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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>		2 years ago
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art	all: cleanup unused code, part 2 (#10670)	2 years ago
connstats	net/connstats: exclude traffic with internal Tailscale service (#7904)	3 years ago
dns	all: cleanup unused code, part 2 (#10670)	2 years ago
dnscache	all: cleanup unused code, part 2 (#10670)	2 years ago
dnsfallback	net/dnsfallback: add singleflight to recursive resolver	2 years ago
flowtrack	all: update copyright and license headers	3 years ago
interfaces	net/interfaces: handle iOS network transitions (#10680)	2 years ago
memnet	net/memnet: export the network name (#9111)	2 years ago
netaddr	all: update copyright and license headers	3 years ago
netcheck	net/netcheck: use DERP frames as a signal for home region liveness	2 years ago
neterror	net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791)	3 years ago
netkernelconf	client/tailscale,ipn/{ipnlocal,localapi}: check UDP GRO config (#10071)	2 years ago
netknob	all: update copyright and license headers	3 years ago
netmon	all: cleanup unused code, part 2 (#10670)	2 years ago
netns	net/{interfaces,netmon}: remove "interesting", EqualFiltered API	2 years ago
netstat	net/{netns,netstat}: use new x/sys/cpu.IsBigEndian	3 years ago
netutil	all: cleanup unused code, part 2 (#10670)	2 years ago
packet	all: cleanup unused code, part 1 (#10661)	2 years ago
ping	net/ping: fix ICMP echo code field to 0	2 years ago
portmapper	net/portmapper: check returned epoch from PMP and PCP protocols	2 years ago
proxymux	all: cleanup unused code, part 1 (#10661)	2 years ago
routetable	all: cleanup unused code, part 2 (#10670)	2 years ago
socks5	net/socks5: add password auth support	3 years ago
sockstats	net/dns: retry forwarder requests over TCP	2 years ago
speedtest	all: update copyright and license headers	3 years ago
stun	wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration	3 years ago
tcpinfo	net/tcpinfo: add package to allow fetching TCP information	2 years ago
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tsdial	all: cleanup unused code, part 1 (#10661)	2 years ago
tshttpproxy	net/tshttpproxy: don't proxy through ourselves	3 years ago
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wsconn	net/wsconn: accept a remote addr string and plumb it through	2 years ago