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tailscale/net/interfaces
Denton Gentry ad288baaea net/interfaces: use IPv4 link local if nothing better
The only connectivity an AWS Lambda container has is an IPv4 link-local
169.254.x.x address using NAT:
12: vtarget_1@if11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
                    qdisc noqueue state UP group default qlen 1000
     link/ether 7e:1c:3f:00:00:00 brd ff:ff:ff:ff:ff:ff link-netnsid 1
     inet 169.254.79.1/32 scope global vtarget_1
     valid_lft forever preferred_lft forever

If there are no other IPv4/v6 addresses available, and we are running
in AWS Lambda, allow IPv4 169.254.x.x addresses to be used.

----

Similarly, a Google Cloud Run container's only connectivity is
a Unique Local Address fddf:3978:feb1:d745::c001/128.
If there are no other addresses available then allow IPv6
Unique Local Addresses to be used.
We actually did this in an earlier release, but now refactor it to
work the same way as the IPv4 link-local support is being done.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
3 years ago
..
interfaces.go net/interfaces: use IPv4 link local if nothing better 3 years ago
interfaces_darwin.go net/interface: remove darwin fetchRoutingTable workaround 3 years ago
interfaces_darwin_test.go net/interfaces: work around race fetching routing table 3 years ago
interfaces_default_route_test.go net/{interfaces,netns}: change which build tag means mac/ios Network/System Extension 3 years ago
interfaces_defaultrouteif_todo.go net/interfaces: merge darwin files for DefaultRouteInterface in sandbox 3 years ago
interfaces_linux.go interfaces: check correct error /proc/net/route 3 years ago
interfaces_linux_test.go net/{interfaces,netns}: change which build tag means mac/ios Network/System Extension 3 years ago
interfaces_test.go net/{interfaces,netcheck}: rename some fields, funcs 3 years ago
interfaces_windows.go net/interfaces: use windows API to get the default route instead of parsing `route print` output 3 years ago
interfaces_windows_test.go net/interfaces: quiet PAC detection logging in no-PAC case, add benchmark 4 years ago
route.h net/interfaces: use syscalls to find private gateway IP address 4 years ago