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authorGhanan Gowripalan <ghanan@google.com>2019-11-12 14:02:53 -0800
committergVisor bot <gvisor-bot@google.com>2019-11-12 14:09:43 -0800
commit5398530e45634b6f5ea4344d1a34b41cc8123457 (patch)
tree5201f9f48d30c8a27e4471bf41de90695a893d97 /test/syscalls/linux/mkdir.cc
parent57a2a5ea3359e0879f5e4cc40fdb9ad973c689a8 (diff)
Discover on-link prefixes from Router Advertisements' Prefix Information options
This change allows the netstack to do NDP's Prefix Discovery as outlined by RFC 4861 section 6.3.4. If configured to do so, when a new on-link prefix is discovered, the routing table will be updated with a device route through the nic the RA arrived at. Likewise, when such a prefix gets invalidated, the device route will be removed. Note, this change will not break existing uses of netstack as the default configuration for the stack options is set in such a way that Prefix Discovery will not be performed. See `stack.Options` and `stack.NDPConfigurations` for more details. This change reuses 1 option and introduces a new one that is required to take advantage of Prefix Discovery, all available under NDPConfigurations: - HandleRAs: Whether or not NDP RAs are processes - DiscoverOnLinkPrefixes: Whether or not Prefix Discovery is performed (new) Another note: for a NIC to process Prefix Information options (in Router Advertisements), it must not be a router itself. Currently the netstack does not have per-interface routing configuration; the routing/forwarding configuration is controlled stack-wide. Therefore, if the stack is configured to enable forwarding/routing, no router Advertisements (and by extension the Prefix Information options) will be processed. Tests: Unittest to make sure that Prefix Discovery and updates to the routing table only occur if explicitly configured to do so. Unittest to make sure at max stack.MaxDiscoveredOnLinkPrefixes discovered on-link prefixes are remembered. PiperOrigin-RevId: 280049278
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