diff options
Diffstat (limited to 'pkg/tcpip/stack')
| -rw-r--r-- | pkg/tcpip/stack/BUILD | 5 | ||||
| -rw-r--r-- | pkg/tcpip/stack/addressable_endpoint_state.go | 717 | ||||
| -rw-r--r-- | pkg/tcpip/stack/addressable_endpoint_state_test.go | 72 | ||||
| -rw-r--r-- | pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go | 40 | ||||
| -rw-r--r-- | pkg/tcpip/stack/forwarder_test.go | 45 | ||||
| -rw-r--r-- | pkg/tcpip/stack/ndp.go | 1973 | ||||
| -rw-r--r-- | pkg/tcpip/stack/ndp_test.go | 815 | ||||
| -rw-r--r-- | pkg/tcpip/stack/neighbor_entry.go | 17 | ||||
| -rw-r--r-- | pkg/tcpip/stack/neighbor_entry_test.go | 20 | ||||
| -rw-r--r-- | pkg/tcpip/stack/nic.go | 1293 | ||||
| -rw-r--r-- | pkg/tcpip/stack/nic_test.go | 138 | ||||
| -rw-r--r-- | pkg/tcpip/stack/registration.go | 261 | ||||
| -rw-r--r-- | pkg/tcpip/stack/route.go | 118 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack.go | 337 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack_test.go | 207 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_demuxer.go | 4 |
16 files changed, 2044 insertions, 4018 deletions
diff --git a/pkg/tcpip/stack/BUILD b/pkg/tcpip/stack/BUILD index 7f1d79115..2eaeab779 100644 --- a/pkg/tcpip/stack/BUILD +++ b/pkg/tcpip/stack/BUILD @@ -54,8 +54,8 @@ go_template_instance( go_library( name = "stack", srcs = [ + "addressable_endpoint_state.go", "conntrack.go", - "dhcpv6configurationfromndpra_string.go", "forwarder.go", "headertype_string.go", "icmp_rate_limit.go", @@ -65,7 +65,6 @@ go_library( "iptables_types.go", "linkaddrcache.go", "linkaddrentry_list.go", - "ndp.go", "neighbor_cache.go", "neighbor_entry.go", "neighbor_entry_list.go", @@ -106,6 +105,7 @@ go_test( name = "stack_x_test", size = "medium", srcs = [ + "addressable_endpoint_state_test.go", "ndp_test.go", "nud_test.go", "stack_test.go", @@ -116,6 +116,7 @@ go_test( deps = [ ":stack", "//pkg/rand", + "//pkg/sync", "//pkg/tcpip", "//pkg/tcpip/buffer", "//pkg/tcpip/checker", diff --git a/pkg/tcpip/stack/addressable_endpoint_state.go b/pkg/tcpip/stack/addressable_endpoint_state.go new file mode 100644 index 000000000..270ac4977 --- /dev/null +++ b/pkg/tcpip/stack/addressable_endpoint_state.go @@ -0,0 +1,717 @@ +// Copyright 2020 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package stack + +import ( + "fmt" + + "gvisor.dev/gvisor/pkg/sync" + "gvisor.dev/gvisor/pkg/tcpip" +) + +var _ GroupAddressableEndpoint = (*AddressableEndpointState)(nil) +var _ AddressableEndpoint = (*AddressableEndpointState)(nil) + +// AddressableEndpointState is an implementation of an AddressableEndpoint. +type AddressableEndpointState struct { + networkEndpoint NetworkEndpoint + + // Lock ordering (from outer to inner lock ordering): + // + // AddressableEndpointState.mu + // addressState.mu + mu struct { + sync.RWMutex + + endpoints map[tcpip.Address]*addressState + primary []*addressState + + // groups holds the mapping between group addresses and the number of times + // they have been joined. + groups map[tcpip.Address]uint32 + } +} + +// Init initializes the AddressableEndpointState with networkEndpoint. +// +// Must be called before calling any other function on m. +func (a *AddressableEndpointState) Init(networkEndpoint NetworkEndpoint) { + a.networkEndpoint = networkEndpoint + + a.mu.Lock() + defer a.mu.Unlock() + a.mu.endpoints = make(map[tcpip.Address]*addressState) + a.mu.groups = make(map[tcpip.Address]uint32) +} + +// ReadOnlyAddressableEndpointState provides read-only access to an +// AddressableEndpointState. +type ReadOnlyAddressableEndpointState struct { + inner *AddressableEndpointState +} + +// AddrOrMatching returns an endpoint for the passed address that is consisdered +// bound to the wrapped AddressableEndpointState. +// +// If addr is an exact match with an existing address, that address is returned. +// Otherwise, f is called with each address and the address that f returns true +// for is returned. +// +// Returns nil of no address matches. +func (m ReadOnlyAddressableEndpointState) AddrOrMatching(addr tcpip.Address, spoofingOrPrimiscuous bool, f func(AddressEndpoint) bool) AddressEndpoint { + m.inner.mu.RLock() + defer m.inner.mu.RUnlock() + + if ep, ok := m.inner.mu.endpoints[addr]; ok { + if ep.IsAssigned(spoofingOrPrimiscuous) && ep.IncRef() { + return ep + } + } + + for _, ep := range m.inner.mu.endpoints { + if ep.IsAssigned(spoofingOrPrimiscuous) && f(ep) && ep.IncRef() { + return ep + } + } + + return nil +} + +// Lookup returns the AddressEndpoint for the passed address. +// +// Returns nil if the passed address is not associated with the +// AddressableEndpointState. +func (m ReadOnlyAddressableEndpointState) Lookup(addr tcpip.Address) AddressEndpoint { + m.inner.mu.RLock() + defer m.inner.mu.RUnlock() + + ep, ok := m.inner.mu.endpoints[addr] + if !ok { + return nil + } + return ep +} + +// ForEach calls f for each address pair. +// +// If f returns false, f is no longer be called. +func (m ReadOnlyAddressableEndpointState) ForEach(f func(AddressEndpoint) bool) { + m.inner.mu.RLock() + defer m.inner.mu.RUnlock() + + for _, ep := range m.inner.mu.endpoints { + if !f(ep) { + return + } + } +} + +// ForEachPrimaryEndpoint calls f for each primary address. +// +// If f returns false, f is no longer be called. +func (m ReadOnlyAddressableEndpointState) ForEachPrimaryEndpoint(f func(AddressEndpoint)) { + m.inner.mu.RLock() + defer m.inner.mu.RUnlock() + for _, ep := range m.inner.mu.primary { + f(ep) + } +} + +// ReadOnly returns a readonly reference to a. +func (a *AddressableEndpointState) ReadOnly() ReadOnlyAddressableEndpointState { + return ReadOnlyAddressableEndpointState{inner: a} +} + +func (a *AddressableEndpointState) releaseAddressState(addrState *addressState) { + a.mu.Lock() + defer a.mu.Unlock() + a.releaseAddressStateLocked(addrState) +} + +// releaseAddressState removes addrState from s's address state (primary and endpoints list). +// +// Preconditions: a.mu must be write locked. +func (a *AddressableEndpointState) releaseAddressStateLocked(addrState *addressState) { + oldPrimary := a.mu.primary + for i, s := range a.mu.primary { + if s == addrState { + a.mu.primary = append(a.mu.primary[:i], a.mu.primary[i+1:]...) + oldPrimary[len(oldPrimary)-1] = nil + break + } + } + delete(a.mu.endpoints, addrState.addr.Address) +} + +// AddAndAcquirePermanentAddress implements AddressableEndpoint. +func (a *AddressableEndpointState) AddAndAcquirePermanentAddress(addr tcpip.AddressWithPrefix, peb PrimaryEndpointBehavior, configType AddressConfigType, deprecated bool) (AddressEndpoint, *tcpip.Error) { + a.mu.Lock() + defer a.mu.Unlock() + ep, err := a.addAndAcquireAddressLocked(addr, peb, configType, deprecated, true /* permanent */) + // From https://golang.org/doc/faq#nil_error: + // + // Under the covers, interfaces are implemented as two elements, a type T and + // a value V. + // + // An interface value is nil only if the V and T are both unset, (T=nil, V is + // not set), In particular, a nil interface will always hold a nil type. If we + // store a nil pointer of type *int inside an interface value, the inner type + // will be *int regardless of the value of the pointer: (T=*int, V=nil). Such + // an interface value will therefore be non-nil even when the pointer value V + // inside is nil. + // + // Since addAndAcquireAddressLocked returns a nil value with a non-nil type, + // we need to explicitly return nil below if ep is (a typed) nil. + if ep == nil { + return nil, err + } + return ep, err +} + +// AddAndAcquireTemporaryAddress adds a temporary address. +// +// Returns tcpip.ErrDuplicateAddress if the address exists. +// +// The temporary address's endpoint is acquired and returned. +func (a *AddressableEndpointState) AddAndAcquireTemporaryAddress(addr tcpip.AddressWithPrefix, peb PrimaryEndpointBehavior) (AddressEndpoint, *tcpip.Error) { + a.mu.Lock() + defer a.mu.Unlock() + ep, err := a.addAndAcquireAddressLocked(addr, peb, AddressConfigStatic, false /* deprecated */, false /* permanent */) + // From https://golang.org/doc/faq#nil_error: + // + // Under the covers, interfaces are implemented as two elements, a type T and + // a value V. + // + // An interface value is nil only if the V and T are both unset, (T=nil, V is + // not set), In particular, a nil interface will always hold a nil type. If we + // store a nil pointer of type *int inside an interface value, the inner type + // will be *int regardless of the value of the pointer: (T=*int, V=nil). Such + // an interface value will therefore be non-nil even when the pointer value V + // inside is nil. + // + // Since addAndAcquireAddressLocked returns a nil value with a non-nil type, + // we need to explicitly return nil below if ep is (a typed) nil. + if ep == nil { + return nil, err + } + return ep, err +} + +// addAndAcquireAddressLocked adds, acquires and returns a permanent or +// temporary address. +// +// If the addressable endpoint already has the address in a non-permanent state, +// and addAndAcquireAddressLocked is adding a permanent address, that address is +// promoted in place and its properties set to the properties provided. If the +// address already exists in any other state, then tcpip.ErrDuplicateAddress is +// returned, regardless the kind of address that is being added. +// +// Precondition: a.mu must be write locked. +func (a *AddressableEndpointState) addAndAcquireAddressLocked(addr tcpip.AddressWithPrefix, peb PrimaryEndpointBehavior, configType AddressConfigType, deprecated, permanent bool) (*addressState, *tcpip.Error) { + // attemptAddToPrimary is false when the address is already in the primary + // address list. + attemptAddToPrimary := true + addrState, ok := a.mu.endpoints[addr.Address] + if ok { + if !permanent { + // We are adding a non-permanent address but the address exists. No need + // to go any further since we can only promote existing temporary/expired + // addresses to permanent. + return nil, tcpip.ErrDuplicateAddress + } + + addrState.mu.Lock() + if addrState.mu.kind.IsPermanent() { + addrState.mu.Unlock() + // We are adding a permanent address but a permanent address already + // exists. + return nil, tcpip.ErrDuplicateAddress + } + + if addrState.mu.refs == 0 { + panic(fmt.Sprintf("found an address that should have been released (ref count == 0); address = %s", addrState.addr)) + } + + // We now promote the address. + for i, s := range a.mu.primary { + if s == addrState { + switch peb { + case CanBePrimaryEndpoint: + // The address is already in the primary address list. + attemptAddToPrimary = false + case FirstPrimaryEndpoint: + if i == 0 { + // The address is already first in the primary address list. + attemptAddToPrimary = false + } else { + a.mu.primary = append(a.mu.primary[:i], a.mu.primary[i+1:]...) + } + case NeverPrimaryEndpoint: + a.mu.primary = append(a.mu.primary[:i], a.mu.primary[i+1:]...) + default: + panic(fmt.Sprintf("unrecognized primary endpoint behaviour = %d", peb)) + } + break + } + } + } + + if addrState == nil { + addrState = &addressState{ + addressableEndpointState: a, + addr: addr, + } + a.mu.endpoints[addr.Address] = addrState + addrState.mu.Lock() + // We never promote an address to temporary - it can only be added as such. + // If we are actaully adding a permanent address, it is promoted below. + addrState.mu.kind = Temporary + } + + // At this point we have an address we are either promoting from an expired or + // temporary address to permanent, promoting an expired address to temporary, + // or we are adding a new temporary or permanent address. + // + // The address MUST be write locked at this point. + defer addrState.mu.Unlock() + + if permanent { + if addrState.mu.kind.IsPermanent() { + panic(fmt.Sprintf("only non-permanent addresses should be promoted to permanent; address = %s", addrState.addr)) + } + + // Primary addresses are biased by 1. + addrState.mu.refs++ + addrState.mu.kind = Permanent + } + // Acquire the address before returning it. + addrState.mu.refs++ + addrState.mu.deprecated = deprecated + addrState.mu.configType = configType + + if attemptAddToPrimary { + switch peb { + case NeverPrimaryEndpoint: + case CanBePrimaryEndpoint: + a.mu.primary = append(a.mu.primary, addrState) + case FirstPrimaryEndpoint: + if cap(a.mu.primary) == len(a.mu.primary) { + a.mu.primary = append([]*addressState{addrState}, a.mu.primary...) + } else { + // Shift all the endpoints by 1 to make room for the new address at the + // front. We could have just created a new slice but this saves + // allocations when the slice has capacity for the new address. + primaryCount := len(a.mu.primary) + a.mu.primary = append(a.mu.primary, nil) + if n := copy(a.mu.primary[1:], a.mu.primary); n != primaryCount { + panic(fmt.Sprintf("copied %d elements; expected = %d elements", n, primaryCount)) + } + a.mu.primary[0] = addrState + } + default: + panic(fmt.Sprintf("unrecognized primary endpoint behaviour = %d", peb)) + } + } + + return addrState, nil +} + +// RemovePermanentAddress implements AddressableEndpoint. +func (a *AddressableEndpointState) RemovePermanentAddress(addr tcpip.Address) *tcpip.Error { + a.mu.Lock() + defer a.mu.Unlock() + + if _, ok := a.mu.groups[addr]; ok { + panic(fmt.Sprintf("group address = %s must be removed with LeaveGroup", addr)) + } + + return a.removePermanentAddressLocked(addr) +} + +// removePermanentAddressLocked is like RemovePermanentAddress but with locking +// requirements. +// +// Precondition: a.mu must be write locked. +func (a *AddressableEndpointState) removePermanentAddressLocked(addr tcpip.Address) *tcpip.Error { + addrState, ok := a.mu.endpoints[addr] + if !ok { + return tcpip.ErrBadLocalAddress + } + + return a.removePermanentEndpointLocked(addrState) +} + +// RemovePermanentEndpoint removes the passed endpoint if it is associated with +// a and permanent. +func (a *AddressableEndpointState) RemovePermanentEndpoint(ep AddressEndpoint) *tcpip.Error { + addrState, ok := ep.(*addressState) + if !ok || addrState.addressableEndpointState != a { + return tcpip.ErrInvalidEndpointState + } + + return a.removePermanentEndpointLocked(addrState) +} + +// removePermanentAddressLocked is like RemovePermanentAddress but with locking +// requirements. +// +// Precondition: a.mu must be write locked. +func (a *AddressableEndpointState) removePermanentEndpointLocked(addrState *addressState) *tcpip.Error { + if !addrState.GetKind().IsPermanent() { + return tcpip.ErrBadLocalAddress + } + + addrState.SetKind(PermanentExpired) + a.decAddressRefLocked(addrState) + return nil +} + +// decAddressRef decrements the address's reference count and releases it once +// the reference count hits 0. +func (a *AddressableEndpointState) decAddressRef(addrState *addressState) { + a.mu.Lock() + defer a.mu.Unlock() + a.decAddressRefLocked(addrState) +} + +// decAddressRefLocked is like decAddressRef but with locking requirements. +// +// Precondition: a.mu must be write locked. +func (a *AddressableEndpointState) decAddressRefLocked(addrState *addressState) { + addrState.mu.Lock() + defer addrState.mu.Unlock() + + if addrState.mu.refs == 0 { + panic(fmt.Sprintf("attempted to decrease ref count for AddressEndpoint w/ addr = %s when it is already released", addrState.addr)) + } + + addrState.mu.refs-- + + if addrState.mu.refs != 0 { + return + } + + // A non-expired permanent address must not have its reference count dropped + // to 0. + if addrState.mu.kind.IsPermanent() { + panic(fmt.Sprintf("permanent addresses should be removed through the AddressableEndpoint: addr = %s, kind = %d", addrState.addr, addrState.mu.kind)) + } + + a.releaseAddressStateLocked(addrState) +} + +// AcquireAssignedAddress implements AddressableEndpoint. +func (a *AddressableEndpointState) AcquireAssignedAddress(localAddr tcpip.Address, allowTemp bool, tempPEB PrimaryEndpointBehavior) AddressEndpoint { + a.mu.Lock() + defer a.mu.Unlock() + + if addrState, ok := a.mu.endpoints[localAddr]; ok { + if !addrState.IsAssigned(allowTemp) { + return nil + } + + if !addrState.IncRef() { + panic(fmt.Sprintf("failed to increase the reference count for address = %s", addrState.addr)) + } + + return addrState + } + + if !allowTemp { + return nil + } + + addr := localAddr.WithPrefix() + ep, err := a.addAndAcquireAddressLocked(addr, tempPEB, AddressConfigStatic, false /* deprecated */, false /* permanent */) + if err != nil { + // addAndAcquireAddressLocked only returns an error if the address is + // already assigned but we just checked above if the address exists so we + // expect no error. + panic(fmt.Sprintf("a.addAndAcquireAddressLocked(%s, %d, %d, false, false): %s", addr, tempPEB, AddressConfigStatic, err)) + } + // From https://golang.org/doc/faq#nil_error: + // + // Under the covers, interfaces are implemented as two elements, a type T and + // a value V. + // + // An interface value is nil only if the V and T are both unset, (T=nil, V is + // not set), In particular, a nil interface will always hold a nil type. If we + // store a nil pointer of type *int inside an interface value, the inner type + // will be *int regardless of the value of the pointer: (T=*int, V=nil). Such + // an interface value will therefore be non-nil even when the pointer value V + // inside is nil. + // + // Since addAndAcquireAddressLocked returns a nil value with a non-nil type, + // we need to explicitly return nil below if ep is (a typed) nil. + if ep == nil { + return nil + } + return ep +} + +// AcquirePrimaryAddress implements AddressableEndpoint. +func (a *AddressableEndpointState) AcquirePrimaryAddress(remoteAddr tcpip.Address, allowExpired bool) AddressEndpoint { + a.mu.RLock() + defer a.mu.RUnlock() + + var deprecatedEndpoint *addressState + for _, ep := range a.mu.primary { + if !ep.IsAssigned(allowExpired) { + continue + } + + if !ep.Deprecated() { + if ep.IncRef() { + // ep is not deprecated, so return it immediately. + // + // If we kept track of a deprecated endpoint, decrement its reference + // count since it was incremented when we decided to keep track of it. + if deprecatedEndpoint != nil { + a.decAddressRefLocked(deprecatedEndpoint) + deprecatedEndpoint = nil + } + + return ep + } + } else if deprecatedEndpoint == nil && ep.IncRef() { + // We prefer an endpoint that is not deprecated, but we keep track of + // ep in case a doesn't have any non-deprecated endpoints. + // + // If we end up finding a more preferred endpoint, ep's reference count + // will be decremented. + deprecatedEndpoint = ep + } + } + + // a doesn't have any valid non-deprecated endpoints, so return + // deprecatedEndpoint (which may be nil if a doesn't have any valid deprecated + // endpoints either). + if deprecatedEndpoint == nil { + return nil + } + return deprecatedEndpoint +} + +// PrimaryAddresses implements AddressableEndpoint. +func (a *AddressableEndpointState) PrimaryAddresses() []tcpip.AddressWithPrefix { + a.mu.RLock() + defer a.mu.RUnlock() + + var addrs []tcpip.AddressWithPrefix + for _, ep := range a.mu.primary { + // Don't include tentative, expired or temporary endpoints + // to avoid confusion and prevent the caller from using + // those. + switch ep.GetKind() { + case PermanentTentative, PermanentExpired, Temporary: + continue + } + + addrs = append(addrs, ep.AddressWithPrefix()) + } + + return addrs +} + +// PermanentAddresses implements AddressableEndpoint. +func (a *AddressableEndpointState) PermanentAddresses() []tcpip.AddressWithPrefix { + a.mu.RLock() + defer a.mu.RUnlock() + + var addrs []tcpip.AddressWithPrefix + for _, ep := range a.mu.endpoints { + if !ep.GetKind().IsPermanent() { + continue + } + + addrs = append(addrs, ep.AddressWithPrefix()) + } + + return addrs +} + +// JoinGroup implements GroupAddressableEndpoint. +func (a *AddressableEndpointState) JoinGroup(group tcpip.Address) (bool, *tcpip.Error) { + a.mu.Lock() + defer a.mu.Unlock() + + joins, ok := a.mu.groups[group] + if !ok { + ep, err := a.addAndAcquireAddressLocked(group.WithPrefix(), NeverPrimaryEndpoint, AddressConfigStatic, false /* deprecated */, true /* permanent */) + if err != nil { + return false, err + } + // We have no need for the address endpoint. + a.decAddressRefLocked(ep) + } + + a.mu.groups[group] = joins + 1 + return !ok, nil +} + +// LeaveGroup implements GroupAddressableEndpoint. +func (a *AddressableEndpointState) LeaveGroup(group tcpip.Address) (bool, *tcpip.Error) { + a.mu.Lock() + defer a.mu.Unlock() + + joins, ok := a.mu.groups[group] + if !ok { + return false, tcpip.ErrBadLocalAddress + } + + if joins == 1 { + a.removeGroupAddressLocked(group) + delete(a.mu.groups, group) + return true, nil + } + + a.mu.groups[group] = joins - 1 + return false, nil +} + +// IsInGroup implements GroupAddressableEndpoint. +func (a *AddressableEndpointState) IsInGroup(group tcpip.Address) bool { + a.mu.RLock() + defer a.mu.RUnlock() + _, ok := a.mu.groups[group] + return ok +} + +func (a *AddressableEndpointState) removeGroupAddressLocked(group tcpip.Address) { + if err := a.removePermanentAddressLocked(group); err != nil { + // removePermanentEndpointLocked would only return an error if group is + // not bound to the addressable endpoint, but we know it MUST be assigned + // since we have group in our map of groups. + panic(fmt.Sprintf("error removing group address = %s: %s", group, err)) + } +} + +// Cleanup forcefully leaves all groups and removes all permanent addresses. +func (a *AddressableEndpointState) Cleanup() { + a.mu.Lock() + defer a.mu.Unlock() + + for group := range a.mu.groups { + a.removeGroupAddressLocked(group) + } + a.mu.groups = make(map[tcpip.Address]uint32) + + for _, ep := range a.mu.endpoints { + // removePermanentEndpointLocked returns tcpip.ErrBadLocalAddress if ep is + // not a permanent address. + if err := a.removePermanentEndpointLocked(ep); err != nil && err != tcpip.ErrBadLocalAddress { + panic(fmt.Sprintf("unexpected error from removePermanentEndpointLocked(%s): %s", ep.addr, err)) + } + } +} + +var _ AddressEndpoint = (*addressState)(nil) + +// addressState holds state for an address. +type addressState struct { + addressableEndpointState *AddressableEndpointState + addr tcpip.AddressWithPrefix + + // Lock ordering (from outer to inner lock ordering): + // + // AddressableEndpointState.mu + // addressState.mu + mu struct { + sync.RWMutex + + refs uint32 + kind AddressKind + configType AddressConfigType + deprecated bool + } +} + +// NetworkEndpoint implements AddressEndpoint. +func (a *addressState) NetworkEndpoint() NetworkEndpoint { + return a.addressableEndpointState.networkEndpoint +} + +// AddressWithPrefix implements AddressEndpoint. +func (a *addressState) AddressWithPrefix() tcpip.AddressWithPrefix { + return a.addr +} + +// GetKind implements AddressEndpoint. +func (a *addressState) GetKind() AddressKind { + a.mu.RLock() + defer a.mu.RUnlock() + return a.mu.kind +} + +// SetKind implements AddressEndpoint. +func (a *addressState) SetKind(kind AddressKind) { + a.mu.Lock() + defer a.mu.Unlock() + a.mu.kind = kind +} + +// IsAssigned implements AddressEndpoint. +func (a *addressState) IsAssigned(allowExpired bool) bool { + if !a.addressableEndpointState.networkEndpoint.Enabled() { + return false + } + + switch a.GetKind() { + case PermanentTentative: + return false + case PermanentExpired: + return allowExpired + default: + return true + } +} + +// IncRef implements AddressEndpoint. +func (a *addressState) IncRef() bool { + a.mu.Lock() + defer a.mu.Unlock() + if a.mu.refs == 0 { + return false + } + + a.mu.refs++ + return true +} + +// DecRef implements AddressEndpoint. +func (a *addressState) DecRef() { + a.addressableEndpointState.decAddressRef(a) +} + +// ConfigType implements AddressEndpoint. +func (a *addressState) ConfigType() AddressConfigType { + a.mu.RLock() + defer a.mu.RUnlock() + return a.mu.configType +} + +// SetDeprecated implements AddressEndpoint. +func (a *addressState) SetDeprecated(d bool) { + a.mu.Lock() + defer a.mu.Unlock() + a.mu.deprecated = d +} + +// Deprecated implements AddressEndpoint. +func (a *addressState) Deprecated() bool { + a.mu.RLock() + defer a.mu.RUnlock() + return a.mu.deprecated +} diff --git a/pkg/tcpip/stack/addressable_endpoint_state_test.go b/pkg/tcpip/stack/addressable_endpoint_state_test.go new file mode 100644 index 000000000..de4e0d7b1 --- /dev/null +++ b/pkg/tcpip/stack/addressable_endpoint_state_test.go @@ -0,0 +1,72 @@ +// Copyright 2020 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package stack_test + +import ( + "testing" + + "gvisor.dev/gvisor/pkg/tcpip" + "gvisor.dev/gvisor/pkg/tcpip/stack" +) + +// TestAddressableEndpointStateCleanup tests that cleaning up an addressable +// endpoint state removes permanent addresses and leaves groups. +func TestAddressableEndpointStateCleanup(t *testing.T) { + var s stack.AddressableEndpointState + s.Init(&fakeNetworkEndpoint{}) + + addr := tcpip.AddressWithPrefix{ + Address: "\x01", + PrefixLen: 8, + } + + { + ep, err := s.AddAndAcquirePermanentAddress(addr, stack.NeverPrimaryEndpoint, stack.AddressConfigStatic, false /* deprecated */) + if err != nil { + t.Fatalf("s.AddAndAcquirePermanentAddress(%s, %d, %d, false): %s", addr, stack.NeverPrimaryEndpoint, stack.AddressConfigStatic, err) + } + // We don't need the address endpoint. + ep.DecRef() + } + { + ep := s.AcquireAssignedAddress(addr.Address, false /* allowTemp */, stack.NeverPrimaryEndpoint) + if ep == nil { + t.Fatalf("got s.AcquireAssignedAddress(%s) = nil, want = non-nil", addr.Address) + } + ep.DecRef() + } + + group := tcpip.Address("\x02") + if added, err := s.JoinGroup(group); err != nil { + t.Fatalf("s.JoinGroup(%s): %s", group, err) + } else if !added { + t.Fatalf("got s.JoinGroup(%s) = false, want = true", group) + } + if !s.IsInGroup(group) { + t.Fatalf("got s.IsInGroup(%s) = false, want = true", group) + } + + s.Cleanup() + { + ep := s.AcquireAssignedAddress(addr.Address, false /* allowTemp */, stack.NeverPrimaryEndpoint) + if ep != nil { + ep.DecRef() + t.Fatalf("got s.AcquireAssignedAddress(%s) = %s, want = nil", addr.Address, ep.AddressWithPrefix()) + } + } + if s.IsInGroup(group) { + t.Fatalf("got s.IsInGroup(%s) = true, want = false", group) + } +} diff --git a/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go b/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go deleted file mode 100644 index d199ded6a..000000000 --- a/pkg/tcpip/stack/dhcpv6configurationfromndpra_string.go +++ /dev/null @@ -1,40 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Code generated by "stringer -type DHCPv6ConfigurationFromNDPRA"; DO NOT EDIT. - -package stack - -import "strconv" - -func _() { - // An "invalid array index" compiler error signifies that the constant values have changed. - // Re-run the stringer command to generate them again. - var x [1]struct{} - _ = x[DHCPv6NoConfiguration-1] - _ = x[DHCPv6ManagedAddress-2] - _ = x[DHCPv6OtherConfigurations-3] -} - -const _DHCPv6ConfigurationFromNDPRA_name = "DHCPv6NoConfigurationDHCPv6ManagedAddressDHCPv6OtherConfigurations" - -var _DHCPv6ConfigurationFromNDPRA_index = [...]uint8{0, 21, 41, 66} - -func (i DHCPv6ConfigurationFromNDPRA) String() string { - i -= 1 - if i < 0 || i >= DHCPv6ConfigurationFromNDPRA(len(_DHCPv6ConfigurationFromNDPRA_index)-1) { - return "DHCPv6ConfigurationFromNDPRA(" + strconv.FormatInt(int64(i+1), 10) + ")" - } - return _DHCPv6ConfigurationFromNDPRA_name[_DHCPv6ConfigurationFromNDPRA_index[i]:_DHCPv6ConfigurationFromNDPRA_index[i+1]] -} diff --git a/pkg/tcpip/stack/forwarder_test.go b/pkg/tcpip/stack/forwarder_test.go index 8d18f3c8c..572a2c3b6 100644 --- a/pkg/tcpip/stack/forwarder_test.go +++ b/pkg/tcpip/stack/forwarder_test.go @@ -20,6 +20,7 @@ import ( "testing" "time" + "gvisor.dev/gvisor/pkg/sync" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/buffer" "gvisor.dev/gvisor/pkg/tcpip/header" @@ -45,6 +46,8 @@ const ( // use the first three: destination address, source address, and transport // protocol. They're all one byte fields to simplify parsing. type fwdTestNetworkEndpoint struct { + AddressableEndpointState + nicID tcpip.NICID proto *fwdTestNetworkProtocol dispatcher TransportDispatcher @@ -53,6 +56,16 @@ type fwdTestNetworkEndpoint struct { var _ NetworkEndpoint = (*fwdTestNetworkEndpoint)(nil) +func (*fwdTestNetworkEndpoint) Enable() *tcpip.Error { + return nil +} + +func (*fwdTestNetworkEndpoint) Enabled() bool { + return true +} + +func (*fwdTestNetworkEndpoint) Disable() {} + func (f *fwdTestNetworkEndpoint) MTU() uint32 { return f.ep.MTU() - uint32(f.MaxHeaderLength()) } @@ -106,7 +119,9 @@ func (*fwdTestNetworkEndpoint) WriteHeaderIncludedPacket(r *Route, pkt *PacketBu return tcpip.ErrNotSupported } -func (*fwdTestNetworkEndpoint) Close() {} +func (f *fwdTestNetworkEndpoint) Close() { + f.AddressableEndpointState.Cleanup() +} // fwdTestNetworkProtocol is a network-layer protocol that implements Address // resolution. @@ -116,6 +131,11 @@ type fwdTestNetworkProtocol struct { addrResolveDelay time.Duration onLinkAddressResolved func(cache *linkAddrCache, neigh *neighborCache, addr tcpip.Address, _ tcpip.LinkAddress) onResolveStaticAddress func(tcpip.Address) (tcpip.LinkAddress, bool) + + mu struct { + sync.RWMutex + forwarding bool + } } var _ NetworkProtocol = (*fwdTestNetworkProtocol)(nil) @@ -145,13 +165,15 @@ func (*fwdTestNetworkProtocol) Parse(pkt *PacketBuffer) (tcpip.TransportProtocol return tcpip.TransportProtocolNumber(netHeader[protocolNumberOffset]), true, true } -func (f *fwdTestNetworkProtocol) NewEndpoint(nicID tcpip.NICID, _ LinkAddressCache, _ NUDHandler, dispatcher TransportDispatcher, ep LinkEndpoint, _ *Stack) NetworkEndpoint { - return &fwdTestNetworkEndpoint{ - nicID: nicID, +func (f *fwdTestNetworkProtocol) NewEndpoint(nic NetworkInterface, _ LinkAddressCache, _ NUDHandler, dispatcher TransportDispatcher, ep LinkEndpoint, _ *Stack) NetworkEndpoint { + e := &fwdTestNetworkEndpoint{ + nicID: nic.ID(), proto: f, dispatcher: dispatcher, ep: ep, } + e.AddressableEndpointState.Init(e) + return e } func (*fwdTestNetworkProtocol) SetOption(tcpip.SettableNetworkProtocolOption) *tcpip.Error { @@ -186,6 +208,21 @@ func (*fwdTestNetworkProtocol) LinkAddressProtocol() tcpip.NetworkProtocolNumber return fwdTestNetNumber } +// Forwarding implements stack.ForwardingNetworkProtocol. +func (f *fwdTestNetworkProtocol) Forwarding() bool { + f.mu.RLock() + defer f.mu.RUnlock() + return f.mu.forwarding + +} + +// SetForwarding implements stack.ForwardingNetworkProtocol. +func (f *fwdTestNetworkProtocol) SetForwarding(v bool) { + f.mu.Lock() + defer f.mu.Unlock() + f.mu.forwarding = v +} + // fwdTestPacketInfo holds all the information about an outbound packet. type fwdTestPacketInfo struct { RemoteLinkAddress tcpip.LinkAddress diff --git a/pkg/tcpip/stack/ndp.go b/pkg/tcpip/stack/ndp.go deleted file mode 100644 index 97ca00d16..000000000 --- a/pkg/tcpip/stack/ndp.go +++ /dev/null @@ -1,1973 +0,0 @@ -// Copyright 2019 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package stack - -import ( - "fmt" - "log" - "math/rand" - "time" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -const ( - // defaultDupAddrDetectTransmits is the default number of NDP Neighbor - // Solicitation messages to send when doing Duplicate Address Detection - // for a tentative address. - // - // Default = 1 (from RFC 4862 section 5.1) - defaultDupAddrDetectTransmits = 1 - - // defaultMaxRtrSolicitations is the default number of Router - // Solicitation messages to send when a NIC becomes enabled. - // - // Default = 3 (from RFC 4861 section 10). - defaultMaxRtrSolicitations = 3 - - // defaultRtrSolicitationInterval is the default amount of time between - // sending Router Solicitation messages. - // - // Default = 4s (from 4861 section 10). - defaultRtrSolicitationInterval = 4 * time.Second - - // defaultMaxRtrSolicitationDelay is the default maximum amount of time - // to wait before sending the first Router Solicitation message. - // - // Default = 1s (from 4861 section 10). - defaultMaxRtrSolicitationDelay = time.Second - - // defaultHandleRAs is the default configuration for whether or not to - // handle incoming Router Advertisements as a host. - defaultHandleRAs = true - - // defaultDiscoverDefaultRouters is the default configuration for - // whether or not to discover default routers from incoming Router - // Advertisements, as a host. - defaultDiscoverDefaultRouters = true - - // defaultDiscoverOnLinkPrefixes is the default configuration for - // whether or not to discover on-link prefixes from incoming Router - // Advertisements' Prefix Information option, as a host. - defaultDiscoverOnLinkPrefixes = true - - // defaultAutoGenGlobalAddresses is the default configuration for - // whether or not to generate global IPv6 addresses in response to - // receiving a new Prefix Information option with its Autonomous - // Address AutoConfiguration flag set, as a host. - // - // Default = true. - defaultAutoGenGlobalAddresses = true - - // minimumRtrSolicitationInterval is the minimum amount of time to wait - // between sending Router Solicitation messages. This limit is imposed - // to make sure that Router Solicitation messages are not sent all at - // once, defeating the purpose of sending the initial few messages. - minimumRtrSolicitationInterval = 500 * time.Millisecond - - // minimumMaxRtrSolicitationDelay is the minimum amount of time to wait - // before sending the first Router Solicitation message. It is 0 because - // we cannot have a negative delay. - minimumMaxRtrSolicitationDelay = 0 - - // MaxDiscoveredDefaultRouters is the maximum number of discovered - // default routers. The stack should stop discovering new routers after - // discovering MaxDiscoveredDefaultRouters routers. - // - // This value MUST be at minimum 2 as per RFC 4861 section 6.3.4, and - // SHOULD be more. - MaxDiscoveredDefaultRouters = 10 - - // MaxDiscoveredOnLinkPrefixes is the maximum number of discovered - // on-link prefixes. The stack should stop discovering new on-link - // prefixes after discovering MaxDiscoveredOnLinkPrefixes on-link - // prefixes. - MaxDiscoveredOnLinkPrefixes = 10 - - // validPrefixLenForAutoGen is the expected prefix length that an - // address can be generated for. Must be 64 bits as the interface - // identifier (IID) is 64 bits and an IPv6 address is 128 bits, so - // 128 - 64 = 64. - validPrefixLenForAutoGen = 64 - - // defaultAutoGenTempGlobalAddresses is the default configuration for whether - // or not to generate temporary SLAAC addresses. - defaultAutoGenTempGlobalAddresses = true - - // defaultMaxTempAddrValidLifetime is the default maximum valid lifetime - // for temporary SLAAC addresses generated as part of RFC 4941. - // - // Default = 7 days (from RFC 4941 section 5). - defaultMaxTempAddrValidLifetime = 7 * 24 * time.Hour - - // defaultMaxTempAddrPreferredLifetime is the default preferred lifetime - // for temporary SLAAC addresses generated as part of RFC 4941. - // - // Default = 1 day (from RFC 4941 section 5). - defaultMaxTempAddrPreferredLifetime = 24 * time.Hour - - // defaultRegenAdvanceDuration is the default duration before the deprecation - // of a temporary address when a new address will be generated. - // - // Default = 5s (from RFC 4941 section 5). - defaultRegenAdvanceDuration = 5 * time.Second - - // minRegenAdvanceDuration is the minimum duration before the deprecation - // of a temporary address when a new address will be generated. - minRegenAdvanceDuration = time.Duration(0) - - // maxSLAACAddrLocalRegenAttempts is the maximum number of times to attempt - // SLAAC address regenerations in response to a NIC-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). - MaxDesyncFactor = 10 * time.Minute - - // 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 will be preferred for at - // least 1hr if the SLAAC prefix is valid for at least that time. - MinMaxTempAddrPreferredLifetime = defaultRegenAdvanceDuration + MaxDesyncFactor + time.Hour - - // 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 will be valid for at least - // 2hrs if the SLAAC prefix is valid for at least that time. - MinMaxTempAddrValidLifetime = 2 * time.Hour -) - -// DHCPv6ConfigurationFromNDPRA is a configuration available via DHCPv6 that an -// NDP Router Advertisement informed the Stack about. -type DHCPv6ConfigurationFromNDPRA int - -const ( - _ DHCPv6ConfigurationFromNDPRA = iota - - // DHCPv6NoConfiguration indicates that no configurations are available via - // DHCPv6. - DHCPv6NoConfiguration - - // DHCPv6ManagedAddress indicates that addresses are available via DHCPv6. - // - // DHCPv6ManagedAddress also implies DHCPv6OtherConfigurations because DHCPv6 - // will return all available configuration information. - DHCPv6ManagedAddress - - // DHCPv6OtherConfigurations indicates that other configuration information is - // available via DHCPv6. - // - // Other configurations are configurations other than addresses. Examples of - // other configurations are recursive DNS server list, DNS search lists and - // default gateway. - DHCPv6OtherConfigurations -) - -// NDPDispatcher is the interface integrators of netstack must implement to -// receive and handle NDP related events. -type NDPDispatcher interface { - // OnDuplicateAddressDetectionStatus will be called when the DAD process - // for an address (addr) on a NIC (with ID nicID) completes. resolved - // will be set to true if DAD completed successfully (no duplicate addr - // detected); false otherwise (addr was detected to be a duplicate on - // the link the NIC is a part of, or it was stopped for some other - // reason, such as the address being removed). If an error occured - // during DAD, err will be set and resolved must be ignored. - // - // This function is not permitted to block indefinitely. This function - // is also not permitted to call into the stack. - OnDuplicateAddressDetectionStatus(nicID tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) - - // OnDefaultRouterDiscovered will be called when a new default router is - // discovered. Implementations must return true if the newly discovered - // router should be remembered. - // - // This function is not permitted to block indefinitely. This function - // is also not permitted to call into the stack. - OnDefaultRouterDiscovered(nicID tcpip.NICID, addr tcpip.Address) bool - - // OnDefaultRouterInvalidated will be called when a discovered default - // router that was remembered is invalidated. - // - // This function is not permitted to block indefinitely. This function - // is also not permitted to call into the stack. - OnDefaultRouterInvalidated(nicID tcpip.NICID, addr tcpip.Address) - - // OnOnLinkPrefixDiscovered will be called when a new on-link prefix is - // discovered. Implementations must return true if the newly discovered - // on-link prefix should be remembered. - // - // This function is not permitted to block indefinitely. This function - // is also not permitted to call into the stack. - OnOnLinkPrefixDiscovered(nicID tcpip.NICID, prefix tcpip.Subnet) bool - - // OnOnLinkPrefixInvalidated will be called when a discovered on-link - // prefix that was remembered is invalidated. - // - // This function is not permitted to block indefinitely. This function - // is also not permitted to call into the stack. - OnOnLinkPrefixInvalidated(nicID tcpip.NICID, prefix tcpip.Subnet) - - // OnAutoGenAddress will be called when a new prefix with its - // autonomous address-configuration flag set has been received and SLAAC - // has been performed. Implementations may prevent the stack from - // assigning the address to the NIC by returning false. - // - // This function is not permitted to block indefinitely. It must not - // call functions on the stack itself. - OnAutoGenAddress(tcpip.NICID, tcpip.AddressWithPrefix) bool - - // OnAutoGenAddressDeprecated will be called when an auto-generated - // address (as part of SLAAC) has been deprecated, but is still - // considered valid. Note, if an address is invalidated at the same - // time it is deprecated, the deprecation event MAY be omitted. - // - // This function is not permitted to block indefinitely. It must not - // call functions on the stack itself. - OnAutoGenAddressDeprecated(tcpip.NICID, tcpip.AddressWithPrefix) - - // OnAutoGenAddressInvalidated will be called when an auto-generated - // address (as part of SLAAC) has been invalidated. - // - // This function is not permitted to block indefinitely. It must not - // call functions on the stack itself. - OnAutoGenAddressInvalidated(tcpip.NICID, tcpip.AddressWithPrefix) - - // OnRecursiveDNSServerOption will be called when an NDP option with - // recursive DNS servers has been received. Note, addrs may contain - // link-local addresses. - // - // It is up to the caller to use the DNS Servers only for their valid - // lifetime. OnRecursiveDNSServerOption may be called for new or - // already known DNS servers. If called with known DNS servers, their - // valid lifetimes must be refreshed to lifetime (it may be increased, - // decreased, or completely invalidated when lifetime = 0). - // - // This function is not permitted to block indefinitely. It must not - // call functions on the stack itself. - OnRecursiveDNSServerOption(nicID tcpip.NICID, addrs []tcpip.Address, lifetime time.Duration) - - // OnDNSSearchListOption will be called when an NDP option with a DNS - // search list has been received. - // - // It is up to the caller to use the domain names in the search list - // for only their valid lifetime. OnDNSSearchListOption may be called - // with new or already known domain names. If called with known domain - // names, their valid lifetimes must be refreshed to lifetime (it may - // be increased, decreased or completely invalidated when lifetime = 0. - OnDNSSearchListOption(nicID tcpip.NICID, domainNames []string, lifetime time.Duration) - - // OnDHCPv6Configuration will be called with an updated configuration that is - // available via DHCPv6 for a specified NIC. - // - // This function is not permitted to block indefinitely. It must not - // call functions on the stack itself. - OnDHCPv6Configuration(tcpip.NICID, DHCPv6ConfigurationFromNDPRA) -} - -// NDPConfigurations is the NDP configurations for the netstack. -type NDPConfigurations struct { - // The number of Neighbor Solicitation messages to send when doing - // Duplicate Address Detection for a tentative address. - // - // Note, a value of zero effectively disables DAD. - DupAddrDetectTransmits uint8 - - // The amount of time to wait between sending Neighbor solicitation - // messages. - // - // Must be greater than or equal to 1ms. - RetransmitTimer time.Duration - - // The number of Router Solicitation messages to send when the NIC - // becomes enabled. - MaxRtrSolicitations uint8 - - // The amount of time between transmitting Router Solicitation messages. - // - // Must be greater than or equal to 0.5s. - RtrSolicitationInterval time.Duration - - // The maximum amount of time before transmitting the first Router - // Solicitation message. - // - // Must be greater than or equal to 0s. - MaxRtrSolicitationDelay time.Duration - - // HandleRAs determines whether or not Router Advertisements will be - // processed. - HandleRAs bool - - // DiscoverDefaultRouters determines whether or not default routers will - // be discovered from Router Advertisements. This configuration is - // ignored if HandleRAs is false. - DiscoverDefaultRouters bool - - // DiscoverOnLinkPrefixes determines whether or not on-link prefixes - // will be discovered from Router Advertisements' Prefix Information - // option. This configuration is ignored if HandleRAs is false. - DiscoverOnLinkPrefixes bool - - // AutoGenGlobalAddresses determines whether or not global IPv6 - // addresses will be generated for a NIC in response to receiving a new - // Prefix Information option with its Autonomous Address - // AutoConfiguration flag set, as a host, as per RFC 4862 (SLAAC). - // - // Note, if an address was already generated for some unique prefix, as - // part of SLAAC, this option does not affect whether or not the - // lifetime(s) of the generated address changes; this option only - // affects the generation of new addresses as part of SLAAC. - AutoGenGlobalAddresses bool - - // AutoGenAddressConflictRetries determines how many times to attempt to retry - // generation of a permanent auto-generated address in response to DAD - // conflicts. - // - // If the method used to generate the address does not support creating - // alternative addresses (e.g. IIDs based on the modified EUI64 of a NIC's - // MAC address), then no attempt will be made to resolve the conflict. - AutoGenAddressConflictRetries uint8 - - // AutoGenTempGlobalAddresses determines whether or not temporary SLAAC - // addresses will be generated for a NIC as part of SLAAC privacy extensions, - // RFC 4941. - // - // Ignored if AutoGenGlobalAddresses is false. - AutoGenTempGlobalAddresses bool - - // MaxTempAddrValidLifetime is the maximum valid lifetime for temporary - // SLAAC addresses. - MaxTempAddrValidLifetime time.Duration - - // MaxTempAddrPreferredLifetime is the maximum preferred lifetime for - // temporary SLAAC addresses. - MaxTempAddrPreferredLifetime time.Duration - - // RegenAdvanceDuration is the duration before the deprecation of a temporary - // address when a new address will be generated. - RegenAdvanceDuration time.Duration -} - -// DefaultNDPConfigurations returns an NDPConfigurations populated with -// default values. -func DefaultNDPConfigurations() NDPConfigurations { - return NDPConfigurations{ - DupAddrDetectTransmits: defaultDupAddrDetectTransmits, - RetransmitTimer: defaultRetransmitTimer, - MaxRtrSolicitations: defaultMaxRtrSolicitations, - RtrSolicitationInterval: defaultRtrSolicitationInterval, - MaxRtrSolicitationDelay: defaultMaxRtrSolicitationDelay, - HandleRAs: defaultHandleRAs, - DiscoverDefaultRouters: defaultDiscoverDefaultRouters, - DiscoverOnLinkPrefixes: defaultDiscoverOnLinkPrefixes, - AutoGenGlobalAddresses: defaultAutoGenGlobalAddresses, - AutoGenTempGlobalAddresses: defaultAutoGenTempGlobalAddresses, - MaxTempAddrValidLifetime: defaultMaxTempAddrValidLifetime, - MaxTempAddrPreferredLifetime: defaultMaxTempAddrPreferredLifetime, - RegenAdvanceDuration: defaultRegenAdvanceDuration, - } -} - -// validate modifies an NDPConfigurations with valid values. If invalid values -// are present in c, the corresponding default values will be used instead. -func (c *NDPConfigurations) validate() { - if c.RetransmitTimer < minimumRetransmitTimer { - c.RetransmitTimer = defaultRetransmitTimer - } - - if c.RtrSolicitationInterval < minimumRtrSolicitationInterval { - c.RtrSolicitationInterval = defaultRtrSolicitationInterval - } - - if c.MaxRtrSolicitationDelay < minimumMaxRtrSolicitationDelay { - c.MaxRtrSolicitationDelay = defaultMaxRtrSolicitationDelay - } - - if c.MaxTempAddrValidLifetime < MinMaxTempAddrValidLifetime { - c.MaxTempAddrValidLifetime = MinMaxTempAddrValidLifetime - } - - if c.MaxTempAddrPreferredLifetime < MinMaxTempAddrPreferredLifetime || c.MaxTempAddrPreferredLifetime > c.MaxTempAddrValidLifetime { - c.MaxTempAddrPreferredLifetime = MinMaxTempAddrPreferredLifetime - } - - if c.RegenAdvanceDuration < minRegenAdvanceDuration { - c.RegenAdvanceDuration = minRegenAdvanceDuration - } -} - -// ndpState is the per-interface NDP state. -type ndpState struct { - // The NIC this ndpState is for. - nic *NIC - - // configs is the per-interface NDP configurations. - configs NDPConfigurations - - // The DAD state to send the next NS message, or resolve the address. - dad map[tcpip.Address]dadState - - // The default routers discovered through Router Advertisements. - defaultRouters map[tcpip.Address]defaultRouterState - - rtrSolicit struct { - // The timer used to send the next router solicitation message. - timer tcpip.Timer - - // Used to let the Router Solicitation timer know that it has been stopped. - // - // Must only be read from or written to while protected by the lock of - // the NIC this ndpState is associated with. MUST be set when the timer is - // set. - done *bool - } - - // The on-link prefixes discovered through Router Advertisements' Prefix - // Information option. - onLinkPrefixes map[tcpip.Subnet]onLinkPrefixState - - // The SLAAC prefixes discovered through Router Advertisements' Prefix - // Information option. - slaacPrefixes map[tcpip.Subnet]slaacPrefixState - - // The last learned DHCPv6 configuration from an NDP RA. - dhcpv6Configuration DHCPv6ConfigurationFromNDPRA - - // temporaryIIDHistory is the history value used to generate a new temporary - // IID. - temporaryIIDHistory [header.IIDSize]byte - - // temporaryAddressDesyncFactor is the preferred lifetime's desync factor for - // temporary SLAAC addresses. - temporaryAddressDesyncFactor time.Duration -} - -// dadState holds the Duplicate Address Detection timer and channel to signal -// to the DAD goroutine that DAD should stop. -type dadState struct { - // The DAD timer to send the next NS message, or resolve the address. - timer tcpip.Timer - - // Used to let the DAD timer know that it has been stopped. - // - // Must only be read from or written to while protected by the lock of - // the NIC this dadState is associated with. - done *bool -} - -// defaultRouterState holds data associated with a default router discovered by -// a Router Advertisement (RA). -type defaultRouterState struct { - // Job to invalidate the default router. - // - // Must not be nil. - invalidationJob *tcpip.Job -} - -// onLinkPrefixState holds data associated with an on-link prefix discovered by -// a Router Advertisement's Prefix Information option (PI) when the NDP -// configurations was configured to do so. -type onLinkPrefixState struct { - // Job to invalidate the on-link prefix. - // - // Must not be nil. - invalidationJob *tcpip.Job -} - -// tempSLAACAddrState holds state associated with a temporary SLAAC address. -type tempSLAACAddrState struct { - // Job to deprecate the temporary SLAAC address. - // - // Must not be nil. - deprecationJob *tcpip.Job - - // Job to invalidate the temporary SLAAC address. - // - // Must not be nil. - invalidationJob *tcpip.Job - - // Job to regenerate the temporary SLAAC address. - // - // Must not be nil. - regenJob *tcpip.Job - - createdAt time.Time - - // The address's endpoint. - // - // Must not be nil. - ref *referencedNetworkEndpoint - - // Has a new temporary SLAAC address already been regenerated? - regenerated bool -} - -// slaacPrefixState holds state associated with a SLAAC prefix. -type slaacPrefixState struct { - // Job to deprecate the prefix. - // - // Must not be nil. - deprecationJob *tcpip.Job - - // Job to invalidate the prefix. - // - // Must not be nil. - invalidationJob *tcpip.Job - - // Nonzero only when the address is not valid forever. - validUntil time.Time - - // Nonzero only when the address is not preferred forever. - preferredUntil time.Time - - // State associated with the stable address generated for the prefix. - stableAddr struct { - // The address's endpoint. - // - // May only be nil when the address is being (re-)generated. Otherwise, - // must not be nil as all SLAAC prefixes must have a stable address. - ref *referencedNetworkEndpoint - - // The number of times an address has been generated locally where the NIC - // already had the generated address. - localGenerationFailures uint8 - } - - // The temporary (short-lived) addresses generated for the SLAAC prefix. - tempAddrs map[tcpip.Address]tempSLAACAddrState - - // The next two fields are used by both stable and temporary addresses - // generated for a SLAAC prefix. This is safe as only 1 address will be - // in the generation and DAD process at any time. That is, no two addresses - // will be generated at the same time for a given SLAAC prefix. - - // The number of times an address has been generated and added to the NIC. - // - // Addresses may be regenerated in reseponse to a DAD conflicts. - generationAttempts uint8 - - // The maximum number of times to attempt regeneration of a SLAAC address - // in response to DAD conflicts. - maxGenerationAttempts uint8 -} - -// startDuplicateAddressDetection performs Duplicate Address Detection. -// -// This function must only be called by IPv6 addresses that are currently -// tentative. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) startDuplicateAddressDetection(addr tcpip.Address, ref *referencedNetworkEndpoint) *tcpip.Error { - // addr must be a valid unicast IPv6 address. - if !header.IsV6UnicastAddress(addr) { - return tcpip.ErrAddressFamilyNotSupported - } - - if ref.getKind() != permanentTentative { - // The endpoint should be marked as tentative since we are starting DAD. - panic(fmt.Sprintf("ndpdad: addr %s is not tentative on NIC(%d)", addr, ndp.nic.ID())) - } - - // Should not attempt to perform DAD on an address that is currently in the - // DAD process. - if _, ok := ndp.dad[addr]; ok { - // Should never happen because we should only ever call this function for - // newly created addresses. If we attemped to "add" an address that already - // existed, we would get an error since we attempted to add a duplicate - // address, or its reference count would have been increased without doing - // the work that would have been done for an address that was brand new. - // See NIC.addAddressLocked. - panic(fmt.Sprintf("ndpdad: already performing DAD for addr %s on NIC(%d)", addr, ndp.nic.ID())) - } - - remaining := ndp.configs.DupAddrDetectTransmits - if remaining == 0 { - ref.setKind(permanent) - - // Consider DAD to have resolved even if no DAD messages were actually - // transmitted. - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnDuplicateAddressDetectionStatus(ndp.nic.ID(), addr, true, nil) - } - - return nil - } - - var done bool - var timer tcpip.Timer - // We initially start a timer to fire immediately because some of the DAD work - // cannot be done while holding the NIC's lock. This is effectively the same - // as starting a goroutine but we use a timer that fires immediately so we can - // reset it for the next DAD iteration. - timer = ndp.nic.stack.Clock().AfterFunc(0, func() { - ndp.nic.mu.Lock() - defer ndp.nic.mu.Unlock() - - if done { - // If we reach this point, it means that the DAD timer fired after - // another goroutine already obtained the NIC lock and stopped DAD - // before this function obtained the NIC lock. Simply return here and do - // nothing further. - return - } - - if ref.getKind() != permanentTentative { - // The endpoint should still be marked as tentative since we are still - // performing DAD on it. - panic(fmt.Sprintf("ndpdad: addr %s is no longer tentative on NIC(%d)", addr, ndp.nic.ID())) - } - - dadDone := remaining == 0 - - var err *tcpip.Error - if !dadDone { - // Use the unspecified address as the source address when performing DAD. - ref := ndp.nic.getRefOrCreateTempLocked(header.IPv6ProtocolNumber, header.IPv6Any, NeverPrimaryEndpoint) - - // Do not hold the lock when sending packets which may be a long running - // task or may block link address resolution. We know this is safe - // because immediately after obtaining the lock again, we check if DAD - // has been stopped before doing any work with the NIC. Note, DAD would be - // stopped if the NIC was disabled or removed, or if the address was - // removed. - ndp.nic.mu.Unlock() - err = ndp.sendDADPacket(addr, ref) - ndp.nic.mu.Lock() - } - - if done { - // If we reach this point, it means that DAD was stopped after we released - // the NIC's read lock and before we obtained the write lock. - return - } - - if dadDone { - // DAD has resolved. - ref.setKind(permanent) - } else if err == nil { - // DAD is not done and we had no errors when sending the last NDP NS, - // schedule the next DAD timer. - remaining-- - timer.Reset(ndp.nic.stack.ndpConfigs.RetransmitTimer) - return - } - - // At this point we know that either DAD is done or we hit an error sending - // the last NDP NS. Either way, clean up addr's DAD state and let the - // integrator know DAD has completed. - delete(ndp.dad, addr) - - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnDuplicateAddressDetectionStatus(ndp.nic.ID(), addr, dadDone, err) - } - - // If DAD resolved for a stable SLAAC address, attempt generation of a - // temporary SLAAC address. - if dadDone && ref.configType == slaac { - // Reset the generation attempts counter as we are starting the generation - // of a new address for the SLAAC prefix. - ndp.regenerateTempSLAACAddr(ref.addrWithPrefix().Subnet(), true /* resetGenAttempts */) - } - }) - - ndp.dad[addr] = dadState{ - timer: timer, - done: &done, - } - - return nil -} - -// sendDADPacket sends a NS message to see if any nodes on ndp's NIC's link owns -// addr. -// -// addr must be a tentative IPv6 address on ndp's NIC. -// -// The NIC ndp belongs to MUST NOT be locked. -func (ndp *ndpState) sendDADPacket(addr tcpip.Address, ref *referencedNetworkEndpoint) *tcpip.Error { - snmc := header.SolicitedNodeAddr(addr) - - r := makeRoute(header.IPv6ProtocolNumber, ref.address(), snmc, ndp.nic.linkEP.LinkAddress(), ref, false, false) - defer r.Release() - - // Route should resolve immediately since snmc is a multicast address so a - // remote link address can be calculated without a resolution process. - if c, err := r.Resolve(nil); err != nil { - // Do not consider the NIC being unknown or disabled as a fatal error. - // Since this method is required to be called when the NIC is not locked, - // the NIC could have been disabled or removed by another goroutine. - if err == tcpip.ErrUnknownNICID || err != tcpip.ErrInvalidEndpointState { - return err - } - - panic(fmt.Sprintf("ndp: error when resolving route to send NDP NS for DAD (%s -> %s on NIC(%d)): %s", header.IPv6Any, snmc, ndp.nic.ID(), err)) - } else if c != nil { - panic(fmt.Sprintf("ndp: route resolution not immediate for route to send NDP NS for DAD (%s -> %s on NIC(%d))", header.IPv6Any, snmc, ndp.nic.ID())) - } - - icmpData := header.ICMPv6(buffer.NewView(header.ICMPv6NeighborSolicitMinimumSize)) - icmpData.SetType(header.ICMPv6NeighborSolicit) - ns := header.NDPNeighborSolicit(icmpData.NDPPayload()) - ns.SetTargetAddress(addr) - icmpData.SetChecksum(header.ICMPv6Checksum(icmpData, r.LocalAddress, r.RemoteAddress, buffer.VectorisedView{})) - - pkt := NewPacketBuffer(PacketBufferOptions{ - ReserveHeaderBytes: int(r.MaxHeaderLength()), - Data: buffer.View(icmpData).ToVectorisedView(), - }) - - sent := r.Stats().ICMP.V6PacketsSent - if err := r.WritePacket(nil, - NetworkHeaderParams{ - Protocol: header.ICMPv6ProtocolNumber, - TTL: header.NDPHopLimit, - TOS: DefaultTOS, - }, pkt, - ); err != nil { - sent.Dropped.Increment() - return err - } - sent.NeighborSolicit.Increment() - - return nil -} - -// stopDuplicateAddressDetection ends a running Duplicate Address Detection -// process. Note, this may leave the DAD process for a tentative address in -// such a state forever, unless some other external event resolves the DAD -// process (receiving an NA from the true owner of addr, or an NS for addr -// (implying another node is attempting to use addr)). It is up to the caller -// of this function to handle such a scenario. Normally, addr will be removed -// from n right after this function returns or the address successfully -// resolved. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) stopDuplicateAddressDetection(addr tcpip.Address) { - dad, ok := ndp.dad[addr] - if !ok { - // Not currently performing DAD on addr, just return. - return - } - - if dad.timer != nil { - dad.timer.Stop() - dad.timer = nil - - *dad.done = true - dad.done = nil - } - - delete(ndp.dad, addr) - - // Let the integrator know DAD did not resolve. - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnDuplicateAddressDetectionStatus(ndp.nic.ID(), addr, false, nil) - } -} - -// handleRA handles a Router Advertisement message that arrived on the NIC -// this ndp is for. Does nothing if the NIC is configured to not handle RAs. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) { - // Is the NIC configured to handle RAs at all? - // - // Currently, the stack does not determine router interface status on a - // per-interface basis; it is a stack-wide configuration, so we check - // stack's forwarding flag to determine if the NIC is a routing - // interface. - if !ndp.configs.HandleRAs || ndp.nic.stack.Forwarding(header.IPv6ProtocolNumber) { - return - } - - // 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.nic.stack.ndpDisp; ndpDisp != nil { - var configuration DHCPv6ConfigurationFromNDPRA - switch { - case ra.ManagedAddrConfFlag(): - configuration = DHCPv6ManagedAddress - - case ra.OtherConfFlag(): - configuration = DHCPv6OtherConfigurations - - default: - configuration = DHCPv6NoConfiguration - } - - if ndp.dhcpv6Configuration != configuration { - ndp.dhcpv6Configuration = configuration - ndpDisp.OnDHCPv6Configuration(ndp.nic.ID(), configuration) - } - } - - // Is the NIC configured to discover default routers? - if ndp.configs.DiscoverDefaultRouters { - rtr, ok := ndp.defaultRouters[ip] - rl := ra.RouterLifetime() - switch { - case !ok && rl != 0: - // This is a new default router we are discovering. - // - // Only remember it if we currently know about less than - // MaxDiscoveredDefaultRouters routers. - if len(ndp.defaultRouters) < MaxDiscoveredDefaultRouters { - ndp.rememberDefaultRouter(ip, rl) - } - - case ok && rl != 0: - // This is an already discovered default router. Update - // the invalidation job. - rtr.invalidationJob.Cancel() - rtr.invalidationJob.Schedule(rl) - ndp.defaultRouters[ip] = rtr - - case ok && rl == 0: - // We know about the router but it is no longer to be - // used as a default router so invalidate it. - ndp.invalidateDefaultRouter(ip) - } - } - - // TODO(b/141556115): Do (RetransTimer, ReachableTime)) Parameter - // Discovery. - - // We know the options is valid as far as wire format is concerned since - // we got the Router Advertisement, as documented by this fn. Given this - // we do not check the iterator for errors on calls to Next. - it, _ := ra.Options().Iter(false) - for opt, done, _ := it.Next(); !done; opt, done, _ = it.Next() { - switch opt := opt.(type) { - case header.NDPRecursiveDNSServer: - if ndp.nic.stack.ndpDisp == nil { - continue - } - - addrs, _ := opt.Addresses() - ndp.nic.stack.ndpDisp.OnRecursiveDNSServerOption(ndp.nic.ID(), addrs, opt.Lifetime()) - - case header.NDPDNSSearchList: - if ndp.nic.stack.ndpDisp == nil { - continue - } - - domainNames, _ := opt.DomainNames() - ndp.nic.stack.ndpDisp.OnDNSSearchListOption(ndp.nic.ID(), domainNames, opt.Lifetime()) - - case header.NDPPrefixInformation: - prefix := opt.Subnet() - - // Is the prefix a link-local? - if header.IsV6LinkLocalAddress(prefix.ID()) { - // ...Yes, skip as per RFC 4861 section 6.3.4, - // and RFC 4862 section 5.5.3.b (for SLAAC). - continue - } - - // Is the Prefix Length 0? - if prefix.Prefix() == 0 { - // ...Yes, skip as this is an invalid prefix - // as all IPv6 addresses cannot be on-link. - continue - } - - if opt.OnLinkFlag() { - ndp.handleOnLinkPrefixInformation(opt) - } - - if opt.AutonomousAddressConfigurationFlag() { - ndp.handleAutonomousPrefixInformation(opt) - } - } - - // TODO(b/141556115): Do (MTU) Parameter Discovery. - } -} - -// invalidateDefaultRouter invalidates a discovered default router. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) invalidateDefaultRouter(ip tcpip.Address) { - rtr, ok := ndp.defaultRouters[ip] - - // Is the router still discovered? - if !ok { - // ...Nope, do nothing further. - return - } - - rtr.invalidationJob.Cancel() - delete(ndp.defaultRouters, ip) - - // Let the integrator know a discovered default router is invalidated. - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnDefaultRouterInvalidated(ndp.nic.ID(), ip) - } -} - -// rememberDefaultRouter remembers a newly discovered default router with IPv6 -// link-local address ip with lifetime rl. -// -// The router identified by ip MUST NOT already be known by the NIC. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) rememberDefaultRouter(ip tcpip.Address, rl time.Duration) { - ndpDisp := ndp.nic.stack.ndpDisp - if ndpDisp == nil { - return - } - - // Inform the integrator when we discovered a default router. - if !ndpDisp.OnDefaultRouterDiscovered(ndp.nic.ID(), ip) { - // Informed by the integrator to not remember the router, do - // nothing further. - return - } - - state := defaultRouterState{ - invalidationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - ndp.invalidateDefaultRouter(ip) - }), - } - - state.invalidationJob.Schedule(rl) - - ndp.defaultRouters[ip] = state -} - -// rememberOnLinkPrefix remembers a newly discovered on-link prefix with IPv6 -// address with prefix prefix with lifetime l. -// -// The prefix identified by prefix MUST NOT already be known. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) rememberOnLinkPrefix(prefix tcpip.Subnet, l time.Duration) { - ndpDisp := ndp.nic.stack.ndpDisp - if ndpDisp == nil { - return - } - - // Inform the integrator when we discovered an on-link prefix. - if !ndpDisp.OnOnLinkPrefixDiscovered(ndp.nic.ID(), prefix) { - // Informed by the integrator to not remember the prefix, do - // nothing further. - return - } - - state := onLinkPrefixState{ - invalidationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - ndp.invalidateOnLinkPrefix(prefix) - }), - } - - if l < header.NDPInfiniteLifetime { - state.invalidationJob.Schedule(l) - } - - ndp.onLinkPrefixes[prefix] = state -} - -// invalidateOnLinkPrefix invalidates a discovered on-link prefix. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) invalidateOnLinkPrefix(prefix tcpip.Subnet) { - s, ok := ndp.onLinkPrefixes[prefix] - - // Is the on-link prefix still discovered? - if !ok { - // ...Nope, do nothing further. - return - } - - s.invalidationJob.Cancel() - delete(ndp.onLinkPrefixes, prefix) - - // Let the integrator know a discovered on-link prefix is invalidated. - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnOnLinkPrefixInvalidated(ndp.nic.ID(), prefix) - } -} - -// handleOnLinkPrefixInformation handles a Prefix Information option with -// its on-link flag set, as per RFC 4861 section 6.3.4. -// -// handleOnLinkPrefixInformation assumes that the prefix this pi is for is -// not the link-local prefix and the on-link flag is set. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) handleOnLinkPrefixInformation(pi header.NDPPrefixInformation) { - prefix := pi.Subnet() - prefixState, ok := ndp.onLinkPrefixes[prefix] - vl := pi.ValidLifetime() - - if !ok && vl == 0 { - // Don't know about this prefix but it has a zero valid - // lifetime, so just ignore. - return - } - - if !ok && vl != 0 { - // This is a new on-link prefix we are discovering - // - // Only remember it if we currently know about less than - // MaxDiscoveredOnLinkPrefixes on-link prefixes. - if ndp.configs.DiscoverOnLinkPrefixes && len(ndp.onLinkPrefixes) < MaxDiscoveredOnLinkPrefixes { - ndp.rememberOnLinkPrefix(prefix, vl) - } - return - } - - if ok && vl == 0 { - // We know about the on-link prefix, but it is - // no longer to be considered on-link, so - // invalidate it. - ndp.invalidateOnLinkPrefix(prefix) - return - } - - // This is an already discovered on-link prefix with a - // new non-zero valid lifetime. - // - // Update the invalidation job. - - prefixState.invalidationJob.Cancel() - - if vl < header.NDPInfiniteLifetime { - // Prefix is valid for a finite lifetime, schedule the job to execute after - // the new valid lifetime. - prefixState.invalidationJob.Schedule(vl) - } - - ndp.onLinkPrefixes[prefix] = prefixState -} - -// handleAutonomousPrefixInformation handles a Prefix Information option with -// its autonomous flag set, as per RFC 4862 section 5.5.3. -// -// handleAutonomousPrefixInformation assumes that the prefix this pi is for is -// not the link-local prefix and the autonomous flag is set. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) handleAutonomousPrefixInformation(pi header.NDPPrefixInformation) { - vl := pi.ValidLifetime() - pl := pi.PreferredLifetime() - - // If the preferred lifetime is greater than the valid lifetime, - // silently ignore the Prefix Information option, as per RFC 4862 - // section 5.5.3.c. - if pl > vl { - return - } - - prefix := pi.Subnet() - - // Check if we already maintain SLAAC state for prefix. - if state, ok := ndp.slaacPrefixes[prefix]; ok { - // As per RFC 4862 section 5.5.3.e, refresh prefix's SLAAC lifetimes. - ndp.refreshSLAACPrefixLifetimes(prefix, &state, pl, vl) - ndp.slaacPrefixes[prefix] = state - return - } - - // prefix is a new SLAAC prefix. Do the work as outlined by RFC 4862 section - // 5.5.3.d if ndp is configured to auto-generate new addresses via SLAAC. - if !ndp.configs.AutoGenGlobalAddresses { - return - } - - ndp.doSLAAC(prefix, pl, vl) -} - -// doSLAAC generates a new SLAAC address with the provided lifetimes -// for prefix. -// -// pl is the new preferred lifetime. vl is the new valid lifetime. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) doSLAAC(prefix tcpip.Subnet, pl, vl time.Duration) { - // If we do not already have an address for this prefix and the valid - // lifetime is 0, no need to do anything further, as per RFC 4862 - // section 5.5.3.d. - if vl == 0 { - return - } - - // Make sure the prefix is valid (as far as its length is concerned) to - // generate a valid IPv6 address from an interface identifier (IID), as - // per RFC 4862 sectiion 5.5.3.d. - if prefix.Prefix() != validPrefixLenForAutoGen { - return - } - - state := slaacPrefixState{ - deprecationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - state, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for the deprecated SLAAC prefix %s", prefix)) - } - - ndp.deprecateSLAACAddress(state.stableAddr.ref) - }), - invalidationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - state, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for the invalidated SLAAC prefix %s", prefix)) - } - - ndp.invalidateSLAACPrefix(prefix, state) - }), - tempAddrs: make(map[tcpip.Address]tempSLAACAddrState), - maxGenerationAttempts: ndp.configs.AutoGenAddressConflictRetries + 1, - } - - now := time.Now() - - // The time an address is preferred until is needed to properly generate the - // address. - if pl < header.NDPInfiniteLifetime { - state.preferredUntil = now.Add(pl) - } - - if !ndp.generateSLAACAddr(prefix, &state) { - // We were unable to generate an address for the prefix, we do not nothing - // further as there is no reason to maintain state or jobs for a prefix we - // do not have an address for. - return - } - - // Setup the initial jobs to deprecate and invalidate prefix. - - if pl < header.NDPInfiniteLifetime && pl != 0 { - state.deprecationJob.Schedule(pl) - } - - if vl < header.NDPInfiniteLifetime { - state.invalidationJob.Schedule(vl) - state.validUntil = now.Add(vl) - } - - // If the address is assigned (DAD resolved), generate a temporary address. - if state.stableAddr.ref.getKind() == permanent { - // Reset the generation attempts counter as we are starting the generation - // of a new address for the SLAAC prefix. - ndp.generateTempSLAACAddr(prefix, &state, true /* resetGenAttempts */) - } - - ndp.slaacPrefixes[prefix] = state -} - -// addSLAACAddr adds a SLAAC address to the NIC. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) addSLAACAddr(addr tcpip.AddressWithPrefix, configType networkEndpointConfigType, deprecated bool) *referencedNetworkEndpoint { - // Inform the integrator that we have a new SLAAC address. - ndpDisp := ndp.nic.stack.ndpDisp - if ndpDisp == nil { - return nil - } - - if !ndpDisp.OnAutoGenAddress(ndp.nic.ID(), addr) { - // Informed by the integrator not to add the address. - return nil - } - - protocolAddr := tcpip.ProtocolAddress{ - Protocol: header.IPv6ProtocolNumber, - AddressWithPrefix: addr, - } - - ref, err := ndp.nic.addAddressLocked(protocolAddr, FirstPrimaryEndpoint, permanent, configType, deprecated) - if err != nil { - panic(fmt.Sprintf("ndp: error when adding SLAAC address %+v: %s", protocolAddr, err)) - } - - return ref -} - -// generateSLAACAddr generates a SLAAC address for prefix. -// -// Returns true if an address was successfully generated. -// -// Panics if the prefix is not a SLAAC prefix or it already has an address. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) generateSLAACAddr(prefix tcpip.Subnet, state *slaacPrefixState) bool { - if r := state.stableAddr.ref; r != nil { - panic(fmt.Sprintf("ndp: SLAAC prefix %s already has a permenant address %s", prefix, r.addrWithPrefix())) - } - - // If we have already reached the maximum address generation attempts for the - // prefix, do not generate another address. - if state.generationAttempts == state.maxGenerationAttempts { - return false - } - - var generatedAddr tcpip.AddressWithPrefix - addrBytes := []byte(prefix.ID()) - - for i := 0; ; i++ { - // If we were unable to generate an address after the maximum SLAAC address - // local regeneration attempts, do nothing further. - if i == maxSLAACAddrLocalRegenAttempts { - return false - } - - dadCounter := state.generationAttempts + state.stableAddr.localGenerationFailures - if oIID := ndp.nic.stack.opaqueIIDOpts; oIID.NICNameFromID != nil { - addrBytes = header.AppendOpaqueInterfaceIdentifier( - addrBytes[:header.IIDOffsetInIPv6Address], - prefix, - oIID.NICNameFromID(ndp.nic.ID(), ndp.nic.name), - dadCounter, - oIID.SecretKey, - ) - } else if dadCounter == 0 { - // Modified-EUI64 based IIDs have no way to resolve DAD conflicts, so if - // the DAD counter is non-zero, we cannot use this method. - // - // Only attempt to generate an interface-specific IID if we have a valid - // link address. - // - // TODO(b/141011931): Validate a LinkEndpoint's link address (provided by - // LinkEndpoint.LinkAddress) before reaching this point. - linkAddr := ndp.nic.linkEP.LinkAddress() - if !header.IsValidUnicastEthernetAddress(linkAddr) { - return false - } - - // Generate an address within prefix from the modified EUI-64 of ndp's - // NIC's Ethernet MAC address. - header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr, addrBytes[header.IIDOffsetInIPv6Address:]) - } else { - // We have no way to regenerate an address in response to an address - // conflict when addresses are not generated with opaque IIDs. - return false - } - - generatedAddr = tcpip.AddressWithPrefix{ - Address: tcpip.Address(addrBytes), - PrefixLen: validPrefixLenForAutoGen, - } - - if !ndp.nic.hasPermanentAddrLocked(generatedAddr.Address) { - break - } - - state.stableAddr.localGenerationFailures++ - } - - if ref := ndp.addSLAACAddr(generatedAddr, slaac, time.Since(state.preferredUntil) >= 0 /* deprecated */); ref != nil { - state.stableAddr.ref = ref - state.generationAttempts++ - return true - } - - return false -} - -// regenerateSLAACAddr regenerates an address for a SLAAC prefix. -// -// If generating a new address for the prefix fails, the prefix will be -// invalidated. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) regenerateSLAACAddr(prefix tcpip.Subnet) { - state, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: SLAAC prefix state not found to regenerate address for %s", prefix)) - } - - if ndp.generateSLAACAddr(prefix, &state) { - ndp.slaacPrefixes[prefix] = state - return - } - - // We were unable to generate a permanent address for the SLAAC prefix so - // invalidate the prefix as there is no reason to maintain state for a - // SLAAC prefix we do not have an address for. - ndp.invalidateSLAACPrefix(prefix, state) -} - -// generateTempSLAACAddr generates a new temporary SLAAC address. -// -// If resetGenAttempts is true, the prefix's generation counter will be reset. -// -// Returns true if a new address was generated. -func (ndp *ndpState) generateTempSLAACAddr(prefix tcpip.Subnet, prefixState *slaacPrefixState, resetGenAttempts bool) bool { - // Are we configured to auto-generate new temporary global addresses for the - // prefix? - if !ndp.configs.AutoGenTempGlobalAddresses || prefix == header.IPv6LinkLocalPrefix.Subnet() { - return false - } - - if resetGenAttempts { - prefixState.generationAttempts = 0 - prefixState.maxGenerationAttempts = ndp.configs.AutoGenAddressConflictRetries + 1 - } - - // If we have already reached the maximum address generation attempts for the - // prefix, do not generate another address. - if prefixState.generationAttempts == prefixState.maxGenerationAttempts { - return false - } - - stableAddr := prefixState.stableAddr.ref.address() - now := time.Now() - - // As per RFC 4941 section 3.3 step 4, the valid lifetime of a temporary - // 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 != (time.Time{}) { - if prefixVL := prefixState.validUntil.Sub(now); vl > prefixVL { - vl = prefixVL - } - } - - if vl <= 0 { - // Cannot create an address without a valid lifetime. - return false - } - - // As per RFC 4941 section 3.3 step 4, the preferred lifetime of a temporary - // address is the lower of the preferred lifetime of the stable address or the - // maximum temporary address preferred lifetime - the temporary address desync - // factor. - pl := ndp.configs.MaxTempAddrPreferredLifetime - ndp.temporaryAddressDesyncFactor - if prefixState.preferredUntil != (time.Time{}) { - if prefixPL := prefixState.preferredUntil.Sub(now); pl > prefixPL { - // Respect the preferred lifetime of the prefix, as per RFC 4941 section - // 3.3 step 4. - pl = prefixPL - } - } - - // As per RFC 4941 section 3.3 step 5, a temporary address is created only if - // the calculated preferred lifetime is greater than the advance regeneration - // duration. In particular, we MUST NOT create a temporary address with a zero - // Preferred Lifetime. - if pl <= ndp.configs.RegenAdvanceDuration { - return false - } - - // Attempt to generate a new address that is not already assigned to the NIC. - var generatedAddr tcpip.AddressWithPrefix - for i := 0; ; i++ { - // If we were unable to generate an address after the maximum SLAAC address - // local regeneration attempts, do nothing further. - if i == maxSLAACAddrLocalRegenAttempts { - return false - } - - generatedAddr = header.GenerateTempIPv6SLAACAddr(ndp.temporaryIIDHistory[:], stableAddr) - if !ndp.nic.hasPermanentAddrLocked(generatedAddr.Address) { - break - } - } - - // As per RFC RFC 4941 section 3.3 step 5, we MUST NOT create a temporary - // address with a zero preferred lifetime. The checks above ensure this - // so we know the address is not deprecated. - ref := ndp.addSLAACAddr(generatedAddr, slaacTemp, false /* deprecated */) - if ref == nil { - return false - } - - state := tempSLAACAddrState{ - deprecationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - prefixState, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for %s to deprecate temporary address %s", prefix, generatedAddr)) - } - - tempAddrState, ok := prefixState.tempAddrs[generatedAddr.Address] - if !ok { - panic(fmt.Sprintf("ndp: must have a tempAddr entry to deprecate temporary address %s", generatedAddr)) - } - - ndp.deprecateSLAACAddress(tempAddrState.ref) - }), - invalidationJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - prefixState, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for %s to invalidate temporary address %s", prefix, generatedAddr)) - } - - tempAddrState, ok := prefixState.tempAddrs[generatedAddr.Address] - if !ok { - panic(fmt.Sprintf("ndp: must have a tempAddr entry to invalidate temporary address %s", generatedAddr)) - } - - ndp.invalidateTempSLAACAddr(prefixState.tempAddrs, generatedAddr.Address, tempAddrState) - }), - regenJob: ndp.nic.stack.newJob(&ndp.nic.mu, func() { - prefixState, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for %s to regenerate temporary address after %s", prefix, generatedAddr)) - } - - tempAddrState, ok := prefixState.tempAddrs[generatedAddr.Address] - if !ok { - panic(fmt.Sprintf("ndp: must have a tempAddr entry to regenerate temporary address after %s", generatedAddr)) - } - - // If an address has already been regenerated for this address, don't - // regenerate another address. - if tempAddrState.regenerated { - return - } - - // Reset the generation attempts counter as we are starting the generation - // of a new address for the SLAAC prefix. - tempAddrState.regenerated = ndp.generateTempSLAACAddr(prefix, &prefixState, true /* resetGenAttempts */) - prefixState.tempAddrs[generatedAddr.Address] = tempAddrState - ndp.slaacPrefixes[prefix] = prefixState - }), - createdAt: now, - ref: ref, - } - - state.deprecationJob.Schedule(pl) - state.invalidationJob.Schedule(vl) - state.regenJob.Schedule(pl - ndp.configs.RegenAdvanceDuration) - - prefixState.generationAttempts++ - prefixState.tempAddrs[generatedAddr.Address] = state - - return true -} - -// regenerateTempSLAACAddr regenerates a temporary address for a SLAAC prefix. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) regenerateTempSLAACAddr(prefix tcpip.Subnet, resetGenAttempts bool) { - state, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: SLAAC prefix state not found to regenerate temporary address for %s", prefix)) - } - - ndp.generateTempSLAACAddr(prefix, &state, resetGenAttempts) - ndp.slaacPrefixes[prefix] = state -} - -// refreshSLAACPrefixLifetimes refreshes the lifetimes of a SLAAC prefix. -// -// pl is the new preferred lifetime. vl is the new valid lifetime. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, prefixState *slaacPrefixState, pl, vl time.Duration) { - // If the preferred lifetime is zero, then the prefix should be deprecated. - deprecated := pl == 0 - if deprecated { - ndp.deprecateSLAACAddress(prefixState.stableAddr.ref) - } else { - prefixState.stableAddr.ref.deprecated = false - } - - // If prefix was preferred for some finite lifetime before, cancel the - // deprecation job so it can be reset. - prefixState.deprecationJob.Cancel() - - now := time.Now() - - // Schedule the deprecation job if prefix has a finite preferred lifetime. - if pl < header.NDPInfiniteLifetime { - if !deprecated { - prefixState.deprecationJob.Schedule(pl) - } - prefixState.preferredUntil = now.Add(pl) - } else { - prefixState.preferredUntil = time.Time{} - } - - // As per RFC 4862 section 5.5.3.e, update the valid lifetime for prefix: - // - // 1) If the received Valid Lifetime is greater than 2 hours or greater than - // RemainingLifetime, set the valid lifetime of the prefix to the - // advertised Valid Lifetime. - // - // 2) If RemainingLifetime is less than or equal to 2 hours, ignore the - // advertised Valid Lifetime. - // - // 3) Otherwise, reset the valid lifetime of the prefix to 2 hours. - - if vl >= header.NDPInfiniteLifetime { - // Handle the infinite valid lifetime separately as we do not schedule a - // job in this case. - prefixState.invalidationJob.Cancel() - prefixState.validUntil = time.Time{} - } 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 == (time.Time{}) { - rl = header.NDPInfiniteLifetime - } else { - rl = time.Until(prefixState.validUntil) - } - - if vl > MinPrefixInformationValidLifetimeForUpdate || vl > rl { - effectiveVl = vl - } else if rl > MinPrefixInformationValidLifetimeForUpdate { - effectiveVl = MinPrefixInformationValidLifetimeForUpdate - } - - if effectiveVl != 0 { - prefixState.invalidationJob.Cancel() - prefixState.invalidationJob.Schedule(effectiveVl) - prefixState.validUntil = now.Add(effectiveVl) - } - } - - // If DAD is not yet complete on the stable address, there is no need to do - // work with temporary addresses. - if prefixState.stableAddr.ref.getKind() != permanent { - return - } - - // Note, we do not need to update the entries in the temporary address map - // after updating the jobs because the jobs are held as pointers. - var regenForAddr tcpip.Address - allAddressesRegenerated := true - for tempAddr, tempAddrState := range prefixState.tempAddrs { - // As per RFC 4941 section 3.3 step 4, the valid lifetime of a temporary - // address is the lower of the valid lifetime of the stable address or the - // 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 != (time.Time{}) && validUntil.Sub(prefixState.validUntil) > 0 { - validUntil = prefixState.validUntil - } - - // If the address is no longer valid, invalidate it immediately. Otherwise, - // reset the invalidation job. - newValidLifetime := validUntil.Sub(now) - if newValidLifetime <= 0 { - ndp.invalidateTempSLAACAddr(prefixState.tempAddrs, tempAddr, tempAddrState) - continue - } - tempAddrState.invalidationJob.Cancel() - tempAddrState.invalidationJob.Schedule(newValidLifetime) - - // As per RFC 4941 section 3.3 step 4, the preferred lifetime of a temporary - // address is the lower of the preferred lifetime of the stable address or - // the maximum temporary address preferred lifetime - the temporary address - // 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 != (time.Time{}) && preferredUntil.Sub(prefixState.preferredUntil) > 0 { - 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.ref) - } else { - tempAddrState.ref.deprecated = false - tempAddrState.deprecationJob.Schedule(newPreferredLifetime) - } - - tempAddrState.regenJob.Cancel() - if tempAddrState.regenerated { - } else { - allAddressesRegenerated = false - - if newPreferredLifetime <= ndp.configs.RegenAdvanceDuration { - // The new preferred lifetime is less than the advance regeneration - // duration so regenerate an address for this temporary address - // immediately after we finish iterating over the temporary addresses. - regenForAddr = tempAddr - } else { - tempAddrState.regenJob.Schedule(newPreferredLifetime - ndp.configs.RegenAdvanceDuration) - } - } - } - - // Generate a new temporary address if all of the existing temporary addresses - // have been regenerated, or we need to immediately regenerate an address - // due to an update in preferred lifetime. - // - // If each temporay address has already been regenerated, no new temporary - // address will be generated. To ensure continuation of temporary SLAAC - // addresses, we manually try to regenerate an address here. - if len(regenForAddr) != 0 || allAddressesRegenerated { - // Reset the generation attempts counter as we are starting the generation - // of a new address for the SLAAC prefix. - if state, ok := prefixState.tempAddrs[regenForAddr]; ndp.generateTempSLAACAddr(prefix, prefixState, true /* resetGenAttempts */) && ok { - state.regenerated = true - prefixState.tempAddrs[regenForAddr] = state - } - } -} - -// deprecateSLAACAddress marks ref as deprecated and notifies the stack's NDP -// dispatcher that ref has been deprecated. -// -// deprecateSLAACAddress does nothing if ref is already deprecated. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) deprecateSLAACAddress(ref *referencedNetworkEndpoint) { - if ref.deprecated { - return - } - - ref.deprecated = true - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnAutoGenAddressDeprecated(ndp.nic.ID(), ref.addrWithPrefix()) - } -} - -// invalidateSLAACPrefix invalidates a SLAAC prefix. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) invalidateSLAACPrefix(prefix tcpip.Subnet, state slaacPrefixState) { - if r := state.stableAddr.ref; r != nil { - // Since we are already invalidating the prefix, do not invalidate the - // prefix when removing the address. - if err := ndp.nic.removePermanentIPv6EndpointLocked(r, false /* allowSLAACInvalidation */); err != nil { - panic(fmt.Sprintf("ndp: error removing stable SLAAC address %s: %s", r.addrWithPrefix(), err)) - } - } - - ndp.cleanupSLAACPrefixResources(prefix, state) -} - -// cleanupSLAACAddrResourcesAndNotify cleans up an invalidated SLAAC address's -// resources. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) cleanupSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix, invalidatePrefix bool) { - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnAutoGenAddressInvalidated(ndp.nic.ID(), addr) - } - - prefix := addr.Subnet() - state, ok := ndp.slaacPrefixes[prefix] - if !ok || state.stableAddr.ref == nil || addr.Address != state.stableAddr.ref.address() { - return - } - - if !invalidatePrefix { - // If the prefix is not being invalidated, disassociate the address from the - // prefix and do nothing further. - state.stableAddr.ref = nil - ndp.slaacPrefixes[prefix] = state - return - } - - ndp.cleanupSLAACPrefixResources(prefix, state) -} - -// cleanupSLAACPrefixResources cleans up a SLAAC prefix's jobs and entry. -// -// Panics if the SLAAC prefix is not known. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) cleanupSLAACPrefixResources(prefix tcpip.Subnet, state slaacPrefixState) { - // Invalidate all temporary addresses. - for tempAddr, tempAddrState := range state.tempAddrs { - ndp.invalidateTempSLAACAddr(state.tempAddrs, tempAddr, tempAddrState) - } - - state.stableAddr.ref = nil - state.deprecationJob.Cancel() - state.invalidationJob.Cancel() - delete(ndp.slaacPrefixes, prefix) -} - -// invalidateTempSLAACAddr invalidates a temporary SLAAC address. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) invalidateTempSLAACAddr(tempAddrs map[tcpip.Address]tempSLAACAddrState, tempAddr tcpip.Address, tempAddrState tempSLAACAddrState) { - // Since we are already invalidating the address, do not invalidate the - // address when removing the address. - if err := ndp.nic.removePermanentIPv6EndpointLocked(tempAddrState.ref, false /* allowSLAACInvalidation */); err != nil { - panic(fmt.Sprintf("error removing temporary SLAAC address %s: %s", tempAddrState.ref.addrWithPrefix(), err)) - } - - ndp.cleanupTempSLAACAddrResources(tempAddrs, tempAddr, tempAddrState) -} - -// cleanupTempSLAACAddrResourcesAndNotify cleans up an invalidated temporary -// SLAAC address's resources from ndp. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) cleanupTempSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix, invalidateAddr bool) { - if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil { - ndpDisp.OnAutoGenAddressInvalidated(ndp.nic.ID(), addr) - } - - if !invalidateAddr { - return - } - - prefix := addr.Subnet() - state, ok := ndp.slaacPrefixes[prefix] - if !ok { - panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry to clean up temp addr %s resources", addr)) - } - - tempAddrState, ok := state.tempAddrs[addr.Address] - if !ok { - panic(fmt.Sprintf("ndp: must have a tempAddr entry to clean up temp addr %s resources", addr)) - } - - ndp.cleanupTempSLAACAddrResources(state.tempAddrs, addr.Address, tempAddrState) -} - -// cleanupTempSLAACAddrResourcesAndNotify cleans up a temporary SLAAC address's -// jobs and entry. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) cleanupTempSLAACAddrResources(tempAddrs map[tcpip.Address]tempSLAACAddrState, tempAddr tcpip.Address, tempAddrState tempSLAACAddrState) { - tempAddrState.deprecationJob.Cancel() - tempAddrState.invalidationJob.Cancel() - tempAddrState.regenJob.Cancel() - delete(tempAddrs, tempAddr) -} - -// cleanupState cleans up ndp's state. -// -// If hostOnly is true, then only host-specific state will be cleaned up. -// -// cleanupState MUST be called with hostOnly set to true when ndp's NIC is -// transitioning from a host to a router. This function will invalidate all -// discovered on-link prefixes, discovered routers, and auto-generated -// addresses. -// -// If hostOnly is true, then the link-local auto-generated address will not be -// invalidated as routers are also expected to generate a link-local address. -// -// The NIC that ndp belongs to MUST be locked. -func (ndp *ndpState) cleanupState(hostOnly bool) { - linkLocalSubnet := header.IPv6LinkLocalPrefix.Subnet() - linkLocalPrefixes := 0 - for prefix, state := range ndp.slaacPrefixes { - // RFC 4862 section 5 states that routers are also expected to generate a - // link-local address so we do not invalidate them if we are cleaning up - // host-only state. - if hostOnly && prefix == linkLocalSubnet { - linkLocalPrefixes++ - continue - } - - ndp.invalidateSLAACPrefix(prefix, state) - } - - if got := len(ndp.slaacPrefixes); got != linkLocalPrefixes { - panic(fmt.Sprintf("ndp: still have non-linklocal SLAAC prefixes after cleaning up; found = %d prefixes, of which %d are link-local", got, linkLocalPrefixes)) - } - - for prefix := range ndp.onLinkPrefixes { - ndp.invalidateOnLinkPrefix(prefix) - } - - if got := len(ndp.onLinkPrefixes); got != 0 { - panic(fmt.Sprintf("ndp: still have discovered on-link prefixes after cleaning up; found = %d", got)) - } - - for router := range ndp.defaultRouters { - ndp.invalidateDefaultRouter(router) - } - - if got := len(ndp.defaultRouters); got != 0 { - panic(fmt.Sprintf("ndp: still have discovered default routers after cleaning up; found = %d", got)) - } - - ndp.dhcpv6Configuration = 0 -} - -// startSolicitingRouters starts soliciting routers, as per RFC 4861 section -// 6.3.7. If routers are already being solicited, this function does nothing. -// -// The NIC ndp belongs to MUST be locked. -func (ndp *ndpState) startSolicitingRouters() { - if ndp.rtrSolicit.timer != nil { - // We are already soliciting routers. - return - } - - remaining := ndp.configs.MaxRtrSolicitations - if remaining == 0 { - return - } - - // Calculate the random delay before sending our first RS, as per RFC - // 4861 section 6.3.7. - var delay time.Duration - if ndp.configs.MaxRtrSolicitationDelay > 0 { - delay = time.Duration(rand.Int63n(int64(ndp.configs.MaxRtrSolicitationDelay))) - } - - var done bool - ndp.rtrSolicit.done = &done - ndp.rtrSolicit.timer = ndp.nic.stack.Clock().AfterFunc(delay, func() { - ndp.nic.mu.Lock() - if done { - // If we reach this point, it means that the RS timer fired after another - // goroutine already obtained the NIC lock and stopped solicitations. - // Simply return here and do nothing further. - ndp.nic.mu.Unlock() - return - } - - // As per RFC 4861 section 4.1, the source of the RS is an address assigned - // to the sending interface, or the unspecified address if no address is - // assigned to the sending interface. - ref := ndp.nic.primaryIPv6EndpointRLocked(header.IPv6AllRoutersMulticastAddress) - if ref == nil { - ref = ndp.nic.getRefOrCreateTempLocked(header.IPv6ProtocolNumber, header.IPv6Any, NeverPrimaryEndpoint) - } - ndp.nic.mu.Unlock() - - localAddr := ref.address() - r := makeRoute(header.IPv6ProtocolNumber, localAddr, header.IPv6AllRoutersMulticastAddress, ndp.nic.linkEP.LinkAddress(), ref, false, false) - defer r.Release() - - // Route should resolve immediately since - // header.IPv6AllRoutersMulticastAddress is a multicast address so a - // remote link address can be calculated without a resolution process. - if c, err := r.Resolve(nil); err != nil { - // Do not consider the NIC being unknown or disabled as a fatal error. - // Since this method is required to be called when the NIC is not locked, - // the NIC could have been disabled or removed by another goroutine. - if err == tcpip.ErrUnknownNICID || err == tcpip.ErrInvalidEndpointState { - return - } - - panic(fmt.Sprintf("ndp: error when resolving route to send NDP RS (%s -> %s on NIC(%d)): %s", header.IPv6Any, header.IPv6AllRoutersMulticastAddress, ndp.nic.ID(), err)) - } else if c != nil { - panic(fmt.Sprintf("ndp: route resolution not immediate for route to send NDP RS (%s -> %s on NIC(%d))", header.IPv6Any, header.IPv6AllRoutersMulticastAddress, ndp.nic.ID())) - } - - // As per RFC 4861 section 4.1, an NDP RS SHOULD include the source - // link-layer address option if the source address of the NDP RS is - // specified. This option MUST NOT be included if the source address is - // unspecified. - // - // TODO(b/141011931): Validate a LinkEndpoint's link address (provided by - // LinkEndpoint.LinkAddress) before reaching this point. - var optsSerializer header.NDPOptionsSerializer - if localAddr != header.IPv6Any && header.IsValidUnicastEthernetAddress(r.LocalLinkAddress) { - optsSerializer = header.NDPOptionsSerializer{ - header.NDPSourceLinkLayerAddressOption(r.LocalLinkAddress), - } - } - payloadSize := header.ICMPv6HeaderSize + header.NDPRSMinimumSize + int(optsSerializer.Length()) - icmpData := header.ICMPv6(buffer.NewView(payloadSize)) - icmpData.SetType(header.ICMPv6RouterSolicit) - rs := header.NDPRouterSolicit(icmpData.NDPPayload()) - rs.Options().Serialize(optsSerializer) - icmpData.SetChecksum(header.ICMPv6Checksum(icmpData, r.LocalAddress, r.RemoteAddress, buffer.VectorisedView{})) - - pkt := NewPacketBuffer(PacketBufferOptions{ - ReserveHeaderBytes: int(r.MaxHeaderLength()), - Data: buffer.View(icmpData).ToVectorisedView(), - }) - - sent := r.Stats().ICMP.V6PacketsSent - if err := r.WritePacket(nil, - NetworkHeaderParams{ - Protocol: header.ICMPv6ProtocolNumber, - TTL: header.NDPHopLimit, - TOS: DefaultTOS, - }, pkt, - ); err != nil { - sent.Dropped.Increment() - log.Printf("startSolicitingRouters: error writing NDP router solicit message on NIC(%d); err = %s", ndp.nic.ID(), err) - // Don't send any more messages if we had an error. - remaining = 0 - } else { - sent.RouterSolicit.Increment() - remaining-- - } - - ndp.nic.mu.Lock() - if done || remaining == 0 { - ndp.rtrSolicit.timer = nil - ndp.rtrSolicit.done = nil - } else if ndp.rtrSolicit.timer != nil { - // Note, we need to explicitly check to make sure that - // the timer field is not nil because if it was nil but - // we still reached this point, then we know the NIC - // was requested to stop soliciting routers so we don't - // need to send the next Router Solicitation message. - ndp.rtrSolicit.timer.Reset(ndp.configs.RtrSolicitationInterval) - } - ndp.nic.mu.Unlock() - }) - -} - -// stopSolicitingRouters stops soliciting routers. If routers are not currently -// being solicited, this function does nothing. -// -// The NIC ndp belongs to MUST be locked. -func (ndp *ndpState) stopSolicitingRouters() { - if ndp.rtrSolicit.timer == nil { - // Nothing to do. - return - } - - *ndp.rtrSolicit.done = true - ndp.rtrSolicit.timer.Stop() - ndp.rtrSolicit.timer = nil - ndp.rtrSolicit.done = nil -} - -// initializeTempAddrState initializes state related to temporary SLAAC -// addresses. -func (ndp *ndpState) initializeTempAddrState() { - header.InitialTempIID(ndp.temporaryIIDHistory[:], ndp.nic.stack.tempIIDSeed, ndp.nic.ID()) - - if MaxDesyncFactor != 0 { - ndp.temporaryAddressDesyncFactor = time.Duration(rand.Int63n(int64(MaxDesyncFactor))) - } -} diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go index 8416dbcdb..73a01c2dd 100644 --- a/pkg/tcpip/stack/ndp_test.go +++ b/pkg/tcpip/stack/ndp_test.go @@ -150,10 +150,10 @@ type ndpDNSSLEvent struct { type ndpDHCPv6Event struct { nicID tcpip.NICID - configuration stack.DHCPv6ConfigurationFromNDPRA + configuration ipv6.DHCPv6ConfigurationFromNDPRA } -var _ stack.NDPDispatcher = (*ndpDispatcher)(nil) +var _ ipv6.NDPDispatcher = (*ndpDispatcher)(nil) // ndpDispatcher implements NDPDispatcher so tests can know when various NDP // related events happen for test purposes. @@ -170,7 +170,7 @@ type ndpDispatcher struct { dhcpv6ConfigurationC chan ndpDHCPv6Event } -// Implements stack.NDPDispatcher.OnDuplicateAddressDetectionStatus. +// Implements ipv6.NDPDispatcher.OnDuplicateAddressDetectionStatus. func (n *ndpDispatcher) OnDuplicateAddressDetectionStatus(nicID tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) { if n.dadC != nil { n.dadC <- ndpDADEvent{ @@ -182,7 +182,7 @@ func (n *ndpDispatcher) OnDuplicateAddressDetectionStatus(nicID tcpip.NICID, add } } -// Implements stack.NDPDispatcher.OnDefaultRouterDiscovered. +// Implements ipv6.NDPDispatcher.OnDefaultRouterDiscovered. func (n *ndpDispatcher) OnDefaultRouterDiscovered(nicID tcpip.NICID, addr tcpip.Address) bool { if c := n.routerC; c != nil { c <- ndpRouterEvent{ @@ -195,7 +195,7 @@ func (n *ndpDispatcher) OnDefaultRouterDiscovered(nicID tcpip.NICID, addr tcpip. return n.rememberRouter } -// Implements stack.NDPDispatcher.OnDefaultRouterInvalidated. +// Implements ipv6.NDPDispatcher.OnDefaultRouterInvalidated. func (n *ndpDispatcher) OnDefaultRouterInvalidated(nicID tcpip.NICID, addr tcpip.Address) { if c := n.routerC; c != nil { c <- ndpRouterEvent{ @@ -206,7 +206,7 @@ func (n *ndpDispatcher) OnDefaultRouterInvalidated(nicID tcpip.NICID, addr tcpip } } -// Implements stack.NDPDispatcher.OnOnLinkPrefixDiscovered. +// Implements ipv6.NDPDispatcher.OnOnLinkPrefixDiscovered. func (n *ndpDispatcher) OnOnLinkPrefixDiscovered(nicID tcpip.NICID, prefix tcpip.Subnet) bool { if c := n.prefixC; c != nil { c <- ndpPrefixEvent{ @@ -219,7 +219,7 @@ func (n *ndpDispatcher) OnOnLinkPrefixDiscovered(nicID tcpip.NICID, prefix tcpip return n.rememberPrefix } -// Implements stack.NDPDispatcher.OnOnLinkPrefixInvalidated. +// Implements ipv6.NDPDispatcher.OnOnLinkPrefixInvalidated. func (n *ndpDispatcher) OnOnLinkPrefixInvalidated(nicID tcpip.NICID, prefix tcpip.Subnet) { if c := n.prefixC; c != nil { c <- ndpPrefixEvent{ @@ -261,7 +261,7 @@ func (n *ndpDispatcher) OnAutoGenAddressInvalidated(nicID tcpip.NICID, addr tcpi } } -// Implements stack.NDPDispatcher.OnRecursiveDNSServerOption. +// Implements ipv6.NDPDispatcher.OnRecursiveDNSServerOption. func (n *ndpDispatcher) OnRecursiveDNSServerOption(nicID tcpip.NICID, addrs []tcpip.Address, lifetime time.Duration) { if c := n.rdnssC; c != nil { c <- ndpRDNSSEvent{ @@ -274,7 +274,7 @@ func (n *ndpDispatcher) OnRecursiveDNSServerOption(nicID tcpip.NICID, addrs []tc } } -// Implements stack.NDPDispatcher.OnDNSSearchListOption. +// Implements ipv6.NDPDispatcher.OnDNSSearchListOption. func (n *ndpDispatcher) OnDNSSearchListOption(nicID tcpip.NICID, domainNames []string, lifetime time.Duration) { if n.dnsslC != nil { n.dnsslC <- ndpDNSSLEvent{ @@ -285,8 +285,8 @@ func (n *ndpDispatcher) OnDNSSearchListOption(nicID tcpip.NICID, domainNames []s } } -// Implements stack.NDPDispatcher.OnDHCPv6Configuration. -func (n *ndpDispatcher) OnDHCPv6Configuration(nicID tcpip.NICID, configuration stack.DHCPv6ConfigurationFromNDPRA) { +// Implements ipv6.NDPDispatcher.OnDHCPv6Configuration. +func (n *ndpDispatcher) OnDHCPv6Configuration(nicID tcpip.NICID, configuration ipv6.DHCPv6ConfigurationFromNDPRA) { if c := n.dhcpv6ConfigurationC; c != nil { c <- ndpDHCPv6Event{ nicID, @@ -319,13 +319,12 @@ func TestDADDisabled(t *testing.T) { ndpDisp := ndpDispatcher{ dadC: make(chan ndpDADEvent, 1), } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPDisp: &ndpDisp, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) + s := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPDisp: &ndpDisp, + })}, + }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } @@ -413,19 +412,21 @@ func TestDADResolve(t *testing.T) { ndpDisp := ndpDispatcher{ dadC: make(chan ndpDADEvent), } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPDisp: &ndpDisp, - } - opts.NDPConfigs.RetransmitTimer = test.retransTimer - opts.NDPConfigs.DupAddrDetectTransmits = test.dupAddrDetectTransmits e := channelLinkWithHeaderLength{ Endpoint: channel.New(int(test.dupAddrDetectTransmits), 1280, linkAddr1), headerLength: test.linkHeaderLen, } e.Endpoint.LinkEPCapabilities |= stack.CapabilityResolutionRequired - s := stack.New(opts) + s := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPDisp: &ndpDisp, + NDPConfigs: ipv6.NDPConfigurations{ + RetransmitTimer: test.retransTimer, + DupAddrDetectTransmits: test.dupAddrDetectTransmits, + }, + })}, + }) if err := s.CreateNIC(nicID, &e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } @@ -558,6 +559,26 @@ func TestDADResolve(t *testing.T) { } } +func rxNDPSolicit(e *channel.Endpoint, tgt tcpip.Address) { + hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborSolicitMinimumSize) + pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborSolicitMinimumSize)) + pkt.SetType(header.ICMPv6NeighborSolicit) + ns := header.NDPNeighborSolicit(pkt.NDPPayload()) + ns.SetTargetAddress(tgt) + snmc := header.SolicitedNodeAddr(tgt) + pkt.SetChecksum(header.ICMPv6Checksum(pkt, header.IPv6Any, snmc, buffer.VectorisedView{})) + payloadLength := hdr.UsedLength() + ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize)) + ip.Encode(&header.IPv6Fields{ + PayloadLength: uint16(payloadLength), + NextHeader: uint8(icmp.ProtocolNumber6), + HopLimit: 255, + SrcAddr: header.IPv6Any, + DstAddr: snmc, + }) + e.InjectInbound(header.IPv6ProtocolNumber, stack.NewPacketBuffer(stack.PacketBufferOptions{Data: hdr.View().ToVectorisedView()})) +} + // TestDADFail tests to make sure that the DAD process fails if another node is // detected to be performing DAD on the same address (receive an NS message from // a node doing DAD for the same address), or if another node is detected to own @@ -567,39 +588,19 @@ func TestDADFail(t *testing.T) { tests := []struct { name string - makeBuf func(tgt tcpip.Address) buffer.Prependable + rxPkt func(e *channel.Endpoint, tgt tcpip.Address) getStat func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter }{ { - "RxSolicit", - func(tgt tcpip.Address) buffer.Prependable { - hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborSolicitMinimumSize) - pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborSolicitMinimumSize)) - pkt.SetType(header.ICMPv6NeighborSolicit) - ns := header.NDPNeighborSolicit(pkt.NDPPayload()) - ns.SetTargetAddress(tgt) - snmc := header.SolicitedNodeAddr(tgt) - pkt.SetChecksum(header.ICMPv6Checksum(pkt, header.IPv6Any, snmc, buffer.VectorisedView{})) - payloadLength := hdr.UsedLength() - ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize)) - ip.Encode(&header.IPv6Fields{ - PayloadLength: uint16(payloadLength), - NextHeader: uint8(icmp.ProtocolNumber6), - HopLimit: 255, - SrcAddr: header.IPv6Any, - DstAddr: snmc, - }) - - return hdr - - }, - func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { + name: "RxSolicit", + rxPkt: rxNDPSolicit, + getStat: func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { return s.NeighborSolicit }, }, { - "RxAdvert", - func(tgt tcpip.Address) buffer.Prependable { + name: "RxAdvert", + rxPkt: func(e *channel.Endpoint, tgt tcpip.Address) { naSize := header.ICMPv6NeighborAdvertMinimumSize + header.NDPLinkLayerAddressSize hdr := buffer.NewPrependable(header.IPv6MinimumSize + naSize) pkt := header.ICMPv6(hdr.Prepend(naSize)) @@ -621,11 +622,9 @@ func TestDADFail(t *testing.T) { SrcAddr: tgt, DstAddr: header.IPv6AllNodesMulticastAddress, }) - - return hdr - + e.InjectInbound(header.IPv6ProtocolNumber, stack.NewPacketBuffer(stack.PacketBufferOptions{Data: hdr.View().ToVectorisedView()})) }, - func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { + getStat: func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { return s.NeighborAdvert }, }, @@ -636,16 +635,16 @@ func TestDADFail(t *testing.T) { ndpDisp := ndpDispatcher{ dadC: make(chan ndpDADEvent, 1), } - ndpConfigs := stack.DefaultNDPConfigurations() - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - } - opts.NDPConfigs.RetransmitTimer = time.Second * 2 + ndpConfigs := ipv6.DefaultNDPConfigurations() + ndpConfigs.RetransmitTimer = time.Second * 2 e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) + s := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPDisp: &ndpDisp, + NDPConfigs: ndpConfigs, + })}, + }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } @@ -664,13 +663,8 @@ func TestDADFail(t *testing.T) { t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) } - // Receive a packet to simulate multiple nodes owning or - // attempting to own the same address. - hdr := test.makeBuf(addr1) - pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{ - Data: hdr.View().ToVectorisedView(), - }) - e.InjectInbound(header.IPv6ProtocolNumber, pkt) + // Receive a packet to simulate an address conflict. + test.rxPkt(e, addr1) stat := test.getStat(s.Stats().ICMP.V6PacketsReceived) if got := stat.Value(); got != 1 { @@ -754,18 +748,19 @@ func TestDADStop(t *testing.T) { ndpDisp := ndpDispatcher{ dadC: make(chan ndpDADEvent, 1), } - ndpConfigs := stack.NDPConfigurations{ + + ndpConfigs := ipv6.NDPConfigurations{ RetransmitTimer: time.Second, DupAddrDetectTransmits: 2, } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPDisp: &ndpDisp, - NDPConfigs: ndpConfigs, - } e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) + s := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPDisp: &ndpDisp, + NDPConfigs: ndpConfigs, + })}, + }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _): %s", nicID, err) } @@ -815,19 +810,6 @@ func TestDADStop(t *testing.T) { } } -// TestSetNDPConfigurationFailsForBadNICID tests to make sure we get an error if -// we attempt to update NDP configurations using an invalid NICID. -func TestSetNDPConfigurationFailsForBadNICID(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - }) - - // No NIC with ID 1 yet. - if got := s.SetNDPConfigurations(1, stack.NDPConfigurations{}); got != tcpip.ErrUnknownNICID { - t.Fatalf("got s.SetNDPConfigurations = %v, want = %s", got, tcpip.ErrUnknownNICID) - } -} - // TestSetNDPConfigurations tests that we can update and use per-interface NDP // configurations without affecting the default NDP configurations or other // interfaces' configurations. @@ -863,8 +845,9 @@ func TestSetNDPConfigurations(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPDisp: &ndpDisp, + })}, }) expectDADEvent := func(nicID tcpip.NICID, addr tcpip.Address) { @@ -892,12 +875,15 @@ func TestSetNDPConfigurations(t *testing.T) { } // Update the NDP configurations on NIC(1) to use DAD. - configs := stack.NDPConfigurations{ + configs := ipv6.NDPConfigurations{ DupAddrDetectTransmits: test.dupAddrDetectTransmits, RetransmitTimer: test.retransmitTimer, } - if err := s.SetNDPConfigurations(nicID1, configs); err != nil { - t.Fatalf("got SetNDPConfigurations(%d, _) = %s", nicID1, err) + if ipv6Ep, err := s.GetNetworkEndpoint(nicID1, header.IPv6ProtocolNumber); err != nil { + t.Fatalf("s.GetNetworkEndpoint(%d, %d): %s", nicID1, header.IPv6ProtocolNumber, err) + } else { + ndpEP := ipv6Ep.(ipv6.NDPEndpoint) + ndpEP.SetNDPConfigurations(configs) } // Created after updating NIC(1)'s NDP configurations @@ -1113,12 +1099,13 @@ func TestNoRouterDiscovery(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - DiscoverDefaultRouters: discover, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: handle, + DiscoverDefaultRouters: discover, + }, + NDPDisp: &ndpDisp, + })}, }) s.SetForwarding(ipv6.ProtocolNumber, forwarding) @@ -1151,12 +1138,13 @@ func TestRouterDiscoveryDispatcherNoRemember(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1192,12 +1180,13 @@ func TestRouterDiscovery(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: true, + }, + NDPDisp: &ndpDisp, + })}, }) expectRouterEvent := func(addr tcpip.Address, discovered bool) { @@ -1285,7 +1274,7 @@ func TestRouterDiscovery(t *testing.T) { } // TestRouterDiscoveryMaxRouters tests that only -// stack.MaxDiscoveredDefaultRouters discovered routers are remembered. +// ipv6.MaxDiscoveredDefaultRouters discovered routers are remembered. func TestRouterDiscoveryMaxRouters(t *testing.T) { ndpDisp := ndpDispatcher{ routerC: make(chan ndpRouterEvent, 1), @@ -1293,12 +1282,13 @@ func TestRouterDiscoveryMaxRouters(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1306,14 +1296,14 @@ func TestRouterDiscoveryMaxRouters(t *testing.T) { } // Receive an RA from 2 more than the max number of discovered routers. - for i := 1; i <= stack.MaxDiscoveredDefaultRouters+2; i++ { + for i := 1; i <= ipv6.MaxDiscoveredDefaultRouters+2; i++ { linkAddr := []byte{2, 2, 3, 4, 5, 0} linkAddr[5] = byte(i) llAddr := header.LinkLocalAddr(tcpip.LinkAddress(linkAddr)) e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr, 5)) - if i <= stack.MaxDiscoveredDefaultRouters { + if i <= ipv6.MaxDiscoveredDefaultRouters { select { case e := <-ndpDisp.routerC: if diff := checkRouterEvent(e, llAddr, true); diff != "" { @@ -1358,12 +1348,13 @@ func TestNoPrefixDiscovery(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - DiscoverOnLinkPrefixes: discover, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: handle, + DiscoverOnLinkPrefixes: discover, + }, + NDPDisp: &ndpDisp, + })}, }) s.SetForwarding(ipv6.ProtocolNumber, forwarding) @@ -1399,13 +1390,14 @@ func TestPrefixDiscoveryDispatcherNoRemember(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: false, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: false, + DiscoverOnLinkPrefixes: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1445,12 +1437,13 @@ func TestPrefixDiscovery(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverOnLinkPrefixes: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1545,12 +1538,13 @@ func TestPrefixDiscoveryWithInfiniteLifetime(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverOnLinkPrefixes: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1621,33 +1615,34 @@ func TestPrefixDiscoveryWithInfiniteLifetime(t *testing.T) { } // TestPrefixDiscoveryMaxRouters tests that only -// stack.MaxDiscoveredOnLinkPrefixes discovered on-link prefixes are remembered. +// ipv6.MaxDiscoveredOnLinkPrefixes discovered on-link prefixes are remembered. func TestPrefixDiscoveryMaxOnLinkPrefixes(t *testing.T) { ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, stack.MaxDiscoveredOnLinkPrefixes+3), + prefixC: make(chan ndpPrefixEvent, ipv6.MaxDiscoveredOnLinkPrefixes+3), rememberPrefix: true, } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: false, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: false, + DiscoverOnLinkPrefixes: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { t.Fatalf("CreateNIC(1) = %s", err) } - optSer := make(header.NDPOptionsSerializer, stack.MaxDiscoveredOnLinkPrefixes+2) - prefixes := [stack.MaxDiscoveredOnLinkPrefixes + 2]tcpip.Subnet{} + optSer := make(header.NDPOptionsSerializer, ipv6.MaxDiscoveredOnLinkPrefixes+2) + prefixes := [ipv6.MaxDiscoveredOnLinkPrefixes + 2]tcpip.Subnet{} // Receive an RA with 2 more than the max number of discovered on-link // prefixes. - for i := 0; i < stack.MaxDiscoveredOnLinkPrefixes+2; i++ { + for i := 0; i < ipv6.MaxDiscoveredOnLinkPrefixes+2; i++ { prefixAddr := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0} prefixAddr[7] = byte(i) prefix := tcpip.AddressWithPrefix{ @@ -1665,8 +1660,8 @@ func TestPrefixDiscoveryMaxOnLinkPrefixes(t *testing.T) { } e.InjectInbound(header.IPv6ProtocolNumber, raBufWithOpts(llAddr1, 0, optSer)) - for i := 0; i < stack.MaxDiscoveredOnLinkPrefixes+2; i++ { - if i < stack.MaxDiscoveredOnLinkPrefixes { + for i := 0; i < ipv6.MaxDiscoveredOnLinkPrefixes+2; i++ { + if i < ipv6.MaxDiscoveredOnLinkPrefixes { select { case e := <-ndpDisp.prefixC: if diff := checkPrefixEvent(e, prefixes[i], true); diff != "" { @@ -1716,12 +1711,13 @@ func TestNoAutoGenAddr(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - AutoGenGlobalAddresses: autogen, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: handle, + AutoGenGlobalAddresses: autogen, + }, + NDPDisp: &ndpDisp, + })}, }) s.SetForwarding(ipv6.ProtocolNumber, forwarding) @@ -1749,14 +1745,14 @@ func checkAutoGenAddrEvent(e ndpAutoGenAddrEvent, addr tcpip.AddressWithPrefix, // TestAutoGenAddr tests that an address is properly generated and invalidated // when configured to do so. -func TestAutoGenAddr(t *testing.T) { +func TestAutoGenAddr2(t *testing.T) { const newMinVL = 2 newMinVLDuration := newMinVL * time.Second - saved := stack.MinPrefixInformationValidLifetimeForUpdate + saved := ipv6.MinPrefixInformationValidLifetimeForUpdate defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved + ipv6.MinPrefixInformationValidLifetimeForUpdate = saved }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration + ipv6.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) @@ -1766,12 +1762,13 @@ func TestAutoGenAddr(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -1876,14 +1873,14 @@ func TestAutoGenTempAddr(t *testing.T) { newMinVLDuration = newMinVL * time.Second ) - savedMinPrefixInformationValidLifetimeForUpdate := stack.MinPrefixInformationValidLifetimeForUpdate - savedMaxDesync := stack.MaxDesyncFactor + savedMinPrefixInformationValidLifetimeForUpdate := ipv6.MinPrefixInformationValidLifetimeForUpdate + savedMaxDesync := ipv6.MaxDesyncFactor defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = savedMinPrefixInformationValidLifetimeForUpdate - stack.MaxDesyncFactor = savedMaxDesync + ipv6.MinPrefixInformationValidLifetimeForUpdate = savedMinPrefixInformationValidLifetimeForUpdate + ipv6.MaxDesyncFactor = savedMaxDesync }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration - stack.MaxDesyncFactor = time.Nanosecond + ipv6.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration + ipv6.MaxDesyncFactor = time.Nanosecond prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) @@ -1931,16 +1928,17 @@ func TestAutoGenTempAddr(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: test.dupAddrTransmits, - RetransmitTimer: test.retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - TempIIDSeed: seed, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + DupAddrDetectTransmits: test.dupAddrTransmits, + RetransmitTimer: test.retransmitTimer, + HandleRAs: true, + AutoGenGlobalAddresses: true, + AutoGenTempGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + TempIIDSeed: seed, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { @@ -2119,11 +2117,11 @@ func TestAutoGenTempAddr(t *testing.T) { func TestNoAutoGenTempAddrForLinkLocal(t *testing.T) { const nicID = 1 - savedMaxDesyncFactor := stack.MaxDesyncFactor + savedMaxDesyncFactor := ipv6.MaxDesyncFactor defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor + ipv6.MaxDesyncFactor = savedMaxDesyncFactor }() - stack.MaxDesyncFactor = time.Nanosecond + ipv6.MaxDesyncFactor = time.Nanosecond tests := []struct { name string @@ -2160,12 +2158,13 @@ func TestNoAutoGenTempAddrForLinkLocal(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - AutoGenIPv6LinkLocal: true, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + AutoGenTempGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + AutoGenIPv6LinkLocal: true, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { @@ -2211,11 +2210,11 @@ func TestNoAutoGenTempAddrWithoutStableAddr(t *testing.T) { retransmitTimer = 2 * time.Second ) - savedMaxDesyncFactor := stack.MaxDesyncFactor + savedMaxDesyncFactor := ipv6.MaxDesyncFactor defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor + ipv6.MaxDesyncFactor = savedMaxDesyncFactor }() - stack.MaxDesyncFactor = 0 + ipv6.MaxDesyncFactor = 0 prefix, _, addr := prefixSubnetAddr(0, linkAddr1) var tempIIDHistory [header.IIDSize]byte @@ -2228,15 +2227,16 @@ func TestNoAutoGenTempAddrWithoutStableAddr(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + DupAddrDetectTransmits: dadTransmits, + RetransmitTimer: retransmitTimer, + HandleRAs: true, + AutoGenGlobalAddresses: true, + AutoGenTempGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { @@ -2294,17 +2294,17 @@ func TestAutoGenTempAddrRegen(t *testing.T) { newMinVLDuration = newMinVL * time.Second ) - savedMaxDesyncFactor := stack.MaxDesyncFactor - savedMinMaxTempAddrPreferredLifetime := stack.MinMaxTempAddrPreferredLifetime - savedMinMaxTempAddrValidLifetime := stack.MinMaxTempAddrValidLifetime + savedMaxDesyncFactor := ipv6.MaxDesyncFactor + savedMinMaxTempAddrPreferredLifetime := ipv6.MinMaxTempAddrPreferredLifetime + savedMinMaxTempAddrValidLifetime := ipv6.MinMaxTempAddrValidLifetime defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - stack.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime - stack.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime + ipv6.MaxDesyncFactor = savedMaxDesyncFactor + ipv6.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime + ipv6.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime }() - stack.MaxDesyncFactor = 0 - stack.MinMaxTempAddrPreferredLifetime = newMinVLDuration - stack.MinMaxTempAddrValidLifetime = newMinVLDuration + ipv6.MaxDesyncFactor = 0 + ipv6.MinMaxTempAddrPreferredLifetime = newMinVLDuration + ipv6.MinMaxTempAddrValidLifetime = newMinVLDuration prefix, _, addr := prefixSubnetAddr(0, linkAddr1) var tempIIDHistory [header.IIDSize]byte @@ -2317,16 +2317,17 @@ func TestAutoGenTempAddrRegen(t *testing.T) { autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), } e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ + ndpConfigs := ipv6.NDPConfigurations{ HandleRAs: true, AutoGenGlobalAddresses: true, AutoGenTempGlobalAddresses: true, RegenAdvanceDuration: newMinVLDuration - regenAfter, } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ndpConfigs, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { @@ -2382,8 +2383,11 @@ func TestAutoGenTempAddrRegen(t *testing.T) { // Stop generating temporary addresses ndpConfigs.AutoGenTempGlobalAddresses = false - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) + if ipv6Ep, err := s.GetNetworkEndpoint(nicID, header.IPv6ProtocolNumber); err != nil { + t.Fatalf("s.GetNetworkEndpoint(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) + } else { + ndpEP := ipv6Ep.(ipv6.NDPEndpoint) + ndpEP.SetNDPConfigurations(ndpConfigs) } // Wait for all the temporary addresses to get invalidated. @@ -2439,17 +2443,17 @@ func TestAutoGenTempAddrRegenJobUpdates(t *testing.T) { newMinVLDuration = newMinVL * time.Second ) - savedMaxDesyncFactor := stack.MaxDesyncFactor - savedMinMaxTempAddrPreferredLifetime := stack.MinMaxTempAddrPreferredLifetime - savedMinMaxTempAddrValidLifetime := stack.MinMaxTempAddrValidLifetime + savedMaxDesyncFactor := ipv6.MaxDesyncFactor + savedMinMaxTempAddrPreferredLifetime := ipv6.MinMaxTempAddrPreferredLifetime + savedMinMaxTempAddrValidLifetime := ipv6.MinMaxTempAddrValidLifetime defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - stack.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime - stack.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime + ipv6.MaxDesyncFactor = savedMaxDesyncFactor + ipv6.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime + ipv6.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime }() - stack.MaxDesyncFactor = 0 - stack.MinMaxTempAddrPreferredLifetime = newMinVLDuration - stack.MinMaxTempAddrValidLifetime = newMinVLDuration + ipv6.MaxDesyncFactor = 0 + ipv6.MinMaxTempAddrPreferredLifetime = newMinVLDuration + ipv6.MinMaxTempAddrValidLifetime = newMinVLDuration prefix, _, addr := prefixSubnetAddr(0, linkAddr1) var tempIIDHistory [header.IIDSize]byte @@ -2462,16 +2466,17 @@ func TestAutoGenTempAddrRegenJobUpdates(t *testing.T) { autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), } e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ + ndpConfigs := ipv6.NDPConfigurations{ HandleRAs: true, AutoGenGlobalAddresses: true, AutoGenTempGlobalAddresses: true, RegenAdvanceDuration: newMinVLDuration - regenAfter, } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ndpConfigs, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { @@ -2545,9 +2550,12 @@ func TestAutoGenTempAddrRegenJobUpdates(t *testing.T) { // as paased. ndpConfigs.MaxTempAddrValidLifetime = 100 * time.Second ndpConfigs.MaxTempAddrPreferredLifetime = 100 * time.Second - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) + ipv6Ep, err := s.GetNetworkEndpoint(nicID, header.IPv6ProtocolNumber) + if err != nil { + t.Fatalf("s.GetNetworkEndpoint(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) } + ndpEP := ipv6Ep.(ipv6.NDPEndpoint) + ndpEP.SetNDPConfigurations(ndpConfigs) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) select { case e := <-ndpDisp.autoGenAddrC: @@ -2565,9 +2573,7 @@ func TestAutoGenTempAddrRegenJobUpdates(t *testing.T) { newLifetimes := newMinVLDuration + regenAfter + defaultAsyncNegativeEventTimeout ndpConfigs.MaxTempAddrValidLifetime = newLifetimes ndpConfigs.MaxTempAddrPreferredLifetime = newLifetimes - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) - } + ndpEP.SetNDPConfigurations(ndpConfigs) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) expectAutoGenAddrEventAsync(tempAddr3, newAddr, regenAfter+defaultAsyncPositiveEventTimeout) } @@ -2655,20 +2661,21 @@ func TestMixedSLAACAddrConflictRegen(t *testing.T) { autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), } e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ + ndpConfigs := ipv6.NDPConfigurations{ HandleRAs: true, AutoGenGlobalAddresses: true, AutoGenTempGlobalAddresses: test.tempAddrs, AutoGenAddressConflictRetries: 1, } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ndpConfigs, + NDPDisp: &ndpDisp, + OpaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{ + NICNameFromID: test.nicNameFromID, + }, + })}, TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: test.nicNameFromID, - }, }) s.SetRouteTable([]tcpip.Route{{ @@ -2739,8 +2746,11 @@ func TestMixedSLAACAddrConflictRegen(t *testing.T) { ndpDisp.dadC = make(chan ndpDADEvent, 2) ndpConfigs.DupAddrDetectTransmits = dupAddrTransmits ndpConfigs.RetransmitTimer = retransmitTimer - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) + if ipv6Ep, err := s.GetNetworkEndpoint(nicID, header.IPv6ProtocolNumber); err != nil { + t.Fatalf("s.GetNetworkEndpoint(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) + } else { + ndpEP := ipv6Ep.(ipv6.NDPEndpoint) + ndpEP.SetNDPConfigurations(ndpConfigs) } // Do SLAAC for prefix. @@ -2754,9 +2764,7 @@ func TestMixedSLAACAddrConflictRegen(t *testing.T) { // DAD failure to restart the local generation process. addr := test.addrs[maxSLAACAddrLocalRegenAttempts-1] expectAutoGenAddrAsyncEvent(addr, newAddr) - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } + rxNDPSolicit(e, addr.Address) select { case e := <-ndpDisp.dadC: if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" { @@ -2794,14 +2802,15 @@ func stackAndNdpDispatcherWithDefaultRoute(t *testing.T, nicID tcpip.NICID, useN } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: ndpDisp, + })}, TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: ndpDisp, - UseNeighborCache: useNeighborCache, + UseNeighborCache: useNeighborCache, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) @@ -3036,11 +3045,11 @@ func TestAutoGenAddrJobDeprecation(t *testing.T) { for _, stackTyp := range stacks { t.Run(stackTyp.name, func(t *testing.T) { - saved := stack.MinPrefixInformationValidLifetimeForUpdate + saved := ipv6.MinPrefixInformationValidLifetimeForUpdate defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved + ipv6.MinPrefixInformationValidLifetimeForUpdate = saved }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration + ipv6.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) @@ -3258,12 +3267,12 @@ func TestAutoGenAddrFiniteToInfiniteToFiniteVL(t *testing.T) { const infiniteVLSeconds = 2 const minVLSeconds = 1 savedIL := header.NDPInfiniteLifetime - savedMinVL := stack.MinPrefixInformationValidLifetimeForUpdate + savedMinVL := ipv6.MinPrefixInformationValidLifetimeForUpdate defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = savedMinVL + ipv6.MinPrefixInformationValidLifetimeForUpdate = savedMinVL header.NDPInfiniteLifetime = savedIL }() - stack.MinPrefixInformationValidLifetimeForUpdate = minVLSeconds * time.Second + ipv6.MinPrefixInformationValidLifetimeForUpdate = minVLSeconds * time.Second header.NDPInfiniteLifetime = infiniteVLSeconds * time.Second prefix, _, addr := prefixSubnetAddr(0, linkAddr1) @@ -3307,12 +3316,13 @@ func TestAutoGenAddrFiniteToInfiniteToFiniteVL(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -3357,11 +3367,11 @@ func TestAutoGenAddrFiniteToInfiniteToFiniteVL(t *testing.T) { func TestAutoGenAddrValidLifetimeUpdates(t *testing.T) { const infiniteVL = 4294967295 const newMinVL = 4 - saved := stack.MinPrefixInformationValidLifetimeForUpdate + saved := ipv6.MinPrefixInformationValidLifetimeForUpdate defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved + ipv6.MinPrefixInformationValidLifetimeForUpdate = saved }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVL * time.Second + ipv6.MinPrefixInformationValidLifetimeForUpdate = newMinVL * time.Second prefix, _, addr := prefixSubnetAddr(0, linkAddr1) @@ -3449,12 +3459,13 @@ func TestAutoGenAddrValidLifetimeUpdates(t *testing.T) { } e := channel.New(10, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -3515,12 +3526,13 @@ func TestAutoGenAddrRemoval(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -3700,12 +3712,13 @@ func TestAutoGenAddrStaticConflict(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { @@ -3781,18 +3794,19 @@ func TestAutoGenAddrWithOpaqueIID(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, }, - SecretKey: secretKey, - }, + NDPDisp: &ndpDisp, + OpaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{ + NICNameFromID: func(_ tcpip.NICID, nicName string) string { + return nicName + }, + SecretKey: secretKey, + }, + })}, }) opts := stack.NICOptions{Name: nicName} if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { @@ -3856,11 +3870,11 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { const lifetimeSeconds = 10 // Needed for the temporary address sub test. - savedMaxDesync := stack.MaxDesyncFactor + savedMaxDesync := ipv6.MaxDesyncFactor defer func() { - stack.MaxDesyncFactor = savedMaxDesync + ipv6.MaxDesyncFactor = savedMaxDesync }() - stack.MaxDesyncFactor = time.Nanosecond + ipv6.MaxDesyncFactor = time.Nanosecond var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte secretKey := secretKeyBuf[:] @@ -3938,14 +3952,14 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { addrTypes := []struct { name string - ndpConfigs stack.NDPConfigurations + ndpConfigs ipv6.NDPConfigurations autoGenLinkLocal bool prepareFn func(t *testing.T, ndpDisp *ndpDispatcher, e *channel.Endpoint, tempIIDHistory []byte) []tcpip.AddressWithPrefix addrGenFn func(dadCounter uint8, tempIIDHistory []byte) tcpip.AddressWithPrefix }{ { name: "Global address", - ndpConfigs: stack.NDPConfigurations{ + ndpConfigs: ipv6.NDPConfigurations{ DupAddrDetectTransmits: dadTransmits, RetransmitTimer: retransmitTimer, HandleRAs: true, @@ -3963,7 +3977,7 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { }, { name: "LinkLocal address", - ndpConfigs: stack.NDPConfigurations{ + ndpConfigs: ipv6.NDPConfigurations{ DupAddrDetectTransmits: dadTransmits, RetransmitTimer: retransmitTimer, }, @@ -3977,7 +3991,7 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { }, { name: "Temporary address", - ndpConfigs: stack.NDPConfigurations{ + ndpConfigs: ipv6.NDPConfigurations{ DupAddrDetectTransmits: dadTransmits, RetransmitTimer: retransmitTimer, HandleRAs: true, @@ -4029,16 +4043,17 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { ndpConfigs := addrType.ndpConfigs ndpConfigs.AutoGenAddressConflictRetries = maxRetries s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, + NDPConfigs: ndpConfigs, + NDPDisp: &ndpDisp, + OpaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{ + NICNameFromID: func(_ tcpip.NICID, nicName string) string { + return nicName + }, + SecretKey: secretKey, }, - SecretKey: secretKey, - }, + })}, }) opts := stack.NICOptions{Name: nicName} if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { @@ -4059,9 +4074,7 @@ func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { } // Simulate a DAD conflict. - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } + rxNDPSolicit(e, addr.Address) expectAutoGenAddrEvent(t, &ndpDisp, addr, invalidatedAddr) expectDADEvent(t, &ndpDisp, addr.Address, false) @@ -4119,14 +4132,14 @@ func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) { addrTypes := []struct { name string - ndpConfigs stack.NDPConfigurations + ndpConfigs ipv6.NDPConfigurations autoGenLinkLocal bool subnet tcpip.Subnet triggerSLAACFn func(e *channel.Endpoint) }{ { name: "Global address", - ndpConfigs: stack.NDPConfigurations{ + ndpConfigs: ipv6.NDPConfigurations{ DupAddrDetectTransmits: dadTransmits, RetransmitTimer: retransmitTimer, HandleRAs: true, @@ -4142,7 +4155,7 @@ func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) { }, { name: "LinkLocal address", - ndpConfigs: stack.NDPConfigurations{ + ndpConfigs: ipv6.NDPConfigurations{ DupAddrDetectTransmits: dadTransmits, RetransmitTimer: retransmitTimer, AutoGenAddressConflictRetries: maxRetries, @@ -4165,10 +4178,11 @@ func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, - NDPConfigs: addrType.ndpConfigs, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, + NDPConfigs: addrType.ndpConfigs, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) @@ -4198,9 +4212,7 @@ func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) { expectAutoGenAddrEvent(addr, newAddr) // Simulate a DAD conflict. - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } + rxNDPSolicit(e, addr.Address) expectAutoGenAddrEvent(addr, invalidatedAddr) select { case e := <-ndpDisp.dadC: @@ -4250,21 +4262,22 @@ func TestAutoGenAddrContinuesLifetimesAfterRetry(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenAddressConflictRetries: maxRetries, - }, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + DupAddrDetectTransmits: dadTransmits, + RetransmitTimer: retransmitTimer, + HandleRAs: true, + AutoGenGlobalAddresses: true, + AutoGenAddressConflictRetries: maxRetries, }, - SecretKey: secretKey, - }, + NDPDisp: &ndpDisp, + OpaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{ + NICNameFromID: func(_ tcpip.NICID, nicName string) string { + return nicName + }, + SecretKey: secretKey, + }, + })}, }) opts := stack.NICOptions{Name: nicName} if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { @@ -4296,9 +4309,7 @@ func TestAutoGenAddrContinuesLifetimesAfterRetry(t *testing.T) { // Simulate a DAD conflict after some time has passed. time.Sleep(failureTimer) - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } + rxNDPSolicit(e, addr.Address) expectAutoGenAddrEvent(addr, invalidatedAddr) select { case e := <-ndpDisp.dadC: @@ -4459,11 +4470,12 @@ func TestNDPRecursiveDNSServerDispatch(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(1, e); err != nil { t.Fatalf("CreateNIC(1) = %s", err) @@ -4509,11 +4521,12 @@ func TestNDPDNSSearchListDispatch(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) @@ -4694,15 +4707,16 @@ func TestCleanupNDPState(t *testing.T) { autoGenAddrC: make(chan ndpAutoGenAddrEvent, test.maxAutoGenAddrEvents), } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - AutoGenIPv6LinkLocal: true, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - DiscoverOnLinkPrefixes: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + AutoGenIPv6LinkLocal: true, + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + DiscoverDefaultRouters: true, + DiscoverOnLinkPrefixes: true, + AutoGenGlobalAddresses: true, + }, + NDPDisp: &ndpDisp, + })}, }) expectRouterEvent := func() (bool, ndpRouterEvent) { @@ -4967,18 +4981,19 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { } e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + }, + NDPDisp: &ndpDisp, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } - expectDHCPv6Event := func(configuration stack.DHCPv6ConfigurationFromNDPRA) { + expectDHCPv6Event := func(configuration ipv6.DHCPv6ConfigurationFromNDPRA) { t.Helper() select { case e := <-ndpDisp.dhcpv6ConfigurationC: @@ -5002,7 +5017,7 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { // Even if the first RA reports no DHCPv6 configurations are available, the // dispatcher should get an event. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectDHCPv6Event(stack.DHCPv6NoConfiguration) + expectDHCPv6Event(ipv6.DHCPv6NoConfiguration) // Receiving the same update again should not result in an event to the // dispatcher. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) @@ -5011,19 +5026,19 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { // Receive an RA that updates the DHCPv6 configuration to Other // Configurations. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) + expectDHCPv6Event(ipv6.DHCPv6OtherConfigurations) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) expectNoDHCPv6Event() // Receive an RA that updates the DHCPv6 configuration to Managed Address. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, false)) - expectDHCPv6Event(stack.DHCPv6ManagedAddress) + expectDHCPv6Event(ipv6.DHCPv6ManagedAddress) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, false)) expectNoDHCPv6Event() // Receive an RA that updates the DHCPv6 configuration to none. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectDHCPv6Event(stack.DHCPv6NoConfiguration) + expectDHCPv6Event(ipv6.DHCPv6NoConfiguration) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) expectNoDHCPv6Event() @@ -5031,7 +5046,7 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { // // Note, when the M flag is set, the O flag is redundant. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, true)) - expectDHCPv6Event(stack.DHCPv6ManagedAddress) + expectDHCPv6Event(ipv6.DHCPv6ManagedAddress) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, true)) expectNoDHCPv6Event() // Even though the DHCPv6 flags are different, the effective configuration is @@ -5044,7 +5059,7 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { // Receive an RA that updates the DHCPv6 configuration to Other // Configurations. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) + expectDHCPv6Event(ipv6.DHCPv6OtherConfigurations) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) expectNoDHCPv6Event() @@ -5059,7 +5074,7 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { // Receive an RA that updates the DHCPv6 configuration to Other // Configurations. e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) + expectDHCPv6Event(ipv6.DHCPv6OtherConfigurations) e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) expectNoDHCPv6Event() } @@ -5217,12 +5232,13 @@ func TestRouterSolicitation(t *testing.T) { } } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - MaxRtrSolicitations: test.maxRtrSolicit, - RtrSolicitationInterval: test.rtrSolicitInt, - MaxRtrSolicitationDelay: test.maxRtrSolicitDelay, - }, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + MaxRtrSolicitations: test.maxRtrSolicit, + RtrSolicitationInterval: test.rtrSolicitInt, + MaxRtrSolicitationDelay: test.maxRtrSolicitDelay, + }, + })}, }) if err := s.CreateNIC(nicID, &e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) @@ -5357,12 +5373,13 @@ func TestStopStartSolicitingRouters(t *testing.T) { checker.NDPRS()) } s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - MaxRtrSolicitations: maxRtrSolicitations, - RtrSolicitationInterval: interval, - MaxRtrSolicitationDelay: delay, - }, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + MaxRtrSolicitations: maxRtrSolicitations, + RtrSolicitationInterval: interval, + MaxRtrSolicitationDelay: delay, + }, + })}, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) diff --git a/pkg/tcpip/stack/neighbor_entry.go b/pkg/tcpip/stack/neighbor_entry.go index 213646160..9a72bec79 100644 --- a/pkg/tcpip/stack/neighbor_entry.go +++ b/pkg/tcpip/stack/neighbor_entry.go @@ -21,6 +21,7 @@ import ( "gvisor.dev/gvisor/pkg/sleep" "gvisor.dev/gvisor/pkg/tcpip" + "gvisor.dev/gvisor/pkg/tcpip/header" ) // NeighborEntry describes a neighboring device in the local network. @@ -439,7 +440,7 @@ func (e *neighborEntry) handleConfirmationLocked(linkAddr tcpip.LinkAddress, fla e.notifyWakersLocked() } - if e.isRouter && !flags.IsRouter { + if e.isRouter && !flags.IsRouter && header.IsV6UnicastAddress(e.neigh.Addr) { // "In those cases where the IsRouter flag changes from TRUE to FALSE as // a result of this update, the node MUST remove that router from the // Default Router List and update the Destination Cache entries for all @@ -447,9 +448,17 @@ func (e *neighborEntry) handleConfirmationLocked(linkAddr tcpip.LinkAddress, fla // 7.3.3. This is needed to detect when a node that is used as a router // stops forwarding packets due to being configured as a host." // - RFC 4861 section 7.2.5 - e.nic.mu.Lock() - e.nic.mu.ndp.invalidateDefaultRouter(e.neigh.Addr) - e.nic.mu.Unlock() + // + // TODO(gvisor.dev/issue/4085): Remove the special casing we do for IPv6 + // here. + ep, ok := e.nic.networkEndpoints[header.IPv6ProtocolNumber] + if !ok { + panic(fmt.Sprintf("have a neighbor entry for an IPv6 router but no IPv6 network endpoint")) + } + + if ndpEP, ok := ep.(NDPEndpoint); ok { + ndpEP.InvalidateDefaultRouter(e.neigh.Addr) + } } e.isRouter = flags.IsRouter diff --git a/pkg/tcpip/stack/neighbor_entry_test.go b/pkg/tcpip/stack/neighbor_entry_test.go index e530ec7ea..dcc8363b2 100644 --- a/pkg/tcpip/stack/neighbor_entry_test.go +++ b/pkg/tcpip/stack/neighbor_entry_test.go @@ -28,6 +28,7 @@ import ( "gvisor.dev/gvisor/pkg/sleep" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/faketime" + "gvisor.dev/gvisor/pkg/tcpip/header" ) const ( @@ -233,18 +234,15 @@ func entryTestSetup(c NUDConfigurations) (*neighborEntry, *testNUDDispatcher, *e nudDisp: &disp, }, } + nic.networkEndpoints = map[tcpip.NetworkProtocolNumber]NetworkEndpoint{ + header.IPv6ProtocolNumber: (&testIPv6Protocol{}).NewEndpoint(&nic, nil, nil, nil, nil, nil), + } rng := rand.New(rand.NewSource(time.Now().UnixNano())) nudState := NewNUDState(c, rng) linkRes := entryTestLinkResolver{} entry := newNeighborEntry(&nic, entryTestAddr1 /* remoteAddr */, entryTestAddr2 /* localAddr */, nudState, &linkRes) - // Stub out ndpState to verify modification of default routers. - nic.mu.ndp = ndpState{ - nic: &nic, - defaultRouters: make(map[tcpip.Address]defaultRouterState), - } - // Stub out the neighbor cache to verify deletion from the cache. nic.neigh = &neighborCache{ nic: &nic, @@ -817,6 +815,8 @@ func TestEntryStaysReachableWhenConfirmationWithRouterFlag(t *testing.T) { c := DefaultNUDConfigurations() e, nudDisp, linkRes, _ := entryTestSetup(c) + ipv6EP := e.nic.networkEndpoints[header.IPv6ProtocolNumber].(*testIPv6Endpoint) + e.mu.Lock() e.handlePacketQueuedLocked() e.handleConfirmationLocked(entryTestLinkAddr1, ReachabilityConfirmationFlags{ @@ -830,9 +830,7 @@ func TestEntryStaysReachableWhenConfirmationWithRouterFlag(t *testing.T) { if got, want := e.isRouter, true; got != want { t.Errorf("got e.isRouter = %t, want = %t", got, want) } - e.nic.mu.ndp.defaultRouters[entryTestAddr1] = defaultRouterState{ - invalidationJob: e.nic.stack.newJob(&testLocker{}, func() {}), - } + e.handleConfirmationLocked(entryTestLinkAddr1, ReachabilityConfirmationFlags{ Solicited: false, Override: false, @@ -841,8 +839,8 @@ func TestEntryStaysReachableWhenConfirmationWithRouterFlag(t *testing.T) { if got, want := e.isRouter, false; got != want { t.Errorf("got e.isRouter = %t, want = %t", got, want) } - if _, ok := e.nic.mu.ndp.defaultRouters[entryTestAddr1]; ok { - t.Errorf("unexpected defaultRouter for %s", entryTestAddr1) + if ipv6EP.invalidatedRtr != e.neigh.Addr { + t.Errorf("got ipv6EP.invalidatedRtr = %s, want = %s", ipv6EP.invalidatedRtr, e.neigh.Addr) } e.mu.Unlock() diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go index 2875a5b60..926ce9cfc 100644 --- a/pkg/tcpip/stack/nic.go +++ b/pkg/tcpip/stack/nic.go @@ -18,7 +18,6 @@ import ( "fmt" "math/rand" "reflect" - "sort" "sync/atomic" "gvisor.dev/gvisor/pkg/sleep" @@ -28,13 +27,7 @@ import ( "gvisor.dev/gvisor/pkg/tcpip/header" ) -var ipv4BroadcastAddr = tcpip.ProtocolAddress{ - Protocol: header.IPv4ProtocolNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: header.IPv4Broadcast, - PrefixLen: 8 * header.IPv4AddressSize, - }, -} +var _ NetworkInterface = (*NIC)(nil) // NIC represents a "network interface card" to which the networking stack is // attached. @@ -49,18 +42,18 @@ type NIC struct { neigh *neighborCache networkEndpoints map[tcpip.NetworkProtocolNumber]NetworkEndpoint + // enabled is set to 1 when the NIC is enabled and 0 when it is disabled. + // + // Must be accessed using atomic operations. + enabled uint32 + mu struct { sync.RWMutex - enabled bool spoofing bool promiscuous bool - primary map[tcpip.NetworkProtocolNumber][]*referencedNetworkEndpoint - endpoints map[NetworkEndpointID]*referencedNetworkEndpoint - mcastJoins map[NetworkEndpointID]uint32 // packetEPs is protected by mu, but the contained PacketEndpoint // values are not. packetEPs map[tcpip.NetworkProtocolNumber][]PacketEndpoint - ndp ndpState } } @@ -84,25 +77,6 @@ type DirectionStats struct { Bytes *tcpip.StatCounter } -// PrimaryEndpointBehavior is an enumeration of an endpoint's primacy behavior. -type PrimaryEndpointBehavior int - -const ( - // CanBePrimaryEndpoint indicates the endpoint can be used as a primary - // endpoint for new connections with no local address. This is the - // default when calling NIC.AddAddress. - CanBePrimaryEndpoint PrimaryEndpointBehavior = iota - - // FirstPrimaryEndpoint indicates the endpoint should be the first - // primary endpoint considered. If there are multiple endpoints with - // this behavior, the most recently-added one will be first. - FirstPrimaryEndpoint - - // NeverPrimaryEndpoint indicates the endpoint should never be a - // primary endpoint. - NeverPrimaryEndpoint -) - // newNIC returns a new NIC using the default NDP configurations from stack. func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICContext) *NIC { // TODO(b/141011931): Validate a LinkEndpoint (ep) is valid. For @@ -122,19 +96,7 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICC stats: makeNICStats(), networkEndpoints: make(map[tcpip.NetworkProtocolNumber]NetworkEndpoint), } - nic.mu.primary = make(map[tcpip.NetworkProtocolNumber][]*referencedNetworkEndpoint) - nic.mu.endpoints = make(map[NetworkEndpointID]*referencedNetworkEndpoint) - nic.mu.mcastJoins = make(map[NetworkEndpointID]uint32) nic.mu.packetEPs = make(map[tcpip.NetworkProtocolNumber][]PacketEndpoint) - nic.mu.ndp = ndpState{ - nic: nic, - configs: stack.ndpConfigs, - dad: make(map[tcpip.Address]dadState), - defaultRouters: make(map[tcpip.Address]defaultRouterState), - onLinkPrefixes: make(map[tcpip.Subnet]onLinkPrefixState), - slaacPrefixes: make(map[tcpip.Subnet]slaacPrefixState), - } - nic.mu.ndp.initializeTempAddrState() // Check for Neighbor Unreachability Detection support. var nud NUDHandler @@ -162,7 +124,7 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICC for _, netProto := range stack.networkProtocols { netNum := netProto.Number() nic.mu.packetEPs[netNum] = nil - nic.networkEndpoints[netNum] = netProto.NewEndpoint(id, stack, nud, nic, ep, stack) + nic.networkEndpoints[netNum] = netProto.NewEndpoint(nic, stack, nud, nic, ep, stack) } nic.linkEP.Attach(nic) @@ -170,29 +132,28 @@ func newNIC(stack *Stack, id tcpip.NICID, name string, ep LinkEndpoint, ctx NICC return nic } -// enabled returns true if n is enabled. -func (n *NIC) enabled() bool { - n.mu.RLock() - enabled := n.mu.enabled - n.mu.RUnlock() - return enabled +// Enabled implements NetworkInterface. +func (n *NIC) Enabled() bool { + return atomic.LoadUint32(&n.enabled) == 1 } -// disable disables n. +// setEnabled sets the enabled status for the NIC. // -// It undoes the work done by enable. -func (n *NIC) disable() *tcpip.Error { - n.mu.RLock() - enabled := n.mu.enabled - n.mu.RUnlock() - if !enabled { - return nil +// Returns true if the enabled status was updated. +func (n *NIC) setEnabled(v bool) bool { + if v { + return atomic.SwapUint32(&n.enabled, 1) == 0 } + return atomic.SwapUint32(&n.enabled, 0) == 1 +} +// disable disables n. +// +// It undoes the work done by enable. +func (n *NIC) disable() { n.mu.Lock() - err := n.disableLocked() + n.disableLocked() n.mu.Unlock() - return err } // disableLocked disables n. @@ -200,9 +161,9 @@ func (n *NIC) disable() *tcpip.Error { // It undoes the work done by enable. // // n MUST be locked. -func (n *NIC) disableLocked() *tcpip.Error { - if !n.mu.enabled { - return nil +func (n *NIC) disableLocked() { + if !n.setEnabled(false) { + return } // TODO(gvisor.dev/issue/1491): Should Routes that are currently bound to n be @@ -210,38 +171,9 @@ func (n *NIC) disableLocked() *tcpip.Error { // again, and applications may not know that the underlying NIC was ever // disabled. - if _, ok := n.stack.networkProtocols[header.IPv6ProtocolNumber]; ok { - n.mu.ndp.stopSolicitingRouters() - n.mu.ndp.cleanupState(false /* hostOnly */) - - // Stop DAD for all the unicast IPv6 endpoints that are in the - // permanentTentative state. - for _, r := range n.mu.endpoints { - if addr := r.address(); r.getKind() == permanentTentative && header.IsV6UnicastAddress(addr) { - n.mu.ndp.stopDuplicateAddressDetection(addr) - } - } - - // The NIC may have already left the multicast group. - if err := n.leaveGroupLocked(header.IPv6AllNodesMulticastAddress, false /* force */); err != nil && err != tcpip.ErrBadLocalAddress { - return err - } - } - - if _, ok := n.stack.networkProtocols[header.IPv4ProtocolNumber]; ok { - // The NIC may have already left the multicast group. - if err := n.leaveGroupLocked(header.IPv4AllSystems, false /* force */); err != nil && err != tcpip.ErrBadLocalAddress { - return err - } - - // The address may have already been removed. - if err := n.removePermanentAddressLocked(ipv4BroadcastAddr.AddressWithPrefix.Address); err != nil && err != tcpip.ErrBadLocalAddress { - return err - } + for _, ep := range n.networkEndpoints { + ep.Disable() } - - n.mu.enabled = false - return nil } // enable enables n. @@ -251,162 +183,39 @@ func (n *NIC) disableLocked() *tcpip.Error { // routers if the stack is not operating as a router. If the stack is also // configured to auto-generate a link-local address, one will be generated. func (n *NIC) enable() *tcpip.Error { - n.mu.RLock() - enabled := n.mu.enabled - n.mu.RUnlock() - if enabled { - return nil - } - n.mu.Lock() defer n.mu.Unlock() - if n.mu.enabled { + if !n.setEnabled(true) { return nil } - n.mu.enabled = true - - // Create an endpoint to receive broadcast packets on this interface. - if _, ok := n.stack.networkProtocols[header.IPv4ProtocolNumber]; ok { - if _, err := n.addAddressLocked(ipv4BroadcastAddr, NeverPrimaryEndpoint, permanent, static, false /* deprecated */); err != nil { - return err - } - - // As per RFC 1122 section 3.3.7, all hosts should join the all-hosts - // multicast group. Note, the IANA calls the all-hosts multicast group the - // all-systems multicast group. - if err := n.joinGroupLocked(header.IPv4ProtocolNumber, header.IPv4AllSystems); err != nil { - return err - } - } - - // Join the IPv6 All-Nodes Multicast group if the stack is configured to - // use IPv6. This is required to ensure that this node properly receives - // and responds to the various NDP messages that are destined to the - // all-nodes multicast address. An example is the Neighbor Advertisement - // when we perform Duplicate Address Detection, or Router Advertisement - // when we do Router Discovery. See RFC 4862, section 5.4.2 and RFC 4861 - // section 4.2 for more information. - // - // Also auto-generate an IPv6 link-local address based on the NIC's - // link address if it is configured to do so. Note, each interface is - // required to have IPv6 link-local unicast address, as per RFC 4291 - // section 2.1. - _, ok := n.stack.networkProtocols[header.IPv6ProtocolNumber] - if !ok { - return nil - } - - // Join the All-Nodes multicast group before starting DAD as responses to DAD - // (NDP NS) messages may be sent to the All-Nodes multicast group if the - // source address of the NDP NS is the unspecified address, as per RFC 4861 - // section 7.2.4. - if err := n.joinGroupLocked(header.IPv6ProtocolNumber, header.IPv6AllNodesMulticastAddress); err != nil { - return err - } - - // Perform DAD on the all the unicast IPv6 endpoints that are in the permanent - // state. - // - // Addresses may have aleady completed DAD but in the time since the NIC was - // last enabled, other devices may have acquired the same addresses. - for _, r := range n.mu.endpoints { - addr := r.address() - if k := r.getKind(); (k != permanent && k != permanentTentative) || !header.IsV6UnicastAddress(addr) { - continue - } - - r.setKind(permanentTentative) - if err := n.mu.ndp.startDuplicateAddressDetection(addr, r); err != nil { + for _, ep := range n.networkEndpoints { + if err := ep.Enable(); err != nil { return err } } - // Do not auto-generate an IPv6 link-local address for loopback devices. - if n.stack.autoGenIPv6LinkLocal && !n.isLoopback() { - // The valid and preferred lifetime is infinite for the auto-generated - // link-local address. - n.mu.ndp.doSLAAC(header.IPv6LinkLocalPrefix.Subnet(), header.NDPInfiniteLifetime, header.NDPInfiniteLifetime) - } - - // If we are operating as a router, then do not solicit routers since we - // won't process the RAs anyways. - // - // Routers do not process Router Advertisements (RA) the same way a host - // does. That is, routers do not learn from RAs (e.g. on-link prefixes - // and default routers). Therefore, soliciting RAs from other routers on - // a link is unnecessary for routers. - if !n.stack.Forwarding(header.IPv6ProtocolNumber) { - n.mu.ndp.startSolicitingRouters() - } - return nil } -// remove detaches NIC from the link endpoint, and marks existing referenced -// network endpoints expired. This guarantees no packets between this NIC and -// the network stack. +// remove detaches NIC from the link endpoint and releases network endpoint +// resources. This guarantees no packets between this NIC and the network +// stack. func (n *NIC) remove() *tcpip.Error { n.mu.Lock() defer n.mu.Unlock() n.disableLocked() - // TODO(b/151378115): come up with a better way to pick an error than the - // first one. - var err *tcpip.Error - - // Forcefully leave multicast groups. - for nid := range n.mu.mcastJoins { - if tempErr := n.leaveGroupLocked(nid.LocalAddress, true /* force */); tempErr != nil && err == nil { - err = tempErr - } - } - - // Remove permanent and permanentTentative addresses, so no packet goes out. - for nid, ref := range n.mu.endpoints { - switch ref.getKind() { - case permanentTentative, permanent: - if tempErr := n.removePermanentAddressLocked(nid.LocalAddress); tempErr != nil && err == nil { - err = tempErr - } - } - } - - // Release any resources the network endpoint may hold. for _, ep := range n.networkEndpoints { ep.Close() } + n.networkEndpoints = nil // Detach from link endpoint, so no packet comes in. n.linkEP.Attach(nil) - - return err -} - -// becomeIPv6Router transitions n into an IPv6 router. -// -// When transitioning into an IPv6 router, host-only state (NDP discovered -// routers, discovered on-link prefixes, and auto-generated addresses) will -// be cleaned up/invalidated and NDP router solicitations will be stopped. -func (n *NIC) becomeIPv6Router() { - n.mu.Lock() - defer n.mu.Unlock() - - n.mu.ndp.cleanupState(true /* hostOnly */) - n.mu.ndp.stopSolicitingRouters() -} - -// becomeIPv6Host transitions n into an IPv6 host. -// -// When transitioning into an IPv6 host, NDP router solicitations will be -// started. -func (n *NIC) becomeIPv6Host() { - n.mu.Lock() - defer n.mu.Unlock() - - n.mu.ndp.startSolicitingRouters() + return nil } // setPromiscuousMode enables or disables promiscuous mode. @@ -423,7 +232,8 @@ func (n *NIC) isPromiscuousMode() bool { return rv } -func (n *NIC) isLoopback() bool { +// IsLoopback implements NetworkInterface. +func (n *NIC) IsLoopback() bool { return n.linkEP.Capabilities()&CapabilityLoopback != 0 } @@ -440,200 +250,41 @@ func (n *NIC) setSpoofing(enable bool) { // // If an IPv6 primary endpoint is requested, Source Address Selection (as // defined by RFC 6724 section 5) will be performed. -func (n *NIC) primaryEndpoint(protocol tcpip.NetworkProtocolNumber, remoteAddr tcpip.Address) *referencedNetworkEndpoint { - if protocol == header.IPv6ProtocolNumber && len(remoteAddr) != 0 { - return n.primaryIPv6Endpoint(remoteAddr) - } - +func (n *NIC) primaryEndpoint(protocol tcpip.NetworkProtocolNumber, remoteAddr tcpip.Address) AssignableAddressEndpoint { n.mu.RLock() defer n.mu.RUnlock() - var deprecatedEndpoint *referencedNetworkEndpoint - for _, r := range n.mu.primary[protocol] { - if !r.isValidForOutgoingRLocked() { - continue - } - - if !r.deprecated { - if r.tryIncRef() { - // r is not deprecated, so return it immediately. - // - // If we kept track of a deprecated endpoint, decrement its reference - // count since it was incremented when we decided to keep track of it. - if deprecatedEndpoint != nil { - deprecatedEndpoint.decRefLocked() - deprecatedEndpoint = nil - } - - return r - } - } else if deprecatedEndpoint == nil && r.tryIncRef() { - // We prefer an endpoint that is not deprecated, but we keep track of r in - // case n doesn't have any non-deprecated endpoints. - // - // If we end up finding a more preferred endpoint, r's reference count - // will be decremented when such an endpoint is found. - deprecatedEndpoint = r - } - } - - // n doesn't have any valid non-deprecated endpoints, so return - // deprecatedEndpoint (which may be nil if n doesn't have any valid deprecated - // endpoints either). - return deprecatedEndpoint -} - -// ipv6AddrCandidate is an IPv6 candidate for Source Address Selection (RFC -// 6724 section 5). -type ipv6AddrCandidate struct { - ref *referencedNetworkEndpoint - scope header.IPv6AddressScope -} - -// primaryIPv6Endpoint returns an IPv6 endpoint following Source Address -// Selection (RFC 6724 section 5). -// -// Note, only rules 1-3 and 7 are followed. -// -// remoteAddr must be a valid IPv6 address. -func (n *NIC) primaryIPv6Endpoint(remoteAddr tcpip.Address) *referencedNetworkEndpoint { - n.mu.RLock() - ref := n.primaryIPv6EndpointRLocked(remoteAddr) - n.mu.RUnlock() - return ref -} - -// primaryIPv6EndpointLocked returns an IPv6 endpoint following Source Address -// Selection (RFC 6724 section 5). -// -// Note, only rules 1-3 and 7 are followed. -// -// remoteAddr must be a valid IPv6 address. -// -// n.mu MUST be read locked. -func (n *NIC) primaryIPv6EndpointRLocked(remoteAddr tcpip.Address) *referencedNetworkEndpoint { - primaryAddrs := n.mu.primary[header.IPv6ProtocolNumber] - - if len(primaryAddrs) == 0 { - return nil - } - - // Create a candidate set of available addresses we can potentially use as a - // source address. - cs := make([]ipv6AddrCandidate, 0, len(primaryAddrs)) - for _, r := range primaryAddrs { - // If r is not valid for outgoing connections, it is not a valid endpoint. - if !r.isValidForOutgoingRLocked() { - continue - } - - addr := r.address() - scope, err := header.ScopeForIPv6Address(addr) - if err != nil { - // Should never happen as we got r from the primary IPv6 endpoint list and - // ScopeForIPv6Address only returns an error if addr is not an IPv6 - // address. - panic(fmt.Sprintf("header.ScopeForIPv6Address(%s): %s", addr, err)) - } - - cs = append(cs, ipv6AddrCandidate{ - ref: r, - scope: scope, - }) - } - - remoteScope, err := header.ScopeForIPv6Address(remoteAddr) - if err != nil { - // primaryIPv6Endpoint should never be called with an invalid IPv6 address. - panic(fmt.Sprintf("header.ScopeForIPv6Address(%s): %s", remoteAddr, err)) - } - - // Sort the addresses as per RFC 6724 section 5 rules 1-3. - // - // TODO(b/146021396): Implement rules 4-8 of RFC 6724 section 5. - sort.Slice(cs, func(i, j int) bool { - sa := cs[i] - sb := cs[j] - - // Prefer same address as per RFC 6724 section 5 rule 1. - if sa.ref.address() == remoteAddr { - return true - } - if sb.ref.address() == remoteAddr { - return false - } - - // Prefer appropriate scope as per RFC 6724 section 5 rule 2. - if sa.scope < sb.scope { - return sa.scope >= remoteScope - } else if sb.scope < sa.scope { - return sb.scope < remoteScope - } - - // Avoid deprecated addresses as per RFC 6724 section 5 rule 3. - if saDep, sbDep := sa.ref.deprecated, sb.ref.deprecated; saDep != sbDep { - // If sa is not deprecated, it is preferred over sb. - return sbDep - } - - // Prefer temporary addresses as per RFC 6724 section 5 rule 7. - if saTemp, sbTemp := sa.ref.configType == slaacTemp, sb.ref.configType == slaacTemp; saTemp != sbTemp { - return saTemp - } - - // sa and sb are equal, return the endpoint that is closest to the front of - // the primary endpoint list. - return i < j - }) - - // Return the most preferred address that can have its reference count - // incremented. - for _, c := range cs { - if r := c.ref; r.tryIncRef() { - return r - } - } - - return nil -} - -// hasPermanentAddrLocked returns true if n has a permanent (including currently -// tentative) address, addr. -func (n *NIC) hasPermanentAddrLocked(addr tcpip.Address) bool { - ref, ok := n.mu.endpoints[NetworkEndpointID{addr}] - + ep, ok := n.networkEndpoints[protocol] if !ok { - return false + return nil } - kind := ref.getKind() - - return kind == permanent || kind == permanentTentative + return ep.AcquirePrimaryAddress(remoteAddr, n.mu.spoofing) } -type getRefBehaviour int +type getAddressBehaviour int const ( // spoofing indicates that the NIC's spoofing flag should be observed when - // getting a NIC's referenced network endpoint. - spoofing getRefBehaviour = iota + // getting a NIC's address endpoint. + spoofing getAddressBehaviour = iota // promiscuous indicates that the NIC's promiscuous flag should be observed - // when getting a NIC's referenced network endpoint. + // when getting a NIC's address endpoint. promiscuous ) -func (n *NIC) getRef(protocol tcpip.NetworkProtocolNumber, dst tcpip.Address) *referencedNetworkEndpoint { - return n.getRefOrCreateTemp(protocol, dst, CanBePrimaryEndpoint, promiscuous) +func (n *NIC) getAddress(protocol tcpip.NetworkProtocolNumber, dst tcpip.Address) AssignableAddressEndpoint { + return n.getAddressOrCreateTemp(protocol, dst, CanBePrimaryEndpoint, promiscuous) } // findEndpoint finds the endpoint, if any, with the given address. -func (n *NIC) findEndpoint(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, peb PrimaryEndpointBehavior) *referencedNetworkEndpoint { - return n.getRefOrCreateTemp(protocol, address, peb, spoofing) +func (n *NIC) findEndpoint(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, peb PrimaryEndpointBehavior) AssignableAddressEndpoint { + return n.getAddressOrCreateTemp(protocol, address, peb, spoofing) } -// getRefEpOrCreateTemp returns the referenced network endpoint for the given -// protocol and address. +// getAddressEpOrCreateTemp returns the address endpoint for the given protocol +// and address. // // If none exists a temporary one may be created if we are in promiscuous mode // or spoofing. Promiscuous mode will only be checked if promiscuous is true. @@ -641,9 +292,8 @@ func (n *NIC) findEndpoint(protocol tcpip.NetworkProtocolNumber, address tcpip.A // // If the address is the IPv4 broadcast address for an endpoint's network, that // endpoint will be returned. -func (n *NIC) getRefOrCreateTemp(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, peb PrimaryEndpointBehavior, tempRef getRefBehaviour) *referencedNetworkEndpoint { +func (n *NIC) getAddressOrCreateTemp(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, peb PrimaryEndpointBehavior, tempRef getAddressBehaviour) AssignableAddressEndpoint { n.mu.RLock() - var spoofingOrPromiscuous bool switch tempRef { case spoofing: @@ -651,274 +301,54 @@ func (n *NIC) getRefOrCreateTemp(protocol tcpip.NetworkProtocolNumber, address t case promiscuous: spoofingOrPromiscuous = n.mu.promiscuous } - - if ref, ok := n.mu.endpoints[NetworkEndpointID{address}]; ok { - // An endpoint with this id exists, check if it can be used and return it. - if !ref.isAssignedRLocked(spoofingOrPromiscuous) { - n.mu.RUnlock() - return nil - } - - if ref.tryIncRef() { - n.mu.RUnlock() - return ref - } - } - - if protocol == header.IPv4ProtocolNumber { - if ref := n.getIPv4RefForBroadcastOrLoopbackRLocked(address); ref != nil { - n.mu.RUnlock() - return ref - } - } n.mu.RUnlock() - - if !spoofingOrPromiscuous { - return nil - } - - // Try again with the lock in exclusive mode. If we still can't get the - // endpoint, create a new "temporary" endpoint. It will only exist while - // there's a route through it. - n.mu.Lock() - ref := n.getRefOrCreateTempLocked(protocol, address, peb) - n.mu.Unlock() - return ref + return n.getAddressOrCreateTempInner(protocol, address, spoofingOrPromiscuous, peb) } -// getRefForBroadcastOrLoopbackRLocked returns an endpoint whose address is the -// broadcast address for the endpoint's network or an address in the endpoint's -// subnet if the NIC is a loopback interface. This matches linux behaviour. -// -// n.mu MUST be read or write locked. -func (n *NIC) getIPv4RefForBroadcastOrLoopbackRLocked(address tcpip.Address) *referencedNetworkEndpoint { - for _, ref := range n.mu.endpoints { - // Only IPv4 has a notion of broadcast addresses or considers the loopback - // interface bound to an address's whole subnet (on linux). - if ref.protocol != header.IPv4ProtocolNumber { - continue - } - - subnet := ref.addrWithPrefix().Subnet() - if (subnet.IsBroadcast(address) || (n.isLoopback() && subnet.Contains(address))) && ref.isValidForOutgoingRLocked() && ref.tryIncRef() { - return ref - } +// getAddressOrCreateTempInner is like getAddressEpOrCreateTemp except a boolean +// is passed to indicate whether or not we should generate temporary endpoints. +func (n *NIC) getAddressOrCreateTempInner(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, createTemp bool, peb PrimaryEndpointBehavior) AssignableAddressEndpoint { + if ep, ok := n.networkEndpoints[protocol]; ok { + return ep.AcquireAssignedAddress(address, createTemp, peb) } return nil } -/// getRefOrCreateTempLocked returns an existing endpoint for address or creates -/// and returns a temporary endpoint. -// -// If the address is the IPv4 broadcast address for an endpoint's network, that -// endpoint will be returned. -// -// n.mu must be write locked. -func (n *NIC) getRefOrCreateTempLocked(protocol tcpip.NetworkProtocolNumber, address tcpip.Address, peb PrimaryEndpointBehavior) *referencedNetworkEndpoint { - if ref, ok := n.mu.endpoints[NetworkEndpointID{address}]; ok { - // No need to check the type as we are ok with expired endpoints at this - // point. - if ref.tryIncRef() { - return ref - } - // tryIncRef failing means the endpoint is scheduled to be removed once the - // lock is released. Remove it here so we can create a new (temporary) one. - // The removal logic waiting for the lock handles this case. - n.removeEndpointLocked(ref) - } - - if protocol == header.IPv4ProtocolNumber { - if ref := n.getIPv4RefForBroadcastOrLoopbackRLocked(address); ref != nil { - return ref - } - } - - // Add a new temporary endpoint. - netProto, ok := n.stack.networkProtocols[protocol] - if !ok { - return nil - } - ref, _ := n.addAddressLocked(tcpip.ProtocolAddress{ - Protocol: protocol, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: address, - PrefixLen: netProto.DefaultPrefixLen(), - }, - }, peb, temporary, static, false) - return ref -} - -// addAddressLocked adds a new protocolAddress to n. -// -// If n already has the address in a non-permanent state, and the kind given is -// permanent, that address will be promoted in place and its properties set to -// the properties provided. Otherwise, it returns tcpip.ErrDuplicateAddress. -func (n *NIC) addAddressLocked(protocolAddress tcpip.ProtocolAddress, peb PrimaryEndpointBehavior, kind networkEndpointKind, configType networkEndpointConfigType, deprecated bool) (*referencedNetworkEndpoint, *tcpip.Error) { - // TODO(b/141022673): Validate IP addresses before adding them. - - // Sanity check. - id := NetworkEndpointID{LocalAddress: protocolAddress.AddressWithPrefix.Address} - if ref, ok := n.mu.endpoints[id]; ok { - // Endpoint already exists. - if kind != permanent { - return nil, tcpip.ErrDuplicateAddress - } - switch ref.getKind() { - case permanentTentative, permanent: - // The NIC already have a permanent endpoint with that address. - return nil, tcpip.ErrDuplicateAddress - case permanentExpired, temporary: - // Promote the endpoint to become permanent and respect the new peb, - // configType and deprecated status. - if ref.tryIncRef() { - // TODO(b/147748385): Perform Duplicate Address Detection when promoting - // an IPv6 endpoint to permanent. - ref.setKind(permanent) - ref.deprecated = deprecated - ref.configType = configType - - refs := n.mu.primary[ref.protocol] - for i, r := range refs { - if r == ref { - switch peb { - case CanBePrimaryEndpoint: - return ref, nil - case FirstPrimaryEndpoint: - if i == 0 { - return ref, nil - } - n.mu.primary[r.protocol] = append(refs[:i], refs[i+1:]...) - case NeverPrimaryEndpoint: - n.mu.primary[r.protocol] = append(refs[:i], refs[i+1:]...) - return ref, nil - } - } - } - - n.insertPrimaryEndpointLocked(ref, peb) - - return ref, nil - } - // tryIncRef failing means the endpoint is scheduled to be removed once - // the lock is released. Remove it here so we can create a new - // (permanent) one. The removal logic waiting for the lock handles this - // case. - n.removeEndpointLocked(ref) - } - } - +// addAddress adds a new address to n, so that it starts accepting packets +// targeted at the given address (and network protocol). +func (n *NIC) addAddress(protocolAddress tcpip.ProtocolAddress, peb PrimaryEndpointBehavior) *tcpip.Error { ep, ok := n.networkEndpoints[protocolAddress.Protocol] if !ok { - return nil, tcpip.ErrUnknownProtocol - } - - isIPv6Unicast := protocolAddress.Protocol == header.IPv6ProtocolNumber && header.IsV6UnicastAddress(protocolAddress.AddressWithPrefix.Address) - - // If the address is an IPv6 address and it is a permanent address, - // mark it as tentative so it goes through the DAD process if the NIC is - // enabled. If the NIC is not enabled, DAD will be started when the NIC is - // enabled. - if isIPv6Unicast && kind == permanent { - kind = permanentTentative + return tcpip.ErrUnknownProtocol } - ref := &referencedNetworkEndpoint{ - refs: 1, - addr: protocolAddress.AddressWithPrefix, - ep: ep, - nic: n, - protocol: protocolAddress.Protocol, - kind: kind, - configType: configType, - deprecated: deprecated, + addressEndpoint, err := ep.AddAndAcquirePermanentAddress(protocolAddress.AddressWithPrefix, peb, AddressConfigStatic, false /* deprecated */) + if err == nil { + // We have no need for the address endpoint. + addressEndpoint.DecRef() } - - // Set up resolver if link address resolution exists for this protocol. - if n.linkEP.Capabilities()&CapabilityResolutionRequired != 0 { - if linkRes, ok := n.stack.linkAddrResolvers[protocolAddress.Protocol]; ok { - ref.linkCache = n.stack - ref.linkRes = linkRes - } - } - - // If we are adding an IPv6 unicast address, join the solicited-node - // multicast address. - if isIPv6Unicast { - snmc := header.SolicitedNodeAddr(protocolAddress.AddressWithPrefix.Address) - if err := n.joinGroupLocked(protocolAddress.Protocol, snmc); err != nil { - return nil, err - } - } - - n.mu.endpoints[id] = ref - - n.insertPrimaryEndpointLocked(ref, peb) - - // If we are adding a tentative IPv6 address, start DAD if the NIC is enabled. - if isIPv6Unicast && kind == permanentTentative && n.mu.enabled { - if err := n.mu.ndp.startDuplicateAddressDetection(protocolAddress.AddressWithPrefix.Address, ref); err != nil { - return nil, err - } - } - - return ref, nil -} - -// AddAddress adds a new address to n, so that it starts accepting packets -// targeted at the given address (and network protocol). -func (n *NIC) AddAddress(protocolAddress tcpip.ProtocolAddress, peb PrimaryEndpointBehavior) *tcpip.Error { - // Add the endpoint. - n.mu.Lock() - _, err := n.addAddressLocked(protocolAddress, peb, permanent, static, false /* deprecated */) - n.mu.Unlock() - return err } -// AllAddresses returns all addresses (primary and non-primary) associated with +// allPermanentAddresses returns all permanent addresses associated with // this NIC. -func (n *NIC) AllAddresses() []tcpip.ProtocolAddress { - n.mu.RLock() - defer n.mu.RUnlock() - - addrs := make([]tcpip.ProtocolAddress, 0, len(n.mu.endpoints)) - for _, ref := range n.mu.endpoints { - // Don't include tentative, expired or temporary endpoints to - // avoid confusion and prevent the caller from using those. - switch ref.getKind() { - case permanentExpired, temporary: - continue +func (n *NIC) allPermanentAddresses() []tcpip.ProtocolAddress { + var addrs []tcpip.ProtocolAddress + for p, ep := range n.networkEndpoints { + for _, a := range ep.PermanentAddresses() { + addrs = append(addrs, tcpip.ProtocolAddress{Protocol: p, AddressWithPrefix: a}) } - - addrs = append(addrs, tcpip.ProtocolAddress{ - Protocol: ref.protocol, - AddressWithPrefix: ref.addrWithPrefix(), - }) } return addrs } -// PrimaryAddresses returns the primary addresses associated with this NIC. -func (n *NIC) PrimaryAddresses() []tcpip.ProtocolAddress { - n.mu.RLock() - defer n.mu.RUnlock() - +// primaryAddresses returns the primary addresses associated with this NIC. +func (n *NIC) primaryAddresses() []tcpip.ProtocolAddress { var addrs []tcpip.ProtocolAddress - for proto, list := range n.mu.primary { - for _, ref := range list { - // Don't include tentative, expired or tempory endpoints - // to avoid confusion and prevent the caller from using - // those. - switch ref.getKind() { - case permanentTentative, permanentExpired, temporary: - continue - } - - addrs = append(addrs, tcpip.ProtocolAddress{ - Protocol: proto, - AddressWithPrefix: ref.addrWithPrefix(), - }) + for p, ep := range n.networkEndpoints { + for _, a := range ep.PrimaryAddresses() { + addrs = append(addrs, tcpip.ProtocolAddress{Protocol: p, AddressWithPrefix: a}) } } return addrs @@ -930,147 +360,26 @@ func (n *NIC) PrimaryAddresses() []tcpip.ProtocolAddress { // address exists. If no non-deprecated address exists, the first deprecated // address will be returned. func (n *NIC) primaryAddress(proto tcpip.NetworkProtocolNumber) tcpip.AddressWithPrefix { - n.mu.RLock() - defer n.mu.RUnlock() - - list, ok := n.mu.primary[proto] - if !ok { + addressEndpoint := n.primaryEndpoint(proto, "") + if addressEndpoint == nil { return tcpip.AddressWithPrefix{} } - - var deprecatedEndpoint *referencedNetworkEndpoint - for _, ref := range list { - // Don't include tentative, expired or tempory endpoints to avoid confusion - // and prevent the caller from using those. - switch ref.getKind() { - case permanentTentative, permanentExpired, temporary: - continue - } - - if !ref.deprecated { - return ref.addrWithPrefix() - } - - if deprecatedEndpoint == nil { - deprecatedEndpoint = ref - } - } - - if deprecatedEndpoint != nil { - return deprecatedEndpoint.addrWithPrefix() - } - - return tcpip.AddressWithPrefix{} -} - -// insertPrimaryEndpointLocked adds r to n's primary endpoint list as required -// by peb. -// -// n MUST be locked. -func (n *NIC) insertPrimaryEndpointLocked(r *referencedNetworkEndpoint, peb PrimaryEndpointBehavior) { - switch peb { - case CanBePrimaryEndpoint: - n.mu.primary[r.protocol] = append(n.mu.primary[r.protocol], r) - case FirstPrimaryEndpoint: - n.mu.primary[r.protocol] = append([]*referencedNetworkEndpoint{r}, n.mu.primary[r.protocol]...) - } -} - -func (n *NIC) removeEndpointLocked(r *referencedNetworkEndpoint) { - id := NetworkEndpointID{LocalAddress: r.address()} - - // Nothing to do if the reference has already been replaced with a different - // one. This happens in the case where 1) this endpoint's ref count hit zero - // and was waiting (on the lock) to be removed and 2) the same address was - // re-added in the meantime by removing this endpoint from the list and - // adding a new one. - if n.mu.endpoints[id] != r { - return - } - - if r.getKind() == permanent { - panic("Reference count dropped to zero before being removed") - } - - delete(n.mu.endpoints, id) - refs := n.mu.primary[r.protocol] - for i, ref := range refs { - if ref == r { - n.mu.primary[r.protocol] = append(refs[:i], refs[i+1:]...) - refs[len(refs)-1] = nil - break - } - } -} - -func (n *NIC) removeEndpoint(r *referencedNetworkEndpoint) { - n.mu.Lock() - n.removeEndpointLocked(r) - n.mu.Unlock() -} - -func (n *NIC) removePermanentAddressLocked(addr tcpip.Address) *tcpip.Error { - r, ok := n.mu.endpoints[NetworkEndpointID{addr}] - if !ok { - return tcpip.ErrBadLocalAddress - } - - kind := r.getKind() - if kind != permanent && kind != permanentTentative { - return tcpip.ErrBadLocalAddress - } - - switch r.protocol { - case header.IPv6ProtocolNumber: - return n.removePermanentIPv6EndpointLocked(r, true /* allowSLAACInvalidation */) - default: - r.expireLocked() - return nil - } + addr := addressEndpoint.AddressWithPrefix() + addressEndpoint.DecRef() + return addr } -func (n *NIC) removePermanentIPv6EndpointLocked(r *referencedNetworkEndpoint, allowSLAACInvalidation bool) *tcpip.Error { - addr := r.addrWithPrefix() - - isIPv6Unicast := header.IsV6UnicastAddress(addr.Address) - - if isIPv6Unicast { - n.mu.ndp.stopDuplicateAddressDetection(addr.Address) - - // If we are removing an address generated via SLAAC, cleanup - // its SLAAC resources and notify the integrator. - switch r.configType { - case slaac: - n.mu.ndp.cleanupSLAACAddrResourcesAndNotify(addr, allowSLAACInvalidation) - case slaacTemp: - n.mu.ndp.cleanupTempSLAACAddrResourcesAndNotify(addr, allowSLAACInvalidation) - } - } - - r.expireLocked() - - // At this point the endpoint is deleted. - - // If we are removing an IPv6 unicast address, leave the solicited-node - // multicast address. - // - // We ignore the tcpip.ErrBadLocalAddress error because the solicited-node - // multicast group may be left by user action. - if isIPv6Unicast { - snmc := header.SolicitedNodeAddr(addr.Address) - if err := n.leaveGroupLocked(snmc, false /* force */); err != nil && err != tcpip.ErrBadLocalAddress { +// removeAddress removes an address from n. +func (n *NIC) removeAddress(addr tcpip.Address) *tcpip.Error { + for _, ep := range n.networkEndpoints { + if err := ep.RemovePermanentAddress(addr); err == tcpip.ErrBadLocalAddress { + continue + } else { return err } } - return nil -} - -// RemoveAddress removes an address from n. -func (n *NIC) RemoveAddress(addr tcpip.Address) *tcpip.Error { - n.mu.Lock() - defer n.mu.Unlock() - return n.removePermanentAddressLocked(addr) + return tcpip.ErrBadLocalAddress } func (n *NIC) neighbors() ([]NeighborEntry, *tcpip.Error) { @@ -1121,91 +430,66 @@ func (n *NIC) clearNeighbors() *tcpip.Error { // joinGroup adds a new endpoint for the given multicast address, if none // exists yet. Otherwise it just increments its count. func (n *NIC) joinGroup(protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) *tcpip.Error { - n.mu.Lock() - defer n.mu.Unlock() - - return n.joinGroupLocked(protocol, addr) -} - -// joinGroupLocked adds a new endpoint for the given multicast address, if none -// exists yet. Otherwise it just increments its count. n MUST be locked before -// joinGroupLocked is called. -func (n *NIC) joinGroupLocked(protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) *tcpip.Error { // TODO(b/143102137): When implementing MLD, make sure MLD packets are // not sent unless a valid link-local address is available for use on n // as an MLD packet's source address must be a link-local address as // outlined in RFC 3810 section 5. - id := NetworkEndpointID{addr} - joins := n.mu.mcastJoins[id] - if joins == 0 { - netProto, ok := n.stack.networkProtocols[protocol] - if !ok { - return tcpip.ErrUnknownProtocol - } - if _, err := n.addAddressLocked(tcpip.ProtocolAddress{ - Protocol: protocol, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: addr, - PrefixLen: netProto.DefaultPrefixLen(), - }, - }, NeverPrimaryEndpoint, permanent, static, false /* deprecated */); err != nil { - return err - } + ep, ok := n.networkEndpoints[protocol] + if !ok { + return tcpip.ErrNotSupported } - n.mu.mcastJoins[id] = joins + 1 - return nil + + gep, ok := ep.(GroupAddressableEndpoint) + if !ok { + return tcpip.ErrNotSupported + } + + _, err := gep.JoinGroup(addr) + return err } // leaveGroup decrements the count for the given multicast address, and when it // reaches zero removes the endpoint for this address. -func (n *NIC) leaveGroup(addr tcpip.Address) *tcpip.Error { - n.mu.Lock() - defer n.mu.Unlock() - - return n.leaveGroupLocked(addr, false /* force */) -} +func (n *NIC) leaveGroup(protocol tcpip.NetworkProtocolNumber, addr tcpip.Address) *tcpip.Error { + ep, ok := n.networkEndpoints[protocol] + if !ok { + return tcpip.ErrNotSupported + } -// leaveGroupLocked decrements the count for the given multicast address, and -// when it reaches zero removes the endpoint for this address. n MUST be locked -// before leaveGroupLocked is called. -// -// If force is true, then the count for the multicast addres is ignored and the -// endpoint will be removed immediately. -func (n *NIC) leaveGroupLocked(addr tcpip.Address, force bool) *tcpip.Error { - id := NetworkEndpointID{addr} - joins, ok := n.mu.mcastJoins[id] + gep, ok := ep.(GroupAddressableEndpoint) if !ok { - // There are no joins with this address on this NIC. - return tcpip.ErrBadLocalAddress + return tcpip.ErrNotSupported } - joins-- - if force || joins == 0 { - // There are no outstanding joins or we are forced to leave, clean up. - delete(n.mu.mcastJoins, id) - return n.removePermanentAddressLocked(addr) + if _, err := gep.LeaveGroup(addr); err != nil { + return err } - n.mu.mcastJoins[id] = joins return nil } // isInGroup returns true if n has joined the multicast group addr. func (n *NIC) isInGroup(addr tcpip.Address) bool { - n.mu.RLock() - joins := n.mu.mcastJoins[NetworkEndpointID{addr}] - n.mu.RUnlock() + for _, ep := range n.networkEndpoints { + gep, ok := ep.(GroupAddressableEndpoint) + if !ok { + continue + } + + if gep.IsInGroup(addr) { + return true + } + } - return joins != 0 + return false } -func handlePacket(protocol tcpip.NetworkProtocolNumber, dst, src tcpip.Address, localLinkAddr, remotelinkAddr tcpip.LinkAddress, ref *referencedNetworkEndpoint, pkt *PacketBuffer) { - r := makeRoute(protocol, dst, src, localLinkAddr, ref, false /* handleLocal */, false /* multicastLoop */) +func (n *NIC) handlePacket(protocol tcpip.NetworkProtocolNumber, dst, src tcpip.Address, remotelinkAddr tcpip.LinkAddress, addressEndpoint AssignableAddressEndpoint, pkt *PacketBuffer) { + r := makeRoute(protocol, dst, src, n, addressEndpoint, false /* handleLocal */, false /* multicastLoop */) r.RemoteLinkAddress = remotelinkAddr - - ref.ep.HandlePacket(&r, pkt) - ref.decRef() + addressEndpoint.NetworkEndpoint().HandlePacket(&r, pkt) + addressEndpoint.DecRef() } // DeliverNetworkPacket finds the appropriate network protocol endpoint and @@ -1216,7 +500,7 @@ func handlePacket(protocol tcpip.NetworkProtocolNumber, dst, src tcpip.Address, // the ownership of the items is not retained by the caller. func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) { n.mu.RLock() - enabled := n.mu.enabled + enabled := n.Enabled() // If the NIC is not yet enabled, don't receive any packets. if !enabled { n.mu.RUnlock() @@ -1274,17 +558,21 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp src, dst := netProto.ParseAddresses(pkt.NetworkHeader().View()) - if n.stack.handleLocal && !n.isLoopback() && n.getRef(protocol, src) != nil { - // The source address is one of our own, so we never should have gotten a - // packet like this unless handleLocal is false. Loopback also calls this - // function even though the packets didn't come from the physical interface - // so don't drop those. - n.stack.stats.IP.InvalidSourceAddressesReceived.Increment() - return + if n.stack.handleLocal && !n.IsLoopback() { + if r := n.getAddress(protocol, src); r != nil { + r.DecRef() + + // The source address is one of our own, so we never should have gotten a + // packet like this unless handleLocal is false. Loopback also calls this + // function even though the packets didn't come from the physical interface + // so don't drop those. + n.stack.stats.IP.InvalidSourceAddressesReceived.Increment() + return + } } // Loopback traffic skips the prerouting chain. - if !n.isLoopback() { + if !n.IsLoopback() { // iptables filtering. ipt := n.stack.IPTables() address := n.primaryAddress(protocol) @@ -1295,8 +583,8 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp } } - if ref := n.getRef(protocol, dst); ref != nil { - handlePacket(protocol, dst, src, n.linkEP.LinkAddress(), remote, ref, pkt) + if addressEndpoint := n.getAddress(protocol, dst); addressEndpoint != nil { + n.handlePacket(protocol, dst, src, remote, addressEndpoint, pkt) return } @@ -1312,20 +600,20 @@ func (n *NIC) DeliverNetworkPacket(remote, local tcpip.LinkAddress, protocol tcp } // Found a NIC. - n := r.ref.nic - n.mu.RLock() - ref, ok := n.mu.endpoints[NetworkEndpointID{dst}] - ok = ok && ref.isValidForOutgoingRLocked() && ref.tryIncRef() - n.mu.RUnlock() - if ok { - r.LocalLinkAddress = n.linkEP.LinkAddress() - r.RemoteLinkAddress = remote - r.RemoteAddress = src - // TODO(b/123449044): Update the source NIC as well. - ref.ep.HandlePacket(&r, pkt) - ref.decRef() - r.Release() - return + n := r.nic + if addressEndpoint := n.getAddressOrCreateTempInner(protocol, dst, false, NeverPrimaryEndpoint); addressEndpoint != nil { + if n.isValidForOutgoing(addressEndpoint) { + r.LocalLinkAddress = n.linkEP.LinkAddress() + r.RemoteLinkAddress = remote + r.RemoteAddress = src + // TODO(b/123449044): Update the source NIC as well. + addressEndpoint.NetworkEndpoint().HandlePacket(&r, pkt) + addressEndpoint.DecRef() + r.Release() + return + } + + addressEndpoint.DecRef() } // n doesn't have a destination endpoint. @@ -1498,96 +786,23 @@ func (n *NIC) DeliverTransportControlPacket(local, remote tcpip.Address, net tcp } } -// ID returns the identifier of n. +// ID implements NetworkInterface. func (n *NIC) ID() tcpip.NICID { return n.id } -// Name returns the name of n. +// Name implements NetworkInterface. func (n *NIC) Name() string { return n.name } -// Stack returns the instance of the Stack that owns this NIC. -func (n *NIC) Stack() *Stack { - return n.stack -} - // LinkEndpoint returns the link endpoint of n. func (n *NIC) LinkEndpoint() LinkEndpoint { return n.linkEP } -// isAddrTentative returns true if addr is tentative on n. -// -// Note that if addr is not associated with n, then this function will return -// false. It will only return true if the address is associated with the NIC -// AND it is tentative. -func (n *NIC) isAddrTentative(addr tcpip.Address) bool { - n.mu.RLock() - defer n.mu.RUnlock() - - ref, ok := n.mu.endpoints[NetworkEndpointID{addr}] - if !ok { - return false - } - - return ref.getKind() == permanentTentative -} - -// dupTentativeAddrDetected attempts to inform n that a tentative addr is a -// duplicate on a link. -// -// dupTentativeAddrDetected will remove the tentative address if it exists. If -// the address was generated via SLAAC, an attempt will be made to generate a -// new address. -func (n *NIC) dupTentativeAddrDetected(addr tcpip.Address) *tcpip.Error { - n.mu.Lock() - defer n.mu.Unlock() - - ref, ok := n.mu.endpoints[NetworkEndpointID{addr}] - if !ok { - return tcpip.ErrBadAddress - } - - if ref.getKind() != permanentTentative { - return tcpip.ErrInvalidEndpointState - } - - // If the address is a SLAAC address, do not invalidate its SLAAC prefix as a - // new address will be generated for it. - if err := n.removePermanentIPv6EndpointLocked(ref, false /* allowSLAACInvalidation */); err != nil { - return err - } - - prefix := ref.addrWithPrefix().Subnet() - - switch ref.configType { - case slaac: - n.mu.ndp.regenerateSLAACAddr(prefix) - case slaacTemp: - // Do not reset the generation attempts counter for the prefix as the - // temporary address is being regenerated in response to a DAD conflict. - n.mu.ndp.regenerateTempSLAACAddr(prefix, false /* resetGenAttempts */) - } - - return nil -} - -// setNDPConfigs sets the NDP configurations for n. -// -// Note, if c contains invalid NDP configuration values, it will be fixed to -// use default values for the erroneous values. -func (n *NIC) setNDPConfigs(c NDPConfigurations) { - c.validate() - - n.mu.Lock() - n.mu.ndp.configs = c - n.mu.Unlock() -} - -// NUDConfigs gets the NUD configurations for n. -func (n *NIC) NUDConfigs() (NUDConfigurations, *tcpip.Error) { +// nudConfigs gets the NUD configurations for n. +func (n *NIC) nudConfigs() (NUDConfigurations, *tcpip.Error) { if n.neigh == nil { return NUDConfigurations{}, tcpip.ErrNotSupported } @@ -1607,49 +822,6 @@ func (n *NIC) setNUDConfigs(c NUDConfigurations) *tcpip.Error { return nil } -// handleNDPRA handles an NDP Router Advertisement message that arrived on n. -func (n *NIC) handleNDPRA(ip tcpip.Address, ra header.NDPRouterAdvert) { - n.mu.Lock() - defer n.mu.Unlock() - - n.mu.ndp.handleRA(ip, ra) -} - -type networkEndpointKind int32 - -const ( - // A permanentTentative endpoint is a permanent address that is not yet - // considered to be fully bound to an interface in the traditional - // sense. That is, the address is associated with a NIC, but packets - // destined to the address MUST NOT be accepted and MUST be silently - // dropped, and the address MUST NOT be used as a source address for - // outgoing packets. For IPv6, addresses will be of this kind until - // NDP's Duplicate Address Detection has resolved, or be deleted if - // the process results in detecting a duplicate address. - permanentTentative networkEndpointKind = iota - - // A permanent endpoint is created by adding a permanent address (vs. a - // temporary one) to the NIC. Its reference count is biased by 1 to avoid - // removal when no route holds a reference to it. It is removed by explicitly - // removing the permanent address from the NIC. - permanent - - // An expired permanent endpoint is a permanent endpoint that had its address - // removed from the NIC, and it is waiting to be removed once no more routes - // hold a reference to it. This is achieved by decreasing its reference count - // by 1. If its address is re-added before the endpoint is removed, its type - // changes back to permanent and its reference count increases by 1 again. - permanentExpired - - // A temporary endpoint is created for spoofing outgoing packets, or when in - // promiscuous mode and accepting incoming packets that don't match any - // permanent endpoint. Its reference count is not biased by 1 and the - // endpoint is removed immediately when no more route holds a reference to - // it. A temporary endpoint can be promoted to permanent if its address - // is added permanently. - temporary -) - func (n *NIC) registerPacketEndpoint(netProto tcpip.NetworkProtocolNumber, ep PacketEndpoint) *tcpip.Error { n.mu.Lock() defer n.mu.Unlock() @@ -1680,153 +852,12 @@ func (n *NIC) unregisterPacketEndpoint(netProto tcpip.NetworkProtocolNumber, ep } } -type networkEndpointConfigType int32 - -const ( - // A statically configured endpoint is an address that was added by - // some user-specified action (adding an explicit address, joining a - // multicast group). - static networkEndpointConfigType = iota - - // A SLAAC configured endpoint is an IPv6 endpoint that was added by - // SLAAC as per RFC 4862 section 5.5.3. - slaac - - // A temporary SLAAC configured endpoint is an IPv6 endpoint that was added by - // SLAAC as per RFC 4941. Temporary SLAAC addresses are short-lived and are - // not expected to be valid (or preferred) forever; hence the term temporary. - slaacTemp -) - -type referencedNetworkEndpoint struct { - ep NetworkEndpoint - addr tcpip.AddressWithPrefix - nic *NIC - protocol tcpip.NetworkProtocolNumber - - // linkCache is set if link address resolution is enabled for this - // protocol. Set to nil otherwise. - linkCache LinkAddressCache - - // linkRes is set if link address resolution is enabled for this protocol. - // Set to nil otherwise. - linkRes LinkAddressResolver - - // refs is counting references held for this endpoint. When refs hits zero it - // triggers the automatic removal of the endpoint from the NIC. - refs int32 - - // networkEndpointKind must only be accessed using {get,set}Kind(). - kind networkEndpointKind - - // configType is the method that was used to configure this endpoint. - // This must never change except during endpoint creation and promotion to - // permanent. - configType networkEndpointConfigType - - // deprecated indicates whether or not the endpoint should be considered - // deprecated. That is, when deprecated is true, other endpoints that are not - // deprecated should be preferred. - deprecated bool -} - -func (r *referencedNetworkEndpoint) address() tcpip.Address { - return r.addr.Address -} - -func (r *referencedNetworkEndpoint) addrWithPrefix() tcpip.AddressWithPrefix { - return r.addr -} - -func (r *referencedNetworkEndpoint) getKind() networkEndpointKind { - return networkEndpointKind(atomic.LoadInt32((*int32)(&r.kind))) -} - -func (r *referencedNetworkEndpoint) setKind(kind networkEndpointKind) { - atomic.StoreInt32((*int32)(&r.kind), int32(kind)) -} - // isValidForOutgoing returns true if the endpoint can be used to send out a // packet. It requires the endpoint to not be marked expired (i.e., its address) // has been removed) unless the NIC is in spoofing mode, or temporary. -func (r *referencedNetworkEndpoint) isValidForOutgoing() bool { - r.nic.mu.RLock() - defer r.nic.mu.RUnlock() - - return r.isValidForOutgoingRLocked() -} - -// isValidForOutgoingRLocked is the same as isValidForOutgoing but requires -// r.nic.mu to be read locked. -func (r *referencedNetworkEndpoint) isValidForOutgoingRLocked() bool { - if !r.nic.mu.enabled { - return false - } - - return r.isAssignedRLocked(r.nic.mu.spoofing) -} - -// isAssignedRLocked returns true if r is considered to be assigned to the NIC. -// -// r.nic.mu must be read locked. -func (r *referencedNetworkEndpoint) isAssignedRLocked(spoofingOrPromiscuous bool) bool { - switch r.getKind() { - case permanentTentative: - return false - case permanentExpired: - return spoofingOrPromiscuous - default: - return true - } -} - -// expireLocked decrements the reference count and marks the permanent endpoint -// as expired. -func (r *referencedNetworkEndpoint) expireLocked() { - r.setKind(permanentExpired) - r.decRefLocked() -} - -// decRef decrements the ref count and cleans up the endpoint once it reaches -// zero. -func (r *referencedNetworkEndpoint) decRef() { - if atomic.AddInt32(&r.refs, -1) == 0 { - r.nic.removeEndpoint(r) - } -} - -// decRefLocked is the same as decRef but assumes that the NIC.mu mutex is -// locked. -func (r *referencedNetworkEndpoint) decRefLocked() { - if atomic.AddInt32(&r.refs, -1) == 0 { - r.nic.removeEndpointLocked(r) - } -} - -// incRef increments the ref count. It must only be called when the caller is -// known to be holding a reference to the endpoint, otherwise tryIncRef should -// be used. -func (r *referencedNetworkEndpoint) incRef() { - atomic.AddInt32(&r.refs, 1) -} - -// tryIncRef attempts to increment the ref count from n to n+1, but only if n is -// not zero. That is, it will increment the count if the endpoint is still -// alive, and do nothing if it has already been clean up. -func (r *referencedNetworkEndpoint) tryIncRef() bool { - for { - v := atomic.LoadInt32(&r.refs) - if v == 0 { - return false - } - - if atomic.CompareAndSwapInt32(&r.refs, v, v+1) { - return true - } - } -} - -// stack returns the Stack instance that owns the underlying endpoint. -func (r *referencedNetworkEndpoint) stack() *Stack { - return r.nic.stack +func (n *NIC) isValidForOutgoing(ep AssignableAddressEndpoint) bool { + n.mu.RLock() + spoofing := n.mu.spoofing + n.mu.RUnlock() + return n.Enabled() && ep.IsAssigned(spoofing) } diff --git a/pkg/tcpip/stack/nic_test.go b/pkg/tcpip/stack/nic_test.go index bc9c9881a..df516aad7 100644 --- a/pkg/tcpip/stack/nic_test.go +++ b/pkg/tcpip/stack/nic_test.go @@ -15,96 +15,40 @@ package stack import ( - "math" "testing" - "time" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/buffer" "gvisor.dev/gvisor/pkg/tcpip/header" ) -var _ LinkEndpoint = (*testLinkEndpoint)(nil) +var _ AddressableEndpoint = (*testIPv6Endpoint)(nil) +var _ NetworkEndpoint = (*testIPv6Endpoint)(nil) +var _ NDPEndpoint = (*testIPv6Endpoint)(nil) -// A LinkEndpoint that throws away outgoing packets. +// An IPv6 NetworkEndpoint that throws away outgoing packets. // -// We use this instead of the channel endpoint as the channel package depends on +// We use this instead of ipv6.endpoint because the ipv6 package depends on // the stack package which this test lives in, causing a cyclic dependency. -type testLinkEndpoint struct { - dispatcher NetworkDispatcher -} - -// Attach implements LinkEndpoint.Attach. -func (e *testLinkEndpoint) Attach(dispatcher NetworkDispatcher) { - e.dispatcher = dispatcher -} - -// IsAttached implements LinkEndpoint.IsAttached. -func (e *testLinkEndpoint) IsAttached() bool { - return e.dispatcher != nil -} - -// MTU implements LinkEndpoint.MTU. -func (*testLinkEndpoint) MTU() uint32 { - return math.MaxUint16 -} - -// Capabilities implements LinkEndpoint.Capabilities. -func (*testLinkEndpoint) Capabilities() LinkEndpointCapabilities { - return CapabilityResolutionRequired -} +type testIPv6Endpoint struct { + AddressableEndpointState -// MaxHeaderLength implements LinkEndpoint.MaxHeaderLength. -func (*testLinkEndpoint) MaxHeaderLength() uint16 { - return 0 -} + nicID tcpip.NICID + linkEP LinkEndpoint + protocol *testIPv6Protocol -// LinkAddress returns the link address of this endpoint. -func (*testLinkEndpoint) LinkAddress() tcpip.LinkAddress { - return "" + invalidatedRtr tcpip.Address } -// Wait implements LinkEndpoint.Wait. -func (*testLinkEndpoint) Wait() {} - -// WritePacket implements LinkEndpoint.WritePacket. -func (e *testLinkEndpoint) WritePacket(*Route, *GSO, tcpip.NetworkProtocolNumber, *PacketBuffer) *tcpip.Error { +func (*testIPv6Endpoint) Enable() *tcpip.Error { return nil } -// WritePackets implements LinkEndpoint.WritePackets. -func (e *testLinkEndpoint) WritePackets(*Route, *GSO, PacketBufferList, tcpip.NetworkProtocolNumber) (int, *tcpip.Error) { - // Our tests don't use this so we don't support it. - return 0, tcpip.ErrNotSupported -} - -// WriteRawPacket implements LinkEndpoint.WriteRawPacket. -func (e *testLinkEndpoint) WriteRawPacket(buffer.VectorisedView) *tcpip.Error { - // Our tests don't use this so we don't support it. - return tcpip.ErrNotSupported -} - -// ARPHardwareType implements stack.LinkEndpoint.ARPHardwareType. -func (*testLinkEndpoint) ARPHardwareType() header.ARPHardwareType { - panic("not implemented") +func (*testIPv6Endpoint) Enabled() bool { + return true } -// AddHeader implements stack.LinkEndpoint.AddHeader. -func (e *testLinkEndpoint) AddHeader(local, remote tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt *PacketBuffer) { - panic("not implemented") -} - -var _ NetworkEndpoint = (*testIPv6Endpoint)(nil) - -// An IPv6 NetworkEndpoint that throws away outgoing packets. -// -// We use this instead of ipv6.endpoint because the ipv6 package depends on -// the stack package which this test lives in, causing a cyclic dependency. -type testIPv6Endpoint struct { - nicID tcpip.NICID - linkEP LinkEndpoint - protocol *testIPv6Protocol -} +func (*testIPv6Endpoint) Disable() {} // DefaultTTL implements NetworkEndpoint.DefaultTTL. func (*testIPv6Endpoint) DefaultTTL() uint8 { @@ -154,13 +98,19 @@ func (*testIPv6Endpoint) HandlePacket(*Route, *PacketBuffer) { } // Close implements NetworkEndpoint.Close. -func (*testIPv6Endpoint) Close() {} +func (e *testIPv6Endpoint) Close() { + e.AddressableEndpointState.Cleanup() +} // NetworkProtocolNumber implements NetworkEndpoint.NetworkProtocolNumber. func (*testIPv6Endpoint) NetworkProtocolNumber() tcpip.NetworkProtocolNumber { return header.IPv6ProtocolNumber } +func (e *testIPv6Endpoint) InvalidateDefaultRouter(rtr tcpip.Address) { + e.invalidatedRtr = rtr +} + var _ NetworkProtocol = (*testIPv6Protocol)(nil) // An IPv6 NetworkProtocol that supports the bare minimum to make a stack @@ -192,12 +142,14 @@ func (*testIPv6Protocol) ParseAddresses(v buffer.View) (src, dst tcpip.Address) } // NewEndpoint implements NetworkProtocol.NewEndpoint. -func (p *testIPv6Protocol) NewEndpoint(nicID tcpip.NICID, _ LinkAddressCache, _ NUDHandler, _ TransportDispatcher, linkEP LinkEndpoint, _ *Stack) NetworkEndpoint { - return &testIPv6Endpoint{ - nicID: nicID, +func (p *testIPv6Protocol) NewEndpoint(nic NetworkInterface, _ LinkAddressCache, _ NUDHandler, _ TransportDispatcher, linkEP LinkEndpoint, _ *Stack) NetworkEndpoint { + e := &testIPv6Endpoint{ + nicID: nic.ID(), linkEP: linkEP, protocol: p, } + e.AddressableEndpointState.Init(e) + return e } // SetOption implements NetworkProtocol.SetOption. @@ -241,42 +193,6 @@ func (*testIPv6Protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAdd return "", false } -func newTestIPv6Protocol(*Stack) NetworkProtocol { - return &testIPv6Protocol{} -} - -// Test the race condition where a NIC is removed and an RS timer fires at the -// same time. -func TestRemoveNICWhileHandlingRSTimer(t *testing.T) { - const ( - nicID = 1 - - maxRtrSolicitations = 5 - ) - - e := testLinkEndpoint{} - s := New(Options{ - NetworkProtocols: []NetworkProtocolFactory{newTestIPv6Protocol}, - NDPConfigs: NDPConfigurations{ - MaxRtrSolicitations: maxRtrSolicitations, - RtrSolicitationInterval: minimumRtrSolicitationInterval, - }, - }) - - if err := s.CreateNIC(nicID, &e); err != nil { - t.Fatalf("s.CreateNIC(%d, _) = %s", nicID, err) - } - - s.mu.Lock() - // Wait for the router solicitation timer to fire and block trying to obtain - // the stack lock when doing link address resolution. - time.Sleep(minimumRtrSolicitationInterval * 2) - if err := s.removeNICLocked(nicID); err != nil { - t.Fatalf("s.removeNICLocked(%d) = %s", nicID, err) - } - s.mu.Unlock() -} - func TestDisabledRxStatsWhenNICDisabled(t *testing.T) { // When the NIC is disabled, the only field that matters is the stats field. // This test is limited to stats counter checks. diff --git a/pkg/tcpip/stack/registration.go b/pkg/tcpip/stack/registration.go index 780a5ebde..ef42fd6e1 100644 --- a/pkg/tcpip/stack/registration.go +++ b/pkg/tcpip/stack/registration.go @@ -15,6 +15,8 @@ package stack import ( + "fmt" + "gvisor.dev/gvisor/pkg/sleep" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/buffer" @@ -259,9 +261,251 @@ type NetworkHeaderParams struct { TOS uint8 } +// GroupAddressableEndpoint is an endpoint that supports group addressing. +// +// An endpoint is considered to support group addressing when one or more +// endpoints may associate themselves with the same identifier (group address). +type GroupAddressableEndpoint interface { + // JoinGroup joins the spcified group. + // + // Returns true if the group was newly joined. + JoinGroup(group tcpip.Address) (bool, *tcpip.Error) + + // LeaveGroup attempts to leave the specified group. + // + // Returns tcpip.ErrBadLocalAddress if the endpoint has not joined the group. + LeaveGroup(group tcpip.Address) (bool, *tcpip.Error) + + // IsInGroup returns true if the endpoint is a member of the specified group. + IsInGroup(group tcpip.Address) bool +} + +// PrimaryEndpointBehavior is an enumeration of an AddressEndpoint's primary +// behavior. +type PrimaryEndpointBehavior int + +const ( + // CanBePrimaryEndpoint indicates the endpoint can be used as a primary + // endpoint for new connections with no local address. This is the + // default when calling NIC.AddAddress. + CanBePrimaryEndpoint PrimaryEndpointBehavior = iota + + // FirstPrimaryEndpoint indicates the endpoint should be the first + // primary endpoint considered. If there are multiple endpoints with + // this behavior, they are ordered by recency. + FirstPrimaryEndpoint + + // NeverPrimaryEndpoint indicates the endpoint should never be a + // primary endpoint. + NeverPrimaryEndpoint +) + +// AddressConfigType is the method used to add an address. +type AddressConfigType int + +const ( + // AddressConfigStatic is a statically configured address endpoint that was + // added by some user-specified action (adding an explicit address, joining a + // multicast group). + AddressConfigStatic AddressConfigType = iota + + // AddressConfigSlaac is an address endpoint added by SLAAC, as per RFC 4862 + // section 5.5.3. + AddressConfigSlaac + + // AddressConfigSlaacTemp is a temporary address endpoint added by SLAAC as + // per RFC 4941. Temporary SLAAC addresses are short-lived and are not + // to be valid (or preferred) forever; hence the term temporary. + AddressConfigSlaacTemp +) + +// AssignableAddressEndpoint is a reference counted address endpoint that may be +// assigned to a NetworkEndpoint. +type AssignableAddressEndpoint interface { + // NetworkEndpoint returns the NetworkEndpoint the receiver is associated + // with. + NetworkEndpoint() NetworkEndpoint + + // AddressWithPrefix returns the endpoint's address. + AddressWithPrefix() tcpip.AddressWithPrefix + + // IsAssigned returns whether or not the endpoint is considered bound + // to its NetworkEndpoint. + IsAssigned(allowExpired bool) bool + + // IncRef increments this endpoint's reference count. + // + // Returns true if it was successfully incremented. If it returns false, then + // the endpoint is considered expired and should no longer be used. + IncRef() bool + + // DecRef decrements this endpoint's reference count. + DecRef() +} + +// AddressEndpoint is an endpoint representing an address assigned to an +// AddressableEndpoint. +type AddressEndpoint interface { + AssignableAddressEndpoint + + // GetKind returns the address kind for this endpoint. + GetKind() AddressKind + + // SetKind sets the address kind for this endpoint. + SetKind(AddressKind) + + // ConfigType returns the method used to add the address. + ConfigType() AddressConfigType + + // Deprecated returns whether or not this endpoint is deprecated. + Deprecated() bool + + // SetDeprecated sets this endpoint's deprecated status. + SetDeprecated(bool) +} + +// AddressKind is the kind of of an address. +// +// See the values of AddressKind for more details. +type AddressKind int + +const ( + // PermanentTentative is a permanent address endpoint that is not yet + // considered to be fully bound to an interface in the traditional + // sense. That is, the address is associated with a NIC, but packets + // destined to the address MUST NOT be accepted and MUST be silently + // dropped, and the address MUST NOT be used as a source address for + // outgoing packets. For IPv6, addresses are of this kind until NDP's + // Duplicate Address Detection (DAD) resolves. If DAD fails, the address + // is removed. + PermanentTentative AddressKind = iota + + // Permanent is a permanent endpoint (vs. a temporary one) assigned to the + // NIC. Its reference count is biased by 1 to avoid removal when no route + // holds a reference to it. It is removed by explicitly removing the address + // from the NIC. + Permanent + + // PermanentExpired is a permanent endpoint that had its address removed from + // the NIC, and it is waiting to be removed once no references to it are held. + // + // If the address is re-added before the endpoint is removed, its type + // changes back to Permanent. + PermanentExpired + + // Temporary is an endpoint, created on a one-off basis to temporarily + // consider the NIC bound an an address that it is not explictiy bound to + // (such as a permanent address). Its reference count must not be biased by 1 + // so that the address is removed immediately when references to it are no + // longer held. + // + // A temporary endpoint may be promoted to permanent if the address is added + // permanently. + Temporary +) + +// IsPermanent returns true if the AddressKind represents a permanent address. +func (k AddressKind) IsPermanent() bool { + switch k { + case Permanent, PermanentTentative: + return true + case Temporary, PermanentExpired: + return false + default: + panic(fmt.Sprintf("unrecognized address kind = %d", k)) + } +} + +// AddressableEndpoint is an endpoint that supports addressing. +// +// An endpoint is considered to support addressing when the endpoint may +// associate itself with an identifier (address). +type AddressableEndpoint interface { + // AddAndAcquirePermanentAddress adds the passed permanent address. + // + // Returns tcpip.ErrDuplicateAddress if the address exists. + // + // Acquires and returns the AddressEndpoint for the added address. + AddAndAcquirePermanentAddress(addr tcpip.AddressWithPrefix, peb PrimaryEndpointBehavior, configType AddressConfigType, deprecated bool) (AddressEndpoint, *tcpip.Error) + + // RemovePermanentAddress removes the passed address if it is a permanent + // address. + // + // Returns tcpip.ErrBadLocalAddress if the endpoint does not have the passed + // permanent address. + RemovePermanentAddress(addr tcpip.Address) *tcpip.Error + + // AcquireAssignedAddress returns an AddressEndpoint for the passed address + // that is considered bound to the endpoint, optionally creating a temporary + // endpoint if requested and no existing address exists. + // + // The returned endpoint's reference count is incremented. + // + // Returns nil if the specified address is not local to this endpoint. + AcquireAssignedAddress(localAddr tcpip.Address, allowTemp bool, tempPEB PrimaryEndpointBehavior) AddressEndpoint + + // AcquirePrimaryAddress returns a primary endpoint to use when communicating + // with the passed remote address. + // + // If allowExpired is true, expired addresses may be returned. + // + // The returned endpoint's reference count is incremented. + // + // Returns nil if a primary endpoint is not available. + AcquirePrimaryAddress(remoteAddr tcpip.Address, allowExpired bool) AddressEndpoint + + // PrimaryAddresses returns the primary addresses. + PrimaryAddresses() []tcpip.AddressWithPrefix + + // PermanentAddresses returns all the permanent addresses. + PermanentAddresses() []tcpip.AddressWithPrefix +} + +// NDPEndpoint is a network endpoint that supports NDP. +type NDPEndpoint interface { + NetworkEndpoint + + // InvalidateDefaultRouter invalidates a default router discovered through + // NDP. + InvalidateDefaultRouter(tcpip.Address) +} + +// NetworkInterface is a network interface. +type NetworkInterface interface { + // ID returns the interface's ID. + ID() tcpip.NICID + + // IsLoopback returns true if the interface is a loopback interface. + IsLoopback() bool + + // Name returns the name of the interface. + // + // May return an empty string if the interface is not configured with a name. + Name() string + + // Enabled returns true if the interface is enabled. + Enabled() bool +} + // NetworkEndpoint is the interface that needs to be implemented by endpoints // of network layer protocols (e.g., ipv4, ipv6). type NetworkEndpoint interface { + AddressableEndpoint + + // Enable enables the endpoint. + // + // Must only be called when the stack is in a state that allows the endpoint + // to send and receive packets. + // + // Returns tcpip.ErrNotPermitted if the endpoint cannot be enabled. + Enable() *tcpip.Error + + // Enabled returns true if the endpoint is enabled. + Enabled() bool + + // Disable disables the endpoint. + Disable() + // DefaultTTL is the default time-to-live value (or hop limit, in ipv6) // for this endpoint. DefaultTTL() uint8 @@ -312,6 +556,17 @@ type NetworkEndpoint interface { NetworkProtocolNumber() tcpip.NetworkProtocolNumber } +// ForwardingNetworkProtocol is a NetworkProtocol that may forward packets. +type ForwardingNetworkProtocol interface { + NetworkProtocol + + // Forwarding returns the forwarding configuration. + Forwarding() bool + + // SetForwarding sets the forwarding configuration. + SetForwarding(bool) +} + // NetworkProtocol is the interface that needs to be implemented by network // protocols (e.g., ipv4, ipv6) that want to be part of the networking stack. type NetworkProtocol interface { @@ -331,7 +586,7 @@ type NetworkProtocol interface { ParseAddresses(v buffer.View) (src, dst tcpip.Address) // NewEndpoint creates a new endpoint of this protocol. - NewEndpoint(nicID tcpip.NICID, linkAddrCache LinkAddressCache, nud NUDHandler, dispatcher TransportDispatcher, sender LinkEndpoint, st *Stack) NetworkEndpoint + NewEndpoint(nic NetworkInterface, linkAddrCache LinkAddressCache, nud NUDHandler, dispatcher TransportDispatcher, sender LinkEndpoint, st *Stack) NetworkEndpoint // SetOption allows enabling/disabling protocol specific features. // SetOption returns an error if the option is not supported or the @@ -460,8 +715,8 @@ type LinkEndpoint interface { // Attach attaches the data link layer endpoint to the network-layer // dispatcher of the stack. // - // Attach will be called with a nil dispatcher if the receiver's associated - // NIC is being removed. + // Attach is called with a nil dispatcher when the endpoint's NIC is being + // removed. Attach(dispatcher NetworkDispatcher) // IsAttached returns whether a NetworkDispatcher is attached to the diff --git a/pkg/tcpip/stack/route.go b/pkg/tcpip/stack/route.go index 2cbbf0de8..1b008a067 100644 --- a/pkg/tcpip/stack/route.go +++ b/pkg/tcpip/stack/route.go @@ -42,17 +42,27 @@ type Route struct { // NetProto is the network-layer protocol. NetProto tcpip.NetworkProtocolNumber - // ref a reference to the network endpoint through which the route - // starts. - ref *referencedNetworkEndpoint - // Loop controls where WritePacket should send packets. Loop PacketLooping + + // nic is the NIC the route goes through. + nic *NIC + + // addressEndpoint is the local address this route is associated with. + addressEndpoint AssignableAddressEndpoint + + // linkCache is set if link address resolution is enabled for this protocol on + // the route's NIC. + linkCache LinkAddressCache + + // linkRes is set if link address resolution is enabled for this protocol on + // the route's NIC. + linkRes LinkAddressResolver } // makeRoute initializes a new route. It takes ownership of the provided -// reference to a network endpoint. -func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip.Address, localLinkAddr tcpip.LinkAddress, ref *referencedNetworkEndpoint, handleLocal, multicastLoop bool) Route { +// AssignableAddressEndpoint. +func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip.Address, nic *NIC, addressEndpoint AssignableAddressEndpoint, handleLocal, multicastLoop bool) Route { loop := PacketOut if handleLocal && localAddr != "" && remoteAddr == localAddr { loop = PacketLoop @@ -62,29 +72,39 @@ func makeRoute(netProto tcpip.NetworkProtocolNumber, localAddr, remoteAddr tcpip loop |= PacketLoop } - return Route{ + r := Route{ NetProto: netProto, LocalAddress: localAddr, - LocalLinkAddress: localLinkAddr, + LocalLinkAddress: nic.linkEP.LinkAddress(), RemoteAddress: remoteAddr, - ref: ref, + addressEndpoint: addressEndpoint, + nic: nic, Loop: loop, } + + if nic := r.nic; nic.linkEP.Capabilities()&CapabilityResolutionRequired != 0 { + if linkRes, ok := nic.stack.linkAddrResolvers[r.NetProto]; ok { + r.linkRes = linkRes + r.linkCache = nic.stack + } + } + + return r } // NICID returns the id of the NIC from which this route originates. func (r *Route) NICID() tcpip.NICID { - return r.ref.ep.NICID() + return r.addressEndpoint.NetworkEndpoint().NICID() } // MaxHeaderLength forwards the call to the network endpoint's implementation. func (r *Route) MaxHeaderLength() uint16 { - return r.ref.ep.MaxHeaderLength() + return r.addressEndpoint.NetworkEndpoint().MaxHeaderLength() } // Stats returns a mutable copy of current stats. func (r *Route) Stats() tcpip.Stats { - return r.ref.nic.stack.Stats() + return r.nic.stack.Stats() } // PseudoHeaderChecksum forwards the call to the network endpoint's @@ -95,12 +115,12 @@ func (r *Route) PseudoHeaderChecksum(protocol tcpip.TransportProtocolNumber, tot // Capabilities returns the link-layer capabilities of the route. func (r *Route) Capabilities() LinkEndpointCapabilities { - return r.ref.ep.Capabilities() + return r.addressEndpoint.NetworkEndpoint().Capabilities() } // GSOMaxSize returns the maximum GSO packet size. func (r *Route) GSOMaxSize() uint32 { - if gso, ok := r.ref.ep.(GSOEndpoint); ok { + if gso, ok := r.addressEndpoint.NetworkEndpoint().(GSOEndpoint); ok { return gso.GSOMaxSize() } return 0 @@ -138,8 +158,8 @@ func (r *Route) Resolve(waker *sleep.Waker) (<-chan struct{}, *tcpip.Error) { nextAddr = r.RemoteAddress } - if r.ref.nic.neigh != nil { - entry, ch, err := r.ref.nic.neigh.entry(nextAddr, r.LocalAddress, r.ref.linkRes, waker) + if neigh := r.nic.neigh; neigh != nil { + entry, ch, err := neigh.entry(nextAddr, r.LocalAddress, r.linkRes, waker) if err != nil { return ch, err } @@ -147,7 +167,7 @@ func (r *Route) Resolve(waker *sleep.Waker) (<-chan struct{}, *tcpip.Error) { return nil, nil } - linkAddr, ch, err := r.ref.linkCache.GetLinkAddress(r.ref.nic.ID(), nextAddr, r.LocalAddress, r.NetProto, waker) + linkAddr, ch, err := r.linkCache.GetLinkAddress(r.nic.ID(), nextAddr, r.LocalAddress, r.NetProto, waker) if err != nil { return ch, err } @@ -162,12 +182,12 @@ func (r *Route) RemoveWaker(waker *sleep.Waker) { nextAddr = r.RemoteAddress } - if r.ref.nic.neigh != nil { - r.ref.nic.neigh.removeWaker(nextAddr, waker) + if neigh := r.nic.neigh; neigh != nil { + neigh.removeWaker(nextAddr, waker) return } - r.ref.linkCache.RemoveWaker(r.ref.nic.ID(), nextAddr, waker) + r.linkCache.RemoveWaker(r.nic.ID(), nextAddr, waker) } // IsResolutionRequired returns true if Resolve() must be called to resolve @@ -175,27 +195,27 @@ func (r *Route) RemoveWaker(waker *sleep.Waker) { // // The NIC r uses must not be locked. func (r *Route) IsResolutionRequired() bool { - if r.ref.nic.neigh != nil { - return r.ref.isValidForOutgoing() && r.ref.linkRes != nil && r.RemoteLinkAddress == "" + if r.nic.neigh != nil { + return r.nic.isValidForOutgoing(r.addressEndpoint) && r.linkRes != nil && r.RemoteLinkAddress == "" } - return r.ref.isValidForOutgoing() && r.ref.linkCache != nil && r.RemoteLinkAddress == "" + return r.nic.isValidForOutgoing(r.addressEndpoint) && r.linkCache != nil && r.RemoteLinkAddress == "" } // WritePacket writes the packet through the given route. func (r *Route) WritePacket(gso *GSO, params NetworkHeaderParams, pkt *PacketBuffer) *tcpip.Error { - if !r.ref.isValidForOutgoing() { + if !r.nic.isValidForOutgoing(r.addressEndpoint) { return tcpip.ErrInvalidEndpointState } // WritePacket takes ownership of pkt, calculate numBytes first. numBytes := pkt.Size() - err := r.ref.ep.WritePacket(r, gso, params, pkt) + err := r.addressEndpoint.NetworkEndpoint().WritePacket(r, gso, params, pkt) if err != nil { r.Stats().IP.OutgoingPacketErrors.Increment() } else { - r.ref.nic.stats.Tx.Packets.Increment() - r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes)) + r.nic.stats.Tx.Packets.Increment() + r.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes)) } return err } @@ -203,76 +223,75 @@ func (r *Route) WritePacket(gso *GSO, params NetworkHeaderParams, pkt *PacketBuf // WritePackets writes a list of n packets through the given route and returns // the number of packets written. func (r *Route) WritePackets(gso *GSO, pkts PacketBufferList, params NetworkHeaderParams) (int, *tcpip.Error) { - if !r.ref.isValidForOutgoing() { + if !r.nic.isValidForOutgoing(r.addressEndpoint) { return 0, tcpip.ErrInvalidEndpointState } // WritePackets takes ownership of pkt, calculate length first. numPkts := pkts.Len() - n, err := r.ref.ep.WritePackets(r, gso, pkts, params) + n, err := r.addressEndpoint.NetworkEndpoint().WritePackets(r, gso, pkts, params) if err != nil { r.Stats().IP.OutgoingPacketErrors.IncrementBy(uint64(numPkts - n)) } - r.ref.nic.stats.Tx.Packets.IncrementBy(uint64(n)) + r.nic.stats.Tx.Packets.IncrementBy(uint64(n)) writtenBytes := 0 for i, pb := 0, pkts.Front(); i < n && pb != nil; i, pb = i+1, pb.Next() { writtenBytes += pb.Size() } - r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(writtenBytes)) + r.nic.stats.Tx.Bytes.IncrementBy(uint64(writtenBytes)) return n, err } // WriteHeaderIncludedPacket writes a packet already containing a network // header through the given route. func (r *Route) WriteHeaderIncludedPacket(pkt *PacketBuffer) *tcpip.Error { - if !r.ref.isValidForOutgoing() { + if !r.nic.isValidForOutgoing(r.addressEndpoint) { return tcpip.ErrInvalidEndpointState } // WriteHeaderIncludedPacket takes ownership of pkt, calculate numBytes first. numBytes := pkt.Data.Size() - if err := r.ref.ep.WriteHeaderIncludedPacket(r, pkt); err != nil { + if err := r.addressEndpoint.NetworkEndpoint().WriteHeaderIncludedPacket(r, pkt); err != nil { r.Stats().IP.OutgoingPacketErrors.Increment() return err } - r.ref.nic.stats.Tx.Packets.Increment() - r.ref.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes)) + r.nic.stats.Tx.Packets.Increment() + r.nic.stats.Tx.Bytes.IncrementBy(uint64(numBytes)) return nil } // DefaultTTL returns the default TTL of the underlying network endpoint. func (r *Route) DefaultTTL() uint8 { - return r.ref.ep.DefaultTTL() + return r.addressEndpoint.NetworkEndpoint().DefaultTTL() } // MTU returns the MTU of the underlying network endpoint. func (r *Route) MTU() uint32 { - return r.ref.ep.MTU() + return r.addressEndpoint.NetworkEndpoint().MTU() } // NetworkProtocolNumber returns the NetworkProtocolNumber of the underlying // network endpoint. func (r *Route) NetworkProtocolNumber() tcpip.NetworkProtocolNumber { - return r.ref.ep.NetworkProtocolNumber() + return r.addressEndpoint.NetworkEndpoint().NetworkProtocolNumber() } // Release frees all resources associated with the route. func (r *Route) Release() { - if r.ref != nil { - r.ref.decRef() - r.ref = nil + if r.addressEndpoint != nil { + r.addressEndpoint.DecRef() + r.addressEndpoint = nil } } -// Clone Clone a route such that the original one can be released and the new -// one will remain valid. +// Clone clones the route. func (r *Route) Clone() Route { - if r.ref != nil { - r.ref.incRef() + if r.addressEndpoint != nil { + _ = r.addressEndpoint.IncRef() } return *r } @@ -296,7 +315,7 @@ func (r *Route) MakeLoopedRoute() Route { // Stack returns the instance of the Stack that owns this route. func (r *Route) Stack() *Stack { - return r.ref.stack() + return r.nic.stack } func (r *Route) isV4Broadcast(addr tcpip.Address) bool { @@ -304,7 +323,7 @@ func (r *Route) isV4Broadcast(addr tcpip.Address) bool { return true } - subnet := r.ref.addrWithPrefix().Subnet() + subnet := r.addressEndpoint.AddressWithPrefix().Subnet() return subnet.IsBroadcast(addr) } @@ -330,7 +349,10 @@ func (r *Route) ReverseRoute(src tcpip.Address, dst tcpip.Address) Route { LocalLinkAddress: r.RemoteLinkAddress, RemoteAddress: src, RemoteLinkAddress: r.LocalLinkAddress, - ref: r.ref, Loop: r.Loop, + addressEndpoint: r.addressEndpoint, + nic: r.nic, + linkCache: r.linkCache, + linkRes: r.linkRes, } } diff --git a/pkg/tcpip/stack/stack.go b/pkg/tcpip/stack/stack.go index c22633f6b..b740aa305 100644 --- a/pkg/tcpip/stack/stack.go +++ b/pkg/tcpip/stack/stack.go @@ -363,38 +363,6 @@ func (u *uniqueIDGenerator) UniqueID() uint64 { return atomic.AddUint64((*uint64)(u), 1) } -// NICNameFromID is a function that returns a stable name for the specified NIC, -// even if different NIC IDs are used to refer to the same NIC in different -// program runs. It is used when generating opaque interface identifiers (IIDs). -// If the NIC was created with a name, it will be passed to NICNameFromID. -// -// NICNameFromID SHOULD return unique NIC names so unique opaque IIDs are -// generated for the same prefix on differnt NICs. -type NICNameFromID func(tcpip.NICID, string) string - -// OpaqueInterfaceIdentifierOptions holds the options related to the generation -// of opaque interface indentifiers (IIDs) as defined by RFC 7217. -type OpaqueInterfaceIdentifierOptions struct { - // NICNameFromID is a function that returns a stable name for a specified NIC, - // even if the NIC ID changes over time. - // - // Must be specified to generate the opaque IID. - NICNameFromID NICNameFromID - - // SecretKey is a pseudo-random number used as the secret key when generating - // opaque IIDs as defined by RFC 7217. The key SHOULD be at least - // header.OpaqueIIDSecretKeyMinBytes bytes and MUST follow minimum randomness - // requirements for security as outlined by RFC 4086. SecretKey MUST NOT - // change between program runs, unless explicitly changed. - // - // OpaqueInterfaceIdentifierOptions takes ownership of SecretKey. SecretKey - // MUST NOT be modified after Stack is created. - // - // May be nil, but a nil value is highly discouraged to maintain - // some level of randomness between nodes. - SecretKey []byte -} - // Stack is a networking stack, with all supported protocols, NICs, and route // table. type Stack struct { @@ -402,13 +370,6 @@ type Stack struct { networkProtocols map[tcpip.NetworkProtocolNumber]NetworkProtocol linkAddrResolvers map[tcpip.NetworkProtocolNumber]LinkAddressResolver - // forwarding contains the whether packet forwarding is enabled or not for - // different network protocols. - forwarding struct { - sync.RWMutex - protocols map[tcpip.NetworkProtocolNumber]bool - } - // rawFactory creates raw endpoints. If nil, raw endpoints are // disabled. It is set during Stack creation and is immutable. rawFactory RawFactory @@ -461,9 +422,6 @@ type Stack struct { // TODO(gvisor.dev/issue/940): S/R this field. seed uint32 - // ndpConfigs is the default NDP configurations used by interfaces. - ndpConfigs NDPConfigurations - // nudConfigs is the default NUD configurations used by interfaces. nudConfigs NUDConfigurations @@ -471,15 +429,6 @@ type Stack struct { // by the NIC's neighborCache instead of linkAddrCache. useNeighborCache bool - // autoGenIPv6LinkLocal determines whether or not the stack will attempt - // 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 - - // ndpDisp is the NDP event dispatcher that is used to send the netstack - // integrator NDP related events. - ndpDisp NDPDispatcher - // nudDisp is the NUD event dispatcher that is used to send the netstack // integrator NUD related events. nudDisp NUDDispatcher @@ -487,14 +436,6 @@ type Stack struct { // uniqueIDGenerator is a generator of unique identifiers. uniqueIDGenerator UniqueID - // 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 - // forwarder holds the packets that wait for their link-address resolutions // to complete, and forwards them when each resolution is done. forwarder *forwardQueue @@ -553,13 +494,6 @@ type Options struct { // UniqueID is an optional generator of unique identifiers. UniqueID UniqueID - // NDPConfigs is the default NDP configurations used by interfaces. - // - // By default, NDPConfigs will have a zero value for its - // DupAddrDetectTransmits field, implying that DAD will not be performed - // before assigning an address to a NIC. - NDPConfigs NDPConfigurations - // NUDConfigs is the default NUD configurations used by interfaces. NUDConfigs NUDConfigurations @@ -570,24 +504,6 @@ type Options struct { // and ClearNeighbors. UseNeighborCache bool - // AutoGenIPv6LinkLocal determines whether or not the stack will attempt to - // auto-generate an IPv6 link-local address for newly enabled non-loopback - // NICs. - // - // Note, setting this to true does not mean that a link-local address - // will be assigned right away, or at all. If Duplicate Address Detection - // is enabled, an address will only be assigned if it successfully resolves. - // If it fails, no further attempt will be made to auto-generate an IPv6 - // link-local address. - // - // The generated link-local address will follow RFC 4291 Appendix A - // guidelines. - AutoGenIPv6LinkLocal bool - - // NDPDisp is the NDP event dispatcher that an integrator can provide to - // receive NDP related events. - NDPDisp NDPDispatcher - // NUDDisp is the NUD event dispatcher that an integrator can provide to // receive NUD related events. NUDDisp NUDDispatcher @@ -596,31 +512,12 @@ type Options struct { // this is non-nil. RawFactory RawFactory - // OpaqueIIDOpts hold the options for generating opaque interface - // identifiers (IIDs) as outlined by RFC 7217. - OpaqueIIDOpts OpaqueInterfaceIdentifierOptions - // RandSource is an optional source to use to generate random // numbers. If omitted it defaults to a Source seeded by the data // returned by rand.Read(). // // RandSource must be thread-safe. RandSource mathrand.Source - - // TempIIDSeed is used to seed the initial temporary interface identifier - // history value used to generate IIDs for temporary SLAAC addresses. - // - // Temporary SLAAC adresses are short-lived addresses which are unpredictable - // and random from the perspective of other nodes on the network. It is - // recommended that the seed be a random byte buffer of at least - // header.IIDSize bytes to make sure that temporary SLAAC addresses are - // sufficiently random. It should follow minimum randomness requirements for - // security as outlined by RFC 4086. - // - // Note: using a nil value, the same seed across netstack program runs, or a - // seed that is too small would reduce randomness and increase predictability, - // defeating the purpose of temporary SLAAC addresses. - TempIIDSeed []byte } // TransportEndpointInfo holds useful information about a transport endpoint @@ -723,36 +620,28 @@ func New(opts Options) *Stack { randSrc = &lockedRandomSource{src: mathrand.NewSource(generateRandInt64())} } - // Make sure opts.NDPConfigs contains valid values only. - opts.NDPConfigs.validate() - opts.NUDConfigs.resetInvalidFields() s := &Stack{ - transportProtocols: make(map[tcpip.TransportProtocolNumber]*transportProtocolState), - networkProtocols: make(map[tcpip.NetworkProtocolNumber]NetworkProtocol), - linkAddrResolvers: make(map[tcpip.NetworkProtocolNumber]LinkAddressResolver), - nics: make(map[tcpip.NICID]*NIC), - cleanupEndpoints: make(map[TransportEndpoint]struct{}), - linkAddrCache: newLinkAddrCache(ageLimit, resolutionTimeout, resolutionAttempts), - PortManager: ports.NewPortManager(), - clock: clock, - stats: opts.Stats.FillIn(), - handleLocal: opts.HandleLocal, - tables: DefaultTables(), - icmpRateLimiter: NewICMPRateLimiter(), - seed: generateRandUint32(), - ndpConfigs: opts.NDPConfigs, - nudConfigs: opts.NUDConfigs, - useNeighborCache: opts.UseNeighborCache, - autoGenIPv6LinkLocal: opts.AutoGenIPv6LinkLocal, - uniqueIDGenerator: opts.UniqueID, - ndpDisp: opts.NDPDisp, - nudDisp: opts.NUDDisp, - opaqueIIDOpts: opts.OpaqueIIDOpts, - tempIIDSeed: opts.TempIIDSeed, - forwarder: newForwardQueue(), - randomGenerator: mathrand.New(randSrc), + transportProtocols: make(map[tcpip.TransportProtocolNumber]*transportProtocolState), + networkProtocols: make(map[tcpip.NetworkProtocolNumber]NetworkProtocol), + linkAddrResolvers: make(map[tcpip.NetworkProtocolNumber]LinkAddressResolver), + nics: make(map[tcpip.NICID]*NIC), + cleanupEndpoints: make(map[TransportEndpoint]struct{}), + linkAddrCache: newLinkAddrCache(ageLimit, resolutionTimeout, resolutionAttempts), + PortManager: ports.NewPortManager(), + clock: clock, + stats: opts.Stats.FillIn(), + handleLocal: opts.HandleLocal, + tables: DefaultTables(), + icmpRateLimiter: NewICMPRateLimiter(), + seed: generateRandUint32(), + nudConfigs: opts.NUDConfigs, + useNeighborCache: opts.UseNeighborCache, + uniqueIDGenerator: opts.UniqueID, + nudDisp: opts.NUDDisp, + forwarder: newForwardQueue(), + randomGenerator: mathrand.New(randSrc), sendBufferSize: SendBufferSizeOption{ Min: MinBufferSize, Default: DefaultBufferSize, @@ -764,7 +653,6 @@ func New(opts Options) *Stack { Max: DefaultMaxBufferSize, }, } - s.forwarding.protocols = make(map[tcpip.NetworkProtocolNumber]bool) // Add specified network protocols. for _, netProtoFactory := range opts.NetworkProtocols { @@ -884,42 +772,37 @@ func (s *Stack) Stats() tcpip.Stats { return s.stats } -// SetForwarding enables or disables packet forwarding between NICs. -func (s *Stack) SetForwarding(protocol tcpip.NetworkProtocolNumber, enable bool) { - s.forwarding.Lock() - defer s.forwarding.Unlock() - - // If this stack does not support the protocol, do nothing. - if _, ok := s.networkProtocols[protocol]; !ok { - return +// SetForwarding enables or disables packet forwarding between NICs for the +// passed protocol. +func (s *Stack) SetForwarding(protocolNum tcpip.NetworkProtocolNumber, enable bool) *tcpip.Error { + protocol, ok := s.networkProtocols[protocolNum] + if !ok { + return tcpip.ErrUnknownProtocol } - // If the forwarding value for this protocol hasn't changed then do - // nothing. - if forwarding := s.forwarding.protocols[protocol]; forwarding == enable { - return + forwardingProtocol, ok := protocol.(ForwardingNetworkProtocol) + if !ok { + return tcpip.ErrNotSupported } - s.forwarding.protocols[protocol] = enable + forwardingProtocol.SetForwarding(enable) + return nil +} - if protocol == header.IPv6ProtocolNumber { - if enable { - for _, nic := range s.nics { - nic.becomeIPv6Router() - } - } else { - for _, nic := range s.nics { - nic.becomeIPv6Host() - } - } +// Forwarding returns true if packet forwarding between NICs is enabled for the +// passed protocol. +func (s *Stack) Forwarding(protocolNum tcpip.NetworkProtocolNumber) bool { + protocol, ok := s.networkProtocols[protocolNum] + if !ok { + return false } -} -// Forwarding returns if packet forwarding between NICs is enabled. -func (s *Stack) Forwarding(protocol tcpip.NetworkProtocolNumber) bool { - s.forwarding.RLock() - defer s.forwarding.RUnlock() - return s.forwarding.protocols[protocol] + forwardingProtocol, ok := protocol.(ForwardingNetworkProtocol) + if !ok { + return false + } + + return forwardingProtocol.Forwarding() } // SetRouteTable assigns the route table to be used by this stack. It @@ -1081,7 +964,8 @@ func (s *Stack) DisableNIC(id tcpip.NICID) *tcpip.Error { return tcpip.ErrUnknownNICID } - return nic.disable() + nic.disable() + return nil } // CheckNIC checks if a NIC is usable. @@ -1094,7 +978,7 @@ func (s *Stack) CheckNIC(id tcpip.NICID) bool { return false } - return nic.enabled() + return nic.Enabled() } // RemoveNIC removes NIC and all related routes from the network stack. @@ -1172,14 +1056,14 @@ func (s *Stack) NICInfo() map[tcpip.NICID]NICInfo { for id, nic := range s.nics { flags := NICStateFlags{ Up: true, // Netstack interfaces are always up. - Running: nic.enabled(), + Running: nic.Enabled(), Promiscuous: nic.isPromiscuousMode(), - Loopback: nic.isLoopback(), + Loopback: nic.IsLoopback(), } nics[id] = NICInfo{ Name: nic.name, LinkAddress: nic.linkEP.LinkAddress(), - ProtocolAddresses: nic.PrimaryAddresses(), + ProtocolAddresses: nic.primaryAddresses(), Flags: flags, MTU: nic.linkEP.MTU(), Stats: nic.stats, @@ -1243,7 +1127,7 @@ func (s *Stack) AddProtocolAddressWithOptions(id tcpip.NICID, protocolAddress tc return tcpip.ErrUnknownNICID } - return nic.AddAddress(protocolAddress, peb) + return nic.addAddress(protocolAddress, peb) } // RemoveAddress removes an existing network-layer address from the specified @@ -1253,7 +1137,7 @@ func (s *Stack) RemoveAddress(id tcpip.NICID, addr tcpip.Address) *tcpip.Error { defer s.mu.RUnlock() if nic, ok := s.nics[id]; ok { - return nic.RemoveAddress(addr) + return nic.removeAddress(addr) } return tcpip.ErrUnknownNICID @@ -1267,7 +1151,7 @@ func (s *Stack) AllAddresses() map[tcpip.NICID][]tcpip.ProtocolAddress { nics := make(map[tcpip.NICID][]tcpip.ProtocolAddress) for id, nic := range s.nics { - nics[id] = nic.AllAddresses() + nics[id] = nic.allPermanentAddresses() } return nics } @@ -1289,7 +1173,7 @@ func (s *Stack) GetMainNICAddress(id tcpip.NICID, protocol tcpip.NetworkProtocol return nic.primaryAddress(protocol), nil } -func (s *Stack) getRefEP(nic *NIC, localAddr, remoteAddr tcpip.Address, netProto tcpip.NetworkProtocolNumber) (ref *referencedNetworkEndpoint) { +func (s *Stack) getAddressEP(nic *NIC, localAddr, remoteAddr tcpip.Address, netProto tcpip.NetworkProtocolNumber) AssignableAddressEndpoint { if len(localAddr) == 0 { return nic.primaryEndpoint(netProto, remoteAddr) } @@ -1306,9 +1190,9 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n isMulticast := header.IsV4MulticastAddress(remoteAddr) || header.IsV6MulticastAddress(remoteAddr) needRoute := !(isLocalBroadcast || isMulticast || header.IsV6LinkLocalAddress(remoteAddr)) if id != 0 && !needRoute { - if nic, ok := s.nics[id]; ok && nic.enabled() { - if ref := s.getRefEP(nic, localAddr, remoteAddr, netProto); ref != nil { - return makeRoute(netProto, ref.address(), remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.isLoopback(), multicastLoop && !nic.isLoopback()), nil + if nic, ok := s.nics[id]; ok && nic.Enabled() { + if addressEndpoint := s.getAddressEP(nic, localAddr, remoteAddr, netProto); addressEndpoint != nil { + return makeRoute(netProto, addressEndpoint.AddressWithPrefix().Address, remoteAddr, nic, addressEndpoint, s.handleLocal && !nic.IsLoopback(), multicastLoop && !nic.IsLoopback()), nil } } } else { @@ -1316,20 +1200,20 @@ func (s *Stack) FindRoute(id tcpip.NICID, localAddr, remoteAddr tcpip.Address, n if (id != 0 && id != route.NIC) || (len(remoteAddr) != 0 && !route.Destination.Contains(remoteAddr)) { continue } - if nic, ok := s.nics[route.NIC]; ok && nic.enabled() { - if ref := s.getRefEP(nic, localAddr, remoteAddr, netProto); ref != nil { + if nic, ok := s.nics[route.NIC]; ok && nic.Enabled() { + if addressEndpoint := s.getAddressEP(nic, localAddr, remoteAddr, netProto); addressEndpoint != nil { if len(remoteAddr) == 0 { // If no remote address was provided, then the route // provided will refer to the link local address. - remoteAddr = ref.address() + remoteAddr = addressEndpoint.AddressWithPrefix().Address } - r := makeRoute(netProto, ref.address(), remoteAddr, nic.linkEP.LinkAddress(), ref, s.handleLocal && !nic.isLoopback(), multicastLoop && !nic.isLoopback()) + r := makeRoute(netProto, addressEndpoint.AddressWithPrefix().Address, remoteAddr, nic, addressEndpoint, s.handleLocal && !nic.IsLoopback(), multicastLoop && !nic.IsLoopback()) if len(route.Gateway) > 0 { if needRoute { r.NextHop = route.Gateway } - } else if subnet := ref.addrWithPrefix().Subnet(); subnet.IsBroadcast(remoteAddr) { + } else if subnet := addressEndpoint.AddressWithPrefix().Subnet(); subnet.IsBroadcast(remoteAddr) { r.RemoteLinkAddress = header.EthernetBroadcastAddress } @@ -1367,21 +1251,20 @@ func (s *Stack) CheckLocalAddress(nicID tcpip.NICID, protocol tcpip.NetworkProto return 0 } - ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) - if ref == nil { + addressEndpoint := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) + if addressEndpoint == nil { return 0 } - ref.decRef() + addressEndpoint.DecRef() return nic.id } // Go through all the NICs. for _, nic := range s.nics { - ref := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint) - if ref != nil { - ref.decRef() + if addressEndpoint := nic.findEndpoint(protocol, addr, CanBePrimaryEndpoint); addressEndpoint != nil { + addressEndpoint.DecRef() return nic.id } } @@ -1850,7 +1733,7 @@ func (s *Stack) LeaveGroup(protocol tcpip.NetworkProtocolNumber, nicID tcpip.NIC defer s.mu.RUnlock() if nic, ok := s.nics[nicID]; ok { - return nic.leaveGroup(multicastAddr) + return nic.leaveGroup(protocol, multicastAddr) } return tcpip.ErrUnknownNICID } @@ -1902,53 +1785,18 @@ func (s *Stack) AllowICMPMessage() bool { return s.icmpRateLimiter.Allow() } -// IsAddrTentative returns true if addr is tentative on the NIC with ID id. -// -// Note that if addr is not associated with a NIC with id ID, then this -// function will return false. It will only return true if the address is -// associated with the NIC AND it is tentative. -func (s *Stack) IsAddrTentative(id tcpip.NICID, addr tcpip.Address) (bool, *tcpip.Error) { - s.mu.RLock() - defer s.mu.RUnlock() - - nic, ok := s.nics[id] - if !ok { - return false, tcpip.ErrUnknownNICID - } - - return nic.isAddrTentative(addr), nil -} - -// DupTentativeAddrDetected attempts to inform the NIC with ID id that a -// tentative addr on it is a duplicate on a link. -func (s *Stack) DupTentativeAddrDetected(id tcpip.NICID, addr tcpip.Address) *tcpip.Error { - s.mu.Lock() - defer s.mu.Unlock() - - nic, ok := s.nics[id] - if !ok { - return tcpip.ErrUnknownNICID - } - - return nic.dupTentativeAddrDetected(addr) -} - -// SetNDPConfigurations sets the per-interface NDP configurations on the NIC -// with ID id to c. -// -// Note, if c contains invalid NDP configuration values, it will be fixed to -// use default values for the erroneous values. -func (s *Stack) SetNDPConfigurations(id tcpip.NICID, c NDPConfigurations) *tcpip.Error { +// GetNetworkEndpoint returns the NetworkEndpoint with the specified protocol +// number installed on the specified NIC. +func (s *Stack) GetNetworkEndpoint(nicID tcpip.NICID, proto tcpip.NetworkProtocolNumber) (NetworkEndpoint, *tcpip.Error) { s.mu.Lock() defer s.mu.Unlock() - nic, ok := s.nics[id] + nic, ok := s.nics[nicID] if !ok { - return tcpip.ErrUnknownNICID + return nil, tcpip.ErrUnknownNICID } - nic.setNDPConfigs(c) - return nil + return nic.networkEndpoints[proto], nil } // NUDConfigurations gets the per-interface NUD configurations. @@ -1961,7 +1809,7 @@ func (s *Stack) NUDConfigurations(id tcpip.NICID) (NUDConfigurations, *tcpip.Err return NUDConfigurations{}, tcpip.ErrUnknownNICID } - return nic.NUDConfigs() + return nic.nudConfigs() } // SetNUDConfigurations sets the per-interface NUD configurations. @@ -1980,22 +1828,6 @@ func (s *Stack) SetNUDConfigurations(id tcpip.NICID, c NUDConfigurations) *tcpip return nic.setNUDConfigs(c) } -// HandleNDPRA provides a NIC with ID id a validated NDP Router Advertisement -// message that it needs to handle. -func (s *Stack) HandleNDPRA(id tcpip.NICID, ip tcpip.Address, ra header.NDPRouterAdvert) *tcpip.Error { - s.mu.Lock() - defer s.mu.Unlock() - - nic, ok := s.nics[id] - if !ok { - return tcpip.ErrUnknownNICID - } - - nic.handleNDPRA(ip, ra) - - return nil -} - // Seed returns a 32 bit value that can be used as a seed value for port // picking, ISN generation etc. // @@ -2037,16 +1869,14 @@ func (s *Stack) FindNetworkEndpoint(netProto tcpip.NetworkProtocolNumber, addres defer s.mu.RUnlock() for _, nic := range s.nics { - id := NetworkEndpointID{address} - - if ref, ok := nic.mu.endpoints[id]; ok { - nic.mu.RLock() - defer nic.mu.RUnlock() - - // An endpoint with this id exists, check if it can be - // used and return it. - return ref.ep, nil + addressEndpoint := nic.getAddressOrCreateTempInner(netProto, address, false /* createTemp */, NeverPrimaryEndpoint) + if addressEndpoint == nil { + continue } + + ep := addressEndpoint.NetworkEndpoint() + addressEndpoint.DecRef() + return ep, nil } return nil, tcpip.ErrBadAddress } @@ -2063,3 +1893,8 @@ func (s *Stack) FindNICNameFromID(id tcpip.NICID) string { return nic.Name() } + +// NewJob returns a new tcpip.Job using the stack's clock. +func (s *Stack) NewJob(l sync.Locker, f func()) *tcpip.Job { + return tcpip.NewJob(s.clock, l, f) +} diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go index c205650fe..7589306a4 100644 --- a/pkg/tcpip/stack/stack_test.go +++ b/pkg/tcpip/stack/stack_test.go @@ -29,6 +29,7 @@ import ( "github.com/google/go-cmp/cmp" "github.com/google/go-cmp/cmp/cmpopts" "gvisor.dev/gvisor/pkg/rand" + "gvisor.dev/gvisor/pkg/sync" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/buffer" "gvisor.dev/gvisor/pkg/tcpip/header" @@ -68,12 +69,24 @@ const ( // use the first three: destination address, source address, and transport // protocol. They're all one byte fields to simplify parsing. type fakeNetworkEndpoint struct { + stack.AddressableEndpointState + nicID tcpip.NICID proto *fakeNetworkProtocol dispatcher stack.TransportDispatcher ep stack.LinkEndpoint } +func (*fakeNetworkEndpoint) Enable() *tcpip.Error { + return nil +} + +func (*fakeNetworkEndpoint) Enabled() bool { + return true +} + +func (*fakeNetworkEndpoint) Disable() {} + func (f *fakeNetworkEndpoint) MTU() uint32 { return f.ep.MTU() - uint32(f.MaxHeaderLength()) } @@ -156,7 +169,9 @@ func (*fakeNetworkEndpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt *stack return tcpip.ErrNotSupported } -func (*fakeNetworkEndpoint) Close() {} +func (f *fakeNetworkEndpoint) Close() { + f.AddressableEndpointState.Cleanup() +} // fakeNetworkProtocol is a network-layer protocol descriptor. It aggregates the // number of packets sent and received via endpoints of this protocol. The index @@ -165,6 +180,11 @@ type fakeNetworkProtocol struct { packetCount [10]int sendPacketCount [10]int defaultTTL uint8 + + mu struct { + sync.RWMutex + forwarding bool + } } func (f *fakeNetworkProtocol) Number() tcpip.NetworkProtocolNumber { @@ -187,13 +207,15 @@ func (*fakeNetworkProtocol) ParseAddresses(v buffer.View) (src, dst tcpip.Addres return tcpip.Address(v[srcAddrOffset : srcAddrOffset+1]), tcpip.Address(v[dstAddrOffset : dstAddrOffset+1]) } -func (f *fakeNetworkProtocol) NewEndpoint(nicID tcpip.NICID, _ stack.LinkAddressCache, _ stack.NUDHandler, dispatcher stack.TransportDispatcher, ep stack.LinkEndpoint, _ *stack.Stack) stack.NetworkEndpoint { - return &fakeNetworkEndpoint{ - nicID: nicID, +func (f *fakeNetworkProtocol) NewEndpoint(nic stack.NetworkInterface, _ stack.LinkAddressCache, _ stack.NUDHandler, dispatcher stack.TransportDispatcher, ep stack.LinkEndpoint, _ *stack.Stack) stack.NetworkEndpoint { + e := &fakeNetworkEndpoint{ + nicID: nic.ID(), proto: f, dispatcher: dispatcher, ep: ep, } + e.AddressableEndpointState.Init(e) + return e } func (f *fakeNetworkProtocol) SetOption(option tcpip.SettableNetworkProtocolOption) *tcpip.Error { @@ -231,6 +253,20 @@ func (*fakeNetworkProtocol) Parse(pkt *stack.PacketBuffer) (tcpip.TransportProto return tcpip.TransportProtocolNumber(hdr[protocolNumberOffset]), true, true } +// Forwarding implements stack.ForwardingNetworkProtocol. +func (f *fakeNetworkProtocol) Forwarding() bool { + f.mu.RLock() + defer f.mu.RUnlock() + return f.mu.forwarding +} + +// SetForwarding implements stack.ForwardingNetworkProtocol. +func (f *fakeNetworkProtocol) SetForwarding(v bool) { + f.mu.Lock() + defer f.mu.Unlock() + f.mu.forwarding = v +} + func fakeNetFactory(*stack.Stack) stack.NetworkProtocol { return &fakeNetworkProtocol{} } @@ -2213,7 +2249,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName string autoGen bool linkAddr tcpip.LinkAddress - iidOpts stack.OpaqueInterfaceIdentifierOptions + iidOpts ipv6.OpaqueInterfaceIdentifierOptions shouldGen bool expectedAddr tcpip.Address }{ @@ -2229,7 +2265,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName: "nic1", autoGen: false, linkAddr: linkAddr1, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, SecretKey: secretKey[:], }, @@ -2274,7 +2310,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName: "nic1", autoGen: true, linkAddr: linkAddr1, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, SecretKey: secretKey[:], }, @@ -2286,7 +2322,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { { name: "OIID Empty MAC and empty nicName", autoGen: true, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, SecretKey: secretKey[:1], }, @@ -2298,7 +2334,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName: "test", autoGen: true, linkAddr: "\x01\x02\x03", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, SecretKey: secretKey[:2], }, @@ -2310,7 +2346,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName: "test2", autoGen: true, linkAddr: "\x01\x02\x03\x04\x05\x06", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, SecretKey: secretKey[:3], }, @@ -2322,7 +2358,7 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { nicName: "test3", autoGen: true, linkAddr: "\x00\x00\x00\x00\x00\x00", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ + iidOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: nicNameFunc, }, shouldGen: true, @@ -2336,10 +2372,11 @@ func TestNICAutoGenLinkLocalAddr(t *testing.T) { autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), } opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - AutoGenIPv6LinkLocal: test.autoGen, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: test.iidOpts, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + AutoGenIPv6LinkLocal: test.autoGen, + NDPDisp: &ndpDisp, + OpaqueIIDOpts: test.iidOpts, + })}, } e := channel.New(0, 1280, test.linkAddr) @@ -2411,15 +2448,15 @@ func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) { tests := []struct { name string - opaqueIIDOpts stack.OpaqueInterfaceIdentifierOptions + opaqueIIDOpts ipv6.OpaqueInterfaceIdentifierOptions }{ { name: "IID From MAC", - opaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{}, + opaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{}, }, { name: "Opaque IID", - opaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ + opaqueIIDOpts: ipv6.OpaqueInterfaceIdentifierOptions{ NICNameFromID: func(_ tcpip.NICID, nicName string) string { return nicName }, @@ -2430,9 +2467,10 @@ func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) { for _, test := range tests { t.Run(test.name, func(t *testing.T) { opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - AutoGenIPv6LinkLocal: true, - OpaqueIIDOpts: test.opaqueIIDOpts, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + AutoGenIPv6LinkLocal: true, + OpaqueIIDOpts: test.opaqueIIDOpts, + })}, } e := loopback.New() @@ -2461,12 +2499,13 @@ func TestNICAutoGenAddrDoesDAD(t *testing.T) { ndpDisp := ndpDispatcher{ dadC: make(chan ndpDADEvent), } - ndpConfigs := stack.DefaultNDPConfigurations() + ndpConfigs := ipv6.DefaultNDPConfigurations() opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: ndpConfigs, - AutoGenIPv6LinkLocal: true, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ndpConfigs, + AutoGenIPv6LinkLocal: true, + NDPDisp: &ndpDisp, + })}, } e := channel.New(int(ndpConfigs.DupAddrDetectTransmits), 1280, linkAddr1) @@ -2813,14 +2852,15 @@ func TestIPv6SourceAddressSelectionScopeAndSameAddress(t *testing.T) { t.Run(test.name, func(t *testing.T) { e := channel.New(0, 1280, linkAddr1) s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + HandleRAs: true, + AutoGenGlobalAddresses: true, + AutoGenTempGlobalAddresses: true, + }, + NDPDisp: &ndpDispatcher{}, + })}, TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDispatcher{}, }) if err := s.CreateNIC(nicID, e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) @@ -3059,12 +3099,13 @@ func TestDoDADWhenNICEnabled(t *testing.T) { dadC: make(chan ndpDADEvent), } opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - }, - NDPDisp: &ndpDisp, + NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocolWithOptions(ipv6.Options{ + NDPConfigs: ipv6.NDPConfigurations{ + DupAddrDetectTransmits: dadTransmits, + RetransmitTimer: retransmitTimer, + }, + NDPDisp: &ndpDisp, + })}, } e := channel.New(dadTransmits, 1280, linkAddr1) @@ -3499,3 +3540,91 @@ func TestResolveWith(t *testing.T) { t.Fatal("got r.IsResolutionRequired() = true, want = false") } } + +// TestRouteReleaseAfterAddrRemoval tests that releasing a Route after its +// associated address is removed should not cause a panic. +func TestRouteReleaseAfterAddrRemoval(t *testing.T) { + const ( + nicID = 1 + localAddr = tcpip.Address("\x01") + remoteAddr = tcpip.Address("\x02") + ) + + s := stack.New(stack.Options{ + NetworkProtocols: []stack.NetworkProtocolFactory{fakeNetFactory}, + }) + + ep := channel.New(0, defaultMTU, "") + if err := s.CreateNIC(nicID, ep); err != nil { + t.Fatalf("CreateNIC(%d, _): %s", nicID, err) + } + if err := s.AddAddress(nicID, fakeNetNumber, localAddr); err != nil { + t.Fatalf("s.AddAddress(%d, %d, %s): %s", nicID, fakeNetNumber, localAddr, err) + } + { + subnet, err := tcpip.NewSubnet("\x00", "\x00") + if err != nil { + t.Fatal(err) + } + s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) + } + + r, err := s.FindRoute(nicID, localAddr, remoteAddr, fakeNetNumber, false /* multicastLoop */) + if err != nil { + t.Fatalf("s.FindRoute(%d, %s, %s, %d, false): %s", nicID, localAddr, remoteAddr, fakeNetNumber, err) + } + // Should not panic. + defer r.Release() + + // Check that removing the same address fails. + if err := s.RemoveAddress(nicID, localAddr); err != nil { + t.Fatalf("s.RemoveAddress(%d, %s): %s", nicID, localAddr, err) + } +} + +func TestGetNetworkEndpoint(t *testing.T) { + const nicID = 1 + + tests := []struct { + name string + protoFactory stack.NetworkProtocolFactory + protoNum tcpip.NetworkProtocolNumber + }{ + { + name: "IPv4", + protoFactory: ipv4.NewProtocol, + protoNum: ipv4.ProtocolNumber, + }, + { + name: "IPv6", + protoFactory: ipv6.NewProtocol, + protoNum: ipv6.ProtocolNumber, + }, + } + + factories := make([]stack.NetworkProtocolFactory, 0, len(tests)) + for _, test := range tests { + factories = append(factories, test.protoFactory) + } + + s := stack.New(stack.Options{ + NetworkProtocols: factories, + }) + + if err := s.CreateNIC(nicID, channel.New(0, defaultMTU, "")); err != nil { + t.Fatalf("CreateNIC(%d, _): %s", nicID, err) + } + + for _, test := range tests { + t.Run(test.name, func(t *testing.T) { + ep, err := s.GetNetworkEndpoint(nicID, test.protoNum) + if err != nil { + t.Fatalf("s.GetNetworkEndpoint(%d, %d): %s", nicID, test.protoNum, err) + } + + if got := ep.NetworkProtocolNumber(); got != test.protoNum { + t.Fatalf("got ep.NetworkProtocolNumber() = %d, want = %d", got, test.protoNum) + } + }) + } +} diff --git a/pkg/tcpip/stack/transport_demuxer.go b/pkg/tcpip/stack/transport_demuxer.go index 0774b5382..4ebc30ca8 100644 --- a/pkg/tcpip/stack/transport_demuxer.go +++ b/pkg/tcpip/stack/transport_demuxer.go @@ -155,7 +155,7 @@ func (epsByNIC *endpointsByNIC) transportEndpoints() []TransportEndpoint { func (epsByNIC *endpointsByNIC) handlePacket(r *Route, id TransportEndpointID, pkt *PacketBuffer) { epsByNIC.mu.RLock() - mpep, ok := epsByNIC.endpoints[r.ref.nic.ID()] + mpep, ok := epsByNIC.endpoints[r.nic.ID()] if !ok { if mpep, ok = epsByNIC.endpoints[0]; !ok { epsByNIC.mu.RUnlock() // Don't use defer for performance reasons. @@ -626,7 +626,7 @@ func (d *transportDemuxer) findTransportEndpoint(netProto tcpip.NetworkProtocolN epsByNIC.mu.RLock() eps.mu.RUnlock() - mpep, ok := epsByNIC.endpoints[r.ref.nic.ID()] + mpep, ok := epsByNIC.endpoints[r.nic.ID()] if !ok { if mpep, ok = epsByNIC.endpoints[0]; !ok { epsByNIC.mu.RUnlock() // Don't use defer for performance reasons. |