tools/testing/selftests/net/fib_nexthop_multiprefix.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Validate cached routes in fib{6}_nh that is used by multiple prefixes.
   5 # Validate a different # exception is generated in h0 for each remote host.
   6 #
   7 #               h1
   8 #            /
   9 #    h0 - r1 -  h2
  10 #            \
  11 #               h3
  12 #
  13 # routing in h0 to hN is done with nexthop objects.
  14
  15 PAUSE_ON_FAIL=no
  16 VERBOSE=0
  17
  18 which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
  19
  20 ################################################################################
  21 # helpers
  22
  23 log_test()
  24 {
  25         local rc=$1
  26         local expected=$2
  27         local msg="$3"
  28
  29         if [ ${rc} -eq ${expected} ]; then
  30                 printf "TEST: %-60s  [ OK ]\n" "${msg}"
  31                 nsuccess=$((nsuccess+1))
  32         else
  33                 ret=1
  34                 nfail=$((nfail+1))
  35                 printf "TEST: %-60s  [FAIL]\n" "${msg}"
  36                 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
  37                         echo
  38                         echo "hit enter to continue, 'q' to quit"
  39                         read a
  40                         [ "$a" = "q" ] && exit 1
  41                 fi
  42         fi
  43
  44         [ "$VERBOSE" = "1" ] && echo
  45 }
  46
  47 run_cmd()
  48 {
  49         local cmd="$*"
  50         local out
  51         local rc
  52
  53         if [ "$VERBOSE" = "1" ]; then
  54                 echo "COMMAND: $cmd"
  55         fi
  56
  57         out=$(eval $cmd 2>&1)
  58         rc=$?
  59         if [ "$VERBOSE" = "1" -a -n "$out" ]; then
  60                 echo "$out"
  61         fi
  62
  63         [ "$VERBOSE" = "1" ] && echo
  64
  65         return $rc
  66 }
  67
  68 ################################################################################
  69 # config
  70
  71 create_ns()
  72 {
  73         local ns=${1}
  74
  75         ip netns del ${ns} 2>/dev/null
  76
  77         ip netns add ${ns}
  78         ip -netns ${ns} addr add 127.0.0.1/8 dev lo
  79         ip -netns ${ns} link set lo up
  80
  81         ip netns exec ${ns} sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
  82         case ${ns} in
  83         h*)
  84                 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
  85                 ;;
  86         r*)
  87                 ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
  88                 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
  89                 ;;
  90         esac
  91 }
  92
  93 setup()
  94 {
  95         local ns
  96         local i
  97
  98         #set -e
  99
 100         for ns in h0 r1 h1 h2 h3
 101         do
 102                 create_ns ${ns}
 103         done
 104
 105         #
 106         # create interconnects
 107         #
 108
 109         for i in 0 1 2 3
 110         do
 111                 ip -netns h${i} li add eth0 type veth peer name r1h${i}
 112                 ip -netns h${i} li set eth0 up
 113                 ip -netns h${i} li set r1h${i} netns r1 name eth${i} up
 114
 115                 ip -netns h${i}    addr add dev eth0 172.16.10${i}.1/24
 116                 ip -netns h${i} -6 addr add dev eth0 2001:db8:10${i}::1/64
 117                 ip -netns r1    addr add dev eth${i} 172.16.10${i}.254/24
 118                 ip -netns r1 -6 addr add dev eth${i} 2001:db8:10${i}::64/64
 119         done
 120
 121         ip -netns h0 nexthop add id 4 via 172.16.100.254 dev eth0
 122         ip -netns h0 nexthop add id 6 via 2001:db8:100::64 dev eth0
 123
 124         # routing from h0 to h1-h3 and back
 125         for i in 1 2 3
 126         do
 127                 ip -netns h0    ro add 172.16.10${i}.0/24 nhid 4
 128                 ip -netns h${i} ro add 172.16.100.0/24 via 172.16.10${i}.254
 129
 130                 ip -netns h0    -6 ro add 2001:db8:10${i}::/64 nhid 6
 131                 ip -netns h${i} -6 ro add 2001:db8:100::/64 via 2001:db8:10${i}::64
 132         done
 133
 134         if [ "$VERBOSE" = "1" ]; then
 135                 echo
 136                 echo "host 1 config"
 137                 ip -netns h0 li sh
 138                 ip -netns h0 ro sh
 139                 ip -netns h0 -6 ro sh
 140         fi
 141
 142         #set +e
 143 }
 144
 145 cleanup()
 146 {
 147         for n in h0 r1 h1 h2 h3
 148         do
 149                 ip netns del ${n} 2>/dev/null
 150         done
 151 }
 152
 153 change_mtu()
 154 {
 155         local hostid=$1
 156         local mtu=$2
 157
 158         run_cmd ip -netns h${hostid} li set eth0 mtu ${mtu}
 159         run_cmd ip -netns r1 li set eth${hostid} mtu ${mtu}
 160 }
 161
 162 ################################################################################
 163 # validate exceptions
 164
 165 validate_v4_exception()
 166 {
 167         local i=$1
 168         local mtu=$2
 169         local ping_sz=$3
 170         local dst="172.16.10${i}.1"
 171         local h0=172.16.100.1
 172         local r1=172.16.100.254
 173         local rc
 174
 175         if [ ${ping_sz} != "0" ]; then
 176                 run_cmd ip netns exec h0 ping -s ${ping_sz} -c5 -w5 ${dst}
 177         fi
 178
 179         if [ "$VERBOSE" = "1" ]; then
 180                 echo "Route get"
 181                 ip -netns h0 ro get ${dst}
 182                 echo "Searching for:"
 183                 echo "    cache .* mtu ${mtu}"
 184                 echo
 185         fi
 186
 187         ip -netns h0 ro get ${dst} | \
 188         grep -q "cache .* mtu ${mtu}"
 189         rc=$?
 190
 191         log_test $rc 0 "IPv4: host 0 to host ${i}, mtu ${mtu}"
 192 }
 193
 194 validate_v6_exception()
 195 {
 196         local i=$1
 197         local mtu=$2
 198         local ping_sz=$3
 199         local dst="2001:db8:10${i}::1"
 200         local h0=2001:db8:100::1
 201         local r1=2001:db8:100::64
 202         local rc
 203
 204         if [ ${ping_sz} != "0" ]; then
 205                 run_cmd ip netns exec h0 ${ping6} -s ${ping_sz} -c5 -w5 ${dst}
 206         fi
 207
 208         if [ "$VERBOSE" = "1" ]; then
 209                 echo "Route get"
 210                 ip -netns h0 -6 ro get ${dst}
 211                 echo "Searching for:"
 212                 echo "    ${dst} from :: via ${r1} dev eth0 src ${h0} .* mtu ${mtu}"
 213                 echo
 214         fi
 215
 216         ip -netns h0 -6 ro get ${dst} | \
 217         grep -q "${dst} from :: via ${r1} dev eth0 src ${h0} .* mtu ${mtu}"
 218         rc=$?
 219
 220         log_test $rc 0 "IPv6: host 0 to host ${i}, mtu ${mtu}"
 221 }
 222
 223 ################################################################################
 224 # main
 225
 226 while getopts :pv o
 227 do
 228         case $o in
 229                 p) PAUSE_ON_FAIL=yes;;
 230                 v) VERBOSE=1;;
 231         esac
 232 done
 233
 234 cleanup
 235 setup
 236 sleep 2
 237
 238 cpus=$(cat  /sys/devices/system/cpu/online)
 239 cpus="$(seq ${cpus/-/ })"
 240 ret=0
 241 for i in 1 2 3
 242 do
 243         # generate a cached route per-cpu
 244         for c in ${cpus}; do
 245                 run_cmd taskset -c ${c} ip netns exec h0 ping -c1 -w1 172.16.10${i}.1
 246                 [ $? -ne 0 ] && printf "\nERROR: ping to h${i} failed\n" && ret=1
 247
 248                 run_cmd taskset -c ${c} ip netns exec h0 ${ping6} -c1 -w1 2001:db8:10${i}::1
 249                 [ $? -ne 0 ] && printf "\nERROR: ping6 to h${i} failed\n" && ret=1
 250
 251                 [ $ret -ne 0 ] && break
 252         done
 253         [ $ret -ne 0 ] && break
 254 done
 255
 256 if [ $ret -eq 0 ]; then
 257         # generate different exceptions in h0 for h1, h2 and h3
 258         change_mtu 1 1300
 259         validate_v4_exception 1 1300 1350
 260         validate_v6_exception 1 1300 1350
 261         echo
 262
 263         change_mtu 2 1350
 264         validate_v4_exception 2 1350 1400
 265         validate_v6_exception 2 1350 1400
 266         echo
 267
 268         change_mtu 3 1400
 269         validate_v4_exception 3 1400 1450
 270         validate_v6_exception 3 1400 1450
 271         echo
 272
 273         validate_v4_exception 1 1300 0
 274         validate_v6_exception 1 1300 0
 275         echo
 276
 277         validate_v4_exception 2 1350 0
 278         validate_v6_exception 2 1350 0
 279         echo
 280
 281         validate_v4_exception 3 1400 0
 282         validate_v6_exception 3 1400 0
 283
 284         # targeted deletes to trigger cleanup paths in kernel
 285         ip -netns h0 ro del 172.16.102.0/24 nhid 4
 286         ip -netns h0 -6 ro del 2001:db8:102::/64 nhid 6
 287
 288         ip -netns h0 nexthop del id 4
 289         ip -netns h0 nexthop del id 6
 290 fi
 291
 292 cleanup