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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>		11 months ago
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art	all: cleanup unused code, part 2 (#10670)	11 months ago
connstats	…
dns	all: cleanup unused code, part 2 (#10670)	11 months ago
dnscache	all: cleanup unused code, part 2 (#10670)	11 months ago
dnsfallback	net/dnsfallback: add singleflight to recursive resolver	1 year ago
flowtrack	…
interfaces	net/interfaces: handle iOS network transitions (#10680)	11 months ago
memnet	…
netaddr	…
netcheck	net/netcheck: use DERP frames as a signal for home region liveness	12 months ago
neterror	…
netkernelconf	…
netknob	…
netmon	all: cleanup unused code, part 2 (#10670)	11 months ago
netns	…
netstat	…
netutil	all: cleanup unused code, part 2 (#10670)	11 months ago
packet	all: cleanup unused code, part 1 (#10661)	11 months ago
ping	…
portmapper	net/portmapper: check returned epoch from PMP and PCP protocols	11 months ago
proxymux	all: cleanup unused code, part 1 (#10661)	11 months ago
routetable	all: cleanup unused code, part 2 (#10670)	11 months ago
socks5	…
sockstats	…
speedtest	…
stun	…
tcpinfo	…
tlsdial	…
tsaddr	all: cleanup unused code, part 1 (#10661)	11 months ago
tsdial	all: cleanup unused code, part 1 (#10661)	11 months ago
tshttpproxy	…
tstun	all: cleanup unused code, part 2 (#10670)	11 months ago
wsconn	…