one_armed_router.sh (6950B)
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# | + $h2 | 42# | H2 (vrf) | 43# +---------------------------------+ 44 45lib_dir=$(dirname $0)/../../../net/forwarding 46 47ALL_TESTS="ping_ipv4 ping_ipv6 fwd_mark_ipv4 fwd_mark_ipv6" 48NUM_NETIFS=4 49source $lib_dir/tc_common.sh 50source $lib_dir/lib.sh 51 52h1_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$h1 nexthop via 2001:db8:1::2 58} 59 60h1_destroy() 61{ 62 ip -6 route del default vrf v$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 68h2_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$h2 nexthop via 2001:db8:2::2 74} 75 76h2_destroy() 77{ 78 ip -6 route del default vrf v$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 84switch_create() 85{ 86 ip link add name br0 type bridge mcast_snooping 0 87 ip link set dev br0 up 88 89 ip link set dev $swp1 master br0 90 ip link set dev $swp1 up 91 ip link set dev $swp2 master br0 92 ip link set dev $swp2 up 93 94 tc qdisc add dev $swp1 clsact 95 tc qdisc add dev $swp2 clsact 96 97 __addr_add_del br0 add 192.0.2.2/24 2001:db8:1::2/64 98 __addr_add_del br0 add 198.51.100.2/24 2001:db8:2::2/64 99} 100 101switch_destroy() 102{ 103 __addr_add_del br0 del 198.51.100.2/24 2001:db8:2::2/64 104 __addr_add_del br0 del 192.0.2.2/24 2001:db8:1::2/64 105 106 tc qdisc del dev $swp2 clsact 107 tc qdisc del dev $swp1 clsact 108 109 ip link set dev $swp2 down 110 ip link set dev $swp2 nomaster 111 ip link set dev $swp1 down 112 ip link set dev $swp1 nomaster 113 114 ip link set dev br0 down 115 ip link del dev br0 116} 117 118ping_ipv4() 119{ 120 ping_test $h1 198.51.100.1 ": h1->h2" 121} 122 123ping_ipv6() 124{ 125 ping6_test $h1 2001:db8:2::1 ": h1->h2" 126} 127 128fwd_mark_ipv4() 129{ 130 # Transmit packets from H1 to H2 and make sure they are trapped at 131 # swp1 due to loopback error, but only forwarded by the ASIC through 132 # swp2 133 134 tc filter add dev $swp1 ingress protocol ip pref 1 handle 101 flower \ 135 skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \ 136 action pass 137 138 tc filter add dev $swp2 egress protocol ip pref 1 handle 101 flower \ 139 skip_hw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \ 140 action pass 141 142 tc filter add dev $swp2 egress protocol ip pref 2 handle 102 flower \ 143 skip_sw dst_ip 198.51.100.1 ip_proto udp dst_port 52768 \ 144 action pass 145 146 ip vrf exec v$h1 $MZ $h1 -c 10 -d 100msec -p 64 -A 192.0.2.1 \ 147 -B 198.51.100.1 -t udp dp=52768,sp=42768 -q 148 149 RET=0 150 151 tc_check_packets "dev $swp1 ingress" 101 10 152 check_err $? 153 154 log_test "fwd mark: trapping IPv4 packets due to LBERROR" 155 156 RET=0 157 158 tc_check_packets "dev $swp2 egress" 101 0 159 check_err $? 160 161 log_test "fwd mark: forwarding IPv4 packets in software" 162 163 RET=0 164 165 tc_check_packets "dev $swp2 egress" 102 10 166 check_err $? 167 168 log_test "fwd mark: forwarding IPv4 packets in hardware" 169 170 tc filter del dev $swp2 egress protocol ip pref 2 handle 102 flower 171 tc filter del dev $swp2 egress protocol ip pref 1 handle 101 flower 172 tc filter del dev $swp1 ingress protocol ip pref 1 handle 101 flower 173} 174 175fwd_mark_ipv6() 176{ 177 tc filter add dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower \ 178 skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \ 179 action pass 180 181 tc filter add dev $swp2 egress protocol ipv6 pref 1 handle 101 flower \ 182 skip_hw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \ 183 action pass 184 185 tc filter add dev $swp2 egress protocol ipv6 pref 2 handle 102 flower \ 186 skip_sw dst_ip 2001:db8:2::1 ip_proto udp dst_port 52768 \ 187 action pass 188 189 ip vrf exec v$h1 $MZ $h1 -6 -c 10 -d 100msec -p 64 -A 2001:db8:1::1 \ 190 -B 2001:db8:2::1 -t udp dp=52768,sp=42768 -q 191 192 RET=0 193 194 tc_check_packets "dev $swp1 ingress" 101 10 195 check_err $? 196 197 log_test "fwd mark: trapping IPv6 packets due to LBERROR" 198 199 RET=0 200 201 tc_check_packets "dev $swp2 egress" 101 0 202 check_err $? 203 204 log_test "fwd mark: forwarding IPv6 packets in software" 205 206 RET=0 207 208 tc_check_packets "dev $swp2 egress" 102 10 209 check_err $? 210 211 log_test "fwd mark: forwarding IPv6 packets in hardware" 212 213 tc filter del dev $swp2 egress protocol ipv6 pref 2 handle 102 flower 214 tc filter del dev $swp2 egress protocol ipv6 pref 1 handle 101 flower 215 tc filter del dev $swp1 ingress protocol ipv6 pref 1 handle 101 flower 216} 217 218setup_prepare() 219{ 220 h1=${NETIFS[p1]} 221 swp1=${NETIFS[p2]} 222 223 swp2=${NETIFS[p3]} 224 h2=${NETIFS[p4]} 225 226 vrf_prepare 227 forwarding_enable 228 229 sysctl_set net.ipv4.conf.all.accept_redirects 0 230 sysctl_set net.ipv6.conf.all.accept_redirects 0 231 232 h1_create 233 h2_create 234 switch_create 235} 236 237cleanup() 238{ 239 pre_cleanup 240 241 switch_destroy 242 h2_destroy 243 h1_destroy 244 245 sysctl_restore net.ipv6.conf.all.accept_redirects 246 sysctl_restore net.ipv4.conf.all.accept_redirects 247 248 forwarding_restore 249 vrf_cleanup 250} 251 252trap cleanup EXIT 253 254setup_prepare 255setup_wait 256 257tests_run 258 259exit $EXIT_STATUS