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ebc630c6c0
In May 2021, Azure App Services used 172.16.x.x addresses:
```
10: eth0@if11: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP
link/ether 02:42:ac:10:01:03 brd ff:ff:ff:ff:ff:ff
inet 172.16.1.3/24 brd 172.16.1.255 scope global eth0
valid_lft forever preferred_lft forever
```
Now it uses link-local:
```
2: eth0@if6: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP
link/ether 8a:30:1f:50:1d:23 brd ff:ff:ff:ff:ff:ff
inet 169.254.129.3/24 brd 169.254.129.255 scope global eth0
valid_lft forever preferred_lft forever
```
This is reasonable for them to choose to do, it just broke the handling in net/interfaces.
This PR proposes to:
1. Always allow link-local in LocalAddresses() if we have no better
address available.
2. Continue to make isUsableV4() conditional on an environment we know
requires it.
I don't love the idea of having to discover these environments one by
one, but I don't understand the consequences of making isUsableV4()
return true unconditionally. It makes isUsableV4() essentially always
return true and perform no function.
Fixes https://github.com/tailscale/tailscale/issues/7603
Signed-off-by: Denton Gentry <dgentry@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 | ||
| sockstats | ||
| speedtest | ||
| stun | ||
| tlsdial | ||
| tsaddr | ||
| tsdial | ||
| tshttpproxy | ||
| tstun | ||
| wsconn | ||