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https://github.com/torvalds/linux.git
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f74599f7c5
Adds a series of tests to verify the functionality of attaching
BPF programs at LWT hooks.
Also adds a sample which collects a histogram of packet sizes which
pass through an LWT hook.
$ ./lwt_len_hist.sh
Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.253.2 () port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 39857.69
1 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 22 | |
64 -> 127 : 98 | |
128 -> 255 : 213 | |
256 -> 511 : 1444251 |******** |
512 -> 1023 : 660610 |*** |
1024 -> 2047 : 535241 |** |
2048 -> 4095 : 19 | |
4096 -> 8191 : 180 | |
8192 -> 16383 : 5578023 |************************************* |
16384 -> 32767 : 632099 |*** |
32768 -> 65535 : 6575 | |
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
400 lines
8.9 KiB
Bash
400 lines
8.9 KiB
Bash
#!/bin/bash
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# Uncomment to see generated bytecode
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#VERBOSE=verbose
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NS1=lwt_ns1
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NS2=lwt_ns2
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VETH0=tst_lwt1a
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VETH1=tst_lwt1b
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VETH2=tst_lwt2a
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VETH3=tst_lwt2b
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IPVETH0="192.168.254.1"
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IPVETH1="192.168.254.2"
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IPVETH1b="192.168.254.3"
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IPVETH2="192.168.111.1"
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IPVETH3="192.168.111.2"
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IP_LOCAL="192.168.99.1"
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TRACE_ROOT=/sys/kernel/debug/tracing
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function lookup_mac()
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{
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set +x
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if [ ! -z "$2" ]; then
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MAC=$(ip netns exec $2 ip link show $1 | grep ether | awk '{print $2}')
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else
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MAC=$(ip link show $1 | grep ether | awk '{print $2}')
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fi
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MAC="${MAC//:/}"
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echo "0x${MAC:10:2}${MAC:8:2}${MAC:6:2}${MAC:4:2}${MAC:2:2}${MAC:0:2}"
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set -x
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}
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function cleanup {
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set +ex
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rm test_lwt_bpf.o 2> /dev/null
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ip link del $VETH0 2> /dev/null
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ip link del $VETH1 2> /dev/null
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ip link del $VETH2 2> /dev/null
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ip link del $VETH3 2> /dev/null
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ip netns exec $NS1 killall netserver
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ip netns delete $NS1 2> /dev/null
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ip netns delete $NS2 2> /dev/null
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set -ex
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}
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function setup_one_veth {
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ip netns add $1
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ip link add $2 type veth peer name $3
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ip link set dev $2 up
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ip addr add $4/24 dev $2
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ip link set $3 netns $1
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ip netns exec $1 ip link set dev $3 up
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ip netns exec $1 ip addr add $5/24 dev $3
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if [ "$6" ]; then
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ip netns exec $1 ip addr add $6/32 dev $3
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fi
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}
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function get_trace {
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set +x
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cat ${TRACE_ROOT}/trace | grep -v '^#'
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set -x
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}
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function cleanup_routes {
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ip route del ${IPVETH1}/32 dev $VETH0 2> /dev/null || true
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ip route del table local local ${IP_LOCAL}/32 dev lo 2> /dev/null || true
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}
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function install_test {
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cleanup_routes
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cp /dev/null ${TRACE_ROOT}/trace
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OPTS="encap bpf headroom 14 $1 obj test_lwt_bpf.o section $2 $VERBOSE"
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if [ "$1" == "in" ]; then
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ip route add table local local ${IP_LOCAL}/32 $OPTS dev lo
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else
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ip route add ${IPVETH1}/32 $OPTS dev $VETH0
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fi
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}
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function remove_prog {
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if [ "$1" == "in" ]; then
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ip route del table local local ${IP_LOCAL}/32 dev lo
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else
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ip route del ${IPVETH1}/32 dev $VETH0
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fi
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}
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function filter_trace {
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# Add newline to allow starting EXPECT= variables on newline
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NL=$'\n'
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echo "${NL}$*" | sed -e 's/^.*: : //g'
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}
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function expect_fail {
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set +x
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echo "FAIL:"
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echo "Expected: $1"
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echo "Got: $2"
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set -x
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exit 1
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}
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function match_trace {
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set +x
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RET=0
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TRACE=$1
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EXPECT=$2
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GOT="$(filter_trace "$TRACE")"
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[ "$GOT" != "$EXPECT" ] && {
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expect_fail "$EXPECT" "$GOT"
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RET=1
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}
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set -x
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return $RET
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}
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function test_start {
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set +x
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echo "----------------------------------------------------------------"
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echo "Starting test: $*"
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echo "----------------------------------------------------------------"
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set -x
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}
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function failure {
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get_trace
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echo "FAIL: $*"
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exit 1
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}
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function test_ctx_xmit {
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test_start "test_ctx on lwt xmit"
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install_test xmit test_ctx
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ping -c 3 $IPVETH1 || {
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failure "test_ctx xmit: packets are dropped"
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}
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match_trace "$(get_trace)" "
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX" || exit 1
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remove_prog xmit
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}
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function test_ctx_out {
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test_start "test_ctx on lwt out"
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install_test out test_ctx
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ping -c 3 $IPVETH1 || {
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failure "test_ctx out: packets are dropped"
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}
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match_trace "$(get_trace)" "
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len 84 hash 0 protocol 0
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cb 1234 ingress_ifindex 0 ifindex 0
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len 84 hash 0 protocol 0
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cb 1234 ingress_ifindex 0 ifindex 0
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len 84 hash 0 protocol 0
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cb 1234 ingress_ifindex 0 ifindex 0" || exit 1
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remove_prog out
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}
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function test_ctx_in {
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test_start "test_ctx on lwt in"
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install_test in test_ctx
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ping -c 3 $IP_LOCAL || {
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failure "test_ctx out: packets are dropped"
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}
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# We will both request & reply packets as the packets will
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# be from $IP_LOCAL => $IP_LOCAL
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match_trace "$(get_trace)" "
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1
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len 84 hash 0 protocol 8
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cb 1234 ingress_ifindex 1 ifindex 1" || exit 1
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remove_prog in
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}
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function test_data {
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test_start "test_data on lwt $1"
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install_test $1 test_data
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ping -c 3 $IPVETH1 || {
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failure "test_data ${1}: packets are dropped"
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}
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match_trace "$(get_trace)" "
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src: 1fea8c0 dst: 2fea8c0
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src: 1fea8c0 dst: 2fea8c0
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src: 1fea8c0 dst: 2fea8c0" || exit 1
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remove_prog $1
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}
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function test_data_in {
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test_start "test_data on lwt in"
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install_test in test_data
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ping -c 3 $IP_LOCAL || {
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failure "test_data in: packets are dropped"
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}
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# We will both request & reply packets as the packets will
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# be from $IP_LOCAL => $IP_LOCAL
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match_trace "$(get_trace)" "
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src: 163a8c0 dst: 163a8c0
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src: 163a8c0 dst: 163a8c0
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src: 163a8c0 dst: 163a8c0
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src: 163a8c0 dst: 163a8c0
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src: 163a8c0 dst: 163a8c0
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src: 163a8c0 dst: 163a8c0" || exit 1
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remove_prog in
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}
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function test_cb {
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test_start "test_cb on lwt $1"
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install_test $1 test_cb
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ping -c 3 $IPVETH1 || {
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failure "test_cb ${1}: packets are dropped"
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}
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match_trace "$(get_trace)" "
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0" || exit 1
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remove_prog $1
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}
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function test_cb_in {
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test_start "test_cb on lwt in"
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install_test in test_cb
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ping -c 3 $IP_LOCAL || {
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failure "test_cb in: packets are dropped"
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}
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# We will both request & reply packets as the packets will
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# be from $IP_LOCAL => $IP_LOCAL
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match_trace "$(get_trace)" "
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0
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cb0: 0 cb1: 0 cb2: 0
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cb3: 0 cb4: 0" || exit 1
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remove_prog in
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}
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function test_drop_all {
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test_start "test_drop_all on lwt $1"
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install_test $1 drop_all
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ping -c 3 $IPVETH1 && {
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failure "test_drop_all ${1}: Unexpected success of ping"
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}
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match_trace "$(get_trace)" "
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dropping with: 2
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dropping with: 2
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dropping with: 2" || exit 1
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remove_prog $1
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}
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function test_drop_all_in {
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test_start "test_drop_all on lwt in"
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install_test in drop_all
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ping -c 3 $IP_LOCAL && {
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failure "test_drop_all in: Unexpected success of ping"
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}
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match_trace "$(get_trace)" "
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dropping with: 2
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dropping with: 2
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dropping with: 2" || exit 1
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remove_prog in
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}
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function test_push_ll_and_redirect {
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test_start "test_push_ll_and_redirect on lwt xmit"
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install_test xmit push_ll_and_redirect
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ping -c 3 $IPVETH1 || {
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failure "Redirected packets appear to be dropped"
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}
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match_trace "$(get_trace)" "
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redirected to $DST_IFINDEX
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redirected to $DST_IFINDEX
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redirected to $DST_IFINDEX" || exit 1
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remove_prog xmit
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}
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function test_no_l2_and_redirect {
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test_start "test_no_l2_and_redirect on lwt xmit"
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install_test xmit fill_garbage_and_redirect
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ping -c 3 $IPVETH1 && {
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failure "Unexpected success despite lack of L2 header"
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}
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match_trace "$(get_trace)" "
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redirected to $DST_IFINDEX
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redirected to $DST_IFINDEX
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redirected to $DST_IFINDEX" || exit 1
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remove_prog xmit
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}
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function test_rewrite {
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test_start "test_rewrite on lwt xmit"
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install_test xmit test_rewrite
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ping -c 3 $IPVETH1 || {
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failure "Rewritten packets appear to be dropped"
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}
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match_trace "$(get_trace)" "
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out: rewriting from 2fea8c0 to 3fea8c0
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out: rewriting from 2fea8c0 to 3fea8c0
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out: rewriting from 2fea8c0 to 3fea8c0" || exit 1
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remove_prog out
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}
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function test_fill_garbage {
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test_start "test_fill_garbage on lwt xmit"
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install_test xmit fill_garbage
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ping -c 3 $IPVETH1 && {
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failure "test_drop_all ${1}: Unexpected success of ping"
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}
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match_trace "$(get_trace)" "
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Set initial 96 bytes of header to FF
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Set initial 96 bytes of header to FF
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Set initial 96 bytes of header to FF" || exit 1
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remove_prog xmit
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}
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function test_netperf_nop {
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test_start "test_netperf_nop on lwt xmit"
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install_test xmit nop
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netperf -H $IPVETH1 -t TCP_STREAM || {
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failure "packets appear to be dropped"
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}
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match_trace "$(get_trace)" ""|| exit 1
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remove_prog xmit
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}
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function test_netperf_redirect {
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test_start "test_netperf_redirect on lwt xmit"
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install_test xmit push_ll_and_redirect_silent
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netperf -H $IPVETH1 -t TCP_STREAM || {
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failure "Rewritten packets appear to be dropped"
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}
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match_trace "$(get_trace)" ""|| exit 1
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remove_prog xmit
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}
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cleanup
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setup_one_veth $NS1 $VETH0 $VETH1 $IPVETH0 $IPVETH1 $IPVETH1b
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setup_one_veth $NS2 $VETH2 $VETH3 $IPVETH2 $IPVETH3
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ip netns exec $NS1 netserver
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echo 1 > ${TRACE_ROOT}/tracing_on
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DST_MAC=$(lookup_mac $VETH1 $NS1)
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SRC_MAC=$(lookup_mac $VETH0)
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DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)
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CLANG_OPTS="-O2 -target bpf -I ../include/"
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CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
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clang $CLANG_OPTS -c test_lwt_bpf.c -o test_lwt_bpf.o
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test_ctx_xmit
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test_ctx_out
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test_ctx_in
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test_data "xmit"
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test_data "out"
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test_data_in
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test_cb "xmit"
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test_cb "out"
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test_cb_in
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test_drop_all "xmit"
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test_drop_all "out"
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test_drop_all_in
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test_rewrite
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test_push_ll_and_redirect
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test_no_l2_and_redirect
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test_fill_garbage
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test_netperf_nop
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test_netperf_redirect
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cleanup
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echo 0 > ${TRACE_ROOT}/tracing_on
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exit 0
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