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-rw-r--r--pkg/tcpip/header/ndp_options.go5
-rw-r--r--pkg/tcpip/network/ipv6/ndp.go60
2 files changed, 25 insertions, 40 deletions
diff --git a/pkg/tcpip/header/ndp_options.go b/pkg/tcpip/header/ndp_options.go
index d6cad3a94..b1f39e6e6 100644
--- a/pkg/tcpip/header/ndp_options.go
+++ b/pkg/tcpip/header/ndp_options.go
@@ -148,15 +148,10 @@ const (
// NDP option. That is, the length field for NDP options is in units of
// 8 octets, as per RFC 4861 section 4.6.
lengthByteUnits = 8
-)
-var (
// NDPInfiniteLifetime is a value that represents infinity for the
// 4-byte lifetime fields found in various NDP options. Its value is
// (2^32 - 1)s = 4294967295s.
- //
- // This is a variable instead of a constant so that tests can change
- // this value to a smaller value. It should only be modified by tests.
NDPInfiniteLifetime = time.Second * math.MaxUint32
)
diff --git a/pkg/tcpip/network/ipv6/ndp.go b/pkg/tcpip/network/ipv6/ndp.go
index 57d4afd4d..c44e4ac4e 100644
--- a/pkg/tcpip/network/ipv6/ndp.go
+++ b/pkg/tcpip/network/ipv6/ndp.go
@@ -127,25 +127,17 @@ const (
// maxSLAACAddrLocalRegenAttempts is the maximum number of times to attempt
// SLAAC address regenerations in response to an IPv6 endpoint-local conflict.
maxSLAACAddrLocalRegenAttempts = 10
-)
-var (
// MinPrefixInformationValidLifetimeForUpdate is the minimum Valid
// Lifetime to update the valid lifetime of a generated address by
// SLAAC.
//
- // This is exported as a variable (instead of a constant) so tests
- // can update it to a smaller value.
- //
// Min = 2hrs.
MinPrefixInformationValidLifetimeForUpdate = 2 * time.Hour
// MaxDesyncFactor is the upper bound for the preferred lifetime's desync
// factor for temporary SLAAC addresses.
//
- // This is exported as a variable (instead of a constant) so tests
- // can update it to a smaller value.
- //
// Must be greater than 0.
//
// Max = 10m (from RFC 4941 section 5).
@@ -154,9 +146,6 @@ var (
// MinMaxTempAddrPreferredLifetime is the minimum value allowed for the
// maximum preferred lifetime for temporary SLAAC addresses.
//
- // This is exported as a variable (instead of a constant) so tests
- // can update it to a smaller value.
- //
// This value guarantees that a temporary address is preferred for at
// least 1hr if the SLAAC prefix is valid for at least that time.
MinMaxTempAddrPreferredLifetime = defaultRegenAdvanceDuration + MaxDesyncFactor + time.Hour
@@ -164,9 +153,6 @@ var (
// MinMaxTempAddrValidLifetime is the minimum value allowed for the
// maximum valid lifetime for temporary SLAAC addresses.
//
- // This is exported as a variable (instead of a constant) so tests
- // can update it to a smaller value.
- //
// This value guarantees that a temporary address is valid for at least
// 2hrs if the SLAAC prefix is valid for at least that time.
MinMaxTempAddrValidLifetime = 2 * time.Hour
@@ -566,11 +552,11 @@ type slaacPrefixState struct {
// Must not be nil.
invalidationJob *tcpip.Job
- // Nonzero only when the address is not valid forever.
- validUntil tcpip.MonotonicTime
+ // nil iff the address is valid forever.
+ validUntil *tcpip.MonotonicTime
- // Nonzero only when the address is not preferred forever.
- preferredUntil tcpip.MonotonicTime
+ // nil iff the address is preferred forever.
+ preferredUntil *tcpip.MonotonicTime
// State associated with the stable address generated for the prefix.
stableAddr struct {
@@ -1064,7 +1050,8 @@ func (ndp *ndpState) doSLAAC(prefix tcpip.Subnet, pl, vl time.Duration) {
// The time an address is preferred until is needed to properly generate the
// address.
if pl < header.NDPInfiniteLifetime {
- state.preferredUntil = now.Add(pl)
+ t := now.Add(pl)
+ state.preferredUntil = &t
}
if !ndp.generateSLAACAddr(prefix, &state) {
@@ -1082,7 +1069,8 @@ func (ndp *ndpState) doSLAAC(prefix tcpip.Subnet, pl, vl time.Duration) {
if vl < header.NDPInfiniteLifetime {
state.invalidationJob.Schedule(vl)
- state.validUntil = now.Add(vl)
+ t := now.Add(vl)
+ state.validUntil = &t
}
// If the address is assigned (DAD resolved), generate a temporary address.
@@ -1187,7 +1175,8 @@ func (ndp *ndpState) generateSLAACAddr(prefix tcpip.Subnet, state *slaacPrefixSt
state.stableAddr.localGenerationFailures++
}
- if addressEndpoint := ndp.addAndAcquireSLAACAddr(generatedAddr, stack.AddressConfigSlaac, ndp.ep.protocol.stack.Clock().NowMonotonic().Sub(state.preferredUntil) >= 0 /* deprecated */); addressEndpoint != nil {
+ deprecated := state.preferredUntil != nil && !state.preferredUntil.After(ndp.ep.protocol.stack.Clock().NowMonotonic())
+ if addressEndpoint := ndp.addAndAcquireSLAACAddr(generatedAddr, stack.AddressConfigSlaac, deprecated); addressEndpoint != nil {
state.stableAddr.addressEndpoint = addressEndpoint
state.generationAttempts++
return true
@@ -1248,7 +1237,7 @@ func (ndp *ndpState) generateTempSLAACAddr(prefix tcpip.Subnet, prefixState *sla
// address is the lower of the valid lifetime of the stable address or the
// maximum temporary address valid lifetime.
vl := ndp.configs.MaxTempAddrValidLifetime
- if prefixState.validUntil != (tcpip.MonotonicTime{}) {
+ if prefixState.validUntil != nil {
if prefixVL := prefixState.validUntil.Sub(now); vl > prefixVL {
vl = prefixVL
}
@@ -1264,7 +1253,7 @@ func (ndp *ndpState) generateTempSLAACAddr(prefix tcpip.Subnet, prefixState *sla
// maximum temporary address preferred lifetime - the temporary address desync
// factor.
pl := ndp.configs.MaxTempAddrPreferredLifetime - ndp.temporaryAddressDesyncFactor
- if prefixState.preferredUntil != (tcpip.MonotonicTime{}) {
+ if prefixState.preferredUntil != nil {
if prefixPL := prefixState.preferredUntil.Sub(now); pl > prefixPL {
// Respect the preferred lifetime of the prefix, as per RFC 4941 section
// 3.3 step 4.
@@ -1406,9 +1395,10 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixStat
if !deprecated {
prefixState.deprecationJob.Schedule(pl)
}
- prefixState.preferredUntil = now.Add(pl)
+ t := now.Add(pl)
+ prefixState.preferredUntil = &t
} else {
- prefixState.preferredUntil = tcpip.MonotonicTime{}
+ prefixState.preferredUntil = nil
}
// As per RFC 4862 section 5.5.3.e, update the valid lifetime for prefix:
@@ -1426,14 +1416,14 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixStat
// Handle the infinite valid lifetime separately as we do not schedule a
// job in this case.
prefixState.invalidationJob.Cancel()
- prefixState.validUntil = tcpip.MonotonicTime{}
+ prefixState.validUntil = nil
} else {
var effectiveVl time.Duration
var rl time.Duration
// If the prefix was originally set to be valid forever, assume the
// remaining time to be the maximum possible value.
- if prefixState.validUntil == (tcpip.MonotonicTime{}) {
+ if prefixState.validUntil == nil {
rl = header.NDPInfiniteLifetime
} else {
rl = prefixState.validUntil.Sub(now)
@@ -1448,7 +1438,8 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixStat
if effectiveVl != 0 {
prefixState.invalidationJob.Cancel()
prefixState.invalidationJob.Schedule(effectiveVl)
- prefixState.validUntil = now.Add(effectiveVl)
+ t := now.Add(effectiveVl)
+ prefixState.validUntil = &t
}
}
@@ -1468,8 +1459,8 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixStat
// maximum temporary address valid lifetime. Note, the valid lifetime of a
// temporary address is relative to the address's creation time.
validUntil := tempAddrState.createdAt.Add(ndp.configs.MaxTempAddrValidLifetime)
- if prefixState.validUntil != (tcpip.MonotonicTime{}) && validUntil.Sub(prefixState.validUntil) > 0 {
- validUntil = prefixState.validUntil
+ if prefixState.validUntil != nil && prefixState.validUntil.Before(validUntil) {
+ validUntil = *prefixState.validUntil
}
// If the address is no longer valid, invalidate it immediately. Otherwise,
@@ -1488,14 +1479,15 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixStat
// desync factor. Note, the preferred lifetime of a temporary address is
// relative to the address's creation time.
preferredUntil := tempAddrState.createdAt.Add(ndp.configs.MaxTempAddrPreferredLifetime - ndp.temporaryAddressDesyncFactor)
- if prefixState.preferredUntil != (tcpip.MonotonicTime{}) && preferredUntil.Sub(prefixState.preferredUntil) > 0 {
- preferredUntil = prefixState.preferredUntil
+ if prefixState.preferredUntil != nil && prefixState.preferredUntil.Before(preferredUntil) {
+ preferredUntil = *prefixState.preferredUntil
}
// If the address is no longer preferred, deprecate it immediately.
// Otherwise, schedule the deprecation job again.
newPreferredLifetime := preferredUntil.Sub(now)
tempAddrState.deprecationJob.Cancel()
+
if newPreferredLifetime <= 0 {
ndp.deprecateSLAACAddress(tempAddrState.addressEndpoint)
} else {
@@ -1865,9 +1857,7 @@ func (ndp *ndpState) init(ep *endpoint, dadOptions ip.DADOptions) {
ndp.slaacPrefixes = make(map[tcpip.Subnet]slaacPrefixState)
header.InitialTempIID(ndp.temporaryIIDHistory[:], ndp.ep.protocol.options.TempIIDSeed, ndp.ep.nic.ID())
- if MaxDesyncFactor != 0 {
- ndp.temporaryAddressDesyncFactor = time.Duration(ep.protocol.stack.Rand().Int63n(int64(MaxDesyncFactor)))
- }
+ ndp.temporaryAddressDesyncFactor = time.Duration(ep.protocol.stack.Rand().Int63n(int64(MaxDesyncFactor)))
}
func (ndp *ndpState) SendDADMessage(addr tcpip.Address, nonce []byte) tcpip.Error {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 12:13:17 +0000