ws2_32: Move the setsockopt(IPV6_MULTICAST_IF) implementation to ntdll.

dlls/ntdll/unix/socket.c

@@ -1873,6 +1873,9 @@ NTSTATUS sock_ioctl( HANDLE handle, HANDLE event, PIO_APC_ROUTINE apc, void *apc
         case IOCTL_AFD_WINE_GET_IPV6_MULTICAST_IF:
             return do_getsockopt( handle, io, IPPROTO_IPV6, IPV6_MULTICAST_IF, out_buffer, out_size );
 
+        case IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF:
+            return do_setsockopt( handle, io, IPPROTO_IPV6, IPV6_MULTICAST_IF, in_buffer, in_size );
+
         default:
         {
             if ((code >> 16) == FILE_DEVICE_NETWORK)

dlls/ws2_32/socket.c

@@ -3633,6 +3633,8 @@ int WINAPI WS_setsockopt(SOCKET s, int level, int optname,
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_HOPS, optval, optlen );
 
         case WS_IPV6_MULTICAST_IF:
+            return server_setsockopt( s, IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF, optval, optlen );
+
         case WS_IPV6_MULTICAST_LOOP:
         case WS_IPV6_UNICAST_HOPS:
 #ifdef IPV6_UNICAST_IF

include/wine/afd.h

@@ -214,6 +214,7 @@ struct afd_get_events_params
 #define IOCTL_AFD_WINE_GET_IPV6_MULTICAST_HOPS          WINE_AFD_IOC(269)
 #define IOCTL_AFD_WINE_SET_IPV6_MULTICAST_HOPS          WINE_AFD_IOC(270)
 #define IOCTL_AFD_WINE_GET_IPV6_MULTICAST_IF            WINE_AFD_IOC(271)
+#define IOCTL_AFD_WINE_SET_IPV6_MULTICAST_IF            WINE_AFD_IOC(272)
 
 struct afd_create_params
 {