iwd/src/p2p.c

/*
 *
 *  Wireless daemon for Linux
 *
 *  Copyright (C) 2020  Intel Corporation. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <linux/rtnetlink.h>
#include <linux/if_ether.h>
#include <unistd.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/if.h>

#include <ell/ell.h>

#include "linux/nl80211.h"

#include "ell/useful.h"
#include "src/missing.h"
#include "src/iwd.h"
#include "src/wiphy.h"
#include "src/scan.h"
#include "src/p2putil.h"
#include "src/ie.h"
#include "src/util.h"
#include "src/dbus.h"
#include "src/netdev.h"
#include "src/mpdu.h"
#include "src/common.h"
#include "src/wsc.h"
#include "src/handshake.h"
#include "src/crypto.h"
#include "src/module.h"
#include "src/frame-xchg.h"
#include "src/nl80211util.h"
#include "src/netconfig.h"
#include "src/ap.h"
#include "src/p2p.h"
#include "src/band.h"

struct p2p_device {
	uint64_t wdev_id;
	uint8_t addr[6];
	struct l_genl_family *nl80211;
	struct wiphy *wiphy;
	unsigned int connections_left;
	struct p2p_capability_attr capability;
	struct p2p_device_info_attr device_info;
	uint32_t start_stop_cmd_id;
	l_dbus_property_complete_cb_t pending_complete;
	struct l_dbus_message *pending_message;

	uint8_t listen_country[3];
	uint8_t listen_oper_class;
	uint32_t listen_channel;
	unsigned int scan_interval;
	time_t next_scan_ts;
	struct l_timeout *scan_timeout;
	uint32_t scan_id;
	unsigned int chans_per_scan;
	unsigned int scan_chan_idx;
	uint64_t roc_cookie;
	unsigned int listen_duration;
	struct l_queue *discovery_users;
	struct l_queue *peer_list;
	unsigned int next_tie_breaker;

	struct p2p_peer *conn_peer;
	uint16_t conn_config_method;
	char *conn_pin;
	uint8_t conn_addr[6];
	uint16_t conn_password_id;
	unsigned int conn_num;
	struct scan_bss *conn_wsc_bss;
	struct netdev *conn_netdev;
	uint32_t conn_netdev_watch_id;
	uint32_t conn_new_intf_cmd_id;
	struct wsc_enrollee *conn_enrollee;
	struct netconfig *conn_netconfig;
	struct l_settings *conn_netconfig_settings;
	struct l_timeout *conn_dhcp_timeout;
	char *conn_peer_ip;
	struct p2p_wfd_properties *conn_own_wfd;
	uint8_t conn_psk[32];
	int conn_retry_count;

	struct l_timeout *conn_peer_config_timeout;
	unsigned long conn_config_delay;
	struct l_timeout *conn_go_neg_req_timeout;
	uint8_t conn_go_dialog_token;
	unsigned int conn_go_scan_retry;
	uint32_t conn_go_oper_freq;
	uint8_t conn_peer_interface_addr[6];
	struct p2p_capability_attr conn_peer_capability;
	struct p2p_device_info_attr conn_peer_dev_info;

	struct p2p_group_id_attr go_group_id;
	struct ap_state *group;

	bool enabled : 1;
	bool have_roc_cookie : 1;
	/*
	 * We need to track @disconnecting because while a connect action is
	 * always triggered by a DBus message, meaning that @pending_message
	 * is going to be non-NULL, a disconnect may also be a result of an
	 * error at a layer higher than netdev and may last until
	 * netdev_disconnect, or similar, finishes.
	 */
	bool disconnecting : 1;
	bool is_go : 1;
	bool conn_go_tie_breaker : 1;
	bool conn_peer_added : 1;
};

struct p2p_discovery_user {
	char *client;
	struct p2p_device *dev;
	unsigned int disconnect_watch;
};

struct p2p_peer {
	struct scan_bss *bss;
	struct p2p_device *dev;
	struct wsc_dbus wsc;
	char *name;
	struct wsc_primary_device_type primary_device_type;
	const uint8_t *device_addr;
	struct p2p_wfd_properties *wfd;
	/* Whether peer is currently a GO */
	bool group;
};

struct p2p_wfd_properties {
	bool available;
	bool source;
	bool sink;
	uint16_t port;
	uint16_t throughput;
	bool audio;
	bool uibc;
	bool cp;
	bool r2;
	uint16_t raw_dev_info;
	uint8_t associated_bssid[6];
	uint8_t raw_coupled_sink_status;
	uint8_t coupled_sink_mac[6];
};

static struct l_queue *p2p_device_list;
static unsigned int p2p_dhcp_timeout_val;
static struct l_settings *p2p_dhcp_settings;
static struct p2p_wfd_properties *p2p_own_wfd;
static unsigned int p2p_wfd_disconnect_watch;

/*
 * For now we only scan the common 2.4GHz channels, to be replaced with
 * a query of actual allowed channels per band and reg-domain.
 */
static const int channels_social[] = { 1, 6, 11 };
static const int channels_scan_2_4_other[] = { 2, 3, 4, 5, 7, 8, 9, 10 };

/*
 * The client side generally receives more testing and we know of fewer
 * problematic drivers so set a low default Group Owner intent value.
 */
#define P2P_GO_INTENT 2

static bool p2p_device_match(const void *a, const void *b)
{
	const struct p2p_device *dev = a;
	const uint64_t *wdev_id = b;

	return dev->wdev_id == *wdev_id;
}

struct p2p_device *p2p_device_find(uint64_t wdev_id)
{
	return l_queue_find(p2p_device_list, p2p_device_match, &wdev_id);
}

static const char *p2p_device_get_path(const struct p2p_device *dev)
{
	return wiphy_get_path(dev->wiphy);
}

static bool p2p_discovery_user_match(const void *a, const void *b)
{
	const struct p2p_discovery_user *user = a;

	return !strcmp(user->client, b);
}

static void p2p_discovery_user_free(void *data)
{
	struct p2p_discovery_user *user = data;

	if (user->disconnect_watch)
		l_dbus_remove_watch(dbus_get_bus(), user->disconnect_watch);

	l_free(user->client);
	l_free(user);
}

static inline bool p2p_peer_operational(struct p2p_peer *peer)
{
	return peer && peer->dev->conn_netdev && !peer->dev->disconnecting &&
		((!peer->dev->is_go && !peer->dev->conn_wsc_bss) ||
		 (peer->dev->is_go && peer->dev->conn_peer_added));
}

static bool p2p_peer_match(const void *a, const void *b)
{
	const struct p2p_peer *peer = a;
	const uint8_t *addr = b;

	return !memcmp(peer->bss->addr, addr, 6);
}

static const char *p2p_peer_get_path(const struct p2p_peer *peer)
{
	static char path[256];

	snprintf(path, sizeof(path),
			"%s/p2p_peers/%02x_%02x_%02x_%02x_%02x_%02x",
			p2p_device_get_path(peer->dev),
			peer->bss->addr[0], peer->bss->addr[1],
			peer->bss->addr[2], peer->bss->addr[3],
			peer->bss->addr[4], peer->bss->addr[5]);
	return path;
}

static void p2p_peer_free(void *user_data)
{
	struct p2p_peer *peer = user_data;

	scan_bss_free(peer->bss);
	l_free(peer->wfd);
	l_free(peer->name);
	l_free(peer);
}

static void p2p_peer_put(void *user_data)
{
	struct p2p_peer *peer = user_data;

	/*
	 * Removes all interfaces with one call, no need to call
	 * wsc_dbus_remove_interface.
	 */
	l_dbus_unregister_object(dbus_get_bus(), p2p_peer_get_path(peer));
	p2p_peer_free(peer);
}

static void p2p_device_discovery_start(struct p2p_device *dev);
static void p2p_device_discovery_stop(struct p2p_device *dev);

/* Callers should reserve 32 bytes, 64 with non-NULL @wfd_clients */
static size_t p2p_build_wfd_ie(const struct p2p_wfd_properties *wfd,
				const struct p2p_peer *wfd_client, uint8_t *buf)
{
	/*
	 * Wi-Fi Display Technical Specification v2.1.0
	 * Probe req: Section 5.2.2
	 * Negotiation req: Section 5.2.6.1
	 * Negotiation resp: Section 5.2.6.2
	 * Negotiation confirm: Section 5.2.6.3
	 * Provision disc req: Section 5.2.6.6
	 */
	size_t size = 0;
	uint16_t dev_type =
		wfd->source ? (wfd->sink ? WFD_DEV_INFO_TYPE_DUAL_ROLE :
			WFD_DEV_INFO_TYPE_SOURCE) :
		WFD_DEV_INFO_TYPE_PRIMARY_SINK;

	buf[size++] = IE_TYPE_VENDOR_SPECIFIC;
	size++;			/* IE Data length */
	buf[size++] = wifi_alliance_oui[0];
	buf[size++] = wifi_alliance_oui[1];
	buf[size++] = wifi_alliance_oui[2];
	buf[size++] = 0x0a;	/* OUI Type: WFD */

	buf[size++] = WFD_SUBELEM_WFD_DEVICE_INFORMATION;
	buf[size++] = 0;	/* WFD Subelement length */
	buf[size++] = 6;
	buf[size++] = 0x00;	/* WFD Device Information bitmap: */
	buf[size++] = dev_type |
		(wfd->available ? WFD_DEV_INFO_SESSION_AVAILABLE :
		 WFD_DEV_INFO_SESSION_NOT_AVAILABLE) |
		(wfd->audio ? 0 : WFD_DEV_INFO_NO_AUDIO_AT_PRIMARY_SINK) |
		(wfd->cp ? WFD_DEV_INFO_CONTENT_PROTECTION_SUPPORT : 0);
	buf[size++] = wfd->port >> 8; /* Session Mgmt Ctrl Port */
	buf[size++] = wfd->port & 255;
	buf[size++] = wfd->throughput >> 8; /* Maximum throughput */
	buf[size++] = wfd->throughput & 255;

	if (wfd->uibc) {
		buf[size++] = WFD_SUBELEM_EXTENDED_CAPABILITY;
		buf[size++] = 0;	/* WFD Subelement length */
		buf[size++] = 2;
		buf[size++] = 0x00;	/* WFD Extended Capability Bitmap: */
		buf[size++] = 0x01;	/* UIBC Support */
	}

	/*
	 * Wi-Fi Display Technical Specification v2.1.0 section 5.2.3:
	 * "If a WFD Capable GO has at least one associated client that is
	 * WFD capable, the WFD capable GO shall include the WFD Session
	 * Information subelement in the WFD IE in the Probe Response
	 * frames it transmits."
	 */
	if (wfd_client && !L_WARN_ON(!wfd_client->wfd)) {
		buf[size++] = WFD_SUBELEM_SESION_INFORMATION;
		buf[size++] = 0;		/* WFD Subelement length */
		buf[size++] = 23;
		memcpy(buf + size, wfd_client->device_addr, 6);
		size += 6;
		memcpy(buf + size, wfd_client->wfd->associated_bssid, 6);
		size += 6;
		buf[size++] = wfd_client->wfd->raw_dev_info >> 8;
		buf[size++] = wfd_client->wfd->raw_dev_info & 255;
		buf[size++] = wfd_client->wfd->throughput >> 8;
		buf[size++] = wfd_client->wfd->throughput & 255;
		buf[size++] = wfd_client->wfd->raw_coupled_sink_status;
		memcpy(buf + size, wfd_client->wfd->coupled_sink_mac, 6);
		size += 6;
	}

	if (wfd->r2) {
		buf[size++] = WFD_SUBELEM_R2_DEVICE_INFORMATION;
		buf[size++] = 0;	/* WFD Subelement length */
		buf[size++] = 2;
		buf[size++] = 0x00;	/* WFD R2 Device Information bitmap: */
		buf[size++] = wfd->source ? wfd->sink ? 3 : 0 : 1;
	}

	buf[1] = size - 2;
	return size;
}

static bool p2p_extract_wfd_properties(const uint8_t *ie, size_t ie_size,
					struct p2p_wfd_properties *out)
{
	struct wfd_subelem_iter iter;
	const uint8_t *devinfo = NULL;
	const uint8_t *associated_bssid = NULL;
	const uint8_t *coupled_sink_info = NULL;
	const uint8_t *ext_caps = NULL;
	const uint8_t *r2 = NULL;

	if (!ie)
		return false;

	wfd_subelem_iter_init(&iter, ie, ie_size);

	while (wfd_subelem_iter_next(&iter)) {
		enum wfd_subelem_type type = wfd_subelem_iter_get_type(&iter);
		size_t len = wfd_subelem_iter_get_length(&iter);
		const uint8_t *data = wfd_subelem_iter_get_data(&iter);

		switch (type) {
#define SUBELEM_CHECK(var, expected_len, name)		\
			if (len != expected_len) {	\
				l_debug(name " length wrong in WFD IE");\
				return false;		\
			}				\
							\
			if (var) {			\
				l_debug("Duplicate" name " in WFD IE");\
				return false;		\
			}				\
							\
			var = data;
		case WFD_SUBELEM_WFD_DEVICE_INFORMATION:
			SUBELEM_CHECK(devinfo, 6, "Device Information");
			break;
		case WFD_SUBELEM_ASSOCIATED_BSSID:
			SUBELEM_CHECK(associated_bssid, 6, "Associated BSSID");
			break;
		case WFD_SUBELEM_COUPLED_SINK_INFORMATION:
			SUBELEM_CHECK(coupled_sink_info, 7,
					"Coupled Sink Information");
			break;
		case WFD_SUBELEM_EXTENDED_CAPABILITY:
			SUBELEM_CHECK(ext_caps, 2, "Extended Capability");
			break;
		case WFD_SUBELEM_R2_DEVICE_INFORMATION:
			SUBELEM_CHECK(r2, 2, "R2 Device Information");
			break;
#undef SUBELEM_CHECK
		default:
			/* Skip unknown IEs */
			break;
		}
	}

	if (devinfo) {
		uint16_t capability = l_get_be16(devinfo + 0);
		bool source;
		bool sink;
		uint16_t port;

		source = (capability & WFD_DEV_INFO_DEVICE_TYPE) ==
			WFD_DEV_INFO_TYPE_SOURCE ||
			(capability & WFD_DEV_INFO_DEVICE_TYPE) ==
			WFD_DEV_INFO_TYPE_DUAL_ROLE;
		sink = (capability & WFD_DEV_INFO_DEVICE_TYPE) ==
			WFD_DEV_INFO_TYPE_PRIMARY_SINK ||
			(capability & WFD_DEV_INFO_DEVICE_TYPE) ==
			WFD_DEV_INFO_TYPE_DUAL_ROLE;

		if (!source && !sink)
			return false;

		port = l_get_be16(devinfo + 2);

		if (source && port == 0) {
			l_debug("0 port number in WFD IE Device Information");
			return false;
		}

		memset(out, 0, sizeof(*out));
		out->available =
			(capability & WFD_DEV_INFO_SESSION_AVAILABILITY) ==
			WFD_DEV_INFO_SESSION_AVAILABLE;
		out->source = source;
		out->sink = sink;
		out->port = port;
		out->cp = capability & WFD_DEV_INFO_CONTENT_PROTECTION_SUPPORT;
		out->audio = !sink ||
			!(capability & WFD_DEV_INFO_NO_AUDIO_AT_PRIMARY_SINK);
		out->raw_dev_info = l_get_be16(devinfo);
	} else {
		l_error("Device Information missing in WFD IE");
		return false;
	}

	if (associated_bssid)
		memcpy(out->associated_bssid, associated_bssid, 6);

	if (coupled_sink_info) {
		out->raw_coupled_sink_status = coupled_sink_info[0];
		memcpy(out->coupled_sink_mac, coupled_sink_info + 1, 6);
	}

	if (ext_caps && (l_get_be16(ext_caps) & 1))
		out->uibc = 1;

	if (r2) {
		uint8_t role = l_get_be16(r2) & 3;

		if ((out->source && role != 0 && role != 3) ||
				(out->sink && role != 1 && role != 3))
			l_debug("Invalid role in WFD R2 Device Information");
		else
			out->r2 = true;
	}

	return true;
}

static bool p2p_device_validate_conn_wfd(struct p2p_device *dev,
						const uint8_t *ie,
						ssize_t ie_size)
{
	struct p2p_wfd_properties wfd;

	if (!dev->conn_own_wfd)
		return true;

	/*
	 * WFD IEs are optional in Association Request/Response and P2P Public
	 * Action frames for R2 devices and required for R1 devices.
	 * Wi-Fi Display Technical Specification v2.1.0 section 5.2:
	 * "A WFD R2 Device shall include the WFD IE in Beacon, Probe
	 * Request/Response, Association Request/Response and P2P Public Action
	 * frames in order to be interoperable with R1 devices. If a WFD R2
	 * Device discovers that the peer device is also a WFD R2 Device, then
	 * it may include the WFD IE in Association Request/Response and P2P
	 * Public Action frames."
	 */
	if (!ie)
		return dev->conn_own_wfd->r2;

	if (!p2p_extract_wfd_properties(ie, ie_size, &wfd)) {
		l_error("Could not parse the WFD IE contents");
		return false;
	}

	if ((dev->conn_own_wfd->source && !wfd.sink) ||
			(dev->conn_own_wfd->sink && !wfd.source)) {
		l_error("Wrong role in peer's WFD IE");
		return false;
	}

	if (wfd.r2 != dev->conn_own_wfd->r2) {
		l_error("Wrong version in peer's WFD IE");
		return false;
	}

	/*
	 * Ignore the session available state because it's not 100% clear
	 * at what point the peer switches to SESSION_NOT_AVAILABLE in its
	 * Device Information.
	 * But we might want to check that other bits have not changed from
	 * what the peer reported during discovery.
	 * Wi-Fi Display Technical Specification v2.1.0 section 4.5.2.1:
	 * "The content of the WFD Device Information subelement should be
	 * immutable during the period of P2P connection establishment, with
	 * [...] exceptions [...]"
	 */

	return true;
}

/* TODO: convert to iovecs */
static uint8_t *p2p_build_scan_ies(struct p2p_device *dev, uint8_t *buf,
					size_t buf_len, size_t *out_len)
{
	struct p2p_probe_req p2p_info = {};
	struct wsc_probe_request wsc_info = {};
	L_AUTO_FREE_VAR(uint8_t *, p2p_ie) = NULL;
	size_t p2p_ie_size;
	uint8_t *wsc_data;
	size_t wsc_data_size;
	L_AUTO_FREE_VAR(uint8_t *, wsc_ie) = NULL;
	size_t wsc_ie_size;
	uint8_t wfd_ie[32];
	size_t wfd_ie_size;
	const uint8_t *addr;

	p2p_info.capability = dev->capability;
	memcpy(p2p_info.listen_channel.country, dev->listen_country, 3);
	p2p_info.listen_channel.oper_class = dev->listen_oper_class;
	p2p_info.listen_channel.channel_num = dev->listen_channel;

	/*
	 * Note that through an attribute we can also request Group Owners
	 * to send us info on clients within their groups and could also
	 * show those on D-Bus.  Doesn't seem useful at this time but may
	 * be desired at some point.
	 */

	p2p_ie = p2p_build_probe_req(&p2p_info, &p2p_ie_size);
	if (!p2p_ie)
		return NULL;

	wsc_info.version2 = true;
	wsc_info.request_type = WSC_REQUEST_TYPE_ENROLLEE_INFO;
	wsc_info.config_methods = dev->device_info.wsc_config_methods;

	/*
	 * If we're doing the provisioning scan, we need to use the same UUID-E
	 * that we'll use in the WSC enrollee registration protocol because the
	 * GO might validate it.
	 */
	addr = dev->conn_peer ? dev->conn_addr : dev->addr;

	if (!wsc_uuid_from_addr(addr, wsc_info.uuid_e))
		return NULL;

	wsc_info.primary_device_type = dev->device_info.primary_device_type;
	wsc_info.rf_bands = WSC_RF_BAND_2_4_GHZ;
	wsc_info.association_state = WSC_ASSOCIATION_STATE_NOT_ASSOCIATED;
	wsc_info.configuration_error = WSC_CONFIGURATION_ERROR_NO_ERROR;
	wsc_info.device_password_id = WSC_DEVICE_PASSWORD_ID_DEFAULT;
	l_strlcpy(wsc_info.device_name, dev->device_info.device_name,
			sizeof(wsc_info.device_name));

	wsc_data = wsc_build_probe_request(&wsc_info, &wsc_data_size);
	if (!wsc_data)
		return NULL;

	wsc_ie = ie_tlv_encapsulate_wsc_payload(wsc_data, wsc_data_size,
						&wsc_ie_size);
	l_free(wsc_data);

	if (!wsc_ie)
		return NULL;

	if (p2p_own_wfd)
		wfd_ie_size = p2p_build_wfd_ie(p2p_own_wfd, NULL, wfd_ie);
	else
		wfd_ie_size = 0;

	if (buf_len < wsc_ie_size + p2p_ie_size + wfd_ie_size)
		return NULL;

	memcpy(buf + 0, wsc_ie, wsc_ie_size);
	memcpy(buf + wsc_ie_size, p2p_ie, p2p_ie_size);

	if (wfd_ie_size)
		memcpy(buf + wsc_ie_size + p2p_ie_size, wfd_ie, wfd_ie_size);

	*out_len = wsc_ie_size + p2p_ie_size + wfd_ie_size;
	return buf;
}

static void p2p_connection_reset(struct p2p_device *dev)
{
	struct p2p_peer *peer = dev->conn_peer;

	if (!peer)
		return;

	/*
	 * conn_peer is currently not refcounted and we make sure it's always
	 * on the dev->peer_list so we can just drop our reference.  Since we
	 * may not have been scanning for a while, don't drop the peer object
	 * now just because it's not been seen in scan results recently, its
	 * age will be checked on the next scan.
	 */
	dev->conn_peer = NULL;
	dev->disconnecting = false;
	dev->connections_left++;

	if (dev->conn_pin) {
		explicit_bzero(dev->conn_pin, strlen(dev->conn_pin));
		l_free(dev->conn_pin);
		dev->conn_pin = NULL;
	}

	l_dbus_property_changed(dbus_get_bus(), p2p_device_get_path(dev),
				IWD_P2P_INTERFACE, "AvailableConnections");

	l_timeout_remove(dev->conn_peer_config_timeout);
	l_timeout_remove(dev->conn_go_neg_req_timeout);
	l_timeout_remove(dev->conn_dhcp_timeout);

	if (dev->conn_netconfig) {
		netconfig_destroy(dev->conn_netconfig);
		dev->conn_netconfig = NULL;
		l_settings_free(dev->conn_netconfig_settings);
	}

	l_free(dev->conn_peer_ip);
	dev->conn_peer_ip = NULL;

	if (dev->conn_new_intf_cmd_id)
		/*
		 * Note this may result in the interface being created
		 * and unused, we don't have its ifindex or wdev_id here
		 * to be able to delete it.  Could use a separate netlink
		 * socket for each connection or disallowing .Disconnect
		 * calls while this command runs.
		 */
		l_genl_family_cancel(dev->nl80211, dev->conn_new_intf_cmd_id);

	if (dev->conn_enrollee)
		wsc_enrollee_cancel(dev->conn_enrollee, false);

	if (dev->group) {
		ap_free(dev->group);
		dev->group = NULL;
		dev->conn_peer_added = false;
	}

	dev->capability.group_caps = 0;

	if (dev->conn_netdev) {
		struct l_genl_msg *msg;
		uint64_t wdev_id = netdev_get_wdev_id(dev->conn_netdev);

		msg = l_genl_msg_new(NL80211_CMD_DEL_INTERFACE);
		l_genl_msg_append_attr(msg, NL80211_ATTR_WDEV, 8, &wdev_id);

		if (!l_genl_family_send(dev->nl80211, msg, NULL, NULL, NULL)) {
			l_genl_msg_unref(msg);
			l_error("Sending DEL_INTERFACE for %s failed",
				netdev_get_name(dev->conn_netdev));
		}

		netdev_destroy(dev->conn_netdev);
		dev->conn_netdev = NULL;
	}

	/*
	 * Removing the netdev above makes sure that both the WSC connection
	 * and the final WPA2 connection (wsc.c and netdev.c) no longer need
	 * the bss so we can free it now -- if it wasn't freed as a result
	 * of wsc_enrollee_cancel or netdev_destroy triggering
	 * p2p_peer_provision_done in the first place.
	 */
	if (dev->conn_wsc_bss) {
		scan_bss_free(dev->conn_wsc_bss);
		dev->conn_wsc_bss = NULL;
	}

	netdev_watch_remove(dev->conn_netdev_watch_id);

	frame_watch_group_remove(dev->wdev_id, FRAME_GROUP_P2P_CONNECT);
	frame_xchg_stop_wdev(dev->wdev_id);

	if (!dev->enabled || (dev->enabled && dev->start_stop_cmd_id)) {
		/*
		 * The device has been disabled in the mean time, all peers
		 * have been removed except this one.  Now it's safe to
		 * drop this peer from the scan results too.
		 */
		l_queue_destroy(dev->peer_list, p2p_peer_put);
		dev->peer_list = NULL;
	}

	if (dev->conn_own_wfd) {
		l_free(dev->conn_own_wfd);
		dev->conn_own_wfd = NULL;

		if (p2p_own_wfd)
			p2p_own_wfd->available = true;
	}

	explicit_bzero(dev->conn_psk, 32);
	dev->conn_retry_count = 0;
	dev->is_go = false;

	if (dev->enabled && !dev->start_stop_cmd_id &&
			!l_queue_isempty(dev->discovery_users))
		p2p_device_discovery_start(dev);
}

static void p2p_connect_failed(struct p2p_device *dev)
{
	struct p2p_peer *peer = dev->conn_peer;

	if (!peer)
		return;

	/* Are we in the scan for the WSC provision bss */
	if (dev->scan_id)
		scan_cancel(dev->wdev_id, dev->scan_id);

	if (l_queue_isempty(dev->discovery_users))
		p2p_device_discovery_stop(dev);

	if (peer->wsc.pending_connect)
		dbus_pending_reply(&peer->wsc.pending_connect,
				dbus_error_failed(peer->wsc.pending_connect));

	p2p_connection_reset(dev);
}

static void p2p_peer_frame_xchg(struct p2p_peer *peer, struct iovec *tx_body,
				const uint8_t *bssid,
				unsigned int retry_interval,
				unsigned int resp_timeout,
				unsigned int retries_on_ack, bool own_channel,
				uint32_t group_id, frame_xchg_cb_t cb, ...)
{
	struct p2p_device *dev = peer->dev;
	struct iovec *frame;
	const struct iovec *iov;
	struct mmpdu_header *header;
	uint8_t header_buf[32] __attribute__ ((aligned));
	int iov_cnt;
	uint32_t freq;
	va_list args;

	/* Header */
	memset(header_buf, 0, sizeof(header_buf));
	header = (void *) header_buf;
	header->fc.protocol_version = 0;
	header->fc.type = MPDU_TYPE_MANAGEMENT;
	header->fc.subtype = MPDU_MANAGEMENT_SUBTYPE_ACTION;
	/* Section 2.4.3 */
	memcpy(header->address_1, peer->device_addr, 6);	/* DA */
	memcpy(header->address_2, dev->addr, 6);		/* SA */
	memcpy(header->address_3, bssid, 6);			/* BSSID */

	for (iov = tx_body, iov_cnt = 0; iov->iov_base; iov++)
		iov_cnt++;

	frame = l_new(struct iovec, iov_cnt + 2);
	frame[0].iov_base = header_buf;
	frame[0].iov_len = (const uint8_t *) mmpdu_body(header) - header_buf;
	memcpy(frame + 1, tx_body, sizeof(struct iovec) * iov_cnt);

	freq = own_channel ?
		band_channel_to_freq(dev->listen_channel, BAND_FREQ_2_4_GHZ) :
		peer->bss->frequency;

	va_start(args, cb);

	frame_xchg_startv(dev->wdev_id, frame, freq,
				retry_interval, resp_timeout, retries_on_ack,
				group_id, cb, dev, NULL, args);
	va_end(args);

	l_free(frame);
}

static const struct frame_xchg_prefix p2p_frame_go_neg_req = {
	/* Management -> Public Action -> P2P -> GO Negotiation Request */
	.frame_type = 0x00d0,
	.data = (uint8_t []) {
		0x04, 0x09, 0x50, 0x6f, 0x9a, 0x09,
		P2P_ACTION_GO_NEGOTIATION_REQ
	},
	.len = 7,
};

static const struct frame_xchg_prefix p2p_frame_go_neg_resp = {
	/* Management -> Public Action -> P2P -> GO Negotiation Response */
	.frame_type = 0x00d0,
	.data = (uint8_t []) {
		0x04, 0x09, 0x50, 0x6f, 0x9a, 0x09,
		P2P_ACTION_GO_NEGOTIATION_RESP
	},
	.len = 7,
};

static const struct frame_xchg_prefix p2p_frame_go_neg_confirm = {
	/* Management -> Public Action -> P2P -> GO Negotiation Confirm */
	.frame_type = 0x00d0,
	.data = (uint8_t []) {
		0x04, 0x09, 0x50, 0x6f, 0x9a, 0x09,
		P2P_ACTION_GO_NEGOTIATION_CONFIRM
	},
	.len = 7,
};

static const struct frame_xchg_prefix p2p_frame_pd_resp = {
	/* Management -> Public Action -> P2P -> Provision Discovery Response */
	.frame_type = 0x00d0,
	.data = (uint8_t []) {
		0x04, 0x09, 0x50, 0x6f, 0x9a, 0x09,
		P2P_ACTION_PROVISION_DISCOVERY_RESP
	},
	.len = 7,
};

static void p2p_peer_connect_done(struct p2p_device *dev)
{
	struct p2p_peer *peer = dev->conn_peer;

	if (!dev->is_go) {
		/* We can free anything potentially needed for a retry */
		scan_bss_free(dev->conn_wsc_bss);
		dev->conn_wsc_bss = NULL;
		explicit_bzero(dev->conn_psk, 32);
	}

	dbus_pending_reply(&peer->wsc.pending_connect,
				l_dbus_message_new_method_return(
						peer->wsc.pending_connect));
	l_dbus_property_changed(dbus_get_bus(),
				p2p_peer_get_path(dev->conn_peer),
				IWD_P2P_PEER_INTERFACE, "Connected");
	l_dbus_property_changed(dbus_get_bus(),
				p2p_peer_get_path(dev->conn_peer),
				IWD_P2P_PEER_INTERFACE,
				"ConnectedInterface");
	l_dbus_property_changed(dbus_get_bus(),
				p2p_peer_get_path(dev->conn_peer),
				IWD_P2P_PEER_INTERFACE,
				"ConnectedIP");
}

static void p2p_group_event(enum ap_event_type type, const void *event_data,
				void *user_data)
{
	struct p2p_device *dev = user_data;

	l_debug("type=%i", type);

	switch (type) {
	case AP_EVENT_START_FAILED:
	case AP_EVENT_STOPPING:
		dev->group = NULL;
		p2p_connect_failed(dev);
		break;

	case AP_EVENT_STARTED:
		ap_push_button(dev->group);
		break;

	case AP_EVENT_STATION_ADDED:
	{
		const struct ap_event_station_added_data *data = event_data;
		L_AUTO_FREE_VAR(uint8_t *, wfd_data) = NULL;
		ssize_t wfd_data_len = 0;
		struct p2p_association_req req_info;
		int r;

		/*
		 * We don't need to validate most of the Association Request
		 * P2P IE contents as we already have all the information there
		 * may be but we need to save some of the attributes because
		 * section 3.2.3 requires that our Group Info includes
		 * specifically the data from the association, not any of the
		 * earlier exchanges:
		 * "When a P2P Client associates with a P2P Group Owner, it
		 * provides [...] the P2P Device Info attribute (see Section
		 * 4.1.15) and the P2P Capability attribute (see Section 4.1.4)
		 * in the P2P IE in the Association Request frame.  This
		 * information shall be used by the P2P Group Owner for Group
		 * Information Advertisement.
		 */
		r = p2p_parse_association_req(data->assoc_ies,
						data->assoc_ies_len, &req_info);
		if (r < 0) {
			l_error("Can't parse P2P Association Request: %s (%i)",
				strerror(-r), -r);
			goto invalid_ie;
		}

		/*
		 * Most of this duplicates the information we already have in
		 * dev->conn_peer.
		 */
		dev->conn_peer_capability = req_info.capability;
		dev->conn_peer_dev_info = req_info.device_info;
		p2p_clear_association_req(&req_info);

		if (dev->conn_own_wfd)
			wfd_data = ie_tlv_extract_wfd_payload(data->assoc_ies,
							data->assoc_ies_len,
							&wfd_data_len);

		if (!p2p_device_validate_conn_wfd(dev, wfd_data,
							wfd_data_len))
			goto invalid_ie;

		/* Take the chance to update WFD attributes for Session Info */
		if (wfd_data)
			p2p_extract_wfd_properties(wfd_data, wfd_data_len,
							dev->conn_peer->wfd);

		/* Setup is progressing so re-arm the timeout */
		l_timeout_modify(dev->conn_dhcp_timeout, p2p_dhcp_timeout_val);
		break;
	}

	case AP_EVENT_STATION_REMOVED:
		dev->conn_peer_added = false;
		p2p_connect_failed(dev);
		break;

	case AP_EVENT_REGISTRATION_START:
		/* Don't validate the P2P IE or WFD IE at this stage */
		break;
	case AP_EVENT_REGISTRATION_SUCCESS:
		/* Update the Group Formation bit in our beacons */
		dev->capability.group_caps &= ~P2P_GROUP_CAP_GROUP_FORMATION;
		ap_update_beacon(dev->group);
		break;
	case AP_EVENT_PBC_MODE_EXIT:
		break;

	case AP_EVENT_DHCP_NEW_LEASE:
	{
		const struct l_dhcp_lease *lease = event_data;

		if (dev->conn_peer_added)
			break;

		l_rtnl_set_linkmode_and_operstate(iwd_get_rtnl(),
					netdev_get_ifindex(dev->conn_netdev),
					IF_LINK_MODE_DEFAULT, IF_OPER_UP,
					NULL, NULL, NULL);

		dev->conn_peer_added = true;
		dev->conn_peer_ip = l_dhcp_lease_get_address(lease);
		l_timeout_remove(dev->conn_dhcp_timeout);
		p2p_peer_connect_done(dev);
		break;
	}

	case AP_EVENT_DHCP_LEASE_EXPIRED:
		/*
		 * Only one DHCP lease allowed for now, as soon as it expires
		 * the connection is considered to be down.
		 */
		p2p_connect_failed(dev);
		break;
	};

	return;

invalid_ie:
	ap_station_disconnect(dev->group, dev->conn_peer_interface_addr,
				MMPDU_REASON_CODE_INVALID_IE);
	p2p_connect_failed(dev);
}

static size_t p2p_group_get_p2p_ie_len(struct p2p_device *dev,
					enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len)
{
	switch (type) {
	case MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_BEACON:
		return 256;
	default:
		return 0;
	}
}

static size_t p2p_group_write_p2p_ie(struct p2p_device *dev,
					enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len,
					uint8_t *out_buf)
{
	L_AUTO_FREE_VAR(uint8_t *, p2p_ie) = NULL;
	size_t p2p_ie_len;

	switch (type) {
	case MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE:
	{
		/*
		 * Wi-Fi P2P Technical Specification v1.7 Section 4.2.5:
		 * "If neither P2P attribute is required according to the
		 * conditions in Table 55, then a P2P IE containing no P2P
		 * attributes is included."
		 * This is going to be our case.
		 */
		struct p2p_association_resp info = {};

		p2p_ie = p2p_build_association_resp(&info, &p2p_ie_len);
		break;
	}

	case MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE:
	{
		L_AUTO_FREE_VAR(uint8_t *, tmp) = NULL;
		struct p2p_probe_resp info = {};
		const struct mmpdu_probe_request *req =
			mmpdu_body(client_frame);
		size_t req_ies_len = (void *) client_frame + client_frame_len -
			(void *) req->ies;
		ssize_t req_p2p_data_size;

		/*
		 * Wi-Fi P2P Technical Specification v1.7 Section 3.2.2:
		 * "A P2P Group Owner shall not include a P2P IE in the Probe
		 * Response frame if the received Probe Request frame does
		 * not contain a P2P IE."
		 */
		tmp = ie_tlv_extract_p2p_payload(req->ies, req_ies_len,
							&req_p2p_data_size);
		if (!tmp)
			return 0;

		info.capability = dev->capability;
		info.device_info = dev->device_info;

		if (dev->conn_peer_added) {
			struct p2p_client_info_descriptor client = {};

			memcpy(client.device_addr,
				dev->conn_peer_dev_info.device_addr, 6);
			memcpy(client.interface_addr,
				dev->conn_peer_interface_addr, 6);
			client.device_caps =
				dev->conn_peer_capability.device_caps;
			client.wsc_config_methods =
				dev->conn_peer_dev_info.wsc_config_methods;
			client.primary_device_type =
				dev->conn_peer_dev_info.primary_device_type;
			l_strlcpy(client.device_name,
					dev->conn_peer_dev_info.device_name,
					sizeof(client.device_name));

			info.group_clients = l_queue_new();
			l_queue_push_tail(info.group_clients,
					l_memdup(&client, sizeof(client)));
		}

		p2p_ie = p2p_build_probe_resp(&info, &p2p_ie_len);
		p2p_clear_probe_resp(&info);
		break;
	}

	case MPDU_MANAGEMENT_SUBTYPE_BEACON:
	{
		struct p2p_beacon info = {};

		info.capability = dev->capability;
		memcpy(info.device_addr, dev->addr, 6);
		p2p_ie = p2p_build_beacon(&info, &p2p_ie_len);
		break;
	}

	default:
		return 0;
	}

	memcpy(out_buf, p2p_ie, p2p_ie_len);
	return p2p_ie_len;
}

static size_t p2p_group_get_wfd_ie_len(struct p2p_device *dev,
					enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len)
{
	switch (type) {
	case MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE:
		return (dev->conn_own_wfd && !dev->conn_own_wfd->r2) ? 32 : 0;
	case MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_BEACON:
		return p2p_own_wfd ? 64 : 0;
	default:
		return 0;
	}
}

static size_t p2p_group_write_wfd_ie(struct p2p_device *dev,
					enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len,
					uint8_t *out_buf)
{
	switch (type) {
	case MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE:
	case MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE:
		if (dev->conn_own_wfd && !dev->conn_own_wfd->r2)
			return p2p_build_wfd_ie(dev->conn_own_wfd, NULL,
						out_buf);

		break;
	case MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE:
		if (p2p_own_wfd)
			return p2p_build_wfd_ie(p2p_own_wfd,
						dev->conn_own_wfd ?
						dev->conn_peer : NULL, out_buf);

		break;
	case MPDU_MANAGEMENT_SUBTYPE_BEACON:
		if (p2p_own_wfd)
			return p2p_build_wfd_ie(p2p_own_wfd, NULL, out_buf);

		break;
	default:
		break;
	}

	return 0;
}

static size_t p2p_group_get_ies_len(enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len,
					void *user_data)
{
	struct p2p_device *dev = user_data;

	return p2p_group_get_p2p_ie_len(dev, type,
					client_frame, client_frame_len) +
		p2p_group_get_wfd_ie_len(dev, type,
						client_frame, client_frame_len);
}

static size_t p2p_group_write_ies(enum mpdu_management_subtype type,
					const struct mmpdu_header *client_frame,
					size_t client_frame_len,
					uint8_t *out_buf, void *user_data)
{
	struct p2p_device *dev = user_data;
	size_t len;

	len = p2p_group_write_p2p_ie(dev, type,
					client_frame, client_frame_len,
					out_buf);
	len += p2p_group_write_wfd_ie(dev, type,
					client_frame, client_frame_len,
					out_buf + len);

	return len;
}

static const struct ap_ops p2p_go_ops = {
	.handle_event = p2p_group_event,
	.get_extra_ies_len = p2p_group_get_ies_len,
	.write_extra_ies = p2p_group_write_ies,
};

static void p2p_dhcp_timeout(struct l_timeout *timeout, void *user_data)
{
	struct p2p_device *dev = user_data;

	l_debug("");

	p2p_connect_failed(dev);
}

static void p2p_dhcp_timeout_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->conn_dhcp_timeout = NULL;
}

static void p2p_group_start(struct p2p_device *dev)
{
	struct l_settings *config = l_settings_new();
	uint8_t psk[32];
	char *macs[2] = {};
	const struct wsc_primary_device_type *pdt =
		&dev->device_info.primary_device_type;
	uint64_t pdt_uint =
		((uint64_t) pdt->category << 48) |
		((uint64_t) pdt->oui[0] << 40) |
		((uint64_t) pdt->oui[1] << 32) |
		((uint64_t) pdt->oui[2] << 24) |
		((uint64_t) pdt->oui_type << 16) |
		pdt->subcategory;

	l_settings_set_string(config, "General", "SSID", dev->go_group_id.ssid);
	l_settings_set_uint(config, "General", "Channel", dev->listen_channel);
	l_settings_set_bool(config, "General", "NoCCKRates", true);
	l_settings_set_string(config, "WSC", "DeviceName",
				dev->device_info.device_name);
	l_settings_set_uint64(config, "WSC", "PrimaryDeviceType", pdt_uint);
	/*
	 * Section 3.1.4.4: "It shall only allow association by the
	 * P2P Device that it is currently in Group Formation with."
	 */
	macs[0] = (char *) util_address_to_string(
						dev->conn_peer_interface_addr);
	l_settings_set_string_list(config, "WSC", "AuthorizedMACs", macs, ',');

	/*
	 * Section 3.2.1: "The Credentials for a P2P Group issued to a
	 * P2P Device shall: [...]
	 *  - Use a Network Key Type of 64 Hex characters."
	 *
	 * This implies we have to send the PSK and not the passphrase to
	 * the WSC clients.  For simplicity we directly generate random
	 * PSKs and don't currently respect the requirement to maintain
	 * a passphrase.  We have no practical use for the passphrase and
	 * it's a little costlier to generate for the same cryptographic
	 * strength as the PSK.
	 */
	if (!l_getrandom(psk, 32)) {
		l_error("l_getrandom() failed");
		l_settings_free(config);
		p2p_connect_failed(dev);
		return;
	}

	l_settings_set_bytes(config, "Security", "PreSharedKey", psk, 32);

	/* Enable netconfig, set maximum usable DHCP lease time */
	l_settings_set_uint(config, "IPv4", "LeaseTime", 0x7fffffff);

	l_settings_set_string(config, "Security", "PairwiseCiphers", "CCMP");
	l_settings_set_string(config, "Security", "GroupCipher", "CCMP");

	dev->capability.group_caps |= P2P_GROUP_CAP_GO;
	dev->capability.group_caps |= P2P_GROUP_CAP_GROUP_FORMATION;
	dev->capability.group_caps |= P2P_GROUP_CAP_IP_ALLOCATION;

	dev->group = ap_start(dev->conn_netdev, config, &p2p_go_ops, NULL, dev);
	l_settings_free(config);

	if (!dev->group) {
		p2p_connect_failed(dev);
		return;
	}

	/* Set timeout on client connecting and getting its IP */
	dev->conn_dhcp_timeout = l_timeout_create(p2p_dhcp_timeout_val,
						p2p_dhcp_timeout, dev,
						p2p_dhcp_timeout_destroy);
}

static void p2p_netconfig_event_handler(enum netconfig_event event,
					void *user_data)
{
	struct p2p_device *dev = user_data;

	switch (event) {
	case NETCONFIG_EVENT_CONNECTED:
		l_timeout_remove(dev->conn_dhcp_timeout);

		if (!dev->conn_peer_ip)
			dev->conn_peer_ip = netconfig_get_dhcp_server_ipv4(
							dev->conn_netconfig);

		p2p_peer_connect_done(dev);
		break;
	default:
		l_error("station: Unsupported netconfig event: %d.", event);
		p2p_connect_failed(dev);
		break;
	}
}

static void p2p_start_client_netconfig(struct p2p_device *dev)
{
	uint32_t ifindex = netdev_get_ifindex(dev->conn_netdev);
	struct l_settings *settings;

	if (!dev->conn_netconfig) {
		dev->conn_netconfig = netconfig_new(ifindex);
		if (!dev->conn_netconfig) {
			p2p_connect_failed(dev);
			return;
		}
	}

	settings = dev->conn_netconfig_settings ?: p2p_dhcp_settings;

	if (!netconfig_load_settings(dev->conn_netconfig, settings) ||
			!netconfig_configure(dev->conn_netconfig,
						p2p_netconfig_event_handler,
						dev)) {
		p2p_connect_failed(dev);
		return;
	}

	dev->conn_dhcp_timeout = l_timeout_create(p2p_dhcp_timeout_val,
						p2p_dhcp_timeout, dev,
						p2p_dhcp_timeout_destroy);
}

static void p2p_netdev_connect_cb(struct netdev *netdev,
					enum netdev_result result,
					void *event_data, void *user_data)
{
	struct p2p_device *dev = user_data;
	struct p2p_peer *peer = dev->conn_peer;

	l_debug("result: %i", result);

	if (!peer->wsc.pending_connect || dev->disconnecting) {
		/* Shouldn't happen except maybe in the ABORTED case */
		return;
	}

	switch (result) {
	case NETDEV_RESULT_OK:
		p2p_start_client_netconfig(dev);
		break;
	case NETDEV_RESULT_AUTHENTICATION_FAILED:
	case NETDEV_RESULT_ASSOCIATION_FAILED:
	case NETDEV_RESULT_HANDSHAKE_FAILED:
	case NETDEV_RESULT_KEY_SETTING_FAILED:
		/*
		 * In the AUTHENTICATION_FAILED and ASSOCIATION_FAILED
		 * cases there's nothing to disconnect.  In the
		 * HANDSHAKE_FAILED and KEY_SETTING failed cases
		 * netdev disconnects from the GO automatically and we are
		 * called already from within the disconnect callback,
		 * so we can directly free the netdev.
		 */
		p2p_connect_failed(dev);
		break;
	case NETDEV_RESULT_ABORTED:
		/*
		 * This case can only be triggered by netdev_disconnect so
		 * we'll wait for its callback before freeing the netdev.
		 * We will also have already replied to
		 * @peer->wsc.pending_connect so we have nothing to do here.
		 */
		break;
	}
}

static void p2p_try_connect_group(struct p2p_device *dev);

static void p2p_netdev_event(struct netdev *netdev, enum netdev_event event,
				void *event_data, void *user_data)
{
	struct p2p_device *dev = user_data;
	const uint16_t *reason_code;

	switch (event) {
	case NETDEV_EVENT_DISCONNECT_BY_AP:
		reason_code = event_data;

		if (*reason_code == MMPDU_REASON_CODE_PREV_AUTH_NOT_VALID &&
				dev->conn_wsc_bss &&
				dev->conn_retry_count < 5) {
			/*
			 * Sometimes a retry helps here, may be that we haven't
			 * waited long enough for the GO setup.
			 */
			l_timeout_remove(dev->conn_dhcp_timeout);

			if (dev->conn_netconfig)
				netconfig_reset(dev->conn_netconfig);

			p2p_try_connect_group(dev);
			break;
		}

		/* Fall through. */
	case NETDEV_EVENT_DISCONNECT_BY_SME:
		/*
		 * We may get a DISCONNECT_BY_SME as a result of a
		 * netdev_disconnect().  In that case let the callback handle
		 * that.
		 */
		if (dev->disconnecting)
			break;

		/* If we're not connected, .Connected is already False */
		if (!p2p_peer_operational(dev->conn_peer)) {
			p2p_connect_failed(dev);
			break;
		}

		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(dev->conn_peer),
					IWD_P2P_PEER_INTERFACE, "Connected");
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(dev->conn_peer),
					IWD_P2P_PEER_INTERFACE,
					"ConnectedInterface");
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(dev->conn_peer),
					IWD_P2P_PEER_INTERFACE,
					"ConnectedIP");
		p2p_connection_reset(dev);
		break;
	default:
		break;
	};
}

static const char *p2p_ip_to_string(uint32_t addr)
{
	struct in_addr ia = { .s_addr = addr };

	return inet_ntoa(ia);
}

static void p2p_handshake_event(struct handshake_state *hs,
				enum handshake_event event, void *user_data,
				...)
{
	va_list args;

	va_start(args, user_data);

	switch (event) {
	case HANDSHAKE_EVENT_COMPLETE:
	{
		struct p2p_device *dev = user_data;
		struct l_settings *ip_config;

		if (!hs->support_ip_allocation)
			break;

		ip_config = l_settings_new();
		l_settings_set_string(ip_config, "IPv4", "Address",
					p2p_ip_to_string(hs->client_ip_addr));
		l_settings_set_string(ip_config, "IPv4", "Netmask",
					p2p_ip_to_string(hs->subnet_mask));
		dev->conn_netconfig_settings = ip_config;
		dev->conn_peer_ip = l_strdup(p2p_ip_to_string(hs->go_ip_addr));

		break;
	}
	case HANDSHAKE_EVENT_FAILED:
		netdev_handshake_failed(hs, va_arg(args, int));
		break;
	default:
		break;
	}

	va_end(args);
}

static void p2p_try_connect_group(struct p2p_device *dev)
{
	struct scan_bss *bss = dev->conn_wsc_bss;
	struct handshake_state *hs = NULL;
	struct iovec ie_iov[16];
	int ie_num = 0;
	int r;
	struct p2p_association_req info = {};
	struct ie_rsn_info bss_info = {};
	struct ie_rsn_info rsn_info = {};
	uint8_t rsne_buf[256];
	uint8_t wfd_ie[32];

	info.capability = dev->capability;
	info.device_info = dev->device_info;

	ie_iov[0].iov_base = p2p_build_association_req(&info,
							&ie_iov[0].iov_len);
	L_WARN_ON(!ie_iov[0].iov_base);
	ie_num = 1;

	if (dev->conn_own_wfd) {
		ie_iov[ie_num].iov_base = wfd_ie;
		ie_iov[ie_num].iov_len = p2p_build_wfd_ie(dev->conn_own_wfd,
								NULL, wfd_ie);
		ie_num++;
	}

	scan_bss_get_rsn_info(bss, &bss_info);

	rsn_info.akm_suites = wiphy_select_akm(dev->wiphy, bss, SECURITY_PSK,
						&bss_info, false);
	if (!rsn_info.akm_suites)
		goto not_supported;

	rsn_info.pairwise_ciphers = wiphy_select_cipher(dev->wiphy,
						bss_info.pairwise_ciphers);
	rsn_info.group_cipher = wiphy_select_cipher(dev->wiphy,
						bss_info.group_cipher);
	if (!rsn_info.pairwise_ciphers || !rsn_info.group_cipher)
		goto not_supported;

	rsn_info.group_management_cipher = wiphy_select_cipher(dev->wiphy,
					bss_info.group_management_cipher);
	rsn_info.mfpc = rsn_info.group_management_cipher != 0;
	ie_build_rsne(&rsn_info, rsne_buf);

	hs = netdev_handshake_state_new(dev->conn_netdev);

	if (!handshake_state_set_authenticator_ie(hs, bss->rsne))
		goto not_supported;

	if (!handshake_state_set_supplicant_ie(hs, rsne_buf))
		goto not_supported;

	handshake_state_set_event_func(hs, p2p_handshake_event, dev);
	handshake_state_set_ssid(hs, bss->ssid, bss->ssid_len);
	handshake_state_set_pmk(hs, dev->conn_psk, 32);

	if (dev->conn_peer_capability.group_caps & P2P_GROUP_CAP_IP_ALLOCATION)
		hs->support_ip_allocation = true;

	r = netdev_connect(dev->conn_netdev, bss, hs, ie_iov, ie_num,
				p2p_netdev_event, p2p_netdev_connect_cb, dev);
	if (r < 0) {
		l_error("netdev_connect error: %s (%i)", strerror(-r), -r);
		goto error;
	}

	dev->conn_retry_count++;

done:
	l_free(ie_iov[0].iov_base);
	return;

error:
not_supported:
	if (hs)
		handshake_state_free(hs);

	p2p_connect_failed(dev);
	goto done;
}

static void p2p_peer_provision_done(int err, struct wsc_credentials_info *creds,
					unsigned int n_creds, void *user_data)
{
	struct p2p_peer *peer = user_data;
	struct p2p_device *dev = peer->dev;
	struct scan_bss *bss = dev->conn_wsc_bss;

	l_debug("err=%i n_creds=%u", err, n_creds);

	dev->conn_enrollee = NULL;

	l_timeout_remove(dev->conn_peer_config_timeout);
	l_timeout_remove(dev->conn_go_neg_req_timeout);

	if (err < 0) {
		if (err == -ECANCELED && peer->wsc.pending_cancel) {
			dbus_pending_reply(&peer->wsc.pending_cancel,
				l_dbus_message_new_method_return(
						peer->wsc.pending_cancel));

			p2p_connection_reset(dev);
			return;
		}

		goto error;
	}

	if (strlen(creds[0].ssid) != bss->ssid_len ||
			memcmp(creds[0].ssid, bss->ssid, bss->ssid_len)) {
		l_error("Unsupported: the SSID from the P2P peer's WSC "
			"credentials doesn't match the SSID from the "
			"Probe Response IEs");
		goto not_supported;
	}

	/*
	 * Apparently some implementations send the intended client's address
	 * here (i.e. our), and some send the target BSS's (their own).
	 */
	if (memcmp(creds[0].addr, netdev_get_address(dev->conn_netdev), 6) &&
			memcmp(creds[0].addr, bss->addr, 6)) {
		char addr1[32], addr2[32];

		l_strlcpy(addr1, util_address_to_string(creds[0].addr),
				sizeof(addr1));
		l_strlcpy(addr2, util_address_to_string(
					netdev_get_address(dev->conn_netdev)),
				sizeof(addr2));
		l_error("Error: WSC credentials are not for our client "
			"interface (%s vs. %s)", addr1, addr2);
		goto error;
	}

	if (!bss->rsne || creds[0].security != SECURITY_PSK)
		goto not_supported;

	if (creds[0].has_passphrase) {
		if (crypto_psk_from_passphrase(creds[0].passphrase, bss->ssid,
						bss->ssid_len,
						dev->conn_psk) < 0)
			goto error;
	} else
		memcpy(dev->conn_psk, creds[0].psk, 32);

	dev->conn_retry_count = 0;
	p2p_try_connect_group(dev);
	return;

error:
not_supported:
	p2p_connect_failed(dev);
}

static void p2p_provision_connect(struct p2p_device *dev)
{
	struct iovec iov[16];
	int iov_num;
	uint8_t wfd_ie[32];
	struct p2p_association_req info = {};

	/* Ready to start the provisioning */
	info.capability = dev->capability;
	info.device_info = dev->device_info;

	iov[0].iov_base = p2p_build_association_req(&info, &iov[0].iov_len);
	L_WARN_ON(!iov[0].iov_base);
	iov_num = 1;

	if (dev->conn_own_wfd) {
		iov[iov_num].iov_base = wfd_ie;
		iov[iov_num].iov_len = p2p_build_wfd_ie(dev->conn_own_wfd,
							NULL, wfd_ie);
		iov_num++;
	}

	dev->conn_enrollee = wsc_enrollee_new(dev->conn_netdev,
						dev->conn_wsc_bss,
						dev->conn_pin, iov, iov_num,
						p2p_peer_provision_done,
						dev->conn_peer);
	l_free(iov[0].iov_base);
}

static void p2p_device_netdev_watch_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->conn_netdev_watch_id = 0;
}

static void p2p_device_netdev_notify(struct netdev *netdev,
					enum netdev_watch_event event,
					void *user_data)
{
	struct p2p_device *dev = user_data;

	if (dev->conn_netdev != netdev)
		return;

	switch (event) {
	case NETDEV_WATCH_EVENT_UP:
	case NETDEV_WATCH_EVENT_NEW:
		/* Ignore the event if we're already connecting/connected */
		if (dev->conn_enrollee || dev->conn_retry_count ||
				dev->group || !netdev_get_is_up(netdev))
			break;

		if (dev->is_go)
			p2p_group_start(dev);
		else
			p2p_provision_connect(dev);

		break;
	case NETDEV_WATCH_EVENT_DEL:
		dev->conn_netdev = NULL;
		/* Fall through */
	case NETDEV_WATCH_EVENT_DOWN:
	case NETDEV_WATCH_EVENT_ADDRESS_CHANGE:
		p2p_connect_failed(dev);
		break;
	default:
		break;
	}
}

static void p2p_device_new_interface_cb(struct l_genl_msg *msg,
					void *user_data)
{
	struct p2p_device *dev = user_data;

	l_debug("");

	if (l_genl_msg_get_error(msg) < 0) {
		l_error("NEW_INTERFACE failed: %s",
			strerror(-l_genl_msg_get_error(msg)));
		p2p_connect_failed(dev);
		return;
	}

	/* Create the netdev so we don't have to parse the message ourselves */
	dev->conn_netdev = netdev_create_from_genl(msg, dev->conn_addr);
	if (!dev->conn_netdev) {
		p2p_connect_failed(dev);
		return;
	}

	/*
	 * Register a watch for each connection rather than having one
	 * global watch.  Each connection's watch will receive events
	 * related to all other connections too, and will check that its
	 * conn_netdev != netdev and exit immediately.  This is not ideal
	 * but it's the same complexity (n^2) as that of one global watch
	 * that receives all events and iterates over p2p_device_list to
	 * find the connection.
	 */
	dev->conn_netdev_watch_id = netdev_watch_add(p2p_device_netdev_notify,
					dev, p2p_device_netdev_watch_destroy);
}

static void p2p_device_new_interface_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->conn_new_intf_cmd_id = 0;
}

static void p2p_device_interface_create(struct p2p_device *dev)
{
	uint32_t iftype = dev->is_go ? NL80211_IFTYPE_P2P_GO :
		NL80211_IFTYPE_P2P_CLIENT;
	char ifname[32];
	uint32_t wiphy_id = dev->wdev_id >> 32;
	struct l_genl_msg *msg;

	snprintf(ifname, sizeof(ifname), "wlan%i-p2p-%s%i",
			wiphy_id, dev->is_go ? "go" : "cl", dev->conn_num++);
	l_debug("creating %s", ifname);

	msg = l_genl_msg_new(NL80211_CMD_NEW_INTERFACE);
	l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY, 4, &wiphy_id);
	l_genl_msg_append_attr(msg, NL80211_ATTR_IFTYPE, 4, &iftype);
	l_genl_msg_append_attr(msg, NL80211_ATTR_IFNAME,
				strlen(ifname) + 1, ifname);
	l_genl_msg_append_attr(msg, NL80211_ATTR_4ADDR, 1, "\0");
	l_genl_msg_append_attr(msg, NL80211_ATTR_SOCKET_OWNER, 0, "");

	dev->conn_new_intf_cmd_id = l_genl_family_send(dev->nl80211, msg,
					p2p_device_new_interface_cb, dev,
					p2p_device_new_interface_destroy);
	if (!dev->conn_new_intf_cmd_id) {
		l_genl_msg_unref(msg);
		l_error("Error sending NEW_INTERFACE for %s", ifname);
		p2p_connect_failed(dev);
	}
}

static void p2p_scan_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->scan_id = 0;
}

static void p2p_provision_scan_start(struct p2p_device *dev);

static bool p2p_provision_scan_notify(int err, struct l_queue *bss_list,
					const struct scan_freq_set *freqs,
					void *user_data)
{
	struct p2p_device *dev = user_data;
	const struct l_queue_entry *entry;
	static const uint8_t wildcard_addr[6] =
		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

	l_debug("err=%i, len(bss_list)=%i", err, l_queue_length(bss_list));

	if (err) {
		l_error("P2P provision scan failed: %s (%i)", strerror(-err),
			-err);
		p2p_connect_failed(dev);
		return false;
	}

	for (entry = l_queue_get_entries(bss_list); entry;
			entry = entry->next) {
		struct scan_bss *bss = entry->data;
		const uint8_t *group_id;
		bool selected_reg;
		struct p2p_capability_attr *capability;
		enum wsc_device_password_id device_password_id;
		const uint8_t *amacs;
		struct wsc_probe_response wsc_probe_info;
		struct wsc_beacon wsc_beacon_info;

		/*
		 * Check if we found our target GO, some of these checks may
		 * need to be gradually relaxed as we discover non-compliant
		 * implementations but at least print a debug statement when
		 * something doesn't match.
		 */

		if (strncmp((const char *) bss->ssid, dev->go_group_id.ssid,
				bss->ssid_len))
			continue;

		if (dev->go_group_id.ssid[bss->ssid_len] != '\0')
			continue;

		if (!l_memeqzero(dev->conn_peer_interface_addr, 6) &&
				memcmp(bss->addr, dev->conn_peer_interface_addr,
					6))
			l_debug("SSID matched but BSSID didn't match the GO's "
				"intended interface addr, proceeding anyway");

		if (!bss->wsc) {
			l_error("SSID matched but no valid WSC IE");
			continue;
		}

		if (bss->source_frame == SCAN_BSS_PROBE_RESP) {
			if (!bss->p2p_probe_resp_info) {
				l_error("SSID matched but no valid P2P IE");
				continue;
			}

			if (wsc_parse_probe_response(bss->wsc, bss->wsc_size,
							&wsc_probe_info) < 0) {
				l_error("SSID matched but can't parse WSC "
					"Probe Response info");
				continue;
			}

			group_id = bss->p2p_probe_resp_info->
				device_info.device_addr;
			selected_reg = wsc_probe_info.selected_registrar;
			capability = &bss->p2p_probe_resp_info->capability;
			device_password_id = wsc_probe_info.device_password_id;
			amacs = wsc_probe_info.authorized_macs;
		} else if (bss->source_frame == SCAN_BSS_BEACON) {
			if (!bss->p2p_beacon_info) {
				l_error("SSID matched but no valid P2P IE");
				continue;
			}

			if (wsc_parse_beacon(bss->wsc, bss->wsc_size,
						&wsc_beacon_info) < 0) {
				l_error("SSID matched but can't parse WSC "
					"Beacon info");
				continue;
			}

			group_id = bss->p2p_beacon_info->device_addr;
			selected_reg = wsc_beacon_info.selected_registrar;
			capability = &bss->p2p_beacon_info->capability;
			device_password_id = wsc_beacon_info.device_password_id;
			amacs = wsc_beacon_info.authorized_macs;
		} else
			continue;

		if (memcmp(group_id, dev->go_group_id.device_addr, 6)) {
			l_error("SSID matched but Group ID address didn't");
			continue;
		}

		if (!selected_reg) {
			/*
			 * Debug level because this will sometimes happen
			 * while the target is setting up the GO mode in the
			 * course of normal operation, and gets set to true
			 * in a few seconds, we just need to keep scanning.
			 */
			l_debug("SSID matched but not a Selected Reg");
			continue;
		}

		if (dev->conn_peer->group && (capability->group_caps &
					P2P_GROUP_CAP_GROUP_FORMATION)) {
			l_error("SSID matched but not in Group Formation");
			continue;
		}

		if (!dev->conn_peer->group && !(capability->group_caps &
					P2P_GROUP_CAP_GROUP_FORMATION))
			/*
			 * We have to ignore this one for interoperability
			 * with some devices.
			 */
			l_debug("SSID matched but GO not in Group Formation, "
				"proceeding anyway");

		if (capability->group_caps & P2P_GROUP_CAP_GROUP_LIMIT) {
			l_error("SSID matched but group already full");
			continue;
		}

		if (device_password_id != dev->conn_password_id) {
			l_error("SSID matched wrong Password ID");
			continue;
		}

		if (!l_memeqzero(amacs, 30)) {
			bool amacs_match = false;
			int i;

			for (i = 0; i < 5; i++, amacs += 6)
				if (!memcmp(amacs, dev->addr, 6) ||
						!memcmp(amacs, wildcard_addr, 6))
					amacs_match = true;

			if (!amacs_match) {
				l_error("SSID matched we're not in AMacs");
				continue;
			}
		}

		l_debug("GO found in the scan results");

		dev->conn_wsc_bss = bss;
		dev->conn_peer_capability = *capability;
		p2p_device_interface_create(dev);
		l_queue_remove(bss_list, bss);
		l_queue_destroy(bss_list,
				(l_queue_destroy_func_t) scan_bss_free);
		return true;
	}

	/* Retry a few times if the WSC AP not found or not ready */
	dev->conn_go_scan_retry++;

	if (dev->conn_go_scan_retry > 15) {
		p2p_connect_failed(dev);
		return false;
	}

	p2p_provision_scan_start(dev);
	return false;
}

static void p2p_provision_scan_start(struct p2p_device *dev)
{
	struct scan_parameters params = {};
	struct scan_freq_set *freqs = NULL;
	uint8_t buf[256];

	params.flush = true;
	params.no_cck_rates = true;
	params.ssid = (const uint8_t *)dev->go_group_id.ssid;
	params.ssid_len = strlen(dev->go_group_id.ssid);
	params.extra_ie = p2p_build_scan_ies(dev, buf, sizeof(buf),
						&params.extra_ie_size);
	L_WARN_ON(!params.extra_ie);

	/*
	 * Rather than create the new interface and create a new
	 * scan_context on it, use the P2P-Device interface and set
	 * params.source_mac to our future P2P-Client address.
	 */
	params.source_mac = dev->conn_addr;

	/*
	 * Initially scan just the Operating Channel the GO reported
	 * during the negotiation.  In theory there's no guarantee that
	 * it is going to be on that channel so we should fall back
	 * to scanning all the channels listed in the Channel List
	 * attribute.  For simplicity we just do a full scan in that
	 * scenario -- for most target P2P devices we wouldn't be saving
	 * ourselves any work anyway as the Channel List is going to
	 * contain all of the 2.4 and 5G channels.
	 */
	if (dev->conn_go_scan_retry < 12) {
		freqs = scan_freq_set_new();
		scan_freq_set_add(freqs, dev->conn_go_oper_freq);
		params.freqs = freqs;
	}

	dev->scan_id = scan_active_full(dev->wdev_id, &params, NULL,
					p2p_provision_scan_notify, dev,
					p2p_scan_destroy);

	if (freqs)
		scan_freq_set_free(freqs);
}

static void p2p_start_client_provision(struct p2p_device *dev)
{
	char bssid_str[18];

	memcpy(bssid_str, util_address_to_string(dev->conn_peer_interface_addr),
		18);
	l_debug("freq=%u ssid=%s group_addr=%s bssid=%s",
		dev->conn_go_oper_freq, dev->go_group_id.ssid,
		util_address_to_string(dev->go_group_id.device_addr),
		bssid_str);

	dev->conn_go_scan_retry = 0;
	p2p_provision_scan_start(dev);
}

static void p2p_config_timeout_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->conn_peer_config_timeout = NULL;
}

static void p2p_config_timeout(struct l_timeout *timeout, void *user_data)
{
	struct p2p_device *dev = user_data;

	l_timeout_remove(dev->conn_peer_config_timeout);

	/* Ready to start WSC */
	p2p_start_client_provision(dev);
}

static void p2p_go_negotiation_resp_done(int error, void *user_data)
{
	struct p2p_device *dev = user_data;

	if (error)
		l_error("Sending the GO Negotiation Response failed: %s (%i)",
			strerror(-error), -error);
	else
		l_error("No GO Negotiation Confirmation frame received");

	p2p_connect_failed(dev);
}

static void p2p_go_negotiation_resp_err_done(int error, void *user_data)
{
	if (error)
		l_error("Sending the GO Negotiation Response failed: %s (%i)",
			strerror(-error), -error);
}

/*
 * Called by GO Negotiation Response and Confirmation receive handlers,
 * in both cases the channel lists are required to be subsets of our
 * own supported channels and the Operating Channel must appear in the
 * channel list.
 */
static bool p2p_device_validate_channel_list(struct p2p_device *dev,
				const struct p2p_channel_list_attr *attr,
				const struct p2p_channel_attr *oper_channel)
{
	if (l_queue_isempty(attr->channel_entries))
		return false;

	/* TODO */
	return true;
}

/*
 * It seems that sending more than about 42 channels in a frame's Channel
 * List attribute will baffle some devices enough that they will ignore
 * the frame.
 */
#define MAX_CHANNELS 40

static void p2p_add_freq_func(uint32_t freq, void *user_data)
{
	struct p2p_channel_entries *channel_entry = user_data;
	uint8_t channel;
	enum band_freq band;

	if (channel_entry->n_channels >= MAX_CHANNELS)
		return;

	channel = band_freq_to_channel(freq, &band);

	if (band != band_oper_class_to_band((const uint8_t *) "XX\x4",
						channel_entry->oper_class))
		return;

	channel_entry->channels[channel_entry->n_channels++] = channel;
}

static void p2p_device_fill_channel_list(struct p2p_device *dev,
					struct p2p_channel_list_attr *attr)
{
	struct p2p_channel_entries *channel_entry;
	unsigned int total_channels;

	memcpy(attr->country, dev->listen_country, 3);
	attr->channel_entries = l_queue_new();

	channel_entry = l_malloc(sizeof(struct p2p_channel_entries) +
					MAX_CHANNELS);
	channel_entry->oper_class = 81;
	channel_entry->n_channels = 0;
	scan_freq_set_foreach(wiphy_get_supported_freqs(dev->wiphy),
				p2p_add_freq_func, channel_entry);
	l_queue_push_tail(attr->channel_entries, channel_entry);
	total_channels = channel_entry->n_channels;

	if (total_channels >= MAX_CHANNELS)
		return;

	channel_entry = l_malloc(sizeof(struct p2p_channel_entries) +
					MAX_CHANNELS);
	channel_entry->oper_class = 115;
	channel_entry->n_channels = 0;
	scan_freq_set_foreach(wiphy_get_supported_freqs(dev->wiphy),
				p2p_add_freq_func, channel_entry);

	if (total_channels + channel_entry->n_channels > MAX_CHANNELS)
		channel_entry->n_channels = MAX_CHANNELS - total_channels;

	l_queue_push_tail(attr->channel_entries, channel_entry);
}

static bool p2p_go_negotiation_confirm_cb(const struct mmpdu_header *mpdu,
					const void *body, size_t body_len,
					int rssi, struct p2p_device *dev)
{
	struct p2p_go_negotiation_confirmation info;
	int r;

	l_debug("");

	if (body_len < 8) {
		l_error("GO Negotiation Confirmation frame too short");
		p2p_connect_failed(dev);
		return true;
	}

	r = p2p_parse_go_negotiation_confirmation(body + 7, body_len - 7,
							&info);
	if (r < 0) {
		l_error("GO Negotiation Confirmation parse error %s (%i)",
			strerror(-r), -r);
		p2p_connect_failed(dev);
		return true;
	}

	if (info.dialog_token != dev->conn_go_dialog_token) {
		l_error("GO Negotiation Response dialog token doesn't match");
		p2p_connect_failed(dev);
		goto cleanup;
	}

	if (info.status != P2P_STATUS_SUCCESS) {
		l_error("GO Negotiation Confirmation status %i", info.status);
		p2p_connect_failed(dev);
		goto cleanup;
	}

	/* Check whether WFD IE is required, validate it if present */
	if (!p2p_device_validate_conn_wfd(dev, info.wfd, info.wfd_size)) {
		p2p_connect_failed(dev);
		goto cleanup;
	}

	/*
	 * In both scenarios the Channel List is a subset of what we previously
	 * sent in the GO Negotiation Response and must contain the Operating
	 * Channel.
	 */
	if (!p2p_device_validate_channel_list(dev, &info.channel_list,
						&info.operating_channel)) {
		p2p_connect_failed(dev);
		goto cleanup;
	}

	/*
	 * Not validating .capability.group_caps, it's either reserved
	 * (dev->is_go) or has to be identical to that in the GO Negotiation
	 * Request (!dev->is_go).
	 */

	if (dev->is_go) {
		if (memcmp(info.operating_channel.country,
				dev->listen_country, 3) ||
				info.operating_channel.oper_class !=
				dev->listen_oper_class ||
				info.operating_channel.channel_num !=
				dev->listen_channel) {
			l_error("Bad operating channel in GO Negotiation "
				"Confirmation");
			p2p_connect_failed(dev);
			goto cleanup;
		}

		/*
		 * Start setting the group up right away and we'll add the
		 * client's Configuation Timeout to the WSC start timeout's
		 * value.
		 */
		p2p_device_interface_create(dev);
	} else {
		enum band_freq band = band_oper_class_to_band(
			(const uint8_t *) info.operating_channel.country,
			info.operating_channel.oper_class);
		uint32_t frequency = band_channel_to_freq(
					info.operating_channel.channel_num,
					band);

		if (!frequency) {
			l_error("Bad operating channel in GO Negotiation "
				"Confirmation");
			p2p_connect_failed(dev);
			goto cleanup;
		}

		dev->conn_go_oper_freq = frequency;
		memcpy(&dev->go_group_id, &info.group_id,
			sizeof(struct p2p_group_id_attr));

		/*
		 * Confirmation received.  For simplicity wait idly the maximum
		 * amount of time indicated by the peer in the GO Negotiation
		 * Request's Configuration Timeout attribute and start the
		 * provisioning phase.
		 */
		dev->conn_peer_config_timeout = l_timeout_create_ms(
						dev->conn_config_delay,
						p2p_config_timeout, dev,
						p2p_config_timeout_destroy);
	}

cleanup:
	p2p_clear_go_negotiation_confirmation(&info);
	return true;
}

static void p2p_set_group_id(struct p2p_device *dev)
{
	const char *name = dev->device_info.device_name;
	char buf[2];

	/* SSID format following section 3.2.1 */
	p2p_get_random_string(buf, 2);
	snprintf(dev->go_group_id.ssid, sizeof(dev->go_group_id.ssid),
			"DIRECT-%c%c-%.22s", buf[0], buf[1], name);
	memcpy(dev->go_group_id.device_addr, dev->addr, 6);
}

static void p2p_device_go_negotiation_req_cb(const struct mmpdu_header *mpdu,
						const void *body,
						size_t body_len, int rssi,
						void *user_data)
{
	struct p2p_device *dev = user_data;
	struct p2p_go_negotiation_req req_info;
	struct p2p_go_negotiation_resp resp_info = {};
	int r;
	uint8_t *resp_body;
	size_t resp_len;
	uint8_t wfd_ie[32];
	struct iovec iov[16];
	int iov_len = 0;
	struct p2p_peer *peer;
	enum p2p_attr_status_code status = P2P_STATUS_SUCCESS;

	l_debug("");

	/*
	 * Check the Destination Address and the BSSID. Section 2.4.3:
	 * "When communication is not within a P2P Group, e.g. during
	 * [...] GO Negotiation [...], a P2P Device shall use the
	 * P2P Device Address of the intended destination as the BSSID in
	 * Request, or Confirmation frames and its own P2P Device Address
	 * as the BSSID in Response frames."
	 *
	 * Some drivers (brcmfmac) will report the BSSID as all zeros and
	 * some Wi-Fi Display dongles will pass their own address as the
	 * BSSID in the GO Negotiation Request so allow all three possible
	 * values.
	 */
	if (memcmp(mpdu->address_1, dev->addr, 6) ||
			(memcmp(mpdu->address_3, dev->addr, 6) &&
			 memcmp(mpdu->address_3, mpdu->address_2, 6) &&
			 !l_memeqzero(mpdu->address_3, 6)))
		return;

	peer = l_queue_find(dev->peer_list, p2p_peer_match, mpdu->address_2);
	if (!peer)
		return;

	if (body_len < 8)
		return;

	if (!dev->conn_go_neg_req_timeout || peer != dev->conn_peer) {
		status = P2P_STATUS_FAIL_INFO_NOT_AVAIL;
		goto respond;
	}

	if (memcmp(mpdu->address_2, dev->conn_peer->bss->addr, 6)) {
		status = P2P_STATUS_FAIL_UNABLE_TO_ACCOMMODATE_REQUEST;
		goto respond;
	}

	r = p2p_parse_go_negotiation_req(body + 7, body_len - 7, &req_info);
	if (r < 0) {
		l_error("GO Negotiation Request parse error %s (%i)",
			strerror(-r), -r);
		p2p_connect_failed(dev);
		status = P2P_STATUS_FAIL_INVALID_PARAMS;
		goto respond;
	}

	dev->conn_go_tie_breaker = !req_info.go_tie_breaker;
	dev->is_go = P2P_GO_INTENT * 2 + dev->conn_go_tie_breaker >
		req_info.go_intent * 2;

	if ((req_info.capability.group_caps & P2P_GROUP_CAP_PERSISTENT_GROUP) &&
			!dev->is_go) {
		if (peer->wsc.pending_connect) {
			struct l_dbus_message *reply =
				dbus_error_not_supported(
						peer->wsc.pending_connect);

			dbus_pending_reply(&peer->wsc.pending_connect, reply);
		}

		p2p_connect_failed(dev);
		l_error("Persistent groups not supported");
		status = P2P_STATUS_FAIL_INCOMPATIBLE_PARAMS;
		goto p2p_free;
	}

	if (req_info.device_password_id != dev->conn_password_id) {
		p2p_connect_failed(dev);
		l_error("Incompatible Password ID in the GO Negotiation Req");
		status = P2P_STATUS_FAIL_INCOMPATIBLE_PROVISIONING;
		goto p2p_free;
	}

	if (!p2p_device_validate_channel_list(dev, &req_info.channel_list,
						&req_info.operating_channel)) {
		p2p_connect_failed(dev);
		status = P2P_STATUS_FAIL_INCOMPATIBLE_PARAMS;
		goto p2p_free;
	}

	if (dev->is_go) {
		const struct l_queue_entry *entry;
		const struct p2p_channel_entries *entries;
		int i;

		/*
		 * Section 3.1.4.2.1: "The Channel List attribute shall
		 * indicate the channels that the P2P Device can support as
		 * Operating Channel of the P2P Group if it becomes P2P Group
		 * Owner."
		 * Section 3.1.4.2.2: "The channels indicated in the Channel
		 * List shall only include channels from the Channel List
		 * attribute in the GO Negotiation Request frame. [...]
		 * The channel indicated in the Operating Channel attribute
		 * shall be one of the channels in the Channel List attribute
		 * in the GO Negotiation Response frame."
		 *
		 * Since the sender is not becoming the GO this shouldn't
		 * affect us but following 3.1.4.2.2 our operating channel
		 * should be one of those listed in the GO Negotiation
		 * Response which in turn are the subset of those in the
		 * Request.  So effectively the list in the Request limits
		 * the peer's set of supported operating channels both as the
		 * GO and the Client.  Check that our listen channel is in
		 * that set.
		 * TODO: if it's not, look for a different channel.
		 */
		for (entry = l_queue_get_entries(
					req_info.channel_list.channel_entries);
				entry; entry = entry->next) {
			entries = entry->data;

			if (entries->oper_class == dev->listen_oper_class)
				break;
		}

		if (!entry) {
			l_error("Our Operating Class not listed in "
				"the GO Negotiation Request");
			p2p_connect_failed(dev);
			status = P2P_STATUS_FAIL_NO_COMMON_CHANNELS;
			goto p2p_free;
		}

		for (i = 0; i < entries->n_channels; i++)
			if (entries->channels[i] == dev->listen_channel)
				break;

		if (i == entries->n_channels) {
			l_error("Our listen channel not listed in "
				"the GO Negotiation Request");
			p2p_connect_failed(dev);
			status = P2P_STATUS_FAIL_NO_COMMON_CHANNELS;
			goto p2p_free;
		}
	}

	/* Check whether WFD IE is required, validate it if present */
	if (!p2p_device_validate_conn_wfd(dev, req_info.wfd,
						req_info.wfd_size)) {
		p2p_connect_failed(dev);
		status = P2P_STATUS_FAIL_INCOMPATIBLE_PARAMS;
		goto p2p_free;
	}

	l_timeout_remove(dev->conn_go_neg_req_timeout);
	p2p_device_discovery_stop(dev);

	dev->conn_go_dialog_token = req_info.dialog_token;
	memcpy(dev->conn_peer_interface_addr, req_info.intended_interface_addr,
		6);

	if (dev->is_go && dev->conn_peer) {
		p2p_set_group_id(dev);

		dev->conn_config_delay =
			req_info.config_timeout.client_config_timeout * 10;
	} else {
		dev->conn_config_delay =
			req_info.config_timeout.go_config_timeout * 10;
	}

p2p_free:
	dev->conn_go_tie_breaker = !req_info.go_tie_breaker;
	p2p_clear_go_negotiation_req(&req_info);

respond:
	/* Build and send the GO Negotiation Response */
	resp_info.dialog_token = dev->conn_go_dialog_token;
	resp_info.status = status;

	if (dev->is_go && dev->conn_peer) {
		struct l_queue *channel_list = l_queue_new();
		struct p2p_channel_entries *channel_entries =
			l_malloc(sizeof(struct p2p_channel_entries) + 1);

		resp_info.capability = dev->capability;
		memcpy(resp_info.operating_channel.country,
			dev->listen_country, 3);
		resp_info.operating_channel.oper_class = dev->listen_oper_class;
		resp_info.operating_channel.channel_num = dev->listen_channel;
		memcpy(&resp_info.group_id, &dev->go_group_id,
			sizeof(struct p2p_group_id_attr));

		channel_entries->oper_class = dev->listen_oper_class;
		channel_entries->n_channels = 1;
		channel_entries->channels[0] = dev->listen_channel;
		l_queue_push_tail(channel_list, channel_entries);

		memcpy(resp_info.channel_list.country, dev->listen_country, 3);
		resp_info.channel_list.channel_entries = channel_list;
	} else {
		resp_info.capability.device_caps = dev->capability.device_caps;
		resp_info.capability.group_caps = 0;	/* Reserved */
		p2p_device_fill_channel_list(dev, &resp_info.channel_list);
	}

	resp_info.go_intent = P2P_GO_INTENT;
	resp_info.go_tie_breaker = dev->conn_go_tie_breaker;
	resp_info.config_timeout.go_config_timeout = 50;	/* 500ms */
	resp_info.config_timeout.client_config_timeout = 50;	/* 500ms */

	if (dev->conn_peer)
		memcpy(resp_info.intended_interface_addr, dev->conn_addr, 6);

	resp_info.device_info = dev->device_info;
	resp_info.device_info.wsc_config_methods = dev->conn_config_method;
	resp_info.device_password_id = dev->conn_password_id;

	if (dev->conn_own_wfd) {
		resp_info.wfd = wfd_ie;
		resp_info.wfd_size = p2p_build_wfd_ie(dev->conn_own_wfd,
							NULL, wfd_ie);
	}

	resp_body = p2p_build_go_negotiation_resp(&resp_info, &resp_len);
	resp_info.wfd = NULL;
	p2p_clear_go_negotiation_resp(&resp_info);

	if (!resp_body) {
		p2p_connect_failed(dev);
		return;
	}

	iov[iov_len].iov_base = resp_body;
	iov[iov_len].iov_len = resp_len;
	iov_len++;

	iov[iov_len].iov_base = NULL;

	if (status == P2P_STATUS_SUCCESS)
		p2p_peer_frame_xchg(peer, iov, dev->addr, 0, 600, 0, true,
					FRAME_GROUP_P2P_CONNECT,
					p2p_go_negotiation_resp_done,
					&p2p_frame_go_neg_confirm,
					p2p_go_negotiation_confirm_cb, NULL);
	else
		p2p_peer_frame_xchg(peer, iov, dev->addr, 0, 0, 0, true,
					FRAME_GROUP_P2P_CONNECT,
					p2p_go_negotiation_resp_err_done, NULL);

	l_debug("GO Negotiation Response sent with status %i", status);
	l_free(resp_body);
}

static void p2p_go_negotiation_confirm_done(int error, void *user_data)
{
	struct p2p_device *dev = user_data;

	if (error) {
		/* TODO: we should probably ignore the missing ACK error */
		l_error("Sending the GO Negotiation Confirm failed: %s (%i)",
			strerror(-error), -error);
		p2p_connect_failed(dev);
		return;
	}

	/*
	 * Frame was ACKed.  On the GO start setting the group up right
	 * away and we'll add the client's Configuation Timeout to the
	 * WSC start timeout's value.  On the client wait idly the
	 * maximum amount of time indicated by the peer in the GO
	 * Negotiation Response's Configuration Timeout attribute and
	 * start the provisioning phase.
	 */
	if (dev->is_go) {
		p2p_device_interface_create(dev);
		return;
	}

	dev->conn_peer_config_timeout = l_timeout_create_ms(
						dev->conn_config_delay,
						p2p_config_timeout, dev,
						p2p_config_timeout_destroy);
}

static void p2p_go_neg_req_timeout_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->conn_go_neg_req_timeout = NULL;
}

static void p2p_go_neg_req_timeout(struct l_timeout *timeout, void *user_data)
{
	struct p2p_device *dev = user_data;

	l_debug("");

	p2p_connect_failed(dev);
}

static bool p2p_go_negotiation_resp_cb(const struct mmpdu_header *mpdu,
					const void *body, size_t body_len,
					int rssi, struct p2p_device *dev)
{
	struct p2p_go_negotiation_resp resp_info;
	struct p2p_go_negotiation_confirmation confirm_info = {};
	uint8_t *confirm_body;
	size_t confirm_len;
	uint8_t wfd_ie[32];
	int r;
	struct iovec iov[16];
	int iov_len = 0;
	enum band_freq band;
	uint32_t frequency;

	l_debug("");

	if (!dev->conn_peer)
		return true;

	if (body_len < 8) {
		l_error("GO Negotiation Response frame too short");
		p2p_connect_failed(dev);
		return true;
	}

	r = p2p_parse_go_negotiation_resp(body + 7, body_len - 7, &resp_info);
	if (r < 0) {
		l_error("GO Negotiation Response parse error %s (%i)",
			strerror(-r), -r);
		p2p_connect_failed(dev);
		return true;
	}

	if (resp_info.dialog_token != 1) {
		l_error("GO Negotiation Response dialog token doesn't match");
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	if (resp_info.status != P2P_STATUS_SUCCESS) {
		if (resp_info.status == P2P_STATUS_FAIL_INFO_NOT_AVAIL) {
			/* Give the peer 120s to restart the GO Negotiation */
			l_error("P2P_STATUS_FAIL_INFO_NOT_AVAIL: Will wait for "
				"a new GO Negotiation Request before declaring "
				"failure");
			dev->conn_go_neg_req_timeout = l_timeout_create(120,
						p2p_go_neg_req_timeout, dev,
						p2p_go_neg_req_timeout_destroy);
			p2p_device_discovery_start(dev);
			goto p2p_free;
		}

		l_error("GO Negotiation Response status %i", resp_info.status);
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	/*
	 * 3.1.4.2: "The Tie breaker bit in a GO Negotiation Response frame
	 * shall be toggled from the corresponding GO Negotiation Request
	 * frame."
	 */
	if (resp_info.go_tie_breaker == dev->conn_go_tie_breaker) {
		l_error("GO Negotiation Response tie breaker value wrong");
		/* Proceed anyway */
		dev->conn_go_tie_breaker = !resp_info.go_tie_breaker;
	}

	dev->is_go = P2P_GO_INTENT * 2 + dev->conn_go_tie_breaker >
		resp_info.go_intent * 2;

	if ((resp_info.capability.group_caps & P2P_GROUP_CAP_PERSISTENT_GROUP)
			&& !dev->is_go) {
		l_error("Persistent groups not supported");
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	if (resp_info.device_password_id != dev->conn_password_id) {
		l_error("GO Negotiation Response WSC device password ID wrong");
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	if (!p2p_device_validate_channel_list(dev, &resp_info.channel_list,
						&resp_info.operating_channel)) {
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	if (dev->is_go) {
		const struct l_queue_entry *entry;
		const struct p2p_channel_entries *entries;
		int i;

		/*
		 * Check that our listen channel is in the set supported by the
		 * Client.
		 * TODO: if it's not, look for a different channel.
		 */
		for (entry = l_queue_get_entries(
					resp_info.channel_list.channel_entries);
				entry; entry = entry->next) {
			entries = entry->data;

			if (entries->oper_class == dev->listen_oper_class)
				break;
		}

		if (!entry) {
			l_error("Our Operating Class not listed in "
				"the GO Negotiation Response");
			p2p_connect_failed(dev);
			goto p2p_free;
		}

		for (i = 0; i < entries->n_channels; i++)
			if (entries->channels[i] == dev->listen_channel)
				break;

		if (i == entries->n_channels) {
			l_error("Our listen channel not listed in "
				"the GO Negotiation Response");
			p2p_connect_failed(dev);
			goto p2p_free;
		}
	}

	/* Check whether WFD IE is required, validate it if present */
	if (!p2p_device_validate_conn_wfd(dev, resp_info.wfd,
						resp_info.wfd_size)) {
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	memcpy(dev->conn_peer_interface_addr, resp_info.intended_interface_addr,
		6);

	if (dev->is_go) {
		struct l_queue *channel_list = l_queue_new();
		struct p2p_channel_entries *channel_entries =
			l_malloc(sizeof(struct p2p_channel_entries) + 1);

		p2p_set_group_id(dev);

		dev->conn_config_delay =
			resp_info.config_timeout.client_config_timeout * 10;

		channel_entries->oper_class = dev->listen_oper_class;
		channel_entries->n_channels = 1;
		channel_entries->channels[0] = dev->listen_channel;
		l_queue_push_tail(channel_list, channel_entries);

		/* Build and send the GO Negotiation Confirmation */
		confirm_info.capability = dev->capability;
		memcpy(confirm_info.operating_channel.country,
			dev->listen_country, 3);
		confirm_info.operating_channel.oper_class = dev->listen_oper_class;
		confirm_info.operating_channel.channel_num = dev->listen_channel;
		memcpy(confirm_info.channel_list.country, dev->listen_country, 3);
		confirm_info.channel_list.channel_entries = channel_list;
		memcpy(&confirm_info.group_id, &dev->go_group_id,
			sizeof(struct p2p_group_id_attr));
	} else {
		band = band_oper_class_to_band(
			(const uint8_t *) resp_info.operating_channel.country,
			resp_info.operating_channel.oper_class);
		frequency = band_channel_to_freq(
					resp_info.operating_channel.channel_num,
					band);
		if (!frequency) {
			l_error("Bad operating channel in GO Negotiation Response");
			p2p_connect_failed(dev);
			goto p2p_free;
		}

		dev->conn_config_delay =
			resp_info.config_timeout.go_config_timeout * 10;
		dev->conn_go_oper_freq = frequency;
		memcpy(&dev->go_group_id, &resp_info.group_id,
			sizeof(struct p2p_group_id_attr));

		/* Build and send the GO Negotiation Confirmation */
		confirm_info.capability.device_caps = 0;	/* Reserved */
		confirm_info.capability.group_caps = 0;		/* Reserved */
		confirm_info.operating_channel = resp_info.operating_channel;
		confirm_info.channel_list = resp_info.channel_list;
		resp_info.channel_list.channel_entries = NULL;
	}

	confirm_info.dialog_token = resp_info.dialog_token;
	confirm_info.status = P2P_STATUS_SUCCESS;

	if (dev->conn_own_wfd) {
		confirm_info.wfd = wfd_ie;
		confirm_info.wfd_size = p2p_build_wfd_ie(dev->conn_own_wfd,
								NULL, wfd_ie);
	}

	confirm_body = p2p_build_go_negotiation_confirmation(&confirm_info,
								&confirm_len);
	confirm_info.wfd = NULL;
	p2p_clear_go_negotiation_confirmation(&confirm_info);

	if (!confirm_body) {
		p2p_connect_failed(dev);
		goto p2p_free;
	}

	iov[iov_len].iov_base = confirm_body;
	iov[iov_len].iov_len = confirm_len;
	iov_len++;

	iov[iov_len].iov_base = NULL;

	p2p_peer_frame_xchg(dev->conn_peer, iov, dev->conn_peer->device_addr,
				0, 0, 0, false, FRAME_GROUP_P2P_CONNECT,
				p2p_go_negotiation_confirm_done, NULL);
	l_free(confirm_body);

p2p_free:
	p2p_clear_go_negotiation_resp(&resp_info);
	return true;
}

static void p2p_go_negotiation_req_done(int error, void *user_data)
{
	struct p2p_device *dev = user_data;

	if (error)
		l_error("Sending the GO Negotiation Req failed: %s (%i)",
			strerror(-error), -error);
	else
		l_error("No GO Negotiation Response after Request ACKed");

	p2p_connect_failed(dev);
}

static void p2p_start_go_negotiation(struct p2p_device *dev)
{
	struct p2p_go_negotiation_req info = {};
	uint8_t *req_body;
	size_t req_len;
	uint8_t wfd_ie[32];
	struct iovec iov[16];
	int iov_len = 0;
	/*
	 * Devices should respond within 100ms but times of ~400ms are
	 * often seen instead.
	 *
	 * 3.1.4.2: "The P2P Device that sent the Group Owner Negotiation
	 * frame shall assume that Group Owner Negotiation failed and is
	 * complete if it does not receive the next frame in the exchange
	 * within 100 milliseconds of receiving an acknowledgement frame."
	 */
	unsigned int resp_timeout = 600;

	dev->conn_go_tie_breaker = dev->next_tie_breaker++ & 1;

	info.dialog_token = 1;
	info.capability = dev->capability;
	info.go_intent = P2P_GO_INTENT;
	info.go_tie_breaker = dev->conn_go_tie_breaker;
	info.config_timeout.go_config_timeout = 50;	/* 500ms */
	info.config_timeout.client_config_timeout = 50;	/* 500ms */
	memcpy(info.listen_channel.country, dev->listen_country, 3);
	info.listen_channel.oper_class = dev->listen_oper_class;
	info.listen_channel.channel_num = dev->listen_channel;
	memcpy(info.intended_interface_addr, dev->conn_addr, 6);

	/*
	 * Even if P2P_GO_INTENT is 0, we have to include our supported
	 * channels because the peer can only choose their own channels
	 * from our list.
	 */
	p2p_device_fill_channel_list(dev, &info.channel_list);
	memcpy(info.operating_channel.country, dev->listen_country, 3);
	info.operating_channel.oper_class = dev->listen_oper_class;
	info.operating_channel.channel_num = dev->listen_channel;
	info.device_info = dev->device_info;
	info.device_password_id = dev->conn_password_id;

	if (dev->conn_own_wfd) {
		info.wfd = wfd_ie;
		info.wfd_size = p2p_build_wfd_ie(dev->conn_own_wfd,
							NULL, wfd_ie);
	}

	req_body = p2p_build_go_negotiation_req(&info, &req_len);
	info.wfd = NULL;
	p2p_clear_go_negotiation_req(&info);

	if (!req_body) {
		p2p_connect_failed(dev);
		return;
	}

	iov[iov_len].iov_base = req_body;
	iov[iov_len].iov_len = req_len;
	iov_len++;

	iov[iov_len].iov_base = NULL;

	p2p_peer_frame_xchg(dev->conn_peer, iov, dev->conn_peer->device_addr,
				100, resp_timeout, 256, false,
				FRAME_GROUP_P2P_CONNECT,
				p2p_go_negotiation_req_done,
				&p2p_frame_go_neg_resp,
				p2p_go_negotiation_resp_cb, NULL);
	l_free(req_body);
}

static bool p2p_provision_disc_resp_cb(const struct mmpdu_header *mpdu,
					const void *body, size_t body_len,
					int rssi, struct p2p_device *dev)
{
	struct p2p_provision_discovery_resp info;
	int r;

	l_debug("");

	if (!dev->conn_peer)
		return true;

	if (body_len < 8) {
		l_error("Provision Discovery Response frame too short");
		p2p_connect_failed(dev);
		return true;
	}

	r = p2p_parse_provision_disc_resp(body + 7, body_len - 7, &info);
	if (r < 0) {
		l_error("Provision Discovery Response parse error %s (%i)",
			strerror(-r), -r);
		p2p_connect_failed(dev);
		return true;
	}

	if (info.dialog_token != 2) {
		l_error("Provision Discovery Response dialog token doesn't "
			"match");
		p2p_connect_failed(dev);
		return true;
	}

	if (info.wsc_config_method != dev->conn_config_method) {
		l_error("Provision Discovery Response WSC device password ID "
			"wrong");
		p2p_connect_failed(dev);
		return true;
	}

	/* Check whether WFD IE is required, validate it if present */
	if (!p2p_device_validate_conn_wfd(dev, info.wfd, info.wfd_size)) {
		p2p_connect_failed(dev);
		return true;
	}

	/*
	 * If we're not joining an existing group, continue with Group
	 * Formation now.
	 */
	if (!dev->conn_peer->group) {
		p2p_start_go_negotiation(dev);
		return true;
	}

	/*
	 * Indended P2P Interface address is optional, we don't have the
	 * BSSID of the group here.
	 *
	 * We might want to make sure that Group Formation is false but the
	 * Capability attribute is also optional.
	 */
	dev->conn_go_oper_freq = dev->conn_peer->bss->frequency;
	memset(dev->conn_peer_interface_addr, 0, 6);
	memcpy(dev->go_group_id.device_addr, dev->conn_peer->device_addr, 6);
	l_strlcpy(dev->go_group_id.ssid,
			(const char *) dev->conn_peer->bss->ssid,
			dev->conn_peer->bss->ssid_len + 1);

	/* Ready to start WSC */
	p2p_start_client_provision(dev);
	return true;
}

static void p2p_provision_disc_req_done(int error, void *user_data)
{
	struct p2p_device *dev = user_data;

	if (error)
		l_error("Sending the Provision Discovery Req failed: %s (%i)",
			strerror(-error), -error);
	else
		l_error("No Provision Discovery Response after Request ACKed");

	p2p_connect_failed(dev);
}

static void p2p_start_provision_discovery(struct p2p_device *dev)
{
	struct p2p_provision_discovery_req info = { .status = -1 };
	uint8_t *req_body;
	size_t req_len;
	uint8_t wfd_ie[32];
	struct iovec iov[16];
	int iov_len = 0;

	/* This frame is pretty simple when P2Ps isn't supported */
	info.dialog_token = 2;
	info.capability = dev->capability;
	info.device_info = dev->device_info;

	if (dev->conn_peer->group) {
		memcpy(info.group_id.device_addr, dev->conn_peer->bss->addr, 6);
		memcpy(info.group_id.ssid, dev->conn_peer->bss->ssid,
			dev->conn_peer->bss->ssid_len);
	}

	info.wsc_config_method = dev->conn_config_method;

	if (dev->conn_own_wfd) {
		info.wfd = wfd_ie;
		info.wfd_size = p2p_build_wfd_ie(dev->conn_own_wfd,
							NULL, wfd_ie);
	}

	req_body = p2p_build_provision_disc_req(&info, &req_len);
	info.wfd = NULL;
	p2p_clear_provision_disc_req(&info);

	if (!req_body) {
		p2p_connect_failed(dev);
		return;
	}

	iov[iov_len].iov_base = req_body;
	iov[iov_len].iov_len = req_len;
	iov_len++;

	iov[iov_len].iov_base = NULL;

	/*
	 * Section 3.2.3: "The Provision Discovery Request frame shall be
	 * sent to the P2P Device Address of the P2P Group Owner"
	 */
	p2p_peer_frame_xchg(dev->conn_peer, iov, dev->conn_peer->device_addr,
				200, 600, 8, false, FRAME_GROUP_P2P_CONNECT,
				p2p_provision_disc_req_done,
				&p2p_frame_pd_resp, p2p_provision_disc_resp_cb,
				NULL);
	l_free(req_body);
}

static bool p2p_peer_get_info(struct p2p_peer *peer,
				uint16_t *wsc_config_methods,
				struct p2p_capability_attr **capability)
{
	struct wsc_probe_request wsc_info;

	switch (peer->bss->source_frame) {
	case SCAN_BSS_PROBE_RESP:
		if (!peer->bss->p2p_probe_resp_info)
			return false;

		if (wsc_config_methods)
			*wsc_config_methods = peer->bss->p2p_probe_resp_info->
				device_info.wsc_config_methods;

		*capability = &peer->bss->p2p_probe_resp_info->capability;
		return true;
	case SCAN_BSS_PROBE_REQ:
		if (!peer->bss->p2p_probe_req_info || !peer->bss->wsc)
			return false;

		if (wsc_parse_probe_request(peer->bss->wsc, peer->bss->wsc_size,
						&wsc_info) < 0)
			return false;

		if (wsc_config_methods)
			*wsc_config_methods = wsc_info.config_methods;

		*capability = &peer->bss->p2p_probe_req_info->capability;
		return true;
	case SCAN_BSS_BEACON:
		if (!peer->bss->p2p_beacon_info || !peer->bss->wsc)
			return false;

		if (wsc_parse_probe_request(peer->bss->wsc, peer->bss->wsc_size,
						&wsc_info) < 0)
			return false;

		if (wsc_config_methods)
			*wsc_config_methods = wsc_info.config_methods;

		*capability = &peer->bss->p2p_beacon_info->capability;
		break;
	}

	return false;
}

static void p2p_peer_connect(struct p2p_peer *peer, const char *pin)
{
	struct p2p_device *dev = peer->dev;
	uint16_t wsc_config_methods;
	struct p2p_capability_attr *capability;
	struct l_dbus_message *message = peer->wsc.pending_connect;
	struct l_dbus_message *reply;

	if (dev->conn_peer) {
		reply = dbus_error_busy(message);
		goto send_error;
	}

	/*
	 * Step 1, check if the device indicates it supports our WSC method
	 * and check other flags to make sure a connection is possible.
	 */
	if (!p2p_peer_get_info(peer, &wsc_config_methods, &capability)) {
		reply = dbus_error_failed(message);
		goto send_error;
	}

	dev->conn_config_method = pin ? WSC_CONFIGURATION_METHOD_KEYPAD :
		WSC_CONFIGURATION_METHOD_PUSH_BUTTON;
	dev->conn_password_id = pin ?
		(strlen(pin) == 4 || wsc_pin_is_checksum_valid(pin) ?
		 WSC_DEVICE_PASSWORD_ID_DEFAULT :
		 WSC_DEVICE_PASSWORD_ID_USER_SPECIFIED) :
		WSC_DEVICE_PASSWORD_ID_PUSH_BUTTON;

	if (!(wsc_config_methods & dev->conn_config_method)) {
		reply = dbus_error_not_supported(message);
		goto send_error;
	}

	if (capability->device_caps & P2P_DEVICE_CAP_DEVICE_LIMIT) {
		reply = dbus_error_not_supported(message);
		goto send_error;
	}

	if (capability->group_caps & P2P_GROUP_CAP_GROUP_LIMIT) {
		reply = dbus_error_not_supported(message);
		goto send_error;
	}

	if (capability->group_caps & P2P_GROUP_CAP_GROUP_FORMATION) {
		reply = dbus_error_busy(message);
		goto send_error;
	}

	/*
	 * Check WFD role compatibility.  At least one of the devices
	 * (device A) must be non-dual-role and device B must implement the
	 * role that A does not.  peer->wfd and p2p_own_wfd have both been
	 * validated and we know each device implements at least one role.
	 */
	if (p2p_own_wfd && p2p_own_wfd->available && peer->wfd) {
		if (!(
				(!peer->wfd->source && p2p_own_wfd->source) ||
				(!peer->wfd->sink && p2p_own_wfd->sink) ||
				(!p2p_own_wfd->source && peer->wfd->source) ||
				(!p2p_own_wfd->sink && peer->wfd->sink))) {
			l_error("Incompatible WFD roles");
			reply = dbus_error_not_supported(message);
			goto send_error;
		}
	}

	p2p_device_discovery_stop(dev);

	/* Generate the interface address for our P2P-Client connection */
	wiphy_generate_random_address(dev->wiphy, dev->conn_addr);

	dev->conn_peer = peer; /* No ref counting so just set the pointer */
	dev->conn_pin = l_strdup(pin);
	dev->connections_left--;
	l_dbus_property_changed(dbus_get_bus(), p2p_device_get_path(dev),
				IWD_P2P_INTERFACE, "AvailableConnections");

	if (p2p_own_wfd && p2p_own_wfd->available && peer->wfd) {
		dev->conn_own_wfd = l_memdup(p2p_own_wfd, sizeof(*p2p_own_wfd));

		/*
		 * From now on we'll appear as SESSION_NOT_AVAILABLE to other
		 * peers but as SESSION_AVAILABLE to conn_peer.
		 */
		p2p_own_wfd->available = false;

		/* If peer is R1, fall back to R1 as well */
		dev->conn_own_wfd->r2 = p2p_own_wfd->r2 && peer->wfd->r2;

		/*
		 * If we're a dual-role device, we have to select our role
		 * for this connection now.
		 */
		if (p2p_own_wfd->source && p2p_own_wfd->sink) {
			dev->conn_own_wfd->source = !peer->wfd->source;
			dev->conn_own_wfd->sink = !peer->wfd->sink;
		}
	}

	/*
	 * Step 2, if peer is already a GO then send the Provision Discovery
	 * before doing WSC.  If it's not then do Provision Discovery
	 * optionally as seems to be required by some implementations, and
	 * start GO negotiation following that.
	 * TODO: Add a AlwaysUsePD config setting.
	 */
	if (dev->conn_peer->group)
		p2p_start_provision_discovery(dev);
	else
		p2p_start_go_negotiation(dev);

	return;

send_error:
	dbus_pending_reply(&peer->wsc.pending_connect, reply);
}

static void p2p_peer_disconnect_cb(struct netdev *netdev, bool result,
					void *user_data)
{
	struct p2p_peer *peer = user_data;
	struct p2p_device *dev = peer->dev;

	if (!peer->wsc.pending_cancel || !dev->disconnecting)
		return;

	dbus_pending_reply(&peer->wsc.pending_cancel,
				l_dbus_message_new_method_return(
						peer->wsc.pending_cancel));

	/* Independent of the result this will just drop the whole netdev */
	p2p_connection_reset(dev);
}

static void p2p_peer_disconnect(struct p2p_peer *peer)
{
	struct p2p_device *dev = peer->dev;
	struct l_dbus_message *message = peer->wsc.pending_cancel;
	struct l_dbus_message *reply;

	if (dev->conn_peer != peer) {
		reply = dbus_error_not_connected(message);
		goto send_reply;
	}

	if (dev->disconnecting) {
		reply = dbus_error_busy(message);
		goto send_reply;
	}

	if (peer->wsc.pending_connect)
		dbus_pending_reply(&peer->wsc.pending_connect,
				dbus_error_aborted(peer->wsc.pending_connect));

	if (p2p_peer_operational(peer)) {
		l_dbus_property_changed(dbus_get_bus(), p2p_peer_get_path(peer),
					IWD_P2P_PEER_INTERFACE, "Connected");
		l_dbus_property_changed(dbus_get_bus(), p2p_peer_get_path(peer),
					IWD_P2P_PEER_INTERFACE,
					"ConnectedInterface");
		l_dbus_property_changed(dbus_get_bus(), p2p_peer_get_path(peer),
					IWD_P2P_PEER_INTERFACE,
					"ConnectedIP");
	}

	dev->disconnecting = true;

	if (dev->conn_enrollee) {
		wsc_enrollee_cancel(dev->conn_enrollee, true);
		return;
	}

	if (dev->conn_netdev && dev->conn_retry_count) {
		/* Note: in theory we need to add the P2P IEs here too */
		if (netdev_disconnect(dev->conn_netdev, p2p_peer_disconnect_cb,
					peer) == 0)
			return;

		l_error("netdev_disconnect failed");
	}

	p2p_connection_reset(dev);
	reply = l_dbus_message_new_method_return(message);

send_reply:
	dbus_pending_reply(&peer->wsc.pending_cancel, reply);
}

#define SCAN_INTERVAL_MAX	3
#define SCAN_INTERVAL_STEP	1
#define CHANS_PER_SCAN_INITIAL	2
#define CHANS_PER_SCAN		2

static bool p2p_device_scan_start(struct p2p_device *dev);
static void p2p_device_roc_start(struct p2p_device *dev);

static void p2p_device_roc_timeout(struct l_timeout *timeout, void *user_data)
{
	struct p2p_device *dev = user_data;

	l_timeout_remove(dev->scan_timeout);

	if (time(NULL) < dev->next_scan_ts) {
		/*
		 * dev->scan_timeout destroy function will have been called
		 * by now so it won't overwrite the new timeout set by
		 * p2p_device_roc_start.
		 */
		p2p_device_roc_start(dev);
		return;
	}

	p2p_device_scan_start(dev);
}

static void p2p_device_roc_cancel(struct p2p_device *dev)
{
	struct l_genl_msg *msg;

	if (!dev->have_roc_cookie)
		return;

	l_debug("");

	msg = l_genl_msg_new_sized(NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL, 32);
	l_genl_msg_append_attr(msg, NL80211_ATTR_WDEV, 8, &dev->wdev_id);
	l_genl_msg_append_attr(msg, NL80211_ATTR_COOKIE, 8, &dev->roc_cookie);
	l_genl_family_send(dev->nl80211, msg, NULL, NULL, NULL);

	dev->have_roc_cookie = false;
}

static void p2p_scan_timeout_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->scan_timeout = NULL;

	if (dev->nl80211) {
		/*
		 * Most likely when the timer expires the ROC period
		 * has finished but send a cancel command to make sure,
		 * as well as handle situations like disabling P2P.
		 */
		p2p_device_roc_cancel(dev);
	}
}

static void p2p_device_roc_cb(struct l_genl_msg *msg, void *user_data)
{
	struct p2p_device *dev = user_data;
	uint64_t cookie;
	int error = l_genl_msg_get_error(msg);

	l_debug("ROC: %s (%i)", strerror(-error), -error);

	if (error)
		return;

	if (nl80211_parse_attrs(msg, NL80211_ATTR_COOKIE, &cookie,
				NL80211_ATTR_UNSPEC) < 0)
		return;

	dev->roc_cookie = cookie;
	dev->have_roc_cookie = true;

	/*
	 * Has the command taken so long that P2P has been since disabled
	 * or the timeout otherwise ran out?
	 */
	if (!dev->scan_timeout)
		p2p_device_roc_cancel(dev);
}

static void p2p_device_roc_start(struct p2p_device *dev)
{
	struct l_genl_msg *msg;
	uint32_t listen_freq;
	uint32_t duration;
	uint32_t cmd_id;

	l_debug("");

	/*
	 * One second granularity is fine here because some randomess
	 * is desired and the intervals don't have strictly defined
	 * limits.
	 */
	duration = (dev->next_scan_ts - time(NULL)) * 1000;

	if (duration < 200)
		duration = 200;

	/*
	 * Driver max duration seems to be 5000ms or more for all drivers
	 * except mac80211_hwsim where it is only 1000ms.
	 */
	if (duration > wiphy_get_max_roc_duration(dev->wiphy))
		duration = wiphy_get_max_roc_duration(dev->wiphy);

	/*
	 * Some drivers seem to miss fewer frames if we start new requests
	 * often.
	 */
	if (duration > 1000)
		duration = 1000;

	/*
	 * Be on our listen channel, even if we're still in the 120s
	 * waiting period after a locally-initiated GO Negotiation and
	 * waiting for the peer's GO Negotiation Request.  It's not
	 * totally clear that this is how the spec intended this
	 * mechanism to work.  On one hand 3.1.4.1 says this:
	 * "A P2P Device may start Group Owner Negotiation by sending a
	 * GO Negotiation Request frame after receiving a Probe Request
	 * frame from the target P2P Device."
	 * and the Appendix D. scenarios also show GO Negotiation happening
	 * on the initiator's listen channel directly after the reception
	 * of the Probe Request from the target.  But:
	 *  1. in 3.1.4.1 that is a MAY and doesn't exclude starting GO
	 *     Negotiation also on the target's listen channel.
	 *  2. not all devices use the search state so we may never
	 *     receive a Probe Request and may end up waiting indefinitely.
	 *  3. the time the peer spends on each channel in the scan state
	 *     may be too short for the peer to receive the GO Negotiation
	 *     Request after the Probe Request before moving to the next
	 *     channel.
	 *  4. since we know the target is going to spend some time on
	 *     their own listen channel, using that channel should work in
	 *     every case.
	 *
	 * We also have this in 3.1.4.1:
	 * "When the P2P Devices arrive on a common channel and begin Group
	 * Owner Negotiation, they shall stay on that channel until Group
	 * Owner Negotiation completes."
	 * telling us that the whole negotiation should be happening on
	 * one channel seemingly supporting the new GO Negotiation being on
	 * the same channel as the original failed GO Negotiation.
	 * However the rest of the spec makes it clear they are not treated
	 * as a single GO Negotiation:
	 * 3.1.4.2:
	 * "Group Owner Negotiation is a three way frame exchange"
	 * 3.1.4.2.2:
	 * "Group Formation ends on transmission or reception of a GO
	 * Negotiation Response frame with the Status Code set to a value
	 * other than Success."
	 *
	 * 3.1.4.1 implies frame exchanges happen on the target device's
	 * Listen Channel, not our Listen Channel:
	 * "Prior to beginning the Group Formation Procedure the P2P Device
	 * shall arrive on a common channel with the target P2P Device.
	 * The Find Phase in In-band Device Discovery or Out-of-Band Device
	 * Discovery may be used for this purpose. In the former case, the
	 * P2P Device only needs to scan the Listen Channel of the target
	 * P2P Device, as opposed to all of the Social Channels."
	 *
	 * All in all we transmit our Negotiation Requests on the peer's
	 * listen channel since it is bound to spend more time on that
	 * channel than on any other channel and then we listen for a
	 * potential GO Negotiation restart on our listen channel.
	 */
	listen_freq = band_channel_to_freq(dev->listen_channel,
						BAND_FREQ_2_4_GHZ);

	msg = l_genl_msg_new_sized(NL80211_CMD_REMAIN_ON_CHANNEL, 64);
	l_genl_msg_append_attr(msg, NL80211_ATTR_WDEV, 8, &dev->wdev_id);
	l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &listen_freq);
	l_genl_msg_append_attr(msg, NL80211_ATTR_DURATION, 4, &duration);

	cmd_id = l_genl_family_send(dev->nl80211, msg, p2p_device_roc_cb, dev,
					NULL);
	if (!cmd_id)
		l_genl_msg_unref(msg);

	/*
	 * Time out after @duration ms independent of whether we were able to
	 * start the ROC command.  If we receive the CMD_REMAIN_ON_CHANNEL
	 * event we'll update the timeout to give the ROC command enough time
	 * to finish.  On an error or if we time out before the ROC command
	 * even starts, we'll just retry after @duration ms so we don't even
	 * need to handle errors specifically.
	 */
	dev->scan_timeout = l_timeout_create_ms(duration,
						p2p_device_roc_timeout, dev,
						p2p_scan_timeout_destroy);
	dev->listen_duration = duration;
	dev->have_roc_cookie = false;

	l_debug("started a ROC command on channel %i for %i ms",
		(int) dev->listen_channel, (int) duration);
}

static void p2p_peer_update_wfd(struct p2p_peer *peer,
				struct p2p_wfd_properties *new_wfd)
{
	struct p2p_wfd_properties *orig_wfd = peer->wfd;

	if (!orig_wfd && !new_wfd)
		return;

	peer->wfd = new_wfd ? l_memdup(new_wfd, sizeof(*new_wfd)) : NULL;

	if (!orig_wfd && new_wfd) {
		l_dbus_object_add_interface(dbus_get_bus(),
						p2p_peer_get_path(peer),
						IWD_P2P_WFD_INTERFACE, peer);
		return;
	} else if (orig_wfd && !new_wfd) {
		l_free(orig_wfd);
		l_dbus_object_remove_interface(dbus_get_bus(),
						p2p_peer_get_path(peer),
						IWD_P2P_WFD_INTERFACE);
		return;
	}

	if (orig_wfd->source != new_wfd->source)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE, "Source");

	if (orig_wfd->sink != new_wfd->sink)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE, "Sink");

	if (orig_wfd->port != new_wfd->port)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE, "Port");

	if (orig_wfd->audio != new_wfd->audio)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE, "HasAudio");

	if (orig_wfd->uibc != new_wfd->uibc)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE, "HasUIBC");

	if (orig_wfd->cp != new_wfd->cp)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_peer_get_path(peer),
					IWD_P2P_WFD_INTERFACE,
					"HasContentProtection");

	l_free(orig_wfd);
}

static const char *p2p_peer_wsc_get_path(struct wsc_dbus *wsc)
{
	return p2p_peer_get_path(l_container_of(wsc, struct p2p_peer, wsc));
}

static void p2p_peer_wsc_connect(struct wsc_dbus *wsc, const char *pin)
{
	p2p_peer_connect(l_container_of(wsc, struct p2p_peer, wsc), pin);
}

static void p2p_peer_wsc_cancel(struct wsc_dbus *wsc)
{
	p2p_peer_disconnect(l_container_of(wsc, struct p2p_peer, wsc));
}

static void p2p_peer_wsc_remove(struct wsc_dbus *wsc)
{
	/*
	 * The WSC removal is triggered in p2p_peer_put so we call
	 * p2p_peer_free directly from there too.
	 */
}

static bool p2p_device_peer_add(struct p2p_device *dev, struct p2p_peer *peer)
{
	struct p2p_wfd_properties wfd;

	if (!strlen(peer->name) || !l_utf8_validate(
					peer->name, strlen(peer->name), NULL)) {
		l_debug("Device name doesn't validate for bssid %s",
			util_address_to_string(peer->bss->addr));
		return false;
	}

	if (!l_dbus_object_add_interface(dbus_get_bus(),
						p2p_peer_get_path(peer),
						IWD_P2P_PEER_INTERFACE, peer)) {
		l_debug("Unable to add the %s interface to %s",
			IWD_P2P_PEER_INTERFACE, p2p_peer_get_path(peer));
		return false;
	}

	if (!l_dbus_object_add_interface(dbus_get_bus(),
						p2p_peer_get_path(peer),
						L_DBUS_INTERFACE_PROPERTIES,
						NULL)) {
		l_dbus_unregister_object(dbus_get_bus(),
						p2p_peer_get_path(peer));
		l_debug("Unable to add the %s interface to %s",
			L_DBUS_INTERFACE_PROPERTIES, p2p_peer_get_path(peer));
		return false;
	}

	peer->wsc.get_path = p2p_peer_wsc_get_path;
	peer->wsc.connect = p2p_peer_wsc_connect;
	peer->wsc.cancel = p2p_peer_wsc_cancel;
	peer->wsc.remove = p2p_peer_wsc_remove;

	if (!wsc_dbus_add_interface(&peer->wsc)) {
		l_dbus_unregister_object(dbus_get_bus(),
						p2p_peer_get_path(peer));
		return false;
	}

	/*
	 * We need to either only show peers that are available for a WFD
	 * session, or expose the availability information through a property,
	 * which we are not doing right now.
	 */
	if (p2p_own_wfd && p2p_extract_wfd_properties(peer->bss->wfd,
						peer->bss->wfd_size, &wfd) &&
			wfd.available)
		p2p_peer_update_wfd(peer, &wfd);

	l_queue_push_tail(dev->peer_list, peer);

	return true;
}

struct p2p_peer_move_data {
	struct l_queue *new_list;
	struct p2p_peer *conn_peer;
	uint64_t now;
};

static bool p2p_peer_move_recent(void *data, void *user_data)
{
	struct p2p_peer *peer = data;
	struct p2p_peer_move_data *move_data = user_data;

	if (move_data->now > peer->bss->time_stamp + 30 * L_USEC_PER_SEC &&
			peer != move_data->conn_peer)
		return false;	/* Old, keep on the list */

	/* Recently seen or currently connected, move to the new list */
	l_queue_push_tail(move_data->new_list, peer);
	return true;
}

static bool p2p_peer_update_existing(struct scan_bss *bss,
					struct l_queue *old_list,
					struct l_queue *new_list)
{
	struct p2p_peer *peer;
	struct p2p_wfd_properties wfd;

	peer = l_queue_remove_if(old_list, p2p_peer_match, bss->addr);
	if (!peer)
		return false;

	/*
	 * We've seen this peer already, only update the scan_bss object
	 * and WFD state.  We can update peer->bss even if
	 * peer == peer->dev->conn_peer because its .bss is not used by
	 * .conn_netdev or .conn_enrollee.  .conn_wsc_bss is used for
	 * both connections and it doesn't come from the discovery scan
	 * results.
	 * Some property changes may need to be notified here.
	 */

	if (bss->source_frame == SCAN_BSS_PROBE_RESP)
		peer->device_addr =
			bss->p2p_probe_resp_info->device_info.device_addr;
	else if (bss->source_frame == SCAN_BSS_PROBE_REQ && !l_memeqzero(
			bss->p2p_probe_req_info->device_info.device_addr, 6))
		peer->device_addr =
			bss->p2p_probe_req_info->device_info.device_addr;
	else
		peer->device_addr = bss->addr;

	scan_bss_free(peer->bss);
	peer->bss = bss;

	if (p2p_own_wfd && p2p_extract_wfd_properties(bss->wfd, bss->wfd_size,
							&wfd) &&
			wfd.available)
		p2p_peer_update_wfd(peer, &wfd);
	else if (peer->wfd)
		p2p_peer_update_wfd(peer, NULL);

	l_queue_push_tail(new_list, peer);
	return true;
}

static bool p2p_scan_notify(int err, struct l_queue *bss_list,
				const struct scan_freq_set *freqs,
				void *user_data)
{
	struct p2p_device *dev = user_data;
	const struct l_queue_entry *entry;
	struct l_queue *old_peer_list = dev->peer_list;
	struct p2p_peer_move_data move_data;

	if (err) {
		l_debug("P2P scan failed: %s (%i)", strerror(-err), -err);
		goto schedule;
	}

	dev->peer_list = l_queue_new();

	for (entry = l_queue_get_entries(bss_list); entry;
			entry = entry->next) {
		struct scan_bss *bss = entry->data;
		struct p2p_peer *peer;

		if (bss->source_frame != SCAN_BSS_PROBE_RESP ||
				!bss->p2p_probe_resp_info) {
			scan_bss_free(bss);
			continue;
		}

		if (p2p_peer_update_existing(bss, old_peer_list,
						dev->peer_list))
			continue;

		peer = l_new(struct p2p_peer, 1);
		peer->dev = dev;
		peer->bss = bss;
		peer->name = l_strdup(bss->p2p_probe_resp_info->
						device_info.device_name);
		peer->primary_device_type =
			bss->p2p_probe_resp_info->device_info.primary_device_type;
		peer->group =
			!!(bss->p2p_probe_resp_info->capability.group_caps &
			   P2P_GROUP_CAP_GO);
		/*
		 * Both P2P Devices and GOs can send Probe Responses so the
		 * frame's source address may not necessarily be the Device
		 * Address, use what's in the obligatory Device Info.
		 */
		peer->device_addr =
			bss->p2p_probe_resp_info->device_info.device_addr;

		if (!p2p_device_peer_add(dev, peer))
			p2p_peer_free(peer);
	}

	/*
	 * old_peer_list now only contains peers not present in the new
	 * results.  Move any peers seen in the last 30 secs to the new
	 * dev->peer_list and unref only the remaining peers.
	 */
	move_data.new_list = dev->peer_list;
	move_data.conn_peer = dev->conn_peer;
	move_data.now = l_time_now();
	l_queue_foreach_remove(old_peer_list, p2p_peer_move_recent, &move_data);
	l_queue_destroy(old_peer_list, p2p_peer_put);
	l_queue_destroy(bss_list, NULL);

schedule:
	/*
	 * Calculate interval between now and when we want the next active
	 * scan to start.  Keep issuing Remain-on-Channel commands of
	 * maximum duration until it's time to start the new scan.
	 * The listen periods are actually like a passive scan except that
	 * instead of listening for Beacons only, we also look at Probe
	 * Requests and Probe Responses because they, too, carry P2P IEs
	 * with all the information we need about peer devices.  Beacons
	 * also do, in case of GOs, but we will already get the same
	 * information from the Probe Responses and (even if we can
	 * receive the beacons in userspace in the first place) we don't
	 * want to handle so many frames.
	 *
	 * According to 3.1.2.1.1 we shall be available in listen state
	 * during Find for at least 500ms continuously at least once in
	 * every 5s.  According to 3.1.2.1.3, the Listen State lasts for
	 * between 1 and 3 one-hundred TU Intervals.
	 *
	 * The Search State duration is implementation dependent.
	 */
	if (dev->scan_interval < SCAN_INTERVAL_MAX)
		dev->scan_interval += SCAN_INTERVAL_STEP;

	dev->next_scan_ts = time(NULL) + dev->scan_interval;

	p2p_device_roc_start(dev);
	return true;
}

static bool p2p_device_scan_start(struct p2p_device *dev)
{
	struct scan_parameters params = {};
	struct scan_freq_set *freqs;
	uint8_t buf[256];
	unsigned int i;

	wiphy_get_reg_domain_country(dev->wiphy, (char *) dev->listen_country);
	dev->listen_country[2] = 4;	/* Table E-4 */
	dev->listen_oper_class = 81;	/* 2.4 band */

	params.extra_ie = p2p_build_scan_ies(dev, buf, sizeof(buf),
						&params.extra_ie_size);
	L_WARN_ON(!params.extra_ie);
	params.flush = true;
	/* P2P Wildcard SSID because we don't need legacy networks to reply */
	params.ssid = (const uint8_t *)"DIRECT-";
	params.ssid_len = strlen("DIRECT-");
	/*
	 * Must send probe requests at 6Mb/s, OFDM only.  The no-CCK rates
	 * flag forces the drivers to do exactly this for 2.4GHz frames.
	 *
	 * "- P2P Devices shall not use 11b rates (1, 2, 5.5, 11 Mbps) for data
	 *   and management frames except:
	 *    * Probe Request frames sent to both P2P Devices and non-P2P
	 *      Devices.
	 * - P2P Devices shall not respond to Probe Request frames that indicate
	 *   support for 11b rates only.
	 * Note 1 - This means that the P2P Group Owner transmits Beacon frames
	 * using OFDM.
	 * Note 2 - This means that the P2P Group Owner transmits Probe Response
	 * frames using OFDM, including frames sent in response to Probe
	 * Requests received at 11b rates from non 11b-only devices.
	 * Note 3 - P2P Devices shall not include 11b rates in the list of
	 * supported rates in Probe Request frame intended only for P2P Devices.
	 * 11b rates may be included in the list of supported rates in Probe
	 * Request frames intended for both P2P Devices and non-P2P Devices."
	 */
	params.no_cck_rates = true;
	freqs = scan_freq_set_new();

	for (i = 0; i < L_ARRAY_SIZE(channels_social); i++) {
		int chan = channels_social[i];
		uint32_t freq = band_channel_to_freq(chan, BAND_FREQ_2_4_GHZ);

		scan_freq_set_add(freqs, freq);
	}

	/*
	 * Instead of doing a single Scan Phase at the beginning of the Device
	 * Discovery and then strictly a Find Phase loop as defined in the
	 * spec, mix both to keep watching for P2P groups on the non-social
	 * channels, slowly going through a few channels at a time in each
	 * Scan State iteration.  Scan dev->chans_per_scan channels each time,
	 * use dev->scan_chan_idx to keep track of which channels we've
	 * visited recently.
	 */
	for (i = 0; i < dev->chans_per_scan; i++) {
		int idx = dev->scan_chan_idx++;
		int chan = channels_scan_2_4_other[idx];
		uint32_t freq = band_channel_to_freq(chan, BAND_FREQ_2_4_GHZ);

		if (dev->scan_chan_idx >=
				L_ARRAY_SIZE(channels_scan_2_4_other)) {
			dev->scan_chan_idx = 0;
			/*
			 * Do fewer channels per scan after we've initially
			 * gone through the 2.4 band.
			 */
			dev->chans_per_scan = CHANS_PER_SCAN;
		}

		scan_freq_set_add(freqs, freq);
	}

	params.freqs = freqs;

	dev->scan_id = scan_active_full(dev->wdev_id, &params, NULL,
					p2p_scan_notify, dev, p2p_scan_destroy);
	scan_freq_set_free(freqs);

	return dev->scan_id != 0;
}

static void p2p_probe_resp_done(int error, void *user_data)
{
	if (error)
		l_error("Sending the Probe Response failed: %s (%i)",
			strerror(-error), -error);
}

static void p2p_device_send_probe_resp(struct p2p_device *dev,
					const uint8_t *dest_addr,
					bool to_conn_peer)
{
	uint8_t resp_buf[64] __attribute__ ((aligned));
	size_t resp_len = 0;
	struct p2p_probe_resp resp_info = {};
	uint8_t *p2p_ie;
	size_t p2p_ie_size;
	struct wsc_probe_response wsc_info = {};
	uint8_t *wsc_data;
	size_t wsc_data_size;
	uint8_t *wsc_ie;
	size_t wsc_ie_size;
	uint8_t wfd_ie[32];
	struct iovec iov[16];
	int iov_len = 0;
	/* TODO: extract some of these from wiphy features */
	uint16_t capability = IE_BSS_CAP_PRIVACY | IE_BSS_CAP_SHORT_PREAMBLE;
	struct mmpdu_header *header;
	uint32_t freq;

	/* Header */
	memset(resp_buf, 0, sizeof(resp_buf));
	header = (void *) resp_buf;
	header->fc.protocol_version = 0;
	header->fc.type = MPDU_TYPE_MANAGEMENT;
	header->fc.subtype = MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE;
	memcpy(header->address_1, dest_addr, 6);	/* DA */
	memcpy(header->address_2, dev->addr, 6);	/* SA */
	memcpy(header->address_3, dev->addr, 6);	/* BSSID */

	resp_len = (const uint8_t *) mmpdu_body(header) - resp_buf;

	resp_len += 8;			/* Timestamp */
	resp_buf[resp_len++] = 0x64;	/* Beacon Interval: 100 TUs */
	resp_buf[resp_len++] = 0x00;
	resp_buf[resp_len++] = capability >> 0;
	resp_buf[resp_len++] = capability >> 8;
	resp_buf[resp_len++] = IE_TYPE_SSID;
	resp_buf[resp_len++] = 7;
	resp_buf[resp_len++] = 'D';
	resp_buf[resp_len++] = 'I';
	resp_buf[resp_len++] = 'R';
	resp_buf[resp_len++] = 'E';
	resp_buf[resp_len++] = 'C';
	resp_buf[resp_len++] = 'T';
	resp_buf[resp_len++] = '-';
	resp_buf[resp_len++] = IE_TYPE_SUPPORTED_RATES;
	resp_buf[resp_len++] = 8;
	resp_buf[resp_len++] = 0x8c;
	resp_buf[resp_len++] = 0x12;
	resp_buf[resp_len++] = 0x18;
	resp_buf[resp_len++] = 0x24;
	resp_buf[resp_len++] = 0x30;
	resp_buf[resp_len++] = 0x48;
	resp_buf[resp_len++] = 0x60;
	resp_buf[resp_len++] = 0x6c;

	resp_info.capability = dev->capability;
	resp_info.device_info = dev->device_info;

	/*
	 * Note the SSID and resp_info.group_clients are not updated with
	 * our group information because we generally won't be in the
	 * Listen State on the P2P Device when running a group.  Otherwise
	 * we'd be sending two Probe Responses, one from the P2P Interface
	 * and another from the P2P Device.  According to this part in
	 * Wi-Fi P2P Technical Specification v1.7 section 3.2.2 it seems
	 * only the P2P Interface is supposed to be sending Probe
	 * Responses in that situation:
	 * "In all Probe Responses that it sends, a P2P Group Owner shall
	 * set the SSID to the SSID of the group, and shall set the SA and
	 * BSSID to its P2P Interface Address."
	 */

	p2p_ie = p2p_build_probe_resp(&resp_info, &p2p_ie_size);
	if (!p2p_ie) {
		l_error("Can't build our Probe Response P2P IE");
		return;
	}

	if (to_conn_peer) {
		wsc_info.device_password_id = dev->conn_password_id;
		wsc_info.config_methods = dev->conn_config_method;
		wsc_uuid_from_addr(dev->conn_addr, wsc_info.uuid_e);
	} else {
		wsc_info.config_methods = dev->device_info.wsc_config_methods;
		wsc_uuid_from_addr(dev->addr, wsc_info.uuid_e);
	}

	wsc_info.state = WSC_STATE_NOT_CONFIGURED;
	wsc_info.response_type = WSC_RESPONSE_TYPE_ENROLLEE_INFO;
	wsc_info.serial_number[0] = '0';
	wsc_info.primary_device_type = dev->device_info.primary_device_type;
	l_strlcpy(wsc_info.device_name, dev->device_info.device_name,
			sizeof(wsc_info.device_name));
	wsc_info.rf_bands = WSC_RF_BAND_2_4_GHZ;
	wsc_info.version2 = true;

	wsc_data = wsc_build_probe_response(&wsc_info, &wsc_data_size);
	if (!wsc_data) {
		l_free(p2p_ie);
		l_error("Can't build our Probe Response WSC payload");
		return;
	}

	wsc_ie = ie_tlv_encapsulate_wsc_payload(wsc_data, wsc_data_size,
						&wsc_ie_size);
	l_free(wsc_data);
	if (!wsc_ie) {
		l_free(p2p_ie);
		l_error("Can't build our Probe Response WSC IE");
		return;
	}

	iov[iov_len].iov_base = resp_buf;
	iov[iov_len].iov_len = resp_len;
	iov_len++;

	iov[iov_len].iov_base = p2p_ie;
	iov[iov_len].iov_len = p2p_ie_size;
	iov_len++;

	iov[iov_len].iov_base = wsc_ie;
	iov[iov_len].iov_len = wsc_ie_size;
	iov_len++;

	if (to_conn_peer && dev->conn_own_wfd) {
		iov[iov_len].iov_base = wfd_ie;
		iov[iov_len].iov_len = p2p_build_wfd_ie(dev->conn_own_wfd,
							NULL, wfd_ie);
		iov_len++;
	} else if (p2p_own_wfd) {
		iov[iov_len].iov_base = wfd_ie;
		iov[iov_len].iov_len = p2p_build_wfd_ie(p2p_own_wfd,
							NULL, wfd_ie);
		iov_len++;
	}

	iov[iov_len].iov_base = NULL;

	freq = band_channel_to_freq(dev->listen_channel, BAND_FREQ_2_4_GHZ);
	frame_xchg_start(dev->wdev_id, iov, freq, 0, 0, false, 0,
				p2p_probe_resp_done, dev, NULL, NULL);
	l_debug("Probe Response tx queued");

	l_free(p2p_ie);
	l_free(wsc_ie);
}

static void p2p_device_probe_cb(const struct mmpdu_header *mpdu,
				const void *body, size_t body_len,
				int rssi, void *user_data)
{
	struct p2p_device *dev = user_data;
	struct p2p_peer *peer;
	struct p2p_probe_req p2p_info;
	struct wsc_probe_request wsc_info;
	int r;
	uint8_t *wsc_payload;
	ssize_t wsc_len;
	struct scan_bss *bss;
	struct p2p_channel_attr *channel;
	enum band_freq band;
	uint32_t frequency;
	bool from_conn_peer;

	l_debug("");

	if (!dev->scan_timeout && !dev->scan_id)
		return;

	from_conn_peer =
		dev->conn_go_neg_req_timeout && dev->conn_peer &&
		!memcmp(mpdu->address_2, dev->conn_peer->bss->addr, 6);

	wsc_payload = ie_tlv_extract_wsc_payload(body, body_len, &wsc_len);
	if (!wsc_payload)	/* Not a P2P Probe Req, ignore */
		return;

	r =  wsc_parse_probe_request(wsc_payload, wsc_len, &wsc_info);
	l_free(wsc_payload);

	if (r < 0) {
		l_error("Probe Request WSC IE parse error %s (%i)",
			strerror(-r), -r);

		/*
		 * Ignore requests with erroneous WSC IEs except if they
		 * come from the peer we're currently connecting to as a
		 * workaround for implementations sending invalid Probe
		 * Requests.
		 */
		if (!from_conn_peer)
			return;
	}

	r = p2p_parse_probe_req(body, body_len, &p2p_info);
	if (r < 0) {
		if (r == -ENOENT)	/* Not a P2P Probe Req, ignore */
			return;

		l_error("Probe Request P2P IE parse error %s (%i)",
			strerror(-r), -r);
		return;
	}

	/*
	 * TODO: use ap.c code to check if we match the SSID, BSSID, DSSS
	 * Channel etc. in the Probe Request, and to build the Response body.
	 */
	p2p_device_send_probe_resp(dev, mpdu->address_2, from_conn_peer);

	/*
	 * The peer's listen frequency may be different from ours.
	 * The Listen Channel attribute is optional but if neither
	 * it nor the Operating Channel are set then we have no way
	 * to contact that peer.  Ignore such peers.
	 */
	if (p2p_info.listen_channel.country[0])
		channel = &p2p_info.listen_channel;
	else if (p2p_info.operating_channel.country[0])
		channel = &p2p_info.operating_channel;
	else
		goto p2p_free;

	band = band_oper_class_to_band((const uint8_t *) channel->country,
					channel->oper_class);
	frequency = band_channel_to_freq(channel->channel_num, band);
	if (!frequency)
		goto p2p_free;

	bss = scan_bss_new_from_probe_req(mpdu, body, body_len, frequency,
						rssi);
	if (!bss)
		goto p2p_free;

	bss->time_stamp = l_time_now();

	if (p2p_peer_update_existing(bss, dev->peer_list, dev->peer_list))
		goto p2p_free;

	peer = l_new(struct p2p_peer, 1);
	peer->dev = dev;
	peer->bss = bss;
	peer->name = l_strdup(wsc_info.device_name);
	peer->primary_device_type = wsc_info.primary_device_type;
	peer->group = !!(p2p_info.capability.group_caps & P2P_GROUP_CAP_GO);
	/*
	 * The Device Info attribute is present conditionally so we can't get
	 * the Device Address from there.  In theory only P2P Devices send
	 * out Probe Requests, not P2P GOs, so we assume the source address
	 * is the Device Address.
	 */
	peer->device_addr = bss->addr;

	if (!dev->peer_list)
		dev->peer_list = l_queue_new();

	if (!p2p_device_peer_add(dev, peer))
		p2p_peer_free(peer);

	/*
	 * TODO: check SSID/BSSID are wildcard values if present and
	 * reply with a Probe Response -- not useful in our current usage
	 * scenarios but required by the spec.
	 */

p2p_free:
	p2p_clear_probe_req(&p2p_info);
}

static void p2p_device_discovery_start(struct p2p_device *dev)
{
	if (dev->scan_timeout || dev->scan_id)
		return;

	dev->scan_interval = 1;
	dev->chans_per_scan = CHANS_PER_SCAN_INITIAL;
	dev->scan_chan_idx = 0;

	/*
	 * 3.1.2.1.1: "The Listen Channel shall be chosen at the beginning of
	 * the In-band Device Discovery"
	 *
	 * But keep the old channel if we're still waiting for the peer to
	 * restart the GO Negotiation because there may not be enough time
	 * for the peer to update our Listen Channel value before the user
	 * accepts the connection.  In that case the GO Negotiation Request
	 * would be sent on the old channel.
	 */
	if (!(dev->listen_channel && dev->conn_peer))
		dev->listen_channel = channels_social[l_getrandom_uint32() %
						L_ARRAY_SIZE(channels_social)];

	frame_watch_add(dev->wdev_id, FRAME_GROUP_P2P_LISTEN, 0x0040,
			(uint8_t *) "", 0, p2p_device_probe_cb, dev, NULL);
	frame_watch_add(dev->wdev_id, FRAME_GROUP_P2P_LISTEN, 0x00d0,
			p2p_frame_go_neg_req.data, p2p_frame_go_neg_req.len,
			p2p_device_go_negotiation_req_cb, dev, NULL);

	p2p_device_scan_start(dev);
}

static void p2p_device_discovery_stop(struct p2p_device *dev)
{
	dev->scan_interval = 0;

	if (dev->scan_id)
		scan_cancel(dev->wdev_id, dev->scan_id);

	if (dev->scan_timeout)
		l_timeout_remove(dev->scan_timeout);

	p2p_device_roc_cancel(dev);
	frame_watch_group_remove(dev->wdev_id, FRAME_GROUP_P2P_LISTEN);
}

static void p2p_device_enable_cb(struct l_genl_msg *msg, void *user_data)
{
	struct p2p_device *dev = user_data;
	int error = l_genl_msg_get_error(msg);
	struct l_dbus_message *message = dev->pending_message;

	l_debug("START/STOP_P2P_DEVICE: %s (%i)", strerror(-error), -error);

	if (error)
		goto done;

	dev->enabled = !dev->enabled;

	if (dev->enabled && !l_queue_isempty(dev->discovery_users))
		p2p_device_discovery_start(dev);

done:
	dev->pending_complete(dbus_get_bus(), message,
				error ? dbus_error_failed(message) :
				NULL);
	dev->pending_message = NULL;
	dev->pending_complete = NULL;

	if (!error)
		l_dbus_property_changed(dbus_get_bus(),
					p2p_device_get_path(dev),
					IWD_P2P_INTERFACE, "Enabled");
}

static void p2p_device_enable_destroy(void *user_data)
{
	struct p2p_device *dev = user_data;

	dev->start_stop_cmd_id = 0;
}

static bool p2p_peer_remove_disconnected(void *peer, void *conn_peer)
{
	if (peer == conn_peer)
		return false;

	p2p_peer_put(peer);
	return true;
}

static void p2p_device_start_stop(struct p2p_device *dev,
				l_dbus_property_complete_cb_t complete,
				struct l_dbus_message *message)
{
	struct l_genl_msg *cmd;

	if (dev->enabled)
		p2p_device_discovery_stop(dev);

	if (!dev->enabled)
		cmd = l_genl_msg_new_sized(NL80211_CMD_START_P2P_DEVICE, 16);
	else
		cmd = l_genl_msg_new_sized(NL80211_CMD_STOP_P2P_DEVICE, 16);

	l_genl_msg_append_attr(cmd, NL80211_ATTR_WDEV, 8, &dev->wdev_id);

	dev->start_stop_cmd_id = l_genl_family_send(dev->nl80211, cmd,
						p2p_device_enable_cb, dev,
						p2p_device_enable_destroy);
	if (!dev->start_stop_cmd_id) {
		l_genl_msg_unref(cmd);
		complete(dbus_get_bus(), message, dbus_error_failed(message));
		return;
	}

	dev->pending_message = message;
	dev->pending_complete = complete;

	if (dev->enabled) {
		/*
		 * Stopping the P2P device, drop all peers as we can't start
		 * new connections from now on.  Check if we have a connection
		 * being set up without a .conn_netdev and without
		 * .conn_wsc_bss -- this will mean the connection is still in
		 * the PD or GO Negotiation phase or inside the scan.  Those
		 * phases happen on the device interface so the connection
		 * gets immediately aborted.
		 */
		if (dev->conn_peer && !dev->conn_netdev && !dev->conn_wsc_bss)
			p2p_connect_failed(dev);

		if (!dev->conn_peer) {
			l_queue_destroy(dev->peer_list, p2p_peer_put);
			dev->peer_list = NULL;
		} else
			/*
			 * If the connection already depends on its own
			 * netdev only, we can let it continue until the user
			 * decides to disconnect.
			 */
			l_queue_foreach_remove(dev->peer_list,
						p2p_peer_remove_disconnected,
						dev->conn_peer);
	}
}

static void p2p_mlme_notify(struct l_genl_msg *msg, void *user_data)
{
	struct p2p_device *dev = user_data;
	uint64_t wdev_id;
	uint64_t cookie;

	if (nl80211_parse_attrs(msg, NL80211_ATTR_WDEV, &wdev_id,
				NL80211_ATTR_COOKIE, &cookie,
				NL80211_ATTR_UNSPEC) < 0 ||
			wdev_id != dev->wdev_id)
		return;

	switch (l_genl_msg_get_command(msg)) {
	case NL80211_CMD_REMAIN_ON_CHANNEL:
		if (!dev->have_roc_cookie || cookie != dev->roc_cookie)
			break;

		if (!dev->scan_timeout)
			break;

		/*
		 * The Listen phase is actually starting here, update the
		 * timeout so we know more or less when it ends.
		 */
		l_debug("ROC started");
		l_timeout_modify_ms(dev->scan_timeout, dev->listen_duration);
		break;
	case NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL:
		/* TODO */
		break;
	}
}

#define P2P_SUPPORTED_METHODS	(			\
	WSC_CONFIGURATION_METHOD_LABEL |		\
	WSC_CONFIGURATION_METHOD_KEYPAD |		\
	WSC_CONFIGURATION_METHOD_VIRTUAL_PUSH_BUTTON |	\
	WSC_CONFIGURATION_METHOD_PHYSICAL_PUSH_BUTTON |	\
	WSC_CONFIGURATION_METHOD_P2P |			\
	WSC_CONFIGURATION_METHOD_VIRTUAL_DISPLAY_PIN |	\
	WSC_CONFIGURATION_METHOD_PHYSICAL_DISPLAY_PIN)

struct p2p_device *p2p_device_update_from_genl(struct l_genl_msg *msg,
						bool create)
{
	const uint8_t *ifaddr;
	uint32_t iftype;
	uint64_t wdev_id;
	uint32_t wiphy_id;
	struct wiphy *wiphy;
	struct p2p_device *dev;
	char hostname[HOST_NAME_MAX + 1];
	char *str;
	unsigned int uint_val;

	if (nl80211_parse_attrs(msg, NL80211_ATTR_WDEV, &wdev_id,
				NL80211_ATTR_WIPHY, &wiphy_id,
				NL80211_ATTR_IFTYPE, &iftype,
				NL80211_ATTR_MAC, &ifaddr,
				NL80211_ATTR_UNSPEC) < 0 ||
			L_WARN_ON(!(wiphy = wiphy_find(wiphy_id))) ||
			L_WARN_ON(iftype != NL80211_IFTYPE_P2P_DEVICE)) {
		l_warn("Unable to parse interface information");
		return NULL;
	}

	if (create) {
		if (p2p_device_find(wdev_id)) {
			l_debug("Duplicate p2p device %" PRIx64, wdev_id);
			return NULL;
		}
	} else {
		dev = p2p_device_find(wdev_id);
		if (!dev)
			return NULL;

		memcpy(dev->addr, ifaddr, ETH_ALEN);
		return NULL;
	}

	dev = l_new(struct p2p_device, 1);
	dev->wdev_id = wdev_id;
	memcpy(dev->addr, ifaddr, ETH_ALEN);
	dev->nl80211 = l_genl_family_new(iwd_get_genl(), NL80211_GENL_NAME);
	dev->wiphy = wiphy;
	gethostname(hostname, sizeof(hostname));
	dev->connections_left = 1;

	/*
	 * Section 3.1.4.2: "The Tie breaker bit in a first GO Negotiation
	 * Request frame (for instance after power up) shall be set to 0 or 1
	 * randomly, such that both values occur equally on average."
	 */
	dev->next_tie_breaker = l_getrandom_uint32();

	/* TODO: allow masking capability bits through a setting? */
	dev->capability.device_caps = P2P_DEVICE_CAP_CONCURRENT_OP;
	dev->capability.group_caps = 0;

	memcpy(dev->device_info.device_addr, dev->addr, 6);

	dev->device_info.wsc_config_methods =
		WSC_CONFIGURATION_METHOD_P2P |
		WSC_CONFIGURATION_METHOD_PUSH_BUTTON;
	dev->device_info.primary_device_type.category = 1;	/* Computer */
	memcpy(dev->device_info.primary_device_type.oui, microsoft_oui, 3);
	dev->device_info.primary_device_type.oui_type = 0x04;
	dev->device_info.primary_device_type.subcategory = 1;	/* PC */
	l_strlcpy(dev->device_info.device_name, hostname,
			sizeof(dev->device_info.device_name));

	if (l_settings_get_uint(iwd_get_config(), "P2P",
				"ConfigurationMethods", &uint_val)) {
		if (!(uint_val & P2P_SUPPORTED_METHODS))
			l_error("[P2P].ConfigurationMethods must contain "
				"at least one supported method");
		else if (uint_val & ~0xffff)
			l_error("[P2P].ConfigurationMethods should be a "
				"16-bit integer");
		else
			dev->device_info.wsc_config_methods =
				uint_val & P2P_SUPPORTED_METHODS;
	}

	str = l_settings_get_string(iwd_get_config(), "P2P", "DeviceType");

	if (str && !wsc_device_type_from_setting_str(str,
					&dev->device_info.primary_device_type))
		l_error("[P2P].DeviceType must be a subcategory string "
			"or a 64-bit integer encoding the full Primary"
			" Device Type attribute: "
			"<Category>|<OUI>|<OUI Type>|<Subcategory>");

	l_free(str);

	l_queue_push_tail(p2p_device_list, dev);

	l_debug("Created P2P device %" PRIx64, dev->wdev_id);

	scan_wdev_add(dev->wdev_id);

	if (!l_genl_family_register(dev->nl80211, NL80211_MULTICAST_GROUP_MLME,
					p2p_mlme_notify, dev, NULL))
		l_error("Registering for MLME notifications failed");

	if (!l_dbus_object_add_interface(dbus_get_bus(),
						p2p_device_get_path(dev),
						IWD_P2P_INTERFACE, dev))
		l_info("Unable to add the %s interface to %s",
			IWD_P2P_INTERFACE, p2p_device_get_path(dev));

	return dev;
}

static void p2p_device_free(void *user_data)
{
	struct p2p_device *dev = user_data;

	if (dev->pending_message) {
		struct l_dbus_message *reply =
			dbus_error_aborted(dev->pending_message);

		dev->pending_complete(dbus_get_bus(),
					dev->pending_message, reply);
		dev->pending_message = NULL;
		dev->pending_complete = NULL;
	}

	p2p_device_discovery_stop(dev);
	p2p_connection_reset(dev);
	l_dbus_unregister_object(dbus_get_bus(), p2p_device_get_path(dev));
	l_queue_destroy(dev->peer_list, p2p_peer_put);
	l_queue_destroy(dev->discovery_users, p2p_discovery_user_free);
	l_genl_family_free(dev->nl80211); /* Cancels dev->start_stop_cmd_id */
	scan_wdev_remove(dev->wdev_id);
	l_free(dev);
}

bool p2p_device_destroy(struct p2p_device *dev)
{
	if (!l_queue_remove(p2p_device_list, dev))
		return false;

	p2p_device_free(dev);
	return true;
}

static bool p2p_device_get_enabled(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_device *dev = user_data;
	bool enabled = dev->enabled;

	l_dbus_message_builder_append_basic(builder, 'b', &enabled);

	return true;
}

static struct l_dbus_message *p2p_device_set_enabled(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_iter *new_value,
					l_dbus_property_complete_cb_t complete,
					void *user_data)
{
	struct p2p_device *dev = user_data;
	bool new_enabled;

	if (!l_dbus_message_iter_get_variant(new_value, "b", &new_enabled))
		return dbus_error_invalid_args(message);

	if (dev->start_stop_cmd_id || dev->pending_message)
		return dbus_error_busy(message);

	if (dev->enabled == new_enabled) {
		complete(dbus, message, NULL);
		return NULL;
	}

	p2p_device_start_stop(dev, complete, message);
	return NULL;
}

static bool p2p_device_get_name(struct l_dbus *dbus,
				struct l_dbus_message *message,
				struct l_dbus_message_builder *builder,
				void *user_data)
{
	struct p2p_device *dev = user_data;

	l_dbus_message_builder_append_basic(builder, 's',
						dev->device_info.device_name);
	return true;
}

static struct l_dbus_message *p2p_device_set_name(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_iter *new_value,
					l_dbus_property_complete_cb_t complete,
					void *user_data)
{
	struct p2p_device *dev = user_data;
	const char *new_name;
	bool changed = false;

	if (!l_dbus_message_iter_get_variant(new_value, "s", &new_name))
		return dbus_error_invalid_args(message);

	if (!strcmp(new_name, dev->device_info.device_name))
		goto done;

	if (strlen(new_name) > sizeof(dev->device_info.device_name) - 1)
		return dbus_error_invalid_args(message);

	changed = true;
	l_strlcpy(dev->device_info.device_name, new_name,
			sizeof(dev->device_info.device_name));

done:
	complete(dbus, message, NULL);

	if (changed)
		l_dbus_property_changed(dbus, p2p_device_get_path(dev),
					IWD_P2P_INTERFACE, "Name");

	return NULL;
}

static bool p2p_device_get_avail_conns(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_device *dev = user_data;
	uint16_t avail_conns = dev->connections_left;

	l_dbus_message_builder_append_basic(builder, 'q', &avail_conns);
	return true;
}

static struct l_dbus_message *p2p_device_get_peers(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	struct p2p_device *dev = user_data;
	struct l_dbus_message *reply;
	struct l_dbus_message_builder *builder;
	const struct l_queue_entry *entry;

	if (!l_dbus_message_get_arguments(message, ""))
		return dbus_error_invalid_args(message);

	reply = l_dbus_message_new_method_return(message);
	builder = l_dbus_message_builder_new(reply);

	l_dbus_message_builder_enter_array(builder, "(on)");

	for (entry = l_queue_get_entries(dev->peer_list); entry;
			entry = entry->next) {
		const struct p2p_peer *peer = entry->data;
		int16_t signal_strength = peer->bss->signal_strength;

		l_dbus_message_builder_enter_struct(builder, "on");
		l_dbus_message_builder_append_basic(builder, 'o',
						p2p_peer_get_path(peer));
		l_dbus_message_builder_append_basic(builder, 'n',
							&signal_strength);
		l_dbus_message_builder_leave_struct(builder);
	}

	l_dbus_message_builder_leave_array(builder);

	l_dbus_message_builder_finalize(builder);
	l_dbus_message_builder_destroy(builder);

	return reply;
}

static void p2p_device_discovery_disconnect(struct l_dbus *dbus, void *user_data)
{
	struct p2p_discovery_user *user = user_data;
	struct p2p_device *dev = user->dev;

	l_debug("P2P Device Discovery user %s disconnected", user->client);

	l_queue_remove(dev->discovery_users, user);
	p2p_discovery_user_free(user);

	if (l_queue_isempty(dev->discovery_users))
		p2p_device_discovery_stop(dev);
}

static void p2p_device_discovery_destroy(void *user_data)
{
	struct p2p_discovery_user *user = user_data;

	user->disconnect_watch = 0;
}

static struct l_dbus_message *p2p_device_request_discovery(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	struct p2p_device *dev = user_data;
	struct p2p_discovery_user *user;
	bool first_user = l_queue_isempty(dev->discovery_users);

	if (!l_dbus_message_get_arguments(message, ""))
		return dbus_error_invalid_args(message);

	if (l_queue_find(dev->discovery_users, p2p_discovery_user_match,
				l_dbus_message_get_sender(message)))
		return dbus_error_already_exists(message);

	if (!dev->discovery_users)
		dev->discovery_users = l_queue_new();

	user = l_new(struct p2p_discovery_user, 1);
	user->client = l_strdup(l_dbus_message_get_sender(message));
	user->dev = dev;
	user->disconnect_watch = l_dbus_add_disconnect_watch(dbus,
						user->client,
						p2p_device_discovery_disconnect,
						user,
						p2p_device_discovery_destroy);
	l_queue_push_tail(dev->discovery_users, user);

	if (first_user && !dev->conn_peer && dev->enabled)
		p2p_device_discovery_start(dev);

	return l_dbus_message_new_method_return(message);
}

static struct l_dbus_message *p2p_device_release_discovery(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	struct p2p_device *dev = user_data;
	struct p2p_discovery_user *user;

	if (!l_dbus_message_get_arguments(message, ""))
		return dbus_error_invalid_args(message);

	user = l_queue_remove_if(dev->discovery_users,
				p2p_discovery_user_match,
				l_dbus_message_get_sender(message));
	if (!user)
		return dbus_error_not_found(message);

	p2p_discovery_user_free(user);

	/*
	 * If dev->conn_peer is non-NULL, we may be scanning as a way to
	 * listen for a GO Negotiation Request from the target peer.  In
	 * that case we don't stop the device discovery when the list
	 * becomes empty.
	 */
	if (l_queue_isempty(dev->discovery_users) && !dev->conn_peer)
		p2p_device_discovery_stop(dev);

	return l_dbus_message_new_method_return(message);
}

static void p2p_interface_setup(struct l_dbus_interface *interface)
{
	l_dbus_interface_property(interface, "Enabled", 0, "b",
					p2p_device_get_enabled,
					p2p_device_set_enabled);
	l_dbus_interface_property(interface, "Name", 0, "s",
					p2p_device_get_name,
					p2p_device_set_name);
	l_dbus_interface_property(interface, "AvailableConnections", 0, "q",
					p2p_device_get_avail_conns, NULL);
	l_dbus_interface_method(interface, "GetPeers", 0,
				p2p_device_get_peers, "a(on)", "", "peers");
	l_dbus_interface_method(interface, "RequestDiscovery", 0,
				p2p_device_request_discovery, "", "");
	l_dbus_interface_method(interface, "ReleaseDiscovery", 0,
				p2p_device_release_discovery, "", "");
}

static bool p2p_peer_get_name(struct l_dbus *dbus,
				struct l_dbus_message *message,
				struct l_dbus_message_builder *builder,
				void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 's', peer->name);
	return true;
}

static bool p2p_peer_get_addr(struct l_dbus *dbus,
				struct l_dbus_message *message,
				struct l_dbus_message_builder *builder,
				void *user_data)
{
	struct p2p_peer *peer = user_data;
	const char *addr = util_address_to_string(peer->device_addr);

	l_dbus_message_builder_append_basic(builder, 's', addr);
	return true;
}

static bool p2p_peer_get_device(struct l_dbus *dbus,
				struct l_dbus_message *message,
				struct l_dbus_message_builder *builder,
				void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 'o',
						p2p_device_get_path(peer->dev));
	return true;
}

static bool p2p_peer_get_category(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;
	const char *category;

	if (!wsc_device_type_to_dbus_str(&peer->primary_device_type,
						&category, NULL) ||
			!category)
		category = "unknown-device";

	l_dbus_message_builder_append_basic(builder, 's', category);
	return true;
}

static bool p2p_peer_get_subcategory(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;
	const char *subcategory;

	/*
	 * Should we generate subcategory strings with the numerical
	 * values for the subcategories we don't know, such as
	 * "Vendor-specific 00:11:22:33 44" ?
	 */

	if (!wsc_device_type_to_dbus_str(&peer->primary_device_type,
						NULL, &subcategory) ||
			!subcategory)
		return false;

	l_dbus_message_builder_append_basic(builder, 's', subcategory);
	return true;
}

static bool p2p_peer_get_connected(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;
	bool connected = p2p_peer_operational(peer) &&
		peer->dev->conn_peer == peer;

	l_dbus_message_builder_append_basic(builder, 'b', &connected);
	return true;
}

static bool p2p_peer_get_connected_if(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;
	const char *ifname = netdev_get_name(peer->dev->conn_netdev);

	if (!p2p_peer_operational(peer))
		return false;

	l_dbus_message_builder_append_basic(builder, 's', ifname);
	return true;
}

static bool p2p_peer_get_connected_ip(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	if (!p2p_peer_operational(peer))
		return false;

	l_dbus_message_builder_append_basic(builder, 's', peer->dev->conn_peer_ip);
	return true;
}

static struct l_dbus_message *p2p_peer_dbus_disconnect(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	struct p2p_peer *peer = user_data;

	if (!l_dbus_message_get_arguments(message, ""))
		return dbus_error_invalid_args(message);

	/*
	 * Save the message for both WSC.Cancel and Peer.Disconnect the
	 * same way.
	 */
	peer->wsc.pending_cancel = l_dbus_message_ref(message);

	p2p_peer_disconnect(peer);
	return NULL;
}

static void p2p_peer_interface_setup(struct l_dbus_interface *interface)
{
	l_dbus_interface_property(interface, "Name", 0, "s",
					p2p_peer_get_name, NULL);
	l_dbus_interface_property(interface, "Address", 0, "s",
					p2p_peer_get_addr, NULL);
	l_dbus_interface_property(interface, "Device", 0, "o",
					p2p_peer_get_device, NULL);
	l_dbus_interface_property(interface, "DeviceCategory", 0, "s",
					p2p_peer_get_category, NULL);
	l_dbus_interface_property(interface, "DeviceSubcategory", 0, "s",
					p2p_peer_get_subcategory, NULL);
	l_dbus_interface_property(interface, "Connected", 0, "b",
					p2p_peer_get_connected, NULL);
	l_dbus_interface_property(interface, "ConnectedInterface", 0, "s",
					p2p_peer_get_connected_if, NULL);
	l_dbus_interface_property(interface, "ConnectedIP", 0, "s",
					p2p_peer_get_connected_ip, NULL);
	l_dbus_interface_method(interface, "Disconnect", 0,
				p2p_peer_dbus_disconnect, "", "");
}

static bool p2p_peer_get_wfd_source(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 'b', &peer->wfd->source);
	return true;
}

static bool p2p_peer_get_wfd_sink(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 'b', &peer->wfd->sink);
	return true;
}

static bool p2p_peer_get_wfd_port(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	if (!peer->wfd->source)
		return false;

	l_dbus_message_builder_append_basic(builder, 'q', &peer->wfd->port);
	return true;
}

static bool p2p_peer_get_wfd_has_audio(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	if (!peer->wfd->sink)
		return false;

	l_dbus_message_builder_append_basic(builder, 'b', &peer->wfd->audio);
	return true;
}

static bool p2p_peer_get_wfd_has_uibc(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 'b', &peer->wfd->uibc);
	return true;
}

static bool p2p_peer_get_wfd_has_cp(struct l_dbus *dbus,
					struct l_dbus_message *message,
					struct l_dbus_message_builder *builder,
					void *user_data)
{
	struct p2p_peer *peer = user_data;

	l_dbus_message_builder_append_basic(builder, 'b', &peer->wfd->cp);
	return true;
}

static void p2p_wfd_interface_setup(struct l_dbus_interface *interface)
{
	l_dbus_interface_property(interface, "Source", 0, "b",
					p2p_peer_get_wfd_source, NULL);
	l_dbus_interface_property(interface, "Sink", 0, "b",
					p2p_peer_get_wfd_sink, NULL);
	l_dbus_interface_property(interface, "Port", 0, "q",
					p2p_peer_get_wfd_port, NULL);
	l_dbus_interface_property(interface, "HasAudio", 0, "b",
					p2p_peer_get_wfd_has_audio, NULL);
	l_dbus_interface_property(interface, "HasUIBC", 0, "b",
					p2p_peer_get_wfd_has_uibc, NULL);
	l_dbus_interface_property(interface, "HasContentProtection", 0, "b",
					p2p_peer_get_wfd_has_cp, NULL);
}

static void p2p_own_wfd_free(void)
{
	const struct l_queue_entry *entry;

	l_free(p2p_own_wfd);
	p2p_own_wfd = NULL;

	for (entry = l_queue_get_entries(p2p_device_list); entry;
			entry = entry->next) {
		struct p2p_device *dev = entry->data;

		if (dev->conn_own_wfd)
			p2p_connect_failed(dev);
	}
}

static void p2p_wfd_disconnect_watch_cb(struct l_dbus *dbus, void *user_data)
{
	l_debug("P2P WFD service disconnected");

	if (L_WARN_ON(unlikely(!p2p_own_wfd)))
		return;

	p2p_own_wfd_free();
}

static void p2p_wfd_disconnect_watch_destroy(void *user_data)
{
	p2p_wfd_disconnect_watch = 0;
}

static struct l_dbus_message *p2p_wfd_register(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	const char *prop_name;
	struct l_dbus_message_iter prop_iter;
	struct l_dbus_message_iter prop_variant;
	struct p2p_wfd_properties props = {};
	bool have_source = false;
	bool have_sink = false;
	bool have_port = false;
	bool have_has_audio = false;
	bool have_has_uibc = false;
	bool have_has_cp = false;

	if (!l_dbus_message_get_arguments(message, "a{sv}", &prop_iter))
		return dbus_error_invalid_args(message);

	while (l_dbus_message_iter_next_entry(&prop_iter, &prop_name,
						&prop_variant)) {
		if (!strcmp(prop_name, "Source")) {
			if (have_source)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "b",
								&props.source))
				return dbus_error_invalid_args(message);

			have_source = true;
		} else if (!strcmp(prop_name, "Sink")) {
			if (have_sink)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "b",
								&props.sink))
				return dbus_error_invalid_args(message);

			have_sink = true;
		} else if (!strcmp(prop_name, "Port")) {
			if (have_port)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "q",
								&props.port))
				return dbus_error_invalid_args(message);

			have_port = true;
		} else if (!strcmp(prop_name, "HasAudio")) {
			if (have_has_audio)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "b",
								&props.audio))
				return dbus_error_invalid_args(message);

			have_has_audio = true;
		} else if (!strcmp(prop_name, "HasUIBC")) {
			if (have_has_uibc)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "b",
								&props.uibc))
				return dbus_error_invalid_args(message);

			have_has_uibc = true;
		} else if (!strcmp(prop_name, "HasContentProtection")) {
			if (have_has_cp)
				return dbus_error_invalid_args(message);

			if (!l_dbus_message_iter_get_variant(&prop_variant, "b",
								&props.cp))
				return dbus_error_invalid_args(message);

			have_has_cp = true;
		} else
			return dbus_error_invalid_args(message);
	}

	if ((!have_source || !props.source) && (!have_sink || !props.sink))
		return dbus_error_invalid_args(message);

	if (!have_source)
		props.source = !props.sink;
	else if (!have_sink)
		props.sink = !props.source;

	if (have_port && (!props.source || props.port == 0))
		return dbus_error_invalid_args(message);

	if (props.source && !have_port)
		props.port = 7236;

	if (have_has_audio && !props.sink)
		return dbus_error_invalid_args(message);
	else if (!have_has_audio && props.sink)
		props.audio = true;

	/*
	 * Should this be calculated based on Wi-Fi connection capacity?
	 * Wi-Fi Display Technical Specification v2.1.0 only mentions this
	 * in the context of the video format selection on the source (D.1.1):
	 * "A WFD Source should determine averaged encoded video data rate
	 * not to exceed the value indicated in the WFD Device Maximum
	 * throughput field at WFD Device Information subelement transmitted
	 * by the targeted WFD Sink [...]"
	 */
	props.throughput = 10;

	if (p2p_own_wfd)
		return dbus_error_already_exists(message);

	/* Available for WFD Session by default */
	props.available = true;

	p2p_wfd_disconnect_watch = l_dbus_add_disconnect_watch(dbus,
					l_dbus_message_get_sender(message),
					p2p_wfd_disconnect_watch_cb, NULL,
					p2p_wfd_disconnect_watch_destroy);
	p2p_own_wfd = l_memdup(&props, sizeof(props));
	return l_dbus_message_new_method_return(message);
}

static struct l_dbus_message *p2p_wfd_unregister(struct l_dbus *dbus,
						struct l_dbus_message *message,
						void *user_data)
{
	if (!l_dbus_message_get_arguments(message, ""))
		return dbus_error_invalid_args(message);

	if (!p2p_own_wfd)
		return dbus_error_not_found(message);

	/* TODO: possibly check sender */
	l_dbus_remove_watch(dbus, p2p_wfd_disconnect_watch);
	p2p_own_wfd_free();
	return l_dbus_message_new_method_return(message);
}

static void p2p_service_manager_interface_setup(
					struct l_dbus_interface *interface)
{
	l_dbus_interface_method(interface, "RegisterDisplayService", 0,
				p2p_wfd_register, "", "a{sv}", "properties");
	l_dbus_interface_method(interface, "UnregisterDisplayService", 0,
				p2p_wfd_unregister, "", "");
}

static void p2p_service_manager_destroy_cb(void *user_data)
{
	if (p2p_own_wfd) {
		l_dbus_remove_watch(dbus_get_bus(), p2p_wfd_disconnect_watch);
		p2p_own_wfd_free();
	}
}

static int p2p_init(void)
{
	struct l_dbus *dbus = dbus_get_bus();

	if (!l_dbus_register_interface(dbus, IWD_P2P_INTERFACE,
					p2p_interface_setup,
					NULL, false))
		l_error("Unable to register the %s interface",
			IWD_P2P_INTERFACE);

	if (!l_dbus_register_interface(dbus, IWD_P2P_PEER_INTERFACE,
					p2p_peer_interface_setup,
					NULL, false))
		l_error("Unable to register the %s interface",
			IWD_P2P_PEER_INTERFACE);

	p2p_dhcp_settings = l_settings_new();
	p2p_device_list = l_queue_new();

	if (!l_dbus_register_interface(dbus, IWD_P2P_WFD_INTERFACE,
					p2p_wfd_interface_setup,
					NULL, false))
		l_error("Unable to register the %s interface",
			IWD_P2P_WFD_INTERFACE);

	if (!l_dbus_register_interface(dbus, IWD_P2P_SERVICE_MANAGER_INTERFACE,
					p2p_service_manager_interface_setup,
					p2p_service_manager_destroy_cb, false))
		l_error("Unable to register the %s interface",
			IWD_P2P_SERVICE_MANAGER_INTERFACE);
	else if (!l_dbus_object_add_interface(dbus,
					IWD_P2P_SERVICE_MANAGER_PATH,
					IWD_P2P_SERVICE_MANAGER_INTERFACE,
					NULL))
		l_error("Unable to register the P2P Service Manager object");

	if (!l_settings_get_uint(iwd_get_config(), "P2P", "DHCPTimeout",
					&p2p_dhcp_timeout_val))
		p2p_dhcp_timeout_val = 20;	/* 20s default */

	return 0;
}

static void p2p_exit(void)
{
	struct l_dbus *dbus = dbus_get_bus();

	l_dbus_unregister_interface(dbus, IWD_P2P_INTERFACE);
	l_dbus_unregister_interface(dbus, IWD_P2P_PEER_INTERFACE);
	l_dbus_unregister_interface(dbus, IWD_P2P_WFD_INTERFACE);
	l_dbus_unregister_interface(dbus, IWD_P2P_SERVICE_MANAGER_INTERFACE);
	l_queue_destroy(p2p_device_list, p2p_device_free);
	p2p_device_list = NULL;
	l_settings_free(p2p_dhcp_settings);
	p2p_dhcp_settings = NULL;
}

IWD_MODULE(p2p, p2p_init, p2p_exit)
IWD_MODULE_DEPENDS(p2p, wiphy)
IWD_MODULE_DEPENDS(p2p, scan)
IWD_MODULE_DEPENDS(p2p, netconfig)