samples/bpf/test_cgrp2_tc.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 MY_DIR=$(dirname $0)
   5 # Details on the bpf prog
   6 BPF_CGRP2_ARRAY_NAME='test_cgrp2_array_pin'
   7 BPF_PROG="$MY_DIR/test_cgrp2_tc_kern.o"
   8 BPF_SECTION='filter'
   9
  10 [ -z "$TC" ] && TC='tc'
  11 [ -z "$IP" ] && IP='ip'
  12
  13 # Names of the veth interface, net namespace...etc.
  14 HOST_IFC='ve'
  15 NS_IFC='vens'
  16 NS='ns'
  17
  18 find_mnt() {
  19     cat /proc/mounts | \
  20         awk '{ if ($3 == "'$1'" && mnt == "") { mnt = $2 }} END { print mnt }'
  21 }
  22
  23 # Init cgroup2 vars
  24 init_cgrp2_vars() {
  25     CGRP2_ROOT=$(find_mnt cgroup2)
  26     if [ -z "$CGRP2_ROOT" ]
  27     then
  28         CGRP2_ROOT='/mnt/cgroup2'
  29         MOUNT_CGRP2="yes"
  30     fi
  31     CGRP2_TC="$CGRP2_ROOT/tc"
  32     CGRP2_TC_LEAF="$CGRP2_TC/leaf"
  33 }
  34
  35 # Init bpf fs vars
  36 init_bpf_fs_vars() {
  37     local bpf_fs_root=$(find_mnt bpf)
  38     [ -n "$bpf_fs_root" ] || return -1
  39     BPF_FS_TC_SHARE="$bpf_fs_root/tc/globals"
  40 }
  41
  42 setup_cgrp2() {
  43     case $1 in
  44         start)
  45             if [ "$MOUNT_CGRP2" == 'yes' ]
  46             then
  47                 [ -d $CGRP2_ROOT ] || mkdir -p $CGRP2_ROOT
  48                 mount -t cgroup2 none $CGRP2_ROOT || return $?
  49             fi
  50             mkdir -p $CGRP2_TC_LEAF
  51             ;;
  52         *)
  53             rmdir $CGRP2_TC_LEAF && rmdir $CGRP2_TC
  54             [ "$MOUNT_CGRP2" == 'yes' ] && umount $CGRP2_ROOT
  55             ;;
  56     esac
  57 }
  58
  59 setup_bpf_cgrp2_array() {
  60     local bpf_cgrp2_array="$BPF_FS_TC_SHARE/$BPF_CGRP2_ARRAY_NAME"
  61     case $1 in
  62         start)
  63             $MY_DIR/test_cgrp2_array_pin -U $bpf_cgrp2_array -v $CGRP2_TC
  64             ;;
  65         *)
  66             [ -d "$BPF_FS_TC_SHARE" ] && rm -f $bpf_cgrp2_array
  67             ;;
  68     esac
  69 }
  70
  71 setup_net() {
  72     case $1 in
  73         start)
  74             $IP link add $HOST_IFC type veth peer name $NS_IFC || return $?
  75             $IP link set dev $HOST_IFC up || return $?
  76             sysctl -q net.ipv6.conf.$HOST_IFC.accept_dad=0
  77
  78             $IP netns add ns || return $?
  79             $IP link set dev $NS_IFC netns ns || return $?
  80             $IP -n $NS link set dev $NS_IFC up || return $?
  81             $IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.accept_dad=0
  82             $TC qdisc add dev $HOST_IFC clsact || return $?
  83             $TC filter add dev $HOST_IFC egress bpf da obj $BPF_PROG sec $BPF_SECTION || return $?
  84             ;;
  85         *)
  86             $IP netns del $NS
  87             $IP link del $HOST_IFC
  88             ;;
  89     esac
  90 }
  91
  92 run_in_cgrp() {
  93     # Fork another bash and move it under the specified cgroup.
  94     # It makes the cgroup cleanup easier at the end of the test.
  95     cmd='echo $$ > '
  96     cmd="$cmd $1/cgroup.procs; exec $2"
  97     bash -c "$cmd"
  98 }
  99
 100 do_test() {
 101     run_in_cgrp $CGRP2_TC_LEAF "ping -6 -c3 ff02::1%$HOST_IFC >& /dev/null"
 102     local dropped=$($TC -s qdisc show dev $HOST_IFC | tail -3 | \
 103                            awk '/drop/{print substr($7, 0, index($7, ",")-1)}')
 104     if [[ $dropped -eq 0 ]]
 105     then
 106         echo "FAIL"
 107         return 1
 108     else
 109         echo "Successfully filtered $dropped packets"
 110         return 0
 111     fi
 112 }
 113
 114 do_exit() {
 115     if [ "$DEBUG" == "yes" ] && [ "$MODE" != 'cleanuponly' ]
 116     then
 117         echo "------ DEBUG ------"
 118         echo "mount: "; mount | egrep '(cgroup2|bpf)'; echo
 119         echo "$CGRP2_TC_LEAF: "; ls -l $CGRP2_TC_LEAF; echo
 120         if [ -d "$BPF_FS_TC_SHARE" ]
 121         then
 122             echo "$BPF_FS_TC_SHARE: "; ls -l $BPF_FS_TC_SHARE; echo
 123         fi
 124         echo "Host net:"
 125         $IP netns
 126         $IP link show dev $HOST_IFC
 127         $IP -6 a show dev $HOST_IFC
 128         $TC -s qdisc show dev $HOST_IFC
 129         echo
 130         echo "$NS net:"
 131         $IP -n $NS link show dev $NS_IFC
 132         $IP -n $NS -6 link show dev $NS_IFC
 133         echo "------ DEBUG ------"
 134         echo
 135     fi
 136
 137     if [ "$MODE" != 'nocleanup' ]
 138     then
 139         setup_net stop
 140         setup_bpf_cgrp2_array stop
 141         setup_cgrp2 stop
 142     fi
 143 }
 144
 145 init_cgrp2_vars
 146 init_bpf_fs_vars
 147
 148 while [[ $# -ge 1 ]]
 149 do
 150     a="$1"
 151     case $a in
 152         debug)
 153             DEBUG='yes'
 154             shift 1
 155             ;;
 156         cleanup-only)
 157             MODE='cleanuponly'
 158             shift 1
 159             ;;
 160         no-cleanup)
 161             MODE='nocleanup'
 162             shift 1
 163             ;;
 164         *)
 165             echo "test_cgrp2_tc [debug] [cleanup-only | no-cleanup]"
 166             echo "  debug: Print cgrp and network setup details at the end of the test"
 167             echo "  cleanup-only: Try to cleanup things from last test.  No test will be run"
 168             echo "  no-cleanup: Run the test but don't do cleanup at the end"
 169             echo "[Note: If no arg is given, it will run the test and do cleanup at the end]"
 170             echo
 171             exit -1
 172             ;;
 173     esac
 174 done
 175
 176 trap do_exit 0
 177
 178 [ "$MODE" == 'cleanuponly' ] && exit
 179
 180 setup_cgrp2 start || exit $?
 181 setup_net start || exit $?
 182 init_bpf_fs_vars || exit $?
 183 setup_bpf_cgrp2_array start || exit $?
 184 do_test
 185 echo