diff options
| -rw-r--r-- | pkg/tcpip/network/ipv6/ndp.go | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/pkg/tcpip/network/ipv6/ndp.go b/pkg/tcpip/network/ipv6/ndp.go index 9cd283eba..8837d66d8 100644 --- a/pkg/tcpip/network/ipv6/ndp.go +++ b/pkg/tcpip/network/ipv6/ndp.go @@ -54,6 +54,11 @@ const ( // Advertisements, as a host. defaultDiscoverDefaultRouters = true + // defaultDiscoverMoreSpecificRoutes is the default configuration for + // whether or not to discover more-specific routes from incoming Router + // Advertisements, as a host. + defaultDiscoverMoreSpecificRoutes = 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. @@ -352,12 +357,18 @@ type NDPConfigurations struct { // DiscoverDefaultRouters determines whether or not default routers are // discovered from Router Advertisements, as per RFC 4861 section 6. This - // configuration is ignored if HandleRAs is false. + // configuration is ignored if RAs will not be processed (see HandleRAs). DiscoverDefaultRouters bool + // DiscoverMoreSpecificRoutes determines whether or not more specific routes + // are discovered from Router Advertisements, as per RFC 4191. This + // configuration is ignored if RAs will not be processed (see HandleRAs). + DiscoverMoreSpecificRoutes bool + // DiscoverOnLinkPrefixes determines whether or not on-link prefixes are // discovered from Router Advertisements' Prefix Information option, as per - // RFC 4861 section 6. This configuration is ignored if HandleRAs is false. + // RFC 4861 section 6. This configuration is ignored if RAs will not be + // processed (see HandleRAs). DiscoverOnLinkPrefixes bool // AutoGenGlobalAddresses determines whether or not an IPv6 endpoint performs @@ -408,6 +419,7 @@ func DefaultNDPConfigurations() NDPConfigurations { MaxRtrSolicitationDelay: defaultMaxRtrSolicitationDelay, HandleRAs: defaultHandleRAs, DiscoverDefaultRouters: defaultDiscoverDefaultRouters, + DiscoverMoreSpecificRoutes: defaultDiscoverMoreSpecificRoutes, DiscoverOnLinkPrefixes: defaultDiscoverOnLinkPrefixes, AutoGenGlobalAddresses: defaultAutoGenGlobalAddresses, AutoGenTempGlobalAddresses: defaultAutoGenTempGlobalAddresses, @@ -786,6 +798,32 @@ func (ndp *ndpState) handleRA(ip tcpip.Address, ra header.NDPRouterAdvert) { if opt.AutonomousAddressConfigurationFlag() { ndp.handleAutonomousPrefixInformation(opt) } + + case header.NDPRouteInformation: + if !ndp.configs.DiscoverMoreSpecificRoutes { + continue + } + + dest, err := opt.Prefix() + if err != nil { + panic(fmt.Sprintf("%T.Prefix(): %s", opt, err)) + } + + prf := opt.RoutePreference() + if prf == header.ReservedRoutePreference { + // As per RFC 4191 section 2.3, + // + // Prf (Route Preference) + // 2-bit signed integer. The Route Preference indicates + // whether to prefer the router associated with this prefix + // over others, when multiple identical prefixes (for + // different routers) have been received. If the Reserved + // (10) value is received, the Route Information Option MUST + // be ignored. + continue + } + + ndp.handleOffLinkRouteDiscovery(offLinkRoute{dest: dest, router: ip}, opt.RouteLifetime(), prf) } // TODO(b/141556115): Do (MTU) Parameter Discovery. |