name : fib_nexthop_multiprefix.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Validate cached routes in fib{6}_nh that is used by multiple prefixes. # Validate a different # exception is generated in h0 for each remote host. # # h1 # / # h0 - r1 - h2 # \ # h3 # # routing in h0 to hN is done with nexthop objects. source lib.sh PAUSE_ON_FAIL=no VERBOSE=0 which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) ################################################################################ # helpers log_test() { local rc=$1 local expected=$2 local msg="$3" if [ ${rc} -eq ${expected} ]; then printf "TEST: %-60s [ OK ]\n" "${msg}" nsuccess=$((nsuccess+1)) else ret=1 nfail=$((nfail+1)) printf "TEST: %-60s [FAIL]\n" "${msg}" if [ "${PAUSE_ON_FAIL}" = "yes" ]; then echo echo "hit enter to continue, 'q' to quit" read a [ "$a" = "q" ] && exit 1 fi fi [ "$VERBOSE" = "1" ] && echo } run_cmd() { local cmd="$*" local out local rc if [ "$VERBOSE" = "1" ]; then echo "COMMAND: $cmd" fi out=$(eval $cmd 2>&1) rc=$? if [ "$VERBOSE" = "1" -a -n "$out" ]; then echo "$out" fi [ "$VERBOSE" = "1" ] && echo return $rc } ################################################################################ # config create_ns() { local ns=${1} ip netns exec ${ns} sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1 case ${ns} in h*) ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0 ;; r*) ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1 ;; esac } setup() { local ns local i #set -e setup_ns h0 r1 h1 h2 h3 h[0]=$h0 h[1]=$h1 h[2]=$h2 h[3]=$h3 r[1]=$r1 for ns in ${h[0]} ${r[1]} ${h[1]} ${h[2]} ${h[3]} do create_ns ${ns} done # # create interconnects # for i in 0 1 2 3 do ip -netns ${h[$i]} li add eth0 type veth peer name r1h${i} ip -netns ${h[$i]} li set eth0 up ip -netns ${h[$i]} li set r1h${i} netns ${r[1]} name eth${i} up ip -netns ${h[$i]} addr add dev eth0 172.16.10${i}.1/24 ip -netns ${h[$i]} -6 addr add dev eth0 2001:db8:10${i}::1/64 ip -netns ${r[1]} addr add dev eth${i} 172.16.10${i}.254/24 ip -netns ${r[1]} -6 addr add dev eth${i} 2001:db8:10${i}::64/64 done ip -netns ${h[0]} nexthop add id 4 via 172.16.100.254 dev eth0 ip -netns ${h[0]} nexthop add id 6 via 2001:db8:100::64 dev eth0 # routing from ${h[0]} to h1-h3 and back for i in 1 2 3 do ip -netns ${h[0]} ro add 172.16.10${i}.0/24 nhid 4 ip -netns ${h[$i]} ro add 172.16.100.0/24 via 172.16.10${i}.254 ip -netns ${h[0]} -6 ro add 2001:db8:10${i}::/64 nhid 6 ip -netns ${h[$i]} -6 ro add 2001:db8:100::/64 via 2001:db8:10${i}::64 done if [ "$VERBOSE" = "1" ]; then echo echo "host 1 config" ip -netns ${h[0]} li sh ip -netns ${h[0]} ro sh ip -netns ${h[0]} -6 ro sh fi #set +e } cleanup() { cleanup_all_ns } change_mtu() { local hostid=$1 local mtu=$2 run_cmd ip -netns h${hostid} li set eth0 mtu ${mtu} run_cmd ip -netns ${r1} li set eth${hostid} mtu ${mtu} } ################################################################################ # validate exceptions validate_v4_exception() { local i=$1 local mtu=$2 local ping_sz=$3 local dst="172.16.10${i}.1" local h0_ip=172.16.100.1 local r1_ip=172.16.100.254 local rc if [ ${ping_sz} != "0" ]; then run_cmd ip netns exec ${h0} ping -s ${ping_sz} -c5 -w5 ${dst} fi if [ "$VERBOSE" = "1" ]; then echo "Route get" ip -netns ${h0} ro get ${dst} echo "Searching for:" echo " cache .* mtu ${mtu}" echo fi ip -netns ${h0} ro get ${dst} | \ grep -q "cache .* mtu ${mtu}" rc=$? log_test $rc 0 "IPv4: host 0 to host ${i}, mtu ${mtu}" } validate_v6_exception() { local i=$1 local mtu=$2 local ping_sz=$3 local dst="2001:db8:10${i}::1" local h0_ip=2001:db8:100::1 local r1_ip=2001:db8:100::64 local rc if [ ${ping_sz} != "0" ]; then run_cmd ip netns exec ${h0} ${ping6} -s ${ping_sz} -c5 -w5 ${dst} fi if [ "$VERBOSE" = "1" ]; then echo "Route get" ip -netns ${h0} -6 ro get ${dst} echo "Searching for:" echo " ${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}" echo fi ip -netns ${h0} -6 ro get ${dst} | \ grep -q "${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}" rc=$? log_test $rc 0 "IPv6: host 0 to host ${i}, mtu ${mtu}" } ################################################################################ # main while getopts :pv o do case $o in p) PAUSE_ON_FAIL=yes;; v) VERBOSE=1;; esac done cleanup setup sleep 2 cpus=$(cat /sys/devices/system/cpu/online) cpus="$(seq ${cpus/-/ })" ret=0 for i in 1 2 3 do # generate a cached route per-cpu for c in ${cpus}; do run_cmd taskset -c ${c} ip netns exec ${h0} ping -c1 -w1 172.16.10${i}.1 [ $? -ne 0 ] && printf "\nERROR: ping to ${h[$i]} failed\n" && ret=1 run_cmd taskset -c ${c} ip netns exec ${h0} ${ping6} -c1 -w1 2001:db8:10${i}::1 [ $? -ne 0 ] && printf "\nERROR: ping6 to ${h[$i]} failed\n" && ret=1 [ $ret -ne 0 ] && break done [ $ret -ne 0 ] && break done if [ $ret -eq 0 ]; then # generate different exceptions in h0 for h1, h2 and h3 change_mtu 1 1300 validate_v4_exception 1 1300 1350 validate_v6_exception 1 1300 1350 echo change_mtu 2 1350 validate_v4_exception 2 1350 1400 validate_v6_exception 2 1350 1400 echo change_mtu 3 1400 validate_v4_exception 3 1400 1450 validate_v6_exception 3 1400 1450 echo validate_v4_exception 1 1300 0 validate_v6_exception 1 1300 0 echo validate_v4_exception 2 1350 0 validate_v6_exception 2 1350 0 echo validate_v4_exception 3 1400 0 validate_v6_exception 3 1400 0 # targeted deletes to trigger cleanup paths in kernel ip -netns ${h0} ro del 172.16.102.0/24 nhid 4 ip -netns ${h0} -6 ro del 2001:db8:102::/64 nhid 6 ip -netns ${h0} nexthop del id 4 ip -netns ${h0} nexthop del id 6 fi cleanup