[PATCH 2/2 net] selftests: fib_tests: add temporary IPv6 address renewal test

Fernando Fernandez Mancera
2026-05-03T22:12:56Z

Add a test to check that temporary IPv6 address is regenerated properly
after the base prefix is deprecated and restored.

Fib6 temporary address renewal test
TEST: IPv6 temporary address cleanly deprecated and regenerated [ OK ]

Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>
---
tools/testing/selftests/net/fib_tests.sh | 55 +++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index af64f93bb2e1..6a6e545cb40d 100755
--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -12,7 +12,7 @@ TESTS="unregister down carrier nexthop suppress ipv6_notify ipv4_notify \
ipv4_route_metrics ipv4_route_v6_gw rp_filter ipv4_del_addr \
ipv6_del_addr ipv4_mangle ipv6_mangle ipv4_bcast_neigh fib6_gc_test \
ipv4_mpath_list ipv6_mpath_list ipv4_mpath_balance ipv6_mpath_balance \
- ipv4_mpath_balance_preferred fib6_ra_to_static"
+ ipv4_mpath_balance_preferred fib6_ra_to_static fib6_temp_addr_renewal"

VERBOSE=0
PAUSE_ON_FAIL=no
@@ -1611,6 +1611,58 @@ fib6_ra_to_static()
cleanup &> /dev/null
}

+fib6_temp_addr_renewal() {
+ setup
+
+ echo
+ echo "Fib6 temporary address renewal test"
+ set -e
+
+ # ra6 is required for the test. (ipv6toolkit)
+ if [ ! -x "$(command -v ra6)" ]; then
+ echo "SKIP: ra6 not found."
+ set +e
+ cleanup &> /dev/null
+ return
+ fi
+
+ # Create a pair of veth devices to send a RA message from one
+ # device to another.
+ $IP link add veth1 type veth peer name veth2
+ $IP link set dev veth1 up
+ $IP link set dev veth2 up
+
+ # Make veth1 ready to receive RA messages.
+ $NS_EXEC sysctl -wq net.ipv6.conf.veth1.accept_ra=2
+ $NS_EXEC sysctl -wq net.ipv6.conf.veth1.use_tempaddr=2
+ $NS_EXEC sysctl -wq net.ipv6.conf.veth1.temp_prefered_lft=15
+ $NS_EXEC sysctl -wq net.ipv6.conf.veth1.max_desync_factor=0
+
+ # Send a RA message with a prefix from veth2.
+ $NS_EXEC ra6 -i veth2 -s fe80::1 -d ff02::1 -P 2001:12::/64\#LA\#3600\#3600 -e
+ sleep 2
+
+ # Deprecate it
+ $NS_EXEC ra6 -i veth2 -s fe80::1 -d ff02::1 -P 2001:12::/64\#LA\#3600\#0 -e
+ sleep 2
+
+ # Restore it
+ $NS_EXEC ra6 -i veth2 -s fe80::1 -d ff02::1 -P 2001:12::/64\#LA\#3600\#3600 -e
+
+ ret=1
+ for i in $(seq 1 25); do
+ sleep 1
+ num_dep="$($IP -6 addr | grep -c "temporary deprecated" || true)"
+ num_tot="$($IP -6 addr | grep -c "temporary" || true)"
+
+ if [ "$num_dep" -eq 1 ] && [ "$num_tot" -ge 2 ]; then
+ ret=0
+ break
+ fi
+ done
+ log_test "$ret" 0 "IPv6 temporary address cleanly deprecated and regenerated"
+}
+
# add route for a prefix, flushing any existing routes first
# expected to be the first step of a test
add_route()
@@ -3002,6 +3054,7 @@ do
ipv6_mpath_balance) ipv6_mpath_balance_test;;
ipv4_mpath_balance_preferred) ipv4_mpath_balance_preferred_test;;
fib6_ra_to_static) fib6_ra_to_static;;
+ fib6_temp_addr_renewal) fib6_temp_addr_renewal;;

help) echo "Test names: $TESTS"; exit 0;;
esac
--
2.53.0