diff options
Diffstat (limited to 'pkg/tcpip/stack/ndp.go')
| -rw-r--r-- | pkg/tcpip/stack/ndp.go | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/pkg/tcpip/stack/ndp.go b/pkg/tcpip/stack/ndp.go index 045409bda..19bd05aa3 100644 --- a/pkg/tcpip/stack/ndp.go +++ b/pkg/tcpip/stack/ndp.go @@ -1148,22 +1148,27 @@ func (ndp *ndpState) cleanupAutoGenAddrResourcesAndNotify(addr tcpip.Address) bo return true } -// cleanupHostOnlyState cleans up any state that is only useful for hosts. +// cleanupState cleans up ndp's state. // -// cleanupHostOnlyState MUST be called 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 as routers do not -// normally process Router Advertisements to discover default routers and -// on-link prefixes, and auto-generate addresses via SLAAC. +// 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) cleanupHostOnlyState() { +func (ndp *ndpState) cleanupState(hostOnly bool) { linkLocalSubnet := header.IPv6LinkLocalPrefix.Subnet() linkLocalAddrs := 0 for addr := range ndp.autoGenAddresses { // RFC 4862 section 5 states that routers are also expected to generate a - // link-local address so we do not invalidate them. - if linkLocalSubnet.Contains(addr) { + // link-local address so we do not invalidate them if we are cleaning up + // host-only state. + if hostOnly && linkLocalSubnet.Contains(addr) { linkLocalAddrs++ continue } |