1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3
4[[ -z $TC ]] && TC='tc'
5[[ -z $IP ]] && IP='ip'
6
7REDIRECT_USER='./tc_l2_redirect'
8REDIRECT_BPF='./tc_l2_redirect_kern.o'
9
10RP_FILTER=$(< /proc/sys/net/ipv4/conf/all/rp_filter)
11IPV6_DISABLED=$(< /proc/sys/net/ipv6/conf/all/disable_ipv6)
12IPV6_FORWARDING=$(< /proc/sys/net/ipv6/conf/all/forwarding)
13
14function config_common {
15	local tun_type=$1
16
17	$IP netns add ns1
18	$IP netns add ns2
19	$IP link add ve1 type veth peer name vens1
20	$IP link add ve2 type veth peer name vens2
21	$IP link set dev ve1 up
22	$IP link set dev ve2 up
23	$IP link set dev ve1 mtu 1500
24	$IP link set dev ve2 mtu 1500
25	$IP link set dev vens1 netns ns1
26	$IP link set dev vens2 netns ns2
27
28	$IP -n ns1 link set dev lo up
29	$IP -n ns1 link set dev vens1 up
30	$IP -n ns1 addr add 10.1.1.101/24 dev vens1
31	$IP -n ns1 addr add 2401:db01::65/64 dev vens1 nodad
32	$IP -n ns1 route add default via 10.1.1.1 dev vens1
33	$IP -n ns1 route add default via 2401:db01::1 dev vens1
34
35	$IP -n ns2 link set dev lo up
36	$IP -n ns2 link set dev vens2 up
37	$IP -n ns2 addr add 10.2.1.102/24 dev vens2
38	$IP -n ns2 addr add 2401:db02::66/64 dev vens2 nodad
39	$IP -n ns2 addr add 10.10.1.102 dev lo
40	$IP -n ns2 addr add 2401:face::66/64 dev lo nodad
41	$IP -n ns2 link add ipt2 type ipip local 10.2.1.102 remote 10.2.1.1
42	$IP -n ns2 link add ip6t2 type ip6tnl mode any local 2401:db02::66 remote 2401:db02::1
43	$IP -n ns2 link set dev ipt2 up
44	$IP -n ns2 link set dev ip6t2 up
45	$IP netns exec ns2 $TC qdisc add dev vens2 clsact
46	$IP netns exec ns2 $TC filter add dev vens2 ingress bpf da obj $REDIRECT_BPF sec drop_non_tun_vip
47	if [[ $tun_type == "ipip" ]]; then
48		$IP -n ns2 route add 10.1.1.0/24 dev ipt2
49		$IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0
50		$IP netns exec ns2 sysctl -q -w net.ipv4.conf.ipt2.rp_filter=0
51	else
52		$IP -n ns2 route add 10.1.1.0/24 dev ip6t2
53		$IP -n ns2 route add 2401:db01::/64 dev ip6t2
54		$IP netns exec ns2 sysctl -q -w net.ipv4.conf.all.rp_filter=0
55		$IP netns exec ns2 sysctl -q -w net.ipv4.conf.ip6t2.rp_filter=0
56	fi
57
58	$IP addr add 10.1.1.1/24 dev ve1
59	$IP addr add 2401:db01::1/64 dev ve1 nodad
60	$IP addr add 10.2.1.1/24 dev ve2
61	$IP addr add 2401:db02::1/64 dev ve2 nodad
62
63	$TC qdisc add dev ve2 clsact
64	$TC filter add dev ve2 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_forward
65
66	sysctl -q -w net.ipv4.conf.all.rp_filter=0
67	sysctl -q -w net.ipv6.conf.all.forwarding=1
68	sysctl -q -w net.ipv6.conf.all.disable_ipv6=0
69}
70
71function cleanup {
72	set +e
73	[[ -z $DEBUG ]] || set +x
74	$IP netns delete ns1 >& /dev/null
75	$IP netns delete ns2 >& /dev/null
76	$IP link del ve1 >& /dev/null
77	$IP link del ve2 >& /dev/null
78	$IP link del ipt >& /dev/null
79	$IP link del ip6t >& /dev/null
80	sysctl -q -w net.ipv4.conf.all.rp_filter=$RP_FILTER
81	sysctl -q -w net.ipv6.conf.all.forwarding=$IPV6_FORWARDING
82	sysctl -q -w net.ipv6.conf.all.disable_ipv6=$IPV6_DISABLED
83	rm -f /sys/fs/bpf/tc/globals/tun_iface
84	[[ -z $DEBUG ]] || set -x
85	set -e
86}
87
88function l2_to_ipip {
89	echo -n "l2_to_ipip $1: "
90
91	local dir=$1
92
93	config_common ipip
94
95	$IP link add ipt type ipip external
96	$IP link set dev ipt up
97	sysctl -q -w net.ipv4.conf.ipt.rp_filter=0
98	sysctl -q -w net.ipv4.conf.ipt.forwarding=1
99
100	if [[ $dir == "egress" ]]; then
101		$IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2
102		$TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect
103		sysctl -q -w net.ipv4.conf.ve1.forwarding=1
104	else
105		$TC qdisc add dev ve1 clsact
106		$TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_iptun_ingress_redirect
107	fi
108
109	$REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ipt/ifindex)
110
111	$IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null
112
113	if [[ $dir == "egress" ]]; then
114		# test direct egress to ve2 (i.e. not forwarding from
115		# ve1 to ve2).
116		ping -c1 10.10.1.102 >& /dev/null
117	fi
118
119	cleanup
120
121	echo "OK"
122}
123
124function l2_to_ip6tnl {
125	echo -n "l2_to_ip6tnl $1: "
126
127	local dir=$1
128
129	config_common ip6tnl
130
131	$IP link add ip6t type ip6tnl mode any external
132	$IP link set dev ip6t up
133	sysctl -q -w net.ipv4.conf.ip6t.rp_filter=0
134	sysctl -q -w net.ipv4.conf.ip6t.forwarding=1
135
136	if [[ $dir == "egress" ]]; then
137		$IP route add 10.10.1.0/24 via 10.2.1.102 dev ve2
138		$IP route add 2401:face::/64 via 2401:db02::66 dev ve2
139		$TC filter add dev ve2 egress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect
140		sysctl -q -w net.ipv4.conf.ve1.forwarding=1
141	else
142		$TC qdisc add dev ve1 clsact
143		$TC filter add dev ve1 ingress bpf da obj $REDIRECT_BPF sec l2_to_ip6tun_ingress_redirect
144	fi
145
146	$REDIRECT_USER -U /sys/fs/bpf/tc/globals/tun_iface -i $(< /sys/class/net/ip6t/ifindex)
147
148	$IP netns exec ns1 ping -c1 10.10.1.102 >& /dev/null
149	$IP netns exec ns1 ping -6 -c1 2401:face::66 >& /dev/null
150
151	if [[ $dir == "egress" ]]; then
152		# test direct egress to ve2 (i.e. not forwarding from
153		# ve1 to ve2).
154		ping -c1 10.10.1.102 >& /dev/null
155		ping -6 -c1 2401:face::66 >& /dev/null
156	fi
157
158	cleanup
159
160	echo "OK"
161}
162
163cleanup
164test_names="l2_to_ipip l2_to_ip6tnl"
165test_dirs="ingress egress"
166if [[ $# -ge 2 ]]; then
167	test_names=$1
168	test_dirs=$2
169elif [[ $# -ge 1 ]]; then
170	test_names=$1
171fi
172
173for t in $test_names; do
174	for d in $test_dirs; do
175		$t $d
176	done
177done
178