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