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Mihai Parparita 6842c3c194 net/interfaces: redo how we get the default interface on macOS and iOS ... With #6566 we added an external mechanism for getting the default interface, and used it on macOS and iOS (see tailscale/corp#8201). The goal was to be able to get the default physical interface even when using an exit node (in which case the routing table would say that the Tailscale utun* interface is the default). However, the external mechanism turns out to be unreliable in some cases, e.g. when multiple cellular interfaces are present/toggled (I have occasionally gotten my phone into a state where it reports the pdp_ip1 interface as the default, even though it can't actually route traffic). It was observed that `ifconfig -v` on macOS reports an "effective interface" for the Tailscale utn* interface, which seems promising. By examining the ifconfig source code, it turns out that this is done via a SIOCGIFDELEGATE ioctl syscall. Though this is a private API, it appears to have been around for a long time (e.g. it's in the 10.13 xnu release at https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/net/if_types.h.auto.html) and thus is unlikely to go away. We can thus use this ioctl if the routing table says that a utun* interface is the default, and go back to the simpler mechanism that we had before #6566. Updates #7184 Updates #7188 Signed-off-by: Mihai Parparita <mihai@tailscale.com> (cherry picked from commit fa932fefe7)		3 years ago
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interfaces.go	net/interfaces: redo how we get the default interface on macOS and iOS	3 years ago
interfaces_bsd.go	net/interfaces: redo how we get the default interface on macOS and iOS	3 years ago
interfaces_darwin.go	net/interfaces: redo how we get the default interface on macOS and iOS	3 years ago
interfaces_darwin_test.go	net/interfaces: improve default route detection	3 years ago
interfaces_default_route_test.go	all: remove old +build tags	3 years ago
interfaces_defaultrouteif_todo.go	all: remove old +build tags	3 years ago
interfaces_freebsd.go	net/interfaces: redo how we get the default interface on macOS and iOS	3 years ago
interfaces_linux.go	syncs, all: move to using Go's new atomic types instead of ours	4 years ago
interfaces_linux_test.go	refactor: move from io/ioutil to io and os packages	3 years ago
interfaces_test.go	all: convert more code to use net/netip directly	4 years ago
interfaces_windows.go	go.mod: bump wireguard/windows, which moves to using net/netip	3 years ago
interfaces_windows_test.go	net/interfaces: quiet PAC detection logging in no-PAC case, add benchmark	5 years ago