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 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0+
 #
 # Author: Justin Iurman <justin.iurman@uliege.be>
 #
 # This script evaluates the IOAM insertion for IPv6 by checking the IOAM data
 # consistency directly inside packets on the receiver side. Tests are divided
 # into three categories: OUTPUT (evaluates the IOAM processing by the sender),
 # INPUT (evaluates the IOAM processing by a receiver) and GLOBAL (evaluates
 # wider use cases that do not fall into the other two categories). Both OUTPUT
 # and INPUT tests only use a two-node topology (alpha and beta), while GLOBAL
 # tests use the entire three-node topology (alpha, beta, gamma). Each test is
 # documented inside its own handler in the code below.
 #
 # An IOAM domain is configured from Alpha to Gamma but not on the reverse path.
 # When either Beta or Gamma is the destination (depending on the test category),
 # Alpha adds an IOAM option (Pre-allocated Trace) inside a Hop-by-hop.
 #
 #
 #            +-------------------+            +-------------------+
 #            |                   |            |                   |
 #            |    Alpha netns    |            |    Gamma netns    |
 #            |                   |            |                   |
 #            |  +-------------+  |            |  +-------------+  |
 #            |  |    veth0    |  |            |  |    veth0    |  |
 #            |  |  db01::2/64 |  |            |  |  db02::2/64 |  |
 #            |  +-------------+  |            |  +-------------+  |
 #            |         .         |            |         .         |
 #            +-------------------+            +-------------------+
 #                      .                                .
 #                      .                                .
 #                      .                                .
 #            +----------------------------------------------------+
 #            |         .                                .         |
 #            |  +-------------+                  +-------------+  |
 #            |  |    veth0    |                  |    veth1    |  |
 #            |  |  db01::1/64 | ................ |  db02::1/64 |  |
 #            |  +-------------+                  +-------------+  |
 #            |                                                    |
 #            |                      Beta netns                    |
 #            |                                                    |
 #            +----------------------------------------------------+
 #
 #
 #
 #        =============================================================
 #        |                Alpha - IOAM configuration                 |
 #        +===========================================================+
 #        | Node ID             | 1                                   |
 #        +-----------------------------------------------------------+
 #        | Node Wide ID        | 11111111                            |
 #        +-----------------------------------------------------------+
 #        | Ingress ID          | 0xffff (default value)              |
 #        +-----------------------------------------------------------+
 #        | Ingress Wide ID     | 0xffffffff (default value)          |
 #        +-----------------------------------------------------------+
 #        | Egress ID           | 101                                 |
 #        +-----------------------------------------------------------+
 #        | Egress Wide ID      | 101101                              |
 #        +-----------------------------------------------------------+
 #        | Namespace Data      | 0xdeadbee0                          |
 #        +-----------------------------------------------------------+
 #        | Namespace Wide Data | 0xcafec0caf00dc0de                  |
 #        +-----------------------------------------------------------+
 #        | Schema ID           | 777                                 |
 #        +-----------------------------------------------------------+
 #        | Schema Data         | something that will be 4n-aligned   |
 #        +-----------------------------------------------------------+
 #
 #
 #        =============================================================
 #        |                 Beta - IOAM configuration                 |
 #        +===========================================================+
 #        | Node ID             | 2                                   |
 #        +-----------------------------------------------------------+
 #        | Node Wide ID        | 22222222                            |
 #        +-----------------------------------------------------------+
 #        | Ingress ID          | 201                                 |
 #        +-----------------------------------------------------------+
 #        | Ingress Wide ID     | 201201                              |
 #        +-----------------------------------------------------------+
 #        | Egress ID           | 202                                 |
 #        +-----------------------------------------------------------+
 #        | Egress Wide ID      | 202202                              |
 #        +-----------------------------------------------------------+
 #        | Namespace Data      | 0xdeadbee1                          |
 #        +-----------------------------------------------------------+
 #        | Namespace Wide Data | 0xcafec0caf11dc0de                  |
 #        +-----------------------------------------------------------+
 #        | Schema ID           | 666                                 |
 #        +-----------------------------------------------------------+
 #        | Schema Data         | Hello there -Obi                    |
 #        +-----------------------------------------------------------+
 #
 #
 #        =============================================================
 #        |                Gamma - IOAM configuration                 |
 #        +===========================================================+
 #        | Node ID             | 3                                   |
 #        +-----------------------------------------------------------+
 #        | Node Wide ID        | 33333333                            |
 #        +-----------------------------------------------------------+
 #        | Ingress ID          | 301                                 |
 #        +-----------------------------------------------------------+
 #        | Ingress Wide ID     | 301301                              |
 #        +-----------------------------------------------------------+
 #        | Egress ID           | 0xffff (default value)              |
 #        +-----------------------------------------------------------+
 #        | Egress Wide ID      | 0xffffffff (default value)          |
 #        +-----------------------------------------------------------+
 #        | Namespace Data      | 0xdeadbee2                          |
 #        +-----------------------------------------------------------+
 #        | Namespace Wide Data | 0xcafec0caf22dc0de                  |
 #        +-----------------------------------------------------------+
 #        | Schema ID           | 0xffffff (= None)                   |
 #        +-----------------------------------------------------------+
 #        | Schema Data         |                                     |
 #        +-----------------------------------------------------------+
 
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
 ################################################################################
 #                                                                              #
 # WARNING: Be careful if you modify the block below - it MUST be kept          #
 #          synchronized with configurations inside ioam6_parser.c and always   #
 #          reflect the same.                                                   #
 #                                                                              #
 ################################################################################
 
 ALPHA=(
         1                                       # ID
         11111111                                # Wide ID
         0xffff                                  # Ingress ID
         0xffffffff                              # Ingress Wide ID
         101                                     # Egress ID
         101101                                  # Egress Wide ID
         0xdeadbee0                              # Namespace Data
         0xcafec0caf00dc0de                      # Namespace Wide Data
         777                                     # Schema ID (0xffffff = None)
         "something that will be 4n-aligned"     # Schema Data
 )
 
 BETA=(
         2
         22222222
         201
         201201
         202
         202202
         0xdeadbee1
         0xcafec0caf11dc0de
         666
         "Hello there -Obi"
 )
 
 GAMMA=(
         3
         33333333
         301
         301301
         0xffff
         0xffffffff
         0xdeadbee2
         0xcafec0caf22dc0de
         0xffffff
         ""
 )
 
 TESTS_OUTPUT="
         out_undef_ns
         out_no_room
         out_bits
         out_full_supp_trace
 "
 
 TESTS_INPUT="
         in_undef_ns
         in_no_room
         in_oflag
         in_bits
         in_full_supp_trace
 "
 
 TESTS_GLOBAL="
         fwd_full_supp_trace
 "
 
 
 ################################################################################
 #                                                                              #
 #                                   LIBRARY                                    #
 #                                                                              #
 ################################################################################
 
 check_kernel_compatibility()
 {
   ip netns add ioam-tmp-node
   ip link add name veth0 netns ioam-tmp-node type veth \
          peer name veth1 netns ioam-tmp-node
 
   ip -netns ioam-tmp-node link set veth0 up
   ip -netns ioam-tmp-node link set veth1 up
 
   ip -netns ioam-tmp-node ioam namespace add 0
   ns_ad=$?
 
   ip -netns ioam-tmp-node ioam namespace show | grep -q "namespace 0"
   ns_sh=$?
 
   if [[ $ns_ad != 0 || $ns_sh != 0 ]]
   then
     echo "SKIP: kernel version probably too old, missing ioam support"
     ip link del veth0 2>/dev/null || true
     ip netns del ioam-tmp-node || true
     exit $ksft_skip
   fi
 
   ip -netns ioam-tmp-node route add db02::/64 encap ioam6 mode inline \
          trace prealloc type 0x800000 ns 0 size 4 dev veth0
   tr_ad=$?
 
   ip -netns ioam-tmp-node -6 route | grep -q "encap ioam6"
   tr_sh=$?
 
   if [[ $tr_ad != 0 || $tr_sh != 0 ]]
   then
     echo "SKIP: cannot attach an ioam trace to a route, did you compile" \
          "without CONFIG_IPV6_IOAM6_LWTUNNEL?"
     ip link del veth0 2>/dev/null || true
     ip netns del ioam-tmp-node || true
     exit $ksft_skip
   fi
 
   ip link del veth0 2>/dev/null || true
   ip netns del ioam-tmp-node || true
 
   lsmod | grep -q "ip6_tunnel"
   ip6tnl_loaded=$?
 
   if [ $ip6tnl_loaded = 0 ]
   then
     encap_tests=0
   else
     modprobe ip6_tunnel &>/dev/null
     lsmod | grep -q "ip6_tunnel"
     encap_tests=$?
 
     if [ $encap_tests != 0 ]
     then
       ip a | grep -q "ip6tnl0"
       encap_tests=$?
 
       if [ $encap_tests != 0 ]
       then
         echo "Note: ip6_tunnel not found neither as a module nor inside the" \
              "kernel, tests that require it (encap mode) will be omitted"
       fi
     fi
   fi
 }
 
 cleanup()
 {
   ip link del ioam-veth-alpha 2>/dev/null || true
   ip link del ioam-veth-gamma 2>/dev/null || true
 
   ip netns del ioam-node-alpha || true
   ip netns del ioam-node-beta || true
   ip netns del ioam-node-gamma || true
 
   if [ $ip6tnl_loaded != 0 ]
   then
     modprobe -r ip6_tunnel 2>/dev/null || true
   fi
 }
 
 setup()
 {
   ip netns add ioam-node-alpha
   ip netns add ioam-node-beta
   ip netns add ioam-node-gamma
 
   ip link add name ioam-veth-alpha netns ioam-node-alpha type veth \
          peer name ioam-veth-betaL netns ioam-node-beta
   ip link add name ioam-veth-betaR netns ioam-node-beta type veth \
          peer name ioam-veth-gamma netns ioam-node-gamma
 
   ip -netns ioam-node-alpha link set ioam-veth-alpha name veth0
   ip -netns ioam-node-beta link set ioam-veth-betaL name veth0
   ip -netns ioam-node-beta link set ioam-veth-betaR name veth1
   ip -netns ioam-node-gamma link set ioam-veth-gamma name veth0
 
   ip -netns ioam-node-alpha addr add db01::2/64 dev veth0
   ip -netns ioam-node-alpha link set veth0 up
   ip -netns ioam-node-alpha link set lo up
   ip -netns ioam-node-alpha route add db02::/64 via db01::1 dev veth0
   ip -netns ioam-node-alpha route del db01::/64
   ip -netns ioam-node-alpha route add db01::/64 dev veth0
 
   ip -netns ioam-node-beta addr add db01::1/64 dev veth0
   ip -netns ioam-node-beta addr add db02::1/64 dev veth1
   ip -netns ioam-node-beta link set veth0 up
   ip -netns ioam-node-beta link set veth1 up
   ip -netns ioam-node-beta link set lo up
 
   ip -netns ioam-node-gamma addr add db02::2/64 dev veth0
   ip -netns ioam-node-gamma link set veth0 up
   ip -netns ioam-node-gamma link set lo up
   ip -netns ioam-node-gamma route add db01::/64 via db02::1 dev veth0
 
   # - IOAM config -
   ip netns exec ioam-node-alpha sysctl -wq net.ipv6.ioam6_id=${ALPHA[0]}
   ip netns exec ioam-node-alpha sysctl -wq net.ipv6.ioam6_id_wide=${ALPHA[1]}
   ip netns exec ioam-node-alpha sysctl -wq net.ipv6.conf.veth0.ioam6_id=${ALPHA[4]}
   ip netns exec ioam-node-alpha sysctl -wq net.ipv6.conf.veth0.ioam6_id_wide=${ALPHA[5]}
   ip -netns ioam-node-alpha ioam namespace add 123 data ${ALPHA[6]} wide ${ALPHA[7]}
   ip -netns ioam-node-alpha ioam schema add ${ALPHA[8]} "${ALPHA[9]}"
   ip -netns ioam-node-alpha ioam namespace set 123 schema ${ALPHA[8]}
 
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.all.forwarding=1
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.ioam6_id=${BETA[0]}
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.ioam6_id_wide=${BETA[1]}
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth0.ioam6_enabled=1
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth0.ioam6_id=${BETA[2]}
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth0.ioam6_id_wide=${BETA[3]}
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth1.ioam6_id=${BETA[4]}
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth1.ioam6_id_wide=${BETA[5]}
   ip -netns ioam-node-beta ioam namespace add 123 data ${BETA[6]} wide ${BETA[7]}
   ip -netns ioam-node-beta ioam schema add ${BETA[8]} "${BETA[9]}"
   ip -netns ioam-node-beta ioam namespace set 123 schema ${BETA[8]}
 
   ip netns exec ioam-node-gamma sysctl -wq net.ipv6.ioam6_id=${GAMMA[0]}
   ip netns exec ioam-node-gamma sysctl -wq net.ipv6.ioam6_id_wide=${GAMMA[1]}
   ip netns exec ioam-node-gamma sysctl -wq net.ipv6.conf.veth0.ioam6_enabled=1
   ip netns exec ioam-node-gamma sysctl -wq net.ipv6.conf.veth0.ioam6_id=${GAMMA[2]}
   ip netns exec ioam-node-gamma sysctl -wq net.ipv6.conf.veth0.ioam6_id_wide=${GAMMA[3]}
   ip -netns ioam-node-gamma ioam namespace add 123 data ${GAMMA[6]} wide ${GAMMA[7]}
 
   sleep 1
 
   ip netns exec ioam-node-alpha ping6 -c 5 -W 1 db02::2 &>/dev/null
   if [ $? != 0 ]
   then
     echo "Setup FAILED"
     cleanup &>/dev/null
     exit 0
   fi
 }
 
 log_test_passed()
 {
   local desc=$1
   printf "TEST: %-60s  [ OK ]\n" "${desc}"
 }
 
 log_test_failed()
 {
   local desc=$1
   printf "TEST: %-60s  [FAIL]\n" "${desc}"
 }
 
 log_results()
 {
   echo "- Tests passed: ${npassed}"
   echo "- Tests failed: ${nfailed}"
 }
 
 run_test()
 {
   local name=$1
   local desc=$2
   local node_src=$3
   local node_dst=$4
   local ip6_src=$5
   local ip6_dst=$6
   local if_dst=$7
   local trace_type=$8
   local ioam_ns=$9
 
   ip netns exec $node_dst ./ioam6_parser $if_dst $name $ip6_src $ip6_dst \
          $trace_type $ioam_ns &
   local spid=$!
   sleep 0.1
 
   ip netns exec $node_src ping6 -t 64 -c 1 -W 1 $ip6_dst &>/dev/null
   if [ $? != 0 ]
   then
     nfailed=$((nfailed+1))
     log_test_failed "${desc}"
     kill -2 $spid &>/dev/null
   else
     wait $spid
     if [ $? = 0 ]
     then
       npassed=$((npassed+1))
       log_test_passed "${desc}"
     else
       nfailed=$((nfailed+1))
       log_test_failed "${desc}"
     fi
   fi
 }
 
 run()
 {
   echo
   printf "%0.s-" {1..74}
   echo
   echo "OUTPUT tests"
   printf "%0.s-" {1..74}
   echo
 
   # set OUTPUT settings
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth0.ioam6_enabled=0
 
   for t in $TESTS_OUTPUT
   do
     $t "inline"
     [ $encap_tests = 0 ] && $t "encap"
   done
 
   # clean OUTPUT settings
   ip netns exec ioam-node-beta sysctl -wq net.ipv6.conf.veth0.ioam6_enabled=1
   ip -netns ioam-node-alpha route change db01::/64 dev veth0
 
 
   echo
   printf "%0.s-" {1..74}
   echo
   echo "INPUT tests"
   printf "%0.s-" {1..74}
   echo
 
   # set INPUT settings
   ip -netns ioam-node-alpha ioam namespace del 123
 
   for t in $TESTS_INPUT
   do
     $t "inline"
     [ $encap_tests = 0 ] && $t "encap"
   done
 
   # clean INPUT settings
   ip -netns ioam-node-alpha ioam namespace add 123 \
          data ${ALPHA[6]} wide ${ALPHA[7]}
   ip -netns ioam-node-alpha ioam namespace set 123 schema ${ALPHA[8]}
   ip -netns ioam-node-alpha route change db01::/64 dev veth0
 
   echo
   printf "%0.s-" {1..74}
   echo
   echo "GLOBAL tests"
   printf "%0.s-" {1..74}
   echo
 
   for t in $TESTS_GLOBAL
   do
     $t "inline"
     [ $encap_tests = 0 ] && $t "encap"
   done
 
   echo
   log_results
 }
 
 bit2type=(
   0x800000 0x400000 0x200000 0x100000 0x080000 0x040000 0x020000 0x010000
   0x008000 0x004000 0x002000 0x001000 0x000800 0x000400 0x000200 0x000100
   0x000080 0x000040 0x000020 0x000010 0x000008 0x000004 0x000002
 )
 bit2size=( 4 4 4 4 4 4 4 4 8 8 8 4 4 4 4 4 4 4 4 4 4 4 4 )
 
 
 ################################################################################
 #                                                                              #
 #                              OUTPUT tests                                    #
 #                                                                              #
 #   Two nodes (sender/receiver), IOAM disabled on ingress for the receiver.    #
 ################################################################################
 
 out_undef_ns()
 {
   ##############################################################################
   # Make sure that the encap node won't fill the trace if the chosen IOAM      #
   # namespace is not configured locally.                                       #
   ##############################################################################
   local desc="Unknown IOAM namespace"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0x800000 ns 0 size 4 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0x800000 0
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 out_no_room()
 {
   ##############################################################################
   # Make sure that the encap node won't fill the trace and will set the        #
   # Overflow flag since there is no room enough for its data.                  #
   ##############################################################################
   local desc="Missing trace room"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0xc00000 ns 123 size 4 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0xc00000 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 out_bits()
 {
   ##############################################################################
   # Make sure that, for each trace type bit, the encap node will either:       #
   #  (i)  fill the trace with its data when it is a supported bit              #
   #  (ii) not fill the trace with its data when it is an unsupported bit       #
   ##############################################################################
   local desc="Trace type with bit <n> only"
 
   local tmp=${bit2size[22]}
   bit2size[22]=$(( $tmp + ${#ALPHA[9]} + ((4 - (${#ALPHA[9]} % 4)) % 4) ))
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   for i in {0..22}
   do
     ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
            trace prealloc type ${bit2type[$i]} ns 123 size ${bit2size[$i]} \
            dev veth0 &>/dev/null
 
     local cmd_res=$?
     local descr="${desc/<n>/$i}"
 
     if [[ $i -ge 12 && $i -le 21 ]]
     then
       if [ $cmd_res != 0 ]
       then
         npassed=$((npassed+1))
         log_test_passed "$descr"
       else
         nfailed=$((nfailed+1))
         log_test_failed "$descr"
       fi
     else
         run_test "out_bit$i" "$descr ($1 mode)" ioam-node-alpha \
            ioam-node-beta db01::2 db01::1 veth0 ${bit2type[$i]} 123
     fi
   done
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 
   bit2size[22]=$tmp
 }
 
 out_full_supp_trace()
 {
   ##############################################################################
   # Make sure that the encap node will correctly fill a full trace. Be careful,#
   # "full trace" here does NOT mean all bits (only supported ones).            #
   ##############################################################################
   local desc="Full supported trace"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0xfff002 ns 123 size 100 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0xfff002 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 
 ################################################################################
 #                                                                              #
 #                               INPUT tests                                    #
 #                                                                              #
 #     Two nodes (sender/receiver), the sender MUST NOT fill the trace upon     #
 #     insertion -> the IOAM namespace configured on the sender is removed      #
 #     and is used in the inserted trace to force the sender not to fill it.    #
 ################################################################################
 
 in_undef_ns()
 {
   ##############################################################################
   # Make sure that the receiving node won't fill the trace if the related IOAM #
   # namespace is not configured locally.                                       #
   ##############################################################################
   local desc="Unknown IOAM namespace"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0x800000 ns 0 size 4 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0x800000 0
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 in_no_room()
 {
   ##############################################################################
   # Make sure that the receiving node won't fill the trace and will set the    #
   # Overflow flag if there is no room enough for its data.                     #
   ##############################################################################
   local desc="Missing trace room"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0xc00000 ns 123 size 4 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0xc00000 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 in_bits()
 {
   ##############################################################################
   # Make sure that, for each trace type bit, the receiving node will either:   #
   #  (i)  fill the trace with its data when it is a supported bit              #
   #  (ii) not fill the trace with its data when it is an unsupported bit       #
   ##############################################################################
   local desc="Trace type with bit <n> only"
 
   local tmp=${bit2size[22]}
   bit2size[22]=$(( $tmp + ${#BETA[9]} + ((4 - (${#BETA[9]} % 4)) % 4) ))
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   for i in {0..11} {22..22}
   do
     ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
            trace prealloc type ${bit2type[$i]} ns 123 size ${bit2size[$i]} \
            dev veth0
 
     run_test "in_bit$i" "${desc/<n>/$i} ($1 mode)" ioam-node-alpha \
            ioam-node-beta db01::2 db01::1 veth0 ${bit2type[$i]} 123
   done
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 
   bit2size[22]=$tmp
 }
 
 in_oflag()
 {
   ##############################################################################
   # Make sure that the receiving node won't fill the trace since the Overflow  #
   # flag is set.                                                               #
   ##############################################################################
   local desc="Overflow flag is set"
 
   # Exception:
   #   Here, we need the sender to set the Overflow flag. For that, we will add
   #   back the IOAM namespace that was previously configured on the sender.
   ip -netns ioam-node-alpha ioam namespace add 123
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0xc00000 ns 123 size 4 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0xc00000 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 
   # And we clean the exception for this test to get things back to normal for
   # other INPUT tests
   ip -netns ioam-node-alpha ioam namespace del 123
 }
 
 in_full_supp_trace()
 {
   ##############################################################################
   # Make sure that the receiving node will correctly fill a full trace. Be     #
   # careful, "full trace" here does NOT mean all bits (only supported ones).   #
   ##############################################################################
   local desc="Full supported trace"
 
   [ "$1" = "encap" ] && mode="$1 tundst db01::1" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db01::/64 encap ioam6 mode $mode \
          trace prealloc type 0xfff002 ns 123 size 80 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-beta \
          db01::2 db01::1 veth0 0xfff002 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-beta link set ip6tnl0 down
 }
 
 
 ################################################################################
 #                                                                              #
 #                              GLOBAL tests                                    #
 #                                                                              #
 #   Three nodes (sender/router/receiver), IOAM fully enabled on every node.    #
 ################################################################################
 
 fwd_full_supp_trace()
 {
   ##############################################################################
   # Make sure that all three nodes correctly filled the full supported trace   #
   # by checking that the trace data is consistent with the predefined config.  #
   ##############################################################################
   local desc="Forward - Full supported trace"
 
   [ "$1" = "encap" ] && mode="$1 tundst db02::2" || mode="$1"
   [ "$1" = "encap" ] && ip -netns ioam-node-gamma link set ip6tnl0 up
 
   ip -netns ioam-node-alpha route change db02::/64 encap ioam6 mode $mode \
          trace prealloc type 0xfff002 ns 123 size 244 via db01::1 dev veth0
 
   run_test ${FUNCNAME[0]} "${desc} ($1 mode)" ioam-node-alpha ioam-node-gamma \
          db01::2 db02::2 veth0 0xfff002 123
 
   [ "$1" = "encap" ] && ip -netns ioam-node-gamma link set ip6tnl0 down
 }
 
 
 ################################################################################
 #                                                                              #
 #                                     MAIN                                     #
 #                                                                              #
 ################################################################################
 
 npassed=0
 nfailed=0
 
 if [ "$(id -u)" -ne 0 ]
 then
   echo "SKIP: Need root privileges"
   exit $ksft_skip
 fi
 
 if [ ! -x "$(command -v ip)" ]
 then
   echo "SKIP: Could not run test without ip tool"
   exit $ksft_skip
 fi
 
 ip ioam &>/dev/null
 if [ $? = 1 ]
 then
   echo "SKIP: iproute2 too old, missing ioam command"
   exit $ksft_skip
 fi
 
 check_kernel_compatibility
 
 cleanup &>/dev/null
 setup
 run
 cleanup &>/dev/null

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