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cmd/containerboot: warn when an ingress proxy with an IPv4 tailnet address is being created for an IPv6 backend(s) (#12159)

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Updates tailscale/tailscale#12156

Signed-off-by: Irbe Krumina <irbe@tailscale.com>
This commit is contained in:
Irbe Krumina 2024-05-16 13:11:30 -04:00 committed by GitHub
parent 8feb4ff5d2
commit 76c30e014d
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1 changed files with 7 additions and 0 deletions
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7
cmd/containerboot/main.go
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@ -961,16 +961,23 @@ func installIngressForwardingRule(ctx context.Context, dstStr string, tsIPs []ne
return err
}
var local netip.Addr
proxyHasIPv4Address := false
for _, pfx := range tsIPs {
if !pfx.IsSingleIP() {
continue
}
if pfx.Addr().Is4() {
proxyHasIPv4Address = true
}
if pfx.Addr().Is4() != dst.Is4() {
continue
}
local = pfx.Addr()
break
}
if proxyHasIPv4Address && dst.Is6() {
log.Printf("Warning: proxy backend ClusterIP is an IPv6 address and the proxy has a IPv4 tailnet address. You might need to disable IPv4 address allocation for the proxy for forwarding to work. See https://github.com/tailscale/tailscale/issues/12156")
}
if !local.IsValid() {
return fmt.Errorf("no tailscale IP matching family of %s found in %v", dstStr, tsIPs)
}