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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> |
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| connstats | ||
| dns | ||
| dnscache | ||
| dnsfallback | ||
| flowtrack | ||
| interfaces | ||
| memnet | ||
| netaddr | ||
| netcheck | ||
| neterror | ||
| netknob | ||
| netns | ||
| netstat | ||
| netutil | ||
| packet | ||
| ping | ||
| portmapper | ||
| proxymux | ||
| routetable | ||
| socks5 | ||
| speedtest | ||
| stun | ||
| tlsdial | ||
| tsaddr | ||
| tsdial | ||
| tshttpproxy | ||
| tstun | ||
| wsconn | ||