1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# In-place tunneling 5 6BPF_FILE="test_tc_tunnel.bpf.o" 7# must match the port that the bpf program filters on 8readonly port=8000 9 10readonly ns_prefix="ns-$$-" 11readonly ns1="${ns_prefix}1" 12readonly ns2="${ns_prefix}2" 13 14readonly ns1_v4=192.168.1.1 15readonly ns2_v4=192.168.1.2 16readonly ns1_v6=fd::1 17readonly ns2_v6=fd::2 18 19# Must match port used by bpf program 20readonly udpport=5555 21# MPLSoverUDP 22readonly mplsudpport=6635 23readonly mplsproto=137 24 25readonly infile="$(mktemp)" 26readonly outfile="$(mktemp)" 27 28setup() { 29 ip netns add "${ns1}" 30 ip netns add "${ns2}" 31 32 ip link add dev veth1 mtu 1500 netns "${ns1}" type veth \ 33 peer name veth2 mtu 1500 netns "${ns2}" 34 35 ip netns exec "${ns1}" ethtool -K veth1 tso off 36 37 ip -netns "${ns1}" link set veth1 up 38 ip -netns "${ns2}" link set veth2 up 39 40 ip -netns "${ns1}" -4 addr add "${ns1_v4}/24" dev veth1 41 ip -netns "${ns2}" -4 addr add "${ns2_v4}/24" dev veth2 42 ip -netns "${ns1}" -6 addr add "${ns1_v6}/64" dev veth1 nodad 43 ip -netns "${ns2}" -6 addr add "${ns2_v6}/64" dev veth2 nodad 44 45 # clamp route to reserve room for tunnel headers 46 ip -netns "${ns1}" -4 route flush table main 47 ip -netns "${ns1}" -6 route flush table main 48 ip -netns "${ns1}" -4 route add "${ns2_v4}" mtu 1450 dev veth1 49 ip -netns "${ns1}" -6 route add "${ns2_v6}" mtu 1430 dev veth1 50 51 sleep 1 52 53 dd if=/dev/urandom of="${infile}" bs="${datalen}" count=1 status=none 54} 55 56cleanup() { 57 ip netns del "${ns2}" 58 ip netns del "${ns1}" 59 60 if [[ -f "${outfile}" ]]; then 61 rm "${outfile}" 62 fi 63 if [[ -f "${infile}" ]]; then 64 rm "${infile}" 65 fi 66 67 if [[ -n $server_pid ]]; then 68 kill $server_pid 2> /dev/null 69 fi 70} 71 72server_listen() { 73 ip netns exec "${ns2}" nc "${netcat_opt}" -l "${port}" > "${outfile}" & 74 server_pid=$! 75} 76 77client_connect() { 78 ip netns exec "${ns1}" timeout 2 nc "${netcat_opt}" -w 1 "${addr2}" "${port}" < "${infile}" 79 echo $? 80} 81 82verify_data() { 83 wait "${server_pid}" 84 server_pid= 85 # sha1sum returns two fields [sha1] [filepath] 86 # convert to bash array and access first elem 87 insum=($(sha1sum ${infile})) 88 outsum=($(sha1sum ${outfile})) 89 if [[ "${insum[0]}" != "${outsum[0]}" ]]; then 90 echo "data mismatch" 91 exit 1 92 fi 93} 94 95wait_for_port() { 96 for i in $(seq 20); do 97 if ip netns exec "${ns2}" ss ${2:--4}OHntl | grep -q "$1"; then 98 return 0 99 fi 100 sleep 0.1 101 done 102 return 1 103} 104 105set -e 106 107# no arguments: automated test, run all 108if [[ "$#" -eq "0" ]]; then 109 echo "ipip" 110 $0 ipv4 ipip none 100 111 112 echo "ipip6" 113 $0 ipv4 ipip6 none 100 114 115 echo "ip6ip6" 116 $0 ipv6 ip6tnl none 100 117 118 echo "sit" 119 $0 ipv6 sit none 100 120 121 echo "ip4 vxlan" 122 $0 ipv4 vxlan eth 2000 123 124 echo "ip6 vxlan" 125 $0 ipv6 ip6vxlan eth 2000 126 127 for mac in none mpls eth ; do 128 echo "ip gre $mac" 129 $0 ipv4 gre $mac 100 130 131 echo "ip6 gre $mac" 132 $0 ipv6 ip6gre $mac 100 133 134 echo "ip gre $mac gso" 135 $0 ipv4 gre $mac 2000 136 137 echo "ip6 gre $mac gso" 138 $0 ipv6 ip6gre $mac 2000 139 140 echo "ip udp $mac" 141 $0 ipv4 udp $mac 100 142 143 echo "ip6 udp $mac" 144 $0 ipv6 ip6udp $mac 100 145 146 echo "ip udp $mac gso" 147 $0 ipv4 udp $mac 2000 148 149 echo "ip6 udp $mac gso" 150 $0 ipv6 ip6udp $mac 2000 151 done 152 153 echo "OK. All tests passed" 154 exit 0 155fi 156 157if [[ "$#" -ne "4" ]]; then 158 echo "Usage: $0" 159 echo " or: $0 <ipv4|ipv6> <tuntype> <none|mpls|eth> <data_len>" 160 exit 1 161fi 162 163case "$1" in 164"ipv4") 165 readonly addr1="${ns1_v4}" 166 readonly addr2="${ns2_v4}" 167 readonly ipproto=4 168 readonly netcat_opt=-${ipproto} 169 readonly foumod=fou 170 readonly foutype=ipip 171 readonly fouproto=4 172 readonly fouproto_mpls=${mplsproto} 173 readonly gretaptype=gretap 174 ;; 175"ipv6") 176 readonly addr1="${ns1_v6}" 177 readonly addr2="${ns2_v6}" 178 readonly ipproto=6 179 readonly netcat_opt=-${ipproto} 180 readonly foumod=fou6 181 readonly foutype=ip6tnl 182 readonly fouproto="41 -6" 183 readonly fouproto_mpls="${mplsproto} -6" 184 readonly gretaptype=ip6gretap 185 ;; 186*) 187 echo "unknown arg: $1" 188 exit 1 189 ;; 190esac 191 192readonly tuntype=$2 193readonly mac=$3 194readonly datalen=$4 195 196echo "encap ${addr1} to ${addr2}, type ${tuntype}, mac ${mac} len ${datalen}" 197 198trap cleanup EXIT 199 200setup 201 202# basic communication works 203echo "test basic connectivity" 204server_listen 205wait_for_port ${port} ${netcat_opt} 206client_connect 207verify_data 208 209# clientside, insert bpf program to encap all TCP to port ${port} 210# client can no longer connect 211ip netns exec "${ns1}" tc qdisc add dev veth1 clsact 212ip netns exec "${ns1}" tc filter add dev veth1 egress \ 213 bpf direct-action object-file ${BPF_FILE} \ 214 section "encap_${tuntype}_${mac}" 215echo "test bpf encap without decap (expect failure)" 216server_listen 217wait_for_port ${port} ${netcat_opt} 218! client_connect 219 220if [[ "$tuntype" =~ "udp" ]]; then 221 # Set up fou tunnel. 222 ttype="${foutype}" 223 targs="encap fou encap-sport auto encap-dport $udpport" 224 # fou may be a module; allow this to fail. 225 modprobe "${foumod}" ||true 226 if [[ "$mac" == "mpls" ]]; then 227 dport=${mplsudpport} 228 dproto=${fouproto_mpls} 229 tmode="mode any ttl 255" 230 else 231 dport=${udpport} 232 dproto=${fouproto} 233 fi 234 ip netns exec "${ns2}" ip fou add port $dport ipproto ${dproto} 235 targs="encap fou encap-sport auto encap-dport $dport" 236elif [[ "$tuntype" =~ "gre" && "$mac" == "eth" ]]; then 237 ttype=$gretaptype 238elif [[ "$tuntype" =~ "vxlan" && "$mac" == "eth" ]]; then 239 ttype="vxlan" 240 targs="id 1 dstport 8472 udp6zerocsumrx" 241elif [[ "$tuntype" == "ipip6" ]]; then 242 ttype="ip6tnl" 243 targs="" 244else 245 ttype=$tuntype 246 targs="" 247fi 248 249# tunnel address family differs from inner for SIT 250if [[ "${tuntype}" == "sit" ]]; then 251 link_addr1="${ns1_v4}" 252 link_addr2="${ns2_v4}" 253elif [[ "${tuntype}" == "ipip6" ]]; then 254 link_addr1="${ns1_v6}" 255 link_addr2="${ns2_v6}" 256else 257 link_addr1="${addr1}" 258 link_addr2="${addr2}" 259fi 260 261# serverside, insert decap module 262# server is still running 263# client can connect again 264ip netns exec "${ns2}" ip link add name testtun0 type "${ttype}" \ 265 ${tmode} remote "${link_addr1}" local "${link_addr2}" $targs 266 267expect_tun_fail=0 268 269if [[ "$tuntype" == "ip6udp" && "$mac" == "mpls" ]]; then 270 # No support for MPLS IPv6 fou tunnel; expect failure. 271 expect_tun_fail=1 272elif [[ "$tuntype" =~ "udp" && "$mac" == "eth" ]]; then 273 # No support for TEB fou tunnel; expect failure. 274 expect_tun_fail=1 275elif [[ "$tuntype" =~ (gre|vxlan) && "$mac" == "eth" ]]; then 276 # Share ethernet address between tunnel/veth2 so L2 decap works. 277 ethaddr=$(ip netns exec "${ns2}" ip link show veth2 | \ 278 awk '/ether/ { print $2 }') 279 ip netns exec "${ns2}" ip link set testtun0 address $ethaddr 280elif [[ "$mac" == "mpls" ]]; then 281 modprobe mpls_iptunnel ||true 282 modprobe mpls_gso ||true 283 ip netns exec "${ns2}" sysctl -qw net.mpls.platform_labels=65536 284 ip netns exec "${ns2}" ip -f mpls route add 1000 dev lo 285 ip netns exec "${ns2}" ip link set lo up 286 ip netns exec "${ns2}" sysctl -qw net.mpls.conf.testtun0.input=1 287 ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.lo.rp_filter=0 288fi 289 290# Because packets are decapped by the tunnel they arrive on testtun0 from 291# the IP stack perspective. Ensure reverse path filtering is disabled 292# otherwise we drop the TCP SYN as arriving on testtun0 instead of the 293# expected veth2 (veth2 is where 192.168.1.2 is configured). 294ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.all.rp_filter=0 295# rp needs to be disabled for both all and testtun0 as the rp value is 296# selected as the max of the "all" and device-specific values. 297ip netns exec "${ns2}" sysctl -qw net.ipv4.conf.testtun0.rp_filter=0 298ip netns exec "${ns2}" ip link set dev testtun0 up 299if [[ "$expect_tun_fail" == 1 ]]; then 300 # This tunnel mode is not supported, so we expect failure. 301 echo "test bpf encap with tunnel device decap (expect failure)" 302 ! client_connect 303else 304 echo "test bpf encap with tunnel device decap" 305 client_connect 306 verify_data 307 server_listen 308fi 309 310# serverside, use BPF for decap 311ip netns exec "${ns2}" ip link del dev testtun0 312ip netns exec "${ns2}" tc qdisc add dev veth2 clsact 313ip netns exec "${ns2}" tc filter add dev veth2 ingress \ 314 bpf direct-action object-file ${BPF_FILE} section decap 315echo "test bpf encap with bpf decap" 316client_connect 317verify_data 318 319echo OK 320