1 /* 2 * EAPOL definitions shared between hostapd and wpa_supplicant 3 * Copyright (c) 2002-2007, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef EAPOL_COMMON_H 10 #define EAPOL_COMMON_H 11 12 /* IEEE Std 802.1X-2004 */ 13 14 #ifdef _MSC_VER 15 #pragma pack(push, 1) 16 #endif /* _MSC_VER */ 17 18 struct ieee802_1x_hdr { 19 u8 version; 20 u8 type; 21 be16 length; 22 /* followed by length octets of data */ 23 } STRUCT_PACKED; 24 25 #ifdef _MSC_VER 26 #pragma pack(pop) 27 #endif /* _MSC_VER */ 28 29 #define EAPOL_VERSION 2 30 31 enum { IEEE802_1X_TYPE_EAP_PACKET = 0, 32 IEEE802_1X_TYPE_EAPOL_START = 1, 33 IEEE802_1X_TYPE_EAPOL_LOGOFF = 2, 34 IEEE802_1X_TYPE_EAPOL_KEY = 3, 35 IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT = 4 36 }; 37 38 enum { EAPOL_KEY_TYPE_RC4 = 1, EAPOL_KEY_TYPE_RSN = 2, 39 EAPOL_KEY_TYPE_WPA = 254 }; 40 41 42 #define IEEE8021X_REPLAY_COUNTER_LEN 8 43 #define IEEE8021X_KEY_SIGN_LEN 16 44 #define IEEE8021X_KEY_IV_LEN 16 45 46 #define IEEE8021X_KEY_INDEX_FLAG 0x80 47 #define IEEE8021X_KEY_INDEX_MASK 0x03 48 49 #ifdef _MSC_VER 50 #pragma pack(push, 1) 51 #endif /* _MSC_VER */ 52 53 struct ieee802_1x_eapol_key { 54 u8 type; 55 /* Note: key_length is unaligned */ 56 u8 key_length[2]; 57 /* does not repeat within the life of the keying material used to 58 * encrypt the Key field; 64-bit NTP timestamp MAY be used here */ 59 u8 replay_counter[IEEE8021X_REPLAY_COUNTER_LEN]; 60 u8 key_iv[IEEE8021X_KEY_IV_LEN]; /* cryptographically random number */ 61 u8 key_index; /* key flag in the most significant bit: 62 * 0 = broadcast (default key), 63 * 1 = unicast (key mapping key); key index is in the 64 * 7 least significant bits */ 65 /* HMAC-MD5 message integrity check computed with MS-MPPE-Send-Key as 66 * the key */ 67 u8 key_signature[IEEE8021X_KEY_SIGN_LEN]; 68 69 /* followed by key: if packet body length = 44 + key length, then the 70 * key field (of key_length bytes) contains the key in encrypted form; 71 * if packet body length = 44, key field is absent and key_length 72 * represents the number of least significant octets from 73 * MS-MPPE-Send-Key attribute to be used as the keying material; 74 * RC4 key used in encryption = Key-IV + MS-MPPE-Recv-Key */ 75 } STRUCT_PACKED; 76 77 #ifdef _MSC_VER 78 #pragma pack(pop) 79 #endif /* _MSC_VER */ 80 81 #endif /* EAPOL_COMMON_H */ 82
