selftests: net: vxlan: Add tests for vxlan nolocalbypass option.

Add test to make sure that the localbypass option is on by default.

Add test to change vxlan localbypass to nolocalbypass and check
that packets are delivered to userspace.
Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/Makefile

@@ -84,6 +84,7 @@ TEST_GEN_FILES += ip_local_port_range
 TEST_GEN_FILES += bind_wildcard
 TEST_PROGS += test_vxlan_mdb.sh
 TEST_PROGS += test_bridge_neigh_suppress.sh
+TEST_PROGS += test_vxlan_nolocalbypass.sh
 
 TEST_FILES := settings
 

tools/testing/selftests/net/test_vxlan_nolocalbypass.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This test is for checking the [no]localbypass VXLAN device option. The test
+# configures two VXLAN devices in the same network namespace and a tc filter on
+# the loopback device that drops encapsulated packets. The test sends packets
+# from the first VXLAN device and verifies that by default these packets are
+# received by the second VXLAN device. The test then enables the nolocalbypass
+# option and verifies that packets are no longer received by the second VXLAN
+# device.
+
+ret=0
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+TESTS="
+	nolocalbypass
+"
+VERBOSE=0
+PAUSE_ON_FAIL=no
+PAUSE=no
+
+################################################################################
+# Utilities
+
+log_test()
+{
+	local rc=$1
+	local expected=$2
+	local msg="$3"
+
+	if [ ${rc} -eq ${expected} ]; then
+		printf "TEST: %-60s  [ OK ]\n" "${msg}"
+		nsuccess=$((nsuccess+1))
+	else
+		ret=1
+		nfail=$((nfail+1))
+		printf "TEST: %-60s  [FAIL]\n" "${msg}"
+		if [ "$VERBOSE" = "1" ]; then
+			echo "    rc=$rc, expected $expected"
+		fi
+
+		if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+		echo
+			echo "hit enter to continue, 'q' to quit"
+			read a
+			[ "$a" = "q" ] && exit 1
+		fi
+	fi
+
+	if [ "${PAUSE}" = "yes" ]; then
+		echo
+		echo "hit enter to continue, 'q' to quit"
+		read a
+		[ "$a" = "q" ] && exit 1
+	fi
+
+	[ "$VERBOSE" = "1" ] && echo
+}
+
+run_cmd()
+{
+	local cmd="$1"
+	local out
+	local stderr="2>/dev/null"
+
+	if [ "$VERBOSE" = "1" ]; then
+		printf "COMMAND: $cmd\n"
+		stderr=
+	fi
+
+	out=$(eval $cmd $stderr)
+	rc=$?
+	if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+		echo "    $out"
+	fi
+
+	return $rc
+}
+
+tc_check_packets()
+{
+	local ns=$1; shift
+	local id=$1; shift
+	local handle=$1; shift
+	local count=$1; shift
+	local pkts
+
+	sleep 0.1
+	pkts=$(tc -n $ns -j -s filter show $id \
+		| jq ".[] | select(.options.handle == $handle) | \
+		.options.actions[0].stats.packets")
+	[[ $pkts == $count ]]
+}
+
+################################################################################
+# Setup
+
+setup()
+{
+	ip netns add ns1
+
+	ip -n ns1 link set dev lo up
+	ip -n ns1 address add 192.0.2.1/32 dev lo
+	ip -n ns1 address add 198.51.100.1/32 dev lo
+
+	ip -n ns1 link add name vx0 up type vxlan id 100 local 198.51.100.1 \
+		dstport 4789 nolearning
+	ip -n ns1 link add name vx1 up type vxlan id 100 dstport 4790
+}
+
+cleanup()
+{
+	ip netns del ns1 &> /dev/null
+}
+
+################################################################################
+# Tests
+
+nolocalbypass()
+{
+	local smac=00:01:02:03:04:05
+	local dmac=00:0a:0b:0c:0d:0e
+
+	run_cmd "bridge -n ns1 fdb add $dmac dev vx0 self static dst 192.0.2.1 port 4790"
+
+	run_cmd "tc -n ns1 qdisc add dev vx1 clsact"
+	run_cmd "tc -n ns1 filter add dev vx1 ingress pref 1 handle 101 proto all flower src_mac $smac dst_mac $dmac action pass"
+
+	run_cmd "tc -n ns1 qdisc add dev lo clsact"
+	run_cmd "tc -n ns1 filter add dev lo ingress pref 1 handle 101 proto ip flower ip_proto udp dst_port 4790 action drop"
+
+	run_cmd "ip -n ns1 -d link show dev vx0 | grep ' localbypass'"
+	log_test $? 0 "localbypass enabled"
+
+	run_cmd "ip netns exec ns1 mausezahn vx0 -a $smac -b $dmac -c 1 -p 100 -q"
+
+	tc_check_packets "ns1" "dev vx1 ingress" 101 1
+	log_test $? 0 "Packet received by local VXLAN device - localbypass"
+
+	run_cmd "ip -n ns1 link set dev vx0 type vxlan nolocalbypass"
+
+	run_cmd "ip -n ns1 -d link show dev vx0 | grep 'nolocalbypass'"
+	log_test $? 0 "localbypass disabled"
+
+	run_cmd "ip netns exec ns1 mausezahn vx0 -a $smac -b $dmac -c 1 -p 100 -q"
+
+	tc_check_packets "ns1" "dev vx1 ingress" 101 1
+	log_test $? 0 "Packet not received by local VXLAN device - nolocalbypass"
+
+	run_cmd "ip -n ns1 link set dev vx0 type vxlan localbypass"
+
+	run_cmd "ip -n ns1 -d link show dev vx0 | grep ' localbypass'"
+	log_test $? 0 "localbypass enabled"
+
+	run_cmd "ip netns exec ns1 mausezahn vx0 -a $smac -b $dmac -c 1 -p 100 -q"
+
+	tc_check_packets "ns1" "dev vx1 ingress" 101 2
+	log_test $? 0 "Packet received by local VXLAN device - localbypass"
+}
+
+################################################################################
+# Usage
+
+usage()
+{
+	cat <<EOF
+usage: ${0##*/} OPTS
+
+        -t <test>   Test(s) to run (default: all)
+                    (options: $TESTS)
+        -p          Pause on fail
+        -P          Pause after each test before cleanup
+        -v          Verbose mode (show commands and output)
+EOF
+}
+
+################################################################################
+# Main
+
+trap cleanup EXIT
+
+while getopts ":t:pPvh" opt; do
+	case $opt in
+		t) TESTS=$OPTARG ;;
+		p) PAUSE_ON_FAIL=yes;;
+		P) PAUSE=yes;;
+		v) VERBOSE=$(($VERBOSE + 1));;
+		h) usage; exit 0;;
+		*) usage; exit 1;;
+	esac
+done
+
+# Make sure we don't pause twice.
+[ "${PAUSE}" = "yes" ] && PAUSE_ON_FAIL=no
+
+if [ "$(id -u)" -ne 0 ];then
+	echo "SKIP: Need root privileges"
+	exit $ksft_skip;
+fi
+
+if [ ! -x "$(command -v ip)" ]; then
+	echo "SKIP: Could not run test without ip tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v bridge)" ]; then
+	echo "SKIP: Could not run test without bridge tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v mausezahn)" ]; then
+	echo "SKIP: Could not run test without mausezahn tool"
+	exit $ksft_skip
+fi
+
+if [ ! -x "$(command -v jq)" ]; then
+	echo "SKIP: Could not run test without jq tool"
+	exit $ksft_skip
+fi
+
+ip link help vxlan 2>&1 | grep -q "localbypass"
+if [ $? -ne 0 ]; then
+	echo "SKIP: iproute2 ip too old, missing VXLAN nolocalbypass support"
+	exit $ksft_skip
+fi
+
+cleanup
+
+for t in $TESTS
+do
+	setup; $t; cleanup;
+done
+
+if [ "$TESTS" != "none" ]; then
+	printf "\nTests passed: %3d\n" ${nsuccess}
+	printf "Tests failed: %3d\n"   ${nfail}
+fi
+
+exit $ret