/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2007, 2008, 2009 Siemens AG
 *
 * Written by:
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 */

#ifndef __NET_CFG802154_H
#define __NET_CFG802154_H

#include <linux/ieee802154.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/bug.h>

#include <net/nl802154.h>

struct wpan_phy;
struct wpan_phy_cca;
struct cfg802154_scan_request;
struct cfg802154_beacon_request;
struct ieee802154_addr;

#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
struct ieee802154_llsec_device_key;
struct ieee802154_llsec_seclevel;
struct ieee802154_llsec_params;
struct ieee802154_llsec_device;
struct ieee802154_llsec_table;
struct ieee802154_llsec_key_id;
struct ieee802154_llsec_key;
#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */

struct cfg802154_ops {
        struct net_device * (*add_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
                                                           const char *name,
                                                           unsigned char name_assign_type,
                                                           int type);
        void    (*del_virtual_intf_deprecated)(struct wpan_phy *wpan_phy,
                                               struct net_device *dev);
        int     (*suspend)(struct wpan_phy *wpan_phy);
        int     (*resume)(struct wpan_phy *wpan_phy);
        int     (*add_virtual_intf)(struct wpan_phy *wpan_phy,
                                    const char *name,
                                    unsigned char name_assign_type,
                                    enum nl802154_iftype type,
                                    __le64 extended_addr);
        int     (*del_virtual_intf)(struct wpan_phy *wpan_phy,
                                    struct wpan_dev *wpan_dev);
        int     (*set_channel)(struct wpan_phy *wpan_phy, u8 page, u8 channel);
        int     (*set_cca_mode)(struct wpan_phy *wpan_phy,
                                const struct wpan_phy_cca *cca);
        int     (*set_cca_ed_level)(struct wpan_phy *wpan_phy, s32 ed_level);
        int     (*set_tx_power)(struct wpan_phy *wpan_phy, s32 power);
        int     (*set_pan_id)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev, __le16 pan_id);
        int     (*set_short_addr)(struct wpan_phy *wpan_phy,
                                  struct wpan_dev *wpan_dev, __le16 short_addr);
        int     (*set_backoff_exponent)(struct wpan_phy *wpan_phy,
                                        struct wpan_dev *wpan_dev, u8 min_be,
                                        u8 max_be);
        int     (*set_max_csma_backoffs)(struct wpan_phy *wpan_phy,
                                         struct wpan_dev *wpan_dev,
                                         u8 max_csma_backoffs);
        int     (*set_max_frame_retries)(struct wpan_phy *wpan_phy,
                                         struct wpan_dev *wpan_dev,
                                         s8 max_frame_retries);
        int     (*set_lbt_mode)(struct wpan_phy *wpan_phy,
                                struct wpan_dev *wpan_dev, bool mode);
        int     (*set_ackreq_default)(struct wpan_phy *wpan_phy,
                                      struct wpan_dev *wpan_dev, bool ackreq);
        int     (*trigger_scan)(struct wpan_phy *wpan_phy,
                                struct cfg802154_scan_request *request);
        int     (*abort_scan)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev);
        int     (*send_beacons)(struct wpan_phy *wpan_phy,
                                struct cfg802154_beacon_request *request);
        int     (*stop_beacons)(struct wpan_phy *wpan_phy,
                                struct wpan_dev *wpan_dev);
        int     (*associate)(struct wpan_phy *wpan_phy,
                             struct wpan_dev *wpan_dev,
                             struct ieee802154_addr *coord);
        int     (*disassociate)(struct wpan_phy *wpan_phy,
                                struct wpan_dev *wpan_dev,
                                struct ieee802154_addr *target);
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
        void    (*get_llsec_table)(struct wpan_phy *wpan_phy,
                                   struct wpan_dev *wpan_dev,
                                   struct ieee802154_llsec_table **table);
        void    (*lock_llsec_table)(struct wpan_phy *wpan_phy,
                                    struct wpan_dev *wpan_dev);
        void    (*unlock_llsec_table)(struct wpan_phy *wpan_phy,
                                      struct wpan_dev *wpan_dev);
        /* TODO remove locking/get table callbacks, this is part of the
         * nl802154 interface and should be accessible from ieee802154 layer.
         */
        int     (*get_llsec_params)(struct wpan_phy *wpan_phy,
                                    struct wpan_dev *wpan_dev,
                                    struct ieee802154_llsec_params *params);
        int     (*set_llsec_params)(struct wpan_phy *wpan_phy,
                                    struct wpan_dev *wpan_dev,
                                    const struct ieee802154_llsec_params *params,
                                    int changed);
        int     (*add_llsec_key)(struct wpan_phy *wpan_phy,
                                 struct wpan_dev *wpan_dev,
                                 const struct ieee802154_llsec_key_id *id,
                                 const struct ieee802154_llsec_key *key);
        int     (*del_llsec_key)(struct wpan_phy *wpan_phy,
                                 struct wpan_dev *wpan_dev,
                                 const struct ieee802154_llsec_key_id *id);
        int     (*add_seclevel)(struct wpan_phy *wpan_phy,
                                 struct wpan_dev *wpan_dev,
                                 const struct ieee802154_llsec_seclevel *sl);
        int     (*del_seclevel)(struct wpan_phy *wpan_phy,
                                 struct wpan_dev *wpan_dev,
                                 const struct ieee802154_llsec_seclevel *sl);
        int     (*add_device)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev,
                              const struct ieee802154_llsec_device *dev);
        int     (*del_device)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev, __le64 extended_addr);
        int     (*add_devkey)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev,
                              __le64 extended_addr,
                              const struct ieee802154_llsec_device_key *key);
        int     (*del_devkey)(struct wpan_phy *wpan_phy,
                              struct wpan_dev *wpan_dev,
                              __le64 extended_addr,
                              const struct ieee802154_llsec_device_key *key);
#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
};

static inline bool
wpan_phy_supported_bool(bool b, enum nl802154_supported_bool_states st)
{
        switch (st) {
        case NL802154_SUPPORTED_BOOL_TRUE:
                return b;
        case NL802154_SUPPORTED_BOOL_FALSE:
                return !b;
        case NL802154_SUPPORTED_BOOL_BOTH:
                return true;
        default:
                WARN_ON(1);
        }

        return false;
}

struct wpan_phy_supported {
        u32 channels[IEEE802154_MAX_PAGE + 1],
            cca_modes, cca_opts, iftypes;
        enum nl802154_supported_bool_states lbt;
        u8 min_minbe, max_minbe, min_maxbe, max_maxbe,
           min_csma_backoffs, max_csma_backoffs;
        s8 min_frame_retries, max_frame_retries;
        size_t tx_powers_size, cca_ed_levels_size;
        const s32 *tx_powers, *cca_ed_levels;
};

struct wpan_phy_cca {
        enum nl802154_cca_modes mode;
        enum nl802154_cca_opts opt;
};

static inline bool
wpan_phy_cca_cmp(const struct wpan_phy_cca *a, const struct wpan_phy_cca *b)
{
        if (a->mode != b->mode)
                return false;

        if (a->mode == NL802154_CCA_ENERGY_CARRIER)
                return a->opt == b->opt;

        return true;
}

/**
 * enum wpan_phy_flags - WPAN PHY state flags
 * @WPAN_PHY_FLAG_TXPOWER: Indicates that transceiver will support
 *      transmit power setting.
 * @WPAN_PHY_FLAG_CCA_ED_LEVEL: Indicates that transceiver will support cca ed
 *      level setting.
 * @WPAN_PHY_FLAG_CCA_MODE: Indicates that transceiver will support cca mode
 *      setting.
 * @WPAN_PHY_FLAG_STATE_QUEUE_STOPPED: Indicates that the transmit queue was
 *      temporarily stopped.
 * @WPAN_PHY_FLAG_DATAGRAMS_ONLY: Indicates that transceiver is only able to
 *      send/receive datagrams.
 */
enum wpan_phy_flags {
        WPAN_PHY_FLAG_TXPOWER           = BIT(1),
        WPAN_PHY_FLAG_CCA_ED_LEVEL      = BIT(2),
        WPAN_PHY_FLAG_CCA_MODE          = BIT(3),
        WPAN_PHY_FLAG_STATE_QUEUE_STOPPED = BIT(4),
        WPAN_PHY_FLAG_DATAGRAMS_ONLY    = BIT(5),
};

struct wpan_phy {
        /* If multiple wpan_phys are registered and you're handed e.g.
         * a regular netdev with assigned ieee802154_ptr, you won't
         * know whether it points to a wpan_phy your driver has registered
         * or not. Assign this to something global to your driver to
         * help determine whether you own this wpan_phy or not.
         */
        const void *privid;

        unsigned long flags;

        /*
         * This is a PIB according to 802.15.4-2011.
         * We do not provide timing-related variables, as they
         * aren't used outside of driver
         */
        u8 current_channel;
        u8 current_page;
        struct wpan_phy_supported supported;
        /* current transmit_power in mBm */
        s32 transmit_power;
        struct wpan_phy_cca cca;

        __le64 perm_extended_addr;

        /* current cca ed threshold in mBm */
        s32 cca_ed_level;

        /* PHY depended MAC PIB values */

        /* 802.15.4 acronym: Tdsym in nsec */
        u32 symbol_duration;
        /* lifs and sifs periods timing */
        u16 lifs_period;
        u16 sifs_period;

        struct device dev;

        /* the network namespace this phy lives in currently */
        possible_net_t _net;

        /* Transmission monitoring and control */
        spinlock_t queue_lock;
        atomic_t ongoing_txs;
        atomic_t hold_txs;
        wait_queue_head_t sync_txq;

        /* Current filtering level on reception.
         * Only allowed to be changed if phy is not operational.
         */
        enum ieee802154_filtering_level filtering;

        char priv[] __aligned(NETDEV_ALIGN);
};

static inline struct net *wpan_phy_net(struct wpan_phy *wpan_phy)
{
        return read_pnet(&wpan_phy->_net);
}

static inline void wpan_phy_net_set(struct wpan_phy *wpan_phy, struct net *net)
{
        write_pnet(&wpan_phy->_net, net);
}

static inline bool ieee802154_chan_is_valid(struct wpan_phy *phy,
                                            u8 page, u8 channel)
{
        if (page > IEEE802154_MAX_PAGE ||
            channel > IEEE802154_MAX_CHANNEL ||
            !(phy->supported.channels[page] & BIT(channel)))
                return false;

        return true;
}

/**
 * struct ieee802154_addr - IEEE802.15.4 device address
 * @mode: Address mode from frame header. Can be one of:
 *        - @IEEE802154_ADDR_NONE
 *        - @IEEE802154_ADDR_SHORT
 *        - @IEEE802154_ADDR_LONG
 * @pan_id: The PAN ID this address belongs to
 * @short_addr: address if @mode is @IEEE802154_ADDR_SHORT
 * @extended_addr: address if @mode is @IEEE802154_ADDR_LONG
 */
struct ieee802154_addr {
        u8 mode;
        __le16 pan_id;
        union {
                __le16 short_addr;
                __le64 extended_addr;
        };
};

/**
 * struct ieee802154_coord_desc - Coordinator descriptor
 * @addr: PAN ID and coordinator address
 * @page: page this coordinator is using
 * @channel: channel this coordinator is using
 * @superframe_spec: SuperFrame specification as received
 * @link_quality: link quality indicator at which the beacon was received
 * @gts_permit: the coordinator accepts GTS requests
 */
struct ieee802154_coord_desc {
        struct ieee802154_addr addr;
        u8 page;
        u8 channel;
        u16 superframe_spec;
        u8 link_quality;
        bool gts_permit;
};

/**
 * struct ieee802154_pan_device - PAN device information
 * @pan_id: the PAN ID of this device
 * @mode: the preferred mode to reach the device
 * @short_addr: the short address of this device
 * @extended_addr: the extended address of this device
 * @node: the list node
 */
struct ieee802154_pan_device {
        __le16 pan_id;
        u8 mode;
        __le16 short_addr;
        __le64 extended_addr;
        struct list_head node;
};

/**
 * struct cfg802154_scan_request - Scan request
 *
 * @type: type of scan to be performed
 * @page: page on which to perform the scan
 * @channels: channels in te %page to be scanned
 * @duration: time spent on each channel, calculated with:
 *            aBaseSuperframeDuration * (2 ^ duration + 1)
 * @wpan_dev: the wpan device on which to perform the scan
 * @wpan_phy: the wpan phy on which to perform the scan
 */
struct cfg802154_scan_request {
        enum nl802154_scan_types type;
        u8 page;
        u32 channels;
        u8 duration;
        struct wpan_dev *wpan_dev;
        struct wpan_phy *wpan_phy;
};

/**
 * struct cfg802154_beacon_request - Beacon request descriptor
 *
 * @interval: interval n between sendings, in multiple order of the super frame
 *            duration: aBaseSuperframeDuration * (2^n) unless the interval
 *            order is greater or equal to 15, in this case beacons won't be
 *            passively sent out at a fixed rate but instead inform the device
 *            that it should answer beacon requests as part of active scan
 *            procedures
 * @wpan_dev: the concerned wpan device
 * @wpan_phy: the wpan phy this was for
 */
struct cfg802154_beacon_request {
        u8 interval;
        struct wpan_dev *wpan_dev;
        struct wpan_phy *wpan_phy;
};

/**
 * struct cfg802154_mac_pkt - MAC packet descriptor (beacon/command)
 * @node: MAC packets to process list member
 * @skb: the received sk_buff
 * @sdata: the interface on which @skb was received
 * @page: page configuration when @skb was received
 * @channel: channel configuration when @skb was received
 */
struct cfg802154_mac_pkt {
        struct list_head node;
        struct sk_buff *skb;
        struct ieee802154_sub_if_data *sdata;
        u8 page;
        u8 channel;
};

struct ieee802154_llsec_key_id {
        u8 mode;
        u8 id;
        union {
                struct ieee802154_addr device_addr;
                __le32 short_source;
                __le64 extended_source;
        };
};

#define IEEE802154_LLSEC_KEY_SIZE 16

struct ieee802154_llsec_key {
        u8 frame_types;
        u32 cmd_frame_ids;
        /* TODO replace with NL802154_KEY_SIZE */
        u8 key[IEEE802154_LLSEC_KEY_SIZE];
};

struct ieee802154_llsec_key_entry {
        struct list_head list;
        struct rcu_head rcu;

        struct ieee802154_llsec_key_id id;
        struct ieee802154_llsec_key *key;
};

struct ieee802154_llsec_params {
        bool enabled;

        __be32 frame_counter;
        u8 out_level;
        struct ieee802154_llsec_key_id out_key;

        __le64 default_key_source;

        __le16 pan_id;
        __le64 hwaddr;
        __le64 coord_hwaddr;
        __le16 coord_shortaddr;
};

struct ieee802154_llsec_table {
        struct list_head keys;
        struct list_head devices;
        struct list_head security_levels;
};

struct ieee802154_llsec_seclevel {
        struct list_head list;

        u8 frame_type;
        u8 cmd_frame_id;
        bool device_override;
        u32 sec_levels;
};

struct ieee802154_llsec_device {
        struct list_head list;

        __le16 pan_id;
        __le16 short_addr;
        __le64 hwaddr;
        u32 frame_counter;
        bool seclevel_exempt;

        u8 key_mode;
        struct list_head keys;
};

struct ieee802154_llsec_device_key {
        struct list_head list;

        struct ieee802154_llsec_key_id key_id;
        u32 frame_counter;
};

struct wpan_dev_header_ops {
        /* TODO create callback currently assumes ieee802154_mac_cb inside
         * skb->cb. This should be changed to give these information as
         * parameter.
         */
        int     (*create)(struct sk_buff *skb, struct net_device *dev,
                          const struct ieee802154_addr *daddr,
                          const struct ieee802154_addr *saddr,
                          unsigned int len);
};

struct wpan_dev {
        struct wpan_phy *wpan_phy;
        int iftype;

        /* the remainder of this struct should be private to cfg802154 */
        struct list_head list;
        struct net_device *netdev;

        const struct wpan_dev_header_ops *header_ops;

        /* lowpan interface, set when the wpan_dev belongs to one lowpan_dev */
        struct net_device *lowpan_dev;

        u32 identifier;

        /* MAC PIB */
        __le16 pan_id;
        __le16 short_addr;
        __le64 extended_addr;

        /* MAC BSN field */
        atomic_t bsn;
        /* MAC DSN field */
        atomic_t dsn;

        u8 min_be;
        u8 max_be;
        u8 csma_retries;
        s8 frame_retries;

        bool lbt;

        /* fallback for acknowledgment bit setting */
        bool ackreq;

        /* Associations */
        struct mutex association_lock;
        struct ieee802154_pan_device *parent;
        struct list_head children;
        unsigned int max_associations;
        unsigned int nchildren;
};

#define to_phy(_dev)    container_of(_dev, struct wpan_phy, dev)

#if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN)
static inline int
wpan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
                     const struct ieee802154_addr *daddr,
                     const struct ieee802154_addr *saddr,
                     unsigned int len)
{
        struct wpan_dev *wpan_dev = dev->ieee802154_ptr;

        return wpan_dev->header_ops->create(skb, dev, daddr, saddr, len);
}
#endif

struct wpan_phy *
wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size);
static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)
{
        phy->dev.parent = dev;
}

int wpan_phy_register(struct wpan_phy *phy);
void wpan_phy_unregister(struct wpan_phy *phy);
void wpan_phy_free(struct wpan_phy *phy);
/* Same semantics as for class_for_each_device */
int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), void *data);

static inline void *wpan_phy_priv(struct wpan_phy *phy)
{
        BUG_ON(!phy);
        return &phy->priv;
}

struct wpan_phy *wpan_phy_find(const char *str);

static inline void wpan_phy_put(struct wpan_phy *phy)
{
        put_device(&phy->dev);
}

static inline const char *wpan_phy_name(struct wpan_phy *phy)
{
        return dev_name(&phy->dev);
}

void ieee802154_configure_durations(struct wpan_phy *phy,
                                    unsigned int page, unsigned int channel);

/**
 * cfg802154_device_is_associated - Checks whether we are associated to any device
 * @wpan_dev: the wpan device
 * @return: true if we are associated
 */
bool cfg802154_device_is_associated(struct wpan_dev *wpan_dev);

/**
 * cfg802154_device_is_parent - Checks if a device is our coordinator
 * @wpan_dev: the wpan device
 * @target: the expected parent
 * @return: true if @target is our coordinator
 */
bool cfg802154_device_is_parent(struct wpan_dev *wpan_dev,
                                struct ieee802154_addr *target);

/**
 * cfg802154_device_is_child - Checks whether a device is associated to us
 * @wpan_dev: the wpan device
 * @target: the expected child
 * @return: the PAN device
 */
struct ieee802154_pan_device *
cfg802154_device_is_child(struct wpan_dev *wpan_dev,
                          struct ieee802154_addr *target);

/**
 * cfg802154_set_max_associations - Limit the number of future associations
 * @wpan_dev: the wpan device
 * @max: the maximum number of devices we accept to associate
 * @return: the old maximum value
 */
unsigned int cfg802154_set_max_associations(struct wpan_dev *wpan_dev,
                                            unsigned int max);

/**
 * cfg802154_get_free_short_addr - Get a free address among the known devices
 * @wpan_dev: the wpan device
 * @return: a random short address expectedly unused on our PAN
 */
__le16 cfg802154_get_free_short_addr(struct wpan_dev *wpan_dev);

#endif /* __NET_CFG802154_H */