1 files changed, 290 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh b/tools/testing/selftests/bpf/test_tc_tunnel.sh
new file mode 100755
index 000000000000..ff0d31d38061
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_tc_tunnel.sh
@@ -0,0 +1,290 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# In-place tunneling
+
+# must match the port that the bpf program filters on
+readonly port=8000
+
+readonly ns_prefix="ns-$$-"
+readonly ns1="${ns_prefix}1"
+readonly ns2="${ns_prefix}2"
+
+readonly ns1_v4=192.168.1.1
+readonly ns2_v4=192.168.1.2
+readonly ns1_v6=fd::1
+readonly ns2_v6=fd::2
+
+# Must match port used by bpf program
+readonly udpport=5555
+# MPLSoverUDP
+readonly mplsudpport=6635
+readonly mplsproto=137
+
+readonly infile="$(mktemp)"
+readonly outfile="$(mktemp)"
+
+setup() {
+	ip netns add "${ns1}"
+	ip netns add "${ns2}"
+
+	ip link add dev veth1 mtu 1500 netns "${ns1}" type veth \
+	      peer name veth2 mtu 1500 netns "${ns2}"
+
+	ip netns exec "${ns1}" ethtool -K veth1 tso off
+
+	ip -netns "${ns1}" link set veth1 up
+	ip -netns "${ns2}" link set veth2 up
+
+	ip -netns "${ns1}" -4 addr add "${ns1_v4}/24" dev veth1
+	ip -netns "${ns2}" -4 addr add "${ns2_v4}/24" dev veth2
+	ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad
+	ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad
+
+	# clamp route to reserve room for tunnel headers
+	ip -netns "${ns1}" -4 route flush table main
+	ip -netns "${ns1}" -6 route flush table main
+	ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1458 dev veth1
+	ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1438 dev veth1
+
+	sleep 1
+
+	dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
+}
+
+cleanup() {
+	ip netns del "${ns2}"
+	ip netns del "${ns1}"
+
+	if [[ -f "${outfile}" ]]; then
+		rm "${outfile}"
+	fi
+	if [[ -f "${infile}" ]]; then
+		rm "${infile}"
+	fi
+}
+
+server_listen() {
+	ip netns exec "${ns2}" nc "${netcat_opt}" -l -p "${port}" > "${outfile}" &
+	server_pid=$!
+	sleep 0.2
+}
+
+client_connect() {
+	ip netns exec "${ns1}" timeout 2 nc "${netcat_opt}" -w 1 "${addr2}" "${port}" < "${infile}"
+	echo $?
+}
+
+verify_data() {
+	wait "${server_pid}"
+	# sha1sum returns two fields [sha1] [filepath]
+	# convert to bash array and access first elem
+	insum=($(sha1sum ${infile}))
+	outsum=($(sha1sum ${outfile}))
+	if [[ "${insum[0]}" != "${outsum[0]}" ]]; then
+		echo "data mismatch"
+		exit 1
+	fi
+}
+
+set -e
+
+# no arguments: automated test, run all
+if [[ "$#" -eq "0" ]]; then
+	echo "ipip"
+	$0 ipv4 ipip none 100
+
+	echo "ip6ip6"
+	$0 ipv6 ip6tnl none 100
+
+	echo "sit"
+	$0 ipv6 sit none 100
+
+	for mac in none mpls eth ; do
+		echo "ip gre $mac"
+		$0 ipv4 gre $mac 100
+
+		echo "ip6 gre $mac"
+		$0 ipv6 ip6gre $mac 100
+
+		echo "ip gre $mac gso"
+		$0 ipv4 gre $mac 2000
+
+		echo "ip6 gre $mac gso"
+		$0 ipv6 ip6gre $mac 2000
+
+		echo "ip udp $mac"
+		$0 ipv4 udp $mac 100
+
+		echo "ip6 udp $mac"
+		$0 ipv6 ip6udp $mac 100
+
+		echo "ip udp $mac gso"
+		$0 ipv4 udp $mac 2000
+
+		echo "ip6 udp $mac gso"
+		$0 ipv6 ip6udp $mac 2000
+	done
+
+	echo "OK. All tests passed"
+	exit 0
+fi
+
+if [[ "$#" -ne "4" ]]; then
+	echo "Usage: $0"
+	echo "   or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>"
+	exit 1
+fi
+
+case "$1" in
+"ipv4")
+	readonly addr1="${ns1_v4}"
+	readonly addr2="${ns2_v4}"
+	readonly ipproto=4
+	readonly netcat_opt=-${ipproto}
+	readonly foumod=fou
+	readonly foutype=ipip
+	readonly fouproto=4
+	readonly fouproto_mpls=${mplsproto}
+	readonly gretaptype=gretap
+	;;
+"ipv6")
+	readonly addr1="${ns1_v6}"
+	readonly addr2="${ns2_v6}"
+	readonly ipproto=6
+	readonly netcat_opt=-${ipproto}
+	readonly foumod=fou6
+	readonly foutype=ip6tnl
+	readonly fouproto="41 -6"
+	readonly fouproto_mpls="${mplsproto} -6"
+	readonly gretaptype=ip6gretap
+	;;
+*)
+	echo "unknown arg: $1"
+	exit 1
+	;;
+esac
+
+readonly tuntype=$2
+readonly mac=$3
+readonly datalen=$4
+
+echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}"
+
+trap cleanup EXIT
+
+setup
+
+# basic communication works
+echo "test basic connectivity"
+server_listen
+client_connect
+verify_data
+
+# clientside, insert bpf program to encap all TCP to port ${port}
+# client can no longer connect
+ip netns exec "${ns1}" tc qdisc add dev veth1 clsact
+ip netns exec "${ns1}" tc filter add dev veth1 egress \
+	bpf direct-action object-file ./test_tc_tunnel.o \
+	section "encap_${tuntype}_${mac}"
+echo "test bpf encap without decap (expect failure)"
+server_listen
+! client_connect
+
+if [[ "$tuntype" =~ "udp" ]]; then
+	# Set up fou tunnel.
+	ttype="${foutype}"
+	targs="encap fou encap-sport auto encap-dport $udpport"
+	# fou may be a module; allow this to fail.
+	modprobe "${foumod}" ||true
+	if [[ "$mac" == "mpls" ]]; then
+		dport=${mplsudpport}
+		dproto=${fouproto_mpls}
+		tmode="mode any ttl 255"
+	else
+		dport=${udpport}
+		dproto=${fouproto}
+	fi
+	ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto}
+	targs="encap fou encap-sport auto encap-dport $dport"
+elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
+	ttype=$gretaptype
+else
+	ttype=$tuntype
+	targs=""
+fi
+
+# tunnel address family differs from inner for SIT
+if [[ "${tuntype}" == "sit" ]]; then
+	link_addr1="${ns1_v4}"
+	link_addr2="${ns2_v4}"
+else
+	link_addr1="${addr1}"
+	link_addr2="${addr2}"
+fi
+
+# serverside, insert decap module
+# server is still running
+# client can connect again
+ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \
+	${tmode} remote "${link_addr1}" local "${link_addr2}" $targs
+
+expect_tun_fail=0
+
+if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then
+	# No support for MPLS IPv6 fou tunnel; expect failure.
+	expect_tun_fail=1
+elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then
+	# No support for TEB fou tunnel; expect failure.
+	expect_tun_fail=1
+elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then
+	# Share ethernet address between tunnel/veth2 so L2 decap works.
+	ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \
+		  awk '/ether/ { print $2 }')
+	ip netns exec "${ns2}" ip link set testtun0 address $ethaddr
+elif [[ "$mac" == "mpls" ]]; then
+	modprobe mpls_iptunnel ||true
+	modprobe mpls_gso ||true
+	ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536
+	ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo
+	ip netns exec "${ns2}" ip link set lo up
+	ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1
+	ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0
+fi
+
+# Because packets are decapped by the tunnel they arrive on testtun0 from
+# the IP stack perspective.  Ensure reverse path filtering is disabled
+# otherwise we drop the TCP SYN as arriving on testtun0 instead of the
+# expected veth2 (veth2 is where 192.168.1.2 is configured).
+ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0
+# rp needs to be disabled for both all and testtun0 as the rp value is
+# selected as the max of the "all" and device-specific values.
+ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0
+ip netns exec "${ns2}" ip link set dev testtun0 up
+if [[ "$expect_tun_fail" == 1 ]]; then
+	# This tunnel mode is not supported, so we expect failure.
+	echo "test bpf encap with tunnel device decap (expect failure)"
+	! client_connect
+else
+	echo "test bpf encap with tunnel device decap"
+	client_connect
+	verify_data
+	server_listen
+fi
+
+# bpf_skb_net_shrink does not take tunnel flags yet, cannot update L3.
+if [[ "${tuntype}" == "sit" ]]; then
+	echo OK
+	exit 0
+fi
+
+# serverside, use BPF for decap
+ip netns exec "${ns2}" ip link del dev testtun0
+ip netns exec "${ns2}" tc qdisc add dev veth2 clsact
+ip netns exec "${ns2}" tc filter add dev veth2 ingress \
+	bpf direct-action object-file ./test_tc_tunnel.o section decap
+echo "test bpf encap with bpf decap"
+client_connect
+verify_data
+
+echo OK