1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Test a "one-armed router" [1] scenario. Packets forwarded between H1 and H2
5 # should be forwarded by the ASIC, but also trapped so that ICMP redirect
6 # packets could be potentially generated.
7 #
8 # 1. https://en.wikipedia.org/wiki/One-armed_router
9 #
10 # +---------------------------------+
11 # | H1 (vrf) |
12 # | + $h1 |
13 # | | 192.0.2.1/24 |
14 # | | 2001:db8:1::1/64 |
15 # | | |
16 # | | default via 192.0.2.2 |
17 # | | default via 2001:db8:1::2 |
18 # +----|----------------------------+
19 # |
20 # +----|----------------------------------------------------------------------+
21 # | SW | |
22 # | +--|--------------------------------------------------------------------+ |
23 # | | + $swp1 BR0 (802.1d) | |
24 # | | | |
25 # | | 192.0.2.2/24 | |
26 # | | 2001:db8:1::2/64 | |
27 # | | 198.51.100.2/24 | |
28 # | | 2001:db8:2::2/64 | |
29 # | | | |
30 # | | + $swp2 | |
31 # | +--|--------------------------------------------------------------------+ |
32 # | | |
33 # +----|----------------------------------------------------------------------+
34 # |
35 # +----|----------------------------+
36 # | | default via 198.51.100.2 |
37 # | | default via 2001:db8:2::2 |
38 # | | |
39 # | | 2001:db8:2::1/64 |
40 # | | 198.51.100.1/24 |
41 # | + $h2 |
42 # | H2 (vrf) |
43 # +---------------------------------+
44
45 lib_dir=$(dirname $0)/../../../net/forwarding
46
47 ALL_TESTS="ping_ipv4 ping_ipv6 fwd_mark_ipv4 fwd_mark_ipv6"
48 NUM_NETIFS=4
49 source $lib_dir/tc_common.sh
50 source $lib_dir/lib.sh
51
52 h1_create()
53 {
54 simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
55
56 ip -4 route add default vrf v$h1 nexthop via 192.0.2.2
57 ip -6 route add default vrf v$h1 nexthop via 2001:db8:1::2
58 }
59
60 h1_destroy()
61 {
62 ip -6 route del default vrf v$h1 nexthop via 2001:db8:1::2
63 ip -4 route del default vrf v$h1 nexthop via 192.0.2.2
64
65 simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
66 }
67
68 h2_create()
69 {
70 simple_if_init $h2 198.51.100.1/24 2001:db8:2::1/64
71
72 ip -4 route add default vrf v$h2 nexthop via 198.51.100.2
73 ip -6 route add default vrf v$h2 nexthop via 2001:db8:2::2
74 }
75
76 h2_destroy()
77 {
78 ip -6 route del default vrf v$h2 nexthop via 2001:db8:2::2
79 ip -4 route del default vrf v$h2 nexthop via 198.51.100.2
80
81 simple_if_fini $h2 198.51.100.1/24 2001:db8:2::1/64
82 }
83
84 switch_create()
85 {
86 ip link add name br0 address $(mac_get $swp1) \
87 type bridge mcast_snooping 0
88 ip link set dev br0 up
89
90 ip link set dev $swp1 master br0
91 ip link set dev $swp1 up
92 ip link set dev $swp2 master br0
93 ip link set dev $swp2 up
94
95 tc qdisc add dev $swp1 clsact
96 tc qdisc add dev $swp2 clsact
97
98 __addr_add_del br0 add 192.0.2.2/24 2001:db8:1::2/64
99 __addr_add_del br0 add 198.51.100.2/24 2001:db8:2::2/64
100 }
101
102 switch_destroy()
103 {
104 __addr_add_del br0 del 198.51.100.2/24 2001:db8:2::2/64
105 __addr_add_del br0 del 192.0.2.2/24 2001:db8:1::2/64
106
107 tc qdisc del dev $swp2 clsact
108 tc qdisc del dev $swp1 clsact
109
110 ip link set dev $swp2 down
111 ip link set dev $swp2 nomaster
112 ip link set dev $swp1 down
113 ip link set dev $swp1 nomaster
114
115 ip link set dev br0 down
116 ip link del dev br0
117 }
118
119 ping_ipv4()
120 {
121 ping_test $h1 198.51.100.1 ": h1->h2"
122 }
123
124 ping_ipv6()
125 {
126 ping6_test $h1 2001:db8:2::1 ": h1->h2"
127 }
128
129 fwd_mark_ipv4()
130 {
131 # Transmit packets from H1 to H2 and make sure they are trapped at
132 # swp1 due to loopback error, but only forwarded by the ASIC through
133 # swp2
134
135 tc filter add dev $swp1 ingress protocol ip pref 1 handle 101 flower \
136 skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
137 action pass
138
139 tc filter add dev $swp2 egress protocol ip pref 1 handle 101 flower \
140 skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
141 action pass
142
143 tc filter add dev $swp2 egress protocol ip pref 2 handle 102 flower \
144 skip_sw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \
145 action pass
146
147 ip vrf exec v$h1 $MZ $h1 -c 10 -d 100msec -p 64 -A 192.0.2.1 \
148 -B 198.51.100.1 -t udp dp=52768,sp=42768 -q
149
150 RET=0
151
152 tc_check_packets "dev $swp1 ingress" 101 10
153 check_err $?
154
155 log_test "fwd mark: trapping IPv4 packets due to LBERROR"
156
157 RET=0
158
159 tc_check_packets "dev $swp2 egress" 101 0
160 check_err $?
161
162 log_test "fwd mark: forwarding IPv4 packets in software"
163
164 RET=0
165
166 tc_check_packets "dev $swp2 egress" 102 10
167 check_err $?
168
169 log_test "fwd mark: forwarding IPv4 packets in hardware"
170
171 tc filter del dev $swp2 egress protocol ip pref 2 handle 102 flower
172 tc filter del dev $swp2 egress protocol ip pref 1 handle 101 flower
173 tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower
174 }
175
176 fwd_mark_ipv6()
177 {
178 tc filter add dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower \
179 skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
180 action pass
181
182 tc filter add dev $swp2 egress protocol ipv6 pref 1 handle 101 flower \
183 skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
184 action pass
185
186 tc filter add dev $swp2 egress protocol ipv6 pref 2 handle 102 flower \
187 skip_sw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \
188 action pass
189
190 ip vrf exec v$h1 $MZ $h1 -6 -c 10 -d 100msec -p 64 -A 2001:db8:1::1 \
191 -B 2001:db8:2::1 -t udp dp=52768,sp=42768 -q
192
193 RET=0
194
195 tc_check_packets "dev $swp1 ingress" 101 10
196 check_err $?
197
198 log_test "fwd mark: trapping IPv6 packets due to LBERROR"
199
200 RET=0
201
202 tc_check_packets "dev $swp2 egress" 101 0
203 check_err $?
204
205 log_test "fwd mark: forwarding IPv6 packets in software"
206
207 RET=0
208
209 tc_check_packets "dev $swp2 egress" 102 10
210 check_err $?
211
212 log_test "fwd mark: forwarding IPv6 packets in hardware"
213
214 tc filter del dev $swp2 egress protocol ipv6 pref 2 handle 102 flower
215 tc filter del dev $swp2 egress protocol ipv6 pref 1 handle 101 flower
216 tc filter del dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower
217 }
218
219 setup_prepare()
220 {
221 h1=${NETIFS[p1]}
222 swp1=${NETIFS[p2]}
223
224 swp2=${NETIFS[p3]}
225 h2=${NETIFS[p4]}
226
227 vrf_prepare
228 forwarding_enable
229
230 sysctl_set net.ipv4.conf.all.accept_redirects 0
231 sysctl_set net.ipv6.conf.all.accept_redirects 0
232
233 h1_create
234 h2_create
235 switch_create
236 }
237
238 cleanup()
239 {
240 pre_cleanup
241
242 switch_destroy
243 h2_destroy
244 h1_destroy
245
246 sysctl_restore net.ipv6.conf.all.accept_redirects
247 sysctl_restore net.ipv4.conf.all.accept_redirects
248
249 forwarding_restore
250 vrf_cleanup
251 }
252
253 trap cleanup EXIT
254
255 setup_prepare
256 setup_wait
257
258 tests_run
259
260 exit $EXIT_STATUS
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