tests: net: ipv6: Add tests for verifying DAD timers

Make sure that DAD timers are triggered in proper order.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

Author: jukkar

tests/net/ipv6/prj.conf

@@ -21,8 +21,8 @@ CONFIG_NET_BUF_TX_COUNT=20
 CONFIG_NET_6LO=y
 CONFIG_NET_6LO_CONTEXT=y
 CONFIG_NET_MAX_ROUTERS=2
-CONFIG_NET_IF_UNICAST_IPV6_ADDR_COUNT=4
-CONFIG_NET_IF_MCAST_IPV6_ADDR_COUNT=5
+CONFIG_NET_IF_UNICAST_IPV6_ADDR_COUNT=7
+CONFIG_NET_IF_MCAST_IPV6_ADDR_COUNT=7
 CONFIG_NET_IF_IPV6_PREFIX_COUNT=3
 CONFIG_SYS_LOG_NET_LEVEL=2
 #CONFIG_NET_DEBUG_IF=y

tests/net/ipv6/src/main.c

@@ -116,6 +116,8 @@ static const unsigned char ipv6_hbho[] = {
 };
 
 static bool expecting_ra;
+static bool expecting_dad;
+static u32_t dad_time[3];
 static bool test_failed;
 static struct k_sem wait_data;
 
@@ -229,6 +231,22 @@ static int tester_send(struct net_if *iface, struct net_pkt *pkt)
 		}
 	}
 
+	if (icmp->type == NET_ICMPV6_NS) {
+		if (expecting_dad) {
+			net_pkt_unref(pkt);
+
+			if (dad_time[0] == 0) {
+				dad_time[0] = k_uptime_get_32();
+			} else if (dad_time[1] == 0) {
+				dad_time[1] = k_uptime_get_32();
+			} else if (dad_time[2] == 0) {
+				dad_time[2] = k_uptime_get_32();
+			}
+
+			goto out;
+		}
+	}
+
 	/* Feed this data back to us */
 	if (net_recv_data(iface, pkt) < 0) {
 		TC_ERROR("Data receive failed.");
@@ -980,6 +998,49 @@ static void test_change_ll_addr(void)
 		     "Wrong link address 2");
 }
 
+static void test_dad_timeout(void)
+{
+#if defined(CONFIG_NET_IPV6_DAD)
+	struct in6_addr addr1 = { { { 0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0x99, 0x1 } } };
+	struct in6_addr addr2 = { { { 0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0x99, 0x2 } } };
+	struct in6_addr addr3 = { { { 0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0,
+				      0, 0, 0, 0, 0, 0, 0x99, 0x3 } } };
+	struct net_if *iface = net_if_get_default();
+
+	struct net_if_addr *ifaddr;
+
+	expecting_dad = true;
+
+	ifaddr = net_if_ipv6_addr_add(iface, &addr1, NET_ADDR_AUTOCONF, 0xffff);
+	zassert_not_null(ifaddr, "Address 1 cannot be added");
+
+	k_sleep(K_MSEC(10));
+
+	ifaddr = net_if_ipv6_addr_add(iface, &addr2, NET_ADDR_AUTOCONF, 0xffff);
+	zassert_not_null(ifaddr, "Address 2 cannot be added");
+
+	k_sleep(K_MSEC(10));
+
+	ifaddr = net_if_ipv6_addr_add(iface, &addr3, NET_ADDR_AUTOCONF, 0xffff);
+	zassert_not_null(ifaddr, "Address 3 cannot be added");
+
+	k_sleep(K_MSEC(200));
+
+	/* We should have received three DAD queries, make sure they are in
+	 * proper order.
+	 */
+	zassert_true(dad_time[0] < dad_time[1], "DAD timer 1+2 failure");
+	zassert_true(dad_time[1] < dad_time[2], "DAD timer 2+3 failure");
+	zassert_true((dad_time[2] - dad_time[0]) < 100,
+		     "DAD timers took too long time [%u] [%u] [%u]",
+		     dad_time[0], dad_time[1], dad_time[2]);
+
+	expecting_dad = false;
+#endif
+}
+
 void test_main(void)
 {
 	ztest_test_suite(test_ipv6_fn,
@@ -997,7 +1058,8 @@ void test_main(void)
 			 ztest_unit_test(test_hbho_message_2),
 			 ztest_unit_test(test_hbho_message_3),
 			 ztest_unit_test(test_change_ll_addr),
-			 ztest_unit_test(test_prefix_timeout)
+			 ztest_unit_test(test_prefix_timeout),
+			 ztest_unit_test(test_dad_timeout)
 			 );
 	ztest_run_test_suite(test_ipv6_fn);
 }