test: net: offloaded_netdev: Add tests for IPv4/6 address registration

Make sure it's possible to register IPv4/6 addresses on an offloaded
interface. Add an extra build configuration to make sure it's also
possible when native IP stack is disabled.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

tests/net/offloaded_netdev/prj.conf

@@ -7,3 +7,9 @@ CONFIG_ZTEST=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_NET_OFFLOAD=y
 CONFIG_TEST_RANDOM_GENERATOR=y
+CONFIG_NET_IPV4=y
+CONFIG_NET_IPV6=y
+CONFIG_NET_IPV6_NBR_CACHE=n
+CONFIG_NET_IPV6_MLD=n
+CONFIG_NET_IF_MAX_IPV4_COUNT=4
+CONFIG_NET_IF_MAX_IPV6_COUNT=4

tests/net/offloaded_netdev/src/main.c

@@ -19,6 +19,11 @@
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/net_l2.h>
 
+static struct in_addr test_addr_ipv4 = { { { 192, 0, 2, 1 } } };
+static struct in6_addr test_addr_ipv6 = { { {
+	0x20, 0x01, 0x0d, 0xb8, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x1
+} } };
+
 /* Dummy socket creator for socket-offloaded ifaces */
 int offload_socket(int family, int type, int proto)
 {
@@ -36,6 +41,8 @@ static void sock_offload_l2_iface_init(struct net_if *iface)
 	 */
 	net_if_socket_offload_set(iface, offload_socket);
 	net_if_flag_set(iface, NET_IF_NO_AUTO_START);
+	net_if_flag_set(iface, NET_IF_IPV4);
+	net_if_flag_set(iface, NET_IF_IPV6);
 }
 
 /* Dummy init function for net-offloaded ifaces */
@@ -46,6 +53,8 @@ static void net_offload_l2_iface_init(struct net_if *iface)
 	 */
 	iface->if_dev->offload = &net_offload_api;
 	net_if_flag_set(iface, NET_IF_NO_AUTO_START);
+	net_if_flag_set(iface, NET_IF_IPV4);
+	net_if_flag_set(iface, NET_IF_IPV6);
 }
 
 /* Tracks the total number of ifaces that are up (theoretically). */
@@ -327,5 +336,58 @@ ZTEST(net_offloaded_netdev, test_up_down_sock_off_impl_fail_down)
 			"Iface under test should have failed to go up");
 }
 
+static void test_addr_add_common(struct net_if *test_iface, const char *off_type)
+{
+	struct net_if *lookup_iface;
+	struct net_if_addr *ipv4_addr;
+	struct net_if_addr *ipv6_addr;
+
+	/* Bring iface up before test */
+	(void)net_if_up(test_iface);
+
+	ipv4_addr = net_if_ipv4_addr_add(test_iface, &test_addr_ipv4,
+					 NET_ADDR_MANUAL, 0);
+	zassert_not_null(ipv4_addr,
+			"Failed to add IPv4 address to a %s offloaded interface",
+			off_type);
+	ipv6_addr = net_if_ipv6_addr_add(test_iface, &test_addr_ipv6,
+					 NET_ADDR_MANUAL, 0);
+	zassert_not_null(ipv6_addr,
+			 "Failed to add IPv6 address to a socket %s interface",
+			 off_type);
+
+	lookup_iface = NULL;
+	zassert_equal_ptr(net_if_ipv4_addr_lookup(&test_addr_ipv4, &lookup_iface),
+			  ipv4_addr,
+			  "Failed to find IPv4 address on a %s offloaded interface");
+	zassert_equal_ptr(lookup_iface, test_iface, "Wrong interface");
+
+	lookup_iface = NULL;
+	zassert_equal_ptr(net_if_ipv6_addr_lookup(&test_addr_ipv6, &lookup_iface),
+			  ipv6_addr,
+			  "Failed to find IPv6 address on a %s offloaded interface");
+	zassert_equal_ptr(lookup_iface, test_iface, "Wrong interface");
+
+	zassert_true(net_if_ipv4_addr_rm(test_iface, &test_addr_ipv4),
+		     "Failed to remove IPv4 address from a %s offloaded interface",
+		     off_type);
+	zassert_true(net_if_ipv6_addr_rm(test_iface, &test_addr_ipv6),
+		     "Failed to remove IPv4 address from a %s offloaded interface",
+		     off_type);
+}
+
+ZTEST(net_offloaded_netdev, test_addr_add_sock_off_impl)
+{
+	struct net_if *test_iface = NET_IF_GET(sock_offload_test_impl, 0);
+
+	test_addr_add_common(test_iface, "offloaded");
+}
+
+ZTEST(net_offloaded_netdev, test_addr_add_net_off_impl)
+{
+	struct net_if *test_iface = NET_IF_GET(net_offload_test_impl, 0);
+
+	test_addr_add_common(test_iface, "net");
+}
 
 ZTEST_SUITE(net_offloaded_netdev, NULL, NULL, net_offloaded_netdev_before, NULL, NULL);

tests/net/offloaded_netdev/testcase.yaml

@@ -1,9 +1,12 @@
 common:
   min_ram: 16
   depends_on: netif
+  tags:
+    - net
+    - iface
+    - userspace
 tests:
-  net.offloaded_netdev:
-    tags:
-      - net
-      - iface
-      - userspace
+  net.offloaded_netdev: {}
+  net.offloaded_netdev.no_native:
+    extra_configs:
+      - CONFIG_NET_NATIVE=n