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tailscale/net
History
Denton Gentry ebc630c6c0 net/interfaces: also allow link-local for AzureAppServices. 
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>
 		1 year ago
..
connstats net/connstats: fix ticker in NewStatistics (#7225) 1 year ago
dns various: pass logger.Logf through to more places 1 year ago
dnscache tstest: add method to Replace values for tests 1 year ago
dnsfallback various: pass logger.Logf through to more places 1 year ago
flowtrack all: update copyright and license headers 1 year ago
interfaces net/interfaces: also allow link-local for AzureAppServices. 1 year ago
memnet net/memnet: rename from net/nettest 1 year ago
netaddr all: update copyright and license headers 1 year ago
netcheck sockstats: switch label to enum 1 year ago
neterror all: update copyright and license headers 1 year ago
netknob all: update copyright and license headers 1 year ago
netns net/interfaces, net/netns: add node attributes to control default interface getting and binding 1 year ago
netstat net/{netns,netstat}: use new x/sys/cpu.IsBigEndian 1 year ago
netutil all: replace /kb/ links with /s/ equivalents 1 year ago
packet all: update copyright and license headers 1 year ago
ping all: update copyright and license headers 1 year ago
portmapper sockstats: switch label to enum 1 year ago
proxymux all: update copyright and license headers 1 year ago
routetable net/routetable: include unknown flags in the routetable doctor output 1 year ago
socks5 net/socks5: add password auth support 1 year ago
sockstats sockstats: remove per-interface stats from Get 1 year ago
speedtest all: update copyright and license headers 1 year ago
stun all: use Go 1.20's bytes.Clone 1 year ago
tlsdial health, net/tlsdial: add healthcheck for self-signed cert 1 year ago
tsaddr all: replace /kb/ links with /s/ equivalents 1 year ago
tsdial all: update copyright and license headers 1 year ago
tshttpproxy all: use tstest.Replace more 1 year ago
tstun wgengine: start logging DISCO frames to pcap stream 1 year ago
wsconn all: update copyright and license headers 1 year ago