firewall: T970: Add firewall group domain-group

Domain group allows to filter addresses by domain main
Resolved addresses as elements are stored to named "nft set"
that used in the nftables rules
Also added a dynamic "resolver" systemd daemon
vyos-domain-group-resolve.service which starts python script
for the domain-group addresses resolving by timeout 300 sec

set firewall group domain-group DOMAINS address 'example.com'
set firewall group domain-group DOMAINS address 'example.org'
set firewall name FOO rule 10 action 'drop'
set firewall name FOO rule 10 source group domain-group 'DOMAINS'
set interfaces ethernet eth0 firewall local name 'FOO'

nft list table ip filter
table ip filter {
  set DOMAINS {
    type ipv4_addr
    flags interval
    elements = { 192.0.2.1, 192.0.2.85,
	         203.0.113.55, 203.0.113.58 }
  }
  chain NAME_FOO {
    ip saddr @DOMAINS counter packets 0 bytes 0 drop comment "FOO-10"
    counter packets 0 bytes 0 return comment "FOO default-action accept"
  }
}

1 files changed, 11 insertions, 0 deletions

diff --git a/src/systemd/vyos-domain-group-resolve.service b/src/systemd/vyos-domain-group-resolve.service
new file mode 100644
index 000000000..29628fddb
--- /dev/null
+++ b/src/systemd/vyos-domain-group-resolve.service
@@ -0,0 +1,11 @@
+[Unit]
+Description=VyOS firewall domain-group resolver
+After=vyos-router.service
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=/usr/bin/python3 /usr/libexec/vyos/vyos-domain-group-resolve.py
+
+[Install]
+WantedBy=multi-user.target