text: /*
   * Wi-Fi Direct - P2P Group Owner Negotiation
   * Copyright (c) 2009-2010, Atheros Communications
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "includes.h"
  
  #include "common.h"
  #include "common/ieee802_11_defs.h"
  #include "wps/wps_defs.h"
  #include "p2p_i.h"
  #include "p2p.h"
  
  
  static int p2p_go_det(u8 own_intent, u8 peer_value)
  {
  	u8 peer_intent = peer_value >> 1;
  	if (own_intent == peer_intent) {
  		if (own_intent == P2P_MAX_GO_INTENT)
  			return -1; /* both devices want to become GO */
  
  		/* Use tie breaker bit to determine GO */
  		return (peer_value & 0x01) ? 0 : 1;
  	}
  
  	return own_intent > peer_intent;
  }
  
  
  int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own,
  			    struct p2p_device *dev,
  			    const u8 *channel_list, size_t channel_list_len)
  {
  	const u8 *pos, *end;
  	struct p2p_channels *ch;
  	size_t channels;
  	struct p2p_channels intersection;
  
  	ch = &dev->channels;
  	os_memset(ch, 0, sizeof(*ch));
  	pos = channel_list;
  	end = channel_list + channel_list_len;
  
  	if (end - pos < 3)
  		return -1;
  	os_memcpy(dev->country, pos, 3);
  	wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3);
  	if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  			"P2P: Mismatching country (ours=%c%c peer's=%c%c)",
  			p2p->cfg->country[0], p2p->cfg->country[1],
  			pos[0], pos[1]);
  		return -1;
  	}
  	pos += 3;
  
  	while (pos + 2 < end) {
  		struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes];
  		cl->reg_class = *pos++;
  		if (pos + 1 + pos[0] > end) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  				"P2P: Invalid peer Channel List");
  			return -1;
  		}
  		channels = *pos++;
  		cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ?
  			P2P_MAX_REG_CLASS_CHANNELS : channels;
  		os_memcpy(cl->channel, pos, cl->channels);
  		pos += channels;
  		ch->reg_classes++;
  		if (ch->reg_classes == P2P_MAX_REG_CLASSES)
  			break;
  	}
  
  	p2p_channels_intersect(own, &dev->channels, &intersection);
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d "
  		"peer reg_classes %d intersection reg_classes %d",
  		(int) own->reg_classes,
  		(int) dev->channels.reg_classes,
  		(int) intersection.reg_classes);
  	if (intersection.reg_classes == 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
  			"P2P: No common channels found");
  		return -1;
  	}
  	return 0;
  }
  
  
  static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev,
  			     const u8 *channel_list, size_t channel_list_len)
  {
  	return p2p_peer_channels_check(p2p, &p2p->channels, dev,
  				       channel_list, channel_list_len);
  }
  
  
  u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method)
  {
  	switch (wps_method) {
  	case WPS_PIN_DISPLAY:
  		return DEV_PW_REGISTRAR_SPECIFIED;
  	case WPS_PIN_KEYPAD:
  		return DEV_PW_USER_SPECIFIED;
  	case WPS_PBC:
  		return DEV_PW_PUSHBUTTON;
  	default:
  		return DEV_PW_DEFAULT;
  	}
  }
  
  
  static const char * p2p_wps_method_str(enum p2p_wps_method wps_method)
  {
  	switch (wps_method) {
  	case WPS_PIN_DISPLAY:
  		return "Display";
  	case WPS_PIN_KEYPAD:
  		return "Keypad";
  	case WPS_PBC:
  		return "PBC";
  	default:
  		return "??";
  	}
  }
  
  
  static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p,
  					    struct p2p_device *peer)
  {
  	struct wpabuf *buf;
  	u8 *len;
  	u8 group_capab;
  	size_t extra = 0;
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		extra = wpabuf_len(p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  	buf = wpabuf_alloc(1000 + extra);
  	if (buf == NULL)
  		return NULL;
  
  	peer->dialog_token++;
  	if (peer->dialog_token == 0)
  		peer->dialog_token = 1;
  	p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token);
  
  	len = p2p_buf_add_ie_hdr(buf);
  	group_capab = 0;
  	if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
  		group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
  		if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
  			group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN;
  	}
  	if (p2p->cross_connect)
  		group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
  	if (p2p->cfg->p2p_intra_bss)
  		group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
  	p2p_buf_add_capability(buf, p2p->dev_capab &
  			       ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
  			       group_capab);
  	p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) |
  			      p2p->next_tie_breaker);
  	p2p->next_tie_breaker = !p2p->next_tie_breaker;
  	p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout);
  	p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class,
  				   p2p->cfg->channel);
  	if (p2p->ext_listen_interval)
  		p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period,
  					      p2p->ext_listen_interval);
  	p2p_buf_add_intended_addr(buf, p2p->intended_addr);
  	p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
  	p2p_buf_add_device_info(buf, p2p, peer);
  	p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  				      p2p->op_reg_class, p2p->op_channel);
  	p2p_buf_update_ie_hdr(buf, len);
  
  	/* WPS IE with Device Password ID attribute */
  	p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0);
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  	return buf;
  }
  
  
  int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev)
  {
  	struct wpabuf *req;
  	int freq;
  
  	if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) {
  		u16 config_method;
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Use PD-before-GO-Neg workaround for " MACSTR,
  			MAC2STR(dev->info.p2p_device_addr));
  		if (dev->wps_method == WPS_PIN_DISPLAY)
  			config_method = WPS_CONFIG_KEYPAD;
  		else if (dev->wps_method == WPS_PIN_KEYPAD)
  			config_method = WPS_CONFIG_DISPLAY;
  		else if (dev->wps_method == WPS_PBC)
  			config_method = WPS_CONFIG_PUSHBUTTON;
  		else
  			return -1;
  		return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr,
  					 config_method, 0, 0);
  	}
  
  	freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
  	if (freq <= 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Listen/Operating frequency known for the "
  			"peer " MACSTR " to send GO Negotiation Request",
  			MAC2STR(dev->info.p2p_device_addr));
  		return -1;
  	}
  
  	req = p2p_build_go_neg_req(p2p, dev);
  	if (req == NULL)
  		return -1;
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Sending GO Negotiation Request");
  	p2p_set_state(p2p, P2P_CONNECT);
  	p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST;
  	p2p->go_neg_peer = dev;
  	dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE;
  	dev->connect_reqs++;
  	if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr,
  			    p2p->cfg->dev_addr, dev->info.p2p_device_addr,
  			    wpabuf_head(req), wpabuf_len(req), 200) < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Failed to send Action frame");
  		/* Use P2P find to recover and retry */
  		p2p_set_timeout(p2p, 0, 0);
  	} else
  		dev->go_neg_req_sent++;
  
  	wpabuf_free(req);
  
  	return 0;
  }
  
  
  static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p,
  					     struct p2p_device *peer,
  					     u8 dialog_token, u8 status,
  					     u8 tie_breaker)
  {
  	struct wpabuf *buf;
  	u8 *len;
  	u8 group_capab;
  	size_t extra = 0;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Building GO Negotiation Response");
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		extra = wpabuf_len(p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  	buf = wpabuf_alloc(1000 + extra);
  	if (buf == NULL)
  		return NULL;
  
  	p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token);
  
  	len = p2p_buf_add_ie_hdr(buf);
  	p2p_buf_add_status(buf, status);
  	group_capab = 0;
  	if (peer && peer->go_state == LOCAL_GO) {
  		if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
  			group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
  			if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
  				group_capab |=
  					P2P_GROUP_CAPAB_PERSISTENT_RECONN;
  		}
  		if (p2p->cross_connect)
  			group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
  		if (p2p->cfg->p2p_intra_bss)
  			group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
  	}
  	p2p_buf_add_capability(buf, p2p->dev_capab &
  			       ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
  			       group_capab);
  	p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker);
  	p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout);
  	if (peer && peer->go_state == REMOTE_GO) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating "
  			"Channel attribute");
  	} else {
  		p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  					      p2p->op_reg_class,
  					      p2p->op_channel);
  	}
  	p2p_buf_add_intended_addr(buf, p2p->intended_addr);
  	if (status || peer == NULL) {
  		p2p_buf_add_channel_list(buf, p2p->cfg->country,
  					 &p2p->channels);
  	} else if (peer->go_state == REMOTE_GO) {
  		p2p_buf_add_channel_list(buf, p2p->cfg->country,
  					 &p2p->channels);
  	} else {
  		struct p2p_channels res;
  		p2p_channels_intersect(&p2p->channels, &peer->channels,
  				       &res);
  		p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
  	}
  	p2p_buf_add_device_info(buf, p2p, peer);
  	if (peer && peer->go_state == LOCAL_GO) {
  		p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
  				     p2p->ssid_len);
  	}
  	p2p_buf_update_ie_hdr(buf, len);
  
  	/* WPS IE with Device Password ID attribute */
  	p2p_build_wps_ie(p2p, buf,
  			 p2p_wps_method_pw_id(peer ? peer->wps_method :
  					      WPS_NOT_READY), 0);
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  
  	return buf;
  }
  
  
  static void p2p_reselect_channel(struct p2p_data *p2p,
  				 struct p2p_channels *intersection)
  {
  	struct p2p_reg_class *cl;
  	int freq;
  	u8 op_reg_class, op_channel;
  	unsigned int i;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating "
  		"channel (reg_class %u channel %u) not acceptable to the "
  		"peer", p2p->op_reg_class, p2p->op_channel);
  
  	/* First, try to pick the best channel from another band */
  	freq = p2p_channel_to_freq(p2p->cfg->country, p2p->op_reg_class,
  				   p2p->op_channel);
  	if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 &&
  	    p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_5,
  				&op_reg_class, &op_channel) == 0 &&
  	    p2p_channels_includes(intersection, op_reg_class, op_channel)) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 5 GHz "
  			"channel (reg_class %u channel %u) from intersection",
  			op_reg_class, op_channel);
  		p2p->op_reg_class = op_reg_class;
  		p2p->op_channel = op_channel;
  		return;
  	}
  
  	if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 &&
  	    p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_24,
  				&op_reg_class, &op_channel) == 0 &&
  	    p2p_channels_includes(intersection, op_reg_class, op_channel)) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 2.4 GHz "
  			"channel (reg_class %u channel %u) from intersection",
  			op_reg_class, op_channel);
  		p2p->op_reg_class = op_reg_class;
  		p2p->op_channel = op_channel;
  		return;
  	}
  
  	/* Select channel with highest preference if the peer supports it */
  	for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) {
  		if (p2p_channels_includes(intersection,
  					  p2p->cfg->pref_chan[i].op_class,
  					  p2p->cfg->pref_chan[i].chan)) {
  			p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class;
  			p2p->op_channel = p2p->cfg->pref_chan[i].chan;
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick "
  				"highest preferred chnnel (op_class %u "
  				"channel %u) from intersection",
  				p2p->op_reg_class, p2p->op_channel);
  			return;
  		}
  	}
  
  	/* Try a channel where we might be able to use HT40 */
  	for (i = 0; i < intersection->reg_classes; i++) {
  		struct p2p_reg_class *c = &intersection->reg_class[i];
  		if (c->reg_class == 116 || c->reg_class == 117 ||
  		    c->reg_class == 126 || c->reg_class == 127) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Pick possible HT40 channel (reg_class "
  				"%u channel %u) from intersection",
  				c->reg_class, c->channel[0]);
  			p2p->op_reg_class = c->reg_class;
  			p2p->op_channel = c->channel[0];
  			return;
  		}
  	}
  
  	/*
  	 * Try to see if the original channel is in the intersection. If
  	 * so, no need to change anything, as it already contains some
  	 * randomness.
  	 */
  	if (p2p_channels_includes(intersection, p2p->op_reg_class,
  				  p2p->op_channel)) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Using original operating class and channel "
  			"(reg_class %u channel %u) from intersection",
  			p2p->op_reg_class, p2p->op_channel);
  		return;
  	}
  
  	/*
  	 * Fall back to whatever is included in the channel intersection since
  	 * no better options seems to be available.
  	 */
  	cl = &intersection->reg_class[0];
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick another channel "
  		"(reg_class %u channel %u) from intersection",
  		cl->reg_class, cl->channel[0]);
  	p2p->op_reg_class = cl->reg_class;
  	p2p->op_channel = cl->channel[0];
  }
  
  
  void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa,
  			    const u8 *data, size_t len, int rx_freq)
  {
  	struct p2p_device *dev = NULL;
  	struct wpabuf *resp;
  	struct p2p_message msg;
  	u8 status = P2P_SC_FAIL_INVALID_PARAMS;
  	int tie_breaker = 0;
  	int freq;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Received GO Negotiation Request from " MACSTR
  		"(freq=%d)", MAC2STR(sa), rx_freq);
  
  	if (p2p_parse(data, len, &msg))
  		return;
  
  	if (!msg.capability) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Capability attribute missing from GO "
  			"Negotiation Request");
  #ifdef CONFIG_P2P_STRICT
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (msg.go_intent)
  		tie_breaker = *msg.go_intent & 0x01;
  	else {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory GO Intent attribute missing from GO "
  			"Negotiation Request");
  #ifdef CONFIG_P2P_STRICT
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.config_timeout) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Configuration Timeout attribute "
  			"missing from GO Negotiation Request");
  #ifdef CONFIG_P2P_STRICT
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.listen_channel) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Listen Channel attribute received");
  		goto fail;
  	}
  	if (!msg.operating_channel) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Operating Channel attribute received");
  		goto fail;
  	}
  	if (!msg.channel_list) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Channel List attribute received");
  		goto fail;
  	}
  	if (!msg.intended_addr) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Intended P2P Interface Address attribute "
  			"received");
  		goto fail;
  	}
  	if (!msg.p2p_device_info) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No P2P Device Info attribute received");
  		goto fail;
  	}
  
  	if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unexpected GO Negotiation Request SA=" MACSTR
  			" != dev_addr=" MACSTR,
  			MAC2STR(sa), MAC2STR(msg.p2p_device_addr));
  		goto fail;
  	}
  
  	dev = p2p_get_device(p2p, sa);
  
  	if (msg.status && *msg.status) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unexpected Status attribute (%d) in GO "
  			"Negotiation Request", *msg.status);
  		goto fail;
  	}
  
  	if (dev == NULL)
  		dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg);
  	else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY)
  		p2p_add_dev_info(p2p, sa, dev, &msg);
  	if (dev && dev->flags & P2P_DEV_USER_REJECTED) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: User has rejected this peer");
  		status = P2P_SC_FAIL_REJECTED_BY_USER;
  	} else if (dev == NULL || dev->wps_method == WPS_NOT_READY) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Not ready for GO negotiation with " MACSTR,
  			MAC2STR(sa));
  		status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
  		if (dev)
  			dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE;
  		p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa,
  					msg.dev_password_id);
  	} else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Already in Group Formation with another peer");
  		status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
  	} else {
  		int go;
  
  		if (!p2p->go_neg_peer) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting "
  				"GO Negotiation with previously authorized "
  				"peer");
  			if (!(dev->flags & P2P_DEV_FORCE_FREQ)) {
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: Use default channel settings");
  				p2p->op_reg_class = p2p->cfg->op_reg_class;
  				p2p->op_channel = p2p->cfg->op_channel;
  				os_memcpy(&p2p->channels, &p2p->cfg->channels,
  					  sizeof(struct p2p_channels));
  			} else {
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: Use previously configured "
  					"forced channel settings");
  			}
  		}
  
  		dev->flags &= ~P2P_DEV_NOT_YET_READY;
  
  		if (!msg.go_intent) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: No GO Intent attribute received");
  			goto fail;
  		}
  		if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Invalid GO Intent value (%u) received",
  				*msg.go_intent >> 1);
  			goto fail;
  		}
  
  		if (dev->go_neg_req_sent &&
  		    os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Do not reply since peer has higher "
  				"address and GO Neg Request already sent");
  			p2p_parse_free(&msg);
  			return;
  		}
  
  		if (dev->dialog_token == msg.dialog_token) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Do not reply since dialog token %d "
  				"was already used", msg.dialog_token);
  			p2p_parse_free(&msg);
  			return;
  		}
  
  		go = p2p_go_det(p2p->go_intent, *msg.go_intent);
  		if (go < 0) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Incompatible GO Intent");
  			status = P2P_SC_FAIL_BOTH_GO_INTENT_15;
  			goto fail;
  		}
  
  		if (p2p_peer_channels(p2p, dev, msg.channel_list,
  				      msg.channel_list_len) < 0) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: No common channels found");
  			status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
  			goto fail;
  		}
  
  		switch (msg.dev_password_id) {
  		case DEV_PW_REGISTRAR_SPECIFIED:
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: PIN from peer Display");
  			if (dev->wps_method != WPS_PIN_KEYPAD) {
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: We have wps_method=%s -> "
  					"incompatible",
  					p2p_wps_method_str(dev->wps_method));
  				status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  				goto fail;
  			}
  			break;
  		case DEV_PW_USER_SPECIFIED:
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Peer entered PIN on Keypad");
  			if (dev->wps_method != WPS_PIN_DISPLAY) {
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: We have wps_method=%s -> "
  					"incompatible",
  					p2p_wps_method_str(dev->wps_method));
  				status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  				goto fail;
  			}
  			break;
  		case DEV_PW_PUSHBUTTON:
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Peer using pushbutton");
  			if (dev->wps_method != WPS_PBC) {
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: We have wps_method=%s -> "
  					"incompatible",
  					p2p_wps_method_str(dev->wps_method));
  				status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  				goto fail;
  			}
  			break;
  		default:
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Unsupported Device Password ID %d",
  				msg.dev_password_id);
  			status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  			goto fail;
  		}
  
  		if (go) {
  			struct p2p_channels intersection;
  			size_t i;
  			p2p_channels_intersect(&p2p->channels, &dev->channels,
  					       &intersection);
  			if (intersection.reg_classes == 0 ||
  			    intersection.reg_class[0].channels == 0) {
  				status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
  				wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  					"P2P: No common channels found");
  				goto fail;
  			}
  			for (i = 0; i < intersection.reg_classes; i++) {
  				struct p2p_reg_class *c;
  				c = &intersection.reg_class[i];
  				wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
  					   c->reg_class);
  				wpa_hexdump(MSG_DEBUG, "P2P: channels",
  					    c->channel, c->channels);
  			}
  			if (!p2p->cfg->cfg_op_channel ||
  			    !p2p_channels_includes(&intersection,
  						   p2p->op_reg_class,
  						   p2p->op_channel))
  				p2p_reselect_channel(p2p, &intersection);
  
  			if (!p2p->ssid_set) {
  				p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
  				p2p->ssid_set = 1;
  			}
  		}
  
  		dev->go_state = go ? LOCAL_GO : REMOTE_GO;
  		dev->oper_freq = p2p_channel_to_freq((const char *)
  						     msg.operating_channel,
  						     msg.operating_channel[3],
  						     msg.operating_channel[4]);
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
  			"channel preference: %d MHz", dev->oper_freq);
  
  		if (msg.config_timeout) {
  			dev->go_timeout = msg.config_timeout[0];
  			dev->client_timeout = msg.config_timeout[1];
  		}
  
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
  		if (p2p->state != P2P_IDLE)
  			p2p_stop_find_for_freq(p2p, rx_freq);
  		p2p_set_state(p2p, P2P_GO_NEG);
  		p2p_clear_timeout(p2p);
  		dev->dialog_token = msg.dialog_token;
  		os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
  		p2p->go_neg_peer = dev;
  		status = P2P_SC_SUCCESS;
  	}
  
  fail:
  	if (dev)
  		dev->status = status;
  	resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status,
  				     !tie_breaker);
  	p2p_parse_free(&msg);
  	if (resp == NULL)
  		return;
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Sending GO Negotiation Response");
  	if (rx_freq > 0)
  		freq = rx_freq;
  	else
  		freq = p2p_channel_to_freq(p2p->cfg->country,
  					   p2p->cfg->reg_class,
  					   p2p->cfg->channel);
  	if (freq < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unknown regulatory class/channel");
  		wpabuf_free(resp);
  		return;
  	}
  	if (status == P2P_SC_SUCCESS) {
  		p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE;
  		dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM;
  		if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) {
  			/*
  			 * Peer has smaller address, so the GO Negotiation
  			 * Response from us is expected to complete
  			 * negotiation. Ignore a GO Negotiation Response from
  			 * the peer if it happens to be received after this
  			 * point due to a race condition in GO Negotiation
  			 * Request transmission and processing.
  			 */
  			dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
  		}
  	} else
  		p2p->pending_action_state =
  			P2P_PENDING_GO_NEG_RESPONSE_FAILURE;
  	if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
  			    p2p->cfg->dev_addr,
  			    wpabuf_head(resp), wpabuf_len(resp), 250) < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Failed to send Action frame");
  	}
  
  	wpabuf_free(resp);
  }
  
  
  static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p,
  					     struct p2p_device *peer,
  					     u8 dialog_token, u8 status,
  					     const u8 *resp_chan, int go)
  {
  	struct wpabuf *buf;
  	u8 *len;
  	struct p2p_channels res;
  	u8 group_capab;
  	size_t extra = 0;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Building GO Negotiation Confirm");
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		extra = wpabuf_len(p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  	buf = wpabuf_alloc(1000 + extra);
  	if (buf == NULL)
  		return NULL;
  
  	p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token);
  
  	len = p2p_buf_add_ie_hdr(buf);
  	p2p_buf_add_status(buf, status);
  	group_capab = 0;
  	if (peer->go_state == LOCAL_GO) {
  		if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) {
  			group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
  			if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN)
  				group_capab |=
  					P2P_GROUP_CAPAB_PERSISTENT_RECONN;
  		}
  		if (p2p->cross_connect)
  			group_capab |= P2P_GROUP_CAPAB_CROSS_CONN;
  		if (p2p->cfg->p2p_intra_bss)
  			group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST;
  	}
  	p2p_buf_add_capability(buf, p2p->dev_capab &
  			       ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY,
  			       group_capab);
  	if (go || resp_chan == NULL)
  		p2p_buf_add_operating_channel(buf, p2p->cfg->country,
  					      p2p->op_reg_class,
  					      p2p->op_channel);
  	else
  		p2p_buf_add_operating_channel(buf, (const char *) resp_chan,
  					      resp_chan[3], resp_chan[4]);
  	p2p_channels_intersect(&p2p->channels, &peer->channels, &res);
  	p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
  	if (go) {
  		p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
  				     p2p->ssid_len);
  	}
  	p2p_buf_update_ie_hdr(buf, len);
  
  #ifdef CONFIG_WIFI_DISPLAY
  	if (p2p->wfd_ie_go_neg)
  		wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
  #endif /* CONFIG_WIFI_DISPLAY */
  
  	return buf;
  }
  
  
  void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa,
  			     const u8 *data, size_t len, int rx_freq)
  {
  	struct p2p_device *dev;
  	struct wpabuf *conf;
  	int go = -1;
  	struct p2p_message msg;
  	u8 status = P2P_SC_SUCCESS;
  	int freq;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Received GO Negotiation Response from " MACSTR
  		" (freq=%d)", MAC2STR(sa), rx_freq);
  	dev = p2p_get_device(p2p, sa);
  	if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
  	    dev != p2p->go_neg_peer) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Not ready for GO negotiation with " MACSTR,
  			MAC2STR(sa));
  		return;
  	}
  
  	if (p2p_parse(data, len, &msg))
  		return;
  
  	if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Was not expecting GO Negotiation Response - "
  			"ignore");
  		p2p_parse_free(&msg);
  		return;
  	}
  	dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
  	p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
  
  	if (msg.dialog_token != dev->dialog_token) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unexpected Dialog Token %u (expected %u)",
  			msg.dialog_token, dev->dialog_token);
  		p2p_parse_free(&msg);
  		return;
  	}
  
  	if (!msg.status) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Status attribute received");
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  	if (*msg.status) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: GO Negotiation rejected: status %d",
  			*msg.status);
  		dev->go_neg_req_sent = 0;
  		if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Wait for the peer to become ready for "
  				"GO Negotiation");
  			dev->flags |= P2P_DEV_NOT_YET_READY;
  			dev->wait_count = 0;
  			p2p_set_state(p2p, P2P_WAIT_PEER_IDLE);
  			p2p_set_timeout(p2p, 0, 0);
  		} else {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: Stop GO Negotiation attempt");
  			p2p_go_neg_failed(p2p, dev, *msg.status);
  		}
  		p2p_parse_free(&msg);
  		return;
  	}
  
  	if (!msg.capability) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Capability attribute missing from GO "
  			"Negotiation Response");
  #ifdef CONFIG_P2P_STRICT
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.p2p_device_info) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory P2P Device Info attribute missing "
  			"from GO Negotiation Response");
  #ifdef CONFIG_P2P_STRICT
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.intended_addr) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Intended P2P Interface Address attribute "
  			"received");
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  
  	if (!msg.go_intent) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No GO Intent attribute received");
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  	if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Invalid GO Intent value (%u) received",
  			*msg.go_intent >> 1);
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  
  	go = p2p_go_det(p2p->go_intent, *msg.go_intent);
  	if (go < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Incompatible GO Intent");
  		status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
  		goto fail;
  	}
  
  	if (!go && msg.group_id) {
  		/* Store SSID for Provisioning step */
  		p2p->ssid_len = msg.group_id_len - ETH_ALEN;
  		os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len);
  	} else if (!go) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory P2P Group ID attribute missing from "
  			"GO Negotiation Response");
  		p2p->ssid_len = 0;
  #ifdef CONFIG_P2P_STRICT
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.config_timeout) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Configuration Timeout attribute "
  			"missing from GO Negotiation Response");
  #ifdef CONFIG_P2P_STRICT
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  #endif /* CONFIG_P2P_STRICT */
  	} else {
  		dev->go_timeout = msg.config_timeout[0];
  		dev->client_timeout = msg.config_timeout[1];
  	}
  
  	if (!msg.operating_channel && !go) {
  		/*
  		 * Note: P2P Client may omit Operating Channel attribute to
  		 * indicate it does not have a preference.
  		 */
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Operating Channel attribute received");
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  	if (!msg.channel_list) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Channel List attribute received");
  		status = P2P_SC_FAIL_INVALID_PARAMS;
  		goto fail;
  	}
  
  	if (p2p_peer_channels(p2p, dev, msg.channel_list,
  			      msg.channel_list_len) < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No common channels found");
  		status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
  		goto fail;
  	}
  
  	if (msg.operating_channel) {
  		dev->oper_freq = p2p_channel_to_freq((const char *)
  						     msg.operating_channel,
  						     msg.operating_channel[3],
  						     msg.operating_channel[4]);
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
  			"channel preference: %d MHz", dev->oper_freq);
  	} else
  		dev->oper_freq = 0;
  
  	switch (msg.dev_password_id) {
  	case DEV_PW_REGISTRAR_SPECIFIED:
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: PIN from peer Display");
  		if (dev->wps_method != WPS_PIN_KEYPAD) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: We have wps_method=%s -> "
  				"incompatible",
  				p2p_wps_method_str(dev->wps_method));
  			status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  			goto fail;
  		}
  		break;
  	case DEV_PW_USER_SPECIFIED:
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Peer entered PIN on Keypad");
  		if (dev->wps_method != WPS_PIN_DISPLAY) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: We have wps_method=%s -> "
  				"incompatible",
  				p2p_wps_method_str(dev->wps_method));
  			status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  			goto fail;
  		}
  		break;
  	case DEV_PW_PUSHBUTTON:
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Peer using pushbutton");
  		if (dev->wps_method != WPS_PBC) {
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: We have wps_method=%s -> "
  				"incompatible",
  				p2p_wps_method_str(dev->wps_method));
  			status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  			goto fail;
  		}
  		break;
  	default:
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unsupported Device Password ID %d",
  			msg.dev_password_id);
  		status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
  		goto fail;
  	}
  
  	if (go) {
  		struct p2p_channels intersection;
  		size_t i;
  		p2p_channels_intersect(&p2p->channels, &dev->channels,
  				       &intersection);
  		if (intersection.reg_classes == 0 ||
  		    intersection.reg_class[0].channels == 0) {
  			status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
  			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  				"P2P: No common channels found");
  			goto fail;
  		}
  		for (i = 0; i < intersection.reg_classes; i++) {
  			struct p2p_reg_class *c;
  			c = &intersection.reg_class[i];
  			wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
  				   c->reg_class);
  			wpa_hexdump(MSG_DEBUG, "P2P: channels",
  				    c->channel, c->channels);
  		}
  		if (!p2p->cfg->cfg_op_channel ||
  		    !p2p_channels_includes(&intersection, p2p->op_reg_class,
  					   p2p->op_channel))
  			p2p_reselect_channel(p2p, &intersection);
  
  		if (!p2p->ssid_set) {
  			p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
  			p2p->ssid_set = 1;
  		}
  	}
  
  	p2p_set_state(p2p, P2P_GO_NEG);
  	p2p_clear_timeout(p2p);
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
  	os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
  
  fail:
  	conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status,
  				     msg.operating_channel, go);
  	p2p_parse_free(&msg);
  	if (conf == NULL)
  		return;
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Sending GO Negotiation Confirm");
  	if (status == P2P_SC_SUCCESS) {
  		p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM;
  		dev->go_state = go ? LOCAL_GO : REMOTE_GO;
  	} else
  		p2p->pending_action_state = P2P_NO_PENDING_ACTION;
  	if (rx_freq > 0)
  		freq = rx_freq;
  	else
  		freq = dev->listen_freq;
  	if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa,
  			    wpabuf_head(conf), wpabuf_len(conf), 0) < 0) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Failed to send Action frame");
  		p2p_go_neg_failed(p2p, dev, -1);
  	}
  	wpabuf_free(conf);
  }
  
  
  void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa,
  			     const u8 *data, size_t len)
  {
  	struct p2p_device *dev;
  	struct p2p_message msg;
  
  	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  		"P2P: Received GO Negotiation Confirm from " MACSTR,
  		MAC2STR(sa));
  	p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
  	dev = p2p_get_device(p2p, sa);
  	if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
  	    dev != p2p->go_neg_peer) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Not ready for GO negotiation with " MACSTR,
  			MAC2STR(sa));
  		return;
  	}
  
  	if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Stopped waiting "
  			"for TX status on GO Negotiation Response since we "
  			"already received Confirmation");
  		p2p->pending_action_state = P2P_NO_PENDING_ACTION;
  	}
  
  	if (p2p_parse(data, len, &msg))
  		return;
  
  	if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Was not expecting GO Negotiation Confirm - "
  			"ignore");
  		return;
  	}
  	dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM;
  
  	if (msg.dialog_token != dev->dialog_token) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unexpected Dialog Token %u (expected %u)",
  			msg.dialog_token, dev->dialog_token);
  		p2p_parse_free(&msg);
  		return;
  	}
  
  	if (!msg.status) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: No Status attribute received");
  		p2p_parse_free(&msg);
  		return;
  	}
  	if (*msg.status) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: GO Negotiation rejected: status %d",
  			*msg.status);
  		p2p_parse_free(&msg);
  		return;
  	}
  
  	if (dev->go_state == REMOTE_GO && msg.group_id) {
  		/* Store SSID for Provisioning step */
  		p2p->ssid_len = msg.group_id_len - ETH_ALEN;
  		os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len);
  	} else if (dev->go_state == REMOTE_GO) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory P2P Group ID attribute missing from "
  			"GO Negotiation Confirmation");
  		p2p->ssid_len = 0;
  #ifdef CONFIG_P2P_STRICT
  		p2p_parse_free(&msg);
  		return;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.operating_channel) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Operating Channel attribute missing "
  			"from GO Negotiation Confirmation");
  #ifdef CONFIG_P2P_STRICT
  		p2p_parse_free(&msg);
  		return;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	if (!msg.channel_list) {
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Mandatory Operating Channel attribute missing "
  			"from GO Negotiation Confirmation");
  #ifdef CONFIG_P2P_STRICT
  		p2p_parse_free(&msg);
  		return;
  #endif /* CONFIG_P2P_STRICT */
  	}
  
  	p2p_parse_free(&msg);
  
  	if (dev->go_state == UNKNOWN_GO) {
  		/*
  		 * This should not happen since GO negotiation has already
  		 * been completed.
  		 */
  		wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
  			"P2P: Unexpected GO Neg state - do not know which end "
  			"becomes GO");
  		return;
  	}
  
  	p2p_go_complete(p2p, dev);
  }
  