#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Load BPF flow dissector and verify it correctly dissects traffic
BPF_FILE="bpf_flow.bpf.o"
export TESTNAME=test_flow_dissector
unmount=0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
msg="skip all tests:"
if [ $UID != 0 ]; then
echo $msg please run this as root >&2
exit $ksft_skip
fi
# This test needs to be run in a network namespace with in_netns.sh. Check if
# this is the case and run it with in_netns.sh if it is being run in the root
# namespace.
if [[ -z $(ip netns identify $$) ]]; then
err=0
if bpftool="$(which bpftool)"; then
echo "Testing global flow dissector..."
$bpftool prog loadall $BPF_FILE /sys/fs/bpf/flow \
type flow_dissector
if ! unshare --net $bpftool prog attach pinned \
/sys/fs/bpf/flow/_dissect flow_dissector; then
echo "Unexpected unsuccessful attach in namespace" >&2
err=1
fi
$bpftool prog attach pinned /sys/fs/bpf/flow/_dissect \
flow_dissector
if unshare --net $bpftool prog attach pinned \
/sys/fs/bpf/flow/_dissect flow_dissector; then
echo "Unexpected successful attach in namespace" >&2
err=1
fi
if ! $bpftool prog detach pinned \
/sys/fs/bpf/flow/_dissect flow_dissector; then
echo "Failed to detach flow dissector" >&2
err=1
fi
rm -rf /sys/fs/bpf/flow
else
echo "Skipping root flow dissector test, bpftool not found" >&2
fi
# Run the rest of the tests in a net namespace.
../net/in_netns.sh "$0" "$@"
err=$(( $err + $? ))
if (( $err == 0 )); then
echo "selftests: $TESTNAME [PASS]";
else
echo "selftests: $TESTNAME [FAILED]";
fi
exit $err
fi
# Determine selftest success via shell exit code
exit_handler()
{
set +e
# Cleanup
tc filter del dev lo ingress pref 1337 2> /dev/null
tc qdisc del dev lo ingress 2> /dev/null
./flow_dissector_load -d 2> /dev/null
if [ $unmount -ne 0 ]; then
umount bpffs 2> /dev/null
fi
}
# Exit script immediately (well catched by trap handler) if any
# program/thing exits with a non-zero status.
set -e
# (Use 'trap -l' to list meaning of numbers)
trap exit_handler 0 2 3 6 9
# Mount BPF file system
if /bin/mount | grep /sys/fs/bpf > /dev/null; then
echo "bpffs already mounted"
else
echo "bpffs not mounted. Mounting..."
unmount=1
/bin/mount bpffs /sys/fs/bpf -t bpf
fi
# Attach BPF program
./flow_dissector_load -p $BPF_FILE -s _dissect
# Setup
tc qdisc add dev lo ingress
echo 0 > /proc/sys/net/ipv4/conf/default/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/lo/rp_filter
echo "Testing IPv4..."
# Drops all IP/UDP packets coming from port 9
tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
udp src_port 9 action drop
# Send 10 IPv4/UDP packets from port 8. Filter should not drop any.
./test_flow_dissector -i 4 -f 8
# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 4 -f 9 -F
# Send 10 IPv4/UDP packets from port 10. Filter should not drop any.
./test_flow_dissector -i 4 -f 10
echo "Testing IPv4 from 127.0.0.127 (fallback to generic dissector)..."
# Send 10 IPv4/UDP packets from port 8. Filter should not drop any.
./test_flow_dissector -i 4 -S 127.0.0.127 -f 8
# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 4 -S 127.0.0.127 -f 9 -F
# Send 10 IPv4/UDP packets from port 10. Filter should not drop any.
./test_flow_dissector -i 4 -S 127.0.0.127 -f 10
echo "Testing IPIP..."
# Send 10 IPv4/IPv4/UDP packets from port 8. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 8
# Send 10 IPv4/IPv4/UDP packets from port 9. Filter should drop all.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
# Send 10 IPv4/IPv4/UDP packets from port 10. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 10
echo "Testing IPv4 + GRE..."
# Send 10 IPv4/GRE/IPv4/UDP packets from port 8. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 8
# Send 10 IPv4/GRE/IPv4/UDP packets from port 9. Filter should drop all.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
# Send 10 IPv4/GRE/IPv4/UDP packets from port 10. Filter should not drop any.
./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
-D 192.168.0.1 -S 1.1.1.1 -f 10
tc filter del dev lo ingress pref 1337
echo "Testing port range..."
# Drops all IP/UDP packets coming from port 8-10
tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
udp src_port 8-10 action drop
# Send 10 IPv4/UDP packets from port 7. Filter should not drop any.
./test_flow_dissector -i 4 -f 7
# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 4 -f 9 -F
# Send 10 IPv4/UDP packets from port 11. Filter should not drop any.
./test_flow_dissector -i 4 -f 11
tc filter del dev lo ingress pref 1337
echo "Testing IPv6..."
# Drops all IPv6/UDP packets coming from port 9
tc filter add dev lo parent ffff: protocol ipv6 pref 1337 flower ip_proto \
udp src_port 9 action drop
# Send 10 IPv6/UDP packets from port 8. Filter should not drop any.
./test_flow_dissector -i 6 -f 8
# Send 10 IPv6/UDP packets from port 9. Filter should drop all.
./test_flow_dissector -i 6 -f 9 -F
# Send 10 IPv6/UDP packets from port 10. Filter should not drop any.
./test_flow_dissector -i 6 -f 10
exit 0
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