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>
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