Maisem Ali 4d6a8224d5 util/linuxfw: fall back to nftables when iptables not found
When the desired netfilter mode was unset, we would always try
to use the `iptables` binary. In such cases if iptables was not found,
tailscaled would just crash as seen in #13440. To work around this, in those
cases check if the `iptables` binary even exists and if it doesn't fall back
to the nftables implementation.

Verified that it works on stock Ubuntu 24.04.

Updates #5621
Updates #8555
Updates #8762
Fixes #13440

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2024-09-11 14:36:17 -07:00
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