diff options
Diffstat (limited to 'pkg/tcpip/stack/ndp.go')
| -rw-r--r-- | pkg/tcpip/stack/ndp.go | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/pkg/tcpip/stack/ndp.go b/pkg/tcpip/stack/ndp.go index 75d3ecdac..060a2e7c6 100644 --- a/pkg/tcpip/stack/ndp.go +++ b/pkg/tcpip/stack/ndp.go @@ -181,6 +181,17 @@ type NDPDispatcher interface { // 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). + OnRecursiveDNSServerOption(nicID tcpip.NICID, addrs []tcpip.Address, lifetime time.Duration) } // NDPConfigurations is the NDP configurations for the netstack. @@ -617,11 +628,16 @@ func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) { // 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.Type() { - case header.NDPPrefixInformationType: - pi := opt.(header.NDPPrefixInformation) + switch opt := opt.(type) { + case header.NDPRecursiveDNSServer: + if ndp.nic.stack.ndpDisp == nil { + continue + } + + ndp.nic.stack.ndpDisp.OnRecursiveDNSServerOption(ndp.nic.ID(), opt.Addresses(), opt.Lifetime()) - prefix := pi.Subnet() + case header.NDPPrefixInformation: + prefix := opt.Subnet() // Is the prefix a link-local? if header.IsV6LinkLocalAddress(prefix.ID()) { @@ -637,12 +653,12 @@ func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) { continue } - if pi.OnLinkFlag() { - ndp.handleOnLinkPrefixInformation(pi) + if opt.OnLinkFlag() { + ndp.handleOnLinkPrefixInformation(opt) } - if pi.AutonomousAddressConfigurationFlag() { - ndp.handleAutonomousPrefixInformation(pi) + if opt.AutonomousAddressConfigurationFlag() { + ndp.handleAutonomousPrefixInformation(opt) } } |