net: Network interface sets default IPv6 hop limit

A default hop limit can be configured via Kconfig.

Change-Id: I5cbd130882e043e24488c4501e86fce0f91d48df
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

net/yaip/Kconfig

@@ -45,6 +45,13 @@ config NET_IFACE_IPV6_PREFIX_COUNT
        depends on NET_IPV6
        default 2
 
+config NET_INITIAL_HOP_LIMIT
+       int "Initial hop limit for a connection"
+       depends on NET_IPV6
+       default 64
+       help
+         The value should be > 0
+
 config NET_IPV4
        bool "Enable IPv4"
        default n

net/yaip/net_if.c

@@ -422,6 +422,10 @@ int net_if_init(void)
 			api->init(iface);
 			init_tx_queue(iface);
 		}
+
+#if defined(CONFIG_NET_IPV6)
+		iface->hop_limit = CONFIG_NET_INITIAL_HOP_LIMIT;
+#endif
 	}
 
 	return 0;