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#!/sbin/openrc-run
# Copyright 2018 William Vigolo da Silva
# Copyright 2014-2017 Nicholas Vinson
# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
extra_commands="flush list panic save"
extra_started_commands="reload"
depend() {
need localmount
before net
}
start_pre() {
checkkernel && checkconfig && return 0
return 1
}
flush() {
nft flush ruleset || return 1
}
list() {
nft list ruleset || return 1
}
_panic() {
yesno "${PANIC_ON_FAIL:-yes}" && checkkernel && checkconfig && panic
return $?
}
panic() {
if service_started "${RC_SVCNAME}"; then
rc-service "${RC_SVCNAME}" stop
fi
ebegin "Dropping all packets"
flush
for protocol in ip ip6; do
nft create table $protocol filter 2>/dev/null || continue
nft -f /dev/stdin <<-EOF
table $protocol filter {
chain input { type filter hook input priority 0; drop; }
chain forward { type filter hook forward priority 0; drop; }
chain output { type filter hook output priority 0; drop; }
}
EOF
done
}
reload() {
start_pre || return 1
ebegin "Flushing firewall"
flush
start
}
save() {
ebegin "Saving nftables ruleset"
checkpath -q -d "$(dirname "${NFTABLES_CONFIG}")"
checkpath -q -m 0700 -f "${NFTABLES_CONFIG}"
echo "#!/bin/nft -f" >"${NFTABLES_CONFIG}"
nft ${SAVE_OPTIONS} list ruleset >>"${NFTABLES_CONFIG}"
return $?
}
start() {
ebegin "Loading ruleset and starting firewall"
flush
nft -f "${NFTABLES_CONFIG}" || _panic
eend $?
}
stop() {
yesno "${SAVE_ON_STOP:-no}" && (save || return 1)
ebegin "Stopping firewall"
flush
eend $?
}
checkconfig() {
[ -r "${NFTABLES_CONFIG}" ] && return 0
eerror "Could not read configuration file '${NFTABLES_CONFIG}'"
eerror "Populate it or use a different file by setting \$NFTABLES_CONFIG in"
eerror "the service configuration file"
eerror "Alternatively, create some rules and then run:"
eerror "rc-service ${RC_SVCNAME} save"
return 1
}
checkkernel() {
(nft list tables >/dev/null 2>&1) && return 0
eerror "Your kernel lacks nftables support, please load"
eerror "appropriate modules and try again."
return 1
}
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