#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# End-to-end ipvs test suite
# Topology:
#--------------------------------------------------------------+
#                      |                                       |
#         ns0          |         ns1                           |
#      -----------     |     -----------    -----------        |
#      | veth01  | --------- | veth10  |    | veth12  |        |
#      -----------    peer   -----------    -----------        |
#           |          |                        |              |
#      -----------     |                        |              |
#      |  br0    |     |-----------------  peer |--------------|
#      -----------     |                        |              |
#           |          |                        |              |
#      ----------     peer   ----------      -----------       |
#      |  veth02 | --------- |  veth20 |     | veth21  |       |
#      ----------      |     ----------      -----------       |
#                      |         ns2                           |
#                      |                                       |
#--------------------------------------------------------------+
#
# We assume that all network driver are loaded
#

# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
ret=0
GREEN='\033[0;92m'
RED='\033[0;31m'
NC='\033[0m' # No Color

readonly port=8080

readonly vip_v4=207.175.44.110
readonly cip_v4=10.0.0.2
readonly gip_v4=10.0.0.1
readonly dip_v4=172.16.0.1
readonly rip_v4=172.16.0.2
readonly sip_v4=10.0.0.3

readonly infile="$(mktemp)"
readonly outfile="$(mktemp)"
readonly datalen=32

sysipvsnet="/proc/sys/net/ipv4/vs/"
if [ ! -d $sysipvsnet ]; then
	modprobe -q ip_vs
	if [ $? -ne 0 ]; then
		echo "skip: could not run test without ipvs module"
		exit $ksft_skip
	fi
fi

ip -Version > /dev/null 2>&1
if [ $? -ne 0 ]; then
	echo "SKIP: Could not run test without ip tool"
	exit $ksft_skip
fi

ipvsadm -v > /dev/null 2>&1
if [ $? -ne 0 ]; then
	echo "SKIP: Could not run test without ipvsadm"
	exit $ksft_skip
fi

setup() {
	ip netns add ns0
	ip netns add ns1
	ip netns add ns2

	ip link add veth01 netns ns0 type veth peer name veth10 netns ns1
	ip link add veth02 netns ns0 type veth peer name veth20 netns ns2
	ip link add veth12 netns ns1 type veth peer name veth21 netns ns2

	ip netns exec ns0 ip link set veth01 up
	ip netns exec ns0 ip link set veth02 up
	ip netns exec ns0 ip link add br0 type bridge
	ip netns exec ns0 ip link set veth01 master br0
	ip netns exec ns0 ip link set veth02 master br0
	ip netns exec ns0 ip link set br0 up
	ip netns exec ns0 ip addr add ${cip_v4}/24 dev br0

	ip netns exec ns1 ip link set lo up
	ip netns exec ns1 ip link set veth10 up
	ip netns exec ns1 ip addr add ${gip_v4}/24 dev veth10
	ip netns exec ns1 ip link set veth12 up
	ip netns exec ns1 ip addr add ${dip_v4}/24 dev veth12

	ip netns exec ns2 ip link set lo up
	ip netns exec ns2 ip link set veth21 up
	ip netns exec ns2 ip addr add ${rip_v4}/24 dev veth21
	ip netns exec ns2 ip link set veth20 up
	ip netns exec ns2 ip addr add ${sip_v4}/24 dev veth20

	sleep 1

	dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none
}

cleanup() {
	for i in 0 1 2
	do
		ip netns del ns$i > /dev/null 2>&1
	done

	if [ -f "${outfile}" ]; then
		rm "${outfile}"
	fi
	if [ -f "${infile}" ]; then
		rm "${infile}"
	fi
}

server_listen() {
	ip netns exec ns2 nc -l -p 8080 > "${outfile}" &
	server_pid=$!
	sleep 0.2
}

client_connect() {
	ip netns exec ns0 timeout 2 nc -w 1 ${vip_v4} ${port} < "${infile}"
}

verify_data() {
	wait "${server_pid}"
	cmp "$infile" "$outfile" 2>/dev/null
}

test_service() {
	server_listen
	client_connect
	verify_data
}


test_dr() {
	ip netns exec ns0 ip route add ${vip_v4} via ${gip_v4} dev br0

	ip netns exec ns1 sysctl -qw net.ipv4.ip_forward=1
	ip netns exec ns1 ipvsadm -A -t ${vip_v4}:${port} -s rr
	ip netns exec ns1 ipvsadm -a -t ${vip_v4}:${port} -r ${rip_v4}:${port}
	ip netns exec ns1 ip addr add ${vip_v4}/32 dev lo:1

	# avoid incorrect arp response
	ip netns exec ns2 sysctl -qw net.ipv4.conf.all.arp_ignore=1
	ip netns exec ns2 sysctl -qw net.ipv4.conf.all.arp_announce=2
	# avoid reverse route lookup
	ip netns exec ns2 sysctl -qw  net.ipv4.conf.all.rp_filter=0
	ip netns exec ns2 sysctl -qw  net.ipv4.conf.veth21.rp_filter=0
	ip netns exec ns2 ip addr add ${vip_v4}/32 dev lo:1

	test_service
}

test_nat() {
	ip netns exec ns0 ip route add ${vip_v4} via ${gip_v4} dev br0

	ip netns exec ns1 sysctl -qw net.ipv4.ip_forward=1
	ip netns exec ns1 ipvsadm -A -t ${vip_v4}:${port} -s rr
	ip netns exec ns1 ipvsadm -a -m -t ${vip_v4}:${port} -r ${rip_v4}:${port}
	ip netns exec ns1 ip addr add ${vip_v4}/32 dev lo:1

	ip netns exec ns2 ip link del veth20
	ip netns exec ns2 ip route add default via ${dip_v4} dev veth21

	test_service
}

test_tun() {
	ip netns exec ns0 ip route add ${vip_v4} via ${gip_v4} dev br0

	ip netns exec ns1 modprobe ipip
	ip netns exec ns1 ip link set tunl0 up
	ip netns exec ns1 sysctl -qw net.ipv4.ip_forward=0
	ip netns exec ns1 sysctl -qw net.ipv4.conf.all.send_redirects=0
	ip netns exec ns1 sysctl -qw net.ipv4.conf.default.send_redirects=0
	ip netns exec ns1 ipvsadm -A -t ${vip_v4}:${port} -s rr
	ip netns exec ns1 ipvsadm -a -i -t ${vip_v4}:${port} -r ${rip_v4}:${port}
	ip netns exec ns1 ip addr add ${vip_v4}/32 dev lo:1

	ip netns exec ns2 modprobe ipip
	ip netns exec ns2 ip link set tunl0 up
	ip netns exec ns2 sysctl -qw net.ipv4.conf.all.arp_ignore=1
	ip netns exec ns2 sysctl -qw net.ipv4.conf.all.arp_announce=2
	ip netns exec ns2 sysctl -qw net.ipv4.conf.all.rp_filter=0
	ip netns exec ns2 sysctl -qw net.ipv4.conf.tunl0.rp_filter=0
	ip netns exec ns2 sysctl -qw net.ipv4.conf.veth21.rp_filter=0
	ip netns exec ns2 ip addr add ${vip_v4}/32 dev lo:1

	test_service
}

run_tests() {
	local errors=

	echo "Testing DR mode..."
	cleanup
	setup
	test_dr
	errors=$(( $errors + $? ))

	echo "Testing NAT mode..."
	cleanup
	setup
	test_nat
	errors=$(( $errors + $? ))

	echo "Testing Tunnel mode..."
	cleanup
	setup
	test_tun
	errors=$(( $errors + $? ))

	return $errors
}

trap cleanup EXIT

run_tests

if [ $? -ne 0 ]; then
	echo -e "$(basename $0): ${RED}FAIL${NC}"
	exit 1
fi
echo -e "$(basename $0): ${GREEN}PASS${NC}"
exit 0