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660a4608d2
Changed the mapping to store the transit IPs to be indexed by peer IP rather than NodeID because the data path only has access to the peer's IP. This change means that IPv4 transit IPs need to be indexed by the peer's IPv4 address, and IPv6 transit IPs need to be indexed by the peer's IPv6 address. It is an error if the peer does not have an address of the same family as the transit IP. It is also an error if the transit and destination IP families do not match. Added a check to ensure that the TransitIPRequest.App matches a configured app on the connector. Added additional TransitIPResponse codes to identify the new errors and change the exsting use of the Other code to use it's own specific code. Added logging for the error cases, since they generally indicate that a peer has constructed a bad request or that there is a config mismatch between the peer and the local netmap. Added a test framework for handleConnectorTransitIPRequest and moved the existing tests into the framework and added new tests. Fixes tailscale/corp#37143 Signed-off-by: George Jones <george@tailscale.com>