nftables/SOURCES/main.nft

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# Sample configuration for nftables service.
# Load this by calling 'nft -f /etc/nftables/main.nft'.
# Note about base chain priorities:
# The priority values used in these sample configs are
# offset by 20 in order to avoid ambiguity when firewalld
# is also running which uses an offset of 10. This means
# that packets will traverse firewalld first and if not
# dropped/rejected there will hit the chains defined here.
# Chains created by iptables, ebtables and arptables tools
# do not use an offset, so those chains are traversed first
# in any case.
# drop any existing nftables ruleset
flush ruleset
# a common table for both IPv4 and IPv6
table inet nftables_svc {
# protocols to allow
set allowed_protocols {
type inet_proto
elements = { icmp, icmpv6 }
}
# interfaces to accept any traffic on
set allowed_interfaces {
type ifname
elements = { "lo" }
}
# services to allow
set allowed_tcp_dports {
type inet_service
elements = { ssh, 9090 }
}
# this chain gathers all accept conditions
chain allow {
ct state established,related accept
meta l4proto @allowed_protocols accept
iifname @allowed_interfaces accept
tcp dport @allowed_tcp_dports accept
}
# base-chain for traffic to this host
chain INPUT {
type filter hook input priority filter + 20
policy accept
jump allow
reject with icmpx type port-unreachable
}
}
# By default, any forwarding traffic is allowed.
# Uncomment the following line to filter it based
# on the same criteria as input traffic.
#include "/etc/nftables/router.nft"
# Uncomment the following line to enable masquerading of
# forwarded traffic. May be used with or without router.nft.
#include "/etc/nftables/nat.nft"