Example #1
0
void p2p_process_prov_disc_req(struct p2p_data *p2p, const u8 *sa,
			       const u8 *data, size_t len, int rx_freq)
{
	struct p2p_message msg;
	struct p2p_device *dev;
	int freq;
	enum p2p_status_code reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
	struct wpabuf *resp;
	u32 adv_id = 0;
	struct p2ps_advertisement *p2ps_adv = NULL;
	u8 conncap = P2PS_SETUP_NEW;
	u8 auto_accept = 0;
	u32 session_id = 0;
	u8 session_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
	u8 adv_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
	const u8 *group_mac;
	int passwd_id = DEV_PW_DEFAULT;
	u16 config_methods;
	u16 allowed_config_methods = WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
	struct p2ps_feature_capab resp_fcap = { 0, 0 };
	struct p2ps_feature_capab *req_fcap = NULL;
	u8 remote_conncap;
	u16 method;

	if (p2p_parse(data, len, &msg))
		return;

	p2p_dbg(p2p, "Received Provision Discovery Request from " MACSTR
		" with config methods 0x%x (freq=%d)",
		MAC2STR(sa), msg.wps_config_methods, rx_freq);
	group_mac = msg.intended_addr;

	dev = p2p_get_device(p2p, sa);
	if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
		p2p_dbg(p2p, "Provision Discovery Request from unknown peer "
			MACSTR, MAC2STR(sa));

		if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
				   0)) {
			p2p_dbg(p2p, "Provision Discovery Request add device failed "
				MACSTR, MAC2STR(sa));
			goto out;
		}

		if (!dev) {
			dev = p2p_get_device(p2p, sa);
			if (!dev) {
				p2p_dbg(p2p,
					"Provision Discovery device not found "
					MACSTR, MAC2STR(sa));
				goto out;
			}
		}
	} else if (msg.wfd_subelems) {
		wpabuf_free(dev->info.wfd_subelems);
		dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems);
	}

	if (!msg.adv_id) {
		allowed_config_methods |= WPS_CONFIG_PUSHBUTTON;
		if (!(msg.wps_config_methods & allowed_config_methods)) {
			p2p_dbg(p2p,
				"Unsupported Config Methods in Provision Discovery Request");
			goto out;
		}

		/* Legacy (non-P2PS) - Unknown groups allowed for P2PS */
		if (msg.group_id) {
			size_t i;

			for (i = 0; i < p2p->num_groups; i++) {
				if (p2p_group_is_group_id_match(
					    p2p->groups[i],
					    msg.group_id, msg.group_id_len))
					break;
			}
			if (i == p2p->num_groups) {
				p2p_dbg(p2p,
					"PD request for unknown P2P Group ID - reject");
				goto out;
			}
		}
	} else {
		allowed_config_methods |= WPS_CONFIG_P2PS;

		/*
		 * Set adv_id here, so in case of an error, a P2PS PD Response
		 * will be sent.
		 */
		adv_id = WPA_GET_LE32(msg.adv_id);
		if (p2ps_validate_pd_req(p2p, &msg, sa) < 0) {
			reject = P2P_SC_FAIL_INVALID_PARAMS;
			goto out;
		}

		req_fcap = (struct p2ps_feature_capab *) msg.feature_cap;

		os_memcpy(session_mac, msg.session_mac, ETH_ALEN);
		os_memcpy(adv_mac, msg.adv_mac, ETH_ALEN);

		session_id = WPA_GET_LE32(msg.session_id);

		if (msg.conn_cap)
			conncap = *msg.conn_cap;

		/*
		 * We need to verify a P2PS config methog in an initial PD
		 * request or in a follow-on PD request with the status
		 * SUCCESS_DEFERRED.
		 */
		if ((!msg.status || *msg.status == P2P_SC_SUCCESS_DEFERRED) &&
		    !(msg.wps_config_methods & allowed_config_methods)) {
			p2p_dbg(p2p,
				"Unsupported Config Methods in Provision Discovery Request");
			goto out;
		}

		/*
		 * TODO: since we don't support multiple PD, reject PD request
		 * if we are in the middle of P2PS PD with some other peer
		 */
	}

	dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY |
			P2P_DEV_PD_PEER_KEYPAD |
			P2P_DEV_PD_PEER_P2PS);

	if (msg.wps_config_methods & WPS_CONFIG_DISPLAY) {
		p2p_dbg(p2p, "Peer " MACSTR
			" requested us to show a PIN on display", MAC2STR(sa));
		dev->flags |= P2P_DEV_PD_PEER_KEYPAD;
		passwd_id = DEV_PW_USER_SPECIFIED;
	} else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
		p2p_dbg(p2p, "Peer " MACSTR
			" requested us to write its PIN using keypad",
			MAC2STR(sa));
		dev->flags |= P2P_DEV_PD_PEER_DISPLAY;
		passwd_id = DEV_PW_REGISTRAR_SPECIFIED;
	} else if (msg.wps_config_methods & WPS_CONFIG_P2PS) {
		p2p_dbg(p2p, "Peer " MACSTR " requesting P2PS PIN",
			MAC2STR(sa));
		dev->flags |= P2P_DEV_PD_PEER_P2PS;
		passwd_id = DEV_PW_P2PS_DEFAULT;
	}

	/* Remove stale persistent groups */
	if (p2p->cfg->remove_stale_groups) {
		p2p->cfg->remove_stale_groups(
			p2p->cfg->cb_ctx, dev->info.p2p_device_addr,
			msg.persistent_dev,
			msg.persistent_ssid, msg.persistent_ssid_len);
	}

	reject = P2P_SC_SUCCESS;

	/*
	 * End of a legacy P2P PD Request processing, from this point continue
	 * with P2PS one.
	 */
	if (!msg.adv_id)
		goto out;

	remote_conncap = conncap;

	if (!msg.status) {
		unsigned int forced_freq, pref_freq;

		if (os_memcmp(p2p->cfg->dev_addr, msg.adv_mac, ETH_ALEN)) {
			p2p_dbg(p2p,
				"P2PS PD adv mac does not match the local one");
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			goto out;
		}

		p2ps_adv = p2p_service_p2ps_id(p2p, adv_id);
		if (!p2ps_adv) {
			p2p_dbg(p2p, "P2PS PD invalid adv_id=0x%X", adv_id);
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			goto out;
		}
		p2p_dbg(p2p, "adv_id: 0x%X, p2ps_adv: %p", adv_id, p2ps_adv);

		auto_accept = p2ps_adv->auto_accept;
		conncap = p2p->cfg->p2ps_group_capability(p2p->cfg->cb_ctx,
							  conncap, auto_accept,
							  &forced_freq,
							  &pref_freq);

		p2p_dbg(p2p, "Conncap: local:%d remote:%d result:%d",
			auto_accept, remote_conncap, conncap);

		p2p_prepare_channel(p2p, dev, forced_freq, pref_freq, 0);

		resp_fcap.cpt = p2ps_own_preferred_cpt(p2ps_adv->cpt_priority,
						       req_fcap->cpt);

		p2p_dbg(p2p, "cpt: service:0x%x remote:0x%x result:0x%x",
			p2ps_adv->cpt_mask, req_fcap->cpt, resp_fcap.cpt);

		if (!resp_fcap.cpt) {
			p2p_dbg(p2p,
				"Incompatible P2PS feature capability CPT bitmask");
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
		} else if (p2ps_adv->config_methods &&
			   !(msg.wps_config_methods &
			     p2ps_adv->config_methods)) {
			p2p_dbg(p2p,
				"Unsupported config methods in Provision Discovery Request (own=0x%x peer=0x%x)",
				p2ps_adv->config_methods,
				msg.wps_config_methods);
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
		} else if (!p2ps_adv->state) {
			p2p_dbg(p2p, "P2PS state unavailable");
			reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
		} else if (!conncap) {
			p2p_dbg(p2p, "Conncap resolution failed");
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
		}

		if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
			p2p_dbg(p2p, "Keypad - always defer");
			auto_accept = 0;
		}

		if ((remote_conncap & (P2PS_SETUP_NEW | P2PS_SETUP_CLIENT) ||
		     msg.persistent_dev) && conncap != P2PS_SETUP_NEW &&
		    msg.channel_list && msg.channel_list_len &&
		    p2p_peer_channels_check(p2p, &p2p->channels, dev,
					    msg.channel_list,
					    msg.channel_list_len) < 0) {
			p2p_dbg(p2p,
				"No common channels - force deferred flow");
			auto_accept = 0;
		}

		if (((remote_conncap & P2PS_SETUP_GROUP_OWNER) ||
		     msg.persistent_dev) && msg.operating_channel) {
			struct p2p_channels intersect;

			/*
			 * There are cases where only the operating channel is
			 * provided. This requires saving the channel as the
			 * supported channel list, and verifying that it is
			 * supported.
			 */
			if (dev->channels.reg_classes == 0 ||
			    !p2p_channels_includes(&dev->channels,
						   msg.operating_channel[3],
						   msg.operating_channel[4])) {
				struct p2p_channels *ch = &dev->channels;

				os_memset(ch, 0, sizeof(*ch));
				ch->reg_class[0].reg_class =
					msg.operating_channel[3];
				ch->reg_class[0].channel[0] =
					msg.operating_channel[4];
				ch->reg_class[0].channels = 1;
				ch->reg_classes = 1;
			}

			p2p_channels_intersect(&p2p->channels, &dev->channels,
					       &intersect);

			if (intersect.reg_classes == 0) {
				p2p_dbg(p2p,
					"No common channels - force deferred flow");
				auto_accept = 0;
			}
		}

		if (auto_accept || reject != P2P_SC_SUCCESS) {
			struct p2ps_provision *tmp;

			if (p2ps_setup_p2ps_prov(p2p, adv_id, session_id,
						 msg.wps_config_methods,
						 session_mac, adv_mac) < 0) {
				reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
				goto out;
			}

			tmp = p2p->p2ps_prov;
			tmp->force_freq = forced_freq;
			tmp->pref_freq = pref_freq;
			if (conncap) {
				tmp->conncap = conncap;
				tmp->status = P2P_SC_SUCCESS;
			} else {
				tmp->conncap = auto_accept;
				tmp->status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			}

			if (reject != P2P_SC_SUCCESS)
				goto out;
		}
	}

	if (!msg.status && !auto_accept &&
	    (!p2p->p2ps_prov || p2p->p2ps_prov->adv_id != adv_id)) {
		struct p2ps_provision *tmp;

		if (!conncap) {
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			goto out;
		}

		if (p2ps_setup_p2ps_prov(p2p, adv_id, session_id,
					 msg.wps_config_methods,
					 session_mac, adv_mac) < 0) {
			reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
			goto out;
		}
		tmp = p2p->p2ps_prov;
		reject = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
		tmp->status = reject;
	}

	/* Not a P2PS Follow-on PD */
	if (!msg.status)
		goto out;

	if (*msg.status && *msg.status != P2P_SC_SUCCESS_DEFERRED) {
		reject = *msg.status;
		goto out;
	}

	if (*msg.status != P2P_SC_SUCCESS_DEFERRED || !p2p->p2ps_prov)
		goto out;

	if (p2p->p2ps_prov->adv_id != adv_id ||
	    os_memcmp(p2p->p2ps_prov->adv_mac, msg.adv_mac, ETH_ALEN)) {
		p2p_dbg(p2p,
			"P2PS Follow-on PD with mismatch Advertisement ID/MAC");
		goto out;
	}

	if (p2p->p2ps_prov->session_id != session_id ||
	    os_memcmp(p2p->p2ps_prov->session_mac, msg.session_mac, ETH_ALEN)) {
		p2p_dbg(p2p, "P2PS Follow-on PD with mismatch Session ID/MAC");
		goto out;
	}

	method = p2p->p2ps_prov->method;

	conncap = p2p->cfg->p2ps_group_capability(p2p->cfg->cb_ctx,
						  remote_conncap,
						  p2p->p2ps_prov->conncap,
						  &p2p->p2ps_prov->force_freq,
						  &p2p->p2ps_prov->pref_freq);

	resp_fcap.cpt = p2ps_own_preferred_cpt(p2p->p2ps_prov->cpt_priority,
					       req_fcap->cpt);

	p2p_dbg(p2p, "cpt: local:0x%x remote:0x%x result:0x%x",
		p2p->p2ps_prov->cpt_mask, req_fcap->cpt, resp_fcap.cpt);

	p2p_prepare_channel(p2p, dev, p2p->p2ps_prov->force_freq,
			    p2p->p2ps_prov->pref_freq, 0);

	/*
	 * Ensure that if we asked for PIN originally, our method is consistent
	 * with original request.
	 */
	if (method & WPS_CONFIG_DISPLAY)
		method = WPS_CONFIG_KEYPAD;
	else if (method & WPS_CONFIG_KEYPAD)
		method = WPS_CONFIG_DISPLAY;

	if (!conncap || !(msg.wps_config_methods & method)) {
		/*
		 * Reject this "Deferred Accept*
		 * if incompatible conncap or method
		 */
		reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
	} else if (!resp_fcap.cpt) {
		p2p_dbg(p2p,
			"Incompatible P2PS feature capability CPT bitmask");
		reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
	} else if ((remote_conncap & (P2PS_SETUP_NEW | P2PS_SETUP_CLIENT) ||
		    msg.persistent_dev) && conncap != P2PS_SETUP_NEW &&
		   msg.channel_list && msg.channel_list_len &&
		   p2p_peer_channels_check(p2p, &p2p->channels, dev,
					   msg.channel_list,
					   msg.channel_list_len) < 0) {
		p2p_dbg(p2p,
			"No common channels in Follow-On Provision Discovery Request");
		reject = P2P_SC_FAIL_NO_COMMON_CHANNELS;
	} else {
		reject = P2P_SC_SUCCESS;
	}

	dev->oper_freq = 0;
	if (reject == P2P_SC_SUCCESS || reject == P2P_SC_SUCCESS_DEFERRED) {
		u8 tmp;

		if (msg.operating_channel)
			dev->oper_freq =
				p2p_channel_to_freq(msg.operating_channel[3],
						    msg.operating_channel[4]);

		if ((conncap & P2PS_SETUP_GROUP_OWNER) &&
		    p2p_go_select_channel(p2p, dev, &tmp) < 0)
			reject = P2P_SC_FAIL_NO_COMMON_CHANNELS;
	}

	p2p->p2ps_prov->status = reject;
	p2p->p2ps_prov->conncap = conncap;

out:
	if (reject == P2P_SC_SUCCESS ||
	    reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE)
		config_methods = msg.wps_config_methods;
	else
		config_methods = 0;

	/*
	 * Send PD Response for an initial PD Request or for follow-on
	 * PD Request with P2P_SC_SUCCESS_DEFERRED status.
	 */
	if (!msg.status || *msg.status == P2P_SC_SUCCESS_DEFERRED) {
		resp = p2p_build_prov_disc_resp(p2p, dev, msg.dialog_token,
						reject, config_methods, adv_id,
						msg.group_id, msg.group_id_len,
						msg.persistent_ssid,
						msg.persistent_ssid_len,
						(const u8 *) &resp_fcap,
						sizeof(resp_fcap));
		if (!resp) {
			p2p_parse_free(&msg);
			return;
		}
		p2p_dbg(p2p, "Sending Provision Discovery Response");
		if (rx_freq > 0)
			freq = rx_freq;
		else
			freq = p2p_channel_to_freq(p2p->cfg->reg_class,
						   p2p->cfg->channel);
		if (freq < 0) {
			p2p_dbg(p2p, "Unknown regulatory class/channel");
			wpabuf_free(resp);
			p2p_parse_free(&msg);
			return;
		}
		p2p->pending_action_state = P2P_PENDING_PD_RESPONSE;
		if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
				    p2p->cfg->dev_addr,
				    wpabuf_head(resp), wpabuf_len(resp),
				    200) < 0)
			p2p_dbg(p2p, "Failed to send Action frame");
		else
			p2p->send_action_in_progress = 1;

		wpabuf_free(resp);
	}

	if (!dev) {
		p2p_parse_free(&msg);
		return;
	}

	freq = 0;
	if (reject == P2P_SC_SUCCESS && conncap == P2PS_SETUP_GROUP_OWNER) {
		freq = p2p_channel_to_freq(p2p->op_reg_class,
					   p2p->op_channel);
		if (freq < 0)
			freq = 0;
	}

	if (!p2p->cfg->p2ps_prov_complete) {
		/* Don't emit anything */
	} else if (msg.status && *msg.status != P2P_SC_SUCCESS &&
		   *msg.status != P2P_SC_SUCCESS_DEFERRED) {
		reject = *msg.status;
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
					     sa, adv_mac, session_mac,
					     NULL, adv_id, session_id,
					     0, 0, msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL, NULL, 0, freq);
	} else if (msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
		   p2p->p2ps_prov) {
		p2p->p2ps_prov->status = reject;
		p2p->p2ps_prov->conncap = conncap;

		if (reject != P2P_SC_SUCCESS)
			p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
						     sa, adv_mac, session_mac,
						     NULL, adv_id,
						     session_id, conncap, 0,
						     msg.persistent_ssid,
						     msg.persistent_ssid_len, 0,
						     0, NULL, NULL, 0, freq);
		else
			p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx,
						     *msg.status,
						     sa, adv_mac, session_mac,
						     group_mac, adv_id,
						     session_id, conncap,
						     passwd_id,
						     msg.persistent_ssid,
						     msg.persistent_ssid_len, 0,
						     0, NULL,
						     (const u8 *) &resp_fcap,
						     sizeof(resp_fcap), freq);
	} else if (msg.status && p2p->p2ps_prov) {
		p2p->p2ps_prov->status = P2P_SC_SUCCESS;
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, *msg.status, sa,
					     adv_mac, session_mac, group_mac,
					     adv_id, session_id, conncap,
					     passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap), freq);
	} else if (msg.status) {
	} else if (auto_accept && reject == P2P_SC_SUCCESS) {
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
					     sa, adv_mac, session_mac,
					     group_mac, adv_id, session_id,
					     conncap, passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap), freq);
	} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
		   (!msg.session_info || !msg.session_info_len)) {
		p2p->p2ps_prov->method = msg.wps_config_methods;

		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
					     sa, adv_mac, session_mac,
					     group_mac, adv_id, session_id,
					     conncap, passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 1, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap), freq);
	} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
		size_t buf_len = msg.session_info_len;
		char *buf = os_malloc(2 * buf_len + 1);

		if (buf) {
			p2p->p2ps_prov->method = msg.wps_config_methods;

			utf8_escape((char *) msg.session_info, buf_len,
				    buf, 2 * buf_len + 1);

			p2p->cfg->p2ps_prov_complete(
				p2p->cfg->cb_ctx, P2P_SC_SUCCESS, sa,
				adv_mac, session_mac, group_mac, adv_id,
				session_id, conncap, passwd_id,
				msg.persistent_ssid, msg.persistent_ssid_len,
				0, 1, buf,
				(const u8 *) &resp_fcap, sizeof(resp_fcap),
				freq);

			os_free(buf);
		}
	}

	/*
	 * prov_disc_req callback is used to generate P2P-PROV-DISC-ENTER-PIN,
	 * P2P-PROV-DISC-SHOW-PIN, and P2P-PROV-DISC-PBC-REQ events.
	 * Call it either on legacy P2P PD or on P2PS PD only if we need to
	 * enter/show PIN.
	 *
	 * The callback is called in the following cases:
	 * 1. Legacy P2P PD request, response status SUCCESS
	 * 2. P2PS advertiser, method: DISPLAY, autoaccept: TRUE,
	 *    response status: SUCCESS
	 * 3. P2PS advertiser, method  DISPLAY, autoaccept: FALSE,
	 *    response status: INFO_CURRENTLY_UNAVAILABLE
	 * 4. P2PS advertiser, method: KEYPAD, autoaccept==any,
	 *    response status: INFO_CURRENTLY_UNAVAILABLE
	 * 5. P2PS follow-on with SUCCESS_DEFERRED,
	 *    advertiser role: DISPLAY, autoaccept: FALSE,
	 *    seeker: KEYPAD, response status: SUCCESS
	 */
	if (p2p->cfg->prov_disc_req &&
	    ((reject == P2P_SC_SUCCESS && !msg.adv_id) ||
	     (!msg.status &&
	     (reject == P2P_SC_SUCCESS ||
	      reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) &&
	      passwd_id == DEV_PW_USER_SPECIFIED) ||
	     (!msg.status &&
	      reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
	      passwd_id == DEV_PW_REGISTRAR_SPECIFIED) ||
	     (reject == P2P_SC_SUCCESS &&
	      msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
	       passwd_id == DEV_PW_REGISTRAR_SPECIFIED))) {
		const u8 *dev_addr = sa;

		if (msg.p2p_device_addr)
			dev_addr = msg.p2p_device_addr;
		p2p->cfg->prov_disc_req(p2p->cfg->cb_ctx, sa,
					msg.wps_config_methods,
					dev_addr, msg.pri_dev_type,
					msg.device_name, msg.config_methods,
					msg.capability ? msg.capability[0] : 0,
					msg.capability ? msg.capability[1] :
					0,
					msg.group_id, msg.group_id_len);
	}

	if (reject == P2P_SC_SUCCESS) {
		switch (config_methods) {
		case WPS_CONFIG_DISPLAY:
			dev->wps_prov_info = WPS_CONFIG_KEYPAD;
			break;
		case WPS_CONFIG_KEYPAD:
			dev->wps_prov_info = WPS_CONFIG_DISPLAY;
			break;
		case WPS_CONFIG_PUSHBUTTON:
			dev->wps_prov_info = WPS_CONFIG_PUSHBUTTON;
			break;
		case WPS_CONFIG_P2PS:
			dev->wps_prov_info = WPS_CONFIG_P2PS;
			break;
		default:
			dev->wps_prov_info = 0;
			break;
		}

		if (msg.intended_addr)
			os_memcpy(dev->interface_addr, msg.intended_addr,
				  ETH_ALEN);
	}
	p2p_parse_free(&msg);
}
Example #2
0
void p2p_process_prov_disc_req(struct p2p_data *p2p, const u8 *sa,
			       const u8 *data, size_t len, int rx_freq)
{
	struct p2p_message msg;
	struct p2p_device *dev;
	int freq;
	enum p2p_status_code reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
	struct wpabuf *resp;
	u32 adv_id = 0;
	struct p2ps_advertisement *p2ps_adv = NULL;
	u8 conncap = P2PS_SETUP_NEW;
	u8 auto_accept = 0;
	u32 session_id = 0;
	u8 session_mac[ETH_ALEN];
	u8 adv_mac[ETH_ALEN];
	const u8 *group_mac;
	int passwd_id = DEV_PW_DEFAULT;
	u16 config_methods;
	u16 allowed_config_methods = WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
	struct p2ps_feature_capab resp_fcap = { 0, 0 };
	struct p2ps_feature_capab *req_fcap;

	if (p2p_parse(data, len, &msg))
		return;

	p2p_dbg(p2p, "Received Provision Discovery Request from " MACSTR
		" with config methods 0x%x (freq=%d)",
		MAC2STR(sa), msg.wps_config_methods, rx_freq);
	group_mac = msg.intended_addr;

	dev = p2p_get_device(p2p, sa);
	if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
		p2p_dbg(p2p, "Provision Discovery Request from unknown peer "
			MACSTR, MAC2STR(sa));

		if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
				   0)) {
			p2p_dbg(p2p, "Provision Discovery Request add device failed "
				MACSTR, MAC2STR(sa));
		}
	} else if (msg.wfd_subelems) {
		wpabuf_free(dev->info.wfd_subelems);
		dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems);
	}

	if (msg.adv_id)
		allowed_config_methods |= WPS_CONFIG_P2PS;
	else
		allowed_config_methods |= WPS_CONFIG_PUSHBUTTON;

	if (!(msg.wps_config_methods & allowed_config_methods)) {
		p2p_dbg(p2p, "Unsupported Config Methods in Provision Discovery Request");
		goto out;
	}

	/* Legacy (non-P2PS) - Unknown groups allowed for P2PS */
	if (!msg.adv_id && msg.group_id) {
		size_t i;
		for (i = 0; i < p2p->num_groups; i++) {
			if (p2p_group_is_group_id_match(p2p->groups[i],
							msg.group_id,
							msg.group_id_len))
				break;
		}
		if (i == p2p->num_groups) {
			p2p_dbg(p2p, "PD request for unknown P2P Group ID - reject");
			goto out;
		}
	}

	if (dev) {
		dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY |
				P2P_DEV_PD_PEER_KEYPAD |
				P2P_DEV_PD_PEER_P2PS);

		/* Remove stale persistent groups */
		if (p2p->cfg->remove_stale_groups) {
			p2p->cfg->remove_stale_groups(
				p2p->cfg->cb_ctx, dev->info.p2p_device_addr,
				msg.persistent_dev,
				msg.persistent_ssid, msg.persistent_ssid_len);
		}
	}
	if (msg.wps_config_methods & WPS_CONFIG_DISPLAY) {
		p2p_dbg(p2p, "Peer " MACSTR
			" requested us to show a PIN on display", MAC2STR(sa));
		if (dev)
			dev->flags |= P2P_DEV_PD_PEER_KEYPAD;
		passwd_id = DEV_PW_USER_SPECIFIED;
	} else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
		p2p_dbg(p2p, "Peer " MACSTR
			" requested us to write its PIN using keypad",
			MAC2STR(sa));
		if (dev)
			dev->flags |= P2P_DEV_PD_PEER_DISPLAY;
		passwd_id = DEV_PW_REGISTRAR_SPECIFIED;
	} else if (msg.wps_config_methods & WPS_CONFIG_P2PS) {
		p2p_dbg(p2p, "Peer " MACSTR " requesting P2PS PIN",
			MAC2STR(sa));
		if (dev)
			dev->flags |= P2P_DEV_PD_PEER_P2PS;
		passwd_id = DEV_PW_P2PS_DEFAULT;
	}

	reject = P2P_SC_SUCCESS;

	os_memset(session_mac, 0, ETH_ALEN);
	os_memset(adv_mac, 0, ETH_ALEN);

	/* Note 1: A feature capability attribute structure can be changed
	 * in the future. The assumption is that such modifications are
	 * backwards compatible, therefore we allow processing of
	 * msg.feature_cap exceeding the size of the p2ps_feature_capab
	 * structure.
	 * Note 2: Vverification of msg.feature_cap_len below has to be changed
	 * to allow 2 byte feature capability processing if struct
	 * p2ps_feature_capab is extended to include additional fields and it
	 * affects the structure size.
	 */
	if (msg.adv_id && msg.session_id && msg.session_mac && msg.adv_mac &&
	    msg.feature_cap && msg.feature_cap_len >= sizeof(*req_fcap) &&
	    (msg.status || msg.conn_cap)) {
		u8 remote_conncap;

		req_fcap = (struct p2ps_feature_capab *) msg.feature_cap;

		os_memcpy(session_mac, msg.session_mac, ETH_ALEN);
		os_memcpy(adv_mac, msg.adv_mac, ETH_ALEN);

		session_id = WPA_GET_LE32(msg.session_id);
		adv_id = WPA_GET_LE32(msg.adv_id);

		if (!msg.status)
			p2ps_adv = p2p_service_p2ps_id(p2p, adv_id);

		p2p_dbg(p2p, "adv_id: %x - p2ps_adv - %p", adv_id, p2ps_adv);

		if (msg.conn_cap)
			conncap = *msg.conn_cap;
		remote_conncap = conncap;

		if (p2ps_adv) {
			auto_accept = p2ps_adv->auto_accept;
			conncap = p2p->cfg->p2ps_group_capability(
				p2p->cfg->cb_ctx, conncap, auto_accept);

			p2p_dbg(p2p, "Conncap: local:%d remote:%d result:%d",
				auto_accept, remote_conncap, conncap);

			resp_fcap.cpt =
				p2ps_own_preferred_cpt(p2ps_adv->cpt_priority,
						       req_fcap->cpt);

			p2p_dbg(p2p,
				"cpt: service:0x%x remote:0x%x result:0x%x",
				p2ps_adv->cpt_mask, req_fcap->cpt,
				resp_fcap.cpt);

			if (!resp_fcap.cpt) {
				p2p_dbg(p2p,
					"Incompatible P2PS feature capability CPT bitmask");
				reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			} else if (p2ps_adv->config_methods &&
				   !(msg.wps_config_methods &
				   p2ps_adv->config_methods)) {
				p2p_dbg(p2p,
					"Unsupported config methods in Provision Discovery Request (own=0x%x peer=0x%x)",
					p2ps_adv->config_methods,
					msg.wps_config_methods);
				reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			} else if (!p2ps_adv->state) {
				p2p_dbg(p2p, "P2PS state unavailable");
				reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
			} else if (!conncap) {
				p2p_dbg(p2p, "Conncap resolution failed");
				reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			}

			if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
				p2p_dbg(p2p, "Keypad - always defer");
				auto_accept = 0;
			}

			if (auto_accept || reject != P2P_SC_SUCCESS) {
				struct p2ps_provision *tmp;

				if (reject == P2P_SC_SUCCESS && !conncap) {
					reject =
						P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
				}

				if (p2ps_setup_p2ps_prov(
					    p2p, adv_id, session_id,
					    msg.wps_config_methods,
					    session_mac, adv_mac) < 0) {
					reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
					goto out;
				}

				tmp = p2p->p2ps_prov;
				if (conncap) {
					tmp->conncap = conncap;
					tmp->status = P2P_SC_SUCCESS;
				} else {
					tmp->conncap = auto_accept;
					tmp->status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
				}

				if (reject != P2P_SC_SUCCESS)
					goto out;
			}
		} else if (!msg.status) {
			reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
			goto out;
		}

		if (!msg.status && !auto_accept &&
		    (!p2p->p2ps_prov || p2p->p2ps_prov->adv_id != adv_id)) {
			struct p2ps_provision *tmp;

			if (!conncap) {
				reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
				goto out;
			}

			if (p2ps_setup_p2ps_prov(p2p, adv_id, session_id,
						 msg.wps_config_methods,
						 session_mac, adv_mac) < 0) {
				reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
				goto out;
			}
			tmp = p2p->p2ps_prov;
			reject = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
			tmp->status = reject;
		}

		if (msg.status) {
			if (*msg.status &&
			    *msg.status != P2P_SC_SUCCESS_DEFERRED) {
				reject = *msg.status;
			} else if (*msg.status == P2P_SC_SUCCESS_DEFERRED &&
				   p2p->p2ps_prov) {
				u16 method = p2p->p2ps_prov->method;

				conncap = p2p->cfg->p2ps_group_capability(
					p2p->cfg->cb_ctx, remote_conncap,
					p2p->p2ps_prov->conncap);

				p2p_dbg(p2p,
					"Conncap: local:%d remote:%d result:%d",
					p2p->p2ps_prov->conncap,
					remote_conncap, conncap);

				resp_fcap.cpt = p2ps_own_preferred_cpt(
					p2p->p2ps_prov->cpt_priority,
					req_fcap->cpt);

				p2p_dbg(p2p,
					"cpt: local:0x%x remote:0x%x result:0x%x",
					p2p->p2ps_prov->cpt_mask,
					req_fcap->cpt, resp_fcap.cpt);

				/*
				 * Ensure that if we asked for PIN originally,
				 * our method is consistent with original
				 * request.
				 */
				if (method & WPS_CONFIG_DISPLAY)
					method = WPS_CONFIG_KEYPAD;
				else if (method & WPS_CONFIG_KEYPAD)
					method = WPS_CONFIG_DISPLAY;

				if (!conncap ||
				    !(msg.wps_config_methods & method)) {
					/*
					 * Reject this "Deferred Accept*
					 * if incompatible conncap or method
					 */
					reject =
						P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
				} else if (!resp_fcap.cpt) {
					p2p_dbg(p2p,
						"Incompatible P2PS feature capability CPT bitmask");
					reject =
						P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
				} else {
					reject = P2P_SC_SUCCESS;
				}

				p2p->p2ps_prov->status = reject;
				p2p->p2ps_prov->conncap = conncap;
			}
		}
	}

out:
	if (reject == P2P_SC_SUCCESS ||
	    reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE)
		config_methods = msg.wps_config_methods;
	else
		config_methods = 0;
	resp = p2p_build_prov_disc_resp(p2p, dev, msg.dialog_token, reject,
					config_methods, adv_id,
					msg.group_id, msg.group_id_len,
					msg.persistent_ssid,
					msg.persistent_ssid_len,
					(const u8 *) &resp_fcap,
					sizeof(resp_fcap));
	if (resp == NULL) {
		p2p_parse_free(&msg);
		return;
	}
	p2p_dbg(p2p, "Sending Provision Discovery Response");
	if (rx_freq > 0)
		freq = rx_freq;
	else
		freq = p2p_channel_to_freq(p2p->cfg->reg_class,
					   p2p->cfg->channel);
	if (freq < 0) {
		p2p_dbg(p2p, "Unknown regulatory class/channel");
		wpabuf_free(resp);
		p2p_parse_free(&msg);
		return;
	}
	p2p->pending_action_state = P2P_PENDING_PD_RESPONSE;
	if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
			    p2p->cfg->dev_addr,
			    wpabuf_head(resp), wpabuf_len(resp), 200) < 0) {
		p2p_dbg(p2p, "Failed to send Action frame");
	} else
		p2p->send_action_in_progress = 1;

	wpabuf_free(resp);

	if (!p2p->cfg->p2ps_prov_complete) {
		/* Don't emit anything */
	} else if (msg.status && *msg.status != P2P_SC_SUCCESS &&
		   *msg.status != P2P_SC_SUCCESS_DEFERRED) {
		reject = *msg.status;
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
					     sa, adv_mac, session_mac,
					     NULL, adv_id, session_id,
					     0, 0, msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL, NULL, 0);
	} else if (msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
		   p2p->p2ps_prov) {
		p2p->p2ps_prov->status = reject;
		p2p->p2ps_prov->conncap = conncap;

		if (reject != P2P_SC_SUCCESS)
			p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
						     sa, adv_mac, session_mac,
						     NULL, adv_id,
						     session_id, conncap, 0,
						     msg.persistent_ssid,
						     msg.persistent_ssid_len, 0,
						     0, NULL, NULL, 0);
		else
			p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx,
						     *msg.status,
						     sa, adv_mac, session_mac,
						     group_mac, adv_id,
						     session_id, conncap,
						     passwd_id,
						     msg.persistent_ssid,
						     msg.persistent_ssid_len, 0,
						     0, NULL,
						     (const u8 *) &resp_fcap,
						     sizeof(resp_fcap));
	} else if (msg.status && p2p->p2ps_prov) {
		p2p->p2ps_prov->status = P2P_SC_SUCCESS;
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, *msg.status, sa,
					     adv_mac, session_mac, group_mac,
					     adv_id, session_id, conncap,
					     passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap));
	} else if (msg.status) {
	} else if (auto_accept && reject == P2P_SC_SUCCESS) {
		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
					     sa, adv_mac, session_mac,
					     group_mac, adv_id, session_id,
					     conncap, passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 0, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap));
	} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
		   (!msg.session_info || !msg.session_info_len)) {
		p2p->p2ps_prov->method = msg.wps_config_methods;

		p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
					     sa, adv_mac, session_mac,
					     group_mac, adv_id, session_id,
					     conncap, passwd_id,
					     msg.persistent_ssid,
					     msg.persistent_ssid_len,
					     0, 1, NULL,
					     (const u8 *) &resp_fcap,
					     sizeof(resp_fcap));
	} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
		size_t buf_len = msg.session_info_len;
		char *buf = os_malloc(2 * buf_len + 1);

		if (buf) {
			p2p->p2ps_prov->method = msg.wps_config_methods;

			utf8_escape((char *) msg.session_info, buf_len,
				    buf, 2 * buf_len + 1);

			p2p->cfg->p2ps_prov_complete(
				p2p->cfg->cb_ctx, P2P_SC_SUCCESS, sa,
				adv_mac, session_mac, group_mac, adv_id,
				session_id, conncap, passwd_id,
				msg.persistent_ssid, msg.persistent_ssid_len,
				0, 1, buf,
				(const u8 *) &resp_fcap, sizeof(resp_fcap));

			os_free(buf);
		}
	}

	/*
	 * prov_disc_req callback is used to generate P2P-PROV-DISC-ENTER-PIN,
	 * P2P-PROV-DISC-SHOW-PIN, and P2P-PROV-DISC-PBC-REQ events.
	 * Call it either on legacy P2P PD or on P2PS PD only if we need to
	 * enter/show PIN.
	 *
	 * The callback is called in the following cases:
	 * 1. Legacy P2P PD request, response status SUCCESS
	 * 2. P2PS advertiser, method: DISPLAY, autoaccept: TRUE,
	 *    response status: SUCCESS
	 * 3. P2PS advertiser, method  DISPLAY, autoaccept: FALSE,
	 *    response status: INFO_CURRENTLY_UNAVAILABLE
	 * 4. P2PS advertiser, method: KEYPAD, autoaccept==any,
	 *    response status: INFO_CURRENTLY_UNAVAILABLE
	 * 5. P2PS follow-on with SUCCESS_DEFERRED,
	 *    advertiser role: DISPLAY, autoaccept: FALSE,
	 *    seeker: KEYPAD, response status: SUCCESS
	 */
	if (p2p->cfg->prov_disc_req &&
	    ((reject == P2P_SC_SUCCESS && !msg.adv_id) ||
	     (!msg.status &&
	     (reject == P2P_SC_SUCCESS ||
	      reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) &&
	      passwd_id == DEV_PW_USER_SPECIFIED) ||
	     (!msg.status &&
	      reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
	      passwd_id == DEV_PW_REGISTRAR_SPECIFIED) ||
	     (reject == P2P_SC_SUCCESS &&
	      msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
	       passwd_id == DEV_PW_REGISTRAR_SPECIFIED))) {
		const u8 *dev_addr = sa;

		if (msg.p2p_device_addr)
			dev_addr = msg.p2p_device_addr;
		p2p->cfg->prov_disc_req(p2p->cfg->cb_ctx, sa,
					msg.wps_config_methods,
					dev_addr, msg.pri_dev_type,
					msg.device_name, msg.config_methods,
					msg.capability ? msg.capability[0] : 0,
					msg.capability ? msg.capability[1] :
					0,
					msg.group_id, msg.group_id_len);
	}

	if (dev && reject == P2P_SC_SUCCESS) {
		switch (config_methods) {
		case WPS_CONFIG_DISPLAY:
			dev->wps_prov_info = WPS_CONFIG_KEYPAD;
			break;
		case WPS_CONFIG_KEYPAD:
			dev->wps_prov_info = WPS_CONFIG_DISPLAY;
			break;
		case WPS_CONFIG_PUSHBUTTON:
			dev->wps_prov_info = WPS_CONFIG_PUSHBUTTON;
			break;
		case WPS_CONFIG_P2PS:
			dev->wps_prov_info = WPS_CONFIG_P2PS;
			break;
		default:
			dev->wps_prov_info = 0;
			break;
		}

		if (msg.intended_addr)
			os_memcpy(dev->interface_addr, msg.intended_addr,
				  ETH_ALEN);
	}
	p2p_parse_free(&msg);
}