ChainNamePrefix + "OUTPUT"

	ChainRawPrerouting = ChainNamePrefix + "PREROUTING"
	ChainRawOutput     = ChainNamePrefix + "OUTPUT"

	ChainFailsafeIn  = ChainNamePrefix + "failsafe-in"
	ChainFailsafeOut = ChainNamePrefix + "failsafe-out"

	ChainNATPrerouting  = ChainNamePrefix + "PREROUTING"
	ChainNATPostrouting = ChainNamePrefix + "POSTROUTING"
	ChainNATOutput      = ChainNamePrefix + "OUTPUT"
	ChainNATOutgoing    = ChainNamePrefix + "nat-outgoing"

	ChainManglePrerouting = ChainNamePrefix + "PREROUTING"

	IPSetIDNATOutgoingAllPools  = "all-ipam-pools"
	IPSetIDNATOutgoingMasqPools = "masq-ipam-pools"

	IPSetIDAllHostNets = "all-hosts-net"
	IPSetIDThisHostIPs = "this-host"

	ChainFIPDnat = ChainNamePrefix + "fip-dnat"
	ChainFIPSnat = ChainNamePrefix + "fip-snat"

	PolicyInboundPfx   PolicyChainNamePrefix  = ChainNamePrefix + "pi-"
	PolicyOutboundPfx  PolicyChainNamePrefix  = ChainNamePrefix + "po-"
	ProfileInboundPfx  ProfileChainNamePrefix = ChainNamePrefix + "pri-"
	ProfileOutboundPfx ProfileChainNamePrefix = ChainNamePrefix + "pro-"

	ChainWorkloadToHost       = ChainNamePrefix + "wl-to-host"
	ChainFromWorkloadDispatch = ChainNamePrefix + "from-wl-dispatch"
	ChainToWorkloadDispatch   = ChainNamePrefix + "to-wl-dispatch"

	ChainDispatchToHostEndpoint          = ChainNamePrefix + "to-host-endpoint"
	ChainDispatchFromHostEndpoint        = ChainNamePrefix + "from-host-endpoint"
	ChainDispatchToHostEndpointForward   = ChainNamePrefix + "to-hep-forward"
	ChainDispatchFromHostEndPointForward = ChainNamePrefix + "from-hep-forward"
	ChainDispatchSetEndPointMark         = ChainNamePrefix + "set-endpoint-mark"
	ChainDispatchFromEndPointMark        = ChainNamePrefix + "from-endpoint-mark"

	ChainForwardCheck        = ChainNamePrefix + "forward-check"
	ChainForwardEndpointMark = ChainNamePrefix + "forward-endpoint-mark"

	WorkloadToEndpointPfx   = ChainNamePrefix + "tw-"
	WorkloadFromEndpointPfx = ChainNamePrefix + "fw-"

	SetEndPointMarkPfx = ChainNamePrefix + "sm-"

	HostToEndpointPfx          = ChainNamePrefix + "th-"
	HostFromEndpointPfx        = ChainNamePrefix + "fh-"
	HostToEndpointForwardPfx   = ChainNamePrefix + "thfw-"
	HostFromEndpointForwardPfx = ChainNamePrefix + "fhfw-"

	RuleHashPrefix = "cali:"

	// HistoricNATRuleInsertRegex is a regex pattern to match to match
	// special-case rules inserted by old versions of felix.  Specifically,
	// Python felix used to insert a masquerade rule directly into the
	// POSTROUTING chain.
	//
	// Note: this regex depends on the output format of iptables-save so,
	// where possible, it's best to match only on part of the rule that
	// we're sure can't change (such as the ipset name in the masquerade
	// rule).
	HistoricInsertedNATRuleRegex = `-A POSTROUTING .* felix-masq-ipam-pools .*|` +
		`-A POSTROUTING -o tunl0 -m addrtype ! --src-type LOCAL --limit-iface-out -m addrtype --src-type LOCAL -j MASQUERADE`
)
View Source 
const (
	ProtoIPIP   = 4
	ProtoTCP    = 6
	ProtoUDP    = 17
	ProtoICMPv6 = 58
)

Variables

View Source 
var (
	// AllHistoricChainNamePrefixes lists all the prefixes that we've used for chains.  Keeping
	// track of the old names lets us clean them up.
	AllHistoricChainNamePrefixes = []string{

		"cali-",

		"califw-",
		"calitw-",
		"califh-",
		"calith-",
		"calipi-",
		"calipo-",

		"felix-",
	}
	// AllHistoricIPSetNamePrefixes, similarly contains all the prefixes we've ever used for IP
	// sets.
	AllHistoricIPSetNamePrefixes = []string{"felix-", "cali"}
	// LegacyV4IPSetNames contains some extra IP set names that were used in older versions of
	// Felix and don't fit our versioned pattern.
	LegacyV4IPSetNames = []string{"felix-masq-ipam-pools", "felix-all-ipam-pools"}
)
View Source 
var SkipRule = errors.New("Rule skipped")

Functions

func EndpointChainName 

func EndpointChainName(prefix string, ifaceName string) string

func PolicyChainName 

func PolicyChainName(prefix PolicyChainNamePrefix, polID *proto.PolicyID) string

func ProfileChainName 

func ProfileChainName(prefix ProfileChainNamePrefix, profID *proto.ProfileID) string

func SplitPortList 

func SplitPortList(ports []*proto.PortRange) (splits [][]*proto.PortRange)

SplitPortList splits the input list of ports into groups containing up to 15 port numbers. If the input list is empty, it returns an empty slice.

The requirement to split into groups of 15, comes from iptables' limit on the number of ports "slots" in a multiport match. A single port takes up one slot, a range of ports requires 2.

Types

type Config 

type Config struct {
	IPSetConfigV4 *ipsets.IPVersionConfig
	IPSetConfigV6 *ipsets.IPVersionConfig

	WorkloadIfacePrefixes []string

	IptablesMarkAccept   uint32
	IptablesMarkPass     uint32
	IptablesMarkScratch0 uint32
	IptablesMarkScratch1 uint32
	IptablesMarkEndpoint uint32
	// IptablesMarkNonCaliEndpoint is an endpoint mark which is reserved
	// to mark non-calico (workload or host) endpoint.
	IptablesMarkNonCaliEndpoint uint32

	KubeNodePortRanges     []numorstring.Port
	KubeIPVSSupportEnabled bool

	OpenStackMetadataIP          net.IP
	OpenStackMetadataPort        uint16
	OpenStackSpecialCasesEnabled bool

	IPIPEnabled bool
	// IPIPTunnelAddress is an address chosen from an IPAM pool, used as a source address
	// by the host when sending traffic to a workload over IPIP.
	IPIPTunnelAddress net.IP

	IptablesLogPrefix         string
	EndpointToHostAction      string
	IptablesFilterAllowAction string
	IptablesMangleAllowAction string

	FailsafeInboundHostPorts  []config.ProtoPort
	FailsafeOutboundHostPorts []config.ProtoPort

	DisableConntrackInvalid bool

	NATPortRange                       numorstring.Port
	IptablesNATOutgoingInterfaceFilter string
}

type DefaultEPMarkManager 

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

func (*DefaultEPMarkManager) GetEndpointMark 

func (epmm *DefaultEPMarkManager) GetEndpointMark(ep string) (uint32, error)

func (*DefaultEPMarkManager) GetMask 

func (epmm *DefaultEPMarkManager) GetMask() uint32

func (*DefaultEPMarkManager) ReleaseEndpointMark 

func (epmm *DefaultEPMarkManager) ReleaseEndpointMark(ep string)

func (*DefaultEPMarkManager) SetEndpointMark 

func (epmm *DefaultEPMarkManager) SetEndpointMark(ep string, mark uint32) error

This is used to set a mark for an endpoint from previous allocated mark. The endpoint should not have a mark already.

type DefaultRuleRenderer 

type DefaultRuleRenderer struct {
	Config
	// contains filtered or unexported fields
}

func (*DefaultRuleRenderer) CalculateActions 

func (r *DefaultRuleRenderer) CalculateActions(pRule *proto.Rule, ipVersion uint8) (mark uint32, actions []iptables.Action)

func (*DefaultRuleRenderer) CalculateRuleMatch 

func (r *DefaultRuleRenderer) CalculateRuleMatch(pRule *proto.Rule, ipVersion uint8) (iptables.MatchCriteria, error)

func (*DefaultRuleRenderer) DNATsToIptablesChains 

func (r *DefaultRuleRenderer) DNATsToIptablesChains(dnats map[string]string) []*iptables.Chain

func (*DefaultRuleRenderer) EndpointMarkDispatchChains 

func (r *DefaultRuleRenderer) EndpointMarkDispatchChains(
	epMarkMapper EndpointMarkMapper,
	wlEndpoints map[proto.WorkloadEndpointID]*proto.WorkloadEndpoint,
	hepEndpoints map[string]proto.HostEndpointID,
) []*Chain

In some scenario, e.g. packet goes to an kubernetes ipvs service ip. Traffic goes through input/output filter chain instead of forward filter chain. It is not feasible to match on an incoming workload/host interface with service ips. Assemble a set-endpoint-mark chain to set the endpoint mark matching on the incoming workload/host interface and a from-endpoint-mark chain to jump to a corresponding endpoint chain matching on its endpoint mark.

func (*DefaultRuleRenderer) FromHostDispatchChains 

func (r *DefaultRuleRenderer) FromHostDispatchChains(
	endpoints map[string]proto.HostEndpointID,
) []*Chain

func (*DefaultRuleRenderer) HostDispatchChains 

func (r *DefaultRuleRenderer) HostDispatchChains(
	endpoints map[string]proto.HostEndpointID,
	applyOnForward bool,
) []*Chain

func (*DefaultRuleRenderer) HostEndpointToFilterChains 

func (r *DefaultRuleRenderer) HostEndpointToFilterChains(
	ifaceName string,
	epMarkMapper EndpointMarkMapper,
	ingressPolicyNames []string,
	egressPolicyNames []string,
	ingressForwardPolicyNames []string,
	egressForwardPolicyNames []string,
	profileIDs []string,
) []*Chain

func (*DefaultRuleRenderer) HostEndpointToMangleChains 

func (r *DefaultRuleRenderer) HostEndpointToMangleChains(
	ifaceName string,
	preDNATPolicyNames []string,
) []*Chain

func (*DefaultRuleRenderer) HostEndpointToRawChains 

func (r *DefaultRuleRenderer) HostEndpointToRawChains(
	ifaceName string,
	ingressPolicyNames []string,
	egressPolicyNames []string,
) []*Chain

func (*DefaultRuleRenderer) MakeNatOutgoingRule 

func (r *DefaultRuleRenderer) MakeNatOutgoingRule(protocol string, action iptables.Action, ipVersion uint8) iptables.Rule

func (*DefaultRuleRenderer) NATOutgoingChain 

func (r *DefaultRuleRenderer) NATOutgoingChain(natOutgoingActive bool, ipVersion uint8) *iptables.Chain

func (*DefaultRuleRenderer) PolicyToIptablesChains 

func (r *DefaultRuleRenderer) PolicyToIptablesChains(policyID *proto.PolicyID, policy *proto.Policy, ipVersion uint8) []*iptables.Chain

func (*DefaultRuleRenderer) ProfileToIptablesChains 

func (r *DefaultRuleRenderer) ProfileToIptablesChains(profileID *proto.ProfileID, profile *proto.Profile, ipVersion uint8) []*iptables.Chain

func (*DefaultRuleRenderer) ProtoRuleToIptablesRules 

func (r *DefaultRuleRenderer) ProtoRuleToIptablesRules(pRule *proto.Rule, ipVersion uint8) []iptables.Rule

func (*DefaultRuleRenderer) ProtoRulesToIptablesRules 

func (r *DefaultRuleRenderer) ProtoRulesToIptablesRules(protoRules []*proto.Rule, ipVersion uint8) []iptables.Rule

func (*DefaultRuleRenderer) SNATsToIptablesChains 

func (r *DefaultRuleRenderer) SNATsToIptablesChains(snats map[string]string) []*iptables.Chain

func (*DefaultRuleRenderer) StaticFilterForwardChains 

func (r *DefaultRuleRenderer) StaticFilterForwardChains() []*Chain

func (*DefaultRuleRenderer) StaticFilterInputChains 

func (r *DefaultRuleRenderer) StaticFilterInputChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) StaticFilterInputForwardCheckChain 

func (r *DefaultRuleRenderer) StaticFilterInputForwardCheckChain(ipVersion uint8) *Chain

Forward check chain is to check if a packet belongs to a forwarded traffic or not. With kube-proxy running in ipvs mode, both local or forwarded traffic goes through INPUT filter chain.

func (*DefaultRuleRenderer) StaticFilterOutputChains 

func (r *DefaultRuleRenderer) StaticFilterOutputChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) StaticFilterOutputForwardEndpointMarkChain 

func (r *DefaultRuleRenderer) StaticFilterOutputForwardEndpointMarkChain() *Chain

With kube-proxy running in ipvs mode, we categorise traffic going through OUTPUT chain into three classes. Class 1. forwarded packet originated from a calico workload or host endpoint --> INPUT filter --> OUTPUT filter Class 2. forwarded packet originated from a non calico endpoint --> INPUT filter --> OUTPUT filter Class 3. local process originated packet --> OUTPUT filter This function handles traffic in Class 1 and Class 2.

func (*DefaultRuleRenderer) StaticFilterTableChains 

func (r *DefaultRuleRenderer) StaticFilterTableChains(ipVersion uint8) (chains []*Chain)

func (*DefaultRuleRenderer) StaticManglePreroutingChain 

func (r *DefaultRuleRenderer) StaticManglePreroutingChain(ipVersion uint8) *Chain

func (*DefaultRuleRenderer) StaticMangleTableChains 

func (r *DefaultRuleRenderer) StaticMangleTableChains(ipVersion uint8) (chains []*Chain)

func (*DefaultRuleRenderer) StaticNATOutputChains 

func (r *DefaultRuleRenderer) StaticNATOutputChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) StaticNATPostroutingChains 

func (r *DefaultRuleRenderer) StaticNATPostroutingChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) StaticNATPreroutingChains 

func (r *DefaultRuleRenderer) StaticNATPreroutingChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) StaticNATTableChains 

func (r *DefaultRuleRenderer) StaticNATTableChains(ipVersion uint8) (chains []*Chain)

func (*DefaultRuleRenderer) StaticRawOutputChain 

func (r *DefaultRuleRenderer) StaticRawOutputChain() *Chain

func (*DefaultRuleRenderer) StaticRawPreroutingChain 

func (r *DefaultRuleRenderer) StaticRawPreroutingChain(ipVersion uint8) *Chain

func (*DefaultRuleRenderer) StaticRawTableChains 

func (r *DefaultRuleRenderer) StaticRawTableChains(ipVersion uint8) []*Chain

func (*DefaultRuleRenderer) WorkloadDispatchChains 

func (r *DefaultRuleRenderer) WorkloadDispatchChains(
	endpoints map[proto.WorkloadEndpointID]*proto.WorkloadEndpoint,
) []*Chain

func (*DefaultRuleRenderer) WorkloadEndpointToIptablesChains 

func (r *DefaultRuleRenderer) WorkloadEndpointToIptablesChains(
	ifaceName string,
	epMarkMapper EndpointMarkMapper,
	adminUp bool,
	ingressPolicies []string,
	egressPolicies []string,
	profileIDs []string,
) []*Chain

type EndpointMarkMapper 

type EndpointMarkMapper interface {
	GetMask() uint32
	GetEndpointMark(ep string) (uint32, error)
	ReleaseEndpointMark(ep string)
	SetEndpointMark(ep string, mark uint32) error
}

Endpoint Mark Mapper (EPM) provides set of functions to manage allocation/free endpoint mark bit given a mark bit mask. Note: This is not thread safe.

func NewEndpointMarkMapper 

func NewEndpointMarkMapper(markMask, nonCaliMark uint32) EndpointMarkMapper

func NewEndpointMarkMapperWithShim 

func NewEndpointMarkMapperWithShim(markMask, nonCaliMark uint32, hash32 HashCalculator32) EndpointMarkMapper

type HashCalculator32 

type HashCalculator32 interface {
	// Write (via the embedded io.Writer interface) adds more data to the running hash.
	// It never returns an error.
	io.Writer

	// Sum32 returns a hash result of uint32.
	// It does not change the underlying hash state.
	Sum32() uint32

	// Reset resets the Hash to its initial state.
	Reset()
}

This interface has subset of functions of built in hash32 interface.

type PolicyChainNamePrefix 

type PolicyChainNamePrefix string

Typedefs to prevent accidentally passing the wrong prefix to the Policy/ProfileChainName()

type ProfileChainNamePrefix 

type ProfileChainNamePrefix string

type RuleRenderer 

type RuleRenderer interface {
	StaticFilterTableChains(ipVersion uint8) []*iptables.Chain
	StaticNATTableChains(ipVersion uint8) []*iptables.Chain
	StaticRawTableChains(ipVersion uint8) []*iptables.Chain
	StaticMangleTableChains(ipVersion uint8) []*iptables.Chain

	WorkloadDispatchChains(map[proto.WorkloadEndpointID]*proto.WorkloadEndpoint) []*iptables.Chain
	WorkloadEndpointToIptablesChains(
		ifaceName string,
		epMarkMapper EndpointMarkMapper,
		adminUp bool,
		ingressPolicies []string,
		egressPolicies []string,
		profileIDs []string,
	) []*iptables.Chain

	EndpointMarkDispatchChains(
		epMarkMapper EndpointMarkMapper,
		wlEndpoints map[proto.WorkloadEndpointID]*proto.WorkloadEndpoint,
		hepEndpoints map[string]proto.HostEndpointID,
	) []*iptables.Chain

	HostDispatchChains(map[string]proto.HostEndpointID, bool) []*iptables.Chain
	FromHostDispatchChains(map[string]proto.HostEndpointID) []*iptables.Chain
	HostEndpointToFilterChains(
		ifaceName string,
		epMarkMapper EndpointMarkMapper,
		ingressPolicyNames []string,
		egressPolicyNames []string,
		ingressForwardPolicyNames []string,
		egressForwardPolicyNames []string,
		profileIDs []string,
	) []*iptables.Chain
	HostEndpointToRawChains(
		ifaceName string,
		ingressPolicyNames []string,
		egressPolicyNames []string,
	) []*iptables.Chain
	HostEndpointToMangleChains(
		ifaceName string,
		preDNATPolicyNames []string,
	) []*iptables.Chain

	PolicyToIptablesChains(policyID *proto.PolicyID, policy *proto.Policy, ipVersion uint8) []*iptables.Chain
	ProfileToIptablesChains(profileID *proto.ProfileID, policy *proto.Profile, ipVersion uint8) []*iptables.Chain
	ProtoRuleToIptablesRules(pRule *proto.Rule, ipVersion uint8) []iptables.Rule

	MakeNatOutgoingRule(protocol string, action iptables.Action, ipVersion uint8) iptables.Rule
	NATOutgoingChain(active bool, ipVersion uint8) *iptables.Chain

	DNATsToIptablesChains(dnats map[string]string) []*iptables.Chain
	SNATsToIptablesChains(snats map[string]string) []*iptables.Chain
}

func NewRenderer 

func NewRenderer(config Config) RuleRenderer

Source Files

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