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021de2e1bc
When IPv6 is unavailable on a system, AddConnmarkSaveRule() and
DelConnmarkSaveRule() would panic with a nil pointer dereference.
Both methods directly iterated over []iptablesInterface{i.ipt4, i.ipt6}
without checking if ipt6 was nil.
Use `getTables()` instead to properly retrieve the available tables
on a given system
Fixes #3310
Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>