Deduplicate code in ipv6.protocol

PiperOrigin-RevId: 344009602

2 files changed, 29 insertions, 52 deletions

diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index fa2adb0b3..afc7ecf2a 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -273,7 +273,7 @@ func (e *endpoint) Enable() *tcpip.Error {
 	}
 
 	// Do not auto-generate an IPv6 link-local address for loopback devices.
-	if e.protocol.autoGenIPv6LinkLocal && !e.nic.IsLoopback() {
+	if e.protocol.options.AutoGenLinkLocal && !e.nic.IsLoopback() {
 		// The valid and preferred lifetime is infinite for the auto-generated
 		// link-local address.
 		e.mu.ndp.doSLAAC(header.IPv6LinkLocalPrefix.Subnet(), header.NDPInfiniteLifetime, header.NDPInfiniteLifetime)
@@ -1407,7 +1407,8 @@ var _ stack.NetworkProtocol = (*protocol)(nil)
 var _ fragmentation.TimeoutHandler = (*protocol)(nil)
 
 type protocol struct {
-	stack *stack.Stack
+	stack   *stack.Stack
+	options Options
 
 	mu struct {
 		sync.RWMutex
@@ -1431,26 +1432,6 @@ type protocol struct {
 	forwarding uint32
 
 	fragmentation *fragmentation.Fragmentation
-
-	// ndpDisp is the NDP event dispatcher that is used to send the netstack
-	// integrator NDP related events.
-	ndpDisp NDPDispatcher
-
-	// ndpConfigs is the default NDP configurations used by an IPv6 endpoint.
-	ndpConfigs NDPConfigurations
-
-	// opaqueIIDOpts hold the options for generating opaque interface identifiers
-	// (IIDs) as outlined by RFC 7217.
-	opaqueIIDOpts OpaqueInterfaceIdentifierOptions
-
-	// tempIIDSeed is used to seed the initial temporary interface identifier
-	// history value used to generate IIDs for temporary SLAAC addresses.
-	tempIIDSeed []byte
-
-	// autoGenIPv6LinkLocal determines whether or not the stack attempts to
-	// auto-generate an IPv6 link-local address for newly enabled non-loopback
-	// NICs. See the AutoGenIPv6LinkLocal field of Options for more details.
-	autoGenIPv6LinkLocal bool
 }
 
 // Number returns the ipv6 protocol number.
@@ -1486,7 +1467,7 @@ func (p *protocol) NewEndpoint(nic stack.NetworkInterface, linkAddrCache stack.L
 	e.mu.addressableEndpointState.Init(e)
 	e.mu.ndp = ndpState{
 		ep:             e,
-		configs:        p.ndpConfigs,
+		configs:        p.options.NDPConfigs,
 		dad:            make(map[tcpip.Address]dadState),
 		defaultRouters: make(map[tcpip.Address]defaultRouterState),
 		onLinkPrefixes: make(map[tcpip.Subnet]onLinkPrefixState),
@@ -1615,17 +1596,17 @@ type Options struct {
 	// NDPConfigs is the default NDP configurations used by interfaces.
 	NDPConfigs NDPConfigurations
 
-	// AutoGenIPv6LinkLocal determines whether or not the stack attempts to
-	// auto-generate an IPv6 link-local address for newly enabled non-loopback
+	// AutoGenLinkLocal determines whether or not the stack attempts to
+	// auto-generate a link-local address for newly enabled non-loopback
 	// NICs.
 	//
 	// Note, setting this to true does not mean that a link-local address is
 	// assigned right away, or at all. If Duplicate Address Detection is enabled,
 	// an address is only assigned if it successfully resolves. If it fails, no
-	// further attempts are made to auto-generate an IPv6 link-local adddress.
+	// further attempts are made to auto-generate a link-local adddress.
 	//
 	// The generated link-local address follows RFC 4291 Appendix A guidelines.
-	AutoGenIPv6LinkLocal bool
+	AutoGenLinkLocal bool
 
 	// NDPDisp is the NDP event dispatcher that an integrator can provide to
 	// receive NDP related events.
@@ -1660,15 +1641,11 @@ func NewProtocolWithOptions(opts Options) stack.NetworkProtocolFactory {
 
 	return func(s *stack.Stack) stack.NetworkProtocol {
 		p := &protocol{
-			stack:  s,
+			stack:   s,
+			options: opts,
+
 			ids:    ids,
 			hashIV: hashIV,
-
-			ndpDisp:              opts.NDPDisp,
-			ndpConfigs:           opts.NDPConfigs,
-			opaqueIIDOpts:        opts.OpaqueIIDOpts,
-			tempIIDSeed:          opts.TempIIDSeed,
-			autoGenIPv6LinkLocal: opts.AutoGenIPv6LinkLocal,
 		}
 		p.fragmentation = fragmentation.NewFragmentation(header.IPv6FragmentExtHdrFragmentOffsetBytesPerUnit, fragmentation.HighFragThreshold, fragmentation.LowFragThreshold, ReassembleTimeout, s.Clock(), p)
 		p.mu.eps = make(map[*endpoint]struct{})
diff --git a/pkg/tcpip/network/ipv6/ndp.go b/pkg/tcpip/network/ipv6/ndp.go
index 40da011f8..c138358af 100644
--- a/pkg/tcpip/network/ipv6/ndp.go
+++ b/pkg/tcpip/network/ipv6/ndp.go
@@ -648,7 +648,7 @@ func (ndp *ndpState) startDuplicateAddressDetection(addr tcpip.Address, addressE
 
 		// Consider DAD to have resolved even if no DAD messages were actually
 		// transmitted.
-		if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+		if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 			ndpDisp.OnDuplicateAddressDetectionStatus(ndp.ep.nic.ID(), addr, true, nil)
 		}
 
@@ -720,7 +720,7 @@ func (ndp *ndpState) startDuplicateAddressDetection(addr tcpip.Address, addressE
 		// integrator know DAD has completed.
 		delete(ndp.dad, addr)
 
-		if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+		if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 			ndpDisp.OnDuplicateAddressDetectionStatus(ndp.ep.nic.ID(), addr, dadDone, err)
 		}
 
@@ -823,7 +823,7 @@ func (ndp *ndpState) stopDuplicateAddressDetection(addr tcpip.Address) {
 	delete(ndp.dad, addr)
 
 	// Let the integrator know DAD did not resolve.
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnDuplicateAddressDetectionStatus(ndp.ep.nic.ID(), addr, false, nil)
 	}
 }
@@ -846,7 +846,7 @@ func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) {
 	// Only worry about the DHCPv6 configuration if we have an NDPDispatcher as we
 	// only inform the dispatcher on configuration changes. We do nothing else
 	// with the information.
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		var configuration DHCPv6ConfigurationFromNDPRA
 		switch {
 		case ra.ManagedAddrConfFlag():
@@ -903,20 +903,20 @@ func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) {
 	for opt, done, _ := it.Next(); !done; opt, done, _ = it.Next() {
 		switch opt := opt.(type) {
 		case header.NDPRecursiveDNSServer:
-			if ndp.ep.protocol.ndpDisp == nil {
+			if ndp.ep.protocol.options.NDPDisp == nil {
 				continue
 			}
 
 			addrs, _ := opt.Addresses()
-			ndp.ep.protocol.ndpDisp.OnRecursiveDNSServerOption(ndp.ep.nic.ID(), addrs, opt.Lifetime())
+			ndp.ep.protocol.options.NDPDisp.OnRecursiveDNSServerOption(ndp.ep.nic.ID(), addrs, opt.Lifetime())
 
 		case header.NDPDNSSearchList:
-			if ndp.ep.protocol.ndpDisp == nil {
+			if ndp.ep.protocol.options.NDPDisp == nil {
 				continue
 			}
 
 			domainNames, _ := opt.DomainNames()
-			ndp.ep.protocol.ndpDisp.OnDNSSearchListOption(ndp.ep.nic.ID(), domainNames, opt.Lifetime())
+			ndp.ep.protocol.options.NDPDisp.OnDNSSearchListOption(ndp.ep.nic.ID(), domainNames, opt.Lifetime())
 
 		case header.NDPPrefixInformation:
 			prefix := opt.Subnet()
@@ -964,7 +964,7 @@ func (ndp *ndpState) invalidateDefaultRouter(ip tcpip.Address) {
 	delete(ndp.defaultRouters, ip)
 
 	// Let the integrator know a discovered default router is invalidated.
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnDefaultRouterInvalidated(ndp.ep.nic.ID(), ip)
 	}
 }
@@ -976,7 +976,7 @@ func (ndp *ndpState) invalidateDefaultRouter(ip tcpip.Address) {
 //
 // The IPv6 endpoint that ndp belongs to MUST be locked.
 func (ndp *ndpState) rememberDefaultRouter(ip tcpip.Address, rl time.Duration) {
-	ndpDisp := ndp.ep.protocol.ndpDisp
+	ndpDisp := ndp.ep.protocol.options.NDPDisp
 	if ndpDisp == nil {
 		return
 	}
@@ -1006,7 +1006,7 @@ func (ndp *ndpState) rememberDefaultRouter(ip tcpip.Address, rl time.Duration) {
 //
 // The IPv6 endpoint that ndp belongs to MUST be locked.
 func (ndp *ndpState) rememberOnLinkPrefix(prefix tcpip.Subnet, l time.Duration) {
-	ndpDisp := ndp.ep.protocol.ndpDisp
+	ndpDisp := ndp.ep.protocol.options.NDPDisp
 	if ndpDisp == nil {
 		return
 	}
@@ -1047,7 +1047,7 @@ func (ndp *ndpState) invalidateOnLinkPrefix(prefix tcpip.Subnet) {
 	delete(ndp.onLinkPrefixes, prefix)
 
 	// Let the integrator know a discovered on-link prefix is invalidated.
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnOnLinkPrefixInvalidated(ndp.ep.nic.ID(), prefix)
 	}
 }
@@ -1225,7 +1225,7 @@ func (ndp *ndpState) doSLAAC(prefix tcpip.Subnet, pl, vl time.Duration) {
 // The IPv6 endpoint that ndp belongs to MUST be locked.
 func (ndp *ndpState) addAndAcquireSLAACAddr(addr tcpip.AddressWithPrefix, configType stack.AddressConfigType, deprecated bool) stack.AddressEndpoint {
 	// Inform the integrator that we have a new SLAAC address.
-	ndpDisp := ndp.ep.protocol.ndpDisp
+	ndpDisp := ndp.ep.protocol.options.NDPDisp
 	if ndpDisp == nil {
 		return nil
 	}
@@ -1272,7 +1272,7 @@ func (ndp *ndpState) generateSLAACAddr(prefix tcpip.Subnet, state *slaacPrefixSt
 		}
 
 		dadCounter := state.generationAttempts + state.stableAddr.localGenerationFailures
-		if oIID := ndp.ep.protocol.opaqueIIDOpts; oIID.NICNameFromID != nil {
+		if oIID := ndp.ep.protocol.options.OpaqueIIDOpts; oIID.NICNameFromID != nil {
 			addrBytes = header.AppendOpaqueInterfaceIdentifier(
 				addrBytes[:header.IIDOffsetInIPv6Address],
 				prefix,
@@ -1676,7 +1676,7 @@ func (ndp *ndpState) deprecateSLAACAddress(addressEndpoint stack.AddressEndpoint
 	}
 
 	addressEndpoint.SetDeprecated(true)
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnAutoGenAddressDeprecated(ndp.ep.nic.ID(), addressEndpoint.AddressWithPrefix())
 	}
 }
@@ -1701,7 +1701,7 @@ func (ndp *ndpState) invalidateSLAACPrefix(prefix tcpip.Subnet, state slaacPrefi
 //
 // The IPv6 endpoint that ndp belongs to MUST be locked.
 func (ndp *ndpState) cleanupSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix, invalidatePrefix bool) {
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnAutoGenAddressInvalidated(ndp.ep.nic.ID(), addr)
 	}
 
@@ -1761,7 +1761,7 @@ func (ndp *ndpState) invalidateTempSLAACAddr(tempAddrs map[tcpip.Address]tempSLA
 //
 // The IPv6 endpoint that ndp belongs to MUST be locked.
 func (ndp *ndpState) cleanupTempSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix, invalidateAddr bool) {
-	if ndpDisp := ndp.ep.protocol.ndpDisp; ndpDisp != nil {
+	if ndpDisp := ndp.ep.protocol.options.NDPDisp; ndpDisp != nil {
 		ndpDisp.OnAutoGenAddressInvalidated(ndp.ep.nic.ID(), addr)
 	}
 
@@ -2005,7 +2005,7 @@ func (ndp *ndpState) stopSolicitingRouters() {
 // initializeTempAddrState initializes state related to temporary SLAAC
 // addresses.
 func (ndp *ndpState) initializeTempAddrState() {
-	header.InitialTempIID(ndp.temporaryIIDHistory[:], ndp.ep.protocol.tempIIDSeed, ndp.ep.nic.ID())
+	header.InitialTempIID(ndp.temporaryIIDHistory[:], ndp.ep.protocol.options.TempIIDSeed, ndp.ep.nic.ID())
 
 	if MaxDesyncFactor != 0 {
 		ndp.temporaryAddressDesyncFactor = time.Duration(rand.Int63n(int64(MaxDesyncFactor)))