P2P: Document p2p_in_progress() return value 2

[mech_eap.git] / src / p2p / p2p.h

/*
 * Wi-Fi Direct - P2P module
 * Copyright (c) 2009-2010, Atheros Communications
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#ifndef P2P_H
#define P2P_H

#include "wps/wps_defs.h"

/**
 * P2P_MAX_REG_CLASSES - Maximum number of regulatory classes
 */
#define P2P_MAX_REG_CLASSES 10

/**
 * P2P_MAX_REG_CLASS_CHANNELS - Maximum number of channels per regulatory class
 */
#define P2P_MAX_REG_CLASS_CHANNELS 20

/**
 * struct p2p_channels - List of supported channels
 */
struct p2p_channels {
        /**
         * struct p2p_reg_class - Supported regulatory class
         */
        struct p2p_reg_class {
                /**
                 * reg_class - Regulatory class (IEEE 802.11-2007, Annex J)
                 */
                u8 reg_class;

                /**
                 * channel - Supported channels
                 */
                u8 channel[P2P_MAX_REG_CLASS_CHANNELS];

                /**
                 * channels - Number of channel entries in use
                 */
                size_t channels;
        } reg_class[P2P_MAX_REG_CLASSES];

        /**
         * reg_classes - Number of reg_class entries in use
         */
        size_t reg_classes;
};

enum p2p_wps_method {
        WPS_NOT_READY, WPS_PIN_DISPLAY, WPS_PIN_KEYPAD, WPS_PBC, WPS_NFC
};

/**
 * struct p2p_go_neg_results - P2P Group Owner Negotiation results
 */
struct p2p_go_neg_results {
        /**
         * status - Negotiation result (Status Code)
         *
         * 0 (P2P_SC_SUCCESS) indicates success. Non-zero values indicate
         * failed negotiation.
         */
        int status;

        /**
         * role_go - Whether local end is Group Owner
         */
        int role_go;

        /**
         * freq - Frequency of the group operational channel in MHz
         */
        int freq;

        int ht40;

        int vht;

        /**
         * ssid - SSID of the group
         */
        u8 ssid[32];

        /**
         * ssid_len - Length of SSID in octets
         */
        size_t ssid_len;

        /**
         * psk - WPA pre-shared key (256 bits) (GO only)
         */
        u8 psk[32];

        /**
         * psk_set - Whether PSK field is configured (GO only)
         */
        int psk_set;

        /**
         * passphrase - WPA2-Personal passphrase for the group (GO only)
         */
        char passphrase[64];

        /**
         * peer_device_addr - P2P Device Address of the peer
         */
        u8 peer_device_addr[ETH_ALEN];

        /**
         * peer_interface_addr - P2P Interface Address of the peer
         */
        u8 peer_interface_addr[ETH_ALEN];

        /**
         * wps_method - WPS method to be used during provisioning
         */
        enum p2p_wps_method wps_method;

#define P2P_MAX_CHANNELS 50

        /**
         * freq_list - Zero-terminated list of possible operational channels
         */
        int freq_list[P2P_MAX_CHANNELS];

        /**
         * persistent_group - Whether the group should be made persistent
         * 0 = not persistent
         * 1 = persistent group without persistent reconnect
         * 2 = persistent group with persistent reconnect
         */
        int persistent_group;

        /**
         * peer_config_timeout - Peer configuration timeout (in 10 msec units)
         */
        unsigned int peer_config_timeout;
};

struct p2p_data;

enum p2p_scan_type {
        P2P_SCAN_SOCIAL,
        P2P_SCAN_FULL,
        P2P_SCAN_SOCIAL_PLUS_ONE
};

#define P2P_MAX_WPS_VENDOR_EXT 10

/**
 * struct p2p_peer_info - P2P peer information
 */
struct p2p_peer_info {
        /**
         * p2p_device_addr - P2P Device Address of the peer
         */
        u8 p2p_device_addr[ETH_ALEN];

        /**
         * pri_dev_type - Primary Device Type
         */
        u8 pri_dev_type[8];

        /**
         * device_name - Device Name (0..32 octets encoded in UTF-8)
         */
        char device_name[33];

        /**
         * manufacturer - Manufacturer (0..64 octets encoded in UTF-8)
         */
        char manufacturer[65];

        /**
         * model_name - Model Name (0..32 octets encoded in UTF-8)
         */
        char model_name[33];

        /**
         * model_number - Model Number (0..32 octets encoded in UTF-8)
         */
        char model_number[33];

        /**
         * serial_number - Serial Number (0..32 octets encoded in UTF-8)
         */
        char serial_number[33];

        /**
         * level - Signal level
         */
        int level;

        /**
         * config_methods - WPS Configuration Methods
         */
        u16 config_methods;

        /**
         * dev_capab - Device Capabilities
         */
        u8 dev_capab;

        /**
         * group_capab - Group Capabilities
         */
        u8 group_capab;

        /**
         * wps_sec_dev_type_list - WPS secondary device type list
         *
         * This list includes from 0 to 16 Secondary Device Types as indicated
         * by wps_sec_dev_type_list_len (8 * number of types).
         */
        u8 wps_sec_dev_type_list[128];

        /**
         * wps_sec_dev_type_list_len - Length of secondary device type list
         */
        size_t wps_sec_dev_type_list_len;

        struct wpabuf *wps_vendor_ext[P2P_MAX_WPS_VENDOR_EXT];

        /**
         * wfd_subelems - Wi-Fi Display subelements from WFD IE(s)
         */
        struct wpabuf *wfd_subelems;

        /**
         * vendor_elems - Unrecognized vendor elements
         *
         * This buffer includes any other vendor element than P2P, WPS, and WFD
         * IE(s) from the frame that was used to discover the peer.
         */
        struct wpabuf *vendor_elems;
};

enum p2p_prov_disc_status {
        P2P_PROV_DISC_SUCCESS,
        P2P_PROV_DISC_TIMEOUT,
        P2P_PROV_DISC_REJECTED,
        P2P_PROV_DISC_TIMEOUT_JOIN,
};

struct p2p_channel {
        u8 op_class;
        u8 chan;
};

/**
 * struct p2p_config - P2P configuration
 *
 * This configuration is provided to the P2P module during initialization with
 * p2p_init().
 */
struct p2p_config {
        /**
         * country - Country code to use in P2P operations
         */
        char country[3];

        /**
         * reg_class - Regulatory class for own listen channel
         */
        u8 reg_class;

        /**
         * channel - Own listen channel
         */
        u8 channel;

        /**
         * channel_forced - the listen channel was forced by configuration
         *                  or by control interface and cannot be overridden
         */
        u8 channel_forced;

        /**
         * Regulatory class for own operational channel
         */
        u8 op_reg_class;

        /**
         * op_channel - Own operational channel
         */
        u8 op_channel;

        /**
         * cfg_op_channel - Whether op_channel is hardcoded in configuration
         */
        u8 cfg_op_channel;

        /**
         * channels - Own supported regulatory classes and channels
         *
         * List of supposerted channels per regulatory class. The regulatory
         * classes are defined in IEEE Std 802.11-2007 Annex J and the
         * numbering of the clases depends on the configured country code.
         */
        struct p2p_channels channels;

        /**
         * cli_channels - Additional client channels
         *
         * This list of channels (if any) will be used when advertising local
         * channels during GO Negotiation or Invitation for the cases where the
         * local end may become the client. This may allow the peer to become a
         * GO on additional channels if it supports these options. The main use
         * case for this is to include passive-scan channels on devices that may
         * not know their current location and have configured most channels to
         * not allow initiation of radition (i.e., another device needs to take
         * master responsibilities).
         */
        struct p2p_channels cli_channels;

        /**
         * num_pref_chan - Number of pref_chan entries
         */
        unsigned int num_pref_chan;

        /**
         * pref_chan - Preferred channels for GO Negotiation
         */
        struct p2p_channel *pref_chan;

        /**
         * pri_dev_type - Primary Device Type (see WPS)
         */
        u8 pri_dev_type[8];

        /**
         * P2P_SEC_DEVICE_TYPES - Maximum number of secondary device types
         */
#define P2P_SEC_DEVICE_TYPES 5

        /**
         * sec_dev_type - Optional secondary device types
         */
        u8 sec_dev_type[P2P_SEC_DEVICE_TYPES][8];

        /**
         * num_sec_dev_types - Number of sec_dev_type entries
         */
        size_t num_sec_dev_types;

        /**
         * dev_addr - P2P Device Address
         */
        u8 dev_addr[ETH_ALEN];

        /**
         * dev_name - Device Name
         */
        char *dev_name;

        char *manufacturer;
        char *model_name;
        char *model_number;
        char *serial_number;

        u8 uuid[16];
        u16 config_methods;

        /**
         * concurrent_operations - Whether concurrent operations are supported
         */
        int concurrent_operations;

        /**
         * max_peers - Maximum number of discovered peers to remember
         *
         * If more peers are discovered, older entries will be removed to make
         * room for the new ones.
         */
        size_t max_peers;

        /**
         * p2p_intra_bss - Intra BSS communication is supported
         */
        int p2p_intra_bss;

        /**
         * ssid_postfix - Postfix data to add to the SSID
         *
         * This data will be added to the end of the SSID after the
         * DIRECT-<random two octets> prefix.
         */
        u8 ssid_postfix[32 - 9];

        /**
         * ssid_postfix_len - Length of the ssid_postfix data
         */
        size_t ssid_postfix_len;

        /**
         * max_listen - Maximum listen duration in ms
         */
        unsigned int max_listen;

        /**
         * passphrase_len - Passphrase length (8..63)
         *
         * This parameter controls the length of the random passphrase that is
         * generated at the GO.
         */
        unsigned int passphrase_len;

        /**
         * cb_ctx - Context to use with callback functions
         */
        void *cb_ctx;

        /**
         * debug_print - Debug print
         * @ctx: Callback context from cb_ctx
         * @level: Debug verbosity level (MSG_*)
         * @msg: Debug message
         */
        void (*debug_print)(void *ctx, int level, const char *msg);


        /* Callbacks to request lower layer driver operations */

        /**
         * p2p_scan - Request a P2P scan/search
         * @ctx: Callback context from cb_ctx
         * @type: Scan type
         * @freq: Specific frequency (MHz) to scan or 0 for no restriction
         * @num_req_dev_types: Number of requested device types
         * @req_dev_types: Array containing requested device types
         * @dev_id: Device ID to search for or %NULL to find all devices
         * @pw_id: Device Password ID
         * Returns: 0 on success, -1 on failure
         *
         * This callback function is used to request a P2P scan or search
         * operation to be completed. Type type argument specifies which type
         * of scan is to be done. @P2P_SCAN_SOCIAL indicates that only the
         * social channels (1, 6, 11) should be scanned. @P2P_SCAN_FULL
         * indicates that all channels are to be scanned.
         * @P2P_SCAN_SOCIAL_PLUS_ONE request scan of all the social channels
         * plus one extra channel specified by freq.
         *
         * The full scan is used for the initial scan to find group owners from
         * all. The other types are used during search phase scan of the social
         * channels (with potential variation if the Listen channel of the
         * target peer is known or if other channels are scanned in steps).
         *
         * The scan results are returned after this call by calling
         * p2p_scan_res_handler() for each scan result that has a P2P IE and
         * then calling p2p_scan_res_handled() to indicate that all scan
         * results have been indicated.
         */
        int (*p2p_scan)(void *ctx, enum p2p_scan_type type, int freq,
                        unsigned int num_req_dev_types,
                        const u8 *req_dev_types, const u8 *dev_id, u16 pw_id);

        /**
         * send_probe_resp - Transmit a Probe Response frame
         * @ctx: Callback context from cb_ctx
         * @buf: Probe Response frame (including the header and body)
         * Returns: 0 on success, -1 on failure
         *
         * This function is used to reply to Probe Request frames that were
         * indicated with a call to p2p_probe_req_rx(). The response is to be
         * sent on the same channel or to be dropped if the driver is not
         * anymore listening to Probe Request frames.
         *
         * Alternatively, the responsibility for building the Probe Response
         * frames in Listen state may be in another system component in which
         * case this function need to be implemented (i.e., the function
         * pointer can be %NULL). The WPS and P2P IEs to be added for Probe
         * Response frames in such a case are available from the
         * start_listen() callback. It should be noted that the received Probe
         * Request frames must be indicated by calling p2p_probe_req_rx() even
         * if this send_probe_resp() is not used.
         */
        int (*send_probe_resp)(void *ctx, const struct wpabuf *buf);

        /**
         * send_action - Transmit an Action frame
         * @ctx: Callback context from cb_ctx
         * @freq: Frequency in MHz for the channel on which to transmit
         * @dst: Destination MAC address (Address 1)
         * @src: Source MAC address (Address 2)
         * @bssid: BSSID (Address 3)
         * @buf: Frame body (starting from Category field)
         * @len: Length of buf in octets
         * @wait_time: How many msec to wait for a response frame
         * Returns: 0 on success, -1 on failure
         *
         * The Action frame may not be transmitted immediately and the status
         * of the transmission must be reported by calling
         * p2p_send_action_cb() once the frame has either been transmitted or
         * it has been dropped due to excessive retries or other failure to
         * transmit.
         */
        int (*send_action)(void *ctx, unsigned int freq, const u8 *dst,
                           const u8 *src, const u8 *bssid, const u8 *buf,
                           size_t len, unsigned int wait_time);

        /**
         * send_action_done - Notify that Action frame sequence was completed
         * @ctx: Callback context from cb_ctx
         *
         * This function is called when the Action frame sequence that was
         * started with send_action() has been completed, i.e., when there is
         * no need to wait for a response from the destination peer anymore.
         */
        void (*send_action_done)(void *ctx);

        /**
         * start_listen - Start Listen state
         * @ctx: Callback context from cb_ctx
         * @freq: Frequency of the listen channel in MHz
         * @duration: Duration for the Listen state in milliseconds
         * @probe_resp_ie: IE(s) to be added to Probe Response frames
         * Returns: 0 on success, -1 on failure
         *
         * This Listen state may not start immediately since the driver may
         * have other pending operations to complete first. Once the Listen
         * state has started, p2p_listen_cb() must be called to notify the P2P
         * module. Once the Listen state is stopped, p2p_listen_end() must be
         * called to notify the P2P module that the driver is not in the Listen
         * state anymore.
         *
         * If the send_probe_resp() is not used for generating the response,
         * the IEs from probe_resp_ie need to be added to the end of the Probe
         * Response frame body. If send_probe_resp() is used, the probe_resp_ie
         * information can be ignored.
         */
        int (*start_listen)(void *ctx, unsigned int freq,
                            unsigned int duration,
                            const struct wpabuf *probe_resp_ie);
        /**
         * stop_listen - Stop Listen state
         * @ctx: Callback context from cb_ctx
         *
         * This callback can be used to stop a Listen state operation that was
         * previously requested with start_listen().
         */
        void (*stop_listen)(void *ctx);

        /**
         * get_noa - Get current Notice of Absence attribute payload
         * @ctx: Callback context from cb_ctx
         * @interface_addr: P2P Interface Address of the GO
         * @buf: Buffer for returning NoA
         * @buf_len: Buffer length in octets
         * Returns: Number of octets used in buf, 0 to indicate no NoA is being
         * advertized, or -1 on failure
         *
         * This function is used to fetch the current Notice of Absence
         * attribute value from GO.
         */
        int (*get_noa)(void *ctx, const u8 *interface_addr, u8 *buf,
                       size_t buf_len);

        /* Callbacks to notify events to upper layer management entity */

        /**
         * dev_found - Notification of a found P2P Device
         * @ctx: Callback context from cb_ctx
         * @addr: Source address of the message triggering this notification
         * @info: P2P peer information
         * @new_device: Inform if the peer is newly found
         *
         * This callback is used to notify that a new P2P Device has been
         * found. This may happen, e.g., during Search state based on scan
         * results or during Listen state based on receive Probe Request and
         * Group Owner Negotiation Request.
         */
        void (*dev_found)(void *ctx, const u8 *addr,
                          const struct p2p_peer_info *info,
                          int new_device);

        /**
         * dev_lost - Notification of a lost P2P Device
         * @ctx: Callback context from cb_ctx
         * @dev_addr: P2P Device Address of the lost P2P Device
         *
         * This callback is used to notify that a P2P Device has been deleted.
         */
        void (*dev_lost)(void *ctx, const u8 *dev_addr);

        /**
         * find_stopped - Notification of a p2p_find operation stopping
         * @ctx: Callback context from cb_ctx
         */
        void (*find_stopped)(void *ctx);

        /**
         * go_neg_req_rx - Notification of a receive GO Negotiation Request
         * @ctx: Callback context from cb_ctx
         * @src: Source address of the message triggering this notification
         * @dev_passwd_id: WPS Device Password ID
         *
         * This callback is used to notify that a P2P Device is requesting
         * group owner negotiation with us, but we do not have all the
         * necessary information to start GO Negotiation. This indicates that
         * the local user has not authorized the connection yet by providing a
         * PIN or PBC button press. This information can be provided with a
         * call to p2p_connect().
         */
        void (*go_neg_req_rx)(void *ctx, const u8 *src, u16 dev_passwd_id);

        /**
         * go_neg_completed - Notification of GO Negotiation results
         * @ctx: Callback context from cb_ctx
         * @res: GO Negotiation results
         *
         * This callback is used to notify that Group Owner Negotiation has
         * been completed. Non-zero struct p2p_go_neg_results::status indicates
         * failed negotiation. In case of success, this function is responsible
         * for creating a new group interface (or using the existing interface
         * depending on driver features), setting up the group interface in
         * proper mode based on struct p2p_go_neg_results::role_go and
         * initializing WPS provisioning either as a Registrar (if GO) or as an
         * Enrollee. Successful WPS provisioning must be indicated by calling
         * p2p_wps_success_cb(). The callee is responsible for timing out group
         * formation if WPS provisioning cannot be completed successfully
         * within 15 seconds.
         */
        void (*go_neg_completed)(void *ctx, struct p2p_go_neg_results *res);

        /**
         * sd_request - Callback on Service Discovery Request
         * @ctx: Callback context from cb_ctx
         * @freq: Frequency (in MHz) of the channel
         * @sa: Source address of the request
         * @dialog_token: Dialog token
         * @update_indic: Service Update Indicator from the source of request
         * @tlvs: P2P Service Request TLV(s)
         * @tlvs_len: Length of tlvs buffer in octets
         *
         * This callback is used to indicate reception of a service discovery
         * request. Response to the query must be indicated by calling
         * p2p_sd_response() with the context information from the arguments to
         * this callback function.
         *
         * This callback handler can be set to %NULL to indicate that service
         * discovery is not supported.
         */
        void (*sd_request)(void *ctx, int freq, const u8 *sa, u8 dialog_token,
                           u16 update_indic, const u8 *tlvs, size_t tlvs_len);

        /**
         * sd_response - Callback on Service Discovery Response
         * @ctx: Callback context from cb_ctx
         * @sa: Source address of the request
         * @update_indic: Service Update Indicator from the source of response
         * @tlvs: P2P Service Response TLV(s)
         * @tlvs_len: Length of tlvs buffer in octets
         *
         * This callback is used to indicate reception of a service discovery
         * response. This callback handler can be set to %NULL if no service
         * discovery requests are used. The information provided with this call
         * is replies to the queries scheduled with p2p_sd_request().
         */
        void (*sd_response)(void *ctx, const u8 *sa, u16 update_indic,
                            const u8 *tlvs, size_t tlvs_len);

        /**
         * prov_disc_req - Callback on Provisiong Discovery Request
         * @ctx: Callback context from cb_ctx
         * @peer: Source address of the request
         * @config_methods: Requested WPS Config Method
         * @dev_addr: P2P Device Address of the found P2P Device
         * @pri_dev_type: Primary Device Type
         * @dev_name: Device Name
         * @supp_config_methods: Supported configuration Methods
         * @dev_capab: Device Capabilities
         * @group_capab: Group Capabilities
         * @group_id: P2P Group ID (or %NULL if not included)
         * @group_id_len: Length of P2P Group ID
         *
         * This callback is used to indicate reception of a Provision Discovery
         * Request frame that the P2P module accepted.
         */
        void (*prov_disc_req)(void *ctx, const u8 *peer, u16 config_methods,
                              const u8 *dev_addr, const u8 *pri_dev_type,
                              const char *dev_name, u16 supp_config_methods,
                              u8 dev_capab, u8 group_capab,
                              const u8 *group_id, size_t group_id_len);

        /**
         * prov_disc_resp - Callback on Provisiong Discovery Response
         * @ctx: Callback context from cb_ctx
         * @peer: Source address of the response
         * @config_methods: Value from p2p_prov_disc_req() or 0 on failure
         *
         * This callback is used to indicate reception of a Provision Discovery
         * Response frame for a pending request scheduled with
         * p2p_prov_disc_req(). This callback handler can be set to %NULL if
         * provision discovery is not used.
         */
        void (*prov_disc_resp)(void *ctx, const u8 *peer, u16 config_methods);

        /**
         * prov_disc_fail - Callback on Provision Discovery failure
         * @ctx: Callback context from cb_ctx
         * @peer: Source address of the response
         * @status: Cause of failure, will not be %P2P_PROV_DISC_SUCCESS
         *
         * This callback is used to indicate either a failure or no response
         * to an earlier provision discovery request.
         *
         * This callback handler can be set to %NULL if provision discovery
         * is not used or failures do not need to be indicated.
         */
        void (*prov_disc_fail)(void *ctx, const u8 *peer,
                               enum p2p_prov_disc_status status);

        /**
         * invitation_process - Optional callback for processing Invitations
         * @ctx: Callback context from cb_ctx
         * @sa: Source address of the Invitation Request
         * @bssid: P2P Group BSSID from the request or %NULL if not included
         * @go_dev_addr: GO Device Address from P2P Group ID
         * @ssid: SSID from P2P Group ID
         * @ssid_len: Length of ssid buffer in octets
         * @go: Variable for returning whether the local end is GO in the group
         * @group_bssid: Buffer for returning P2P Group BSSID (if local end GO)
         * @force_freq: Variable for returning forced frequency for the group
         * @persistent_group: Whether this is an invitation to reinvoke a
         *      persistent group (instead of invitation to join an active
         *      group)
         * @channels: Available operating channels for the group
         * @dev_pw_id: Device Password ID for NFC static handover or -1 if not
         *      used
         * Returns: Status code (P2P_SC_*)
         *
         * This optional callback can be used to implement persistent reconnect
         * by allowing automatic restarting of persistent groups without user
         * interaction. If this callback is not implemented (i.e., is %NULL),
         * the received Invitation Request frames are replied with
         * %P2P_SC_REQ_RECEIVED status and indicated to upper layer with the
         * invitation_result() callback.
         *
         * If the requested parameters are acceptable and the group is known,
         * %P2P_SC_SUCCESS may be returned. If the requested group is unknown,
         * %P2P_SC_FAIL_UNKNOWN_GROUP should be returned. %P2P_SC_REQ_RECEIVED
         * can be returned if there is not enough data to provide immediate
         * response, i.e., if some sort of user interaction is needed. The
         * invitation_received() callback will be called in that case
         * immediately after this call.
         */
        u8 (*invitation_process)(void *ctx, const u8 *sa, const u8 *bssid,
                                 const u8 *go_dev_addr, const u8 *ssid,
                                 size_t ssid_len, int *go, u8 *group_bssid,
                                 int *force_freq, int persistent_group,
                                 const struct p2p_channels *channels,
                                 int dev_pw_id);

        /**
         * invitation_received - Callback on Invitation Request RX
         * @ctx: Callback context from cb_ctx
         * @sa: Source address of the Invitation Request
         * @bssid: P2P Group BSSID or %NULL if not received
         * @ssid: SSID of the group
         * @ssid_len: Length of ssid in octets
         * @go_dev_addr: GO Device Address
         * @status: Response Status
         * @op_freq: Operational frequency for the group
         *
         * This callback is used to indicate sending of an Invitation Response
         * for a received Invitation Request. If status == 0 (success), the
         * upper layer code is responsible for starting the group. status == 1
         * indicates need to get user authorization for the group. Other status
         * values indicate that the invitation request was rejected.
         */
        void (*invitation_received)(void *ctx, const u8 *sa, const u8 *bssid,
                                    const u8 *ssid, size_t ssid_len,
                                    const u8 *go_dev_addr, u8 status,
                                    int op_freq);

        /**
         * invitation_result - Callback on Invitation result
         * @ctx: Callback context from cb_ctx
         * @status: Negotiation result (Status Code)
         * @bssid: P2P Group BSSID or %NULL if not received
         * @channels: Available operating channels for the group
         * @addr: Peer address
         * @freq: Frequency (in MHz) indicated during invitation or 0
         * @peer_oper_freq: Operating frequency (in MHz) advertized by the peer
         * during invitation or 0
         *
         * This callback is used to indicate result of an Invitation procedure
         * started with a call to p2p_invite(). The indicated status code is
         * the value received from the peer in Invitation Response with 0
         * (P2P_SC_SUCCESS) indicating success or -1 to indicate a timeout or a
         * local failure in transmitting the Invitation Request.
         */
        void (*invitation_result)(void *ctx, int status, const u8 *bssid,
                                  const struct p2p_channels *channels,
                                  const u8 *addr, int freq, int peer_oper_freq);

        /**
         * go_connected - Check whether we are connected to a GO
         * @ctx: Callback context from cb_ctx
         * @dev_addr: P2P Device Address of a GO
         * Returns: 1 if we are connected as a P2P client to the specified GO
         * or 0 if not.
         */
        int (*go_connected)(void *ctx, const u8 *dev_addr);

        /**
         * presence_resp - Callback on Presence Response
         * @ctx: Callback context from cb_ctx
         * @src: Source address (GO's P2P Interface Address)
         * @status: Result of the request (P2P_SC_*)
         * @noa: Returned NoA value
         * @noa_len: Length of the NoA buffer in octets
         */
        void (*presence_resp)(void *ctx, const u8 *src, u8 status,
                              const u8 *noa, size_t noa_len);

        /**
         * is_concurrent_session_active - Check whether concurrent session is
         * active on other virtual interfaces
         * @ctx: Callback context from cb_ctx
         * Returns: 1 if concurrent session is active on other virtual interface
         * or 0 if not.
         */
        int (*is_concurrent_session_active)(void *ctx);

        /**
         * is_p2p_in_progress - Check whether P2P operation is in progress
         * @ctx: Callback context from cb_ctx
         * Returns: 1 if P2P operation (e.g., group formation) is in progress
         * or 0 if not.
         */
        int (*is_p2p_in_progress)(void *ctx);
};


/* P2P module initialization/deinitialization */

/**
 * p2p_init - Initialize P2P module
 * @cfg: P2P module configuration
 * Returns: Pointer to private data or %NULL on failure
 *
 * This function is used to initialize global P2P module context (one per
 * device). The P2P module will keep a copy of the configuration data, so the
 * caller does not need to maintain this structure. However, the callback
 * functions and the context parameters to them must be kept available until
 * the P2P module is deinitialized with p2p_deinit().
 */
struct p2p_data * p2p_init(const struct p2p_config *cfg);

/**
 * p2p_deinit - Deinitialize P2P module
 * @p2p: P2P module context from p2p_init()
 */
void p2p_deinit(struct p2p_data *p2p);

/**
 * p2p_flush - Flush P2P module state
 * @p2p: P2P module context from p2p_init()
 *
 * This command removes the P2P module state like peer device entries.
 */
void p2p_flush(struct p2p_data *p2p);

/**
 * p2p_unauthorize - Unauthorize the specified peer device
 * @p2p: P2P module context from p2p_init()
 * @addr: P2P peer entry to be unauthorized
 * Returns: 0 on success, -1 on failure
 *
 * This command removes any connection authorization from the specified P2P
 * peer device address. This can be used, e.g., to cancel effect of a previous
 * p2p_authorize() or p2p_connect() call that has not yet resulted in completed
 * GO Negotiation.
 */
int p2p_unauthorize(struct p2p_data *p2p, const u8 *addr);

/**
 * p2p_set_dev_name - Set device name
 * @p2p: P2P module context from p2p_init()
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to update the P2P module configuration with
 * information that was not available at the time of the p2p_init() call.
 */
int p2p_set_dev_name(struct p2p_data *p2p, const char *dev_name);

int p2p_set_manufacturer(struct p2p_data *p2p, const char *manufacturer);
int p2p_set_model_name(struct p2p_data *p2p, const char *model_name);
int p2p_set_model_number(struct p2p_data *p2p, const char *model_number);
int p2p_set_serial_number(struct p2p_data *p2p, const char *serial_number);

void p2p_set_config_methods(struct p2p_data *p2p, u16 config_methods);
void p2p_set_uuid(struct p2p_data *p2p, const u8 *uuid);

/**
 * p2p_set_pri_dev_type - Set primary device type
 * @p2p: P2P module context from p2p_init()
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to update the P2P module configuration with
 * information that was not available at the time of the p2p_init() call.
 */
int p2p_set_pri_dev_type(struct p2p_data *p2p, const u8 *pri_dev_type);

/**
 * p2p_set_sec_dev_types - Set secondary device types
 * @p2p: P2P module context from p2p_init()
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to update the P2P module configuration with
 * information that was not available at the time of the p2p_init() call.
 */
int p2p_set_sec_dev_types(struct p2p_data *p2p, const u8 dev_types[][8],
                          size_t num_dev_types);

int p2p_set_country(struct p2p_data *p2p, const char *country);


/* Commands from upper layer management entity */

enum p2p_discovery_type {
        P2P_FIND_START_WITH_FULL,
        P2P_FIND_ONLY_SOCIAL,
        P2P_FIND_PROGRESSIVE
};

/**
 * p2p_find - Start P2P Find (Device Discovery)
 * @p2p: P2P module context from p2p_init()
 * @timeout: Timeout for find operation in seconds or 0 for no timeout
 * @type: Device Discovery type
 * @num_req_dev_types: Number of requested device types
 * @req_dev_types: Requested device types array, must be an array
 *      containing num_req_dev_types * WPS_DEV_TYPE_LEN bytes; %NULL if no
 *      requested device types.
 * @dev_id: Device ID to search for or %NULL to find all devices
 * @search_delay: Extra delay in milliseconds between search iterations
 * Returns: 0 on success, -1 on failure
 */
int p2p_find(struct p2p_data *p2p, unsigned int timeout,
             enum p2p_discovery_type type,
             unsigned int num_req_dev_types, const u8 *req_dev_types,
             const u8 *dev_id, unsigned int search_delay);

/**
 * p2p_notify_scan_trigger_status - Indicate scan trigger status
 * @p2p: P2P module context from p2p_init()
 * @status: 0 on success, -1 on failure
 */
void p2p_notify_scan_trigger_status(struct p2p_data *p2p, int status);

/**
 * p2p_stop_find - Stop P2P Find (Device Discovery)
 * @p2p: P2P module context from p2p_init()
 */
void p2p_stop_find(struct p2p_data *p2p);

/**
 * p2p_stop_find_for_freq - Stop P2P Find for next oper on specific freq
 * @p2p: P2P module context from p2p_init()
 * @freq: Frequency in MHz for next operation
 *
 * This is like p2p_stop_find(), but Listen state is not stopped if we are
 * already on the same frequency.
 */
void p2p_stop_find_for_freq(struct p2p_data *p2p, int freq);

/**
 * p2p_listen - Start P2P Listen state for specified duration
 * @p2p: P2P module context from p2p_init()
 * @timeout: Listen state duration in milliseconds
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to request the P2P module to keep the device
 * discoverable on the listen channel for an extended set of time. At least in
 * its current form, this is mainly used for testing purposes and may not be of
 * much use for normal P2P operations.
 */
int p2p_listen(struct p2p_data *p2p, unsigned int timeout);

/**
 * p2p_stop_listen - Stop P2P Listen
 * @p2p: P2P module context from p2p_init()
 */
void p2p_stop_listen(struct p2p_data *p2p);

/**
 * p2p_connect - Start P2P group formation (GO negotiation)
 * @p2p: P2P module context from p2p_init()
 * @peer_addr: MAC address of the peer P2P client
 * @wps_method: WPS method to be used in provisioning
 * @go_intent: Local GO intent value (1..15)
 * @own_interface_addr: Intended interface address to use with the group
 * @force_freq: The only allowed channel frequency in MHz or 0
 * @persistent_group: Whether to create a persistent group (0 = no, 1 =
 * persistent group without persistent reconnect, 2 = persistent group with
 * persistent reconnect)
 * @force_ssid: Forced SSID for the group if we become GO or %NULL to generate
 *      a new SSID
 * @force_ssid_len: Length of $force_ssid buffer
 * @pd_before_go_neg: Whether to send Provision Discovery prior to GO
 *      Negotiation as an interoperability workaround when initiating group
 *      formation
 * @pref_freq: Preferred operating frequency in MHz or 0 (this is only used if
 *      force_freq == 0)
 * Returns: 0 on success, -1 on failure
 */
int p2p_connect(struct p2p_data *p2p, const u8 *peer_addr,
                enum p2p_wps_method wps_method,
                int go_intent, const u8 *own_interface_addr,
                unsigned int force_freq, int persistent_group,
                const u8 *force_ssid, size_t force_ssid_len,
                int pd_before_go_neg, unsigned int pref_freq, u16 oob_pw_id);

/**
 * p2p_authorize - Authorize P2P group formation (GO negotiation)
 * @p2p: P2P module context from p2p_init()
 * @peer_addr: MAC address of the peer P2P client
 * @wps_method: WPS method to be used in provisioning
 * @go_intent: Local GO intent value (1..15)
 * @own_interface_addr: Intended interface address to use with the group
 * @force_freq: The only allowed channel frequency in MHz or 0
 * @persistent_group: Whether to create a persistent group (0 = no, 1 =
 * persistent group without persistent reconnect, 2 = persistent group with
 * persistent reconnect)
 * @force_ssid: Forced SSID for the group if we become GO or %NULL to generate
 *      a new SSID
 * @force_ssid_len: Length of $force_ssid buffer
 * @pref_freq: Preferred operating frequency in MHz or 0 (this is only used if
 *      force_freq == 0)
 * Returns: 0 on success, -1 on failure
 *
 * This is like p2p_connect(), but the actual group negotiation is not
 * initiated automatically, i.e., the other end is expected to do that.
 */
int p2p_authorize(struct p2p_data *p2p, const u8 *peer_addr,
                  enum p2p_wps_method wps_method,
                  int go_intent, const u8 *own_interface_addr,
                  unsigned int force_freq, int persistent_group,
                  const u8 *force_ssid, size_t force_ssid_len,
                  unsigned int pref_freq, u16 oob_pw_id);

/**
 * p2p_reject - Reject peer device (explicitly block connection attempts)
 * @p2p: P2P module context from p2p_init()
 * @peer_addr: MAC address of the peer P2P client
 * Returns: 0 on success, -1 on failure
 */
int p2p_reject(struct p2p_data *p2p, const u8 *peer_addr);

/**
 * p2p_prov_disc_req - Send Provision Discovery Request
 * @p2p: P2P module context from p2p_init()
 * @peer_addr: MAC address of the peer P2P client
 * @config_methods: WPS Config Methods value (only one bit set)
 * @join: Whether this is used by a client joining an active group
 * @force_freq: Forced TX frequency for the frame (mainly for the join case)
 * @user_initiated_pd: Flag to indicate if initiated by user or not
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to request a discovered P2P peer to display a PIN
 * (config_methods = WPS_CONFIG_DISPLAY) or be prepared to enter a PIN from us
 * (config_methods = WPS_CONFIG_KEYPAD). The Provision Discovery Request frame
 * is transmitted once immediately and if no response is received, the frame
 * will be sent again whenever the target device is discovered during device
 * dsicovery (start with a p2p_find() call). Response from the peer is
 * indicated with the p2p_config::prov_disc_resp() callback.
 */
int p2p_prov_disc_req(struct p2p_data *p2p, const u8 *peer_addr,
                      u16 config_methods, int join, int force_freq,
                      int user_initiated_pd);

/**
 * p2p_sd_request - Schedule a service discovery query
 * @p2p: P2P module context from p2p_init()
 * @dst: Destination peer or %NULL to apply for all peers
 * @tlvs: P2P Service Query TLV(s)
 * Returns: Reference to the query or %NULL on failure
 *
 * Response to the query is indicated with the p2p_config::sd_response()
 * callback.
 */
void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst,
                      const struct wpabuf *tlvs);

#ifdef CONFIG_WIFI_DISPLAY
void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst,
                          const struct wpabuf *tlvs);
#endif /* CONFIG_WIFI_DISPLAY */

/**
 * p2p_sd_cancel_request - Cancel a pending service discovery query
 * @p2p: P2P module context from p2p_init()
 * @req: Query reference from p2p_sd_request()
 * Returns: 0 if request for cancelled; -1 if not found
 */
int p2p_sd_cancel_request(struct p2p_data *p2p, void *req);

/**
 * p2p_sd_response - Send response to a service discovery query
 * @p2p: P2P module context from p2p_init()
 * @freq: Frequency from p2p_config::sd_request() callback
 * @dst: Destination address from p2p_config::sd_request() callback
 * @dialog_token: Dialog token from p2p_config::sd_request() callback
 * @resp_tlvs: P2P Service Response TLV(s)
 *
 * This function is called as a response to the request indicated with
 * p2p_config::sd_request() callback.
 */
void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst,
                     u8 dialog_token, const struct wpabuf *resp_tlvs);

/**
 * p2p_sd_service_update - Indicate a change in local services
 * @p2p: P2P module context from p2p_init()
 *
 * This function needs to be called whenever there is a change in availability
 * of the local services. This will increment the Service Update Indicator
 * value which will be used in SD Request and Response frames.
 */
void p2p_sd_service_update(struct p2p_data *p2p);


enum p2p_invite_role {
        P2P_INVITE_ROLE_GO,
        P2P_INVITE_ROLE_ACTIVE_GO,
        P2P_INVITE_ROLE_CLIENT
};

/**
 * p2p_invite - Invite a P2P Device into a group
 * @p2p: P2P module context from p2p_init()
 * @peer: Device Address of the peer P2P Device
 * @role: Local role in the group
 * @bssid: Group BSSID or %NULL if not known
 * @ssid: Group SSID
 * @ssid_len: Length of ssid in octets
 * @force_freq: The only allowed channel frequency in MHz or 0
 * @go_dev_addr: Forced GO Device Address or %NULL if none
 * @persistent_group: Whether this is to reinvoke a persistent group
 * @pref_freq: Preferred operating frequency in MHz or 0 (this is only used if
 *      force_freq == 0)
 * @dev_pw_id: Device Password ID from OOB Device Password (NFC) static handover
 *      case or -1 if not used
 * Returns: 0 on success, -1 on failure
 */
int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role,
               const u8 *bssid, const u8 *ssid, size_t ssid_len,
               unsigned int force_freq, const u8 *go_dev_addr,
               int persistent_group, unsigned int pref_freq, int dev_pw_id);

/**
 * p2p_presence_req - Request GO presence
 * @p2p: P2P module context from p2p_init()
 * @go_interface_addr: GO P2P Interface Address
 * @own_interface_addr: Own P2P Interface Address for this group
 * @freq: Group operating frequence (in MHz)
 * @duration1: Preferred presence duration in microseconds
 * @interval1: Preferred presence interval in microseconds
 * @duration2: Acceptable presence duration in microseconds
 * @interval2: Acceptable presence interval in microseconds
 * Returns: 0 on success, -1 on failure
 *
 * If both duration and interval values are zero, the parameter pair is not
 * specified (i.e., to remove Presence Request, use duration1 = interval1 = 0).
 */
int p2p_presence_req(struct p2p_data *p2p, const u8 *go_interface_addr,
                     const u8 *own_interface_addr, unsigned int freq,
                     u32 duration1, u32 interval1, u32 duration2,
                     u32 interval2);

/**
 * p2p_ext_listen - Set Extended Listen Timing
 * @p2p: P2P module context from p2p_init()
 * @freq: Group operating frequence (in MHz)
 * @period: Availability period in milliseconds (1-65535; 0 to disable)
 * @interval: Availability interval in milliseconds (1-65535; 0 to disable)
 * Returns: 0 on success, -1 on failure
 *
 * This function can be used to enable or disable (period = interval = 0)
 * Extended Listen Timing. When enabled, the P2P Device will become
 * discoverable (go into Listen State) every @interval milliseconds for at
 * least @period milliseconds.
 */
int p2p_ext_listen(struct p2p_data *p2p, unsigned int period,
                   unsigned int interval);

/* Event notifications from upper layer management operations */

/**
 * p2p_wps_success_cb - Report successfully completed WPS provisioning
 * @p2p: P2P module context from p2p_init()
 * @mac_addr: Peer address
 *
 * This function is used to report successfully completed WPS provisioning
 * during group formation in both GO/Registrar and client/Enrollee roles.
 */
void p2p_wps_success_cb(struct p2p_data *p2p, const u8 *mac_addr);

/**
 * p2p_group_formation_failed - Report failed WPS provisioning
 * @p2p: P2P module context from p2p_init()
 *
 * This function is used to report failed group formation. This can happen
 * either due to failed WPS provisioning or due to 15 second timeout during
 * the provisioning phase.
 */
void p2p_group_formation_failed(struct p2p_data *p2p);

/**
 * p2p_get_provisioning_info - Get any stored provisioning info
 * @p2p: P2P module context from p2p_init()
 * @addr: Peer P2P Device Address
 * Returns: WPS provisioning information (WPS config method) or 0 if no
 * information is available
 *
 * This function is used to retrieve stored WPS provisioning info for the given
 * peer.
 */
u16 p2p_get_provisioning_info(struct p2p_data *p2p, const u8 *addr);

/**
 * p2p_clear_provisioning_info - Clear any stored provisioning info
 * @p2p: P2P module context from p2p_init()
 * @iface_addr: Peer P2P Device Address
 *
 * This function is used to clear stored WPS provisioning info for the given
 * peer.
 */
void p2p_clear_provisioning_info(struct p2p_data *p2p, const u8 *addr);


/* Event notifications from lower layer driver operations */

/**
 * enum p2p_probe_req_status
 *
 * @P2P_PREQ_MALFORMED: frame was not well-formed
 * @P2P_PREQ_NOT_LISTEN: device isn't in listen state, frame ignored
 * @P2P_PREQ_NOT_P2P: frame was not a P2P probe request
 * @P2P_PREQ_P2P_NOT_PROCESSED: frame was P2P but wasn't processed
 * @P2P_PREQ_P2P_PROCESSED: frame has been processed by P2P
 */
enum p2p_probe_req_status {
        P2P_PREQ_MALFORMED,
        P2P_PREQ_NOT_LISTEN,
        P2P_PREQ_NOT_P2P,
        P2P_PREQ_NOT_PROCESSED,
        P2P_PREQ_PROCESSED
};

/**
 * p2p_probe_req_rx - Report reception of a Probe Request frame
 * @p2p: P2P module context from p2p_init()
 * @addr: Source MAC address
 * @dst: Destination MAC address if available or %NULL
 * @bssid: BSSID if available or %NULL
 * @ie: Information elements from the Probe Request frame body
 * @ie_len: Length of ie buffer in octets
 * Returns: value indicating the type and status of the probe request
 */
enum p2p_probe_req_status
p2p_probe_req_rx(struct p2p_data *p2p, const u8 *addr, const u8 *dst,
                 const u8 *bssid, const u8 *ie, size_t ie_len);

/**
 * p2p_rx_action - Report received Action frame
 * @p2p: P2P module context from p2p_init()
 * @da: Destination address of the received Action frame
 * @sa: Source address of the received Action frame
 * @bssid: Address 3 of the received Action frame
 * @category: Category of the received Action frame
 * @data: Action frame body after the Category field
 * @len: Length of the data buffer in octets
 * @freq: Frequency (in MHz) on which the frame was received
 */
void p2p_rx_action(struct p2p_data *p2p, const u8 *da, const u8 *sa,
                   const u8 *bssid, u8 category,
                   const u8 *data, size_t len, int freq);

/**
 * p2p_scan_res_handler - Indicate a P2P scan results
 * @p2p: P2P module context from p2p_init()
 * @bssid: BSSID of the scan result
 * @freq: Frequency of the channel on which the device was found in MHz
 * @rx_time: Time when the result was received
 * @level: Signal level (signal strength of the received Beacon/Probe Response
 *      frame)
 * @ies: Pointer to IEs from the scan result
 * @ies_len: Length of the ies buffer
 * Returns: 0 to continue or 1 to stop scan result indication
 *
 * This function is called to indicate a scan result entry with P2P IE from a
 * scan requested with struct p2p_config::p2p_scan(). This can be called during
 * the actual scan process (i.e., whenever a new device is found) or as a
 * sequence of calls after the full scan has been completed. The former option
 * can result in optimized operations, but may not be supported by all
 * driver/firmware designs. The ies buffer need to include at least the P2P IE,
 * but it is recommended to include all IEs received from the device. The
 * caller does not need to check that the IEs contain a P2P IE before calling
 * this function since frames will be filtered internally if needed.
 *
 * This function will return 1 if it wants to stop scan result iteration (and
 * scan in general if it is still in progress). This is used to allow faster
 * start of a pending operation, e.g., to start a pending GO negotiation.
 */
int p2p_scan_res_handler(struct p2p_data *p2p, const u8 *bssid, int freq,
                         struct os_reltime *rx_time, int level, const u8 *ies,
                         size_t ies_len);

/**
 * p2p_scan_res_handled - Indicate end of scan results
 * @p2p: P2P module context from p2p_init()
 *
 * This function is called to indicate that all P2P scan results from a scan
 * have been reported with zero or more calls to p2p_scan_res_handler(). This
 * function must be called as a response to successful
 * struct p2p_config::p2p_scan() call if none of the p2p_scan_res_handler()
 * calls stopped iteration.
 */
void p2p_scan_res_handled(struct p2p_data *p2p);

enum p2p_send_action_result {
        P2P_SEND_ACTION_SUCCESS /* Frame was send and acknowledged */,
        P2P_SEND_ACTION_NO_ACK /* Frame was sent, but not acknowledged */,
        P2P_SEND_ACTION_FAILED /* Frame was not sent due to a failure */
};

/**
 * p2p_send_action_cb - Notify TX status of an Action frame
 * @p2p: P2P module context from p2p_init()
 * @freq: Channel frequency in MHz
 * @dst: Destination MAC address (Address 1)
 * @src: Source MAC address (Address 2)
 * @bssid: BSSID (Address 3)
 * @result: Result of the transmission attempt
 *
 * This function is used to indicate the result of an Action frame transmission
 * that was requested with struct p2p_config::send_action() callback.
 */
void p2p_send_action_cb(struct p2p_data *p2p, unsigned int freq, const u8 *dst,
                        const u8 *src, const u8 *bssid,
                        enum p2p_send_action_result result);

/**
 * p2p_listen_cb - Indicate the start of a requested Listen state
 * @p2p: P2P module context from p2p_init()
 * @freq: Listen channel frequency in MHz
 * @duration: Duration for the Listen state in milliseconds
 *
 * This function is used to indicate that a Listen state requested with
 * struct p2p_config::start_listen() callback has started.
 */
void p2p_listen_cb(struct p2p_data *p2p, unsigned int freq,
                   unsigned int duration);

/**
 * p2p_listen_end - Indicate the end of a requested Listen state
 * @p2p: P2P module context from p2p_init()
 * @freq: Listen channel frequency in MHz
 * Returns: 0 if no operations were started, 1 if an operation was started
 *
 * This function is used to indicate that a Listen state requested with
 * struct p2p_config::start_listen() callback has ended.
 */
int p2p_listen_end(struct p2p_data *p2p, unsigned int freq);

void p2p_deauth_notif(struct p2p_data *p2p, const u8 *bssid, u16 reason_code,
                      const u8 *ie, size_t ie_len);

void p2p_disassoc_notif(struct p2p_data *p2p, const u8 *bssid, u16 reason_code,
                        const u8 *ie, size_t ie_len);


/* Per-group P2P state for GO */

struct p2p_group;

/**
 * struct p2p_group_config - P2P group configuration
 *
 * This configuration is provided to the P2P module during initialization of
 * the per-group information with p2p_group_init().
 */
struct p2p_group_config {
        /**
         * persistent_group - Whether the group is persistent
         * 0 = not a persistent group
         * 1 = persistent group without persistent reconnect
         * 2 = persistent group with persistent reconnect
         */
        int persistent_group;

        /**
         * interface_addr - P2P Interface Address of the group
         */
        u8 interface_addr[ETH_ALEN];

        /**
         * max_clients - Maximum number of clients in the group
         */
        unsigned int max_clients;

        /**
         * ssid - Group SSID
         */
        u8 ssid[32];

        /**
         * ssid_len - Length of SSID
         */
        size_t ssid_len;

        /**
         * freq - Operating channel of the group
         */
        int freq;

        /**
         * cb_ctx - Context to use with callback functions
         */
        void *cb_ctx;

        /**
         * ie_update - Notification of IE update
         * @ctx: Callback context from cb_ctx
         * @beacon_ies: P2P IE for Beacon frames or %NULL if no change
         * @proberesp_ies: P2P Ie for Probe Response frames
         *
         * P2P module uses this callback function to notify whenever the P2P IE
         * in Beacon or Probe Response frames should be updated based on group
         * events.
         *
         * The callee is responsible for freeing the returned buffer(s) with
         * wpabuf_free().
         */
        void (*ie_update)(void *ctx, struct wpabuf *beacon_ies,
                          struct wpabuf *proberesp_ies);

        /**
         * idle_update - Notification of changes in group idle state
         * @ctx: Callback context from cb_ctx
         * @idle: Whether the group is idle (no associated stations)
         */
        void (*idle_update)(void *ctx, int idle);
};

/**
 * p2p_group_init - Initialize P2P group
 * @p2p: P2P module context from p2p_init()
 * @config: P2P group configuration (will be freed by p2p_group_deinit())
 * Returns: Pointer to private data or %NULL on failure
 *
 * This function is used to initialize per-group P2P module context. Currently,
 * this is only used to manage GO functionality and P2P clients do not need to
 * create an instance of this per-group information.
 */
struct p2p_group * p2p_group_init(struct p2p_data *p2p,
                                  struct p2p_group_config *config);

/**
 * p2p_group_deinit - Deinitialize P2P group
 * @group: P2P group context from p2p_group_init()
 */
void p2p_group_deinit(struct p2p_group *group);

/**
 * p2p_group_notif_assoc - Notification of P2P client association with GO
 * @group: P2P group context from p2p_group_init()
 * @addr: Interface address of the P2P client
 * @ie: IEs from the (Re)association Request frame
 * @len: Length of the ie buffer in octets
 * Returns: 0 on success, -1 on failure
 */
int p2p_group_notif_assoc(struct p2p_group *group, const u8 *addr,
                          const u8 *ie, size_t len);

/**
 * p2p_group_assoc_resp_ie - Build P2P IE for (re)association response
 * @group: P2P group context from p2p_group_init()
 * @status: Status value (P2P_SC_SUCCESS if association succeeded)
 * Returns: P2P IE for (Re)association Response or %NULL on failure
 *
 * The caller is responsible for freeing the returned buffer with
 * wpabuf_free().
 */
struct wpabuf * p2p_group_assoc_resp_ie(struct p2p_group *group, u8 status);

/**
 * p2p_group_notif_disassoc - Notification of P2P client disassociation from GO
 * @group: P2P group context from p2p_group_init()
 * @addr: Interface address of the P2P client
 */
void p2p_group_notif_disassoc(struct p2p_group *group, const u8 *addr);

/**
 * p2p_group_notif_formation_done - Notification of completed group formation
 * @group: P2P group context from p2p_group_init()
 */
void p2p_group_notif_formation_done(struct p2p_group *group);

/**
 * p2p_group_notif_noa - Notification of NoA change
 * @group: P2P group context from p2p_group_init()
 * @noa: Notice of Absence attribute payload, %NULL if none
 * @noa_len: Length of noa buffer in octets
 * Returns: 0 on success, -1 on failure
 *
 * Notify the P2P group management about a new NoA contents. This will be
 * inserted into the P2P IEs in Beacon and Probe Response frames with rest of
 * the group information.
 */
int p2p_group_notif_noa(struct p2p_group *group, const u8 *noa,
                        size_t noa_len);

/**
 * p2p_group_match_dev_type - Match device types in group with requested type
 * @group: P2P group context from p2p_group_init()
 * @wps: WPS TLVs from Probe Request frame (concatenated WPS IEs)
 * Returns: 1 on match, 0 on mismatch
 *
 * This function can be used to match the Requested Device Type attribute in
 * WPS IE with the device types of a group member for deciding whether a GO
 * should reply to a Probe Request frame. Match will be reported if the WPS IE
 * is not requested any specific device type.
 */
int p2p_group_match_dev_type(struct p2p_group *group, struct wpabuf *wps);

/**
 * p2p_group_match_dev_id - Match P2P Device Address in group with requested device id
 */
int p2p_group_match_dev_id(struct p2p_group *group, struct wpabuf *p2p);

/**
 * p2p_group_go_discover - Send GO Discoverability Request to a group client
 * @group: P2P group context from p2p_group_init()
 * Returns: 0 on success (frame scheduled); -1 if client was not found
 */
int p2p_group_go_discover(struct p2p_group *group, const u8 *dev_id,
                          const u8 *searching_dev, int rx_freq);


/* Generic helper functions */

/**
 * p2p_ie_text - Build text format description of P2P IE
 * @p2p_ie: P2P IE
 * @buf: Buffer for returning text
 * @end: Pointer to the end of the buf area
 * Returns: Number of octets written to the buffer or -1 on failure
 *
 * This function can be used to parse P2P IE contents into text format
 * field=value lines.
 */
int p2p_ie_text(struct wpabuf *p2p_ie, char *buf, char *end);

/**
 * p2p_scan_result_text - Build text format description of P2P IE
 * @ies: Information elements from scan results
 * @ies_len: ies buffer length in octets
 * @buf: Buffer for returning text
 * @end: Pointer to the end of the buf area
 * Returns: Number of octets written to the buffer or -1 on failure
 *
 * This function can be used to parse P2P IE contents into text format
 * field=value lines.
 */
int p2p_scan_result_text(const u8 *ies, size_t ies_len, char *buf, char *end);

/**
 * p2p_parse_dev_addr_in_p2p_ie - Parse P2P Device Address from a concatenated
 * P2P IE
 * @p2p_ie: P2P IE
 * @dev_addr: Buffer for returning P2P Device Address
 * Returns: 0 on success or -1 if P2P Device Address could not be parsed
 */
int p2p_parse_dev_addr_in_p2p_ie(struct wpabuf *p2p_ie, u8 *dev_addr);

/**
 * p2p_parse_dev_addr - Parse P2P Device Address from P2P IE(s)
 * @ies: Information elements from scan results
 * @ies_len: ies buffer length in octets
 * @dev_addr: Buffer for returning P2P Device Address
 * Returns: 0 on success or -1 if P2P Device Address could not be parsed
 */
int p2p_parse_dev_addr(const u8 *ies, size_t ies_len, u8 *dev_addr);

/**
 * p2p_assoc_req_ie - Build P2P IE for (Re)Association Request frame
 * @p2p: P2P module context from p2p_init()
 * @bssid: BSSID
 * @buf: Buffer for writing the P2P IE
 * @len: Maximum buf length in octets
 * @p2p_group: Whether this is for association with a P2P GO
 * @p2p_ie: Reassembled P2P IE data from scan results or %NULL if none
 * Returns: Number of octets written into buf or -1 on failure
 */
int p2p_assoc_req_ie(struct p2p_data *p2p, const u8 *bssid, u8 *buf,
                     size_t len, int p2p_group, struct wpabuf *p2p_ie);

/**
 * p2p_scan_ie - Build P2P IE for Probe Request
 * @p2p: P2P module context from p2p_init()
 * @ies: Buffer for writing P2P IE
 * @dev_id: Device ID to search for or %NULL for any
 */
void p2p_scan_ie(struct p2p_data *p2p, struct wpabuf *ies, const u8 *dev_id);

/**
 * p2p_scan_ie_buf_len - Get maximum buffer length needed for p2p_scan_ie
 * @p2p: P2P module context from p2p_init()
 * Returns: Number of octets that p2p_scan_ie() may add to the buffer
 */
size_t p2p_scan_ie_buf_len(struct p2p_data *p2p);

/**
 * p2p_go_params - Generate random P2P group parameters
 * @p2p: P2P module context from p2p_init()
 * @params: Buffer for parameters
 * Returns: 0 on success, -1 on failure
 */
int p2p_go_params(struct p2p_data *p2p, struct p2p_go_neg_results *params);

/**
 * p2p_get_group_capab - Get Group Capability from P2P IE data
 * @p2p_ie: P2P IE(s) contents
 * Returns: Group Capability
 */
u8 p2p_get_group_capab(const struct wpabuf *p2p_ie);

/**
 * p2p_get_cross_connect_disallowed - Does WLAN AP disallows cross connection
 * @p2p_ie: P2P IE(s) contents
 * Returns: 0 if cross connection is allow, 1 if not
 */
int p2p_get_cross_connect_disallowed(const struct wpabuf *p2p_ie);

/**
 * p2p_get_go_dev_addr - Get P2P Device Address from P2P IE data
 * @p2p_ie: P2P IE(s) contents
 * Returns: Pointer to P2P Device Address or %NULL if not included
 */
const u8 * p2p_get_go_dev_addr(const struct wpabuf *p2p_ie);

/**
 * p2p_get_peer_info - Get P2P peer information
 * @p2p: P2P module context from p2p_init()
 * @addr: P2P Device Address of the peer or %NULL to indicate the first peer
 * @next: Whether to select the peer entry following the one indicated by addr
 * Returns: Pointer to peer info or %NULL if not found
 */
const struct p2p_peer_info * p2p_get_peer_info(struct p2p_data *p2p,
                                               const u8 *addr, int next);

/**
 * p2p_get_peer_info_txt - Get internal P2P peer information in text format
 * @info: Pointer to P2P peer info from p2p_get_peer_info()
 * @buf: Buffer for returning text
 * @buflen: Maximum buffer length
 * Returns: Number of octets written to the buffer or -1 on failure
 *
 * Note: This information is internal to the P2P module and subject to change.
 * As such, this should not really be used by external programs for purposes
 * other than debugging.
 */
int p2p_get_peer_info_txt(const struct p2p_peer_info *info,
                          char *buf, size_t buflen);

/**
 * p2p_peer_known - Check whether P2P peer is known
 * @p2p: P2P module context from p2p_init()
 * @addr: P2P Device Address of the peer
 * Returns: 1 if the specified device is in the P2P peer table or 0 if not
 */
int p2p_peer_known(struct p2p_data *p2p, const u8 *addr);

/**
 * p2p_set_client_discoverability - Set client discoverability capability
 * @p2p: P2P module context from p2p_init()
 * @enabled: Whether client discoverability will be enabled
 *
 * This function can be used to disable (and re-enable) client discoverability.
 * This capability is enabled by default and should not be disabled in normal
 * use cases, i.e., this is mainly for testing purposes.
 */
void p2p_set_client_discoverability(struct p2p_data *p2p, int enabled);

/**
 * p2p_set_managed_oper - Set managed P2P Device operations capability
 * @p2p: P2P module context from p2p_init()
 * @enabled: Whether managed P2P Device operations will be enabled
 */
void p2p_set_managed_oper(struct p2p_data *p2p, int enabled);

/**
 * p2p_config_get_random_social - Return a random social channel
 * @p2p: P2P config
 * @op_class: Selected operating class
 * @op_channel: Selected social channel
 * Returns: 0 on success, -1 on failure
 *
 * This function is used before p2p_init is called. A random social channel
 * from supports bands 2.4 GHz (channels 1,6,11) and 60 GHz (channel 2) is
 * returned on success.
 */
int p2p_config_get_random_social(struct p2p_config *p2p, u8 *op_class,
                                 u8 *op_channel);

int p2p_set_listen_channel(struct p2p_data *p2p, u8 reg_class, u8 channel,
                           u8 forced);

u8 p2p_get_listen_channel(struct p2p_data *p2p);

int p2p_set_ssid_postfix(struct p2p_data *p2p, const u8 *postfix, size_t len);

int p2p_get_interface_addr(struct p2p_data *p2p, const u8 *dev_addr,
                           u8 *iface_addr);
int p2p_get_dev_addr(struct p2p_data *p2p, const u8 *iface_addr,
                           u8 *dev_addr);

void p2p_set_peer_filter(struct p2p_data *p2p, const u8 *addr);

/**
 * p2p_set_cross_connect - Set cross connection capability
 * @p2p: P2P module context from p2p_init()
 * @enabled: Whether cross connection will be enabled
 */
void p2p_set_cross_connect(struct p2p_data *p2p, int enabled);

int p2p_get_oper_freq(struct p2p_data *p2p, const u8 *iface_addr);

/**
 * p2p_set_intra_bss_dist - Set intra BSS distribution
 * @p2p: P2P module context from p2p_init()
 * @enabled: Whether intra BSS distribution will be enabled
 */
void p2p_set_intra_bss_dist(struct p2p_data *p2p, int enabled);

int p2p_channels_includes_freq(const struct p2p_channels *channels,
                               unsigned int freq);

int p2p_channels_to_freqs(const struct p2p_channels *channels,
                          int *freq_list, unsigned int max_len);

/**
 * p2p_supported_freq - Check whether channel is supported for P2P
 * @p2p: P2P module context from p2p_init()
 * @freq: Channel frequency in MHz
 * Returns: 0 if channel not usable for P2P, 1 if usable for P2P
 */
int p2p_supported_freq(struct p2p_data *p2p, unsigned int freq);

/**
 * p2p_supported_freq_go - Check whether channel is supported for P2P GO operation
 * @p2p: P2P module context from p2p_init()
 * @freq: Channel frequency in MHz
 * Returns: 0 if channel not usable for P2P, 1 if usable for P2P
 */
int p2p_supported_freq_go(struct p2p_data *p2p, unsigned int freq);

/**
 * p2p_supported_freq_cli - Check whether channel is supported for P2P client operation
 * @p2p: P2P module context from p2p_init()
 * @freq: Channel frequency in MHz
 * Returns: 0 if channel not usable for P2P, 1 if usable for P2P
 */
int p2p_supported_freq_cli(struct p2p_data *p2p, unsigned int freq);

/**
 * p2p_get_pref_freq - Get channel from preferred channel list
 * @p2p: P2P module context from p2p_init()
 * @channels: List of channels
 * Returns: Preferred channel
 */
unsigned int p2p_get_pref_freq(struct p2p_data *p2p,
                               const struct p2p_channels *channels);

void p2p_update_channel_list(struct p2p_data *p2p,
                             const struct p2p_channels *chan,
                             const struct p2p_channels *cli_chan);

/**
 * p2p_set_best_channels - Update best channel information
 * @p2p: P2P module context from p2p_init()
 * @freq_24: Frequency (MHz) of best channel in 2.4 GHz band
 * @freq_5: Frequency (MHz) of best channel in 5 GHz band
 * @freq_overall: Frequency (MHz) of best channel overall
 */
void p2p_set_best_channels(struct p2p_data *p2p, int freq_24, int freq_5,
                           int freq_overall);

/**
 * p2p_set_own_freq_preference - Set own preference for channel
 * @p2p: P2P module context from p2p_init()
 * @freq: Frequency (MHz) of the preferred channel or 0 if no preference
 *
 * This function can be used to set a preference on the operating channel based
 * on frequencies used on the other virtual interfaces that share the same
 * radio. If non-zero, this is used to try to avoid multi-channel concurrency.
 */
void p2p_set_own_freq_preference(struct p2p_data *p2p, int freq);

const u8 * p2p_get_go_neg_peer(struct p2p_data *p2p);

/**
 * p2p_get_group_num_members - Get number of members in group
 * @group: P2P group context from p2p_group_init()
 * Returns: Number of members in the group
 */
unsigned int p2p_get_group_num_members(struct p2p_group *group);

/**
 * p2p_iterate_group_members - Iterate group members
 * @group: P2P group context from p2p_group_init()
 * @next: iteration pointer, must be a pointer to a void * that is set to %NULL
 *      on the first call and not modified later
 * Returns: A P2P Device Address for each call and %NULL for no more members
 */
const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next);

/**
 * p2p_group_get_dev_addr - Get a P2P Device Address of a client in a group
 * @group: P2P group context from p2p_group_init()
 * @addr: P2P Interface Address of the client
 * Returns: P2P Device Address of the client if found or %NULL if no match
 * found
 */
const u8 * p2p_group_get_dev_addr(struct p2p_group *group, const u8 *addr);

/**
 * p2p_group_is_client_connected - Check whether a specific client is connected
 * @group: P2P group context from p2p_group_init()
 * @addr: P2P Device Address of the client
 * Returns: 1 if client is connected or 0 if not
 */
int p2p_group_is_client_connected(struct p2p_group *group, const u8 *dev_addr);

/**
 * p2p_group_get_config - Get the group configuration
 * @group: P2P group context from p2p_group_init()
 * Returns: The group configuration pointer
 */
const struct p2p_group_config * p2p_group_get_config(struct p2p_group *group);

/**
 * p2p_loop_on_all_groups - Run the given callback on all groups
 * @p2p: P2P module context from p2p_init()
 * @group_callback: The callback function pointer
 * @user_data: Some user data pointer which can be %NULL
 *
 * The group_callback function can stop the iteration by returning 0.
 */
void p2p_loop_on_all_groups(struct p2p_data *p2p,
                            int (*group_callback)(struct p2p_group *group,
                                                  void *user_data),
                            void *user_data);

/**
 * p2p_get_peer_found - Get P2P peer info structure of a found peer
 * @p2p: P2P module context from p2p_init()
 * @addr: P2P Device Address of the peer or %NULL to indicate the first peer
 * @next: Whether to select the peer entry following the one indicated by addr
 * Returns: The first P2P peer info available or %NULL if no such peer exists
 */
const struct p2p_peer_info *
p2p_get_peer_found(struct p2p_data *p2p, const u8 *addr, int next);

/**
 * p2p_remove_wps_vendor_extensions - Remove WPS vendor extensions
 * @p2p: P2P module context from p2p_init()
 */
void p2p_remove_wps_vendor_extensions(struct p2p_data *p2p);

/**
 * p2p_add_wps_vendor_extension - Add a WPS vendor extension
 * @p2p: P2P module context from p2p_init()
 * @vendor_ext: The vendor extensions to add
 * Returns: 0 on success, -1 on failure
 *
 * The wpabuf structures in the array are owned by the P2P
 * module after this call.
 */
int p2p_add_wps_vendor_extension(struct p2p_data *p2p,
                                 const struct wpabuf *vendor_ext);

/**
 * p2p_set_oper_channel - Set the P2P operating channel
 * @p2p: P2P module context from p2p_init()
 * @op_reg_class: Operating regulatory class to set
 * @op_channel: operating channel to set
 * @cfg_op_channel : Whether op_channel is hardcoded in configuration
 * Returns: 0 on success, -1 on failure
 */
int p2p_set_oper_channel(struct p2p_data *p2p, u8 op_reg_class, u8 op_channel,
                         int cfg_op_channel);

/**
 * p2p_set_pref_chan - Set P2P preferred channel list
 * @p2p: P2P module context from p2p_init()
 * @num_pref_chan: Number of entries in pref_chan list
 * @pref_chan: Preferred channels or %NULL to remove preferences
 * Returns: 0 on success, -1 on failure
 */
int p2p_set_pref_chan(struct p2p_data *p2p, unsigned int num_pref_chan,
                      const struct p2p_channel *pref_chan);

/**
 * p2p_set_no_go_freq - Set no GO channel ranges
 * @p2p: P2P module context from p2p_init()
 * @list: Channel ranges or %NULL to remove restriction
 * Returns: 0 on success, -1 on failure
 */
int p2p_set_no_go_freq(struct p2p_data *p2p,
                       const struct wpa_freq_range_list *list);

/**
 * p2p_in_progress - Check whether a P2P operation is progress
 * @p2p: P2P module context from p2p_init()
 * Returns: 0 if P2P module is idle, 1 if an operation is in progress but not
 * in search state, or 2 if search state operation is in progress
 */
int p2p_in_progress(struct p2p_data *p2p);

const char * p2p_wps_method_text(enum p2p_wps_method method);

/**
 * p2p_set_config_timeout - Set local config timeouts
 * @p2p: P2P module context from p2p_init()
 * @go_timeout: Time in 10 ms units it takes to start the GO mode
 * @client_timeout: Time in 10 ms units it takes to start the client mode
 */
void p2p_set_config_timeout(struct p2p_data *p2p, u8 go_timeout,
                            u8 client_timeout);

int p2p_set_wfd_ie_beacon(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_probe_req(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_probe_resp(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_assoc_req(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_invitation(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_prov_disc_req(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_prov_disc_resp(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_ie_go_neg(struct p2p_data *p2p, struct wpabuf *ie);
int p2p_set_wfd_dev_info(struct p2p_data *p2p, const struct wpabuf *elem);
int p2p_set_wfd_assoc_bssid(struct p2p_data *p2p, const struct wpabuf *elem);
int p2p_set_wfd_coupled_sink_info(struct p2p_data *p2p,
                                  const struct wpabuf *elem);
struct wpabuf * wifi_display_encaps(struct wpabuf *subelems);

/**
 * p2p_set_disc_int - Set min/max discoverable interval for p2p_find
 * @p2p: P2P module context from p2p_init()
 * @min_disc_int: minDiscoverableInterval (in units of 100 TU); default 1
 * @max_disc_int: maxDiscoverableInterval (in units of 100 TU); default 3
 * @max_disc_tu: Maximum number of TUs (1.024 ms) for discoverable interval; or
 *      -1 not to limit
 * Returns: 0 on success, or -1 on failure
 *
 * This function can be used to configure minDiscoverableInterval and
 * maxDiscoverableInterval parameters for the Listen state during device
 * discovery (p2p_find). A random number of 100 TU units is picked for each
 * Listen state iteration from [min_disc_int,max_disc_int] range.
 *
 * max_disc_tu can be used to futher limit the discoverable duration. However,
 * it should be noted that use of this parameter is not recommended since it
 * would not be compliant with the P2P specification.
 */
int p2p_set_disc_int(struct p2p_data *p2p, int min_disc_int, int max_disc_int,
                     int max_disc_tu);

/**
 * p2p_get_state_txt - Get current P2P state for debug purposes
 * @p2p: P2P module context from p2p_init()
 * Returns: Name of the current P2P module state
 *
 * It should be noted that the P2P module state names are internal information
 * and subject to change at any point, i.e., this information should be used
 * mainly for debugging purposes.
 */
const char * p2p_get_state_txt(struct p2p_data *p2p);

struct wpabuf * p2p_build_nfc_handover_req(struct p2p_data *p2p,
                                           int client_freq,
                                           const u8 *go_dev_addr,
                                           const u8 *ssid, size_t ssid_len);
struct wpabuf * p2p_build_nfc_handover_sel(struct p2p_data *p2p,
                                           int client_freq,
                                           const u8 *go_dev_addr,
                                           const u8 *ssid, size_t ssid_len);

struct p2p_nfc_params {
        int sel;
        const u8 *wsc_attr;
        size_t wsc_len;
        const u8 *p2p_attr;
        size_t p2p_len;

        enum {
                NO_ACTION, JOIN_GROUP, AUTH_JOIN, INIT_GO_NEG, RESP_GO_NEG,
                BOTH_GO, PEER_CLIENT
        } next_step;
        struct p2p_peer_info *peer;
        u8 oob_dev_pw[WPS_OOB_PUBKEY_HASH_LEN + 2 +
                      WPS_OOB_DEVICE_PASSWORD_LEN];
        size_t oob_dev_pw_len;
        int go_freq;
        u8 go_dev_addr[ETH_ALEN];
        u8 go_ssid[32];
        size_t go_ssid_len;
};

int p2p_process_nfc_connection_handover(struct p2p_data *p2p,
                                        struct p2p_nfc_params *params);

void p2p_set_authorized_oob_dev_pw_id(struct p2p_data *p2p, u16 dev_pw_id,
                                      int go_intent,
                                      const u8 *own_interface_addr);

int p2p_set_passphrase_len(struct p2p_data *p2p, unsigned int len);

void p2p_loop_on_known_peers(struct p2p_data *p2p,
                             void (*peer_callback)(struct p2p_peer_info *peer,
                                                   void *user_data),
                             void *user_data);

void p2p_set_vendor_elems(struct p2p_data *p2p, struct wpabuf **vendor_elem);

#endif /* P2P_H */