Merge branch 'nftables' into 'master'

nftables + dependencies: new packages

This MR contains APKBUILDs for nftables and its libnftnl dependency. APKBUILDs have been adapted and trimmed from Alpine; the OpenRC scripts come indirectly from Gentoo via Alpine.

Tested on x86_64 by NAT'ing a couple of VM's to the outside world.

See merge request !145

4 files changed, 232 insertions, 0 deletions

diff --git a/user/libnftnl/APKBUILD b/user/libnftnl/APKBUILD
new file mode 100644
index 000000000..432f60b07
--- /dev/null
+++ b/user/libnftnl/APKBUILD
@@ -0,0 +1,36 @@
+# Contributor: Sören Tempel <soeren+alpine@soeren-tempel.net>
+# Maintainer: multiplexd <multi@in-addr.xyz>
+pkgname=libnftnl
+pkgver=1.1.2
+pkgrel=0
+pkgdesc="Netfilter library providing interface to the nf_tables subsystem"
+url="https://netfilter.org/projects/libnftnl"
+arch="all"
+license="GPL-2.0+"
+makedepends="libmnl-dev"
+subpackages="$pkgname-dev"
+source="https://netfilter.org/projects/libnftnl/files/$pkgname-$pkgver.tar.bz2"
+
+build() {
+	cd "$builddir"
+	./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--localstatedir=/var
+	make
+}
+
+check() {
+	cd "$builddir"/tests
+	make check # builds test binaries
+}
+
+package() {
+	cd "$builddir"
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="808e0efd2ff32a65cca1e6113cc29aece1335364b94ad87438d19b0887d0bd34de11942fa411e4105ef153f2cce862ded17ebc441c413b839ac506471e530569  libnftnl-1.1.2.tar.bz2"
diff --git a/user/nftables/APKBUILD b/user/nftables/APKBUILD
new file mode 100644
index 000000000..3ef6d52aa
--- /dev/null
+++ b/user/nftables/APKBUILD
@@ -0,0 +1,45 @@
+# Contributor: Sören Tempel <soeren+alpine@soeren-tempel.net>
+# Contributor: Jakub Jirutka <jakub@jirutka.cz>
+# Contributor: Francesco Colista <fcolista@alpinelinux.org>
+# Maintainer: multiplexd <multi@in-addr.xyz>
+pkgname=nftables
+pkgver=0.9.0
+pkgrel=0
+pkgdesc="Netfilter tables userspace tools"
+url="https://netfilter.org/projects/nftables"
+options="!check" # no test suite
+arch="all"
+license="GPL-2.0+ AND GPL-2.0"
+makedepends="bison docbook2x flex gmp-dev libmnl-dev libnftnl-dev"
+subpackages="$pkgname-doc $pkgname-openrc"
+source="https://netfilter.org/projects/nftables/files/$pkgname-$pkgver.tar.bz2
+	nftables.confd
+	nftables.initd"
+
+build() {
+	cd "$builddir"
+
+	DB2MAN=docbook2x-man ./configure \
+		--build=$CBUILD \
+		--host=$CHOST \
+		--prefix=/usr \
+		--sysconfdir=/etc \
+		--mandir=/usr/share/man \
+		--infodir=/usr/share/info \
+		--localstatedir=/var \
+		--without-cli
+	make
+}
+
+package() {
+	cd "$builddir"
+
+	make DESTDIR="$pkgdir" install
+
+	install -Dm755 "$srcdir"/$pkgname.initd "$pkgdir"/etc/init.d/$pkgname
+	install -Dm644 "$srcdir"/$pkgname.confd "$pkgdir"/etc/conf.d/$pkgname
+}
+
+sha512sums="ba08fd78d79f7df14a7a7d753e8be33f22d892672ad906672d938c66a8fbb0824fd1d083c173132b7d81dd5e3cdd7771364ec714662876cb71eb4f7ad4eaa59c  nftables-0.9.0.tar.bz2
+4eb1adf003dfcaad65c91af6ca88d91b7904c471aefae67e7d3c2f8e053e1ac196d3437a45d1fed5a855b876a0f1fc58a724e381d2acf1164d9120cadee73eef  nftables.confd
+58daafb012b7cd0248a7db6e10f6a667e683347aaea7eaa78cb88780272f334e00913cea3fd39a22a4a72acc27fabd101944b40916f4b534ddeb509bd0232017  nftables.initd"
diff --git a/user/nftables/nftables.confd b/user/nftables/nftables.confd
new file mode 100644
index 000000000..87fa8f2ea
--- /dev/null
+++ b/user/nftables/nftables.confd
@@ -0,0 +1,24 @@
+# Configuration for /etc/init.d/nftables
+
+# Location of file with nftables rules to restore on service start,
+# and save rules to on service stop when $save_on_stop is enabled.
+#rules_file="/etc/firewall.nft"
+
+# Options to pass to nft on save.
+#save_options="-n"
+
+# Save state on stopping nftables.
+#save_on_stop="yes"
+
+# Enable IPv4/IPv6 forwarding with the rules?
+# Note: If you want to enable forwarding only on selected interfaces,
+# keep this disabled and enable forwarding using /etc/sysctl.conf.
+#enable_forwarding="no"
+
+# If you need to log nftables messages as soon as nftables starts,
+# AND your logger does NOT depend on the network, then you may wish
+# to uncomment the next line.
+# If your logger depends on the network, and you uncomment this line
+# you will create an unresolvable circular dependency during startup.
+# After commenting or uncommenting this line, you must run 'rc-update -u'.
+#rc_use="logger"
diff --git a/user/nftables/nftables.initd b/user/nftables/nftables.initd
new file mode 100644
index 000000000..c763b395d
--- /dev/null
+++ b/user/nftables/nftables.initd
@@ -0,0 +1,127 @@
+#!/sbin/openrc-run
+# Copyright 2014 Nicholas Vinson
+# Copyright 1999-2014 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+extra_commands="list panic save"
+extra_started_commands="reload"
+
+description="Manage nftable based firewall."
+description_save="Save current nftables rulesets to disk."
+description_list="Displays the current nftables ruleset."
+description_panic="Immediately drop all packets on all interfaces."
+description_reload="Clear current rulesets and load rulesets from the saved ruleset files."
+
+# Uppercase variables are there for backward compatibility.
+: ${rules_file:=${NFTABLES_SAVE:="/etc/firewall.nft"}}
+: ${save_options:=${SAVE_OPTIONS:="-n"}}
+: ${save_on_stop:=${SAVE_ON_STOP:="yes"}}
+: ${enable_forwarding:="no"}
+
+depend() {
+	need localmount
+	after sysctl
+	before net
+	provide firewall
+}
+
+start_pre() {
+	checkkernel && checkconfig
+}
+
+list() {
+	nft list ruleset
+}
+
+panic() {
+	checkkernel || return 1
+
+	if service_started "$RC_SVCNAME"; then
+		rc-service "$RC_SVCNAME" stop
+	fi
+
+	ebegin "Dropping all packets"
+	nft -f /dev/stdin <<-EOF
+		flush ruleset
+		table inet filter {
+		    chain input { type filter hook input priority 0; policy drop; }
+		    chain forward { type filter hook forward priority 0; policy drop; }
+		    chain output { type filter hook output priority 0; policy drop; }
+		}
+	EOF
+	eend $?
+}
+
+reload() {
+	start
+}
+
+save() {
+	ebegin "Saving nftables state"
+
+	checkpath -q -d "${rules_file%/*}"
+	checkpath -q -m 0600 -f "$rules_file"
+
+	local tmp_save="$rules_file.tmp"
+
+	echo 'flush ruleset' > "$tmp_save"
+	nft list ruleset >> "$tmp_save"; local retval=$?
+
+	[ $retval -eq 0 ] && mv "$tmp_save" "$rules_file"
+
+	return $retval
+}
+
+start() {
+	ebegin "Loading nftables state and starting firewall"
+
+	nft -f "$rules_file"
+	eend $? || return 1
+
+	if yesno "$enable_forwarding"; then
+		ebegin "Enabling forwarding"
+		forwarding 1
+		eend $? || return 1
+	fi
+}
+
+stop() {
+	if yesno "$save_on_stop"; then
+		save || return 1
+	fi
+
+	if yesno "$enable_forwarding"; then
+		ebegin "Disabling forwarding"
+		forwarding 0
+		eend $?
+	fi
+
+	ebegin "Stopping firewall"
+	nft flush ruleset
+	eend $?
+}
+
+checkconfig() {
+	if [ ! -f "$rules_file" ]; then
+		eerror "Not starting nftables. First create some rules then run:"
+		eerror "  rc-service nftables save"
+		return 1
+	fi
+	return 0
+}
+
+checkkernel() {
+	if ! nft list tables >/dev/null 2>&1; then
+		eerror "Your kernel lacks nftables support, please load"
+		eerror "appropriate modules and try again."
+		return 1
+	fi
+	return 0
+}
+
+forwarding() {
+	/sbin/sysctl -qw \
+		net.ipv4.ip_forward=$1 \
+		net.ipv6.conf.default.forwarding=$1 \
+		net.ipv6.conf.all.forwarding=$1
+}