tests: net: udp: Add IPv6 unicast hop limit tests

Make sure that setting IPv6 unicast hop limit works as expected.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

tests/net/socket/udp/src/main.c

@@ -2132,6 +2132,56 @@ ZTEST(net_socket_udp, test_33_v6_mcast_hops)
 		       AF_INET6, 0, mcast_hops);
 }
 
+ZTEST(net_socket_udp, test_34_v6_hops)
+{
+	int ret;
+	int client_sock;
+	int server_sock;
+	int packet_sock;
+	int hops, verify;
+	socklen_t optlen;
+	struct sockaddr_in6 client_addr;
+	struct sockaddr_in6 server_addr;
+
+	Z_TEST_SKIP_IFNDEF(CONFIG_NET_SOCKETS_PACKET);
+
+	prepare_sock_udp_v6(MY_IPV6_ADDR, CLIENT_PORT, &client_sock, &client_addr);
+	prepare_sock_udp_v6(MY_IPV6_ADDR, SERVER_PORT, &server_sock, &server_addr);
+
+	packet_sock = socket(AF_PACKET, SOCK_RAW, ETH_P_ALL);
+	zassert_true(packet_sock >= 0, "Cannot create packet socket (%d)", -errno);
+
+	ret = bind_socket(packet_sock, lo0);
+	zassert_equal(ret, 0, "packet socket bind failed");
+
+	zassert_not_null(lo0->config.ip.ipv6,
+			 "Interface %d (%p) no IPv6 configured",
+			 net_if_get_by_iface(lo0), lo0);
+
+	hops = 16;
+	net_if_ipv6_set_hop_limit(lo0, hops);
+	verify = net_if_ipv6_get_hop_limit(lo0);
+	zassert_equal(verify, hops, "Different hop limit (%d vs %d)", hops, verify);
+
+	hops = 8;
+	ret = setsockopt(client_sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &hops,
+			sizeof(hops));
+	zassert_equal(ret, 0, "Cannot set unicast hops (%d)", -errno);
+
+	optlen = sizeof(verify);
+	ret = getsockopt(client_sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &verify,
+			 &optlen);
+	zassert_equal(ret, 0, "Cannot get unicast hops (%d)", -errno);
+	zassert_equal(verify, hops, "Different unicast hops (%d vs %d)",
+		      hops, verify);
+
+	test_check_ttl(client_sock, server_sock, packet_sock,
+		       (struct sockaddr *)&client_addr, sizeof(client_addr),
+		       (struct sockaddr *)&server_addr, sizeof(server_addr),
+		       (struct sockaddr *)&server_addr, sizeof(server_addr),
+		       AF_INET6, hops, 0);
+}
+
 static void after(void *arg)
 {
 	ARG_UNUSED(arg);