VCAN_MAJOR_VERSION

Here is the definition:

#define VCAN_MAJOR_VERSION 1

This is the major version number of the vcan driver, which is the version number before the period, e.g. version 1.3 has a major version number of 1. Note that this version-number is defined in the driver’s header-file vcan.h, but in order to test whether the version of the currently used driver is the same you should use VCAN_IOCTL_VERSION function.