1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# Load BPF flow dissector and verify it correctly dissects traffic
5export TESTNAME=test_flow_dissector
6unmount=0
7
8# Kselftest framework requirement - SKIP code is 4.
9ksft_skip=4
10
11msg="skip all tests:"
12if [ $UID != 0 ]; then
13	echo $msg please run this as root >&2
14	exit $ksft_skip
15fi
16
17# This test needs to be run in a network namespace with in_netns.sh. Check if
18# this is the case and run it with in_netns.sh if it is being run in the root
19# namespace.
20if [[ -z $(ip netns identify $$) ]]; then
21	err=0
22	if bpftool="$(which bpftool)"; then
23		echo "Testing global flow dissector..."
24
25		$bpftool prog loadall ./bpf_flow.o /sys/fs/bpf/flow \
26			type flow_dissector
27
28		if ! unshare --net $bpftool prog attach pinned \
29			/sys/fs/bpf/flow/_dissect flow_dissector; then
30			echo "Unexpected unsuccessful attach in namespace" >&2
31			err=1
32		fi
33
34		$bpftool prog attach pinned /sys/fs/bpf/flow/_dissect \
35			flow_dissector
36
37		if unshare --net $bpftool prog attach pinned \
38			/sys/fs/bpf/flow/_dissect flow_dissector; then
39			echo "Unexpected successful attach in namespace" >&2
40			err=1
41		fi
42
43		if ! $bpftool prog detach pinned \
44			/sys/fs/bpf/flow/_dissect flow_dissector; then
45			echo "Failed to detach flow dissector" >&2
46			err=1
47		fi
48
49		rm -rf /sys/fs/bpf/flow
50	else
51		echo "Skipping root flow dissector test, bpftool not found" >&2
52	fi
53
54	# Run the rest of the tests in a net namespace.
55	../net/in_netns.sh "$0" "$@"
56	err=$(( $err + $? ))
57
58	if (( $err == 0 )); then
59		echo "selftests: $TESTNAME [PASS]";
60	else
61		echo "selftests: $TESTNAME [FAILED]";
62	fi
63
64	exit $err
65fi
66
67# Determine selftest success via shell exit code
68exit_handler()
69{
70	set +e
71
72	# Cleanup
73	tc filter del dev lo ingress pref 1337 2> /dev/null
74	tc qdisc del dev lo ingress 2> /dev/null
75	./flow_dissector_load -d 2> /dev/null
76	if [ $unmount -ne 0 ]; then
77		umount bpffs 2> /dev/null
78	fi
79}
80
81# Exit script immediately (well catched by trap handler) if any
82# program/thing exits with a non-zero status.
83set -e
84
85# (Use 'trap -l' to list meaning of numbers)
86trap exit_handler 0 2 3 6 9
87
88# Mount BPF file system
89if /bin/mount | grep /sys/fs/bpf > /dev/null; then
90	echo "bpffs already mounted"
91else
92	echo "bpffs not mounted. Mounting..."
93	unmount=1
94	/bin/mount bpffs /sys/fs/bpf -t bpf
95fi
96
97# Attach BPF program
98./flow_dissector_load -p bpf_flow.o -s _dissect
99
100# Setup
101tc qdisc add dev lo ingress
102echo 0 > /proc/sys/net/ipv4/conf/default/rp_filter
103echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
104echo 0 > /proc/sys/net/ipv4/conf/lo/rp_filter
105
106echo "Testing IPv4..."
107# Drops all IP/UDP packets coming from port 9
108tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
109	udp src_port 9 action drop
110
111# Send 10 IPv4/UDP packets from port 8. Filter should not drop any.
112./test_flow_dissector -i 4 -f 8
113# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
114./test_flow_dissector -i 4 -f 9 -F
115# Send 10 IPv4/UDP packets from port 10. Filter should not drop any.
116./test_flow_dissector -i 4 -f 10
117
118echo "Testing IPIP..."
119# Send 10 IPv4/IPv4/UDP packets from port 8. Filter should not drop any.
120./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
121	-D 192.168.0.1 -S 1.1.1.1 -f 8
122# Send 10 IPv4/IPv4/UDP packets from port 9. Filter should drop all.
123./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
124	-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
125# Send 10 IPv4/IPv4/UDP packets from port 10. Filter should not drop any.
126./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e bare -i 4 \
127	-D 192.168.0.1 -S 1.1.1.1 -f 10
128
129echo "Testing IPv4 + GRE..."
130# Send 10 IPv4/GRE/IPv4/UDP packets from port 8. Filter should not drop any.
131./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
132	-D 192.168.0.1 -S 1.1.1.1 -f 8
133# Send 10 IPv4/GRE/IPv4/UDP packets from port 9. Filter should drop all.
134./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
135	-D 192.168.0.1 -S 1.1.1.1 -f 9 -F
136# Send 10 IPv4/GRE/IPv4/UDP packets from port 10. Filter should not drop any.
137./with_addr.sh ./with_tunnels.sh ./test_flow_dissector -o 4 -e gre -i 4 \
138	-D 192.168.0.1 -S 1.1.1.1 -f 10
139
140tc filter del dev lo ingress pref 1337
141
142echo "Testing port range..."
143# Drops all IP/UDP packets coming from port 8-10
144tc filter add dev lo parent ffff: protocol ip pref 1337 flower ip_proto \
145	udp src_port 8-10 action drop
146
147# Send 10 IPv4/UDP packets from port 7. Filter should not drop any.
148./test_flow_dissector -i 4 -f 7
149# Send 10 IPv4/UDP packets from port 9. Filter should drop all.
150./test_flow_dissector -i 4 -f 9 -F
151# Send 10 IPv4/UDP packets from port 11. Filter should not drop any.
152./test_flow_dissector -i 4 -f 11
153
154tc filter del dev lo ingress pref 1337
155
156echo "Testing IPv6..."
157# Drops all IPv6/UDP packets coming from port 9
158tc filter add dev lo parent ffff: protocol ipv6 pref 1337 flower ip_proto \
159	udp src_port 9 action drop
160
161# Send 10 IPv6/UDP packets from port 8. Filter should not drop any.
162./test_flow_dissector -i 6 -f 8
163# Send 10 IPv6/UDP packets from port 9. Filter should drop all.
164./test_flow_dissector -i 6 -f 9 -F
165# Send 10 IPv6/UDP packets from port 10. Filter should not drop any.
166./test_flow_dissector -i 6 -f 10
167
168exit 0
169