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hostapd/wpa_supplicant/wifi_display.c
Jouni Malinen bc0ba01d70 WFD: Allow WFD_SUBELEM_SET/GET all to be used with full IE buffer 
This extends the previously used WFD_SUBELEM_SET/GET <subelem id> design
to allow special "all" value to be used as an id to indicate that all
WFD subelements are to be set/get. This uses similar interface as was
previously added over D-Bus.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
2014-12-05 15:22:33 +02:00

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/*
* 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"
#define WIFI_DISPLAY_SUBELEM_HEADER_LEN 3
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;
}
}
struct wpabuf * wifi_display_get_wfd_ie(struct wpa_global *global)
{
struct wpabuf *ie;
size_t len;
int i;
if (global->p2p == NULL)
return NULL;
len = 0;
for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
if (global->wfd_subelem[i])
len += wpabuf_len(global->wfd_subelem[i]);
}
ie = wpabuf_alloc(len);
if (ie == NULL)
return NULL;
for (i = 0; i < MAX_WFD_SUBELEMS; i++) {
if (global->wfd_subelem[i])
wpabuf_put_buf(ie, global->wfd_subelem[i]);
}
return ie;
}
static int wifi_display_update_wfd_ie(struct wpa_global *global)
{
struct wpabuf *ie, *buf;
size_t len, plen;
if (global->p2p == NULL)
return 0;
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';
len = os_strlen(pos);
if (len & 1)
return -1;
len /= 2;
if (os_strcmp(cmd, "all") == 0) {
int res;
e = wpabuf_alloc(len);
if (e == NULL)
return -1;
if (hexstr2bin(pos, wpabuf_put(e, len), len) < 0) {
wpabuf_free(e);
return -1;
}
res = wifi_display_subelem_set_from_ies(global, e);
wpabuf_free(e);
return res;
}
subelem = atoi(cmd);
if (subelem < 0 || subelem >= MAX_WFD_SUBELEMS)
return -1;
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_set_from_ies(struct wpa_global *global,
struct wpabuf *ie)
{
int subelements[MAX_WFD_SUBELEMS] = {};
const u8 *pos, *end;
unsigned int len, subelem;
struct wpabuf *e;
wpa_printf(MSG_DEBUG, "WFD IEs set: %p - %lu",
ie, ie ? (unsigned long) wpabuf_len(ie) : 0);
if (ie == NULL || wpabuf_len(ie) < 6)
return -1;
pos = wpabuf_head(ie);
end = pos + wpabuf_len(ie);
while (end > pos) {
if (pos + 3 > end)
break;
len = WPA_GET_BE16(pos + 1) + 3;
wpa_printf(MSG_DEBUG, "WFD Sub-Element ID %d - len %d",
*pos, len - 3);
if (len > (unsigned int) (end - pos))
break;
subelem = *pos;
if (subelem < MAX_WFD_SUBELEMS && subelements[subelem] == 0) {
e = wpabuf_alloc_copy(pos, len);
if (e == NULL)
return -1;
wpabuf_free(global->wfd_subelem[subelem]);
global->wfd_subelem[subelem] = e;
subelements[subelem] = 1;
}
pos += len;
}
for (subelem = 0; subelem < MAX_WFD_SUBELEMS; subelem++) {
if (subelements[subelem] == 0) {
wpabuf_free(global->wfd_subelem[subelem]);
global->wfd_subelem[subelem] = NULL;
}
}
return wifi_display_update_wfd_ie(global);
}
int wifi_display_subelem_get(struct wpa_global *global, char *cmd,
char *buf, size_t buflen)
{
int subelem;
if (os_strcmp(cmd, "all") == 0) {
struct wpabuf *ie;
int res;
ie = wifi_display_get_wfd_ie(global);
if (ie == NULL)
return 0;
res = wpa_snprintf_hex(buf, buflen, wpabuf_head(ie),
wpabuf_len(ie));
wpabuf_free(ie);
return res;
}
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);
}
char * wifi_display_subelem_hex(const struct wpabuf *wfd_subelems, u8 id)
{
char *subelem = NULL;
const u8 *buf;
size_t buflen;
size_t i = 0;
u16 elen;
if (!wfd_subelems)
return NULL;
buf = wpabuf_head_u8(wfd_subelems);
if (!buf)
return NULL;
buflen = wpabuf_len(wfd_subelems);
while (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN < buflen) {
elen = WPA_GET_BE16(buf + i + 1);
if (i + WIFI_DISPLAY_SUBELEM_HEADER_LEN + elen > buflen)
break; /* truncated subelement */
if (buf[i] == id) {
/*
* Limit explicitly to an arbitrary length to avoid
* unnecessarily large allocations. In practice, this
* is limited to maximum frame length anyway, so the
* maximum memory allocation here is not really that
* large. Anyway, the Wi-Fi Display subelements that
* are fetched with this function are even shorter.
*/
if (elen > 1000)
break;
subelem = os_zalloc(2 * elen + 1);
if (!subelem)
return NULL;
wpa_snprintf_hex(subelem, 2 * elen + 1,
buf + i +
WIFI_DISPLAY_SUBELEM_HEADER_LEN,
elen);
break;
}
i += elen + WIFI_DISPLAY_SUBELEM_HEADER_LEN;
}
return subelem;
}
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