selftests: fib_tests: add temporary IPv6 address renewal test

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>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260523103811.3790-2-fmancera@suse.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index af64f93bb2e1f18d6f16ed5e52b114a1a5bac611..8f10de0eb98539a83d1df132fec4e40d03a91759 100755 (executable)
--- 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 +1611,62 @@ 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 3
+
+       # Deprecate it
+       $NS_EXEC ra6 -i veth2 -s fe80::1 -d ff02::1 -P 2001:12::/64\#LA\#3600\#0 -e
+       sleep 3
+
+       # 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"
+
+       set +e
+
+       cleanup &> /dev/null
+}
+
 # add route for a prefix, flushing any existing routes first
 # expected to be the first step of a test
 add_route()
@@ -3002,6 +3058,7 @@ 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