WFD: Add Wi-Fi Display support

This commit adds control interface commands and internal storage of
Wi-Fi Display related configuration. In addition, WFD IE is now added
to various P2P frames, Probe Request/Response, and (Re)Association
Request/Response frames. WFD subelements from peers are stored in the
P2P peer table.

Following control interface commands are now available:
SET wifi_display <0/1>
GET wifi_display
WFD_SUBELEM_SET <subelem> [hexdump of length+body]
WFD_SUBELEM_GET <subelem>

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
[vishalm@ti.com: Backported it to curent tree]
Signed-off-by: Vishal Mahaveer <vishalm@ti.com>

Change-Id: Ief0cd61903facd9209927d9dc84c8f093f3b6bac

1 files changed, 251 insertions, 0 deletions

diff --git a/wpa_supplicant/wifi_display.c b/wpa_supplicant/wifi_display.c
new file mode 100644
index 0000000..92ca536
--- /dev/null
+++ b/wpa_supplicant/wifi_display.c
@@ -0,0 +1,251 @@
+/*
+ * wpa_supplicant - Wi-Fi Display
+ * Copyright (c) 2011, Atheros Communications, Inc.
+ * Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "p2p/p2p.h"
+#include "common/ieee802_11_defs.h"
+#include "wpa_supplicant_i.h"
+#include "wifi_display.h"
+
+
+int wifi_display_init(struct wpa_global *global)
+{
+	global->wifi_display = 1;
+	return 0;
+}
+
+
+void wifi_display_deinit(struct wpa_global *global)
+{
+	int i;
+	for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
+		wpabuf_free(global->wfd_subelem[i]);
+		global->wfd_subelem[i] = NULL;
+	}
+}
+
+
+static int wifi_display_update_wfd_ie(struct wpa_global *global)
+{
+	struct wpabuf *ie, *buf;
+	size_t len, plen;
+
+	wpa_printf(MSG_DEBUG, "WFD: Update WFD IE");
+
+	if (!global->wifi_display) {
+		wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display disabled - do not "
+			   "include WFD IE");
+		p2p_set_wfd_ie_beacon(global->p2p, NULL);
+		p2p_set_wfd_ie_probe_req(global->p2p, NULL);
+		p2p_set_wfd_ie_probe_resp(global->p2p, NULL);
+		p2p_set_wfd_ie_assoc_req(global->p2p, NULL);
+		p2p_set_wfd_ie_invitation(global->p2p, NULL);
+		p2p_set_wfd_ie_prov_disc_req(global->p2p, NULL);
+		p2p_set_wfd_ie_prov_disc_resp(global->p2p, NULL);
+		p2p_set_wfd_ie_go_neg(global->p2p, NULL);
+		p2p_set_wfd_dev_info(global->p2p, NULL);
+		p2p_set_wfd_assoc_bssid(global->p2p, NULL);
+		p2p_set_wfd_coupled_sink_info(global->p2p, NULL);
+		return 0;
+	}
+
+	p2p_set_wfd_dev_info(global->p2p,
+			     global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
+	p2p_set_wfd_assoc_bssid(
+		global->p2p,
+		global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID]);
+	p2p_set_wfd_coupled_sink_info(
+		global->p2p, global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
+
+	/*
+	 * WFD IE is included in number of management frames. Two different
+	 * sets of subelements are included depending on the frame:
+	 *
+	 * Beacon, (Re)Association Request, GO Negotiation Req/Resp/Conf,
+	 * Provision Discovery Req:
+	 * WFD Device Info
+	 * [Associated BSSID]
+	 * [Coupled Sink Info]
+	 *
+	 * Probe Request:
+	 * WFD Device Info
+	 * [Associated BSSID]
+	 * [Coupled Sink Info]
+	 * [WFD Extended Capability]
+	 *
+	 * Probe Response:
+	 * WFD Device Info
+	 * [Associated BSSID]
+	 * [Coupled Sink Info]
+	 * [WFD Extended Capability]
+	 * [WFD Session Info]
+	 *
+	 * (Re)Association Response, P2P Invitation Req/Resp,
+	 * Provision Discovery Resp:
+	 * WFD Device Info
+	 * [Associated BSSID]
+	 * [Coupled Sink Info]
+	 * [WFD Session Info]
+	 */
+	len = 0;
+	if (global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
+		len += wpabuf_len(global->wfd_subelem[
+					  WFD_SUBELEM_DEVICE_INFO]);
+	if (global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
+		len += wpabuf_len(global->wfd_subelem[
+					  WFD_SUBELEM_ASSOCIATED_BSSID]);
+	if (global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
+		len += wpabuf_len(global->wfd_subelem[
+					  WFD_SUBELEM_COUPLED_SINK]);
+	if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
+		len += wpabuf_len(global->wfd_subelem[
+					  WFD_SUBELEM_SESSION_INFO]);
+	if (global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
+		len += wpabuf_len(global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
+	buf = wpabuf_alloc(len);
+	if (buf == NULL)
+		return -1;
+
+	if (global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
+		wpabuf_put_buf(buf,
+			       global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
+	if (global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
+		wpabuf_put_buf(buf, global->wfd_subelem[
+				       WFD_SUBELEM_ASSOCIATED_BSSID]);
+	if (global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
+		wpabuf_put_buf(buf,
+			       global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Beacon", ie);
+	p2p_set_wfd_ie_beacon(global->p2p, ie);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for (Re)Association Request",
+			ie);
+	p2p_set_wfd_ie_assoc_req(global->p2p, ie);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for GO Negotiation", ie);
+	p2p_set_wfd_ie_go_neg(global->p2p, ie);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
+			"Request", ie);
+	p2p_set_wfd_ie_prov_disc_req(global->p2p, ie);
+
+	plen = buf->used;
+	if (global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
+		wpabuf_put_buf(buf,
+			       global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Request", ie);
+	p2p_set_wfd_ie_probe_req(global->p2p, ie);
+
+	if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
+		wpabuf_put_buf(buf,
+			       global->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Response", ie);
+	p2p_set_wfd_ie_probe_resp(global->p2p, ie);
+
+	/* Remove WFD Extended Capability from buffer */
+	buf->used = plen;
+	if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
+		wpabuf_put_buf(buf,
+			       global->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for P2P Invitation", ie);
+	p2p_set_wfd_ie_invitation(global->p2p, ie);
+
+	ie = wifi_display_encaps(buf);
+	wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
+			"Response", ie);
+	p2p_set_wfd_ie_prov_disc_resp(global->p2p, ie);
+
+	wpabuf_free(buf);
+
+	return 0;
+}
+
+
+void wifi_display_enable(struct wpa_global *global, int enabled)
+{
+	wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display %s",
+		   enabled ? "enabled" : "disabled");
+	global->wifi_display = enabled;
+	wifi_display_update_wfd_ie(global);
+}
+
+
+int wifi_display_subelem_set(struct wpa_global *global, char *cmd)
+{
+	char *pos;
+	int subelem;
+	size_t len;
+	struct wpabuf *e;
+
+	pos = os_strchr(cmd, ' ');
+	if (pos == NULL)
+		return -1;
+	*pos++ = '\0';
+	subelem = atoi(cmd);
+	if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
+		return -1;
+
+	len = os_strlen(pos);
+	if (len & 1)
+		return -1;
+	len /= 2;
+
+	if (len == 0) {
+		/* Clear subelement */
+		e = NULL;
+		wpa_printf(MSG_DEBUG, "WFD: Clear subelement %d", subelem);
+	} else {
+		e = wpabuf_alloc(1 + len);
+		if (e == NULL)
+			return -1;
+		wpabuf_put_u8(e, subelem);
+		if (hexstr2bin(pos, wpabuf_put(e, len), len) < 0) {
+			wpabuf_free(e);
+			return -1;
+		}
+		wpa_printf(MSG_DEBUG, "WFD: Set subelement %d", subelem);
+	}
+
+	wpabuf_free(global->wfd_subelem[subelem]);
+	global->wfd_subelem[subelem] = e;
+	wifi_display_update_wfd_ie(global);
+
+	return 0;
+}
+
+
+int wifi_display_subelem_get(struct wpa_global *global, char *cmd,
+			     char *buf, size_t buflen)
+{
+	int subelem;
+
+	subelem = atoi(cmd);
+	if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
+		return -1;
+
+	if (global->wfd_subelem[subelem] == NULL)
+		return 0;
+
+	return wpa_snprintf_hex(buf, buflen,
+				wpabuf_head_u8(global->wfd_subelem[subelem]) +
+				1,
+				wpabuf_len(global->wfd_subelem[subelem]) - 1);
+}