netconn: Create API macros to get/set IPV6ONLY flag

src/api/api_msg.c

@@ -1087,7 +1087,7 @@ lwip_netconn_do_bind(struct api_msg_msg *msg)
        * and NETCONN_FLAG_IPV6_V6ONLY is NOT set, use IP_ANY_TYPE to bind
        */
       if (ip_addr_cmp(ipaddr, IP6_ADDR_ANY) &&
-          ((msg->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) == 0)) {
+          (netconn_get_ipv6only(msg->conn) == 0)) {
         /* change PCB type to IPADDR_TYPE_ANY */
         IP_SET_TYPE_VAL(msg->conn->pcb.ip->local_ip,  IPADDR_TYPE_ANY);
         IP_SET_TYPE_VAL(msg->conn->pcb.ip->remote_ip, IPADDR_TYPE_ANY);
@@ -1289,7 +1289,7 @@ lwip_netconn_do_listen(struct api_msg_msg *msg)
              * and NETCONN_FLAG_IPV6_V6ONLY is NOT set, use IP_ANY_TYPE to listen
              */
             if (ip_addr_cmp(&msg->conn->pcb.ip->local_ip, IP6_ADDR_ANY) &&
-                ((msg->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) == 0)) {
+                (netconn_get_ipv6only(msg->conn) == 0)) {
               /* change PCB type to IPADDR_TYPE_ANY */
               IP_SET_TYPE_VAL(msg->conn->pcb.tcp->local_ip,  IPADDR_TYPE_ANY);
               IP_SET_TYPE_VAL(msg->conn->pcb.tcp->remote_ip, IPADDR_TYPE_ANY);

src/api/sockets.c

@@ -2110,7 +2110,7 @@ lwip_getsockopt_impl(int s, int level, int optname, void *optval, socklen_t *opt
       if (NETCONNTYPE_GROUP(netconn_type(sock->conn)) != NETCONN_TCP) {
         return ENOPROTOOPT;
       }
-      *(int*)optval = ((sock->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) ? 1 : 0);
+      *(int*)optval = (netconn_get_ipv6only(sock->conn) ? 1 : 0);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IPV6, IPV6_V6ONLY) = %d\n",
                   s, *(int *)optval));
       break;
@@ -2505,12 +2505,12 @@ lwip_setsockopt_impl(int s, int level, int optname, const void *optval, socklen_
       /* @todo: this does not work for datagram sockets, yet */
       LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, int, NETCONN_TCP);
       if (*(const int*)optval) {
-        sock->conn->flags |= NETCONN_FLAG_IPV6_V6ONLY;
+        netconn_set_ipv6only(sock->conn, 1);
       } else {
-        sock->conn->flags &= ~NETCONN_FLAG_IPV6_V6ONLY;
+        netconn_set_ipv6only(sock->conn, 0);
       }
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IPV6, IPV6_V6ONLY, ..) -> %d\n",
-                  s, ((sock->conn->flags & NETCONN_FLAG_IPV6_V6ONLY) ? 1 : 0)));
+                  s, (netconn_get_ipv6only(sock->conn) ? 1 : 0)));
       break;
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IPV6, UNIMPL: optname=0x%x, ..)\n",

src/include/lwip/api.h

@@ -315,6 +315,16 @@ err_t   netconn_gethostbyname(const char *name, ip_addr_t *addr);
 /** TCP: Get the no-auto-recved status of netconn calls (see NETCONN_FLAG_NO_AUTO_RECVED) */
 #define netconn_get_noautorecved(conn)        (((conn)->flags & NETCONN_FLAG_NO_AUTO_RECVED) != 0)
 
+#if LWIP_IPV6
+/** TCP: Set the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY) */
+#define netconn_set_ipv6only(conn, val)  do { if(val) { \
+  (conn)->flags |= NETCONN_FLAG_IPV6_V6ONLY; \
+} else { \
+  (conn)->flags &= ~ NETCONN_FLAG_IPV6_V6ONLY; }} while(0)
+/** TCP: Get the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY) */
+#define netconn_get_ipv6only(conn)        (((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0)
+#endif /* LWIP_IPV6 */
+
 #if LWIP_SO_SNDTIMEO
 /** Set the send timeout in milliseconds */
 #define netconn_set_sendtimeout(conn, timeout)      ((conn)->send_timeout = (timeout))