/*
 * wpa_supplicant - WPA2/RSN PMKSA cache functions
 * Copyright (c) 2003-2009, 2011-2012, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#ifndef PMKSA_CACHE_H
#define PMKSA_CACHE_H

/**
 * struct rsn_pmksa_cache_entry - PMKSA cache entry
 */
struct rsn_pmksa_cache_entry {
    struct rsn_pmksa_cache_entry *next;
    u8 pmkid[PMKID_LEN];
    u8 pmk[PMK_LEN];
    size_t pmk_len;
    os_time_t expiration;
    int akmp; /* WPA_KEY_MGMT_* */
    u8 aa[ETH_ALEN];

    os_time_t reauth_time;

    /**
     * network_ctx - Network configuration context
     *
     * This field is only used to match PMKSA cache entries to a specific
     * network configuration (e.g., a specific SSID and security policy).
     * This can be a pointer to the configuration entry, but PMKSA caching
     * code does not dereference the value and this could be any kind of
     * identifier.
     */
    void *network_ctx;
    int opportunistic;
};

struct rsn_pmksa_cache;

enum pmksa_free_reason {
    PMKSA_FREE,
    PMKSA_REPLACE,
    PMKSA_EXPIRE,
};

#ifdef IEEE8021X_EAPOL

struct rsn_pmksa_cache *
pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,
            void *ctx, enum pmksa_free_reason reason),
        void *ctx, struct wpa_sm *sm);
void pmksa_cache_deinit(struct rsn_pmksa_cache *pmksa);
struct rsn_pmksa_cache_entry * pmksa_cache_get(struct rsn_pmksa_cache *pmksa,
        const u8 *aa, const u8 *pmkid,
        const void *network_ctx);
int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len);
struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
        const u8 *pmkid, const u8 *kck, size_t kck_len,
        const u8 *aa, const u8 *spa, void *network_ctx, int akmp);
struct rsn_pmksa_cache_entry * pmksa_cache_get_current(struct wpa_sm *sm);
void pmksa_cache_clear_current(struct wpa_sm *sm);
int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
        const u8 *bssid, void *network_ctx,
        int try_opportunistic);
struct rsn_pmksa_cache_entry *
pmksa_cache_get_opportunistic(struct rsn_pmksa_cache *pmksa,
        void *network_ctx, const u8 *aa);
void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa, void *network_ctx,
        const u8 *pmk, size_t pmk_len);

#else /* IEEE8021X_EAPOL */

    static inline struct rsn_pmksa_cache *
pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,
            void *ctx, enum pmksa_free_reason reason),
        void *ctx, struct wpa_sm *sm)
{
    return (void *) -1;
}

static inline void pmksa_cache_deinit(struct rsn_pmksa_cache *pmksa)
{
}

    static inline struct rsn_pmksa_cache_entry *
pmksa_cache_get(struct rsn_pmksa_cache *pmksa, const u8 *aa, const u8 *pmkid,
        const void *network_ctx)
{
    return NULL;
}

    static inline struct rsn_pmksa_cache_entry *
pmksa_cache_get_current(struct wpa_sm *sm)
{
    return NULL;
}

static inline int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf,
        size_t len)
{
    return -1;
}

    static inline struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
        const u8 *pmkid, const u8 *kck, size_t kck_len,
        const u8 *aa, const u8 *spa, void *network_ctx, int akmp)
{
    return NULL;
}

static inline void pmksa_cache_clear_current(struct wpa_sm *sm)
{
}

static inline int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
        const u8 *bssid,
        void *network_ctx,
        int try_opportunistic)
{
    return -1;
}

static inline void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa,
        void *network_ctx,
        const u8 *pmk, size_t pmk_len)
{
}

#endif /* IEEE8021X_EAPOL */

#endif /* PMKSA_CACHE_H */