/*
 * hostapd - IEEE 802.11i-2004 / WPA Authenticator
 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#ifndef WPA_AUTH_H
#define WPA_AUTH_H

#include "common/defs.h"
#include "common/eapol_common.h"
#include "common/wpa_common.h"

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

/* IEEE Std 802.11r-2008, 11A.10.3 - Remote request/response frame definition
 */
struct ft_rrb_frame {
	u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
	u8 packet_type; /* FT_PACKET_REQUEST/FT_PACKET_RESPONSE */
	le16 action_length; /* little endian length of action_frame */
	u8 ap_address[ETH_ALEN];
	/*
	 * Followed by action_length bytes of FT Action frame (from Category
	 * field to the end of Action Frame body.
	 */
} STRUCT_PACKED;

#define RSN_REMOTE_FRAME_TYPE_FT_RRB 1

#define FT_PACKET_REQUEST 0
#define FT_PACKET_RESPONSE 1
/* Vendor-specific types for R0KH-R1KH protocol; not defined in 802.11r */
#define FT_PACKET_R0KH_R1KH_PULL 200
#define FT_PACKET_R0KH_R1KH_RESP 201
#define FT_PACKET_R0KH_R1KH_PUSH 202

#define FT_R0KH_R1KH_PULL_DATA_LEN 44
#define FT_R0KH_R1KH_RESP_DATA_LEN 76
#define FT_R0KH_R1KH_PUSH_DATA_LEN 88

struct ft_r0kh_r1kh_pull_frame {
	u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
	u8 packet_type; /* FT_PACKET_R0KH_R1KH_PULL */
	le16 data_length; /* little endian length of data (44) */
	u8 ap_address[ETH_ALEN];

	u8 nonce[16];
	u8 pmk_r0_name[WPA_PMK_NAME_LEN];
	u8 r1kh_id[FT_R1KH_ID_LEN];
	u8 s1kh_id[ETH_ALEN];
	u8 pad[4]; /* 8-octet boundary for AES key wrap */
	u8 key_wrap_extra[8];
} STRUCT_PACKED;

struct ft_r0kh_r1kh_resp_frame {
	u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
	u8 packet_type; /* FT_PACKET_R0KH_R1KH_RESP */
	le16 data_length; /* little endian length of data (76) */
	u8 ap_address[ETH_ALEN];

	u8 nonce[16]; /* copied from pull */
	u8 r1kh_id[FT_R1KH_ID_LEN]; /* copied from pull */
	u8 s1kh_id[ETH_ALEN]; /* copied from pull */
	u8 pmk_r1[PMK_LEN];
	u8 pmk_r1_name[WPA_PMK_NAME_LEN];
	le16 pairwise;
	u8 pad[2]; /* 8-octet boundary for AES key wrap */
	u8 key_wrap_extra[8];
} STRUCT_PACKED;

struct ft_r0kh_r1kh_push_frame {
	u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
	u8 packet_type; /* FT_PACKET_R0KH_R1KH_PUSH */
	le16 data_length; /* little endian length of data (88) */
	u8 ap_address[ETH_ALEN];

	/* Encrypted with AES key-wrap */
	u8 timestamp[4]; /* current time in seconds since unix epoch, little
			  * endian */
	u8 r1kh_id[FT_R1KH_ID_LEN];
	u8 s1kh_id[ETH_ALEN];
	u8 pmk_r0_name[WPA_PMK_NAME_LEN];
	u8 pmk_r1[PMK_LEN];
	u8 pmk_r1_name[WPA_PMK_NAME_LEN];
	le16 pairwise;
	u8 pad[6]; /* 8-octet boundary for AES key wrap */
	u8 key_wrap_extra[8];
} STRUCT_PACKED;

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


/* per STA state machine data */

struct wpa_authenticator;
struct wpa_state_machine;
struct rsn_pmksa_cache_entry;
struct eapol_state_machine;


struct ft_remote_r0kh {
	struct ft_remote_r0kh *next;
	u8 addr[ETH_ALEN];
	u8 id[FT_R0KH_ID_MAX_LEN];
	size_t id_len;
	u8 key[16];
};


struct ft_remote_r1kh {
	struct ft_remote_r1kh *next;
	u8 addr[ETH_ALEN];
	u8 id[FT_R1KH_ID_LEN];
	u8 key[16];
};


struct wpa_auth_config {
	int wpa;
	int wpa_key_mgmt;
	int wpa_pairwise;
	int wpa_group;
	int wpa_group_rekey;
	int wpa_strict_rekey;
	int wpa_gmk_rekey;
	int wpa_ptk_rekey;
	int rsn_pairwise;
	int rsn_preauth;
	int eapol_version;
	int peerkey;
	int wmm_enabled;
	int wmm_uapsd;
	int disable_pmksa_caching;
	int okc;
	int tx_status;
#ifdef CONFIG_IEEE80211W
	enum mfp_options ieee80211w;
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_IEEE80211R
#define SSID_LEN 32
	u8 ssid[SSID_LEN];
	size_t ssid_len;
	u8 mobility_domain[MOBILITY_DOMAIN_ID_LEN];
	u8 r0_key_holder[FT_R0KH_ID_MAX_LEN];
	size_t r0_key_holder_len;
	u8 r1_key_holder[FT_R1KH_ID_LEN];
	u32 r0_key_lifetime;
	u32 reassociation_deadline;
	struct ft_remote_r0kh *r0kh_list;
	struct ft_remote_r1kh *r1kh_list;
	int pmk_r1_push;
	int ft_over_ds;
#endif /* CONFIG_IEEE80211R */
};

typedef enum {
	LOGGER_DEBUG, LOGGER_INFO, LOGGER_WARNING
} logger_level;

typedef enum {
	WPA_EAPOL_portEnabled, WPA_EAPOL_portValid, WPA_EAPOL_authorized,
	WPA_EAPOL_portControl_Auto, WPA_EAPOL_keyRun, WPA_EAPOL_keyAvailable,
	WPA_EAPOL_keyDone, WPA_EAPOL_inc_EapolFramesTx
} wpa_eapol_variable;

struct wpa_auth_callbacks {
	void *ctx;
	void (*logger)(void *ctx, const u8 *addr, logger_level level,
		       const char *txt);
	void (*disconnect)(void *ctx, const u8 *addr, u16 reason);
	void (*mic_failure_report)(void *ctx, const u8 *addr);
	void (*set_eapol)(void *ctx, const u8 *addr, wpa_eapol_variable var,
			  int value);
	int (*get_eapol)(void *ctx, const u8 *addr, wpa_eapol_variable var);
	const u8 * (*get_psk)(void *ctx, const u8 *addr, const u8 *prev_psk);
	int (*get_msk)(void *ctx, const u8 *addr, u8 *msk, size_t *len);
	int (*set_key)(void *ctx, int vlan_id, enum wpa_alg alg,
		       const u8 *addr, int idx, u8 *key, size_t key_len);
	int (*get_seqnum)(void *ctx, const u8 *addr, int idx, u8 *seq);
	int (*send_eapol)(void *ctx, const u8 *addr, const u8 *data,
			  size_t data_len, int encrypt);
	int (*for_each_sta)(void *ctx, int (*cb)(struct wpa_state_machine *sm,
						 void *ctx), void *cb_ctx);
	int (*for_each_auth)(void *ctx, int (*cb)(struct wpa_authenticator *a,
						  void *ctx), void *cb_ctx);
	int (*send_ether)(void *ctx, const u8 *dst, u16 proto, const u8 *data,
			  size_t data_len);
#ifdef CONFIG_IEEE80211R
	struct wpa_state_machine * (*add_sta)(void *ctx, const u8 *sta_addr);
	int (*send_ft_action)(void *ctx, const u8 *dst,
			      const u8 *data, size_t data_len);
#endif /* CONFIG_IEEE80211R */
};

struct wpa_authenticator * wpa_init(const u8 *addr,
				    struct wpa_auth_config *conf,
				    struct wpa_auth_callbacks *cb);
void wpa_deinit(struct wpa_authenticator *wpa_auth);
int wpa_reconfig(struct wpa_authenticator *wpa_auth,
		 struct wpa_auth_config *conf);

enum {
	WPA_IE_OK, WPA_INVALID_IE, WPA_INVALID_GROUP, WPA_INVALID_PAIRWISE,
	WPA_INVALID_AKMP, WPA_NOT_ENABLED, WPA_ALLOC_FAIL,
	WPA_MGMT_FRAME_PROTECTION_VIOLATION, WPA_INVALID_MGMT_GROUP_CIPHER,
	WPA_INVALID_MDIE, WPA_INVALID_PROTO
};
	
int wpa_validate_wpa_ie(struct wpa_authenticator *wpa_auth,
			struct wpa_state_machine *sm,
			const u8 *wpa_ie, size_t wpa_ie_len,
			const u8 *mdie, size_t mdie_len);
int wpa_auth_uses_mfp(struct wpa_state_machine *sm);
struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr);
int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
			    struct wpa_state_machine *sm);
void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm);
void wpa_auth_sta_deinit(struct wpa_state_machine *sm);
void wpa_receive(struct wpa_authenticator *wpa_auth,
		 struct wpa_state_machine *sm,
		 u8 *data, size_t data_len);
typedef enum {
	WPA_AUTH, WPA_ASSOC, WPA_DISASSOC, WPA_DEAUTH, WPA_REAUTH,
	WPA_REAUTH_EAPOL, WPA_ASSOC_FT
} wpa_event;
void wpa_remove_ptk(struct wpa_state_machine *sm);
int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event);
void wpa_auth_sm_notify(struct wpa_state_machine *sm);
void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth);
int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen);
int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen);
void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth);
int wpa_auth_pairwise_set(struct wpa_state_machine *sm);
int wpa_auth_get_pairwise(struct wpa_state_machine *sm);
int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm);
int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm);
int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
			     struct rsn_pmksa_cache_entry *entry);
struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm);
void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm);
const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth,
			       size_t *len);
int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
		       int session_timeout, struct eapol_state_machine *eapol);
int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
			       const u8 *pmk, size_t len, const u8 *sta_addr,
			       int session_timeout,
			       struct eapol_state_machine *eapol);
int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id);
void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
				  struct wpa_state_machine *sm, int ack);

#ifdef CONFIG_IEEE80211R
u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
				 size_t max_len, int auth_alg,
				 const u8 *req_ies, size_t req_ies_len);
void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
			 u16 auth_transaction, const u8 *ies, size_t ies_len,
			 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
				    u16 auth_transaction, u16 resp,
				    const u8 *ies, size_t ies_len),
			 void *ctx);
u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
			    size_t ies_len);
int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len);
int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
		  const u8 *data, size_t data_len);
void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr);
#endif /* CONFIG_IEEE80211R */

#endif /* WPA_AUTH_H */
