eapol_common.h

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#ifndef EAPOL_COMMON_H
#define EAPOL_COMMON_H

/* IEEE Std 802.1X-2004 */

#ifdef _MSC_VER
#pragma pack(push, 1)
#endif /* _MSC_VER */

struct ieee802_1x_hdr {
        u8 version;
        u8 type;
        be16 length;
        /* followed by length octets of data */
} STRUCT_PACKED;

struct ieee8023_hdr {
        u8 dest[ETH_ALEN];
        u8 src[ETH_ALEN];
        u16 ethertype;
} STRUCT_PACKED;

#ifdef _MSC_VER
#pragma pack(pop)
#endif /* _MSC_VER */

#ifdef CONFIG_MACSEC
#define EAPOL_VERSION 3
#else /* CONFIG_MACSEC */
#define EAPOL_VERSION 2
#endif /* CONFIG_MACSEC */

enum { IEEE802_1X_TYPE_EAP_PACKET = 0,
       IEEE802_1X_TYPE_EAPOL_START = 1,
       IEEE802_1X_TYPE_EAPOL_LOGOFF = 2,
       IEEE802_1X_TYPE_EAPOL_KEY = 3,
       IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT = 4,
       IEEE802_1X_TYPE_EAPOL_MKA = 5,
};

enum { EAPOL_KEY_TYPE_RC4 = 1, EAPOL_KEY_TYPE_RSN = 2,
       EAPOL_KEY_TYPE_WPA = 254 };


#define IEEE8021X_REPLAY_COUNTER_LEN 8
#define IEEE8021X_KEY_SIGN_LEN 16
#define IEEE8021X_KEY_IV_LEN 16

#define IEEE8021X_KEY_INDEX_FLAG 0x80
#define IEEE8021X_KEY_INDEX_MASK 0x03

#ifdef _MSC_VER
#pragma pack(push, 1)
#endif /* _MSC_VER */

struct ieee802_1x_eapol_key {
        u8 type;
        /* Note: key_length is unaligned */
        u8 key_length[2];
        /* does not repeat within the life of the keying material used to
         * encrypt the Key field; 64-bit NTP timestamp MAY be used here */
        u8 replay_counter[IEEE8021X_REPLAY_COUNTER_LEN];
        u8 key_iv[IEEE8021X_KEY_IV_LEN]; /* cryptographically random number */
        u8 key_index; /* key flag in the most significant bit:
                       * 0 = broadcast (default key),
                       * 1 = unicast (key mapping key); key index is in the
                       * 7 least significant bits */
        /* HMAC-MD5 message integrity check computed with MS-MPPE-Send-Key as
         * the key */
        u8 key_signature[IEEE8021X_KEY_SIGN_LEN];

        /* followed by key: if packet body length = 44 + key length, then the
         * key field (of key_length bytes) contains the key in encrypted form;
         * if packet body length = 44, key field is absent and key_length
         * represents the number of least significant octets from
         * MS-MPPE-Send-Key attribute to be used as the keying material;
         * RC4 key used in encryption = Key-IV + MS-MPPE-Recv-Key */
} STRUCT_PACKED;

#ifdef _MSC_VER
#pragma pack(pop)
#endif /* _MSC_VER */

#endif /* EAPOL_COMMON_H */