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 PROG_SRC="test_lwt_bpf.c"
  23 BPF_PROG="test_lwt_bpf.o"
  24 TRACE_ROOT=/sys/kernel/tracing
  25 CONTEXT_INFO=$(cat ${TRACE_ROOT}/trace_options | grep context)
  26
  27 function lookup_mac()
  28 {
  29         set +x
  30         if [ ! -z "$2" ]; then
  31                 MAC=$(ip netns exec $2 ip link show $1 | grep ether | awk '{print $2}')
  32         else
  33                 MAC=$(ip link show $1 | grep ether | awk '{print $2}')
  34         fi
  35         MAC="${MAC//:/}"
  36         echo "0x${MAC:10:2}${MAC:8:2}${MAC:6:2}${MAC:4:2}${MAC:2:2}${MAC:0:2}"
  37         set -x
  38 }
  39
  40 function cleanup {
  41         set +ex
  42         rm $BPF_PROG 2> /dev/null
  43         ip link del $VETH0 2> /dev/null
  44         ip link del $VETH1 2> /dev/null
  45         ip link del $VETH2 2> /dev/null
  46         ip link del $VETH3 2> /dev/null
  47         ip netns exec $NS1 killall netserver
  48         ip netns delete $NS1 2> /dev/null
  49         ip netns delete $NS2 2> /dev/null
  50         set -ex
  51 }
  52
  53 function setup_one_veth {
  54         ip netns add $1
  55         ip link add $2 type veth peer name $3
  56         ip link set dev $2 up
  57         ip addr add $4/24 dev $2
  58         ip link set $3 netns $1
  59         ip netns exec $1 ip link set dev $3 up
  60         ip netns exec $1 ip addr add $5/24 dev $3
  61
  62         if [ "$6" ]; then
  63                 ip netns exec $1 ip addr add $6/32 dev $3
  64         fi
  65 }
  66
  67 function get_trace {
  68         set +x
  69         cat ${TRACE_ROOT}/trace | grep -v '^#'
  70         set -x
  71 }
  72
  73 function cleanup_routes {
  74         ip route del ${IPVETH1}/32 dev $VETH0 2> /dev/null || true
  75         ip route del table local local ${IP_LOCAL}/32 dev lo 2> /dev/null || true
  76 }
  77
  78 function install_test {
  79         cleanup_routes
  80         cp /dev/null ${TRACE_ROOT}/trace
  81
  82         OPTS="encap bpf headroom 14 $1 obj $BPF_PROG section $2 $VERBOSE"
  83
  84         if [ "$1" == "in" ];  then
  85                 ip route add table local local ${IP_LOCAL}/32 $OPTS dev lo
  86         else
  87                 ip route add ${IPVETH1}/32 $OPTS dev $VETH0
  88         fi
  89 }
  90
  91 function remove_prog {
  92         if [ "$1" == "in" ];  then
  93                 ip route del table local local ${IP_LOCAL}/32 dev lo
  94         else
  95                 ip route del ${IPVETH1}/32 dev $VETH0
  96         fi
  97 }
  98
  99 function filter_trace {
 100         # Add newline to allow starting EXPECT= variables on newline
 101         NL=$'\n'
 102         echo "${NL}$*" | sed -e 's/bpf_trace_printk: //g'
 103 }
 104
 105 function expect_fail {
 106         set +x
 107         echo "FAIL:"
 108         echo "Expected: $1"
 109         echo "Got: $2"
 110         set -x
 111         exit 1
 112 }
 113
 114 function match_trace {
 115         set +x
 116         RET=0
 117         TRACE=$1
 118         EXPECT=$2
 119         GOT="$(filter_trace "$TRACE")"
 120
 121         [ "$GOT" != "$EXPECT" ] && {
 122                 expect_fail "$EXPECT" "$GOT"
 123                 RET=1
 124         }
 125         set -x
 126         return $RET
 127 }
 128
 129 function test_start {
 130         set +x
 131         echo "----------------------------------------------------------------"
 132         echo "Starting test: $*"
 133         echo "----------------------------------------------------------------"
 134         set -x
 135 }
 136
 137 function failure {
 138         get_trace
 139         echo "FAIL: $*"
 140         exit 1
 141 }
 142
 143 function test_ctx_xmit {
 144         test_start "test_ctx on lwt xmit"
 145         install_test xmit test_ctx
 146         ping -c 3 $IPVETH1 || {
 147                 failure "test_ctx xmit: packets are dropped"
 148         }
 149         match_trace "$(get_trace)" "
 150 len 84 hash 0 protocol 8
 151 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
 152 len 84 hash 0 protocol 8
 153 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
 154 len 84 hash 0 protocol 8
 155 cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX" || exit 1
 156         remove_prog xmit
 157 }
 158
 159 function test_ctx_out {
 160         test_start "test_ctx on lwt out"
 161         install_test out test_ctx
 162         ping -c 3 $IPVETH1 || {
 163                 failure "test_ctx out: packets are dropped"
 164         }
 165         match_trace "$(get_trace)" "
 166 len 84 hash 0 protocol 8
 167 cb 1234 ingress_ifindex 0 ifindex 0
 168 len 84 hash 0 protocol 8
 169 cb 1234 ingress_ifindex 0 ifindex 0
 170 len 84 hash 0 protocol 8
 171 cb 1234 ingress_ifindex 0 ifindex 0" || exit 1
 172         remove_prog out
 173 }
 174
 175 function test_ctx_in {
 176         test_start "test_ctx on lwt in"
 177         install_test in test_ctx
 178         ping -c 3 $IP_LOCAL || {
 179                 failure "test_ctx out: packets are dropped"
 180         }
 181         # We will both request & reply packets as the packets will
 182         # be from $IP_LOCAL => $IP_LOCAL
 183         match_trace "$(get_trace)" "
 184 len 84 hash 0 protocol 8
 185 cb 1234 ingress_ifindex 1 ifindex 1
 186 len 84 hash 0 protocol 8
 187 cb 1234 ingress_ifindex 1 ifindex 1
 188 len 84 hash 0 protocol 8
 189 cb 1234 ingress_ifindex 1 ifindex 1
 190 len 84 hash 0 protocol 8
 191 cb 1234 ingress_ifindex 1 ifindex 1
 192 len 84 hash 0 protocol 8
 193 cb 1234 ingress_ifindex 1 ifindex 1
 194 len 84 hash 0 protocol 8
 195 cb 1234 ingress_ifindex 1 ifindex 1" || exit 1
 196         remove_prog in
 197 }
 198
 199 function test_data {
 200         test_start "test_data on lwt $1"
 201         install_test $1 test_data
 202         ping -c 3 $IPVETH1 || {
 203                 failure "test_data ${1}: packets are dropped"
 204         }
 205         match_trace "$(get_trace)" "
 206 src: 1fea8c0 dst: 2fea8c0
 207 src: 1fea8c0 dst: 2fea8c0
 208 src: 1fea8c0 dst: 2fea8c0" || exit 1
 209         remove_prog $1
 210 }
 211
 212 function test_data_in {
 213         test_start "test_data on lwt in"
 214         install_test in test_data
 215         ping -c 3 $IP_LOCAL || {
 216                 failure "test_data in: packets are dropped"
 217         }
 218         # We will both request & reply packets as the packets will
 219         # be from $IP_LOCAL => $IP_LOCAL
 220         match_trace "$(get_trace)" "
 221 src: 163a8c0 dst: 163a8c0
 222 src: 163a8c0 dst: 163a8c0
 223 src: 163a8c0 dst: 163a8c0
 224 src: 163a8c0 dst: 163a8c0
 225 src: 163a8c0 dst: 163a8c0
 226 src: 163a8c0 dst: 163a8c0" || exit 1
 227         remove_prog in
 228 }
 229
 230 function test_cb {
 231         test_start "test_cb on lwt $1"
 232         install_test $1 test_cb
 233         ping -c 3 $IPVETH1 || {
 234                 failure "test_cb ${1}: packets are dropped"
 235         }
 236         match_trace "$(get_trace)" "
 237 cb0: 0 cb1: 0 cb2: 0
 238 cb3: 0 cb4: 0
 239 cb0: 0 cb1: 0 cb2: 0
 240 cb3: 0 cb4: 0
 241 cb0: 0 cb1: 0 cb2: 0
 242 cb3: 0 cb4: 0" || exit 1
 243         remove_prog $1
 244 }
 245
 246 function test_cb_in {
 247         test_start "test_cb on lwt in"
 248         install_test in test_cb
 249         ping -c 3 $IP_LOCAL || {
 250                 failure "test_cb in: packets are dropped"
 251         }
 252         # We will both request & reply packets as the packets will
 253         # be from $IP_LOCAL => $IP_LOCAL
 254         match_trace "$(get_trace)" "
 255 cb0: 0 cb1: 0 cb2: 0
 256 cb3: 0 cb4: 0
 257 cb0: 0 cb1: 0 cb2: 0
 258 cb3: 0 cb4: 0
 259 cb0: 0 cb1: 0 cb2: 0
 260 cb3: 0 cb4: 0
 261 cb0: 0 cb1: 0 cb2: 0
 262 cb3: 0 cb4: 0
 263 cb0: 0 cb1: 0 cb2: 0
 264 cb3: 0 cb4: 0
 265 cb0: 0 cb1: 0 cb2: 0
 266 cb3: 0 cb4: 0" || exit 1
 267         remove_prog in
 268 }
 269
 270 function test_drop_all {
 271         test_start "test_drop_all on lwt $1"
 272         install_test $1 drop_all
 273         ping -c 3 $IPVETH1 && {
 274                 failure "test_drop_all ${1}: Unexpected success of ping"
 275         }
 276         match_trace "$(get_trace)" "
 277 dropping with: 2
 278 dropping with: 2
 279 dropping with: 2" || exit 1
 280         remove_prog $1
 281 }
 282
 283 function test_drop_all_in {
 284         test_start "test_drop_all on lwt in"
 285         install_test in drop_all
 286         ping -c 3 $IP_LOCAL && {
 287                 failure "test_drop_all in: Unexpected success of ping"
 288         }
 289         match_trace "$(get_trace)" "
 290 dropping with: 2
 291 dropping with: 2
 292 dropping with: 2" || exit 1
 293         remove_prog in
 294 }
 295
 296 function test_push_ll_and_redirect {
 297         test_start "test_push_ll_and_redirect on lwt xmit"
 298         install_test xmit push_ll_and_redirect
 299         ping -c 3 $IPVETH1 || {
 300                 failure "Redirected packets appear to be dropped"
 301         }
 302         match_trace "$(get_trace)" "
 303 redirected to $DST_IFINDEX
 304 redirected to $DST_IFINDEX
 305 redirected to $DST_IFINDEX" || exit 1
 306         remove_prog xmit
 307 }
 308
 309 function test_no_l2_and_redirect {
 310         test_start "test_no_l2_and_redirect on lwt xmit"
 311         install_test xmit fill_garbage_and_redirect
 312         ping -c 3 $IPVETH1 && {
 313                 failure "Unexpected success despite lack of L2 header"
 314         }
 315         match_trace "$(get_trace)" "
 316 redirected to $DST_IFINDEX
 317 redirected to $DST_IFINDEX
 318 redirected to $DST_IFINDEX" || exit 1
 319         remove_prog xmit
 320 }
 321
 322 function test_rewrite {
 323         test_start "test_rewrite on lwt xmit"
 324         install_test xmit test_rewrite
 325         ping -c 3 $IPVETH1 || {
 326                 failure "Rewritten packets appear to be dropped"
 327         }
 328         match_trace "$(get_trace)" "
 329 out: rewriting from 2fea8c0 to 3fea8c0
 330 out: rewriting from 2fea8c0 to 3fea8c0
 331 out: rewriting from 2fea8c0 to 3fea8c0" || exit 1
 332         remove_prog out
 333 }
 334
 335 function test_fill_garbage {
 336         test_start "test_fill_garbage on lwt xmit"
 337         install_test xmit fill_garbage
 338         ping -c 3 $IPVETH1 && {
 339                 failure "test_drop_all ${1}: Unexpected success of ping"
 340         }
 341         match_trace "$(get_trace)" "
 342 Set initial 96 bytes of header to FF
 343 Set initial 96 bytes of header to FF
 344 Set initial 96 bytes of header to FF" || exit 1
 345         remove_prog xmit
 346 }
 347
 348 function test_netperf_nop {
 349         test_start "test_netperf_nop on lwt xmit"
 350         install_test xmit nop
 351         netperf -H $IPVETH1 -t TCP_STREAM || {
 352                 failure "packets appear to be dropped"
 353         }
 354         match_trace "$(get_trace)" ""|| exit 1
 355         remove_prog xmit
 356 }
 357
 358 function test_netperf_redirect {
 359         test_start "test_netperf_redirect on lwt xmit"
 360         install_test xmit push_ll_and_redirect_silent
 361         netperf -H $IPVETH1 -t TCP_STREAM || {
 362                 failure "Rewritten packets appear to be dropped"
 363         }
 364         match_trace "$(get_trace)" ""|| exit 1
 365         remove_prog xmit
 366 }
 367
 368 cleanup
 369 setup_one_veth $NS1 $VETH0 $VETH1 $IPVETH0 $IPVETH1 $IPVETH1b
 370 setup_one_veth $NS2 $VETH2 $VETH3 $IPVETH2 $IPVETH3
 371 ip netns exec $NS1 netserver
 372 echo 1 > ${TRACE_ROOT}/tracing_on
 373 echo nocontext-info > ${TRACE_ROOT}/trace_options
 374
 375 DST_MAC=$(lookup_mac $VETH1 $NS1)
 376 SRC_MAC=$(lookup_mac $VETH0)
 377 DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)
 378
 379 CLANG_OPTS="-O2 --target=bpf -I ../include/"
 380 CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
 381 clang $CLANG_OPTS -c $PROG_SRC -o $BPF_PROG
 382
 383 test_ctx_xmit
 384 test_ctx_out
 385 test_ctx_in
 386 test_data "xmit"
 387 test_data "out"
 388 test_data_in
 389 test_cb "xmit"
 390 test_cb "out"
 391 test_cb_in
 392 test_drop_all "xmit"
 393 test_drop_all "out"
 394 test_drop_all_in
 395 test_rewrite
 396 test_push_ll_and_redirect
 397 test_no_l2_and_redirect
 398 test_fill_garbage
 399 test_netperf_nop
 400 test_netperf_redirect
 401
 402 cleanup
 403 echo 0 > ${TRACE_ROOT}/tracing_on
 404 echo $CONTEXT_INFO > ${TRACE_ROOT}/trace_options
 405 exit 0