linux/tools/testing/selftests/net/forwarding/mirror_lib.sh

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# SPDX-License-Identifier: GPL-2.0
mirror_install()
{
local from_dev=$1; shift
local direction=$1; shift
local to_dev=$1; shift
local filter=$1; shift
tc filter add dev $from_dev $direction \
pref 1000 $filter \
action mirred egress mirror dev $to_dev
}
mirror_uninstall()
{
local from_dev=$1; shift
local direction=$1; shift
tc filter del dev $swp1 $direction pref 1000
}
mirror_test()
{
local vrf_name=$1; shift
local sip=$1; shift
local dip=$1; shift
local dev=$1; shift
local pref=$1; shift
local expect=$1; shift
local t0=$(tc_rule_stats_get $dev $pref)
ip vrf exec $vrf_name \
${PING} ${sip:+-I $sip} $dip -c 10 -i 0.1 -w 2 &> /dev/null
local t1=$(tc_rule_stats_get $dev $pref)
local delta=$((t1 - t0))
# Tolerate a couple stray extra packets.
((expect <= delta && delta <= expect + 2))
check_err $? "Expected to capture $expect packets, got $delta."
}