/*
<:copyright-BRCM:2016:DUAL/GPL:standard

   Broadcom Proprietary and Confidential.(c) 2016 Broadcom
   All Rights Reserved

Unless you and Broadcom execute a separate written software license
agreement governing use of this software, this software is licensed
to you under the terms of the GNU General Public License version 2
(the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php,
with the following added to such license:

   As a special exception, the copyright holders of this software give
   you permission to link this software with independent modules, and
   to copy and distribute the resulting executable under terms of your
   choice, provided that you also meet, for each linked independent
   module, the terms and conditions of the license of that module.
   An independent module is a module which is not derived from this
   software.  The special exception does not apply to any modifications
   of the software.

Not withstanding the above, under no circumstances may you combine
this software in any way with any other Broadcom software provided
under a license other than the GPL, without Broadcom's express prior
written consent.

:>
 */

#if !defined(MKA_H)
#define MKA_H

#include "bcmos_system.h"
#include "bcmolt_model_types.h"

#define MKA_LIFE_TIME               6000 /* Ms, 6 seconds */

#define MKA_SCI_LEN                 8 /* common SCI size */
#define MKA_MI_LEN                  12 /* Member Identifier */

/* KEK */
#define MKA_KEK_LEN                 128 /* bit length. 16 bytes */

/* SAK */
#define MKA_SAK_LEN                 16

/* ICK */
#define MKA_ICK_LEN                 128 /* bit length. 16 bytes */

/* CKN */
#define MKA_CKN_LEN                 128 /* bit length. 16 bytes */

/* CAK */
#define MKA_CAK_LEN                 128 /* bit length. 16 bytes */

/* for MACSec Key Agreement */
typedef enum
{
    MKA_STATE_INITIAL                   = 0,
    MKA_STATE_WAITING_INITIAL_PEER_RESP = 1,
    MKA_STATE_SAK_SENT                  = 2,
    MKA_STATE_MKA_DONE                  = 3,

    MKA_STATE__COUNT
} mka_state;

typedef enum
{
    MKA_PEER_STATE_NONE = 0,
    MKA_PEER_STATE_LIVE = 1,
    MKA_PEER_STATE_POTENTIAL = 2,
} mka_peer_state;

typedef struct
{
    uint8_t  onu_sci[MKA_SCI_LEN]; /**< ONU's SCI */
    uint8_t  olt_member_id[MKA_MI_LEN]; /**< OLT MI */
    uint32_t curr_msg_num; /**< Current OLT MN */
    uint8_t  link_memeber_id[MKA_MI_LEN]; /**< Link MI */
    uint32_t link_msg_num; /**< Current Link MN */
    uint8_t  cak[MKA_CAK_LEN/8]; /**< Derived CAK */
    uint8_t  ckn[MKA_CKN_LEN/8]; /**< Derived CKN */
    uint8_t  sak[MKA_SAK_LEN]; /**< Derived SAK (a.k.a TEK) */
    uint8_t  new_sak[MKA_SAK_LEN]; /**< New derived SAK for key refresh */
    uint8_t  kek[MKA_KEK_LEN/8]; /**< Derived KEK */
    uint8_t  ick[MKA_ICK_LEN/8]; /**< Derived ICK */
    uint32_t key_number; /**< Current KN */
    uint8_t  association_number; /**< AN */
    bcmos_mac_address lesser_mac; /**< Lowest MAC address of MKA peers */
    bcmos_mac_address greater_mac; /**< Greatest MAC address of MKA peers */
    mka_state state; /**< State of MKA proper SM */
    mka_peer_state peer_state; /**< State of MKA peer */
    uint8_t  retry_cnt; /**< MKA message retry count */
    uint8_t  refresh_cnt; /**< Important for building SAK Use Param set */
    bcmos_bool sak_refresh_needed; /**< SAK refresh needed flag */
} mka_link_info;

/* The type of MKA operation to process. */
typedef enum mka_op_type
{
    MKA_OP__INVALID = -1,

    /* Packet operations. */
    MKA_OP_START_RSP,
    MKA_OP_SAK_RSP,
    MKA_OP_KEEP_ALIVE,

    /* Timeout operations. */
    MKA_OP_START_TIMEOUT,
    MKA_OP_SAK_TIMEOUT,
    MKA_OP_SEND_KEEP_ALIVE,

    MKA_OP__COUNT
} mka_op_type;

struct dpoe_sec_link_rec;

bcmos_errno mka_start(struct dpoe_sec_link_rec *link);

void mka_generate_sak(struct dpoe_sec_link_rec *link, bcmos_bool initial);

bcmos_errno mka_send_sak(struct dpoe_sec_link_rec *link, uint8_t *sak);

bcmos_errno mka_send_sak_confirm(struct dpoe_sec_link_rec *link);

bcmos_errno mka_process_packet(struct dpoe_sec_link_rec *link, bcmolt_u8_list_u16 rx_frame, mka_op_type op_type);

bcmos_errno mka_process_timeout(struct dpoe_sec_link_rec *link, mka_op_type op_type);

#endif /* MKA_H */