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|
Testing that a source NAT rewrite range is accepted for proto icmp, where it
maps the ICMP identifier rather than a port. MAP-E portsets rely on this to
keep translated identifiers within the assigned port set (RFC 7597), with
one nat spec per proto in icmp/tcp/udp published by map.sh through the
per-interface ubus data.firewall array, and firewall3 accepted the same.
An ipv6-icmp rewrite implies the IPv6 family, and port match options still
require a UDP or TCP protocol.
-- 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_eth1_flags.txt --
0x1103
-- End --
-- File fs/open~_sys_class_net_map-wan_4_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": "eth1",
"proto": "dhcp",
"device": "eth1",
"ipv4-address": [ { "address": "10.11.12.194", "mask": 24 } ],
"data": {}
},
{
"interface": "wan_4",
"up": true,
"l3_device": "map-wan_4",
"proto": "map",
"device": "map-wan_4",
"data": {
"zone": "wan",
"firewall": [
{
"type": "nat",
"target": "SNAT",
"family": "inet",
"proto": "icmp",
"connlimit_ports": true,
"snat_ip": "192.0.2.66",
"snat_port": "2048-2079"
},
{
"type": "nat",
"target": "SNAT",
"family": "inet",
"proto": "tcp",
"connlimit_ports": true,
"snat_ip": "192.0.2.66",
"snat_port": "2048-2079"
},
{
"type": "nat",
"target": "SNAT",
"family": "inet",
"proto": "udp",
"connlimit_ports": true,
"snat_ip": "192.0.2.66",
"snat_port": "2048-2079"
}
]
}
}
]
}
-- 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",
"network": "wan"
}
],
"nat": [
{
"name": "ICMP id range",
"src": "wan",
"proto": "icmp",
"target": "SNAT",
"snat_ip": "192.0.2.67",
"snat_port": "4096-4127"
},
{
"name": "ICMPv6 id range",
"src": "wan",
"proto": "icmpv6",
"target": "SNAT",
"snat_ip": "2001:db8::1",
"snat_port": "4096-4127"
},
{
"name": "ICMP port match",
"src": "wan",
"proto": "icmp",
"target": "SNAT",
"snat_ip": "192.0.2.68",
"src_port": "1024-2047"
}
]
}
-- End --
-- Expect stderr --
[!] Section @nat[2] (ICMP port match) specifies ports but no UDP/TCP protocol, 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 = { "eth1", "map-wan_4" }
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 { "eth1", "map-wan_4" } 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 { "eth1", "map-wan_4" } 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 { "eth1", "map-wan_4" } 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"
iifname { "eth1", "map-wan_4" } jump helper_wan comment "!fw4: Handle wan 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 {
jump reject_to_wan
}
chain helper_wan {
}
chain accept_to_wan {
oifname { "eth1", "map-wan_4" } counter accept comment "!fw4: accept wan IPv4/IPv6 traffic"
}
chain reject_from_wan {
iifname { "eth1", "map-wan_4" } counter jump handle_reject comment "!fw4: reject wan IPv4/IPv6 traffic"
}
chain reject_to_wan {
oifname { "eth1", "map-wan_4" } 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;
meta nfproto ipv4 meta l4proto icmp oifname "map-wan_4" counter snat 192.0.2.66:2048-2079 comment "!fw4: ubus:wan_4[map] nat 0"
meta nfproto ipv4 meta l4proto tcp oifname "map-wan_4" counter snat 192.0.2.66:2048-2079 comment "!fw4: ubus:wan_4[map] nat 1"
meta nfproto ipv4 meta l4proto udp oifname "map-wan_4" counter snat 192.0.2.66:2048-2079 comment "!fw4: ubus:wan_4[map] nat 2"
oifname { "eth1", "map-wan_4" } jump srcnat_wan comment "!fw4: Handle wan IPv4/IPv6 srcnat traffic"
}
chain srcnat_wan {
meta nfproto ipv4 meta l4proto icmp counter snat 192.0.2.67:4096-4127 comment "!fw4: ICMP id range"
meta nfproto ipv6 meta l4proto ipv6-icmp counter snat [2001:db8::1]:4096-4127 comment "!fw4: ICMPv6 id range"
}
#
# 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 --
|
