samples/bpf/test_lwt_bpf.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 # Uncomment to see generated bytecode
   5 #VERBOSE=verbose
   6
   7 NS1=lwt_ns1
   8 NS2=lwt_ns2
   9 VETH0=tst_lwt1a
  10 VETH1=tst_lwt1b
  11 VETH2=tst_lwt2a
  12 VETH3=tst_lwt2b
  13 IPVETH0="192.168.254.1"
  14 IPVETH1="192.168.254.2"
  15 IPVETH1b="192.168.254.3"
  16
  17 IPVETH2="192.168.111.1"
  18 IPVETH3="192.168.111.2"
  19
  20 IP_LOCAL="192.168.99.1"
  21
  22 TRACE_ROOT=/sys/kernel/debug/tracing
  23
  24 function lookup_mac()
  25 {
  26         set +x
  27         if [ ! -z "$2" ]; then
  28                 MAC=$(ip netns exec $2 ip link show $1 | grep ether | awk '{print $2}')
  29         else
  30                 MAC=$(ip link show $1 | grep ether | awk '{print $2}')
  31         fi
  32         MAC="${MAC//:/}"
  33         echo "0x${MAC:10:2}${MAC:8:2}${MAC:6:2}${MAC:4:2}${MAC:2:2}${MAC:0:2}"
  34         set -x
  35 }
  36
  37 function cleanup {
  38         set +ex
  39         rm test_lwt_bpf.o 2> /dev/null
  40         ip link del $VETH0 2> /dev/null
  41         ip link del $VETH1 2> /dev/null
  42         ip link del $VETH2 2> /dev/null
  43         ip link del $VETH3 2> /dev/null
  44         ip netns exec $NS1 killall netserver
  45         ip netns delete $NS1 2> /dev/null
  46         ip netns delete $NS2 2> /dev/null
  47         set -ex
  48 }
  49
  50 function setup_one_veth {
  51         ip netns add $1
  52         ip link add $2 type veth peer name $3
  53         ip link set dev $2 up
  54         ip addr add $4/24 dev $2
  55         ip link set $3 netns $1
  56         ip netns exec $1 ip link set dev $3 up
  57         ip netns exec $1 ip addr add $5/24 dev $3
  58
  59         if [ "$6" ]; then
  60                 ip netns exec $1 ip addr add $6/32 dev $3
  61         fi
  62 }
  63
  64 function get_trace {
  65         set +x
  66         cat ${TRACE_ROOT}/trace | grep -v '^#'
  67         set -x
  68 }
  69
  70 function cleanup_routes {
  71         ip route del ${IPVETH1}/32 dev $VETH0 2> /dev/null || true
  72         ip route del table local local ${IP_LOCAL}/32 dev lo 2> /dev/null || true
  73 }
  74
  75 function install_test {
  76         cleanup_routes
  77         cp /dev/null ${TRACE_ROOT}/trace
  78
  79         OPTS="encap bpf headroom 14 $1 obj test_lwt_bpf.o section $2 $VERBOSE"
  80
  81         if [ "$1" == "in" ];  then
  82                 ip route add table local local ${IP_LOCAL}/32 $OPTS dev lo
  83         else
  84                 ip route add ${IPVETH1}/32 $OPTS dev $VETH0
  85         fi
  86 }
  87
  88 function remove_prog {
  89         if [ "$1" == "in" ];  then
  90                 ip route del table local local ${IP_LOCAL}/32 dev lo
  91         else
  92                 ip route del ${IPVETH1}/32 dev $VETH0
  93         fi
  94 }
  95
  96 function filter_trace {
  97         # Add newline to allow starting EXPECT= variables on newline
  98         NL=$'\n'
  99         echo "${NL}$*" | sed -e 's/^.*: : //g'
 100 }
 101
 102 function expect_fail {
 103         set +x
 104         echo "FAIL:"
 105         echo "Expected: $1"
 106         echo "Got: $2"
 107         set -x
 108         exit 1
 109 }
 110
 111 function match_trace {
 112         set +x
 113         RET=0
 114         TRACE=$1
 115         EXPECT=$2
 116         GOT="$(filter_trace "$TRACE")"
 117
 118         [ "$GOT" != "$EXPECT" ] && {
 119                 expect_fail "$EXPECT" "$GOT"
 120                 RET=1
 121         }
 122         set -x
 123         return $RET
 124 }
 125
 126 function test_start {
 127         set +x
 128         echo "----------------------------------------------------------------"
 129         echo "Starting test: $*"
 130         echo "----------------------------------------------------------------"
 131         set -x
 132 }
 133
 134 function failure {
 135         get_trace
 136         echo "FAIL: $*"
 137         exit 1
 138 }
 139
 140 function test_ctx_xmit {
 141         test_start "test_ctx on lwt xmit"
 142         install_test xmit test_ctx
 143         ping -c 3 $IPVETH1 || {
 144                 failure "test_ctx xmit: packets are dropped"
 145         }
 146         match_trace "$(get_trace)" "
 147 len 84 hash 0 protocol 8
 148 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
 149 len 84 hash 0 protocol 8
 150 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
 151 len 84 hash 0 protocol 8
 152 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX" || exit 1
 153         remove_prog xmit
 154 }
 155
 156 function test_ctx_out {
 157         test_start "test_ctx on lwt out"
 158         install_test out test_ctx
 159         ping -c 3 $IPVETH1 || {
 160                 failure "test_ctx out: packets are dropped"
 161         }
 162         match_trace "$(get_trace)" "
 163 len 84 hash 0 protocol 0
 164 cb 1234 ingress_ifindex 0 ifindex 0
 165 len 84 hash 0 protocol 0
 166 cb 1234 ingress_ifindex 0 ifindex 0
 167 len 84 hash 0 protocol 0
 168 cb 1234 ingress_ifindex 0 ifindex 0" || exit 1
 169         remove_prog out
 170 }
 171
 172 function test_ctx_in {
 173         test_start "test_ctx on lwt in"
 174         install_test in test_ctx
 175         ping -c 3 $IP_LOCAL || {
 176                 failure "test_ctx out: packets are dropped"
 177         }
 178         # We will both request & reply packets as the packets will
 179         # be from $IP_LOCAL => $IP_LOCAL
 180         match_trace "$(get_trace)" "
 181 len 84 hash 0 protocol 8
 182 cb 1234 ingress_ifindex 1 ifindex 1
 183 len 84 hash 0 protocol 8
 184 cb 1234 ingress_ifindex 1 ifindex 1
 185 len 84 hash 0 protocol 8
 186 cb 1234 ingress_ifindex 1 ifindex 1
 187 len 84 hash 0 protocol 8
 188 cb 1234 ingress_ifindex 1 ifindex 1
 189 len 84 hash 0 protocol 8
 190 cb 1234 ingress_ifindex 1 ifindex 1
 191 len 84 hash 0 protocol 8
 192 cb 1234 ingress_ifindex 1 ifindex 1" || exit 1
 193         remove_prog in
 194 }
 195
 196 function test_data {
 197         test_start "test_data on lwt $1"
 198         install_test $1 test_data
 199         ping -c 3 $IPVETH1 || {
 200                 failure "test_data ${1}: packets are dropped"
 201         }
 202         match_trace "$(get_trace)" "
 203 src: 1fea8c0 dst: 2fea8c0
 204 src: 1fea8c0 dst: 2fea8c0
 205 src: 1fea8c0 dst: 2fea8c0" || exit 1
 206         remove_prog $1
 207 }
 208
 209 function test_data_in {
 210         test_start "test_data on lwt in"
 211         install_test in test_data
 212         ping -c 3 $IP_LOCAL || {
 213                 failure "test_data in: packets are dropped"
 214         }
 215         # We will both request & reply packets as the packets will
 216         # be from $IP_LOCAL => $IP_LOCAL
 217         match_trace "$(get_trace)" "
 218 src: 163a8c0 dst: 163a8c0
 219 src: 163a8c0 dst: 163a8c0
 220 src: 163a8c0 dst: 163a8c0
 221 src: 163a8c0 dst: 163a8c0
 222 src: 163a8c0 dst: 163a8c0
 223 src: 163a8c0 dst: 163a8c0" || exit 1
 224         remove_prog in
 225 }
 226
 227 function test_cb {
 228         test_start "test_cb on lwt $1"
 229         install_test $1 test_cb
 230         ping -c 3 $IPVETH1 || {
 231                 failure "test_cb ${1}: packets are dropped"
 232         }
 233         match_trace "$(get_trace)" "
 234 cb0: 0 cb1: 0 cb2: 0
 235 cb3: 0 cb4: 0
 236 cb0: 0 cb1: 0 cb2: 0
 237 cb3: 0 cb4: 0
 238 cb0: 0 cb1: 0 cb2: 0
 239 cb3: 0 cb4: 0" || exit 1
 240         remove_prog $1
 241 }
 242
 243 function test_cb_in {
 244         test_start "test_cb on lwt in"
 245         install_test in test_cb
 246         ping -c 3 $IP_LOCAL || {
 247                 failure "test_cb in: packets are dropped"
 248         }
 249         # We will both request & reply packets as the packets will
 250         # be from $IP_LOCAL => $IP_LOCAL
 251         match_trace "$(get_trace)" "
 252 cb0: 0 cb1: 0 cb2: 0
 253 cb3: 0 cb4: 0
 254 cb0: 0 cb1: 0 cb2: 0
 255 cb3: 0 cb4: 0
 256 cb0: 0 cb1: 0 cb2: 0
 257 cb3: 0 cb4: 0
 258 cb0: 0 cb1: 0 cb2: 0
 259 cb3: 0 cb4: 0
 260 cb0: 0 cb1: 0 cb2: 0
 261 cb3: 0 cb4: 0
 262 cb0: 0 cb1: 0 cb2: 0
 263 cb3: 0 cb4: 0" || exit 1
 264         remove_prog in
 265 }
 266
 267 function test_drop_all {
 268         test_start "test_drop_all on lwt $1"
 269         install_test $1 drop_all
 270         ping -c 3 $IPVETH1 && {
 271                 failure "test_drop_all ${1}: Unexpected success of ping"
 272         }
 273         match_trace "$(get_trace)" "
 274 dropping with: 2
 275 dropping with: 2
 276 dropping with: 2" || exit 1
 277         remove_prog $1
 278 }
 279
 280 function test_drop_all_in {
 281         test_start "test_drop_all on lwt in"
 282         install_test in drop_all
 283         ping -c 3 $IP_LOCAL && {
 284                 failure "test_drop_all in: Unexpected success of ping"
 285         }
 286         match_trace "$(get_trace)" "
 287 dropping with: 2
 288 dropping with: 2
 289 dropping with: 2" || exit 1
 290         remove_prog in
 291 }
 292
 293 function test_push_ll_and_redirect {
 294         test_start "test_push_ll_and_redirect on lwt xmit"
 295         install_test xmit push_ll_and_redirect
 296         ping -c 3 $IPVETH1 || {
 297                 failure "Redirected packets appear to be dropped"
 298         }
 299         match_trace "$(get_trace)" "
 300 redirected to $DST_IFINDEX
 301 redirected to $DST_IFINDEX
 302 redirected to $DST_IFINDEX" || exit 1
 303         remove_prog xmit
 304 }
 305
 306 function test_no_l2_and_redirect {
 307         test_start "test_no_l2_and_redirect on lwt xmit"
 308         install_test xmit fill_garbage_and_redirect
 309         ping -c 3 $IPVETH1 && {
 310                 failure "Unexpected success despite lack of L2 header"
 311         }
 312         match_trace "$(get_trace)" "
 313 redirected to $DST_IFINDEX
 314 redirected to $DST_IFINDEX
 315 redirected to $DST_IFINDEX" || exit 1
 316         remove_prog xmit
 317 }
 318
 319 function test_rewrite {
 320         test_start "test_rewrite on lwt xmit"
 321         install_test xmit test_rewrite
 322         ping -c 3 $IPVETH1 || {
 323                 failure "Rewritten packets appear to be dropped"
 324         }
 325         match_trace "$(get_trace)" "
 326 out: rewriting from 2fea8c0 to 3fea8c0
 327 out: rewriting from 2fea8c0 to 3fea8c0
 328 out: rewriting from 2fea8c0 to 3fea8c0" || exit 1
 329         remove_prog out
 330 }
 331
 332 function test_fill_garbage {
 333         test_start "test_fill_garbage on lwt xmit"
 334         install_test xmit fill_garbage
 335         ping -c 3 $IPVETH1 && {
 336                 failure "test_drop_all ${1}: Unexpected success of ping"
 337         }
 338         match_trace "$(get_trace)" "
 339 Set initial 96 bytes of header to FF
 340 Set initial 96 bytes of header to FF
 341 Set initial 96 bytes of header to FF" || exit 1
 342         remove_prog xmit
 343 }
 344
 345 function test_netperf_nop {
 346         test_start "test_netperf_nop on lwt xmit"
 347         install_test xmit nop
 348         netperf -H $IPVETH1 -t TCP_STREAM || {
 349                 failure "packets appear to be dropped"
 350         }
 351         match_trace "$(get_trace)" ""|| exit 1
 352         remove_prog xmit
 353 }
 354
 355 function test_netperf_redirect {
 356         test_start "test_netperf_redirect on lwt xmit"
 357         install_test xmit push_ll_and_redirect_silent
 358         netperf -H $IPVETH1 -t TCP_STREAM || {
 359                 failure "Rewritten packets appear to be dropped"
 360         }
 361         match_trace "$(get_trace)" ""|| exit 1
 362         remove_prog xmit
 363 }
 364
 365 cleanup
 366 setup_one_veth $NS1 $VETH0 $VETH1 $IPVETH0 $IPVETH1 $IPVETH1b
 367 setup_one_veth $NS2 $VETH2 $VETH3 $IPVETH2 $IPVETH3
 368 ip netns exec $NS1 netserver
 369 echo 1 > ${TRACE_ROOT}/tracing_on
 370
 371 DST_MAC=$(lookup_mac $VETH1 $NS1)
 372 SRC_MAC=$(lookup_mac $VETH0)
 373 DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)
 374
 375 CLANG_OPTS="-O2 -target bpf -I ../include/"
 376 CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
 377 clang $CLANG_OPTS -c test_lwt_bpf.c -o test_lwt_bpf.o
 378
 379 test_ctx_xmit
 380 test_ctx_out
 381 test_ctx_in
 382 test_data "xmit"
 383 test_data "out"
 384 test_data_in
 385 test_cb "xmit"
 386 test_cb "out"
 387 test_cb_in
 388 test_drop_all "xmit"
 389 test_drop_all "out"
 390 test_drop_all_in
 391 test_rewrite
 392 test_push_ll_and_redirect
 393 test_no_l2_and_redirect
 394 test_fill_garbage
 395 test_netperf_nop
 396 test_netperf_redirect
 397
 398 cleanup
 399 echo 0 > ${TRACE_ROOT}/tracing_on
 400 exit 0