r0 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_SIOCDELRT(r0, 0x890c, &(0x7f00000001c0)={0x0, @l2tp={0x2, 0x0, @dev}, @l2tp={0x2, 0x0, @broadcast}, @nl=@unspec})