Testing that a per-interface ubus data.firewall rule carrying src/dest zone
references is pinned to the publishing interface device (the netifd protocol
handler contract, e.g. 464xlat), while a rule that opts out with an empty
device ("device": "") instead resolves through its zone references. A rule
opting out without any zone reference would end up unscoped in a base chain
and is rejected with a diagnostic.

-- Testcase --
{%
	include("./root/usr/share/firewall4/main.uc", {
		getenv: function(varname) {
			switch (varname) {
			case 'ACTION':
				return 'print';
			}
		}
	})
%}
-- End --

-- File uci/helpers.json --
{}
-- End --

-- File fs/open~_sys_class_net_br-lan_flags.txt --
0x1103
-- End --

-- File fs/open~_sys_class_net_pppoe-wan_flags.txt --
0x1103
-- End --

-- File fs/open~_sys_class_net_tun0_flags.txt --
0x1103
-- End --

-- File ubus/network.interface~dump.json --
{
	"interface": [
		{
			"interface": "lan",
			"up": true,
			"l3_device": "br-lan",
			"proto": "static",
			"device": "br-lan",
			"ipv4-address": [ { "address": "192.168.1.1", "mask": 24 } ],
			"data": {}
		},
		{
			"interface": "wan",
			"up": true,
			"l3_device": "pppoe-wan",
			"proto": "pppoe",
			"device": "eth1",
			"ipv4-address": [ { "address": "10.11.12.194", "mask": 24 } ],
			"data": {}
		},
		{
			"interface": "tun",
			"up": true,
			"l3_device": "tun0",
			"proto": "none",
			"device": "tun0",
			"data": {
				"zone": "wan",
				"firewall": [
					{
						"type": "rule",
						"src": "wan",
						"dest": "lan",
						"proto": "tcp",
						"dest_port": "22",
						"target": "accept"
					},
					{
						"type": "rule",
						"src": "wan",
						"dest": "lan",
						"proto": "udp",
						"dest_port": "53",
						"target": "accept",
						"device": ""
					},
					{
						"type": "rule",
						"proto": "tcp",
						"dest_port": "8080",
						"target": "accept",
						"device": ""
					},
					{
						"type": "nat",
						"target": "SNAT",
						"dest": "lan",
						"snat_ip": "10.11.12.194",
						"device": ""
					}
				]
			}
		}
	]
}
-- End --

-- File uci/firewall.json --
{
	"defaults": [
		{
			"input": "ACCEPT",
			"output": "ACCEPT",
			"forward": "REJECT"
		}
	],
	"zone": [
		{
			"name": "lan",
			"input": "ACCEPT",
			"output": "ACCEPT",
			"forward": "ACCEPT",
			"network": "lan"
		},
		{
			"name": "wan",
			"input": "REJECT",
			"output": "ACCEPT",
			"forward": "REJECT",
			"masq": "1",
			"network": "wan"
		}
	]
}
-- End --

-- Expect stderr --
[!] ubus rule (ubus:tun[none] rule 2) must reference a zone when opting out of device binding, ignoring section
[!] ubus nat (ubus:tun[none] nat 3) must reference a zone when opting out of device binding, ignoring section
-- End --

-- Expect stdout --
table inet fw4
flush table inet fw4

table inet fw4 {
	#
	# Defines
	#

	define lan_devices = { "br-lan" }
	define lan_subnets = { 192.168.1.0/24 }

	define wan_devices = { "pppoe-wan", "tun0" }
	define wan_subnets = { 10.11.12.0/24 }


	#
	# User includes
	#

	include "/etc/nftables.d/*.nft"


	#
	# Filter rules
	#

	chain input {
		type filter hook input priority filter; policy accept;

		iif "lo" accept comment "!fw4: Accept traffic from loopback"

		ct state vmap { established : accept, related : accept } comment "!fw4: Handle inbound flows"
		iifname "br-lan" jump input_lan comment "!fw4: Handle lan IPv4/IPv6 input traffic"
		iifname { "pppoe-wan", "tun0" } jump input_wan comment "!fw4: Handle wan IPv4/IPv6 input traffic"
	}

	chain forward {
		type filter hook forward priority filter; policy drop;

		ct state vmap { established : accept, related : accept } comment "!fw4: Handle forwarded flows"
		iifname "br-lan" jump forward_lan comment "!fw4: Handle lan IPv4/IPv6 forward traffic"
		iifname { "pppoe-wan", "tun0" } jump forward_wan comment "!fw4: Handle wan IPv4/IPv6 forward traffic"
		jump handle_reject
	}

	chain output {
		type filter hook output priority filter; policy accept;

		oif "lo" accept comment "!fw4: Accept traffic towards loopback"

		ct state vmap { established : accept, related : accept } comment "!fw4: Handle outbound flows"
		oifname "br-lan" jump output_lan comment "!fw4: Handle lan IPv4/IPv6 output traffic"
		oifname { "pppoe-wan", "tun0" } jump output_wan comment "!fw4: Handle wan IPv4/IPv6 output traffic"
	}

	chain prerouting {
		type filter hook prerouting priority filter; policy accept;
		iifname "br-lan" jump helper_lan comment "!fw4: Handle lan IPv4/IPv6 helper assignment"
	}

	chain handle_reject {
		meta l4proto tcp reject with tcp reset comment "!fw4: Reject TCP traffic"
		reject with icmpx type port-unreachable comment "!fw4: Reject any other traffic"
	}

	chain input_lan {
		jump accept_from_lan
	}

	chain output_lan {
		jump accept_to_lan
	}

	chain forward_lan {
		jump accept_to_lan
	}

	chain helper_lan {
	}

	chain accept_from_lan {
		iifname "br-lan" counter accept comment "!fw4: accept lan IPv4/IPv6 traffic"
	}

	chain accept_to_lan {
		oifname "br-lan" counter accept comment "!fw4: accept lan IPv4/IPv6 traffic"
	}

	chain input_wan {
		jump reject_from_wan
	}

	chain output_wan {
		jump accept_to_wan
	}

	chain forward_wan {
		iifname "tun0" tcp dport 22 counter jump accept_to_lan comment "!fw4: ubus:tun[none] rule 0"
		udp dport 53 counter jump accept_to_lan comment "!fw4: ubus:tun[none] rule 1"
		jump reject_to_wan
	}

	chain accept_to_wan {
		meta nfproto ipv4 oifname { "pppoe-wan", "tun0" } ct state invalid counter drop comment "!fw4: Prevent NAT leakage"
		oifname { "pppoe-wan", "tun0" } counter accept comment "!fw4: accept wan IPv4/IPv6 traffic"
	}

	chain reject_from_wan {
		iifname { "pppoe-wan", "tun0" } counter jump handle_reject comment "!fw4: reject wan IPv4/IPv6 traffic"
	}

	chain reject_to_wan {
		oifname { "pppoe-wan", "tun0" } counter jump handle_reject comment "!fw4: reject wan IPv4/IPv6 traffic"
	}


	#
	# NAT rules
	#

	chain dstnat {
		type nat hook prerouting priority dstnat; policy accept;
	}

	chain srcnat {
		type nat hook postrouting priority srcnat; policy accept;
		oifname { "pppoe-wan", "tun0" } jump srcnat_wan comment "!fw4: Handle wan IPv4/IPv6 srcnat traffic"
	}

	chain srcnat_wan {
		meta nfproto ipv4 masquerade comment "!fw4: Masquerade IPv4 wan traffic"
	}


	#
	# Raw rules (notrack)
	#

	chain raw_prerouting {
		type filter hook prerouting priority raw; policy accept;
	}

	chain raw_output {
		type filter hook output priority raw; policy accept;
	}


	#
	# Mangle rules
	#

	chain mangle_prerouting {
		type filter hook prerouting priority mangle; policy accept;
	}

	chain mangle_postrouting {
		type filter hook postrouting priority mangle; policy accept;
	}

	chain mangle_input {
		type filter hook input priority mangle; policy accept;
	}

	chain mangle_output {
		type route hook output priority mangle; policy accept;
	}

	chain mangle_forward {
		type filter hook forward priority mangle; policy accept;
	}
}
-- End --