net: context: add net_context api to check if a port is bound

This change adds net_context_port_in_use(), which is a simple
wrapper around net_context_check_port() and is used to check
if a particular socket is bound to a given IP address.

Fixes #29649

Signed-off-by: Christopher Friedt <chrisfriedt@gmail.com>

include/net/net_context.h

@@ -1125,6 +1125,22 @@ static inline void net_context_setup_pools(struct net_context *context,
 #define net_context_setup_pools(context, tx_pool, data_pool)
 #endif
 
+/**
+ * @brief Check if a port is in use (bound)
+ *
+ * This function checks if a port is bound with respect to the specified
+ * @p ip_proto and @p local_addr.
+ *
+ * @param ip_proto the IP protocol
+ * @param local_port the port to check
+ * @param local_addr the network address
+ *
+ * @return true if the port is bound
+ * @return false if the port is not bound
+ */
+bool net_context_port_in_use(enum net_ip_protocol ip_proto,
+	uint16_t local_port, const struct sockaddr *local_addr);
+
 #ifdef __cplusplus
 }
 #endif

subsys/net/ip/net_context.c

@@ -122,6 +122,13 @@ static uint16_t find_available_port(struct net_context *context,
 #define find_available_port(...) 0
 #endif
 
+bool net_context_port_in_use(enum net_ip_protocol ip_proto,
+			   uint16_t local_port,
+			   const struct sockaddr *local_addr)
+{
+	return check_used_port(ip_proto, htons(local_port), local_addr) != 0;
+}
+
 int net_context_get(sa_family_t family,
 		    enum net_sock_type type,
 		    uint16_t ip_proto,