#!/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
# 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
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