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wgengine/router: make supportsV6NAT check catch more cases

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Updates #4459

Change-Id: Ic27621569d2739298e652769d10e38608c6012be
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2022-04-20 10:14:07 -07:00 committed by Brad Fitzpatrick
parent fc2f628d4c
commit 0ce67ccda6
1 changed files with 8 additions and 2 deletions
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10
wgengine/router/router_linux.go
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@ -1514,8 +1514,14 @@ func supportsV6NAT() bool {
// Can't read the file. Assume SNAT works.
return true
}
return bytes.Contains(bs, []byte("nat\n"))
if bytes.Contains(bs, []byte("nat\n")) {
return true
}
// In nftables mode, that proc file will be empty. Try another thing:
if exec.Command("modprobe", "ip6table_nat").Run() == nil {
return true
}
return false
}
func checkIPRuleSupportsV6(logf logger.Logf) error {