2 * wpa_supplicant - Wi-Fi Display
3 * Copyright (c) 2011, Atheros Communications, Inc.
4 * Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
14 #include "common/ieee802_11_defs.h"
15 #include "wpa_supplicant_i.h"
16 #include "wifi_display.h"
19 #define WIFI_DISPLAY_SUBELEM_HEADER_LEN 3
22 int wifi_display_init(struct wpa_global *global)
24 global->wifi_display = 1;
29 void wifi_display_deinit(struct wpa_global *global)
32 for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
33 wpabuf_free(global->wfd_subelem[i]);
34 global->wfd_subelem[i] = NULL;
39 struct wpabuf * wifi_display_get_wfd_ie(struct wpa_global *global)
45 if (global->p2p == NULL)
49 for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
50 if (global->wfd_subelem[i])
51 len += wpabuf_len(global->wfd_subelem[i]);
54 ie = wpabuf_alloc(len);
58 for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
59 if (global->wfd_subelem[i])
60 wpabuf_put_buf(ie, global->wfd_subelem[i]);
67 static int wifi_display_update_wfd_ie(struct wpa_global *global)
69 struct wpabuf *ie, *buf;
72 if (global->p2p == NULL)
75 wpa_printf(MSG_DEBUG, "WFD: Update WFD IE");
77 if (!global->wifi_display) {
78 wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display disabled - do not "
80 p2p_set_wfd_ie_beacon(global->p2p, NULL);
81 p2p_set_wfd_ie_probe_req(global->p2p, NULL);
82 p2p_set_wfd_ie_probe_resp(global->p2p, NULL);
83 p2p_set_wfd_ie_assoc_req(global->p2p, NULL);
84 p2p_set_wfd_ie_invitation(global->p2p, NULL);
85 p2p_set_wfd_ie_prov_disc_req(global->p2p, NULL);
86 p2p_set_wfd_ie_prov_disc_resp(global->p2p, NULL);
87 p2p_set_wfd_ie_go_neg(global->p2p, NULL);
88 p2p_set_wfd_dev_info(global->p2p, NULL);
89 p2p_set_wfd_assoc_bssid(global->p2p, NULL);
90 p2p_set_wfd_coupled_sink_info(global->p2p, NULL);
94 p2p_set_wfd_dev_info(global->p2p,
95 global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
96 p2p_set_wfd_assoc_bssid(
98 global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID]);
99 p2p_set_wfd_coupled_sink_info(
100 global->p2p, global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
103 * WFD IE is included in number of management frames. Two different
104 * sets of subelements are included depending on the frame:
106 * Beacon, (Re)Association Request, GO Negotiation Req/Resp/Conf,
107 * Provision Discovery Req:
110 * [Coupled Sink Info]
115 * [Coupled Sink Info]
116 * [WFD Extended Capability]
121 * [Coupled Sink Info]
122 * [WFD Extended Capability]
125 * (Re)Association Response, P2P Invitation Req/Resp,
126 * Provision Discovery Resp:
129 * [Coupled Sink Info]
133 if (global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
134 len += wpabuf_len(global->wfd_subelem[
135 WFD_SUBELEM_DEVICE_INFO]);
136 if (global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
137 len += wpabuf_len(global->wfd_subelem[
138 WFD_SUBELEM_ASSOCIATED_BSSID]);
139 if (global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
140 len += wpabuf_len(global->wfd_subelem[
141 WFD_SUBELEM_COUPLED_SINK]);
142 if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
143 len += wpabuf_len(global->wfd_subelem[
144 WFD_SUBELEM_SESSION_INFO]);
145 if (global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
146 len += wpabuf_len(global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
147 buf = wpabuf_alloc(len);
151 if (global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO])
153 global->wfd_subelem[WFD_SUBELEM_DEVICE_INFO]);
154 if (global->wfd_subelem[WFD_SUBELEM_ASSOCIATED_BSSID])
155 wpabuf_put_buf(buf, global->wfd_subelem[
156 WFD_SUBELEM_ASSOCIATED_BSSID]);
157 if (global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK])
159 global->wfd_subelem[WFD_SUBELEM_COUPLED_SINK]);
161 ie = wifi_display_encaps(buf);
162 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Beacon", ie);
163 p2p_set_wfd_ie_beacon(global->p2p, ie);
165 ie = wifi_display_encaps(buf);
166 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for (Re)Association Request",
168 p2p_set_wfd_ie_assoc_req(global->p2p, ie);
170 ie = wifi_display_encaps(buf);
171 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for GO Negotiation", ie);
172 p2p_set_wfd_ie_go_neg(global->p2p, ie);
174 ie = wifi_display_encaps(buf);
175 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
177 p2p_set_wfd_ie_prov_disc_req(global->p2p, ie);
180 if (global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB])
182 global->wfd_subelem[WFD_SUBELEM_EXT_CAPAB]);
184 ie = wifi_display_encaps(buf);
185 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Request", ie);
186 p2p_set_wfd_ie_probe_req(global->p2p, ie);
188 if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
190 global->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
191 ie = wifi_display_encaps(buf);
192 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Probe Response", ie);
193 p2p_set_wfd_ie_probe_resp(global->p2p, ie);
195 /* Remove WFD Extended Capability from buffer */
197 if (global->wfd_subelem[WFD_SUBELEM_SESSION_INFO])
199 global->wfd_subelem[WFD_SUBELEM_SESSION_INFO]);
201 ie = wifi_display_encaps(buf);
202 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for P2P Invitation", ie);
203 p2p_set_wfd_ie_invitation(global->p2p, ie);
205 ie = wifi_display_encaps(buf);
206 wpa_hexdump_buf(MSG_DEBUG, "WFD: WFD IE for Provision Discovery "
208 p2p_set_wfd_ie_prov_disc_resp(global->p2p, ie);
216 void wifi_display_enable(struct wpa_global *global, int enabled)
218 wpa_printf(MSG_DEBUG, "WFD: Wi-Fi Display %s",
219 enabled ? "enabled" : "disabled");
220 global->wifi_display = enabled;
221 wifi_display_update_wfd_ie(global);
225 int wifi_display_subelem_set(struct wpa_global *global, char *cmd)
232 pos = os_strchr(cmd, ' ');
237 len = os_strlen(pos);
242 if (os_strcmp(cmd, "all") == 0) {
245 e = wpabuf_alloc(len);
248 if (hexstr2bin(pos, wpabuf_put(e, len), len) < 0) {
252 res = wifi_display_subelem_set_from_ies(global, e);
258 if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
262 /* Clear subelement */
264 wpa_printf(MSG_DEBUG, "WFD: Clear subelement %d", subelem);
266 e = wpabuf_alloc(1 + len);
269 wpabuf_put_u8(e, subelem);
270 if (hexstr2bin(pos, wpabuf_put(e, len), len) < 0) {
274 wpa_printf(MSG_DEBUG, "WFD: Set subelement %d", subelem);
277 wpabuf_free(global->wfd_subelem[subelem]);
278 global->wfd_subelem[subelem] = e;
279 wifi_display_update_wfd_ie(global);
285 int wifi_display_subelem_set_from_ies(struct wpa_global *global,
288 int subelements[MAX_WFD_SUBELEMS] = {};
290 unsigned int len, subelem;
293 wpa_printf(MSG_DEBUG, "WFD IEs set: %p - %lu",
294 ie, ie ? (unsigned long) wpabuf_len(ie) : 0);
296 if (ie == NULL || wpabuf_len(ie) < 6)
299 pos = wpabuf_head(ie);
300 end = pos + wpabuf_len(ie);
306 len = WPA_GET_BE16(pos + 1) + 3;
308 wpa_printf(MSG_DEBUG, "WFD Sub-Element ID %d - len %d",
311 if (len > (unsigned int) (end - pos))
315 if (subelem < MAX_WFD_SUBELEMS && subelements[subelem] == 0) {
316 e = wpabuf_alloc_copy(pos, len);
320 wpabuf_free(global->wfd_subelem[subelem]);
321 global->wfd_subelem[subelem] = e;
322 subelements[subelem] = 1;
328 for (subelem = 0; subelem < MAX_WFD_SUBELEMS; subelem++) {
329 if (subelements[subelem] == 0) {
330 wpabuf_free(global->wfd_subelem[subelem]);
331 global->wfd_subelem[subelem] = NULL;
335 return wifi_display_update_wfd_ie(global);
339 int wifi_display_subelem_get(struct wpa_global *global, char *cmd,
340 char *buf, size_t buflen)
344 if (os_strcmp(cmd, "all") == 0) {
348 ie = wifi_display_get_wfd_ie(global);
351 res = wpa_snprintf_hex(buf, buflen, wpabuf_head(ie),
358 if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
361 if (global->wfd_subelem[subelem] == NULL)
364 return wpa_snprintf_hex(buf, buflen,
365 wpabuf_head_u8(global->wfd_subelem[subelem]) +
367 wpabuf_len(global->wfd_subelem[subelem]) - 1);
371 char * wifi_display_subelem_hex(const struct wpabuf *wfd_subelems, u8 id)
373 char *subelem = NULL;
382 buf = wpabuf_head_u8(wfd_subelems);
386 buflen = wpabuf_len(wfd_subelems);
388 while (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN < buflen) {
389 elen = WPA_GET_BE16(buf + i + 1);
390 if (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN + elen > buflen)
391 break; /* truncated subelement */
395 * Limit explicitly to an arbitrary length to avoid
396 * unnecessarily large allocations. In practice, this
397 * is limited to maximum frame length anyway, so the
398 * maximum memory allocation here is not really that
399 * large. Anyway, the Wi-Fi Display subelements that
400 * are fetched with this function are even shorter.
404 subelem = os_zalloc(2 * elen + 1);
407 wpa_snprintf_hex(subelem, 2 * elen + 1,
409 WIFI_DISPLAY_SUBELEM_HEADER_LEN,
414 i += elen + WIFI_DISPLAY_SUBELEM_HEADER_LEN;