A dot is a valid character in interface names and is often used in the
names of VLAN interfaces. The sysctl net.ipv6.conf.<ifname>.disable_ipv6
key path cannot use dots both in the ifname and as path separator.
We switch to using / as key path separator so dots are allowed in the
ifname.
This works because sysctl.Sysctl() accepts key paths with either dots
or slashes as separators.
Also, print error message to stderr in case sysctl cannot be read
instead of silently hiding the error.
Signed-off-by: David Verbeiren <david.verbeiren@tessares.net>
If CNI is about to configure an IPv6 address, make sure IPv6 is not
disabled through the "disable_ipv6" sysctl setting.
This is a workaround for Docker 17.06 and later which sets
disable_ipv6=1 for all interfaces even if ipv6 is enabled in Docker.
This change improves the performance of the ipam.ConfigureIface.
Some plugins are slow because of the ip.SettleAddress in ipam.ConfigureIface.
It seems to be only needed for IPv6, so should be skipped if only IPv4 is used.
- start list of linux_only plugins; ignore them when testing on Windows
- Isolate linux-only code by filename suffix
- Remove stub (NotImplemented) functions
- other misc. fixes for Windows compatibility
