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409 lines
10 KiB
C
409 lines
10 KiB
C
/*
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* wpa_supplicant - Wi-Fi Display
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* Copyright (c) 2011, Atheros Communications, Inc.
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* Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "p2p.h"
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#include "wpa_supplicant_i.h"
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#include "wifi_display.h"
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#define WIFI_DISPLAY_SUBELEM_HEADER_LEN 3
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#ifdef CONFIG_WIFI_DISPLAY
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int wifi_display_init(struct atbmwifi_vif *priv)
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{
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priv->wifi_display = 1;
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return 0;
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}
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void wifi_display_deinit(struct atbmwifi_vif *priv)
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{
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int i;
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for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
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wpabuf_free(priv->wfd_subelem[i]);
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priv->wfd_subelem[i] = NULL;
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}
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}
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struct wpabuf * wifi_display_get_wfd_ie(struct atbmwifi_vif *priv)
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{
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struct wpabuf *ie;
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atbm_size_t len;
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int i;
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if (priv->p2pdata == NULL)
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return NULL;
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len = 0;
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for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
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if (priv->wfd_subelem[i])
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len += wpabuf_len(priv->wfd_subelem[i]);
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}
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ie = wpabuf_alloc(len);
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if (ie == NULL)
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return NULL;
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for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
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if (priv->wfd_subelem[i])
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wpabuf_put_buf(ie, priv->wfd_subelem[i]);
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}
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return ie;
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}
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static int wifi_display_update_wfd_ie(struct atbmwifi_vif *priv)
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{
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struct wpabuf *ie, *buf;
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atbm_size_t len, plen;
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if (priv->p2pdata == NULL)
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return 0;
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wpa_printf(MSG_DEBUG, "WFD: Update WFD IE");
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if (!priv->wifi_display) {
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wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display disabled - do not "
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"include WFD IE");
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p2p_set_wfd_ie_beacon(priv->p2pdata, NULL);
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p2p_set_wfd_ie_probe_req(priv->p2pdata, NULL);
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p2p_set_wfd_ie_probe_resp(priv->p2pdata, NULL);
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p2p_set_wfd_ie_assoc_req(priv->p2pdata, NULL);
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p2p_set_wfd_ie_invitation(priv->p2pdata, NULL);
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p2p_set_wfd_ie_prov_disc_req(priv->p2pdata, NULL);
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p2p_set_wfd_ie_prov_disc_resp(priv->p2pdata, NULL);
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p2p_set_wfd_ie_go_neg(priv->p2pdata, NULL);
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p2p_set_wfd_dev_info(priv->p2pdata, NULL);
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p2p_set_wfd_r2_dev_info(priv->p2pdata, NULL);
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p2p_set_wfd_assoc_bssid(priv->p2pdata, NULL);
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p2p_set_wfd_coupled_sink_info(priv->p2pdata, NULL);
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return 0;
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}
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p2p_set_wfd_dev_info(priv->p2pdata,
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priv->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
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p2p_set_wfd_r2_dev_info(
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priv->p2pdata, priv->wfd_subelem[WFD_SUBELEM_R2_DEVICE_INFO]);
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p2p_set_wfd_assoc_bssid(
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priv->p2pdata,
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priv->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID]);
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p2p_set_wfd_coupled_sink_info(
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priv->p2pdata, priv->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
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/*
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* WFD IE is included in number of management frames. Two different
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* sets of subelements are included depending on the frame:
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*
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* Beacon, (Re)Association Request, GO Negotiation Req/Resp/Conf,
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* Provision Discovery Req:
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* WFD Device Info
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* [Associated BSSID]
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* [Coupled Sink Info]
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*
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* Probe Request:
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* WFD Device Info
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* [Associated BSSID]
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* [Coupled Sink Info]
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* [WFD Extended Capability]
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*
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* Probe Response:
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* WFD Device Info
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* [Associated BSSID]
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* [Coupled Sink Info]
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* [WFD Extended Capability]
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* [WFD Session Info]
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*
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* (Re)Association Response, P2P Invitation Req/Resp,
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* Provision Discovery Resp:
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* WFD Device Info
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* [Associated BSSID]
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* [Coupled Sink Info]
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* [WFD Session Info]
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*/
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len = 0;
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if (priv->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
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len += wpabuf_len(priv->wfd_subelem[
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WFD_SUBELEM_DEVICE_INFO]);
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if (priv->wfd_subelem[WFD_SUBELEM_R2_DEVICE_INFO])
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len += wpabuf_len(priv->wfd_subelem[
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WFD_SUBELEM_R2_DEVICE_INFO]);
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if (priv->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
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len += wpabuf_len(priv->wfd_subelem[
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WFD_SUBELEM_ASSOCIATED_BSSID]);
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if (priv->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
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len += wpabuf_len(priv->wfd_subelem[
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WFD_SUBELEM_COUPLED_SINK]);
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if (priv->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
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len += wpabuf_len(priv->wfd_subelem[
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WFD_SUBELEM_SESSION_INFO]);
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if (priv->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
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len += wpabuf_len(priv->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
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buf = wpabuf_alloc(len);
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if (buf == NULL)
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return -1;
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if (priv->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
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if (priv->wfd_subelem[WFD_SUBELEM_R2_DEVICE_INFO])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_R2_DEVICE_INFO]);
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if (priv->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
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wpabuf_put_buf(buf, priv->wfd_subelem[
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WFD_SUBELEM_ASSOCIATED_BSSID]);
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if (priv->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Beacon", ie);
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p2p_set_wfd_ie_beacon(priv->p2pdata, ie);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for (Re)Association Request",
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ie);
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p2p_set_wfd_ie_assoc_req(priv->p2pdata, ie);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for GO Negotiation", ie);
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p2p_set_wfd_ie_go_neg(priv->p2pdata, ie);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
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"Request", ie);
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p2p_set_wfd_ie_prov_disc_req(priv->p2pdata, ie);
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plen = buf->used;
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if (priv->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Request", ie);
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p2p_set_wfd_ie_probe_req(priv->p2pdata, ie);
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if (priv->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Response", ie);
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p2p_set_wfd_ie_probe_resp(priv->p2pdata, ie);
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/* Remove WFD Extended Capability from buffer */
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buf->used = plen;
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if (priv->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
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wpabuf_put_buf(buf,
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priv->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for P2P Invitation", ie);
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p2p_set_wfd_ie_invitation(priv->p2pdata, ie);
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ie = wifi_display_encaps(buf);
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wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
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"Response", ie);
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p2p_set_wfd_ie_prov_disc_resp(priv->p2pdata, ie);
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wpabuf_free(buf);
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return 0;
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}
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void wifi_display_enable(struct atbmwifi_vif *priv, int enabled)
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{
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wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display %s",
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enabled ? "enabled" : "disabled");
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priv->wifi_display = enabled;
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wifi_display_update_wfd_ie(priv);
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}
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int wifi_display_subelem_set(struct atbmwifi_vif *priv, int subelem, char *val)
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{
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atbm_size_t len;
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struct wpabuf *e;
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if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
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return -1;
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len = val ? strlen(val) : 0;
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if(len & 1)
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return -1;
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len >>= 1;
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if (len == 0) {
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/* Clear subelement */
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e = NULL;
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wpa_printf(MSG_DEBUG, "WFD: Clear subelement %d", subelem);
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} else {
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e = wpabuf_alloc(1 + len);
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if (e == NULL)
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return -1;
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wpabuf_put_u8(e, subelem);
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if (atbmwifi_hexstr2bin(wpabuf_put(e, len), val, len) < 0) {
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wpabuf_free(e);
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return -1;
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}
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wpa_printf(MSG_DEBUG, "WFD: Set subelement %d", subelem);
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}
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wpabuf_free(priv->wfd_subelem[subelem]);
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priv->wfd_subelem[subelem] = e;
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wifi_display_update_wfd_ie(priv);
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return 0;
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}
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int wifi_display_subelem_set_from_ies(struct atbmwifi_vif *priv,
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struct wpabuf *ie)
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{
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int subelements[MAX_WFD_SUBELEMS] = {};
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const atbm_uint8 *pos, *end;
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unsigned int len, subelem;
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struct wpabuf *e;
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wpa_printf(MSG_DEBUG, "WFD IEs set: %p - %lu",
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ie, ie ? (unsigned long) wpabuf_len(ie) : 0);
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if (ie == NULL || wpabuf_len(ie) < 6)
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return -1;
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pos = wpabuf_head(ie);
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end = pos + wpabuf_len(ie);
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while (end > pos) {
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if (pos + 3 > end)
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break;
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len = ATBM_WPA_GET_BE16(pos + 1) + 3;
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wpa_printf(MSG_DEBUG, "WFD Sub-Element ID %d - len %d",
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*pos, len - 3);
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if (len > (unsigned int) (end - pos))
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break;
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subelem = *pos;
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if (subelem < MAX_WFD_SUBELEMS && subelements[subelem] == 0) {
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e = wpabuf_alloc_copy(pos, len);
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if (e == NULL)
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return -1;
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wpabuf_free(priv->wfd_subelem[subelem]);
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priv->wfd_subelem[subelem] = e;
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subelements[subelem] = 1;
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}
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pos += len;
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}
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for (subelem = 0; subelem < MAX_WFD_SUBELEMS; subelem++) {
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if (subelements[subelem] == 0) {
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wpabuf_free(priv->wfd_subelem[subelem]);
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priv->wfd_subelem[subelem] = NULL;
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}
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}
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return wifi_display_update_wfd_ie(priv);
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}
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int wifi_display_subelem_get(struct atbmwifi_vif *priv, char *cmd,
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char *buf, atbm_size_t buflen)
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{
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int subelem;
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if (strcmp(cmd, "all") == 0) {
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struct wpabuf *ie;
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int res;
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ie = wifi_display_get_wfd_ie(priv);
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if (ie == NULL)
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return 0;
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res = atbmwifi_wpa_snprintf_hex(buf, buflen, wpabuf_head(ie),
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wpabuf_len(ie));
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wpabuf_free(ie);
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return res;
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}
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subelem = atoi(cmd);
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if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
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return -1;
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if (priv->wfd_subelem[subelem] == NULL)
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return 0;
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return atbmwifi_wpa_snprintf_hex(buf, buflen,
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wpabuf_head_u8(priv->wfd_subelem[subelem]) +
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1,
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wpabuf_len(priv->wfd_subelem[subelem]) - 1);
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}
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char * wifi_display_subelem_hex(const struct wpabuf *wfd_subelems, atbm_uint8 id)
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{
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char *subelem = NULL;
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const atbm_uint8 *buf;
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atbm_size_t buflen;
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atbm_size_t i = 0;
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atbm_uint16 elen;
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if (!wfd_subelems)
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return NULL;
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buf = wpabuf_head_u8(wfd_subelems);
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if (!buf)
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return NULL;
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buflen = wpabuf_len(wfd_subelems);
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while (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN < buflen) {
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elen = ATBM_WPA_GET_BE16(buf + i + 1);
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if (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN + elen > buflen)
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break; /* truncated subelement */
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if (buf[i] == id) {
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/*
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* Limit explicitly to an arbitrary length to avoid
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* unnecessarily large allocations. In practice, this
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* is limited to maximum frame length anyway, so the
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* maximum memory allocation here is not really that
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* large. Anyway, the Wi-Fi Display subelements that
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* are fetched with this function are even shorter.
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*/
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if (elen > 1000)
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break;
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subelem = atbm_kzalloc(2 * elen + 1, GFP_KERNEL);
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if (!subelem)
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return NULL;
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atbmwifi_wpa_snprintf_hex(subelem, 2 * elen + 1,
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buf + i +
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WIFI_DISPLAY_SUBELEM_HEADER_LEN,
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elen);
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break;
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}
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i += elen + WIFI_DISPLAY_SUBELEM_HEADER_LEN;
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}
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return subelem;
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}
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#endif
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