util/linuxfw: fix IPv6 nat for nftables (cherry-pick) #12123
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* util/linuxfw: fix IPv6 NAT availability check for nftables When running firewall in nftables mode, there is no need for a separate NAT availability check (unlike with iptables, there are no hosts that support nftables, but not IPv6 NAT - see #11353). This change fixes a firewall NAT availability check that was using the no-longer set ipv6NATAvailable field by removing the field and using a method that, for nftables, just checks that IPv6 is available. Updates #12008 Signed-off-by: Irbe Krumina <irbe@tailscale.com> (cherry picked from commit 7ef2f72)
irbekrm
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bradfitz
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May 14, 2024
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Cherry-pick of #12009