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net/interfaces: use IPv4 link local if nothing better

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The only connectivity an AWS Lambda container has is an IPv4 link-local
169.254.x.x address using NAT:
12: vtarget_1@if11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
                    qdisc noqueue state UP group default qlen 1000
     link/ether 7e:1c:3f:00:00:00 brd ff:ff:ff:ff:ff:ff link-netnsid 1
     inet 169.254.79.1/32 scope global vtarget_1
     valid_lft forever preferred_lft forever

If there are no other IPv4/v6 addresses available, and we are running
in AWS Lambda, allow IPv4 169.254.x.x addresses to be used.

----

Similarly, a Google Cloud Run container's only connectivity is
a Unique Local Address fddf:3978:feb1:d745::c001/128.
If there are no other addresses available then allow IPv6
Unique Local Addresses to be used.
We actually did this in an earlier release, but now refactor it to
work the same way as the IPv4 link-local support is being done.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2021-06-15 13:42:18 -07:00
committed by Denton Gentry
parent 3687e5352b
commit ad288baaea
3 changed files with 60 additions and 10 deletions
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4
cmd/tailscaled/depaware.txt
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@@ -81,7 +81,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/derp/derpmap from tailscale.com/cmd/tailscaled+
tailscale.com/disco from tailscale.com/derp+
tailscale.com/health from tailscale.com/control/controlclient+
L tailscale.com/hostinfo from tailscale.com/control/controlclient
tailscale.com/hostinfo from tailscale.com/control/controlclient+
tailscale.com/internal/deephash from tailscale.com/ipn/ipnlocal+
tailscale.com/ipn from tailscale.com/ipn/ipnserver+
tailscale.com/ipn/ipnlocal from tailscale.com/ipn/ipnserver+
@@ -137,7 +137,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/util/dnsname from tailscale.com/ipn/ipnstate+
LW tailscale.com/util/endian from tailscale.com/net/netns+
tailscale.com/util/groupmember from tailscale.com/ipn/ipnserver
L tailscale.com/util/lineread from tailscale.com/control/controlclient+
tailscale.com/util/lineread from tailscale.com/control/controlclient+
tailscale.com/util/osshare from tailscale.com/cmd/tailscaled+
tailscale.com/util/pidowner from tailscale.com/ipn/ipnserver
tailscale.com/util/racebuild from tailscale.com/logpolicy