P2P: Embed publically visible struct in peer info

[thirdparty/hostap.git] / src / p2p / p2p.h

/*
 * Wi-Fi Direct - P2P module
 * Copyright (c) 2009-2010, Atheros Communications
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#ifndef P2P_H
#define P2P_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_LABEL, WPS_PIN_DISPLAY, WPS_PIN_KEYPAD, WPS_PBC
};

/**
 * 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;

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

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

	/**
	 * 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
	 */
	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_SPECIFIC,
	P2P_SCAN_SOCIAL_PLUS_ONE
};

/**
 * 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
	 */
	char device_name[33];

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

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

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

/**
 * 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;

	/**
	 * 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;

	/**
	 * 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];

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

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

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

	/**
	 * 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;

	/**
	 * msg_ctx - Context to use with wpa_msg() calls
	 */
	void *msg_ctx;

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


	/* 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
	 * 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_SPECIFIC
	 * request a scan of a single channel specified by freq.
	 * @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);

	/**
	 * 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
	 *
	 * 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);

	/**
	 * 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
	 *
	 * 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);

	/**
	 * 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);

	/**
	 * 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)
	 * 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);

	/**
	 * 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
	 *
	 * 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);
};


/* 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);

/**
 * 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
 * Returns: 0 on success, -1 on failure
 */
int p2p_find(struct p2p_data *p2p, unsigned int timeout,
	     enum p2p_discovery_type type);

/**
 * 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_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
 * 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);

/**
 * 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
 * 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);

/**
 * 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
 * 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);

/**
 * 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);

/**
 * 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
 * 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);

/**
 * 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);


/* Event notifications from lower layer driver operations */

/**
 * p2p_probe_req_rx - Report reception of a Probe Request frame
 * @p2p: P2P module context from p2p_init()
 * @addr: Source MAC address
 * @ie: Information elements from the Probe Request frame body
 * @ie_len: Length of ie buffer in octets
 * Returns: 0 to indicate the frame was not processed or 1 if it was
 */
int p2p_probe_req_rx(struct p2p_data *p2p, const u8 *addr, 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
 * @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,
			 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
	 */
	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;

	/**
	 * 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_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_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
 */
void p2p_scan_ie(struct p2p_data *p2p, struct wpabuf *ies);

/**
 * 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 in text format
 * @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
 * @buf: Buffer for returning text
 * @buflen: Maximum buffer length
 * Returns: Number of octets written to the buffer or -1 on failure
 */
int p2p_get_peer_info(struct p2p_data *p2p, const u8 *addr, int next,
		      char *buf, size_t buflen);

/**
 * 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);

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

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);

int p2p_add_device(struct p2p_data *p2p, const u8 *addr, int freq, int level,
		   const u8 *ies, size_t ies_len);

/**
 * 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);

/**
 * 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);

void p2p_update_channel_list(struct p2p_data *p2p, struct p2p_channels *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);

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 Interface Address for each call and %NULL for no more members
 */
const u8 * p2p_iterate_group_members(struct p2p_group *group, void **next);

#endif /* P2P_H */