ws2_32: Move the setsockopt(IP_MULTICAST_IF) implementation to ntdll.

dlls/ntdll/unix/socket.c

@@ -1753,6 +1753,9 @@ NTSTATUS sock_ioctl( HANDLE handle, HANDLE event, PIO_APC_ROUTINE apc, void *apc
         case IOCTL_AFD_WINE_GET_IP_MULTICAST_IF:
             return do_getsockopt( handle, io, IPPROTO_IP, IP_MULTICAST_IF, out_buffer, out_size );
 
+        case IOCTL_AFD_WINE_SET_IP_MULTICAST_IF:
+            return do_setsockopt( handle, io, IPPROTO_IP, IP_MULTICAST_IF, in_buffer, in_size );
+
         default:
         {
             if ((code >> 16) == FILE_DEVICE_NETWORK)

dlls/ws2_32/socket.c

@@ -3648,6 +3648,9 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
         case WS_IP_HDRINCL:
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_IP_HDRINCL, optval, optlen );
 
+        case WS_IP_MULTICAST_IF:
+            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IP_MULTICAST_IF, optval, optlen );
+
         case WS_IP_UNBLOCK_SOURCE:
         {
             WS_IP_MREQ_SOURCE* val = (void*)optval;
@@ -3661,7 +3664,6 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
             convert_sockopt(&level, &optname);
             break;
         }
-        case WS_IP_MULTICAST_IF:
         case WS_IP_MULTICAST_LOOP:
         case WS_IP_MULTICAST_TTL:
         case WS_IP_OPTIONS:

include/wine/afd.h

@@ -191,6 +191,7 @@ struct afd_get_events_params
 #define IOCTL_AFD_WINE_GET_IP_HDRINCL                   WINE_AFD_IOC(246)
 #define IOCTL_AFD_WINE_SET_IP_HDRINCL                   WINE_AFD_IOC(247)
 #define IOCTL_AFD_WINE_GET_IP_MULTICAST_IF              WINE_AFD_IOC(248)
+#define IOCTL_AFD_WINE_SET_IP_MULTICAST_IF              WINE_AFD_IOC(249)
 
 struct afd_create_params
 {