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Andrea Gottardo d9aeb30281 net/interfaces: handle iOS network transitions (#10680) ... Updates #8022 Updates #6075 On iOS, we currently rely on delegated interface information to figure out the default route interface. The NetworkExtension framework in iOS seems to set the delegate interface only once, upon the *creation* of the VPN tunnel. If a network transition (e.g. from Wi-Fi to Cellular) happens while the tunnel is connected, it will be ignored and we will still try to set Wi-Fi as the default route because the delegated interface is not getting updated as connectivity transitions. Here we work around this on the Swift side with a NWPathMonitor instance that observes the interface name of the first currently satisfied network path. Our Swift code will call into `UpdateLastKnownDefaultRouteInterface`, so we can rely on that when it is set. If for any reason the Swift machinery didn't work and we don't get any updates, here we also have some fallback logic: we try finding a hardcoded Wi-Fi interface called en0. If en0 is down, we fall back to cellular (pdp_ip0) as a last resort. This doesn't handle all edge cases like USB-Ethernet adapters or multiple Ethernet interfaces, but it is good enough to ensure connectivity isn't broken. I tested this on iPhones and iPads running iOS 17.1 and it appears to work. Switching between different cellular plans on a dual SIM configuration also works (the interface name remains pdp_ip0). Signed-off-by: Andrea Gottardo <andrea@tailscale.com>		10 months ago
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defaultroute_bsd.go	net/interfaces: handle iOS network transitions (#10680)	10 months ago
defaultroute_ios.go	net/interfaces: handle iOS network transitions (#10680)	10 months ago
interfaces.go	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP	11 months ago
interfaces_bsd.go	net/interfaces: handle iOS network transitions (#10680)	10 months ago
interfaces_darwin.go	ipn/ipnlocal: add delegated interface information to /interfaces PeerAPI handler	2 years ago
interfaces_darwin_test.go	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP	11 months ago
interfaces_default_route_test.go	all: update copyright and license headers	2 years ago
interfaces_defaultrouteif_todo.go	all: update copyright and license headers	2 years ago
interfaces_freebsd.go	net/interfaces: redo how we get the default interface on macOS and iOS	2 years ago
interfaces_linux.go	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP	11 months ago
interfaces_linux_test.go	all: use tstest.Replace more	2 years ago
interfaces_test.go	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP	11 months ago
interfaces_windows.go	net/interfaces: better handle multiple interfaces in LikelyHomeRouterIP	11 months ago
interfaces_windows_test.go	all: update copyright and license headers	2 years ago