FreeBSD Device Drivers

Network Interface Media Structures

An ifmedia structure catalogs every media type that is supported by a network interface (for example, 100BASE-TX, 1000BASE-SX, and so on). It is defined in the <net/if_media.h> header as follows:

struct ifmedia {
        int     ifm_mask;               /* Mask of bits to ignore.      */
        int     ifm_media;              /* User-set media word.         */
        struct ifmedia_entry *ifm_cur;  /* Currently selected media.    */

        /*
         * Linked list containing every media type supported by
         * an interface.
         */
        LIST_HEAD(, ifmedia_entry) ifm_list;

        ifm_change_cb_t ifm_change;     /* Media change callback.       */
        ifm_stat_cb_t   ifm_status;     /* Media status callback.       */
};