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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Test IPv6 force_forwarding interface property
#
# This test verifies that the force_forwarding property works correctly:
# - When global forwarding is disabled, packets are not forwarded normally
# - When force_forwarding is enabled on an interface, packets are forwarded
# regardless of the global forwarding setting
source lib.sh
cleanup() {
cleanup_ns $ns1 $ns2 $ns3
}
trap cleanup EXIT
setup_test() {
# Create three namespaces: sender, router, receiver
setup_ns ns1 ns2 ns3
# Create veth pairs: ns1 <-> ns2 <-> ns3
ip link add name veth12 type veth peer name veth21
ip link add name veth23 type veth peer name veth32
# Move interfaces to namespaces
ip link set veth12 netns $ns1
ip link set veth21 netns $ns2
ip link set veth23 netns $ns2
ip link set veth32 netns $ns3
# Configure interfaces
ip -n $ns1 addr add 2001:db8:1::1/64 dev veth12 nodad
ip -n $ns2 addr add 2001:db8:1::2/64 dev veth21 nodad
ip -n $ns2 addr add 2001:db8:2::1/64 dev veth23 nodad
ip -n $ns3 addr add 2001:db8:2::2/64 dev veth32 nodad
# Bring up interfaces
ip -n $ns1 link set veth12 up
ip -n $ns2 link set veth21 up
ip -n $ns2 link set veth23 up
ip -n $ns3 link set veth32 up
# Add routes
ip -n $ns1 route add 2001:db8:2::/64 via 2001:db8:1::2
ip -n $ns3 route add 2001:db8:1::/64 via 2001:db8:2::1
# Disable global forwarding
ip netns exec $ns2 sysctl -qw net.ipv6.conf.all.forwarding=0
}
test_force_forwarding() {
local ret=0
echo "TEST: force_forwarding functionality"
# Check if force_forwarding sysctl exists
if ! ip netns exec $ns2 test -f /proc/sys/net/ipv6/conf/veth21/force_forwarding; then
echo "SKIP: force_forwarding not available"
return $ksft_skip
fi
# Test 1: Without force_forwarding, ping should fail
ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth21.force_forwarding=0
ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth23.force_forwarding=0
if ip netns exec $ns1 ping -6 -c 1 -W 2 2001:db8:2::2 &>/dev/null; then
echo "FAIL: ping succeeded when forwarding disabled"
ret=1
else
echo "PASS: forwarding disabled correctly"
fi
# Test 2: With force_forwarding enabled, ping should succeed
ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth21.force_forwarding=1
ip netns exec $ns2 sysctl -qw net.ipv6.conf.veth23.force_forwarding=1
if ip netns exec $ns1 ping -6 -c 1 -W 2 2001:db8:2::2 &>/dev/null; then
echo "PASS: force_forwarding enabled forwarding"
else
echo "FAIL: ping failed with force_forwarding enabled"
ret=1
fi
return $ret
}
echo "IPv6 force_forwarding test"
echo "=========================="
setup_test
test_force_forwarding
ret=$?
if [ $ret -eq 0 ]; then
echo "OK"
exit 0
elif [ $ret -eq $ksft_skip ]; then
echo "SKIP"
exit $ksft_skip
else
echo "FAIL"
exit 1
fi
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