* mangle
-N ISTIO_OUTPUT
-N ISTIO_PRERT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_OUTPUT
-N ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A ISTIO_OUTPUT -d 169.254.7.127 -p tcp -m tcp -j ACCEPT
-A ISTIO_OUTPUT -p tcp -m mark --mark 0x111/0xfff -j ACCEPT

* mangle
-N ISTIO_PRERT
-N ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_PRERT -m mark --mark 0x539/0xfff -j CONNMARK --set-xmark 0x111/0xfff
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_PRERT
-N ISTIO_OUTPUT
-A OUTPUT -j ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A ISTIO_PRERT -s 169.254.7.127 -p tcp -m tcp -j ACCEPT

-A ISTIO_PRERT ! -d 127.0.0.1/32 -p tcp -m mark ! --mark 0x539/0xfff -j TPROXY --on-port 15006 --tproxy-mark 0x111/0xfff
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_OUTPUT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_OUTPUT -d 169.254.7.127 -p tcp -m tcp -j ACCEPT
-A ISTIO_OUTPUT ! -o lo -p udp -m mark ! --mark 0x539/0xfff -m udp --dport 53 -j REDIRECT --to-port 15053

* mangle
-N ISTIO_PRERT
-N ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_PRERT -m mark --mark 0x539/0xfff -j CONNMARK --set-xmark 0x111/0xfff
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_PRERT
-N ISTIO_OUTPUT
-A OUTPUT -j ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A ISTIO_PRERT -s 169.254.7.127 -p tcp -m tcp -j ACCEPT

-A ISTIO_PRERT ! -d 127.0.0.1/32 -p tcp -m mark ! --mark 0x539/0xfff -j TPROXY --on-port 15006 --tproxy-mark 0x111/0xfff
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_OUTPUT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_OUTPUT -d 169.254.7.127 -p tcp -m tcp -j ACCEPT
-A ISTIO_OUTPUT ! -o lo -p udp -m mark ! --mark 0x539/0xfff -m udp --dport 53 -j REDIRECT --to-port 15053

* mangle
-N ISTIO_OUTPUT
-N ISTIO_PRERT
-A PREROUTING -j ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
COMMIT
* nat
-N ISTIO_OUTPUT
-N ISTIO_PRERT
-A OUTPUT -j ISTIO_OUTPUT
-A PREROUTING -j ISTIO_PRERT
-A ISTIO_OUTPUT -d 169.254.7.127 -p tcp -m tcp -j ACCEPT
-A ISTIO_OUTPUT -p tcp -m mark --mark 0x111/0xfff -j ACCEPT

		)
	}

	// CLI: -A ISTIO_OUTPUT -m connmark --mark 0x111/0xfff -j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff
	//
	// DESC: Propagate/restore connmark (if we had one) for outbound
	iptablesBuilder.AppendRule(
		iptableslog.UndefinedCommand, ChainInpodOutput, iptablesconstants.MANGLE,
		"-m", "connmark",
		"--mark", inpodTproxyMark,
		"-j", "CONNMARK",
		"--restore-mark",

	when a new ztunnel connects with different uid, only propagate deletes to older ztunnels.
*/

type connMgr struct {
	connectionSet map[*ZtunnelConnection]struct{}
	latestConn    *ZtunnelConnection
	mu            sync.Mutex
}

func (c *connMgr) addConn(conn *ZtunnelConnection) {
	log.Debug("ztunnel connected")
	c.mu.Lock()
	defer c.mu.Unlock()
	c.connectionSet[conn] = struct{}{}